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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 | 411 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 412 | |
84794e11 | 413 | if (reason) |
4f957a76 | 414 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 415 | &reason); |
4f957a76 | 416 | |
ce39fb4e MH |
417 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
418 | mgmt_auth_failed(hcon->hdev, &hcon->dst, hcon->type, hcon->dst_type, | |
419 | HCI_ERROR_AUTH_FAILURE); | |
f1c09c07 | 420 | |
fc75cc86 | 421 | if (chan->data) |
f1c09c07 | 422 | smp_chan_destroy(conn); |
4f957a76 BG |
423 | } |
424 | ||
2b64d153 BG |
425 | #define JUST_WORKS 0x00 |
426 | #define JUST_CFM 0x01 | |
427 | #define REQ_PASSKEY 0x02 | |
428 | #define CFM_PASSKEY 0x03 | |
429 | #define REQ_OOB 0x04 | |
430 | #define OVERLAP 0xFF | |
431 | ||
432 | static const u8 gen_method[5][5] = { | |
433 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
434 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
435 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
436 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
437 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
438 | }; | |
439 | ||
581370cc JH |
440 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
441 | { | |
2bcd4003 JH |
442 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
443 | * converted later to JUST_WORKS if we're initiators. | |
444 | */ | |
581370cc JH |
445 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
446 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 447 | return JUST_CFM; |
581370cc JH |
448 | |
449 | return gen_method[remote_io][local_io]; | |
450 | } | |
451 | ||
2b64d153 BG |
452 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
453 | u8 local_io, u8 remote_io) | |
454 | { | |
455 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
456 | struct l2cap_chan *chan = conn->smp; |
457 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
458 | u8 method; |
459 | u32 passkey = 0; | |
460 | int ret = 0; | |
461 | ||
462 | /* Initialize key for JUST WORKS */ | |
463 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 464 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
465 | |
466 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
467 | ||
2bcd4003 JH |
468 | /* If neither side wants MITM, either "just" confirm an incoming |
469 | * request or use just-works for outgoing ones. The JUST_CFM | |
470 | * will be converted to JUST_WORKS if necessary later in this | |
471 | * function. If either side has MITM look up the method from the | |
472 | * table. | |
473 | */ | |
581370cc | 474 | if (!(auth & SMP_AUTH_MITM)) |
2bcd4003 | 475 | method = JUST_CFM; |
2b64d153 | 476 | else |
581370cc | 477 | method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 478 | |
a82505c7 | 479 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 480 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
481 | method = JUST_WORKS; |
482 | ||
02f3e254 JH |
483 | /* Don't bother user space with no IO capabilities */ |
484 | if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
485 | method = JUST_WORKS; | |
486 | ||
2b64d153 BG |
487 | /* If Just Works, Continue with Zero TK */ |
488 | if (method == JUST_WORKS) { | |
4a74d658 | 489 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
490 | return 0; |
491 | } | |
492 | ||
493 | /* Not Just Works/Confirm results in MITM Authentication */ | |
494 | if (method != JUST_CFM) | |
4a74d658 | 495 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
2b64d153 BG |
496 | |
497 | /* If both devices have Keyoard-Display I/O, the master | |
498 | * Confirms and the slave Enters the passkey. | |
499 | */ | |
500 | if (method == OVERLAP) { | |
40bef302 | 501 | if (hcon->role == HCI_ROLE_MASTER) |
2b64d153 BG |
502 | method = CFM_PASSKEY; |
503 | else | |
504 | method = REQ_PASSKEY; | |
505 | } | |
506 | ||
01ad34d2 | 507 | /* Generate random passkey. */ |
2b64d153 | 508 | if (method == CFM_PASSKEY) { |
943a732a | 509 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
510 | get_random_bytes(&passkey, sizeof(passkey)); |
511 | passkey %= 1000000; | |
943a732a | 512 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 513 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 514 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
515 | } |
516 | ||
517 | hci_dev_lock(hcon->hdev); | |
518 | ||
519 | if (method == REQ_PASSKEY) | |
ce39fb4e | 520 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 521 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
522 | else if (method == JUST_CFM) |
523 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
524 | hcon->type, hcon->dst_type, | |
525 | passkey, 1); | |
2b64d153 | 526 | else |
01ad34d2 | 527 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 528 | hcon->type, hcon->dst_type, |
39adbffe | 529 | passkey, 0); |
2b64d153 BG |
530 | |
531 | hci_dev_unlock(hcon->hdev); | |
532 | ||
533 | return ret; | |
534 | } | |
535 | ||
1cc61144 | 536 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 537 | { |
8aab4757 | 538 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
539 | struct smp_cmd_pairing_confirm cp; |
540 | int ret; | |
8aab4757 VCG |
541 | |
542 | BT_DBG("conn %p", conn); | |
543 | ||
ec70f36f | 544 | ret = smp_c1(smp, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 545 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
546 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
547 | cp.confirm_val); | |
1cc61144 JH |
548 | if (ret) |
549 | return SMP_UNSPECIFIED; | |
8aab4757 | 550 | |
4a74d658 | 551 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 552 | |
8aab4757 VCG |
553 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
554 | ||
1cc61144 | 555 | return 0; |
8aab4757 VCG |
556 | } |
557 | ||
861580a9 | 558 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 559 | { |
8aab4757 VCG |
560 | struct l2cap_conn *conn = smp->conn; |
561 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 562 | u8 confirm[16]; |
8aab4757 VCG |
563 | int ret; |
564 | ||
ec70f36f | 565 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 566 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
567 | |
568 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
569 | ||
ec70f36f | 570 | ret = smp_c1(smp, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 571 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 572 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
573 | if (ret) |
574 | return SMP_UNSPECIFIED; | |
8aab4757 | 575 | |
8aab4757 VCG |
576 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
577 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 578 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
579 | } |
580 | ||
581 | if (hcon->out) { | |
fe39c7b2 MH |
582 | u8 stk[16]; |
583 | __le64 rand = 0; | |
584 | __le16 ediv = 0; | |
8aab4757 | 585 | |
ec70f36f | 586 | smp_s1(smp, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 587 | |
f7aa611a | 588 | memset(stk + smp->enc_key_size, 0, |
04124681 | 589 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 590 | |
861580a9 JH |
591 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
592 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
593 | |
594 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 595 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 596 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 597 | } else { |
fff3490f | 598 | u8 stk[16], auth; |
fe39c7b2 MH |
599 | __le64 rand = 0; |
600 | __le16 ediv = 0; | |
8aab4757 | 601 | |
943a732a JH |
602 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
603 | smp->prnd); | |
8aab4757 | 604 | |
ec70f36f | 605 | smp_s1(smp, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 606 | |
f7aa611a | 607 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 608 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 609 | |
fff3490f JH |
610 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
611 | auth = 1; | |
612 | else | |
613 | auth = 0; | |
614 | ||
7d5843b7 JH |
615 | /* Even though there's no _SLAVE suffix this is the |
616 | * slave STK we're adding for later lookup (the master | |
617 | * STK never needs to be stored). | |
618 | */ | |
ce39fb4e | 619 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 620 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
621 | } |
622 | ||
861580a9 | 623 | return 0; |
8aab4757 VCG |
624 | } |
625 | ||
44f1a7ab JH |
626 | static void smp_notify_keys(struct l2cap_conn *conn) |
627 | { | |
628 | struct l2cap_chan *chan = conn->smp; | |
629 | struct smp_chan *smp = chan->data; | |
630 | struct hci_conn *hcon = conn->hcon; | |
631 | struct hci_dev *hdev = hcon->hdev; | |
632 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
633 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
634 | bool persistent; | |
635 | ||
636 | if (smp->remote_irk) { | |
637 | mgmt_new_irk(hdev, smp->remote_irk); | |
638 | /* Now that user space can be considered to know the | |
639 | * identity address track the connection based on it | |
640 | * from now on. | |
641 | */ | |
642 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
643 | hcon->dst_type = smp->remote_irk->addr_type; | |
f3d82d0c | 644 | queue_work(hdev->workqueue, &conn->id_addr_update_work); |
44f1a7ab JH |
645 | |
646 | /* When receiving an indentity resolving key for | |
647 | * a remote device that does not use a resolvable | |
648 | * private address, just remove the key so that | |
649 | * it is possible to use the controller white | |
650 | * list for scanning. | |
651 | * | |
652 | * Userspace will have been told to not store | |
653 | * this key at this point. So it is safe to | |
654 | * just remove it. | |
655 | */ | |
656 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
657 | list_del(&smp->remote_irk->list); | |
658 | kfree(smp->remote_irk); | |
659 | smp->remote_irk = NULL; | |
660 | } | |
661 | } | |
662 | ||
663 | /* The LTKs and CSRKs should be persistent only if both sides | |
664 | * had the bonding bit set in their authentication requests. | |
665 | */ | |
666 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
667 | ||
668 | if (smp->csrk) { | |
669 | smp->csrk->bdaddr_type = hcon->dst_type; | |
670 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
671 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
672 | } | |
673 | ||
674 | if (smp->slave_csrk) { | |
675 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
676 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
677 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
678 | } | |
679 | ||
680 | if (smp->ltk) { | |
681 | smp->ltk->bdaddr_type = hcon->dst_type; | |
682 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
683 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
684 | } | |
685 | ||
686 | if (smp->slave_ltk) { | |
687 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
688 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
689 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
690 | } | |
691 | } | |
692 | ||
d6268e86 | 693 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
694 | { |
695 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 696 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
697 | struct hci_conn *hcon = conn->hcon; |
698 | struct hci_dev *hdev = hcon->hdev; | |
699 | __u8 *keydist; | |
700 | ||
701 | BT_DBG("conn %p", conn); | |
702 | ||
44f1a7ab JH |
703 | rsp = (void *) &smp->prsp[1]; |
704 | ||
705 | /* The responder sends its keys first */ | |
706 | if (hcon->out && (smp->remote_key_dist & 0x07)) | |
86d1407c | 707 | return; |
44f1a7ab JH |
708 | |
709 | req = (void *) &smp->preq[1]; | |
710 | ||
711 | if (hcon->out) { | |
712 | keydist = &rsp->init_key_dist; | |
713 | *keydist &= req->init_key_dist; | |
714 | } else { | |
715 | keydist = &rsp->resp_key_dist; | |
716 | *keydist &= req->resp_key_dist; | |
717 | } | |
718 | ||
719 | BT_DBG("keydist 0x%x", *keydist); | |
720 | ||
721 | if (*keydist & SMP_DIST_ENC_KEY) { | |
722 | struct smp_cmd_encrypt_info enc; | |
723 | struct smp_cmd_master_ident ident; | |
724 | struct smp_ltk *ltk; | |
725 | u8 authenticated; | |
726 | __le16 ediv; | |
727 | __le64 rand; | |
728 | ||
729 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
730 | get_random_bytes(&ediv, sizeof(ediv)); | |
731 | get_random_bytes(&rand, sizeof(rand)); | |
732 | ||
733 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
734 | ||
735 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
736 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
737 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
738 | smp->enc_key_size, ediv, rand); | |
739 | smp->slave_ltk = ltk; | |
740 | ||
741 | ident.ediv = ediv; | |
742 | ident.rand = rand; | |
743 | ||
744 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
745 | ||
746 | *keydist &= ~SMP_DIST_ENC_KEY; | |
747 | } | |
748 | ||
749 | if (*keydist & SMP_DIST_ID_KEY) { | |
750 | struct smp_cmd_ident_addr_info addrinfo; | |
751 | struct smp_cmd_ident_info idinfo; | |
752 | ||
753 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
754 | ||
755 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
756 | ||
757 | /* The hci_conn contains the local identity address | |
758 | * after the connection has been established. | |
759 | * | |
760 | * This is true even when the connection has been | |
761 | * established using a resolvable random address. | |
762 | */ | |
763 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
764 | addrinfo.addr_type = hcon->src_type; | |
765 | ||
766 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
767 | &addrinfo); | |
768 | ||
769 | *keydist &= ~SMP_DIST_ID_KEY; | |
770 | } | |
771 | ||
772 | if (*keydist & SMP_DIST_SIGN) { | |
773 | struct smp_cmd_sign_info sign; | |
774 | struct smp_csrk *csrk; | |
775 | ||
776 | /* Generate a new random key */ | |
777 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
778 | ||
779 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
780 | if (csrk) { | |
781 | csrk->master = 0x00; | |
782 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
783 | } | |
784 | smp->slave_csrk = csrk; | |
785 | ||
786 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
787 | ||
788 | *keydist &= ~SMP_DIST_SIGN; | |
789 | } | |
790 | ||
791 | /* If there are still keys to be received wait for them */ | |
792 | if ((smp->remote_key_dist & 0x07)) | |
86d1407c | 793 | return; |
44f1a7ab | 794 | |
44f1a7ab JH |
795 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
796 | smp_notify_keys(conn); | |
797 | ||
798 | smp_chan_destroy(conn); | |
44f1a7ab JH |
799 | } |
800 | ||
b68fda68 JH |
801 | static void smp_timeout(struct work_struct *work) |
802 | { | |
803 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
804 | security_timer.work); | |
805 | struct l2cap_conn *conn = smp->conn; | |
806 | ||
807 | BT_DBG("conn %p", conn); | |
808 | ||
1e91c29e | 809 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
810 | } |
811 | ||
8aab4757 VCG |
812 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
813 | { | |
5d88cc73 | 814 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
815 | struct smp_chan *smp; |
816 | ||
f1560463 | 817 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 818 | if (!smp) |
8aab4757 VCG |
819 | return NULL; |
820 | ||
6a7bd103 JH |
821 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
822 | if (IS_ERR(smp->tfm_aes)) { | |
823 | BT_ERR("Unable to create ECB crypto context"); | |
824 | kfree(smp); | |
825 | return NULL; | |
826 | } | |
827 | ||
8aab4757 | 828 | smp->conn = conn; |
5d88cc73 | 829 | chan->data = smp; |
8aab4757 | 830 | |
b68fda68 JH |
831 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
832 | ||
8aab4757 VCG |
833 | hci_conn_hold(conn->hcon); |
834 | ||
835 | return smp; | |
836 | } | |
837 | ||
2b64d153 BG |
838 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
839 | { | |
b10e8017 | 840 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 841 | struct l2cap_chan *chan; |
2b64d153 BG |
842 | struct smp_chan *smp; |
843 | u32 value; | |
fc75cc86 | 844 | int err; |
2b64d153 BG |
845 | |
846 | BT_DBG(""); | |
847 | ||
fc75cc86 | 848 | if (!conn) |
2b64d153 BG |
849 | return -ENOTCONN; |
850 | ||
5d88cc73 JH |
851 | chan = conn->smp; |
852 | if (!chan) | |
853 | return -ENOTCONN; | |
854 | ||
fc75cc86 JH |
855 | l2cap_chan_lock(chan); |
856 | if (!chan->data) { | |
857 | err = -ENOTCONN; | |
858 | goto unlock; | |
859 | } | |
860 | ||
5d88cc73 | 861 | smp = chan->data; |
2b64d153 BG |
862 | |
863 | switch (mgmt_op) { | |
864 | case MGMT_OP_USER_PASSKEY_REPLY: | |
865 | value = le32_to_cpu(passkey); | |
943a732a | 866 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 867 | BT_DBG("PassKey: %d", value); |
943a732a | 868 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
869 | /* Fall Through */ |
870 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 871 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
872 | break; |
873 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
874 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 875 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
876 | err = 0; |
877 | goto unlock; | |
2b64d153 | 878 | default: |
84794e11 | 879 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
880 | err = -EOPNOTSUPP; |
881 | goto unlock; | |
2b64d153 BG |
882 | } |
883 | ||
fc75cc86 JH |
884 | err = 0; |
885 | ||
2b64d153 | 886 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
887 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
888 | u8 rsp = smp_confirm(smp); | |
889 | if (rsp) | |
890 | smp_failure(conn, rsp); | |
891 | } | |
2b64d153 | 892 | |
fc75cc86 JH |
893 | unlock: |
894 | l2cap_chan_unlock(chan); | |
895 | return err; | |
2b64d153 BG |
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; |
fc75cc86 | 901 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 902 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 903 | struct smp_chan *smp; |
c7262e71 | 904 | u8 key_size, auth, sec_level; |
8aab4757 | 905 | int ret; |
88ba43b6 AB |
906 | |
907 | BT_DBG("conn %p", conn); | |
908 | ||
c46b98be | 909 | if (skb->len < sizeof(*req)) |
38e4a915 | 910 | return SMP_INVALID_PARAMS; |
c46b98be | 911 | |
40bef302 | 912 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
913 | return SMP_CMD_NOTSUPP; |
914 | ||
fc75cc86 | 915 | if (!chan->data) |
8aab4757 | 916 | smp = smp_chan_create(conn); |
fc75cc86 | 917 | else |
5d88cc73 | 918 | smp = chan->data; |
8aab4757 | 919 | |
d08fd0e7 AE |
920 | if (!smp) |
921 | return SMP_UNSPECIFIED; | |
d26a2345 | 922 | |
b6ae8457 | 923 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
b3c6410b JH |
924 | (req->auth_req & SMP_AUTH_BONDING)) |
925 | return SMP_PAIRING_NOTSUPP; | |
926 | ||
1c1def09 VCG |
927 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
928 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 929 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 930 | |
2b64d153 | 931 | /* We didn't start the pairing, so match remote */ |
1ef35827 | 932 | auth = req->auth_req; |
da85e5e5 | 933 | |
c7262e71 JH |
934 | sec_level = authreq_to_seclevel(auth); |
935 | if (sec_level > conn->hcon->pending_sec_level) | |
936 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 937 | |
2ed8f65c JH |
938 | /* If we need MITM check that it can be acheived */ |
939 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
940 | u8 method; | |
941 | ||
942 | method = get_auth_method(smp, conn->hcon->io_capability, | |
943 | req->io_capability); | |
944 | if (method == JUST_WORKS || method == JUST_CFM) | |
945 | return SMP_AUTH_REQUIREMENTS; | |
946 | } | |
947 | ||
2b64d153 | 948 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
949 | |
950 | key_size = min(req->max_key_size, rsp.max_key_size); | |
951 | if (check_enc_key_size(conn, key_size)) | |
952 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 953 | |
e84a6b13 | 954 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 955 | |
1c1def09 VCG |
956 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
957 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 958 | |
3158c50c | 959 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 960 | |
2b64d153 BG |
961 | /* Request setup of TK */ |
962 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
963 | if (ret) | |
964 | return SMP_UNSPECIFIED; | |
965 | ||
da85e5e5 | 966 | return 0; |
88ba43b6 AB |
967 | } |
968 | ||
da85e5e5 | 969 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 970 | { |
3158c50c | 971 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
972 | struct l2cap_chan *chan = conn->smp; |
973 | struct smp_chan *smp = chan->data; | |
2b64d153 | 974 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 975 | int ret; |
88ba43b6 AB |
976 | |
977 | BT_DBG("conn %p", conn); | |
978 | ||
c46b98be | 979 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 980 | return SMP_INVALID_PARAMS; |
c46b98be | 981 | |
40bef302 | 982 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
983 | return SMP_CMD_NOTSUPP; |
984 | ||
3158c50c VCG |
985 | skb_pull(skb, sizeof(*rsp)); |
986 | ||
1c1def09 | 987 | req = (void *) &smp->preq[1]; |
da85e5e5 | 988 | |
3158c50c VCG |
989 | key_size = min(req->max_key_size, rsp->max_key_size); |
990 | if (check_enc_key_size(conn, key_size)) | |
991 | return SMP_ENC_KEY_SIZE; | |
992 | ||
2ed8f65c JH |
993 | /* If we need MITM check that it can be acheived */ |
994 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
995 | u8 method; | |
996 | ||
997 | method = get_auth_method(smp, req->io_capability, | |
998 | rsp->io_capability); | |
999 | if (method == JUST_WORKS || method == JUST_CFM) | |
1000 | return SMP_AUTH_REQUIREMENTS; | |
1001 | } | |
1002 | ||
e84a6b13 | 1003 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1004 | |
8aab4757 VCG |
1005 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1006 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 1007 | |
fdcc4bec JH |
1008 | /* Update remote key distribution in case the remote cleared |
1009 | * some bits that we had enabled in our request. | |
1010 | */ | |
1011 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1012 | ||
2b64d153 | 1013 | if ((req->auth_req & SMP_AUTH_BONDING) && |
f1560463 | 1014 | (rsp->auth_req & SMP_AUTH_BONDING)) |
2b64d153 BG |
1015 | auth = SMP_AUTH_BONDING; |
1016 | ||
1017 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
1018 | ||
476585ec | 1019 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1020 | if (ret) |
1021 | return SMP_UNSPECIFIED; | |
1022 | ||
4a74d658 | 1023 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1024 | |
1025 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1026 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1027 | return smp_confirm(smp); |
da85e5e5 VCG |
1028 | |
1029 | return 0; | |
88ba43b6 AB |
1030 | } |
1031 | ||
da85e5e5 | 1032 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1033 | { |
5d88cc73 JH |
1034 | struct l2cap_chan *chan = conn->smp; |
1035 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1036 | |
88ba43b6 AB |
1037 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
1038 | ||
c46b98be | 1039 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 1040 | return SMP_INVALID_PARAMS; |
c46b98be | 1041 | |
1c1def09 VCG |
1042 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
1043 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 1044 | |
943a732a JH |
1045 | if (conn->hcon->out) |
1046 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1047 | smp->prnd); | |
4a74d658 | 1048 | else if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1049 | return smp_confirm(smp); |
943a732a | 1050 | else |
4a74d658 | 1051 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
1052 | |
1053 | return 0; | |
88ba43b6 AB |
1054 | } |
1055 | ||
da85e5e5 | 1056 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1057 | { |
5d88cc73 JH |
1058 | struct l2cap_chan *chan = conn->smp; |
1059 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1060 | |
8aab4757 | 1061 | BT_DBG("conn %p", conn); |
3158c50c | 1062 | |
c46b98be | 1063 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 1064 | return SMP_INVALID_PARAMS; |
c46b98be | 1065 | |
943a732a | 1066 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 1067 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 1068 | |
861580a9 | 1069 | return smp_random(smp); |
88ba43b6 AB |
1070 | } |
1071 | ||
f81cd823 | 1072 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 1073 | { |
c9839a11 | 1074 | struct smp_ltk *key; |
988c5997 VCG |
1075 | struct hci_conn *hcon = conn->hcon; |
1076 | ||
98a0b845 | 1077 | key = hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, |
e804d25d | 1078 | hcon->role); |
988c5997 | 1079 | if (!key) |
f81cd823 | 1080 | return false; |
988c5997 | 1081 | |
4dab7864 | 1082 | if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) |
f81cd823 | 1083 | return false; |
4dab7864 | 1084 | |
51a8efd7 | 1085 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 1086 | return true; |
988c5997 | 1087 | |
c9839a11 VCG |
1088 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
1089 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 1090 | |
fe59a05f JH |
1091 | /* We never store STKs for master role, so clear this flag */ |
1092 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
1093 | ||
f81cd823 | 1094 | return true; |
988c5997 | 1095 | } |
f1560463 | 1096 | |
854f4727 JH |
1097 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level) |
1098 | { | |
1099 | if (sec_level == BT_SECURITY_LOW) | |
1100 | return true; | |
1101 | ||
9ab65d60 JH |
1102 | /* If we're encrypted with an STK always claim insufficient |
1103 | * security. This way we allow the connection to be re-encrypted | |
1104 | * with an LTK, even if the LTK provides the same level of | |
b2d5e254 JH |
1105 | * security. Only exception is if we don't have an LTK (e.g. |
1106 | * because of key distribution bits). | |
9ab65d60 | 1107 | */ |
b2d5e254 JH |
1108 | if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && |
1109 | hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, | |
e804d25d | 1110 | hcon->role)) |
9ab65d60 JH |
1111 | return false; |
1112 | ||
854f4727 JH |
1113 | if (hcon->sec_level >= sec_level) |
1114 | return true; | |
1115 | ||
1116 | return false; | |
1117 | } | |
1118 | ||
da85e5e5 | 1119 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
1120 | { |
1121 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
1122 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 1123 | struct hci_conn *hcon = conn->hcon; |
fc75cc86 | 1124 | struct l2cap_chan *chan = conn->smp; |
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 | ||
fc75cc86 JH |
1146 | /* If SMP is already in progress ignore this request */ |
1147 | if (chan->data) | |
da85e5e5 | 1148 | return 0; |
f1cb9af5 | 1149 | |
8aab4757 | 1150 | smp = smp_chan_create(conn); |
c29d2444 JH |
1151 | if (!smp) |
1152 | return SMP_UNSPECIFIED; | |
d26a2345 | 1153 | |
b6ae8457 | 1154 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
616d55be JH |
1155 | (rp->auth_req & SMP_AUTH_BONDING)) |
1156 | return SMP_PAIRING_NOTSUPP; | |
1157 | ||
88ba43b6 | 1158 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 1159 | |
da85e5e5 | 1160 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 1161 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 1162 | |
1c1def09 VCG |
1163 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1164 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1165 | |
88ba43b6 | 1166 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 1167 | |
da85e5e5 | 1168 | return 0; |
88ba43b6 AB |
1169 | } |
1170 | ||
cc110922 | 1171 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 1172 | { |
cc110922 | 1173 | struct l2cap_conn *conn = hcon->l2cap_data; |
fc75cc86 | 1174 | struct l2cap_chan *chan = conn->smp; |
0a66cf20 | 1175 | struct smp_chan *smp; |
2b64d153 | 1176 | __u8 authreq; |
fc75cc86 | 1177 | int ret; |
eb492e01 | 1178 | |
3a0259bb VCG |
1179 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
1180 | ||
0a66cf20 JH |
1181 | /* This may be NULL if there's an unexpected disconnection */ |
1182 | if (!conn) | |
1183 | return 1; | |
1184 | ||
757aee0f | 1185 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
1186 | return 1; |
1187 | ||
ad32a2f5 | 1188 | if (smp_sufficient_security(hcon, sec_level)) |
eb492e01 | 1189 | return 1; |
f1cb9af5 | 1190 | |
c7262e71 JH |
1191 | if (sec_level > hcon->pending_sec_level) |
1192 | hcon->pending_sec_level = sec_level; | |
1193 | ||
40bef302 | 1194 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
1195 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
1196 | return 0; | |
d26a2345 | 1197 | |
fc75cc86 JH |
1198 | l2cap_chan_lock(chan); |
1199 | ||
1200 | /* If SMP is already in progress ignore this request */ | |
1201 | if (chan->data) { | |
1202 | ret = 0; | |
1203 | goto unlock; | |
1204 | } | |
d26a2345 | 1205 | |
8aab4757 | 1206 | smp = smp_chan_create(conn); |
fc75cc86 JH |
1207 | if (!smp) { |
1208 | ret = 1; | |
1209 | goto unlock; | |
1210 | } | |
2b64d153 BG |
1211 | |
1212 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 1213 | |
79897d20 JH |
1214 | /* Require MITM if IO Capability allows or the security level |
1215 | * requires it. | |
2e233644 | 1216 | */ |
79897d20 | 1217 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 1218 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
1219 | authreq |= SMP_AUTH_MITM; |
1220 | ||
40bef302 | 1221 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 1222 | struct smp_cmd_pairing cp; |
f01ead31 | 1223 | |
2b64d153 | 1224 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
1225 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1226 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1227 | |
eb492e01 AB |
1228 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
1229 | } else { | |
1230 | struct smp_cmd_security_req cp; | |
2b64d153 | 1231 | cp.auth_req = authreq; |
eb492e01 AB |
1232 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
1233 | } | |
1234 | ||
4a74d658 | 1235 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 1236 | ret = 0; |
edca792c | 1237 | |
fc75cc86 JH |
1238 | unlock: |
1239 | l2cap_chan_unlock(chan); | |
1240 | return ret; | |
eb492e01 AB |
1241 | } |
1242 | ||
7034b911 VCG |
1243 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1244 | { | |
16b90839 | 1245 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
1246 | struct l2cap_chan *chan = conn->smp; |
1247 | struct smp_chan *smp = chan->data; | |
16b90839 | 1248 | |
c46b98be JH |
1249 | BT_DBG("conn %p", conn); |
1250 | ||
1251 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1252 | return SMP_INVALID_PARAMS; |
c46b98be | 1253 | |
6131ddc8 JH |
1254 | /* Ignore this PDU if it wasn't requested */ |
1255 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1256 | return 0; | |
1257 | ||
16b90839 VCG |
1258 | skb_pull(skb, sizeof(*rp)); |
1259 | ||
1c1def09 | 1260 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1261 | |
7034b911 VCG |
1262 | return 0; |
1263 | } | |
1264 | ||
1265 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1266 | { | |
16b90839 | 1267 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
1268 | struct l2cap_chan *chan = conn->smp; |
1269 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
1270 | struct hci_dev *hdev = conn->hcon->hdev; |
1271 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1272 | struct smp_ltk *ltk; |
c9839a11 | 1273 | u8 authenticated; |
16b90839 | 1274 | |
c46b98be JH |
1275 | BT_DBG("conn %p", conn); |
1276 | ||
1277 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1278 | return SMP_INVALID_PARAMS; |
c46b98be | 1279 | |
6131ddc8 JH |
1280 | /* Ignore this PDU if it wasn't requested */ |
1281 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1282 | return 0; | |
1283 | ||
9747a9f3 JH |
1284 | /* Mark the information as received */ |
1285 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1286 | ||
16b90839 | 1287 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1288 | |
c9839a11 | 1289 | hci_dev_lock(hdev); |
ce39fb4e | 1290 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1291 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1292 | authenticated, smp->tk, smp->enc_key_size, |
1293 | rp->ediv, rp->rand); | |
1294 | smp->ltk = ltk; | |
fd349c02 | 1295 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) |
d6268e86 | 1296 | smp_distribute_keys(smp); |
c9839a11 | 1297 | hci_dev_unlock(hdev); |
7034b911 VCG |
1298 | |
1299 | return 0; | |
1300 | } | |
1301 | ||
fd349c02 JH |
1302 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1303 | { | |
1304 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
1305 | struct l2cap_chan *chan = conn->smp; |
1306 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1307 | |
1308 | BT_DBG(""); | |
1309 | ||
1310 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1311 | return SMP_INVALID_PARAMS; |
fd349c02 | 1312 | |
6131ddc8 JH |
1313 | /* Ignore this PDU if it wasn't requested */ |
1314 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1315 | return 0; | |
1316 | ||
fd349c02 JH |
1317 | skb_pull(skb, sizeof(*info)); |
1318 | ||
1319 | memcpy(smp->irk, info->irk, 16); | |
1320 | ||
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1325 | struct sk_buff *skb) | |
1326 | { | |
1327 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
1328 | struct l2cap_chan *chan = conn->smp; |
1329 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1330 | struct hci_conn *hcon = conn->hcon; |
1331 | bdaddr_t rpa; | |
1332 | ||
1333 | BT_DBG(""); | |
1334 | ||
1335 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1336 | return SMP_INVALID_PARAMS; |
fd349c02 | 1337 | |
6131ddc8 JH |
1338 | /* Ignore this PDU if it wasn't requested */ |
1339 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1340 | return 0; | |
1341 | ||
9747a9f3 JH |
1342 | /* Mark the information as received */ |
1343 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1344 | ||
fd349c02 JH |
1345 | skb_pull(skb, sizeof(*info)); |
1346 | ||
31dd624e JH |
1347 | hci_dev_lock(hcon->hdev); |
1348 | ||
a9a58f86 JH |
1349 | /* Strictly speaking the Core Specification (4.1) allows sending |
1350 | * an empty address which would force us to rely on just the IRK | |
1351 | * as "identity information". However, since such | |
1352 | * implementations are not known of and in order to not over | |
1353 | * complicate our implementation, simply pretend that we never | |
1354 | * received an IRK for such a device. | |
1355 | */ | |
1356 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1357 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1358 | goto distribute; |
a9a58f86 JH |
1359 | } |
1360 | ||
fd349c02 JH |
1361 | bacpy(&smp->id_addr, &info->bdaddr); |
1362 | smp->id_addr_type = info->addr_type; | |
1363 | ||
1364 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1365 | bacpy(&rpa, &hcon->dst); | |
1366 | else | |
1367 | bacpy(&rpa, BDADDR_ANY); | |
1368 | ||
23d0e128 JH |
1369 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1370 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1371 | |
31dd624e | 1372 | distribute: |
d6268e86 | 1373 | smp_distribute_keys(smp); |
fd349c02 | 1374 | |
31dd624e JH |
1375 | hci_dev_unlock(hcon->hdev); |
1376 | ||
fd349c02 JH |
1377 | return 0; |
1378 | } | |
1379 | ||
7ee4ea36 MH |
1380 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1381 | { | |
1382 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
1383 | struct l2cap_chan *chan = conn->smp; |
1384 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
1385 | struct hci_dev *hdev = conn->hcon->hdev; |
1386 | struct smp_csrk *csrk; | |
1387 | ||
1388 | BT_DBG("conn %p", conn); | |
1389 | ||
1390 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1391 | return SMP_INVALID_PARAMS; |
7ee4ea36 MH |
1392 | |
1393 | /* Ignore this PDU if it wasn't requested */ | |
1394 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1395 | return 0; | |
1396 | ||
1397 | /* Mark the information as received */ | |
1398 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1399 | ||
1400 | skb_pull(skb, sizeof(*rp)); | |
1401 | ||
1402 | hci_dev_lock(hdev); | |
1403 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1404 | if (csrk) { | |
1405 | csrk->master = 0x01; | |
1406 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1407 | } | |
1408 | smp->csrk = csrk; | |
d6268e86 | 1409 | smp_distribute_keys(smp); |
7ee4ea36 MH |
1410 | hci_dev_unlock(hdev); |
1411 | ||
1412 | return 0; | |
1413 | } | |
1414 | ||
4befb867 | 1415 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 1416 | { |
5d88cc73 | 1417 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 1418 | struct hci_conn *hcon = conn->hcon; |
92381f5c | 1419 | __u8 code, reason; |
eb492e01 AB |
1420 | int err = 0; |
1421 | ||
7b9899db MH |
1422 | if (hcon->type != LE_LINK) { |
1423 | kfree_skb(skb); | |
3432711f | 1424 | return 0; |
7b9899db MH |
1425 | } |
1426 | ||
8ae9b984 | 1427 | if (skb->len < 1) |
92381f5c | 1428 | return -EILSEQ; |
92381f5c | 1429 | |
06ae3314 | 1430 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1431 | reason = SMP_PAIRING_NOTSUPP; |
1432 | goto done; | |
1433 | } | |
1434 | ||
92381f5c | 1435 | code = skb->data[0]; |
eb492e01 AB |
1436 | skb_pull(skb, sizeof(code)); |
1437 | ||
8cf9fa12 JH |
1438 | /* |
1439 | * The SMP context must be initialized for all other PDUs except | |
1440 | * pairing and security requests. If we get any other PDU when | |
1441 | * not initialized simply disconnect (done if this function | |
1442 | * returns an error). | |
1443 | */ | |
1444 | if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && | |
fc75cc86 | 1445 | !chan->data) { |
8cf9fa12 | 1446 | BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); |
8ae9b984 JH |
1447 | err = -EOPNOTSUPP; |
1448 | goto done; | |
8cf9fa12 JH |
1449 | } |
1450 | ||
eb492e01 AB |
1451 | switch (code) { |
1452 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1453 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1454 | break; |
1455 | ||
1456 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1457 | smp_failure(conn, 0); |
da85e5e5 | 1458 | err = -EPERM; |
eb492e01 AB |
1459 | break; |
1460 | ||
1461 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1462 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1463 | break; |
1464 | ||
1465 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1466 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1467 | break; |
1468 | ||
eb492e01 | 1469 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1470 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1471 | break; |
1472 | ||
eb492e01 | 1473 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1474 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1475 | break; |
1476 | ||
eb492e01 | 1477 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1478 | reason = smp_cmd_encrypt_info(conn, skb); |
1479 | break; | |
1480 | ||
eb492e01 | 1481 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1482 | reason = smp_cmd_master_ident(conn, skb); |
1483 | break; | |
1484 | ||
eb492e01 | 1485 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1486 | reason = smp_cmd_ident_info(conn, skb); |
1487 | break; | |
1488 | ||
eb492e01 | 1489 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1490 | reason = smp_cmd_ident_addr_info(conn, skb); |
1491 | break; | |
1492 | ||
eb492e01 | 1493 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1494 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1495 | break; |
1496 | ||
eb492e01 AB |
1497 | default: |
1498 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 1499 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 1500 | goto done; |
eb492e01 AB |
1501 | } |
1502 | ||
3a0259bb | 1503 | done: |
9b7b18ef JH |
1504 | if (!err) { |
1505 | if (reason) | |
1506 | smp_failure(conn, reason); | |
8ae9b984 | 1507 | kfree_skb(skb); |
9b7b18ef JH |
1508 | } |
1509 | ||
eb492e01 AB |
1510 | return err; |
1511 | } | |
7034b911 | 1512 | |
70db83c4 JH |
1513 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
1514 | { | |
1515 | struct l2cap_conn *conn = chan->conn; | |
1516 | ||
1517 | BT_DBG("chan %p", chan); | |
1518 | ||
fc75cc86 | 1519 | if (chan->data) |
5d88cc73 | 1520 | smp_chan_destroy(conn); |
5d88cc73 | 1521 | |
70db83c4 JH |
1522 | conn->smp = NULL; |
1523 | l2cap_chan_put(chan); | |
1524 | } | |
1525 | ||
44f1a7ab JH |
1526 | static void smp_resume_cb(struct l2cap_chan *chan) |
1527 | { | |
b68fda68 | 1528 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
1529 | struct l2cap_conn *conn = chan->conn; |
1530 | struct hci_conn *hcon = conn->hcon; | |
1531 | ||
1532 | BT_DBG("chan %p", chan); | |
1533 | ||
86d1407c JH |
1534 | if (!smp) |
1535 | return; | |
b68fda68 | 1536 | |
84bc0db5 JH |
1537 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
1538 | return; | |
1539 | ||
86d1407c JH |
1540 | cancel_delayed_work(&smp->security_timer); |
1541 | ||
d6268e86 | 1542 | smp_distribute_keys(smp); |
44f1a7ab JH |
1543 | } |
1544 | ||
70db83c4 JH |
1545 | static void smp_ready_cb(struct l2cap_chan *chan) |
1546 | { | |
1547 | struct l2cap_conn *conn = chan->conn; | |
1548 | ||
1549 | BT_DBG("chan %p", chan); | |
1550 | ||
1551 | conn->smp = chan; | |
1552 | l2cap_chan_hold(chan); | |
1553 | } | |
1554 | ||
4befb867 JH |
1555 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
1556 | { | |
1557 | int err; | |
1558 | ||
1559 | BT_DBG("chan %p", chan); | |
1560 | ||
1561 | err = smp_sig_channel(chan, skb); | |
1562 | if (err) { | |
b68fda68 | 1563 | struct smp_chan *smp = chan->data; |
4befb867 | 1564 | |
b68fda68 JH |
1565 | if (smp) |
1566 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 1567 | |
1e91c29e | 1568 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
1569 | } |
1570 | ||
1571 | return err; | |
1572 | } | |
1573 | ||
70db83c4 JH |
1574 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
1575 | unsigned long hdr_len, | |
1576 | unsigned long len, int nb) | |
1577 | { | |
1578 | struct sk_buff *skb; | |
1579 | ||
1580 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
1581 | if (!skb) | |
1582 | return ERR_PTR(-ENOMEM); | |
1583 | ||
1584 | skb->priority = HCI_PRIO_MAX; | |
1585 | bt_cb(skb)->chan = chan; | |
1586 | ||
1587 | return skb; | |
1588 | } | |
1589 | ||
1590 | static const struct l2cap_ops smp_chan_ops = { | |
1591 | .name = "Security Manager", | |
1592 | .ready = smp_ready_cb, | |
5d88cc73 | 1593 | .recv = smp_recv_cb, |
70db83c4 JH |
1594 | .alloc_skb = smp_alloc_skb_cb, |
1595 | .teardown = smp_teardown_cb, | |
44f1a7ab | 1596 | .resume = smp_resume_cb, |
70db83c4 JH |
1597 | |
1598 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
1599 | .state_change = l2cap_chan_no_state_change, |
1600 | .close = l2cap_chan_no_close, | |
1601 | .defer = l2cap_chan_no_defer, | |
1602 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
1603 | .set_shutdown = l2cap_chan_no_set_shutdown, |
1604 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1605 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1606 | }; | |
1607 | ||
1608 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
1609 | { | |
1610 | struct l2cap_chan *chan; | |
1611 | ||
1612 | BT_DBG("pchan %p", pchan); | |
1613 | ||
1614 | chan = l2cap_chan_create(); | |
1615 | if (!chan) | |
1616 | return NULL; | |
1617 | ||
1618 | chan->chan_type = pchan->chan_type; | |
1619 | chan->ops = &smp_chan_ops; | |
1620 | chan->scid = pchan->scid; | |
1621 | chan->dcid = chan->scid; | |
1622 | chan->imtu = pchan->imtu; | |
1623 | chan->omtu = pchan->omtu; | |
1624 | chan->mode = pchan->mode; | |
1625 | ||
1626 | BT_DBG("created chan %p", chan); | |
1627 | ||
1628 | return chan; | |
1629 | } | |
1630 | ||
1631 | static const struct l2cap_ops smp_root_chan_ops = { | |
1632 | .name = "Security Manager Root", | |
1633 | .new_connection = smp_new_conn_cb, | |
1634 | ||
1635 | /* None of these are implemented for the root channel */ | |
1636 | .close = l2cap_chan_no_close, | |
1637 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
1638 | .recv = l2cap_chan_no_recv, | |
1639 | .state_change = l2cap_chan_no_state_change, | |
1640 | .teardown = l2cap_chan_no_teardown, | |
1641 | .ready = l2cap_chan_no_ready, | |
1642 | .defer = l2cap_chan_no_defer, | |
1643 | .suspend = l2cap_chan_no_suspend, | |
1644 | .resume = l2cap_chan_no_resume, | |
1645 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1646 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1647 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1648 | }; | |
1649 | ||
711eafe3 JH |
1650 | int smp_register(struct hci_dev *hdev) |
1651 | { | |
70db83c4 | 1652 | struct l2cap_chan *chan; |
defce9e8 | 1653 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 1654 | |
711eafe3 JH |
1655 | BT_DBG("%s", hdev->name); |
1656 | ||
defce9e8 JH |
1657 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
1658 | if (IS_ERR(tfm_aes)) { | |
1659 | int err = PTR_ERR(tfm_aes); | |
711eafe3 | 1660 | BT_ERR("Unable to create crypto context"); |
711eafe3 JH |
1661 | return err; |
1662 | } | |
1663 | ||
70db83c4 JH |
1664 | chan = l2cap_chan_create(); |
1665 | if (!chan) { | |
defce9e8 | 1666 | crypto_free_blkcipher(tfm_aes); |
70db83c4 JH |
1667 | return -ENOMEM; |
1668 | } | |
1669 | ||
defce9e8 JH |
1670 | chan->data = tfm_aes; |
1671 | ||
5d88cc73 | 1672 | l2cap_add_scid(chan, L2CAP_CID_SMP); |
70db83c4 JH |
1673 | |
1674 | l2cap_chan_set_defaults(chan); | |
1675 | ||
1676 | bacpy(&chan->src, &hdev->bdaddr); | |
1677 | chan->src_type = BDADDR_LE_PUBLIC; | |
1678 | chan->state = BT_LISTEN; | |
1679 | chan->mode = L2CAP_MODE_BASIC; | |
1680 | chan->imtu = L2CAP_DEFAULT_MTU; | |
1681 | chan->ops = &smp_root_chan_ops; | |
1682 | ||
1683 | hdev->smp_data = chan; | |
1684 | ||
711eafe3 JH |
1685 | return 0; |
1686 | } | |
1687 | ||
1688 | void smp_unregister(struct hci_dev *hdev) | |
1689 | { | |
70db83c4 | 1690 | struct l2cap_chan *chan = hdev->smp_data; |
defce9e8 | 1691 | struct crypto_blkcipher *tfm_aes; |
70db83c4 JH |
1692 | |
1693 | if (!chan) | |
1694 | return; | |
1695 | ||
1696 | BT_DBG("%s chan %p", hdev->name, chan); | |
711eafe3 | 1697 | |
defce9e8 JH |
1698 | tfm_aes = chan->data; |
1699 | if (tfm_aes) { | |
1700 | chan->data = NULL; | |
1701 | crypto_free_blkcipher(tfm_aes); | |
711eafe3 | 1702 | } |
70db83c4 JH |
1703 | |
1704 | hdev->smp_data = NULL; | |
1705 | l2cap_chan_put(chan); | |
711eafe3 | 1706 | } |