check_http: check for and print the certificate cn

[nagiosplug.git] / plugins / sslutils.c

diff --git a/plugins/sslutils.c b/plugins/sslutils.c
index 3d4f90166dd7d3cb1754dfa5516164e3337ff7eb..0bc61ed330fafcdb0720045cdd04e83b080e9ce9 100644 (file)
--- a/plugins/sslutils.c
+++ b/plugins/sslutils.c
@@ -3,9 +3,7 @@
 * Nagios plugins SSL utilities
 * 
 * License: GPL
-* Copyright (c) 2005-2007 Nagios Plugins Development Team
-* 
-* Last Modified: $Date$
+* Copyright (c) 2005-2010 Nagios Plugins Development Team
 * 
 * Description:
 * 
@@ -25,10 +23,10 @@
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
-* $Id$
 * 
 *****************************************************************************/
 
+#define MAX_CN_LENGTH 256
 #define LOCAL_TIMEOUT_ALARM_HANDLER
 #include "common.h"
 #include "netutils.h"
@@ -38,7 +36,11 @@ 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 ();
@@ -51,6 +53,10 @@ 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;
@@ -68,6 +74,9 @@ 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) {
@@ -89,9 +98,15 @@ int np_net_ssl_read(void *buf, int num){
 int np_net_ssl_check_cert(int days_till_exp){
 #  ifdef USE_OPENSSL
        X509 *certificate=NULL;
-        ASN1_STRING *tm;
+       X509_NAME *subj=NULL;
+       char cn[MAX_CN_LENGTH]= "";
+       int cnlen =-1;
+       int status=STATE_UNKNOWN;
+
+       ASN1_STRING *tm;
        int offset;
        struct tm stamp;
+       float time_left;
        int days_left;
        char timestamp[17] = "";
 
@@ -101,6 +116,17 @@ int np_net_ssl_check_cert(int days_till_exp){
                return STATE_CRITICAL;
        }
 
+       /* Extract CN from certificate subject */
+       subj=X509_get_subject_name(certificate);
+
+       if(! subj){
+               printf ("%s\n",_("CRITICAL - Cannot retrieve certificate subject."));
+               return STATE_CRITICAL;
+       }
+       cnlen = X509_NAME_get_text_by_NID (subj, NID_commonName, cn, sizeof(cn));
+       if ( cnlen == -1 )
+               strcpy(cn , _("Unknown CN"));
+
        /* Retrieve timestamp of certificate */
        tm = X509_get_notAfter (certificate);
 
@@ -138,26 +164,28 @@ int np_net_ssl_check_cert(int days_till_exp){
        stamp.tm_sec = 0;
        stamp.tm_isdst = -1;
 
-       days_left = (mktime (&stamp) - time (NULL)) / 86400;
+       time_left = difftime(timegm(&stamp), time(NULL));
+       days_left = time_left / 86400;
        snprintf
                (timestamp, 17, "%02d/%02d/%04d %02d:%02d",
                 stamp.tm_mon + 1,
                 stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
 
        if (days_left > 0 && days_left <= days_till_exp) {
-               printf (_("WARNING - Certificate expires in %d day(s) (%s).\n"), days_left, timestamp);
-               return STATE_WARNING;
-       } else if (days_left < 0) {
-               printf (_("CRITICAL - Certificate expired on %s.\n"), timestamp);
-               return STATE_CRITICAL;
+               printf (_("WARNING - Certificate '%s' expires in %d day(s) (%s).\n"), cn, days_left, timestamp);
+               status=STATE_WARNING;
+       } else if (time_left < 0) {
+               printf (_("CRITICAL - Certificate '%s' expired on %s.\n"), cn, timestamp);
+               status=STATE_CRITICAL;
        } else if (days_left == 0) {
-               printf (_("WARNING - Certificate expires today (%s).\n"), timestamp);
-               return STATE_WARNING;
+               printf (_("WARNING - Certificate '%s' expires today (%s).\n"), cn, timestamp);
+               status=STATE_WARNING;
+       } else {
+               printf (_("OK - Certificate '%s' will expire on %s.\n"), cn, timestamp);
+               status=STATE_OK;
        }
-
-       printf (_("OK - Certificate will expire on %s.\n"), timestamp);
        X509_free (certificate);
-       return STATE_OK;
+       return status;
 #  else /* ifndef USE_OPENSSL */
        printf ("%s\n", _("WARNING - Plugin does not support checking certificates."));
        return STATE_WARNING;