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selinux: split off selinux calls into seperate file label.c

This commit is contained in:
Lennart Poettering 2010-08-11 22:58:34 +02:00
parent 7fab9d01b5
commit e51bc1a23e
10 changed files with 343 additions and 267 deletions
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1
Makefile.am
View File

@ -240,6 +240,7 @@ noinst_LTLIBRARIES = \
libsystemd_basic_la_SOURCES = \
src/util.c \
src/label.c \
src/hashmap.c \
src/set.c \
src/strv.c \

2
fixme
View File

@ -85,6 +85,8 @@
* plymouth different shut down msgs
* fix nscd disable
External:
* sysv functions should color when stdout is tty, not stdin

1
src/automount.c
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@ -37,6 +37,7 @@
#include "dbus-automount.h"
#include "bus-errors.h"
#include "special.h"
#include "label.h"
static const UnitActiveState state_translation_table[_AUTOMOUNT_STATE_MAX] = {
[AUTOMOUNT_DEAD] = UNIT_INACTIVE,

291
src/label.c Normal file
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@ -0,0 +1,291 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
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 General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <sys/stat.h>
#include <unistd.h>
#include "label.h"
#include "util.h"
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#include <selinux/label.h>
static struct selabel_handle *label_hnd = NULL;
static inline bool use_selinux(void) {
static int use_selinux_ind = -1;
if (use_selinux_ind < 0)
use_selinux_ind = is_selinux_enabled() > 0;
return use_selinux_ind;
}
static int label_get_file_label_from_path(
const char *label,
const char *path,
const char *class,
security_context_t *fcon) {
security_context_t dir_con = NULL;
security_class_t sclass;
int r = 0;
r = getfilecon(path, &dir_con);
if (r >= 0) {
r = -1;
errno = EINVAL;
if ((sclass = string_to_security_class(class)) != 0)
r = security_compute_create((security_context_t) label, dir_con, sclass, fcon);
}
if (r < 0)
r = -errno;
freecon(dir_con);
return r;
}
#endif
int label_init(void) {
int r = 0;
#ifdef HAVE_SELINUX
if (!use_selinux())
return 0;
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;
}
#endif
return r;
}
int label_fix(const char *path) {
int r = 0;
#ifdef HAVE_SELINUX
struct stat st;
security_context_t fcon;
if (!use_selinux() || !label_hnd)
return 0;
r = lstat(path, &st);
if (r == 0) {
r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
if (r == 0) {
r = setfilecon(path, fcon);
freecon(fcon);
}
}
if (r < 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() && label_hnd)
selabel_close(label_hnd);
#endif
}
int label_get_socket_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_fifofile_set(const char *label, const char *path) {
int r = 0;
#ifdef HAVE_SELINUX
security_context_t filecon = NULL;
if (!use_selinux() || !label)
return 0;
if (((r = label_get_file_label_from_path(label, path, "fifo_file", &filecon)) == 0)) {
if ((r = setfscreatecon(filecon)) < 0) {
log_error("Failed to set SELinux file context (%s) on %s: %m", label, 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_file_clear(void) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return;
setfscreatecon(NULL);
#endif
}
void label_socket_clear(void) {
#ifdef HAVE_SELINUX
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(
const char *path,
mode_t mode) {
/* Creates a directory and labels it according to the SELinux policy */
#ifdef HAVE_SELINUX
int r;
security_context_t fcon = NULL;
if (use_selinux() && label_hnd) {
if (path[0] == '/')
r = selabel_lookup_raw(label_hnd, &fcon, path, mode);
else {
char *cwd = NULL, *newpath = NULL;
cwd = get_current_dir_name();
if (cwd || asprintf(&newpath, "%s/%s", cwd, path) < 0) {
free(cwd);
return -errno;
}
r = selabel_lookup_raw(label_hnd, &fcon, newpath, mode);
free(cwd);
free(newpath);
}
if (r == 0)
r = setfscreatecon(fcon);
if (r < 0 && errno != ENOENT) {
log_error("Failed to set security context %s for %s: %m", fcon, path);
r = -errno;
if (security_getenforce() == 1)
goto finish;
}
}
if ((r = mkdir(path, mode)) < 0)
r = -errno;
finish:
if (use_selinux() && label_hnd) {
setfscreatecon(NULL);
freecon(fcon);
}
return r;
#else
return mkdir(path, mode);
#endif
}

44
src/label.h Normal file
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@ -0,0 +1,44 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
#ifndef foolabelhfoo
#define foolabelhfoo
/***
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 General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/types.h>
int label_init(void);
void label_finish(void);
int label_fix(const char *path);
int label_socket_set(const char *label);
void label_socket_clear(void);
int label_fifofile_set(const char *label, const char *path);
void label_file_clear(void);
void label_free(const char *label);
int label_get_socket_label_from_exe(const char *exe, char **label);
int label_mkdir(const char *path, mode_t mode);
#endif

1
src/main.c
View File

@ -45,6 +45,7 @@
#include "conf-parser.h"
#include "bus-errors.h"
#include "missing.h"
#include "label.h"
static enum {
ACTION_RUN,

1
src/socket-util.c
View File

@ -34,6 +34,7 @@
#include "util.h"
#include "socket-util.h"
#include "missing.h"
#include "label.h"
int socket_address_parse(SocketAddress *a, const char *s) {
int r;

1
src/socket.c
View File

@ -40,6 +40,7 @@
#include "missing.h"
#include "special.h"
#include "bus-errors.h"
#include "label.h"
static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
[SOCKET_DEAD] = UNIT_INACTIVE,

258
src/util.c
View File

@ -55,263 +55,7 @@
#include "missing.h"
#include "log.h"
#include "strv.h"
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#include <selinux/label.h>
static struct selabel_handle *label_hnd = NULL;
static inline bool use_selinux(void) {
static int use_selinux_ind = -1;
if (use_selinux_ind < 0)
use_selinux_ind = is_selinux_enabled() > 0;
return use_selinux_ind;
}
static int label_get_file_label_from_path(
const char *label,
const char *path,
const char *class,
security_context_t *fcon) {
security_context_t dir_con = NULL;
security_class_t sclass;
int r = 0;
r = getfilecon(path, &dir_con);
if (r >= 0) {
r = -1;
errno = EINVAL;
if ((sclass = string_to_security_class(class)) != 0)
r = security_compute_create((security_context_t) label, dir_con, sclass, fcon);
}
if (r < 0)
r = -errno;
freecon(dir_con);
return r;
}
#endif
int label_init(void) {
int r = 0;
#ifdef HAVE_SELINUX
if (!use_selinux())
return 0;
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;
}
#endif
return r;
}
int label_fix(const char *path) {
int r = 0;
#ifdef HAVE_SELINUX
struct stat st;
security_context_t fcon;
if (!use_selinux() || !label_hnd)
return 0;
r = lstat(path, &st);
if (r == 0) {
r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
if (r == 0) {
r = setfilecon(path, fcon);
freecon(fcon);
}
}
if (r < 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() && label_hnd)
selabel_close(label_hnd);
#endif
}
int label_get_socket_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_fifofile_set(const char *label, const char *path) {
int r = 0;
#ifdef HAVE_SELINUX
security_context_t filecon = NULL;
if (!use_selinux() || !label)
return 0;
if (((r = label_get_file_label_from_path(label, path, "fifo_file", &filecon)) == 0)) {
if ((r = setfscreatecon(filecon)) < 0) {
log_error("Failed to set SELinux file context (%s) on %s: %m", label, 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_file_clear(void) {
#ifdef HAVE_SELINUX
if (!use_selinux())
return;
setfscreatecon(NULL);
#endif
}
void label_socket_clear(void) {
#ifdef HAVE_SELINUX
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(
const char *path,
mode_t mode) {
#ifdef HAVE_SELINUX
int r;
security_context_t fcon = NULL;
if (use_selinux() && label_hnd) {
if (path[0] == '/') {
r = selabel_lookup_raw(label_hnd, &fcon, path, mode);
}
else {
char *cwd = NULL;
char *newpath = NULL;
cwd = getcwd(NULL,0);
if ((! cwd) || (asprintf(&newpath, "%s/%s",cwd,path) < 0)) {
free(cwd);
return -errno;
}
r = selabel_lookup_raw(label_hnd, &fcon, newpath, mode);
free(cwd);
free(newpath);
}
if (r == 0)
r = setfscreatecon(fcon);
if ((r < 0) && (errno != ENOENT)) {
log_error("Failed to set security context %s for %s", fcon, path);
if (security_getenforce() == 1)
goto finish;
}
}
r = mkdir(path, mode);
finish:
if (use_selinux() && label_hnd) {
setfscreatecon(NULL);
freecon(fcon);
}
return r;
#else
return mkdir(path, mode);
#endif
}
#include "label.h"
bool streq_ptr(const char *a, const char *b) {

10
src/util.h
View File

@ -361,14 +361,4 @@ int ip_tos_from_string(const char *s);
const char *signal_to_string(int i);
int signal_from_string(const char *s);
int label_init(void);
int label_fix(const char *path);
void label_finish(void);
int label_socket_set(const char *label);
void label_socket_clear(void);
int label_fifofile_set(const char *label, const char *path);
void label_file_clear(void);
void label_free(const char *label);
int label_get_socket_label_from_exe(const char *exe, char **label);
#endif