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/*
* selinux.c - Various SELinux related functionality needed for the loader.
*
* Jeremy Katz <katzj@redhat.com>
*
* Copyright 2004 Red Hat, Inc.
* Portions extracted from libselinux which was released as public domain
* software by the NSA.
*
* This software may be freely redistributed under the terms of the GNU
* General Public License.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <string.h>
#include "loader.h"
#include "loadermisc.h"
#include "log.h"
static char * getpolicyver() {
int fd;
char * buf;
fd = open("/selinux/policyvers", O_RDONLY);
if (fd == -1) {
return NULL;
}
buf = malloc(32);
buf = memset(buf, 0, 32);
if ((read(fd, buf, 32)) == -1) {
logMessage("error getting policy version: %s", strerror(errno));
free(buf);
close(fd);
return NULL;
}
close(fd);
return buf;
}
int loadpolicy() {
char * ver, * fn, * bfn;
char *paths[] = { "/tmp/updates",
"/mnt/source/RHupdates",
"/mnt/runtime/etc/selinux/targeted/policy",
"/mnt/runtime/etc/security/selinux",
NULL };
char *bpaths[] = { "/tmp/updates",
"/mnt/source/RHupdates",
"/mnt/runtime/etc/selinux/targeted",
"/mnt/runtime/etc/security/selinux",
NULL };
int i, pid, status;
ver = getpolicyver();
if (ver == NULL) {
return -1;
}
fn = malloc(128);
fn = memset(fn, 0, 128);
for (i = 0; paths[i]; i++) {
snprintf(fn, 128, "%s/policy.%s", (char *) paths[i], ver);
if (!access(fn, R_OK)) {
break;
}
}
bfn = malloc(128);
bfn = memset(bfn, 0, 128);
for (i = 0; paths[i]; i++) {
snprintf(bfn, 128, "%s/booleans", (char *) bpaths[i]);
if (!access(bfn, R_OK)) {
break;
}
}
if (access(fn, R_OK)) {
logMessage("Unable to load suitable SELinux policy");
return -1;
}
logMessage("Loading SELinux policy from %s", fn);
if (!(pid = fork())) {
setenv("LD_LIBRARY_PATH", LIBPATH, 1);
if (access(bfn, R_OK))
execl("/usr/sbin/load_policy",
"/usr/sbin/load_policy", "-q", fn, NULL);
else
execl("/usr/sbin/load_policy",
"/usr/sbin/load_policy", "-q", "-b", fn, bfn, NULL);
logMessage("exec of load_policy failed: %s", strerror(errno));
exit(1);
}
waitpid(pid, &status, 0);
free(fn);
if (WIFEXITED(status) && (WEXITSTATUS(status) != 0))
return 1;
return 0;
}
/* set a context for execution, from libselinux */
int setexeccon(char * context) {
int fd;
ssize_t ret;
fd = open("/proc/self/attr/exec", O_RDWR);
if (fd < 0)
return -1;
if (context)
ret = write(fd, context, strlen(context)+1);
else
ret = write(fd, NULL, 0); /* clear */
close(fd);
if (ret < 0)
return -1;
else
return 0;
}
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