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.
527 dbus_bool_t retval = FALSE;
528 DBusError error = DBUS_ERROR_INIT;
530 _dbus_string_set_length (&auth->challenge, 0);
532 if (_dbus_string_get_length (data) > 0)
534 if (_dbus_string_get_length (&auth->identity) > 0)
536 /* Tried to send two auth identities, wtf */
537 _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
538 DBUS_AUTH_NAME (auth));
539 return send_rejected (auth);
543 /* this is our auth identity */
544 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
549 if (!_dbus_credentials_add_from_user (auth->desired_identity, data))
551 _dbus_verbose ("%s: Did not get a valid username from client\n",
552 DBUS_AUTH_NAME (auth));
553 return send_rejected (auth);
556 if (!_dbus_string_init (&tmp))
559 if (!_dbus_string_init (&tmp2))
561 _dbus_string_free (&tmp);
565 /* we cache the keyring for speed, so here we drop it if it's the
566 * wrong one. FIXME caching the keyring here is useless since we use
567 * a different DBusAuth for every connection.
570 !_dbus_keyring_is_for_credentials (auth->keyring,
571 auth->desired_identity))
573 _dbus_keyring_unref (auth->keyring);
574 auth->keyring = NULL;
577 if (auth->keyring == NULL)
579 auth->keyring = _dbus_keyring_new_for_credentials (auth->desired_identity,
583 if (auth->keyring == NULL)
585 if (dbus_error_has_name (&error,
586 DBUS_ERROR_NO_MEMORY))
588 dbus_error_free (&error);
593 _DBUS_ASSERT_ERROR_IS_SET (&error);
594 _dbus_verbose ("%s: Error loading keyring: %s\n",
595 DBUS_AUTH_NAME (auth), error.message);
596 if (send_rejected (auth))
597 retval = TRUE; /* retval is only about mem */
598 dbus_error_free (&error);
604 _dbus_assert (!dbus_error_is_set (&error));
608 _dbus_assert (auth->keyring != NULL);
610 auth->cookie_id = _dbus_keyring_get_best_key (auth->keyring, &error);
611 if (auth->cookie_id < 0)
613 _DBUS_ASSERT_ERROR_IS_SET (&error);
614 _dbus_verbose ("%s: Could not get a cookie ID to send to client: %s\n",
615 DBUS_AUTH_NAME (auth), error.message);
616 if (send_rejected (auth))
618 dbus_error_free (&error);
623 _dbus_assert (!dbus_error_is_set (&error));
626 if (!_dbus_string_copy (&auth->context, 0,
627 &tmp2, _dbus_string_get_length (&tmp2)))
630 if (!_dbus_string_append (&tmp2, " "))
633 if (!_dbus_string_append_int (&tmp2, auth->cookie_id))
636 if (!_dbus_string_append (&tmp2, " "))
639 if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES, &error))
641 if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
643 dbus_error_free (&error);
648 _DBUS_ASSERT_ERROR_IS_SET (&error);
649 _dbus_verbose ("%s: Error generating challenge: %s\n",
650 DBUS_AUTH_NAME (auth), error.message);
651 if (send_rejected (auth))
652 retval = TRUE; /* retval is only about mem */
654 dbus_error_free (&error);
659 _dbus_string_set_length (&auth->challenge, 0);
660 if (!_dbus_string_hex_encode (&tmp, 0, &auth->challenge, 0))
663 if (!_dbus_string_hex_encode (&tmp, 0, &tmp2,
664 _dbus_string_get_length (&tmp2)))
667 if (!send_data (auth, &tmp2))
670 goto_state (auth, &server_state_waiting_for_data);
674 _dbus_string_zero (&tmp);
675 _dbus_string_free (&tmp);
676 _dbus_string_zero (&tmp2);
677 _dbus_string_free (&tmp2);
683 sha1_handle_second_client_response (DBusAuth *auth,
684 const DBusString *data)
686 /* We are expecting a response which is the hex-encoded client
687 * challenge, space, then SHA-1 hash of the concatenation of our
688 * challenge, ":", client challenge, ":", secret key, all
692 DBusString client_challenge;
693 DBusString client_hash;
695 DBusString correct_hash;
699 if (!_dbus_string_find_blank (data, 0, &i))
701 _dbus_verbose ("%s: no space separator in client response\n",
702 DBUS_AUTH_NAME (auth));
703 return send_rejected (auth);
706 if (!_dbus_string_init (&client_challenge))
709 if (!_dbus_string_init (&client_hash))
712 if (!_dbus_string_copy_len (data, 0, i, &client_challenge,
716 _dbus_string_skip_blank (data, i, &i);
718 if (!_dbus_string_copy_len (data, i,
719 _dbus_string_get_length (data) - i,
724 if (_dbus_string_get_length (&client_challenge) == 0 ||
725 _dbus_string_get_length (&client_hash) == 0)
727 _dbus_verbose ("%s: zero-length client challenge or hash\n",
728 DBUS_AUTH_NAME (auth));
729 if (send_rejected (auth))
734 if (!_dbus_string_init (&correct_hash))
737 if (!sha1_compute_hash (auth, auth->cookie_id,
743 /* if cookie_id was invalid, then we get an empty hash */
744 if (_dbus_string_get_length (&correct_hash) == 0)
746 if (send_rejected (auth))
751 if (!_dbus_string_equal (&client_hash, &correct_hash))
753 if (send_rejected (auth))
758 if (!_dbus_credentials_add_credentials (auth->authorized_identity,
759 auth->desired_identity))
762 /* Copy process ID from the socket credentials if it's there
764 if (!_dbus_credentials_add_credential (auth->authorized_identity,
765 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
772 _dbus_verbose ("%s: authenticated client using DBUS_COOKIE_SHA1\n",
773 DBUS_AUTH_NAME (auth));
778 _dbus_string_zero (&correct_hash);
779 _dbus_string_free (&correct_hash);
781 _dbus_string_zero (&client_hash);
782 _dbus_string_free (&client_hash);
784 _dbus_string_free (&client_challenge);
790 handle_server_data_cookie_sha1_mech (DBusAuth *auth,
791 const DBusString *data)
793 if (auth->cookie_id < 0)
794 return sha1_handle_first_client_response (auth, data);
796 return sha1_handle_second_client_response (auth, data);
800 handle_server_shutdown_cookie_sha1_mech (DBusAuth *auth)
802 auth->cookie_id = -1;
803 _dbus_string_set_length (&auth->challenge, 0);
807 handle_client_initial_response_cookie_sha1_mech (DBusAuth *auth,
808 DBusString *response)
815 if (!_dbus_string_init (&username))
818 if (!_dbus_append_user_from_current_process (&username))
821 if (!_dbus_string_hex_encode (&username, 0,
823 _dbus_string_get_length (response)))
829 _dbus_string_free (&username);
835 handle_client_data_cookie_sha1_mech (DBusAuth *auth,
836 const DBusString *data)
838 /* The data we get from the server should be the cookie context
839 * name, the cookie ID, and the server challenge, separated by
840 * spaces. We send back our challenge string and the correct hash.
842 dbus_bool_t retval = FALSE;
844 DBusString cookie_id_str;
845 DBusString server_challenge;
846 DBusString client_challenge;
847 DBusString correct_hash;
851 DBusError error = DBUS_ERROR_INIT;
853 if (!_dbus_string_find_blank (data, 0, &i))
855 if (send_error (auth,
856 "Server did not send context/ID/challenge properly"))
861 if (!_dbus_string_init (&context))
864 if (!_dbus_string_copy_len (data, 0, i,
868 _dbus_string_skip_blank (data, i, &i);
869 if (!_dbus_string_find_blank (data, i, &j))
871 if (send_error (auth,
872 "Server did not send context/ID/challenge properly"))
877 if (!_dbus_string_init (&cookie_id_str))
880 if (!_dbus_string_copy_len (data, i, j - i,
884 if (!_dbus_string_init (&server_challenge))
888 _dbus_string_skip_blank (data, i, &i);
889 j = _dbus_string_get_length (data);
891 if (!_dbus_string_copy_len (data, i, j - i,
892 &server_challenge, 0))
895 if (!_dbus_keyring_validate_context (&context))
897 if (send_error (auth, "Server sent invalid cookie context"))
902 if (!_dbus_string_parse_int (&cookie_id_str, 0, &val, NULL))
904 if (send_error (auth, "Could not parse cookie ID as an integer"))
909 if (_dbus_string_get_length (&server_challenge) == 0)
911 if (send_error (auth, "Empty server challenge string"))
916 if (auth->keyring == NULL)
918 auth->keyring = _dbus_keyring_new_for_credentials (NULL,
922 if (auth->keyring == NULL)
924 if (dbus_error_has_name (&error,
925 DBUS_ERROR_NO_MEMORY))
927 dbus_error_free (&error);
932 _DBUS_ASSERT_ERROR_IS_SET (&error);
934 _dbus_verbose ("%s: Error loading keyring: %s\n",
935 DBUS_AUTH_NAME (auth), error.message);
937 if (send_error (auth, "Could not load cookie file"))
938 retval = TRUE; /* retval is only about mem */
940 dbus_error_free (&error);
946 _dbus_assert (!dbus_error_is_set (&error));
950 _dbus_assert (auth->keyring != NULL);
952 if (!_dbus_string_init (&tmp))
955 if (!_dbus_generate_random_bytes (&tmp, N_CHALLENGE_BYTES, &error))
957 if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY))
959 dbus_error_free (&error);
964 _DBUS_ASSERT_ERROR_IS_SET (&error);
966 _dbus_verbose ("%s: Failed to generate challenge: %s\n",
967 DBUS_AUTH_NAME (auth), error.message);
969 if (send_error (auth, "Failed to generate challenge"))
970 retval = TRUE; /* retval is only about mem */
972 dbus_error_free (&error);
977 if (!_dbus_string_init (&client_challenge))
980 if (!_dbus_string_hex_encode (&tmp, 0, &client_challenge, 0))
983 if (!_dbus_string_init (&correct_hash))
986 if (!sha1_compute_hash (auth, val,
992 if (_dbus_string_get_length (&correct_hash) == 0)
994 /* couldn't find the cookie ID or something */
995 if (send_error (auth, "Don't have the requested cookie ID"))
1000 _dbus_string_set_length (&tmp, 0);
1002 if (!_dbus_string_copy (&client_challenge, 0, &tmp,
1003 _dbus_string_get_length (&tmp)))
1006 if (!_dbus_string_append (&tmp, " "))
1009 if (!_dbus_string_copy (&correct_hash, 0, &tmp,
1010 _dbus_string_get_length (&tmp)))
1013 if (!send_data (auth, &tmp))
1019 _dbus_string_zero (&correct_hash);
1020 _dbus_string_free (&correct_hash);
1022 _dbus_string_free (&client_challenge);
1024 _dbus_string_zero (&tmp);
1025 _dbus_string_free (&tmp);
1027 _dbus_string_free (&server_challenge);
1029 _dbus_string_free (&cookie_id_str);
1031 _dbus_string_free (&context);
1037 handle_client_shutdown_cookie_sha1_mech (DBusAuth *auth)
1039 auth->cookie_id = -1;
1040 _dbus_string_set_length (&auth->challenge, 0);
1044 * EXTERNAL mechanism
1048 handle_server_data_external_mech (DBusAuth *auth,
1049 const DBusString *data)
1051 if (_dbus_credentials_are_anonymous (auth->credentials))
1053 _dbus_verbose ("%s: no credentials, mechanism EXTERNAL can't authenticate\n",
1054 DBUS_AUTH_NAME (auth));
1055 return send_rejected (auth);
1058 if (_dbus_string_get_length (data) > 0)
1060 if (_dbus_string_get_length (&auth->identity) > 0)
1062 /* Tried to send two auth identities, wtf */
1063 _dbus_verbose ("%s: client tried to send auth identity, but we already have one\n",
1064 DBUS_AUTH_NAME (auth));
1065 return send_rejected (auth);
1069 /* this is our auth identity */
1070 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
1075 /* Poke client for an auth identity, if none given */
1076 if (_dbus_string_get_length (&auth->identity) == 0 &&
1077 !auth->already_asked_for_initial_response)
1079 if (send_data (auth, NULL))
1081 _dbus_verbose ("%s: sending empty challenge asking client for auth identity\n",
1082 DBUS_AUTH_NAME (auth));
1083 auth->already_asked_for_initial_response = TRUE;
1084 goto_state (auth, &server_state_waiting_for_data);
1091 _dbus_credentials_clear (auth->desired_identity);
1093 /* If auth->identity is still empty here, then client
1094 * responded with an empty string after we poked it for
1095 * an initial response. This means to try to auth the
1096 * identity provided in the credentials.
1098 if (_dbus_string_get_length (&auth->identity) == 0)
1100 if (!_dbus_credentials_add_credentials (auth->desired_identity,
1103 return FALSE; /* OOM */
1108 if (!_dbus_credentials_add_from_user (auth->desired_identity,
1111 _dbus_verbose ("%s: could not get credentials from uid string\n",
1112 DBUS_AUTH_NAME (auth));
1113 return send_rejected (auth);
1117 if (_dbus_credentials_are_anonymous (auth->desired_identity))
1119 _dbus_verbose ("%s: desired user %s is no good\n",
1120 DBUS_AUTH_NAME (auth),
1121 _dbus_string_get_const_data (&auth->identity));
1122 return send_rejected (auth);
1125 if (_dbus_credentials_are_superset (auth->credentials,
1126 auth->desired_identity))
1128 /* client has authenticated */
1129 if (!_dbus_credentials_add_credentials (auth->authorized_identity,
1130 auth->desired_identity))
1133 /* also copy misc process info from the socket credentials
1135 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1136 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1140 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1141 DBUS_CREDENTIAL_ADT_AUDIT_DATA_ID,
1145 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1146 DBUS_CREDENTIAL_LINUX_SECURITY_LABEL,
1150 if (!send_ok (auth))
1153 _dbus_verbose ("%s: authenticated client based on socket credentials\n",
1154 DBUS_AUTH_NAME (auth));
1160 _dbus_verbose ("%s: desired identity not found in socket credentials\n",
1161 DBUS_AUTH_NAME (auth));
1162 return send_rejected (auth);
1167 handle_server_shutdown_external_mech (DBusAuth *auth)
1173 handle_client_initial_response_external_mech (DBusAuth *auth,
1174 DBusString *response)
1176 /* We always append our UID as an initial response, so the server
1177 * doesn't have to send back an empty challenge to check whether we
1178 * want to specify an identity. i.e. this avoids a round trip that
1179 * the spec for the EXTERNAL mechanism otherwise requires.
1181 DBusString plaintext;
1183 if (!_dbus_string_init (&plaintext))
1186 if (!_dbus_append_user_from_current_process (&plaintext))
1189 if (!_dbus_string_hex_encode (&plaintext, 0,
1191 _dbus_string_get_length (response)))
1194 _dbus_string_free (&plaintext);
1199 _dbus_string_free (&plaintext);
1204 handle_client_data_external_mech (DBusAuth *auth,
1205 const DBusString *data)
1212 handle_client_shutdown_external_mech (DBusAuth *auth)
1218 * ANONYMOUS mechanism
1222 handle_server_data_anonymous_mech (DBusAuth *auth,
1223 const DBusString *data)
1225 if (_dbus_string_get_length (data) > 0)
1227 /* Client is allowed to send "trace" data, the only defined
1228 * meaning is that if it contains '@' it is an email address,
1229 * and otherwise it is anything else, and it's supposed to be
1232 if (!_dbus_string_validate_utf8 (data, 0, _dbus_string_get_length (data)))
1234 _dbus_verbose ("%s: Received invalid UTF-8 trace data from ANONYMOUS client\n",
1235 DBUS_AUTH_NAME (auth));
1236 return send_rejected (auth);
1239 _dbus_verbose ("%s: ANONYMOUS client sent trace string: '%s'\n",
1240 DBUS_AUTH_NAME (auth),
1241 _dbus_string_get_const_data (data));
1244 /* We want to be anonymous (clear in case some other protocol got midway through I guess) */
1245 _dbus_credentials_clear (auth->desired_identity);
1247 /* Copy process ID from the socket credentials
1249 if (!_dbus_credentials_add_credential (auth->authorized_identity,
1250 DBUS_CREDENTIAL_UNIX_PROCESS_ID,
1254 /* Anonymous is always allowed */
1255 if (!send_ok (auth))
1258 _dbus_verbose ("%s: authenticated client as anonymous\n",
1259 DBUS_AUTH_NAME (auth));
1265 handle_server_shutdown_anonymous_mech (DBusAuth *auth)
1271 handle_client_initial_response_anonymous_mech (DBusAuth *auth,
1272 DBusString *response)
1274 /* Our initial response is a "trace" string which must be valid UTF-8
1275 * and must be an email address if it contains '@'.
1276 * We just send the dbus implementation info, like a user-agent or
1277 * something, because... why not. There's nothing guaranteed here
1278 * though, we could change it later.
1280 DBusString plaintext;
1282 if (!_dbus_string_init (&plaintext))
1285 if (!_dbus_string_append (&plaintext,
1286 "libdbus " DBUS_VERSION_STRING))
1289 if (!_dbus_string_hex_encode (&plaintext, 0,
1291 _dbus_string_get_length (response)))
1294 _dbus_string_free (&plaintext);
1299 _dbus_string_free (&plaintext);
1304 handle_client_data_anonymous_mech (DBusAuth *auth,
1305 const DBusString *data)
1312 handle_client_shutdown_anonymous_mech (DBusAuth *auth)
1317 /* Put mechanisms here in order of preference.
1318 * Right now we have:
1320 * - EXTERNAL checks socket credentials (or in the future, other info from the OS)
1321 * - DBUS_COOKIE_SHA1 uses a cookie in the home directory, like xauth or ICE
1322 * - ANONYMOUS checks nothing but doesn't auth the person as a user
1324 * We might ideally add a mechanism to chain to Cyrus SASL so we can
1325 * use its mechanisms as well.
1328 static const DBusAuthMechanismHandler
1329 all_mechanisms[] = {
1331 handle_server_data_external_mech,
1333 handle_server_shutdown_external_mech,
1334 handle_client_initial_response_external_mech,
1335 handle_client_data_external_mech,
1337 handle_client_shutdown_external_mech },
1338 { "DBUS_COOKIE_SHA1",
1339 handle_server_data_cookie_sha1_mech,
1341 handle_server_shutdown_cookie_sha1_mech,
1342 handle_client_initial_response_cookie_sha1_mech,
1343 handle_client_data_cookie_sha1_mech,
1345 handle_client_shutdown_cookie_sha1_mech },
1347 handle_server_data_anonymous_mech,
1349 handle_server_shutdown_anonymous_mech,
1350 handle_client_initial_response_anonymous_mech,
1351 handle_client_data_anonymous_mech,
1353 handle_client_shutdown_anonymous_mech },
1357 static const DBusAuthMechanismHandler*
1358 find_mech (const DBusString *name,
1359 char **allowed_mechs)
1363 if (allowed_mechs != NULL &&
1364 !_dbus_string_array_contains ((const char**) allowed_mechs,
1365 _dbus_string_get_const_data (name)))
1369 while (all_mechanisms[i].mechanism != NULL)
1371 if (_dbus_string_equal_c_str (name,
1372 all_mechanisms[i].mechanism))
1374 return &all_mechanisms[i];
1383 send_auth (DBusAuth *auth, const DBusAuthMechanismHandler *mech)
1385 DBusString auth_command;
1387 if (!_dbus_string_init (&auth_command))
1390 if (!_dbus_string_append (&auth_command,
1393 _dbus_string_free (&auth_command);
1397 if (!_dbus_string_append (&auth_command,
1400 _dbus_string_free (&auth_command);
1404 if (mech->client_initial_response_func != NULL)
1406 if (!_dbus_string_append (&auth_command, " "))
1408 _dbus_string_free (&auth_command);
1412 if (!(* mech->client_initial_response_func) (auth, &auth_command))
1414 _dbus_string_free (&auth_command);
1419 if (!_dbus_string_append (&auth_command,
1422 _dbus_string_free (&auth_command);
1426 if (!_dbus_string_copy (&auth_command, 0,
1428 _dbus_string_get_length (&auth->outgoing)))
1430 _dbus_string_free (&auth_command);
1434 _dbus_string_free (&auth_command);
1435 shutdown_mech (auth);
1437 goto_state (auth, &client_state_waiting_for_data);
1443 send_data (DBusAuth *auth, DBusString *data)
1447 if (data == NULL || _dbus_string_get_length (data) == 0)
1448 return _dbus_string_append (&auth->outgoing, "DATA\r\n");
1451 old_len = _dbus_string_get_length (&auth->outgoing);
1452 if (!_dbus_string_append (&auth->outgoing, "DATA "))
1455 if (!_dbus_string_hex_encode (data, 0, &auth->outgoing,
1456 _dbus_string_get_length (&auth->outgoing)))
1459 if (!_dbus_string_append (&auth->outgoing, "\r\n"))
1465 _dbus_string_set_length (&auth->outgoing, old_len);
1472 send_rejected (DBusAuth *auth)
1475 DBusAuthServer *server_auth;
1478 if (!_dbus_string_init (&command))
1481 if (!_dbus_string_append (&command,
1486 while (all_mechanisms[i].mechanism != NULL)
1488 if (!_dbus_string_append (&command,
1492 if (!_dbus_string_append (&command,
1493 all_mechanisms[i].mechanism))
1499 if (!_dbus_string_append (&command, "\r\n"))
1502 if (!_dbus_string_copy (&command, 0, &auth->outgoing,
1503 _dbus_string_get_length (&auth->outgoing)))
1506 shutdown_mech (auth);
1508 _dbus_assert (DBUS_AUTH_IS_SERVER (auth));
1509 server_auth = DBUS_AUTH_SERVER (auth);
1510 server_auth->failures += 1;
1512 if (server_auth->failures >= server_auth->max_failures)
1513 goto_state (auth, &common_state_need_disconnect);
1515 goto_state (auth, &server_state_waiting_for_auth);
1517 _dbus_string_free (&command);
1522 _dbus_string_free (&command);
1527 send_error (DBusAuth *auth, const char *message)
1529 return _dbus_string_append_printf (&auth->outgoing,
1530 "ERROR \"%s\"\r\n", message);
1534 send_ok (DBusAuth *auth)
1538 orig_len = _dbus_string_get_length (&auth->outgoing);
1540 if (_dbus_string_append (&auth->outgoing, "OK ") &&
1541 _dbus_string_copy (& DBUS_AUTH_SERVER (auth)->guid,
1544 _dbus_string_get_length (&auth->outgoing)) &&
1545 _dbus_string_append (&auth->outgoing, "\r\n"))
1547 goto_state (auth, &server_state_waiting_for_begin);
1552 _dbus_string_set_length (&auth->outgoing, orig_len);
1558 send_begin (DBusAuth *auth)
1561 if (!_dbus_string_append (&auth->outgoing,
1565 goto_state (auth, &common_state_authenticated);
1570 process_ok(DBusAuth *auth,
1571 const DBusString *args_from_ok) {
1575 /* "args_from_ok" should be the GUID, whitespace already pulled off the front */
1576 _dbus_assert (_dbus_string_get_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server) == 0);
1578 /* We decode the hex string to binary, using guid_from_server as scratch... */
1581 if (!_dbus_string_hex_decode (args_from_ok, 0, &end_of_hex,
1582 & DBUS_AUTH_CLIENT (auth)->guid_from_server, 0))
1585 /* now clear out the scratch */
1586 _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1588 if (end_of_hex != _dbus_string_get_length (args_from_ok) ||
1591 _dbus_verbose ("Bad GUID from server, parsed %d bytes and had %d bytes from server\n",
1592 end_of_hex, _dbus_string_get_length (args_from_ok));
1593 goto_state (auth, &common_state_need_disconnect);
1597 if (!_dbus_string_copy (args_from_ok, 0, &DBUS_AUTH_CLIENT (auth)->guid_from_server, 0)) {
1598 _dbus_string_set_length (& DBUS_AUTH_CLIENT (auth)->guid_from_server, 0);
1602 _dbus_verbose ("Got GUID '%s' from the server\n",
1603 _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server));
1605 if (auth->unix_fd_possible)
1606 return send_negotiate_unix_fd(auth);
1608 _dbus_verbose("Not negotiating unix fd passing, since not possible\n");
1609 return send_begin (auth);
1613 send_cancel (DBusAuth *auth)
1615 if (_dbus_string_append (&auth->outgoing, "CANCEL\r\n"))
1617 goto_state (auth, &client_state_waiting_for_reject);
1625 process_data (DBusAuth *auth,
1626 const DBusString *args,
1627 DBusAuthDataFunction data_func)
1632 if (!_dbus_string_init (&decoded))
1635 if (!_dbus_string_hex_decode (args, 0, &end, &decoded, 0))
1637 _dbus_string_free (&decoded);
1641 if (_dbus_string_get_length (args) != end)
1643 _dbus_string_free (&decoded);
1644 if (!send_error (auth, "Invalid hex encoding"))
1650 #ifdef DBUS_ENABLE_VERBOSE_MODE
1651 if (_dbus_string_validate_ascii (&decoded, 0,
1652 _dbus_string_get_length (&decoded)))
1653 _dbus_verbose ("%s: data: '%s'\n",
1654 DBUS_AUTH_NAME (auth),
1655 _dbus_string_get_const_data (&decoded));
1658 if (!(* data_func) (auth, &decoded))
1660 _dbus_string_free (&decoded);
1664 _dbus_string_free (&decoded);
1669 send_negotiate_unix_fd (DBusAuth *auth)
1671 if (!_dbus_string_append (&auth->outgoing,
1672 "NEGOTIATE_UNIX_FD\r\n"))
1675 goto_state (auth, &client_state_waiting_for_agree_unix_fd);
1680 send_agree_unix_fd (DBusAuth *auth)
1682 _dbus_assert(auth->unix_fd_possible);
1684 auth->unix_fd_negotiated = TRUE;
1685 _dbus_verbose("Agreed to UNIX FD passing\n");
1687 if (!_dbus_string_append (&auth->outgoing,
1688 "AGREE_UNIX_FD\r\n"))
1691 goto_state (auth, &server_state_waiting_for_begin);
1696 handle_auth (DBusAuth *auth, const DBusString *args)
1698 if (_dbus_string_get_length (args) == 0)
1700 /* No args to the auth, send mechanisms */
1701 if (!send_rejected (auth))
1710 DBusString hex_response;
1712 _dbus_string_find_blank (args, 0, &i);
1714 if (!_dbus_string_init (&mech))
1717 if (!_dbus_string_init (&hex_response))
1719 _dbus_string_free (&mech);
1723 if (!_dbus_string_copy_len (args, 0, i, &mech, 0))
1726 _dbus_string_skip_blank (args, i, &i);
1727 if (!_dbus_string_copy (args, i, &hex_response, 0))
1730 auth->mech = find_mech (&mech, auth->allowed_mechs);
1731 if (auth->mech != NULL)
1733 _dbus_verbose ("%s: Trying mechanism %s\n",
1734 DBUS_AUTH_NAME (auth),
1735 auth->mech->mechanism);
1737 if (!process_data (auth, &hex_response,
1738 auth->mech->server_data_func))
1743 /* Unsupported mechanism */
1744 _dbus_verbose ("%s: Unsupported mechanism %s\n",
1745 DBUS_AUTH_NAME (auth),
1746 _dbus_string_get_const_data (&mech));
1748 if (!send_rejected (auth))
1752 _dbus_string_free (&mech);
1753 _dbus_string_free (&hex_response);
1759 _dbus_string_free (&mech);
1760 _dbus_string_free (&hex_response);
1766 handle_server_state_waiting_for_auth (DBusAuth *auth,
1767 DBusAuthCommand command,
1768 const DBusString *args)
1772 case DBUS_AUTH_COMMAND_AUTH:
1773 return handle_auth (auth, args);
1775 case DBUS_AUTH_COMMAND_CANCEL:
1776 case DBUS_AUTH_COMMAND_DATA:
1777 return send_error (auth, "Not currently in an auth conversation");
1779 case DBUS_AUTH_COMMAND_BEGIN:
1780 goto_state (auth, &common_state_need_disconnect);
1783 case DBUS_AUTH_COMMAND_ERROR:
1784 return send_rejected (auth);
1786 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1787 return send_error (auth, "Need to authenticate first");
1789 case DBUS_AUTH_COMMAND_REJECTED:
1790 case DBUS_AUTH_COMMAND_OK:
1791 case DBUS_AUTH_COMMAND_UNKNOWN:
1792 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1794 return send_error (auth, "Unknown command");
1799 handle_server_state_waiting_for_data (DBusAuth *auth,
1800 DBusAuthCommand command,
1801 const DBusString *args)
1805 case DBUS_AUTH_COMMAND_AUTH:
1806 return send_error (auth, "Sent AUTH while another AUTH in progress");
1808 case DBUS_AUTH_COMMAND_CANCEL:
1809 case DBUS_AUTH_COMMAND_ERROR:
1810 return send_rejected (auth);
1812 case DBUS_AUTH_COMMAND_DATA:
1813 return process_data (auth, args, auth->mech->server_data_func);
1815 case DBUS_AUTH_COMMAND_BEGIN:
1816 goto_state (auth, &common_state_need_disconnect);
1819 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1820 return send_error (auth, "Need to authenticate first");
1822 case DBUS_AUTH_COMMAND_REJECTED:
1823 case DBUS_AUTH_COMMAND_OK:
1824 case DBUS_AUTH_COMMAND_UNKNOWN:
1825 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1827 return send_error (auth, "Unknown command");
1832 handle_server_state_waiting_for_begin (DBusAuth *auth,
1833 DBusAuthCommand command,
1834 const DBusString *args)
1838 case DBUS_AUTH_COMMAND_AUTH:
1839 return send_error (auth, "Sent AUTH while expecting BEGIN");
1841 case DBUS_AUTH_COMMAND_DATA:
1842 return send_error (auth, "Sent DATA while expecting BEGIN");
1844 case DBUS_AUTH_COMMAND_BEGIN:
1845 goto_state (auth, &common_state_authenticated);
1848 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
1849 if (auth->unix_fd_possible)
1850 return send_agree_unix_fd(auth);
1852 return send_error(auth, "Unix FD passing not supported, not authenticated or otherwise not possible");
1854 case DBUS_AUTH_COMMAND_REJECTED:
1855 case DBUS_AUTH_COMMAND_OK:
1856 case DBUS_AUTH_COMMAND_UNKNOWN:
1857 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
1859 return send_error (auth, "Unknown command");
1861 case DBUS_AUTH_COMMAND_CANCEL:
1862 case DBUS_AUTH_COMMAND_ERROR:
1863 return send_rejected (auth);
1867 /* return FALSE if no memory, TRUE if all OK */
1869 get_word (const DBusString *str,
1875 _dbus_string_skip_blank (str, *start, start);
1876 _dbus_string_find_blank (str, *start, &i);
1880 if (!_dbus_string_copy_len (str, *start, i - *start, word, 0))
1890 record_mechanisms (DBusAuth *auth,
1891 const DBusString *args)
1896 if (auth->already_got_mechanisms)
1899 len = _dbus_string_get_length (args);
1905 const DBusAuthMechanismHandler *mech;
1907 if (!_dbus_string_init (&m))
1910 if (!get_word (args, &next, &m))
1912 _dbus_string_free (&m);
1916 mech = find_mech (&m, auth->allowed_mechs);
1920 /* FIXME right now we try mechanisms in the order
1921 * the server lists them; should we do them in
1922 * some more deterministic order?
1924 * Probably in all_mechanisms order, our order of
1925 * preference. Of course when the server is us,
1926 * it lists things in that order anyhow.
1929 if (mech != &all_mechanisms[0])
1931 _dbus_verbose ("%s: Adding mechanism %s to list we will try\n",
1932 DBUS_AUTH_NAME (auth), mech->mechanism);
1934 if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
1937 _dbus_string_free (&m);
1943 _dbus_verbose ("%s: Already tried mechanism %s; not adding to list we will try\n",
1944 DBUS_AUTH_NAME (auth), mech->mechanism);
1949 _dbus_verbose ("%s: Server offered mechanism \"%s\" that we don't know how to use\n",
1950 DBUS_AUTH_NAME (auth),
1951 _dbus_string_get_const_data (&m));
1954 _dbus_string_free (&m);
1957 auth->already_got_mechanisms = TRUE;
1962 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
1968 process_rejected (DBusAuth *auth, const DBusString *args)
1970 const DBusAuthMechanismHandler *mech;
1971 DBusAuthClient *client;
1973 client = DBUS_AUTH_CLIENT (auth);
1975 if (!auth->already_got_mechanisms)
1977 if (!record_mechanisms (auth, args))
1981 if (DBUS_AUTH_CLIENT (auth)->mechs_to_try != NULL)
1983 mech = client->mechs_to_try->data;
1985 if (!send_auth (auth, mech))
1988 _dbus_list_pop_first (&client->mechs_to_try);
1990 _dbus_verbose ("%s: Trying mechanism %s\n",
1991 DBUS_AUTH_NAME (auth),
1997 _dbus_verbose ("%s: Disconnecting because we are out of mechanisms to try using\n",
1998 DBUS_AUTH_NAME (auth));
1999 goto_state (auth, &common_state_need_disconnect);
2007 handle_client_state_waiting_for_data (DBusAuth *auth,
2008 DBusAuthCommand command,
2009 const DBusString *args)
2011 _dbus_assert (auth->mech != NULL);
2015 case DBUS_AUTH_COMMAND_DATA:
2016 return process_data (auth, args, auth->mech->client_data_func);
2018 case DBUS_AUTH_COMMAND_REJECTED:
2019 return process_rejected (auth, args);
2021 case DBUS_AUTH_COMMAND_OK:
2022 return process_ok(auth, args);
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_ok (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_OK:
2049 return process_ok(auth, args);
2051 case DBUS_AUTH_COMMAND_DATA:
2052 case DBUS_AUTH_COMMAND_ERROR:
2053 return send_cancel (auth);
2055 case DBUS_AUTH_COMMAND_AUTH:
2056 case DBUS_AUTH_COMMAND_CANCEL:
2057 case DBUS_AUTH_COMMAND_BEGIN:
2058 case DBUS_AUTH_COMMAND_UNKNOWN:
2059 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2060 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2062 return send_error (auth, "Unknown command");
2067 handle_client_state_waiting_for_reject (DBusAuth *auth,
2068 DBusAuthCommand command,
2069 const DBusString *args)
2073 case DBUS_AUTH_COMMAND_REJECTED:
2074 return process_rejected (auth, args);
2076 case DBUS_AUTH_COMMAND_AUTH:
2077 case DBUS_AUTH_COMMAND_CANCEL:
2078 case DBUS_AUTH_COMMAND_DATA:
2079 case DBUS_AUTH_COMMAND_BEGIN:
2080 case DBUS_AUTH_COMMAND_OK:
2081 case DBUS_AUTH_COMMAND_ERROR:
2082 case DBUS_AUTH_COMMAND_UNKNOWN:
2083 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2084 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2086 goto_state (auth, &common_state_need_disconnect);
2092 handle_client_state_waiting_for_agree_unix_fd(DBusAuth *auth,
2093 DBusAuthCommand command,
2094 const DBusString *args)
2098 case DBUS_AUTH_COMMAND_AGREE_UNIX_FD:
2099 _dbus_assert(auth->unix_fd_possible);
2100 auth->unix_fd_negotiated = TRUE;
2101 _dbus_verbose("Successfully negotiated UNIX FD passing\n");
2102 return send_begin (auth);
2104 case DBUS_AUTH_COMMAND_ERROR:
2105 _dbus_assert(auth->unix_fd_possible);
2106 auth->unix_fd_negotiated = FALSE;
2107 _dbus_verbose("Failed to negotiate UNIX FD passing\n");
2108 return send_begin (auth);
2110 case DBUS_AUTH_COMMAND_OK:
2111 case DBUS_AUTH_COMMAND_DATA:
2112 case DBUS_AUTH_COMMAND_REJECTED:
2113 case DBUS_AUTH_COMMAND_AUTH:
2114 case DBUS_AUTH_COMMAND_CANCEL:
2115 case DBUS_AUTH_COMMAND_BEGIN:
2116 case DBUS_AUTH_COMMAND_UNKNOWN:
2117 case DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD:
2119 return send_error (auth, "Unknown command");
2124 * Mapping from command name to enum
2127 const char *name; /**< Name of the command */
2128 DBusAuthCommand command; /**< Corresponding enum */
2129 } DBusAuthCommandName;
2131 static const DBusAuthCommandName auth_command_names[] = {
2132 { "AUTH", DBUS_AUTH_COMMAND_AUTH },
2133 { "CANCEL", DBUS_AUTH_COMMAND_CANCEL },
2134 { "DATA", DBUS_AUTH_COMMAND_DATA },
2135 { "BEGIN", DBUS_AUTH_COMMAND_BEGIN },
2136 { "REJECTED", DBUS_AUTH_COMMAND_REJECTED },
2137 { "OK", DBUS_AUTH_COMMAND_OK },
2138 { "ERROR", DBUS_AUTH_COMMAND_ERROR },
2139 { "NEGOTIATE_UNIX_FD", DBUS_AUTH_COMMAND_NEGOTIATE_UNIX_FD },
2140 { "AGREE_UNIX_FD", DBUS_AUTH_COMMAND_AGREE_UNIX_FD }
2143 static DBusAuthCommand
2144 lookup_command_from_name (DBusString *command)
2148 for (i = 0; i < _DBUS_N_ELEMENTS (auth_command_names); i++)
2150 if (_dbus_string_equal_c_str (command,
2151 auth_command_names[i].name))
2152 return auth_command_names[i].command;
2155 return DBUS_AUTH_COMMAND_UNKNOWN;
2159 goto_state (DBusAuth *auth,
2160 const DBusAuthStateData *state)
2162 _dbus_verbose ("%s: going from state %s to state %s\n",
2163 DBUS_AUTH_NAME (auth),
2167 auth->state = state;
2170 /* returns whether to call it again right away */
2172 process_command (DBusAuth *auth)
2174 DBusAuthCommand command;
2181 /* _dbus_verbose ("%s: trying process_command()\n"); */
2186 if (!_dbus_string_find (&auth->incoming, 0, "\r\n", &eol))
2189 if (!_dbus_string_init (&line))
2191 auth->needed_memory = TRUE;
2195 if (!_dbus_string_init (&args))
2197 _dbus_string_free (&line);
2198 auth->needed_memory = TRUE;
2202 if (!_dbus_string_copy_len (&auth->incoming, 0, eol, &line, 0))
2205 if (!_dbus_string_validate_ascii (&line, 0,
2206 _dbus_string_get_length (&line)))
2208 _dbus_verbose ("%s: Command contained non-ASCII chars or embedded nul\n",
2209 DBUS_AUTH_NAME (auth));
2210 if (!send_error (auth, "Command contained non-ASCII"))
2216 _dbus_verbose ("%s: got command \"%s\"\n",
2217 DBUS_AUTH_NAME (auth),
2218 _dbus_string_get_const_data (&line));
2220 _dbus_string_find_blank (&line, 0, &i);
2221 _dbus_string_skip_blank (&line, i, &j);
2224 _dbus_string_delete (&line, i, j - i);
2226 if (!_dbus_string_move (&line, i, &args, 0))
2229 /* FIXME 1.0 we should probably validate that only the allowed
2230 * chars are in the command name
2233 command = lookup_command_from_name (&line);
2234 if (!(* auth->state->handler) (auth, command, &args))
2239 /* We've succeeded in processing the whole command so drop it out
2240 * of the incoming buffer and return TRUE to try another command.
2243 _dbus_string_delete (&auth->incoming, 0, eol);
2246 _dbus_string_delete (&auth->incoming, 0, 2);
2251 _dbus_string_free (&args);
2252 _dbus_string_free (&line);
2255 auth->needed_memory = TRUE;
2257 auth->needed_memory = FALSE;
2266 * @addtogroup DBusAuth
2271 * Creates a new auth conversation object for the server side.
2272 * See http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
2273 * for full details on what this object does.
2275 * @returns the new object or #NULL if no memory
2278 _dbus_auth_server_new (const DBusString *guid)
2281 DBusAuthServer *server_auth;
2282 DBusString guid_copy;
2284 if (!_dbus_string_init (&guid_copy))
2287 if (!_dbus_string_copy (guid, 0, &guid_copy, 0))
2289 _dbus_string_free (&guid_copy);
2293 auth = _dbus_auth_new (sizeof (DBusAuthServer));
2296 _dbus_string_free (&guid_copy);
2300 auth->side = auth_side_server;
2301 auth->state = &server_state_waiting_for_auth;
2303 server_auth = DBUS_AUTH_SERVER (auth);
2305 server_auth->guid = guid_copy;
2307 /* perhaps this should be per-mechanism with a lower
2310 server_auth->failures = 0;
2311 server_auth->max_failures = 6;
2317 * Creates a new auth conversation object for the client side.
2318 * See http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
2319 * for full details on what this object does.
2321 * @returns the new object or #NULL if no memory
2324 _dbus_auth_client_new (void)
2327 DBusString guid_str;
2329 if (!_dbus_string_init (&guid_str))
2332 auth = _dbus_auth_new (sizeof (DBusAuthClient));
2335 _dbus_string_free (&guid_str);
2339 DBUS_AUTH_CLIENT (auth)->guid_from_server = guid_str;
2341 auth->side = auth_side_client;
2342 auth->state = &client_state_need_send_auth;
2344 /* Start the auth conversation by sending AUTH for our default
2346 if (!send_auth (auth, &all_mechanisms[0]))
2348 _dbus_auth_unref (auth);
2356 * Increments the refcount of an auth object.
2358 * @param auth the auth conversation
2359 * @returns the auth conversation
2362 _dbus_auth_ref (DBusAuth *auth)
2364 _dbus_assert (auth != NULL);
2366 auth->refcount += 1;
2372 * Decrements the refcount of an auth object.
2374 * @param auth the auth conversation
2377 _dbus_auth_unref (DBusAuth *auth)
2379 _dbus_assert (auth != NULL);
2380 _dbus_assert (auth->refcount > 0);
2382 auth->refcount -= 1;
2383 if (auth->refcount == 0)
2385 shutdown_mech (auth);
2387 if (DBUS_AUTH_IS_CLIENT (auth))
2389 _dbus_string_free (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2390 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
2394 _dbus_assert (DBUS_AUTH_IS_SERVER (auth));
2396 _dbus_string_free (& DBUS_AUTH_SERVER (auth)->guid);
2400 _dbus_keyring_unref (auth->keyring);
2402 _dbus_string_free (&auth->context);
2403 _dbus_string_free (&auth->challenge);
2404 _dbus_string_free (&auth->identity);
2405 _dbus_string_free (&auth->incoming);
2406 _dbus_string_free (&auth->outgoing);
2408 dbus_free_string_array (auth->allowed_mechs);
2410 _dbus_credentials_unref (auth->credentials);
2411 _dbus_credentials_unref (auth->authorized_identity);
2412 _dbus_credentials_unref (auth->desired_identity);
2419 * Sets an array of authentication mechanism names
2420 * that we are willing to use.
2422 * @param auth the auth conversation
2423 * @param mechanisms #NULL-terminated array of mechanism names
2424 * @returns #FALSE if no memory
2427 _dbus_auth_set_mechanisms (DBusAuth *auth,
2428 const char **mechanisms)
2432 if (mechanisms != NULL)
2434 copy = _dbus_dup_string_array (mechanisms);
2441 dbus_free_string_array (auth->allowed_mechs);
2443 auth->allowed_mechs = copy;
2449 * @param auth the auth conversation object
2450 * @returns #TRUE if we're in a final state
2452 #define DBUS_AUTH_IN_END_STATE(auth) ((auth)->state->handler == NULL)
2455 * Analyzes buffered input and moves the auth conversation forward,
2456 * returning the new state of the auth conversation.
2458 * @param auth the auth conversation
2459 * @returns the new state
2462 _dbus_auth_do_work (DBusAuth *auth)
2464 auth->needed_memory = FALSE;
2466 /* Max amount we'll buffer up before deciding someone's on crack */
2467 #define MAX_BUFFER (16 * _DBUS_ONE_KILOBYTE)
2471 if (DBUS_AUTH_IN_END_STATE (auth))
2474 if (_dbus_string_get_length (&auth->incoming) > MAX_BUFFER ||
2475 _dbus_string_get_length (&auth->outgoing) > MAX_BUFFER)
2477 goto_state (auth, &common_state_need_disconnect);
2478 _dbus_verbose ("%s: Disconnecting due to excessive data buffered in auth phase\n",
2479 DBUS_AUTH_NAME (auth));
2483 while (process_command (auth));
2485 if (auth->needed_memory)
2486 return DBUS_AUTH_STATE_WAITING_FOR_MEMORY;
2487 else if (_dbus_string_get_length (&auth->outgoing) > 0)
2488 return DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND;
2489 else if (auth->state == &common_state_need_disconnect)
2490 return DBUS_AUTH_STATE_NEED_DISCONNECT;
2491 else if (auth->state == &common_state_authenticated)
2492 return DBUS_AUTH_STATE_AUTHENTICATED;
2493 else return DBUS_AUTH_STATE_WAITING_FOR_INPUT;
2497 * Gets bytes that need to be sent to the peer we're conversing with.
2498 * After writing some bytes, _dbus_auth_bytes_sent() must be called
2499 * to notify the auth object that they were written.
2501 * @param auth the auth conversation
2502 * @param str return location for a ref to the buffer to send
2503 * @returns #FALSE if nothing to send
2506 _dbus_auth_get_bytes_to_send (DBusAuth *auth,
2507 const DBusString **str)
2509 _dbus_assert (auth != NULL);
2510 _dbus_assert (str != NULL);
2514 if (_dbus_string_get_length (&auth->outgoing) == 0)
2517 *str = &auth->outgoing;
2523 * Notifies the auth conversation object that
2524 * the given number of bytes of the outgoing buffer
2525 * have been written out.
2527 * @param auth the auth conversation
2528 * @param bytes_sent number of bytes written out
2531 _dbus_auth_bytes_sent (DBusAuth *auth,
2534 _dbus_verbose ("%s: Sent %d bytes of: %s\n",
2535 DBUS_AUTH_NAME (auth),
2537 _dbus_string_get_const_data (&auth->outgoing));
2539 _dbus_string_delete (&auth->outgoing,
2544 * Get a buffer to be used for reading bytes from the peer we're conversing
2545 * with. Bytes should be appended to this buffer.
2547 * @param auth the auth conversation
2548 * @param buffer return location for buffer to append bytes to
2551 _dbus_auth_get_buffer (DBusAuth *auth,
2552 DBusString **buffer)
2554 _dbus_assert (auth != NULL);
2555 _dbus_assert (!auth->buffer_outstanding);
2557 *buffer = &auth->incoming;
2559 auth->buffer_outstanding = TRUE;
2563 * Returns a buffer with new data read into it.
2565 * @param auth the auth conversation
2566 * @param buffer the buffer being returned
2569 _dbus_auth_return_buffer (DBusAuth *auth,
2572 _dbus_assert (buffer == &auth->incoming);
2573 _dbus_assert (auth->buffer_outstanding);
2575 auth->buffer_outstanding = FALSE;
2579 * Returns leftover bytes that were not used as part of the auth
2580 * conversation. These bytes will be part of the message stream
2581 * instead. This function may not be called until authentication has
2584 * @param auth the auth conversation
2585 * @param str return location for pointer to string of unused bytes
2588 _dbus_auth_get_unused_bytes (DBusAuth *auth,
2589 const DBusString **str)
2591 if (!DBUS_AUTH_IN_END_STATE (auth))
2594 *str = &auth->incoming;
2599 * Gets rid of unused bytes returned by _dbus_auth_get_unused_bytes()
2600 * after we've gotten them and successfully moved them elsewhere.
2602 * @param auth the auth conversation
2605 _dbus_auth_delete_unused_bytes (DBusAuth *auth)
2607 if (!DBUS_AUTH_IN_END_STATE (auth))
2610 _dbus_string_set_length (&auth->incoming, 0);
2614 * Called post-authentication, indicates whether we need to encode
2615 * the message stream with _dbus_auth_encode_data() prior to
2616 * sending it to the peer.
2618 * @param auth the auth conversation
2619 * @returns #TRUE if we need to encode the stream
2622 _dbus_auth_needs_encoding (DBusAuth *auth)
2624 if (auth->state != &common_state_authenticated)
2627 if (auth->mech != NULL)
2629 if (DBUS_AUTH_IS_CLIENT (auth))
2630 return auth->mech->client_encode_func != NULL;
2632 return auth->mech->server_encode_func != NULL;
2639 * Called post-authentication, encodes a block of bytes for sending to
2640 * the peer. If no encoding was negotiated, just copies the bytes
2641 * (you can avoid this by checking _dbus_auth_needs_encoding()).
2643 * @param auth the auth conversation
2644 * @param plaintext the plain text data
2645 * @param encoded initialized string to where encoded data is appended
2646 * @returns #TRUE if we had enough memory and successfully encoded
2649 _dbus_auth_encode_data (DBusAuth *auth,
2650 const DBusString *plaintext,
2651 DBusString *encoded)
2653 _dbus_assert (plaintext != encoded);
2655 if (auth->state != &common_state_authenticated)
2658 if (_dbus_auth_needs_encoding (auth))
2660 if (DBUS_AUTH_IS_CLIENT (auth))
2661 return (* auth->mech->client_encode_func) (auth, plaintext, encoded);
2663 return (* auth->mech->server_encode_func) (auth, plaintext, encoded);
2667 return _dbus_string_copy (plaintext, 0, encoded,
2668 _dbus_string_get_length (encoded));
2673 * Called post-authentication, indicates whether we need to decode
2674 * the message stream with _dbus_auth_decode_data() after
2675 * receiving it from the peer.
2677 * @param auth the auth conversation
2678 * @returns #TRUE if we need to encode the stream
2681 _dbus_auth_needs_decoding (DBusAuth *auth)
2683 if (auth->state != &common_state_authenticated)
2686 if (auth->mech != NULL)
2688 if (DBUS_AUTH_IS_CLIENT (auth))
2689 return auth->mech->client_decode_func != NULL;
2691 return auth->mech->server_decode_func != NULL;
2699 * Called post-authentication, decodes a block of bytes received from
2700 * the peer. If no encoding was negotiated, just copies the bytes (you
2701 * can avoid this by checking _dbus_auth_needs_decoding()).
2703 * @todo 1.0? We need to be able to distinguish "out of memory" error
2704 * from "the data is hosed" error.
2706 * @param auth the auth conversation
2707 * @param encoded the encoded data
2708 * @param plaintext initialized string where decoded data is appended
2709 * @returns #TRUE if we had enough memory and successfully decoded
2712 _dbus_auth_decode_data (DBusAuth *auth,
2713 const DBusString *encoded,
2714 DBusString *plaintext)
2716 _dbus_assert (plaintext != encoded);
2718 if (auth->state != &common_state_authenticated)
2721 if (_dbus_auth_needs_decoding (auth))
2723 if (DBUS_AUTH_IS_CLIENT (auth))
2724 return (* auth->mech->client_decode_func) (auth, encoded, plaintext);
2726 return (* auth->mech->server_decode_func) (auth, encoded, plaintext);
2730 return _dbus_string_copy (encoded, 0, plaintext,
2731 _dbus_string_get_length (plaintext));
2736 * Sets credentials received via reliable means from the operating
2739 * @param auth the auth conversation
2740 * @param credentials the credentials received
2741 * @returns #FALSE on OOM
2744 _dbus_auth_set_credentials (DBusAuth *auth,
2745 DBusCredentials *credentials)
2747 _dbus_credentials_clear (auth->credentials);
2748 return _dbus_credentials_add_credentials (auth->credentials,
2753 * Gets the identity we authorized the client as. Apps may have
2754 * different policies as to what identities they allow.
2756 * Returned credentials are not a copy and should not be modified
2758 * @param auth the auth conversation
2759 * @returns the credentials we've authorized BY REFERENCE do not modify
2762 _dbus_auth_get_identity (DBusAuth *auth)
2764 if (auth->state == &common_state_authenticated)
2766 return auth->authorized_identity;
2770 /* FIXME instead of this, keep an empty credential around that
2771 * doesn't require allocation or something
2773 /* return empty credentials */
2774 _dbus_assert (_dbus_credentials_are_empty (auth->authorized_identity));
2775 return auth->authorized_identity;
2780 * Gets the GUID from the server if we've authenticated; gets
2782 * @param auth the auth object
2783 * @returns the GUID in ASCII hex format
2786 _dbus_auth_get_guid_from_server (DBusAuth *auth)
2788 _dbus_assert (DBUS_AUTH_IS_CLIENT (auth));
2790 if (auth->state == &common_state_authenticated)
2791 return _dbus_string_get_const_data (& DBUS_AUTH_CLIENT (auth)->guid_from_server);
2797 * Sets the "authentication context" which scopes cookies
2798 * with the DBUS_COOKIE_SHA1 auth mechanism for example.
2800 * @param auth the auth conversation
2801 * @param context the context
2802 * @returns #FALSE if no memory
2805 _dbus_auth_set_context (DBusAuth *auth,
2806 const DBusString *context)
2808 return _dbus_string_replace_len (context, 0, _dbus_string_get_length (context),
2809 &auth->context, 0, _dbus_string_get_length (context));
2813 * Sets whether unix fd passing is potentially on the transport and
2814 * hence shall be negotiated.
2816 * @param auth the auth conversation
2817 * @param b TRUE when unix fd passing shall be negotiated, otherwise FALSE
2820 _dbus_auth_set_unix_fd_possible(DBusAuth *auth, dbus_bool_t b)
2822 auth->unix_fd_possible = b;
2826 * Queries whether unix fd passing was successfully negotiated.
2828 * @param auth the auth conversion
2829 * @returns #TRUE when unix fd passing was negotiated.
2832 _dbus_auth_get_unix_fd_negotiated(DBusAuth *auth)
2834 return auth->unix_fd_negotiated;
2839 /* tests in dbus-auth-util.c */