libempathy/empathy-tls-certificate.c

   1 /*
   2  * empathy-tls-certificate.c - Source for EmpathyTLSCertificate
   3  * Copyright (C) 2010 Collabora Ltd.
   4  * @author Cosimo Cecchi <cosimo.cecchi@collabora.co.uk>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include <config.h>
  22
  23 #include "empathy-tls-certificate.h"
  24
  25 #include <errno.h>
  26
  27 #include <glib/gstdio.h>
  28
  29 #include <gnutls/gnutls.h>
  30 #include <gnutls/x509.h>
  31
  32 #include <telepathy-glib/util.h>
  33
  34 #define DEBUG_FLAG EMPATHY_DEBUG_TLS
  35 #include "empathy-debug.h"
  36 #include "empathy-utils.h"
  37
  38 #include "extensions/extensions.h"
  39
  40 enum {
  41   /* proxy properties */
  42   PROP_CERT_TYPE = 1,
  43   PROP_CERT_DATA,
  44   PROP_STATE,
  45   LAST_PROPERTY,
  46 };
  47
  48 typedef struct {
  49   GSimpleAsyncResult *async_prepare_res;
  50
  51   /* TLSCertificate properties */
  52   gchar *cert_type;
  53   GPtrArray *cert_data;
  54   EmpTLSCertificateState state;
  55
  56   gboolean is_prepared;
  57 } EmpathyTLSCertificatePriv;
  58
  59 G_DEFINE_TYPE (EmpathyTLSCertificate, empathy_tls_certificate,
  60     TP_TYPE_PROXY);
  61
  62 #define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyTLSCertificate);
  63
  64 static GType
  65 array_of_ay_get_type (void)
  66 {
  67   static GType t = 0;
  68
  69   if (G_UNLIKELY (t == 0))
  70     {
  71       t = dbus_g_type_get_collection ("GPtrArray",
  72           dbus_g_type_get_collection ("GArray",
  73               G_TYPE_UCHAR));
  74     }
  75
  76   return t;
  77 }
  78
  79 static void
  80 tls_certificate_got_all_cb (TpProxy *proxy,
  81     GHashTable *properties,
  82     const GError *error,
  83     gpointer user_data,
  84     GObject *weak_object)
  85 {
  86   GPtrArray *cert_data;
  87   EmpathyTLSCertificate *self = EMPATHY_TLS_CERTIFICATE (weak_object);
  88   EmpathyTLSCertificatePriv *priv = GET_PRIV (self);
  89
  90   if (error != NULL)
  91     {
  92       g_simple_async_result_set_from_error (priv->async_prepare_res, error);
  93       g_simple_async_result_complete (priv->async_prepare_res);
  94       tp_clear_object (&priv->async_prepare_res);
  95
  96       return;
  97     }
  98
  99   priv->cert_type = g_strdup (tp_asv_get_string (properties,
 100           "CertificateType"));
 101   priv->state = tp_asv_get_uint32 (properties, "State", NULL);
 102
 103   cert_data = tp_asv_get_boxed (properties, "CertificateChainData",
 104       array_of_ay_get_type ());
 105   g_assert (cert_data != NULL);
 106   priv->cert_data = g_boxed_copy (array_of_ay_get_type (), cert_data);
 107
 108   DEBUG ("Got a certificate chain long %u, of type %s",
 109       priv->cert_data->len, priv->cert_type);
 110
 111   priv->is_prepared = TRUE;
 112
 113   g_simple_async_result_complete (priv->async_prepare_res);
 114   tp_clear_object (&priv->async_prepare_res);
 115 }
 116
 117 void
 118 empathy_tls_certificate_prepare_async (EmpathyTLSCertificate *self,
 119     GAsyncReadyCallback callback,
 120     gpointer user_data)
 121 {
 122   EmpathyTLSCertificatePriv *priv = GET_PRIV (self);
 123
 124   /* emit an error if we're already preparing the object */
 125   if (priv->async_prepare_res != NULL)
 126     {
 127       g_simple_async_report_error_in_idle (G_OBJECT (self),
 128           callback, user_data,
 129           G_IO_ERROR, G_IO_ERROR_PENDING,
 130           "%s",
 131           "Prepare operation already in progress on the TLS certificate.");
 132
 133       return;
 134     }
 135
 136   /* if the object is already prepared, just complete in idle */
 137   if (priv->is_prepared)
 138     {
 139       tp_simple_async_report_success_in_idle (G_OBJECT (self),
 140           callback, user_data, empathy_tls_certificate_prepare_async);
 141
 142       return;
 143     }
 144
 145   priv->async_prepare_res = g_simple_async_result_new (G_OBJECT (self),
 146       callback, user_data, empathy_tls_certificate_prepare_async);
 147
 148   /* call GetAll() on the certificate */
 149   tp_cli_dbus_properties_call_get_all (self,
 150       -1, EMP_IFACE_AUTHENTICATION_TLS_CERTIFICATE,
 151       tls_certificate_got_all_cb, NULL, NULL,
 152       G_OBJECT (self));
 153 }
 154
 155 gboolean
 156 empathy_tls_certificate_prepare_finish (EmpathyTLSCertificate *self,
 157     GAsyncResult *result,
 158     GError **error)
 159 {
 160   gboolean retval = TRUE;
 161
 162   if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (result),
 163           error))
 164     retval = FALSE;
 165
 166   return retval;
 167 }
 168
 169 static void
 170 empathy_tls_certificate_finalize (GObject *object)
 171 {
 172   EmpathyTLSCertificatePriv *priv = GET_PRIV (object);
 173
 174   DEBUG ("%p", object);
 175
 176   g_free (priv->cert_type);
 177   tp_clear_boxed (array_of_ay_get_type (), &priv->cert_data);
 178
 179   G_OBJECT_CLASS (empathy_tls_certificate_parent_class)->finalize (object);
 180 }
 181
 182 static void
 183 empathy_tls_certificate_get_property (GObject *object,
 184     guint property_id,
 185     GValue *value,
 186     GParamSpec *pspec)
 187 {
 188   EmpathyTLSCertificatePriv *priv = GET_PRIV (object);
 189
 190   switch (property_id)
 191     {
 192     case PROP_CERT_TYPE:
 193       g_value_set_string (value, priv->cert_type);
 194       break;
 195     case PROP_CERT_DATA:
 196       g_value_set_boxed (value, priv->cert_data);
 197       break;
 198     case PROP_STATE:
 199       g_value_set_uint (value, priv->state);
 200       break;
 201     default:
 202       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 203       break;
 204     }
 205 }
 206
 207 static void
 208 empathy_tls_certificate_init (EmpathyTLSCertificate *self)
 209 {
 210   self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
 211       EMPATHY_TYPE_TLS_CERTIFICATE, EmpathyTLSCertificatePriv);
 212 }
 213
 214 static void
 215 empathy_tls_certificate_class_init (EmpathyTLSCertificateClass *klass)
 216 {
 217   GParamSpec *pspec;
 218   GObjectClass *oclass = G_OBJECT_CLASS (klass);
 219   TpProxyClass *pclass = TP_PROXY_CLASS (klass);
 220
 221   oclass->get_property = empathy_tls_certificate_get_property;
 222   oclass->finalize = empathy_tls_certificate_finalize;
 223
 224   pclass->interface = EMP_IFACE_QUARK_AUTHENTICATION_TLS_CERTIFICATE;
 225   pclass->must_have_unique_name = TRUE;
 226
 227   g_type_class_add_private (klass, sizeof (EmpathyTLSCertificatePriv));
 228
 229   pspec = g_param_spec_string ("cert-type", "Certificate type",
 230       "The type of this certificate.",
 231       NULL,
 232       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
 233   g_object_class_install_property (oclass, PROP_CERT_TYPE, pspec);
 234
 235   pspec = g_param_spec_boxed ("cert-data", "Certificate chain data",
 236       "The raw DER-encoded certificate chain data.",
 237       array_of_ay_get_type (),
 238       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
 239   g_object_class_install_property (oclass, PROP_CERT_DATA, pspec);
 240
 241   pspec = g_param_spec_uint ("state", "State",
 242       "The state of this certificate.",
 243       EMP_TLS_CERTIFICATE_STATE_PENDING, NUM_EMP_TLS_CERTIFICATE_STATES -1,
 244       EMP_TLS_CERTIFICATE_STATE_PENDING,
 245       G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
 246   g_object_class_install_property (oclass, PROP_STATE, pspec);
 247 }
 248
 249 static void
 250 cert_proxy_accept_cb (TpProxy *proxy,
 251     const GError *error,
 252     gpointer user_data,
 253     GObject *weak_object)
 254 {
 255   GSimpleAsyncResult *accept_result = user_data;
 256
 257   DEBUG ("Callback for accept(), error %p", error);
 258
 259   if (error != NULL)
 260     {
 261       DEBUG ("Error was %s", error->message);
 262       g_simple_async_result_set_from_error (accept_result, error);
 263     }
 264
 265   g_simple_async_result_complete (accept_result);
 266 }
 267
 268 static void
 269 cert_proxy_reject_cb (TpProxy *proxy,
 270     const GError *error,
 271     gpointer user_data,
 272     GObject *weak_object)
 273 {
 274   GSimpleAsyncResult *reject_result = user_data;
 275
 276   DEBUG ("Callback for reject(), error %p", error);
 277
 278   if (error != NULL)
 279     {
 280       DEBUG ("Error was %s", error->message);
 281       g_simple_async_result_set_from_error (reject_result, error);
 282     }
 283
 284   g_simple_async_result_complete (reject_result);
 285 }
 286
 287 static const gchar *
 288 reject_reason_get_dbus_error (EmpTLSCertificateRejectReason reason)
 289 {
 290   const gchar *retval = NULL;
 291
 292   switch (reason)
 293     {
 294     case EMP_TLS_CERTIFICATE_REJECT_REASON_UNTRUSTED:
 295       retval = tp_error_get_dbus_name (TP_ERROR_CERT_UNTRUSTED);
 296       break;
 297     case EMP_TLS_CERTIFICATE_REJECT_REASON_EXPIRED:
 298       retval = tp_error_get_dbus_name (TP_ERROR_CERT_EXPIRED);
 299       break;
 300     case EMP_TLS_CERTIFICATE_REJECT_REASON_NOT_ACTIVATED:
 301       retval = tp_error_get_dbus_name (TP_ERROR_CERT_NOT_ACTIVATED);
 302       break;
 303     case EMP_TLS_CERTIFICATE_REJECT_REASON_FINGERPRINT_MISMATCH:
 304       retval = tp_error_get_dbus_name (TP_ERROR_CERT_FINGERPRINT_MISMATCH);
 305       break;
 306     case EMP_TLS_CERTIFICATE_REJECT_REASON_HOSTNAME_MISMATCH:
 307       retval = tp_error_get_dbus_name (TP_ERROR_CERT_HOSTNAME_MISMATCH);
 308       break;
 309     case EMP_TLS_CERTIFICATE_REJECT_REASON_SELF_SIGNED:
 310       retval = tp_error_get_dbus_name (TP_ERROR_CERT_SELF_SIGNED);
 311       break;
 312     case EMP_TLS_CERTIFICATE_REJECT_REASON_REVOKED:
 313       retval = tp_error_get_dbus_name (TP_ERROR_CERT_REVOKED);
 314       break;
 315     case EMP_TLS_CERTIFICATE_REJECT_REASON_INSECURE:
 316       retval = tp_error_get_dbus_name (TP_ERROR_CERT_INSECURE);
 317       break;
 318     case EMP_TLS_CERTIFICATE_REJECT_REASON_LIMIT_EXCEEDED:
 319       retval = tp_error_get_dbus_name (TP_ERROR_CERT_LIMIT_EXCEEDED);
 320       break;
 321     case EMP_TLS_CERTIFICATE_REJECT_REASON_UNKNOWN:
 322     default:
 323       retval = tp_error_get_dbus_name (TP_ERROR_CERT_INVALID);
 324       break;
 325     }
 326
 327   return retval;
 328 }
 329
 330 EmpathyTLSCertificate *
 331 empathy_tls_certificate_new (TpDBusDaemon *dbus,
 332     const gchar *bus_name,
 333     const gchar *object_path,
 334     GError **error)
 335 {
 336   EmpathyTLSCertificate *retval = NULL;
 337
 338   if (!tp_dbus_check_valid_bus_name (bus_name,
 339           TP_DBUS_NAME_TYPE_UNIQUE, error))
 340     goto finally;
 341
 342   if (!tp_dbus_check_valid_object_path (object_path, error))
 343     goto finally;
 344
 345   retval = g_object_new (EMPATHY_TYPE_TLS_CERTIFICATE,
 346       "dbus-daemon", dbus,
 347       "bus-name", bus_name,
 348       "object-path", object_path,
 349       NULL);
 350
 351 finally:
 352   if (*error != NULL)
 353     DEBUG ("Error while creating the TLS certificate: %s",
 354         (*error)->message);
 355
 356   return retval;
 357 }
 358
 359 void
 360 empathy_tls_certificate_accept_async (EmpathyTLSCertificate *self,
 361     GAsyncReadyCallback callback,
 362     gpointer user_data)
 363 {
 364   GSimpleAsyncResult *accept_result;
 365
 366   g_assert (EMPATHY_IS_TLS_CERTIFICATE (self));
 367
 368   DEBUG ("Accepting TLS certificate");
 369
 370   accept_result = g_simple_async_result_new (G_OBJECT (self),
 371       callback, user_data, empathy_tls_certificate_accept_async);
 372
 373   emp_cli_authentication_tls_certificate_call_accept (TP_PROXY (self),
 374       -1, cert_proxy_accept_cb,
 375       accept_result, g_object_unref,
 376       G_OBJECT (self));
 377 }
 378
 379 gboolean
 380 empathy_tls_certificate_accept_finish (EmpathyTLSCertificate *self,
 381     GAsyncResult *result,
 382     GError **error)
 383 {
 384   if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (result),
 385           error))
 386     return FALSE;
 387
 388   return TRUE;
 389 }
 390
 391 void
 392 empathy_tls_certificate_reject_async (EmpathyTLSCertificate *self,
 393     EmpTLSCertificateRejectReason reason,
 394     GHashTable *details,
 395     GAsyncReadyCallback callback,
 396     gpointer user_data)
 397 {
 398   const gchar *dbus_error;
 399   GSimpleAsyncResult *reject_result;
 400
 401   g_assert (EMPATHY_IS_TLS_CERTIFICATE (self));
 402
 403   DEBUG ("Rejecting TLS certificate with reason %u", reason);
 404
 405   dbus_error = reject_reason_get_dbus_error (reason);
 406   reject_result = g_simple_async_result_new (G_OBJECT (self),
 407       callback, user_data, empathy_tls_certificate_reject_async);
 408
 409   emp_cli_authentication_tls_certificate_call_reject (TP_PROXY (self),
 410       -1, reason, dbus_error, details, cert_proxy_reject_cb,
 411       reject_result, g_object_unref, G_OBJECT (self));
 412 }
 413
 414 gboolean
 415 empathy_tls_certificate_reject_finish (EmpathyTLSCertificate *self,
 416     GAsyncResult *result,
 417     GError **error)
 418 {
 419   if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (result),
 420           error))
 421     return FALSE;
 422
 423   return TRUE;
 424 }
 425
 426 static gsize
 427 get_exported_size (gnutls_x509_crt_t cert)
 428 {
 429   gsize retval;
 430   guchar fake;
 431
 432   /* fake an export so we get the size to allocate */
 433   gnutls_x509_crt_export (cert, GNUTLS_X509_FMT_PEM,
 434       &fake, &retval);
 435
 436   DEBUG ("Should allocate %lu bytes", (gulong) retval);
 437
 438   return retval;
 439 }
 440
 441 void
 442 empathy_tls_certificate_store_ca (EmpathyTLSCertificate *self)
 443 {
 444   GArray *last_cert;
 445   gnutls_x509_crt_t cert;
 446   gnutls_datum_t datum = { NULL, 0 };
 447   gsize exported_len;
 448   guchar *exported_cert = NULL;
 449   gint res;
 450   gchar *user_certs_dir = NULL, *filename = NULL, *path = NULL;
 451   GError *error = NULL;
 452   EmpathyTLSCertificatePriv *priv = GET_PRIV (self);
 453
 454   last_cert = g_ptr_array_index (priv->cert_data, priv->cert_data->len - 1);
 455   datum.data = (guchar *) last_cert->data;
 456   datum.size = last_cert->len;
 457
 458   gnutls_x509_crt_init (&cert);
 459   gnutls_x509_crt_import (cert, &datum, GNUTLS_X509_FMT_DER);
 460
 461   /* make sure it's self-signed, otherwise it's not a CA */
 462   if (gnutls_x509_crt_check_issuer (cert, cert) <= 0)
 463     {
 464       DEBUG ("Can't import the CA, as it's not self-signed");
 465       gnutls_x509_crt_deinit (cert);
 466
 467       return;
 468     }
 469
 470   if (gnutls_x509_crt_get_ca_status (cert, NULL) <= 0)
 471     {
 472       DEBUG ("Can't import the CA, it's not a valid CA certificate");
 473       gnutls_x509_crt_deinit (cert);
 474
 475       goto out;
 476     }
 477
 478   exported_len = get_exported_size (cert);
 479   exported_cert = g_malloc (sizeof (guchar) * exported_len);
 480
 481   res = gnutls_x509_crt_export (cert, GNUTLS_X509_FMT_PEM,
 482       exported_cert, &exported_len);
 483
 484   if (res < 0)
 485     {
 486       DEBUG ("Failed to export the CA certificate; GnuTLS returned %d", res);
 487       gnutls_x509_crt_deinit (cert);
 488
 489       goto out;
 490     }
 491
 492   gnutls_x509_crt_deinit (cert);
 493
 494   /* write the file */
 495   user_certs_dir = g_build_filename (g_get_user_config_dir (),
 496       "telepathy", "certs", NULL);
 497
 498   res = g_mkdir_with_parents (user_certs_dir, S_IRWXU | S_IRWXG);
 499
 500   if (res < 0)
 501     {
 502       DEBUG ("Failed to create the user certificate directory: %s",
 503           g_strerror (errno));
 504
 505       goto out;
 506     }
 507
 508   do
 509     {
 510       g_free (path);
 511
 512       filename = g_strdup_printf ("cert-%p", cert);
 513       path = g_build_filename (user_certs_dir, filename, NULL);
 514
 515       g_free (filename);
 516     }
 517   while (g_file_test (path, G_FILE_TEST_EXISTS));
 518
 519   DEBUG ("Will save to %s", path);
 520
 521   g_file_set_contents (path, (const gchar *) exported_cert, exported_len,
 522       &error);
 523
 524   if (error != NULL)
 525     {
 526       DEBUG ("Can't save the CA certificate to %s: %s",
 527           path, error->message);
 528
 529       g_error_free (error);
 530     }
 531
 532  out:
 533   g_free (path);
 534   g_free (exported_cert);
 535   g_free (user_certs_dir);
 536 }