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

   1 /* Copyright (c) 2007-2021, 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 #include "lib/encoding/time_fmt.h"
  14
  15 int
  16 main(int argc, char **argv)
  17 {
  18   ed25519_cert_t *cert = NULL;
  19   char rfc1123_buf[RFC1123_TIME_LEN+1] = "";
  20
  21   if (argc != 2) {
  22     fprintf(stderr, "Usage:\n");
  23     fprintf(stderr, "%s <path to ed25519_signing_cert file>\n", argv[0]);
  24     return -1;
  25   }
  26
  27   const char *filepath = argv[1];
  28   char *got_tag = NULL;
  29
  30   uint8_t certbuf[256];
  31   ssize_t cert_body_len = crypto_read_tagged_contents_from_file(
  32                  filepath, "ed25519v1-cert",
  33                  &got_tag, certbuf, sizeof(certbuf));
  34
  35   if (cert_body_len <= 0) {
  36     fprintf(stderr, "crypto_read_tagged_contents_from_file failed with "
  37                     "error: %s\n", strerror(errno));
  38     return -2;
  39   }
  40
  41   if (!got_tag) {
  42     fprintf(stderr, "Found no tag\n");
  43     return -3;
  44   }
  45
  46   if (strcmp(got_tag, "type4") != 0) {
  47     fprintf(stderr, "Wrong tag: %s\n", got_tag);
  48     return -4;
  49   }
  50
  51   tor_free(got_tag);
  52
  53   ssize_t parsed = ed25519_cert_parse(&cert, certbuf, cert_body_len);
  54   if (parsed <= 0) {
  55     fprintf(stderr, "ed25519_cert_parse failed with return value %" TOR_PRIdSZ
  56                     "\n", parsed);
  57     return -5;
  58   }
  59
  60   time_t expires_at = (time_t)cert->exp_field * 60 * 60;
  61
  62   printf("Expires at: %s", ctime(&expires_at));
  63
  64   format_rfc1123_time(rfc1123_buf, expires_at);
  65   printf("RFC 1123 timestamp: %s\n", rfc1123_buf);
  66
  67   printf("UNIX timestamp: %ld\n", (long int)expires_at);
  68
  69   ed25519_cert_free(cert);
  70
  71   return 0;
  72 }