X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=ssl%2Ft1_lib.c;h=1c4e151fe184ebc9d5594c1e8915b8b83e719662;hp=a1f1a486938ebfb7322375de8b7a156b1e16265a;hb=afdbadc704e20c71adbdd012ba470efd32174ec1;hpb=9cb0969f657bcc297430fefb9a51e78c52703121

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index a1f1a48693..1c4e151fe1 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -57,18 +57,20 @@
  */
 
 #include <stdio.h>
-#include "objects.h"
+#include <openssl/objects.h>
+#include <openssl/evp.h>
+#include <openssl/hmac.h>
 #include "ssl_locl.h"
 
-char *tls1_version_str="TLSv1 part of OpenSSL 0.9.2 31-Dec-1998";
+const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
 
-#ifndef NO_PROTO
-static long tls1_default_timeout(void);
-#else
-static long tls1_default_timeout();
+#ifndef OPENSSL_NO_TLSEXT
+static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
+				const unsigned char *sess_id, int sesslen,
+				SSL_SESSION **psess);
 #endif
 
-static SSL3_ENC_METHOD TLSv1_enc_data={
+SSL3_ENC_METHOD TLSv1_enc_data={
 	tls1_enc,
 	tls1_mac,
 	tls1_setup_key_block,
@@ -82,71 +84,547 @@ static SSL3_ENC_METHOD TLSv1_enc_data={
 	tls1_alert_code,
 	};
 
-static SSL_METHOD TLSv1_data= {
-	TLS1_VERSION,
-	tls1_new,
-	tls1_clear,
-	tls1_free,
-	ssl_undefined_function,
-	ssl_undefined_function,
-	ssl3_read,
-	ssl3_peek,
-	ssl3_write,
-	ssl3_shutdown,
-	ssl3_renegotiate,
-	ssl3_renegotiate_check,
-	ssl3_ctrl,
-	ssl3_ctx_ctrl,
-	ssl3_get_cipher_by_char,
-	ssl3_put_cipher_by_char,
-	ssl3_pending,
-	ssl3_num_ciphers,
-	ssl3_get_cipher,
-	ssl_bad_method,
-	tls1_default_timeout,
-	&TLSv1_enc_data,
-	};
-
-static long tls1_default_timeout()
+long tls1_default_timeout(void)
 	{
 	/* 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);
 	}
 
-SSL_METHOD *tlsv1_base_method()
-	{
-	return(&TLSv1_data);
-	}
+IMPLEMENT_tls1_meth_func(tlsv1_base_method,
+			ssl_undefined_function,
+			ssl_undefined_function,
+			ssl_bad_method)
 
-int tls1_new(s)
-SSL *s;
+int tls1_new(SSL *s)
 	{
 	if (!ssl3_new(s)) return(0);
 	s->method->ssl_clear(s);
 	return(1);
 	}
 
-void tls1_free(s)
-SSL *s;
+void tls1_free(SSL *s)
 	{
 	ssl3_free(s);
 	}
 
-void tls1_clear(s)
-SSL *s;
+void tls1_clear(SSL *s)
 	{
 	ssl3_clear(s);
 	s->version=TLS1_VERSION;
 	}
 
 #if 0
-long tls1_ctrl(s,cmd,larg,parg)
-SSL *s;
-int cmd;
-long larg;
-char *parg;
+long tls1_ctrl(SSL *s, int cmd, long larg, char *parg)
+	{
+	return(0);
+	}
+
+long tls1_callback_ctrl(SSL *s, int cmd, void *(*fp)())
 	{
 	return(0);
 	}
 #endif
+
+#ifndef OPENSSL_NO_TLSEXT
+unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
+	{
+	int extdatalen=0;
+	unsigned char *ret = p;
+
+	ret+=2;
+
+	if (ret>=limit) return NULL; /* this really never occurs, but ... */
+
+ 	if (s->tlsext_hostname != NULL)
+		{ 
+		/* Add TLS extension servername to the Client Hello message */
+		unsigned long size_str;
+		long lenmax; 
+
+		/* check for enough space.
+		   4 for the servername type and entension length
+		   2 for servernamelist length
+		   1 for the hostname type
+		   2 for hostname length
+		   + hostname length 
+		*/
+		   
+		if ((lenmax = limit - p - 9) < 0 
+		|| (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax) 
+			return NULL;
+			
+		/* extension type and length */
+		s2n(TLSEXT_TYPE_server_name,ret); 
+		s2n(size_str+5,ret);
+		
+		/* length of servername list */
+		s2n(size_str+3,ret);
+	
+		/* hostname type, length and hostname */
+		*(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
+		s2n(size_str,ret);
+		memcpy(ret, s->tlsext_hostname, size_str);
+		ret+=size_str;
+
+		}
+
+	if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
+		{
+		int ticklen;
+		if (s->session && s->session->tlsext_tick)
+			ticklen = s->session->tlsext_ticklen;
+		else
+			ticklen = 0;
+		/* Check for enough room 2 for extension type, 2 for len
+ 		 * rest for ticket
+  		 */
+		if (limit - p - 4 - ticklen < 0)
+			return NULL;
+		s2n(TLSEXT_TYPE_session_ticket,ret); 
+		s2n(ticklen,ret);
+		if (ticklen)
+			{
+			memcpy(ret, s->session->tlsext_tick, ticklen);
+			ret += ticklen;
+			}
+		}
+
+	if ((extdatalen = ret-p-2)== 0) 
+		return p;
+
+	s2n(extdatalen,p);
+	return ret;
+	}
+
+unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
+	{
+	int extdatalen=0;
+	unsigned char *ret = p;
+
+	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 (limit - p - 4 < 0) return NULL; 
+
+		s2n(TLSEXT_TYPE_server_name,ret);
+		s2n(0,ret);
+		}
+	
+	if (s->tlsext_ticket_expected
+		&& !(SSL_get_options(s) & SSL_OP_NO_TICKET)) 
+		{ 
+		if (limit - p - 4 < 0) return NULL; 
+		s2n(TLSEXT_TYPE_session_ticket,ret);
+		s2n(0,ret);
+		}
+		
+	if ((extdatalen = ret-p-2)== 0) 
+		return p;
+
+	s2n(extdatalen,p);
+	return ret;
+	}
+
+int ssl_parse_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;
+	s->servername_done = 0;
+
+	if (data >= (d+n-2))
+		return 1;
+	n2s(data,len);
+
+	if (data > (d+n-len)) 
+		return 1;
+
+	while (data <= (d+n-4))
+		{
+		n2s(data,type);
+		n2s(data,size);
+
+		if (data+size > (d+n))
+	   		return 1;
+
+		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->session->tlsext_hostname == NULL)
+						{
+						if (len > TLSEXT_MAXLEN_host_name || 
+							((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
+							{
+							*al = TLS1_AD_UNRECOGNIZED_NAME;
+							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);
+							*al = TLS1_AD_UNRECOGNIZED_NAME;
+							return 0;
+						}
+						s->servername_done = 1; 
+
+						}
+					else 
+						s->servername_done = 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;
+				}
+
+			}
+		/* session ticket processed earlier */
+
+		data+=size;		
+		}
+
+	*p = data;
+	return 1;
+	}
+
+int ssl_parse_serverhello_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 tlsext_servername = 0;
+
+	if (data >= (d+n-2))
+		return 1;
+
+	n2s(data,len);
+
+	while(data <= (d+n-4))
+		{
+		n2s(data,type);
+		n2s(data,size);
+
+		if (data+size > (d+n))
+	   		return 1;
+
+		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;   
+			}
+		else if (type == TLSEXT_TYPE_session_ticket)
+			{
+			if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
+				|| (size > 0))
+				{
+				*al = TLS1_AD_UNSUPPORTED_EXTENSION;
+				return 0;
+				}
+			s->tlsext_ticket_expected = 1;
+			}
+
+		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;
+	return 1;
+	}
+
+int ssl_check_clienthello_tlsext(SSL *s)
+	{
+	int ret=SSL_TLSEXT_ERR_NOACK;
+	int al = SSL_AD_UNRECOGNIZED_NAME;
+
+	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);
+
+	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; 
+					
+		case SSL_TLSEXT_ERR_NOACK:
+			s->servername_done=0;
+			default:
+		return 1;
+		}
+	}
+
+int ssl_check_serverhello_tlsext(SSL *s)
+	{
+	int ret=SSL_TLSEXT_ERR_NOACK;
+	int al = SSL_AD_UNRECOGNIZED_NAME;
+
+	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);
+
+	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; 
+					
+		case SSL_TLSEXT_ERR_NOACK:
+			s->servername_done=0;
+			default:
+		return 1;
+		}
+	}
+
+/* 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;
+	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)
+				return 0;
+			/* If zero length not client will accept a ticket
+ 			 * and indicate cache miss to trigger full handshake
+ 			 */
+			if (size == 0)
+				{
+				s->tlsext_ticket_expected = 1;
+				return 0;	/* Cache miss */
+				}
+			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;
+	int slen, mlen;
+	unsigned char tick_hmac[EVP_MAX_MD_SIZE];
+	HMAC_CTX hctx;
+	EVP_CIPHER_CTX ctx;
+	/* Attempt to process session ticket, first conduct sanity and
+ 	 * integrity checks on ticket.
+ 	 */
+	mlen = EVP_MD_size(tlsext_tick_md());
+	eticklen -= mlen;
+	/* Need at least keyname + iv + some encrypted data */
+	if (eticklen < 48)
+		goto tickerr;
+	/* Check key name matches */
+	if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
+		goto tickerr;
+	/* Check HMAC of encrypted ticket */
+	HMAC_CTX_init(&hctx);
+	HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
+				tlsext_tick_md(), NULL);
+	HMAC_Update(&hctx, etick, eticklen);
+	HMAC_Final(&hctx, tick_hmac, NULL);
+	HMAC_CTX_cleanup(&hctx);
+	if (memcmp(tick_hmac, etick + eticklen, mlen))
+		goto tickerr;
+	/* Set p to start of IV */
+	p = etick + 16;
+	EVP_CIPHER_CTX_init(&ctx);
+	/* Attempt to decrypt session data */
+	EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
+					s->ctx->tlsext_tick_aes_key, p);
+	/* Move p after IV to start of encrypted ticket, update length */
+	p += 16;
+	eticklen -= 32;
+	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;
+		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