1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-auth.c Authentication
4 * Copyright (C) 2002, 2003, 2004 Red Hat Inc.
6 * Licensed under the Academic Free License version 2.1
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.
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.
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
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"
31 #include "dbus-protocol.h"
32 #include "dbus-credentials.h"
35 * @defgroup DBusAuth Authentication
36 * @ingroup DBusInternals
37 * @brief DBusAuth object
39 * DBusAuth manages the authentication negotiation when a connection
40 * is first established, and also manages any encryption used over a
43 * @todo some SASL profiles require sending the empty string as a
44 * challenge/response, but we don't currently allow that in our
47 * @todo right now sometimes both ends will block waiting for input
48 * from the other end, e.g. if there's an error during
51 * @todo the cookie keyring needs to be cached globally not just
52 * per-auth (which raises threadsafety issues too)
54 * @todo grep FIXME in dbus-auth.c
58 * @defgroup DBusAuthInternals Authentication implementation details
59 * @ingroup DBusInternals
60 * @brief DBusAuth implementation details
62 * Private details of authentication code.
68 * This function appends an initial client response to the given string
70 typedef dbus_bool_t (* DBusInitialResponseFunction) (DBusAuth *auth,
71 DBusString *response);
74 * This function processes a block of data received from the peer.
75 * i.e. handles a DATA command.
77 typedef dbus_bool_t (* DBusAuthDataFunction) (DBusAuth *auth,
78 const DBusString *data);
81 * This function encodes a block of data from the peer.
83 typedef dbus_bool_t (* DBusAuthEncodeFunction) (DBusAuth *auth,
84 const DBusString *data,
88 * This function decodes a block of data from the peer.
90 typedef dbus_bool_t (* DBusAuthDecodeFunction) (DBusAuth *auth,
91 const DBusString *data,
95 * This function is called when the mechanism is abandoned.
97 typedef void (* DBusAuthShutdownFunction) (DBusAuth *auth);
100 * Virtual table representing a particular auth mechanism.
104 const char *mechanism; /**< Name of the mechanism */
105 DBusAuthDataFunction server_data_func; /**< Function on server side for DATA */
106 DBusAuthEncodeFunction server_encode_func; /**< Function on server side to encode */
107 DBusAuthDecodeFunction server_decode_func; /**< Function on server side to decode */
108 DBusAuthShutdownFunction server_shutdown_func; /**< Function on server side to shut down */
109 DBusInitialResponseFunction client_initial_response_func; /**< Function on client side to handle initial response */
110 DBusAuthDataFunction client_data_func; /**< Function on client side for DATA */
111 DBusAuthEncodeFunction client_encode_func; /**< Function on client side for encode */
112 DBusAuthDecodeFunction client_decode_func; /**< Function on client side for decode */
113 DBusAuthShutdownFunction client_shutdown_func; /**< Function on client side for shutdown */
114 } DBusAuthMechanismHandler;
117 * Enumeration for the known authentication commands.
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
133 * Auth state function, determines the reaction to incoming events for
134 * a particular state. Returns whether we had enough memory to
135 * complete the operation.
137 typedef dbus_bool_t (* DBusAuthStateFunction) (DBusAuth *auth,
138 DBusAuthCommand command,
139 const DBusString *args);
142 * Information about a auth state.
146 const char *name; /**< Name of the state */
147 DBusAuthStateFunction handler; /**< State function for this state */
151 * Internal members of DBusAuth.
155 int refcount; /**< reference count */
156 const char *side; /**< Client or server */
158 DBusString incoming; /**< Incoming data buffer */
159 DBusString outgoing; /**< Outgoing data buffer */
161 const DBusAuthStateData *state; /**< Current protocol state */
163 const DBusAuthMechanismHandler *mech; /**< Current auth mechanism */
165 DBusString identity; /**< Current identity we're authorizing
169 DBusCredentials *credentials; /**< Credentials read from socket
172 DBusCredentials *authorized_identity; /**< Credentials that are authorized */
174 DBusCredentials *desired_identity; /**< Identity client has requested */
176 DBusString context; /**< Cookie scope */
177 DBusKeyring *keyring; /**< Keyring for cookie mechanism. */
178 int cookie_id; /**< ID of cookie to use */
179 DBusString challenge; /**< Challenge sent to client */
181 char **allowed_mechs; /**< Mechanisms we're allowed to use,
182 * or #NULL if we can use any
185 unsigned int needed_memory : 1; /**< We needed memory to continue since last
186 * successful getting something done
188 unsigned int already_got_mechanisms : 1; /**< Client already got mech list */
189 unsigned int already_asked_for_initial_response : 1; /**< Already sent a blank challenge to get an initial response */
190 unsigned int buffer_outstanding : 1; /**< Buffer is "checked out" for reading data into */
192 unsigned int unix_fd_possible : 1; /**< This side could do unix fd passing */
193 unsigned int unix_fd_negotiated : 1; /**< Unix fd was successfully negotiated */
197 * "Subclass" of DBusAuth for client side
201 DBusAuth base; /**< Parent class */
203 DBusList *mechs_to_try; /**< Mechanisms we got from the server that we're going to try using */
205 DBusString guid_from_server; /**< GUID received from server */
210 * "Subclass" of DBusAuth for server side.
214 DBusAuth base; /**< Parent class */
216 int failures; /**< Number of times client has been rejected */
217 int max_failures; /**< Number of times we reject before disconnect */
219 DBusString guid; /**< Our globally unique ID in hex encoding */
223 static void goto_state (DBusAuth *auth,
224 const DBusAuthStateData *new_state);
225 static dbus_bool_t send_auth (DBusAuth *auth,
226 const DBusAuthMechanismHandler *mech);
227 static dbus_bool_t send_data (DBusAuth *auth,
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);
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);
252 static const DBusAuthStateData server_state_waiting_for_auth = {
253 "WaitingForAuth", handle_server_state_waiting_for_auth
255 static const DBusAuthStateData server_state_waiting_for_data = {
256 "WaitingForData", handle_server_state_waiting_for_data
258 static const DBusAuthStateData server_state_waiting_for_begin = {
259 "WaitingForBegin", handle_server_state_waiting_for_begin
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);
279 static const DBusAuthStateData client_state_need_send_auth = {
282 static const DBusAuthStateData client_state_waiting_for_data = {
283 "WaitingForData", handle_client_state_waiting_for_data
285 static const DBusAuthStateData client_state_waiting_for_ok = {
286 "WaitingForOK", handle_client_state_waiting_for_ok
288 static const DBusAuthStateData client_state_waiting_for_reject = {
289 "WaitingForReject", handle_client_state_waiting_for_reject
291 static const DBusAuthStateData client_state_waiting_for_agree_unix_fd = {
292 "WaitingForAgreeUnixFD", handle_client_state_waiting_for_agree_unix_fd
296 * Common terminal states. Terminal states have handler == NULL.
299 static const DBusAuthStateData common_state_authenticated = {
300 "Authenticated", NULL
303 static const DBusAuthStateData common_state_need_disconnect = {
304 "NeedDisconnect", NULL
307 static const char auth_side_client[] = "client";
308 static const char auth_side_server[] = "server";
310 * @param auth the auth conversation
311 * @returns #TRUE if the conversation is the server side
313 #define DBUS_AUTH_IS_SERVER(auth) ((auth)->side == auth_side_server)
315 * @param auth the auth conversation
316 * @returns #TRUE if the conversation is the client side
318 #define DBUS_AUTH_IS_CLIENT(auth) ((auth)->side == auth_side_client)
320 * @param auth the auth conversation
321 * @returns auth cast to DBusAuthClient
323 #define DBUS_AUTH_CLIENT(auth) ((DBusAuthClient*)(auth))
325 * @param auth the auth conversation
326 * @returns auth cast to DBusAuthServer
328 #define DBUS_AUTH_SERVER(auth) ((DBusAuthServer*)(auth))
331 * The name of the auth ("client" or "server")
332 * @param auth the auth conversation
335 #define DBUS_AUTH_NAME(auth) ((auth)->side)
338 _dbus_auth_new (int size)
342 auth = dbus_malloc0 (size);
348 auth->keyring = NULL;
349 auth->cookie_id = -1;
351 /* note that we don't use the max string length feature,
352 * because you can't use that feature if you're going to
353 * try to recover from out-of-memory (it creates
354 * what looks like unrecoverable inability to alloc
355 * more space in the string). But we do handle
356 * overlong buffers in _dbus_auth_do_work().
359 if (!_dbus_string_init (&auth->incoming))
362 if (!_dbus_string_init (&auth->outgoing))
365 if (!_dbus_string_init (&auth->identity))
368 if (!_dbus_string_init (&auth->context))
371 if (!_dbus_string_init (&auth->challenge))
374 /* default context if none is specified */
375 if (!_dbus_string_append (&auth->context, "org_freedesktop_general"))
378 auth->credentials = _dbus_credentials_new ();
379 if (auth->credentials == NULL)
382 auth->authorized_identity = _dbus_credentials_new ();
383 if (auth->authorized_identity == NULL)
386 auth->desired_identity = _dbus_credentials_new ();
387 if (auth->desired_identity == NULL)
394 _dbus_credentials_unref (auth->desired_identity);
397 _dbus_credentials_unref (auth->authorized_identity);
399 _dbus_credentials_unref (auth->credentials);
401 /* last alloc was an append to context, which is freed already below */ ;
403 _dbus_string_free (&auth->challenge);
405 _dbus_string_free (&auth->context);
407 _dbus_string_free (&auth->identity);
409 _dbus_string_free (&auth->outgoing);
411 _dbus_string_free (&auth->incoming);
418 shutdown_mech (DBusAuth *auth)
420 /* Cancel any auth */
421 auth->already_asked_for_initial_response = FALSE;
422 _dbus_string_set_length (&auth->identity, 0);
424 _dbus_credentials_clear (auth->authorized_identity);
425 _dbus_credentials_clear (auth->desired_identity);
427 if (auth->mech != NULL)
429 _dbus_verbose ("%s: Shutting down mechanism %s\n",
430 DBUS_AUTH_NAME (auth), auth->mech->mechanism);
432 if (DBUS_AUTH_IS_CLIENT (auth))
433 (* auth->mech->client_shutdown_func) (auth);
435 (* auth->mech->server_shutdown_func) (auth);
442 * DBUS_COOKIE_SHA1 mechanism
445 /* Returns TRUE but with an empty string hash if the
446 * cookie_id isn't known. As with all this code
447 * TRUE just means we had enough memory.
450 sha1_compute_hash (DBusAuth *auth,
452 const DBusString *server_challenge,
453 const DBusString *client_challenge,
460 _dbus_assert (auth->keyring != NULL);
464 if (!_dbus_string_init (&cookie))
467 if (!_dbus_keyring_get_hex_key (auth->keyring, cookie_id,
471 if (_dbus_string_get_length (&cookie) == 0)
477 if (!_dbus_string_init (&to_hash))
480 if (!_dbus_string_copy (server_challenge, 0,
481 &to_hash, _dbus_string_get_length (&to_hash)))
484 if (!_dbus_string_append (&to_hash, ":"))
487 if (!_dbus_string_copy (client_challenge, 0,
488 &to_hash, _dbus_string_get_length (&to_hash)))
491 if (!_dbus_string_append (&to_hash, ":"))
494 if (!_dbus_string_copy (&cookie, 0,
495 &to_hash, _dbus_string_get_length (&to_hash)))
498 if (!_dbus_sha_compute (&to_hash, hash))
504 _dbus_string_zero (&to_hash);
505 _dbus_string_free (&to_hash);
507 _dbus_string_zero (&cookie);
508 _dbus_string_free (&cookie);
512 /** http://www.ietf.org/rfc/rfc2831.txt suggests at least 64 bits of
513 * entropy, we use 128. This is the number of bytes in the random
516 #define N_CHALLENGE_BYTES (128/8)
519 sha1_handle_first_client_response (DBusAuth *auth,
520 const DBusString *data)
522 /* We haven't sent a challenge yet, we're expecting a desired
523 * username from the client.
532 _dbus_string_set_length (&auth->challenge, 0);
534 if (_dbus_string_get_length (data) > 0)
536 if (_dbus_string_get_length (&auth->identity) > 0)
538 /* Tried to send two auth identities, wtf */
539 _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
540 DBUS_AUTH_NAME (auth));
541 return send_rejected (auth);
545 /* this is our auth identity */
546 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
551 if (!_dbus_credentials_add_from_user (auth->desired_identity, data))
553 _dbus_verbose ("%s: Did not get a valid username from client\n",
554 DBUS_AUTH_NAME (auth));
555 return send_rejected (auth);
558 if (!_dbus_string_init (&tmp))
561 if (!_dbus_string_init (&tmp2))
563 _dbus_string_free (&tmp);
567 /* we cache the keyring for speed, so here we drop it if it's the
568 * wrong one. FIXME caching the keyring here is useless since we use
569 * a different DBusAuth for every connection.
572 !_dbus_keyring_is_for_credentials (auth->keyring,
573 auth->desired_identity))
575 _dbus_keyring_unref (auth->keyring);
576 auth->keyring = NULL;
579 if (auth->keyring == NULL)
581 dbus_error_init (&error);
582 auth->keyring = _dbus_keyring_new_for_credentials (auth->desired_identity,
586 if (auth->keyring == NULL)
588 if (dbus_error_has_name (&error,
589 DBUS_ERROR_NO_MEMORY))
591 dbus_error_free (&error);
596 _DBUS_ASSERT_ERROR_IS_SET (&error);
597 _dbus_verbose ("%s: Error loading keyring: %s\n",
598 DBUS_AUTH_NAME (auth), error.message);
599 if (send_rejected (auth))
600 retval = TRUE; /* retval is only about mem */
601 dbus_error_free (&error);
607 _dbus_assert (!dbus_error_is_set (&error));
611 _dbus_assert (auth->keyring != NULL);
613 dbus_error_init (&error);
614 auth->cookie_id = _dbus_keyring_get_best_key (auth->keyring, &error);
615 if (auth->cookie_id < 0)
617 _DBUS_ASSERT_ERROR_IS_SET (&error);
618 _dbus_verbose ("%s: Could not get a cookie ID to send to client: %s\n",
619 DBUS_AUTH_NAME (auth), error.message);
620 if (send_rejected (auth))
622 dbus_error_free (&error);
627 _dbus_assert (!dbus_error_is_set (&error));
630 if (!_dbus_string_copy (&auth->context, 0,
631 &tmp2, _dbus_string_get_length (&tmp2)))
634 if (!_dbus_string_append (&tmp2, " "))
637 if (!_dbus_string_append_int (&tmp2, auth->cookie_id))
640 if (!_dbus_string_append (&tmp2, " "))
643 if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES))
646 _dbus_string_set_length (&auth->challenge, 0);
647 if (!_dbus_string_hex_encode (&tmp, 0, &auth->challenge, 0))
650 if (!_dbus_string_hex_encode (&tmp, 0, &tmp2,
651 _dbus_string_get_length (&tmp2)))
654 if (!send_data (auth, &tmp2))
657 goto_state (auth, &server_state_waiting_for_data);
661 _dbus_string_zero (&tmp);
662 _dbus_string_free (&tmp);
663 _dbus_string_zero (&tmp2);
664 _dbus_string_free (&tmp2);
670 sha1_handle_second_client_response (DBusAuth *auth,
671 const DBusString *data)
673 /* We are expecting a response which is the hex-encoded client
674 * challenge, space, then SHA-1 hash of the concatenation of our
675 * challenge, ":", client challenge, ":", secret key, all
679 DBusString client_challenge;
680 DBusString client_hash;
682 DBusString correct_hash;
686 if (!_dbus_string_find_blank (data, 0, &i))
688 _dbus_verbose ("%s: no space separator in client response\n",
689 DBUS_AUTH_NAME (auth));
690 return send_rejected (auth);
693 if (!_dbus_string_init (&client_challenge))
696 if (!_dbus_string_init (&client_hash))
699 if (!_dbus_string_copy_len (data, 0, i, &client_challenge,
703 _dbus_string_skip_blank (data, i, &i);
705 if (!_dbus_string_copy_len (data, i,
706 _dbus_string_get_length (data) - i,
711 if (_dbus_string_get_length (&client_challenge) == 0 ||
712 _dbus_string_get_length (&client_hash) == 0)
714 _dbus_verbose ("%s: zero-length client challenge or hash\n",
715 DBUS_AUTH_NAME (auth));
716 if (send_rejected (auth))
721 if (!_dbus_string_init (&correct_hash))
724 if (!sha1_compute_hash (auth, auth->cookie_id,
730 /* if cookie_id was invalid, then we get an empty hash */
731 if (_dbus_string_get_length (&correct_hash) == 0)
733 if (send_rejected (auth))
738 if (!_dbus_string_equal (&client_hash, &correct_hash))
740 if (send_rejected (auth))
745 if (!_dbus_credentials_add_credentials (auth->authorized_identity,
746 auth->desired_identity))
749 /* Copy process ID from the socket credentials if it's there
751 if (!_dbus_credentials_add_credential (auth->authorized_identity,
752 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
759 _dbus_verbose ("%s: authenticated client using DBUS_COOKIE_SHA1\n",
760 DBUS_AUTH_NAME (auth));
765 _dbus_string_zero (&correct_hash);
766 _dbus_string_free (&correct_hash);
768 _dbus_string_zero (&client_hash);
769 _dbus_string_free (&client_hash);
771 _dbus_string_free (&client_challenge);
777 handle_server_data_cookie_sha1_mech (DBusAuth *auth,
778 const DBusString *data)
780 if (auth->cookie_id < 0)
781 return sha1_handle_first_client_response (auth, data);
783 return sha1_handle_second_client_response (auth, data);
787 handle_server_shutdown_cookie_sha1_mech (DBusAuth *auth)
789 auth->cookie_id = -1;
790 _dbus_string_set_length (&auth->challenge, 0);
794 handle_client_initial_response_cookie_sha1_mech (DBusAuth *auth,
795 DBusString *response)
802 if (!_dbus_string_init (&username))
805 if (!_dbus_append_user_from_current_process (&username))
808 if (!_dbus_string_hex_encode (&username, 0,
810 _dbus_string_get_length (response)))
816 _dbus_string_free (&username);
822 handle_client_data_cookie_sha1_mech (DBusAuth *auth,
823 const DBusString *data)
825 /* The data we get from the server should be the cookie context
826 * name, the cookie ID, and the server challenge, separated by
827 * spaces. We send back our challenge string and the correct hash.
831 DBusString cookie_id_str;
832 DBusString server_challenge;
833 DBusString client_challenge;
834 DBusString correct_hash;
841 if (!_dbus_string_find_blank (data, 0, &i))
843 if (send_error (auth,
844 "Server did not send context/ID/challenge properly"))
849 if (!_dbus_string_init (&context))
852 if (!_dbus_string_copy_len (data, 0, i,
856 _dbus_string_skip_blank (data, i, &i);
857 if (!_dbus_string_find_blank (data, i, &j))
859 if (send_error (auth,
860 "Server did not send context/ID/challenge properly"))
865 if (!_dbus_string_init (&cookie_id_str))
868 if (!_dbus_string_copy_len (data, i, j - i,
872 if (!_dbus_string_init (&server_challenge))
876 _dbus_string_skip_blank (data, i, &i);
877 j = _dbus_string_get_length (data);
879 if (!_dbus_string_copy_len (data, i, j - i,
880 &server_challenge, 0))
883 if (!_dbus_keyring_validate_context (&context))
885 if (send_error (auth, "Server sent invalid cookie context"))
890 if (!_dbus_string_parse_int (&cookie_id_str, 0, &val, NULL))
892 if (send_error (auth, "Could not parse cookie ID as an integer"))
897 if (_dbus_string_get_length (&server_challenge) == 0)
899 if (send_error (auth, "Empty server challenge string"))
904 if (auth->keyring == NULL)
908 dbus_error_init (&error);
909 auth->keyring = _dbus_keyring_new_for_credentials (NULL,
913 if (auth->keyring == NULL)
915 if (dbus_error_has_name (&error,
916 DBUS_ERROR_NO_MEMORY))
918 dbus_error_free (&error);
923 _DBUS_ASSERT_ERROR_IS_SET (&error);
925 _dbus_verbose ("%s: Error loading keyring: %s\n",
926 DBUS_AUTH_NAME (auth), error.message);
928 if (send_error (auth, "Could not load cookie file"))
929 retval = TRUE; /* retval is only about mem */
931 dbus_error_free (&error);
937 _dbus_assert (!dbus_error_is_set (&error));
941 _dbus_assert (auth->keyring != NULL);
943 if (!_dbus_string_init (&tmp))
946 if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES))
949 if (!_dbus_string_init (&client_challenge))
952 if (!_dbus_string_hex_encode (&tmp, 0, &client_challenge, 0))
955 if (!_dbus_string_init (&correct_hash))
958 if (!sha1_compute_hash (auth, val,
964 if (_dbus_string_get_length (&correct_hash) == 0)
966 /* couldn't find the cookie ID or something */
967 if (send_error (auth, "Don't have the requested cookie ID"))
972 _dbus_string_set_length (&tmp, 0);
974 if (!_dbus_string_copy (&client_challenge, 0, &tmp,
975 _dbus_string_get_length (&tmp)))
978 if (!_dbus_string_append (&tmp, " "))
981 if (!_dbus_string_copy (&correct_hash, 0, &tmp,
982 _dbus_string_get_length (&tmp)))
985 if (!send_data (auth, &tmp))
991 _dbus_string_zero (&correct_hash);
992 _dbus_string_free (&correct_hash);
994 _dbus_string_free (&client_challenge);
996 _dbus_string_zero (&tmp);
997 _dbus_string_free (&tmp);
999 _dbus_string_free (&server_challenge);
1001 _dbus_string_free (&cookie_id_str);
1003 _dbus_string_free (&context);
1009 handle_client_shutdown_cookie_sha1_mech (DBusAuth *auth)
1011 auth->cookie_id = -1;
1012 _dbus_string_set_length (&auth->challenge, 0);
1016 * EXTERNAL mechanism
1020 handle_server_data_external_mech (DBusAuth *auth,
1021 const DBusString *data)
1023 if (_dbus_credentials_are_anonymous (auth->credentials))
1025 _dbus_verbose ("%s: no credentials, mechanism EXTERNAL can't authenticate\n",
1026 DBUS_AUTH_NAME (auth));
1027 return send_rejected (auth);
1030 if (_dbus_string_get_length (data) > 0)
1032 if (_dbus_string_get_length (&auth->identity) > 0)
1034 /* Tried to send two auth identities, wtf */
1035 _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
1036 DBUS_AUTH_NAME (auth));
1037 return send_rejected (auth);
1041 /* this is our auth identity */
1042 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
1047 /* Poke client for an auth identity, if none given */
1048 if (_dbus_string_get_length (&auth->identity) == 0 &&
1049 !auth->already_asked_for_initial_response)
1051 if (send_data (auth, NULL))
1053 _dbus_verbose ("%s: sending empty challenge asking client for auth identity\n",
1054 DBUS_AUTH_NAME (auth));
1055 auth->already_asked_for_initial_response = TRUE;
1056 goto_state (auth, &server_state_waiting_for_data);
1063 _dbus_credentials_clear (auth->desired_identity);
1065 /* If auth->identity is still empty here, then client
1066 * responded with an empty string after we poked it for
1067 * an initial response. This means to try to auth the
1068 * identity provided in the credentials.
1070 if (_dbus_string_get_length (&auth->identity) == 0)
1072 if (!_dbus_credentials_add_credentials (auth->desired_identity,
1075 return FALSE; /* OOM */
1080 if (!_dbus_credentials_add_from_user (auth->desired_identity,
1083 _dbus_verbose ("%s: could not get credentials from uid string\n",
1084 DBUS_AUTH_NAME (auth));
1085 return send_rejected (auth);
1089 if (_dbus_credentials_are_anonymous (auth->desired_identity))
1091 _dbus_verbose ("%s: desired user %s is no good\n",
1092 DBUS_AUTH_NAME (auth),
1093 _dbus_string_get_const_data (&auth->identity));
1094 return send_rejected (auth);
1097 if (_dbus_credentials_are_superset (auth->credentials,
1098 auth->desired_identity))
1100 /* client has authenticated */
1101 if (!_dbus_credentials_add_credentials (auth->authorized_identity,
1102 auth->desired_identity))
1105 /* also copy misc process info from the socket credentials
1107 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1108 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1112 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1113 DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID,
1117 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1118 DBUS_CREDENTIAL_LINUX_SECURITY_LABEL,
1122 if (!send_ok (auth))
1125 _dbus_verbose ("%s: authenticated client based on socket credentials\n",
1126 DBUS_AUTH_NAME (auth));
1132 _dbus_verbose ("%s: desired identity not found in socket credentials\n",
1133 DBUS_AUTH_NAME (auth));
1134 return send_rejected (auth);
1139 handle_server_shutdown_external_mech (DBusAuth *auth)
1145 handle_client_initial_response_external_mech (DBusAuth *auth,
1146 DBusString *response)
1148 /* We always append our UID as an initial response, so the server
1149 * doesn't have to send back an empty challenge to check whether we
1150 * want to specify an identity. i.e. this avoids a round trip that
1151 * the spec for the EXTERNAL mechanism otherwise requires.
1153 DBusString plaintext;
1155 if (!_dbus_string_init (&plaintext))
1158 if (!_dbus_append_user_from_current_process (&plaintext))
1161 if (!_dbus_string_hex_encode (&plaintext, 0,
1163 _dbus_string_get_length (response)))
1166 _dbus_string_free (&plaintext);
1171 _dbus_string_free (&plaintext);
1176 handle_client_data_external_mech (DBusAuth *auth,
1177 const DBusString *data)
1184 handle_client_shutdown_external_mech (DBusAuth *auth)
1190 * ANONYMOUS mechanism
1194 handle_server_data_anonymous_mech (DBusAuth *auth,
1195 const DBusString *data)
1197 if (_dbus_string_get_length (data) > 0)
1199 /* Client is allowed to send "trace" data, the only defined
1200 * meaning is that if it contains '@' it is an email address,
1201 * and otherwise it is anything else, and it's supposed to be
1204 if (!_dbus_string_validate_utf8 (data, 0, _dbus_string_get_length (data)))
1206 _dbus_verbose ("%s: Received invalid UTF-8 trace data from ANONYMOUS client\n",
1207 DBUS_AUTH_NAME (auth));
1208 return send_rejected (auth);
1211 _dbus_verbose ("%s: ANONYMOUS client sent trace string: '%s'\n",
1212 DBUS_AUTH_NAME (auth),
1213 _dbus_string_get_const_data (data));
1216 /* We want to be anonymous (clear in case some other protocol got midway through I guess) */
1217 _dbus_credentials_clear (auth->desired_identity);
1219 /* Copy process ID from the socket credentials
1221 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1222 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1226 /* Anonymous is always allowed */
1227 if (!send_ok (auth))
1230 _dbus_verbose ("%s: authenticated client as anonymous\n",
1231 DBUS_AUTH_NAME (auth));
1237 handle_server_shutdown_anonymous_mech (DBusAuth *auth)
1243 handle_client_initial_response_anonymous_mech (DBusAuth *auth,
1244 DBusString *response)
1246 /* Our initial response is a "trace" string which must be valid UTF-8
1247 * and must be an email address if it contains '@'.
1248 * We just send the dbus implementation info, like a user-agent or
1249 * something, because... why not. There's nothing guaranteed here
1250 * though, we could change it later.
1252 DBusString plaintext;
1254 if (!_dbus_string_init (&plaintext))
1257 if (!_dbus_string_append (&plaintext,
1258 "libdbus " DBUS_VERSION_STRING))
1261 if (!_dbus_string_hex_encode (&plaintext, 0,
1263 _dbus_string_get_length (response)))
1266 _dbus_string_free (&plaintext);
1271 _dbus_string_free (&plaintext);
1276 handle_client_data_anonymous_mech (DBusAuth *auth,
1277 const DBusString *data)
1284 handle_client_shutdown_anonymous_mech (DBusAuth *auth)
1289 /* Put mechanisms here in order of preference.
1290 * Right now we have:
1292 * - EXTERNAL checks socket credentials (or in the future, other info from the OS)
1293 * - DBUS_COOKIE_SHA1 uses a cookie in the home directory, like xauth or ICE
1294 * - ANONYMOUS checks nothing but doesn't auth the person as a user
1296 * We might ideally add a mechanism to chain to Cyrus SASL so we can
1297 * use its mechanisms as well.
1300 static const DBusAuthMechanismHandler
1301 all_mechanisms[] = {
1303 handle_server_data_external_mech,
1305 handle_server_shutdown_external_mech,
1306 handle_client_initial_response_external_mech,
1307 handle_client_data_external_mech,
1309 handle_client_shutdown_external_mech },
1310 { "DBUS_COOKIE_SHA1",
1311 handle_server_data_cookie_sha1_mech,
1313 handle_server_shutdown_cookie_sha1_mech,
1314 handle_client_initial_response_cookie_sha1_mech,
1315 handle_client_data_cookie_sha1_mech,
1317 handle_client_shutdown_cookie_sha1_mech },
1319 handle_server_data_anonymous_mech,
1321 handle_server_shutdown_anonymous_mech,
1322 handle_client_initial_response_anonymous_mech,
1323 handle_client_data_anonymous_mech,
1325 handle_client_shutdown_anonymous_mech },
1329 static const DBusAuthMechanismHandler*
1330 find_mech (const DBusString *name,
1331 char **allowed_mechs)
1335 if (allowed_mechs != NULL &&
1336 !_dbus_string_array_contains ((const char**) allowed_mechs,
1337 _dbus_string_get_const_data (name)))
1341 while (all_mechanisms[i].mechanism != NULL)
1343 if (_dbus_string_equal_c_str (name,
1344 all_mechanisms[i].mechanism))
1346 return &all_mechanisms[i];
1355 send_auth (DBusAuth *auth, const DBusAuthMechanismHandler *mech)
1357 DBusString auth_command;
1359 if (!_dbus_string_init (&auth_command))
1362 if (!_dbus_string_append (&auth_command,
1365 _dbus_string_free (&auth_command);
1369 if (!_dbus_string_append (&auth_command,
1372 _dbus_string_free (&auth_command);
1376 if (mech->client_initial_response_func != NULL)
1378 if (!_dbus_string_append (&auth_command, " "))
1380 _dbus_string_free (&auth_command);
1384 if (!(* mech->client_initial_response_func) (auth, &auth_command))
1386 _dbus_string_free (&auth_command);
1391 if (!_dbus_string_append (&auth_command,
1394 _dbus_string_free (&auth_command);
1398 if (!_dbus_string_copy (&auth_command, 0,
1400 _dbus_string_get_length (&auth->outgoing)))
1402 _dbus_string_free (&auth_command);
1406 _dbus_string_free (&auth_command);
1407 shutdown_mech (auth);
1409 goto_state (auth, &client_state_waiting_for_data);
1415 send_data (DBusAuth *auth, DBusString *data)
1419 if (data == NULL || _dbus_string_get_length (data) == 0)
1420 return _dbus_string_append (&auth->outgoing, "DATA\r\n");
1423 old_len = _dbus_string_get_length (&auth->outgoing);
1424 if (!_dbus_string_append (&auth->outgoing, "DATA "))
1427 if (!_dbus_string_hex_encode (data, 0, &auth->outgoing,
1428 _dbus_string_get_length (&auth->outgoing)))
1431 if (!_dbus_string_append (&auth->outgoing, "\r\n"))
1437 _dbus_string_set_length (&auth->outgoing, old_len);
1444 send_rejected (DBusAuth *auth)
1447 DBusAuthServer *server_auth;
1450 if (!_dbus_string_init (&command))
1453 if (!_dbus_string_append (&command,
1458 while (all_mechanisms[i].mechanism != NULL)
1460 if (!_dbus_string_append (&command,
1464 if (!_dbus_string_append (&command,
1465 all_mechanisms[i].mechanism))
1471 if (!_dbus_string_append (&command, "\r\n"))
1474 if (!_dbus_string_copy (&command, 0, &auth->outgoing,
1475 _dbus_string_get_length (&auth->outgoing)))
1478 shutdown_mech (auth);
1480 _dbus_assert (DBUS_AUTH_IS_SERVER (auth));
1481 server_auth = DBUS_AUTH_SERVER (auth);
1482 server_auth->failures += 1;
1484 if (server_auth->failures >= server_auth->max_failures)
1485 goto_state (auth, &common_state_need_disconnect);
1487 goto_state (auth, &server_state_waiting_for_auth);
1489 _dbus_string_free (&command);
1494 _dbus_string_free (&command);
1499 send_error (DBusAuth *auth, const char *message)
1501 return _dbus_string_append_printf (&auth->outgoing,
1502 "ERROR \"%s\"\r\n", message);
1506 send_ok (DBusAuth *auth)
1510 orig_len = _dbus_string_get_length (&auth->outgoing);
1512 if (_dbus_string_append (&auth->outgoing, "OK ") &&
1513 _dbus_string_copy (& DBUS_AUTH_SERVER (auth)->guid,
1516 _dbus_string_get_length (&auth->outgoing)) &&
1517 _dbus_string_append (&auth->outgoing, "\r\n"))
1519 goto_state (auth, &server_state_waiting_for_begin);
1524 _dbus_string_set_length (&auth->outgoing, orig_len);
1530 send_begin (DBusAuth *auth)
1533 if (!_dbus_string_append (&auth->outgoing,
1537 goto_state (auth, &common_state_authenticated);
1542 process_ok(DBusAuth *auth,
1543 const DBusString *args_from_ok) {
1547 /* "args_from_ok" should be the GUID, whitespace already pulled off the front */
1548 _dbus_assert (_dbus_string_get_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server) == 0);
1550 /* We decode the hex string to binary, using guid_from_server as scratch... */
1553 if (!_dbus_string_hex_decode (args_from_ok, 0, &end_of_hex,
1554 & DBUS_AUTH_CLIENT (auth)->guid_from_server, 0))
1557 /* now clear out the scratch */
1558 _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1560 if (end_of_hex != _dbus_string_get_length (args_from_ok) ||
1563 _dbus_verbose ("Bad GUID from server, parsed %d bytes and had %d bytes from server\n",
1564 end_of_hex, _dbus_string_get_length (args_from_ok));
1565 goto_state (auth, &common_state_need_disconnect);
1569 if (!_dbus_string_copy (args_from_ok, 0, &DBUS_AUTH_CLIENT (auth)->guid_from_server, 0)) {
1570 _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1574 _dbus_verbose ("Got GUID '%s' from the server\n",
1575 _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server));
1577 if (auth->unix_fd_possible)
1578 return send_negotiate_unix_fd(auth);
1580 _dbus_verbose("Not negotiating unix fd passing, since not possible\n");
1581 return send_begin (auth);
1585 send_cancel (DBusAuth *auth)
1587 if (_dbus_string_append (&auth->outgoing, "CANCEL\r\n"))
1589 goto_state (auth, &client_state_waiting_for_reject);
1597 process_data (DBusAuth *auth,
1598 const DBusString *args,
1599 DBusAuthDataFunction data_func)
1604 if (!_dbus_string_init (&decoded))
1607 if (!_dbus_string_hex_decode (args, 0, &end, &decoded, 0))
1609 _dbus_string_free (&decoded);
1613 if (_dbus_string_get_length (args) != end)
1615 _dbus_string_free (&decoded);
1616 if (!send_error (auth, "Invalid hex encoding"))
1622 #ifdef DBUS_ENABLE_VERBOSE_MODE
1623 if (_dbus_string_validate_ascii (&decoded, 0,
1624 _dbus_string_get_length (&decoded)))
1625 _dbus_verbose ("%s: data: '%s'\n",
1626 DBUS_AUTH_NAME (auth),
1627 _dbus_string_get_const_data (&decoded));
1630 if (!(* data_func) (auth, &decoded))
1632 _dbus_string_free (&decoded);
1636 _dbus_string_free (&decoded);
1641 send_negotiate_unix_fd (DBusAuth *auth)
1643 if (!_dbus_string_append (&auth->outgoing,
1644 "NEGOTIATE_UNIX_FD\r\n"))
1647 goto_state (auth, &client_state_waiting_for_agree_unix_fd);
1652 send_agree_unix_fd (DBusAuth *auth)
1654 _dbus_assert(auth->unix_fd_possible);
1656 auth->unix_fd_negotiated = TRUE;
1657 _dbus_verbose("Agreed to UNIX FD passing\n");
1659 if (!_dbus_string_append (&auth->outgoing,
1660 "AGREE_UNIX_FD\r\n"))
1663 goto_state (auth, &server_state_waiting_for_begin);
1668 handle_auth (DBusAuth *auth, const DBusString *args)
1670 if (_dbus_string_get_length (args) == 0)
1672 /* No args to the auth, send mechanisms */
1673 if (!send_rejected (auth))
1682 DBusString hex_response;
1684 _dbus_string_find_blank (args, 0, &i);
1686 if (!_dbus_string_init (&mech))
1689 if (!_dbus_string_init (&hex_response))
1691 _dbus_string_free (&mech);
1695 if (!_dbus_string_copy_len (args, 0, i, &mech, 0))
1698 _dbus_string_skip_blank (args, i, &i);
1699 if (!_dbus_string_copy (args, i, &hex_response, 0))
1702 auth->mech = find_mech (&mech, auth->allowed_mechs);
1703 if (auth->mech != NULL)
1705 _dbus_verbose ("%s: Trying mechanism %s\n",
1706 DBUS_AUTH_NAME (auth),
1707 auth->mech->mechanism);
1709 if (!process_data (auth, &hex_response,
1710 auth->mech->server_data_func))
1715 /* Unsupported mechanism */
1716 _dbus_verbose ("%s: Unsupported mechanism %s\n",
1717 DBUS_AUTH_NAME (auth),
1718 _dbus_string_get_const_data (&mech));
1720 if (!send_rejected (auth))
1724 _dbus_string_free (&mech);
1725 _dbus_string_free (&hex_response);
1731 _dbus_string_free (&mech);
1732 _dbus_string_free (&hex_response);
1738 handle_server_state_waiting_for_auth (DBusAuth *auth,
1739 DBusAuthCommand command,
1740 const DBusString *args)
1744 case DBUS_AUTH_COMMAND_AUTH:
1745 return handle_auth (auth, args);
1747 case DBUS_AUTH_COMMAND_CANCEL:
1748 case DBUS_AUTH_COMMAND_DATA:
1749 return send_error (auth, "Not currently in an auth conversation");
1751 case DBUS_AUTH_COMMAND_BEGIN:
1752 goto_state (auth, &common_state_need_disconnect);
1755 case DBUS_AUTH_COMMAND_ERROR:
1756 return send_rejected (auth);
1758 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1759 return send_error (auth, "Need to authenticate first");
1761 case DBUS_AUTH_COMMAND_REJECTED:
1762 case DBUS_AUTH_COMMAND_OK:
1763 case DBUS_AUTH_COMMAND_UNKNOWN:
1764 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1766 return send_error (auth, "Unknown command");
1771 handle_server_state_waiting_for_data (DBusAuth *auth,
1772 DBusAuthCommand command,
1773 const DBusString *args)
1777 case DBUS_AUTH_COMMAND_AUTH:
1778 return send_error (auth, "Sent AUTH while another AUTH in progress");
1780 case DBUS_AUTH_COMMAND_CANCEL:
1781 case DBUS_AUTH_COMMAND_ERROR:
1782 return send_rejected (auth);
1784 case DBUS_AUTH_COMMAND_DATA:
1785 return process_data (auth, args, auth->mech->server_data_func);
1787 case DBUS_AUTH_COMMAND_BEGIN:
1788 goto_state (auth, &common_state_need_disconnect);
1791 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1792 return send_error (auth, "Need to authenticate first");
1794 case DBUS_AUTH_COMMAND_REJECTED:
1795 case DBUS_AUTH_COMMAND_OK:
1796 case DBUS_AUTH_COMMAND_UNKNOWN:
1797 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1799 return send_error (auth, "Unknown command");
1804 handle_server_state_waiting_for_begin (DBusAuth *auth,
1805 DBusAuthCommand command,
1806 const DBusString *args)
1810 case DBUS_AUTH_COMMAND_AUTH:
1811 return send_error (auth, "Sent AUTH while expecting BEGIN");
1813 case DBUS_AUTH_COMMAND_DATA:
1814 return send_error (auth, "Sent DATA while expecting BEGIN");
1816 case DBUS_AUTH_COMMAND_BEGIN:
1817 goto_state (auth, &common_state_authenticated);
1820 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1821 if (auth->unix_fd_possible)
1822 return send_agree_unix_fd(auth);
1824 return send_error(auth, "Unix FD passing not supported, not authenticated or otherwise not possible");
1826 case DBUS_AUTH_COMMAND_REJECTED:
1827 case DBUS_AUTH_COMMAND_OK:
1828 case DBUS_AUTH_COMMAND_UNKNOWN:
1829 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1831 return send_error (auth, "Unknown command");
1833 case DBUS_AUTH_COMMAND_CANCEL:
1834 case DBUS_AUTH_COMMAND_ERROR:
1835 return send_rejected (auth);
1839 /* return FALSE if no memory, TRUE if all OK */
1841 get_word (const DBusString *str,
1847 _dbus_string_skip_blank (str, *start, start);
1848 _dbus_string_find_blank (str, *start, &i);
1852 if (!_dbus_string_copy_len (str, *start, i - *start, word, 0))
1862 record_mechanisms (DBusAuth *auth,
1863 const DBusString *args)
1868 if (auth->already_got_mechanisms)
1871 len = _dbus_string_get_length (args);
1877 const DBusAuthMechanismHandler *mech;
1879 if (!_dbus_string_init (&m))
1882 if (!get_word (args, &next, &m))
1884 _dbus_string_free (&m);
1888 mech = find_mech (&m, auth->allowed_mechs);
1892 /* FIXME right now we try mechanisms in the order
1893 * the server lists them; should we do them in
1894 * some more deterministic order?
1896 * Probably in all_mechanisms order, our order of
1897 * preference. Of course when the server is us,
1898 * it lists things in that order anyhow.
1901 if (mech != &all_mechanisms[0])
1903 _dbus_verbose ("%s: Adding mechanism %s to list we will try\n",
1904 DBUS_AUTH_NAME (auth), mech->mechanism);
1906 if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
1909 _dbus_string_free (&m);
1915 _dbus_verbose ("%s: Already tried mechanism %s; not adding to list we will try\n",
1916 DBUS_AUTH_NAME (auth), mech->mechanism);
1921 _dbus_verbose ("%s: Server offered mechanism \"%s\" that we don't know how to use\n",
1922 DBUS_AUTH_NAME (auth),
1923 _dbus_string_get_const_data (&m));
1926 _dbus_string_free (&m);
1929 auth->already_got_mechanisms = TRUE;
1934 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
1940 process_rejected (DBusAuth *auth, const DBusString *args)
1942 const DBusAuthMechanismHandler *mech;
1943 DBusAuthClient *client;
1945 client = DBUS_AUTH_CLIENT (auth);
1947 if (!auth->already_got_mechanisms)
1949 if (!record_mechanisms (auth, args))
1953 if (DBUS_AUTH_CLIENT (auth)->mechs_to_try != NULL)
1955 mech = client->mechs_to_try->data;
1957 if (!send_auth (auth, mech))
1960 _dbus_list_pop_first (&client->mechs_to_try);
1962 _dbus_verbose ("%s: Trying mechanism %s\n",
1963 DBUS_AUTH_NAME (auth),
1969 _dbus_verbose ("%s: Disconnecting because we are out of mechanisms to try using\n",
1970 DBUS_AUTH_NAME (auth));
1971 goto_state (auth, &common_state_need_disconnect);
1979 handle_client_state_waiting_for_data (DBusAuth *auth,
1980 DBusAuthCommand command,
1981 const DBusString *args)
1983 _dbus_assert (auth->mech != NULL);
1987 case DBUS_AUTH_COMMAND_DATA:
1988 return process_data (auth, args, auth->mech->client_data_func);
1990 case DBUS_AUTH_COMMAND_REJECTED:
1991 return process_rejected (auth, args);
1993 case DBUS_AUTH_COMMAND_OK:
1994 return process_ok(auth, args);
1996 case DBUS_AUTH_COMMAND_ERROR:
1997 return send_cancel (auth);
1999 case DBUS_AUTH_COMMAND_AUTH:
2000 case DBUS_AUTH_COMMAND_CANCEL:
2001 case DBUS_AUTH_COMMAND_BEGIN:
2002 case DBUS_AUTH_COMMAND_UNKNOWN:
2003 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2004 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2006 return send_error (auth, "Unknown command");
2011 handle_client_state_waiting_for_ok (DBusAuth *auth,
2012 DBusAuthCommand command,
2013 const DBusString *args)
2017 case DBUS_AUTH_COMMAND_REJECTED:
2018 return process_rejected (auth, args);
2020 case DBUS_AUTH_COMMAND_OK:
2021 return process_ok(auth, args);
2023 case DBUS_AUTH_COMMAND_DATA:
2024 case DBUS_AUTH_COMMAND_ERROR:
2025 return send_cancel (auth);
2027 case DBUS_AUTH_COMMAND_AUTH:
2028 case DBUS_AUTH_COMMAND_CANCEL:
2029 case DBUS_AUTH_COMMAND_BEGIN:
2030 case DBUS_AUTH_COMMAND_UNKNOWN:
2031 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2032 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2034 return send_error (auth, "Unknown command");
2039 handle_client_state_waiting_for_reject (DBusAuth *auth,
2040 DBusAuthCommand command,
2041 const DBusString *args)
2045 case DBUS_AUTH_COMMAND_REJECTED:
2046 return process_rejected (auth, args);
2048 case DBUS_AUTH_COMMAND_AUTH:
2049 case DBUS_AUTH_COMMAND_CANCEL:
2050 case DBUS_AUTH_COMMAND_DATA:
2051 case DBUS_AUTH_COMMAND_BEGIN:
2052 case DBUS_AUTH_COMMAND_OK:
2053 case DBUS_AUTH_COMMAND_ERROR:
2054 case DBUS_AUTH_COMMAND_UNKNOWN:
2055 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2056 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2058 goto_state (auth, &common_state_need_disconnect);
2064 handle_client_state_waiting_for_agree_unix_fd(DBusAuth *auth,
2065 DBusAuthCommand command,
2066 const DBusString *args)
2070 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2071 _dbus_assert(auth->unix_fd_possible);
2072 auth->unix_fd_negotiated = TRUE;
2073 _dbus_verbose("Successfully negotiated UNIX FD passing\n");
2074 return send_begin (auth);
2076 case DBUS_AUTH_COMMAND_ERROR:
2077 _dbus_assert(auth->unix_fd_possible);
2078 auth->unix_fd_negotiated = FALSE;
2079 _dbus_verbose("Failed to negotiate UNIX FD passing\n");
2080 return send_begin (auth);
2082 case DBUS_AUTH_COMMAND_OK:
2083 case DBUS_AUTH_COMMAND_DATA:
2084 case DBUS_AUTH_COMMAND_REJECTED:
2085 case DBUS_AUTH_COMMAND_AUTH:
2086 case DBUS_AUTH_COMMAND_CANCEL:
2087 case DBUS_AUTH_COMMAND_BEGIN:
2088 case DBUS_AUTH_COMMAND_UNKNOWN:
2089 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2091 return send_error (auth, "Unknown command");
2096 * Mapping from command name to enum
2099 const char *name; /**< Name of the command */
2100 DBusAuthCommand command; /**< Corresponding enum */
2101 } DBusAuthCommandName;
2103 static const DBusAuthCommandName auth_command_names[] = {
2104 { "AUTH", DBUS_AUTH_COMMAND_AUTH },
2105 { "CANCEL", DBUS_AUTH_COMMAND_CANCEL },
2106 { "DATA", DBUS_AUTH_COMMAND_DATA },
2107 { "BEGIN", DBUS_AUTH_COMMAND_BEGIN },
2108 { "REJECTED", DBUS_AUTH_COMMAND_REJECTED },
2109 { "OK", DBUS_AUTH_COMMAND_OK },
2110 { "ERROR", DBUS_AUTH_COMMAND_ERROR },
2111 { "NEGOTIATE_UNIX_FD", DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD },
2112 { "AGREE_UNIX_FD", DBUS_AUTH_COMMAND_AGREE_UNIX_FD }
2115 static DBusAuthCommand
2116 lookup_command_from_name (DBusString *command)
2120 for (i = 0; i < _DBUS_N_ELEMENTS (auth_command_names); i++)
2122 if (_dbus_string_equal_c_str (command,
2123 auth_command_names[i].name))
2124 return auth_command_names[i].command;
2127 return DBUS_AUTH_COMMAND_UNKNOWN;
2131 goto_state (DBusAuth *auth,
2132 const DBusAuthStateData *state)
2134 _dbus_verbose ("%s: going from state %s to state %s\n",
2135 DBUS_AUTH_NAME (auth),
2139 auth->state = state;
2142 /* returns whether to call it again right away */
2144 process_command (DBusAuth *auth)
2146 DBusAuthCommand command;
2153 /* _dbus_verbose ("%s: trying process_command()\n"); */
2158 if (!_dbus_string_find (&auth->incoming, 0, "\r\n", &eol))
2161 if (!_dbus_string_init (&line))
2163 auth->needed_memory = TRUE;
2167 if (!_dbus_string_init (&args))
2169 _dbus_string_free (&line);
2170 auth->needed_memory = TRUE;
2174 if (!_dbus_string_copy_len (&auth->incoming, 0, eol, &line, 0))
2177 if (!_dbus_string_validate_ascii (&line, 0,
2178 _dbus_string_get_length (&line)))
2180 _dbus_verbose ("%s: Command contained non-ASCII chars or embedded nul\n",
2181 DBUS_AUTH_NAME (auth));
2182 if (!send_error (auth, "Command contained non-ASCII"))
2188 _dbus_verbose ("%s: got command \"%s\"\n",
2189 DBUS_AUTH_NAME (auth),
2190 _dbus_string_get_const_data (&line));
2192 _dbus_string_find_blank (&line, 0, &i);
2193 _dbus_string_skip_blank (&line, i, &j);
2196 _dbus_string_delete (&line, i, j - i);
2198 if (!_dbus_string_move (&line, i, &args, 0))
2201 /* FIXME 1.0 we should probably validate that only the allowed
2202 * chars are in the command name
2205 command = lookup_command_from_name (&line);
2206 if (!(* auth->state->handler) (auth, command, &args))
2211 /* We've succeeded in processing the whole command so drop it out
2212 * of the incoming buffer and return TRUE to try another command.
2215 _dbus_string_delete (&auth->incoming, 0, eol);
2218 _dbus_string_delete (&auth->incoming, 0, 2);
2223 _dbus_string_free (&args);
2224 _dbus_string_free (&line);
2227 auth->needed_memory = TRUE;
2229 auth->needed_memory = FALSE;
2238 * @addtogroup DBusAuth
2243 * Creates a new auth conversation object for the server side.
2244 * See http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
2245 * for full details on what this object does.
2247 * @returns the new object or #NULL if no memory
2250 _dbus_auth_server_new (const DBusString *guid)
2253 DBusAuthServer *server_auth;
2254 DBusString guid_copy;
2256 if (!_dbus_string_init (&guid_copy))
2259 if (!_dbus_string_copy (guid, 0, &guid_copy, 0))
2261 _dbus_string_free (&guid_copy);
2265 auth = _dbus_auth_new (sizeof (DBusAuthServer));
2268 _dbus_string_free (&guid_copy);
2272 auth->side = auth_side_server;
2273 auth->state = &server_state_waiting_for_auth;
2275 server_auth = DBUS_AUTH_SERVER (auth);
2277 server_auth->guid = guid_copy;
2279 /* perhaps this should be per-mechanism with a lower
2282 server_auth->failures = 0;
2283 server_auth->max_failures = 6;
2289 * Creates a new auth conversation object for the client side.
2290 * See http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
2291 * for full details on what this object does.
2293 * @returns the new object or #NULL if no memory
2296 _dbus_auth_client_new (void)
2299 DBusString guid_str;
2301 if (!_dbus_string_init (&guid_str))
2304 auth = _dbus_auth_new (sizeof (DBusAuthClient));
2307 _dbus_string_free (&guid_str);
2311 DBUS_AUTH_CLIENT (auth)->guid_from_server = guid_str;
2313 auth->side = auth_side_client;
2314 auth->state = &client_state_need_send_auth;
2316 /* Start the auth conversation by sending AUTH for our default
2318 if (!send_auth (auth, &all_mechanisms[0]))
2320 _dbus_auth_unref (auth);
2328 * Increments the refcount of an auth object.
2330 * @param auth the auth conversation
2331 * @returns the auth conversation
2334 _dbus_auth_ref (DBusAuth *auth)
2336 _dbus_assert (auth != NULL);
2338 auth->refcount += 1;
2344 * Decrements the refcount of an auth object.
2346 * @param auth the auth conversation
2349 _dbus_auth_unref (DBusAuth *auth)
2351 _dbus_assert (auth != NULL);
2352 _dbus_assert (auth->refcount > 0);
2354 auth->refcount -= 1;
2355 if (auth->refcount == 0)
2357 shutdown_mech (auth);
2359 if (DBUS_AUTH_IS_CLIENT (auth))
2361 _dbus_string_free (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2362 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
2366 _dbus_assert (DBUS_AUTH_IS_SERVER (auth));
2368 _dbus_string_free (& DBUS_AUTH_SERVER (auth)->guid);
2372 _dbus_keyring_unref (auth->keyring);
2374 _dbus_string_free (&auth->context);
2375 _dbus_string_free (&auth->challenge);
2376 _dbus_string_free (&auth->identity);
2377 _dbus_string_free (&auth->incoming);
2378 _dbus_string_free (&auth->outgoing);
2380 dbus_free_string_array (auth->allowed_mechs);
2382 _dbus_credentials_unref (auth->credentials);
2383 _dbus_credentials_unref (auth->authorized_identity);
2384 _dbus_credentials_unref (auth->desired_identity);
2391 * Sets an array of authentication mechanism names
2392 * that we are willing to use.
2394 * @param auth the auth conversation
2395 * @param mechanisms #NULL-terminated array of mechanism names
2396 * @returns #FALSE if no memory
2399 _dbus_auth_set_mechanisms (DBusAuth *auth,
2400 const char **mechanisms)
2404 if (mechanisms != NULL)
2406 copy = _dbus_dup_string_array (mechanisms);
2413 dbus_free_string_array (auth->allowed_mechs);
2415 auth->allowed_mechs = copy;
2421 * @param auth the auth conversation object
2422 * @returns #TRUE if we're in a final state
2424 #define DBUS_AUTH_IN_END_STATE(auth) ((auth)->state->handler == NULL)
2427 * Analyzes buffered input and moves the auth conversation forward,
2428 * returning the new state of the auth conversation.
2430 * @param auth the auth conversation
2431 * @returns the new state
2434 _dbus_auth_do_work (DBusAuth *auth)
2436 auth->needed_memory = FALSE;
2438 /* Max amount we'll buffer up before deciding someone's on crack */
2439 #define MAX_BUFFER (16 * _DBUS_ONE_KILOBYTE)
2443 if (DBUS_AUTH_IN_END_STATE (auth))
2446 if (_dbus_string_get_length (&auth->incoming) > MAX_BUFFER ||
2447 _dbus_string_get_length (&auth->outgoing) > MAX_BUFFER)
2449 goto_state (auth, &common_state_need_disconnect);
2450 _dbus_verbose ("%s: Disconnecting due to excessive data buffered in auth phase\n",
2451 DBUS_AUTH_NAME (auth));
2455 while (process_command (auth));
2457 if (auth->needed_memory)
2458 return DBUS_AUTH_STATE_WAITING_FOR_MEMORY;
2459 else if (_dbus_string_get_length (&auth->outgoing) > 0)
2460 return DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND;
2461 else if (auth->state == &common_state_need_disconnect)
2462 return DBUS_AUTH_STATE_NEED_DISCONNECT;
2463 else if (auth->state == &common_state_authenticated)
2464 return DBUS_AUTH_STATE_AUTHENTICATED;
2465 else return DBUS_AUTH_STATE_WAITING_FOR_INPUT;
2469 * Gets bytes that need to be sent to the peer we're conversing with.
2470 * After writing some bytes, _dbus_auth_bytes_sent() must be called
2471 * to notify the auth object that they were written.
2473 * @param auth the auth conversation
2474 * @param str return location for a ref to the buffer to send
2475 * @returns #FALSE if nothing to send
2478 _dbus_auth_get_bytes_to_send (DBusAuth *auth,
2479 const DBusString **str)
2481 _dbus_assert (auth != NULL);
2482 _dbus_assert (str != NULL);
2486 if (_dbus_string_get_length (&auth->outgoing) == 0)
2489 *str = &auth->outgoing;
2495 * Notifies the auth conversation object that
2496 * the given number of bytes of the outgoing buffer
2497 * have been written out.
2499 * @param auth the auth conversation
2500 * @param bytes_sent number of bytes written out
2503 _dbus_auth_bytes_sent (DBusAuth *auth,
2506 _dbus_verbose ("%s: Sent %d bytes of: %s\n",
2507 DBUS_AUTH_NAME (auth),
2509 _dbus_string_get_const_data (&auth->outgoing));
2511 _dbus_string_delete (&auth->outgoing,
2516 * Get a buffer to be used for reading bytes from the peer we're conversing
2517 * with. Bytes should be appended to this buffer.
2519 * @param auth the auth conversation
2520 * @param buffer return location for buffer to append bytes to
2523 _dbus_auth_get_buffer (DBusAuth *auth,
2524 DBusString **buffer)
2526 _dbus_assert (auth != NULL);
2527 _dbus_assert (!auth->buffer_outstanding);
2529 *buffer = &auth->incoming;
2531 auth->buffer_outstanding = TRUE;
2535 * Returns a buffer with new data read into it.
2537 * @param auth the auth conversation
2538 * @param buffer the buffer being returned
2541 _dbus_auth_return_buffer (DBusAuth *auth,
2544 _dbus_assert (buffer == &auth->incoming);
2545 _dbus_assert (auth->buffer_outstanding);
2547 auth->buffer_outstanding = FALSE;
2551 * Returns leftover bytes that were not used as part of the auth
2552 * conversation. These bytes will be part of the message stream
2553 * instead. This function may not be called until authentication has
2556 * @param auth the auth conversation
2557 * @param str return location for pointer to string of unused bytes
2560 _dbus_auth_get_unused_bytes (DBusAuth *auth,
2561 const DBusString **str)
2563 if (!DBUS_AUTH_IN_END_STATE (auth))
2566 *str = &auth->incoming;
2571 * Gets rid of unused bytes returned by _dbus_auth_get_unused_bytes()
2572 * after we've gotten them and successfully moved them elsewhere.
2574 * @param auth the auth conversation
2577 _dbus_auth_delete_unused_bytes (DBusAuth *auth)
2579 if (!DBUS_AUTH_IN_END_STATE (auth))
2582 _dbus_string_set_length (&auth->incoming, 0);
2586 * Called post-authentication, indicates whether we need to encode
2587 * the message stream with _dbus_auth_encode_data() prior to
2588 * sending it to the peer.
2590 * @param auth the auth conversation
2591 * @returns #TRUE if we need to encode the stream
2594 _dbus_auth_needs_encoding (DBusAuth *auth)
2596 if (auth->state != &common_state_authenticated)
2599 if (auth->mech != NULL)
2601 if (DBUS_AUTH_IS_CLIENT (auth))
2602 return auth->mech->client_encode_func != NULL;
2604 return auth->mech->server_encode_func != NULL;
2611 * Called post-authentication, encodes a block of bytes for sending to
2612 * the peer. If no encoding was negotiated, just copies the bytes
2613 * (you can avoid this by checking _dbus_auth_needs_encoding()).
2615 * @param auth the auth conversation
2616 * @param plaintext the plain text data
2617 * @param encoded initialized string to where encoded data is appended
2618 * @returns #TRUE if we had enough memory and successfully encoded
2621 _dbus_auth_encode_data (DBusAuth *auth,
2622 const DBusString *plaintext,
2623 DBusString *encoded)
2625 _dbus_assert (plaintext != encoded);
2627 if (auth->state != &common_state_authenticated)
2630 if (_dbus_auth_needs_encoding (auth))
2632 if (DBUS_AUTH_IS_CLIENT (auth))
2633 return (* auth->mech->client_encode_func) (auth, plaintext, encoded);
2635 return (* auth->mech->server_encode_func) (auth, plaintext, encoded);
2639 return _dbus_string_copy (plaintext, 0, encoded,
2640 _dbus_string_get_length (encoded));
2645 * Called post-authentication, indicates whether we need to decode
2646 * the message stream with _dbus_auth_decode_data() after
2647 * receiving it from the peer.
2649 * @param auth the auth conversation
2650 * @returns #TRUE if we need to encode the stream
2653 _dbus_auth_needs_decoding (DBusAuth *auth)
2655 if (auth->state != &common_state_authenticated)
2658 if (auth->mech != NULL)
2660 if (DBUS_AUTH_IS_CLIENT (auth))
2661 return auth->mech->client_decode_func != NULL;
2663 return auth->mech->server_decode_func != NULL;
2671 * Called post-authentication, decodes a block of bytes received from
2672 * the peer. If no encoding was negotiated, just copies the bytes (you
2673 * can avoid this by checking _dbus_auth_needs_decoding()).
2675 * @todo 1.0? We need to be able to distinguish "out of memory" error
2676 * from "the data is hosed" error.
2678 * @param auth the auth conversation
2679 * @param encoded the encoded data
2680 * @param plaintext initialized string where decoded data is appended
2681 * @returns #TRUE if we had enough memory and successfully decoded
2684 _dbus_auth_decode_data (DBusAuth *auth,
2685 const DBusString *encoded,
2686 DBusString *plaintext)
2688 _dbus_assert (plaintext != encoded);
2690 if (auth->state != &common_state_authenticated)
2693 if (_dbus_auth_needs_decoding (auth))
2695 if (DBUS_AUTH_IS_CLIENT (auth))
2696 return (* auth->mech->client_decode_func) (auth, encoded, plaintext);
2698 return (* auth->mech->server_decode_func) (auth, encoded, plaintext);
2702 return _dbus_string_copy (encoded, 0, plaintext,
2703 _dbus_string_get_length (plaintext));
2708 * Sets credentials received via reliable means from the operating
2711 * @param auth the auth conversation
2712 * @param credentials the credentials received
2713 * @returns #FALSE on OOM
2716 _dbus_auth_set_credentials (DBusAuth *auth,
2717 DBusCredentials *credentials)
2719 _dbus_credentials_clear (auth->credentials);
2720 return _dbus_credentials_add_credentials (auth->credentials,
2725 * Gets the identity we authorized the client as. Apps may have
2726 * different policies as to what identities they allow.
2728 * Returned credentials are not a copy and should not be modified
2730 * @param auth the auth conversation
2731 * @returns the credentials we've authorized BY REFERENCE do not modify
2734 _dbus_auth_get_identity (DBusAuth *auth)
2736 if (auth->state == &common_state_authenticated)
2738 return auth->authorized_identity;
2742 /* FIXME instead of this, keep an empty credential around that
2743 * doesn't require allocation or something
2745 /* return empty credentials */
2746 _dbus_assert (_dbus_credentials_are_empty (auth->authorized_identity));
2747 return auth->authorized_identity;
2752 * Gets the GUID from the server if we've authenticated; gets
2754 * @param auth the auth object
2755 * @returns the GUID in ASCII hex format
2758 _dbus_auth_get_guid_from_server (DBusAuth *auth)
2760 _dbus_assert (DBUS_AUTH_IS_CLIENT (auth));
2762 if (auth->state == &common_state_authenticated)
2763 return _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2769 * Sets the "authentication context" which scopes cookies
2770 * with the DBUS_COOKIE_SHA1 auth mechanism for example.
2772 * @param auth the auth conversation
2773 * @param context the context
2774 * @returns #FALSE if no memory
2777 _dbus_auth_set_context (DBusAuth *auth,
2778 const DBusString *context)
2780 return _dbus_string_replace_len (context, 0, _dbus_string_get_length (context),
2781 &auth->context, 0, _dbus_string_get_length (context));
2785 * Sets whether unix fd passing is potentially on the transport and
2786 * hence shall be negotiated.
2788 * @param auth the auth conversation
2789 * @param b TRUE when unix fd passing shall be negotiated, otherwise FALSE
2792 _dbus_auth_set_unix_fd_possible(DBusAuth *auth, dbus_bool_t b)
2794 auth->unix_fd_possible = b;
2798 * Queries whether unix fd passing was successfully negotiated.
2800 * @param auth the auth conversion
2801 * @returns #TRUE when unix fd passing was negotiated.
2804 _dbus_auth_get_unix_fd_negotiated(DBusAuth *auth)
2806 return auth->unix_fd_negotiated;
2811 /* tests in dbus-auth-util.c */