check_http: Add SSL/TLS hostname extension support (SNI) - (#1939022 - Joe Presbrey)

3 files changed, 14 insertions, 2 deletions

diff --git a/plugins/check_http.c b/plugins/check_http.c
index 0310203..79f6adf 100644
--- a/plugins/check_http.c
+++ b/plugins/check_http.c
@@ -790,7 +790,7 @@ check_http (void)
     die (STATE_CRITICAL, _("HTTP CRITICAL - Unable to open TCP socket\n"));
 #ifdef HAVE_SSL
   if (use_ssl == TRUE) {
-    np_net_ssl_init(sd);
+    np_net_ssl_init_with_hostname(sd, host_name);
     if (check_cert == TRUE) {
       result = np_net_ssl_check_cert(days_till_exp);
       np_net_ssl_cleanup();
diff --git a/plugins/netutils.h b/plugins/netutils.h
index b479b74..572a3ae 100644
--- a/plugins/netutils.h
+++ b/plugins/netutils.h
@@ -99,6 +99,7 @@ extern int address_family;
 #ifdef HAVE_SSL
 /* maybe this could be merged with the above np_net_connect, via some flags */
 int np_net_ssl_init(int sd);
+int np_net_ssl_init_with_hostname(int sd, char *host_name);
 void np_net_ssl_cleanup();
 int np_net_ssl_write(const void *buf, int num);
 int np_net_ssl_read(void *buf, int num);
diff --git a/plugins/sslutils.c b/plugins/sslutils.c
index 1d4ef94..aa571b6 100644
--- a/plugins/sslutils.c
+++ b/plugins/sslutils.c
@@ -35,7 +35,11 @@ static SSL_CTX *c=NULL;
 static SSL *s=NULL;
 static int initialized=0;
 
-int np_net_ssl_init (int sd){
+int np_net_ssl_init (int sd) {
+    return np_net_ssl_init_with_hostname(sd, NULL);
+}
+
+int np_net_ssl_init_with_hostname (int sd, char *host_name) {
                 if (!initialized) {
                         /* Initialize SSL context */
                         SSLeay_add_ssl_algorithms ();
@@ -48,6 +52,10 @@ int np_net_ssl_init (int sd){
                                 return STATE_CRITICAL;
                 }
                 if ((s = SSL_new (c)) != NULL){
+#ifdef SSL_set_tlsext_host_name
+                                if (host_name != NULL)
+                                        SSL_set_tlsext_host_name(s, host_name);
+#endif
                                 SSL_set_fd (s, sd);
                                 if (SSL_connect(s) == 1){
                                                 return OK;
@@ -65,6 +73,9 @@ int np_net_ssl_init (int sd){
 
 void np_net_ssl_cleanup (){
                 if(s){
+#ifdef SSL_set_tlsext_host_name
+                                SSL_set_tlsext_host_name(s, NULL);
+#endif
                                 SSL_shutdown (s);
                                 SSL_free (s);
                                 if(c) {