+#if HAVE_SELINUX
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+
+static struct selabel_handle *label_hnd = NULL;
+
+static inline int use_selinux(void) {
+ static int use_selinux_ind = -1;
+
+ if (use_selinux_ind == -1)
+ use_selinux_ind = (is_selinux_enabled() == 1);
+
+ return use_selinux_ind;
+}
+
+static int label_get_file_label_from_path(
+ const char *label,
+ const char *path,
+ const char *class,
+ security_context_t *fcon) {
+
+ security_context_t dir_con = NULL;
+ security_class_t sclass;
+ int r = 0;
+
+ r = getfilecon(path, &dir_con);
+ if (r >= 0) {
+ r = -1;
+ if ((sclass = string_to_security_class(class)) != 0)
+ r = security_compute_create((security_context_t) label, dir_con, sclass, fcon);
+ }
+ if (r < 0)
+ r = -errno;
+
+ freecon(dir_con);
+ return r;
+}
+
+#endif
+
+int label_init(void) {
+ int r = 0;
+
+#if HAVE_SELINUX
+ if (use_selinux()) {
+ 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;
+ }
+ }
+#endif
+
+ return r;
+}
+
+int label_fix(const char *path) {
+ int r = 0;
+#if HAVE_SELINUX
+ struct stat st;
+ security_context_t fcon;
+ if (use_selinux()) {
+ r = lstat(path, &st);
+
+ if (r == 0) {
+ r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
+
+ if (r == 0) {
+ r = setfilecon(path, fcon);
+ freecon(fcon);
+ }
+ }
+ if (r < 0) {
+ log_error("Unable to fix label of %s: %m", path);
+ r = (security_getenforce() == 1) ? -errno : 0;
+ }
+ }
+#endif
+ return r;
+}
+
+void label_finish(void) {
+
+#if HAVE_SELINUX
+ if (use_selinux())
+ selabel_close(label_hnd);
+#endif
+
+}
+
+int label_get_socket_label_from_exe(
+ const char *exe,
+ char **label) {
+ int r = 0;
+
+#if HAVE_SELINUX
+ security_context_t mycon = NULL, fcon = NULL;
+ security_class_t sclass;
+
+ 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_fifofile_set(const char *label, const char *path) {
+ int r = 0;
+
+#if HAVE_SELINUX
+ security_context_t filecon = NULL;
+ if (use_selinux() && label) {
+ if (((r = label_get_file_label_from_path(label, path, "fifo_file", &filecon)) == 0)) {
+ if ((r = setfscreatecon(filecon)) < 0) {
+ log_error("Failed to set SELinux file context (%s) on %s: %m", label, path);
+ r = -errno;
+ }
+
+ freecon(filecon);
+ }
+
+ if (r < 0 && security_getenforce() == 0)
+ r = 0;
+ }
+#endif
+
+ return r;
+}
+
+int label_socket_set(const char *label) {
+
+#if HAVE_SELINUX
+ if (use_selinux() && setsockcreatecon((security_context_t) label) < 0) {
+ log_error("Failed to set SELinux context (%s) on socket: %m", label);
+ if (security_getenforce() == 1)
+ return -errno;
+ }
+#endif
+
+ return 0;
+}
+
+void label_file_clear(void) {
+
+#if HAVE_SELINUX
+ if (use_selinux())
+ setfscreatecon(NULL);
+#endif
+
+ return;
+}
+
+void label_free(const char *label) {
+
+#if HAVE_SELINUX
+ if (use_selinux())
+ freecon((security_context_t) label);
+#endif
+
+ return;
+}
+
+void label_socket_clear(void) {
+
+#if HAVE_SELINUX
+ if (use_selinux())
+ setsockcreatecon(NULL);
+#endif
+
+ return;
+}
+
+static int label_mkdir(
+ const char *path,
+ mode_t mode) {
+
+#if HAVE_SELINUX
+ int r;
+ security_context_t fcon = NULL;
+
+ if (use_selinux()) {
+ if (path[0] == '/') {
+ r = selabel_lookup_raw(label_hnd, &fcon, path, mode);
+ }
+ else {
+ char *cwd = NULL;
+ char *newpath = NULL;
+ cwd = getcwd(NULL,0);
+ if ((! cwd) || (asprintf(&newpath, "%s/%s",cwd,path) < 0)) {
+ free(cwd);
+ return -errno;
+ }
+ r = selabel_lookup_raw(label_hnd, &fcon, newpath, mode);
+ free(cwd);
+ free(newpath);
+ }
+
+ if (r == 0)
+ r = setfscreatecon(fcon);
+
+ if ((r < 0) && (errno != ENOENT)) {
+ log_error("Failed to set security context %s for %s", fcon, path);
+
+ if (security_getenforce() == 1)
+ goto finish;
+ }
+ }
+ r = mkdir(path, mode);
+
+finish:
+ if (use_selinux()) {
+ setfscreatecon(NULL);
+ freecon(fcon);
+ }
+
+ return r;
+#else
+ return mkdir(path, mode);
+#endif
+}
+
~ianmdlvl / elogind.git / commitdiff