2 * Copyright (C) 2010-2011 Robert Ancell.
3 * Author: Robert Ancell <robert.ancell@canonical.com>
5 * This program is free software: you can redistribute it and/or modify it under
6 * the terms of the GNU General Public License as published by the Free Software
7 * Foundation, either version 3 of the License, or (at your option) any later
8 * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
21 #include "configuration.h"
22 #include "shared-data-manager.h"
35 static guint signals[LAST_SIGNAL] = { 0 };
39 /* PAM service to authenticate with */
41 gchar *autologin_pam_service;
43 /* Buffer for data read from greeter */
46 gboolean use_secure_memory;
48 /* Hints for the greeter */
51 /* Default session to use */
52 gchar *default_session;
54 /* Sequence number of current PAM session */
55 guint32 authentication_sequence_number;
57 /* Remote session name */
58 gchar *remote_session;
60 /* Currently selected user */
61 gchar *active_username;
63 /* PAM session being constructed by the greeter */
64 Session *authentication_session;
66 /* TRUE if a the greeter can handle a reset; else we will just kill it instead */
69 /* TRUE if a user has been authenticated and the session requested to start */
70 gboolean start_session;
72 /* TRUE if can log into guest accounts */
75 /* TRUE if logging into guest session */
76 gboolean guest_account_authenticated;
78 /* Communication channels to communicate with */
79 GIOChannel *to_greeter_channel;
80 GIOChannel *from_greeter_channel;
81 guint from_greeter_watch;
84 G_DEFINE_TYPE (Greeter, greeter, SESSION_TYPE);
86 /* Messages from the greeter to the server */
89 GREETER_MESSAGE_CONNECT = 0,
90 GREETER_MESSAGE_AUTHENTICATE,
91 GREETER_MESSAGE_AUTHENTICATE_AS_GUEST,
92 GREETER_MESSAGE_CONTINUE_AUTHENTICATION,
93 GREETER_MESSAGE_START_SESSION,
94 GREETER_MESSAGE_CANCEL_AUTHENTICATION,
95 GREETER_MESSAGE_SET_LANGUAGE,
96 GREETER_MESSAGE_AUTHENTICATE_REMOTE,
97 GREETER_MESSAGE_ENSURE_SHARED_DIR,
100 /* Messages from the server to the greeter */
103 SERVER_MESSAGE_CONNECTED = 0,
104 SERVER_MESSAGE_PROMPT_AUTHENTICATION,
105 SERVER_MESSAGE_END_AUTHENTICATION,
106 SERVER_MESSAGE_SESSION_RESULT,
107 SERVER_MESSAGE_SHARED_DIR_RESULT,
109 SERVER_MESSAGE_RESET,
112 static gboolean read_cb (GIOChannel *source, GIOCondition condition, gpointer data);
117 return g_object_new (GREETER_TYPE, NULL);
121 greeter_set_pam_services (Greeter *greeter, const gchar *pam_service, const gchar *autologin_pam_service)
123 g_free (greeter->priv->pam_service);
124 greeter->priv->pam_service = g_strdup (pam_service);
125 g_free (greeter->priv->autologin_pam_service);
126 greeter->priv->autologin_pam_service = g_strdup (autologin_pam_service);
130 greeter_set_allow_guest (Greeter *greeter, gboolean allow_guest)
132 greeter->priv->allow_guest = allow_guest;
136 greeter_clear_hints (Greeter *greeter)
138 g_hash_table_remove_all (greeter->priv->hints);
142 greeter_set_hint (Greeter *greeter, const gchar *name, const gchar *value)
144 g_hash_table_insert (greeter->priv->hints, g_strdup (name), g_strdup (value));
148 secure_malloc (Greeter *greeter, size_t n)
150 if (greeter->priv->use_secure_memory)
151 return gcry_malloc_secure (n);
157 secure_realloc (Greeter *greeter, void *ptr, size_t n)
159 if (greeter->priv->use_secure_memory)
160 return gcry_realloc (ptr, n);
162 return g_realloc (ptr, n);
166 secure_free (Greeter *greeter, void *ptr)
168 if (greeter->priv->use_secure_memory)
169 return gcry_free (ptr);
180 #define HEADER_SIZE (sizeof (guint32) * 2)
181 #define MAX_MESSAGE_LENGTH 1024
184 write_message (Greeter *greeter, guint8 *message, gsize message_length)
188 GError *error = NULL;
190 data = (gchar *) message;
191 data_length = message_length;
192 while (data_length > 0)
197 status = g_io_channel_write_chars (greeter->priv->to_greeter_channel, data, data_length, &n_written, &error);
199 l_warning (greeter, "Error writing to greeter: %s", error->message);
200 g_clear_error (&error);
201 if (status != G_IO_STATUS_NORMAL)
203 data_length -= n_written;
207 g_io_channel_flush (greeter->priv->to_greeter_channel, &error);
209 l_warning (greeter, "Failed to flush data to greeter: %s", error->message);
210 g_clear_error (&error);
214 write_int (guint8 *buffer, gint buffer_length, guint32 value, gsize *offset)
216 if (*offset + 4 >= buffer_length)
218 buffer[*offset] = value >> 24;
219 buffer[*offset+1] = (value >> 16) & 0xFF;
220 buffer[*offset+2] = (value >> 8) & 0xFF;
221 buffer[*offset+3] = value & 0xFF;
226 write_string (guint8 *buffer, gint buffer_length, const gchar *value, gsize *offset)
231 length = strlen (value);
234 write_int (buffer, buffer_length, length, offset);
235 if (*offset + length >= buffer_length)
239 memcpy (buffer + *offset, value, length);
245 write_header (guint8 *buffer, gint buffer_length, guint32 id, guint32 length, gsize *offset)
247 write_int (buffer, buffer_length, id, offset);
248 write_int (buffer, buffer_length, length, offset);
252 string_length (const gchar *value)
255 return int_length ();
257 return int_length () + strlen (value);
261 handle_connect (Greeter *greeter, const gchar *version, gboolean resettable)
263 guint8 message[MAX_MESSAGE_LENGTH];
269 l_debug (greeter, "Greeter connected version=%s resettable=%s", version, resettable ? "true" : "false");
271 greeter->priv->resettable = resettable;
273 length = string_length (VERSION);
274 g_hash_table_iter_init (&iter, greeter->priv->hints);
275 while (g_hash_table_iter_next (&iter, &key, &value))
276 length += string_length (key) + string_length (value);
278 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_CONNECTED, length, &offset);
279 write_string (message, MAX_MESSAGE_LENGTH, VERSION, &offset);
280 g_hash_table_iter_init (&iter, greeter->priv->hints);
281 while (g_hash_table_iter_next (&iter, &key, &value))
283 write_string (message, MAX_MESSAGE_LENGTH, key, &offset);
284 write_string (message, MAX_MESSAGE_LENGTH, value, &offset);
286 write_message (greeter, message, offset);
288 g_signal_emit (greeter, signals[CONNECTED], 0);
292 pam_messages_cb (Session *session, Greeter *greeter)
296 guint8 message[MAX_MESSAGE_LENGTH];
297 const struct pam_message *messages;
302 messages = session_get_messages (session);
303 messages_length = session_get_messages_length (session);
305 /* Respond to d-bus query with messages */
306 l_debug (greeter, "Prompt greeter with %d message(s)", messages_length);
307 size = int_length () + string_length (session_get_username (session)) + int_length ();
308 for (i = 0; i < messages_length; i++)
309 size += int_length () + string_length (messages[i].msg);
311 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_PROMPT_AUTHENTICATION, size, &offset);
312 write_int (message, MAX_MESSAGE_LENGTH, greeter->priv->authentication_sequence_number, &offset);
313 write_string (message, MAX_MESSAGE_LENGTH, session_get_username (session), &offset);
314 write_int (message, MAX_MESSAGE_LENGTH, messages_length, &offset);
315 for (i = 0; i < messages_length; i++)
317 write_int (message, MAX_MESSAGE_LENGTH, messages[i].msg_style, &offset);
318 write_string (message, MAX_MESSAGE_LENGTH, messages[i].msg, &offset);
320 if (messages[i].msg_style == PAM_PROMPT_ECHO_OFF || messages[i].msg_style == PAM_PROMPT_ECHO_ON)
323 write_message (greeter, message, offset);
325 /* Continue immediately if nothing to respond with */
326 // FIXME: Should probably give the greeter a chance to ack the message
329 struct pam_response *response;
330 response = calloc (messages_length, sizeof (struct pam_response));
331 session_respond (greeter->priv->authentication_session, response);
337 send_end_authentication (Greeter *greeter, guint32 sequence_number, const gchar *username, int result)
339 guint8 message[MAX_MESSAGE_LENGTH];
342 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_END_AUTHENTICATION, int_length () + string_length (username) + int_length (), &offset);
343 write_int (message, MAX_MESSAGE_LENGTH, sequence_number, &offset);
344 write_string (message, MAX_MESSAGE_LENGTH, username, &offset);
345 write_int (message, MAX_MESSAGE_LENGTH, result, &offset);
346 write_message (greeter, message, offset);
350 greeter_idle (Greeter *greeter)
352 guint8 message[MAX_MESSAGE_LENGTH];
355 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_IDLE, 0, &offset);
356 write_message (greeter, message, offset);
360 greeter_reset (Greeter *greeter)
362 guint8 message[MAX_MESSAGE_LENGTH];
368 g_hash_table_iter_init (&iter, greeter->priv->hints);
369 while (g_hash_table_iter_next (&iter, &key, &value))
370 length += string_length (key) + string_length (value);
372 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_RESET, length, &offset);
373 g_hash_table_iter_init (&iter, greeter->priv->hints);
374 while (g_hash_table_iter_next (&iter, &key, &value))
376 write_string (message, MAX_MESSAGE_LENGTH, key, &offset);
377 write_string (message, MAX_MESSAGE_LENGTH, value, &offset);
379 write_message (greeter, message, offset);
383 authentication_complete_cb (Session *session, Greeter *greeter)
387 l_debug (greeter, "Authenticate result for user %s: %s", session_get_username (session), session_get_authentication_result_string (session));
389 result = session_get_authentication_result (session);
390 if (session_get_is_authenticated (session))
392 if (session_get_user (session))
393 l_debug (greeter, "User %s authorized", session_get_username (session));
396 l_debug (greeter, "User %s authorized, but no account of that name exists", session_get_username (session));
397 result = PAM_USER_UNKNOWN;
401 send_end_authentication (greeter, greeter->priv->authentication_sequence_number, session_get_username (session), result);
405 reset_session (Greeter *greeter)
407 g_free (greeter->priv->remote_session);
408 greeter->priv->remote_session = NULL;
409 if (greeter->priv->authentication_session)
411 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
412 session_stop (greeter->priv->authentication_session);
413 g_object_unref (greeter->priv->authentication_session);
414 greeter->priv->authentication_session = NULL;
417 greeter->priv->guest_account_authenticated = FALSE;
421 handle_login (Greeter *greeter, guint32 sequence_number, const gchar *username)
423 const gchar *autologin_username, *service;
424 gboolean is_interactive;
426 if (username[0] == '\0')
428 l_debug (greeter, "Greeter start authentication");
432 l_debug (greeter, "Greeter start authentication for %s", username);
434 reset_session (greeter);
436 if (greeter->priv->active_username)
437 g_free (greeter->priv->active_username);
438 greeter->priv->active_username = g_strdup (username);
439 g_object_notify (G_OBJECT (greeter), GREETER_PROPERTY_ACTIVE_USERNAME);
441 greeter->priv->authentication_sequence_number = sequence_number;
442 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
443 if (!greeter->priv->authentication_session)
445 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
449 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_GOT_MESSAGES, G_CALLBACK (pam_messages_cb), greeter);
450 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_AUTHENTICATION_COMPLETE, G_CALLBACK (authentication_complete_cb), greeter);
452 /* Use non-interactive service for autologin user */
453 autologin_username = g_hash_table_lookup (greeter->priv->hints, "autologin-user");
454 if (autologin_username != NULL && g_strcmp0 (username, autologin_username) == 0)
456 service = greeter->priv->autologin_pam_service;
457 is_interactive = FALSE;
461 service = greeter->priv->pam_service;
462 is_interactive = TRUE;
465 /* Run the session process */
466 session_set_pam_service (greeter->priv->authentication_session, service);
467 session_set_username (greeter->priv->authentication_session, username);
468 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
469 session_set_is_interactive (greeter->priv->authentication_session, is_interactive);
470 session_start (greeter->priv->authentication_session);
474 handle_login_as_guest (Greeter *greeter, guint32 sequence_number)
476 l_debug (greeter, "Greeter start authentication for guest account");
478 reset_session (greeter);
480 if (!greeter->priv->allow_guest)
482 l_debug (greeter, "Guest account is disabled");
483 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
487 greeter->priv->guest_account_authenticated = TRUE;
488 send_end_authentication (greeter, sequence_number, "", PAM_SUCCESS);
492 get_remote_session_service (const gchar *session_name)
494 GKeyFile *session_desktop_file;
497 gchar *remote_sessions_dir, *filename, *path, *service = NULL;
498 GError *error = NULL;
500 /* Validate session name doesn't contain directory separators */
501 for (c = session_name; *c; c++)
507 /* Load the session file */
508 session_desktop_file = g_key_file_new ();
509 filename = g_strdup_printf ("%s.desktop", session_name);
510 remote_sessions_dir = config_get_string (config_get_instance (), "LightDM", "remote-sessions-directory");
511 path = g_build_filename (remote_sessions_dir, filename, NULL);
512 g_free (remote_sessions_dir);
514 result = g_key_file_load_from_file (session_desktop_file, path, G_KEY_FILE_NONE, &error);
516 g_debug ("Failed to load session file %s: %s", path, error->message);
518 g_clear_error (&error);
520 service = g_key_file_get_string (session_desktop_file, G_KEY_FILE_DESKTOP_GROUP, "X-LightDM-PAM-Service", NULL);
521 g_key_file_free (session_desktop_file);
527 handle_login_remote (Greeter *greeter, const gchar *session_name, const gchar *username, guint32 sequence_number)
531 if (username[0] == '\0')
533 l_debug (greeter, "Greeter start authentication for remote session %s", session_name);
537 l_debug (greeter, "Greeter start authentication for remote session %s as user %s", session_name, username);
539 reset_session (greeter);
541 service = get_remote_session_service (session_name);
544 send_end_authentication (greeter, sequence_number, "", PAM_SYSTEM_ERR);
548 greeter->priv->authentication_sequence_number = sequence_number;
549 greeter->priv->remote_session = g_strdup (session_name);
550 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
551 if (greeter->priv->authentication_session)
553 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_GOT_MESSAGES, G_CALLBACK (pam_messages_cb), greeter);
554 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_AUTHENTICATION_COMPLETE, G_CALLBACK (authentication_complete_cb), greeter);
556 /* Run the session process */
557 session_set_pam_service (greeter->priv->authentication_session, service);
558 session_set_username (greeter->priv->authentication_session, username);
559 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
560 session_set_is_interactive (greeter->priv->authentication_session, TRUE);
561 session_set_is_guest (greeter->priv->authentication_session, TRUE);
562 session_start (greeter->priv->authentication_session);
567 if (!greeter->priv->authentication_session)
569 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
575 handle_continue_authentication (Greeter *greeter, gchar **secrets)
578 const struct pam_message *messages;
579 struct pam_response *response;
580 int i, j, n_prompts = 0;
582 /* Not in authentication */
583 if (greeter->priv->authentication_session == NULL)
586 messages_length = session_get_messages_length (greeter->priv->authentication_session);
587 messages = session_get_messages (greeter->priv->authentication_session);
589 /* Check correct number of responses */
590 for (i = 0; i < messages_length; i++)
592 int msg_style = messages[i].msg_style;
593 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
596 if (g_strv_length (secrets) != n_prompts)
598 session_respond_error (greeter->priv->authentication_session, PAM_CONV_ERR);
602 l_debug (greeter, "Continue authentication");
605 response = calloc (messages_length, sizeof (struct pam_response));
606 for (i = 0, j = 0; i < messages_length; i++)
608 int msg_style = messages[i].msg_style;
609 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
611 size_t secret_length = strlen (secrets[j]) + 1;
612 response[i].resp = secure_malloc (greeter, secret_length);
613 memcpy (response[i].resp, secrets[j], secret_length); // FIXME: Need to convert from UTF-8
618 session_respond (greeter->priv->authentication_session, response);
620 for (i = 0; i < messages_length; i++)
621 secure_free (greeter, response[i].resp);
626 handle_cancel_authentication (Greeter *greeter)
628 /* Not in authentication */
629 if (greeter->priv->authentication_session == NULL)
632 l_debug (greeter, "Cancel authentication");
633 reset_session (greeter);
637 handle_start_session (Greeter *greeter, const gchar *session)
640 guint8 message[MAX_MESSAGE_LENGTH];
642 SessionType session_type = SESSION_TYPE_LOCAL;
644 if (strcmp (session, "") == 0)
647 /* Use session type chosen in remote session */
648 if (greeter->priv->remote_session)
650 session_type = SESSION_TYPE_REMOTE;
651 session = greeter->priv->remote_session;
654 if (greeter->priv->guest_account_authenticated || session_get_is_authenticated (greeter->priv->authentication_session))
657 l_debug (greeter, "Greeter requests session %s", session);
659 l_debug (greeter, "Greeter requests default session");
660 greeter->priv->start_session = TRUE;
661 g_signal_emit (greeter, signals[START_SESSION], 0, session_type, session, &result);
665 l_debug (greeter, "Ignoring start session request, user is not authorized");
669 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SESSION_RESULT, int_length (), &offset);
670 write_int (message, MAX_MESSAGE_LENGTH, result ? 0 : 1, &offset);
671 write_message (greeter, message, offset);
675 handle_set_language (Greeter *greeter, const gchar *language)
679 if (!greeter->priv->guest_account_authenticated && !session_get_is_authenticated (greeter->priv->authentication_session))
681 l_debug (greeter, "Ignoring set language request, user is not authorized");
685 // FIXME: Could use this
686 if (greeter->priv->guest_account_authenticated)
688 l_debug (greeter, "Ignoring set language request for guest user");
692 l_debug (greeter, "Greeter sets language %s", language);
693 user = session_get_user (greeter->priv->authentication_session);
694 user_set_language (user, language);
698 handle_ensure_shared_dir (Greeter *greeter, const gchar *username)
701 guint8 message[MAX_MESSAGE_LENGTH];
704 l_debug (greeter, "Greeter requests data directory for user %s", username);
706 dir = shared_data_manager_ensure_user_dir (shared_data_manager_get_instance (), username);
708 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SHARED_DIR_RESULT, string_length (dir), &offset);
709 write_string (message, MAX_MESSAGE_LENGTH, dir, &offset);
710 write_message (greeter, message, offset);
716 read_int (Greeter *greeter, gsize *offset)
720 if (greeter->priv->n_read - *offset < sizeof (guint32))
722 l_warning (greeter, "Not enough space for int, need %zu, got %zu", sizeof (guint32), greeter->priv->n_read - *offset);
725 buffer = greeter->priv->read_buffer + *offset;
726 value = buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3];
727 *offset += int_length ();
732 get_message_length (Greeter *greeter)
737 offset = int_length ();
738 payload_length = read_int (greeter, &offset);
740 if (HEADER_SIZE + payload_length < HEADER_SIZE)
742 l_warning (greeter, "Payload length of %u octets too long", payload_length);
746 return HEADER_SIZE + payload_length;
750 read_string_full (Greeter *greeter, gsize *offset, void* (*alloc_fn)(size_t n))
755 length = read_int (greeter, offset);
756 if (greeter->priv->n_read - *offset < length)
758 l_warning (greeter, "Not enough space for string, need %u, got %zu", length, greeter->priv->n_read - *offset);
759 return g_strdup ("");
762 value = (*alloc_fn) (sizeof (gchar) * (length + 1));
763 memcpy (value, greeter->priv->read_buffer + *offset, length);
764 value[length] = '\0';
771 read_string (Greeter *greeter, gsize *offset)
773 return read_string_full (greeter, offset, g_malloc);
777 read_secret (Greeter *greeter, gsize *offset)
779 if (greeter->priv->use_secure_memory)
780 return read_string_full (greeter, offset, gcry_malloc_secure);
782 return read_string_full (greeter, offset, g_malloc);
786 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
788 Greeter *greeter = data;
789 gsize n_to_read, n_read, offset;
792 guint32 sequence_number, n_secrets, max_secrets;
793 gchar *version, *username, *session_name, *language;
795 gboolean resettable = FALSE;
796 GError *error = NULL;
798 if (condition == G_IO_HUP)
800 l_debug (greeter, "Greeter closed communication channel");
801 greeter->priv->from_greeter_watch = 0;
805 n_to_read = HEADER_SIZE;
806 if (greeter->priv->n_read >= HEADER_SIZE)
808 n_to_read = get_message_length (greeter);
809 if (n_to_read <= HEADER_SIZE)
811 greeter->priv->from_greeter_watch = 0;
816 status = g_io_channel_read_chars (greeter->priv->from_greeter_channel,
817 (gchar *) greeter->priv->read_buffer + greeter->priv->n_read,
818 n_to_read - greeter->priv->n_read,
822 l_warning (greeter, "Error reading from greeter: %s", error->message);
823 g_clear_error (&error);
824 if (status != G_IO_STATUS_NORMAL)
827 greeter->priv->n_read += n_read;
828 if (greeter->priv->n_read != n_to_read)
831 /* If have header, rerun for content */
832 if (greeter->priv->n_read == HEADER_SIZE)
834 n_to_read = get_message_length (greeter);
835 if (n_to_read > HEADER_SIZE)
837 greeter->priv->read_buffer = secure_realloc (greeter, greeter->priv->read_buffer, n_to_read);
838 read_cb (source, condition, greeter);
844 id = read_int (greeter, &offset);
845 length = HEADER_SIZE + read_int (greeter, &offset);
848 case GREETER_MESSAGE_CONNECT:
849 version = read_string (greeter, &offset);
851 resettable = read_int (greeter, &offset) != 0;
852 handle_connect (greeter, version, resettable);
855 case GREETER_MESSAGE_AUTHENTICATE:
856 sequence_number = read_int (greeter, &offset);
857 username = read_string (greeter, &offset);
858 handle_login (greeter, sequence_number, username);
861 case GREETER_MESSAGE_AUTHENTICATE_AS_GUEST:
862 sequence_number = read_int (greeter, &offset);
863 handle_login_as_guest (greeter, sequence_number);
865 case GREETER_MESSAGE_AUTHENTICATE_REMOTE:
866 sequence_number = read_int (greeter, &offset);
867 session_name = read_string (greeter, &offset);
868 username = read_string (greeter, &offset);
869 handle_login_remote (greeter, session_name, username, sequence_number);
871 case GREETER_MESSAGE_CONTINUE_AUTHENTICATION:
872 n_secrets = read_int (greeter, &offset);
873 max_secrets = (G_MAXUINT32 - 1) / sizeof (gchar *);
874 if (n_secrets > max_secrets)
876 l_warning (greeter, "Array length of %u elements too long", n_secrets);
877 greeter->priv->from_greeter_watch = 0;
880 secrets = g_malloc (sizeof (gchar *) * (n_secrets + 1));
881 for (i = 0; i < n_secrets; i++)
882 secrets[i] = read_secret (greeter, &offset);
884 handle_continue_authentication (greeter, secrets);
885 for (i = 0; i < n_secrets; i++)
886 secure_free (greeter, secrets[i]);
889 case GREETER_MESSAGE_CANCEL_AUTHENTICATION:
890 handle_cancel_authentication (greeter);
892 case GREETER_MESSAGE_START_SESSION:
893 session_name = read_string (greeter, &offset);
894 handle_start_session (greeter, session_name);
895 g_free (session_name);
897 case GREETER_MESSAGE_SET_LANGUAGE:
898 language = read_string (greeter, &offset);
899 handle_set_language (greeter, language);
902 case GREETER_MESSAGE_ENSURE_SHARED_DIR:
903 username = read_string (greeter, &offset);
904 handle_ensure_shared_dir (greeter, username);
908 l_warning (greeter, "Unknown message from greeter: %d", id);
912 greeter->priv->n_read = 0;
918 greeter_get_guest_authenticated (Greeter *greeter)
920 g_return_val_if_fail (greeter != NULL, FALSE);
921 return greeter->priv->guest_account_authenticated;
925 greeter_get_authentication_session (Greeter *greeter)
927 g_return_val_if_fail (greeter != NULL, NULL);
928 return greeter->priv->authentication_session;
932 greeter_get_resettable (Greeter *greeter)
934 g_return_val_if_fail (greeter != NULL, FALSE);
935 return greeter->priv->resettable;
939 greeter_get_start_session (Greeter *greeter)
941 g_return_val_if_fail (greeter != NULL, FALSE);
942 return greeter->priv->start_session;
946 greeter_get_active_username (Greeter *greeter)
948 g_return_val_if_fail (greeter != NULL, NULL);
949 return greeter->priv->active_username;
953 greeter_start (Session *session)
955 Greeter *greeter = GREETER (session);
956 int to_greeter_pipe[2], from_greeter_pipe[2];
957 gboolean result = FALSE;
959 GError *error = NULL;
961 /* Create a pipe to talk with the greeter */
962 if (pipe (to_greeter_pipe) != 0 || pipe (from_greeter_pipe) != 0)
964 g_warning ("Failed to create pipes: %s", strerror (errno));
967 greeter->priv->to_greeter_channel = g_io_channel_unix_new (to_greeter_pipe[1]);
968 g_io_channel_set_encoding (greeter->priv->to_greeter_channel, NULL, &error);
970 g_warning ("Failed to set encoding on to greeter channel to binary: %s\n", error->message);
971 g_clear_error (&error);
972 greeter->priv->from_greeter_channel = g_io_channel_unix_new (from_greeter_pipe[0]);
973 g_io_channel_set_encoding (greeter->priv->from_greeter_channel, NULL, &error);
975 g_warning ("Failed to set encoding on from greeter channel to binary: %s\n", error->message);
976 g_clear_error (&error);
977 g_io_channel_set_buffered (greeter->priv->from_greeter_channel, FALSE);
978 greeter->priv->from_greeter_watch = g_io_add_watch (greeter->priv->from_greeter_channel, G_IO_IN | G_IO_HUP, read_cb, greeter);
980 /* Let the greeter session know how to communicate with the daemon */
981 value = g_strdup_printf ("%d", from_greeter_pipe[1]);
982 session_set_env (SESSION (greeter), "LIGHTDM_TO_SERVER_FD", value);
984 value = g_strdup_printf ("%d", to_greeter_pipe[0]);
985 session_set_env (SESSION (greeter), "LIGHTDM_FROM_SERVER_FD", value);
988 /* Don't allow the daemon end of the pipes to be accessed in child processes */
989 fcntl (to_greeter_pipe[1], F_SETFD, FD_CLOEXEC);
990 fcntl (from_greeter_pipe[0], F_SETFD, FD_CLOEXEC);
992 result = SESSION_CLASS (greeter_parent_class)->start (session);
994 /* Close the session ends of the pipe */
995 close (to_greeter_pipe[0]);
996 close (from_greeter_pipe[1]);
1002 greeter_real_create_session (Greeter *greeter)
1008 greeter_real_start_session (Greeter *greeter, SessionType type, const gchar *session)
1014 greeter_stop (Session *session)
1016 Greeter *greeter = GREETER (session);
1018 /* Stop any events occurring after we've stopped */
1019 if (greeter->priv->authentication_session)
1020 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
1022 SESSION_CLASS (greeter_parent_class)->stop (session);
1026 greeter_init (Greeter *greeter)
1028 greeter->priv = G_TYPE_INSTANCE_GET_PRIVATE (greeter, GREETER_TYPE, GreeterPrivate);
1029 greeter->priv->read_buffer = secure_malloc (greeter, HEADER_SIZE);
1030 greeter->priv->hints = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
1031 greeter->priv->use_secure_memory = config_get_boolean (config_get_instance (), "LightDM", "lock-memory");
1035 greeter_finalize (GObject *object)
1039 self = GREETER (object);
1041 g_free (self->priv->pam_service);
1042 g_free (self->priv->autologin_pam_service);
1043 secure_free (self, self->priv->read_buffer);
1044 g_hash_table_unref (self->priv->hints);
1045 g_free (self->priv->remote_session);
1046 g_free (self->priv->active_username);
1047 if (self->priv->authentication_session)
1049 g_signal_handlers_disconnect_matched (self->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1050 g_object_unref (self->priv->authentication_session);
1052 if (self->priv->to_greeter_channel)
1053 g_io_channel_unref (self->priv->to_greeter_channel);
1054 if (self->priv->from_greeter_channel)
1055 g_io_channel_unref (self->priv->from_greeter_channel);
1056 if (self->priv->from_greeter_watch)
1057 g_source_remove (self->priv->from_greeter_watch);
1059 G_OBJECT_CLASS (greeter_parent_class)->finalize (object);
1063 greeter_set_property (GObject *object,
1065 const GValue *value,
1068 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1072 greeter_get_property (GObject *object,
1077 Greeter *greeter = GREETER (object);
1080 case PROP_ACTIVE_USERNAME:
1081 g_value_set_string (value, greeter_get_active_username (greeter));
1084 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1090 greeter_class_init (GreeterClass *klass)
1092 SessionClass *session_class = SESSION_CLASS (klass);
1093 GObjectClass *object_class = G_OBJECT_CLASS (klass);
1095 klass->create_session = greeter_real_create_session;
1096 klass->start_session = greeter_real_start_session;
1097 session_class->start = greeter_start;
1098 session_class->stop = greeter_stop;
1099 object_class->finalize = greeter_finalize;
1100 object_class->get_property = greeter_get_property;
1101 object_class->set_property = greeter_set_property;
1103 signals[CONNECTED] =
1104 g_signal_new (GREETER_SIGNAL_CONNECTED,
1105 G_TYPE_FROM_CLASS (klass),
1107 G_STRUCT_OFFSET (GreeterClass, connected),
1112 signals[CREATE_SESSION] =
1113 g_signal_new (GREETER_SIGNAL_CREATE_SESSION,
1114 G_TYPE_FROM_CLASS (klass),
1116 G_STRUCT_OFFSET (GreeterClass, create_session),
1117 g_signal_accumulator_first_wins,
1122 signals[START_SESSION] =
1123 g_signal_new (GREETER_SIGNAL_START_SESSION,
1124 G_TYPE_FROM_CLASS (klass),
1126 G_STRUCT_OFFSET (GreeterClass, start_session),
1127 g_signal_accumulator_true_handled,
1130 G_TYPE_BOOLEAN, 2, G_TYPE_INT, G_TYPE_STRING);
1132 g_object_class_install_property (object_class,
1133 PROP_ACTIVE_USERNAME,
1134 g_param_spec_string (GREETER_PROPERTY_ACTIVE_USERNAME,
1135 GREETER_PROPERTY_ACTIVE_USERNAME,
1140 g_type_class_add_private (klass, sizeof (GreeterPrivate));