blob: b8f874f37178f61bfdbfa5e3f2a620071bde8d2b [file] [log] [blame]
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "selinux_internal.h"
#include "policy.h"
#include <limits.h>
int security_canonicalize_context(const char * con,
char ** canoncon)
{
char path[PATH_MAX];
char *buf;
size_t size;
int fd, ret;
if (!selinux_mnt) {
errno = ENOENT;
return -1;
}
snprintf(path, sizeof path, "%s/context", selinux_mnt);
fd = open(path, O_RDWR);
if (fd < 0)
return -1;
size = selinux_page_size;
buf = malloc(size);
if (!buf) {
ret = -1;
goto out;
}
strncpy(buf, con, size);
ret = write(fd, buf, strlen(buf) + 1);
if (ret < 0)
goto out2;
memset(buf, 0, size);
ret = read(fd, buf, size - 1);
if (ret < 0 && errno == EINVAL) {
/* Fall back to the original context for kernels
that do not support the extended interface. */
strncpy(buf, con, size);
}
*canoncon = strdup(buf);
if (!(*canoncon)) {
ret = -1;
goto out2;
}
ret = 0;
out2:
free(buf);
out:
close(fd);
return ret;
}