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xrdp/sesman/sesman.c

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/*
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.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2005
session manager
linux only
*/
#include "d3des.h"
#include "arch.h"
#include "parse.h"
#include "os_calls.h"
#include "sesman.h"
#include "config.h"
static int g_sck;
static int g_pid;
static unsigned char g_fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
static struct session_item g_session_items[100]; /* sesman.h */
static struct sesman_config g_cfg; /* config.h */
/*****************************************************************************/
static int DEFAULT_CC
tcp_force_recv(int sck, char* data, int len)
{
int rcvd;
while (len > 0)
{
rcvd = g_tcp_recv(sck, data, len, 0);
if (rcvd == -1)
{
if (g_tcp_last_error_would_block(sck))
{
g_sleep(1);
}
else
{
return 1;
}
}
else if (rcvd == 0)
{
return 1;
}
else
{
data += rcvd;
len -= rcvd;
}
}
return 0;
}
/*****************************************************************************/
static int DEFAULT_CC
tcp_force_send(int sck, char* data, int len)
{
int sent;
while (len > 0)
{
sent = g_tcp_send(sck, data, len, 0);
if (sent == -1)
{
if (g_tcp_last_error_would_block(sck))
{
g_sleep(1);
}
else
{
return 1;
}
}
else if (sent == 0)
{
return 1;
}
else
{
data += sent;
len -= sent;
}
}
return 0;
}
/******************************************************************************/
static struct session_item* DEFAULT_CC
find_session_item(char* name, int width, int height, int bpp)
{
int i;
for (i = 0; i < 100; i++)
{
if (g_strncmp(name, g_session_items[i].name, 255) == 0 &&
g_session_items[i].width == width &&
g_session_items[i].height == height &&
g_session_items[i].bpp == bpp)
{
return g_session_items + i;
}
}
return 0;
}
/******************************************************************************/
/* returns non zero if there is an xserver running on this display */
static int DEFAULT_CC
x_server_running(int display)
{
char text[256];
g_sprintf(text, "/tmp/.X11-unix/X%d", display);
return g_file_exist(text);
}
/******************************************************************************/
static void DEFAULT_CC
cterm(int s)
{
int i;
int pid;
if (g_getpid() != g_pid)
{
return;
}
pid = g_waitchild();
if (pid > 0)
{
for (i = 0; i < 100; i++)
{
if (g_session_items[i].pid == pid)
{
g_memset(g_session_items + i, 0, sizeof(struct session_item));
}
}
}
}
/******************************************************************************/
static int DEFAULT_CC
check_password_file(char* filename, char* password)
{
char encryptedPasswd[16];
int fd;
g_memset(encryptedPasswd, 0, 16);
g_strncpy(encryptedPasswd, password, 8);
rfbDesKey(g_fixedkey, 0);
rfbDes(encryptedPasswd, encryptedPasswd);
fd = g_file_open(filename);
if (fd == 0)
{
return 1;
}
g_file_write(fd, encryptedPasswd, 8);
g_file_close(fd);
g_set_file_rights(filename, 1, 1); /* set read and write flags */
return 0;
}
/******************************************************************************/
static int DEFAULT_CC
set_user(char* username, char* passwd_file, int display)
{
int error;
int pw_uid;
int pw_gid;
int uid;
char pw_shell[256];
char pw_dir[256];
char pw_gecos[256];
char text[256];
error = g_getuser_info(username, &pw_gid, &pw_uid, pw_shell, pw_dir,
pw_gecos);
if (error == 0)
{
error = g_setgid(pw_gid);
if (error == 0)
{
uid = pw_uid;
error = g_setuid(uid);
}
if (error == 0)
{
g_clearenv();
g_setenv("SHELL", pw_shell, 1);
g_setenv("PATH", "/bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin", 1);
g_setenv("USER", username, 1);
g_sprintf(text, "%d", uid);
g_setenv("UID", text, 1);
g_setenv("HOME", pw_dir, 1);
g_set_current_dir(pw_dir);
g_sprintf(text, ":%d.0", display);
g_setenv("DISPLAY", text, 1);
if (passwd_file != 0)
{
g_mkdir(".vnc");
g_sprintf(passwd_file, "%s/.vnc/sesman_passwd", pw_dir);
}
}
}
return error;
}
/******************************************************************************/
/* returns 0 if error else the display number the session was started on */
static int DEFAULT_CC
start_session(int width, int height, int bpp, char* username, char* password,
long data)
{
int display;
int pid;
int wmpid;
int xpid;
char geometry[32];
char depth[32];
char screen[32];
char cur_dir[256];
char text[256];
char passwd_file[256];
g_get_current_dir(cur_dir, 255);
display = 10;
while (x_server_running(display) && display < 50)
{
display++;
}
if (display >= 50)
{
return 0;
}
wmpid = 0;
pid = g_fork();
if (pid == -1)
{
}
else if (pid == 0) /* child */
{
g_unset_signals();
auth_start_session(data, display);
g_sprintf(geometry, "%dx%d", width, height);
g_sprintf(depth, "%d", bpp);
g_sprintf(screen, ":%d", display);
wmpid = g_fork();
if (wmpid == -1)
{
}
else if (wmpid == 0) /* child */
{
/* give X a bit to start */
g_sleep(1000);
set_user(username, 0, display);
if (x_server_running(display))
{
auth_set_env(data);
/* try to execute user window manager if enabled */
if (g_cfg.enable_user_wm)
{
g_sprintf(text,"%s/%s", g_getenv("HOME"), g_cfg.user_wm);
if (g_file_exist(text))
{
g_execlp3(text, g_cfg.user_wm, 0);
}
}
/* if we're here something happened to g_execlp3
so we try running the default window manager */
g_sprintf(text, "%s/%s", cur_dir, g_cfg.default_wm);
g_execlp3(text, g_cfg.default_wm, 0);
/* still a problem starting window manager just start xterm */
g_execlp3("xterm", "xterm", 0);
/* should not get here */
}
g_printf("error starting window manager\n");
g_exit(0);
}
else /* parent */
{
xpid = g_fork();
if (xpid == -1)
{
}
else if (xpid == 0) /* child */
{
set_user(username, passwd_file, display);
check_password_file(passwd_file, password);
g_execlp11("Xvnc", "Xvnc", screen, "-geometry", geometry,
"-depth", depth, "-bs", "-rfbauth", passwd_file, 0);
/* should not get here */
g_printf("error\n");
g_exit(0);
}
else /* parent */
{
g_waitpid(wmpid);
g_sigterm(xpid);
g_sigterm(wmpid);
g_sleep(1000);
auth_end(data);
g_exit(0);
}
}
}
else /* parent */
{
g_session_items[display].pid = pid;
g_strcpy(g_session_items[display].name, username);
g_session_items[display].display = display;
g_session_items[display].width = width;
g_session_items[display].height = height;
g_session_items[display].bpp = bpp;
g_session_items[display].data = data;
g_sleep(5000);
}
return display;
}
/******************************************************************************/
static void DEFAULT_CC
sesman_shutdown(int sig)
{
if (g_getpid() != g_pid)
{
return;
}
g_printf("shutting down\n\r");
g_printf("signal %d pid %d\n\r", sig, g_getpid());
g_tcp_close(g_sck);
}
/******************************************************************************/
void DEFAULT_CC
sesman_reload_cfg(int sig)
{
struct sesman_config cfg;
if (g_getpid() != g_pid)
{
return;
}
g_printf("sesman: received SIGHUP\n\r");
if (config_read(&cfg) != 0)
{
g_printf("sesman: error reading config. keeping old cfg.\n\r");
return;
}
g_cfg = cfg;
g_printf("sesman: configuration reloaded\n\r");
}
/******************************************************************************/
int DEFAULT_CC
main(int argc, char** argv)
{
int sck;
int in_sck;
int code;
int i;
int size;
int version;
int width;
int height;
int bpp;
int display;
int error;
struct stream* in_s;
struct stream* out_s;
char* username;
char* password;
char user[256];
char pass[256];
struct session_item* s_item;
long data;
if (0 != config_read(&g_cfg))
{
g_printf("sesman: error reading config. quitting.\n\r");
return 1;
}
g_memset(&g_session_items, 0, sizeof(g_session_items));
g_pid = g_getpid();
g_signal(1, sesman_reload_cfg); /* SIGHUP */
g_signal(2, sesman_shutdown); /* SIGINT */
g_signal(9, sesman_shutdown); /* SIGKILL */
g_signal(15, sesman_shutdown); /* SIGTERM */
g_signal_child_stop(cterm); /* SIGCHLD */
if (argc == 1)
{
g_printf("xrdp session manager v0.1\n");
g_printf("usage\n");
g_printf("sesman wait - wait for connection\n");
g_printf("sesman server username password width height bpp - \
start session\n");
}
else if (argc == 2 && g_strncmp(argv[1], "wait", 255) == 0)
{
make_stream(in_s);
init_stream(in_s, 8192);
make_stream(out_s);
init_stream(out_s, 8192);
g_printf("listening\n");
g_sck = g_tcp_socket();
g_tcp_set_non_blocking(g_sck);
error = g_tcp_bind(g_sck, g_cfg.listen_port);
if (error == 0)
{
error = g_tcp_listen(g_sck);
if (error == 0)
{
in_sck = g_tcp_accept(g_sck);
while (in_sck == -1 && g_tcp_last_error_would_block(g_sck))
{
g_sleep(1000);
in_sck = g_tcp_accept(g_sck);
}
while (in_sck > 0)
{
init_stream(in_s, 8192);
if (tcp_force_recv(in_sck, in_s->data, 8) == 0)
{
in_uint32_be(in_s, version);
in_uint32_be(in_s, size);
init_stream(in_s, 8192);
if (tcp_force_recv(in_sck, in_s->data, size - 8) == 0)
{
if (version == 0)
{
in_uint16_be(in_s, code);
if (code == 0) /* check username - password, start session */
{
in_uint16_be(in_s, i);
in_uint8a(in_s, user, i);
user[i] = 0;
in_uint16_be(in_s, i);
in_uint8a(in_s, pass, i);
pass[i] = 0;
in_uint16_be(in_s, width);
in_uint16_be(in_s, height);
in_uint16_be(in_s, bpp);
data = auth_userpass(user, pass);
display = 0;
if (data)
{
s_item = find_session_item(user, width, height, bpp);
if (s_item != 0)
{
display = s_item->display;
auth_end(data);
/* don't set data to null here */
}
else
{
display = start_session(width, height, bpp, user, pass,
data);
}
if (display == 0)
{
auth_end(data);
data = 0;
}
}
init_stream(out_s, 8192);
out_uint32_be(out_s, 0); /* version */
out_uint32_be(out_s, 14); /* size */
out_uint16_be(out_s, 3); /* cmd */
out_uint16_be(out_s, data != 0); /* data */
out_uint16_be(out_s, display); /* data */
s_mark_end(out_s);
tcp_force_send(in_sck, out_s->data,
out_s->end - out_s->data);
}
}
}
}
g_tcp_close(in_sck);
in_sck = g_tcp_accept(g_sck);
while (in_sck == -1 && g_tcp_last_error_would_block(g_sck))
{
g_sleep(1000);
in_sck = g_tcp_accept(g_sck);
}
}
}
else
{
g_printf("listen error\n");
}
}
else
{
g_printf("bind error\n");
}
g_tcp_close(g_sck);
free_stream(in_s);
free_stream(out_s);
}
else if (argc == 7)
{
username = argv[2];
password = argv[3];
width = g_atoi(argv[4]);
height = g_atoi(argv[5]);
bpp = g_atoi(argv[6]);
make_stream(in_s);
init_stream(in_s, 8192);
make_stream(out_s);
init_stream(out_s, 8192);
sck = g_tcp_socket();
if (g_tcp_connect(sck, argv[1], "3350") == 0)
{
s_push_layer(out_s, channel_hdr, 8);
out_uint16_be(out_s, 0); /* code */
i = g_strlen(username);
out_uint16_be(out_s, i);
out_uint8a(out_s, username, i);
i = g_strlen(password);
out_uint16_be(out_s, i);
out_uint8a(out_s, password, i);
out_uint16_be(out_s, width);
out_uint16_be(out_s, height);
out_uint16_be(out_s, bpp);
s_mark_end(out_s);
s_pop_layer(out_s, channel_hdr);
out_uint32_be(out_s, 0); /* version */
out_uint32_be(out_s, out_s->end - out_s->data); /* size */
tcp_force_send(sck, out_s->data, out_s->end - out_s->data);
if (tcp_force_recv(sck, in_s->data, 8) == 0)
{
in_uint32_be(in_s, version);
in_uint32_be(in_s, size);
init_stream(in_s, 8192);
if (tcp_force_recv(sck, in_s->data, size - 8) == 0)
{
if (version == 0)
{
in_uint16_be(in_s, code);
if (code == 3)
{
in_uint16_be(in_s, data);
in_uint16_be(in_s, display);
g_printf("ok %d display %d\n", data, display);
}
}
}
}
}
else
{
g_printf("connect error\n");
}
g_tcp_close(sck);
free_stream(in_s);
free_stream(out_s);
}
return 0;
}
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