src/credential/gnunet-credential.c

   1 /*
   2      This file is part of GNUnet.
   3      Copyright (C) 2012-2013 GNUnet e.V.
   4
   5      GNUnet is free software: you can redistribute it and/or modify it
   6      under the terms of the GNU Affero General Public License as published
   7      by the Free Software Foundation, either version 3 of the License,
   8      or (at your option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      Affero General Public License for more details.
  14
  15      You should have received a copy of the GNU Affero General Public License
  16      along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18      SPDX-License-Identifier: AGPL3.0-or-later
  19  */
  20 /**
  21  * @file gnunet-credential.c
  22  * @brief command line tool to access command line Credential service
  23  * @author Martin Schanzenbach
  24  */
  25 #include "platform.h"
  26 #include <gnunet_util_lib.h>
  27 #include <gnunet_credential_service.h>
  28 #include <gnunet_gnsrecord_lib.h>
  29 #include "credential_misc.h"
  30 #include "credential_serialization.h"
  31
  32 /**
  33  * Configuration we are using.
  34  */
  35 static const struct GNUNET_CONFIGURATION_Handle *cfg;
  36
  37 /**
  38  * EgoLookup
  39  */
  40 static struct GNUNET_IDENTITY_EgoLookup *el;
  41
  42 /**
  43  * Handle to Credential service.
  44  */
  45 static struct GNUNET_CREDENTIAL_Handle *credential;
  46
  47 /**
  48  * Desired timeout for the lookup (default is no timeout).
  49  */
  50 static struct GNUNET_TIME_Relative timeout;
  51
  52 /**
  53  * Handle to verify request
  54  */
  55 static struct GNUNET_CREDENTIAL_Request *verify_request;
  56
  57 /**
  58  * Handle to collect request
  59  */
  60 static struct GNUNET_CREDENTIAL_Request *collect_request;
  61
  62 /**
  63  * Task scheduled to handle timeout.
  64  */
  65 static struct GNUNET_SCHEDULER_Task *tt;
  66
  67 /**
  68  * Subject pubkey string
  69  */
  70 static char *subject_key;
  71
  72 /**
  73  * Subject credential string
  74  */
  75 static char *subject_credential;
  76
  77 /**
  78  * Credential TTL
  79  */
  80 static char *expiration;
  81
  82 /**
  83  * Subject key
  84  */
  85 struct GNUNET_CRYPTO_EcdsaPublicKey subject_pkey;
  86
  87 /**
  88  * Issuer key
  89  */
  90 struct GNUNET_CRYPTO_EcdsaPublicKey issuer_pkey;
  91
  92
  93 /**
  94  * Issuer pubkey string
  95  */
  96 static char *issuer_key;
  97
  98 /**
  99  * ego
 100  */
 101 static char *ego_name;
 102
 103 /**
 104  * Issuer attribute
 105  */
 106 static char *issuer_attr;
 107
 108 /**
 109  * Verify mode
 110  */
 111 static int verify;
 112
 113 /**
 114  * Issue mode
 115  */
 116 static int create_cred;
 117
 118 /**
 119  * Collect mode
 120  */
 121 static int collect;
 122
 123 /**
 124  * Task run on shutdown.  Cleans up everything.
 125  *
 126  * @param cls unused
 127  */
 128 static void
 129 do_shutdown (void *cls)
 130 {
 131   if (NULL != verify_request)
 132   {
 133     GNUNET_CREDENTIAL_request_cancel (verify_request);
 134     verify_request = NULL;
 135   }
 136   if (NULL != credential)
 137   {
 138     GNUNET_CREDENTIAL_disconnect (credential);
 139     credential = NULL;
 140   }
 141   if (NULL != tt)
 142   {
 143     GNUNET_SCHEDULER_cancel (tt);
 144     tt = NULL;
 145   }
 146 }
 147
 148
 149 /**
 150  * Task run on timeout. Triggers shutdown.
 151  *
 152  * @param cls unused
 153  */
 154 static void
 155 do_timeout (void *cls)
 156 {
 157   tt = NULL;
 158   GNUNET_SCHEDULER_shutdown ();
 159 }
 160
 161 static void
 162 handle_collect_result (void *cls,
 163                        unsigned int d_count,
 164                        struct GNUNET_CREDENTIAL_Delegation *dc,
 165                        unsigned int c_count,
 166                        struct GNUNET_CREDENTIAL_Credential *cred)
 167 {
 168   int i;
 169   char*line;
 170
 171   verify_request = NULL;
 172   if (NULL != cred)
 173   {
 174     for (i = 0; i < c_count; i++)
 175     {
 176       line = GNUNET_CREDENTIAL_credential_to_string (&cred[i]);
 177       printf ("%s\n",
 178               line);
 179       GNUNET_free (line);
 180     }
 181   }
 182
 183
 184   GNUNET_SCHEDULER_shutdown ();
 185 }
 186
 187
 188 static void
 189 handle_verify_result (void *cls,
 190                       unsigned int d_count,
 191                       struct GNUNET_CREDENTIAL_Delegation *dc,
 192                       unsigned int c_count,
 193                       struct GNUNET_CREDENTIAL_Credential *cred)
 194 {
 195   int i;
 196   char*iss_key;
 197   char*sub_key;
 198
 199   verify_request = NULL;
 200   if (NULL == cred)
 201     printf ("Failed.\n");
 202   else
 203   {
 204     printf ("Delegation Chain:\n");
 205     for (i = 0; i < d_count; i++)
 206     {
 207       iss_key = GNUNET_CRYPTO_ecdsa_public_key_to_string (&dc[i].issuer_key);
 208       sub_key = GNUNET_CRYPTO_ecdsa_public_key_to_string (&dc[i].subject_key);
 209       if (0 != dc[i].subject_attribute_len)
 210       {
 211         printf ("(%d) %s.%s <- %s.%s\n", i,
 212                 iss_key, dc[i].issuer_attribute,
 213                 sub_key, dc[i].subject_attribute);
 214       }
 215       else
 216       {
 217         printf ("(%d) %s.%s <- %s\n", i,
 218                 iss_key, dc[i].issuer_attribute,
 219                 sub_key);
 220       }
 221       GNUNET_free (iss_key);
 222       GNUNET_free (sub_key);
 223     }
 224     printf ("\nCredentials:\n");
 225     for (i = 0; i < c_count; i++)
 226     {
 227       iss_key = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred[i].issuer_key);
 228       sub_key = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred[i].subject_key);
 229       printf ("%s.%s <- %s\n",
 230               iss_key, cred[i].issuer_attribute,
 231               sub_key);
 232       GNUNET_free (iss_key);
 233       GNUNET_free (sub_key);
 234     }
 235     printf ("Successful.\n");
 236   }
 237
 238
 239   GNUNET_SCHEDULER_shutdown ();
 240 }
 241
 242 /**
 243  * Callback invoked from identity service with ego information.
 244  * An @a ego of NULL means the ego was not found.
 245  *
 246  * @param cls closure with the configuration
 247  * @param ego an ego known to identity service, or NULL
 248  */
 249 static void
 250 identity_cb (void *cls,
 251              const struct GNUNET_IDENTITY_Ego *ego)
 252 {
 253   const struct GNUNET_CRYPTO_EcdsaPrivateKey *privkey;
 254   struct GNUNET_CREDENTIAL_Credential *crd;
 255   struct GNUNET_TIME_Absolute etime_abs;
 256   struct GNUNET_TIME_Relative etime_rel;
 257   char *res;
 258
 259   el = NULL;
 260   if (NULL == ego)
 261   {
 262     if (NULL != ego_name)
 263     {
 264       fprintf (stderr,
 265                _ ("Ego `%s' not known to identity service\n"),
 266                ego_name);
 267     }
 268     GNUNET_SCHEDULER_shutdown ();
 269     return;
 270   }
 271
 272   if (GNUNET_YES == collect)
 273   {
 274     if (GNUNET_OK !=
 275         GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_key,
 276                                                     strlen (issuer_key),
 277                                                     &issuer_pkey))
 278     {
 279       fprintf (stderr,
 280                _ ("Issuer public key `%s' is not well-formed\n"),
 281                issuer_key);
 282       GNUNET_SCHEDULER_shutdown ();
 283     }
 284     privkey = GNUNET_IDENTITY_ego_get_private_key (ego);
 285
 286     collect_request = GNUNET_CREDENTIAL_collect (credential,
 287                                                  &issuer_pkey,
 288                                                  issuer_attr,  // TODO argument
 289                                                  privkey,
 290                                                  &handle_collect_result,
 291                                                  NULL);
 292     return;
 293   }
 294
 295   // Else issue
 296
 297   if (NULL == expiration)
 298   {
 299     fprintf (stderr,
 300              "Please specify a TTL\n");
 301     GNUNET_SCHEDULER_shutdown ();
 302     return;
 303   }
 304   else if (GNUNET_OK == GNUNET_STRINGS_fancy_time_to_relative (expiration,
 305                                                                &etime_rel))
 306   {
 307     etime_abs = GNUNET_TIME_relative_to_absolute (etime_rel);
 308   }
 309   else if (GNUNET_OK != GNUNET_STRINGS_fancy_time_to_absolute (expiration,
 310                                                                &etime_abs))
 311   {
 312     fprintf (stderr,
 313              "%s is not a valid ttl!\n",
 314              expiration);
 315     GNUNET_SCHEDULER_shutdown ();
 316     return;
 317   }
 318
 319
 320   privkey = GNUNET_IDENTITY_ego_get_private_key (ego);
 321   GNUNET_free_non_null (ego_name);
 322   ego_name = NULL;
 323   crd = GNUNET_CREDENTIAL_credential_issue (privkey,
 324                                             &subject_pkey,
 325                                             issuer_attr,
 326                                             &etime_abs);
 327
 328   res = GNUNET_CREDENTIAL_credential_to_string (crd);
 329   GNUNET_free (crd);
 330   printf ("%s\n", res);
 331   GNUNET_SCHEDULER_shutdown ();
 332 }
 333
 334
 335
 336
 337 /**
 338  * Main function that will be run.
 339  *
 340  * @param cls closure
 341  * @param args remaining command-line arguments
 342  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 343  * @param c configuration
 344  */
 345 static void
 346 run (void *cls,
 347      char *const *args,
 348      const char *cfgfile,
 349      const struct GNUNET_CONFIGURATION_Handle *c)
 350 {
 351   cfg = c;
 352
 353
 354   tt = GNUNET_SCHEDULER_add_delayed (timeout,
 355                                      &do_timeout, NULL);
 356   GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
 357
 358   if (GNUNET_YES == collect)
 359   {
 360     if (NULL == issuer_key)
 361     {
 362       fprintf (stderr,
 363                _ ("Issuer public key not well-formed\n"));
 364       GNUNET_SCHEDULER_shutdown ();
 365       return;
 366     }
 367
 368     credential = GNUNET_CREDENTIAL_connect (cfg);
 369
 370     if (NULL == credential)
 371     {
 372       fprintf (stderr,
 373                _ ("Failed to connect to CREDENTIAL\n"));
 374       GNUNET_SCHEDULER_shutdown ();
 375       return;
 376     }
 377     if (NULL == issuer_attr)
 378     {
 379       fprintf (stderr,
 380                _ ("You must provide issuer the attribute\n"));
 381       GNUNET_SCHEDULER_shutdown ();
 382       return;
 383     }
 384
 385     if (NULL == ego_name)
 386     {
 387       fprintf (stderr,
 388                _ ("ego required\n"));
 389       GNUNET_SCHEDULER_shutdown ();
 390       return;
 391     }
 392     el = GNUNET_IDENTITY_ego_lookup (cfg,
 393                                      ego_name,
 394                                      &identity_cb,
 395                                      (void *) cfg);
 396     return;
 397   }
 398
 399   if (NULL == subject_key)
 400   {
 401     fprintf (stderr,
 402              _ ("Subject public key needed\n"));
 403     GNUNET_SCHEDULER_shutdown ();
 404     return;
 405   }
 406   if (GNUNET_OK !=
 407       GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_key,
 408                                                   strlen (subject_key),
 409                                                   &subject_pkey))
 410   {
 411     fprintf (stderr,
 412              _ ("Subject public key `%s' is not well-formed\n"),
 413              subject_key);
 414     GNUNET_SCHEDULER_shutdown ();
 415     return;
 416   }
 417   if (GNUNET_YES == verify)
 418   {
 419     if (NULL == issuer_key)
 420     {
 421       fprintf (stderr,
 422                _ ("Issuer public key not well-formed\n"));
 423       GNUNET_SCHEDULER_shutdown ();
 424       return;
 425     }
 426     if (GNUNET_OK !=
 427         GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_key,
 428                                                     strlen (issuer_key),
 429                                                     &issuer_pkey))
 430     {
 431       fprintf (stderr,
 432                _ ("Issuer public key `%s' is not well-formed\n"),
 433                issuer_key);
 434       GNUNET_SCHEDULER_shutdown ();
 435       return;
 436     }
 437     credential = GNUNET_CREDENTIAL_connect (cfg);
 438
 439     if (NULL == credential)
 440     {
 441       fprintf (stderr,
 442                _ ("Failed to connect to CREDENTIAL\n"));
 443       GNUNET_SCHEDULER_shutdown ();
 444       return;
 445     }
 446     if ((NULL == issuer_attr) ||(NULL == subject_credential) )
 447     {
 448       fprintf (stderr,
 449                _ ("You must provide issuer and subject attributes\n"));
 450       GNUNET_SCHEDULER_shutdown ();
 451       return;
 452     }
 453
 454     // Subject credentials are comma separated
 455     char *tmp = GNUNET_strdup (subject_credential);
 456     char *tok = strtok (tmp, ",");
 457     if (NULL == tok)
 458     {
 459       fprintf (stderr,
 460                "Invalid subject credentials\n");
 461       GNUNET_free (tmp);
 462       GNUNET_SCHEDULER_shutdown ();
 463       return;
 464     }
 465     int count = 1;
 466     int i;
 467     while (NULL != (tok = strtok (NULL, ",")))
 468       count++;
 469     struct GNUNET_CREDENTIAL_Credential credentials[count];
 470     struct GNUNET_CREDENTIAL_Credential *cred;
 471     GNUNET_free (tmp);
 472     tmp = GNUNET_strdup (subject_credential);
 473     tok = strtok (tmp, ",");
 474     for (i = 0; i < count; i++)
 475     {
 476       cred = GNUNET_CREDENTIAL_credential_from_string (tok);
 477       GNUNET_memcpy (&credentials[i],
 478                      cred,
 479                      sizeof(struct GNUNET_CREDENTIAL_Credential));
 480       credentials[i].issuer_attribute = GNUNET_strdup (cred->issuer_attribute);
 481       tok = strtok (NULL, ",");
 482       GNUNET_free (cred);
 483     }
 484
 485     verify_request = GNUNET_CREDENTIAL_verify (credential,
 486                                                &issuer_pkey,
 487                                                issuer_attr,  // TODO argument
 488                                                &subject_pkey,
 489                                                count,
 490                                                credentials,
 491                                                &handle_verify_result,
 492                                                NULL);
 493     for (i = 0; i < count; i++)
 494     {
 495       GNUNET_free ((char*) credentials[i].issuer_attribute);
 496     }
 497     GNUNET_free (tmp);
 498   }
 499   else if (GNUNET_YES == create_cred)
 500   {
 501     if (NULL == ego_name)
 502     {
 503       fprintf (stderr,
 504                _ ("Issuer ego required\n"));
 505       GNUNET_SCHEDULER_shutdown ();
 506       return;
 507     }
 508     el = GNUNET_IDENTITY_ego_lookup (cfg,
 509                                      ego_name,
 510                                      &identity_cb,
 511                                      (void *) cfg);
 512     return;
 513   }
 514   else
 515   {
 516     fprintf (stderr,
 517              _ (
 518                "Please specify name to lookup, subject key and issuer key!\n"));
 519     GNUNET_SCHEDULER_shutdown ();
 520   }
 521   return;
 522 }
 523
 524
 525 /**
 526  * The main function for gnunet-gns.
 527  *
 528  * @param argc number of arguments from the command line
 529  * @param argv command line arguments
 530  * @return 0 ok, 1 on error
 531  */
 532 int
 533 main (int argc, char *const *argv)
 534 {
 535   struct GNUNET_GETOPT_CommandLineOption options[] = {
 536     GNUNET_GETOPT_option_flag ('I',
 537                                "issue",
 538                                gettext_noop ("create credential"),
 539                                &create_cred),
 540     GNUNET_GETOPT_option_flag ('V',
 541                                "verify",
 542                                gettext_noop (
 543                                  "verify credential against attribute"),
 544                                &verify),
 545     GNUNET_GETOPT_option_string ('s',
 546                                  "subject",
 547                                  "PKEY",
 548                                  gettext_noop (
 549                                    "The public key of the subject to lookup the credential for"),
 550                                  &subject_key),
 551     GNUNET_GETOPT_option_string ('b',
 552                                  "credential",
 553                                  "CRED",
 554                                  gettext_noop (
 555                                    "The name of the credential presented by the subject"),
 556                                  &subject_credential),
 557     GNUNET_GETOPT_option_string ('i',
 558                                  "issuer",
 559                                  "PKEY",
 560                                  gettext_noop (
 561                                    "The public key of the authority to verify the credential against"),
 562                                  &issuer_key),
 563     GNUNET_GETOPT_option_string ('e',
 564                                  "ego",
 565                                  "EGO",
 566                                  gettext_noop ("The ego to use"),
 567                                  &ego_name),
 568     GNUNET_GETOPT_option_string ('a',
 569                                  "attribute",
 570                                  "ATTR",
 571                                  gettext_noop (
 572                                    "The issuer attribute to verify against or to issue"),
 573                                  &issuer_attr),
 574     GNUNET_GETOPT_option_string ('T',
 575                                  "ttl",
 576                                  "EXP",
 577                                  gettext_noop (
 578                                    "The time to live for the credential"),
 579                                  &expiration),
 580     GNUNET_GETOPT_option_flag ('g',
 581                                "collect",
 582                                gettext_noop ("collect credentials"),
 583                                &collect),
 584     GNUNET_GETOPT_OPTION_END
 585   };
 586   int ret;
 587
 588   timeout = GNUNET_TIME_UNIT_FOREVER_REL;
 589   if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
 590     return 2;
 591
 592   GNUNET_log_setup ("gnunet-credential", "WARNING", NULL);
 593   ret =
 594     (GNUNET_OK ==
 595      GNUNET_PROGRAM_run (argc, argv, "gnunet-credential",
 596                          _ ("GNUnet credential resolver tool"),
 597                          options,
 598                          &run, NULL)) ? 0 : 1;
 599   GNUNET_free ((void*) argv);
 600   return ret;
 601 }
 602
 603 /* end of gnunet-credential.c */