t1_lib.c 48.9 KB
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/* ssl/t1_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
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/* ====================================================================
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 * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
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#include <stdio.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
#include <openssl/hmac.h>
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#include <openssl/ocsp.h>
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#include "ssl_locl.h"

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const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
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#ifndef OPENSSL_NO_TLSEXT
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static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
				const unsigned char *sess_id, int sesslen,
				SSL_SESSION **psess);
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#endif
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SSL3_ENC_METHOD TLSv1_enc_data={
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	tls1_enc,
	tls1_mac,
	tls1_setup_key_block,
	tls1_generate_master_secret,
	tls1_change_cipher_state,
	tls1_final_finish_mac,
	TLS1_FINISH_MAC_LENGTH,
	tls1_cert_verify_mac,
	TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
	TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
	tls1_alert_code,
	};

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long tls1_default_timeout(void)
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	{
	/* 2 hours, the 24 hours mentioned in the TLSv1 spec
	 * is way too long for http, the cache would over fill */
	return(60*60*2);
	}

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int tls1_new(SSL *s)
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	{
	if (!ssl3_new(s)) return(0);
	s->method->ssl_clear(s);
	return(1);
	}

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void tls1_free(SSL *s)
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	{
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#ifndef OPENSSL_NO_TLSEXT
	if (s->tlsext_session_ticket)
		{
		OPENSSL_free(s->tlsext_session_ticket);
		}
#endif /* OPENSSL_NO_TLSEXT */
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	ssl3_free(s);
	}

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void tls1_clear(SSL *s)
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	{
	ssl3_clear(s);
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	s->version = s->method->version;
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	}

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#ifndef OPENSSL_NO_EC
static int nid_list[] =
	{
		NID_sect163k1, /* sect163k1 (1) */
		NID_sect163r1, /* sect163r1 (2) */
		NID_sect163r2, /* sect163r2 (3) */
		NID_sect193r1, /* sect193r1 (4) */ 
		NID_sect193r2, /* sect193r2 (5) */ 
		NID_sect233k1, /* sect233k1 (6) */
		NID_sect233r1, /* sect233r1 (7) */ 
		NID_sect239k1, /* sect239k1 (8) */ 
		NID_sect283k1, /* sect283k1 (9) */
		NID_sect283r1, /* sect283r1 (10) */ 
		NID_sect409k1, /* sect409k1 (11) */ 
		NID_sect409r1, /* sect409r1 (12) */
		NID_sect571k1, /* sect571k1 (13) */ 
		NID_sect571r1, /* sect571r1 (14) */ 
		NID_secp160k1, /* secp160k1 (15) */
		NID_secp160r1, /* secp160r1 (16) */ 
		NID_secp160r2, /* secp160r2 (17) */ 
		NID_secp192k1, /* secp192k1 (18) */
		NID_X9_62_prime192v1, /* secp192r1 (19) */ 
		NID_secp224k1, /* secp224k1 (20) */ 
		NID_secp224r1, /* secp224r1 (21) */
		NID_secp256k1, /* secp256k1 (22) */ 
		NID_X9_62_prime256v1, /* secp256r1 (23) */ 
		NID_secp384r1, /* secp384r1 (24) */
		NID_secp521r1  /* secp521r1 (25) */	
	};
	
int tls1_ec_curve_id2nid(int curve_id)
	{
	/* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
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	if ((curve_id < 1) || ((unsigned int)curve_id >
				sizeof(nid_list)/sizeof(nid_list[0])))
		return 0;
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	return nid_list[curve_id-1];
	}

int tls1_ec_nid2curve_id(int nid)
	{
	/* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
	switch (nid)
		{
	case NID_sect163k1: /* sect163k1 (1) */
		return 1;
	case NID_sect163r1: /* sect163r1 (2) */
		return 2;
	case NID_sect163r2: /* sect163r2 (3) */
		return 3;
	case NID_sect193r1: /* sect193r1 (4) */ 
		return 4;
	case NID_sect193r2: /* sect193r2 (5) */ 
		return 5;
	case NID_sect233k1: /* sect233k1 (6) */
		return 6;
	case NID_sect233r1: /* sect233r1 (7) */ 
		return 7;
	case NID_sect239k1: /* sect239k1 (8) */ 
		return 8;
	case NID_sect283k1: /* sect283k1 (9) */
		return 9;
	case NID_sect283r1: /* sect283r1 (10) */ 
		return 10;
	case NID_sect409k1: /* sect409k1 (11) */ 
		return 11;
	case NID_sect409r1: /* sect409r1 (12) */
		return 12;
	case NID_sect571k1: /* sect571k1 (13) */ 
		return 13;
	case NID_sect571r1: /* sect571r1 (14) */ 
		return 14;
	case NID_secp160k1: /* secp160k1 (15) */
		return 15;
	case NID_secp160r1: /* secp160r1 (16) */ 
		return 16;
	case NID_secp160r2: /* secp160r2 (17) */ 
		return 17;
	case NID_secp192k1: /* secp192k1 (18) */
		return 18;
	case NID_X9_62_prime192v1: /* secp192r1 (19) */ 
		return 19;
	case NID_secp224k1: /* secp224k1 (20) */ 
		return 20;
	case NID_secp224r1: /* secp224r1 (21) */
		return 21;
	case NID_secp256k1: /* secp256k1 (22) */ 
		return 22;
	case NID_X9_62_prime256v1: /* secp256r1 (23) */ 
		return 23;
	case NID_secp384r1: /* secp384r1 (24) */
		return 24;
	case NID_secp521r1:  /* secp521r1 (25) */	
		return 25;
	default:
		return 0;
		}
	}
#endif /* OPENSSL_NO_EC */
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#ifndef OPENSSL_NO_TLSEXT
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unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
	{
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	int extdatalen=0;
	unsigned char *ret = p;

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	/* don't add extensions for SSLv3 unless doing secure renegotiation */
	if (s->client_version == SSL3_VERSION
					&& !s->s3->send_connection_binding)
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		return p;

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	ret+=2;

	if (ret>=limit) return NULL; /* this really never occurs, but ... */
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 	if (s->tlsext_hostname != NULL)
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		{ 
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		/* Add TLS extension servername to the Client Hello message */
		unsigned long size_str;
		long lenmax; 

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		/* check for enough space.
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		   4 for the servername type and entension length
		   2 for servernamelist length
		   1 for the hostname type
		   2 for hostname length
		   + hostname length 
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		*/
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		if ((lenmax = limit - ret - 9) < 0 
		    || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) 
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			return NULL;
			
		/* extension type and length */
		s2n(TLSEXT_TYPE_server_name,ret); 
		s2n(size_str+5,ret);
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		/* length of servername list */
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		s2n(size_str+3,ret);
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		/* hostname type, length and hostname */
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		*(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
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		s2n(size_str,ret);
		memcpy(ret, s->tlsext_hostname, size_str);
		ret+=size_str;
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		}
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        /* Add the renegotiation option: TODOEKR switch */
        {
          int el;
          
          if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
              {
              SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
              return NULL;
              }

          if((limit - p - 4 - el) < 0) return NULL;
          
          s2n(TLSEXT_TYPE_renegotiate,ret);
          s2n(el,ret);

          if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
              {
              SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
              return NULL;
              }

          ret += el;
        }

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#ifndef OPENSSL_NO_EC
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	if (s->tlsext_ecpointformatlist != NULL &&
	    s->version != DTLS1_VERSION)
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		{
		/* Add TLS extension ECPointFormats to the ClientHello message */
		long lenmax; 

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		if ((lenmax = limit - ret - 5) < 0) return NULL; 
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		if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
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		if (s->tlsext_ecpointformatlist_length > 255)
			{
			SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
			return NULL;
			}
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		s2n(TLSEXT_TYPE_ec_point_formats,ret);
		s2n(s->tlsext_ecpointformatlist_length + 1,ret);
		*(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
		memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
		ret+=s->tlsext_ecpointformatlist_length;
		}
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	if (s->tlsext_ellipticcurvelist != NULL &&
	    s->version != DTLS1_VERSION)
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		{
		/* Add TLS extension EllipticCurves to the ClientHello message */
		long lenmax; 

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		if ((lenmax = limit - ret - 6) < 0) return NULL; 
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		if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
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		if (s->tlsext_ellipticcurvelist_length > 65532)
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			{
			SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
			return NULL;
			}
		
		s2n(TLSEXT_TYPE_elliptic_curves,ret);
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		s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
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		/* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
		 * elliptic_curve_list, but the examples use two bytes.
		 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
		 * resolves this to two bytes.
		 */
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		s2n(s->tlsext_ellipticcurvelist_length, ret);
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		memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
		ret+=s->tlsext_ellipticcurvelist_length;
		}
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#endif /* OPENSSL_NO_EC */
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	if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
		{
		int ticklen;
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		if (!s->new_session && s->session && s->session->tlsext_tick)
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			ticklen = s->session->tlsext_ticklen;
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		else if (s->session && s->tlsext_session_ticket &&
			 s->tlsext_session_ticket->data)
			{
			ticklen = s->tlsext_session_ticket->length;
			s->session->tlsext_tick = OPENSSL_malloc(ticklen);
			if (!s->session->tlsext_tick)
				return NULL;
			memcpy(s->session->tlsext_tick,
			       s->tlsext_session_ticket->data,
			       ticklen);
			s->session->tlsext_ticklen = ticklen;
			}
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		else
			ticklen = 0;
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		if (ticklen == 0 && s->tlsext_session_ticket &&
		    s->tlsext_session_ticket->data == NULL)
			goto skip_ext;
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		/* Check for enough room 2 for extension type, 2 for len
 		 * rest for ticket
  		 */
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		if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
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		s2n(TLSEXT_TYPE_session_ticket,ret); 
		s2n(ticklen,ret);
		if (ticklen)
			{
			memcpy(ret, s->session->tlsext_tick, ticklen);
			ret += ticklen;
			}
		}
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		skip_ext:
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#ifdef TLSEXT_TYPE_opaque_prf_input
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	if (s->s3->client_opaque_prf_input != NULL &&
	    s->version != DTLS1_VERSION)
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		{
		size_t col = s->s3->client_opaque_prf_input_len;
		
		if ((long)(limit - ret - 6 - col < 0))
			return NULL;
		if (col > 0xFFFD) /* can't happen */
			return NULL;

		s2n(TLSEXT_TYPE_opaque_prf_input, ret); 
		s2n(col + 2, ret);
		s2n(col, ret);
		memcpy(ret, s->s3->client_opaque_prf_input, col);
		ret += col;
		}
#endif

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	if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
	    s->version != DTLS1_VERSION)
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		{
		int i;
		long extlen, idlen, itmp;
		OCSP_RESPID *id;

		idlen = 0;
		for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
			{
			id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
			itmp = i2d_OCSP_RESPID(id, NULL);
			if (itmp <= 0)
				return NULL;
			idlen += itmp + 2;
			}

		if (s->tlsext_ocsp_exts)
			{
			extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
			if (extlen < 0)
				return NULL;
			}
		else
			extlen = 0;
			
		if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
		s2n(TLSEXT_TYPE_status_request, ret);
		if (extlen + idlen > 0xFFF0)
			return NULL;
		s2n(extlen + idlen + 5, ret);
		*(ret++) = TLSEXT_STATUSTYPE_ocsp;
		s2n(idlen, ret);
		for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
			{
			/* save position of id len */
			unsigned char *q = ret;
			id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
			/* skip over id len */
			ret += 2;
			itmp = i2d_OCSP_RESPID(id, &ret);
			/* write id len */
			s2n(itmp, q);
			}
		s2n(extlen, ret);
		if (extlen > 0)
			i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
		}

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	if ((extdatalen = ret-p-2)== 0) 
		return p;

	s2n(extdatalen,p);
	return ret;
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	}
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unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
	{
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	int extdatalen=0;
	unsigned char *ret = p;

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	/* don't add extensions for SSLv3, unless doing secure renegotiation */
	if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
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		return p;
	
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	ret+=2;
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	if (ret>=limit) return NULL; /* this really never occurs, but ... */

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	if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
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		{ 
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		if ((long)(limit - ret - 4) < 0) return NULL; 
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		s2n(TLSEXT_TYPE_server_name,ret);
		s2n(0,ret);
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		}
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	if(s->s3->send_connection_binding)
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        {
          int el;
          
          if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
              {
              SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
              return NULL;
              }

          if((limit - p - 4 - el) < 0) return NULL;
          
          s2n(TLSEXT_TYPE_renegotiate,ret);
          s2n(el,ret);

          if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
              {
              SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
              return NULL;
              }

          ret += el;
        }

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#ifndef OPENSSL_NO_EC
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	if (s->tlsext_ecpointformatlist != NULL &&
	    s->version != DTLS1_VERSION)
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		{
		/* Add TLS extension ECPointFormats to the ServerHello message */
		long lenmax; 

554
		if ((lenmax = limit - ret - 5) < 0) return NULL; 
555
		if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
B
Bodo Möller 已提交
556 557 558 559 560
		if (s->tlsext_ecpointformatlist_length > 255)
			{
			SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
			return NULL;
			}
561 562 563 564 565 566
		
		s2n(TLSEXT_TYPE_ec_point_formats,ret);
		s2n(s->tlsext_ecpointformatlist_length + 1,ret);
		*(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
		memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
		ret+=s->tlsext_ecpointformatlist_length;
B
Bodo Möller 已提交
567

568
		}
569
	/* Currently the server should not respond with a SupportedCurves extension */
570
#endif /* OPENSSL_NO_EC */
571

572 573 574
	if (s->tlsext_ticket_expected
		&& !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 
		{ 
575
		if ((long)(limit - ret - 4) < 0) return NULL; 
576 577 578
		s2n(TLSEXT_TYPE_session_ticket,ret);
		s2n(0,ret);
		}
579

580 581 582 583 584 585 586
	if (s->tlsext_status_expected)
		{ 
		if ((long)(limit - ret - 4) < 0) return NULL; 
		s2n(TLSEXT_TYPE_status_request,ret);
		s2n(0,ret);
		}

587
#ifdef TLSEXT_TYPE_opaque_prf_input
D
Dr. Stephen Henson 已提交
588 589
	if (s->s3->server_opaque_prf_input != NULL &&
	    s->version != DTLS1_VERSION)
590 591
		{
		size_t sol = s->s3->server_opaque_prf_input_len;
592
		
593 594 595 596 597 598 599 600 601 602 603 604
		if ((long)(limit - ret - 6 - sol) < 0)
			return NULL;
		if (sol > 0xFFFD) /* can't happen */
			return NULL;

		s2n(TLSEXT_TYPE_opaque_prf_input, ret); 
		s2n(sol + 2, ret);
		s2n(sol, ret);
		memcpy(ret, s->s3->server_opaque_prf_input, sol);
		ret += sol;
		}
#endif
605 606 607 608 609 610 611 612 613 614 615 616 617 618
	if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81) 
		&& (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
		{ const unsigned char cryptopro_ext[36] = {
			0xfd, 0xe8, /*65000*/
			0x00, 0x20, /*32 bytes length*/
			0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85, 
			0x03,   0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06, 
			0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08, 
			0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
			if (limit-ret<36) return NULL;
			memcpy(ret,cryptopro_ext,36);
			ret+=36;

		}
619

620 621 622 623 624
	if ((extdatalen = ret-p-2)== 0) 
		return p;

	s2n(extdatalen,p);
	return ret;
625
	}
626

627 628
int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
	{
629 630 631
	unsigned short type;
	unsigned short size;
	unsigned short len;
632
	unsigned char *data = *p;
633 634
	int renegotiate_seen = 0;

B
Bodo Möller 已提交
635
	s->servername_done = 0;
636
	s->tlsext_status_type = -1;
637 638

	if (data >= (d+n-2))
639
		goto ri_check;
640 641
	n2s(data,len);

642
	if (data > (d+n-len)) 
643
		goto ri_check;
644

645 646
	while (data <= (d+n-4))
		{
647 648 649 650
		n2s(data,type);
		n2s(data,size);

		if (data+size > (d+n))
651
	   		goto ri_check;
D
Dr. Stephen Henson 已提交
652
#if 0
653
		fprintf(stderr,"Received extension type %d size %d\n",type,size);
D
Dr. Stephen Henson 已提交
654
#endif
655 656 657
		if (s->tlsext_debug_cb)
			s->tlsext_debug_cb(s, 0, type, data, size,
						s->tlsext_debug_arg);
B
Bodo Möller 已提交
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
/* The servername extension is treated as follows:

   - Only the hostname type is supported with a maximum length of 255.
   - The servername is rejected if too long or if it contains zeros,
     in which case an fatal alert is generated.
   - The servername field is maintained together with the session cache.
   - When a session is resumed, the servername call back invoked in order
     to allow the application to position itself to the right context. 
   - The servername is acknowledged if it is new for a session or when 
     it is identical to a previously used for the same session. 
     Applications can control the behaviour.  They can at any time
     set a 'desirable' servername for a new SSL object. This can be the
     case for example with HTTPS when a Host: header field is received and
     a renegotiation is requested. In this case, a possible servername
     presented in the new client hello is only acknowledged if it matches
     the value of the Host: field. 
   - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
     if they provide for changing an explicit servername context for the session,
     i.e. when the session has been established with a servername extension. 
   - On session reconnect, the servername extension may be absent. 

*/      

681 682
		if (type == TLSEXT_TYPE_server_name)
			{
B
Bodo Möller 已提交
683
			unsigned char *sdata;
684
			int servname_type;
B
Bodo Möller 已提交
685 686 687 688 689 690 691 692
			int dsize; 
		
			if (size < 2) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			n2s(data,dsize);  
693
			size -= 2;
B
Bodo Möller 已提交
694
			if (dsize > size  ) 
695
				{
B
Bodo Möller 已提交
696 697 698 699 700 701 702 703
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				} 

			sdata = data;
			while (dsize > 3) 
				{
	 			servname_type = *(sdata++); 
704
				n2s(sdata,len);
B
Bodo Möller 已提交
705 706 707
				dsize -= 3;

				if (len > dsize) 
708 709 710 711
					{
					*al = SSL_AD_DECODE_ERROR;
					return 0;
					}
B
Bodo Möller 已提交
712
				if (s->servername_done == 0)
713 714 715
				switch (servname_type)
					{
				case TLSEXT_NAMETYPE_host_name:
716
					if (s->session->tlsext_hostname == NULL)
717
						{
B
Bodo Möller 已提交
718
						if (len > TLSEXT_MAXLEN_host_name || 
719
							((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
720 721 722 723
							{
							*al = TLS1_AD_UNRECOGNIZED_NAME;
							return 0;
							}
724
						memcpy(s->session->tlsext_hostname, sdata, len);
B
Bodo Möller 已提交
725 726 727
						s->session->tlsext_hostname[len]='\0';
						if (strlen(s->session->tlsext_hostname) != len) {
							OPENSSL_free(s->session->tlsext_hostname);
B
Bodo Möller 已提交
728
							s->session->tlsext_hostname = NULL;
B
Bodo Möller 已提交
729 730
							*al = TLS1_AD_UNRECOGNIZED_NAME;
							return 0;
731
						}
B
Bodo Möller 已提交
732 733 734 735 736
						s->servername_done = 1; 

						}
					else 
						s->servername_done = strlen(s->session->tlsext_hostname) == len 
R
Richard Levitte 已提交
737
							&& strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
B
Bodo Möller 已提交
738
					
739
					break;
740

741 742
				default:
					break;
743
					}
744
				 
B
Bodo Möller 已提交
745
				dsize -= len;
746
				}
B
Bodo Möller 已提交
747 748 749 750 751 752
			if (dsize != 0) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}

753 754
			}

755
#ifndef OPENSSL_NO_EC
D
Dr. Stephen Henson 已提交
756 757
		else if (type == TLSEXT_TYPE_ec_point_formats &&
	             s->version != DTLS1_VERSION)
758 759 760 761 762 763 764 765 766 767
			{
			unsigned char *sdata = data;
			int ecpointformatlist_length = *(sdata++);

			if (ecpointformatlist_length != size - 1)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			s->session->tlsext_ecpointformatlist_length = 0;
768
			if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
769 770 771 772 773 774 775 776 777 778 779 780 781
			if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
			memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
#if 0
			fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
			sdata = s->session->tlsext_ecpointformatlist;
			for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
				fprintf(stderr,"%i ",*(sdata++));
			fprintf(stderr,"\n");
782 783
#endif
			}
D
Dr. Stephen Henson 已提交
784 785
		else if (type == TLSEXT_TYPE_elliptic_curves &&
	             s->version != DTLS1_VERSION)
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
			{
			unsigned char *sdata = data;
			int ellipticcurvelist_length = (*(sdata++) << 8);
			ellipticcurvelist_length += (*(sdata++));

			if (ellipticcurvelist_length != size - 2)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			s->session->tlsext_ellipticcurvelist_length = 0;
			if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
			if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
			memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
#if 0
			fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
			sdata = s->session->tlsext_ellipticcurvelist;
			for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
				fprintf(stderr,"%i ",*(sdata++));
			fprintf(stderr,"\n");
811 812
#endif
			}
N
Nils Larsch 已提交
813
#endif /* OPENSSL_NO_EC */
814
#ifdef TLSEXT_TYPE_opaque_prf_input
D
Dr. Stephen Henson 已提交
815 816
		else if (type == TLSEXT_TYPE_opaque_prf_input &&
	             s->version != DTLS1_VERSION)
817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
			{
			unsigned char *sdata = data;

			if (size < 2)
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			n2s(sdata, s->s3->client_opaque_prf_input_len);
			if (s->s3->client_opaque_prf_input_len != size - 2)
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}

			if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
				OPENSSL_free(s->s3->client_opaque_prf_input);
834 835 836 837
			if (s->s3->client_opaque_prf_input_len == 0)
				s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
			else
				s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
838 839 840 841 842 843 844
			if (s->s3->client_opaque_prf_input == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			}
#endif
D
Dr. Stephen Henson 已提交
845 846 847 848 849 850 851 852 853
		else if (type == TLSEXT_TYPE_session_ticket)
			{
			if (s->tls_session_ticket_ext_cb &&
			    !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			}
854 855 856 857 858 859
		else if (type == TLSEXT_TYPE_renegotiate)
			{
			if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
				return 0;
			renegotiate_seen = 1;
			}
D
Dr. Stephen Henson 已提交
860 861
		else if (type == TLSEXT_TYPE_status_request &&
		         s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959
			{
		
			if (size < 5) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}

			s->tlsext_status_type = *data++;
			size--;
			if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
				{
				const unsigned char *sdata;
				int dsize;
				/* Read in responder_id_list */
				n2s(data,dsize);
				size -= 2;
				if (dsize > size  ) 
					{
					*al = SSL_AD_DECODE_ERROR;
					return 0;
					}
				while (dsize > 0)
					{
					OCSP_RESPID *id;
					int idsize;
					if (dsize < 4)
						{
						*al = SSL_AD_DECODE_ERROR;
						return 0;
						}
					n2s(data, idsize);
					dsize -= 2 + idsize;
					if (dsize < 0)
						{
						*al = SSL_AD_DECODE_ERROR;
						return 0;
						}
					sdata = data;
					data += idsize;
					id = d2i_OCSP_RESPID(NULL,
								&sdata, idsize);
					if (!id)
						{
						*al = SSL_AD_DECODE_ERROR;
						return 0;
						}
					if (data != sdata)
						{
						OCSP_RESPID_free(id);
						*al = SSL_AD_DECODE_ERROR;
						return 0;
						}
					if (!s->tlsext_ocsp_ids
						&& !(s->tlsext_ocsp_ids =
						sk_OCSP_RESPID_new_null()))
						{
						OCSP_RESPID_free(id);
						*al = SSL_AD_INTERNAL_ERROR;
						return 0;
						}
					if (!sk_OCSP_RESPID_push(
							s->tlsext_ocsp_ids, id))
						{
						OCSP_RESPID_free(id);
						*al = SSL_AD_INTERNAL_ERROR;
						return 0;
						}
					}

				/* Read in request_extensions */
				n2s(data,dsize);
				size -= 2;
				if (dsize > size) 
					{
					*al = SSL_AD_DECODE_ERROR;
					return 0;
					}
				sdata = data;
				if (dsize > 0)
					{
					s->tlsext_ocsp_exts =
						d2i_X509_EXTENSIONS(NULL,
							&sdata, dsize);
					if (!s->tlsext_ocsp_exts
						|| (data + dsize != sdata))
						{
						*al = SSL_AD_DECODE_ERROR;
						return 0;
						}
					}
				}
				/* We don't know what to do with any other type
 			 	* so ignore it.
 			 	*/
				else
					s->tlsext_status_type = -1;
			}
960

961 962
		/* session ticket processed earlier */
		data+=size;
963
		}
964
				
965
	*p = data;
966 967 968 969 970 971 972 973

	ri_check:

	/* Need RI if renegotiating */

	if (!renegotiate_seen && s->new_session &&
		!(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
		{
974
		*al = SSL_AD_HANDSHAKE_FAILURE;
975 976 977 978 979
	 	SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
				SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
		return 0;
		}

980
	return 1;
981
	}
982 983 984

int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
	{
985 986 987 988 989
	unsigned short type;
	unsigned short size;
	unsigned short len;  
	unsigned char *data = *p;
	int tlsext_servername = 0;
990
	int renegotiate_seen = 0;
991 992

	if (data >= (d+n-2))
993
		goto ri_check;
994 995 996

	n2s(data,len);

997 998
	while(data <= (d+n-4))
		{
999 1000 1001 1002
		n2s(data,type);
		n2s(data,size);

		if (data+size > (d+n))
1003
	   		goto ri_check;
1004

1005 1006 1007 1008
		if (s->tlsext_debug_cb)
			s->tlsext_debug_cb(s, 1, type, data, size,
						s->tlsext_debug_arg);

1009 1010 1011 1012 1013 1014 1015
		if (type == TLSEXT_TYPE_server_name)
			{
			if (s->tlsext_hostname == NULL || size > 0)
				{
				*al = TLS1_AD_UNRECOGNIZED_NAME;
				return 0;
				}
1016
			tlsext_servername = 1;   
1017
			}
1018

1019
#ifndef OPENSSL_NO_EC
D
Dr. Stephen Henson 已提交
1020 1021
		else if (type == TLSEXT_TYPE_ec_point_formats &&
	             s->version != DTLS1_VERSION)
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
			{
			unsigned char *sdata = data;
			int ecpointformatlist_length = *(sdata++);

			if (ecpointformatlist_length != size - 1)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			s->session->tlsext_ecpointformatlist_length = 0;
1032
			if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
			if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
			memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
#if 0
			fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
			sdata = s->session->tlsext_ecpointformatlist;
			for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
				fprintf(stderr,"%i ",*(sdata++));
			fprintf(stderr,"\n");
#endif
			}
N
Nils Larsch 已提交
1048
#endif /* OPENSSL_NO_EC */
1049 1050 1051

		else if (type == TLSEXT_TYPE_session_ticket)
			{
D
Dr. Stephen Henson 已提交
1052 1053 1054 1055 1056 1057
			if (s->tls_session_ticket_ext_cb &&
			    !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
1058 1059 1060 1061 1062 1063 1064 1065
			if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
				|| (size > 0))
				{
				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
				return 0;
				}
			s->tlsext_ticket_expected = 1;
			}
1066
#ifdef TLSEXT_TYPE_opaque_prf_input
D
Dr. Stephen Henson 已提交
1067 1068
		else if (type == TLSEXT_TYPE_opaque_prf_input &&
	             s->version != DTLS1_VERSION)
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
			{
			unsigned char *sdata = data;

			if (size < 2)
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			n2s(sdata, s->s3->server_opaque_prf_input_len);
			if (s->s3->server_opaque_prf_input_len != size - 2)
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			
			if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
				OPENSSL_free(s->s3->server_opaque_prf_input);
1086 1087 1088 1089
			if (s->s3->server_opaque_prf_input_len == 0)
				s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
			else
				s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1090 1091 1092 1093 1094 1095 1096 1097

			if (s->s3->server_opaque_prf_input == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			}
#endif
D
Dr. Stephen Henson 已提交
1098 1099
		else if (type == TLSEXT_TYPE_status_request &&
		         s->version != DTLS1_VERSION)
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
			{
			/* MUST be empty and only sent if we've requested
			 * a status request message.
			 */ 
			if ((s->tlsext_status_type == -1) || (size > 0))
				{
				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
				return 0;
				}
			/* Set flag to expect CertificateStatus message */
			s->tlsext_status_expected = 1;
			}
1112 1113 1114 1115 1116 1117
		else if (type == TLSEXT_TYPE_renegotiate)
			{
			if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
				return 0;
			renegotiate_seen = 1;
			}
1118
		data+=size;		
1119
		}
1120 1121

	if (data != d+n)
1122 1123 1124 1125
		{
		*al = SSL_AD_DECODE_ERROR;
		return 0;
		}
1126

1127 1128 1129 1130 1131 1132
	if (!s->hit && tlsext_servername == 1)
		{
 		if (s->tlsext_hostname)
			{
			if (s->session->tlsext_hostname == NULL)
				{
1133 1134
				s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);	
				if (!s->session->tlsext_hostname)
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
					{
					*al = SSL_AD_UNRECOGNIZED_NAME;
					return 0;
					}
				}
			else 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
1145
			}
1146
		}
1147

1148
	*p = data;
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158

	ri_check:

	/* Determine if we need to see RI. Strictly speaking if we want to
	 * avoid an attack we should *always* see RI even on initial server
	 * hello because the client doesn't see any renegotiation during an
	 * attack. However this would mean we could not connect to any server
	 * which doesn't support RI so for the immediate future tolerate RI
	 * absence on initial connect only.
	 */
1159 1160 1161
	if (!renegotiate_seen && 
		(s->new_session || !(s->options & SSL_OP_LEGACY_SERVER_CONNECT))
		&& !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1162
		{
1163
		*al = SSL_AD_HANDSHAKE_FAILURE;
1164 1165 1166 1167 1168
		SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
				SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
		return 0;
		}

1169
	return 1;
1170
	}
1171

1172

1173 1174 1175
int ssl_prepare_clienthello_tlsext(SSL *s)
	{
#ifndef OPENSSL_NO_EC
1176 1177
	/* If we are client and using an elliptic curve cryptography cipher suite, send the point formats 
	 * and elliptic curves we support.
1178 1179 1180
	 */
	int using_ecc = 0;
	int i;
1181
	unsigned char *j;
1182
	unsigned long alg_k, alg_a;
1183
	STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1184

1185 1186
	for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
		{
1187 1188 1189 1190 1191
		SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);

		alg_k = c->algorithm_mkey;
		alg_a = c->algorithm_auth;
		if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1192 1193 1194 1195 1196 1197 1198 1199
			{
			using_ecc = 1;
			break;
			}
		}
	using_ecc = using_ecc && (s->version == TLS1_VERSION);
	if (using_ecc)
		{
1200 1201
		if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
		if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1202
			{
B
Bodo Möller 已提交
1203
			SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1204 1205
			return -1;
			}
1206 1207 1208 1209
		s->tlsext_ecpointformatlist_length = 3;
		s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
		s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
		s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1210

1211 1212
		/* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
		if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1213 1214
		s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
		if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1215
			{
1216
			s->tlsext_ellipticcurvelist_length = 0;
B
Bodo Möller 已提交
1217
			SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1218 1219
			return -1;
			}
1220 1221
		for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
				sizeof(nid_list)/sizeof(nid_list[0]); i++)
1222
			s2n(i,j);
1223 1224
		}
#endif /* OPENSSL_NO_EC */
1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241

#ifdef TLSEXT_TYPE_opaque_prf_input
 	{
		int r = 1;
	
		if (s->ctx->tlsext_opaque_prf_input_callback != 0)
			{
			r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
			if (!r)
				return -1;
			}

		if (s->tlsext_opaque_prf_input != NULL)
			{
			if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
				OPENSSL_free(s->s3->client_opaque_prf_input);

1242 1243 1244 1245
			if (s->tlsext_opaque_prf_input_len == 0)
				s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
			else
				s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
			if (s->s3->client_opaque_prf_input == NULL)
				{
				SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
				return -1;
				}
			s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
			}

		if (r == 2)
			/* at callback's request, insist on receiving an appropriate server opaque PRF input */
			s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
	}
#endif

1260
	return 1;
1261
	}
1262 1263 1264 1265

int ssl_prepare_serverhello_tlsext(SSL *s)
	{
#ifndef OPENSSL_NO_EC
1266
	/* If we are server and using an ECC cipher suite, send the point formats we support 
1267 1268
	 * if the client sent us an ECPointsFormat extension.  Note that the server is not
	 * supposed to send an EllipticCurves extension.
1269 1270
	 */

1271 1272 1273 1274 1275
	unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
	unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
	int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
	using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
	
1276 1277
	if (using_ecc)
		{
1278 1279
		if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
		if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1280
			{
B
Bodo Möller 已提交
1281
			SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1282 1283
			return -1;
			}
1284 1285 1286 1287
		s->tlsext_ecpointformatlist_length = 3;
		s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
		s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
		s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1288 1289
		}
#endif /* OPENSSL_NO_EC */
1290

1291
	return 1;
1292
	}
1293 1294

int ssl_check_clienthello_tlsext(SSL *s)
1295
	{
1296
	int ret=SSL_TLSEXT_ERR_NOACK;
1297 1298 1299
	int al = SSL_AD_UNRECOGNIZED_NAME;

#ifndef OPENSSL_NO_EC
1300 1301 1302 1303 1304
	/* The handling of the ECPointFormats extension is done elsewhere, namely in 
	 * ssl3_choose_cipher in s3_lib.c.
	 */
	/* The handling of the EllipticCurves extension is done elsewhere, namely in 
	 * ssl3_choose_cipher in s3_lib.c.
1305 1306 1307 1308 1309 1310 1311 1312
	 */
#endif

	if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 
		ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
	else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 		
		ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);

1313 1314 1315 1316
	/* If status request then ask callback what to do.
 	 * Note: this must be called after servername callbacks in case 
 	 * the certificate has changed.
 	 */
1317
	if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342
		{
		int r;
		r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
		switch (r)
			{
			/* We don't want to send a status request response */
			case SSL_TLSEXT_ERR_NOACK:
				s->tlsext_status_expected = 0;
				break;
			/* status request response should be sent */
			case SSL_TLSEXT_ERR_OK:
				if (s->tlsext_ocsp_resp)
					s->tlsext_status_expected = 1;
				else
					s->tlsext_status_expected = 0;
				break;
			/* something bad happened */
			case SSL_TLSEXT_ERR_ALERT_FATAL:
				ret = SSL_TLSEXT_ERR_ALERT_FATAL;
				al = SSL_AD_INTERNAL_ERROR;
				goto err;
			}
		}
	else
		s->tlsext_status_expected = 0;
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374

#ifdef TLSEXT_TYPE_opaque_prf_input
 	{
		/* This sort of belongs into ssl_prepare_serverhello_tlsext(),
		 * but we might be sending an alert in response to the client hello,
		 * so this has to happen here in ssl_check_clienthello_tlsext(). */

		int r = 1;
	
		if (s->ctx->tlsext_opaque_prf_input_callback != 0)
			{
			r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
			if (!r)
				{
				ret = SSL_TLSEXT_ERR_ALERT_FATAL;
				al = SSL_AD_INTERNAL_ERROR;
				goto err;
				}
			}

		if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
			OPENSSL_free(s->s3->server_opaque_prf_input);
		s->s3->server_opaque_prf_input = NULL;

		if (s->tlsext_opaque_prf_input != NULL)
			{
			if (s->s3->client_opaque_prf_input != NULL &&
				s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
				{
				/* can only use this extension if we have a server opaque PRF input
				 * of the same length as the client opaque PRF input! */

1375 1376 1377 1378
				if (s->tlsext_opaque_prf_input_len == 0)
					s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
				else
					s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399
				if (s->s3->server_opaque_prf_input == NULL)
					{
					ret = SSL_TLSEXT_ERR_ALERT_FATAL;
					al = SSL_AD_INTERNAL_ERROR;
					goto err;
					}
				s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
				}
			}

		if (r == 2 && s->s3->server_opaque_prf_input == NULL)
			{
			/* The callback wants to enforce use of the extension,
			 * but we can't do that with the client opaque PRF input;
			 * abort the handshake.
			 */
			ret = SSL_TLSEXT_ERR_ALERT_FATAL;
			al = SSL_AD_HANDSHAKE_FAILURE;
			}
	}

1400
#endif
1401
 err:
1402 1403
	switch (ret)
		{
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
		case SSL_TLSEXT_ERR_ALERT_FATAL:
			ssl3_send_alert(s,SSL3_AL_FATAL,al); 
			return -1;

		case SSL_TLSEXT_ERR_ALERT_WARNING:
			ssl3_send_alert(s,SSL3_AL_WARNING,al);
			return 1; 
					
		case SSL_TLSEXT_ERR_NOACK:
			s->servername_done=0;
			default:
		return 1;
1416
		}
1417
	}
1418

1419 1420 1421
int ssl_check_serverhello_tlsext(SSL *s)
	{
	int ret=SSL_TLSEXT_ERR_NOACK;
1422
	int al = SSL_AD_UNRECOGNIZED_NAME;
1423

1424 1425 1426 1427
#ifndef OPENSSL_NO_EC
	/* If we are client and using an elliptic curve cryptography cipher suite, then server
	 * must return a an EC point formats lists containing uncompressed.
	 */
1428 1429
	unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
	unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1430
	if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && 
1431
	    ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1432 1433
		{
		/* we are using an ECC cipher */
N
Nils Larsch 已提交
1434
		size_t i;
1435 1436
		unsigned char *list;
		int found_uncompressed = 0;
1437
		if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1438
			{
B
Bodo Möller 已提交
1439
			SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1440 1441
			return -1;
			}
1442
		list = s->session->tlsext_ecpointformatlist;
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
		for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
			{
			if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
				{
				found_uncompressed = 1;
				break;
				}
			}
		if (!found_uncompressed)
			{
B
Bodo Möller 已提交
1453
			SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1454 1455 1456 1457 1458 1459
			return -1;
			}
		}
	ret = SSL_TLSEXT_ERR_OK;
#endif /* OPENSSL_NO_EC */

1460
	if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 
1461
		ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1462
	else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 		
1463
		ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1464

1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487
#ifdef TLSEXT_TYPE_opaque_prf_input
	if (s->s3->server_opaque_prf_input_len > 0)
		{
		/* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
		 * So first verify that we really have a value from the server too. */

		if (s->s3->server_opaque_prf_input == NULL)
			{
			ret = SSL_TLSEXT_ERR_ALERT_FATAL;
			al = SSL_AD_HANDSHAKE_FAILURE;
			}
		
		/* Anytime the server *has* sent an opaque PRF input, we need to check
		 * that we have a client opaque PRF input of the same size. */
		if (s->s3->client_opaque_prf_input == NULL ||
		    s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
			{
			ret = SSL_TLSEXT_ERR_ALERT_FATAL;
			al = SSL_AD_ILLEGAL_PARAMETER;
			}
		}
#endif

1488 1489 1490 1491
	/* If we've requested certificate status and we wont get one
 	 * tell the callback
 	 */
	if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1492
			&& s->ctx && s->ctx->tlsext_status_cb)
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
		{
		int r;
		/* Set resp to NULL, resplen to -1 so callback knows
 		 * there is no response.
 		 */
		if (s->tlsext_ocsp_resp)
			{
			OPENSSL_free(s->tlsext_ocsp_resp);
			s->tlsext_ocsp_resp = NULL;
			}
		s->tlsext_ocsp_resplen = -1;
		r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
		if (r == 0)
			{
			al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
			ret = SSL_TLSEXT_ERR_ALERT_FATAL;
			}
		if (r < 0)
			{
			al = SSL_AD_INTERNAL_ERROR;
			ret = SSL_TLSEXT_ERR_ALERT_FATAL;
			}
		}

1517 1518
	switch (ret)
		{
1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
		case SSL_TLSEXT_ERR_ALERT_FATAL:
			ssl3_send_alert(s,SSL3_AL_FATAL,al); 
			return -1;

		case SSL_TLSEXT_ERR_ALERT_WARNING:
			ssl3_send_alert(s,SSL3_AL_WARNING,al);
			return 1; 
					
		case SSL_TLSEXT_ERR_NOACK:
			s->servername_done=0;
			default:
		return 1;
1531
		}
1532
	}
1533

1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544
/* Since the server cache lookup is done early on in the processing of client
 * hello and other operations depend on the result we need to handle any TLS
 * session ticket extension at the same time.
 */

int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
				const unsigned char *limit, SSL_SESSION **ret)
	{
	/* Point after session ID in client hello */
	const unsigned char *p = session_id + len;
	unsigned short i;
D
Dr. Stephen Henson 已提交
1545 1546 1547 1548 1549 1550 1551

	/* If tickets disabled behave as if no ticket present
 	 * to permit stateful resumption.
 	 */
	if (SSL_get_options(s) & SSL_OP_NO_TICKET)
		return 1;

1552 1553 1554 1555
	if ((s->version <= SSL3_VERSION) || !limit)
		return 1;
	if (p >= limit)
		return -1;
D
Dr. Stephen Henson 已提交
1556 1557 1558 1559 1560 1561 1562 1563
	/* Skip past DTLS cookie */
	if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
		{
		i = *(p++);
		p+= i;
		if (p >= limit)
			return -1;
		}
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
	/* Skip past cipher list */
	n2s(p, i);
	p+= i;
	if (p >= limit)
		return -1;
	/* Skip past compression algorithm list */
	i = *(p++);
	p += i;
	if (p > limit)
		return -1;
	/* Now at start of extensions */
	if ((p + 2) >= limit)
		return 1;
	n2s(p, i);
	while ((p + 4) <= limit)
		{
		unsigned short type, size;
		n2s(p, type);
		n2s(p, size);
		if (p + size > limit)
			return 1;
		if (type == TLSEXT_TYPE_session_ticket)
			{
			/* If tickets disabled indicate cache miss which will
 			 * trigger a full handshake
 			 */
			if (SSL_get_options(s) & SSL_OP_NO_TICKET)
D
Dr. Stephen Henson 已提交
1591 1592
				return 1;
			/* If zero length note client will accept a ticket
1593 1594 1595 1596 1597 1598 1599
 			 * and indicate cache miss to trigger full handshake
 			 */
			if (size == 0)
				{
				s->tlsext_ticket_expected = 1;
				return 0;	/* Cache miss */
				}
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			if (s->tls_session_secret_cb)
				{
				/* Indicate cache miss here and instead of
				 * generating the session from ticket now,
				 * trigger abbreviated handshake based on
				 * external mechanism to calculate the master
				 * secret later. */
				return 0;
				}
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
			return tls_decrypt_ticket(s, p, size, session_id, len,
									ret);
			}
		p += size;
		}
	return 1;
	}

static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
				const unsigned char *sess_id, int sesslen,
				SSL_SESSION **psess)
	{
	SSL_SESSION *sess;
	unsigned char *sdec;
	const unsigned char *p;
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1624
	int slen, mlen, renew_ticket = 0;
1625 1626 1627
	unsigned char tick_hmac[EVP_MAX_MD_SIZE];
	HMAC_CTX hctx;
	EVP_CIPHER_CTX ctx;
1628
	SSL_CTX *tctx = s->initial_ctx;
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1629 1630 1631 1632 1633 1634
	/* Need at least keyname + iv + some encrypted data */
	if (eticklen < 48)
		goto tickerr;
	/* Initialize session ticket encryption and HMAC contexts */
	HMAC_CTX_init(&hctx);
	EVP_CIPHER_CTX_init(&ctx);
1635
	if (tctx->tlsext_ticket_key_cb)
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		{
		unsigned char *nctick = (unsigned char *)etick;
1638
		int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
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Dr. Stephen Henson 已提交
1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649
							&ctx, &hctx, 0);
		if (rv < 0)
			return -1;
		if (rv == 0)
			goto tickerr;
		if (rv == 2)
			renew_ticket = 1;
		}
	else
		{
		/* Check key name matches */
1650
		if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
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1651
			goto tickerr;
1652
		HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
D
Dr. Stephen Henson 已提交
1653 1654
					tlsext_tick_md(), NULL);
		EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1655
				tctx->tlsext_tick_aes_key, etick + 16);
D
Dr. Stephen Henson 已提交
1656
		}
1657 1658 1659
	/* Attempt to process session ticket, first conduct sanity and
 	 * integrity checks on ticket.
 	 */
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1660
	mlen = HMAC_size(&hctx);
1661 1662 1663 1664 1665
	if (mlen < 0)
		{
		EVP_CIPHER_CTX_cleanup(&ctx);
		return -1;
		}
1666 1667 1668 1669 1670 1671 1672 1673 1674
	eticklen -= mlen;
	/* Check HMAC of encrypted ticket */
	HMAC_Update(&hctx, etick, eticklen);
	HMAC_Final(&hctx, tick_hmac, NULL);
	HMAC_CTX_cleanup(&hctx);
	if (memcmp(tick_hmac, etick + eticklen, mlen))
		goto tickerr;
	/* Attempt to decrypt session data */
	/* Move p after IV to start of encrypted ticket, update length */
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Dr. Stephen Henson 已提交
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	p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
	eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
	sdec = OPENSSL_malloc(eticklen);
	if (!sdec)
		{
		EVP_CIPHER_CTX_cleanup(&ctx);
		return -1;
		}
	EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
	if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
		goto tickerr;
	slen += mlen;
	EVP_CIPHER_CTX_cleanup(&ctx);
	p = sdec;
		
	sess = d2i_SSL_SESSION(NULL, &p, slen);
	OPENSSL_free(sdec);
	if (sess)
		{
		/* The session ID if non-empty is used by some clients to
 		 * detect that the ticket has been accepted. So we copy it to
 		 * the session structure. If it is empty set length to zero
 		 * as required by standard.
 		 */
		if (sesslen)
			memcpy(sess->session_id, sess_id, sesslen);
		sess->session_id_length = sesslen;
		*psess = sess;
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Dr. Stephen Henson 已提交
1703
		s->tlsext_ticket_expected = renew_ticket;
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
		return 1;
		}
	/* If session decrypt failure indicate a cache miss and set state to
 	 * send a new ticket
 	 */
	tickerr:	
	s->tlsext_ticket_expected = 1;
	return 0;
	}

#endif