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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
8c520a59 GP |
23 | #include <linux/crypto.h> |
24 | #include <linux/scatterlist.h> | |
25 | #include <crypto/b128ops.h> | |
26 | ||
eb492e01 AB |
27 | #include <net/bluetooth/bluetooth.h> |
28 | #include <net/bluetooth/hci_core.h> | |
29 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 30 | #include <net/bluetooth/mgmt.h> |
ac4b7236 MH |
31 | |
32 | #include "smp.h" | |
d22ef0bc | 33 | |
17b02e62 | 34 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 35 | |
065a13e2 JH |
36 | #define AUTH_REQ_MASK 0x07 |
37 | ||
533e35d4 JH |
38 | enum { |
39 | SMP_FLAG_TK_VALID, | |
40 | SMP_FLAG_CFM_PENDING, | |
41 | SMP_FLAG_MITM_AUTH, | |
42 | SMP_FLAG_COMPLETE, | |
43 | SMP_FLAG_INITIATOR, | |
44 | }; | |
4bc58f51 JH |
45 | |
46 | struct smp_chan { | |
b68fda68 JH |
47 | struct l2cap_conn *conn; |
48 | struct delayed_work security_timer; | |
86d1407c | 49 | struct work_struct distribute_work; |
b68fda68 | 50 | |
4bc58f51 JH |
51 | u8 preq[7]; /* SMP Pairing Request */ |
52 | u8 prsp[7]; /* SMP Pairing Response */ | |
53 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
54 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
55 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
56 | u8 tk[16]; /* SMP Temporary Key */ | |
57 | u8 enc_key_size; | |
58 | u8 remote_key_dist; | |
59 | bdaddr_t id_addr; | |
60 | u8 id_addr_type; | |
61 | u8 irk[16]; | |
62 | struct smp_csrk *csrk; | |
63 | struct smp_csrk *slave_csrk; | |
64 | struct smp_ltk *ltk; | |
65 | struct smp_ltk *slave_ltk; | |
66 | struct smp_irk *remote_irk; | |
4a74d658 | 67 | unsigned long flags; |
6a7bd103 JH |
68 | |
69 | struct crypto_blkcipher *tfm_aes; | |
4bc58f51 JH |
70 | }; |
71 | ||
8a2936f4 | 72 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 73 | { |
8a2936f4 | 74 | size_t i; |
d22ef0bc | 75 | |
8a2936f4 JH |
76 | for (i = 0; i < len; i++) |
77 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
78 | } |
79 | ||
80 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
81 | { | |
82 | struct blkcipher_desc desc; | |
83 | struct scatterlist sg; | |
943a732a | 84 | uint8_t tmp[16], data[16]; |
201a5929 | 85 | int err; |
d22ef0bc AB |
86 | |
87 | if (tfm == NULL) { | |
88 | BT_ERR("tfm %p", tfm); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | desc.tfm = tfm; | |
93 | desc.flags = 0; | |
94 | ||
943a732a | 95 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 96 | swap_buf(k, tmp, 16); |
943a732a JH |
97 | |
98 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
99 | if (err) { |
100 | BT_ERR("cipher setkey failed: %d", err); | |
101 | return err; | |
102 | } | |
103 | ||
943a732a | 104 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 105 | swap_buf(r, data, 16); |
943a732a JH |
106 | |
107 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 108 | |
d22ef0bc AB |
109 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
110 | if (err) | |
111 | BT_ERR("Encrypt data error %d", err); | |
112 | ||
943a732a | 113 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 114 | swap_buf(data, r, 16); |
943a732a | 115 | |
d22ef0bc AB |
116 | return err; |
117 | } | |
118 | ||
60478054 JH |
119 | static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3]) |
120 | { | |
943a732a | 121 | u8 _res[16]; |
60478054 JH |
122 | int err; |
123 | ||
124 | /* r' = padding || r */ | |
943a732a JH |
125 | memcpy(_res, r, 3); |
126 | memset(_res + 3, 0, 13); | |
60478054 | 127 | |
943a732a | 128 | err = smp_e(tfm, irk, _res); |
60478054 JH |
129 | if (err) { |
130 | BT_ERR("Encrypt error"); | |
131 | return err; | |
132 | } | |
133 | ||
134 | /* The output of the random address function ah is: | |
135 | * ah(h, r) = e(k, r') mod 2^24 | |
136 | * The output of the security function e is then truncated to 24 bits | |
137 | * by taking the least significant 24 bits of the output of e as the | |
138 | * result of ah. | |
139 | */ | |
943a732a | 140 | memcpy(res, _res, 3); |
60478054 JH |
141 | |
142 | return 0; | |
143 | } | |
144 | ||
defce9e8 | 145 | bool smp_irk_matches(struct hci_dev *hdev, u8 irk[16], bdaddr_t *bdaddr) |
60478054 | 146 | { |
defce9e8 JH |
147 | struct l2cap_chan *chan = hdev->smp_data; |
148 | struct crypto_blkcipher *tfm; | |
60478054 JH |
149 | u8 hash[3]; |
150 | int err; | |
151 | ||
defce9e8 JH |
152 | if (!chan || !chan->data) |
153 | return false; | |
154 | ||
155 | tfm = chan->data; | |
156 | ||
60478054 JH |
157 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
158 | ||
159 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
160 | if (err) | |
161 | return false; | |
162 | ||
163 | return !memcmp(bdaddr->b, hash, 3); | |
164 | } | |
165 | ||
defce9e8 | 166 | int smp_generate_rpa(struct hci_dev *hdev, u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 167 | { |
defce9e8 JH |
168 | struct l2cap_chan *chan = hdev->smp_data; |
169 | struct crypto_blkcipher *tfm; | |
b1e2b3ae JH |
170 | int err; |
171 | ||
defce9e8 JH |
172 | if (!chan || !chan->data) |
173 | return -EOPNOTSUPP; | |
174 | ||
175 | tfm = chan->data; | |
176 | ||
b1e2b3ae JH |
177 | get_random_bytes(&rpa->b[3], 3); |
178 | ||
179 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
180 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
181 | ||
182 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
183 | if (err < 0) | |
184 | return err; | |
185 | ||
186 | BT_DBG("RPA %pMR", rpa); | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
ec70f36f JH |
191 | static int smp_c1(struct smp_chan *smp, u8 k[16], u8 r[16], u8 preq[7], |
192 | u8 pres[7], u8 _iat, bdaddr_t *ia, u8 _rat, bdaddr_t *ra, | |
193 | u8 res[16]) | |
d22ef0bc | 194 | { |
ec70f36f | 195 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
d22ef0bc AB |
196 | u8 p1[16], p2[16]; |
197 | int err; | |
198 | ||
ec70f36f JH |
199 | BT_DBG("%s", hdev->name); |
200 | ||
d22ef0bc AB |
201 | memset(p1, 0, 16); |
202 | ||
203 | /* p1 = pres || preq || _rat || _iat */ | |
943a732a JH |
204 | p1[0] = _iat; |
205 | p1[1] = _rat; | |
206 | memcpy(p1 + 2, preq, 7); | |
207 | memcpy(p1 + 9, pres, 7); | |
d22ef0bc AB |
208 | |
209 | /* p2 = padding || ia || ra */ | |
943a732a JH |
210 | memcpy(p2, ra, 6); |
211 | memcpy(p2 + 6, ia, 6); | |
212 | memset(p2 + 12, 0, 4); | |
d22ef0bc AB |
213 | |
214 | /* res = r XOR p1 */ | |
215 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
216 | ||
217 | /* res = e(k, res) */ | |
ec70f36f | 218 | err = smp_e(smp->tfm_aes, k, res); |
d22ef0bc AB |
219 | if (err) { |
220 | BT_ERR("Encrypt data error"); | |
221 | return err; | |
222 | } | |
223 | ||
224 | /* res = res XOR p2 */ | |
225 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
226 | ||
227 | /* res = e(k, res) */ | |
ec70f36f | 228 | err = smp_e(smp->tfm_aes, k, res); |
d22ef0bc AB |
229 | if (err) |
230 | BT_ERR("Encrypt data error"); | |
231 | ||
232 | return err; | |
233 | } | |
234 | ||
ec70f36f JH |
235 | static int smp_s1(struct smp_chan *smp, u8 k[16], u8 r1[16], u8 r2[16], |
236 | u8 _r[16]) | |
d22ef0bc | 237 | { |
ec70f36f | 238 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
d22ef0bc AB |
239 | int err; |
240 | ||
ec70f36f JH |
241 | BT_DBG("%s", hdev->name); |
242 | ||
d22ef0bc | 243 | /* Just least significant octets from r1 and r2 are considered */ |
943a732a JH |
244 | memcpy(_r, r2, 8); |
245 | memcpy(_r + 8, r1, 8); | |
d22ef0bc | 246 | |
ec70f36f | 247 | err = smp_e(smp->tfm_aes, k, _r); |
d22ef0bc AB |
248 | if (err) |
249 | BT_ERR("Encrypt data error"); | |
250 | ||
251 | return err; | |
252 | } | |
253 | ||
5d88cc73 | 254 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 255 | { |
5d88cc73 | 256 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 257 | struct smp_chan *smp; |
5d88cc73 JH |
258 | struct kvec iv[2]; |
259 | struct msghdr msg; | |
eb492e01 | 260 | |
5d88cc73 JH |
261 | if (!chan) |
262 | return; | |
eb492e01 | 263 | |
5d88cc73 | 264 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 265 | |
5d88cc73 JH |
266 | iv[0].iov_base = &code; |
267 | iv[0].iov_len = 1; | |
eb492e01 | 268 | |
5d88cc73 JH |
269 | iv[1].iov_base = data; |
270 | iv[1].iov_len = len; | |
eb492e01 | 271 | |
5d88cc73 | 272 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 273 | |
5d88cc73 JH |
274 | msg.msg_iov = (struct iovec *) &iv; |
275 | msg.msg_iovlen = 2; | |
eb492e01 | 276 | |
5d88cc73 | 277 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 278 | |
b68fda68 JH |
279 | if (!chan->data) |
280 | return; | |
281 | ||
282 | smp = chan->data; | |
283 | ||
284 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 285 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
286 | } |
287 | ||
2b64d153 BG |
288 | static __u8 authreq_to_seclevel(__u8 authreq) |
289 | { | |
290 | if (authreq & SMP_AUTH_MITM) | |
291 | return BT_SECURITY_HIGH; | |
292 | else | |
293 | return BT_SECURITY_MEDIUM; | |
294 | } | |
295 | ||
296 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
297 | { | |
298 | switch (sec_level) { | |
299 | case BT_SECURITY_HIGH: | |
300 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
301 | case BT_SECURITY_MEDIUM: | |
302 | return SMP_AUTH_BONDING; | |
303 | default: | |
304 | return SMP_AUTH_NONE; | |
305 | } | |
306 | } | |
307 | ||
b8e66eac | 308 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
309 | struct smp_cmd_pairing *req, |
310 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 311 | { |
5d88cc73 JH |
312 | struct l2cap_chan *chan = conn->smp; |
313 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
314 | struct hci_conn *hcon = conn->hcon; |
315 | struct hci_dev *hdev = hcon->hdev; | |
316 | u8 local_dist = 0, remote_dist = 0; | |
54790f73 | 317 | |
b6ae8457 | 318 | if (test_bit(HCI_BONDABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
319 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
320 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 321 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
322 | } else { |
323 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
324 | } |
325 | ||
fd349c02 JH |
326 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
327 | remote_dist |= SMP_DIST_ID_KEY; | |
328 | ||
863efaf2 JH |
329 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
330 | local_dist |= SMP_DIST_ID_KEY; | |
331 | ||
54790f73 VCG |
332 | if (rsp == NULL) { |
333 | req->io_capability = conn->hcon->io_capability; | |
334 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
335 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
336 | req->init_key_dist = local_dist; |
337 | req->resp_key_dist = remote_dist; | |
065a13e2 | 338 | req->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
339 | |
340 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
341 | return; |
342 | } | |
343 | ||
344 | rsp->io_capability = conn->hcon->io_capability; | |
345 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
346 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
347 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
348 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
065a13e2 | 349 | rsp->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
350 | |
351 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
352 | } |
353 | ||
3158c50c VCG |
354 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
355 | { | |
5d88cc73 JH |
356 | struct l2cap_chan *chan = conn->smp; |
357 | struct smp_chan *smp = chan->data; | |
1c1def09 | 358 | |
3158c50c | 359 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 360 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
361 | return SMP_ENC_KEY_SIZE; |
362 | ||
f7aa611a | 363 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
364 | |
365 | return 0; | |
366 | } | |
367 | ||
6f48e260 JH |
368 | static void smp_chan_destroy(struct l2cap_conn *conn) |
369 | { | |
370 | struct l2cap_chan *chan = conn->smp; | |
371 | struct smp_chan *smp = chan->data; | |
372 | bool complete; | |
373 | ||
374 | BUG_ON(!smp); | |
375 | ||
376 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 JH |
377 | |
378 | if (work_pending(&smp->distribute_work)) { | |
379 | cancel_work_sync(&smp->distribute_work); | |
380 | if (!chan->data) | |
381 | return; | |
382 | } | |
383 | ||
384 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); | |
385 | mgmt_smp_complete(conn->hcon, complete); | |
386 | ||
387 | kfree(smp->csrk); | |
388 | kfree(smp->slave_csrk); | |
389 | ||
390 | crypto_free_blkcipher(smp->tfm_aes); | |
391 | ||
392 | /* If pairing failed clean up any keys we might have */ | |
393 | if (!complete) { | |
394 | if (smp->ltk) { | |
395 | list_del(&smp->ltk->list); | |
396 | kfree(smp->ltk); | |
397 | } | |
398 | ||
399 | if (smp->slave_ltk) { | |
400 | list_del(&smp->slave_ltk->list); | |
401 | kfree(smp->slave_ltk); | |
402 | } | |
403 | ||
404 | if (smp->remote_irk) { | |
405 | list_del(&smp->remote_irk->list); | |
406 | kfree(smp->remote_irk); | |
407 | } | |
408 | } | |
409 | ||
410 | chan->data = NULL; | |
411 | kfree(smp); | |
412 | hci_conn_drop(conn->hcon); | |
413 | } | |
414 | ||
84794e11 | 415 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 416 | { |
bab73cb6 | 417 | struct hci_conn *hcon = conn->hcon; |
b68fda68 JH |
418 | struct l2cap_chan *chan = conn->smp; |
419 | struct smp_chan *smp; | |
bab73cb6 | 420 | |
84794e11 | 421 | if (reason) |
4f957a76 | 422 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 423 | &reason); |
4f957a76 | 424 | |
ce39fb4e MH |
425 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
426 | mgmt_auth_failed(hcon->hdev, &hcon->dst, hcon->type, hcon->dst_type, | |
427 | HCI_ERROR_AUTH_FAILURE); | |
f1c09c07 | 428 | |
b68fda68 JH |
429 | if (!chan->data) |
430 | return; | |
431 | ||
432 | smp = chan->data; | |
433 | ||
ce39fb4e | 434 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
f1c09c07 | 435 | smp_chan_destroy(conn); |
4f957a76 BG |
436 | } |
437 | ||
2b64d153 BG |
438 | #define JUST_WORKS 0x00 |
439 | #define JUST_CFM 0x01 | |
440 | #define REQ_PASSKEY 0x02 | |
441 | #define CFM_PASSKEY 0x03 | |
442 | #define REQ_OOB 0x04 | |
443 | #define OVERLAP 0xFF | |
444 | ||
445 | static const u8 gen_method[5][5] = { | |
446 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
447 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
448 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
449 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
450 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
451 | }; | |
452 | ||
581370cc JH |
453 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
454 | { | |
2bcd4003 JH |
455 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
456 | * converted later to JUST_WORKS if we're initiators. | |
457 | */ | |
581370cc JH |
458 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
459 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 460 | return JUST_CFM; |
581370cc JH |
461 | |
462 | return gen_method[remote_io][local_io]; | |
463 | } | |
464 | ||
2b64d153 BG |
465 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
466 | u8 local_io, u8 remote_io) | |
467 | { | |
468 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
469 | struct l2cap_chan *chan = conn->smp; |
470 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
471 | u8 method; |
472 | u32 passkey = 0; | |
473 | int ret = 0; | |
474 | ||
475 | /* Initialize key for JUST WORKS */ | |
476 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 477 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
478 | |
479 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
480 | ||
2bcd4003 JH |
481 | /* If neither side wants MITM, either "just" confirm an incoming |
482 | * request or use just-works for outgoing ones. The JUST_CFM | |
483 | * will be converted to JUST_WORKS if necessary later in this | |
484 | * function. If either side has MITM look up the method from the | |
485 | * table. | |
486 | */ | |
581370cc | 487 | if (!(auth & SMP_AUTH_MITM)) |
2bcd4003 | 488 | method = JUST_CFM; |
2b64d153 | 489 | else |
581370cc | 490 | method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 491 | |
a82505c7 | 492 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 493 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
494 | method = JUST_WORKS; |
495 | ||
02f3e254 JH |
496 | /* Don't bother user space with no IO capabilities */ |
497 | if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
498 | method = JUST_WORKS; | |
499 | ||
2b64d153 BG |
500 | /* If Just Works, Continue with Zero TK */ |
501 | if (method == JUST_WORKS) { | |
4a74d658 | 502 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
503 | return 0; |
504 | } | |
505 | ||
506 | /* Not Just Works/Confirm results in MITM Authentication */ | |
507 | if (method != JUST_CFM) | |
4a74d658 | 508 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
2b64d153 BG |
509 | |
510 | /* If both devices have Keyoard-Display I/O, the master | |
511 | * Confirms and the slave Enters the passkey. | |
512 | */ | |
513 | if (method == OVERLAP) { | |
40bef302 | 514 | if (hcon->role == HCI_ROLE_MASTER) |
2b64d153 BG |
515 | method = CFM_PASSKEY; |
516 | else | |
517 | method = REQ_PASSKEY; | |
518 | } | |
519 | ||
01ad34d2 | 520 | /* Generate random passkey. */ |
2b64d153 | 521 | if (method == CFM_PASSKEY) { |
943a732a | 522 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
523 | get_random_bytes(&passkey, sizeof(passkey)); |
524 | passkey %= 1000000; | |
943a732a | 525 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 526 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 527 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
528 | } |
529 | ||
530 | hci_dev_lock(hcon->hdev); | |
531 | ||
532 | if (method == REQ_PASSKEY) | |
ce39fb4e | 533 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 534 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
535 | else if (method == JUST_CFM) |
536 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
537 | hcon->type, hcon->dst_type, | |
538 | passkey, 1); | |
2b64d153 | 539 | else |
01ad34d2 | 540 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 541 | hcon->type, hcon->dst_type, |
39adbffe | 542 | passkey, 0); |
2b64d153 BG |
543 | |
544 | hci_dev_unlock(hcon->hdev); | |
545 | ||
546 | return ret; | |
547 | } | |
548 | ||
1cc61144 | 549 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 550 | { |
8aab4757 | 551 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
552 | struct smp_cmd_pairing_confirm cp; |
553 | int ret; | |
8aab4757 VCG |
554 | |
555 | BT_DBG("conn %p", conn); | |
556 | ||
ec70f36f | 557 | ret = smp_c1(smp, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 558 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
559 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
560 | cp.confirm_val); | |
1cc61144 JH |
561 | if (ret) |
562 | return SMP_UNSPECIFIED; | |
8aab4757 | 563 | |
4a74d658 | 564 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 565 | |
8aab4757 VCG |
566 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
567 | ||
1cc61144 | 568 | return 0; |
8aab4757 VCG |
569 | } |
570 | ||
861580a9 | 571 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 572 | { |
8aab4757 VCG |
573 | struct l2cap_conn *conn = smp->conn; |
574 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 575 | u8 confirm[16]; |
8aab4757 VCG |
576 | int ret; |
577 | ||
ec70f36f | 578 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 579 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
580 | |
581 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
582 | ||
ec70f36f | 583 | ret = smp_c1(smp, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 584 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 585 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
586 | if (ret) |
587 | return SMP_UNSPECIFIED; | |
8aab4757 | 588 | |
8aab4757 VCG |
589 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
590 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 591 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
592 | } |
593 | ||
594 | if (hcon->out) { | |
fe39c7b2 MH |
595 | u8 stk[16]; |
596 | __le64 rand = 0; | |
597 | __le16 ediv = 0; | |
8aab4757 | 598 | |
ec70f36f | 599 | smp_s1(smp, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 600 | |
f7aa611a | 601 | memset(stk + smp->enc_key_size, 0, |
04124681 | 602 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 603 | |
861580a9 JH |
604 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
605 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
606 | |
607 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 608 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 609 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 610 | } else { |
fff3490f | 611 | u8 stk[16], auth; |
fe39c7b2 MH |
612 | __le64 rand = 0; |
613 | __le16 ediv = 0; | |
8aab4757 | 614 | |
943a732a JH |
615 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
616 | smp->prnd); | |
8aab4757 | 617 | |
ec70f36f | 618 | smp_s1(smp, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 619 | |
f7aa611a | 620 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 621 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 622 | |
fff3490f JH |
623 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
624 | auth = 1; | |
625 | else | |
626 | auth = 0; | |
627 | ||
7d5843b7 JH |
628 | /* Even though there's no _SLAVE suffix this is the |
629 | * slave STK we're adding for later lookup (the master | |
630 | * STK never needs to be stored). | |
631 | */ | |
ce39fb4e | 632 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 633 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
634 | } |
635 | ||
861580a9 | 636 | return 0; |
8aab4757 VCG |
637 | } |
638 | ||
44f1a7ab JH |
639 | static void smp_notify_keys(struct l2cap_conn *conn) |
640 | { | |
641 | struct l2cap_chan *chan = conn->smp; | |
642 | struct smp_chan *smp = chan->data; | |
643 | struct hci_conn *hcon = conn->hcon; | |
644 | struct hci_dev *hdev = hcon->hdev; | |
645 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
646 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
647 | bool persistent; | |
648 | ||
649 | if (smp->remote_irk) { | |
650 | mgmt_new_irk(hdev, smp->remote_irk); | |
651 | /* Now that user space can be considered to know the | |
652 | * identity address track the connection based on it | |
653 | * from now on. | |
654 | */ | |
655 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
656 | hcon->dst_type = smp->remote_irk->addr_type; | |
f3d82d0c | 657 | queue_work(hdev->workqueue, &conn->id_addr_update_work); |
44f1a7ab JH |
658 | |
659 | /* When receiving an indentity resolving key for | |
660 | * a remote device that does not use a resolvable | |
661 | * private address, just remove the key so that | |
662 | * it is possible to use the controller white | |
663 | * list for scanning. | |
664 | * | |
665 | * Userspace will have been told to not store | |
666 | * this key at this point. So it is safe to | |
667 | * just remove it. | |
668 | */ | |
669 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
670 | list_del(&smp->remote_irk->list); | |
671 | kfree(smp->remote_irk); | |
672 | smp->remote_irk = NULL; | |
673 | } | |
674 | } | |
675 | ||
676 | /* The LTKs and CSRKs should be persistent only if both sides | |
677 | * had the bonding bit set in their authentication requests. | |
678 | */ | |
679 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
680 | ||
681 | if (smp->csrk) { | |
682 | smp->csrk->bdaddr_type = hcon->dst_type; | |
683 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
684 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
685 | } | |
686 | ||
687 | if (smp->slave_csrk) { | |
688 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
689 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
690 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
691 | } | |
692 | ||
693 | if (smp->ltk) { | |
694 | smp->ltk->bdaddr_type = hcon->dst_type; | |
695 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
696 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
697 | } | |
698 | ||
699 | if (smp->slave_ltk) { | |
700 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
701 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
702 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
703 | } | |
704 | } | |
705 | ||
86d1407c | 706 | static void smp_distribute_keys(struct work_struct *work) |
44f1a7ab | 707 | { |
86d1407c JH |
708 | struct smp_chan *smp = container_of(work, struct smp_chan, |
709 | distribute_work); | |
44f1a7ab | 710 | struct smp_cmd_pairing *req, *rsp; |
86d1407c | 711 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
712 | struct hci_conn *hcon = conn->hcon; |
713 | struct hci_dev *hdev = hcon->hdev; | |
714 | __u8 *keydist; | |
715 | ||
716 | BT_DBG("conn %p", conn); | |
717 | ||
718 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) | |
86d1407c | 719 | return; |
44f1a7ab JH |
720 | |
721 | rsp = (void *) &smp->prsp[1]; | |
722 | ||
723 | /* The responder sends its keys first */ | |
724 | if (hcon->out && (smp->remote_key_dist & 0x07)) | |
86d1407c | 725 | return; |
44f1a7ab JH |
726 | |
727 | req = (void *) &smp->preq[1]; | |
728 | ||
729 | if (hcon->out) { | |
730 | keydist = &rsp->init_key_dist; | |
731 | *keydist &= req->init_key_dist; | |
732 | } else { | |
733 | keydist = &rsp->resp_key_dist; | |
734 | *keydist &= req->resp_key_dist; | |
735 | } | |
736 | ||
737 | BT_DBG("keydist 0x%x", *keydist); | |
738 | ||
739 | if (*keydist & SMP_DIST_ENC_KEY) { | |
740 | struct smp_cmd_encrypt_info enc; | |
741 | struct smp_cmd_master_ident ident; | |
742 | struct smp_ltk *ltk; | |
743 | u8 authenticated; | |
744 | __le16 ediv; | |
745 | __le64 rand; | |
746 | ||
747 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
748 | get_random_bytes(&ediv, sizeof(ediv)); | |
749 | get_random_bytes(&rand, sizeof(rand)); | |
750 | ||
751 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
752 | ||
753 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
754 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
755 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
756 | smp->enc_key_size, ediv, rand); | |
757 | smp->slave_ltk = ltk; | |
758 | ||
759 | ident.ediv = ediv; | |
760 | ident.rand = rand; | |
761 | ||
762 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
763 | ||
764 | *keydist &= ~SMP_DIST_ENC_KEY; | |
765 | } | |
766 | ||
767 | if (*keydist & SMP_DIST_ID_KEY) { | |
768 | struct smp_cmd_ident_addr_info addrinfo; | |
769 | struct smp_cmd_ident_info idinfo; | |
770 | ||
771 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
772 | ||
773 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
774 | ||
775 | /* The hci_conn contains the local identity address | |
776 | * after the connection has been established. | |
777 | * | |
778 | * This is true even when the connection has been | |
779 | * established using a resolvable random address. | |
780 | */ | |
781 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
782 | addrinfo.addr_type = hcon->src_type; | |
783 | ||
784 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
785 | &addrinfo); | |
786 | ||
787 | *keydist &= ~SMP_DIST_ID_KEY; | |
788 | } | |
789 | ||
790 | if (*keydist & SMP_DIST_SIGN) { | |
791 | struct smp_cmd_sign_info sign; | |
792 | struct smp_csrk *csrk; | |
793 | ||
794 | /* Generate a new random key */ | |
795 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
796 | ||
797 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
798 | if (csrk) { | |
799 | csrk->master = 0x00; | |
800 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
801 | } | |
802 | smp->slave_csrk = csrk; | |
803 | ||
804 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
805 | ||
806 | *keydist &= ~SMP_DIST_SIGN; | |
807 | } | |
808 | ||
809 | /* If there are still keys to be received wait for them */ | |
810 | if ((smp->remote_key_dist & 0x07)) | |
86d1407c | 811 | return; |
44f1a7ab JH |
812 | |
813 | clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags); | |
44f1a7ab JH |
814 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
815 | smp_notify_keys(conn); | |
816 | ||
817 | smp_chan_destroy(conn); | |
44f1a7ab JH |
818 | } |
819 | ||
b68fda68 JH |
820 | static void smp_timeout(struct work_struct *work) |
821 | { | |
822 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
823 | security_timer.work); | |
824 | struct l2cap_conn *conn = smp->conn; | |
825 | ||
826 | BT_DBG("conn %p", conn); | |
827 | ||
1e91c29e | 828 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
829 | } |
830 | ||
8aab4757 VCG |
831 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
832 | { | |
5d88cc73 | 833 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
834 | struct smp_chan *smp; |
835 | ||
f1560463 | 836 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
616d55be JH |
837 | if (!smp) { |
838 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); | |
8aab4757 | 839 | return NULL; |
616d55be | 840 | } |
8aab4757 | 841 | |
6a7bd103 JH |
842 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
843 | if (IS_ERR(smp->tfm_aes)) { | |
844 | BT_ERR("Unable to create ECB crypto context"); | |
845 | kfree(smp); | |
616d55be | 846 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); |
6a7bd103 JH |
847 | return NULL; |
848 | } | |
849 | ||
8aab4757 | 850 | smp->conn = conn; |
5d88cc73 | 851 | chan->data = smp; |
8aab4757 | 852 | |
86d1407c | 853 | INIT_WORK(&smp->distribute_work, smp_distribute_keys); |
b68fda68 JH |
854 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
855 | ||
8aab4757 VCG |
856 | hci_conn_hold(conn->hcon); |
857 | ||
858 | return smp; | |
859 | } | |
860 | ||
2b64d153 BG |
861 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
862 | { | |
b10e8017 | 863 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 864 | struct l2cap_chan *chan; |
2b64d153 BG |
865 | struct smp_chan *smp; |
866 | u32 value; | |
2b64d153 BG |
867 | |
868 | BT_DBG(""); | |
869 | ||
642ac774 | 870 | if (!conn || !test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
2b64d153 BG |
871 | return -ENOTCONN; |
872 | ||
5d88cc73 JH |
873 | chan = conn->smp; |
874 | if (!chan) | |
875 | return -ENOTCONN; | |
876 | ||
877 | smp = chan->data; | |
2b64d153 BG |
878 | |
879 | switch (mgmt_op) { | |
880 | case MGMT_OP_USER_PASSKEY_REPLY: | |
881 | value = le32_to_cpu(passkey); | |
943a732a | 882 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 883 | BT_DBG("PassKey: %d", value); |
943a732a | 884 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
885 | /* Fall Through */ |
886 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 887 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
888 | break; |
889 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
890 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 891 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
892 | return 0; |
893 | default: | |
84794e11 | 894 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
895 | return -EOPNOTSUPP; |
896 | } | |
897 | ||
898 | /* If it is our turn to send Pairing Confirm, do so now */ | |
1cc61144 JH |
899 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
900 | u8 rsp = smp_confirm(smp); | |
901 | if (rsp) | |
902 | smp_failure(conn, rsp); | |
903 | } | |
2b64d153 BG |
904 | |
905 | return 0; | |
906 | } | |
907 | ||
da85e5e5 | 908 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 909 | { |
3158c50c | 910 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
b3c6410b | 911 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 912 | struct smp_chan *smp; |
c7262e71 | 913 | u8 key_size, auth, sec_level; |
8aab4757 | 914 | int ret; |
88ba43b6 AB |
915 | |
916 | BT_DBG("conn %p", conn); | |
917 | ||
c46b98be | 918 | if (skb->len < sizeof(*req)) |
38e4a915 | 919 | return SMP_INVALID_PARAMS; |
c46b98be | 920 | |
40bef302 | 921 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
922 | return SMP_CMD_NOTSUPP; |
923 | ||
5d88cc73 | 924 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { |
8aab4757 | 925 | smp = smp_chan_create(conn); |
5d88cc73 JH |
926 | } else { |
927 | struct l2cap_chan *chan = conn->smp; | |
928 | smp = chan->data; | |
929 | } | |
8aab4757 | 930 | |
d08fd0e7 AE |
931 | if (!smp) |
932 | return SMP_UNSPECIFIED; | |
d26a2345 | 933 | |
b6ae8457 | 934 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
b3c6410b JH |
935 | (req->auth_req & SMP_AUTH_BONDING)) |
936 | return SMP_PAIRING_NOTSUPP; | |
937 | ||
1c1def09 VCG |
938 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
939 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 940 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 941 | |
2b64d153 | 942 | /* We didn't start the pairing, so match remote */ |
1ef35827 | 943 | auth = req->auth_req; |
da85e5e5 | 944 | |
c7262e71 JH |
945 | sec_level = authreq_to_seclevel(auth); |
946 | if (sec_level > conn->hcon->pending_sec_level) | |
947 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 948 | |
2ed8f65c JH |
949 | /* If we need MITM check that it can be acheived */ |
950 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
951 | u8 method; | |
952 | ||
953 | method = get_auth_method(smp, conn->hcon->io_capability, | |
954 | req->io_capability); | |
955 | if (method == JUST_WORKS || method == JUST_CFM) | |
956 | return SMP_AUTH_REQUIREMENTS; | |
957 | } | |
958 | ||
2b64d153 | 959 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
960 | |
961 | key_size = min(req->max_key_size, rsp.max_key_size); | |
962 | if (check_enc_key_size(conn, key_size)) | |
963 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 964 | |
e84a6b13 | 965 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 966 | |
1c1def09 VCG |
967 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
968 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 969 | |
3158c50c | 970 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 971 | |
2b64d153 BG |
972 | /* Request setup of TK */ |
973 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
974 | if (ret) | |
975 | return SMP_UNSPECIFIED; | |
976 | ||
da85e5e5 | 977 | return 0; |
88ba43b6 AB |
978 | } |
979 | ||
da85e5e5 | 980 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 981 | { |
3158c50c | 982 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
983 | struct l2cap_chan *chan = conn->smp; |
984 | struct smp_chan *smp = chan->data; | |
2b64d153 | 985 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 986 | int ret; |
88ba43b6 AB |
987 | |
988 | BT_DBG("conn %p", conn); | |
989 | ||
c46b98be | 990 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 991 | return SMP_INVALID_PARAMS; |
c46b98be | 992 | |
40bef302 | 993 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
994 | return SMP_CMD_NOTSUPP; |
995 | ||
3158c50c VCG |
996 | skb_pull(skb, sizeof(*rsp)); |
997 | ||
1c1def09 | 998 | req = (void *) &smp->preq[1]; |
da85e5e5 | 999 | |
3158c50c VCG |
1000 | key_size = min(req->max_key_size, rsp->max_key_size); |
1001 | if (check_enc_key_size(conn, key_size)) | |
1002 | return SMP_ENC_KEY_SIZE; | |
1003 | ||
2ed8f65c JH |
1004 | /* If we need MITM check that it can be acheived */ |
1005 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
1006 | u8 method; | |
1007 | ||
1008 | method = get_auth_method(smp, req->io_capability, | |
1009 | rsp->io_capability); | |
1010 | if (method == JUST_WORKS || method == JUST_CFM) | |
1011 | return SMP_AUTH_REQUIREMENTS; | |
1012 | } | |
1013 | ||
e84a6b13 | 1014 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1015 | |
8aab4757 VCG |
1016 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1017 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 1018 | |
fdcc4bec JH |
1019 | /* Update remote key distribution in case the remote cleared |
1020 | * some bits that we had enabled in our request. | |
1021 | */ | |
1022 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1023 | ||
2b64d153 | 1024 | if ((req->auth_req & SMP_AUTH_BONDING) && |
f1560463 | 1025 | (rsp->auth_req & SMP_AUTH_BONDING)) |
2b64d153 BG |
1026 | auth = SMP_AUTH_BONDING; |
1027 | ||
1028 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
1029 | ||
476585ec | 1030 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1031 | if (ret) |
1032 | return SMP_UNSPECIFIED; | |
1033 | ||
4a74d658 | 1034 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1035 | |
1036 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1037 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1038 | return smp_confirm(smp); |
da85e5e5 VCG |
1039 | |
1040 | return 0; | |
88ba43b6 AB |
1041 | } |
1042 | ||
da85e5e5 | 1043 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1044 | { |
5d88cc73 JH |
1045 | struct l2cap_chan *chan = conn->smp; |
1046 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1047 | |
88ba43b6 AB |
1048 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
1049 | ||
c46b98be | 1050 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 1051 | return SMP_INVALID_PARAMS; |
c46b98be | 1052 | |
1c1def09 VCG |
1053 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
1054 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 1055 | |
943a732a JH |
1056 | if (conn->hcon->out) |
1057 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1058 | smp->prnd); | |
4a74d658 | 1059 | else if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1060 | return smp_confirm(smp); |
943a732a | 1061 | else |
4a74d658 | 1062 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
1063 | |
1064 | return 0; | |
88ba43b6 AB |
1065 | } |
1066 | ||
da85e5e5 | 1067 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1068 | { |
5d88cc73 JH |
1069 | struct l2cap_chan *chan = conn->smp; |
1070 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1071 | |
8aab4757 | 1072 | BT_DBG("conn %p", conn); |
3158c50c | 1073 | |
c46b98be | 1074 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 1075 | return SMP_INVALID_PARAMS; |
c46b98be | 1076 | |
943a732a | 1077 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 1078 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 1079 | |
861580a9 | 1080 | return smp_random(smp); |
88ba43b6 AB |
1081 | } |
1082 | ||
f81cd823 | 1083 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 1084 | { |
c9839a11 | 1085 | struct smp_ltk *key; |
988c5997 VCG |
1086 | struct hci_conn *hcon = conn->hcon; |
1087 | ||
98a0b845 | 1088 | key = hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, |
e804d25d | 1089 | hcon->role); |
988c5997 | 1090 | if (!key) |
f81cd823 | 1091 | return false; |
988c5997 | 1092 | |
4dab7864 | 1093 | if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) |
f81cd823 | 1094 | return false; |
4dab7864 | 1095 | |
51a8efd7 | 1096 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 1097 | return true; |
988c5997 | 1098 | |
c9839a11 VCG |
1099 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
1100 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 1101 | |
fe59a05f JH |
1102 | /* We never store STKs for master role, so clear this flag */ |
1103 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
1104 | ||
f81cd823 | 1105 | return true; |
988c5997 | 1106 | } |
f1560463 | 1107 | |
854f4727 JH |
1108 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level) |
1109 | { | |
1110 | if (sec_level == BT_SECURITY_LOW) | |
1111 | return true; | |
1112 | ||
9ab65d60 JH |
1113 | /* If we're encrypted with an STK always claim insufficient |
1114 | * security. This way we allow the connection to be re-encrypted | |
1115 | * with an LTK, even if the LTK provides the same level of | |
b2d5e254 JH |
1116 | * security. Only exception is if we don't have an LTK (e.g. |
1117 | * because of key distribution bits). | |
9ab65d60 | 1118 | */ |
b2d5e254 JH |
1119 | if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && |
1120 | hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, | |
e804d25d | 1121 | hcon->role)) |
9ab65d60 JH |
1122 | return false; |
1123 | ||
854f4727 JH |
1124 | if (hcon->sec_level >= sec_level) |
1125 | return true; | |
1126 | ||
1127 | return false; | |
1128 | } | |
1129 | ||
da85e5e5 | 1130 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
1131 | { |
1132 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
1133 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 1134 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 1135 | struct smp_chan *smp; |
c7262e71 | 1136 | u8 sec_level; |
88ba43b6 AB |
1137 | |
1138 | BT_DBG("conn %p", conn); | |
1139 | ||
c46b98be | 1140 | if (skb->len < sizeof(*rp)) |
38e4a915 | 1141 | return SMP_INVALID_PARAMS; |
c46b98be | 1142 | |
40bef302 | 1143 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
1144 | return SMP_CMD_NOTSUPP; |
1145 | ||
c7262e71 | 1146 | sec_level = authreq_to_seclevel(rp->auth_req); |
854f4727 JH |
1147 | if (smp_sufficient_security(hcon, sec_level)) |
1148 | return 0; | |
1149 | ||
c7262e71 JH |
1150 | if (sec_level > hcon->pending_sec_level) |
1151 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 1152 | |
4dab7864 | 1153 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
1154 | return 0; |
1155 | ||
51a8efd7 | 1156 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
da85e5e5 | 1157 | return 0; |
f1cb9af5 | 1158 | |
8aab4757 | 1159 | smp = smp_chan_create(conn); |
c29d2444 JH |
1160 | if (!smp) |
1161 | return SMP_UNSPECIFIED; | |
d26a2345 | 1162 | |
b6ae8457 | 1163 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
616d55be JH |
1164 | (rp->auth_req & SMP_AUTH_BONDING)) |
1165 | return SMP_PAIRING_NOTSUPP; | |
1166 | ||
88ba43b6 | 1167 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 1168 | |
da85e5e5 | 1169 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 1170 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 1171 | |
1c1def09 VCG |
1172 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1173 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1174 | |
88ba43b6 | 1175 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 1176 | |
da85e5e5 | 1177 | return 0; |
88ba43b6 AB |
1178 | } |
1179 | ||
cc110922 | 1180 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 1181 | { |
cc110922 | 1182 | struct l2cap_conn *conn = hcon->l2cap_data; |
0a66cf20 | 1183 | struct smp_chan *smp; |
2b64d153 | 1184 | __u8 authreq; |
eb492e01 | 1185 | |
3a0259bb VCG |
1186 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
1187 | ||
0a66cf20 JH |
1188 | /* This may be NULL if there's an unexpected disconnection */ |
1189 | if (!conn) | |
1190 | return 1; | |
1191 | ||
757aee0f | 1192 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
1193 | return 1; |
1194 | ||
ad32a2f5 | 1195 | if (smp_sufficient_security(hcon, sec_level)) |
eb492e01 | 1196 | return 1; |
f1cb9af5 | 1197 | |
c7262e71 JH |
1198 | if (sec_level > hcon->pending_sec_level) |
1199 | hcon->pending_sec_level = sec_level; | |
1200 | ||
40bef302 | 1201 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
1202 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
1203 | return 0; | |
d26a2345 | 1204 | |
51a8efd7 | 1205 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
1206 | return 0; |
1207 | ||
8aab4757 | 1208 | smp = smp_chan_create(conn); |
2b64d153 BG |
1209 | if (!smp) |
1210 | return 1; | |
1211 | ||
1212 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 1213 | |
79897d20 JH |
1214 | /* Require MITM if IO Capability allows or the security level |
1215 | * requires it. | |
2e233644 | 1216 | */ |
79897d20 | 1217 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 1218 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
1219 | authreq |= SMP_AUTH_MITM; |
1220 | ||
40bef302 | 1221 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 1222 | struct smp_cmd_pairing cp; |
f01ead31 | 1223 | |
2b64d153 | 1224 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
1225 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1226 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1227 | |
eb492e01 AB |
1228 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
1229 | } else { | |
1230 | struct smp_cmd_security_req cp; | |
2b64d153 | 1231 | cp.auth_req = authreq; |
eb492e01 AB |
1232 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
1233 | } | |
1234 | ||
4a74d658 | 1235 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
edca792c | 1236 | |
eb492e01 AB |
1237 | return 0; |
1238 | } | |
1239 | ||
7034b911 VCG |
1240 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1241 | { | |
16b90839 | 1242 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
1243 | struct l2cap_chan *chan = conn->smp; |
1244 | struct smp_chan *smp = chan->data; | |
16b90839 | 1245 | |
c46b98be JH |
1246 | BT_DBG("conn %p", conn); |
1247 | ||
1248 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1249 | return SMP_INVALID_PARAMS; |
c46b98be | 1250 | |
6131ddc8 JH |
1251 | /* Ignore this PDU if it wasn't requested */ |
1252 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1253 | return 0; | |
1254 | ||
16b90839 VCG |
1255 | skb_pull(skb, sizeof(*rp)); |
1256 | ||
1c1def09 | 1257 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1258 | |
7034b911 VCG |
1259 | return 0; |
1260 | } | |
1261 | ||
1262 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1263 | { | |
16b90839 | 1264 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
1265 | struct l2cap_chan *chan = conn->smp; |
1266 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
1267 | struct hci_dev *hdev = conn->hcon->hdev; |
1268 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1269 | struct smp_ltk *ltk; |
c9839a11 | 1270 | u8 authenticated; |
16b90839 | 1271 | |
c46b98be JH |
1272 | BT_DBG("conn %p", conn); |
1273 | ||
1274 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1275 | return SMP_INVALID_PARAMS; |
c46b98be | 1276 | |
6131ddc8 JH |
1277 | /* Ignore this PDU if it wasn't requested */ |
1278 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1279 | return 0; | |
1280 | ||
9747a9f3 JH |
1281 | /* Mark the information as received */ |
1282 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1283 | ||
16b90839 | 1284 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1285 | |
c9839a11 | 1286 | hci_dev_lock(hdev); |
ce39fb4e | 1287 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1288 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1289 | authenticated, smp->tk, smp->enc_key_size, |
1290 | rp->ediv, rp->rand); | |
1291 | smp->ltk = ltk; | |
fd349c02 | 1292 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) |
86d1407c | 1293 | queue_work(hdev->workqueue, &smp->distribute_work); |
c9839a11 | 1294 | hci_dev_unlock(hdev); |
7034b911 VCG |
1295 | |
1296 | return 0; | |
1297 | } | |
1298 | ||
fd349c02 JH |
1299 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1300 | { | |
1301 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
1302 | struct l2cap_chan *chan = conn->smp; |
1303 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1304 | |
1305 | BT_DBG(""); | |
1306 | ||
1307 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1308 | return SMP_INVALID_PARAMS; |
fd349c02 | 1309 | |
6131ddc8 JH |
1310 | /* Ignore this PDU if it wasn't requested */ |
1311 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1312 | return 0; | |
1313 | ||
fd349c02 JH |
1314 | skb_pull(skb, sizeof(*info)); |
1315 | ||
1316 | memcpy(smp->irk, info->irk, 16); | |
1317 | ||
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1322 | struct sk_buff *skb) | |
1323 | { | |
1324 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
1325 | struct l2cap_chan *chan = conn->smp; |
1326 | struct smp_chan *smp = chan->data; | |
fd349c02 | 1327 | struct hci_conn *hcon = conn->hcon; |
86d1407c | 1328 | struct hci_dev *hdev = hcon->hdev; |
fd349c02 JH |
1329 | bdaddr_t rpa; |
1330 | ||
1331 | BT_DBG(""); | |
1332 | ||
1333 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1334 | return SMP_INVALID_PARAMS; |
fd349c02 | 1335 | |
6131ddc8 JH |
1336 | /* Ignore this PDU if it wasn't requested */ |
1337 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1338 | return 0; | |
1339 | ||
9747a9f3 JH |
1340 | /* Mark the information as received */ |
1341 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1342 | ||
fd349c02 JH |
1343 | skb_pull(skb, sizeof(*info)); |
1344 | ||
31dd624e JH |
1345 | hci_dev_lock(hcon->hdev); |
1346 | ||
a9a58f86 JH |
1347 | /* Strictly speaking the Core Specification (4.1) allows sending |
1348 | * an empty address which would force us to rely on just the IRK | |
1349 | * as "identity information". However, since such | |
1350 | * implementations are not known of and in order to not over | |
1351 | * complicate our implementation, simply pretend that we never | |
1352 | * received an IRK for such a device. | |
1353 | */ | |
1354 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1355 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1356 | goto distribute; |
a9a58f86 JH |
1357 | } |
1358 | ||
fd349c02 JH |
1359 | bacpy(&smp->id_addr, &info->bdaddr); |
1360 | smp->id_addr_type = info->addr_type; | |
1361 | ||
1362 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1363 | bacpy(&rpa, &hcon->dst); | |
1364 | else | |
1365 | bacpy(&rpa, BDADDR_ANY); | |
1366 | ||
23d0e128 JH |
1367 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1368 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1369 | |
31dd624e | 1370 | distribute: |
86d1407c | 1371 | queue_work(hdev->workqueue, &smp->distribute_work); |
fd349c02 | 1372 | |
31dd624e JH |
1373 | hci_dev_unlock(hcon->hdev); |
1374 | ||
fd349c02 JH |
1375 | return 0; |
1376 | } | |
1377 | ||
7ee4ea36 MH |
1378 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1379 | { | |
1380 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
1381 | struct l2cap_chan *chan = conn->smp; |
1382 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
1383 | struct hci_dev *hdev = conn->hcon->hdev; |
1384 | struct smp_csrk *csrk; | |
1385 | ||
1386 | BT_DBG("conn %p", conn); | |
1387 | ||
1388 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1389 | return SMP_INVALID_PARAMS; |
7ee4ea36 MH |
1390 | |
1391 | /* Ignore this PDU if it wasn't requested */ | |
1392 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1393 | return 0; | |
1394 | ||
1395 | /* Mark the information as received */ | |
1396 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1397 | ||
1398 | skb_pull(skb, sizeof(*rp)); | |
1399 | ||
1400 | hci_dev_lock(hdev); | |
1401 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1402 | if (csrk) { | |
1403 | csrk->master = 0x01; | |
1404 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1405 | } | |
1406 | smp->csrk = csrk; | |
86d1407c | 1407 | queue_work(hdev->workqueue, &smp->distribute_work); |
7ee4ea36 MH |
1408 | hci_dev_unlock(hdev); |
1409 | ||
1410 | return 0; | |
1411 | } | |
1412 | ||
4befb867 | 1413 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 1414 | { |
5d88cc73 | 1415 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 1416 | struct hci_conn *hcon = conn->hcon; |
92381f5c | 1417 | __u8 code, reason; |
eb492e01 AB |
1418 | int err = 0; |
1419 | ||
7b9899db MH |
1420 | if (hcon->type != LE_LINK) { |
1421 | kfree_skb(skb); | |
3432711f | 1422 | return 0; |
7b9899db MH |
1423 | } |
1424 | ||
8ae9b984 | 1425 | if (skb->len < 1) |
92381f5c | 1426 | return -EILSEQ; |
92381f5c | 1427 | |
06ae3314 | 1428 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1429 | reason = SMP_PAIRING_NOTSUPP; |
1430 | goto done; | |
1431 | } | |
1432 | ||
92381f5c | 1433 | code = skb->data[0]; |
eb492e01 AB |
1434 | skb_pull(skb, sizeof(code)); |
1435 | ||
8cf9fa12 JH |
1436 | /* |
1437 | * The SMP context must be initialized for all other PDUs except | |
1438 | * pairing and security requests. If we get any other PDU when | |
1439 | * not initialized simply disconnect (done if this function | |
1440 | * returns an error). | |
1441 | */ | |
1442 | if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && | |
d3368605 | 1443 | !test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
8cf9fa12 | 1444 | BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); |
8ae9b984 JH |
1445 | err = -EOPNOTSUPP; |
1446 | goto done; | |
8cf9fa12 JH |
1447 | } |
1448 | ||
eb492e01 AB |
1449 | switch (code) { |
1450 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1451 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1452 | break; |
1453 | ||
1454 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1455 | smp_failure(conn, 0); |
da85e5e5 | 1456 | err = -EPERM; |
eb492e01 AB |
1457 | break; |
1458 | ||
1459 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1460 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1461 | break; |
1462 | ||
1463 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1464 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1465 | break; |
1466 | ||
eb492e01 | 1467 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1468 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1469 | break; |
1470 | ||
eb492e01 | 1471 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1472 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1473 | break; |
1474 | ||
eb492e01 | 1475 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1476 | reason = smp_cmd_encrypt_info(conn, skb); |
1477 | break; | |
1478 | ||
eb492e01 | 1479 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1480 | reason = smp_cmd_master_ident(conn, skb); |
1481 | break; | |
1482 | ||
eb492e01 | 1483 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1484 | reason = smp_cmd_ident_info(conn, skb); |
1485 | break; | |
1486 | ||
eb492e01 | 1487 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1488 | reason = smp_cmd_ident_addr_info(conn, skb); |
1489 | break; | |
1490 | ||
eb492e01 | 1491 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1492 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1493 | break; |
1494 | ||
eb492e01 AB |
1495 | default: |
1496 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 1497 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 1498 | goto done; |
eb492e01 AB |
1499 | } |
1500 | ||
3a0259bb | 1501 | done: |
9b7b18ef JH |
1502 | if (!err) { |
1503 | if (reason) | |
1504 | smp_failure(conn, reason); | |
8ae9b984 | 1505 | kfree_skb(skb); |
9b7b18ef JH |
1506 | } |
1507 | ||
eb492e01 AB |
1508 | return err; |
1509 | } | |
7034b911 | 1510 | |
70db83c4 JH |
1511 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
1512 | { | |
1513 | struct l2cap_conn *conn = chan->conn; | |
1514 | ||
1515 | BT_DBG("chan %p", chan); | |
1516 | ||
109ec230 | 1517 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
5d88cc73 | 1518 | smp_chan_destroy(conn); |
5d88cc73 | 1519 | |
70db83c4 JH |
1520 | conn->smp = NULL; |
1521 | l2cap_chan_put(chan); | |
1522 | } | |
1523 | ||
44f1a7ab JH |
1524 | static void smp_resume_cb(struct l2cap_chan *chan) |
1525 | { | |
b68fda68 | 1526 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
1527 | struct l2cap_conn *conn = chan->conn; |
1528 | struct hci_conn *hcon = conn->hcon; | |
86d1407c | 1529 | struct hci_dev *hdev = hcon->hdev; |
44f1a7ab JH |
1530 | |
1531 | BT_DBG("chan %p", chan); | |
1532 | ||
86d1407c JH |
1533 | if (!smp) |
1534 | return; | |
b68fda68 | 1535 | |
84bc0db5 JH |
1536 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
1537 | return; | |
1538 | ||
86d1407c JH |
1539 | cancel_delayed_work(&smp->security_timer); |
1540 | ||
84bc0db5 | 1541 | queue_work(hdev->workqueue, &smp->distribute_work); |
44f1a7ab JH |
1542 | } |
1543 | ||
70db83c4 JH |
1544 | static void smp_ready_cb(struct l2cap_chan *chan) |
1545 | { | |
1546 | struct l2cap_conn *conn = chan->conn; | |
1547 | ||
1548 | BT_DBG("chan %p", chan); | |
1549 | ||
1550 | conn->smp = chan; | |
1551 | l2cap_chan_hold(chan); | |
1552 | } | |
1553 | ||
4befb867 JH |
1554 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
1555 | { | |
1556 | int err; | |
1557 | ||
1558 | BT_DBG("chan %p", chan); | |
1559 | ||
1560 | err = smp_sig_channel(chan, skb); | |
1561 | if (err) { | |
b68fda68 | 1562 | struct smp_chan *smp = chan->data; |
4befb867 | 1563 | |
b68fda68 JH |
1564 | if (smp) |
1565 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 1566 | |
1e91c29e | 1567 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
1568 | } |
1569 | ||
1570 | return err; | |
1571 | } | |
1572 | ||
70db83c4 JH |
1573 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
1574 | unsigned long hdr_len, | |
1575 | unsigned long len, int nb) | |
1576 | { | |
1577 | struct sk_buff *skb; | |
1578 | ||
1579 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
1580 | if (!skb) | |
1581 | return ERR_PTR(-ENOMEM); | |
1582 | ||
1583 | skb->priority = HCI_PRIO_MAX; | |
1584 | bt_cb(skb)->chan = chan; | |
1585 | ||
1586 | return skb; | |
1587 | } | |
1588 | ||
1589 | static const struct l2cap_ops smp_chan_ops = { | |
1590 | .name = "Security Manager", | |
1591 | .ready = smp_ready_cb, | |
5d88cc73 | 1592 | .recv = smp_recv_cb, |
70db83c4 JH |
1593 | .alloc_skb = smp_alloc_skb_cb, |
1594 | .teardown = smp_teardown_cb, | |
44f1a7ab | 1595 | .resume = smp_resume_cb, |
70db83c4 JH |
1596 | |
1597 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
1598 | .state_change = l2cap_chan_no_state_change, |
1599 | .close = l2cap_chan_no_close, | |
1600 | .defer = l2cap_chan_no_defer, | |
1601 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
1602 | .set_shutdown = l2cap_chan_no_set_shutdown, |
1603 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1604 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1605 | }; | |
1606 | ||
1607 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
1608 | { | |
1609 | struct l2cap_chan *chan; | |
1610 | ||
1611 | BT_DBG("pchan %p", pchan); | |
1612 | ||
1613 | chan = l2cap_chan_create(); | |
1614 | if (!chan) | |
1615 | return NULL; | |
1616 | ||
1617 | chan->chan_type = pchan->chan_type; | |
1618 | chan->ops = &smp_chan_ops; | |
1619 | chan->scid = pchan->scid; | |
1620 | chan->dcid = chan->scid; | |
1621 | chan->imtu = pchan->imtu; | |
1622 | chan->omtu = pchan->omtu; | |
1623 | chan->mode = pchan->mode; | |
1624 | ||
1625 | BT_DBG("created chan %p", chan); | |
1626 | ||
1627 | return chan; | |
1628 | } | |
1629 | ||
1630 | static const struct l2cap_ops smp_root_chan_ops = { | |
1631 | .name = "Security Manager Root", | |
1632 | .new_connection = smp_new_conn_cb, | |
1633 | ||
1634 | /* None of these are implemented for the root channel */ | |
1635 | .close = l2cap_chan_no_close, | |
1636 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
1637 | .recv = l2cap_chan_no_recv, | |
1638 | .state_change = l2cap_chan_no_state_change, | |
1639 | .teardown = l2cap_chan_no_teardown, | |
1640 | .ready = l2cap_chan_no_ready, | |
1641 | .defer = l2cap_chan_no_defer, | |
1642 | .suspend = l2cap_chan_no_suspend, | |
1643 | .resume = l2cap_chan_no_resume, | |
1644 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1645 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1646 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1647 | }; | |
1648 | ||
711eafe3 JH |
1649 | int smp_register(struct hci_dev *hdev) |
1650 | { | |
70db83c4 | 1651 | struct l2cap_chan *chan; |
defce9e8 | 1652 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 1653 | |
711eafe3 JH |
1654 | BT_DBG("%s", hdev->name); |
1655 | ||
defce9e8 JH |
1656 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
1657 | if (IS_ERR(tfm_aes)) { | |
1658 | int err = PTR_ERR(tfm_aes); | |
711eafe3 | 1659 | BT_ERR("Unable to create crypto context"); |
711eafe3 JH |
1660 | return err; |
1661 | } | |
1662 | ||
70db83c4 JH |
1663 | chan = l2cap_chan_create(); |
1664 | if (!chan) { | |
defce9e8 | 1665 | crypto_free_blkcipher(tfm_aes); |
70db83c4 JH |
1666 | return -ENOMEM; |
1667 | } | |
1668 | ||
defce9e8 JH |
1669 | chan->data = tfm_aes; |
1670 | ||
5d88cc73 | 1671 | l2cap_add_scid(chan, L2CAP_CID_SMP); |
70db83c4 JH |
1672 | |
1673 | l2cap_chan_set_defaults(chan); | |
1674 | ||
1675 | bacpy(&chan->src, &hdev->bdaddr); | |
1676 | chan->src_type = BDADDR_LE_PUBLIC; | |
1677 | chan->state = BT_LISTEN; | |
1678 | chan->mode = L2CAP_MODE_BASIC; | |
1679 | chan->imtu = L2CAP_DEFAULT_MTU; | |
1680 | chan->ops = &smp_root_chan_ops; | |
1681 | ||
1682 | hdev->smp_data = chan; | |
1683 | ||
711eafe3 JH |
1684 | return 0; |
1685 | } | |
1686 | ||
1687 | void smp_unregister(struct hci_dev *hdev) | |
1688 | { | |
70db83c4 | 1689 | struct l2cap_chan *chan = hdev->smp_data; |
defce9e8 | 1690 | struct crypto_blkcipher *tfm_aes; |
70db83c4 JH |
1691 | |
1692 | if (!chan) | |
1693 | return; | |
1694 | ||
1695 | BT_DBG("%s chan %p", hdev->name, chan); | |
711eafe3 | 1696 | |
defce9e8 JH |
1697 | tfm_aes = chan->data; |
1698 | if (tfm_aes) { | |
1699 | chan->data = NULL; | |
1700 | crypto_free_blkcipher(tfm_aes); | |
711eafe3 | 1701 | } |
70db83c4 JH |
1702 | |
1703 | hdev->smp_data = NULL; | |
1704 | l2cap_chan_put(chan); | |
711eafe3 | 1705 | } |