-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
#include <stdlib.h>
#include <string.h>
+#include "alloc-util.h"
+#include "dirent-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "string-util.h"
#include "util.h"
-#ifdef HAVE_SMACK
+#if ENABLE_SMACK
static int write_access2_rules(const char* srcdir) {
_cleanup_close_ int load2_fd = -1, change_fd = -1;
return r;
}
+static int write_netlabel_rules(const char* srcdir) {
+ _cleanup_fclose_ FILE *dst = NULL;
+ _cleanup_closedir_ DIR *dir = NULL;
+ struct dirent *entry;
+ char buf[NAME_MAX];
+ int dfd = -1;
+ int r = 0;
+
+ dst = fopen("/sys/fs/smackfs/netlabel", "we");
+ if (!dst) {
+ if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
+ return -errno; /* negative error */
+ }
+
+ /* write rules to dst from every file in the directory */
+ dir = opendir(srcdir);
+ if (!dir) {
+ if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
+ return errno; /* positive on purpose */
+ }
+
+ dfd = dirfd(dir);
+ assert(dfd >= 0);
+
+ FOREACH_DIRENT(entry, dir, return 0) {
+ int fd;
+ _cleanup_fclose_ FILE *policy = NULL;
+
+ fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
+ if (fd < 0) {
+ if (r == 0)
+ r = -errno;
+ log_warning_errno(errno, "Failed to open %s: %m", entry->d_name);
+ continue;
+ }
+
+ policy = fdopen(fd, "re");
+ if (!policy) {
+ if (r == 0)
+ r = -errno;
+ safe_close(fd);
+ log_error_errno(errno, "Failed to open %s: %m", entry->d_name);
+ continue;
+ }
+
+ /* load2 write rules in the kernel require a line buffered stream */
+ FOREACH_LINE(buf, policy,
+ log_error_errno(errno, "Failed to read line from %s: %m",
+ entry->d_name)) {
+ if (!fputs_unlocked(buf, dst)) {
+ if (r == 0)
+ r = -EINVAL;
+ log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel");
+ break;
+ }
+ if (fflush(dst)) {
+ if (r == 0)
+ r = -errno;
+ log_error_errno(errno, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
+ break;
+ }
+ }
+ }
+
+ return r;
+}
+
+static int write_onlycap_list(void) {
+ _cleanup_close_ int onlycap_fd = -1;
+ _cleanup_free_ char *list = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ size_t len = 0, allocated = 0;
+ char buf[LINE_MAX];
+ int r;
+
+ f = fopen("/etc/smack/onlycap", "re");
+ if (!f) {
+ if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to read '/etc/smack/onlycap'");
+ return errno == ENOENT ? ENOENT : -errno;
+ }
+
+ FOREACH_LINE(buf, f, return -errno) {
+ size_t l;
+
+ if (isempty(truncate_nl(buf)) || strchr(COMMENTS, *buf))
+ continue;
+
+ l = strlen(buf);
+ if (!GREEDY_REALLOC(list, allocated, len + l + 1))
+ return log_oom();
+
+ stpcpy(list + len, buf)[0] = ' ';
+ len += l + 1;
+ }
+
+ if (!len)
+ return 0;
+
+ list[len - 1] = 0;
+
+ onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+ if (onlycap_fd < 0) {
+ if (errno != ENOENT)
+ log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap'");
+ return -errno; /* negative error */
+ }
+
+ r = write(onlycap_fd, list, len);
+ if (r < 0)
+ return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap'", list);
+
+ return 0;
+}
+
#endif
int mac_smack_setup(bool *loaded_policy) {
-#ifdef HAVE_SMACK
+#if ENABLE_SMACK
int r;
#ifdef SMACK_RUN_LABEL
r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, 0);
- if (r)
- log_warning_errno(r, "Failed to set SMACK label \"%s\" on self: %m", SMACK_RUN_LABEL);
+ if (r < 0)
+ log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
+ r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, 0);
+ if (r < 0)
+ log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
+ r = write_string_file("/sys/fs/smackfs/netlabel",
+ "0.0.0.0/0 " SMACK_RUN_LABEL, 0);
+ if (r < 0)
+ log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
+ r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", 0);
+ if (r < 0)
+ log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
#endif
r = write_cipso2_rules("/etc/smack/cipso.d/");
return 0;
case ENOENT:
log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
- return 0;
+ break;
case 0:
log_info("Successfully loaded Smack/CIPSO policies.");
break;
default:
log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
+ break;
+ }
+
+ r = write_netlabel_rules("/etc/smack/netlabel.d/");
+ switch(r) {
+ case -ENOENT:
+ log_debug("Smack/CIPSO is not enabled in the kernel.");
return 0;
+ case ENOENT:
+ log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
+ break;
+ case 0:
+ log_info("Successfully loaded Smack network host rules.");
+ break;
+ default:
+ log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
+ break;
+ }
+
+ r = write_onlycap_list();
+ switch(r) {
+ case -ENOENT:
+ log_debug("Smack is not enabled in the kernel.");
+ break;
+ case ENOENT:
+ log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
+ break;
+ case 0:
+ log_info("Successfully wrote Smack onlycap list.");
+ break;
+ default:
+ log_emergency_errno(r, "Failed to write Smack onlycap list.");
+ return r;
}
*loaded_policy = true;
projects / thirdparty / systemd.git / blobdiff