X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Flabel.c;h=82f10b21bd7142ed2adddd83a186afc67b28be0c;hp=a8bf6bd4f93982ce46ba83edc28b982d01693def;hb=4968105790c65af58d4ab42bffa2a4bedc0be8ee;hpb=a5c32cff1f56afe6f0c6c70d91a88a7a8238b2d7
diff --git a/src/shared/label.c b/src/shared/label.c
index a8bf6bd4f..82f10b21b 100644
--- a/src/shared/label.c
+++ b/src/shared/label.c
@@ -19,368 +19,62 @@
along with systemd; If not, see .
***/
-#include
-#include
-#include
-#include
-#include
-#include
-#include
-#include
-#include
-
-#include "label.h"
-#include "strv.h"
-#include "util.h"
-#include "path-util.h"
-
-#ifdef HAVE_SELINUX
#include "selinux-util.h"
-#include
-#include
-
-static struct selabel_handle *label_hnd = NULL;
-
-#endif
-
-int label_init(const char *prefix) {
- int r = 0;
-
-#ifdef HAVE_SELINUX
- usec_t before_timestamp, after_timestamp;
- struct mallinfo before_mallinfo, after_mallinfo;
-
- if (!use_selinux())
- 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),
- (l+1023)/1024);
- }
-#endif
-
- return r;
-}
+#include "smack-util.h"
+#include "util.h"
+#include "label.h"
int label_fix(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)
- return 0;
-
- r = lstat(path, &st);
- if (r == 0) {
- r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
+ int r, q;
- /* If there's no label to set, then exit without warning */
- if (r < 0 && errno == ENOENT)
- return 0;
+ r = mac_selinux_fix(path, ignore_enoent, ignore_erofs);
+ q = mac_smack_fix(path, ignore_enoent, ignore_erofs);
- if (r == 0) {
- r = lsetfilecon(path, fcon);
- freecon(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 label of %s: %m", path);
- r = security_getenforce() == 1 ? -errno : 0;
- }
-#endif
-
- return r;
-}
-
-void label_finish(void) {
-
-#ifdef HAVE_SELINUX
- if (use_selinux() && label_hnd)
- selabel_close(label_hnd);
-#endif
-}
-
-int label_get_create_label_from_exe(const char *exe, char **label) {
-
- int r = 0;
-
-#ifdef HAVE_SELINUX
- security_context_t mycon = NULL, fcon = NULL;
- security_class_t sclass;
-
- if (!use_selinux()) {
- *label = NULL;
- return 0;
- }
-
- r = getcon(&mycon);
- if (r < 0)
- goto fail;
-
- r = getfilecon(exe, &fcon);
if (r < 0)
- goto fail;
-
- sclass = string_to_security_class("process");
- r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
- if (r == 0)
- log_debug("SELinux Socket context for %s will be set to %s", exe, *label);
-
-fail:
- if (r < 0 && security_getenforce() == 1)
- r = -errno;
-
- freecon(mycon);
- freecon(fcon);
-#endif
-
- return r;
-}
-
-int label_context_set(const char *path, mode_t mode) {
- 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, 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;
- }
-
- freecon(filecon);
- }
-
- if (r < 0 && security_getenforce() == 0)
- r = 0;
-#endif
-
- return r;
-}
-
-int label_socket_set(const char *label) {
-
-#ifdef HAVE_SELINUX
- if (!use_selinux())
- 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 r;
+ if (q < 0)
+ return q;
return 0;
}
-void label_context_clear(void) {
-
-#ifdef HAVE_SELINUX
- if (!use_selinux())
- return;
-
- setfscreatecon(NULL);
-#endif
-}
-
-void label_socket_clear(void) {
-
-#ifdef HAVE_SELINUX
- if (!use_selinux())
- return;
-
- setsockcreatecon(NULL);
-#endif
-}
-
-void label_free(const char *label) {
-
-#ifdef HAVE_SELINUX
- if (!use_selinux())
- return;
-
- freecon((security_context_t) label);
-#endif
-}
-
-int label_mkdir(const char *path, mode_t mode, bool apply) {
-
- /* Creates a directory and labels it according to the SELinux policy */
-#ifdef HAVE_SELINUX
+int mkdir_label(const char *path, mode_t mode) {
int r;
- security_context_t fcon = NULL;
- if (!apply || !use_selinux() || !label_hnd)
- goto skipped;
+ assert(path);
- if (path_is_absolute(path))
- r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR);
- else {
- 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)
- 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);
+ r = mac_selinux_create_file_prepare(path, S_IFDIR);
if (r < 0)
+ return r;
+
+ if (mkdir(path, mode) < 0)
r = -errno;
-finish:
- setfscreatecon(NULL);
- freecon(fcon);
+ mac_selinux_create_file_clear();
- return r;
+ if (r < 0)
+ return r;
-skipped:
-#endif
- return mkdir(path, mode) < 0 ? -errno : 0;
+ return mac_smack_fix(path, false, false);
}
-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 symlink_label(const char *old_path, const char *new_path) {
int r;
- security_context_t fcon = NULL;
- const struct sockaddr_un *un;
- char *path = NULL;
-
- assert(fd >= 0);
- assert(addr);
- assert(addrlen >= sizeof(sa_family_t));
-
- if (!use_selinux() || !label_hnd)
- goto skipped;
- /* Filter out non-local sockets */
- if (addr->sa_family != AF_UNIX)
- goto skipped;
+ assert(old_path);
+ assert(new_path);
- /* 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 = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
- if (!path)
- return -ENOMEM;
-
- if (path_is_absolute(path))
- r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK);
- else {
- char *newpath;
-
- newpath = path_make_absolute_cwd(path);
-
- if (!newpath) {
- free(path);
- return -ENOMEM;
- }
-
- r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK);
- free(newpath);
- }
-
- 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);
+ r = mac_selinux_create_file_prepare(new_path, S_IFLNK);
if (r < 0)
+ return r;
+
+ if (symlink(old_path, new_path) < 0)
r = -errno;
-finish:
- setfscreatecon(NULL);
- freecon(fcon);
- free(path);
+ mac_selinux_create_file_clear();
- return r;
+ if (r < 0)
+ return r;
-skipped:
-#endif
- return bind(fd, addr, addrlen) < 0 ? -errno : 0;
+ return mac_smack_fix(new_path, false, false);
}