1 files changed, 78 insertions, 0 deletions

diff --git a/plugins/netutils.c b/plugins/netutils.c
index e3fbb3aa..2678f911 100644
--- a/plugins/netutils.c
+++ b/plugins/netutils.c
@@ -281,6 +281,84 @@ int np_net_ssl_read(void *buf, int num){
         return SSL_read(s, buf, num);
 }
 
+int np_net_ssl_check_cert(int days_till_exp){
+#  ifdef USE_OPENSSL
+        X509 *certificate=NULL;
+        ASN1_STRING *tm;
+        int offset;
+        struct tm stamp;
+        int days_left;
+        char timestamp[17] = "";
+
+        certificate=SSL_get_peer_certificate(s);
+        if(! certificate){
+                printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
+                return STATE_CRITICAL;
+        }
+
+        /* Retrieve timestamp of certificate */
+        tm = X509_get_notAfter (certificate);
+
+        /* Generate tm structure to process timestamp */
+        if (tm->type == V_ASN1_UTCTIME) {
+                if (tm->length < 10) {
+                        printf (_("CRITICAL - Wrong time format in certificate.\n"));
+                        return STATE_CRITICAL;
+                } else {
+                        stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
+                        if (stamp.tm_year < 50)
+                                stamp.tm_year += 100;
+                        offset = 0;
+                }
+        } else {
+                if (tm->length < 12) {
+                        printf (_("CRITICAL - Wrong time format in certificate.\n"));
+                        return STATE_CRITICAL;
+                } else {
+                        stamp.tm_year =
+                                (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
+                                (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
+                        stamp.tm_year -= 1900;
+                        offset = 2;
+                }
+        }
+        stamp.tm_mon =
+                (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
+        stamp.tm_mday =
+                (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
+        stamp.tm_hour =
+                (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
+        stamp.tm_min =
+                (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
+        stamp.tm_sec = 0;
+        stamp.tm_isdst = -1;
+
+        days_left = (mktime (&stamp) - time (NULL)) / 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;
+        } else if (days_left == 0) {
+                printf (_("WARNING - Certificate expires today (%s).\n"), timestamp);
+                return STATE_WARNING;
+        }
+
+        printf (_("OK - Certificate will expire on %s.\n"), timestamp);
+        X509_free (certificate);
+        return STATE_OK;
+#  else /* ifndef USE_OPENSSL */
+        printf (_("WARNING - Plugin does not support checking certificates.\n"));
+        return STATE_WARNING;
+#  endif /* USE_OPENSSL */
+}
+
 #endif /* HAVE_SSL */
 
 int