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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> | |
29 | #include "wusbhc.h" | |
30 | ||
d59db761 IPG |
31 | static void wusbhc_set_gtk_callback(struct urb *urb); |
32 | static void wusbhc_gtk_rekey_done_work(struct work_struct *work); | |
33 | ||
34 | int wusbhc_sec_create(struct wusbhc *wusbhc) | |
35 | { | |
36 | wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) + sizeof(wusbhc->gtk.data); | |
37 | wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY; | |
38 | wusbhc->gtk.descr.bReserved = 0; | |
39 | ||
40 | wusbhc->gtk_index = wusb_key_index(0, WUSB_KEY_INDEX_TYPE_GTK, | |
41 | WUSB_KEY_INDEX_ORIGINATOR_HOST); | |
42 | ||
43 | INIT_WORK(&wusbhc->gtk_rekey_done_work, wusbhc_gtk_rekey_done_work); | |
44 | ||
45 | return 0; | |
46 | } | |
47 | ||
48 | ||
49 | /* Called when the HC is destroyed */ | |
50 | void wusbhc_sec_destroy(struct wusbhc *wusbhc) | |
51 | { | |
52 | } | |
53 | ||
54 | ||
55 | /** | |
56 | * wusbhc_next_tkid - generate a new, currently unused, TKID | |
57 | * @wusbhc: the WUSB host controller | |
58 | * @wusb_dev: the device whose PTK the TKID is for | |
59 | * (or NULL for a TKID for a GTK) | |
60 | * | |
61 | * The generated TKID consist of two parts: the device's authenicated | |
62 | * address (or 0 or a GTK); and an incrementing number. This ensures | |
63 | * that TKIDs cannot be shared between devices and by the time the | |
64 | * incrementing number wraps around the older TKIDs will no longer be | |
65 | * in use (a maximum of two keys may be active at any one time). | |
66 | */ | |
67 | static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
68 | { | |
69 | u32 *tkid; | |
70 | u32 addr; | |
71 | ||
72 | if (wusb_dev == NULL) { | |
73 | tkid = &wusbhc->gtk_tkid; | |
74 | addr = 0; | |
75 | } else { | |
76 | tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid; | |
77 | addr = wusb_dev->addr & 0x7f; | |
78 | } | |
79 | ||
80 | *tkid = (addr << 8) | ((*tkid + 1) & 0xff); | |
81 | ||
82 | return *tkid; | |
83 | } | |
84 | ||
85 | static void wusbhc_generate_gtk(struct wusbhc *wusbhc) | |
86 | { | |
87 | const size_t key_size = sizeof(wusbhc->gtk.data); | |
88 | u32 tkid; | |
89 | ||
90 | tkid = wusbhc_next_tkid(wusbhc, NULL); | |
91 | ||
92 | wusbhc->gtk.descr.tTKID[0] = (tkid >> 0) & 0xff; | |
93 | wusbhc->gtk.descr.tTKID[1] = (tkid >> 8) & 0xff; | |
94 | wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff; | |
95 | ||
96 | get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size); | |
97 | } | |
98 | ||
99 | /** | |
100 | * wusbhc_sec_start - start the security management process | |
101 | * @wusbhc: the WUSB host controller | |
102 | * | |
103 | * Generate and set an initial GTK on the host controller. | |
104 | * | |
105 | * Called when the HC is started. | |
106 | */ | |
107 | int wusbhc_sec_start(struct wusbhc *wusbhc) | |
108 | { | |
109 | const size_t key_size = sizeof(wusbhc->gtk.data); | |
110 | int result; | |
111 | ||
112 | wusbhc_generate_gtk(wusbhc); | |
113 | ||
114 | result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, | |
115 | &wusbhc->gtk.descr.bKeyData, key_size); | |
116 | if (result < 0) | |
117 | dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n", | |
118 | result); | |
119 | ||
120 | return result; | |
121 | } | |
122 | ||
123 | /** | |
124 | * wusbhc_sec_stop - stop the security management process | |
125 | * @wusbhc: the WUSB host controller | |
126 | * | |
127 | * Wait for any pending GTK rekeys to stop. | |
128 | */ | |
129 | void wusbhc_sec_stop(struct wusbhc *wusbhc) | |
130 | { | |
131 | cancel_work_sync(&wusbhc->gtk_rekey_done_work); | |
132 | } | |
133 | ||
134 | ||
135 | /** @returns encryption type name */ | |
136 | const char *wusb_et_name(u8 x) | |
137 | { | |
138 | switch (x) { | |
139 | case USB_ENC_TYPE_UNSECURE: return "unsecure"; | |
140 | case USB_ENC_TYPE_WIRED: return "wired"; | |
141 | case USB_ENC_TYPE_CCM_1: return "CCM-1"; | |
142 | case USB_ENC_TYPE_RSA_1: return "RSA-1"; | |
143 | default: return "unknown"; | |
144 | } | |
145 | } | |
146 | EXPORT_SYMBOL_GPL(wusb_et_name); | |
147 | ||
148 | /* | |
149 | * Set the device encryption method | |
150 | * | |
151 | * We tell the device which encryption method to use; we do this when | |
152 | * setting up the device's security. | |
153 | */ | |
154 | static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value) | |
155 | { | |
156 | int result; | |
157 | struct device *dev = &usb_dev->dev; | |
158 | struct wusb_dev *wusb_dev = usb_dev->wusb_dev; | |
159 | ||
160 | if (value) { | |
161 | value = wusb_dev->ccm1_etd.bEncryptionValue; | |
162 | } else { | |
163 | /* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */ | |
164 | value = 0; | |
165 | } | |
166 | /* Set device's */ | |
167 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
168 | USB_REQ_SET_ENCRYPTION, | |
169 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
170 | value, 0, NULL, 0, 1000 /* FIXME: arbitrary */); | |
171 | if (result < 0) | |
172 | dev_err(dev, "Can't set device's WUSB encryption to " | |
173 | "%s (value %d): %d\n", | |
174 | wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType), | |
175 | wusb_dev->ccm1_etd.bEncryptionValue, result); | |
176 | return result; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Set the GTK to be used by a device. | |
181 | * | |
182 | * The device must be authenticated. | |
183 | */ | |
184 | static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
185 | { | |
186 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
187 | ||
188 | return usb_control_msg( | |
189 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
190 | USB_REQ_SET_DESCRIPTOR, | |
191 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
192 | USB_DT_KEY << 8 | wusbhc->gtk_index, 0, | |
193 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, | |
194 | 1000); | |
195 | } | |
196 | ||
197 | ||
198 | /* FIXME: prototype for adding security */ | |
199 | int wusb_dev_sec_add(struct wusbhc *wusbhc, | |
200 | struct usb_device *usb_dev, struct wusb_dev *wusb_dev) | |
201 | { | |
202 | int result, bytes, secd_size; | |
203 | struct device *dev = &usb_dev->dev; | |
b41ecf9a | 204 | struct usb_security_descriptor *secd; |
d59db761 | 205 | const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL; |
d59db761 IPG |
206 | const void *itr, *top; |
207 | char buf[64]; | |
208 | ||
9279095a | 209 | secd = kmalloc(sizeof(*secd), GFP_KERNEL); |
b41ecf9a SP |
210 | if (secd == NULL) { |
211 | result = -ENOMEM; | |
212 | goto out; | |
213 | } | |
214 | ||
d59db761 | 215 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
9279095a DV |
216 | 0, secd, sizeof(*secd)); |
217 | if (result < sizeof(*secd)) { | |
d59db761 IPG |
218 | dev_err(dev, "Can't read security descriptor or " |
219 | "not enough data: %d\n", result); | |
b41ecf9a | 220 | goto out; |
d59db761 | 221 | } |
b41ecf9a SP |
222 | secd_size = le16_to_cpu(secd->wTotalLength); |
223 | secd = krealloc(secd, secd_size, GFP_KERNEL); | |
224 | if (secd == NULL) { | |
d59db761 | 225 | dev_err(dev, "Can't allocate space for security descriptors\n"); |
b41ecf9a | 226 | goto out; |
d59db761 IPG |
227 | } |
228 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, | |
b41ecf9a | 229 | 0, secd, secd_size); |
d59db761 IPG |
230 | if (result < secd_size) { |
231 | dev_err(dev, "Can't read security descriptor or " | |
232 | "not enough data: %d\n", result); | |
b41ecf9a | 233 | goto out; |
d59db761 | 234 | } |
d59db761 | 235 | bytes = 0; |
b41ecf9a SP |
236 | itr = &secd[1]; |
237 | top = (void *)secd + result; | |
d59db761 IPG |
238 | while (itr < top) { |
239 | etd = itr; | |
240 | if (top - itr < sizeof(*etd)) { | |
241 | dev_err(dev, "BUG: bad device security descriptor; " | |
242 | "not enough data (%zu vs %zu bytes left)\n", | |
243 | top - itr, sizeof(*etd)); | |
244 | break; | |
245 | } | |
246 | if (etd->bLength < sizeof(*etd)) { | |
247 | dev_err(dev, "BUG: bad device encryption descriptor; " | |
248 | "descriptor is too short " | |
249 | "(%u vs %zu needed)\n", | |
250 | etd->bLength, sizeof(*etd)); | |
251 | break; | |
252 | } | |
253 | itr += etd->bLength; | |
254 | bytes += snprintf(buf + bytes, sizeof(buf) - bytes, | |
255 | "%s (0x%02x/%02x) ", | |
256 | wusb_et_name(etd->bEncryptionType), | |
257 | etd->bEncryptionValue, etd->bAuthKeyIndex); | |
258 | if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1) | |
259 | ccm1_etd = etd; | |
260 | } | |
261 | /* This code only supports CCM1 as of now. */ | |
262 | /* FIXME: user has to choose which sec mode to use? | |
263 | * In theory we want CCM */ | |
264 | if (ccm1_etd == NULL) { | |
265 | dev_err(dev, "WUSB device doesn't support CCM1 encryption, " | |
266 | "can't use!\n"); | |
267 | result = -EINVAL; | |
b41ecf9a | 268 | goto out; |
d59db761 IPG |
269 | } |
270 | wusb_dev->ccm1_etd = *ccm1_etd; | |
bce83697 DV |
271 | dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n", |
272 | buf, wusb_et_name(ccm1_etd->bEncryptionType), | |
273 | ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex); | |
d59db761 | 274 | result = 0; |
d59db761 | 275 | out: |
b41ecf9a | 276 | kfree(secd); |
d59db761 | 277 | return result; |
d59db761 IPG |
278 | } |
279 | ||
280 | void wusb_dev_sec_rm(struct wusb_dev *wusb_dev) | |
281 | { | |
282 | /* Nothing so far */ | |
283 | } | |
284 | ||
d59db761 IPG |
285 | /** |
286 | * Update the address of an unauthenticated WUSB device | |
287 | * | |
288 | * Once we have successfully authenticated, we take it to addr0 state | |
289 | * and then to a normal address. | |
290 | * | |
291 | * Before the device's address (as known by it) was usb_dev->devnum | | |
292 | * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum. | |
293 | */ | |
4656d5de | 294 | int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) |
d59db761 IPG |
295 | { |
296 | int result = -ENOMEM; | |
297 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
298 | struct device *dev = &usb_dev->dev; | |
299 | u8 new_address = wusb_dev->addr & 0x7F; | |
300 | ||
301 | /* Set address 0 */ | |
302 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
303 | USB_REQ_SET_ADDRESS, 0, | |
304 | 0, 0, NULL, 0, 1000 /* FIXME: arbitrary */); | |
305 | if (result < 0) { | |
306 | dev_err(dev, "auth failed: can't set address 0: %d\n", | |
307 | result); | |
308 | goto error_addr0; | |
309 | } | |
310 | result = wusb_set_dev_addr(wusbhc, wusb_dev, 0); | |
311 | if (result < 0) | |
312 | goto error_addr0; | |
6da9c990 | 313 | usb_set_device_state(usb_dev, USB_STATE_DEFAULT); |
d59db761 IPG |
314 | usb_ep0_reinit(usb_dev); |
315 | ||
316 | /* Set new (authenticated) address. */ | |
317 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
318 | USB_REQ_SET_ADDRESS, 0, | |
319 | new_address, 0, NULL, 0, | |
320 | 1000 /* FIXME: arbitrary */); | |
321 | if (result < 0) { | |
322 | dev_err(dev, "auth failed: can't set address %u: %d\n", | |
323 | new_address, result); | |
324 | goto error_addr; | |
325 | } | |
326 | result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address); | |
327 | if (result < 0) | |
328 | goto error_addr; | |
6da9c990 | 329 | usb_set_device_state(usb_dev, USB_STATE_ADDRESS); |
d59db761 IPG |
330 | usb_ep0_reinit(usb_dev); |
331 | usb_dev->authenticated = 1; | |
332 | error_addr: | |
333 | error_addr0: | |
334 | return result; | |
335 | } | |
336 | ||
337 | /* | |
338 | * | |
339 | * | |
340 | */ | |
341 | /* FIXME: split and cleanup */ | |
342 | int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, | |
343 | struct wusb_ckhdid *ck) | |
344 | { | |
345 | int result = -ENOMEM; | |
346 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
347 | struct device *dev = &usb_dev->dev; | |
348 | u32 tkid; | |
349 | __le32 tkid_le; | |
350 | struct usb_handshake *hs; | |
351 | struct aes_ccm_nonce ccm_n; | |
352 | u8 mic[8]; | |
353 | struct wusb_keydvt_in keydvt_in; | |
354 | struct wusb_keydvt_out keydvt_out; | |
355 | ||
356 | hs = kzalloc(3*sizeof(hs[0]), GFP_KERNEL); | |
357 | if (hs == NULL) { | |
358 | dev_err(dev, "can't allocate handshake data\n"); | |
359 | goto error_kzalloc; | |
360 | } | |
361 | ||
362 | /* We need to turn encryption before beginning the 4way | |
363 | * hshake (WUSB1.0[.3.2.2]) */ | |
364 | result = wusb_dev_set_encryption(usb_dev, 1); | |
365 | if (result < 0) | |
366 | goto error_dev_set_encryption; | |
367 | ||
368 | tkid = wusbhc_next_tkid(wusbhc, wusb_dev); | |
369 | tkid_le = cpu_to_le32(tkid); | |
370 | ||
371 | hs[0].bMessageNumber = 1; | |
372 | hs[0].bStatus = 0; | |
373 | memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID)); | |
374 | hs[0].bReserved = 0; | |
375 | memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID)); | |
376 | get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce)); | |
377 | memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */ | |
378 | ||
d59db761 IPG |
379 | result = usb_control_msg( |
380 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
381 | USB_REQ_SET_HANDSHAKE, | |
382 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
383 | 1, 0, &hs[0], sizeof(hs[0]), 1000 /* FIXME: arbitrary */); | |
384 | if (result < 0) { | |
385 | dev_err(dev, "Handshake1: request failed: %d\n", result); | |
386 | goto error_hs1; | |
387 | } | |
388 | ||
389 | /* Handshake 2, from the device -- need to verify fields */ | |
390 | result = usb_control_msg( | |
391 | usb_dev, usb_rcvctrlpipe(usb_dev, 0), | |
392 | USB_REQ_GET_HANDSHAKE, | |
393 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
394 | 2, 0, &hs[1], sizeof(hs[1]), 1000 /* FIXME: arbitrary */); | |
395 | if (result < 0) { | |
396 | dev_err(dev, "Handshake2: request failed: %d\n", result); | |
397 | goto error_hs2; | |
398 | } | |
d59db761 IPG |
399 | |
400 | result = -EINVAL; | |
401 | if (hs[1].bMessageNumber != 2) { | |
402 | dev_err(dev, "Handshake2 failed: bad message number %u\n", | |
403 | hs[1].bMessageNumber); | |
404 | goto error_hs2; | |
405 | } | |
406 | if (hs[1].bStatus != 0) { | |
407 | dev_err(dev, "Handshake2 failed: bad status %u\n", | |
408 | hs[1].bStatus); | |
409 | goto error_hs2; | |
410 | } | |
411 | if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) { | |
412 | dev_err(dev, "Handshake2 failed: TKID mismatch " | |
413 | "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n", | |
414 | hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2], | |
415 | hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]); | |
416 | goto error_hs2; | |
417 | } | |
418 | if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) { | |
419 | dev_err(dev, "Handshake2 failed: CDID mismatch\n"); | |
420 | goto error_hs2; | |
421 | } | |
422 | ||
423 | /* Setup the CCM nonce */ | |
424 | memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */ | |
425 | memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid)); | |
426 | ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr; | |
427 | ccm_n.dest_addr.data[0] = wusb_dev->addr; | |
428 | ccm_n.dest_addr.data[1] = 0; | |
429 | ||
430 | /* Derive the KCK and PTK from CK, the CCM, H and D nonces */ | |
431 | memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce)); | |
432 | memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce)); | |
433 | result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in); | |
434 | if (result < 0) { | |
435 | dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n", | |
436 | result); | |
437 | goto error_hs2; | |
438 | } | |
d59db761 IPG |
439 | |
440 | /* Compute MIC and verify it */ | |
441 | result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]); | |
442 | if (result < 0) { | |
443 | dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n", | |
444 | result); | |
445 | goto error_hs2; | |
446 | } | |
447 | ||
d59db761 IPG |
448 | if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) { |
449 | dev_err(dev, "Handshake2 failed: MIC mismatch\n"); | |
450 | goto error_hs2; | |
451 | } | |
452 | ||
453 | /* Send Handshake3 */ | |
454 | hs[2].bMessageNumber = 3; | |
455 | hs[2].bStatus = 0; | |
456 | memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID)); | |
457 | hs[2].bReserved = 0; | |
458 | memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID)); | |
459 | memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce)); | |
460 | result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]); | |
461 | if (result < 0) { | |
462 | dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n", | |
463 | result); | |
464 | goto error_hs2; | |
465 | } | |
466 | ||
d59db761 IPG |
467 | result = usb_control_msg( |
468 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
469 | USB_REQ_SET_HANDSHAKE, | |
470 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
471 | 3, 0, &hs[2], sizeof(hs[2]), 1000 /* FIXME: arbitrary */); | |
472 | if (result < 0) { | |
473 | dev_err(dev, "Handshake3: request failed: %d\n", result); | |
474 | goto error_hs3; | |
475 | } | |
476 | ||
d59db761 IPG |
477 | result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid, |
478 | keydvt_out.ptk, sizeof(keydvt_out.ptk)); | |
479 | if (result < 0) | |
480 | goto error_wusbhc_set_ptk; | |
481 | ||
d59db761 IPG |
482 | result = wusb_dev_set_gtk(wusbhc, wusb_dev); |
483 | if (result < 0) { | |
484 | dev_err(dev, "Set GTK for device: request failed: %d\n", | |
485 | result); | |
486 | goto error_wusbhc_set_gtk; | |
487 | } | |
488 | ||
489 | /* Update the device's address from unauth to auth */ | |
490 | if (usb_dev->authenticated == 0) { | |
d59db761 IPG |
491 | result = wusb_dev_update_address(wusbhc, wusb_dev); |
492 | if (result < 0) | |
493 | goto error_dev_update_address; | |
494 | } | |
495 | result = 0; | |
bce83697 | 496 | dev_info(dev, "device authenticated\n"); |
d59db761 IPG |
497 | |
498 | error_dev_update_address: | |
499 | error_wusbhc_set_gtk: | |
500 | error_wusbhc_set_ptk: | |
501 | error_hs3: | |
502 | error_hs2: | |
503 | error_hs1: | |
504 | memset(hs, 0, 3*sizeof(hs[0])); | |
505 | memset(&keydvt_out, 0, sizeof(keydvt_out)); | |
506 | memset(&keydvt_in, 0, sizeof(keydvt_in)); | |
507 | memset(&ccm_n, 0, sizeof(ccm_n)); | |
508 | memset(mic, 0, sizeof(mic)); | |
bce83697 | 509 | if (result < 0) |
d59db761 | 510 | wusb_dev_set_encryption(usb_dev, 0); |
d59db761 IPG |
511 | error_dev_set_encryption: |
512 | kfree(hs); | |
513 | error_kzalloc: | |
514 | return result; | |
515 | } | |
516 | ||
517 | /* | |
518 | * Once all connected and authenticated devices have received the new | |
519 | * GTK, switch the host to using it. | |
520 | */ | |
521 | static void wusbhc_gtk_rekey_done_work(struct work_struct *work) | |
522 | { | |
523 | struct wusbhc *wusbhc = container_of(work, struct wusbhc, gtk_rekey_done_work); | |
524 | size_t key_size = sizeof(wusbhc->gtk.data); | |
525 | ||
526 | mutex_lock(&wusbhc->mutex); | |
527 | ||
528 | if (--wusbhc->pending_set_gtks == 0) | |
529 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); | |
530 | ||
531 | mutex_unlock(&wusbhc->mutex); | |
532 | } | |
533 | ||
534 | static void wusbhc_set_gtk_callback(struct urb *urb) | |
535 | { | |
536 | struct wusbhc *wusbhc = urb->context; | |
537 | ||
538 | queue_work(wusbd, &wusbhc->gtk_rekey_done_work); | |
539 | } | |
540 | ||
541 | /** | |
542 | * wusbhc_gtk_rekey - generate and distribute a new GTK | |
543 | * @wusbhc: the WUSB host controller | |
544 | * | |
545 | * Generate a new GTK and distribute it to all connected and | |
546 | * authenticated devices. When all devices have the new GTK, the host | |
547 | * starts using it. | |
548 | * | |
549 | * This must be called after every device disconnect (see [WUSB] | |
550 | * section 6.2.11.2). | |
551 | */ | |
552 | void wusbhc_gtk_rekey(struct wusbhc *wusbhc) | |
553 | { | |
554 | static const size_t key_size = sizeof(wusbhc->gtk.data); | |
555 | int p; | |
556 | ||
557 | wusbhc_generate_gtk(wusbhc); | |
558 | ||
559 | for (p = 0; p < wusbhc->ports_max; p++) { | |
560 | struct wusb_dev *wusb_dev; | |
561 | ||
562 | wusb_dev = wusbhc->port[p].wusb_dev; | |
542d886b | 563 | if (!wusb_dev || !wusb_dev->usb_dev || !wusb_dev->usb_dev->authenticated) |
d59db761 IPG |
564 | continue; |
565 | ||
566 | usb_fill_control_urb(wusb_dev->set_gtk_urb, wusb_dev->usb_dev, | |
567 | usb_sndctrlpipe(wusb_dev->usb_dev, 0), | |
568 | (void *)wusb_dev->set_gtk_req, | |
569 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, | |
570 | wusbhc_set_gtk_callback, wusbhc); | |
571 | if (usb_submit_urb(wusb_dev->set_gtk_urb, GFP_KERNEL) == 0) | |
572 | wusbhc->pending_set_gtks++; | |
573 | } | |
574 | if (wusbhc->pending_set_gtks == 0) | |
575 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); | |
576 | } |