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414 lines
10 KiB
C
414 lines
10 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <malloc.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "label.h"
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#include "util.h"
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#ifdef HAVE_SELINUX
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#include <selinux/selinux.h>
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#include <selinux/label.h>
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static struct selabel_handle *label_hnd = NULL;
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static int use_selinux_cached = -1;
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static inline bool use_selinux(void) {
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if (use_selinux_cached < 0)
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use_selinux_cached = is_selinux_enabled() > 0;
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return use_selinux_cached;
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}
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void label_retest_selinux(void) {
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use_selinux_cached = -1;
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}
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#endif
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int label_init(void) {
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int r = 0;
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#ifdef HAVE_SELINUX
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usec_t before_timestamp, after_timestamp;
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struct mallinfo before_mallinfo, after_mallinfo;
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if (!use_selinux())
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return 0;
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if (label_hnd)
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return 0;
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before_mallinfo = mallinfo();
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before_timestamp = now(CLOCK_MONOTONIC);
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label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
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if (!label_hnd) {
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log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
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"Failed to initialize SELinux context: %m");
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r = security_getenforce() == 1 ? -errno : 0;
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} else {
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char timespan[FORMAT_TIMESPAN_MAX];
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int l;
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after_timestamp = now(CLOCK_MONOTONIC);
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after_mallinfo = mallinfo();
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l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
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log_info("Successfully loaded SELinux database in %s, size on heap is %iK.",
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format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp),
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(l+1023)/1024);
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}
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#endif
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return r;
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}
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int label_fix(const char *path, bool ignore_enoent) {
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int r = 0;
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#ifdef HAVE_SELINUX
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struct stat st;
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security_context_t fcon;
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if (!use_selinux() || !label_hnd)
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return 0;
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r = lstat(path, &st);
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if (r == 0) {
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r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
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/* If there's no label to set, then exit without warning */
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if (r < 0 && errno == ENOENT)
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return 0;
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if (r == 0) {
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r = lsetfilecon(path, fcon);
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freecon(fcon);
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/* If the FS doesn't support labels, then exit without warning */
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if (r < 0 && errno == ENOTSUP)
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return 0;
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}
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}
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if (r < 0) {
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/* Ignore ENOENT in some cases */
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if (ignore_enoent && errno == ENOENT)
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return 0;
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log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
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"Unable to fix label of %s: %m", path);
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r = security_getenforce() == 1 ? -errno : 0;
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}
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#endif
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return r;
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}
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void label_finish(void) {
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#ifdef HAVE_SELINUX
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if (use_selinux() && label_hnd)
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selabel_close(label_hnd);
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#endif
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}
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int label_get_create_label_from_exe(const char *exe, char **label) {
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int r = 0;
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#ifdef HAVE_SELINUX
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security_context_t mycon = NULL, fcon = NULL;
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security_class_t sclass;
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if (!use_selinux()) {
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*label = NULL;
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return 0;
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}
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r = getcon(&mycon);
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if (r < 0)
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goto fail;
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r = getfilecon(exe, &fcon);
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if (r < 0)
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goto fail;
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sclass = string_to_security_class("process");
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r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
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if (r == 0)
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log_debug("SELinux Socket context for %s will be set to %s", exe, *label);
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fail:
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if (r < 0 && security_getenforce() == 1)
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r = -errno;
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freecon(mycon);
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freecon(fcon);
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#endif
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return r;
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}
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int label_fifofile_set(const char *path) {
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int r = 0;
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#ifdef HAVE_SELINUX
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security_context_t filecon = NULL;
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if (!use_selinux() || !label_hnd)
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return 0;
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r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFIFO);
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if (r < 0)
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r = -errno;
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else if (r == 0) {
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r = setfscreatecon(filecon);
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if (r < 0) {
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log_error("Failed to set SELinux file context on %s: %m", path);
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r = -errno;
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}
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freecon(filecon);
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}
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if (r < 0 && security_getenforce() == 0)
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r = 0;
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#endif
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return r;
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}
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int label_symlinkfile_set(const char *path) {
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int r = 0;
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#ifdef HAVE_SELINUX
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security_context_t filecon = NULL;
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if (!use_selinux() || !label_hnd)
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return 0;
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r = selabel_lookup_raw(label_hnd, &filecon, path, S_IFLNK);
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if (r < 0)
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r = -errno;
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else if (r == 0) {
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r = setfscreatecon(filecon);
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if (r < 0) {
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log_error("Failed to set SELinux file context on %s: %m", path);
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r = -errno;
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}
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freecon(filecon);
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}
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if (r < 0 && security_getenforce() == 0)
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r = 0;
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#endif
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return r;
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}
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int label_socket_set(const char *label) {
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#ifdef HAVE_SELINUX
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if (!use_selinux())
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return 0;
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if (setsockcreatecon((security_context_t) label) < 0) {
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log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
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"Failed to set SELinux context (%s) on socket: %m", label);
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if (security_getenforce() == 1)
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return -errno;
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}
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#endif
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return 0;
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}
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void label_file_clear(void) {
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#ifdef HAVE_SELINUX
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if (!use_selinux())
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return;
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setfscreatecon(NULL);
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#endif
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}
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void label_socket_clear(void) {
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#ifdef HAVE_SELINUX
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if (!use_selinux())
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return;
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setsockcreatecon(NULL);
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#endif
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}
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void label_free(const char *label) {
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#ifdef HAVE_SELINUX
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if (!use_selinux())
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return;
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freecon((security_context_t) label);
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#endif
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}
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int label_mkdir(const char *path, mode_t mode) {
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/* Creates a directory and labels it according to the SELinux policy */
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#ifdef HAVE_SELINUX
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int r;
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security_context_t fcon = NULL;
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if (!use_selinux() || !label_hnd)
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goto skipped;
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if (path_is_absolute(path))
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r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR);
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else {
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char *newpath;
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newpath = path_make_absolute_cwd(path);
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if (!newpath)
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return -ENOMEM;
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r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR);
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free(newpath);
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}
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if (r == 0)
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r = setfscreatecon(fcon);
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if (r < 0 && errno != ENOENT) {
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log_error("Failed to set security context %s for %s: %m", fcon, path);
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if (security_getenforce() == 1) {
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r = -errno;
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goto finish;
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}
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}
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r = mkdir(path, mode);
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if (r < 0)
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r = -errno;
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finish:
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setfscreatecon(NULL);
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freecon(fcon);
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return r;
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skipped:
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#endif
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return mkdir(path, mode) < 0 ? -errno : 0;
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}
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int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
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/* Binds a socket and label its file system object according to the SELinux policy */
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#ifdef HAVE_SELINUX
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int r;
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security_context_t fcon = NULL;
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const struct sockaddr_un *un;
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char *path = NULL;
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assert(fd >= 0);
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assert(addr);
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assert(addrlen >= sizeof(sa_family_t));
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if (!use_selinux() || !label_hnd)
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goto skipped;
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/* Filter out non-local sockets */
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if (addr->sa_family != AF_UNIX)
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goto skipped;
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/* Filter out anonymous sockets */
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if (addrlen < sizeof(sa_family_t) + 1)
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goto skipped;
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/* Filter out abstract namespace sockets */
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un = (const struct sockaddr_un*) addr;
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if (un->sun_path[0] == 0)
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goto skipped;
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path = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
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if (!path)
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return -ENOMEM;
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if (path_is_absolute(path))
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r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK);
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else {
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char *newpath;
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newpath = path_make_absolute_cwd(path);
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if (!newpath) {
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free(path);
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return -ENOMEM;
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}
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r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK);
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free(newpath);
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}
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if (r == 0)
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r = setfscreatecon(fcon);
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if (r < 0 && errno != ENOENT) {
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log_error("Failed to set security context %s for %s: %m", fcon, path);
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if (security_getenforce() == 1) {
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r = -errno;
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goto finish;
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}
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}
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r = bind(fd, addr, addrlen);
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if (r < 0)
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r = -errno;
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finish:
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setfscreatecon(NULL);
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freecon(fcon);
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free(path);
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return r;
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skipped:
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#endif
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return bind(fd, addr, addrlen) < 0 ? -errno : 0;
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}
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