Disable stateless SSL session resumption

Some versions of OpenSSL fail to negotiate the SSL connection with at
least some versions of Tomcat if stateless SSL session resumption
support (see RFC4507) is enabled:

| CRITICAL - Cannot make SSL connection
| 140099330348712:error:140943F2:SSL routines:SSL3_READ_BYTES:sslv3 alert unexpected message:s3_pkt.c:1195:SSL alert number 10

The problem is reproducible with OpenSSL 1.0.0h, but not with OpenSSL
0.9.8o-4squeeze12 (as shipped with Debian 6.0.4).  We work around it by
disabling the RFC4507 functionality when using OpenSSL versions which
support it.

Thanks to Dag Bakke for reporting the issue and for giving me access to
a server I could use to reproduce the problem.

NEWS

@@ -20,6 +20,7 @@ This file documents the major additions and syntax changes between releases.
 	Fix check_procs where regex input of '|' would get displayed in output - now replaced with ','
 	Fix segfault in check_host when hostname returns multiple IP addresses (Sebastian Harl)
 	Fix check_smtp and check_tcp where duplicate messages were displayed for certificate errors
+	Disable RFC4507 support, to work around SSL negotiation issues with (at least) some Tomcat versions
 
 1.4.15 27th July 2010
 	ENHANCEMENTS

plugins/sslutils.c

@@ -52,6 +52,9 @@ int np_net_ssl_init_with_hostname (int sd, char *host_name) {
 				printf ("%s\n", _("CRITICAL - Cannot create SSL context."));
 				return STATE_CRITICAL;
 		}
+#ifdef SSL_OP_NO_TICKET
+		SSL_CTX_set_options(c, SSL_OP_NO_TICKET);
+#endif
 		if ((s = SSL_new (c)) != NULL){
 #ifdef SSL_set_tlsext_host_name
 				if (host_name != NULL)