Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 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> |
| 26 | #include <linux/usb/ch9.h> |
| 27 | #include <linux/random.h> |
| 28 | #include "wusbhc.h" |
| 29 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 30 | static void wusbhc_set_gtk_callback(struct urb *urb); |
| 31 | static void wusbhc_gtk_rekey_done_work(struct work_struct *work); |
| 32 | |
| 33 | int wusbhc_sec_create(struct wusbhc *wusbhc) |
| 34 | { |
| 35 | wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) + sizeof(wusbhc->gtk.data); |
| 36 | wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY; |
| 37 | wusbhc->gtk.descr.bReserved = 0; |
| 38 | |
| 39 | wusbhc->gtk_index = wusb_key_index(0, WUSB_KEY_INDEX_TYPE_GTK, |
| 40 | WUSB_KEY_INDEX_ORIGINATOR_HOST); |
| 41 | |
| 42 | INIT_WORK(&wusbhc->gtk_rekey_done_work, wusbhc_gtk_rekey_done_work); |
| 43 | |
| 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | |
| 48 | /* Called when the HC is destroyed */ |
| 49 | void wusbhc_sec_destroy(struct wusbhc *wusbhc) |
| 50 | { |
| 51 | } |
| 52 | |
| 53 | |
| 54 | /** |
| 55 | * wusbhc_next_tkid - generate a new, currently unused, TKID |
| 56 | * @wusbhc: the WUSB host controller |
| 57 | * @wusb_dev: the device whose PTK the TKID is for |
| 58 | * (or NULL for a TKID for a GTK) |
| 59 | * |
| 60 | * The generated TKID consist of two parts: the device's authenicated |
| 61 | * address (or 0 or a GTK); and an incrementing number. This ensures |
| 62 | * that TKIDs cannot be shared between devices and by the time the |
| 63 | * incrementing number wraps around the older TKIDs will no longer be |
| 64 | * in use (a maximum of two keys may be active at any one time). |
| 65 | */ |
| 66 | static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) |
| 67 | { |
| 68 | u32 *tkid; |
| 69 | u32 addr; |
| 70 | |
| 71 | if (wusb_dev == NULL) { |
| 72 | tkid = &wusbhc->gtk_tkid; |
| 73 | addr = 0; |
| 74 | } else { |
| 75 | tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid; |
| 76 | addr = wusb_dev->addr & 0x7f; |
| 77 | } |
| 78 | |
| 79 | *tkid = (addr << 8) | ((*tkid + 1) & 0xff); |
| 80 | |
| 81 | return *tkid; |
| 82 | } |
| 83 | |
| 84 | static void wusbhc_generate_gtk(struct wusbhc *wusbhc) |
| 85 | { |
| 86 | const size_t key_size = sizeof(wusbhc->gtk.data); |
| 87 | u32 tkid; |
| 88 | |
| 89 | tkid = wusbhc_next_tkid(wusbhc, NULL); |
| 90 | |
| 91 | wusbhc->gtk.descr.tTKID[0] = (tkid >> 0) & 0xff; |
| 92 | wusbhc->gtk.descr.tTKID[1] = (tkid >> 8) & 0xff; |
| 93 | wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff; |
| 94 | |
| 95 | get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * wusbhc_sec_start - start the security management process |
| 100 | * @wusbhc: the WUSB host controller |
| 101 | * |
| 102 | * Generate and set an initial GTK on the host controller. |
| 103 | * |
| 104 | * Called when the HC is started. |
| 105 | */ |
| 106 | int wusbhc_sec_start(struct wusbhc *wusbhc) |
| 107 | { |
| 108 | const size_t key_size = sizeof(wusbhc->gtk.data); |
| 109 | int result; |
| 110 | |
| 111 | wusbhc_generate_gtk(wusbhc); |
| 112 | |
| 113 | result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, |
| 114 | &wusbhc->gtk.descr.bKeyData, key_size); |
| 115 | if (result < 0) |
| 116 | dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n", |
| 117 | result); |
| 118 | |
| 119 | return result; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * wusbhc_sec_stop - stop the security management process |
| 124 | * @wusbhc: the WUSB host controller |
| 125 | * |
| 126 | * Wait for any pending GTK rekeys to stop. |
| 127 | */ |
| 128 | void wusbhc_sec_stop(struct wusbhc *wusbhc) |
| 129 | { |
| 130 | cancel_work_sync(&wusbhc->gtk_rekey_done_work); |
| 131 | } |
| 132 | |
| 133 | |
| 134 | /** @returns encryption type name */ |
| 135 | const char *wusb_et_name(u8 x) |
| 136 | { |
| 137 | switch (x) { |
| 138 | case USB_ENC_TYPE_UNSECURE: return "unsecure"; |
| 139 | case USB_ENC_TYPE_WIRED: return "wired"; |
| 140 | case USB_ENC_TYPE_CCM_1: return "CCM-1"; |
| 141 | case USB_ENC_TYPE_RSA_1: return "RSA-1"; |
| 142 | default: return "unknown"; |
| 143 | } |
| 144 | } |
| 145 | EXPORT_SYMBOL_GPL(wusb_et_name); |
| 146 | |
| 147 | /* |
| 148 | * Set the device encryption method |
| 149 | * |
| 150 | * We tell the device which encryption method to use; we do this when |
| 151 | * setting up the device's security. |
| 152 | */ |
| 153 | static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value) |
| 154 | { |
| 155 | int result; |
| 156 | struct device *dev = &usb_dev->dev; |
| 157 | struct wusb_dev *wusb_dev = usb_dev->wusb_dev; |
| 158 | |
| 159 | if (value) { |
| 160 | value = wusb_dev->ccm1_etd.bEncryptionValue; |
| 161 | } else { |
| 162 | /* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */ |
| 163 | value = 0; |
| 164 | } |
| 165 | /* Set device's */ |
| 166 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), |
| 167 | USB_REQ_SET_ENCRYPTION, |
| 168 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 169 | value, 0, NULL, 0, 1000 /* FIXME: arbitrary */); |
| 170 | if (result < 0) |
| 171 | dev_err(dev, "Can't set device's WUSB encryption to " |
| 172 | "%s (value %d): %d\n", |
| 173 | wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType), |
| 174 | wusb_dev->ccm1_etd.bEncryptionValue, result); |
| 175 | return result; |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * Set the GTK to be used by a device. |
| 180 | * |
| 181 | * The device must be authenticated. |
| 182 | */ |
| 183 | static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) |
| 184 | { |
| 185 | struct usb_device *usb_dev = wusb_dev->usb_dev; |
| 186 | |
| 187 | return usb_control_msg( |
| 188 | usb_dev, usb_sndctrlpipe(usb_dev, 0), |
| 189 | USB_REQ_SET_DESCRIPTOR, |
| 190 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 191 | USB_DT_KEY << 8 | wusbhc->gtk_index, 0, |
| 192 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, |
| 193 | 1000); |
| 194 | } |
| 195 | |
| 196 | |
| 197 | /* FIXME: prototype for adding security */ |
| 198 | int wusb_dev_sec_add(struct wusbhc *wusbhc, |
| 199 | struct usb_device *usb_dev, struct wusb_dev *wusb_dev) |
| 200 | { |
| 201 | int result, bytes, secd_size; |
| 202 | struct device *dev = &usb_dev->dev; |
| 203 | struct usb_security_descriptor secd; |
| 204 | const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL; |
| 205 | void *secd_buf; |
| 206 | const void *itr, *top; |
| 207 | char buf[64]; |
| 208 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 209 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
| 210 | 0, &secd, sizeof(secd)); |
| 211 | if (result < sizeof(secd)) { |
| 212 | dev_err(dev, "Can't read security descriptor or " |
| 213 | "not enough data: %d\n", result); |
| 214 | goto error_secd; |
| 215 | } |
| 216 | secd_size = le16_to_cpu(secd.wTotalLength); |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 217 | secd_buf = kmalloc(secd_size, GFP_KERNEL); |
| 218 | if (secd_buf == NULL) { |
| 219 | dev_err(dev, "Can't allocate space for security descriptors\n"); |
| 220 | goto error_secd_alloc; |
| 221 | } |
| 222 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
| 223 | 0, secd_buf, secd_size); |
| 224 | if (result < secd_size) { |
| 225 | dev_err(dev, "Can't read security descriptor or " |
| 226 | "not enough data: %d\n", result); |
| 227 | goto error_secd_all; |
| 228 | } |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 229 | bytes = 0; |
| 230 | itr = secd_buf + sizeof(secd); |
| 231 | top = secd_buf + result; |
| 232 | while (itr < top) { |
| 233 | etd = itr; |
| 234 | if (top - itr < sizeof(*etd)) { |
| 235 | dev_err(dev, "BUG: bad device security descriptor; " |
| 236 | "not enough data (%zu vs %zu bytes left)\n", |
| 237 | top - itr, sizeof(*etd)); |
| 238 | break; |
| 239 | } |
| 240 | if (etd->bLength < sizeof(*etd)) { |
| 241 | dev_err(dev, "BUG: bad device encryption descriptor; " |
| 242 | "descriptor is too short " |
| 243 | "(%u vs %zu needed)\n", |
| 244 | etd->bLength, sizeof(*etd)); |
| 245 | break; |
| 246 | } |
| 247 | itr += etd->bLength; |
| 248 | bytes += snprintf(buf + bytes, sizeof(buf) - bytes, |
| 249 | "%s (0x%02x/%02x) ", |
| 250 | wusb_et_name(etd->bEncryptionType), |
| 251 | etd->bEncryptionValue, etd->bAuthKeyIndex); |
| 252 | if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1) |
| 253 | ccm1_etd = etd; |
| 254 | } |
| 255 | /* This code only supports CCM1 as of now. */ |
| 256 | /* FIXME: user has to choose which sec mode to use? |
| 257 | * In theory we want CCM */ |
| 258 | if (ccm1_etd == NULL) { |
| 259 | dev_err(dev, "WUSB device doesn't support CCM1 encryption, " |
| 260 | "can't use!\n"); |
| 261 | result = -EINVAL; |
| 262 | goto error_no_ccm1; |
| 263 | } |
| 264 | wusb_dev->ccm1_etd = *ccm1_etd; |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 265 | dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n", |
| 266 | buf, wusb_et_name(ccm1_etd->bEncryptionType), |
| 267 | ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex); |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 268 | result = 0; |
| 269 | kfree(secd_buf); |
| 270 | out: |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 271 | return result; |
| 272 | |
| 273 | |
| 274 | error_no_ccm1: |
| 275 | error_secd_all: |
| 276 | kfree(secd_buf); |
| 277 | error_secd_alloc: |
| 278 | error_secd: |
| 279 | goto out; |
| 280 | } |
| 281 | |
| 282 | void wusb_dev_sec_rm(struct wusb_dev *wusb_dev) |
| 283 | { |
| 284 | /* Nothing so far */ |
| 285 | } |
| 286 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 287 | /** |
| 288 | * Update the address of an unauthenticated WUSB device |
| 289 | * |
| 290 | * Once we have successfully authenticated, we take it to addr0 state |
| 291 | * and then to a normal address. |
| 292 | * |
| 293 | * Before the device's address (as known by it) was usb_dev->devnum | |
| 294 | * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum. |
| 295 | */ |
David Vrabel | 4656d5d | 2008-10-27 17:12:33 +0000 | [diff] [blame] | 296 | int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 297 | { |
| 298 | int result = -ENOMEM; |
| 299 | struct usb_device *usb_dev = wusb_dev->usb_dev; |
| 300 | struct device *dev = &usb_dev->dev; |
| 301 | u8 new_address = wusb_dev->addr & 0x7F; |
| 302 | |
| 303 | /* Set address 0 */ |
| 304 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), |
| 305 | USB_REQ_SET_ADDRESS, 0, |
| 306 | 0, 0, NULL, 0, 1000 /* FIXME: arbitrary */); |
| 307 | if (result < 0) { |
| 308 | dev_err(dev, "auth failed: can't set address 0: %d\n", |
| 309 | result); |
| 310 | goto error_addr0; |
| 311 | } |
| 312 | result = wusb_set_dev_addr(wusbhc, wusb_dev, 0); |
| 313 | if (result < 0) |
| 314 | goto error_addr0; |
David Vrabel | 6da9c99 | 2009-02-18 14:43:47 +0000 | [diff] [blame] | 315 | usb_set_device_state(usb_dev, USB_STATE_DEFAULT); |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 316 | usb_ep0_reinit(usb_dev); |
| 317 | |
| 318 | /* Set new (authenticated) address. */ |
| 319 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), |
| 320 | USB_REQ_SET_ADDRESS, 0, |
| 321 | new_address, 0, NULL, 0, |
| 322 | 1000 /* FIXME: arbitrary */); |
| 323 | if (result < 0) { |
| 324 | dev_err(dev, "auth failed: can't set address %u: %d\n", |
| 325 | new_address, result); |
| 326 | goto error_addr; |
| 327 | } |
| 328 | result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address); |
| 329 | if (result < 0) |
| 330 | goto error_addr; |
David Vrabel | 6da9c99 | 2009-02-18 14:43:47 +0000 | [diff] [blame] | 331 | usb_set_device_state(usb_dev, USB_STATE_ADDRESS); |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 332 | usb_ep0_reinit(usb_dev); |
| 333 | usb_dev->authenticated = 1; |
| 334 | error_addr: |
| 335 | error_addr0: |
| 336 | return result; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * |
| 341 | * |
| 342 | */ |
| 343 | /* FIXME: split and cleanup */ |
| 344 | int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, |
| 345 | struct wusb_ckhdid *ck) |
| 346 | { |
| 347 | int result = -ENOMEM; |
| 348 | struct usb_device *usb_dev = wusb_dev->usb_dev; |
| 349 | struct device *dev = &usb_dev->dev; |
| 350 | u32 tkid; |
| 351 | __le32 tkid_le; |
| 352 | struct usb_handshake *hs; |
| 353 | struct aes_ccm_nonce ccm_n; |
| 354 | u8 mic[8]; |
| 355 | struct wusb_keydvt_in keydvt_in; |
| 356 | struct wusb_keydvt_out keydvt_out; |
| 357 | |
| 358 | hs = kzalloc(3*sizeof(hs[0]), GFP_KERNEL); |
| 359 | if (hs == NULL) { |
| 360 | dev_err(dev, "can't allocate handshake data\n"); |
| 361 | goto error_kzalloc; |
| 362 | } |
| 363 | |
| 364 | /* We need to turn encryption before beginning the 4way |
| 365 | * hshake (WUSB1.0[.3.2.2]) */ |
| 366 | result = wusb_dev_set_encryption(usb_dev, 1); |
| 367 | if (result < 0) |
| 368 | goto error_dev_set_encryption; |
| 369 | |
| 370 | tkid = wusbhc_next_tkid(wusbhc, wusb_dev); |
| 371 | tkid_le = cpu_to_le32(tkid); |
| 372 | |
| 373 | hs[0].bMessageNumber = 1; |
| 374 | hs[0].bStatus = 0; |
| 375 | memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID)); |
| 376 | hs[0].bReserved = 0; |
| 377 | memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID)); |
| 378 | get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce)); |
| 379 | memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */ |
| 380 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 381 | result = usb_control_msg( |
| 382 | usb_dev, usb_sndctrlpipe(usb_dev, 0), |
| 383 | USB_REQ_SET_HANDSHAKE, |
| 384 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 385 | 1, 0, &hs[0], sizeof(hs[0]), 1000 /* FIXME: arbitrary */); |
| 386 | if (result < 0) { |
| 387 | dev_err(dev, "Handshake1: request failed: %d\n", result); |
| 388 | goto error_hs1; |
| 389 | } |
| 390 | |
| 391 | /* Handshake 2, from the device -- need to verify fields */ |
| 392 | result = usb_control_msg( |
| 393 | usb_dev, usb_rcvctrlpipe(usb_dev, 0), |
| 394 | USB_REQ_GET_HANDSHAKE, |
| 395 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 396 | 2, 0, &hs[1], sizeof(hs[1]), 1000 /* FIXME: arbitrary */); |
| 397 | if (result < 0) { |
| 398 | dev_err(dev, "Handshake2: request failed: %d\n", result); |
| 399 | goto error_hs2; |
| 400 | } |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 401 | |
| 402 | result = -EINVAL; |
| 403 | if (hs[1].bMessageNumber != 2) { |
| 404 | dev_err(dev, "Handshake2 failed: bad message number %u\n", |
| 405 | hs[1].bMessageNumber); |
| 406 | goto error_hs2; |
| 407 | } |
| 408 | if (hs[1].bStatus != 0) { |
| 409 | dev_err(dev, "Handshake2 failed: bad status %u\n", |
| 410 | hs[1].bStatus); |
| 411 | goto error_hs2; |
| 412 | } |
| 413 | if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) { |
| 414 | dev_err(dev, "Handshake2 failed: TKID mismatch " |
| 415 | "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n", |
| 416 | hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2], |
| 417 | hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]); |
| 418 | goto error_hs2; |
| 419 | } |
| 420 | if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) { |
| 421 | dev_err(dev, "Handshake2 failed: CDID mismatch\n"); |
| 422 | goto error_hs2; |
| 423 | } |
| 424 | |
| 425 | /* Setup the CCM nonce */ |
| 426 | memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */ |
| 427 | memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid)); |
| 428 | ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr; |
| 429 | ccm_n.dest_addr.data[0] = wusb_dev->addr; |
| 430 | ccm_n.dest_addr.data[1] = 0; |
| 431 | |
| 432 | /* Derive the KCK and PTK from CK, the CCM, H and D nonces */ |
| 433 | memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce)); |
| 434 | memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce)); |
| 435 | result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in); |
| 436 | if (result < 0) { |
| 437 | dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n", |
| 438 | result); |
| 439 | goto error_hs2; |
| 440 | } |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 441 | |
| 442 | /* Compute MIC and verify it */ |
| 443 | result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]); |
| 444 | if (result < 0) { |
| 445 | dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n", |
| 446 | result); |
| 447 | goto error_hs2; |
| 448 | } |
| 449 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 450 | if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) { |
| 451 | dev_err(dev, "Handshake2 failed: MIC mismatch\n"); |
| 452 | goto error_hs2; |
| 453 | } |
| 454 | |
| 455 | /* Send Handshake3 */ |
| 456 | hs[2].bMessageNumber = 3; |
| 457 | hs[2].bStatus = 0; |
| 458 | memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID)); |
| 459 | hs[2].bReserved = 0; |
| 460 | memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID)); |
| 461 | memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce)); |
| 462 | result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]); |
| 463 | if (result < 0) { |
| 464 | dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n", |
| 465 | result); |
| 466 | goto error_hs2; |
| 467 | } |
| 468 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 469 | result = usb_control_msg( |
| 470 | usb_dev, usb_sndctrlpipe(usb_dev, 0), |
| 471 | USB_REQ_SET_HANDSHAKE, |
| 472 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 473 | 3, 0, &hs[2], sizeof(hs[2]), 1000 /* FIXME: arbitrary */); |
| 474 | if (result < 0) { |
| 475 | dev_err(dev, "Handshake3: request failed: %d\n", result); |
| 476 | goto error_hs3; |
| 477 | } |
| 478 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 479 | result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid, |
| 480 | keydvt_out.ptk, sizeof(keydvt_out.ptk)); |
| 481 | if (result < 0) |
| 482 | goto error_wusbhc_set_ptk; |
| 483 | |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 484 | result = wusb_dev_set_gtk(wusbhc, wusb_dev); |
| 485 | if (result < 0) { |
| 486 | dev_err(dev, "Set GTK for device: request failed: %d\n", |
| 487 | result); |
| 488 | goto error_wusbhc_set_gtk; |
| 489 | } |
| 490 | |
| 491 | /* Update the device's address from unauth to auth */ |
| 492 | if (usb_dev->authenticated == 0) { |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 493 | result = wusb_dev_update_address(wusbhc, wusb_dev); |
| 494 | if (result < 0) |
| 495 | goto error_dev_update_address; |
| 496 | } |
| 497 | result = 0; |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 498 | dev_info(dev, "device authenticated\n"); |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 499 | |
| 500 | error_dev_update_address: |
| 501 | error_wusbhc_set_gtk: |
| 502 | error_wusbhc_set_ptk: |
| 503 | error_hs3: |
| 504 | error_hs2: |
| 505 | error_hs1: |
| 506 | memset(hs, 0, 3*sizeof(hs[0])); |
| 507 | memset(&keydvt_out, 0, sizeof(keydvt_out)); |
| 508 | memset(&keydvt_in, 0, sizeof(keydvt_in)); |
| 509 | memset(&ccm_n, 0, sizeof(ccm_n)); |
| 510 | memset(mic, 0, sizeof(mic)); |
David Vrabel | bce8369 | 2008-12-22 18:22:50 +0000 | [diff] [blame] | 511 | if (result < 0) |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 512 | wusb_dev_set_encryption(usb_dev, 0); |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 513 | error_dev_set_encryption: |
| 514 | kfree(hs); |
| 515 | error_kzalloc: |
| 516 | return result; |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * Once all connected and authenticated devices have received the new |
| 521 | * GTK, switch the host to using it. |
| 522 | */ |
| 523 | static void wusbhc_gtk_rekey_done_work(struct work_struct *work) |
| 524 | { |
| 525 | struct wusbhc *wusbhc = container_of(work, struct wusbhc, gtk_rekey_done_work); |
| 526 | size_t key_size = sizeof(wusbhc->gtk.data); |
| 527 | |
| 528 | mutex_lock(&wusbhc->mutex); |
| 529 | |
| 530 | if (--wusbhc->pending_set_gtks == 0) |
| 531 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); |
| 532 | |
| 533 | mutex_unlock(&wusbhc->mutex); |
| 534 | } |
| 535 | |
| 536 | static void wusbhc_set_gtk_callback(struct urb *urb) |
| 537 | { |
| 538 | struct wusbhc *wusbhc = urb->context; |
| 539 | |
| 540 | queue_work(wusbd, &wusbhc->gtk_rekey_done_work); |
| 541 | } |
| 542 | |
| 543 | /** |
| 544 | * wusbhc_gtk_rekey - generate and distribute a new GTK |
| 545 | * @wusbhc: the WUSB host controller |
| 546 | * |
| 547 | * Generate a new GTK and distribute it to all connected and |
| 548 | * authenticated devices. When all devices have the new GTK, the host |
| 549 | * starts using it. |
| 550 | * |
| 551 | * This must be called after every device disconnect (see [WUSB] |
| 552 | * section 6.2.11.2). |
| 553 | */ |
| 554 | void wusbhc_gtk_rekey(struct wusbhc *wusbhc) |
| 555 | { |
| 556 | static const size_t key_size = sizeof(wusbhc->gtk.data); |
| 557 | int p; |
| 558 | |
| 559 | wusbhc_generate_gtk(wusbhc); |
| 560 | |
| 561 | for (p = 0; p < wusbhc->ports_max; p++) { |
| 562 | struct wusb_dev *wusb_dev; |
| 563 | |
| 564 | wusb_dev = wusbhc->port[p].wusb_dev; |
Alexey Zaytsev | 542d886 | 2009-01-10 02:48:28 +0300 | [diff] [blame] | 565 | if (!wusb_dev || !wusb_dev->usb_dev || !wusb_dev->usb_dev->authenticated) |
Inaky Perez-Gonzalez | d59db76 | 2008-09-17 16:34:25 +0100 | [diff] [blame] | 566 | continue; |
| 567 | |
| 568 | usb_fill_control_urb(wusb_dev->set_gtk_urb, wusb_dev->usb_dev, |
| 569 | usb_sndctrlpipe(wusb_dev->usb_dev, 0), |
| 570 | (void *)wusb_dev->set_gtk_req, |
| 571 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, |
| 572 | wusbhc_set_gtk_callback, wusbhc); |
| 573 | if (usb_submit_urb(wusb_dev->set_gtk_urb, GFP_KERNEL) == 0) |
| 574 | wusbhc->pending_set_gtks++; |
| 575 | } |
| 576 | if (wusbhc->pending_set_gtks == 0) |
| 577 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); |
| 578 | } |