Doug Anson
mbed TLS library
Dependents: HTTPClient-SSL WS_SERVER
Diff: polarssl/ssl_tls.c
- Revision:
- 0:137634ff4186
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/polarssl/ssl_tls.c Thu Jun 11 03:27:03 2015 +0000
@@ -0,0 +1,5292 @@
+/*
+ * SSLv3/TLSv1 shared functions
+ *
+ * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ *
+ * 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
+ */
+
+#if !defined(POLARSSL_CONFIG_FILE)
+#include "polarssl/config.h"
+#else
+#include POLARSSL_CONFIG_FILE
+#endif
+
+#if defined(POLARSSL_SSL_TLS_C)
+
+#include "polarssl/debug.h"
+#include "polarssl/ssl.h"
+
+#include <string.h>
+
+#if defined(POLARSSL_X509_CRT_PARSE_C) && \
+ defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
+#include "polarssl/oid.h"
+#endif
+
+#if defined(POLARSSL_PLATFORM_C)
+#include "polarssl/platform.h"
+#else
+#include <stdlib.h>
+#define polarssl_malloc malloc
+#define polarssl_free free
+#endif
+
+#if defined(_MSC_VER) && !defined strcasecmp && !defined(EFIX64) && \
+ !defined(EFI32)
+#define strcasecmp _stricmp
+#endif
+
+/* Implementation that should never be optimized out by the compiler */
+static void polarssl_zeroize( void *v, size_t n ) {
+ volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
+/*
+ * Convert max_fragment_length codes to length.
+ * RFC 6066 says:
+ * enum{
+ * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
+ * } MaxFragmentLength;
+ * and we add 0 -> extension unused
+ */
+static unsigned int mfl_code_to_length[SSL_MAX_FRAG_LEN_INVALID] =
+{
+ SSL_MAX_CONTENT_LEN, /* SSL_MAX_FRAG_LEN_NONE */
+ 512, /* SSL_MAX_FRAG_LEN_512 */
+ 1024, /* SSL_MAX_FRAG_LEN_1024 */
+ 2048, /* SSL_MAX_FRAG_LEN_2048 */
+ 4096, /* SSL_MAX_FRAG_LEN_4096 */
+};
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
+
+static int ssl_session_copy( ssl_session *dst, const ssl_session *src )
+{
+ ssl_session_free( dst );
+ memcpy( dst, src, sizeof( ssl_session ) );
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+ if( src->peer_cert != NULL )
+ {
+ int ret;
+
+ dst->peer_cert = polarssl_malloc( sizeof(x509_crt) );
+ if( dst->peer_cert == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ x509_crt_init( dst->peer_cert );
+
+ if( ( ret = x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
+ src->peer_cert->raw.len ) ) != 0 )
+ {
+ polarssl_free( dst->peer_cert );
+ dst->peer_cert = NULL;
+ return( ret );
+ }
+ }
+#endif /* POLARSSL_X509_CRT_PARSE_C */
+
+#if defined(POLARSSL_SSL_SESSION_TICKETS)
+ if( src->ticket != NULL )
+ {
+ dst->ticket = polarssl_malloc( src->ticket_len );
+ if( dst->ticket == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ memcpy( dst->ticket, src->ticket, src->ticket_len );
+ }
+#endif /* POLARSSL_SSL_SESSION_TICKETS */
+
+ return( 0 );
+}
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+int (*ssl_hw_record_init)( ssl_context *ssl,
+ const unsigned char *key_enc, const unsigned char *key_dec,
+ size_t keylen,
+ const unsigned char *iv_enc, const unsigned char *iv_dec,
+ size_t ivlen,
+ const unsigned char *mac_enc, const unsigned char *mac_dec,
+ size_t maclen ) = NULL;
+int (*ssl_hw_record_activate)( ssl_context *ssl, int direction) = NULL;
+int (*ssl_hw_record_reset)( ssl_context *ssl ) = NULL;
+int (*ssl_hw_record_write)( ssl_context *ssl ) = NULL;
+int (*ssl_hw_record_read)( ssl_context *ssl ) = NULL;
+int (*ssl_hw_record_finish)( ssl_context *ssl ) = NULL;
+#endif /* POLARSSL_SSL_HW_RECORD_ACCEL */
+
+/*
+ * Key material generation
+ */
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+static int ssl3_prf( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ size_t i;
+ md5_context md5;
+ sha1_context sha1;
+ unsigned char padding[16];
+ unsigned char sha1sum[20];
+ ((void)label);
+
+ md5_init( &md5 );
+ sha1_init( &sha1 );
+
+ /*
+ * SSLv3:
+ * block =
+ * MD5( secret + SHA1( 'A' + secret + random ) ) +
+ * MD5( secret + SHA1( 'BB' + secret + random ) ) +
+ * MD5( secret + SHA1( 'CCC' + secret + random ) ) +
+ * ...
+ */
+ for( i = 0; i < dlen / 16; i++ )
+ {
+ memset( padding, (unsigned char) ('A' + i), 1 + i );
+
+ sha1_starts( &sha1 );
+ sha1_update( &sha1, padding, 1 + i );
+ sha1_update( &sha1, secret, slen );
+ sha1_update( &sha1, random, rlen );
+ sha1_finish( &sha1, sha1sum );
+
+ md5_starts( &md5 );
+ md5_update( &md5, secret, slen );
+ md5_update( &md5, sha1sum, 20 );
+ md5_finish( &md5, dstbuf + i * 16 );
+ }
+
+ md5_free( &md5 );
+ sha1_free( &sha1 );
+
+ polarssl_zeroize( padding, sizeof( padding ) );
+ polarssl_zeroize( sha1sum, sizeof( sha1sum ) );
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1)
+static int tls1_prf( const unsigned char *secret, size_t slen,
+ const char *label,
+ const unsigned char *random, size_t rlen,
+ unsigned char *dstbuf, size_t dlen )
+{
+ size_t nb, hs;
+ size_t i, j, k;
+ const 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] );
+ }
+
+ polarssl_zeroize( tmp, sizeof( tmp ) );
+ polarssl_zeroize( h_i, sizeof( h_i ) );
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_PROTO_TLS1) || POLARSSL_SSL_PROTO_TLS1_1 */
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA256_C)
+static int tls_prf_sha256( const unsigned char *secret, size_t slen,
+ const char *label,
+ const 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]
+ */
+ sha256_hmac( secret, slen, tmp + 32, nb, tmp, 0 );
+
+ for( i = 0; i < dlen; i += 32 )
+ {
+ sha256_hmac( secret, slen, tmp, 32 + nb, h_i, 0 );
+ sha256_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];
+ }
+
+ polarssl_zeroize( tmp, sizeof( tmp ) );
+ polarssl_zeroize( h_i, sizeof( h_i ) );
+
+ return( 0 );
+}
+#endif /* POLARSSL_SHA256_C */
+
+#if defined(POLARSSL_SHA512_C)
+static int tls_prf_sha384( const unsigned char *secret, size_t slen,
+ const char *label,
+ const 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]
+ */
+ sha512_hmac( secret, slen, tmp + 48, nb, tmp, 1 );
+
+ for( i = 0; i < dlen; i += 48 )
+ {
+ sha512_hmac( secret, slen, tmp, 48 + nb, h_i, 1 );
+ sha512_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];
+ }
+
+ polarssl_zeroize( tmp, sizeof( tmp ) );
+ polarssl_zeroize( h_i, sizeof( h_i ) );
+
+ return( 0 );
+}
+#endif /* POLARSSL_SHA512_C */
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+
+static void ssl_update_checksum_start( ssl_context *, const unsigned char *, size_t );
+
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_1)
+static void ssl_update_checksum_md5sha1( ssl_context *, const unsigned char *, size_t );
+#endif
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+static void ssl_calc_verify_ssl( ssl_context *, unsigned char * );
+static void ssl_calc_finished_ssl( ssl_context *, unsigned char *, int );
+#endif
+
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1)
+static void ssl_calc_verify_tls( ssl_context *, unsigned char * );
+static void ssl_calc_finished_tls( ssl_context *, unsigned char *, int );
+#endif
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA256_C)
+static void ssl_update_checksum_sha256( ssl_context *, const unsigned char *, size_t );
+static void ssl_calc_verify_tls_sha256( ssl_context *,unsigned char * );
+static void ssl_calc_finished_tls_sha256( ssl_context *,unsigned char *, int );
+#endif
+
+#if defined(POLARSSL_SHA512_C)
+static void ssl_update_checksum_sha384( ssl_context *, const unsigned char *, size_t );
+static void ssl_calc_verify_tls_sha384( ssl_context *, unsigned char * );
+static void ssl_calc_finished_tls_sha384( ssl_context *, unsigned char *, int );
+#endif
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+
+int ssl_derive_keys( ssl_context *ssl )
+{
+ int ret = 0;
+ unsigned char tmp[64];
+ unsigned char keyblk[256];
+ unsigned char *key1;
+ unsigned char *key2;
+ unsigned char *mac_enc;
+ unsigned char *mac_dec;
+ size_t iv_copy_len;
+ const cipher_info_t *cipher_info;
+ const md_info_t *md_info;
+
+ ssl_session *session = ssl->session_negotiate;
+ ssl_transform *transform = ssl->transform_negotiate;
+ ssl_handshake_params *handshake = ssl->handshake;
+
+ SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
+
+ cipher_info = cipher_info_from_type( transform->ciphersuite_info->cipher );
+ if( cipher_info == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "cipher info for %d not found",
+ transform->ciphersuite_info->cipher ) );
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ md_info = md_info_from_type( transform->ciphersuite_info->mac );
+ if( md_info == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "md info for %d not found",
+ transform->ciphersuite_info->mac ) );
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ /*
+ * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions
+ */
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
+ {
+ handshake->tls_prf = ssl3_prf;
+ handshake->calc_verify = ssl_calc_verify_ssl;
+ handshake->calc_finished = ssl_calc_finished_ssl;
+ }
+ else
+#endif
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1)
+ if( ssl->minor_ver < SSL_MINOR_VERSION_3 )
+ {
+ handshake->tls_prf = tls1_prf;
+ handshake->calc_verify = ssl_calc_verify_tls;
+ handshake->calc_finished = ssl_calc_finished_tls;
+ }
+ else
+#endif
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA512_C)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_3 &&
+ transform->ciphersuite_info->mac == POLARSSL_MD_SHA384 )
+ {
+ handshake->tls_prf = tls_prf_sha384;
+ handshake->calc_verify = ssl_calc_verify_tls_sha384;
+ handshake->calc_finished = ssl_calc_finished_tls_sha384;
+ }
+ else
+#endif
+#if defined(POLARSSL_SHA256_C)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
+ {
+ handshake->tls_prf = tls_prf_sha256;
+ handshake->calc_verify = ssl_calc_verify_tls_sha256;
+ handshake->calc_finished = ssl_calc_finished_tls_sha256;
+ }
+ else
+#endif
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /*
+ * 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( handshake->resume == 0 )
+ {
+ SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster,
+ handshake->pmslen );
+
+#if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET)
+ if( ssl->handshake->extended_ms == SSL_EXTENDED_MS_ENABLED )
+ {
+ unsigned char session_hash[48];
+ size_t hash_len;
+
+ SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
+
+ ssl->handshake->calc_verify( ssl, session_hash );
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_3 )
+ {
+#if defined(POLARSSL_SHA512_C)
+ if( ssl->transform_negotiate->ciphersuite_info->mac ==
+ POLARSSL_MD_SHA384 )
+ {
+ hash_len = 48;
+ }
+ else
+#endif
+ hash_len = 32;
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+ hash_len = 36;
+
+ SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
+
+ handshake->tls_prf( handshake->premaster, handshake->pmslen,
+ "extended master secret",
+ session_hash, hash_len, session->master, 48 );
+
+ }
+ else
+#endif
+ handshake->tls_prf( handshake->premaster, handshake->pmslen,
+ "master secret",
+ handshake->randbytes, 64, session->master, 48 );
+
+
+ polarssl_zeroize( handshake->premaster, sizeof(handshake->premaster) );
+ }
+ else
+ SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
+
+ /*
+ * Swap the client and server random values.
+ */
+ memcpy( tmp, handshake->randbytes, 64 );
+ memcpy( handshake->randbytes, tmp + 32, 32 );
+ memcpy( handshake->randbytes + 32, tmp, 32 );
+ polarssl_zeroize( tmp, 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 )
+ */
+ handshake->tls_prf( session->master, 48, "key expansion",
+ handshake->randbytes, 64, keyblk, 256 );
+
+ SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
+ ssl_get_ciphersuite_name( session->ciphersuite ) ) );
+ SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
+ SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 );
+ SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
+
+ polarssl_zeroize( handshake->randbytes, sizeof( handshake->randbytes ) );
+
+ /*
+ * Determine the appropriate key, IV and MAC length.
+ */
+
+ transform->keylen = cipher_info->key_length / 8;
+
+ if( cipher_info->mode == POLARSSL_MODE_GCM ||
+ cipher_info->mode == POLARSSL_MODE_CCM )
+ {
+ transform->maclen = 0;
+
+ transform->ivlen = 12;
+ transform->fixed_ivlen = 4;
+
+ /* Minimum length is expicit IV + tag */
+ transform->minlen = transform->ivlen - transform->fixed_ivlen
+ + ( transform->ciphersuite_info->flags &
+ POLARSSL_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
+ }
+ else
+ {
+ int ret;
+
+ /* Initialize HMAC contexts */
+ if( ( ret = md_init_ctx( &transform->md_ctx_enc, md_info ) ) != 0 ||
+ ( ret = md_init_ctx( &transform->md_ctx_dec, md_info ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "md_init_ctx", ret );
+ return( ret );
+ }
+
+ /* Get MAC length */
+ transform->maclen = md_get_size( md_info );
+
+#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
+ /*
+ * If HMAC is to be truncated, we shall keep the leftmost bytes,
+ * (rfc 6066 page 13 or rfc 2104 section 4),
+ * so we only need to adjust the length here.
+ */
+ if( session->trunc_hmac == SSL_TRUNC_HMAC_ENABLED )
+ transform->maclen = SSL_TRUNCATED_HMAC_LEN;
+#endif /* POLARSSL_SSL_TRUNCATED_HMAC */
+
+ /* IV length */
+ transform->ivlen = cipher_info->iv_size;
+
+ /* Minimum length */
+ if( cipher_info->mode == POLARSSL_MODE_STREAM )
+ transform->minlen = transform->maclen;
+ else
+ {
+ /*
+ * GenericBlockCipher:
+ * 1. if EtM is in use: one block plus MAC
+ * otherwise: * first multiple of blocklen greater than maclen
+ * 2. IV except for SSL3 and TLS 1.0
+ */
+#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
+ if( session->encrypt_then_mac == SSL_ETM_ENABLED )
+ {
+ transform->minlen = transform->maclen
+ + cipher_info->block_size;
+ }
+ else
+#endif
+ {
+ transform->minlen = transform->maclen
+ + cipher_info->block_size
+ - transform->maclen % cipher_info->block_size;
+ }
+
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 ||
+ ssl->minor_ver == SSL_MINOR_VERSION_1 )
+ ; /* No need to adjust minlen */
+ else
+#endif
+#if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_2 ||
+ ssl->minor_ver == SSL_MINOR_VERSION_3 )
+ {
+ transform->minlen += transform->ivlen;
+ }
+ else
+#endif
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ }
+
+ SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
+ transform->keylen, transform->minlen, transform->ivlen,
+ transform->maclen ) );
+
+ /*
+ * Finally setup the cipher contexts, IVs and MAC secrets.
+ */
+#if defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT )
+ {
+ key1 = keyblk + transform->maclen * 2;
+ key2 = keyblk + transform->maclen * 2 + transform->keylen;
+
+ mac_enc = keyblk;
+ mac_dec = keyblk + transform->maclen;
+
+ /*
+ * This is not used in TLS v1.1.
+ */
+ iv_copy_len = ( transform->fixed_ivlen ) ?
+ transform->fixed_ivlen : transform->ivlen;
+ memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len );
+ memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len,
+ iv_copy_len );
+ }
+ else
+#endif /* POLARSSL_SSL_CLI_C */
+#if defined(POLARSSL_SSL_SRV_C)
+ if( ssl->endpoint == SSL_IS_SERVER )
+ {
+ key1 = keyblk + transform->maclen * 2 + transform->keylen;
+ key2 = keyblk + transform->maclen * 2;
+
+ mac_enc = keyblk + transform->maclen;
+ mac_dec = keyblk;
+
+ /*
+ * This is not used in TLS v1.1.
+ */
+ iv_copy_len = ( transform->fixed_ivlen ) ?
+ transform->fixed_ivlen : transform->ivlen;
+ memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len );
+ memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len,
+ iv_copy_len );
+ }
+ else
+#endif /* POLARSSL_SSL_SRV_C */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
+ {
+ if( transform->maclen > sizeof transform->mac_enc )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ memcpy( transform->mac_enc, mac_enc, transform->maclen );
+ memcpy( transform->mac_dec, mac_dec, transform->maclen );
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_1 )
+ {
+ md_hmac_starts( &transform->md_ctx_enc, mac_enc, transform->maclen );
+ md_hmac_starts( &transform->md_ctx_dec, mac_dec, transform->maclen );
+ }
+ else
+#endif
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+ if( ssl_hw_record_init != NULL )
+ {
+ int ret = 0;
+
+ SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_init()" ) );
+
+ if( ( ret = ssl_hw_record_init( ssl, key1, key2, transform->keylen,
+ transform->iv_enc, transform->iv_dec,
+ iv_copy_len,
+ mac_enc, mac_dec,
+ transform->maclen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_hw_record_init", ret );
+ return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif /* POLARSSL_SSL_HW_RECORD_ACCEL */
+
+ if( ( ret = cipher_init_ctx( &transform->cipher_ctx_enc,
+ cipher_info ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_init_ctx", ret );
+ return( ret );
+ }
+
+ if( ( ret = cipher_init_ctx( &transform->cipher_ctx_dec,
+ cipher_info ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_init_ctx", ret );
+ return( ret );
+ }
+
+ if( ( ret = cipher_setkey( &transform->cipher_ctx_enc, key1,
+ cipher_info->key_length,
+ POLARSSL_ENCRYPT ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_setkey", ret );
+ return( ret );
+ }
+
+ if( ( ret = cipher_setkey( &transform->cipher_ctx_dec, key2,
+ cipher_info->key_length,
+ POLARSSL_DECRYPT ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_setkey", ret );
+ return( ret );
+ }
+
+#if defined(POLARSSL_CIPHER_MODE_CBC)
+ if( cipher_info->mode == POLARSSL_MODE_CBC )
+ {
+ if( ( ret = cipher_set_padding_mode( &transform->cipher_ctx_enc,
+ POLARSSL_PADDING_NONE ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_set_padding_mode", ret );
+ return( ret );
+ }
+
+ if( ( ret = cipher_set_padding_mode( &transform->cipher_ctx_dec,
+ POLARSSL_PADDING_NONE ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_set_padding_mode", ret );
+ return( ret );
+ }
+ }
+#endif /* POLARSSL_CIPHER_MODE_CBC */
+
+ polarssl_zeroize( keyblk, sizeof( keyblk ) );
+
+#if defined(POLARSSL_ZLIB_SUPPORT)
+ // Initialize compression
+ //
+ if( session->compression == SSL_COMPRESS_DEFLATE )
+ {
+ if( ssl->compress_buf == NULL )
+ {
+ SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
+ ssl->compress_buf = polarssl_malloc( SSL_BUFFER_LEN );
+ if( ssl->compress_buf == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed",
+ SSL_BUFFER_LEN ) );
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+ }
+ }
+
+ SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
+
+ memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
+ memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
+
+ if( deflateInit( &transform->ctx_deflate,
+ Z_DEFAULT_COMPRESSION ) != Z_OK ||
+ inflateInit( &transform->ctx_inflate ) != Z_OK )
+ {
+ SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
+ return( POLARSSL_ERR_SSL_COMPRESSION_FAILED );
+ }
+ }
+#endif /* POLARSSL_ZLIB_SUPPORT */
+
+ SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
+
+ return( 0 );
+}
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+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 , &ssl->handshake->fin_md5 , sizeof(md5_context) );
+ memcpy( &sha1, &ssl->handshake->fin_sha1, sizeof(sha1_context) );
+
+ memset( pad_1, 0x36, 48 );
+ memset( pad_2, 0x5C, 48 );
+
+ md5_update( &md5, ssl->session_negotiate->master, 48 );
+ md5_update( &md5, pad_1, 48 );
+ md5_finish( &md5, hash );
+
+ md5_starts( &md5 );
+ md5_update( &md5, ssl->session_negotiate->master, 48 );
+ md5_update( &md5, pad_2, 48 );
+ md5_update( &md5, hash, 16 );
+ md5_finish( &md5, hash );
+
+ sha1_update( &sha1, ssl->session_negotiate->master, 48 );
+ sha1_update( &sha1, pad_1, 40 );
+ sha1_finish( &sha1, hash + 16 );
+
+ sha1_starts( &sha1 );
+ sha1_update( &sha1, ssl->session_negotiate->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" ) );
+
+ md5_free( &md5 );
+ sha1_free( &sha1 );
+
+ return;
+}
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1)
+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 , &ssl->handshake->fin_md5 , sizeof(md5_context) );
+ memcpy( &sha1, &ssl->handshake->fin_sha1, 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" ) );
+
+ md5_free( &md5 );
+ sha1_free( &sha1 );
+
+ return;
+}
+#endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 */
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA256_C)
+void ssl_calc_verify_tls_sha256( ssl_context *ssl, unsigned char hash[32] )
+{
+ sha256_context sha256;
+
+ SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
+
+ memcpy( &sha256, &ssl->handshake->fin_sha256, sizeof(sha256_context) );
+ sha256_finish( &sha256, hash );
+
+ SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
+ SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ sha256_free( &sha256 );
+
+ return;
+}
+#endif /* POLARSSL_SHA256_C */
+
+#if defined(POLARSSL_SHA512_C)
+void ssl_calc_verify_tls_sha384( ssl_context *ssl, unsigned char hash[48] )
+{
+ sha512_context sha512;
+
+ SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
+
+ memcpy( &sha512, &ssl->handshake->fin_sha512, sizeof(sha512_context) );
+ sha512_finish( &sha512, hash );
+
+ SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
+ SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
+
+ sha512_free( &sha512 );
+
+ return;
+}
+#endif /* POLARSSL_SHA512_C */
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+
+#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
+int ssl_psk_derive_premaster( ssl_context *ssl, key_exchange_type_t key_ex )
+{
+ unsigned char *p = ssl->handshake->premaster;
+ unsigned char *end = p + sizeof( ssl->handshake->premaster );
+
+ /*
+ * PMS = struct {
+ * opaque other_secret<0..2^16-1>;
+ * opaque psk<0..2^16-1>;
+ * };
+ * with "other_secret" depending on the particular key exchange
+ */
+#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
+ if( key_ex == POLARSSL_KEY_EXCHANGE_PSK )
+ {
+ if( end - p < 2 + (int) ssl->psk_len )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ *(p++) = (unsigned char)( ssl->psk_len >> 8 );
+ *(p++) = (unsigned char)( ssl->psk_len );
+ p += ssl->psk_len;
+ }
+ else
+#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */
+#if defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED)
+ if( key_ex == POLARSSL_KEY_EXCHANGE_RSA_PSK )
+ {
+ /*
+ * other_secret already set by the ClientKeyExchange message,
+ * and is 48 bytes long
+ */
+ *p++ = 0;
+ *p++ = 48;
+ p += 48;
+ }
+ else
+#endif /* POLARSSL_KEY_EXCHANGE_RSA_PKS_ENABLED */
+#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
+ if( key_ex == POLARSSL_KEY_EXCHANGE_DHE_PSK )
+ {
+ int ret;
+ size_t len = end - ( p + 2 );
+
+ /* Write length only when we know the actual value */
+ if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx,
+ p + 2, &len,
+ ssl->f_rng, ssl->p_rng ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
+ return( ret );
+ }
+ *(p++) = (unsigned char)( len >> 8 );
+ *(p++) = (unsigned char)( len );
+ p += len;
+
+ SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
+ }
+ else
+#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
+#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
+ if( key_ex == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
+ {
+ int ret;
+ size_t zlen;
+
+ if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
+ p + 2, end - ( p + 2 ),
+ ssl->f_rng, ssl->p_rng ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret );
+ return( ret );
+ }
+
+ *(p++) = (unsigned char)( zlen >> 8 );
+ *(p++) = (unsigned char)( zlen );
+ p += zlen;
+
+ SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
+ }
+ else
+#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /* opaque psk<0..2^16-1>; */
+ if( end - p < 2 + (int) ssl->psk_len )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ *(p++) = (unsigned char)( ssl->psk_len >> 8 );
+ *(p++) = (unsigned char)( ssl->psk_len );
+ memcpy( p, ssl->psk, ssl->psk_len );
+ p += ssl->psk_len;
+
+ ssl->handshake->pmslen = p - ssl->handshake->premaster;
+
+ return( 0 );
+}
+#endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+/*
+ * SSLv3.0 MAC functions
+ */
+static void ssl_mac( md_context_t *md_ctx, unsigned char *secret,
+ unsigned char *buf, size_t len,
+ unsigned char *ctr, int type )
+{
+ unsigned char header[11];
+ unsigned char padding[48];
+ int padlen;
+ int md_size = md_get_size( md_ctx->md_info );
+ int md_type = md_get_type( md_ctx->md_info );
+
+ /* Only MD5 and SHA-1 supported */
+ if( md_type == POLARSSL_MD_MD5 )
+ padlen = 48;
+ else
+ padlen = 40;
+
+ memcpy( header, ctr, 8 );
+ header[ 8] = (unsigned char) type;
+ header[ 9] = (unsigned char)( len >> 8 );
+ header[10] = (unsigned char)( len );
+
+ memset( padding, 0x36, padlen );
+ md_starts( md_ctx );
+ md_update( md_ctx, secret, md_size );
+ md_update( md_ctx, padding, padlen );
+ md_update( md_ctx, header, 11 );
+ md_update( md_ctx, buf, len );
+ md_finish( md_ctx, buf + len );
+
+ memset( padding, 0x5C, padlen );
+ md_starts( md_ctx );
+ md_update( md_ctx, secret, md_size );
+ md_update( md_ctx, padding, padlen );
+ md_update( md_ctx, buf + len, md_size );
+ md_finish( md_ctx, buf + len );
+}
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+
+#if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER) || \
+ ( defined(POLARSSL_CIPHER_MODE_CBC) && \
+ ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) ) )
+#define POLARSSL_SOME_MODES_USE_MAC
+#endif
+
+/*
+ * Encryption/decryption functions
+ */
+static int ssl_encrypt_buf( ssl_context *ssl )
+{
+ size_t i;
+ cipher_mode_t mode;
+ int auth_done = 0;
+
+ SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
+
+ if( ssl->session_out == NULL || ssl->transform_out == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ mode = cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc );
+
+ SSL_DEBUG_BUF( 4, "before encrypt: output payload",
+ ssl->out_msg, ssl->out_msglen );
+
+ /*
+ * Add MAC before if needed
+ */
+#if defined(POLARSSL_SOME_MODES_USE_MAC)
+ if( mode == POLARSSL_MODE_STREAM ||
+ ( mode == POLARSSL_MODE_CBC
+#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
+ && ssl->session_out->encrypt_then_mac == SSL_ETM_DISABLED
+#endif
+ ) )
+ {
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
+ {
+ ssl_mac( &ssl->transform_out->md_ctx_enc,
+ ssl->transform_out->mac_enc,
+ ssl->out_msg, ssl->out_msglen,
+ ssl->out_ctr, ssl->out_msgtype );
+ }
+ else
+#endif
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_1 )
+ {
+ md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 13 );
+ md_hmac_update( &ssl->transform_out->md_ctx_enc,
+ ssl->out_msg, ssl->out_msglen );
+ md_hmac_finish( &ssl->transform_out->md_ctx_enc,
+ ssl->out_msg + ssl->out_msglen );
+ md_hmac_reset( &ssl->transform_out->md_ctx_enc );
+ }
+ else
+#endif
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ SSL_DEBUG_BUF( 4, "computed mac",
+ ssl->out_msg + ssl->out_msglen,
+ ssl->transform_out->maclen );
+
+ ssl->out_msglen += ssl->transform_out->maclen;
+ auth_done++;
+ }
+#endif /* AEAD not the only option */
+
+ /*
+ * Encrypt
+ */
+#if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER)
+ if( mode == POLARSSL_MODE_STREAM )
+ {
+ int ret;
+ size_t olen = 0;
+
+ SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
+ "including %d bytes of padding",
+ ssl->out_msglen, 0 ) );
+
+ if( ( ret = cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
+ ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen,
+ ssl->out_msg, ssl->out_msglen,
+ ssl->out_msg, &olen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( ssl->out_msglen != olen )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ else
+#endif /* POLARSSL_ARC4_C || POLARSSL_CIPHER_NULL_CIPHER */
+#if defined(POLARSSL_GCM_C) || defined(POLARSSL_CCM_C)
+ if( mode == POLARSSL_MODE_GCM ||
+ mode == POLARSSL_MODE_CCM )
+ {
+ int ret;
+ size_t enc_msglen, olen;
+ unsigned char *enc_msg;
+ unsigned char add_data[13];
+ unsigned char taglen = ssl->transform_out->ciphersuite_info->flags &
+ POLARSSL_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+
+ 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 );
+
+ /*
+ * Generate IV
+ */
+#if defined(POLARSSL_SSL_AEAD_RANDOM_IV)
+ ret = ssl->f_rng( ssl->p_rng,
+ ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
+ ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
+ if( ret != 0 )
+ return( ret );
+
+ memcpy( ssl->out_iv,
+ ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
+ ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
+#else
+ if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 )
+ {
+ /* Reminder if we ever add an AEAD mode with a different size */
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
+ ssl->out_ctr, 8 );
+ memcpy( ssl->out_iv, ssl->out_ctr, 8 );
+#endif
+
+ SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv,
+ ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
+
+ /*
+ * Fix pointer positions and message length with added IV
+ */
+ enc_msg = ssl->out_msg;
+ enc_msglen = ssl->out_msglen;
+ ssl->out_msglen += ssl->transform_out->ivlen -
+ ssl->transform_out->fixed_ivlen;
+
+ SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
+ "including %d bytes of padding",
+ ssl->out_msglen, 0 ) );
+
+ /*
+ * Encrypt and authenticate
+ */
+ if( ( ret = cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc,
+ ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen,
+ add_data, 13,
+ enc_msg, enc_msglen,
+ enc_msg, &olen,
+ enc_msg + enc_msglen, taglen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_auth_encrypt", ret );
+ return( ret );
+ }
+
+ if( olen != enc_msglen )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ ssl->out_msglen += taglen;
+ auth_done++;
+
+ SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen );
+ }
+ else
+#endif /* POLARSSL_GCM_C || POLARSSL_CCM_C */
+#if defined(POLARSSL_CIPHER_MODE_CBC) && \
+ ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) )
+ if( mode == POLARSSL_MODE_CBC )
+ {
+ int ret;
+ unsigned char *enc_msg;
+ size_t enc_msglen, padlen, olen = 0;
+
+ padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
+ ssl->transform_out->ivlen;
+ if( padlen == ssl->transform_out->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;
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2)
+ /*
+ * 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->transform_out->iv_enc,
+ ssl->transform_out->ivlen );
+ if( ret != 0 )
+ return( ret );
+
+ memcpy( ssl->out_iv, ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen );
+
+ /*
+ * Fix pointer positions and message length with added IV
+ */
+ enc_msg = ssl->out_msg;
+ enc_msglen = ssl->out_msglen;
+ ssl->out_msglen += ssl->transform_out->ivlen;
+ }
+#endif /* POLARSSL_SSL_PROTO_TLS1_1 || POLARSSL_SSL_PROTO_TLS1_2 */
+
+ SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
+ "including %d bytes of IV and %d bytes of padding",
+ ssl->out_msglen, ssl->transform_out->ivlen,
+ padlen + 1 ) );
+
+ if( ( ret = cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
+ ssl->transform_out->iv_enc,
+ ssl->transform_out->ivlen,
+ enc_msg, enc_msglen,
+ enc_msg, &olen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( enc_msglen != olen )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1)
+ if( ssl->minor_ver < SSL_MINOR_VERSION_2 )
+ {
+ /*
+ * Save IV in SSL3 and TLS1
+ */
+ memcpy( ssl->transform_out->iv_enc,
+ ssl->transform_out->cipher_ctx_enc.iv,
+ ssl->transform_out->ivlen );
+ }
+#endif
+
+#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
+ if( auth_done == 0 )
+ {
+ /*
+ * MAC(MAC_write_key, seq_num +
+ * TLSCipherText.type +
+ * TLSCipherText.version +
+ * length_of( (IV +) ENC(...) ) +
+ * IV + // except for TLS 1.0
+ * ENC(content + padding + padding_length));
+ */
+ unsigned char pseudo_hdr[13];
+
+ SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
+
+ memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 );
+ memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 );
+ pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF );
+ pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF );
+
+ SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
+
+ md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 );
+ md_hmac_update( &ssl->transform_out->md_ctx_enc,
+ ssl->out_iv, ssl->out_msglen );
+ md_hmac_finish( &ssl->transform_out->md_ctx_enc,
+ ssl->out_iv + ssl->out_msglen );
+ md_hmac_reset( &ssl->transform_out->md_ctx_enc );
+
+ ssl->out_msglen += ssl->transform_out->maclen;
+ auth_done++;
+ }
+#endif /* POLARSSL_SSL_ENCRYPT_THEN_MAC */
+ }
+ else
+#endif /* POLARSSL_CIPHER_MODE_CBC &&
+ ( POLARSSL_AES_C || POLARSSL_CAMELLIA_C ) */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ /* Make extra sure authentication was performed, exactly once */
+ if( auth_done != 1 )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ for( i = 8; i > 0; i-- )
+ if( ++ssl->out_ctr[i - 1] != 0 )
+ break;
+
+ /* The loops goes to its end iff the counter is wrapping */
+ if( i == 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
+ return( POLARSSL_ERR_SSL_COUNTER_WRAPPING );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
+
+ return( 0 );
+}
+
+#define POLARSSL_SSL_MAX_MAC_SIZE 48
+
+static int ssl_decrypt_buf( ssl_context *ssl )
+{
+ size_t i;
+ cipher_mode_t mode;
+ int auth_done = 0;
+#if defined(POLARSSL_SOME_MODES_USE_MAC)
+ size_t padlen = 0, correct = 1;
+#endif
+
+ SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
+
+ if( ssl->session_in == NULL || ssl->transform_in == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ mode = cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec );
+
+ if( ssl->in_msglen < ssl->transform_in->minlen )
+ {
+ SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
+ ssl->in_msglen, ssl->transform_in->minlen ) );
+ return( POLARSSL_ERR_SSL_INVALID_MAC );
+ }
+
+#if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER)
+ if( mode == POLARSSL_MODE_STREAM )
+ {
+ int ret;
+ size_t olen = 0;
+
+ padlen = 0;
+
+ if( ( ret = cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
+ ssl->transform_in->iv_dec,
+ ssl->transform_in->ivlen,
+ ssl->in_msg, ssl->in_msglen,
+ ssl->in_msg, &olen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( ssl->in_msglen != olen )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ else
+#endif /* POLARSSL_ARC4_C || POLARSSL_CIPHER_NULL_CIPHER */
+#if defined(POLARSSL_GCM_C) || defined(POLARSSL_CCM_C)
+ if( mode == POLARSSL_MODE_GCM ||
+ mode == POLARSSL_MODE_CCM )
+ {
+ int ret;
+ size_t dec_msglen, olen;
+ unsigned char *dec_msg;
+ unsigned char *dec_msg_result;
+ unsigned char add_data[13];
+ unsigned char taglen = ssl->transform_in->ciphersuite_info->flags &
+ POLARSSL_CIPHERSUITE_SHORT_TAG ? 8 : 16;
+ unsigned char explicit_iv_len = ssl->transform_in->ivlen -
+ ssl->transform_in->fixed_ivlen;
+
+ if( ssl->in_msglen < (size_t) explicit_iv_len + taglen )
+ {
+ SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
+ "+ taglen (%d)", ssl->in_msglen,
+ explicit_iv_len, taglen ) );
+ return( POLARSSL_ERR_SSL_INVALID_MAC );
+ }
+ dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
+
+ dec_msg = ssl->in_msg;
+ 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->transform_in->iv_dec + ssl->transform_in->fixed_ivlen,
+ ssl->in_iv,
+ ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen );
+
+ SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec,
+ ssl->transform_in->ivlen );
+ SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
+
+ /*
+ * Decrypt and authenticate
+ */
+ if( ( ret = cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
+ ssl->transform_in->iv_dec,
+ ssl->transform_in->ivlen,
+ add_data, 13,
+ dec_msg, dec_msglen,
+ dec_msg_result, &olen,
+ dec_msg + dec_msglen, taglen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_auth_decrypt", ret );
+
+ if( ret == POLARSSL_ERR_CIPHER_AUTH_FAILED )
+ return( POLARSSL_ERR_SSL_INVALID_MAC );
+
+ return( ret );
+ }
+ auth_done++;
+
+ if( olen != dec_msglen )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ else
+#endif /* POLARSSL_GCM_C || POLARSSL_CCM_C */
+#if defined(POLARSSL_CIPHER_MODE_CBC) && \
+ ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) )
+ if( mode == POLARSSL_MODE_CBC )
+ {
+ /*
+ * Decrypt and check the padding
+ */
+ int ret;
+ unsigned char *dec_msg;
+ unsigned char *dec_msg_result;
+ size_t dec_msglen;
+ size_t minlen = 0;
+ size_t olen = 0;
+
+ /*
+ * Check immediate ciphertext sanity
+ */
+#if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_2 )
+ minlen += ssl->transform_in->ivlen;
+#endif
+
+ if( ssl->in_msglen < minlen + ssl->transform_in->ivlen ||
+ ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 )
+ {
+ SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) "
+ "+ 1 ) ( + expl IV )", ssl->in_msglen,
+ ssl->transform_in->ivlen,
+ ssl->transform_in->maclen ) );
+ return( POLARSSL_ERR_SSL_INVALID_MAC );
+ }
+
+ dec_msglen = ssl->in_msglen;
+ dec_msg = ssl->in_msg;
+ dec_msg_result = ssl->in_msg;
+
+ /*
+ * Authenticate before decrypt if enabled
+ */
+#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
+ if( ssl->session_in->encrypt_then_mac == SSL_ETM_ENABLED )
+ {
+ unsigned char computed_mac[POLARSSL_SSL_MAX_MAC_SIZE];
+ unsigned char pseudo_hdr[13];
+
+ SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
+
+ dec_msglen -= ssl->transform_in->maclen;
+ ssl->in_msglen -= ssl->transform_in->maclen;
+
+ memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 );
+ memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 );
+ pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF );
+ pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF );
+
+ SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
+
+ md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 );
+ md_hmac_update( &ssl->transform_in->md_ctx_dec,
+ ssl->in_iv, ssl->in_msglen );
+ md_hmac_finish( &ssl->transform_in->md_ctx_dec, computed_mac );
+ md_hmac_reset( &ssl->transform_in->md_ctx_dec );
+
+ SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen,
+ ssl->transform_in->maclen );
+ SSL_DEBUG_BUF( 4, "computed mac", computed_mac,
+ ssl->transform_in->maclen );
+
+ if( safer_memcmp( ssl->in_iv + ssl->in_msglen, computed_mac,
+ ssl->transform_in->maclen ) != 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
+
+ return( POLARSSL_ERR_SSL_INVALID_MAC );
+ }
+ auth_done++;
+ }
+#endif /* POLARSSL_SSL_ENCRYPT_THEN_MAC */
+
+ /*
+ * Check length sanity
+ */
+ if( ssl->in_msglen % ssl->transform_in->ivlen != 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
+ ssl->in_msglen, ssl->transform_in->ivlen ) );
+ return( POLARSSL_ERR_SSL_INVALID_MAC );
+ }
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2)
+ /*
+ * Initialize for prepended IV for block cipher in TLS v1.1 and up
+ */
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_2 )
+ {
+ dec_msglen -= ssl->transform_in->ivlen;
+ ssl->in_msglen -= ssl->transform_in->ivlen;
+
+ for( i = 0; i < ssl->transform_in->ivlen; i++ )
+ ssl->transform_in->iv_dec[i] = ssl->in_iv[i];
+ }
+#endif /* POLARSSL_SSL_PROTO_TLS1_1 || POLARSSL_SSL_PROTO_TLS1_2 */
+
+ if( ( ret = cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
+ ssl->transform_in->iv_dec,
+ ssl->transform_in->ivlen,
+ dec_msg, dec_msglen,
+ dec_msg_result, &olen ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "cipher_crypt", ret );
+ return( ret );
+ }
+
+ if( dec_msglen != olen )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1)
+ if( ssl->minor_ver < SSL_MINOR_VERSION_2 )
+ {
+ /*
+ * Save IV in SSL3 and TLS1
+ */
+ memcpy( ssl->transform_in->iv_dec,
+ ssl->transform_in->cipher_ctx_dec.iv,
+ ssl->transform_in->ivlen );
+ }
+#endif
+
+ padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
+
+ if( ssl->in_msglen < ssl->transform_in->maclen + padlen &&
+ auth_done == 0 )
+ {
+#if defined(POLARSSL_SSL_DEBUG_ALL)
+ SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
+ ssl->in_msglen, ssl->transform_in->maclen, padlen ) );
+#endif
+ padlen = 0;
+ correct = 0;
+ }
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
+ {
+ if( padlen > ssl->transform_in->ivlen )
+ {
+#if defined(POLARSSL_SSL_DEBUG_ALL)
+ SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
+ "should be no more than %d",
+ padlen, ssl->transform_in->ivlen ) );
+#endif
+ correct = 0;
+ }
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver > SSL_MINOR_VERSION_0 )
+ {
+ /*
+ * TLSv1+: always check the padding up to the first failure
+ * and fake check up to 256 bytes of padding
+ */
+ size_t pad_count = 0, real_count = 1;
+ size_t padding_idx = ssl->in_msglen - padlen - 1;
+
+ /*
+ * Padding is guaranteed to be incorrect if:
+ * 1. padlen >= ssl->in_msglen
+ *
+ * 2. padding_idx >= SSL_MAX_CONTENT_LEN +
+ * ssl->transform_in->maclen
+ *
+ * In both cases we reset padding_idx to a safe value (0) to
+ * prevent out-of-buffer reads.
+ */
+ correct &= ( ssl->in_msglen >= padlen + 1 );
+ correct &= ( padding_idx < SSL_MAX_CONTENT_LEN +
+ ssl->transform_in->maclen );
+
+ padding_idx *= correct;
+
+ for( i = 1; i <= 256; i++ )
+ {
+ real_count &= ( i <= padlen );
+ pad_count += real_count *
+ ( ssl->in_msg[padding_idx + i] == padlen - 1 );
+ }
+
+ correct &= ( pad_count == padlen ); /* Only 1 on correct padding */
+
+#if defined(POLARSSL_SSL_DEBUG_ALL)
+ if( padlen > 0 && correct == 0 )
+ SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
+#endif
+ padlen &= correct * 0x1FF;
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 || \
+ POLARSSL_SSL_PROTO_TLS1_2 */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ ssl->in_msglen -= padlen;
+ }
+ else
+#endif /* POLARSSL_CIPHER_MODE_CBC &&
+ ( POLARSSL_AES_C || POLARSSL_CAMELLIA_C ) */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ SSL_DEBUG_BUF( 4, "raw buffer after decryption",
+ ssl->in_msg, ssl->in_msglen );
+
+ /*
+ * Authenticate if not done yet.
+ * Compute the MAC regardless of the padding result (RFC4346, CBCTIME).
+ */
+#if defined(POLARSSL_SOME_MODES_USE_MAC)
+ if( auth_done == 0 )
+ {
+ unsigned char tmp[POLARSSL_SSL_MAX_MAC_SIZE];
+
+ ssl->in_msglen -= ssl->transform_in->maclen;
+
+ 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, ssl->transform_in->maclen );
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
+ {
+ ssl_mac( &ssl->transform_in->md_ctx_dec,
+ ssl->transform_in->mac_dec,
+ ssl->in_msg, ssl->in_msglen,
+ ssl->in_ctr, ssl->in_msgtype );
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver > SSL_MINOR_VERSION_0 )
+ {
+ /*
+ * Process MAC and always update for padlen afterwards to make
+ * total time independent of padlen
+ *
+ * extra_run compensates MAC check for padlen
+ *
+ * Known timing attacks:
+ * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf)
+ *
+ * We use ( ( Lx + 8 ) / 64 ) to handle 'negative Lx' values
+ * correctly. (We round down instead of up, so -56 is the correct
+ * value for our calculations instead of -55)
+ */
+ size_t j, extra_run = 0;
+ extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 -
+ ( 13 + ssl->in_msglen + 8 ) / 64;
+
+ extra_run &= correct * 0xFF;
+
+ md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 13 );
+ md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg,
+ ssl->in_msglen );
+ md_hmac_finish( &ssl->transform_in->md_ctx_dec,
+ ssl->in_msg + ssl->in_msglen );
+ /* Call md_process at least once due to cache attacks */
+ for( j = 0; j < extra_run + 1; j++ )
+ md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg );
+
+ md_hmac_reset( &ssl->transform_in->md_ctx_dec );
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 || \
+ POLARSSL_SSL_PROTO_TLS1_2 */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ SSL_DEBUG_BUF( 4, "message mac", tmp, ssl->transform_in->maclen );
+ SSL_DEBUG_BUF( 4, "computed mac", ssl->in_msg + ssl->in_msglen,
+ ssl->transform_in->maclen );
+
+ if( safer_memcmp( tmp, ssl->in_msg + ssl->in_msglen,
+ ssl->transform_in->maclen ) != 0 )
+ {
+#if defined(POLARSSL_SSL_DEBUG_ALL)
+ SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
+#endif
+ correct = 0;
+ }
+ auth_done++;
+
+ /*
+ * Finally check the correct flag
+ */
+ if( correct == 0 )
+ return( POLARSSL_ERR_SSL_INVALID_MAC );
+ }
+#endif /* POLARSSL_SOME_MODES_USE_MAC */
+
+ /* Make extra sure authentication was performed, exactly once */
+ if( auth_done != 1 )
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+
+ 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;
+
+ /* The loops goes to its end iff the counter is wrapping */
+ if( i == 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
+ return( POLARSSL_ERR_SSL_COUNTER_WRAPPING );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
+
+ return( 0 );
+}
+
+#undef MAC_NONE
+#undef MAC_PLAINTEXT
+#undef MAC_CIPHERTEXT
+
+#if defined(POLARSSL_ZLIB_SUPPORT)
+/*
+ * Compression/decompression functions
+ */
+static int ssl_compress_buf( ssl_context *ssl )
+{
+ int ret;
+ unsigned char *msg_post = ssl->out_msg;
+ size_t len_pre = ssl->out_msglen;
+ unsigned char *msg_pre = ssl->compress_buf;
+
+ SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
+
+ if( len_pre == 0 )
+ return( 0 );
+
+ memcpy( msg_pre, ssl->out_msg, len_pre );
+
+ SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
+ ssl->out_msglen ) );
+
+ SSL_DEBUG_BUF( 4, "before compression: output payload",
+ ssl->out_msg, ssl->out_msglen );
+
+ ssl->transform_out->ctx_deflate.next_in = msg_pre;
+ ssl->transform_out->ctx_deflate.avail_in = len_pre;
+ ssl->transform_out->ctx_deflate.next_out = msg_post;
+ ssl->transform_out->ctx_deflate.avail_out = SSL_BUFFER_LEN;
+
+ ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
+ if( ret != Z_OK )
+ {
+ SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) );
+ return( POLARSSL_ERR_SSL_COMPRESSION_FAILED );
+ }
+
+ ssl->out_msglen = SSL_BUFFER_LEN -
+ ssl->transform_out->ctx_deflate.avail_out;
+
+ SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
+ ssl->out_msglen ) );
+
+ SSL_DEBUG_BUF( 4, "after compression: output payload",
+ ssl->out_msg, ssl->out_msglen );
+
+ SSL_DEBUG_MSG( 2, ( "<= compress buf" ) );
+
+ return( 0 );
+}
+
+static int ssl_decompress_buf( ssl_context *ssl )
+{
+ int ret;
+ unsigned char *msg_post = ssl->in_msg;
+ size_t len_pre = ssl->in_msglen;
+ unsigned char *msg_pre = ssl->compress_buf;
+
+ SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
+
+ if( len_pre == 0 )
+ return( 0 );
+
+ memcpy( msg_pre, ssl->in_msg, len_pre );
+
+ SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
+ ssl->in_msglen ) );
+
+ SSL_DEBUG_BUF( 4, "before decompression: input payload",
+ ssl->in_msg, ssl->in_msglen );
+
+ ssl->transform_in->ctx_inflate.next_in = msg_pre;
+ ssl->transform_in->ctx_inflate.avail_in = len_pre;
+ ssl->transform_in->ctx_inflate.next_out = msg_post;
+ ssl->transform_in->ctx_inflate.avail_out = SSL_MAX_CONTENT_LEN;
+
+ ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
+ if( ret != Z_OK )
+ {
+ SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) );
+ return( POLARSSL_ERR_SSL_COMPRESSION_FAILED );
+ }
+
+ ssl->in_msglen = SSL_MAX_CONTENT_LEN -
+ ssl->transform_in->ctx_inflate.avail_out;
+
+ SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
+ ssl->in_msglen ) );
+
+ SSL_DEBUG_BUF( 4, "after decompression: input payload",
+ ssl->in_msg, ssl->in_msglen );
+
+ SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) );
+
+ return( 0 );
+}
+#endif /* POLARSSL_ZLIB_SUPPORT */
+
+/*
+ * 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" ) );
+
+ if( nb_want > SSL_BUFFER_LEN - 8 )
+ {
+ SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ 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, done = 0;
+ size_t len = ssl->out_msglen;
+
+ SSL_DEBUG_MSG( 2, ( "=> write record" ) );
+
+ 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 ) );
+
+ if( ssl->out_msg[0] != SSL_HS_HELLO_REQUEST )
+ ssl->handshake->update_checksum( ssl, ssl->out_msg, len );
+ }
+
+#if defined(POLARSSL_ZLIB_SUPPORT)
+ if( ssl->transform_out != NULL &&
+ ssl->session_out->compression == SSL_COMPRESS_DEFLATE )
+ {
+ if( ( ret = ssl_compress_buf( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_compress_buf", ret );
+ return( ret );
+ }
+
+ len = ssl->out_msglen;
+ }
+#endif /*POLARSSL_ZLIB_SUPPORT */
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+ if( ssl_hw_record_write != NULL )
+ {
+ SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_write()" ) );
+
+ ret = ssl_hw_record_write( ssl );
+ if( ret != 0 && ret != POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH )
+ {
+ SSL_DEBUG_RET( 1, "ssl_hw_record_write", ret );
+ return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ if( ret == 0 )
+ done = 1;
+ }
+#endif /* POLARSSL_SSL_HW_RECORD_ACCEL */
+ if( !done )
+ {
+ 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->transform_out != NULL )
+ {
+ 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, done = 0;
+
+ 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 );
+ }
+
+ if( ssl->state != SSL_HANDSHAKE_OVER )
+ ssl->handshake->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 );
+ }
+
+ /* Sanity check (outer boundaries) */
+ if( ssl->in_msglen < 1 || ssl->in_msglen > SSL_BUFFER_LEN - 13 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( POLARSSL_ERR_SSL_INVALID_RECORD );
+ }
+
+ /*
+ * Make sure the message length is acceptable for the current transform
+ * and protocol version.
+ */
+ if( ssl->transform_in == NULL )
+ {
+ if( 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->transform_in->minlen )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( POLARSSL_ERR_SSL_INVALID_RECORD );
+ }
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 &&
+ ssl->in_msglen > ssl->transform_in->minlen + SSL_MAX_CONTENT_LEN )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( POLARSSL_ERR_SSL_INVALID_RECORD );
+ }
+#endif
+
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_2)
+ /*
+ * TLS encrypted messages can have up to 256 bytes of padding
+ */
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_1 &&
+ ssl->in_msglen > ssl->transform_in->minlen +
+ SSL_MAX_CONTENT_LEN + 256 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad message length" ) );
+ return( POLARSSL_ERR_SSL_INVALID_RECORD );
+ }
+#endif
+ }
+
+ /*
+ * 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 defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+ if( ssl_hw_record_read != NULL )
+ {
+ SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_read()" ) );
+
+ ret = ssl_hw_record_read( ssl );
+ if( ret != 0 && ret != POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH )
+ {
+ SSL_DEBUG_RET( 1, "ssl_hw_record_read", ret );
+ return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED );
+ }
+
+ if( ret == 0 )
+ done = 1;
+ }
+#endif /* POLARSSL_SSL_HW_RECORD_ACCEL */
+ if( !done && ssl->transform_in != NULL )
+ {
+ if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
+ {
+#if defined(POLARSSL_SSL_ALERT_MESSAGES)
+ if( ret == POLARSSL_ERR_SSL_INVALID_MAC )
+ {
+ ssl_send_alert_message( ssl,
+ SSL_ALERT_LEVEL_FATAL,
+ SSL_ALERT_MSG_BAD_RECORD_MAC );
+ }
+#endif
+ 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 defined(POLARSSL_ZLIB_SUPPORT)
+ if( ssl->transform_in != NULL &&
+ ssl->session_in->compression == SSL_COMPRESS_DEFLATE )
+ {
+ if( ( ret = ssl_decompress_buf( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret );
+ return( ret );
+ }
+
+ ssl->in_hdr[3] = (unsigned char)( ssl->in_msglen >> 8 );
+ ssl->in_hdr[4] = (unsigned char)( ssl->in_msglen );
+ }
+#endif /* POLARSSL_ZLIB_SUPPORT */
+
+ 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 );
+ }
+
+ if( ssl->state != SSL_HANDSHAKE_OVER )
+ ssl->handshake->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 (msg %d)",
+ ssl->in_msg[1] ) );
+ return( POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE );
+ }
+
+ 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_fatal_handshake_failure( ssl_context *ssl )
+{
+ int ret;
+
+ if( ( ret = ssl_send_alert_message( ssl,
+ SSL_ALERT_LEVEL_FATAL,
+ SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 )
+ {
+ return( ret );
+ }
+
+ 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
+ */
+#if !defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) && \
+ !defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED) && \
+ !defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
+ !defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
+ !defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \
+ !defined(POLARSSL_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
+ !defined(POLARSSL_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
+int ssl_write_certificate( ssl_context *ssl )
+{
+ const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
+
+ SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
+
+ if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+}
+
+int ssl_parse_certificate( ssl_context *ssl )
+{
+ const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
+
+ SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
+
+ if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+}
+#else
+int ssl_write_certificate( ssl_context *ssl )
+{
+ int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
+ size_t i, n;
+ const x509_crt *crt;
+ const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
+
+ SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
+
+ if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT )
+ {
+ if( ssl->client_auth == 0 )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ /*
+ * If using SSLv3 and got no cert, send an Alert message
+ * (otherwise an empty Certificate message will be sent).
+ */
+ if( ssl_own_cert( ssl ) == 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;
+ }
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+ }
+#endif /* POLARSSL_SSL_CLI_C */
+#if defined(POLARSSL_SSL_SRV_C)
+ if( ssl->endpoint == SSL_IS_SERVER )
+ {
+ if( ssl_own_cert( ssl ) == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
+ return( POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED );
+ }
+ }
+#endif
+
+ SSL_DEBUG_CRT( 3, "own certificate", ssl_own_cert( ssl ) );
+
+ /*
+ * 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( ssl );
+
+ while( crt != NULL )
+ {
+ n = crt->raw.len;
+ if( n > SSL_MAX_CONTENT_LEN - 3 - i )
+ {
+ 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;
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+write_msg:
+#endif
+
+ 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( ret );
+}
+
+int ssl_parse_certificate( ssl_context *ssl )
+{
+ int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
+ size_t i, n;
+ const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
+
+ SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
+
+ if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
+ {
+ SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+
+#if defined(POLARSSL_SSL_SRV_C)
+ if( ssl->endpoint == SSL_IS_SERVER &&
+ ( ssl->authmode == SSL_VERIFY_NONE ||
+ ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA_PSK ) )
+ {
+ ssl->session_negotiate->verify_result = BADCERT_SKIP_VERIFY;
+ SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
+ ssl->state++;
+ return( 0 );
+ }
+#endif
+
+ if( ( ret = ssl_read_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_read_record", ret );
+ return( ret );
+ }
+
+ ssl->state++;
+
+#if defined(POLARSSL_SSL_SRV_C)
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ /*
+ * 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->session_negotiate->verify_result = BADCERT_MISSING;
+ if( ssl->authmode == SSL_VERIFY_OPTIONAL )
+ return( 0 );
+ else
+ return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE );
+ }
+ }
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_2)
+ 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->session_negotiate->verify_result = BADCERT_MISSING;
+ if( ssl->authmode == SSL_VERIFY_REQUIRED )
+ return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE );
+ else
+ return( 0 );
+ }
+ }
+#endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 || \
+ POLARSSL_SSL_PROTO_TLS1_2 */
+#endif /* POLARSSL_SSL_SRV_C */
+
+ 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 );
+ }
+
+ /* In case we tried to reuse a session but it failed */
+ if( ssl->session_negotiate->peer_cert != NULL )
+ {
+ x509_crt_free( ssl->session_negotiate->peer_cert );
+ polarssl_free( ssl->session_negotiate->peer_cert );
+ }
+
+ if( ( ssl->session_negotiate->peer_cert = polarssl_malloc(
+ sizeof( x509_crt ) ) ) == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed",
+ sizeof( x509_crt ) ) );
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+ }
+
+ x509_crt_init( ssl->session_negotiate->peer_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 = x509_crt_parse_der( ssl->session_negotiate->peer_cert,
+ ssl->in_msg + i, n );
+ if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, " x509_crt_parse_der", ret );
+ return( ret );
+ }
+
+ i += n;
+ }
+
+ SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert );
+
+ /*
+ * On client, make sure the server cert doesn't change during renego to
+ * avoid "triple handshake" attack: https://secure-resumption.com/
+ */
+#if defined(POLARSSL_SSL_RENEGOTIATION) && defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT &&
+ ssl->renegotiation == SSL_RENEGOTIATION )
+ {
+ if( ssl->session->peer_cert == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+
+ if( ssl->session->peer_cert->raw.len !=
+ ssl->session_negotiate->peer_cert->raw.len ||
+ memcmp( ssl->session->peer_cert->raw.p,
+ ssl->session_negotiate->peer_cert->raw.p,
+ ssl->session->peer_cert->raw.len ) != 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE );
+ }
+ }
+#endif /* POLARSSL_SSL_RENEGOTIATION && POLARSSL_SSL_CLI_C */
+
+ 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 );
+ }
+
+ /*
+ * Main check: verify certificate
+ */
+ ret = x509_crt_verify( ssl->session_negotiate->peer_cert,
+ ssl->ca_chain, ssl->ca_crl, ssl->peer_cn,
+ &ssl->session_negotiate->verify_result,
+ ssl->f_vrfy, ssl->p_vrfy );
+
+ if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
+ }
+
+ /*
+ * Secondary checks: always done, but change 'ret' only if it was 0
+ */
+
+#if defined(POLARSSL_SSL_SET_CURVES)
+ {
+ pk_context *pk = &ssl->session_negotiate->peer_cert->pk;
+
+ /* If certificate uses an EC key, make sure the curve is OK */
+ if( pk_can_do( pk, POLARSSL_PK_ECKEY ) &&
+ ! ssl_curve_is_acceptable( ssl, pk_ec( *pk )->grp.id ) )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
+ if( ret == 0 )
+ ret = POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE;
+ }
+ }
+#endif /* POLARSSL_SSL_SET_CURVES */
+
+ if( ssl_check_cert_usage( ssl->session_negotiate->peer_cert,
+ ciphersuite_info,
+ ! ssl->endpoint,
+ &ssl->session_negotiate->verify_result ) != 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
+ if( ret == 0 )
+ ret = POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE;
+ }
+
+ if( ssl->authmode != SSL_VERIFY_REQUIRED )
+ ret = 0;
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
+
+ return( ret );
+}
+#endif /* !POLARSSL_KEY_EXCHANGE_RSA_ENABLED
+ !POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED
+ !POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED
+ !POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED
+ !POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
+ !POLARSSL_KEY_EXCHANGE_ECDH_RSA_ENABLED
+ !POLARSSL_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
+
+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->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" ) );
+
+ 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_optimize_checksum( ssl_context *ssl,
+ const ssl_ciphersuite_t *ciphersuite_info )
+{
+ ((void) ciphersuite_info);
+
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_1)
+ if( ssl->minor_ver < SSL_MINOR_VERSION_3 )
+ ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
+ else
+#endif
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA512_C)
+ if( ciphersuite_info->mac == POLARSSL_MD_SHA384 )
+ ssl->handshake->update_checksum = ssl_update_checksum_sha384;
+ else
+#endif
+#if defined(POLARSSL_SHA256_C)
+ if( ciphersuite_info->mac != POLARSSL_MD_SHA384 )
+ ssl->handshake->update_checksum = ssl_update_checksum_sha256;
+ else
+#endif
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return;
+ }
+}
+
+static void ssl_update_checksum_start( ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_1)
+ md5_update( &ssl->handshake->fin_md5 , buf, len );
+ sha1_update( &ssl->handshake->fin_sha1, buf, len );
+#endif
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA256_C)
+ sha256_update( &ssl->handshake->fin_sha256, buf, len );
+#endif
+#if defined(POLARSSL_SHA512_C)
+ sha512_update( &ssl->handshake->fin_sha512, buf, len );
+#endif
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+}
+
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_1)
+static void ssl_update_checksum_md5sha1( ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ md5_update( &ssl->handshake->fin_md5 , buf, len );
+ sha1_update( &ssl->handshake->fin_sha1, buf, len );
+}
+#endif
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA256_C)
+static void ssl_update_checksum_sha256( ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ sha256_update( &ssl->handshake->fin_sha256, buf, len );
+}
+#endif
+
+#if defined(POLARSSL_SHA512_C)
+static void ssl_update_checksum_sha384( ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ sha512_update( &ssl->handshake->fin_sha512, buf, len );
+}
+#endif
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+static void ssl_calc_finished_ssl(
+ ssl_context *ssl, unsigned char *buf, int from )
+{
+ const char *sender;
+ md5_context md5;
+ sha1_context sha1;
+
+ unsigned char padbuf[48];
+ unsigned char md5sum[16];
+ unsigned char sha1sum[20];
+
+ ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
+
+ memcpy( &md5 , &ssl->handshake->fin_md5 , sizeof(md5_context) );
+ memcpy( &sha1, &ssl->handshake->fin_sha1, sizeof(sha1_context) );
+
+ /*
+ * SSLv3:
+ * hash =
+ * MD5( master + pad2 +
+ * MD5( handshake + sender + master + pad1 ) )
+ * + SHA1( master + pad2 +
+ * SHA1( handshake + sender + master + pad1 ) )
+ */
+
+#if !defined(POLARSSL_MD5_ALT)
+ SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
+ md5.state, sizeof( md5.state ) );
+#endif
+
+#if !defined(POLARSSL_SHA1_ALT)
+ SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
+ sha1.state, sizeof( sha1.state ) );
+#endif
+
+ sender = ( from == SSL_IS_CLIENT ) ? "CLNT"
+ : "SRVR";
+
+ memset( padbuf, 0x36, 48 );
+
+ md5_update( &md5, (const unsigned char *) sender, 4 );
+ md5_update( &md5, session->master, 48 );
+ md5_update( &md5, padbuf, 48 );
+ md5_finish( &md5, md5sum );
+
+ sha1_update( &sha1, (const unsigned char *) sender, 4 );
+ sha1_update( &sha1, session->master, 48 );
+ sha1_update( &sha1, padbuf, 40 );
+ sha1_finish( &sha1, sha1sum );
+
+ memset( padbuf, 0x5C, 48 );
+
+ md5_starts( &md5 );
+ md5_update( &md5, session->master, 48 );
+ md5_update( &md5, padbuf, 48 );
+ md5_update( &md5, md5sum, 16 );
+ md5_finish( &md5, buf );
+
+ sha1_starts( &sha1 );
+ sha1_update( &sha1, 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 );
+
+ md5_free( &md5 );
+ sha1_free( &sha1 );
+
+ polarssl_zeroize( padbuf, sizeof( padbuf ) );
+ polarssl_zeroize( md5sum, sizeof( md5sum ) );
+ polarssl_zeroize( sha1sum, sizeof( sha1sum ) );
+
+ SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1)
+static void ssl_calc_finished_tls(
+ ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ md5_context md5;
+ sha1_context sha1;
+ unsigned char padbuf[36];
+
+ ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
+
+ memcpy( &md5 , &ssl->handshake->fin_md5 , sizeof(md5_context) );
+ memcpy( &sha1, &ssl->handshake->fin_sha1, sizeof(sha1_context) );
+
+ /*
+ * TLSv1:
+ * hash = PRF( master, finished_label,
+ * MD5( handshake ) + SHA1( handshake ) )[0..11]
+ */
+
+#if !defined(POLARSSL_MD5_ALT)
+ SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
+ md5.state, sizeof( md5.state ) );
+#endif
+
+#if !defined(POLARSSL_SHA1_ALT)
+ SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
+ sha1.state, sizeof( sha1.state ) );
+#endif
+
+ sender = ( from == SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+ md5_finish( &md5, padbuf );
+ sha1_finish( &sha1, padbuf + 16 );
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 36, buf, len );
+
+ SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ md5_free( &md5 );
+ sha1_free( &sha1 );
+
+ polarssl_zeroize( padbuf, sizeof( padbuf ) );
+
+ SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 */
+
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA256_C)
+static void ssl_calc_finished_tls_sha256(
+ ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ sha256_context sha256;
+ unsigned char padbuf[32];
+
+ ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
+
+ memcpy( &sha256, &ssl->handshake->fin_sha256, sizeof(sha256_context) );
+
+ /*
+ * TLSv1.2:
+ * hash = PRF( master, finished_label,
+ * Hash( handshake ) )[0.11]
+ */
+
+#if !defined(POLARSSL_SHA256_ALT)
+ SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
+ sha256.state, sizeof( sha256.state ) );
+#endif
+
+ sender = ( from == SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+ sha256_finish( &sha256, padbuf );
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 32, buf, len );
+
+ SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ sha256_free( &sha256 );
+
+ polarssl_zeroize( padbuf, sizeof( padbuf ) );
+
+ SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* POLARSSL_SHA256_C */
+
+#if defined(POLARSSL_SHA512_C)
+static void ssl_calc_finished_tls_sha384(
+ ssl_context *ssl, unsigned char *buf, int from )
+{
+ int len = 12;
+ const char *sender;
+ sha512_context sha512;
+ unsigned char padbuf[48];
+
+ ssl_session *session = ssl->session_negotiate;
+ if( !session )
+ session = ssl->session;
+
+ SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
+
+ memcpy( &sha512, &ssl->handshake->fin_sha512, sizeof(sha512_context) );
+
+ /*
+ * TLSv1.2:
+ * hash = PRF( master, finished_label,
+ * Hash( handshake ) )[0.11]
+ */
+
+#if !defined(POLARSSL_SHA512_ALT)
+ SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
+ sha512.state, sizeof( sha512.state ) );
+#endif
+
+ sender = ( from == SSL_IS_CLIENT )
+ ? "client finished"
+ : "server finished";
+
+ sha512_finish( &sha512, padbuf );
+
+ ssl->handshake->tls_prf( session->master, 48, sender,
+ padbuf, 48, buf, len );
+
+ SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
+
+ sha512_free( &sha512 );
+
+ polarssl_zeroize( padbuf, sizeof( padbuf ) );
+
+ SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
+}
+#endif /* POLARSSL_SHA512_C */
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+
+void ssl_handshake_wrapup( ssl_context *ssl )
+{
+ int resume = ssl->handshake->resume;
+
+ SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
+
+ /*
+ * Free our handshake params
+ */
+ ssl_handshake_free( ssl->handshake );
+ polarssl_free( ssl->handshake );
+ ssl->handshake = NULL;
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+ if( ssl->renegotiation == SSL_RENEGOTIATION )
+ {
+ ssl->renegotiation = SSL_RENEGOTIATION_DONE;
+ ssl->renego_records_seen = 0;
+ }
+#endif
+
+ /*
+ * Switch in our now active transform context
+ */
+ if( ssl->transform )
+ {
+ ssl_transform_free( ssl->transform );
+ polarssl_free( ssl->transform );
+ }
+ ssl->transform = ssl->transform_negotiate;
+ ssl->transform_negotiate = NULL;
+
+ if( ssl->session )
+ {
+#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
+ /* RFC 7366 3.1: keep the EtM state */
+ ssl->session_negotiate->encrypt_then_mac =
+ ssl->session->encrypt_then_mac;
+#endif
+
+ ssl_session_free( ssl->session );
+ polarssl_free( ssl->session );
+ }
+ ssl->session = ssl->session_negotiate;
+ ssl->session_negotiate = NULL;
+
+ /*
+ * Add cache entry
+ */
+ if( ssl->f_set_cache != NULL &&
+ ssl->session->length != 0 &&
+ resume == 0 )
+ {
+ if( ssl->f_set_cache( ssl->p_set_cache, ssl->session ) != 0 )
+ SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
+ }
+
+ ssl->state++;
+
+ SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
+}
+
+int ssl_write_finished( ssl_context *ssl )
+{
+ int ret, hash_len;
+
+ SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
+
+ /*
+ * Set the out_msg pointer to the correct location based on IV length
+ */
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_2 )
+ {
+ ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen -
+ ssl->transform_negotiate->fixed_ivlen;
+ }
+ else
+ ssl->out_msg = ssl->out_iv;
+
+ ssl->handshake->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;
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+ ssl->verify_data_len = hash_len;
+ memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
+#endif
+
+ 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->handshake->resume != 0 )
+ {
+#if defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT )
+ ssl->state = SSL_HANDSHAKE_WRAPUP;
+#endif
+#if defined(POLARSSL_SSL_SRV_C)
+ if( ssl->endpoint == SSL_IS_SERVER )
+ ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC;
+#endif
+ }
+ else
+ ssl->state++;
+
+ /*
+ * Switch to our negotiated transform and session parameters for outbound
+ * data.
+ */
+ SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
+ ssl->transform_out = ssl->transform_negotiate;
+ ssl->session_out = ssl->session_negotiate;
+ memset( ssl->out_ctr, 0, 8 );
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+ if( ssl_hw_record_activate != NULL )
+ {
+ if( ( ret = ssl_hw_record_activate( ssl, SSL_CHANNEL_OUTBOUND ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_hw_record_activate", ret );
+ return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+ 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->handshake->calc_finished( ssl, buf, ssl->endpoint ^ 1 );
+
+ /*
+ * Switch to our negotiated transform and session parameters for inbound
+ * data.
+ */
+ SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
+ ssl->transform_in = ssl->transform_negotiate;
+ ssl->session_in = ssl->session_negotiate;
+ memset( ssl->in_ctr, 0, 8 );
+
+ /*
+ * Set the in_msg pointer to the correct location based on IV length
+ */
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_2 )
+ {
+ ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen -
+ ssl->transform_negotiate->fixed_ivlen;
+ }
+ else
+ ssl->in_msg = ssl->in_iv;
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+ if( ssl_hw_record_activate != NULL )
+ {
+ if( ( ret = ssl_hw_record_activate( ssl, SSL_CHANNEL_INBOUND ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_hw_record_activate", ret );
+ return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+ 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( safer_memcmp( ssl->in_msg + 4, buf, hash_len ) != 0 )
+ {
+ SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
+ return( POLARSSL_ERR_SSL_BAD_HS_FINISHED );
+ }
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+ ssl->verify_data_len = hash_len;
+ memcpy( ssl->peer_verify_data, buf, hash_len );
+#endif
+
+ if( ssl->handshake->resume != 0 )
+ {
+#if defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT )
+ ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC;
+#endif
+#if defined(POLARSSL_SSL_SRV_C)
+ if( ssl->endpoint == SSL_IS_SERVER )
+ ssl->state = SSL_HANDSHAKE_WRAPUP;
+#endif
+ }
+ else
+ ssl->state++;
+
+ SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
+
+ return( 0 );
+}
+
+static void ssl_handshake_params_init( ssl_handshake_params *handshake )
+{
+ memset( handshake, 0, sizeof( ssl_handshake_params ) );
+
+#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_1)
+ md5_init( &handshake->fin_md5 );
+ sha1_init( &handshake->fin_sha1 );
+ md5_starts( &handshake->fin_md5 );
+ sha1_starts( &handshake->fin_sha1 );
+#endif
+#if defined(POLARSSL_SSL_PROTO_TLS1_2)
+#if defined(POLARSSL_SHA256_C)
+ sha256_init( &handshake->fin_sha256 );
+ sha256_starts( &handshake->fin_sha256, 0 );
+#endif
+#if defined(POLARSSL_SHA512_C)
+ sha512_init( &handshake->fin_sha512 );
+ sha512_starts( &handshake->fin_sha512, 1 );
+#endif
+#endif /* POLARSSL_SSL_PROTO_TLS1_2 */
+
+ handshake->update_checksum = ssl_update_checksum_start;
+ handshake->sig_alg = SSL_HASH_SHA1;
+
+#if defined(POLARSSL_DHM_C)
+ dhm_init( &handshake->dhm_ctx );
+#endif
+#if defined(POLARSSL_ECDH_C)
+ ecdh_init( &handshake->ecdh_ctx );
+#endif
+}
+
+static void ssl_transform_init( ssl_transform *transform )
+{
+ memset( transform, 0, sizeof(ssl_transform) );
+
+ cipher_init( &transform->cipher_ctx_enc );
+ cipher_init( &transform->cipher_ctx_dec );
+
+ md_init( &transform->md_ctx_enc );
+ md_init( &transform->md_ctx_dec );
+}
+
+void ssl_session_init( ssl_session *session )
+{
+ memset( session, 0, sizeof(ssl_session) );
+}
+
+static int ssl_handshake_init( ssl_context *ssl )
+{
+ /* Clear old handshake information if present */
+ if( ssl->transform_negotiate )
+ ssl_transform_free( ssl->transform_negotiate );
+ if( ssl->session_negotiate )
+ ssl_session_free( ssl->session_negotiate );
+ if( ssl->handshake )
+ ssl_handshake_free( ssl->handshake );
+
+ /*
+ * Either the pointers are now NULL or cleared properly and can be freed.
+ * Now allocate missing structures.
+ */
+ if( ssl->transform_negotiate == NULL )
+ {
+ ssl->transform_negotiate = polarssl_malloc( sizeof(ssl_transform) );
+ }
+
+ if( ssl->session_negotiate == NULL )
+ {
+ ssl->session_negotiate = polarssl_malloc( sizeof(ssl_session) );
+ }
+
+ if( ssl->handshake == NULL )
+ {
+ ssl->handshake = polarssl_malloc( sizeof(ssl_handshake_params) );
+ }
+
+ /* All pointers should exist and can be directly freed without issue */
+ if( ssl->handshake == NULL ||
+ ssl->transform_negotiate == NULL ||
+ ssl->session_negotiate == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "malloc() of ssl sub-contexts failed" ) );
+
+ polarssl_free( ssl->handshake );
+ polarssl_free( ssl->transform_negotiate );
+ polarssl_free( ssl->session_negotiate );
+
+ ssl->handshake = NULL;
+ ssl->transform_negotiate = NULL;
+ ssl->session_negotiate = NULL;
+
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+ }
+
+ /* Initialize structures */
+ ssl_session_init( ssl->session_negotiate );
+ ssl_transform_init( ssl->transform_negotiate );
+ ssl_handshake_params_init( ssl->handshake );
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+ ssl->handshake->key_cert = ssl->key_cert;
+#endif
+
+ return( 0 );
+}
+
+/*
+ * Initialize an SSL context
+ */
+int ssl_init( ssl_context *ssl )
+{
+ int ret;
+ int len = SSL_BUFFER_LEN;
+
+ memset( ssl, 0, sizeof( ssl_context ) );
+
+ /*
+ * Sane defaults
+ */
+ ssl->min_major_ver = SSL_MIN_MAJOR_VERSION;
+ ssl->min_minor_ver = SSL_MIN_MINOR_VERSION;
+ ssl->max_major_ver = SSL_MAX_MAJOR_VERSION;
+ ssl->max_minor_ver = SSL_MAX_MINOR_VERSION;
+
+ ssl_set_ciphersuites( ssl, ssl_list_ciphersuites() );
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+ ssl->renego_max_records = SSL_RENEGO_MAX_RECORDS_DEFAULT;
+ memset( ssl->renego_period, 0xFF, 7 );
+ ssl->renego_period[7] = 0x00;
+#endif
+
+#if defined(POLARSSL_DHM_C)
+ if( ( ret = mpi_read_string( &ssl->dhm_P, 16,
+ POLARSSL_DHM_RFC5114_MODP_1024_P) ) != 0 ||
+ ( ret = mpi_read_string( &ssl->dhm_G, 16,
+ POLARSSL_DHM_RFC5114_MODP_1024_G) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "mpi_read_string", ret );
+ return( ret );
+ }
+#endif
+
+ /*
+ * Prepare base structures
+ */
+ if( ( ssl->in_ctr = polarssl_malloc( len ) ) == NULL ||
+ ( ssl->out_ctr = polarssl_malloc( len ) ) == NULL )
+ {
+ SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) );
+ polarssl_free( ssl->in_ctr );
+ ssl->in_ctr = NULL;
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+ }
+
+ memset( ssl-> in_ctr, 0, SSL_BUFFER_LEN );
+ memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
+
+ ssl->in_hdr = ssl->in_ctr + 8;
+ ssl->in_iv = ssl->in_ctr + 13;
+ ssl->in_msg = ssl->in_ctr + 13;
+
+ ssl->out_hdr = ssl->out_ctr + 8;
+ ssl->out_iv = ssl->out_ctr + 13;
+ ssl->out_msg = ssl->out_ctr + 13;
+
+#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
+ ssl->encrypt_then_mac = SSL_ETM_ENABLED;
+#endif
+
+#if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET)
+ ssl->extended_ms = SSL_EXTENDED_MS_ENABLED;
+#endif
+
+#if defined(POLARSSL_SSL_SESSION_TICKETS)
+ ssl->ticket_lifetime = SSL_DEFAULT_TICKET_LIFETIME;
+#endif
+
+#if defined(POLARSSL_SSL_SET_CURVES)
+ ssl->curve_list = ecp_grp_id_list( );
+#endif
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ return( ret );
+
+ return( 0 );
+}
+
+/*
+ * Reset an initialized and used SSL context for re-use while retaining
+ * all application-set variables, function pointers and data.
+ */
+int ssl_session_reset( ssl_context *ssl )
+{
+ int ret;
+
+ ssl->state = SSL_HELLO_REQUEST;
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+ ssl->renegotiation = SSL_INITIAL_HANDSHAKE;
+ ssl->renego_records_seen = 0;
+
+ ssl->verify_data_len = 0;
+ memset( ssl->own_verify_data, 0, SSL_VERIFY_DATA_MAX_LEN );
+ memset( ssl->peer_verify_data, 0, SSL_VERIFY_DATA_MAX_LEN );
+#endif
+ ssl->secure_renegotiation = SSL_LEGACY_RENEGOTIATION;
+
+ ssl->in_offt = NULL;
+
+ ssl->in_msg = ssl->in_ctr + 13;
+ ssl->in_msgtype = 0;
+ ssl->in_msglen = 0;
+ ssl->in_left = 0;
+
+ ssl->in_hslen = 0;
+ ssl->nb_zero = 0;
+ ssl->record_read = 0;
+
+ ssl->out_msg = ssl->out_ctr + 13;
+ ssl->out_msgtype = 0;
+ ssl->out_msglen = 0;
+ ssl->out_left = 0;
+#if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING)
+ if( ssl->split_done != SSL_CBC_RECORD_SPLITTING_DISABLED )
+ ssl->split_done = 0;
+#endif
+
+ ssl->transform_in = NULL;
+ ssl->transform_out = NULL;
+
+ memset( ssl->out_ctr, 0, SSL_BUFFER_LEN );
+ memset( ssl->in_ctr, 0, SSL_BUFFER_LEN );
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+ if( ssl_hw_record_reset != NULL )
+ {
+ SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_reset()" ) );
+ if( ( ret = ssl_hw_record_reset( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_hw_record_reset", ret );
+ return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED );
+ }
+ }
+#endif
+
+ if( ssl->transform )
+ {
+ ssl_transform_free( ssl->transform );
+ polarssl_free( ssl->transform );
+ ssl->transform = NULL;
+ }
+
+ if( ssl->session )
+ {
+ ssl_session_free( ssl->session );
+ polarssl_free( ssl->session );
+ ssl->session = NULL;
+ }
+
+#if defined(POLARSSL_SSL_ALPN)
+ ssl->alpn_chosen = NULL;
+#endif
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ return( ret );
+
+ return( 0 );
+}
+
+#if defined(POLARSSL_SSL_SESSION_TICKETS)
+static void ssl_ticket_keys_free( ssl_ticket_keys *tkeys )
+{
+ aes_free( &tkeys->enc );
+ aes_free( &tkeys->dec );
+
+ polarssl_zeroize( tkeys, sizeof(ssl_ticket_keys) );
+}
+
+/*
+ * Allocate and initialize ticket keys
+ */
+static int ssl_ticket_keys_init( ssl_context *ssl )
+{
+ int ret;
+ ssl_ticket_keys *tkeys;
+ unsigned char buf[16];
+
+ if( ssl->ticket_keys != NULL )
+ return( 0 );
+
+ tkeys = polarssl_malloc( sizeof(ssl_ticket_keys) );
+ if( tkeys == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ aes_init( &tkeys->enc );
+ aes_init( &tkeys->dec );
+
+ if( ( ret = ssl->f_rng( ssl->p_rng, tkeys->key_name, 16 ) ) != 0 )
+ {
+ ssl_ticket_keys_free( tkeys );
+ polarssl_free( tkeys );
+ return( ret );
+ }
+
+ if( ( ret = ssl->f_rng( ssl->p_rng, buf, 16 ) ) != 0 ||
+ ( ret = aes_setkey_enc( &tkeys->enc, buf, 128 ) ) != 0 ||
+ ( ret = aes_setkey_dec( &tkeys->dec, buf, 128 ) ) != 0 )
+ {
+ ssl_ticket_keys_free( tkeys );
+ polarssl_free( tkeys );
+ return( ret );
+ }
+
+ if( ( ret = ssl->f_rng( ssl->p_rng, tkeys->mac_key, 16 ) ) != 0 )
+ {
+ ssl_ticket_keys_free( tkeys );
+ polarssl_free( tkeys );
+ return( ret );
+ }
+
+ ssl->ticket_keys = tkeys;
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_SESSION_TICKETS */
+
+/*
+ * SSL set accessors
+ */
+void ssl_set_endpoint( ssl_context *ssl, int endpoint )
+{
+ ssl->endpoint = endpoint;
+
+#if defined(POLARSSL_SSL_SESSION_TICKETS) && \
+ defined(POLARSSL_SSL_CLI_C)
+ if( endpoint == SSL_IS_CLIENT )
+ ssl->session_tickets = SSL_SESSION_TICKETS_ENABLED;
+#endif
+
+#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
+ if( endpoint == SSL_IS_SERVER )
+ ssl->trunc_hmac = SSL_TRUNC_HMAC_ENABLED;
+#endif
+}
+
+void ssl_set_authmode( ssl_context *ssl, int authmode )
+{
+ ssl->authmode = authmode;
+}
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+void ssl_set_verify( ssl_context *ssl,
+ int (*f_vrfy)(void *, x509_crt *, int, int *),
+ void *p_vrfy )
+{
+ ssl->f_vrfy = f_vrfy;
+ ssl->p_vrfy = p_vrfy;
+}
+#endif /* POLARSSL_X509_CRT_PARSE_C */
+
+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;
+}
+
+#if defined(POLARSSL_SSL_SRV_C)
+void ssl_set_session_cache( ssl_context *ssl,
+ int (*f_get_cache)(void *, ssl_session *), void *p_get_cache,
+ int (*f_set_cache)(void *, const ssl_session *), void *p_set_cache )
+{
+ ssl->f_get_cache = f_get_cache;
+ ssl->p_get_cache = p_get_cache;
+ ssl->f_set_cache = f_set_cache;
+ ssl->p_set_cache = p_set_cache;
+}
+#endif /* POLARSSL_SSL_SRV_C */
+
+#if defined(POLARSSL_SSL_CLI_C)
+int ssl_set_session( ssl_context *ssl, const ssl_session *session )
+{
+ int ret;
+
+ if( ssl == NULL ||
+ session == NULL ||
+ ssl->session_negotiate == NULL ||
+ ssl->endpoint != SSL_IS_CLIENT )
+ {
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 )
+ return( ret );
+
+ ssl->handshake->resume = 1;
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_CLI_C */
+
+void ssl_set_ciphersuites( ssl_context *ssl, const int *ciphersuites )
+{
+ ssl->ciphersuite_list[SSL_MINOR_VERSION_0] = ciphersuites;
+ ssl->ciphersuite_list[SSL_MINOR_VERSION_1] = ciphersuites;
+ ssl->ciphersuite_list[SSL_MINOR_VERSION_2] = ciphersuites;
+ ssl->ciphersuite_list[SSL_MINOR_VERSION_3] = ciphersuites;
+}
+
+void ssl_set_ciphersuites_for_version( ssl_context *ssl,
+ const int *ciphersuites,
+ int major, int minor )
+{
+ if( major != SSL_MAJOR_VERSION_3 )
+ return;
+
+ if( minor < SSL_MINOR_VERSION_0 || minor > SSL_MINOR_VERSION_3 )
+ return;
+
+ ssl->ciphersuite_list[minor] = ciphersuites;
+}
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+/* Add a new (empty) key_cert entry an return a pointer to it */
+static ssl_key_cert *ssl_add_key_cert( ssl_context *ssl )
+{
+ ssl_key_cert *key_cert, *last;
+
+ key_cert = polarssl_malloc( sizeof(ssl_key_cert) );
+ if( key_cert == NULL )
+ return( NULL );
+
+ memset( key_cert, 0, sizeof( ssl_key_cert ) );
+
+ /* Append the new key_cert to the (possibly empty) current list */
+ if( ssl->key_cert == NULL )
+ {
+ ssl->key_cert = key_cert;
+ if( ssl->handshake != NULL )
+ ssl->handshake->key_cert = key_cert;
+ }
+ else
+ {
+ last = ssl->key_cert;
+ while( last->next != NULL )
+ last = last->next;
+ last->next = key_cert;
+ }
+
+ return( key_cert );
+}
+
+void ssl_set_ca_chain( ssl_context *ssl, x509_crt *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;
+}
+
+int ssl_set_own_cert( ssl_context *ssl, x509_crt *own_cert,
+ pk_context *pk_key )
+{
+ ssl_key_cert *key_cert = ssl_add_key_cert( ssl );
+
+ if( key_cert == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ key_cert->cert = own_cert;
+ key_cert->key = pk_key;
+
+ return( 0 );
+}
+
+#if ! defined(POLARSSL_DEPRECATED_REMOVED)
+#if defined(POLARSSL_RSA_C)
+int ssl_set_own_cert_rsa( ssl_context *ssl, x509_crt *own_cert,
+ rsa_context *rsa_key )
+{
+ int ret;
+ ssl_key_cert *key_cert = ssl_add_key_cert( ssl );
+
+ if( key_cert == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ key_cert->key = polarssl_malloc( sizeof(pk_context) );
+ if( key_cert->key == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ pk_init( key_cert->key );
+
+ ret = pk_init_ctx( key_cert->key, pk_info_from_type( POLARSSL_PK_RSA ) );
+ if( ret != 0 )
+ return( ret );
+
+ if( ( ret = rsa_copy( pk_rsa( *key_cert->key ), rsa_key ) ) != 0 )
+ return( ret );
+
+ key_cert->cert = own_cert;
+ key_cert->key_own_alloc = 1;
+
+ return( 0 );
+}
+#endif /* POLARSSL_RSA_C */
+
+int ssl_set_own_cert_alt( ssl_context *ssl, x509_crt *own_cert,
+ void *rsa_key,
+ rsa_decrypt_func rsa_decrypt,
+ rsa_sign_func rsa_sign,
+ rsa_key_len_func rsa_key_len )
+{
+ int ret;
+ ssl_key_cert *key_cert = ssl_add_key_cert( ssl );
+
+ if( key_cert == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ key_cert->key = polarssl_malloc( sizeof(pk_context) );
+ if( key_cert->key == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ pk_init( key_cert->key );
+
+ if( ( ret = pk_init_ctx_rsa_alt( key_cert->key, rsa_key,
+ rsa_decrypt, rsa_sign, rsa_key_len ) ) != 0 )
+ return( ret );
+
+ key_cert->cert = own_cert;
+ key_cert->key_own_alloc = 1;
+
+ return( 0 );
+}
+#endif /* POLARSSL_DEPRECATED_REMOVED */
+#endif /* POLARSSL_X509_CRT_PARSE_C */
+
+#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
+int ssl_set_psk( ssl_context *ssl, const unsigned char *psk, size_t psk_len,
+ const unsigned char *psk_identity, size_t psk_identity_len )
+{
+ if( psk == NULL || psk_identity == NULL )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ if( psk_len > POLARSSL_PSK_MAX_LEN )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ssl->psk != NULL || ssl->psk_identity != NULL )
+ {
+ polarssl_free( ssl->psk );
+ polarssl_free( ssl->psk_identity );
+ }
+
+ if( ( ssl->psk = polarssl_malloc( psk_len ) ) == NULL ||
+ ( ssl->psk_identity = polarssl_malloc( psk_identity_len ) ) == NULL )
+ {
+ polarssl_free( ssl->psk );
+ ssl->psk = NULL;
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+ }
+
+ ssl->psk_len = psk_len;
+ ssl->psk_identity_len = psk_identity_len;
+
+ memcpy( ssl->psk, psk, ssl->psk_len );
+ memcpy( ssl->psk_identity, psk_identity, ssl->psk_identity_len );
+
+ return( 0 );
+}
+
+void ssl_set_psk_cb( ssl_context *ssl,
+ int (*f_psk)(void *, ssl_context *, const unsigned char *,
+ size_t),
+ void *p_psk )
+{
+ ssl->f_psk = f_psk;
+ ssl->p_psk = p_psk;
+}
+#endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */
+
+#if defined(POLARSSL_DHM_C)
+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_P, 16, dhm_P ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "mpi_read_string", ret );
+ return( ret );
+ }
+
+ if( ( ret = mpi_read_string( &ssl->dhm_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_P, &dhm_ctx->P ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "mpi_copy", ret );
+ return( ret );
+ }
+
+ if( ( ret = mpi_copy( &ssl->dhm_G, &dhm_ctx->G ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "mpi_copy", ret );
+ return( ret );
+ }
+
+ return( 0 );
+}
+#endif /* POLARSSL_DHM_C */
+
+#if defined(POLARSSL_SSL_SET_CURVES)
+/*
+ * Set the allowed elliptic curves
+ */
+void ssl_set_curves( ssl_context *ssl, const ecp_group_id *curve_list )
+{
+ ssl->curve_list = curve_list;
+}
+#endif
+
+#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
+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 );
+
+ if( ssl->hostname_len + 1 == 0 )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->hostname = polarssl_malloc( ssl->hostname_len + 1 );
+
+ if( ssl->hostname == NULL )
+ return( POLARSSL_ERR_SSL_MALLOC_FAILED );
+
+ memcpy( ssl->hostname, (const unsigned char *) hostname,
+ ssl->hostname_len );
+
+ ssl->hostname[ssl->hostname_len] = '\0';
+
+ return( 0 );
+}
+
+void ssl_set_sni( ssl_context *ssl,
+ int (*f_sni)(void *, ssl_context *,
+ const unsigned char *, size_t),
+ void *p_sni )
+{
+ ssl->f_sni = f_sni;
+ ssl->p_sni = p_sni;
+}
+#endif /* POLARSSL_SSL_SERVER_NAME_INDICATION */
+
+#if defined(POLARSSL_SSL_ALPN)
+int ssl_set_alpn_protocols( ssl_context *ssl, const char **protos )
+{
+ size_t cur_len, tot_len;
+ const char **p;
+
+ /*
+ * "Empty strings MUST NOT be included and byte strings MUST NOT be
+ * truncated". Check lengths now rather than later.
+ */
+ tot_len = 0;
+ for( p = protos; *p != NULL; p++ )
+ {
+ cur_len = strlen( *p );
+ tot_len += cur_len;
+
+ if( cur_len == 0 || cur_len > 255 || tot_len > 65535 )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ ssl->alpn_list = protos;
+
+ return( 0 );
+}
+
+const char *ssl_get_alpn_protocol( const ssl_context *ssl )
+{
+ return( ssl->alpn_chosen );
+}
+#endif /* POLARSSL_SSL_ALPN */
+
+void ssl_set_max_version( ssl_context *ssl, int major, int minor )
+{
+ if( major >= SSL_MIN_MAJOR_VERSION && major <= SSL_MAX_MAJOR_VERSION &&
+ minor >= SSL_MIN_MINOR_VERSION && minor <= SSL_MAX_MINOR_VERSION )
+ {
+ ssl->max_major_ver = major;
+ ssl->max_minor_ver = minor;
+ }
+}
+
+void ssl_set_min_version( ssl_context *ssl, int major, int minor )
+{
+ if( major >= SSL_MIN_MAJOR_VERSION && major <= SSL_MAX_MAJOR_VERSION &&
+ minor >= SSL_MIN_MINOR_VERSION && minor <= SSL_MAX_MINOR_VERSION )
+ {
+ ssl->min_major_ver = major;
+ ssl->min_minor_ver = minor;
+ }
+}
+
+#if defined(POLARSSL_SSL_FALLBACK_SCSV) && defined(POLARSSL_SSL_CLI_C)
+void ssl_set_fallback( ssl_context *ssl, char fallback )
+{
+ ssl->fallback = fallback;
+}
+#endif
+
+#if defined(POLARSSL_SSL_ENCRYPT_THEN_MAC)
+void ssl_set_encrypt_then_mac( ssl_context *ssl, char etm )
+{
+ ssl->encrypt_then_mac = etm;
+}
+#endif
+
+#if defined(POLARSSL_SSL_EXTENDED_MASTER_SECRET)
+void ssl_set_extended_master_secret( ssl_context *ssl, char ems )
+{
+ ssl->extended_ms = ems;
+}
+#endif
+
+void ssl_set_arc4_support( ssl_context *ssl, char arc4 )
+{
+ ssl->arc4_disabled = arc4;
+}
+
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
+int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code )
+{
+ if( mfl_code >= SSL_MAX_FRAG_LEN_INVALID ||
+ mfl_code_to_length[mfl_code] > SSL_MAX_CONTENT_LEN )
+ {
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ ssl->mfl_code = mfl_code;
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
+
+#if defined(POLARSSL_SSL_TRUNCATED_HMAC)
+int ssl_set_truncated_hmac( ssl_context *ssl, int truncate )
+{
+ ssl->trunc_hmac = truncate;
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_TRUNCATED_HMAC */
+
+#if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING)
+void ssl_set_cbc_record_splitting( ssl_context *ssl, char split )
+{
+ ssl->split_done = split;
+}
+#endif
+
+void ssl_legacy_renegotiation( ssl_context *ssl, int allow_legacy )
+{
+ ssl->allow_legacy_renegotiation = allow_legacy;
+}
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+void ssl_set_renegotiation( ssl_context *ssl, int renegotiation )
+{
+ ssl->disable_renegotiation = renegotiation;
+}
+
+void ssl_set_renegotiation_enforced( ssl_context *ssl, int max_records )
+{
+ ssl->renego_max_records = max_records;
+}
+
+void ssl_set_renegotiation_period( ssl_context *ssl,
+ const unsigned char period[8] )
+{
+ memcpy( ssl->renego_period, period, 8 );
+}
+#endif /* POLARSSL_SSL_RENEGOTIATION */
+
+#if defined(POLARSSL_SSL_SESSION_TICKETS)
+int ssl_set_session_tickets( ssl_context *ssl, int use_tickets )
+{
+ ssl->session_tickets = use_tickets;
+
+#if defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT )
+ return( 0 );
+#endif
+
+ if( use_tickets == SSL_SESSION_TICKETS_DISABLED )
+ return( 0 );
+
+ if( ssl->f_rng == NULL )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ return( ssl_ticket_keys_init( ssl ) );
+}
+
+void ssl_set_session_ticket_lifetime( ssl_context *ssl, int lifetime )
+{
+ ssl->ticket_lifetime = lifetime;
+}
+#endif /* POLARSSL_SSL_SESSION_TICKETS */
+
+/*
+ * 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 )
+{
+ if( ssl->session != NULL )
+ return( ssl->session->verify_result );
+
+ if( ssl->session_negotiate != NULL )
+ return( ssl->session_negotiate->verify_result );
+
+ return( -1 );
+}
+
+const char *ssl_get_ciphersuite( const ssl_context *ssl )
+{
+ if( ssl == NULL || ssl->session == NULL )
+ return( NULL );
+
+ 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" );
+}
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+const x509_crt *ssl_get_peer_cert( const ssl_context *ssl )
+{
+ if( ssl == NULL || ssl->session == NULL )
+ return( NULL );
+
+ return( ssl->session->peer_cert );
+}
+#endif /* POLARSSL_X509_CRT_PARSE_C */
+
+#if defined(POLARSSL_SSL_CLI_C)
+int ssl_get_session( const ssl_context *ssl, ssl_session *dst )
+{
+ if( ssl == NULL ||
+ dst == NULL ||
+ ssl->session == NULL ||
+ ssl->endpoint != SSL_IS_CLIENT )
+ {
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+ }
+
+ return( ssl_session_copy( dst, ssl->session ) );
+}
+#endif /* POLARSSL_SSL_CLI_C */
+
+/*
+ * Perform a single step of the SSL handshake
+ */
+int ssl_handshake_step( ssl_context *ssl )
+{
+ int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
+
+#if defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT )
+ ret = ssl_handshake_client_step( ssl );
+#endif
+#if defined(POLARSSL_SSL_SRV_C)
+ if( ssl->endpoint == SSL_IS_SERVER )
+ ret = ssl_handshake_server_step( ssl );
+#endif
+
+ return( ret );
+}
+
+/*
+ * Perform the SSL handshake
+ */
+int ssl_handshake( ssl_context *ssl )
+{
+ int ret = 0;
+
+ SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
+
+ while( ssl->state != SSL_HANDSHAKE_OVER )
+ {
+ ret = ssl_handshake_step( ssl );
+
+ if( ret != 0 )
+ break;
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
+
+ return( ret );
+}
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+#if defined(POLARSSL_SSL_SRV_C)
+/*
+ * Write HelloRequest to request renegotiation on server
+ */
+static int ssl_write_hello_request( ssl_context *ssl )
+{
+ int ret;
+
+ SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
+
+ ssl->out_msglen = 4;
+ ssl->out_msgtype = SSL_MSG_HANDSHAKE;
+ ssl->out_msg[0] = SSL_HS_HELLO_REQUEST;
+
+ if( ( ret = ssl_write_record( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_write_record", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_SRV_C */
+
+/*
+ * Actually renegotiate current connection, triggered by either:
+ * - any side: calling ssl_renegotiate(),
+ * - client: receiving a HelloRequest during ssl_read(),
+ * - server: receiving any handshake message on server during ssl_read() after
+ * the initial handshake is completed.
+ * If the handshake doesn't complete due to waiting for I/O, it will continue
+ * during the next calls to ssl_renegotiate() or ssl_read() respectively.
+ */
+static int ssl_start_renegotiation( ssl_context *ssl )
+{
+ int ret;
+
+ SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
+
+ if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
+ return( ret );
+
+ ssl->state = SSL_HELLO_REQUEST;
+ ssl->renegotiation = SSL_RENEGOTIATION;
+
+ if( ( ret = ssl_handshake( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_handshake", ret );
+ return( ret );
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
+
+ return( 0 );
+}
+
+/*
+ * Renegotiate current connection on client,
+ * or request renegotiation on server
+ */
+int ssl_renegotiate( ssl_context *ssl )
+{
+ int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE;
+
+#if defined(POLARSSL_SSL_SRV_C)
+ /* On server, just send the request */
+ if( ssl->endpoint == SSL_IS_SERVER )
+ {
+ if( ssl->state != SSL_HANDSHAKE_OVER )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ ssl->renegotiation = SSL_RENEGOTIATION_PENDING;
+
+ /* Did we already try/start sending HelloRequest? */
+ if( ssl->out_left != 0 )
+ return( ssl_flush_output( ssl ) );
+
+ return( ssl_write_hello_request( ssl ) );
+ }
+#endif /* POLARSSL_SSL_SRV_C */
+
+#if defined(POLARSSL_SSL_CLI_C)
+ /*
+ * On client, either start the renegotiation process or,
+ * if already in progress, continue the handshake
+ */
+ if( ssl->renegotiation != SSL_RENEGOTIATION )
+ {
+ if( ssl->state != SSL_HANDSHAKE_OVER )
+ return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
+
+ if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
+ return( ret );
+ }
+ }
+ else
+ {
+ if( ( ret = ssl_handshake( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_handshake", ret );
+ return( ret );
+ }
+ }
+#endif /* POLARSSL_SSL_CLI_C */
+
+ return( ret );
+}
+
+/*
+ * Check record counters and renegotiate if they're above the limit.
+ */
+static int ssl_check_ctr_renegotiate( ssl_context *ssl )
+{
+ if( ssl->state != SSL_HANDSHAKE_OVER ||
+ ssl->renegotiation == SSL_RENEGOTIATION_PENDING ||
+ ssl->disable_renegotiation == SSL_RENEGOTIATION_DISABLED )
+ {
+ return( 0 );
+ }
+
+ // TODO: adapt for DTLS
+ if( memcmp( ssl->in_ctr, ssl->renego_period, 8 ) <= 0 &&
+ memcmp( ssl->out_ctr, ssl->renego_period, 8 ) <= 0 )
+ {
+ return( 0 );
+ }
+
+ SSL_DEBUG_MSG( 0, ( "record counter limit reached: renegotiate" ) );
+ return( ssl_renegotiate( ssl ) );
+}
+#endif /* POLARSSL_SSL_RENEGOTIATION */
+
+/*
+ * Receive application data decrypted from the SSL layer
+ */
+int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len )
+{
+ int ret, record_read = 0;
+ size_t n;
+
+ SSL_DEBUG_MSG( 2, ( "=> read" ) );
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+ if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
+ return( ret );
+ }
+#endif
+
+ if( ssl->state != SSL_HANDSHAKE_OVER )
+ {
+ ret = ssl_handshake( ssl );
+ if( ret == POLARSSL_ERR_SSL_WAITING_SERVER_HELLO_RENEGO )
+ {
+ record_read = 1;
+ }
+ else if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_handshake", ret );
+ return( ret );
+ }
+ }
+
+ if( ssl->in_offt == NULL )
+ {
+ if( ! record_read )
+ {
+ 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 defined(POLARSSL_SSL_RENEGOTIATION)
+ if( ssl->in_msgtype == SSL_MSG_HANDSHAKE )
+ {
+ SSL_DEBUG_MSG( 1, ( "received handshake message" ) );
+
+#if defined(POLARSSL_SSL_CLI_C)
+ if( ssl->endpoint == SSL_IS_CLIENT &&
+ ( ssl->in_msg[0] != SSL_HS_HELLO_REQUEST ||
+ ssl->in_hslen != 4 ) )
+ {
+ SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) );
+ return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+#endif
+
+ if( ssl->disable_renegotiation == SSL_RENEGOTIATION_DISABLED ||
+ ( ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION &&
+ ssl->allow_legacy_renegotiation ==
+ SSL_LEGACY_NO_RENEGOTIATION ) )
+ {
+ SSL_DEBUG_MSG( 3, ( "ignoring renegotiation, sending alert" ) );
+
+#if defined(POLARSSL_SSL_PROTO_SSL3)
+ if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
+ {
+ /*
+ * SSLv3 does not have a "no_renegotiation" alert
+ */
+ if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
+ return( ret );
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_SSL3 */
+#if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \
+ defined(POLARSSL_SSL_PROTO_TLS1_2)
+ if( ssl->minor_ver >= SSL_MINOR_VERSION_1 )
+ {
+ if( ( ret = ssl_send_alert_message( ssl,
+ SSL_ALERT_LEVEL_WARNING,
+ SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 )
+ {
+ return( ret );
+ }
+ }
+ else
+#endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 ||
+ POLARSSL_SSL_PROTO_TLS1_2 */
+ {
+ SSL_DEBUG_MSG( 1, ( "should never happen" ) );
+ return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
+ }
+ }
+ else
+ {
+ ret = ssl_start_renegotiation( ssl );
+ if( ret == POLARSSL_ERR_SSL_WAITING_SERVER_HELLO_RENEGO )
+ {
+ record_read = 1;
+ }
+ else if( ret != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
+ return( ret );
+ }
+ }
+
+ /* If a non-handshake record was read during renego, fallthrough,
+ * else tell the user they should call ssl_read() again */
+ if( ! record_read )
+ return( POLARSSL_ERR_NET_WANT_READ );
+ }
+ else if( ssl->renegotiation == SSL_RENEGOTIATION_PENDING )
+ {
+ ssl->renego_records_seen++;
+
+ if( ssl->renego_max_records >= 0 &&
+ ssl->renego_records_seen > ssl->renego_max_records )
+ {
+ SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
+ "but not honored by client" ) );
+ return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE );
+ }
+ }
+#endif /* POLARSSL_SSL_RENEGOTIATION */
+
+ /* Fatal and closure alerts handled by ssl_read_record() */
+ if( ssl->in_msgtype == SSL_MSG_ALERT )
+ {
+ SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) );
+ return( POLARSSL_ERR_NET_WANT_READ );
+ }
+
+ 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,
+ * taking care of max fragment length and buffer size
+ */
+static int ssl_write_real( ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ int ret;
+ size_t n;
+ unsigned int max_len = SSL_MAX_CONTENT_LEN;
+
+#if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH)
+ /*
+ * Assume mfl_code is correct since it was checked when set
+ */
+ max_len = mfl_code_to_length[ssl->mfl_code];
+
+ /*
+ * Check if a smaller max length was negotiated
+ */
+ if( ssl->session_out != NULL &&
+ mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
+ {
+ max_len = mfl_code_to_length[ssl->session_out->mfl_code];
+ }
+#endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */
+
+ n = ( len < max_len) ? len : max_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 );
+ }
+ }
+
+ return( (int) n );
+}
+
+/*
+ * Write application data, doing 1/n-1 splitting if necessary.
+ *
+ * With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
+ * then the caller will call us again with the same arguments, so
+ * remember wether we already did the split or not.
+ */
+#if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING)
+static int ssl_write_split( ssl_context *ssl,
+ const unsigned char *buf, size_t len )
+{
+ int ret;
+
+ if( ssl->split_done == SSL_CBC_RECORD_SPLITTING_DISABLED ||
+ len <= 1 ||
+ ssl->minor_ver > SSL_MINOR_VERSION_1 ||
+ cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc )
+ != POLARSSL_MODE_CBC )
+ {
+ return( ssl_write_real( ssl, buf, len ) );
+ }
+
+ if( ssl->split_done == 0 )
+ {
+ if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 )
+ return( ret );
+ ssl->split_done = 1;
+ }
+
+ if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 )
+ return( ret );
+ ssl->split_done = 0;
+
+ return( ret + 1 );
+}
+#endif /* POLARSSL_SSL_CBC_RECORD_SPLITTING */
+
+/*
+ * Write application data (public-facing wrapper)
+ */
+int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len )
+{
+ int ret;
+
+ SSL_DEBUG_MSG( 2, ( "=> write" ) );
+
+#if defined(POLARSSL_SSL_RENEGOTIATION)
+ if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
+ return( ret );
+ }
+#endif
+
+ if( ssl->state != SSL_HANDSHAKE_OVER )
+ {
+ if( ( ret = ssl_handshake( ssl ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_handshake", ret );
+ return( ret );
+ }
+ }
+
+#if defined(POLARSSL_SSL_CBC_RECORD_SPLITTING)
+ ret = ssl_write_split( ssl, buf, len );
+#else
+ ret = ssl_write_real( ssl, buf, len );
+#endif
+
+ SSL_DEBUG_MSG( 2, ( "<= write" ) );
+
+ return( ret );
+}
+
+/*
+ * 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( ssl->out_left != 0 )
+ return( ssl_flush_output( ssl ) );
+
+ if( ssl->state == SSL_HANDSHAKE_OVER )
+ {
+ if( ( ret = ssl_send_alert_message( ssl,
+ SSL_ALERT_LEVEL_WARNING,
+ SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 )
+ {
+ SSL_DEBUG_RET( 1, "ssl_send_alert_message", ret );
+ return( ret );
+ }
+ }
+
+ SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
+
+ return( 0 );
+}
+
+void ssl_transform_free( ssl_transform *transform )
+{
+ if( transform == NULL )
+ return;
+
+#if defined(POLARSSL_ZLIB_SUPPORT)
+ deflateEnd( &transform->ctx_deflate );
+ inflateEnd( &transform->ctx_inflate );
+#endif
+
+ cipher_free( &transform->cipher_ctx_enc );
+ cipher_free( &transform->cipher_ctx_dec );
+
+ md_free( &transform->md_ctx_enc );
+ md_free( &transform->md_ctx_dec );
+
+ polarssl_zeroize( transform, sizeof( ssl_transform ) );
+}
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+static void ssl_key_cert_free( ssl_key_cert *key_cert )
+{
+ ssl_key_cert *cur = key_cert, *next;
+
+ while( cur != NULL )
+ {
+ next = cur->next;
+
+ if( cur->key_own_alloc )
+ {
+ pk_free( cur->key );
+ polarssl_free( cur->key );
+ }
+ polarssl_free( cur );
+
+ cur = next;
+ }
+}
+#endif /* POLARSSL_X509_CRT_PARSE_C */
+
+void ssl_handshake_free( ssl_handshake_params *handshake )
+{
+ if( handshake == NULL )
+ return;
+
+#if defined(POLARSSL_DHM_C)
+ dhm_free( &handshake->dhm_ctx );
+#endif
+#if defined(POLARSSL_ECDH_C)
+ ecdh_free( &handshake->ecdh_ctx );
+#endif
+
+#if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C)
+ /* explicit void pointer cast for buggy MS compiler */
+ polarssl_free( (void *) handshake->curves );
+#endif
+
+#if defined(POLARSSL_X509_CRT_PARSE_C) && \
+ defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
+ /*
+ * Free only the linked list wrapper, not the keys themselves
+ * since the belong to the SNI callback
+ */
+ if( handshake->sni_key_cert != NULL )
+ {
+ ssl_key_cert *cur = handshake->sni_key_cert, *next;
+
+ while( cur != NULL )
+ {
+ next = cur->next;
+ polarssl_free( cur );
+ cur = next;
+ }
+ }
+#endif /* POLARSSL_X509_CRT_PARSE_C && POLARSSL_SSL_SERVER_NAME_INDICATION */
+
+ polarssl_zeroize( handshake, sizeof( ssl_handshake_params ) );
+}
+
+void ssl_session_free( ssl_session *session )
+{
+ if( session == NULL )
+ return;
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+ if( session->peer_cert != NULL )
+ {
+ x509_crt_free( session->peer_cert );
+ polarssl_free( session->peer_cert );
+ }
+#endif
+
+#if defined(POLARSSL_SSL_SESSION_TICKETS)
+ polarssl_free( session->ticket );
+#endif
+
+ polarssl_zeroize( session, sizeof( ssl_session ) );
+}
+
+/*
+ * Free an SSL context
+ */
+void ssl_free( ssl_context *ssl )
+{
+ if( ssl == NULL )
+ return;
+
+ SSL_DEBUG_MSG( 2, ( "=> free" ) );
+
+ if( ssl->out_ctr != NULL )
+ {
+ polarssl_zeroize( ssl->out_ctr, SSL_BUFFER_LEN );
+ polarssl_free( ssl->out_ctr );
+ }
+
+ if( ssl->in_ctr != NULL )
+ {
+ polarssl_zeroize( ssl->in_ctr, SSL_BUFFER_LEN );
+ polarssl_free( ssl->in_ctr );
+ }
+
+#if defined(POLARSSL_ZLIB_SUPPORT)
+ if( ssl->compress_buf != NULL )
+ {
+ polarssl_zeroize( ssl->compress_buf, SSL_BUFFER_LEN );
+ polarssl_free( ssl->compress_buf );
+ }
+#endif
+
+#if defined(POLARSSL_DHM_C)
+ mpi_free( &ssl->dhm_P );
+ mpi_free( &ssl->dhm_G );
+#endif
+
+ if( ssl->transform )
+ {
+ ssl_transform_free( ssl->transform );
+ polarssl_free( ssl->transform );
+ }
+
+ if( ssl->handshake )
+ {
+ ssl_handshake_free( ssl->handshake );
+ ssl_transform_free( ssl->transform_negotiate );
+ ssl_session_free( ssl->session_negotiate );
+
+ polarssl_free( ssl->handshake );
+ polarssl_free( ssl->transform_negotiate );
+ polarssl_free( ssl->session_negotiate );
+ }
+
+ if( ssl->session )
+ {
+ ssl_session_free( ssl->session );
+ polarssl_free( ssl->session );
+ }
+
+#if defined(POLARSSL_SSL_SESSION_TICKETS)
+ if( ssl->ticket_keys )
+ {
+ ssl_ticket_keys_free( ssl->ticket_keys );
+ polarssl_free( ssl->ticket_keys );
+ }
+#endif
+
+#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
+ if( ssl->hostname != NULL )
+ {
+ polarssl_zeroize( ssl->hostname, ssl->hostname_len );
+ polarssl_free( ssl->hostname );
+ ssl->hostname_len = 0;
+ }
+#endif
+
+#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
+ if( ssl->psk != NULL )
+ {
+ polarssl_zeroize( ssl->psk, ssl->psk_len );
+ polarssl_zeroize( ssl->psk_identity, ssl->psk_identity_len );
+ polarssl_free( ssl->psk );
+ polarssl_free( ssl->psk_identity );
+ ssl->psk_len = 0;
+ ssl->psk_identity_len = 0;
+ }
+#endif
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+ ssl_key_cert_free( ssl->key_cert );
+#endif
+
+#if defined(POLARSSL_SSL_HW_RECORD_ACCEL)
+ if( ssl_hw_record_finish != NULL )
+ {
+ SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_finish()" ) );
+ ssl_hw_record_finish( ssl );
+ }
+#endif
+
+ SSL_DEBUG_MSG( 2, ( "<= free" ) );
+
+ /* Actually clear after last debug message */
+ polarssl_zeroize( ssl, sizeof( ssl_context ) );
+}
+
+#if defined(POLARSSL_PK_C)
+/*
+ * Convert between POLARSSL_PK_XXX and SSL_SIG_XXX
+ */
+unsigned char ssl_sig_from_pk( pk_context *pk )
+{
+#if defined(POLARSSL_RSA_C)
+ if( pk_can_do( pk, POLARSSL_PK_RSA ) )
+ return( SSL_SIG_RSA );
+#endif
+#if defined(POLARSSL_ECDSA_C)
+ if( pk_can_do( pk, POLARSSL_PK_ECDSA ) )
+ return( SSL_SIG_ECDSA );
+#endif
+ return( SSL_SIG_ANON );
+}
+
+pk_type_t ssl_pk_alg_from_sig( unsigned char sig )
+{
+ switch( sig )
+ {
+#if defined(POLARSSL_RSA_C)
+ case SSL_SIG_RSA:
+ return( POLARSSL_PK_RSA );
+#endif
+#if defined(POLARSSL_ECDSA_C)
+ case SSL_SIG_ECDSA:
+ return( POLARSSL_PK_ECDSA );
+#endif
+ default:
+ return( POLARSSL_PK_NONE );
+ }
+}
+#endif /* POLARSSL_PK_C */
+
+/*
+ * Convert between SSL_HASH_XXX and POLARSSL_MD_XXX
+ */
+md_type_t ssl_md_alg_from_hash( unsigned char hash )
+{
+ switch( hash )
+ {
+#if defined(POLARSSL_MD5_C)
+ case SSL_HASH_MD5:
+ return( POLARSSL_MD_MD5 );
+#endif
+#if defined(POLARSSL_SHA1_C)
+ case SSL_HASH_SHA1:
+ return( POLARSSL_MD_SHA1 );
+#endif
+#if defined(POLARSSL_SHA256_C)
+ case SSL_HASH_SHA224:
+ return( POLARSSL_MD_SHA224 );
+ case SSL_HASH_SHA256:
+ return( POLARSSL_MD_SHA256 );
+#endif
+#if defined(POLARSSL_SHA512_C)
+ case SSL_HASH_SHA384:
+ return( POLARSSL_MD_SHA384 );
+ case SSL_HASH_SHA512:
+ return( POLARSSL_MD_SHA512 );
+#endif
+ default:
+ return( POLARSSL_MD_NONE );
+ }
+}
+
+#if defined(POLARSSL_SSL_SET_CURVES)
+/*
+ * Check is a curve proposed by the peer is in our list.
+ * Return 1 if we're willing to use it, 0 otherwise.
+ */
+int ssl_curve_is_acceptable( const ssl_context *ssl, ecp_group_id grp_id )
+{
+ const ecp_group_id *gid;
+
+ for( gid = ssl->curve_list; *gid != POLARSSL_ECP_DP_NONE; gid++ )
+ if( *gid == grp_id )
+ return( 1 );
+
+ return( 0 );
+}
+#endif /* POLARSSL_SSL_SET_CURVES */
+
+#if defined(POLARSSL_X509_CRT_PARSE_C)
+int ssl_check_cert_usage( const x509_crt *cert,
+ const ssl_ciphersuite_t *ciphersuite,
+ int cert_endpoint,
+ int *flags )
+{
+ int ret = 0;
+#if defined(POLARSSL_X509_CHECK_KEY_USAGE)
+ int usage = 0;
+#endif
+#if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
+ const char *ext_oid;
+ size_t ext_len;
+#endif
+
+#if !defined(POLARSSL_X509_CHECK_KEY_USAGE) && \
+ !defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
+ ((void) cert);
+ ((void) cert_endpoint);
+ ((void) flags);
+#endif
+
+#if defined(POLARSSL_X509_CHECK_KEY_USAGE)
+ if( cert_endpoint == SSL_IS_SERVER )
+ {
+ /* Server part of the key exchange */
+ switch( ciphersuite->key_exchange )
+ {
+ case POLARSSL_KEY_EXCHANGE_RSA:
+ case POLARSSL_KEY_EXCHANGE_RSA_PSK:
+ usage = KU_KEY_ENCIPHERMENT;
+ break;
+
+ case POLARSSL_KEY_EXCHANGE_DHE_RSA:
+ case POLARSSL_KEY_EXCHANGE_ECDHE_RSA:
+ case POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA:
+ usage = KU_DIGITAL_SIGNATURE;
+ break;
+
+ case POLARSSL_KEY_EXCHANGE_ECDH_RSA:
+ case POLARSSL_KEY_EXCHANGE_ECDH_ECDSA:
+ usage = KU_KEY_AGREEMENT;
+ break;
+
+ /* Don't use default: we want warnings when adding new values */
+ case POLARSSL_KEY_EXCHANGE_NONE:
+ case POLARSSL_KEY_EXCHANGE_PSK:
+ case POLARSSL_KEY_EXCHANGE_DHE_PSK:
+ case POLARSSL_KEY_EXCHANGE_ECDHE_PSK:
+ usage = 0;
+ }
+ }
+ else
+ {
+ /* Client auth: we only implement rsa_sign and ecdsa_sign for now */
+ usage = KU_DIGITAL_SIGNATURE;
+ }
+
+ if( x509_crt_check_key_usage( cert, usage ) != 0 )
+ {
+ *flags |= BADCERT_KEY_USAGE;
+ ret = -1;
+ }
+#else
+ ((void) ciphersuite);
+#endif /* POLARSSL_X509_CHECK_KEY_USAGE */
+
+#if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
+ if( cert_endpoint == SSL_IS_SERVER )
+ {
+ ext_oid = OID_SERVER_AUTH;
+ ext_len = OID_SIZE( OID_SERVER_AUTH );
+ }
+ else
+ {
+ ext_oid = OID_CLIENT_AUTH;
+ ext_len = OID_SIZE( OID_CLIENT_AUTH );
+ }
+
+ if( x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
+ {
+ *flags |= BADCERT_EXT_KEY_USAGE;
+ ret = -1;
+ }
+#endif /* POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE */
+
+ return( ret );
+}
+#endif /* POLARSSL_X509_CRT_PARSE_C */
+
+#endif /* POLARSSL_SSL_TLS_C */
+