***/
#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>
+#include <selinux/context.h>
+#endif
#include "label.h"
+#include "strv.h"
#include "util.h"
#include "path-util.h"
-
-#ifdef HAVE_SELINUX
#include "selinux-util.h"
-#include <selinux/selinux.h>
-#include <selinux/label.h>
+#include "smack-util.h"
+#ifdef HAVE_SELINUX
static struct selabel_handle *label_hnd = NULL;
+#endif
+
+static int smack_relabel_in_dev(const char *path) {
+ int r = 0;
+
+#ifdef HAVE_SMACK
+ struct stat sb;
+ const char *label;
+ /*
+ * Path must be in /dev and must exist
+ */
+ if (!path_startswith(path, "/dev"))
+ return 0;
+
+ 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
+ return r;
+}
+
int label_init(const char *prefix) {
int r = 0;
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),
+ 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, bool ignore_erofs) {
+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);
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_get_child_label(int socket_fd, const char *exe, char **label) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+
+ security_context_t mycon = NULL, peercon = NULL, fcon = NULL, ret = NULL;
+ security_class_t sclass;
+ context_t pcon = NULL, bcon = NULL;
+ const char *range = NULL;
+
+ assert(socket_fd >= 0);
+ assert(exe);
+ assert(label);
+
+ r = getcon(&mycon);
+ if (r < 0)
+ goto out;
+
+ r = getpeercon(socket_fd, &peercon);
+ if (r < 0)
+ goto out;
+
+ r = getfilecon(exe, &fcon);
+ if (r < 0)
+ goto out;
+
+ bcon = context_new(mycon);
+ if (!bcon)
+ goto out;
+
+ pcon = context_new(peercon);
+ if (!pcon)
+ goto out;
+
+ range = context_range_get(pcon);
+ if (!range)
+ goto out;
+
+ r = context_range_set(bcon, range);
+ if (r)
+ goto out;
+
+ freecon(mycon);
+ mycon = context_str(bcon);
+ if (!mycon)
+ goto out;
+
+ sclass = string_to_security_class("process");
+ r = security_compute_create(mycon, fcon, sclass, &ret);
+ if (r < 0)
+ goto out;
+
+ *label = ret;
+
+out:
+ if (r && security_getenforce() == 1)
+ r = -errno;
+
+ freecon(mycon);
+ freecon(peercon);
+ freecon(fcon);
+ context_free(pcon);
+ context_free(bcon);
+
+#endif
+ return r;
+}
+
int label_context_set(const char *path, mode_t mode) {
int r = 0;
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, bool apply) {
+static int label_mkdir_selinux(const char *path, mode_t mode) {
+ int r = 0;
- /* Creates a directory and labels it according to the SELinux policy */
#ifdef HAVE_SELINUX
- int r;
+ /* Creates a directory and labels it according to the SELinux policy */
security_context_t fcon = NULL;
- if (!apply || !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