X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=ssl%2Fs23_clnt.c;h=fa20c1c3bd7b4c5f02cfb1a35e97a88580476876;hp=78c39d9af558bf1137a52017f33aad913cc4cccc;hb=4082fea81c150e9f2643819148d275e500f309a3;hpb=67c8e7f41486934b6809673b6d836d38eaf2383b

diff --git a/ssl/s23_clnt.c b/ssl/s23_clnt.c
index 78c39d9af5..fa20c1c3bd 100644
--- a/ssl/s23_clnt.c
+++ b/ssl/s23_clnt.c
@@ -129,6 +129,10 @@ static const SSL_METHOD *ssl23_get_client_method(int ver)
 		return(SSLv3_client_method());
 	else if (ver == TLS1_VERSION)
 		return(TLSv1_client_method());
+	else if (ver == TLS1_1_VERSION)
+		return(TLSv1_1_client_method());
+	else if (ver == TLS1_2_VERSION)
+		return(TLSv1_2_client_method());
 	else
 		return(NULL);
 	}
@@ -250,33 +254,102 @@ end:
 	return(ret);
 	}
 
+static int ssl23_no_ssl2_ciphers(SSL *s)
+	{
+	SSL_CIPHER *cipher;
+	STACK_OF(SSL_CIPHER) *ciphers;
+	int i;
+	ciphers = SSL_get_ciphers(s);
+	for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++)
+		{
+		cipher = sk_SSL_CIPHER_value(ciphers, i);
+		if (cipher->algorithm_ssl == SSL_SSLV2)
+			return 0;
+		}
+	return 1;
+	}
+
+/* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0
+ * on failure, 1 on success. */
+int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len)
+	{
+		int send_time = 0;
+		if (len < 4)
+			return 0;
+		if (server)
+			send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0;
+		else
+			send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0;
+		if (send_time)
+			{
+			unsigned long Time = time(NULL);
+			unsigned char *p = result;
+			l2n(Time, p);
+			return RAND_pseudo_bytes(p, len-4);
+			}
+		else
+			return RAND_pseudo_bytes(result, len);
+	}
 
 static int ssl23_client_hello(SSL *s)
 	{
 	unsigned char *buf;
 	unsigned char *p,*d;
-	int i,j,ch_len;
-	unsigned long Time,l;
+	int i,ch_len;
+	unsigned long l;
 	int ssl2_compat;
 	int version = 0, version_major, version_minor;
+#ifndef OPENSSL_NO_COMP
+	int j;
 	SSL_COMP *comp;
+#endif
 	int ret;
+	unsigned long mask, options = s->options;
+
+	ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1;
+
+	if (ssl2_compat && ssl23_no_ssl2_ciphers(s))
+		ssl2_compat = 0;
+
+	/*
+	 * SSL_OP_NO_X disables all protocols above X *if* there are
+	 * some protocols below X enabled. This is required in order
+	 * to maintain "version capability" vector contiguous. So
+	 * that if application wants to disable TLS1.0 in favour of
+	 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the
+	 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2.
+	 */
+	mask =	SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1
+#if !defined(OPENSSL_NO_SSL3)
+		|SSL_OP_NO_SSLv3
+#endif
+#if !defined(OPENSSL_NO_SSL2)
+		|(ssl2_compat?SSL_OP_NO_SSLv2:0)
+#endif
+		;
+#if !defined(OPENSSL_NO_TLS1_2_CLIENT)
+	version = TLS1_2_VERSION;
 
-	ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
-
-	if (!(s->options & SSL_OP_NO_TLSv1))
-		{
+	if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask)
+		version = TLS1_1_VERSION;
+#else
+	version = TLS1_1_VERSION;
+#endif
+	mask &= ~SSL_OP_NO_TLSv1_1;
+	if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask)
 		version = TLS1_VERSION;
-		}
-	else if (!(s->options & SSL_OP_NO_SSLv3))
-		{
+	mask &= ~SSL_OP_NO_TLSv1;
+#if !defined(OPENSSL_NO_SSL3)
+	if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask)
 		version = SSL3_VERSION;
-		}
-	else if (!(s->options & SSL_OP_NO_SSLv2))
-		{
+	mask &= ~SSL_OP_NO_SSLv3;
+#endif
+#if !defined(OPENSSL_NO_SSL2)
+	if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask)
 		version = SSL2_VERSION;
-		}
+#endif
 
+#ifndef OPENSSL_NO_TLSEXT
 	if (version != SSL2_VERSION)
 		{
 		/* have to disable SSL 2.0 compatibility if we need TLS extensions */
@@ -285,12 +358,16 @@ static int ssl23_client_hello(SSL *s)
 			ssl2_compat = 0;
 		if (s->tlsext_status_type != -1)
 			ssl2_compat = 0;
-		
 #ifdef TLSEXT_TYPE_opaque_prf_input
 		if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL)
 			ssl2_compat = 0;
 #endif
+		if (s->ctx->custom_cli_ext_records_count != 0)
+			ssl2_compat = 0;
+		if (s->ctx->cli_supp_data_records_count != 0)
+			ssl2_compat = 0;
 		}
+#endif
 
 	buf=(unsigned char *)s->init_buf->data;
 	if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
@@ -304,16 +381,38 @@ static int ssl23_client_hello(SSL *s)
 #endif
 
 		p=s->s3->client_random;
-		Time=(unsigned long)time(NULL);		/* Time */
-		l2n(Time,p);
-		if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
+		if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
 			return -1;
 
-		if (version == TLS1_VERSION)
+		if (version == TLS1_2_VERSION)
+			{
+			version_major = TLS1_2_VERSION_MAJOR;
+			version_minor = TLS1_2_VERSION_MINOR;
+			}
+		else if (tls1_suiteb(s))
+			{
+			SSLerr(SSL_F_SSL23_CLIENT_HELLO,
+					SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
+			return -1;
+			}
+		else if (version == TLS1_1_VERSION)
+			{
+			version_major = TLS1_1_VERSION_MAJOR;
+			version_minor = TLS1_1_VERSION_MINOR;
+			}
+		else if (version == TLS1_VERSION)
 			{
 			version_major = TLS1_VERSION_MAJOR;
 			version_minor = TLS1_VERSION_MINOR;
 			}
+#ifdef OPENSSL_FIPS
+		else if(FIPS_mode())
+			{
+			SSLerr(SSL_F_SSL23_CLIENT_HELLO,
+					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
+			return -1;
+			}
+#endif
 		else if (version == SSL3_VERSION)
 			{
 			version_major = SSL3_VERSION_MAJOR;
@@ -367,6 +466,10 @@ static int ssl23_client_hello(SSL *s)
 				ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 
 			/* write out sslv2 challenge */
+			/* Note that ch_len must be <= SSL3_RANDOM_SIZE (32),
+			   because it is one of SSL2_MAX_CHALLENGE_LENGTH (32)
+			   or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the
+			   check in for futurproofing */
 			if (SSL3_RANDOM_SIZE < ch_len)
 				i=SSL3_RANDOM_SIZE;
 			else
@@ -413,6 +516,15 @@ static int ssl23_client_hello(SSL *s)
 				SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 				return -1;
 				}
+#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
+			/* Some servers hang if client hello > 256 bytes
+			 * as hack workaround chop number of supported ciphers
+			 * to keep it well below this if we use TLS v1.2
+			 */
+			if (TLS1_get_version(s) >= TLS1_2_VERSION
+				&& i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
+				i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
+#endif
 			s2n(i,p);
 			p+=i;
 
@@ -467,8 +579,13 @@ static int ssl23_client_hello(SSL *s)
 			d=buf;
 			*(d++) = SSL3_RT_HANDSHAKE;
 			*(d++) = version_major;
-			*(d++) = version_minor; /* arguably we should send the *lowest* suported version here
-			                         * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
+			/* Some servers hang if we use long client hellos
+			 * and a record number > TLS 1.0.
+			 */
+			if (TLS1_get_client_version(s) > TLS1_VERSION)
+				*(d++) = 1;
+			else
+				*(d++) = version_minor;
 			s2n((int)l,d);
 
 			/* number of bytes to write */
@@ -492,7 +609,10 @@ static int ssl23_client_hello(SSL *s)
 		if (ssl2_compat)
 			s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
 		else
+			{
+			s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, s, s->msg_callback_arg);
 			s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
+			}
 		}
 
 	return ret;
@@ -543,6 +663,10 @@ static int ssl23_get_server_hello(SSL *s)
 			ch_len=SSL2_MAX_CHALLENGE_LENGTH;
 
 		/* write out sslv2 challenge */
+		/* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because
+		   it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or
+		   SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for
+		   futurproofing */
 		i=(SSL3_RANDOM_SIZE < ch_len)
 			?SSL3_RANDOM_SIZE:ch_len;
 		s->s2->challenge_length=i;
@@ -580,7 +704,7 @@ static int ssl23_get_server_hello(SSL *s)
 #endif
 		}
 	else if (p[1] == SSL3_VERSION_MAJOR &&
-	         (p[2] == SSL3_VERSION_MINOR || p[2] == TLS1_VERSION_MINOR) &&
+	         p[2] <= TLS1_2_VERSION_MINOR &&
 	         ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) ||
 	          (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2)))
 		{
@@ -589,6 +713,14 @@ static int ssl23_get_server_hello(SSL *s)
 		if ((p[2] == SSL3_VERSION_MINOR) &&
 			!(s->options & SSL_OP_NO_SSLv3))
 			{
+#ifdef OPENSSL_FIPS
+			if(FIPS_mode())
+				{
+				SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
+					SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
+				goto err;
+				}
+#endif
 			s->version=SSL3_VERSION;
 			s->method=SSLv3_client_method();
 			}
@@ -598,6 +730,18 @@ static int ssl23_get_server_hello(SSL *s)
 			s->version=TLS1_VERSION;
 			s->method=TLSv1_client_method();
 			}
+		else if ((p[2] == TLS1_1_VERSION_MINOR) &&
+			!(s->options & SSL_OP_NO_TLSv1_1))
+			{
+			s->version=TLS1_1_VERSION;
+			s->method=TLSv1_1_client_method();
+			}
+		else if ((p[2] == TLS1_2_VERSION_MINOR) &&
+			!(s->options & SSL_OP_NO_TLSv1_2))
+			{
+			s->version=TLS1_2_VERSION;
+			s->method=TLSv1_2_client_method();
+			}
 		else
 			{
 			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
@@ -624,7 +768,10 @@ static int ssl23_get_server_hello(SSL *s)
 				}
 			
 			if (s->msg_callback)
+				{
+				s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
 				s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg);
+				}
 
 			s->rwstate=SSL_NOTHING;
 			SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
@@ -640,6 +787,9 @@ static int ssl23_get_server_hello(SSL *s)
 		 * for SSLv3 */
 		s->rstate=SSL_ST_READ_HEADER;
 		s->packet_length=n;
+		if (s->s3->rbuf.buf == NULL)
+			if (!ssl3_setup_read_buffer(s))
+				goto err;
 		s->packet= &(s->s3->rbuf.buf[0]);
 		memcpy(s->packet,buf,n);
 		s->s3->rbuf.left=n;