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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 | |
b28b4943 | 34 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 35 | |
17b02e62 | 36 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 37 | |
065a13e2 | 38 | #define AUTH_REQ_MASK 0x07 |
88d3a8ac | 39 | #define KEY_DIST_MASK 0x07 |
065a13e2 | 40 | |
533e35d4 JH |
41 | enum { |
42 | SMP_FLAG_TK_VALID, | |
43 | SMP_FLAG_CFM_PENDING, | |
44 | SMP_FLAG_MITM_AUTH, | |
45 | SMP_FLAG_COMPLETE, | |
46 | SMP_FLAG_INITIATOR, | |
47 | }; | |
4bc58f51 JH |
48 | |
49 | struct smp_chan { | |
b68fda68 JH |
50 | struct l2cap_conn *conn; |
51 | struct delayed_work security_timer; | |
b28b4943 | 52 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 53 | |
4bc58f51 JH |
54 | u8 preq[7]; /* SMP Pairing Request */ |
55 | u8 prsp[7]; /* SMP Pairing Response */ | |
56 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
57 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
58 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
59 | u8 tk[16]; /* SMP Temporary Key */ | |
60 | u8 enc_key_size; | |
61 | u8 remote_key_dist; | |
62 | bdaddr_t id_addr; | |
63 | u8 id_addr_type; | |
64 | u8 irk[16]; | |
65 | struct smp_csrk *csrk; | |
66 | struct smp_csrk *slave_csrk; | |
67 | struct smp_ltk *ltk; | |
68 | struct smp_ltk *slave_ltk; | |
69 | struct smp_irk *remote_irk; | |
4a74d658 | 70 | unsigned long flags; |
6a7bd103 JH |
71 | |
72 | struct crypto_blkcipher *tfm_aes; | |
4bc58f51 JH |
73 | }; |
74 | ||
8a2936f4 | 75 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 76 | { |
8a2936f4 | 77 | size_t i; |
d22ef0bc | 78 | |
8a2936f4 JH |
79 | for (i = 0; i < len; i++) |
80 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
81 | } |
82 | ||
83 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
84 | { | |
85 | struct blkcipher_desc desc; | |
86 | struct scatterlist sg; | |
943a732a | 87 | uint8_t tmp[16], data[16]; |
201a5929 | 88 | int err; |
d22ef0bc AB |
89 | |
90 | if (tfm == NULL) { | |
91 | BT_ERR("tfm %p", tfm); | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
95 | desc.tfm = tfm; | |
96 | desc.flags = 0; | |
97 | ||
943a732a | 98 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 99 | swap_buf(k, tmp, 16); |
943a732a JH |
100 | |
101 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
102 | if (err) { |
103 | BT_ERR("cipher setkey failed: %d", err); | |
104 | return err; | |
105 | } | |
106 | ||
943a732a | 107 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 108 | swap_buf(r, data, 16); |
943a732a JH |
109 | |
110 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 111 | |
d22ef0bc AB |
112 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
113 | if (err) | |
114 | BT_ERR("Encrypt data error %d", err); | |
115 | ||
943a732a | 116 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 117 | swap_buf(data, r, 16); |
943a732a | 118 | |
d22ef0bc AB |
119 | return err; |
120 | } | |
121 | ||
60478054 JH |
122 | static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3]) |
123 | { | |
943a732a | 124 | u8 _res[16]; |
60478054 JH |
125 | int err; |
126 | ||
127 | /* r' = padding || r */ | |
943a732a JH |
128 | memcpy(_res, r, 3); |
129 | memset(_res + 3, 0, 13); | |
60478054 | 130 | |
943a732a | 131 | err = smp_e(tfm, irk, _res); |
60478054 JH |
132 | if (err) { |
133 | BT_ERR("Encrypt error"); | |
134 | return err; | |
135 | } | |
136 | ||
137 | /* The output of the random address function ah is: | |
138 | * ah(h, r) = e(k, r') mod 2^24 | |
139 | * The output of the security function e is then truncated to 24 bits | |
140 | * by taking the least significant 24 bits of the output of e as the | |
141 | * result of ah. | |
142 | */ | |
943a732a | 143 | memcpy(res, _res, 3); |
60478054 JH |
144 | |
145 | return 0; | |
146 | } | |
147 | ||
defce9e8 | 148 | bool smp_irk_matches(struct hci_dev *hdev, u8 irk[16], bdaddr_t *bdaddr) |
60478054 | 149 | { |
defce9e8 JH |
150 | struct l2cap_chan *chan = hdev->smp_data; |
151 | struct crypto_blkcipher *tfm; | |
60478054 JH |
152 | u8 hash[3]; |
153 | int err; | |
154 | ||
defce9e8 JH |
155 | if (!chan || !chan->data) |
156 | return false; | |
157 | ||
158 | tfm = chan->data; | |
159 | ||
60478054 JH |
160 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
161 | ||
162 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
163 | if (err) | |
164 | return false; | |
165 | ||
166 | return !memcmp(bdaddr->b, hash, 3); | |
167 | } | |
168 | ||
defce9e8 | 169 | int smp_generate_rpa(struct hci_dev *hdev, u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 170 | { |
defce9e8 JH |
171 | struct l2cap_chan *chan = hdev->smp_data; |
172 | struct crypto_blkcipher *tfm; | |
b1e2b3ae JH |
173 | int err; |
174 | ||
defce9e8 JH |
175 | if (!chan || !chan->data) |
176 | return -EOPNOTSUPP; | |
177 | ||
178 | tfm = chan->data; | |
179 | ||
b1e2b3ae JH |
180 | get_random_bytes(&rpa->b[3], 3); |
181 | ||
182 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
183 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
184 | ||
185 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
186 | if (err < 0) | |
187 | return err; | |
188 | ||
189 | BT_DBG("RPA %pMR", rpa); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
e491eaf3 JH |
194 | static int smp_c1(struct crypto_blkcipher *tfm_aes, u8 k[16], u8 r[16], |
195 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, u8 _rat, | |
196 | bdaddr_t *ra, u8 res[16]) | |
d22ef0bc AB |
197 | { |
198 | u8 p1[16], p2[16]; | |
199 | int err; | |
200 | ||
201 | memset(p1, 0, 16); | |
202 | ||
203 | /* p1 = pres || preq || _rat || _iat */ | |
943a732a JH |
204 | p1[0] = _iat; |
205 | p1[1] = _rat; | |
206 | memcpy(p1 + 2, preq, 7); | |
207 | memcpy(p1 + 9, pres, 7); | |
d22ef0bc AB |
208 | |
209 | /* p2 = padding || ia || ra */ | |
943a732a JH |
210 | memcpy(p2, ra, 6); |
211 | memcpy(p2 + 6, ia, 6); | |
212 | memset(p2 + 12, 0, 4); | |
d22ef0bc AB |
213 | |
214 | /* res = r XOR p1 */ | |
215 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
216 | ||
217 | /* res = e(k, res) */ | |
e491eaf3 | 218 | err = smp_e(tfm_aes, k, res); |
d22ef0bc AB |
219 | if (err) { |
220 | BT_ERR("Encrypt data error"); | |
221 | return err; | |
222 | } | |
223 | ||
224 | /* res = res XOR p2 */ | |
225 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
226 | ||
227 | /* res = e(k, res) */ | |
e491eaf3 | 228 | err = smp_e(tfm_aes, k, res); |
d22ef0bc AB |
229 | if (err) |
230 | BT_ERR("Encrypt data error"); | |
231 | ||
232 | return err; | |
233 | } | |
234 | ||
e491eaf3 JH |
235 | static int smp_s1(struct crypto_blkcipher *tfm_aes, u8 k[16], u8 r1[16], |
236 | u8 r2[16], u8 _r[16]) | |
d22ef0bc AB |
237 | { |
238 | int err; | |
239 | ||
240 | /* Just least significant octets from r1 and r2 are considered */ | |
943a732a JH |
241 | memcpy(_r, r2, 8); |
242 | memcpy(_r + 8, r1, 8); | |
d22ef0bc | 243 | |
e491eaf3 | 244 | err = smp_e(tfm_aes, k, _r); |
d22ef0bc AB |
245 | if (err) |
246 | BT_ERR("Encrypt data error"); | |
247 | ||
248 | return err; | |
249 | } | |
250 | ||
5d88cc73 | 251 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 252 | { |
5d88cc73 | 253 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 254 | struct smp_chan *smp; |
5d88cc73 JH |
255 | struct kvec iv[2]; |
256 | struct msghdr msg; | |
eb492e01 | 257 | |
5d88cc73 JH |
258 | if (!chan) |
259 | return; | |
eb492e01 | 260 | |
5d88cc73 | 261 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 262 | |
5d88cc73 JH |
263 | iv[0].iov_base = &code; |
264 | iv[0].iov_len = 1; | |
eb492e01 | 265 | |
5d88cc73 JH |
266 | iv[1].iov_base = data; |
267 | iv[1].iov_len = len; | |
eb492e01 | 268 | |
5d88cc73 | 269 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 270 | |
5d88cc73 JH |
271 | msg.msg_iov = (struct iovec *) &iv; |
272 | msg.msg_iovlen = 2; | |
eb492e01 | 273 | |
5d88cc73 | 274 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 275 | |
b68fda68 JH |
276 | if (!chan->data) |
277 | return; | |
278 | ||
279 | smp = chan->data; | |
280 | ||
281 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 282 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
283 | } |
284 | ||
2b64d153 BG |
285 | static __u8 authreq_to_seclevel(__u8 authreq) |
286 | { | |
287 | if (authreq & SMP_AUTH_MITM) | |
288 | return BT_SECURITY_HIGH; | |
289 | else | |
290 | return BT_SECURITY_MEDIUM; | |
291 | } | |
292 | ||
293 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
294 | { | |
295 | switch (sec_level) { | |
296 | case BT_SECURITY_HIGH: | |
297 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
298 | case BT_SECURITY_MEDIUM: | |
299 | return SMP_AUTH_BONDING; | |
300 | default: | |
301 | return SMP_AUTH_NONE; | |
302 | } | |
303 | } | |
304 | ||
b8e66eac | 305 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
306 | struct smp_cmd_pairing *req, |
307 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 308 | { |
5d88cc73 JH |
309 | struct l2cap_chan *chan = conn->smp; |
310 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
311 | struct hci_conn *hcon = conn->hcon; |
312 | struct hci_dev *hdev = hcon->hdev; | |
313 | u8 local_dist = 0, remote_dist = 0; | |
54790f73 | 314 | |
b6ae8457 | 315 | if (test_bit(HCI_BONDABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
316 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
317 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 318 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
319 | } else { |
320 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
321 | } |
322 | ||
fd349c02 JH |
323 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
324 | remote_dist |= SMP_DIST_ID_KEY; | |
325 | ||
863efaf2 JH |
326 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
327 | local_dist |= SMP_DIST_ID_KEY; | |
328 | ||
54790f73 VCG |
329 | if (rsp == NULL) { |
330 | req->io_capability = conn->hcon->io_capability; | |
331 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
332 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
333 | req->init_key_dist = local_dist; |
334 | req->resp_key_dist = remote_dist; | |
065a13e2 | 335 | req->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
336 | |
337 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
338 | return; |
339 | } | |
340 | ||
341 | rsp->io_capability = conn->hcon->io_capability; | |
342 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
343 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
344 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
345 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
065a13e2 | 346 | rsp->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
347 | |
348 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
349 | } |
350 | ||
3158c50c VCG |
351 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
352 | { | |
5d88cc73 JH |
353 | struct l2cap_chan *chan = conn->smp; |
354 | struct smp_chan *smp = chan->data; | |
1c1def09 | 355 | |
3158c50c | 356 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 357 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
358 | return SMP_ENC_KEY_SIZE; |
359 | ||
f7aa611a | 360 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
361 | |
362 | return 0; | |
363 | } | |
364 | ||
6f48e260 JH |
365 | static void smp_chan_destroy(struct l2cap_conn *conn) |
366 | { | |
367 | struct l2cap_chan *chan = conn->smp; | |
368 | struct smp_chan *smp = chan->data; | |
369 | bool complete; | |
370 | ||
371 | BUG_ON(!smp); | |
372 | ||
373 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 374 | |
6f48e260 JH |
375 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
376 | mgmt_smp_complete(conn->hcon, complete); | |
377 | ||
378 | kfree(smp->csrk); | |
379 | kfree(smp->slave_csrk); | |
380 | ||
381 | crypto_free_blkcipher(smp->tfm_aes); | |
382 | ||
383 | /* If pairing failed clean up any keys we might have */ | |
384 | if (!complete) { | |
385 | if (smp->ltk) { | |
386 | list_del(&smp->ltk->list); | |
387 | kfree(smp->ltk); | |
388 | } | |
389 | ||
390 | if (smp->slave_ltk) { | |
391 | list_del(&smp->slave_ltk->list); | |
392 | kfree(smp->slave_ltk); | |
393 | } | |
394 | ||
395 | if (smp->remote_irk) { | |
396 | list_del(&smp->remote_irk->list); | |
397 | kfree(smp->remote_irk); | |
398 | } | |
399 | } | |
400 | ||
401 | chan->data = NULL; | |
402 | kfree(smp); | |
403 | hci_conn_drop(conn->hcon); | |
404 | } | |
405 | ||
84794e11 | 406 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 407 | { |
bab73cb6 | 408 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 409 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 410 | |
84794e11 | 411 | if (reason) |
4f957a76 | 412 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 413 | &reason); |
4f957a76 | 414 | |
ce39fb4e | 415 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
e1e930f5 | 416 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 417 | |
fc75cc86 | 418 | if (chan->data) |
f1c09c07 | 419 | smp_chan_destroy(conn); |
4f957a76 BG |
420 | } |
421 | ||
2b64d153 BG |
422 | #define JUST_WORKS 0x00 |
423 | #define JUST_CFM 0x01 | |
424 | #define REQ_PASSKEY 0x02 | |
425 | #define CFM_PASSKEY 0x03 | |
426 | #define REQ_OOB 0x04 | |
427 | #define OVERLAP 0xFF | |
428 | ||
429 | static const u8 gen_method[5][5] = { | |
430 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
431 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
432 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
433 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
434 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
435 | }; | |
436 | ||
581370cc JH |
437 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
438 | { | |
2bcd4003 JH |
439 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
440 | * converted later to JUST_WORKS if we're initiators. | |
441 | */ | |
581370cc JH |
442 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
443 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 444 | return JUST_CFM; |
581370cc JH |
445 | |
446 | return gen_method[remote_io][local_io]; | |
447 | } | |
448 | ||
2b64d153 BG |
449 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
450 | u8 local_io, u8 remote_io) | |
451 | { | |
452 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
453 | struct l2cap_chan *chan = conn->smp; |
454 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
455 | u8 method; |
456 | u32 passkey = 0; | |
457 | int ret = 0; | |
458 | ||
459 | /* Initialize key for JUST WORKS */ | |
460 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 461 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
462 | |
463 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
464 | ||
2bcd4003 JH |
465 | /* If neither side wants MITM, either "just" confirm an incoming |
466 | * request or use just-works for outgoing ones. The JUST_CFM | |
467 | * will be converted to JUST_WORKS if necessary later in this | |
468 | * function. If either side has MITM look up the method from the | |
469 | * table. | |
470 | */ | |
581370cc | 471 | if (!(auth & SMP_AUTH_MITM)) |
2bcd4003 | 472 | method = JUST_CFM; |
2b64d153 | 473 | else |
581370cc | 474 | method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 475 | |
a82505c7 | 476 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 477 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
478 | method = JUST_WORKS; |
479 | ||
02f3e254 JH |
480 | /* Don't bother user space with no IO capabilities */ |
481 | if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
482 | method = JUST_WORKS; | |
483 | ||
2b64d153 BG |
484 | /* If Just Works, Continue with Zero TK */ |
485 | if (method == JUST_WORKS) { | |
4a74d658 | 486 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
487 | return 0; |
488 | } | |
489 | ||
490 | /* Not Just Works/Confirm results in MITM Authentication */ | |
5eb596f5 | 491 | if (method != JUST_CFM) { |
4a74d658 | 492 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
493 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
494 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
495 | } | |
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 | ||
e491eaf3 | 544 | ret = smp_c1(smp->tfm_aes, 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 | ||
b28b4943 JH |
555 | if (conn->hcon->out) |
556 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
557 | else | |
558 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
559 | ||
1cc61144 | 560 | return 0; |
8aab4757 VCG |
561 | } |
562 | ||
861580a9 | 563 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 564 | { |
8aab4757 VCG |
565 | struct l2cap_conn *conn = smp->conn; |
566 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 567 | u8 confirm[16]; |
8aab4757 VCG |
568 | int ret; |
569 | ||
ec70f36f | 570 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 571 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
572 | |
573 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
574 | ||
e491eaf3 | 575 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 576 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 577 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
578 | if (ret) |
579 | return SMP_UNSPECIFIED; | |
8aab4757 | 580 | |
8aab4757 VCG |
581 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
582 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 583 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
584 | } |
585 | ||
586 | if (hcon->out) { | |
fe39c7b2 MH |
587 | u8 stk[16]; |
588 | __le64 rand = 0; | |
589 | __le16 ediv = 0; | |
8aab4757 | 590 | |
e491eaf3 | 591 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 592 | |
f7aa611a | 593 | memset(stk + smp->enc_key_size, 0, |
04124681 | 594 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 595 | |
861580a9 JH |
596 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
597 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
598 | |
599 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 600 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 601 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 602 | } else { |
fff3490f | 603 | u8 stk[16], auth; |
fe39c7b2 MH |
604 | __le64 rand = 0; |
605 | __le16 ediv = 0; | |
8aab4757 | 606 | |
943a732a JH |
607 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
608 | smp->prnd); | |
8aab4757 | 609 | |
e491eaf3 | 610 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 611 | |
f7aa611a | 612 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 613 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 614 | |
fff3490f JH |
615 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
616 | auth = 1; | |
617 | else | |
618 | auth = 0; | |
619 | ||
7d5843b7 JH |
620 | /* Even though there's no _SLAVE suffix this is the |
621 | * slave STK we're adding for later lookup (the master | |
622 | * STK never needs to be stored). | |
623 | */ | |
ce39fb4e | 624 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 625 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
626 | } |
627 | ||
861580a9 | 628 | return 0; |
8aab4757 VCG |
629 | } |
630 | ||
44f1a7ab JH |
631 | static void smp_notify_keys(struct l2cap_conn *conn) |
632 | { | |
633 | struct l2cap_chan *chan = conn->smp; | |
634 | struct smp_chan *smp = chan->data; | |
635 | struct hci_conn *hcon = conn->hcon; | |
636 | struct hci_dev *hdev = hcon->hdev; | |
637 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
638 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
639 | bool persistent; | |
640 | ||
641 | if (smp->remote_irk) { | |
642 | mgmt_new_irk(hdev, smp->remote_irk); | |
643 | /* Now that user space can be considered to know the | |
644 | * identity address track the connection based on it | |
645 | * from now on. | |
646 | */ | |
647 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
648 | hcon->dst_type = smp->remote_irk->addr_type; | |
f3d82d0c | 649 | queue_work(hdev->workqueue, &conn->id_addr_update_work); |
44f1a7ab JH |
650 | |
651 | /* When receiving an indentity resolving key for | |
652 | * a remote device that does not use a resolvable | |
653 | * private address, just remove the key so that | |
654 | * it is possible to use the controller white | |
655 | * list for scanning. | |
656 | * | |
657 | * Userspace will have been told to not store | |
658 | * this key at this point. So it is safe to | |
659 | * just remove it. | |
660 | */ | |
661 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
662 | list_del(&smp->remote_irk->list); | |
663 | kfree(smp->remote_irk); | |
664 | smp->remote_irk = NULL; | |
665 | } | |
666 | } | |
667 | ||
668 | /* The LTKs and CSRKs should be persistent only if both sides | |
669 | * had the bonding bit set in their authentication requests. | |
670 | */ | |
671 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
672 | ||
673 | if (smp->csrk) { | |
674 | smp->csrk->bdaddr_type = hcon->dst_type; | |
675 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
676 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
677 | } | |
678 | ||
679 | if (smp->slave_csrk) { | |
680 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
681 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
682 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
683 | } | |
684 | ||
685 | if (smp->ltk) { | |
686 | smp->ltk->bdaddr_type = hcon->dst_type; | |
687 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
688 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
689 | } | |
690 | ||
691 | if (smp->slave_ltk) { | |
692 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
693 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
694 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
695 | } | |
696 | } | |
697 | ||
b28b4943 JH |
698 | static void smp_allow_key_dist(struct smp_chan *smp) |
699 | { | |
700 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
701 | * will be allowed in each PDU handler to ensure we receive | |
702 | * them in the correct order. | |
703 | */ | |
704 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
705 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
706 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
707 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
708 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
709 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
710 | } | |
711 | ||
d6268e86 | 712 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
713 | { |
714 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 715 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
716 | struct hci_conn *hcon = conn->hcon; |
717 | struct hci_dev *hdev = hcon->hdev; | |
718 | __u8 *keydist; | |
719 | ||
720 | BT_DBG("conn %p", conn); | |
721 | ||
44f1a7ab JH |
722 | rsp = (void *) &smp->prsp[1]; |
723 | ||
724 | /* The responder sends its keys first */ | |
b28b4943 JH |
725 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
726 | smp_allow_key_dist(smp); | |
86d1407c | 727 | return; |
b28b4943 | 728 | } |
44f1a7ab JH |
729 | |
730 | req = (void *) &smp->preq[1]; | |
731 | ||
732 | if (hcon->out) { | |
733 | keydist = &rsp->init_key_dist; | |
734 | *keydist &= req->init_key_dist; | |
735 | } else { | |
736 | keydist = &rsp->resp_key_dist; | |
737 | *keydist &= req->resp_key_dist; | |
738 | } | |
739 | ||
740 | BT_DBG("keydist 0x%x", *keydist); | |
741 | ||
742 | if (*keydist & SMP_DIST_ENC_KEY) { | |
743 | struct smp_cmd_encrypt_info enc; | |
744 | struct smp_cmd_master_ident ident; | |
745 | struct smp_ltk *ltk; | |
746 | u8 authenticated; | |
747 | __le16 ediv; | |
748 | __le64 rand; | |
749 | ||
750 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
751 | get_random_bytes(&ediv, sizeof(ediv)); | |
752 | get_random_bytes(&rand, sizeof(rand)); | |
753 | ||
754 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
755 | ||
756 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
757 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
758 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
759 | smp->enc_key_size, ediv, rand); | |
760 | smp->slave_ltk = ltk; | |
761 | ||
762 | ident.ediv = ediv; | |
763 | ident.rand = rand; | |
764 | ||
765 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
766 | ||
767 | *keydist &= ~SMP_DIST_ENC_KEY; | |
768 | } | |
769 | ||
770 | if (*keydist & SMP_DIST_ID_KEY) { | |
771 | struct smp_cmd_ident_addr_info addrinfo; | |
772 | struct smp_cmd_ident_info idinfo; | |
773 | ||
774 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
775 | ||
776 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
777 | ||
778 | /* The hci_conn contains the local identity address | |
779 | * after the connection has been established. | |
780 | * | |
781 | * This is true even when the connection has been | |
782 | * established using a resolvable random address. | |
783 | */ | |
784 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
785 | addrinfo.addr_type = hcon->src_type; | |
786 | ||
787 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
788 | &addrinfo); | |
789 | ||
790 | *keydist &= ~SMP_DIST_ID_KEY; | |
791 | } | |
792 | ||
793 | if (*keydist & SMP_DIST_SIGN) { | |
794 | struct smp_cmd_sign_info sign; | |
795 | struct smp_csrk *csrk; | |
796 | ||
797 | /* Generate a new random key */ | |
798 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
799 | ||
800 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
801 | if (csrk) { | |
802 | csrk->master = 0x00; | |
803 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
804 | } | |
805 | smp->slave_csrk = csrk; | |
806 | ||
807 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
808 | ||
809 | *keydist &= ~SMP_DIST_SIGN; | |
810 | } | |
811 | ||
812 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
813 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
814 | smp_allow_key_dist(smp); | |
86d1407c | 815 | return; |
b28b4943 | 816 | } |
44f1a7ab | 817 | |
44f1a7ab JH |
818 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
819 | smp_notify_keys(conn); | |
820 | ||
821 | smp_chan_destroy(conn); | |
44f1a7ab JH |
822 | } |
823 | ||
b68fda68 JH |
824 | static void smp_timeout(struct work_struct *work) |
825 | { | |
826 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
827 | security_timer.work); | |
828 | struct l2cap_conn *conn = smp->conn; | |
829 | ||
830 | BT_DBG("conn %p", conn); | |
831 | ||
1e91c29e | 832 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
833 | } |
834 | ||
8aab4757 VCG |
835 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
836 | { | |
5d88cc73 | 837 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
838 | struct smp_chan *smp; |
839 | ||
f1560463 | 840 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 841 | if (!smp) |
8aab4757 VCG |
842 | return NULL; |
843 | ||
6a7bd103 JH |
844 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
845 | if (IS_ERR(smp->tfm_aes)) { | |
846 | BT_ERR("Unable to create ECB crypto context"); | |
847 | kfree(smp); | |
848 | return NULL; | |
849 | } | |
850 | ||
8aab4757 | 851 | smp->conn = conn; |
5d88cc73 | 852 | chan->data = smp; |
8aab4757 | 853 | |
b28b4943 JH |
854 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
855 | ||
b68fda68 JH |
856 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
857 | ||
8aab4757 VCG |
858 | hci_conn_hold(conn->hcon); |
859 | ||
860 | return smp; | |
861 | } | |
862 | ||
2b64d153 BG |
863 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
864 | { | |
b10e8017 | 865 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 866 | struct l2cap_chan *chan; |
2b64d153 BG |
867 | struct smp_chan *smp; |
868 | u32 value; | |
fc75cc86 | 869 | int err; |
2b64d153 BG |
870 | |
871 | BT_DBG(""); | |
872 | ||
fc75cc86 | 873 | if (!conn) |
2b64d153 BG |
874 | return -ENOTCONN; |
875 | ||
5d88cc73 JH |
876 | chan = conn->smp; |
877 | if (!chan) | |
878 | return -ENOTCONN; | |
879 | ||
fc75cc86 JH |
880 | l2cap_chan_lock(chan); |
881 | if (!chan->data) { | |
882 | err = -ENOTCONN; | |
883 | goto unlock; | |
884 | } | |
885 | ||
5d88cc73 | 886 | smp = chan->data; |
2b64d153 BG |
887 | |
888 | switch (mgmt_op) { | |
889 | case MGMT_OP_USER_PASSKEY_REPLY: | |
890 | value = le32_to_cpu(passkey); | |
943a732a | 891 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 892 | BT_DBG("PassKey: %d", value); |
943a732a | 893 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
894 | /* Fall Through */ |
895 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 896 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
897 | break; |
898 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
899 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 900 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
901 | err = 0; |
902 | goto unlock; | |
2b64d153 | 903 | default: |
84794e11 | 904 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
905 | err = -EOPNOTSUPP; |
906 | goto unlock; | |
2b64d153 BG |
907 | } |
908 | ||
fc75cc86 JH |
909 | err = 0; |
910 | ||
2b64d153 | 911 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
912 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
913 | u8 rsp = smp_confirm(smp); | |
914 | if (rsp) | |
915 | smp_failure(conn, rsp); | |
916 | } | |
2b64d153 | 917 | |
fc75cc86 JH |
918 | unlock: |
919 | l2cap_chan_unlock(chan); | |
920 | return err; | |
2b64d153 BG |
921 | } |
922 | ||
da85e5e5 | 923 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 924 | { |
3158c50c | 925 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 926 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 927 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 928 | struct smp_chan *smp; |
c7262e71 | 929 | u8 key_size, auth, sec_level; |
8aab4757 | 930 | int ret; |
88ba43b6 AB |
931 | |
932 | BT_DBG("conn %p", conn); | |
933 | ||
c46b98be | 934 | if (skb->len < sizeof(*req)) |
38e4a915 | 935 | return SMP_INVALID_PARAMS; |
c46b98be | 936 | |
40bef302 | 937 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
938 | return SMP_CMD_NOTSUPP; |
939 | ||
fc75cc86 | 940 | if (!chan->data) |
8aab4757 | 941 | smp = smp_chan_create(conn); |
fc75cc86 | 942 | else |
5d88cc73 | 943 | smp = chan->data; |
8aab4757 | 944 | |
d08fd0e7 AE |
945 | if (!smp) |
946 | return SMP_UNSPECIFIED; | |
d26a2345 | 947 | |
c05b9339 JH |
948 | /* We didn't start the pairing, so match remote */ |
949 | auth = req->auth_req & AUTH_REQ_MASK; | |
950 | ||
b6ae8457 | 951 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
c05b9339 | 952 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
953 | return SMP_PAIRING_NOTSUPP; |
954 | ||
1c1def09 VCG |
955 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
956 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 957 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 958 | |
5be5e275 | 959 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
960 | sec_level = BT_SECURITY_MEDIUM; |
961 | else | |
962 | sec_level = authreq_to_seclevel(auth); | |
963 | ||
c7262e71 JH |
964 | if (sec_level > conn->hcon->pending_sec_level) |
965 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 966 | |
2ed8f65c JH |
967 | /* If we need MITM check that it can be acheived */ |
968 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
969 | u8 method; | |
970 | ||
971 | method = get_auth_method(smp, conn->hcon->io_capability, | |
972 | req->io_capability); | |
973 | if (method == JUST_WORKS || method == JUST_CFM) | |
974 | return SMP_AUTH_REQUIREMENTS; | |
975 | } | |
976 | ||
2b64d153 | 977 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
978 | |
979 | key_size = min(req->max_key_size, rsp.max_key_size); | |
980 | if (check_enc_key_size(conn, key_size)) | |
981 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 982 | |
e84a6b13 | 983 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 984 | |
1c1def09 VCG |
985 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
986 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 987 | |
3158c50c | 988 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
b28b4943 | 989 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
da85e5e5 | 990 | |
2b64d153 BG |
991 | /* Request setup of TK */ |
992 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
993 | if (ret) | |
994 | return SMP_UNSPECIFIED; | |
995 | ||
da85e5e5 | 996 | return 0; |
88ba43b6 AB |
997 | } |
998 | ||
da85e5e5 | 999 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1000 | { |
3158c50c | 1001 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1002 | struct l2cap_chan *chan = conn->smp; |
1003 | struct smp_chan *smp = chan->data; | |
3a7dbfb8 | 1004 | u8 key_size, auth; |
7d24ddcc | 1005 | int ret; |
88ba43b6 AB |
1006 | |
1007 | BT_DBG("conn %p", conn); | |
1008 | ||
c46b98be | 1009 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1010 | return SMP_INVALID_PARAMS; |
c46b98be | 1011 | |
40bef302 | 1012 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1013 | return SMP_CMD_NOTSUPP; |
1014 | ||
3158c50c VCG |
1015 | skb_pull(skb, sizeof(*rsp)); |
1016 | ||
1c1def09 | 1017 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1018 | |
3158c50c VCG |
1019 | key_size = min(req->max_key_size, rsp->max_key_size); |
1020 | if (check_enc_key_size(conn, key_size)) | |
1021 | return SMP_ENC_KEY_SIZE; | |
1022 | ||
c05b9339 JH |
1023 | auth = rsp->auth_req & AUTH_REQ_MASK; |
1024 | ||
2ed8f65c JH |
1025 | /* If we need MITM check that it can be acheived */ |
1026 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
1027 | u8 method; | |
1028 | ||
1029 | method = get_auth_method(smp, req->io_capability, | |
1030 | rsp->io_capability); | |
1031 | if (method == JUST_WORKS || method == JUST_CFM) | |
1032 | return SMP_AUTH_REQUIREMENTS; | |
1033 | } | |
1034 | ||
e84a6b13 | 1035 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1036 | |
8aab4757 VCG |
1037 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1038 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 1039 | |
fdcc4bec JH |
1040 | /* Update remote key distribution in case the remote cleared |
1041 | * some bits that we had enabled in our request. | |
1042 | */ | |
1043 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1044 | ||
c05b9339 | 1045 | auth |= req->auth_req; |
2b64d153 | 1046 | |
476585ec | 1047 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1048 | if (ret) |
1049 | return SMP_UNSPECIFIED; | |
1050 | ||
4a74d658 | 1051 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1052 | |
1053 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1054 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1055 | return smp_confirm(smp); |
da85e5e5 VCG |
1056 | |
1057 | return 0; | |
88ba43b6 AB |
1058 | } |
1059 | ||
da85e5e5 | 1060 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1061 | { |
5d88cc73 JH |
1062 | struct l2cap_chan *chan = conn->smp; |
1063 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1064 | |
88ba43b6 AB |
1065 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
1066 | ||
c46b98be | 1067 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 1068 | return SMP_INVALID_PARAMS; |
c46b98be | 1069 | |
1c1def09 VCG |
1070 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
1071 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 1072 | |
b28b4943 | 1073 | if (conn->hcon->out) { |
943a732a JH |
1074 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1075 | smp->prnd); | |
b28b4943 JH |
1076 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 1081 | return smp_confirm(smp); |
943a732a | 1082 | else |
4a74d658 | 1083 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
1084 | |
1085 | return 0; | |
88ba43b6 AB |
1086 | } |
1087 | ||
da85e5e5 | 1088 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1089 | { |
5d88cc73 JH |
1090 | struct l2cap_chan *chan = conn->smp; |
1091 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1092 | |
8aab4757 | 1093 | BT_DBG("conn %p", conn); |
3158c50c | 1094 | |
c46b98be | 1095 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 1096 | return SMP_INVALID_PARAMS; |
c46b98be | 1097 | |
943a732a | 1098 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 1099 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 1100 | |
861580a9 | 1101 | return smp_random(smp); |
88ba43b6 AB |
1102 | } |
1103 | ||
f81cd823 | 1104 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 1105 | { |
c9839a11 | 1106 | struct smp_ltk *key; |
988c5997 VCG |
1107 | struct hci_conn *hcon = conn->hcon; |
1108 | ||
98a0b845 | 1109 | key = hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, |
e804d25d | 1110 | hcon->role); |
988c5997 | 1111 | if (!key) |
f81cd823 | 1112 | return false; |
988c5997 | 1113 | |
a6f7833c | 1114 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 1115 | return false; |
4dab7864 | 1116 | |
51a8efd7 | 1117 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 1118 | return true; |
988c5997 | 1119 | |
c9839a11 VCG |
1120 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
1121 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 1122 | |
fe59a05f JH |
1123 | /* We never store STKs for master role, so clear this flag */ |
1124 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
1125 | ||
f81cd823 | 1126 | return true; |
988c5997 | 1127 | } |
f1560463 | 1128 | |
854f4727 JH |
1129 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level) |
1130 | { | |
1131 | if (sec_level == BT_SECURITY_LOW) | |
1132 | return true; | |
1133 | ||
9ab65d60 JH |
1134 | /* If we're encrypted with an STK always claim insufficient |
1135 | * security. This way we allow the connection to be re-encrypted | |
1136 | * with an LTK, even if the LTK provides the same level of | |
b2d5e254 JH |
1137 | * security. Only exception is if we don't have an LTK (e.g. |
1138 | * because of key distribution bits). | |
9ab65d60 | 1139 | */ |
b2d5e254 JH |
1140 | if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && |
1141 | hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, | |
e804d25d | 1142 | hcon->role)) |
9ab65d60 JH |
1143 | return false; |
1144 | ||
854f4727 JH |
1145 | if (hcon->sec_level >= sec_level) |
1146 | return true; | |
1147 | ||
1148 | return false; | |
1149 | } | |
1150 | ||
da85e5e5 | 1151 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
1152 | { |
1153 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
1154 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 1155 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 1156 | struct smp_chan *smp; |
c05b9339 | 1157 | u8 sec_level, auth; |
88ba43b6 AB |
1158 | |
1159 | BT_DBG("conn %p", conn); | |
1160 | ||
c46b98be | 1161 | if (skb->len < sizeof(*rp)) |
38e4a915 | 1162 | return SMP_INVALID_PARAMS; |
c46b98be | 1163 | |
40bef302 | 1164 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
1165 | return SMP_CMD_NOTSUPP; |
1166 | ||
c05b9339 JH |
1167 | auth = rp->auth_req & AUTH_REQ_MASK; |
1168 | ||
5be5e275 | 1169 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1170 | sec_level = BT_SECURITY_MEDIUM; |
1171 | else | |
1172 | sec_level = authreq_to_seclevel(auth); | |
1173 | ||
854f4727 JH |
1174 | if (smp_sufficient_security(hcon, sec_level)) |
1175 | return 0; | |
1176 | ||
c7262e71 JH |
1177 | if (sec_level > hcon->pending_sec_level) |
1178 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 1179 | |
4dab7864 | 1180 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
1181 | return 0; |
1182 | ||
8aab4757 | 1183 | smp = smp_chan_create(conn); |
c29d2444 JH |
1184 | if (!smp) |
1185 | return SMP_UNSPECIFIED; | |
d26a2345 | 1186 | |
b6ae8457 | 1187 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
c05b9339 | 1188 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
1189 | return SMP_PAIRING_NOTSUPP; |
1190 | ||
88ba43b6 | 1191 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 1192 | |
da85e5e5 | 1193 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 1194 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 1195 | |
1c1def09 VCG |
1196 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1197 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1198 | |
88ba43b6 | 1199 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 1200 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 1201 | |
da85e5e5 | 1202 | return 0; |
88ba43b6 AB |
1203 | } |
1204 | ||
cc110922 | 1205 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 1206 | { |
cc110922 | 1207 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 1208 | struct l2cap_chan *chan; |
0a66cf20 | 1209 | struct smp_chan *smp; |
2b64d153 | 1210 | __u8 authreq; |
fc75cc86 | 1211 | int ret; |
eb492e01 | 1212 | |
3a0259bb VCG |
1213 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
1214 | ||
0a66cf20 JH |
1215 | /* This may be NULL if there's an unexpected disconnection */ |
1216 | if (!conn) | |
1217 | return 1; | |
1218 | ||
c68b7f12 JH |
1219 | chan = conn->smp; |
1220 | ||
757aee0f | 1221 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
1222 | return 1; |
1223 | ||
ad32a2f5 | 1224 | if (smp_sufficient_security(hcon, sec_level)) |
eb492e01 | 1225 | return 1; |
f1cb9af5 | 1226 | |
c7262e71 JH |
1227 | if (sec_level > hcon->pending_sec_level) |
1228 | hcon->pending_sec_level = sec_level; | |
1229 | ||
40bef302 | 1230 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
1231 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
1232 | return 0; | |
d26a2345 | 1233 | |
fc75cc86 JH |
1234 | l2cap_chan_lock(chan); |
1235 | ||
1236 | /* If SMP is already in progress ignore this request */ | |
1237 | if (chan->data) { | |
1238 | ret = 0; | |
1239 | goto unlock; | |
1240 | } | |
d26a2345 | 1241 | |
8aab4757 | 1242 | smp = smp_chan_create(conn); |
fc75cc86 JH |
1243 | if (!smp) { |
1244 | ret = 1; | |
1245 | goto unlock; | |
1246 | } | |
2b64d153 BG |
1247 | |
1248 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 1249 | |
79897d20 JH |
1250 | /* Require MITM if IO Capability allows or the security level |
1251 | * requires it. | |
2e233644 | 1252 | */ |
79897d20 | 1253 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 1254 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
1255 | authreq |= SMP_AUTH_MITM; |
1256 | ||
40bef302 | 1257 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 1258 | struct smp_cmd_pairing cp; |
f01ead31 | 1259 | |
2b64d153 | 1260 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
1261 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1262 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 1263 | |
eb492e01 | 1264 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 1265 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
1266 | } else { |
1267 | struct smp_cmd_security_req cp; | |
2b64d153 | 1268 | cp.auth_req = authreq; |
eb492e01 | 1269 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 1270 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
1271 | } |
1272 | ||
4a74d658 | 1273 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 1274 | ret = 0; |
edca792c | 1275 | |
fc75cc86 JH |
1276 | unlock: |
1277 | l2cap_chan_unlock(chan); | |
1278 | return ret; | |
eb492e01 AB |
1279 | } |
1280 | ||
7034b911 VCG |
1281 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1282 | { | |
16b90839 | 1283 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
1284 | struct l2cap_chan *chan = conn->smp; |
1285 | struct smp_chan *smp = chan->data; | |
16b90839 | 1286 | |
c46b98be JH |
1287 | BT_DBG("conn %p", conn); |
1288 | ||
1289 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1290 | return SMP_INVALID_PARAMS; |
c46b98be | 1291 | |
b28b4943 | 1292 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 1293 | |
16b90839 VCG |
1294 | skb_pull(skb, sizeof(*rp)); |
1295 | ||
1c1def09 | 1296 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1297 | |
7034b911 VCG |
1298 | return 0; |
1299 | } | |
1300 | ||
1301 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1302 | { | |
16b90839 | 1303 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
1304 | struct l2cap_chan *chan = conn->smp; |
1305 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
1306 | struct hci_dev *hdev = conn->hcon->hdev; |
1307 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1308 | struct smp_ltk *ltk; |
c9839a11 | 1309 | u8 authenticated; |
16b90839 | 1310 | |
c46b98be JH |
1311 | BT_DBG("conn %p", conn); |
1312 | ||
1313 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1314 | return SMP_INVALID_PARAMS; |
c46b98be | 1315 | |
9747a9f3 JH |
1316 | /* Mark the information as received */ |
1317 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1318 | ||
b28b4943 JH |
1319 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
1320 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
1321 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
1322 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 1323 | |
16b90839 | 1324 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1325 | |
c9839a11 | 1326 | hci_dev_lock(hdev); |
ce39fb4e | 1327 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1328 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1329 | authenticated, smp->tk, smp->enc_key_size, |
1330 | rp->ediv, rp->rand); | |
1331 | smp->ltk = ltk; | |
c6e81e9a | 1332 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 1333 | smp_distribute_keys(smp); |
c9839a11 | 1334 | hci_dev_unlock(hdev); |
7034b911 VCG |
1335 | |
1336 | return 0; | |
1337 | } | |
1338 | ||
fd349c02 JH |
1339 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1340 | { | |
1341 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
1342 | struct l2cap_chan *chan = conn->smp; |
1343 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1344 | |
1345 | BT_DBG(""); | |
1346 | ||
1347 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1348 | return SMP_INVALID_PARAMS; |
fd349c02 | 1349 | |
b28b4943 | 1350 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 1351 | |
fd349c02 JH |
1352 | skb_pull(skb, sizeof(*info)); |
1353 | ||
1354 | memcpy(smp->irk, info->irk, 16); | |
1355 | ||
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1360 | struct sk_buff *skb) | |
1361 | { | |
1362 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
1363 | struct l2cap_chan *chan = conn->smp; |
1364 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
1365 | struct hci_conn *hcon = conn->hcon; |
1366 | bdaddr_t rpa; | |
1367 | ||
1368 | BT_DBG(""); | |
1369 | ||
1370 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1371 | return SMP_INVALID_PARAMS; |
fd349c02 | 1372 | |
9747a9f3 JH |
1373 | /* Mark the information as received */ |
1374 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1375 | ||
b28b4943 JH |
1376 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
1377 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1378 | ||
fd349c02 JH |
1379 | skb_pull(skb, sizeof(*info)); |
1380 | ||
31dd624e JH |
1381 | hci_dev_lock(hcon->hdev); |
1382 | ||
a9a58f86 JH |
1383 | /* Strictly speaking the Core Specification (4.1) allows sending |
1384 | * an empty address which would force us to rely on just the IRK | |
1385 | * as "identity information". However, since such | |
1386 | * implementations are not known of and in order to not over | |
1387 | * complicate our implementation, simply pretend that we never | |
1388 | * received an IRK for such a device. | |
1389 | */ | |
1390 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1391 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1392 | goto distribute; |
a9a58f86 JH |
1393 | } |
1394 | ||
fd349c02 JH |
1395 | bacpy(&smp->id_addr, &info->bdaddr); |
1396 | smp->id_addr_type = info->addr_type; | |
1397 | ||
1398 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1399 | bacpy(&rpa, &hcon->dst); | |
1400 | else | |
1401 | bacpy(&rpa, BDADDR_ANY); | |
1402 | ||
23d0e128 JH |
1403 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1404 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1405 | |
31dd624e | 1406 | distribute: |
c6e81e9a JH |
1407 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
1408 | smp_distribute_keys(smp); | |
fd349c02 | 1409 | |
31dd624e JH |
1410 | hci_dev_unlock(hcon->hdev); |
1411 | ||
fd349c02 JH |
1412 | return 0; |
1413 | } | |
1414 | ||
7ee4ea36 MH |
1415 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1416 | { | |
1417 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
1418 | struct l2cap_chan *chan = conn->smp; |
1419 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
1420 | struct hci_dev *hdev = conn->hcon->hdev; |
1421 | struct smp_csrk *csrk; | |
1422 | ||
1423 | BT_DBG("conn %p", conn); | |
1424 | ||
1425 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1426 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 1427 | |
7ee4ea36 MH |
1428 | /* Mark the information as received */ |
1429 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1430 | ||
1431 | skb_pull(skb, sizeof(*rp)); | |
1432 | ||
1433 | hci_dev_lock(hdev); | |
1434 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1435 | if (csrk) { | |
1436 | csrk->master = 0x01; | |
1437 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1438 | } | |
1439 | smp->csrk = csrk; | |
d6268e86 | 1440 | smp_distribute_keys(smp); |
7ee4ea36 MH |
1441 | hci_dev_unlock(hdev); |
1442 | ||
1443 | return 0; | |
1444 | } | |
1445 | ||
4befb867 | 1446 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 1447 | { |
5d88cc73 | 1448 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 1449 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 1450 | struct smp_chan *smp; |
92381f5c | 1451 | __u8 code, reason; |
eb492e01 AB |
1452 | int err = 0; |
1453 | ||
7b9899db MH |
1454 | if (hcon->type != LE_LINK) { |
1455 | kfree_skb(skb); | |
3432711f | 1456 | return 0; |
7b9899db MH |
1457 | } |
1458 | ||
8ae9b984 | 1459 | if (skb->len < 1) |
92381f5c | 1460 | return -EILSEQ; |
92381f5c | 1461 | |
06ae3314 | 1462 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1463 | reason = SMP_PAIRING_NOTSUPP; |
1464 | goto done; | |
1465 | } | |
1466 | ||
92381f5c | 1467 | code = skb->data[0]; |
eb492e01 AB |
1468 | skb_pull(skb, sizeof(code)); |
1469 | ||
b28b4943 JH |
1470 | smp = chan->data; |
1471 | ||
1472 | if (code > SMP_CMD_MAX) | |
1473 | goto drop; | |
1474 | ||
24bd0bd9 | 1475 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
1476 | goto drop; |
1477 | ||
1478 | /* If we don't have a context the only allowed commands are | |
1479 | * pairing request and security request. | |
8cf9fa12 | 1480 | */ |
b28b4943 JH |
1481 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
1482 | goto drop; | |
8cf9fa12 | 1483 | |
eb492e01 AB |
1484 | switch (code) { |
1485 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1486 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1487 | break; |
1488 | ||
1489 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1490 | smp_failure(conn, 0); |
da85e5e5 | 1491 | err = -EPERM; |
eb492e01 AB |
1492 | break; |
1493 | ||
1494 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1495 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1496 | break; |
1497 | ||
1498 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1499 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1500 | break; |
1501 | ||
eb492e01 | 1502 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1503 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1504 | break; |
1505 | ||
eb492e01 | 1506 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1507 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1508 | break; |
1509 | ||
eb492e01 | 1510 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1511 | reason = smp_cmd_encrypt_info(conn, skb); |
1512 | break; | |
1513 | ||
eb492e01 | 1514 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1515 | reason = smp_cmd_master_ident(conn, skb); |
1516 | break; | |
1517 | ||
eb492e01 | 1518 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1519 | reason = smp_cmd_ident_info(conn, skb); |
1520 | break; | |
1521 | ||
eb492e01 | 1522 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1523 | reason = smp_cmd_ident_addr_info(conn, skb); |
1524 | break; | |
1525 | ||
eb492e01 | 1526 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1527 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1528 | break; |
1529 | ||
eb492e01 AB |
1530 | default: |
1531 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 1532 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 1533 | goto done; |
eb492e01 AB |
1534 | } |
1535 | ||
3a0259bb | 1536 | done: |
9b7b18ef JH |
1537 | if (!err) { |
1538 | if (reason) | |
1539 | smp_failure(conn, reason); | |
8ae9b984 | 1540 | kfree_skb(skb); |
9b7b18ef JH |
1541 | } |
1542 | ||
eb492e01 | 1543 | return err; |
b28b4943 JH |
1544 | |
1545 | drop: | |
1546 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
1547 | code, &hcon->dst); | |
1548 | kfree_skb(skb); | |
1549 | return 0; | |
eb492e01 | 1550 | } |
7034b911 | 1551 | |
70db83c4 JH |
1552 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
1553 | { | |
1554 | struct l2cap_conn *conn = chan->conn; | |
1555 | ||
1556 | BT_DBG("chan %p", chan); | |
1557 | ||
fc75cc86 | 1558 | if (chan->data) |
5d88cc73 | 1559 | smp_chan_destroy(conn); |
5d88cc73 | 1560 | |
70db83c4 JH |
1561 | conn->smp = NULL; |
1562 | l2cap_chan_put(chan); | |
1563 | } | |
1564 | ||
44f1a7ab JH |
1565 | static void smp_resume_cb(struct l2cap_chan *chan) |
1566 | { | |
b68fda68 | 1567 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
1568 | struct l2cap_conn *conn = chan->conn; |
1569 | struct hci_conn *hcon = conn->hcon; | |
1570 | ||
1571 | BT_DBG("chan %p", chan); | |
1572 | ||
86d1407c JH |
1573 | if (!smp) |
1574 | return; | |
b68fda68 | 1575 | |
84bc0db5 JH |
1576 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
1577 | return; | |
1578 | ||
86d1407c JH |
1579 | cancel_delayed_work(&smp->security_timer); |
1580 | ||
d6268e86 | 1581 | smp_distribute_keys(smp); |
44f1a7ab JH |
1582 | } |
1583 | ||
70db83c4 JH |
1584 | static void smp_ready_cb(struct l2cap_chan *chan) |
1585 | { | |
1586 | struct l2cap_conn *conn = chan->conn; | |
1587 | ||
1588 | BT_DBG("chan %p", chan); | |
1589 | ||
1590 | conn->smp = chan; | |
1591 | l2cap_chan_hold(chan); | |
1592 | } | |
1593 | ||
4befb867 JH |
1594 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
1595 | { | |
1596 | int err; | |
1597 | ||
1598 | BT_DBG("chan %p", chan); | |
1599 | ||
1600 | err = smp_sig_channel(chan, skb); | |
1601 | if (err) { | |
b68fda68 | 1602 | struct smp_chan *smp = chan->data; |
4befb867 | 1603 | |
b68fda68 JH |
1604 | if (smp) |
1605 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 1606 | |
1e91c29e | 1607 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
1608 | } |
1609 | ||
1610 | return err; | |
1611 | } | |
1612 | ||
70db83c4 JH |
1613 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
1614 | unsigned long hdr_len, | |
1615 | unsigned long len, int nb) | |
1616 | { | |
1617 | struct sk_buff *skb; | |
1618 | ||
1619 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
1620 | if (!skb) | |
1621 | return ERR_PTR(-ENOMEM); | |
1622 | ||
1623 | skb->priority = HCI_PRIO_MAX; | |
1624 | bt_cb(skb)->chan = chan; | |
1625 | ||
1626 | return skb; | |
1627 | } | |
1628 | ||
1629 | static const struct l2cap_ops smp_chan_ops = { | |
1630 | .name = "Security Manager", | |
1631 | .ready = smp_ready_cb, | |
5d88cc73 | 1632 | .recv = smp_recv_cb, |
70db83c4 JH |
1633 | .alloc_skb = smp_alloc_skb_cb, |
1634 | .teardown = smp_teardown_cb, | |
44f1a7ab | 1635 | .resume = smp_resume_cb, |
70db83c4 JH |
1636 | |
1637 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
1638 | .state_change = l2cap_chan_no_state_change, |
1639 | .close = l2cap_chan_no_close, | |
1640 | .defer = l2cap_chan_no_defer, | |
1641 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
1642 | .set_shutdown = l2cap_chan_no_set_shutdown, |
1643 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1644 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1645 | }; | |
1646 | ||
1647 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
1648 | { | |
1649 | struct l2cap_chan *chan; | |
1650 | ||
1651 | BT_DBG("pchan %p", pchan); | |
1652 | ||
1653 | chan = l2cap_chan_create(); | |
1654 | if (!chan) | |
1655 | return NULL; | |
1656 | ||
1657 | chan->chan_type = pchan->chan_type; | |
1658 | chan->ops = &smp_chan_ops; | |
1659 | chan->scid = pchan->scid; | |
1660 | chan->dcid = chan->scid; | |
1661 | chan->imtu = pchan->imtu; | |
1662 | chan->omtu = pchan->omtu; | |
1663 | chan->mode = pchan->mode; | |
1664 | ||
1665 | BT_DBG("created chan %p", chan); | |
1666 | ||
1667 | return chan; | |
1668 | } | |
1669 | ||
1670 | static const struct l2cap_ops smp_root_chan_ops = { | |
1671 | .name = "Security Manager Root", | |
1672 | .new_connection = smp_new_conn_cb, | |
1673 | ||
1674 | /* None of these are implemented for the root channel */ | |
1675 | .close = l2cap_chan_no_close, | |
1676 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
1677 | .recv = l2cap_chan_no_recv, | |
1678 | .state_change = l2cap_chan_no_state_change, | |
1679 | .teardown = l2cap_chan_no_teardown, | |
1680 | .ready = l2cap_chan_no_ready, | |
1681 | .defer = l2cap_chan_no_defer, | |
1682 | .suspend = l2cap_chan_no_suspend, | |
1683 | .resume = l2cap_chan_no_resume, | |
1684 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
1685 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
1686 | .memcpy_fromiovec = l2cap_chan_no_memcpy_fromiovec, | |
1687 | }; | |
1688 | ||
711eafe3 JH |
1689 | int smp_register(struct hci_dev *hdev) |
1690 | { | |
70db83c4 | 1691 | struct l2cap_chan *chan; |
defce9e8 | 1692 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 1693 | |
711eafe3 JH |
1694 | BT_DBG("%s", hdev->name); |
1695 | ||
defce9e8 JH |
1696 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
1697 | if (IS_ERR(tfm_aes)) { | |
1698 | int err = PTR_ERR(tfm_aes); | |
711eafe3 | 1699 | BT_ERR("Unable to create crypto context"); |
711eafe3 JH |
1700 | return err; |
1701 | } | |
1702 | ||
70db83c4 JH |
1703 | chan = l2cap_chan_create(); |
1704 | if (!chan) { | |
defce9e8 | 1705 | crypto_free_blkcipher(tfm_aes); |
70db83c4 JH |
1706 | return -ENOMEM; |
1707 | } | |
1708 | ||
defce9e8 JH |
1709 | chan->data = tfm_aes; |
1710 | ||
5d88cc73 | 1711 | l2cap_add_scid(chan, L2CAP_CID_SMP); |
70db83c4 JH |
1712 | |
1713 | l2cap_chan_set_defaults(chan); | |
1714 | ||
1715 | bacpy(&chan->src, &hdev->bdaddr); | |
1716 | chan->src_type = BDADDR_LE_PUBLIC; | |
1717 | chan->state = BT_LISTEN; | |
1718 | chan->mode = L2CAP_MODE_BASIC; | |
1719 | chan->imtu = L2CAP_DEFAULT_MTU; | |
1720 | chan->ops = &smp_root_chan_ops; | |
1721 | ||
1722 | hdev->smp_data = chan; | |
1723 | ||
711eafe3 JH |
1724 | return 0; |
1725 | } | |
1726 | ||
1727 | void smp_unregister(struct hci_dev *hdev) | |
1728 | { | |
70db83c4 | 1729 | struct l2cap_chan *chan = hdev->smp_data; |
defce9e8 | 1730 | struct crypto_blkcipher *tfm_aes; |
70db83c4 JH |
1731 | |
1732 | if (!chan) | |
1733 | return; | |
1734 | ||
1735 | BT_DBG("%s chan %p", hdev->name, chan); | |
711eafe3 | 1736 | |
defce9e8 JH |
1737 | tfm_aes = chan->data; |
1738 | if (tfm_aes) { | |
1739 | chan->data = NULL; | |
1740 | crypto_free_blkcipher(tfm_aes); | |
711eafe3 | 1741 | } |
70db83c4 JH |
1742 | |
1743 | hdev->smp_data = NULL; | |
1744 | l2cap_chan_put(chan); | |
711eafe3 | 1745 | } |