Session cache implementations shouldn't have to access SSL_SESSION

elements directly, so this missing functionality is required.

PR: 276

ssl/ssl.h

@@ -1266,6 +1266,7 @@ void	SSL_copy_session_id(SSL *to,SSL *from);
 SSL_SESSION *SSL_SESSION_new(void);
 unsigned long SSL_SESSION_hash(SSL_SESSION *a);
 int	SSL_SESSION_cmp(SSL_SESSION *a,SSL_SESSION *b);
+const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len);
 #ifndef OPENSSL_NO_FP_API
 int	SSL_SESSION_print_fp(FILE *fp,SSL_SESSION *ses);
 #endif

ssl/ssl_sess.c

@@ -127,6 +127,13 @@ SSL_SESSION *SSL_SESSION_new(void)
 	return(ss);
 	}
 
+const unsigned char *SSL_SESSION_get_id(const SSL_SESSION *s, unsigned int *len)
+	{
+	if(len)
+		*len = s->session_id_length;
+	return s->session_id;
+	}
+
 /* Even with SSLv2, we have 16 bytes (128 bits) of session ID space. SSLv3/TLSv1
  * has 32 bytes (256 bits). As such, filling the ID with random gunk repeatedly
  * until we have no conflict is going to complete in one iteration pretty much