gio/gdbusauth.c

   1 /* GDBus - GLib D-Bus Library
   2  *
   3  * Copyright (C) 2008-2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: David Zeuthen <davidz@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include "gdbusauth.h"
  26
  27 #include "gdbusauthmechanismanon.h"
  28 #include "gdbusauthmechanismexternal.h"
  29 #include "gdbusauthmechanismsha1.h"
  30 #include "gdbusauthobserver.h"
  31
  32 #include "gdbuserror.h"
  33 #include "gdbusutils.h"
  34 #include "gioenumtypes.h"
  35 #include "gcredentials.h"
  36 #include "gdbusprivate.h"
  37 #include "giostream.h"
  38 #include "gdatainputstream.h"
  39 #include "gdataoutputstream.h"
  40
  41 #ifdef G_OS_UNIX
  42 #include <sys/types.h>
  43 #include <sys/socket.h>
  44 #include "gunixconnection.h"
  45 #include "gunixcredentialsmessage.h"
  46 #endif
  47
  48 #include "glibintl.h"
  49 #include "gioalias.h"
  50
  51 static void
  52 debug_print (const gchar *message, ...)
  53 {
  54   if (G_UNLIKELY (_g_dbus_debug_authentication ()))
  55     {
  56       gchar *s;
  57       GString *str;
  58       va_list var_args;
  59       guint n;
  60
  61       va_start (var_args, message);
  62       s = g_strdup_vprintf (message, var_args);
  63       va_end (var_args);
  64
  65       str = g_string_new (NULL);
  66       for (n = 0; s[n] != '\0'; n++)
  67         {
  68           if (G_UNLIKELY (s[n] == '\r'))
  69             g_string_append (str, "\\r");
  70           else if (G_UNLIKELY (s[n] == '\n'))
  71             g_string_append (str, "\\n");
  72           else
  73             g_string_append_c (str, s[n]);
  74         }
  75       g_print ("GDBus-debug:Auth: %s\n", str->str);
  76       g_string_free (str, TRUE);
  77       g_free (s);
  78     }
  79 }
  80
  81 typedef struct
  82 {
  83   const gchar *name;
  84   gint priority;
  85   GType gtype;
  86 } Mechanism;
  87
  88 static void mechanism_free (Mechanism *m);
  89
  90 struct _GDBusAuthPrivate
  91 {
  92   GIOStream *stream;
  93
  94   /* A list of available Mechanism, sorted according to priority  */
  95   GList *available_mechanisms;
  96 };
  97
  98 enum
  99 {
 100   PROP_0,
 101   PROP_STREAM
 102 };
 103
 104 G_DEFINE_TYPE (GDBusAuth, _g_dbus_auth, G_TYPE_OBJECT);
 105
 106 /* ---------------------------------------------------------------------------------------------------- */
 107
 108 static void
 109 _g_dbus_auth_finalize (GObject *object)
 110 {
 111   GDBusAuth *auth = G_DBUS_AUTH (object);
 112
 113   if (auth->priv->stream != NULL)
 114     g_object_unref (auth->priv->stream);
 115   g_list_foreach (auth->priv->available_mechanisms, (GFunc) mechanism_free, NULL);
 116   g_list_free (auth->priv->available_mechanisms);
 117
 118   if (G_OBJECT_CLASS (_g_dbus_auth_parent_class)->finalize != NULL)
 119     G_OBJECT_CLASS (_g_dbus_auth_parent_class)->finalize (object);
 120 }
 121
 122 static void
 123 _g_dbus_auth_get_property (GObject    *object,
 124                            guint       prop_id,
 125                            GValue     *value,
 126                            GParamSpec *pspec)
 127 {
 128   GDBusAuth *auth = G_DBUS_AUTH (object);
 129
 130   switch (prop_id)
 131     {
 132     case PROP_STREAM:
 133       g_value_set_object (value, auth->priv->stream);
 134       break;
 135
 136     default:
 137       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 138       break;
 139     }
 140 }
 141
 142 static void
 143 _g_dbus_auth_set_property (GObject      *object,
 144                            guint         prop_id,
 145                            const GValue *value,
 146                            GParamSpec   *pspec)
 147 {
 148   GDBusAuth *auth = G_DBUS_AUTH (object);
 149
 150   switch (prop_id)
 151     {
 152     case PROP_STREAM:
 153       auth->priv->stream = g_value_dup_object (value);
 154       break;
 155
 156     default:
 157       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 158       break;
 159     }
 160 }
 161
 162 static void
 163 _g_dbus_auth_class_init (GDBusAuthClass *klass)
 164 {
 165   GObjectClass *gobject_class;
 166
 167   g_type_class_add_private (klass, sizeof (GDBusAuthPrivate));
 168
 169   gobject_class = G_OBJECT_CLASS (klass);
 170   gobject_class->get_property = _g_dbus_auth_get_property;
 171   gobject_class->set_property = _g_dbus_auth_set_property;
 172   gobject_class->finalize     = _g_dbus_auth_finalize;
 173
 174   g_object_class_install_property (gobject_class,
 175                                    PROP_STREAM,
 176                                    g_param_spec_object ("stream",
 177                                                         P_("IO Stream"),
 178                                                         P_("The underlying GIOStream used for I/O"),
 179                                                         G_TYPE_IO_STREAM,
 180                                                         G_PARAM_READABLE |
 181                                                         G_PARAM_WRITABLE |
 182                                                         G_PARAM_CONSTRUCT_ONLY |
 183                                                         G_PARAM_STATIC_NAME |
 184                                                         G_PARAM_STATIC_BLURB |
 185                                                         G_PARAM_STATIC_NICK));
 186 }
 187
 188 static void
 189 mechanism_free (Mechanism *m)
 190 {
 191   g_free (m);
 192 }
 193
 194 static void
 195 add_mechanism (GDBusAuth *auth,
 196                GType      mechanism_type)
 197 {
 198   Mechanism *m;
 199
 200   m = g_new0 (Mechanism, 1);
 201   m->name = _g_dbus_auth_mechanism_get_name (mechanism_type);
 202   m->priority = _g_dbus_auth_mechanism_get_priority (mechanism_type);
 203   m->gtype = mechanism_type;
 204
 205   auth->priv->available_mechanisms = g_list_prepend (auth->priv->available_mechanisms, m);
 206 }
 207
 208 static gint
 209 mech_compare_func (Mechanism *a, Mechanism *b)
 210 {
 211   gint ret;
 212   /* ensure deterministic order */
 213   ret = b->priority - a->priority;
 214   if (ret == 0)
 215     ret = g_strcmp0 (b->name, a->name);
 216   return ret;
 217 }
 218
 219 static void
 220 _g_dbus_auth_init (GDBusAuth *auth)
 221 {
 222   auth->priv = G_TYPE_INSTANCE_GET_PRIVATE (auth, G_TYPE_DBUS_AUTH, GDBusAuthPrivate);
 223
 224   /* TODO: trawl extension points */
 225   add_mechanism (auth, G_TYPE_DBUS_AUTH_MECHANISM_ANON);
 226   add_mechanism (auth, G_TYPE_DBUS_AUTH_MECHANISM_SHA1);
 227   add_mechanism (auth, G_TYPE_DBUS_AUTH_MECHANISM_EXTERNAL);
 228
 229   auth->priv->available_mechanisms = g_list_sort (auth->priv->available_mechanisms,
 230                                                   (GCompareFunc) mech_compare_func);
 231 }
 232
 233 static GType
 234 find_mech_by_name (GDBusAuth *auth,
 235                    const gchar *name)
 236 {
 237   GType ret;
 238   GList *l;
 239
 240   ret = (GType) 0;
 241
 242   for (l = auth->priv->available_mechanisms; l != NULL; l = l->next)
 243     {
 244       Mechanism *m = l->data;
 245       if (g_strcmp0 (name, m->name) == 0)
 246         {
 247           ret = m->gtype;
 248           goto out;
 249         }
 250     }
 251
 252  out:
 253   return ret;
 254 }
 255
 256 GDBusAuth  *
 257 _g_dbus_auth_new (GIOStream *stream)
 258 {
 259   return g_object_new (G_TYPE_DBUS_AUTH,
 260                        "stream", stream,
 261                        NULL);
 262 }
 263
 264 /* ---------------------------------------------------------------------------------------------------- */
 265 /* like g_data_input_stream_read_line() but sets error if there's no content to read */
 266 static gchar *
 267 _my_g_data_input_stream_read_line (GDataInputStream  *dis,
 268                                    gsize             *out_line_length,
 269                                    GCancellable      *cancellable,
 270                                    GError           **error)
 271 {
 272   gchar *ret;
 273
 274   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 275
 276   ret = g_data_input_stream_read_line (dis,
 277                                        out_line_length,
 278                                        cancellable,
 279                                        error);
 280   if (ret == NULL && error != NULL && *error == NULL)
 281     {
 282       g_set_error_literal (error,
 283                            G_IO_ERROR,
 284                            G_IO_ERROR_FAILED,
 285                            _("Unexpected lack of content trying to read a line"));
 286     }
 287
 288   return ret;
 289 }
 290
 291 /* This function is to avoid situations like this
 292  *
 293  * BEGIN\r\nl\0\0\1...
 294  *
 295  * e.g. where we read into the first D-Bus message while waiting for
 296  * the final line from the client (TODO: file bug against gio for
 297  * this)
 298  */
 299 static gchar *
 300 _my_g_input_stream_read_line_safe (GInputStream  *i,
 301                                    gsize         *out_line_length,
 302                                    GCancellable  *cancellable,
 303                                    GError       **error)
 304 {
 305   GString *str;
 306   gchar c;
 307   gssize num_read;
 308   gboolean last_was_cr;
 309
 310   str = g_string_new (NULL);
 311
 312   last_was_cr = FALSE;
 313   while (TRUE)
 314     {
 315       num_read = g_input_stream_read (i,
 316                                       &c,
 317                                       1,
 318                                       cancellable,
 319                                       error);
 320       if (num_read == -1)
 321         goto fail;
 322       if (num_read == 0)
 323         {
 324           if (error != NULL && *error == NULL)
 325             {
 326               g_set_error_literal (error,
 327                                    G_IO_ERROR,
 328                                    G_IO_ERROR_FAILED,
 329                                    _("Unexpected lack of content trying to (safely) read a line"));
 330             }
 331           goto fail;
 332         }
 333
 334       g_string_append_c (str, (gint) c);
 335       if (last_was_cr)
 336         {
 337           if (c == 0x0a)
 338             {
 339               g_assert (str->len >= 2);
 340               g_string_set_size (str, str->len - 2);
 341               goto out;
 342             }
 343         }
 344       last_was_cr = (c == 0x0d);
 345     }
 346
 347  out:
 348   if (out_line_length != NULL)
 349     *out_line_length = str->len;
 350   return g_string_free (str, FALSE);
 351
 352  fail:
 353   g_assert (error == NULL || *error != NULL);
 354   g_string_free (str, TRUE);
 355   return NULL;
 356 }
 357
 358 /* ---------------------------------------------------------------------------------------------------- */
 359
 360 static void
 361 append_nibble (GString *s, gint val)
 362 {
 363   g_string_append_c (s, val >= 10 ? ('a' + val - 10) : ('0' + val));
 364 }
 365
 366 static gchar *
 367 hexdecode (const gchar  *str,
 368            gsize        *out_len,
 369            GError      **error)
 370 {
 371   gchar *ret;
 372   GString *s;
 373   guint n;
 374
 375   ret = NULL;
 376   s = g_string_new (NULL);
 377
 378   for (n = 0; str[n] != '\0'; n += 2)
 379     {
 380       gint upper_nibble;
 381       gint lower_nibble;
 382       guint value;
 383
 384       upper_nibble = g_ascii_xdigit_value (str[n]);
 385       lower_nibble = g_ascii_xdigit_value (str[n + 1]);
 386       if (upper_nibble == -1 || lower_nibble == -1)
 387         {
 388           g_set_error (error,
 389                        G_IO_ERROR,
 390                        G_IO_ERROR_FAILED,
 391                        "Error hexdecoding string `%s' around position %d",
 392                        str, n);
 393           goto out;
 394         }
 395       value = (upper_nibble<<4) | lower_nibble;
 396       g_string_append_c (s, value);
 397     }
 398
 399   ret = g_string_free (s, FALSE);
 400   s = NULL;
 401
 402  out:
 403   if (s != NULL)
 404     g_string_free (s, TRUE);
 405   return ret;
 406 }
 407
 408 /* TODO: take len */
 409 static gchar *
 410 hexencode (const gchar *str)
 411 {
 412   guint n;
 413   GString *s;
 414
 415   s = g_string_new (NULL);
 416   for (n = 0; str[n] != '\0'; n++)
 417     {
 418       gint val;
 419       gint upper_nibble;
 420       gint lower_nibble;
 421
 422       val = ((const guchar *) str)[n];
 423       upper_nibble = val >> 4;
 424       lower_nibble = val & 0x0f;
 425
 426       append_nibble (s, upper_nibble);
 427       append_nibble (s, lower_nibble);
 428     }
 429
 430   return g_string_free (s, FALSE);
 431 }
 432
 433 /* ---------------------------------------------------------------------------------------------------- */
 434
 435 static GDBusAuthMechanism *
 436 client_choose_mech_and_send_initial_response (GDBusAuth           *auth,
 437                                               GCredentials        *credentials_that_were_sent,
 438                                               const gchar* const  *supported_auth_mechs,
 439                                               GPtrArray           *attempted_auth_mechs,
 440                                               GDataOutputStream   *dos,
 441                                               GCancellable        *cancellable,
 442                                               GError             **error)
 443 {
 444   GDBusAuthMechanism *mech;
 445   GType auth_mech_to_use_gtype;
 446   guint n;
 447   guint m;
 448   gchar *initial_response;
 449   gsize initial_response_len;
 450   gchar *encoded;
 451   gchar *s;
 452
 453  again:
 454   mech = NULL;
 455
 456   debug_print ("CLIENT: Trying to choose mechanism");
 457
 458   /* find an authentication mechanism to try, if any */
 459   auth_mech_to_use_gtype = (GType) 0;
 460   for (n = 0; supported_auth_mechs[n] != NULL; n++)
 461     {
 462       gboolean attempted_already;
 463       attempted_already = FALSE;
 464       for (m = 0; m < attempted_auth_mechs->len; m++)
 465         {
 466           if (g_strcmp0 (supported_auth_mechs[n], attempted_auth_mechs->pdata[m]) == 0)
 467             {
 468               attempted_already = TRUE;
 469               break;
 470             }
 471         }
 472       if (!attempted_already)
 473         {
 474           auth_mech_to_use_gtype = find_mech_by_name (auth, supported_auth_mechs[n]);
 475           if (auth_mech_to_use_gtype != (GType) 0)
 476             break;
 477         }
 478     }
 479
 480   if (auth_mech_to_use_gtype == (GType) 0)
 481     {
 482       guint n;
 483       gchar *available;
 484       GString *tried_str;
 485
 486       debug_print ("CLIENT: Exhausted all available mechanisms");
 487
 488       available = g_strjoinv (", ", (gchar **) supported_auth_mechs);
 489
 490       tried_str = g_string_new (NULL);
 491       for (n = 0; n < attempted_auth_mechs->len; n++)
 492         {
 493           if (n > 0)
 494             g_string_append (tried_str, ", ");
 495           g_string_append (tried_str, attempted_auth_mechs->pdata[n]);
 496         }
 497       g_set_error (error,
 498                    G_IO_ERROR,
 499                    G_IO_ERROR_FAILED,
 500                    _("Exhausted all available authentication mechanisms (tried: %s) (available: %s)"),
 501                    tried_str->str,
 502                    available);
 503       g_string_free (tried_str, TRUE);
 504       g_free (available);
 505       goto out;
 506     }
 507
 508   /* OK, decided on a mechanism - let's do this thing */
 509   mech = g_object_new (auth_mech_to_use_gtype,
 510                        "stream", auth->priv->stream,
 511                        "credentials", credentials_that_were_sent,
 512                        NULL);
 513   debug_print ("CLIENT: Trying mechanism `%s'", _g_dbus_auth_mechanism_get_name (auth_mech_to_use_gtype));
 514   g_ptr_array_add (attempted_auth_mechs, (gpointer) _g_dbus_auth_mechanism_get_name (auth_mech_to_use_gtype));
 515
 516   /* the auth mechanism may not be supported
 517    * (for example, EXTERNAL only works if credentials were exchanged)
 518    */
 519   if (!_g_dbus_auth_mechanism_is_supported (mech))
 520     {
 521       debug_print ("CLIENT: Mechanism `%s' says it is not supported", _g_dbus_auth_mechanism_get_name (auth_mech_to_use_gtype));
 522       g_object_unref (mech);
 523       mech = NULL;
 524       goto again;
 525     }
 526
 527   initial_response_len = -1;
 528   initial_response = _g_dbus_auth_mechanism_client_initiate (mech,
 529                                                              &initial_response_len);
 530 #if 0
 531   g_printerr ("using auth mechanism with name `%s' of type `%s' with initial response `%s'\n",
 532               _g_dbus_auth_mechanism_get_name (auth_mech_to_use_gtype),
 533               g_type_name (G_TYPE_FROM_INSTANCE (mech)),
 534               initial_response);
 535 #endif
 536   if (initial_response != NULL)
 537     {
 538       //g_printerr ("initial_response = `%s'\n", initial_response);
 539       encoded = hexencode (initial_response);
 540       s = g_strdup_printf ("AUTH %s %s\r\n",
 541                            _g_dbus_auth_mechanism_get_name (auth_mech_to_use_gtype),
 542                            encoded);
 543       g_free (initial_response);
 544       g_free (encoded);
 545     }
 546   else
 547     {
 548       s = g_strdup_printf ("AUTH %s\r\n", _g_dbus_auth_mechanism_get_name (auth_mech_to_use_gtype));
 549     }
 550   debug_print ("CLIENT: writing `%s'", s);
 551   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
 552     {
 553       g_object_unref (mech);
 554       mech = NULL;
 555       g_free (s);
 556       goto out;
 557     }
 558   g_free (s);
 559
 560  out:
 561   return mech;
 562 }
 563
 564
 565 /* ---------------------------------------------------------------------------------------------------- */
 566
 567 typedef enum
 568 {
 569   CLIENT_STATE_WAITING_FOR_DATA,
 570   CLIENT_STATE_WAITING_FOR_OK,
 571   CLIENT_STATE_WAITING_FOR_REJECT,
 572   CLIENT_STATE_WAITING_FOR_AGREE_UNIX_FD
 573 } ClientState;
 574
 575 gchar *
 576 _g_dbus_auth_run_client (GDBusAuth     *auth,
 577                          GDBusCapabilityFlags offered_capabilities,
 578                          GDBusCapabilityFlags *out_negotiated_capabilities,
 579                          GCancellable  *cancellable,
 580                          GError       **error)
 581 {
 582   gchar *s;
 583   GDataInputStream *dis;
 584   GDataOutputStream *dos;
 585   GCredentials *credentials;
 586   gchar *ret_guid;
 587   gchar *line;
 588   gsize line_length;
 589   gchar **supported_auth_mechs;
 590   GPtrArray *attempted_auth_mechs;
 591   GDBusAuthMechanism *mech;
 592   ClientState state;
 593   GDBusCapabilityFlags negotiated_capabilities;
 594
 595   debug_print ("CLIENT: initiating");
 596
 597   ret_guid = NULL;
 598   supported_auth_mechs = NULL;
 599   attempted_auth_mechs = g_ptr_array_new ();
 600   mech = NULL;
 601   negotiated_capabilities = 0;
 602   credentials = NULL;
 603
 604   dis = G_DATA_INPUT_STREAM (g_data_input_stream_new (g_io_stream_get_input_stream (auth->priv->stream)));
 605   dos = G_DATA_OUTPUT_STREAM (g_data_output_stream_new (g_io_stream_get_output_stream (auth->priv->stream)));
 606   g_filter_input_stream_set_close_base_stream (G_FILTER_INPUT_STREAM (dis), FALSE);
 607   g_filter_output_stream_set_close_base_stream (G_FILTER_OUTPUT_STREAM (dos), FALSE);
 608
 609   g_data_input_stream_set_newline_type (dis, G_DATA_STREAM_NEWLINE_TYPE_CR_LF);
 610
 611 #ifdef G_OS_UNIX
 612   if (G_IS_UNIX_CONNECTION (auth->priv->stream) && g_unix_credentials_message_is_supported ())
 613     {
 614       credentials = g_credentials_new ();
 615       if (!g_unix_connection_send_credentials (G_UNIX_CONNECTION (auth->priv->stream),
 616                                                cancellable,
 617                                                error))
 618         goto out;
 619     }
 620   else
 621     {
 622       if (!g_data_output_stream_put_byte (dos, '\0', cancellable, error))
 623         goto out;
 624     }
 625 #else
 626   if (!g_data_output_stream_put_byte (dos, '\0', cancellable, error))
 627     goto out;
 628 #endif
 629
 630   if (credentials != NULL)
 631     {
 632       if (G_UNLIKELY (_g_dbus_debug_authentication ()))
 633         {
 634           s = g_credentials_to_string (credentials);
 635           debug_print ("CLIENT: sent credentials `%s'", s);
 636           g_free (s);
 637         }
 638     }
 639   else
 640     {
 641       debug_print ("CLIENT: didn't send any credentials");
 642     }
 643
 644   /* TODO: to reduce roundtrips, try to pick an auth mechanism to start with */
 645
 646   /* Get list of supported authentication mechanisms */
 647   s = "AUTH\r\n";
 648   debug_print ("CLIENT: writing `%s'", s);
 649   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
 650     goto out;
 651   state = CLIENT_STATE_WAITING_FOR_REJECT;
 652
 653   while (TRUE)
 654     {
 655       switch (state)
 656         {
 657         case CLIENT_STATE_WAITING_FOR_REJECT:
 658           debug_print ("CLIENT: WaitingForReject");
 659           line = _my_g_data_input_stream_read_line (dis, &line_length, cancellable, error);
 660           if (line == NULL)
 661             goto out;
 662           debug_print ("CLIENT: WaitingForReject, read '%s'", line);
 663         foobar:
 664           if (!g_str_has_prefix (line, "REJECTED "))
 665             {
 666               g_set_error (error,
 667                            G_IO_ERROR,
 668                            G_IO_ERROR_FAILED,
 669                            "In WaitingForReject: Expected `REJECTED am1 am2 ... amN', got `%s'",
 670                            line);
 671               g_free (line);
 672               goto out;
 673             }
 674           if (supported_auth_mechs == NULL)
 675             {
 676               supported_auth_mechs = g_strsplit (line + sizeof ("REJECTED ") - 1, " ", 0);
 677 #if 0
 678               for (n = 0; supported_auth_mechs != NULL && supported_auth_mechs[n] != NULL; n++)
 679                 g_printerr ("supported_auth_mechs[%d] = `%s'\n", n, supported_auth_mechs[n]);
 680 #endif
 681             }
 682           g_free (line);
 683           mech = client_choose_mech_and_send_initial_response (auth,
 684                                                                credentials,
 685                                                                (const gchar* const *) supported_auth_mechs,
 686                                                                attempted_auth_mechs,
 687                                                                dos,
 688                                                                cancellable,
 689                                                                error);
 690           if (mech == NULL)
 691             goto out;
 692           if (_g_dbus_auth_mechanism_client_get_state (mech) == G_DBUS_AUTH_MECHANISM_STATE_WAITING_FOR_DATA)
 693             state = CLIENT_STATE_WAITING_FOR_DATA;
 694           else
 695             state = CLIENT_STATE_WAITING_FOR_OK;
 696           break;
 697
 698         case CLIENT_STATE_WAITING_FOR_OK:
 699           debug_print ("CLIENT: WaitingForOK");
 700           line = _my_g_data_input_stream_read_line (dis, &line_length, cancellable, error);
 701           if (line == NULL)
 702             goto out;
 703           debug_print ("CLIENT: WaitingForOK, read `%s'", line);
 704           if (g_str_has_prefix (line, "OK "))
 705             {
 706               if (!g_dbus_is_guid (line + 3))
 707                 {
 708                   g_set_error (error,
 709                                G_IO_ERROR,
 710                                G_IO_ERROR_FAILED,
 711                                "Invalid OK response `%s'",
 712                                line);
 713                   g_free (line);
 714                   goto out;
 715                 }
 716               ret_guid = g_strdup (line + 3);
 717               g_free (line);
 718
 719               if (offered_capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING)
 720                 {
 721                   s = "NEGOTIATE_UNIX_FD\r\n";
 722                   debug_print ("CLIENT: writing `%s'", s);
 723                   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
 724                     goto out;
 725                   state = CLIENT_STATE_WAITING_FOR_AGREE_UNIX_FD;
 726                 }
 727               else
 728                 {
 729                   s = "BEGIN\r\n";
 730                   debug_print ("CLIENT: writing `%s'", s);
 731                   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
 732                     goto out;
 733                   /* and we're done! */
 734                   goto out;
 735                 }
 736             }
 737           else if (g_str_has_prefix (line, "REJECTED "))
 738             {
 739               goto foobar;
 740             }
 741           else
 742             {
 743               /* TODO: handle other valid responses */
 744               g_set_error (error,
 745                            G_IO_ERROR,
 746                            G_IO_ERROR_FAILED,
 747                            "In WaitingForOk: unexpected response `%s'",
 748                            line);
 749               g_free (line);
 750               goto out;
 751             }
 752           break;
 753
 754         case CLIENT_STATE_WAITING_FOR_AGREE_UNIX_FD:
 755           debug_print ("CLIENT: WaitingForAgreeUnixFD");
 756           line = _my_g_data_input_stream_read_line (dis, &line_length, cancellable, error);
 757           if (line == NULL)
 758             goto out;
 759           debug_print ("CLIENT: WaitingForAgreeUnixFD, read=`%s'", line);
 760           if (g_strcmp0 (line, "AGREE_UNIX_FD") == 0)
 761             {
 762               negotiated_capabilities |= G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING;
 763               s = "BEGIN\r\n";
 764               debug_print ("CLIENT: writing `%s'", s);
 765               if (!g_data_output_stream_put_string (dos, s, cancellable, error))
 766                 goto out;
 767               /* and we're done! */
 768               goto out;
 769             }
 770           else if (g_str_has_prefix (line, "ERROR") && (line[5] == 0 || g_ascii_isspace (line[5])))
 771             {
 772               //g_strstrip (line + 5); g_debug ("bah, no unix_fd: `%s'", line + 5);
 773               g_free (line);
 774               s = "BEGIN\r\n";
 775               debug_print ("CLIENT: writing `%s'", s);
 776               if (!g_data_output_stream_put_string (dos, s, cancellable, error))
 777                 goto out;
 778               /* and we're done! */
 779               goto out;
 780             }
 781           else
 782             {
 783               /* TODO: handle other valid responses */
 784               g_set_error (error,
 785                            G_IO_ERROR,
 786                            G_IO_ERROR_FAILED,
 787                            "In WaitingForAgreeUnixFd: unexpected response `%s'",
 788                            line);
 789               g_free (line);
 790               goto out;
 791             }
 792           break;
 793
 794         case CLIENT_STATE_WAITING_FOR_DATA:
 795           debug_print ("CLIENT: WaitingForData");
 796           line = _my_g_data_input_stream_read_line (dis, &line_length, cancellable, error);
 797           if (line == NULL)
 798             goto out;
 799           debug_print ("CLIENT: WaitingForData, read=`%s'", line);
 800           if (g_str_has_prefix (line, "DATA "))
 801             {
 802               gchar *encoded;
 803               gchar *decoded_data;
 804               gsize decoded_data_len;
 805
 806               encoded = g_strdup (line + 5);
 807               g_free (line);
 808               g_strstrip (encoded);
 809               decoded_data = hexdecode (encoded, &decoded_data_len, error);
 810               g_free (encoded);
 811               if (decoded_data == NULL)
 812                 {
 813                   g_prefix_error (error, "DATA response is malformed: ");
 814                   /* invalid encoding, disconnect! */
 815                   goto out;
 816                 }
 817               _g_dbus_auth_mechanism_client_data_receive (mech, decoded_data, decoded_data_len);
 818               g_free (decoded_data);
 819
 820               if (_g_dbus_auth_mechanism_client_get_state (mech) == G_DBUS_AUTH_MECHANISM_STATE_HAVE_DATA_TO_SEND)
 821                 {
 822                   gchar *data;
 823                   gsize data_len;
 824                   gchar *encoded_data;
 825                   data = _g_dbus_auth_mechanism_client_data_send (mech, &data_len);
 826                   encoded_data = hexencode (data);
 827                   s = g_strdup_printf ("DATA %s\r\n", encoded_data);
 828                   g_free (encoded_data);
 829                   g_free (data);
 830                   debug_print ("CLIENT: writing `%s'", s);
 831                   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
 832                     {
 833                       g_free (s);
 834                       goto out;
 835                     }
 836                   g_free (s);
 837                 }
 838               state = CLIENT_STATE_WAITING_FOR_OK;
 839             }
 840           else
 841             {
 842               g_set_error (error,
 843                            G_IO_ERROR,
 844                            G_IO_ERROR_FAILED,
 845                            "In WaitingForData: unexpected response `%s'",
 846                            line);
 847               g_free (line);
 848               goto out;
 849             }
 850           break;
 851
 852         default:
 853           g_assert_not_reached ();
 854           break;
 855         }
 856
 857     }; /* main authentication client loop */
 858
 859  out:
 860   if (mech != NULL)
 861     g_object_unref (mech);
 862   g_ptr_array_unref (attempted_auth_mechs);
 863   g_strfreev (supported_auth_mechs);
 864   g_object_unref (dis);
 865   g_object_unref (dos);
 866
 867   /* ensure return value is NULL if error is set */
 868   if (error != NULL && *error != NULL)
 869     {
 870       g_free (ret_guid);
 871       ret_guid = NULL;
 872     }
 873
 874   if (ret_guid != NULL)
 875     {
 876       if (out_negotiated_capabilities != NULL)
 877         *out_negotiated_capabilities = negotiated_capabilities;
 878     }
 879
 880   if (credentials != NULL)
 881     g_object_unref (credentials);
 882
 883   debug_print ("CLIENT: Done, authenticated=%d", ret_guid != NULL);
 884
 885   return ret_guid;
 886 }
 887
 888 /* ---------------------------------------------------------------------------------------------------- */
 889
 890 static gchar *
 891 get_auth_mechanisms (GDBusAuth     *auth,
 892                      gboolean       allow_anonymous,
 893                      const gchar   *prefix,
 894                      const gchar   *suffix,
 895                      const gchar   *separator)
 896 {
 897   GList *l;
 898   GString *str;
 899   gboolean need_sep;
 900
 901   str = g_string_new (prefix);
 902   need_sep = FALSE;
 903   for (l = auth->priv->available_mechanisms; l != NULL; l = l->next)
 904     {
 905       Mechanism *m = l->data;
 906
 907       if (!allow_anonymous && g_strcmp0 (m->name, "ANONYMOUS") == 0)
 908         continue;
 909
 910       if (need_sep)
 911         g_string_append (str, separator);
 912       g_string_append (str, m->name);
 913       need_sep = TRUE;
 914     }
 915
 916   g_string_append (str, suffix);
 917   return g_string_free (str, FALSE);
 918 }
 919
 920
 921 typedef enum
 922 {
 923   SERVER_STATE_WAITING_FOR_AUTH,
 924   SERVER_STATE_WAITING_FOR_DATA,
 925   SERVER_STATE_WAITING_FOR_BEGIN
 926 } ServerState;
 927
 928 gboolean
 929 _g_dbus_auth_run_server (GDBusAuth              *auth,
 930                          GDBusAuthObserver      *observer,
 931                          const gchar            *guid,
 932                          gboolean                allow_anonymous,
 933                          GDBusCapabilityFlags    offered_capabilities,
 934                          GDBusCapabilityFlags   *out_negotiated_capabilities,
 935                          GCredentials          **out_received_credentials,
 936                          GCancellable           *cancellable,
 937                          GError                **error)
 938 {
 939   gboolean ret;
 940   ServerState state;
 941   GDataInputStream *dis;
 942   GDataOutputStream *dos;
 943   GError *local_error;
 944   guchar byte;
 945   gchar *line;
 946   gsize line_length;
 947   GDBusAuthMechanism *mech;
 948   gchar *s;
 949   GDBusCapabilityFlags negotiated_capabilities;
 950   GCredentials *credentials;
 951
 952   debug_print ("SERVER: initiating");
 953
 954   ret = FALSE;
 955   dis = NULL;
 956   dos = NULL;
 957   mech = NULL;
 958   negotiated_capabilities = 0;
 959   credentials = NULL;
 960
 961   if (!g_dbus_is_guid (guid))
 962     {
 963       g_set_error (error,
 964                    G_IO_ERROR,
 965                    G_IO_ERROR_FAILED,
 966                    "The given guid `%s' is not valid",
 967                    guid);
 968       goto out;
 969     }
 970
 971   dis = G_DATA_INPUT_STREAM (g_data_input_stream_new (g_io_stream_get_input_stream (auth->priv->stream)));
 972   dos = G_DATA_OUTPUT_STREAM (g_data_output_stream_new (g_io_stream_get_output_stream (auth->priv->stream)));
 973   g_filter_input_stream_set_close_base_stream (G_FILTER_INPUT_STREAM (dis), FALSE);
 974   g_filter_output_stream_set_close_base_stream (G_FILTER_OUTPUT_STREAM (dos), FALSE);
 975
 976   g_data_input_stream_set_newline_type (dis, G_DATA_STREAM_NEWLINE_TYPE_CR_LF);
 977
 978   /* first read the NUL-byte (TODO: read credentials if using a unix domain socket) */
 979 #ifdef G_OS_UNIX
 980   if (G_IS_UNIX_CONNECTION (auth->priv->stream) && g_unix_credentials_message_is_supported ())
 981     {
 982       local_error = NULL;
 983       credentials = g_unix_connection_receive_credentials (G_UNIX_CONNECTION (auth->priv->stream),
 984                                                            cancellable,
 985                                                            &local_error);
 986       if (credentials == NULL)
 987         {
 988           g_propagate_error (error, local_error);
 989           goto out;
 990         }
 991     }
 992   else
 993     {
 994       local_error = NULL;
 995       byte = g_data_input_stream_read_byte (dis, cancellable, &local_error);
 996       if (local_error != NULL)
 997         {
 998           g_propagate_error (error, local_error);
 999           goto out;
1000         }
1001     }
1002 #else
1003   local_error = NULL;
1004   byte = g_data_input_stream_read_byte (dis, cancellable, &local_error);
1005   if (local_error != NULL)
1006     {
1007       g_propagate_error (error, local_error);
1008       goto out;
1009     }
1010 #endif
1011   if (credentials != NULL)
1012     {
1013       if (G_UNLIKELY (_g_dbus_debug_authentication ()))
1014         {
1015           s = g_credentials_to_string (credentials);
1016           debug_print ("SERVER: received credentials `%s'", s);
1017           g_free (s);
1018         }
1019     }
1020   else
1021     {
1022       debug_print ("SERVER: didn't receive any credentials");
1023     }
1024
1025   state = SERVER_STATE_WAITING_FOR_AUTH;
1026   while (TRUE)
1027     {
1028       switch (state)
1029         {
1030         case SERVER_STATE_WAITING_FOR_AUTH:
1031           debug_print ("SERVER: WaitingForAuth");
1032           line = _my_g_data_input_stream_read_line (dis, &line_length, cancellable, error);
1033           debug_print ("SERVER: WaitingForAuth, read `%s'", line);
1034           if (line == NULL)
1035             goto out;
1036           if (g_strcmp0 (line, "AUTH") == 0)
1037             {
1038               s = get_auth_mechanisms (auth, allow_anonymous, "REJECTED ", "\r\n", " ");
1039               debug_print ("SERVER: writing `%s'", s);
1040               if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1041                 {
1042                   g_free (s);
1043                   goto out;
1044                 }
1045               g_free (s);
1046               g_free (line);
1047             }
1048           else if (g_str_has_prefix (line, "AUTH "))
1049             {
1050               gchar **tokens;
1051               const gchar *encoded;
1052               const gchar *mech_name;
1053               GType auth_mech_to_use_gtype;
1054
1055               tokens = g_strsplit (line, " ", 0);
1056               g_free (line);
1057
1058               switch (g_strv_length (tokens))
1059                 {
1060                 case 2:
1061                   /* no initial response */
1062                   mech_name = tokens[1];
1063                   encoded = NULL;
1064                   break;
1065
1066                 case 3:
1067                   /* initial response */
1068                   mech_name = tokens[1];
1069                   encoded = tokens[2];
1070                   break;
1071
1072                 default:
1073                   g_set_error (error,
1074                                G_IO_ERROR,
1075                                G_IO_ERROR_FAILED,
1076                                "Unexpected line `%s' while in WaitingForAuth state",
1077                                line);
1078                   g_strfreev (tokens);
1079                   goto out;
1080                 }
1081
1082               /* TODO: record that the client has attempted to use this mechanism */
1083               //g_debug ("client is trying `%s'", mech_name);
1084
1085               auth_mech_to_use_gtype = find_mech_by_name (auth, mech_name);
1086               if ((auth_mech_to_use_gtype == (GType) 0) ||
1087                   (!allow_anonymous && g_strcmp0 (mech_name, "ANONYMOUS") == 0))
1088                 {
1089                   /* We don't support this auth mechanism */
1090                   g_strfreev (tokens);
1091                   s = get_auth_mechanisms (auth, allow_anonymous, "REJECTED ", "\r\n", " ");
1092                   debug_print ("SERVER: writing `%s'", s);
1093                   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1094                     {
1095                       g_free (s);
1096                       goto out;
1097                     }
1098                   g_free (s);
1099
1100                   /* stay in WAITING FOR AUTH */
1101                   state = SERVER_STATE_WAITING_FOR_AUTH;
1102                 }
1103               else
1104                 {
1105                   gchar *initial_response;
1106                   gsize initial_response_len;
1107
1108                   mech = g_object_new (auth_mech_to_use_gtype,
1109                                        "stream", auth->priv->stream,
1110                                        "credentials", credentials,
1111                                        NULL);
1112
1113                   initial_response = NULL;
1114                   initial_response_len = 0;
1115                   if (encoded != NULL)
1116                     {
1117                       initial_response = hexdecode (encoded, &initial_response_len, error);
1118                       if (initial_response == NULL)
1119                         {
1120                           g_prefix_error (error, "Initial response is malformed: ");
1121                           /* invalid encoding, disconnect! */
1122                           g_strfreev (tokens);
1123                           goto out;
1124                         }
1125                     }
1126
1127                   _g_dbus_auth_mechanism_server_initiate (mech,
1128                                                           initial_response,
1129                                                           initial_response_len);
1130                   g_free (initial_response);
1131                   g_strfreev (tokens);
1132
1133                 change_state:
1134                   switch (_g_dbus_auth_mechanism_server_get_state (mech))
1135                     {
1136                     case G_DBUS_AUTH_MECHANISM_STATE_ACCEPTED:
1137                       if (observer != NULL &&
1138                           !g_dbus_auth_observer_authorize_authenticated_peer (observer,
1139                                                                               auth->priv->stream,
1140                                                                               credentials))
1141                         {
1142                           /* disconnect */
1143                           g_set_error_literal (error,
1144                                                G_IO_ERROR,
1145                                                G_IO_ERROR_FAILED,
1146                                                _("Cancelled via GDBusAuthObserver::authorize-authenticated-peer"));
1147                           goto out;
1148                         }
1149                       else
1150                         {
1151                           s = g_strdup_printf ("OK %s\r\n", guid);
1152                           debug_print ("SERVER: writing `%s'", s);
1153                           if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1154                             {
1155                               g_free (s);
1156                               goto out;
1157                             }
1158                           g_free (s);
1159                           state = SERVER_STATE_WAITING_FOR_BEGIN;
1160                         }
1161                       break;
1162
1163                     case G_DBUS_AUTH_MECHANISM_STATE_REJECTED:
1164                       s = get_auth_mechanisms (auth, allow_anonymous, "REJECTED ", "\r\n", " ");
1165                       debug_print ("SERVER: writing `%s'", s);
1166                       if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1167                         {
1168                           g_free (s);
1169                           goto out;
1170                         }
1171                       g_free (s);
1172                       state = SERVER_STATE_WAITING_FOR_AUTH;
1173                       break;
1174
1175                     case G_DBUS_AUTH_MECHANISM_STATE_WAITING_FOR_DATA:
1176                       state = SERVER_STATE_WAITING_FOR_DATA;
1177                       break;
1178
1179                     case G_DBUS_AUTH_MECHANISM_STATE_HAVE_DATA_TO_SEND:
1180                       {
1181                         gchar *data;
1182                         gsize data_len;
1183                         gchar *encoded_data;
1184                         data = _g_dbus_auth_mechanism_server_data_send (mech, &data_len);
1185                         encoded_data = hexencode (data);
1186                         s = g_strdup_printf ("DATA %s\r\n", encoded_data);
1187                         g_free (encoded_data);
1188                         g_free (data);
1189                         debug_print ("SERVER: writing `%s'", s);
1190                         if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1191                           {
1192                             g_free (s);
1193                             goto out;
1194                           }
1195                         g_free (s);
1196                       }
1197                       goto change_state;
1198                       break;
1199
1200                     default:
1201                       /* TODO */
1202                       g_assert_not_reached ();
1203                       break;
1204                     }
1205                 }
1206             }
1207           else
1208             {
1209               g_set_error (error,
1210                            G_IO_ERROR,
1211                            G_IO_ERROR_FAILED,
1212                            "Unexpected line `%s' while in WaitingForAuth state",
1213                            line);
1214               g_free (line);
1215               goto out;
1216             }
1217           break;
1218
1219         case SERVER_STATE_WAITING_FOR_DATA:
1220           debug_print ("SERVER: WaitingForData");
1221           line = _my_g_data_input_stream_read_line (dis, &line_length, cancellable, error);
1222           debug_print ("SERVER: WaitingForData, read `%s'", line);
1223           if (line == NULL)
1224             goto out;
1225           if (g_str_has_prefix (line, "DATA "))
1226             {
1227               gchar *encoded;
1228               gchar *decoded_data;
1229               gsize decoded_data_len;
1230
1231               encoded = g_strdup (line + 5);
1232               g_free (line);
1233               g_strstrip (encoded);
1234               decoded_data = hexdecode (encoded, &decoded_data_len, error);
1235               g_free (encoded);
1236               if (decoded_data == NULL)
1237                 {
1238                   g_prefix_error (error, "DATA response is malformed: ");
1239                   /* invalid encoding, disconnect! */
1240                   goto out;
1241                 }
1242               _g_dbus_auth_mechanism_server_data_receive (mech, decoded_data, decoded_data_len);
1243               g_free (decoded_data);
1244               /* oh man, this goto-crap is so ugly.. really need to rewrite the state machine */
1245               goto change_state;
1246             }
1247           else
1248             {
1249               g_set_error (error,
1250                            G_IO_ERROR,
1251                            G_IO_ERROR_FAILED,
1252                            "Unexpected line `%s' while in WaitingForData state",
1253                            line);
1254               g_free (line);
1255             }
1256           goto out;
1257
1258         case SERVER_STATE_WAITING_FOR_BEGIN:
1259           debug_print ("SERVER: WaitingForBegin");
1260           /* Use extremely slow (but reliable) line reader - this basically
1261            * does a recvfrom() system call per character
1262            *
1263            * (the problem with using GDataInputStream's read_line is that because of
1264            * buffering it might start reading into the first D-Bus message that
1265            * appears after "BEGIN\r\n"....)
1266            */
1267           line = _my_g_input_stream_read_line_safe (g_io_stream_get_input_stream (auth->priv->stream),
1268                                                     &line_length,
1269                                                     cancellable,
1270                                                     error);
1271           debug_print ("SERVER: WaitingForBegin, read `%s'", line);
1272           if (line == NULL)
1273             goto out;
1274           if (g_strcmp0 (line, "BEGIN") == 0)
1275             {
1276               /* YAY, done! */
1277               ret = TRUE;
1278               g_free (line);
1279               goto out;
1280             }
1281           else if (g_strcmp0 (line, "NEGOTIATE_UNIX_FD") == 0)
1282             {
1283               g_free (line);
1284               if (offered_capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING)
1285                 {
1286                   negotiated_capabilities |= G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING;
1287                   s = "AGREE_UNIX_FD\r\n";
1288                   debug_print ("SERVER: writing `%s'", s);
1289                   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1290                     goto out;
1291                 }
1292               else
1293                 {
1294                   s = "ERROR \"fd passing not offered\"\r\n";
1295                   debug_print ("SERVER: writing `%s'", s);
1296                   if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1297                     goto out;
1298                 }
1299             }
1300           else
1301             {
1302               g_debug ("Unexpected line `%s' while in WaitingForBegin state", line);
1303               g_free (line);
1304               s = "ERROR \"Unknown Command\"\r\n";
1305               debug_print ("SERVER: writing `%s'", s);
1306               if (!g_data_output_stream_put_string (dos, s, cancellable, error))
1307                 goto out;
1308             }
1309           break;
1310
1311         default:
1312           g_assert_not_reached ();
1313           break;
1314         }
1315     }
1316
1317
1318   g_set_error_literal (error,
1319                        G_IO_ERROR,
1320                        G_IO_ERROR_FAILED,
1321                        "Not implemented (server)");
1322
1323  out:
1324   if (mech != NULL)
1325     g_object_unref (mech);
1326   if (dis != NULL)
1327     g_object_unref (dis);
1328   if (dos != NULL)
1329     g_object_unref (dos);
1330
1331   /* ensure return value is FALSE if error is set */
1332   if (error != NULL && *error != NULL)
1333     {
1334       ret = FALSE;
1335     }
1336
1337   if (ret)
1338     {
1339       if (out_negotiated_capabilities != NULL)
1340         *out_negotiated_capabilities = negotiated_capabilities;
1341       if (out_received_credentials != NULL)
1342         *out_received_credentials = credentials != NULL ? g_object_ref (credentials) : NULL;
1343     }
1344
1345   if (credentials != NULL)
1346     g_object_unref (credentials);
1347
1348   debug_print ("SERVER: Done, authenticated=%d", ret);
1349
1350   return ret;
1351 }
1352
1353 /* ---------------------------------------------------------------------------------------------------- */
1354
1355 #define __G_DBUS_AUTH_C__
1356 #include "gioaliasdef.c"