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.
42 * @todo some SASL profiles require sending the empty string as a
43 * challenge/response, but we don't currently allow that in our
48 * @defgroup DBusAuthInternals Authentication implementation details
49 * @ingroup DBusInternals
50 * @brief DBusAuth implementation details
52 * Private details of authentication code.
58 * Processes a command. Returns whether we had enough memory to
59 * complete the operation.
61 typedef dbus_bool_t (* DBusProcessAuthCommandFunction) (DBusAuth *auth,
62 const DBusString *command,
63 const DBusString *args);
68 DBusProcessAuthCommandFunction func;
69 } DBusAuthCommandHandler;
72 * This function appends an initial client response to the given string
74 typedef dbus_bool_t (* DBusInitialResponseFunction) (DBusAuth *auth,
75 DBusString *response);
78 * This function processes a block of data received from the peer.
79 * i.e. handles a DATA command.
81 typedef dbus_bool_t (* DBusAuthDataFunction) (DBusAuth *auth,
82 const DBusString *data);
85 * This function encodes a block of data from the peer.
87 typedef dbus_bool_t (* DBusAuthEncodeFunction) (DBusAuth *auth,
88 const DBusString *data,
92 * This function decodes a block of data from the peer.
94 typedef dbus_bool_t (* DBusAuthDecodeFunction) (DBusAuth *auth,
95 const DBusString *data,
99 * This function is called when the mechanism is abandoned.
101 typedef void (* DBusAuthShutdownFunction) (DBusAuth *auth);
105 const char *mechanism;
106 DBusAuthDataFunction server_data_func;
107 DBusAuthEncodeFunction server_encode_func;
108 DBusAuthDecodeFunction server_decode_func;
109 DBusAuthShutdownFunction server_shutdown_func;
110 DBusInitialResponseFunction client_initial_response_func;
111 DBusAuthDataFunction client_data_func;
112 DBusAuthEncodeFunction client_encode_func;
113 DBusAuthDecodeFunction client_decode_func;
114 DBusAuthShutdownFunction client_shutdown_func;
115 } DBusAuthMechanismHandler;
118 * Internal members of DBusAuth.
122 int refcount; /**< reference count */
124 DBusString incoming; /**< Incoming data buffer */
125 DBusString outgoing; /**< Outgoing data buffer */
127 const DBusAuthCommandHandler *handlers; /**< Handlers for commands */
129 const DBusAuthMechanismHandler *mech; /**< Current auth mechanism */
131 DBusString identity; /**< Current identity we're authorizing
135 DBusCredentials credentials; /**< Credentials, fields may be -1 */
137 DBusCredentials authorized_identity; /**< Credentials that are authorized */
139 unsigned int needed_memory : 1; /**< We needed memory to continue since last
140 * successful getting something done
142 unsigned int need_disconnect : 1; /**< We've given up, time to disconnect */
143 unsigned int authenticated : 1; /**< We are authenticated */
144 unsigned int authenticated_pending_output : 1; /**< Authenticated once we clear outgoing buffer */
145 unsigned int authenticated_pending_begin : 1; /**< Authenticated once we get BEGIN */
146 unsigned int already_got_mechanisms : 1; /**< Client already got mech list */
147 unsigned int already_asked_for_initial_response : 1; /**< Already sent a blank challenge to get an initial response */
154 DBusList *mechs_to_try; /**< Mechanisms we got from the server that we're going to try using */
162 int failures; /**< Number of times client has been rejected */
163 int max_failures; /**< Number of times we reject before disconnect */
167 static dbus_bool_t process_auth (DBusAuth *auth,
168 const DBusString *command,
169 const DBusString *args);
170 static dbus_bool_t process_cancel (DBusAuth *auth,
171 const DBusString *command,
172 const DBusString *args);
173 static dbus_bool_t process_begin (DBusAuth *auth,
174 const DBusString *command,
175 const DBusString *args);
176 static dbus_bool_t process_data_server (DBusAuth *auth,
177 const DBusString *command,
178 const DBusString *args);
179 static dbus_bool_t process_error_server (DBusAuth *auth,
180 const DBusString *command,
181 const DBusString *args);
182 static dbus_bool_t process_rejected (DBusAuth *auth,
183 const DBusString *command,
184 const DBusString *args);
185 static dbus_bool_t process_ok (DBusAuth *auth,
186 const DBusString *command,
187 const DBusString *args);
188 static dbus_bool_t process_data_client (DBusAuth *auth,
189 const DBusString *command,
190 const DBusString *args);
191 static dbus_bool_t process_error_client (DBusAuth *auth,
192 const DBusString *command,
193 const DBusString *args);
196 static dbus_bool_t client_try_next_mechanism (DBusAuth *auth);
197 static dbus_bool_t send_rejected (DBusAuth *auth);
199 static DBusAuthCommandHandler
200 server_handlers[] = {
201 { "AUTH", process_auth },
202 { "CANCEL", process_cancel },
203 { "BEGIN", process_begin },
204 { "DATA", process_data_server },
205 { "ERROR", process_error_server },
209 static DBusAuthCommandHandler
210 client_handlers[] = {
211 { "REJECTED", process_rejected },
212 { "OK", process_ok },
213 { "DATA", process_data_client },
214 { "ERROR", process_error_client },
219 * @param auth the auth conversation
220 * @returns #TRUE if the conversation is the server side
222 #define DBUS_AUTH_IS_SERVER(auth) ((auth)->handlers == server_handlers)
224 * @param auth the auth conversation
225 * @returns #TRUE if the conversation is the client side
227 #define DBUS_AUTH_IS_CLIENT(auth) ((auth)->handlers == client_handlers)
229 * @param auth the auth conversation
230 * @returns auth cast to DBusAuthClient
232 #define DBUS_AUTH_CLIENT(auth) ((DBusAuthClient*)(auth))
234 * @param auth the auth conversation
235 * @returns auth cast to DBusAuthServer
237 #define DBUS_AUTH_SERVER(auth) ((DBusAuthServer*)(auth))
240 _dbus_auth_new (int size)
244 auth = dbus_malloc0 (size);
250 auth->credentials.pid = -1;
251 auth->credentials.uid = -1;
252 auth->credentials.gid = -1;
254 auth->authorized_identity.pid = -1;
255 auth->authorized_identity.uid = -1;
256 auth->authorized_identity.gid = -1;
258 /* note that we don't use the max string length feature,
259 * because you can't use that feature if you're going to
260 * try to recover from out-of-memory (it creates
261 * what looks like unrecoverable inability to alloc
262 * more space in the string). But we do handle
263 * overlong buffers in _dbus_auth_do_work().
266 if (!_dbus_string_init (&auth->incoming, _DBUS_INT_MAX))
272 if (!_dbus_string_init (&auth->outgoing, _DBUS_INT_MAX))
274 _dbus_string_free (&auth->incoming);
279 if (!_dbus_string_init (&auth->identity, _DBUS_INT_MAX))
281 _dbus_string_free (&auth->incoming);
282 _dbus_string_free (&auth->outgoing);
291 shutdown_mech (DBusAuth *auth)
293 /* Cancel any auth */
294 auth->authenticated_pending_begin = FALSE;
295 auth->authenticated = FALSE;
296 auth->already_asked_for_initial_response = FALSE;
297 _dbus_string_set_length (&auth->identity, 0);
298 auth->authorized_identity.pid = -1;
299 auth->authorized_identity.uid = -1;
300 auth->authorized_identity.gid = -1;
302 if (auth->mech != NULL)
304 _dbus_verbose ("Shutting down mechanism %s\n",
305 auth->mech->mechanism);
307 if (DBUS_AUTH_IS_CLIENT (auth))
308 (* auth->mech->client_shutdown_func) (auth);
310 (* auth->mech->server_shutdown_func) (auth);
317 handle_server_data_stupid_test_mech (DBusAuth *auth,
318 const DBusString *data)
320 if (!_dbus_string_append (&auth->outgoing,
324 auth->authenticated_pending_begin = TRUE;
330 handle_server_shutdown_stupid_test_mech (DBusAuth *auth)
336 handle_client_data_stupid_test_mech (DBusAuth *auth,
337 const DBusString *data)
344 handle_client_shutdown_stupid_test_mech (DBusAuth *auth)
349 /* the stupid test mech is a base64-encoded string;
350 * all the inefficiency, none of the security!
353 handle_encode_stupid_test_mech (DBusAuth *auth,
354 const DBusString *plaintext,
357 if (!_dbus_string_base64_encode (plaintext, 0, encoded,
358 _dbus_string_get_length (encoded)))
365 handle_decode_stupid_test_mech (DBusAuth *auth,
366 const DBusString *encoded,
367 DBusString *plaintext)
369 if (!_dbus_string_base64_decode (encoded, 0, plaintext,
370 _dbus_string_get_length (plaintext)))
377 handle_server_data_external_mech (DBusAuth *auth,
378 const DBusString *data)
380 DBusCredentials desired_identity;
382 if (auth->credentials.uid < 0)
384 _dbus_verbose ("no credentials, mechanism EXTERNAL can't authenticate\n");
385 return send_rejected (auth);
388 if (_dbus_string_get_length (data) > 0)
390 if (_dbus_string_get_length (&auth->identity) > 0)
392 /* Tried to send two auth identities, wtf */
393 _dbus_verbose ("client tried to send auth identity, but we already have one\n");
394 return send_rejected (auth);
398 /* this is our auth identity */
399 if (!_dbus_string_copy (data, 0, &auth->identity, 0))
404 /* Poke client for an auth identity, if none given */
405 if (_dbus_string_get_length (&auth->identity) == 0 &&
406 !auth->already_asked_for_initial_response)
408 if (_dbus_string_append (&auth->outgoing,
411 _dbus_verbose ("sending empty challenge asking client for auth identity\n");
412 auth->already_asked_for_initial_response = TRUE;
419 desired_identity.pid = -1;
420 desired_identity.uid = -1;
421 desired_identity.gid = -1;
423 /* If auth->identity is still empty here, then client
424 * responded with an empty string after we poked it for
425 * an initial response. This means to try to auth the
426 * identity provided in the credentials.
428 if (_dbus_string_get_length (&auth->identity) == 0)
430 desired_identity.uid = auth->credentials.uid;
434 if (!_dbus_credentials_from_uid_string (&auth->identity,
437 _dbus_verbose ("could not get credentials from uid string\n");
438 return send_rejected (auth);
442 if (desired_identity.uid < 0)
444 _dbus_verbose ("desired UID %d is no good\n", desired_identity.uid);
445 return send_rejected (auth);
448 if (_dbus_credentials_match (&desired_identity,
451 /* client has authenticated */
452 _dbus_verbose ("authenticated client with UID %d matching socket credentials UID %d\n",
453 desired_identity.uid,
454 auth->credentials.uid);
456 if (!_dbus_string_append (&auth->outgoing,
460 auth->authorized_identity.uid = desired_identity.uid;
462 auth->authenticated_pending_begin = TRUE;
468 _dbus_verbose ("credentials uid=%d gid=%d do not allow uid=%d gid=%d\n",
469 auth->credentials.uid, auth->credentials.gid,
470 desired_identity.uid, desired_identity.gid);
471 return send_rejected (auth);
476 handle_server_shutdown_external_mech (DBusAuth *auth)
482 handle_client_initial_response_external_mech (DBusAuth *auth,
483 DBusString *response)
485 /* We always append our UID as an initial response, so the server
486 * doesn't have to send back an empty challenge to check whether we
487 * want to specify an identity. i.e. this avoids a round trip that
488 * the spec for the EXTERNAL mechanism otherwise requires.
490 DBusString plaintext;
492 if (!_dbus_string_init (&plaintext, _DBUS_INT_MAX))
495 if (!_dbus_string_append_our_uid (&plaintext))
498 if (!_dbus_string_base64_encode (&plaintext, 0,
500 _dbus_string_get_length (response)))
503 _dbus_string_free (&plaintext);
508 _dbus_string_free (&plaintext);
513 handle_client_data_external_mech (DBusAuth *auth,
514 const DBusString *data)
521 handle_client_shutdown_external_mech (DBusAuth *auth)
526 /* Put mechanisms here in order of preference.
527 * What I eventually want to have is:
529 * - a mechanism that checks UNIX domain socket credentials
530 * - a simple magic cookie mechanism like X11 or ICE
531 * - mechanisms that chain to Cyrus SASL, so we can use anything it
532 * offers such as Kerberos, X509, whatever.
535 static const DBusAuthMechanismHandler
538 handle_server_data_external_mech,
540 handle_server_shutdown_external_mech,
541 handle_client_initial_response_external_mech,
542 handle_client_data_external_mech,
544 handle_client_shutdown_external_mech },
545 /* Obviously this has to die for production use */
546 { "DBUS_STUPID_TEST_MECH",
547 handle_server_data_stupid_test_mech,
548 handle_encode_stupid_test_mech,
549 handle_decode_stupid_test_mech,
550 handle_server_shutdown_stupid_test_mech,
552 handle_client_data_stupid_test_mech,
553 handle_encode_stupid_test_mech,
554 handle_decode_stupid_test_mech,
555 handle_client_shutdown_stupid_test_mech },
559 static const DBusAuthMechanismHandler*
560 find_mech (const DBusString *name)
565 while (all_mechanisms[i].mechanism != NULL)
567 if (_dbus_string_equal_c_str (name,
568 all_mechanisms[i].mechanism))
570 return &all_mechanisms[i];
579 send_rejected (DBusAuth *auth)
582 DBusAuthServer *server_auth;
585 if (!_dbus_string_init (&command, _DBUS_INT_MAX))
588 if (!_dbus_string_append (&command,
593 while (all_mechanisms[i].mechanism != NULL)
595 if (!_dbus_string_append (&command,
599 if (!_dbus_string_append (&command,
600 all_mechanisms[i].mechanism))
606 if (!_dbus_string_append (&command, "\r\n"))
609 if (!_dbus_string_copy (&command, 0, &auth->outgoing,
610 _dbus_string_get_length (&auth->outgoing)))
613 _dbus_assert (DBUS_AUTH_IS_SERVER (auth));
614 server_auth = DBUS_AUTH_SERVER (auth);
615 server_auth->failures += 1;
620 _dbus_string_free (&command);
625 process_auth (DBusAuth *auth,
626 const DBusString *command,
627 const DBusString *args)
631 /* We are already using a mechanism, client is on crack */
632 if (!_dbus_string_append (&auth->outgoing,
633 "ERROR \"Sent AUTH while another AUTH in progress\"\r\n"))
638 else if (_dbus_string_get_length (args) == 0)
640 /* No args to the auth, send mechanisms */
641 if (!send_rejected (auth))
650 DBusString base64_response;
651 DBusString decoded_response;
653 _dbus_string_find_blank (args, 0, &i);
655 if (!_dbus_string_init (&mech, _DBUS_INT_MAX))
658 if (!_dbus_string_init (&base64_response, _DBUS_INT_MAX))
660 _dbus_string_free (&mech);
664 if (!_dbus_string_init (&decoded_response, _DBUS_INT_MAX))
666 _dbus_string_free (&mech);
667 _dbus_string_free (&base64_response);
671 if (!_dbus_string_copy_len (args, 0, i, &mech, 0))
674 if (!_dbus_string_copy (args, i, &base64_response, 0))
677 if (!_dbus_string_base64_decode (&base64_response, 0,
678 &decoded_response, 0))
681 auth->mech = find_mech (&mech);
682 if (auth->mech != NULL)
684 _dbus_verbose ("Trying mechanism %s with initial response of %d bytes\n",
685 auth->mech->mechanism,
686 _dbus_string_get_length (&decoded_response));
688 if (!(* auth->mech->server_data_func) (auth,
694 /* Unsupported mechanism */
695 if (!send_rejected (auth))
699 _dbus_string_free (&mech);
700 _dbus_string_free (&base64_response);
701 _dbus_string_free (&decoded_response);
707 _dbus_string_free (&mech);
708 _dbus_string_free (&base64_response);
709 _dbus_string_free (&decoded_response);
715 process_cancel (DBusAuth *auth,
716 const DBusString *command,
717 const DBusString *args)
719 shutdown_mech (auth);
725 process_begin (DBusAuth *auth,
726 const DBusString *command,
727 const DBusString *args)
729 if (auth->authenticated_pending_begin)
730 auth->authenticated = TRUE;
733 auth->need_disconnect = TRUE; /* client trying to send data before auth,
736 shutdown_mech (auth);
743 process_data_server (DBusAuth *auth,
744 const DBusString *command,
745 const DBusString *args)
747 if (auth->mech != NULL)
751 if (!_dbus_string_init (&decoded, _DBUS_INT_MAX))
754 if (!_dbus_string_base64_decode (args, 0, &decoded, 0))
756 _dbus_string_free (&decoded);
760 if (!(* auth->mech->server_data_func) (auth, &decoded))
762 _dbus_string_free (&decoded);
766 _dbus_string_free (&decoded);
770 if (!_dbus_string_append (&auth->outgoing,
771 "ERROR \"Not currently in an auth conversation\"\r\n"))
779 process_error_server (DBusAuth *auth,
780 const DBusString *command,
781 const DBusString *args)
787 /* return FALSE if no memory, TRUE if all OK */
789 get_word (const DBusString *str,
795 _dbus_string_skip_blank (str, *start, start);
796 _dbus_string_find_blank (str, *start, &i);
800 if (!_dbus_string_copy_len (str, *start, i, word, 0))
810 record_mechanisms (DBusAuth *auth,
811 const DBusString *command,
812 const DBusString *args)
817 if (auth->already_got_mechanisms)
820 len = _dbus_string_get_length (args);
826 const DBusAuthMechanismHandler *mech;
828 if (!_dbus_string_init (&m, _DBUS_INT_MAX))
831 if (!get_word (args, &next, &m))
834 mech = find_mech (&m);
838 /* FIXME right now we try mechanisms in the order
839 * the server lists them; should we do them in
840 * some more deterministic order?
842 * Probably in all_mechanisms order, our order of
843 * preference. Of course when the server is us,
844 * it lists things in that order anyhow.
847 _dbus_verbose ("Adding mechanism %s to list we will try\n",
850 if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
858 _dbus_string_get_const_data (&m, &s);
859 _dbus_verbose ("Server offered mechanism \"%s\" that we don't know how to use\n",
863 _dbus_string_free (&m);
866 auth->already_got_mechanisms = TRUE;
871 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
877 client_try_next_mechanism (DBusAuth *auth)
879 const DBusAuthMechanismHandler *mech;
880 DBusString auth_command;
882 if (DBUS_AUTH_CLIENT (auth)->mechs_to_try == NULL)
885 mech = DBUS_AUTH_CLIENT (auth)->mechs_to_try->data;
887 if (!_dbus_string_init (&auth_command, _DBUS_INT_MAX))
890 if (!_dbus_string_append (&auth_command,
893 _dbus_string_free (&auth_command);
897 if (!_dbus_string_append (&auth_command,
900 _dbus_string_free (&auth_command);
904 if (mech->client_initial_response_func != NULL)
906 if (!_dbus_string_append (&auth_command, " "))
908 _dbus_string_free (&auth_command);
912 if (!(* mech->client_initial_response_func) (auth, &auth_command))
914 _dbus_string_free (&auth_command);
919 if (!_dbus_string_append (&auth_command,
922 _dbus_string_free (&auth_command);
926 if (!_dbus_string_copy (&auth_command, 0,
928 _dbus_string_get_length (&auth->outgoing)))
930 _dbus_string_free (&auth_command);
935 _dbus_list_pop_first (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
937 _dbus_verbose ("Trying mechanism %s\n",
938 auth->mech->mechanism);
944 process_rejected (DBusAuth *auth,
945 const DBusString *command,
946 const DBusString *args)
948 shutdown_mech (auth);
950 if (!auth->already_got_mechanisms)
952 if (!record_mechanisms (auth, command, args))
956 if (DBUS_AUTH_CLIENT (auth)->mechs_to_try != NULL)
958 client_try_next_mechanism (auth);
963 auth->need_disconnect = TRUE;
970 process_ok (DBusAuth *auth,
971 const DBusString *command,
972 const DBusString *args)
974 if (!_dbus_string_append (&auth->outgoing,
978 auth->authenticated_pending_output = TRUE;
985 process_data_client (DBusAuth *auth,
986 const DBusString *command,
987 const DBusString *args)
989 if (auth->mech != NULL)
993 if (!_dbus_string_init (&decoded, _DBUS_INT_MAX))
996 if (!_dbus_string_base64_decode (args, 0, &decoded, 0))
998 _dbus_string_free (&decoded);
1002 if (!(* auth->mech->client_data_func) (auth, &decoded))
1004 _dbus_string_free (&decoded);
1008 _dbus_string_free (&decoded);
1012 if (!_dbus_string_append (&auth->outgoing,
1013 "ERROR \"Got DATA when not in an auth exchange\"\r\n"))
1021 process_error_client (DBusAuth *auth,
1022 const DBusString *command,
1023 const DBusString *args)
1029 process_unknown (DBusAuth *auth,
1030 const DBusString *command,
1031 const DBusString *args)
1033 if (!_dbus_string_append (&auth->outgoing,
1034 "ERROR \"Unknown command\"\r\n"))
1040 /* returns whether to call it again right away */
1042 process_command (DBusAuth *auth)
1050 /* _dbus_verbose (" trying process_command()\n"); */
1055 if (!_dbus_string_find (&auth->incoming, 0, "\r\n", &eol))
1058 if (!_dbus_string_init (&command, _DBUS_INT_MAX))
1060 auth->needed_memory = TRUE;
1064 if (!_dbus_string_init (&args, _DBUS_INT_MAX))
1066 auth->needed_memory = TRUE;
1070 if (eol > _DBUS_ONE_MEGABYTE)
1072 /* This is a giant line, someone is trying to hose us. */
1073 if (!_dbus_string_append (&auth->outgoing, "ERROR \"Command too long\"\r\n"))
1079 if (!_dbus_string_copy_len (&auth->incoming, 0, eol, &command, 0))
1082 if (!_dbus_string_validate_ascii (&command, 0,
1083 _dbus_string_get_length (&command)))
1085 _dbus_verbose ("Command contained non-ASCII chars or embedded nul\n");
1086 if (!_dbus_string_append (&auth->outgoing, "ERROR \"Command contained non-ASCII\"\r\n"))
1094 _dbus_string_get_const_data (&command, &q);
1095 _dbus_verbose ("got command \"%s\"\n", q);
1098 _dbus_string_find_blank (&command, 0, &i);
1099 _dbus_string_skip_blank (&command, i, &j);
1102 _dbus_string_delete (&command, i, j - i);
1104 if (!_dbus_string_move (&command, i, &args, 0))
1108 while (auth->handlers[i].command != NULL)
1110 if (_dbus_string_equal_c_str (&command,
1111 auth->handlers[i].command))
1113 _dbus_verbose ("Processing auth command %s\n",
1114 auth->handlers[i].command);
1116 if (!(* auth->handlers[i].func) (auth, &command, &args))
1124 if (auth->handlers[i].command == NULL)
1126 if (!process_unknown (auth, &command, &args))
1132 /* We've succeeded in processing the whole command so drop it out
1133 * of the incoming buffer and return TRUE to try another command.
1136 _dbus_string_delete (&auth->incoming, 0, eol);
1139 _dbus_string_delete (&auth->incoming, 0, 2);
1144 _dbus_string_free (&args);
1145 _dbus_string_free (&command);
1148 auth->needed_memory = TRUE;
1150 auth->needed_memory = FALSE;
1159 * @addtogroup DBusAuth
1164 * Creates a new auth conversation object for the server side.
1165 * See doc/dbus-sasl-profile.txt for full details on what
1168 * @returns the new object or #NULL if no memory
1171 _dbus_auth_server_new (void)
1174 DBusAuthServer *server_auth;
1176 auth = _dbus_auth_new (sizeof (DBusAuthServer));
1180 auth->handlers = server_handlers;
1182 server_auth = DBUS_AUTH_SERVER (auth);
1184 /* perhaps this should be per-mechanism with a lower
1187 server_auth->failures = 0;
1188 server_auth->max_failures = 6;
1194 * Creates a new auth conversation object for the client side.
1195 * See doc/dbus-sasl-profile.txt for full details on what
1198 * @returns the new object or #NULL if no memory
1201 _dbus_auth_client_new (void)
1205 auth = _dbus_auth_new (sizeof (DBusAuthClient));
1209 auth->handlers = client_handlers;
1211 /* Add a default mechanism to try */
1212 if (!_dbus_list_append (& DBUS_AUTH_CLIENT (auth)->mechs_to_try,
1213 (void*) &all_mechanisms[0]))
1215 _dbus_auth_unref (auth);
1219 /* Now try the mechanism we just added */
1220 if (!client_try_next_mechanism (auth))
1222 _dbus_auth_unref (auth);
1230 * Increments the refcount of an auth object.
1232 * @param auth the auth conversation
1235 _dbus_auth_ref (DBusAuth *auth)
1237 _dbus_assert (auth != NULL);
1239 auth->refcount += 1;
1243 * Decrements the refcount of an auth object.
1245 * @param auth the auth conversation
1248 _dbus_auth_unref (DBusAuth *auth)
1250 _dbus_assert (auth != NULL);
1251 _dbus_assert (auth->refcount > 0);
1253 auth->refcount -= 1;
1254 if (auth->refcount == 0)
1256 shutdown_mech (auth);
1258 if (DBUS_AUTH_IS_CLIENT (auth))
1260 _dbus_list_clear (& DBUS_AUTH_CLIENT (auth)->mechs_to_try);
1263 _dbus_string_free (&auth->identity);
1264 _dbus_string_free (&auth->incoming);
1265 _dbus_string_free (&auth->outgoing);
1271 * @param auth the auth conversation object
1272 * @returns #TRUE if we're in a final state
1274 #define DBUS_AUTH_IN_END_STATE(auth) ((auth)->need_disconnect || (auth)->authenticated)
1277 * Analyzes buffered input and moves the auth conversation forward,
1278 * returning the new state of the auth conversation.
1280 * @param auth the auth conversation
1281 * @returns the new state
1284 _dbus_auth_do_work (DBusAuth *auth)
1286 auth->needed_memory = FALSE;
1288 /* Max amount we'll buffer up before deciding someone's on crack */
1289 #define MAX_BUFFER (16 * _DBUS_ONE_KILOBYTE)
1293 if (DBUS_AUTH_IN_END_STATE (auth))
1296 if (_dbus_string_get_length (&auth->incoming) > MAX_BUFFER ||
1297 _dbus_string_get_length (&auth->outgoing) > MAX_BUFFER)
1299 auth->need_disconnect = TRUE;
1300 _dbus_verbose ("Disconnecting due to excessive data buffered in auth phase\n");
1304 if (auth->mech == NULL &&
1305 auth->already_got_mechanisms &&
1306 DBUS_AUTH_CLIENT (auth)->mechs_to_try == NULL)
1308 auth->need_disconnect = TRUE;
1309 _dbus_verbose ("Disconnecting because we are out of mechanisms to try using\n");
1313 while (process_command (auth));
1315 if (DBUS_AUTH_IS_SERVER (auth) &&
1316 DBUS_AUTH_SERVER (auth)->failures >=
1317 DBUS_AUTH_SERVER (auth)->max_failures)
1318 auth->need_disconnect = TRUE;
1320 if (auth->need_disconnect)
1321 return DBUS_AUTH_STATE_NEED_DISCONNECT;
1322 else if (auth->authenticated)
1324 if (_dbus_string_get_length (&auth->incoming) > 0)
1325 return DBUS_AUTH_STATE_AUTHENTICATED_WITH_UNUSED_BYTES;
1327 return DBUS_AUTH_STATE_AUTHENTICATED;
1329 else if (auth->needed_memory)
1330 return DBUS_AUTH_STATE_WAITING_FOR_MEMORY;
1331 else if (_dbus_string_get_length (&auth->outgoing) > 0)
1332 return DBUS_AUTH_STATE_HAVE_BYTES_TO_SEND;
1334 return DBUS_AUTH_STATE_WAITING_FOR_INPUT;
1338 * Gets bytes that need to be sent to the peer we're conversing with.
1339 * After writing some bytes, _dbus_auth_bytes_sent() must be called
1340 * to notify the auth object that they were written.
1342 * @param auth the auth conversation
1343 * @param str return location for a ref to the buffer to send
1344 * @returns #FALSE if nothing to send
1347 _dbus_auth_get_bytes_to_send (DBusAuth *auth,
1348 const DBusString **str)
1350 _dbus_assert (auth != NULL);
1351 _dbus_assert (str != NULL);
1355 if (DBUS_AUTH_IN_END_STATE (auth))
1358 if (_dbus_string_get_length (&auth->outgoing) == 0)
1361 *str = &auth->outgoing;
1367 * Notifies the auth conversation object that
1368 * the given number of bytes of the outgoing buffer
1369 * have been written out.
1371 * @param auth the auth conversation
1372 * @param bytes_sent number of bytes written out
1375 _dbus_auth_bytes_sent (DBusAuth *auth,
1378 _dbus_string_delete (&auth->outgoing,
1381 if (auth->authenticated_pending_output &&
1382 _dbus_string_get_length (&auth->outgoing) == 0)
1383 auth->authenticated = TRUE;
1387 * Stores bytes received from the peer we're conversing with.
1389 * @param auth the auth conversation
1390 * @param str the received bytes.
1391 * @returns #FALSE if not enough memory to store the bytes or we were already authenticated.
1394 _dbus_auth_bytes_received (DBusAuth *auth,
1395 const DBusString *str)
1397 _dbus_assert (auth != NULL);
1398 _dbus_assert (str != NULL);
1400 if (DBUS_AUTH_IN_END_STATE (auth))
1403 auth->needed_memory = FALSE;
1405 if (!_dbus_string_copy (str, 0,
1407 _dbus_string_get_length (&auth->incoming)))
1409 auth->needed_memory = TRUE;
1413 _dbus_auth_do_work (auth);
1419 * Returns leftover bytes that were not used as part of the auth
1420 * conversation. These bytes will be part of the message stream
1421 * instead. This function may not be called until authentication has
1424 * @param auth the auth conversation
1425 * @param str string to append the unused bytes to
1426 * @returns #FALSE if not enough memory to return the bytes
1429 _dbus_auth_get_unused_bytes (DBusAuth *auth,
1432 if (!DBUS_AUTH_IN_END_STATE (auth))
1435 if (!_dbus_string_move (&auth->incoming,
1437 _dbus_string_get_length (str)))
1444 * Called post-authentication, indicates whether we need to encode
1445 * the message stream with _dbus_auth_encode_data() prior to
1446 * sending it to the peer.
1448 * @param auth the auth conversation
1449 * @returns #TRUE if we need to encode the stream
1452 _dbus_auth_needs_encoding (DBusAuth *auth)
1454 if (!auth->authenticated)
1457 if (auth->mech != NULL)
1459 if (DBUS_AUTH_IS_CLIENT (auth))
1460 return auth->mech->client_encode_func != NULL;
1462 return auth->mech->server_encode_func != NULL;
1469 * Called post-authentication, encodes a block of bytes for sending to
1470 * the peer. If no encoding was negotiated, just copies the bytes
1471 * (you can avoid this by checking _dbus_auth_needs_encoding()).
1473 * @param auth the auth conversation
1474 * @param plaintext the plain text data
1475 * @param encoded initialized string to where encoded data is appended
1476 * @returns #TRUE if we had enough memory and successfully encoded
1479 _dbus_auth_encode_data (DBusAuth *auth,
1480 const DBusString *plaintext,
1481 DBusString *encoded)
1483 _dbus_assert (plaintext != encoded);
1485 if (!auth->authenticated)
1488 if (_dbus_auth_needs_encoding (auth))
1490 if (DBUS_AUTH_IS_CLIENT (auth))
1491 return (* auth->mech->client_encode_func) (auth, plaintext, encoded);
1493 return (* auth->mech->server_encode_func) (auth, plaintext, encoded);
1497 return _dbus_string_copy (plaintext, 0, encoded,
1498 _dbus_string_get_length (encoded));
1503 * Called post-authentication, indicates whether we need to decode
1504 * the message stream with _dbus_auth_decode_data() after
1505 * receiving it from the peer.
1507 * @param auth the auth conversation
1508 * @returns #TRUE if we need to encode the stream
1511 _dbus_auth_needs_decoding (DBusAuth *auth)
1513 if (!auth->authenticated)
1516 if (auth->mech != NULL)
1518 if (DBUS_AUTH_IS_CLIENT (auth))
1519 return auth->mech->client_decode_func != NULL;
1521 return auth->mech->server_decode_func != NULL;
1529 * Called post-authentication, decodes a block of bytes received from
1530 * the peer. If no encoding was negotiated, just copies the bytes (you
1531 * can avoid this by checking _dbus_auth_needs_decoding()).
1533 * @todo We need to be able to distinguish "out of memory" error
1534 * from "the data is hosed" error.
1536 * @param auth the auth conversation
1537 * @param encoded the encoded data
1538 * @param plaintext initialized string where decoded data is appended
1539 * @returns #TRUE if we had enough memory and successfully decoded
1542 _dbus_auth_decode_data (DBusAuth *auth,
1543 const DBusString *encoded,
1544 DBusString *plaintext)
1546 _dbus_assert (plaintext != encoded);
1548 if (!auth->authenticated)
1551 if (_dbus_auth_needs_decoding (auth))
1553 if (DBUS_AUTH_IS_CLIENT (auth))
1554 return (* auth->mech->client_decode_func) (auth, encoded, plaintext);
1556 return (* auth->mech->server_decode_func) (auth, encoded, plaintext);
1560 return _dbus_string_copy (encoded, 0, plaintext,
1561 _dbus_string_get_length (plaintext));
1566 * Sets credentials received via reliable means from the operating
1569 * @param auth the auth conversation
1570 * @param credentials the credentials received
1573 _dbus_auth_set_credentials (DBusAuth *auth,
1574 const DBusCredentials *credentials)
1576 auth->credentials = *credentials;
1580 * Gets the identity we authorized the client as. Apps may have
1581 * different policies as to what identities they allow.
1583 * @param auth the auth conversation
1584 * @param credentials the credentials we've authorized
1587 _dbus_auth_get_identity (DBusAuth *auth,
1588 DBusCredentials *credentials)
1590 if (auth->authenticated)
1592 *credentials = auth->authorized_identity;
1596 credentials->pid = -1;
1597 credentials->uid = -1;
1598 credentials->gid = -1;
1604 #ifdef DBUS_BUILD_TESTS
1605 #include "dbus-test.h"
1606 #include "dbus-auth-script.h"
1610 process_test_subdir (const DBusString *test_base_dir,
1613 DBusString test_directory;
1614 DBusString filename;
1617 DBusResultCode result;
1622 if (!_dbus_string_init (&test_directory, _DBUS_INT_MAX))
1623 _dbus_assert_not_reached ("didn't allocate test_directory\n");
1625 _dbus_string_init_const (&filename, subdir);
1627 if (!_dbus_string_copy (test_base_dir, 0,
1628 &test_directory, 0))
1629 _dbus_assert_not_reached ("couldn't copy test_base_dir to test_directory");
1631 if (!_dbus_concat_dir_and_file (&test_directory, &filename))
1632 _dbus_assert_not_reached ("couldn't allocate full path");
1634 _dbus_string_free (&filename);
1635 if (!_dbus_string_init (&filename, _DBUS_INT_MAX))
1636 _dbus_assert_not_reached ("didn't allocate filename string\n");
1638 dir = _dbus_directory_open (&test_directory, &result);
1642 _dbus_string_get_const_data (&test_directory, &s);
1643 _dbus_warn ("Could not open %s: %s\n", s,
1644 dbus_result_to_string (result));
1648 printf ("Testing:\n");
1650 result = DBUS_RESULT_SUCCESS;
1652 while (_dbus_directory_get_next_file (dir, &filename, &result))
1654 DBusString full_path;
1656 if (!_dbus_string_init (&full_path, _DBUS_INT_MAX))
1657 _dbus_assert_not_reached ("couldn't init string");
1659 if (!_dbus_string_copy (&test_directory, 0, &full_path, 0))
1660 _dbus_assert_not_reached ("couldn't copy dir to full_path");
1662 if (!_dbus_concat_dir_and_file (&full_path, &filename))
1663 _dbus_assert_not_reached ("couldn't concat file to dir");
1665 if (!_dbus_string_ends_with_c_str (&filename, ".auth-script"))
1667 const char *filename_c;
1668 _dbus_string_get_const_data (&filename, &filename_c);
1669 _dbus_verbose ("Skipping non-.auth-script file %s\n",
1676 _dbus_string_get_const_data (&filename, &s);
1677 printf (" %s\n", s);
1680 if (!_dbus_auth_script_run (&full_path))
1682 _dbus_string_free (&full_path);
1686 _dbus_string_free (&full_path);
1689 if (result != DBUS_RESULT_SUCCESS)
1692 _dbus_string_get_const_data (&test_directory, &s);
1693 _dbus_warn ("Could not get next file in %s: %s\n",
1694 s, dbus_result_to_string (result));
1703 _dbus_directory_close (dir);
1704 _dbus_string_free (&test_directory);
1705 _dbus_string_free (&filename);
1711 process_test_dirs (const char *test_data_dir)
1713 DBusString test_directory;
1718 _dbus_string_init_const (&test_directory, test_data_dir);
1720 if (!process_test_subdir (&test_directory, "auth"))
1727 _dbus_string_free (&test_directory);
1733 _dbus_auth_test (const char *test_data_dir)
1736 if (test_data_dir == NULL)
1739 if (!process_test_dirs (test_data_dir))
1745 #endif /* DBUS_BUILD_TESTS */