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 Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
27 #include <selinux/context.h>
28 #include <selinux/label.h>
29 #include <selinux/selinux.h>
32 #include "alloc-util.h"
33 #include "path-util.h"
34 #include "selinux-util.h"
38 DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon);
39 DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
41 #define _cleanup_security_context_free_ _cleanup_(freeconp)
42 #define _cleanup_context_free_ _cleanup_(context_freep)
44 static int cached_use = -1;
45 static struct selabel_handle *label_hnd = NULL;
47 #define log_enforcing(...) log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, __VA_ARGS__)
50 bool mac_selinux_use(void) {
53 cached_use = is_selinux_enabled() > 0;
61 #if 0 /// UNNEEDED by elogind
62 void mac_selinux_retest(void) {
69 int mac_selinux_init(const char *prefix) {
73 usec_t before_timestamp, after_timestamp;
74 struct mallinfo before_mallinfo, after_mallinfo;
76 if (!mac_selinux_use())
82 before_mallinfo = mallinfo();
83 before_timestamp = now(CLOCK_MONOTONIC);
86 struct selinux_opt options[] = {
87 { .type = SELABEL_OPT_SUBSET, .value = prefix },
90 label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options));
92 label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
95 log_enforcing("Failed to initialize SELinux context: %m");
96 r = security_getenforce() == 1 ? -errno : 0;
98 char timespan[FORMAT_TIMESPAN_MAX];
101 after_timestamp = now(CLOCK_MONOTONIC);
102 after_mallinfo = mallinfo();
104 l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
106 log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.",
107 format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0),
115 #if 0 /// UNNEEDED by elogind
116 void mac_selinux_finish(void) {
122 selabel_close(label_hnd);
128 int mac_selinux_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
136 /* if mac_selinux_init() wasn't called before we are a NOOP */
140 r = lstat(path, &st);
142 _cleanup_security_context_free_ security_context_t fcon = NULL;
144 r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
146 /* If there's no label to set, then exit without warning */
147 if (r < 0 && errno == ENOENT)
151 r = lsetfilecon(path, fcon);
153 /* If the FS doesn't support labels, then exit without warning */
154 if (r < 0 && errno == EOPNOTSUPP)
160 /* Ignore ENOENT in some cases */
161 if (ignore_enoent && errno == ENOENT)
164 if (ignore_erofs && errno == EROFS)
167 log_enforcing("Unable to fix SELinux security context of %s: %m", path);
168 if (security_getenforce() == 1)
176 /// UNNEDED by elogind
178 int mac_selinux_apply(const char *path, const char *label) {
181 if (!mac_selinux_use())
187 if (setfilecon(path, (security_context_t) label) < 0) {
188 log_enforcing("Failed to set SELinux security context %s on path %s: %m", label, path);
189 if (security_getenforce() > 0)
196 int mac_selinux_get_create_label_from_exe(const char *exe, char **label) {
200 _cleanup_security_context_free_ security_context_t mycon = NULL, fcon = NULL;
201 security_class_t sclass;
206 if (!mac_selinux_use())
209 r = getcon_raw(&mycon);
213 r = getfilecon_raw(exe, &fcon);
217 sclass = string_to_security_class("process");
218 r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
226 int mac_selinux_get_our_label(char **label) {
232 if (!mac_selinux_use())
235 r = getcon_raw(label);
243 int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, const char *exec_label, char **label) {
247 _cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL;
248 _cleanup_context_free_ context_t pcon = NULL, bcon = NULL;
249 security_class_t sclass;
250 const char *range = NULL;
252 assert(socket_fd >= 0);
256 if (!mac_selinux_use())
259 r = getcon_raw(&mycon);
263 r = getpeercon(socket_fd, &peercon);
268 /* If there is no context set for next exec let's use context
269 of target executable */
270 r = getfilecon_raw(exe, &fcon);
275 bcon = context_new(mycon);
279 pcon = context_new(peercon);
283 range = context_range_get(pcon);
287 r = context_range_set(bcon, range);
292 mycon = strdup(context_str(bcon));
296 sclass = string_to_security_class("process");
297 r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
305 char* mac_selinux_free(char *label) {
311 if (!mac_selinux_use())
315 freecon((security_context_t) label);
322 int mac_selinux_create_file_prepare(const char *path, mode_t mode) {
325 _cleanup_security_context_free_ security_context_t filecon = NULL;
333 if (path_is_absolute(path))
334 r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
336 _cleanup_free_ char *newpath = NULL;
338 r = path_make_absolute_cwd(path, &newpath);
342 r = selabel_lookup_raw(label_hnd, &filecon, newpath, mode);
346 /* No context specified by the policy? Proceed without setting it. */
350 log_enforcing("Failed to determine SELinux security context for %s: %m", path);
352 if (setfscreatecon(filecon) >= 0)
353 return 0; /* Success! */
355 log_enforcing("Failed to set SELinux security context %s for %s: %m", filecon, path);
358 if (security_getenforce() > 0)
365 void mac_selinux_create_file_clear(void) {
370 if (!mac_selinux_use())
373 setfscreatecon(NULL);
377 #if 0 /// UNNEEDED by elogind
378 int mac_selinux_create_socket_prepare(const char *label) {
381 if (!mac_selinux_use())
386 if (setsockcreatecon((security_context_t) label) < 0) {
387 log_enforcing("Failed to set SELinux security context %s for sockets: %m", label);
389 if (security_getenforce() == 1)
397 void mac_selinux_create_socket_clear(void) {
402 if (!mac_selinux_use())
405 setsockcreatecon(NULL);
409 int mac_selinux_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
411 /* Binds a socket and label its file system object according to the SELinux policy */
414 _cleanup_security_context_free_ security_context_t fcon = NULL;
415 const struct sockaddr_un *un;
416 bool context_changed = false;
422 assert(addrlen >= sizeof(sa_family_t));
427 /* Filter out non-local sockets */
428 if (addr->sa_family != AF_UNIX)
431 /* Filter out anonymous sockets */
432 if (addrlen < offsetof(struct sockaddr_un, sun_path) + 1)
435 /* Filter out abstract namespace sockets */
436 un = (const struct sockaddr_un*) addr;
437 if (un->sun_path[0] == 0)
440 path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
442 if (path_is_absolute(path))
443 r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK);
445 _cleanup_free_ char *newpath = NULL;
447 r = path_make_absolute_cwd(path, &newpath);
451 r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK);
455 /* No context specified by the policy? Proceed without setting it */
459 log_enforcing("Failed to determine SELinux security context for %s: %m", path);
460 if (security_getenforce() > 0)
464 if (setfscreatecon(fcon) < 0) {
465 log_enforcing("Failed to set SELinux security context %s for %s: %m", fcon, path);
466 if (security_getenforce() > 0)
469 context_changed = true;
472 r = bind(fd, addr, addrlen) < 0 ? -errno : 0;
475 setfscreatecon(NULL);
481 if (bind(fd, addr, addrlen) < 0)