| /* |
| * SSLv3/TLSv1 client-side functions |
| * |
| * Copyright (C) 2006-2010, 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 <string.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <time.h> |
| |
| static int ssl_write_client_hello( ssl_context *ssl ) |
| { |
| int ret, i, n; |
| unsigned char *buf; |
| unsigned char *p; |
| time_t t; |
| |
| SSL_DEBUG_MSG( 2, ( "=> write client hello" ) ); |
| |
| ssl->major_ver = SSL_MAJOR_VERSION_3; |
| ssl->minor_ver = SSL_MINOR_VERSION_0; |
| |
| ssl->max_major_ver = SSL_MAJOR_VERSION_3; |
| ssl->max_minor_ver = SSL_MINOR_VERSION_1; |
| |
| /* |
| * 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 ) ); |
| |
| for( i = 28; i > 0; i-- ) |
| *p++ = (unsigned char) ssl->f_rng( ssl->p_rng ); |
| |
| 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 cipherlist length |
| * 42+n . .. cipherlist |
| * .. . .. compression alg. (0) |
| * .. . .. extensions (unused) |
| */ |
| 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->ciphers[n] != 0; n++ ); |
| *p++ = (unsigned char)( n >> 7 ); |
| *p++ = (unsigned char)( n << 1 ); |
| |
| SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphers", n ) ); |
| |
| for( i = 0; i < n; i++ ) |
| { |
| SSL_DEBUG_MSG( 3, ( "client hello, add cipher: %2d", |
| ssl->ciphers[i] ) ); |
| |
| *p++ = (unsigned char)( ssl->ciphers[i] >> 8 ); |
| *p++ = (unsigned char)( ssl->ciphers[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, server name extension: %s", |
| ssl->hostname ) ); |
| |
| *p++ = (unsigned char)( ( (ssl->hostname_len + 9) >> 8 ) & 0xFF ); |
| *p++ = (unsigned char)( ( (ssl->hostname_len + 9) ) & 0xFF ); |
| |
| *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; |
| } |
| |
| 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 ) |
| { |
| time_t t; |
| int ret, i, 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_MINOR_VERSION_0 && |
| buf[5] != SSL_MINOR_VERSION_1 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| |
| ssl->minor_ver = buf[5]; |
| |
| t = ( (time_t) buf[6] << 24 ) |
| | ( (time_t) buf[7] << 16 ) |
| | ( (time_t) buf[8] << 8 ) |
| | ( (time_t) buf[9] ); |
| |
| 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 cipher |
| * 41+n . 41+n chosen compression alg. |
| * 42+n . 43+n extensions length |
| * 44+n . 44+n+m extensions |
| */ |
| if( n < 0 || n > 32 || ssl->in_hslen > 42 + n ) |
| { |
| ext_len = ( ( buf[42 + n] << 8 ) |
| | ( buf[43 + n] ) ) + 2; |
| } |
| else |
| { |
| ext_len = 0; |
| } |
| |
| if( n < 0 || 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]; |
| |
| 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->cipher != 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->cipher = 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 cipher: %d", i ) ); |
| SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[41 + n] ) ); |
| |
| i = 0; |
| while( 1 ) |
| { |
| if( ssl->ciphers[i] == 0 ) |
| { |
| SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); |
| } |
| |
| if( ssl->ciphers[i++] == ssl->session->cipher ) |
| 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 ) |
| { |
| int ret, n; |
| unsigned char *p, *end; |
| unsigned char hash[36]; |
| md5_context md5; |
| sha1_context sha1; |
| |
| SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) ); |
| |
| if( ssl->session->cipher != SSL_EDH_RSA_DES_168_SHA && |
| ssl->session->cipher != SSL_EDH_RSA_AES_128_SHA && |
| ssl->session->cipher != SSL_EDH_RSA_AES_256_SHA && |
| ssl->session->cipher != SSL_EDH_RSA_CAMELLIA_128_SHA && |
| ssl->session->cipher != SSL_EDH_RSA_CAMELLIA_256_SHA) |
| { |
| 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 ); |
| } |
| |
| /* |
| * 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( 1, ( "bad server key exchange message" ) ); |
| return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); |
| } |
| |
| if( (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 > 256 ) |
| { |
| 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 ); |
| |
| /* |
| * 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 ); |
| |
| SSL_DEBUG_BUF( 3, "parameters hash", hash, 36 ); |
| |
| if( ( ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC, |
| SIG_RSA_RAW, 36, 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, i, n; |
| |
| SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) ); |
| |
| if( ssl->session->cipher == SSL_EDH_RSA_DES_168_SHA || |
| ssl->session->cipher == SSL_EDH_RSA_AES_128_SHA || |
| ssl->session->cipher == SSL_EDH_RSA_AES_256_SHA || |
| ssl->session->cipher == SSL_EDH_RSA_CAMELLIA_128_SHA || |
| ssl->session->cipher == SSL_EDH_RSA_CAMELLIA_256_SHA) |
| { |
| #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; |
| |
| for( i = 2; i < ssl->pmslen; i++ ) |
| ssl->premaster[i] = (unsigned char) ssl->f_rng( ssl->p_rng ); |
| |
| 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, 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, n; |
| unsigned char hash[36]; |
| |
| SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) ); |
| |
| if( ssl->client_auth == 0 ) |
| { |
| 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_calc_verify( ssl, hash ); |
| |
| n = ssl->rsa_key->len; |
| ssl->out_msg[4] = (unsigned char)( n >> 8 ); |
| ssl->out_msg[5] = (unsigned char)( n ); |
| |
| if( ( ret = rsa_pkcs1_sign( ssl->rsa_key, RSA_PRIVATE, SIG_RSA_RAW, |
| 36, hash, ssl->out_msg + 6 ) ) != 0 ) |
| { |
| SSL_DEBUG_RET( 1, "rsa_pkcs1_sign", ret ); |
| return( ret ); |
| } |
| |
| ssl->out_msglen = 6 + n; |
| 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 |