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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
static __attribute__ ((__noreturn__)) void usage(const char *progname)
{
fprintf(stderr,
"usage: %s -b backend [-v] [-r] -k key [-t type] [-f file]\n\n"
"Where:\n\t"
"-b The backend - \"file\", \"media\", \"x\", \"db\" or "
"\"prop\"\n\t"
"-v Validate entries against loaded policy.\n\t"
"-r Use \"raw\" function.\n\t"
"-k Lookup key - Depends on backend.\n\t"
"-t Lookup type - Optional as depends on backend.\n\t"
"-f Optional file containing the specs (defaults to\n\t"
" those used by loaded policy).\n\n"
"Examples:\n\t"
"%s -v -b file -k /run -t 0\n\t"
" lookup with validation against the loaded policy, the\n\t"
" \"file\" backend for path \"/run\" with mode = 0\n\t"
"%s -r -b x -t 4 -k X11:ButtonPress\n\t"
" lookup_raw the \"X\" backend for type SELABEL_X_EVENT\n\t"
" using key \"X11:ButtonPress\"\n\n",
progname, progname, progname);
exit(1);
}
int main(int argc, char **argv)
{
int raw = 0, type = 0, backend = 0, rc, opt;
char *validate = NULL, *key = NULL, *context = NULL, *file = NULL;
struct selabel_handle *hnd;
struct selinux_opt selabel_option[] = {
{ SELABEL_OPT_PATH, file },
{ SELABEL_OPT_VALIDATE, validate }
};
if (argc < 3)
usage(argv[0]);
while ((opt = getopt(argc, argv, "b:f:vrk:t:")) > 0) {
switch (opt) {
case 'b':
if (!strcasecmp(optarg, "file")) {
backend = SELABEL_CTX_FILE;
} else if (!strcmp(optarg, "media")) {
backend = SELABEL_CTX_MEDIA;
} else if (!strcmp(optarg, "x")) {
backend = SELABEL_CTX_X;
} else if (!strcmp(optarg, "db")) {
backend = SELABEL_CTX_DB;
} else if (!strcmp(optarg, "prop")) {
backend = SELABEL_CTX_ANDROID_PROP;
} else if (!strcmp(optarg, "service")) {
backend = SELABEL_CTX_ANDROID_SERVICE;
} else if (!strcmp(optarg, "keystore2_key")) {
backend = SELABEL_CTX_ANDROID_KEYSTORE2_KEY;
} else {
fprintf(stderr, "Unknown backend: %s\n",
optarg);
usage(argv[0]);
}
break;
case 'f':
file = optarg;
break;
case 'v':
validate = (char *)1;
break;
case 'r':
raw = 1;
break;
case 'k':
key = optarg;
break;
case 't':
type = atoi(optarg);
break;
default:
usage(argv[0]);
}
}
selabel_option[0].value = file;
selabel_option[1].value = validate;
hnd = selabel_open(backend, selabel_option, 2);
if (!hnd) {
fprintf(stderr, "ERROR: selabel_open - Could not obtain "
"handle.\n");
return -1;
}
switch (raw) {
case 1:
rc = selabel_lookup_raw(hnd, &context, key, type);
break;
default:
rc = selabel_lookup(hnd, &context, key, type);
}
selabel_close(hnd);
if (rc) {
switch (errno) {
case ENOENT:
fprintf(stderr, "ERROR: selabel_lookup failed to "
"find a valid context.\n");
break;
case EINVAL:
fprintf(stderr, "ERROR: selabel_lookup failed to "
"validate context, or key / type are "
"invalid.\n");
break;
default:
fprintf(stderr, "selabel_lookup ERROR: %s\n",
strerror(errno));
}
} else {
printf("Default context: %s\n", context);
freecon(context);
}
return rc;
}
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