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 MH |
31 | |
32 | #include "smp.h" | |
d22ef0bc | 33 | |
17b02e62 | 34 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 35 | |
065a13e2 JH |
36 | #define AUTH_REQ_MASK 0x07 |
37 | ||
533e35d4 JH |
38 | enum { |
39 | SMP_FLAG_TK_VALID, | |
40 | SMP_FLAG_CFM_PENDING, | |
41 | SMP_FLAG_MITM_AUTH, | |
42 | SMP_FLAG_COMPLETE, | |
43 | SMP_FLAG_INITIATOR, | |
44 | }; | |
4bc58f51 JH |
45 | |
46 | struct smp_chan { | |
b68fda68 JH |
47 | struct l2cap_conn *conn; |
48 | struct delayed_work security_timer; | |
49 | ||
4bc58f51 JH |
50 | u8 preq[7]; /* SMP Pairing Request */ |
51 | u8 prsp[7]; /* SMP Pairing Response */ | |
52 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
53 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
54 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
55 | u8 tk[16]; /* SMP Temporary Key */ | |
56 | u8 enc_key_size; | |
57 | u8 remote_key_dist; | |
58 | bdaddr_t id_addr; | |
59 | u8 id_addr_type; | |
60 | u8 irk[16]; | |
61 | struct smp_csrk *csrk; | |
62 | struct smp_csrk *slave_csrk; | |
63 | struct smp_ltk *ltk; | |
64 | struct smp_ltk *slave_ltk; | |
65 | struct smp_irk *remote_irk; | |
4a74d658 | 66 | unsigned long flags; |
6a7bd103 JH |
67 | |
68 | struct crypto_blkcipher *tfm_aes; | |
4bc58f51 JH |
69 | }; |
70 | ||
8a2936f4 | 71 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 72 | { |
8a2936f4 | 73 | size_t i; |
d22ef0bc | 74 | |
8a2936f4 JH |
75 | for (i = 0; i < len; i++) |
76 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
77 | } |
78 | ||
79 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
80 | { | |
81 | struct blkcipher_desc desc; | |
82 | struct scatterlist sg; | |
943a732a | 83 | uint8_t tmp[16], data[16]; |
201a5929 | 84 | int err; |
d22ef0bc AB |
85 | |
86 | if (tfm == NULL) { | |
87 | BT_ERR("tfm %p", tfm); | |
88 | return -EINVAL; | |
89 | } | |
90 | ||
91 | desc.tfm = tfm; | |
92 | desc.flags = 0; | |
93 | ||
943a732a | 94 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 95 | swap_buf(k, tmp, 16); |
943a732a JH |
96 | |
97 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
98 | if (err) { |
99 | BT_ERR("cipher setkey failed: %d", err); | |
100 | return err; | |
101 | } | |
102 | ||
943a732a | 103 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 104 | swap_buf(r, data, 16); |
943a732a JH |
105 | |
106 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 107 | |
d22ef0bc AB |
108 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
109 | if (err) | |
110 | BT_ERR("Encrypt data error %d", err); | |
111 | ||
943a732a | 112 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 113 | swap_buf(data, r, 16); |
943a732a | 114 | |
d22ef0bc AB |
115 | return err; |
116 | } | |
117 | ||
60478054 JH |
118 | static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3]) |
119 | { | |
943a732a | 120 | u8 _res[16]; |
60478054 JH |
121 | int err; |
122 | ||
123 | /* r' = padding || r */ | |
943a732a JH |
124 | memcpy(_res, r, 3); |
125 | memset(_res + 3, 0, 13); | |
60478054 | 126 | |
943a732a | 127 | err = smp_e(tfm, irk, _res); |
60478054 JH |
128 | if (err) { |
129 | BT_ERR("Encrypt error"); | |
130 | return err; | |
131 | } | |
132 | ||
133 | /* The output of the random address function ah is: | |
134 | * ah(h, r) = e(k, r') mod 2^24 | |
135 | * The output of the security function e is then truncated to 24 bits | |
136 | * by taking the least significant 24 bits of the output of e as the | |
137 | * result of ah. | |
138 | */ | |
943a732a | 139 | memcpy(res, _res, 3); |
60478054 JH |
140 | |
141 | return 0; | |
142 | } | |
143 | ||
defce9e8 | 144 | bool smp_irk_matches(struct hci_dev *hdev, u8 irk[16], bdaddr_t *bdaddr) |
60478054 | 145 | { |
defce9e8 JH |
146 | struct l2cap_chan *chan = hdev->smp_data; |
147 | struct crypto_blkcipher *tfm; | |
60478054 JH |
148 | u8 hash[3]; |
149 | int err; | |
150 | ||
defce9e8 JH |
151 | if (!chan || !chan->data) |
152 | return false; | |
153 | ||
154 | tfm = chan->data; | |
155 | ||
60478054 JH |
156 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
157 | ||
158 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
159 | if (err) | |
160 | return false; | |
161 | ||
162 | return !memcmp(bdaddr->b, hash, 3); | |
163 | } | |
164 | ||
defce9e8 | 165 | int smp_generate_rpa(struct hci_dev *hdev, u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 166 | { |
defce9e8 JH |
167 | struct l2cap_chan *chan = hdev->smp_data; |
168 | struct crypto_blkcipher *tfm; | |
b1e2b3ae JH |
169 | int err; |
170 | ||
defce9e8 JH |
171 | if (!chan || !chan->data) |
172 | return -EOPNOTSUPP; | |
173 | ||
174 | tfm = chan->data; | |
175 | ||
b1e2b3ae JH |
176 | get_random_bytes(&rpa->b[3], 3); |
177 | ||
178 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
179 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
180 | ||
181 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
182 | if (err < 0) | |
183 | return err; | |
184 | ||
185 | BT_DBG("RPA %pMR", rpa); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
ec70f36f JH |
190 | static int smp_c1(struct smp_chan *smp, u8 k[16], u8 r[16], u8 preq[7], |
191 | u8 pres[7], u8 _iat, bdaddr_t *ia, u8 _rat, bdaddr_t *ra, | |
192 | u8 res[16]) | |
d22ef0bc | 193 | { |
ec70f36f | 194 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
d22ef0bc AB |
195 | u8 p1[16], p2[16]; |
196 | int err; | |
197 | ||
ec70f36f JH |
198 | BT_DBG("%s", hdev->name); |
199 | ||
d22ef0bc AB |
200 | memset(p1, 0, 16); |
201 | ||
202 | /* p1 = pres || preq || _rat || _iat */ | |
943a732a JH |
203 | p1[0] = _iat; |
204 | p1[1] = _rat; | |
205 | memcpy(p1 + 2, preq, 7); | |
206 | memcpy(p1 + 9, pres, 7); | |
d22ef0bc AB |
207 | |
208 | /* p2 = padding || ia || ra */ | |
943a732a JH |
209 | memcpy(p2, ra, 6); |
210 | memcpy(p2 + 6, ia, 6); | |
211 | memset(p2 + 12, 0, 4); | |
d22ef0bc AB |
212 | |
213 | /* res = r XOR p1 */ | |
214 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
215 | ||
216 | /* res = e(k, res) */ | |
ec70f36f | 217 | err = smp_e(smp->tfm_aes, k, res); |
d22ef0bc AB |
218 | if (err) { |
219 | BT_ERR("Encrypt data error"); | |
220 | return err; | |
221 | } | |
222 | ||
223 | /* res = res XOR p2 */ | |
224 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
225 | ||
226 | /* res = e(k, res) */ | |
ec70f36f | 227 | err = smp_e(smp->tfm_aes, k, res); |
d22ef0bc AB |
228 | if (err) |
229 | BT_ERR("Encrypt data error"); | |
230 | ||
231 | return err; | |
232 | } | |
233 | ||
ec70f36f JH |
234 | static int smp_s1(struct smp_chan *smp, u8 k[16], u8 r1[16], u8 r2[16], |
235 | u8 _r[16]) | |
d22ef0bc | 236 | { |
ec70f36f | 237 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
d22ef0bc AB |
238 | int err; |
239 | ||
ec70f36f JH |
240 | BT_DBG("%s", hdev->name); |
241 | ||
d22ef0bc | 242 | /* Just least significant octets from r1 and r2 are considered */ |
943a732a JH |
243 | memcpy(_r, r2, 8); |
244 | memcpy(_r + 8, r1, 8); | |
d22ef0bc | 245 | |
ec70f36f | 246 | err = smp_e(smp->tfm_aes, k, _r); |
d22ef0bc AB |
247 | if (err) |
248 | BT_ERR("Encrypt data error"); | |
249 | ||
250 | return err; | |
251 | } | |
252 | ||
5d88cc73 | 253 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 254 | { |
5d88cc73 | 255 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 256 | struct smp_chan *smp; |
5d88cc73 JH |
257 | struct kvec iv[2]; |
258 | struct msghdr msg; | |
eb492e01 | 259 | |
5d88cc73 JH |
260 | if (!chan) |
261 | return; | |
eb492e01 | 262 | |
5d88cc73 | 263 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 264 | |
5d88cc73 JH |
265 | iv[0].iov_base = &code; |
266 | iv[0].iov_len = 1; | |
eb492e01 | 267 | |
5d88cc73 JH |
268 | iv[1].iov_base = data; |
269 | iv[1].iov_len = len; | |
eb492e01 | 270 | |
5d88cc73 | 271 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 272 | |
5d88cc73 JH |
273 | msg.msg_iov = (struct iovec *) &iv; |
274 | msg.msg_iovlen = 2; | |
eb492e01 | 275 | |
5d88cc73 | 276 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 277 | |
b68fda68 JH |
278 | if (!chan->data) |
279 | return; | |
280 | ||
281 | smp = chan->data; | |
282 | ||
283 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 284 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
285 | } |
286 | ||
2b64d153 BG |
287 | static __u8 authreq_to_seclevel(__u8 authreq) |
288 | { | |
289 | if (authreq & SMP_AUTH_MITM) | |
290 | return BT_SECURITY_HIGH; | |
291 | else | |
292 | return BT_SECURITY_MEDIUM; | |
293 | } | |
294 | ||
295 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
296 | { | |
297 | switch (sec_level) { | |
298 | case BT_SECURITY_HIGH: | |
299 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
300 | case BT_SECURITY_MEDIUM: | |
301 | return SMP_AUTH_BONDING; | |
302 | default: | |
303 | return SMP_AUTH_NONE; | |
304 | } | |
305 | } | |
306 | ||
b8e66eac | 307 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
308 | struct smp_cmd_pairing *req, |
309 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 310 | { |
5d88cc73 JH |
311 | struct l2cap_chan *chan = conn->smp; |
312 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
313 | struct hci_conn *hcon = conn->hcon; |
314 | struct hci_dev *hdev = hcon->hdev; | |
315 | u8 local_dist = 0, remote_dist = 0; | |
54790f73 | 316 | |
b6ae8457 | 317 | if (test_bit(HCI_BONDABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
318 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
319 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 320 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
321 | } else { |
322 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
323 | } |
324 | ||
fd349c02 JH |
325 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
326 | remote_dist |= SMP_DIST_ID_KEY; | |
327 | ||
863efaf2 JH |
328 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
329 | local_dist |= SMP_DIST_ID_KEY; | |
330 | ||
54790f73 VCG |
331 | if (rsp == NULL) { |
332 | req->io_capability = conn->hcon->io_capability; | |
333 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
334 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
335 | req->init_key_dist = local_dist; |
336 | req->resp_key_dist = remote_dist; | |
065a13e2 | 337 | req->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
338 | |
339 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
340 | return; |
341 | } | |
342 | ||
343 | rsp->io_capability = conn->hcon->io_capability; | |
344 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
345 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
346 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
347 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
065a13e2 | 348 | rsp->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
349 | |
350 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
351 | } |
352 | ||
3158c50c VCG |
353 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
354 | { | |
5d88cc73 JH |
355 | struct l2cap_chan *chan = conn->smp; |
356 | struct smp_chan *smp = chan->data; | |
1c1def09 | 357 | |
3158c50c | 358 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 359 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
360 | return SMP_ENC_KEY_SIZE; |
361 | ||
f7aa611a | 362 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
363 | |
364 | return 0; | |
365 | } | |
366 | ||
6f48e260 JH |
367 | static void smp_chan_destroy(struct l2cap_conn *conn) |
368 | { | |
369 | struct l2cap_chan *chan = conn->smp; | |
370 | struct smp_chan *smp = chan->data; | |
371 | bool complete; | |
372 | ||
373 | BUG_ON(!smp); | |
374 | ||
375 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 376 | |
6f48e260 JH |
377 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
378 | mgmt_smp_complete(conn->hcon, complete); | |
379 | ||
380 | kfree(smp->csrk); | |
381 | kfree(smp->slave_csrk); | |
382 | ||
383 | crypto_free_blkcipher(smp->tfm_aes); | |
384 | ||
385 | /* If pairing failed clean up any keys we might have */ | |
386 | if (!complete) { | |
387 | if (smp->ltk) { | |
388 | list_del(&smp->ltk->list); | |
389 | kfree(smp->ltk); | |
390 | } | |
391 | ||
392 | if (smp->slave_ltk) { | |
393 | list_del(&smp->slave_ltk->list); | |
394 | kfree(smp->slave_ltk); | |
395 | } | |
396 | ||
397 | if (smp->remote_irk) { | |
398 | list_del(&smp->remote_irk->list); | |
399 | kfree(smp->remote_irk); | |
400 | } | |
401 | } | |
402 | ||
403 | chan->data = NULL; | |
404 | kfree(smp); | |
405 | hci_conn_drop(conn->hcon); | |
406 | } | |
407 | ||
84794e11 | 408 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 409 | { |
bab73cb6 | 410 | struct hci_conn *hcon = conn->hcon; |
b68fda68 JH |
411 | struct l2cap_chan *chan = conn->smp; |
412 | struct smp_chan *smp; | |
bab73cb6 | 413 | |
84794e11 | 414 | if (reason) |
4f957a76 | 415 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 416 | &reason); |
4f957a76 | 417 | |
ce39fb4e MH |
418 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
419 | mgmt_auth_failed(hcon->hdev, &hcon->dst, hcon->type, hcon->dst_type, | |
420 | HCI_ERROR_AUTH_FAILURE); | |
f1c09c07 | 421 | |
b68fda68 JH |
422 | if (!chan->data) |
423 | return; | |
424 | ||
425 | smp = chan->data; | |
426 | ||
ce39fb4e | 427 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
f1c09c07 | 428 | smp_chan_destroy(conn); |
4f957a76 BG |
429 | } |
430 | ||
2b64d153 BG |
431 | #define JUST_WORKS 0x00 |
432 | #define JUST_CFM 0x01 | |
433 | #define REQ_PASSKEY 0x02 | |
434 | #define CFM_PASSKEY 0x03 | |
435 | #define REQ_OOB 0x04 | |
436 | #define OVERLAP 0xFF | |
437 | ||
438 | static const u8 gen_method[5][5] = { | |
439 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
440 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
441 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
442 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
443 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
444 | }; | |
445 | ||
581370cc JH |
446 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
447 | { | |
2bcd4003 JH |
448 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
449 | * converted later to JUST_WORKS if we're initiators. | |
450 | */ | |
581370cc JH |
451 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
452 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 453 | return JUST_CFM; |
581370cc JH |
454 | |
455 | return gen_method[remote_io][local_io]; | |
456 | } | |
457 | ||
2b64d153 BG |
458 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
459 | u8 local_io, u8 remote_io) | |
460 | { | |
461 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
462 | struct l2cap_chan *chan = conn->smp; |
463 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
464 | u8 method; |
465 | u32 passkey = 0; | |
466 | int ret = 0; | |
467 | ||
468 | /* Initialize key for JUST WORKS */ | |
469 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 470 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
471 | |
472 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
473 | ||
2bcd4003 JH |
474 | /* If neither side wants MITM, either "just" confirm an incoming |
475 | * request or use just-works for outgoing ones. The JUST_CFM | |
476 | * will be converted to JUST_WORKS if necessary later in this | |
477 | * function. If either side has MITM look up the method from the | |
478 | * table. | |
479 | */ | |
581370cc | 480 | if (!(auth & SMP_AUTH_MITM)) |
2bcd4003 | 481 | method = JUST_CFM; |
2b64d153 | 482 | else |
581370cc | 483 | method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 484 | |
a82505c7 | 485 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 486 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
487 | method = JUST_WORKS; |
488 | ||
02f3e254 JH |
489 | /* Don't bother user space with no IO capabilities */ |
490 | if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
491 | method = JUST_WORKS; | |
492 | ||
2b64d153 BG |
493 | /* If Just Works, Continue with Zero TK */ |
494 | if (method == JUST_WORKS) { | |
4a74d658 | 495 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
496 | return 0; |
497 | } | |
498 | ||
499 | /* Not Just Works/Confirm results in MITM Authentication */ | |
500 | if (method != JUST_CFM) | |
4a74d658 | 501 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
2b64d153 BG |
502 | |
503 | /* If both devices have Keyoard-Display I/O, the master | |
504 | * Confirms and the slave Enters the passkey. | |
505 | */ | |
506 | if (method == OVERLAP) { | |
40bef302 | 507 | if (hcon->role == HCI_ROLE_MASTER) |
2b64d153 BG |
508 | method = CFM_PASSKEY; |
509 | else | |
510 | method = REQ_PASSKEY; | |
511 | } | |
512 | ||
01ad34d2 | 513 | /* Generate random passkey. */ |
2b64d153 | 514 | if (method == CFM_PASSKEY) { |
943a732a | 515 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
516 | get_random_bytes(&passkey, sizeof(passkey)); |
517 | passkey %= 1000000; | |
943a732a | 518 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 519 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 520 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
521 | } |
522 | ||
523 | hci_dev_lock(hcon->hdev); | |
524 | ||
525 | if (method == REQ_PASSKEY) | |
ce39fb4e | 526 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 527 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
528 | else if (method == JUST_CFM) |
529 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
530 | hcon->type, hcon->dst_type, | |
531 | passkey, 1); | |
2b64d153 | 532 | else |
01ad34d2 | 533 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 534 | hcon->type, hcon->dst_type, |
39adbffe | 535 | passkey, 0); |
2b64d153 BG |
536 | |
537 | hci_dev_unlock(hcon->hdev); | |
538 | ||
539 | return ret; | |
540 | } | |
541 | ||
1cc61144 | 542 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 543 | { |
8aab4757 | 544 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
545 | struct smp_cmd_pairing_confirm cp; |
546 | int ret; | |
8aab4757 VCG |
547 | |
548 | BT_DBG("conn %p", conn); | |
549 | ||
ec70f36f | 550 | ret = smp_c1(smp, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 551 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
552 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
553 | cp.confirm_val); | |
1cc61144 JH |
554 | if (ret) |
555 | return SMP_UNSPECIFIED; | |
8aab4757 | 556 | |
4a74d658 | 557 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 558 | |
8aab4757 VCG |
559 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
560 | ||
1cc61144 | 561 | return 0; |
8aab4757 VCG |
562 | } |
563 | ||
861580a9 | 564 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 565 | { |
8aab4757 VCG |
566 | struct l2cap_conn *conn = smp->conn; |
567 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 568 | u8 confirm[16]; |
8aab4757 VCG |
569 | int ret; |
570 | ||
ec70f36f | 571 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 572 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
573 | |
574 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
575 | ||
ec70f36f | 576 | ret = smp_c1(smp, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 577 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 578 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
579 | if (ret) |
580 | return SMP_UNSPECIFIED; | |
8aab4757 | 581 | |
8aab4757 VCG |
582 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
583 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 584 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
585 | } |
586 | ||
587 | if (hcon->out) { | |
fe39c7b2 MH |
588 | u8 stk[16]; |
589 | __le64 rand = 0; | |
590 | __le16 ediv = 0; | |
8aab4757 | 591 | |
ec70f36f | 592 | smp_s1(smp, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 593 | |
f7aa611a | 594 | memset(stk + smp->enc_key_size, 0, |
04124681 | 595 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 596 | |
861580a9 JH |
597 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
598 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
599 | |
600 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 601 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 602 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 603 | } else { |
fff3490f | 604 | u8 stk[16], auth; |
fe39c7b2 MH |
605 | __le64 rand = 0; |
606 | __le16 ediv = 0; | |
8aab4757 | 607 | |
943a732a JH |
608 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
609 | smp->prnd); | |
8aab4757 | 610 | |
ec70f36f | 611 | smp_s1(smp, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 612 | |
f7aa611a | 613 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 614 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 615 | |
fff3490f JH |
616 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
617 | auth = 1; | |
618 | else | |
619 | auth = 0; | |
620 | ||
7d5843b7 JH |
621 | /* Even though there's no _SLAVE suffix this is the |
622 | * slave STK we're adding for later lookup (the master | |
623 | * STK never needs to be stored). | |
624 | */ | |
ce39fb4e | 625 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 626 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
627 | } |
628 | ||
861580a9 | 629 | return 0; |
8aab4757 VCG |
630 | } |
631 | ||
44f1a7ab JH |
632 | static void smp_notify_keys(struct l2cap_conn *conn) |
633 | { | |
634 | struct l2cap_chan *chan = conn->smp; | |
635 | struct smp_chan *smp = chan->data; | |
636 | struct hci_conn *hcon = conn->hcon; | |
637 | struct hci_dev *hdev = hcon->hdev; | |
638 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
639 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
640 | bool persistent; | |
641 | ||
642 | if (smp->remote_irk) { | |
643 | mgmt_new_irk(hdev, smp->remote_irk); | |
644 | /* Now that user space can be considered to know the | |
645 | * identity address track the connection based on it | |
646 | * from now on. | |
647 | */ | |
648 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
649 | hcon->dst_type = smp->remote_irk->addr_type; | |
f3d82d0c | 650 | queue_work(hdev->workqueue, &conn->id_addr_update_work); |
44f1a7ab JH |
651 | |
652 | /* When receiving an indentity resolving key for | |
653 | * a remote device that does not use a resolvable | |
654 | * private address, just remove the key so that | |
655 | * it is possible to use the controller white | |
656 | * list for scanning. | |
657 | * | |
658 | * Userspace will have been told to not store | |
659 | * this key at this point. So it is safe to | |
660 | * just remove it. | |
661 | */ | |
662 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
663 | list_del(&smp->remote_irk->list); | |
664 | kfree(smp->remote_irk); | |
665 | smp->remote_irk = NULL; | |
666 | } | |
667 | } | |
668 | ||
669 | /* The LTKs and CSRKs should be persistent only if both sides | |
670 | * had the bonding bit set in their authentication requests. | |
671 | */ | |
672 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
673 | ||
674 | if (smp->csrk) { | |
675 | smp->csrk->bdaddr_type = hcon->dst_type; | |
676 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
677 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
678 | } | |
679 | ||
680 | if (smp->slave_csrk) { | |
681 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
682 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
683 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
684 | } | |
685 | ||
686 | if (smp->ltk) { | |
687 | smp->ltk->bdaddr_type = hcon->dst_type; | |
688 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
689 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
690 | } | |
691 | ||
692 | if (smp->slave_ltk) { | |
693 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
694 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
695 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
696 | } | |
697 | } | |
698 | ||
d6268e86 | 699 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
700 | { |
701 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 702 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
703 | struct hci_conn *hcon = conn->hcon; |
704 | struct hci_dev *hdev = hcon->hdev; | |
705 | __u8 *keydist; | |
706 | ||
707 | BT_DBG("conn %p", conn); | |
708 | ||
709 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) | |
86d1407c | 710 | return; |
44f1a7ab JH |
711 | |
712 | rsp = (void *) &smp->prsp[1]; | |
713 | ||
714 | /* The responder sends its keys first */ | |
715 | if (hcon->out && (smp->remote_key_dist & 0x07)) | |
86d1407c | 716 | return; |
44f1a7ab JH |
717 | |
718 | req = (void *) &smp->preq[1]; | |
719 | ||
720 | if (hcon->out) { | |
721 | keydist = &rsp->init_key_dist; | |
722 | *keydist &= req->init_key_dist; | |
723 | } else { | |
724 | keydist = &rsp->resp_key_dist; | |
725 | *keydist &= req->resp_key_dist; | |
726 | } | |
727 | ||
728 | BT_DBG("keydist 0x%x", *keydist); | |
729 | ||
730 | if (*keydist & SMP_DIST_ENC_KEY) { | |
731 | struct smp_cmd_encrypt_info enc; | |
732 | struct smp_cmd_master_ident ident; | |
733 | struct smp_ltk *ltk; | |
734 | u8 authenticated; | |
735 | __le16 ediv; | |
736 | __le64 rand; | |
737 | ||
738 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
739 | get_random_bytes(&ediv, sizeof(ediv)); | |
740 | get_random_bytes(&rand, sizeof(rand)); | |
741 | ||
742 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
743 | ||
744 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
745 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
746 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
747 | smp->enc_key_size, ediv, rand); | |
748 | smp->slave_ltk = ltk; | |
749 | ||
750 | ident.ediv = ediv; | |
751 | ident.rand = rand; | |
752 | ||
753 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
754 | ||
755 | *keydist &= ~SMP_DIST_ENC_KEY; | |
756 | } | |
757 | ||
758 | if (*keydist & SMP_DIST_ID_KEY) { | |
759 | struct smp_cmd_ident_addr_info addrinfo; | |
760 | struct smp_cmd_ident_info idinfo; | |
761 | ||
762 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
763 | ||
764 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
765 | ||
766 | /* The hci_conn contains the local identity address | |
767 | * after the connection has been established. | |
768 | * | |
769 | * This is true even when the connection has been | |
770 | * established using a resolvable random address. | |
771 | */ | |
772 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
773 | addrinfo.addr_type = hcon->src_type; | |
774 | ||
775 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
776 | &addrinfo); | |
777 | ||
778 | *keydist &= ~SMP_DIST_ID_KEY; | |
779 | } | |
780 | ||
781 | if (*keydist & SMP_DIST_SIGN) { | |
782 | struct smp_cmd_sign_info sign; | |
783 | struct smp_csrk *csrk; | |
784 | ||
785 | /* Generate a new random key */ | |
786 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
787 | ||
788 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
789 | if (csrk) { | |
790 | csrk->master = 0x00; | |
791 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
792 | } | |
793 | smp->slave_csrk = csrk; | |
794 | ||
795 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
796 | ||
797 | *keydist &= ~SMP_DIST_SIGN; | |
798 | } | |
799 | ||
800 | /* If there are still keys to be received wait for them */ | |
801 | if ((smp->remote_key_dist & 0x07)) | |
86d1407c | 802 | return; |
44f1a7ab JH |
803 | |
804 | clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags); | |
44f1a7ab JH |
805 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
806 | smp_notify_keys(conn); | |
807 | ||
808 | smp_chan_destroy(conn); | |
44f1a7ab JH |
809 | } |
810 | ||
b68fda68 JH |
811 | static void smp_timeout(struct work_struct *work) |
812 | { | |
813 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
814 | security_timer.work); | |
815 | struct l2cap_conn *conn = smp->conn; | |
816 | ||
817 | BT_DBG("conn %p", conn); | |
818 | ||
1e91c29e | 819 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
820 | } |
821 | ||
8aab4757 VCG |
822 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
823 | { | |
5d88cc73 | 824 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
825 | struct smp_chan *smp; |
826 | ||
f1560463 | 827 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
616d55be JH |
828 | if (!smp) { |
829 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); | |
8aab4757 | 830 | return NULL; |
616d55be | 831 | } |
8aab4757 | 832 | |
6a7bd103 JH |
833 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
834 | if (IS_ERR(smp->tfm_aes)) { | |
835 | BT_ERR("Unable to create ECB crypto context"); | |
836 | kfree(smp); | |
616d55be | 837 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); |
6a7bd103 JH |
838 | return NULL; |
839 | } | |
840 | ||
8aab4757 | 841 | smp->conn = conn; |
5d88cc73 | 842 | chan->data = smp; |
8aab4757 | 843 | |
b68fda68 JH |
844 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
845 | ||
8aab4757 VCG |
846 | hci_conn_hold(conn->hcon); |
847 | ||
848 | return smp; | |
849 | } | |
850 | ||
2b64d153 BG |
851 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
852 | { | |
b10e8017 | 853 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 854 | struct l2cap_chan *chan; |
2b64d153 BG |
855 | struct smp_chan *smp; |
856 | u32 value; | |
2b64d153 BG |
857 | |
858 | BT_DBG(""); | |
859 | ||
642ac774 | 860 | if (!conn || !test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
2b64d153 BG |
861 | return -ENOTCONN; |
862 | ||
5d88cc73 JH |
863 | chan = conn->smp; |
864 | if (!chan) | |
865 | return -ENOTCONN; | |
866 | ||
867 | smp = chan->data; | |
2b64d153 BG |
868 | |
869 | switch (mgmt_op) { | |
870 | case MGMT_OP_USER_PASSKEY_REPLY: | |
871 | value = le32_to_cpu(passkey); | |
943a732a | 872 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 873 | BT_DBG("PassKey: %d", value); |
943a732a | 874 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
875 | /* Fall Through */ |
876 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 877 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
878 | break; |
879 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
880 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 881 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
882 | return 0; |
883 | default: | |
84794e11 | 884 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
885 | return -EOPNOTSUPP; |
886 | } | |
887 | ||
888 | /* If it is our turn to send Pairing Confirm, do so now */ | |
1cc61144 JH |
889 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
890 | u8 rsp = smp_confirm(smp); | |
891 | if (rsp) | |
892 | smp_failure(conn, rsp); | |
893 | } | |
2b64d153 BG |
894 | |
895 | return 0; | |
896 | } | |
897 | ||
da85e5e5 | 898 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 899 | { |
3158c50c | 900 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
b3c6410b | 901 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 902 | struct smp_chan *smp; |
c7262e71 | 903 | u8 key_size, auth, sec_level; |
8aab4757 | 904 | int ret; |
88ba43b6 AB |
905 | |
906 | BT_DBG("conn %p", conn); | |
907 | ||
c46b98be | 908 | if (skb->len < sizeof(*req)) |
38e4a915 | 909 | return SMP_INVALID_PARAMS; |
c46b98be | 910 | |
40bef302 | 911 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
912 | return SMP_CMD_NOTSUPP; |
913 | ||
5d88cc73 | 914 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) { |
8aab4757 | 915 | smp = smp_chan_create(conn); |
5d88cc73 JH |
916 | } else { |
917 | struct l2cap_chan *chan = conn->smp; | |
918 | smp = chan->data; | |
919 | } | |
8aab4757 | 920 | |
d08fd0e7 AE |
921 | if (!smp) |
922 | return SMP_UNSPECIFIED; | |
d26a2345 | 923 | |
b6ae8457 | 924 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
b3c6410b JH |
925 | (req->auth_req & SMP_AUTH_BONDING)) |
926 | return SMP_PAIRING_NOTSUPP; | |
927 | ||
1c1def09 VCG |
928 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
929 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 930 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 931 | |
2b64d153 | 932 | /* We didn't start the pairing, so match remote */ |
1ef35827 | 933 | auth = req->auth_req; |
da85e5e5 | 934 | |
c7262e71 JH |
935 | sec_level = authreq_to_seclevel(auth); |
936 | if (sec_level > conn->hcon->pending_sec_level) | |
937 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 938 | |
2ed8f65c JH |
939 | /* If we need MITM check that it can be acheived */ |
940 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
941 | u8 method; | |
942 | ||
943 | method = get_auth_method(smp, conn->hcon->io_capability, | |
944 | req->io_capability); | |
945 | if (method == JUST_WORKS || method == JUST_CFM) | |
946 | return SMP_AUTH_REQUIREMENTS; | |
947 | } | |
948 | ||
2b64d153 | 949 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
950 | |
951 | key_size = min(req->max_key_size, rsp.max_key_size); | |
952 | if (check_enc_key_size(conn, key_size)) | |
953 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 954 | |
e84a6b13 | 955 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 956 | |
1c1def09 VCG |
957 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
958 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 959 | |
3158c50c | 960 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 961 | |
2b64d153 BG |
962 | /* Request setup of TK */ |
963 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
964 | if (ret) | |
965 | return SMP_UNSPECIFIED; | |
966 | ||
da85e5e5 | 967 | return 0; |
88ba43b6 AB |
968 | } |
969 | ||
da85e5e5 | 970 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 971 | { |
3158c50c | 972 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
973 | struct l2cap_chan *chan = conn->smp; |
974 | struct smp_chan *smp = chan->data; | |
2b64d153 | 975 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 976 | int ret; |
88ba43b6 AB |
977 | |
978 | BT_DBG("conn %p", conn); | |
979 | ||
c46b98be | 980 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 981 | return SMP_INVALID_PARAMS; |
c46b98be | 982 | |
40bef302 | 983 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
984 | return SMP_CMD_NOTSUPP; |
985 | ||
3158c50c VCG |
986 | skb_pull(skb, sizeof(*rsp)); |
987 | ||
1c1def09 | 988 | req = (void *) &smp->preq[1]; |
da85e5e5 | 989 | |
3158c50c VCG |
990 | key_size = min(req->max_key_size, rsp->max_key_size); |
991 | if (check_enc_key_size(conn, key_size)) | |
992 | return SMP_ENC_KEY_SIZE; | |
993 | ||
2ed8f65c JH |
994 | /* If we need MITM check that it can be acheived */ |
995 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
996 | u8 method; | |
997 | ||
998 | method = get_auth_method(smp, req->io_capability, | |
999 | rsp->io_capability); | |
1000 | if (method == JUST_WORKS || method == JUST_CFM) | |
1001 | return SMP_AUTH_REQUIREMENTS; | |
1002 | } | |
1003 | ||
e84a6b13 | 1004 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1005 | |
8aab4757 VCG |
1006 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1007 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 1008 | |
fdcc4bec JH |
1009 | /* Update remote key distribution in case the remote cleared |
1010 | * some bits that we had enabled in our request. | |
1011 | */ | |
1012 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1013 | ||
2b64d153 | 1014 | if ((req->auth_req & SMP_AUTH_BONDING) && |
f1560463 | 1015 | (rsp->auth_req & SMP_AUTH_BONDING)) |
2b64d153 BG |
1016 | auth = SMP_AUTH_BONDING; |
1017 | ||
1018 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
1019 | ||
476585ec | 1020 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1021 | if (ret) |
1022 | return SMP_UNSPECIFIED; | |
1023 | ||
4a74d658 | 1024 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1025 | |
1026 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1027 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1028 | return smp_confirm(smp); |
da85e5e5 VCG |
1029 | |
1030 | return 0; | |
88ba43b6 AB |
1031 | } |
1032 | ||
da85e5e5 | 1033 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1034 | { |
5d88cc73 JH |
1035 | struct l2cap_chan *chan = conn->smp; |
1036 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1037 | |
88ba43b6 AB |
1038 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
1039 | ||
c46b98be | 1040 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 1041 | return SMP_INVALID_PARAMS; |
c46b98be | 1042 | |
1c1def09 VCG |
1043 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
1044 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 1045 | |
943a732a JH |
1046 | if (conn->hcon->out) |
1047 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1048 | smp->prnd); | |
4a74d658 | 1049 | else if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1050 | return smp_confirm(smp); |
943a732a | 1051 | else |
4a74d658 | 1052 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
1053 | |
1054 | return 0; | |
88ba43b6 AB |
1055 | } |
1056 | ||
da85e5e5 | 1057 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1058 | { |
5d88cc73 JH |
1059 | struct l2cap_chan *chan = conn->smp; |
1060 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1061 | |
8aab4757 | 1062 | BT_DBG("conn %p", conn); |
3158c50c | 1063 | |
c46b98be | 1064 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 1065 | return SMP_INVALID_PARAMS; |
c46b98be | 1066 | |
943a732a | 1067 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 1068 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 1069 | |
861580a9 | 1070 | return smp_random(smp); |
88ba43b6 AB |
1071 | } |
1072 | ||
f81cd823 | 1073 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 1074 | { |
c9839a11 | 1075 | struct smp_ltk *key; |
988c5997 VCG |
1076 | struct hci_conn *hcon = conn->hcon; |
1077 | ||
98a0b845 | 1078 | key = hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, |
e804d25d | 1079 | hcon->role); |
988c5997 | 1080 | if (!key) |
f81cd823 | 1081 | return false; |
988c5997 | 1082 | |
4dab7864 | 1083 | if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) |
f81cd823 | 1084 | return false; |
4dab7864 | 1085 | |
51a8efd7 | 1086 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 1087 | return true; |
988c5997 | 1088 | |
c9839a11 VCG |
1089 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
1090 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 1091 | |
fe59a05f JH |
1092 | /* We never store STKs for master role, so clear this flag */ |
1093 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
1094 | ||
f81cd823 | 1095 | return true; |
988c5997 | 1096 | } |
f1560463 | 1097 | |
854f4727 JH |
1098 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level) |
1099 | { | |
1100 | if (sec_level == BT_SECURITY_LOW) | |
1101 | return true; | |
1102 | ||
9ab65d60 JH |
1103 | /* If we're encrypted with an STK always claim insufficient |
1104 | * security. This way we allow the connection to be re-encrypted | |
1105 | * with an LTK, even if the LTK provides the same level of | |
b2d5e254 JH |
1106 | * security. Only exception is if we don't have an LTK (e.g. |
1107 | * because of key distribution bits). | |
9ab65d60 | 1108 | */ |
b2d5e254 JH |
1109 | if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && |
1110 | hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, | |
e804d25d | 1111 | hcon->role)) |
9ab65d60 JH |
1112 | return false; |
1113 | ||
854f4727 JH |
1114 | if (hcon->sec_level >= sec_level) |
1115 | return true; | |
1116 | ||
1117 | return false; | |
1118 | } | |
1119 | ||
da85e5e5 | 1120 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
1121 | { |
1122 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
1123 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 1124 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 1125 | struct smp_chan *smp; |
c7262e71 | 1126 | u8 sec_level; |
88ba43b6 AB |
1127 | |
1128 | BT_DBG("conn %p", conn); | |
1129 | ||
c46b98be | 1130 | if (skb->len < sizeof(*rp)) |
38e4a915 | 1131 | return SMP_INVALID_PARAMS; |
c46b98be | 1132 | |
40bef302 | 1133 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
1134 | return SMP_CMD_NOTSUPP; |
1135 | ||
c7262e71 | 1136 | sec_level = authreq_to_seclevel(rp->auth_req); |
854f4727 JH |
1137 | if (smp_sufficient_security(hcon, sec_level)) |
1138 | return 0; | |
1139 | ||
c7262e71 JH |
1140 | if (sec_level > hcon->pending_sec_level) |
1141 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 1142 | |
4dab7864 | 1143 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
1144 | return 0; |
1145 | ||
51a8efd7 | 1146 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
da85e5e5 | 1147 | return 0; |
f1cb9af5 | 1148 | |
8aab4757 | 1149 | smp = smp_chan_create(conn); |
c29d2444 JH |
1150 | if (!smp) |
1151 | return SMP_UNSPECIFIED; | |
d26a2345 | 1152 | |
b6ae8457 | 1153 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
616d55be JH |
1154 | (rp->auth_req & SMP_AUTH_BONDING)) |
1155 | return SMP_PAIRING_NOTSUPP; | |
1156 | ||
88ba43b6 | 1157 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 1158 | |
da85e5e5 | 1159 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 1160 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 1161 | |
1c1def09 VCG |
1162 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1163 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1164 | |
88ba43b6 | 1165 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 1166 | |
da85e5e5 | 1167 | return 0; |
88ba43b6 AB |
1168 | } |
1169 | ||
cc110922 | 1170 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 1171 | { |
cc110922 | 1172 | struct l2cap_conn *conn = hcon->l2cap_data; |
0a66cf20 | 1173 | struct smp_chan *smp; |
2b64d153 | 1174 | __u8 authreq; |
eb492e01 | 1175 | |
3a0259bb VCG |
1176 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
1177 | ||
0a66cf20 JH |
1178 | /* This may be NULL if there's an unexpected disconnection */ |
1179 | if (!conn) | |
1180 | return 1; | |
1181 | ||
757aee0f | 1182 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
1183 | return 1; |
1184 | ||
ad32a2f5 | 1185 | if (smp_sufficient_security(hcon, sec_level)) |
eb492e01 | 1186 | return 1; |
f1cb9af5 | 1187 | |
c7262e71 JH |
1188 | if (sec_level > hcon->pending_sec_level) |
1189 | hcon->pending_sec_level = sec_level; | |
1190 | ||
40bef302 | 1191 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
1192 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
1193 | return 0; | |
d26a2345 | 1194 | |
51a8efd7 | 1195 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
1196 | return 0; |
1197 | ||
8aab4757 | 1198 | smp = smp_chan_create(conn); |
2b64d153 BG |
1199 | if (!smp) |
1200 | return 1; | |
1201 | ||
1202 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 1203 | |
79897d20 JH |
1204 | /* Require MITM if IO Capability allows or the security level |
1205 | * requires it. | |
2e233644 | 1206 | */ |
79897d20 | 1207 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 1208 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
1209 | authreq |= SMP_AUTH_MITM; |
1210 | ||
40bef302 | 1211 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 1212 | struct smp_cmd_pairing cp; |
f01ead31 | 1213 | |
2b64d153 | 1214 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
1215 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1216 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1217 | |
eb492e01 AB |
1218 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
1219 | } else { | |
1220 | struct smp_cmd_security_req cp; | |
2b64d153 | 1221 | cp.auth_req = authreq; |
eb492e01 AB |
1222 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
1223 | } | |
1224 | ||
4a74d658 | 1225 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
edca792c | 1226 | |
eb492e01 AB |
1227 | return 0; |
1228 | } | |
1229 | ||
7034b911 VCG |
1230 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1231 | { | |
16b90839 | 1232 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
1233 | struct l2cap_chan *chan = conn->smp; |
1234 | struct smp_chan *smp = chan->data; | |
16b90839 | 1235 | |
c46b98be JH |
1236 | BT_DBG("conn %p", conn); |
1237 | ||
1238 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1239 | return SMP_INVALID_PARAMS; |
c46b98be | 1240 | |
6131ddc8 JH |
1241 | /* Ignore this PDU if it wasn't requested */ |
1242 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1243 | return 0; | |
1244 | ||
16b90839 VCG |
1245 | skb_pull(skb, sizeof(*rp)); |
1246 | ||
1c1def09 | 1247 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1248 | |
7034b911 VCG |
1249 | return 0; |
1250 | } | |
1251 | ||
1252 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1253 | { | |
16b90839 | 1254 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
1255 | struct l2cap_chan *chan = conn->smp; |
1256 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
1257 | struct hci_dev *hdev = conn->hcon->hdev; |
1258 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1259 | struct smp_ltk *ltk; |
c9839a11 | 1260 | u8 authenticated; |
16b90839 | 1261 | |
c46b98be JH |
1262 | BT_DBG("conn %p", conn); |
1263 | ||
1264 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1265 | return SMP_INVALID_PARAMS; |
c46b98be | 1266 | |
6131ddc8 JH |
1267 | /* Ignore this PDU if it wasn't requested */ |
1268 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1269 | return 0; | |
1270 | ||
9747a9f3 JH |
1271 | /* Mark the information as received */ |
1272 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1273 | ||
16b90839 | 1274 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1275 | |
c9839a11 | 1276 | hci_dev_lock(hdev); |
ce39fb4e | 1277 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1278 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1279 | authenticated, smp->tk, smp->enc_key_size, |
1280 | rp->ediv, rp->rand); | |
1281 | smp->ltk = ltk; | |
fd349c02 | 1282 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) |
d6268e86 | 1283 | smp_distribute_keys(smp); |
c9839a11 | 1284 | hci_dev_unlock(hdev); |
7034b911 VCG |
1285 | |
1286 | return 0; | |
1287 | } | |
1288 | ||
fd349c02 JH |
1289 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1290 | { | |
1291 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
1292 | struct l2cap_chan *chan = conn->smp; |
1293 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1294 | |
1295 | BT_DBG(""); | |
1296 | ||
1297 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1298 | return SMP_INVALID_PARAMS; |
fd349c02 | 1299 | |
6131ddc8 JH |
1300 | /* Ignore this PDU if it wasn't requested */ |
1301 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1302 | return 0; | |
1303 | ||
fd349c02 JH |
1304 | skb_pull(skb, sizeof(*info)); |
1305 | ||
1306 | memcpy(smp->irk, info->irk, 16); | |
1307 | ||
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1312 | struct sk_buff *skb) | |
1313 | { | |
1314 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
1315 | struct l2cap_chan *chan = conn->smp; |
1316 | struct smp_chan *smp = chan->data; | |
fd349c02 | 1317 | struct hci_conn *hcon = conn->hcon; |
86d1407c | 1318 | struct hci_dev *hdev = hcon->hdev; |
fd349c02 JH |
1319 | bdaddr_t rpa; |
1320 | ||
1321 | BT_DBG(""); | |
1322 | ||
1323 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1324 | return SMP_INVALID_PARAMS; |
fd349c02 | 1325 | |
6131ddc8 JH |
1326 | /* Ignore this PDU if it wasn't requested */ |
1327 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1328 | return 0; | |
1329 | ||
9747a9f3 JH |
1330 | /* Mark the information as received */ |
1331 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1332 | ||
fd349c02 JH |
1333 | skb_pull(skb, sizeof(*info)); |
1334 | ||
31dd624e JH |
1335 | hci_dev_lock(hcon->hdev); |
1336 | ||
a9a58f86 JH |
1337 | /* Strictly speaking the Core Specification (4.1) allows sending |
1338 | * an empty address which would force us to rely on just the IRK | |
1339 | * as "identity information". However, since such | |
1340 | * implementations are not known of and in order to not over | |
1341 | * complicate our implementation, simply pretend that we never | |
1342 | * received an IRK for such a device. | |
1343 | */ | |
1344 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1345 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1346 | goto distribute; |
a9a58f86 JH |
1347 | } |
1348 | ||
fd349c02 JH |
1349 | bacpy(&smp->id_addr, &info->bdaddr); |
1350 | smp->id_addr_type = info->addr_type; | |
1351 | ||
1352 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1353 | bacpy(&rpa, &hcon->dst); | |
1354 | else | |
1355 | bacpy(&rpa, BDADDR_ANY); | |
1356 | ||
23d0e128 JH |
1357 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1358 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1359 | |
31dd624e | 1360 | distribute: |
d6268e86 | 1361 | smp_distribute_keys(smp); |
fd349c02 | 1362 | |
31dd624e JH |
1363 | hci_dev_unlock(hcon->hdev); |
1364 | ||
fd349c02 JH |
1365 | return 0; |
1366 | } | |
1367 | ||
7ee4ea36 MH |
1368 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1369 | { | |
1370 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
1371 | struct l2cap_chan *chan = conn->smp; |
1372 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
1373 | struct hci_dev *hdev = conn->hcon->hdev; |
1374 | struct smp_csrk *csrk; | |
1375 | ||
1376 | BT_DBG("conn %p", conn); | |
1377 | ||
1378 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1379 | return SMP_INVALID_PARAMS; |
7ee4ea36 MH |
1380 | |
1381 | /* Ignore this PDU if it wasn't requested */ | |
1382 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1383 | return 0; | |
1384 | ||
1385 | /* Mark the information as received */ | |
1386 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1387 | ||
1388 | skb_pull(skb, sizeof(*rp)); | |
1389 | ||
1390 | hci_dev_lock(hdev); | |
1391 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1392 | if (csrk) { | |
1393 | csrk->master = 0x01; | |
1394 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1395 | } | |
1396 | smp->csrk = csrk; | |
d6268e86 | 1397 | smp_distribute_keys(smp); |
7ee4ea36 MH |
1398 | hci_dev_unlock(hdev); |
1399 | ||
1400 | return 0; | |
1401 | } | |
1402 | ||
4befb867 | 1403 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 1404 | { |
5d88cc73 | 1405 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 1406 | struct hci_conn *hcon = conn->hcon; |
92381f5c | 1407 | __u8 code, reason; |
eb492e01 AB |
1408 | int err = 0; |
1409 | ||
7b9899db MH |
1410 | if (hcon->type != LE_LINK) { |
1411 | kfree_skb(skb); | |
3432711f | 1412 | return 0; |
7b9899db MH |
1413 | } |
1414 | ||
8ae9b984 | 1415 | if (skb->len < 1) |
92381f5c | 1416 | return -EILSEQ; |
92381f5c | 1417 | |
06ae3314 | 1418 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1419 | reason = SMP_PAIRING_NOTSUPP; |
1420 | goto done; | |
1421 | } | |
1422 | ||
92381f5c | 1423 | code = skb->data[0]; |
eb492e01 AB |
1424 | skb_pull(skb, sizeof(code)); |
1425 | ||
8cf9fa12 JH |
1426 | /* |
1427 | * The SMP context must be initialized for all other PDUs except | |
1428 | * pairing and security requests. If we get any other PDU when | |
1429 | * not initialized simply disconnect (done if this function | |
1430 | * returns an error). | |
1431 | */ | |
1432 | if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && | |
d3368605 | 1433 | !test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { |
8cf9fa12 | 1434 | BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); |
8ae9b984 JH |
1435 | err = -EOPNOTSUPP; |
1436 | goto done; | |
8cf9fa12 JH |
1437 | } |
1438 | ||
eb492e01 AB |
1439 | switch (code) { |
1440 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1441 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1442 | break; |
1443 | ||
1444 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1445 | smp_failure(conn, 0); |
da85e5e5 | 1446 | err = -EPERM; |
eb492e01 AB |
1447 | break; |
1448 | ||
1449 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1450 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1451 | break; |
1452 | ||
1453 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1454 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1455 | break; |
1456 | ||
eb492e01 | 1457 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1458 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1459 | break; |
1460 | ||
eb492e01 | 1461 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1462 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1463 | break; |
1464 | ||
eb492e01 | 1465 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1466 | reason = smp_cmd_encrypt_info(conn, skb); |
1467 | break; | |
1468 | ||
eb492e01 | 1469 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1470 | reason = smp_cmd_master_ident(conn, skb); |
1471 | break; | |
1472 | ||
eb492e01 | 1473 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1474 | reason = smp_cmd_ident_info(conn, skb); |
1475 | break; | |
1476 | ||
eb492e01 | 1477 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1478 | reason = smp_cmd_ident_addr_info(conn, skb); |
1479 | break; | |
1480 | ||
eb492e01 | 1481 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1482 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1483 | break; |
1484 | ||
eb492e01 AB |
1485 | default: |
1486 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 1487 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 1488 | goto done; |
eb492e01 AB |
1489 | } |
1490 | ||
3a0259bb | 1491 | done: |
9b7b18ef JH |
1492 | if (!err) { |
1493 | if (reason) | |
1494 | smp_failure(conn, reason); | |
8ae9b984 | 1495 | kfree_skb(skb); |
9b7b18ef JH |
1496 | } |
1497 | ||
eb492e01 AB |
1498 | return err; |
1499 | } | |
7034b911 | 1500 | |
70db83c4 JH |
1501 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
1502 | { | |
1503 | struct l2cap_conn *conn = chan->conn; | |
1504 | ||
1505 | BT_DBG("chan %p", chan); | |
1506 | ||
109ec230 | 1507 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
5d88cc73 | 1508 | smp_chan_destroy(conn); |
5d88cc73 | 1509 | |
70db83c4 JH |
1510 | conn->smp = NULL; |
1511 | l2cap_chan_put(chan); | |
1512 | } | |
1513 | ||
44f1a7ab JH |
1514 | static void smp_resume_cb(struct l2cap_chan *chan) |
1515 | { | |
b68fda68 | 1516 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
1517 | struct l2cap_conn *conn = chan->conn; |
1518 | struct hci_conn *hcon = conn->hcon; | |
1519 | ||
1520 | BT_DBG("chan %p", chan); | |
1521 | ||
86d1407c JH |
1522 | if (!smp) |
1523 | return; | |
b68fda68 | 1524 | |
84bc0db5 JH |
1525 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
1526 | return; | |
1527 | ||
86d1407c JH |
1528 | cancel_delayed_work(&smp->security_timer); |
1529 | ||
d6268e86 | 1530 | smp_distribute_keys(smp); |
44f1a7ab JH |
1531 | } |
1532 | ||
70db83c4 JH |
1533 | static void smp_ready_cb(struct l2cap_chan *chan) |
1534 | { | |
1535 | struct l2cap_conn *conn = chan->conn; | |
1536 | ||
1537 | BT_DBG("chan %p", chan); | |
1538 | ||
1539 | conn->smp = chan; | |
1540 | l2cap_chan_hold(chan); | |
1541 | } | |
1542 | ||
4befb867 JH |
1543 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
1544 | { | |
1545 | int err; | |
1546 | ||
1547 | BT_DBG("chan %p", chan); | |
1548 | ||
1549 | err = smp_sig_channel(chan, skb); | |
1550 | if (err) { | |
b68fda68 | 1551 | struct smp_chan *smp = chan->data; |
4befb867 | 1552 | |
b68fda68 JH |
1553 | if (smp) |
1554 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 1555 | |
1e91c29e | 1556 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
1557 | } |
1558 | ||
1559 | return err; | |
1560 | } | |
1561 | ||
70db83c4 JH |
1562 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
1563 | unsigned long hdr_len, | |
1564 | unsigned long len, int nb) | |
1565 | { | |
1566 | struct sk_buff *skb; | |
1567 | ||
1568 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
1569 | if (!skb) | |
1570 | return ERR_PTR(-ENOMEM); | |
1571 | ||
1572 | skb->priority = HCI_PRIO_MAX; | |
1573 | bt_cb(skb)->chan = chan; | |
1574 | ||
1575 | return skb; | |
1576 | } | |
1577 | ||
1578 | static const struct l2cap_ops smp_chan_ops = { | |
1579 | .name = "Security Manager", | |
1580 | .ready = smp_ready_cb, | |
5d88cc73 | 1581 | .recv = smp_recv_cb, |
70db83c4 JH |
1582 | .alloc_skb = smp_alloc_skb_cb, |
1583 | .teardown = smp_teardown_cb, | |
44f1a7ab | 1584 | .resume = smp_resume_cb, |
70db83c4 JH |
1585 | |
1586 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
1587 | .state_change = l2cap_chan_no_state_change, |
1588 | .close = l2cap_chan_no_close, | |
1589 | .defer = l2cap_chan_no_defer, | |
1590 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
1591 | .set_shutdown = l2cap_chan_no_set_shutdown, |
1592 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1593 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1594 | }; | |
1595 | ||
1596 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
1597 | { | |
1598 | struct l2cap_chan *chan; | |
1599 | ||
1600 | BT_DBG("pchan %p", pchan); | |
1601 | ||
1602 | chan = l2cap_chan_create(); | |
1603 | if (!chan) | |
1604 | return NULL; | |
1605 | ||
1606 | chan->chan_type = pchan->chan_type; | |
1607 | chan->ops = &smp_chan_ops; | |
1608 | chan->scid = pchan->scid; | |
1609 | chan->dcid = chan->scid; | |
1610 | chan->imtu = pchan->imtu; | |
1611 | chan->omtu = pchan->omtu; | |
1612 | chan->mode = pchan->mode; | |
1613 | ||
1614 | BT_DBG("created chan %p", chan); | |
1615 | ||
1616 | return chan; | |
1617 | } | |
1618 | ||
1619 | static const struct l2cap_ops smp_root_chan_ops = { | |
1620 | .name = "Security Manager Root", | |
1621 | .new_connection = smp_new_conn_cb, | |
1622 | ||
1623 | /* None of these are implemented for the root channel */ | |
1624 | .close = l2cap_chan_no_close, | |
1625 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
1626 | .recv = l2cap_chan_no_recv, | |
1627 | .state_change = l2cap_chan_no_state_change, | |
1628 | .teardown = l2cap_chan_no_teardown, | |
1629 | .ready = l2cap_chan_no_ready, | |
1630 | .defer = l2cap_chan_no_defer, | |
1631 | .suspend = l2cap_chan_no_suspend, | |
1632 | .resume = l2cap_chan_no_resume, | |
1633 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1634 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1635 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1636 | }; | |
1637 | ||
711eafe3 JH |
1638 | int smp_register(struct hci_dev *hdev) |
1639 | { | |
70db83c4 | 1640 | struct l2cap_chan *chan; |
defce9e8 | 1641 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 1642 | |
711eafe3 JH |
1643 | BT_DBG("%s", hdev->name); |
1644 | ||
defce9e8 JH |
1645 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
1646 | if (IS_ERR(tfm_aes)) { | |
1647 | int err = PTR_ERR(tfm_aes); | |
711eafe3 | 1648 | BT_ERR("Unable to create crypto context"); |
711eafe3 JH |
1649 | return err; |
1650 | } | |
1651 | ||
70db83c4 JH |
1652 | chan = l2cap_chan_create(); |
1653 | if (!chan) { | |
defce9e8 | 1654 | crypto_free_blkcipher(tfm_aes); |
70db83c4 JH |
1655 | return -ENOMEM; |
1656 | } | |
1657 | ||
defce9e8 JH |
1658 | chan->data = tfm_aes; |
1659 | ||
5d88cc73 | 1660 | l2cap_add_scid(chan, L2CAP_CID_SMP); |
70db83c4 JH |
1661 | |
1662 | l2cap_chan_set_defaults(chan); | |
1663 | ||
1664 | bacpy(&chan->src, &hdev->bdaddr); | |
1665 | chan->src_type = BDADDR_LE_PUBLIC; | |
1666 | chan->state = BT_LISTEN; | |
1667 | chan->mode = L2CAP_MODE_BASIC; | |
1668 | chan->imtu = L2CAP_DEFAULT_MTU; | |
1669 | chan->ops = &smp_root_chan_ops; | |
1670 | ||
1671 | hdev->smp_data = chan; | |
1672 | ||
711eafe3 JH |
1673 | return 0; |
1674 | } | |
1675 | ||
1676 | void smp_unregister(struct hci_dev *hdev) | |
1677 | { | |
70db83c4 | 1678 | struct l2cap_chan *chan = hdev->smp_data; |
defce9e8 | 1679 | struct crypto_blkcipher *tfm_aes; |
70db83c4 JH |
1680 | |
1681 | if (!chan) | |
1682 | return; | |
1683 | ||
1684 | BT_DBG("%s chan %p", hdev->name, chan); | |
711eafe3 | 1685 | |
defce9e8 JH |
1686 | tfm_aes = chan->data; |
1687 | if (tfm_aes) { | |
1688 | chan->data = NULL; | |
1689 | crypto_free_blkcipher(tfm_aes); | |
711eafe3 | 1690 | } |
70db83c4 JH |
1691 | |
1692 | hdev->smp_data = NULL; | |
1693 | l2cap_chan_put(chan); | |
711eafe3 | 1694 | } |