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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 "ldm-marshal.h"
#include "pam-session.h"
enum {
AUTHENTICATION_STARTED,
STARTED,
GOT_MESSAGES,
AUTHENTICATION_RESULT,
ENDED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
struct PAMSessionPrivate
{
/* Service to authenticate against */
gchar *service;
/* User being authenticated */
gchar *username;
/* Authentication thread */
GThread *authentication_thread;
/* TRUE if the thread is being intentionally stopped */
gboolean stop;
/* TRUE if the conversation should be cancelled */
gboolean cancel;
/* Messages requested */
int num_messages;
const struct pam_message **messages;
int result;
/* Queue to feed responses to the authentication thread */
GAsyncQueue *authentication_response_queue;
/* Authentication handle */
pam_handle_t *pam_handle;
/* TRUE if in a session */
gboolean in_session;
};
G_DEFINE_TYPE (PAMSession, pam_session, G_TYPE_OBJECT);
PAMSession *
pam_session_new (const gchar *service, const gchar *username)
{
PAMSession *self = g_object_new (PAM_SESSION_TYPE, NULL);
self->priv->service = g_strdup (service);
self->priv->username = g_strdup (username);
return self;
}
gboolean
pam_session_get_in_session (PAMSession *session)
{
return session->priv->in_session;
}
void
pam_session_authorize (PAMSession *session)
{
session->priv->in_session = TRUE;
// FIXME:
//pam_set_item (session->priv->pam_handle, PAM_TTY, &tty);
//pam_set_item (session->priv->pam_handle, PAM_XDISPLAY, &display);
pam_open_session (session->priv->pam_handle, 0);
g_signal_emit (G_OBJECT (session), signals[STARTED], 0);
}
static gboolean
notify_messages_cb (gpointer data)
{
PAMSession *session = data;
g_signal_emit (G_OBJECT (session), signals[GOT_MESSAGES], 0, session->priv->num_messages, session->priv->messages);
return FALSE;
}
static int
pam_conv_cb (int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *app_data)
{
PAMSession *session = app_data;
struct pam_response *response;
/* Notify user */
session->priv->num_messages = num_msg;
session->priv->messages = msg;
g_idle_add (notify_messages_cb, session);
/* Wait for response */
response = g_async_queue_pop (session->priv->authentication_response_queue);
session->priv->num_messages = 0;
session->priv->messages = NULL;
/* Cancelled by user */
if (session->priv->stop || session->priv->cancel)
{
session->priv->cancel = FALSE;
return PAM_CONV_ERR;
}
*resp = response;
return PAM_SUCCESS;
}
static gboolean
notify_auth_complete_cb (gpointer data)
{
PAMSession *session = data;
int result;
result = session->priv->result;
session->priv->result = 0;
g_thread_join (session->priv->authentication_thread);
session->priv->authentication_thread = NULL;
g_async_queue_unref (session->priv->authentication_response_queue);
session->priv->authentication_response_queue = NULL;
/* Authentication was cancelled */
if (session->priv->stop)
pam_session_end (session);
else
g_signal_emit (G_OBJECT (session), signals[AUTHENTICATION_RESULT], 0, result);
/* The thread is complete, drop the reference */
g_object_unref (session);
return FALSE;
}
static gpointer
authenticate_cb (gpointer data)
{
PAMSession *session = data;
struct pam_conv conversation = { pam_conv_cb, session };
pam_start (session->priv->service, session->priv->username, &conversation, &session->priv->pam_handle);
session->priv->result = pam_authenticate (session->priv->pam_handle, 0);
g_debug ("pam_authenticate -> %s", pam_strerror (session->priv->pam_handle, session->priv->result));
/* Notify user */
g_idle_add (notify_auth_complete_cb, session);
return NULL;
}
gboolean
pam_session_start (PAMSession *session, GError **error)
{
g_return_val_if_fail (session->priv->authentication_thread == NULL, FALSE);
g_signal_emit (G_OBJECT (session), signals[AUTHENTICATION_STARTED], 0);
/* Hold a reference to this object while the thread may access it */
g_object_ref (session);
/* Start thread */
session->priv->authentication_response_queue = g_async_queue_new ();
session->priv->authentication_thread = g_thread_create (authenticate_cb, session, TRUE, error);
if (!session->priv->authentication_thread)
return FALSE;
return TRUE;
}
const gchar *
pam_session_strerror (PAMSession *session, int error)
{
return pam_strerror (session->priv->pam_handle, error);
}
const gchar *
pam_session_get_username (PAMSession *session)
{
return session->priv->username;
}
const struct pam_message **
pam_session_get_messages (PAMSession *session)
{
return session->priv->messages;
}
gint
pam_session_get_num_messages (PAMSession *session)
{
return session->priv->num_messages;
}
void
pam_session_respond (PAMSession *session, struct pam_response *response)
{
g_return_if_fail (session->priv->authentication_thread != NULL);
g_async_queue_push (session->priv->authentication_response_queue, response);
}
void
pam_session_cancel (PAMSession *session)
{
g_return_if_fail (session->priv->authentication_thread != NULL);
session->priv->cancel = TRUE;
g_async_queue_push (session->priv->authentication_response_queue, GINT_TO_POINTER (-1));
}
const gchar *
pam_session_getenv (PAMSession *session, const gchar *name)
{
return pam_getenv (session->priv->pam_handle, name);
}
gchar **
pam_session_get_envlist (PAMSession *session)
{
return pam_getenvlist (session->priv->pam_handle);
}
void
pam_session_end (PAMSession *session)
{
/* If authenticating cancel first */
if (session->priv->authentication_thread)
{
session->priv->stop = TRUE;
g_async_queue_push (session->priv->authentication_response_queue, GINT_TO_POINTER (-1));
}
else if (session->priv->in_session)
{
pam_close_session (session->priv->pam_handle, 0);
session->priv->in_session = FALSE;
g_signal_emit (G_OBJECT (session), signals[ENDED], 0);
}
}
static void
pam_session_init (PAMSession *session)
{
session->priv = G_TYPE_INSTANCE_GET_PRIVATE (session, PAM_SESSION_TYPE, PAMSessionPrivate);
}
static void
pam_session_finalize (GObject *object)
{
PAMSession *self;
self = PAM_SESSION (object);
pam_session_end (self);
g_free (self->priv->username);
if (self->priv->pam_handle)
pam_end (self->priv->pam_handle, PAM_SUCCESS);
G_OBJECT_CLASS (pam_session_parent_class)->finalize (object);
}
static void
pam_session_class_init (PAMSessionClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = pam_session_finalize;
g_type_class_add_private (klass, sizeof (PAMSessionPrivate));
signals[AUTHENTICATION_STARTED] =
g_signal_new ("authentication-started",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PAMSessionClass, authentication_started),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
signals[STARTED] =
g_signal_new ("started",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PAMSessionClass, started),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
signals[GOT_MESSAGES] =
g_signal_new ("got-messages",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PAMSessionClass, got_messages),
NULL, NULL,
ldm_marshal_VOID__INT_POINTER,
G_TYPE_NONE, 2, G_TYPE_INT, G_TYPE_POINTER);
signals[AUTHENTICATION_RESULT] =
g_signal_new ("authentication-result",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PAMSessionClass, authentication_result),
NULL, NULL,
g_cclosure_marshal_VOID__INT,
G_TYPE_NONE, 1, G_TYPE_INT);
signals[ENDED] =
g_signal_new ("ended",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PAMSessionClass, ended),
NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
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