1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <sys/socket.h>
33 #include <selinux/selinux.h>
34 #include <selinux/label.h>
36 static struct selabel_handle *label_hnd = NULL;
38 static int use_selinux_cached = -1;
40 static inline bool use_selinux(void) {
42 if (use_selinux_cached < 0)
43 use_selinux_cached = is_selinux_enabled() > 0;
45 return use_selinux_cached;
48 void label_retest_selinux(void) {
49 use_selinux_cached = -1;
54 int label_init(void) {
58 usec_t before_timestamp, after_timestamp;
59 struct mallinfo before_mallinfo, after_mallinfo;
67 before_mallinfo = mallinfo();
68 before_timestamp = now(CLOCK_MONOTONIC);
70 label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
72 log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
73 "Failed to initialize SELinux context: %m");
74 r = security_getenforce() == 1 ? -errno : 0;
76 char timespan[FORMAT_TIMESPAN_MAX];
79 after_timestamp = now(CLOCK_MONOTONIC);
80 after_mallinfo = mallinfo();
82 l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
84 log_info("Successfully loaded SELinux database in %s, size on heap is %iK.",
85 format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp),
93 int label_fix(const char *path, bool ignore_enoent) {
98 security_context_t fcon;
100 if (!use_selinux() || !label_hnd)
103 r = lstat(path, &st);
105 r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
107 /* If there's no label to set, then exit without warning */
108 if (r < 0 && errno == ENOENT)
112 r = setfilecon(path, fcon);
115 /* If the FS doesn't support labels, then exit without warning */
116 if (r < 0 && errno == ENOTSUP)
122 /* Ignore ENOENT in some cases */
123 if (ignore_enoent && errno == ENOENT)
126 log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
127 "Unable to fix label of %s: %m", path);
128 r = security_getenforce() == 1 ? -errno : 0;
135 void label_finish(void) {
138 if (use_selinux() && label_hnd)
139 selabel_close(label_hnd);
143 int label_get_create_label_from_exe(const char *exe, char **label) {
148 security_context_t mycon = NULL, fcon = NULL;
149 security_class_t sclass;
151 if (!use_selinux()) {
160 r = getfilecon(exe, &fcon);
164 sclass = string_to_security_class("process");
165 r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
167 log_debug("SELinux Socket context for %s will be set to %s", exe, *label);
170 if (r < 0 && security_getenforce() == 1)
180 int label_fifofile_set(const char *path) {
184 security_context_t filecon = NULL;
186 if (!use_selinux() || !label_hnd)
189 if ((r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFIFO)) == 0) {
190 if ((r = setfscreatecon(filecon)) < 0) {
191 log_error("Failed to set SELinux file context on %s: %m", path);
198 if (r < 0 && security_getenforce() == 0)
205 int label_symlinkfile_set(const char *path) {
209 security_context_t filecon = NULL;
211 if (!use_selinux() || !label_hnd)
214 if ((r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFLNK)) == 0) {
215 if ((r = setfscreatecon(filecon)) < 0) {
216 log_error("Failed to set SELinux file context on %s: %m", path);
223 if (r < 0 && security_getenforce() == 0)
230 int label_socket_set(const char *label) {
236 if (setsockcreatecon((security_context_t) label) < 0) {
237 log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
238 "Failed to set SELinux context (%s) on socket: %m", label);
240 if (security_getenforce() == 1)
248 void label_file_clear(void) {
254 setfscreatecon(NULL);
258 void label_socket_clear(void) {
264 setsockcreatecon(NULL);
268 void label_free(const char *label) {
274 freecon((security_context_t) label);
278 int label_mkdir(const char *path, mode_t mode) {
280 /* Creates a directory and labels it according to the SELinux policy */
284 security_context_t fcon = NULL;
286 if (!use_selinux() || label_hnd)
289 if (path_is_absolute(path))
290 r = selabel_lookup_raw(label_hnd, &fcon, path, mode);
294 newpath = path_make_absolute_cwd(path);
298 r = selabel_lookup_raw(label_hnd, &fcon, newpath, mode);
303 r = setfscreatecon(fcon);
305 if (r < 0 && errno != ENOENT) {
306 log_error("Failed to set security context %s for %s: %m", fcon, path);
308 if (security_getenforce() == 1) {
314 r = mkdir(path, mode);
319 setfscreatecon(NULL);
326 return mkdir(path, mode) < 0 ? -errno : 0;
329 int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
331 /* Binds a socket and label its file system object according to the SELinux policy */
335 security_context_t fcon = NULL;
336 const struct sockaddr_un *un;
341 assert(addrlen >= sizeof(sa_family_t));
343 if (!use_selinux() || !label_hnd)
346 /* Filter out non-local sockets */
347 if (addr->sa_family != AF_UNIX)
350 /* Filter out anonymous sockets */
351 if (addrlen < sizeof(sa_family_t) + 1)
354 /* Filter out abstract namespace sockets */
355 un = (const struct sockaddr_un*) addr;
356 if (un->sun_path[0] == 0)
359 path = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
363 if (path_is_absolute(path))
364 r = selabel_lookup_raw(label_hnd, &fcon, path, 0777);
368 newpath = path_make_absolute_cwd(path);
375 r = selabel_lookup_raw(label_hnd, &fcon, newpath, 0777);
380 r = setfscreatecon(fcon);
382 if (r < 0 && errno != ENOENT) {
383 log_error("Failed to set security context %s for %s: %m", fcon, path);
385 if (security_getenforce() == 1) {
391 r = bind(fd, addr, addrlen);
396 setfscreatecon(NULL);
404 return bind(fd, addr, addrlen) < 0 ? -errno : 0;