src/danetool.c

   1 /*
   2  * Copyright (C) 2012 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuTLS.
   5  *
   6  * GnuTLS is free software: you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuTLS is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see
  18  * <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22
  23 #include <gnutls/gnutls.h>
  24 #include <gnutls/x509.h>
  25 #include <gnutls/openpgp.h>
  26 #include <gnutls/pkcs12.h>
  27 #include <gnutls/pkcs11.h>
  28 #include <gnutls/abstract.h>
  29 #include <gnutls/crypto.h>
  30 #include <gnutls/dane.h>
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <ctype.h>
  36 #include <time.h>
  37 #include <unistd.h>
  38 #include <errno.h>
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <fcntl.h>
  42 #include <error.h>
  43
  44 /* Gnulib portability files. */
  45 #include <read-file.h>
  46 #include <progname.h>
  47 #include <version-etc.h>
  48
  49 #include <common.h>
  50 #include "danetool-args.h"
  51 #include "certtool-common.h"
  52
  53 static void cmd_parser (int argc, char **argv);
  54 static void dane_info(const char* host, const char* proto, unsigned int port,
  55                       unsigned int ca, unsigned int local, common_info_st * cinfo);
  56
  57 static void dane_check(const char* host, const char* proto, unsigned int port,
  58                        common_info_st * cinfo);
  59
  60 FILE *outfile;
  61 static gnutls_digest_algorithm_t default_dig;
  62
  63 /* non interactive operation if set
  64  */
  65 int batch;
  66
  67
  68 static void
  69 tls_log_func (int level, const char *str)
  70 {
  71   fprintf (stderr, "|<%d>| %s", level, str);
  72 }
  73
  74 int
  75 main (int argc, char **argv)
  76 {
  77   set_program_name (argv[0]);
  78   cmd_parser (argc, argv);
  79
  80   return 0;
  81 }
  82
  83
  84 static void
  85 cmd_parser (int argc, char **argv)
  86 {
  87   int ret, privkey_op = 0;
  88   common_info_st cinfo;
  89   const char* proto = "tcp";
  90   unsigned int port = 443;
  91
  92   optionProcess( &danetoolOptions, argc, argv);
  93
  94   if (HAVE_OPT(OUTFILE))
  95     {
  96       outfile = safe_open_rw (OPT_ARG(OUTFILE), privkey_op);
  97       if (outfile == NULL)
  98         error (EXIT_FAILURE, errno, "%s", OPT_ARG(OUTFILE));
  99     }
 100   else
 101     outfile = stdout;
 102
 103   default_dig = GNUTLS_DIG_UNKNOWN;
 104   if (HAVE_OPT(HASH))
 105     {
 106       if (strcasecmp (OPT_ARG(HASH), "md5") == 0)
 107         {
 108           fprintf (stderr,
 109                    "Warning: MD5 is broken, and should not be used any more for digital signatures.\n");
 110           default_dig = GNUTLS_DIG_MD5;
 111         }
 112       else if (strcasecmp (OPT_ARG(HASH), "sha1") == 0)
 113         default_dig = GNUTLS_DIG_SHA1;
 114       else if (strcasecmp (OPT_ARG(HASH), "sha256") == 0)
 115         default_dig = GNUTLS_DIG_SHA256;
 116       else if (strcasecmp (OPT_ARG(HASH), "sha224") == 0)
 117         default_dig = GNUTLS_DIG_SHA224;
 118       else if (strcasecmp (OPT_ARG(HASH), "sha384") == 0)
 119         default_dig = GNUTLS_DIG_SHA384;
 120       else if (strcasecmp (OPT_ARG(HASH), "sha512") == 0)
 121         default_dig = GNUTLS_DIG_SHA512;
 122       else if (strcasecmp (OPT_ARG(HASH), "rmd160") == 0)
 123         default_dig = GNUTLS_DIG_RMD160;
 124       else
 125         error (EXIT_FAILURE, 0, "invalid hash: %s", OPT_ARG(HASH));
 126     }
 127
 128   gnutls_global_set_log_function (tls_log_func);
 129
 130   if (HAVE_OPT(DEBUG))
 131     {
 132       gnutls_global_set_log_level (OPT_VALUE_DEBUG);
 133       printf ("Setting log level to %d\n", (int)OPT_VALUE_DEBUG);
 134     }
 135
 136   if ((ret = gnutls_global_init ()) < 0)
 137     error (EXIT_FAILURE, 0, "global_init: %s", gnutls_strerror (ret));
 138
 139 #ifdef ENABLE_PKCS11
 140   pkcs11_common();
 141 #endif
 142
 143   memset (&cinfo, 0, sizeof (cinfo));
 144
 145   if (HAVE_OPT(INDER) || HAVE_OPT(INRAW))
 146     cinfo.incert_format = GNUTLS_X509_FMT_DER;
 147   else
 148     cinfo.incert_format = GNUTLS_X509_FMT_PEM;
 149
 150   if (HAVE_OPT(VERBOSE))
 151     cinfo.verbose = 1;
 152
 153   if (HAVE_OPT(LOAD_PUBKEY))
 154     cinfo.pubkey = OPT_ARG(LOAD_PUBKEY);
 155
 156   if (HAVE_OPT(LOAD_CERTIFICATE))
 157     cinfo.cert = OPT_ARG(LOAD_CERTIFICATE);
 158
 159   if (HAVE_OPT(PORT))
 160     port = OPT_VALUE_PORT;
 161   if (HAVE_OPT(PROTO))
 162     proto = OPT_ARG(PROTO);
 163
 164   if (HAVE_OPT(TLSA_RR))
 165     dane_info (OPT_ARG(HOST), proto, port,
 166                HAVE_OPT(CA), HAVE_OPT(LOCAL), &cinfo);
 167   else if (HAVE_OPT(CHECK))
 168     dane_check (OPT_ARG(CHECK), proto, port,
 169                 &cinfo);
 170   else
 171     USAGE(1);
 172
 173   fclose (outfile);
 174
 175 #ifdef ENABLE_PKCS11
 176   gnutls_pkcs11_deinit ();
 177 #endif
 178   gnutls_global_deinit ();
 179 }
 180
 181 static void dane_check(const char* host, const char* proto, unsigned int port,
 182                        common_info_st * cinfo)
 183 {
 184 dane_state_t s;
 185 dane_query_t q;
 186 int ret;
 187 unsigned entries;
 188 unsigned int flags = DANE_F_IGNORE_LOCAL_RESOLVER, i;
 189 unsigned int usage, type, match;
 190 gnutls_datum_t data, file;
 191 size_t size;
 192
 193   if (ENABLED_OPT(LOCAL_DNS))
 194     flags = 0;
 195
 196   printf("Querying %s (%s:%d)...\n", host, proto, port);
 197   ret = dane_state_init(&s, flags);
 198   if (ret < 0)
 199     error (EXIT_FAILURE, 0, "dane_state_init: %s", dane_strerror (ret));
 200
 201   ret = dane_query_tlsa(s, &q, host, proto, port);
 202   if (ret < 0)
 203     error (EXIT_FAILURE, 0, "dane_query_tlsa: %s", dane_strerror (ret));
 204
 205   entries = dane_query_entries(q);
 206   for (i=0;i<entries;i++)
 207     {
 208       ret = dane_query_data(q, i, &usage, &type, &match, &data);
 209       if (ret < 0)
 210         error (EXIT_FAILURE, 0, "dane_query_data: %s", dane_strerror (ret));
 211
 212
 213       size = buffer_size;
 214       ret = gnutls_hex_encode(&data, (void*)buffer, &size);
 215       if (ret < 0)
 216         error (EXIT_FAILURE, 0, "gnutls_hex_encode: %s", dane_strerror (ret));
 217
 218       if (entries > 1) printf("\nEntry %d:\n", i+1);
 219
 220       fprintf(outfile, "_%u._%s.%s. IN TLSA ( %.2x %.2x %.2x %s )\n", port, proto, host, usage, type, match, buffer);
 221       printf("Certificate usage: %s (%.2x)\n", dane_cert_usage_name(usage), usage);
 222       printf("Certificate type:  %s (%.2x)\n", dane_cert_type_name(type), type);
 223       printf("Contents:          %s (%.2x)\n", dane_match_type_name(match), match);
 224       printf("Data:              %s\n", buffer);
 225
 226       /* Verify the DANE data */
 227       if (cinfo->cert)
 228         {
 229           gnutls_x509_crt_t *clist;
 230           unsigned int clist_size, status;
 231
 232           ret = gnutls_load_file(cinfo->cert, &file);
 233           if (ret < 0)
 234             error (EXIT_FAILURE, 0, "gnutls_load_file: %s", gnutls_strerror (ret));
 235
 236           ret = gnutls_x509_crt_list_import2( &clist, &clist_size, &file, cinfo->incert_format, 0);
 237           if (ret < 0)
 238             error (EXIT_FAILURE, 0, "gnutls_x509_crt_list_import2: %s", gnutls_strerror (ret));
 239
 240           if (clist_size > 0)
 241             {
 242               gnutls_datum_t certs[clist_size];
 243               gnutls_datum_t out;
 244               unsigned int i;
 245
 246               for (i=0;i<clist_size;i++)
 247                 {
 248                   ret = gnutls_x509_crt_export2( clist[i], GNUTLS_X509_FMT_DER, &certs[i]);
 249                   if (ret < 0)
 250                     error (EXIT_FAILURE, 0, "gnutls_x509_crt_export2: %s", gnutls_strerror (ret));
 251                 }
 252
 253               ret = dane_verify_crt( s, certs, clist_size, GNUTLS_CRT_X509,
 254                                      host, proto, port, 0, 0, &status);
 255               if (ret < 0)
 256                 error (EXIT_FAILURE, 0, "dane_verify_crt: %s", dane_strerror (ret));
 257
 258               ret = dane_verification_status_print(status, &out, 0);
 259               if (ret < 0)
 260                 error (EXIT_FAILURE, 0, "dane_verification_status_print: %s", dane_strerror (ret));
 261
 262               printf("\nVerification: %s\n", out.data);
 263               gnutls_free(out.data);
 264
 265               for (i=0;i<clist_size;i++)
 266                 {
 267                   gnutls_free(certs[i].data);
 268                   gnutls_x509_crt_deinit(clist[i]);
 269                 }
 270               gnutls_free(clist);
 271             }
 272         }
 273     }
 274
 275
 276   dane_query_deinit(q);
 277   dane_state_deinit(s);
 278
 279 }
 280
 281 static void dane_info(const char* host, const char* proto, unsigned int port,
 282                       unsigned int ca, unsigned int local, common_info_st * cinfo)
 283 {
 284   gnutls_pubkey_t pubkey;
 285   gnutls_x509_crt_t crt;
 286   unsigned char digest[64];
 287   gnutls_datum_t t;
 288   int ret;
 289   unsigned int usage, selector, type;
 290   size_t size;
 291
 292   if (proto == NULL)
 293     proto = "tcp";
 294   if (port == 0)
 295     port = 443;
 296
 297   crt = load_cert (0, cinfo);
 298   if (crt != NULL && HAVE_OPT(X509))
 299     {
 300       selector = 0; /* X.509 */
 301
 302       size = buffer_size;
 303       ret = gnutls_x509_crt_export (crt, GNUTLS_X509_FMT_DER, buffer, &size);
 304       if (ret < 0)
 305         error (EXIT_FAILURE, 0, "export error: %s", gnutls_strerror (ret));
 306
 307       gnutls_x509_crt_deinit (crt);
 308     }
 309   else /* use public key only */
 310     {
 311       selector = 1;
 312
 313       ret = gnutls_pubkey_init (&pubkey);
 314       if (ret < 0)
 315         error (EXIT_FAILURE, 0, "pubkey_init: %s", gnutls_strerror (ret));
 316
 317       if (crt != NULL)
 318         {
 319
 320           ret = gnutls_pubkey_import_x509 (pubkey, crt, 0);
 321           if (ret < 0)
 322             {
 323               error (EXIT_FAILURE, 0, "pubkey_import_x509: %s",
 324                      gnutls_strerror (ret));
 325             }
 326
 327           size = buffer_size;
 328           ret = gnutls_pubkey_export (pubkey, GNUTLS_X509_FMT_DER, buffer, &size);
 329           if (ret < 0)
 330             {
 331               error (EXIT_FAILURE, 0, "pubkey_export: %s",
 332                      gnutls_strerror (ret));
 333             }
 334
 335           gnutls_x509_crt_deinit(crt);
 336         }
 337       else
 338         {
 339           pubkey = load_pubkey (1, cinfo);
 340
 341           size = buffer_size;
 342           ret = gnutls_pubkey_export (pubkey, GNUTLS_X509_FMT_DER, buffer, &size);
 343           if (ret < 0)
 344             error (EXIT_FAILURE, 0, "export error: %s", gnutls_strerror (ret));
 345         }
 346
 347       gnutls_pubkey_deinit (pubkey);
 348     }
 349
 350   if (default_dig != GNUTLS_DIG_SHA256 && default_dig != GNUTLS_DIG_SHA512)
 351     {
 352       if (default_dig != GNUTLS_DIG_UNKNOWN) fprintf(stderr, "Unsupported digest. Assuming SHA256.\n");
 353       default_dig = GNUTLS_DIG_SHA256;
 354     }
 355
 356   ret = gnutls_hash_fast(default_dig, buffer, size, digest);
 357   if (ret < 0)
 358     error (EXIT_FAILURE, 0, "hash error: %s", gnutls_strerror (ret));
 359
 360   if (default_dig == GNUTLS_DIG_SHA256)
 361     type = 1;
 362   else type = 2;
 363
 364   /* DANE certificate classification crap */
 365   if (local==0)
 366     {
 367       if (ca) usage = 0;
 368       else usage = 1;
 369     }
 370   else
 371     {
 372       if (ca) usage = 2;
 373       else usage = 3;
 374     }
 375
 376   t.data = digest;
 377   t.size = gnutls_hash_get_len(default_dig);
 378
 379   size = buffer_size;
 380   ret = gnutls_hex_encode(&t, (void*)buffer, &size);
 381   if (ret < 0)
 382     error (EXIT_FAILURE, 0, "hex encode error: %s", gnutls_strerror (ret));
 383
 384   fprintf(outfile, "_%u._%s.%s. IN TLSA ( %.2x %.2x %.2x %s )\n", port, proto, host, usage, selector, type, buffer);
 385
 386 }