enlightenment/src/bin/e_desklock.c

/*
 * vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
 */
#include "e.h"
#ifdef HAVE_PAM
# include <security/pam_appl.h>
# include <pwd.h>
# include <limits.h>
#endif

#define E_DESKLOCK_STATE_DEFAULT 0
#define E_DESKLOCK_STATE_CHECKING 1
#define E_DESKLOCK_STATE_INVALID 2

#define ELOCK_POPUP_LAYER 10000
#define PASSWD_LEN 256

/**************************** private data ******************************/
typedef struct _E_Desklock_Data	      E_Desklock_Data;
typedef struct _E_Desklock_Popup_Data E_Desklock_Popup_Data;
#ifdef HAVE_PAM
typedef struct _E_Desklock_Auth       E_Desklock_Auth;
#endif

struct _E_Desklock_Popup_Data
{
   E_Popup     *popup_wnd;
   Evas_Object *bg_object;
   Evas_Object *login_box;
};

struct _E_Desklock_Data
{
   Eina_List	  *elock_wnd_list;
   Ecore_X_Window  elock_wnd;
   Eina_List	  *handlers;
   Ecore_X_Window  elock_grab_break_wnd;
   char		   passwd[PASSWD_LEN];
   int		   state;
};
#ifdef HAVE_PAM
struct _E_Desklock_Auth
{
   struct {
      struct pam_conv conv;
      pam_handle_t    *handle;
   } pam;

   char user[PATH_MAX];
   char passwd[PATH_MAX];
};
#endif

static	E_Desklock_Data *edd = NULL;
static	E_Zone *last_active_zone = NULL;
#ifdef HAVE_PAM
static Ecore_Event_Handler *_e_desklock_exit_handler = NULL;
static pid_t _e_desklock_child_pid = -1;
#endif
static Ecore_Exe *_e_custom_desklock_exe = NULL;
static Ecore_Event_Handler *_e_custom_desklock_exe_handler = NULL;
static Ecore_Poller *_e_desklock_idle_poller = NULL;
static int _e_desklock_user_idle = 0;
static double _e_desklock_autolock_time = 0.0;
static E_Dialog *_e_desklock_ask_presentation_dia = NULL;
static int _e_desklock_ask_presentation_count = 0;
static Ecore_Event_Handler *_e_desklock_handler_border_fullscreen = NULL;
static Ecore_Event_Handler *_e_desklock_handler_border_unfullscreen = NULL;
static int _e_desklock_fullscreen_count = 0;

/***********************************************************************/

static int _e_desklock_cb_key_down(void *data, int type, void *event);
static int _e_desklock_cb_mouse_down(void *data, int type, void *event);
static int _e_desklock_cb_mouse_up(void *data, int type, void *event);
static int _e_desklock_cb_mouse_wheel(void *data, int type, void *event);
static int _e_desklock_cb_mouse_move(void *data, int type, void *event);
static int _e_desklock_cb_custom_desklock_exit(void *data, int type, void *event);
static int _e_desklock_cb_idle_poller(void *data);

static void _e_desklock_null(void);
static void _e_desklock_passwd_update(void);
static void _e_desklock_backspace(void);
static void _e_desklock_delete(void);
static int  _e_desklock_zone_num_get(void);
static int _e_desklock_check_auth(void);
static void _e_desklock_state_set(int state);

#ifdef HAVE_PAM
static int _e_desklock_cb_exit(void *data, int type, void *event);
static int _desklock_auth(char *passwd);
static int _desklock_pam_init(E_Desklock_Auth *da);
static int _desklock_auth_pam_conv(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata_ptr);
static char *_desklock_auth_get_current_user(void);
static char *_desklock_auth_get_current_host(void);
#endif

static void _e_desklock_ask_presentation_mode(void);
static int _e_desklock_handler_border_fullscreen_cb(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__);
static int _e_desklock_handler_border_unfullscreen_cb(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__);

EAPI int E_EVENT_DESKLOCK = 0;

EAPI int
e_desklock_init(void)
{
   /* A poller to tick every 256 ticks, watching for an idle user */
   _e_desklock_idle_poller = ecore_poller_add(ECORE_POLLER_CORE, 256,
					      _e_desklock_cb_idle_poller, NULL);

   if (!_e_desklock_handler_border_fullscreen)
     _e_desklock_handler_border_fullscreen = ecore_event_handler_add
       (E_EVENT_BORDER_FULLSCREEN, _e_desklock_handler_border_fullscreen_cb, NULL);

   if (!_e_desklock_handler_border_unfullscreen)
     _e_desklock_handler_border_unfullscreen = ecore_event_handler_add
       (E_EVENT_BORDER_UNFULLSCREEN, _e_desklock_handler_border_unfullscreen_cb, NULL);

   if (e_config->desklock_background)
     e_filereg_register(e_config->desklock_background);

   E_EVENT_DESKLOCK = ecore_event_type_new();

   return 1;
}

EAPI int
e_desklock_shutdown(void)
{
   if (_e_desklock_handler_border_fullscreen)
     {
	ecore_event_handler_del(_e_desklock_handler_border_fullscreen);
	_e_desklock_handler_border_fullscreen = NULL;
     }

   if (_e_desklock_handler_border_unfullscreen)
     {
	ecore_event_handler_del(_e_desklock_handler_border_unfullscreen);
	_e_desklock_handler_border_unfullscreen = NULL;
     }

   e_desklock_hide();
   if (e_config->desklock_background)
     e_filereg_deregister(e_config->desklock_background);

   return 1;
}

static const char *
_user_wallpaper_get(void)
{
   const E_Config_Desktop_Background *cdbg;
   const Eina_List *l;

   if (e_config->desktop_default_background)
     return e_config->desktop_default_background;

   EINA_LIST_FOREACH(e_config->desktop_backgrounds, l, cdbg)
     if (cdbg->file)
       return cdbg->file;

   return e_theme_edje_file_get("base/theme/desklock",
				"e/desklock/background");
}

EAPI int
e_desklock_show_autolocked(void)
{
   if (_e_desklock_fullscreen_count > 0) return 0;
   if (_e_desklock_autolock_time < 1.0)
     _e_desklock_autolock_time = ecore_loop_time_get();
   return e_desklock_show();
}

EAPI int
e_desklock_show(void)
{
   Eina_List		  *managers, *l, *l2, *l3;
   E_Manager		  *man;
   E_Desklock_Popup_Data  *edp;
   Evas_Coord		  mw, mh;
   E_Zone		  *current_zone;
   int			  zone_counter;
   int			  total_zone_num;
   E_Event_Desklock      *ev;

   if (_e_custom_desklock_exe) return 0;

   if (e_config->desklock_use_custom_desklock)
     {
	_e_custom_desklock_exe_handler = ecore_event_handler_add(ECORE_EXE_EVENT_DEL,
							      _e_desklock_cb_custom_desklock_exit,
							      NULL);
        e_util_library_path_strip();
	_e_custom_desklock_exe = ecore_exe_run(e_config->desklock_custom_desklock_cmd, NULL);
        e_util_library_path_restore();
	return 1;
     }

#ifndef HAVE_PAM
   e_util_dialog_show(_("Error - no PAM support"),
		      _("No PAM support was built into Enlightenment, so<br>"
			"desk locking is disabled."));
   return 0;
#endif

   if (edd) return 0;

#ifdef HAVE_PAM
   if (e_config->desklock_auth_method == 1)
     {
#endif
       if (!e_config->desklock_personal_passwd)
	 {
	    E_Zone  *zone;

	    zone = e_util_zone_current_get(e_manager_current_get());
	    if (zone)
	      e_configure_registry_call("screen/screen_lock", zone->container, NULL);
	    return 0;
	 }
#ifdef HAVE_PAM
     }
#endif

   edd = E_NEW(E_Desklock_Data, 1);
   if (!edd) return 0;
   edd->elock_wnd = ecore_x_window_input_new(e_manager_current_get()->root,
					     0, 0, 1, 1);
   ecore_x_window_show(edd->elock_wnd);
   managers = e_manager_list();
   if (!e_grabinput_get(edd->elock_wnd, 0, edd->elock_wnd))
     {
	EINA_LIST_FOREACH(managers, l, man)
	  {
	     Ecore_X_Window *windows;
	     int wnum;

	     windows = ecore_x_window_children_get(man->root, &wnum);
	     if (windows)
	       {
		  int i;

		  for (i = 0; i < wnum; i++)
		    {
		       Ecore_X_Window_Attributes att;

		       memset(&att, 0, sizeof(Ecore_X_Window_Attributes));
		       ecore_x_window_attributes_get(windows[i], &att);
		       if (att.visible)
			 {
			    ecore_x_window_hide(windows[i]);
			    if (e_grabinput_get(edd->elock_wnd, 0, edd->elock_wnd))
			      {
				 edd->elock_grab_break_wnd = windows[i];
				 free(windows);
				 goto works;
			      }
			    ecore_x_window_show(windows[i]);
			 }
		    }
		  free(windows);
	       }
	  }
	/* everything failed - cant lock */
	e_util_dialog_show(_("Lock Failed"),
			   _("Locking the desktop failed because some application<br>"
			     "has grabbed either the keyboard or the mouse or both<br>"
			     "and their grab is unable to be broken."));
	ecore_x_window_free(edd->elock_wnd);
	free(edd);
	edd = NULL;
	return 0;
     }
   works:

   last_active_zone = current_zone =
     e_zone_current_get(e_container_current_get(e_manager_current_get()));

   zone_counter = 0;
   total_zone_num = _e_desklock_zone_num_get();
   EINA_LIST_FOREACH(managers, l, man)
     {
	E_Container *con;
	EINA_LIST_FOREACH(man->containers, l2, con)
	  {
	     E_Zone *zone;
	     EINA_LIST_FOREACH(con->zones, l3, zone)
	       {
		  edp = E_NEW(E_Desklock_Popup_Data, 1);
		  if (edp)
		    {
		       edp->popup_wnd = e_popup_new(zone, 0, 0, zone->w, zone->h);
		       evas_event_feed_mouse_move(edp->popup_wnd->evas, -1000000, -1000000,
						  ecore_x_current_time_get(), NULL);

		       e_popup_layer_set(edp->popup_wnd, ELOCK_POPUP_LAYER);
		       ecore_evas_raise(edp->popup_wnd->ecore_evas);

		       evas_event_freeze(edp->popup_wnd->evas);
		       edp->bg_object = edje_object_add(edp->popup_wnd->evas);

		       if ((!e_config->desklock_background) ||
			   (!strcmp(e_config->desklock_background, "theme_desklock_background")))
			 {
			   e_theme_edje_object_set(edp->bg_object,
						   "base/theme/desklock",
						   "e/desklock/background");
			 }
		       else if (!strcmp(e_config->desklock_background, "theme_background"))
			 {
			    e_theme_edje_object_set(edp->bg_object,
						    "base/theme/backgrounds",
						    "e/desktop/background");
			 }
		       else
			 {
			   const char *f;

			   if (!strcmp(e_config->desklock_background, "user_background"))
			     f = _user_wallpaper_get();
			   else
			     f = e_config->desklock_background;

			   if (e_util_edje_collection_exists(f, "e/desklock/background"))
			     {
			       edje_object_file_set(edp->bg_object, f,
						    "e/desklock/background");
			     }
			   else
			     {
			       if (!edje_object_file_set(edp->bg_object,
							 f, "e/desktop/background"))
				 {
				   edje_object_file_set(edp->bg_object,
							e_theme_edje_file_get("base/theme/desklock",
									      "e/desklock/background"),
							"e/desklock/background");
				 }
			     }
			 }

		       evas_object_move(edp->bg_object, 0, 0);
		       evas_object_resize(edp->bg_object, zone->w, zone->h);
		       evas_object_show(edp->bg_object);
		       edp->login_box = edje_object_add(edp->popup_wnd->evas);
		       e_theme_edje_object_set(edp->login_box,
					       "base/theme/desklock",
					       "e/desklock/login_box");
		       edje_object_part_text_set(edp->login_box, "e.text.title",
						 _("Please enter your unlock password"));
		       edje_object_size_min_calc(edp->login_box, &mw, &mh);
		       if (edje_object_part_exists(edp->bg_object, "e.swallow.login_box"))
			 {
			    edje_extern_object_min_size_set(edp->login_box, mw, mh);
			    edje_object_part_swallow(edp->bg_object, "e.swallow.login_box", edp->login_box);
			 }
		       else
			 {
			    evas_object_resize(edp->login_box, mw, mh);
			    evas_object_move(edp->login_box,
					     ((zone->w - mw) / 2),
					     ((zone->h - mh) / 2));
			 }
		       if (total_zone_num > 1)
			 {
			    if (e_config->desklock_login_box_zone == -1)
			      evas_object_show(edp->login_box);
			    else if ((e_config->desklock_login_box_zone == -2) &&
				     (zone == current_zone))
			      evas_object_show(edp->login_box);
			    else if (e_config->desklock_login_box_zone == zone_counter)
			      evas_object_show(edp->login_box);
			 }
		       else
			 evas_object_show(edp->login_box);
		       /**/

		       e_popup_edje_bg_object_set(edp->popup_wnd, edp->bg_object);
		       evas_event_thaw(edp->popup_wnd->evas);

		       e_popup_show(edp->popup_wnd);

		       edd->elock_wnd_list = eina_list_append(edd->elock_wnd_list, edp);
		    }
		  zone_counter++;
	       }
	  }
     }

   /* handlers */
   edd->handlers = eina_list_append(edd->handlers,
				    ecore_event_handler_add(ECORE_EVENT_KEY_DOWN,
							    _e_desklock_cb_key_down, NULL));
   edd->handlers = eina_list_append(edd->handlers,
				    ecore_event_handler_add(ECORE_EVENT_MOUSE_BUTTON_DOWN,
							    _e_desklock_cb_mouse_down, NULL));
   edd->handlers = eina_list_append(edd->handlers,
				    ecore_event_handler_add(ECORE_EVENT_MOUSE_BUTTON_UP,
							    _e_desklock_cb_mouse_up, NULL));
   edd->handlers = eina_list_append(edd->handlers,
				    ecore_event_handler_add(ECORE_EVENT_MOUSE_WHEEL,
							    _e_desklock_cb_mouse_wheel,
							    NULL));
   if ((total_zone_num > 1) && (e_config->desklock_login_box_zone == -2))
     edd->handlers = eina_list_append(edd->handlers,
				      ecore_event_handler_add(ECORE_EVENT_MOUSE_MOVE,
							      _e_desklock_cb_mouse_move,
							      NULL));
   _e_desklock_passwd_update();

   ev = E_NEW(E_Event_Desklock, 1);
   ev->on = 1;
   ecore_event_add(E_EVENT_DESKLOCK, ev, NULL, NULL);
   return 1;
}

EAPI void
e_desklock_hide(void)
{
   E_Desklock_Popup_Data *edp;
   E_Event_Desklock      *ev;

   if ((!edd) && (!_e_custom_desklock_exe)) return;

   if (e_config->desklock_use_custom_desklock)
     {
	_e_custom_desklock_exe = NULL;
	return;
     }

   if (edd->elock_grab_break_wnd)
     ecore_x_window_show(edd->elock_grab_break_wnd);

   EINA_LIST_FREE(edd->elock_wnd_list, edp)
     {
	if (edp)
	  {
	     e_popup_hide(edp->popup_wnd);

	     evas_event_freeze(edp->popup_wnd->evas);
	     evas_object_del(edp->bg_object);
	     evas_object_del(edp->login_box);
	     evas_event_thaw(edp->popup_wnd->evas);

	     e_util_defer_object_del(E_OBJECT(edp->popup_wnd));
	     E_FREE(edp);
	  }
     }

   E_FREE_LIST(edd->handlers, ecore_event_handler_del);

   e_grabinput_release(edd->elock_wnd, edd->elock_wnd);
   ecore_x_window_free(edd->elock_wnd);

   E_FREE(edd);
   edd = NULL;

   ev = E_NEW(E_Event_Desklock, 1);
   ev->on = 0;
   ecore_event_add(E_EVENT_DESKLOCK, ev, NULL, NULL);

   if (_e_desklock_autolock_time > 0.0)
     {
	if ((e_config->desklock_ask_presentation) &&
	    (e_config->desklock_ask_presentation_timeout > 0.0))
	  {
	     double max, now;

	     now = ecore_loop_time_get();
	     max = _e_desklock_autolock_time + e_config->desklock_ask_presentation_timeout;
	     if (now <= max)
	       _e_desklock_ask_presentation_mode();
	  }
	else
	  _e_desklock_ask_presentation_count = 0;

	_e_desklock_autolock_time = 0.0;
     }
}

static int
_e_desklock_cb_key_down(void *data __UNUSED__, int type __UNUSED__, void *event)
{
   Ecore_Event_Key *ev = event;
   if (ev->window != edd->elock_wnd || edd->state == E_DESKLOCK_STATE_CHECKING) return 1;

   if (!strcmp(ev->key, "Escape"))
     ;
   else if (!strcmp(ev->key, "KP_Enter"))
     _e_desklock_check_auth();
   else if (!strcmp(ev->key, "Return"))
     _e_desklock_check_auth();
   else if (!strcmp(ev->key, "BackSpace"))
     _e_desklock_backspace();
   else if (!strcmp(ev->key, "Delete"))
     _e_desklock_delete();
   else if (!strcmp(ev->key, "u") && (ev->modifiers & ECORE_EVENT_MODIFIER_CTRL))
     _e_desklock_null();
   else
     {
	/* here we have to grab a password */
	if (ev->compose)
	  {
	     if ((strlen(edd->passwd) < (PASSWD_LEN - strlen(ev->compose))))
	       {
		  strcat(edd->passwd, ev->compose);
		  _e_desklock_passwd_update();
	       }
	  }
     }

   return 1;
}

static int
_e_desklock_cb_mouse_down(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__)
{
   return 1;
}

static int
_e_desklock_cb_mouse_up(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__)
{
   return 1;
}

static int
_e_desklock_cb_mouse_wheel(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__)
{
   return 1;
}

static int
_e_desklock_cb_mouse_move(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__)
{
   E_Desklock_Popup_Data *edp;
   E_Zone *current_zone;
   Eina_List *l;

   current_zone = e_zone_current_get(e_container_current_get(e_manager_current_get()));

   if (current_zone == last_active_zone)
     return 1;

   EINA_LIST_FOREACH(edd->elock_wnd_list, l, edp)
     {
	if (!edp) continue;

	if (edp->popup_wnd->zone == last_active_zone)
	  evas_object_hide(edp->login_box);
	else if (edp->popup_wnd->zone == current_zone)
	  evas_object_show(edp->login_box);
     }
   last_active_zone = current_zone;
   return 1;
}

static void
_e_desklock_passwd_update(void)
{
   char passwd_hidden[PASSWD_LEN] = "", *p, *pp;
   E_Desklock_Popup_Data *edp;
   Eina_List *l;

   if (!edd) return;

   for (p = edd->passwd, pp = passwd_hidden; *p; p++, pp++)
     *pp = '*';
   *pp = 0;

   EINA_LIST_FOREACH(edd->elock_wnd_list, l, edp)
     {
	edje_object_part_text_set(edp->login_box, "e.text.password",
				  passwd_hidden);
     }
}

static void
_e_desklock_null(void)
{
   memset(edd->passwd, 0, sizeof(char) * PASSWD_LEN);
   _e_desklock_passwd_update();
}

static void
_e_desklock_backspace(void)
{
   int len, val, pos;

   if (!edd) return;

   len = strlen(edd->passwd);
   if (len > 0)
     {
	pos = evas_string_char_prev_get(edd->passwd, len, &val);
	if ((pos < len) && (pos >= 0))
	  {
	     edd->passwd[pos] = 0;
	     _e_desklock_passwd_update();
	  }
     }
}

static void
_e_desklock_delete(void)
{
   _e_desklock_backspace();
}

static int
_e_desklock_zone_num_get(void)
{
   int num;
   Eina_List *l, *l2;
   E_Manager *man;

   num = 0;
   EINA_LIST_FOREACH(e_manager_list(), l, man)
     {
	E_Container *con;
	EINA_LIST_FOREACH(man->containers, l2, con)
	  {
	     num += eina_list_count(con->zones);
	  }
     }

   return num;
}

static int
_e_desklock_check_auth(void)
{
   if (!edd) return 0;
#ifdef HAVE_PAM
   if (e_config->desklock_auth_method == 0)
     return _desklock_auth(edd->passwd);
   else if (e_config->desklock_auth_method == 1)
     {
#endif
	if ((e_config->desklock_personal_passwd) &&
	    (!strcmp(edd->passwd == NULL ? "" : edd->passwd,
		     e_config->desklock_personal_passwd == NULL ? "" :
		     e_config->desklock_personal_passwd)))
	  {
	     /* password ok */
	     /* security - null out passwd string once we are done with it */
	     memset(edd->passwd, 0, sizeof(char) * PASSWD_LEN);
	     e_desklock_hide();
	     return 1;
	  }
#ifdef HAVE_PAM
     }
#endif
   /* password is definitely wrong */
   _e_desklock_state_set(E_DESKLOCK_STATE_INVALID);
   _e_desklock_null();
   return 0;
}

static void
_e_desklock_state_set(int state)
{
   Eina_List *l;
   E_Desklock_Popup_Data *edp;
   const char *signal, *text;
   if (!edd) return;

   edd->state = state;
   if (state == E_DESKLOCK_STATE_CHECKING)
     {
	signal = "e,state,checking";
	text = "Authenticating...";
     }
   else if (state == E_DESKLOCK_STATE_INVALID)
     {
	signal = "e,state,invalid";
	text = "The password you entered is invalid. Try again.";
     }
   else
     return;

   EINA_LIST_FOREACH(edd->elock_wnd_list, l, edp)
     {
	edje_object_signal_emit(edp->login_box, signal, "e.desklock");
	edje_object_signal_emit(edp->bg_object, signal, "e.desklock");
	edje_object_part_text_set(edp->login_box, "e.text.title", text);
     }
}


#ifdef HAVE_PAM
static int
_e_desklock_cb_exit(void *data __UNUSED__, int type __UNUSED__, void *event)
{
   Ecore_Exe_Event_Del *ev = event;
   if (ev->pid == _e_desklock_child_pid)
     {
	_e_desklock_child_pid = -1;
	/* ok */
	if (ev->exit_code == 0)
	  {
	     /* security - null out passwd string once we are done with it */
	     memset(edd->passwd, 0, sizeof(char) * PASSWD_LEN);
	     e_desklock_hide();
	  }
	/* error */
	else if (ev->exit_code < 128)
	  {
	     /* security - null out passwd string once we are done with it */
	     memset(edd->passwd, 0, sizeof(char) * PASSWD_LEN);
	     e_desklock_hide();
	     e_util_dialog_show(_("Authentication System Error"),
				_("Authentication via PAM had errors setting up the<br>"
				  "authentication session. The error code was <hilight>%i</hilight>.<br>"
				  "This is bad and should not be happening. Please report this bug.")
				, ev->exit_code);
	  }
	/* failed auth */
	else
	  {
	     _e_desklock_state_set(E_DESKLOCK_STATE_INVALID);
	     /* security - null out passwd string once we are done with it */
	     _e_desklock_null();
	  }
	if (_e_desklock_exit_handler) ecore_event_handler_del(_e_desklock_exit_handler);
	_e_desklock_exit_handler = NULL;
     }
   return 1;
}

static int
_desklock_auth(char *passwd)
{
   _e_desklock_state_set(E_DESKLOCK_STATE_CHECKING);
   _e_desklock_child_pid = fork();
   if (_e_desklock_child_pid > 0)
     {
	/* parent */
	_e_desklock_exit_handler =
	  ecore_event_handler_add(ECORE_EXE_EVENT_DEL, _e_desklock_cb_exit,
				  NULL);
     }
   else if (_e_desklock_child_pid == 0)
     {
	/* child */
	int pamerr;
	E_Desklock_Auth da;
        char *current_user, *p;
	struct sigaction action;

	action.sa_handler = SIG_DFL;
	action.sa_flags = SA_ONSTACK | SA_NODEFER | SA_RESETHAND | SA_SIGINFO;
	sigemptyset(&action.sa_mask);
	sigaction(SIGSEGV, &action, NULL);
	sigaction(SIGILL, &action, NULL);
	sigaction(SIGFPE, &action, NULL);
	sigaction(SIGBUS, &action, NULL);
	sigaction(SIGABRT, &action, NULL);

	current_user = _desklock_auth_get_current_user();
	eina_strlcpy(da.user, current_user, PATH_MAX);
	eina_strlcpy(da.passwd, passwd, PATH_MAX);
	/* security - null out passwd string once we are done with it */
	for (p = passwd; *p; p++) *p = 0;
	da.pam.handle = NULL;
	da.pam.conv.conv = NULL;
	da.pam.conv.appdata_ptr = NULL;

	pamerr = _desklock_pam_init(&da);
	if (pamerr != PAM_SUCCESS)
	  {
	     free(current_user);
	     exit(pamerr);
	  }
	pamerr = pam_authenticate(da.pam.handle, 0);
	pam_end(da.pam.handle, pamerr);
	/* security - null out passwd string once we are done with it */
	memset(da.passwd, 0, sizeof(da.passwd));
	if (pamerr == PAM_SUCCESS)
	  {
	     free(current_user);
	     exit(0);
	  }
	free(current_user);
	exit(-1);
     }
   else
     {
	_e_desklock_state_set(E_DESKLOCK_STATE_INVALID);
	return 0;
     }
   return 1;
}

static char *
_desklock_auth_get_current_user(void)
{
   char *user;
   struct passwd *pwent = NULL;

   pwent = getpwuid(getuid());
   user = strdup(pwent->pw_name);
   return user;
}

static int
_desklock_pam_init(E_Desklock_Auth *da)
{
   int pamerr;
   const char *pam_prof;
   char *current_host;
   char *current_user;

   if (!da) return -1;

   da->pam.conv.conv = _desklock_auth_pam_conv;
   da->pam.conv.appdata_ptr = da;
   da->pam.handle = NULL;

   /* try other pam profiles - and system-auth (login for fbsd users) is a fallback */
   pam_prof = "login";
   if (ecore_file_exists("/etc/pam.d/enlightenment"))
     pam_prof = "enlightenment";
   else if (ecore_file_exists("/etc/pam.d/xscreensaver"))
     pam_prof = "xscreensaver";
   else if (ecore_file_exists("/etc/pam.d/kscreensaver"))
     pam_prof = "kscreensaver";
   else if (ecore_file_exists("/etc/pam.d/system-auth"))
     pam_prof = "system-auth";
   else if (ecore_file_exists("/etc/pam.d/system"))
     pam_prof = "system";
   else if (ecore_file_exists("/etc/pam.d/xdm"))
     pam_prof = "xdm";
   else if (ecore_file_exists("/etc/pam.d/gdm"))
     pam_prof = "gdm";
   else if (ecore_file_exists("/etc/pam.d/kdm"))
     pam_prof = "kdm";

   if ((pamerr = pam_start(pam_prof, da->user, &(da->pam.conv),
			   &(da->pam.handle))) != PAM_SUCCESS)
     return pamerr;

   current_user = _desklock_auth_get_current_user();

   if ((pamerr = pam_set_item(da->pam.handle, PAM_USER, current_user)) != PAM_SUCCESS)
     {
       free(current_user);
       return pamerr;
     }

   current_host = _desklock_auth_get_current_host();
   if ((pamerr = pam_set_item(da->pam.handle, PAM_RHOST, current_host)) != PAM_SUCCESS)
     {
       free(current_user);
       free(current_host);
       return pamerr;
     }

   free(current_user);
   free(current_host);
   return 0;
}

static int
_desklock_auth_pam_conv(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata_ptr)
{
   int replies = 0;
   E_Desklock_Auth *da = (E_Desklock_Auth *)appdata_ptr;
   struct pam_response *reply = NULL;

   reply = (struct pam_response *)malloc(sizeof(struct pam_response) *num_msg);

   if (!reply)
     return PAM_CONV_ERR;

   for (replies = 0; replies < num_msg; replies++)
     {
	switch (msg[replies]->msg_style)
	  {
	   case PAM_PROMPT_ECHO_ON:
	     reply[replies].resp_retcode = PAM_SUCCESS;
	     reply[replies].resp = strdup(da->user);
	     break;
	   case PAM_PROMPT_ECHO_OFF:
	     reply[replies].resp_retcode = PAM_SUCCESS;
	     reply[replies].resp = strdup(da->passwd);
	     break;
	   case PAM_ERROR_MSG:
	   case PAM_TEXT_INFO:
	     reply[replies].resp_retcode = PAM_SUCCESS;
	     reply[replies].resp = NULL;
	     break;
	   default:
	     free(reply);
	     return PAM_CONV_ERR;
	  }
     }
   *resp = reply;
   return PAM_SUCCESS;
}

static char *
_desklock_auth_get_current_host(void)
{
   return strdup("localhost");
}
#endif

static int
_e_desklock_cb_custom_desklock_exit(void *data __UNUSED__, int type __UNUSED__, void *event)
{
   Ecore_Exe_Event_Del *ev = event;
   if (ev->exe != _e_custom_desklock_exe) return 1;

   if (ev->exit_code != 0)
     {
	/* do something profound here... like notify someone */
     }

   e_desklock_hide();

   return 0;
}

static int
_e_desklock_cb_idle_poller(void *data __UNUSED__)
{
   if ((e_config->desklock_autolock_idle) && (!e_config->mode.presentation) &&
       (_e_desklock_fullscreen_count <= 0))
     {
	double idle, max;

	/* If a desklock is already up, bail */
        if ((_e_custom_desklock_exe) || (edd)) return 1;

	idle = ecore_x_screensaver_idle_time_get();
	max = e_config->desklock_autolock_idle_timeout;
	if (_e_desklock_ask_presentation_count > 0)
	  max *= (1 + _e_desklock_ask_presentation_count);

	/* If we have exceeded our idle time... */
        if (idle >= max)
	  {
	     /*
	      * Unfortunately, not all "desklocks" stay up for as long as
	      * the user is idle or until it is unlocked.
	      *
	      * 'xscreensaver-command -lock' for example sends a command
	      * to xscreensaver and then terminates.  So, we have another
	      * check (_e_desklock_user_idle) which lets us know that we
	      * have locked the screen due to idleness.
	      */
	     if (!_e_desklock_user_idle)
	       {
	          _e_desklock_user_idle = 1;
                  e_desklock_show_autolocked();
	       }
	  }
	else
	  _e_desklock_user_idle = 0;
     }

   /* Make sure our poller persists. */
   return 1;
}

static void
_e_desklock_ask_presentation_del(void *data)
{
   if (_e_desklock_ask_presentation_dia == data)
     _e_desklock_ask_presentation_dia = NULL;
}

static void
_e_desklock_ask_presentation_yes(void *data __UNUSED__, E_Dialog *dia)
{
   e_config->mode.presentation = 1;
   e_config_mode_changed();
   e_config_save_queue();
   e_object_del(E_OBJECT(dia));
   _e_desklock_ask_presentation_count = 0;
}

static void
_e_desklock_ask_presentation_no(void *data __UNUSED__, E_Dialog *dia)
{
   e_object_del(E_OBJECT(dia));
   _e_desklock_ask_presentation_count = 0;
}

static void
_e_desklock_ask_presentation_no_increase(void *data __UNUSED__, E_Dialog *dia)
{
   int timeout, interval, blanking, expose;

   _e_desklock_ask_presentation_count++;
   timeout = e_config->screensaver_timeout * _e_desklock_ask_presentation_count;
   interval = e_config->screensaver_interval;
   blanking = e_config->screensaver_blanking;
   expose = e_config->screensaver_expose;

   ecore_x_screensaver_set(timeout, interval, blanking, expose);
   e_object_del(E_OBJECT(dia));
}

static void
_e_desklock_ask_presentation_no_forever(void *data __UNUSED__, E_Dialog *dia)
{
   e_config->desklock_ask_presentation = 0;
   e_config_save_queue();
   e_object_del(E_OBJECT(dia));
   _e_desklock_ask_presentation_count = 0;
}

static void
_e_desklock_ask_presentation_key_down(void *data, Evas *e __UNUSED__, Evas_Object *o __UNUSED__, void *event)
{
   Evas_Event_Key_Down *ev = event;
   E_Dialog *dia = data;

   if (strcmp(ev->keyname, "Return") == 0)
     _e_desklock_ask_presentation_yes(NULL, dia);
   else if (strcmp(ev->keyname, "Escape") == 0)
     _e_desklock_ask_presentation_no(NULL, dia);
}

static void
_e_desklock_ask_presentation_mode(void)
{
   E_Manager *man;
   E_Container *con;
   E_Dialog *dia;

   if (_e_desklock_ask_presentation_dia)
     return;

   man = e_manager_current_get();
   if (!man) return;
   con = e_container_current_get(man);
   if (!con) return;
   dia = e_dialog_new(con, "E", "_desklock_ask_presentation");
   if (!dia) return;

   e_dialog_title_set(dia, _("Activate Presentation Mode?"));
   e_dialog_icon_set(dia, "dialog-ask", 64);
   e_dialog_text_set
     (dia,
      _("You unlocked desktop too fast.<br><br>"
	"Would you like to enable <b>presentation</b> mode and "
	"temporarily disable screen saver, lock and power saving?"));

   e_object_del_attach_func_set
     (E_OBJECT(dia), _e_desklock_ask_presentation_del);
   e_dialog_button_add
     (dia, _("Yes"), NULL, _e_desklock_ask_presentation_yes, NULL);
   e_dialog_button_add
     (dia, _("No"), NULL, _e_desklock_ask_presentation_no, NULL);
   e_dialog_button_add
     (dia, _("No, but increase timeout"), NULL,
      _e_desklock_ask_presentation_no_increase, NULL);
   e_dialog_button_add
     (dia, _("No, and stop asking"), NULL,
      _e_desklock_ask_presentation_no_forever, NULL);

   e_dialog_button_focus_num(dia, 0);
   e_widget_list_homogeneous_set(dia->box_object, 0);
   e_win_centered_set(dia->win, 1);
   e_dialog_show(dia);

   evas_object_event_callback_add
     (dia->bg_object, EVAS_CALLBACK_KEY_DOWN,
      _e_desklock_ask_presentation_key_down, dia);

   _e_desklock_ask_presentation_dia = dia;
}

static int
_e_desklock_handler_border_fullscreen_cb(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__)
{
   _e_desklock_fullscreen_count++;
   if (_e_desklock_fullscreen_count == 1) e_desklock_init();
   return 1;
}

static int
_e_desklock_handler_border_unfullscreen_cb(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__)
{
   _e_desklock_fullscreen_count--;
   if (_e_desklock_fullscreen_count == 0) e_desklock_init();
   else if (_e_desklock_fullscreen_count < 0) _e_desklock_fullscreen_count = 0;
   return 1;
}