diff options
Diffstat (limited to 'polarssl/src/library/ssl_tls.c')
| -rw-r--r-- | polarssl/src/library/ssl_tls.c | 3166 |
1 files changed, 0 insertions, 3166 deletions
diff --git a/polarssl/src/library/ssl_tls.c b/polarssl/src/library/ssl_tls.c deleted file mode 100644 index 88c6e55..0000000 --- a/polarssl/src/library/ssl_tls.c +++ /dev/null @@ -1,3166 +0,0 @@ -/* - * SSLv3/TLSv1 shared 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. - */ -/* - * The SSL 3.0 specification was drafted by Netscape in 1996, - * and became an IETF standard in 1999. - * - * http://wp.netscape.com/eng/ssl3/ - * http://www.ietf.org/rfc/rfc2246.txt - * http://www.ietf.org/rfc/rfc4346.txt - */ - -#include "polarssl/config.h" - -#if defined(POLARSSL_SSL_TLS_C) - -#include "polarssl/aes.h" -#include "polarssl/arc4.h" -#include "polarssl/camellia.h" -#include "polarssl/des.h" -#include "polarssl/debug.h" -#include "polarssl/ssl.h" -#include "polarssl/sha2.h" - -#if defined(POLARSSL_GCM_C) -#include "polarssl/gcm.h" -#endif - -#include <stdlib.h> -#include <time.h> - -#if defined _MSC_VER && !defined strcasecmp -#define strcasecmp _stricmp -#endif - -/* - * Key material generation - */ -static int tls1_prf( unsigned char *secret, size_t slen, char *label, - unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - size_t nb, hs; - size_t i, j, k; - unsigned char *S1, *S2; - unsigned char tmp[128]; - unsigned char h_i[20]; - - if( sizeof( tmp ) < 20 + strlen( label ) + rlen ) - return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); - - hs = ( slen + 1 ) / 2; - S1 = secret; - S2 = secret + slen - hs; - - nb = strlen( label ); - memcpy( tmp + 20, label, nb ); - memcpy( tmp + 20 + nb, random, rlen ); - nb += rlen; - - /* - * First compute P_md5(secret,label+random)[0..dlen] - */ - md5_hmac( S1, hs, tmp + 20, nb, 4 + tmp ); - - for( i = 0; i < dlen; i += 16 ) - { - md5_hmac( S1, hs, 4 + tmp, 16 + nb, h_i ); - md5_hmac( S1, hs, 4 + tmp, 16, 4 + tmp ); - - k = ( i + 16 > dlen ) ? dlen % 16 : 16; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = h_i[j]; - } - - /* - * XOR out with P_sha1(secret,label+random)[0..dlen] - */ - sha1_hmac( S2, hs, tmp + 20, nb, tmp ); - - for( i = 0; i < dlen; i += 20 ) - { - sha1_hmac( S2, hs, tmp, 20 + nb, h_i ); - sha1_hmac( S2, hs, tmp, 20, tmp ); - - k = ( i + 20 > dlen ) ? dlen % 20 : 20; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] ); - } - - memset( tmp, 0, sizeof( tmp ) ); - memset( h_i, 0, sizeof( h_i ) ); - - return( 0 ); -} - -static int tls_prf_sha256( unsigned char *secret, size_t slen, char *label, - unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - size_t nb; - size_t i, j, k; - unsigned char tmp[128]; - unsigned char h_i[32]; - - if( sizeof( tmp ) < 32 + strlen( label ) + rlen ) - return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); - - nb = strlen( label ); - memcpy( tmp + 32, label, nb ); - memcpy( tmp + 32 + nb, random, rlen ); - nb += rlen; - - /* - * Compute P_<hash>(secret, label + random)[0..dlen] - */ - sha2_hmac( secret, slen, tmp + 32, nb, tmp, 0 ); - - for( i = 0; i < dlen; i += 32 ) - { - sha2_hmac( secret, slen, tmp, 32 + nb, h_i, 0 ); - sha2_hmac( secret, slen, tmp, 32, tmp, 0 ); - - k = ( i + 32 > dlen ) ? dlen % 32 : 32; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = h_i[j]; - } - - memset( tmp, 0, sizeof( tmp ) ); - memset( h_i, 0, sizeof( h_i ) ); - - return( 0 ); -} - -static int tls_prf_sha384( unsigned char *secret, size_t slen, char *label, - unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - size_t nb; - size_t i, j, k; - unsigned char tmp[128]; - unsigned char h_i[48]; - - if( sizeof( tmp ) < 48 + strlen( label ) + rlen ) - return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); - - nb = strlen( label ); - memcpy( tmp + 48, label, nb ); - memcpy( tmp + 48 + nb, random, rlen ); - nb += rlen; - - /* - * Compute P_<hash>(secret, label + random)[0..dlen] - */ - sha4_hmac( secret, slen, tmp + 48, nb, tmp, 1 ); - - for( i = 0; i < dlen; i += 48 ) - { - sha4_hmac( secret, slen, tmp, 48 + nb, h_i, 1 ); - sha4_hmac( secret, slen, tmp, 48, tmp, 1 ); - - k = ( i + 48 > dlen ) ? dlen % 48 : 48; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = h_i[j]; - } - - memset( tmp, 0, sizeof( tmp ) ); - memset( h_i, 0, sizeof( h_i ) ); - - return( 0 ); -} - -static void ssl_update_checksum_start(ssl_context *, unsigned char *, size_t); -static void ssl_update_checksum_md5sha1(ssl_context *, unsigned char *, size_t); -static void ssl_update_checksum_sha256(ssl_context *, unsigned char *, size_t); -static void ssl_update_checksum_sha384(ssl_context *, unsigned char *, size_t); - -static void ssl_calc_verify_ssl(ssl_context *,unsigned char *); -static void ssl_calc_verify_tls(ssl_context *,unsigned char *); -static void ssl_calc_verify_tls_sha256(ssl_context *,unsigned char *); -static void ssl_calc_verify_tls_sha384(ssl_context *,unsigned char *); - -static void ssl_calc_finished_ssl(ssl_context *,unsigned char *,int); -static void ssl_calc_finished_tls(ssl_context *,unsigned char *,int); -static void ssl_calc_finished_tls_sha256(ssl_context *,unsigned char *,int); -static void ssl_calc_finished_tls_sha384(ssl_context *,unsigned char *,int); - -int ssl_derive_keys( ssl_context *ssl ) -{ - int i; - md5_context md5; - sha1_context sha1; - unsigned char tmp[64]; - unsigned char padding[16]; - unsigned char sha1sum[20]; - unsigned char keyblk[256]; - unsigned char *key1; - unsigned char *key2; - unsigned int iv_copy_len; - - SSL_DEBUG_MSG( 2, ( "=> derive keys" ) ); - - /* - * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions - */ - if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - ssl->tls_prf = tls1_prf; - ssl->calc_verify = ssl_calc_verify_ssl; - ssl->calc_finished = ssl_calc_finished_ssl; - } - else if( ssl->minor_ver < SSL_MINOR_VERSION_3 ) - { - ssl->tls_prf = tls1_prf; - ssl->calc_verify = ssl_calc_verify_tls; - ssl->calc_finished = ssl_calc_finished_tls; - } - else if( ssl->session->ciphersuite == SSL_RSA_AES_256_GCM_SHA384 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 ) - { - ssl->tls_prf = tls_prf_sha384; - ssl->calc_verify = ssl_calc_verify_tls_sha384; - ssl->calc_finished = ssl_calc_finished_tls_sha384; - } - else - { - ssl->tls_prf = tls_prf_sha256; - ssl->calc_verify = ssl_calc_verify_tls_sha256; - ssl->calc_finished = ssl_calc_finished_tls_sha256; - } - - /* - * SSLv3: - * master = - * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) + - * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) + - * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) ) - * - * TLSv1: - * master = PRF( premaster, "master secret", randbytes )[0..47] - */ - if( ssl->resume == 0 ) - { - size_t len = ssl->pmslen; - - SSL_DEBUG_BUF( 3, "premaster secret", ssl->premaster, len ); - - if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - for( i = 0; i < 3; i++ ) - { - memset( padding, 'A' + i, 1 + i ); - - sha1_starts( &sha1 ); - sha1_update( &sha1, padding, 1 + i ); - sha1_update( &sha1, ssl->premaster, len ); - sha1_update( &sha1, ssl->randbytes, 64 ); - sha1_finish( &sha1, sha1sum ); - - md5_starts( &md5 ); - md5_update( &md5, ssl->premaster, len ); - md5_update( &md5, sha1sum, 20 ); - md5_finish( &md5, ssl->session->master + i * 16 ); - } - } - else - ssl->tls_prf( ssl->premaster, len, "master secret", - ssl->randbytes, 64, ssl->session->master, 48 ); - - memset( ssl->premaster, 0, sizeof( ssl->premaster ) ); - } - else - SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) ); - - /* - * Swap the client and server random values. - */ - memcpy( tmp, ssl->randbytes, 64 ); - memcpy( ssl->randbytes, tmp + 32, 32 ); - memcpy( ssl->randbytes + 32, tmp, 32 ); - memset( tmp, 0, sizeof( tmp ) ); - - /* - * SSLv3: - * key block = - * MD5( master + SHA1( 'A' + master + randbytes ) ) + - * MD5( master + SHA1( 'BB' + master + randbytes ) ) + - * MD5( master + SHA1( 'CCC' + master + randbytes ) ) + - * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) + - * ... - * - * TLSv1: - * key block = PRF( master, "key expansion", randbytes ) - */ - if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - for( i = 0; i < 16; i++ ) - { - memset( padding, 'A' + i, 1 + i ); - - sha1_starts( &sha1 ); - sha1_update( &sha1, padding, 1 + i ); - sha1_update( &sha1, ssl->session->master, 48 ); - sha1_update( &sha1, ssl->randbytes, 64 ); - sha1_finish( &sha1, sha1sum ); - - md5_starts( &md5 ); - md5_update( &md5, ssl->session->master, 48 ); - md5_update( &md5, sha1sum, 20 ); - md5_finish( &md5, keyblk + i * 16 ); - } - - memset( &md5, 0, sizeof( md5 ) ); - memset( &sha1, 0, sizeof( sha1 ) ); - - memset( padding, 0, sizeof( padding ) ); - memset( sha1sum, 0, sizeof( sha1sum ) ); - } - else - ssl->tls_prf( ssl->session->master, 48, "key expansion", - ssl->randbytes, 64, keyblk, 256 ); - - SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", ssl_get_ciphersuite( ssl ) ) ); - SSL_DEBUG_BUF( 3, "master secret", ssl->session->master, 48 ); - SSL_DEBUG_BUF( 4, "random bytes", ssl->randbytes, 64 ); - SSL_DEBUG_BUF( 4, "key block", keyblk, 256 ); - - memset( ssl->randbytes, 0, sizeof( ssl->randbytes ) ); - - /* - * Determine the appropriate key, IV and MAC length. - */ - switch( ssl->session->ciphersuite ) - { -#if defined(POLARSSL_ARC4_C) - case SSL_RSA_RC4_128_MD5: - ssl->keylen = 16; ssl->minlen = 16; - ssl->ivlen = 0; ssl->maclen = 16; - break; - - case SSL_RSA_RC4_128_SHA: - ssl->keylen = 16; ssl->minlen = 20; - ssl->ivlen = 0; ssl->maclen = 20; - break; -#endif - -#if defined(POLARSSL_DES_C) - case SSL_RSA_DES_168_SHA: - case SSL_EDH_RSA_DES_168_SHA: - ssl->keylen = 24; ssl->minlen = 24; - ssl->ivlen = 8; ssl->maclen = 20; - break; -#endif - -#if defined(POLARSSL_AES_C) - case SSL_RSA_AES_128_SHA: - case SSL_EDH_RSA_AES_128_SHA: - ssl->keylen = 16; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 20; - break; - - case SSL_RSA_AES_256_SHA: - case SSL_EDH_RSA_AES_256_SHA: - ssl->keylen = 32; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 20; - break; - -#if defined(POLARSSL_SHA2_C) - case SSL_RSA_AES_128_SHA256: - case SSL_EDH_RSA_AES_128_SHA256: - ssl->keylen = 16; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 32; - break; - - case SSL_RSA_AES_256_SHA256: - case SSL_EDH_RSA_AES_256_SHA256: - ssl->keylen = 32; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 32; - break; -#endif -#if defined(POLARSSL_GCM_C) - case SSL_RSA_AES_128_GCM_SHA256: - case SSL_EDH_RSA_AES_128_GCM_SHA256: - ssl->keylen = 16; ssl->minlen = 1; - ssl->ivlen = 12; ssl->maclen = 0; - ssl->fixed_ivlen = 4; - break; - - case SSL_RSA_AES_256_GCM_SHA384: - case SSL_EDH_RSA_AES_256_GCM_SHA384: - ssl->keylen = 32; ssl->minlen = 1; - ssl->ivlen = 12; ssl->maclen = 0; - ssl->fixed_ivlen = 4; - break; -#endif -#endif - -#if defined(POLARSSL_CAMELLIA_C) - case SSL_RSA_CAMELLIA_128_SHA: - case SSL_EDH_RSA_CAMELLIA_128_SHA: - ssl->keylen = 16; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 20; - break; - - case SSL_RSA_CAMELLIA_256_SHA: - case SSL_EDH_RSA_CAMELLIA_256_SHA: - ssl->keylen = 32; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 20; - break; - -#if defined(POLARSSL_SHA2_C) - case SSL_RSA_CAMELLIA_128_SHA256: - case SSL_EDH_RSA_CAMELLIA_128_SHA256: - ssl->keylen = 16; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 32; - break; - - case SSL_RSA_CAMELLIA_256_SHA256: - case SSL_EDH_RSA_CAMELLIA_256_SHA256: - ssl->keylen = 32; ssl->minlen = 32; - ssl->ivlen = 16; ssl->maclen = 32; - break; -#endif -#endif - -#if defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) -#if defined(POLARSSL_CIPHER_NULL_CIPHER) - case SSL_RSA_NULL_MD5: - ssl->keylen = 0; ssl->minlen = 0; - ssl->ivlen = 0; ssl->maclen = 16; - break; - - case SSL_RSA_NULL_SHA: - ssl->keylen = 0; ssl->minlen = 0; - ssl->ivlen = 0; ssl->maclen = 20; - break; - - case SSL_RSA_NULL_SHA256: - ssl->keylen = 0; ssl->minlen = 0; - ssl->ivlen = 0; ssl->maclen = 32; - break; -#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */ - -#if defined(POLARSSL_DES_C) - case SSL_RSA_DES_SHA: - case SSL_EDH_RSA_DES_SHA: - ssl->keylen = 8; ssl->minlen = 8; - ssl->ivlen = 8; ssl->maclen = 20; - break; -#endif -#endif /* defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) */ - - default: - SSL_DEBUG_MSG( 1, ( "ciphersuite %s is not available", - ssl_get_ciphersuite( ssl ) ) ); - return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d", - ssl->keylen, ssl->minlen, ssl->ivlen, ssl->maclen ) ); - - /* - * Finally setup the cipher contexts, IVs and MAC secrets. - */ - if( ssl->endpoint == SSL_IS_CLIENT ) - { - key1 = keyblk + ssl->maclen * 2; - key2 = keyblk + ssl->maclen * 2 + ssl->keylen; - - memcpy( ssl->mac_enc, keyblk, ssl->maclen ); - memcpy( ssl->mac_dec, keyblk + ssl->maclen, ssl->maclen ); - - /* - * This is not used in TLS v1.1. - */ - iv_copy_len = ( ssl->fixed_ivlen ) ? ssl->fixed_ivlen : ssl->ivlen; - memcpy( ssl->iv_enc, key2 + ssl->keylen, iv_copy_len ); - memcpy( ssl->iv_dec, key2 + ssl->keylen + iv_copy_len, - iv_copy_len ); - } - else - { - key1 = keyblk + ssl->maclen * 2 + ssl->keylen; - key2 = keyblk + ssl->maclen * 2; - - memcpy( ssl->mac_dec, keyblk, ssl->maclen ); - memcpy( ssl->mac_enc, keyblk + ssl->maclen, ssl->maclen ); - - /* - * This is not used in TLS v1.1. - */ - iv_copy_len = ( ssl->fixed_ivlen ) ? ssl->fixed_ivlen : ssl->ivlen; - memcpy( ssl->iv_dec, key1 + ssl->keylen, iv_copy_len ); - memcpy( ssl->iv_enc, key1 + ssl->keylen + iv_copy_len, - iv_copy_len ); - } - - switch( ssl->session->ciphersuite ) - { -#if defined(POLARSSL_ARC4_C) - case SSL_RSA_RC4_128_MD5: - case SSL_RSA_RC4_128_SHA: - arc4_setup( (arc4_context *) ssl->ctx_enc, key1, ssl->keylen ); - arc4_setup( (arc4_context *) ssl->ctx_dec, key2, ssl->keylen ); - break; -#endif - -#if defined(POLARSSL_DES_C) - case SSL_RSA_DES_168_SHA: - case SSL_EDH_RSA_DES_168_SHA: - des3_set3key_enc( (des3_context *) ssl->ctx_enc, key1 ); - des3_set3key_dec( (des3_context *) ssl->ctx_dec, key2 ); - break; -#endif - -#if defined(POLARSSL_AES_C) - case SSL_RSA_AES_128_SHA: - case SSL_EDH_RSA_AES_128_SHA: - case SSL_RSA_AES_128_SHA256: - case SSL_EDH_RSA_AES_128_SHA256: - aes_setkey_enc( (aes_context *) ssl->ctx_enc, key1, 128 ); - aes_setkey_dec( (aes_context *) ssl->ctx_dec, key2, 128 ); - break; - - case SSL_RSA_AES_256_SHA: - case SSL_EDH_RSA_AES_256_SHA: - case SSL_RSA_AES_256_SHA256: - case SSL_EDH_RSA_AES_256_SHA256: - aes_setkey_enc( (aes_context *) ssl->ctx_enc, key1, 256 ); - aes_setkey_dec( (aes_context *) ssl->ctx_dec, key2, 256 ); - break; - -#if defined(POLARSSL_GCM_C) - case SSL_RSA_AES_128_GCM_SHA256: - case SSL_EDH_RSA_AES_128_GCM_SHA256: - gcm_init( (gcm_context *) ssl->ctx_enc, key1, 128 ); - gcm_init( (gcm_context *) ssl->ctx_dec, key2, 128 ); - break; - - case SSL_RSA_AES_256_GCM_SHA384: - case SSL_EDH_RSA_AES_256_GCM_SHA384: - gcm_init( (gcm_context *) ssl->ctx_enc, key1, 256 ); - gcm_init( (gcm_context *) ssl->ctx_dec, key2, 256 ); - break; -#endif -#endif - -#if defined(POLARSSL_CAMELLIA_C) - case SSL_RSA_CAMELLIA_128_SHA: - case SSL_EDH_RSA_CAMELLIA_128_SHA: - case SSL_RSA_CAMELLIA_128_SHA256: - case SSL_EDH_RSA_CAMELLIA_128_SHA256: - camellia_setkey_enc( (camellia_context *) ssl->ctx_enc, key1, 128 ); - camellia_setkey_dec( (camellia_context *) ssl->ctx_dec, key2, 128 ); - break; - - case SSL_RSA_CAMELLIA_256_SHA: - case SSL_EDH_RSA_CAMELLIA_256_SHA: - case SSL_RSA_CAMELLIA_256_SHA256: - case SSL_EDH_RSA_CAMELLIA_256_SHA256: - camellia_setkey_enc( (camellia_context *) ssl->ctx_enc, key1, 256 ); - camellia_setkey_dec( (camellia_context *) ssl->ctx_dec, key2, 256 ); - break; -#endif - -#if defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) -#if defined(POLARSSL_CIPHER_NULL_CIPHER) - case SSL_RSA_NULL_MD5: - case SSL_RSA_NULL_SHA: - case SSL_RSA_NULL_SHA256: - break; -#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */ - -#if defined(POLARSSL_DES_C) - case SSL_RSA_DES_SHA: - case SSL_EDH_RSA_DES_SHA: - des_setkey_enc( (des_context *) ssl->ctx_enc, key1 ); - des_setkey_dec( (des_context *) ssl->ctx_dec, key2 ); - break; -#endif -#endif /* defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) */ - - default: - return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - memset( keyblk, 0, sizeof( keyblk ) ); - - SSL_DEBUG_MSG( 2, ( "<= derive keys" ) ); - - return( 0 ); -} - -void ssl_calc_verify_ssl( ssl_context *ssl, unsigned char hash[36] ) -{ - md5_context md5; - sha1_context sha1; - unsigned char pad_1[48]; - unsigned char pad_2[48]; - - SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) ); - - memcpy( &md5 , (md5_context *) ssl->ctx_checksum, sizeof(md5_context) ); - memcpy( &sha1, (sha1_context *) ( ssl->ctx_checksum + sizeof(md5_context) ), - sizeof( sha1_context ) ); - - memset( pad_1, 0x36, 48 ); - memset( pad_2, 0x5C, 48 ); - - md5_update( &md5, ssl->session->master, 48 ); - md5_update( &md5, pad_1, 48 ); - md5_finish( &md5, hash ); - - md5_starts( &md5 ); - md5_update( &md5, ssl->session->master, 48 ); - md5_update( &md5, pad_2, 48 ); - md5_update( &md5, hash, 16 ); - md5_finish( &md5, hash ); - - sha1_update( &sha1, ssl->session->master, 48 ); - sha1_update( &sha1, pad_1, 40 ); - sha1_finish( &sha1, hash + 16 ); - - sha1_starts( &sha1 ); - sha1_update( &sha1, ssl->session->master, 48 ); - sha1_update( &sha1, pad_2, 40 ); - sha1_update( &sha1, hash + 16, 20 ); - sha1_finish( &sha1, hash + 16 ); - - SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); - SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - return; -} - -void ssl_calc_verify_tls( ssl_context *ssl, unsigned char hash[36] ) -{ - md5_context md5; - sha1_context sha1; - - SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) ); - - memcpy( &md5 , (md5_context *) ssl->ctx_checksum, sizeof(md5_context) ); - memcpy( &sha1, (sha1_context *) ( ssl->ctx_checksum + sizeof(md5_context) ), - sizeof( sha1_context ) ); - - md5_finish( &md5, hash ); - sha1_finish( &sha1, hash + 16 ); - - SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); - SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - return; -} - -void ssl_calc_verify_tls_sha256( ssl_context *ssl, unsigned char hash[32] ) -{ - sha2_context sha2; - - SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) ); - - memcpy( &sha2 , (sha2_context *) ssl->ctx_checksum, sizeof(sha2_context) ); - sha2_finish( &sha2, hash ); - - SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 ); - SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - return; -} - -void ssl_calc_verify_tls_sha384( ssl_context *ssl, unsigned char hash[48] ) -{ - sha4_context sha4; - - SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) ); - - memcpy( &sha4 , (sha4_context *) ssl->ctx_checksum, sizeof(sha4_context) ); - sha4_finish( &sha4, hash ); - - SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 ); - SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - return; -} - -/* - * SSLv3.0 MAC functions - */ -static void ssl_mac_md5( unsigned char *secret, - unsigned char *buf, size_t len, - unsigned char *ctr, int type ) -{ - unsigned char header[11]; - unsigned char padding[48]; - md5_context md5; - - memcpy( header, ctr, 8 ); - header[ 8] = (unsigned char) type; - header[ 9] = (unsigned char)( len >> 8 ); - header[10] = (unsigned char)( len ); - - memset( padding, 0x36, 48 ); - md5_starts( &md5 ); - md5_update( &md5, secret, 16 ); - md5_update( &md5, padding, 48 ); - md5_update( &md5, header, 11 ); - md5_update( &md5, buf, len ); - md5_finish( &md5, buf + len ); - - memset( padding, 0x5C, 48 ); - md5_starts( &md5 ); - md5_update( &md5, secret, 16 ); - md5_update( &md5, padding, 48 ); - md5_update( &md5, buf + len, 16 ); - md5_finish( &md5, buf + len ); -} - -static void ssl_mac_sha1( unsigned char *secret, - unsigned char *buf, size_t len, - unsigned char *ctr, int type ) -{ - unsigned char header[11]; - unsigned char padding[40]; - sha1_context sha1; - - memcpy( header, ctr, 8 ); - header[ 8] = (unsigned char) type; - header[ 9] = (unsigned char)( len >> 8 ); - header[10] = (unsigned char)( len ); - - memset( padding, 0x36, 40 ); - sha1_starts( &sha1 ); - sha1_update( &sha1, secret, 20 ); - sha1_update( &sha1, padding, 40 ); - sha1_update( &sha1, header, 11 ); - sha1_update( &sha1, buf, len ); - sha1_finish( &sha1, buf + len ); - - memset( padding, 0x5C, 40 ); - sha1_starts( &sha1 ); - sha1_update( &sha1, secret, 20 ); - sha1_update( &sha1, padding, 40 ); - sha1_update( &sha1, buf + len, 20 ); - sha1_finish( &sha1, buf + len ); -} - -/* - * Encryption/decryption functions - */ -static int ssl_encrypt_buf( ssl_context *ssl ) -{ - size_t i, padlen; - - SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) ); - - /* - * Add MAC then encrypt - */ - if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - if( ssl->maclen == 16 ) - ssl_mac_md5( ssl->mac_enc, - ssl->out_msg, ssl->out_msglen, - ssl->out_ctr, ssl->out_msgtype ); - - if( ssl->maclen == 20 ) - ssl_mac_sha1( ssl->mac_enc, - ssl->out_msg, ssl->out_msglen, - ssl->out_ctr, ssl->out_msgtype ); - } - else - { - if( ssl->maclen == 16 ) - md5_hmac( ssl->mac_enc, 16, - ssl->out_ctr, ssl->out_msglen + 13, - ssl->out_msg + ssl->out_msglen ); - - if( ssl->maclen == 20 ) - sha1_hmac( ssl->mac_enc, 20, - ssl->out_ctr, ssl->out_msglen + 13, - ssl->out_msg + ssl->out_msglen ); - - if( ssl->maclen == 32 ) - sha2_hmac( ssl->mac_enc, 32, - ssl->out_ctr, ssl->out_msglen + 13, - ssl->out_msg + ssl->out_msglen, 0); - } - - SSL_DEBUG_BUF( 4, "computed mac", - ssl->out_msg + ssl->out_msglen, ssl->maclen ); - - ssl->out_msglen += ssl->maclen; - - if( ssl->ivlen == 0 ) - { - padlen = 0; - - SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " - "including %d bytes of padding", - ssl->out_msglen, 0 ) ); - - SSL_DEBUG_BUF( 4, "before encrypt: output payload", - ssl->out_msg, ssl->out_msglen ); - -#if defined(POLARSSL_ARC4_C) - if( ssl->session->ciphersuite == SSL_RSA_RC4_128_MD5 || - ssl->session->ciphersuite == SSL_RSA_RC4_128_SHA ) - { - arc4_crypt( (arc4_context *) ssl->ctx_enc, - ssl->out_msglen, ssl->out_msg, - ssl->out_msg ); - } else -#endif -#if defined(POLARSSL_CIPHER_NULL_CIPHER) - if( ssl->session->ciphersuite == SSL_RSA_NULL_MD5 || - ssl->session->ciphersuite == SSL_RSA_NULL_SHA || - ssl->session->ciphersuite == SSL_RSA_NULL_SHA256 ) - { - } else -#endif - return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); - } - else if( ssl->ivlen == 12 ) - { - size_t enc_msglen; - unsigned char *enc_msg; - unsigned char add_data[13]; - int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; - - padlen = 0; - enc_msglen = ssl->out_msglen; - - memcpy( add_data, ssl->out_ctr, 8 ); - add_data[8] = ssl->out_msgtype; - add_data[9] = ssl->major_ver; - add_data[10] = ssl->minor_ver; - add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF; - add_data[12] = ssl->out_msglen & 0xFF; - - SSL_DEBUG_BUF( 4, "additional data used for AEAD", - add_data, 13 ); - -#if defined(POLARSSL_AES_C) && defined(POLARSSL_GCM_C) - - if( ssl->session->ciphersuite == SSL_RSA_AES_128_GCM_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_GCM_SHA256 || - ssl->session->ciphersuite == SSL_RSA_AES_256_GCM_SHA384 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 ) - { - /* - * Generate IV - */ - ret = ssl->f_rng( ssl->p_rng, ssl->iv_enc + ssl->fixed_ivlen, - ssl->ivlen - ssl->fixed_ivlen ); - if( ret != 0 ) - return( ret ); - - /* - * Shift message for ivlen bytes and prepend IV - */ - memmove( ssl->out_msg + ssl->ivlen - ssl->fixed_ivlen, - ssl->out_msg, ssl->out_msglen ); - memcpy( ssl->out_msg, ssl->iv_enc + ssl->fixed_ivlen, - ssl->ivlen - ssl->fixed_ivlen ); - - /* - * Fix pointer positions and message length with added IV - */ - enc_msg = ssl->out_msg + ssl->ivlen - ssl->fixed_ivlen; - enc_msglen = ssl->out_msglen; - ssl->out_msglen += ssl->ivlen - ssl->fixed_ivlen; - - SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " - "including %d bytes of padding", - ssl->out_msglen, 0 ) ); - - SSL_DEBUG_BUF( 4, "before encrypt: output payload", - ssl->out_msg, ssl->out_msglen ); - - /* - * Adjust for tag - */ - ssl->out_msglen += 16; - - gcm_crypt_and_tag( (gcm_context *) ssl->ctx_enc, - GCM_ENCRYPT, enc_msglen, - ssl->iv_enc, ssl->ivlen, - add_data, 13, - enc_msg, enc_msg, - 16, enc_msg + enc_msglen ); - - SSL_DEBUG_BUF( 4, "after encrypt: tag", - enc_msg + enc_msglen, 16 ); - - } else -#endif - return( ret ); - } - else - { - unsigned char *enc_msg; - size_t enc_msglen; - - padlen = ssl->ivlen - ( ssl->out_msglen + 1 ) % ssl->ivlen; - if( padlen == ssl->ivlen ) - padlen = 0; - - for( i = 0; i <= padlen; i++ ) - ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen; - - ssl->out_msglen += padlen + 1; - - enc_msglen = ssl->out_msglen; - enc_msg = ssl->out_msg; - - /* - * Prepend per-record IV for block cipher in TLS v1.1 and up as per - * Method 1 (6.2.3.2. in RFC4346 and RFC5246) - */ - if( ssl->minor_ver >= SSL_MINOR_VERSION_2 ) - { - /* - * Generate IV - */ - int ret = ssl->f_rng( ssl->p_rng, ssl->iv_enc, ssl->ivlen ); - if( ret != 0 ) - return( ret ); - - /* - * Shift message for ivlen bytes and prepend IV - */ - memmove( ssl->out_msg + ssl->ivlen, ssl->out_msg, ssl->out_msglen ); - memcpy( ssl->out_msg, ssl->iv_enc, ssl->ivlen ); - - /* - * Fix pointer positions and message length with added IV - */ - enc_msg = ssl->out_msg + ssl->ivlen; - enc_msglen = ssl->out_msglen; - ssl->out_msglen += ssl->ivlen; - } - - SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " - "including %d bytes of IV and %d bytes of padding", - ssl->out_msglen, ssl->ivlen, padlen + 1 ) ); - - SSL_DEBUG_BUF( 4, "before encrypt: output payload", - ssl->out_msg, ssl->out_msglen ); - - switch( ssl->ivlen ) - { -#if defined(POLARSSL_DES_C) - case 8: -#if defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) - if( ssl->session->ciphersuite == SSL_RSA_DES_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_DES_SHA ) - { - des_crypt_cbc( (des_context *) ssl->ctx_enc, - DES_ENCRYPT, enc_msglen, - ssl->iv_enc, enc_msg, enc_msg ); - } - else -#endif - des3_crypt_cbc( (des3_context *) ssl->ctx_enc, - DES_ENCRYPT, enc_msglen, - ssl->iv_enc, enc_msg, enc_msg ); - break; -#endif - - case 16: -#if defined(POLARSSL_AES_C) - if ( ssl->session->ciphersuite == SSL_RSA_AES_128_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA || - ssl->session->ciphersuite == SSL_RSA_AES_256_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA || - ssl->session->ciphersuite == SSL_RSA_AES_128_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA256 || - ssl->session->ciphersuite == SSL_RSA_AES_256_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA256 ) - { - aes_crypt_cbc( (aes_context *) ssl->ctx_enc, - AES_ENCRYPT, enc_msglen, - ssl->iv_enc, enc_msg, enc_msg); - break; - } -#endif - -#if defined(POLARSSL_CAMELLIA_C) - if ( ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA || - ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA || - ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA256 || - ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA256 ) - { - camellia_crypt_cbc( (camellia_context *) ssl->ctx_enc, - CAMELLIA_ENCRYPT, enc_msglen, - ssl->iv_enc, enc_msg, enc_msg ); - break; - } -#endif - - default: - return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); - } - } - - for( i = 8; i > 0; i-- ) - if( ++ssl->out_ctr[i - 1] != 0 ) - break; - - SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) ); - - return( 0 ); -} - -/* - * TODO: Use digest version when integrated! - */ -#define POLARSSL_SSL_MAX_MAC_SIZE 32 - -static int ssl_decrypt_buf( ssl_context *ssl ) -{ - size_t i, padlen; - unsigned char tmp[POLARSSL_SSL_MAX_MAC_SIZE]; - - SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) ); - - if( ssl->in_msglen < ssl->minlen ) - { - SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)", - ssl->in_msglen, ssl->minlen ) ); - return( POLARSSL_ERR_SSL_INVALID_MAC ); - } - - if( ssl->ivlen == 0 ) - { -#if defined(POLARSSL_ARC4_C) - padlen = 0; - if( ssl->session->ciphersuite == SSL_RSA_RC4_128_MD5 || - ssl->session->ciphersuite == SSL_RSA_RC4_128_SHA ) - { - arc4_crypt( (arc4_context *) ssl->ctx_dec, - ssl->in_msglen, ssl->in_msg, - ssl->in_msg ); - } else -#endif -#if defined(POLARSSL_CIPHER_NULL_CIPHER) - if( ssl->session->ciphersuite == SSL_RSA_NULL_MD5 || - ssl->session->ciphersuite == SSL_RSA_NULL_SHA || - ssl->session->ciphersuite == SSL_RSA_NULL_SHA256 ) - { - } else -#endif - return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); - } - else if( ssl->ivlen == 12 ) - { - unsigned char *dec_msg; - unsigned char *dec_msg_result; - size_t dec_msglen; - unsigned char add_data[13]; - int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; - - padlen = 0; - -#if defined(POLARSSL_AES_C) && defined(POLARSSL_GCM_C) - if( ssl->session->ciphersuite == SSL_RSA_AES_128_GCM_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_GCM_SHA256 || - ssl->session->ciphersuite == SSL_RSA_AES_256_GCM_SHA384 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 ) - { - dec_msglen = ssl->in_msglen - ( ssl->ivlen - ssl->fixed_ivlen ); - dec_msglen -= 16; - dec_msg = ssl->in_msg + ( ssl->ivlen - ssl->fixed_ivlen ); - dec_msg_result = ssl->in_msg; - ssl->in_msglen = dec_msglen; - - memcpy( add_data, ssl->in_ctr, 8 ); - add_data[8] = ssl->in_msgtype; - add_data[9] = ssl->major_ver; - add_data[10] = ssl->minor_ver; - add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF; - add_data[12] = ssl->in_msglen & 0xFF; - - SSL_DEBUG_BUF( 4, "additional data used for AEAD", - add_data, 13 ); - - memcpy( ssl->iv_dec + ssl->fixed_ivlen, ssl->in_msg, - ssl->ivlen - ssl->fixed_ivlen ); - - SSL_DEBUG_BUF( 4, "IV used", ssl->iv_dec, ssl->ivlen ); - SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, 16 ); - - memcpy( ssl->iv_dec + ssl->fixed_ivlen, ssl->in_msg, - ssl->ivlen - ssl->fixed_ivlen ); - - ret = gcm_auth_decrypt( (gcm_context *) ssl->ctx_dec, - dec_msglen, - ssl->iv_dec, ssl->ivlen, - add_data, 13, - dec_msg + dec_msglen, 16, - dec_msg, dec_msg_result ); - - if( ret != 0 ) - { - SSL_DEBUG_MSG( 1, ( "AEAD decrypt failed on validation (ret = -0x%02x)", - -ret ) ); - - return( POLARSSL_ERR_SSL_INVALID_MAC ); - } - } else -#endif - return( ret ); - } - else - { - unsigned char *dec_msg; - unsigned char *dec_msg_result; - size_t dec_msglen; - - /* - * Decrypt and check the padding - */ - if( ssl->in_msglen % ssl->ivlen != 0 ) - { - SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0", - ssl->in_msglen, ssl->ivlen ) ); - return( POLARSSL_ERR_SSL_INVALID_MAC ); - } - - dec_msglen = ssl->in_msglen; - dec_msg = ssl->in_msg; - dec_msg_result = ssl->in_msg; - - /* - * Initialize for prepended IV for block cipher in TLS v1.1 and up - */ - if( ssl->minor_ver >= SSL_MINOR_VERSION_2 ) - { - dec_msg += ssl->ivlen; - dec_msglen -= ssl->ivlen; - ssl->in_msglen -= ssl->ivlen; - - for( i = 0; i < ssl->ivlen; i++ ) - ssl->iv_dec[i] = ssl->in_msg[i]; - } - - switch( ssl->ivlen ) - { -#if defined(POLARSSL_DES_C) - case 8: -#if defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) - if( ssl->session->ciphersuite == SSL_RSA_DES_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_DES_SHA ) - { - des_crypt_cbc( (des_context *) ssl->ctx_dec, - DES_DECRYPT, dec_msglen, - ssl->iv_dec, dec_msg, dec_msg_result ); - } - else -#endif - des3_crypt_cbc( (des3_context *) ssl->ctx_dec, - DES_DECRYPT, dec_msglen, - ssl->iv_dec, dec_msg, dec_msg_result ); - break; -#endif - - case 16: -#if defined(POLARSSL_AES_C) - if ( ssl->session->ciphersuite == SSL_RSA_AES_128_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA || - ssl->session->ciphersuite == SSL_RSA_AES_256_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA || - ssl->session->ciphersuite == SSL_RSA_AES_128_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA256 || - ssl->session->ciphersuite == SSL_RSA_AES_256_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA256 ) - { - aes_crypt_cbc( (aes_context *) ssl->ctx_dec, - AES_DECRYPT, dec_msglen, - ssl->iv_dec, dec_msg, dec_msg_result ); - break; - } -#endif - -#if defined(POLARSSL_CAMELLIA_C) - if ( ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA || - ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA || - ssl->session->ciphersuite == SSL_RSA_CAMELLIA_128_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA256 || - ssl->session->ciphersuite == SSL_RSA_CAMELLIA_256_SHA256 || - ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA256 ) - { - camellia_crypt_cbc( (camellia_context *) ssl->ctx_dec, - CAMELLIA_DECRYPT, dec_msglen, - ssl->iv_dec, dec_msg, dec_msg_result ); - break; - } -#endif - - default: - return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - padlen = 1 + ssl->in_msg[ssl->in_msglen - 1]; - - if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - if( padlen > ssl->ivlen ) - { - SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, " - "should be no more than %d", - padlen, ssl->ivlen ) ); - padlen = 0; - } - } - else - { - /* - * TLSv1: always check the padding - */ - for( i = 1; i <= padlen; i++ ) - { - if( ssl->in_msg[ssl->in_msglen - i] != padlen - 1 ) - { - SSL_DEBUG_MSG( 1, ( "bad padding byte: should be " - "%02x, but is %02x", padlen - 1, - ssl->in_msg[ssl->in_msglen - i] ) ); - padlen = 0; - } - } - } - } - - SSL_DEBUG_BUF( 4, "raw buffer after decryption", - ssl->in_msg, ssl->in_msglen ); - - /* - * Always compute the MAC (RFC4346, CBCTIME). - */ - if( ssl->in_msglen < ssl->maclen + padlen ) - { - SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)", - ssl->in_msglen, ssl->maclen, padlen ) ); - return( POLARSSL_ERR_SSL_INVALID_MAC ); - } - - ssl->in_msglen -= ( ssl->maclen + padlen ); - - ssl->in_hdr[3] = (unsigned char)( ssl->in_msglen >> 8 ); - ssl->in_hdr[4] = (unsigned char)( ssl->in_msglen ); - - memcpy( tmp, ssl->in_msg + ssl->in_msglen, POLARSSL_SSL_MAX_MAC_SIZE ); - - if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - if( ssl->maclen == 16 ) - ssl_mac_md5( ssl->mac_dec, - ssl->in_msg, ssl->in_msglen, - ssl->in_ctr, ssl->in_msgtype ); - else if( ssl->maclen == 20 ) - ssl_mac_sha1( ssl->mac_dec, - ssl->in_msg, ssl->in_msglen, - ssl->in_ctr, ssl->in_msgtype ); - } - else - { - if( ssl->maclen == 16 ) - md5_hmac( ssl->mac_dec, 16, - ssl->in_ctr, ssl->in_msglen + 13, - ssl->in_msg + ssl->in_msglen ); - else if( ssl->maclen == 20 ) - sha1_hmac( ssl->mac_dec, 20, - ssl->in_ctr, ssl->in_msglen + 13, - ssl->in_msg + ssl->in_msglen ); - else if( ssl->maclen == 32 ) - sha2_hmac( ssl->mac_dec, 32, - ssl->in_ctr, ssl->in_msglen + 13, - ssl->in_msg + ssl->in_msglen, 0 ); - } - - SSL_DEBUG_BUF( 4, "message mac", tmp, ssl->maclen ); - SSL_DEBUG_BUF( 4, "computed mac", ssl->in_msg + ssl->in_msglen, - ssl->maclen ); - - if( memcmp( tmp, ssl->in_msg + ssl->in_msglen, - ssl->maclen ) != 0 ) - { - SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); - return( POLARSSL_ERR_SSL_INVALID_MAC ); - } - - /* - * Finally check the padding length; bad padding - * will produce the same error as an invalid MAC. - */ - if( ssl->ivlen != 0 && ssl->ivlen != 12 && padlen == 0 ) - return( POLARSSL_ERR_SSL_INVALID_MAC ); - - if( ssl->in_msglen == 0 ) - { - ssl->nb_zero++; - - /* - * Three or more empty messages may be a DoS attack - * (excessive CPU consumption). - */ - if( ssl->nb_zero > 3 ) - { - SSL_DEBUG_MSG( 1, ( "received four consecutive empty " - "messages, possible DoS attack" ) ); - return( POLARSSL_ERR_SSL_INVALID_MAC ); - } - } - else - ssl->nb_zero = 0; - - for( i = 8; i > 0; i-- ) - if( ++ssl->in_ctr[i - 1] != 0 ) - break; - - SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) ); - - return( 0 ); -} - -/* - * Fill the input message buffer - */ -int ssl_fetch_input( ssl_context *ssl, size_t nb_want ) -{ - int ret; - size_t len; - - SSL_DEBUG_MSG( 2, ( "=> fetch input" ) ); - - while( ssl->in_left < nb_want ) - { - len = nb_want - ssl->in_left; - ret = ssl->f_recv( ssl->p_recv, ssl->in_hdr + ssl->in_left, len ); - - SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", - ssl->in_left, nb_want ) ); - SSL_DEBUG_RET( 2, "ssl->f_recv", ret ); - - if( ret == 0 ) - return( POLARSSL_ERR_SSL_CONN_EOF ); - - if( ret < 0 ) - return( ret ); - - ssl->in_left += ret; - } - - SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); - - return( 0 ); -} - -/* - * Flush any data not yet written - */ -int ssl_flush_output( ssl_context *ssl ) -{ - int ret; - unsigned char *buf; - - SSL_DEBUG_MSG( 2, ( "=> flush output" ) ); - - while( ssl->out_left > 0 ) - { - SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d", - 5 + ssl->out_msglen, ssl->out_left ) ); - - buf = ssl->out_hdr + 5 + ssl->out_msglen - ssl->out_left; - ret = ssl->f_send( ssl->p_send, buf, ssl->out_left ); - SSL_DEBUG_RET( 2, "ssl->f_send", ret ); - - if( ret <= 0 ) - return( ret ); - - ssl->out_left -= ret; - } - - SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); - - return( 0 ); -} - -/* - * Record layer functions - */ -int ssl_write_record( ssl_context *ssl ) -{ - int ret; - size_t len = ssl->out_msglen; - - SSL_DEBUG_MSG( 2, ( "=> write record" ) ); - - ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype; - ssl->out_hdr[1] = (unsigned char) ssl->major_ver; - ssl->out_hdr[2] = (unsigned char) ssl->minor_ver; - ssl->out_hdr[3] = (unsigned char)( len >> 8 ); - ssl->out_hdr[4] = (unsigned char)( len ); - - if( ssl->out_msgtype == SSL_MSG_HANDSHAKE ) - { - ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 ); - ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 ); - ssl->out_msg[3] = (unsigned char)( ( len - 4 ) ); - - ssl->update_checksum( ssl, ssl->out_msg, len ); - } - - if( ssl->do_crypt != 0 ) - { - if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret ); - return( ret ); - } - - len = ssl->out_msglen; - ssl->out_hdr[3] = (unsigned char)( len >> 8 ); - ssl->out_hdr[4] = (unsigned char)( len ); - } - - ssl->out_left = 5 + ssl->out_msglen; - - SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, " - "version = [%d:%d], msglen = %d", - ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2], - ( ssl->out_hdr[3] << 8 ) | ssl->out_hdr[4] ) ); - - SSL_DEBUG_BUF( 4, "output record sent to network", - ssl->out_hdr, 5 + ssl->out_msglen ); - - if( ( ret = ssl_flush_output( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_flush_output", ret ); - return( ret ); - } - - SSL_DEBUG_MSG( 2, ( "<= write record" ) ); - - return( 0 ); -} - -int ssl_read_record( ssl_context *ssl ) -{ - int ret; - - SSL_DEBUG_MSG( 2, ( "=> read record" ) ); - - if( ssl->in_hslen != 0 && - ssl->in_hslen < ssl->in_msglen ) - { - /* - * Get next Handshake message in the current record - */ - ssl->in_msglen -= ssl->in_hslen; - - memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen, - ssl->in_msglen ); - - ssl->in_hslen = 4; - ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3]; - - SSL_DEBUG_MSG( 3, ( "handshake message: msglen =" - " %d, type = %d, hslen = %d", - ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) ); - - if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 ) - { - SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - if( ssl->in_msglen < ssl->in_hslen ) - { - SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - ssl->update_checksum( ssl, ssl->in_msg, ssl->in_hslen ); - - return( 0 ); - } - - ssl->in_hslen = 0; - - /* - * Read the record header and validate it - */ - if( ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); - return( ret ); - } - - ssl->in_msgtype = ssl->in_hdr[0]; - ssl->in_msglen = ( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4]; - - SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, " - "version = [%d:%d], msglen = %d", - ssl->in_hdr[0], ssl->in_hdr[1], ssl->in_hdr[2], - ( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4] ) ); - - if( ssl->in_hdr[1] != ssl->major_ver ) - { - SSL_DEBUG_MSG( 1, ( "major version mismatch" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - if( ssl->in_hdr[2] > ssl->max_minor_ver ) - { - SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - /* - * Make sure the message length is acceptable - */ - if( ssl->do_crypt == 0 ) - { - if( ssl->in_msglen < 1 || - ssl->in_msglen > SSL_MAX_CONTENT_LEN ) - { - SSL_DEBUG_MSG( 1, ( "bad message length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - } - else - { - if( ssl->in_msglen < ssl->minlen ) - { - SSL_DEBUG_MSG( 1, ( "bad message length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - if( ssl->minor_ver == SSL_MINOR_VERSION_0 && - ssl->in_msglen > ssl->minlen + SSL_MAX_CONTENT_LEN ) - { - SSL_DEBUG_MSG( 1, ( "bad message length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - /* - * TLS encrypted messages can have up to 256 bytes of padding - */ - if( ssl->minor_ver >= SSL_MINOR_VERSION_1 && - ssl->in_msglen > ssl->minlen + SSL_MAX_CONTENT_LEN + 256 ) - { - SSL_DEBUG_MSG( 1, ( "bad message length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - } - - /* - * Read and optionally decrypt the message contents - */ - if( ( ret = ssl_fetch_input( ssl, 5 + ssl->in_msglen ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); - return( ret ); - } - - SSL_DEBUG_BUF( 4, "input record from network", - ssl->in_hdr, 5 + ssl->in_msglen ); - - if( ssl->do_crypt != 0 ) - { - if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret ); - return( ret ); - } - - SSL_DEBUG_BUF( 4, "input payload after decrypt", - ssl->in_msg, ssl->in_msglen ); - - if( ssl->in_msglen > SSL_MAX_CONTENT_LEN ) - { - SSL_DEBUG_MSG( 1, ( "bad message length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - } - - if( ssl->in_msgtype != SSL_MSG_HANDSHAKE && - ssl->in_msgtype != SSL_MSG_ALERT && - ssl->in_msgtype != SSL_MSG_CHANGE_CIPHER_SPEC && - ssl->in_msgtype != SSL_MSG_APPLICATION_DATA ) - { - SSL_DEBUG_MSG( 1, ( "unknown record type" ) ); - - if( ( ret = ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL, - SSL_ALERT_MSG_UNEXPECTED_MESSAGE ) ) != 0 ) - { - return( ret ); - } - - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - if( ssl->in_msgtype == SSL_MSG_HANDSHAKE ) - { - ssl->in_hslen = 4; - ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3]; - - SSL_DEBUG_MSG( 3, ( "handshake message: msglen =" - " %d, type = %d, hslen = %d", - ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) ); - - /* - * Additional checks to validate the handshake header - */ - if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 ) - { - SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - if( ssl->in_msglen < ssl->in_hslen ) - { - SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); - return( POLARSSL_ERR_SSL_INVALID_RECORD ); - } - - ssl->update_checksum( ssl, ssl->in_msg, ssl->in_hslen ); - } - - if( ssl->in_msgtype == SSL_MSG_ALERT ) - { - SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]", - ssl->in_msg[0], ssl->in_msg[1] ) ); - - /* - * Ignore non-fatal alerts, except close_notify - */ - if( ssl->in_msg[0] == SSL_ALERT_LEVEL_FATAL ) - { - SSL_DEBUG_MSG( 1, ( "is a fatal alert message" ) ); - /** - * Subtract from error code as ssl->in_msg[1] is 7-bit positive - * error identifier. - */ - return( POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE - ssl->in_msg[1] ); - } - - if( ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING && - ssl->in_msg[1] == SSL_ALERT_MSG_CLOSE_NOTIFY ) - { - SSL_DEBUG_MSG( 2, ( "is a close notify message" ) ); - return( POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY ); - } - } - - ssl->in_left = 0; - - SSL_DEBUG_MSG( 2, ( "<= read record" ) ); - - return( 0 ); -} - -int ssl_send_alert_message( ssl_context *ssl, - unsigned char level, - unsigned char message ) -{ - int ret; - - SSL_DEBUG_MSG( 2, ( "=> send alert message" ) ); - - ssl->out_msgtype = SSL_MSG_ALERT; - ssl->out_msglen = 2; - ssl->out_msg[0] = level; - ssl->out_msg[1] = message; - - if( ( ret = ssl_write_record( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_write_record", ret ); - return( ret ); - } - - SSL_DEBUG_MSG( 2, ( "<= send alert message" ) ); - - return( 0 ); -} - -/* - * Handshake functions - */ -int ssl_write_certificate( ssl_context *ssl ) -{ - int ret; - size_t i, n; - const x509_cert *crt; - - SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); - - if( ssl->endpoint == SSL_IS_CLIENT ) - { - if( ssl->client_auth == 0 ) - { - SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); - ssl->state++; - return( 0 ); - } - - /* - * If using SSLv3 and got no cert, send an Alert message - * (otherwise an empty Certificate message will be sent). - */ - if( ssl->own_cert == NULL && - ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - ssl->out_msglen = 2; - ssl->out_msgtype = SSL_MSG_ALERT; - ssl->out_msg[0] = SSL_ALERT_LEVEL_WARNING; - ssl->out_msg[1] = SSL_ALERT_MSG_NO_CERT; - - SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) ); - goto write_msg; - } - } - else /* SSL_IS_SERVER */ - { - if( ssl->own_cert == NULL ) - { - SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) ); - return( POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED ); - } - } - - SSL_DEBUG_CRT( 3, "own certificate", ssl->own_cert ); - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 6 length of all certs - * 7 . 9 length of cert. 1 - * 10 . n-1 peer certificate - * n . n+2 length of cert. 2 - * n+3 . ... upper level cert, etc. - */ - i = 7; - crt = ssl->own_cert; - - while( crt != NULL ) - { - n = crt->raw.len; - if( i + 3 + n > SSL_MAX_CONTENT_LEN ) - { - SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d", - i + 3 + n, SSL_MAX_CONTENT_LEN ) ); - return( POLARSSL_ERR_SSL_CERTIFICATE_TOO_LARGE ); - } - - ssl->out_msg[i ] = (unsigned char)( n >> 16 ); - ssl->out_msg[i + 1] = (unsigned char)( n >> 8 ); - ssl->out_msg[i + 2] = (unsigned char)( n ); - - i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n ); - i += n; crt = crt->next; - } - - ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 ); - ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 ); - ssl->out_msg[6] = (unsigned char)( ( i - 7 ) ); - - ssl->out_msglen = i; - ssl->out_msgtype = SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = SSL_HS_CERTIFICATE; - -write_msg: - - 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" ) ); - - return( 0 ); -} - -int ssl_parse_certificate( ssl_context *ssl ) -{ - int ret; - size_t i, n; - - SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); - - if( ssl->endpoint == SSL_IS_SERVER && - ssl->authmode == SSL_VERIFY_NONE ) - { - ssl->verify_result = BADCERT_SKIP_VERIFY; - SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); - ssl->state++; - return( 0 ); - } - - if( ( ret = ssl_read_record( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_read_record", ret ); - return( ret ); - } - - ssl->state++; - - /* - * Check if the client sent an empty certificate - */ - if( ssl->endpoint == SSL_IS_SERVER && - ssl->minor_ver == SSL_MINOR_VERSION_0 ) - { - if( ssl->in_msglen == 2 && - ssl->in_msgtype == SSL_MSG_ALERT && - ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING && - ssl->in_msg[1] == SSL_ALERT_MSG_NO_CERT ) - { - SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) ); - - ssl->verify_result = BADCERT_MISSING; - if( ssl->authmode == SSL_VERIFY_OPTIONAL ) - return( 0 ); - else - return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE ); - } - } - - if( ssl->endpoint == SSL_IS_SERVER && - ssl->minor_ver != SSL_MINOR_VERSION_0 ) - { - if( ssl->in_hslen == 7 && - ssl->in_msgtype == SSL_MSG_HANDSHAKE && - ssl->in_msg[0] == SSL_HS_CERTIFICATE && - memcmp( ssl->in_msg + 4, "\0\0\0", 3 ) == 0 ) - { - SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) ); - - ssl->verify_result = BADCERT_MISSING; - if( ssl->authmode == SSL_VERIFY_REQUIRED ) - return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE ); - else - return( 0 ); - } - } - - if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) - { - SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - if( ssl->in_msg[0] != SSL_HS_CERTIFICATE || ssl->in_hslen < 10 ) - { - SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* - * Same message structure as in ssl_write_certificate() - */ - n = ( ssl->in_msg[5] << 8 ) | ssl->in_msg[6]; - - if( ssl->in_msg[4] != 0 || ssl->in_hslen != 7 + n ) - { - SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - if( ( ssl->peer_cert = (x509_cert *) malloc( - sizeof( x509_cert ) ) ) == NULL ) - { - SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", - sizeof( x509_cert ) ) ); - return( POLARSSL_ERR_SSL_MALLOC_FAILED ); - } - - memset( ssl->peer_cert, 0, sizeof( x509_cert ) ); - - i = 7; - - while( i < ssl->in_hslen ) - { - if( ssl->in_msg[i] != 0 ) - { - SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - n = ( (unsigned int) ssl->in_msg[i + 1] << 8 ) - | (unsigned int) ssl->in_msg[i + 2]; - i += 3; - - if( n < 128 || i + n > ssl->in_hslen ) - { - SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - ret = x509parse_crt( ssl->peer_cert, ssl->in_msg + i, n ); - if( ret != 0 ) - { - SSL_DEBUG_RET( 1, " x509parse_crt", ret ); - return( ret ); - } - - i += n; - } - - SSL_DEBUG_CRT( 3, "peer certificate", ssl->peer_cert ); - - if( ssl->authmode != SSL_VERIFY_NONE ) - { - if( ssl->ca_chain == NULL ) - { - SSL_DEBUG_MSG( 1, ( "got no CA chain" ) ); - return( POLARSSL_ERR_SSL_CA_CHAIN_REQUIRED ); - } - - ret = x509parse_verify( ssl->peer_cert, ssl->ca_chain, ssl->ca_crl, - ssl->peer_cn, &ssl->verify_result, - ssl->f_vrfy, ssl->p_vrfy ); - - if( ret != 0 ) - SSL_DEBUG_RET( 1, "x509_verify_cert", ret ); - - if( ssl->authmode != SSL_VERIFY_REQUIRED ) - ret = 0; - } - - SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); - - return( ret ); -} - -int ssl_write_change_cipher_spec( ssl_context *ssl ) -{ - int ret; - - SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) ); - - ssl->out_msgtype = SSL_MSG_CHANGE_CIPHER_SPEC; - ssl->out_msglen = 1; - ssl->out_msg[0] = 1; - - ssl->do_crypt = 0; - ssl->state++; - - if( ( ret = ssl_write_record( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_write_record", ret ); - return( ret ); - } - - SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) ); - - return( 0 ); -} - -int ssl_parse_change_cipher_spec( ssl_context *ssl ) -{ - int ret; - - SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) ); - - ssl->do_crypt = 0; - - if( ( ret = ssl_read_record( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != SSL_MSG_CHANGE_CIPHER_SPEC ) - { - SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); - return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 ) - { - SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); - return( POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC ); - } - - ssl->state++; - - SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) ); - - return( 0 ); -} - -void ssl_kickstart_checksum( ssl_context *ssl, int ciphersuite, - unsigned char *input_buf, size_t len ) -{ - if( ssl->minor_ver < SSL_MINOR_VERSION_3 ) - { - md5_starts( (md5_context *) ssl->ctx_checksum ); - sha1_starts( (sha1_context *) ( ssl->ctx_checksum + - sizeof(md5_context) ) ); - - ssl->update_checksum = ssl_update_checksum_md5sha1; - } - else if ( ciphersuite == SSL_RSA_AES_256_GCM_SHA384 || - ciphersuite == SSL_EDH_RSA_AES_256_GCM_SHA384 ) - { - sha4_starts( (sha4_context *) ssl->ctx_checksum, 1 ); - ssl->update_checksum = ssl_update_checksum_sha384; - } - else - { - sha2_starts( (sha2_context *) ssl->ctx_checksum, 0 ); - ssl->update_checksum = ssl_update_checksum_sha256; - } - - if( ssl->endpoint == SSL_IS_CLIENT ) - ssl->update_checksum( ssl, ssl->out_msg, ssl->out_msglen ); - ssl->update_checksum( ssl, input_buf, len ); -} - -static void ssl_update_checksum_start( ssl_context *ssl, unsigned char *buf, - size_t len ) -{ - ((void) ssl); - ((void) buf); - ((void) len); -} - -static void ssl_update_checksum_md5sha1( ssl_context *ssl, unsigned char *buf, - size_t len ) -{ - md5_update( (md5_context *) ssl->ctx_checksum, buf, len ); - sha1_update( (sha1_context *) ( ssl->ctx_checksum + sizeof(md5_context) ), - buf, len ); -} - -static void ssl_update_checksum_sha256( ssl_context *ssl, unsigned char *buf, - size_t len ) -{ - sha2_update( (sha2_context *) ssl->ctx_checksum, buf, len ); -} - -static void ssl_update_checksum_sha384( ssl_context *ssl, unsigned char *buf, - size_t len ) -{ - sha4_update( (sha4_context *) ssl->ctx_checksum, buf, len ); -} - -static void ssl_calc_finished_ssl( - ssl_context *ssl, unsigned char *buf, int from ) -{ - char *sender; - md5_context md5; - sha1_context sha1; - - unsigned char padbuf[48]; - unsigned char md5sum[16]; - unsigned char sha1sum[20]; - - SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) ); - - memcpy( &md5 , (md5_context *) ssl->ctx_checksum, sizeof(md5_context) ); - memcpy( &sha1, (sha1_context *) ( ssl->ctx_checksum + sizeof(md5_context) ), - sizeof( sha1_context ) ); - - /* - * SSLv3: - * hash = - * MD5( master + pad2 + - * MD5( handshake + sender + master + pad1 ) ) - * + SHA1( master + pad2 + - * SHA1( handshake + sender + master + pad1 ) ) - */ - - SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) - md5.state, sizeof( md5.state ) ); - - SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) - sha1.state, sizeof( sha1.state ) ); - - sender = ( from == SSL_IS_CLIENT ) ? (char *) "CLNT" - : (char *) "SRVR"; - - memset( padbuf, 0x36, 48 ); - - md5_update( &md5, (unsigned char *) sender, 4 ); - md5_update( &md5, ssl->session->master, 48 ); - md5_update( &md5, padbuf, 48 ); - md5_finish( &md5, md5sum ); - - sha1_update( &sha1, (unsigned char *) sender, 4 ); - sha1_update( &sha1, ssl->session->master, 48 ); - sha1_update( &sha1, padbuf, 40 ); - sha1_finish( &sha1, sha1sum ); - - memset( padbuf, 0x5C, 48 ); - - md5_starts( &md5 ); - md5_update( &md5, ssl->session->master, 48 ); - md5_update( &md5, padbuf, 48 ); - md5_update( &md5, md5sum, 16 ); - md5_finish( &md5, buf ); - - sha1_starts( &sha1 ); - sha1_update( &sha1, ssl->session->master, 48 ); - sha1_update( &sha1, padbuf , 40 ); - sha1_update( &sha1, sha1sum, 20 ); - sha1_finish( &sha1, buf + 16 ); - - SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 ); - - memset( &md5, 0, sizeof( md5_context ) ); - memset( &sha1, 0, sizeof( sha1_context ) ); - - memset( padbuf, 0, sizeof( padbuf ) ); - memset( md5sum, 0, sizeof( md5sum ) ); - memset( sha1sum, 0, sizeof( sha1sum ) ); - - SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} - -static void ssl_calc_finished_tls( - ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - char *sender; - md5_context md5; - sha1_context sha1; - unsigned char padbuf[36]; - - SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) ); - - memcpy( &md5 , (md5_context *) ssl->ctx_checksum, sizeof(md5_context) ); - memcpy( &sha1, (sha1_context *) ( ssl->ctx_checksum + sizeof(md5_context) ), - sizeof( sha1_context ) ); - - /* - * TLSv1: - * hash = PRF( master, finished_label, - * MD5( handshake ) + SHA1( handshake ) )[0..11] - */ - - SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) - md5.state, sizeof( md5.state ) ); - - SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) - sha1.state, sizeof( sha1.state ) ); - - sender = ( from == SSL_IS_CLIENT ) - ? (char *) "client finished" - : (char *) "server finished"; - - md5_finish( &md5, padbuf ); - sha1_finish( &sha1, padbuf + 16 ); - - ssl->tls_prf( ssl->session->master, 48, sender, - padbuf, 36, buf, len ); - - SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - memset( &md5, 0, sizeof( md5_context ) ); - memset( &sha1, 0, sizeof( sha1_context ) ); - - memset( padbuf, 0, sizeof( padbuf ) ); - - SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} - -static void ssl_calc_finished_tls_sha256( - ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - char *sender; - sha2_context sha2; - unsigned char padbuf[32]; - - SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) ); - - memcpy( &sha2 , (sha2_context *) ssl->ctx_checksum, sizeof(sha2_context) ); - - /* - * TLSv1.2: - * hash = PRF( master, finished_label, - * Hash( handshake ) )[0.11] - */ - - SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *) - sha2.state, sizeof( sha2.state ) ); - - sender = ( from == SSL_IS_CLIENT ) - ? (char *) "client finished" - : (char *) "server finished"; - - sha2_finish( &sha2, padbuf ); - - ssl->tls_prf( ssl->session->master, 48, sender, - padbuf, 32, buf, len ); - - SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - memset( &sha2, 0, sizeof( sha2_context ) ); - - memset( padbuf, 0, sizeof( padbuf ) ); - - SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} - -static void ssl_calc_finished_tls_sha384( - ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - char *sender; - sha4_context sha4; - unsigned char padbuf[48]; - - SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) ); - - memcpy( &sha4 , (sha4_context *) ssl->ctx_checksum, sizeof(sha4_context) ); - - /* - * TLSv1.2: - * hash = PRF( master, finished_label, - * Hash( handshake ) )[0.11] - */ - - SSL_DEBUG_BUF( 4, "finished sha4 state", (unsigned char *) - sha4.state, sizeof( sha4.state ) ); - - sender = ( from == SSL_IS_CLIENT ) - ? (char *) "client finished" - : (char *) "server finished"; - - sha4_finish( &sha4, padbuf ); - - ssl->tls_prf( ssl->session->master, 48, sender, - padbuf, 48, buf, len ); - - SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - memset( &sha4, 0, sizeof( sha4_context ) ); - - memset( padbuf, 0, sizeof( padbuf ) ); - - SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} - -int ssl_write_finished( ssl_context *ssl ) -{ - int ret, hash_len; - - SSL_DEBUG_MSG( 2, ( "=> write finished" ) ); - - ssl->calc_finished( ssl, ssl->out_msg + 4, ssl->endpoint ); - - // TODO TLS/1.2 Hash length is determined by cipher suite (Page 63) - hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12; - - ssl->out_msglen = 4 + hash_len; - ssl->out_msgtype = SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = SSL_HS_FINISHED; - - /* - * In case of session resuming, invert the client and server - * ChangeCipherSpec messages order. - */ - if( ssl->resume != 0 ) - { - if( ssl->endpoint == SSL_IS_CLIENT ) - ssl->state = SSL_HANDSHAKE_OVER; - else - ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC; - } - else - ssl->state++; - - ssl->do_crypt = 1; - - if( ( ret = ssl_write_record( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_write_record", ret ); - return( ret ); - } - - SSL_DEBUG_MSG( 2, ( "<= write finished" ) ); - - return( 0 ); -} - -int ssl_parse_finished( ssl_context *ssl ) -{ - int ret; - unsigned int hash_len; - unsigned char buf[36]; - - SSL_DEBUG_MSG( 2, ( "=> parse finished" ) ); - - ssl->calc_finished( ssl, buf, ssl->endpoint ^ 1 ); - - ssl->do_crypt = 1; - - 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 finished message" ) ); - return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - // TODO TLS/1.2 Hash length is determined by cipher suite (Page 63) - hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12; - - if( ssl->in_msg[0] != SSL_HS_FINISHED || - ssl->in_hslen != 4 + hash_len ) - { - SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - return( POLARSSL_ERR_SSL_BAD_HS_FINISHED ); - } - - if( memcmp( ssl->in_msg + 4, buf, hash_len ) != 0 ) - { - SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - return( POLARSSL_ERR_SSL_BAD_HS_FINISHED ); - } - - if( ssl->resume != 0 ) - { - if( ssl->endpoint == SSL_IS_CLIENT ) - ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC; - - if( ssl->endpoint == SSL_IS_SERVER ) - ssl->state = SSL_HANDSHAKE_OVER; - } - else - ssl->state++; - - SSL_DEBUG_MSG( 2, ( "<= parse finished" ) ); - - return( 0 ); -} - -/* - * Initialize an SSL context - */ -int ssl_init( ssl_context *ssl ) -{ - int len = SSL_BUFFER_LEN; - - memset( ssl, 0, sizeof( ssl_context ) ); - - ssl->in_ctr = (unsigned char *) malloc( len ); - ssl->in_hdr = ssl->in_ctr + 8; - ssl->in_msg = ssl->in_ctr + 13; - - if( ssl->in_ctr == NULL ) - { - SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) ); - return( POLARSSL_ERR_SSL_MALLOC_FAILED ); - } - - ssl->out_ctr = (unsigned char *) malloc( len ); - ssl->out_hdr = ssl->out_ctr + 8; - ssl->out_msg = ssl->out_ctr + 13; - - if( ssl->out_ctr == NULL ) - { - SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) ); - free( ssl-> in_ctr ); - return( POLARSSL_ERR_SSL_MALLOC_FAILED ); - } - - memset( ssl-> in_ctr, 0, SSL_BUFFER_LEN ); - memset( ssl->out_ctr, 0, SSL_BUFFER_LEN ); - - ssl->hostname = NULL; - ssl->hostname_len = 0; - - ssl->update_checksum = ssl_update_checksum_start; - - return( 0 ); -} - -/* - * Reset an initialized and used SSL context for re-use while retaining - * all application-set variables, function pointers and data. - */ -void ssl_session_reset( ssl_context *ssl ) -{ - ssl->state = SSL_HELLO_REQUEST; - - ssl->in_offt = NULL; - - ssl->in_msgtype = 0; - ssl->in_msglen = 0; - ssl->in_left = 0; - - ssl->in_hslen = 0; - ssl->nb_zero = 0; - - ssl->out_msgtype = 0; - ssl->out_msglen = 0; - ssl->out_left = 0; - - ssl->do_crypt = 0; - ssl->pmslen = 0; - ssl->keylen = 0; - ssl->minlen = 0; - ssl->ivlen = 0; - ssl->maclen = 0; - - memset( ssl->out_ctr, 0, SSL_BUFFER_LEN ); - memset( ssl->in_ctr, 0, SSL_BUFFER_LEN ); - memset( ssl->randbytes, 0, 64 ); - memset( ssl->premaster, 0, 256 ); - memset( ssl->iv_enc, 0, 16 ); - memset( ssl->iv_dec, 0, 16 ); - memset( ssl->mac_enc, 0, 32 ); - memset( ssl->mac_dec, 0, 32 ); - memset( ssl->ctx_enc, 0, 128 ); - memset( ssl->ctx_dec, 0, 128 ); - - ssl->update_checksum = ssl_update_checksum_start; -} - -/* - * SSL set accessors - */ -void ssl_set_endpoint( ssl_context *ssl, int endpoint ) -{ - ssl->endpoint = endpoint; -} - -void ssl_set_authmode( ssl_context *ssl, int authmode ) -{ - ssl->authmode = authmode; -} - -void ssl_set_verify( ssl_context *ssl, - int (*f_vrfy)(void *, x509_cert *, int, int), - void *p_vrfy ) -{ - ssl->f_vrfy = f_vrfy; - ssl->p_vrfy = p_vrfy; -} - -void ssl_set_rng( ssl_context *ssl, - int (*f_rng)(void *, unsigned char *, size_t), - void *p_rng ) -{ - ssl->f_rng = f_rng; - ssl->p_rng = p_rng; -} - -void ssl_set_dbg( ssl_context *ssl, - void (*f_dbg)(void *, int, const char *), - void *p_dbg ) -{ - ssl->f_dbg = f_dbg; - ssl->p_dbg = p_dbg; -} - -void ssl_set_bio( ssl_context *ssl, - int (*f_recv)(void *, unsigned char *, size_t), void *p_recv, - int (*f_send)(void *, const unsigned char *, size_t), void *p_send ) -{ - ssl->f_recv = f_recv; - ssl->f_send = f_send; - ssl->p_recv = p_recv; - ssl->p_send = p_send; -} - -void ssl_set_scb( ssl_context *ssl, - int (*s_get)(ssl_context *), - int (*s_set)(ssl_context *) ) -{ - ssl->s_get = s_get; - ssl->s_set = s_set; -} - -void ssl_set_session( ssl_context *ssl, int resume, int timeout, - ssl_session *session ) -{ - ssl->resume = resume; - ssl->timeout = timeout; - ssl->session = session; -} - -void ssl_set_ciphersuites( ssl_context *ssl, int *ciphersuites ) -{ - ssl->ciphersuites = ciphersuites; -} - -void ssl_set_ca_chain( ssl_context *ssl, x509_cert *ca_chain, - x509_crl *ca_crl, const char *peer_cn ) -{ - ssl->ca_chain = ca_chain; - ssl->ca_crl = ca_crl; - ssl->peer_cn = peer_cn; -} - -void ssl_set_own_cert( ssl_context *ssl, x509_cert *own_cert, - rsa_context *rsa_key ) -{ - ssl->own_cert = own_cert; - ssl->rsa_key = rsa_key; -} - -#if defined(POLARSSL_PKCS11_C) -void ssl_set_own_cert_pkcs11( ssl_context *ssl, x509_cert *own_cert, - pkcs11_context *pkcs11_key ) -{ - ssl->own_cert = own_cert; - ssl->pkcs11_key = pkcs11_key; -} -#endif - -int ssl_set_dh_param( ssl_context *ssl, const char *dhm_P, const char *dhm_G ) -{ - int ret; - - if( ( ret = mpi_read_string( &ssl->dhm_ctx.P, 16, dhm_P ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "mpi_read_string", ret ); - return( ret ); - } - - if( ( ret = mpi_read_string( &ssl->dhm_ctx.G, 16, dhm_G ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "mpi_read_string", ret ); - return( ret ); - } - - return( 0 ); -} - -int ssl_set_dh_param_ctx( ssl_context *ssl, dhm_context *dhm_ctx ) -{ - int ret; - - if( ( ret = mpi_copy(&ssl->dhm_ctx.P, &dhm_ctx->P) ) != 0 ) - { - SSL_DEBUG_RET( 1, "mpi_copy", ret ); - return( ret ); - } - - if( ( ret = mpi_copy(&ssl->dhm_ctx.G, &dhm_ctx->G) ) != 0 ) - { - SSL_DEBUG_RET( 1, "mpi_copy", ret ); - return( ret ); - } - - return( 0 ); -} - -int ssl_set_hostname( ssl_context *ssl, const char *hostname ) -{ - if( hostname == NULL ) - return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); - - ssl->hostname_len = strlen( hostname ); - ssl->hostname = (unsigned char *) malloc( ssl->hostname_len + 1 ); - - if( ssl->hostname == NULL ) - return( POLARSSL_ERR_SSL_MALLOC_FAILED ); - - memcpy( ssl->hostname, (unsigned char *) hostname, - ssl->hostname_len ); - - ssl->hostname[ssl->hostname_len] = '\0'; - - return( 0 ); -} - -void ssl_set_max_version( ssl_context *ssl, int major, int minor ) -{ - ssl->max_major_ver = major; - ssl->max_minor_ver = minor; -} - -/* - * SSL get accessors - */ -size_t ssl_get_bytes_avail( const ssl_context *ssl ) -{ - return( ssl->in_offt == NULL ? 0 : ssl->in_msglen ); -} - -int ssl_get_verify_result( const ssl_context *ssl ) -{ - return( ssl->verify_result ); -} - -const char *ssl_get_ciphersuite_name( const int ciphersuite_id ) -{ - switch( ciphersuite_id ) - { -#if defined(POLARSSL_ARC4_C) - case SSL_RSA_RC4_128_MD5: - return( "SSL-RSA-RC4-128-MD5" ); - - case SSL_RSA_RC4_128_SHA: - return( "SSL-RSA-RC4-128-SHA" ); -#endif - -#if defined(POLARSSL_DES_C) - case SSL_RSA_DES_168_SHA: - return( "SSL-RSA-DES-168-SHA" ); - - case SSL_EDH_RSA_DES_168_SHA: - return( "SSL-EDH-RSA-DES-168-SHA" ); -#endif - -#if defined(POLARSSL_AES_C) - case SSL_RSA_AES_128_SHA: - return( "SSL-RSA-AES-128-SHA" ); - - case SSL_EDH_RSA_AES_128_SHA: - return( "SSL-EDH-RSA-AES-128-SHA" ); - - case SSL_RSA_AES_256_SHA: - return( "SSL-RSA-AES-256-SHA" ); - - case SSL_EDH_RSA_AES_256_SHA: - return( "SSL-EDH-RSA-AES-256-SHA" ); - -#if defined(POLARSSL_SHA2_C) - case SSL_RSA_AES_128_SHA256: - return( "SSL-RSA-AES-128-SHA256" ); - - case SSL_EDH_RSA_AES_128_SHA256: - return( "SSL-EDH-RSA-AES-128-SHA256" ); - - case SSL_RSA_AES_256_SHA256: - return( "SSL-RSA-AES-256-SHA256" ); - - case SSL_EDH_RSA_AES_256_SHA256: - return( "SSL-EDH-RSA-AES-256-SHA256" ); -#endif - -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C) - case SSL_RSA_AES_128_GCM_SHA256: - return( "SSL-RSA-AES-128-GCM-SHA256" ); - - case SSL_EDH_RSA_AES_128_GCM_SHA256: - return( "SSL-EDH-RSA-AES-128-GCM-SHA256" ); -#endif - -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA4_C) - case SSL_RSA_AES_256_GCM_SHA384: - return( "SSL-RSA-AES-256-GCM-SHA384" ); - - case SSL_EDH_RSA_AES_256_GCM_SHA384: - return( "SSL-EDH-RSA-AES-256-GCM-SHA384" ); -#endif -#endif /* POLARSSL_AES_C */ - -#if defined(POLARSSL_CAMELLIA_C) - case SSL_RSA_CAMELLIA_128_SHA: - return( "SSL-RSA-CAMELLIA-128-SHA" ); - - case SSL_EDH_RSA_CAMELLIA_128_SHA: - return( "SSL-EDH-RSA-CAMELLIA-128-SHA" ); - - case SSL_RSA_CAMELLIA_256_SHA: - return( "SSL-RSA-CAMELLIA-256-SHA" ); - - case SSL_EDH_RSA_CAMELLIA_256_SHA: - return( "SSL-EDH-RSA-CAMELLIA-256-SHA" ); - -#if defined(POLARSSL_SHA2_C) - case SSL_RSA_CAMELLIA_128_SHA256: - return( "SSL-RSA-CAMELLIA-128-SHA256" ); - - case SSL_EDH_RSA_CAMELLIA_128_SHA256: - return( "SSL-EDH-RSA-CAMELLIA-128-SHA256" ); - - case SSL_RSA_CAMELLIA_256_SHA256: - return( "SSL-RSA-CAMELLIA-256-SHA256" ); - - case SSL_EDH_RSA_CAMELLIA_256_SHA256: - return( "SSL-EDH-RSA-CAMELLIA-256-SHA256" ); -#endif -#endif - -#if defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) -#if defined(POLARSSL_CIPHER_NULL_CIPHER) - case SSL_RSA_NULL_MD5: - return( "SSL-RSA-NULL-MD5" ); - case SSL_RSA_NULL_SHA: - return( "SSL-RSA-NULL-SHA" ); - case SSL_RSA_NULL_SHA256: - return( "SSL-RSA-NULL-SHA256" ); -#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */ - -#if defined(POLARSSL_DES_C) - case SSL_RSA_DES_SHA: - return( "SSL-RSA-DES-SHA" ); - case SSL_EDH_RSA_DES_SHA: - return( "SSL-EDH-RSA-DES-SHA" ); -#endif -#endif /* defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) */ - - default: - break; - } - - return( "unknown" ); -} - -int ssl_get_ciphersuite_id( const char *ciphersuite_name ) -{ -#if defined(POLARSSL_ARC4_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-RC4-128-MD5")) - return( SSL_RSA_RC4_128_MD5 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-RC4-128-SHA")) - return( SSL_RSA_RC4_128_SHA ); -#endif - -#if defined(POLARSSL_DES_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-DES-168-SHA")) - return( SSL_RSA_DES_168_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-DES-168-SHA")) - return( SSL_EDH_RSA_DES_168_SHA ); -#endif - -#if defined(POLARSSL_AES_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-128-SHA")) - return( SSL_RSA_AES_128_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-128-SHA")) - return( SSL_EDH_RSA_AES_128_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-256-SHA")) - return( SSL_RSA_AES_256_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-256-SHA")) - return( SSL_EDH_RSA_AES_256_SHA ); - -#if defined(POLARSSL_SHA2_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-128-SHA256")) - return( SSL_RSA_AES_128_SHA256 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-128-SHA256")) - return( SSL_EDH_RSA_AES_128_SHA256 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-256-SHA256")) - return( SSL_RSA_AES_256_SHA256 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-256-SHA256")) - return( SSL_EDH_RSA_AES_256_SHA256 ); -#endif - -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-128-GCM-SHA256")) - return( SSL_RSA_AES_128_GCM_SHA256 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-128-GCM-SHA256")) - return( SSL_EDH_RSA_AES_128_GCM_SHA256 ); -#endif - -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-AES-256-GCM-SHA384")) - return( SSL_RSA_AES_256_GCM_SHA384 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-AES-256-GCM-SHA384")) - return( SSL_EDH_RSA_AES_256_GCM_SHA384 ); -#endif -#endif - -#if defined(POLARSSL_CAMELLIA_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-128-SHA")) - return( SSL_RSA_CAMELLIA_128_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-128-SHA")) - return( SSL_EDH_RSA_CAMELLIA_128_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-256-SHA")) - return( SSL_RSA_CAMELLIA_256_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-256-SHA")) - return( SSL_EDH_RSA_CAMELLIA_256_SHA ); - -#if defined(POLARSSL_SHA2_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-128-SHA256")) - return( SSL_RSA_CAMELLIA_128_SHA256 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-128-SHA256")) - return( SSL_EDH_RSA_CAMELLIA_128_SHA256 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-CAMELLIA-256-SHA256")) - return( SSL_RSA_CAMELLIA_256_SHA256 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-CAMELLIA-256-SHA256")) - return( SSL_EDH_RSA_CAMELLIA_256_SHA256 ); -#endif -#endif - -#if defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) -#if defined(POLARSSL_CIPHER_NULL_CIPHER) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-NULL-MD5")) - return( SSL_RSA_NULL_MD5 ); - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-NULL-SHA")) - return( SSL_RSA_NULL_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-NULL-SHA256")) - return( SSL_RSA_NULL_SHA256 ); -#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */ - -#if defined(POLARSSL_DES_C) - if (0 == strcasecmp(ciphersuite_name, "SSL-RSA-DES-SHA")) - return( SSL_RSA_DES_SHA ); - if (0 == strcasecmp(ciphersuite_name, "SSL-EDH-RSA-DES-SHA")) - return( SSL_EDH_RSA_DES_SHA ); -#endif -#endif /* defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES) */ - - return( 0 ); -} - -const char *ssl_get_ciphersuite( const ssl_context *ssl ) -{ - return ssl_get_ciphersuite_name( ssl->session->ciphersuite ); -} - -const char *ssl_get_version( const ssl_context *ssl ) -{ - switch( ssl->minor_ver ) - { - case SSL_MINOR_VERSION_0: - return( "SSLv3.0" ); - - case SSL_MINOR_VERSION_1: - return( "TLSv1.0" ); - - case SSL_MINOR_VERSION_2: - return( "TLSv1.1" ); - - case SSL_MINOR_VERSION_3: - return( "TLSv1.2" ); - - default: - break; - } - return( "unknown" ); -} - -int ssl_default_ciphersuites[] = -{ -#if defined(POLARSSL_DHM_C) -#if defined(POLARSSL_AES_C) -#if defined(POLARSSL_SHA2_C) - SSL_EDH_RSA_AES_256_SHA256, -#endif /* POLARSSL_SHA2_C */ -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA4_C) - SSL_EDH_RSA_AES_256_GCM_SHA384, -#endif - SSL_EDH_RSA_AES_256_SHA, -#if defined(POLARSSL_SHA2_C) - SSL_EDH_RSA_AES_128_SHA256, -#endif -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C) - SSL_EDH_RSA_AES_128_GCM_SHA256, -#endif - SSL_EDH_RSA_AES_128_SHA, -#endif -#if defined(POLARSSL_CAMELLIA_C) -#if defined(POLARSSL_SHA2_C) - SSL_EDH_RSA_CAMELLIA_256_SHA256, -#endif /* POLARSSL_SHA2_C */ - SSL_EDH_RSA_CAMELLIA_256_SHA, -#if defined(POLARSSL_SHA2_C) - SSL_EDH_RSA_CAMELLIA_128_SHA256, -#endif /* POLARSSL_SHA2_C */ - SSL_EDH_RSA_CAMELLIA_128_SHA, -#endif -#if defined(POLARSSL_DES_C) - SSL_EDH_RSA_DES_168_SHA, -#endif -#endif - -#if defined(POLARSSL_AES_C) -#if defined(POLARSSL_SHA2_C) - SSL_RSA_AES_256_SHA256, -#endif /* POLARSSL_SHA2_C */ -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA4_C) - SSL_RSA_AES_256_GCM_SHA384, -#endif /* POLARSSL_SHA2_C */ - SSL_RSA_AES_256_SHA, -#endif -#if defined(POLARSSL_CAMELLIA_C) -#if defined(POLARSSL_SHA2_C) - SSL_RSA_CAMELLIA_256_SHA256, -#endif /* POLARSSL_SHA2_C */ - SSL_RSA_CAMELLIA_256_SHA, -#endif -#if defined(POLARSSL_AES_C) -#if defined(POLARSSL_SHA2_C) - SSL_RSA_AES_128_SHA256, -#endif /* POLARSSL_SHA2_C */ -#if defined(POLARSSL_GCM_C) && defined(POLARSSL_SHA2_C) - SSL_RSA_AES_128_GCM_SHA256, -#endif /* POLARSSL_SHA2_C */ - SSL_RSA_AES_128_SHA, -#endif -#if defined(POLARSSL_CAMELLIA_C) -#if defined(POLARSSL_SHA2_C) - SSL_RSA_CAMELLIA_128_SHA256, -#endif /* POLARSSL_SHA2_C */ - SSL_RSA_CAMELLIA_128_SHA, -#endif -#if defined(POLARSSL_DES_C) - SSL_RSA_DES_168_SHA, -#endif -#if defined(POLARSSL_ARC4_C) - SSL_RSA_RC4_128_SHA, - SSL_RSA_RC4_128_MD5, -#endif - 0 -}; - -/* - * Perform the SSL handshake - */ -int ssl_handshake( ssl_context *ssl ) -{ - int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; - - SSL_DEBUG_MSG( 2, ( "=> handshake" ) ); - -#if defined(POLARSSL_SSL_CLI_C) - if( ssl->endpoint == SSL_IS_CLIENT ) - ret = ssl_handshake_client( ssl ); -#endif - -#if defined(POLARSSL_SSL_SRV_C) - if( ssl->endpoint == SSL_IS_SERVER ) - ret = ssl_handshake_server( ssl ); -#endif - - SSL_DEBUG_MSG( 2, ( "<= handshake" ) ); - - return( ret ); -} - -/* - * Receive application data decrypted from the SSL layer - */ -int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len ) -{ - int ret; - size_t n; - - SSL_DEBUG_MSG( 2, ( "=> read" ) ); - - if( ssl->state != SSL_HANDSHAKE_OVER ) - { - if( ( ret = ssl_handshake( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_handshake", ret ); - return( ret ); - } - } - - if( ssl->in_offt == NULL ) - { - if( ( ret = ssl_read_record( ssl ) ) != 0 ) - { - if( ret == POLARSSL_ERR_SSL_CONN_EOF ) - return( 0 ); - - SSL_DEBUG_RET( 1, "ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msglen == 0 && - ssl->in_msgtype == SSL_MSG_APPLICATION_DATA ) - { - /* - * OpenSSL sends empty messages to randomize the IV - */ - if( ( ret = ssl_read_record( ssl ) ) != 0 ) - { - if( ret == POLARSSL_ERR_SSL_CONN_EOF ) - return( 0 ); - - SSL_DEBUG_RET( 1, "ssl_read_record", ret ); - return( ret ); - } - } - - if( ssl->in_msgtype != SSL_MSG_APPLICATION_DATA ) - { - SSL_DEBUG_MSG( 1, ( "bad application data message" ) ); - return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - ssl->in_offt = ssl->in_msg; - } - - n = ( len < ssl->in_msglen ) - ? len : ssl->in_msglen; - - memcpy( buf, ssl->in_offt, n ); - ssl->in_msglen -= n; - - if( ssl->in_msglen == 0 ) - /* all bytes consumed */ - ssl->in_offt = NULL; - else - /* more data available */ - ssl->in_offt += n; - - SSL_DEBUG_MSG( 2, ( "<= read" ) ); - - return( (int) n ); -} - -/* - * Send application data to be encrypted by the SSL layer - */ -int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len ) -{ - int ret; - size_t n; - - SSL_DEBUG_MSG( 2, ( "=> write" ) ); - - if( ssl->state != SSL_HANDSHAKE_OVER ) - { - if( ( ret = ssl_handshake( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_handshake", ret ); - return( ret ); - } - } - - n = ( len < SSL_MAX_CONTENT_LEN ) - ? len : SSL_MAX_CONTENT_LEN; - - if( ssl->out_left != 0 ) - { - if( ( ret = ssl_flush_output( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_flush_output", ret ); - return( ret ); - } - } - else - { - ssl->out_msglen = n; - ssl->out_msgtype = SSL_MSG_APPLICATION_DATA; - memcpy( ssl->out_msg, buf, n ); - - if( ( ret = ssl_write_record( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_write_record", ret ); - return( ret ); - } - } - - SSL_DEBUG_MSG( 2, ( "<= write" ) ); - - return( (int) n ); -} - -/* - * Notify the peer that the connection is being closed - */ -int ssl_close_notify( ssl_context *ssl ) -{ - int ret; - - SSL_DEBUG_MSG( 2, ( "=> write close notify" ) ); - - if( ( ret = ssl_flush_output( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_flush_output", ret ); - return( ret ); - } - - if( ssl->state == SSL_HANDSHAKE_OVER ) - { - ssl->out_msgtype = SSL_MSG_ALERT; - ssl->out_msglen = 2; - ssl->out_msg[0] = SSL_ALERT_LEVEL_WARNING; - ssl->out_msg[1] = SSL_ALERT_MSG_CLOSE_NOTIFY; - - if( ( ret = ssl_write_record( ssl ) ) != 0 ) - { - SSL_DEBUG_RET( 1, "ssl_write_record", ret ); - return( ret ); - } - } - - SSL_DEBUG_MSG( 2, ( "<= write close notify" ) ); - - return( ret ); -} - -/* - * Free an SSL context - */ -void ssl_free( ssl_context *ssl ) -{ - SSL_DEBUG_MSG( 2, ( "=> free" ) ); - - if( ssl->peer_cert != NULL ) - { - x509_free( ssl->peer_cert ); - memset( ssl->peer_cert, 0, sizeof( x509_cert ) ); - free( ssl->peer_cert ); - } - - if( ssl->out_ctr != NULL ) - { - memset( ssl->out_ctr, 0, SSL_BUFFER_LEN ); - free( ssl->out_ctr ); - } - - if( ssl->in_ctr != NULL ) - { - memset( ssl->in_ctr, 0, SSL_BUFFER_LEN ); - free( ssl->in_ctr ); - } - -#if defined(POLARSSL_DHM_C) - dhm_free( &ssl->dhm_ctx ); -#endif - - if ( ssl->hostname != NULL) - { - memset( ssl->hostname, 0, ssl->hostname_len ); - free( ssl->hostname ); - ssl->hostname_len = 0; - } - - SSL_DEBUG_MSG( 2, ( "<= free" ) ); - - /* Actually free after last debug message */ - memset( ssl, 0, sizeof( ssl_context ) ); -} - -#endif |