/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <errno.h> #include <sys/stat.h> #include <unistd.h> #include "label.h" #include "util.h" #ifdef HAVE_SELINUX #include <selinux/selinux.h> #include <selinux/label.h> static struct selabel_handle *label_hnd = NULL; static inline bool use_selinux(void) { static int use_selinux_ind = -1; if (use_selinux_ind < 0) use_selinux_ind = is_selinux_enabled() > 0; return use_selinux_ind; } #endif int label_init(void) { int r = 0; #ifdef HAVE_SELINUX if (!use_selinux()) return 0; if (label_hnd) return 0; 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; #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); /* If there's no label to set, then exit without warning */ if (r < 0 && errno == ENOENT) return 0; if (r == 0) { r = setfilecon(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) { 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_socket_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_fifofile_set(const char *path) { int r = 0; #ifdef HAVE_SELINUX security_context_t filecon = NULL; if (!use_selinux() || !label_hnd) return 0; if ((r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFIFO)) == 0) { if ((r = setfscreatecon(filecon)) < 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_symlinkfile_set(const char *path) { int r = 0; #ifdef HAVE_SELINUX security_context_t filecon = NULL; if (!use_selinux() || !label_hnd) return 0; if ((r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFLNK)) == 0) { if ((r = setfscreatecon(filecon)) < 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 0; } void label_file_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) { /* Creates a directory and labels it according to the SELinux policy */ #ifdef HAVE_SELINUX int r; security_context_t fcon = NULL; if (use_selinux() && label_hnd) { if (path_is_absolute(path)) r = selabel_lookup_raw(label_hnd, &fcon, path, mode); else { char *newpath = NULL; if (!(newpath = path_make_absolute_cwd(path))) return -ENOMEM; r = selabel_lookup_raw(label_hnd, &fcon, newpath, mode); 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); r = -errno; if (security_getenforce() == 1) goto finish; } } if ((r = mkdir(path, mode)) < 0) r = -errno; finish: if (use_selinux() && label_hnd) { setfscreatecon(NULL); freecon(fcon); } return r; #else return mkdir(path, mode); #endif }