#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"
+#include "selinux-util.h"
+#include "smack-util.h"
#ifdef HAVE_SELINUX
-#include "selinux-util.h"
-#include <selinux/selinux.h>
-#include <selinux/label.h>
+DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon);
+DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
-static struct selabel_handle *label_hnd = NULL;
+#define _cleanup_security_context_free_ _cleanup_(freeconp)
+#define _cleanup_context_free_ _cleanup_(context_freep)
+static struct selabel_handle *label_hnd = NULL;
#endif
-#ifdef HAVE_SMACK
-#include <sys/xattr.h>
-#include <string.h>
-#define FLOOR_LABEL "_"
-#define STAR_LABEL "*"
-static void smack_relabel_in_dev(const char *path) {
+static int smack_relabel_in_dev(const char *path) {
+ int r = 0;
+
+#ifdef HAVE_SMACK
struct stat sb;
const char *label;
- int r;
/*
* Path must be in /dev and must exist
*/
- if (!path_equal(path, "/dev") &&
- !path_startswith(path, "/dev"))
- return;
+ if (!path_startswith(path, "/dev"))
+ return 0;
r = lstat(path, &sb);
if (r < 0)
- return;
+ return -errno;
/*
* Label directories and character devices "*".
* Don't change anything else.
*/
if (S_ISDIR(sb.st_mode))
- label = STAR_LABEL;
+ label = SMACK_STAR_LABEL;
else if (S_ISLNK(sb.st_mode))
- label = FLOOR_LABEL;
+ label = SMACK_FLOOR_LABEL;
else if (S_ISCHR(sb.st_mode))
- label = STAR_LABEL;
+ label = SMACK_STAR_LABEL;
else
- return;
+ return 0;
r = setxattr(path, "security.SMACK64", label, strlen(label), 0);
- if (r < 0)
- log_error("Smack relabeling \"%s\" %s", path, strerror(errno));
- return;
-}
+ if (r < 0) {
+ log_error("Smack relabeling \"%s\" %m", path);
+ return -errno;
+ }
#endif
+ return r;
+}
+
int label_init(const char *prefix) {
int r = 0;
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);
r = security_getenforce() == 1 ? -errno : 0;
}
#endif
-#ifdef HAVE_SMACK
- smack_relabel_in_dev(path);
-#endif
+
+ 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;
}
return r;
}
+int label_get_our_label(char **label) {
+ int r = -EOPNOTSUPP;
+
+#ifdef HAVE_SELINUX
+ char *l = NULL;
+
+ r = getcon(&l);
+ if (r < 0)
+ return r;
+
+ *label = l;
+#endif
+
+ return r;
+}
+
+int label_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, ret = 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);
+
+ r = getcon(&mycon);
+ if (r < 0) {
+ r = -EINVAL;
+ goto out;
+ }
+
+ r = getpeercon(socket_fd, &peercon);
+ if (r < 0) {
+ r = -EINVAL;
+ goto out;
+ }
+
+ r = getexeccon(&fcon);
+ if (r < 0) {
+ r = -EINVAL;
+ goto out;
+ }
+
+ 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) {
+ r = -errno;
+ goto out;
+ }
+ }
+
+ bcon = context_new(mycon);
+ if (!bcon) {
+ r = -ENOMEM;
+ goto out;
+ }
+
+ pcon = context_new(peercon);
+ if (!pcon) {
+ r = -ENOMEM;
+ goto out;
+ }
+
+ range = context_range_get(pcon);
+ if (!range) {
+ r = -errno;
+ goto out;
+ }
+
+ r = context_range_set(bcon, range);
+ if (r) {
+ r = -errno;
+ goto out;
+ }
+
+ freecon(mycon);
+ mycon = context_str(bcon);
+ if (!mycon) {
+ r = -errno;
+ goto out;
+ }
+
+ sclass = string_to_security_class("process");
+ r = security_compute_create(mycon, fcon, sclass, &ret);
+ if (r < 0) {
+ r = -EINVAL;
+ goto out;
+ }
+
+ *label = ret;
+ r = 0;
+
+out:
+ if (r < 0 && security_getenforce() == 1)
+ return r;
+#endif
+ return r;
+}
+
int label_context_set(const char *path, mode_t mode) {
int r = 0;
if (r < 0 && security_getenforce() == 0)
r = 0;
#endif
-#ifdef HAVE_SMACK
- smack_relabel_in_dev(path);
-#endif
return r;
}
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) {
- int r;
+static int label_mkdir_selinux(const char *path, mode_t mode) {
+ int r = 0;
#ifdef HAVE_SELINUX
/* 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);
finish:
setfscreatecon(NULL);
freecon(fcon);
+#endif
return r;
+}
+
+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;
+ }
-skipped:
-#endif
r = mkdir(path, mode);
- if (r)
+ if (r < 0 && errno != EEXIST)
return -errno;
-#ifdef HAVE_SMACK
- smack_relabel_in_dev(path);
-#endif
+
return 0;
}
~ianmdlvl / elogind.git / blobdiff