101 lines
4.1 KiB
C
101 lines
4.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#if HAVE_APPARMOR
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# include <sys/apparmor.h>
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#endif
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#include <unistd.h>
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#include "apparmor-setup.h"
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#include "apparmor-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 "string-util.h"
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#include "strv.h"
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#if HAVE_APPARMOR
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DEFINE_TRIVIAL_CLEANUP_FUNC(aa_policy_cache *, aa_policy_cache_unref);
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DEFINE_TRIVIAL_CLEANUP_FUNC(aa_features *, aa_features_unref);
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#endif
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int mac_apparmor_setup(void) {
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#if HAVE_APPARMOR
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int r;
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_cleanup_(aa_policy_cache_unrefp) aa_policy_cache *policy_cache = NULL;
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_cleanup_(aa_features_unrefp) aa_features *features = NULL;
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const char *current_file;
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_cleanup_free_ char *current_profile = NULL, *cache_dir_path = NULL;
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if (!mac_apparmor_use()) {
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log_debug("AppArmor either not supported by the kernel or disabled.");
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return 0;
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}
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/* To enable LSM stacking a patch to the kernel is proposed to create a
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* per-LSM subdirectory to distinguish between the LSMs. Therefore, we
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* read the file from the LSM specific directory first and only if that
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* fails the one from the generic directory.
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*/
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FOREACH_STRING(current_file, "/proc/self/attr/apparmor/current", "/proc/self/attr/current") {
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r = read_one_line_file(current_file, ¤t_profile);
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if (r == -ENOENT)
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continue;
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else if (r < 0)
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log_warning_errno(r, "Failed to read current AppArmor profile from file %s, ignoring: %m", current_file);
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else
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break;
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}
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if (!current_profile) {
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log_warning("Failed to get the current AppArmor profile of systemd from /proc/self/attr/apparmor/current or /proc/self/attr/current, ignoring.");
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return 0;
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}
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if (!streq(current_profile, "unconfined")) {
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log_debug("We are already confined in an AppArmor profile.");
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return 0;
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}
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r = aa_features_new_from_kernel(&features);
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if (r < 0) {
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log_warning_errno(errno, "Failed to get the AppArmor feature set from the kernel, ignoring: %m");
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return 0;
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}
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cache_dir_path = aa_policy_cache_dir_path_preview(features, AT_FDCWD, "/etc/apparmor/earlypolicy");
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if (!cache_dir_path) {
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log_debug_errno(errno, "Failed to get the path of the early AppArmor policy cache directory.");
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return 0;
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}
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/* aa_policy_cache_new will internally use the same path as aa_policy_cache_dir_path_preview has returned. */
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r = aa_policy_cache_new(&policy_cache, features, AT_FDCWD, "/etc/apparmor/earlypolicy", 0);
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if (r < 0) {
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if (errno == ENOENT) {
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log_debug_errno(errno, "The early AppArmor policy cache directory %s does not exist.", cache_dir_path);
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return 0;
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}
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log_warning_errno(errno, "Failed to create a new AppArmor policy cache, ignoring: %m");
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return 0;
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}
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r = aa_policy_cache_replace_all(policy_cache, NULL);
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if (r < 0) {
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log_warning_errno(errno, "Failed to load the profiles from the early AppArmor policy cache directory %s, ignoring: %m", cache_dir_path);
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return 0;
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}
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log_info("Successfully loaded all binary profiles from AppArmor early policy cache at %s.", cache_dir_path);
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r = aa_change_profile("systemd");
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if (r < 0) {
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if (errno == ENOENT)
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log_debug_errno(errno, "Failed to change to AppArmor profile 'systemd'. Please ensure that one of the binary profile files in policy cache directory %s contains a profile with that name.", cache_dir_path);
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else
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log_error_errno(errno, "Failed to change to AppArmor profile 'systemd': %m");
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return 0;
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}
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log_info("Changed to AppArmor profile systemd.");
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#endif
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return 0;
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}
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