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 user has been authenticated and the session requested to start */
67 gboolean start_session;
69 /* TRUE if can log into guest accounts */
72 /* TRUE if logging into guest session */
73 gboolean guest_account_authenticated;
75 /* Communication channels to communicate with */
76 GIOChannel *to_greeter_channel;
77 GIOChannel *from_greeter_channel;
78 guint from_greeter_watch;
81 G_DEFINE_TYPE (Greeter, greeter, SESSION_TYPE);
83 /* Messages from the greeter to the server */
86 GREETER_MESSAGE_CONNECT = 0,
87 GREETER_MESSAGE_AUTHENTICATE,
88 GREETER_MESSAGE_AUTHENTICATE_AS_GUEST,
89 GREETER_MESSAGE_CONTINUE_AUTHENTICATION,
90 GREETER_MESSAGE_START_SESSION,
91 GREETER_MESSAGE_CANCEL_AUTHENTICATION,
92 GREETER_MESSAGE_SET_LANGUAGE,
93 GREETER_MESSAGE_AUTHENTICATE_REMOTE,
94 GREETER_MESSAGE_ENSURE_SHARED_DIR,
97 /* Messages from the server to the greeter */
100 SERVER_MESSAGE_CONNECTED = 0,
101 SERVER_MESSAGE_PROMPT_AUTHENTICATION,
102 SERVER_MESSAGE_END_AUTHENTICATION,
103 SERVER_MESSAGE_SESSION_RESULT,
104 SERVER_MESSAGE_SHARED_DIR_RESULT,
107 static gboolean read_cb (GIOChannel *source, GIOCondition condition, gpointer data);
112 return g_object_new (GREETER_TYPE, NULL);
116 greeter_set_pam_services (Greeter *greeter, const gchar *pam_service, const gchar *autologin_pam_service)
118 g_free (greeter->priv->pam_service);
119 greeter->priv->pam_service = g_strdup (pam_service);
120 g_free (greeter->priv->autologin_pam_service);
121 greeter->priv->autologin_pam_service = g_strdup (autologin_pam_service);
125 greeter_set_allow_guest (Greeter *greeter, gboolean allow_guest)
127 greeter->priv->allow_guest = allow_guest;
131 greeter_set_hint (Greeter *greeter, const gchar *name, const gchar *value)
133 g_hash_table_insert (greeter->priv->hints, g_strdup (name), g_strdup (value));
137 secure_malloc (Greeter *greeter, size_t n)
139 if (greeter->priv->use_secure_memory)
140 return gcry_malloc_secure (n);
146 secure_realloc (Greeter *greeter, void *ptr, size_t n)
148 if (greeter->priv->use_secure_memory)
149 return gcry_realloc (ptr, n);
151 return g_realloc (ptr, n);
155 secure_free (Greeter *greeter, void *ptr)
157 if (greeter->priv->use_secure_memory)
158 return gcry_free (ptr);
169 #define HEADER_SIZE (sizeof (guint32) * 2)
170 #define MAX_MESSAGE_LENGTH 1024
173 write_message (Greeter *greeter, guint8 *message, gsize message_length)
175 GError *error = NULL;
177 g_io_channel_write_chars (greeter->priv->to_greeter_channel, (gchar *) message, message_length, NULL, &error);
179 l_warning (greeter, "Error writing to greeter: %s", error->message);
180 g_clear_error (&error);
181 g_io_channel_flush (greeter->priv->to_greeter_channel, NULL);
185 write_int (guint8 *buffer, gint buffer_length, guint32 value, gsize *offset)
187 if (*offset + 4 >= buffer_length)
189 buffer[*offset] = value >> 24;
190 buffer[*offset+1] = (value >> 16) & 0xFF;
191 buffer[*offset+2] = (value >> 8) & 0xFF;
192 buffer[*offset+3] = value & 0xFF;
197 write_string (guint8 *buffer, gint buffer_length, const gchar *value, gsize *offset)
202 length = strlen (value);
205 write_int (buffer, buffer_length, length, offset);
206 if (*offset + length >= buffer_length)
210 memcpy (buffer + *offset, value, length);
216 write_header (guint8 *buffer, gint buffer_length, guint32 id, guint32 length, gsize *offset)
218 write_int (buffer, buffer_length, id, offset);
219 write_int (buffer, buffer_length, length, offset);
223 string_length (const gchar *value)
226 return int_length ();
228 return int_length () + strlen (value);
232 handle_connect (Greeter *greeter, const gchar *version)
234 guint8 message[MAX_MESSAGE_LENGTH];
240 l_debug (greeter, "Greeter connected version=%s", version);
242 length = string_length (VERSION);
243 g_hash_table_iter_init (&iter, greeter->priv->hints);
244 while (g_hash_table_iter_next (&iter, &key, &value))
245 length += string_length (key) + string_length (value);
247 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_CONNECTED, length, &offset);
248 write_string (message, MAX_MESSAGE_LENGTH, VERSION, &offset);
249 g_hash_table_iter_init (&iter, greeter->priv->hints);
250 while (g_hash_table_iter_next (&iter, &key, &value))
252 write_string (message, MAX_MESSAGE_LENGTH, key, &offset);
253 write_string (message, MAX_MESSAGE_LENGTH, value, &offset);
255 write_message (greeter, message, offset);
257 g_signal_emit (greeter, signals[CONNECTED], 0);
261 pam_messages_cb (Session *session, Greeter *greeter)
265 guint8 message[MAX_MESSAGE_LENGTH];
266 const struct pam_message *messages;
271 messages = session_get_messages (session);
272 messages_length = session_get_messages_length (session);
274 /* Respond to d-bus query with messages */
275 l_debug (greeter, "Prompt greeter with %d message(s)", messages_length);
276 size = int_length () + string_length (session_get_username (session)) + int_length ();
277 for (i = 0; i < messages_length; i++)
278 size += int_length () + string_length (messages[i].msg);
280 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_PROMPT_AUTHENTICATION, size, &offset);
281 write_int (message, MAX_MESSAGE_LENGTH, greeter->priv->authentication_sequence_number, &offset);
282 write_string (message, MAX_MESSAGE_LENGTH, session_get_username (session), &offset);
283 write_int (message, MAX_MESSAGE_LENGTH, messages_length, &offset);
284 for (i = 0; i < messages_length; i++)
286 write_int (message, MAX_MESSAGE_LENGTH, messages[i].msg_style, &offset);
287 write_string (message, MAX_MESSAGE_LENGTH, messages[i].msg, &offset);
289 if (messages[i].msg_style == PAM_PROMPT_ECHO_OFF || messages[i].msg_style == PAM_PROMPT_ECHO_ON)
292 write_message (greeter, message, offset);
294 /* Continue immediately if nothing to respond with */
295 // FIXME: Should probably give the greeter a chance to ack the message
298 struct pam_response *response;
299 response = calloc (messages_length, sizeof (struct pam_response));
300 session_respond (greeter->priv->authentication_session, response);
306 send_end_authentication (Greeter *greeter, guint32 sequence_number, const gchar *username, int result)
308 guint8 message[MAX_MESSAGE_LENGTH];
311 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_END_AUTHENTICATION, int_length () + string_length (username) + int_length (), &offset);
312 write_int (message, MAX_MESSAGE_LENGTH, sequence_number, &offset);
313 write_string (message, MAX_MESSAGE_LENGTH, username, &offset);
314 write_int (message, MAX_MESSAGE_LENGTH, result, &offset);
315 write_message (greeter, message, offset);
319 authentication_complete_cb (Session *session, Greeter *greeter)
323 l_debug (greeter, "Authenticate result for user %s: %s", session_get_username (session), session_get_authentication_result_string (session));
325 result = session_get_authentication_result (session);
326 if (session_get_is_authenticated (session))
328 if (session_get_user (session))
329 l_debug (greeter, "User %s authorized", session_get_username (session));
332 l_debug (greeter, "User %s authorized, but no account of that name exists", session_get_username (session));
333 result = PAM_USER_UNKNOWN;
337 send_end_authentication (greeter, greeter->priv->authentication_sequence_number, session_get_username (session), result);
341 reset_session (Greeter *greeter)
343 g_free (greeter->priv->remote_session);
344 greeter->priv->remote_session = NULL;
345 if (greeter->priv->authentication_session)
347 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
348 session_stop (greeter->priv->authentication_session);
349 g_object_unref (greeter->priv->authentication_session);
350 greeter->priv->authentication_session = NULL;
353 greeter->priv->guest_account_authenticated = FALSE;
357 handle_login (Greeter *greeter, guint32 sequence_number, const gchar *username)
359 const gchar *autologin_username, *service;
360 gboolean is_interactive;
362 if (username[0] == '\0')
364 l_debug (greeter, "Greeter start authentication");
368 l_debug (greeter, "Greeter start authentication for %s", username);
370 reset_session (greeter);
372 if (greeter->priv->active_username)
373 g_free (greeter->priv->active_username);
374 greeter->priv->active_username = g_strdup (username);
375 g_object_notify (G_OBJECT (greeter), "active-username");
377 greeter->priv->authentication_sequence_number = sequence_number;
378 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
379 if (!greeter->priv->authentication_session)
381 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
385 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), "got-messages", G_CALLBACK (pam_messages_cb), greeter);
386 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), "authentication-complete", G_CALLBACK (authentication_complete_cb), greeter);
388 /* Use non-interactive service for autologin user */
389 autologin_username = g_hash_table_lookup (greeter->priv->hints, "autologin-user");
390 if (autologin_username != NULL && g_strcmp0 (username, autologin_username) == 0)
392 service = greeter->priv->autologin_pam_service;
393 is_interactive = FALSE;
397 service = greeter->priv->pam_service;
398 is_interactive = TRUE;
401 /* Run the session process */
402 session_set_pam_service (greeter->priv->authentication_session, service);
403 session_set_username (greeter->priv->authentication_session, username);
404 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
405 session_set_is_interactive (greeter->priv->authentication_session, is_interactive);
406 session_start (greeter->priv->authentication_session);
410 handle_login_as_guest (Greeter *greeter, guint32 sequence_number)
412 l_debug (greeter, "Greeter start authentication for guest account");
414 reset_session (greeter);
416 if (!greeter->priv->allow_guest)
418 l_debug (greeter, "Guest account is disabled");
419 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
423 greeter->priv->guest_account_authenticated = TRUE;
424 send_end_authentication (greeter, sequence_number, "", PAM_SUCCESS);
428 get_remote_session_service (const gchar *session_name)
430 GKeyFile *session_desktop_file;
433 gchar *remote_sessions_dir, *filename, *path, *service = NULL;
434 GError *error = NULL;
436 /* Validate session name doesn't contain directory separators */
437 for (c = session_name; *c; c++)
443 /* Load the session file */
444 session_desktop_file = g_key_file_new ();
445 filename = g_strdup_printf ("%s.desktop", session_name);
446 remote_sessions_dir = config_get_string (config_get_instance (), "LightDM", "remote-sessions-directory");
447 path = g_build_filename (remote_sessions_dir, filename, NULL);
448 g_free (remote_sessions_dir);
450 result = g_key_file_load_from_file (session_desktop_file, path, G_KEY_FILE_NONE, &error);
452 g_debug ("Failed to load session file %s: %s", path, error->message);
454 g_clear_error (&error);
456 service = g_key_file_get_string (session_desktop_file, G_KEY_FILE_DESKTOP_GROUP, "X-LightDM-PAM-Service", NULL);
457 g_key_file_free (session_desktop_file);
463 handle_login_remote (Greeter *greeter, const gchar *session_name, const gchar *username, guint32 sequence_number)
467 if (username[0] == '\0')
469 l_debug (greeter, "Greeter start authentication for remote session %s", session_name);
473 l_debug (greeter, "Greeter start authentication for remote session %s as user %s", session_name, username);
475 reset_session (greeter);
477 service = get_remote_session_service (session_name);
480 send_end_authentication (greeter, sequence_number, "", PAM_SYSTEM_ERR);
484 greeter->priv->authentication_sequence_number = sequence_number;
485 greeter->priv->remote_session = g_strdup (session_name);
486 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
487 if (greeter->priv->authentication_session)
489 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), "got-messages", G_CALLBACK (pam_messages_cb), greeter);
490 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), "authentication-complete", G_CALLBACK (authentication_complete_cb), greeter);
492 /* Run the session process */
493 session_set_pam_service (greeter->priv->authentication_session, service);
494 session_set_username (greeter->priv->authentication_session, username);
495 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
496 session_set_is_interactive (greeter->priv->authentication_session, TRUE);
497 session_set_is_guest (greeter->priv->authentication_session, TRUE);
498 session_start (greeter->priv->authentication_session);
503 if (!greeter->priv->authentication_session)
505 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
511 handle_continue_authentication (Greeter *greeter, gchar **secrets)
514 const struct pam_message *messages;
515 struct pam_response *response;
516 int i, j, n_prompts = 0;
518 /* Not in authentication */
519 if (greeter->priv->authentication_session == NULL)
522 messages_length = session_get_messages_length (greeter->priv->authentication_session);
523 messages = session_get_messages (greeter->priv->authentication_session);
525 /* Check correct number of responses */
526 for (i = 0; i < messages_length; i++)
528 int msg_style = messages[i].msg_style;
529 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
532 if (g_strv_length (secrets) != n_prompts)
534 session_respond_error (greeter->priv->authentication_session, PAM_CONV_ERR);
538 l_debug (greeter, "Continue authentication");
541 response = calloc (messages_length, sizeof (struct pam_response));
542 for (i = 0, j = 0; i < messages_length; i++)
544 int msg_style = messages[i].msg_style;
545 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
547 size_t secret_length = strlen (secrets[j]) + 1;
548 response[i].resp = secure_malloc (greeter, secret_length);
549 memcpy (response[i].resp, secrets[j], secret_length); // FIXME: Need to convert from UTF-8
554 session_respond (greeter->priv->authentication_session, response);
556 for (i = 0; i < messages_length; i++)
557 secure_free (greeter, response[i].resp);
562 handle_cancel_authentication (Greeter *greeter)
564 /* Not in authentication */
565 if (greeter->priv->authentication_session == NULL)
568 l_debug (greeter, "Cancel authentication");
569 reset_session (greeter);
573 handle_start_session (Greeter *greeter, const gchar *session)
576 guint8 message[MAX_MESSAGE_LENGTH];
578 SessionType session_type = SESSION_TYPE_LOCAL;
580 if (strcmp (session, "") == 0)
583 /* Use session type chosen in remote session */
584 if (greeter->priv->remote_session)
586 session_type = SESSION_TYPE_REMOTE;
587 session = greeter->priv->remote_session;
590 if (greeter->priv->guest_account_authenticated || session_get_is_authenticated (greeter->priv->authentication_session))
593 l_debug (greeter, "Greeter requests session %s", session);
595 l_debug (greeter, "Greeter requests default session");
596 greeter->priv->start_session = TRUE;
597 g_signal_emit (greeter, signals[START_SESSION], 0, session_type, session, &result);
601 l_debug (greeter, "Ignoring start session request, user is not authorized");
605 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SESSION_RESULT, int_length (), &offset);
606 write_int (message, MAX_MESSAGE_LENGTH, result ? 0 : 1, &offset);
607 write_message (greeter, message, offset);
611 handle_set_language (Greeter *greeter, const gchar *language)
615 if (!greeter->priv->guest_account_authenticated && !session_get_is_authenticated (greeter->priv->authentication_session))
617 l_debug (greeter, "Ignoring set language request, user is not authorized");
621 // FIXME: Could use this
622 if (greeter->priv->guest_account_authenticated)
624 l_debug (greeter, "Ignoring set language request for guest user");
628 l_debug (greeter, "Greeter sets language %s", language);
629 user = session_get_user (greeter->priv->authentication_session);
630 user_set_language (user, language);
634 handle_ensure_shared_dir (Greeter *greeter, const gchar *username)
637 guint8 message[MAX_MESSAGE_LENGTH];
640 result = shared_data_manager_ensure_user_dir (shared_data_manager_get_instance (), username);
642 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SHARED_DIR_RESULT, int_length (), &offset);
643 write_int (message, MAX_MESSAGE_LENGTH, result ? 0 : 1, &offset);
644 write_message (greeter, message, offset);
648 read_int (Greeter *greeter, gsize *offset)
652 if (greeter->priv->n_read - *offset < sizeof (guint32))
654 l_warning (greeter, "Not enough space for int, need %zu, got %zu", sizeof (guint32), greeter->priv->n_read - *offset);
657 buffer = greeter->priv->read_buffer + *offset;
658 value = buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3];
659 *offset += int_length ();
664 get_message_length (Greeter *greeter)
669 offset = int_length ();
670 payload_length = read_int (greeter, &offset);
672 if (HEADER_SIZE + payload_length < HEADER_SIZE)
674 l_warning (greeter, "Payload length of %u octets too long", payload_length);
678 return HEADER_SIZE + payload_length;
682 read_string_full (Greeter *greeter, gsize *offset, void* (*alloc_fn)(size_t n))
687 length = read_int (greeter, offset);
688 if (greeter->priv->n_read - *offset < length)
690 l_warning (greeter, "Not enough space for string, need %u, got %zu", length, greeter->priv->n_read - *offset);
691 return g_strdup ("");
694 value = (*alloc_fn) (sizeof (gchar) * (length + 1));
695 memcpy (value, greeter->priv->read_buffer + *offset, length);
696 value[length] = '\0';
703 read_string (Greeter *greeter, gsize *offset)
705 return read_string_full (greeter, offset, g_malloc);
709 read_secret (Greeter *greeter, gsize *offset)
711 if (greeter->priv->use_secure_memory)
712 return read_string_full (greeter, offset, gcry_malloc_secure);
714 return read_string_full (greeter, offset, g_malloc);
718 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
720 Greeter *greeter = data;
721 gsize n_to_read, n_read, offset;
724 guint32 sequence_number, n_secrets, max_secrets;
725 gchar *version, *username, *session_name, *language;
727 GError *error = NULL;
729 if (condition == G_IO_HUP)
731 l_debug (greeter, "Greeter closed communication channel");
732 greeter->priv->from_greeter_watch = 0;
736 n_to_read = HEADER_SIZE;
737 if (greeter->priv->n_read >= HEADER_SIZE)
739 n_to_read = get_message_length (greeter);
740 if (n_to_read <= HEADER_SIZE)
742 greeter->priv->from_greeter_watch = 0;
747 status = g_io_channel_read_chars (greeter->priv->from_greeter_channel,
748 (gchar *) greeter->priv->read_buffer + greeter->priv->n_read,
749 n_to_read - greeter->priv->n_read,
753 l_warning (greeter, "Error reading from greeter: %s", error->message);
754 g_clear_error (&error);
755 if (status != G_IO_STATUS_NORMAL)
758 greeter->priv->n_read += n_read;
759 if (greeter->priv->n_read != n_to_read)
762 /* If have header, rerun for content */
763 if (greeter->priv->n_read == HEADER_SIZE)
765 n_to_read = get_message_length (greeter);
766 if (n_to_read > HEADER_SIZE)
768 greeter->priv->read_buffer = secure_realloc (greeter, greeter->priv->read_buffer, n_to_read);
769 read_cb (source, condition, greeter);
775 id = read_int (greeter, &offset);
776 read_int (greeter, &offset);
779 case GREETER_MESSAGE_CONNECT:
780 version = read_string (greeter, &offset);
781 handle_connect (greeter, version);
784 case GREETER_MESSAGE_AUTHENTICATE:
785 sequence_number = read_int (greeter, &offset);
786 username = read_string (greeter, &offset);
787 handle_login (greeter, sequence_number, username);
790 case GREETER_MESSAGE_AUTHENTICATE_AS_GUEST:
791 sequence_number = read_int (greeter, &offset);
792 handle_login_as_guest (greeter, sequence_number);
794 case GREETER_MESSAGE_AUTHENTICATE_REMOTE:
795 sequence_number = read_int (greeter, &offset);
796 session_name = read_string (greeter, &offset);
797 username = read_string (greeter, &offset);
798 handle_login_remote (greeter, session_name, username, sequence_number);
800 case GREETER_MESSAGE_CONTINUE_AUTHENTICATION:
801 n_secrets = read_int (greeter, &offset);
802 max_secrets = (G_MAXUINT32 - 1) / sizeof (gchar *);
803 if (n_secrets > max_secrets)
805 l_warning (greeter, "Array length of %u elements too long", n_secrets);
806 greeter->priv->from_greeter_watch = 0;
809 secrets = g_malloc (sizeof (gchar *) * (n_secrets + 1));
810 for (i = 0; i < n_secrets; i++)
811 secrets[i] = read_secret (greeter, &offset);
813 handle_continue_authentication (greeter, secrets);
814 for (i = 0; i < n_secrets; i++)
815 secure_free (greeter, secrets[i]);
818 case GREETER_MESSAGE_CANCEL_AUTHENTICATION:
819 handle_cancel_authentication (greeter);
821 case GREETER_MESSAGE_START_SESSION:
822 session_name = read_string (greeter, &offset);
823 handle_start_session (greeter, session_name);
824 g_free (session_name);
826 case GREETER_MESSAGE_SET_LANGUAGE:
827 language = read_string (greeter, &offset);
828 handle_set_language (greeter, language);
831 case GREETER_MESSAGE_ENSURE_SHARED_DIR:
832 username = read_string (greeter, &offset);
833 handle_ensure_shared_dir (greeter, username);
837 l_warning (greeter, "Unknown message from greeter: %d", id);
841 greeter->priv->n_read = 0;
847 greeter_get_guest_authenticated (Greeter *greeter)
849 g_return_val_if_fail (greeter != NULL, FALSE);
850 return greeter->priv->guest_account_authenticated;
854 greeter_get_authentication_session (Greeter *greeter)
856 g_return_val_if_fail (greeter != NULL, NULL);
857 return greeter->priv->authentication_session;
861 greeter_get_start_session (Greeter *greeter)
863 g_return_val_if_fail (greeter != NULL, FALSE);
864 return greeter->priv->start_session;
868 greeter_get_active_username (Greeter *greeter)
870 g_return_val_if_fail (greeter != NULL, NULL);
871 return greeter->priv->active_username;
875 greeter_start (Session *session)
877 Greeter *greeter = GREETER (session);
878 int to_greeter_pipe[2], from_greeter_pipe[2];
879 gboolean result = FALSE;
882 /* Create a pipe to talk with the greeter */
883 if (pipe (to_greeter_pipe) != 0 || pipe (from_greeter_pipe) != 0)
885 g_warning ("Failed to create pipes: %s", strerror (errno));
888 greeter->priv->to_greeter_channel = g_io_channel_unix_new (to_greeter_pipe[1]);
889 g_io_channel_set_encoding (greeter->priv->to_greeter_channel, NULL, NULL);
890 greeter->priv->from_greeter_channel = g_io_channel_unix_new (from_greeter_pipe[0]);
891 g_io_channel_set_encoding (greeter->priv->from_greeter_channel, NULL, NULL);
892 g_io_channel_set_buffered (greeter->priv->from_greeter_channel, FALSE);
893 greeter->priv->from_greeter_watch = g_io_add_watch (greeter->priv->from_greeter_channel, G_IO_IN | G_IO_HUP, read_cb, greeter);
895 /* Let the greeter session know how to communicate with the daemon */
896 value = g_strdup_printf ("%d", from_greeter_pipe[1]);
897 session_set_env (SESSION (greeter), "LIGHTDM_TO_SERVER_FD", value);
899 value = g_strdup_printf ("%d", to_greeter_pipe[0]);
900 session_set_env (SESSION (greeter), "LIGHTDM_FROM_SERVER_FD", value);
903 /* Don't allow the daemon end of the pipes to be accessed in child processes */
904 fcntl (to_greeter_pipe[1], F_SETFD, FD_CLOEXEC);
905 fcntl (from_greeter_pipe[0], F_SETFD, FD_CLOEXEC);
907 result = SESSION_CLASS (greeter_parent_class)->start (session);
909 /* Close the session ends of the pipe */
910 close (to_greeter_pipe[0]);
911 close (from_greeter_pipe[1]);
917 greeter_real_create_session (Greeter *greeter)
923 greeter_real_start_session (Greeter *greeter, SessionType type, const gchar *session)
929 greeter_stop (Session *session)
931 Greeter *greeter = GREETER (session);
933 /* Stop any events occurring after we've stopped */
934 if (greeter->priv->authentication_session)
935 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
937 SESSION_CLASS (greeter_parent_class)->stop (session);
941 greeter_init (Greeter *greeter)
943 greeter->priv = G_TYPE_INSTANCE_GET_PRIVATE (greeter, GREETER_TYPE, GreeterPrivate);
944 greeter->priv->read_buffer = secure_malloc (greeter, HEADER_SIZE);
945 greeter->priv->hints = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
946 greeter->priv->use_secure_memory = config_get_boolean (config_get_instance (), "LightDM", "lock-memory");
950 greeter_finalize (GObject *object)
954 self = GREETER (object);
956 g_free (self->priv->pam_service);
957 g_free (self->priv->autologin_pam_service);
958 secure_free (self, self->priv->read_buffer);
959 g_hash_table_unref (self->priv->hints);
960 g_free (self->priv->remote_session);
961 g_free (self->priv->active_username);
962 if (self->priv->authentication_session)
964 g_signal_handlers_disconnect_matched (self->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
965 g_object_unref (self->priv->authentication_session);
967 if (self->priv->to_greeter_channel)
968 g_io_channel_unref (self->priv->to_greeter_channel);
969 if (self->priv->from_greeter_channel)
970 g_io_channel_unref (self->priv->from_greeter_channel);
971 if (self->priv->from_greeter_watch)
972 g_source_remove (self->priv->from_greeter_watch);
974 G_OBJECT_CLASS (greeter_parent_class)->finalize (object);
978 greeter_set_property (GObject *object,
983 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
987 greeter_get_property (GObject *object,
992 Greeter *greeter = GREETER (object);
995 case PROP_ACTIVE_USERNAME:
996 g_value_set_string (value, greeter_get_active_username (greeter));
999 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1005 greeter_class_init (GreeterClass *klass)
1007 SessionClass *session_class = SESSION_CLASS (klass);
1008 GObjectClass *object_class = G_OBJECT_CLASS (klass);
1010 klass->create_session = greeter_real_create_session;
1011 klass->start_session = greeter_real_start_session;
1012 session_class->start = greeter_start;
1013 session_class->stop = greeter_stop;
1014 object_class->finalize = greeter_finalize;
1015 object_class->get_property = greeter_get_property;
1016 object_class->set_property = greeter_set_property;
1018 signals[CONNECTED] =
1019 g_signal_new ("connected",
1020 G_TYPE_FROM_CLASS (klass),
1022 G_STRUCT_OFFSET (GreeterClass, connected),
1027 signals[CREATE_SESSION] =
1028 g_signal_new ("create-session",
1029 G_TYPE_FROM_CLASS (klass),
1031 G_STRUCT_OFFSET (GreeterClass, create_session),
1032 g_signal_accumulator_first_wins,
1037 signals[START_SESSION] =
1038 g_signal_new ("start-session",
1039 G_TYPE_FROM_CLASS (klass),
1041 G_STRUCT_OFFSET (GreeterClass, start_session),
1042 g_signal_accumulator_true_handled,
1045 G_TYPE_BOOLEAN, 2, G_TYPE_INT, G_TYPE_STRING);
1047 g_object_class_install_property (object_class,
1048 PROP_ACTIVE_USERNAME,
1049 g_param_spec_string ("active-username",
1055 g_type_class_add_private (klass, sizeof (GreeterPrivate));