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-rw-r--r--plugins/sslutils.c162
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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****************************************************************************/
33
34#include "common.h"
35#include "netutils.h"
36
37#ifdef HAVE_SSL
38static SSL_CTX *c=NULL;
39static SSL *s=NULL;
40
41int np_net_ssl_init (int sd){
42 SSL_METHOD *m=NULL;
43 /* Initialize SSL context */
44 SSLeay_add_ssl_algorithms ();
45 m = SSLv23_client_method ();
46 SSL_load_error_strings ();
47 OpenSSL_add_all_algorithms();
48 if ((c = SSL_CTX_new (m)) == NULL) {
49 printf (_("CRITICAL - Cannot create SSL context.\n"));
50 return STATE_CRITICAL;
51 }
52 if ((s = SSL_new (c)) != NULL){
53 SSL_set_fd (s, sd);
54 if (SSL_connect(s) == 1){
55 return OK;
56 } else {
57 printf (_("CRITICAL - Cannot make SSL connection "));
58# ifdef USE_OPENSSL /* XXX look into ERR_error_string */
59 ERR_print_errors_fp (stdout);
60# endif /* USE_OPENSSL */
61 }
62 } else {
63 printf (_("CRITICAL - Cannot initiate SSL handshake.\n"));
64 }
65 return STATE_CRITICAL;
66}
67
68void np_net_ssl_cleanup (){
69 if(s){
70 SSL_shutdown (s);
71 SSL_free (s);
72 if(c) SSL_CTX_free (c);
73 }
74}
75
76int np_net_ssl_write(const void *buf, int num){
77 return SSL_write(s, buf, num);
78}
79
80int np_net_ssl_read(void *buf, int num){
81 return SSL_read(s, buf, num);
82}
83
84int np_net_ssl_check_cert(int days_till_exp){
85# ifdef USE_OPENSSL
86 X509 *certificate=NULL;
87 ASN1_STRING *tm;
88 int offset;
89 struct tm stamp;
90 int days_left;
91 char timestamp[17] = "";
92
93 certificate=SSL_get_peer_certificate(s);
94 if(! certificate){
95 printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
96 return STATE_CRITICAL;
97 }
98
99 /* Retrieve timestamp of certificate */
100 tm = X509_get_notAfter (certificate);
101
102 /* Generate tm structure to process timestamp */
103 if (tm->type == V_ASN1_UTCTIME) {
104 if (tm->length < 10) {
105 printf (_("CRITICAL - Wrong time format in certificate.\n"));
106 return STATE_CRITICAL;
107 } else {
108 stamp.tm_year = (tm->data[0] - '0') * 10 + (tm->data[1] - '0');
109 if (stamp.tm_year < 50)
110 stamp.tm_year += 100;
111 offset = 0;
112 }
113 } else {
114 if (tm->length < 12) {
115 printf (_("CRITICAL - Wrong time format in certificate.\n"));
116 return STATE_CRITICAL;
117 } else {
118 stamp.tm_year =
119 (tm->data[0] - '0') * 1000 + (tm->data[1] - '0') * 100 +
120 (tm->data[2] - '0') * 10 + (tm->data[3] - '0');
121 stamp.tm_year -= 1900;
122 offset = 2;
123 }
124 }
125 stamp.tm_mon =
126 (tm->data[2 + offset] - '0') * 10 + (tm->data[3 + offset] - '0') - 1;
127 stamp.tm_mday =
128 (tm->data[4 + offset] - '0') * 10 + (tm->data[5 + offset] - '0');
129 stamp.tm_hour =
130 (tm->data[6 + offset] - '0') * 10 + (tm->data[7 + offset] - '0');
131 stamp.tm_min =
132 (tm->data[8 + offset] - '0') * 10 + (tm->data[9 + offset] - '0');
133 stamp.tm_sec = 0;
134 stamp.tm_isdst = -1;
135
136 days_left = (mktime (&stamp) - time (NULL)) / 86400;
137 snprintf
138 (timestamp, 17, "%02d/%02d/%04d %02d:%02d",
139 stamp.tm_mon + 1,
140 stamp.tm_mday, stamp.tm_year + 1900, stamp.tm_hour, stamp.tm_min);
141
142 if (days_left > 0 && days_left <= days_till_exp) {
143 printf (_("WARNING - Certificate expires in %d day(s) (%s).\n"), days_left, timestamp);
144 return STATE_WARNING;
145 } else if (days_left < 0) {
146 printf (_("CRITICAL - Certificate expired on %s.\n"), timestamp);
147 return STATE_CRITICAL;
148 } else if (days_left == 0) {
149 printf (_("WARNING - Certificate expires today (%s).\n"), timestamp);
150 return STATE_WARNING;
151 }
152
153 printf (_("OK - Certificate will expire on %s.\n"), timestamp);
154 X509_free (certificate);
155 return STATE_OK;
156# else /* ifndef USE_OPENSSL */
157 printf (_("WARNING - Plugin does not support checking certificates.\n"));
158 return STATE_WARNING;
159# endif /* USE_OPENSSL */
160}
161
162#endif /* HAVE_SSL */