1 /****************************************************************************
2 *
3 * Nagios plugins SSL utilities
4 *
5 * License: GPL
6 * Copyright (c) 2005 nagios-plugins team
7 *
8 * Last Modified: $Date$
9 *
10 * Description:
11 *
12 * This file contains common functions for plugins that require SSL.
13 *
14 * License Information:
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 *
30 * $Id$
31 *
32 ****************************************************************************/
34 #define LOCAL_TIMEOUT_ALARM_HANDLER
35 #include "common.h"
36 #include "netutils.h"
38 #ifdef HAVE_SSL
39 static SSL_CTX *c=NULL;
40 static SSL *s=NULL;
42 int np_net_ssl_init (int sd){
43 SSL_METHOD *m=NULL;
44 /* Initialize SSL context */
45 SSLeay_add_ssl_algorithms ();
46 m = SSLv23_client_method ();
47 SSL_load_error_strings ();
48 OpenSSL_add_all_algorithms();
49 if ((c = SSL_CTX_new (m)) == NULL) {
50 printf ("%s\n", _("CRITICAL - Cannot create SSL context."));
51 return STATE_CRITICAL;
52 }
53 if ((s = SSL_new (c)) != NULL){
54 SSL_set_fd (s, sd);
55 if (SSL_connect(s) == 1){
56 return OK;
57 } else {
58 printf ("%s\n", _("CRITICAL - Cannot make SSL connection "));
59 # ifdef USE_OPENSSL /* XXX look into ERR_error_string */
60 ERR_print_errors_fp (stdout);
61 # endif /* USE_OPENSSL */
62 }
63 } else {
64 printf ("%s\n", _("CRITICAL - Cannot initiate SSL handshake."));
65 }
66 return STATE_CRITICAL;
67 }
69 void np_net_ssl_cleanup (){
70 if(s){
71 SSL_shutdown (s);
72 SSL_free (s);
73 if(c) SSL_CTX_free (c);
74 }
75 }
77 int np_net_ssl_write(const void *buf, int num){
78 return SSL_write(s, buf, num);
79 }
81 int np_net_ssl_read(void *buf, int num){
82 return SSL_read(s, buf, num);
83 }
85 int np_net_ssl_check_cert(int days_till_exp){
86 # ifdef USE_OPENSSL
87 X509 *certificate=NULL;
88 ASN1_STRING *tm;
89 int offset;
90 struct tm stamp;
91 int days_left;
92 char timestamp[17] = "";
94 certificate=SSL_get_peer_certificate(s);
95 if(! certificate){
96 printf ("%s\n",_("CRITICAL - Cannot retrieve server certificate."));
97 return STATE_CRITICAL;
98 }
100 /* Retrieve timestamp of certificate */
101 tm = X509_get_notAfter (certificate);
103 /* Generate tm structure to process timestamp */
104 if (tm->type == V_ASN1_UTCTIME) {
105 if (tm->length < 10) {
106 printf ("%s\n", _("CRITICAL - Wrong time format in certificate."));
107 return STATE_CRITICAL;
108 } else {
109 stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
110 if (stamp.tm_year < 50)
111 stamp.tm_year += 100;
112 offset = 0;
113 }
114 } else {
115 if (tm->length < 12) {
116 printf ("%s\n", _("CRITICAL - Wrong time format in certificate."));
117 return STATE_CRITICAL;
118 } else {
119 stamp.tm_year =
120 (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
121 (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
122 stamp.tm_year -= 1900;
123 offset = 2;
124 }
125 }
126 stamp.tm_mon =
127 (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
128 stamp.tm_mday =
129 (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
130 stamp.tm_hour =
131 (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
132 stamp.tm_min =
133 (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
134 stamp.tm_sec = 0;
135 stamp.tm_isdst = -1;
137 days_left = (mktime (&stamp) - time (NULL)) / 86400;
138 snprintf
139 (timestamp, 17, "%02d/%02d/%04d %02d:%02d",
140 stamp.tm_mon + 1,
141 stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
143 if (days_left > 0 && days_left <= days_till_exp) {
144 printf (_("WARNING - Certificate expires in %d day(s) (%s).\n"), days_left, timestamp);
145 return STATE_WARNING;
146 } else if (days_left < 0) {
147 printf (_("CRITICAL - Certificate expired on %s.\n"), timestamp);
148 return STATE_CRITICAL;
149 } else if (days_left == 0) {
150 printf (_("WARNING - Certificate expires today (%s).\n"), timestamp);
151 return STATE_WARNING;
152 }
154 printf (_("OK - Certificate will expire on %s.\n"), timestamp);
155 X509_free (certificate);
156 return STATE_OK;
157 # else /* ifndef USE_OPENSSL */
158 printf ("%s\n", _("WARNING - Plugin does not support checking certificates."));
159 return STATE_WARNING;
160 # endif /* USE_OPENSSL */
161 }
163 #endif /* HAVE_SSL */