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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, |
d8f8edbe | 53 | SMP_FLAG_REMOTE_PK, |
533e35d4 | 54 | }; |
4bc58f51 JH |
55 | |
56 | struct smp_chan { | |
b68fda68 JH |
57 | struct l2cap_conn *conn; |
58 | struct delayed_work security_timer; | |
b28b4943 | 59 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 60 | |
4bc58f51 JH |
61 | u8 preq[7]; /* SMP Pairing Request */ |
62 | u8 prsp[7]; /* SMP Pairing Response */ | |
63 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
64 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
65 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
66 | u8 tk[16]; /* SMP Temporary Key */ | |
67 | u8 enc_key_size; | |
68 | u8 remote_key_dist; | |
69 | bdaddr_t id_addr; | |
70 | u8 id_addr_type; | |
71 | u8 irk[16]; | |
72 | struct smp_csrk *csrk; | |
73 | struct smp_csrk *slave_csrk; | |
74 | struct smp_ltk *ltk; | |
75 | struct smp_ltk *slave_ltk; | |
76 | struct smp_irk *remote_irk; | |
4a74d658 | 77 | unsigned long flags; |
6a7bd103 | 78 | |
3b19146d JH |
79 | /* Secure Connections variables */ |
80 | u8 local_pk[64]; | |
81 | u8 local_sk[32]; | |
d8f8edbe JH |
82 | u8 remote_pk[64]; |
83 | u8 dhkey[32]; | |
3b19146d | 84 | |
6a7bd103 | 85 | struct crypto_blkcipher *tfm_aes; |
407cecf6 | 86 | struct crypto_hash *tfm_cmac; |
4bc58f51 JH |
87 | }; |
88 | ||
8a2936f4 | 89 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 90 | { |
8a2936f4 | 91 | size_t i; |
d22ef0bc | 92 | |
8a2936f4 JH |
93 | for (i = 0; i < len; i++) |
94 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
95 | } |
96 | ||
97 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
98 | { | |
99 | struct blkcipher_desc desc; | |
100 | struct scatterlist sg; | |
943a732a | 101 | uint8_t tmp[16], data[16]; |
201a5929 | 102 | int err; |
d22ef0bc AB |
103 | |
104 | if (tfm == NULL) { | |
105 | BT_ERR("tfm %p", tfm); | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
109 | desc.tfm = tfm; | |
110 | desc.flags = 0; | |
111 | ||
943a732a | 112 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 113 | swap_buf(k, tmp, 16); |
943a732a JH |
114 | |
115 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
116 | if (err) { |
117 | BT_ERR("cipher setkey failed: %d", err); | |
118 | return err; | |
119 | } | |
120 | ||
943a732a | 121 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 122 | swap_buf(r, data, 16); |
943a732a JH |
123 | |
124 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 125 | |
d22ef0bc AB |
126 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
127 | if (err) | |
128 | BT_ERR("Encrypt data error %d", err); | |
129 | ||
943a732a | 130 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 131 | swap_buf(data, r, 16); |
943a732a | 132 | |
d22ef0bc AB |
133 | return err; |
134 | } | |
135 | ||
60478054 JH |
136 | static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3]) |
137 | { | |
943a732a | 138 | u8 _res[16]; |
60478054 JH |
139 | int err; |
140 | ||
141 | /* r' = padding || r */ | |
943a732a JH |
142 | memcpy(_res, r, 3); |
143 | memset(_res + 3, 0, 13); | |
60478054 | 144 | |
943a732a | 145 | err = smp_e(tfm, irk, _res); |
60478054 JH |
146 | if (err) { |
147 | BT_ERR("Encrypt error"); | |
148 | return err; | |
149 | } | |
150 | ||
151 | /* The output of the random address function ah is: | |
152 | * ah(h, r) = e(k, r') mod 2^24 | |
153 | * The output of the security function e is then truncated to 24 bits | |
154 | * by taking the least significant 24 bits of the output of e as the | |
155 | * result of ah. | |
156 | */ | |
943a732a | 157 | memcpy(res, _res, 3); |
60478054 JH |
158 | |
159 | return 0; | |
160 | } | |
161 | ||
defce9e8 | 162 | bool smp_irk_matches(struct hci_dev *hdev, u8 irk[16], bdaddr_t *bdaddr) |
60478054 | 163 | { |
defce9e8 JH |
164 | struct l2cap_chan *chan = hdev->smp_data; |
165 | struct crypto_blkcipher *tfm; | |
60478054 JH |
166 | u8 hash[3]; |
167 | int err; | |
168 | ||
defce9e8 JH |
169 | if (!chan || !chan->data) |
170 | return false; | |
171 | ||
172 | tfm = chan->data; | |
173 | ||
60478054 JH |
174 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
175 | ||
176 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
177 | if (err) | |
178 | return false; | |
179 | ||
180 | return !memcmp(bdaddr->b, hash, 3); | |
181 | } | |
182 | ||
defce9e8 | 183 | int smp_generate_rpa(struct hci_dev *hdev, u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 184 | { |
defce9e8 JH |
185 | struct l2cap_chan *chan = hdev->smp_data; |
186 | struct crypto_blkcipher *tfm; | |
b1e2b3ae JH |
187 | int err; |
188 | ||
defce9e8 JH |
189 | if (!chan || !chan->data) |
190 | return -EOPNOTSUPP; | |
191 | ||
192 | tfm = chan->data; | |
193 | ||
b1e2b3ae JH |
194 | get_random_bytes(&rpa->b[3], 3); |
195 | ||
196 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
197 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
198 | ||
199 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
200 | if (err < 0) | |
201 | return err; | |
202 | ||
203 | BT_DBG("RPA %pMR", rpa); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
e491eaf3 JH |
208 | static int smp_c1(struct crypto_blkcipher *tfm_aes, u8 k[16], u8 r[16], |
209 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, u8 _rat, | |
210 | bdaddr_t *ra, u8 res[16]) | |
d22ef0bc AB |
211 | { |
212 | u8 p1[16], p2[16]; | |
213 | int err; | |
214 | ||
215 | memset(p1, 0, 16); | |
216 | ||
217 | /* p1 = pres || preq || _rat || _iat */ | |
943a732a JH |
218 | p1[0] = _iat; |
219 | p1[1] = _rat; | |
220 | memcpy(p1 + 2, preq, 7); | |
221 | memcpy(p1 + 9, pres, 7); | |
d22ef0bc AB |
222 | |
223 | /* p2 = padding || ia || ra */ | |
943a732a JH |
224 | memcpy(p2, ra, 6); |
225 | memcpy(p2 + 6, ia, 6); | |
226 | memset(p2 + 12, 0, 4); | |
d22ef0bc AB |
227 | |
228 | /* res = r XOR p1 */ | |
229 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
230 | ||
231 | /* res = e(k, res) */ | |
e491eaf3 | 232 | err = smp_e(tfm_aes, k, res); |
d22ef0bc AB |
233 | if (err) { |
234 | BT_ERR("Encrypt data error"); | |
235 | return err; | |
236 | } | |
237 | ||
238 | /* res = res XOR p2 */ | |
239 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
240 | ||
241 | /* res = e(k, res) */ | |
e491eaf3 | 242 | err = smp_e(tfm_aes, k, res); |
d22ef0bc AB |
243 | if (err) |
244 | BT_ERR("Encrypt data error"); | |
245 | ||
246 | return err; | |
247 | } | |
248 | ||
e491eaf3 JH |
249 | static int smp_s1(struct crypto_blkcipher *tfm_aes, u8 k[16], u8 r1[16], |
250 | u8 r2[16], u8 _r[16]) | |
d22ef0bc AB |
251 | { |
252 | int err; | |
253 | ||
254 | /* Just least significant octets from r1 and r2 are considered */ | |
943a732a JH |
255 | memcpy(_r, r2, 8); |
256 | memcpy(_r + 8, r1, 8); | |
d22ef0bc | 257 | |
e491eaf3 | 258 | err = smp_e(tfm_aes, k, _r); |
d22ef0bc AB |
259 | if (err) |
260 | BT_ERR("Encrypt data error"); | |
261 | ||
262 | return err; | |
263 | } | |
264 | ||
5d88cc73 | 265 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 266 | { |
5d88cc73 | 267 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 268 | struct smp_chan *smp; |
5d88cc73 JH |
269 | struct kvec iv[2]; |
270 | struct msghdr msg; | |
eb492e01 | 271 | |
5d88cc73 JH |
272 | if (!chan) |
273 | return; | |
eb492e01 | 274 | |
5d88cc73 | 275 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 276 | |
5d88cc73 JH |
277 | iv[0].iov_base = &code; |
278 | iv[0].iov_len = 1; | |
eb492e01 | 279 | |
5d88cc73 JH |
280 | iv[1].iov_base = data; |
281 | iv[1].iov_len = len; | |
eb492e01 | 282 | |
5d88cc73 | 283 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 284 | |
5d88cc73 JH |
285 | msg.msg_iov = (struct iovec *) &iv; |
286 | msg.msg_iovlen = 2; | |
eb492e01 | 287 | |
5d88cc73 | 288 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 289 | |
b68fda68 JH |
290 | if (!chan->data) |
291 | return; | |
292 | ||
293 | smp = chan->data; | |
294 | ||
295 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 296 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
297 | } |
298 | ||
d2eb9e10 | 299 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 300 | { |
d2eb9e10 JH |
301 | if (authreq & SMP_AUTH_MITM) { |
302 | if (authreq & SMP_AUTH_SC) | |
303 | return BT_SECURITY_FIPS; | |
304 | else | |
305 | return BT_SECURITY_HIGH; | |
306 | } else { | |
2b64d153 | 307 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 308 | } |
2b64d153 BG |
309 | } |
310 | ||
311 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
312 | { | |
313 | switch (sec_level) { | |
d2eb9e10 | 314 | case BT_SECURITY_FIPS: |
2b64d153 BG |
315 | case BT_SECURITY_HIGH: |
316 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
317 | case BT_SECURITY_MEDIUM: | |
318 | return SMP_AUTH_BONDING; | |
319 | default: | |
320 | return SMP_AUTH_NONE; | |
321 | } | |
322 | } | |
323 | ||
b8e66eac | 324 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
325 | struct smp_cmd_pairing *req, |
326 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 327 | { |
5d88cc73 JH |
328 | struct l2cap_chan *chan = conn->smp; |
329 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
330 | struct hci_conn *hcon = conn->hcon; |
331 | struct hci_dev *hdev = hcon->hdev; | |
332 | u8 local_dist = 0, remote_dist = 0; | |
54790f73 | 333 | |
b6ae8457 | 334 | if (test_bit(HCI_BONDABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
335 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
336 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 337 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
338 | } else { |
339 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
340 | } |
341 | ||
fd349c02 JH |
342 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
343 | remote_dist |= SMP_DIST_ID_KEY; | |
344 | ||
863efaf2 JH |
345 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
346 | local_dist |= SMP_DIST_ID_KEY; | |
347 | ||
df8e1a4c JH |
348 | if (test_bit(HCI_SC_ENABLED, &hdev->dev_flags)) { |
349 | if ((authreq & SMP_AUTH_SC) && | |
350 | test_bit(HCI_SSP_ENABLED, &hdev->dev_flags)) { | |
351 | local_dist |= SMP_DIST_LINK_KEY; | |
352 | remote_dist |= SMP_DIST_LINK_KEY; | |
353 | } | |
354 | } else { | |
355 | authreq &= ~SMP_AUTH_SC; | |
356 | } | |
357 | ||
54790f73 VCG |
358 | if (rsp == NULL) { |
359 | req->io_capability = conn->hcon->io_capability; | |
360 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
361 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
362 | req->init_key_dist = local_dist; |
363 | req->resp_key_dist = remote_dist; | |
0edb14de | 364 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
365 | |
366 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
367 | return; |
368 | } | |
369 | ||
370 | rsp->io_capability = conn->hcon->io_capability; | |
371 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
372 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
373 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
374 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 375 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
376 | |
377 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
378 | } |
379 | ||
3158c50c VCG |
380 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
381 | { | |
5d88cc73 JH |
382 | struct l2cap_chan *chan = conn->smp; |
383 | struct smp_chan *smp = chan->data; | |
1c1def09 | 384 | |
3158c50c | 385 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 386 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
387 | return SMP_ENC_KEY_SIZE; |
388 | ||
f7aa611a | 389 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
390 | |
391 | return 0; | |
392 | } | |
393 | ||
6f48e260 JH |
394 | static void smp_chan_destroy(struct l2cap_conn *conn) |
395 | { | |
396 | struct l2cap_chan *chan = conn->smp; | |
397 | struct smp_chan *smp = chan->data; | |
398 | bool complete; | |
399 | ||
400 | BUG_ON(!smp); | |
401 | ||
402 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 403 | |
6f48e260 JH |
404 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
405 | mgmt_smp_complete(conn->hcon, complete); | |
406 | ||
407 | kfree(smp->csrk); | |
408 | kfree(smp->slave_csrk); | |
409 | ||
410 | crypto_free_blkcipher(smp->tfm_aes); | |
407cecf6 | 411 | crypto_free_hash(smp->tfm_cmac); |
6f48e260 JH |
412 | |
413 | /* If pairing failed clean up any keys we might have */ | |
414 | if (!complete) { | |
415 | if (smp->ltk) { | |
970d0f1b JH |
416 | list_del_rcu(&smp->ltk->list); |
417 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
418 | } |
419 | ||
420 | if (smp->slave_ltk) { | |
970d0f1b JH |
421 | list_del_rcu(&smp->slave_ltk->list); |
422 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
423 | } |
424 | ||
425 | if (smp->remote_irk) { | |
adae20cb JH |
426 | list_del_rcu(&smp->remote_irk->list); |
427 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
428 | } |
429 | } | |
430 | ||
431 | chan->data = NULL; | |
432 | kfree(smp); | |
433 | hci_conn_drop(conn->hcon); | |
434 | } | |
435 | ||
84794e11 | 436 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 437 | { |
bab73cb6 | 438 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 439 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 440 | |
84794e11 | 441 | if (reason) |
4f957a76 | 442 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 443 | &reason); |
4f957a76 | 444 | |
ce39fb4e | 445 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
e1e930f5 | 446 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 447 | |
fc75cc86 | 448 | if (chan->data) |
f1c09c07 | 449 | smp_chan_destroy(conn); |
4f957a76 BG |
450 | } |
451 | ||
2b64d153 BG |
452 | #define JUST_WORKS 0x00 |
453 | #define JUST_CFM 0x01 | |
454 | #define REQ_PASSKEY 0x02 | |
455 | #define CFM_PASSKEY 0x03 | |
456 | #define REQ_OOB 0x04 | |
457 | #define OVERLAP 0xFF | |
458 | ||
459 | static const u8 gen_method[5][5] = { | |
460 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
461 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
462 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
463 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
464 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
465 | }; | |
466 | ||
581370cc JH |
467 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
468 | { | |
2bcd4003 JH |
469 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
470 | * converted later to JUST_WORKS if we're initiators. | |
471 | */ | |
581370cc JH |
472 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
473 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 474 | return JUST_CFM; |
581370cc JH |
475 | |
476 | return gen_method[remote_io][local_io]; | |
477 | } | |
478 | ||
2b64d153 BG |
479 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
480 | u8 local_io, u8 remote_io) | |
481 | { | |
482 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
483 | struct l2cap_chan *chan = conn->smp; |
484 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
485 | u8 method; |
486 | u32 passkey = 0; | |
487 | int ret = 0; | |
488 | ||
489 | /* Initialize key for JUST WORKS */ | |
490 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 491 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
492 | |
493 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
494 | ||
2bcd4003 JH |
495 | /* If neither side wants MITM, either "just" confirm an incoming |
496 | * request or use just-works for outgoing ones. The JUST_CFM | |
497 | * will be converted to JUST_WORKS if necessary later in this | |
498 | * function. If either side has MITM look up the method from the | |
499 | * table. | |
500 | */ | |
581370cc | 501 | if (!(auth & SMP_AUTH_MITM)) |
2bcd4003 | 502 | method = JUST_CFM; |
2b64d153 | 503 | else |
581370cc | 504 | method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 505 | |
a82505c7 | 506 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 507 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
508 | method = JUST_WORKS; |
509 | ||
02f3e254 JH |
510 | /* Don't bother user space with no IO capabilities */ |
511 | if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
512 | method = JUST_WORKS; | |
513 | ||
2b64d153 BG |
514 | /* If Just Works, Continue with Zero TK */ |
515 | if (method == JUST_WORKS) { | |
4a74d658 | 516 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
517 | return 0; |
518 | } | |
519 | ||
520 | /* Not Just Works/Confirm results in MITM Authentication */ | |
5eb596f5 | 521 | if (method != JUST_CFM) { |
4a74d658 | 522 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
523 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
524 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
525 | } | |
2b64d153 BG |
526 | |
527 | /* If both devices have Keyoard-Display I/O, the master | |
528 | * Confirms and the slave Enters the passkey. | |
529 | */ | |
530 | if (method == OVERLAP) { | |
40bef302 | 531 | if (hcon->role == HCI_ROLE_MASTER) |
2b64d153 BG |
532 | method = CFM_PASSKEY; |
533 | else | |
534 | method = REQ_PASSKEY; | |
535 | } | |
536 | ||
01ad34d2 | 537 | /* Generate random passkey. */ |
2b64d153 | 538 | if (method == CFM_PASSKEY) { |
943a732a | 539 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
540 | get_random_bytes(&passkey, sizeof(passkey)); |
541 | passkey %= 1000000; | |
943a732a | 542 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 543 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 544 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
545 | } |
546 | ||
2b64d153 | 547 | if (method == REQ_PASSKEY) |
ce39fb4e | 548 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 549 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
550 | else if (method == JUST_CFM) |
551 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
552 | hcon->type, hcon->dst_type, | |
553 | passkey, 1); | |
2b64d153 | 554 | else |
01ad34d2 | 555 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 556 | hcon->type, hcon->dst_type, |
39adbffe | 557 | passkey, 0); |
2b64d153 | 558 | |
2b64d153 BG |
559 | return ret; |
560 | } | |
561 | ||
1cc61144 | 562 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 563 | { |
8aab4757 | 564 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
565 | struct smp_cmd_pairing_confirm cp; |
566 | int ret; | |
8aab4757 VCG |
567 | |
568 | BT_DBG("conn %p", conn); | |
569 | ||
e491eaf3 | 570 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 571 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
572 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
573 | cp.confirm_val); | |
1cc61144 JH |
574 | if (ret) |
575 | return SMP_UNSPECIFIED; | |
8aab4757 | 576 | |
4a74d658 | 577 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 578 | |
8aab4757 VCG |
579 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
580 | ||
b28b4943 JH |
581 | if (conn->hcon->out) |
582 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
583 | else | |
584 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
585 | ||
1cc61144 | 586 | return 0; |
8aab4757 VCG |
587 | } |
588 | ||
861580a9 | 589 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 590 | { |
8aab4757 VCG |
591 | struct l2cap_conn *conn = smp->conn; |
592 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 593 | u8 confirm[16]; |
8aab4757 VCG |
594 | int ret; |
595 | ||
ec70f36f | 596 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 597 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
598 | |
599 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
600 | ||
e491eaf3 | 601 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 602 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 603 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
604 | if (ret) |
605 | return SMP_UNSPECIFIED; | |
8aab4757 | 606 | |
8aab4757 VCG |
607 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
608 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 609 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
610 | } |
611 | ||
612 | if (hcon->out) { | |
fe39c7b2 MH |
613 | u8 stk[16]; |
614 | __le64 rand = 0; | |
615 | __le16 ediv = 0; | |
8aab4757 | 616 | |
e491eaf3 | 617 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 618 | |
f7aa611a | 619 | memset(stk + smp->enc_key_size, 0, |
04124681 | 620 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 621 | |
861580a9 JH |
622 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
623 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
624 | |
625 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 626 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 627 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 628 | } else { |
fff3490f | 629 | u8 stk[16], auth; |
fe39c7b2 MH |
630 | __le64 rand = 0; |
631 | __le16 ediv = 0; | |
8aab4757 | 632 | |
943a732a JH |
633 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
634 | smp->prnd); | |
8aab4757 | 635 | |
e491eaf3 | 636 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 637 | |
f7aa611a | 638 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 639 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 640 | |
fff3490f JH |
641 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
642 | auth = 1; | |
643 | else | |
644 | auth = 0; | |
645 | ||
7d5843b7 JH |
646 | /* Even though there's no _SLAVE suffix this is the |
647 | * slave STK we're adding for later lookup (the master | |
648 | * STK never needs to be stored). | |
649 | */ | |
ce39fb4e | 650 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 651 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
652 | } |
653 | ||
861580a9 | 654 | return 0; |
8aab4757 VCG |
655 | } |
656 | ||
44f1a7ab JH |
657 | static void smp_notify_keys(struct l2cap_conn *conn) |
658 | { | |
659 | struct l2cap_chan *chan = conn->smp; | |
660 | struct smp_chan *smp = chan->data; | |
661 | struct hci_conn *hcon = conn->hcon; | |
662 | struct hci_dev *hdev = hcon->hdev; | |
663 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
664 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
665 | bool persistent; | |
666 | ||
667 | if (smp->remote_irk) { | |
668 | mgmt_new_irk(hdev, smp->remote_irk); | |
669 | /* Now that user space can be considered to know the | |
670 | * identity address track the connection based on it | |
671 | * from now on. | |
672 | */ | |
673 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
674 | hcon->dst_type = smp->remote_irk->addr_type; | |
f3d82d0c | 675 | queue_work(hdev->workqueue, &conn->id_addr_update_work); |
44f1a7ab JH |
676 | |
677 | /* When receiving an indentity resolving key for | |
678 | * a remote device that does not use a resolvable | |
679 | * private address, just remove the key so that | |
680 | * it is possible to use the controller white | |
681 | * list for scanning. | |
682 | * | |
683 | * Userspace will have been told to not store | |
684 | * this key at this point. So it is safe to | |
685 | * just remove it. | |
686 | */ | |
687 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
adae20cb JH |
688 | list_del_rcu(&smp->remote_irk->list); |
689 | kfree_rcu(smp->remote_irk, rcu); | |
44f1a7ab JH |
690 | smp->remote_irk = NULL; |
691 | } | |
692 | } | |
693 | ||
694 | /* The LTKs and CSRKs should be persistent only if both sides | |
695 | * had the bonding bit set in their authentication requests. | |
696 | */ | |
697 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
698 | ||
699 | if (smp->csrk) { | |
700 | smp->csrk->bdaddr_type = hcon->dst_type; | |
701 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
702 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
703 | } | |
704 | ||
705 | if (smp->slave_csrk) { | |
706 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
707 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
708 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
709 | } | |
710 | ||
711 | if (smp->ltk) { | |
712 | smp->ltk->bdaddr_type = hcon->dst_type; | |
713 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
714 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
715 | } | |
716 | ||
717 | if (smp->slave_ltk) { | |
718 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
719 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
720 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
721 | } | |
722 | } | |
723 | ||
b28b4943 JH |
724 | static void smp_allow_key_dist(struct smp_chan *smp) |
725 | { | |
726 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
727 | * will be allowed in each PDU handler to ensure we receive | |
728 | * them in the correct order. | |
729 | */ | |
730 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
731 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
732 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
733 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
734 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
735 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
736 | } | |
737 | ||
d6268e86 | 738 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
739 | { |
740 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 741 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
742 | struct hci_conn *hcon = conn->hcon; |
743 | struct hci_dev *hdev = hcon->hdev; | |
744 | __u8 *keydist; | |
745 | ||
746 | BT_DBG("conn %p", conn); | |
747 | ||
44f1a7ab JH |
748 | rsp = (void *) &smp->prsp[1]; |
749 | ||
750 | /* The responder sends its keys first */ | |
b28b4943 JH |
751 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
752 | smp_allow_key_dist(smp); | |
86d1407c | 753 | return; |
b28b4943 | 754 | } |
44f1a7ab JH |
755 | |
756 | req = (void *) &smp->preq[1]; | |
757 | ||
758 | if (hcon->out) { | |
759 | keydist = &rsp->init_key_dist; | |
760 | *keydist &= req->init_key_dist; | |
761 | } else { | |
762 | keydist = &rsp->resp_key_dist; | |
763 | *keydist &= req->resp_key_dist; | |
764 | } | |
765 | ||
766 | BT_DBG("keydist 0x%x", *keydist); | |
767 | ||
768 | if (*keydist & SMP_DIST_ENC_KEY) { | |
769 | struct smp_cmd_encrypt_info enc; | |
770 | struct smp_cmd_master_ident ident; | |
771 | struct smp_ltk *ltk; | |
772 | u8 authenticated; | |
773 | __le16 ediv; | |
774 | __le64 rand; | |
775 | ||
776 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
777 | get_random_bytes(&ediv, sizeof(ediv)); | |
778 | get_random_bytes(&rand, sizeof(rand)); | |
779 | ||
780 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
781 | ||
782 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
783 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
784 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
785 | smp->enc_key_size, ediv, rand); | |
786 | smp->slave_ltk = ltk; | |
787 | ||
788 | ident.ediv = ediv; | |
789 | ident.rand = rand; | |
790 | ||
791 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
792 | ||
793 | *keydist &= ~SMP_DIST_ENC_KEY; | |
794 | } | |
795 | ||
796 | if (*keydist & SMP_DIST_ID_KEY) { | |
797 | struct smp_cmd_ident_addr_info addrinfo; | |
798 | struct smp_cmd_ident_info idinfo; | |
799 | ||
800 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
801 | ||
802 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
803 | ||
804 | /* The hci_conn contains the local identity address | |
805 | * after the connection has been established. | |
806 | * | |
807 | * This is true even when the connection has been | |
808 | * established using a resolvable random address. | |
809 | */ | |
810 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
811 | addrinfo.addr_type = hcon->src_type; | |
812 | ||
813 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
814 | &addrinfo); | |
815 | ||
816 | *keydist &= ~SMP_DIST_ID_KEY; | |
817 | } | |
818 | ||
819 | if (*keydist & SMP_DIST_SIGN) { | |
820 | struct smp_cmd_sign_info sign; | |
821 | struct smp_csrk *csrk; | |
822 | ||
823 | /* Generate a new random key */ | |
824 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
825 | ||
826 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
827 | if (csrk) { | |
828 | csrk->master = 0x00; | |
829 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
830 | } | |
831 | smp->slave_csrk = csrk; | |
832 | ||
833 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
834 | ||
835 | *keydist &= ~SMP_DIST_SIGN; | |
836 | } | |
837 | ||
838 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
839 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
840 | smp_allow_key_dist(smp); | |
86d1407c | 841 | return; |
b28b4943 | 842 | } |
44f1a7ab | 843 | |
44f1a7ab JH |
844 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
845 | smp_notify_keys(conn); | |
846 | ||
847 | smp_chan_destroy(conn); | |
44f1a7ab JH |
848 | } |
849 | ||
b68fda68 JH |
850 | static void smp_timeout(struct work_struct *work) |
851 | { | |
852 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
853 | security_timer.work); | |
854 | struct l2cap_conn *conn = smp->conn; | |
855 | ||
856 | BT_DBG("conn %p", conn); | |
857 | ||
1e91c29e | 858 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
859 | } |
860 | ||
8aab4757 VCG |
861 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
862 | { | |
5d88cc73 | 863 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
864 | struct smp_chan *smp; |
865 | ||
f1560463 | 866 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 867 | if (!smp) |
8aab4757 VCG |
868 | return NULL; |
869 | ||
6a7bd103 JH |
870 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
871 | if (IS_ERR(smp->tfm_aes)) { | |
872 | BT_ERR("Unable to create ECB crypto context"); | |
873 | kfree(smp); | |
874 | return NULL; | |
875 | } | |
876 | ||
407cecf6 JH |
877 | smp->tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
878 | if (IS_ERR(smp->tfm_cmac)) { | |
879 | BT_ERR("Unable to create CMAC crypto context"); | |
880 | crypto_free_blkcipher(smp->tfm_aes); | |
881 | kfree(smp); | |
882 | return NULL; | |
883 | } | |
884 | ||
8aab4757 | 885 | smp->conn = conn; |
5d88cc73 | 886 | chan->data = smp; |
8aab4757 | 887 | |
b28b4943 JH |
888 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
889 | ||
b68fda68 JH |
890 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
891 | ||
8aab4757 VCG |
892 | hci_conn_hold(conn->hcon); |
893 | ||
894 | return smp; | |
895 | } | |
896 | ||
2b64d153 BG |
897 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
898 | { | |
b10e8017 | 899 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 900 | struct l2cap_chan *chan; |
2b64d153 BG |
901 | struct smp_chan *smp; |
902 | u32 value; | |
fc75cc86 | 903 | int err; |
2b64d153 BG |
904 | |
905 | BT_DBG(""); | |
906 | ||
fc75cc86 | 907 | if (!conn) |
2b64d153 BG |
908 | return -ENOTCONN; |
909 | ||
5d88cc73 JH |
910 | chan = conn->smp; |
911 | if (!chan) | |
912 | return -ENOTCONN; | |
913 | ||
fc75cc86 JH |
914 | l2cap_chan_lock(chan); |
915 | if (!chan->data) { | |
916 | err = -ENOTCONN; | |
917 | goto unlock; | |
918 | } | |
919 | ||
5d88cc73 | 920 | smp = chan->data; |
2b64d153 BG |
921 | |
922 | switch (mgmt_op) { | |
923 | case MGMT_OP_USER_PASSKEY_REPLY: | |
924 | value = le32_to_cpu(passkey); | |
943a732a | 925 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 926 | BT_DBG("PassKey: %d", value); |
943a732a | 927 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
928 | /* Fall Through */ |
929 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 930 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
931 | break; |
932 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
933 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 934 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
935 | err = 0; |
936 | goto unlock; | |
2b64d153 | 937 | default: |
84794e11 | 938 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
939 | err = -EOPNOTSUPP; |
940 | goto unlock; | |
2b64d153 BG |
941 | } |
942 | ||
fc75cc86 JH |
943 | err = 0; |
944 | ||
2b64d153 | 945 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
946 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
947 | u8 rsp = smp_confirm(smp); | |
948 | if (rsp) | |
949 | smp_failure(conn, rsp); | |
950 | } | |
2b64d153 | 951 | |
fc75cc86 JH |
952 | unlock: |
953 | l2cap_chan_unlock(chan); | |
954 | return err; | |
2b64d153 BG |
955 | } |
956 | ||
da85e5e5 | 957 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 958 | { |
3158c50c | 959 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 960 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 961 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 962 | struct smp_chan *smp; |
c7262e71 | 963 | u8 key_size, auth, sec_level; |
8aab4757 | 964 | int ret; |
88ba43b6 AB |
965 | |
966 | BT_DBG("conn %p", conn); | |
967 | ||
c46b98be | 968 | if (skb->len < sizeof(*req)) |
38e4a915 | 969 | return SMP_INVALID_PARAMS; |
c46b98be | 970 | |
40bef302 | 971 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
972 | return SMP_CMD_NOTSUPP; |
973 | ||
fc75cc86 | 974 | if (!chan->data) |
8aab4757 | 975 | smp = smp_chan_create(conn); |
fc75cc86 | 976 | else |
5d88cc73 | 977 | smp = chan->data; |
8aab4757 | 978 | |
d08fd0e7 AE |
979 | if (!smp) |
980 | return SMP_UNSPECIFIED; | |
d26a2345 | 981 | |
c05b9339 | 982 | /* We didn't start the pairing, so match remote */ |
0edb14de | 983 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 984 | |
b6ae8457 | 985 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
c05b9339 | 986 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
987 | return SMP_PAIRING_NOTSUPP; |
988 | ||
1c1def09 VCG |
989 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
990 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 991 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 992 | |
5be5e275 | 993 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
994 | sec_level = BT_SECURITY_MEDIUM; |
995 | else | |
996 | sec_level = authreq_to_seclevel(auth); | |
997 | ||
c7262e71 JH |
998 | if (sec_level > conn->hcon->pending_sec_level) |
999 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1000 | |
49c922bb | 1001 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1002 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1003 | u8 method; | |
1004 | ||
1005 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1006 | req->io_capability); | |
1007 | if (method == JUST_WORKS || method == JUST_CFM) | |
1008 | return SMP_AUTH_REQUIREMENTS; | |
1009 | } | |
1010 | ||
2b64d153 | 1011 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c | 1012 | |
65668776 JH |
1013 | if (rsp.auth_req & SMP_AUTH_SC) |
1014 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1015 | ||
3158c50c VCG |
1016 | key_size = min(req->max_key_size, rsp.max_key_size); |
1017 | if (check_enc_key_size(conn, key_size)) | |
1018 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1019 | |
e84a6b13 | 1020 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1021 | |
1c1def09 VCG |
1022 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1023 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1024 | |
3158c50c | 1025 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1026 | |
1027 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1028 | ||
1029 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { | |
1030 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1031 | /* Clear bits which are generated but not distributed */ | |
1032 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1033 | /* Wait for Public Key from Initiating Device */ | |
1034 | return 0; | |
1035 | } else { | |
1036 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1037 | } | |
da85e5e5 | 1038 | |
2b64d153 BG |
1039 | /* Request setup of TK */ |
1040 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1041 | if (ret) | |
1042 | return SMP_UNSPECIFIED; | |
1043 | ||
da85e5e5 | 1044 | return 0; |
88ba43b6 AB |
1045 | } |
1046 | ||
3b19146d JH |
1047 | static u8 sc_send_public_key(struct smp_chan *smp) |
1048 | { | |
1049 | BT_DBG(""); | |
1050 | ||
1051 | /* Generate local key pair for Secure Connections */ | |
1052 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
1053 | return SMP_UNSPECIFIED; | |
1054 | ||
1055 | BT_DBG("Local Public Key X: %32phN", smp->local_pk); | |
1056 | BT_DBG("Local Public Key Y: %32phN", &smp->local_pk[32]); | |
1057 | BT_DBG("Local Private Key: %32phN", smp->local_sk); | |
1058 | ||
1059 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
da85e5e5 | 1064 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1065 | { |
3158c50c | 1066 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1067 | struct l2cap_chan *chan = conn->smp; |
1068 | struct smp_chan *smp = chan->data; | |
0edb14de | 1069 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1070 | u8 key_size, auth; |
7d24ddcc | 1071 | int ret; |
88ba43b6 AB |
1072 | |
1073 | BT_DBG("conn %p", conn); | |
1074 | ||
c46b98be | 1075 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1076 | return SMP_INVALID_PARAMS; |
c46b98be | 1077 | |
40bef302 | 1078 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1079 | return SMP_CMD_NOTSUPP; |
1080 | ||
3158c50c VCG |
1081 | skb_pull(skb, sizeof(*rsp)); |
1082 | ||
1c1def09 | 1083 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1084 | |
3158c50c VCG |
1085 | key_size = min(req->max_key_size, rsp->max_key_size); |
1086 | if (check_enc_key_size(conn, key_size)) | |
1087 | return SMP_ENC_KEY_SIZE; | |
1088 | ||
0edb14de | 1089 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1090 | |
65668776 JH |
1091 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1092 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1093 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1094 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1095 | |
49c922bb | 1096 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1097 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1098 | u8 method; | |
1099 | ||
1100 | method = get_auth_method(smp, req->io_capability, | |
1101 | rsp->io_capability); | |
1102 | if (method == JUST_WORKS || method == JUST_CFM) | |
1103 | return SMP_AUTH_REQUIREMENTS; | |
1104 | } | |
1105 | ||
e84a6b13 | 1106 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1107 | |
8aab4757 VCG |
1108 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1109 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 1110 | |
fdcc4bec JH |
1111 | /* Update remote key distribution in case the remote cleared |
1112 | * some bits that we had enabled in our request. | |
1113 | */ | |
1114 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1115 | ||
3b19146d JH |
1116 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1117 | /* Clear bits which are generated but not distributed */ | |
1118 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1119 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1120 | return sc_send_public_key(smp); | |
1121 | } | |
1122 | ||
c05b9339 | 1123 | auth |= req->auth_req; |
2b64d153 | 1124 | |
476585ec | 1125 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1126 | if (ret) |
1127 | return SMP_UNSPECIFIED; | |
1128 | ||
4a74d658 | 1129 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1130 | |
1131 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1132 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1133 | return smp_confirm(smp); |
da85e5e5 VCG |
1134 | |
1135 | return 0; | |
88ba43b6 AB |
1136 | } |
1137 | ||
da85e5e5 | 1138 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1139 | { |
5d88cc73 JH |
1140 | struct l2cap_chan *chan = conn->smp; |
1141 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1142 | |
88ba43b6 AB |
1143 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
1144 | ||
c46b98be | 1145 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 1146 | return SMP_INVALID_PARAMS; |
c46b98be | 1147 | |
1c1def09 VCG |
1148 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
1149 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 1150 | |
b28b4943 | 1151 | if (conn->hcon->out) { |
943a732a JH |
1152 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1153 | smp->prnd); | |
b28b4943 JH |
1154 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
1155 | return 0; | |
1156 | } | |
1157 | ||
1158 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 1159 | return smp_confirm(smp); |
943a732a | 1160 | else |
4a74d658 | 1161 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
1162 | |
1163 | return 0; | |
88ba43b6 AB |
1164 | } |
1165 | ||
da85e5e5 | 1166 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1167 | { |
5d88cc73 JH |
1168 | struct l2cap_chan *chan = conn->smp; |
1169 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1170 | |
8aab4757 | 1171 | BT_DBG("conn %p", conn); |
3158c50c | 1172 | |
c46b98be | 1173 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 1174 | return SMP_INVALID_PARAMS; |
c46b98be | 1175 | |
943a732a | 1176 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 1177 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 1178 | |
861580a9 | 1179 | return smp_random(smp); |
88ba43b6 AB |
1180 | } |
1181 | ||
f81cd823 | 1182 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 1183 | { |
c9839a11 | 1184 | struct smp_ltk *key; |
988c5997 VCG |
1185 | struct hci_conn *hcon = conn->hcon; |
1186 | ||
f3a73d97 | 1187 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 1188 | if (!key) |
f81cd823 | 1189 | return false; |
988c5997 | 1190 | |
a6f7833c | 1191 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 1192 | return false; |
4dab7864 | 1193 | |
51a8efd7 | 1194 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 1195 | return true; |
988c5997 | 1196 | |
c9839a11 VCG |
1197 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
1198 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 1199 | |
fe59a05f JH |
1200 | /* We never store STKs for master role, so clear this flag */ |
1201 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
1202 | ||
f81cd823 | 1203 | return true; |
988c5997 | 1204 | } |
f1560463 | 1205 | |
35dc6f83 JH |
1206 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
1207 | enum smp_key_pref key_pref) | |
854f4727 JH |
1208 | { |
1209 | if (sec_level == BT_SECURITY_LOW) | |
1210 | return true; | |
1211 | ||
35dc6f83 JH |
1212 | /* If we're encrypted with an STK but the caller prefers using |
1213 | * LTK claim insufficient security. This way we allow the | |
1214 | * connection to be re-encrypted with an LTK, even if the LTK | |
1215 | * provides the same level of security. Only exception is if we | |
1216 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 1217 | */ |
35dc6f83 JH |
1218 | if (key_pref == SMP_USE_LTK && |
1219 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 1220 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
1221 | return false; |
1222 | ||
854f4727 JH |
1223 | if (hcon->sec_level >= sec_level) |
1224 | return true; | |
1225 | ||
1226 | return false; | |
1227 | } | |
1228 | ||
da85e5e5 | 1229 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
1230 | { |
1231 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
1232 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 1233 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 1234 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 1235 | struct smp_chan *smp; |
c05b9339 | 1236 | u8 sec_level, auth; |
88ba43b6 AB |
1237 | |
1238 | BT_DBG("conn %p", conn); | |
1239 | ||
c46b98be | 1240 | if (skb->len < sizeof(*rp)) |
38e4a915 | 1241 | return SMP_INVALID_PARAMS; |
c46b98be | 1242 | |
40bef302 | 1243 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
1244 | return SMP_CMD_NOTSUPP; |
1245 | ||
0edb14de | 1246 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1247 | |
5be5e275 | 1248 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1249 | sec_level = BT_SECURITY_MEDIUM; |
1250 | else | |
1251 | sec_level = authreq_to_seclevel(auth); | |
1252 | ||
35dc6f83 | 1253 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
854f4727 JH |
1254 | return 0; |
1255 | ||
c7262e71 JH |
1256 | if (sec_level > hcon->pending_sec_level) |
1257 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 1258 | |
4dab7864 | 1259 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
1260 | return 0; |
1261 | ||
8aab4757 | 1262 | smp = smp_chan_create(conn); |
c29d2444 JH |
1263 | if (!smp) |
1264 | return SMP_UNSPECIFIED; | |
d26a2345 | 1265 | |
b6ae8457 | 1266 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
c05b9339 | 1267 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
1268 | return SMP_PAIRING_NOTSUPP; |
1269 | ||
88ba43b6 | 1270 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 1271 | |
da85e5e5 | 1272 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 1273 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 1274 | |
1c1def09 VCG |
1275 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1276 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1277 | |
88ba43b6 | 1278 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 1279 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 1280 | |
da85e5e5 | 1281 | return 0; |
88ba43b6 AB |
1282 | } |
1283 | ||
cc110922 | 1284 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 1285 | { |
cc110922 | 1286 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 1287 | struct l2cap_chan *chan; |
0a66cf20 | 1288 | struct smp_chan *smp; |
2b64d153 | 1289 | __u8 authreq; |
fc75cc86 | 1290 | int ret; |
eb492e01 | 1291 | |
3a0259bb VCG |
1292 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
1293 | ||
0a66cf20 JH |
1294 | /* This may be NULL if there's an unexpected disconnection */ |
1295 | if (!conn) | |
1296 | return 1; | |
1297 | ||
c68b7f12 JH |
1298 | chan = conn->smp; |
1299 | ||
757aee0f | 1300 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
1301 | return 1; |
1302 | ||
35dc6f83 | 1303 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 1304 | return 1; |
f1cb9af5 | 1305 | |
c7262e71 JH |
1306 | if (sec_level > hcon->pending_sec_level) |
1307 | hcon->pending_sec_level = sec_level; | |
1308 | ||
40bef302 | 1309 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
1310 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
1311 | return 0; | |
d26a2345 | 1312 | |
fc75cc86 JH |
1313 | l2cap_chan_lock(chan); |
1314 | ||
1315 | /* If SMP is already in progress ignore this request */ | |
1316 | if (chan->data) { | |
1317 | ret = 0; | |
1318 | goto unlock; | |
1319 | } | |
d26a2345 | 1320 | |
8aab4757 | 1321 | smp = smp_chan_create(conn); |
fc75cc86 JH |
1322 | if (!smp) { |
1323 | ret = 1; | |
1324 | goto unlock; | |
1325 | } | |
2b64d153 BG |
1326 | |
1327 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 1328 | |
d2eb9e10 JH |
1329 | if (test_bit(HCI_SC_ENABLED, &hcon->hdev->dev_flags)) |
1330 | authreq |= SMP_AUTH_SC; | |
1331 | ||
79897d20 JH |
1332 | /* Require MITM if IO Capability allows or the security level |
1333 | * requires it. | |
2e233644 | 1334 | */ |
79897d20 | 1335 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 1336 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
1337 | authreq |= SMP_AUTH_MITM; |
1338 | ||
40bef302 | 1339 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 1340 | struct smp_cmd_pairing cp; |
f01ead31 | 1341 | |
2b64d153 | 1342 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
1343 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1344 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1345 | |
eb492e01 | 1346 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 1347 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
1348 | } else { |
1349 | struct smp_cmd_security_req cp; | |
2b64d153 | 1350 | cp.auth_req = authreq; |
eb492e01 | 1351 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 1352 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
1353 | } |
1354 | ||
4a74d658 | 1355 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 1356 | ret = 0; |
edca792c | 1357 | |
fc75cc86 JH |
1358 | unlock: |
1359 | l2cap_chan_unlock(chan); | |
1360 | return ret; | |
eb492e01 AB |
1361 | } |
1362 | ||
7034b911 VCG |
1363 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1364 | { | |
16b90839 | 1365 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
1366 | struct l2cap_chan *chan = conn->smp; |
1367 | struct smp_chan *smp = chan->data; | |
16b90839 | 1368 | |
c46b98be JH |
1369 | BT_DBG("conn %p", conn); |
1370 | ||
1371 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1372 | return SMP_INVALID_PARAMS; |
c46b98be | 1373 | |
b28b4943 | 1374 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 1375 | |
16b90839 VCG |
1376 | skb_pull(skb, sizeof(*rp)); |
1377 | ||
1c1def09 | 1378 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1379 | |
7034b911 VCG |
1380 | return 0; |
1381 | } | |
1382 | ||
1383 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1384 | { | |
16b90839 | 1385 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
1386 | struct l2cap_chan *chan = conn->smp; |
1387 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
1388 | struct hci_dev *hdev = conn->hcon->hdev; |
1389 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1390 | struct smp_ltk *ltk; |
c9839a11 | 1391 | u8 authenticated; |
16b90839 | 1392 | |
c46b98be JH |
1393 | BT_DBG("conn %p", conn); |
1394 | ||
1395 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1396 | return SMP_INVALID_PARAMS; |
c46b98be | 1397 | |
9747a9f3 JH |
1398 | /* Mark the information as received */ |
1399 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1400 | ||
b28b4943 JH |
1401 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
1402 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
1403 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
1404 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 1405 | |
16b90839 | 1406 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1407 | |
ce39fb4e | 1408 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1409 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1410 | authenticated, smp->tk, smp->enc_key_size, |
1411 | rp->ediv, rp->rand); | |
1412 | smp->ltk = ltk; | |
c6e81e9a | 1413 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 1414 | smp_distribute_keys(smp); |
7034b911 VCG |
1415 | |
1416 | return 0; | |
1417 | } | |
1418 | ||
fd349c02 JH |
1419 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1420 | { | |
1421 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
1422 | struct l2cap_chan *chan = conn->smp; |
1423 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1424 | |
1425 | BT_DBG(""); | |
1426 | ||
1427 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1428 | return SMP_INVALID_PARAMS; |
fd349c02 | 1429 | |
b28b4943 | 1430 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 1431 | |
fd349c02 JH |
1432 | skb_pull(skb, sizeof(*info)); |
1433 | ||
1434 | memcpy(smp->irk, info->irk, 16); | |
1435 | ||
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1440 | struct sk_buff *skb) | |
1441 | { | |
1442 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
1443 | struct l2cap_chan *chan = conn->smp; |
1444 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1445 | struct hci_conn *hcon = conn->hcon; |
1446 | bdaddr_t rpa; | |
1447 | ||
1448 | BT_DBG(""); | |
1449 | ||
1450 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1451 | return SMP_INVALID_PARAMS; |
fd349c02 | 1452 | |
9747a9f3 JH |
1453 | /* Mark the information as received */ |
1454 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1455 | ||
b28b4943 JH |
1456 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
1457 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1458 | ||
fd349c02 JH |
1459 | skb_pull(skb, sizeof(*info)); |
1460 | ||
a9a58f86 JH |
1461 | /* Strictly speaking the Core Specification (4.1) allows sending |
1462 | * an empty address which would force us to rely on just the IRK | |
1463 | * as "identity information". However, since such | |
1464 | * implementations are not known of and in order to not over | |
1465 | * complicate our implementation, simply pretend that we never | |
1466 | * received an IRK for such a device. | |
1467 | */ | |
1468 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1469 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1470 | goto distribute; |
a9a58f86 JH |
1471 | } |
1472 | ||
fd349c02 JH |
1473 | bacpy(&smp->id_addr, &info->bdaddr); |
1474 | smp->id_addr_type = info->addr_type; | |
1475 | ||
1476 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1477 | bacpy(&rpa, &hcon->dst); | |
1478 | else | |
1479 | bacpy(&rpa, BDADDR_ANY); | |
1480 | ||
23d0e128 JH |
1481 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1482 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1483 | |
31dd624e | 1484 | distribute: |
c6e81e9a JH |
1485 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
1486 | smp_distribute_keys(smp); | |
fd349c02 JH |
1487 | |
1488 | return 0; | |
1489 | } | |
1490 | ||
7ee4ea36 MH |
1491 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1492 | { | |
1493 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
1494 | struct l2cap_chan *chan = conn->smp; |
1495 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
1496 | struct smp_csrk *csrk; |
1497 | ||
1498 | BT_DBG("conn %p", conn); | |
1499 | ||
1500 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1501 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 1502 | |
7ee4ea36 MH |
1503 | /* Mark the information as received */ |
1504 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1505 | ||
1506 | skb_pull(skb, sizeof(*rp)); | |
1507 | ||
7ee4ea36 MH |
1508 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
1509 | if (csrk) { | |
1510 | csrk->master = 0x01; | |
1511 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1512 | } | |
1513 | smp->csrk = csrk; | |
d6268e86 | 1514 | smp_distribute_keys(smp); |
7ee4ea36 MH |
1515 | |
1516 | return 0; | |
1517 | } | |
1518 | ||
d8f8edbe JH |
1519 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
1520 | { | |
1521 | struct smp_cmd_public_key *key = (void *) skb->data; | |
1522 | struct hci_conn *hcon = conn->hcon; | |
1523 | struct l2cap_chan *chan = conn->smp; | |
1524 | struct smp_chan *smp = chan->data; | |
1525 | int err; | |
1526 | ||
1527 | BT_DBG("conn %p", conn); | |
1528 | ||
1529 | if (skb->len < sizeof(*key)) | |
1530 | return SMP_INVALID_PARAMS; | |
1531 | ||
1532 | memcpy(smp->remote_pk, key, 64); | |
1533 | ||
1534 | /* Non-initiating device sends its public key after receiving | |
1535 | * the key from the initiating device. | |
1536 | */ | |
1537 | if (!hcon->out) { | |
1538 | err = sc_send_public_key(smp); | |
1539 | if (err) | |
1540 | return err; | |
1541 | } | |
1542 | ||
1543 | BT_DBG("Remote Public Key X: %32phN", smp->remote_pk); | |
1544 | BT_DBG("Remote Public Key Y: %32phN", &smp->remote_pk[32]); | |
1545 | ||
1546 | if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey)) | |
1547 | return SMP_UNSPECIFIED; | |
1548 | ||
1549 | BT_DBG("DHKey %32phN", smp->dhkey); | |
1550 | ||
1551 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
1552 | ||
1553 | return 0; | |
1554 | } | |
1555 | ||
4befb867 | 1556 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 1557 | { |
5d88cc73 | 1558 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 1559 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 1560 | struct smp_chan *smp; |
92381f5c | 1561 | __u8 code, reason; |
eb492e01 AB |
1562 | int err = 0; |
1563 | ||
7b9899db MH |
1564 | if (hcon->type != LE_LINK) { |
1565 | kfree_skb(skb); | |
3432711f | 1566 | return 0; |
7b9899db MH |
1567 | } |
1568 | ||
8ae9b984 | 1569 | if (skb->len < 1) |
92381f5c | 1570 | return -EILSEQ; |
92381f5c | 1571 | |
06ae3314 | 1572 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1573 | reason = SMP_PAIRING_NOTSUPP; |
1574 | goto done; | |
1575 | } | |
1576 | ||
92381f5c | 1577 | code = skb->data[0]; |
eb492e01 AB |
1578 | skb_pull(skb, sizeof(code)); |
1579 | ||
b28b4943 JH |
1580 | smp = chan->data; |
1581 | ||
1582 | if (code > SMP_CMD_MAX) | |
1583 | goto drop; | |
1584 | ||
24bd0bd9 | 1585 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
1586 | goto drop; |
1587 | ||
1588 | /* If we don't have a context the only allowed commands are | |
1589 | * pairing request and security request. | |
8cf9fa12 | 1590 | */ |
b28b4943 JH |
1591 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
1592 | goto drop; | |
8cf9fa12 | 1593 | |
eb492e01 AB |
1594 | switch (code) { |
1595 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1596 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1597 | break; |
1598 | ||
1599 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1600 | smp_failure(conn, 0); |
da85e5e5 | 1601 | err = -EPERM; |
eb492e01 AB |
1602 | break; |
1603 | ||
1604 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1605 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1606 | break; |
1607 | ||
1608 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1609 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1610 | break; |
1611 | ||
eb492e01 | 1612 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1613 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1614 | break; |
1615 | ||
eb492e01 | 1616 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1617 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1618 | break; |
1619 | ||
eb492e01 | 1620 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1621 | reason = smp_cmd_encrypt_info(conn, skb); |
1622 | break; | |
1623 | ||
eb492e01 | 1624 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1625 | reason = smp_cmd_master_ident(conn, skb); |
1626 | break; | |
1627 | ||
eb492e01 | 1628 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1629 | reason = smp_cmd_ident_info(conn, skb); |
1630 | break; | |
1631 | ||
eb492e01 | 1632 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1633 | reason = smp_cmd_ident_addr_info(conn, skb); |
1634 | break; | |
1635 | ||
eb492e01 | 1636 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1637 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1638 | break; |
1639 | ||
d8f8edbe JH |
1640 | case SMP_CMD_PUBLIC_KEY: |
1641 | reason = smp_cmd_public_key(conn, skb); | |
1642 | break; | |
1643 | ||
eb492e01 AB |
1644 | default: |
1645 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 1646 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 1647 | goto done; |
eb492e01 AB |
1648 | } |
1649 | ||
3a0259bb | 1650 | done: |
9b7b18ef JH |
1651 | if (!err) { |
1652 | if (reason) | |
1653 | smp_failure(conn, reason); | |
8ae9b984 | 1654 | kfree_skb(skb); |
9b7b18ef JH |
1655 | } |
1656 | ||
eb492e01 | 1657 | return err; |
b28b4943 JH |
1658 | |
1659 | drop: | |
1660 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
1661 | code, &hcon->dst); | |
1662 | kfree_skb(skb); | |
1663 | return 0; | |
eb492e01 | 1664 | } |
7034b911 | 1665 | |
70db83c4 JH |
1666 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
1667 | { | |
1668 | struct l2cap_conn *conn = chan->conn; | |
1669 | ||
1670 | BT_DBG("chan %p", chan); | |
1671 | ||
fc75cc86 | 1672 | if (chan->data) |
5d88cc73 | 1673 | smp_chan_destroy(conn); |
5d88cc73 | 1674 | |
70db83c4 JH |
1675 | conn->smp = NULL; |
1676 | l2cap_chan_put(chan); | |
1677 | } | |
1678 | ||
44f1a7ab JH |
1679 | static void smp_resume_cb(struct l2cap_chan *chan) |
1680 | { | |
b68fda68 | 1681 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
1682 | struct l2cap_conn *conn = chan->conn; |
1683 | struct hci_conn *hcon = conn->hcon; | |
1684 | ||
1685 | BT_DBG("chan %p", chan); | |
1686 | ||
86d1407c JH |
1687 | if (!smp) |
1688 | return; | |
b68fda68 | 1689 | |
84bc0db5 JH |
1690 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
1691 | return; | |
1692 | ||
86d1407c JH |
1693 | cancel_delayed_work(&smp->security_timer); |
1694 | ||
d6268e86 | 1695 | smp_distribute_keys(smp); |
44f1a7ab JH |
1696 | } |
1697 | ||
70db83c4 JH |
1698 | static void smp_ready_cb(struct l2cap_chan *chan) |
1699 | { | |
1700 | struct l2cap_conn *conn = chan->conn; | |
1701 | ||
1702 | BT_DBG("chan %p", chan); | |
1703 | ||
1704 | conn->smp = chan; | |
1705 | l2cap_chan_hold(chan); | |
1706 | } | |
1707 | ||
4befb867 JH |
1708 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
1709 | { | |
1710 | int err; | |
1711 | ||
1712 | BT_DBG("chan %p", chan); | |
1713 | ||
1714 | err = smp_sig_channel(chan, skb); | |
1715 | if (err) { | |
b68fda68 | 1716 | struct smp_chan *smp = chan->data; |
4befb867 | 1717 | |
b68fda68 JH |
1718 | if (smp) |
1719 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 1720 | |
1e91c29e | 1721 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
1722 | } |
1723 | ||
1724 | return err; | |
1725 | } | |
1726 | ||
70db83c4 JH |
1727 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
1728 | unsigned long hdr_len, | |
1729 | unsigned long len, int nb) | |
1730 | { | |
1731 | struct sk_buff *skb; | |
1732 | ||
1733 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
1734 | if (!skb) | |
1735 | return ERR_PTR(-ENOMEM); | |
1736 | ||
1737 | skb->priority = HCI_PRIO_MAX; | |
1738 | bt_cb(skb)->chan = chan; | |
1739 | ||
1740 | return skb; | |
1741 | } | |
1742 | ||
1743 | static const struct l2cap_ops smp_chan_ops = { | |
1744 | .name = "Security Manager", | |
1745 | .ready = smp_ready_cb, | |
5d88cc73 | 1746 | .recv = smp_recv_cb, |
70db83c4 JH |
1747 | .alloc_skb = smp_alloc_skb_cb, |
1748 | .teardown = smp_teardown_cb, | |
44f1a7ab | 1749 | .resume = smp_resume_cb, |
70db83c4 JH |
1750 | |
1751 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
1752 | .state_change = l2cap_chan_no_state_change, |
1753 | .close = l2cap_chan_no_close, | |
1754 | .defer = l2cap_chan_no_defer, | |
1755 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
1756 | .set_shutdown = l2cap_chan_no_set_shutdown, |
1757 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1758 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1759 | }; | |
1760 | ||
1761 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
1762 | { | |
1763 | struct l2cap_chan *chan; | |
1764 | ||
1765 | BT_DBG("pchan %p", pchan); | |
1766 | ||
1767 | chan = l2cap_chan_create(); | |
1768 | if (!chan) | |
1769 | return NULL; | |
1770 | ||
1771 | chan->chan_type = pchan->chan_type; | |
1772 | chan->ops = &smp_chan_ops; | |
1773 | chan->scid = pchan->scid; | |
1774 | chan->dcid = chan->scid; | |
1775 | chan->imtu = pchan->imtu; | |
1776 | chan->omtu = pchan->omtu; | |
1777 | chan->mode = pchan->mode; | |
1778 | ||
abe84903 JH |
1779 | /* Other L2CAP channels may request SMP routines in order to |
1780 | * change the security level. This means that the SMP channel | |
1781 | * lock must be considered in its own category to avoid lockdep | |
1782 | * warnings. | |
1783 | */ | |
1784 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
1785 | ||
70db83c4 JH |
1786 | BT_DBG("created chan %p", chan); |
1787 | ||
1788 | return chan; | |
1789 | } | |
1790 | ||
1791 | static const struct l2cap_ops smp_root_chan_ops = { | |
1792 | .name = "Security Manager Root", | |
1793 | .new_connection = smp_new_conn_cb, | |
1794 | ||
1795 | /* None of these are implemented for the root channel */ | |
1796 | .close = l2cap_chan_no_close, | |
1797 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
1798 | .recv = l2cap_chan_no_recv, | |
1799 | .state_change = l2cap_chan_no_state_change, | |
1800 | .teardown = l2cap_chan_no_teardown, | |
1801 | .ready = l2cap_chan_no_ready, | |
1802 | .defer = l2cap_chan_no_defer, | |
1803 | .suspend = l2cap_chan_no_suspend, | |
1804 | .resume = l2cap_chan_no_resume, | |
1805 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1806 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1807 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1808 | }; | |
1809 | ||
711eafe3 JH |
1810 | int smp_register(struct hci_dev *hdev) |
1811 | { | |
70db83c4 | 1812 | struct l2cap_chan *chan; |
defce9e8 | 1813 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 1814 | |
711eafe3 JH |
1815 | BT_DBG("%s", hdev->name); |
1816 | ||
adae20cb | 1817 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, 0); |
defce9e8 JH |
1818 | if (IS_ERR(tfm_aes)) { |
1819 | int err = PTR_ERR(tfm_aes); | |
711eafe3 | 1820 | BT_ERR("Unable to create crypto context"); |
711eafe3 JH |
1821 | return err; |
1822 | } | |
1823 | ||
70db83c4 JH |
1824 | chan = l2cap_chan_create(); |
1825 | if (!chan) { | |
defce9e8 | 1826 | crypto_free_blkcipher(tfm_aes); |
70db83c4 JH |
1827 | return -ENOMEM; |
1828 | } | |
1829 | ||
defce9e8 JH |
1830 | chan->data = tfm_aes; |
1831 | ||
5d88cc73 | 1832 | l2cap_add_scid(chan, L2CAP_CID_SMP); |
70db83c4 JH |
1833 | |
1834 | l2cap_chan_set_defaults(chan); | |
1835 | ||
1836 | bacpy(&chan->src, &hdev->bdaddr); | |
1837 | chan->src_type = BDADDR_LE_PUBLIC; | |
1838 | chan->state = BT_LISTEN; | |
1839 | chan->mode = L2CAP_MODE_BASIC; | |
1840 | chan->imtu = L2CAP_DEFAULT_MTU; | |
1841 | chan->ops = &smp_root_chan_ops; | |
1842 | ||
abe84903 JH |
1843 | /* Set correct nesting level for a parent/listening channel */ |
1844 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
1845 | ||
70db83c4 JH |
1846 | hdev->smp_data = chan; |
1847 | ||
711eafe3 JH |
1848 | return 0; |
1849 | } | |
1850 | ||
1851 | void smp_unregister(struct hci_dev *hdev) | |
1852 | { | |
70db83c4 | 1853 | struct l2cap_chan *chan = hdev->smp_data; |
defce9e8 | 1854 | struct crypto_blkcipher *tfm_aes; |
70db83c4 JH |
1855 | |
1856 | if (!chan) | |
1857 | return; | |
1858 | ||
1859 | BT_DBG("%s chan %p", hdev->name, chan); | |
711eafe3 | 1860 | |
defce9e8 JH |
1861 | tfm_aes = chan->data; |
1862 | if (tfm_aes) { | |
1863 | chan->data = NULL; | |
1864 | crypto_free_blkcipher(tfm_aes); | |
711eafe3 | 1865 | } |
70db83c4 JH |
1866 | |
1867 | hdev->smp_data = NULL; | |
1868 | l2cap_chan_put(chan); | |
711eafe3 | 1869 | } |