1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/**
* 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 "list.h"
#include "sesman.h"
#include "ssl_calls.h"
extern unsigned char g_fixedkey[8]; /* in sesman.c */
extern struct config_sesman *g_cfg; /* in sesman.c */
/******************************************************************************/
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_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_message(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];
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_temp_dir(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_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);
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);
}
}
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_username_passwd:DISPLAY */
if (!g_directory_exist(".vnc"))
{
if (g_mkdir(".vnc") < 0)
{
log_message(LOG_LEVEL_ERROR,
"Error creating .vnc directory: %s",
g_get_strerror());
}
}
len = g_snprintf(NULL, 0, "%s/.vnc/sesman_%s_passwd:%d",
pw_dir, username, display);
*passwd_file = (char *) g_malloc(len + 1, 1);
if (*passwd_file != NULL)
{
/* Try legacy name first, remove if found */
g_sprintf(*passwd_file, "%s/.vnc/sesman_%s_passwd",
pw_dir, username);
if (g_file_exist(*passwd_file))
{
log_message(LOG_LEVEL_WARNING, "Removing insecure "
"password file %s", *passwd_file);
g_file_delete(*passwd_file);
}
g_sprintf(*passwd_file, "%s/.vnc/sesman_%s_passwd:%d",
pw_dir, username, 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_DBG("pass file: %s", *passwd_file);
}
}
g_free(pw_dir);
g_free(pw_shell);
}
}
else
{
log_message(LOG_LEVEL_ERROR,
"error getting user info for user %s",
username);
}
return error;
}
|
