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xrdp/sesman/env.c

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2013
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*
* @file env.c
* @brief User environment handling code
* @author Jay Sorg
*
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include <grp.h>
#include "xrdp_sockets.h"
#include "list.h"
#include "sesman.h"
#include "ssl_calls.h"
#include "string_calls.h"
/******************************************************************************/
int
env_check_password_file(const char *filename, const char *passwd)
{
char encryptedPasswd[16];
char key[24];
char passwd_hash[20];
char passwd_hash_text[40];
int fd;
int passwd_bytes;
void *des;
void *sha1;
/* create password hash from password */
passwd_bytes = g_strlen(passwd);
sha1 = ssl_sha1_info_create();
ssl_sha1_clear(sha1);
ssl_sha1_transform(sha1, "xrdp_vnc", 8);
ssl_sha1_transform(sha1, passwd, passwd_bytes);
ssl_sha1_transform(sha1, passwd, passwd_bytes);
ssl_sha1_complete(sha1, passwd_hash);
ssl_sha1_info_delete(sha1);
g_snprintf(passwd_hash_text, 39, "%2.2x%2.2x%2.2x%2.2x",
(tui8)passwd_hash[0], (tui8)passwd_hash[1],
(tui8)passwd_hash[2], (tui8)passwd_hash[3]);
passwd_hash_text[39] = 0;
passwd = passwd_hash_text;
/* create file from password */
g_memset(encryptedPasswd, 0, sizeof(encryptedPasswd));
g_strncpy(encryptedPasswd, passwd, 8);
g_memset(key, 0, sizeof(key));
g_mirror_memcpy(key, g_fixedkey, 8);
des = ssl_des3_encrypt_info_create(key, 0);
ssl_des3_encrypt(des, 8, encryptedPasswd, encryptedPasswd);
ssl_des3_info_delete(des);
fd = g_file_open_ex(filename, 0, 1, 1, 1);
if (fd == -1)
{
LOG(LOG_LEVEL_WARNING,
"Cannot write VNC password hash to file %s: %s",
filename, g_get_strerror());
return 1;
}
g_file_write(fd, encryptedPasswd, 8);
g_file_close(fd);
return 0;
}
/******************************************************************************/
/* its the responsibility of the caller to free passwd_file */
int
env_set_user(const char *username, char **passwd_file, int display,
const struct list *env_names, const struct list *env_values)
{
int error;
int pw_uid;
int pw_gid;
int uid;
int index;
int len;
char *name;
char *value;
char *pw_shell;
char *pw_dir;
char text[256];
char hostname[256];
pw_shell = 0;
pw_dir = 0;
error = g_getuser_info(username, &pw_gid, &pw_uid, &pw_shell, &pw_dir, 0);
if (error == 0)
{
g_rm_temp_dir();
error = g_setgid(pw_gid);
if (error == 0)
{
error = g_initgroups(username, pw_gid);
}
if (error == 0)
{
uid = pw_uid;
error = g_setuid(uid);
}
g_mk_socket_path(0);
if (error == 0)
{
g_clearenv();
g_setenv("SHELL", pw_shell, 1);
g_setenv("PATH", "/sbin:/bin:/usr/bin:/usr/local/bin", 1);
g_setenv("USER", username, 1);
g_setenv("LOGNAME", 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);
g_setenv("XRDP_SESSION", "1", 1);
/* XRDP_SOCKET_PATH should be set even here. It's used by
* xorgxrdp and the pulseaudio plugin */
g_setenv("XRDP_SOCKET_PATH", XRDP_SOCKET_PATH, 1);
/* pulse sink socket */
g_snprintf(text, sizeof(text) - 1, CHANSRV_PORT_OUT_BASE_STR, display);
g_setenv("XRDP_PULSE_SINK_SOCKET", text, 1);
/* pulse source socket */
g_snprintf(text, sizeof(text) - 1, CHANSRV_PORT_IN_BASE_STR, display);
g_setenv("XRDP_PULSE_SOURCE_SOCKET", text, 1);
if ((env_names != 0) && (env_values != 0) &&
(env_names->count == env_values->count))
{
for (index = 0; index < env_names->count; index++)
{
name = (char *) list_get_item(env_names, index),
value = (char *) list_get_item(env_values, index),
g_setenv(name, value, 1);
}
}
g_gethostname(hostname, 255);
hostname[255] = 0;
if (passwd_file != 0)
{
if (0 == g_cfg->auth_file_path)
{
/* if no auth_file_path is set, then we go for
$HOME/.vnc/sesman_passwd-USERNAME@HOSTNAME:DISPLAY */
if (!g_directory_exist(".vnc"))
{
if (g_mkdir(".vnc") < 0)
{
LOG(LOG_LEVEL_ERROR,
"Error creating .vnc directory: %s",
g_get_strerror());
}
}
len = g_snprintf(NULL, 0, "%s/.vnc/sesman_passwd-%s@%s:%d",
pw_dir, username, hostname, display);
*passwd_file = (char *) g_malloc(len + 1, 1);
if (*passwd_file != NULL)
{
/* Try legacy names first, remove if found */
g_sprintf(*passwd_file, "%s/.vnc/sesman_%s_passwd:%d",
pw_dir, username, display);
if (g_file_exist(*passwd_file))
{
LOG(LOG_LEVEL_WARNING, "Removing old "
"password file %s", *passwd_file);
g_file_delete(*passwd_file);
}
g_sprintf(*passwd_file, "%s/.vnc/sesman_%s_passwd",
pw_dir, username);
if (g_file_exist(*passwd_file))
{
LOG(LOG_LEVEL_WARNING, "Removing insecure "
"password file %s", *passwd_file);
g_file_delete(*passwd_file);
}
g_sprintf(*passwd_file, "%s/.vnc/sesman_passwd-%s@%s:%d",
pw_dir, username, hostname, display);
}
}
else
{
/* we use auth_file_path as requested */
len = g_snprintf(NULL, 0, g_cfg->auth_file_path, username);
*passwd_file = (char *) g_malloc(len + 1, 1);
if (*passwd_file != NULL)
{
g_sprintf(*passwd_file, g_cfg->auth_file_path, username);
}
}
if (*passwd_file != NULL)
{
LOG_DEVEL(LOG_LEVEL_DEBUG, "pass file: %s", *passwd_file);
}
}
g_free(pw_dir);
g_free(pw_shell);
}
}
else
{
LOG(LOG_LEVEL_ERROR,
"error getting user info for user %s",
username);
}
return error;
}
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