1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-auth.c Authentication
4 * Copyright (C) 2002, 2003 Red Hat Inc.
6 * Licensed under the Academic Free License version 1.2
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"
28 /* See doc/dbus-sasl-profile.txt */
31 * @defgroup DBusAuth Authentication
32 * @ingroup DBusInternals
33 * @brief DBusAuth object
35 * DBusAuth manages the authentication negotiation when a connection
36 * is first established, and also manage any encryption used over a
39 * The file doc/dbus-sasl-profile.txt documents the network protocol
40 * used for authentication.
44 * @defgroup DBusAuthInternals Authentication implementation details
45 * @ingroup DBusInternals
46 * @brief DBusAuth implementation details
48 * Private details of authentication code.
54 * Processes a command. Returns whether we had enough memory to
55 * complete the operation.
57 typedef dbus_bool_t (* DBusProcessAuthCommandFunction) (DBusAuth *auth,
58 const DBusString *command,
59 const DBusString *args);
64 DBusProcessAuthCommandFunction func;
65 } DBusAuthCommandHandler;
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);
101 const char *mechanism;
102 DBusAuthDataFunction server_data_func;
103 DBusAuthEncodeFunction server_encode_func;
104 DBusAuthDecodeFunction server_decode_func;
105 DBusAuthShutdownFunction server_shutdown_func;
106 DBusInitialResponseFunction client_initial_response_func;
107 DBusAuthDataFunction client_data_func;
108 DBusAuthEncodeFunction client_encode_func;
109 DBusAuthDecodeFunction client_decode_func;
110 DBusAuthShutdownFunction client_shutdown_func;
111 } DBusAuthMechanismHandler;
114 * Internal members of DBusAuth.
118 int refcount; /**< reference count */
120 DBusString incoming; /**< Incoming data buffer */
121 DBusString outgoing; /**< Outgoing data buffer */
123 const DBusAuthCommandHandler *handlers; /**< Handlers for commands */
125 const DBusAuthMechanismHandler *mech; /**< Current auth mechanism */
127 DBusString identity; /**< Current identity we're authorizing
131 DBusCredentials credentials; /**< Credentials, fields may be -1 */
133 DBusCredentials authorized_identity; /**< Credentials that are authorized */
135 unsigned int needed_memory : 1; /**< We needed memory to continue since last
136 * successful getting something done
138 unsigned int need_disconnect : 1; /**< We've given up, time to disconnect */
139 unsigned int authenticated : 1; /**< We are authenticated */
140 unsigned int authenticated_pending_output : 1; /**< Authenticated once we clear outgoing buffer */
141 unsigned int authenticated_pending_begin : 1; /**< Authenticated once we get BEGIN */
142 unsigned int already_got_mechanisms : 1; /**< Client already got mech list */
143 unsigned int already_asked_for_initial_response : 1; /**< Already sent a blank challenge to get an initial response */
150 DBusList *mechs_to_try;
160 static dbus_bool_t process_auth (DBusAuth *auth,
161 const DBusString *command,
162 const DBusString *args);
163 static dbus_bool_t process_cancel (DBusAuth *auth,
164 const DBusString *command,
165 const DBusString *args);
166 static dbus_bool_t process_begin (DBusAuth *auth,
167 const DBusString *command,
168 const DBusString *args);
169 static dbus_bool_t process_data_server (DBusAuth *auth,
170 const DBusString *command,
171 const DBusString *args);
172 static dbus_bool_t process_error_server (DBusAuth *auth,
173 const DBusString *command,
174 const DBusString *args);
175 static dbus_bool_t process_rejected (DBusAuth *auth,
176 const DBusString *command,
177 const DBusString *args);
178 static dbus_bool_t process_ok (DBusAuth *auth,
179 const DBusString *command,
180 const DBusString *args);
181 static dbus_bool_t process_data_client (DBusAuth *auth,
182 const DBusString *command,
183 const DBusString *args);
184 static dbus_bool_t process_error_client (DBusAuth *auth,
185 const DBusString *command,
186 const DBusString *args);
189 static dbus_bool_t client_try_next_mechanism (DBusAuth *auth);
190 static dbus_bool_t send_rejected (DBusAuth *auth);
192 static DBusAuthCommandHandler
193 server_handlers[] = {
194 { "AUTH", process_auth },
195 { "CANCEL", process_cancel },
196 { "BEGIN", process_begin },
197 { "DATA", process_data_server },
198 { "ERROR", process_error_server },
202 static DBusAuthCommandHandler
203 client_handlers[] = {
204 { "REJECTED", process_rejected },
205 { "OK", process_ok },
206 { "DATA", process_data_client },
207 { "ERROR", process_error_client },
212 * @param auth the auth conversation
213 * @returns #TRUE if the conversation is the server side
215 #define DBUS_AUTH_IS_SERVER(auth) ((auth)->handlers == server_handlers)
217 * @param auth the auth conversation
218 * @returns #TRUE if the conversation is the client side
220 #define DBUS_AUTH_IS_CLIENT(auth) ((auth)->handlers == client_handlers)
222 * @param auth the auth conversation
223 * @returns auth cast to DBusAuthClient
225 #define DBUS_AUTH_CLIENT(auth) ((DBusAuthClient*)(auth))
227 * @param auth the auth conversation
228 * @returns auth cast to DBusAuthServer
230 #define DBUS_AUTH_SERVER(auth) ((DBusAuthServer*)(auth))
233 _dbus_auth_new (int size)
237 auth = dbus_malloc0 (size);
243 auth->credentials.pid = -1;
244 auth->credentials.uid = -1;
245 auth->credentials.gid = -1;
247 auth->authorized_identity.pid = -1;
248 auth->authorized_identity.uid = -1;
249 auth->authorized_identity.gid = -1;
251 /* note that we don't use the max string length feature,
252 * because you can't use that feature if you're going to
253 * try to recover from out-of-memory (it creates
254 * what looks like unrecoverable inability to alloc
255 * more space in the string). But we do handle
256 * overlong buffers in _dbus_auth_do_work().
259 if (!_dbus_string_init (&auth->incoming, _DBUS_INT_MAX))
265 if (!_dbus_string_init (&auth->outgoing, _DBUS_INT_MAX))
267 _dbus_string_free (&auth->incoming);
272 if (!_dbus_string_init (&auth->identity, _DBUS_INT_MAX))
274 _dbus_string_free (&auth->incoming);
275 _dbus_string_free (&auth->outgoing);
284 get_state (DBusAuth *auth)
286 if (auth->need_disconnect)
287 return DBUS_AUTH_STATE_NEED_DISCONNECT;
288 else if (auth->authenticated)
290 if (_dbus_string_get_length (&auth->incoming) > 0)
291 return DBUS_AUTH_STATE_AUTHENTICATED_WITH_UNUSED_BYTES;
293 return DBUS_AUTH_STATE_AUTHENTICATED;
295 else if (auth->needed_memory)
296 return DBUS_AUTH_STATE_WAITING_FOR_MEMORY;
297 else if (_dbus_string_get_length (&auth->outgoing) > 0)
298 return DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND;
300 return DBUS_AUTH_STATE_WAITING_FOR_INPUT;
304 shutdown_mech (DBusAuth *auth)
306 /* Cancel any auth */
307 auth->authenticated_pending_begin = FALSE;
308 auth->authenticated = FALSE;
309 auth->already_asked_for_initial_response = FALSE;
310 _dbus_string_set_length (&auth->identity, 0);
311 auth->authorized_identity.pid = -1;
312 auth->authorized_identity.uid = -1;
313 auth->authorized_identity.gid = -1;
315 if (auth->mech != NULL)
317 _dbus_verbose ("Shutting down mechanism %s\n",
318 auth->mech->mechanism);
320 if (DBUS_AUTH_IS_CLIENT (auth))
321 (* auth->mech->client_shutdown_func) (auth);
323 (* auth->mech->server_shutdown_func) (auth);
330 handle_server_data_stupid_test_mech (DBusAuth *auth,
331 const DBusString *data)
333 if (!_dbus_string_append (&auth->outgoing,
337 auth->authenticated_pending_begin = TRUE;
343 handle_server_shutdown_stupid_test_mech (DBusAuth *auth)
349 handle_client_data_stupid_test_mech (DBusAuth *auth,
350 const DBusString *data)
357 handle_client_shutdown_stupid_test_mech (DBusAuth *auth)
362 /* the stupid test mech is a base64-encoded string;
363 * all the inefficiency, none of the security!
366 handle_encode_stupid_test_mech (DBusAuth *auth,
367 const DBusString *plaintext,
370 if (!_dbus_string_base64_encode (plaintext, 0, encoded,
371 _dbus_string_get_length (encoded)))
378 handle_decode_stupid_test_mech (DBusAuth *auth,
379 const DBusString *encoded,
380 DBusString *plaintext)
382 if (!_dbus_string_base64_decode (encoded, 0, plaintext,
383 _dbus_string_get_length (plaintext)))
390 handle_server_data_external_mech (DBusAuth *auth,
391 const DBusString *data)
393 DBusCredentials desired_identity;
395 if (auth->credentials.uid < 0)
397 _dbus_verbose ("no credentials, mechanism EXTERNAL can't authenticate\n");
398 return send_rejected (auth);
401 if (_dbus_string_get_length (data) > 0)
403 if (_dbus_string_get_length (&auth->identity) > 0)
405 /* Tried to send two auth identities, wtf */
406 return send_rejected (auth);
410 /* this is our auth identity */
411 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
416 /* Poke client for an auth identity, if none given */
417 if (_dbus_string_get_length (&auth->identity) == 0 &&
418 !auth->already_asked_for_initial_response)
420 if (_dbus_string_append (&auth->outgoing,
423 _dbus_verbose ("sending empty challenge asking client for auth identity\n");
424 auth->already_asked_for_initial_response = TRUE;
431 desired_identity.pid = -1;
432 desired_identity.uid = -1;
433 desired_identity.gid = -1;
435 /* If auth->identity is still empty here, then client
436 * responded with an empty string after we poked it for
437 * an initial response. This means to try to auth the
438 * identity provided in the credentials.
440 if (_dbus_string_get_length (&auth->identity) == 0)
442 desired_identity.uid = auth->credentials.uid;
446 if (!_dbus_credentials_from_uid_string (&auth->identity,
448 return send_rejected (auth);
451 if (desired_identity.uid < 0)
453 _dbus_verbose ("desired UID %d is no good\n", desired_identity.uid);
454 return send_rejected (auth);
457 if (_dbus_credentials_match (&auth->credentials,
460 /* client has authenticated */
461 _dbus_verbose ("authenticated client with UID %d matching socket credentials UID %d\n",
462 desired_identity.uid,
463 auth->credentials.uid);
465 if (!_dbus_string_append (&auth->outgoing,
469 auth->authorized_identity.uid = desired_identity.uid;
471 auth->authenticated_pending_begin = TRUE;
477 return send_rejected (auth);
482 handle_server_shutdown_external_mech (DBusAuth *auth)
488 handle_client_initial_response_external_mech (DBusAuth *auth,
489 DBusString *response)
491 /* We always append our UID as an initial response, so the server
492 * doesn't have to send back an empty challenge to check whether we
493 * want to specify an identity. i.e. this avoids a round trip that
494 * the spec for the EXTERNAL mechanism otherwise requires.
496 DBusString plaintext;
498 if (!_dbus_string_init (&plaintext, _DBUS_INT_MAX))
501 if (!_dbus_string_append_our_uid (&plaintext))
504 if (!_dbus_string_base64_encode (&plaintext, 0,
506 _dbus_string_get_length (response)))
509 _dbus_string_free (&plaintext);
514 _dbus_string_free (&plaintext);
519 handle_client_data_external_mech (DBusAuth *auth,
520 const DBusString *data)
527 handle_client_shutdown_external_mech (DBusAuth *auth)
532 /* Put mechanisms here in order of preference.
533 * What I eventually want to have is:
535 * - a mechanism that checks UNIX domain socket credentials
536 * - a simple magic cookie mechanism like X11 or ICE
537 * - mechanisms that chain to Cyrus SASL, so we can use anything it
538 * offers such as Kerberos, X509, whatever.
541 static const DBusAuthMechanismHandler
544 handle_server_data_external_mech,
546 handle_server_shutdown_external_mech,
547 handle_client_initial_response_external_mech,
548 handle_client_data_external_mech,
550 handle_client_shutdown_external_mech },
551 /* Obviously this has to die for production use */
552 { "DBUS_STUPID_TEST_MECH",
553 handle_server_data_stupid_test_mech,
554 handle_encode_stupid_test_mech,
555 handle_decode_stupid_test_mech,
556 handle_server_shutdown_stupid_test_mech,
558 handle_client_data_stupid_test_mech,
559 handle_encode_stupid_test_mech,
560 handle_decode_stupid_test_mech,
561 handle_client_shutdown_stupid_test_mech },
565 static const DBusAuthMechanismHandler*
566 find_mech (const DBusString *name)
571 while (all_mechanisms[i].mechanism != NULL)
573 if (_dbus_string_equal_c_str (name,
574 all_mechanisms[i].mechanism))
576 return &all_mechanisms[i];
585 send_rejected (DBusAuth *auth)
590 if (!_dbus_string_init (&command, _DBUS_INT_MAX))
593 if (!_dbus_string_append (&command,
598 while (all_mechanisms[i].mechanism != NULL)
600 if (!_dbus_string_append (&command,
604 if (!_dbus_string_append (&command,
605 all_mechanisms[i].mechanism))
611 if (!_dbus_string_append (&command, "\r\n"))
614 if (!_dbus_string_copy (&command, 0, &auth->outgoing,
615 _dbus_string_get_length (&auth->outgoing)))
621 _dbus_string_free (&command);
626 process_auth (DBusAuth *auth,
627 const DBusString *command,
628 const DBusString *args)
632 /* We are already using a mechanism, client is on crack */
633 if (!_dbus_string_append (&auth->outgoing,
634 "ERROR \"Sent AUTH while another AUTH in progress\"\r\n"))
639 else if (_dbus_string_get_length (args) == 0)
641 /* No args to the auth, send mechanisms */
642 if (!send_rejected (auth))
651 DBusString base64_response;
652 DBusString decoded_response;
654 _dbus_string_find_blank (args, 0, &i);
656 if (!_dbus_string_init (&mech, _DBUS_INT_MAX))
659 if (!_dbus_string_init (&base64_response, _DBUS_INT_MAX))
661 _dbus_string_free (&mech);
665 if (!_dbus_string_init (&decoded_response, _DBUS_INT_MAX))
667 _dbus_string_free (&mech);
668 _dbus_string_free (&base64_response);
672 if (!_dbus_string_copy_len (args, 0, i, &mech, 0))
675 if (!_dbus_string_copy (args, i, &base64_response, 0))
678 if (!_dbus_string_base64_decode (&base64_response, 0,
679 &decoded_response, 0))
682 auth->mech = find_mech (&mech);
683 if (auth->mech != NULL)
685 _dbus_verbose ("Trying mechanism %s with initial response of %d bytes\n",
686 auth->mech->mechanism,
687 _dbus_string_get_length (&decoded_response));
689 if (!(* auth->mech->server_data_func) (auth,
695 /* Unsupported mechanism */
696 if (!send_rejected (auth))
700 _dbus_string_free (&mech);
701 _dbus_string_free (&base64_response);
702 _dbus_string_free (&decoded_response);
708 _dbus_string_free (&mech);
709 _dbus_string_free (&base64_response);
710 _dbus_string_free (&decoded_response);
716 process_cancel (DBusAuth *auth,
717 const DBusString *command,
718 const DBusString *args)
720 shutdown_mech (auth);
726 process_begin (DBusAuth *auth,
727 const DBusString *command,
728 const DBusString *args)
730 if (auth->authenticated_pending_begin)
731 auth->authenticated = TRUE;
734 auth->need_disconnect = TRUE; /* client trying to send data before auth,
737 shutdown_mech (auth);
744 process_data_server (DBusAuth *auth,
745 const DBusString *command,
746 const DBusString *args)
748 if (auth->mech != NULL)
752 if (!_dbus_string_init (&decoded, _DBUS_INT_MAX))
755 if (!_dbus_string_base64_decode (args, 0, &decoded, 0))
757 _dbus_string_free (&decoded);
761 if (!(* auth->mech->server_data_func) (auth, &decoded))
763 _dbus_string_free (&decoded);
767 _dbus_string_free (&decoded);
771 if (!_dbus_string_append (&auth->outgoing,
772 "ERROR \"Not currently in an auth conversation\"\r\n"))
780 process_error_server (DBusAuth *auth,
781 const DBusString *command,
782 const DBusString *args)
788 /* return FALSE if no memory, TRUE if all OK */
790 get_word (const DBusString *str,
796 _dbus_string_skip_blank (str, *start, start);
797 _dbus_string_find_blank (str, *start, &i);
801 if (!_dbus_string_copy_len (str, *start, i, word, 0))
811 record_mechanisms (DBusAuth *auth,
812 const DBusString *command,
813 const DBusString *args)
818 if (auth->already_got_mechanisms)
821 len = _dbus_string_get_length (args);
827 const DBusAuthMechanismHandler *mech;
829 if (!_dbus_string_init (&m, _DBUS_INT_MAX))
832 if (!get_word (args, &next, &m))
835 mech = find_mech (&m);
839 /* FIXME right now we try mechanisms in the order
840 * the server lists them; should we do them in
841 * some more deterministic order?
843 * Probably in all_mechanisms order, our order of
844 * preference. Of course when the server is us,
845 * it lists things in that order anyhow.
848 _dbus_verbose ("Adding mechanism %s to list we will try\n",
851 if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
859 _dbus_string_get_const_data (&m, &s);
860 _dbus_verbose ("Server offered mechanism \"%s\" that we don't know how to use\n",
864 _dbus_string_free (&m);
867 auth->already_got_mechanisms = TRUE;
872 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
878 client_try_next_mechanism (DBusAuth *auth)
880 const DBusAuthMechanismHandler *mech;
881 DBusString auth_command;
883 if (DBUS_AUTH_CLIENT (auth)->mechs_to_try == NULL)
886 mech = DBUS_AUTH_CLIENT (auth)->mechs_to_try->data;
888 if (!_dbus_string_init (&auth_command, _DBUS_INT_MAX))
891 if (!_dbus_string_append (&auth_command,
894 _dbus_string_free (&auth_command);
898 if (!_dbus_string_append (&auth_command,
901 _dbus_string_free (&auth_command);
905 if (mech->client_initial_response_func != NULL)
907 if (!_dbus_string_append (&auth_command, " "))
909 _dbus_string_free (&auth_command);
913 if (!(* mech->client_initial_response_func) (auth, &auth_command))
915 _dbus_string_free (&auth_command);
920 if (!_dbus_string_append (&auth_command,
923 _dbus_string_free (&auth_command);
927 if (!_dbus_string_copy (&auth_command, 0,
929 _dbus_string_get_length (&auth->outgoing)))
931 _dbus_string_free (&auth_command);
936 _dbus_list_pop_first (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
938 _dbus_verbose ("Trying mechanism %s\n",
939 auth->mech->mechanism);
945 process_rejected (DBusAuth *auth,
946 const DBusString *command,
947 const DBusString *args)
949 shutdown_mech (auth);
951 if (!auth->already_got_mechanisms)
953 if (!record_mechanisms (auth, command, args))
957 if (DBUS_AUTH_CLIENT (auth)->mechs_to_try != NULL)
959 client_try_next_mechanism (auth);
964 auth->need_disconnect = TRUE;
971 process_ok (DBusAuth *auth,
972 const DBusString *command,
973 const DBusString *args)
975 if (!_dbus_string_append (&auth->outgoing,
979 auth->authenticated_pending_output = TRUE;
986 process_data_client (DBusAuth *auth,
987 const DBusString *command,
988 const DBusString *args)
990 if (auth->mech != NULL)
994 if (!_dbus_string_init (&decoded, _DBUS_INT_MAX))
997 if (!_dbus_string_base64_decode (args, 0, &decoded, 0))
999 _dbus_string_free (&decoded);
1003 if (!(* auth->mech->client_data_func) (auth, &decoded))
1005 _dbus_string_free (&decoded);
1009 _dbus_string_free (&decoded);
1013 if (!_dbus_string_append (&auth->outgoing,
1014 "ERROR \"Got DATA when not in an auth exchange\"\r\n"))
1022 process_error_client (DBusAuth *auth,
1023 const DBusString *command,
1024 const DBusString *args)
1030 process_unknown (DBusAuth *auth,
1031 const DBusString *command,
1032 const DBusString *args)
1034 if (!_dbus_string_append (&auth->outgoing,
1035 "ERROR \"Unknown command\"\r\n"))
1041 /* returns whether to call it again right away */
1043 process_command (DBusAuth *auth)
1054 if (!_dbus_string_find (&auth->incoming, 0, "\r\n", &eol))
1057 if (!_dbus_string_init (&command, _DBUS_INT_MAX))
1059 auth->needed_memory = TRUE;
1063 if (!_dbus_string_init (&args, _DBUS_INT_MAX))
1065 auth->needed_memory = TRUE;
1069 if (eol > _DBUS_ONE_MEGABYTE)
1071 /* This is a giant line, someone is trying to hose us. */
1072 if (!_dbus_string_append (&auth->outgoing, "ERROR \"Command too long\"\r\n"))
1078 if (!_dbus_string_copy_len (&auth->incoming, 0, eol, &command, 0))
1081 if (!_dbus_string_validate_ascii (&command, 0,
1082 _dbus_string_get_length (&command)))
1084 _dbus_verbose ("Command contained non-ASCII chars or embedded nul\n");
1085 if (!_dbus_string_append (&auth->outgoing, "ERROR \"Command contained non-ASCII\"\r\n"))
1093 _dbus_string_get_const_data (&command, &q);
1094 _dbus_verbose ("got command \"%s\"\n", q);
1097 _dbus_string_find_blank (&command, 0, &i);
1098 _dbus_string_skip_blank (&command, i, &j);
1101 _dbus_string_delete (&command, i, j - i);
1103 if (!_dbus_string_move (&command, i, &args, 0))
1107 while (auth->handlers[i].command != NULL)
1109 if (_dbus_string_equal_c_str (&command,
1110 auth->handlers[i].command))
1112 _dbus_verbose ("Processing auth command %s\n",
1113 auth->handlers[i].command);
1115 if (!(* auth->handlers[i].func) (auth, &command, &args))
1123 if (auth->handlers[i].command == NULL)
1125 if (!process_unknown (auth, &command, &args))
1131 /* We've succeeded in processing the whole command so drop it out
1132 * of the incoming buffer and return TRUE to try another command.
1135 _dbus_string_delete (&auth->incoming, 0, eol);
1138 _dbus_string_delete (&auth->incoming, 0, 2);
1143 _dbus_string_free (&args);
1144 _dbus_string_free (&command);
1147 auth->needed_memory = TRUE;
1149 auth->needed_memory = FALSE;
1158 * @addtogroup DBusAuth
1163 * Creates a new auth conversation object for the server side.
1164 * See doc/dbus-sasl-profile.txt for full details on what
1167 * @returns the new object or #NULL if no memory
1170 _dbus_auth_server_new (void)
1174 auth = _dbus_auth_new (sizeof (DBusAuthServer));
1178 auth->handlers = server_handlers;
1184 * Creates a new auth conversation object for the client side.
1185 * See doc/dbus-sasl-profile.txt for full details on what
1188 * @returns the new object or #NULL if no memory
1191 _dbus_auth_client_new (void)
1195 auth = _dbus_auth_new (sizeof (DBusAuthClient));
1199 auth->handlers = client_handlers;
1201 /* Add a default mechanism to try */
1202 if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
1203 (void*) &all_mechanisms[0]))
1205 _dbus_auth_unref (auth);
1209 /* Now try the mechanism we just added */
1210 if (!client_try_next_mechanism (auth))
1212 _dbus_auth_unref (auth);
1220 * Increments the refcount of an auth object.
1222 * @param auth the auth conversation
1225 _dbus_auth_ref (DBusAuth *auth)
1227 _dbus_assert (auth != NULL);
1229 auth->refcount += 1;
1233 * Decrements the refcount of an auth object.
1235 * @param auth the auth conversation
1238 _dbus_auth_unref (DBusAuth *auth)
1240 _dbus_assert (auth != NULL);
1241 _dbus_assert (auth->refcount > 0);
1243 auth->refcount -= 1;
1244 if (auth->refcount == 0)
1246 shutdown_mech (auth);
1248 if (DBUS_AUTH_IS_CLIENT (auth))
1250 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
1253 _dbus_string_free (&auth->identity);
1254 _dbus_string_free (&auth->incoming);
1255 _dbus_string_free (&auth->outgoing);
1261 * @param auth the auth conversation object
1262 * @returns #TRUE if we're in a final state
1264 #define DBUS_AUTH_IN_END_STATE(auth) ((auth)->need_disconnect || (auth)->authenticated)
1267 * Analyzes buffered input and moves the auth conversation forward,
1268 * returning the new state of the auth conversation.
1270 * @param auth the auth conversation
1271 * @returns the new state
1274 _dbus_auth_do_work (DBusAuth *auth)
1276 if (DBUS_AUTH_IN_END_STATE (auth))
1277 return get_state (auth);
1279 auth->needed_memory = FALSE;
1281 /* Max amount we'll buffer up before deciding someone's on crack */
1282 #define MAX_BUFFER (16 * 1024)
1286 if (_dbus_string_get_length (&auth->incoming) > MAX_BUFFER ||
1287 _dbus_string_get_length (&auth->outgoing) > MAX_BUFFER)
1289 auth->need_disconnect = TRUE;
1290 _dbus_verbose ("Disconnecting due to excessive data buffered in auth phase\n");
1294 if (auth->mech == NULL &&
1295 auth->already_got_mechanisms &&
1296 DBUS_AUTH_CLIENT (auth)->mechs_to_try == NULL)
1298 auth->need_disconnect = TRUE;
1299 _dbus_verbose ("Disconnecting because we are out of mechanisms to try using\n");
1303 while (process_command (auth));
1305 return get_state (auth);
1309 * Gets bytes that need to be sent to the peer we're conversing with.
1310 * After writing some bytes, _dbus_auth_bytes_sent() must be called
1311 * to notify the auth object that they were written.
1313 * @param auth the auth conversation
1314 * @param str return location for a ref to the buffer to send
1315 * @returns #FALSE if nothing to send
1318 _dbus_auth_get_bytes_to_send (DBusAuth *auth,
1319 const DBusString **str)
1321 _dbus_assert (auth != NULL);
1322 _dbus_assert (str != NULL);
1326 if (DBUS_AUTH_IN_END_STATE (auth))
1329 if (_dbus_string_get_length (&auth->outgoing) == 0)
1332 *str = &auth->outgoing;
1338 * Notifies the auth conversation object that
1339 * the given number of bytes of the outgoing buffer
1340 * have been written out.
1342 * @param auth the auth conversation
1343 * @param bytes_sent number of bytes written out
1346 _dbus_auth_bytes_sent (DBusAuth *auth,
1349 _dbus_string_delete (&auth->outgoing,
1352 if (auth->authenticated_pending_output &&
1353 _dbus_string_get_length (&auth->outgoing) == 0)
1354 auth->authenticated = TRUE;
1358 * Stores bytes received from the peer we're conversing with.
1360 * @param auth the auth conversation
1361 * @param str the received bytes.
1362 * @returns #FALSE if not enough memory to store the bytes.
1365 _dbus_auth_bytes_received (DBusAuth *auth,
1366 const DBusString *str)
1368 _dbus_assert (auth != NULL);
1369 _dbus_assert (str != NULL);
1371 if (DBUS_AUTH_IN_END_STATE (auth))
1374 auth->needed_memory = FALSE;
1376 if (!_dbus_string_copy (str, 0,
1378 _dbus_string_get_length (&auth->incoming)))
1380 auth->needed_memory = TRUE;
1384 _dbus_auth_do_work (auth);
1390 * Returns leftover bytes that were not used as part of the auth
1391 * conversation. These bytes will be part of the message stream
1392 * instead. This function may not be called until authentication has
1395 * @param auth the auth conversation
1396 * @param str string to append the unused bytes to
1397 * @returns #FALSE if not enough memory to return the bytes
1400 _dbus_auth_get_unused_bytes (DBusAuth *auth,
1403 if (!DBUS_AUTH_IN_END_STATE (auth))
1406 if (!_dbus_string_move (&auth->incoming,
1408 _dbus_string_get_length (str)))
1415 * Called post-authentication, indicates whether we need to encode
1416 * the message stream with _dbus_auth_encode_data() prior to
1417 * sending it to the peer.
1419 * @param auth the auth conversation
1420 * @returns #TRUE if we need to encode the stream
1423 _dbus_auth_needs_encoding (DBusAuth *auth)
1425 if (!auth->authenticated)
1428 if (auth->mech != NULL)
1430 if (DBUS_AUTH_IS_CLIENT (auth))
1431 return auth->mech->client_encode_func != NULL;
1433 return auth->mech->server_encode_func != NULL;
1440 * Called post-authentication, encodes a block of bytes for sending to
1441 * the peer. If no encoding was negotiated, just copies the bytes
1442 * (you can avoid this by checking _dbus_auth_needs_encoding()).
1444 * @param auth the auth conversation
1445 * @param plaintext the plain text data
1446 * @param encoded initialized string to where encoded data is appended
1447 * @returns #TRUE if we had enough memory and successfully encoded
1450 _dbus_auth_encode_data (DBusAuth *auth,
1451 const DBusString *plaintext,
1452 DBusString *encoded)
1454 _dbus_assert (plaintext != encoded);
1456 if (!auth->authenticated)
1459 if (_dbus_auth_needs_encoding (auth))
1461 if (DBUS_AUTH_IS_CLIENT (auth))
1462 return (* auth->mech->client_encode_func) (auth, plaintext, encoded);
1464 return (* auth->mech->server_encode_func) (auth, plaintext, encoded);
1468 return _dbus_string_copy (plaintext, 0, encoded,
1469 _dbus_string_get_length (encoded));
1474 * Called post-authentication, indicates whether we need to decode
1475 * the message stream with _dbus_auth_decode_data() after
1476 * receiving it from the peer.
1478 * @param auth the auth conversation
1479 * @returns #TRUE if we need to encode the stream
1482 _dbus_auth_needs_decoding (DBusAuth *auth)
1484 if (!auth->authenticated)
1487 if (auth->mech != NULL)
1489 if (DBUS_AUTH_IS_CLIENT (auth))
1490 return auth->mech->client_decode_func != NULL;
1492 return auth->mech->server_decode_func != NULL;
1500 * Called post-authentication, decodes a block of bytes received from
1501 * the peer. If no encoding was negotiated, just copies the bytes (you
1502 * can avoid this by checking _dbus_auth_needs_decoding()).
1504 * @todo We need to be able to distinguish "out of memory" error
1505 * from "the data is hosed" error.
1507 * @param auth the auth conversation
1508 * @param encoded the encoded data
1509 * @param plaintext initialized string where decoded data is appended
1510 * @returns #TRUE if we had enough memory and successfully decoded
1513 _dbus_auth_decode_data (DBusAuth *auth,
1514 const DBusString *encoded,
1515 DBusString *plaintext)
1517 _dbus_assert (plaintext != encoded);
1519 if (!auth->authenticated)
1522 if (_dbus_auth_needs_decoding (auth))
1524 if (DBUS_AUTH_IS_CLIENT (auth))
1525 return (* auth->mech->client_decode_func) (auth, encoded, plaintext);
1527 return (* auth->mech->server_decode_func) (auth, encoded, plaintext);
1531 return _dbus_string_copy (encoded, 0, plaintext,
1532 _dbus_string_get_length (plaintext));
1537 * Sets credentials received via reliable means from the operating
1540 * @param auth the auth conversation
1541 * @param credentials the credentials received
1544 _dbus_auth_set_credentials (DBusAuth *auth,
1545 const DBusCredentials *credentials)
1547 auth->credentials = *credentials;
1551 * Gets the identity we authorized the client as. Apps may have
1552 * different policies as to what identities they allow.
1554 * @param auth the auth conversation
1555 * @param credentials the credentials we've authorized
1558 _dbus_auth_get_identity (DBusAuth *auth,
1559 DBusCredentials *credentials)
1561 if (auth->authenticated)
1563 *credentials = auth->authorized_identity;
1567 credentials->pid = -1;
1568 credentials->uid = -1;
1569 credentials->gid = -1;