src/tools/tor-print-ed-signing-cert.c

   1 /* Copyright (c) 2007-2018, The Tor Project, Inc. */
   2 /* See LICENSE for licensing information */
   3
   4 #include <errno.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7 #include <time.h>
   8
   9 #include "trunnel/ed25519_cert.h"
  10 #include "lib/cc/torint.h"  /* TOR_PRIdSZ */
  11 #include "lib/crypt_ops/crypto_format.h"
  12 #include "lib/malloc/malloc.h"
  13
  14 int
  15 main(int argc, char **argv)
  16 {
  17   ed25519_cert_t *cert = NULL;
  18
  19   if (argc != 2) {
  20     fprintf(stderr, "Usage:\n");
  21     fprintf(stderr, "%s <path to ed25519_signing_cert file>\n", argv[0]);
  22     return -1;
  23   }
  24
  25   const char *filepath = argv[1];
  26   char *got_tag = NULL;
  27
  28   uint8_t certbuf[256];
  29   ssize_t cert_body_len = crypto_read_tagged_contents_from_file(
  30                  filepath, "ed25519v1-cert",
  31                  &got_tag, certbuf, sizeof(certbuf));
  32
  33   if (cert_body_len <= 0) {
  34     fprintf(stderr, "crypto_read_tagged_contents_from_file failed with "
  35                     "error: %s\n", strerror(errno));
  36     return -2;
  37   }
  38
  39   if (!got_tag) {
  40     fprintf(stderr, "Found no tag\n");
  41     return -3;
  42   }
  43
  44   if (strcmp(got_tag, "type4") != 0) {
  45     fprintf(stderr, "Wrong tag: %s\n", got_tag);
  46     return -4;
  47   }
  48
  49   tor_free(got_tag);
  50
  51   ssize_t parsed = ed25519_cert_parse(&cert, certbuf, cert_body_len);
  52   if (parsed <= 0) {
  53     fprintf(stderr, "ed25519_cert_parse failed with return value %" TOR_PRIdSZ
  54                     "\n", parsed);
  55     return -5;
  56   }
  57
  58   time_t expires_at = (time_t)cert->exp_field * 60 * 60;
  59
  60   printf("Expires at: %s", ctime(&expires_at));
  61
  62   ed25519_cert_free(cert);
  63
  64   return 0;
  65 }