t1_lib.c 45.4 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);
	s->version=TLS1_VERSION;
	}

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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 */
	if (s->client_version == SSL3_VERSION)
		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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#ifndef OPENSSL_NO_EC
	if (s->tlsext_ecpointformatlist != NULL)
		{
		/* 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)
		{
		/* 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;
		if (s->session && s->session->tlsext_tick)
			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
	if (s->s3->client_opaque_prf_input != NULL)
		{
		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)
		{
		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 */
	if (s->version == SSL3_VERSION)
		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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#ifndef OPENSSL_NO_EC
	if (s->tlsext_ecpointformatlist != NULL)
		{
		/* Add TLS extension ECPointFormats to the ServerHello 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_SERVERHELLO_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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		}
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	/* Currently the server should not respond with a SupportedCurves extension */
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#endif /* OPENSSL_NO_EC */
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	if (s->tlsext_ticket_expected
		&& !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 
		{ 
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		if ((long)(limit - ret - 4) < 0) return NULL; 
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		s2n(TLSEXT_TYPE_session_ticket,ret);
		s2n(0,ret);
		}
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	if (s->tlsext_status_expected)
		{ 
		if ((long)(limit - ret - 4) < 0) return NULL; 
		s2n(TLSEXT_TYPE_status_request,ret);
		s2n(0,ret);
		}

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#ifdef TLSEXT_TYPE_opaque_prf_input
	if (s->s3->server_opaque_prf_input != NULL)
		{
		size_t sol = s->s3->server_opaque_prf_input_len;
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		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
549 550 551 552 553 554 555 556 557 558 559 560 561 562
	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;

		}
563

564 565 566 567 568
	if ((extdatalen = ret-p-2)== 0) 
		return p;

	s2n(extdatalen,p);
	return ret;
569
	}
570

571 572
int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
	{
573 574 575
	unsigned short type;
	unsigned short size;
	unsigned short len;
576
	unsigned char *data = *p;
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	s->servername_done = 0;
578
	s->tlsext_status_type = -1;
579 580

	if (data >= (d+n-2))
581
		return 1;
582 583
	n2s(data,len);

584
	if (data > (d+n-len)) 
585
		return 1;
586

587 588
	while (data <= (d+n-4))
		{
589 590 591 592
		n2s(data,type);
		n2s(data,size);

		if (data+size > (d+n))
593
	   		return 1;
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#if 0
595
		fprintf(stderr,"Received extension type %d size %d\n",type,size);
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#endif
597 598 599
		if (s->tlsext_debug_cb)
			s->tlsext_debug_cb(s, 0, type, data, size,
						s->tlsext_debug_arg);
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/* 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. 

*/      

623 624
		if (type == TLSEXT_TYPE_server_name)
			{
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			unsigned char *sdata;
626
			int servname_type;
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			int dsize; 
		
			if (size < 2) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			n2s(data,dsize);  
635
			size -= 2;
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			if (dsize > size  ) 
637
				{
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				*al = SSL_AD_DECODE_ERROR;
				return 0;
				} 

			sdata = data;
			while (dsize > 3) 
				{
	 			servname_type = *(sdata++); 
646
				n2s(sdata,len);
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				dsize -= 3;

				if (len > dsize) 
650 651 652 653
					{
					*al = SSL_AD_DECODE_ERROR;
					return 0;
					}
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				if (s->servername_done == 0)
655 656 657
				switch (servname_type)
					{
				case TLSEXT_NAMETYPE_host_name:
658
					if (s->session->tlsext_hostname == NULL)
659
						{
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						if (len > TLSEXT_MAXLEN_host_name || 
661
							((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
662 663 664 665
							{
							*al = TLS1_AD_UNRECOGNIZED_NAME;
							return 0;
							}
666
						memcpy(s->session->tlsext_hostname, sdata, len);
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						s->session->tlsext_hostname[len]='\0';
						if (strlen(s->session->tlsext_hostname) != len) {
							OPENSSL_free(s->session->tlsext_hostname);
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							s->session->tlsext_hostname = NULL;
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							*al = TLS1_AD_UNRECOGNIZED_NAME;
							return 0;
673
						}
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						s->servername_done = 1; 

						}
					else 
						s->servername_done = strlen(s->session->tlsext_hostname) == len 
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							&& strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
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681
					break;
682

683 684
				default:
					break;
685
					}
686
				 
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				dsize -= len;
688
				}
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			if (dsize != 0) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}

695 696
			}

697 698 699 700 701 702 703 704 705 706 707 708
#ifndef OPENSSL_NO_EC
		else if (type == TLSEXT_TYPE_ec_point_formats)
			{
			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;
709
			if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
710 711 712 713 714 715 716 717 718 719 720 721 722
			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");
723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
#endif
			}
		else if (type == TLSEXT_TYPE_elliptic_curves)
			{
			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");
751 752
#endif
			}
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#endif /* OPENSSL_NO_EC */
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
#ifdef TLSEXT_TYPE_opaque_prf_input
		else if (type == TLSEXT_TYPE_opaque_prf_input)
			{
			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);
773 774 775 776
			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);
777 778 779 780 781 782 783
			if (s->s3->client_opaque_prf_input == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			}
#endif
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		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;
				}
			}
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
		else if (type == TLSEXT_TYPE_status_request
						&& s->ctx->tlsext_status_cb)
			{
		
			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;
			}
893

894 895
		/* session ticket processed earlier */
		data+=size;
896
		}
897
				
898 899
	*p = data;
	return 1;
900
	}
901 902 903

int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
	{
904 905 906 907 908 909 910 911
	unsigned short type;
	unsigned short size;
	unsigned short len;  
	unsigned char *data = *p;

	int tlsext_servername = 0;

	if (data >= (d+n-2))
912
		return 1;
913 914 915

	n2s(data,len);

916 917
	while(data <= (d+n-4))
		{
918 919 920 921
		n2s(data,type);
		n2s(data,size);

		if (data+size > (d+n))
922 923
	   		return 1;

924 925 926 927
		if (s->tlsext_debug_cb)
			s->tlsext_debug_cb(s, 1, type, data, size,
						s->tlsext_debug_arg);

928 929 930 931 932 933 934
		if (type == TLSEXT_TYPE_server_name)
			{
			if (s->tlsext_hostname == NULL || size > 0)
				{
				*al = TLS1_AD_UNRECOGNIZED_NAME;
				return 0;
				}
935
			tlsext_servername = 1;   
936
			}
937

938 939 940 941 942 943 944 945 946 947 948 949
#ifndef OPENSSL_NO_EC
		else if (type == TLSEXT_TYPE_ec_point_formats)
			{
			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;
950
			if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
			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
			}
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#endif /* OPENSSL_NO_EC */
967 968 969

		else if (type == TLSEXT_TYPE_session_ticket)
			{
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			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;
				}
976 977 978 979 980 981 982 983
			if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
				|| (size > 0))
				{
				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
				return 0;
				}
			s->tlsext_ticket_expected = 1;
			}
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
#ifdef TLSEXT_TYPE_opaque_prf_input
		else if (type == TLSEXT_TYPE_opaque_prf_input)
			{
			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);
1003 1004 1005 1006
			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);
1007 1008 1009 1010 1011 1012 1013 1014

			if (s->s3->server_opaque_prf_input == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			}
#endif
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
		else if (type == TLSEXT_TYPE_status_request)
			{
			/* 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;
			}
1028

1029
		data+=size;		
1030
		}
1031 1032

	if (data != d+n)
1033 1034 1035 1036
		{
		*al = SSL_AD_DECODE_ERROR;
		return 0;
		}
1037

1038 1039 1040 1041 1042 1043
	if (!s->hit && tlsext_servername == 1)
		{
 		if (s->tlsext_hostname)
			{
			if (s->session->tlsext_hostname == NULL)
				{
1044 1045
				s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);	
				if (!s->session->tlsext_hostname)
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
					{
					*al = SSL_AD_UNRECOGNIZED_NAME;
					return 0;
					}
				}
			else 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
1056
			}
1057
		}
1058

1059 1060
	*p = data;
	return 1;
1061
	}
1062

1063

1064 1065 1066
int ssl_prepare_clienthello_tlsext(SSL *s)
	{
#ifndef OPENSSL_NO_EC
1067 1068
	/* If we are client and using an elliptic curve cryptography cipher suite, send the point formats 
	 * and elliptic curves we support.
1069 1070 1071
	 */
	int using_ecc = 0;
	int i;
1072
	unsigned char *j;
1073
	unsigned long alg_k, alg_a;
1074
	STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1075

1076 1077
	for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
		{
1078 1079 1080 1081 1082
		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)))
1083 1084 1085 1086 1087 1088 1089 1090
			{
			using_ecc = 1;
			break;
			}
		}
	using_ecc = using_ecc && (s->version == TLS1_VERSION);
	if (using_ecc)
		{
1091 1092
		if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
		if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1093
			{
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			SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1095 1096
			return -1;
			}
1097 1098 1099 1100
		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;
1101

1102 1103
		/* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
		if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1104 1105
		s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
		if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1106
			{
1107
			s->tlsext_ellipticcurvelist_length = 0;
B
Bodo Möller 已提交
1108
			SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1109 1110
			return -1;
			}
1111 1112
		for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
				sizeof(nid_list)/sizeof(nid_list[0]); i++)
1113
			s2n(i,j);
1114 1115
		}
#endif /* OPENSSL_NO_EC */
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132

#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);

1133 1134 1135 1136
			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);
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
			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

1151
	return 1;
1152
	}
1153 1154 1155 1156

int ssl_prepare_serverhello_tlsext(SSL *s)
	{
#ifndef OPENSSL_NO_EC
1157
	/* If we are server and using an ECC cipher suite, send the point formats we support 
1158 1159
	 * if the client sent us an ECPointsFormat extension.  Note that the server is not
	 * supposed to send an EllipticCurves extension.
1160 1161
	 */

1162 1163 1164 1165 1166
	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);
	
1167 1168
	if (using_ecc)
		{
1169 1170
		if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
		if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1171
			{
B
Bodo Möller 已提交
1172
			SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1173 1174
			return -1;
			}
1175 1176 1177 1178
		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;
1179 1180
		}
#endif /* OPENSSL_NO_EC */
1181

1182
	return 1;
1183
	}
1184 1185

int ssl_check_clienthello_tlsext(SSL *s)
1186
	{
1187
	int ret=SSL_TLSEXT_ERR_NOACK;
1188 1189 1190
	int al = SSL_AD_UNRECOGNIZED_NAME;

#ifndef OPENSSL_NO_EC
1191 1192 1193 1194 1195
	/* 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.
1196 1197 1198 1199 1200 1201 1202 1203
	 */
#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);

1204 1205 1206 1207
	/* If status request then ask callback what to do.
 	 * Note: this must be called after servername callbacks in case 
 	 * the certificate has changed.
 	 */
1208
	if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
		{
		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;
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265

#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! */

1266 1267 1268 1269
				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);
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
				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;
			}
	}

1291
#endif
1292
 err:
1293 1294
	switch (ret)
		{
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
		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;
1307
		}
1308
	}
1309

1310 1311 1312
int ssl_check_serverhello_tlsext(SSL *s)
	{
	int ret=SSL_TLSEXT_ERR_NOACK;
1313
	int al = SSL_AD_UNRECOGNIZED_NAME;
1314

1315 1316 1317 1318
#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.
	 */
1319 1320
	unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
	unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1321
	if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) && 
1322
	    ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1323 1324
		{
		/* we are using an ECC cipher */
N
Nils Larsch 已提交
1325
		size_t i;
1326 1327
		unsigned char *list;
		int found_uncompressed = 0;
1328
		if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1329
			{
B
Bodo Möller 已提交
1330
			SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1331 1332
			return -1;
			}
1333
		list = s->session->tlsext_ecpointformatlist;
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
		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
1344
			SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1345 1346 1347 1348 1349 1350
			return -1;
			}
		}
	ret = SSL_TLSEXT_ERR_OK;
#endif /* OPENSSL_NO_EC */

1351
	if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0) 
1352
		ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1353
	else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0) 		
1354
		ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1355

1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378
#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

1379 1380 1381 1382
	/* If we've requested certificate status and we wont get one
 	 * tell the callback
 	 */
	if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1383
			&& s->ctx && s->ctx->tlsext_status_cb)
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
		{
		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;
			}
		}

1408 1409
	switch (ret)
		{
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
		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;
1422
		}
1423
	}
1424

1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435
/* 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
1436 1437 1438 1439 1440 1441 1442

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

1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
	if ((s->version <= SSL3_VERSION) || !limit)
		return 1;
	if (p >= limit)
		return -1;
	/* 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
1474 1475
				return 1;
			/* If zero length note client will accept a ticket
1476 1477 1478 1479 1480 1481 1482
 			 * and indicate cache miss to trigger full handshake
 			 */
			if (size == 0)
				{
				s->tlsext_ticket_expected = 1;
				return 0;	/* Cache miss */
				}
D
Dr. Stephen Henson 已提交
1483 1484 1485 1486 1487 1488 1489 1490 1491
			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;
				}
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
			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;
D
Dr. Stephen Henson 已提交
1507
	int slen, mlen, renew_ticket = 0;
1508 1509 1510
	unsigned char tick_hmac[EVP_MAX_MD_SIZE];
	HMAC_CTX hctx;
	EVP_CIPHER_CTX ctx;
D
Dr. Stephen Henson 已提交
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
	/* 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);
	if (s->ctx->tlsext_ticket_key_cb)
		{
		unsigned char *nctick = (unsigned char *)etick;
		int rv = s->ctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
							&ctx, &hctx, 0);
		if (rv < 0)
			return -1;
		if (rv == 0)
			goto tickerr;
		if (rv == 2)
			renew_ticket = 1;
		}
	else
		{
		/* Check key name matches */
		if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
			goto tickerr;
		HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
					tlsext_tick_md(), NULL);
		EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
				s->ctx->tlsext_tick_aes_key, etick + 16);
		}
1539 1540 1541
	/* Attempt to process session ticket, first conduct sanity and
 	 * integrity checks on ticket.
 	 */
D
Dr. Stephen Henson 已提交
1542
	mlen = HMAC_size(&hctx);
1543 1544 1545 1546 1547
	if (mlen < 0)
		{
		EVP_CIPHER_CTX_cleanup(&ctx);
		return -1;
		}
1548 1549 1550 1551 1552 1553 1554 1555 1556
	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 */
D
Dr. Stephen Henson 已提交
1557 1558
	p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
	eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
	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;
D
Dr. Stephen Henson 已提交
1585
		s->tlsext_ticket_expected = renew_ticket;
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596
		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