gnunet-identity.c

Go to the documentation of this file.

/*
     This file is part of GNUnet.
     Copyright (C) 2013, 2018, 2019 GNUnet e.V.
 
     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.
 
     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.
 
     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
     SPDX-License-Identifier: AGPL3.0-or-later
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_identity_service.h"
 
 
#define TIMEOUT_STATUS_CODE 40
 
static struct GNUNET_IDENTITY_Handle *sh;
 
static int list;
 
static int monitor;
 
static int private_keys;
 
static unsigned int verbose;
 
static int quiet;
 
static int type_eddsa;
 
static char *write_msg;
 
static char *read_msg;
 
static char *create_ego;
 
static char *delete_ego;
 
static char *privkey_ego;
 
static char *pubkey_msg;
 
static char *set_ego;
 
static struct GNUNET_IDENTITY_Operation *set_op;
 
static struct GNUNET_IDENTITY_Operation *create_op;
 
static struct GNUNET_IDENTITY_Operation *delete_op;
 
struct GNUNET_IDENTITY_PrivateKey pk;
 
static int global_ret;
 
 
static void
shutdown_task (void *cls)
{
  if (NULL != set_op)
  {
    GNUNET_IDENTITY_cancel (set_op);
    set_op = NULL;
  }
  if (NULL != create_op)
  {
    GNUNET_IDENTITY_cancel (create_op);
    create_op = NULL;
  }
  if (NULL != delete_op)
  {
    GNUNET_IDENTITY_cancel (delete_op);
    delete_op = NULL;
  }
  if (NULL != set_ego)
  {
    GNUNET_free (set_ego);
    set_ego = NULL;
  }
  GNUNET_IDENTITY_disconnect (sh);
  sh = NULL;
}
 
 
static void
test_finished (void)
{
  if ( (NULL == create_op) &&
       (NULL == delete_op) &&
       (NULL == set_op) &&
       (NULL == write_msg) &&
       (NULL == read_msg) &&
       (! list) &&
       (! monitor))
  {
    if (TIMEOUT_STATUS_CODE == global_ret)
      global_ret = 0;
    GNUNET_SCHEDULER_shutdown ();
  }
}
 
 
static void
delete_finished (void *cls,
                 enum GNUNET_ErrorCode ec)
{
  struct GNUNET_IDENTITY_Operation **op = cls;
 
  *op = NULL;
  if (GNUNET_EC_NONE != ec)
    fprintf (stderr, "%s\n", GNUNET_ErrorCode_get_hint (ec));
  test_finished ();
}
 
 
static void
create_finished (void *cls,
                 const struct GNUNET_IDENTITY_PrivateKey *pk,
                 enum GNUNET_ErrorCode ec)
{
  struct GNUNET_IDENTITY_Operation **op = cls;
 
  *op = NULL;
  if (NULL == pk)
  {
    fprintf (stderr,
             _ ("Failed to create ego: %s\n"),
             GNUNET_ErrorCode_get_hint (ec));
    global_ret = 1;
  }
  else if (verbose)
  {
    struct GNUNET_IDENTITY_PublicKey pub;
    char *pubs;
 
    GNUNET_IDENTITY_key_get_public (pk, &pub);
    pubs = GNUNET_IDENTITY_public_key_to_string (&pub);
    if (private_keys)
    {
      char *privs;
 
      privs = GNUNET_IDENTITY_private_key_to_string (pk);
      fprintf (stdout, "%s - %s\n", pubs, privs);
      GNUNET_free (privs);
    }
    else
    {
      fprintf (stdout, "%s\n", pubs);
    }
    GNUNET_free (pubs);
  }
  test_finished ();
}
 
 
static void
write_encrypted_message (void)
{
  struct GNUNET_IDENTITY_PublicKey recipient;
  if (GNUNET_IDENTITY_public_key_from_string (pubkey_msg, &recipient) !=
      GNUNET_SYSERR)
  {
    struct GNUNET_CRYPTO_EcdhePublicKey message_key;
    size_t msg_len = strlen (write_msg) + 1;
    ssize_t res = GNUNET_IDENTITY_encrypt (write_msg,
                                           msg_len,
                                           &recipient,
                                           &message_key,
                                           write_msg);
    if (-1 != res)
    {
      char *keystr;
      char *serialized_msg;
      keystr = GNUNET_STRINGS_data_to_string_alloc (&message_key,
                                                    sizeof(struct
                                                           GNUNET_CRYPTO_EcdhePublicKey));
      serialized_msg = GNUNET_STRINGS_data_to_string_alloc (write_msg,
                                                            msg_len);
      fprintf (stdout,
               "%s.%s\n",
               keystr, serialized_msg);
      GNUNET_free (keystr);
      GNUNET_free (serialized_msg);
    }
    else
    {
      fprintf (stderr, "Error during encryption.\n");
      global_ret = 1;
    }
  }
  else
  {
    fprintf (stderr, "Invalid recipient public key.\n");
    global_ret = 1;
  }
}
 
 
static void
read_encrypted_message (struct GNUNET_IDENTITY_Ego *ego)
{
  // message contains ECDHE key and ciphertext divided by ".", so split up first
  char delim[2] = ".";
  char *key_msg = strtok (read_msg, delim);
  char *cipher;
  if (NULL == key_msg)
  {
    fprintf (stderr, "Invalid message format.\n");
    global_ret = 1;
    return;
  }
  cipher = strtok (NULL, delim);
  if (NULL == cipher)
  {
    fprintf (stderr, "Invalid message format, text missing.\n");
    global_ret = 1;
    return;
  }
 
  if (NULL != strtok (NULL, delim))
  {
    fprintf (stderr,
             "Invalid message format, expecting only key and cipher components.\n");
    global_ret = 1;
    return;
  }
 
  struct GNUNET_CRYPTO_EcdhePublicKey message_key;
  if (GNUNET_OK == GNUNET_STRINGS_string_to_data (key_msg, strlen (
                                                    key_msg),
                                                  &message_key,
                                                  sizeof(message_key)))
  {
    char *deserialized_msg;
    size_t msg_len;
    if (GNUNET_OK == GNUNET_STRINGS_string_to_data_alloc (cipher, strlen (
                                                            cipher),
                                                          (void **) &
                                                          deserialized_msg,
                                                          &msg_len))
    {
      ssize_t res = GNUNET_IDENTITY_decrypt (deserialized_msg,
                                             msg_len,
                                             GNUNET_IDENTITY_ego_get_private_key (
                                               ego),
                                             &message_key,
                                             deserialized_msg);
      if (-1 != res)
      {
        deserialized_msg[res - 1] = '\0';
        fprintf (stdout,
                 "%s\n",
                 deserialized_msg);
      }
      else
      {
        fprintf (stderr, "Failed to decrypt message.\n");
        global_ret = 1;
      }
      GNUNET_free (deserialized_msg);
    }
    else
    {
      fprintf (stderr, "Invalid message format.\n");
      global_ret = 1;
    }
  }
  else
  {
    fprintf (stderr, "Invalid message ephemeral key.\n");
    global_ret = 1;
  }
}
 
 
static void
print_ego (void *cls,
           struct GNUNET_IDENTITY_Ego *ego,
           void **ctx,
           const char *identifier)
{
  struct GNUNET_IDENTITY_PublicKey pk;
  char *s;
  char *privs;
 
  if ( (NULL == ego) &&
       (NULL != set_ego) &&
       (NULL != read_msg) )
  {
    fprintf (stderr,
             "Ego `%s' is not known, cannot decrypt message.\n",
             set_ego);
    GNUNET_free (read_msg);
    read_msg = NULL;
    GNUNET_free (set_ego);
    set_ego = NULL;
  }
  if ((NULL == ego) && (! monitor))
  {
    list = 0;
    test_finished ();
    return;
  }
  if (! (list | monitor) && (NULL == read_msg))
    return;
  if ( (NULL == ego) ||
       (NULL == identifier) )
    return;
  if ( (NULL != set_ego) &&
       (0 != strcmp (identifier,
                     set_ego)) )
    return;
  GNUNET_IDENTITY_ego_get_public_key (ego, &pk);
  s = GNUNET_IDENTITY_public_key_to_string (&pk);
  privs = GNUNET_IDENTITY_private_key_to_string (
    GNUNET_IDENTITY_ego_get_private_key (ego));
  if ((NULL != read_msg) && (NULL != set_ego))
  {
    // due to the check above, set_ego and the identifier are equal
    read_encrypted_message (ego);
    GNUNET_free (read_msg);
    read_msg = NULL;
  }
  else if ((monitor) || (NULL != identifier))
  {
    if (quiet)
    {
      if (private_keys)
        fprintf (stdout, "%s - %s\n", s, privs);
      else
        fprintf (stdout, "%s\n", s);
    }
    else
    {
      if (private_keys)
        fprintf (stdout, "%s - %s - %s - %s\n",
                 identifier, s, privs,
                 (ntohl (pk.type) == GNUNET_IDENTITY_TYPE_ECDSA) ?
                 "ECDSA" : "EdDSA");
      else
        fprintf (stdout, "%s - %s - %s\n",
                 identifier, s,
                 (ntohl (pk.type) == GNUNET_IDENTITY_TYPE_ECDSA) ?
                 "ECDSA" : "EdDSA");
 
    }
  }
  GNUNET_free (privs);
  GNUNET_free (s);
}
 
 
static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  if ((NULL != read_msg) && (NULL == set_ego))
  {
    fprintf (stderr,
             "Option -R requires options -e to be specified as well.\n");
    return;
  }
 
  if ((NULL != write_msg) && (NULL == pubkey_msg))
  {
    fprintf (stderr, "Option -W requires option -k to be specified as well.\n");
    return;
  }
  sh = GNUNET_IDENTITY_connect (cfg,
                                (monitor | list) ||
                                (NULL != set_ego)
                                ? &print_ego
                                : NULL,
                                NULL);
  if (NULL != write_msg)
  {
    write_encrypted_message ();
    GNUNET_free (write_msg);
    write_msg = NULL;
  }
  // read message is handled in ego callback (print_ego)
  if (NULL != delete_ego)
    delete_op =
      GNUNET_IDENTITY_delete (sh,
                              delete_ego,
                              &delete_finished,
                              &delete_op);
  if (NULL != create_ego)
  {
    if (NULL != privkey_ego)
    {
      GNUNET_STRINGS_string_to_data (privkey_ego,
                                     strlen (privkey_ego),
                                     &pk,
                                     sizeof(struct
                                            GNUNET_IDENTITY_PrivateKey));
      create_op =
        GNUNET_IDENTITY_create (sh,
                                create_ego,
                                &pk,
                                0, // Ignored
                                &create_finished,
                                &create_op);
    }
    else
      create_op =
        GNUNET_IDENTITY_create (sh,
                                create_ego,
                                NULL,
                                (type_eddsa) ?
                                GNUNET_IDENTITY_TYPE_EDDSA :
                                GNUNET_IDENTITY_TYPE_ECDSA,
                                &create_finished,
                                &create_op);
  }
  GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
                                 NULL);
  test_finished ();
}
 
 
int
main (int argc, char *const *argv)
{
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_string ('C',
                                 "create",
                                 "NAME",
                                 gettext_noop ("create ego NAME"),
                                 &create_ego),
    GNUNET_GETOPT_option_string ('D',
                                 "delete",
                                 "NAME",
                                 gettext_noop ("delete ego NAME "),
                                 &delete_ego),
    GNUNET_GETOPT_option_string ('P',
                                 "privkey",
                                 "PRIVATE_KEY",
                                 gettext_noop (
                                   "set the private key for the identity to PRIVATE_KEY (use together with -C)"),
                                 &privkey_ego),
    GNUNET_GETOPT_option_string ('R',
                                 "read",
                                 "MESSAGE",
                                 gettext_noop (
                                   "Read and decrypt message encrypted for the given ego (use together with -e EGO)"),
                                 &read_msg),
    GNUNET_GETOPT_option_string ('W',
                                 "write",
                                 "MESSAGE",
                                 gettext_noop (
                                   "Encrypt and write message for recipient identity PULBIC_KEY, (use together with -k RECIPIENT_PUBLIC_KEY)"),
                                 &write_msg),
    GNUNET_GETOPT_option_flag ('X',
                               "eddsa",
                               gettext_noop (
                                 "generate an EdDSA identity. (use together with -C) EXPERIMENTAL"),
                               &type_eddsa),
    GNUNET_GETOPT_option_flag ('d',
                               "display",
                               gettext_noop ("display all egos"),
                               &list),
    GNUNET_GETOPT_option_flag ('q',
                               "quiet",
                               gettext_noop ("reduce output"),
                               &quiet),
    GNUNET_GETOPT_option_string (
      'e',
      "ego",
      "NAME",
      gettext_noop (
        "restrict results to NAME (use together with -d) or read and decrypt a message for NAME (use together with -R)"),
      &set_ego),
    GNUNET_GETOPT_option_string ('k',
                                 "key",
                                 "PUBLIC_KEY",
                                 gettext_noop (
                                   "The public key of the recipient (with -W)"),
                                 &pubkey_msg),
    GNUNET_GETOPT_option_flag ('m',
                               "monitor",
                               gettext_noop ("run in monitor mode egos"),
                               &monitor),
    GNUNET_GETOPT_option_flag ('p',
                               "private-keys",
                               gettext_noop ("display private keys as well"),
                               &private_keys),
    GNUNET_GETOPT_option_verbose (&verbose),
    GNUNET_GETOPT_OPTION_END
  };
  int res;
 
  if (GNUNET_OK !=
      GNUNET_STRINGS_get_utf8_args (argc, argv,
                                    &argc, &argv))
    return 4;
  global_ret = TIMEOUT_STATUS_CODE; /* timeout */
  res = GNUNET_PROGRAM_run (argc,
                            argv,
                            "gnunet-identity",
                            gettext_noop ("Maintain egos"),
                            options,
                            &run,
                            NULL);
  GNUNET_free_nz ((void *) argv);
 
  if (GNUNET_OK != res)
    return 3;
  return global_ret;
}
 
 
/* end of gnunet-identity.c */