| /*-*- 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 |
| } |