11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
405 lines
14 KiB
C
405 lines
14 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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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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***/
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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 <stdio_ext.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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#if ENABLE_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)) || strchr(COMMENTS, *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)) || strchr(COMMENTS, *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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static int write_netlabel_rules(const char* srcdir) {
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_cleanup_fclose_ FILE *dst = NULL;
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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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dst = fopen("/sys/fs/smackfs/netlabel", "we");
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if (!dst) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
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return -errno; /* negative error */
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}
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/* write rules to dst 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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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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(void) __fsetlocking(policy, FSETLOCKING_BYCALLER);
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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", entry->d_name)) {
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int q;
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if (!fputs(buf, dst)) {
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if (r == 0)
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r = -EINVAL;
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log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel");
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break;
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}
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q = fflush_and_check(dst);
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if (q < 0) {
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if (r == 0)
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r = q;
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log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
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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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static int write_onlycap_list(void) {
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_cleanup_close_ int onlycap_fd = -1;
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_cleanup_free_ char *list = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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size_t len = 0, allocated = 0;
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char buf[LINE_MAX];
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int r;
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f = fopen("/etc/smack/onlycap", "re");
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if (!f) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to read '/etc/smack/onlycap'");
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return errno == ENOENT ? ENOENT : -errno;
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}
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FOREACH_LINE(buf, f, return -errno) {
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size_t l;
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if (isempty(truncate_nl(buf)) || strchr(COMMENTS, *buf))
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continue;
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l = strlen(buf);
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if (!GREEDY_REALLOC(list, allocated, len + l + 1))
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return log_oom();
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stpcpy(list + len, buf)[0] = ' ';
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len += l + 1;
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}
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if (!len)
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return 0;
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list[len - 1] = 0;
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onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (onlycap_fd < 0) {
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if (errno != ENOENT)
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log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap'");
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return -errno; /* negative error */
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}
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r = write(onlycap_fd, list, len);
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if (r < 0)
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return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap'", list);
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return 0;
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}
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#endif
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int mac_smack_setup(bool *loaded_policy) {
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#if ENABLE_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 < 0)
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log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
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r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, 0);
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if (r < 0)
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log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
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r = write_string_file("/sys/fs/smackfs/netlabel",
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"0.0.0.0/0 " SMACK_RUN_LABEL, 0);
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if (r < 0)
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log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
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r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", 0);
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if (r < 0)
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log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
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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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break;
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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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break;
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}
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r = write_netlabel_rules("/etc/smack/netlabel.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 network host rules directory '/etc/smack/netlabel.d/' not found");
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break;
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case 0:
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log_info("Successfully loaded Smack network host rules.");
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break;
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default:
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log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
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break;
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}
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r = write_onlycap_list();
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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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break;
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case ENOENT:
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log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
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break;
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case 0:
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log_info("Successfully wrote Smack onlycap list.");
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break;
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default:
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log_emergency_errno(r, "Failed to write Smack onlycap list.");
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return r;
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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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