D-Bus  1.10.32
dbus-auth.c
1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-auth.c Authentication
3  *
4  * Copyright (C) 2002, 2003, 2004 Red Hat Inc.
5  *
6  * Licensed under the Academic Free License version 2.1
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  *
22  */
23 
24 #include <config.h>
25 #include "dbus-auth.h"
26 #include "dbus-string.h"
27 #include "dbus-list.h"
28 #include "dbus-internals.h"
29 #include "dbus-keyring.h"
30 #include "dbus-sha.h"
31 #include "dbus-protocol.h"
32 #include "dbus-credentials.h"
33 
71  DBusString *response);
72 
78  const DBusString *data);
79 
84  const DBusString *data,
85  DBusString *encoded);
86 
91  const DBusString *data,
92  DBusString *decoded);
93 
97 typedef void (* DBusAuthShutdownFunction) (DBusAuth *auth);
98 
102 typedef struct
103 {
104  const char *mechanism;
115 
119 typedef enum {
120  DBUS_AUTH_COMMAND_AUTH,
121  DBUS_AUTH_COMMAND_CANCEL,
122  DBUS_AUTH_COMMAND_DATA,
123  DBUS_AUTH_COMMAND_BEGIN,
124  DBUS_AUTH_COMMAND_REJECTED,
125  DBUS_AUTH_COMMAND_OK,
126  DBUS_AUTH_COMMAND_ERROR,
127  DBUS_AUTH_COMMAND_UNKNOWN,
128  DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD,
129  DBUS_AUTH_COMMAND_AGREE_UNIX_FD
131 
138  DBusAuthCommand command,
139  const DBusString *args);
140 
144 typedef struct
145 {
146  const char *name;
149 
153 struct DBusAuth
154 {
155  int refcount;
156  const char *side;
178  int cookie_id;
181  char **allowed_mechs;
185  unsigned int needed_memory : 1;
188  unsigned int already_got_mechanisms : 1;
190  unsigned int buffer_outstanding : 1;
192  unsigned int unix_fd_possible : 1;
193  unsigned int unix_fd_negotiated : 1;
194 };
195 
199 typedef struct
200 {
208 
212 typedef struct
213 {
216  int failures;
222 
223 static void goto_state (DBusAuth *auth,
224  const DBusAuthStateData *new_state);
225 static dbus_bool_t send_auth (DBusAuth *auth,
227 static dbus_bool_t send_data (DBusAuth *auth,
228  DBusString *data);
229 static dbus_bool_t send_rejected (DBusAuth *auth);
230 static dbus_bool_t send_error (DBusAuth *auth,
231  const char *message);
232 static dbus_bool_t send_ok (DBusAuth *auth);
233 static dbus_bool_t send_begin (DBusAuth *auth);
234 static dbus_bool_t send_cancel (DBusAuth *auth);
235 static dbus_bool_t send_negotiate_unix_fd (DBusAuth *auth);
236 static dbus_bool_t send_agree_unix_fd (DBusAuth *auth);
237 
242 static dbus_bool_t handle_server_state_waiting_for_auth (DBusAuth *auth,
243  DBusAuthCommand command,
244  const DBusString *args);
245 static dbus_bool_t handle_server_state_waiting_for_data (DBusAuth *auth,
246  DBusAuthCommand command,
247  const DBusString *args);
248 static dbus_bool_t handle_server_state_waiting_for_begin (DBusAuth *auth,
249  DBusAuthCommand command,
250  const DBusString *args);
251 
252 static const DBusAuthStateData server_state_waiting_for_auth = {
253  "WaitingForAuth", handle_server_state_waiting_for_auth
254 };
255 static const DBusAuthStateData server_state_waiting_for_data = {
256  "WaitingForData", handle_server_state_waiting_for_data
257 };
258 static const DBusAuthStateData server_state_waiting_for_begin = {
259  "WaitingForBegin", handle_server_state_waiting_for_begin
260 };
261 
266 static dbus_bool_t handle_client_state_waiting_for_data (DBusAuth *auth,
267  DBusAuthCommand command,
268  const DBusString *args);
269 static dbus_bool_t handle_client_state_waiting_for_ok (DBusAuth *auth,
270  DBusAuthCommand command,
271  const DBusString *args);
272 static dbus_bool_t handle_client_state_waiting_for_reject (DBusAuth *auth,
273  DBusAuthCommand command,
274  const DBusString *args);
275 static dbus_bool_t handle_client_state_waiting_for_agree_unix_fd (DBusAuth *auth,
276  DBusAuthCommand command,
277  const DBusString *args);
278 
279 static const DBusAuthStateData client_state_need_send_auth = {
280  "NeedSendAuth", NULL
281 };
282 static const DBusAuthStateData client_state_waiting_for_data = {
283  "WaitingForData", handle_client_state_waiting_for_data
284 };
285 /* The WaitingForOK state doesn't appear to be used.
286  * See https://bugs.freedesktop.org/show_bug.cgi?id=97298 */
287 _DBUS_GNUC_UNUSED
288 static const DBusAuthStateData client_state_waiting_for_ok = {
289  "WaitingForOK", handle_client_state_waiting_for_ok
290 };
291 static const DBusAuthStateData client_state_waiting_for_reject = {
292  "WaitingForReject", handle_client_state_waiting_for_reject
293 };
294 static const DBusAuthStateData client_state_waiting_for_agree_unix_fd = {
295  "WaitingForAgreeUnixFD", handle_client_state_waiting_for_agree_unix_fd
296 };
297 
302 static const DBusAuthStateData common_state_authenticated = {
303  "Authenticated", NULL
304 };
305 
306 static const DBusAuthStateData common_state_need_disconnect = {
307  "NeedDisconnect", NULL
308 };
309 
310 static const char auth_side_client[] = "client";
311 static const char auth_side_server[] = "server";
316 #define DBUS_AUTH_IS_SERVER(auth) ((auth)->side == auth_side_server)
317 
321 #define DBUS_AUTH_IS_CLIENT(auth) ((auth)->side == auth_side_client)
322 
326 #define DBUS_AUTH_CLIENT(auth) ((DBusAuthClient*)(auth))
327 
331 #define DBUS_AUTH_SERVER(auth) ((DBusAuthServer*)(auth))
332 
338 #define DBUS_AUTH_NAME(auth) ((auth)->side)
339 
340 static DBusAuth*
341 _dbus_auth_new (int size)
342 {
343  DBusAuth *auth;
344 
345  auth = dbus_malloc0 (size);
346  if (auth == NULL)
347  return NULL;
348 
349  auth->refcount = 1;
350 
351  auth->keyring = NULL;
352  auth->cookie_id = -1;
353 
354  /* note that we don't use the max string length feature,
355  * because you can't use that feature if you're going to
356  * try to recover from out-of-memory (it creates
357  * what looks like unrecoverable inability to alloc
358  * more space in the string). But we do handle
359  * overlong buffers in _dbus_auth_do_work().
360  */
361 
362  if (!_dbus_string_init (&auth->incoming))
363  goto enomem_0;
364 
365  if (!_dbus_string_init (&auth->outgoing))
366  goto enomem_1;
367 
368  if (!_dbus_string_init (&auth->identity))
369  goto enomem_2;
370 
371  if (!_dbus_string_init (&auth->context))
372  goto enomem_3;
373 
374  if (!_dbus_string_init (&auth->challenge))
375  goto enomem_4;
376 
377  /* default context if none is specified */
378  if (!_dbus_string_append (&auth->context, "org_freedesktop_general"))
379  goto enomem_5;
380 
382  if (auth->credentials == NULL)
383  goto enomem_6;
384 
386  if (auth->authorized_identity == NULL)
387  goto enomem_7;
388 
390  if (auth->desired_identity == NULL)
391  goto enomem_8;
392 
393  return auth;
394 
395 #if 0
396  enomem_9:
398 #endif
399  enomem_8:
401  enomem_7:
403  enomem_6:
404  /* last alloc was an append to context, which is freed already below */ ;
405  enomem_5:
406  _dbus_string_free (&auth->challenge);
407  enomem_4:
408  _dbus_string_free (&auth->context);
409  enomem_3:
410  _dbus_string_free (&auth->identity);
411  enomem_2:
412  _dbus_string_free (&auth->outgoing);
413  enomem_1:
414  _dbus_string_free (&auth->incoming);
415  enomem_0:
416  dbus_free (auth);
417  return NULL;
418 }
419 
420 static void
421 shutdown_mech (DBusAuth *auth)
422 {
423  /* Cancel any auth */
425  _dbus_string_set_length (&auth->identity, 0);
426 
429 
430  if (auth->mech != NULL)
431  {
432  _dbus_verbose ("%s: Shutting down mechanism %s\n",
433  DBUS_AUTH_NAME (auth), auth->mech->mechanism);
434 
435  if (DBUS_AUTH_IS_CLIENT (auth))
436  (* auth->mech->client_shutdown_func) (auth);
437  else
438  (* auth->mech->server_shutdown_func) (auth);
439 
440  auth->mech = NULL;
441  }
442 }
443 
444 /*
445  * DBUS_COOKIE_SHA1 mechanism
446  */
447 
448 /* Returns TRUE but with an empty string hash if the
449  * cookie_id isn't known. As with all this code
450  * TRUE just means we had enough memory.
451  */
452 static dbus_bool_t
453 sha1_compute_hash (DBusAuth *auth,
454  int cookie_id,
455  const DBusString *server_challenge,
456  const DBusString *client_challenge,
457  DBusString *hash)
458 {
459  DBusString cookie;
460  DBusString to_hash;
461  dbus_bool_t retval;
462 
463  _dbus_assert (auth->keyring != NULL);
464 
465  retval = FALSE;
466 
467  if (!_dbus_string_init (&cookie))
468  return FALSE;
469 
471  &cookie))
472  goto out_0;
473 
474  if (_dbus_string_get_length (&cookie) == 0)
475  {
476  retval = TRUE;
477  goto out_0;
478  }
479 
480  if (!_dbus_string_init (&to_hash))
481  goto out_0;
482 
483  if (!_dbus_string_copy (server_challenge, 0,
484  &to_hash, _dbus_string_get_length (&to_hash)))
485  goto out_1;
486 
487  if (!_dbus_string_append (&to_hash, ":"))
488  goto out_1;
489 
490  if (!_dbus_string_copy (client_challenge, 0,
491  &to_hash, _dbus_string_get_length (&to_hash)))
492  goto out_1;
493 
494  if (!_dbus_string_append (&to_hash, ":"))
495  goto out_1;
496 
497  if (!_dbus_string_copy (&cookie, 0,
498  &to_hash, _dbus_string_get_length (&to_hash)))
499  goto out_1;
500 
501  if (!_dbus_sha_compute (&to_hash, hash))
502  goto out_1;
503 
504  retval = TRUE;
505 
506  out_1:
507  _dbus_string_zero (&to_hash);
508  _dbus_string_free (&to_hash);
509  out_0:
510  _dbus_string_zero (&cookie);
511  _dbus_string_free (&cookie);
512  return retval;
513 }
514 
519 #define N_CHALLENGE_BYTES (128/8)
520 
521 static dbus_bool_t
522 sha1_handle_first_client_response (DBusAuth *auth,
523  const DBusString *data)
524 {
525  /* We haven't sent a challenge yet, we're expecting a desired
526  * username from the client.
527  */
528  DBusString tmp;
529  DBusString tmp2;
530  dbus_bool_t retval = FALSE;
531  DBusError error = DBUS_ERROR_INIT;
532  DBusCredentials *myself = NULL;
533 
535 
536  if (_dbus_string_get_length (data) > 0)
537  {
538  if (_dbus_string_get_length (&auth->identity) > 0)
539  {
540  /* Tried to send two auth identities, wtf */
541  _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
542  DBUS_AUTH_NAME (auth));
543  return send_rejected (auth);
544  }
545  else
546  {
547  /* this is our auth identity */
548  if (!_dbus_string_copy (data, 0, &auth->identity, 0))
549  return FALSE;
550  }
551  }
552 
554  {
555  _dbus_verbose ("%s: Did not get a valid username from client\n",
556  DBUS_AUTH_NAME (auth));
557  return send_rejected (auth);
558  }
559 
560  if (!_dbus_string_init (&tmp))
561  return FALSE;
562 
563  if (!_dbus_string_init (&tmp2))
564  {
565  _dbus_string_free (&tmp);
566  return FALSE;
567  }
568 
570 
571  if (myself == NULL)
572  goto out;
573 
574  if (!_dbus_credentials_same_user (myself, auth->desired_identity))
575  {
576  /*
577  * DBUS_COOKIE_SHA1 is not suitable for authenticating that the
578  * client is anyone other than the user owning the process
579  * containing the DBusServer: we probably aren't allowed to write
580  * to other users' home directories. Even if we can (for example
581  * uid 0 on traditional Unix or CAP_DAC_OVERRIDE on Linux), we
582  * must not, because the other user controls their home directory,
583  * and could carry out symlink attacks to make us read from or
584  * write to unintended locations. It's difficult to avoid symlink
585  * attacks in a portable way, so we just don't try. This isn't a
586  * regression, because DBUS_COOKIE_SHA1 never worked for other
587  * users anyway.
588  */
589  _dbus_verbose ("%s: client tried to authenticate as \"%s\", "
590  "but that doesn't match this process",
591  DBUS_AUTH_NAME (auth),
592  _dbus_string_get_const_data (data));
593  retval = send_rejected (auth);
594  goto out;
595  }
596 
597  /* we cache the keyring for speed, so here we drop it if it's the
598  * wrong one. FIXME caching the keyring here is useless since we use
599  * a different DBusAuth for every connection.
600  */
601  if (auth->keyring &&
603  auth->desired_identity))
604  {
606  auth->keyring = NULL;
607  }
608 
609  if (auth->keyring == NULL)
610  {
612  &auth->context,
613  &error);
614 
615  if (auth->keyring == NULL)
616  {
617  if (dbus_error_has_name (&error,
619  {
620  dbus_error_free (&error);
621  goto out;
622  }
623  else
624  {
625  _DBUS_ASSERT_ERROR_IS_SET (&error);
626  _dbus_verbose ("%s: Error loading keyring: %s\n",
627  DBUS_AUTH_NAME (auth), error.message);
628  if (send_rejected (auth))
629  retval = TRUE; /* retval is only about mem */
630  dbus_error_free (&error);
631  goto out;
632  }
633  }
634  else
635  {
636  _dbus_assert (!dbus_error_is_set (&error));
637  }
638  }
639 
640  _dbus_assert (auth->keyring != NULL);
641 
642  auth->cookie_id = _dbus_keyring_get_best_key (auth->keyring, &error);
643  if (auth->cookie_id < 0)
644  {
645  _DBUS_ASSERT_ERROR_IS_SET (&error);
646  _dbus_verbose ("%s: Could not get a cookie ID to send to client: %s\n",
647  DBUS_AUTH_NAME (auth), error.message);
648  if (send_rejected (auth))
649  retval = TRUE;
650  dbus_error_free (&error);
651  goto out;
652  }
653  else
654  {
655  _dbus_assert (!dbus_error_is_set (&error));
656  }
657 
658  if (!_dbus_string_copy (&auth->context, 0,
659  &tmp2, _dbus_string_get_length (&tmp2)))
660  goto out;
661 
662  if (!_dbus_string_append (&tmp2, " "))
663  goto out;
664 
665  if (!_dbus_string_append_int (&tmp2, auth->cookie_id))
666  goto out;
667 
668  if (!_dbus_string_append (&tmp2, " "))
669  goto out;
670 
671  if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES, &error))
672  {
674  {
675  dbus_error_free (&error);
676  goto out;
677  }
678  else
679  {
680  _DBUS_ASSERT_ERROR_IS_SET (&error);
681  _dbus_verbose ("%s: Error generating challenge: %s\n",
682  DBUS_AUTH_NAME (auth), error.message);
683  if (send_rejected (auth))
684  retval = TRUE; /* retval is only about mem */
685 
686  dbus_error_free (&error);
687  goto out;
688  }
689  }
690 
692  if (!_dbus_string_hex_encode (&tmp, 0, &auth->challenge, 0))
693  goto out;
694 
695  if (!_dbus_string_hex_encode (&tmp, 0, &tmp2,
696  _dbus_string_get_length (&tmp2)))
697  goto out;
698 
699  if (!send_data (auth, &tmp2))
700  goto out;
701 
702  goto_state (auth, &server_state_waiting_for_data);
703  retval = TRUE;
704 
705  out:
706  _dbus_string_zero (&tmp);
707  _dbus_string_free (&tmp);
708  _dbus_string_zero (&tmp2);
709  _dbus_string_free (&tmp2);
710 
711  if (myself != NULL)
712  _dbus_credentials_unref (myself);
713 
714  return retval;
715 }
716 
717 static dbus_bool_t
718 sha1_handle_second_client_response (DBusAuth *auth,
719  const DBusString *data)
720 {
721  /* We are expecting a response which is the hex-encoded client
722  * challenge, space, then SHA-1 hash of the concatenation of our
723  * challenge, ":", client challenge, ":", secret key, all
724  * hex-encoded.
725  */
726  int i;
727  DBusString client_challenge;
728  DBusString client_hash;
729  dbus_bool_t retval;
730  DBusString correct_hash;
731 
732  retval = FALSE;
733 
734  if (!_dbus_string_find_blank (data, 0, &i))
735  {
736  _dbus_verbose ("%s: no space separator in client response\n",
737  DBUS_AUTH_NAME (auth));
738  return send_rejected (auth);
739  }
740 
741  if (!_dbus_string_init (&client_challenge))
742  goto out_0;
743 
744  if (!_dbus_string_init (&client_hash))
745  goto out_1;
746 
747  if (!_dbus_string_copy_len (data, 0, i, &client_challenge,
748  0))
749  goto out_2;
750 
751  _dbus_string_skip_blank (data, i, &i);
752 
753  if (!_dbus_string_copy_len (data, i,
754  _dbus_string_get_length (data) - i,
755  &client_hash,
756  0))
757  goto out_2;
758 
759  if (_dbus_string_get_length (&client_challenge) == 0 ||
760  _dbus_string_get_length (&client_hash) == 0)
761  {
762  _dbus_verbose ("%s: zero-length client challenge or hash\n",
763  DBUS_AUTH_NAME (auth));
764  if (send_rejected (auth))
765  retval = TRUE;
766  goto out_2;
767  }
768 
769  if (!_dbus_string_init (&correct_hash))
770  goto out_2;
771 
772  if (!sha1_compute_hash (auth, auth->cookie_id,
773  &auth->challenge,
774  &client_challenge,
775  &correct_hash))
776  goto out_3;
777 
778  /* if cookie_id was invalid, then we get an empty hash */
779  if (_dbus_string_get_length (&correct_hash) == 0)
780  {
781  if (send_rejected (auth))
782  retval = TRUE;
783  goto out_3;
784  }
785 
786  if (!_dbus_string_equal (&client_hash, &correct_hash))
787  {
788  if (send_rejected (auth))
789  retval = TRUE;
790  goto out_3;
791  }
792 
794  auth->desired_identity))
795  goto out_3;
796 
797  /* Copy process ID from the socket credentials if it's there
798  */
800  DBUS_CREDENTIAL_UNIX_PROCESS_ID,
801  auth->credentials))
802  goto out_3;
803 
804  if (!send_ok (auth))
805  goto out_3;
806 
807  _dbus_verbose ("%s: authenticated client using DBUS_COOKIE_SHA1\n",
808  DBUS_AUTH_NAME (auth));
809 
810  retval = TRUE;
811 
812  out_3:
813  _dbus_string_zero (&correct_hash);
814  _dbus_string_free (&correct_hash);
815  out_2:
816  _dbus_string_zero (&client_hash);
817  _dbus_string_free (&client_hash);
818  out_1:
819  _dbus_string_free (&client_challenge);
820  out_0:
821  return retval;
822 }
823 
824 static dbus_bool_t
825 handle_server_data_cookie_sha1_mech (DBusAuth *auth,
826  const DBusString *data)
827 {
828  if (auth->cookie_id < 0)
829  return sha1_handle_first_client_response (auth, data);
830  else
831  return sha1_handle_second_client_response (auth, data);
832 }
833 
834 static void
835 handle_server_shutdown_cookie_sha1_mech (DBusAuth *auth)
836 {
837  auth->cookie_id = -1;
839 }
840 
841 static dbus_bool_t
842 handle_client_initial_response_cookie_sha1_mech (DBusAuth *auth,
843  DBusString *response)
844 {
845  DBusString username;
846  dbus_bool_t retval;
847 
848  retval = FALSE;
849 
850  if (!_dbus_string_init (&username))
851  return FALSE;
852 
854  goto out_0;
855 
856  if (!_dbus_string_hex_encode (&username, 0,
857  response,
858  _dbus_string_get_length (response)))
859  goto out_0;
860 
861  retval = TRUE;
862 
863  out_0:
864  _dbus_string_free (&username);
865 
866  return retval;
867 }
868 
869 static dbus_bool_t
870 handle_client_data_cookie_sha1_mech (DBusAuth *auth,
871  const DBusString *data)
872 {
873  /* The data we get from the server should be the cookie context
874  * name, the cookie ID, and the server challenge, separated by
875  * spaces. We send back our challenge string and the correct hash.
876  */
877  dbus_bool_t retval = FALSE;
879  DBusString cookie_id_str;
880  DBusString server_challenge;
881  DBusString client_challenge;
882  DBusString correct_hash;
883  DBusString tmp;
884  int i, j;
885  long val;
886  DBusError error = DBUS_ERROR_INIT;
887 
888  if (!_dbus_string_find_blank (data, 0, &i))
889  {
890  if (send_error (auth,
891  "Server did not send context/ID/challenge properly"))
892  retval = TRUE;
893  goto out_0;
894  }
895 
896  if (!_dbus_string_init (&context))
897  goto out_0;
898 
899  if (!_dbus_string_copy_len (data, 0, i,
900  &context, 0))
901  goto out_1;
902 
903  _dbus_string_skip_blank (data, i, &i);
904  if (!_dbus_string_find_blank (data, i, &j))
905  {
906  if (send_error (auth,
907  "Server did not send context/ID/challenge properly"))
908  retval = TRUE;
909  goto out_1;
910  }
911 
912  if (!_dbus_string_init (&cookie_id_str))
913  goto out_1;
914 
915  if (!_dbus_string_copy_len (data, i, j - i,
916  &cookie_id_str, 0))
917  goto out_2;
918 
919  if (!_dbus_string_init (&server_challenge))
920  goto out_2;
921 
922  i = j;
923  _dbus_string_skip_blank (data, i, &i);
924  j = _dbus_string_get_length (data);
925 
926  if (!_dbus_string_copy_len (data, i, j - i,
927  &server_challenge, 0))
928  goto out_3;
929 
930  if (!_dbus_keyring_validate_context (&context))
931  {
932  if (send_error (auth, "Server sent invalid cookie context"))
933  retval = TRUE;
934  goto out_3;
935  }
936 
937  if (!_dbus_string_parse_int (&cookie_id_str, 0, &val, NULL))
938  {
939  if (send_error (auth, "Could not parse cookie ID as an integer"))
940  retval = TRUE;
941  goto out_3;
942  }
943 
944  if (_dbus_string_get_length (&server_challenge) == 0)
945  {
946  if (send_error (auth, "Empty server challenge string"))
947  retval = TRUE;
948  goto out_3;
949  }
950 
951  if (auth->keyring == NULL)
952  {
954  &context,
955  &error);
956 
957  if (auth->keyring == NULL)
958  {
959  if (dbus_error_has_name (&error,
961  {
962  dbus_error_free (&error);
963  goto out_3;
964  }
965  else
966  {
967  _DBUS_ASSERT_ERROR_IS_SET (&error);
968 
969  _dbus_verbose ("%s: Error loading keyring: %s\n",
970  DBUS_AUTH_NAME (auth), error.message);
971 
972  if (send_error (auth, "Could not load cookie file"))
973  retval = TRUE; /* retval is only about mem */
974 
975  dbus_error_free (&error);
976  goto out_3;
977  }
978  }
979  else
980  {
981  _dbus_assert (!dbus_error_is_set (&error));
982  }
983  }
984 
985  _dbus_assert (auth->keyring != NULL);
986 
987  if (!_dbus_string_init (&tmp))
988  goto out_3;
989 
990  if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES, &error))
991  {
993  {
994  dbus_error_free (&error);
995  goto out_4;
996  }
997  else
998  {
999  _DBUS_ASSERT_ERROR_IS_SET (&error);
1000 
1001  _dbus_verbose ("%s: Failed to generate challenge: %s\n",
1002  DBUS_AUTH_NAME (auth), error.message);
1003 
1004  if (send_error (auth, "Failed to generate challenge"))
1005  retval = TRUE; /* retval is only about mem */
1006 
1007  dbus_error_free (&error);
1008  goto out_4;
1009  }
1010  }
1011 
1012  if (!_dbus_string_init (&client_challenge))
1013  goto out_4;
1014 
1015  if (!_dbus_string_hex_encode (&tmp, 0, &client_challenge, 0))
1016  goto out_5;
1017 
1018  if (!_dbus_string_init (&correct_hash))
1019  goto out_5;
1020 
1021  if (!sha1_compute_hash (auth, val,
1022  &server_challenge,
1023  &client_challenge,
1024  &correct_hash))
1025  goto out_6;
1026 
1027  if (_dbus_string_get_length (&correct_hash) == 0)
1028  {
1029  /* couldn't find the cookie ID or something */
1030  if (send_error (auth, "Don't have the requested cookie ID"))
1031  retval = TRUE;
1032  goto out_6;
1033  }
1034 
1035  _dbus_string_set_length (&tmp, 0);
1036 
1037  if (!_dbus_string_copy (&client_challenge, 0, &tmp,
1038  _dbus_string_get_length (&tmp)))
1039  goto out_6;
1040 
1041  if (!_dbus_string_append (&tmp, " "))
1042  goto out_6;
1043 
1044  if (!_dbus_string_copy (&correct_hash, 0, &tmp,
1045  _dbus_string_get_length (&tmp)))
1046  goto out_6;
1047 
1048  if (!send_data (auth, &tmp))
1049  goto out_6;
1050 
1051  retval = TRUE;
1052 
1053  out_6:
1054  _dbus_string_zero (&correct_hash);
1055  _dbus_string_free (&correct_hash);
1056  out_5:
1057  _dbus_string_free (&client_challenge);
1058  out_4:
1059  _dbus_string_zero (&tmp);
1060  _dbus_string_free (&tmp);
1061  out_3:
1062  _dbus_string_free (&server_challenge);
1063  out_2:
1064  _dbus_string_free (&cookie_id_str);
1065  out_1:
1066  _dbus_string_free (&context);
1067  out_0:
1068  return retval;
1069 }
1070 
1071 static void
1072 handle_client_shutdown_cookie_sha1_mech (DBusAuth *auth)
1073 {
1074  auth->cookie_id = -1;
1075  _dbus_string_set_length (&auth->challenge, 0);
1076 }
1077 
1078 /*
1079  * EXTERNAL mechanism
1080  */
1081 
1082 static dbus_bool_t
1083 handle_server_data_external_mech (DBusAuth *auth,
1084  const DBusString *data)
1085 {
1087  {
1088  _dbus_verbose ("%s: no credentials, mechanism EXTERNAL can't authenticate\n",
1089  DBUS_AUTH_NAME (auth));
1090  return send_rejected (auth);
1091  }
1092 
1093  if (_dbus_string_get_length (data) > 0)
1094  {
1095  if (_dbus_string_get_length (&auth->identity) > 0)
1096  {
1097  /* Tried to send two auth identities, wtf */
1098  _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
1099  DBUS_AUTH_NAME (auth));
1100  return send_rejected (auth);
1101  }
1102  else
1103  {
1104  /* this is our auth identity */
1105  if (!_dbus_string_copy (data, 0, &auth->identity, 0))
1106  return FALSE;
1107  }
1108  }
1109 
1110  /* Poke client for an auth identity, if none given */
1111  if (_dbus_string_get_length (&auth->identity) == 0 &&
1113  {
1114  if (send_data (auth, NULL))
1115  {
1116  _dbus_verbose ("%s: sending empty challenge asking client for auth identity\n",
1117  DBUS_AUTH_NAME (auth));
1119  goto_state (auth, &server_state_waiting_for_data);
1120  return TRUE;
1121  }
1122  else
1123  return FALSE;
1124  }
1125 
1127 
1128  /* If auth->identity is still empty here, then client
1129  * responded with an empty string after we poked it for
1130  * an initial response. This means to try to auth the
1131  * identity provided in the credentials.
1132  */
1133  if (_dbus_string_get_length (&auth->identity) == 0)
1134  {
1136  auth->credentials))
1137  {
1138  return FALSE; /* OOM */
1139  }
1140  }
1141  else
1142  {
1144  &auth->identity))
1145  {
1146  _dbus_verbose ("%s: could not get credentials from uid string\n",
1147  DBUS_AUTH_NAME (auth));
1148  return send_rejected (auth);
1149  }
1150  }
1151 
1153  {
1154  _dbus_verbose ("%s: desired user %s is no good\n",
1155  DBUS_AUTH_NAME (auth),
1156  _dbus_string_get_const_data (&auth->identity));
1157  return send_rejected (auth);
1158  }
1159 
1161  auth->desired_identity))
1162  {
1163  /* client has authenticated */
1165  auth->desired_identity))
1166  return FALSE;
1167 
1168  /* also copy misc process info from the socket credentials
1169  */
1171  DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1172  auth->credentials))
1173  return FALSE;
1174 
1176  DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID,
1177  auth->credentials))
1178  return FALSE;
1179 
1181  DBUS_CREDENTIAL_LINUX_SECURITY_LABEL,
1182  auth->credentials))
1183  return FALSE;
1184 
1185  if (!send_ok (auth))
1186  return FALSE;
1187 
1188  _dbus_verbose ("%s: authenticated client based on socket credentials\n",
1189  DBUS_AUTH_NAME (auth));
1190 
1191  return TRUE;
1192  }
1193  else
1194  {
1195  _dbus_verbose ("%s: desired identity not found in socket credentials\n",
1196  DBUS_AUTH_NAME (auth));
1197  return send_rejected (auth);
1198  }
1199 }
1200 
1201 static void
1202 handle_server_shutdown_external_mech (DBusAuth *auth)
1203 {
1204 
1205 }
1206 
1207 static dbus_bool_t
1208 handle_client_initial_response_external_mech (DBusAuth *auth,
1209  DBusString *response)
1210 {
1211  /* We always append our UID as an initial response, so the server
1212  * doesn't have to send back an empty challenge to check whether we
1213  * want to specify an identity. i.e. this avoids a round trip that
1214  * the spec for the EXTERNAL mechanism otherwise requires.
1215  */
1216  DBusString plaintext;
1217 
1218  if (!_dbus_string_init (&plaintext))
1219  return FALSE;
1220 
1221  if (!_dbus_append_user_from_current_process (&plaintext))
1222  goto failed;
1223 
1224  if (!_dbus_string_hex_encode (&plaintext, 0,
1225  response,
1226  _dbus_string_get_length (response)))
1227  goto failed;
1228 
1229  _dbus_string_free (&plaintext);
1230 
1231  return TRUE;
1232 
1233  failed:
1234  _dbus_string_free (&plaintext);
1235  return FALSE;
1236 }
1237 
1238 static dbus_bool_t
1239 handle_client_data_external_mech (DBusAuth *auth,
1240  const DBusString *data)
1241 {
1242 
1243  return TRUE;
1244 }
1245 
1246 static void
1247 handle_client_shutdown_external_mech (DBusAuth *auth)
1248 {
1249 
1250 }
1251 
1252 /*
1253  * ANONYMOUS mechanism
1254  */
1255 
1256 static dbus_bool_t
1257 handle_server_data_anonymous_mech (DBusAuth *auth,
1258  const DBusString *data)
1259 {
1260  if (_dbus_string_get_length (data) > 0)
1261  {
1262  /* Client is allowed to send "trace" data, the only defined
1263  * meaning is that if it contains '@' it is an email address,
1264  * and otherwise it is anything else, and it's supposed to be
1265  * UTF-8
1266  */
1267  if (!_dbus_string_validate_utf8 (data, 0, _dbus_string_get_length (data)))
1268  {
1269  _dbus_verbose ("%s: Received invalid UTF-8 trace data from ANONYMOUS client\n",
1270  DBUS_AUTH_NAME (auth));
1271  return send_rejected (auth);
1272  }
1273 
1274  _dbus_verbose ("%s: ANONYMOUS client sent trace string: '%s'\n",
1275  DBUS_AUTH_NAME (auth),
1276  _dbus_string_get_const_data (data));
1277  }
1278 
1279  /* We want to be anonymous (clear in case some other protocol got midway through I guess) */
1281 
1282  /* Copy process ID from the socket credentials
1283  */
1285  DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1286  auth->credentials))
1287  return FALSE;
1288 
1289  /* Anonymous is always allowed */
1290  if (!send_ok (auth))
1291  return FALSE;
1292 
1293  _dbus_verbose ("%s: authenticated client as anonymous\n",
1294  DBUS_AUTH_NAME (auth));
1295 
1296  return TRUE;
1297 }
1298 
1299 static void
1300 handle_server_shutdown_anonymous_mech (DBusAuth *auth)
1301 {
1302 
1303 }
1304 
1305 static dbus_bool_t
1306 handle_client_initial_response_anonymous_mech (DBusAuth *auth,
1307  DBusString *response)
1308 {
1309  /* Our initial response is a "trace" string which must be valid UTF-8
1310  * and must be an email address if it contains '@'.
1311  * We just send the dbus implementation info, like a user-agent or
1312  * something, because... why not. There's nothing guaranteed here
1313  * though, we could change it later.
1314  */
1315  DBusString plaintext;
1316 
1317  if (!_dbus_string_init (&plaintext))
1318  return FALSE;
1319 
1320  if (!_dbus_string_append (&plaintext,
1321  "libdbus " DBUS_VERSION_STRING))
1322  goto failed;
1323 
1324  if (!_dbus_string_hex_encode (&plaintext, 0,
1325  response,
1326  _dbus_string_get_length (response)))
1327  goto failed;
1328 
1329  _dbus_string_free (&plaintext);
1330 
1331  return TRUE;
1332 
1333  failed:
1334  _dbus_string_free (&plaintext);
1335  return FALSE;
1336 }
1337 
1338 static dbus_bool_t
1339 handle_client_data_anonymous_mech (DBusAuth *auth,
1340  const DBusString *data)
1341 {
1342 
1343  return TRUE;
1344 }
1345 
1346 static void
1347 handle_client_shutdown_anonymous_mech (DBusAuth *auth)
1348 {
1349 
1350 }
1351 
1352 /* Put mechanisms here in order of preference.
1353  * Right now we have:
1354  *
1355  * - EXTERNAL checks socket credentials (or in the future, other info from the OS)
1356  * - DBUS_COOKIE_SHA1 uses a cookie in the home directory, like xauth or ICE
1357  * - ANONYMOUS checks nothing but doesn't auth the person as a user
1358  *
1359  * We might ideally add a mechanism to chain to Cyrus SASL so we can
1360  * use its mechanisms as well.
1361  *
1362  */
1363 static const DBusAuthMechanismHandler
1364 all_mechanisms[] = {
1365  { "EXTERNAL",
1366  handle_server_data_external_mech,
1367  NULL, NULL,
1368  handle_server_shutdown_external_mech,
1369  handle_client_initial_response_external_mech,
1370  handle_client_data_external_mech,
1371  NULL, NULL,
1372  handle_client_shutdown_external_mech },
1373  { "DBUS_COOKIE_SHA1",
1374  handle_server_data_cookie_sha1_mech,
1375  NULL, NULL,
1376  handle_server_shutdown_cookie_sha1_mech,
1377  handle_client_initial_response_cookie_sha1_mech,
1378  handle_client_data_cookie_sha1_mech,
1379  NULL, NULL,
1380  handle_client_shutdown_cookie_sha1_mech },
1381  { "ANONYMOUS",
1382  handle_server_data_anonymous_mech,
1383  NULL, NULL,
1384  handle_server_shutdown_anonymous_mech,
1385  handle_client_initial_response_anonymous_mech,
1386  handle_client_data_anonymous_mech,
1387  NULL, NULL,
1388  handle_client_shutdown_anonymous_mech },
1389  { NULL, NULL }
1390 };
1391 
1392 static const DBusAuthMechanismHandler*
1393 find_mech (const DBusString *name,
1394  char **allowed_mechs)
1395 {
1396  int i;
1397 
1398  if (allowed_mechs != NULL &&
1399  !_dbus_string_array_contains ((const char**) allowed_mechs,
1400  _dbus_string_get_const_data (name)))
1401  return NULL;
1402 
1403  i = 0;
1404  while (all_mechanisms[i].mechanism != NULL)
1405  {
1406  if (_dbus_string_equal_c_str (name,
1407  all_mechanisms[i].mechanism))
1408 
1409  return &all_mechanisms[i];
1410 
1411  ++i;
1412  }
1413 
1414  return NULL;
1415 }
1416 
1417 static dbus_bool_t
1418 send_auth (DBusAuth *auth, const DBusAuthMechanismHandler *mech)
1419 {
1420  DBusString auth_command;
1421 
1422  if (!_dbus_string_init (&auth_command))
1423  return FALSE;
1424 
1425  if (!_dbus_string_append (&auth_command,
1426  "AUTH "))
1427  {
1428  _dbus_string_free (&auth_command);
1429  return FALSE;
1430  }
1431 
1432  if (!_dbus_string_append (&auth_command,
1433  mech->mechanism))
1434  {
1435  _dbus_string_free (&auth_command);
1436  return FALSE;
1437  }
1438 
1439  if (mech->client_initial_response_func != NULL)
1440  {
1441  if (!_dbus_string_append (&auth_command, " "))
1442  {
1443  _dbus_string_free (&auth_command);
1444  return FALSE;
1445  }
1446 
1447  if (!(* mech->client_initial_response_func) (auth, &auth_command))
1448  {
1449  _dbus_string_free (&auth_command);
1450  return FALSE;
1451  }
1452  }
1453 
1454  if (!_dbus_string_append (&auth_command,
1455  "\r\n"))
1456  {
1457  _dbus_string_free (&auth_command);
1458  return FALSE;
1459  }
1460 
1461  if (!_dbus_string_copy (&auth_command, 0,
1462  &auth->outgoing,
1463  _dbus_string_get_length (&auth->outgoing)))
1464  {
1465  _dbus_string_free (&auth_command);
1466  return FALSE;
1467  }
1468 
1469  _dbus_string_free (&auth_command);
1470  shutdown_mech (auth);
1471  auth->mech = mech;
1472  goto_state (auth, &client_state_waiting_for_data);
1473 
1474  return TRUE;
1475 }
1476 
1477 static dbus_bool_t
1478 send_data (DBusAuth *auth, DBusString *data)
1479 {
1480  int old_len;
1481 
1482  if (data == NULL || _dbus_string_get_length (data) == 0)
1483  return _dbus_string_append (&auth->outgoing, "DATA\r\n");
1484  else
1485  {
1486  old_len = _dbus_string_get_length (&auth->outgoing);
1487  if (!_dbus_string_append (&auth->outgoing, "DATA "))
1488  goto out;
1489 
1490  if (!_dbus_string_hex_encode (data, 0, &auth->outgoing,
1491  _dbus_string_get_length (&auth->outgoing)))
1492  goto out;
1493 
1494  if (!_dbus_string_append (&auth->outgoing, "\r\n"))
1495  goto out;
1496 
1497  return TRUE;
1498 
1499  out:
1500  _dbus_string_set_length (&auth->outgoing, old_len);
1501 
1502  return FALSE;
1503  }
1504 }
1505 
1506 static dbus_bool_t
1507 send_rejected (DBusAuth *auth)
1508 {
1509  DBusString command;
1510  DBusAuthServer *server_auth;
1511  int i;
1512 
1513  if (!_dbus_string_init (&command))
1514  return FALSE;
1515 
1516  if (!_dbus_string_append (&command,
1517  "REJECTED"))
1518  goto nomem;
1519 
1520  i = 0;
1521  while (all_mechanisms[i].mechanism != NULL)
1522  {
1523  if (!_dbus_string_append (&command,
1524  " "))
1525  goto nomem;
1526 
1527  if (!_dbus_string_append (&command,
1528  all_mechanisms[i].mechanism))
1529  goto nomem;
1530 
1531  ++i;
1532  }
1533 
1534  if (!_dbus_string_append (&command, "\r\n"))
1535  goto nomem;
1536 
1537  if (!_dbus_string_copy (&command, 0, &auth->outgoing,
1538  _dbus_string_get_length (&auth->outgoing)))
1539  goto nomem;
1540 
1541  shutdown_mech (auth);
1542 
1544  server_auth = DBUS_AUTH_SERVER (auth);
1545  server_auth->failures += 1;
1546 
1547  if (server_auth->failures >= server_auth->max_failures)
1548  goto_state (auth, &common_state_need_disconnect);
1549  else
1550  goto_state (auth, &server_state_waiting_for_auth);
1551 
1552  _dbus_string_free (&command);
1553 
1554  return TRUE;
1555 
1556  nomem:
1557  _dbus_string_free (&command);
1558  return FALSE;
1559 }
1560 
1561 static dbus_bool_t
1562 send_error (DBusAuth *auth, const char *message)
1563 {
1564  return _dbus_string_append_printf (&auth->outgoing,
1565  "ERROR \"%s\"\r\n", message);
1566 }
1567 
1568 static dbus_bool_t
1569 send_ok (DBusAuth *auth)
1570 {
1571  int orig_len;
1572 
1573  orig_len = _dbus_string_get_length (&auth->outgoing);
1574 
1575  if (_dbus_string_append (&auth->outgoing, "OK ") &&
1576  _dbus_string_copy (& DBUS_AUTH_SERVER (auth)->guid,
1577  0,
1578  &auth->outgoing,
1579  _dbus_string_get_length (&auth->outgoing)) &&
1580  _dbus_string_append (&auth->outgoing, "\r\n"))
1581  {
1582  goto_state (auth, &server_state_waiting_for_begin);
1583  return TRUE;
1584  }
1585  else
1586  {
1587  _dbus_string_set_length (&auth->outgoing, orig_len);
1588  return FALSE;
1589  }
1590 }
1591 
1592 static dbus_bool_t
1593 send_begin (DBusAuth *auth)
1594 {
1595 
1596  if (!_dbus_string_append (&auth->outgoing,
1597  "BEGIN\r\n"))
1598  return FALSE;
1599 
1600  goto_state (auth, &common_state_authenticated);
1601  return TRUE;
1602 }
1603 
1604 static dbus_bool_t
1605 process_ok(DBusAuth *auth,
1606  const DBusString *args_from_ok) {
1607 
1608  int end_of_hex;
1609 
1610  /* "args_from_ok" should be the GUID, whitespace already pulled off the front */
1611  _dbus_assert (_dbus_string_get_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server) == 0);
1612 
1613  /* We decode the hex string to binary, using guid_from_server as scratch... */
1614 
1615  end_of_hex = 0;
1616  if (!_dbus_string_hex_decode (args_from_ok, 0, &end_of_hex,
1617  & DBUS_AUTH_CLIENT (auth)->guid_from_server, 0))
1618  return FALSE;
1619 
1620  /* now clear out the scratch */
1621  _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1622 
1623  if (end_of_hex != _dbus_string_get_length (args_from_ok) ||
1624  end_of_hex == 0)
1625  {
1626  _dbus_verbose ("Bad GUID from server, parsed %d bytes and had %d bytes from server\n",
1627  end_of_hex, _dbus_string_get_length (args_from_ok));
1628  goto_state (auth, &common_state_need_disconnect);
1629  return TRUE;
1630  }
1631 
1632  if (!_dbus_string_copy (args_from_ok, 0, &DBUS_AUTH_CLIENT (auth)->guid_from_server, 0)) {
1633  _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1634  return FALSE;
1635  }
1636 
1637  _dbus_verbose ("Got GUID '%s' from the server\n",
1638  _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server));
1639 
1640  if (auth->unix_fd_possible)
1641  return send_negotiate_unix_fd(auth);
1642 
1643  _dbus_verbose("Not negotiating unix fd passing, since not possible\n");
1644  return send_begin (auth);
1645 }
1646 
1647 static dbus_bool_t
1648 send_cancel (DBusAuth *auth)
1649 {
1650  if (_dbus_string_append (&auth->outgoing, "CANCEL\r\n"))
1651  {
1652  goto_state (auth, &client_state_waiting_for_reject);
1653  return TRUE;
1654  }
1655  else
1656  return FALSE;
1657 }
1658 
1659 static dbus_bool_t
1660 process_data (DBusAuth *auth,
1661  const DBusString *args,
1662  DBusAuthDataFunction data_func)
1663 {
1664  int end;
1665  DBusString decoded;
1666 
1667  if (!_dbus_string_init (&decoded))
1668  return FALSE;
1669 
1670  if (!_dbus_string_hex_decode (args, 0, &end, &decoded, 0))
1671  {
1672  _dbus_string_free (&decoded);
1673  return FALSE;
1674  }
1675 
1676  if (_dbus_string_get_length (args) != end)
1677  {
1678  _dbus_string_free (&decoded);
1679  if (!send_error (auth, "Invalid hex encoding"))
1680  return FALSE;
1681 
1682  return TRUE;
1683  }
1684 
1685 #ifdef DBUS_ENABLE_VERBOSE_MODE
1686  if (_dbus_string_validate_ascii (&decoded, 0,
1687  _dbus_string_get_length (&decoded)))
1688  _dbus_verbose ("%s: data: '%s'\n",
1689  DBUS_AUTH_NAME (auth),
1690  _dbus_string_get_const_data (&decoded));
1691 #endif
1692 
1693  if (!(* data_func) (auth, &decoded))
1694  {
1695  _dbus_string_free (&decoded);
1696  return FALSE;
1697  }
1698 
1699  _dbus_string_free (&decoded);
1700  return TRUE;
1701 }
1702 
1703 static dbus_bool_t
1704 send_negotiate_unix_fd (DBusAuth *auth)
1705 {
1706  if (!_dbus_string_append (&auth->outgoing,
1707  "NEGOTIATE_UNIX_FD\r\n"))
1708  return FALSE;
1709 
1710  goto_state (auth, &client_state_waiting_for_agree_unix_fd);
1711  return TRUE;
1712 }
1713 
1714 static dbus_bool_t
1715 send_agree_unix_fd (DBusAuth *auth)
1716 {
1718 
1719  auth->unix_fd_negotiated = TRUE;
1720  _dbus_verbose("Agreed to UNIX FD passing\n");
1721 
1722  if (!_dbus_string_append (&auth->outgoing,
1723  "AGREE_UNIX_FD\r\n"))
1724  return FALSE;
1725 
1726  goto_state (auth, &server_state_waiting_for_begin);
1727  return TRUE;
1728 }
1729 
1730 static dbus_bool_t
1731 handle_auth (DBusAuth *auth, const DBusString *args)
1732 {
1733  if (_dbus_string_get_length (args) == 0)
1734  {
1735  /* No args to the auth, send mechanisms */
1736  if (!send_rejected (auth))
1737  return FALSE;
1738 
1739  return TRUE;
1740  }
1741  else
1742  {
1743  int i;
1744  DBusString mech;
1745  DBusString hex_response;
1746 
1747  _dbus_string_find_blank (args, 0, &i);
1748 
1749  if (!_dbus_string_init (&mech))
1750  return FALSE;
1751 
1752  if (!_dbus_string_init (&hex_response))
1753  {
1754  _dbus_string_free (&mech);
1755  return FALSE;
1756  }
1757 
1758  if (!_dbus_string_copy_len (args, 0, i, &mech, 0))
1759  goto failed;
1760 
1761  _dbus_string_skip_blank (args, i, &i);
1762  if (!_dbus_string_copy (args, i, &hex_response, 0))
1763  goto failed;
1764 
1765  auth->mech = find_mech (&mech, auth->allowed_mechs);
1766  if (auth->mech != NULL)
1767  {
1768  _dbus_verbose ("%s: Trying mechanism %s\n",
1769  DBUS_AUTH_NAME (auth),
1770  auth->mech->mechanism);
1771 
1772  if (!process_data (auth, &hex_response,
1773  auth->mech->server_data_func))
1774  goto failed;
1775  }
1776  else
1777  {
1778  /* Unsupported mechanism */
1779  _dbus_verbose ("%s: Unsupported mechanism %s\n",
1780  DBUS_AUTH_NAME (auth),
1781  _dbus_string_get_const_data (&mech));
1782 
1783  if (!send_rejected (auth))
1784  goto failed;
1785  }
1786 
1787  _dbus_string_free (&mech);
1788  _dbus_string_free (&hex_response);
1789 
1790  return TRUE;
1791 
1792  failed:
1793  auth->mech = NULL;
1794  _dbus_string_free (&mech);
1795  _dbus_string_free (&hex_response);
1796  return FALSE;
1797  }
1798 }
1799 
1800 static dbus_bool_t
1801 handle_server_state_waiting_for_auth (DBusAuth *auth,
1802  DBusAuthCommand command,
1803  const DBusString *args)
1804 {
1805  switch (command)
1806  {
1807  case DBUS_AUTH_COMMAND_AUTH:
1808  return handle_auth (auth, args);
1809 
1810  case DBUS_AUTH_COMMAND_CANCEL:
1811  case DBUS_AUTH_COMMAND_DATA:
1812  return send_error (auth, "Not currently in an auth conversation");
1813 
1814  case DBUS_AUTH_COMMAND_BEGIN:
1815  goto_state (auth, &common_state_need_disconnect);
1816  return TRUE;
1817 
1818  case DBUS_AUTH_COMMAND_ERROR:
1819  return send_rejected (auth);
1820 
1821  case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1822  return send_error (auth, "Need to authenticate first");
1823 
1824  case DBUS_AUTH_COMMAND_REJECTED:
1825  case DBUS_AUTH_COMMAND_OK:
1826  case DBUS_AUTH_COMMAND_UNKNOWN:
1827  case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1828  default:
1829  return send_error (auth, "Unknown command");
1830  }
1831 }
1832 
1833 static dbus_bool_t
1834 handle_server_state_waiting_for_data (DBusAuth *auth,
1835  DBusAuthCommand command,
1836  const DBusString *args)
1837 {
1838  switch (command)
1839  {
1840  case DBUS_AUTH_COMMAND_AUTH:
1841  return send_error (auth, "Sent AUTH while another AUTH in progress");
1842 
1843  case DBUS_AUTH_COMMAND_CANCEL:
1844  case DBUS_AUTH_COMMAND_ERROR:
1845  return send_rejected (auth);
1846 
1847  case DBUS_AUTH_COMMAND_DATA:
1848  return process_data (auth, args, auth->mech->server_data_func);
1849 
1850  case DBUS_AUTH_COMMAND_BEGIN:
1851  goto_state (auth, &common_state_need_disconnect);
1852  return TRUE;
1853 
1854  case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1855  return send_error (auth, "Need to authenticate first");
1856 
1857  case DBUS_AUTH_COMMAND_REJECTED:
1858  case DBUS_AUTH_COMMAND_OK:
1859  case DBUS_AUTH_COMMAND_UNKNOWN:
1860  case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1861  default:
1862  return send_error (auth, "Unknown command");
1863  }
1864 }
1865 
1866 static dbus_bool_t
1867 handle_server_state_waiting_for_begin (DBusAuth *auth,
1868  DBusAuthCommand command,
1869  const DBusString *args)
1870 {
1871  switch (command)
1872  {
1873  case DBUS_AUTH_COMMAND_AUTH:
1874  return send_error (auth, "Sent AUTH while expecting BEGIN");
1875 
1876  case DBUS_AUTH_COMMAND_DATA:
1877  return send_error (auth, "Sent DATA while expecting BEGIN");
1878 
1879  case DBUS_AUTH_COMMAND_BEGIN:
1880  goto_state (auth, &common_state_authenticated);
1881  return TRUE;
1882 
1883  case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1884  if (auth->unix_fd_possible)
1885  return send_agree_unix_fd(auth);
1886  else
1887  return send_error(auth, "Unix FD passing not supported, not authenticated or otherwise not possible");
1888 
1889  case DBUS_AUTH_COMMAND_REJECTED:
1890  case DBUS_AUTH_COMMAND_OK:
1891  case DBUS_AUTH_COMMAND_UNKNOWN:
1892  case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1893  default:
1894  return send_error (auth, "Unknown command");
1895 
1896  case DBUS_AUTH_COMMAND_CANCEL:
1897  case DBUS_AUTH_COMMAND_ERROR:
1898  return send_rejected (auth);
1899  }
1900 }
1901 
1902 /* return FALSE if no memory, TRUE if all OK */
1903 static dbus_bool_t
1904 get_word (const DBusString *str,
1905  int *start,
1906  DBusString *word)
1907 {
1908  int i;
1909 
1910  _dbus_string_skip_blank (str, *start, start);
1911  _dbus_string_find_blank (str, *start, &i);
1912 
1913  if (i > *start)
1914  {
1915  if (!_dbus_string_copy_len (str, *start, i - *start, word, 0))
1916  return FALSE;
1917 
1918  *start = i;
1919  }
1920 
1921  return TRUE;
1922 }
1923 
1924 static dbus_bool_t
1925 record_mechanisms (DBusAuth *auth,
1926  const DBusString *args)
1927 {
1928  int next;
1929  int len;
1930 
1931  if (auth->already_got_mechanisms)
1932  return TRUE;
1933 
1934  len = _dbus_string_get_length (args);
1935 
1936  next = 0;
1937  while (next < len)
1938  {
1939  DBusString m;
1941 
1942  if (!_dbus_string_init (&m))
1943  goto nomem;
1944 
1945  if (!get_word (args, &next, &m))
1946  {
1947  _dbus_string_free (&m);
1948  goto nomem;
1949  }
1950 
1951  mech = find_mech (&m, auth->allowed_mechs);
1952 
1953  if (mech != NULL)
1954  {
1955  /* FIXME right now we try mechanisms in the order
1956  * the server lists them; should we do them in
1957  * some more deterministic order?
1958  *
1959  * Probably in all_mechanisms order, our order of
1960  * preference. Of course when the server is us,
1961  * it lists things in that order anyhow.
1962  */
1963 
1964  if (mech != &all_mechanisms[0])
1965  {
1966  _dbus_verbose ("%s: Adding mechanism %s to list we will try\n",
1967  DBUS_AUTH_NAME (auth), mech->mechanism);
1968 
1969  if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
1970  (void*) mech))
1971  {
1972  _dbus_string_free (&m);
1973  goto nomem;
1974  }
1975  }
1976  else
1977  {
1978  _dbus_verbose ("%s: Already tried mechanism %s; not adding to list we will try\n",
1979  DBUS_AUTH_NAME (auth), mech->mechanism);
1980  }
1981  }
1982  else
1983  {
1984  _dbus_verbose ("%s: Server offered mechanism \"%s\" that we don't know how to use\n",
1985  DBUS_AUTH_NAME (auth),
1986  _dbus_string_get_const_data (&m));
1987  }
1988 
1989  _dbus_string_free (&m);
1990  }
1991 
1992  auth->already_got_mechanisms = TRUE;
1993 
1994  return TRUE;
1995 
1996  nomem:
1997  _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
1998 
1999  return FALSE;
2000 }
2001 
2002 static dbus_bool_t
2003 process_rejected (DBusAuth *auth, const DBusString *args)
2004 {
2006  DBusAuthClient *client;
2007 
2008  client = DBUS_AUTH_CLIENT (auth);
2009 
2010  if (!auth->already_got_mechanisms)
2011  {
2012  if (!record_mechanisms (auth, args))
2013  return FALSE;
2014  }
2015 
2016  if (DBUS_AUTH_CLIENT (auth)->mechs_to_try != NULL)
2017  {
2018  mech = client->mechs_to_try->data;
2019 
2020  if (!send_auth (auth, mech))
2021  return FALSE;
2022 
2024 
2025  _dbus_verbose ("%s: Trying mechanism %s\n",
2026  DBUS_AUTH_NAME (auth),
2027  mech->mechanism);
2028  }
2029  else
2030  {
2031  /* Give up */
2032  _dbus_verbose ("%s: Disconnecting because we are out of mechanisms to try using\n",
2033  DBUS_AUTH_NAME (auth));
2034  goto_state (auth, &common_state_need_disconnect);
2035  }
2036 
2037  return TRUE;
2038 }
2039 
2040 
2041 static dbus_bool_t
2042 handle_client_state_waiting_for_data (DBusAuth *auth,
2043  DBusAuthCommand command,
2044  const DBusString *args)
2045 {
2046  _dbus_assert (auth->mech != NULL);
2047 
2048  switch (command)
2049  {
2050  case DBUS_AUTH_COMMAND_DATA:
2051  return process_data (auth, args, auth->mech->client_data_func);
2052 
2053  case DBUS_AUTH_COMMAND_REJECTED:
2054  return process_rejected (auth, args);
2055 
2056  case DBUS_AUTH_COMMAND_OK:
2057  return process_ok(auth, args);
2058 
2059  case DBUS_AUTH_COMMAND_ERROR:
2060  return send_cancel (auth);
2061 
2062  case DBUS_AUTH_COMMAND_AUTH:
2063  case DBUS_AUTH_COMMAND_CANCEL:
2064  case DBUS_AUTH_COMMAND_BEGIN:
2065  case DBUS_AUTH_COMMAND_UNKNOWN:
2066  case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2067  case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2068  default:
2069  return send_error (auth, "Unknown command");
2070  }
2071 }
2072 
2073 static dbus_bool_t
2074 handle_client_state_waiting_for_ok (DBusAuth *auth,
2075  DBusAuthCommand command,
2076  const DBusString *args)
2077 {
2078  switch (command)
2079  {
2080  case DBUS_AUTH_COMMAND_REJECTED:
2081  return process_rejected (auth, args);
2082 
2083  case DBUS_AUTH_COMMAND_OK:
2084  return process_ok(auth, args);
2085 
2086  case DBUS_AUTH_COMMAND_DATA:
2087  case DBUS_AUTH_COMMAND_ERROR:
2088  return send_cancel (auth);
2089 
2090  case DBUS_AUTH_COMMAND_AUTH:
2091  case DBUS_AUTH_COMMAND_CANCEL:
2092  case DBUS_AUTH_COMMAND_BEGIN:
2093  case DBUS_AUTH_COMMAND_UNKNOWN:
2094  case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2095  case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2096  default:
2097  return send_error (auth, "Unknown command");
2098  }
2099 }
2100 
2101 static dbus_bool_t
2102 handle_client_state_waiting_for_reject (DBusAuth *auth,
2103  DBusAuthCommand command,
2104  const DBusString *args)
2105 {
2106  switch (command)
2107  {
2108  case DBUS_AUTH_COMMAND_REJECTED:
2109  return process_rejected (auth, args);
2110 
2111  case DBUS_AUTH_COMMAND_AUTH:
2112  case DBUS_AUTH_COMMAND_CANCEL:
2113  case DBUS_AUTH_COMMAND_DATA:
2114  case DBUS_AUTH_COMMAND_BEGIN:
2115  case DBUS_AUTH_COMMAND_OK:
2116  case DBUS_AUTH_COMMAND_ERROR:
2117  case DBUS_AUTH_COMMAND_UNKNOWN:
2118  case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2119  case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2120  default:
2121  goto_state (auth, &common_state_need_disconnect);
2122  return TRUE;
2123  }
2124 }
2125 
2126 static dbus_bool_t
2127 handle_client_state_waiting_for_agree_unix_fd(DBusAuth *auth,
2128  DBusAuthCommand command,
2129  const DBusString *args)
2130 {
2131  switch (command)
2132  {
2133  case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2135  auth->unix_fd_negotiated = TRUE;
2136  _dbus_verbose("Successfully negotiated UNIX FD passing\n");
2137  return send_begin (auth);
2138 
2139  case DBUS_AUTH_COMMAND_ERROR:
2141  auth->unix_fd_negotiated = FALSE;
2142  _dbus_verbose("Failed to negotiate UNIX FD passing\n");
2143  return send_begin (auth);
2144 
2145  case DBUS_AUTH_COMMAND_OK:
2146  case DBUS_AUTH_COMMAND_DATA:
2147  case DBUS_AUTH_COMMAND_REJECTED:
2148  case DBUS_AUTH_COMMAND_AUTH:
2149  case DBUS_AUTH_COMMAND_CANCEL:
2150  case DBUS_AUTH_COMMAND_BEGIN:
2151  case DBUS_AUTH_COMMAND_UNKNOWN:
2152  case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2153  default:
2154  return send_error (auth, "Unknown command");
2155  }
2156 }
2157 
2161 typedef struct {
2162  const char *name;
2165 
2166 static const DBusAuthCommandName auth_command_names[] = {
2167  { "AUTH", DBUS_AUTH_COMMAND_AUTH },
2168  { "CANCEL", DBUS_AUTH_COMMAND_CANCEL },
2169  { "DATA", DBUS_AUTH_COMMAND_DATA },
2170  { "BEGIN", DBUS_AUTH_COMMAND_BEGIN },
2171  { "REJECTED", DBUS_AUTH_COMMAND_REJECTED },
2172  { "OK", DBUS_AUTH_COMMAND_OK },
2173  { "ERROR", DBUS_AUTH_COMMAND_ERROR },
2174  { "NEGOTIATE_UNIX_FD", DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD },
2175  { "AGREE_UNIX_FD", DBUS_AUTH_COMMAND_AGREE_UNIX_FD }
2176 };
2177 
2178 static DBusAuthCommand
2179 lookup_command_from_name (DBusString *command)
2180 {
2181  int i;
2182 
2183  for (i = 0; i < _DBUS_N_ELEMENTS (auth_command_names); i++)
2184  {
2185  if (_dbus_string_equal_c_str (command,
2186  auth_command_names[i].name))
2187  return auth_command_names[i].command;
2188  }
2189 
2190  return DBUS_AUTH_COMMAND_UNKNOWN;
2191 }
2192 
2193 static void
2194 goto_state (DBusAuth *auth,
2195  const DBusAuthStateData *state)
2196 {
2197  _dbus_verbose ("%s: going from state %s to state %s\n",
2198  DBUS_AUTH_NAME (auth),
2199  auth->state->name,
2200  state->name);
2201 
2202  auth->state = state;
2203 }
2204 
2205 /* returns whether to call it again right away */
2206 static dbus_bool_t
2207 process_command (DBusAuth *auth)
2208 {
2209  DBusAuthCommand command;
2210  DBusString line;
2211  DBusString args;
2212  int eol;
2213  int i, j;
2214  dbus_bool_t retval;
2215 
2216  /* _dbus_verbose ("%s: trying process_command()\n"); */
2217 
2218  retval = FALSE;
2219 
2220  eol = 0;
2221  if (!_dbus_string_find (&auth->incoming, 0, "\r\n", &eol))
2222  return FALSE;
2223 
2224  if (!_dbus_string_init (&line))
2225  {
2226  auth->needed_memory = TRUE;
2227  return FALSE;
2228  }
2229 
2230  if (!_dbus_string_init (&args))
2231  {
2232  _dbus_string_free (&line);
2233  auth->needed_memory = TRUE;
2234  return FALSE;
2235  }
2236 
2237  if (!_dbus_string_copy_len (&auth->incoming, 0, eol, &line, 0))
2238  goto out;
2239 
2240  if (!_dbus_string_validate_ascii (&line, 0,
2241  _dbus_string_get_length (&line)))
2242  {
2243  _dbus_verbose ("%s: Command contained non-ASCII chars or embedded nul\n",
2244  DBUS_AUTH_NAME (auth));
2245  if (!send_error (auth, "Command contained non-ASCII"))
2246  goto out;
2247  else
2248  goto next_command;
2249  }
2250 
2251  _dbus_verbose ("%s: got command \"%s\"\n",
2252  DBUS_AUTH_NAME (auth),
2253  _dbus_string_get_const_data (&line));
2254 
2255  _dbus_string_find_blank (&line, 0, &i);
2256  _dbus_string_skip_blank (&line, i, &j);
2257 
2258  if (j > i)
2259  _dbus_string_delete (&line, i, j - i);
2260 
2261  if (!_dbus_string_move (&line, i, &args, 0))
2262  goto out;
2263 
2264  /* FIXME 1.0 we should probably validate that only the allowed
2265  * chars are in the command name
2266  */
2267 
2268  command = lookup_command_from_name (&line);
2269  if (!(* auth->state->handler) (auth, command, &args))
2270  goto out;
2271 
2272  next_command:
2273 
2274  /* We've succeeded in processing the whole command so drop it out
2275  * of the incoming buffer and return TRUE to try another command.
2276  */
2277 
2278  _dbus_string_delete (&auth->incoming, 0, eol);
2279 
2280  /* kill the \r\n */
2281  _dbus_string_delete (&auth->incoming, 0, 2);
2282 
2283  retval = TRUE;
2284 
2285  out:
2286  _dbus_string_free (&args);
2287  _dbus_string_free (&line);
2288 
2289  if (!retval)
2290  auth->needed_memory = TRUE;
2291  else
2292  auth->needed_memory = FALSE;
2293 
2294  return retval;
2295 }
2296 
2297 
2312 DBusAuth*
2314 {
2315  DBusAuth *auth;
2316  DBusAuthServer *server_auth;
2317  DBusString guid_copy;
2318 
2319  if (!_dbus_string_init (&guid_copy))
2320  return NULL;
2321 
2322  if (!_dbus_string_copy (guid, 0, &guid_copy, 0))
2323  {
2324  _dbus_string_free (&guid_copy);
2325  return NULL;
2326  }
2327 
2328  auth = _dbus_auth_new (sizeof (DBusAuthServer));
2329  if (auth == NULL)
2330  {
2331  _dbus_string_free (&guid_copy);
2332  return NULL;
2333  }
2334 
2335  auth->side = auth_side_server;
2336  auth->state = &server_state_waiting_for_auth;
2337 
2338  server_auth = DBUS_AUTH_SERVER (auth);
2339 
2340  server_auth->guid = guid_copy;
2341 
2342  /* perhaps this should be per-mechanism with a lower
2343  * max
2344  */
2345  server_auth->failures = 0;
2346  server_auth->max_failures = 6;
2347 
2348  return auth;
2349 }
2350 
2358 DBusAuth*
2360 {
2361  DBusAuth *auth;
2362  DBusString guid_str;
2363 
2364  if (!_dbus_string_init (&guid_str))
2365  return NULL;
2366 
2367  auth = _dbus_auth_new (sizeof (DBusAuthClient));
2368  if (auth == NULL)
2369  {
2370  _dbus_string_free (&guid_str);
2371  return NULL;
2372  }
2373 
2374  DBUS_AUTH_CLIENT (auth)->guid_from_server = guid_str;
2375 
2376  auth->side = auth_side_client;
2377  auth->state = &client_state_need_send_auth;
2378 
2379  /* Start the auth conversation by sending AUTH for our default
2380  * mechanism */
2381  if (!send_auth (auth, &all_mechanisms[0]))
2382  {
2383  _dbus_auth_unref (auth);
2384  return NULL;
2385  }
2386 
2387  return auth;
2388 }
2389 
2396 DBusAuth *
2398 {
2399  _dbus_assert (auth != NULL);
2400 
2401  auth->refcount += 1;
2402 
2403  return auth;
2404 }
2405 
2411 void
2413 {
2414  _dbus_assert (auth != NULL);
2415  _dbus_assert (auth->refcount > 0);
2416 
2417  auth->refcount -= 1;
2418  if (auth->refcount == 0)
2419  {
2420  shutdown_mech (auth);
2421 
2422  if (DBUS_AUTH_IS_CLIENT (auth))
2423  {
2424  _dbus_string_free (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2425  _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
2426  }
2427  else
2428  {
2430 
2431  _dbus_string_free (& DBUS_AUTH_SERVER (auth)->guid);
2432  }
2433 
2434  if (auth->keyring)
2435  _dbus_keyring_unref (auth->keyring);
2436 
2437  _dbus_string_free (&auth->context);
2438  _dbus_string_free (&auth->challenge);
2439  _dbus_string_free (&auth->identity);
2440  _dbus_string_free (&auth->incoming);
2441  _dbus_string_free (&auth->outgoing);
2442 
2444 
2448 
2449  dbus_free (auth);
2450  }
2451 }
2452 
2463  const char **mechanisms)
2464 {
2465  char **copy;
2466 
2467  if (mechanisms != NULL)
2468  {
2469  copy = _dbus_dup_string_array (mechanisms);
2470  if (copy == NULL)
2471  return FALSE;
2472  }
2473  else
2474  copy = NULL;
2475 
2477 
2478  auth->allowed_mechs = copy;
2479 
2480  return TRUE;
2481 }
2482 
2487 #define DBUS_AUTH_IN_END_STATE(auth) ((auth)->state->handler == NULL)
2488 
2496 DBusAuthState
2498 {
2499  auth->needed_memory = FALSE;
2500 
2501  /* Max amount we'll buffer up before deciding someone's on crack */
2502 #define MAX_BUFFER (16 * _DBUS_ONE_KILOBYTE)
2503 
2504  do
2505  {
2506  if (DBUS_AUTH_IN_END_STATE (auth))
2507  break;
2508 
2509  if (_dbus_string_get_length (&auth->incoming) > MAX_BUFFER ||
2510  _dbus_string_get_length (&auth->outgoing) > MAX_BUFFER)
2511  {
2512  goto_state (auth, &common_state_need_disconnect);
2513  _dbus_verbose ("%s: Disconnecting due to excessive data buffered in auth phase\n",
2514  DBUS_AUTH_NAME (auth));
2515  break;
2516  }
2517  }
2518  while (process_command (auth));
2519 
2520  if (auth->needed_memory)
2521  return DBUS_AUTH_STATE_WAITING_FOR_MEMORY;
2522  else if (_dbus_string_get_length (&auth->outgoing) > 0)
2523  return DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND;
2524  else if (auth->state == &common_state_need_disconnect)
2525  return DBUS_AUTH_STATE_NEED_DISCONNECT;
2526  else if (auth->state == &common_state_authenticated)
2527  return DBUS_AUTH_STATE_AUTHENTICATED;
2528  else return DBUS_AUTH_STATE_WAITING_FOR_INPUT;
2529 }
2530 
2542  const DBusString **str)
2543 {
2544  _dbus_assert (auth != NULL);
2545  _dbus_assert (str != NULL);
2546 
2547  *str = NULL;
2548 
2549  if (_dbus_string_get_length (&auth->outgoing) == 0)
2550  return FALSE;
2551 
2552  *str = &auth->outgoing;
2553 
2554  return TRUE;
2555 }
2556 
2565 void
2567  int bytes_sent)
2568 {
2569  _dbus_verbose ("%s: Sent %d bytes of: %s\n",
2570  DBUS_AUTH_NAME (auth),
2571  bytes_sent,
2572  _dbus_string_get_const_data (&auth->outgoing));
2573 
2574  _dbus_string_delete (&auth->outgoing,
2575  0, bytes_sent);
2576 }
2577 
2585 void
2587  DBusString **buffer)
2588 {
2589  _dbus_assert (auth != NULL);
2591 
2592  *buffer = &auth->incoming;
2593 
2594  auth->buffer_outstanding = TRUE;
2595 }
2596 
2603 void
2605  DBusString *buffer)
2606 {
2607  _dbus_assert (buffer == &auth->incoming);
2609 
2610  auth->buffer_outstanding = FALSE;
2611 }
2612 
2622 void
2624  const DBusString **str)
2625 {
2626  if (!DBUS_AUTH_IN_END_STATE (auth))
2627  return;
2628 
2629  *str = &auth->incoming;
2630 }
2631 
2632 
2639 void
2641 {
2642  if (!DBUS_AUTH_IN_END_STATE (auth))
2643  return;
2644 
2645  _dbus_string_set_length (&auth->incoming, 0);
2646 }
2647 
2658 {
2659  if (auth->state != &common_state_authenticated)
2660  return FALSE;
2661 
2662  if (auth->mech != NULL)
2663  {
2664  if (DBUS_AUTH_IS_CLIENT (auth))
2665  return auth->mech->client_encode_func != NULL;
2666  else
2667  return auth->mech->server_encode_func != NULL;
2668  }
2669  else
2670  return FALSE;
2671 }
2672 
2685  const DBusString *plaintext,
2686  DBusString *encoded)
2687 {
2688  _dbus_assert (plaintext != encoded);
2689 
2690  if (auth->state != &common_state_authenticated)
2691  return FALSE;
2692 
2693  if (_dbus_auth_needs_encoding (auth))
2694  {
2695  if (DBUS_AUTH_IS_CLIENT (auth))
2696  return (* auth->mech->client_encode_func) (auth, plaintext, encoded);
2697  else
2698  return (* auth->mech->server_encode_func) (auth, plaintext, encoded);
2699  }
2700  else
2701  {
2702  return _dbus_string_copy (plaintext, 0, encoded,
2703  _dbus_string_get_length (encoded));
2704  }
2705 }
2706 
2717 {
2718  if (auth->state != &common_state_authenticated)
2719  return FALSE;
2720 
2721  if (auth->mech != NULL)
2722  {
2723  if (DBUS_AUTH_IS_CLIENT (auth))
2724  return auth->mech->client_decode_func != NULL;
2725  else
2726  return auth->mech->server_decode_func != NULL;
2727  }
2728  else
2729  return FALSE;
2730 }
2731 
2732 
2748  const DBusString *encoded,
2749  DBusString *plaintext)
2750 {
2751  _dbus_assert (plaintext != encoded);
2752 
2753  if (auth->state != &common_state_authenticated)
2754  return FALSE;
2755 
2756  if (_dbus_auth_needs_decoding (auth))
2757  {
2758  if (DBUS_AUTH_IS_CLIENT (auth))
2759  return (* auth->mech->client_decode_func) (auth, encoded, plaintext);
2760  else
2761  return (* auth->mech->server_decode_func) (auth, encoded, plaintext);
2762  }
2763  else
2764  {
2765  return _dbus_string_copy (encoded, 0, plaintext,
2766  _dbus_string_get_length (plaintext));
2767  }
2768 }
2769 
2781 {
2784  credentials);
2785 }
2786 
2798 {
2799  if (auth->state == &common_state_authenticated)
2800  {
2801  return auth->authorized_identity;
2802  }
2803  else
2804  {
2805  /* FIXME instead of this, keep an empty credential around that
2806  * doesn't require allocation or something
2807  */
2808  /* return empty credentials */
2810  return auth->authorized_identity;
2811  }
2812 }
2813 
2820 const char*
2822 {
2824 
2825  if (auth->state == &common_state_authenticated)
2826  return _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2827  else
2828  return NULL;
2829 }
2830 
2841  const DBusString *context)
2842 {
2843  return _dbus_string_replace_len (context, 0, _dbus_string_get_length (context),
2844  &auth->context, 0, _dbus_string_get_length (context));
2845 }
2846 
2854 void
2856 {
2857  auth->unix_fd_possible = b;
2858 }
2859 
2868 {
2869  return auth->unix_fd_negotiated;
2870 }
2871 
2874 /* tests in dbus-auth-util.c */
dbus_bool_t dbus_error_has_name(const DBusError *error, const char *name)
Checks whether the error is set and has the given name.
Definition: dbus-errors.c:302
dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString.
Definition: dbus-string.c:935
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_parse_int(const DBusString *str, int start, long *value_return, int *end_return)
Parses an integer contained in a DBusString.
Definition: dbus-sysdeps.c:435
const char * message
public error message field
Definition: dbus-errors.h:51
void _dbus_auth_delete_unused_bytes(DBusAuth *auth)
Gets rid of unused bytes returned by _dbus_auth_get_unused_bytes() after we&#39;ve gotten them and succes...
Definition: dbus-auth.c:2640
#define NULL
A null pointer, defined appropriately for C or C++.
void _dbus_auth_get_unused_bytes(DBusAuth *auth, const DBusString **str)
Returns leftover bytes that were not used as part of the auth conversation.
Definition: dbus-auth.c:2623
void _dbus_keyring_unref(DBusKeyring *keyring)
Decrements refcount and finalizes if it reaches zero.
Definition: dbus-keyring.c:677
dbus_bool_t _dbus_string_equal(const DBusString *a, const DBusString *b)
Tests two DBusString for equality.
Definition: dbus-string.c:2013
DBusAuthDecodeFunction client_decode_func
Function on client side for decode.
Definition: dbus-auth.c:112
DBusAuthEncodeFunction server_encode_func
Function on server side to encode.
Definition: dbus-auth.c:106
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:701
dbus_bool_t _dbus_credentials_add_credential(DBusCredentials *credentials, DBusCredentialType which, DBusCredentials *other_credentials)
Merge the given credential found in the second object into the first object, overwriting the first ob...
DBusAuthCommand
Enumeration for the known authentication commands.
Definition: dbus-auth.c:119
dbus_bool_t _dbus_auth_needs_decoding(DBusAuth *auth)
Called post-authentication, indicates whether we need to decode the message stream with _dbus_auth_de...
Definition: dbus-auth.c:2716
dbus_bool_t _dbus_string_hex_encode(const DBusString *source, int start, DBusString *dest, int insert_at)
Encodes a string in hex, the way MD5 and SHA-1 are usually encoded.
Definition: dbus-string.c:2259
unsigned int buffer_outstanding
Buffer is "checked out" for reading data into.
Definition: dbus-auth.c:190
DBusList * mechs_to_try
Mechanisms we got from the server that we&#39;re going to try using.
Definition: dbus-auth.c:203
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_append_int(DBusString *str, long value)
Appends an integer to a DBusString.
Definition: dbus-sysdeps.c:354
dbus_bool_t _dbus_credentials_are_superset(DBusCredentials *credentials, DBusCredentials *possible_subset)
Checks whether the first credentials object contains all the credentials found in the second credenti...
dbus_bool_t _dbus_auth_encode_data(DBusAuth *auth, const DBusString *plaintext, DBusString *encoded)
Called post-authentication, encodes a block of bytes for sending to the peer.
Definition: dbus-auth.c:2684
Internals of DBusKeyring.
Definition: dbus-keyring.c:111
dbus_bool_t _dbus_auth_set_context(DBusAuth *auth, const DBusString *context)
Sets the "authentication context" which scopes cookies with the DBUS_COOKIE_SHA1 auth mechanism for e...
Definition: dbus-auth.c:2840
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
#define DBUS_ERROR_INIT
Expands to a suitable initializer for a DBusError on the stack.
Definition: dbus-errors.h:62
void * data
Data stored at this element.
Definition: dbus-list.h:38
void _dbus_auth_return_buffer(DBusAuth *auth, DBusString *buffer)
Returns a buffer with new data read into it.
Definition: dbus-auth.c:2604
DBusAuthState _dbus_auth_do_work(DBusAuth *auth)
Analyzes buffered input and moves the auth conversation forward, returning the new state of the auth ...
Definition: dbus-auth.c:2497
void dbus_error_free(DBusError *error)
Frees an error that&#39;s been set (or just initialized), then reinitializes the error as in dbus_error_i...
Definition: dbus-errors.c:211
const char * mechanism
Name of the mechanism.
Definition: dbus-auth.c:104
unsigned int unix_fd_negotiated
Unix fd was successfully negotiated.
Definition: dbus-auth.c:193
dbus_bool_t _dbus_keyring_get_hex_key(DBusKeyring *keyring, int key_id, DBusString *hex_key)
Gets the hex-encoded secret key for the given ID.
dbus_bool_t _dbus_auth_set_mechanisms(DBusAuth *auth, const char **mechanisms)
Sets an array of authentication mechanism names that we are willing to use.
Definition: dbus-auth.c:2462
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
DBusAuthShutdownFunction server_shutdown_func
Function on server side to shut down.
Definition: dbus-auth.c:108
dbus_bool_t _dbus_string_copy(const DBusString *source, int start, DBusString *dest, int insert_at)
Like _dbus_string_move(), but does not delete the section of the source string that&#39;s copied to the d...
Definition: dbus-string.c:1283
DBusKeyring * keyring
Keyring for cookie mechanism.
Definition: dbus-auth.c:177
DBusString context
Cookie scope.
Definition: dbus-auth.c:176
dbus_bool_t(* DBusAuthDataFunction)(DBusAuth *auth, const DBusString *data)
This function processes a block of data received from the peer.
Definition: dbus-auth.c:77
dbus_bool_t _dbus_auth_get_unix_fd_negotiated(DBusAuth *auth)
Queries whether unix fd passing was successfully negotiated.
Definition: dbus-auth.c:2867
void _dbus_credentials_clear(DBusCredentials *credentials)
Clear all credentials in the object.
dbus_bool_t _dbus_string_find(const DBusString *str, int start, const char *substr, int *found)
Finds the given substring in the string, returning TRUE and filling in the byte index where the subst...
Definition: dbus-string.c:1604
DBusString guid
Our globally unique ID in hex encoding.
Definition: dbus-auth.c:219
const char * side
Client or server.
Definition: dbus-auth.c:156
dbus_bool_t _dbus_credentials_add_credentials(DBusCredentials *credentials, DBusCredentials *other_credentials)
Merge all credentials found in the second object into the first object, overwriting the first object ...
DBusString guid_from_server
GUID received from server.
Definition: dbus-auth.c:205
DBusCredentials * _dbus_auth_get_identity(DBusAuth *auth)
Gets the identity we authorized the client as.
Definition: dbus-auth.c:2797
void _dbus_auth_get_buffer(DBusAuth *auth, DBusString **buffer)
Get a buffer to be used for reading bytes from the peer we&#39;re conversing with.
Definition: dbus-auth.c:2586
DBusString challenge
Challenge sent to client.
Definition: dbus-auth.c:179
dbus_bool_t _dbus_auth_decode_data(DBusAuth *auth, const DBusString *encoded, DBusString *plaintext)
Called post-authentication, decodes a block of bytes received from the peer.
Definition: dbus-auth.c:2747
DBusCredentials * authorized_identity
Credentials that are authorized.
Definition: dbus-auth.c:172
DBusAuthDecodeFunction server_decode_func
Function on server side to decode.
Definition: dbus-auth.c:107
dbus_bool_t _dbus_string_move(DBusString *source, int start, DBusString *dest, int insert_at)
Moves the end of one string into another string.
Definition: dbus-string.c:1259
dbus_bool_t _dbus_append_user_from_current_process(DBusString *str)
Append to the string the identity we would like to have when we authenticate, on UNIX this is the cur...
dbus_bool_t _dbus_credentials_are_anonymous(DBusCredentials *credentials)
Checks whether a credentials object contains a user identity.
dbus_bool_t _dbus_string_equal_c_str(const DBusString *a, const char *c_str)
Checks whether a string is equal to a C string.
Definition: dbus-string.c:2152
void _dbus_auth_bytes_sent(DBusAuth *auth, int bytes_sent)
Notifies the auth conversation object that the given number of bytes of the outgoing buffer have been...
Definition: dbus-auth.c:2566
Internal members of DBusAuth.
Definition: dbus-auth.c:153
DBusInitialResponseFunction client_initial_response_func
Function on client side to handle initial response.
Definition: dbus-auth.c:109
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
"Subclass" of DBusAuth for server side.
Definition: dbus-auth.c:212
DBusAuthStateFunction handler
State function for this state.
Definition: dbus-auth.c:147
DBusAuthDataFunction client_data_func
Function on client side for DATA.
Definition: dbus-auth.c:110
const DBusAuthStateData * state
Current protocol state.
Definition: dbus-auth.c:161
dbus_bool_t _dbus_string_replace_len(const DBusString *source, int start, int len, DBusString *dest, int replace_at, int replace_len)
Replaces a segment of dest string with a segment of source string.
Definition: dbus-string.c:1404
"Subclass" of DBusAuth for client side
Definition: dbus-auth.c:199
DBusCredentials * desired_identity
Identity client has requested.
Definition: dbus-auth.c:174
void _dbus_string_skip_blank(const DBusString *str, int start, int *end)
Skips blanks from start, storing the first non-blank in *end (blank is space or tab).
Definition: dbus-string.c:1803
DBusCredentials * _dbus_credentials_new_from_current_process(void)
Creates a new object with credentials (user ID and process ID) from the current process.
DBusAuth * _dbus_auth_server_new(const DBusString *guid)
Creates a new auth conversation object for the server side.
Definition: dbus-auth.c:2313
unsigned int needed_memory
We needed memory to continue since last successful getting something done.
Definition: dbus-auth.c:185
#define DBUS_AUTH_NAME(auth)
The name of the auth ("client" or "server")
Definition: dbus-auth.c:338
DBusAuth * _dbus_auth_ref(DBusAuth *auth)
Increments the refcount of an auth object.
Definition: dbus-auth.c:2397
unsigned int already_asked_for_initial_response
Already sent a blank challenge to get an initial response.
Definition: dbus-auth.c:189
void _dbus_string_delete(DBusString *str, int start, int len)
Deletes a segment of a DBusString with length len starting at start.
Definition: dbus-string.c:1193
DBusString identity
Current identity we&#39;re authorizing as.
Definition: dbus-auth.c:165
dbus_bool_t(* DBusInitialResponseFunction)(DBusAuth *auth, DBusString *response)
This function appends an initial client response to the given string.
Definition: dbus-auth.c:70
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition: dbus-list.c:270
unsigned int already_got_mechanisms
Client already got mech list.
Definition: dbus-auth.c:188
dbus_bool_t _dbus_string_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString.
Definition: dbus-string.c:1114
void _dbus_string_zero(DBusString *str)
Clears all allocated bytes in the string to zero.
Definition: dbus-string.c:2685
int cookie_id
ID of cookie to use.
Definition: dbus-auth.c:178
Information about a auth state.
Definition: dbus-auth.c:144
Object representing an exception.
Definition: dbus-errors.h:48
dbus_bool_t(* DBusAuthStateFunction)(DBusAuth *auth, DBusAuthCommand command, const DBusString *args)
Auth state function, determines the reaction to incoming events for a particular state.
Definition: dbus-auth.c:137
int _dbus_keyring_get_best_key(DBusKeyring *keyring, DBusError *error)
Gets a recent key to use for authentication.
Definition: dbus-keyring.c:945
dbus_bool_t _dbus_string_validate_utf8(const DBusString *str, int start, int len)
Checks that the given range of the string is valid UTF-8.
Definition: dbus-string.c:2555
DBusAuth base
Parent class.
Definition: dbus-auth.c:201
DBusAuthShutdownFunction client_shutdown_func
Function on client side for shutdown.
Definition: dbus-auth.c:113
void * _dbus_list_pop_first(DBusList **list)
Removes the first value in the list and returns it.
Definition: dbus-list.c:649
int refcount
reference count
Definition: dbus-auth.c:155
const char * _dbus_auth_get_guid_from_server(DBusAuth *auth)
Gets the GUID from the server if we&#39;ve authenticated; gets NULL otherwise.
Definition: dbus-auth.c:2821
#define _DBUS_N_ELEMENTS(array)
Computes the number of elements in a fixed-size array using sizeof().
char ** allowed_mechs
Mechanisms we&#39;re allowed to use, or NULL if we can use any.
Definition: dbus-auth.c:181
const char * name
Name of the command.
Definition: dbus-auth.c:2162
dbus_bool_t(* DBusAuthDecodeFunction)(DBusAuth *auth, const DBusString *data, DBusString *decoded)
This function decodes a block of data from the peer.
Definition: dbus-auth.c:90
#define DBUS_AUTH_CLIENT(auth)
Definition: dbus-auth.c:326
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
Definition: dbus-string.c:259
char ** _dbus_dup_string_array(const char **array)
Duplicates a string array.
#define TRUE
Expands to "1".
int failures
Number of times client has been rejected.
Definition: dbus-auth.c:216
#define DBUS_AUTH_IS_SERVER(auth)
Definition: dbus-auth.c:316
void(* DBusAuthShutdownFunction)(DBusAuth *auth)
This function is called when the mechanism is abandoned.
Definition: dbus-auth.c:97
#define N_CHALLENGE_BYTES
http://www.ietf.org/rfc/rfc2831.txt suggests at least 64 bits of entropy, we use 128.
Definition: dbus-auth.c:519
dbus_bool_t _dbus_string_find_blank(const DBusString *str, int start, int *found)
Finds a blank (space or tab) in the string.
Definition: dbus-string.c:1765
DBusString incoming
Incoming data buffer.
Definition: dbus-auth.c:158
dbus_bool_t _dbus_auth_set_credentials(DBusAuth *auth, DBusCredentials *credentials)
Sets credentials received via reliable means from the operating system.
Definition: dbus-auth.c:2779
dbus_bool_t _dbus_keyring_is_for_credentials(DBusKeyring *keyring, DBusCredentials *credentials)
Checks whether the keyring is for the same user as the given credentials.
Definition: dbus-keyring.c:984
void _dbus_auth_set_unix_fd_possible(DBusAuth *auth, dbus_bool_t b)
Sets whether unix fd passing is potentially on the transport and hence shall be negotiated.
Definition: dbus-auth.c:2855
const char * name
Name of the state.
Definition: dbus-auth.c:146
DBusAuthEncodeFunction client_encode_func
Function on client side for encode.
Definition: dbus-auth.c:111
DBusCredentials * _dbus_credentials_new(void)
Creates a new credentials object.
DBusKeyring * _dbus_keyring_new_for_credentials(DBusCredentials *credentials, const DBusString *context, DBusError *error)
Creates a new keyring that lives in the ~/.dbus-keyrings directory of the user represented by credent...
Definition: dbus-keyring.c:705
DBusAuthDataFunction server_data_func
Function on server side for DATA.
Definition: dbus-auth.c:105
dbus_bool_t(* DBusAuthEncodeFunction)(DBusAuth *auth, const DBusString *data, DBusString *encoded)
This function encodes a block of data from the peer.
Definition: dbus-auth.c:83
dbus_bool_t _dbus_string_hex_decode(const DBusString *source, int start, int *end_return, DBusString *dest, int insert_at)
Decodes a string from hex encoding.
Definition: dbus-string.c:2309
A node in a linked list.
Definition: dbus-list.h:34
void dbus_free_string_array(char **str_array)
Frees a NULL-terminated array of strings.
Definition: dbus-memory.c:749
dbus_bool_t _dbus_string_array_contains(const char **array, const char *str)
Checks whether a string array contains the given string.
int max_failures
Number of times we reject before disconnect.
Definition: dbus-auth.c:217
void _dbus_auth_unref(DBusAuth *auth)
Decrements the refcount of an auth object.
Definition: dbus-auth.c:2412
dbus_bool_t _dbus_generate_random_bytes(DBusString *str, int n_bytes, DBusError *error)
Generates the given number of securely random bytes, using the best mechanism we can come up with...
dbus_bool_t _dbus_auth_get_bytes_to_send(DBusAuth *auth, const DBusString **str)
Gets bytes that need to be sent to the peer we&#39;re conversing with.
Definition: dbus-auth.c:2541
Mapping from command name to enum.
Definition: dbus-auth.c:2161
Virtual table representing a particular auth mechanism.
Definition: dbus-auth.c:102
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
void _dbus_credentials_unref(DBusCredentials *credentials)
Decrement refcount on credentials.
#define FALSE
Expands to "0".
const DBusAuthMechanismHandler * mech
Current auth mechanism.
Definition: dbus-auth.c:163
#define DBUS_AUTH_SERVER(auth)
Definition: dbus-auth.c:331
unsigned int unix_fd_possible
This side could do unix fd passing.
Definition: dbus-auth.c:192
dbus_bool_t _dbus_credentials_same_user(DBusCredentials *credentials, DBusCredentials *other_credentials)
Check whether the user-identifying credentials in two credentials objects are identical.
dbus_bool_t _dbus_sha_compute(const DBusString *data, DBusString *ascii_output)
Computes the ASCII hex-encoded shasum of the given data and appends it to the output string...
Definition: dbus-sha.c:483
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition: dbus-string.c:802
dbus_bool_t _dbus_string_copy_len(const DBusString *source, int start, int len, DBusString *dest, int insert_at)
Like _dbus_string_copy(), but can copy a segment from the middle of the source string.
Definition: dbus-string.c:1375
void * dbus_malloc0(size_t bytes)
Allocates the given number of bytes, as with standard malloc(), but all bytes are initialized to zero...
Definition: dbus-memory.c:531
dbus_bool_t _dbus_auth_needs_encoding(DBusAuth *auth)
Called post-authentication, indicates whether we need to encode the message stream with _dbus_auth_en...
Definition: dbus-auth.c:2657
DBusCredentials * credentials
Credentials read from socket.
Definition: dbus-auth.c:169
DBusAuth * _dbus_auth_client_new(void)
Creates a new auth conversation object for the client side.
Definition: dbus-auth.c:2359
dbus_bool_t _dbus_string_validate_ascii(const DBusString *str, int start, int len)
Checks that the given range of the string is valid ASCII with no nul bytes.
Definition: dbus-string.c:2450
DBusAuth base
Parent class.
Definition: dbus-auth.c:214
dbus_bool_t _dbus_keyring_validate_context(const DBusString *context)
Checks whether the context is a valid context.
Definition: dbus-keyring.c:849
#define DBUS_AUTH_IN_END_STATE(auth)
Definition: dbus-auth.c:2487
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).
Definition: dbus-errors.c:329
DBusString outgoing
Outgoing data buffer.
Definition: dbus-auth.c:159
dbus_bool_t _dbus_credentials_are_empty(DBusCredentials *credentials)
Checks whether a credentials object contains anything.
#define DBUS_AUTH_IS_CLIENT(auth)
Definition: dbus-auth.c:321
DBusAuthCommand command
Corresponding enum.
Definition: dbus-auth.c:2163
void _dbus_list_clear(DBusList **list)
Frees all links in the list and sets the list head to NULL.
Definition: dbus-list.c:542
dbus_bool_t _dbus_credentials_add_from_user(DBusCredentials *credentials, const DBusString *username)
Adds the credentials corresponding to the given username.