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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
d59db761 IPG |
2 | /* |
3 | * Wireless USB Host Controller | |
4 | * Security support: encryption enablement, etc | |
5 | * | |
6 | * Copyright (C) 2006 Intel Corporation | |
7 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License version | |
11 | * 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
21 | * 02110-1301, USA. | |
22 | * | |
23 | * | |
24 | * FIXME: docs | |
25 | */ | |
26 | #include <linux/types.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
d59db761 IPG |
28 | #include <linux/usb/ch9.h> |
29 | #include <linux/random.h> | |
f940fcd8 | 30 | #include <linux/export.h> |
d59db761 | 31 | #include "wusbhc.h" |
b6565a07 | 32 | #include <asm/unaligned.h> |
d59db761 | 33 | |
471e42ad | 34 | static void wusbhc_gtk_rekey_work(struct work_struct *work); |
d59db761 IPG |
35 | |
36 | int wusbhc_sec_create(struct wusbhc *wusbhc) | |
37 | { | |
275e517c TP |
38 | /* |
39 | * WQ is singlethread because we need to serialize rekey operations. | |
40 | * Use a separate workqueue for security operations instead of the | |
41 | * wusbd workqueue because security operations may need to communicate | |
42 | * directly with downstream wireless devices using synchronous URBs. | |
43 | * If a device is not responding, this could block other host | |
44 | * controller operations. | |
45 | */ | |
46 | wusbhc->wq_security = create_singlethread_workqueue("wusbd_security"); | |
47 | if (wusbhc->wq_security == NULL) { | |
48 | pr_err("WUSB-core: Cannot create wusbd_security workqueue\n"); | |
49 | return -ENOMEM; | |
50 | } | |
51 | ||
521aea08 RB |
52 | wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) + |
53 | sizeof(wusbhc->gtk.data); | |
d59db761 IPG |
54 | wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY; |
55 | wusbhc->gtk.descr.bReserved = 0; | |
471e42ad | 56 | wusbhc->gtk_index = 0; |
d59db761 | 57 | |
471e42ad | 58 | INIT_WORK(&wusbhc->gtk_rekey_work, wusbhc_gtk_rekey_work); |
d59db761 IPG |
59 | |
60 | return 0; | |
61 | } | |
62 | ||
63 | ||
64 | /* Called when the HC is destroyed */ | |
65 | void wusbhc_sec_destroy(struct wusbhc *wusbhc) | |
66 | { | |
275e517c | 67 | destroy_workqueue(wusbhc->wq_security); |
d59db761 IPG |
68 | } |
69 | ||
70 | ||
71 | /** | |
72 | * wusbhc_next_tkid - generate a new, currently unused, TKID | |
73 | * @wusbhc: the WUSB host controller | |
74 | * @wusb_dev: the device whose PTK the TKID is for | |
75 | * (or NULL for a TKID for a GTK) | |
76 | * | |
1076e7a4 | 77 | * The generated TKID consists of two parts: the device's authenticated |
d59db761 IPG |
78 | * address (or 0 or a GTK); and an incrementing number. This ensures |
79 | * that TKIDs cannot be shared between devices and by the time the | |
80 | * incrementing number wraps around the older TKIDs will no longer be | |
81 | * in use (a maximum of two keys may be active at any one time). | |
82 | */ | |
83 | static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
84 | { | |
85 | u32 *tkid; | |
86 | u32 addr; | |
87 | ||
88 | if (wusb_dev == NULL) { | |
89 | tkid = &wusbhc->gtk_tkid; | |
90 | addr = 0; | |
91 | } else { | |
92 | tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid; | |
93 | addr = wusb_dev->addr & 0x7f; | |
94 | } | |
95 | ||
96 | *tkid = (addr << 8) | ((*tkid + 1) & 0xff); | |
97 | ||
98 | return *tkid; | |
99 | } | |
100 | ||
101 | static void wusbhc_generate_gtk(struct wusbhc *wusbhc) | |
102 | { | |
103 | const size_t key_size = sizeof(wusbhc->gtk.data); | |
104 | u32 tkid; | |
105 | ||
106 | tkid = wusbhc_next_tkid(wusbhc, NULL); | |
107 | ||
108 | wusbhc->gtk.descr.tTKID[0] = (tkid >> 0) & 0xff; | |
109 | wusbhc->gtk.descr.tTKID[1] = (tkid >> 8) & 0xff; | |
110 | wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff; | |
111 | ||
112 | get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size); | |
113 | } | |
114 | ||
115 | /** | |
116 | * wusbhc_sec_start - start the security management process | |
117 | * @wusbhc: the WUSB host controller | |
118 | * | |
119 | * Generate and set an initial GTK on the host controller. | |
120 | * | |
121 | * Called when the HC is started. | |
122 | */ | |
123 | int wusbhc_sec_start(struct wusbhc *wusbhc) | |
124 | { | |
125 | const size_t key_size = sizeof(wusbhc->gtk.data); | |
126 | int result; | |
127 | ||
128 | wusbhc_generate_gtk(wusbhc); | |
129 | ||
130 | result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, | |
471e42ad | 131 | &wusbhc->gtk.descr.bKeyData, key_size); |
d59db761 IPG |
132 | if (result < 0) |
133 | dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n", | |
134 | result); | |
135 | ||
136 | return result; | |
137 | } | |
138 | ||
139 | /** | |
140 | * wusbhc_sec_stop - stop the security management process | |
141 | * @wusbhc: the WUSB host controller | |
142 | * | |
143 | * Wait for any pending GTK rekeys to stop. | |
144 | */ | |
145 | void wusbhc_sec_stop(struct wusbhc *wusbhc) | |
146 | { | |
471e42ad | 147 | cancel_work_sync(&wusbhc->gtk_rekey_work); |
d59db761 IPG |
148 | } |
149 | ||
150 | ||
151 | /** @returns encryption type name */ | |
152 | const char *wusb_et_name(u8 x) | |
153 | { | |
154 | switch (x) { | |
155 | case USB_ENC_TYPE_UNSECURE: return "unsecure"; | |
156 | case USB_ENC_TYPE_WIRED: return "wired"; | |
157 | case USB_ENC_TYPE_CCM_1: return "CCM-1"; | |
158 | case USB_ENC_TYPE_RSA_1: return "RSA-1"; | |
521aea08 | 159 | default: return "unknown"; |
d59db761 IPG |
160 | } |
161 | } | |
162 | EXPORT_SYMBOL_GPL(wusb_et_name); | |
163 | ||
164 | /* | |
165 | * Set the device encryption method | |
166 | * | |
167 | * We tell the device which encryption method to use; we do this when | |
168 | * setting up the device's security. | |
169 | */ | |
170 | static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value) | |
171 | { | |
172 | int result; | |
173 | struct device *dev = &usb_dev->dev; | |
174 | struct wusb_dev *wusb_dev = usb_dev->wusb_dev; | |
175 | ||
176 | if (value) { | |
177 | value = wusb_dev->ccm1_etd.bEncryptionValue; | |
178 | } else { | |
179 | /* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */ | |
180 | value = 0; | |
181 | } | |
182 | /* Set device's */ | |
183 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
184 | USB_REQ_SET_ENCRYPTION, | |
185 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 186 | value, 0, NULL, 0, USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
187 | if (result < 0) |
188 | dev_err(dev, "Can't set device's WUSB encryption to " | |
189 | "%s (value %d): %d\n", | |
190 | wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType), | |
191 | wusb_dev->ccm1_etd.bEncryptionValue, result); | |
192 | return result; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Set the GTK to be used by a device. | |
197 | * | |
198 | * The device must be authenticated. | |
199 | */ | |
200 | static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
201 | { | |
202 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
471e42ad TP |
203 | u8 key_index = wusb_key_index(wusbhc->gtk_index, |
204 | WUSB_KEY_INDEX_TYPE_GTK, WUSB_KEY_INDEX_ORIGINATOR_HOST); | |
d59db761 IPG |
205 | |
206 | return usb_control_msg( | |
207 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
208 | USB_REQ_SET_DESCRIPTOR, | |
209 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
471e42ad | 210 | USB_DT_KEY << 8 | key_index, 0, |
d59db761 | 211 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, |
7b3e3740 | 212 | USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
213 | } |
214 | ||
215 | ||
216 | /* FIXME: prototype for adding security */ | |
217 | int wusb_dev_sec_add(struct wusbhc *wusbhc, | |
218 | struct usb_device *usb_dev, struct wusb_dev *wusb_dev) | |
219 | { | |
220 | int result, bytes, secd_size; | |
221 | struct device *dev = &usb_dev->dev; | |
e58ba01e | 222 | struct usb_security_descriptor *secd, *new_secd; |
d59db761 | 223 | const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL; |
d59db761 IPG |
224 | const void *itr, *top; |
225 | char buf[64]; | |
226 | ||
9279095a | 227 | secd = kmalloc(sizeof(*secd), GFP_KERNEL); |
b41ecf9a SP |
228 | if (secd == NULL) { |
229 | result = -ENOMEM; | |
230 | goto out; | |
231 | } | |
232 | ||
d59db761 | 233 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
9279095a DV |
234 | 0, secd, sizeof(*secd)); |
235 | if (result < sizeof(*secd)) { | |
d59db761 IPG |
236 | dev_err(dev, "Can't read security descriptor or " |
237 | "not enough data: %d\n", result); | |
b41ecf9a | 238 | goto out; |
d59db761 | 239 | } |
b41ecf9a | 240 | secd_size = le16_to_cpu(secd->wTotalLength); |
e58ba01e AK |
241 | new_secd = krealloc(secd, secd_size, GFP_KERNEL); |
242 | if (new_secd == NULL) { | |
521aea08 RB |
243 | dev_err(dev, |
244 | "Can't allocate space for security descriptors\n"); | |
fca0ca95 | 245 | result = -ENOMEM; |
b41ecf9a | 246 | goto out; |
d59db761 | 247 | } |
e58ba01e | 248 | secd = new_secd; |
d59db761 | 249 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
b41ecf9a | 250 | 0, secd, secd_size); |
d59db761 IPG |
251 | if (result < secd_size) { |
252 | dev_err(dev, "Can't read security descriptor or " | |
253 | "not enough data: %d\n", result); | |
b41ecf9a | 254 | goto out; |
d59db761 | 255 | } |
d59db761 | 256 | bytes = 0; |
b41ecf9a SP |
257 | itr = &secd[1]; |
258 | top = (void *)secd + result; | |
d59db761 IPG |
259 | while (itr < top) { |
260 | etd = itr; | |
261 | if (top - itr < sizeof(*etd)) { | |
262 | dev_err(dev, "BUG: bad device security descriptor; " | |
263 | "not enough data (%zu vs %zu bytes left)\n", | |
264 | top - itr, sizeof(*etd)); | |
265 | break; | |
266 | } | |
267 | if (etd->bLength < sizeof(*etd)) { | |
268 | dev_err(dev, "BUG: bad device encryption descriptor; " | |
269 | "descriptor is too short " | |
270 | "(%u vs %zu needed)\n", | |
271 | etd->bLength, sizeof(*etd)); | |
272 | break; | |
273 | } | |
274 | itr += etd->bLength; | |
275 | bytes += snprintf(buf + bytes, sizeof(buf) - bytes, | |
276 | "%s (0x%02x/%02x) ", | |
277 | wusb_et_name(etd->bEncryptionType), | |
278 | etd->bEncryptionValue, etd->bAuthKeyIndex); | |
279 | if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1) | |
280 | ccm1_etd = etd; | |
281 | } | |
282 | /* This code only supports CCM1 as of now. */ | |
283 | /* FIXME: user has to choose which sec mode to use? | |
284 | * In theory we want CCM */ | |
285 | if (ccm1_etd == NULL) { | |
286 | dev_err(dev, "WUSB device doesn't support CCM1 encryption, " | |
287 | "can't use!\n"); | |
288 | result = -EINVAL; | |
b41ecf9a | 289 | goto out; |
d59db761 IPG |
290 | } |
291 | wusb_dev->ccm1_etd = *ccm1_etd; | |
bce83697 DV |
292 | dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n", |
293 | buf, wusb_et_name(ccm1_etd->bEncryptionType), | |
294 | ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex); | |
d59db761 | 295 | result = 0; |
d59db761 | 296 | out: |
b41ecf9a | 297 | kfree(secd); |
d59db761 | 298 | return result; |
d59db761 IPG |
299 | } |
300 | ||
301 | void wusb_dev_sec_rm(struct wusb_dev *wusb_dev) | |
302 | { | |
303 | /* Nothing so far */ | |
304 | } | |
305 | ||
d59db761 IPG |
306 | /** |
307 | * Update the address of an unauthenticated WUSB device | |
308 | * | |
309 | * Once we have successfully authenticated, we take it to addr0 state | |
310 | * and then to a normal address. | |
311 | * | |
312 | * Before the device's address (as known by it) was usb_dev->devnum | | |
313 | * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum. | |
314 | */ | |
4656d5de | 315 | int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) |
d59db761 IPG |
316 | { |
317 | int result = -ENOMEM; | |
318 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
319 | struct device *dev = &usb_dev->dev; | |
320 | u8 new_address = wusb_dev->addr & 0x7F; | |
321 | ||
322 | /* Set address 0 */ | |
323 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
7b3e3740 TP |
324 | USB_REQ_SET_ADDRESS, |
325 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
326 | 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
d59db761 IPG |
327 | if (result < 0) { |
328 | dev_err(dev, "auth failed: can't set address 0: %d\n", | |
329 | result); | |
330 | goto error_addr0; | |
331 | } | |
332 | result = wusb_set_dev_addr(wusbhc, wusb_dev, 0); | |
333 | if (result < 0) | |
334 | goto error_addr0; | |
6da9c990 | 335 | usb_set_device_state(usb_dev, USB_STATE_DEFAULT); |
d59db761 IPG |
336 | usb_ep0_reinit(usb_dev); |
337 | ||
338 | /* Set new (authenticated) address. */ | |
339 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
7b3e3740 TP |
340 | USB_REQ_SET_ADDRESS, |
341 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
342 | new_address, 0, NULL, 0, | |
343 | USB_CTRL_SET_TIMEOUT); | |
d59db761 IPG |
344 | if (result < 0) { |
345 | dev_err(dev, "auth failed: can't set address %u: %d\n", | |
346 | new_address, result); | |
347 | goto error_addr; | |
348 | } | |
349 | result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address); | |
350 | if (result < 0) | |
351 | goto error_addr; | |
6da9c990 | 352 | usb_set_device_state(usb_dev, USB_STATE_ADDRESS); |
d59db761 IPG |
353 | usb_ep0_reinit(usb_dev); |
354 | usb_dev->authenticated = 1; | |
355 | error_addr: | |
356 | error_addr0: | |
357 | return result; | |
358 | } | |
359 | ||
360 | /* | |
361 | * | |
362 | * | |
363 | */ | |
364 | /* FIXME: split and cleanup */ | |
365 | int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, | |
366 | struct wusb_ckhdid *ck) | |
367 | { | |
368 | int result = -ENOMEM; | |
369 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
370 | struct device *dev = &usb_dev->dev; | |
371 | u32 tkid; | |
d59db761 IPG |
372 | struct usb_handshake *hs; |
373 | struct aes_ccm_nonce ccm_n; | |
374 | u8 mic[8]; | |
375 | struct wusb_keydvt_in keydvt_in; | |
376 | struct wusb_keydvt_out keydvt_out; | |
377 | ||
d5ca9db8 | 378 | hs = kcalloc(3, sizeof(hs[0]), GFP_KERNEL); |
d919523f | 379 | if (!hs) |
d59db761 | 380 | goto error_kzalloc; |
d59db761 IPG |
381 | |
382 | /* We need to turn encryption before beginning the 4way | |
383 | * hshake (WUSB1.0[.3.2.2]) */ | |
384 | result = wusb_dev_set_encryption(usb_dev, 1); | |
385 | if (result < 0) | |
386 | goto error_dev_set_encryption; | |
387 | ||
388 | tkid = wusbhc_next_tkid(wusbhc, wusb_dev); | |
d59db761 IPG |
389 | |
390 | hs[0].bMessageNumber = 1; | |
391 | hs[0].bStatus = 0; | |
b6565a07 | 392 | put_unaligned_le32(tkid, hs[0].tTKID); |
d59db761 IPG |
393 | hs[0].bReserved = 0; |
394 | memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID)); | |
395 | get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce)); | |
521aea08 | 396 | memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */ |
d59db761 | 397 | |
d59db761 IPG |
398 | result = usb_control_msg( |
399 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
400 | USB_REQ_SET_HANDSHAKE, | |
401 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 402 | 1, 0, &hs[0], sizeof(hs[0]), USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
403 | if (result < 0) { |
404 | dev_err(dev, "Handshake1: request failed: %d\n", result); | |
405 | goto error_hs1; | |
406 | } | |
407 | ||
408 | /* Handshake 2, from the device -- need to verify fields */ | |
409 | result = usb_control_msg( | |
410 | usb_dev, usb_rcvctrlpipe(usb_dev, 0), | |
411 | USB_REQ_GET_HANDSHAKE, | |
412 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 413 | 2, 0, &hs[1], sizeof(hs[1]), USB_CTRL_GET_TIMEOUT); |
d59db761 IPG |
414 | if (result < 0) { |
415 | dev_err(dev, "Handshake2: request failed: %d\n", result); | |
416 | goto error_hs2; | |
417 | } | |
d59db761 IPG |
418 | |
419 | result = -EINVAL; | |
420 | if (hs[1].bMessageNumber != 2) { | |
421 | dev_err(dev, "Handshake2 failed: bad message number %u\n", | |
422 | hs[1].bMessageNumber); | |
423 | goto error_hs2; | |
424 | } | |
425 | if (hs[1].bStatus != 0) { | |
426 | dev_err(dev, "Handshake2 failed: bad status %u\n", | |
427 | hs[1].bStatus); | |
428 | goto error_hs2; | |
429 | } | |
430 | if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) { | |
431 | dev_err(dev, "Handshake2 failed: TKID mismatch " | |
432 | "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n", | |
433 | hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2], | |
434 | hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]); | |
435 | goto error_hs2; | |
436 | } | |
437 | if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) { | |
438 | dev_err(dev, "Handshake2 failed: CDID mismatch\n"); | |
439 | goto error_hs2; | |
440 | } | |
441 | ||
442 | /* Setup the CCM nonce */ | |
521aea08 | 443 | memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */ |
b6565a07 | 444 | put_unaligned_le32(tkid, ccm_n.tkid); |
d59db761 IPG |
445 | ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr; |
446 | ccm_n.dest_addr.data[0] = wusb_dev->addr; | |
447 | ccm_n.dest_addr.data[1] = 0; | |
448 | ||
449 | /* Derive the KCK and PTK from CK, the CCM, H and D nonces */ | |
450 | memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce)); | |
451 | memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce)); | |
452 | result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in); | |
453 | if (result < 0) { | |
454 | dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n", | |
455 | result); | |
456 | goto error_hs2; | |
457 | } | |
d59db761 IPG |
458 | |
459 | /* Compute MIC and verify it */ | |
460 | result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]); | |
461 | if (result < 0) { | |
462 | dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n", | |
463 | result); | |
464 | goto error_hs2; | |
465 | } | |
466 | ||
d59db761 IPG |
467 | if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) { |
468 | dev_err(dev, "Handshake2 failed: MIC mismatch\n"); | |
469 | goto error_hs2; | |
470 | } | |
471 | ||
472 | /* Send Handshake3 */ | |
473 | hs[2].bMessageNumber = 3; | |
474 | hs[2].bStatus = 0; | |
b6565a07 | 475 | put_unaligned_le32(tkid, hs[2].tTKID); |
d59db761 IPG |
476 | hs[2].bReserved = 0; |
477 | memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID)); | |
478 | memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce)); | |
479 | result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]); | |
480 | if (result < 0) { | |
481 | dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n", | |
482 | result); | |
483 | goto error_hs2; | |
484 | } | |
485 | ||
d59db761 IPG |
486 | result = usb_control_msg( |
487 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
488 | USB_REQ_SET_HANDSHAKE, | |
489 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 490 | 3, 0, &hs[2], sizeof(hs[2]), USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
491 | if (result < 0) { |
492 | dev_err(dev, "Handshake3: request failed: %d\n", result); | |
493 | goto error_hs3; | |
494 | } | |
495 | ||
d59db761 IPG |
496 | result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid, |
497 | keydvt_out.ptk, sizeof(keydvt_out.ptk)); | |
498 | if (result < 0) | |
499 | goto error_wusbhc_set_ptk; | |
500 | ||
d59db761 IPG |
501 | result = wusb_dev_set_gtk(wusbhc, wusb_dev); |
502 | if (result < 0) { | |
503 | dev_err(dev, "Set GTK for device: request failed: %d\n", | |
504 | result); | |
505 | goto error_wusbhc_set_gtk; | |
506 | } | |
507 | ||
508 | /* Update the device's address from unauth to auth */ | |
509 | if (usb_dev->authenticated == 0) { | |
d59db761 IPG |
510 | result = wusb_dev_update_address(wusbhc, wusb_dev); |
511 | if (result < 0) | |
512 | goto error_dev_update_address; | |
513 | } | |
514 | result = 0; | |
bce83697 | 515 | dev_info(dev, "device authenticated\n"); |
d59db761 IPG |
516 | |
517 | error_dev_update_address: | |
518 | error_wusbhc_set_gtk: | |
519 | error_wusbhc_set_ptk: | |
520 | error_hs3: | |
521 | error_hs2: | |
522 | error_hs1: | |
523 | memset(hs, 0, 3*sizeof(hs[0])); | |
eb94ec7a JL |
524 | memzero_explicit(&keydvt_out, sizeof(keydvt_out)); |
525 | memzero_explicit(&keydvt_in, sizeof(keydvt_in)); | |
526 | memzero_explicit(&ccm_n, sizeof(ccm_n)); | |
527 | memzero_explicit(mic, sizeof(mic)); | |
bce83697 | 528 | if (result < 0) |
d59db761 | 529 | wusb_dev_set_encryption(usb_dev, 0); |
d59db761 IPG |
530 | error_dev_set_encryption: |
531 | kfree(hs); | |
532 | error_kzalloc: | |
533 | return result; | |
534 | } | |
535 | ||
536 | /* | |
537 | * Once all connected and authenticated devices have received the new | |
538 | * GTK, switch the host to using it. | |
539 | */ | |
471e42ad | 540 | static void wusbhc_gtk_rekey_work(struct work_struct *work) |
d59db761 | 541 | { |
471e42ad TP |
542 | struct wusbhc *wusbhc = container_of(work, |
543 | struct wusbhc, gtk_rekey_work); | |
d59db761 | 544 | size_t key_size = sizeof(wusbhc->gtk.data); |
471e42ad TP |
545 | int port_idx; |
546 | struct wusb_dev *wusb_dev, *wusb_dev_next; | |
547 | LIST_HEAD(rekey_list); | |
d59db761 IPG |
548 | |
549 | mutex_lock(&wusbhc->mutex); | |
471e42ad TP |
550 | /* generate the new key */ |
551 | wusbhc_generate_gtk(wusbhc); | |
552 | /* roll the gtk index. */ | |
553 | wusbhc->gtk_index = (wusbhc->gtk_index + 1) % (WUSB_KEY_INDEX_MAX + 1); | |
554 | /* | |
555 | * Save all connected devices on a list while holding wusbhc->mutex and | |
556 | * take a reference to each one. Then submit the set key request to | |
557 | * them after releasing the lock in order to avoid a deadlock. | |
558 | */ | |
559 | for (port_idx = 0; port_idx < wusbhc->ports_max; port_idx++) { | |
560 | wusb_dev = wusbhc->port[port_idx].wusb_dev; | |
561 | if (!wusb_dev || !wusb_dev->usb_dev | |
562 | || !wusb_dev->usb_dev->authenticated) | |
563 | continue; | |
d59db761 | 564 | |
471e42ad TP |
565 | wusb_dev_get(wusb_dev); |
566 | list_add_tail(&wusb_dev->rekey_node, &rekey_list); | |
567 | } | |
d59db761 | 568 | mutex_unlock(&wusbhc->mutex); |
d59db761 | 569 | |
471e42ad TP |
570 | /* Submit the rekey requests without holding wusbhc->mutex. */ |
571 | list_for_each_entry_safe(wusb_dev, wusb_dev_next, &rekey_list, | |
572 | rekey_node) { | |
573 | list_del_init(&wusb_dev->rekey_node); | |
521aea08 RB |
574 | dev_dbg(&wusb_dev->usb_dev->dev, |
575 | "%s: rekey device at port %d\n", | |
471e42ad TP |
576 | __func__, wusb_dev->port_idx); |
577 | ||
578 | if (wusb_dev_set_gtk(wusbhc, wusb_dev) < 0) { | |
521aea08 RB |
579 | dev_err(&wusb_dev->usb_dev->dev, |
580 | "%s: rekey device at port %d failed\n", | |
471e42ad TP |
581 | __func__, wusb_dev->port_idx); |
582 | } | |
583 | wusb_dev_put(wusb_dev); | |
584 | } | |
d59db761 | 585 | |
471e42ad TP |
586 | /* Switch the host controller to use the new GTK. */ |
587 | mutex_lock(&wusbhc->mutex); | |
588 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, | |
589 | &wusbhc->gtk.descr.bKeyData, key_size); | |
590 | mutex_unlock(&wusbhc->mutex); | |
d59db761 IPG |
591 | } |
592 | ||
593 | /** | |
594 | * wusbhc_gtk_rekey - generate and distribute a new GTK | |
595 | * @wusbhc: the WUSB host controller | |
596 | * | |
597 | * Generate a new GTK and distribute it to all connected and | |
598 | * authenticated devices. When all devices have the new GTK, the host | |
599 | * starts using it. | |
600 | * | |
601 | * This must be called after every device disconnect (see [WUSB] | |
602 | * section 6.2.11.2). | |
603 | */ | |
604 | void wusbhc_gtk_rekey(struct wusbhc *wusbhc) | |
605 | { | |
471e42ad TP |
606 | /* |
607 | * We need to submit a URB to the downstream WUSB devices in order to | |
608 | * change the group key. This can't be done while holding the | |
609 | * wusbhc->mutex since that is also taken in the urb_enqueue routine | |
610 | * and will cause a deadlock. Instead, queue a work item to do | |
611 | * it when the lock is not held | |
612 | */ | |
275e517c | 613 | queue_work(wusbhc->wq_security, &wusbhc->gtk_rekey_work); |
d59db761 | 614 | } |