| /* |
| * 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" |
| |
| #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" ) ); |
| |
| if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) |
| { |
| ssl->major_ver = ssl->min_major_ver; |
| ssl->minor_ver = ssl->min_minor_ver; |
| } |
| |
| 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->handshake->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_negotiate->length; |
| |
| if( ssl->renegotiation != SSL_INITIAL_HANDSHAKE || n < 16 || n > 32 || |
| ssl->handshake->resume == 0 ) |
| n = 0; |
| |
| *p++ = (unsigned char) n; |
| |
| for( i = 0; i < n; i++ ) |
| *p++ = ssl->session_negotiate->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++ ); |
| if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) n++; |
| *p++ = (unsigned char)( n >> 7 ); |
| *p++ = (unsigned char)( n << 1 ); |
| |
| /* |
| * Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV |
| */ |
| if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) |
| { |
| *p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO >> 8 ); |
| *p++ = (unsigned char)( SSL_EMPTY_RENEGOTIATION_INFO ); |
| n--; |
| } |
| |
| 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] ); |
| } |
| |
| #if defined(POLARSSL_ZLIB_SUPPORT) |
| SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) ); |
| SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d", |
| SSL_COMPRESS_DEFLATE, SSL_COMPRESS_NULL ) ); |
| |
| *p++ = 2; |
| *p++ = SSL_COMPRESS_DEFLATE; |
| *p++ = SSL_COMPRESS_NULL; |
| #else |
| SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) ); |
| SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", SSL_COMPRESS_NULL ) ); |
| |
| *p++ = 1; |
| *p++ = SSL_COMPRESS_NULL; |
| #endif |
| |
| if ( ssl->hostname != NULL ) |
| { |
| SSL_DEBUG_MSG( 3, ( "client hello, prepping for server name extension: %s", |
| ssl->hostname ) ); |
| |
| ext_len += ssl->hostname_len + 9; |
| } |
| |
| if( ssl->renegotiation == SSL_RENEGOTIATION ) |
| { |
| SSL_DEBUG_MSG( 3, ( "client hello, prepping for renegotiation extension" ) ); |
| ext_len += 5 + ssl->verify_data_len; |
| } |
| |
| /* |
| * 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->renegotiation == SSL_RENEGOTIATION ) |
| { |
| /* |
| * Secure renegotiation |
| */ |
| SSL_DEBUG_MSG( 3, ( "client hello, renegotiation info extension" ) ); |
| |
| *p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF ); |
| *p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO ) & 0xFF ); |
| |
| *p++ = 0x00; |
| *p++ = ( ssl->verify_data_len + 1 ) & 0xFF; |
| *p++ = ssl->verify_data_len & 0xFF; |
| |
| memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); |
| p += ssl->verify_data_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_renegotiation_info( ssl_context *ssl, |
| unsigned char *buf, |
| size_t len ) |
| { |
| int ret; |
| |
| if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) |
| { |
| if( len != 1 || buf[0] != 0x0 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "non-zero length renegotiated connection field" ) ); |
| |
| if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| return( ret ); |
| |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| |
| ssl->secure_renegotiation = SSL_SECURE_RENEGOTIATION; |
| } |
| else |
| { |
| if( len != 1 + ssl->verify_data_len * 2 || |
| buf[0] != ssl->verify_data_len * 2 || |
| memcmp( buf + 1, ssl->own_verify_data, ssl->verify_data_len ) != 0 || |
| memcmp( buf + 1 + ssl->verify_data_len, |
| ssl->peer_verify_data, ssl->verify_data_len ) != 0 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "non-matching renegotiated connection field" ) ); |
| |
| if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| return( ret ); |
| |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| } |
| |
| return( 0 ); |
| } |
| |
| static int ssl_parse_server_hello( ssl_context *ssl ) |
| { |
| #if defined(POLARSSL_DEBUG_C) |
| time_t t; |
| #endif |
| int ret, i, comp; |
| size_t n; |
| size_t ext_len = 0; |
| unsigned char *buf, *ext; |
| int renegotiation_info_seen = 0; |
| int handshake_failure = 0; |
| |
| 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( ssl->minor_ver < ssl->min_minor_ver ) |
| { |
| SSL_DEBUG_MSG( 1, ( "server only supports ssl smaller than minimum" |
| " [%d:%d] < [%d:%d]", ssl->major_ver, ssl->minor_ver, |
| buf[4], buf[5] ) ); |
| |
| ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL, |
| SSL_ALERT_MSG_PROTOCOL_VERSION ); |
| |
| return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); |
| } |
| |
| #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->handshake->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 ); |
| |
| if( n > 32 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| |
| /* |
| * 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( ssl->in_hslen > 42 + n ) |
| { |
| ext_len = ( ( buf[42 + n] << 8 ) |
| | ( buf[43 + n] ) ); |
| |
| if( ( ext_len > 0 && ext_len < 4 ) || |
| ssl->in_hslen != 44 + 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]; |
| comp = buf[41 + n]; |
| |
| /* |
| * Initialize update checksum functions |
| */ |
| ssl_optimize_checksum( ssl, i ); |
| |
| 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->renegotiation != SSL_INITIAL_HANDSHAKE || |
| ssl->handshake->resume == 0 || n == 0 || |
| ssl->session_negotiate->ciphersuite != i || |
| ssl->session_negotiate->compression != comp || |
| ssl->session_negotiate->length != n || |
| memcmp( ssl->session_negotiate->id, buf + 39, n ) != 0 ) |
| { |
| ssl->state++; |
| ssl->handshake->resume = 0; |
| ssl->session_negotiate->start = time( NULL ); |
| ssl->session_negotiate->ciphersuite = i; |
| ssl->session_negotiate->compression = comp; |
| ssl->session_negotiate->length = n; |
| memcpy( ssl->session_negotiate->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->handshake->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_negotiate->ciphersuite ) |
| break; |
| } |
| |
| if( comp != SSL_COMPRESS_NULL |
| #if defined(POLARSSL_ZLIB_SUPPORT) |
| && comp != SSL_COMPRESS_DEFLATE |
| #endif |
| ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| ssl->session_negotiate->compression = comp; |
| |
| ext = buf + 44 + n; |
| |
| while( ext_len ) |
| { |
| unsigned int ext_id = ( ( ext[0] << 8 ) |
| | ( ext[1] ) ); |
| unsigned int ext_size = ( ( ext[2] << 8 ) |
| | ( ext[3] ) ); |
| |
| if( ext_size + 4 > ext_len ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| |
| switch( ext_id ) |
| { |
| case TLS_EXT_RENEGOTIATION_INFO: |
| SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) ); |
| renegotiation_info_seen = 1; |
| |
| if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size ) ) != 0 ) |
| return( ret ); |
| |
| break; |
| |
| default: |
| SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)", |
| ext_id ) ); |
| } |
| |
| ext_len -= 4 + ext_size; |
| ext += 4 + ext_size; |
| |
| if( ext_len > 0 && ext_len < 4 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| } |
| |
| /* |
| * Renegotiation security checks |
| */ |
| if( ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && |
| ssl->allow_legacy_renegotiation == SSL_LEGACY_BREAK_HANDSHAKE ) |
| { |
| SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); |
| handshake_failure = 1; |
| } |
| else if( ssl->renegotiation == SSL_RENEGOTIATION && |
| ssl->secure_renegotiation == SSL_SECURE_RENEGOTIATION && |
| renegotiation_info_seen == 0 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) ); |
| handshake_failure = 1; |
| } |
| else if( ssl->renegotiation == SSL_RENEGOTIATION && |
| ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && |
| ssl->allow_legacy_renegotiation == SSL_LEGACY_NO_RENEGOTIATION ) |
| { |
| SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) ); |
| handshake_failure = 1; |
| } |
| else if( ssl->renegotiation == SSL_RENEGOTIATION && |
| ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && |
| renegotiation_info_seen == 1 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) ); |
| handshake_failure = 1; |
| } |
| |
| if( handshake_failure == 1 ) |
| { |
| if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| return( ret ); |
| |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| |
| 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_negotiate->ciphersuite != TLS_DHE_RSA_WITH_DES_CBC_SHA && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_AES_128_CBC_SHA && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_AES_256_CBC_SHA && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256 && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 && |
| ssl->session_negotiate->ciphersuite != TLS_DHE_RSA_WITH_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->handshake->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->session_negotiate->peer_cert->rsa.len ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); |
| } |
| |
| if( ssl->handshake->dhm_ctx.len < 64 || ssl->handshake->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->handshake->dhm_ctx.P ); |
| SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G ); |
| SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->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->handshake->randbytes, 64 ); |
| md5_update( &md5, ssl->in_msg + 4, n ); |
| md5_finish( &md5, hash ); |
| |
| sha1_starts( &sha1 ); |
| sha1_update( &sha1, ssl->handshake->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; |
| #if defined(POLARSSL_SHA4_C) |
| sha4_context sha4; |
| #endif |
| |
| 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->handshake->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->handshake->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->handshake->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->handshake->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->handshake->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->handshake->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->session_negotiate->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; |
| unsigned char *buf, *p; |
| size_t n = 0, m = 0; |
| size_t cert_type_len = 0, sig_alg_len = 0, dn_len = 0; |
| |
| SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) ); |
| |
| /* |
| * 0 . 0 handshake type |
| * 1 . 3 handshake length |
| * 4 . 4 cert type count |
| * 5 .. m-1 cert types |
| * m .. m+1 sig alg length (TLS 1.2 only) |
| * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only) |
| * 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" ) ); |
| |
| if( ssl->client_auth == 0 ) |
| goto exit; |
| |
| // TODO: handshake_failure alert for an anonymous server to request |
| // client authentication |
| |
| buf = ssl->in_msg; |
| |
| // Retrieve cert types |
| // |
| cert_type_len = buf[4]; |
| n = cert_type_len; |
| |
| if( ssl->in_hslen < 6 + n ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); |
| } |
| |
| p = buf + 4; |
| while( cert_type_len > 0 ) |
| { |
| if( *p == SSL_CERT_TYPE_RSA_SIGN ) |
| { |
| ssl->handshake->cert_type = SSL_CERT_TYPE_RSA_SIGN; |
| break; |
| } |
| |
| cert_type_len--; |
| p++; |
| } |
| |
| if( ssl->handshake->cert_type == 0 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "no known cert_type provided" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); |
| } |
| |
| if( ssl->minor_ver == SSL_MINOR_VERSION_3 ) |
| { |
| sig_alg_len = ( ( buf[5 + n] << 8 ) |
| | ( buf[6 + n] ) ); |
| |
| p = buf + 7 + n; |
| m += 2; |
| n += sig_alg_len; |
| |
| if( ssl->in_hslen < 6 + n ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); |
| } |
| } |
| |
| dn_len = ( ( buf[5 + m + n] << 8 ) |
| | ( buf[6 + m + n] ) ); |
| |
| n += dn_len; |
| if( ssl->in_hslen != 7 + m + n ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); |
| } |
| |
| exit: |
| 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_negotiate->ciphersuite == TLS_DHE_RSA_WITH_DES_CBC_SHA || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_AES_128_CBC_SHA || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_AES_256_CBC_SHA || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256 || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256 || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_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->handshake->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->handshake->dhm_ctx, |
| mpi_size( &ssl->handshake->dhm_ctx.P ), |
| &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->handshake->dhm_ctx.X ); |
| SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX ); |
| |
| ssl->handshake->pmslen = ssl->handshake->dhm_ctx.len; |
| |
| if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx, |
| ssl->handshake->premaster, |
| &ssl->handshake->pmslen ) ) != 0 ) |
| { |
| SSL_DEBUG_RET( 1, "dhm_calc_secret", ret ); |
| return( ret ); |
| } |
| |
| SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); |
| #endif |
| } |
| else |
| { |
| /* |
| * RSA key exchange -- send rsa_public(pkcs1 v1.5(premaster)) |
| */ |
| ssl->handshake->premaster[0] = (unsigned char) ssl->max_major_ver; |
| ssl->handshake->premaster[1] = (unsigned char) ssl->max_minor_ver; |
| ssl->handshake->pmslen = 48; |
| |
| ret = ssl->f_rng( ssl->p_rng, ssl->handshake->premaster + 2, |
| ssl->handshake->pmslen - 2 ); |
| if( ret != 0 ) |
| return( ret ); |
| |
| i = 4; |
| n = ssl->session_negotiate->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->session_negotiate->peer_cert->rsa, |
| ssl->f_rng, ssl->p_rng, |
| RSA_PUBLIC, |
| ssl->handshake->pmslen, |
| ssl->handshake->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->rsa_key == NULL ) |
| { |
| SSL_DEBUG_MSG( 1, ( "got no private key" ) ); |
| return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED ); |
| } |
| |
| /* |
| * Make an RSA signature of the handshake digests |
| */ |
| ssl->handshake->calc_verify( ssl, hash ); |
| |
| if( ssl->minor_ver != SSL_MINOR_VERSION_3 ) |
| { |
| /* |
| * digitally-signed struct { |
| * opaque md5_hash[16]; |
| * opaque sha_hash[20]; |
| * }; |
| * |
| * md5_hash |
| * MD5(handshake_messages); |
| * |
| * sha_hash |
| * SHA(handshake_messages); |
| */ |
| hashlen = 36; |
| hash_id = SIG_RSA_RAW; |
| } |
| else |
| { |
| /* |
| * digitally-signed struct { |
| * opaque handshake_messages[handshake_messages_length]; |
| * }; |
| * |
| * Taking shortcut here. We assume that the server always allows the |
| * PRF Hash function and has sent it in the allowed signature |
| * algorithms list received in the Certificate Request message. |
| * |
| * Until we encounter a server that does not, we will take this |
| * shortcut. |
| * |
| * Reason: Otherwise we should have running hashes for SHA512 and SHA224 |
| * in order to satisfy 'weird' needs from the server side. |
| */ |
| if( ssl->session_negotiate->ciphersuite == TLS_RSA_WITH_AES_256_GCM_SHA384 || |
| ssl->session_negotiate->ciphersuite == TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 ) |
| { |
| hash_id = SIG_RSA_SHA384; |
| hashlen = 48; |
| ssl->out_msg[4] = SSL_HASH_SHA384; |
| ssl->out_msg[5] = SSL_SIG_RSA; |
| } |
| else |
| { |
| hash_id = SIG_RSA_SHA256; |
| hashlen = 32; |
| ssl->out_msg[4] = SSL_HASH_SHA256; |
| ssl->out_msg[5] = SSL_SIG_RSA; |
| } |
| |
| offset = 2; |
| } |
| |
| if ( ssl->rsa_key ) |
| n = ssl->rsa_key_len ( ssl->rsa_key ); |
| |
| ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 ); |
| ssl->out_msg[5 + offset] = (unsigned char)( n ); |
| |
| if( ssl->rsa_key ) |
| { |
| ret = ssl->rsa_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng, |
| RSA_PRIVATE, hash_id, |
| hashlen, hash, ssl->out_msg + 6 + offset ); |
| } |
| |
| 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 -- single step |
| */ |
| int ssl_handshake_client_step( ssl_context *ssl ) |
| { |
| int ret = 0; |
| |
| if( ssl->state == SSL_HANDSHAKE_OVER ) |
| return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); |
| |
| SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) ); |
| |
| if( ( ret = ssl_flush_output( ssl ) ) != 0 ) |
| return( ret ); |
| |
| 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_WRAPUP; |
| break; |
| |
| case SSL_HANDSHAKE_WRAPUP: |
| ssl_handshake_wrapup( ssl ); |
| break; |
| |
| default: |
| SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); |
| return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); |
| } |
| |
| return( ret ); |
| } |
| #endif |