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diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index 696af65600628e027ad49bf1ea0857b965ae37e0..19e9aea881467733e55726a650baa7afae49b9b4 100644 (file)
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
const char *progname = "check_smtp";
const char *revision = "$Revision$";
-const char *copyright = "2000-2003";
+const char *copyright = "2000-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
#include "common.h"
#include "netutils.h"
#include "utils.h"
+#ifdef HAVE_SSL_H
+# include <rsa.h>
+# include <crypto.h>
+# include <x509.h>
+# include <pem.h>
+# include <ssl.h>
+# include <err.h>
+#else
+# ifdef HAVE_OPENSSL_SSL_H
+# include <openssl/rsa.h>
+# include <openssl/crypto.h>
+# include <openssl/x509.h>
+# include <openssl/pem.h>
+# include <openssl/ssl.h>
+# include <openssl/err.h>
+# endif
+#endif
+
+#ifdef HAVE_SSL
+
+int check_cert = FALSE;
+int days_till_exp;
+SSL_CTX *ctx;
+SSL *ssl;
+X509 *server_cert;
+int connect_STARTTLS (void);
+# ifdef USE_OPENSSL
+int check_certificate (X509 **);
+# endif
+#endif
+
enum {
SMTP_PORT = 25
};
-const char *SMTP_EXPECT = "220";
-const char *SMTP_HELO = "HELO ";
-const char *SMTP_QUIT = "QUIT\r\n";
+#define SMTP_EXPECT "220"
+#define SMTP_HELO "HELO "
+#define SMTP_EHLO "EHLO "
+#define SMTP_QUIT "QUIT\r\n"
+#define SMTP_STARTTLS "STARTTLS\r\n"
+
+#ifndef HOST_MAX_BYTES
+#define HOST_MAX_BYTES 255
+#endif
+
+#define EHLO_SUPPORTS_STARTTLS 1
int process_arguments (int, char **);
int validate_arguments (void);
void print_help (void);
void print_usage (void);
+int myrecv(void);
+int my_close(void);
#ifdef HAVE_REGEX_H
#include <regex.h>
char regex_expect[MAX_INPUT_BUFFER] = "";
regex_t preg;
regmatch_t pmatch[10];
-char timestamp[10] = "";
+char timestamp[20] = "";
char errbuf[MAX_INPUT_BUFFER];
int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
int eflags = 0;
int critical_time = 0;
int check_critical_time = FALSE;
int verbose = 0;
-
-
+int use_ssl = FALSE;
+short use_ehlo = FALSE;
+short ssl_established = TRUE;
+char *localhostname = NULL;
+int sd;
+char buffer[MAX_INPUT_BUFFER];
+enum {
+ TCP_PROTOCOL = 1,
+ UDP_PROTOCOL = 2,
+ MAXBUF = 1024
+};
int
main (int argc, char **argv)
{
- int sd;
+ short supports_tls=FALSE;
int n = 0;
double elapsed_time;
long microsec;
int result = STATE_UNKNOWN;
- char buffer[MAX_INPUT_BUFFER];
char *cmd_str = NULL;
char *helocmd = NULL;
struct timeval tv;
+ struct hostent *hp;
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
- if (process_arguments (argc, argv) != OK)
- usage (_("check_smtp: could not parse arguments\n"));
+ if (process_arguments (argc, argv) == ERROR)
+ usage4 (_("Could not parse arguments"));
/* initialize the HELO command with the localhostname */
-#ifndef HOST_MAX_BYTES
-#define HOST_MAX_BYTES 255
-#endif
- helocmd = malloc (HOST_MAX_BYTES);
- gethostname(helocmd, HOST_MAX_BYTES);
- asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
+ if(! localhostname){
+ localhostname = malloc (HOST_MAX_BYTES);
+ if(!localhostname){
+ printf(_("malloc() failed!\n"));
+ return STATE_CRITICAL;
+ }
+ if(gethostname(localhostname, HOST_MAX_BYTES)){
+ printf(_("gethostname() failed!\n"));
+ return STATE_CRITICAL;
+ }
+ hp = gethostbyname(localhostname);
+ if(!hp) helocmd = localhostname;
+ else helocmd = hp->h_name;
+ } else {
+ helocmd = localhostname;
+ }
+ if(use_ehlo)
+ asprintf (&helocmd, "%s%s%s", SMTP_EHLO, helocmd, "\r\n");
+ else
+ asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n");
/* initialize the MAIL command with optional FROM command */
asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n");
}
}
- /* send the HELO command */
+ /* send the HELO/EHLO command */
send(sd, helocmd, strlen(helocmd), 0);
/* allow for response to helo command to reach us */
- recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
+ if(read (sd, buffer, MAXBUF - 1) < 0){
+ printf (_("recv() failed\n"));
+ return STATE_WARNING;
+ } else if(use_ehlo){
+ buffer[MAXBUF-1]='\0';
+ if(strstr(buffer, "250 STARTTLS") != NULL ||
+ strstr(buffer, "250-STARTTLS") != NULL){
+ supports_tls=TRUE;
+ }
+ }
+
+ if(use_ssl && ! supports_tls){
+ printf(_("WARNING - TLS not supported by server\n"));
+ send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
+ return STATE_WARNING;
+ }
+
+#ifdef HAVE_SSL
+ if(use_ssl) {
+ /* send the STARTTLS command */
+ send(sd, SMTP_STARTTLS, strlen(SMTP_STARTTLS), 0);
+
+ recv(sd,buffer, MAX_INPUT_BUFFER-1, 0); /* wait for it */
+ if (!strstr (buffer, server_expect)) {
+ printf (_("Server does not support STARTTLS\n"));
+ send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
+ return STATE_UNKNOWN;
+ }
+ if(connect_STARTTLS() != OK) {
+ printf (_("CRITICAL - Cannot create SSL context.\n"));
+ return STATE_CRITICAL;
+ } else {
+ ssl_established = TRUE;
+ }
+# ifdef USE_OPENSSL
+ if ( check_cert ) {
+ if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) {
+ result = check_certificate (&server_cert);
+ X509_free(server_cert);
+ }
+ else {
+ printf (_("CRITICAL - Cannot retrieve server certificate.\n"));
+ result = STATE_CRITICAL;
+
+ }
+ my_close();
+ return result;
+ }
+# endif /* USE_OPENSSL */
+ }
+#endif
/* sendmail will syslog a "NOQUEUE" error if session does not attempt
* to do something useful. This can be prevented by giving a command
* Use the -f option to provide a FROM address
*/
if (smtp_use_dummycmd) {
- send(sd, cmd_str, strlen(cmd_str), 0);
- recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
- if (verbose)
- printf("%s", buffer);
+#ifdef HAVE_SSL
+ if (use_ssl)
+ SSL_write(ssl, cmd_str, strlen(cmd_str));
+ else
+#endif
+ send(sd, cmd_str, strlen(cmd_str), 0);
+ myrecv();
+ if (verbose)
+ printf("%s", buffer);
}
while (n < ncommands) {
asprintf (&cmd_str, "%s%s", commands[n], "\r\n");
+#ifdef HAVE_SSL
+ if (use_ssl)
+ SSL_write(ssl,cmd_str, strlen(cmd_str));
+ else
+#endif
send(sd, cmd_str, strlen(cmd_str), 0);
- recv(sd, buffer, MAX_INPUT_BUFFER-1, 0);
+ myrecv();
if (verbose)
printf("%s", buffer);
strip (buffer);
if (n < nresponses) {
#ifdef HAVE_REGEX_H
cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
- //strncpy (regex_expect, responses[n], sizeof (regex_expect) - 1);
- //regex_expect[sizeof (regex_expect) - 1] = '\0';
errcode = regcomp (&preg, responses[n], cflags);
if (errcode != 0) {
regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER);
}
/* tell the server we're done */
+#ifdef HAVE_SSL
+ if (use_ssl)
+ SSL_write(ssl,SMTP_QUIT, strlen (SMTP_QUIT));
+ else
+#endif
send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0);
/* finally close the connection */
microsec = deltime (tv);
elapsed_time = (double)microsec / 1.0e6;
- if (result == STATE_OK)
+ if (result == STATE_OK) {
if (check_critical_time && elapsed_time > (double) critical_time)
result = STATE_CRITICAL;
else if (check_warning_time && elapsed_time > (double) warning_time)
result = STATE_WARNING;
+ }
printf (_("SMTP %s - %.3f sec. response time%s%s|%s\n"),
state_text (result), elapsed_time,
{"timeout", required_argument, 0, 't'},
{"port", required_argument, 0, 'p'},
{"from", required_argument, 0, 'f'},
+ {"fqdn", required_argument, 0, 'F'},
{"command", required_argument, 0, 'C'},
{"response", required_argument, 0, 'R'},
{"nocommand", required_argument, 0, 'n'},
{"use-ipv4", no_argument, 0, '4'},
{"use-ipv6", no_argument, 0, '6'},
{"help", no_argument, 0, 'h'},
+ {"starttls",no_argument,0,'S'},
+ {"certificate",required_argument,0,'D'},
{0, 0, 0, 0}
};
}
while (1) {
- c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:",
+ c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:SD:F:",
longopts, &option);
if (c == -1 || c == EOF)
if (is_intpos (optarg))
server_port = atoi (optarg);
else
- usage (_("Port must be a positive integer\n"));
+ usage4 (_("Port must be a positive integer"));
+ break;
+ case 'F':
+ /* localhostname */
+ localhostname = strdup(optarg);
break;
case 'f': /* from argument */
from_arg = optarg;
check_critical_time = TRUE;
}
else {
- usage (_("Critical time must be a positive integer\n"));
+ usage4 (_("Critical time must be a positive integer"));
}
break;
case 'w': /* warning time threshold */
check_warning_time = TRUE;
}
else {
- usage (_("Warning time must be a positive integer\n"));
+ usage4 (_("Warning time must be a positive integer"));
}
break;
case 'v': /* verbose */
socket_timeout = atoi (optarg);
}
else {
- usage (_("Time interval must be a positive integer\n"));
+ usage4 (_("Timeout interval must be a positive integer"));
}
break;
+ case 'S':
+ /* starttls */
+ use_ssl = TRUE;
+ use_ehlo = TRUE;
+ break;
+ case 'D':
+ /* Check SSL cert validity */
+#ifdef USE_OPENSSL
+ if (!is_intnonneg (optarg))
+ usage2 ("Invalid certificate expiration period",optarg);
+ days_till_exp = atoi (optarg);
+ check_cert = TRUE;
+#else
+ usage (_("SSL support not available - install OpenSSL and recompile"));
+#endif
+ break;
case '4':
address_family = AF_INET;
break;
#ifdef USE_IPV6
address_family = AF_INET6;
#else
- usage (_("IPv6 support not available\n"));
+ usage4 (_("IPv6 support not available"));
#endif
break;
case 'V': /* version */
print_help ();
exit (STATE_OK);
case '?': /* help */
- printf (_("%s: Unknown argument: %s\n\n"), progname, optarg);
- print_usage ();
- exit (STATE_UNKNOWN);
+ usage2 (_("Unknown argument"), optarg);
}
}
printf ("Copyright (c) 1999-2001 Ethan Galstad <nagios@nagios.org>\n");
printf (COPYRIGHT, copyright, email);
- printf(_("\
-This plugin will attempt to open an SMTP connection with the host.\n\n"));
+ printf(_("This plugin will attempt to open an SMTP connection with the host.\n\n"));
print_usage ();
-f, --from=STRING\n\
FROM-address to include in MAIL command, required by Exchange 2000\n"),
SMTP_EXPECT);
+#ifdef HAVE_SSL
+ printf (_("\
+ -D, --certificate=INTEGER\n\
+ Minimum number of days a certificate has to be valid.\n\
+ -S, --starttls\n\
+ Use STARTTLS for the connection.\n"));
+#endif
printf (_(UT_WARN_CRIT));
{
printf ("\
Usage: %s -H host [-p port] [-e expect] [-C command] [-f from addr]\n\
- [-w warn] [-c crit] [-t timeout] [-n] [-v] [-4|-6]\n", progname);
- printf (_(UT_HLP_VRS), progname, progname);
+ [-w warn] [-c crit] [-t timeout] [-S] [-D days] [-n] [-v] [-4|-6]\n", progname);
+}
+
+#ifdef HAVE_SSL
+int
+connect_STARTTLS (void)
+{
+ SSL_METHOD *meth;
+
+ /* Initialize SSL context */
+ SSLeay_add_ssl_algorithms ();
+ meth = SSLv23_client_method ();
+ SSL_load_error_strings ();
+ if ((ctx = SSL_CTX_new (meth)) == NULL)
+ {
+ printf(_("CRITICAL - Cannot create SSL context.\n"));
+ return STATE_CRITICAL;
+ }
+ /* do the SSL handshake */
+ if ((ssl = SSL_new (ctx)) != NULL)
+ {
+ SSL_set_fd (ssl, sd);
+ /* original version checked for -1
+ I look for success instead (1) */
+ if (SSL_connect (ssl) == 1)
+ return OK;
+# ifdef USE_OPENSSL
+ ERR_print_errors_fp (stderr);
+# endif
+ }
+ else
+ {
+ printf (_("CRITICAL - Cannot initiate SSL handshake.\n"));
+ }
+ my_close();
+
+ return STATE_CRITICAL;
+}
+
+# ifdef USE_OPENSSL
+int
+check_certificate (X509 ** certificate)
+{
+ ASN1_STRING *tm;
+ int offset;
+ struct tm stamp;
+ int days_left;
+
+ /* 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, sizeof(timestamp), "%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 ("Certificate expires in %d day(s) (%s).\n", days_left, timestamp);
+ return STATE_WARNING;
+ }
+ if (days_left < 0) {
+ printf ("Certificate expired on %s.\n", timestamp);
+ return STATE_CRITICAL;
+ }
+
+ if (days_left == 0) {
+ printf ("Certificate expires today (%s).\n", timestamp);
+ return STATE_WARNING;
+ }
+
+ printf ("Certificate will expire on %s.\n", timestamp);
+
+ return STATE_OK;
+}
+# endif /* USE_OPENSSL */
+#endif
+
+int
+myrecv (void)
+{
+ int i;
+
+#ifdef HAVE_SSL
+ if (use_ssl) {
+ i = SSL_read (ssl, buffer, MAXBUF - 1);
+ }
+ else {
+#endif
+ i = read (sd, buffer, MAXBUF - 1);
+#ifdef HAVE_SSL
+ }
+#endif
+ return i;
+}
+
+int
+my_close (void)
+{
+#ifdef HAVE_SSL
+ if (use_ssl == TRUE && ssl_established == TRUE) {
+ SSL_shutdown (ssl);
+ SSL_free (ssl);
+ SSL_CTX_free (ctx);
+ return 0;
+ }
+ else {
+#endif
+ return close(sd);
+#ifdef HAVE_SSL
+ }
+#endif
}