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
|
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2006 William Jon McCann <mccann@jhu.edu>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#ifdef __linux__
#include <linux/kd.h>
#endif
#ifdef HAVE_GETPEERUCRED
#include <ucred.h>
#endif
#include "ck-sysdeps.h"
/* Adapted from dbus-sysdeps-unix.c:_dbus_read_credentials_socket() */
gboolean
ck_get_socket_peer_credentials (int socket_fd,
pid_t *pid,
uid_t *uid,
GError **error)
{
gboolean ret;
uid_t uid_read;
pid_t pid_read;
pid_read = -1;
uid_read = -1;
ret = FALSE;
#ifdef SO_PEERCRED
struct ucred cr;
socklen_t cr_len;
cr_len = sizeof (cr);
if (getsockopt (socket_fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) == 0 && cr_len == sizeof (cr)) {
pid_read = cr.pid;
uid_read = cr.uid;
ret = TRUE;
} else {
g_warning ("Failed to getsockopt() credentials, returned len %d/%d: %s\n",
cr_len,
(int) sizeof (cr),
g_strerror (errno));
}
#elif defined(HAVE_GETPEERUCRED)
ucred_t *ucred;
ucred = NULL;
if (getpeerucred (socket_fd, &ucred) == 0) {
pid_read = ucred_getpid (ucred);
uid_read = ucred_geteuid (ucred);
ret = TRUE;
} else {
g_warning ("Failed to getpeerucred() credentials: %s\n",
g_strerror (errno));
}
if (ucred != NULL) {
ucred_free (ucred);
}
#else /* !SO_PEERCRED && !HAVE_GETPEERUCRED */
g_warning ("Socket credentials not supported on this OS\n");
#endif
if (pid != NULL) {
*pid = pid_read;
}
if (uid != NULL) {
*uid = uid_read;
}
return ret;
}
/*
* getfd.c
*
* Get an fd for use with kbd/console ioctls.
* We try several things because opening /dev/console will fail
* if someone else used X (which does a chown on /dev/console).
*/
gboolean
ck_fd_is_a_console (int fd)
{
char arg;
int kb_ok;
arg = 0;
#ifdef __linux__
kb_ok = (ioctl (fd, KDGKBTYPE, &arg) == 0
&& ((arg == KB_101) || (arg == KB_84)));
#else
kb_ok = 1;
#endif
return (isatty (fd) && kb_ok);
}
static int
open_a_console (char *fnam)
{
int fd;
fd = open (fnam, O_RDONLY | O_NOCTTY);
if (fd < 0 && errno == EACCES)
fd = open (fnam, O_WRONLY | O_NOCTTY);
if (fd < 0)
return -1;
if (! ck_fd_is_a_console (fd)) {
close (fd);
fd = -1;
}
return fd;
}
int
ck_get_a_console_fd (void)
{
int fd;
#ifdef _PATH_TTY
fd = open_a_console (_PATH_TTY);
if (fd >= 0)
return fd;
#endif
fd = open_a_console ("/dev/tty");
if (fd >= 0)
return fd;
#ifdef _PATH_CONSOLE
fd = open_a_console (_PATH_CONSOLE);
if (fd >= 0)
return fd;
#endif
fd = open_a_console ("/dev/console");
if (fd >= 0)
return fd;
for (fd = 0; fd < 3; fd++) {
if (ck_fd_is_a_console (fd)) {
return fd;
}
}
return -1;
}
gboolean
ck_is_root_user (void)
{
#ifndef G_OS_WIN32
uid_t ruid, euid, suid; /* Real, effective and saved user ID's */
gid_t rgid, egid, sgid; /* Real, effective and saved group ID's */
#ifdef HAVE_GETRESUID
if (getresuid (&ruid, &euid, &suid) != 0 ||
getresgid (&rgid, &egid, &sgid) != 0)
#endif /* HAVE_GETRESUID */
{
suid = ruid = getuid ();
sgid = rgid = getgid ();
euid = geteuid ();
egid = getegid ();
}
if (ruid == 0) {
return TRUE;
}
#endif
return FALSE;
}
|
