empathy-sasl-mechanisms.c 10.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138
/*
 * empathy-sasl-mechanisms.h - Header for SASL authentication mechanisms
 * Copyright (C) 2012 Collabora Ltd.
 * @author Xavier Claessens <xavier.claessens@collabora.co.uk>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <string.h>

#include "empathy-debug.h"
#include "empathy-utils.h"
#include "empathy-sasl-mechanisms.h"

#define MECH_FACEBOOK "X-FACEBOOK-PLATFORM"
#define MECH_WLM "X-MESSENGER-OAUTH2"
#define MECH_GOOGLE "X-OAUTH2"
#define MECH_PASSWORD "X-TELEPATHY-PASSWORD"

static void
generic_cb (TpChannel *proxy,
    const GError *error,
    gpointer user_data,
    GObject *weak_object)
{
  GSimpleAsyncResult *result = user_data;

  if (error != NULL)
    {
      g_simple_async_result_set_from_error (result, error);
      g_simple_async_result_complete (result);
    }
}

static void
sasl_status_changed_cb (TpChannel *channel,
    guint status,
    const gchar *dbus_error,
    GHashTable *details,
    gpointer user_data,
    GObject *self)
{
  GSimpleAsyncResult *result = user_data;

  switch (status)
    {
      case TP_SASL_STATUS_SERVER_SUCCEEDED:
        tp_cli_channel_interface_sasl_authentication_call_accept_sasl (channel,
            -1, generic_cb, g_object_ref (result), g_object_unref, NULL);
        break;

      case TP_SASL_STATUS_SERVER_FAILED:
      case TP_SASL_STATUS_CLIENT_FAILED:
        {
          GError *error = NULL;

          tp_proxy_dbus_error_to_gerror (channel, dbus_error,
              tp_asv_get_string (details, "debug-message"), &error);

          DEBUG ("SASL failed: %s", error->message);

          g_simple_async_result_take_error (result, error);
          g_simple_async_result_complete (result);
        }
        break;

      case TP_SASL_STATUS_SUCCEEDED:
        DEBUG ("SASL succeeded");

        g_simple_async_result_complete (result);
        break;

      default:
        break;
    }
}

static GSimpleAsyncResult *
empathy_sasl_auth_common_async (TpChannel *channel,
    GAsyncReadyCallback callback,
    gpointer user_data)
{
  GSimpleAsyncResult *result;
  GError *error = NULL;

  g_return_val_if_fail (TP_IS_CHANNEL (channel), NULL);
  g_return_val_if_fail (tp_proxy_has_interface_by_id (channel,
      TP_IFACE_QUARK_CHANNEL_INTERFACE_SASL_AUTHENTICATION), NULL);

  result = g_simple_async_result_new ((GObject *) channel,
      callback, user_data, empathy_sasl_auth_common_async);

  tp_cli_channel_interface_sasl_authentication_connect_to_sasl_status_changed (
      channel, sasl_status_changed_cb,
      g_object_ref (result), g_object_unref, NULL, &error);
  g_assert_no_error (error);

  return result;
}

typedef struct
{
  TpChannel *channel;
  gchar *client_id;
  gchar *access_token;
} FacebookData;

static void
facebook_data_free (FacebookData *data)
{
  g_object_unref (data->channel);
  g_free (data->client_id);
  g_free (data->access_token);
  g_slice_free (FacebookData, data);
}

static void
facebook_new_challenge_cb (TpChannel *channel,
    const GArray *challenge,
    gpointer user_data,
    GObject *weak_object)
{
  GSimpleAsyncResult *result = user_data;
  FacebookData *data;
  gchar *response;
  GArray *response_array;
139 140 141
  gchar **challenge_data;
  GString *response_string;
  gchar **d;
142 143 144 145 146 147

  DEBUG ("new challenge: %s", challenge->data);

  data = g_simple_async_result_get_op_res_gpointer (result);

  /* See https://developers.facebook.com/docs/chat/#platauth */
148 149 150 151 152 153 154 155 156 157
  response_string = g_string_new ("v=1.0&call_id=0");
  g_string_append_printf (response_string, "&access_token=%s&api_key=%s", data->access_token, data->client_id);

  challenge_data = g_strsplit (challenge->data, "&", 0);
  for (d = challenge_data; *d; d++) {
      if (strncmp (*d, "method=", 7) == 0 || strncmp (*d, "nonce=", 6) == 0) {
          g_string_append_c (response_string, '&');
          g_string_append (response_string, *d);
      }
  }
158

159
  DEBUG ("Response: %s", response_string->str);
160 161

  response_array = g_array_new (FALSE, FALSE, sizeof (gchar));
162
  g_array_append_vals (response_array, response_string->str, response_string->len);
163 164 165 166

  tp_cli_channel_interface_sasl_authentication_call_respond (data->channel, -1,
      response_array, generic_cb, g_object_ref (result), g_object_unref, NULL);

167 168
  g_string_free (response_string, TRUE);
  g_strfreev (challenge_data);
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345
  g_array_unref (response_array);
}

void
empathy_sasl_auth_facebook_async (TpChannel *channel,
    const gchar *client_id,
    const gchar *access_token,
    GAsyncReadyCallback callback,
    gpointer user_data)
{
  GSimpleAsyncResult *result;
  FacebookData *data;
  GError *error = NULL;

  result = empathy_sasl_auth_common_async (channel, callback, user_data);

  g_return_if_fail (result != NULL);
  g_return_if_fail (empathy_sasl_channel_supports_mechanism (channel,
      MECH_FACEBOOK));
  g_return_if_fail (!tp_str_empty (client_id));
  g_return_if_fail (!tp_str_empty (access_token));

  DEBUG ("Start %s mechanism", MECH_FACEBOOK);

  data = g_slice_new0 (FacebookData);
  data->channel = g_object_ref (channel);
  data->client_id = g_strdup (client_id);
  data->access_token = g_strdup (access_token);

  g_simple_async_result_set_op_res_gpointer (result, data,
      (GDestroyNotify) facebook_data_free);

  tp_cli_channel_interface_sasl_authentication_connect_to_new_challenge (
      channel, facebook_new_challenge_cb,
      g_object_ref (result), g_object_unref,
      NULL, &error);
  g_assert_no_error (error);

  tp_cli_channel_interface_sasl_authentication_call_start_mechanism (
      channel, -1, MECH_FACEBOOK, generic_cb,
      g_object_ref (result), g_object_unref, NULL);

  g_object_unref (result);
}

void
empathy_sasl_auth_wlm_async (TpChannel *channel,
    const gchar *access_token,
    GAsyncReadyCallback callback,
    gpointer user_data)
{
  GSimpleAsyncResult *result;
  guchar *token_decoded;
  gsize token_decoded_len;
  GArray *token_decoded_array;

  result = empathy_sasl_auth_common_async (channel, callback, user_data);

  g_return_if_fail (result != NULL);
  g_return_if_fail (empathy_sasl_channel_supports_mechanism (channel,
      MECH_WLM));
  g_return_if_fail (!tp_str_empty (access_token));

  DEBUG ("Start %s mechanism", MECH_WLM);

  /* Wocky will base64 encode, but token actually already is base64, so we
   * decode now and it will be re-encoded. */
  token_decoded = g_base64_decode (access_token, &token_decoded_len);
  token_decoded_array = g_array_new (FALSE, FALSE, sizeof (guchar));
  g_array_append_vals (token_decoded_array, token_decoded, token_decoded_len);

  tp_cli_channel_interface_sasl_authentication_call_start_mechanism_with_data (
      channel, -1, MECH_WLM, token_decoded_array,
      generic_cb, g_object_ref (result), g_object_unref, NULL);

  g_array_unref (token_decoded_array);
  g_free (token_decoded);
  g_object_unref (result);
}

void
empathy_sasl_auth_google_async (TpChannel *channel,
    const gchar *username,
    const gchar *access_token,
    GAsyncReadyCallback callback,
    gpointer user_data)
{
  GSimpleAsyncResult *result;
  GArray *credential;

  result = empathy_sasl_auth_common_async (channel, callback, user_data);

  g_return_if_fail (result != NULL);
  g_return_if_fail (empathy_sasl_channel_supports_mechanism (channel,
      MECH_GOOGLE));
  g_return_if_fail (!tp_str_empty (username));
  g_return_if_fail (!tp_str_empty (access_token));

  DEBUG ("Start %s mechanism", MECH_GOOGLE);

  credential = g_array_sized_new (FALSE, FALSE, sizeof (gchar),
      strlen (access_token) + strlen (username) + 2);

  g_array_append_val (credential, "\0");
  g_array_append_vals (credential, username, strlen (username));
  g_array_append_val (credential, "\0");
  g_array_append_vals (credential, access_token, strlen (access_token));

  tp_cli_channel_interface_sasl_authentication_call_start_mechanism_with_data (
      channel, -1, MECH_GOOGLE, credential,
      generic_cb, g_object_ref (result), g_object_unref, NULL);

  g_array_unref (credential);
  g_object_unref (result);
}

void
empathy_sasl_auth_password_async (TpChannel *channel,
    const gchar *password,
    GAsyncReadyCallback callback,
    gpointer user_data)
{
  GSimpleAsyncResult *result;
  GArray *password_array;

  result = empathy_sasl_auth_common_async (channel, callback, user_data);

  g_return_if_fail (result != NULL);
  g_return_if_fail (empathy_sasl_channel_supports_mechanism (channel,
      MECH_PASSWORD));
  g_return_if_fail (!tp_str_empty (password));

  DEBUG ("Start %s mechanism", MECH_PASSWORD);

  password_array = g_array_sized_new (FALSE, FALSE, sizeof (gchar),
      strlen (password));
  g_array_append_vals (password_array, password, strlen (password));

  tp_cli_channel_interface_sasl_authentication_call_start_mechanism_with_data (
      channel, -1, MECH_PASSWORD, password_array,
      generic_cb, g_object_ref (result), g_object_unref, NULL);

  g_array_unref (password_array);
  g_object_unref (result);
}

gboolean
empathy_sasl_auth_finish (TpChannel *channel,
    GAsyncResult *result,
    GError **error)
{
  empathy_implement_finish_void (channel, empathy_sasl_auth_common_async);
}

gboolean
empathy_sasl_channel_supports_mechanism (TpChannel *channel,
    const gchar *mechanism)
{
  GVariant *props;
  GStrv available_mechanisms;
  gboolean result;

  props = tp_channel_dup_immutable_properties (channel);

  g_variant_lookup (props,
      TP_PROP_CHANNEL_INTERFACE_SASL_AUTHENTICATION_AVAILABLE_MECHANISMS,
      "^as", &available_mechanisms);

  result = tp_strv_contains ((const gchar * const *) available_mechanisms,
      mechanism);

  g_variant_unref (props);
  g_strfreev (available_mechanisms);
  return result;
}

EmpathySaslMechanism
346 347
empathy_sasl_channel_select_mechanism (TpChannel *channel,
    const gchar *credential_type)
348 349 350
{
  guint i;

351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
  if (g_strcmp0 (credential_type, "password") == 0) {
    if (empathy_sasl_channel_supports_mechanism (channel,
          MECH_PASSWORD))
      return EMPATHY_SASL_MECHANISM_PASSWORD;
  } else if (g_strcmp0 (credential_type, "oauth2") == 0) {
    if (empathy_sasl_channel_supports_mechanism (channel,
          MECH_FACEBOOK))
      return EMPATHY_SASL_MECHANISM_FACEBOOK;
    else if (empathy_sasl_channel_supports_mechanism (channel,
          MECH_WLM))
      return EMPATHY_SASL_MECHANISM_WLM;
    else if (empathy_sasl_channel_supports_mechanism (channel,
          MECH_GOOGLE))
      return EMPATHY_SASL_MECHANISM_GOOGLE;
  }
366 367 368

  return EMPATHY_SASL_MECHANISM_UNSUPPORTED;
}