along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <errno.h>
+#include <unistd.h>
+#include <malloc.h>
+#include <sys/un.h>
+#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
+#include <selinux/label.h>
+#include <selinux/context.h>
+#endif
+#include "strv.h"
+#include "path-util.h"
#include "selinux-util.h"
-static int use_selinux_cached = -1;
+#ifdef HAVE_SELINUX
+DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon);
+DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
-bool use_selinux(void) {
+#define _cleanup_security_context_free_ _cleanup_(freeconp)
+#define _cleanup_context_free_ _cleanup_(context_freep)
- if (use_selinux_cached < 0)
- use_selinux_cached = is_selinux_enabled() > 0;
+static int cached_use = -1;
+static struct selabel_handle *label_hnd = NULL;
+#endif
- return use_selinux_cached;
+bool mac_selinux_use(void) {
+#ifdef HAVE_SELINUX
+ if (cached_use < 0)
+ cached_use = is_selinux_enabled() > 0;
+
+ return cached_use;
+#else
+ return false;
+#endif
+}
+
+void mac_selinux_retest(void) {
+#ifdef HAVE_SELINUX
+ cached_use = -1;
+#endif
+}
+
+int mac_selinux_init(const char *prefix) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+ usec_t before_timestamp, after_timestamp;
+ struct mallinfo before_mallinfo, after_mallinfo;
+
+ if (!mac_selinux_use())
+ return 0;
+
+ if (label_hnd)
+ return 0;
+
+ before_mallinfo = mallinfo();
+ before_timestamp = now(CLOCK_MONOTONIC);
+
+ 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");
+ r = security_getenforce() == 1 ? -errno : 0;
+ } else {
+ char timespan[FORMAT_TIMESPAN_MAX];
+ int l;
+
+ after_timestamp = now(CLOCK_MONOTONIC);
+ after_mallinfo = mallinfo();
+
+ l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
+
+ 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 mac_selinux_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+ struct stat st;
+
+ assert(path);
+
+ /* if mac_selinux_init() wasn't called before we are a NOOP */
+ if (!label_hnd)
+ return 0;
+
+ r = lstat(path, &st);
+ if (r >= 0) {
+ _cleanup_security_context_free_ security_context_t fcon = NULL;
+
+ r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
+
+ /* If there's no label to set, then exit without warning */
+ if (r < 0 && errno == ENOENT)
+ return 0;
+
+ if (r >= 0) {
+ r = lsetfilecon(path, fcon);
+
+ /* If the FS doesn't support labels, then exit without warning */
+ if (r < 0 && errno == ENOTSUP)
+ return 0;
+ }
+ }
+
+ if (r < 0) {
+ /* Ignore ENOENT in some cases */
+ 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 SELinux label of %s: %m", path);
+ r = security_getenforce() == 1 ? -errno : 0;
+ }
+#endif
+
+ return r;
+}
+
+void mac_selinux_finish(void) {
+
+#ifdef HAVE_SELINUX
+ if (!label_hnd)
+ return;
+
+ selabel_close(label_hnd);
+#endif
+}
+
+int mac_selinux_get_create_label_from_exe(const char *exe, char **label) {
+ int r = -EOPNOTSUPP;
+
+#ifdef HAVE_SELINUX
+ _cleanup_security_context_free_ security_context_t mycon = NULL, fcon = NULL;
+ security_class_t sclass;
+
+ assert(exe);
+ assert(label);
+
+ if (!mac_selinux_use())
+ return -EOPNOTSUPP;
+
+ r = getcon(&mycon);
+ if (r < 0)
+ return -errno;
+
+ r = getfilecon(exe, &fcon);
+ if (r < 0)
+ return -errno;
+
+ sclass = string_to_security_class("process");
+ r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
+ if (r < 0)
+ return -errno;
+#endif
+
+ return r;
+}
+
+int mac_selinux_get_our_label(char **label) {
+ int r = -EOPNOTSUPP;
+
+ assert(label);
+
+#ifdef HAVE_SELINUX
+ if (!mac_selinux_use())
+ return -EOPNOTSUPP;
+
+ r = getcon(label);
+ if (r < 0)
+ return -errno;
+#endif
+
+ return r;
+}
+
+int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, char **label) {
+ int r = -EOPNOTSUPP;
+
+#ifdef HAVE_SELINUX
+ _cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL;
+ _cleanup_context_free_ context_t pcon = NULL, bcon = NULL;
+ security_class_t sclass;
+ const char *range = NULL;
+
+ assert(socket_fd >= 0);
+ assert(exe);
+ assert(label);
+
+ if (!mac_selinux_use())
+ return -EOPNOTSUPP;
+
+ r = getcon(&mycon);
+ if (r < 0)
+ return -errno;
+
+ r = getpeercon(socket_fd, &peercon);
+ if (r < 0)
+ return -errno;
+
+ r = getexeccon(&fcon);
+ if (r < 0)
+ return -errno;
+
+ if (!fcon) {
+ /* If there is no context set for next exec let's use context
+ of target executable */
+ r = getfilecon(exe, &fcon);
+ if (r < 0)
+ return -errno;
+ }
+
+ bcon = context_new(mycon);
+ if (!bcon)
+ return -ENOMEM;
+
+ pcon = context_new(peercon);
+ if (!pcon)
+ return -ENOMEM;
+
+ range = context_range_get(pcon);
+ if (!range)
+ return -errno;
+
+ r = context_range_set(bcon, range);
+ if (r)
+ return -errno;
+
+ freecon(mycon);
+ mycon = strdup(context_str(bcon));
+ if (!mycon)
+ return -ENOMEM;
+
+ sclass = string_to_security_class("process");
+ r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
+ if (r < 0)
+ return -errno;
+#endif
+
+ return r;
+}
+
+int mac_selinux_context_set(const char *path, mode_t mode) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+ _cleanup_security_context_free_ security_context_t filecon = NULL;
+
+ if (!mac_selinux_use() || !label_hnd)
+ return 0;
+
+ r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
+ if (r < 0 && errno != ENOENT)
+ 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;
+ }
+ }
+
+ if (r < 0 && security_getenforce() == 0)
+ r = 0;
+#endif
+
+ return r;
+}
+
+int mac_selinux_socket_set(const char *label) {
+
+#ifdef HAVE_SELINUX
+ if (!mac_selinux_use())
+ return 0;
+
+ if (setsockcreatecon((security_context_t) label) < 0) {
+ log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
+ "Failed to set SELinux context (%s) on socket: %m", label);
+
+ if (security_getenforce() == 1)
+ return -errno;
+ }
+#endif
+
+ return 0;
+}
+
+void mac_selinux_context_clear(void) {
+
+#ifdef HAVE_SELINUX
+ PROTECT_ERRNO;
+
+ if (!mac_selinux_use())
+ return;
+
+ setfscreatecon(NULL);
+#endif
+}
+
+void mac_selinux_socket_clear(void) {
+
+#ifdef HAVE_SELINUX
+ PROTECT_ERRNO;
+
+ if (!mac_selinux_use())
+ return;
+
+ setsockcreatecon(NULL);
+#endif
+}
+
+void mac_selinux_free(const char *label) {
+
+#ifdef HAVE_SELINUX
+ if (!mac_selinux_use())
+ return;
+
+ freecon((security_context_t) label);
+#endif
}
-void retest_selinux(void) {
- use_selinux_cached = -1;
+int mac_selinux_mkdir(const char *path, mode_t mode) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+ /* Creates a directory and labels it according to the SELinux policy */
+ _cleanup_security_context_free_ security_context_t fcon = NULL;
+
+ if (!label_hnd)
+ return 0;
+
+ if (path_is_absolute(path))
+ r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR);
+ else {
+ _cleanup_free_ char *newpath;
+
+ newpath = path_make_absolute_cwd(path);
+ if (!newpath)
+ return -ENOMEM;
+
+ r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR);
+ }
+
+ if (r == 0)
+ r = setfscreatecon(fcon);
+
+ if (r < 0 && errno != ENOENT) {
+ log_error("Failed to set security context %s for %s: %m", fcon, path);
+
+ if (security_getenforce() == 1) {
+ r = -errno;
+ goto finish;
+ }
+ }
+
+ r = mkdir(path, mode);
+ if (r < 0)
+ r = -errno;
+
+finish:
+ setfscreatecon(NULL);
+#endif
+
+ return r;
+}
+
+int mac_selinux_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
+ _cleanup_security_context_free_ security_context_t fcon = NULL;
+ const struct sockaddr_un *un;
+ char *path;
+ int r;
+
+ assert(fd >= 0);
+ assert(addr);
+ assert(addrlen >= sizeof(sa_family_t));
+
+ if (!mac_selinux_use() || !label_hnd)
+ goto skipped;
+
+ /* Filter out non-local sockets */
+ if (addr->sa_family != AF_UNIX)
+ goto skipped;
+
+ /* Filter out anonymous sockets */
+ if (addrlen < sizeof(sa_family_t) + 1)
+ goto skipped;
+
+ /* Filter out abstract namespace sockets */
+ un = (const struct sockaddr_un*) addr;
+ if (un->sun_path[0] == 0)
+ goto skipped;
+
+ 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 {
+ _cleanup_free_ char *newpath;
+
+ newpath = path_make_absolute_cwd(path);
+ if (!newpath)
+ return -ENOMEM;
+
+ r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK);
+ }
+
+ if (r == 0)
+ r = setfscreatecon(fcon);
+
+ if (r < 0 && errno != ENOENT) {
+ log_error("Failed to set security context %s for %s: %m", fcon, path);
+
+ if (security_getenforce() == 1) {
+ r = -errno;
+ goto finish;
+ }
+ }
+
+ r = bind(fd, addr, addrlen);
+ if (r < 0)
+ r = -errno;
+
+finish:
+ setfscreatecon(NULL);
+ return r;
+
+skipped:
+#endif
+ return bind(fd, addr, addrlen) < 0 ? -errno : 0;
+}
+
+int mac_selinux_apply(const char *path, const char *label) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+ if (!mac_selinux_use())
+ return 0;
+
+ r = setfilecon(path, (char *)label);
+#endif
+ return r;
}
~ianmdlvl / elogind.git / blobdiff