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+/****************************************************************************
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+*
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+* Nagios plugins SSL utilities
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+*
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+* License: GPL
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+* Copyright (c) 2005 nagios-plugins team
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+*
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+* Last Modified: $Date$
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+*
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+* Description:
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+*
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+* This file contains common functions for plugins that require SSL.
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+*
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+* License Information:
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+*
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+* This program is free software; you can redistribute it and/or modify
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+* it under the terms of the GNU General Public License as published by
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+* the Free Software Foundation; either version 2 of the License, or
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+* (at your option) any later version.
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+*
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+* This program is distributed in the hope that it will be useful,
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+* but WITHOUT ANY WARRANTY; without even the implied warranty of
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+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+* GNU General Public License for more details.
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+*
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+* You should have received a copy of the GNU General Public License
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+* along with this program; if not, write to the Free Software
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+* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+*
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+* $Id$
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+*
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+****************************************************************************/
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+
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+#include "common.h"
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+#include "netutils.h"
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+
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+#ifdef HAVE_SSL
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+static SSL_CTX *c=NULL;
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+static SSL *s=NULL;
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+
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+int np_net_ssl_init (int sd){
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+ SSL_METHOD *m=NULL;
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+ /* Initialize SSL context */
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+ SSLeay_add_ssl_algorithms ();
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+ m = SSLv23_client_method ();
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+ SSL_load_error_strings ();
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+ OpenSSL_add_all_algorithms();
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+ if ((c = SSL_CTX_new (m)) == NULL) {
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+ printf (_("CRITICAL - Cannot create SSL context.\n"));
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+ return STATE_CRITICAL;
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+ }
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+ if ((s = SSL_new (c)) != NULL){
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+ SSL_set_fd (s, sd);
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+ if (SSL_connect(s) == 1){
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+ return OK;
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+ } else {
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+ printf (_("CRITICAL - Cannot make SSL connection "));
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+# ifdef USE_OPENSSL /* XXX look into ERR_error_string */
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+ ERR_print_errors_fp (stdout);
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+# endif /* USE_OPENSSL */
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+ }
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+ } else {
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+ printf (_("CRITICAL - Cannot initiate SSL handshake.\n"));
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+ }
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+ return STATE_CRITICAL;
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+}
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+
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+void np_net_ssl_cleanup (){
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+ if(s){
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+ SSL_shutdown (s);
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+ SSL_free (s);
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+ if(c) SSL_CTX_free (c);
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+ }
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+}
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+
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+int np_net_ssl_write(const void *buf, int num){
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+ return SSL_write(s, buf, num);
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+}
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+
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+int np_net_ssl_read(void *buf, int num){
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+ return SSL_read(s, buf, num);
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+}
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+
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+int np_net_ssl_check_cert(int days_till_exp){
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+# ifdef USE_OPENSSL
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+ X509 *certificate=NULL;
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+ ASN1_STRING *tm;
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+ int offset;
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+ struct tm stamp;
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+ int days_left;
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+ char timestamp[17] = "";
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+
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+ certificate=SSL_get_peer_certificate(s);
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+ if(! certificate){
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+ printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
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+ return STATE_CRITICAL;
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+ }
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+
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+ /* Retrieve timestamp of certificate */
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+ tm = X509_get_notAfter (certificate);
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+
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+ /* Generate tm structure to process timestamp */
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+ if (tm->type == V_ASN1_UTCTIME) {
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+ if (tm->length < 10) {
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+ printf (_("CRITICAL - Wrong time format in certificate.\n"));
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+ return STATE_CRITICAL;
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+ } else {
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+ stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
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+ if (stamp.tm_year < 50)
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+ stamp.tm_year += 100;
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+ offset = 0;
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+ }
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+ } else {
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+ if (tm->length < 12) {
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+ printf (_("CRITICAL - Wrong time format in certificate.\n"));
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+ return STATE_CRITICAL;
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+ } else {
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+ stamp.tm_year =
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+ (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
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+ (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
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+ stamp.tm_year -= 1900;
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+ offset = 2;
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+ }
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+ }
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+ stamp.tm_mon =
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+ (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
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+ stamp.tm_mday =
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+ (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
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+ stamp.tm_hour =
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+ (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
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+ stamp.tm_min =
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+ (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
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+ stamp.tm_sec = 0;
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+ stamp.tm_isdst = -1;
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+
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+ days_left = (mktime (&stamp) - time (NULL)) / 86400;
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+ snprintf
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+ (timestamp, 17, "%02d/%02d/%04d %02d:%02d",
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+ stamp.tm_mon + 1,
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+ stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
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+
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+ if (days_left > 0 && days_left <= days_till_exp) {
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+ printf (_("WARNING - Certificate expires in %d day(s) (%s).\n"), days_left, timestamp);
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+ return STATE_WARNING;
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+ } else if (days_left < 0) {
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+ printf (_("CRITICAL - Certificate expired on %s.\n"), timestamp);
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+ return STATE_CRITICAL;
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+ } else if (days_left == 0) {
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+ printf (_("WARNING - Certificate expires today (%s).\n"), timestamp);
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+ return STATE_WARNING;
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+ }
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+
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+ printf (_("OK - Certificate will expire on %s.\n"), timestamp);
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+ X509_free (certificate);
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+ return STATE_OK;
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+# else /* ifndef USE_OPENSSL */
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+ printf (_("WARNING - Plugin does not support checking certificates.\n"));
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+ return STATE_WARNING;
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+# endif /* USE_OPENSSL */
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+}
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+
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+#endif /* HAVE_SSL */
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M. Sean Finney