+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <errno.h>
-#include <malloc.h>
-#include <sys/un.h>
-
-#ifdef HAVE_SELINUX
-#include <selinux/selinux.h>
-#include <selinux/label.h>
-#include <selinux/context.h>
-#endif
-
-#include "strv.h"
-#include "path-util.h"
-#include "selinux-util.h"
-
-#ifdef HAVE_SELINUX
-DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon);
-DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
-
-#define _cleanup_security_context_free_ _cleanup_(freeconp)
-#define _cleanup_context_free_ _cleanup_(context_freep)
-
-static int cached_use = -1;
-static struct selabel_handle *label_hnd = NULL;
-
-#define log_enforcing(...) log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, __VA_ARGS__)
-#endif
-
-bool mac_selinux_use(void) {
-#ifdef HAVE_SELINUX
- if (cached_use < 0)
- cached_use = is_selinux_enabled() > 0;
-
- return cached_use;
-#else
- return false;
-#endif
-}
-
-void mac_selinux_retest(void) {
-#ifdef HAVE_SELINUX
- cached_use = -1;
-#endif
-}
-
-int mac_selinux_init(const char *prefix) {
- int r = 0;
-
-#ifdef HAVE_SELINUX
- usec_t before_timestamp, after_timestamp;
- struct mallinfo before_mallinfo, after_mallinfo;
-
- if (!mac_selinux_use())
- return 0;
-
- if (label_hnd)
- return 0;
-
- before_mallinfo = mallinfo();
- before_timestamp = now(CLOCK_MONOTONIC);
-
- if (prefix) {
- struct selinux_opt options[] = {
- { .type = SELABEL_OPT_SUBSET, .value = prefix },
- };
-
- label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options));
- } else
- label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
-
- if (!label_hnd) {
- log_enforcing("Failed to initialize SELinux context: %m");
- r = security_getenforce() == 1 ? -errno : 0;
- } else {
- char timespan[FORMAT_TIMESPAN_MAX];
- int l;
-
- after_timestamp = now(CLOCK_MONOTONIC);
- after_mallinfo = mallinfo();
-
- l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
-
- log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.",
- format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0),
- (l+1023)/1024);
- }
-#endif
-
- return r;
-}
-
-void mac_selinux_finish(void) {
-
-#ifdef HAVE_SELINUX
- if (!label_hnd)
- return;
-
- selabel_close(label_hnd);
- label_hnd = NULL;
-#endif
-}
-
-int mac_selinux_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
-
-#ifdef HAVE_SELINUX
- struct stat st;
- int r;
-
- assert(path);
-
- /* if mac_selinux_init() wasn't called before we are a NOOP */
- if (!label_hnd)
- return 0;
-
- r = lstat(path, &st);
- if (r >= 0) {
- _cleanup_security_context_free_ security_context_t fcon = NULL;
-
- r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
-
- /* If there's no label to set, then exit without warning */
- if (r < 0 && errno == ENOENT)
- return 0;
-
- if (r >= 0) {
- r = lsetfilecon(path, fcon);
-
- /* If the FS doesn't support labels, then exit without warning */
- if (r < 0 && errno == EOPNOTSUPP)
- return 0;
- }
- }
-
- if (r < 0) {
- /* Ignore ENOENT in some cases */
- if (ignore_enoent && errno == ENOENT)
- return 0;
-
- if (ignore_erofs && errno == EROFS)
- return 0;
-
- log_enforcing("Unable to fix SELinux security context of %s: %m", path);
- if (security_getenforce() == 1)
- return -errno;
- }
-#endif
-
- return 0;
-}
-
-int mac_selinux_apply(const char *path, const char *label) {
-
-#ifdef HAVE_SELINUX
- assert(path);
- assert(label);
-
- if (!mac_selinux_use())
- return 0;
-
- if (setfilecon(path, (security_context_t) label) < 0) {
- log_enforcing("Failed to set SELinux security context %s on path %s: %m", label, path);
- if (security_getenforce() == 1)
- return -errno;
- }
-#endif
- return 0;
-}
-
-int mac_selinux_get_create_label_from_exe(const char *exe, char **label) {
- int r = -EOPNOTSUPP;
-
-#ifdef HAVE_SELINUX
- _cleanup_security_context_free_ security_context_t mycon = NULL, fcon = NULL;
- security_class_t sclass;
-
- assert(exe);
- assert(label);
-
- if (!mac_selinux_use())
- return -EOPNOTSUPP;
-
- r = getcon(&mycon);
- if (r < 0)
- return -errno;
-
- r = getfilecon(exe, &fcon);
- if (r < 0)
- return -errno;
-
- sclass = string_to_security_class("process");
- r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
- if (r < 0)
- return -errno;
-#endif
-
- return r;
-}
-
-int mac_selinux_get_our_label(char **label) {
- int r = -EOPNOTSUPP;
-
- assert(label);
-
-#ifdef HAVE_SELINUX
- if (!mac_selinux_use())
- return -EOPNOTSUPP;
-
- r = getcon(label);
- if (r < 0)
- return -errno;
-#endif
-
- return r;
-}
-
-int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, const char *exec_label, char **label) {
- int r = -EOPNOTSUPP;
-
-#ifdef HAVE_SELINUX
- _cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL;
- _cleanup_context_free_ context_t pcon = NULL, bcon = NULL;
- security_class_t sclass;
- const char *range = NULL;
-
- assert(socket_fd >= 0);
- assert(exe);
- assert(label);
-
- if (!mac_selinux_use())
- return -EOPNOTSUPP;
-
- r = getcon(&mycon);
- if (r < 0)
- return -errno;
-
- r = getpeercon(socket_fd, &peercon);
- if (r < 0)
- return -errno;
-
- if (!exec_label) {
- /* If there is no context set for next exec let's use context
- of target executable */
- r = getfilecon(exe, &fcon);
- if (r < 0)
- return -errno;
- }
-
- bcon = context_new(mycon);
- if (!bcon)
- return -ENOMEM;
-
- pcon = context_new(peercon);
- if (!pcon)
- return -ENOMEM;
-
- range = context_range_get(pcon);
- if (!range)
- return -errno;
-
- r = context_range_set(bcon, range);
- if (r)
- return -errno;
-
- freecon(mycon);
- mycon = strdup(context_str(bcon));
- if (!mycon)
- return -ENOMEM;
-
- sclass = string_to_security_class("process");
- r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
- if (r < 0)
- return -errno;
-#endif
-
- return r;
-}
-
-void mac_selinux_free(char *label) {
-
-#ifdef HAVE_SELINUX
- if (!mac_selinux_use())
- return;
-
- freecon((security_context_t) label);
-#endif
-}
-
-int mac_selinux_create_file_prepare(const char *path, mode_t mode) {
- int r = 0;
-
-#ifdef HAVE_SELINUX
- _cleanup_security_context_free_ security_context_t filecon = NULL;
-
- assert(path);
-
- if (!label_hnd)
- return 0;
-
- if (path_is_absolute(path))
- r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
- else {
- _cleanup_free_ char *newpath;
-
- newpath = path_make_absolute_cwd(path);
- if (!newpath)
- return -ENOMEM;
-
- r = selabel_lookup_raw(label_hnd, &filecon, newpath, mode);
- }
-
- /* No context specified by the policy? Proceed without setting it. */
- if (r < 0 && errno == ENOENT)
- return 0;
-
- if (r < 0)
- r = -errno;
- else {
- r = setfscreatecon(filecon);
- if (r < 0) {
- log_enforcing("Failed to set SELinux security context %s for %s: %m", filecon, path);
- r = -errno;
- }
- }
-
- if (r < 0 && security_getenforce() == 0)
- r = 0;
-#endif
-
- return r;
-}
-
-void mac_selinux_create_file_clear(void) {
-
-#ifdef HAVE_SELINUX
- PROTECT_ERRNO;
-
- if (!mac_selinux_use())
- return;
-
- setfscreatecon(NULL);
-#endif
-}
-
-int mac_selinux_create_socket_prepare(const char *label) {
-
-#ifdef HAVE_SELINUX
- if (!mac_selinux_use())
- return 0;
-
- assert(label);
-
- if (setsockcreatecon((security_context_t) label) < 0) {
- log_enforcing("Failed to set SELinux security context %s for sockets: %m", label);
-
- if (security_getenforce() == 1)
- return -errno;
- }
-#endif
-
- return 0;
-}
-
-void mac_selinux_create_socket_clear(void) {
-
-#ifdef HAVE_SELINUX
- PROTECT_ERRNO;
-
- if (!mac_selinux_use())
- return;
-
- setsockcreatecon(NULL);
-#endif
-}
-
-int mac_selinux_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) {
-
- /* Binds a socket and label its file system object according to the SELinux policy */
-
-#ifdef HAVE_SELINUX
- _cleanup_security_context_free_ security_context_t fcon = NULL;
- const struct sockaddr_un *un;
- char *path;
- int r;
-
- assert(fd >= 0);
- assert(addr);
- assert(addrlen >= sizeof(sa_family_t));
-
- if (!label_hnd)
- goto skipped;
-
- /* Filter out non-local sockets */
- if (addr->sa_family != AF_UNIX)
- goto skipped;
-
- /* Filter out anonymous sockets */
- if (addrlen < sizeof(sa_family_t) + 1)
- goto skipped;
-
- /* Filter out abstract namespace sockets */
- un = (const struct sockaddr_un*) addr;
- if (un->sun_path[0] == 0)
- goto skipped;
-
- path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path));
-
- if (path_is_absolute(path))
- r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK);
- else {
- _cleanup_free_ char *newpath;
-
- newpath = path_make_absolute_cwd(path);
- if (!newpath)
- return -ENOMEM;
-
- r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK);
- }
-
- if (r == 0)
- r = setfscreatecon(fcon);
-
- if (r < 0 && errno != ENOENT) {
- log_enforcing("Failed to set SELinux security context %s for %s: %m", fcon, path);
-
- if (security_getenforce() == 1) {
- r = -errno;
- goto finish;
- }
- }
-
- r = bind(fd, addr, addrlen);
- if (r < 0)
- r = -errno;
-
-finish:
- setfscreatecon(NULL);
- return r;
-
-skipped:
-#endif
- return bind(fd, addr, addrlen) < 0 ? -errno : 0;
-}
~ianmdlvl / elogind.git / blobdiff