C++ (Cpp) ssh_options_set_algo Examples

Example #1

File: server.c Project: alejom200/tmate

static int server_set_kex(ssh_session session) {
  struct ssh_kex_struct *server = &session->next_crypto->server_kex;
  int i, j, rc;
  const char *wanted;
  char hostkeys[64] = {0};
  enum ssh_keytypes_e keytype;
  size_t len;

  ZERO_STRUCTP(server);
  ssh_get_random(server->cookie, 16, 0);

#ifdef HAVE_ECC
  if (session->srv.ecdsa_key != NULL) {
      snprintf(hostkeys, sizeof(hostkeys),
               "%s", session->srv.ecdsa_key->type_c);
  }
#endif
  if (session->srv.dsa_key != NULL) {
      len = strlen(hostkeys);
      keytype = ssh_key_type(session->srv.dsa_key);

      snprintf(hostkeys + len, sizeof(hostkeys) - len,
               ",%s", ssh_key_type_to_char(keytype));
  }
  if (session->srv.rsa_key != NULL) {
      len = strlen(hostkeys);
      keytype = ssh_key_type(session->srv.rsa_key);

      snprintf(hostkeys + len, sizeof(hostkeys) - len,
               ",%s", ssh_key_type_to_char(keytype));
  }

  if (strlen(hostkeys) == 0) {
      return -1;
  }

  rc = ssh_options_set_algo(session,
                            SSH_HOSTKEYS,
                            hostkeys[0] == ',' ? hostkeys + 1 : hostkeys);
  if (rc < 0) {
      return -1;
  }

  for (i = 0; i < 10; i++) {
    if ((wanted = session->opts.wanted_methods[i]) == NULL) {
      wanted = ssh_kex_get_supported_method(i);
    }
    server->methods[i] = strdup(wanted);
    if (server->methods[i] == NULL) {
      for (j = 0; j < i; j++) {
        SAFE_FREE(server->methods[j]);
      }
      return -1;
    }
  }

  return 0;
}

Example #2

File: server.c Project: imeckler/Watch

static int server_set_kex(ssh_session session) {
  KEX *server = &session->server_kex;
  int i, j;
  char *wanted;

  ZERO_STRUCTP(server);
  ssh_get_random(server->cookie, 16, 0);
  if (session->dsa_key != NULL && session->rsa_key != NULL) {
    if (ssh_options_set_algo(session, SSH_HOSTKEYS,
          "ssh-dss,ssh-rsa") < 0) {
      return -1;
    }
  } else if (session->dsa_key != NULL) {
    if (ssh_options_set_algo(session, SSH_HOSTKEYS, "ssh-dss") < 0) {
      return -1;
    }
  } else {
    if (ssh_options_set_algo(session, SSH_HOSTKEYS, "ssh-rsa") < 0) {
      return -1;
    }
  }

  server->methods = (char **) malloc(10 * sizeof(char **));
  if (server->methods == NULL) {
    return -1;
  }

  for (i = 0; i < 10; i++) {
    if ((wanted = session->wanted_methods[i]) == NULL) {
      wanted = supported_methods[i];
    }
    server->methods[i] = strdup(wanted);
    if (server->methods[i] == NULL) {
      for (j = i - 1; j <= 0; j--) {
        SAFE_FREE(server->methods[j]);
      }
      SAFE_FREE(server->methods);
      return -1;
    }
  }

  return 0;
}

Example #3

File: server.c Project: simonsj/libssh

int server_set_kex(ssh_session session)
{
  struct ssh_kex_struct *server = &session->next_crypto->server_kex;
  int i, j, rc;
  const char *wanted;
  char hostkeys[128] = {0};
  enum ssh_keytypes_e keytype;
  size_t len;
  int ok;

  ZERO_STRUCTP(server);

  ok = ssh_get_random(server->cookie, 16, 0);
  if (!ok) {
      ssh_set_error(session, SSH_FATAL, "PRNG error");
      return -1;
  }

  if (session->srv.ed25519_key != NULL) {
      snprintf(hostkeys,
               sizeof(hostkeys),
               "%s",
               ssh_key_type_to_char(ssh_key_type(session->srv.ed25519_key)));
  }
#ifdef HAVE_ECC
  if (session->srv.ecdsa_key != NULL) {
	  len = strlen(hostkeys);
      snprintf(hostkeys + len, sizeof(hostkeys) - len,
               ",%s", session->srv.ecdsa_key->type_c);
  }
#endif
#ifdef HAVE_DSA
  if (session->srv.dsa_key != NULL) {
      len = strlen(hostkeys);
      keytype = ssh_key_type(session->srv.dsa_key);

      snprintf(hostkeys + len, sizeof(hostkeys) - len,
               ",%s", ssh_key_type_to_char(keytype));
  }
#endif
  if (session->srv.rsa_key != NULL) {
      /* We support also the SHA2 variants */
      len = strlen(hostkeys);
      snprintf(hostkeys + len, sizeof(hostkeys) - len,
               ",rsa-sha2-512,rsa-sha2-256");

      len = strlen(hostkeys);
      keytype = ssh_key_type(session->srv.rsa_key);

      snprintf(hostkeys + len, sizeof(hostkeys) - len,
               ",%s", ssh_key_type_to_char(keytype));
  }

  if (strlen(hostkeys) == 0) {
      return -1;
  }

  rc = ssh_options_set_algo(session,
                            SSH_HOSTKEYS,
                            hostkeys[0] == ',' ? hostkeys + 1 : hostkeys);
  if (rc < 0) {
      return -1;
  }

  for (i = 0; i < 10; i++) {
    if ((wanted = session->opts.wanted_methods[i]) == NULL) {
      wanted = ssh_kex_get_supported_method(i);
    }
    server->methods[i] = strdup(wanted);
    if (server->methods[i] == NULL) {
      for (j = 0; j < i; j++) {
        SAFE_FREE(server->methods[j]);
      }
      return -1;
    }
  }

  return 0;
}