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
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 3, or (at your
   8      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      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18      Boston, MA 02110-1301, USA.
  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       } else {
 215         printf ("(%d) %s.%s <- %s\n", i,
 216                 iss_key, dc[i].issuer_attribute,
 217                 sub_key);
 218       }
 219       GNUNET_free (iss_key);
 220       GNUNET_free (sub_key);
 221     }
 222     printf("\nCredentials:\n");
 223     for (i=0;i<c_count;i++)
 224     {
 225       iss_key = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred[i].issuer_key);
 226       sub_key = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred[i].subject_key);
 227       printf ("%s.%s <- %s\n",
 228               iss_key, cred[i].issuer_attribute,
 229               sub_key);
 230       GNUNET_free (iss_key);
 231       GNUNET_free (sub_key);
 232
 233     }
 234     printf ("Successful.\n");
 235   }
 236
 237
 238   GNUNET_SCHEDULER_shutdown ();
 239 }
 240
 241 /**
 242  * Callback invoked from identity service with ego information.
 243  * An @a ego of NULL means the ego was not found.
 244  *
 245  * @param cls closure with the configuration
 246  * @param ego an ego known to identity service, or NULL
 247  */
 248 static void
 249 identity_cb (void *cls,
 250              const struct GNUNET_IDENTITY_Ego *ego)
 251 {
 252   const struct GNUNET_CRYPTO_EcdsaPrivateKey *privkey;
 253   struct GNUNET_CREDENTIAL_Credential *crd;
 254   struct GNUNET_TIME_Absolute etime_abs;
 255   struct GNUNET_TIME_Relative etime_rel;
 256   char *res;
 257
 258   el = NULL;
 259   if (NULL == ego)
 260   {
 261     if (NULL != ego_name)
 262     {
 263       fprintf (stderr,
 264                _("Ego `%s' not known to identity service\n"),
 265                ego_name);
 266     }
 267     GNUNET_SCHEDULER_shutdown ();
 268     return;
 269   }
 270
 271   if (GNUNET_YES == collect)
 272   {
 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   } else if (GNUNET_OK == GNUNET_STRINGS_fancy_time_to_relative (expiration,
 304                                                                  &etime_rel))
 305   {
 306     etime_abs = GNUNET_TIME_relative_to_absolute (etime_rel);
 307   } else if (GNUNET_OK != GNUNET_STRINGS_fancy_time_to_absolute (expiration,
 308                                                                  &etime_abs))
 309   {
 310     fprintf (stderr,
 311              "%s is not a valid ttl!\n",
 312              expiration);
 313     GNUNET_SCHEDULER_shutdown ();
 314     return;
 315   }
 316
 317
 318   privkey = GNUNET_IDENTITY_ego_get_private_key (ego);
 319   GNUNET_free_non_null (ego_name);
 320   ego_name = NULL;
 321   crd = GNUNET_CREDENTIAL_credential_issue (privkey,
 322                                             &subject_pkey,
 323                                             issuer_attr,
 324                                             &etime_abs);
 325
 326   res = GNUNET_CREDENTIAL_credential_to_string (crd);
 327   GNUNET_free (crd);
 328   printf ("%s\n", res);
 329   GNUNET_SCHEDULER_shutdown ();
 330 }
 331
 332
 333
 334
 335 /**
 336  * Main function that will be run.
 337  *
 338  * @param cls closure
 339  * @param args remaining command-line arguments
 340  * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 341  * @param c configuration
 342  */
 343 static void
 344 run (void *cls,
 345      char *const *args,
 346      const char *cfgfile,
 347      const struct GNUNET_CONFIGURATION_Handle *c)
 348 {
 349
 350   cfg = c;
 351
 352
 353   tt = GNUNET_SCHEDULER_add_delayed (timeout,
 354                                      &do_timeout, NULL);
 355   GNUNET_SCHEDULER_add_shutdown (&do_shutdown, NULL);
 356
 357   if (GNUNET_YES == collect) {
 358     if (NULL == issuer_key)
 359     {
 360       fprintf (stderr,
 361                _("Issuer public key not well-formed\n"));
 362       GNUNET_SCHEDULER_shutdown ();
 363       return;
 364
 365     }
 366
 367     credential = GNUNET_CREDENTIAL_connect (cfg);
 368
 369     if (NULL == credential)
 370     {
 371       fprintf (stderr,
 372                _("Failed to connect to CREDENTIAL\n"));
 373       GNUNET_SCHEDULER_shutdown ();
 374     }
 375     if (NULL == issuer_attr)
 376     {
 377       fprintf (stderr,
 378                _("You must provide issuer the attribute\n"));
 379       GNUNET_SCHEDULER_shutdown ();
 380     }
 381
 382     if (NULL == ego_name)
 383     {
 384       fprintf (stderr,
 385                _("ego required\n"));
 386       GNUNET_SCHEDULER_shutdown ();
 387       return;
 388
 389     }
 390     el = GNUNET_IDENTITY_ego_lookup (cfg,
 391                                      ego_name,
 392                                      &identity_cb,
 393                                      (void *) cfg);
 394     return;
 395
 396   }
 397
 398   if (NULL == subject_key)
 399   {
 400     fprintf (stderr,
 401              _("Subject public key needed\n"));
 402     GNUNET_SCHEDULER_shutdown ();
 403     return;
 404
 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     if (NULL == issuer_key)
 419     {
 420       fprintf (stderr,
 421                _("Issuer public key not well-formed\n"));
 422       GNUNET_SCHEDULER_shutdown ();
 423       return;
 424
 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     }
 436     credential = GNUNET_CREDENTIAL_connect (cfg);
 437
 438     if (NULL == credential)
 439     {
 440       fprintf (stderr,
 441                _("Failed to connect to CREDENTIAL\n"));
 442       GNUNET_SCHEDULER_shutdown ();
 443     }
 444     if (NULL == issuer_attr || NULL == subject_credential)
 445     {
 446       fprintf (stderr,
 447                _("You must provide issuer and subject attributes\n"));
 448       GNUNET_SCHEDULER_shutdown ();
 449     }
 450
 451     //Subject credentials are comma separated
 452     char *tmp = GNUNET_strdup (subject_credential);
 453     char *tok = strtok (tmp, ",");
 454     if (NULL == tok)
 455     {
 456       fprintf (stderr,
 457                "Invalid subject credentials\n");
 458       GNUNET_free (tmp);
 459       GNUNET_SCHEDULER_shutdown ();
 460     }
 461     int count = 1;
 462     int i;
 463     while (NULL != (tok = strtok(NULL, ",")))
 464       count++;
 465     struct GNUNET_CREDENTIAL_Credential credentials[count];
 466     struct GNUNET_CREDENTIAL_Credential *cred;
 467     GNUNET_free (tmp);
 468     tmp = GNUNET_strdup (subject_credential);
 469     tok = strtok (tmp, ",");
 470     for (i=0;i<count;i++)
 471     {
 472       cred = GNUNET_CREDENTIAL_credential_from_string (tok);
 473       GNUNET_memcpy (&credentials[i],
 474                      cred,
 475                      sizeof (struct GNUNET_CREDENTIAL_Credential));
 476       credentials[i].issuer_attribute = GNUNET_strdup (cred->issuer_attribute);
 477       tok = strtok(NULL, ",");
 478       GNUNET_free (cred);
 479     }
 480
 481     verify_request = GNUNET_CREDENTIAL_verify(credential,
 482                                               &issuer_pkey,
 483                                               issuer_attr, //TODO argument
 484                                               &subject_pkey,
 485                                               count,
 486                                               credentials,
 487                                               &handle_verify_result,
 488                                               NULL);
 489     for (i=0;i<count;i++)
 490     {
 491       GNUNET_free ((char*)credentials[i].issuer_attribute);
 492     }
 493   } else if (GNUNET_YES == create_cred) {
 494     if (NULL == ego_name)
 495     {
 496       fprintf (stderr,
 497                _("Issuer ego required\n"));
 498       GNUNET_SCHEDULER_shutdown ();
 499       return;
 500
 501     }
 502     el = GNUNET_IDENTITY_ego_lookup (cfg,
 503                                      ego_name,
 504                                      &identity_cb,
 505                                      (void *) cfg);
 506     return;
 507   } else {
 508     fprintf (stderr,
 509              _("Please specify name to lookup, subject key and issuer key!\n"));
 510     GNUNET_SCHEDULER_shutdown ();
 511   }
 512   return;
 513 }
 514
 515
 516 /**
 517  * The main function for gnunet-gns.
 518  *
 519  * @param argc number of arguments from the command line
 520  * @param argv command line arguments
 521  * @return 0 ok, 1 on error
 522  */
 523 int
 524 main (int argc, char *const *argv)
 525 {
 526   struct GNUNET_GETOPT_CommandLineOption options[] = {
 527     GNUNET_GETOPT_option_flag ('I',
 528                                "issue",
 529                                gettext_noop ("create credential"),
 530                                &create_cred),
 531     GNUNET_GETOPT_option_flag ('V',
 532                                "verify",
 533                                gettext_noop ("verify credential against attribute"),
 534                                &verify),
 535     GNUNET_GETOPT_option_string ('s',
 536                                  "subject",
 537                                  "PKEY",
 538                                  gettext_noop ("The public key of the subject to lookup the credential for"),
 539                                  &subject_key),
 540     GNUNET_GETOPT_option_string ('b',
 541                                  "credential",
 542                                  "CRED",
 543                                  gettext_noop ("The name of the credential presented by the subject"),
 544                                  &subject_credential),
 545     GNUNET_GETOPT_option_string ('i',
 546                                  "issuer",
 547                                  "PKEY",
 548                                  gettext_noop ("The public key of the authority to verify the credential against"),
 549                                  &issuer_key),
 550     GNUNET_GETOPT_option_string ('e',
 551                                  "ego",
 552                                  "EGO",
 553                                  gettext_noop ("The ego to use"),
 554                                  &ego_name),
 555     GNUNET_GETOPT_option_string ('a',
 556                                  "attribute",
 557                                  "ATTR",
 558                                  gettext_noop ("The issuer attribute to verify against or to issue"),
 559                                  &issuer_attr),
 560     GNUNET_GETOPT_option_string ('T',
 561                                  "ttl",
 562                                  "EXP",
 563                                  gettext_noop ("The time to live for the credential"),
 564                                  &expiration),
 565     GNUNET_GETOPT_option_flag ('g',
 566                                "collect",
 567                                gettext_noop ("collect credentials"),
 568                                &collect),
 569     GNUNET_GETOPT_OPTION_END
 570   };
 571   int ret;
 572
 573   timeout = GNUNET_TIME_UNIT_FOREVER_REL;
 574   if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
 575     return 2;
 576
 577   GNUNET_log_setup ("gnunet-credential", "WARNING", NULL);
 578   ret =
 579     (GNUNET_OK ==
 580      GNUNET_PROGRAM_run (argc, argv, "gnunet-credential",
 581                          _("GNUnet credential resolver tool"),
 582                          options,
 583                          &run, NULL)) ? 0 : 1;
 584   GNUNET_free ((void*) argv);
 585   return ret;
 586 }
 587
 588 /* end of gnunet-credential.c */