- compartmentalized ssl code into seperate sslutils.c

- ssl-related cleanups in configure.in, and now openssl/gnutls options
  automatically disable each other.


git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1258 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 162 insertions, 0 deletions

diff --git a/plugins/sslutils.c b/plugins/sslutils.c
new file mode 100644
index 00000000..d785fb75
--- /dev/null
+++ b/plugins/sslutils.c
@@ -0,0 +1,162 @@
+/****************************************************************************
+*
+* Nagios plugins SSL utilities
+*
+* License: GPL
+* Copyright (c) 2005 nagios-plugins team
+*
+* Last Modified: $Date$
+*
+* 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.
+*
+* $Id$
+*
+****************************************************************************/
+
+#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 (_("CRITICAL - Cannot create SSL context.\n"));
+                                return STATE_CRITICAL;
+                }
+                if ((s = SSL_new (c)) != NULL){
+                                SSL_set_fd (s, sd);
+                                if (SSL_connect(s) == 1){
+                                                return OK;
+                                } else {
+                                                printf (_("CRITICAL - Cannot make SSL connection "));
+#  ifdef USE_OPENSSL /* XXX look into ERR_error_string */
+                                                ERR_print_errors_fp (stdout);
+#  endif /* USE_OPENSSL */
+                                }
+                } else {
+                                printf (_("CRITICAL - Cannot initiate SSL handshake.\n"));
+                }
+                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 (_("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 */