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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 size_t digest_len;
static void usage(const char *progname)
{
fprintf(stderr,
"usage: %s -b backend [-d] [-v] [-B] [-i] [-f file]\n\n"
"Where:\n\t"
"-b The backend - \"file\", \"media\", \"x\", \"db\" or "
"\"prop\"\n\t"
"-v Run \"cat <specfile_list> | openssl dgst -sha1 -hex\"\n\t"
" on the list of specfiles to compare the SHA1 digests.\n\t"
"-B Use base specfiles only (valid for \"-b file\" only).\n\t"
"-i Do not request a digest.\n\t"
"-f Optional file containing the specs (defaults to\n\t"
" those used by loaded policy).\n\n",
progname);
exit(1);
}
static int run_check_digest(char *cmd, char *selabel_digest)
{
FILE *fp;
char files_digest[128];
char *files_ptr;
int rc = 0;
fp = popen(cmd, "r");
if (!fp) {
printf("Failed to run command line\n");
return -1;
}
/* Only expect one line "(stdin)= x.." so read and find first space */
while (fgets(files_digest, sizeof(files_digest) - 1, fp) != NULL)
;
files_ptr = strstr(files_digest, " ");
rc = strncmp(selabel_digest, files_ptr + 1, digest_len * 2);
if (rc) {
printf("Failed validation:\n\tselabel_digest: %s\n\t"
"files_digest: %s\n",
selabel_digest, files_ptr + 1);
} else {
printf("Passed validation - digest: %s\n", selabel_digest);
}
pclose(fp);
return rc;
}
int main(int argc, char **argv)
{
int backend = 0, rc, opt, validate = 0;
char *baseonly = NULL, *file = NULL, *digest = (char *)1;
char **specfiles = NULL;
unsigned char *sha1_digest = NULL;
size_t i, num_specfiles;
char cmd_buf[4096];
char *cmd_ptr;
char *sha1_buf;
struct selabel_handle *hnd;
struct selinux_opt selabel_option[] = {
{ SELABEL_OPT_PATH, file },
{ SELABEL_OPT_BASEONLY, baseonly },
{ SELABEL_OPT_DIGEST, digest }
};
if (argc < 3)
usage(argv[0]);
while ((opt = getopt(argc, argv, "ib:Bvf:")) > 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 {
fprintf(stderr, "Unknown backend: %s\n",
optarg);
usage(argv[0]);
}
break;
case 'B':
baseonly = (char *)1;
break;
case 'v':
validate = 1;
break;
case 'i':
digest = NULL;
break;
case 'f':
file = optarg;
break;
default:
usage(argv[0]);
}
}
memset(cmd_buf, 0, sizeof(cmd_buf));
selabel_option[0].value = file;
selabel_option[1].value = baseonly;
selabel_option[2].value = digest;
hnd = selabel_open(backend, selabel_option, 3);
if (!hnd) {
switch (errno) {
case EOVERFLOW:
fprintf(stderr, "ERROR Number of specfiles or specfile"
" buffer caused an overflow.\n");
break;
default:
fprintf(stderr, "ERROR: selabel_open: %s\n",
strerror(errno));
}
return -1;
}
rc = selabel_digest(hnd, &sha1_digest, &digest_len, &specfiles,
&num_specfiles);
if (rc) {
switch (errno) {
case EINVAL:
fprintf(stderr, "No digest available.\n");
break;
default:
fprintf(stderr, "selabel_digest ERROR: %s\n",
strerror(errno));
}
goto err;
}
sha1_buf = malloc(digest_len * 2 + 1);
if (!sha1_buf) {
fprintf(stderr, "Could not malloc buffer ERROR: %s\n",
strerror(errno));
rc = -1;
goto err;
}
printf("SHA1 digest: ");
for (i = 0; i < digest_len; i++)
sprintf(&(sha1_buf[i * 2]), "%02x", sha1_digest[i]);
printf("%s\n", sha1_buf);
printf("calculated using the following specfile(s):\n");
if (specfiles) {
cmd_ptr = &cmd_buf[0];
sprintf(cmd_ptr, "/usr/bin/cat ");
cmd_ptr = &cmd_buf[0] + strlen(cmd_buf);
for (i = 0; i < num_specfiles; i++) {
sprintf(cmd_ptr, "%s ", specfiles[i]);
cmd_ptr += strlen(specfiles[i]) + 1;
printf("%s\n", specfiles[i]);
}
sprintf(cmd_ptr, "| /usr/bin/openssl dgst -sha1 -hex");
if (validate)
rc = run_check_digest(cmd_buf, sha1_buf);
}
free(sha1_buf);
err:
selabel_close(hnd);
return rc;
}
|
