254 lines
8.8 KiB
C
254 lines
8.8 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 (C) 2013 Intel Corporation
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Authors:
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Nathaniel Chen <nathaniel.chen@intel.com>
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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 Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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 <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "alloc-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "macro.h"
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#include "smack-setup.h"
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#include "string-util.h"
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#include "util.h"
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#ifdef HAVE_SMACK
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static int write_access2_rules(const char* srcdir) {
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_cleanup_close_ int load2_fd = -1, change_fd = -1;
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *entry;
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char buf[NAME_MAX];
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int dfd = -1;
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int r = 0;
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load2_fd = open("/sys/fs/smackfs/load2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (load2_fd < 0) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
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return -errno; /* negative error */
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}
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change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (change_fd < 0) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
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return -errno; /* negative error */
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}
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/* write rules to load2 or change-rule from every file in the directory */
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dir = opendir(srcdir);
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if (!dir) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
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return errno; /* positive on purpose */
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}
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dfd = dirfd(dir);
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assert(dfd >= 0);
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FOREACH_DIRENT(entry, dir, return 0) {
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int fd;
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_cleanup_fclose_ FILE *policy = NULL;
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if (!dirent_is_file(entry))
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continue;
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fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
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if (fd < 0) {
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if (r == 0)
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r = -errno;
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log_warning_errno(errno, "Failed to open '%s': %m", entry->d_name);
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continue;
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}
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policy = fdopen(fd, "re");
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if (!policy) {
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if (r == 0)
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r = -errno;
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safe_close(fd);
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log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
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continue;
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}
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/* load2 write rules in the kernel require a line buffered stream */
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FOREACH_LINE(buf, policy,
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log_error_errno(errno, "Failed to read line from '%s': %m",
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entry->d_name)) {
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_cleanup_free_ char *sbj = NULL, *obj = NULL, *acc1 = NULL, *acc2 = NULL;
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if (isempty(truncate_nl(buf)))
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continue;
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/* if 3 args -> load rule : subject object access1 */
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/* if 4 args -> change rule : subject object access1 access2 */
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if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
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log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
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continue;
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}
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if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
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if (r == 0)
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r = -errno;
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log_error_errno(errno, "Failed to write '%s' to '%s' in '%s'",
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buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
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}
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}
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}
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return r;
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}
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static int write_cipso2_rules(const char* srcdir) {
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_cleanup_close_ int cipso2_fd = -1;
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *entry;
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char buf[NAME_MAX];
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int dfd = -1;
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int r = 0;
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cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (cipso2_fd < 0) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
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return -errno; /* negative error */
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}
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/* write rules to cipso2 from every file in the directory */
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dir = opendir(srcdir);
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if (!dir) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
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return errno; /* positive on purpose */
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}
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dfd = dirfd(dir);
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assert(dfd >= 0);
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FOREACH_DIRENT(entry, dir, return 0) {
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int fd;
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_cleanup_fclose_ FILE *policy = NULL;
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if (!dirent_is_file(entry))
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continue;
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fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
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if (fd < 0) {
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if (r == 0)
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r = -errno;
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log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
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continue;
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}
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policy = fdopen(fd, "re");
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if (!policy) {
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if (r == 0)
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r = -errno;
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safe_close(fd);
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log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
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continue;
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}
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/* cipso2 write rules in the kernel require a line buffered stream */
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FOREACH_LINE(buf, policy,
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log_error_errno(errno, "Failed to read line from '%s': %m",
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entry->d_name)) {
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if (isempty(truncate_nl(buf)))
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continue;
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if (write(cipso2_fd, buf, strlen(buf)) < 0) {
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if (r == 0)
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r = -errno;
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log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s'",
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buf, entry->d_name);
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break;
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}
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}
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}
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return r;
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}
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#endif
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int mac_smack_setup(bool *loaded_policy) {
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#ifdef HAVE_SMACK
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int r;
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assert(loaded_policy);
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r = write_access2_rules("/etc/smack/accesses.d/");
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switch(r) {
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case -ENOENT:
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log_debug("Smack is not enabled in the kernel.");
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return 0;
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case ENOENT:
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log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
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return 0;
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case 0:
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log_info("Successfully loaded Smack policies.");
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break;
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default:
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log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m");
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return 0;
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}
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#ifdef SMACK_RUN_LABEL
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r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, 0);
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if (r)
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log_warning_errno(r, "Failed to set SMACK label \"%s\" on self: %m", SMACK_RUN_LABEL);
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#endif
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r = write_cipso2_rules("/etc/smack/cipso.d/");
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switch(r) {
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case -ENOENT:
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log_debug("Smack/CIPSO is not enabled in the kernel.");
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return 0;
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case ENOENT:
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log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
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return 0;
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case 0:
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log_info("Successfully loaded Smack/CIPSO policies.");
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break;
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default:
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log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
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return 0;
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}
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*loaded_policy = true;
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#endif
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return 0;
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}
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