зеркало из https://github.com/github/putty.git
306 строки
7.8 KiB
C
306 строки
7.8 KiB
C
/*
|
|
* 'psusan': Pseudo Ssh for Untappable, Separately Authenticated Networks
|
|
*
|
|
* This is a standalone application that speaks on its standard I/O
|
|
* the server end of the bare ssh-connection protocol used by PuTTY's
|
|
* connection sharing.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include <stdarg.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <termios.h>
|
|
#include <pwd.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/time.h>
|
|
|
|
#include "putty.h"
|
|
#include "mpint.h"
|
|
#include "ssh.h"
|
|
#include "sshserver.h"
|
|
|
|
const char *const appname = "psusan";
|
|
|
|
void modalfatalbox(const char *p, ...)
|
|
{
|
|
va_list ap;
|
|
fprintf(stderr, "FATAL ERROR: ");
|
|
va_start(ap, p);
|
|
vfprintf(stderr, p, ap);
|
|
va_end(ap);
|
|
fputc('\n', stderr);
|
|
exit(1);
|
|
}
|
|
void nonfatal(const char *p, ...)
|
|
{
|
|
va_list ap;
|
|
fprintf(stderr, "ERROR: ");
|
|
va_start(ap, p);
|
|
vfprintf(stderr, p, ap);
|
|
va_end(ap);
|
|
fputc('\n', stderr);
|
|
}
|
|
|
|
char *platform_default_s(const char *name)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
bool platform_default_b(const char *name, bool def)
|
|
{
|
|
return def;
|
|
}
|
|
|
|
int platform_default_i(const char *name, int def)
|
|
{
|
|
return def;
|
|
}
|
|
|
|
FontSpec *platform_default_fontspec(const char *name)
|
|
{
|
|
return fontspec_new("");
|
|
}
|
|
|
|
Filename *platform_default_filename(const char *name)
|
|
{
|
|
return filename_from_str("");
|
|
}
|
|
|
|
char *x_get_default(const char *key)
|
|
{
|
|
return NULL; /* this is a stub */
|
|
}
|
|
|
|
void old_keyfile_warning(void) { }
|
|
|
|
void timer_change_notify(unsigned long next)
|
|
{
|
|
}
|
|
|
|
char *platform_get_x_display(void) { return NULL; }
|
|
|
|
static bool verbose;
|
|
|
|
struct server_instance {
|
|
unsigned id;
|
|
LogPolicy logpolicy;
|
|
};
|
|
|
|
static void log_to_stderr(unsigned id, const char *msg)
|
|
{
|
|
if (id != (unsigned)-1)
|
|
fprintf(stderr, "#%u: ", id);
|
|
fputs(msg, stderr);
|
|
fputc('\n', stderr);
|
|
fflush(stderr);
|
|
}
|
|
|
|
static void server_eventlog(LogPolicy *lp, const char *event)
|
|
{
|
|
struct server_instance *inst = container_of(
|
|
lp, struct server_instance, logpolicy);
|
|
if (verbose)
|
|
log_to_stderr(inst->id, event);
|
|
}
|
|
|
|
static void server_logging_error(LogPolicy *lp, const char *event)
|
|
{
|
|
struct server_instance *inst = container_of(
|
|
lp, struct server_instance, logpolicy);
|
|
log_to_stderr(inst->id, event); /* unconditional */
|
|
}
|
|
|
|
static int server_askappend(
|
|
LogPolicy *lp, Filename *filename,
|
|
void (*callback)(void *ctx, int result), void *ctx)
|
|
{
|
|
return 2; /* always overwrite (FIXME: could make this a cmdline option) */
|
|
}
|
|
|
|
static const LogPolicyVtable server_logpolicy_vt = {
|
|
server_eventlog,
|
|
server_askappend,
|
|
server_logging_error,
|
|
null_lp_verbose_no,
|
|
};
|
|
|
|
static void show_help(FILE *fp)
|
|
{
|
|
fputs("usage: psusan [options]\n"
|
|
"options: --sessiondir DIR cwd for session subprocess (default $HOME)\n"
|
|
" --sshlog FILE write ssh-connection packet log to FILE\n"
|
|
" --sshrawlog FILE write packets and raw data log to FILE\n"
|
|
"also: psusan --help show this text\n"
|
|
" psusan --version show version information\n", fp);
|
|
}
|
|
|
|
static void show_version_and_exit(void)
|
|
{
|
|
char *buildinfo_text = buildinfo("\n");
|
|
printf("%s: %s\n%s\n", appname, ver, buildinfo_text);
|
|
sfree(buildinfo_text);
|
|
exit(0);
|
|
}
|
|
|
|
const bool buildinfo_gtk_relevant = false;
|
|
|
|
static bool finished = false;
|
|
void server_instance_terminated(LogPolicy *lp)
|
|
{
|
|
struct server_instance *inst = container_of(
|
|
lp, struct server_instance, logpolicy);
|
|
|
|
finished = true;
|
|
|
|
sfree(inst);
|
|
}
|
|
|
|
static bool longoptarg(const char *arg, const char *expected,
|
|
const char **val, int *argcp, char ***argvp)
|
|
{
|
|
int len = strlen(expected);
|
|
if (memcmp(arg, expected, len))
|
|
return false;
|
|
if (arg[len] == '=') {
|
|
*val = arg + len + 1;
|
|
return true;
|
|
} else if (arg[len] == '\0') {
|
|
if (--*argcp > 0) {
|
|
*val = *++*argvp;
|
|
return true;
|
|
} else {
|
|
fprintf(stderr, "%s: option %s expects an argument\n",
|
|
appname, expected);
|
|
exit(1);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool longoptnoarg(const char *arg, const char *expected)
|
|
{
|
|
int len = strlen(expected);
|
|
if (memcmp(arg, expected, len))
|
|
return false;
|
|
if (arg[len] == '=') {
|
|
fprintf(stderr, "%s: option %s expects no argument\n",
|
|
appname, expected);
|
|
exit(1);
|
|
} else if (arg[len] == '\0') {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
struct server_config {
|
|
Conf *conf;
|
|
const SshServerConfig *ssc;
|
|
unsigned next_id;
|
|
};
|
|
|
|
static Plug *server_conn_plug(
|
|
struct server_config *cfg, struct server_instance **inst_out)
|
|
{
|
|
struct server_instance *inst = snew(struct server_instance);
|
|
|
|
memset(inst, 0, sizeof(*inst));
|
|
|
|
inst->id = cfg->next_id++;
|
|
inst->logpolicy.vt = &server_logpolicy_vt;
|
|
|
|
if (inst_out)
|
|
*inst_out = inst;
|
|
|
|
return ssh_server_plug(
|
|
cfg->conf, cfg->ssc, NULL, 0, NULL, NULL,
|
|
&inst->logpolicy, &unix_live_sftpserver_vt);
|
|
}
|
|
|
|
unsigned auth_methods(AuthPolicy *ap)
|
|
{ return 0; }
|
|
bool auth_none(AuthPolicy *ap, ptrlen username)
|
|
{ return false; }
|
|
int auth_password(AuthPolicy *ap, ptrlen username, ptrlen password,
|
|
ptrlen *new_password_opt)
|
|
{ return 0; }
|
|
bool auth_publickey(AuthPolicy *ap, ptrlen username, ptrlen public_blob)
|
|
{ return false; }
|
|
RSAKey *auth_publickey_ssh1(
|
|
AuthPolicy *ap, ptrlen username, mp_int *rsa_modulus)
|
|
{ return NULL; }
|
|
AuthKbdInt *auth_kbdint_prompts(AuthPolicy *ap, ptrlen username)
|
|
{ return NULL; }
|
|
int auth_kbdint_responses(AuthPolicy *ap, const ptrlen *responses)
|
|
{ return -1; }
|
|
char *auth_ssh1int_challenge(AuthPolicy *ap, unsigned method, ptrlen username)
|
|
{ return NULL; }
|
|
bool auth_ssh1int_response(AuthPolicy *ap, ptrlen response)
|
|
{ return false; }
|
|
bool auth_successful(AuthPolicy *ap, ptrlen username, unsigned method)
|
|
{ return false; }
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
SshServerConfig ssc;
|
|
|
|
Conf *conf = make_ssh_server_conf();
|
|
|
|
memset(&ssc, 0, sizeof(ssc));
|
|
|
|
ssc.session_starting_dir = getenv("HOME");
|
|
ssc.bare_connection = true;
|
|
|
|
while (--argc > 0) {
|
|
const char *arg = *++argv;
|
|
const char *val;
|
|
|
|
if (longoptnoarg(arg, "--help")) {
|
|
show_help(stdout);
|
|
exit(0);
|
|
} else if (longoptnoarg(arg, "--version")) {
|
|
show_version_and_exit();
|
|
} else if (longoptarg(arg, "--sessiondir", &val, &argc, &argv)) {
|
|
ssc.session_starting_dir = val;
|
|
} else if (longoptarg(arg, "--sshlog", &val, &argc, &argv) ||
|
|
longoptarg(arg, "-sshlog", &val, &argc, &argv)) {
|
|
Filename *logfile = filename_from_str(val);
|
|
conf_set_filename(conf, CONF_logfilename, logfile);
|
|
filename_free(logfile);
|
|
conf_set_int(conf, CONF_logtype, LGTYP_PACKETS);
|
|
conf_set_int(conf, CONF_logxfovr, LGXF_OVR);
|
|
} else if (longoptarg(arg, "--sshrawlog", &val, &argc, &argv) ||
|
|
longoptarg(arg, "-sshrawlog", &val, &argc, &argv)) {
|
|
Filename *logfile = filename_from_str(val);
|
|
conf_set_filename(conf, CONF_logfilename, logfile);
|
|
filename_free(logfile);
|
|
conf_set_int(conf, CONF_logtype, LGTYP_SSHRAW);
|
|
conf_set_int(conf, CONF_logxfovr, LGXF_OVR);
|
|
} else {
|
|
fprintf(stderr, "%s: unrecognised option '%s'\n", appname, arg);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
sk_init();
|
|
uxsel_init();
|
|
|
|
struct server_config scfg;
|
|
scfg.conf = conf;
|
|
scfg.ssc = &ssc;
|
|
scfg.next_id = 0;
|
|
|
|
struct server_instance *inst;
|
|
Plug *plug = server_conn_plug(&scfg, &inst);
|
|
ssh_server_start(plug, make_fd_socket(0, 1, -1, plug));
|
|
|
|
cli_main_loop(cliloop_no_pw_setup, cliloop_no_pw_check,
|
|
cliloop_always_continue, NULL);
|
|
|
|
return 0;
|
|
}
|