summaryrefslogtreecommitdiff
path: root/src/mate-screensaver-dialog.c
blob: 06ea62ac88611328f19f43f1478f0c8e8a46133a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2004-2006 William Jon McCann <mccann@jhu.edu>
 *
 * 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 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * Authors: William Jon McCann <mccann@jhu.edu>
 *
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <signal.h>

#include <glib/gi18n.h>
#include <gdk/gdkx.h>
#include <gtk/gtk.h>
#include <gtk/gtkx.h>

#include "gs-lock-plug.h"

#include "gs-auth.h"
#include "setuid.h"

#include "gs-debug.h"

#define MAX_FAILURES 5

static gboolean verbose = FALSE;
static gboolean show_version = FALSE;
static gboolean enable_logout = FALSE;
static gboolean enable_switch = FALSE;
static char* logout_command = NULL;
static char* status_message = NULL;
static char* away_message = NULL;

static GOptionEntry entries[] = {
	{"verbose", 0, 0, G_OPTION_ARG_NONE, &verbose, N_("Show debugging output"), NULL},
	{"version", 0, 0, G_OPTION_ARG_NONE, &show_version, N_("Version of this application"), NULL},
	{"enable-logout", 0, 0, G_OPTION_ARG_NONE, &enable_logout, N_("Show the logout button"), NULL},
	{"logout-command", 0, 0, G_OPTION_ARG_STRING, &logout_command, N_("Command to invoke from the logout button"), NULL},
	{"enable-switch", 0, 0, G_OPTION_ARG_NONE, &enable_switch, N_("Show the switch user button"), NULL},
	{"status-message", 0, 0, G_OPTION_ARG_STRING, &status_message, N_("Message to show in the dialog"), N_("MESSAGE")},
	{"away-message", 0, 0, G_OPTION_ARG_STRING, &away_message, N_("Not used"), N_("MESSAGE")},
	{NULL}
};

static char* get_id_string(GtkWidget* widget)
{
	char* id = NULL;

	g_return_val_if_fail(widget != NULL, NULL);
	g_return_val_if_fail(GTK_IS_WIDGET(widget), NULL);

	id = g_strdup_printf("%" G_GUINT32_FORMAT, (guint32) GDK_WINDOW_XID(gtk_widget_get_window(widget)));
	return id;
}

static gboolean print_id(GtkWidget* widget)
{
	char* id;

	gs_profile_start(NULL);

	id = get_id_string(widget);
	printf("WINDOW ID=%s\n", id);
	fflush(stdout);

	gs_profile_end(NULL);

	g_free(id);

	return FALSE;
}

static void response_cancel(void)
{
	printf("RESPONSE=CANCEL\n");
	fflush(stdout);
}

static void response_ok(void)
{
	printf("RESPONSE=OK\n");
	fflush(stdout);
}

static gboolean quit_response_ok(gpointer data)
{
	(void)data;			/* remove warning unused parameter ‘data’ */
	response_ok();
	gtk_main_quit();
	return FALSE;
}

static gboolean quit_response_cancel(void)
{
	response_cancel();
	gtk_main_quit();
	return FALSE;
}

static void response_lock_init_failed(void)
{
	/* if we fail to lock then we should drop the dialog */
	response_ok();
}

static char* request_response(GSLockPlug* plug, const char* prompt, gboolean visible)
{
	int response;
	char* text;

	gs_lock_plug_set_sensitive(plug, TRUE);
	gs_lock_plug_enable_prompt(plug, prompt, visible);
	response = gs_lock_plug_run(plug);

	gs_debug ("got response: %d", response);

	text = NULL;

	if (response == GS_LOCK_PLUG_RESPONSE_OK)
	{
		gs_lock_plug_get_text(plug, &text);
	}

	gs_lock_plug_disable_prompt(plug);

	return text;
}

/* Adapted from MDM2 daemon/verify-pam.c on 2006-06-13 */
static const char* maybe_translate_message(const char* msg)
{
	char* s;
	const char* ret;
	static GHashTable* hash = NULL;

	if (hash == NULL)
	{
		/* Here we come with some fairly standard messages so that
		   we have as much as possible translated.  Should really be
		   translated in pam I suppose.  This way we can "change"
		   some of these messages to be more sane. */
		hash = g_hash_table_new (g_str_hash, g_str_equal);
		/* login: is whacked always translate to Username: */
		g_hash_table_insert(hash, "login:", _("Username:"));
		g_hash_table_insert(hash, "Username:", _("Username:"));
		g_hash_table_insert(hash, "username:", _("Username:"));
		g_hash_table_insert(hash, "Password:", _("Password:"));
		g_hash_table_insert(hash, "password:", _("Password:"));
		g_hash_table_insert(hash, "You are required to change your password immediately (password aged)", _("You are required to change your password immediately (password aged)"));
		g_hash_table_insert(hash, "You are required to change your password immediately (root enforced)", _("You are required to change your password immediately (root enforced)"));
		g_hash_table_insert(hash, "Your account has expired; please contact your system administrator", _("Your account has expired; please contact your system administrator"));
		g_hash_table_insert(hash, "No password supplied", _("No password supplied"));
		g_hash_table_insert(hash, "Password unchanged", _("Password unchanged"));
		g_hash_table_insert(hash, "Can not get username", _("Can not get username"));
		g_hash_table_insert(hash, "Retype new UNIX password:", _("Retype new UNIX password:"));
		g_hash_table_insert(hash, "Enter new UNIX password:", _("Enter new UNIX password:"));
		g_hash_table_insert(hash, "(current) UNIX password:", _("(current) UNIX password:"));
		g_hash_table_insert(hash, "Error while changing NIS password.", _("Error while changing NIS password."));
		g_hash_table_insert(hash, "You must choose a longer password", _("You must choose a longer password"));
		g_hash_table_insert(hash, "Password has been already used. Choose another.", _("Password has been already used. Choose another."));
		g_hash_table_insert(hash, "You must wait longer to change your password", _("You must wait longer to change your password"));
		g_hash_table_insert(hash, "Sorry, passwords do not match", _("Sorry, passwords do not match"));
		/* FIXME: what about messages which have some variables in them, perhaps try to do those as well */
	}

	s = g_strstrip(g_strdup(msg));
	ret = g_hash_table_lookup(hash, s);
	g_free(s);

	if (ret != NULL)
	{
		return ret;
	}
	else
	{
		return msg;
	}
}

static gboolean auth_message_handler(GSAuthMessageStyle style, const char* msg, char** response, gpointer data)
{
	gboolean ret;
	GSLockPlug* plug;
	const char* message;

	plug = GS_LOCK_PLUG(data);

	gs_profile_start(NULL);
	gs_debug("Got message style %d: '%s'", style, msg);

	gtk_widget_show(GTK_WIDGET(plug));
	gs_lock_plug_set_ready(plug);

	ret = TRUE;
	*response = NULL;
	message = maybe_translate_message(msg);

	switch (style)
	{
		case GS_AUTH_MESSAGE_PROMPT_ECHO_ON:
			if (msg != NULL)
			{
				char *resp;
				resp = request_response(plug, message, TRUE);
				*response = resp;
			}
			break;
		case GS_AUTH_MESSAGE_PROMPT_ECHO_OFF:
			if (msg != NULL)
			{
				char *resp;
				resp = request_response(plug, message, FALSE);
				*response = resp;
			}
			break;
		case GS_AUTH_MESSAGE_ERROR_MSG:
			gs_lock_plug_show_message(plug, message);
			break;
		case GS_AUTH_MESSAGE_TEXT_INFO:
			gs_lock_plug_show_message(plug, message);
			break;
		default:
			g_assert_not_reached();
	}

	if (*response == NULL)
	{
		gs_debug("Got no response");
		ret = FALSE;
	}
	else
	{
		gs_lock_plug_show_message(plug, _("Checking..."));
		gs_lock_plug_set_sensitive(plug, FALSE);
	}

	/* we may have pending events that should be processed before continuing back into PAM */
	while (gtk_events_pending())
	{
		gtk_main_iteration();
	}

	gs_lock_plug_set_busy(plug);
	gs_profile_end(NULL);

	return ret;
}

static gboolean reset_idle_cb(GSLockPlug* plug)
{
	gs_lock_plug_set_sensitive(plug, TRUE);
	gs_lock_plug_show_message(plug, NULL);

	return FALSE;
}

static gboolean do_auth_check(GSLockPlug* plug)
{
	GError* error;
	gboolean res;

	error = NULL;

	gs_lock_plug_disable_prompt(plug);
	gs_lock_plug_set_busy(plug);
	res = gs_auth_verify_user(g_get_user_name(), g_getenv("DISPLAY"), auth_message_handler, plug, &error);

	gs_debug("Verify user returned: %s", res ? "TRUE" : "FALSE");

	if (! res)
	{
		if (error != NULL)
		{
			gs_debug("Verify user returned error: %s", error->message);
			gs_lock_plug_show_message(plug, error->message);
		}
		else
		{
			gs_lock_plug_show_message(plug, _("Authentication failed."));
		}

		printf("NOTICE=AUTH FAILED\n");
		fflush(stdout);

		if (error != NULL)
		{
			g_error_free(error);
		}
	}

	return res;
}

static void response_cb(GSLockPlug* plug, gint response_id)
{
	if ((response_id == GS_LOCK_PLUG_RESPONSE_CANCEL) || (response_id == GTK_RESPONSE_DELETE_EVENT))
	{
		quit_response_cancel();
	}
}

static gboolean response_request_quit(gpointer data)
{
	(void)data;			/* remove warning unused parameter ‘data’ */
	printf("REQUEST QUIT\n");
	fflush(stdout);
	return FALSE;
}

static gboolean quit_timeout_cb(gpointer data)
{
	gtk_main_quit();
	return FALSE;
}

static gboolean auth_check_idle(gpointer data)
{
	GSLockPlug* plug = data;
	gboolean res;
	gboolean again;
	static guint loop_counter = 0;

	again = TRUE;
	res = do_auth_check(plug);

	if (res)
	{
		again = FALSE;
		g_idle_add (quit_response_ok, NULL);
	}
	else
	{
		loop_counter++;

		if (loop_counter < MAX_FAILURES)
		{
			gs_debug ("Authentication failed, retrying (%u)", loop_counter);
			g_timeout_add (3000, (GSourceFunc) reset_idle_cb, plug);
		}
		else
		{
			gs_debug ("Authentication failed, quitting (max failures)");
			again = FALSE;
			/* Don't quit immediately, but rather request that mate-screensaver
			 * terminates us after it has finished the dialog shake. Time out
			 * after 5 seconds and quit anyway if this doesn't happen though */
			g_idle_add (response_request_quit, NULL);
			g_timeout_add(5000, (GSourceFunc) quit_timeout_cb, NULL);
		}
	}

	return again;
}

static void show_cb(GtkWidget* widget, gpointer data)
{
	print_id(widget);
}

static gboolean popup_dialog_idle(gpointer data)
{
	GtkWidget* widget;

	(void)data;			/* remove warning unused parameter ‘data’ */
	gs_profile_start(NULL);

	widget = gs_lock_plug_new();

	if (enable_logout)
	{
		g_object_set(widget, "logout-enabled", TRUE, NULL);
	}

	if (logout_command)
	{
		g_object_set(widget, "logout-command", logout_command, NULL);
	}

	if (enable_switch)
	{
		g_object_set(widget, "switch-enabled", TRUE, NULL);
	}

	if (status_message)
	{
		g_object_set(widget, "status-message", status_message, NULL);
	}

	g_signal_connect(GS_LOCK_PLUG(widget), "response", G_CALLBACK(response_cb), NULL);
	g_signal_connect(widget, "show", G_CALLBACK(show_cb), NULL);

	gtk_widget_realize(widget);

	g_idle_add(auth_check_idle, widget);

	gs_profile_end(NULL);

	return FALSE;
}


/*
 * Copyright (c) 1991-2004 Jamie Zawinski <jwz@jwz.org>
 * Copyright (c) 2005 William Jon McCann <mccann@jhu.edu>
 *
 * Initializations that potentially take place as a priveleged user:
   If the executable is setuid root, then these initializations
   are run as root, before discarding privileges.
*/
static gboolean privileged_initialization(int* argc, char** argv, gboolean verbose)
{
	gboolean ret;
	char* nolock_reason;
	char* orig_uid;
	char* uid_message;

	gs_profile_start(NULL);

	#ifndef NO_LOCKING
		/* before hack_uid () for proper permissions */
		gs_auth_priv_init();
	#endif /* NO_LOCKING */

	ret = hack_uid(&nolock_reason, &orig_uid, &uid_message);

	if (nolock_reason)
	{
		g_debug("Locking disabled: %s", nolock_reason);
	}

	if (uid_message && verbose)
	{
		g_print("Modified UID: %s", uid_message);
	}

	g_free(nolock_reason);
	g_free(orig_uid);
	g_free(uid_message);

	gs_profile_end(NULL);

	return ret;
}


/*
 * Copyright (c) 1991-2004 Jamie Zawinski <jwz@jwz.org>
 * Copyright (c) 2005 William Jon McCann <mccann@jhu.edu>
 *
 * Figure out what locking mechanisms are supported.
 */
static gboolean lock_initialization (int* argc, char** argv, char** nolock_reason, gboolean verbose)
{
	if (nolock_reason != NULL)
	{
		*nolock_reason = NULL;
	}

	#ifdef NO_LOCKING

		if (nolock_reason != NULL)
		{
			*nolock_reason = g_strdup("not compiled with locking support");
		}

		return FALSE;
	#else /* !NO_LOCKING */

		/* Finish initializing locking, now that we're out of privileged code. */
		if (!gs_auth_init())
		{
			if (nolock_reason != NULL)
			{
				*nolock_reason = g_strdup("error getting password");
			}

			return FALSE;
		}

		/* If locking is currently enabled, but the environment indicates that
		 * we have been launched as MDM's "Background" program, then disable
		 * locking just in case.
		 */
		if (getenv("RUNNING_UNDER_MDM"))
		{
			if (nolock_reason != NULL)
			{
				*nolock_reason = g_strdup("running under MDM");
			}

			return FALSE;
		}

		/* If the server is XDarwin (MacOS X) then disable locking.
		 * (X grabs only affect X programs, so you can use Command-Tab
		 * to bring any other Mac program to the front, e.g., Terminal.)
		 */
		{
			gboolean macos = FALSE;

			#ifdef __APPLE__
				/* Disable locking if *running* on Apple hardware, since we have no
				 * reliable way to determine whether the server is running on MacOS.
				 * Hopefully __APPLE__ means "MacOS" and not "Linux on Mac hardware"
				 * but I'm not really sure about that.
				 */
				macos = TRUE;
			#endif /* __APPLE__ */

			if (macos)
			{
				if (nolock_reason != NULL)
				{
					*nolock_reason = g_strdup("Cannot lock securely on MacOS X");
				}

				return FALSE;
			}
		}

	#endif /* NO_LOCKING */

	return TRUE;
}

int main(int argc, char** argv)
{
	GError* error = NULL;
	char* nolock_reason = NULL;

	#ifdef ENABLE_NLS
		bindtextdomain(GETTEXT_PACKAGE, MATELOCALEDIR);
		#ifdef HAVE_BIND_TEXTDOMAIN_CODESET
			bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");
		#endif
		textdomain(GETTEXT_PACKAGE);
	#endif

	gs_profile_start(NULL);

	if (!privileged_initialization(&argc, argv, verbose))
	{
		response_lock_init_failed();
		exit(1);
	}

	error = NULL;

	if (!gtk_init_with_args(&argc, &argv, NULL, entries, NULL, &error))
	{
		if (error != NULL)
		{
			fprintf(stderr, "%s", error->message);
			g_error_free(error);
		}

		exit(1);
	}

	if (show_version)
	{
		g_print("%s %s\n", argv[0], VERSION);
		exit(1);
	}

	if (!lock_initialization(&argc, argv, &nolock_reason, verbose))
	{
		if (nolock_reason != NULL)
		{
			g_debug ("Screen locking disabled: %s", nolock_reason);
			g_free (nolock_reason);
		}

		response_lock_init_failed();
		exit (1);
	}

	gs_debug_init(verbose, FALSE);

	g_idle_add (popup_dialog_idle, NULL);

	gtk_main();

	gs_profile_end(NULL);
	gs_debug_shutdown();

	return 0;
}