diff options
Diffstat (limited to 'plugins')
| -rw-r--r-- | plugins/Makefile.am | 2 | ||||
| -rw-r--r-- | plugins/check_smtp.c | 285 |
2 files changed, 273 insertions, 14 deletions
diff --git a/plugins/Makefile.am b/plugins/Makefile.am index 538f9057..51858215 100644 --- a/plugins/Makefile.am +++ b/plugins/Makefile.am @@ -69,7 +69,7 @@ check_procs_LDADD = $(BASEOBJS) popen.o check_radius_LDADD = $(NETLIBS) $(RADIUSLIBS) check_real_LDADD = $(NETLIBS) check_snmp_LDADD = $(BASEOBJS) popen.o -check_smtp_LDADD = $(NETLIBS) +check_smtp_LDADD = $(NETLIBS) $(SSLLIBS) check_ssh_LDADD = $(NETLIBS) check_swap_LDADD = $(BASEOBJS) popen.o check_tcp_LDADD = $(NETLIBS) $(SSLLIBS) diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c index 55cf5da5..6e5d972a 100644 --- a/plugins/check_smtp.c +++ b/plugins/check_smtp.c @@ -27,17 +27,49 @@ const char *email = "nagiosplug-devel@lists.sourceforge.net"; #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); +int check_certificate (X509 **); +#endif + enum { SMTP_PORT = 25 }; const char *SMTP_EXPECT = "220"; const char *SMTP_HELO = "HELO "; const char *SMTP_QUIT = "QUIT\r\n"; +const char *SMTP_STARTTLS = "STARTTLS\r\n"; 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> @@ -68,18 +100,23 @@ int check_warning_time = FALSE; int critical_time = 0; int check_critical_time = FALSE; int verbose = 0; - - +int use_ssl = FALSE; +int sd; +char buffer[MAX_INPUT_BUFFER]; +enum { + TCP_PROTOCOL = 1, + UDP_PROTOCOL = 2, + MAXBUF = 1024 +}; int main (int argc, char **argv) { - int sd; + 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; @@ -140,12 +177,45 @@ main (int argc, char **argv) result = 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")); + return STATE_UNKNOWN; + } + if(connect_STARTTLS() != OK) { + printf (_("ERROR: Cannot create SSL context.\n")); + return STATE_CRITICAL; + } + if ( check_cert ) { + if ((server_cert = SSL_get_peer_certificate (ssl)) != NULL) { + result = check_certificate (&server_cert); + X509_free(server_cert); + } + else { + printf (_("ERROR: Cannot retrieve server certificate.\n")); + result = STATE_CRITICAL; + + } + my_close(); + return result; + } + } +#endif /* send the HELO command */ +#ifdef HAVE_SSL + if (use_ssl) + SSL_write(ssl, helocmd, strlen(helocmd)); + else +#endif send(sd, helocmd, strlen(helocmd), 0); /* allow for response to helo command to reach us */ - recv(sd, buffer, MAX_INPUT_BUFFER-1, 0); + myrecv(); /* sendmail will syslog a "NOQUEUE" error if session does not attempt * to do something useful. This can be prevented by giving a command @@ -158,16 +228,26 @@ main (int argc, char **argv) * 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); @@ -206,6 +286,11 @@ main (int argc, char **argv) } /* 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 */ @@ -261,6 +346,8 @@ process_arguments (int argc, char **argv) {"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} }; @@ -277,7 +364,7 @@ process_arguments (int argc, char **argv) } 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:", longopts, &option); if (c == -1 || c == EOF) @@ -354,6 +441,22 @@ process_arguments (int argc, char **argv) usage4 (_("Timeout interval must be a positive integer")); } break; + case 'S': + /* starttls */ + use_ssl = TRUE; + break; + case 'D': + /* Check SSL cert validity */ +#ifdef HAVE_SSL + if (!is_intnonneg (optarg)) + usage2 ("Invalid certificate expiration period",optarg); + days_till_exp = atoi (optarg); + check_cert = TRUE; +#else + terminate (STATE_UNKNOWN, + "SSL support not available. Install OpenSSL and recompile."); +#endif + break; case '4': address_family = AF_INET; break; @@ -443,6 +546,13 @@ print_help (void) -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)); @@ -466,5 +576,154 @@ print_usage (void) { 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); + [-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 = SSLv2_client_method (); + SSL_load_error_strings (); + if ((ctx = SSL_CTX_new (meth)) == NULL) + { + printf(_("ERROR: 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; + ERR_print_errors_fp (stderr); + } + else + { + printf (_("ERROR: Cannot initiate SSL handshake.\n")); + } + /* this causes a seg faul + not sure why, being sloppy + and commenting it out */ + // SSL_free (ssl); + SSL_CTX_free(ctx); + my_close(); + + return STATE_CRITICAL; +} + +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 (_("ERROR: 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 (_("ERROR: 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, 16, "%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 + +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_shutdown (ssl); + SSL_free (ssl); + SSL_CTX_free (ctx); + return 0; + } + else { +#endif + return close(sd); +#ifdef HAVE_SSL + } +#endif } |