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label: rearrange mandatory access control(MAC) apis

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move label apis to selinux-util.ch or smack-util.ch appropriately.
This commit is contained in:
WaLyong Cho 2014-10-23 17:23:45 +09:00 committed by Lennart Poettering
parent 99a1ab10b0
commit 66b6d9d5b5
8 changed files with 579 additions and 596 deletions
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554
src/shared/label.c
View File

@ -19,170 +19,8 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <unistd.h>
#include <malloc.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/xattr.h>
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#include <selinux/label.h>
#include <selinux/context.h>
#endif
#include "label.h"
#include "strv.h"
#include "util.h"
#include "path-util.h"
#include "selinux-util.h"
#include "smack-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 struct selabel_handle *label_hnd = NULL;
#endif
static int smack_relabel_in_dev(const char *path) {
int r = 0;
#ifdef HAVE_SMACK
struct stat sb;
const char *label;
/*
* Path must be in /dev and must exist
*/
if (!path_startswith(path, "/dev"))
return 0;
r = lstat(path, &sb);
if (r < 0)
return -errno;
/*
* Label directories and character devices "*".
* Label symlinks "_".
* Don't change anything else.
*/
if (S_ISDIR(sb.st_mode))
label = SMACK_STAR_LABEL;
else if (S_ISLNK(sb.st_mode))
label = SMACK_FLOOR_LABEL;
else if (S_ISCHR(sb.st_mode))
label = SMACK_STAR_LABEL;
else
return 0;
r = setxattr(path, "security.SMACK64", label, strlen(label), 0);
if (r < 0) {
log_error("Smack relabeling \"%s\" %m", path);
return -errno;
}
#endif
return r;
}
int label_init(const char *prefix) {
int r = 0;
#ifdef HAVE_SELINUX
usec_t before_timestamp, after_timestamp;
struct mallinfo before_mallinfo, after_mallinfo;
if (!use_selinux())
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_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"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;
}
static int label_fix_selinux(const char *path, bool ignore_enoent, bool ignore_erofs) {
int r = 0;
#ifdef HAVE_SELINUX
struct stat st;
security_context_t fcon;
if (!label_hnd)
return 0;
r = lstat(path, &st);
if (r == 0) {
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);
freecon(fcon);
/* If the FS doesn't support labels, then exit without warning */
if (r < 0 && errno == ENOTSUP)
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_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"Unable to fix label of %s: %m", path);
r = security_getenforce() == 1 ? -errno : 0;
}
#endif
return r;
}
int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
int r = 0;
@ -201,395 +39,3 @@ int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
return r;
}
void label_finish(void) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return;
if (label_hnd)
selabel_close(label_hnd);
#endif
}
int label_get_create_label_from_exe(const char *exe, char **label) {
int r = 0;
#ifdef HAVE_SELINUX
security_context_t mycon = NULL, fcon = NULL;
security_class_t sclass;
if (!use_selinux()) {
*label = NULL;
return 0;
}
r = getcon(&mycon);
if (r < 0)
goto fail;
r = getfilecon(exe, &fcon);
if (r < 0)
goto fail;
sclass = string_to_security_class("process");
r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
if (r == 0)
log_debug("SELinux Socket context for %s will be set to %s", exe, *label);
fail:
if (r < 0 && security_getenforce() == 1)
r = -errno;
freecon(mycon);
freecon(fcon);
#endif
return r;
}
int label_get_our_label(char **label) {
int r = -EOPNOTSUPP;
#ifdef HAVE_SELINUX
char *l = NULL;
r = getcon(&l);
if (r < 0)
return r;
*label = l;
#endif
return r;
}
int label_get_child_mls_label(int socket_fd, const char *exe, char **label) {
int r = -EOPNOTSUPP;
#ifdef HAVE_SELINUX
_cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL, ret = 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);
r = getcon(&mycon);
if (r < 0) {
r = -EINVAL;
goto out;
}
r = getpeercon(socket_fd, &peercon);
if (r < 0) {
r = -EINVAL;
goto out;
}
r = getexeccon(&fcon);
if (r < 0) {
r = -EINVAL;
goto out;
}
if (!fcon) {
/* If there is no context set for next exec let's use context
of target executable */
r = getfilecon(exe, &fcon);
if (r < 0) {
r = -errno;
goto out;
}
}
bcon = context_new(mycon);
if (!bcon) {
r = -ENOMEM;
goto out;
}
pcon = context_new(peercon);
if (!pcon) {
r = -ENOMEM;
goto out;
}
range = context_range_get(pcon);
if (!range) {
r = -errno;
goto out;
}
r = context_range_set(bcon, range);
if (r) {
r = -errno;
goto out;
}
freecon(mycon);
mycon = strdup(context_str(bcon));
if (!mycon) {
r = -errno;
goto out;
}
sclass = string_to_security_class("process");
r = security_compute_create(mycon, fcon, sclass, &ret);
if (r < 0) {
r = -EINVAL;
goto out;
}
*label = ret;
ret = NULL;
r = 0;
out:
if (r < 0 && security_getenforce() == 1)
return r;
#endif
return r;
}
int label_context_set(const char *path, mode_t mode) {
int r = 0;
#ifdef HAVE_SELINUX
security_context_t filecon = NULL;
if (!use_selinux() || !label_hnd)
return 0;
r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
if (r < 0 && errno != ENOENT)
r = -errno;
else if (r == 0) {
r = setfscreatecon(filecon);
if (r < 0) {
log_error("Failed to set SELinux file context on %s: %m", path);
r = -errno;
}
freecon(filecon);
}
if (r < 0 && security_getenforce() == 0)
r = 0;
#endif
return r;
}
int label_socket_set(const char *label) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return 0;
if (setsockcreatecon((security_context_t) label) < 0) {
log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"Failed to set SELinux context (%s) on socket: %m", label);
if (security_getenforce() == 1)
return -errno;
}
#endif
return 0;
}
void label_context_clear(void) {
#ifdef HAVE_SELINUX
PROTECT_ERRNO;
if (!use_selinux())
return;
setfscreatecon(NULL);
#endif
}
void label_socket_clear(void) {
#ifdef HAVE_SELINUX
PROTECT_ERRNO;
if (!use_selinux())
return;
setsockcreatecon(NULL);
#endif
}
void label_free(const char *label) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return;
freecon((security_context_t) label);
#endif
}
static int label_mkdir_selinux(const char *path, mode_t mode) {
int r = 0;
#ifdef HAVE_SELINUX
/* Creates a directory and labels it according to the SELinux policy */
security_context_t fcon = NULL;
if (!label_hnd)
return 0;
if (path_is_absolute(path))
r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR);
else {
_cleanup_free_ char *newpath;
newpath = path_make_absolute_cwd(path);
if (!newpath)
return -ENOMEM;
r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR);
}
if (r == 0)
r = setfscreatecon(fcon);
if (r < 0 && errno != ENOENT) {
log_error("Failed to set security context %s for %s: %m", fcon, path);
if (security_getenforce() == 1) {
r = -errno;
goto finish;
}
}
r = mkdir(path, mode);
if (r < 0)
r = -errno;
finish:
setfscreatecon(NULL);
freecon(fcon);
#endif
return r;
}
int label_mkdir(const char *path, mode_t mode) {
int r;
if (use_selinux()) {
r = label_mkdir_selinux(path, mode);
if (r < 0)
return r;
}
if (use_smack()) {
r = mkdir(path, mode);
if (r < 0 && errno != EEXIST)
return -errno;
r = smack_relabel_in_dev(path);
if (r < 0)
return r;
}
r = mkdir(path, mode);
if (r < 0 && errno != EEXIST)
return -errno;
return 0;
}
int label_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
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 (!use_selinux() || !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_error("Failed to set 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);
freecon(fcon);
return r;
skipped:
#endif
return bind(fd, addr, addrlen) < 0 ? -errno : 0;
}
int label_apply(const char *path, const char *label) {
int r = 0;
#ifdef HAVE_SELINUX
if (!use_selinux())
return 0;
r = setfilecon(path, (char *)label);
#endif
return r;
}

31
src/shared/label.h
View File

@ -21,34 +21,7 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/types.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <stdio.h>
int label_init(const char *prefix);
void label_finish(void);
#include "selinux-util.h"
#include "smack-util.h"
int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs);
int label_socket_set(const char *label);
void label_socket_clear(void);
int label_context_set(const char *path, mode_t mode);
void label_context_clear(void);
void label_free(const char *label);
int label_get_create_label_from_exe(const char *exe, char **label);
int label_get_our_label(char **label);
int label_get_child_mls_label(int socket_fd, const char *exec, char **label);
int label_mkdir(const char *path, mode_t mode);
int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen);
int label_apply(const char *path, const char *label);
int label_write_one_line_file_atomic(const char *fn, const char *line);
int label_write_env_file(const char *fname, char **l);
int label_fopen_temporary(const char *path, FILE **_f, char **_temp_path);

26
src/shared/mkdir-label.c
View File

@ -32,6 +32,32 @@
#include "path-util.h"
#include "mkdir.h"
static int label_mkdir(const char *path, mode_t mode) {
int r;
if (use_selinux()) {
r = label_mkdir_selinux(path, mode);
if (r < 0)
return r;
}
if (use_smack()) {
r = mkdir(path, mode);
if (r < 0 && errno != EEXIST)
return -errno;
r = smack_relabel_in_dev(path);
if (r < 0)
return r;
}
r = mkdir(path, mode);
if (r < 0 && errno != EEXIST)
return -errno;
return 0;
}
int mkdir_label(const char *path, mode_t mode) {
return label_mkdir(path, mode);
}

2
src/shared/mkdir.h
View File

@ -29,7 +29,7 @@ int mkdir_safe(const char *path, mode_t mode, uid_t uid, gid_t gid);
int mkdir_parents(const char *path, mode_t mode);
int mkdir_p(const char *path, mode_t mode);
/* selinux versions */
/* mandatory access control(MAC) versions */
int mkdir_label(const char *path, mode_t mode);
int mkdir_safe_label(const char *path, mode_t mode, uid_t uid, gid_t gid);
int mkdir_parents_label(const char *path, mode_t mode);

489
src/shared/selinux-util.c
View File

@ -19,33 +19,502 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <unistd.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);
#include <selinux/selinux.h>
#define _cleanup_security_context_free_ _cleanup_(freeconp)
#define _cleanup_context_free_ _cleanup_(context_freep)
static int use_selinux_cached = -1;
static struct selabel_handle *label_hnd = NULL;
#endif
bool use_selinux(void) {
#ifdef HAVE_SELINUX
if (use_selinux_cached < 0)
use_selinux_cached = is_selinux_enabled() > 0;
return use_selinux_cached;
}
void retest_selinux(void) {
use_selinux_cached = -1;
}
#else
bool use_selinux(void) {
return false;
#endif
}
void retest_selinux(void) {
#ifdef HAVE_SELINUX
use_selinux_cached = -1;
#endif
}
int label_init(const char *prefix) {
int r = 0;
#ifdef HAVE_SELINUX
usec_t before_timestamp, after_timestamp;
struct mallinfo before_mallinfo, after_mallinfo;
if (!use_selinux())
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_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"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;
}
int label_fix_selinux(const char *path, bool ignore_enoent, bool ignore_erofs) {
int r = 0;
#ifdef HAVE_SELINUX
struct stat st;
security_context_t fcon;
if (!label_hnd)
return 0;
r = lstat(path, &st);
if (r == 0) {
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);
freecon(fcon);
/* If the FS doesn't support labels, then exit without warning */
if (r < 0 && errno == ENOTSUP)
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_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"Unable to fix label of %s: %m", path);
r = security_getenforce() == 1 ? -errno : 0;
}
#endif
return r;
}
void label_finish(void) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return;
if (label_hnd)
selabel_close(label_hnd);
#endif
}
int label_get_create_label_from_exe(const char *exe, char **label) {
int r = 0;
#ifdef HAVE_SELINUX
security_context_t mycon = NULL, fcon = NULL;
security_class_t sclass;
if (!use_selinux()) {
*label = NULL;
return 0;
}
r = getcon(&mycon);
if (r < 0)
goto fail;
r = getfilecon(exe, &fcon);
if (r < 0)
goto fail;
sclass = string_to_security_class("process");
r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
if (r == 0)
log_debug("SELinux Socket context for %s will be set to %s", exe, *label);
fail:
if (r < 0 && security_getenforce() == 1)
r = -errno;
freecon(mycon);
freecon(fcon);
#endif
return r;
}
int label_get_our_label(char **label) {
int r = -EOPNOTSUPP;
#ifdef HAVE_SELINUX
char *l = NULL;
r = getcon(&l);
if (r < 0)
return r;
*label = l;
#endif
return r;
}
int label_get_child_mls_label(int socket_fd, const char *exe, char **label) {
int r = -EOPNOTSUPP;
#ifdef HAVE_SELINUX
_cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL, ret = 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);
r = getcon(&mycon);
if (r < 0) {
r = -EINVAL;
goto out;
}
r = getpeercon(socket_fd, &peercon);
if (r < 0) {
r = -EINVAL;
goto out;
}
r = getexeccon(&fcon);
if (r < 0) {
r = -EINVAL;
goto out;
}
if (!fcon) {
/* If there is no context set for next exec let's use context
of target executable */
r = getfilecon(exe, &fcon);
if (r < 0) {
r = -errno;
goto out;
}
}
bcon = context_new(mycon);
if (!bcon) {
r = -ENOMEM;
goto out;
}
pcon = context_new(peercon);
if (!pcon) {
r = -ENOMEM;
goto out;
}
range = context_range_get(pcon);
if (!range) {
r = -errno;
goto out;
}
r = context_range_set(bcon, range);
if (r) {
r = -errno;
goto out;
}
freecon(mycon);
mycon = strdup(context_str(bcon));
if (!mycon) {
r = -errno;
goto out;
}
sclass = string_to_security_class("process");
r = security_compute_create(mycon, fcon, sclass, &ret);
if (r < 0) {
r = -EINVAL;
goto out;
}
*label = ret;
ret = NULL;
r = 0;
out:
if (r < 0 && security_getenforce() == 1)
return r;
#endif
return r;
}
int label_context_set(const char *path, mode_t mode) {
int r = 0;
#ifdef HAVE_SELINUX
security_context_t filecon = NULL;
if (!use_selinux() || !label_hnd)
return 0;
r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
if (r < 0 && errno != ENOENT)
r = -errno;
else if (r == 0) {
r = setfscreatecon(filecon);
if (r < 0) {
log_error("Failed to set SELinux file context on %s: %m", path);
r = -errno;
}
freecon(filecon);
}
if (r < 0 && security_getenforce() == 0)
r = 0;
#endif
return r;
}
int label_socket_set(const char *label) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return 0;
if (setsockcreatecon((security_context_t) label) < 0) {
log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG,
"Failed to set SELinux context (%s) on socket: %m", label);
if (security_getenforce() == 1)
return -errno;
}
#endif
return 0;
}
void label_context_clear(void) {
#ifdef HAVE_SELINUX
PROTECT_ERRNO;
if (!use_selinux())
return;
setfscreatecon(NULL);
#endif
}
void label_socket_clear(void) {
#ifdef HAVE_SELINUX
PROTECT_ERRNO;
if (!use_selinux())
return;
setsockcreatecon(NULL);
#endif
}
void label_free(const char *label) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return;
freecon((security_context_t) label);
#endif
}
int label_mkdir_selinux(const char *path, mode_t mode) {
int r = 0;
#ifdef HAVE_SELINUX
/* Creates a directory and labels it according to the SELinux policy */
security_context_t fcon = NULL;
if (!label_hnd)
return 0;
if (path_is_absolute(path))
r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR);
else {
_cleanup_free_ char *newpath;
newpath = path_make_absolute_cwd(path);
if (!newpath)
return -ENOMEM;
r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR);
}
if (r == 0)
r = setfscreatecon(fcon);
if (r < 0 && errno != ENOENT) {
log_error("Failed to set security context %s for %s: %m", fcon, path);
if (security_getenforce() == 1) {
r = -errno;
goto finish;
}
}
r = mkdir(path, mode);
if (r < 0)
r = -errno;
finish:
setfscreatecon(NULL);
freecon(fcon);
#endif
return r;
}
int label_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
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 (!use_selinux() || !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_error("Failed to set 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);
freecon(fcon);
return r;
skipped:
#endif
return bind(fd, addr, addrlen) < 0 ? -errno : 0;
}
int label_apply(const char *path, const char *label) {
int r = 0;
#ifdef HAVE_SELINUX
if (!use_selinux())
return 0;
r = setfilecon(path, (char *)label);
#endif
return r;
}

27
src/shared/selinux-util.h
View File

@ -21,7 +21,34 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/socket.h>
#include <stdio.h>
#include <stdbool.h>
bool use_selinux(void);
void retest_selinux(void);
int label_init(const char *prefix);
int label_fix_selinux(const char *path, bool ignore_enoent, bool ignore_erofs);
void label_finish(void);
int label_socket_set(const char *label);
void label_socket_clear(void);
int label_context_set(const char *path, mode_t mode);
void label_context_clear(void);
void label_free(const char *label);
int label_mkdir_selinux(const char *path, mode_t mode);
int label_get_create_label_from_exe(const char *exe, char **label);
int label_get_our_label(char **label);
int label_get_child_mls_label(int socket_fd, const char *exec, char **label);
int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen);
int label_apply(const char *path, const char *label);
int label_write_one_line_file_atomic(const char *fn, const char *line);
int label_write_env_file(const char *fname, char **l);
int label_fopen_temporary(const char *path, FILE **_f, char **_temp_path);

45
src/shared/smack-util.c
View File

@ -21,10 +21,10 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <unistd.h>
#include <string.h>
#include <sys/xattr.h>
#include "util.h"
#include "path-util.h"
#include "smack-util.h"
bool use_smack(void) {
@ -87,3 +87,44 @@ int smack_label_ip_in_fd(int fd, const char *label) {
return 0;
#endif
}
int smack_relabel_in_dev(const char *path) {
int r = 0;
#ifdef HAVE_SMACK
struct stat sb;
const char *label;
/*
* Path must be in /dev and must exist
*/
if (!path_startswith(path, "/dev"))
return 0;
r = lstat(path, &sb);
if (r < 0)
return -errno;
/*
* Label directories and character devices "*".
* Label symlinks "_".
* Don't change anything else.
*/
if (S_ISDIR(sb.st_mode))
label = SMACK_STAR_LABEL;
else if (S_ISLNK(sb.st_mode))
label = SMACK_FLOOR_LABEL;
else if (S_ISCHR(sb.st_mode))
label = SMACK_STAR_LABEL;
else
return 0;
r = setxattr(path, "security.SMACK64", label, strlen(label), 0);
if (r < 0) {
log_error("Smack relabeling \"%s\" %m", path);
return -errno;
}
#endif
return r;
}

1
src/shared/smack-util.h
View File

@ -34,3 +34,4 @@ int smack_label_path(const char *path, const char *label);
int smack_label_fd(int fd, const char *label);
int smack_label_ip_in_fd(int fd, const char *label);
int smack_label_ip_out_fd(int fd, const char *label);
int smack_relabel_in_dev(const char *path);