summaryrefslogtreecommitdiffstats
path: root/src/preflight.c
blob: f83c8b6e2fb27a388a1fec1700222dfbd79b2eaf (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
/*
 * preflight.c
 *
 * Copyright (C) 2013 Nikias Bassen <nikias@gmx.li>
 *
 * 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 or version 3.
 *
 * 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 Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include <sys/time.h>

#ifdef HAVE_LIBIMOBILEDEVICE
#include <libimobiledevice/libimobiledevice.h>
#include <libimobiledevice/lockdown.h>
#include <libimobiledevice/notification_proxy.h>
#endif

#include "preflight.h"
#include "device.h"
#include "client.h"
#include "conf.h"
#include "log.h"

#include "common/thread.h"

#ifdef HAVE_LIBIMOBILEDEVICE
enum connection_type {
	CONNECTION_USBMUXD = 1
};

struct idevice_private {
	char *udid;
	enum connection_type conn_type;
	void *conn_data;
};

struct cb_data {
	idevice_t dev;
	np_client_t np;
	int is_device_connected;
};

static void lockdownd_set_untrusted_host_buid(lockdownd_client_t lockdown)
{
	char* system_buid = NULL;
	config_get_system_buid(&system_buid);
	usbmuxd_log(LL_DEBUG, "%s: Setting UntrustedHostBUID to %s", __func__, system_buid);
	lockdownd_set_value(lockdown, NULL, "UntrustedHostBUID", plist_new_string(system_buid));
	free(system_buid);
}

void preflight_device_remove_cb(void *data)
{
	if (!data)
		return;
	struct cb_data *cbdata = (struct cb_data*)data;
	cbdata->is_device_connected = 0;
}

static void np_callback(const char* notification, void* userdata)
{
	struct cb_data *cbdata = (struct cb_data*)userdata;
	idevice_t dev = cbdata->dev;
	struct idevice_private *_dev = (struct idevice_private*)dev;

	lockdownd_client_t lockdown = NULL;
	lockdownd_error_t lerr;

	if (strlen(notification) == 0) {
		cbdata->np = NULL;
		return;
	}

	if (strcmp(notification, "com.apple.mobile.lockdown.request_pair") == 0) {
		usbmuxd_log(LL_INFO, "%s: user trusted this computer on device %s, pairing now", __func__, _dev->udid);
		lerr = lockdownd_client_new(dev, &lockdown, "usbmuxd");
		if (lerr != LOCKDOWN_E_SUCCESS) {
			usbmuxd_log(LL_ERROR, "%s: ERROR: Could not connect to lockdownd on device %s, lockdown error %d", __func__, _dev->udid, lerr);
			return;
		}

		lerr = lockdownd_pair(lockdown, NULL);
		if (lerr != LOCKDOWN_E_SUCCESS) {
			usbmuxd_log(LL_ERROR, "%s: ERROR: Pair failed for device %s, lockdown error %d", __func__, _dev->udid, lerr);
			lockdownd_client_free(lockdown);
			return;
		}
		lockdownd_client_free(lockdown);
		// device will reconnect by itself at this point.

	} else if (strcmp(notification, "com.apple.mobile.lockdown.request_host_buid") == 0) {
		lerr = lockdownd_client_new(cbdata->dev, &lockdown, "usbmuxd");
		if (lerr != LOCKDOWN_E_SUCCESS) {
			usbmuxd_log(LL_ERROR, "%s: ERROR: Could not connect to lockdownd on device %s, lockdown error %d", __func__, _dev->udid, lerr);
		} else {
			lockdownd_set_untrusted_host_buid(lockdown);
			lockdownd_client_free(lockdown);
		}
	}
}

static void* preflight_worker_handle_device_add(void* userdata)
{
	struct device_info *info = (struct device_info*)userdata;
	struct idevice_private *_dev = (struct idevice_private*)malloc(sizeof(struct idevice_private));
	_dev->udid = strdup(info->serial);
	_dev->conn_type = CONNECTION_USBMUXD;
	_dev->conn_data = (void*)(long)info->id;

	idevice_t dev = (idevice_t)_dev;

	lockdownd_client_t lockdown = NULL;
	lockdownd_error_t lerr;

	plist_t value = NULL;
	char* version_str = NULL;

	usbmuxd_log(LL_INFO, "%s: Starting preflight on device %s...", __func__, _dev->udid);

retry:
	lerr = lockdownd_client_new(dev, &lockdown, "usbmuxd");
	if (lerr != LOCKDOWN_E_SUCCESS) {
		usbmuxd_log(LL_ERROR, "%s: ERROR: Could not connect to lockdownd on device %s, lockdown error %d", __func__, _dev->udid, lerr);
		goto leave;
	}

	char *type = NULL;
	lerr = lockdownd_query_type(lockdown, &type);
	if (!type) {
		usbmuxd_log(LL_ERROR, "%s: ERROR: Could not get lockdownd type from device %s, lockdown error %d", __func__, _dev->udid, lerr);
		goto leave;
	}

	if (strcmp(type, "com.apple.mobile.lockdown") != 0) {
		// make restore mode devices visible
		free(type);
		usbmuxd_log(LL_INFO, "%s: Finished preflight on device %s", __func__, _dev->udid);
		client_device_add(info);
		goto leave;
	}
	free(type);

	int is_device_paired = 0;
	char *host_id = NULL;
	if (config_has_device_record(dev->udid)) {
		config_device_record_get_host_id(dev->udid, &host_id);
		lerr = lockdownd_start_session(lockdown, host_id, NULL, NULL);
		if (host_id)
			free(host_id);
		if (lerr == LOCKDOWN_E_SUCCESS) {
			usbmuxd_log(LL_INFO, "%s: StartSession success for device %s", __func__, _dev->udid);
			usbmuxd_log(LL_INFO, "%s: Finished preflight on device %s", __func__, _dev->udid);
			client_device_add(info);
			goto leave;
		}

		usbmuxd_log(LL_INFO, "%s: StartSession failed on device %s, lockdown error %d", __func__, _dev->udid, lerr);
	} else {
		lerr = LOCKDOWN_E_INVALID_HOST_ID;
	}
	switch (lerr) {
	case LOCKDOWN_E_INVALID_HOST_ID:
		usbmuxd_log(LL_INFO, "%s: Device %s is not paired with this host.", __func__, _dev->udid);
		break;
	case LOCKDOWN_E_SSL_ERROR:
		usbmuxd_log(LL_ERROR, "%s: The stored pair record for device %s is invalid. Removing.", __func__, _dev->udid);
		if (config_remove_device_record(_dev->udid) == 0) {
			lockdownd_client_free(lockdown);
			lockdown = NULL;
			goto retry;
		} else {
			usbmuxd_log(LL_ERROR, "%s: Could not remove pair record for device %s", __func__, _dev->udid);
		}
		break;
	default:
		is_device_paired = 1;
		break;
	}

	lerr = lockdownd_get_value(lockdown, NULL, "ProductVersion", &value);
	if (lerr != LOCKDOWN_E_SUCCESS) {
		usbmuxd_log(LL_ERROR, "%s: ERROR: Could not get ProductVersion from device %s, lockdown error %d", __func__, _dev->udid, lerr);
		goto leave;
	}

	if (value && plist_get_node_type(value) == PLIST_STRING) {
		plist_get_string_val(value, &version_str);
	}

	if (!version_str) {
		usbmuxd_log(LL_ERROR, "%s: Could not get ProductVersion string from device %s handle %d", __func__, _dev->udid, (int)(long)_dev->conn_data);
		goto leave;
	}

	int version_major = strtol(version_str, NULL, 10);
	if (version_major >= 7) {
		/* iOS 7.0 and later */
		usbmuxd_log(LL_INFO, "%s: Found ProductVersion %s device %s", __func__, version_str, _dev->udid);

		lockdownd_set_untrusted_host_buid(lockdown);

		/* if not paired, trigger the trust dialog to make sure it appears */
		if (!is_device_paired) {
			if (lockdownd_pair(lockdown, NULL) == LOCKDOWN_E_SUCCESS) {
				/* if device is still showing the setup screen it will pair even without trust dialog */
				usbmuxd_log(LL_INFO, "%s: Pair success for device %s", __func__, _dev->udid);
				usbmuxd_log(LL_INFO, "%s: Finished preflight on device %s", __func__, _dev->udid);
				client_device_add(info);
				goto leave;
			}
		}

		lockdownd_service_descriptor_t service = NULL;
		lerr = lockdownd_start_service(lockdown, "com.apple.mobile.insecure_notification_proxy", &service);
		if (lerr != LOCKDOWN_E_SUCCESS) {
			usbmuxd_log(LL_ERROR, "%s: ERROR: Could not start insecure_notification_proxy on %s, lockdown error %d", __func__, _dev->udid, lerr);
			goto leave;
		}

		np_client_t np = NULL;
		np_client_new(dev, service, &np);

		lockdownd_service_descriptor_free(service);
		service = NULL;

		lockdownd_client_free(lockdown);
		lockdown = NULL;

		struct cb_data cbdata;
		cbdata.dev = dev;
		cbdata.np = np;
		cbdata.is_device_connected = 1;

		np_set_notify_callback(np, np_callback, (void*)&cbdata);
		device_set_preflight_cb_data(info->id, (void*)&cbdata);

		const char* spec[] = {
			"com.apple.mobile.lockdown.request_pair",
			"com.apple.mobile.lockdown.request_host_buid",
			NULL
		}; 
		np_observe_notifications(np, spec);

		/* TODO send notification to user's desktop */

		usbmuxd_log(LL_INFO, "%s: Waiting for user to trust this computer on device %s", __func__, _dev->udid);

		/* make device visible anyways */
		client_device_add(info);

		while (cbdata.np && cbdata.is_device_connected == 1) {
			sleep(1);
		}
		device_set_preflight_cb_data(info->id, NULL);

		usbmuxd_log(LL_INFO, "%s: Finished waiting for notification from device %s, is_device_connected %d", __func__, _dev->udid, cbdata.is_device_connected);

		if (cbdata.np) {
			np_client_free(cbdata.np);
		}
	} else {
		/* iOS 6.x and earlier */
		lerr = lockdownd_pair(lockdown, NULL);
		if (lerr != LOCKDOWN_E_SUCCESS) {
			if (lerr == LOCKDOWN_E_PASSWORD_PROTECTED) {
				usbmuxd_log(LL_INFO, "%s: Device %s is locked with a passcode. Cannot pair.", __func__, _dev->udid);
				/* TODO send notification to user's desktop */
			} else {
				usbmuxd_log(LL_ERROR, "%s: ERROR: Pair failed for device %s, lockdown error %d", __func__, _dev->udid, lerr);
			}

			usbmuxd_log(LL_INFO, "%s: Finished preflight on device %s", __func__, _dev->udid);

			/* make device visible anyways */
			client_device_add(info);

			goto leave;
		}

		host_id = NULL;
		config_device_record_get_host_id(dev->udid, &host_id);
		lerr = lockdownd_start_session(lockdown, host_id, NULL, NULL);
		free(host_id);
		if (lerr != LOCKDOWN_E_SUCCESS) {
			usbmuxd_log(LL_ERROR, "%s: ERROR StartSession failed on device %s, lockdown error %d", __func__, _dev->udid, lerr);
			goto leave;
		}

		lerr = lockdownd_validate_pair(lockdown, NULL);
		if (lerr != LOCKDOWN_E_SUCCESS) {
			usbmuxd_log(LL_ERROR, "%s: ERROR: ValidatePair failed for device %s, lockdown error %d", __func__, _dev->udid, lerr);
			goto leave;
		}

		usbmuxd_log(LL_INFO, "%s: Finished preflight on device %s", __func__, _dev->udid);

		/* emit device added event and thus make device visible to clients */
		client_device_add(info);
	}

leave:
	if (value)
		plist_free(value);
	if (version_str)
		free(version_str);
	if (lockdown)
		lockdownd_client_free(lockdown);
	if (dev)
		idevice_free(dev);

	free(info);

	return NULL;
}
#else
void preflight_device_remove_cb(void *data)
{
}
#endif

void preflight_worker_device_add(struct device_info* info)
{
#ifdef HAVE_LIBIMOBILEDEVICE
	struct device_info *infocopy = (struct device_info*)malloc(sizeof(struct device_info));

	memcpy(infocopy, info, sizeof(struct device_info));

	thread_t th;
	int perr = thread_create(&th, preflight_worker_handle_device_add, infocopy);
	if (perr != 0) {
		free(infocopy);
		usbmuxd_log(LL_ERROR, "ERROR: failed to start preflight worker thread for device %s: %s (%d). Invoking client_device_add() directly but things might not work as expected.", info->serial, strerror(perr), perr);
		client_device_add(info);
	}
	thread_detach(th);
#else
	client_device_add(info);
#endif
}