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|
/*
* Copyright (C) 2010-2011 Robert Ancell.
* Author: Robert Ancell <robert.ancell@canonical.com>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version. See http://www.gnu.org/copyleft/gpl.html the full text of the
* license.
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <glib/gstdio.h>
#include <grp.h>
#include <pwd.h>
#include "session.h"
#include "configuration.h"
#include "console-kit.h"
#include "login1.h"
#include "guest-account.h"
#include "shared-data-manager.h"
#include "greeter-socket.h"
enum {
CREATE_GREETER,
GOT_MESSAGES,
AUTHENTICATION_COMPLETE,
STOPPED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
typedef struct
{
/* Configuration for this session */
SessionConfig *config;
/* Display server running on */
DisplayServer *display_server;
/* PID of child process */
GPid pid;
/* Pipes to talk to child */
int to_child_input;
int from_child_output;
GIOChannel *from_child_channel;
guint from_child_watch;
guint child_watch;
/* User to authenticate as */
gchar *username;
/* TRUE if is a guest account */
gboolean is_guest;
/* User object that matches the current username */
User *user;
/* PAM service to use */
gchar *pam_service;
/* TRUE if should run PAM authentication phase */
gboolean do_authenticate;
/* TRUE if can handle PAM prompts */
gboolean is_interactive;
/* Messages being requested by PAM */
size_t messages_length;
struct pam_message *messages;
/* Authentication result from PAM */
gboolean authentication_started;
gboolean authentication_complete;
int authentication_result;
gchar *authentication_result_string;
/* File to log to */
gchar *log_filename;
LogMode log_mode;
/* tty this session is running on */
gchar *tty;
/* X display connected to */
gchar *xdisplay;
XAuthority *x_authority;
gboolean x_authority_use_system_location;
/* Socket to allow greeters to connect to (if allowed) */
GreeterSocket *greeter_socket;
/* Remote host this session is being controlled from */
gchar *remote_host_name;
/* Console kit cookie */
gchar *console_kit_cookie;
/* login1 session ID */
gchar *login1_session_id;
/* Environment to set in child */
GList *env;
/* Command to run in child */
gchar **argv;
/* True if have run command */
gboolean command_run;
/* TRUE if stopping this session */
gboolean stopping;
} SessionPrivate;
/* Maximum length of a string to pass between daemon and session */
#define MAX_STRING_LENGTH 65535
static void session_logger_iface_init (LoggerInterface *iface);
G_DEFINE_TYPE_WITH_CODE (Session, session, G_TYPE_OBJECT,
G_ADD_PRIVATE (Session)
G_IMPLEMENT_INTERFACE (
LOGGER_TYPE, session_logger_iface_init))
Session *
session_new (void)
{
return g_object_new (SESSION_TYPE, NULL);
}
void
session_set_config (Session *session, SessionConfig *config)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_clear_object (&priv->config);
priv->config = g_object_ref (config);
}
SessionConfig *
session_get_config (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return priv->config;
}
const gchar *
session_get_session_type (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return session_config_get_session_type (priv->config);
}
void
session_set_pam_service (Session *session, const gchar *pam_service)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_free (priv->pam_service);
priv->pam_service = g_strdup (pam_service);
}
void
session_set_username (Session *session, const gchar *username)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_free (priv->username);
priv->username = g_strdup (username);
}
void
session_set_do_authenticate (Session *session, gboolean do_authenticate)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
priv->do_authenticate = do_authenticate;
}
void
session_set_is_interactive (Session *session, gboolean is_interactive)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
priv->is_interactive = is_interactive;
}
void
session_set_is_guest (Session *session, gboolean is_guest)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
priv->is_guest = is_guest;
}
gboolean
session_get_is_guest (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, FALSE);
return priv->is_guest;
}
void
session_set_log_file (Session *session, const gchar *filename, LogMode log_mode)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_free (priv->log_filename);
priv->log_filename = g_strdup (filename);
priv->log_mode = log_mode;
}
void
session_set_display_server (Session *session, DisplayServer *display_server)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_return_if_fail (display_server != NULL);
if (priv->display_server == display_server)
return;
if (priv->display_server)
display_server_disconnect_session (priv->display_server, session);
g_clear_object (&priv->display_server);
priv->display_server = g_object_ref (display_server);
}
DisplayServer *
session_get_display_server (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return priv->display_server;
}
void
session_set_tty (Session *session, const gchar *tty)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_free (priv->tty);
priv->tty = g_strdup (tty);
}
void
session_set_xdisplay (Session *session, const gchar *xdisplay)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_free (priv->xdisplay);
priv->xdisplay = g_strdup (xdisplay);
}
void
session_set_x_authority (Session *session, XAuthority *authority, gboolean use_system_location)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_clear_object (&priv->x_authority);
if (authority)
priv->x_authority = g_object_ref (authority);
priv->x_authority_use_system_location = use_system_location;
}
void
session_set_remote_host_name (Session *session, const gchar *remote_host_name)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_free (priv->remote_host_name);
priv->remote_host_name = g_strdup (remote_host_name);
}
static GList *
find_env_entry (Session *session, const gchar *name)
{
SessionPrivate *priv = session_get_instance_private (session);
for (GList *link = priv->env; link; link = link->next)
{
const gchar *entry = link->data;
if (g_str_has_prefix (entry, name) && entry[strlen (name)] == '=')
return link;
}
return NULL;
}
void
session_set_env (Session *session, const gchar *name, const gchar *value)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_return_if_fail (value != NULL);
gchar *entry = g_strdup_printf ("%s=%s", name, value);
GList *link = find_env_entry (session, name);
if (link)
{
g_free (link->data);
link->data = entry;
}
else
priv->env = g_list_append (priv->env, entry);
}
const gchar *
session_get_env (Session *session, const gchar *name)
{
GList *link = find_env_entry (session, name);
if (!link)
return NULL;
gchar *entry = link->data;
return entry + strlen (name) + 1;
}
void
session_unset_env (Session *session, const gchar *name)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
GList *link = find_env_entry (session, name);
if (!link)
return;
g_free (link->data);
priv->env = g_list_delete_link (priv->env, link);
}
void
session_set_argv (Session *session, gchar **argv)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
priv->argv = g_strdupv (argv);
}
User *
session_get_user (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
if (priv->username == NULL)
return NULL;
if (!priv->user)
priv->user = accounts_get_user_by_name (priv->username);
return priv->user;
}
static void
write_data (Session *session, const void *buf, size_t count)
{
SessionPrivate *priv = session_get_instance_private (session);
if (write (priv->to_child_input, buf, count) != count)
l_warning (session, "Error writing to session: %s", strerror (errno));
}
static void
write_string (Session *session, const char *value)
{
int length = value ? strlen (value) : -1;
write_data (session, &length, sizeof (length));
if (value)
write_data (session, value, sizeof (char) * length);
}
static void
write_xauth (Session *session, XAuthority *x_authority)
{
SessionPrivate *priv = session_get_instance_private (session);
if (!x_authority)
{
write_string (session, NULL);
return;
}
write_string (session, x_authority_get_authorization_name (priv->x_authority));
guint16 family = x_authority_get_family (priv->x_authority);
write_data (session, &family, sizeof (family));
gsize length = x_authority_get_address_length (priv->x_authority);
write_data (session, &length, sizeof (length));
write_data (session, x_authority_get_address (priv->x_authority), length);
write_string (session, x_authority_get_number (priv->x_authority));
length = x_authority_get_authorization_data_length (priv->x_authority);
write_data (session, &length, sizeof (length));
write_data (session, x_authority_get_authorization_data (priv->x_authority), length);
}
static ssize_t
read_from_child (Session *session, void *buf, size_t count)
{
SessionPrivate *priv = session_get_instance_private (session);
ssize_t n_read = read (priv->from_child_output, buf, count);
if (n_read < 0)
l_warning (session, "Error reading from session: %s", strerror (errno));
return n_read;
}
static gchar *
read_string_from_child (Session *session)
{
int length;
if (read_from_child (session, &length, sizeof (length)) <= 0)
return NULL;
if (length < 0)
return NULL;
if (length > MAX_STRING_LENGTH)
{
l_warning (session, "Invalid string length %d from child", length);
return NULL;
}
char *value = g_malloc (sizeof (char) * (length + 1));
read_from_child (session, value, length);
value[length] = '\0';
return value;
}
static void
session_watch_cb (GPid pid, gint status, gpointer data)
{
Session *session = data;
SessionPrivate *priv = session_get_instance_private (session);
priv->child_watch = 0;
if (WIFEXITED (status))
l_debug (session, "Exited with return value %d", WEXITSTATUS (status));
else if (WIFSIGNALED (status))
l_debug (session, "Terminated with signal %d", WTERMSIG (status));
/* do this as late as possible for log messages prefix */
priv->pid = 0;
/* If failed during authentication then report this as an authentication failure */
if (priv->authentication_started && !priv->authentication_complete)
{
l_debug (session, "Failed during authentication");
priv->authentication_complete = TRUE;
priv->authentication_result = PAM_CONV_ERR;
g_free (priv->authentication_result_string);
priv->authentication_result_string = g_strdup ("Authentication stopped before completion");
g_signal_emit (G_OBJECT (session), signals[AUTHENTICATION_COMPLETE], 0);
}
g_signal_emit (G_OBJECT (session), signals[STOPPED], 0);
/* Delete account if it is a guest one */
if (priv->is_guest)
guest_account_cleanup (priv->username);
/* Drop our reference on the child process, it has terminated */
g_object_unref (session);
}
static gboolean
from_child_cb (GIOChannel *source, GIOCondition condition, gpointer data)
{
Session *session = data;
SessionPrivate *priv = session_get_instance_private (session);
/* Remote end gone */
if (condition == G_IO_HUP)
{
priv->from_child_watch = 0;
return FALSE;
}
/* Get the username currently being authenticated (may change during authentication) */
g_autofree gchar *username = read_string_from_child (session);
if (g_strcmp0 (username, priv->username) != 0)
{
g_free (priv->username);
priv->username = g_steal_pointer (&username);
g_clear_object (&priv->user);
}
/* Check if authentication completed */
gboolean auth_complete;
ssize_t n_read = read_from_child (session, &auth_complete, sizeof (auth_complete));
if (n_read < 0)
l_debug (session, "Error reading from child: %s", strerror (errno));
if (n_read <= 0)
{
priv->from_child_watch = 0;
return FALSE;
}
if (auth_complete)
{
priv->authentication_complete = TRUE;
read_from_child (session, &priv->authentication_result, sizeof (priv->authentication_result));
g_free (priv->authentication_result_string);
priv->authentication_result_string = read_string_from_child (session);
l_debug (session, "Authentication complete with return value %d: %s", priv->authentication_result, priv->authentication_result_string);
/* No longer expect any more messages */
priv->from_child_watch = 0;
g_signal_emit (G_OBJECT (session), signals[AUTHENTICATION_COMPLETE], 0);
return FALSE;
}
else
{
priv->messages_length = 0;
read_from_child (session, &priv->messages_length, sizeof (priv->messages_length));
priv->messages = calloc (priv->messages_length, sizeof (struct pam_message));
for (int i = 0; i < priv->messages_length; i++)
{
struct pam_message *m = &priv->messages[i];
read_from_child (session, &m->msg_style, sizeof (m->msg_style));
m->msg = read_string_from_child (session);
}
l_debug (session, "Got %zi message(s) from PAM", priv->messages_length);
g_signal_emit (G_OBJECT (session), signals[GOT_MESSAGES], 0);
}
return TRUE;
}
gboolean
session_start (Session *session)
{
g_return_val_if_fail (session != NULL, FALSE);
return SESSION_GET_CLASS (session)->start (session);
}
gboolean
session_get_is_started (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
return priv->pid != 0;
}
static Greeter *
create_greeter_cb (GreeterSocket *socket, Session *session)
{
Greeter *greeter = NULL;
g_signal_emit (session, signals[CREATE_GREETER], 0, &greeter);
return greeter;
}
static gboolean
session_real_start (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (priv->pid == 0, FALSE);
if (priv->display_server)
display_server_connect_session (priv->display_server, session);
/* Create pipes to talk to the child */
int to_child_pipe[2], from_child_pipe[2];
if (pipe (to_child_pipe) < 0 || pipe (from_child_pipe) < 0)
{
g_warning ("Failed to create pipe to communicate with session process: %s", strerror (errno));
return FALSE;
}
int to_child_output = to_child_pipe[0];
priv->to_child_input = to_child_pipe[1];
priv->from_child_output = from_child_pipe[0];
int from_child_input = from_child_pipe[1];
priv->from_child_channel = g_io_channel_unix_new (priv->from_child_output);
priv->from_child_watch = g_io_add_watch (priv->from_child_channel, G_IO_IN | G_IO_HUP, from_child_cb, session);
/* Don't allow the daemon end of the pipes to be accessed in child processes */
fcntl (priv->to_child_input, F_SETFD, FD_CLOEXEC);
fcntl (priv->from_child_output, F_SETFD, FD_CLOEXEC);
/* Create the guest account if it is one */
if (priv->is_guest && priv->username == NULL)
{
priv->username = guest_account_setup ();
if (!priv->username)
return FALSE;
}
/* Run the child */
g_autofree gchar *arg0 = g_strdup_printf ("%d", to_child_output);
g_autofree gchar *arg1 = g_strdup_printf ("%d", from_child_input);
priv->pid = fork ();
if (priv->pid == 0)
{
/* Run us again in session child mode */
execlp ("lightdm",
"lightdm",
"--session-child",
arg0, arg1, NULL);
_exit (EXIT_FAILURE);
}
if (priv->pid < 0)
{
g_debug ("Failed to fork session child process: %s", strerror (errno));
return FALSE;
}
/* Hold a reference on this object until the child process terminates so we
* can handle the watch callback even if it is no longer used. Otherwise a
* zombie process will remain */
g_object_ref (session);
/* Listen for session termination */
priv->authentication_started = TRUE;
priv->child_watch = g_child_watch_add (priv->pid, session_watch_cb, session);
/* Close the ends of the pipes we don't need */
close (to_child_output);
close (from_child_input);
/* Indicate what version of the protocol we are using */
int version = 3;
write_data (session, &version, sizeof (version));
/* Send configuration */
write_string (session, priv->pam_service);
write_string (session, priv->username);
write_data (session, &priv->do_authenticate, sizeof (priv->do_authenticate));
write_data (session, &priv->is_interactive, sizeof (priv->is_interactive));
write_string (session, NULL); /* Used to be class, now we just use the environment variable */
write_string (session, priv->tty);
write_string (session, priv->remote_host_name);
write_string (session, priv->xdisplay);
write_xauth (session, priv->x_authority);
l_debug (session, "Started with service '%s', username '%s'", priv->pam_service, priv->username);
return TRUE;
}
const gchar *
session_get_username (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return priv->username;
}
const gchar *
session_get_login1_session_id (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return priv->login1_session_id;
}
const gchar *
session_get_console_kit_cookie (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return priv->console_kit_cookie;
}
void
session_respond (Session *session, struct pam_response *response)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
int error = PAM_SUCCESS;
write_data (session, &error, sizeof (error));
for (size_t i = 0; i < priv->messages_length; i++)
{
write_string (session, response[i].resp);
write_data (session, &response[i].resp_retcode, sizeof (response[i].resp_retcode));
}
/* Delete the old messages */
for (size_t i = 0; i < priv->messages_length; i++)
g_free ((char *) priv->messages[i].msg);
g_free (priv->messages);
priv->messages = NULL;
priv->messages_length = 0;
}
void
session_respond_error (Session *session, int error)
{
g_return_if_fail (session != NULL);
g_return_if_fail (error != PAM_SUCCESS);
write_data (session, &error, sizeof (error));
}
size_t
session_get_messages_length (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, 0);
return priv->messages_length;
}
const struct pam_message *
session_get_messages (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return priv->messages;
}
gboolean
session_get_is_authenticated (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, FALSE);
return priv->authentication_complete && priv->authentication_result == PAM_SUCCESS;
}
int
session_get_authentication_result (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, 0);
return priv->authentication_result;
}
const gchar *
session_get_authentication_result_string (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, NULL);
return priv->authentication_result_string;
}
void
session_run (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_return_if_fail (priv->display_server != NULL);
return SESSION_GET_CLASS (session)->run (session);
}
gboolean
session_get_is_run (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, FALSE);
return priv->command_run;
}
static void
session_real_run (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
g_return_if_fail (!priv->command_run);
g_return_if_fail (session_get_is_authenticated (session));
g_return_if_fail (priv->argv != NULL);
g_return_if_fail (priv->pid != 0);
display_server_connect_session (priv->display_server, session);
priv->command_run = TRUE;
g_autofree gchar *command = g_strjoinv (" ", priv->argv);
l_debug (session, "Running command %s", command);
/* Create authority location */
g_autofree gchar *x_authority_filename = NULL;
if (priv->x_authority_use_system_location)
{
g_autofree gchar *run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
g_autofree gchar *dir = g_build_filename (run_dir, priv->username, NULL);
if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
l_warning (session, "Failed to set create system authority dir %s: %s", dir, strerror (errno));
if (getuid () == 0)
{
if (chown (dir, user_get_uid (session_get_user (session)), user_get_gid (session_get_user (session))) < 0)
l_warning (session, "Failed to set ownership of user authority dir: %s", strerror (errno));
}
x_authority_filename = g_build_filename (dir, "xauthority", NULL);
}
else
x_authority_filename = g_build_filename (user_get_home_directory (session_get_user (session)), ".Xauthority", NULL);
/* Make sure shared user directory for this user exists */
if (!priv->remote_host_name)
{
g_autofree gchar *data_dir = shared_data_manager_ensure_user_dir (shared_data_manager_get_instance (), priv->username);
if (data_dir)
session_set_env (session, "XDG_GREETER_DATA_DIR", data_dir);
}
/* Open socket to allow in-session greeter */
if (priv->config && session_config_get_allow_greeter (priv->config))
{
g_autofree gchar *run_dir = config_get_string (config_get_instance (), "LightDM", "run-directory");
g_autofree gchar *dir = g_build_filename (run_dir, priv->username, NULL);
if (g_mkdir_with_parents (dir, S_IRWXU) < 0)
l_warning (session, "Failed to create greeter socket dir %s: %s", dir, strerror (errno));
if (getuid () == 0)
{
if (chown (dir, user_get_uid (session_get_user (session)), user_get_gid (session_get_user (session))) < 0)
l_warning (session, "Failed to set ownership of greeter socket dir: %s", strerror (errno));
}
g_autofree gchar *path = g_build_filename (dir, "greeter-socket", NULL);
priv->greeter_socket = greeter_socket_new (path);
g_signal_connect (priv->greeter_socket, GREETER_SOCKET_SIGNAL_CREATE_GREETER, G_CALLBACK (create_greeter_cb), session);
session_set_env (session, "LIGHTDM_GREETER_PIPE", path);
g_autoptr(GError) error = NULL;
if (!greeter_socket_start (priv->greeter_socket, &error))
l_warning (session, "Failed to start greeter socket: %s\n", error->message);
}
if (priv->log_filename)
l_debug (session, "Logging to %s", priv->log_filename);
write_string (session, priv->log_filename);
write_data (session, &priv->log_mode, sizeof (priv->log_mode));
write_string (session, priv->tty);
write_string (session, x_authority_filename);
write_string (session, priv->xdisplay);
write_xauth (session, priv->x_authority);
gsize argc = g_list_length (priv->env);
write_data (session, &argc, sizeof (argc));
for (GList *link = priv->env; link; link = link->next)
write_string (session, (gchar *) link->data);
argc = g_strv_length (priv->argv);
write_data (session, &argc, sizeof (argc));
for (gsize i = 0; i < argc; i++)
write_string (session, priv->argv[i]);
priv->login1_session_id = read_string_from_child (session);
priv->console_kit_cookie = read_string_from_child (session);
}
void
session_lock (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
if (getuid () == 0)
{
if (priv->login1_session_id)
login1_service_lock_session (login1_service_get_instance (), priv->login1_session_id);
else if (priv->console_kit_cookie)
ck_lock_session (priv->console_kit_cookie);
}
}
void
session_unlock (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
if (getuid () == 0)
{
if (priv->login1_session_id)
login1_service_unlock_session (login1_service_get_instance (), priv->login1_session_id);
else if (priv->console_kit_cookie)
ck_unlock_session (priv->console_kit_cookie);
}
}
void
session_activate (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
if (getuid () == 0)
{
if (priv->login1_session_id)
login1_service_activate_session (login1_service_get_instance (), priv->login1_session_id);
else if (priv->console_kit_cookie)
ck_activate_session (priv->console_kit_cookie);
}
}
void
session_stop (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
if (priv->stopping)
return;
priv->stopping = TRUE;
/* Kill remaining processes in our logind session to avoid them leaking
* to the user session (they share the same $DISPLAY) */
if (getuid () == 0 && priv->login1_session_id)
login1_service_terminate_session (login1_service_get_instance (), priv->login1_session_id);
/* If can cleanly stop then do that */
if (session_get_is_authenticated (session) && !priv->command_run)
{
priv->command_run = TRUE;
write_string (session, NULL); // log filename
LogMode log_mode = LOG_MODE_INVALID;
write_data (session, &log_mode, sizeof (log_mode)); // log mode
write_string (session, NULL); // tty
write_string (session, NULL); // xauth filename
write_string (session, NULL); // xdisplay
write_xauth (session, NULL); // xauth
gsize n = 0;
write_data (session, &n, sizeof (n)); // environment
write_data (session, &n, sizeof (n)); // command
return;
}
return SESSION_GET_CLASS (session)->stop (session);
}
static void
session_real_stop (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_if_fail (session != NULL);
if (priv->pid > 0)
{
l_debug (session, "Sending SIGTERM");
kill (priv->pid, SIGTERM);
// FIXME: Handle timeout
}
else
g_signal_emit (G_OBJECT (session), signals[STOPPED], 0);
}
gboolean
session_get_is_stopping (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
g_return_val_if_fail (session != NULL, FALSE);
return priv->stopping;
}
static void
session_init (Session *session)
{
SessionPrivate *priv = session_get_instance_private (session);
priv->log_filename = g_strdup (".xsession-errors");
priv->log_mode = LOG_MODE_BACKUP_AND_TRUNCATE;
priv->to_child_input = -1;
priv->from_child_output = -1;
}
static void
session_finalize (GObject *object)
{
Session *self = SESSION (object);
SessionPrivate *priv = session_get_instance_private (self);
g_clear_object (&priv->config);
g_clear_object (&priv->display_server);
if (priv->pid)
kill (priv->pid, SIGKILL);
close (priv->to_child_input);
close (priv->from_child_output);
g_clear_pointer (&priv->from_child_channel, g_io_channel_unref);
if (priv->from_child_watch)
g_source_remove (priv->from_child_watch);
if (priv->child_watch)
g_source_remove (priv->child_watch);
g_clear_pointer (&priv->username, g_free);
g_clear_object (&priv->user);
g_clear_pointer (&priv->pam_service, g_free);
for (size_t i = 0; i < priv->messages_length; i++)
g_free ((char *) priv->messages[i].msg);
g_clear_pointer (&priv->messages, g_free);
g_clear_pointer (&priv->authentication_result_string, g_free);
g_clear_pointer (&priv->log_filename, g_free);
g_clear_pointer (&priv->tty, g_free);
g_clear_pointer (&priv->xdisplay, g_free);
g_clear_object (&priv->x_authority);
g_clear_pointer (&priv->remote_host_name, g_free);
g_clear_pointer (&priv->login1_session_id, g_free);
g_clear_pointer (&priv->console_kit_cookie, g_free);
g_list_free_full (priv->env, g_free);
g_clear_pointer (&priv->argv, g_strfreev);
G_OBJECT_CLASS (session_parent_class)->finalize (object);
}
static void
session_class_init (SessionClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
klass->start = session_real_start;
klass->run = session_real_run;
klass->stop = session_real_stop;
object_class->finalize = session_finalize;
signals[CREATE_GREETER] =
g_signal_new (SESSION_SIGNAL_CREATE_GREETER,
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (SessionClass, create_greeter),
g_signal_accumulator_first_wins,
NULL,
NULL,
GREETER_TYPE, 0);
signals[GOT_MESSAGES] =
g_signal_new (SESSION_SIGNAL_GOT_MESSAGES,
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (SessionClass, got_messages),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
signals[AUTHENTICATION_COMPLETE] =
g_signal_new (SESSION_SIGNAL_AUTHENTICATION_COMPLETE,
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (SessionClass, authentication_complete),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
signals[STOPPED] =
g_signal_new (SESSION_SIGNAL_STOPPED,
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (SessionClass, stopped),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
}
static gint
session_real_logprefix (Logger *self, gchar *buf, gulong buflen)
{
Session *session = SESSION (self);
SessionPrivate *priv = session_get_instance_private (session);
if (priv->pid != 0)
return g_snprintf (buf, buflen, "Session pid=%d: ", priv->pid);
else
return g_snprintf (buf, buflen, "Session: ");
}
static void
session_logger_iface_init (LoggerInterface *iface)
{
iface->logprefix = &session_real_logprefix;
}
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