Commit | Line | Data |
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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 | 31 | |
3b19146d | 32 | #include "ecc.h" |
ac4b7236 | 33 | #include "smp.h" |
d22ef0bc | 34 | |
b28b4943 | 35 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 36 | |
3b19146d JH |
37 | /* Keys which are not distributed with Secure Connections */ |
38 | #define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY); | |
39 | ||
17b02e62 | 40 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 41 | |
0edb14de JH |
42 | #define AUTH_REQ_MASK(dev) (test_bit(HCI_SC_ENABLED, &(dev)->dev_flags) ? \ |
43 | 0x1f : 0x07) | |
44 | #define KEY_DIST_MASK 0x07 | |
065a13e2 | 45 | |
533e35d4 JH |
46 | enum { |
47 | SMP_FLAG_TK_VALID, | |
48 | SMP_FLAG_CFM_PENDING, | |
49 | SMP_FLAG_MITM_AUTH, | |
50 | SMP_FLAG_COMPLETE, | |
51 | SMP_FLAG_INITIATOR, | |
65668776 | 52 | SMP_FLAG_SC, |
533e35d4 | 53 | }; |
4bc58f51 JH |
54 | |
55 | struct smp_chan { | |
b68fda68 JH |
56 | struct l2cap_conn *conn; |
57 | struct delayed_work security_timer; | |
b28b4943 | 58 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 59 | |
4bc58f51 JH |
60 | u8 preq[7]; /* SMP Pairing Request */ |
61 | u8 prsp[7]; /* SMP Pairing Response */ | |
62 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
63 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
64 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
65 | u8 tk[16]; /* SMP Temporary Key */ | |
66 | u8 enc_key_size; | |
67 | u8 remote_key_dist; | |
68 | bdaddr_t id_addr; | |
69 | u8 id_addr_type; | |
70 | u8 irk[16]; | |
71 | struct smp_csrk *csrk; | |
72 | struct smp_csrk *slave_csrk; | |
73 | struct smp_ltk *ltk; | |
74 | struct smp_ltk *slave_ltk; | |
75 | struct smp_irk *remote_irk; | |
4a74d658 | 76 | unsigned long flags; |
6a7bd103 | 77 | |
3b19146d JH |
78 | /* Secure Connections variables */ |
79 | u8 local_pk[64]; | |
80 | u8 local_sk[32]; | |
81 | ||
6a7bd103 | 82 | struct crypto_blkcipher *tfm_aes; |
407cecf6 | 83 | struct crypto_hash *tfm_cmac; |
4bc58f51 JH |
84 | }; |
85 | ||
8a2936f4 | 86 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 87 | { |
8a2936f4 | 88 | size_t i; |
d22ef0bc | 89 | |
8a2936f4 JH |
90 | for (i = 0; i < len; i++) |
91 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
92 | } |
93 | ||
94 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
95 | { | |
96 | struct blkcipher_desc desc; | |
97 | struct scatterlist sg; | |
943a732a | 98 | uint8_t tmp[16], data[16]; |
201a5929 | 99 | int err; |
d22ef0bc AB |
100 | |
101 | if (tfm == NULL) { | |
102 | BT_ERR("tfm %p", tfm); | |
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | desc.tfm = tfm; | |
107 | desc.flags = 0; | |
108 | ||
943a732a | 109 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 110 | swap_buf(k, tmp, 16); |
943a732a JH |
111 | |
112 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
113 | if (err) { |
114 | BT_ERR("cipher setkey failed: %d", err); | |
115 | return err; | |
116 | } | |
117 | ||
943a732a | 118 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 119 | swap_buf(r, data, 16); |
943a732a JH |
120 | |
121 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 122 | |
d22ef0bc AB |
123 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
124 | if (err) | |
125 | BT_ERR("Encrypt data error %d", err); | |
126 | ||
943a732a | 127 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 128 | swap_buf(data, r, 16); |
943a732a | 129 | |
d22ef0bc AB |
130 | return err; |
131 | } | |
132 | ||
60478054 JH |
133 | static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3]) |
134 | { | |
943a732a | 135 | u8 _res[16]; |
60478054 JH |
136 | int err; |
137 | ||
138 | /* r' = padding || r */ | |
943a732a JH |
139 | memcpy(_res, r, 3); |
140 | memset(_res + 3, 0, 13); | |
60478054 | 141 | |
943a732a | 142 | err = smp_e(tfm, irk, _res); |
60478054 JH |
143 | if (err) { |
144 | BT_ERR("Encrypt error"); | |
145 | return err; | |
146 | } | |
147 | ||
148 | /* The output of the random address function ah is: | |
149 | * ah(h, r) = e(k, r') mod 2^24 | |
150 | * The output of the security function e is then truncated to 24 bits | |
151 | * by taking the least significant 24 bits of the output of e as the | |
152 | * result of ah. | |
153 | */ | |
943a732a | 154 | memcpy(res, _res, 3); |
60478054 JH |
155 | |
156 | return 0; | |
157 | } | |
158 | ||
defce9e8 | 159 | bool smp_irk_matches(struct hci_dev *hdev, u8 irk[16], bdaddr_t *bdaddr) |
60478054 | 160 | { |
defce9e8 JH |
161 | struct l2cap_chan *chan = hdev->smp_data; |
162 | struct crypto_blkcipher *tfm; | |
60478054 JH |
163 | u8 hash[3]; |
164 | int err; | |
165 | ||
defce9e8 JH |
166 | if (!chan || !chan->data) |
167 | return false; | |
168 | ||
169 | tfm = chan->data; | |
170 | ||
60478054 JH |
171 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
172 | ||
173 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
174 | if (err) | |
175 | return false; | |
176 | ||
177 | return !memcmp(bdaddr->b, hash, 3); | |
178 | } | |
179 | ||
defce9e8 | 180 | int smp_generate_rpa(struct hci_dev *hdev, u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 181 | { |
defce9e8 JH |
182 | struct l2cap_chan *chan = hdev->smp_data; |
183 | struct crypto_blkcipher *tfm; | |
b1e2b3ae JH |
184 | int err; |
185 | ||
defce9e8 JH |
186 | if (!chan || !chan->data) |
187 | return -EOPNOTSUPP; | |
188 | ||
189 | tfm = chan->data; | |
190 | ||
b1e2b3ae JH |
191 | get_random_bytes(&rpa->b[3], 3); |
192 | ||
193 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
194 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
195 | ||
196 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
197 | if (err < 0) | |
198 | return err; | |
199 | ||
200 | BT_DBG("RPA %pMR", rpa); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
e491eaf3 JH |
205 | static int smp_c1(struct crypto_blkcipher *tfm_aes, u8 k[16], u8 r[16], |
206 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, u8 _rat, | |
207 | bdaddr_t *ra, u8 res[16]) | |
d22ef0bc AB |
208 | { |
209 | u8 p1[16], p2[16]; | |
210 | int err; | |
211 | ||
212 | memset(p1, 0, 16); | |
213 | ||
214 | /* p1 = pres || preq || _rat || _iat */ | |
943a732a JH |
215 | p1[0] = _iat; |
216 | p1[1] = _rat; | |
217 | memcpy(p1 + 2, preq, 7); | |
218 | memcpy(p1 + 9, pres, 7); | |
d22ef0bc AB |
219 | |
220 | /* p2 = padding || ia || ra */ | |
943a732a JH |
221 | memcpy(p2, ra, 6); |
222 | memcpy(p2 + 6, ia, 6); | |
223 | memset(p2 + 12, 0, 4); | |
d22ef0bc AB |
224 | |
225 | /* res = r XOR p1 */ | |
226 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
227 | ||
228 | /* res = e(k, res) */ | |
e491eaf3 | 229 | err = smp_e(tfm_aes, k, res); |
d22ef0bc AB |
230 | if (err) { |
231 | BT_ERR("Encrypt data error"); | |
232 | return err; | |
233 | } | |
234 | ||
235 | /* res = res XOR p2 */ | |
236 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
237 | ||
238 | /* res = e(k, res) */ | |
e491eaf3 | 239 | err = smp_e(tfm_aes, k, res); |
d22ef0bc AB |
240 | if (err) |
241 | BT_ERR("Encrypt data error"); | |
242 | ||
243 | return err; | |
244 | } | |
245 | ||
e491eaf3 JH |
246 | static int smp_s1(struct crypto_blkcipher *tfm_aes, u8 k[16], u8 r1[16], |
247 | u8 r2[16], u8 _r[16]) | |
d22ef0bc AB |
248 | { |
249 | int err; | |
250 | ||
251 | /* Just least significant octets from r1 and r2 are considered */ | |
943a732a JH |
252 | memcpy(_r, r2, 8); |
253 | memcpy(_r + 8, r1, 8); | |
d22ef0bc | 254 | |
e491eaf3 | 255 | err = smp_e(tfm_aes, k, _r); |
d22ef0bc AB |
256 | if (err) |
257 | BT_ERR("Encrypt data error"); | |
258 | ||
259 | return err; | |
260 | } | |
261 | ||
5d88cc73 | 262 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 263 | { |
5d88cc73 | 264 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 265 | struct smp_chan *smp; |
5d88cc73 JH |
266 | struct kvec iv[2]; |
267 | struct msghdr msg; | |
eb492e01 | 268 | |
5d88cc73 JH |
269 | if (!chan) |
270 | return; | |
eb492e01 | 271 | |
5d88cc73 | 272 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 273 | |
5d88cc73 JH |
274 | iv[0].iov_base = &code; |
275 | iv[0].iov_len = 1; | |
eb492e01 | 276 | |
5d88cc73 JH |
277 | iv[1].iov_base = data; |
278 | iv[1].iov_len = len; | |
eb492e01 | 279 | |
5d88cc73 | 280 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 281 | |
5d88cc73 JH |
282 | msg.msg_iov = (struct iovec *) &iv; |
283 | msg.msg_iovlen = 2; | |
eb492e01 | 284 | |
5d88cc73 | 285 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 286 | |
b68fda68 JH |
287 | if (!chan->data) |
288 | return; | |
289 | ||
290 | smp = chan->data; | |
291 | ||
292 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 293 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
294 | } |
295 | ||
d2eb9e10 | 296 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 297 | { |
d2eb9e10 JH |
298 | if (authreq & SMP_AUTH_MITM) { |
299 | if (authreq & SMP_AUTH_SC) | |
300 | return BT_SECURITY_FIPS; | |
301 | else | |
302 | return BT_SECURITY_HIGH; | |
303 | } else { | |
2b64d153 | 304 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 305 | } |
2b64d153 BG |
306 | } |
307 | ||
308 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
309 | { | |
310 | switch (sec_level) { | |
d2eb9e10 | 311 | case BT_SECURITY_FIPS: |
2b64d153 BG |
312 | case BT_SECURITY_HIGH: |
313 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
314 | case BT_SECURITY_MEDIUM: | |
315 | return SMP_AUTH_BONDING; | |
316 | default: | |
317 | return SMP_AUTH_NONE; | |
318 | } | |
319 | } | |
320 | ||
b8e66eac | 321 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
322 | struct smp_cmd_pairing *req, |
323 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 324 | { |
5d88cc73 JH |
325 | struct l2cap_chan *chan = conn->smp; |
326 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
327 | struct hci_conn *hcon = conn->hcon; |
328 | struct hci_dev *hdev = hcon->hdev; | |
329 | u8 local_dist = 0, remote_dist = 0; | |
54790f73 | 330 | |
b6ae8457 | 331 | if (test_bit(HCI_BONDABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
332 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
333 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 334 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
335 | } else { |
336 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
337 | } |
338 | ||
fd349c02 JH |
339 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
340 | remote_dist |= SMP_DIST_ID_KEY; | |
341 | ||
863efaf2 JH |
342 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
343 | local_dist |= SMP_DIST_ID_KEY; | |
344 | ||
df8e1a4c JH |
345 | if (test_bit(HCI_SC_ENABLED, &hdev->dev_flags)) { |
346 | if ((authreq & SMP_AUTH_SC) && | |
347 | test_bit(HCI_SSP_ENABLED, &hdev->dev_flags)) { | |
348 | local_dist |= SMP_DIST_LINK_KEY; | |
349 | remote_dist |= SMP_DIST_LINK_KEY; | |
350 | } | |
351 | } else { | |
352 | authreq &= ~SMP_AUTH_SC; | |
353 | } | |
354 | ||
54790f73 VCG |
355 | if (rsp == NULL) { |
356 | req->io_capability = conn->hcon->io_capability; | |
357 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
358 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
359 | req->init_key_dist = local_dist; |
360 | req->resp_key_dist = remote_dist; | |
0edb14de | 361 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
362 | |
363 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
364 | return; |
365 | } | |
366 | ||
367 | rsp->io_capability = conn->hcon->io_capability; | |
368 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
369 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
370 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
371 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 372 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
373 | |
374 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
375 | } |
376 | ||
3158c50c VCG |
377 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
378 | { | |
5d88cc73 JH |
379 | struct l2cap_chan *chan = conn->smp; |
380 | struct smp_chan *smp = chan->data; | |
1c1def09 | 381 | |
3158c50c | 382 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 383 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
384 | return SMP_ENC_KEY_SIZE; |
385 | ||
f7aa611a | 386 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
387 | |
388 | return 0; | |
389 | } | |
390 | ||
6f48e260 JH |
391 | static void smp_chan_destroy(struct l2cap_conn *conn) |
392 | { | |
393 | struct l2cap_chan *chan = conn->smp; | |
394 | struct smp_chan *smp = chan->data; | |
395 | bool complete; | |
396 | ||
397 | BUG_ON(!smp); | |
398 | ||
399 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 400 | |
6f48e260 JH |
401 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
402 | mgmt_smp_complete(conn->hcon, complete); | |
403 | ||
404 | kfree(smp->csrk); | |
405 | kfree(smp->slave_csrk); | |
406 | ||
407 | crypto_free_blkcipher(smp->tfm_aes); | |
407cecf6 | 408 | crypto_free_hash(smp->tfm_cmac); |
6f48e260 JH |
409 | |
410 | /* If pairing failed clean up any keys we might have */ | |
411 | if (!complete) { | |
412 | if (smp->ltk) { | |
970d0f1b JH |
413 | list_del_rcu(&smp->ltk->list); |
414 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
415 | } |
416 | ||
417 | if (smp->slave_ltk) { | |
970d0f1b JH |
418 | list_del_rcu(&smp->slave_ltk->list); |
419 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
420 | } |
421 | ||
422 | if (smp->remote_irk) { | |
adae20cb JH |
423 | list_del_rcu(&smp->remote_irk->list); |
424 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
425 | } |
426 | } | |
427 | ||
428 | chan->data = NULL; | |
429 | kfree(smp); | |
430 | hci_conn_drop(conn->hcon); | |
431 | } | |
432 | ||
84794e11 | 433 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 434 | { |
bab73cb6 | 435 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 436 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 437 | |
84794e11 | 438 | if (reason) |
4f957a76 | 439 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 440 | &reason); |
4f957a76 | 441 | |
ce39fb4e | 442 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
e1e930f5 | 443 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 444 | |
fc75cc86 | 445 | if (chan->data) |
f1c09c07 | 446 | smp_chan_destroy(conn); |
4f957a76 BG |
447 | } |
448 | ||
2b64d153 BG |
449 | #define JUST_WORKS 0x00 |
450 | #define JUST_CFM 0x01 | |
451 | #define REQ_PASSKEY 0x02 | |
452 | #define CFM_PASSKEY 0x03 | |
453 | #define REQ_OOB 0x04 | |
454 | #define OVERLAP 0xFF | |
455 | ||
456 | static const u8 gen_method[5][5] = { | |
457 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
458 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
459 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
460 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
461 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
462 | }; | |
463 | ||
581370cc JH |
464 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
465 | { | |
2bcd4003 JH |
466 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
467 | * converted later to JUST_WORKS if we're initiators. | |
468 | */ | |
581370cc JH |
469 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
470 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 471 | return JUST_CFM; |
581370cc JH |
472 | |
473 | return gen_method[remote_io][local_io]; | |
474 | } | |
475 | ||
2b64d153 BG |
476 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
477 | u8 local_io, u8 remote_io) | |
478 | { | |
479 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
480 | struct l2cap_chan *chan = conn->smp; |
481 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
482 | u8 method; |
483 | u32 passkey = 0; | |
484 | int ret = 0; | |
485 | ||
486 | /* Initialize key for JUST WORKS */ | |
487 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 488 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
489 | |
490 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
491 | ||
2bcd4003 JH |
492 | /* If neither side wants MITM, either "just" confirm an incoming |
493 | * request or use just-works for outgoing ones. The JUST_CFM | |
494 | * will be converted to JUST_WORKS if necessary later in this | |
495 | * function. If either side has MITM look up the method from the | |
496 | * table. | |
497 | */ | |
581370cc | 498 | if (!(auth & SMP_AUTH_MITM)) |
2bcd4003 | 499 | method = JUST_CFM; |
2b64d153 | 500 | else |
581370cc | 501 | method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 502 | |
a82505c7 | 503 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 504 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
505 | method = JUST_WORKS; |
506 | ||
02f3e254 JH |
507 | /* Don't bother user space with no IO capabilities */ |
508 | if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
509 | method = JUST_WORKS; | |
510 | ||
2b64d153 BG |
511 | /* If Just Works, Continue with Zero TK */ |
512 | if (method == JUST_WORKS) { | |
4a74d658 | 513 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
514 | return 0; |
515 | } | |
516 | ||
517 | /* Not Just Works/Confirm results in MITM Authentication */ | |
5eb596f5 | 518 | if (method != JUST_CFM) { |
4a74d658 | 519 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
520 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
521 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
522 | } | |
2b64d153 BG |
523 | |
524 | /* If both devices have Keyoard-Display I/O, the master | |
525 | * Confirms and the slave Enters the passkey. | |
526 | */ | |
527 | if (method == OVERLAP) { | |
40bef302 | 528 | if (hcon->role == HCI_ROLE_MASTER) |
2b64d153 BG |
529 | method = CFM_PASSKEY; |
530 | else | |
531 | method = REQ_PASSKEY; | |
532 | } | |
533 | ||
01ad34d2 | 534 | /* Generate random passkey. */ |
2b64d153 | 535 | if (method == CFM_PASSKEY) { |
943a732a | 536 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
537 | get_random_bytes(&passkey, sizeof(passkey)); |
538 | passkey %= 1000000; | |
943a732a | 539 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 540 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 541 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
542 | } |
543 | ||
2b64d153 | 544 | if (method == REQ_PASSKEY) |
ce39fb4e | 545 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 546 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
547 | else if (method == JUST_CFM) |
548 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
549 | hcon->type, hcon->dst_type, | |
550 | passkey, 1); | |
2b64d153 | 551 | else |
01ad34d2 | 552 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 553 | hcon->type, hcon->dst_type, |
39adbffe | 554 | passkey, 0); |
2b64d153 | 555 | |
2b64d153 BG |
556 | return ret; |
557 | } | |
558 | ||
1cc61144 | 559 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 560 | { |
8aab4757 | 561 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
562 | struct smp_cmd_pairing_confirm cp; |
563 | int ret; | |
8aab4757 VCG |
564 | |
565 | BT_DBG("conn %p", conn); | |
566 | ||
e491eaf3 | 567 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 568 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
569 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
570 | cp.confirm_val); | |
1cc61144 JH |
571 | if (ret) |
572 | return SMP_UNSPECIFIED; | |
8aab4757 | 573 | |
4a74d658 | 574 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 575 | |
8aab4757 VCG |
576 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
577 | ||
b28b4943 JH |
578 | if (conn->hcon->out) |
579 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
580 | else | |
581 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
582 | ||
1cc61144 | 583 | return 0; |
8aab4757 VCG |
584 | } |
585 | ||
861580a9 | 586 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 587 | { |
8aab4757 VCG |
588 | struct l2cap_conn *conn = smp->conn; |
589 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 590 | u8 confirm[16]; |
8aab4757 VCG |
591 | int ret; |
592 | ||
ec70f36f | 593 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 594 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
595 | |
596 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
597 | ||
e491eaf3 | 598 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 599 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 600 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
601 | if (ret) |
602 | return SMP_UNSPECIFIED; | |
8aab4757 | 603 | |
8aab4757 VCG |
604 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
605 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 606 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
607 | } |
608 | ||
609 | if (hcon->out) { | |
fe39c7b2 MH |
610 | u8 stk[16]; |
611 | __le64 rand = 0; | |
612 | __le16 ediv = 0; | |
8aab4757 | 613 | |
e491eaf3 | 614 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 615 | |
f7aa611a | 616 | memset(stk + smp->enc_key_size, 0, |
04124681 | 617 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 618 | |
861580a9 JH |
619 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
620 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
621 | |
622 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 623 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 624 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 625 | } else { |
fff3490f | 626 | u8 stk[16], auth; |
fe39c7b2 MH |
627 | __le64 rand = 0; |
628 | __le16 ediv = 0; | |
8aab4757 | 629 | |
943a732a JH |
630 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
631 | smp->prnd); | |
8aab4757 | 632 | |
e491eaf3 | 633 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 634 | |
f7aa611a | 635 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 636 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 637 | |
fff3490f JH |
638 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
639 | auth = 1; | |
640 | else | |
641 | auth = 0; | |
642 | ||
7d5843b7 JH |
643 | /* Even though there's no _SLAVE suffix this is the |
644 | * slave STK we're adding for later lookup (the master | |
645 | * STK never needs to be stored). | |
646 | */ | |
ce39fb4e | 647 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 648 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
649 | } |
650 | ||
861580a9 | 651 | return 0; |
8aab4757 VCG |
652 | } |
653 | ||
44f1a7ab JH |
654 | static void smp_notify_keys(struct l2cap_conn *conn) |
655 | { | |
656 | struct l2cap_chan *chan = conn->smp; | |
657 | struct smp_chan *smp = chan->data; | |
658 | struct hci_conn *hcon = conn->hcon; | |
659 | struct hci_dev *hdev = hcon->hdev; | |
660 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
661 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
662 | bool persistent; | |
663 | ||
664 | if (smp->remote_irk) { | |
665 | mgmt_new_irk(hdev, smp->remote_irk); | |
666 | /* Now that user space can be considered to know the | |
667 | * identity address track the connection based on it | |
668 | * from now on. | |
669 | */ | |
670 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
671 | hcon->dst_type = smp->remote_irk->addr_type; | |
f3d82d0c | 672 | queue_work(hdev->workqueue, &conn->id_addr_update_work); |
44f1a7ab JH |
673 | |
674 | /* When receiving an indentity resolving key for | |
675 | * a remote device that does not use a resolvable | |
676 | * private address, just remove the key so that | |
677 | * it is possible to use the controller white | |
678 | * list for scanning. | |
679 | * | |
680 | * Userspace will have been told to not store | |
681 | * this key at this point. So it is safe to | |
682 | * just remove it. | |
683 | */ | |
684 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
adae20cb JH |
685 | list_del_rcu(&smp->remote_irk->list); |
686 | kfree_rcu(smp->remote_irk, rcu); | |
44f1a7ab JH |
687 | smp->remote_irk = NULL; |
688 | } | |
689 | } | |
690 | ||
691 | /* The LTKs and CSRKs should be persistent only if both sides | |
692 | * had the bonding bit set in their authentication requests. | |
693 | */ | |
694 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
695 | ||
696 | if (smp->csrk) { | |
697 | smp->csrk->bdaddr_type = hcon->dst_type; | |
698 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
699 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
700 | } | |
701 | ||
702 | if (smp->slave_csrk) { | |
703 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
704 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
705 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
706 | } | |
707 | ||
708 | if (smp->ltk) { | |
709 | smp->ltk->bdaddr_type = hcon->dst_type; | |
710 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
711 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
712 | } | |
713 | ||
714 | if (smp->slave_ltk) { | |
715 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
716 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
717 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
718 | } | |
719 | } | |
720 | ||
b28b4943 JH |
721 | static void smp_allow_key_dist(struct smp_chan *smp) |
722 | { | |
723 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
724 | * will be allowed in each PDU handler to ensure we receive | |
725 | * them in the correct order. | |
726 | */ | |
727 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
728 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
729 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
730 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
731 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
732 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
733 | } | |
734 | ||
d6268e86 | 735 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
736 | { |
737 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 738 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
739 | struct hci_conn *hcon = conn->hcon; |
740 | struct hci_dev *hdev = hcon->hdev; | |
741 | __u8 *keydist; | |
742 | ||
743 | BT_DBG("conn %p", conn); | |
744 | ||
44f1a7ab JH |
745 | rsp = (void *) &smp->prsp[1]; |
746 | ||
747 | /* The responder sends its keys first */ | |
b28b4943 JH |
748 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
749 | smp_allow_key_dist(smp); | |
86d1407c | 750 | return; |
b28b4943 | 751 | } |
44f1a7ab JH |
752 | |
753 | req = (void *) &smp->preq[1]; | |
754 | ||
755 | if (hcon->out) { | |
756 | keydist = &rsp->init_key_dist; | |
757 | *keydist &= req->init_key_dist; | |
758 | } else { | |
759 | keydist = &rsp->resp_key_dist; | |
760 | *keydist &= req->resp_key_dist; | |
761 | } | |
762 | ||
763 | BT_DBG("keydist 0x%x", *keydist); | |
764 | ||
765 | if (*keydist & SMP_DIST_ENC_KEY) { | |
766 | struct smp_cmd_encrypt_info enc; | |
767 | struct smp_cmd_master_ident ident; | |
768 | struct smp_ltk *ltk; | |
769 | u8 authenticated; | |
770 | __le16 ediv; | |
771 | __le64 rand; | |
772 | ||
773 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
774 | get_random_bytes(&ediv, sizeof(ediv)); | |
775 | get_random_bytes(&rand, sizeof(rand)); | |
776 | ||
777 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
778 | ||
779 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
780 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
781 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
782 | smp->enc_key_size, ediv, rand); | |
783 | smp->slave_ltk = ltk; | |
784 | ||
785 | ident.ediv = ediv; | |
786 | ident.rand = rand; | |
787 | ||
788 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
789 | ||
790 | *keydist &= ~SMP_DIST_ENC_KEY; | |
791 | } | |
792 | ||
793 | if (*keydist & SMP_DIST_ID_KEY) { | |
794 | struct smp_cmd_ident_addr_info addrinfo; | |
795 | struct smp_cmd_ident_info idinfo; | |
796 | ||
797 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
798 | ||
799 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
800 | ||
801 | /* The hci_conn contains the local identity address | |
802 | * after the connection has been established. | |
803 | * | |
804 | * This is true even when the connection has been | |
805 | * established using a resolvable random address. | |
806 | */ | |
807 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
808 | addrinfo.addr_type = hcon->src_type; | |
809 | ||
810 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
811 | &addrinfo); | |
812 | ||
813 | *keydist &= ~SMP_DIST_ID_KEY; | |
814 | } | |
815 | ||
816 | if (*keydist & SMP_DIST_SIGN) { | |
817 | struct smp_cmd_sign_info sign; | |
818 | struct smp_csrk *csrk; | |
819 | ||
820 | /* Generate a new random key */ | |
821 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
822 | ||
823 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
824 | if (csrk) { | |
825 | csrk->master = 0x00; | |
826 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
827 | } | |
828 | smp->slave_csrk = csrk; | |
829 | ||
830 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
831 | ||
832 | *keydist &= ~SMP_DIST_SIGN; | |
833 | } | |
834 | ||
835 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
836 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
837 | smp_allow_key_dist(smp); | |
86d1407c | 838 | return; |
b28b4943 | 839 | } |
44f1a7ab | 840 | |
44f1a7ab JH |
841 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
842 | smp_notify_keys(conn); | |
843 | ||
844 | smp_chan_destroy(conn); | |
44f1a7ab JH |
845 | } |
846 | ||
b68fda68 JH |
847 | static void smp_timeout(struct work_struct *work) |
848 | { | |
849 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
850 | security_timer.work); | |
851 | struct l2cap_conn *conn = smp->conn; | |
852 | ||
853 | BT_DBG("conn %p", conn); | |
854 | ||
1e91c29e | 855 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
856 | } |
857 | ||
8aab4757 VCG |
858 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
859 | { | |
5d88cc73 | 860 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
861 | struct smp_chan *smp; |
862 | ||
f1560463 | 863 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 864 | if (!smp) |
8aab4757 VCG |
865 | return NULL; |
866 | ||
6a7bd103 JH |
867 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
868 | if (IS_ERR(smp->tfm_aes)) { | |
869 | BT_ERR("Unable to create ECB crypto context"); | |
870 | kfree(smp); | |
871 | return NULL; | |
872 | } | |
873 | ||
407cecf6 JH |
874 | smp->tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
875 | if (IS_ERR(smp->tfm_cmac)) { | |
876 | BT_ERR("Unable to create CMAC crypto context"); | |
877 | crypto_free_blkcipher(smp->tfm_aes); | |
878 | kfree(smp); | |
879 | return NULL; | |
880 | } | |
881 | ||
8aab4757 | 882 | smp->conn = conn; |
5d88cc73 | 883 | chan->data = smp; |
8aab4757 | 884 | |
b28b4943 JH |
885 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
886 | ||
b68fda68 JH |
887 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
888 | ||
8aab4757 VCG |
889 | hci_conn_hold(conn->hcon); |
890 | ||
891 | return smp; | |
892 | } | |
893 | ||
2b64d153 BG |
894 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
895 | { | |
b10e8017 | 896 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 897 | struct l2cap_chan *chan; |
2b64d153 BG |
898 | struct smp_chan *smp; |
899 | u32 value; | |
fc75cc86 | 900 | int err; |
2b64d153 BG |
901 | |
902 | BT_DBG(""); | |
903 | ||
fc75cc86 | 904 | if (!conn) |
2b64d153 BG |
905 | return -ENOTCONN; |
906 | ||
5d88cc73 JH |
907 | chan = conn->smp; |
908 | if (!chan) | |
909 | return -ENOTCONN; | |
910 | ||
fc75cc86 JH |
911 | l2cap_chan_lock(chan); |
912 | if (!chan->data) { | |
913 | err = -ENOTCONN; | |
914 | goto unlock; | |
915 | } | |
916 | ||
5d88cc73 | 917 | smp = chan->data; |
2b64d153 BG |
918 | |
919 | switch (mgmt_op) { | |
920 | case MGMT_OP_USER_PASSKEY_REPLY: | |
921 | value = le32_to_cpu(passkey); | |
943a732a | 922 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 923 | BT_DBG("PassKey: %d", value); |
943a732a | 924 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
925 | /* Fall Through */ |
926 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 927 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
928 | break; |
929 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
930 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 931 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
932 | err = 0; |
933 | goto unlock; | |
2b64d153 | 934 | default: |
84794e11 | 935 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
936 | err = -EOPNOTSUPP; |
937 | goto unlock; | |
2b64d153 BG |
938 | } |
939 | ||
fc75cc86 JH |
940 | err = 0; |
941 | ||
2b64d153 | 942 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
943 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
944 | u8 rsp = smp_confirm(smp); | |
945 | if (rsp) | |
946 | smp_failure(conn, rsp); | |
947 | } | |
2b64d153 | 948 | |
fc75cc86 JH |
949 | unlock: |
950 | l2cap_chan_unlock(chan); | |
951 | return err; | |
2b64d153 BG |
952 | } |
953 | ||
da85e5e5 | 954 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 955 | { |
3158c50c | 956 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 957 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 958 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 959 | struct smp_chan *smp; |
c7262e71 | 960 | u8 key_size, auth, sec_level; |
8aab4757 | 961 | int ret; |
88ba43b6 AB |
962 | |
963 | BT_DBG("conn %p", conn); | |
964 | ||
c46b98be | 965 | if (skb->len < sizeof(*req)) |
38e4a915 | 966 | return SMP_INVALID_PARAMS; |
c46b98be | 967 | |
40bef302 | 968 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
969 | return SMP_CMD_NOTSUPP; |
970 | ||
fc75cc86 | 971 | if (!chan->data) |
8aab4757 | 972 | smp = smp_chan_create(conn); |
fc75cc86 | 973 | else |
5d88cc73 | 974 | smp = chan->data; |
8aab4757 | 975 | |
d08fd0e7 AE |
976 | if (!smp) |
977 | return SMP_UNSPECIFIED; | |
d26a2345 | 978 | |
c05b9339 | 979 | /* We didn't start the pairing, so match remote */ |
0edb14de | 980 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 981 | |
b6ae8457 | 982 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
c05b9339 | 983 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
984 | return SMP_PAIRING_NOTSUPP; |
985 | ||
1c1def09 VCG |
986 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
987 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 988 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 989 | |
5be5e275 | 990 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
991 | sec_level = BT_SECURITY_MEDIUM; |
992 | else | |
993 | sec_level = authreq_to_seclevel(auth); | |
994 | ||
c7262e71 JH |
995 | if (sec_level > conn->hcon->pending_sec_level) |
996 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 997 | |
49c922bb | 998 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
999 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1000 | u8 method; | |
1001 | ||
1002 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1003 | req->io_capability); | |
1004 | if (method == JUST_WORKS || method == JUST_CFM) | |
1005 | return SMP_AUTH_REQUIREMENTS; | |
1006 | } | |
1007 | ||
2b64d153 | 1008 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c | 1009 | |
65668776 JH |
1010 | if (rsp.auth_req & SMP_AUTH_SC) |
1011 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1012 | ||
3158c50c VCG |
1013 | key_size = min(req->max_key_size, rsp.max_key_size); |
1014 | if (check_enc_key_size(conn, key_size)) | |
1015 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1016 | |
e84a6b13 | 1017 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1018 | |
1c1def09 VCG |
1019 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1020 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1021 | |
3158c50c | 1022 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1023 | |
1024 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1025 | ||
1026 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { | |
1027 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1028 | /* Clear bits which are generated but not distributed */ | |
1029 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1030 | /* Wait for Public Key from Initiating Device */ | |
1031 | return 0; | |
1032 | } else { | |
1033 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1034 | } | |
da85e5e5 | 1035 | |
2b64d153 BG |
1036 | /* Request setup of TK */ |
1037 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1038 | if (ret) | |
1039 | return SMP_UNSPECIFIED; | |
1040 | ||
da85e5e5 | 1041 | return 0; |
88ba43b6 AB |
1042 | } |
1043 | ||
3b19146d JH |
1044 | static u8 sc_send_public_key(struct smp_chan *smp) |
1045 | { | |
1046 | BT_DBG(""); | |
1047 | ||
1048 | /* Generate local key pair for Secure Connections */ | |
1049 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
1050 | return SMP_UNSPECIFIED; | |
1051 | ||
1052 | BT_DBG("Local Public Key X: %32phN", smp->local_pk); | |
1053 | BT_DBG("Local Public Key Y: %32phN", &smp->local_pk[32]); | |
1054 | BT_DBG("Local Private Key: %32phN", smp->local_sk); | |
1055 | ||
1056 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
da85e5e5 | 1061 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1062 | { |
3158c50c | 1063 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1064 | struct l2cap_chan *chan = conn->smp; |
1065 | struct smp_chan *smp = chan->data; | |
0edb14de | 1066 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1067 | u8 key_size, auth; |
7d24ddcc | 1068 | int ret; |
88ba43b6 AB |
1069 | |
1070 | BT_DBG("conn %p", conn); | |
1071 | ||
c46b98be | 1072 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1073 | return SMP_INVALID_PARAMS; |
c46b98be | 1074 | |
40bef302 | 1075 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1076 | return SMP_CMD_NOTSUPP; |
1077 | ||
3158c50c VCG |
1078 | skb_pull(skb, sizeof(*rsp)); |
1079 | ||
1c1def09 | 1080 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1081 | |
3158c50c VCG |
1082 | key_size = min(req->max_key_size, rsp->max_key_size); |
1083 | if (check_enc_key_size(conn, key_size)) | |
1084 | return SMP_ENC_KEY_SIZE; | |
1085 | ||
0edb14de | 1086 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1087 | |
65668776 JH |
1088 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1089 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1090 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1091 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1092 | |
49c922bb | 1093 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1094 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1095 | u8 method; | |
1096 | ||
1097 | method = get_auth_method(smp, req->io_capability, | |
1098 | rsp->io_capability); | |
1099 | if (method == JUST_WORKS || method == JUST_CFM) | |
1100 | return SMP_AUTH_REQUIREMENTS; | |
1101 | } | |
1102 | ||
e84a6b13 | 1103 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1104 | |
8aab4757 VCG |
1105 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1106 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 1107 | |
fdcc4bec JH |
1108 | /* Update remote key distribution in case the remote cleared |
1109 | * some bits that we had enabled in our request. | |
1110 | */ | |
1111 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1112 | ||
3b19146d JH |
1113 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1114 | /* Clear bits which are generated but not distributed */ | |
1115 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1116 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1117 | return sc_send_public_key(smp); | |
1118 | } | |
1119 | ||
c05b9339 | 1120 | auth |= req->auth_req; |
2b64d153 | 1121 | |
476585ec | 1122 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1123 | if (ret) |
1124 | return SMP_UNSPECIFIED; | |
1125 | ||
4a74d658 | 1126 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1127 | |
1128 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1129 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1130 | return smp_confirm(smp); |
da85e5e5 VCG |
1131 | |
1132 | return 0; | |
88ba43b6 AB |
1133 | } |
1134 | ||
da85e5e5 | 1135 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1136 | { |
5d88cc73 JH |
1137 | struct l2cap_chan *chan = conn->smp; |
1138 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1139 | |
88ba43b6 AB |
1140 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
1141 | ||
c46b98be | 1142 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 1143 | return SMP_INVALID_PARAMS; |
c46b98be | 1144 | |
1c1def09 VCG |
1145 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
1146 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 1147 | |
b28b4943 | 1148 | if (conn->hcon->out) { |
943a732a JH |
1149 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1150 | smp->prnd); | |
b28b4943 JH |
1151 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 1156 | return smp_confirm(smp); |
943a732a | 1157 | else |
4a74d658 | 1158 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
1159 | |
1160 | return 0; | |
88ba43b6 AB |
1161 | } |
1162 | ||
da85e5e5 | 1163 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1164 | { |
5d88cc73 JH |
1165 | struct l2cap_chan *chan = conn->smp; |
1166 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1167 | |
8aab4757 | 1168 | BT_DBG("conn %p", conn); |
3158c50c | 1169 | |
c46b98be | 1170 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 1171 | return SMP_INVALID_PARAMS; |
c46b98be | 1172 | |
943a732a | 1173 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 1174 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 1175 | |
861580a9 | 1176 | return smp_random(smp); |
88ba43b6 AB |
1177 | } |
1178 | ||
f81cd823 | 1179 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 1180 | { |
c9839a11 | 1181 | struct smp_ltk *key; |
988c5997 VCG |
1182 | struct hci_conn *hcon = conn->hcon; |
1183 | ||
f3a73d97 | 1184 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 1185 | if (!key) |
f81cd823 | 1186 | return false; |
988c5997 | 1187 | |
a6f7833c | 1188 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 1189 | return false; |
4dab7864 | 1190 | |
51a8efd7 | 1191 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 1192 | return true; |
988c5997 | 1193 | |
c9839a11 VCG |
1194 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
1195 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 1196 | |
fe59a05f JH |
1197 | /* We never store STKs for master role, so clear this flag */ |
1198 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
1199 | ||
f81cd823 | 1200 | return true; |
988c5997 | 1201 | } |
f1560463 | 1202 | |
35dc6f83 JH |
1203 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
1204 | enum smp_key_pref key_pref) | |
854f4727 JH |
1205 | { |
1206 | if (sec_level == BT_SECURITY_LOW) | |
1207 | return true; | |
1208 | ||
35dc6f83 JH |
1209 | /* If we're encrypted with an STK but the caller prefers using |
1210 | * LTK claim insufficient security. This way we allow the | |
1211 | * connection to be re-encrypted with an LTK, even if the LTK | |
1212 | * provides the same level of security. Only exception is if we | |
1213 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 1214 | */ |
35dc6f83 JH |
1215 | if (key_pref == SMP_USE_LTK && |
1216 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 1217 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
1218 | return false; |
1219 | ||
854f4727 JH |
1220 | if (hcon->sec_level >= sec_level) |
1221 | return true; | |
1222 | ||
1223 | return false; | |
1224 | } | |
1225 | ||
da85e5e5 | 1226 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
1227 | { |
1228 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
1229 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 1230 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 1231 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 1232 | struct smp_chan *smp; |
c05b9339 | 1233 | u8 sec_level, auth; |
88ba43b6 AB |
1234 | |
1235 | BT_DBG("conn %p", conn); | |
1236 | ||
c46b98be | 1237 | if (skb->len < sizeof(*rp)) |
38e4a915 | 1238 | return SMP_INVALID_PARAMS; |
c46b98be | 1239 | |
40bef302 | 1240 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
1241 | return SMP_CMD_NOTSUPP; |
1242 | ||
0edb14de | 1243 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1244 | |
5be5e275 | 1245 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1246 | sec_level = BT_SECURITY_MEDIUM; |
1247 | else | |
1248 | sec_level = authreq_to_seclevel(auth); | |
1249 | ||
35dc6f83 | 1250 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
854f4727 JH |
1251 | return 0; |
1252 | ||
c7262e71 JH |
1253 | if (sec_level > hcon->pending_sec_level) |
1254 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 1255 | |
4dab7864 | 1256 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
1257 | return 0; |
1258 | ||
8aab4757 | 1259 | smp = smp_chan_create(conn); |
c29d2444 JH |
1260 | if (!smp) |
1261 | return SMP_UNSPECIFIED; | |
d26a2345 | 1262 | |
b6ae8457 | 1263 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
c05b9339 | 1264 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
1265 | return SMP_PAIRING_NOTSUPP; |
1266 | ||
88ba43b6 | 1267 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 1268 | |
da85e5e5 | 1269 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 1270 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 1271 | |
1c1def09 VCG |
1272 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1273 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1274 | |
88ba43b6 | 1275 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 1276 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 1277 | |
da85e5e5 | 1278 | return 0; |
88ba43b6 AB |
1279 | } |
1280 | ||
cc110922 | 1281 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 1282 | { |
cc110922 | 1283 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 1284 | struct l2cap_chan *chan; |
0a66cf20 | 1285 | struct smp_chan *smp; |
2b64d153 | 1286 | __u8 authreq; |
fc75cc86 | 1287 | int ret; |
eb492e01 | 1288 | |
3a0259bb VCG |
1289 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
1290 | ||
0a66cf20 JH |
1291 | /* This may be NULL if there's an unexpected disconnection */ |
1292 | if (!conn) | |
1293 | return 1; | |
1294 | ||
c68b7f12 JH |
1295 | chan = conn->smp; |
1296 | ||
757aee0f | 1297 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
1298 | return 1; |
1299 | ||
35dc6f83 | 1300 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 1301 | return 1; |
f1cb9af5 | 1302 | |
c7262e71 JH |
1303 | if (sec_level > hcon->pending_sec_level) |
1304 | hcon->pending_sec_level = sec_level; | |
1305 | ||
40bef302 | 1306 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
1307 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
1308 | return 0; | |
d26a2345 | 1309 | |
fc75cc86 JH |
1310 | l2cap_chan_lock(chan); |
1311 | ||
1312 | /* If SMP is already in progress ignore this request */ | |
1313 | if (chan->data) { | |
1314 | ret = 0; | |
1315 | goto unlock; | |
1316 | } | |
d26a2345 | 1317 | |
8aab4757 | 1318 | smp = smp_chan_create(conn); |
fc75cc86 JH |
1319 | if (!smp) { |
1320 | ret = 1; | |
1321 | goto unlock; | |
1322 | } | |
2b64d153 BG |
1323 | |
1324 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 1325 | |
d2eb9e10 JH |
1326 | if (test_bit(HCI_SC_ENABLED, &hcon->hdev->dev_flags)) |
1327 | authreq |= SMP_AUTH_SC; | |
1328 | ||
79897d20 JH |
1329 | /* Require MITM if IO Capability allows or the security level |
1330 | * requires it. | |
2e233644 | 1331 | */ |
79897d20 | 1332 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 1333 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
1334 | authreq |= SMP_AUTH_MITM; |
1335 | ||
40bef302 | 1336 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 1337 | struct smp_cmd_pairing cp; |
f01ead31 | 1338 | |
2b64d153 | 1339 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
1340 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1341 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1342 | |
eb492e01 | 1343 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 1344 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
1345 | } else { |
1346 | struct smp_cmd_security_req cp; | |
2b64d153 | 1347 | cp.auth_req = authreq; |
eb492e01 | 1348 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 1349 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
1350 | } |
1351 | ||
4a74d658 | 1352 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 1353 | ret = 0; |
edca792c | 1354 | |
fc75cc86 JH |
1355 | unlock: |
1356 | l2cap_chan_unlock(chan); | |
1357 | return ret; | |
eb492e01 AB |
1358 | } |
1359 | ||
7034b911 VCG |
1360 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1361 | { | |
16b90839 | 1362 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
1363 | struct l2cap_chan *chan = conn->smp; |
1364 | struct smp_chan *smp = chan->data; | |
16b90839 | 1365 | |
c46b98be JH |
1366 | BT_DBG("conn %p", conn); |
1367 | ||
1368 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1369 | return SMP_INVALID_PARAMS; |
c46b98be | 1370 | |
b28b4943 | 1371 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 1372 | |
16b90839 VCG |
1373 | skb_pull(skb, sizeof(*rp)); |
1374 | ||
1c1def09 | 1375 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1376 | |
7034b911 VCG |
1377 | return 0; |
1378 | } | |
1379 | ||
1380 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1381 | { | |
16b90839 | 1382 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
1383 | struct l2cap_chan *chan = conn->smp; |
1384 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
1385 | struct hci_dev *hdev = conn->hcon->hdev; |
1386 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1387 | struct smp_ltk *ltk; |
c9839a11 | 1388 | u8 authenticated; |
16b90839 | 1389 | |
c46b98be JH |
1390 | BT_DBG("conn %p", conn); |
1391 | ||
1392 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1393 | return SMP_INVALID_PARAMS; |
c46b98be | 1394 | |
9747a9f3 JH |
1395 | /* Mark the information as received */ |
1396 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1397 | ||
b28b4943 JH |
1398 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
1399 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
1400 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
1401 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 1402 | |
16b90839 | 1403 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1404 | |
ce39fb4e | 1405 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1406 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1407 | authenticated, smp->tk, smp->enc_key_size, |
1408 | rp->ediv, rp->rand); | |
1409 | smp->ltk = ltk; | |
c6e81e9a | 1410 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 1411 | smp_distribute_keys(smp); |
7034b911 VCG |
1412 | |
1413 | return 0; | |
1414 | } | |
1415 | ||
fd349c02 JH |
1416 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1417 | { | |
1418 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
1419 | struct l2cap_chan *chan = conn->smp; |
1420 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1421 | |
1422 | BT_DBG(""); | |
1423 | ||
1424 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1425 | return SMP_INVALID_PARAMS; |
fd349c02 | 1426 | |
b28b4943 | 1427 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 1428 | |
fd349c02 JH |
1429 | skb_pull(skb, sizeof(*info)); |
1430 | ||
1431 | memcpy(smp->irk, info->irk, 16); | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1437 | struct sk_buff *skb) | |
1438 | { | |
1439 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
1440 | struct l2cap_chan *chan = conn->smp; |
1441 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1442 | struct hci_conn *hcon = conn->hcon; |
1443 | bdaddr_t rpa; | |
1444 | ||
1445 | BT_DBG(""); | |
1446 | ||
1447 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1448 | return SMP_INVALID_PARAMS; |
fd349c02 | 1449 | |
9747a9f3 JH |
1450 | /* Mark the information as received */ |
1451 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1452 | ||
b28b4943 JH |
1453 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
1454 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1455 | ||
fd349c02 JH |
1456 | skb_pull(skb, sizeof(*info)); |
1457 | ||
a9a58f86 JH |
1458 | /* Strictly speaking the Core Specification (4.1) allows sending |
1459 | * an empty address which would force us to rely on just the IRK | |
1460 | * as "identity information". However, since such | |
1461 | * implementations are not known of and in order to not over | |
1462 | * complicate our implementation, simply pretend that we never | |
1463 | * received an IRK for such a device. | |
1464 | */ | |
1465 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1466 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1467 | goto distribute; |
a9a58f86 JH |
1468 | } |
1469 | ||
fd349c02 JH |
1470 | bacpy(&smp->id_addr, &info->bdaddr); |
1471 | smp->id_addr_type = info->addr_type; | |
1472 | ||
1473 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1474 | bacpy(&rpa, &hcon->dst); | |
1475 | else | |
1476 | bacpy(&rpa, BDADDR_ANY); | |
1477 | ||
23d0e128 JH |
1478 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1479 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1480 | |
31dd624e | 1481 | distribute: |
c6e81e9a JH |
1482 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
1483 | smp_distribute_keys(smp); | |
fd349c02 JH |
1484 | |
1485 | return 0; | |
1486 | } | |
1487 | ||
7ee4ea36 MH |
1488 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1489 | { | |
1490 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
1491 | struct l2cap_chan *chan = conn->smp; |
1492 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
1493 | struct smp_csrk *csrk; |
1494 | ||
1495 | BT_DBG("conn %p", conn); | |
1496 | ||
1497 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1498 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 1499 | |
7ee4ea36 MH |
1500 | /* Mark the information as received */ |
1501 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1502 | ||
1503 | skb_pull(skb, sizeof(*rp)); | |
1504 | ||
7ee4ea36 MH |
1505 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
1506 | if (csrk) { | |
1507 | csrk->master = 0x01; | |
1508 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1509 | } | |
1510 | smp->csrk = csrk; | |
d6268e86 | 1511 | smp_distribute_keys(smp); |
7ee4ea36 MH |
1512 | |
1513 | return 0; | |
1514 | } | |
1515 | ||
4befb867 | 1516 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 1517 | { |
5d88cc73 | 1518 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 1519 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 1520 | struct smp_chan *smp; |
92381f5c | 1521 | __u8 code, reason; |
eb492e01 AB |
1522 | int err = 0; |
1523 | ||
7b9899db MH |
1524 | if (hcon->type != LE_LINK) { |
1525 | kfree_skb(skb); | |
3432711f | 1526 | return 0; |
7b9899db MH |
1527 | } |
1528 | ||
8ae9b984 | 1529 | if (skb->len < 1) |
92381f5c | 1530 | return -EILSEQ; |
92381f5c | 1531 | |
06ae3314 | 1532 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1533 | reason = SMP_PAIRING_NOTSUPP; |
1534 | goto done; | |
1535 | } | |
1536 | ||
92381f5c | 1537 | code = skb->data[0]; |
eb492e01 AB |
1538 | skb_pull(skb, sizeof(code)); |
1539 | ||
b28b4943 JH |
1540 | smp = chan->data; |
1541 | ||
1542 | if (code > SMP_CMD_MAX) | |
1543 | goto drop; | |
1544 | ||
24bd0bd9 | 1545 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
1546 | goto drop; |
1547 | ||
1548 | /* If we don't have a context the only allowed commands are | |
1549 | * pairing request and security request. | |
8cf9fa12 | 1550 | */ |
b28b4943 JH |
1551 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
1552 | goto drop; | |
8cf9fa12 | 1553 | |
eb492e01 AB |
1554 | switch (code) { |
1555 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1556 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1557 | break; |
1558 | ||
1559 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1560 | smp_failure(conn, 0); |
da85e5e5 | 1561 | err = -EPERM; |
eb492e01 AB |
1562 | break; |
1563 | ||
1564 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1565 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1566 | break; |
1567 | ||
1568 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1569 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1570 | break; |
1571 | ||
eb492e01 | 1572 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1573 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1574 | break; |
1575 | ||
eb492e01 | 1576 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1577 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1578 | break; |
1579 | ||
eb492e01 | 1580 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1581 | reason = smp_cmd_encrypt_info(conn, skb); |
1582 | break; | |
1583 | ||
eb492e01 | 1584 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1585 | reason = smp_cmd_master_ident(conn, skb); |
1586 | break; | |
1587 | ||
eb492e01 | 1588 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1589 | reason = smp_cmd_ident_info(conn, skb); |
1590 | break; | |
1591 | ||
eb492e01 | 1592 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1593 | reason = smp_cmd_ident_addr_info(conn, skb); |
1594 | break; | |
1595 | ||
eb492e01 | 1596 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1597 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1598 | break; |
1599 | ||
eb492e01 AB |
1600 | default: |
1601 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 1602 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 1603 | goto done; |
eb492e01 AB |
1604 | } |
1605 | ||
3a0259bb | 1606 | done: |
9b7b18ef JH |
1607 | if (!err) { |
1608 | if (reason) | |
1609 | smp_failure(conn, reason); | |
8ae9b984 | 1610 | kfree_skb(skb); |
9b7b18ef JH |
1611 | } |
1612 | ||
eb492e01 | 1613 | return err; |
b28b4943 JH |
1614 | |
1615 | drop: | |
1616 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
1617 | code, &hcon->dst); | |
1618 | kfree_skb(skb); | |
1619 | return 0; | |
eb492e01 | 1620 | } |
7034b911 | 1621 | |
70db83c4 JH |
1622 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
1623 | { | |
1624 | struct l2cap_conn *conn = chan->conn; | |
1625 | ||
1626 | BT_DBG("chan %p", chan); | |
1627 | ||
fc75cc86 | 1628 | if (chan->data) |
5d88cc73 | 1629 | smp_chan_destroy(conn); |
5d88cc73 | 1630 | |
70db83c4 JH |
1631 | conn->smp = NULL; |
1632 | l2cap_chan_put(chan); | |
1633 | } | |
1634 | ||
44f1a7ab JH |
1635 | static void smp_resume_cb(struct l2cap_chan *chan) |
1636 | { | |
b68fda68 | 1637 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
1638 | struct l2cap_conn *conn = chan->conn; |
1639 | struct hci_conn *hcon = conn->hcon; | |
1640 | ||
1641 | BT_DBG("chan %p", chan); | |
1642 | ||
86d1407c JH |
1643 | if (!smp) |
1644 | return; | |
b68fda68 | 1645 | |
84bc0db5 JH |
1646 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
1647 | return; | |
1648 | ||
86d1407c JH |
1649 | cancel_delayed_work(&smp->security_timer); |
1650 | ||
d6268e86 | 1651 | smp_distribute_keys(smp); |
44f1a7ab JH |
1652 | } |
1653 | ||
70db83c4 JH |
1654 | static void smp_ready_cb(struct l2cap_chan *chan) |
1655 | { | |
1656 | struct l2cap_conn *conn = chan->conn; | |
1657 | ||
1658 | BT_DBG("chan %p", chan); | |
1659 | ||
1660 | conn->smp = chan; | |
1661 | l2cap_chan_hold(chan); | |
1662 | } | |
1663 | ||
4befb867 JH |
1664 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
1665 | { | |
1666 | int err; | |
1667 | ||
1668 | BT_DBG("chan %p", chan); | |
1669 | ||
1670 | err = smp_sig_channel(chan, skb); | |
1671 | if (err) { | |
b68fda68 | 1672 | struct smp_chan *smp = chan->data; |
4befb867 | 1673 | |
b68fda68 JH |
1674 | if (smp) |
1675 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 1676 | |
1e91c29e | 1677 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
1678 | } |
1679 | ||
1680 | return err; | |
1681 | } | |
1682 | ||
70db83c4 JH |
1683 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
1684 | unsigned long hdr_len, | |
1685 | unsigned long len, int nb) | |
1686 | { | |
1687 | struct sk_buff *skb; | |
1688 | ||
1689 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
1690 | if (!skb) | |
1691 | return ERR_PTR(-ENOMEM); | |
1692 | ||
1693 | skb->priority = HCI_PRIO_MAX; | |
1694 | bt_cb(skb)->chan = chan; | |
1695 | ||
1696 | return skb; | |
1697 | } | |
1698 | ||
1699 | static const struct l2cap_ops smp_chan_ops = { | |
1700 | .name = "Security Manager", | |
1701 | .ready = smp_ready_cb, | |
5d88cc73 | 1702 | .recv = smp_recv_cb, |
70db83c4 JH |
1703 | .alloc_skb = smp_alloc_skb_cb, |
1704 | .teardown = smp_teardown_cb, | |
44f1a7ab | 1705 | .resume = smp_resume_cb, |
70db83c4 JH |
1706 | |
1707 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
1708 | .state_change = l2cap_chan_no_state_change, |
1709 | .close = l2cap_chan_no_close, | |
1710 | .defer = l2cap_chan_no_defer, | |
1711 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
1712 | .set_shutdown = l2cap_chan_no_set_shutdown, |
1713 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1714 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1715 | }; | |
1716 | ||
1717 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
1718 | { | |
1719 | struct l2cap_chan *chan; | |
1720 | ||
1721 | BT_DBG("pchan %p", pchan); | |
1722 | ||
1723 | chan = l2cap_chan_create(); | |
1724 | if (!chan) | |
1725 | return NULL; | |
1726 | ||
1727 | chan->chan_type = pchan->chan_type; | |
1728 | chan->ops = &smp_chan_ops; | |
1729 | chan->scid = pchan->scid; | |
1730 | chan->dcid = chan->scid; | |
1731 | chan->imtu = pchan->imtu; | |
1732 | chan->omtu = pchan->omtu; | |
1733 | chan->mode = pchan->mode; | |
1734 | ||
abe84903 JH |
1735 | /* Other L2CAP channels may request SMP routines in order to |
1736 | * change the security level. This means that the SMP channel | |
1737 | * lock must be considered in its own category to avoid lockdep | |
1738 | * warnings. | |
1739 | */ | |
1740 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
1741 | ||
70db83c4 JH |
1742 | BT_DBG("created chan %p", chan); |
1743 | ||
1744 | return chan; | |
1745 | } | |
1746 | ||
1747 | static const struct l2cap_ops smp_root_chan_ops = { | |
1748 | .name = "Security Manager Root", | |
1749 | .new_connection = smp_new_conn_cb, | |
1750 | ||
1751 | /* None of these are implemented for the root channel */ | |
1752 | .close = l2cap_chan_no_close, | |
1753 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
1754 | .recv = l2cap_chan_no_recv, | |
1755 | .state_change = l2cap_chan_no_state_change, | |
1756 | .teardown = l2cap_chan_no_teardown, | |
1757 | .ready = l2cap_chan_no_ready, | |
1758 | .defer = l2cap_chan_no_defer, | |
1759 | .suspend = l2cap_chan_no_suspend, | |
1760 | .resume = l2cap_chan_no_resume, | |
1761 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1762 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1763 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1764 | }; | |
1765 | ||
711eafe3 JH |
1766 | int smp_register(struct hci_dev *hdev) |
1767 | { | |
70db83c4 | 1768 | struct l2cap_chan *chan; |
defce9e8 | 1769 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 1770 | |
711eafe3 JH |
1771 | BT_DBG("%s", hdev->name); |
1772 | ||
adae20cb | 1773 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, 0); |
defce9e8 JH |
1774 | if (IS_ERR(tfm_aes)) { |
1775 | int err = PTR_ERR(tfm_aes); | |
711eafe3 | 1776 | BT_ERR("Unable to create crypto context"); |
711eafe3 JH |
1777 | return err; |
1778 | } | |
1779 | ||
70db83c4 JH |
1780 | chan = l2cap_chan_create(); |
1781 | if (!chan) { | |
defce9e8 | 1782 | crypto_free_blkcipher(tfm_aes); |
70db83c4 JH |
1783 | return -ENOMEM; |
1784 | } | |
1785 | ||
defce9e8 JH |
1786 | chan->data = tfm_aes; |
1787 | ||
5d88cc73 | 1788 | l2cap_add_scid(chan, L2CAP_CID_SMP); |
70db83c4 JH |
1789 | |
1790 | l2cap_chan_set_defaults(chan); | |
1791 | ||
1792 | bacpy(&chan->src, &hdev->bdaddr); | |
1793 | chan->src_type = BDADDR_LE_PUBLIC; | |
1794 | chan->state = BT_LISTEN; | |
1795 | chan->mode = L2CAP_MODE_BASIC; | |
1796 | chan->imtu = L2CAP_DEFAULT_MTU; | |
1797 | chan->ops = &smp_root_chan_ops; | |
1798 | ||
abe84903 JH |
1799 | /* Set correct nesting level for a parent/listening channel */ |
1800 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
1801 | ||
70db83c4 JH |
1802 | hdev->smp_data = chan; |
1803 | ||
711eafe3 JH |
1804 | return 0; |
1805 | } | |
1806 | ||
1807 | void smp_unregister(struct hci_dev *hdev) | |
1808 | { | |
70db83c4 | 1809 | struct l2cap_chan *chan = hdev->smp_data; |
defce9e8 | 1810 | struct crypto_blkcipher *tfm_aes; |
70db83c4 JH |
1811 | |
1812 | if (!chan) | |
1813 | return; | |
1814 | ||
1815 | BT_DBG("%s chan %p", hdev->name, chan); | |
711eafe3 | 1816 | |
defce9e8 JH |
1817 | tfm_aes = chan->data; |
1818 | if (tfm_aes) { | |
1819 | chan->data = NULL; | |
1820 | crypto_free_blkcipher(tfm_aes); | |
711eafe3 | 1821 | } |
70db83c4 JH |
1822 | |
1823 | hdev->smp_data = NULL; | |
1824 | l2cap_chan_put(chan); | |
711eafe3 | 1825 | } |