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74a67d2d3f
xrdp/sesman/sesman.c
jsorg71 74a67d2d3f added non pam authentication
2005-06-04 23:51:51 +00:00

577 lines
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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 <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <signal.h>
#include <grp.h>
#include "d3des.h"
#include "arch.h"
#include "parse.h"
#include "os_calls.h"
int auth_userpass(char* user, char* pass);
static int g_sck;
static int g_pid;
struct session_item
{
char name[256];
int pid; // pid of sesman waiting for wm to end
int display;
int width;
int height;
int bpp;
};
static unsigned char s_fixedkey[8] = {23, 82, 107, 6, 35, 78, 88, 7};
static struct session_item session_items[100];
/*****************************************************************************/
int 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;
}
/*****************************************************************************/
int 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;
}
/******************************************************************************/
struct session_item* find_session_item(char* name, int width,
int height, int bpp)
{
int i;
for (i = 0; i < 100; i++)
{
if (g_strcmp(name, session_items[i].name) == 0 &&
session_items[i].width == width &&
session_items[i].height == height &&
session_items[i].bpp == bpp)
{
return session_items + i;
}
}
return 0;
}
/******************************************************************************/
struct session_item* find_session_item_by_name(char* name)
{
int i;
for (i = 0; i < 100; i++)
{
if (g_strcmp(name, session_items[i].name) == 0)
{
return session_items + i;
}
}
return 0;
}
/******************************************************************************/
struct session_item* find_session_item_by_display(int display)
{
int i;
for (i = 0; i < 100; i++)
{
if (session_items[i].display == display)
{
return session_items + i;
}
}
return 0;
}
/******************************************************************************/
int x_server_running(int display)
{
char text[256];
g_sprintf(text, "/tmp/.X11-unix/X%d", display);
return access(text, F_OK) == 0;
}
/******************************************************************************/
void cterm(int s)
{
int i;
int pid;
int wstat;
pid = waitpid(0, &wstat, WNOHANG);
if (pid > 0)
{
for (i = 0; i < 100; i++)
{
if (session_items[i].pid == pid)
{
g_memset(session_items + i, 0, sizeof(struct session_item));
}
}
}
}
/******************************************************************************/
/* ge the next available X display */
int get_next_display(void)
{
int i;
for (i = 10; i < 100; i++)
{
if (!x_server_running(i))
{
return i;
}
}
return -1;
}
/******************************************************************************/
int check_password_file(char* filename, char* password)
{
char encryptedPasswd[16];
int fd;
g_memset(encryptedPasswd, 0, 16);
g_strncpy(encryptedPasswd, password, 8);
rfbDesKey(s_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);
chmod(filename, S_IRUSR | S_IWUSR);
return 0;
}
/******************************************************************************/
int start_session(int width, int height, int bpp, char* username,
char* password)
{
int display;
int pid;
int uid;
int wmpid;
int xpid;
int error;
struct passwd* pwd_1;
char text[256];
char passwd_file[256];
char geometry[32];
char depth[32];
char screen[32];
char cur_dir[256];
getcwd(cur_dir, 255);
display = 10;
while (x_server_running(display) && display < 50)
{
display++;
}
if (display >= 50)
{
return 0;
}
wmpid = 0;
pid = fork();
if (pid == -1)
{
}
else if (pid == 0) // child
{
pwd_1 = getpwnam(username);
if (pwd_1 != 0)
{
/* set uid and groups */
error = initgroups(pwd_1->pw_name, pwd_1->pw_gid);
if (error == 0)
{
error = setgid(pwd_1->pw_gid);
}
if (error == 0)
{
uid = pwd_1->pw_uid;
error = setuid(uid);
}
if (error == 0)
{
clearenv();
setenv("SHELL", pwd_1->pw_shell, 1);
setenv("PATH", "/bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin", 1);
setenv("USER", username, 1);
g_sprintf(text, "%d", uid);
setenv("UID", text, 1);
setenv("HOME", pwd_1->pw_dir, 1);
chdir(pwd_1->pw_dir);
g_sprintf(text, ":%d.0", display);
setenv("DISPLAY", text, 1);
g_sprintf(geometry, "%dx%d", width, height);
g_sprintf(depth, "%d", bpp);
g_sprintf(screen, ":%d", display);
mkdir(".vnc", S_IRWXU);
g_sprintf(passwd_file, "%s/.vnc/sesman_passwd", pwd_1->pw_dir);
check_password_file(passwd_file, password);
wmpid = fork();
if (wmpid == -1)
{
}
else if (wmpid == 0) // child
{
// give X a bit to start
g_sleep(500);
if (x_server_running(display))
{
g_sprintf(text, "%s/startwm.sh", cur_dir);
execlp(text, "startwm.sh", NULL);
// should not get here
}
g_printf("error\n");
_exit(0);
}
else // parent
{
xpid = fork();
if (xpid == -1)
{
}
else if (xpid == 0) // child
{
execlp("Xvnc", "Xvnc", screen, "-geometry", geometry,
"-depth", depth, "-bs", "-rfbauth", passwd_file,
NULL);
// should not get here
g_printf("error\n");
_exit(0);
}
else // parent
{
waitpid(wmpid, 0, 0);
kill(xpid, SIGTERM);
kill(wmpid, SIGTERM);
_exit(0);
}
}
}
}
}
else // parent
{
signal(SIGCHLD, cterm);
session_items[display].pid = pid;
g_strcpy(session_items[display].name, username);
session_items[display].display = display;
session_items[display].width = width;
session_items[display].height = height;
session_items[display].bpp = bpp;
g_sleep(5000);
}
return display;
}
/******************************************************************************/
void sesman_shutdown(int sig)
{
if (getpid() != g_pid)
{
return;
}
g_printf("shutting down\n\r");
g_printf("signal %d pid %d\n\r", sig, getpid());
g_tcp_close(g_sck);
}
/******************************************************************************/
int main(int argc, char** argv)
{
int sck;
int in_sck;
int code;
int i;
int size;
int version;
int ok;
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;
signal(2, sesman_shutdown);
signal(9, sesman_shutdown);
signal(15, sesman_shutdown);
g_memset(&session_items, 0, sizeof(session_items));
g_pid = getpid();
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_strcmp(argv[1], "wait") == 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, "3350");
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;
//g_printf("%s\n", user);
in_uint16_be(in_s, i);
in_uint8a(in_s, pass, i);
pass[i] = 0;
//g_printf("%s\n", pass);
in_uint16_be(in_s, width);
in_uint16_be(in_s, height);
in_uint16_be(in_s, bpp);
//g_printf("%d %d %d\n", width, height, bpp);
ok = auth_userpass(user, pass);
display = 0;
if (ok)
{
s_item = find_session_item(user, width, height, bpp);
if (s_item != 0)
{
display = s_item->display;
}
else
{
display = start_session(width, height, bpp, user, pass);
}
if (display == 0)
{
ok = 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, ok); // 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 = atoi(argv[4]);
height = atoi(argv[5]);
bpp = 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);
//g_printf("%d\n", width);
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, ok);
in_uint16_be(in_s, display);
g_printf("ok %d display %d\n", ok, 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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