Commit | Line | Data |
---|---|---|
d59db761 IPG |
1 | /* |
2 | * Wireless USB Host Controller | |
3 | * Security support: encryption enablement, etc | |
4 | * | |
5 | * Copyright (C) 2006 Intel Corporation | |
6 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version | |
10 | * 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
20 | * 02110-1301, USA. | |
21 | * | |
22 | * | |
23 | * FIXME: docs | |
24 | */ | |
25 | #include <linux/types.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
d59db761 IPG |
27 | #include <linux/usb/ch9.h> |
28 | #include <linux/random.h> | |
f940fcd8 | 29 | #include <linux/export.h> |
d59db761 IPG |
30 | #include "wusbhc.h" |
31 | ||
471e42ad | 32 | static void wusbhc_gtk_rekey_work(struct work_struct *work); |
d59db761 IPG |
33 | |
34 | int wusbhc_sec_create(struct wusbhc *wusbhc) | |
35 | { | |
275e517c TP |
36 | /* |
37 | * WQ is singlethread because we need to serialize rekey operations. | |
38 | * Use a separate workqueue for security operations instead of the | |
39 | * wusbd workqueue because security operations may need to communicate | |
40 | * directly with downstream wireless devices using synchronous URBs. | |
41 | * If a device is not responding, this could block other host | |
42 | * controller operations. | |
43 | */ | |
44 | wusbhc->wq_security = create_singlethread_workqueue("wusbd_security"); | |
45 | if (wusbhc->wq_security == NULL) { | |
46 | pr_err("WUSB-core: Cannot create wusbd_security workqueue\n"); | |
47 | return -ENOMEM; | |
48 | } | |
49 | ||
521aea08 RB |
50 | wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) + |
51 | sizeof(wusbhc->gtk.data); | |
d59db761 IPG |
52 | wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY; |
53 | wusbhc->gtk.descr.bReserved = 0; | |
471e42ad | 54 | wusbhc->gtk_index = 0; |
d59db761 | 55 | |
471e42ad | 56 | INIT_WORK(&wusbhc->gtk_rekey_work, wusbhc_gtk_rekey_work); |
d59db761 IPG |
57 | |
58 | return 0; | |
59 | } | |
60 | ||
61 | ||
62 | /* Called when the HC is destroyed */ | |
63 | void wusbhc_sec_destroy(struct wusbhc *wusbhc) | |
64 | { | |
275e517c | 65 | destroy_workqueue(wusbhc->wq_security); |
d59db761 IPG |
66 | } |
67 | ||
68 | ||
69 | /** | |
70 | * wusbhc_next_tkid - generate a new, currently unused, TKID | |
71 | * @wusbhc: the WUSB host controller | |
72 | * @wusb_dev: the device whose PTK the TKID is for | |
73 | * (or NULL for a TKID for a GTK) | |
74 | * | |
1076e7a4 | 75 | * The generated TKID consists of two parts: the device's authenticated |
d59db761 IPG |
76 | * address (or 0 or a GTK); and an incrementing number. This ensures |
77 | * that TKIDs cannot be shared between devices and by the time the | |
78 | * incrementing number wraps around the older TKIDs will no longer be | |
79 | * in use (a maximum of two keys may be active at any one time). | |
80 | */ | |
81 | static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
82 | { | |
83 | u32 *tkid; | |
84 | u32 addr; | |
85 | ||
86 | if (wusb_dev == NULL) { | |
87 | tkid = &wusbhc->gtk_tkid; | |
88 | addr = 0; | |
89 | } else { | |
90 | tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid; | |
91 | addr = wusb_dev->addr & 0x7f; | |
92 | } | |
93 | ||
94 | *tkid = (addr << 8) | ((*tkid + 1) & 0xff); | |
95 | ||
96 | return *tkid; | |
97 | } | |
98 | ||
99 | static void wusbhc_generate_gtk(struct wusbhc *wusbhc) | |
100 | { | |
101 | const size_t key_size = sizeof(wusbhc->gtk.data); | |
102 | u32 tkid; | |
103 | ||
104 | tkid = wusbhc_next_tkid(wusbhc, NULL); | |
105 | ||
106 | wusbhc->gtk.descr.tTKID[0] = (tkid >> 0) & 0xff; | |
107 | wusbhc->gtk.descr.tTKID[1] = (tkid >> 8) & 0xff; | |
108 | wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff; | |
109 | ||
110 | get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size); | |
111 | } | |
112 | ||
113 | /** | |
114 | * wusbhc_sec_start - start the security management process | |
115 | * @wusbhc: the WUSB host controller | |
116 | * | |
117 | * Generate and set an initial GTK on the host controller. | |
118 | * | |
119 | * Called when the HC is started. | |
120 | */ | |
121 | int wusbhc_sec_start(struct wusbhc *wusbhc) | |
122 | { | |
123 | const size_t key_size = sizeof(wusbhc->gtk.data); | |
124 | int result; | |
125 | ||
126 | wusbhc_generate_gtk(wusbhc); | |
127 | ||
128 | result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, | |
471e42ad | 129 | &wusbhc->gtk.descr.bKeyData, key_size); |
d59db761 IPG |
130 | if (result < 0) |
131 | dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n", | |
132 | result); | |
133 | ||
134 | return result; | |
135 | } | |
136 | ||
137 | /** | |
138 | * wusbhc_sec_stop - stop the security management process | |
139 | * @wusbhc: the WUSB host controller | |
140 | * | |
141 | * Wait for any pending GTK rekeys to stop. | |
142 | */ | |
143 | void wusbhc_sec_stop(struct wusbhc *wusbhc) | |
144 | { | |
471e42ad | 145 | cancel_work_sync(&wusbhc->gtk_rekey_work); |
d59db761 IPG |
146 | } |
147 | ||
148 | ||
149 | /** @returns encryption type name */ | |
150 | const char *wusb_et_name(u8 x) | |
151 | { | |
152 | switch (x) { | |
153 | case USB_ENC_TYPE_UNSECURE: return "unsecure"; | |
154 | case USB_ENC_TYPE_WIRED: return "wired"; | |
155 | case USB_ENC_TYPE_CCM_1: return "CCM-1"; | |
156 | case USB_ENC_TYPE_RSA_1: return "RSA-1"; | |
521aea08 | 157 | default: return "unknown"; |
d59db761 IPG |
158 | } |
159 | } | |
160 | EXPORT_SYMBOL_GPL(wusb_et_name); | |
161 | ||
162 | /* | |
163 | * Set the device encryption method | |
164 | * | |
165 | * We tell the device which encryption method to use; we do this when | |
166 | * setting up the device's security. | |
167 | */ | |
168 | static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value) | |
169 | { | |
170 | int result; | |
171 | struct device *dev = &usb_dev->dev; | |
172 | struct wusb_dev *wusb_dev = usb_dev->wusb_dev; | |
173 | ||
174 | if (value) { | |
175 | value = wusb_dev->ccm1_etd.bEncryptionValue; | |
176 | } else { | |
177 | /* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */ | |
178 | value = 0; | |
179 | } | |
180 | /* Set device's */ | |
181 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
182 | USB_REQ_SET_ENCRYPTION, | |
183 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 184 | value, 0, NULL, 0, USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
185 | if (result < 0) |
186 | dev_err(dev, "Can't set device's WUSB encryption to " | |
187 | "%s (value %d): %d\n", | |
188 | wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType), | |
189 | wusb_dev->ccm1_etd.bEncryptionValue, result); | |
190 | return result; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Set the GTK to be used by a device. | |
195 | * | |
196 | * The device must be authenticated. | |
197 | */ | |
198 | static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
199 | { | |
200 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
471e42ad TP |
201 | u8 key_index = wusb_key_index(wusbhc->gtk_index, |
202 | WUSB_KEY_INDEX_TYPE_GTK, WUSB_KEY_INDEX_ORIGINATOR_HOST); | |
d59db761 IPG |
203 | |
204 | return usb_control_msg( | |
205 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
206 | USB_REQ_SET_DESCRIPTOR, | |
207 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
471e42ad | 208 | USB_DT_KEY << 8 | key_index, 0, |
d59db761 | 209 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, |
7b3e3740 | 210 | USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
211 | } |
212 | ||
213 | ||
214 | /* FIXME: prototype for adding security */ | |
215 | int wusb_dev_sec_add(struct wusbhc *wusbhc, | |
216 | struct usb_device *usb_dev, struct wusb_dev *wusb_dev) | |
217 | { | |
218 | int result, bytes, secd_size; | |
219 | struct device *dev = &usb_dev->dev; | |
e58ba01e | 220 | struct usb_security_descriptor *secd, *new_secd; |
d59db761 | 221 | const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL; |
d59db761 IPG |
222 | const void *itr, *top; |
223 | char buf[64]; | |
224 | ||
9279095a | 225 | secd = kmalloc(sizeof(*secd), GFP_KERNEL); |
b41ecf9a SP |
226 | if (secd == NULL) { |
227 | result = -ENOMEM; | |
228 | goto out; | |
229 | } | |
230 | ||
d59db761 | 231 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
9279095a DV |
232 | 0, secd, sizeof(*secd)); |
233 | if (result < sizeof(*secd)) { | |
d59db761 IPG |
234 | dev_err(dev, "Can't read security descriptor or " |
235 | "not enough data: %d\n", result); | |
b41ecf9a | 236 | goto out; |
d59db761 | 237 | } |
b41ecf9a | 238 | secd_size = le16_to_cpu(secd->wTotalLength); |
e58ba01e AK |
239 | new_secd = krealloc(secd, secd_size, GFP_KERNEL); |
240 | if (new_secd == NULL) { | |
521aea08 RB |
241 | dev_err(dev, |
242 | "Can't allocate space for security descriptors\n"); | |
b41ecf9a | 243 | goto out; |
d59db761 | 244 | } |
e58ba01e | 245 | secd = new_secd; |
d59db761 | 246 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
b41ecf9a | 247 | 0, secd, secd_size); |
d59db761 IPG |
248 | if (result < secd_size) { |
249 | dev_err(dev, "Can't read security descriptor or " | |
250 | "not enough data: %d\n", result); | |
b41ecf9a | 251 | goto out; |
d59db761 | 252 | } |
d59db761 | 253 | bytes = 0; |
b41ecf9a SP |
254 | itr = &secd[1]; |
255 | top = (void *)secd + result; | |
d59db761 IPG |
256 | while (itr < top) { |
257 | etd = itr; | |
258 | if (top - itr < sizeof(*etd)) { | |
259 | dev_err(dev, "BUG: bad device security descriptor; " | |
260 | "not enough data (%zu vs %zu bytes left)\n", | |
261 | top - itr, sizeof(*etd)); | |
262 | break; | |
263 | } | |
264 | if (etd->bLength < sizeof(*etd)) { | |
265 | dev_err(dev, "BUG: bad device encryption descriptor; " | |
266 | "descriptor is too short " | |
267 | "(%u vs %zu needed)\n", | |
268 | etd->bLength, sizeof(*etd)); | |
269 | break; | |
270 | } | |
271 | itr += etd->bLength; | |
272 | bytes += snprintf(buf + bytes, sizeof(buf) - bytes, | |
273 | "%s (0x%02x/%02x) ", | |
274 | wusb_et_name(etd->bEncryptionType), | |
275 | etd->bEncryptionValue, etd->bAuthKeyIndex); | |
276 | if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1) | |
277 | ccm1_etd = etd; | |
278 | } | |
279 | /* This code only supports CCM1 as of now. */ | |
280 | /* FIXME: user has to choose which sec mode to use? | |
281 | * In theory we want CCM */ | |
282 | if (ccm1_etd == NULL) { | |
283 | dev_err(dev, "WUSB device doesn't support CCM1 encryption, " | |
284 | "can't use!\n"); | |
285 | result = -EINVAL; | |
b41ecf9a | 286 | goto out; |
d59db761 IPG |
287 | } |
288 | wusb_dev->ccm1_etd = *ccm1_etd; | |
bce83697 DV |
289 | dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n", |
290 | buf, wusb_et_name(ccm1_etd->bEncryptionType), | |
291 | ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex); | |
d59db761 | 292 | result = 0; |
d59db761 | 293 | out: |
b41ecf9a | 294 | kfree(secd); |
d59db761 | 295 | return result; |
d59db761 IPG |
296 | } |
297 | ||
298 | void wusb_dev_sec_rm(struct wusb_dev *wusb_dev) | |
299 | { | |
300 | /* Nothing so far */ | |
301 | } | |
302 | ||
d59db761 IPG |
303 | /** |
304 | * Update the address of an unauthenticated WUSB device | |
305 | * | |
306 | * Once we have successfully authenticated, we take it to addr0 state | |
307 | * and then to a normal address. | |
308 | * | |
309 | * Before the device's address (as known by it) was usb_dev->devnum | | |
310 | * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum. | |
311 | */ | |
4656d5de | 312 | int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) |
d59db761 IPG |
313 | { |
314 | int result = -ENOMEM; | |
315 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
316 | struct device *dev = &usb_dev->dev; | |
317 | u8 new_address = wusb_dev->addr & 0x7F; | |
318 | ||
319 | /* Set address 0 */ | |
320 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
7b3e3740 TP |
321 | USB_REQ_SET_ADDRESS, |
322 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
323 | 0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT); | |
d59db761 IPG |
324 | if (result < 0) { |
325 | dev_err(dev, "auth failed: can't set address 0: %d\n", | |
326 | result); | |
327 | goto error_addr0; | |
328 | } | |
329 | result = wusb_set_dev_addr(wusbhc, wusb_dev, 0); | |
330 | if (result < 0) | |
331 | goto error_addr0; | |
6da9c990 | 332 | usb_set_device_state(usb_dev, USB_STATE_DEFAULT); |
d59db761 IPG |
333 | usb_ep0_reinit(usb_dev); |
334 | ||
335 | /* Set new (authenticated) address. */ | |
336 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
7b3e3740 TP |
337 | USB_REQ_SET_ADDRESS, |
338 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
339 | new_address, 0, NULL, 0, | |
340 | USB_CTRL_SET_TIMEOUT); | |
d59db761 IPG |
341 | if (result < 0) { |
342 | dev_err(dev, "auth failed: can't set address %u: %d\n", | |
343 | new_address, result); | |
344 | goto error_addr; | |
345 | } | |
346 | result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address); | |
347 | if (result < 0) | |
348 | goto error_addr; | |
6da9c990 | 349 | usb_set_device_state(usb_dev, USB_STATE_ADDRESS); |
d59db761 IPG |
350 | usb_ep0_reinit(usb_dev); |
351 | usb_dev->authenticated = 1; | |
352 | error_addr: | |
353 | error_addr0: | |
354 | return result; | |
355 | } | |
356 | ||
357 | /* | |
358 | * | |
359 | * | |
360 | */ | |
361 | /* FIXME: split and cleanup */ | |
362 | int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, | |
363 | struct wusb_ckhdid *ck) | |
364 | { | |
365 | int result = -ENOMEM; | |
366 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
367 | struct device *dev = &usb_dev->dev; | |
368 | u32 tkid; | |
369 | __le32 tkid_le; | |
370 | struct usb_handshake *hs; | |
371 | struct aes_ccm_nonce ccm_n; | |
372 | u8 mic[8]; | |
373 | struct wusb_keydvt_in keydvt_in; | |
374 | struct wusb_keydvt_out keydvt_out; | |
375 | ||
d5ca9db8 | 376 | hs = kcalloc(3, sizeof(hs[0]), GFP_KERNEL); |
d59db761 IPG |
377 | if (hs == NULL) { |
378 | dev_err(dev, "can't allocate handshake data\n"); | |
379 | goto error_kzalloc; | |
380 | } | |
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); | |
389 | tkid_le = cpu_to_le32(tkid); | |
390 | ||
391 | hs[0].bMessageNumber = 1; | |
392 | hs[0].bStatus = 0; | |
393 | memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID)); | |
394 | hs[0].bReserved = 0; | |
395 | memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID)); | |
396 | get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce)); | |
521aea08 | 397 | memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */ |
d59db761 | 398 | |
d59db761 IPG |
399 | result = usb_control_msg( |
400 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
401 | USB_REQ_SET_HANDSHAKE, | |
402 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 403 | 1, 0, &hs[0], sizeof(hs[0]), USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
404 | if (result < 0) { |
405 | dev_err(dev, "Handshake1: request failed: %d\n", result); | |
406 | goto error_hs1; | |
407 | } | |
408 | ||
409 | /* Handshake 2, from the device -- need to verify fields */ | |
410 | result = usb_control_msg( | |
411 | usb_dev, usb_rcvctrlpipe(usb_dev, 0), | |
412 | USB_REQ_GET_HANDSHAKE, | |
413 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 414 | 2, 0, &hs[1], sizeof(hs[1]), USB_CTRL_GET_TIMEOUT); |
d59db761 IPG |
415 | if (result < 0) { |
416 | dev_err(dev, "Handshake2: request failed: %d\n", result); | |
417 | goto error_hs2; | |
418 | } | |
d59db761 IPG |
419 | |
420 | result = -EINVAL; | |
421 | if (hs[1].bMessageNumber != 2) { | |
422 | dev_err(dev, "Handshake2 failed: bad message number %u\n", | |
423 | hs[1].bMessageNumber); | |
424 | goto error_hs2; | |
425 | } | |
426 | if (hs[1].bStatus != 0) { | |
427 | dev_err(dev, "Handshake2 failed: bad status %u\n", | |
428 | hs[1].bStatus); | |
429 | goto error_hs2; | |
430 | } | |
431 | if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) { | |
432 | dev_err(dev, "Handshake2 failed: TKID mismatch " | |
433 | "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n", | |
434 | hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2], | |
435 | hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]); | |
436 | goto error_hs2; | |
437 | } | |
438 | if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) { | |
439 | dev_err(dev, "Handshake2 failed: CDID mismatch\n"); | |
440 | goto error_hs2; | |
441 | } | |
442 | ||
443 | /* Setup the CCM nonce */ | |
521aea08 | 444 | memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */ |
d59db761 IPG |
445 | memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid)); |
446 | ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr; | |
447 | ccm_n.dest_addr.data[0] = wusb_dev->addr; | |
448 | ccm_n.dest_addr.data[1] = 0; | |
449 | ||
450 | /* Derive the KCK and PTK from CK, the CCM, H and D nonces */ | |
451 | memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce)); | |
452 | memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce)); | |
453 | result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in); | |
454 | if (result < 0) { | |
455 | dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n", | |
456 | result); | |
457 | goto error_hs2; | |
458 | } | |
d59db761 IPG |
459 | |
460 | /* Compute MIC and verify it */ | |
461 | result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]); | |
462 | if (result < 0) { | |
463 | dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n", | |
464 | result); | |
465 | goto error_hs2; | |
466 | } | |
467 | ||
d59db761 IPG |
468 | if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) { |
469 | dev_err(dev, "Handshake2 failed: MIC mismatch\n"); | |
470 | goto error_hs2; | |
471 | } | |
472 | ||
473 | /* Send Handshake3 */ | |
474 | hs[2].bMessageNumber = 3; | |
475 | hs[2].bStatus = 0; | |
476 | memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID)); | |
477 | hs[2].bReserved = 0; | |
478 | memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID)); | |
479 | memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce)); | |
480 | result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]); | |
481 | if (result < 0) { | |
482 | dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n", | |
483 | result); | |
484 | goto error_hs2; | |
485 | } | |
486 | ||
d59db761 IPG |
487 | result = usb_control_msg( |
488 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
489 | USB_REQ_SET_HANDSHAKE, | |
490 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
7b3e3740 | 491 | 3, 0, &hs[2], sizeof(hs[2]), USB_CTRL_SET_TIMEOUT); |
d59db761 IPG |
492 | if (result < 0) { |
493 | dev_err(dev, "Handshake3: request failed: %d\n", result); | |
494 | goto error_hs3; | |
495 | } | |
496 | ||
d59db761 IPG |
497 | result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid, |
498 | keydvt_out.ptk, sizeof(keydvt_out.ptk)); | |
499 | if (result < 0) | |
500 | goto error_wusbhc_set_ptk; | |
501 | ||
d59db761 IPG |
502 | result = wusb_dev_set_gtk(wusbhc, wusb_dev); |
503 | if (result < 0) { | |
504 | dev_err(dev, "Set GTK for device: request failed: %d\n", | |
505 | result); | |
506 | goto error_wusbhc_set_gtk; | |
507 | } | |
508 | ||
509 | /* Update the device's address from unauth to auth */ | |
510 | if (usb_dev->authenticated == 0) { | |
d59db761 IPG |
511 | result = wusb_dev_update_address(wusbhc, wusb_dev); |
512 | if (result < 0) | |
513 | goto error_dev_update_address; | |
514 | } | |
515 | result = 0; | |
bce83697 | 516 | dev_info(dev, "device authenticated\n"); |
d59db761 IPG |
517 | |
518 | error_dev_update_address: | |
519 | error_wusbhc_set_gtk: | |
520 | error_wusbhc_set_ptk: | |
521 | error_hs3: | |
522 | error_hs2: | |
523 | error_hs1: | |
524 | memset(hs, 0, 3*sizeof(hs[0])); | |
eb94ec7a JL |
525 | memzero_explicit(&keydvt_out, sizeof(keydvt_out)); |
526 | memzero_explicit(&keydvt_in, sizeof(keydvt_in)); | |
527 | memzero_explicit(&ccm_n, sizeof(ccm_n)); | |
528 | memzero_explicit(mic, sizeof(mic)); | |
bce83697 | 529 | if (result < 0) |
d59db761 | 530 | wusb_dev_set_encryption(usb_dev, 0); |
d59db761 IPG |
531 | error_dev_set_encryption: |
532 | kfree(hs); | |
533 | error_kzalloc: | |
534 | return result; | |
535 | } | |
536 | ||
537 | /* | |
538 | * Once all connected and authenticated devices have received the new | |
539 | * GTK, switch the host to using it. | |
540 | */ | |
471e42ad | 541 | static void wusbhc_gtk_rekey_work(struct work_struct *work) |
d59db761 | 542 | { |
471e42ad TP |
543 | struct wusbhc *wusbhc = container_of(work, |
544 | struct wusbhc, gtk_rekey_work); | |
d59db761 | 545 | size_t key_size = sizeof(wusbhc->gtk.data); |
471e42ad TP |
546 | int port_idx; |
547 | struct wusb_dev *wusb_dev, *wusb_dev_next; | |
548 | LIST_HEAD(rekey_list); | |
d59db761 IPG |
549 | |
550 | mutex_lock(&wusbhc->mutex); | |
471e42ad TP |
551 | /* generate the new key */ |
552 | wusbhc_generate_gtk(wusbhc); | |
553 | /* roll the gtk index. */ | |
554 | wusbhc->gtk_index = (wusbhc->gtk_index + 1) % (WUSB_KEY_INDEX_MAX + 1); | |
555 | /* | |
556 | * Save all connected devices on a list while holding wusbhc->mutex and | |
557 | * take a reference to each one. Then submit the set key request to | |
558 | * them after releasing the lock in order to avoid a deadlock. | |
559 | */ | |
560 | for (port_idx = 0; port_idx < wusbhc->ports_max; port_idx++) { | |
561 | wusb_dev = wusbhc->port[port_idx].wusb_dev; | |
562 | if (!wusb_dev || !wusb_dev->usb_dev | |
563 | || !wusb_dev->usb_dev->authenticated) | |
564 | continue; | |
d59db761 | 565 | |
471e42ad TP |
566 | wusb_dev_get(wusb_dev); |
567 | list_add_tail(&wusb_dev->rekey_node, &rekey_list); | |
568 | } | |
d59db761 | 569 | mutex_unlock(&wusbhc->mutex); |
d59db761 | 570 | |
471e42ad TP |
571 | /* Submit the rekey requests without holding wusbhc->mutex. */ |
572 | list_for_each_entry_safe(wusb_dev, wusb_dev_next, &rekey_list, | |
573 | rekey_node) { | |
574 | list_del_init(&wusb_dev->rekey_node); | |
521aea08 RB |
575 | dev_dbg(&wusb_dev->usb_dev->dev, |
576 | "%s: rekey device at port %d\n", | |
471e42ad TP |
577 | __func__, wusb_dev->port_idx); |
578 | ||
579 | if (wusb_dev_set_gtk(wusbhc, wusb_dev) < 0) { | |
521aea08 RB |
580 | dev_err(&wusb_dev->usb_dev->dev, |
581 | "%s: rekey device at port %d failed\n", | |
471e42ad TP |
582 | __func__, wusb_dev->port_idx); |
583 | } | |
584 | wusb_dev_put(wusb_dev); | |
585 | } | |
d59db761 | 586 | |
471e42ad TP |
587 | /* Switch the host controller to use the new GTK. */ |
588 | mutex_lock(&wusbhc->mutex); | |
589 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, | |
590 | &wusbhc->gtk.descr.bKeyData, key_size); | |
591 | mutex_unlock(&wusbhc->mutex); | |
d59db761 IPG |
592 | } |
593 | ||
594 | /** | |
595 | * wusbhc_gtk_rekey - generate and distribute a new GTK | |
596 | * @wusbhc: the WUSB host controller | |
597 | * | |
598 | * Generate a new GTK and distribute it to all connected and | |
599 | * authenticated devices. When all devices have the new GTK, the host | |
600 | * starts using it. | |
601 | * | |
602 | * This must be called after every device disconnect (see [WUSB] | |
603 | * section 6.2.11.2). | |
604 | */ | |
605 | void wusbhc_gtk_rekey(struct wusbhc *wusbhc) | |
606 | { | |
471e42ad TP |
607 | /* |
608 | * We need to submit a URB to the downstream WUSB devices in order to | |
609 | * change the group key. This can't be done while holding the | |
610 | * wusbhc->mutex since that is also taken in the urb_enqueue routine | |
611 | * and will cause a deadlock. Instead, queue a work item to do | |
612 | * it when the lock is not held | |
613 | */ | |
275e517c | 614 | queue_work(wusbhc->wq_security, &wusbhc->gtk_rekey_work); |
d59db761 | 615 | } |