From 81db488ebe397ddba4e51e04c0719023ef18cf70 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Sun, 6 May 2012 01:46:56 +0200 Subject: Replace axTLS with PolarSSL as it does not handle secure connections well enough. --- polarssl/src/library/ssl_tls.c | 3166 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 3166 insertions(+) create mode 100644 polarssl/src/library/ssl_tls.c (limited to 'polarssl/src/library/ssl_tls.c') diff --git a/polarssl/src/library/ssl_tls.c b/polarssl/src/library/ssl_tls.c new file mode 100644 index 0000000..88c6e55 --- /dev/null +++ b/polarssl/src/library/ssl_tls.c @@ -0,0 +1,3166 @@ +/* + * 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 + * + * 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 +#include + +#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_(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_(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 -- cgit v1.2.3