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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <stdbool.h>
#include <fts.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
#include "../src/label_file.h"
static __attribute__ ((__noreturn__)) void usage(const char *progname)
{
fprintf(stderr,
"usage: %s [-vr] [-f file] path\n\n"
"Where:\n\t"
"-v Validate file_contxts entries against loaded policy.\n\t"
"-r Recursively descend directories.\n\t"
"-f Optional file_contexts file (defaults to current policy).\n\t"
"path Path to check current SHA1 digest against file_contexts entries.\n\n"
"This will check the directory selinux.sehash SHA1 digest for "
"<path> against\na newly generated digest based on the "
"file_context entries for that node\n(using the regx, mode "
"and path entries).\n", progname);
exit(1);
}
int main(int argc, char **argv)
{
int opt, fts_flags;
size_t i, digest_len;
bool status, recurse = false;
FTS *fts;
FTSENT *ftsent;
char *validate = NULL, *file = NULL;
char *paths[2] = { NULL, NULL };
uint8_t *xattr_digest = NULL;
uint8_t *calculated_digest = NULL;
char *sha1_buf = NULL;
struct selabel_handle *hnd;
struct selinux_opt selabel_option[] = {
{ SELABEL_OPT_PATH, file },
{ SELABEL_OPT_VALIDATE, validate }
};
if (argc < 2)
usage(argv[0]);
while ((opt = getopt(argc, argv, "f:rv")) > 0) {
switch (opt) {
case 'f':
file = optarg;
break;
case 'r':
recurse = true;
break;
case 'v':
validate = (char *)1;
break;
default:
usage(argv[0]);
}
}
if (optind >= argc) {
fprintf(stderr, "No pathname specified\n");
exit(-1);
}
paths[0] = argv[optind];
selabel_option[0].value = file;
selabel_option[1].value = validate;
hnd = selabel_open(SELABEL_CTX_FILE, selabel_option, 2);
if (!hnd) {
fprintf(stderr, "ERROR: selabel_open - Could not obtain "
"handle: %s\n",
strerror(errno));
return -1;
}
fts_flags = FTS_PHYSICAL | FTS_NOCHDIR;
fts = fts_open(paths, fts_flags, NULL);
if (!fts) {
printf("fts error on %s: %s\n",
paths[0], strerror(errno));
return -1;
}
while ((ftsent = fts_read(fts)) != NULL) {
switch (ftsent->fts_info) {
case FTS_DP:
continue;
case FTS_D: {
xattr_digest = NULL;
calculated_digest = NULL;
digest_len = 0;
status = selabel_get_digests_all_partial_matches(hnd,
ftsent->fts_path,
&calculated_digest,
&xattr_digest,
&digest_len);
sha1_buf = calloc(1, digest_len * 2 + 1);
if (!sha1_buf) {
fprintf(stderr, "Could not calloc buffer ERROR: %s\n",
strerror(errno));
return -1;
}
if (status) { /* They match */
printf("xattr and file_contexts SHA1 digests match for: %s\n",
ftsent->fts_path);
if (calculated_digest) {
for (i = 0; i < digest_len; i++)
sprintf((&sha1_buf[i * 2]),
"%02x",
calculated_digest[i]);
printf("SHA1 digest: %s\n", sha1_buf);
}
} else {
if (!calculated_digest) {
printf("No SHA1 digest available for: %s\n",
ftsent->fts_path);
printf("as file_context entry is \"<<none>>\"\n");
goto cleanup;
}
printf("The file_context entries for: %s\n",
ftsent->fts_path);
for (i = 0; i < digest_len; i++)
sprintf((&sha1_buf[i * 2]), "%02x",
calculated_digest[i]);
printf("generated SHA1 digest: %s\n", sha1_buf);
if (!xattr_digest) {
printf("however there is no selinux.sehash xattr entry.\n");
} else {
printf("however it does NOT match the current entry of:\n");
for (i = 0; i < digest_len; i++)
sprintf((&sha1_buf[i * 2]),
"%02x",
xattr_digest[i]);
printf("%s\n", sha1_buf);
}
}
cleanup:
free(xattr_digest);
free(calculated_digest);
free(sha1_buf);
break;
}
default:
break;
}
if (!recurse)
break;
}
(void) fts_close(fts);
(void) selabel_close(hnd);
return 0;
}
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