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
20 #include <glib/gstdio.h>
25 #include "configuration.h"
26 #include "console-kit.h"
28 #include "guest-account.h"
32 AUTHENTICATION_COMPLETE,
36 static guint signals[LAST_SIGNAL] = { 0 };
43 /* Display server running on */
44 DisplayServer *display_server;
46 /* PID of child process */
49 /* Pipes to talk to child */
51 int from_child_output;
52 GIOChannel *from_child_channel;
53 guint from_child_watch;
56 /* User to authenticate as */
59 /* TRUE if is a guest account */
62 /* User object that matches the current username */
65 /* PAM service to use */
68 /* TRUE if should run PAM authentication phase */
69 gboolean do_authenticate;
71 /* TRUE if can handle PAM prompts */
72 gboolean is_interactive;
74 /* Messages being requested by PAM */
76 struct pam_message *messages;
78 /* Authentication result from PAM */
79 gboolean authentication_started;
80 gboolean authentication_complete;
81 int authentication_result;
82 gchar *authentication_result_string;
90 /* tty this session is running on */
93 /* X display connected to */
95 XAuthority *x_authority;
96 gboolean x_authority_use_system_location;
98 /* Remote host this session is being controlled from */
99 gchar *remote_host_name;
101 /* Console kit cookie */
102 gchar *console_kit_cookie;
105 gchar *login1_session;
107 /* Environment to set in child */
110 /* Command to run in child */
113 /* True if have run command */
114 gboolean command_run;
116 /* TRUE if stopping this session */
120 /* Maximum length of a string to pass between daemon and session */
121 #define MAX_STRING_LENGTH 65535
123 static void session_logger_iface_init (LoggerInterface *iface);
125 G_DEFINE_TYPE_WITH_CODE (Session, session, G_TYPE_OBJECT,
126 G_IMPLEMENT_INTERFACE (
127 LOGGER_TYPE, session_logger_iface_init));
132 return g_object_new (SESSION_TYPE, NULL);
136 session_set_session_type (Session *session, const gchar *session_type)
138 g_return_if_fail (session != NULL);
139 g_free (session->priv->session_type);
140 session->priv->session_type = g_strdup (session_type);
144 session_get_session_type (Session *session)
146 g_return_val_if_fail (session != NULL, NULL);
147 return session->priv->session_type;
151 session_set_pam_service (Session *session, const gchar *pam_service)
153 g_return_if_fail (session != NULL);
154 g_free (session->priv->pam_service);
155 session->priv->pam_service = g_strdup (pam_service);
159 session_set_username (Session *session, const gchar *username)
161 g_return_if_fail (session != NULL);
162 g_free (session->priv->username);
163 session->priv->username = g_strdup (username);
167 session_set_do_authenticate (Session *session, gboolean do_authenticate)
169 g_return_if_fail (session != NULL);
170 session->priv->do_authenticate = do_authenticate;
174 session_set_is_interactive (Session *session, gboolean is_interactive)
176 g_return_if_fail (session != NULL);
177 session->priv->is_interactive = is_interactive;
181 session_set_is_guest (Session *session, gboolean is_guest)
183 g_return_if_fail (session != NULL);
184 session->priv->is_guest = is_guest;
188 session_get_is_guest (Session *session)
190 g_return_val_if_fail (session != NULL, FALSE);
191 return session->priv->is_guest;
195 session_set_log_file (Session *session, const gchar *filename)
197 g_return_if_fail (session != NULL);
198 g_free (session->priv->log_filename);
199 session->priv->log_filename = g_strdup (filename);
203 session_set_class (Session *session, const gchar *class)
205 g_return_if_fail (session != NULL);
206 g_free (session->priv->class);
207 session->priv->class = g_strdup (class);
211 session_set_display_server (Session *session, DisplayServer *display_server)
213 g_return_if_fail (session != NULL);
214 g_return_if_fail (display_server != NULL);
215 if (session->priv->display_server)
217 display_server_disconnect_session (session->priv->display_server, session);
218 g_object_unref (session->priv->display_server);
220 session->priv->display_server = g_object_ref (display_server);
224 session_get_display_server (Session *session)
226 g_return_val_if_fail (session != NULL, NULL);
227 return session->priv->display_server;
231 session_set_tty (Session *session, const gchar *tty)
233 g_return_if_fail (session != NULL);
234 g_free (session->priv->tty);
235 session->priv->tty = g_strdup (tty);
239 session_set_xdisplay (Session *session, const gchar *xdisplay)
241 g_return_if_fail (session != NULL);
242 g_free (session->priv->xdisplay);
243 session->priv->xdisplay = g_strdup (xdisplay);
247 session_set_x_authority (Session *session, XAuthority *authority, gboolean use_system_location)
249 g_return_if_fail (session != NULL);
250 if (session->priv->x_authority)
252 g_object_unref (session->priv->x_authority);
253 session->priv->x_authority = NULL;
256 session->priv->x_authority = g_object_ref (authority);
257 session->priv->x_authority_use_system_location = use_system_location;
261 session_set_remote_host_name (Session *session, const gchar *remote_host_name)
263 g_return_if_fail (session != NULL);
264 g_free (session->priv->remote_host_name);
265 session->priv->remote_host_name = g_strdup (remote_host_name);
269 find_env_entry (Session *session, const gchar *name)
273 for (link = session->priv->env; link; link = link->next)
275 const gchar *entry = link->data;
277 if (g_str_has_prefix (entry, name) && entry[strlen (name)] == '=')
285 session_set_env (Session *session, const gchar *name, const gchar *value)
290 g_return_if_fail (session != NULL);
291 g_return_if_fail (value != NULL);
293 entry = g_strdup_printf ("%s=%s", name, value);
295 link = find_env_entry (session, name);
302 session->priv->env = g_list_append (session->priv->env, entry);
306 session_unset_env (Session *session, const gchar *name)
310 g_return_if_fail (session != NULL);
312 link = find_env_entry (session, name);
317 session->priv->env = g_list_remove_link (session->priv->env, link);
321 session_set_argv (Session *session, gchar **argv)
323 g_return_if_fail (session != NULL);
324 session->priv->argv = g_strdupv (argv);
328 session_get_user (Session *session)
330 g_return_val_if_fail (session != NULL, NULL);
332 if (session->priv->username == NULL)
335 if (!session->priv->user)
336 session->priv->user = accounts_get_user_by_name (session->priv->username);
338 return session->priv->user;
342 write_data (Session *session, const void *buf, size_t count)
344 if (write (session->priv->to_child_input, buf, count) != count)
345 l_warning (session, "Error writing to session: %s", strerror (errno));
349 write_string (Session *session, const char *value)
353 length = value ? strlen (value) : -1;
354 write_data (session, &length, sizeof (length));
356 write_data (session, value, sizeof (char) * length);
360 write_xauth (Session *session, XAuthority *x_authority)
367 write_string (session, NULL);
371 write_string (session, x_authority_get_authorization_name (session->priv->x_authority));
372 family = x_authority_get_family (session->priv->x_authority);
373 write_data (session, &family, sizeof (family));
374 length = x_authority_get_address_length (session->priv->x_authority);
375 write_data (session, &length, sizeof (length));
376 write_data (session, x_authority_get_address (session->priv->x_authority), length);
377 write_string (session, x_authority_get_number (session->priv->x_authority));
378 length = x_authority_get_authorization_data_length (session->priv->x_authority);
379 write_data (session, &length, sizeof (length));
380 write_data (session, x_authority_get_authorization_data (session->priv->x_authority), length);
384 read_from_child (Session *session, void *buf, size_t count)
387 n_read = read (session->priv->from_child_output, buf, count);
389 l_warning (session, "Error reading from session: %s", strerror (errno));
394 read_string_from_child (Session *session)
399 if (read_from_child (session, &length, sizeof (length)) <= 0)
403 if (length > MAX_STRING_LENGTH)
405 l_warning (session, "Invalid string length %d from child", length);
409 value = g_malloc (sizeof (char) * (length + 1));
410 read_from_child (session, value, length);
411 value[length] = '\0';
417 session_watch_cb (GPid pid, gint status, gpointer data)
419 Session *session = data;
421 session->priv->pid = 0;
423 if (WIFEXITED (status))
424 l_debug (session, "Exited with return value %d", WEXITSTATUS (status));
425 else if (WIFSIGNALED (status))
426 l_debug (session, "Terminated with signal %d", WTERMSIG (status));
428 /* If failed during authentication then report this as an authentication failure */
429 if (session->priv->authentication_started && !session->priv->authentication_complete)
431 l_debug (session, "Failed during authentication");
432 session->priv->authentication_complete = TRUE;
433 session->priv->authentication_result = PAM_CONV_ERR;
434 g_free (session->priv->authentication_result_string);
435 session->priv->authentication_result_string = g_strdup ("Authentication stopped before completion");
436 g_signal_emit (G_OBJECT (session), signals[AUTHENTICATION_COMPLETE], 0);
439 g_signal_emit (G_OBJECT (session), signals[STOPPED], 0);
441 /* Delete account if it is a guest one */
442 if (session->priv->is_guest)
443 guest_account_cleanup (session->priv->username);
445 /* Drop our reference on the child process, it has terminated */
446 g_object_unref (session);
450 from_child_cb (GIOChannel *source, GIOCondition condition, gpointer data)
452 Session *session = data;
455 gboolean auth_complete;
457 /* Remote end gone */
458 if (condition == G_IO_HUP)
460 session->priv->from_child_watch = 0;
464 /* Get the username currently being authenticated (may change during authentication) */
465 username = read_string_from_child (session);
466 if (g_strcmp0 (username, session->priv->username) != 0)
468 g_free (session->priv->username);
469 session->priv->username = username;
470 if (session->priv->user)
471 g_object_unref (session->priv->user);
472 session->priv->user = NULL;
477 /* Check if authentication completed */
478 n_read = read_from_child (session, &auth_complete, sizeof (auth_complete));
480 l_debug (session, "Error reading from child: %s", strerror (errno));
483 session->priv->from_child_watch = 0;
489 session->priv->authentication_complete = TRUE;
490 read_from_child (session, &session->priv->authentication_result, sizeof (session->priv->authentication_result));
491 g_free (session->priv->authentication_result_string);
492 session->priv->authentication_result_string = read_string_from_child (session);
494 l_debug (session, "Authentication complete with return value %d: %s", session->priv->authentication_result, session->priv->authentication_result_string);
496 /* No longer expect any more messages */
497 session->priv->from_child_watch = 0;
499 g_signal_emit (G_OBJECT (session), signals[AUTHENTICATION_COMPLETE], 0);
507 session->priv->messages_length = 0;
508 read_from_child (session, &session->priv->messages_length, sizeof (session->priv->messages_length));
509 session->priv->messages = calloc (session->priv->messages_length, sizeof (struct pam_message));
510 for (i = 0; i < session->priv->messages_length; i++)
512 struct pam_message *m = &session->priv->messages[i];
513 read_from_child (session, &m->msg_style, sizeof (m->msg_style));
514 m->msg = read_string_from_child (session);
517 l_debug (session, "Got %d message(s) from PAM", session->priv->messages_length);
519 g_signal_emit (G_OBJECT (session), signals[GOT_MESSAGES], 0);
526 session_start (Session *session)
528 g_return_val_if_fail (session != NULL, FALSE);
529 g_return_val_if_fail (session->priv->display_server != NULL, FALSE);
530 return SESSION_GET_CLASS (session)->start (session);
534 session_get_is_started (Session *session)
536 return session->priv->pid != 0;
540 session_real_start (Session *session)
543 int to_child_pipe[2], from_child_pipe[2];
544 int to_child_output, from_child_input;
546 g_return_val_if_fail (session->priv->pid == 0, FALSE);
548 display_server_connect_session (session->priv->display_server, session);
550 /* Create pipes to talk to the child */
551 if (pipe (to_child_pipe) < 0 || pipe (from_child_pipe) < 0)
553 g_warning ("Failed to create pipe to communicate with session process: %s", strerror (errno));
556 to_child_output = to_child_pipe[0];
557 session->priv->to_child_input = to_child_pipe[1];
558 session->priv->from_child_output = from_child_pipe[0];
559 from_child_input = from_child_pipe[1];
560 session->priv->from_child_channel = g_io_channel_unix_new (session->priv->from_child_output);
561 session->priv->from_child_watch = g_io_add_watch (session->priv->from_child_channel, G_IO_IN | G_IO_HUP, from_child_cb, session);
563 /* Don't allow the daemon end of the pipes to be accessed in child processes */
564 fcntl (session->priv->to_child_input, F_SETFD, FD_CLOEXEC);
565 fcntl (session->priv->from_child_output, F_SETFD, FD_CLOEXEC);
567 /* Create the guest account if it is one */
568 if (session->priv->is_guest && session->priv->username == NULL)
570 session->priv->username = guest_account_setup ();
571 if (!session->priv->username)
576 session->priv->pid = fork ();
577 if (session->priv->pid < 0)
579 g_debug ("Failed to fork session child process: %s", strerror (errno));
583 if (session->priv->pid == 0)
585 /* Run us again in session child mode */
589 g_strdup_printf ("%d", to_child_output),
590 g_strdup_printf ("%d", from_child_input),
592 _exit (EXIT_FAILURE);
595 /* Hold a reference on this object until the child process terminates so we
596 * can handle the watch callback even if it is no longer used. Otherwise a
597 * zombie process will remain */
598 g_object_ref (session);
600 /* Listen for session termination */
601 session->priv->authentication_started = TRUE;
602 session->priv->child_watch = g_child_watch_add (session->priv->pid, session_watch_cb, session);
604 /* Close the ends of the pipes we don't need */
605 close (to_child_output);
606 close (from_child_input);
608 /* Indicate what version of the protocol we are using */
610 write_data (session, &version, sizeof (version));
612 /* Send configuration */
613 write_string (session, session->priv->pam_service);
614 write_string (session, session->priv->username);
615 write_data (session, &session->priv->do_authenticate, sizeof (session->priv->do_authenticate));
616 write_data (session, &session->priv->is_interactive, sizeof (session->priv->is_interactive));
617 write_string (session, session->priv->class);
618 write_string (session, session->priv->tty);
619 write_string (session, session->priv->remote_host_name);
620 write_string (session, session->priv->xdisplay);
621 write_xauth (session, session->priv->x_authority);
623 l_debug (session, "Started with service '%s', username '%s'", session->priv->pam_service, session->priv->username);
629 session_get_username (Session *session)
631 g_return_val_if_fail (session != NULL, NULL);
632 return session->priv->username;
636 session_get_console_kit_cookie (Session *session)
638 g_return_val_if_fail (session != NULL, NULL);
639 return session->priv->console_kit_cookie;
643 session_respond (Session *session, struct pam_response *response)
645 int error = PAM_SUCCESS;
648 g_return_if_fail (session != NULL);
650 write_data (session, &error, sizeof (error));
651 for (i = 0; i < session->priv->messages_length; i++)
653 write_string (session, response[i].resp);
654 write_data (session, &response[i].resp_retcode, sizeof (response[i].resp_retcode));
657 /* Delete the old messages */
658 for (i = 0; i < session->priv->messages_length; i++)
659 g_free ((char *) session->priv->messages[i].msg);
660 g_free (session->priv->messages);
661 session->priv->messages = NULL;
662 session->priv->messages_length = 0;
666 session_respond_error (Session *session, int error)
668 g_return_if_fail (session != NULL);
669 g_return_if_fail (error != PAM_SUCCESS);
671 write_data (session, &error, sizeof (error));
675 session_get_messages_length (Session *session)
677 g_return_val_if_fail (session != NULL, 0);
678 return session->priv->messages_length;
681 const struct pam_message *
682 session_get_messages (Session *session)
684 g_return_val_if_fail (session != NULL, NULL);
685 return session->priv->messages;
689 session_get_is_authenticated (Session *session)
691 g_return_val_if_fail (session != NULL, FALSE);
692 return session->priv->authentication_complete && session->priv->authentication_result == PAM_SUCCESS;
696 session_get_authentication_result (Session *session)
698 g_return_val_if_fail (session != NULL, 0);
699 return session->priv->authentication_result;
703 session_get_authentication_result_string (Session *session)
705 g_return_val_if_fail (session != NULL, NULL);
706 return session->priv->authentication_result_string;
710 session_run (Session *session)
712 g_return_if_fail (session->priv->display_server != NULL);
713 return SESSION_GET_CLASS (session)->run (session);
717 session_real_run (Session *session)
720 gchar *command, *x_authority_filename;
723 g_return_if_fail (session != NULL);
724 g_return_if_fail (!session->priv->command_run);
725 g_return_if_fail (session_get_is_authenticated (session));
726 g_return_if_fail (session->priv->argv != NULL);
727 g_return_if_fail (session->priv->pid != 0);
729 display_server_connect_session (session->priv->display_server, session);
731 session->priv->command_run = TRUE;
733 command = g_strjoinv (" ", session->priv->argv);
734 l_debug (session, "Running command %s", command);
737 /* Create authority location */
738 if (session->priv->x_authority_use_system_location)
740 gchar *run_dir, *dir;
742 run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
743 dir = g_build_filename (run_dir, session->priv->username, NULL);
746 if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
747 l_warning (session, "Failed to set create system authority dir %s: %s", dir, strerror (errno));
750 if (chown (dir, user_get_uid (session_get_user (session)), user_get_gid (session_get_user (session))) < 0)
751 l_warning (session, "Failed to set ownership of user authority dir: %s", strerror (errno));
754 x_authority_filename = g_build_filename (dir, "xauthority", NULL);
758 x_authority_filename = g_build_filename (user_get_home_directory (session_get_user (session)), ".Xauthority", NULL);
760 write_string (session, session->priv->log_filename);
761 write_string (session, session->priv->tty);
762 write_string (session, x_authority_filename);
763 g_free (x_authority_filename);
764 write_string (session, session->priv->xdisplay);
765 write_xauth (session, session->priv->x_authority);
766 argc = g_list_length (session->priv->env);
767 write_data (session, &argc, sizeof (argc));
768 for (link = session->priv->env; link; link = link->next)
769 write_string (session, (gchar *) link->data);
770 argc = g_strv_length (session->priv->argv);
771 write_data (session, &argc, sizeof (argc));
772 for (i = 0; i < argc; i++)
773 write_string (session, session->priv->argv[i]);
775 if (login1_is_running ())
776 session->priv->login1_session = read_string_from_child (session);
777 if (!session->priv->login1_session)
778 session->priv->console_kit_cookie = read_string_from_child (session);
782 session_lock (Session *session)
784 g_return_if_fail (session != NULL);
787 if (session->priv->login1_session)
788 login1_lock_session (session->priv->login1_session);
789 else if (session->priv->console_kit_cookie)
790 ck_lock_session (session->priv->console_kit_cookie);
795 session_unlock (Session *session)
797 g_return_if_fail (session != NULL);
800 if (session->priv->login1_session)
801 login1_unlock_session (session->priv->login1_session);
802 else if (session->priv->console_kit_cookie)
803 ck_unlock_session (session->priv->console_kit_cookie);
808 session_stop (Session *session)
810 g_return_if_fail (session != NULL);
812 if (session->priv->stopping)
814 session->priv->stopping = TRUE;
816 return SESSION_GET_CLASS (session)->stop (session);
820 session_real_stop (Session *session)
822 g_return_if_fail (session != NULL);
824 if (session->priv->pid > 0)
826 l_debug (session, "Sending SIGTERM");
827 kill (session->priv->pid, SIGTERM);
828 // FIXME: Handle timeout
831 g_signal_emit (G_OBJECT (session), signals[STOPPED], 0);
835 session_get_is_stopping (Session *session)
837 g_return_val_if_fail (session != NULL, FALSE);
838 return session->priv->stopping;
842 session_init (Session *session)
844 session->priv = G_TYPE_INSTANCE_GET_PRIVATE (session, SESSION_TYPE, SessionPrivate);
845 session->priv->log_filename = g_strdup (".xsession-errors");
849 session_finalize (GObject *object)
851 Session *self = SESSION (object);
854 g_free (self->priv->session_type);
855 if (self->priv->display_server)
856 g_object_unref (self->priv->display_server);
858 kill (self->priv->pid, SIGKILL);
859 if (self->priv->from_child_channel)
860 g_io_channel_unref (self->priv->from_child_channel);
861 if (self->priv->from_child_watch)
862 g_source_remove (self->priv->from_child_watch);
863 if (self->priv->child_watch)
864 g_source_remove (self->priv->child_watch);
865 g_free (self->priv->username);
866 if (self->priv->user)
867 g_object_unref (self->priv->user);
868 g_free (self->priv->pam_service);
869 for (i = 0; i < self->priv->messages_length; i++)
870 g_free ((char *) self->priv->messages[i].msg);
871 g_free (self->priv->messages);
872 g_free (self->priv->authentication_result_string);
873 g_free (self->priv->log_filename);
874 g_free (self->priv->class);
875 g_free (self->priv->tty);
876 g_free (self->priv->xdisplay);
877 if (self->priv->x_authority)
878 g_object_unref (self->priv->x_authority);
879 g_free (self->priv->remote_host_name);
880 g_free (self->priv->login1_session);
881 g_free (self->priv->console_kit_cookie);
882 g_list_free_full (self->priv->env, g_free);
883 g_strfreev (self->priv->argv);
885 G_OBJECT_CLASS (session_parent_class)->finalize (object);
889 session_class_init (SessionClass *klass)
891 GObjectClass *object_class = G_OBJECT_CLASS (klass);
893 klass->start = session_real_start;
894 klass->run = session_real_run;
895 klass->stop = session_real_stop;
896 object_class->finalize = session_finalize;
898 g_type_class_add_private (klass, sizeof (SessionPrivate));
900 signals[GOT_MESSAGES] =
901 g_signal_new ("got-messages",
902 G_TYPE_FROM_CLASS (klass),
904 G_STRUCT_OFFSET (SessionClass, got_messages),
909 signals[AUTHENTICATION_COMPLETE] =
910 g_signal_new ("authentication-complete",
911 G_TYPE_FROM_CLASS (klass),
913 G_STRUCT_OFFSET (SessionClass, authentication_complete),
919 g_signal_new ("stopped",
920 G_TYPE_FROM_CLASS (klass),
922 G_STRUCT_OFFSET (SessionClass, stopped),
929 session_real_logprefix (Logger *self, gchar *buf, gulong buflen)
931 Session *session = SESSION (self);
932 if (session->priv->pid != 0)
933 return g_snprintf (buf, buflen, "Session pid=%d: ", session->priv->pid);
935 return g_snprintf (buf, buflen, "Session: ");
939 session_logger_iface_init (LoggerInterface *iface)
941 iface->logprefix = &session_real_logprefix;