Bugfix: In ssl3_accept, don't use a local variable 'got_new_session'

to indicate that a real handshake is taking place (the value will be
lost during multiple invocations). Set s->new_session to 2 instead.

CHANGES

@@ -12,6 +12,19 @@
          *) applies to 0.9.6a/0.9.6b/0.9.6c and 0.9.7
          +) applies to 0.9.7 only
 
+  *) The earlier bugfix for the SSL3_ST_SW_HELLO_REQ_C case of
+     ssl3_accept (ssl/s3_srvr.c) incorrectly used a local flag
+     variable as an indication that a ClientHello message has been
+     received.  As the flag value will be lost between multiple
+     invocations of ssl3_accept when using non-blocking I/O, the
+     function may not be aware that a handshake has actually taken
+     place, thus preventing a new session from being added to the
+     session cache.
+
+     To avoid this problem, we now set s->new_session to 2 instead of
+     using a local variable.
+     [Lutz Jaenicke, Bodo Moeller]
+
   *) Bugfix: Return -1 from ssl3_get_server_done (ssl3/s3_clnt.c)
      if the SSL_R_LENGTH_MISMATCH error is detected.
      [Geoff Thorpe, Bodo Moeller]

ssl/s3_clnt.c

@@ -55,6 +55,59 @@
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
+/* ====================================================================
+ * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
 
 #include <stdio.h>
 #include <openssl/buffer.h>

ssl/s3_srvr.c

@@ -56,7 +56,7 @@
  * [including the GNU Public Licence.]
  */
 /* ====================================================================
- * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -168,7 +168,6 @@ int ssl3_accept(SSL *s)
 	long num1;
 	int ret= -1;
 	int new_state,state,skip=0;
-	int got_new_session=0;
 
 	RAND_add(&Time,sizeof(Time),0);
 	ERR_clear_error();
@@ -281,7 +280,7 @@ int ssl3_accept(SSL *s)
 			s->shutdown=0;
 			ret=ssl3_get_client_hello(s);
 			if (ret <= 0) goto end;
-			got_new_session=1;
+			s->new_session = 2;
 			s->state=SSL3_ST_SW_SRVR_HELLO_A;
 			s->init_num=0;
 			break;
@@ -524,7 +523,7 @@ int ssl3_accept(SSL *s)
 
 			s->init_num=0;
 
-			if (got_new_session) /* skipped if we just sent a HelloRequest */
+			if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 				{
 				/* actually not necessarily a 'new' session unless
 				 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */

ssl/ssl.h

@@ -108,6 +108,59 @@
  * Hudson (tjh@cryptsoft.com).
  *
  */
+/* ====================================================================
+ * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    openssl-core@openssl.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
 
 #ifndef HEADER_SSL_H 
 #define HEADER_SSL_H 
@@ -715,6 +768,8 @@ struct ssl_st
 	int server;	/* are we the server side? - mostly used by SSL_clear*/
 
 	int new_session;/* 1 if we are to use a new session.
+	                 * 2 if we are a server and are inside a handshake
+	                 *   (i.e. not just sending a HelloRequest)
 	                 * NB: For servers, the 'new' session may actually be a previously
 	                 * cached session or even the previous session unless
 	                 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */

ssl/ssl_lib.c

@@ -891,7 +891,10 @@ int SSL_shutdown(SSL *s)
 
 int SSL_renegotiate(SSL *s)
 	{
-	s->new_session=1;
+	if (s->new_session == 0)
+		{
+		s->new_session=1;
+		}
 	return(s->method->ssl_renegotiate(s));
 	}