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sslutils.c

/****************************************************************************
*
* Nagios plugins SSL utilities
*
* License: GPL
* Copyright (c) 2005 nagios-plugins team
*
* Last Modified: $Date: 2006/06/18 19:36:48 $
*
* Description:
*
* This file contains common functions for plugins that require SSL.
*
* License Information:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: sslutils.c,v 1.3 2006/06/18 19:36:48 opensides Exp $
*
****************************************************************************/

#define LOCAL_TIMEOUT_ALARM_HANDLER
#include "common.h"
#include "netutils.h"

#ifdef HAVE_SSL
static SSL_CTX *c=NULL;
static SSL *s=NULL;

int np_net_ssl_init (int sd){
            SSL_METHOD *m=NULL;
            /* Initialize SSL context */
            SSLeay_add_ssl_algorithms ();
            m = SSLv23_client_method ();
            SSL_load_error_strings ();
            OpenSSL_add_all_algorithms();
            if ((c = SSL_CTX_new (m)) == NULL) {
                        printf ("%s\n", _("CRITICAL - Cannot create SSL context."));
                        return STATE_CRITICAL;
            }
            if ((s = SSL_new (c)) != NULL){
                        SSL_set_fd (s, sd);
                        if (SSL_connect(s) == 1){
                                    return OK;
                        } else {
                                    printf ("%s\n", _("CRITICAL - Cannot make SSL connection "));
#  ifdef USE_OPENSSL /* XXX look into ERR_error_string */
                                    ERR_print_errors_fp (stdout);
#  endif /* USE_OPENSSL */
                        }
            } else {
                        printf ("%s\n", _("CRITICAL - Cannot initiate SSL handshake."));
            }
            return STATE_CRITICAL;
}

void np_net_ssl_cleanup (){
            if(s){
                        SSL_shutdown (s);
                        SSL_free (s);
                        if(c) SSL_CTX_free (c);
            }
}

int np_net_ssl_write(const void *buf, int num){
      return SSL_write(s, buf, num);
}

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 ("%s\n",_("CRITICAL - Cannot retrieve server certificate."));
            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 ("%s\n", _("CRITICAL - Wrong time format in certificate."));
                  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 ("%s\n", _("CRITICAL - Wrong time format in certificate."));
                  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 ("%s\n", _("WARNING - Plugin does not support checking certificates."));
      return STATE_WARNING;
#  endif /* USE_OPENSSL */
}

#endif /* HAVE_SSL */

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