#include "config.h"
#include <libssh/libssh.h>
#include <libssh/server.h>
#include <libssh/callbacks.h>
#ifdef HAVE_ARGP_H
#include <argp.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#ifdef _WIN32
#include <io.h>
#endif
#ifndef BUF_SIZE
#define BUF_SIZE 2049
#endif
#ifndef KEYS_FOLDER
#ifdef _WIN32
#define KEYS_FOLDER
#else
#define KEYS_FOLDER "/etc/ssh/"
#endif
#endif
#define USER "myuser"
#define PASSWORD "mypassword"
static int authenticated=0;
static int tries = 0;
static int error = 0;
static ssh_channel chan=NULL;
static int auth_password(ssh_session session, const char *user,
const char *password, void *userdata){
(void)userdata;
printf("Authenticating user %s pwd %s\n",user, password);
if(strcmp(user,USER) == 0 && strcmp(password, PASSWORD) == 0){
authenticated = 1;
printf("Authenticated\n");
return SSH_AUTH_SUCCESS;
}
if (tries >= 3){
printf("Too many authentication tries\n");
ssh_disconnect(session);
error = 1;
return SSH_AUTH_DENIED;
}
tries++;
return SSH_AUTH_DENIED;
}
#ifdef WITH_GSSAPI
static int auth_gssapi_mic(ssh_session session, const char *user, const char *principal, void *userdata){
ssh_gssapi_creds creds = ssh_gssapi_get_creds(session);
(void)userdata;
printf("Authenticating user %s with gssapi principal %s\n",user, principal);
if (creds != NULL)
printf("Received some gssapi credentials\n");
else
printf("Not received any forwardable creds\n");
printf("authenticated\n");
authenticated = 1;
return SSH_AUTH_SUCCESS;
}
#endif
static int pty_request(ssh_session session, ssh_channel channel, const char *term,
int x,int y, int px, int py, void *userdata){
(void) session;
(void) channel;
(void) term;
(void) x;
(void) y;
(void) px;
(void) py;
(void) userdata;
printf("Allocated terminal\n");
return 0;
}
static int shell_request(ssh_session session, ssh_channel channel, void *userdata){
(void)session;
(void)channel;
(void)userdata;
printf("Allocated shell\n");
return 0;
}
struct ssh_channel_callbacks_struct channel_cb = {
.channel_pty_request_function = pty_request,
.channel_shell_request_function = shell_request
};
static ssh_channel new_session_channel(ssh_session session, void *userdata){
(void) session;
(void) userdata;
if(chan != NULL)
return NULL;
printf("Allocated session channel\n");
chan = ssh_channel_new(session);
ssh_callbacks_init(&channel_cb);
ssh_set_channel_callbacks(chan, &channel_cb);
return chan;
}
#ifdef HAVE_ARGP_H
const char *argp_program_version = "libssh server example "
SSH_STRINGIFY(LIBSSH_VERSION);
const char *argp_program_bug_address = "<libssh@libssh.org>";
static char doc[] = "libssh -- a Secure Shell protocol implementation";
static char args_doc[] = "BINDADDR";
static struct argp_option options[] = {
{
.name = "port",
.key = 'p',
.arg = "PORT",
.flags = 0,
.doc = "Set the port to bind.",
.group = 0
},
{
.name = "hostkey",
.key = 'k',
.arg = "FILE",
.flags = 0,
.doc = "Set the host key.",
.group = 0
},
{
.name = "dsakey",
.key = 'd',
.arg = "FILE",
.flags = 0,
.doc = "Set the dsa key.",
.group = 0
},
{
.name = "rsakey",
.key = 'r',
.arg = "FILE",
.flags = 0,
.doc = "Set the rsa key.",
.group = 0
},
{
.name = "verbose",
.key = 'v',
.arg = NULL,
.flags = 0,
.doc = "Get verbose output.",
.group = 0
},
{
.name = "config",
.key = 'f',
.arg = "FILE",
.flags = 0,
.doc = "Configuration file to use.",
.group = 0
},
{NULL, 0, NULL, 0, NULL, 0}
};
static error_t parse_opt (int key, char *arg, struct argp_state *state) {
ssh_bind sshbind = state->input;
switch (key) {
case 'p':
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDPORT_STR, arg);
break;
case 'd':
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_DSAKEY, arg);
break;
case 'k':
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_HOSTKEY, arg);
break;
case 'r':
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_RSAKEY, arg);
break;
case 'v':
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_LOG_VERBOSITY_STR, "3");
break;
case 'f':
ssh_bind_options_parse_config(sshbind, arg);
break;
case ARGP_KEY_ARG:
if (state->arg_num >= 1) {
argp_usage (state);
}
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_BINDADDR, arg);
break;
case ARGP_KEY_END:
if (state->arg_num < 1) {
argp_usage (state);
}
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static struct argp argp = {options, parse_opt, args_doc, doc, NULL, NULL, NULL};
#endif
int main(int argc, char **argv){
ssh_session session;
ssh_bind sshbind;
ssh_event mainloop;
struct ssh_server_callbacks_struct cb = {
.userdata = NULL,
.auth_password_function = auth_password,
#ifdef WITH_GSSAPI
.auth_gssapi_mic_function = auth_gssapi_mic,
#endif
.channel_open_request_session_function = new_session_channel
};
char buf[BUF_SIZE];
int i;
int r;
sshbind=ssh_bind_new();
session=ssh_new();
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_DSAKEY, KEYS_FOLDER "ssh_host_dsa_key");
ssh_bind_options_set(sshbind, SSH_BIND_OPTIONS_RSAKEY, KEYS_FOLDER "ssh_host_rsa_key");
#ifdef HAVE_ARGP_H
argp_parse (&argp, argc, argv, 0, 0, sshbind);
#else
(void) argc;
(void) argv;
#endif
if(ssh_bind_listen(sshbind)<0){
printf("Error listening to socket: %s\n",ssh_get_error(sshbind));
return 1;
}
r=ssh_bind_accept(sshbind,session);
if(r==SSH_ERROR){
printf("error accepting a connection : %s\n",ssh_get_error(sshbind));
return 1;
}
ssh_callbacks_init(&cb);
ssh_set_server_callbacks(session, &cb);
if (ssh_handle_key_exchange(session)) {
printf("ssh_handle_key_exchange: %s\n", ssh_get_error(session));
return 1;
}
ssh_set_auth_methods(session,SSH_AUTH_METHOD_PASSWORD | SSH_AUTH_METHOD_GSSAPI_MIC);
mainloop = ssh_event_new();
ssh_event_add_session(mainloop, session);
while (!(authenticated && chan != NULL)){
if(error)
break;
r = ssh_event_dopoll(mainloop, -1);
if (r == SSH_ERROR){
printf("Error : %s\n",ssh_get_error(session));
ssh_disconnect(session);
return 1;
}
}
if(error){
printf("Error, exiting loop\n");
} else
printf("Authenticated and got a channel\n");
do{
i=ssh_channel_read(chan, buf, sizeof(buf) - 1, 0);
if(i>0) {
if (ssh_channel_write(chan, buf, i) == SSH_ERROR) {
printf("error writing to channel\n");
return 1;
}
buf[i] = '\0';
printf("%s", buf);
fflush(stdout);
if (buf[0] == '\x0d') {
if (ssh_channel_write(chan, "\n", 1) == SSH_ERROR) {
printf("error writing to channel\n");
return 1;
}
printf("\n");
}
}
} while (i>0);
ssh_disconnect(session);
ssh_bind_free(sshbind);
ssh_finalize();
return 0;
}