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