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review.trustedfirmware.org / mirror / mbed-tls / refs/heads/2.28-sphinx-versioned-documentation / . / library / ssl_tls.c
blob: 494de1b93e16abfa808b97e9376bb98157c0abdd [file] [log] [blame]
/*
* SSLv3/TLSv1 shared functions
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* The SSL 3.0 specification was drafted by Netscape in 1996,
* and became an IETF standard in 1999.
*
* http://wp.netscape.com/eng/ssl3/
* http://www.ietf.org/rfc/rfc2246.txt
* http://www.ietf.org/rfc/rfc4346.txt
*/
#include "common.h"
#if defined(MBEDTLS_SSL_TLS_C)
#include "mbedtls/platform.h"
#include "mbedtls/ssl.h"
#include "mbedtls/ssl_internal.h"
#include "mbedtls/debug.h"
#include "mbedtls/error.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/version.h"
#include "mbedtls/constant_time.h"
#include <string.h>
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "mbedtls/psa_util.h"
#include "psa/crypto.h"
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#include "mbedtls/oid.h"
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
/* Top-level Connection ID API */
int mbedtls_ssl_conf_cid(mbedtls_ssl_config *conf,
size_t len,
int ignore_other_cid)
{
if (len > MBEDTLS_SSL_CID_IN_LEN_MAX) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_FAIL &&
ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_IGNORE) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
conf->ignore_unexpected_cid = ignore_other_cid;
conf->cid_len = len;
return 0;
}
int mbedtls_ssl_set_cid(mbedtls_ssl_context *ssl,
int enable,
unsigned char const *own_cid,
size_t own_cid_len)
{
if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl->negotiate_cid = enable;
if (enable == MBEDTLS_SSL_CID_DISABLED) {
MBEDTLS_SSL_DEBUG_MSG(3, ("Disable use of CID extension."));
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(3, ("Enable use of CID extension."));
MBEDTLS_SSL_DEBUG_BUF(3, "Own CID", own_cid, own_cid_len);
if (own_cid_len != ssl->conf->cid_len) {
MBEDTLS_SSL_DEBUG_MSG(3, ("CID length %u does not match CID length %u in config",
(unsigned) own_cid_len,
(unsigned) ssl->conf->cid_len));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
memcpy(ssl->own_cid, own_cid, own_cid_len);
/* Truncation is not an issue here because
* MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */
ssl->own_cid_len = (uint8_t) own_cid_len;
return 0;
}
int mbedtls_ssl_get_peer_cid(mbedtls_ssl_context *ssl,
int *enabled,
unsigned char peer_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX],
size_t *peer_cid_len)
{
*enabled = MBEDTLS_SSL_CID_DISABLED;
if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* We report MBEDTLS_SSL_CID_DISABLED in case the CID extensions
* were used, but client and server requested the empty CID.
* This is indistinguishable from not using the CID extension
* in the first place. */
if (ssl->transform_in->in_cid_len == 0 &&
ssl->transform_in->out_cid_len == 0) {
return 0;
}
if (peer_cid_len != NULL) {
*peer_cid_len = ssl->transform_in->out_cid_len;
if (peer_cid != NULL) {
memcpy(peer_cid, ssl->transform_in->out_cid,
ssl->transform_in->out_cid_len);
}
}
*enabled = MBEDTLS_SSL_CID_ENABLED;
return 0;
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
/*
* Convert max_fragment_length codes to length.
* RFC 6066 says:
* enum{
* 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
* } MaxFragmentLength;
* and we add 0 -> extension unused
*/
static unsigned int ssl_mfl_code_to_length(int mfl)
{
switch (mfl) {
case MBEDTLS_SSL_MAX_FRAG_LEN_NONE:
return MBEDTLS_TLS_EXT_ADV_CONTENT_LEN;
case MBEDTLS_SSL_MAX_FRAG_LEN_512:
return 512;
case MBEDTLS_SSL_MAX_FRAG_LEN_1024:
return 1024;
case MBEDTLS_SSL_MAX_FRAG_LEN_2048:
return 2048;
case MBEDTLS_SSL_MAX_FRAG_LEN_4096:
return 4096;
default:
return MBEDTLS_TLS_EXT_ADV_CONTENT_LEN;
}
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
int mbedtls_ssl_session_copy(mbedtls_ssl_session *dst,
const mbedtls_ssl_session *src)
{
mbedtls_ssl_session_free(dst);
memcpy(dst, src, sizeof(mbedtls_ssl_session));
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
dst->ticket = NULL;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if (src->peer_cert != NULL) {
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
dst->peer_cert = mbedtls_calloc(1, sizeof(mbedtls_x509_crt));
if (dst->peer_cert == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
mbedtls_x509_crt_init(dst->peer_cert);
if ((ret = mbedtls_x509_crt_parse_der(dst->peer_cert, src->peer_cert->raw.p,
src->peer_cert->raw.len)) != 0) {
mbedtls_free(dst->peer_cert);
dst->peer_cert = NULL;
return ret;
}
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
if (src->peer_cert_digest != NULL) {
dst->peer_cert_digest =
mbedtls_calloc(1, src->peer_cert_digest_len);
if (dst->peer_cert_digest == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
memcpy(dst->peer_cert_digest, src->peer_cert_digest,
src->peer_cert_digest_len);
dst->peer_cert_digest_type = src->peer_cert_digest_type;
dst->peer_cert_digest_len = src->peer_cert_digest_len;
}
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
if (src->ticket != NULL) {
dst->ticket = mbedtls_calloc(1, src->ticket_len);
if (dst->ticket == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
memcpy(dst->ticket, src->ticket, src->ticket_len);
}
#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
return 0;
}
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
MBEDTLS_CHECK_RETURN_CRITICAL
static int resize_buffer(unsigned char **buffer, size_t len_new, size_t *len_old)
{
unsigned char *resized_buffer = mbedtls_calloc(1, len_new);
if (resized_buffer == NULL) {
return -1;
}
/* We want to copy len_new bytes when downsizing the buffer, and
* len_old bytes when upsizing, so we choose the smaller of two sizes,
* to fit one buffer into another. Size checks, ensuring that no data is
* lost, are done outside of this function. */
memcpy(resized_buffer, *buffer,
(len_new < *len_old) ? len_new : *len_old);
mbedtls_platform_zeroize(*buffer, *len_old);
mbedtls_free(*buffer);
*buffer = resized_buffer;
*len_old = len_new;
return 0;
}
static void handle_buffer_resizing(mbedtls_ssl_context *ssl, int downsizing,
size_t in_buf_new_len,
size_t out_buf_new_len)
{
int modified = 0;
size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;
size_t written_out = 0, iv_offset_out = 0, len_offset_out = 0;
if (ssl->in_buf != NULL) {
written_in = ssl->in_msg - ssl->in_buf;
iv_offset_in = ssl->in_iv - ssl->in_buf;
len_offset_in = ssl->in_len - ssl->in_buf;
if (downsizing ?
ssl->in_buf_len > in_buf_new_len && ssl->in_left < in_buf_new_len :
ssl->in_buf_len < in_buf_new_len) {
if (resize_buffer(&ssl->in_buf, in_buf_new_len, &ssl->in_buf_len) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("input buffer resizing failed - out of memory"));
} else {
MBEDTLS_SSL_DEBUG_MSG(2, ("Reallocating in_buf to %" MBEDTLS_PRINTF_SIZET,
in_buf_new_len));
modified = 1;
}
}
}
if (ssl->out_buf != NULL) {
written_out = ssl->out_msg - ssl->out_buf;
iv_offset_out = ssl->out_iv - ssl->out_buf;
len_offset_out = ssl->out_len - ssl->out_buf;
if (downsizing ?
ssl->out_buf_len > out_buf_new_len && ssl->out_left < out_buf_new_len :
ssl->out_buf_len < out_buf_new_len) {
if (resize_buffer(&ssl->out_buf, out_buf_new_len, &ssl->out_buf_len) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("output buffer resizing failed - out of memory"));
} else {
MBEDTLS_SSL_DEBUG_MSG(2, ("Reallocating out_buf to %" MBEDTLS_PRINTF_SIZET,
out_buf_new_len));
modified = 1;
}
}
}
if (modified) {
/* Update pointers here to avoid doing it twice. */
mbedtls_ssl_reset_in_out_pointers(ssl);
/* Fields below might not be properly updated with record
* splitting or with CID, so they are manually updated here. */
ssl->out_msg = ssl->out_buf + written_out;
ssl->out_len = ssl->out_buf + len_offset_out;
ssl->out_iv = ssl->out_buf + iv_offset_out;
ssl->in_msg = ssl->in_buf + written_in;
ssl->in_len = ssl->in_buf + len_offset_in;
ssl->in_iv = ssl->in_buf + iv_offset_in;
}
}
#endif /* MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH */
/*
* Key material generation
*/
#if defined(MBEDTLS_SSL_PROTO_SSL3)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl3_prf(const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen)
{
int ret = 0;
size_t i;
mbedtls_md5_context md5;
mbedtls_sha1_context sha1;
unsigned char padding[16];
unsigned char sha1sum[20];
((void) label);
mbedtls_md5_init(&md5);
mbedtls_sha1_init(&sha1);
/*
* SSLv3:
* block =
* MD5( secret + SHA1( 'A' + secret + random ) ) +
* MD5( secret + SHA1( 'BB' + secret + random ) ) +
* MD5( secret + SHA1( 'CCC' + secret + random ) ) +
* ...
*/
for (i = 0; i < dlen / 16; i++) {
memset(padding, (unsigned char) ('A' + i), 1 + i);
if ((ret = mbedtls_sha1_starts_ret(&sha1)) != 0) {
goto exit;
}
if ((ret = mbedtls_sha1_update_ret(&sha1, padding, 1 + i)) != 0) {
goto exit;
}
if ((ret = mbedtls_sha1_update_ret(&sha1, secret, slen)) != 0) {
goto exit;
}
if ((ret = mbedtls_sha1_update_ret(&sha1, random, rlen)) != 0) {
goto exit;
}
if ((ret = mbedtls_sha1_finish_ret(&sha1, sha1sum)) != 0) {
goto exit;
}
if ((ret = mbedtls_md5_starts_ret(&md5)) != 0) {
goto exit;
}
if ((ret = mbedtls_md5_update_ret(&md5, secret, slen)) != 0) {
goto exit;
}
if ((ret = mbedtls_md5_update_ret(&md5, sha1sum, 20)) != 0) {
goto exit;
}
if ((ret = mbedtls_md5_finish_ret(&md5, dstbuf + i * 16)) != 0) {
goto exit;
}
}
exit:
mbedtls_md5_free(&md5);
mbedtls_sha1_free(&sha1);
mbedtls_platform_zeroize(padding, sizeof(padding));
mbedtls_platform_zeroize(sha1sum, sizeof(sha1sum));
return ret;
}
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
MBEDTLS_CHECK_RETURN_CRITICAL
static int tls1_prf(const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen)
{
size_t nb, hs;
size_t i, j, k;
const unsigned char *S1, *S2;
unsigned char *tmp;
size_t tmp_len = 0;
unsigned char h_i[20];
const mbedtls_md_info_t *md_info;
mbedtls_md_context_t md_ctx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_md_init(&md_ctx);
tmp_len = 20 + strlen(label) + rlen;
tmp = mbedtls_calloc(1, tmp_len);
if (tmp == NULL) {
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
hs = (slen + 1) / 2;
S1 = secret;
S2 = secret + slen - hs;
nb = strlen(label);
memcpy(tmp + 20, label, nb);
memcpy(tmp + 20 + nb, random, rlen);
nb += rlen;
/*
* First compute P_md5(secret,label+random)[0..dlen]
*/
if ((md_info = mbedtls_md_info_from_type(MBEDTLS_MD_MD5)) == NULL) {
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto exit;
}
if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) {
goto exit;
}
ret = mbedtls_md_hmac_starts(&md_ctx, S1, hs);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, tmp + 20, nb);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, 4 + tmp);
if (ret != 0) {
goto exit;
}
for (i = 0; i < dlen; i += 16) {
ret = mbedtls_md_hmac_reset(&md_ctx);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, 4 + tmp, 16 + nb);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, h_i);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_reset(&md_ctx);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, 4 + tmp, 16);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, 4 + tmp);
if (ret != 0) {
goto exit;
}
k = (i + 16 > dlen) ? dlen % 16 : 16;
for (j = 0; j < k; j++) {
dstbuf[i + j] = h_i[j];
}
}
mbedtls_md_free(&md_ctx);
/*
* XOR out with P_sha1(secret,label+random)[0..dlen]
*/
if ((md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1)) == NULL) {
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto exit;
}
if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) {
goto exit;
}
ret = mbedtls_md_hmac_starts(&md_ctx, S2, hs);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, tmp + 20, nb);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, tmp);
if (ret != 0) {
goto exit;
}
for (i = 0; i < dlen; i += 20) {
ret = mbedtls_md_hmac_reset(&md_ctx);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, tmp, 20 + nb);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, h_i);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_reset(&md_ctx);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, tmp, 20);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, tmp);
if (ret != 0) {
goto exit;
}
k = (i + 20 > dlen) ? dlen % 20 : 20;
for (j = 0; j < k; j++) {
dstbuf[i + j] = (unsigned char) (dstbuf[i + j] ^ h_i[j]);
}
}
exit:
mbedtls_md_free(&md_ctx);
mbedtls_platform_zeroize(tmp, tmp_len);
mbedtls_platform_zeroize(h_i, sizeof(h_i));
mbedtls_free(tmp);
return ret;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
static psa_status_t setup_psa_key_derivation(psa_key_derivation_operation_t *derivation,
psa_key_id_t key,
psa_algorithm_t alg,
const unsigned char *seed, size_t seed_length,
const unsigned char *label, size_t label_length,
size_t capacity)
{
psa_status_t status;
status = psa_key_derivation_setup(derivation, alg);
if (status != PSA_SUCCESS) {
return status;
}
if (PSA_ALG_IS_TLS12_PRF(alg) || PSA_ALG_IS_TLS12_PSK_TO_MS(alg)) {
status = psa_key_derivation_input_bytes(derivation,
PSA_KEY_DERIVATION_INPUT_SEED,
seed, seed_length);
if (status != PSA_SUCCESS) {
return status;
}
if (mbedtls_svc_key_id_is_null(key)) {
status = psa_key_derivation_input_bytes(
derivation, PSA_KEY_DERIVATION_INPUT_SECRET,
NULL, 0);
} else {
status = psa_key_derivation_input_key(
derivation, PSA_KEY_DERIVATION_INPUT_SECRET, key);
}
if (status != PSA_SUCCESS) {
return status;
}
status = psa_key_derivation_input_bytes(derivation,
PSA_KEY_DERIVATION_INPUT_LABEL,
label, label_length);
if (status != PSA_SUCCESS) {
return status;
}
} else {
return PSA_ERROR_NOT_SUPPORTED;
}
status = psa_key_derivation_set_capacity(derivation, capacity);
if (status != PSA_SUCCESS) {
return status;
}
return PSA_SUCCESS;
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int tls_prf_generic(mbedtls_md_type_t md_type,
const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen)
{
psa_status_t status;
psa_algorithm_t alg;
psa_key_id_t master_key = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_derivation_operation_t derivation =
PSA_KEY_DERIVATION_OPERATION_INIT;
if (md_type == MBEDTLS_MD_SHA384) {
alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_384);
} else {
alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256);
}
/* Normally a "secret" should be long enough to be impossible to
* find by brute force, and in particular should not be empty. But
* this PRF is also used to derive an IV, in particular in EAP-TLS,
* and for this use case it makes sense to have a 0-length "secret".
* Since the key API doesn't allow importing a key of length 0,
* keep master_key=0, which setup_psa_key_derivation() understands
* to mean a 0-length "secret" input. */
if (slen != 0) {
psa_key_attributes_t key_attributes = psa_key_attributes_init();
psa_set_key_usage_flags(&key_attributes, PSA_KEY_USAGE_DERIVE);
psa_set_key_algorithm(&key_attributes, alg);
psa_set_key_type(&key_attributes, PSA_KEY_TYPE_DERIVE);
status = psa_import_key(&key_attributes, secret, slen, &master_key);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
}
status = setup_psa_key_derivation(&derivation,
master_key, alg,
random, rlen,
(unsigned char const *) label,
(size_t) strlen(label),
dlen);
if (status != PSA_SUCCESS) {
psa_key_derivation_abort(&derivation);
psa_destroy_key(master_key);
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
status = psa_key_derivation_output_bytes(&derivation, dstbuf, dlen);
if (status != PSA_SUCCESS) {
psa_key_derivation_abort(&derivation);
psa_destroy_key(master_key);
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
status = psa_key_derivation_abort(&derivation);
if (status != PSA_SUCCESS) {
psa_destroy_key(master_key);
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
if (!mbedtls_svc_key_id_is_null(master_key)) {
status = psa_destroy_key(master_key);
}
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
return 0;
}
#else /* MBEDTLS_USE_PSA_CRYPTO */
MBEDTLS_CHECK_RETURN_CRITICAL
static int tls_prf_generic(mbedtls_md_type_t md_type,
const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen)
{
size_t nb;
size_t i, j, k, md_len;
unsigned char *tmp;
size_t tmp_len = 0;
unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
const mbedtls_md_info_t *md_info;
mbedtls_md_context_t md_ctx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_md_init(&md_ctx);
if ((md_info = mbedtls_md_info_from_type(md_type)) == NULL) {
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
md_len = mbedtls_md_get_size(md_info);
tmp_len = md_len + strlen(label) + rlen;
tmp = mbedtls_calloc(1, tmp_len);
if (tmp == NULL) {
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
nb = strlen(label);
memcpy(tmp + md_len, label, nb);
memcpy(tmp + md_len + nb, random, rlen);
nb += rlen;
/*
* Compute P_<hash>(secret, label + random)[0..dlen]
*/
if ((ret = mbedtls_md_setup(&md_ctx, md_info, 1)) != 0) {
goto exit;
}
ret = mbedtls_md_hmac_starts(&md_ctx, secret, slen);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, tmp + md_len, nb);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, tmp);
if (ret != 0) {
goto exit;
}
for (i = 0; i < dlen; i += md_len) {
ret = mbedtls_md_hmac_reset(&md_ctx);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, tmp, md_len + nb);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, h_i);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_reset(&md_ctx);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_update(&md_ctx, tmp, md_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_md_hmac_finish(&md_ctx, tmp);
if (ret != 0) {
goto exit;
}
k = (i + md_len > dlen) ? dlen % md_len : md_len;
for (j = 0; j < k; j++) {
dstbuf[i + j] = h_i[j];
}
}
exit:
mbedtls_md_free(&md_ctx);
if (tmp != NULL) {
mbedtls_platform_zeroize(tmp, tmp_len);
}
mbedtls_platform_zeroize(h_i, sizeof(h_i));
mbedtls_free(tmp);
return ret;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_SHA256_C)
MBEDTLS_CHECK_RETURN_CRITICAL
static int tls_prf_sha256(const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen)
{
return tls_prf_generic(MBEDTLS_MD_SHA256, secret, slen,
label, random, rlen, dstbuf, dlen);
}
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
MBEDTLS_CHECK_RETURN_CRITICAL
static int tls_prf_sha384(const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen)
{
return tls_prf_generic(MBEDTLS_MD_SHA384, secret, slen,
label, random, rlen, dstbuf, dlen);
}
#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
static void ssl_update_checksum_start(mbedtls_ssl_context *, const unsigned char *, size_t);
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
static void ssl_update_checksum_md5sha1(mbedtls_ssl_context *, const unsigned char *, size_t);
#endif
#if defined(MBEDTLS_SSL_PROTO_SSL3)
static void ssl_calc_verify_ssl(const mbedtls_ssl_context *, unsigned char *, size_t *);
static void ssl_calc_finished_ssl(mbedtls_ssl_context *, unsigned char *, int);
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
static void ssl_calc_verify_tls(const mbedtls_ssl_context *, unsigned char *, size_t *);
static void ssl_calc_finished_tls(mbedtls_ssl_context *, unsigned char *, int);
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
static void ssl_update_checksum_sha256(mbedtls_ssl_context *, const unsigned char *, size_t);
static void ssl_calc_verify_tls_sha256(const mbedtls_ssl_context *, unsigned char *, size_t *);
static void ssl_calc_finished_tls_sha256(mbedtls_ssl_context *, unsigned char *, int);
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
static void ssl_update_checksum_sha384(mbedtls_ssl_context *, const unsigned char *, size_t);
static void ssl_calc_verify_tls_sha384(const mbedtls_ssl_context *, unsigned char *, size_t *);
static void ssl_calc_finished_tls_sha384(mbedtls_ssl_context *, unsigned char *, int);
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) && \
defined(MBEDTLS_USE_PSA_CRYPTO)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_use_opaque_psk(mbedtls_ssl_context const *ssl)
{
if (ssl->conf->f_psk != NULL) {
/* If we've used a callback to select the PSK,
* the static configuration is irrelevant. */
if (!mbedtls_svc_key_id_is_null(ssl->handshake->psk_opaque)) {
return 1;
}
return 0;
}
if (!mbedtls_svc_key_id_is_null(ssl->conf->psk_opaque)) {
return 1;
}
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO &&
MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
static mbedtls_tls_prf_types tls_prf_get_type(mbedtls_ssl_tls_prf_cb *tls_prf)
{
#if defined(MBEDTLS_SSL_PROTO_SSL3)
if (tls_prf == ssl3_prf) {
return MBEDTLS_SSL_TLS_PRF_SSL3;
} else
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
if (tls_prf == tls1_prf) {
return MBEDTLS_SSL_TLS_PRF_TLS1;
} else
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
if (tls_prf == tls_prf_sha384) {
return MBEDTLS_SSL_TLS_PRF_SHA384;
} else
#endif
#if defined(MBEDTLS_SHA256_C)
if (tls_prf == tls_prf_sha256) {
return MBEDTLS_SSL_TLS_PRF_SHA256;
} else
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
return MBEDTLS_SSL_TLS_PRF_NONE;
}
#endif /* MBEDTLS_SSL_EXPORT_KEYS */
int mbedtls_ssl_tls_prf(const mbedtls_tls_prf_types prf,
const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen)
{
mbedtls_ssl_tls_prf_cb *tls_prf = NULL;
switch (prf) {
#if defined(MBEDTLS_SSL_PROTO_SSL3)
case MBEDTLS_SSL_TLS_PRF_SSL3:
tls_prf = ssl3_prf;
break;
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
case MBEDTLS_SSL_TLS_PRF_TLS1:
tls_prf = tls1_prf;
break;
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
case MBEDTLS_SSL_TLS_PRF_SHA384:
tls_prf = tls_prf_sha384;
break;
#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_SSL_TLS_PRF_SHA256:
tls_prf = tls_prf_sha256;
break;
#endif /* MBEDTLS_SHA256_C */
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
default:
return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
}
return tls_prf(secret, slen, label, random, rlen, dstbuf, dlen);
}
/* Type for the TLS PRF */
typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *,
const unsigned char *, size_t,
unsigned char *, size_t);
/*
* Populate a transform structure with session keys and all the other
* necessary information.
*
* Parameters:
* - [in/out]: transform: structure to populate
* [in] must be just initialised with mbedtls_ssl_transform_init()
* [out] fully populated, ready for use by mbedtls_ssl_{en,de}crypt_buf()
* - [in] ciphersuite
* - [in] master
* - [in] encrypt_then_mac
* - [in] trunc_hmac
* - [in] compression
* - [in] tls_prf: pointer to PRF to use for key derivation
* - [in] randbytes: buffer holding ServerHello.random + ClientHello.random
* - [in] minor_ver: SSL/TLS minor version
* - [in] endpoint: client or server
* - [in] ssl: optionally used for:
* - MBEDTLS_SSL_HW_RECORD_ACCEL: whole context (non-const)
* - MBEDTLS_SSL_EXPORT_KEYS: ssl->conf->{f,p}_export_keys
* - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_populate_transform(mbedtls_ssl_transform *transform,
int ciphersuite,
const unsigned char master[48],
#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
int encrypt_then_mac,
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
int trunc_hmac,
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
#if defined(MBEDTLS_ZLIB_SUPPORT)
int compression,
#endif
ssl_tls_prf_t tls_prf,
const unsigned char randbytes[64],
int minor_ver,
unsigned endpoint,
#if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
const
#endif
mbedtls_ssl_context *ssl)
{
int ret = 0;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int psa_fallthrough;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
int do_mbedtls_cipher_setup;
unsigned char keyblk[256];
unsigned char *key1;
unsigned char *key2;
unsigned char *mac_enc;
unsigned char *mac_dec;
size_t mac_key_len = 0;
size_t iv_copy_len;
unsigned keylen;
const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
const mbedtls_cipher_info_t *cipher_info;
const mbedtls_md_info_t *md_info;
#if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL) && \
!defined(MBEDTLS_SSL_EXPORT_KEYS) && \
!defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) && \
!defined(MBEDTLS_DEBUG_C)
ssl = NULL; /* make sure we don't use it except for those cases */
(void) ssl;
#endif
/*
* Some data just needs copying into the structure
*/
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) && \
defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
transform->encrypt_then_mac = encrypt_then_mac;
#endif
transform->minor_ver = minor_ver;
#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
memcpy(transform->randbytes, randbytes, sizeof(transform->randbytes));
#endif
/*
* Get various info structures
*/
ciphersuite_info = mbedtls_ssl_ciphersuite_from_id(ciphersuite);
if (ciphersuite_info == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("ciphersuite info for %d not found",
ciphersuite));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
cipher_info = mbedtls_cipher_info_from_type(ciphersuite_info->cipher);
if (cipher_info == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("cipher info for %u not found",
ciphersuite_info->cipher));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
md_info = mbedtls_md_info_from_type(ciphersuite_info->mac);
if (md_info == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("mbedtls_md info for %u not found",
(unsigned) ciphersuite_info->mac));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
/* Copy own and peer's CID if the use of the CID
* extension has been negotiated. */
if (ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_ENABLED) {
MBEDTLS_SSL_DEBUG_MSG(3, ("Copy CIDs into SSL transform"));
transform->in_cid_len = ssl->own_cid_len;
memcpy(transform->in_cid, ssl->own_cid, ssl->own_cid_len);
MBEDTLS_SSL_DEBUG_BUF(3, "Incoming CID", transform->in_cid,
transform->in_cid_len);
transform->out_cid_len = ssl->handshake->peer_cid_len;
memcpy(transform->out_cid, ssl->handshake->peer_cid,
ssl->handshake->peer_cid_len);
MBEDTLS_SSL_DEBUG_BUF(3, "Outgoing CID", transform->out_cid,
transform->out_cid_len);
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
/*
* Compute key block using the PRF
*/
ret = tls_prf(master, 48, "key expansion", randbytes, 64, keyblk, 256);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "prf", ret);
return ret;
}
MBEDTLS_SSL_DEBUG_MSG(3, ("ciphersuite = %s",
mbedtls_ssl_get_ciphersuite_name(ciphersuite)));
MBEDTLS_SSL_DEBUG_BUF(3, "master secret", master, 48);
MBEDTLS_SSL_DEBUG_BUF(4, "random bytes", randbytes, 64);
MBEDTLS_SSL_DEBUG_BUF(4, "key block", keyblk, 256);
/*
* Determine the appropriate key, IV and MAC length.
*/
keylen = cipher_info->key_bitlen / 8;
#if defined(MBEDTLS_GCM_C) || \
defined(MBEDTLS_CCM_C) || \
defined(MBEDTLS_CHACHAPOLY_C)
if (cipher_info->mode == MBEDTLS_MODE_GCM ||
cipher_info->mode == MBEDTLS_MODE_CCM ||
cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY) {
size_t explicit_ivlen;
transform->maclen = 0;
mac_key_len = 0;
transform->taglen =
ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
/* All modes haves 96-bit IVs, but the length of the static parts vary
* with mode and version:
* - For GCM and CCM in TLS 1.2, there's a static IV of 4 Bytes
* (to be concatenated with a dynamically chosen IV of 8 Bytes)
* - For ChaChaPoly in TLS 1.2, and all modes in TLS 1.3, there's
* a static IV of 12 Bytes (to be XOR'ed with the 8 Byte record
* sequence number).
*/
transform->ivlen = 12;
#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_4) {
transform->fixed_ivlen = 12;
} else
#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
{
if (cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY) {
transform->fixed_ivlen = 12;
} else {
transform->fixed_ivlen = 4;
}
}
/* Minimum length of encrypted record */
explicit_ivlen = transform->ivlen - transform->fixed_ivlen;
transform->minlen = explicit_ivlen + transform->taglen;
} else
#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */
#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
if (cipher_info->mode == MBEDTLS_MODE_STREAM ||
cipher_info->mode == MBEDTLS_MODE_CBC) {
/* Initialize HMAC contexts */
if ((ret = mbedtls_md_setup(&transform->md_ctx_enc, md_info, 1)) != 0 ||
(ret = mbedtls_md_setup(&transform->md_ctx_dec, md_info, 1)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_setup", ret);
goto end;
}
/* Get MAC length */
mac_key_len = mbedtls_md_get_size(md_info);
transform->maclen = mac_key_len;
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
/*
* If HMAC is to be truncated, we shall keep the leftmost bytes,
* (rfc 6066 page 13 or rfc 2104 section 4),
* so we only need to adjust the length here.
*/
if (trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED) {
transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT)
/* Fall back to old, non-compliant version of the truncated
* HMAC implementation which also truncates the key
* (Mbed TLS versions from 1.3 to 2.6.0) */
mac_key_len = transform->maclen;
#endif
}
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
/* IV length */
transform->ivlen = cipher_info->iv_size;
/* Minimum length */
if (cipher_info->mode == MBEDTLS_MODE_STREAM) {
transform->minlen = transform->maclen;
} else {
/*
* GenericBlockCipher:
* 1. if EtM is in use: one block plus MAC
* otherwise: * first multiple of blocklen greater than maclen
* 2. IV except for SSL3 and TLS 1.0
*/
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
if (encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED) {
transform->minlen = transform->maclen
+ cipher_info->block_size;
} else
#endif
{
transform->minlen = transform->maclen
+ cipher_info->block_size
- transform->maclen % cipher_info->block_size;
}
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
minor_ver == MBEDTLS_SSL_MINOR_VERSION_1) {
; /* No need to adjust minlen */
} else
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) {
transform->minlen += transform->ivlen;
} else
#endif
{
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto end;
}
}
} else
#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
{
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
MBEDTLS_SSL_DEBUG_MSG(3, ("keylen: %u, minlen: %u, ivlen: %u, maclen: %u",
(unsigned) keylen,
(unsigned) transform->minlen,
(unsigned) transform->ivlen,
(unsigned) transform->maclen));
/*
* Finally setup the cipher contexts, IVs and MAC secrets.
*/
#if defined(MBEDTLS_SSL_CLI_C)
if (endpoint == MBEDTLS_SSL_IS_CLIENT) {
key1 = keyblk + mac_key_len * 2;
key2 = keyblk + mac_key_len * 2 + keylen;
mac_enc = keyblk;
mac_dec = keyblk + mac_key_len;
/*
* This is not used in TLS v1.1.
*/
iv_copy_len = (transform->fixed_ivlen) ?
transform->fixed_ivlen : transform->ivlen;
memcpy(transform->iv_enc, key2 + keylen, iv_copy_len);
memcpy(transform->iv_dec, key2 + keylen + iv_copy_len,
iv_copy_len);
} else
#endif /* MBEDTLS_SSL_CLI_C */
#if defined(MBEDTLS_SSL_SRV_C)
if (endpoint == MBEDTLS_SSL_IS_SERVER) {
key1 = keyblk + mac_key_len * 2 + keylen;
key2 = keyblk + mac_key_len * 2;
mac_enc = keyblk + mac_key_len;
mac_dec = keyblk;
/*
* This is not used in TLS v1.1.
*/
iv_copy_len = (transform->fixed_ivlen) ?
transform->fixed_ivlen : transform->ivlen;
memcpy(transform->iv_dec, key1 + keylen, iv_copy_len);
memcpy(transform->iv_enc, key1 + keylen + iv_copy_len,
iv_copy_len);
} else
#endif /* MBEDTLS_SSL_SRV_C */
{
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto end;
}
#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
#if defined(MBEDTLS_SSL_PROTO_SSL3)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) {
if (mac_key_len > sizeof(transform->mac_enc)) {
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto end;
}
memcpy(transform->mac_enc, mac_enc, mac_key_len);
memcpy(transform->mac_dec, mac_dec, mac_key_len);
} else
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_2)
if (minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1) {
/* For HMAC-based ciphersuites, initialize the HMAC transforms.
For AEAD-based ciphersuites, there is nothing to do here. */
if (mac_key_len != 0) {
ret = mbedtls_md_hmac_starts(&transform->md_ctx_enc,
mac_enc, mac_key_len);
if (ret != 0) {
goto end;
}
ret = mbedtls_md_hmac_starts(&transform->md_ctx_dec,
mac_dec, mac_key_len);
if (ret != 0) {
goto end;
}
}
} else
#endif
{
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
goto end;
}
#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
if (mbedtls_ssl_hw_record_init != NULL) {
ret = 0;
MBEDTLS_SSL_DEBUG_MSG(2, ("going for mbedtls_ssl_hw_record_init()"));
if ((ret = mbedtls_ssl_hw_record_init(ssl, key1, key2, keylen,
transform->iv_enc, transform->iv_dec,
iv_copy_len,
mac_enc, mac_dec,
mac_key_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_hw_record_init", ret);
ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
goto end;
}
}
#else
((void) mac_dec);
((void) mac_enc);
#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
if (ssl->conf->f_export_keys != NULL) {
ssl->conf->f_export_keys(ssl->conf->p_export_keys,
master, keyblk,
mac_key_len, keylen,
iv_copy_len);
}
if (ssl->conf->f_export_keys_ext != NULL) {
ssl->conf->f_export_keys_ext(ssl->conf->p_export_keys,
master, keyblk,
mac_key_len, keylen,
iv_copy_len,
randbytes + 32,
randbytes,
tls_prf_get_type(tls_prf));
}
#endif
do_mbedtls_cipher_setup = 1;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/* Only use PSA-based ciphers for TLS-1.2.
* That's relevant at least for TLS-1.0, where
* we assume that mbedtls_cipher_crypt() updates
* the structure field for the IV, which the PSA-based
* implementation currently doesn't. */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) {
ret = mbedtls_cipher_setup_psa(&transform->cipher_ctx_enc,
cipher_info, transform->taglen);
if (ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup_psa", ret);
goto end;
}
if (ret == 0) {
MBEDTLS_SSL_DEBUG_MSG(3, ("Successfully setup PSA-based encryption cipher context"));
psa_fallthrough = 0;
} else {
MBEDTLS_SSL_DEBUG_MSG(1,
(
"Failed to setup PSA-based cipher context for record encryption - fall through to default setup."));
psa_fallthrough = 1;
}
} else {
psa_fallthrough = 1;
}
#else
psa_fallthrough = 1;
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
if (psa_fallthrough == 0) {
do_mbedtls_cipher_setup = 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if (do_mbedtls_cipher_setup &&
(ret = mbedtls_cipher_setup(&transform->cipher_ctx_enc,
cipher_info)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup", ret);
goto end;
}
do_mbedtls_cipher_setup = 1;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/* Only use PSA-based ciphers for TLS-1.2.
* That's relevant at least for TLS-1.0, where
* we assume that mbedtls_cipher_crypt() updates
* the structure field for the IV, which the PSA-based
* implementation currently doesn't. */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) {
ret = mbedtls_cipher_setup_psa(&transform->cipher_ctx_dec,
cipher_info, transform->taglen);
if (ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup_psa", ret);
goto end;
}
if (ret == 0) {
MBEDTLS_SSL_DEBUG_MSG(3, ("Successfully setup PSA-based decryption cipher context"));
psa_fallthrough = 0;
} else {
MBEDTLS_SSL_DEBUG_MSG(1,
(
"Failed to setup PSA-based cipher context for record decryption - fall through to default setup."));
psa_fallthrough = 1;
}
} else {
psa_fallthrough = 1;
}
#else
psa_fallthrough = 1;
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
if (psa_fallthrough == 0) {
do_mbedtls_cipher_setup = 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if (do_mbedtls_cipher_setup &&
(ret = mbedtls_cipher_setup(&transform->cipher_ctx_dec,
cipher_info)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setup", ret);
goto end;
}
if ((ret = mbedtls_cipher_setkey(&transform->cipher_ctx_enc, key1,
cipher_info->key_bitlen,
MBEDTLS_ENCRYPT)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setkey", ret);
goto end;
}
if ((ret = mbedtls_cipher_setkey(&transform->cipher_ctx_dec, key2,
cipher_info->key_bitlen,
MBEDTLS_DECRYPT)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_setkey", ret);
goto end;
}
#if defined(MBEDTLS_CIPHER_MODE_CBC)
if (cipher_info->mode == MBEDTLS_MODE_CBC) {
if ((ret = mbedtls_cipher_set_padding_mode(&transform->cipher_ctx_enc,
MBEDTLS_PADDING_NONE)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_set_padding_mode", ret);
goto end;
}
if ((ret = mbedtls_cipher_set_padding_mode(&transform->cipher_ctx_dec,
MBEDTLS_PADDING_NONE)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_cipher_set_padding_mode", ret);
goto end;
}
}
#endif /* MBEDTLS_CIPHER_MODE_CBC */
/* Initialize Zlib contexts */
#if defined(MBEDTLS_ZLIB_SUPPORT)
if (compression == MBEDTLS_SSL_COMPRESS_DEFLATE) {
MBEDTLS_SSL_DEBUG_MSG(3, ("Initializing zlib states"));
memset(&transform->ctx_deflate, 0, sizeof(transform->ctx_deflate));
memset(&transform->ctx_inflate, 0, sizeof(transform->ctx_inflate));
if (deflateInit(&transform->ctx_deflate,
Z_DEFAULT_COMPRESSION) != Z_OK ||
inflateInit(&transform->ctx_inflate) != Z_OK) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Failed to initialize compression"));
ret = MBEDTLS_ERR_SSL_COMPRESSION_FAILED;
goto end;
}
}
#endif /* MBEDTLS_ZLIB_SUPPORT */
end:
mbedtls_platform_zeroize(keyblk, sizeof(keyblk));
return ret;
}
/*
* Set appropriate PRF function and other SSL / TLS 1.0/1.1 / TLS1.2 functions
*
* Inputs:
* - SSL/TLS minor version
* - hash associated with the ciphersuite (only used by TLS 1.2)
*
* Outputs:
* - the tls_prf, calc_verify and calc_finished members of handshake structure
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_set_handshake_prfs(mbedtls_ssl_handshake_params *handshake,
int minor_ver,
mbedtls_md_type_t hash)
{
#if !defined(MBEDTLS_SSL_PROTO_TLS1_2) || \
!(defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384))
(void) hash;
#endif
#if defined(MBEDTLS_SSL_PROTO_SSL3)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) {
handshake->tls_prf = ssl3_prf;
handshake->calc_verify = ssl_calc_verify_ssl;
handshake->calc_finished = ssl_calc_finished_ssl;
} else
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
if (minor_ver < MBEDTLS_SSL_MINOR_VERSION_3) {
handshake->tls_prf = tls1_prf;
handshake->calc_verify = ssl_calc_verify_tls;
handshake->calc_finished = ssl_calc_finished_tls;
} else
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
hash == MBEDTLS_MD_SHA384) {
handshake->tls_prf = tls_prf_sha384;
handshake->calc_verify = ssl_calc_verify_tls_sha384;
handshake->calc_finished = ssl_calc_finished_tls_sha384;
} else
#endif
#if defined(MBEDTLS_SHA256_C)
if (minor_ver == MBEDTLS_SSL_MINOR_VERSION_3) {
handshake->tls_prf = tls_prf_sha256;
handshake->calc_verify = ssl_calc_verify_tls_sha256;
handshake->calc_finished = ssl_calc_finished_tls_sha256;
} else
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
{
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
return 0;
}
/*
* Compute master secret if needed
*
* Parameters:
* [in/out] handshake
* [in] resume, premaster, extended_ms, calc_verify, tls_prf
* (PSA-PSK) ciphersuite_info, psk_opaque
* [out] premaster (cleared)
* [out] master
* [in] ssl: optionally used for debugging, EMS and PSA-PSK
* debug: conf->f_dbg, conf->p_dbg
* EMS: passed to calc_verify (debug + (SSL3) session_negotiate)
* PSA-PSA: minor_ver, conf
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_compute_master(mbedtls_ssl_handshake_params *handshake,
unsigned char *master,
const mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* cf. RFC 5246, Section 8.1:
* "The master secret is always exactly 48 bytes in length." */
size_t const master_secret_len = 48;
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
unsigned char session_hash[48];
#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
/* The label for the KDF used for key expansion.
* This is either "master secret" or "extended master secret"
* depending on whether the Extended Master Secret extension
* is used. */
char const *lbl = "master secret";
/* The salt for the KDF used for key expansion.
* - If the Extended Master Secret extension is not used,
* this is ClientHello.Random + ServerHello.Random
* (see Sect. 8.1 in RFC 5246).
* - If the Extended Master Secret extension is used,
* this is the transcript of the handshake so far.
* (see Sect. 4 in RFC 7627). */
unsigned char const *salt = handshake->randbytes;
size_t salt_len = 64;
#if !defined(MBEDTLS_DEBUG_C) && \
!defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) && \
!(defined(MBEDTLS_USE_PSA_CRYPTO) && \
defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED))
ssl = NULL; /* make sure we don't use it except for those cases */
(void) ssl;
#endif
if (handshake->resume != 0) {
MBEDTLS_SSL_DEBUG_MSG(3, ("no premaster (session resumed)"));
return 0;
}
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
if (handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED) {
lbl = "extended master secret";
salt = session_hash;
handshake->calc_verify(ssl, session_hash, &salt_len);
MBEDTLS_SSL_DEBUG_BUF(3, "session hash for extended master secret",
session_hash, salt_len);
}
#endif /* MBEDTLS_SSL_EXTENDED_MS_ENABLED */
#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
if (handshake->ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK &&
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
ssl_use_opaque_psk(ssl) == 1) {
/* Perform PSK-to-MS expansion in a single step. */
psa_status_t status;
psa_algorithm_t alg;
psa_key_id_t psk;
psa_key_derivation_operation_t derivation =
PSA_KEY_DERIVATION_OPERATION_INIT;
mbedtls_md_type_t hash_alg = handshake->ciphersuite_info->mac;
MBEDTLS_SSL_DEBUG_MSG(2, ("perform PSA-based PSK-to-MS expansion"));
psk = mbedtls_ssl_get_opaque_psk(ssl);
if (hash_alg == MBEDTLS_MD_SHA384) {
alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384);
} else {
alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256);
}
status = setup_psa_key_derivation(&derivation, psk, alg,
salt, salt_len,
(unsigned char const *) lbl,
(size_t) strlen(lbl),
master_secret_len);
if (status != PSA_SUCCESS) {
psa_key_derivation_abort(&derivation);
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
status = psa_key_derivation_output_bytes(&derivation,
master,
master_secret_len);
if (status != PSA_SUCCESS) {
psa_key_derivation_abort(&derivation);
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
status = psa_key_derivation_abort(&derivation);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
} else
#endif
{
ret = handshake->tls_prf(handshake->premaster, handshake->pmslen,
lbl, salt, salt_len,
master,
master_secret_len);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "prf", ret);
return ret;
}
MBEDTLS_SSL_DEBUG_BUF(3, "premaster secret",
handshake->premaster,
handshake->pmslen);
mbedtls_platform_zeroize(handshake->premaster,
sizeof(handshake->premaster));
}
return 0;
}
int mbedtls_ssl_derive_keys(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const mbedtls_ssl_ciphersuite_t * const ciphersuite_info =
ssl->handshake->ciphersuite_info;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> derive keys"));
/* Set PRF, calc_verify and calc_finished function pointers */
ret = ssl_set_handshake_prfs(ssl->handshake,
ssl->minor_ver,
ciphersuite_info->mac);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_set_handshake_prfs", ret);
return ret;
}
/* Compute master secret if needed */
ret = ssl_compute_master(ssl->handshake,
ssl->session_negotiate->master,
ssl);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_compute_master", ret);
return ret;
}
/* Swap the client and server random values:
* - MS derivation wanted client+server (RFC 5246 8.1)
* - key derivation wants server+client (RFC 5246 6.3) */
{
unsigned char tmp[64];
memcpy(tmp, ssl->handshake->randbytes, 64);
memcpy(ssl->handshake->randbytes, tmp + 32, 32);
memcpy(ssl->handshake->randbytes + 32, tmp, 32);
mbedtls_platform_zeroize(tmp, sizeof(tmp));
}
/* Populate transform structure */
ret = ssl_populate_transform(ssl->transform_negotiate,
ssl->session_negotiate->ciphersuite,
ssl->session_negotiate->master,
#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
ssl->session_negotiate->encrypt_then_mac,
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
ssl->session_negotiate->trunc_hmac,
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
#if defined(MBEDTLS_ZLIB_SUPPORT)
ssl->session_negotiate->compression,
#endif
ssl->handshake->tls_prf,
ssl->handshake->randbytes,
ssl->minor_ver,
ssl->conf->endpoint,
ssl);
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "ssl_populate_transform", ret);
return ret;
}
/* We no longer need Server/ClientHello.random values */
mbedtls_platform_zeroize(ssl->handshake->randbytes,
sizeof(ssl->handshake->randbytes));
/* Allocate compression buffer */
#if defined(MBEDTLS_ZLIB_SUPPORT)
if (ssl->session_negotiate->compression == MBEDTLS_SSL_COMPRESS_DEFLATE &&
ssl->compress_buf == NULL) {
MBEDTLS_SSL_DEBUG_MSG(3, ("Allocating compression buffer"));
ssl->compress_buf = mbedtls_calloc(1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN);
if (ssl->compress_buf == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%d bytes) failed",
MBEDTLS_SSL_COMPRESS_BUFFER_LEN));
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
}
#endif
MBEDTLS_SSL_DEBUG_MSG(2, ("<= derive keys"));
return 0;
}
#if defined(MBEDTLS_SSL_PROTO_SSL3)
void ssl_calc_verify_ssl(const mbedtls_ssl_context *ssl,
unsigned char *hash,
size_t *hlen)
{
mbedtls_md5_context md5;
mbedtls_sha1_context sha1;
unsigned char pad_1[48];
unsigned char pad_2[48];
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify ssl"));
mbedtls_md5_init(&md5);
mbedtls_sha1_init(&sha1);
mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5);
mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1);
memset(pad_1, 0x36, 48);
memset(pad_2, 0x5C, 48);
mbedtls_md5_update_ret(&md5, ssl->session_negotiate->master, 48);
mbedtls_md5_update_ret(&md5, pad_1, 48);
mbedtls_md5_finish_ret(&md5, hash);
mbedtls_md5_starts_ret(&md5);
mbedtls_md5_update_ret(&md5, ssl->session_negotiate->master, 48);
mbedtls_md5_update_ret(&md5, pad_2, 48);
mbedtls_md5_update_ret(&md5, hash, 16);
mbedtls_md5_finish_ret(&md5, hash);
mbedtls_sha1_update_ret(&sha1, ssl->session_negotiate->master, 48);
mbedtls_sha1_update_ret(&sha1, pad_1, 40);
mbedtls_sha1_finish_ret(&sha1, hash + 16);
mbedtls_sha1_starts_ret(&sha1);
mbedtls_sha1_update_ret(&sha1, ssl->session_negotiate->master, 48);
mbedtls_sha1_update_ret(&sha1, pad_2, 40);
mbedtls_sha1_update_ret(&sha1, hash + 16, 20);
mbedtls_sha1_finish_ret(&sha1, hash + 16);
*hlen = 36;
MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen);
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify"));
mbedtls_md5_free(&md5);
mbedtls_sha1_free(&sha1);
return;
}
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
void ssl_calc_verify_tls(const mbedtls_ssl_context *ssl,
unsigned char *hash,
size_t *hlen)
{
mbedtls_md5_context md5;
mbedtls_sha1_context sha1;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify tls"));
mbedtls_md5_init(&md5);
mbedtls_sha1_init(&sha1);
mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5);
mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1);
mbedtls_md5_finish_ret(&md5, hash);
mbedtls_sha1_finish_ret(&sha1, hash + 16);
*hlen = 36;
MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen);
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify"));
mbedtls_md5_free(&md5);
mbedtls_sha1_free(&sha1);
return;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
void ssl_calc_verify_tls_sha256(const mbedtls_ssl_context *ssl,
unsigned char *hash,
size_t *hlen)
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
size_t hash_size;
psa_status_t status;
psa_hash_operation_t sha256_psa = psa_hash_operation_init();
MBEDTLS_SSL_DEBUG_MSG(2, ("=> PSA calc verify sha256"));
status = psa_hash_clone(&ssl->handshake->fin_sha256_psa, &sha256_psa);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed"));
return;
}
status = psa_hash_finish(&sha256_psa, hash, 32, &hash_size);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed"));
return;
}
*hlen = 32;
MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated verify result", hash, *hlen);
MBEDTLS_SSL_DEBUG_MSG(2, ("<= PSA calc verify"));
#else
mbedtls_sha256_context sha256;
mbedtls_sha256_init(&sha256);
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify sha256"));
mbedtls_sha256_clone(&sha256, &ssl->handshake->fin_sha256);
mbedtls_sha256_finish_ret(&sha256, hash);
*hlen = 32;
MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen);
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify"));
mbedtls_sha256_free(&sha256);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
return;
}
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
void ssl_calc_verify_tls_sha384(const mbedtls_ssl_context *ssl,
unsigned char *hash,
size_t *hlen)
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
size_t hash_size;
psa_status_t status;
psa_hash_operation_t sha384_psa = psa_hash_operation_init();
MBEDTLS_SSL_DEBUG_MSG(2, ("=> PSA calc verify sha384"));
status = psa_hash_clone(&ssl->handshake->fin_sha384_psa, &sha384_psa);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed"));
return;
}
status = psa_hash_finish(&sha384_psa, hash, 48, &hash_size);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed"));
return;
}
*hlen = 48;
MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated verify result", hash, *hlen);
MBEDTLS_SSL_DEBUG_MSG(2, ("<= PSA calc verify"));
#else
mbedtls_sha512_context sha512;
mbedtls_sha512_init(&sha512);
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc verify sha384"));
mbedtls_sha512_clone(&sha512, &ssl->handshake->fin_sha512);
mbedtls_sha512_finish_ret(&sha512, hash);
*hlen = 48;
MBEDTLS_SSL_DEBUG_BUF(3, "calculated verify result", hash, *hlen);
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc verify"));
mbedtls_sha512_free(&sha512);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
return;
}
#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
int mbedtls_ssl_psk_derive_premaster(mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex)
{
unsigned char *p = ssl->handshake->premaster;
unsigned char *end = p + sizeof(ssl->handshake->premaster);
const unsigned char *psk = NULL;
size_t psk_len = 0;
if (mbedtls_ssl_get_psk(ssl, &psk, &psk_len)
== MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED) {
/*
* This should never happen because the existence of a PSK is always
* checked before calling this function
*/
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
/*
* PMS = struct {
* opaque other_secret<0..2^16-1>;
* opaque psk<0..2^16-1>;
* };
* with "other_secret" depending on the particular key exchange
*/
#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
if (key_ex == MBEDTLS_KEY_EXCHANGE_PSK) {
if (end - p < 2) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
MBEDTLS_PUT_UINT16_BE(psk_len, p, 0);
p += 2;
if (end < p || (size_t) (end - p) < psk_len) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
memset(p, 0, psk_len);
p += psk_len;
} else
#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
if (key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK) {
/*
* other_secret already set by the ClientKeyExchange message,
* and is 48 bytes long
*/
if (end - p < 2) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
*p++ = 0;
*p++ = 48;
p += 48;
} else
#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
if (key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK) {
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
/* Write length only when we know the actual value */
if ((ret = mbedtls_dhm_calc_secret(&ssl->handshake->dhm_ctx,
p + 2, end - (p + 2), &len,
ssl->conf->f_rng, ssl->conf->p_rng)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_dhm_calc_secret", ret);
return ret;
}
MBEDTLS_PUT_UINT16_BE(len, p, 0);
p += 2 + len;
MBEDTLS_SSL_DEBUG_MPI(3, "DHM: K ", &ssl->handshake->dhm_ctx.K);
} else
#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if (key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK) {
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t zlen;
if ((ret = mbedtls_ecdh_calc_secret(&ssl->handshake->ecdh_ctx, &zlen,
p + 2, end - (p + 2),
ssl->conf->f_rng, ssl->conf->p_rng)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ecdh_calc_secret", ret);
return ret;
}
MBEDTLS_PUT_UINT16_BE(zlen, p, 0);
p += 2 + zlen;
MBEDTLS_SSL_DEBUG_ECDH(3, &ssl->handshake->ecdh_ctx,
MBEDTLS_DEBUG_ECDH_Z);
} else
#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
{
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
/* opaque psk<0..2^16-1>; */
if (end - p < 2) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
MBEDTLS_PUT_UINT16_BE(psk_len, p, 0);
p += 2;
if (end < p || (size_t) (end - p) < psk_len) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
memcpy(p, psk, psk_len);
p += psk_len;
ssl->handshake->pmslen = p - ssl->handshake->premaster;
return 0;
}
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_hello_request(mbedtls_ssl_context *ssl);
#if defined(MBEDTLS_SSL_PROTO_DTLS)
int mbedtls_ssl_resend_hello_request(mbedtls_ssl_context *ssl)
{
/* If renegotiation is not enforced, retransmit until we would reach max
* timeout if we were using the usual handshake doubling scheme */
if (ssl->conf->renego_max_records < 0) {
uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
unsigned char doublings = 1;
while (ratio != 0) {
++doublings;
ratio >>= 1;
}
if (++ssl->renego_records_seen > doublings) {
MBEDTLS_SSL_DEBUG_MSG(2, ("no longer retransmitting hello request"));
return 0;
}
}
return ssl_write_hello_request(ssl);
}
#endif
#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
static void ssl_clear_peer_cert(mbedtls_ssl_session *session)
{
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if (session->peer_cert != NULL) {
mbedtls_x509_crt_free(session->peer_cert);
mbedtls_free(session->peer_cert);
session->peer_cert = NULL;
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
if (session->peer_cert_digest != NULL) {
/* Zeroization is not necessary. */
mbedtls_free(session->peer_cert_digest);
session->peer_cert_digest = NULL;
session->peer_cert_digest_type = MBEDTLS_MD_NONE;
session->peer_cert_digest_len = 0;
}
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/*
* Handshake functions
*/
#if !defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/* No certificate support -> dummy functions */
int mbedtls_ssl_write_certificate(mbedtls_ssl_context *ssl)
{
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
ssl->handshake->ciphersuite_info;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> write certificate"));
if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) {
MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate"));
ssl->state++;
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
int mbedtls_ssl_parse_certificate(mbedtls_ssl_context *ssl)
{
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
ssl->handshake->ciphersuite_info;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse certificate"));
if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) {
MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip parse certificate"));
ssl->state++;
return 0;
}
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
#else /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
/* Some certificate support -> implement write and parse */
int mbedtls_ssl_write_certificate(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
size_t i, n;
const mbedtls_x509_crt *crt;
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
ssl->handshake->ciphersuite_info;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> write certificate"));
if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) {
MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate"));
ssl->state++;
return 0;
}
#if defined(MBEDTLS_SSL_CLI_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
if (ssl->client_auth == 0) {
MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip write certificate"));
ssl->state++;
return 0;
}
#if defined(MBEDTLS_SSL_PROTO_SSL3)
/*
* If using SSLv3 and got no cert, send an Alert message
* (otherwise an empty Certificate message will be sent).
*/
if (mbedtls_ssl_own_cert(ssl) == NULL &&
ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) {
ssl->out_msglen = 2;
ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
MBEDTLS_SSL_DEBUG_MSG(2, ("got no certificate to send"));
goto write_msg;
}
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
}
#endif /* MBEDTLS_SSL_CLI_C */
#if defined(MBEDTLS_SSL_SRV_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
if (mbedtls_ssl_own_cert(ssl) == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("got no certificate to send"));
return MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED;
}
}
#endif
MBEDTLS_SSL_DEBUG_CRT(3, "own certificate", mbedtls_ssl_own_cert(ssl));
/*
* 0 . 0 handshake type
* 1 . 3 handshake length
* 4 . 6 length of all certs
* 7 . 9 length of cert. 1
* 10 . n-1 peer certificate
* n . n+2 length of cert. 2
* n+3 . ... upper level cert, etc.
*/
i = 7;
crt = mbedtls_ssl_own_cert(ssl);
while (crt != NULL) {
n = crt->raw.len;
if (n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i) {
MBEDTLS_SSL_DEBUG_MSG(1, ("certificate too large, %" MBEDTLS_PRINTF_SIZET
" > %" MBEDTLS_PRINTF_SIZET,
i + 3 + n, (size_t) MBEDTLS_SSL_OUT_CONTENT_LEN));
return MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE;
}
ssl->out_msg[i] = MBEDTLS_BYTE_2(n);
ssl->out_msg[i + 1] = MBEDTLS_BYTE_1(n);
ssl->out_msg[i + 2] = MBEDTLS_BYTE_0(n);
i += 3; memcpy(ssl->out_msg + i, crt->raw.p, n);
i += n; crt = crt->next;
}
ssl->out_msg[4] = MBEDTLS_BYTE_2(i - 7);
ssl->out_msg[5] = MBEDTLS_BYTE_1(i - 7);
ssl->out_msg[6] = MBEDTLS_BYTE_0(i - 7);
ssl->out_msglen = i;
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
write_msg:
#endif
ssl->state++;
if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret);
return ret;
}
MBEDTLS_SSL_DEBUG_MSG(2, ("<= write certificate"));
return ret;
}
#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_check_peer_crt_unchanged(mbedtls_ssl_context *ssl,
unsigned char *crt_buf,
size_t crt_buf_len)
{
mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert;
if (peer_crt == NULL) {
return -1;
}
if (peer_crt->raw.len != crt_buf_len) {
return -1;
}
return memcmp(peer_crt->raw.p, crt_buf, peer_crt->raw.len);
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_check_peer_crt_unchanged(mbedtls_ssl_context *ssl,
unsigned char *crt_buf,
size_t crt_buf_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char const * const peer_cert_digest =
ssl->session->peer_cert_digest;
mbedtls_md_type_t const peer_cert_digest_type =
ssl->session->peer_cert_digest_type;
mbedtls_md_info_t const * const digest_info =
mbedtls_md_info_from_type(peer_cert_digest_type);
unsigned char tmp_digest[MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN];
size_t digest_len;
if (peer_cert_digest == NULL || digest_info == NULL) {
return -1;
}
digest_len = mbedtls_md_get_size(digest_info);
if (digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN) {
return -1;
}
ret = mbedtls_md(digest_info, crt_buf, crt_buf_len, tmp_digest);
if (ret != 0) {
return -1;
}
return memcmp(tmp_digest, peer_cert_digest, digest_len);
}
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
/*
* Once the certificate message is read, parse it into a cert chain and
* perform basic checks, but leave actual verification to the caller
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_certificate_chain(mbedtls_ssl_context *ssl,
mbedtls_x509_crt *chain)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
int crt_cnt = 0;
#endif
size_t i, n;
uint8_t alert;
if (ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE);
return MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE;
}
if (ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
ssl->in_hslen < mbedtls_ssl_hs_hdr_len(ssl) + 3 + 3) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
i = mbedtls_ssl_hs_hdr_len(ssl);
/*
* Same message structure as in mbedtls_ssl_write_certificate()
*/
n = (ssl->in_msg[i+1] << 8) | ssl->in_msg[i+2];
if (ssl->in_msg[i] != 0 ||
ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len(ssl)) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
/* Make &ssl->in_msg[i] point to the beginning of the CRT chain. */
i += 3;
/* Iterate through and parse the CRTs in the provided chain. */
while (i < ssl->in_hslen) {
/* Check that there's room for the next CRT's length fields. */
if (i + 3 > ssl->in_hslen) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message"));
mbedtls_ssl_send_alert_message(ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
/* In theory, the CRT can be up to 2**24 Bytes, but we don't support
* anything beyond 2**16 ~ 64K. */
if (ssl->in_msg[i] != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message"));
mbedtls_ssl_send_alert_message(ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
/* Read length of the next CRT in the chain. */
n = ((unsigned int) ssl->in_msg[i + 1] << 8)
| (unsigned int) ssl->in_msg[i + 2];
i += 3;
if (n < 128 || i + n > ssl->in_hslen) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate message"));
mbedtls_ssl_send_alert_message(ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
/* Check if we're handling the first CRT in the chain. */
#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
if (crt_cnt++ == 0 &&
ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) {
/* During client-side renegotiation, check that the server's
* end-CRTs hasn't changed compared to the initial handshake,
* mitigating the triple handshake attack. On success, reuse
* the original end-CRT instead of parsing it again. */
MBEDTLS_SSL_DEBUG_MSG(3, ("Check that peer CRT hasn't changed during renegotiation"));
if (ssl_check_peer_crt_unchanged(ssl,
&ssl->in_msg[i],
n) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("new server cert during renegotiation"));
mbedtls_ssl_send_alert_message(ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED);
return MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
/* Now we can safely free the original chain. */
ssl_clear_peer_cert(ssl->session);
}
#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
/* Parse the next certificate in the chain. */
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
ret = mbedtls_x509_crt_parse_der(chain, ssl->in_msg + i, n);
#else
/* If we don't need to store the CRT chain permanently, parse
* it in-place from the input buffer instead of making a copy. */
ret = mbedtls_x509_crt_parse_der_nocopy(chain, ssl->in_msg + i, n);
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
switch (ret) {
case 0: /*ok*/
case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND:
/* Ignore certificate with an unknown algorithm: maybe a
prior certificate was already trusted. */
break;
case MBEDTLS_ERR_X509_ALLOC_FAILED:
alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR;
goto crt_parse_der_failed;
case MBEDTLS_ERR_X509_UNKNOWN_VERSION:
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
goto crt_parse_der_failed;
default:
alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
crt_parse_der_failed:
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert);
MBEDTLS_SSL_DEBUG_RET(1, " mbedtls_x509_crt_parse_der", ret);
return ret;
}
i += n;
}
MBEDTLS_SSL_DEBUG_CRT(3, "peer certificate", chain);
return 0;
}
#if defined(MBEDTLS_SSL_SRV_C)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_srv_check_client_no_crt_notification(mbedtls_ssl_context *ssl)
{
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
return -1;
}
#if defined(MBEDTLS_SSL_PROTO_SSL3)
/*
* Check if the client sent an empty certificate
*/
if (ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) {
if (ssl->in_msglen == 2 &&
ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT) {
MBEDTLS_SSL_DEBUG_MSG(1, ("SSLv3 client has no certificate"));
return 0;
}
return -1;
}
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_2)
if (ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len(ssl) &&
ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
memcmp(ssl->in_msg + mbedtls_ssl_hs_hdr_len(ssl), "\0\0\0", 3) == 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("TLSv1 client has no certificate"));
return 0;
}
return -1;
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
MBEDTLS_SSL_PROTO_TLS1_2 */
}
#endif /* MBEDTLS_SSL_SRV_C */
/* Check if a certificate message is expected.
* Return either
* - SSL_CERTIFICATE_EXPECTED, or
* - SSL_CERTIFICATE_SKIP
* indicating whether a Certificate message is expected or not.
*/
#define SSL_CERTIFICATE_EXPECTED 0
#define SSL_CERTIFICATE_SKIP 1
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_certificate_coordinate(mbedtls_ssl_context *ssl,
int authmode)
{
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
ssl->handshake->ciphersuite_info;
if (!mbedtls_ssl_ciphersuite_uses_srv_cert(ciphersuite_info)) {
return SSL_CERTIFICATE_SKIP;
}
#if defined(MBEDTLS_SSL_SRV_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
if (ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK) {
return SSL_CERTIFICATE_SKIP;
}
if (authmode == MBEDTLS_SSL_VERIFY_NONE) {
ssl->session_negotiate->verify_result =
MBEDTLS_X509_BADCERT_SKIP_VERIFY;
return SSL_CERTIFICATE_SKIP;
}
}
#else
((void) authmode);
#endif /* MBEDTLS_SSL_SRV_C */
return SSL_CERTIFICATE_EXPECTED;
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_parse_certificate_verify(mbedtls_ssl_context *ssl,
int authmode,
mbedtls_x509_crt *chain,
void *rs_ctx)
{
int ret = 0;
const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
ssl->handshake->ciphersuite_info;
int have_ca_chain = 0;
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *);
void *p_vrfy;
if (authmode == MBEDTLS_SSL_VERIFY_NONE) {
return 0;
}
if (ssl->f_vrfy != NULL) {
MBEDTLS_SSL_DEBUG_MSG(3, ("Use context-specific verification callback"));
f_vrfy = ssl->f_vrfy;
p_vrfy = ssl->p_vrfy;
} else {
MBEDTLS_SSL_DEBUG_MSG(3, ("Use configuration-specific verification callback"));
f_vrfy = ssl->conf->f_vrfy;
p_vrfy = ssl->conf->p_vrfy;
}
/*
* Main check: verify certificate
*/
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
if (ssl->conf->f_ca_cb != NULL) {
((void) rs_ctx);
have_ca_chain = 1;
MBEDTLS_SSL_DEBUG_MSG(3, ("use CA callback for X.509 CRT verification"));
ret = mbedtls_x509_crt_verify_with_ca_cb(
chain,
ssl->conf->f_ca_cb,
ssl->conf->p_ca_cb,
ssl->conf->cert_profile,
ssl->hostname,
&ssl->session_negotiate->verify_result,
f_vrfy, p_vrfy);
} else
#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
{
mbedtls_x509_crt *ca_chain;
mbedtls_x509_crl *ca_crl;
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
if (ssl->handshake->sni_ca_chain != NULL) {
ca_chain = ssl->handshake->sni_ca_chain;
ca_crl = ssl->handshake->sni_ca_crl;
} else
#endif
{
ca_chain = ssl->conf->ca_chain;
ca_crl = ssl->conf->ca_crl;
}
if (ca_chain != NULL) {
have_ca_chain = 1;
}
ret = mbedtls_x509_crt_verify_restartable(
chain,
ca_chain, ca_crl,
ssl->conf->cert_profile,
ssl->hostname,
&ssl->session_negotiate->verify_result,
f_vrfy, p_vrfy, rs_ctx);
}
if (ret != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "x509_verify_cert", ret);
}
#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
if (ret == MBEDTLS_ERR_ECP_IN_PROGRESS) {
return MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS;
}
#endif
/*
* Secondary checks: always done, but change 'ret' only if it was 0
*/
#if defined(MBEDTLS_ECP_C)
{
const mbedtls_pk_context *pk = &chain->pk;
/* If certificate uses an EC key, make sure the curve is OK.
* This is a public key, so it can't be opaque, so can_do() is a good
* enough check to ensure pk_ec() is safe to use here. */
if (mbedtls_pk_can_do(pk, MBEDTLS_PK_ECKEY) &&
mbedtls_ssl_check_curve(ssl, mbedtls_pk_ec(*pk)->grp.id) != 0) {
ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY;
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate (EC key curve)"));
if (ret == 0) {
ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
}
}
#endif /* MBEDTLS_ECP_C */
if (mbedtls_ssl_check_cert_usage(chain,
ciphersuite_info,
!ssl->conf->endpoint,
&ssl->session_negotiate->verify_result) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad certificate (usage extensions)"));
if (ret == 0) {
ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
}
}
/* mbedtls_x509_crt_verify_with_profile is supposed to report a
* verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED,
* with details encoded in the verification flags. All other kinds
* of error codes, including those from the user provided f_vrfy
* functions, are treated as fatal and lead to a failure of
* ssl_parse_certificate even if verification was optional. */
if (authmode == MBEDTLS_SSL_VERIFY_OPTIONAL &&
(ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ||
ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE)) {
ret = 0;
}
if (have_ca_chain == 0 && authmode == MBEDTLS_SSL_VERIFY_REQUIRED) {
MBEDTLS_SSL_DEBUG_MSG(1, ("got no CA chain"));
ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED;
}
if (ret != 0) {
uint8_t alert;
/* The certificate may have been rejected for several reasons.
Pick one and send the corresponding alert. Which alert to send
may be a subject of debate in some cases. */
if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER) {
alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH) {
alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE) {
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE) {
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE) {
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK) {
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY) {
alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED) {
alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED) {
alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED;
} else if (ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED) {
alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA;
} else {
alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN;
}
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
alert);
}
#if defined(MBEDTLS_DEBUG_C)
if (ssl->session_negotiate->verify_result != 0) {
MBEDTLS_SSL_DEBUG_MSG(3, ("! Certificate verification flags %08x",
(unsigned int) ssl->session_negotiate->verify_result));
} else {
MBEDTLS_SSL_DEBUG_MSG(3, ("Certificate verification flags clear"));
}
#endif /* MBEDTLS_DEBUG_C */
return ret;
}
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_remember_peer_crt_digest(mbedtls_ssl_context *ssl,
unsigned char *start, size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* Remember digest of the peer's end-CRT. */
ssl->session_negotiate->peer_cert_digest =
mbedtls_calloc(1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN);
if (ssl->session_negotiate->peer_cert_digest == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%d bytes) failed",
MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN));
mbedtls_ssl_send_alert_message(ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR);
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
ret = mbedtls_md(mbedtls_md_info_from_type(
MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE),
start, len,
ssl->session_negotiate->peer_cert_digest);
ssl->session_negotiate->peer_cert_digest_type =
MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE;
ssl->session_negotiate->peer_cert_digest_len =
MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN;
return ret;
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_remember_peer_pubkey(mbedtls_ssl_context *ssl,
unsigned char *start, size_t len)
{
unsigned char *end = start + len;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* Make a copy of the peer's raw public key. */
mbedtls_pk_init(&ssl->handshake->peer_pubkey);
ret = mbedtls_pk_parse_subpubkey(&start, end,
&ssl->handshake->peer_pubkey);
if (ret != 0) {
/* We should have parsed the public key before. */
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
return 0;
}
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
int mbedtls_ssl_parse_certificate(mbedtls_ssl_context *ssl)
{
int ret = 0;
int crt_expected;
#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET
? ssl->handshake->sni_authmode
: ssl->conf->authmode;
#else
const int authmode = ssl->conf->authmode;
#endif
void *rs_ctx = NULL;
mbedtls_x509_crt *chain = NULL;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse certificate"));
crt_expected = ssl_parse_certificate_coordinate(ssl, authmode);
if (crt_expected == SSL_CERTIFICATE_SKIP) {
MBEDTLS_SSL_DEBUG_MSG(2, ("<= skip parse certificate"));
goto exit;
}
#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
if (ssl->handshake->ecrs_enabled &&
ssl->handshake->ecrs_state == ssl_ecrs_crt_verify) {
chain = ssl->handshake->ecrs_peer_cert;
ssl->handshake->ecrs_peer_cert = NULL;
goto crt_verify;
}
#endif
if ((ret = mbedtls_ssl_read_record(ssl, 1)) != 0) {
/* mbedtls_ssl_read_record may have sent an alert already. We
let it decide whether to alert. */
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_read_record", ret);
goto exit;
}
#if defined(MBEDTLS_SSL_SRV_C)
if (ssl_srv_check_client_no_crt_notification(ssl) == 0) {
ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
if (authmode != MBEDTLS_SSL_VERIFY_OPTIONAL) {
ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE;
}
goto exit;
}
#endif /* MBEDTLS_SSL_SRV_C */
/* Clear existing peer CRT structure in case we tried to
* reuse a session but it failed, and allocate a new one. */
ssl_clear_peer_cert(ssl->session_negotiate);
chain = mbedtls_calloc(1, sizeof(mbedtls_x509_crt));
if (chain == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed",
sizeof(mbedtls_x509_crt)));
mbedtls_ssl_send_alert_message(ssl,
MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR);
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto exit;
}
mbedtls_x509_crt_init(chain);
ret = ssl_parse_certificate_chain(ssl, chain);
if (ret != 0) {
goto exit;
}
#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
if (ssl->handshake->ecrs_enabled) {
ssl->handshake->ecrs_state = ssl_ecrs_crt_verify;
}
crt_verify:
if (ssl->handshake->ecrs_enabled) {
rs_ctx = &ssl->handshake->ecrs_ctx;
}
#endif
ret = ssl_parse_certificate_verify(ssl, authmode,
chain, rs_ctx);
if (ret != 0) {
goto exit;
}
#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
{
unsigned char *crt_start, *pk_start;
size_t crt_len, pk_len;
/* We parse the CRT chain without copying, so
* these pointers point into the input buffer,
* and are hence still valid after freeing the
* CRT chain. */
crt_start = chain->raw.p;
crt_len = chain->raw.len;
pk_start = chain->pk_raw.p;
pk_len = chain->pk_raw.len;
/* Free the CRT structures before computing
* digest and copying the peer's public key. */
mbedtls_x509_crt_free(chain);
mbedtls_free(chain);
chain = NULL;
ret = ssl_remember_peer_crt_digest(ssl, crt_start, crt_len);
if (ret != 0) {
goto exit;
}
ret = ssl_remember_peer_pubkey(ssl, pk_start, pk_len);
if (ret != 0) {
goto exit;
}
}
#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/* Pass ownership to session structure. */
ssl->session_negotiate->peer_cert = chain;
chain = NULL;
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
MBEDTLS_SSL_DEBUG_MSG(2, ("<= parse certificate"));
exit:
if (ret == 0) {
ssl->state++;
}
#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
if (ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS) {
ssl->handshake->ecrs_peer_cert = chain;
chain = NULL;
}
#endif
if (chain != NULL) {
mbedtls_x509_crt_free(chain);
mbedtls_free(chain);
}
return ret;
}
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
void mbedtls_ssl_optimize_checksum(mbedtls_ssl_context *ssl,
const mbedtls_ssl_ciphersuite_t *ciphersuite_info)
{
((void) ciphersuite_info);
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
if (ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3) {
ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
} else
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
if (ciphersuite_info->mac == MBEDTLS_MD_SHA384) {
ssl->handshake->update_checksum = ssl_update_checksum_sha384;
} else
#endif
#if defined(MBEDTLS_SHA256_C)
if (ciphersuite_info->mac != MBEDTLS_MD_SHA384) {
ssl->handshake->update_checksum = ssl_update_checksum_sha256;
} else
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
{
MBEDTLS_SSL_DEBUG_MSG(1, ("should never happen"));
return;
}
}
void mbedtls_ssl_reset_checksum(mbedtls_ssl_context *ssl)
{
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
mbedtls_md5_starts_ret(&ssl->handshake->fin_md5);
mbedtls_sha1_starts_ret(&ssl->handshake->fin_sha1);
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_abort(&ssl->handshake->fin_sha256_psa);
psa_hash_setup(&ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256);
#else
mbedtls_sha256_starts_ret(&ssl->handshake->fin_sha256, 0);
#endif
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_abort(&ssl->handshake->fin_sha384_psa);
psa_hash_setup(&ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384);
#else
mbedtls_sha512_starts_ret(&ssl->handshake->fin_sha512, 1);
#endif
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
}
static void ssl_update_checksum_start(mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len)
{
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
mbedtls_md5_update_ret(&ssl->handshake->fin_md5, buf, len);
mbedtls_sha1_update_ret(&ssl->handshake->fin_sha1, buf, len);
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update(&ssl->handshake->fin_sha256_psa, buf, len);
#else
mbedtls_sha256_update_ret(&ssl->handshake->fin_sha256, buf, len);
#endif
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update(&ssl->handshake->fin_sha384_psa, buf, len);
#else
mbedtls_sha512_update_ret(&ssl->handshake->fin_sha512, buf, len);
#endif
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
}
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
static void ssl_update_checksum_md5sha1(mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len)
{
mbedtls_md5_update_ret(&ssl->handshake->fin_md5, buf, len);
mbedtls_sha1_update_ret(&ssl->handshake->fin_sha1, buf, len);
}
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
static void ssl_update_checksum_sha256(mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len)
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update(&ssl->handshake->fin_sha256_psa, buf, len);
#else
mbedtls_sha256_update_ret(&ssl->handshake->fin_sha256, buf, len);
#endif
}
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
static void ssl_update_checksum_sha384(mbedtls_ssl_context *ssl,
const unsigned char *buf, size_t len)
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_update(&ssl->handshake->fin_sha384_psa, buf, len);
#else
mbedtls_sha512_update_ret(&ssl->handshake->fin_sha512, buf, len);
#endif
}
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
#if defined(MBEDTLS_SSL_PROTO_SSL3)
static void ssl_calc_finished_ssl(
mbedtls_ssl_context *ssl, unsigned char *buf, int from)
{
const char *sender;
mbedtls_md5_context md5;
mbedtls_sha1_context sha1;
unsigned char padbuf[48];
unsigned char md5sum[16];
unsigned char sha1sum[20];
mbedtls_ssl_session *session = ssl->session_negotiate;
if (!session) {
session = ssl->session;
}
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished ssl"));
mbedtls_md5_init(&md5);
mbedtls_sha1_init(&sha1);
mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5);
mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1);
/*
* SSLv3:
* hash =
* MD5( master + pad2 +
* MD5( handshake + sender + master + pad1 ) )
* + SHA1( master + pad2 +
* SHA1( handshake + sender + master + pad1 ) )
*/
#if !defined(MBEDTLS_MD5_ALT)
MBEDTLS_SSL_DEBUG_BUF(4, "finished md5 state", (unsigned char *)
md5.state, sizeof(md5.state));
#endif
#if !defined(MBEDTLS_SHA1_ALT)
MBEDTLS_SSL_DEBUG_BUF(4, "finished sha1 state", (unsigned char *)
sha1.state, sizeof(sha1.state));
#endif
sender = (from == MBEDTLS_SSL_IS_CLIENT) ? "CLNT"
: "SRVR";
memset(padbuf, 0x36, 48);
mbedtls_md5_update_ret(&md5, (const unsigned char *) sender, 4);
mbedtls_md5_update_ret(&md5, session->master, 48);
mbedtls_md5_update_ret(&md5, padbuf, 48);
mbedtls_md5_finish_ret(&md5, md5sum);
mbedtls_sha1_update_ret(&sha1, (const unsigned char *) sender, 4);
mbedtls_sha1_update_ret(&sha1, session->master, 48);
mbedtls_sha1_update_ret(&sha1, padbuf, 40);
mbedtls_sha1_finish_ret(&sha1, sha1sum);
memset(padbuf, 0x5C, 48);
mbedtls_md5_starts_ret(&md5);
mbedtls_md5_update_ret(&md5, session->master, 48);
mbedtls_md5_update_ret(&md5, padbuf, 48);
mbedtls_md5_update_ret(&md5, md5sum, 16);
mbedtls_md5_finish_ret(&md5, buf);
mbedtls_sha1_starts_ret(&sha1);
mbedtls_sha1_update_ret(&sha1, session->master, 48);
mbedtls_sha1_update_ret(&sha1, padbuf, 40);
mbedtls_sha1_update_ret(&sha1, sha1sum, 20);
mbedtls_sha1_finish_ret(&sha1, buf + 16);
MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, 36);
mbedtls_md5_free(&md5);
mbedtls_sha1_free(&sha1);
mbedtls_platform_zeroize(padbuf, sizeof(padbuf));
mbedtls_platform_zeroize(md5sum, sizeof(md5sum));
mbedtls_platform_zeroize(sha1sum, sizeof(sha1sum));
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished"));
}
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
static void ssl_calc_finished_tls(
mbedtls_ssl_context *ssl, unsigned char *buf, int from)
{
int len = 12;
const char *sender;
mbedtls_md5_context md5;
mbedtls_sha1_context sha1;
unsigned char padbuf[36];
mbedtls_ssl_session *session = ssl->session_negotiate;
if (!session) {
session = ssl->session;
}
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls"));
mbedtls_md5_init(&md5);
mbedtls_sha1_init(&sha1);
mbedtls_md5_clone(&md5, &ssl->handshake->fin_md5);
mbedtls_sha1_clone(&sha1, &ssl->handshake->fin_sha1);
/*
* TLSv1:
* hash = PRF( master, finished_label,
* MD5( handshake ) + SHA1( handshake ) )[0..11]
*/
#if !defined(MBEDTLS_MD5_ALT)
MBEDTLS_SSL_DEBUG_BUF(4, "finished md5 state", (unsigned char *)
md5.state, sizeof(md5.state));
#endif
#if !defined(MBEDTLS_SHA1_ALT)
MBEDTLS_SSL_DEBUG_BUF(4, "finished sha1 state", (unsigned char *)
sha1.state, sizeof(sha1.state));
#endif
sender = (from == MBEDTLS_SSL_IS_CLIENT)
? "client finished"
: "server finished";
mbedtls_md5_finish_ret(&md5, padbuf);
mbedtls_sha1_finish_ret(&sha1, padbuf + 16);
ssl->handshake->tls_prf(session->master, 48, sender,
padbuf, 36, buf, len);
MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len);
mbedtls_md5_free(&md5);
mbedtls_sha1_free(&sha1);
mbedtls_platform_zeroize(padbuf, sizeof(padbuf));
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished"));
}
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
static void ssl_calc_finished_tls_sha256(
mbedtls_ssl_context *ssl, unsigned char *buf, int from)
{
int len = 12;
const char *sender;
unsigned char padbuf[32];
#if defined(MBEDTLS_USE_PSA_CRYPTO)
size_t hash_size;
psa_hash_operation_t sha256_psa = PSA_HASH_OPERATION_INIT;
psa_status_t status;
#else
mbedtls_sha256_context sha256;
#endif
mbedtls_ssl_session *session = ssl->session_negotiate;
if (!session) {
session = ssl->session;
}
sender = (from == MBEDTLS_SSL_IS_CLIENT)
? "client finished"
: "server finished";
#if defined(MBEDTLS_USE_PSA_CRYPTO)
sha256_psa = psa_hash_operation_init();
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc PSA finished tls sha256"));
status = psa_hash_clone(&ssl->handshake->fin_sha256_psa, &sha256_psa);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed"));
return;
}
status = psa_hash_finish(&sha256_psa, padbuf, sizeof(padbuf), &hash_size);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed"));
return;
}
MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated padbuf", padbuf, 32);
#else
mbedtls_sha256_init(&sha256);
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls sha256"));
mbedtls_sha256_clone(&sha256, &ssl->handshake->fin_sha256);
/*
* TLSv1.2:
* hash = PRF( master, finished_label,
* Hash( handshake ) )[0.11]
*/
#if !defined(MBEDTLS_SHA256_ALT)
MBEDTLS_SSL_DEBUG_BUF(4, "finished sha2 state", (unsigned char *)
sha256.state, sizeof(sha256.state));
#endif
mbedtls_sha256_finish_ret(&sha256, padbuf);
mbedtls_sha256_free(&sha256);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
ssl->handshake->tls_prf(session->master, 48, sender,
padbuf, 32, buf, len);
MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len);
mbedtls_platform_zeroize(padbuf, sizeof(padbuf));
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished"));
}
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
static void ssl_calc_finished_tls_sha384(
mbedtls_ssl_context *ssl, unsigned char *buf, int from)
{
int len = 12;
const char *sender;
unsigned char padbuf[48];
#if defined(MBEDTLS_USE_PSA_CRYPTO)
size_t hash_size;
psa_hash_operation_t sha384_psa = PSA_HASH_OPERATION_INIT;
psa_status_t status;
#else
mbedtls_sha512_context sha512;
#endif
mbedtls_ssl_session *session = ssl->session_negotiate;
if (!session) {
session = ssl->session;
}
sender = (from == MBEDTLS_SSL_IS_CLIENT)
? "client finished"
: "server finished";
#if defined(MBEDTLS_USE_PSA_CRYPTO)
sha384_psa = psa_hash_operation_init();
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc PSA finished tls sha384"));
status = psa_hash_clone(&ssl->handshake->fin_sha384_psa, &sha384_psa);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash clone failed"));
return;
}
status = psa_hash_finish(&sha384_psa, padbuf, sizeof(padbuf), &hash_size);
if (status != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_MSG(2, ("PSA hash finish failed"));
return;
}
MBEDTLS_SSL_DEBUG_BUF(3, "PSA calculated padbuf", padbuf, 48);
#else
mbedtls_sha512_init(&sha512);
MBEDTLS_SSL_DEBUG_MSG(2, ("=> calc finished tls sha384"));
mbedtls_sha512_clone(&sha512, &ssl->handshake->fin_sha512);
/*
* TLSv1.2:
* hash = PRF( master, finished_label,
* Hash( handshake ) )[0.11]
*/
#if !defined(MBEDTLS_SHA512_ALT)
MBEDTLS_SSL_DEBUG_BUF(4, "finished sha512 state", (unsigned char *)
sha512.state, sizeof(sha512.state));
#endif
/* mbedtls_sha512_finish_ret's output parameter is declared as a
* 64-byte buffer, but since we're using SHA-384, we know that the
* output fits in 48 bytes. This is correct C, but GCC 11.1 warns
* about it.
*/
#if defined(__GNUC__) && __GNUC__ >= 11
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstringop-overflow"
#endif
mbedtls_sha512_finish_ret(&sha512, padbuf);
#if defined(__GNUC__) && __GNUC__ >= 11
#pragma GCC diagnostic pop
#endif
mbedtls_sha512_free(&sha512);
#endif
ssl->handshake->tls_prf(session->master, 48, sender,
padbuf, 48, buf, len);
MBEDTLS_SSL_DEBUG_BUF(3, "calc finished result", buf, len);
mbedtls_platform_zeroize(padbuf, sizeof(padbuf));
MBEDTLS_SSL_DEBUG_MSG(2, ("<= calc finished"));
}
#endif /* MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384 */
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
void mbedtls_ssl_handshake_wrapup_free_hs_transform(mbedtls_ssl_context *ssl)
{
MBEDTLS_SSL_DEBUG_MSG(3, ("=> handshake wrapup: final free"));
/*
* Free our handshake params
*/
mbedtls_ssl_handshake_free(ssl);
mbedtls_free(ssl->handshake);
ssl->handshake = NULL;
/*
* Free the previous transform and switch in the current one
*/
if (ssl->transform) {
mbedtls_ssl_transform_free(ssl->transform);
mbedtls_free(ssl->transform);
}
ssl->transform = ssl->transform_negotiate;
ssl->transform_negotiate = NULL;
MBEDTLS_SSL_DEBUG_MSG(3, ("<= handshake wrapup: final free"));
}
void mbedtls_ssl_handshake_wrapup(mbedtls_ssl_context *ssl)
{
int resume = ssl->handshake->resume;
MBEDTLS_SSL_DEBUG_MSG(3, ("=> handshake wrapup"));
#if defined(MBEDTLS_SSL_RENEGOTIATION)
if (ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) {
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
ssl->renego_records_seen = 0;
}
#endif
/*
* Free the previous session and switch in the current one
*/
if (ssl->session) {
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
/* RFC 7366 3.1: keep the EtM state */
ssl->session_negotiate->encrypt_then_mac =
ssl->session->encrypt_then_mac;
#endif
mbedtls_ssl_session_free(ssl->session);
mbedtls_free(ssl->session);
}
ssl->session = ssl->session_negotiate;
ssl->session_negotiate = NULL;
/*
* Add cache entry
*/
if (ssl->conf->f_set_cache != NULL &&
ssl->session->id_len != 0 &&
resume == 0) {
if (ssl->conf->f_set_cache(ssl->conf->p_cache, ssl->session) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("cache did not store session"));
}
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
ssl->handshake->flight != NULL) {
/* Cancel handshake timer */
mbedtls_ssl_set_timer(ssl, 0);
/* Keep last flight around in case we need to resend it:
* we need the handshake and transform structures for that */
MBEDTLS_SSL_DEBUG_MSG(3, ("skip freeing handshake and transform"));
} else
#endif
mbedtls_ssl_handshake_wrapup_free_hs_transform(ssl);
ssl->state++;
MBEDTLS_SSL_DEBUG_MSG(3, ("<= handshake wrapup"));
}
int mbedtls_ssl_write_finished(mbedtls_ssl_context *ssl)
{
int ret, hash_len;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> write finished"));
mbedtls_ssl_update_out_pointers(ssl, ssl->transform_negotiate);
ssl->handshake->calc_finished(ssl, ssl->out_msg + 4, ssl->conf->endpoint);
/*
* RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites
* may define some other value. Currently (early 2016), no defined
* ciphersuite does this (and this is unlikely to change as activity has
* moved to TLS 1.3 now) so we can keep the hardcoded 12 here.
*/
hash_len = (ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) ? 36 : 12;
#if defined(MBEDTLS_SSL_RENEGOTIATION)
ssl->verify_data_len = hash_len;
memcpy(ssl->own_verify_data, ssl->out_msg + 4, hash_len);
#endif
ssl->out_msglen = 4 + hash_len;
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
/*
* In case of session resuming, invert the client and server
* ChangeCipherSpec messages order.
*/
if (ssl->handshake->resume != 0) {
#if defined(MBEDTLS_SSL_CLI_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
}
#endif
#if defined(MBEDTLS_SSL_SRV_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
}
#endif
} else {
ssl->state++;
}
/*
* Switch to our negotiated transform and session parameters for outbound
* data.
*/
MBEDTLS_SSL_DEBUG_MSG(3, ("switching to new transform spec for outbound data"));
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
unsigned char i;
/* Remember current epoch settings for resending */
ssl->handshake->alt_transform_out = ssl->transform_out;
memcpy(ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, 8);
/* Set sequence_number to zero */
memset(ssl->cur_out_ctr + 2, 0, 6);
/* Increment epoch */
for (i = 2; i > 0; i--) {
if (++ssl->cur_out_ctr[i - 1] != 0) {
break;
}
}
/* The loop goes to its end iff the counter is wrapping */
if (i == 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("DTLS epoch would wrap"));
return MBEDTLS_ERR_SSL_COUNTER_WRAPPING;
}
} else
#endif /* MBEDTLS_SSL_PROTO_DTLS */
memset(ssl->cur_out_ctr, 0, 8);
ssl->transform_out = ssl->transform_negotiate;
ssl->session_out = ssl->session_negotiate;
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
if (mbedtls_ssl_hw_record_activate != NULL) {
if ((ret = mbedtls_ssl_hw_record_activate(ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_hw_record_activate", ret);
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
}
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
mbedtls_ssl_send_flight_completed(ssl);
}
#endif
if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret);
return ret;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
(ret = mbedtls_ssl_flight_transmit(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_flight_transmit", ret);
return ret;
}
#endif
MBEDTLS_SSL_DEBUG_MSG(2, ("<= write finished"));
return 0;
}
#if defined(MBEDTLS_SSL_PROTO_SSL3)
#define SSL_MAX_HASH_LEN 36
#else
#define SSL_MAX_HASH_LEN 12
#endif
int mbedtls_ssl_parse_finished(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned int hash_len;
unsigned char buf[SSL_MAX_HASH_LEN];
MBEDTLS_SSL_DEBUG_MSG(2, ("=> parse finished"));
/* There is currently no ciphersuite using another length with TLS 1.2 */
#if defined(MBEDTLS_SSL_PROTO_SSL3)
if (ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0) {
hash_len = 36;
} else
#endif
hash_len = 12;
ssl->handshake->calc_finished(ssl, buf, ssl->conf->endpoint ^ 1);
if ((ret = mbedtls_ssl_read_record(ssl, 1)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_read_record", ret);
goto exit;
}
if (ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE);
ret = MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE;
goto exit;
}
if (ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
ssl->in_hslen != mbedtls_ssl_hs_hdr_len(ssl) + hash_len) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR);
ret = MBEDTLS_ERR_SSL_BAD_HS_FINISHED;
goto exit;
}
if (mbedtls_ct_memcmp(ssl->in_msg + mbedtls_ssl_hs_hdr_len(ssl),
buf, hash_len) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("bad finished message"));
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR);
ret = MBEDTLS_ERR_SSL_BAD_HS_FINISHED;
goto exit;
}
#if defined(MBEDTLS_SSL_RENEGOTIATION)
ssl->verify_data_len = hash_len;
memcpy(ssl->peer_verify_data, buf, hash_len);
#endif
if (ssl->handshake->resume != 0) {
#if defined(MBEDTLS_SSL_CLI_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
}
#endif
#if defined(MBEDTLS_SSL_SRV_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
}
#endif
} else {
ssl->state++;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
mbedtls_ssl_recv_flight_completed(ssl);
}
#endif
MBEDTLS_SSL_DEBUG_MSG(2, ("<= parse finished"));
exit:
mbedtls_platform_zeroize(buf, hash_len);
return ret;
}
static void ssl_handshake_params_init(mbedtls_ssl_handshake_params *handshake)
{
memset(handshake, 0, sizeof(mbedtls_ssl_handshake_params));
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
mbedtls_md5_init(&handshake->fin_md5);
mbedtls_sha1_init(&handshake->fin_sha1);
mbedtls_md5_starts_ret(&handshake->fin_md5);
mbedtls_sha1_starts_ret(&handshake->fin_sha1);
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
handshake->fin_sha256_psa = psa_hash_operation_init();
psa_hash_setup(&handshake->fin_sha256_psa, PSA_ALG_SHA_256);
#else
mbedtls_sha256_init(&handshake->fin_sha256);
mbedtls_sha256_starts_ret(&handshake->fin_sha256, 0);
#endif
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
handshake->fin_sha384_psa = psa_hash_operation_init();
psa_hash_setup(&handshake->fin_sha384_psa, PSA_ALG_SHA_384);
#else
mbedtls_sha512_init(&handshake->fin_sha512);
mbedtls_sha512_starts_ret(&handshake->fin_sha512, 1);
#endif
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
handshake->update_checksum = ssl_update_checksum_start;
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
mbedtls_ssl_sig_hash_set_init(&handshake->hash_algs);
#endif
#if defined(MBEDTLS_DHM_C)
mbedtls_dhm_init(&handshake->dhm_ctx);
#endif
#if defined(MBEDTLS_ECDH_C)
mbedtls_ecdh_init(&handshake->ecdh_ctx);
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
mbedtls_ecjpake_init(&handshake->ecjpake_ctx);
#if defined(MBEDTLS_SSL_CLI_C)
handshake->ecjpake_cache = NULL;
handshake->ecjpake_cache_len = 0;
#endif
#endif
#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
mbedtls_x509_crt_restart_init(&handshake->ecrs_ctx);
#endif
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
!defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_pk_init(&handshake->peer_pubkey);
#endif
}
void mbedtls_ssl_transform_init(mbedtls_ssl_transform *transform)
{
memset(transform, 0, sizeof(mbedtls_ssl_transform));
mbedtls_cipher_init(&transform->cipher_ctx_enc);
mbedtls_cipher_init(&transform->cipher_ctx_dec);
#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
mbedtls_md_init(&transform->md_ctx_enc);
mbedtls_md_init(&transform->md_ctx_dec);
#endif
}
void mbedtls_ssl_session_init(mbedtls_ssl_session *session)
{
memset(session, 0, sizeof(mbedtls_ssl_session));
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_handshake_init(mbedtls_ssl_context *ssl)
{
/* Clear old handshake information if present */
if (ssl->transform_negotiate) {
mbedtls_ssl_transform_free(ssl->transform_negotiate);
}
if (ssl->session_negotiate) {
mbedtls_ssl_session_free(ssl->session_negotiate);
}
if (ssl->handshake) {
mbedtls_ssl_handshake_free(ssl);
}
/*
* Either the pointers are now NULL or cleared properly and can be freed.
* Now allocate missing structures.
*/
if (ssl->transform_negotiate == NULL) {
ssl->transform_negotiate = mbedtls_calloc(1, sizeof(mbedtls_ssl_transform));
}
if (ssl->session_negotiate == NULL) {
ssl->session_negotiate = mbedtls_calloc(1, sizeof(mbedtls_ssl_session));
}
if (ssl->handshake == NULL) {
ssl->handshake = mbedtls_calloc(1, sizeof(mbedtls_ssl_handshake_params));
}
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
/* If the buffers are too small - reallocate */
handle_buffer_resizing(ssl, 0, MBEDTLS_SSL_IN_BUFFER_LEN,
MBEDTLS_SSL_OUT_BUFFER_LEN);
#endif
/* All pointers should exist and can be directly freed without issue */
if (ssl->handshake == NULL ||
ssl->transform_negotiate == NULL ||
ssl->session_negotiate == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("alloc() of ssl sub-contexts failed"));
mbedtls_free(ssl->handshake);
mbedtls_free(ssl->transform_negotiate);
mbedtls_free(ssl->session_negotiate);
ssl->handshake = NULL;
ssl->transform_negotiate = NULL;
ssl->session_negotiate = NULL;
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
/* Initialize structures */
mbedtls_ssl_session_init(ssl->session_negotiate);
mbedtls_ssl_transform_init(ssl->transform_negotiate);
ssl_handshake_params_init(ssl->handshake);
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
ssl->handshake->alt_transform_out = ssl->transform_out;
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
} else {
ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
}
mbedtls_ssl_set_timer(ssl, 0);
}
#endif
return 0;
}
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
/* Dummy cookie callbacks for defaults */
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_cookie_write_dummy(void *ctx,
unsigned char **p, unsigned char *end,
const unsigned char *cli_id, size_t cli_id_len)
{
((void) ctx);
((void) p);
((void) end);
((void) cli_id);
((void) cli_id_len);
return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
}
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_cookie_check_dummy(void *ctx,
const unsigned char *cookie, size_t cookie_len,
const unsigned char *cli_id, size_t cli_id_len)
{
((void) ctx);
((void) cookie);
((void) cookie_len);
((void) cli_id);
((void) cli_id_len);
return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
/*
* Initialize an SSL context
*/
void mbedtls_ssl_init(mbedtls_ssl_context *ssl)
{
memset(ssl, 0, sizeof(mbedtls_ssl_context));
}
/*
* Setup an SSL context
*/
int mbedtls_ssl_setup(mbedtls_ssl_context *ssl,
const mbedtls_ssl_config *conf)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
ssl->conf = conf;
/*
* Prepare base structures
*/
/* Set to NULL in case of an error condition */
ssl->out_buf = NULL;
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
ssl->in_buf_len = in_buf_len;
#endif
ssl->in_buf = mbedtls_calloc(1, in_buf_len);
if (ssl->in_buf == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", in_buf_len));
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto error;
}
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
ssl->out_buf_len = out_buf_len;
#endif
ssl->out_buf = mbedtls_calloc(1, out_buf_len);
if (ssl->out_buf == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("alloc(%" MBEDTLS_PRINTF_SIZET " bytes) failed", out_buf_len));
ret = MBEDTLS_ERR_SSL_ALLOC_FAILED;
goto error;
}
mbedtls_ssl_reset_in_out_pointers(ssl);
#if defined(MBEDTLS_SSL_DTLS_SRTP)
memset(&ssl->dtls_srtp_info, 0, sizeof(ssl->dtls_srtp_info));
#endif
if ((ret = ssl_handshake_init(ssl)) != 0) {
goto error;
}
return 0;
error:
mbedtls_free(ssl->in_buf);
mbedtls_free(ssl->out_buf);
ssl->conf = NULL;
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
ssl->in_buf_len = 0;
ssl->out_buf_len = 0;
#endif
ssl->in_buf = NULL;
ssl->out_buf = NULL;
ssl->in_hdr = NULL;
ssl->in_ctr = NULL;
ssl->in_len = NULL;
ssl->in_iv = NULL;
ssl->in_msg = NULL;
ssl->out_hdr = NULL;
ssl->out_ctr = NULL;
ssl->out_len = NULL;
ssl->out_iv = NULL;
ssl->out_msg = NULL;
return ret;
}
/*
* Reset an initialized and used SSL context for re-use while retaining
* all application-set variables, function pointers and data.
*
* If partial is non-zero, keep data in the input buffer and client ID.
* (Use when a DTLS client reconnects from the same port.)
*/
int mbedtls_ssl_session_reset_int(mbedtls_ssl_context *ssl, int partial)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
size_t in_buf_len = ssl->in_buf_len;
size_t out_buf_len = ssl->out_buf_len;
#else
size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
#endif
#if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || \
!defined(MBEDTLS_SSL_SRV_C)
((void) partial);
#endif
ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
/* Cancel any possibly running timer */
mbedtls_ssl_set_timer(ssl, 0);
#if defined(MBEDTLS_SSL_RENEGOTIATION)
ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
ssl->renego_records_seen = 0;
ssl->verify_data_len = 0;
memset(ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN);
memset(ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN);
#endif
ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
ssl->in_offt = NULL;
mbedtls_ssl_reset_in_out_pointers(ssl);
ssl->in_msgtype = 0;
ssl->in_msglen = 0;
#if defined(MBEDTLS_SSL_PROTO_DTLS)
ssl->next_record_offset = 0;
ssl->in_epoch = 0;
#endif
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
mbedtls_ssl_dtls_replay_reset(ssl);
#endif
ssl->in_hslen = 0;
ssl->nb_zero = 0;
ssl->keep_current_message = 0;
ssl->out_msgtype = 0;
ssl->out_msglen = 0;
ssl->out_left = 0;
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
if (ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED) {
ssl->split_done = 0;
}
#endif
memset(ssl->cur_out_ctr, 0, sizeof(ssl->cur_out_ctr));
ssl->transform_in = NULL;
ssl->transform_out = NULL;
ssl->session_in = NULL;
ssl->session_out = NULL;
memset(ssl->out_buf, 0, out_buf_len);
int clear_in_buf = 1;
#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
if (partial != 0) {
clear_in_buf = 0;
}
#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
if (clear_in_buf) {
ssl->in_left = 0;
memset(ssl->in_buf, 0, in_buf_len);
}
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
if (mbedtls_ssl_hw_record_reset != NULL) {
MBEDTLS_SSL_DEBUG_MSG(2, ("going for mbedtls_ssl_hw_record_reset()"));
if ((ret = mbedtls_ssl_hw_record_reset(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_hw_record_reset", ret);
return MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
}
}
#endif
if (ssl->transform) {
mbedtls_ssl_transform_free(ssl->transform);
mbedtls_free(ssl->transform);
ssl->transform = NULL;
}
if (ssl->session) {
mbedtls_ssl_session_free(ssl->session);
mbedtls_free(ssl->session);
ssl->session = NULL;
}
#if defined(MBEDTLS_SSL_ALPN)
ssl->alpn_chosen = NULL;
#endif
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
int free_cli_id = 1;
#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE)
if (partial != 0) {
free_cli_id = 0;
}
#endif
if (free_cli_id) {
mbedtls_free(ssl->cli_id);
ssl->cli_id = NULL;
ssl->cli_id_len = 0;
}
#endif
if ((ret = ssl_handshake_init(ssl)) != 0) {
return ret;
}
return 0;
}
/*
* Reset an initialized and used SSL context for re-use while retaining
* all application-set variables, function pointers and data.
*/
int mbedtls_ssl_session_reset(mbedtls_ssl_context *ssl)
{
return mbedtls_ssl_session_reset_int(ssl, 0);
}
/*
* SSL set accessors
*/
void mbedtls_ssl_conf_endpoint(mbedtls_ssl_config *conf, int endpoint)
{
conf->endpoint = endpoint;
}
void mbedtls_ssl_conf_transport(mbedtls_ssl_config *conf, int transport)
{
conf->transport = transport;
}
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
void mbedtls_ssl_conf_dtls_anti_replay(mbedtls_ssl_config *conf, char mode)
{
conf->anti_replay = mode;
}
#endif
#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
void mbedtls_ssl_conf_dtls_badmac_limit(mbedtls_ssl_config *conf, unsigned limit)
{
conf->badmac_limit = limit;
}
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
void mbedtls_ssl_set_datagram_packing(mbedtls_ssl_context *ssl,
unsigned allow_packing)
{
ssl->disable_datagram_packing = !allow_packing;
}
void mbedtls_ssl_conf_handshake_timeout(mbedtls_ssl_config *conf,
uint32_t min, uint32_t max)
{
conf->hs_timeout_min = min;
conf->hs_timeout_max = max;
}
#endif
void mbedtls_ssl_conf_authmode(mbedtls_ssl_config *conf, int authmode)
{
conf->authmode = authmode;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
void mbedtls_ssl_conf_verify(mbedtls_ssl_config *conf,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy)
{
conf->f_vrfy = f_vrfy;
conf->p_vrfy = p_vrfy;
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_ssl_conf_rng(mbedtls_ssl_config *conf,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
conf->f_rng = f_rng;
conf->p_rng = p_rng;
}
void mbedtls_ssl_conf_dbg(mbedtls_ssl_config *conf,
void (*f_dbg)(void *, int, const char *, int, const char *),
void *p_dbg)
{
conf->f_dbg = f_dbg;
conf->p_dbg = p_dbg;
}
void mbedtls_ssl_set_bio(mbedtls_ssl_context *ssl,
void *p_bio,
mbedtls_ssl_send_t *f_send,
mbedtls_ssl_recv_t *f_recv,
mbedtls_ssl_recv_timeout_t *f_recv_timeout)
{
ssl->p_bio = p_bio;
ssl->f_send = f_send;
ssl->f_recv = f_recv;
ssl->f_recv_timeout = f_recv_timeout;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
void mbedtls_ssl_set_mtu(mbedtls_ssl_context *ssl, uint16_t mtu)
{
ssl->mtu = mtu;
}
#endif
void mbedtls_ssl_conf_read_timeout(mbedtls_ssl_config *conf, uint32_t timeout)
{
conf->read_timeout = timeout;
}
void mbedtls_ssl_set_timer_cb(mbedtls_ssl_context *ssl,
void *p_timer,
mbedtls_ssl_set_timer_t *f_set_timer,
mbedtls_ssl_get_timer_t *f_get_timer)
{
ssl->p_timer = p_timer;
ssl->f_set_timer = f_set_timer;
ssl->f_get_timer = f_get_timer;
/* Make sure we start with no timer running */
mbedtls_ssl_set_timer(ssl, 0);
}
#if defined(MBEDTLS_SSL_SRV_C)
void mbedtls_ssl_conf_session_cache(mbedtls_ssl_config *conf,
void *p_cache,
int (*f_get_cache)(void *, mbedtls_ssl_session *),
int (*f_set_cache)(void *, const mbedtls_ssl_session *))
{
conf->p_cache = p_cache;
conf->f_get_cache = f_get_cache;
conf->f_set_cache = f_set_cache;
}
#endif /* MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_SSL_CLI_C)
int mbedtls_ssl_set_session(mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (ssl == NULL ||
session == NULL ||
ssl->session_negotiate == NULL ||
ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if ((ret = mbedtls_ssl_session_copy(ssl->session_negotiate,
session)) != 0) {
return ret;
}
ssl->handshake->resume = 1;
return 0;
}
#endif /* MBEDTLS_SSL_CLI_C */
void mbedtls_ssl_conf_ciphersuites(mbedtls_ssl_config *conf,
const int *ciphersuites)
{
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
}
void mbedtls_ssl_conf_ciphersuites_for_version(mbedtls_ssl_config *conf,
const int *ciphersuites,
int major, int minor)
{
if (major != MBEDTLS_SSL_MAJOR_VERSION_3) {
return;
}
if (minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3) {
return;
}
conf->ciphersuite_list[minor] = ciphersuites;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
void mbedtls_ssl_conf_cert_profile(mbedtls_ssl_config *conf,
const mbedtls_x509_crt_profile *profile)
{
conf->cert_profile = profile;
}
/* Append a new keycert entry to a (possibly empty) list */
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_append_key_cert(mbedtls_ssl_key_cert **head,
mbedtls_x509_crt *cert,
mbedtls_pk_context *key)
{
mbedtls_ssl_key_cert *new_cert;
new_cert = mbedtls_calloc(1, sizeof(mbedtls_ssl_key_cert));
if (new_cert == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
new_cert->cert = cert;
new_cert->key = key;
new_cert->next = NULL;
/* Update head is the list was null, else add to the end */
if (*head == NULL) {
*head = new_cert;
} else {
mbedtls_ssl_key_cert *cur = *head;
while (cur->next != NULL) {
cur = cur->next;
}
cur->next = new_cert;
}
return 0;
}
int mbedtls_ssl_conf_own_cert(mbedtls_ssl_config *conf,
mbedtls_x509_crt *own_cert,
mbedtls_pk_context *pk_key)
{
return ssl_append_key_cert(&conf->key_cert, own_cert, pk_key);
}
void mbedtls_ssl_conf_ca_chain(mbedtls_ssl_config *conf,
mbedtls_x509_crt *ca_chain,
mbedtls_x509_crl *ca_crl)
{
conf->ca_chain = ca_chain;
conf->ca_crl = ca_crl;
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
/* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
* cannot be used together. */
conf->f_ca_cb = NULL;
conf->p_ca_cb = NULL;
#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
}
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
void mbedtls_ssl_conf_ca_cb(mbedtls_ssl_config *conf,
mbedtls_x509_crt_ca_cb_t f_ca_cb,
void *p_ca_cb)
{
conf->f_ca_cb = f_ca_cb;
conf->p_ca_cb = p_ca_cb;
/* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb()
* cannot be used together. */
conf->ca_chain = NULL;
conf->ca_crl = NULL;
}
#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
int mbedtls_ssl_set_hs_own_cert(mbedtls_ssl_context *ssl,
mbedtls_x509_crt *own_cert,
mbedtls_pk_context *pk_key)
{
return ssl_append_key_cert(&ssl->handshake->sni_key_cert,
own_cert, pk_key);
}
void mbedtls_ssl_set_hs_ca_chain(mbedtls_ssl_context *ssl,
mbedtls_x509_crt *ca_chain,
mbedtls_x509_crl *ca_crl)
{
ssl->handshake->sni_ca_chain = ca_chain;
ssl->handshake->sni_ca_crl = ca_crl;
}
void mbedtls_ssl_set_hs_authmode(mbedtls_ssl_context *ssl,
int authmode)
{
ssl->handshake->sni_authmode = authmode;
}
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
void mbedtls_ssl_set_verify(mbedtls_ssl_context *ssl,
int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
void *p_vrfy)
{
ssl->f_vrfy = f_vrfy;
ssl->p_vrfy = p_vrfy;
}
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
/*
* Set EC J-PAKE password for current handshake
*/
int mbedtls_ssl_set_hs_ecjpake_password(mbedtls_ssl_context *ssl,
const unsigned char *pw,
size_t pw_len)
{
mbedtls_ecjpake_role role;
if (ssl->handshake == NULL || ssl->conf == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
role = MBEDTLS_ECJPAKE_SERVER;
} else {
role = MBEDTLS_ECJPAKE_CLIENT;
}
return mbedtls_ecjpake_setup(&ssl->handshake->ecjpake_ctx,
role,
MBEDTLS_MD_SHA256,
MBEDTLS_ECP_DP_SECP256R1,
pw, pw_len);
}
#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
static void ssl_conf_remove_psk(mbedtls_ssl_config *conf)
{
/* Remove reference to existing PSK, if any. */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (!mbedtls_svc_key_id_is_null(conf->psk_opaque)) {
/* The maintenance of the PSK key slot is the
* user's responsibility. */
conf->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT;
}
/* This and the following branch should never
* be taken simultaneously as we maintain the
* invariant that raw and opaque PSKs are never
* configured simultaneously. As a safeguard,
* though, `else` is omitted here. */
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if (conf->psk != NULL) {
mbedtls_platform_zeroize(conf->psk, conf->psk_len);
mbedtls_free(conf->psk);
conf->psk = NULL;
conf->psk_len = 0;
}
/* Remove reference to PSK identity, if any. */
if (conf->psk_identity != NULL) {
mbedtls_free(conf->psk_identity);
conf->psk_identity = NULL;
conf->psk_identity_len = 0;
}
}
/* This function assumes that PSK identity in the SSL config is unset.
* It checks that the provided identity is well-formed and attempts
* to make a copy of it in the SSL config.
* On failure, the PSK identity in the config remains unset. */
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_conf_set_psk_identity(mbedtls_ssl_config *conf,
unsigned char const *psk_identity,
size_t psk_identity_len)
{
/* Identity len will be encoded on two bytes */
if (psk_identity == NULL ||
(psk_identity_len >> 16) != 0 ||
psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
conf->psk_identity = mbedtls_calloc(1, psk_identity_len);
if (conf->psk_identity == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
conf->psk_identity_len = psk_identity_len;
memcpy(conf->psk_identity, psk_identity, conf->psk_identity_len);
return 0;
}
int mbedtls_ssl_conf_psk(mbedtls_ssl_config *conf,
const unsigned char *psk, size_t psk_len,
const unsigned char *psk_identity, size_t psk_identity_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* Remove opaque/raw PSK + PSK Identity */
ssl_conf_remove_psk(conf);
/* Check and set raw PSK */
if (psk == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (psk_len == 0) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (psk_len > MBEDTLS_PSK_MAX_LEN) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if ((conf->psk = mbedtls_calloc(1, psk_len)) == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
conf->psk_len = psk_len;
memcpy(conf->psk, psk, conf->psk_len);
/* Check and set PSK Identity */
ret = ssl_conf_set_psk_identity(conf, psk_identity, psk_identity_len);
if (ret != 0) {
ssl_conf_remove_psk(conf);
}
return ret;
}
static void ssl_remove_psk(mbedtls_ssl_context *ssl)
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (!mbedtls_svc_key_id_is_null(ssl->handshake->psk_opaque)) {
ssl->handshake->psk_opaque = MBEDTLS_SVC_KEY_ID_INIT;
} else
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if (ssl->handshake->psk != NULL) {
mbedtls_platform_zeroize(ssl->handshake->psk,
ssl->handshake->psk_len);
mbedtls_free(ssl->handshake->psk);
ssl->handshake->psk_len = 0;
}
}
int mbedtls_ssl_set_hs_psk(mbedtls_ssl_context *ssl,
const unsigned char *psk, size_t psk_len)
{
if (psk == NULL || ssl->handshake == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (psk_len > MBEDTLS_PSK_MAX_LEN) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl_remove_psk(ssl);
if ((ssl->handshake->psk = mbedtls_calloc(1, psk_len)) == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
ssl->handshake->psk_len = psk_len;
memcpy(ssl->handshake->psk, psk, ssl->handshake->psk_len);
return 0;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int mbedtls_ssl_conf_psk_opaque(mbedtls_ssl_config *conf,
psa_key_id_t psk,
const unsigned char *psk_identity,
size_t psk_identity_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* Clear opaque/raw PSK + PSK Identity, if present. */
ssl_conf_remove_psk(conf);
/* Check and set opaque PSK */
if (mbedtls_svc_key_id_is_null(psk)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
conf->psk_opaque = psk;
/* Check and set PSK Identity */
ret = ssl_conf_set_psk_identity(conf, psk_identity,
psk_identity_len);
if (ret != 0) {
ssl_conf_remove_psk(conf);
}
return ret;
}
int mbedtls_ssl_set_hs_psk_opaque(mbedtls_ssl_context *ssl,
psa_key_id_t psk)
{
if ((mbedtls_svc_key_id_is_null(psk)) ||
(ssl->handshake == NULL)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl_remove_psk(ssl);
ssl->handshake->psk_opaque = psk;
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
void mbedtls_ssl_conf_psk_cb(mbedtls_ssl_config *conf,
int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
size_t),
void *p_psk)
{
conf->f_psk = f_psk;
conf->p_psk = p_psk;
}
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
int mbedtls_ssl_conf_dh_param(mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if ((ret = mbedtls_mpi_read_string(&conf->dhm_P, 16, dhm_P)) != 0 ||
(ret = mbedtls_mpi_read_string(&conf->dhm_G, 16, dhm_G)) != 0) {
mbedtls_mpi_free(&conf->dhm_P);
mbedtls_mpi_free(&conf->dhm_G);
return ret;
}
return 0;
}
#endif /* MBEDTLS_DEPRECATED_REMOVED */
int mbedtls_ssl_conf_dh_param_bin(mbedtls_ssl_config *conf,
const unsigned char *dhm_P, size_t P_len,
const unsigned char *dhm_G, size_t G_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi_free(&conf->dhm_P);
mbedtls_mpi_free(&conf->dhm_G);
if ((ret = mbedtls_mpi_read_binary(&conf->dhm_P, dhm_P, P_len)) != 0 ||
(ret = mbedtls_mpi_read_binary(&conf->dhm_G, dhm_G, G_len)) != 0) {
mbedtls_mpi_free(&conf->dhm_P);
mbedtls_mpi_free(&conf->dhm_G);
return ret;
}
return 0;
}
int mbedtls_ssl_conf_dh_param_ctx(mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_mpi_free(&conf->dhm_P);
mbedtls_mpi_free(&conf->dhm_G);
if ((ret = mbedtls_mpi_copy(&conf->dhm_P, &dhm_ctx->P)) != 0 ||
(ret = mbedtls_mpi_copy(&conf->dhm_G, &dhm_ctx->G)) != 0) {
mbedtls_mpi_free(&conf->dhm_P);
mbedtls_mpi_free(&conf->dhm_G);
return ret;
}
return 0;
}
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
/*
* Set the minimum length for Diffie-Hellman parameters
*/
void mbedtls_ssl_conf_dhm_min_bitlen(mbedtls_ssl_config *conf,
unsigned int bitlen)
{
conf->dhm_min_bitlen = bitlen;
}
#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/*
* Set allowed/preferred hashes for handshake signatures
*/
void mbedtls_ssl_conf_sig_hashes(mbedtls_ssl_config *conf,
const int *hashes)
{
conf->sig_hashes = hashes;
}
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
#if defined(MBEDTLS_ECP_C)
/*
* Set the allowed elliptic curves
*/
void mbedtls_ssl_conf_curves(mbedtls_ssl_config *conf,
const mbedtls_ecp_group_id *curve_list)
{
conf->curve_list = curve_list;
}
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
int mbedtls_ssl_set_hostname(mbedtls_ssl_context *ssl, const char *hostname)
{
/* Initialize to suppress unnecessary compiler warning */
size_t hostname_len = 0;
/* Check if new hostname is valid before
* making any change to current one */
if (hostname != NULL) {
hostname_len = strlen(hostname);
if (hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
}
/* Now it's clear that we will overwrite the old hostname,
* so we can free it safely */
if (ssl->hostname != NULL) {
mbedtls_platform_zeroize(ssl->hostname, strlen(ssl->hostname));
mbedtls_free(ssl->hostname);
}
/* Passing NULL as hostname shall clear the old one */
if (hostname == NULL) {
ssl->hostname = NULL;
} else {
ssl->hostname = mbedtls_calloc(1, hostname_len + 1);
if (ssl->hostname == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
memcpy(ssl->hostname, hostname, hostname_len);
ssl->hostname[hostname_len] = '\0';
}
return 0;
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
void mbedtls_ssl_conf_sni(mbedtls_ssl_config *conf,
int (*f_sni)(void *, mbedtls_ssl_context *,
const unsigned char *, size_t),
void *p_sni)
{
conf->f_sni = f_sni;
conf->p_sni = p_sni;
}
#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined(MBEDTLS_SSL_ALPN)
int mbedtls_ssl_conf_alpn_protocols(mbedtls_ssl_config *conf, const char **protos)
{
size_t cur_len, tot_len;
const char **p;
/*
* RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings
* MUST NOT be truncated."
* We check lengths now rather than later.
*/
tot_len = 0;
for (p = protos; *p != NULL; p++) {
cur_len = strlen(*p);
tot_len += cur_len;
if ((cur_len == 0) ||
(cur_len > MBEDTLS_SSL_MAX_ALPN_NAME_LEN) ||
(tot_len > MBEDTLS_SSL_MAX_ALPN_LIST_LEN)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
}
conf->alpn_list = protos;
return 0;
}
const char *mbedtls_ssl_get_alpn_protocol(const mbedtls_ssl_context *ssl)
{
return ssl->alpn_chosen;
}
#endif /* MBEDTLS_SSL_ALPN */
#if defined(MBEDTLS_SSL_DTLS_SRTP)
void mbedtls_ssl_conf_srtp_mki_value_supported(mbedtls_ssl_config *conf,
int support_mki_value)
{
conf->dtls_srtp_mki_support = support_mki_value;
}
int mbedtls_ssl_dtls_srtp_set_mki_value(mbedtls_ssl_context *ssl,
unsigned char *mki_value,
uint16_t mki_len)
{
if (mki_len > MBEDTLS_TLS_SRTP_MAX_MKI_LENGTH) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_UNSUPPORTED) {
return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
}
memcpy(ssl->dtls_srtp_info.mki_value, mki_value, mki_len);
ssl->dtls_srtp_info.mki_len = mki_len;
return 0;
}
int mbedtls_ssl_conf_dtls_srtp_protection_profiles(mbedtls_ssl_config *conf,
const mbedtls_ssl_srtp_profile *profiles)
{
const mbedtls_ssl_srtp_profile *p;
size_t list_size = 0;
/* check the profiles list: all entry must be valid,
* its size cannot be more than the total number of supported profiles, currently 4 */
for (p = profiles; *p != MBEDTLS_TLS_SRTP_UNSET &&
list_size <= MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH;
p++) {
if (mbedtls_ssl_check_srtp_profile_value(*p) != MBEDTLS_TLS_SRTP_UNSET) {
list_size++;
} else {
/* unsupported value, stop parsing and set the size to an error value */
list_size = MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH + 1;
}
}
if (list_size > MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH) {
conf->dtls_srtp_profile_list = NULL;
conf->dtls_srtp_profile_list_len = 0;
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
conf->dtls_srtp_profile_list = profiles;
conf->dtls_srtp_profile_list_len = list_size;
return 0;
}
void mbedtls_ssl_get_dtls_srtp_negotiation_result(const mbedtls_ssl_context *ssl,
mbedtls_dtls_srtp_info *dtls_srtp_info)
{
dtls_srtp_info->chosen_dtls_srtp_profile = ssl->dtls_srtp_info.chosen_dtls_srtp_profile;
/* do not copy the mki value if there is no chosen profile */
if (dtls_srtp_info->chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET) {
dtls_srtp_info->mki_len = 0;
} else {
dtls_srtp_info->mki_len = ssl->dtls_srtp_info.mki_len;
memcpy(dtls_srtp_info->mki_value, ssl->dtls_srtp_info.mki_value,
ssl->dtls_srtp_info.mki_len);
}
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */
void mbedtls_ssl_conf_max_version(mbedtls_ssl_config *conf, int major, int minor)
{
conf->max_major_ver = major;
conf->max_minor_ver = minor;
}
void mbedtls_ssl_conf_min_version(mbedtls_ssl_config *conf, int major, int minor)
{
conf->min_major_ver = major;
conf->min_minor_ver = minor;
}
#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
void mbedtls_ssl_conf_fallback(mbedtls_ssl_config *conf, char fallback)
{
conf->fallback = fallback;
}
#endif
#if defined(MBEDTLS_SSL_SRV_C)
void mbedtls_ssl_conf_cert_req_ca_list(mbedtls_ssl_config *conf,
char cert_req_ca_list)
{
conf->cert_req_ca_list = cert_req_ca_list;
}
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
void mbedtls_ssl_conf_encrypt_then_mac(mbedtls_ssl_config *conf, char etm)
{
conf->encrypt_then_mac = etm;
}
#endif
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
void mbedtls_ssl_conf_extended_master_secret(mbedtls_ssl_config *conf, char ems)
{
conf->extended_ms = ems;
}
#endif
#if defined(MBEDTLS_ARC4_C)
void mbedtls_ssl_conf_arc4_support(mbedtls_ssl_config *conf, char arc4)
{
conf->arc4_disabled = arc4;
}
#endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
int mbedtls_ssl_conf_max_frag_len(mbedtls_ssl_config *conf, unsigned char mfl_code)
{
if (mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
ssl_mfl_code_to_length(mfl_code) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
conf->mfl_code = mfl_code;
return 0;
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
void mbedtls_ssl_conf_truncated_hmac(mbedtls_ssl_config *conf, int truncate)
{
conf->trunc_hmac = truncate;
}
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
void mbedtls_ssl_conf_cbc_record_splitting(mbedtls_ssl_config *conf, char split)
{
conf->cbc_record_splitting = split;
}
#endif
void mbedtls_ssl_conf_legacy_renegotiation(mbedtls_ssl_config *conf, int allow_legacy)
{
conf->allow_legacy_renegotiation = allow_legacy;
}
#if defined(MBEDTLS_SSL_RENEGOTIATION)
void mbedtls_ssl_conf_renegotiation(mbedtls_ssl_config *conf, int renegotiation)
{
conf->disable_renegotiation = renegotiation;
}
void mbedtls_ssl_conf_renegotiation_enforced(mbedtls_ssl_config *conf, int max_records)
{
conf->renego_max_records = max_records;
}
void mbedtls_ssl_conf_renegotiation_period(mbedtls_ssl_config *conf,
const unsigned char period[8])
{
memcpy(conf->renego_period, period, 8);
}
#endif /* MBEDTLS_SSL_RENEGOTIATION */
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
#if defined(MBEDTLS_SSL_CLI_C)
void mbedtls_ssl_conf_session_tickets(mbedtls_ssl_config *conf, int use_tickets)
{
conf->session_tickets = use_tickets;
}
#endif
#if defined(MBEDTLS_SSL_SRV_C)
void mbedtls_ssl_conf_session_tickets_cb(mbedtls_ssl_config *conf,
mbedtls_ssl_ticket_write_t *f_ticket_write,
mbedtls_ssl_ticket_parse_t *f_ticket_parse,
void *p_ticket)
{
conf->f_ticket_write = f_ticket_write;
conf->f_ticket_parse = f_ticket_parse;
conf->p_ticket = p_ticket;
}
#endif
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_SSL_EXPORT_KEYS)
void mbedtls_ssl_conf_export_keys_cb(mbedtls_ssl_config *conf,
mbedtls_ssl_export_keys_t *f_export_keys,
void *p_export_keys)
{
conf->f_export_keys = f_export_keys;
conf->p_export_keys = p_export_keys;
}
void mbedtls_ssl_conf_export_keys_ext_cb(mbedtls_ssl_config *conf,
mbedtls_ssl_export_keys_ext_t *f_export_keys_ext,
void *p_export_keys)
{
conf->f_export_keys_ext = f_export_keys_ext;
conf->p_export_keys = p_export_keys;
}
#endif
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
void mbedtls_ssl_conf_async_private_cb(
mbedtls_ssl_config *conf,
mbedtls_ssl_async_sign_t *f_async_sign,
mbedtls_ssl_async_decrypt_t *f_async_decrypt,
mbedtls_ssl_async_resume_t *f_async_resume,
mbedtls_ssl_async_cancel_t *f_async_cancel,
void *async_config_data)
{
conf->f_async_sign_start = f_async_sign;
conf->f_async_decrypt_start = f_async_decrypt;
conf->f_async_resume = f_async_resume;
conf->f_async_cancel = f_async_cancel;
conf->p_async_config_data = async_config_data;
}
void *mbedtls_ssl_conf_get_async_config_data(const mbedtls_ssl_config *conf)
{
return conf->p_async_config_data;
}
void *mbedtls_ssl_get_async_operation_data(const mbedtls_ssl_context *ssl)
{
if (ssl->handshake == NULL) {
return NULL;
} else {
return ssl->handshake->user_async_ctx;
}
}
void mbedtls_ssl_set_async_operation_data(mbedtls_ssl_context *ssl,
void *ctx)
{
if (ssl->handshake != NULL) {
ssl->handshake->user_async_ctx = ctx;
}
}
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
/*
* SSL get accessors
*/
uint32_t mbedtls_ssl_get_verify_result(const mbedtls_ssl_context *ssl)
{
if (ssl->session != NULL) {
return ssl->session->verify_result;
}
if (ssl->session_negotiate != NULL) {
return ssl->session_negotiate->verify_result;
}
return 0xFFFFFFFF;
}
const char *mbedtls_ssl_get_ciphersuite(const mbedtls_ssl_context *ssl)
{
if (ssl == NULL || ssl->session == NULL) {
return NULL;
}
return mbedtls_ssl_get_ciphersuite_name(ssl->session->ciphersuite);
}
const char *mbedtls_ssl_get_version(const mbedtls_ssl_context *ssl)
{
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
switch (ssl->minor_ver) {
case MBEDTLS_SSL_MINOR_VERSION_2:
return "DTLSv1.0";
case MBEDTLS_SSL_MINOR_VERSION_3:
return "DTLSv1.2";
default:
return "unknown (DTLS)";
}
}
#endif
switch (ssl->minor_ver) {
case MBEDTLS_SSL_MINOR_VERSION_0:
return "SSLv3.0";
case MBEDTLS_SSL_MINOR_VERSION_1:
return "TLSv1.0";
case MBEDTLS_SSL_MINOR_VERSION_2:
return "TLSv1.1";
case MBEDTLS_SSL_MINOR_VERSION_3:
return "TLSv1.2";
default:
return "unknown";
}
}
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
size_t mbedtls_ssl_get_input_max_frag_len(const mbedtls_ssl_context *ssl)
{
size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN;
size_t read_mfl;
/* Use the configured MFL for the client if we're past SERVER_HELLO_DONE */
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
ssl->state >= MBEDTLS_SSL_SERVER_HELLO_DONE) {
return ssl_mfl_code_to_length(ssl->conf->mfl_code);
}
/* Check if a smaller max length was negotiated */
if (ssl->session_out != NULL) {
read_mfl = ssl_mfl_code_to_length(ssl->session_out->mfl_code);
if (read_mfl < max_len) {
max_len = read_mfl;
}
}
// During a handshake, use the value being negotiated
if (ssl->session_negotiate != NULL) {
read_mfl = ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code);
if (read_mfl < max_len) {
max_len = read_mfl;
}
}
return max_len;
}
size_t mbedtls_ssl_get_output_max_frag_len(const mbedtls_ssl_context *ssl)
{
size_t max_len;
/*
* Assume mfl_code is correct since it was checked when set
*/
max_len = ssl_mfl_code_to_length(ssl->conf->mfl_code);
/* Check if a smaller max length was negotiated */
if (ssl->session_out != NULL &&
ssl_mfl_code_to_length(ssl->session_out->mfl_code) < max_len) {
max_len = ssl_mfl_code_to_length(ssl->session_out->mfl_code);
}
/* During a handshake, use the value being negotiated */
if (ssl->session_negotiate != NULL &&
ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code) < max_len) {
max_len = ssl_mfl_code_to_length(ssl->session_negotiate->mfl_code);
}
return max_len;
}
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
size_t mbedtls_ssl_get_max_frag_len(const mbedtls_ssl_context *ssl)
{
return mbedtls_ssl_get_output_max_frag_len(ssl);
}
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
size_t mbedtls_ssl_get_current_mtu(const mbedtls_ssl_context *ssl)
{
/* Return unlimited mtu for client hello messages to avoid fragmentation. */
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
(ssl->state == MBEDTLS_SSL_CLIENT_HELLO ||
ssl->state == MBEDTLS_SSL_SERVER_HELLO)) {
return 0;
}
if (ssl->handshake == NULL || ssl->handshake->mtu == 0) {
return ssl->mtu;
}
if (ssl->mtu == 0) {
return ssl->handshake->mtu;
}
return ssl->mtu < ssl->handshake->mtu ?
ssl->mtu : ssl->handshake->mtu;
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
int mbedtls_ssl_get_max_out_record_payload(const mbedtls_ssl_context *ssl)
{
size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN;
#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
!defined(MBEDTLS_SSL_PROTO_DTLS)
(void) ssl;
#endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
const size_t mfl = mbedtls_ssl_get_output_max_frag_len(ssl);
if (max_len > mfl) {
max_len = mfl;
}
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (mbedtls_ssl_get_current_mtu(ssl) != 0) {
const size_t mtu = mbedtls_ssl_get_current_mtu(ssl);
const int ret = mbedtls_ssl_get_record_expansion(ssl);
const size_t overhead = (size_t) ret;
if (ret < 0) {
return ret;
}
if (mtu <= overhead) {
MBEDTLS_SSL_DEBUG_MSG(1, ("MTU too low for record expansion"));
return MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
}
if (max_len > mtu - overhead) {
max_len = mtu - overhead;
}
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \
!defined(MBEDTLS_SSL_PROTO_DTLS)
((void) ssl);
#endif
return (int) max_len;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert(const mbedtls_ssl_context *ssl)
{
if (ssl == NULL || ssl->session == NULL) {
return NULL;
}
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
return ssl->session->peer_cert;
#else
return NULL;
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_CLI_C)
int mbedtls_ssl_get_session(const mbedtls_ssl_context *ssl,
mbedtls_ssl_session *dst)
{
if (ssl == NULL ||
dst == NULL ||
ssl->session == NULL ||
ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
return mbedtls_ssl_session_copy(dst, ssl->session);
}
#endif /* MBEDTLS_SSL_CLI_C */
const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer(const mbedtls_ssl_context *ssl)
{
if (ssl == NULL) {
return NULL;
}
return ssl->session;
}
/*
* Define ticket header determining Mbed TLS version
* and structure of the ticket.
*/
/*
* Define bitflag determining compile-time settings influencing
* structure of serialized SSL sessions.
*/
#if defined(MBEDTLS_HAVE_TIME)
#define SSL_SERIALIZED_SESSION_CONFIG_TIME 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_TIME 0
#endif /* MBEDTLS_HAVE_TIME */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#define SSL_SERIALIZED_SESSION_CONFIG_CRT 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_CRT 0
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_SESSION_TICKETS)
#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 0
#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_SESSION_TICKETS */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
#define SSL_SERIALIZED_SESSION_CONFIG_MFL 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_MFL 0
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 0
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
#define SSL_SERIALIZED_SESSION_CONFIG_ETM 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_ETM 0
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0
#endif /* MBEDTLS_SSL_SESSION_TICKETS */
#define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0
#define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1
#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2
#define SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT 3
#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT 4
#define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 5
#define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 6
#define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \
((uint16_t) ( \
(SSL_SERIALIZED_SESSION_CONFIG_TIME << SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT) | \
(SSL_SERIALIZED_SESSION_CONFIG_CRT << SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT) | \
(SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET << \
SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT) | \
(SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT) | \
(SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC << \
SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT) | \
(SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT) | \
(SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT)))
static unsigned char ssl_serialized_session_header[] = {
MBEDTLS_VERSION_MAJOR,
MBEDTLS_VERSION_MINOR,
MBEDTLS_VERSION_PATCH,
MBEDTLS_BYTE_1(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG),
MBEDTLS_BYTE_0(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG),
};
/*
* Serialize a session in the following format:
* (in the presentation language of TLS, RFC 8446 section 3)
*
* opaque mbedtls_version[3]; // major, minor, patch
* opaque session_format[2]; // version-specific 16-bit field determining
* // the format of the remaining
* // serialized data.
*
* Note: When updating the format, remember to keep
* these version+format bytes.
*
* // In this version, `session_format` determines
* // the setting of those compile-time
* // configuration options which influence
* // the structure of mbedtls_ssl_session.
* uint64 start_time;
* uint8 ciphersuite[2]; // defined by the standard
* uint8 compression; // 0 or 1
* uint8 session_id_len; // at most 32
* opaque session_id[32];
* opaque master[48]; // fixed length in the standard
* uint32 verify_result;
* opaque peer_cert<0..2^24-1>; // length 0 means no peer cert
* opaque ticket<0..2^24-1>; // length 0 means no ticket
* uint32 ticket_lifetime;
* uint8 mfl_code; // up to 255 according to standard
* uint8 trunc_hmac; // 0 or 1
* uint8 encrypt_then_mac; // 0 or 1
*
* The order is the same as in the definition of the structure, except
* verify_result is put before peer_cert so that all mandatory fields come
* together in one block.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_session_save(const mbedtls_ssl_session *session,
unsigned char omit_header,
unsigned char *buf,
size_t buf_len,
size_t *olen)
{
unsigned char *p = buf;
size_t used = 0;
#if defined(MBEDTLS_HAVE_TIME)
uint64_t start;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
size_t cert_len;
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
if (!omit_header) {
/*
* Add version identifier
*/
used += sizeof(ssl_serialized_session_header);
if (used <= buf_len) {
memcpy(p, ssl_serialized_session_header,
sizeof(ssl_serialized_session_header));
p += sizeof(ssl_serialized_session_header);
}
}
/*
* Time
*/
#if defined(MBEDTLS_HAVE_TIME)
used += 8;
if (used <= buf_len) {
start = (uint64_t) session->start;
MBEDTLS_PUT_UINT64_BE(start, p, 0);
p += 8;
}
#endif /* MBEDTLS_HAVE_TIME */
/*
* Basic mandatory fields
*/
used += 2 /* ciphersuite */
+ 1 /* compression */
+ 1 /* id_len */
+ sizeof(session->id)
+ sizeof(session->master)
+ 4; /* verify_result */
if (used <= buf_len) {
MBEDTLS_PUT_UINT16_BE(session->ciphersuite, p, 0);
p += 2;
*p++ = MBEDTLS_BYTE_0(session->compression);
*p++ = MBEDTLS_BYTE_0(session->id_len);
memcpy(p, session->id, 32);
p += 32;
memcpy(p, session->master, 48);
p += 48;
MBEDTLS_PUT_UINT32_BE(session->verify_result, p, 0);
p += 4;
}
/*
* Peer's end-entity certificate
*/
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
if (session->peer_cert == NULL) {
cert_len = 0;
} else {
cert_len = session->peer_cert->raw.len;
}
used += 3 + cert_len;
if (used <= buf_len) {
*p++ = MBEDTLS_BYTE_2(cert_len);
*p++ = MBEDTLS_BYTE_1(cert_len);
*p++ = MBEDTLS_BYTE_0(cert_len);
if (session->peer_cert != NULL) {
memcpy(p, session->peer_cert->raw.p, cert_len);
p += cert_len;
}
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
if (session->peer_cert_digest != NULL) {
used += 1 /* type */ + 1 /* length */ + session->peer_cert_digest_len;
if (used <= buf_len) {
*p++ = (unsigned char) session->peer_cert_digest_type;
*p++ = (unsigned char) session->peer_cert_digest_len;
memcpy(p, session->peer_cert_digest,
session->peer_cert_digest_len);
p += session->peer_cert_digest_len;
}
} else {
used += 2;
if (used <= buf_len) {
*p++ = (unsigned char) MBEDTLS_MD_NONE;
*p++ = 0;
}
}
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/*
* Session ticket if any, plus associated data
*/
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
used += 3 + session->ticket_len + 4; /* len + ticket + lifetime */
if (used <= buf_len) {
*p++ = MBEDTLS_BYTE_2(session->ticket_len);
*p++ = MBEDTLS_BYTE_1(session->ticket_len);
*p++ = MBEDTLS_BYTE_0(session->ticket_len);
if (session->ticket != NULL) {
memcpy(p, session->ticket, session->ticket_len);
p += session->ticket_len;
}
MBEDTLS_PUT_UINT32_BE(session->ticket_lifetime, p, 0);
p += 4;
}
#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
/*
* Misc extension-related info
*/
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
used += 1;
if (used <= buf_len) {
*p++ = session->mfl_code;
}
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
used += 1;
if (used <= buf_len) {
*p++ = (unsigned char) ((session->trunc_hmac) & 0xFF);
}
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
used += 1;
if (used <= buf_len) {
*p++ = MBEDTLS_BYTE_0(session->encrypt_then_mac);
}
#endif
/* Done */
*olen = used;
if (used > buf_len) {
return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
}
return 0;
}
/*
* Public wrapper for ssl_session_save()
*/
int mbedtls_ssl_session_save(const mbedtls_ssl_session *session,
unsigned char *buf,
size_t buf_len,
size_t *olen)
{
return ssl_session_save(session, 0, buf, buf_len, olen);
}
/*
* Deserialize session, see mbedtls_ssl_session_save() for format.
*
* This internal version is wrapped by a public function that cleans up in
* case of error, and has an extra option omit_header.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_session_load(mbedtls_ssl_session *session,
unsigned char omit_header,
const unsigned char *buf,
size_t len)
{
const unsigned char *p = buf;
const unsigned char * const end = buf + len;
#if defined(MBEDTLS_HAVE_TIME)
uint64_t start;
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
size_t cert_len;
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
if (!omit_header) {
/*
* Check version identifier
*/
if ((size_t) (end - p) < sizeof(ssl_serialized_session_header)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (memcmp(p, ssl_serialized_session_header,
sizeof(ssl_serialized_session_header)) != 0) {
return MBEDTLS_ERR_SSL_VERSION_MISMATCH;
}
p += sizeof(ssl_serialized_session_header);
}
/*
* Time
*/
#if defined(MBEDTLS_HAVE_TIME)
if (8 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
start = ((uint64_t) p[0] << 56) |
((uint64_t) p[1] << 48) |
((uint64_t) p[2] << 40) |
((uint64_t) p[3] << 32) |
((uint64_t) p[4] << 24) |
((uint64_t) p[5] << 16) |
((uint64_t) p[6] << 8) |
((uint64_t) p[7]);
p += 8;
session->start = (time_t) start;
#endif /* MBEDTLS_HAVE_TIME */
/*
* Basic mandatory fields
*/
if (2 + 1 + 1 + 32 + 48 + 4 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->ciphersuite = (p[0] << 8) | p[1];
p += 2;
session->compression = *p++;
session->id_len = *p++;
memcpy(session->id, p, 32);
p += 32;
memcpy(session->master, p, 48);
p += 48;
session->verify_result = ((uint32_t) p[0] << 24) |
((uint32_t) p[1] << 16) |
((uint32_t) p[2] << 8) |
((uint32_t) p[3]);
p += 4;
/* Immediately clear invalid pointer values that have been read, in case
* we exit early before we replaced them with valid ones. */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
session->peer_cert = NULL;
#else
session->peer_cert_digest = NULL;
#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
session->ticket = NULL;
#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
/*
* Peer certificate
*/
#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
/* Deserialize CRT from the end of the ticket. */
if (3 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
cert_len = (p[0] << 16) | (p[1] << 8) | p[2];
p += 3;
if (cert_len != 0) {
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (cert_len > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->peer_cert = mbedtls_calloc(1, sizeof(mbedtls_x509_crt));
if (session->peer_cert == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
mbedtls_x509_crt_init(session->peer_cert);
if ((ret = mbedtls_x509_crt_parse_der(session->peer_cert,
p, cert_len)) != 0) {
mbedtls_x509_crt_free(session->peer_cert);
mbedtls_free(session->peer_cert);
session->peer_cert = NULL;
return ret;
}
p += cert_len;
}
#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
/* Deserialize CRT digest from the end of the ticket. */
if (2 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->peer_cert_digest_type = (mbedtls_md_type_t) *p++;
session->peer_cert_digest_len = (size_t) *p++;
if (session->peer_cert_digest_len != 0) {
const mbedtls_md_info_t *md_info =
mbedtls_md_info_from_type(session->peer_cert_digest_type);
if (md_info == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (session->peer_cert_digest_len != mbedtls_md_get_size(md_info)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (session->peer_cert_digest_len > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->peer_cert_digest =
mbedtls_calloc(1, session->peer_cert_digest_len);
if (session->peer_cert_digest == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
memcpy(session->peer_cert_digest, p,
session->peer_cert_digest_len);
p += session->peer_cert_digest_len;
}
#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/*
* Session ticket and associated data
*/
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
if (3 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->ticket_len = (p[0] << 16) | (p[1] << 8) | p[2];
p += 3;
if (session->ticket_len != 0) {
if (session->ticket_len > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->ticket = mbedtls_calloc(1, session->ticket_len);
if (session->ticket == NULL) {
return MBEDTLS_ERR_SSL_ALLOC_FAILED;
}
memcpy(session->ticket, p, session->ticket_len);
p += session->ticket_len;
}
if (4 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->ticket_lifetime = ((uint32_t) p[0] << 24) |
((uint32_t) p[1] << 16) |
((uint32_t) p[2] << 8) |
((uint32_t) p[3]);
p += 4;
#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
/*
* Misc extension-related info
*/
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
if (1 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->mfl_code = *p++;
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
if (1 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->trunc_hmac = *p++;
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
if (1 > (size_t) (end - p)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session->encrypt_then_mac = *p++;
#endif
/* Done, should have consumed entire buffer */
if (p != end) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
return 0;
}
/*
* Deserialize session: public wrapper for error cleaning
*/
int mbedtls_ssl_session_load(mbedtls_ssl_session *session,
const unsigned char *buf,
size_t len)
{
int ret = ssl_session_load(session, 0, buf, len);
if (ret != 0) {
mbedtls_ssl_session_free(session);
}
return ret;
}
/*
* Perform a single step of the SSL handshake
*/
int mbedtls_ssl_handshake_step(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
if (ssl == NULL || ssl->conf == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_SSL_CLI_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT) {
ret = mbedtls_ssl_handshake_client_step(ssl);
}
#endif
#if defined(MBEDTLS_SSL_SRV_C)
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
ret = mbedtls_ssl_handshake_server_step(ssl);
}
#endif
return ret;
}
/*
* Perform the SSL handshake
*/
int mbedtls_ssl_handshake(mbedtls_ssl_context *ssl)
{
int ret = 0;
/* Sanity checks */
if (ssl == NULL || ssl->conf == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
(ssl->f_set_timer == NULL || ssl->f_get_timer == NULL)) {
MBEDTLS_SSL_DEBUG_MSG(1, ("You must use "
"mbedtls_ssl_set_timer_cb() for DTLS"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
MBEDTLS_SSL_DEBUG_MSG(2, ("=> handshake"));
/* Main handshake loop */
while (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) {
ret = mbedtls_ssl_handshake_step(ssl);
if (ret != 0) {
break;
}
}
MBEDTLS_SSL_DEBUG_MSG(2, ("<= handshake"));
return ret;
}
#if defined(MBEDTLS_SSL_RENEGOTIATION)
#if defined(MBEDTLS_SSL_SRV_C)
/*
* Write HelloRequest to request renegotiation on server
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_write_hello_request(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> write hello request"));
ssl->out_msglen = 4;
ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
if ((ret = mbedtls_ssl_write_handshake_msg(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_write_handshake_msg", ret);
return ret;
}
MBEDTLS_SSL_DEBUG_MSG(2, ("<= write hello request"));
return 0;
}
#endif /* MBEDTLS_SSL_SRV_C */
/*
* Actually renegotiate current connection, triggered by either:
* - any side: calling mbedtls_ssl_renegotiate(),
* - client: receiving a HelloRequest during mbedtls_ssl_read(),
* - server: receiving any handshake message on server during mbedtls_ssl_read() after
* the initial handshake is completed.
* If the handshake doesn't complete due to waiting for I/O, it will continue
* during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
*/
int mbedtls_ssl_start_renegotiation(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
MBEDTLS_SSL_DEBUG_MSG(2, ("=> renegotiate"));
if ((ret = ssl_handshake_init(ssl)) != 0) {
return ret;
}
/* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
* the ServerHello will have message_seq = 1" */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING) {
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
ssl->handshake->out_msg_seq = 1;
} else {
ssl->handshake->in_msg_seq = 1;
}
}
#endif
ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
if ((ret = mbedtls_ssl_handshake(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake", ret);
return ret;
}
MBEDTLS_SSL_DEBUG_MSG(2, ("<= renegotiate"));
return 0;
}
/*
* Renegotiate current connection on client,
* or request renegotiation on server
*/
int mbedtls_ssl_renegotiate(mbedtls_ssl_context *ssl)
{
int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
if (ssl == NULL || ssl->conf == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_SSL_SRV_C)
/* On server, just send the request */
if (ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER) {
if (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
/* Did we already try/start sending HelloRequest? */
if (ssl->out_left != 0) {
return mbedtls_ssl_flush_output(ssl);
}
return ssl_write_hello_request(ssl);
}
#endif /* MBEDTLS_SSL_SRV_C */
#if defined(MBEDTLS_SSL_CLI_C)
/*
* On client, either start the renegotiation process or,
* if already in progress, continue the handshake
*/
if (ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS) {
if (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if ((ret = mbedtls_ssl_start_renegotiation(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_start_renegotiation", ret);
return ret;
}
} else {
if ((ret = mbedtls_ssl_handshake(ssl)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_handshake", ret);
return ret;
}
}
#endif /* MBEDTLS_SSL_CLI_C */
return ret;
}
#endif /* MBEDTLS_SSL_RENEGOTIATION */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
static void ssl_key_cert_free(mbedtls_ssl_key_cert *key_cert)
{
mbedtls_ssl_key_cert *cur = key_cert, *next;
while (cur != NULL) {
next = cur->next;
mbedtls_free(cur);
cur = next;
}
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
void mbedtls_ssl_handshake_free(mbedtls_ssl_context *ssl)
{
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
if (handshake == NULL) {
return;
}
#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
if (ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0) {
ssl->conf->f_async_cancel(ssl);
handshake->async_in_progress = 0;
}
#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
mbedtls_md5_free(&handshake->fin_md5);
mbedtls_sha1_free(&handshake->fin_sha1);
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_abort(&handshake->fin_sha256_psa);
#else
mbedtls_sha256_free(&handshake->fin_sha256);
#endif
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_hash_abort(&handshake->fin_sha384_psa);
#else
mbedtls_sha512_free(&handshake->fin_sha512);
#endif
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
#if defined(MBEDTLS_DHM_C)
mbedtls_dhm_free(&handshake->dhm_ctx);
#endif
#if defined(MBEDTLS_ECDH_C)
mbedtls_ecdh_free(&handshake->ecdh_ctx);
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
mbedtls_ecjpake_free(&handshake->ecjpake_ctx);
#if defined(MBEDTLS_SSL_CLI_C)
mbedtls_free(handshake->ecjpake_cache);
handshake->ecjpake_cache = NULL;
handshake->ecjpake_cache_len = 0;
#endif
#endif
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
/* explicit void pointer cast for buggy MS compiler */
mbedtls_free((void *) handshake->curves);
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
if (handshake->psk != NULL) {
mbedtls_platform_zeroize(handshake->psk, handshake->psk_len);
mbedtls_free(handshake->psk);
}
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
/*
* Free only the linked list wrapper, not the keys themselves
* since the belong to the SNI callback
*/
if (handshake->sni_key_cert != NULL) {
mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
while (cur != NULL) {
next = cur->next;
mbedtls_free(cur);
cur = next;
}
}
#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
mbedtls_x509_crt_restart_free(&handshake->ecrs_ctx);
if (handshake->ecrs_peer_cert != NULL) {
mbedtls_x509_crt_free(handshake->ecrs_peer_cert);
mbedtls_free(handshake->ecrs_peer_cert);
}
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
!defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
mbedtls_pk_free(&handshake->peer_pubkey);
#endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
mbedtls_free(handshake->verify_cookie);
mbedtls_ssl_flight_free(handshake->flight);
mbedtls_ssl_buffering_free(ssl);
#endif
#if defined(MBEDTLS_ECDH_C) && \
defined(MBEDTLS_USE_PSA_CRYPTO)
psa_destroy_key(handshake->ecdh_psa_privkey);
#endif /* MBEDTLS_ECDH_C && MBEDTLS_USE_PSA_CRYPTO */
mbedtls_platform_zeroize(handshake,
sizeof(mbedtls_ssl_handshake_params));
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
/* If the buffers are too big - reallocate. Because of the way Mbed TLS
* processes datagrams and the fact that a datagram is allowed to have
* several records in it, it is possible that the I/O buffers are not
* empty at this stage */
handle_buffer_resizing(ssl, 1, mbedtls_ssl_get_input_buflen(ssl),
mbedtls_ssl_get_output_buflen(ssl));
#endif
}
void mbedtls_ssl_session_free(mbedtls_ssl_session *session)
{
if (session == NULL) {
return;
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
ssl_clear_peer_cert(session);
#endif
#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
mbedtls_free(session->ticket);
#endif
mbedtls_platform_zeroize(session, sizeof(mbedtls_ssl_session));
}
#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 1u
#else
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 0u
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 1u
#else
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 0u
#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 1u
#else
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 0u
#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
#if defined(MBEDTLS_SSL_ALPN)
#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 1u
#else
#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 0u
#endif /* MBEDTLS_SSL_ALPN */
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT 0
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT 1
#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT 2
#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT 3
#define SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG \
((uint32_t) ( \
(SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID << \
SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT) | \
(SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT << \
SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT) | \
(SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY << \
SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT) | \
(SSL_SERIALIZED_CONTEXT_CONFIG_ALPN << SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT) | \
0u))
static unsigned char ssl_serialized_context_header[] = {
MBEDTLS_VERSION_MAJOR,
MBEDTLS_VERSION_MINOR,
MBEDTLS_VERSION_PATCH,
MBEDTLS_BYTE_1(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG),
MBEDTLS_BYTE_0(SSL_SERIALIZED_SESSION_CONFIG_BITFLAG),
MBEDTLS_BYTE_2(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG),
MBEDTLS_BYTE_1(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG),
MBEDTLS_BYTE_0(SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG),
};
/*
* Serialize a full SSL context
*
* The format of the serialized data is:
* (in the presentation language of TLS, RFC 8446 section 3)
*
* // header
* opaque mbedtls_version[3]; // major, minor, patch
* opaque context_format[5]; // version-specific field determining
* // the format of the remaining
* // serialized data.
* Note: When updating the format, remember to keep these
* version+format bytes. (We may make their size part of the API.)
*
* // session sub-structure
* opaque session<1..2^32-1>; // see mbedtls_ssl_session_save()
* // transform sub-structure
* uint8 random[64]; // ServerHello.random+ClientHello.random
* uint8 in_cid<0..2^8-1> // Connection ID: expected incoming value
* uint8 out_cid<0..2^8-1> // Connection ID: outgoing value to use
* // fields from ssl_context
* uint32 badmac_seen; // DTLS: number of records with failing MAC
* uint64 in_window_top; // DTLS: last validated record seq_num
* uint64 in_window; // DTLS: bitmask for replay protection
* uint8 disable_datagram_packing; // DTLS: only one record per datagram
* uint64 cur_out_ctr; // Record layer: outgoing sequence number
* uint16 mtu; // DTLS: path mtu (max outgoing fragment size)
* uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol
*
* Note that many fields of the ssl_context or sub-structures are not
* serialized, as they fall in one of the following categories:
*
* 1. forced value (eg in_left must be 0)
* 2. pointer to dynamically-allocated memory (eg session, transform)
* 3. value can be re-derived from other data (eg session keys from MS)
* 4. value was temporary (eg content of input buffer)
* 5. value will be provided by the user again (eg I/O callbacks and context)
*/
int mbedtls_ssl_context_save(mbedtls_ssl_context *ssl,
unsigned char *buf,
size_t buf_len,
size_t *olen)
{
unsigned char *p = buf;
size_t used = 0;
size_t session_len;
int ret = 0;
/*
* Enforce usage restrictions, see "return BAD_INPUT_DATA" in
* this function's documentation.
*
* These are due to assumptions/limitations in the implementation. Some of
* them are likely to stay (no handshake in progress) some might go away
* (only DTLS) but are currently used to simplify the implementation.
*/
/* The initial handshake must be over */
if (ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Initial handshake isn't over"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (ssl->handshake != NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Handshake isn't completed"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* Double-check that sub-structures are indeed ready */
if (ssl->transform == NULL || ssl->session == NULL) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Serialised structures aren't ready"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* There must be no pending incoming or outgoing data */
if (mbedtls_ssl_check_pending(ssl) != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("There is pending incoming data"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (ssl->out_left != 0) {
MBEDTLS_SSL_DEBUG_MSG(1, ("There is pending outgoing data"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* Protocol must be DTLS, not TLS */
if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Only DTLS is supported"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* Version must be 1.2 */
if (ssl->major_ver != MBEDTLS_SSL_MAJOR_VERSION_3) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Only version 1.2 supported"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Only version 1.2 supported"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* We must be using an AEAD ciphersuite */
if (mbedtls_ssl_transform_uses_aead(ssl->transform) != 1) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Only AEAD ciphersuites supported"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* Renegotiation must not be enabled */
#if defined(MBEDTLS_SSL_RENEGOTIATION)
if (ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED) {
MBEDTLS_SSL_DEBUG_MSG(1, ("Renegotiation must not be enabled"));
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
#endif
/*
* Version and format identifier
*/
used += sizeof(ssl_serialized_context_header);
if (used <= buf_len) {
memcpy(p, ssl_serialized_context_header,
sizeof(ssl_serialized_context_header));
p += sizeof(ssl_serialized_context_header);
}
/*
* Session (length + data)
*/
ret = ssl_session_save(ssl->session, 1, NULL, 0, &session_len);
if (ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL) {
return ret;
}
used += 4 + session_len;
if (used <= buf_len) {
MBEDTLS_PUT_UINT32_BE(session_len, p, 0);
p += 4;
ret = ssl_session_save(ssl->session, 1,
p, session_len, &session_len);
if (ret != 0) {
return ret;
}
p += session_len;
}
/*
* Transform
*/
used += sizeof(ssl->transform->randbytes);
if (used <= buf_len) {
memcpy(p, ssl->transform->randbytes,
sizeof(ssl->transform->randbytes));
p += sizeof(ssl->transform->randbytes);
}
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
used += 2 + ssl->transform->in_cid_len + ssl->transform->out_cid_len;
if (used <= buf_len) {
*p++ = ssl->transform->in_cid_len;
memcpy(p, ssl->transform->in_cid, ssl->transform->in_cid_len);
p += ssl->transform->in_cid_len;
*p++ = ssl->transform->out_cid_len;
memcpy(p, ssl->transform->out_cid, ssl->transform->out_cid_len);
p += ssl->transform->out_cid_len;
}
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
/*
* Saved fields from top-level ssl_context structure
*/
#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
used += 4;
if (used <= buf_len) {
MBEDTLS_PUT_UINT32_BE(ssl->badmac_seen, p, 0);
p += 4;
}
#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
used += 16;
if (used <= buf_len) {
MBEDTLS_PUT_UINT64_BE(ssl->in_window_top, p, 0);
p += 8;
MBEDTLS_PUT_UINT64_BE(ssl->in_window, p, 0);
p += 8;
}
#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
used += 1;
if (used <= buf_len) {
*p++ = ssl->disable_datagram_packing;
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
used += 8;
if (used <= buf_len) {
memcpy(p, ssl->cur_out_ctr, 8);
p += 8;
}
#if defined(MBEDTLS_SSL_PROTO_DTLS)
used += 2;
if (used <= buf_len) {
MBEDTLS_PUT_UINT16_BE(ssl->mtu, p, 0);
p += 2;
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if defined(MBEDTLS_SSL_ALPN)
{
const uint8_t alpn_len = ssl->alpn_chosen
? (uint8_t) strlen(ssl->alpn_chosen)
: 0;
used += 1 + alpn_len;
if (used <= buf_len) {
*p++ = alpn_len;
if (ssl->alpn_chosen != NULL) {
memcpy(p, ssl->alpn_chosen, alpn_len);
p += alpn_len;
}
}
}
#endif /* MBEDTLS_SSL_ALPN */
/*
* Done
*/
*olen = used;
if (used > buf_len) {
return MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL;
}
MBEDTLS_SSL_DEBUG_BUF(4, "saved context", buf, used);
return mbedtls_ssl_session_reset_int(ssl, 0);
}
/*
* Helper to get TLS 1.2 PRF from ciphersuite
* (Duplicates bits of logic from ssl_set_handshake_prfs().)
*/
#if defined(MBEDTLS_SHA256_C) || \
(defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384))
typedef int (*tls_prf_fn)(const unsigned char *secret, size_t slen,
const char *label,
const unsigned char *random, size_t rlen,
unsigned char *dstbuf, size_t dlen);
static tls_prf_fn ssl_tls12prf_from_cs(int ciphersuite_id)
{
const mbedtls_ssl_ciphersuite_t * const ciphersuite_info =
mbedtls_ssl_ciphersuite_from_id(ciphersuite_id);
if (ciphersuite_info == NULL) {
return NULL;
}
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
if (ciphersuite_info->mac == MBEDTLS_MD_SHA384) {
return tls_prf_sha384;
} else
#endif
#if defined(MBEDTLS_SHA256_C)
{
if (ciphersuite_info->mac == MBEDTLS_MD_SHA256) {
return tls_prf_sha256;
}
}
#endif
#if !defined(MBEDTLS_SHA256_C) && \
(!defined(MBEDTLS_SHA512_C) || defined(MBEDTLS_SHA512_NO_SHA384))
(void) ciphersuite_info;
#endif
return NULL;
}
#endif /* MBEDTLS_SHA256_C ||
(MBEDTLS_SHA512_C && !MBEDTLS_SHA512_NO_SHA384) */
/*
* Deserialize context, see mbedtls_ssl_context_save() for format.
*
* This internal version is wrapped by a public function that cleans up in
* case of error.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
static int ssl_context_load(mbedtls_ssl_context *ssl,
const unsigned char *buf,
size_t len)
{
const unsigned char *p = buf;
const unsigned char * const end = buf + len;
size_t session_len;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
tls_prf_fn prf_func = NULL;
/*
* The context should have been freshly setup or reset.
* Give the user an error in case of obvious misuse.
* (Checking session is useful because it won't be NULL if we're
* renegotiating, or if the user mistakenly loaded a session first.)
*/
if (ssl->state != MBEDTLS_SSL_HELLO_REQUEST ||
ssl->session != NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/*
* We can't check that the config matches the initial one, but we can at
* least check it matches the requirements for serializing.
*/
if (ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
ssl->conf->max_major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 ||
ssl->conf->min_major_ver > MBEDTLS_SSL_MAJOR_VERSION_3 ||
ssl->conf->max_minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ||
ssl->conf->min_minor_ver > MBEDTLS_SSL_MINOR_VERSION_3 ||
#if defined(MBEDTLS_SSL_RENEGOTIATION)
ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
#endif
0) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
MBEDTLS_SSL_DEBUG_BUF(4, "context to load", buf, len);
/*
* Check version identifier
*/
if ((size_t) (end - p) < sizeof(ssl_serialized_context_header)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
if (memcmp(p, ssl_serialized_context_header,
sizeof(ssl_serialized_context_header)) != 0) {
return MBEDTLS_ERR_SSL_VERSION_MISMATCH;
}
p += sizeof(ssl_serialized_context_header);
/*
* Session
*/
if ((size_t) (end - p) < 4) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
session_len = ((size_t) p[0] << 24) |
((size_t) p[1] << 16) |
((size_t) p[2] << 8) |
((size_t) p[3]);
p += 4;
/* This has been allocated by ssl_handshake_init(), called by
* by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */
ssl->session = ssl->session_negotiate;
ssl->session_in = ssl->session;
ssl->session_out = ssl->session;
ssl->session_negotiate = NULL;
if ((size_t) (end - p) < session_len) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ret = ssl_session_load(ssl->session, 1, p, session_len);
if (ret != 0) {
mbedtls_ssl_session_free(ssl->session);
return ret;
}
p += session_len;
/*
* Transform
*/
/* This has been allocated by ssl_handshake_init(), called by
* by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */
ssl->transform = ssl->transform_negotiate;
ssl->transform_in = ssl->transform;
ssl->transform_out = ssl->transform;
ssl->transform_negotiate = NULL;
prf_func = ssl_tls12prf_from_cs(ssl->session->ciphersuite);
if (prf_func == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
/* Read random bytes and populate structure */
if ((size_t) (end - p) < sizeof(ssl->transform->randbytes)) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ret = ssl_populate_transform(ssl->transform,
ssl->session->ciphersuite,
ssl->session->master,
#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
ssl->session->encrypt_then_mac,
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
ssl->session->trunc_hmac,
#endif
#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
#if defined(MBEDTLS_ZLIB_SUPPORT)
ssl->session->compression,
#endif
prf_func,
p, /* currently pointing to randbytes */
MBEDTLS_SSL_MINOR_VERSION_3, /* (D)TLS 1.2 is forced */
ssl->conf->endpoint,
ssl);
if (ret != 0) {
return ret;
}
p += sizeof(ssl->transform->randbytes);
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
/* Read connection IDs and store them */
if ((size_t) (end - p) < 1) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl->transform->in_cid_len = *p++;
if ((size_t) (end - p) < ssl->transform->in_cid_len + 1u) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
memcpy(ssl->transform->in_cid, p, ssl->transform->in_cid_len);
p += ssl->transform->in_cid_len;
ssl->transform->out_cid_len = *p++;
if ((size_t) (end - p) < ssl->transform->out_cid_len) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
memcpy(ssl->transform->out_cid, p, ssl->transform->out_cid_len);
p += ssl->transform->out_cid_len;
#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
/*
* Saved fields from top-level ssl_context structure
*/
#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
if ((size_t) (end - p) < 4) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl->badmac_seen = ((uint32_t) p[0] << 24) |
((uint32_t) p[1] << 16) |
((uint32_t) p[2] << 8) |
((uint32_t) p[3]);
p += 4;
#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
if ((size_t) (end - p) < 16) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl->in_window_top = ((uint64_t) p[0] << 56) |
((uint64_t) p[1] << 48) |
((uint64_t) p[2] << 40) |
((uint64_t) p[3] << 32) |
((uint64_t) p[4] << 24) |
((uint64_t) p[5] << 16) |
((uint64_t) p[6] << 8) |
((uint64_t) p[7]);
p += 8;
ssl->in_window = ((uint64_t) p[0] << 56) |
((uint64_t) p[1] << 48) |
((uint64_t) p[2] << 40) |
((uint64_t) p[3] << 32) |
((uint64_t) p[4] << 24) |
((uint64_t) p[5] << 16) |
((uint64_t) p[6] << 8) |
((uint64_t) p[7]);
p += 8;
#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if ((size_t) (end - p) < 1) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl->disable_datagram_packing = *p++;
#endif /* MBEDTLS_SSL_PROTO_DTLS */
if ((size_t) (end - p) < 8) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
memcpy(ssl->cur_out_ctr, p, 8);
p += 8;
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if ((size_t) (end - p) < 2) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
ssl->mtu = (p[0] << 8) | p[1];
p += 2;
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if defined(MBEDTLS_SSL_ALPN)
{
uint8_t alpn_len;
const char **cur;
if ((size_t) (end - p) < 1) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
alpn_len = *p++;
if (alpn_len != 0 && ssl->conf->alpn_list != NULL) {
/* alpn_chosen should point to an item in the configured list */
for (cur = ssl->conf->alpn_list; *cur != NULL; cur++) {
if (strlen(*cur) == alpn_len &&
memcmp(p, cur, alpn_len) == 0) {
ssl->alpn_chosen = *cur;
break;
}
}
}
/* can only happen on conf mismatch */
if (alpn_len != 0 && ssl->alpn_chosen == NULL) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
p += alpn_len;
}
#endif /* MBEDTLS_SSL_ALPN */
/*
* Forced fields from top-level ssl_context structure
*
* Most of them already set to the correct value by mbedtls_ssl_init() and
* mbedtls_ssl_reset(), so we only need to set the remaining ones.
*/
ssl->state = MBEDTLS_SSL_HANDSHAKE_OVER;
ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
ssl->minor_ver = MBEDTLS_SSL_MINOR_VERSION_3;
/* Adjust pointers for header fields of outgoing records to
* the given transform, accounting for explicit IV and CID. */
mbedtls_ssl_update_out_pointers(ssl, ssl->transform);
#if defined(MBEDTLS_SSL_PROTO_DTLS)
ssl->in_epoch = 1;
#endif
/* mbedtls_ssl_reset() leaves the handshake sub-structure allocated,
* which we don't want - otherwise we'd end up freeing the wrong transform
* by calling mbedtls_ssl_handshake_wrapup_free_hs_transform()
* inappropriately. */
if (ssl->handshake != NULL) {
mbedtls_ssl_handshake_free(ssl);
mbedtls_free(ssl->handshake);
ssl->handshake = NULL;
}
/*
* Done - should have consumed entire buffer
*/
if (p != end) {
return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
}
return 0;
}
/*
* Deserialize context: public wrapper for error cleaning
*/
int mbedtls_ssl_context_load(mbedtls_ssl_context *context,
const unsigned char *buf,
size_t len)
{
int ret = ssl_context_load(context, buf, len);
if (ret != 0) {
mbedtls_ssl_free(context);
}
return ret;
}
#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
/*
* Free an SSL context
*/
void mbedtls_ssl_free(mbedtls_ssl_context *ssl)
{
if (ssl == NULL) {
return;
}
MBEDTLS_SSL_DEBUG_MSG(2, ("=> free"));
if (ssl->out_buf != NULL) {
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
size_t out_buf_len = ssl->out_buf_len;
#else
size_t out_buf_len = MBEDTLS_SSL_OUT_BUFFER_LEN;
#endif
mbedtls_platform_zeroize(ssl->out_buf, out_buf_len);
mbedtls_free(ssl->out_buf);
ssl->out_buf = NULL;
}
if (ssl->in_buf != NULL) {
#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
size_t in_buf_len = ssl->in_buf_len;
#else
size_t in_buf_len = MBEDTLS_SSL_IN_BUFFER_LEN;
#endif
mbedtls_platform_zeroize(ssl->in_buf, in_buf_len);
mbedtls_free(ssl->in_buf);
ssl->in_buf = NULL;
}
#if defined(MBEDTLS_ZLIB_SUPPORT)
if (ssl->compress_buf != NULL) {
mbedtls_platform_zeroize(ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN);
mbedtls_free(ssl->compress_buf);
}
#endif
if (ssl->transform) {
mbedtls_ssl_transform_free(ssl->transform);
mbedtls_free(ssl->transform);
}
if (ssl->handshake) {
mbedtls_ssl_handshake_free(ssl);
mbedtls_ssl_transform_free(ssl->transform_negotiate);
mbedtls_ssl_session_free(ssl->session_negotiate);
mbedtls_free(ssl->handshake);
mbedtls_free(ssl->transform_negotiate);
mbedtls_free(ssl->session_negotiate);
}
if (ssl->session) {
mbedtls_ssl_session_free(ssl->session);
mbedtls_free(ssl->session);
}
#if defined(MBEDTLS_X509_CRT_PARSE_C)
if (ssl->hostname != NULL) {
mbedtls_platform_zeroize(ssl->hostname, strlen(ssl->hostname));
mbedtls_free(ssl->hostname);
}
#endif
#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
if (mbedtls_ssl_hw_record_finish != NULL) {
MBEDTLS_SSL_DEBUG_MSG(2, ("going for mbedtls_ssl_hw_record_finish()"));
mbedtls_ssl_hw_record_finish(ssl);
}
#endif
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
mbedtls_free(ssl->cli_id);
#endif
MBEDTLS_SSL_DEBUG_MSG(2, ("<= free"));
/* Actually clear after last debug message */
mbedtls_platform_zeroize(ssl, sizeof(mbedtls_ssl_context));
}
/*
* Initialize mbedtls_ssl_config
*/
void mbedtls_ssl_config_init(mbedtls_ssl_config *conf)
{
memset(conf, 0, sizeof(mbedtls_ssl_config));
}
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
static int ssl_preset_default_hashes[] = {
#if defined(MBEDTLS_SHA512_C)
MBEDTLS_MD_SHA512,
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
MBEDTLS_MD_SHA384,
#endif
#if defined(MBEDTLS_SHA256_C)
MBEDTLS_MD_SHA256,
MBEDTLS_MD_SHA224,
#endif
#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE)
MBEDTLS_MD_SHA1,
#endif
MBEDTLS_MD_NONE
};
#endif
static int ssl_preset_suiteb_ciphersuites[] = {
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
0
};
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
static int ssl_preset_suiteb_hashes[] = {
MBEDTLS_MD_SHA256,
MBEDTLS_MD_SHA384,
MBEDTLS_MD_NONE
};
#endif
#if defined(MBEDTLS_ECP_C)
static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
MBEDTLS_ECP_DP_SECP256R1,
#endif
#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
MBEDTLS_ECP_DP_SECP384R1,
#endif
MBEDTLS_ECP_DP_NONE
};
#endif
/*
* Load default in mbedtls_ssl_config
*/
int mbedtls_ssl_config_defaults(mbedtls_ssl_config *conf,
int endpoint, int transport, int preset)
{
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#endif
/* Use the functions here so that they are covered in tests,
* but otherwise access member directly for efficiency */
mbedtls_ssl_conf_endpoint(conf, endpoint);
mbedtls_ssl_conf_transport(conf, transport);
/*
* Things that are common to all presets
*/
#if defined(MBEDTLS_SSL_CLI_C)
if (endpoint == MBEDTLS_SSL_IS_CLIENT) {
conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
#if defined(MBEDTLS_SSL_SESSION_TICKETS)
conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
#endif
}
#endif
#if defined(MBEDTLS_ARC4_C)
conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
#endif
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
#endif
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
#endif
#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
conf->f_cookie_write = ssl_cookie_write_dummy;
conf->f_cookie_check = ssl_cookie_check_dummy;
#endif
#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
#endif
#if defined(MBEDTLS_SSL_SRV_C)
conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED;
#endif
#if defined(MBEDTLS_SSL_PROTO_DTLS)
conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
#endif
#if defined(MBEDTLS_SSL_RENEGOTIATION)
conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
memset(conf->renego_period, 0x00, 2);
memset(conf->renego_period + 2, 0xFF, 6);
#endif
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
if (endpoint == MBEDTLS_SSL_IS_SERVER) {
const unsigned char dhm_p[] =
MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN;
const unsigned char dhm_g[] =
MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN;
if ((ret = mbedtls_ssl_conf_dh_param_bin(conf,
dhm_p, sizeof(dhm_p),
dhm_g, sizeof(dhm_g))) != 0) {
return ret;
}
}
#endif
/*
* Preset-specific defaults
*/
switch (preset) {
/*
* NSA Suite B
*/
case MBEDTLS_SSL_PRESET_SUITEB:
conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
ssl_preset_suiteb_ciphersuites;
#if defined(MBEDTLS_X509_CRT_PARSE_C)
conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
conf->sig_hashes = ssl_preset_suiteb_hashes;
#endif
#if defined(MBEDTLS_ECP_C)
conf->curve_list = ssl_preset_suiteb_curves;
#endif
break;
/*
* Default
*/
default:
conf->min_major_ver = (MBEDTLS_SSL_MIN_MAJOR_VERSION >
MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION) ?
MBEDTLS_SSL_MIN_MAJOR_VERSION :
MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION;
conf->min_minor_ver = (MBEDTLS_SSL_MIN_MINOR_VERSION >
MBEDTLS_SSL_MIN_VALID_MINOR_VERSION) ?
MBEDTLS_SSL_MIN_MINOR_VERSION :
MBEDTLS_SSL_MIN_VALID_MINOR_VERSION;
conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if (transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
}
#endif
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
mbedtls_ssl_list_ciphersuites();
#if defined(MBEDTLS_X509_CRT_PARSE_C)
conf->cert_profile = &mbedtls_x509_crt_profile_default;
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
conf->sig_hashes = ssl_preset_default_hashes;
#endif
#if defined(MBEDTLS_ECP_C)
conf->curve_list = mbedtls_ecp_grp_id_list();
#endif
#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
conf->dhm_min_bitlen = 1024;
#endif
}
return 0;
}
/*
* Free mbedtls_ssl_config
*/
void mbedtls_ssl_config_free(mbedtls_ssl_config *conf)
{
#if defined(MBEDTLS_DHM_C)
mbedtls_mpi_free(&conf->dhm_P);
mbedtls_mpi_free(&conf->dhm_G);
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
if (conf->psk != NULL) {
mbedtls_platform_zeroize(conf->psk, conf->psk_len);
mbedtls_free(conf->psk);
conf->psk = NULL;
conf->psk_len = 0;
}
if (conf->psk_identity != NULL) {
mbedtls_platform_zeroize(conf->psk_identity, conf->psk_identity_len);
mbedtls_free(conf->psk_identity);
conf->psk_identity = NULL;
conf->psk_identity_len = 0;
}
#endif
#if defined(MBEDTLS_X509_CRT_PARSE_C)
ssl_key_cert_free(conf->key_cert);
#endif
mbedtls_platform_zeroize(conf, sizeof(mbedtls_ssl_config));
}
#if defined(MBEDTLS_PK_C) && \
(defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C))
/*
* Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
*/
unsigned char mbedtls_ssl_sig_from_pk(mbedtls_pk_context *pk)
{
#if defined(MBEDTLS_RSA_C)
if (mbedtls_pk_can_do(pk, MBEDTLS_PK_RSA)) {
return MBEDTLS_SSL_SIG_RSA;
}
#endif
#if defined(MBEDTLS_ECDSA_C)
if (mbedtls_pk_can_do(pk, MBEDTLS_PK_ECDSA)) {
return MBEDTLS_SSL_SIG_ECDSA;
}
#endif
return MBEDTLS_SSL_SIG_ANON;
}
unsigned char mbedtls_ssl_sig_from_pk_alg(mbedtls_pk_type_t type)
{
switch (type) {
case MBEDTLS_PK_RSA:
return MBEDTLS_SSL_SIG_RSA;
case MBEDTLS_PK_ECDSA:
case MBEDTLS_PK_ECKEY:
return MBEDTLS_SSL_SIG_ECDSA;
default:
return MBEDTLS_SSL_SIG_ANON;
}
}
mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig(unsigned char sig)
{
switch (sig) {
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_SSL_SIG_RSA:
return MBEDTLS_PK_RSA;
#endif
#if defined(MBEDTLS_ECDSA_C)
case MBEDTLS_SSL_SIG_ECDSA:
return MBEDTLS_PK_ECDSA;
#endif
default:
return MBEDTLS_PK_NONE;
}
}
#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/* Find an entry in a signature-hash set matching a given hash algorithm. */
mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find(mbedtls_ssl_sig_hash_set_t *set,
mbedtls_pk_type_t sig_alg)
{
switch (sig_alg) {
case MBEDTLS_PK_RSA:
return set->rsa;
case MBEDTLS_PK_ECDSA:
return set->ecdsa;
default:
return MBEDTLS_MD_NONE;
}
}
/* Add a signature-hash-pair to a signature-hash set */
void mbedtls_ssl_sig_hash_set_add(mbedtls_ssl_sig_hash_set_t *set,
mbedtls_pk_type_t sig_alg,
mbedtls_md_type_t md_alg)
{
switch (sig_alg) {
case MBEDTLS_PK_RSA:
if (set->rsa == MBEDTLS_MD_NONE) {
set->rsa = md_alg;
}
break;
case MBEDTLS_PK_ECDSA:
if (set->ecdsa == MBEDTLS_MD_NONE) {
set->ecdsa = md_alg;
}
break;
default:
break;
}
}
/* Allow exactly one hash algorithm for each signature. */
void mbedtls_ssl_sig_hash_set_const_hash(mbedtls_ssl_sig_hash_set_t *set,
mbedtls_md_type_t md_alg)
{
set->rsa = md_alg;
set->ecdsa = md_alg;
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_2) &&
MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
/*
* Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
*/
mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash(unsigned char hash)
{
switch (hash) {
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_SSL_HASH_MD5:
return MBEDTLS_MD_MD5;
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_SSL_HASH_SHA1:
return MBEDTLS_MD_SHA1;
#endif
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_SSL_HASH_SHA224:
return MBEDTLS_MD_SHA224;
case MBEDTLS_SSL_HASH_SHA256:
return MBEDTLS_MD_SHA256;
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
case MBEDTLS_SSL_HASH_SHA384:
return MBEDTLS_MD_SHA384;
#endif
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_SSL_HASH_SHA512:
return MBEDTLS_MD_SHA512;
#endif
default:
return MBEDTLS_MD_NONE;
}
}
/*
* Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
*/
unsigned char mbedtls_ssl_hash_from_md_alg(int md)
{
switch (md) {
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_MD_MD5:
return MBEDTLS_SSL_HASH_MD5;
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_MD_SHA1:
return MBEDTLS_SSL_HASH_SHA1;
#endif
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_MD_SHA224:
return MBEDTLS_SSL_HASH_SHA224;
case MBEDTLS_MD_SHA256:
return MBEDTLS_SSL_HASH_SHA256;
#endif
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
case MBEDTLS_MD_SHA384:
return MBEDTLS_SSL_HASH_SHA384;
#endif
#if defined(MBEDTLS_SHA512_C)
case MBEDTLS_MD_SHA512:
return MBEDTLS_SSL_HASH_SHA512;
#endif
default:
return MBEDTLS_SSL_HASH_NONE;
}
}
#if defined(MBEDTLS_ECP_C)
/*
* Check if a curve proposed by the peer is in our list.
* Return 0 if we're willing to use it, -1 otherwise.
*/
int mbedtls_ssl_check_curve(const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id)
{
const mbedtls_ecp_group_id *gid;
if (ssl->conf->curve_list == NULL) {
return -1;
}
for (gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++) {
if (*gid == grp_id) {
return 0;
}
}
return -1;
}
/*
* Same as mbedtls_ssl_check_curve() but takes a TLS ID for the curve.
*/
int mbedtls_ssl_check_curve_tls_id(const mbedtls_ssl_context *ssl, uint16_t tls_id)
{
const mbedtls_ecp_curve_info *curve_info =
mbedtls_ecp_curve_info_from_tls_id(tls_id);
if (curve_info == NULL) {
return -1;
}
return mbedtls_ssl_check_curve(ssl, curve_info->grp_id);
}
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/*
* Check if a hash proposed by the peer is in our list.
* Return 0 if we're willing to use it, -1 otherwise.
*/
int mbedtls_ssl_check_sig_hash(const mbedtls_ssl_context *ssl,
mbedtls_md_type_t md)
{
const int *cur;
if (ssl->conf->sig_hashes == NULL) {
return -1;
}
for (cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++) {
if (*cur == (int) md) {
return 0;
}
}
return -1;
}
#endif /* MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
#if defined(MBEDTLS_X509_CRT_PARSE_C)
int mbedtls_ssl_check_cert_usage(const mbedtls_x509_crt *cert,
const mbedtls_ssl_ciphersuite_t *ciphersuite,
int cert_endpoint,
uint32_t *flags)
{
int ret = 0;
#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
int usage = 0;
#endif
#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
const char *ext_oid;
size_t ext_len;
#endif
#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
!defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
((void) cert);
((void) cert_endpoint);
((void) flags);
#endif
#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
if (cert_endpoint == MBEDTLS_SSL_IS_SERVER) {
/* Server part of the key exchange */
switch (ciphersuite->key_exchange) {
case MBEDTLS_KEY_EXCHANGE_RSA:
case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
break;
case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
break;
case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
break;
/* Don't use default: we want warnings when adding new values */
case MBEDTLS_KEY_EXCHANGE_NONE:
case MBEDTLS_KEY_EXCHANGE_PSK:
case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
usage = 0;
}
} else {
/* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
}
if (mbedtls_x509_crt_check_key_usage(cert, usage) != 0) {
*flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
ret = -1;
}
#else
((void) ciphersuite);
#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
if (cert_endpoint == MBEDTLS_SSL_IS_SERVER) {
ext_oid = MBEDTLS_OID_SERVER_AUTH;
ext_len = MBEDTLS_OID_SIZE(MBEDTLS_OID_SERVER_AUTH);
} else {
ext_oid = MBEDTLS_OID_CLIENT_AUTH;
ext_len = MBEDTLS_OID_SIZE(MBEDTLS_OID_CLIENT_AUTH);
}
if (mbedtls_x509_crt_check_extended_key_usage(cert, ext_oid, ext_len) != 0) {
*flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
ret = -1;
}
#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
return ret;
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
int mbedtls_ssl_set_calc_verify_md(mbedtls_ssl_context *ssl, int md)
{
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if (ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3) {
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
}
switch (md) {
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
#if defined(MBEDTLS_MD5_C)
case MBEDTLS_SSL_HASH_MD5:
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
#endif
#if defined(MBEDTLS_SHA1_C)
case MBEDTLS_SSL_HASH_SHA1:
ssl->handshake->calc_verify = ssl_calc_verify_tls;
break;
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_SHA512_NO_SHA384)
case MBEDTLS_SSL_HASH_SHA384:
ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384;
break;
#endif
#if defined(MBEDTLS_SHA256_C)
case MBEDTLS_SSL_HASH_SHA256:
ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256;
break;
#endif
default:
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
}
return 0;
#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */
(void) ssl;
(void) md;
return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
}
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
int mbedtls_ssl_get_key_exchange_md_ssl_tls(mbedtls_ssl_context *ssl,
unsigned char *output,
unsigned char *data, size_t data_len)
{
int ret = 0;
mbedtls_md5_context mbedtls_md5;
mbedtls_sha1_context mbedtls_sha1;
mbedtls_md5_init(&mbedtls_md5);
mbedtls_sha1_init(&mbedtls_sha1);
/*
* digitally-signed struct {
* opaque md5_hash[16];
* opaque sha_hash[20];
* };
*
* md5_hash
* MD5(ClientHello.random + ServerHello.random
* + ServerParams);
* sha_hash
* SHA(ClientHello.random + ServerHello.random
* + ServerParams);
*/
if ((ret = mbedtls_md5_starts_ret(&mbedtls_md5)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_starts_ret", ret);
goto exit;
}
if ((ret = mbedtls_md5_update_ret(&mbedtls_md5,
ssl->handshake->randbytes, 64)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_update_ret", ret);
goto exit;
}
if ((ret = mbedtls_md5_update_ret(&mbedtls_md5, data, data_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_update_ret", ret);
goto exit;
}
if ((ret = mbedtls_md5_finish_ret(&mbedtls_md5, output)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md5_finish_ret", ret);
goto exit;
}
if ((ret = mbedtls_sha1_starts_ret(&mbedtls_sha1)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_starts_ret", ret);
goto exit;
}
if ((ret = mbedtls_sha1_update_ret(&mbedtls_sha1,
ssl->handshake->randbytes, 64)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_update_ret", ret);
goto exit;
}
if ((ret = mbedtls_sha1_update_ret(&mbedtls_sha1, data,
data_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_update_ret", ret);
goto exit;
}
if ((ret = mbedtls_sha1_finish_ret(&mbedtls_sha1,
output + 16)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_sha1_finish_ret", ret);
goto exit;
}
exit:
mbedtls_md5_free(&mbedtls_md5);
mbedtls_sha1_free(&mbedtls_sha1);
if (ret != 0) {
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR);
}
return ret;
}
#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
MBEDTLS_SSL_PROTO_TLS1_1 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int mbedtls_ssl_get_key_exchange_md_tls1_2(mbedtls_ssl_context *ssl,
unsigned char *hash, size_t *hashlen,
unsigned char *data, size_t data_len,
mbedtls_md_type_t md_alg)
{
psa_status_t status;
psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT;
psa_algorithm_t hash_alg = mbedtls_psa_translate_md(md_alg);
MBEDTLS_SSL_DEBUG_MSG(3, ("Perform PSA-based computation of digest of ServerKeyExchange"));
if ((status = psa_hash_setup(&hash_operation,
hash_alg)) != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_setup", status);
goto exit;
}
if ((status = psa_hash_update(&hash_operation, ssl->handshake->randbytes,
64)) != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_update", status);
goto exit;
}
if ((status = psa_hash_update(&hash_operation,
data, data_len)) != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_update", status);
goto exit;
}
if ((status = psa_hash_finish(&hash_operation, hash, PSA_HASH_MAX_SIZE,
hashlen)) != PSA_SUCCESS) {
MBEDTLS_SSL_DEBUG_RET(1, "psa_hash_finish", status);
goto exit;
}
exit:
if (status != PSA_SUCCESS) {
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR);
switch (status) {
case PSA_ERROR_NOT_SUPPORTED:
return MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE;
case PSA_ERROR_BAD_STATE: /* Intentional fallthrough */
case PSA_ERROR_BUFFER_TOO_SMALL:
return MBEDTLS_ERR_MD_BAD_INPUT_DATA;
case PSA_ERROR_INSUFFICIENT_MEMORY:
return MBEDTLS_ERR_MD_ALLOC_FAILED;
default:
return MBEDTLS_ERR_MD_HW_ACCEL_FAILED;
}
}
return 0;
}
#else
int mbedtls_ssl_get_key_exchange_md_tls1_2(mbedtls_ssl_context *ssl,
unsigned char *hash, size_t *hashlen,
unsigned char *data, size_t data_len,
mbedtls_md_type_t md_alg)
{
int ret = 0;
mbedtls_md_context_t ctx;
const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_alg);
*hashlen = mbedtls_md_get_size(md_info);
MBEDTLS_SSL_DEBUG_MSG(3, ("Perform mbedtls-based computation of digest of ServerKeyExchange"));
mbedtls_md_init(&ctx);
/*
* digitally-signed struct {
* opaque client_random[32];
* opaque server_random[32];
* ServerDHParams params;
* };
*/
if ((ret = mbedtls_md_setup(&ctx, md_info, 0)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_setup", ret);
goto exit;
}
if ((ret = mbedtls_md_starts(&ctx)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_starts", ret);
goto exit;
}
if ((ret = mbedtls_md_update(&ctx, ssl->handshake->randbytes, 64)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_update", ret);
goto exit;
}
if ((ret = mbedtls_md_update(&ctx, data, data_len)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_update", ret);
goto exit;
}
if ((ret = mbedtls_md_finish(&ctx, hash)) != 0) {
MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_md_finish", ret);
goto exit;
}
exit:
mbedtls_md_free(&ctx);
if (ret != 0) {
mbedtls_ssl_send_alert_message(ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR);
}
return ret;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
MBEDTLS_SSL_PROTO_TLS1_2 */
#endif /* MBEDTLS_SSL_TLS_C */