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main.c
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/*
* This is the main module of the CNTLM
*
* CNTLM 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.
*
* CNTLM 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., 51 Franklin
* St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (c) 2007 David Kubicek
*
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <pthread.h>
#include <limits.h>
#include <stdio.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <netdb.h>
#include <ctype.h>
#include <pwd.h>
#include <fcntl.h>
#include <syslog.h>
#include <termios.h>
#include <fnmatch.h>
#include <assert.h>
#ifdef __CYGWIN__
#include <windows.h>
#endif
/*
* Some helping routines like linked list manipulation substr(), memory
* allocation, NTLM authentication routines, etc.
*/
#include "config/config.h"
#include "socket.h"
#include "utils.h"
#include "ntlm.h"
#include "swap.h"
#include "config.h"
#include "acl.h"
#include "auth.h"
#include "http.h"
#include "globals.h"
#include "pages.h"
#include "forward.h" /* code serving via parent proxy */
#include "direct.h" /* code serving directly without proxy */
#include "proxy.h"
#include "pac.h"
#ifdef __CYGWIN__
#include "sspi.h" /* code for SSPI management */
#endif
#ifdef ENABLE_KERBEROS
#include "kerberos.h"
#endif
#define STACK_SIZE sizeof(void *)*8*1024
/*
* Global "read-only" data initialized in main(). Comments list funcs. which use
* them. Having these global avoids the need to pass them to each thread and
* from there again a few times to inner calls.
*/
int debug = 0; /* all debug printf's and possibly external modules */
struct auth_s *g_creds = NULL; /* throughout the whole module */
int quit = 0; /* sighandler() */
int ntlmbasic = 0; /* forward_request() */
int serialize = 0;
int scanner_plugin = 0;
long scanner_plugin_maxsize = 0;
/*
* List of finished threads. Each forward_request() thread adds itself to it when
* finished. Main regularly joins and removes all tid's in there.
*/
plist_t threads_list = NULL;
pthread_mutex_t threads_mtx = PTHREAD_MUTEX_INITIALIZER;
/*
* List of cached connections. Accessed by each thread forward_request().
*/
plist_t connection_list = NULL;
pthread_mutex_t connection_mtx = PTHREAD_MUTEX_INITIALIZER;
/*
* List of custom header substitutions, SOCKS5 proxy users and
* UserAgents for the scanner plugin.
*/
hlist_t header_list = NULL; /* forward_request() */
hlist_t users_list = NULL; /* socks5_thread() */
plist_t scanner_agent_list = NULL; /* scanner_hook() */
plist_t noproxy_list = NULL; /* proxy_thread() */
/* 1 = Pac engine is initialized and in use. */
int pac_initialized = 0;
/*
* General signal handler. If in debug mode, quit immediately.
*/
void sighandler(int p) {
if (!quit)
syslog(LOG_INFO, "Signal %d received, issuing clean shutdown\n", p);
else
syslog(LOG_INFO, "Signal %d received, forcing shutdown\n", p);
if (quit++ || debug)
quit++;
}
/*
* Register and bind new proxy service port.
*/
void listen_add(const char *service, plist_t *list, char *spec, int gateway) {
struct addrinfo *addresses;
int i;
int p;
int port;
char *tmp;
char *q = strrchr(spec, ':');
if (q != NULL) {
p = (int)(q - spec);
if(spec[0] == '[' && spec[p-1] == ']') {
tmp = substr(spec, 1, p-2);
} else {
tmp = substr(spec, 0, p);
}
port = atoi(spec+p+1);
if (!port || !so_resolv(&addresses, tmp, port)) {
syslog(LOG_ERR, "Cannot resolve listen address %s\n", spec);
myexit(1);
}
free(tmp);
} else {
port = atoi(spec);
if (!port) {
syslog(LOG_ERR, "Cannot resolve listen address %s\n", spec);
myexit(1);
}
so_resolv_wildcard(&addresses, port, gateway);
}
i = so_listen(list, addresses, NULL);
if (i > 0) {
syslog(LOG_INFO, "New %s service on %s\n", service, spec);
}
freeaddrinfo(addresses);
}
/*
* Register a new tunnel definition, bind service port.
*/
void tunnel_add(plist_t *list, char *spec, int gateway) {
struct addrinfo *addresses;
int i;
int len;
int count;
int pos;
int port;
char *field[4];
char *tmp;
spec = strdup(spec);
len = strlen(spec);
field[0] = spec;
for (count = 1, i = 0; count < 4 && i < len; ++i)
if (spec[i] == ':') {
spec[i] = 0;
field[count++] = spec+i+1;
}
pos = 0;
if (count == 4) {
port = atoi(field[pos+1]);
if (!port || !so_resolv(&addresses, field[pos], port)) {
syslog(LOG_ERR, "Cannot resolve tunnel bind address: %s:%s\n", field[pos], field[pos+1]);
myexit(1);
}
pos++;
} else {
port = atoi(field[pos]);
if(!port) {
syslog(LOG_ERR, "Invalid tunnel local port: %s\n", field[pos]);
myexit(1);
}
so_resolv_wildcard(&addresses, port, gateway);
}
if (count-pos == 3) {
if (!strlen(field[pos+1]) || !strlen(field[pos+2])) {
syslog(LOG_ERR, "Invalid tunnel target: %s:%s\n", field[pos+1], field[pos+2]);
myexit(1);
}
const size_t tmp_len = strlen(field[pos+1]) + strlen(field[pos+2]) + 2 + 1;
tmp = zmalloc(tmp_len);
strlcpy(tmp, field[pos+1], tmp_len);
strlcat(tmp, ":", tmp_len);
strlcat(tmp, field[pos+2], tmp_len);
i = so_listen(list, addresses, tmp);
if (i > 0) {
syslog(LOG_INFO, "New tunnel to %s\n", tmp);
} else {
syslog(LOG_ERR, "Unable to bind tunnel");
free(tmp);
}
} else {
printf("Tunnel specification incorrect ([laddress:]lport:rserver:rport).\n");
myexit(1);
}
free(spec);
freeaddrinfo(addresses);
}
/*
* Add no-proxy hostname/IP
*/
plist_t noproxy_add(plist_t list, char *spec) {
char *tok;
char *save;
tok = strtok_r(spec, ", ", &save);
while ( tok != NULL ) {
if (debug)
printf("Adding no-proxy for: '%s'\n", tok);
list = plist_add(list, 0, strdup(tok));
tok = strtok_r(NULL, ", ", &save);
}
return list;
}
int noproxy_match(const char *addr) {
plist_const_t list;
list = noproxy_list;
while (list) {
if (list->aux && strlen(list->aux)
&& fnmatch(list->aux, addr, 0) == 0) {
if (debug)
printf("MATCH: %s (%s)\n", addr, (char *)list->aux);
return 1;
} else if (debug)
printf(" NO: %s (%s)\n", addr, (char *)list->aux);
list = list->next;
}
return 0;
}
/*
* Proxy thread - decide between direct and forward based on NoProxy
* TODO: update
*/
void *proxy_thread(void *thread_data) {
rr_data_t request;
rr_data_t ret;
int keep_alive; /* Proxy-Connection */
int cd = ((struct thread_arg_s *)thread_data)->fd;
do {
ret = NULL;
keep_alive = 0;
if (debug) {
printf("\n******* Round 1 C: %d *******\n", cd);
printf("Reading headers (%d)...\n", cd);
}
request = new_rr_data();
if (!headers_recv(cd, request)) {
free_rr_data(&request);
break;
}
do {
/*
* Are we being returned a request by forward_request or direct_request?
*/
if (ret) {
free_rr_data(&request);
request = ret;
}
keep_alive = hlist_subcmp(request->headers, "Proxy-Connection", "keep-alive");
if (noproxy_match(request->hostname)) {
/* No-proxy-list has highest precedence */
ret = direct_request(thread_data, request);
} else {
ret = forward_request(thread_data, request);
if (ret == (void *)-2)
ret = direct_request(thread_data, request);
}
if (debug)
printf("proxy_thread: request rc = %p\n", (void *)ret);
} while (ret != NULL && ret != (void *)-1);
free_rr_data(&request);
/*
* If client asked for proxy keep-alive, loop unless the last server response
* requested (Proxy-)Connection: close.
*/
} while (keep_alive && ret != (void *)-1 && !serialize);
free(thread_data);
close(cd);
/*
* Add ourself to the "threads to join" list.
*/
if (!serialize) {
pthread_mutex_lock(&threads_mtx);
pthread_t thread_id = pthread_self();
threads_list = plist_add(threads_list, (unsigned long)thread_id, NULL);
pthread_mutex_unlock(&threads_mtx);
}
return NULL;
}
/*
* Tunnel/port forward thread - this method is obviously better solution than using extra
* tools like "corkscrew" which after all require us for authentication and tunneling
* their HTTP CONNECT in the first place.
*/
void *tunnel_thread(void *thread_data) {
char *hostname;
char *pos;
assert(thread_data != NULL);
const char * const thost = ((struct thread_arg_s *)thread_data)->target;
hostname = strdup(thost);
if ((pos = strchr(hostname, ':')) != NULL)
*pos = 0;
if (noproxy_match(hostname)) {
direct_tunnel(thread_data);
} else {
if (forward_tunnel(thread_data) == -2)
direct_tunnel(thread_data);
}
free(hostname);
free(thread_data);
/*
* Add ourself to the "threads to join" list.
*/
if (!serialize) {
pthread_mutex_lock(&threads_mtx);
pthread_t thread_id = pthread_self();
threads_list = plist_add(threads_list, (unsigned long)thread_id, NULL);
pthread_mutex_unlock(&threads_mtx);
}
return NULL;
}
/*
* SOCKS5 thread
*/
void *socks5_thread(void *thread_data) {
static const uint8_t SOCKS5_AUTH_NO_AUTHENTICATION_REQUIRED = 0x00;
static const uint8_t SOCKS5_AUTH_USERNAME_PASSWORD = 0x02;
static const uint8_t SOCKS5_AUTH_NO_ACCEPTABLE_METHODS = 0xFF;
char *thost;
char *tport;
char *uname;
char *upass;
unsigned short port;
int ver;
int r;
int c;
int i;
int w;
struct auth_s *tcreds = NULL;
unsigned char *bs = NULL;
unsigned char *auths = NULL;
unsigned char *addr = NULL;
int found = -1;
int sd = -1;
int open = !hlist_count(users_list);
int cd = ((struct thread_arg_s *)thread_data)->fd;
char saddr[INET6_ADDRSTRLEN] = {0};
INET_NTOP(&((struct thread_arg_s *)thread_data)->addr, saddr, INET6_ADDRSTRLEN);
free(thread_data);
/*
* Check client's version, possibly fuck'em
*/
bs = (unsigned char *)zmalloc(10);
thost = zmalloc(HOST_BUFSIZE);
tport = zmalloc(MINIBUF_SIZE);
r = read(cd, bs, 2);
if (r != 2 || bs[0] != 5)
goto bailout;
/*
* Read offered auth schemes
*/
c = bs[1];
auths = (unsigned char *)zmalloc(c+1);
r = read(cd, auths, c);
if (r != c)
goto bailout;
/*
* Are we wide open and client is OK with no auth?
*/
if (open) {
for (i = 0; i < c && found < 0; ++i) {
if (auths[i] == SOCKS5_AUTH_NO_AUTHENTICATION_REQUIRED) {
found = auths[i];
}
}
}
/*
* If not, accept plain auth if offered
*/
if (found < 0) {
for (i = 0; i < c && found < 0; ++i) {
if (auths[i] == SOCKS5_AUTH_USERNAME_PASSWORD) {
found = auths[i];
}
}
}
/*
* If not open and no auth offered or open and auth requested, fuck'em
* and complete the handshake
*/
if (found < 0) {
bs[0] = 5;
bs[1] = SOCKS5_AUTH_NO_ACCEPTABLE_METHODS;
(void) write_wrapper(cd, bs, 2); // We don't really care about the result
goto bailout;
} else {
bs[0] = 5;
bs[1] = found;
w = write_wrapper(cd, bs, 2);
if (w != 2) {
syslog(LOG_ERR, "SOCKS5: write() for accepting AUTH method failed.\n");
}
}
/*
* Plain auth negotiated?
*/
if (found != 0) {
/*
* Check ver and read username len
*/
r = read(cd, bs, 2);
if (r != 2) {
bs[0] = 1;
bs[1] = 0xFF; /* Unsuccessful (not supported) */
(void) write_wrapper(cd, bs, 2);
goto bailout;
}
c = bs[1]; // ULEN
/*
* Read username and pass len
*/
uname = zmalloc(c+1);
r = read(cd, uname, c+1);
if (r != c+1) {
free(uname);
goto bailout;
}
i = uname[c]; // PLEN
uname[c] = 0;
c = i;
/*
* Read pass
*/
upass = zmalloc(c+1);
r = read(cd, upass, c);
if (r != c) {
free(upass);
free(uname);
goto bailout;
}
upass[c] = 0;
/*
* Check credentials against the list
*/
const char * tmp = hlist_get(users_list, uname);
if (!hlist_count(users_list) || (tmp && !strcmp(tmp, upass))) {
bs[0] = 1;
bs[1] = 0; /* Success */
} else {
bs[0] = 1;
bs[1] = 0xFF; /* Failed */
}
/*
* Send response
*/
w = write_wrapper(cd, bs, 2);
if (w != 2) {
syslog(LOG_ERR, "SOCKS5: write() for response of credentials check failed.\n");
}
free(upass);
free(uname);
/*
* Fuck'em if auth failed
*/
if (bs[1])
goto bailout;
}
/*
* Read request type
*/
r = read(cd, bs, 4);
if (r != 4)
goto bailout;
/*
* Is it connect for supported address type (IPv4 or DNS)? If not, fuck'em
*/
if (bs[1] != 1 || (bs[3] != 1 && bs[3] != 3)) {
bs[0] = 5;
bs[1] = 2; /* Not allowed */
bs[2] = 0;
bs[3] = 1; /* Dummy IPv4 */
memset(bs+4, 0, 6);
(void) write_wrapper(cd, bs, 10);
goto bailout;
}
/*
* Ok, it's connect to a domain or IP
* Let's read dest address
*/
if (bs[3] == 1) {
ver = 1; /* IPv4, we know the length */
c = 4;
} else if (bs[3] == 3) {
uint8_t string_length;
ver = 2; /* FQDN, get string length */
r = read(cd, &string_length, 1);
if (r != 1)
goto bailout;
c = string_length;
} else
goto bailout;
addr = (unsigned char *)zmalloc(c + 10 + 1);
r = read(cd, addr, c);
if (r != c)
goto bailout;
addr[c] = 0;
/*
* Convert the address to character string
*/
if (ver == 1) {
snprintf(thost, HOST_BUFSIZE, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]); /* It's in network byte order */
} else {
strlcpy(thost, (char *)addr, HOST_BUFSIZE);
}
/*
* Read port number and convert to host byte order int
*/
r = read(cd, &port, 2);
if (r != 2)
goto bailout;
i = 0;
if (noproxy_match(thost)) {
sd = host_connect(thost, ntohs(port));
i = (sd >= 0);
} else {
snprintf(tport, MINIBUF_SIZE, "%d", ntohs(port));
char *hostname = strdup(thost);
strlcat(thost, ":", HOST_BUFSIZE);
strlcat(thost, tport, HOST_BUFSIZE);
tcreds = new_auth();
sd = proxy_connect(tcreds, thost, hostname);
if (sd == -2) {
sd = host_connect(hostname, ntohs(port));
i = (sd >= 0);
} else if (sd >= 0) {
i = prepare_http_connect(sd, tcreds, thost);
}
free(hostname);
}
/*
* Direct or proxy connect?
*/
if (!i) {
/*
* Connect/tunnel failed, report
*/
bs[0] = 5;
bs[1] = 1; /* General failure */
bs[2] = 0;
bs[3] = 1; /* Dummy IPv4 */
memset(bs+4, 0, 6);
(void) write_wrapper(cd, bs, 10);
goto bailout;
} else {
/*
* All right
*/
bs[0] = 5;
bs[1] = 0; /* Success */
bs[2] = 0;
bs[3] = 1; /* Dummy IPv4 */
memset(bs+4, 0, 6);
w = write_wrapper(cd, bs, 10);
if (w != 10) {
syslog(LOG_ERR, "SOCKS5: write() for reporting success for connect failed.\n");
}
}
syslog(LOG_DEBUG, "%s SOCKS %s", saddr, thost);
/*
* Let's give them bi-directional connection they asked for
*/
tunnel(cd, sd);
bailout:
if (addr)
free(addr);
if (auths)
free(auths);
if (thost)
free(thost);
if (tport)
free(tport);
if (bs)
free(bs);
if (tcreds)
free(tcreds);
if (sd >= 0)
close(sd);
close(cd);
/*
* Add ourself to the "threads to join" list.
*/
if (!serialize) {
pthread_mutex_lock(&threads_mtx);
pthread_t thread_id = pthread_self();
threads_list = plist_add(threads_list, (unsigned long)thread_id, NULL);
pthread_mutex_unlock(&threads_mtx);
}
return NULL;
}
int main(int argc, char **argv) {
char *tmp;
char *head;
char *cpassword;
char *cpassntlm2;
char *cpassnt;
char *cpasslm;
char *cuser;
char *cdomain;
char *cworkstation;
char *cuid;
char *cpidfile;
char *cauth;
struct termios termold;
struct termios termnew;
pthread_attr_t pattr;
pthread_t pthr;
hlist_const_t list;
int i;
int w;
int cd = 0;
int help = 0;
int nuid = 0;
int ngid = 0;
int gateway = 0;
unsigned int tc = 0; ///< Total number of created threads
unsigned int tj = 0; ///< Total number of terminated threads
int interactivepwd = 0;
int interactivehash = 0;
int tracefile = 0;
int cflags = 0;
int asdaemon = 1;
char *myconfig = NULL;
plist_t tunneld_list = NULL;
plist_t proxyd_list = NULL;
plist_t socksd_list = NULL;
plist_t rules = NULL;
config_t cf = NULL;
char *magic_detect = NULL;
int pac = 0;
char *pac_file;
pac_file = zmalloc(PATH_MAX);
g_creds = new_auth();
cuser = zmalloc(MINIBUF_SIZE);
cdomain = zmalloc(MINIBUF_SIZE);
cpassword = zmalloc(MINIBUF_SIZE);
cpassntlm2 = zmalloc(MINIBUF_SIZE);
cpassnt = zmalloc(MINIBUF_SIZE);
cpasslm = zmalloc(MINIBUF_SIZE);
cworkstation = zmalloc(MINIBUF_SIZE);
cpidfile = zmalloc(MINIBUF_SIZE);
cuid = zmalloc(MINIBUF_SIZE);
cauth = zmalloc(MINIBUF_SIZE);
int syslog_debug = 0;
openlog("cntlm", LOG_CONS | LOG_PERROR, LOG_DAEMON);
#if config_endian == 0
syslog(LOG_INFO, "Starting cntlm version " VERSION " for BIG endian\n");
#else
syslog(LOG_INFO, "Starting cntlm version " VERSION " for LITTLE endian\n");
#endif
while ((i = getopt(argc, argv, ":-:T:a:c:d:fghIl:p:r:su:vw:x:A:BD:F:G:HL:M:N:O:P:R:S:U:X:q")) != -1) {
switch (i) {
case 'A':
case 'D':
if (!acl_add(&rules, optarg, (i == 'A' ? ACL_ALLOW : ACL_DENY)))
myexit(1);
break;
case 'a':
strlcpy(cauth, optarg, MINIBUF_SIZE);
break;
case 'B':
ntlmbasic = 1;
break;
case 'c':
myconfig = strdup(optarg);
break;
case 'd':
strlcpy(cdomain, optarg, MINIBUF_SIZE);
break;
#ifdef ENABLE_PAC
case 'x':
pac = 1;
/*
* Resolve relative paths if necessary.
* Don't care if the named file does not exist (ENOENT) because
* later on we check the file's availability anyway.
*/
if (!realpath(optarg, pac_file) && errno != ENOENT) {
syslog(LOG_ERR, "Resolving path to PAC file failed: %s\n", strerror(errno));
myexit(1);
}
break;
#endif
case 'F':
cflags = swap32(strtoul(optarg, &tmp, 0));
break;
case 'f':
asdaemon = 0;
break;
case 'G':
if (strlen(optarg)) {
scanner_plugin = 1;
if (!scanner_plugin_maxsize)
scanner_plugin_maxsize = 1;
i = strlen(optarg) + 3;
tmp = zmalloc(i);
snprintf(tmp, i, "*%s*", optarg);
scanner_agent_list = plist_add(scanner_agent_list, 0, tmp);
}
break;
case 'g':
gateway = 1;
break;
case 'H':
interactivehash = 1;
break;
case 'I':
interactivepwd = 1;
break;
case 'L':
/*
* Parse and validate the argument.
* Create a listening socket for tunneling.
*/
tunnel_add(&tunneld_list, optarg, gateway);
break;
case 'l':
/*
* Create a listening socket for proxy function.
*/
listen_add("Proxy", &proxyd_list, optarg, gateway);
break;
case 'M':
magic_detect = strdup(optarg);
break;
case 'N':
noproxy_list = noproxy_add(noproxy_list, tmp=strdup(optarg));
free(tmp);
break;
case 'O':
listen_add("SOCKS5 proxy", &socksd_list, optarg, gateway);
break;
case 'P':
strlcpy(cpidfile, optarg, MINIBUF_SIZE);
break;
case 'p':
/*
* Overwrite the password parameter with '*'s to make it
* invisible in "ps", /proc, etc.
*/
strlcpy(cpassword, optarg, MINIBUF_SIZE);
for (i = strlen(optarg)-1; i >= 0; --i)
optarg[i] = '*';
break;
case 'R':
tmp = strdup(optarg);
head = strchr(tmp, ':');
if (!head) {
fprintf(stderr, "Invalid username:password format for -R: %s\n", tmp);
} else {
head[0] = 0;
users_list = hlist_add(users_list, tmp, head+1,
HLIST_ALLOC, HLIST_ALLOC);
}
break;
case 'r':
if (is_http_header(optarg))
header_list = hlist_add(header_list,
get_http_header_name(optarg),
get_http_header_value(optarg),
HLIST_NOALLOC, HLIST_NOALLOC);
break;
case 'S':
scanner_plugin = 1;
scanner_plugin_maxsize = atol(optarg);
break;
case 's':
/*
* Do not use threads - for debugging purposes only
*/
serialize = 1;
break;
case 'T':
debug = 1;
syslog_debug = 1;
asdaemon = 0;
tracefile = open(optarg, O_CREAT | O_TRUNC | O_WRONLY, 0600);
if (tracefile < 0) {
fprintf(stderr, "Cannot create trace file.\n");
myexit(1);
} else {
printf("Redirecting all output to %s\n", optarg);
dup2(tracefile, 1);
dup2(tracefile, 2);
}
break;
case 'U':
strlcpy(cuid, optarg, MINIBUF_SIZE);
break;
case 'u':
i = strcspn(optarg, "@");
if (i != (int)strlen(optarg)) {
strlcpy(cuser, optarg, MIN(MINIBUF_SIZE, i+1));
strlcpy(cdomain, optarg+i+1, MINIBUF_SIZE);
} else {
strlcpy(cuser, optarg, MINIBUF_SIZE);
}
break;
case 'v':
debug = 1;
syslog_debug = 1;
asdaemon = 0;
break;
case 'w':
strlcpy(cworkstation, optarg, MINIBUF_SIZE);
break;
case 'X':
#ifdef __CYGWIN__
if (!sspi_set(optarg))
{
fprintf(stderr, "SSPI initialize failed (%s)! Proceeding with SSPI disabled.\n", optarg);
} else {
syslog(LOG_INFO, "SSPI %s mode enabled!", optarg);
}
#else
fprintf(stderr, "This feature is available under Windows only!\n");
help = 1;
#endif
break;
case 'q':
syslog_debug = 1;
break;
case 'h':
help = 1;
break;
default:
help = 2;
}
}
/*
* Help requested?
*/
if (help > 0) {
printf("CNTLM - Accelerating NTLM Authentication Proxy version " VERSION "\n");
printf("Copyright (c) 2oo7-2o1o David Kubicek\n\n"
"This program comes with NO WARRANTY, to the extent permitted by law. You\n"
"may redistribute copies of it under the terms of the GNU GPL Version 2 or\n"
"newer. For more information about these matters, see the file LICENSE.\n"
"For copyright holders of included encryption routines see headers.\n\n");
FILE * stream = stdout;
int exit_code = 0;
if (help > 1) {
stream = stderr;
exit_code = 1;
}
fprintf(stream, "Usage: %s [-AaBcDdFfGgHhILlMNOPpqRrSsTUuvwXx] <proxy_host>[:]<proxy_port> ...\n", argv[0]);
fprintf(stream, "\t-A <address>[/<net>]\n"
"\t ACL allow rule. IP or hostname, net must be a number (CIDR notation)\n");
fprintf(stream, "\t-a ntlm | nt | lm"
#ifdef ENABLE_KERBEROS
" | gss\n"
"\t Authentication type - combined NTLM, just LM, just NT, or GSS. Default NTLM.\n"
"\t GSS activates kerberos auth: you need a cached credential.\n"
#else
"\n"
"\t Authentication type - combined NTLM, just LM, or just NT. Default NTLM.\n"
#endif
"\t NTLM is the most versatile setting and likely to work for you.\n");
fprintf(stream, "\t-B Enable NTLM-to-basic authentication.\n");
fprintf(stream, "\t-c <config_file>\n"
"\t Configuration file. Other arguments can be used as well, overriding\n"
"\t config file settings.\n");
fprintf(stream, "\t-D <address>[/<net>]\n"
"\t ACL deny rule. Syntax same as -A.\n");
fprintf(stream, "\t-d <domain>\n"
"\t Domain/workgroup can be set separately.\n");
fprintf(stream, "\t-F <flags>\n"
"\t NTLM authentication flags.\n");
fprintf(stream, "\t-f Run in foreground, do not fork into daemon mode.\n");
fprintf(stream, "\t-G <pattern>\n"
"\t User-Agent matching for the trans-isa-scan plugin.\n");
fprintf(stream, "\t-g Gateway mode - listen on all interfaces, not only loopback.\n");
fprintf(stream, "\t-H Print password hashes for use in config file (NTLMv2 needs -u and -d).\n");
fprintf(stream, "\t-h Print this help info along with version number.\n");
fprintf(stream, "\t-I Prompt for the password interactively.\n");
fprintf(stream, "\t-L [<saddr>:]<lport>:<rhost>:<rport>\n"
"\t Forwarding/tunneling a la OpenSSH. Same syntax - listen on lport\n"
"\t and forward all connections through the proxy to rhost:rport.\n"
"\t Can be used for direct tunneling without corkscrew, etc.\n");
fprintf(stream, "\t-l [<saddr>:]<lport>\n"
"\t Main listening port for the NTLM proxy.\n");
fprintf(stream, "\t-M <testurl>\n"
"\t Magic autodetection of proxy's NTLM dialect.\n");
fprintf(stream, "\t-N \"<hostname_wildcard1>[, <hostname_wildcardN>\"\n"
"\t List of URL's to serve directly as stand-alone proxy (e.g. '*.local')\n");
fprintf(stream, "\t-O [<saddr>:]<lport>\n"
"\t Enable SOCKS5 proxy on port lport (binding to address saddr)\n");