Commit message: Fix SRP ciphersuite DoS vulnerability.

If a client attempted to use an SRP ciphersuite and it had not been
set up correctly it would crash with a null pointer read. A malicious
server could exploit this in a DoS attack.

Thanks to Joonas Kuorilehto and Riku Hietamäki from Codenomicon
for reporting this issue.

CVE-2014-2970
Reviewed-by: Tim Hudson <tjh@openssl.org>
CVE: CVE-2014-2970
Vulnerability description: Rejected reason: DO NOT USE THIS CANDIDATE NUMBER.  ConsultIDs: CVE-2014-5139.  Reason: This candidate is a duplicate of CVE-2014-5139, and has also been used to refer to an unrelated topic that is currently outside the scope of CVE.  This unrelated topic is a LibreSSL code change adding functionality for certain process-bifurcation use cases that might arise in future LibreSSL-based applications.  There is no CVE ID associated with this LibreSSL code change.  As of 20140730, CVE-2014-5139 is an undisclosed vulnerability in a different product, with ongoing vulnerability coordination that had previously used the CVE-2014-2970 ID

Project: openssl

static int nid_cb(const char *elem, int len, void *arg)
	{
	nid_cb_st *narg = arg;
	size_t i;
	int nid;
	char etmp[20];
	if (narg->nidcnt == MAX_CURVELIST)
		return 0;
	if (len > (int)(sizeof(etmp) - 1))
		return 0;
	memcpy(etmp, elem, len);
	etmp[len] = 0;
	nid = EC_curve_nist2nid(etmp);
	if (nid == NID_undef)
		nid = OBJ_sn2nid(etmp);
	if (nid == NID_undef)
		nid = OBJ_ln2nid(etmp);
	if (nid == NID_undef)
		return 0;
	for (i = 0; i < narg->nidcnt; i++)
		if (narg->nid_arr[i] == nid)
			return 0;
	narg->nid_arr[narg->nidcnt++] = nid;
	return 1;
	}

Project: openssl

static int sig_cb(const char *elem, int len, void *arg)
	{
	sig_cb_st *sarg = arg;
	size_t i;
	char etmp[20], *p;
	int sig_alg, hash_alg;
	if (sarg->sigalgcnt == MAX_SIGALGLEN)
		return 0;
	if (len > (int)(sizeof(etmp) - 1))
		return 0;
	memcpy(etmp, elem, len);
	etmp[len] = 0;
	p = strchr(etmp, '+');
	if (!p)
		return 0;
	*p = 0;
	p++;
	if (!*p)
		return 0;

	if (!strcmp(etmp, "RSA"))
		sig_alg = EVP_PKEY_RSA;
	else if (!strcmp(etmp, "DSA"))
		sig_alg = EVP_PKEY_DSA;
	else if (!strcmp(etmp, "ECDSA"))
		sig_alg = EVP_PKEY_EC;
	else return 0;

	hash_alg = OBJ_sn2nid(p);
	if (hash_alg == NID_undef)
		hash_alg = OBJ_ln2nid(p);
	if (hash_alg == NID_undef)
		return 0;

	for (i = 0; i < sarg->sigalgcnt; i+=2)
		{
		if (sarg->sigalgs[i] == sig_alg
			&& sarg->sigalgs[i + 1] == hash_alg)
			return 0;
		}
	sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
	sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
	return 1;
	}

Project: openssl

unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf, unsigned char *limit, int *al)
	{
	int extdatalen=0;
	unsigned char *orig = buf;
	unsigned char *ret = buf;
	size_t i;
	custom_srv_ext_record *record;
#ifndef OPENSSL_NO_NEXTPROTONEG
	int next_proto_neg_seen;
#endif
#ifndef OPENSSL_NO_EC
	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_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
	using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
#endif
	/* don't add extensions for SSLv3, unless doing secure renegotiation */
	if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
		return orig;
	
	ret+=2;
	if (ret>=limit) return NULL; /* this really never occurs, but ... */

	if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
		{ 
		if ((long)(limit - ret - 4) < 0) return NULL; 

		s2n(TLSEXT_TYPE_server_name,ret);
		s2n(0,ret);
		}

	if(s->s3->send_connection_binding)
        {
          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 - ret - 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;
        }

#ifndef OPENSSL_NO_EC
	if (using_ecc)
		{
		const unsigned char *plist;
		size_t plistlen;
		/* Add TLS extension ECPointFormats to the ServerHello message */
		long lenmax; 

		tls1_get_formatlist(s, &plist, &plistlen);

		if ((lenmax = limit - ret - 5) < 0) return NULL; 
		if (plistlen > (size_t)lenmax) return NULL;
		if (plistlen > 255)
			{
			SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
			return NULL;
			}
		
		s2n(TLSEXT_TYPE_ec_point_formats,ret);
		s2n(plistlen + 1,ret);
		*(ret++) = (unsigned char) plistlen;
		memcpy(ret, plist, plistlen);
		ret+=plistlen;

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

	if (s->tlsext_ticket_expected && tls_use_ticket(s))
		{ 
		if ((long)(limit - ret - 4) < 0) return NULL; 
		s2n(TLSEXT_TYPE_session_ticket,ret);
		s2n(0,ret);
		}

	if (s->tlsext_status_expected)
		{ 
		if ((long)(limit - ret - 4) < 0) return NULL; 
		s2n(TLSEXT_TYPE_status_request,ret);
		s2n(0,ret);
		}

#ifdef TLSEXT_TYPE_opaque_prf_input
	if (s->s3->server_opaque_prf_input != NULL)
		{
		size_t sol = s->s3->server_opaque_prf_input_len;
		
		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

        if(s->srtp_profile)
                {
                int el;

                ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
                
                if((limit - ret - 4 - el) < 0) return NULL;

                s2n(TLSEXT_TYPE_use_srtp,ret);
                s2n(el,ret);

                if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
			{
			SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
			return NULL;
			}
                ret+=el;
                }

	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;

		}

#ifndef OPENSSL_NO_HEARTBEATS
	/* Add Heartbeat extension if we've received one */
	if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
		{
		if ((limit - ret - 4 - 1) < 0)
			return NULL;
		s2n(TLSEXT_TYPE_heartbeat,ret);
		s2n(1,ret);
		/* Set mode:
		 * 1: peer may send requests
		 * 2: peer not allowed to send requests
		 */
		if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
			*(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
		else
			*(ret++) = SSL_TLSEXT_HB_ENABLED;

		}
#endif

#ifndef OPENSSL_NO_NEXTPROTONEG
	next_proto_neg_seen = s->s3->next_proto_neg_seen;
	s->s3->next_proto_neg_seen = 0;
	if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
		{
		const unsigned char *npa;
		unsigned int npalen;
		int r;

		r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
		if (r == SSL_TLSEXT_ERR_OK)
			{
			if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
			s2n(TLSEXT_TYPE_next_proto_neg,ret);
			s2n(npalen,ret);
			memcpy(ret, npa, npalen);
			ret += npalen;
			s->s3->next_proto_neg_seen = 1;
			}
		}
#endif

	for (i = 0; i < s->ctx->custom_srv_ext_records_count; i++)
		{
		const unsigned char *out = NULL;
		unsigned short outlen = 0;
		int cb_retval = 0;

		record = &s->ctx->custom_srv_ext_records[i];

		/* NULL callback or -1 omits extension */
		if (!record->fn2)
			continue;
		cb_retval = record->fn2(s, record->ext_type,
								&out, &outlen, al,
								record->arg);
		if (cb_retval == 0)
			return NULL; /* error */
		if (cb_retval == -1)
			continue; /* skip this extension */
		if (limit < ret + 4 + outlen)
			return NULL;
		s2n(record->ext_type, ret);
		s2n(outlen, ret);
		memcpy(ret, out, outlen);
		ret += outlen;
		}
#ifdef TLSEXT_TYPE_encrypt_then_mac
	if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC)
		{
		/* Don't use encrypt_then_mac if AEAD: might want
		 * to disable for other ciphersuites too.
		 */
		if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD)
			s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
		else
			{
			s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
			s2n(0,ret);
			}
		}
#endif

	if (s->s3->alpn_selected)
		{
		const unsigned char *selected = s->s3->alpn_selected;
		unsigned len = s->s3->alpn_selected_len;

		if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
			return NULL;
		s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
		s2n(3 + len,ret);
		s2n(1 + len,ret);
		*ret++ = len;
		memcpy(ret, selected, len);
		ret += len;
		}

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

	s2n(extdatalen, orig);
	return ret;
	}

Project: openssl

int ssl_check_clienthello_tlsext_late(SSL *s)
	{
	int ret = SSL_TLSEXT_ERR_OK;
	int al;

	/* If status request then ask callback what to do.
 	 * Note: this must be called after servername callbacks in case
 	 * the certificate has changed, and must be called after the cipher
	 * has been chosen because this may influence which certificate is sent
 	 */
	if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
		{
		int r;
		CERT_PKEY *certpkey;
		certpkey = ssl_get_server_send_pkey(s);
		/* If no certificate can't return certificate status */
		if (certpkey == NULL)
			{
			s->tlsext_status_expected = 0;
			return 1;
			}
		/* Set current certificate to one we will use so
		 * SSL_get_certificate et al can pick it up.
		 */
		s->cert->key = certpkey;
		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;

 err:
	switch (ret)
		{
		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; 

		default:
			return 1;
		}
	}

Project: openssl

DH *ssl_get_auto_dh(SSL *s)
	{
	int dh_secbits = 80;
	if (s->cert->dh_tmp_auto == 2)
		return DH_get_1024_160();
	if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
		{
		if (s->s3->tmp.new_cipher->strength_bits == 256)
			dh_secbits = 128;
		else
			dh_secbits = 80;
		}
	else
		{
		CERT_PKEY *cpk = ssl_get_server_send_pkey(s);
		dh_secbits = EVP_PKEY_security_bits(cpk->privatekey);
		}

	if (dh_secbits >= 128)
		{
		DH *dhp = DH_new();
		if (!dhp)
			return NULL;
		dhp->g = BN_new();
		if (dhp->g)
			BN_set_word(dhp->g, 2);
		if (dh_secbits >= 192)
			dhp->p = get_rfc3526_prime_8192(NULL);
		else
			dhp->p = get_rfc3526_prime_3072(NULL);
		if (!dhp->p || !dhp->g)
			{
			DH_free(dhp);
			return NULL;
			}
		return dhp;
		}
	if (dh_secbits >= 112)
		return DH_get_2048_224();
	return DH_get_1024_160();
	}

Project: openssl

int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n) 
	{
	int al = -1;
	if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0) 
		{
		ssl3_send_alert(s,SSL3_AL_FATAL,al); 
		return 0;
		}

	if (ssl_check_clienthello_tlsext_early(s) <= 0) 
		{
		SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
		return 0;
		}
	return 1;
}

Project: openssl

int ssl_prepare_clienthello_tlsext(SSL *s)
	{

#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);

			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);
			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

	return 1;
	}

Project: openssl

static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al) 
	{	
	unsigned short type;
	unsigned short size;
	unsigned short len;
	unsigned char *data = *p;
	int renegotiate_seen = 0;
	size_t i;

	s->servername_done = 0;
	s->tlsext_status_type = -1;
#ifndef OPENSSL_NO_NEXTPROTONEG
	s->s3->next_proto_neg_seen = 0;
#endif

	if (s->s3->alpn_selected)
		{
		OPENSSL_free(s->s3->alpn_selected);
		s->s3->alpn_selected = NULL;
		}

	/* Clear observed custom extensions */
	s->s3->serverinfo_client_tlsext_custom_types_count = 0;
	if (s->s3->serverinfo_client_tlsext_custom_types != NULL)
		{
		OPENSSL_free(s->s3->serverinfo_client_tlsext_custom_types);
		s->s3->serverinfo_client_tlsext_custom_types = NULL;
		}

#ifndef OPENSSL_NO_HEARTBEATS
	s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
	                       SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
#endif

#ifndef OPENSSL_NO_EC
	if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
		ssl_check_for_safari(s, data, d, n);
#endif /* !OPENSSL_NO_EC */

	/* Clear any signature algorithms extension received */
	if (s->cert->peer_sigalgs)
		{
		OPENSSL_free(s->cert->peer_sigalgs);
		s->cert->peer_sigalgs = NULL;
		}
	/* Clear any shared sigtnature algorithms */
	if (s->cert->shared_sigalgs)
		{
		OPENSSL_free(s->cert->shared_sigalgs);
		s->cert->shared_sigalgs = NULL;
		}
	/* Clear certificate digests and validity flags */
	for (i = 0; i < SSL_PKEY_NUM; i++)
		{
		s->cert->pkeys[i].digest = NULL;
		s->cert->pkeys[i].valid_flags = 0;
		}

#ifdef TLSEXT_TYPE_encrypt_then_mac
	s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
#endif

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

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

	while (data <= (d+n-4))
		{
		n2s(data,type);
		n2s(data,size);

		if (data+size > (d+n))
	   		goto ri_check;
#if 0
		fprintf(stderr,"Received extension type %d size %d\n",type,size);
#endif
		if (s->tlsext_debug_cb)
			s->tlsext_debug_cb(s, 0, type, data, size,
						s->tlsext_debug_arg);
/* 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. 

*/      

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

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

				if (len > dsize) 
					{
					*al = SSL_AD_DECODE_ERROR;
					return 0;
					}
				if (s->servername_done == 0)
				switch (servname_type)
					{
				case TLSEXT_NAMETYPE_host_name:
					if (!s->hit)
						{
						if(s->session->tlsext_hostname)
							{
							*al = SSL_AD_DECODE_ERROR;
							return 0;
							}
						if (len > TLSEXT_MAXLEN_host_name)
							{
							*al = TLS1_AD_UNRECOGNIZED_NAME;
							return 0;
							}
						if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
							{
							*al = TLS1_AD_INTERNAL_ERROR;
							return 0;
							}
						memcpy(s->session->tlsext_hostname, sdata, len);
						s->session->tlsext_hostname[len]='\0';
						if (strlen(s->session->tlsext_hostname) != len) {
							OPENSSL_free(s->session->tlsext_hostname);
							s->session->tlsext_hostname = NULL;
							*al = TLS1_AD_UNRECOGNIZED_NAME;
							return 0;
						}
						s->servername_done = 1; 

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

				default:
					break;
					}
				 
				dsize -= len;
				}
			if (dsize != 0) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}

			}
#ifndef OPENSSL_NO_SRP
		else if (type == TLSEXT_TYPE_srp)
			{
			if (size <= 0 || ((len = data[0])) != (size -1))
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			if (s->srp_ctx.login != NULL)
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
				return -1;
			memcpy(s->srp_ctx.login, &data[1], len);
			s->srp_ctx.login[len]='\0';
  
			if (strlen(s->srp_ctx.login) != len) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			}
#endif

#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 || 
				ecpointformatlist_length < 1)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			if (!s->hit)
				{
				if(s->session->tlsext_ecpointformatlist)
					{
					OPENSSL_free(s->session->tlsext_ecpointformatlist);
					s->session->tlsext_ecpointformatlist = NULL;
					}
				s->session->tlsext_ecpointformatlist_length = 0;
				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");
#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 ||
				ellipticcurvelist_length < 1)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			if (!s->hit)
				{
				if(s->session->tlsext_ellipticcurvelist)
					{
					*al = TLS1_AD_DECODE_ERROR;
					return 0;
					}
				s->session->tlsext_ellipticcurvelist_length = 0;
				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");
#endif
			}
#endif /* OPENSSL_NO_EC */
#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);
			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);
			if (s->s3->client_opaque_prf_input == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			}
#endif
		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;
				}
			}
		else if (type == TLSEXT_TYPE_renegotiate)
			{
			if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
				return 0;
			renegotiate_seen = 1;
			}
		else if (type == TLSEXT_TYPE_signature_algorithms)
			{
			int dsize;
			if (s->cert->peer_sigalgs || size < 2) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			n2s(data,dsize);
			size -= 2;
			if (dsize != size || dsize & 1 || !dsize) 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			if (!tls1_process_sigalgs(s, data, dsize))
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			/* If sigalgs received and no shared algorithms fatal
			 * error.
			 */
			if (s->cert->peer_sigalgs && !s->cert->shared_sigalgs)
				{
				SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
					SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
				*al = SSL_AD_ILLEGAL_PARAMETER;
				return 0;
				}
			}
		else if (type == TLSEXT_TYPE_status_request)
			{
		
			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;
					size -= 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 */
				if (size < 2)
					{
					*al = SSL_AD_DECODE_ERROR;
					return 0;
					}
				n2s(data,dsize);
				size -= 2;
				if (dsize != size)
					{
					*al = SSL_AD_DECODE_ERROR;
					return 0;
					}
				sdata = data;
				if (dsize > 0)
					{
					if (s->tlsext_ocsp_exts)
						{
						sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
									   X509_EXTENSION_free);
						}

					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;
			}
#ifndef OPENSSL_NO_HEARTBEATS
		else if (type == TLSEXT_TYPE_heartbeat)
			{
			switch(data[0])
				{
				case 0x01:	/* Client allows us to send HB requests */
							s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
							break;
				case 0x02:	/* Client doesn't accept HB requests */
							s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
							s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
							break;
				default:	*al = SSL_AD_ILLEGAL_PARAMETER;
							return 0;
				}
			}
#endif
#ifndef OPENSSL_NO_NEXTPROTONEG
		else if (type == TLSEXT_TYPE_next_proto_neg &&
			 s->s3->tmp.finish_md_len == 0 &&
			 s->s3->alpn_selected == NULL)
			{
			/* We shouldn't accept this extension on a
			 * renegotiation.
			 *
			 * s->new_session will be set on renegotiation, but we
			 * probably shouldn't rely that it couldn't be set on
			 * the initial renegotation too in certain cases (when
			 * there's some other reason to disallow resuming an
			 * earlier session -- the current code won't be doing
			 * anything like that, but this might change).

			 * A valid sign that there's been a previous handshake
			 * in this connection is if s->s3->tmp.finish_md_len >
			 * 0.  (We are talking about a check that will happen
			 * in the Hello protocol round, well before a new
			 * Finished message could have been computed.) */
			s->s3->next_proto_neg_seen = 1;
			}
#endif

		else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
			 s->ctx->alpn_select_cb &&
			 s->s3->tmp.finish_md_len == 0)
			{
			if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
				return 0;
#ifndef OPENSSL_NO_NEXTPROTONEG
			/* ALPN takes precedence over NPN. */
			s->s3->next_proto_neg_seen = 0;
#endif
			}

		/* session ticket processed earlier */
		else if (type == TLSEXT_TYPE_use_srtp)
                        {
			if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
							      al))
				return 0;
                        }
		/* If this ClientHello extension was unhandled and this is 
		 * a nonresumed connection, check whether the extension is a 
		 * custom TLS Extension (has a custom_srv_ext_record), and if
		 * so call the callback and record the extension number so that
		 * an appropriate ServerHello may be later returned.
		 */
		else if (!s->hit && s->ctx->custom_srv_ext_records_count)
			{
			custom_srv_ext_record *record;

			for (i=0; i < s->ctx->custom_srv_ext_records_count; i++)
				{
				record = &s->ctx->custom_srv_ext_records[i];
				if (type == record->ext_type)
					{
					if (record->fn1 && !record->fn1(s, type, data, size, al, record->arg))
						return 0;
					}						
				}
			}
#ifdef TLSEXT_TYPE_encrypt_then_mac
		else if (type == TLSEXT_TYPE_encrypt_then_mac)
			s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
#endif

		data+=size;
		}

	*p = data;

	ri_check:

	/* Need RI if renegotiating */

	if (!renegotiate_seen && s->renegotiate &&
		!(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
		{
		*al = SSL_AD_HANDSHAKE_FAILURE;
	 	SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
				SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
		return 0;
		}
	/* If no signature algorithms extension set default values */
	if (!s->cert->peer_sigalgs)
		ssl_cert_set_default_md(s->cert);

	return 1;
	}

Project: openssl

static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
	{
	unsigned short length;
	unsigned short type;
	unsigned short size;
	unsigned char *data = *p;
	int tlsext_servername = 0;
	int renegotiate_seen = 0;

#ifndef OPENSSL_NO_NEXTPROTONEG
	s->s3->next_proto_neg_seen = 0;
#endif

	if (s->s3->alpn_selected)
		{
		OPENSSL_free(s->s3->alpn_selected);
		s->s3->alpn_selected = NULL;
		}

#ifndef OPENSSL_NO_HEARTBEATS
	s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
	                       SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
#endif

#ifdef TLSEXT_TYPE_encrypt_then_mac
	s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
#endif

	if (data >= (d+n-2))
		goto ri_check;

	n2s(data,length);
	if (data+length != d+n)
		{
		*al = SSL_AD_DECODE_ERROR;
		return 0;
		}

	while(data <= (d+n-4))
		{
		n2s(data,type);
		n2s(data,size);

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

		if (s->tlsext_debug_cb)
			s->tlsext_debug_cb(s, 1, type, data, size,
						s->tlsext_debug_arg);

		if (type == TLSEXT_TYPE_server_name)
			{
			if (s->tlsext_hostname == NULL || size > 0)
				{
				*al = TLS1_AD_UNRECOGNIZED_NAME;
				return 0;
				}
			tlsext_servername = 1;   
			}

#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;
				}
			if (!s->hit)
				{
				s->session->tlsext_ecpointformatlist_length = 0;
				if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
				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
			}
#endif /* OPENSSL_NO_EC */

		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;
				}
			if (!tls_use_ticket(s) || (size > 0))
				{
				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
				return 0;
				}
			s->tlsext_ticket_expected = 1;
			}
#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);
			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);

			if (s->s3->server_opaque_prf_input == NULL)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			}
#endif
		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;
			}
#ifndef OPENSSL_NO_NEXTPROTONEG
		else if (type == TLSEXT_TYPE_next_proto_neg &&
			 s->s3->tmp.finish_md_len == 0)
			{
			unsigned char *selected;
			unsigned char selected_len;

			/* We must have requested it. */
			if (s->ctx->next_proto_select_cb == NULL)
				{
				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
				return 0;
				}
			/* The data must be valid */
			if (!ssl_next_proto_validate(data, size))
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			s->next_proto_negotiated = OPENSSL_malloc(selected_len);
			if (!s->next_proto_negotiated)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			memcpy(s->next_proto_negotiated, selected, selected_len);
			s->next_proto_negotiated_len = selected_len;
			s->s3->next_proto_neg_seen = 1;
			}
#endif

		else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation)
			{
			unsigned len;

			/* We must have requested it. */
			if (s->alpn_client_proto_list == NULL)
				{
				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
				return 0;
				}
			if (size < 4)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			/* The extension data consists of:
			 *   uint16 list_length
			 *   uint8 proto_length;
			 *   uint8 proto[proto_length]; */
			len = data[0];
			len <<= 8;
			len |= data[1];
			if (len != (unsigned) size - 2)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			len = data[2];
			if (len != (unsigned) size - 3)
				{
				*al = TLS1_AD_DECODE_ERROR;
				return 0;
				}
			if (s->s3->alpn_selected)
				OPENSSL_free(s->s3->alpn_selected);
			s->s3->alpn_selected = OPENSSL_malloc(len);
			if (!s->s3->alpn_selected)
				{
				*al = TLS1_AD_INTERNAL_ERROR;
				return 0;
				}
			memcpy(s->s3->alpn_selected, data + 3, len);
			s->s3->alpn_selected_len = len;
			}

		else if (type == TLSEXT_TYPE_renegotiate)
			{
			if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
				return 0;
			renegotiate_seen = 1;
			}
#ifndef OPENSSL_NO_HEARTBEATS
		else if (type == TLSEXT_TYPE_heartbeat)
			{
			switch(data[0])
				{
				case 0x01:	/* Server allows us to send HB requests */
							s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
							break;
				case 0x02:	/* Server doesn't accept HB requests */
							s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
							s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
							break;
				default:	*al = SSL_AD_ILLEGAL_PARAMETER;
							return 0;
				}
			}
#endif
		else if (type == TLSEXT_TYPE_use_srtp)
                        {
                        if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
							      al))
                                return 0;
                        }
		/* If this extension type was not otherwise handled, but 
		 * matches a custom_cli_ext_record, then send it to the c
		 * callback */
		else if (s->ctx->custom_cli_ext_records_count)
			{
			size_t i;
			custom_cli_ext_record* record;

			for (i = 0; i < s->ctx->custom_cli_ext_records_count; i++)
				{
				record = &s->ctx->custom_cli_ext_records[i];
				if (record->ext_type == type)
					{
					if (record->fn2 && !record->fn2(s, type, data, size, al, record->arg))
						return 0;
					break;
					}
				}			
			}
#ifdef TLSEXT_TYPE_encrypt_then_mac
		else if (type == TLSEXT_TYPE_encrypt_then_mac)
			{
			/* Ignore if inappropriate ciphersuite */
			if (s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD)
				s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
			}
#endif
 
		data += size;
		}

	if (data != d+n)
		{
		*al = SSL_AD_DECODE_ERROR;
		return 0;
		}

	if (!s->hit && tlsext_servername == 1)
		{
 		if (s->tlsext_hostname)
			{
			if (s->session->tlsext_hostname == NULL)
				{
				s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);	
				if (!s->session->tlsext_hostname)
					{
					*al = SSL_AD_UNRECOGNIZED_NAME;
					return 0;
					}
				}
			else 
				{
				*al = SSL_AD_DECODE_ERROR;
				return 0;
				}
			}
		}

	*p = data;

	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.
	 */
	if (!renegotiate_seen
		&& !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
		&& !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
		{
		*al = SSL_AD_HANDSHAKE_FAILURE;
		SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
				SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
		return 0;
		}

	return 1;
	}

Project: openssl

static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
	{
	int secbits;
	EVP_PKEY *pkey = X509_get_pubkey(x);
	if (pkey)
		{
		secbits = EVP_PKEY_security_bits(pkey);
		EVP_PKEY_free(pkey);
		}
	else
		secbits = -1;
	if (s)
		return ssl_security(s, op, secbits, 0, x);
	else
		return ssl_ctx_security(ctx, op, secbits, 0, x);
	}

Project: openssl

static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
	{
	/* Lookup signature algorithm digest */
	int secbits = -1, md_nid = NID_undef, sig_nid;
	sig_nid = X509_get_signature_nid(x);
	if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL))
		{
		const EVP_MD *md;
		if (md_nid && (md = EVP_get_digestbynid(md_nid)))
				secbits = EVP_MD_size(md) * 4;
		}
	if (s)
		return ssl_security(s, op, secbits, md_nid, x);
	else
		return ssl_ctx_security(ctx, op, secbits, md_nid, x);
	}

Project: openssl

void ssl_set_sig_mask(unsigned long *pmask_a, SSL *s, int op)
	{
	const unsigned char *sigalgs;
	size_t i, sigalgslen;
	int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
	/* Now go through all signature algorithms seeing if we support
	 * any for RSA, DSA, ECDSA. Do this for all versions not just
	 * TLS 1.2. To keep down calls to security callback only check
	 * if we have to.
	 */
	sigalgslen = tls12_get_psigalgs(s, &sigalgs);
	for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
		{
		switch(sigalgs[1])
			{
#ifndef OPENSSL_NO_RSA
		case TLSEXT_signature_rsa:
			if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs))
				have_rsa = 1;
			break;
#endif
#ifndef OPENSSL_NO_DSA
		case TLSEXT_signature_dsa:
			if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs))
				have_dsa = 1;
			break;
#endif
#ifndef OPENSSL_NO_ECDSA
		case TLSEXT_signature_ecdsa:
			if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs))
				have_ecdsa = 1;
			break;
#endif
			}
		}
	if (!have_rsa)
		*pmask_a |= SSL_aRSA;
	if (!have_dsa)
		*pmask_a |= SSL_aDSS;
	if (!have_ecdsa)
		*pmask_a |= SSL_aECDSA;
	}

Project: openssl

int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
				const unsigned char *sig, EVP_PKEY *pkey)
	{
	const unsigned char *sent_sigs;
	size_t sent_sigslen, i;
	int sigalg = tls12_get_sigid(pkey);
	/* Should never happen */
	if (sigalg == -1)
		return -1;
	/* Check key type is consistent with signature */
	if (sigalg != (int)sig[1])
		{
		SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
		return 0;
		}
#ifndef OPENSSL_NO_EC
	if (pkey->type == EVP_PKEY_EC)
		{
		unsigned char curve_id[2], comp_id;
		/* Check compression and curve matches extensions */
		if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec))
			return 0;
		if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id))
			{
			SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_CURVE);
			return 0;
			}
		/* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
		if (tls1_suiteb(s))
			{
			if (curve_id[0])
				return 0;
			if (curve_id[1] == TLSEXT_curve_P_256)
				{
				if (sig[0] != TLSEXT_hash_sha256)
					{
					SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
						SSL_R_ILLEGAL_SUITEB_DIGEST);
					return 0;
					}
				}
			else if (curve_id[1] == TLSEXT_curve_P_384)
				{
				if (sig[0] != TLSEXT_hash_sha384)
					{
					SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
						SSL_R_ILLEGAL_SUITEB_DIGEST);
					return 0;
					}
				}
			else
				return 0;
			}
		}
	else if (tls1_suiteb(s))
		return 0;
#endif

	/* Check signature matches a type we sent */
	sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
	for (i = 0; i < sent_sigslen; i+=2, sent_sigs+=2)
		{
		if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
			break;
		}
	/* Allow fallback to SHA1 if not strict mode */
	if (i == sent_sigslen && (sig[0] != TLSEXT_hash_sha1 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
		{
		SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
		return 0;
		}
	*pmd = tls12_get_hash(sig[0]);
	if (*pmd == NULL)
		{
		SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_UNKNOWN_DIGEST);
		return 0;
		}
	/* Make sure security callback allows algorithm */
	if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
				EVP_MD_size(*pmd) * 4, EVP_MD_type(*pmd),
								(void *)sig))
		{
		SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
		return 0;
		}
	/* Store the digest used so applications can retrieve it if they
	 * wish.
	 */
	if (s->session && s->session->sess_cert)
		s->session->sess_cert->peer_key->digest = *pmd;
	return 1;
	}

Project: openssl

const EVP_MD *tls12_get_hash(unsigned char hash_alg)
	{
	const tls12_hash_info *inf;
#ifndef OPENSSL_FIPS
	if (hash_alg == TLSEXT_hash_md5 && FIPS_mode())
		return NULL;
#endif
	inf = tls12_get_hash_info(hash_alg);
	if (!inf || !inf->mfunc)
		return NULL; 
	return inf->mfunc();
	}

Project: openssl

static int tls12_sigalg_allowed(SSL *s, int op, const unsigned char *ptmp)
	{
	/* See if we have an entry in the hash table and it is enabled */
	const tls12_hash_info *hinf = tls12_get_hash_info(ptmp[0]);
	if (!hinf || !hinf->mfunc)
		return 0;
	/* See if public key algorithm allowed */
	if (tls12_get_pkey_idx(ptmp[1]) == -1)
		return 0;
	/* Finally see if security callback allows it */
	return ssl_security(s, op, hinf->secbits, hinf->nid, (void *)ptmp);
	}

Project: openssl

static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
					 unsigned data_len, int *al)
	{
	unsigned i;
	unsigned proto_len;
	const unsigned char *selected;
	unsigned char selected_len;
	int r;

	if (s->ctx->alpn_select_cb == NULL)
		return 0;

	if (data_len < 2)
		goto parse_error;

	/* data should contain a uint16 length followed by a series of 8-bit,
	 * length-prefixed strings. */
	i = ((unsigned) data[0]) << 8 |
	    ((unsigned) data[1]);
	data_len -= 2;
	data += 2;
	if (data_len != i)
		goto parse_error;

	if (data_len < 2)
		goto parse_error;

	for (i = 0; i < data_len;)
		{
		proto_len = data[i];
		i++;

		if (proto_len == 0)
			goto parse_error;

		if (i + proto_len < i || i + proto_len > data_len)
			goto parse_error;

		i += proto_len;
		}

	r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
				   s->ctx->alpn_select_cb_arg);
	if (r == SSL_TLSEXT_ERR_OK) {
		if (s->s3->alpn_selected)
			OPENSSL_free(s->s3->alpn_selected);
		s->s3->alpn_selected = OPENSSL_malloc(selected_len);
		if (!s->s3->alpn_selected)
			{
			*al = SSL_AD_INTERNAL_ERROR;
			return -1;
			}
		memcpy(s->s3->alpn_selected, selected, selected_len);
		s->s3->alpn_selected_len = selected_len;
	}
	return 0;

parse_error:
	*al = SSL_AD_DECODE_ERROR;
	return -1;
	}

Project: openssl

static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
	{
	return 1;
	}

Project: openssl

int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
									int idx)
	{
	int i;
	int rv = 0;
	int check_flags = 0, strict_mode;
	CERT_PKEY *cpk = NULL;
	CERT *c = s->cert;
	unsigned int suiteb_flags = tls1_suiteb(s);
	/* idx == -1 means checking server chains */
	if (idx != -1)
		{
		/* idx == -2 means checking client certificate chains */
		if (idx == -2)
			{
			cpk = c->key;
			idx = cpk - c->pkeys;
			}
		else
			cpk = c->pkeys + idx;
		x = cpk->x509;
		pk = cpk->privatekey;
		chain = cpk->chain;
		strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
		/* If no cert or key, forget it */
		if (!x || !pk)
			goto end;
#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
		/* Allow any certificate to pass test */
		if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
			{
			rv = CERT_PKEY_STRICT_FLAGS|CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_VALID|CERT_PKEY_SIGN;
			cpk->valid_flags = rv;
			return rv;
			}
#endif
		}
	else
		{
		if (!x || !pk)
			goto end;
		idx = ssl_cert_type(x, pk);
		if (idx == -1)
			goto end;
		cpk = c->pkeys + idx;
		if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
			check_flags = CERT_PKEY_STRICT_FLAGS;
		else
			check_flags = CERT_PKEY_VALID_FLAGS;
		strict_mode = 1;
		}

	if (suiteb_flags)
		{
		int ok;
		if (check_flags)
			check_flags |= CERT_PKEY_SUITEB;
		ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
		if (ok != X509_V_OK)
			{
			if (check_flags)
				rv |= CERT_PKEY_SUITEB;
			else
				goto end;
			}
		}

	/* Check all signature algorithms are consistent with
	 * signature algorithms extension if TLS 1.2 or later
	 * and strict mode.
	 */
	if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode)
		{
		int default_nid;
		unsigned char rsign = 0;
		if (c->peer_sigalgs)
			default_nid = 0;
		/* If no sigalgs extension use defaults from RFC5246 */
		else
			{
			switch(idx)
				{	
			case SSL_PKEY_RSA_ENC:
			case SSL_PKEY_RSA_SIGN:
			case SSL_PKEY_DH_RSA:
				rsign = TLSEXT_signature_rsa;
				default_nid = NID_sha1WithRSAEncryption;
				break;

			case SSL_PKEY_DSA_SIGN:
			case SSL_PKEY_DH_DSA:
				rsign = TLSEXT_signature_dsa;
				default_nid = NID_dsaWithSHA1;
				break;

			case SSL_PKEY_ECC:
				rsign = TLSEXT_signature_ecdsa;
				default_nid = NID_ecdsa_with_SHA1;
				break;

			default:
				default_nid = -1;
				break;
				}
			}
		/* If peer sent no signature algorithms extension and we
		 * have set preferred signature algorithms check we support
		 * sha1.
		 */
		if (default_nid > 0 && c->conf_sigalgs)
			{
			size_t j;
			const unsigned char *p = c->conf_sigalgs;
			for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
				{
				if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
					break;
				}
			if (j == c->conf_sigalgslen)
				{
				if (check_flags)
					goto skip_sigs;
				else
					goto end;
				}
			}
		/* Check signature algorithm of each cert in chain */
		if (!tls1_check_sig_alg(c, x, default_nid))
			{
			if (!check_flags) goto end;
			}
		else
			rv |= CERT_PKEY_EE_SIGNATURE;
		rv |= CERT_PKEY_CA_SIGNATURE;
		for (i = 0; i < sk_X509_num(chain); i++)
			{
			if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
							default_nid))
				{
				if (check_flags)
					{
					rv &= ~CERT_PKEY_CA_SIGNATURE;
					break;
					}
				else
					goto end;
				}
			}
		}
	/* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
	else if(check_flags)
		rv |= CERT_PKEY_EE_SIGNATURE|CERT_PKEY_CA_SIGNATURE;
	skip_sigs:
	/* Check cert parameters are consistent */
	if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
		rv |= CERT_PKEY_EE_PARAM;
	else if (!check_flags)
		goto end;
	if (!s->server)
		rv |= CERT_PKEY_CA_PARAM;
	/* In strict mode check rest of chain too */
	else if (strict_mode)
		{
		rv |= CERT_PKEY_CA_PARAM;
		for (i = 0; i < sk_X509_num(chain); i++)
			{
			X509 *ca = sk_X509_value(chain, i);
			if (!tls1_check_cert_param(s, ca, 0))
				{
				if (check_flags)
					{
					rv &= ~CERT_PKEY_CA_PARAM;
					break;
					}
				else
					goto end;
				}
			}
		}
	if (!s->server && strict_mode)
		{
		STACK_OF(X509_NAME) *ca_dn;
		int check_type = 0;
		switch (pk->type)
			{
		case EVP_PKEY_RSA:
			check_type = TLS_CT_RSA_SIGN;
			break;
		case EVP_PKEY_DSA:
			check_type = TLS_CT_DSS_SIGN;
			break;
		case EVP_PKEY_EC:
			check_type = TLS_CT_ECDSA_SIGN;
			break;
		case EVP_PKEY_DH:
		case EVP_PKEY_DHX:
				{
				int cert_type = X509_certificate_type(x, pk);
				if (cert_type & EVP_PKS_RSA)
					check_type = TLS_CT_RSA_FIXED_DH;
				if (cert_type & EVP_PKS_DSA)
					check_type = TLS_CT_DSS_FIXED_DH;
				}
			}
		if (check_type)
			{
			const unsigned char *ctypes;
			int ctypelen;
			if (c->ctypes)
				{
				ctypes = c->ctypes;
				ctypelen = (int)c->ctype_num;
				}
			else
				{
				ctypes = (unsigned char *)s->s3->tmp.ctype;
				ctypelen = s->s3->tmp.ctype_num;
				}
			for (i = 0; i < ctypelen; i++)
				{
				if (ctypes[i] == check_type)
					{
					rv |= CERT_PKEY_CERT_TYPE;
					break;
					}
				}
			if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
				goto end;
			}
		else
			rv |= CERT_PKEY_CERT_TYPE;


		ca_dn = s->s3->tmp.ca_names;

		if (!sk_X509_NAME_num(ca_dn))
			rv |= CERT_PKEY_ISSUER_NAME;

		if (!(rv & CERT_PKEY_ISSUER_NAME))
			{
			if (ssl_check_ca_name(ca_dn, x))
				rv |= CERT_PKEY_ISSUER_NAME;
			}
		if (!(rv & CERT_PKEY_ISSUER_NAME))
			{
			for (i = 0; i < sk_X509_num(chain); i++)
				{
				X509 *xtmp = sk_X509_value(chain, i);
				if (ssl_check_ca_name(ca_dn, xtmp))
					{
					rv |= CERT_PKEY_ISSUER_NAME;
					break;
					}
				}
			}
		if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
			goto end;
		}
	else
		rv |= CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE;

	if (!check_flags || (rv & check_flags) == check_flags)
		rv |= CERT_PKEY_VALID;

	end:

	if (TLS1_get_version(s) >= TLS1_2_VERSION)
		{
		if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
			rv |= CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_SIGN;
		else if (cpk->digest)
			rv |= CERT_PKEY_SIGN;
		}
	else
		rv |= CERT_PKEY_SIGN|CERT_PKEY_EXPLICIT_SIGN;

	/* When checking a CERT_PKEY structure all flags are irrelevant
	 * if the chain is invalid.
	 */
	if (!check_flags)
		{
		if (rv & CERT_PKEY_VALID)
			cpk->valid_flags = rv;
		else
			{
			/* Preserve explicit sign flag, clear rest */
			cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
			return 0;
			}
		}
	return rv;
	}

Project: openssl

int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
	{
	const unsigned char *curves;
	size_t curveslen, i;
	unsigned int suiteb_flags = tls1_suiteb(s);
	if (len != 3 || p[0] != NAMED_CURVE_TYPE)
		return 0;
	/* Check curve matches Suite B preferences */
	if (suiteb_flags)
		{
		unsigned long cid = s->s3->tmp.new_cipher->id;
		if (p[1])
			return 0;
		if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
			{
			if (p[2] != TLSEXT_curve_P_256)
				return 0;
			}
		else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
			{
			if (p[2] != TLSEXT_curve_P_384)
				return 0;
			}
		else	/* Should never happen */
			return 0;
		}
	tls1_get_curvelist(s, 0, &curves, &curveslen);
	for (i = 0; i < curveslen; i += 2, curves += 2)
		{
		if (p[1] == curves[0] && p[2] == curves[1])
			return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK);
		}
	return 0;
	}

Project: openssl

static int tls1_check_ec_key(SSL *s,
			unsigned char *curve_id, unsigned char *comp_id)
	{
	const unsigned char *p;
	size_t plen, i;
	int j;
	/* If point formats extension present check it, otherwise everything
	 * is supported (see RFC4492).
	 */
	if (comp_id && s->session->tlsext_ecpointformatlist)
		{
		p = s->session->tlsext_ecpointformatlist;
		plen = s->session->tlsext_ecpointformatlist_length;
		for (i = 0; i < plen; i++, p++)
			{
			if (*comp_id == *p)
				break;
			}
		if (i == plen)
			return 0;
		}
	if (!curve_id)
		return 1;
	/* Check curve is consistent with client and server preferences */
	for (j = 0; j <= 1; j++)
		{
		tls1_get_curvelist(s, j, &p, &plen);
		for (i = 0; i < plen; i+=2, p+=2)
			{
			if (p[0] == curve_id[0] && p[1] == curve_id[1])
				break;
			}
		if (i == plen)
			return 0;
		/* For clients can only check sent curve list */
		if (!s->server)
			break;
		}
	return 1;
	}

Project: openssl

int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
	{
	unsigned char curve_id[2];
	EC_KEY *ec = s->cert->ecdh_tmp;
#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
	/* Allow any curve: not just those peer supports */
	if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
		return 1;
#endif
	/* If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384,
	 * no other curves permitted.
	 */
	if (tls1_suiteb(s))
		{
		/* Curve to check determined by ciphersuite */
		if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
			curve_id[1] = TLSEXT_curve_P_256;
		else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
			curve_id[1] = TLSEXT_curve_P_384;
		else
			return 0;
		curve_id[0] = 0;
		/* Check this curve is acceptable */
		if (!tls1_check_ec_key(s, curve_id, NULL))
			return 0;
		/* If auto or setting curve from callback assume OK */
		if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
			return 1;
		/* Otherwise check curve is acceptable */
		else 
			{
			unsigned char curve_tmp[2];
			if (!ec)
				return 0;
			if (!tls1_set_ec_id(curve_tmp, NULL, ec))
				return 0;
			if (!curve_tmp[0] || curve_tmp[1] == curve_id[1])
				return 1;
			return 0;
			}
			
		}
	if (s->cert->ecdh_tmp_auto)
		{
		/* Need a shared curve */
		if (tls1_shared_curve(s, 0))
			return 1;
		else return 0;
		}
	if (!ec)
		{
		if (s->cert->ecdh_tmp_cb)
			return 1;
		else
			return 0;
		}
	if (!tls1_set_ec_id(curve_id, NULL, ec))
		return 0;
/* Set this to allow use of invalid curves for testing */
#if 0
	return 1;
#else
	return tls1_check_ec_key(s, curve_id, NULL);
#endif
	}

Project: openssl

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;
	case NID_brainpoolP256r1:  /* brainpoolP256r1 (26) */
		return 26;
	case NID_brainpoolP384r1:  /* brainpoolP384r1 (27) */
		return 27;
	case NID_brainpoolP512r1:  /* brainpool512r1 (28) */
		return 28;
	default:
		return 0;
		}
	}

Project: openssl

static void tls1_get_curvelist(SSL *s, int sess,
					const unsigned char **pcurves,
					size_t *pcurveslen)
	{
	if (sess)
		{
		*pcurves = s->session->tlsext_ellipticcurvelist;
		*pcurveslen = s->session->tlsext_ellipticcurvelist_length;
		return;
		}
	/* For Suite B mode only include P-256, P-384 */
	switch (tls1_suiteb(s))
		{
	case SSL_CERT_FLAG_SUITEB_128_LOS:
		*pcurves = suiteb_curves;
		*pcurveslen = sizeof(suiteb_curves);
		break;

	case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
		*pcurves = suiteb_curves;
		*pcurveslen = 2;
		break;

	case SSL_CERT_FLAG_SUITEB_192_LOS:
		*pcurves = suiteb_curves + 2;
		*pcurveslen = 2;
		break;
	default:
		*pcurves = s->tlsext_ellipticcurvelist;
		*pcurveslen = s->tlsext_ellipticcurvelist_length;
		}
	if (!*pcurves)
		{
		*pcurves = eccurves_default;
		*pcurveslen = sizeof(eccurves_default);
		}
	}

Project: openssl

static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
					size_t *pformatslen)
	{
	/* If we have a custom point format list use it otherwise
	 * use default */
	if (s->tlsext_ecpointformatlist)
		{
		*pformats = s->tlsext_ecpointformatlist;
		*pformatslen = s->tlsext_ecpointformatlist_length;
		}
	else
		{
		*pformats = ecformats_default;
		/* For Suite B we don't support char2 fields */
		if (tls1_suiteb(s))
			*pformatslen = sizeof(ecformats_default) - 1;
		else
			*pformatslen = sizeof(ecformats_default);
		}
	}

Project: openssl

tls1_heartbeat(SSL *s)
	{
	unsigned char *buf, *p;
	int ret;
	unsigned int payload = 18; /* Sequence number + random bytes */
	unsigned int padding = 16; /* Use minimum padding */

	/* Only send if peer supports and accepts HB requests... */
	if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
	    s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
		{
		SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
		return -1;
		}

	/* ...and there is none in flight yet... */
	if (s->tlsext_hb_pending)
		{
		SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
		return -1;
		}
		
	/* ...and no handshake in progress. */
	if (SSL_in_init(s) || s->in_handshake)
		{
		SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
		return -1;
		}
		
	/* Check if padding is too long, payload and padding
	 * must not exceed 2^14 - 3 = 16381 bytes in total.
	 */
	OPENSSL_assert(payload + padding <= 16381);

	/* Create HeartBeat message, we just use a sequence number
	 * as payload to distuingish different messages and add
	 * some random stuff.
	 *  - Message Type, 1 byte
	 *  - Payload Length, 2 bytes (unsigned int)
	 *  - Payload, the sequence number (2 bytes uint)
	 *  - Payload, random bytes (16 bytes uint)
	 *  - Padding
	 */
	buf = OPENSSL_malloc(1 + 2 + payload + padding);
	p = buf;
	/* Message Type */
	*p++ = TLS1_HB_REQUEST;
	/* Payload length (18 bytes here) */
	s2n(payload, p);
	/* Sequence number */
	s2n(s->tlsext_hb_seq, p);
	/* 16 random bytes */
	RAND_pseudo_bytes(p, 16);
	p += 16;
	/* Random padding */
	RAND_pseudo_bytes(p, padding);

	ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
	if (ret >= 0)
		{
		if (s->msg_callback)
			s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
				buf, 3 + payload + padding,
				s, s->msg_callback_arg);

		s->tlsext_hb_pending = 1;
		}
		
	OPENSSL_free(buf);

	return ret;
	}

Project: openssl

int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
	{
	int idx;
	size_t i;
	const EVP_MD *md;
	CERT *c = s->cert;
	TLS_SIGALGS *sigptr;
	/* Extension ignored for inappropriate versions */
	if (!SSL_USE_SIGALGS(s))
		return 1;
	/* Should never happen */
	if (!c)
		return 0;

	if (c->peer_sigalgs)
		OPENSSL_free(c->peer_sigalgs);
	c->peer_sigalgs = OPENSSL_malloc(dsize);
	if (!c->peer_sigalgs)
		return 0;
	c->peer_sigalgslen = dsize;
	memcpy(c->peer_sigalgs, data, dsize);

	tls1_set_shared_sigalgs(s);

#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
	if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
		{
		/* Use first set signature preference to force message
		 * digest, ignoring any peer preferences.
		 */
		const unsigned char *sigs = NULL;
		if (s->server)
			sigs = c->conf_sigalgs;
		else
			sigs = c->client_sigalgs;
		if (sigs)
			{
			idx = tls12_get_pkey_idx(sigs[1]);
			md = tls12_get_hash(sigs[0]);
			c->pkeys[idx].digest = md;
			c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
			if (idx == SSL_PKEY_RSA_SIGN)
				{
				c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
				c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
				}
			}
		}
#endif

	for (i = 0, sigptr = c->shared_sigalgs;
			i < c->shared_sigalgslen; i++, sigptr++)
		{
		idx = tls12_get_pkey_idx(sigptr->rsign);
		if (idx > 0 && c->pkeys[idx].digest == NULL)
			{
			md = tls12_get_hash(sigptr->rhash);
			c->pkeys[idx].digest = md;
			c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
			if (idx == SSL_PKEY_RSA_SIGN)
				{
				c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
				c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
				}
			}

		}
	/* In strict mode leave unset digests as NULL to indicate we can't
	 * use the certificate for signing.
	 */
	if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
		{
		/* Set any remaining keys to default values. NOTE: if alg is
		 * not supported it stays as NULL.
	 	 */
#ifndef OPENSSL_NO_DSA
		if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
			c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
#endif
#ifndef OPENSSL_NO_RSA
		if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
			{
			c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
			c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
			}
#endif
#ifndef OPENSSL_NO_ECDSA
		if (!c->pkeys[SSL_PKEY_ECC].digest)
			c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
#endif
		}
	return 1;
	}

Project: openssl

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;

	*ret = NULL;
	s->tlsext_ticket_expected = 0;

	/* If tickets disabled behave as if no ticket present
	 * to permit stateful resumption.
	 */
	if (!tls_use_ticket(s))
		return 0;
	if ((s->version <= SSL3_VERSION) || !limit)
		return 0;
	if (p >= limit)
		return -1;
	/* Skip past DTLS cookie */
	if (SSL_IS_DTLS(s))
		{
		i = *(p++);
		p+= i;
		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 0;
	n2s(p, i);
	while ((p + 4) <= limit)
		{
		unsigned short type, size;
		n2s(p, type);
		n2s(p, size);
		if (p + size > limit)
			return 0;
		if (type == TLSEXT_TYPE_session_ticket)
			{
			int r;
			if (size == 0)
				{
				/* The client will accept a ticket but doesn't
				 * currently have one. */
				s->tlsext_ticket_expected = 1;
				return 1;
				}
			if (s->tls_session_secret_cb)
				{
				/* Indicate that the ticket couldn't be
				 * decrypted rather than generating the session
				 * from ticket now, trigger abbreviated
				 * handshake based on external mechanism to
				 * calculate the master secret later. */
				return 2;
				}
			r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
			switch (r)
				{
				case 2: /* ticket couldn't be decrypted */
					s->tlsext_ticket_expected = 1;
					return 2;
				case 3: /* ticket was decrypted */
					return r;
				case 4: /* ticket decrypted but need to renew */
					s->tlsext_ticket_expected = 1;
					return 3;
				default: /* fatal error */
					return -1;
				}
			}
		p += size;
		}
	return 0;
	}

Project: openssl

int tls1_set_curves(unsigned char **pext, size_t *pextlen,
			int *curves, size_t ncurves)
	{
	unsigned char *clist, *p;
	size_t i;
	/* Bitmap of curves included to detect duplicates: only works
	 * while curve ids < 32 
	 */
	unsigned long dup_list = 0;
	clist = OPENSSL_malloc(ncurves * 2);
	if (!clist)
		return 0;
	for (i = 0, p = clist; i < ncurves; i++)
		{
		unsigned long idmask;
		int id;
		id = tls1_ec_nid2curve_id(curves[i]);
		idmask = 1L << id;
		if (!id || (dup_list & idmask))
			{
			OPENSSL_free(clist);
			return 0;
			}
		dup_list |= idmask;
		s2n(id, p);
		}
	if (*pext)
		OPENSSL_free(*pext);
	*pext = clist;
	*pextlen = ncurves * 2;
	return 1;
	}

Project: openssl

int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
	{
	unsigned char *sigalgs, *sptr;
	int rhash, rsign;
	size_t i;
	if (salglen & 1)
		return 0;
	sigalgs = OPENSSL_malloc(salglen);
	if (sigalgs == NULL)
		return 0;
	for (i = 0, sptr = sigalgs; i < salglen; i+=2)
		{
		rhash = tls12_find_id(*psig_nids++, tls12_md,
					sizeof(tls12_md)/sizeof(tls12_lookup));
		rsign = tls12_find_id(*psig_nids++, tls12_sig,
				sizeof(tls12_sig)/sizeof(tls12_lookup));

		if (rhash == -1 || rsign == -1)
			goto err;
		*sptr++ = rhash;
		*sptr++ = rsign;
		}

	if (client)
		{
		if (c->client_sigalgs)
			OPENSSL_free(c->client_sigalgs);
		c->client_sigalgs = sigalgs;
		c->client_sigalgslen = salglen;
		}
	else
		{
		if (c->conf_sigalgs)
			OPENSSL_free(c->conf_sigalgs);
		c->conf_sigalgs = sigalgs;
		c->conf_sigalgslen = salglen;
		}

	return 1;

	err:
	OPENSSL_free(sigalgs);
	return 0;
	}

Project: openssl

static int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
	{
	tls_curve_info *cinfo;
	if (curve[0])
		return 1;
	if ((curve[1] < 1) || ((size_t)curve[1] >
				sizeof(nid_list)/sizeof(nid_list[0])))
		return 0;
	cinfo = &nid_list[curve[1]-1];
	return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
	}

Project: openssl

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;
	int slen, mlen, renew_ticket = 0;
	unsigned char tick_hmac[EVP_MAX_MD_SIZE];
	HMAC_CTX hctx;
	EVP_CIPHER_CTX ctx;
	SSL_CTX *tctx = s->initial_ctx;
	/* Need at least keyname + iv + some encrypted data */
	if (eticklen < 48)
		return 2;
	/* Initialize session ticket encryption and HMAC contexts */
	HMAC_CTX_init(&hctx);
	EVP_CIPHER_CTX_init(&ctx);
	if (tctx->tlsext_ticket_key_cb)
		{
		unsigned char *nctick = (unsigned char *)etick;
		int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
							&ctx, &hctx, 0);
		if (rv < 0)
			return -1;
		if (rv == 0)
			return 2;
		if (rv == 2)
			renew_ticket = 1;
		}
	else
		{
		/* Check key name matches */
		if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
			return 2;
		HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
					tlsext_tick_md(), NULL);
		EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
				tctx->tlsext_tick_aes_key, etick + 16);
		}
	/* Attempt to process session ticket, first conduct sanity and
	 * integrity checks on ticket.
	 */
	mlen = HMAC_size(&hctx);
	if (mlen < 0)
		{
		EVP_CIPHER_CTX_cleanup(&ctx);
		return -1;
		}
	eticklen -= mlen;
	/* Check HMAC of encrypted ticket */
	HMAC_Update(&hctx, etick, eticklen);
	HMAC_Final(&hctx, tick_hmac, NULL);
	HMAC_CTX_cleanup(&hctx);
	if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
		return 2;
	/* Attempt to decrypt session data */
	/* Move p after IV to start of encrypted ticket, update length */
	p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
	eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
	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)
		{
		EVP_CIPHER_CTX_cleanup(&ctx);
		OPENSSL_free(sdec);
		return 2;
		}
	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;
		if (renew_ticket)
			return 4;
		else
			return 3;
		}
        ERR_clear_error();
	/* For session parse failure, indicate that we need to send a new
	 * ticket. */
	return 2;
	}