Copyright 2010 Lennart Poettering
systemd 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
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
-#include <sys/stat.h>
#include <unistd.h>
#include <malloc.h>
#include <sys/socket.h>
#include <sys/un.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/xattr.h>
+#ifdef HAVE_SELINUX
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+#endif
#include "label.h"
+#include "strv.h"
#include "util.h"
+#include "path-util.h"
+#include "selinux-util.h"
+#include "smack-util.h"
#ifdef HAVE_SELINUX
-#include <selinux/selinux.h>
-#include <selinux/label.h>
-
static struct selabel_handle *label_hnd = NULL;
+#endif
-static int use_selinux_cached = -1;
-
-static inline bool use_selinux(void) {
+static int smack_relabel_in_dev(const char *path) {
+ int r = 0;
- if (use_selinux_cached < 0)
- use_selinux_cached = is_selinux_enabled() > 0;
+#ifdef HAVE_SMACK
+ struct stat sb;
+ const char *label;
- return use_selinux_cached;
-}
+ /*
+ * Path must be in /dev and must exist
+ */
+ if (!path_startswith(path, "/dev"))
+ return 0;
-void label_retest_selinux(void) {
- use_selinux_cached = -1;
-}
+ r = lstat(path, &sb);
+ if (r < 0)
+ return -errno;
+
+ /*
+ * Label directories and character devices "*".
+ * Label symlinks "_".
+ * Don't change anything else.
+ */
+ if (S_ISDIR(sb.st_mode))
+ label = SMACK_STAR_LABEL;
+ else if (S_ISLNK(sb.st_mode))
+ label = SMACK_FLOOR_LABEL;
+ else if (S_ISCHR(sb.st_mode))
+ label = SMACK_STAR_LABEL;
+ else
+ return 0;
+ r = setxattr(path, "security.SMACK64", label, strlen(label), 0);
+ if (r < 0) {
+ log_error("Smack relabeling \"%s\" %m", path);
+ return -errno;
+ }
#endif
-int label_init(void) {
+ return r;
+}
+
+int label_init(const char *prefix) {
int r = 0;
#ifdef HAVE_SELINUX
before_mallinfo = mallinfo();
before_timestamp = now(CLOCK_MONOTONIC);
- label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+ if (prefix) {
+ struct selinux_opt options[] = {
+ { .type = SELABEL_OPT_SUBSET, .value = prefix },
+ };
+
+ label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options));
+ } else
+ label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+
if (!label_hnd) {
log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"Failed to initialize SELinux context: %m");
l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
- log_info("Successfully loaded SELinux database in %s, size on heap is %iK.",
- format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp),
- (l+1023)/1024);
+ log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.",
+ format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0),
+ (l+1023)/1024);
}
#endif
return r;
}
-int label_fix(const char *path, bool ignore_enoent) {
+static int label_fix_selinux(const char *path, bool ignore_enoent, bool ignore_erofs) {
int r = 0;
#ifdef HAVE_SELINUX
struct stat st;
security_context_t fcon;
- if (!use_selinux() || !label_hnd)
+ if (!label_hnd)
return 0;
r = lstat(path, &st);
if (ignore_enoent && errno == ENOENT)
return 0;
+ if (ignore_erofs && errno == EROFS)
+ return 0;
+
log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"Unable to fix label of %s: %m", path);
r = security_getenforce() == 1 ? -errno : 0;
return r;
}
+int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
+ int r = 0;
+
+ if (use_selinux()) {
+ r = label_fix_selinux(path, ignore_enoent, ignore_erofs);
+ if (r < 0)
+ return r;
+ }
+
+ if (use_smack()) {
+ r = smack_relabel_in_dev(path);
+ if (r < 0)
+ return r;
+ }
+
+ return r;
+}
+
void label_finish(void) {
#ifdef HAVE_SELINUX
- if (use_selinux() && label_hnd)
+ if (!use_selinux())
+ return;
+
+ if (label_hnd)
selabel_close(label_hnd);
#endif
}
return r;
}
-int label_fifofile_set(const char *path) {
- int r = 0;
-
-#ifdef HAVE_SELINUX
- security_context_t filecon = NULL;
-
- if (!use_selinux() || !label_hnd)
- return 0;
-
- r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFIFO);
- if (r < 0)
- r = -errno;
- else if (r == 0) {
- r = setfscreatecon(filecon);
- if (r < 0) {
- log_error("Failed to set SELinux file context on %s: %m", path);
- r = -errno;
- }
-
- freecon(filecon);
- }
-
- if (r < 0 && security_getenforce() == 0)
- r = 0;
-#endif
-
- return r;
-}
-
-int label_symlinkfile_set(const char *path) {
+int label_context_set(const char *path, mode_t mode) {
int r = 0;
#ifdef HAVE_SELINUX
if (!use_selinux() || !label_hnd)
return 0;
- r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFLNK);
- if (r < 0)
+ r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
+ if (r < 0 && errno != ENOENT)
r = -errno;
else if (r == 0) {
r = setfscreatecon(filecon);
return 0;
}
-void label_file_clear(void) {
+void label_context_clear(void) {
#ifdef HAVE_SELINUX
+ PROTECT_ERRNO;
+
if (!use_selinux())
return;
void label_socket_clear(void) {
#ifdef HAVE_SELINUX
+ PROTECT_ERRNO;
+
if (!use_selinux())
return;
#endif
}
-int label_mkdir(const char *path, mode_t mode) {
-
- /* Creates a directory and labels it according to the SELinux policy */
+static int label_mkdir_selinux(const char *path, mode_t mode) {
+ int r = 0;
#ifdef HAVE_SELINUX
- int r;
+ /* Creates a directory and labels it according to the SELinux policy */
security_context_t fcon = NULL;
- if (!use_selinux() || !label_hnd)
- goto skipped;
+ if (!label_hnd)
+ return 0;
if (path_is_absolute(path))
r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR);
else {
- char *newpath;
+ _cleanup_free_ char *newpath;
newpath = path_make_absolute_cwd(path);
if (!newpath)
return -ENOMEM;
r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR);
- free(newpath);
}
if (r == 0)
finish:
setfscreatecon(NULL);
freecon(fcon);
+#endif
return r;
+}
-skipped:
-#endif
- return mkdir(path, mode) < 0 ? -errno : 0;
+int label_mkdir(const char *path, mode_t mode) {
+ int r;
+
+ if (use_selinux()) {
+ r = label_mkdir_selinux(path, mode);
+ if (r < 0)
+ return r;
+ }
+
+ if (use_smack()) {
+ r = mkdir(path, mode);
+ if (r < 0 && errno != EEXIST)
+ return -errno;
+
+ r = smack_relabel_in_dev(path);
+ if (r < 0)
+ return r;
+ }
+
+ r = mkdir(path, mode);
+ if (r < 0 && errno != EEXIST)
+ return -errno;
+
+ return 0;
}
int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
/* Binds a socket and label its file system object according to the SELinux policy */
#ifdef HAVE_SELINUX
- int r;
security_context_t fcon = NULL;
const struct sockaddr_un *un;
- char *path = NULL;
+ char *path;
+ int r;
assert(fd >= 0);
assert(addr);
if (un->sun_path[0] == 0)
goto skipped;
- path = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
- if (!path)
- return -ENOMEM;
+ path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
if (path_is_absolute(path))
r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK);
else {
- char *newpath;
+ _cleanup_free_ char *newpath;
newpath = path_make_absolute_cwd(path);
-
- if (!newpath) {
- free(path);
+ if (!newpath)
return -ENOMEM;
- }
r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK);
- free(newpath);
}
if (r == 0)
finish:
setfscreatecon(NULL);
freecon(fcon);
- free(path);
return r;
#endif
return bind(fd, addr, addrlen) < 0 ? -errno : 0;
}
+
+int label_apply(const char *path, const char *label) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+ if (!use_selinux())
+ return 0;
+
+ r = setfilecon(path, (char *)label);
+#endif
+ return r;
+}
~ianmdlvl / elogind.git / blobdiff