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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "dbus-auth.h"
24 #include "dbus-string.h"
25 #include "dbus-list.h"
26 #include "dbus-internals.h"
27 #include "dbus-keyring.h"
29 #include "dbus-protocol.h"
30 #include "dbus-credentials.h"
33 * @defgroup DBusAuth Authentication
34 * @ingroup DBusInternals
35 * @brief DBusAuth object
37 * DBusAuth manages the authentication negotiation when a connection
38 * is first established, and also manage any encryption used over a
41 * @todo some SASL profiles require sending the empty string as a
42 * challenge/response, but we don't currently allow that in our
45 * @todo right now sometimes both ends will block waiting for input
46 * from the other end, e.g. if there's an error during
49 * @todo the cookie keyring needs to be cached globally not just
50 * per-auth (which raises threadsafety issues too)
52 * @todo grep FIXME in dbus-auth.c
56 * @defgroup DBusAuthInternals Authentication implementation details
57 * @ingroup DBusInternals
58 * @brief DBusAuth implementation details
60 * Private details of authentication code.
66 * This function appends an initial client response to the given string
68 typedef dbus_bool_t (* DBusInitialResponseFunction) (DBusAuth *auth,
69 DBusString *response);
72 * This function processes a block of data received from the peer.
73 * i.e. handles a DATA command.
75 typedef dbus_bool_t (* DBusAuthDataFunction) (DBusAuth *auth,
76 const DBusString *data);
79 * This function encodes a block of data from the peer.
81 typedef dbus_bool_t (* DBusAuthEncodeFunction) (DBusAuth *auth,
82 const DBusString *data,
86 * This function decodes a block of data from the peer.
88 typedef dbus_bool_t (* DBusAuthDecodeFunction) (DBusAuth *auth,
89 const DBusString *data,
93 * This function is called when the mechanism is abandoned.
95 typedef void (* DBusAuthShutdownFunction) (DBusAuth *auth);
98 * Virtual table representing a particular auth mechanism.
102 const char *mechanism; /**< Name of the mechanism */
103 DBusAuthDataFunction server_data_func; /**< Function on server side for DATA */
104 DBusAuthEncodeFunction server_encode_func; /**< Function on server side to encode */
105 DBusAuthDecodeFunction server_decode_func; /**< Function on server side to decode */
106 DBusAuthShutdownFunction server_shutdown_func; /**< Function on server side to shut down */
107 DBusInitialResponseFunction client_initial_response_func; /**< Function on client side to handle initial response */
108 DBusAuthDataFunction client_data_func; /**< Function on client side for DATA */
109 DBusAuthEncodeFunction client_encode_func; /**< Function on client side for encode */
110 DBusAuthDecodeFunction client_decode_func; /**< Function on client side for decode */
111 DBusAuthShutdownFunction client_shutdown_func; /**< Function on client side for shutdown */
112 } DBusAuthMechanismHandler;
115 * Enumeration for the known authentication commands.
118 DBUS_AUTH_COMMAND_AUTH,
119 DBUS_AUTH_COMMAND_CANCEL,
120 DBUS_AUTH_COMMAND_DATA,
121 DBUS_AUTH_COMMAND_BEGIN,
122 DBUS_AUTH_COMMAND_REJECTED,
123 DBUS_AUTH_COMMAND_OK,
124 DBUS_AUTH_COMMAND_ERROR,
125 DBUS_AUTH_COMMAND_UNKNOWN
129 * Auth state function, determines the reaction to incoming events for
130 * a particular state. Returns whether we had enough memory to
131 * complete the operation.
133 typedef dbus_bool_t (* DBusAuthStateFunction) (DBusAuth *auth,
134 DBusAuthCommand command,
135 const DBusString *args);
138 * Information about a auth state.
142 const char *name; /**< Name of the state */
143 DBusAuthStateFunction handler; /**< State function for this state */
147 * Internal members of DBusAuth.
151 int refcount; /**< reference count */
152 const char *side; /**< Client or server */
154 DBusString incoming; /**< Incoming data buffer */
155 DBusString outgoing; /**< Outgoing data buffer */
157 const DBusAuthStateData *state; /**< Current protocol state */
159 const DBusAuthMechanismHandler *mech; /**< Current auth mechanism */
161 DBusString identity; /**< Current identity we're authorizing
165 DBusCredentials *credentials; /**< Credentials read from socket
168 DBusCredentials *authorized_identity; /**< Credentials that are authorized */
170 DBusCredentials *desired_identity; /**< Identity client has requested */
172 DBusString context; /**< Cookie scope */
173 DBusKeyring *keyring; /**< Keyring for cookie mechanism. */
174 int cookie_id; /**< ID of cookie to use */
175 DBusString challenge; /**< Challenge sent to client */
177 char **allowed_mechs; /**< Mechanisms we're allowed to use,
178 * or #NULL if we can use any
181 unsigned int needed_memory : 1; /**< We needed memory to continue since last
182 * successful getting something done
184 unsigned int already_got_mechanisms : 1; /**< Client already got mech list */
185 unsigned int already_asked_for_initial_response : 1; /**< Already sent a blank challenge to get an initial response */
186 unsigned int buffer_outstanding : 1; /**< Buffer is "checked out" for reading data into */
190 * "Subclass" of DBusAuth for client side
194 DBusAuth base; /**< Parent class */
196 DBusList *mechs_to_try; /**< Mechanisms we got from the server that we're going to try using */
198 DBusString guid_from_server; /**< GUID received from server */
203 * "Subclass" of DBusAuth for server side.
207 DBusAuth base; /**< Parent class */
209 int failures; /**< Number of times client has been rejected */
210 int max_failures; /**< Number of times we reject before disconnect */
212 DBusString guid; /**< Our globally unique ID in hex encoding */
216 static void goto_state (DBusAuth *auth,
217 const DBusAuthStateData *new_state);
218 static dbus_bool_t send_auth (DBusAuth *auth,
219 const DBusAuthMechanismHandler *mech);
220 static dbus_bool_t send_data (DBusAuth *auth,
222 static dbus_bool_t send_rejected (DBusAuth *auth);
223 static dbus_bool_t send_error (DBusAuth *auth,
224 const char *message);
225 static dbus_bool_t send_ok (DBusAuth *auth);
226 static dbus_bool_t send_begin (DBusAuth *auth,
227 const DBusString *args_from_ok);
228 static dbus_bool_t send_cancel (DBusAuth *auth);
234 static dbus_bool_t handle_server_state_waiting_for_auth (DBusAuth *auth,
235 DBusAuthCommand command,
236 const DBusString *args);
237 static dbus_bool_t handle_server_state_waiting_for_data (DBusAuth *auth,
238 DBusAuthCommand command,
239 const DBusString *args);
240 static dbus_bool_t handle_server_state_waiting_for_begin (DBusAuth *auth,
241 DBusAuthCommand command,
242 const DBusString *args);
244 static const DBusAuthStateData server_state_waiting_for_auth = {
245 "WaitingForAuth", handle_server_state_waiting_for_auth
247 static const DBusAuthStateData server_state_waiting_for_data = {
248 "WaitingForData", handle_server_state_waiting_for_data
250 static const DBusAuthStateData server_state_waiting_for_begin = {
251 "WaitingForBegin", handle_server_state_waiting_for_begin
258 static dbus_bool_t handle_client_state_waiting_for_data (DBusAuth *auth,
259 DBusAuthCommand command,
260 const DBusString *args);
261 static dbus_bool_t handle_client_state_waiting_for_ok (DBusAuth *auth,
262 DBusAuthCommand command,
263 const DBusString *args);
264 static dbus_bool_t handle_client_state_waiting_for_reject (DBusAuth *auth,
265 DBusAuthCommand command,
266 const DBusString *args);
268 static const DBusAuthStateData client_state_need_send_auth = {
271 static const DBusAuthStateData client_state_waiting_for_data = {
272 "WaitingForData", handle_client_state_waiting_for_data
274 static const DBusAuthStateData client_state_waiting_for_ok = {
275 "WaitingForOK", handle_client_state_waiting_for_ok
277 static const DBusAuthStateData client_state_waiting_for_reject = {
278 "WaitingForReject", handle_client_state_waiting_for_reject
282 * Common terminal states. Terminal states have handler == NULL.
285 static const DBusAuthStateData common_state_authenticated = {
286 "Authenticated", NULL
289 static const DBusAuthStateData common_state_need_disconnect = {
290 "NeedDisconnect", NULL
293 static const char auth_side_client[] = "client";
294 static const char auth_side_server[] = "server";
296 * @param auth the auth conversation
297 * @returns #TRUE if the conversation is the server side
299 #define DBUS_AUTH_IS_SERVER(auth) ((auth)->side == auth_side_server)
301 * @param auth the auth conversation
302 * @returns #TRUE if the conversation is the client side
304 #define DBUS_AUTH_IS_CLIENT(auth) ((auth)->side == auth_side_client)
306 * @param auth the auth conversation
307 * @returns auth cast to DBusAuthClient
309 #define DBUS_AUTH_CLIENT(auth) ((DBusAuthClient*)(auth))
311 * @param auth the auth conversation
312 * @returns auth cast to DBusAuthServer
314 #define DBUS_AUTH_SERVER(auth) ((DBusAuthServer*)(auth))
317 * The name of the auth ("client" or "server")
318 * @param auth the auth conversation
321 #define DBUS_AUTH_NAME(auth) ((auth)->side)
324 _dbus_auth_new (int size)
328 auth = dbus_malloc0 (size);
334 auth->keyring = NULL;
335 auth->cookie_id = -1;
337 /* note that we don't use the max string length feature,
338 * because you can't use that feature if you're going to
339 * try to recover from out-of-memory (it creates
340 * what looks like unrecoverable inability to alloc
341 * more space in the string). But we do handle
342 * overlong buffers in _dbus_auth_do_work().
345 if (!_dbus_string_init (&auth->incoming))
348 if (!_dbus_string_init (&auth->outgoing))
351 if (!_dbus_string_init (&auth->identity))
354 if (!_dbus_string_init (&auth->context))
357 if (!_dbus_string_init (&auth->challenge))
360 /* default context if none is specified */
361 if (!_dbus_string_append (&auth->context, "org_freedesktop_general"))
364 auth->credentials = _dbus_credentials_new ();
365 if (auth->credentials == NULL)
368 auth->authorized_identity = _dbus_credentials_new ();
369 if (auth->authorized_identity == NULL)
372 auth->desired_identity = _dbus_credentials_new ();
373 if (auth->desired_identity == NULL)
380 _dbus_credentials_unref (auth->desired_identity);
383 _dbus_credentials_unref (auth->authorized_identity);
385 _dbus_credentials_unref (auth->credentials);
387 /* last alloc was an append to context, which is freed already below */ ;
389 _dbus_string_free (&auth->challenge);
391 _dbus_string_free (&auth->context);
393 _dbus_string_free (&auth->identity);
395 _dbus_string_free (&auth->outgoing);
397 _dbus_string_free (&auth->incoming);
404 shutdown_mech (DBusAuth *auth)
406 /* Cancel any auth */
407 auth->already_asked_for_initial_response = FALSE;
408 _dbus_string_set_length (&auth->identity, 0);
410 _dbus_credentials_clear (auth->authorized_identity);
411 _dbus_credentials_clear (auth->desired_identity);
413 if (auth->mech != NULL)
415 _dbus_verbose ("%s: Shutting down mechanism %s\n",
416 DBUS_AUTH_NAME (auth), auth->mech->mechanism);
418 if (DBUS_AUTH_IS_CLIENT (auth))
419 (* auth->mech->client_shutdown_func) (auth);
421 (* auth->mech->server_shutdown_func) (auth);
428 * DBUS_COOKIE_SHA1 mechanism
431 /* Returns TRUE but with an empty string hash if the
432 * cookie_id isn't known. As with all this code
433 * TRUE just means we had enough memory.
436 sha1_compute_hash (DBusAuth *auth,
438 const DBusString *server_challenge,
439 const DBusString *client_challenge,
446 _dbus_assert (auth->keyring != NULL);
450 if (!_dbus_string_init (&cookie))
453 if (!_dbus_keyring_get_hex_key (auth->keyring, cookie_id,
457 if (_dbus_string_get_length (&cookie) == 0)
463 if (!_dbus_string_init (&to_hash))
466 if (!_dbus_string_copy (server_challenge, 0,
467 &to_hash, _dbus_string_get_length (&to_hash)))
470 if (!_dbus_string_append (&to_hash, ":"))
473 if (!_dbus_string_copy (client_challenge, 0,
474 &to_hash, _dbus_string_get_length (&to_hash)))
477 if (!_dbus_string_append (&to_hash, ":"))
480 if (!_dbus_string_copy (&cookie, 0,
481 &to_hash, _dbus_string_get_length (&to_hash)))
484 if (!_dbus_sha_compute (&to_hash, hash))
490 _dbus_string_zero (&to_hash);
491 _dbus_string_free (&to_hash);
493 _dbus_string_zero (&cookie);
494 _dbus_string_free (&cookie);
498 /** http://www.ietf.org/rfc/rfc2831.txt suggests at least 64 bits of
499 * entropy, we use 128. This is the number of bytes in the random
502 #define N_CHALLENGE_BYTES (128/8)
505 sha1_handle_first_client_response (DBusAuth *auth,
506 const DBusString *data)
508 /* We haven't sent a challenge yet, we're expecting a desired
509 * username from the client.
518 _dbus_string_set_length (&auth->challenge, 0);
520 if (_dbus_string_get_length (data) > 0)
522 if (_dbus_string_get_length (&auth->identity) > 0)
524 /* Tried to send two auth identities, wtf */
525 _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
526 DBUS_AUTH_NAME (auth));
527 return send_rejected (auth);
531 /* this is our auth identity */
532 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
537 if (!_dbus_credentials_add_from_user (auth->desired_identity, data))
539 _dbus_verbose ("%s: Did not get a valid username from client\n",
540 DBUS_AUTH_NAME (auth));
541 return send_rejected (auth);
544 if (!_dbus_string_init (&tmp))
547 if (!_dbus_string_init (&tmp2))
549 _dbus_string_free (&tmp);
553 /* we cache the keyring for speed, so here we drop it if it's the
554 * wrong one. FIXME caching the keyring here is useless since we use
555 * a different DBusAuth for every connection.
558 !_dbus_keyring_is_for_credentials (auth->keyring,
559 auth->desired_identity))
561 _dbus_keyring_unref (auth->keyring);
562 auth->keyring = NULL;
565 if (auth->keyring == NULL)
567 dbus_error_init (&error);
568 auth->keyring = _dbus_keyring_new_for_credentials (auth->desired_identity,
572 if (auth->keyring == NULL)
574 if (dbus_error_has_name (&error,
575 DBUS_ERROR_NO_MEMORY))
577 dbus_error_free (&error);
582 _DBUS_ASSERT_ERROR_IS_SET (&error);
583 _dbus_verbose ("%s: Error loading keyring: %s\n",
584 DBUS_AUTH_NAME (auth), error.message);
585 if (send_rejected (auth))
586 retval = TRUE; /* retval is only about mem */
587 dbus_error_free (&error);
593 _dbus_assert (!dbus_error_is_set (&error));
597 _dbus_assert (auth->keyring != NULL);
599 dbus_error_init (&error);
600 auth->cookie_id = _dbus_keyring_get_best_key (auth->keyring, &error);
601 if (auth->cookie_id < 0)
603 _DBUS_ASSERT_ERROR_IS_SET (&error);
604 _dbus_verbose ("%s: Could not get a cookie ID to send to client: %s\n",
605 DBUS_AUTH_NAME (auth), error.message);
606 if (send_rejected (auth))
608 dbus_error_free (&error);
613 _dbus_assert (!dbus_error_is_set (&error));
616 if (!_dbus_string_copy (&auth->context, 0,
617 &tmp2, _dbus_string_get_length (&tmp2)))
620 if (!_dbus_string_append (&tmp2, " "))
623 if (!_dbus_string_append_int (&tmp2, auth->cookie_id))
626 if (!_dbus_string_append (&tmp2, " "))
629 if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES))
632 _dbus_string_set_length (&auth->challenge, 0);
633 if (!_dbus_string_hex_encode (&tmp, 0, &auth->challenge, 0))
636 if (!_dbus_string_hex_encode (&tmp, 0, &tmp2,
637 _dbus_string_get_length (&tmp2)))
640 if (!send_data (auth, &tmp2))
643 goto_state (auth, &server_state_waiting_for_data);
647 _dbus_string_zero (&tmp);
648 _dbus_string_free (&tmp);
649 _dbus_string_zero (&tmp2);
650 _dbus_string_free (&tmp2);
656 sha1_handle_second_client_response (DBusAuth *auth,
657 const DBusString *data)
659 /* We are expecting a response which is the hex-encoded client
660 * challenge, space, then SHA-1 hash of the concatenation of our
661 * challenge, ":", client challenge, ":", secret key, all
665 DBusString client_challenge;
666 DBusString client_hash;
668 DBusString correct_hash;
672 if (!_dbus_string_find_blank (data, 0, &i))
674 _dbus_verbose ("%s: no space separator in client response\n",
675 DBUS_AUTH_NAME (auth));
676 return send_rejected (auth);
679 if (!_dbus_string_init (&client_challenge))
682 if (!_dbus_string_init (&client_hash))
685 if (!_dbus_string_copy_len (data, 0, i, &client_challenge,
689 _dbus_string_skip_blank (data, i, &i);
691 if (!_dbus_string_copy_len (data, i,
692 _dbus_string_get_length (data) - i,
697 if (_dbus_string_get_length (&client_challenge) == 0 ||
698 _dbus_string_get_length (&client_hash) == 0)
700 _dbus_verbose ("%s: zero-length client challenge or hash\n",
701 DBUS_AUTH_NAME (auth));
702 if (send_rejected (auth))
707 if (!_dbus_string_init (&correct_hash))
710 if (!sha1_compute_hash (auth, auth->cookie_id,
716 /* if cookie_id was invalid, then we get an empty hash */
717 if (_dbus_string_get_length (&correct_hash) == 0)
719 if (send_rejected (auth))
724 if (!_dbus_string_equal (&client_hash, &correct_hash))
726 if (send_rejected (auth))
731 if (!_dbus_credentials_add_credentials (auth->authorized_identity,
732 auth->desired_identity))
735 /* Copy process ID from the socket credentials if it's there
737 if (!_dbus_credentials_add_credential (auth->authorized_identity,
738 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
745 _dbus_verbose ("%s: authenticated client using DBUS_COOKIE_SHA1\n",
746 DBUS_AUTH_NAME (auth));
751 _dbus_string_zero (&correct_hash);
752 _dbus_string_free (&correct_hash);
754 _dbus_string_zero (&client_hash);
755 _dbus_string_free (&client_hash);
757 _dbus_string_free (&client_challenge);
763 handle_server_data_cookie_sha1_mech (DBusAuth *auth,
764 const DBusString *data)
766 if (auth->cookie_id < 0)
767 return sha1_handle_first_client_response (auth, data);
769 return sha1_handle_second_client_response (auth, data);
773 handle_server_shutdown_cookie_sha1_mech (DBusAuth *auth)
775 auth->cookie_id = -1;
776 _dbus_string_set_length (&auth->challenge, 0);
780 handle_client_initial_response_cookie_sha1_mech (DBusAuth *auth,
781 DBusString *response)
788 if (!_dbus_string_init (&username))
791 if (!_dbus_append_user_from_current_process (&username))
794 if (!_dbus_string_hex_encode (&username, 0,
796 _dbus_string_get_length (response)))
802 _dbus_string_free (&username);
808 handle_client_data_cookie_sha1_mech (DBusAuth *auth,
809 const DBusString *data)
811 /* The data we get from the server should be the cookie context
812 * name, the cookie ID, and the server challenge, separated by
813 * spaces. We send back our challenge string and the correct hash.
817 DBusString cookie_id_str;
818 DBusString server_challenge;
819 DBusString client_challenge;
820 DBusString correct_hash;
827 if (!_dbus_string_find_blank (data, 0, &i))
829 if (send_error (auth,
830 "Server did not send context/ID/challenge properly"))
835 if (!_dbus_string_init (&context))
838 if (!_dbus_string_copy_len (data, 0, i,
842 _dbus_string_skip_blank (data, i, &i);
843 if (!_dbus_string_find_blank (data, i, &j))
845 if (send_error (auth,
846 "Server did not send context/ID/challenge properly"))
851 if (!_dbus_string_init (&cookie_id_str))
854 if (!_dbus_string_copy_len (data, i, j - i,
858 if (!_dbus_string_init (&server_challenge))
862 _dbus_string_skip_blank (data, i, &i);
863 j = _dbus_string_get_length (data);
865 if (!_dbus_string_copy_len (data, i, j - i,
866 &server_challenge, 0))
869 if (!_dbus_keyring_validate_context (&context))
871 if (send_error (auth, "Server sent invalid cookie context"))
876 if (!_dbus_string_parse_int (&cookie_id_str, 0, &val, NULL))
878 if (send_error (auth, "Could not parse cookie ID as an integer"))
883 if (_dbus_string_get_length (&server_challenge) == 0)
885 if (send_error (auth, "Empty server challenge string"))
890 if (auth->keyring == NULL)
894 dbus_error_init (&error);
895 auth->keyring = _dbus_keyring_new_for_credentials (NULL,
899 if (auth->keyring == NULL)
901 if (dbus_error_has_name (&error,
902 DBUS_ERROR_NO_MEMORY))
904 dbus_error_free (&error);
909 _DBUS_ASSERT_ERROR_IS_SET (&error);
911 _dbus_verbose ("%s: Error loading keyring: %s\n",
912 DBUS_AUTH_NAME (auth), error.message);
914 if (send_error (auth, "Could not load cookie file"))
915 retval = TRUE; /* retval is only about mem */
917 dbus_error_free (&error);
923 _dbus_assert (!dbus_error_is_set (&error));
927 _dbus_assert (auth->keyring != NULL);
929 if (!_dbus_string_init (&tmp))
932 if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES))
935 if (!_dbus_string_init (&client_challenge))
938 if (!_dbus_string_hex_encode (&tmp, 0, &client_challenge, 0))
941 if (!_dbus_string_init (&correct_hash))
944 if (!sha1_compute_hash (auth, val,
950 if (_dbus_string_get_length (&correct_hash) == 0)
952 /* couldn't find the cookie ID or something */
953 if (send_error (auth, "Don't have the requested cookie ID"))
958 _dbus_string_set_length (&tmp, 0);
960 if (!_dbus_string_copy (&client_challenge, 0, &tmp,
961 _dbus_string_get_length (&tmp)))
964 if (!_dbus_string_append (&tmp, " "))
967 if (!_dbus_string_copy (&correct_hash, 0, &tmp,
968 _dbus_string_get_length (&tmp)))
971 if (!send_data (auth, &tmp))
977 _dbus_string_zero (&correct_hash);
978 _dbus_string_free (&correct_hash);
980 _dbus_string_free (&client_challenge);
982 _dbus_string_zero (&tmp);
983 _dbus_string_free (&tmp);
985 _dbus_string_free (&server_challenge);
987 _dbus_string_free (&cookie_id_str);
989 _dbus_string_free (&context);
995 handle_client_shutdown_cookie_sha1_mech (DBusAuth *auth)
997 auth->cookie_id = -1;
998 _dbus_string_set_length (&auth->challenge, 0);
1002 * EXTERNAL mechanism
1006 handle_server_data_external_mech (DBusAuth *auth,
1007 const DBusString *data)
1009 if (_dbus_credentials_are_anonymous (auth->credentials))
1011 _dbus_verbose ("%s: no credentials, mechanism EXTERNAL can't authenticate\n",
1012 DBUS_AUTH_NAME (auth));
1013 return send_rejected (auth);
1016 if (_dbus_string_get_length (data) > 0)
1018 if (_dbus_string_get_length (&auth->identity) > 0)
1020 /* Tried to send two auth identities, wtf */
1021 _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
1022 DBUS_AUTH_NAME (auth));
1023 return send_rejected (auth);
1027 /* this is our auth identity */
1028 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
1033 /* Poke client for an auth identity, if none given */
1034 if (_dbus_string_get_length (&auth->identity) == 0 &&
1035 !auth->already_asked_for_initial_response)
1037 if (send_data (auth, NULL))
1039 _dbus_verbose ("%s: sending empty challenge asking client for auth identity\n",
1040 DBUS_AUTH_NAME (auth));
1041 auth->already_asked_for_initial_response = TRUE;
1042 goto_state (auth, &server_state_waiting_for_data);
1049 _dbus_credentials_clear (auth->desired_identity);
1051 /* If auth->identity is still empty here, then client
1052 * responded with an empty string after we poked it for
1053 * an initial response. This means to try to auth the
1054 * identity provided in the credentials.
1056 if (_dbus_string_get_length (&auth->identity) == 0)
1058 if (!_dbus_credentials_add_credentials (auth->desired_identity,
1061 return FALSE; /* OOM */
1066 if (!_dbus_credentials_add_from_user (auth->desired_identity,
1069 _dbus_verbose ("%s: could not get credentials from uid string\n",
1070 DBUS_AUTH_NAME (auth));
1071 return send_rejected (auth);
1075 if (_dbus_credentials_are_anonymous (auth->desired_identity))
1077 _dbus_verbose ("%s: desired user %s is no good\n",
1078 DBUS_AUTH_NAME (auth),
1079 _dbus_string_get_const_data (&auth->identity));
1080 return send_rejected (auth);
1083 if (_dbus_credentials_are_superset (auth->credentials,
1084 auth->desired_identity))
1086 /* client has authenticated */
1087 if (!_dbus_credentials_add_credentials (auth->authorized_identity,
1088 auth->desired_identity))
1091 /* also copy process ID from the socket credentials
1093 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1094 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1098 /* also copy audit data from the socket credentials
1100 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1101 DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID,
1105 if (!send_ok (auth))
1108 _dbus_verbose ("%s: authenticated client based on socket credentials\n",
1109 DBUS_AUTH_NAME (auth));
1115 _dbus_verbose ("%s: desired identity not found in socket credentials\n",
1116 DBUS_AUTH_NAME (auth));
1117 return send_rejected (auth);
1122 handle_server_shutdown_external_mech (DBusAuth *auth)
1128 handle_client_initial_response_external_mech (DBusAuth *auth,
1129 DBusString *response)
1131 /* We always append our UID as an initial response, so the server
1132 * doesn't have to send back an empty challenge to check whether we
1133 * want to specify an identity. i.e. this avoids a round trip that
1134 * the spec for the EXTERNAL mechanism otherwise requires.
1136 DBusString plaintext;
1138 if (!_dbus_string_init (&plaintext))
1141 if (!_dbus_append_user_from_current_process (&plaintext))
1144 if (!_dbus_string_hex_encode (&plaintext, 0,
1146 _dbus_string_get_length (response)))
1149 _dbus_string_free (&plaintext);
1154 _dbus_string_free (&plaintext);
1159 handle_client_data_external_mech (DBusAuth *auth,
1160 const DBusString *data)
1167 handle_client_shutdown_external_mech (DBusAuth *auth)
1173 * ANONYMOUS mechanism
1177 handle_server_data_anonymous_mech (DBusAuth *auth,
1178 const DBusString *data)
1180 if (_dbus_string_get_length (data) > 0)
1182 /* Client is allowed to send "trace" data, the only defined
1183 * meaning is that if it contains '@' it is an email address,
1184 * and otherwise it is anything else, and it's supposed to be
1187 if (!_dbus_string_validate_utf8 (data, 0, _dbus_string_get_length (data)))
1189 _dbus_verbose ("%s: Received invalid UTF-8 trace data from ANONYMOUS client\n",
1190 DBUS_AUTH_NAME (auth));
1193 DBusString plaintext;
1195 _dbus_string_init_const (&plaintext, "D-Bus " VERSION);
1196 _dbus_string_init (&encoded);
1197 _dbus_string_hex_encode (&plaintext, 0,
1200 _dbus_verbose ("%s: try '%s'\n",
1201 DBUS_AUTH_NAME (auth), _dbus_string_get_const_data (&encoded));
1203 return send_rejected (auth);
1206 _dbus_verbose ("%s: ANONYMOUS client sent trace string: '%s'\n",
1207 DBUS_AUTH_NAME (auth),
1208 _dbus_string_get_const_data (data));
1211 /* We want to be anonymous (clear in case some other protocol got midway through I guess) */
1212 _dbus_credentials_clear (auth->desired_identity);
1214 /* Copy process ID from the socket credentials
1216 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1217 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1221 /* Anonymous is always allowed */
1222 if (!send_ok (auth))
1225 _dbus_verbose ("%s: authenticated client as anonymous\n",
1226 DBUS_AUTH_NAME (auth));
1232 handle_server_shutdown_anonymous_mech (DBusAuth *auth)
1238 handle_client_initial_response_anonymous_mech (DBusAuth *auth,
1239 DBusString *response)
1241 /* Our initial response is a "trace" string which must be valid UTF-8
1242 * and must be an email address if it contains '@'.
1243 * We just send the dbus implementation info, like a user-agent or
1244 * something, because... why not. There's nothing guaranteed here
1245 * though, we could change it later.
1247 DBusString plaintext;
1249 if (!_dbus_string_init (&plaintext))
1252 if (!_dbus_string_append (&plaintext,
1253 "libdbus " VERSION))
1256 if (!_dbus_string_hex_encode (&plaintext, 0,
1258 _dbus_string_get_length (response)))
1261 _dbus_string_free (&plaintext);
1266 _dbus_string_free (&plaintext);
1271 handle_client_data_anonymous_mech (DBusAuth *auth,
1272 const DBusString *data)
1279 handle_client_shutdown_anonymous_mech (DBusAuth *auth)
1284 /* Put mechanisms here in order of preference.
1285 * Right now we have:
1287 * - EXTERNAL checks socket credentials (or in the future, other info from the OS)
1288 * - DBUS_COOKIE_SHA1 uses a cookie in the home directory, like xauth or ICE
1289 * - ANONYMOUS checks nothing but doesn't auth the person as a user
1291 * We might ideally add a mechanism to chain to Cyrus SASL so we can
1292 * use its mechanisms as well.
1295 static const DBusAuthMechanismHandler
1296 all_mechanisms[] = {
1298 handle_server_data_external_mech,
1300 handle_server_shutdown_external_mech,
1301 handle_client_initial_response_external_mech,
1302 handle_client_data_external_mech,
1304 handle_client_shutdown_external_mech },
1305 { "DBUS_COOKIE_SHA1",
1306 handle_server_data_cookie_sha1_mech,
1308 handle_server_shutdown_cookie_sha1_mech,
1309 handle_client_initial_response_cookie_sha1_mech,
1310 handle_client_data_cookie_sha1_mech,
1312 handle_client_shutdown_cookie_sha1_mech },
1314 handle_server_data_anonymous_mech,
1316 handle_server_shutdown_anonymous_mech,
1317 handle_client_initial_response_anonymous_mech,
1318 handle_client_data_anonymous_mech,
1320 handle_client_shutdown_anonymous_mech },
1324 static const DBusAuthMechanismHandler*
1325 find_mech (const DBusString *name,
1326 char **allowed_mechs)
1330 if (allowed_mechs != NULL &&
1331 !_dbus_string_array_contains ((const char**) allowed_mechs,
1332 _dbus_string_get_const_data (name)))
1336 while (all_mechanisms[i].mechanism != NULL)
1338 if (_dbus_string_equal_c_str (name,
1339 all_mechanisms[i].mechanism))
1341 return &all_mechanisms[i];
1350 send_auth (DBusAuth *auth, const DBusAuthMechanismHandler *mech)
1352 DBusString auth_command;
1354 if (!_dbus_string_init (&auth_command))
1357 if (!_dbus_string_append (&auth_command,
1360 _dbus_string_free (&auth_command);
1364 if (!_dbus_string_append (&auth_command,
1367 _dbus_string_free (&auth_command);
1371 if (mech->client_initial_response_func != NULL)
1373 if (!_dbus_string_append (&auth_command, " "))
1375 _dbus_string_free (&auth_command);
1379 if (!(* mech->client_initial_response_func) (auth, &auth_command))
1381 _dbus_string_free (&auth_command);
1386 if (!_dbus_string_append (&auth_command,
1389 _dbus_string_free (&auth_command);
1393 if (!_dbus_string_copy (&auth_command, 0,
1395 _dbus_string_get_length (&auth->outgoing)))
1397 _dbus_string_free (&auth_command);
1401 _dbus_string_free (&auth_command);
1402 shutdown_mech (auth);
1404 goto_state (auth, &client_state_waiting_for_data);
1410 send_data (DBusAuth *auth, DBusString *data)
1414 if (data == NULL || _dbus_string_get_length (data) == 0)
1415 return _dbus_string_append (&auth->outgoing, "DATA\r\n");
1418 old_len = _dbus_string_get_length (&auth->outgoing);
1419 if (!_dbus_string_append (&auth->outgoing, "DATA "))
1422 if (!_dbus_string_hex_encode (data, 0, &auth->outgoing,
1423 _dbus_string_get_length (&auth->outgoing)))
1426 if (!_dbus_string_append (&auth->outgoing, "\r\n"))
1432 _dbus_string_set_length (&auth->outgoing, old_len);
1439 send_rejected (DBusAuth *auth)
1442 DBusAuthServer *server_auth;
1445 if (!_dbus_string_init (&command))
1448 if (!_dbus_string_append (&command,
1453 while (all_mechanisms[i].mechanism != NULL)
1455 if (!_dbus_string_append (&command,
1459 if (!_dbus_string_append (&command,
1460 all_mechanisms[i].mechanism))
1466 if (!_dbus_string_append (&command, "\r\n"))
1469 if (!_dbus_string_copy (&command, 0, &auth->outgoing,
1470 _dbus_string_get_length (&auth->outgoing)))
1473 shutdown_mech (auth);
1475 _dbus_assert (DBUS_AUTH_IS_SERVER (auth));
1476 server_auth = DBUS_AUTH_SERVER (auth);
1477 server_auth->failures += 1;
1479 if (server_auth->failures >= server_auth->max_failures)
1480 goto_state (auth, &common_state_need_disconnect);
1482 goto_state (auth, &server_state_waiting_for_auth);
1484 _dbus_string_free (&command);
1489 _dbus_string_free (&command);
1494 send_error (DBusAuth *auth, const char *message)
1496 return _dbus_string_append_printf (&auth->outgoing,
1497 "ERROR \"%s\"\r\n", message);
1501 send_ok (DBusAuth *auth)
1505 orig_len = _dbus_string_get_length (&auth->outgoing);
1507 if (_dbus_string_append (&auth->outgoing, "OK ") &&
1508 _dbus_string_copy (& DBUS_AUTH_SERVER (auth)->guid,
1511 _dbus_string_get_length (&auth->outgoing)) &&
1512 _dbus_string_append (&auth->outgoing, "\r\n"))
1514 goto_state (auth, &server_state_waiting_for_begin);
1519 _dbus_string_set_length (&auth->outgoing, orig_len);
1525 send_begin (DBusAuth *auth,
1526 const DBusString *args_from_ok)
1530 /* "args_from_ok" should be the GUID, whitespace already pulled off the front */
1531 _dbus_assert (_dbus_string_get_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server) == 0);
1533 /* We decode the hex string to binary, using guid_from_server as scratch... */
1536 if (!_dbus_string_hex_decode (args_from_ok, 0, &end_of_hex,
1537 & DBUS_AUTH_CLIENT (auth)->guid_from_server, 0))
1540 /* now clear out the scratch */
1541 _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1543 if (end_of_hex != _dbus_string_get_length (args_from_ok) ||
1546 _dbus_verbose ("Bad GUID from server, parsed %d bytes and had %d bytes from server\n",
1547 end_of_hex, _dbus_string_get_length (args_from_ok));
1548 goto_state (auth, &common_state_need_disconnect);
1552 if (_dbus_string_copy (args_from_ok, 0, &DBUS_AUTH_CLIENT (auth)->guid_from_server, 0) &&
1553 _dbus_string_append (&auth->outgoing, "BEGIN\r\n"))
1555 _dbus_verbose ("Got GUID '%s' from the server\n",
1556 _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server));
1558 goto_state (auth, &common_state_authenticated);
1563 _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1569 send_cancel (DBusAuth *auth)
1571 if (_dbus_string_append (&auth->outgoing, "CANCEL\r\n"))
1573 goto_state (auth, &client_state_waiting_for_reject);
1581 process_data (DBusAuth *auth,
1582 const DBusString *args,
1583 DBusAuthDataFunction data_func)
1588 if (!_dbus_string_init (&decoded))
1591 if (!_dbus_string_hex_decode (args, 0, &end, &decoded, 0))
1593 _dbus_string_free (&decoded);
1597 if (_dbus_string_get_length (args) != end)
1599 _dbus_string_free (&decoded);
1600 if (!send_error (auth, "Invalid hex encoding"))
1606 #ifdef DBUS_ENABLE_VERBOSE_MODE
1607 if (_dbus_string_validate_ascii (&decoded, 0,
1608 _dbus_string_get_length (&decoded)))
1609 _dbus_verbose ("%s: data: '%s'\n",
1610 DBUS_AUTH_NAME (auth),
1611 _dbus_string_get_const_data (&decoded));
1614 if (!(* data_func) (auth, &decoded))
1616 _dbus_string_free (&decoded);
1620 _dbus_string_free (&decoded);
1625 handle_auth (DBusAuth *auth, const DBusString *args)
1627 if (_dbus_string_get_length (args) == 0)
1629 /* No args to the auth, send mechanisms */
1630 if (!send_rejected (auth))
1639 DBusString hex_response;
1641 _dbus_string_find_blank (args, 0, &i);
1643 if (!_dbus_string_init (&mech))
1646 if (!_dbus_string_init (&hex_response))
1648 _dbus_string_free (&mech);
1652 if (!_dbus_string_copy_len (args, 0, i, &mech, 0))
1655 _dbus_string_skip_blank (args, i, &i);
1656 if (!_dbus_string_copy (args, i, &hex_response, 0))
1659 auth->mech = find_mech (&mech, auth->allowed_mechs);
1660 if (auth->mech != NULL)
1662 _dbus_verbose ("%s: Trying mechanism %s\n",
1663 DBUS_AUTH_NAME (auth),
1664 auth->mech->mechanism);
1666 if (!process_data (auth, &hex_response,
1667 auth->mech->server_data_func))
1672 /* Unsupported mechanism */
1673 _dbus_verbose ("%s: Unsupported mechanism %s\n",
1674 DBUS_AUTH_NAME (auth),
1675 _dbus_string_get_const_data (&mech));
1677 if (!send_rejected (auth))
1681 _dbus_string_free (&mech);
1682 _dbus_string_free (&hex_response);
1688 _dbus_string_free (&mech);
1689 _dbus_string_free (&hex_response);
1695 handle_server_state_waiting_for_auth (DBusAuth *auth,
1696 DBusAuthCommand command,
1697 const DBusString *args)
1701 case DBUS_AUTH_COMMAND_AUTH:
1702 return handle_auth (auth, args);
1704 case DBUS_AUTH_COMMAND_CANCEL:
1705 case DBUS_AUTH_COMMAND_DATA:
1706 return send_error (auth, "Not currently in an auth conversation");
1708 case DBUS_AUTH_COMMAND_BEGIN:
1709 goto_state (auth, &common_state_need_disconnect);
1712 case DBUS_AUTH_COMMAND_ERROR:
1713 return send_rejected (auth);
1715 case DBUS_AUTH_COMMAND_REJECTED:
1716 case DBUS_AUTH_COMMAND_OK:
1717 case DBUS_AUTH_COMMAND_UNKNOWN:
1719 return send_error (auth, "Unknown command");
1724 handle_server_state_waiting_for_data (DBusAuth *auth,
1725 DBusAuthCommand command,
1726 const DBusString *args)
1730 case DBUS_AUTH_COMMAND_AUTH:
1731 return send_error (auth, "Sent AUTH while another AUTH in progress");
1733 case DBUS_AUTH_COMMAND_CANCEL:
1734 case DBUS_AUTH_COMMAND_ERROR:
1735 return send_rejected (auth);
1737 case DBUS_AUTH_COMMAND_DATA:
1738 return process_data (auth, args, auth->mech->server_data_func);
1740 case DBUS_AUTH_COMMAND_BEGIN:
1741 goto_state (auth, &common_state_need_disconnect);
1744 case DBUS_AUTH_COMMAND_REJECTED:
1745 case DBUS_AUTH_COMMAND_OK:
1746 case DBUS_AUTH_COMMAND_UNKNOWN:
1748 return send_error (auth, "Unknown command");
1753 handle_server_state_waiting_for_begin (DBusAuth *auth,
1754 DBusAuthCommand command,
1755 const DBusString *args)
1759 case DBUS_AUTH_COMMAND_AUTH:
1760 return send_error (auth, "Sent AUTH while expecting BEGIN");
1762 case DBUS_AUTH_COMMAND_DATA:
1763 return send_error (auth, "Sent DATA while expecting BEGIN");
1765 case DBUS_AUTH_COMMAND_BEGIN:
1766 goto_state (auth, &common_state_authenticated);
1769 case DBUS_AUTH_COMMAND_REJECTED:
1770 case DBUS_AUTH_COMMAND_OK:
1771 case DBUS_AUTH_COMMAND_UNKNOWN:
1773 return send_error (auth, "Unknown command");
1775 case DBUS_AUTH_COMMAND_CANCEL:
1776 case DBUS_AUTH_COMMAND_ERROR:
1777 return send_rejected (auth);
1781 /* return FALSE if no memory, TRUE if all OK */
1783 get_word (const DBusString *str,
1789 _dbus_string_skip_blank (str, *start, start);
1790 _dbus_string_find_blank (str, *start, &i);
1794 if (!_dbus_string_copy_len (str, *start, i - *start, word, 0))
1804 record_mechanisms (DBusAuth *auth,
1805 const DBusString *args)
1810 if (auth->already_got_mechanisms)
1813 len = _dbus_string_get_length (args);
1819 const DBusAuthMechanismHandler *mech;
1821 if (!_dbus_string_init (&m))
1824 if (!get_word (args, &next, &m))
1826 _dbus_string_free (&m);
1830 mech = find_mech (&m, auth->allowed_mechs);
1834 /* FIXME right now we try mechanisms in the order
1835 * the server lists them; should we do them in
1836 * some more deterministic order?
1838 * Probably in all_mechanisms order, our order of
1839 * preference. Of course when the server is us,
1840 * it lists things in that order anyhow.
1843 if (mech != &all_mechanisms[0])
1845 _dbus_verbose ("%s: Adding mechanism %s to list we will try\n",
1846 DBUS_AUTH_NAME (auth), mech->mechanism);
1848 if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
1851 _dbus_string_free (&m);
1857 _dbus_verbose ("%s: Already tried mechanism %s; not adding to list we will try\n",
1858 DBUS_AUTH_NAME (auth), mech->mechanism);
1863 _dbus_verbose ("%s: Server offered mechanism \"%s\" that we don't know how to use\n",
1864 DBUS_AUTH_NAME (auth),
1865 _dbus_string_get_const_data (&m));
1868 _dbus_string_free (&m);
1871 auth->already_got_mechanisms = TRUE;
1876 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
1882 process_rejected (DBusAuth *auth, const DBusString *args)
1884 const DBusAuthMechanismHandler *mech;
1885 DBusAuthClient *client;
1887 client = DBUS_AUTH_CLIENT (auth);
1889 if (!auth->already_got_mechanisms)
1891 if (!record_mechanisms (auth, args))
1895 if (DBUS_AUTH_CLIENT (auth)->mechs_to_try != NULL)
1897 mech = client->mechs_to_try->data;
1899 if (!send_auth (auth, mech))
1902 _dbus_list_pop_first (&client->mechs_to_try);
1904 _dbus_verbose ("%s: Trying mechanism %s\n",
1905 DBUS_AUTH_NAME (auth),
1911 _dbus_verbose ("%s: Disconnecting because we are out of mechanisms to try using\n",
1912 DBUS_AUTH_NAME (auth));
1913 goto_state (auth, &common_state_need_disconnect);
1921 handle_client_state_waiting_for_data (DBusAuth *auth,
1922 DBusAuthCommand command,
1923 const DBusString *args)
1925 _dbus_assert (auth->mech != NULL);
1929 case DBUS_AUTH_COMMAND_DATA:
1930 return process_data (auth, args, auth->mech->client_data_func);
1932 case DBUS_AUTH_COMMAND_REJECTED:
1933 return process_rejected (auth, args);
1935 case DBUS_AUTH_COMMAND_OK:
1936 return send_begin (auth, args);
1938 case DBUS_AUTH_COMMAND_ERROR:
1939 return send_cancel (auth);
1941 case DBUS_AUTH_COMMAND_AUTH:
1942 case DBUS_AUTH_COMMAND_CANCEL:
1943 case DBUS_AUTH_COMMAND_BEGIN:
1944 case DBUS_AUTH_COMMAND_UNKNOWN:
1946 return send_error (auth, "Unknown command");
1951 handle_client_state_waiting_for_ok (DBusAuth *auth,
1952 DBusAuthCommand command,
1953 const DBusString *args)
1957 case DBUS_AUTH_COMMAND_REJECTED:
1958 return process_rejected (auth, args);
1960 case DBUS_AUTH_COMMAND_OK:
1961 return send_begin (auth, args);
1963 case DBUS_AUTH_COMMAND_DATA:
1964 case DBUS_AUTH_COMMAND_ERROR:
1965 return send_cancel (auth);
1967 case DBUS_AUTH_COMMAND_AUTH:
1968 case DBUS_AUTH_COMMAND_CANCEL:
1969 case DBUS_AUTH_COMMAND_BEGIN:
1970 case DBUS_AUTH_COMMAND_UNKNOWN:
1972 return send_error (auth, "Unknown command");
1977 handle_client_state_waiting_for_reject (DBusAuth *auth,
1978 DBusAuthCommand command,
1979 const DBusString *args)
1983 case DBUS_AUTH_COMMAND_REJECTED:
1984 return process_rejected (auth, args);
1986 case DBUS_AUTH_COMMAND_AUTH:
1987 case DBUS_AUTH_COMMAND_CANCEL:
1988 case DBUS_AUTH_COMMAND_DATA:
1989 case DBUS_AUTH_COMMAND_BEGIN:
1990 case DBUS_AUTH_COMMAND_OK:
1991 case DBUS_AUTH_COMMAND_ERROR:
1992 case DBUS_AUTH_COMMAND_UNKNOWN:
1994 goto_state (auth, &common_state_need_disconnect);
2000 * Mapping from command name to enum
2003 const char *name; /**< Name of the command */
2004 DBusAuthCommand command; /**< Corresponding enum */
2005 } DBusAuthCommandName;
2007 static const DBusAuthCommandName auth_command_names[] = {
2008 { "AUTH", DBUS_AUTH_COMMAND_AUTH },
2009 { "CANCEL", DBUS_AUTH_COMMAND_CANCEL },
2010 { "DATA", DBUS_AUTH_COMMAND_DATA },
2011 { "BEGIN", DBUS_AUTH_COMMAND_BEGIN },
2012 { "REJECTED", DBUS_AUTH_COMMAND_REJECTED },
2013 { "OK", DBUS_AUTH_COMMAND_OK },
2014 { "ERROR", DBUS_AUTH_COMMAND_ERROR }
2017 static DBusAuthCommand
2018 lookup_command_from_name (DBusString *command)
2022 for (i = 0; i < _DBUS_N_ELEMENTS (auth_command_names); i++)
2024 if (_dbus_string_equal_c_str (command,
2025 auth_command_names[i].name))
2026 return auth_command_names[i].command;
2029 return DBUS_AUTH_COMMAND_UNKNOWN;
2033 goto_state (DBusAuth *auth,
2034 const DBusAuthStateData *state)
2036 _dbus_verbose ("%s: going from state %s to state %s\n",
2037 DBUS_AUTH_NAME (auth),
2041 auth->state = state;
2044 /* returns whether to call it again right away */
2046 process_command (DBusAuth *auth)
2048 DBusAuthCommand command;
2055 /* _dbus_verbose ("%s: trying process_command()\n"); */
2060 if (!_dbus_string_find (&auth->incoming, 0, "\r\n", &eol))
2063 if (!_dbus_string_init (&line))
2065 auth->needed_memory = TRUE;
2069 if (!_dbus_string_init (&args))
2071 _dbus_string_free (&line);
2072 auth->needed_memory = TRUE;
2076 if (!_dbus_string_copy_len (&auth->incoming, 0, eol, &line, 0))
2079 if (!_dbus_string_validate_ascii (&line, 0,
2080 _dbus_string_get_length (&line)))
2082 _dbus_verbose ("%s: Command contained non-ASCII chars or embedded nul\n",
2083 DBUS_AUTH_NAME (auth));
2084 if (!send_error (auth, "Command contained non-ASCII"))
2090 _dbus_verbose ("%s: got command \"%s\"\n",
2091 DBUS_AUTH_NAME (auth),
2092 _dbus_string_get_const_data (&line));
2094 _dbus_string_find_blank (&line, 0, &i);
2095 _dbus_string_skip_blank (&line, i, &j);
2098 _dbus_string_delete (&line, i, j - i);
2100 if (!_dbus_string_move (&line, i, &args, 0))
2103 /* FIXME 1.0 we should probably validate that only the allowed
2104 * chars are in the command name
2107 command = lookup_command_from_name (&line);
2108 if (!(* auth->state->handler) (auth, command, &args))
2113 /* We've succeeded in processing the whole command so drop it out
2114 * of the incoming buffer and return TRUE to try another command.
2117 _dbus_string_delete (&auth->incoming, 0, eol);
2120 _dbus_string_delete (&auth->incoming, 0, 2);
2125 _dbus_string_free (&args);
2126 _dbus_string_free (&line);
2129 auth->needed_memory = TRUE;
2131 auth->needed_memory = FALSE;
2140 * @addtogroup DBusAuth
2145 * Creates a new auth conversation object for the server side.
2146 * See doc/dbus-sasl-profile.txt for full details on what
2149 * @returns the new object or #NULL if no memory
2152 _dbus_auth_server_new (const DBusString *guid)
2155 DBusAuthServer *server_auth;
2156 DBusString guid_copy;
2158 if (!_dbus_string_init (&guid_copy))
2161 if (!_dbus_string_copy (guid, 0, &guid_copy, 0))
2163 _dbus_string_free (&guid_copy);
2167 auth = _dbus_auth_new (sizeof (DBusAuthServer));
2170 _dbus_string_free (&guid_copy);
2174 auth->side = auth_side_server;
2175 auth->state = &server_state_waiting_for_auth;
2177 server_auth = DBUS_AUTH_SERVER (auth);
2179 server_auth->guid = guid_copy;
2181 /* perhaps this should be per-mechanism with a lower
2184 server_auth->failures = 0;
2185 server_auth->max_failures = 6;
2191 * Creates a new auth conversation object for the client side.
2192 * See doc/dbus-sasl-profile.txt for full details on what
2195 * @returns the new object or #NULL if no memory
2198 _dbus_auth_client_new (void)
2201 DBusString guid_str;
2203 if (!_dbus_string_init (&guid_str))
2206 auth = _dbus_auth_new (sizeof (DBusAuthClient));
2209 _dbus_string_free (&guid_str);
2213 DBUS_AUTH_CLIENT (auth)->guid_from_server = guid_str;
2215 auth->side = auth_side_client;
2216 auth->state = &client_state_need_send_auth;
2218 /* Start the auth conversation by sending AUTH for our default
2220 if (!send_auth (auth, &all_mechanisms[0]))
2222 _dbus_auth_unref (auth);
2230 * Increments the refcount of an auth object.
2232 * @param auth the auth conversation
2233 * @returns the auth conversation
2236 _dbus_auth_ref (DBusAuth *auth)
2238 _dbus_assert (auth != NULL);
2240 auth->refcount += 1;
2246 * Decrements the refcount of an auth object.
2248 * @param auth the auth conversation
2251 _dbus_auth_unref (DBusAuth *auth)
2253 _dbus_assert (auth != NULL);
2254 _dbus_assert (auth->refcount > 0);
2256 auth->refcount -= 1;
2257 if (auth->refcount == 0)
2259 shutdown_mech (auth);
2261 if (DBUS_AUTH_IS_CLIENT (auth))
2263 _dbus_string_free (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2264 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
2268 _dbus_assert (DBUS_AUTH_IS_SERVER (auth));
2270 _dbus_string_free (& DBUS_AUTH_SERVER (auth)->guid);
2274 _dbus_keyring_unref (auth->keyring);
2276 _dbus_string_free (&auth->context);
2277 _dbus_string_free (&auth->challenge);
2278 _dbus_string_free (&auth->identity);
2279 _dbus_string_free (&auth->incoming);
2280 _dbus_string_free (&auth->outgoing);
2282 dbus_free_string_array (auth->allowed_mechs);
2284 _dbus_credentials_unref (auth->credentials);
2285 _dbus_credentials_unref (auth->authorized_identity);
2286 _dbus_credentials_unref (auth->desired_identity);
2293 * Sets an array of authentication mechanism names
2294 * that we are willing to use.
2296 * @param auth the auth conversation
2297 * @param mechanisms #NULL-terminated array of mechanism names
2298 * @returns #FALSE if no memory
2301 _dbus_auth_set_mechanisms (DBusAuth *auth,
2302 const char **mechanisms)
2306 if (mechanisms != NULL)
2308 copy = _dbus_dup_string_array (mechanisms);
2315 dbus_free_string_array (auth->allowed_mechs);
2317 auth->allowed_mechs = copy;
2323 * @param auth the auth conversation object
2324 * @returns #TRUE if we're in a final state
2326 #define DBUS_AUTH_IN_END_STATE(auth) ((auth)->state->handler == NULL)
2329 * Analyzes buffered input and moves the auth conversation forward,
2330 * returning the new state of the auth conversation.
2332 * @param auth the auth conversation
2333 * @returns the new state
2336 _dbus_auth_do_work (DBusAuth *auth)
2338 auth->needed_memory = FALSE;
2340 /* Max amount we'll buffer up before deciding someone's on crack */
2341 #define MAX_BUFFER (16 * _DBUS_ONE_KILOBYTE)
2345 if (DBUS_AUTH_IN_END_STATE (auth))
2348 if (_dbus_string_get_length (&auth->incoming) > MAX_BUFFER ||
2349 _dbus_string_get_length (&auth->outgoing) > MAX_BUFFER)
2351 goto_state (auth, &common_state_need_disconnect);
2352 _dbus_verbose ("%s: Disconnecting due to excessive data buffered in auth phase\n",
2353 DBUS_AUTH_NAME (auth));
2357 while (process_command (auth));
2359 if (auth->needed_memory)
2360 return DBUS_AUTH_STATE_WAITING_FOR_MEMORY;
2361 else if (_dbus_string_get_length (&auth->outgoing) > 0)
2362 return DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND;
2363 else if (auth->state == &common_state_need_disconnect)
2364 return DBUS_AUTH_STATE_NEED_DISCONNECT;
2365 else if (auth->state == &common_state_authenticated)
2366 return DBUS_AUTH_STATE_AUTHENTICATED;
2367 else return DBUS_AUTH_STATE_WAITING_FOR_INPUT;
2371 * Gets bytes that need to be sent to the peer we're conversing with.
2372 * After writing some bytes, _dbus_auth_bytes_sent() must be called
2373 * to notify the auth object that they were written.
2375 * @param auth the auth conversation
2376 * @param str return location for a ref to the buffer to send
2377 * @returns #FALSE if nothing to send
2380 _dbus_auth_get_bytes_to_send (DBusAuth *auth,
2381 const DBusString **str)
2383 _dbus_assert (auth != NULL);
2384 _dbus_assert (str != NULL);
2388 if (_dbus_string_get_length (&auth->outgoing) == 0)
2391 *str = &auth->outgoing;
2397 * Notifies the auth conversation object that
2398 * the given number of bytes of the outgoing buffer
2399 * have been written out.
2401 * @param auth the auth conversation
2402 * @param bytes_sent number of bytes written out
2405 _dbus_auth_bytes_sent (DBusAuth *auth,
2408 _dbus_verbose ("%s: Sent %d bytes of: %s\n",
2409 DBUS_AUTH_NAME (auth),
2411 _dbus_string_get_const_data (&auth->outgoing));
2413 _dbus_string_delete (&auth->outgoing,
2418 * Get a buffer to be used for reading bytes from the peer we're conversing
2419 * with. Bytes should be appended to this buffer.
2421 * @param auth the auth conversation
2422 * @param buffer return location for buffer to append bytes to
2425 _dbus_auth_get_buffer (DBusAuth *auth,
2426 DBusString **buffer)
2428 _dbus_assert (auth != NULL);
2429 _dbus_assert (!auth->buffer_outstanding);
2431 *buffer = &auth->incoming;
2433 auth->buffer_outstanding = TRUE;
2437 * Returns a buffer with new data read into it.
2439 * @param auth the auth conversation
2440 * @param buffer the buffer being returned
2441 * @param bytes_read number of new bytes added
2444 _dbus_auth_return_buffer (DBusAuth *auth,
2448 _dbus_assert (buffer == &auth->incoming);
2449 _dbus_assert (auth->buffer_outstanding);
2451 auth->buffer_outstanding = FALSE;
2455 * Returns leftover bytes that were not used as part of the auth
2456 * conversation. These bytes will be part of the message stream
2457 * instead. This function may not be called until authentication has
2460 * @param auth the auth conversation
2461 * @param str return location for pointer to string of unused bytes
2464 _dbus_auth_get_unused_bytes (DBusAuth *auth,
2465 const DBusString **str)
2467 if (!DBUS_AUTH_IN_END_STATE (auth))
2470 *str = &auth->incoming;
2475 * Gets rid of unused bytes returned by _dbus_auth_get_unused_bytes()
2476 * after we've gotten them and successfully moved them elsewhere.
2478 * @param auth the auth conversation
2481 _dbus_auth_delete_unused_bytes (DBusAuth *auth)
2483 if (!DBUS_AUTH_IN_END_STATE (auth))
2486 _dbus_string_set_length (&auth->incoming, 0);
2490 * Called post-authentication, indicates whether we need to encode
2491 * the message stream with _dbus_auth_encode_data() prior to
2492 * sending it to the peer.
2494 * @param auth the auth conversation
2495 * @returns #TRUE if we need to encode the stream
2498 _dbus_auth_needs_encoding (DBusAuth *auth)
2500 if (auth->state != &common_state_authenticated)
2503 if (auth->mech != NULL)
2505 if (DBUS_AUTH_IS_CLIENT (auth))
2506 return auth->mech->client_encode_func != NULL;
2508 return auth->mech->server_encode_func != NULL;
2515 * Called post-authentication, encodes a block of bytes for sending to
2516 * the peer. If no encoding was negotiated, just copies the bytes
2517 * (you can avoid this by checking _dbus_auth_needs_encoding()).
2519 * @param auth the auth conversation
2520 * @param plaintext the plain text data
2521 * @param encoded initialized string to where encoded data is appended
2522 * @returns #TRUE if we had enough memory and successfully encoded
2525 _dbus_auth_encode_data (DBusAuth *auth,
2526 const DBusString *plaintext,
2527 DBusString *encoded)
2529 _dbus_assert (plaintext != encoded);
2531 if (auth->state != &common_state_authenticated)
2534 if (_dbus_auth_needs_encoding (auth))
2536 if (DBUS_AUTH_IS_CLIENT (auth))
2537 return (* auth->mech->client_encode_func) (auth, plaintext, encoded);
2539 return (* auth->mech->server_encode_func) (auth, plaintext, encoded);
2543 return _dbus_string_copy (plaintext, 0, encoded,
2544 _dbus_string_get_length (encoded));
2549 * Called post-authentication, indicates whether we need to decode
2550 * the message stream with _dbus_auth_decode_data() after
2551 * receiving it from the peer.
2553 * @param auth the auth conversation
2554 * @returns #TRUE if we need to encode the stream
2557 _dbus_auth_needs_decoding (DBusAuth *auth)
2559 if (auth->state != &common_state_authenticated)
2562 if (auth->mech != NULL)
2564 if (DBUS_AUTH_IS_CLIENT (auth))
2565 return auth->mech->client_decode_func != NULL;
2567 return auth->mech->server_decode_func != NULL;
2575 * Called post-authentication, decodes a block of bytes received from
2576 * the peer. If no encoding was negotiated, just copies the bytes (you
2577 * can avoid this by checking _dbus_auth_needs_decoding()).
2579 * @todo 1.0? We need to be able to distinguish "out of memory" error
2580 * from "the data is hosed" error.
2582 * @param auth the auth conversation
2583 * @param encoded the encoded data
2584 * @param plaintext initialized string where decoded data is appended
2585 * @returns #TRUE if we had enough memory and successfully decoded
2588 _dbus_auth_decode_data (DBusAuth *auth,
2589 const DBusString *encoded,
2590 DBusString *plaintext)
2592 _dbus_assert (plaintext != encoded);
2594 if (auth->state != &common_state_authenticated)
2597 if (_dbus_auth_needs_decoding (auth))
2599 if (DBUS_AUTH_IS_CLIENT (auth))
2600 return (* auth->mech->client_decode_func) (auth, encoded, plaintext);
2602 return (* auth->mech->server_decode_func) (auth, encoded, plaintext);
2606 return _dbus_string_copy (encoded, 0, plaintext,
2607 _dbus_string_get_length (plaintext));
2612 * Sets credentials received via reliable means from the operating
2615 * @param auth the auth conversation
2616 * @param credentials the credentials received
2617 * @returns #FALSE on OOM
2620 _dbus_auth_set_credentials (DBusAuth *auth,
2621 DBusCredentials *credentials)
2623 _dbus_credentials_clear (auth->credentials);
2624 return _dbus_credentials_add_credentials (auth->credentials,
2629 * Gets the identity we authorized the client as. Apps may have
2630 * different policies as to what identities they allow.
2632 * Returned credentials are not a copy and should not be modified
2634 * @param auth the auth conversation
2635 * @returns the credentials we've authorized BY REFERENCE do not modify
2638 _dbus_auth_get_identity (DBusAuth *auth)
2640 if (auth->state == &common_state_authenticated)
2642 return auth->authorized_identity;
2646 /* FIXME instead of this, keep an empty credential around that
2647 * doesn't require allocation or something
2649 /* return empty credentials */
2650 _dbus_assert (_dbus_credentials_are_empty (auth->authorized_identity));
2651 return auth->authorized_identity;
2656 * Gets the GUID from the server if we've authenticated; gets
2658 * @param auth the auth object
2659 * @returns the GUID in ASCII hex format
2662 _dbus_auth_get_guid_from_server (DBusAuth *auth)
2664 _dbus_assert (DBUS_AUTH_IS_CLIENT (auth));
2666 if (auth->state == &common_state_authenticated)
2667 return _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2673 * Sets the "authentication context" which scopes cookies
2674 * with the DBUS_COOKIE_SHA1 auth mechanism for example.
2676 * @param auth the auth conversation
2677 * @param context the context
2678 * @returns #FALSE if no memory
2681 _dbus_auth_set_context (DBusAuth *auth,
2682 const DBusString *context)
2684 return _dbus_string_replace_len (context, 0, _dbus_string_get_length (context),
2685 &auth->context, 0, _dbus_string_get_length (context));
2690 /* tests in dbus-auth-util.c */