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/****************************************************************************
*
* check_nrpe.c - NRPE Plugin For Nagios
*
* License: GPLv2
* Copyright (c) 2009-2017 Nagios Enterprises
* 1999-2008 Ethan Galstad (nagios@nagios.org)
*
* Command line:
*
* check_nrpe -H <host_address> [-p port] [-c command] [-to to_sec]
*
* Description:
*
* This plugin will attempt to connect to the NRPE daemon on the specified
* server and port. The daemon will attempt to run the command
* defined as [command]. Program output and return code are sent back
* from the daemon and displayed as this plugin's own
* output and return code.
*
* License Notice:
*
* 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.
*
****************************************************************************/
#include "config.h"
#include "common.h"
#include "utils.h"
#define DEFAULT_NRPE_COMMAND "_NRPE_CHECK" /* check version of NRPE daemon */
u_short server_port = 0;
char *server_name = NULL;
char *bind_address = NULL;
char *config_file = NULL;
#ifdef HAVE_STRUCT_SOCKADDR_STORAGE
struct sockaddr_storage hostaddr;
#else
struct sockaddr hostaddr;
#endif
int address_family = AF_UNSPEC;
char *command_name = NULL;
int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
char timeout_txt[10];
int timeout_return_code = -1;
int stderr_to_stdout = 0;
int sd;
char rem_host[MAX_HOST_ADDRESS_LENGTH];
char query[MAX_INPUT_BUFFER] = "";
int show_help = FALSE;
int show_license = FALSE;
int show_version = FALSE;
int packet_ver = NRPE_DEFAULT_PACKET_VERSION;
int force_v2_packet = 0;
int force_v3_packet = 0;
int payload_size = 0;
extern char *log_file;
#ifdef HAVE_SSL
# if (defined(__sun) && defined(SOLARIS_10)) || defined(_AIX) || defined(__hpux)
SSL_METHOD *meth;
# else
const SSL_METHOD *meth;
# endif
SSL_CTX *ctx;
SSL *ssl;
int use_ssl = TRUE;
unsigned long ssl_opts = SSL_OP_ALL;
#else
int use_ssl = FALSE;
#endif
/* SSL/TLS parameters */
typedef enum _SSL_VER {
SSL_Ver_Invalid = 0, SSLv2 = 1, SSLv2_plus, SSLv3, SSLv3_plus,
TLSv1, TLSv1_plus, TLSv1_1, TLSv1_1_plus, TLSv1_2, TLSv1_2_plus, TLSv1_3, TLSv1_3_plus
} SslVer;
typedef enum _CLNT_CERTS { Ask_For_Cert = 1, Require_Cert = 2 } ClntCerts;
typedef enum _SSL_LOGGING {
SSL_NoLogging = 0, SSL_LogStartup = 1, SSL_LogIpAddr = 2,
SSL_LogVersion = 4, SSL_LogCipher = 8, SSL_LogIfClientCert = 16,
SSL_LogCertDetails = 32,
} SslLogging;
struct _SSL_PARMS {
char *cert_file;
char *cacert_file;
char *privatekey_file;
char cipher_list[MAX_FILENAME_LENGTH];
SslVer ssl_proto_ver;
int allowDH;
ClntCerts client_certs;
SslLogging log_opts;
} sslprm = {
NULL, NULL, NULL, "", SSL_Ver_Invalid, -1, 0, SSL_NoLogging};
int have_log_opts = FALSE;
int process_arguments(int, char **, int);
int read_config_file(char *);
const char *state_text (int result);
int translate_state (char *state_text);
void set_timeout_state (char *state);
int parse_timeout_string (char *timeout_str);
void usage(int result);
void setup_ssl();
void set_sig_handlers();
int connect_to_remote();
int send_request();
int read_response();
int read_packet(int sock, void *ssl_ptr, v2_packet ** v2_pkt, v3_packet ** v3_pkt);
#ifdef HAVE_SSL
static int verify_callback(int ok, X509_STORE_CTX * ctx);
#endif
void alarm_handler(int);
int graceful_close(int, int);
int disable_syslog = FALSE;
int main(int argc, char **argv)
{
int16_t result;
result = process_arguments(argc, argv, 0);
if (result != OK || show_help == TRUE || show_license == TRUE || show_version == TRUE)
usage(result); /* usage() will call exit() */
snprintf(timeout_txt, sizeof(timeout_txt), "%d", socket_timeout);
if (server_port == 0)
server_port = DEFAULT_SERVER_PORT;
if (socket_timeout == -1)
socket_timeout = DEFAULT_SOCKET_TIMEOUT;
if (timeout_return_code == -1)
timeout_return_code = STATE_CRITICAL;
if (sslprm.cipher_list[0] == '\0')
#if OPENSSL_VERSION_NUMBER >= 0x10100000
strncpy(sslprm.cipher_list, "ALL:!MD5:@STRENGTH:@SECLEVEL=0", MAX_FILENAME_LENGTH - 1);
#else
strncpy(sslprm.cipher_list, "ALL:!MD5:@STRENGTH", MAX_FILENAME_LENGTH - 1);
#endif
if (sslprm.ssl_proto_ver == SSL_Ver_Invalid)
sslprm.ssl_proto_ver = TLSv1_plus;
if (sslprm.allowDH == -1)
sslprm.allowDH = TRUE;
generate_crc32_table(); /* generate the CRC 32 table */
setup_ssl(); /* Do all the SSL/TLS set up */
set_sig_handlers(); /* initialize alarm signal handling */
result = connect_to_remote(); /* Make the connection */
if (result != STATE_OK) {
alarm(0);
return result;
}
result = send_request(); /* Send the request */
if (result != STATE_OK)
return result;
result = read_response(); /* Get the response */
if (result == -1) {
/* Failure reading from remote, so try version 2 packet */
logit(LOG_INFO, "Remote %s does not support version 3/4 packets", rem_host);
packet_ver = NRPE_PACKET_VERSION_2;
/* Rerun the setup */
setup_ssl();
set_sig_handlers();
result = connect_to_remote(); /* Connect */
if (result != STATE_OK) {
alarm(0);
close_log_file(); /* close the log file */
return result;
}
result = send_request(); /* Send the request */
if (result != STATE_OK) {
close_log_file(); /* close the log file */
return result;
}
result = read_response(); /* Get the response */
}
if (result != -1 && force_v2_packet == 0 && packet_ver == NRPE_PACKET_VERSION_2)
logit(LOG_DEBUG, "Remote %s accepted a version %d packet", rem_host, packet_ver);
close_log_file(); /* close the log file */
return result;
}
/* process command line arguments */
int process_arguments(int argc, char **argv, int from_config_file)
{
char optchars[MAX_INPUT_BUFFER];
int argindex = 0;
int c = 1;
int i = 1;
int has_cert = 0, has_priv_key = 0, rc;
#ifdef HAVE_GETOPT_LONG
int option_index = 0;
static struct option long_options[] = {
{"host", required_argument, 0, 'H'},
{"config-file", required_argument, 0, 'f'},
{"bind", required_argument, 0, 'b'},
{"command", required_argument, 0, 'c'},
{"args", required_argument, 0, 'a'},
{"no-ssl", no_argument, 0, 'n'},
{"unknown-timeout", no_argument, 0, 'u'},
{"v2-packets-only", no_argument, 0, '2'},
{"v3-packets-only", no_argument, 0, '3'},
{"ipv4", no_argument, 0, '4'},
{"ipv6", no_argument, 0, '6'},
{"use-adh", required_argument, 0, 'd'},
{"ssl-version", required_argument, 0, 'S'},
{"cipher-list", required_argument, 0, 'L'},
{"client-cert", required_argument, 0, 'C'},
{"key-file", required_argument, 0, 'K'},
{"ca-cert-file", required_argument, 0, 'A'},
{"ssl-logging", required_argument, 0, 's'},
{"timeout", required_argument, 0, 't'},
{"port", required_argument, 0, 'p'},
{"payload-size", required_argument, 0, 'P'},
{"log-file", required_argument, 0, 'g'},
{"help", no_argument, 0, 'h'},
{"license", no_argument, 0, 'l'},
{"version", no_argument, 0, 'V'},
{"stderr-to-stdout", no_argument, 0, 'E'},
{"disable-syslog", no_argument, 0, 'D'},
{0, 0, 0, 0}
};
#endif
/* no options were supplied */
if (argc < 2)
return ERROR;
optind = 0;
snprintf(optchars, MAX_INPUT_BUFFER, "H:f:b:c:a:t:p:S:L:C:K:A:d:s:P:g:2346hlnuVED");
while (1) {
if (argindex > 0)
break;
#ifdef HAVE_GETOPT_LONG
c = getopt_long(argc, argv, optchars, long_options, &option_index);
#else
c = getopt(argc, argv, optchars);
#endif
if (c == -1 || c == EOF)
break;
/* process all arguments */
switch (c) {
case '?':
case 'h':
show_help = TRUE;
break;
case 'b':
bind_address = strdup(optarg);
break;
case 'f':
if (from_config_file) {
printf("Error: The config file should not have a config-file (-f) option.\n");
break;
}
config_file = strdup(optarg);
break;
case 'V':
show_version = TRUE;
break;
case 'l':
show_license = TRUE;
break;
case 't':
if (from_config_file && socket_timeout != -1) {
logit(LOG_WARNING, "WARNING: Command-line socket timeout overrides the config file option.");
break;
}
socket_timeout=parse_timeout_string(optarg);
if (socket_timeout <= 0)
return ERROR;
break;
case 'p':
if (from_config_file && server_port != 0) {
logit(LOG_WARNING, "WARNING: Command-line server port overrides the config file option.");
break;
}
server_port = atoi(optarg);
if (server_port <= 0)
return ERROR;
break;
case 'P':
if (from_config_file && payload_size > 0) {
logit(LOG_WARNING, "WARNING: Command-line payload-size (-P) overrides the config file option.");
break;
}
payload_size = atoi(optarg);
if (payload_size < 0)
return ERROR;
break;
case 'H':
if (from_config_file && server_name != NULL) {
logit(LOG_WARNING, "WARNING: Command-line server name overrides the config file option.");
break;
}
server_name = strdup(optarg);
break;
case 'E':
if (from_config_file && stderr_to_stdout != 0) {
logit(LOG_WARNING, "WARNING: Command-line stderr redirection overrides the config file option.");
break;
}
stderr_to_stdout = 1;
break;
case 'c':
if (from_config_file) {
printf("Error: The config file should not have a command (-c) option.\n");
return ERROR;
}
command_name = strdup(optarg);
break;
case 'a':
if (from_config_file) {
printf("Error: The config file should not have args (-a) arguments.\n");
return ERROR;
}
argindex = optind;
break;
case 'n':
use_ssl = FALSE;
break;
case 'u':
if (from_config_file && timeout_return_code != -1) {
logit(LOG_WARNING, "WARNING: Command-line unknown-timeout (-u) overrides the config file option.");
break;
}
timeout_return_code = STATE_UNKNOWN;
break;
case '2':
if (from_config_file && packet_ver != NRPE_DEFAULT_PACKET_VERSION) {
logit(LOG_WARNING, "WARNING: Command-line v2-packets-only (-2) overrides the config file option.");
break;
}
packet_ver = NRPE_PACKET_VERSION_2;
force_v2_packet = 1;
break;
case '3':
if (from_config_file && packet_ver != NRPE_DEFAULT_PACKET_VERSION) {
logit(LOG_WARNING, "Warning: Command-line v3-packets-only (-3) overrides the config file option.");
break;
}
packet_ver = NRPE_PACKET_VERSION_3;
force_v3_packet = 1;
break;
case '4':
if (from_config_file && address_family != AF_UNSPEC) {
logit(LOG_WARNING, "WARNING: Command-line ipv4 (-4) or ipv6 (-6) overrides the config file option.");
break;
}
address_family = AF_INET;
break;
case '6':
if (from_config_file && address_family != AF_UNSPEC) {
logit(LOG_WARNING, "WARNING: Command-line ipv4 (-4) or ipv6 (-6) overrides the config file option.");
break;
}
address_family = AF_INET6;
break;
case 'd':
if (from_config_file && sslprm.allowDH != -1) {
logit(LOG_WARNING, "WARNING: Command-line use-adh (-d) overrides the config file option.");
break;
}
if (!optarg || optarg[0] < '0' || optarg[0] > '2')
return ERROR;
sslprm.allowDH = atoi(optarg);
break;
case 'A':
if (from_config_file && sslprm.cacert_file != NULL) {
logit(LOG_WARNING, "WARNING: Command-line ca-cert-file (-A) overrides the config file option.");
break;
}
sslprm.cacert_file = strdup(optarg);
break;
case 'C':
if (from_config_file && sslprm.cert_file != NULL) {
logit(LOG_WARNING, "WARNING: Command-line client-cert (-C) overrides the config file option.");
break;
}
sslprm.cert_file = strdup(optarg);
has_cert = 1;
break;
case 'K':
if (from_config_file && sslprm.privatekey_file != NULL) {
logit(LOG_WARNING, "WARNING: Command-line key-file (-K) overrides the config file option.");
break;
}
sslprm.privatekey_file = strdup(optarg);
has_priv_key = 1;
break;
case 'S':
if (from_config_file && sslprm.ssl_proto_ver != SSL_Ver_Invalid) {
logit(LOG_WARNING, "WARNING: Command-line ssl-version (-S) overrides the config file option.");
break;
}
if (!strcmp(optarg, "TLSv1.3"))
sslprm.ssl_proto_ver = TLSv1_3;
else if (!strcmp(optarg, "TLSv1.3+"))
sslprm.ssl_proto_ver = TLSv1_3_plus;
else if (!strcmp(optarg, "TLSv1.2"))
sslprm.ssl_proto_ver = TLSv1_2;
else if (!strcmp(optarg, "TLSv1.2+"))
sslprm.ssl_proto_ver = TLSv1_2_plus;
else if (!strcmp(optarg, "TLSv1.1"))
sslprm.ssl_proto_ver = TLSv1_1;
else if (!strcmp(optarg, "TLSv1.1+"))
sslprm.ssl_proto_ver = TLSv1_1_plus;
else if (!strcmp(optarg, "TLSv1"))
sslprm.ssl_proto_ver = TLSv1;
else if (!strcmp(optarg, "TLSv1+"))
sslprm.ssl_proto_ver = TLSv1_plus;
else if (!strcmp(optarg, "SSLv3"))
sslprm.ssl_proto_ver = SSLv3;
else if (!strcmp(optarg, "SSLv3+"))
sslprm.ssl_proto_ver = SSLv3_plus;
#if OPENSSL_VERSION_NUMBER < 0x10100000
else if (!strcmp(optarg, "SSLv2"))
sslprm.ssl_proto_ver = SSLv2;
else if (!strcmp(optarg, "SSLv2+"))
sslprm.ssl_proto_ver = SSLv2_plus;
#endif /* OPENSSL_VERSION_NUMBER < 0x10100000 */
else
return ERROR;
break;
case 'L':
if (from_config_file && sslprm.cipher_list[0] != '\0') {
logit(LOG_WARNING, "WARNING: Command-line cipher-list (-L) overrides the config file option.");
break;
}
strncpy(sslprm.cipher_list, optarg, sizeof(sslprm.cipher_list) - 1);
sslprm.cipher_list[sizeof(sslprm.cipher_list) - 1] = '\0';
break;
case 's':
if (from_config_file && have_log_opts == TRUE) {
logit(LOG_WARNING, "WARNING: Command-line ssl-logging (-s) overrides the config file option.");
break;
}
sslprm.log_opts = strtoul(optarg, NULL, 0);
have_log_opts = TRUE;
break;
case 'g':
if (from_config_file && log_file != NULL) {
logit(LOG_WARNING, "WARNING: Command-line log-file (-g) overrides the config file option.");
break;
}
log_file = strdup(optarg);
open_log_file();
break;
case 'D':
disable_syslog = TRUE;
break;
default:
return ERROR;
}
}
/* determine (base) command query */
if (!from_config_file) {
snprintf(query, sizeof(query), "%s",
(command_name == NULL) ? DEFAULT_NRPE_COMMAND : command_name);
query[sizeof(query) - 1] = '\x0';
}
/* get the command args */
if (!from_config_file && argindex > 0) {
for (c = argindex - 1; c < argc; c++) {
i = sizeof(query) - strlen(query) - 2;
if (i <= 0)
break;
strcat(query, "!");
strncat(query, argv[c], i);
query[sizeof(query) - 1] = '\x0';
}
}
if (!from_config_file && config_file != NULL) {
if ((rc = read_config_file(config_file)) != OK)
return rc;
}
if ((has_cert && !has_priv_key) || (!has_cert && has_priv_key)) {
printf("Error: the client certificate and the private key must both be given or neither\n");
return ERROR;
}
if (payload_size > 0 && packet_ver != NRPE_PACKET_VERSION_2) {
printf("Error: if a fixed payload size is specified, '-2' must also be specified\n");
return ERROR;
}
if (force_v2_packet && force_v3_packet) {
printf("Error: Only one of force_v2_packet (-2) and force_v3_packet (-3) can be specified.\n");
return ERROR;
}
/* make sure required args were supplied */
if (server_name == NULL && show_help == FALSE && show_version == FALSE
&& show_license == FALSE)
return ERROR;
return OK;
}
int read_config_file(char *fname)
{
int rc, argc = 0;
FILE *f;
char *buf, *bufp, **argv;
char *delims = " \t\r\n";
struct stat st;
size_t sz;
if (stat(fname, &st)) {
logit(LOG_ERR, "Error: Could not stat config file %s", fname);
return ERROR;
}
if ((f = fopen(fname, "r")) == NULL) {
logit(LOG_ERR, "Error: Could not open config file %s", fname);
return ERROR;
}
if ((buf = (char*)calloc(1, st.st_size + 2)) == NULL) {
fclose(f);
logit(LOG_ERR, "Error: read_config_file fail to allocate memory");
return ERROR;
}
if ((sz = fread(buf, 1, st.st_size, f)) != st.st_size) {
fclose(f);
free(buf);
logit(LOG_ERR, "Error: Failed to completely read config file %s", fname);
return ERROR;
}
if ((argv = calloc(50, sizeof(char*))) == NULL) {
fclose(f);
free(buf);
logit(LOG_ERR, "Error: read_config_file fail to allocate memory");
return ERROR;
}
argv[argc++] = "check_nrpe";
bufp = buf;
while (argc < 50) {
while (*bufp && strchr(delims, *bufp))
++bufp;
if (*bufp == '\0')
break;
argv[argc] = my_strsep(&bufp, delims);
if (!argv[argc++])
break;
if (!bufp)
break;
}
fclose(f);
if (argc == 50) {
free(buf);
free(argv);
logit(LOG_ERR, "Error: too many parameters in config file %s", fname);
return ERROR;
}
rc = process_arguments(argc, argv, 1);
free(buf);
free(argv);
return rc;
}
const char *state_text (int result)
{
switch (result) {
case STATE_OK:
return "OK";
case STATE_WARNING:
return "WARNING";
case STATE_CRITICAL:
return "CRITICAL";
default:
return "UNKNOWN";
}
}
int translate_state (char *state_text) {
if (!strcasecmp(state_text,"OK") || !strcmp(state_text,"0"))
return STATE_OK;
if (!strcasecmp(state_text,"WARNING") || !strcmp(state_text,"1"))
return STATE_WARNING;
if (!strcasecmp(state_text,"CRITICAL") || !strcmp(state_text,"2"))
return STATE_CRITICAL;
if (!strcasecmp(state_text,"UNKNOWN") || !strcmp(state_text,"3"))
return STATE_UNKNOWN;
return ERROR;
}
void set_timeout_state (char *state) {
if ((timeout_return_code = translate_state(state)) == ERROR)
printf("Timeout state must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3).\n");
}
int parse_timeout_string (char *timeout_str)
{
char *separated_str;
char *timeout_val = NULL;
char *timeout_sta = NULL;
if (strstr(timeout_str, ":") == NULL)
timeout_val = timeout_str;
else if (strncmp(timeout_str, ":", 1) == 0) {
separated_str = strtok(timeout_str, ":");
if (separated_str != NULL)
timeout_sta = separated_str;
} else {
separated_str = strtok(timeout_str, ":");
timeout_val = separated_str;
separated_str = strtok(NULL, ":");
if (separated_str != NULL) {
timeout_sta = separated_str;
}
}
if ( timeout_sta != NULL )
set_timeout_state(timeout_sta);
if ((timeout_val == NULL) || (timeout_val[0] == '\0'))
return socket_timeout;
else if (atoi(timeout_val) > 0)
return atoi(timeout_val);
else {
printf("Timeout value must be a positive integer\n");
exit (STATE_UNKNOWN);
}
}
void usage(int result)
{
if (result != OK) {
printf("\n");
printf("Incorrect command line arguments supplied\n");
printf("\n");
}
printf("NRPE Plugin for Nagios\n");
printf("Version: %s\n", PROGRAM_VERSION);
printf("\n");
if (result != OK || show_help == TRUE) {
printf("Copyright (c) 2009-2017 Nagios Enterprises\n");
printf(" 1999-2008 Ethan Galstad (nagios@nagios.org)\n");
printf("\n");
printf("Last Modified: %s\n", MODIFICATION_DATE);
printf("\n");
printf("License: GPL v2 with exemptions (-l for more info)\n");
printf("\n");
#ifdef HAVE_SSL
printf("SSL/TLS Available: OpenSSL 0.9.6 or higher required\n");
printf("\n");
#endif
printf("Usage: check_nrpe -H <host> [-2] [-3] [-4] [-6] [-n] [-u] [-V] [-l] [-d <dhopt>]\n");
printf(" [-P <size>] [-S <ssl version>] [-L <cipherlist>] [-C <clientcert>]\n");
printf(" [-K <key>] [-A <ca-certificate>] [-s <logopts>] [-b <bindaddr>]\n");
printf(" [-f <cfg-file>] [-p <port>] [-t <interval>:<state>] [-g <log-file>]\n");
printf(" [-c <command>] [-E] [-D] [-a <arglist...>]\n");
printf("\n");
printf("Options:\n");
printf(" -H, --host=HOST The address of the host running the NRPE daemon\n");
printf(" -2, --v2-packets-only Only use version 2 packets, not version 3/4\n");
printf(" -3, --v3-packets-only Only use version 3 packets, not version 4\n");
printf(" -4, --ipv4 Bind to ipv4 only\n");
printf(" -6, --ipv6 Bind to ipv6 only\n");
printf(" -n, --no-ssl Do no use SSL\n");
printf(" -u, --unknown-timeout Make connection problems return UNKNOWN instead of CRITICAL\n");
printf(" -V, --version Print version info and quit\n");
printf(" -l, --license Show license\n");
printf(" -E, --stderr-to-stdout Redirect stderr to stdout\n");
printf(" -d, --use-adh=DHOPT Anonymous Diffie Hellman use:\n");
printf(" 0 Don't use Anonymous Diffie Hellman\n");
printf(" (This will be the default in a future release.)\n");
printf(" 1 Allow Anonymous Diffie Hellman (default)\n");
printf(" 2 Force Anonymous Diffie Hellman\n");
printf(" -D, --disable-syslog Disable logging to syslog facilities\n");
printf(" -P, --payload-size=SIZE Specify non-default payload size for NSClient++\n");
printf(" -S, --ssl-version=VERSION The SSL/TLS version to use. Can be any one of:\n");
#if OPENSSL_VERSION_NUMBER < 0x10100000
printf(" SSLv2 SSL v2 only\n");
printf(" SSLv2+ SSL v2 or above\n");
#endif
printf(" SSLv3 SSL v3 only\n");
printf(" SSLv3+ SSL v3 or above \n");
printf(" TLSv1 TLS v1 only\n");
printf(" TLSv1+ TLS v1 or above (DEFAULT)\n");
printf(" TLSv1.1 TLS v1.1 only\n");
printf(" TLSv1.1+ TLS v1.1 or above\n");
printf(" TLSv1.2 TLS v1.2 only\n");
printf(" TLSv1.2+ TLS v1.2 or above\n");
printf(" -L, --cipher-list=LIST The list of SSL ciphers to use (currently defaults\n");
#if OPENSSL_VERSION_NUMBER >= 0x10100000
printf(" to \"ALL:!MD5:@STRENGTH:@SECLEVEL=0\". THIS WILL change in a future release.)\n");
#else
printf(" to \"ALL:!MD5:@STRENGTH\". THIS WILL change in a future release.)\n");
#endif
printf(" -C, --client-cert=FILE The client certificate to use for PKI\n");
printf(" -K, --key-file=FILE The private key to use with the client certificate\n");
printf(" -A, --ca-cert-file=FILE The CA certificate to use for PKI\n");
printf(" -s, --ssl-logging=OPTIONS SSL Logging Options\n");
printf(" -b, --bind=IPADDR Local address to bind to\n");
printf(" -f, --config-file=FILE Configuration file to use\n");
printf(" -g, --log-file=FILE Log file to write to\n");
printf(" -p, --port=PORT The port on which the daemon is running (default=%d)\n", DEFAULT_SERVER_PORT);
printf(" -c, --command=COMMAND The name of the command that the remote daemon should run\n");
printf(" -a, --args=LIST Optional arguments that should be passed to the command,\n");
printf(" separated by a space. If provided, this must be the last\n");
printf(" option supplied on the command line.\n");
printf(" -e Enable syslog debug messages.\n");
printf("\n");
printf(" NEW TIMEOUT SYNTAX\n");
printf(" -t, --timeout=INTERVAL:STATE\n");
printf(" INTERVAL Number of seconds before connection times out (default=%d)\n", DEFAULT_SOCKET_TIMEOUT);
printf(" STATE Check state to exit with in the event of a timeout (default=CRITICAL)\n");
printf(" Timeout STATE must be a valid state name (case-insensitive) or integer:\n");
printf(" (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)\n");
printf("\n");
printf("Note:\n");
printf("This plugin requires that you have the NRPE daemon running on the remote host.\n");
printf("You must also have configured the daemon to associate a specific plugin command\n");
printf("with the [command] option you are specifying here. Upon receipt of the\n");
printf("[command] argument, the NRPE daemon will run the appropriate plugin command and\n");
printf("send the plugin output and return code back to *this* plugin. This allows you\n");
printf("to execute plugins on remote hosts and 'fake' the results to make Nagios think\n");
printf("the plugin is being run locally.\n");
printf("\n");
}
if (show_license == TRUE)
display_license();
exit(STATE_UNKNOWN);
}
void setup_ssl()
{
#ifdef HAVE_SSL
int vrfy, x;
if (sslprm.log_opts & SSL_LogStartup) {
char *val;
logit(LOG_INFO, "SSL Certificate File: %s", sslprm.cert_file ? sslprm.cert_file : "None");
logit(LOG_INFO, "SSL Private Key File: %s", sslprm.privatekey_file ? sslprm.privatekey_file : "None");
logit(LOG_INFO, "SSL CA Certificate File: %s", sslprm.cacert_file ? sslprm.cacert_file : "None");
logit(LOG_INFO, "SSL Cipher List: %s", sslprm.cipher_list);
logit(LOG_INFO, "SSL Allow ADH: %d", sslprm.allowDH);
logit(LOG_INFO, "SSL Log Options: 0x%02x", sslprm.log_opts);
switch (sslprm.ssl_proto_ver) {
case SSLv2:
val = "SSLv2";
break;
case SSLv2_plus:
val = "SSLv2 And Above";
break;
case SSLv3:
val = "SSLv3";
break;
case SSLv3_plus:
val = "SSLv3_plus And Above";
break;
case TLSv1:
val = "TLSv1";
break;
case TLSv1_plus:
val = "TLSv1_plus And Above";
break;
case TLSv1_1:
val = "TLSv1_1";
break;
case TLSv1_1_plus:
val = "TLSv1_1_plus And Above";
break;
case TLSv1_2:
val = "TLSv1_2";
break;
case TLSv1_2_plus:
val = "TLSv1_2_plus And Above";
break;
case TLSv1_3:
val = "TLSv1_3";
break;
case TLSv1_3_plus:
val = "TLSv1_3_plus And Above";
break;
default:
val = "INVALID VALUE!";
break;
}
logit(LOG_INFO, "SSL Version: %s", val);
}
/* initialize SSL */
if (use_ssl == TRUE) {
SSL_load_error_strings();
SSL_library_init();
ENGINE_load_builtin_engines();
RAND_set_rand_engine(NULL);
ENGINE_register_all_complete();
#if OPENSSL_VERSION_NUMBER >= 0x10100000
meth = TLS_method();
#else /* OPENSSL_VERSION_NUMBER >= 0x10100000 */
meth = SSLv23_client_method();
# ifndef OPENSSL_NO_SSL2
if (sslprm.ssl_proto_ver == SSLv2)
meth = SSLv2_client_method();
# endif
# ifndef OPENSSL_NO_SSL3
if (sslprm.ssl_proto_ver == SSLv3)
meth = SSLv3_client_method();
# endif
if (sslprm.ssl_proto_ver == TLSv1)
meth = TLSv1_client_method();
# ifdef SSL_TXT_TLSV1_1
if (sslprm.ssl_proto_ver == TLSv1_1)
meth = TLSv1_1_client_method();
# ifdef SSL_TXT_TLSV1_2
if (sslprm.ssl_proto_ver == TLSv1_2)
meth = TLSv1_2_client_method();
# ifdef SSL_TXT_TLSV1_3
if (sslprm.ssl_proto_ver == TLSv1_3)
meth = TLSv1_3_client_method();
# endif /* ifdef SSL_TXT_TLSV1_3 */
# endif /* ifdef SSL_TXT_TLSV1_2 */
# endif /* ifdef SSL_TXT_TLSV1_1 */
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000 */
if ((ctx = SSL_CTX_new(meth)) == NULL) {
printf("CHECK_NRPE: Error - could not create SSL context.\n");
exit(timeout_return_code);
}
#if OPENSSL_VERSION_NUMBER >= 0x10100000
SSL_CTX_set_max_proto_version(ctx, 0);
switch(sslprm.ssl_proto_ver) {
case TLSv1_3:
#if OPENSSL_VERSION_NUMBER >= 0x10101000
SSL_CTX_set_max_proto_version(ctx, TLS1_3_VERSION);
#endif
case TLSv1_3_plus:
#if OPENSSL_VERSION_NUMBER >= 0x10101000
SSL_CTX_set_min_proto_version(ctx, TLS1_3_VERSION);
break;
#endif
case TLSv1_2:
SSL_CTX_set_max_proto_version(ctx, TLS1_2_VERSION);
case TLSv1_2_plus:
SSL_CTX_set_min_proto_version(ctx, TLS1_2_VERSION);
break;
case TLSv1_1:
SSL_CTX_set_max_proto_version(ctx, TLS1_1_VERSION);
case TLSv1_1_plus:
SSL_CTX_set_min_proto_version(ctx, TLS1_1_VERSION);
break;
case TLSv1:
SSL_CTX_set_max_proto_version(ctx, TLS1_VERSION);
case TLSv1_plus:
SSL_CTX_set_min_proto_version(ctx, TLS1_VERSION);
break;
case SSLv3:
SSL_CTX_set_max_proto_version(ctx, SSL3_VERSION);
case SSLv3_plus:
SSL_CTX_set_min_proto_version(ctx, SSL3_VERSION);
break;
}
#else /* OPENSSL_VERSION_NUMBER >= 0x10100000 */
switch(sslprm.ssl_proto_ver) {
case SSLv2:
case SSLv2_plus:
break;
case TLSv1_3:
case TLSv1_3_plus:
#ifdef SSL_OP_NO_TLSv1_2
ssl_opts |= SSL_OP_NO_TLSv1_2;
#endif
case TLSv1_2:
case TLSv1_2_plus:
ssl_opts |= SSL_OP_NO_TLSv1_1;
case TLSv1_1:
case TLSv1_1_plus:
ssl_opts |= SSL_OP_NO_TLSv1;
case TLSv1:
case TLSv1_plus:
ssl_opts |= SSL_OP_NO_SSLv3;
case SSLv3:
case SSLv3_plus:
ssl_opts |= SSL_OP_NO_SSLv2;
break;
}
#endif /* OPENSSL_VERSION_NUMBER >= 0x10100000 */
SSL_CTX_set_options(ctx, ssl_opts);
if (sslprm.cert_file != NULL && sslprm.privatekey_file != NULL) {
if (!SSL_CTX_use_certificate_chain_file(ctx, sslprm.cert_file)) {
printf("Error: could not use certificate file '%s'.\n", sslprm.cert_file);
while ((x = ERR_get_error_line_data(NULL, NULL, NULL, NULL)) != 0) {
printf("Error: could not use certificate file '%s': %s\n", sslprm.cert_file, ERR_reason_error_string(x));
}
SSL_CTX_free(ctx);
exit(timeout_return_code);
}
if (!SSL_CTX_use_PrivateKey_file(ctx, sslprm.privatekey_file, SSL_FILETYPE_PEM)) {
SSL_CTX_free(ctx);
printf("Error: could not use private key file '%s'.\n", sslprm.privatekey_file);
while ((x = ERR_get_error_line_data(NULL, NULL, NULL, NULL)) != 0) {
printf("Error: could not use private key file '%s': %s\n", sslprm.privatekey_file, ERR_reason_error_string(x));
}
SSL_CTX_free(ctx);
exit(timeout_return_code);
}
}
if (sslprm.cacert_file != NULL) {
vrfy = SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
SSL_CTX_set_verify(ctx, vrfy, verify_callback);
if (!SSL_CTX_load_verify_locations(ctx, sslprm.cacert_file, NULL)) {
printf("Error: could not use CA certificate '%s'.\n", sslprm.cacert_file);
while ((x = ERR_get_error_line_data(NULL, NULL, NULL, NULL)) != 0) {
printf("Error: could not use CA certificate '%s': %s\n", sslprm.privatekey_file, ERR_reason_error_string(x));
}
SSL_CTX_free(ctx);
exit(timeout_return_code);
}
}
if (!sslprm.allowDH) {
if (strlen(sslprm.cipher_list) < sizeof(sslprm.cipher_list) - 6) {
strcat(sslprm.cipher_list, ":!ADH");
if (sslprm.log_opts & SSL_LogStartup)
logit(LOG_INFO, "New SSL Cipher List: %s", sslprm.cipher_list);
}
} else {
/* use anonymous DH ciphers */
if (sslprm.allowDH == 2) {
#if OPENSSL_VERSION_NUMBER >= 0x10100000
strncpy(sslprm.cipher_list, "ADH@SECLEVEL=0", MAX_FILENAME_LENGTH - 1);
#else
strncpy(sslprm.cipher_list, "ADH", MAX_FILENAME_LENGTH - 1);
#endif
}
}
if (SSL_CTX_set_cipher_list(ctx, sslprm.cipher_list) == 0) {
printf("Error: Could not set SSL/TLS cipher list: %s\n", sslprm.cipher_list);
while ((x = ERR_get_error_line_data(NULL, NULL, NULL, NULL)) != 0) {
printf("Could not set SSL/TLS cipher list '%s': %s\n", sslprm.cipher_list, ERR_reason_error_string(x));
}
SSL_CTX_free(ctx);
exit(timeout_return_code);
}
}
#endif
}
void set_sig_handlers()
{
#ifdef HAVE_SIGACTION
struct sigaction sig_action;
#endif
#ifdef HAVE_SIGACTION
sig_action.sa_sigaction = NULL;
sig_action.sa_handler = alarm_handler;
sigfillset(&sig_action.sa_mask);
sig_action.sa_flags = SA_NODEFER | SA_RESTART;
sigaction(SIGALRM, &sig_action, NULL);
#else
signal(SIGALRM, alarm_handler);
#endif /* HAVE_SIGACTION */
/* set socket timeout */
alarm(socket_timeout);
}
int connect_to_remote()
{
struct sockaddr_storage addr;
struct in_addr *inaddr;
socklen_t addrlen;
int result, rc, ssl_err, ern, x, nerrs = 0;
/* try to connect to the host at the given port number */
if ((sd = my_connect(server_name, &hostaddr, server_port, address_family, bind_address, stderr_to_stdout)) < 0)
exit(timeout_return_code);
result = STATE_OK;
addrlen = sizeof(addr);
rc = getpeername(sd, (struct sockaddr *)&addr, &addrlen);
if (addr.ss_family == AF_INET) {
struct sockaddr_in *addrin = (struct sockaddr_in *)&addr;
inaddr = &addrin->sin_addr;
} else {
struct sockaddr_in6 *addrin = (struct sockaddr_in6 *)&addr;
inaddr = (struct in_addr *)&addrin->sin6_addr;
}
if (inet_ntop(addr.ss_family, inaddr, rem_host, sizeof(rem_host)) == NULL)
strncpy(rem_host, "Unknown", sizeof(rem_host));
rem_host[MAX_HOST_ADDRESS_LENGTH - 1] = '\0';
if ((sslprm.log_opts & SSL_LogIpAddr) != 0)
logit(LOG_DEBUG, "Connected to %s", rem_host);
#ifdef HAVE_SSL
if (use_ssl == FALSE)
return result;
/* do SSL handshake */
if ((ssl = SSL_new(ctx)) == NULL) {
printf("CHECK_NRPE: Error - Could not create SSL connection structure.\n");
return timeout_return_code;
}
SSL_set_fd(ssl, sd);
if ((rc = SSL_connect(ssl)) != 1) {
ern = errno;
ssl_err = SSL_get_error(ssl, rc);
if (sslprm.log_opts & (SSL_LogCertDetails | SSL_LogIfClientCert)) {
rc = 0;
while ((x = ERR_get_error_line_data(NULL, NULL, NULL, NULL)) != 0) {
logit(LOG_ERR, "Error: (ERR_get_error_line_data = %d), Could not complete SSL handshake with %s: %s", x, rem_host, ERR_reason_error_string(x));
++nerrs;
}
if (nerrs == 0) {
logit(LOG_ERR, "Error: (nerrs = 0) Could not complete SSL handshake with %s: rc=%d SSL-error=%d", rem_host, rc, ssl_err);
}
} else {
while ((x = ERR_get_error_line_data(NULL, NULL, NULL, NULL)) != 0) {
logit(LOG_ERR, "Error: (!log_opts) Could not complete SSL handshake with %s: %s", rem_host, ERR_reason_error_string(x));
++nerrs;
}
if (nerrs == 0) {
logit(LOG_ERR, "Error: (nerrs = 0)(!log_opts) Could not complete SSL handshake with %s: rc=%d SSL-error=%d", rem_host, rc, ssl_err);
}
}
if (ssl_err == 5) {
/* Often, errno will be zero, so print a generic message here */
if (ern == 0)
printf("CHECK_NRPE: Error - Could not connect to %s. Check system logs on %s\n", rem_host, rem_host);
else
printf("CHECK_NRPE: Error - Could not connect to %s: %s\n", rem_host, strerror(ern));
} else {
printf("CHECK_NRPE: (ssl_err != 5) Error - Could not complete SSL handshake with %s: %d\n", rem_host, ssl_err);
}
# ifdef DEBUG
printf("SSL_connect=%d\n", rc);
/*
rc = SSL_get_error(ssl, rc);
printf("SSL_get_error=%d\n", rc);
printf("ERR_get_error=%lu\n", ERR_get_error());
printf("%s\n",ERR_error_string(rc, NULL));
*/
ERR_print_errors_fp(stdout);
# endif
result = timeout_return_code;
} else {
if (sslprm.log_opts & SSL_LogVersion)
logit(LOG_NOTICE, "Remote %s - SSL Version: %s", rem_host, SSL_get_version(ssl));
if (sslprm.log_opts & SSL_LogCipher) {
# if (defined(__sun) && defined(SOLARIS_10)) || defined(_AIX) || defined(__hpux)
SSL_CIPHER *c = SSL_get_current_cipher(ssl);
# else
const SSL_CIPHER *c = SSL_get_current_cipher(ssl);
# endif
logit(LOG_NOTICE, "Remote %s - %s, Cipher is %s", rem_host,
SSL_CIPHER_get_version(c), SSL_CIPHER_get_name(c));
}
if ((sslprm.log_opts & SSL_LogIfClientCert) || (sslprm.log_opts & SSL_LogCertDetails)) {
char peer_cn[256], buffer[2048];
X509 *peer = SSL_get_peer_certificate(ssl);
if (peer) {
if (sslprm.log_opts & SSL_LogIfClientCert)
logit(LOG_NOTICE, "SSL %s has %s certificate", rem_host, SSL_get_verify_result(ssl) == X509_V_OK ? "a valid" : "an invalid");
if (sslprm.log_opts & SSL_LogCertDetails) {
X509_NAME_oneline(X509_get_subject_name(peer), buffer, sizeof(buffer));
logit(LOG_NOTICE, "SSL %s Cert Name: %s", rem_host, buffer);
X509_NAME_oneline(X509_get_issuer_name(peer), buffer, sizeof(buffer));
logit(LOG_NOTICE, "SSL %s Cert Issuer: %s", rem_host, buffer);
}
} else
logit(LOG_NOTICE, "SSL Did not get certificate from %s", rem_host);
}
}
/* bail if we had errors */
if (result != STATE_OK) {
SSL_CTX_free(ctx);
close(sd);
exit(result);
}
#endif
return result;
}
int send_request()
{
v2_packet *v2_send_packet = NULL;
v3_packet *v3_send_packet = NULL;
u_int32_t calculated_crc32;
int rc, bytes_to_send, pkt_size;
char *send_pkt;
if (packet_ver == NRPE_PACKET_VERSION_2) {
pkt_size = sizeof(v2_packet);
if (payload_size > 0)
pkt_size = sizeof(v2_packet) - MAX_PACKETBUFFER_LENGTH + payload_size;
v2_send_packet = (v2_packet*)calloc(1, pkt_size);
send_pkt = (char *)v2_send_packet;
/* fill the packet with semi-random data */
randomize_buffer((char *)v2_send_packet, pkt_size);
/* initialize response packet data */
v2_send_packet->packet_version = htons(packet_ver);
v2_send_packet->packet_type = htons(QUERY_PACKET);
if (payload_size > 0) {
strncpy(&v2_send_packet->buffer[0], query, payload_size);
v2_send_packet->buffer[payload_size - 1] = '\x0';
} else {
strncpy(&v2_send_packet->buffer[0], query, MAX_PACKETBUFFER_LENGTH);
v2_send_packet->buffer[MAX_PACKETBUFFER_LENGTH - 1] = '\x0';
}
/* calculate the crc 32 value of the packet */
v2_send_packet->crc32_value = 0;
calculated_crc32 = calculate_crc32(send_pkt, pkt_size);
v2_send_packet->crc32_value = htonl(calculated_crc32);
} else {
pkt_size = (sizeof(v3_packet) - NRPE_V4_PACKET_SIZE_OFFSET) + strlen(query) + 1;
if (packet_ver == NRPE_PACKET_VERSION_3) {
pkt_size = (sizeof(v3_packet) - NRPE_V3_PACKET_SIZE_OFFSET) + strlen(query) + 1;
}
if (pkt_size < sizeof(v2_packet)) {
pkt_size = sizeof(v2_packet);
}
v3_send_packet = calloc(1, pkt_size);
send_pkt = (char *)v3_send_packet;
/* initialize response packet data */
v3_send_packet->packet_version = htons(packet_ver);
v3_send_packet->packet_type = htons(QUERY_PACKET);
v3_send_packet->alignment = 0;
v3_send_packet->buffer_length = pkt_size - sizeof(v3_packet);
v3_send_packet->buffer_length += (packet_ver == NRPE_PACKET_VERSION_4 ? NRPE_V4_PACKET_SIZE_OFFSET : NRPE_V3_PACKET_SIZE_OFFSET);
v3_send_packet->buffer_length = htonl(v3_send_packet->buffer_length);
strcpy(&v3_send_packet->buffer[0], query);
/* calculate the crc 32 value of the packet */
v3_send_packet->crc32_value = 0;
calculated_crc32 = calculate_crc32((char *)v3_send_packet, pkt_size);
v3_send_packet->crc32_value = htonl(calculated_crc32);
}
/* send the request to the remote */
bytes_to_send = pkt_size;
if (use_ssl == FALSE)
rc = sendall(sd, (char *)send_pkt, &bytes_to_send);
#ifdef HAVE_SSL
else {
rc = SSL_write(ssl, send_pkt, bytes_to_send);
if (rc < 0)
rc = -1;
}
#endif
if (v3_send_packet) {
free(v3_send_packet);
}
if (v2_send_packet) {
free(v2_send_packet);
}
if (rc == -1) {
printf("CHECK_NRPE: Error sending query to host.\n");
close(sd);
return STATE_UNKNOWN;
}
return STATE_OK;
}
int read_response()
{
v2_packet *v2_receive_packet = NULL;
/* Note: v4 packets will use the v3_packet structure */
v3_packet *v3_receive_packet = NULL;
u_int32_t packet_crc32;
u_int32_t calculated_crc32;
int32_t pkt_size, buffer_size;
int rc, result;
alarm(0);
set_sig_handlers();
#ifdef HAVE_SSL
rc = read_packet(sd, ssl, &v2_receive_packet, &v3_receive_packet);
#else
rc = read_packet(sd, NULL, &v2_receive_packet, &v3_receive_packet);
#endif
alarm(0);
/* close the connection */
#ifdef HAVE_SSL
if (use_ssl == TRUE) {
SSL_shutdown(ssl);
SSL_free(ssl);
SSL_CTX_free(ctx);
}
#endif
graceful_close(sd, 1000);
/* recv() error */
if (rc < 0) {
if (v2_receive_packet) {
free(v2_receive_packet);
}
if (v3_receive_packet) {
free(v3_receive_packet);
}
if (packet_ver >= NRPE_PACKET_VERSION_3) {
return -1;
}
return STATE_UNKNOWN;
} else if (rc == 0) {
/* server disconnected */
printf("CHECK_NRPE: Received 0 bytes from daemon. Check the remote server logs for error messages.\n");
if (v3_receive_packet) {
free(v3_receive_packet);
}
if (v2_receive_packet) {
free(v2_receive_packet);
}
return STATE_UNKNOWN;
}
/* check the crc 32 value */
if (packet_ver >= NRPE_PACKET_VERSION_3) {
buffer_size = ntohl(v3_receive_packet->buffer_length);
if (buffer_size < 0 || buffer_size > 65536) {
printf("CHECK_NRPE: Response packet had invalid buffer size.\n");
close(sd);
if (v3_receive_packet) {
free(v3_receive_packet);
}
if (v2_receive_packet) {
free(v2_receive_packet);
}
return STATE_UNKNOWN;
}
pkt_size = sizeof(v3_packet);
pkt_size -= (packet_ver == NRPE_PACKET_VERSION_3 ? NRPE_V3_PACKET_SIZE_OFFSET : NRPE_V4_PACKET_SIZE_OFFSET);
pkt_size += buffer_size;
packet_crc32 = ntohl(v3_receive_packet->crc32_value);
v3_receive_packet->crc32_value = 0L;
v3_receive_packet->alignment = 0;
calculated_crc32 = calculate_crc32((char *)v3_receive_packet, pkt_size);
} else {
pkt_size = sizeof(v2_packet);
if (payload_size > 0) {
pkt_size = sizeof(v2_packet) - MAX_PACKETBUFFER_LENGTH + payload_size;
}
packet_crc32 = ntohl(v2_receive_packet->crc32_value);
v2_receive_packet->crc32_value = 0L;
calculated_crc32 = calculate_crc32((char *)v2_receive_packet, pkt_size);
}
if (packet_crc32 != calculated_crc32) {
printf("CHECK_NRPE: Response packet had invalid CRC32.\n");
close(sd);
if (v3_receive_packet) {
free(v3_receive_packet);
}
if (v2_receive_packet) {
free(v2_receive_packet);
}
return STATE_UNKNOWN;
}
/* get the return code from the remote plugin */
/* and print the output returned by the daemon */
if (packet_ver >= NRPE_PACKET_VERSION_3) {
result = ntohs(v3_receive_packet->result_code);
if (v3_receive_packet->buffer_length == 0) {
printf("CHECK_NRPE: No output returned from daemon.\n");
} else {
printf("%s\n", v3_receive_packet->buffer);
}
} else {
result = ntohs(v2_receive_packet->result_code);
if (payload_size > 0) {
v2_receive_packet->buffer[payload_size - 1] = '\x0';
} else {
v2_receive_packet->buffer[MAX_PACKETBUFFER_LENGTH - 1] = '\x0';
}
if (!strcmp(v2_receive_packet->buffer, "")) {
printf("CHECK_NRPE: No output returned from daemon.\n");
} else if (strstr(v2_receive_packet->buffer, "Invalid packet version.3") != NULL) {
/* NSClient++ doesn't recognize it */
return -1;
} else {
printf("%s\n", v2_receive_packet->buffer);
}
}
if (v3_receive_packet) {
free(v3_receive_packet);
}
if (v2_receive_packet) {
free(v2_receive_packet);
}
return result;
}
int read_packet(int sock, void *ssl_ptr, v2_packet ** v2_pkt, v3_packet ** v3_pkt)
{
v2_packet packet;
int32_t pkt_size, common_size, tot_bytes, bytes_to_recv, buffer_size, bytes_read = 0;
int rc;
char *buff_ptr;
/* Read only the part that's common between versions 2 & 3 */
common_size = tot_bytes = bytes_to_recv = (char *)packet.buffer - (char *)&packet;
if (use_ssl == FALSE) {
rc = recvall(sock, (char *)&packet, &tot_bytes, socket_timeout);
if (rc <= 0 || rc != bytes_to_recv) {
if (rc < bytes_to_recv) {
if (packet_ver <= NRPE_PACKET_VERSION_3)
printf("CHECK_NRPE: Receive header underflow - only %d bytes received (%zu expected).\n", rc, sizeof(bytes_to_recv));
}
return -1;
}
if (packet_ver != ntohs(packet.packet_version)) {
printf("CHECK_NRPE: Invalid packet version received from server.\n");
return -1;
}
if (ntohs(packet.packet_type) != RESPONSE_PACKET) {
printf("CHECK_NRPE: Invalid packet type received from server.\n");
return -1;
}
if (packet_ver == NRPE_PACKET_VERSION_2) {
pkt_size = sizeof(v2_packet);
if (payload_size > 0) {
pkt_size = common_size + payload_size;
buffer_size = payload_size;
} else {
buffer_size = pkt_size - common_size;
}
if ((*v2_pkt = calloc(1, pkt_size)) == NULL) {
logit(LOG_ERR, "Error: Could not allocate memory for packet");
return -1;
}
memcpy(*v2_pkt, &packet, common_size);
buff_ptr = (*v2_pkt)->buffer;
memset(buff_ptr, 0, buffer_size);
} else {
pkt_size = sizeof(v3_packet) - 1;
/* Read the alignment filler */
bytes_to_recv = sizeof(int16_t);
rc = recvall(sock, (char *)&buffer_size, &bytes_to_recv, socket_timeout);
if (rc <= 0 || bytes_to_recv != sizeof(int16_t))
return -1;
tot_bytes += rc;
/* Read the buffer size */
bytes_to_recv = sizeof(buffer_size);
rc = recvall(sock, (char *)&buffer_size, &bytes_to_recv, socket_timeout);
if (rc <= 0 || bytes_to_recv != sizeof(buffer_size))
return -1;
tot_bytes += rc;
buffer_size = ntohl(buffer_size);
if (buffer_size < 0 || buffer_size > 65536) {
logit(LOG_ERR, "Error: Received packet with invalid buffer size");
return -1;
}
pkt_size += buffer_size;
if ((*v3_pkt = calloc(1, pkt_size)) == NULL) {
logit(LOG_ERR, "Error: Could not allocate memory for packet");
return -1;
}
memcpy(*v3_pkt, &packet, common_size);
(*v3_pkt)->buffer_length = htonl(buffer_size);
buff_ptr = (*v3_pkt)->buffer;
}
bytes_to_recv = buffer_size;
rc = recvall(sock, buff_ptr, &bytes_to_recv, socket_timeout);
if (rc <= 0 || rc != buffer_size) {
if (packet_ver >= NRPE_PACKET_VERSION_3) {
free(*v3_pkt);
*v3_pkt = NULL;
} else {
free(*v2_pkt);
*v2_pkt = NULL;
}
if (rc < buffer_size)
printf("CHECK_NRPE: Receive underflow - only %d bytes received (%zu expected).\n", rc, sizeof(buffer_size));
return -1;
} else
tot_bytes += rc;
}
#ifdef HAVE_SSL
else {
SSL *ssl = (SSL *) ssl_ptr;
while (((rc = SSL_read(ssl, &packet, bytes_to_recv)) <= 0)
&& (SSL_get_error(ssl, rc) == SSL_ERROR_WANT_READ)) {
}
if (rc <= 0 || rc != bytes_to_recv) {
if (rc < bytes_to_recv) {
if (packet_ver < NRPE_PACKET_VERSION_3 || packet_ver > NRPE_PACKET_VERSION_4)
printf("CHECK_NRPE: Receive header underflow - only %d bytes received (%zu expected).\n", rc, sizeof(bytes_to_recv));
}
return -1;
}
if (packet_ver != ntohs(packet.packet_version)) {
printf("CHECK_NRPE: Invalid packet version received from server.\n");
return -1;
}
if (ntohs(packet.packet_type) != RESPONSE_PACKET) {
printf("CHECK_NRPE: Invalid packet type received from server.\n");
return -1;
}
if (packet_ver == NRPE_PACKET_VERSION_2) {
pkt_size = sizeof(v2_packet);
if (payload_size > 0) {
pkt_size = common_size + payload_size;
buffer_size = payload_size;
} else
buffer_size = pkt_size - common_size;
if ((*v2_pkt = calloc(1, pkt_size)) == NULL) {
logit(LOG_ERR, "Error: Could not allocate memory for packet");
return -1;
}
memcpy(*v2_pkt, &packet, common_size);
buff_ptr = (*v2_pkt)->buffer;
memset(buff_ptr, 0, buffer_size);
} else {
pkt_size = sizeof(v3_packet) - 1;
/* Read the alignment filler */
bytes_to_recv = sizeof(int16_t);
while (((rc = SSL_read(ssl, &buffer_size, bytes_to_recv)) <= 0)
&& (SSL_get_error(ssl, rc) == SSL_ERROR_WANT_READ)) {
}
if (rc <= 0 || bytes_to_recv != sizeof(int16_t))
return -1;
tot_bytes += rc;
/* Read the buffer size */
bytes_to_recv = sizeof(buffer_size);
while (((rc = SSL_read(ssl, &buffer_size, bytes_to_recv)) <= 0)
&& (SSL_get_error(ssl, rc) == SSL_ERROR_WANT_READ)) {
}
if (rc <= 0 || bytes_to_recv != sizeof(buffer_size))
return -1;
tot_bytes += rc;
buffer_size = ntohl(buffer_size);
if (buffer_size < 0 || buffer_size > 65536) {
logit(LOG_ERR, "Error: Received packet with invalid buffer size");
return -1;
}
pkt_size += buffer_size;
if ((*v3_pkt = calloc(1, pkt_size)) == NULL) {
logit(LOG_ERR, "Error: Could not allocate memory for packet");
return -1;
}
memcpy(*v3_pkt, &packet, common_size);
(*v3_pkt)->buffer_length = htonl(buffer_size);
buff_ptr = (*v3_pkt)->buffer;
}
bytes_to_recv = buffer_size;
for (;;) {
while (((rc = SSL_read(ssl, &buff_ptr[bytes_read], bytes_to_recv)) <= 0)
&& (SSL_get_error(ssl, rc) == SSL_ERROR_WANT_READ)) {
}
if (rc <= 0)
break;
bytes_read += rc;
bytes_to_recv -= rc;
tot_bytes += rc;
}
if (rc < 0 || bytes_read != buffer_size) {
if (packet_ver >= NRPE_PACKET_VERSION_3) {
free(*v3_pkt);
*v3_pkt = NULL;
} else {
free(*v2_pkt);
*v2_pkt = NULL;
}
if (bytes_read != buffer_size) {
if (packet_ver >= NRPE_PACKET_VERSION_3) {
printf("CHECK_NRPE: Receive buffer size - %ld bytes received (%zu expected).\n", (long)bytes_read, sizeof(buffer_size));
} else {
printf("CHECK_NRPE: Receive underflow - only %ld bytes received (%zu expected).\n", (long)bytes_read, sizeof(buffer_size));
}
}
return -1;
}
}
#endif
return tot_bytes;
}
#ifdef HAVE_SSL
int verify_callback(int preverify_ok, X509_STORE_CTX * ctx)
{
char name[256], issuer[256];
X509 *err_cert;
int err;
SSL *ssl;
if (preverify_ok || ((sslprm.log_opts & SSL_LogCertDetails) == 0))
return preverify_ok;
err_cert = X509_STORE_CTX_get_current_cert(ctx);
err = X509_STORE_CTX_get_error(ctx);
/* Get the pointer to the SSL of the current connection */
ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
X509_NAME_oneline(X509_get_subject_name(err_cert), name, 256);
X509_NAME_oneline(X509_get_issuer_name(err_cert), issuer, 256);
if (!preverify_ok && sslprm.client_certs >= Ask_For_Cert
&& (sslprm.log_opts & SSL_LogCertDetails)) {
logit(LOG_ERR, "SSL Client has an invalid certificate: %s (issuer=%s) err=%d:%s", name, issuer, err, X509_verify_cert_error_string(err));
}
return preverify_ok;
}
#endif
void alarm_handler(int sig)
{
const char msg1[] = "CHECK_NRPE STATE ";
const char msg2[] = ": Socket timeout after ";
const char msg3[] = " seconds.\n";
const char *text = state_text(timeout_return_code);
size_t lth1 = 0, lth2 = 0;
for (lth1 = 0; lth1 < 10; ++lth1)
if (text[lth1] == 0)
break;
for (lth2 = 0; lth2 < 10; ++lth2)
if (timeout_txt[lth2] == 0)
break;
if ((write(STDOUT_FILENO, msg1, sizeof(msg1) - 1) == -1)
|| (write(STDOUT_FILENO, text, lth1) == -1)
|| (write(STDOUT_FILENO, msg2, sizeof(msg2) - 1) == -1)
|| (write(STDOUT_FILENO, timeout_txt, lth2) == -1)
|| (write(STDOUT_FILENO, msg3, sizeof(msg3) - 1) == -1)) {
logit(LOG_ERR, "ERROR: alarm_handler() write(): %s", strerror(errno));
}
exit(timeout_return_code);
}
/* submitted by Mark Plaksin 08/31/2006 */
int graceful_close(int sd, int timeout)
{
fd_set in;
struct timeval tv;
char buf[1000];
/* send FIN packet */
shutdown(sd, SHUT_WR);
for (;;) {
FD_ZERO(&in);
FD_SET(sd, &in);
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
/* timeout or error */
if (1 != select(sd + 1, &in, NULL, NULL, &tv))
break;
/* no more data (FIN or RST) */
if (0 >= recv(sd, buf, sizeof(buf), 0))
break;
}
#ifdef HAVE_CLOSESOCKET
closesocket(sd);
#else
close(sd);
#endif
return OK;
}