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 */
80 int from_greeter_output;
81 GIOChannel *to_greeter_channel;
82 GIOChannel *from_greeter_channel;
83 guint from_greeter_watch;
86 G_DEFINE_TYPE (Greeter, greeter, SESSION_TYPE);
88 /* Messages from the greeter to the server */
91 GREETER_MESSAGE_CONNECT = 0,
92 GREETER_MESSAGE_AUTHENTICATE,
93 GREETER_MESSAGE_AUTHENTICATE_AS_GUEST,
94 GREETER_MESSAGE_CONTINUE_AUTHENTICATION,
95 GREETER_MESSAGE_START_SESSION,
96 GREETER_MESSAGE_CANCEL_AUTHENTICATION,
97 GREETER_MESSAGE_SET_LANGUAGE,
98 GREETER_MESSAGE_AUTHENTICATE_REMOTE,
99 GREETER_MESSAGE_ENSURE_SHARED_DIR,
102 /* Messages from the server to the greeter */
105 SERVER_MESSAGE_CONNECTED = 0,
106 SERVER_MESSAGE_PROMPT_AUTHENTICATION,
107 SERVER_MESSAGE_END_AUTHENTICATION,
108 SERVER_MESSAGE_SESSION_RESULT,
109 SERVER_MESSAGE_SHARED_DIR_RESULT,
111 SERVER_MESSAGE_RESET,
114 static gboolean read_cb (GIOChannel *source, GIOCondition condition, gpointer data);
119 return g_object_new (GREETER_TYPE, NULL);
123 greeter_set_pam_services (Greeter *greeter, const gchar *pam_service, const gchar *autologin_pam_service)
125 g_free (greeter->priv->pam_service);
126 greeter->priv->pam_service = g_strdup (pam_service);
127 g_free (greeter->priv->autologin_pam_service);
128 greeter->priv->autologin_pam_service = g_strdup (autologin_pam_service);
132 greeter_set_allow_guest (Greeter *greeter, gboolean allow_guest)
134 greeter->priv->allow_guest = allow_guest;
138 greeter_clear_hints (Greeter *greeter)
140 g_hash_table_remove_all (greeter->priv->hints);
144 greeter_set_hint (Greeter *greeter, const gchar *name, const gchar *value)
146 g_hash_table_insert (greeter->priv->hints, g_strdup (name), g_strdup (value));
150 secure_malloc (Greeter *greeter, size_t n)
152 if (greeter->priv->use_secure_memory)
153 return gcry_malloc_secure (n);
159 secure_realloc (Greeter *greeter, void *ptr, size_t n)
161 if (greeter->priv->use_secure_memory)
162 return gcry_realloc (ptr, n);
164 return g_realloc (ptr, n);
168 secure_free (Greeter *greeter, void *ptr)
170 if (greeter->priv->use_secure_memory)
171 return gcry_free (ptr);
182 #define HEADER_SIZE (sizeof (guint32) * 2)
183 #define MAX_MESSAGE_LENGTH 1024
186 write_message (Greeter *greeter, guint8 *message, gsize message_length)
190 GError *error = NULL;
192 data = (gchar *) message;
193 data_length = message_length;
194 while (data_length > 0)
199 status = g_io_channel_write_chars (greeter->priv->to_greeter_channel, data, data_length, &n_written, &error);
201 l_warning (greeter, "Error writing to greeter: %s", error->message);
202 g_clear_error (&error);
203 if (status != G_IO_STATUS_NORMAL)
205 data_length -= n_written;
209 g_io_channel_flush (greeter->priv->to_greeter_channel, &error);
211 l_warning (greeter, "Failed to flush data to greeter: %s", error->message);
212 g_clear_error (&error);
216 write_int (guint8 *buffer, gint buffer_length, guint32 value, gsize *offset)
218 if (*offset + 4 >= buffer_length)
220 buffer[*offset] = value >> 24;
221 buffer[*offset+1] = (value >> 16) & 0xFF;
222 buffer[*offset+2] = (value >> 8) & 0xFF;
223 buffer[*offset+3] = value & 0xFF;
228 write_string (guint8 *buffer, gint buffer_length, const gchar *value, gsize *offset)
233 length = strlen (value);
236 write_int (buffer, buffer_length, length, offset);
237 if (*offset + length >= buffer_length)
241 memcpy (buffer + *offset, value, length);
247 write_header (guint8 *buffer, gint buffer_length, guint32 id, guint32 length, gsize *offset)
249 write_int (buffer, buffer_length, id, offset);
250 write_int (buffer, buffer_length, length, offset);
254 string_length (const gchar *value)
257 return int_length ();
259 return int_length () + strlen (value);
263 handle_connect (Greeter *greeter, const gchar *version, gboolean resettable)
265 guint8 message[MAX_MESSAGE_LENGTH];
271 l_debug (greeter, "Greeter connected version=%s resettable=%s", version, resettable ? "true" : "false");
273 greeter->priv->resettable = resettable;
275 length = string_length (VERSION);
276 g_hash_table_iter_init (&iter, greeter->priv->hints);
277 while (g_hash_table_iter_next (&iter, &key, &value))
278 length += string_length (key) + string_length (value);
280 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_CONNECTED, length, &offset);
281 write_string (message, MAX_MESSAGE_LENGTH, VERSION, &offset);
282 g_hash_table_iter_init (&iter, greeter->priv->hints);
283 while (g_hash_table_iter_next (&iter, &key, &value))
285 write_string (message, MAX_MESSAGE_LENGTH, key, &offset);
286 write_string (message, MAX_MESSAGE_LENGTH, value, &offset);
288 write_message (greeter, message, offset);
290 g_signal_emit (greeter, signals[CONNECTED], 0);
294 pam_messages_cb (Session *session, Greeter *greeter)
298 guint8 message[MAX_MESSAGE_LENGTH];
299 const struct pam_message *messages;
304 messages = session_get_messages (session);
305 messages_length = session_get_messages_length (session);
307 /* Respond to d-bus query with messages */
308 l_debug (greeter, "Prompt greeter with %d message(s)", messages_length);
309 size = int_length () + string_length (session_get_username (session)) + int_length ();
310 for (i = 0; i < messages_length; i++)
311 size += int_length () + string_length (messages[i].msg);
313 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_PROMPT_AUTHENTICATION, size, &offset);
314 write_int (message, MAX_MESSAGE_LENGTH, greeter->priv->authentication_sequence_number, &offset);
315 write_string (message, MAX_MESSAGE_LENGTH, session_get_username (session), &offset);
316 write_int (message, MAX_MESSAGE_LENGTH, messages_length, &offset);
317 for (i = 0; i < messages_length; i++)
319 write_int (message, MAX_MESSAGE_LENGTH, messages[i].msg_style, &offset);
320 write_string (message, MAX_MESSAGE_LENGTH, messages[i].msg, &offset);
322 if (messages[i].msg_style == PAM_PROMPT_ECHO_OFF || messages[i].msg_style == PAM_PROMPT_ECHO_ON)
325 write_message (greeter, message, offset);
327 /* Continue immediately if nothing to respond with */
328 // FIXME: Should probably give the greeter a chance to ack the message
331 struct pam_response *response;
332 response = calloc (messages_length, sizeof (struct pam_response));
333 session_respond (greeter->priv->authentication_session, response);
339 send_end_authentication (Greeter *greeter, guint32 sequence_number, const gchar *username, int result)
341 guint8 message[MAX_MESSAGE_LENGTH];
344 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_END_AUTHENTICATION, int_length () + string_length (username) + int_length (), &offset);
345 write_int (message, MAX_MESSAGE_LENGTH, sequence_number, &offset);
346 write_string (message, MAX_MESSAGE_LENGTH, username, &offset);
347 write_int (message, MAX_MESSAGE_LENGTH, result, &offset);
348 write_message (greeter, message, offset);
352 greeter_idle (Greeter *greeter)
354 guint8 message[MAX_MESSAGE_LENGTH];
357 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_IDLE, 0, &offset);
358 write_message (greeter, message, offset);
362 greeter_reset (Greeter *greeter)
364 guint8 message[MAX_MESSAGE_LENGTH];
370 g_hash_table_iter_init (&iter, greeter->priv->hints);
371 while (g_hash_table_iter_next (&iter, &key, &value))
372 length += string_length (key) + string_length (value);
374 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_RESET, length, &offset);
375 g_hash_table_iter_init (&iter, greeter->priv->hints);
376 while (g_hash_table_iter_next (&iter, &key, &value))
378 write_string (message, MAX_MESSAGE_LENGTH, key, &offset);
379 write_string (message, MAX_MESSAGE_LENGTH, value, &offset);
381 write_message (greeter, message, offset);
385 authentication_complete_cb (Session *session, Greeter *greeter)
389 l_debug (greeter, "Authenticate result for user %s: %s", session_get_username (session), session_get_authentication_result_string (session));
391 result = session_get_authentication_result (session);
392 if (session_get_is_authenticated (session))
394 if (session_get_user (session))
395 l_debug (greeter, "User %s authorized", session_get_username (session));
398 l_debug (greeter, "User %s authorized, but no account of that name exists", session_get_username (session));
399 result = PAM_USER_UNKNOWN;
403 send_end_authentication (greeter, greeter->priv->authentication_sequence_number, session_get_username (session), result);
407 reset_session (Greeter *greeter)
409 g_free (greeter->priv->remote_session);
410 greeter->priv->remote_session = NULL;
411 if (greeter->priv->authentication_session)
413 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
414 session_stop (greeter->priv->authentication_session);
415 g_object_unref (greeter->priv->authentication_session);
416 greeter->priv->authentication_session = NULL;
419 greeter->priv->guest_account_authenticated = FALSE;
423 handle_login (Greeter *greeter, guint32 sequence_number, const gchar *username)
425 const gchar *autologin_username, *service;
426 gboolean is_interactive;
428 if (username[0] == '\0')
430 l_debug (greeter, "Greeter start authentication");
434 l_debug (greeter, "Greeter start authentication for %s", username);
436 reset_session (greeter);
438 if (greeter->priv->active_username)
439 g_free (greeter->priv->active_username);
440 greeter->priv->active_username = g_strdup (username);
441 g_object_notify (G_OBJECT (greeter), GREETER_PROPERTY_ACTIVE_USERNAME);
443 greeter->priv->authentication_sequence_number = sequence_number;
444 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
445 if (!greeter->priv->authentication_session)
447 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
451 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_GOT_MESSAGES, G_CALLBACK (pam_messages_cb), greeter);
452 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_AUTHENTICATION_COMPLETE, G_CALLBACK (authentication_complete_cb), greeter);
454 /* Use non-interactive service for autologin user */
455 autologin_username = g_hash_table_lookup (greeter->priv->hints, "autologin-user");
456 if (autologin_username != NULL && g_strcmp0 (username, autologin_username) == 0)
458 service = greeter->priv->autologin_pam_service;
459 is_interactive = FALSE;
463 service = greeter->priv->pam_service;
464 is_interactive = TRUE;
467 /* Run the session process */
468 session_set_pam_service (greeter->priv->authentication_session, service);
469 session_set_username (greeter->priv->authentication_session, username);
470 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
471 session_set_is_interactive (greeter->priv->authentication_session, is_interactive);
472 session_start (greeter->priv->authentication_session);
476 handle_login_as_guest (Greeter *greeter, guint32 sequence_number)
478 l_debug (greeter, "Greeter start authentication for guest account");
480 reset_session (greeter);
482 if (!greeter->priv->allow_guest)
484 l_debug (greeter, "Guest account is disabled");
485 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
489 greeter->priv->guest_account_authenticated = TRUE;
490 send_end_authentication (greeter, sequence_number, "", PAM_SUCCESS);
494 get_remote_session_service (const gchar *session_name)
496 GKeyFile *session_desktop_file;
499 gchar *remote_sessions_dir, *filename, *path, *service = NULL;
500 GError *error = NULL;
502 /* Validate session name doesn't contain directory separators */
503 for (c = session_name; *c; c++)
509 /* Load the session file */
510 session_desktop_file = g_key_file_new ();
511 filename = g_strdup_printf ("%s.desktop", session_name);
512 remote_sessions_dir = config_get_string (config_get_instance (), "LightDM", "remote-sessions-directory");
513 path = g_build_filename (remote_sessions_dir, filename, NULL);
514 g_free (remote_sessions_dir);
516 result = g_key_file_load_from_file (session_desktop_file, path, G_KEY_FILE_NONE, &error);
518 g_debug ("Failed to load session file %s: %s", path, error->message);
520 g_clear_error (&error);
522 service = g_key_file_get_string (session_desktop_file, G_KEY_FILE_DESKTOP_GROUP, "X-LightDM-PAM-Service", NULL);
523 g_key_file_free (session_desktop_file);
529 handle_login_remote (Greeter *greeter, const gchar *session_name, const gchar *username, guint32 sequence_number)
533 if (username[0] == '\0')
535 l_debug (greeter, "Greeter start authentication for remote session %s", session_name);
539 l_debug (greeter, "Greeter start authentication for remote session %s as user %s", session_name, username);
541 reset_session (greeter);
543 service = get_remote_session_service (session_name);
546 send_end_authentication (greeter, sequence_number, "", PAM_SYSTEM_ERR);
550 greeter->priv->authentication_sequence_number = sequence_number;
551 greeter->priv->remote_session = g_strdup (session_name);
552 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
553 if (greeter->priv->authentication_session)
555 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_GOT_MESSAGES, G_CALLBACK (pam_messages_cb), greeter);
556 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_AUTHENTICATION_COMPLETE, G_CALLBACK (authentication_complete_cb), greeter);
558 /* Run the session process */
559 session_set_pam_service (greeter->priv->authentication_session, service);
560 session_set_username (greeter->priv->authentication_session, username);
561 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
562 session_set_is_interactive (greeter->priv->authentication_session, TRUE);
563 session_set_is_guest (greeter->priv->authentication_session, TRUE);
564 session_start (greeter->priv->authentication_session);
569 if (!greeter->priv->authentication_session)
571 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
577 handle_continue_authentication (Greeter *greeter, gchar **secrets)
580 const struct pam_message *messages;
581 struct pam_response *response;
582 int i, j, n_prompts = 0;
584 /* Not in authentication */
585 if (greeter->priv->authentication_session == NULL)
588 messages_length = session_get_messages_length (greeter->priv->authentication_session);
589 messages = session_get_messages (greeter->priv->authentication_session);
591 /* Check correct number of responses */
592 for (i = 0; i < messages_length; i++)
594 int msg_style = messages[i].msg_style;
595 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
598 if (g_strv_length (secrets) != n_prompts)
600 session_respond_error (greeter->priv->authentication_session, PAM_CONV_ERR);
604 l_debug (greeter, "Continue authentication");
607 response = calloc (messages_length, sizeof (struct pam_response));
608 for (i = 0, j = 0; i < messages_length; i++)
610 int msg_style = messages[i].msg_style;
611 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
613 size_t secret_length = strlen (secrets[j]) + 1;
614 response[i].resp = secure_malloc (greeter, secret_length);
615 memcpy (response[i].resp, secrets[j], secret_length); // FIXME: Need to convert from UTF-8
620 session_respond (greeter->priv->authentication_session, response);
622 for (i = 0; i < messages_length; i++)
623 secure_free (greeter, response[i].resp);
628 handle_cancel_authentication (Greeter *greeter)
630 /* Not in authentication */
631 if (greeter->priv->authentication_session == NULL)
634 l_debug (greeter, "Cancel authentication");
635 reset_session (greeter);
639 handle_start_session (Greeter *greeter, const gchar *session)
642 guint8 message[MAX_MESSAGE_LENGTH];
644 SessionType session_type = SESSION_TYPE_LOCAL;
646 if (strcmp (session, "") == 0)
649 /* Use session type chosen in remote session */
650 if (greeter->priv->remote_session)
652 session_type = SESSION_TYPE_REMOTE;
653 session = greeter->priv->remote_session;
656 if (greeter->priv->guest_account_authenticated || session_get_is_authenticated (greeter->priv->authentication_session))
659 l_debug (greeter, "Greeter requests session %s", session);
661 l_debug (greeter, "Greeter requests default session");
662 greeter->priv->start_session = TRUE;
663 g_signal_emit (greeter, signals[START_SESSION], 0, session_type, session, &result);
667 l_debug (greeter, "Ignoring start session request, user is not authorized");
671 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SESSION_RESULT, int_length (), &offset);
672 write_int (message, MAX_MESSAGE_LENGTH, result ? 0 : 1, &offset);
673 write_message (greeter, message, offset);
677 handle_set_language (Greeter *greeter, const gchar *language)
681 if (!greeter->priv->guest_account_authenticated && !session_get_is_authenticated (greeter->priv->authentication_session))
683 l_debug (greeter, "Ignoring set language request, user is not authorized");
687 // FIXME: Could use this
688 if (greeter->priv->guest_account_authenticated)
690 l_debug (greeter, "Ignoring set language request for guest user");
694 l_debug (greeter, "Greeter sets language %s", language);
695 user = session_get_user (greeter->priv->authentication_session);
696 user_set_language (user, language);
700 handle_ensure_shared_dir (Greeter *greeter, const gchar *username)
703 guint8 message[MAX_MESSAGE_LENGTH];
706 l_debug (greeter, "Greeter requests data directory for user %s", username);
708 dir = shared_data_manager_ensure_user_dir (shared_data_manager_get_instance (), username);
710 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SHARED_DIR_RESULT, string_length (dir), &offset);
711 write_string (message, MAX_MESSAGE_LENGTH, dir, &offset);
712 write_message (greeter, message, offset);
718 read_int (Greeter *greeter, gsize *offset)
722 if (greeter->priv->n_read - *offset < sizeof (guint32))
724 l_warning (greeter, "Not enough space for int, need %zu, got %zu", sizeof (guint32), greeter->priv->n_read - *offset);
727 buffer = greeter->priv->read_buffer + *offset;
728 value = buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3];
729 *offset += int_length ();
734 get_message_length (Greeter *greeter)
739 offset = int_length ();
740 payload_length = read_int (greeter, &offset);
742 if (HEADER_SIZE + payload_length < HEADER_SIZE)
744 l_warning (greeter, "Payload length of %u octets too long", payload_length);
748 return HEADER_SIZE + payload_length;
752 read_string_full (Greeter *greeter, gsize *offset, void* (*alloc_fn)(size_t n))
757 length = read_int (greeter, offset);
758 if (greeter->priv->n_read - *offset < length)
760 l_warning (greeter, "Not enough space for string, need %u, got %zu", length, greeter->priv->n_read - *offset);
761 return g_strdup ("");
764 value = (*alloc_fn) (sizeof (gchar) * (length + 1));
765 memcpy (value, greeter->priv->read_buffer + *offset, length);
766 value[length] = '\0';
773 read_string (Greeter *greeter, gsize *offset)
775 return read_string_full (greeter, offset, g_malloc);
779 read_secret (Greeter *greeter, gsize *offset)
781 if (greeter->priv->use_secure_memory)
782 return read_string_full (greeter, offset, gcry_malloc_secure);
784 return read_string_full (greeter, offset, g_malloc);
788 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
790 Greeter *greeter = data;
791 gsize n_to_read, n_read, offset;
794 guint32 sequence_number, n_secrets, max_secrets;
795 gchar *version, *username, *session_name, *language;
797 gboolean resettable = FALSE;
798 GError *error = NULL;
800 if (condition == G_IO_HUP)
802 l_debug (greeter, "Greeter closed communication channel");
803 greeter->priv->from_greeter_watch = 0;
807 n_to_read = HEADER_SIZE;
808 if (greeter->priv->n_read >= HEADER_SIZE)
810 n_to_read = get_message_length (greeter);
811 if (n_to_read <= HEADER_SIZE)
813 greeter->priv->from_greeter_watch = 0;
818 status = g_io_channel_read_chars (greeter->priv->from_greeter_channel,
819 (gchar *) greeter->priv->read_buffer + greeter->priv->n_read,
820 n_to_read - greeter->priv->n_read,
824 l_warning (greeter, "Error reading from greeter: %s", error->message);
825 g_clear_error (&error);
826 if (status != G_IO_STATUS_NORMAL)
829 greeter->priv->n_read += n_read;
830 if (greeter->priv->n_read != n_to_read)
833 /* If have header, rerun for content */
834 if (greeter->priv->n_read == HEADER_SIZE)
836 n_to_read = get_message_length (greeter);
837 if (n_to_read > HEADER_SIZE)
839 greeter->priv->read_buffer = secure_realloc (greeter, greeter->priv->read_buffer, n_to_read);
840 read_cb (source, condition, greeter);
846 id = read_int (greeter, &offset);
847 length = HEADER_SIZE + read_int (greeter, &offset);
850 case GREETER_MESSAGE_CONNECT:
851 version = read_string (greeter, &offset);
853 resettable = read_int (greeter, &offset) != 0;
854 handle_connect (greeter, version, resettable);
857 case GREETER_MESSAGE_AUTHENTICATE:
858 sequence_number = read_int (greeter, &offset);
859 username = read_string (greeter, &offset);
860 handle_login (greeter, sequence_number, username);
863 case GREETER_MESSAGE_AUTHENTICATE_AS_GUEST:
864 sequence_number = read_int (greeter, &offset);
865 handle_login_as_guest (greeter, sequence_number);
867 case GREETER_MESSAGE_AUTHENTICATE_REMOTE:
868 sequence_number = read_int (greeter, &offset);
869 session_name = read_string (greeter, &offset);
870 username = read_string (greeter, &offset);
871 handle_login_remote (greeter, session_name, username, sequence_number);
873 case GREETER_MESSAGE_CONTINUE_AUTHENTICATION:
874 n_secrets = read_int (greeter, &offset);
875 max_secrets = (G_MAXUINT32 - 1) / sizeof (gchar *);
876 if (n_secrets > max_secrets)
878 l_warning (greeter, "Array length of %u elements too long", n_secrets);
879 greeter->priv->from_greeter_watch = 0;
882 secrets = g_malloc (sizeof (gchar *) * (n_secrets + 1));
883 for (i = 0; i < n_secrets; i++)
884 secrets[i] = read_secret (greeter, &offset);
886 handle_continue_authentication (greeter, secrets);
887 for (i = 0; i < n_secrets; i++)
888 secure_free (greeter, secrets[i]);
891 case GREETER_MESSAGE_CANCEL_AUTHENTICATION:
892 handle_cancel_authentication (greeter);
894 case GREETER_MESSAGE_START_SESSION:
895 session_name = read_string (greeter, &offset);
896 handle_start_session (greeter, session_name);
897 g_free (session_name);
899 case GREETER_MESSAGE_SET_LANGUAGE:
900 language = read_string (greeter, &offset);
901 handle_set_language (greeter, language);
904 case GREETER_MESSAGE_ENSURE_SHARED_DIR:
905 username = read_string (greeter, &offset);
906 handle_ensure_shared_dir (greeter, username);
910 l_warning (greeter, "Unknown message from greeter: %d", id);
914 greeter->priv->n_read = 0;
920 greeter_get_guest_authenticated (Greeter *greeter)
922 g_return_val_if_fail (greeter != NULL, FALSE);
923 return greeter->priv->guest_account_authenticated;
927 greeter_get_authentication_session (Greeter *greeter)
929 g_return_val_if_fail (greeter != NULL, NULL);
930 return greeter->priv->authentication_session;
934 greeter_get_resettable (Greeter *greeter)
936 g_return_val_if_fail (greeter != NULL, FALSE);
937 return greeter->priv->resettable;
941 greeter_get_start_session (Greeter *greeter)
943 g_return_val_if_fail (greeter != NULL, FALSE);
944 return greeter->priv->start_session;
948 greeter_get_active_username (Greeter *greeter)
950 g_return_val_if_fail (greeter != NULL, NULL);
951 return greeter->priv->active_username;
955 greeter_start (Session *session)
957 Greeter *greeter = GREETER (session);
958 int to_greeter_pipe[2], from_greeter_pipe[2];
959 int to_greeter_output, from_greeter_input;
960 gboolean result = FALSE;
962 GError *error = NULL;
964 /* Create a pipe to talk with the greeter */
965 if (pipe (to_greeter_pipe) != 0 || pipe (from_greeter_pipe) != 0)
967 g_warning ("Failed to create pipes: %s", strerror (errno));
970 to_greeter_output = to_greeter_pipe[0];
971 greeter->priv->to_greeter_input = to_greeter_pipe[1];
972 greeter->priv->to_greeter_channel = g_io_channel_unix_new (greeter->priv->to_greeter_input);
973 g_io_channel_set_encoding (greeter->priv->to_greeter_channel, NULL, &error);
975 g_warning ("Failed to set encoding on to greeter channel to binary: %s\n", error->message);
976 g_clear_error (&error);
977 greeter->priv->from_greeter_output = from_greeter_pipe[0];
978 from_greeter_input = from_greeter_pipe[1];
979 greeter->priv->from_greeter_channel = g_io_channel_unix_new (greeter->priv->from_greeter_output);
980 g_io_channel_set_encoding (greeter->priv->from_greeter_channel, NULL, &error);
982 g_warning ("Failed to set encoding on from greeter channel to binary: %s\n", error->message);
983 g_clear_error (&error);
984 g_io_channel_set_buffered (greeter->priv->from_greeter_channel, FALSE);
985 greeter->priv->from_greeter_watch = g_io_add_watch (greeter->priv->from_greeter_channel, G_IO_IN | G_IO_HUP, read_cb, greeter);
987 /* Let the greeter session know how to communicate with the daemon */
988 value = g_strdup_printf ("%d", from_greeter_input);
989 session_set_env (SESSION (greeter), "LIGHTDM_TO_SERVER_FD", value);
991 value = g_strdup_printf ("%d", to_greeter_output);
992 session_set_env (SESSION (greeter), "LIGHTDM_FROM_SERVER_FD", value);
995 /* Don't allow the daemon end of the pipes to be accessed in child processes */
996 fcntl (greeter->priv->to_greeter_input, F_SETFD, FD_CLOEXEC);
997 fcntl (greeter->priv->from_greeter_output, F_SETFD, FD_CLOEXEC);
999 result = SESSION_CLASS (greeter_parent_class)->start (session);
1001 /* Close the session ends of the pipe */
1002 close (to_greeter_output);
1003 close (from_greeter_input);
1009 greeter_real_create_session (Greeter *greeter)
1015 greeter_real_start_session (Greeter *greeter, SessionType type, const gchar *session)
1021 greeter_stop (Session *session)
1023 Greeter *greeter = GREETER (session);
1025 /* Stop any events occurring after we've stopped */
1026 if (greeter->priv->authentication_session)
1027 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
1029 SESSION_CLASS (greeter_parent_class)->stop (session);
1033 greeter_init (Greeter *greeter)
1035 greeter->priv = G_TYPE_INSTANCE_GET_PRIVATE (greeter, GREETER_TYPE, GreeterPrivate);
1036 greeter->priv->read_buffer = secure_malloc (greeter, HEADER_SIZE);
1037 greeter->priv->hints = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
1038 greeter->priv->use_secure_memory = config_get_boolean (config_get_instance (), "LightDM", "lock-memory");
1039 greeter->priv->to_greeter_input = -1;
1040 greeter->priv->from_greeter_output = -1;
1044 greeter_finalize (GObject *object)
1048 self = GREETER (object);
1050 g_free (self->priv->pam_service);
1051 g_free (self->priv->autologin_pam_service);
1052 secure_free (self, self->priv->read_buffer);
1053 g_hash_table_unref (self->priv->hints);
1054 g_free (self->priv->remote_session);
1055 g_free (self->priv->active_username);
1056 if (self->priv->authentication_session)
1058 g_signal_handlers_disconnect_matched (self->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1059 g_object_unref (self->priv->authentication_session);
1061 close (self->priv->to_greeter_input);
1062 close (self->priv->from_greeter_output);
1063 if (self->priv->to_greeter_channel)
1064 g_io_channel_unref (self->priv->to_greeter_channel);
1065 if (self->priv->from_greeter_channel)
1066 g_io_channel_unref (self->priv->from_greeter_channel);
1067 if (self->priv->from_greeter_watch)
1068 g_source_remove (self->priv->from_greeter_watch);
1070 G_OBJECT_CLASS (greeter_parent_class)->finalize (object);
1074 greeter_set_property (GObject *object,
1076 const GValue *value,
1079 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1083 greeter_get_property (GObject *object,
1088 Greeter *greeter = GREETER (object);
1091 case PROP_ACTIVE_USERNAME:
1092 g_value_set_string (value, greeter_get_active_username (greeter));
1095 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1101 greeter_class_init (GreeterClass *klass)
1103 SessionClass *session_class = SESSION_CLASS (klass);
1104 GObjectClass *object_class = G_OBJECT_CLASS (klass);
1106 klass->create_session = greeter_real_create_session;
1107 klass->start_session = greeter_real_start_session;
1108 session_class->start = greeter_start;
1109 session_class->stop = greeter_stop;
1110 object_class->finalize = greeter_finalize;
1111 object_class->get_property = greeter_get_property;
1112 object_class->set_property = greeter_set_property;
1114 signals[CONNECTED] =
1115 g_signal_new (GREETER_SIGNAL_CONNECTED,
1116 G_TYPE_FROM_CLASS (klass),
1118 G_STRUCT_OFFSET (GreeterClass, connected),
1123 signals[CREATE_SESSION] =
1124 g_signal_new (GREETER_SIGNAL_CREATE_SESSION,
1125 G_TYPE_FROM_CLASS (klass),
1127 G_STRUCT_OFFSET (GreeterClass, create_session),
1128 g_signal_accumulator_first_wins,
1133 signals[START_SESSION] =
1134 g_signal_new (GREETER_SIGNAL_START_SESSION,
1135 G_TYPE_FROM_CLASS (klass),
1137 G_STRUCT_OFFSET (GreeterClass, start_session),
1138 g_signal_accumulator_true_handled,
1141 G_TYPE_BOOLEAN, 2, G_TYPE_INT, G_TYPE_STRING);
1143 g_object_class_install_property (object_class,
1144 PROP_ACTIVE_USERNAME,
1145 g_param_spec_string (GREETER_PROPERTY_ACTIVE_USERNAME,
1146 GREETER_PROPERTY_ACTIVE_USERNAME,
1151 g_type_class_add_private (klass, sizeof (GreeterPrivate));