- Renamed include directory to polarssl
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
new file mode 100644
index 0000000..b8dd661
--- /dev/null
+++ b/library/ssl_srv.c
@@ -0,0 +1,930 @@
+/*
+ * SSLv3/TLSv1 server-side functions
+ *
+ * Copyright (C) 2006-2007 Christophe Devine
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "xyssl/config.h"
+
+#if defined(XYSSL_SSL_SRV_C)
+
+#include "xyssl/debug.h"
+#include "xyssl/ssl.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+static int ssl_parse_client_hello( ssl_context *ssl )
+{
+ int ret, i, j, n;
+ int ciph_len, sess_len;
+ int chal_len, comp_len;
+ unsigned char *buf, *p;
+
+ SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
+
+ if( ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
+ return( ret );
+ }
+
+ buf = ssl->in_hdr;
+
+ if( ( buf[0] & 0x80 ) != 0 )
+ {
+ SSL_DEBUG_BUF( 4, "record header", buf, 5 );
+
+ SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d",
+ buf[2] ) );
+ SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d",
+ ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) );
+ SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]",
+ buf[3], buf[4] ) );
+
+ /*
+ * SSLv2 Client Hello
+ *
+ * Record layer:
+ * 0 . 1 message length
+ *
+ * SSL layer:
+ * 2 . 2 message type
+ * 3 . 4 protocol version
+ */
+ if( buf[2] != SSL_HS_CLIENT_HELLO ||
+ buf[3] != SSL_MAJOR_VERSION_3 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF;
+
+ if( n < 17 || n > 512 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ ssl->max_major_ver = buf[3];
+ ssl->max_minor_ver = buf[4];
+
+ ssl->major_ver = SSL_MAJOR_VERSION_3;
+ ssl->minor_ver = ( buf[4] <= SSL_MINOR_VERSION_1 )
+ ? buf[4] : SSL_MINOR_VERSION_1;
+
+ if( ( ret = ssl_fetch_input( ssl, 2 + n ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
+ return( ret );
+ }
+
+ md5_update( &ssl->fin_md5 , buf + 2, n );
+ sha1_update( &ssl->fin_sha1, buf + 2, n );
+
+ buf = ssl->in_msg;
+ n = ssl->in_left - 5;
+
+ /*
+ * 0 . 1 cipherlist length
+ * 2 . 3 session id length
+ * 4 . 5 challenge length
+ * 6 . .. cipherlist
+ * .. . .. session id
+ * .. . .. challenge
+ */
+ SSL_DEBUG_BUF( 4, "record contents", buf, n );
+
+ ciph_len = ( buf[0] << 8 ) | buf[1];
+ sess_len = ( buf[2] << 8 ) | buf[3];
+ chal_len = ( buf[4] << 8 ) | buf[5];
+
+ SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d",
+ ciph_len, sess_len, chal_len ) );
+
+ /*
+ * Make sure each parameter length is valid
+ */
+ if( ciph_len < 3 || ( ciph_len % 3 ) != 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ if( sess_len < 0 || sess_len > 32 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ if( chal_len < 8 || chal_len > 32 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ if( n != 6 + ciph_len + sess_len + chal_len )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ SSL_DEBUG_BUF( 3, "client hello, cipherlist",
+ buf + 6, ciph_len );
+ SSL_DEBUG_BUF( 3, "client hello, session id",
+ buf + 6 + ciph_len, sess_len );
+ SSL_DEBUG_BUF( 3, "client hello, challenge",
+ buf + 6 + ciph_len + sess_len, chal_len );
+
+ p = buf + 6 + ciph_len;
+ ssl->session->length = sess_len;
+ memset( ssl->session->id, 0, sizeof( ssl->session->id ) );
+ memcpy( ssl->session->id, p, ssl->session->length );
+
+ p += sess_len;
+ memset( ssl->randbytes, 0, 64 );
+ memcpy( ssl->randbytes + 32 - chal_len, p, chal_len );
+
+ for( i = 0; ssl->ciphers[i] != 0; i++ )
+ {
+ for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
+ {
+ if( p[0] == 0 &&
+ p[1] == 0 &&
+ p[2] == ssl->ciphers[i] )
+ goto have_cipher;
+ }
+ }
+ }
+ else
+ {
+ SSL_DEBUG_BUF( 4, "record header", buf, 5 );
+
+ SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d",
+ buf[0] ) );
+ SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d",
+ ( buf[3] << 8 ) | buf[4] ) );
+ SSL_DEBUG_MSG( 3, ( "client hello v3, protocol ver: [%d:%d]",
+ buf[1], buf[2] ) );
+
+ /*
+ * SSLv3 Client Hello
+ *
+ * Record layer:
+ * 0 . 0 message type
+ * 1 . 2 protocol version
+ * 3 . 4 message length
+ */
+ if( buf[0] != SSL_MSG_HANDSHAKE ||
+ buf[1] != SSL_MAJOR_VERSION_3 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ n = ( buf[3] << 8 ) | buf[4];
+
+ if( n < 45 || n > 512 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ if( ( ret = ssl_fetch_input( ssl, 5 + n ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
+ return( ret );
+ }
+
+ buf = ssl->in_msg;
+ n = ssl->in_left - 5;
+
+ md5_update( &ssl->fin_md5 , buf, n );
+ sha1_update( &ssl->fin_sha1, buf, n );
+
+ /*
+ * SSL layer:
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 5 protocol version
+ * 6 . 9 UNIX time()
+ * 10 . 37 random bytes
+ * 38 . 38 session id length
+ * 39 . 38+x session id
+ * 39+x . 40+x cipherlist length
+ * 41+x . .. cipherlist
+ * .. . .. compression alg.
+ * .. . .. extensions
+ */
+ SSL_DEBUG_BUF( 4, "record contents", buf, n );
+
+ SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d",
+ buf[0] ) );
+ SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
+ ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) );
+ SSL_DEBUG_MSG( 3, ( "client hello v3, max. version: [%d:%d]",
+ buf[4], buf[5] ) );
+
+ /*
+ * Check the handshake type and protocol version
+ */
+ if( buf[0] != SSL_HS_CLIENT_HELLO ||
+ buf[4] != SSL_MAJOR_VERSION_3 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ ssl->major_ver = SSL_MAJOR_VERSION_3;
+ ssl->minor_ver = ( buf[5] <= SSL_MINOR_VERSION_1 )
+ ? buf[5] : SSL_MINOR_VERSION_1;
+
+ ssl->max_major_ver = buf[4];
+ ssl->max_minor_ver = buf[5];
+
+ memcpy( ssl->randbytes, buf + 6, 32 );
+
+ /*
+ * Check the handshake message length
+ */
+ if( buf[1] != 0 || n != 4 + ( ( buf[2] << 8 ) | buf[3] ) )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ /*
+ * Check the session length
+ */
+ sess_len = buf[38];
+
+ if( sess_len < 0 || sess_len > 32 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ ssl->session->length = sess_len;
+ memset( ssl->session->id, 0, sizeof( ssl->session->id ) );
+ memcpy( ssl->session->id, buf + 39 , ssl->session->length );
+
+ /*
+ * Check the cipherlist length
+ */
+ ciph_len = ( buf[39 + sess_len] << 8 )
+ | ( buf[40 + sess_len] );
+
+ if( ciph_len < 2 || ciph_len > 256 || ( ciph_len % 2 ) != 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ /*
+ * Check the compression algorithms length
+ */
+ comp_len = buf[41 + sess_len + ciph_len];
+
+ if( comp_len < 1 || comp_len > 16 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
+ }
+
+ SSL_DEBUG_BUF( 3, "client hello, random bytes",
+ buf + 6, 32 );
+ SSL_DEBUG_BUF( 3, "client hello, session id",
+ buf + 38, sess_len );
+ SSL_DEBUG_BUF( 3, "client hello, cipherlist",
+ buf + 41 + sess_len, ciph_len );
+ SSL_DEBUG_BUF( 3, "client hello, compression",
+ buf + 42 + sess_len + ciph_len, comp_len );
+
+ /*
+ * Search for a matching cipher
+ */
+ for( i = 0; ssl->ciphers[i] != 0; i++ )
+ {
+ for( j = 0, p = buf + 41 + sess_len; j < ciph_len;
+ j += 2, p += 2 )
+ {
+ if( p[0] == 0 && p[1] == ssl->ciphers[i] )
+ goto have_cipher;
+ }
+ }
+ }
+
+ SSL_DEBUG_MSG( 1, ( "got no ciphers in common" ) );
+
+ return( XYSSL_ERR_SSL_NO_CIPHER_CHOSEN );
+
+have_cipher:
+
+ ssl->session->cipher = ssl->ciphers[i];
+ ssl->in_left = 0;
+ ssl->state++;
+
+ SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
+
+ return( 0 );
+}
+
+static int ssl_write_server_hello( ssl_context *ssl )
+{
+ time_t t;
+ int ret, i, n;
+ unsigned char *buf, *p;
+
+ SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
+
+ /*
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 5 protocol version
+ * 6 . 9 UNIX time()
+ * 10 . 37 random bytes
+ */
+ buf = ssl->out_msg;
+ p = buf + 4;
+
+ *p++ = (unsigned char) ssl->major_ver;
+ *p++ = (unsigned char) ssl->minor_ver;
+
+ SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
+ buf[4], buf[5] ) );
+
+ t = time( NULL );
+ *p++ = (unsigned char)( t >> 24 );
+ *p++ = (unsigned char)( t >> 16 );
+ *p++ = (unsigned char)( t >> 8 );
+ *p++ = (unsigned char)( t );
+
+ SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
+
+ for( i = 28; i > 0; i-- )
+ *p++ = (unsigned char) ssl->f_rng( ssl->p_rng );
+
+ memcpy( ssl->randbytes + 32, buf + 6, 32 );
+
+ SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
+
+ /*
+ * 38 . 38 session id length
+ * 39 . 38+n session id
+ * 39+n . 40+n chosen cipher
+ * 41+n . 41+n chosen compression alg.
+ */
+ ssl->session->length = n = 32;
+ *p++ = (unsigned char) ssl->session->length;
+
+ if( ssl->s_get == NULL ||
+ ssl->s_get( ssl ) != 0 )
+ {
+ /*
+ * Not found, create a new session id
+ */
+ ssl->resume = 0;
+ ssl->state++;
+
+ for( i = 0; i < n; i++ )
+ ssl->session->id[i] =
+ (unsigned char) ssl->f_rng( ssl->p_rng );
+ }
+ else
+ {
+ /*
+ * Found a matching session, resume it
+ */
+ ssl->resume = 1;
+ ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC;
+ ssl_derive_keys( ssl );
+ }
+
+ memcpy( p, ssl->session->id, ssl->session->length );
+ p += ssl->session->length;
+
+ SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
+ SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
+ SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
+ ssl->resume ? "a" : "no" ) );
+
+ *p++ = (unsigned char)( ssl->session->cipher >> 8 );
+ *p++ = (unsigned char)( ssl->session->cipher );
+ *p++ = SSL_COMPRESS_NULL;
+
+ SSL_DEBUG_MSG( 3, ( "server hello, chosen cipher: %d",
+ ssl->session->cipher ) );
+ SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", 0 ) );
+
+ ssl->out_msglen = p - buf;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_SERVER_HELLO;
+
+ ret = ssl_write_record( ssl );
+
+ SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
+
+ return( ret );
+}
+
+static int ssl_write_certificate_request( ssl_context *ssl )
+{
+ int ret, n;
+ unsigned char *buf, *p;
+ x509_cert *crt;
+
+ SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
+
+ ssl->state++;
+
+ if( ssl->authmode == SSL_VERIFY_NONE )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
+ return( 0 );
+ }
+
+ /*
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 4 cert type count
+ * 5 .. n-1 cert types
+ * n .. n+1 length of all DNs
+ * n+2 .. n+3 length of DN 1
+ * n+4 .. ... Distinguished Name #1
+ * ... .. ... length of DN 2, etc.
+ */
+ buf = ssl->out_msg;
+ p = buf + 4;
+
+ /*
+ * At the moment, only RSA certificates are supported
+ */
+ *p++ = 1;
+ *p++ = 1;
+
+ p += 2;
+ crt = ssl->ca_chain;
+
+ while( crt != NULL && crt->next != NULL )
+ {
+ if( p - buf > 4096 )
+ break;
+
+ n = crt->subject_raw.len;
+ *p++ = (unsigned char)( n >> 8 );
+ *p++ = (unsigned char)( n );
+ memcpy( p, crt->subject_raw.p, n );
+
+ SSL_DEBUG_BUF( 3, "requested DN", p, n );
+ p += n; crt = crt->next;
+ }
+
+ ssl->out_msglen = n = p - buf;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_CERTIFICATE_REQUEST;
+ ssl->out_msg[6] = (unsigned char)( ( n - 8 ) >> 8 );
+ ssl->out_msg[7] = (unsigned char)( ( n - 8 ) );
+
+ ret = ssl_write_record( ssl );
+
+ SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
+
+ return( ret );
+}
+
+static int ssl_write_server_key_exchange( ssl_context *ssl )
+{
+ int ret, n;
+ unsigned char hash[36];
+ md5_context md5;
+ sha1_context sha1;
+
+ SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
+
+ if( ssl->session->cipher != SSL_EDH_RSA_DES_168_SHA &&
+ ssl->session->cipher != SSL_EDH_RSA_AES_256_SHA )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if !defined(XYSSL_DHM_C)
+ SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) );
+ return( XYSSL_ERR_SSL_FEATURE_UNAVAILABLE );
+#else
+ /*
+ * Ephemeral DH parameters:
+ *
+ * struct {
+ * opaque dh_p<1..2^16-1>;
+ * opaque dh_g<1..2^16-1>;
+ * opaque dh_Ys<1..2^16-1>;
+ * } ServerDHParams;
+ */
+ if( ( ret = dhm_make_params( &ssl->dhm_ctx, 256, ssl->out_msg + 4,
+ &n, ssl->f_rng, ssl->p_rng ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "dhm_make_params", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->dhm_ctx.X );
+ SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->dhm_ctx.P );
+ SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->dhm_ctx.G );
+ SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->dhm_ctx.GX );
+
+ /*
+ * 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);
+ */
+ md5_starts( &md5 );
+ md5_update( &md5, ssl->randbytes, 64 );
+ md5_update( &md5, ssl->out_msg + 4, n );
+ md5_finish( &md5, hash );
+
+ sha1_starts( &sha1 );
+ sha1_update( &sha1, ssl->randbytes, 64 );
+ sha1_update( &sha1, ssl->out_msg + 4, n );
+ sha1_finish( &sha1, hash + 16 );
+
+ SSL_DEBUG_BUF( 3, "parameters hash", hash, 36 );
+
+ ssl->out_msg[4 + n] = (unsigned char)( ssl->rsa_key->len >> 8 );
+ ssl->out_msg[5 + n] = (unsigned char)( ssl->rsa_key->len );
+
+ ret = rsa_pkcs1_sign( ssl->rsa_key, RSA_PRIVATE,
+ RSA_RAW, 36, hash, ssl->out_msg + 6 + n );
+ if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, "rsa_pkcs1_sign", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_BUF( 3, "my RSA sig", ssl->out_msg + 6 + n,
+ ssl->rsa_key->len );
+
+ ssl->out_msglen = 6 + n + ssl->rsa_key->len;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_SERVER_KEY_EXCHANGE;
+
+ ssl->state++;
+
+ if( ( ret = ssl_write_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_write_record", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) );
+
+ return( 0 );
+#endif
+}
+
+static int ssl_write_server_hello_done( ssl_context *ssl )
+{
+ int ret;
+
+ SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
+
+ ssl->out_msglen = 4;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_SERVER_HELLO_DONE;
+
+ ssl->state++;
+
+ if( ( ret = ssl_write_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_write_record", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) );
+
+ return( 0 );
+}
+
+static int ssl_parse_client_key_exchange( ssl_context *ssl )
+{
+ int ret, i, n;
+
+ SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
+
+ if( ( ret = ssl_read_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_read_record", ret );
+ return( ret );
+ }
+
+ if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
+ }
+
+ if( ssl->in_msg[0] != SSL_HS_CLIENT_KEY_EXCHANGE )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
+ }
+
+ if( ssl->session->cipher == SSL_EDH_RSA_DES_168_SHA ||
+ ssl->session->cipher == SSL_EDH_RSA_AES_256_SHA )
+ {
+#if !defined(XYSSL_DHM_C)
+ SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) );
+ return( XYSSL_ERR_SSL_FEATURE_UNAVAILABLE );
+#else
+ /*
+ * Receive G^Y mod P, premaster = (G^Y)^X mod P
+ */
+ n = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
+
+ if( n < 1 || n > ssl->dhm_ctx.len ||
+ n + 6 != ssl->in_hslen )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
+ }
+
+ if( ( ret = dhm_read_public( &ssl->dhm_ctx,
+ ssl->in_msg + 6, n ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "dhm_read_public", ret );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE | ret );
+ }
+
+ SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->dhm_ctx.GY );
+
+ ssl->pmslen = ssl->dhm_ctx.len;
+
+ if( ( ret = dhm_calc_secret( &ssl->dhm_ctx,
+ ssl->premaster, &ssl->pmslen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE | ret );
+ }
+
+ SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->dhm_ctx.K );
+#endif
+ }
+ else
+ {
+ /*
+ * Decrypt the premaster using own private RSA key
+ */
+ i = 4;
+ n = ssl->rsa_key->len;
+ ssl->pmslen = 48;
+
+ if( ssl->minor_ver != SSL_MINOR_VERSION_0 )
+ {
+ i += 2;
+ if( ssl->in_msg[4] != ( ( n >> 8 ) & 0xFF ) ||
+ ssl->in_msg[5] != ( ( n ) & 0xFF ) )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
+ }
+ }
+
+ if( ssl->in_hslen != i + n )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
+ }
+
+ ret = rsa_pkcs1_decrypt( ssl->rsa_key, RSA_PRIVATE, &ssl->pmslen,
+ ssl->in_msg + i, ssl->premaster );
+
+ if( ret != 0 || ssl->pmslen != 48 ||
+ ssl->premaster[0] != ssl->max_major_ver ||
+ ssl->premaster[1] != ssl->max_minor_ver )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
+
+ /*
+ * Protection against Bleichenbacher's attack:
+ * invalid PKCS#1 v1.5 padding must not cause
+ * the connection to end immediately; instead,
+ * send a bad_record_mac later in the handshake.
+ */
+ ssl->pmslen = 48;
+
+ for( i = 0; i < ssl->pmslen; i++ )
+ ssl->premaster[i] = (unsigned char) ssl->f_rng( ssl->p_rng );
+ }
+ }
+
+ ssl_derive_keys( ssl );
+
+ if( ssl->s_set != NULL )
+ ssl->s_set( ssl );
+
+ ssl->state++;
+
+ SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
+
+ return( 0 );
+}
+
+static int ssl_parse_certificate_verify( ssl_context *ssl )
+{
+ int n1, n2, ret;
+ unsigned char hash[36];
+
+ SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
+
+ if( ssl->peer_cert == NULL )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ ssl_calc_verify( ssl, hash );
+
+ if( ( ret = ssl_read_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_read_record", ret );
+ return( ret );
+ }
+
+ ssl->state++;
+
+ if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
+ }
+
+ if( ssl->in_msg[0] != SSL_HS_CERTIFICATE_VERIFY )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
+ }
+
+ n1 = ssl->peer_cert->rsa.len;
+ n2 = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
+
+ if( n1 + 6 != ssl->in_hslen || n1 != n2 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
+ return( XYSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
+ }
+
+ ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC,
+ RSA_RAW, 36, hash, ssl->in_msg + 6 );
+ if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
+
+ return( 0 );
+}
+
+/*
+ * SSL handshake -- server side
+ */
+int ssl_handshake_server( ssl_context *ssl )
+{
+ int ret = 0;
+
+ SSL_DEBUG_MSG( 2, ( "=> handshake server" ) );
+
+ while( ssl->state != SSL_HANDSHAKE_OVER )
+ {
+ SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
+
+ if( ( ret = ssl_flush_output( ssl ) ) != 0 )
+ break;
+
+ switch( ssl->state )
+ {
+ case SSL_HELLO_REQUEST:
+ ssl->state = SSL_CLIENT_HELLO;
+ break;
+
+ /*
+ * <== ClientHello
+ */
+ case SSL_CLIENT_HELLO:
+ ret = ssl_parse_client_hello( ssl );
+ break;
+
+ /*
+ * ==> ServerHello
+ * Certificate
+ * ( ServerKeyExchange )
+ * ( CertificateRequest )
+ * ServerHelloDone
+ */
+ case SSL_SERVER_HELLO:
+ ret = ssl_write_server_hello( ssl );
+ break;
+
+ case SSL_SERVER_CERTIFICATE:
+ ret = ssl_write_certificate( ssl );
+ break;
+
+ case SSL_SERVER_KEY_EXCHANGE:
+ ret = ssl_write_server_key_exchange( ssl );
+ break;
+
+ case SSL_CERTIFICATE_REQUEST:
+ ret = ssl_write_certificate_request( ssl );
+ break;
+
+ case SSL_SERVER_HELLO_DONE:
+ ret = ssl_write_server_hello_done( ssl );
+ break;
+
+ /*
+ * <== ( Certificate/Alert )
+ * ClientKeyExchange
+ * ( CertificateVerify )
+ * ChangeCipherSpec
+ * Finished
+ */
+ case SSL_CLIENT_CERTIFICATE:
+ ret = ssl_parse_certificate( ssl );
+ break;
+
+ case SSL_CLIENT_KEY_EXCHANGE:
+ ret = ssl_parse_client_key_exchange( ssl );
+ break;
+
+ case SSL_CERTIFICATE_VERIFY:
+ ret = ssl_parse_certificate_verify( ssl );
+ break;
+
+ case SSL_CLIENT_CHANGE_CIPHER_SPEC:
+ ret = ssl_parse_change_cipher_spec( ssl );
+ break;
+
+ case SSL_CLIENT_FINISHED:
+ ret = ssl_parse_finished( ssl );
+ break;
+
+ /*
+ * ==> ChangeCipherSpec
+ * Finished
+ */
+ case SSL_SERVER_CHANGE_CIPHER_SPEC:
+ ret = ssl_write_change_cipher_spec( ssl );
+ break;
+
+ case SSL_SERVER_FINISHED:
+ ret = ssl_write_finished( ssl );
+ break;
+
+ case SSL_FLUSH_BUFFERS:
+ SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
+ ssl->state = SSL_HANDSHAKE_OVER;
+ break;
+
+ default:
+ SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
+ return( XYSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ if( ret != 0 )
+ break;
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= handshake server" ) );
+
+ return( ret );
+}
+
+#endif