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Diffstat (limited to 'polarssl/src/library/ssl_cli.c')
-rw-r--r--polarssl/src/library/ssl_cli.c1130
1 files changed, 1130 insertions, 0 deletions
diff --git a/polarssl/src/library/ssl_cli.c b/polarssl/src/library/ssl_cli.c
new file mode 100644
index 0000000..99120d5
--- /dev/null
+++ b/polarssl/src/library/ssl_cli.c
@@ -0,0 +1,1130 @@
+/*
+ * SSLv3/TLSv1 client-side functions
+ *
+ * Copyright (C) 2006-2012, Brainspark B.V.
+ *
+ * This file is part of PolarSSL (http://www.polarssl.org)
+ * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ * All rights reserved.
+ *
+ * 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 "polarssl/config.h"
+
+#if defined(POLARSSL_SSL_CLI_C)
+
+#include "polarssl/debug.h"
+#include "polarssl/ssl.h"
+
+#if defined(POLARSSL_PKCS11_C)
+#include "polarssl/pkcs11.h"
+#endif /* defined(POLARSSL_PKCS11_C) */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#if defined(POLARSSL_SHA4_C)
+#include "polarssl/sha4.h"
+#endif
+
+static int ssl_write_client_hello( ssl_context *ssl )
+{
+ int ret;
+ size_t i, n, ext_len = 0;
+ unsigned char *buf;
+ unsigned char *p;
+ time_t t;
+ unsigned char sig_alg_list[20];
+ size_t sig_alg_len = 0;
+
+ SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
+
+ ssl->major_ver = SSL_MAJOR_VERSION_3;
+ ssl->minor_ver = SSL_MINOR_VERSION_0;
+
+ if( ssl->max_major_ver == 0 && ssl->max_minor_ver == 0 )
+ {
+ ssl->max_major_ver = SSL_MAJOR_VERSION_3;
+ ssl->max_minor_ver = SSL_MINOR_VERSION_3;
+ }
+
+ /*
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 5 highest version supported
+ * 6 . 9 current UNIX time
+ * 10 . 37 random bytes
+ */
+ buf = ssl->out_msg;
+ p = buf + 4;
+
+ *p++ = (unsigned char) ssl->max_major_ver;
+ *p++ = (unsigned char) ssl->max_minor_ver;
+
+ SSL_DEBUG_MSG( 3, ( "client hello, max 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, ( "client hello, current time: %lu", t ) );
+
+ if( ( ret = ssl->f_rng( ssl->p_rng, p, 28 ) ) != 0 )
+ return( ret );
+
+ p += 28;
+
+ memcpy( ssl->randbytes, buf + 6, 32 );
+
+ SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 6, 32 );
+
+ /*
+ * 38 . 38 session id length
+ * 39 . 39+n session id
+ * 40+n . 41+n ciphersuitelist length
+ * 42+n . .. ciphersuitelist
+ * .. . .. compression methods length
+ * .. . .. compression methods
+ * .. . .. extensions length
+ * .. . .. extensions
+ */
+ n = ssl->session->length;
+
+ if( n < 16 || n > 32 || ssl->resume == 0 ||
+ ( ssl->timeout != 0 && t - ssl->session->start > ssl->timeout ) )
+ n = 0;
+
+ *p++ = (unsigned char) n;
+
+ for( i = 0; i < n; i++ )
+ *p++ = ssl->session->id[i];
+
+ SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
+ SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
+
+ for( n = 0; ssl->ciphersuites[n] != 0; n++ );
+ *p++ = (unsigned char)( n >> 7 );
+ *p++ = (unsigned char)( n << 1 );
+
+ SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
+
+ for( i = 0; i < n; i++ )
+ {
+ SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %2d",
+ ssl->ciphersuites[i] ) );
+
+ *p++ = (unsigned char)( ssl->ciphersuites[i] >> 8 );
+ *p++ = (unsigned char)( ssl->ciphersuites[i] );
+ }
+
+ SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
+ SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", 0 ) );
+
+ *p++ = 1;
+ *p++ = SSL_COMPRESS_NULL;
+
+ if ( ssl->hostname != NULL )
+ {
+ SSL_DEBUG_MSG( 3, ( "client hello, prepping for server name extension: %s",
+ ssl->hostname ) );
+
+ ext_len += ssl->hostname_len + 9;
+ }
+
+ /*
+ * Prepare signature_algorithms extension (TLS 1.2)
+ */
+ if( ssl->max_minor_ver == SSL_MINOR_VERSION_3 )
+ {
+#if defined(POLARSSL_SHA4_C)
+ sig_alg_list[sig_alg_len++] = SSL_HASH_SHA512;
+ sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
+ sig_alg_list[sig_alg_len++] = SSL_HASH_SHA384;
+ sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
+#endif
+#if defined(POLARSSL_SHA2_C)
+ sig_alg_list[sig_alg_len++] = SSL_HASH_SHA256;
+ sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
+ sig_alg_list[sig_alg_len++] = SSL_HASH_SHA224;
+ sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
+#endif
+#if defined(POLARSSL_SHA1_C)
+ sig_alg_list[sig_alg_len++] = SSL_HASH_SHA1;
+ sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
+#endif
+#if defined(POLARSSL_MD5_C)
+ sig_alg_list[sig_alg_len++] = SSL_HASH_MD5;
+ sig_alg_list[sig_alg_len++] = SSL_SIG_RSA;
+#endif
+ ext_len = 6 + sig_alg_len;
+ }
+
+ SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
+ ext_len ) );
+
+ *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( ext_len ) & 0xFF );
+
+ if ( ssl->hostname != NULL )
+ {
+ /*
+ * struct {
+ * NameType name_type;
+ * select (name_type) {
+ * case host_name: HostName;
+ * } name;
+ * } ServerName;
+ *
+ * enum {
+ * host_name(0), (255)
+ * } NameType;
+ *
+ * opaque HostName<1..2^16-1>;
+ *
+ * struct {
+ * ServerName server_name_list<1..2^16-1>
+ * } ServerNameList;
+ */
+ SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s",
+ ssl->hostname ) );
+
+ *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME ) & 0xFF );
+
+ *p++ = (unsigned char)( ( (ssl->hostname_len + 5) >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( (ssl->hostname_len + 5) ) & 0xFF );
+
+ *p++ = (unsigned char)( ( (ssl->hostname_len + 3) >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( (ssl->hostname_len + 3) ) & 0xFF );
+
+ *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->hostname_len >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( ssl->hostname_len ) & 0xFF );
+
+ memcpy( p, ssl->hostname, ssl->hostname_len );
+
+ p += ssl->hostname_len;
+ }
+
+ if( ssl->max_minor_ver == SSL_MINOR_VERSION_3 )
+ {
+ /*
+ * enum {
+ * none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5),
+ * sha512(6), (255)
+ * } HashAlgorithm;
+ *
+ * enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
+ * SignatureAlgorithm;
+ *
+ * struct {
+ * HashAlgorithm hash;
+ * SignatureAlgorithm signature;
+ * } SignatureAndHashAlgorithm;
+ *
+ * SignatureAndHashAlgorithm
+ * supported_signature_algorithms<2..2^16-2>;
+ */
+ SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) );
+
+ *p++ = (unsigned char)( ( TLS_EXT_SIG_ALG >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( TLS_EXT_SIG_ALG ) & 0xFF );
+
+ *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF );
+
+ *p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF );
+ *p++ = (unsigned char)( ( sig_alg_len ) & 0xFF );
+
+ memcpy( p, sig_alg_list, sig_alg_len );
+
+ p += sig_alg_len;
+ }
+
+ ssl->out_msglen = p - buf;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_CLIENT_HELLO;
+
+ ssl->state++;
+
+ if( ( ret = ssl_write_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_write_record", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= write client hello" ) );
+
+ return( 0 );
+}
+
+static int ssl_parse_server_hello( ssl_context *ssl )
+{
+#if defined(POLARSSL_DEBUG_C)
+ time_t t;
+#endif
+ int ret, i;
+ size_t n;
+ int ext_len;
+ unsigned char *buf;
+
+ SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
+
+ /*
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 5 protocol version
+ * 6 . 9 UNIX time()
+ * 10 . 37 random bytes
+ */
+ buf = ssl->in_msg;
+
+ 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 server hello message" ) );
+ return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
+ buf[4], buf[5] ) );
+
+ if( ssl->in_hslen < 42 ||
+ buf[0] != SSL_HS_SERVER_HELLO ||
+ buf[4] != SSL_MAJOR_VERSION_3 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
+ }
+
+ if( buf[5] > ssl->max_minor_ver )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
+ }
+
+ ssl->minor_ver = buf[5];
+
+#if defined(POLARSSL_DEBUG_C)
+ t = ( (time_t) buf[6] << 24 )
+ | ( (time_t) buf[7] << 16 )
+ | ( (time_t) buf[8] << 8 )
+ | ( (time_t) buf[9] );
+#endif
+
+ memcpy( ssl->randbytes + 32, buf + 6, 32 );
+
+ n = buf[38];
+
+ SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
+ 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 ciphersuite
+ * 41+n . 41+n chosen compression alg.
+ * 42+n . 43+n extensions length
+ * 44+n . 44+n+m extensions
+ */
+ if( n > 32 || ssl->in_hslen > 42 + n )
+ {
+ ext_len = ( ( buf[42 + n] << 8 )
+ | ( buf[43 + n] ) ) + 2;
+ }
+ else
+ {
+ ext_len = 0;
+ }
+
+ if( n > 32 || ssl->in_hslen != 42 + n + ext_len )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
+ }
+
+ i = ( buf[39 + n] << 8 ) | buf[40 + n];
+
+ /*
+ * Initialize update checksum functions
+ */
+ ssl_kickstart_checksum( ssl, i, buf, ssl->in_hslen );
+
+ SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
+ SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
+
+ /*
+ * Check if the session can be resumed
+ */
+ if( ssl->resume == 0 || n == 0 ||
+ ssl->session->ciphersuite != i ||
+ ssl->session->length != n ||
+ memcmp( ssl->session->id, buf + 39, n ) != 0 )
+ {
+ ssl->state++;
+ ssl->resume = 0;
+ ssl->session->start = time( NULL );
+ ssl->session->ciphersuite = i;
+ ssl->session->length = n;
+ memcpy( ssl->session->id, buf + 39, n );
+ }
+ else
+ {
+ ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC;
+
+ if( ( ret = ssl_derive_keys( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_derive_keys", ret );
+ return( ret );
+ }
+ }
+
+ SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
+ ssl->resume ? "a" : "no" ) );
+
+ SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %d", i ) );
+ SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[41 + n] ) );
+
+ i = 0;
+ while( 1 )
+ {
+ if( ssl->ciphersuites[i] == 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
+ }
+
+ if( ssl->ciphersuites[i++] == ssl->session->ciphersuite )
+ break;
+ }
+
+ if( buf[41 + n] != SSL_COMPRESS_NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
+ }
+
+ /* TODO: Process extensions */
+
+ SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
+
+ return( 0 );
+}
+
+static int ssl_parse_server_key_exchange( ssl_context *ssl )
+{
+#if defined(POLARSSL_DHM_C)
+ int ret;
+ size_t n;
+ unsigned char *p, *end;
+ unsigned char hash[64];
+ md5_context md5;
+ sha1_context sha1;
+ int hash_id = SIG_RSA_RAW;
+ unsigned int hashlen = 0;
+#endif
+
+ SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
+
+ if( ssl->session->ciphersuite != SSL_EDH_RSA_DES_SHA &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_DES_168_SHA &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_SHA &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_SHA &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_SHA256 &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_SHA256 &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_128_SHA &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_256_SHA &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_128_SHA256 &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_256_SHA256 &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_GCM_SHA256 &&
+ ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_GCM_SHA384 )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if !defined(POLARSSL_DHM_C)
+ SSL_DEBUG_MSG( 1, ( "support for dhm in not available" ) );
+ return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
+#else
+ 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 server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ if( ssl->in_msg[0] != SSL_HS_SERVER_KEY_EXCHANGE )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
+ }
+
+ SSL_DEBUG_BUF( 3, "server key exchange", ssl->in_msg + 4, ssl->in_hslen - 4 );
+
+ /*
+ * 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;
+ */
+ p = ssl->in_msg + 4;
+ end = ssl->in_msg + ssl->in_hslen;
+
+ if( ( ret = dhm_read_params( &ssl->dhm_ctx, &p, end ) ) != 0 )
+ {
+ SSL_DEBUG_MSG( 2, ( "DHM Read Params returned -0x%x", -ret ) );
+ SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
+ }
+
+ if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
+ {
+ if( p[1] != SSL_SIG_RSA )
+ {
+ SSL_DEBUG_MSG( 2, ( "Server used unsupported SignatureAlgorithm %d", p[1] ) );
+ SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
+ }
+
+ switch( p[0] )
+ {
+#if defined(POLARSSL_MD5_C)
+ case SSL_HASH_MD5:
+ hash_id = SIG_RSA_MD5;
+ break;
+#endif
+#if defined(POLARSSL_SHA1_C)
+ case SSL_HASH_SHA1:
+ hash_id = SIG_RSA_SHA1;
+ break;
+#endif
+#if defined(POLARSSL_SHA2_C)
+ case SSL_HASH_SHA224:
+ hash_id = SIG_RSA_SHA224;
+ break;
+ case SSL_HASH_SHA256:
+ hash_id = SIG_RSA_SHA256;
+ break;
+#endif
+#if defined(POLARSSL_SHA4_C)
+ case SSL_HASH_SHA384:
+ hash_id = SIG_RSA_SHA384;
+ break;
+ case SSL_HASH_SHA512:
+ hash_id = SIG_RSA_SHA512;
+ break;
+#endif
+ default:
+ SSL_DEBUG_MSG( 2, ( "Server used unsupported HashAlgorithm %d", p[0] ) );
+ SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", p[1] ) );
+ SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", p[0] ) );
+ p += 2;
+ }
+
+ n = ( p[0] << 8 ) | p[1];
+ p += 2;
+
+ if( end != p + n )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
+ }
+
+ if( (unsigned int)( end - p ) != ssl->peer_cert->rsa.len )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
+ }
+
+ if( ssl->dhm_ctx.len < 64 || ssl->dhm_ctx.len > 512 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
+ }
+
+ 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: GY", &ssl->dhm_ctx.GY );
+
+ if( ssl->minor_ver != SSL_MINOR_VERSION_3 )
+ {
+ /*
+ * 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);
+ */
+ n = ssl->in_hslen - ( end - p ) - 6;
+
+ md5_starts( &md5 );
+ md5_update( &md5, ssl->randbytes, 64 );
+ md5_update( &md5, ssl->in_msg + 4, n );
+ md5_finish( &md5, hash );
+
+ sha1_starts( &sha1 );
+ sha1_update( &sha1, ssl->randbytes, 64 );
+ sha1_update( &sha1, ssl->in_msg + 4, n );
+ sha1_finish( &sha1, hash + 16 );
+
+ hash_id = SIG_RSA_RAW;
+ hashlen = 36;
+ }
+ else
+ {
+ sha2_context sha2;
+ sha4_context sha4;
+
+ n = ssl->in_hslen - ( end - p ) - 8;
+
+ /*
+ * digitally-signed struct {
+ * opaque client_random[32];
+ * opaque server_random[32];
+ * ServerDHParams params;
+ * };
+ */
+ switch( hash_id )
+ {
+#if defined(POLARSSL_MD5_C)
+ case SIG_RSA_MD5:
+ md5_starts( &md5 );
+ md5_update( &md5, ssl->randbytes, 64 );
+ md5_update( &md5, ssl->in_msg + 4, n );
+ md5_finish( &md5, hash );
+ hashlen = 16;
+ break;
+#endif
+#if defined(POLARSSL_SHA1_C)
+ case SIG_RSA_SHA1:
+ sha1_starts( &sha1 );
+ sha1_update( &sha1, ssl->randbytes, 64 );
+ sha1_update( &sha1, ssl->in_msg + 4, n );
+ sha1_finish( &sha1, hash );
+ hashlen = 20;
+ break;
+#endif
+#if defined(POLARSSL_SHA2_C)
+ case SIG_RSA_SHA224:
+ sha2_starts( &sha2, 1 );
+ sha2_update( &sha2, ssl->randbytes, 64 );
+ sha2_update( &sha2, ssl->in_msg + 4, n );
+ sha2_finish( &sha2, hash );
+ hashlen = 28;
+ break;
+ case SIG_RSA_SHA256:
+ sha2_starts( &sha2, 0 );
+ sha2_update( &sha2, ssl->randbytes, 64 );
+ sha2_update( &sha2, ssl->in_msg + 4, n );
+ sha2_finish( &sha2, hash );
+ hashlen = 32;
+ break;
+#endif
+#if defined(POLARSSL_SHA4_C)
+ case SIG_RSA_SHA384:
+ sha4_starts( &sha4, 1 );
+ sha4_update( &sha4, ssl->randbytes, 64 );
+ sha4_update( &sha4, ssl->in_msg + 4, n );
+ sha4_finish( &sha4, hash );
+ hashlen = 48;
+ break;
+ case SIG_RSA_SHA512:
+ sha4_starts( &sha4, 0 );
+ sha4_update( &sha4, ssl->randbytes, 64 );
+ sha4_update( &sha4, ssl->in_msg + 4, n );
+ sha4_finish( &sha4, hash );
+ hashlen = 64;
+ break;
+#endif
+ }
+ }
+
+ SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
+
+ if( ( ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC,
+ hash_id, hashlen, hash, p ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret );
+ return( ret );
+ }
+
+ ssl->state++;
+
+ SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
+
+ return( 0 );
+#endif
+}
+
+static int ssl_parse_certificate_request( ssl_context *ssl )
+{
+ int ret;
+
+ SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
+
+ /*
+ * 0 . 0 handshake type
+ * 1 . 3 handshake length
+ * 4 . 5 SSL version
+ * 6 . 6 cert type count
+ * 7 .. 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.
+ */
+ 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 certificate request message" ) );
+ return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+
+ ssl->client_auth = 0;
+ ssl->state++;
+
+ if( ssl->in_msg[0] == SSL_HS_CERTIFICATE_REQUEST )
+ ssl->client_auth++;
+
+ SSL_DEBUG_MSG( 3, ( "got %s certificate request",
+ ssl->client_auth ? "a" : "no" ) );
+
+ SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
+
+ return( 0 );
+}
+
+static int ssl_parse_server_hello_done( ssl_context *ssl )
+{
+ int ret;
+
+ SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
+
+ if( ssl->client_auth != 0 )
+ {
+ 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 server hello done message" ) );
+ return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+ }
+
+ if( ssl->in_hslen != 4 ||
+ ssl->in_msg[0] != SSL_HS_SERVER_HELLO_DONE )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE );
+ }
+
+ ssl->state++;
+
+ SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) );
+
+ return( 0 );
+}
+
+static int ssl_write_client_key_exchange( ssl_context *ssl )
+{
+ int ret;
+ size_t i, n;
+
+ SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );
+
+ if( ssl->session->ciphersuite == SSL_EDH_RSA_DES_SHA ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_DES_168_SHA ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA256 ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA256 ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA256 ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA256 ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_GCM_SHA256 ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 )
+ {
+#if !defined(POLARSSL_DHM_C)
+ SSL_DEBUG_MSG( 1, ( "support for dhm in not available" ) );
+ return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
+#else
+ /*
+ * DHM key exchange -- send G^X mod P
+ */
+ n = ssl->dhm_ctx.len;
+
+ ssl->out_msg[4] = (unsigned char)( n >> 8 );
+ ssl->out_msg[5] = (unsigned char)( n );
+ i = 6;
+
+ ret = dhm_make_public( &ssl->dhm_ctx, 256,
+ &ssl->out_msg[i], n,
+ ssl->f_rng, ssl->p_rng );
+ if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, "dhm_make_public", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->dhm_ctx.X );
+ SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->dhm_ctx.GX );
+
+ 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( ret );
+ }
+
+ SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->dhm_ctx.K );
+#endif
+ }
+ else
+ {
+ /*
+ * RSA key exchange -- send rsa_public(pkcs1 v1.5(premaster))
+ */
+ ssl->premaster[0] = (unsigned char) ssl->max_major_ver;
+ ssl->premaster[1] = (unsigned char) ssl->max_minor_ver;
+ ssl->pmslen = 48;
+
+ ret = ssl->f_rng( ssl->p_rng, ssl->premaster + 2, ssl->pmslen - 2 );
+ if( ret != 0 )
+ return( ret );
+
+ i = 4;
+ n = ssl->peer_cert->rsa.len;
+
+ if( ssl->minor_ver != SSL_MINOR_VERSION_0 )
+ {
+ i += 2;
+ ssl->out_msg[4] = (unsigned char)( n >> 8 );
+ ssl->out_msg[5] = (unsigned char)( n );
+ }
+
+ ret = rsa_pkcs1_encrypt( &ssl->peer_cert->rsa,
+ ssl->f_rng, ssl->p_rng,
+ RSA_PUBLIC,
+ ssl->pmslen, ssl->premaster,
+ ssl->out_msg + i );
+ if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, "rsa_pkcs1_encrypt", ret );
+ return( ret );
+ }
+ }
+
+ if( ( ret = ssl_derive_keys( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_derive_keys", ret );
+ return( ret );
+ }
+
+ ssl->out_msglen = i + n;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_CLIENT_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 client key exchange" ) );
+
+ return( 0 );
+}
+
+static int ssl_write_certificate_verify( ssl_context *ssl )
+{
+ int ret = 0;
+ size_t n = 0, offset = 0;
+ unsigned char hash[48];
+ int hash_id = SIG_RSA_RAW;
+ unsigned int hashlen = 36;
+
+ SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
+
+ if( ssl->client_auth == 0 || ssl->own_cert == NULL )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
+ {
+ // TODO TLS1.2 Should be based on allowed signature algorithm received in
+ // Certificate Request according to RFC 5246. But OpenSSL only allows
+ // SHA256 and SHA384. Find out why OpenSSL does this.
+ //
+ if( ssl->session->ciphersuite == SSL_RSA_AES_256_GCM_SHA384 ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 )
+ {
+ hash_id = SIG_RSA_SHA384;
+ hashlen = 48;
+ }
+ else
+ {
+ hash_id = SIG_RSA_SHA256;
+ hashlen = 32;
+ }
+ }
+
+ if( ssl->rsa_key == NULL )
+ {
+#if defined(POLARSSL_PKCS11_C)
+ if( ssl->pkcs11_key == NULL )
+ {
+#endif /* defined(POLARSSL_PKCS11_C) */
+ SSL_DEBUG_MSG( 1, ( "got no private key" ) );
+ return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
+#if defined(POLARSSL_PKCS11_C)
+ }
+#endif /* defined(POLARSSL_PKCS11_C) */
+ }
+
+ /*
+ * Make an RSA signature of the handshake digests
+ */
+ ssl->calc_verify( ssl, hash );
+
+ if ( ssl->rsa_key )
+ n = ssl->rsa_key->len;
+#if defined(POLARSSL_PKCS11_C)
+ else
+ n = ssl->pkcs11_key->len;
+#endif /* defined(POLARSSL_PKCS11_C) */
+
+ if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
+ {
+ // TODO TLS1.2 Should be based on allowed signature algorithm received in
+ // Certificate Request according to RFC 5246. But OpenSSL only allows
+ // SHA256 and SHA384. Find out why OpenSSL does this.
+ //
+ if( ssl->session->ciphersuite == SSL_RSA_AES_256_GCM_SHA384 ||
+ ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 )
+ {
+ ssl->out_msg[4] = SSL_HASH_SHA384;
+ ssl->out_msg[5] = SSL_SIG_RSA;
+ }
+ else
+ {
+ ssl->out_msg[4] = SSL_HASH_SHA256;
+ ssl->out_msg[5] = SSL_SIG_RSA;
+ }
+
+ offset = 2;
+ }
+
+ ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 );
+ ssl->out_msg[5 + offset] = (unsigned char)( n );
+
+ if( ssl->rsa_key )
+ {
+ ret = rsa_pkcs1_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng,
+ RSA_PRIVATE, hash_id,
+ hashlen, hash, ssl->out_msg + 6 + offset );
+ } else {
+#if defined(POLARSSL_PKCS11_C)
+ ret = pkcs11_sign( ssl->pkcs11_key, RSA_PRIVATE, hash_id,
+ hashlen, hash, ssl->out_msg + 6 + offset );
+#endif /* defined(POLARSSL_PKCS11_C) */
+ }
+
+ if (ret != 0)
+ {
+ SSL_DEBUG_RET( 1, "pkcs1_sign", ret );
+ return( ret );
+ }
+
+ ssl->out_msglen = 6 + n + offset;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_CERTIFICATE_VERIFY;
+
+ ssl->state++;
+
+ if( ( ret = ssl_write_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_write_record", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
+
+ return( 0 );
+}
+
+/*
+ * SSL handshake -- client side
+ */
+int ssl_handshake_client( ssl_context *ssl )
+{
+ int ret = 0;
+
+ SSL_DEBUG_MSG( 2, ( "=> handshake client" ) );
+
+ while( ssl->state != SSL_HANDSHAKE_OVER )
+ {
+ SSL_DEBUG_MSG( 2, ( "client 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_write_client_hello( ssl );
+ break;
+
+ /*
+ * <== ServerHello
+ * Certificate
+ * ( ServerKeyExchange )
+ * ( CertificateRequest )
+ * ServerHelloDone
+ */
+ case SSL_SERVER_HELLO:
+ ret = ssl_parse_server_hello( ssl );
+ break;
+
+ case SSL_SERVER_CERTIFICATE:
+ ret = ssl_parse_certificate( ssl );
+ break;
+
+ case SSL_SERVER_KEY_EXCHANGE:
+ ret = ssl_parse_server_key_exchange( ssl );
+ break;
+
+ case SSL_CERTIFICATE_REQUEST:
+ ret = ssl_parse_certificate_request( ssl );
+ break;
+
+ case SSL_SERVER_HELLO_DONE:
+ ret = ssl_parse_server_hello_done( ssl );
+ break;
+
+ /*
+ * ==> ( Certificate/Alert )
+ * ClientKeyExchange
+ * ( CertificateVerify )
+ * ChangeCipherSpec
+ * Finished
+ */
+ case SSL_CLIENT_CERTIFICATE:
+ ret = ssl_write_certificate( ssl );
+ break;
+
+ case SSL_CLIENT_KEY_EXCHANGE:
+ ret = ssl_write_client_key_exchange( ssl );
+ break;
+
+ case SSL_CERTIFICATE_VERIFY:
+ ret = ssl_write_certificate_verify( ssl );
+ break;
+
+ case SSL_CLIENT_CHANGE_CIPHER_SPEC:
+ ret = ssl_write_change_cipher_spec( ssl );
+ break;
+
+ case SSL_CLIENT_FINISHED:
+ ret = ssl_write_finished( ssl );
+ break;
+
+ /*
+ * <== ChangeCipherSpec
+ * Finished
+ */
+ case SSL_SERVER_CHANGE_CIPHER_SPEC:
+ ret = ssl_parse_change_cipher_spec( ssl );
+ break;
+
+ case SSL_SERVER_FINISHED:
+ ret = ssl_parse_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( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ if( ret != 0 )
+ break;
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= handshake client" ) );
+
+ return( ret );
+}
+
+#endif