projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Bluetooth: Don't send public key if OOB data verification fails
[deliverable/linux.git] / net / bluetooth / smp.c
CommitLineData
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
300acfde 23#include <linux/debugfs.h>
8c520a59
GP		 24#include <linux/crypto.h>
25#include <linux/scatterlist.h>
26#include <crypto/b128ops.h>
27
eb492e01
AB		 28#include <net/bluetooth/bluetooth.h>
29#include <net/bluetooth/hci_core.h>
30#include <net/bluetooth/l2cap.h>
2b64d153 31#include <net/bluetooth/mgmt.h>
ac4b7236 32
3b19146d 33#include "ecc.h"
ac4b7236 34#include "smp.h"
d22ef0bc 35
c7a3d57d
JH		 36/* Low-level debug macros to be used for stuff that we don't want
37 * accidentially in dmesg, i.e. the values of the various crypto keys
38 * and the inputs & outputs of crypto functions.
39 */
40#ifdef DEBUG
41#define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \
42 ##__VA_ARGS__)
43#else
44#define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \
45 ##__VA_ARGS__)
46#endif
47
b28b4943 48#define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd)
b28b4943 49
3b19146d
JH		 50/* Keys which are not distributed with Secure Connections */
51#define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY);
52
17b02e62 53#define SMP_TIMEOUT msecs_to_jiffies(30000)
5d3de7df 54
d7a5a11d 55#define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \
0edb14de
JH		 56 0x1f : 0x07)
57#define KEY_DIST_MASK 0x07
065a13e2 58
cbbbe3e2
JH		 59/* Maximum message length that can be passed to aes_cmac */
60#define CMAC_MSG_MAX 80
61
533e35d4
JH		 62enum {
63 SMP_FLAG_TK_VALID,
64 SMP_FLAG_CFM_PENDING,
65 SMP_FLAG_MITM_AUTH,
66 SMP_FLAG_COMPLETE,
67 SMP_FLAG_INITIATOR,
65668776 68 SMP_FLAG_SC,
d8f8edbe 69 SMP_FLAG_REMOTE_PK,
aeb7d461 70 SMP_FLAG_DEBUG_KEY,
38606f14 71 SMP_FLAG_WAIT_USER,
d3e54a87 72 SMP_FLAG_DHKEY_PENDING,
1a8bab4f
JH		 73 SMP_FLAG_REMOTE_OOB,
74 SMP_FLAG_LOCAL_OOB,
533e35d4 75};
4bc58f51 76
88a479d9 77struct smp_dev {
60a27d65
MH		 78 /* Secure Connections OOB data */
79 u8 local_pk[64];
80 u8 local_sk[32];
81 u8 local_rr[16];
82 bool debug_key;
83
88a479d9 84 struct crypto_blkcipher *tfm_aes;
6e2dc6d1 85 struct crypto_hash *tfm_cmac;
88a479d9
MH		 86};
87
4bc58f51 88struct smp_chan {
b68fda68
JH		 89 struct l2cap_conn *conn;
90 struct delayed_work security_timer;
b28b4943 91 unsigned long allow_cmd; /* Bitmask of allowed commands */
b68fda68 92
4bc58f51
JH		 93 u8 preq[7]; /* SMP Pairing Request */
94 u8 prsp[7]; /* SMP Pairing Response */
95 u8 prnd[16]; /* SMP Pairing Random (local) */
96 u8 rrnd[16]; /* SMP Pairing Random (remote) */
97 u8 pcnf[16]; /* SMP Pairing Confirm */
98 u8 tk[16]; /* SMP Temporary Key */
882fafad
JH		 99 u8 rr[16]; /* Remote OOB ra/rb value */
100 u8 lr[16]; /* Local OOB ra/rb value */
4bc58f51
JH		 101 u8 enc_key_size;
102 u8 remote_key_dist;
103 bdaddr_t id_addr;
104 u8 id_addr_type;
105 u8 irk[16];
106 struct smp_csrk *csrk;
107 struct smp_csrk *slave_csrk;
108 struct smp_ltk *ltk;
109 struct smp_ltk *slave_ltk;
110 struct smp_irk *remote_irk;
6a77083a 111 u8 *link_key;
4a74d658 112 unsigned long flags;
783e0574 113 u8 method;
38606f14 114 u8 passkey_round;
6a7bd103 115
3b19146d
JH		 116 /* Secure Connections variables */
117 u8 local_pk[64];
118 u8 local_sk[32];
d8f8edbe
JH		 119 u8 remote_pk[64];
120 u8 dhkey[32];
760b018b 121 u8 mackey[16];
3b19146d 122
6a7bd103 123 struct crypto_blkcipher *tfm_aes;
407cecf6 124 struct crypto_hash *tfm_cmac;
4bc58f51
JH		 125};
126
aeb7d461
JH		 127/* These debug key values are defined in the SMP section of the core
128 * specification. debug_pk is the public debug key and debug_sk the
129 * private debug key.
130 */
131static const u8 debug_pk[64] = {
132 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
133 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
134 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
135 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20,
136
137 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74,
138 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76,
139 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63,
140 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc,
141};
142
143static const u8 debug_sk[32] = {
144 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58,
145 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a,
146 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74,
147 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f,
148};
149
8a2936f4 150static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
d22ef0bc 151{
8a2936f4 152 size_t i;
d22ef0bc 153
8a2936f4
JH		 154 for (i = 0; i < len; i++)
155 dst[len - 1 - i] = src[i];
d22ef0bc
AB		 156}
157
06edf8de
JH		 158/* The following functions map to the LE SC SMP crypto functions
159 * AES-CMAC, f4, f5, f6, g2 and h6.
160 */
161
cbbbe3e2
JH		 162static int aes_cmac(struct crypto_hash *tfm, const u8 k[16], const u8 *m,
163 size_t len, u8 mac[16])
164{
165 uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
166 struct hash_desc desc;
167 struct scatterlist sg;
168 int err;
169
170 if (len > CMAC_MSG_MAX)
171 return -EFBIG;
172
173 if (!tfm) {
174 BT_ERR("tfm %p", tfm);
175 return -EINVAL;
176 }
177
178 desc.tfm = tfm;
179 desc.flags = 0;
180
181 crypto_hash_init(&desc);
182
183 /* Swap key and message from LSB to MSB */
184 swap_buf(k, tmp, 16);
185 swap_buf(m, msg_msb, len);
186
c7a3d57d
JH		 187 SMP_DBG("msg (len %zu) %*phN", len, (int) len, m);
188 SMP_DBG("key %16phN", k);
cbbbe3e2
JH		 189
190 err = crypto_hash_setkey(tfm, tmp, 16);
191 if (err) {
192 BT_ERR("cipher setkey failed: %d", err);
193 return err;
194 }
195
196 sg_init_one(&sg, msg_msb, len);
197
198 err = crypto_hash_update(&desc, &sg, len);
199 if (err) {
200 BT_ERR("Hash update error %d", err);
201 return err;
202 }
203
204 err = crypto_hash_final(&desc, mac_msb);
205 if (err) {
206 BT_ERR("Hash final error %d", err);
207 return err;
208 }
209
210 swap_buf(mac_msb, mac, 16);
211
c7a3d57d 212 SMP_DBG("mac %16phN", mac);
cbbbe3e2
JH		 213
214 return 0;
215}
216
217static int smp_f4(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32],
218 const u8 x[16], u8 z, u8 res[16])
219{
220 u8 m[65];
221 int err;
222
c7a3d57d
JH		 223 SMP_DBG("u %32phN", u);
224 SMP_DBG("v %32phN", v);
225 SMP_DBG("x %16phN z %02x", x, z);
cbbbe3e2
JH		 226
227 m[0] = z;
228 memcpy(m + 1, v, 32);
229 memcpy(m + 33, u, 32);
230
231 err = aes_cmac(tfm_cmac, x, m, sizeof(m), res);
232 if (err)
233 return err;
234
c7a3d57d 235 SMP_DBG("res %16phN", res);
cbbbe3e2
JH		 236
237 return err;
238}
239
4da50de8
JH		 240static int smp_f5(struct crypto_hash *tfm_cmac, const u8 w[32],
241 const u8 n1[16], const u8 n2[16], const u8 a1[7],
242 const u8 a2[7], u8 mackey[16], u8 ltk[16])
760b018b
JH		 243{
244 /* The btle, salt and length "magic" values are as defined in
245 * the SMP section of the Bluetooth core specification. In ASCII
246 * the btle value ends up being 'btle'. The salt is just a
247 * random number whereas length is the value 256 in little
248 * endian format.
249 */
250 const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 };
251 const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60,
252 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c };
253 const u8 length[2] = { 0x00, 0x01 };
254 u8 m[53], t[16];
255 int err;
256
c7a3d57d
JH		 257 SMP_DBG("w %32phN", w);
258 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
259 SMP_DBG("a1 %7phN a2 %7phN", a1, a2);
760b018b
JH		 260
261 err = aes_cmac(tfm_cmac, salt, w, 32, t);
262 if (err)
263 return err;
264
c7a3d57d 265 SMP_DBG("t %16phN", t);
760b018b
JH		 266
267 memcpy(m, length, 2);
268 memcpy(m + 2, a2, 7);
269 memcpy(m + 9, a1, 7);
270 memcpy(m + 16, n2, 16);
271 memcpy(m + 32, n1, 16);
272 memcpy(m + 48, btle, 4);
273
274 m[52] = 0; /* Counter */
275
276 err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey);
277 if (err)
278 return err;
279
c7a3d57d 280 SMP_DBG("mackey %16phN", mackey);
760b018b
JH		 281
282 m[52] = 1; /* Counter */
283
284 err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk);
285 if (err)
286 return err;
287
c7a3d57d 288 SMP_DBG("ltk %16phN", ltk);
760b018b
JH		 289
290 return 0;
291}
292
293static int smp_f6(struct crypto_hash *tfm_cmac, const u8 w[16],
4da50de8 294 const u8 n1[16], const u8 n2[16], const u8 r[16],
760b018b
JH		 295 const u8 io_cap[3], const u8 a1[7], const u8 a2[7],
296 u8 res[16])
297{
298 u8 m[65];
299 int err;
300
c7a3d57d
JH		 301 SMP_DBG("w %16phN", w);
302 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
303 SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2);
760b018b
JH		 304
305 memcpy(m, a2, 7);
306 memcpy(m + 7, a1, 7);
307 memcpy(m + 14, io_cap, 3);
308 memcpy(m + 17, r, 16);
309 memcpy(m + 33, n2, 16);
310 memcpy(m + 49, n1, 16);
311
312 err = aes_cmac(tfm_cmac, w, m, sizeof(m), res);
313 if (err)
314 return err;
315
203de21b 316 SMP_DBG("res %16phN", res);
760b018b
JH		 317
318 return err;
319}
320
191dc7fe
JH		 321static int smp_g2(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32],
322 const u8 x[16], const u8 y[16], u32 *val)
323{
324 u8 m[80], tmp[16];
325 int err;
326
c7a3d57d
JH		 327 SMP_DBG("u %32phN", u);
328 SMP_DBG("v %32phN", v);
329 SMP_DBG("x %16phN y %16phN", x, y);
191dc7fe
JH		 330
331 memcpy(m, y, 16);
332 memcpy(m + 16, v, 32);
333 memcpy(m + 48, u, 32);
334
335 err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
336 if (err)
337 return err;
338
339 *val = get_unaligned_le32(tmp);
340 *val %= 1000000;
341
c7a3d57d 342 SMP_DBG("val %06u", *val);
191dc7fe
JH		 343
344 return 0;
345}
346
06edf8de
JH		 347static int smp_h6(struct crypto_hash *tfm_cmac, const u8 w[16],
348 const u8 key_id[4], u8 res[16])
349{
350 int err;
351
352 SMP_DBG("w %16phN key_id %4phN", w, key_id);
353
354 err = aes_cmac(tfm_cmac, w, key_id, 4, res);
355 if (err)
356 return err;
357
358 SMP_DBG("res %16phN", res);
359
360 return err;
361}
362
363/* The following functions map to the legacy SMP crypto functions e, c1,
364 * s1 and ah.
365 */
366
d22ef0bc
AB		 367static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
368{
369 struct blkcipher_desc desc;
370 struct scatterlist sg;
943a732a 371 uint8_t tmp[16], data[16];
201a5929 372 int err;
d22ef0bc 373
7f376cd6 374 if (!tfm) {
d22ef0bc
AB		 375 BT_ERR("tfm %p", tfm);
376 return -EINVAL;
377 }
378
379 desc.tfm = tfm;
380 desc.flags = 0;
381
943a732a 382 /* The most significant octet of key corresponds to k[0] */
8a2936f4 383 swap_buf(k, tmp, 16);
943a732a
JH		 384
385 err = crypto_blkcipher_setkey(tfm, tmp, 16);
d22ef0bc
AB		 386 if (err) {
387 BT_ERR("cipher setkey failed: %d", err);
388 return err;
389 }
390
943a732a 391 /* Most significant octet of plaintextData corresponds to data[0] */
8a2936f4 392 swap_buf(r, data, 16);
943a732a
JH		 393
394 sg_init_one(&sg, data, 16);
d22ef0bc 395
d22ef0bc
AB		 396 err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16);
397 if (err)
398 BT_ERR("Encrypt data error %d", err);
399
943a732a 400 /* Most significant octet of encryptedData corresponds to data[0] */
8a2936f4 401 swap_buf(data, r, 16);
943a732a 402
d22ef0bc
AB		 403 return err;
404}
405
06edf8de
JH		 406static int smp_c1(struct crypto_blkcipher *tfm_aes, const u8 k[16],
407 const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
408 const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
6a77083a 409{
06edf8de 410 u8 p1[16], p2[16];
6a77083a
JH		 411 int err;
412
06edf8de 413 memset(p1, 0, 16);
6a77083a 414
06edf8de
JH		 415 /* p1 = pres || preq || _rat || _iat */
416 p1[0] = _iat;
417 p1[1] = _rat;
418 memcpy(p1 + 2, preq, 7);
419 memcpy(p1 + 9, pres, 7);
420
421 /* p2 = padding || ia || ra */
422 memcpy(p2, ra, 6);
423 memcpy(p2 + 6, ia, 6);
424 memset(p2 + 12, 0, 4);
425
426 /* res = r XOR p1 */
427 u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
428
429 /* res = e(k, res) */
430 err = smp_e(tfm_aes, k, res);
431 if (err) {
432 BT_ERR("Encrypt data error");
6a77083a 433 return err;
06edf8de 434 }
6a77083a 435
06edf8de
JH		 436 /* res = res XOR p2 */
437 u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
438
439 /* res = e(k, res) */
440 err = smp_e(tfm_aes, k, res);
441 if (err)
442 BT_ERR("Encrypt data error");
443
444 return err;
445}
446
447static int smp_s1(struct crypto_blkcipher *tfm_aes, const u8 k[16],
448 const u8 r1[16], const u8 r2[16], u8 _r[16])
449{
450 int err;
451
452 /* Just least significant octets from r1 and r2 are considered */
453 memcpy(_r, r2, 8);
454 memcpy(_r + 8, r1, 8);
455
456 err = smp_e(tfm_aes, k, _r);
457 if (err)
458 BT_ERR("Encrypt data error");
6a77083a
JH		 459
460 return err;
461}
462
cd082797
JH		 463static int smp_ah(struct crypto_blkcipher *tfm, const u8 irk[16],
464 const u8 r[3], u8 res[3])
60478054 465{
943a732a 466 u8 _res[16];
60478054
JH		 467 int err;
468
469 /* r' = padding || r */
943a732a
JH		 470 memcpy(_res, r, 3);
471 memset(_res + 3, 0, 13);
60478054 472
943a732a 473 err = smp_e(tfm, irk, _res);
60478054
JH		 474 if (err) {
475 BT_ERR("Encrypt error");
476 return err;
477 }
478
479 /* The output of the random address function ah is:
480 * ah(h, r) = e(k, r') mod 2^24
481 * The output of the security function e is then truncated to 24 bits
482 * by taking the least significant 24 bits of the output of e as the
483 * result of ah.
484 */
943a732a 485 memcpy(res, _res, 3);
60478054
JH		 486
487 return 0;
488}
489
cd082797
JH		 490bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
491 const bdaddr_t *bdaddr)
60478054 492{
defce9e8 493 struct l2cap_chan *chan = hdev->smp_data;
88a479d9 494 struct smp_dev *smp;
60478054
JH		 495 u8 hash[3];
496 int err;
497
defce9e8
JH		 498 if (!chan || !chan->data)
499 return false;
500
88a479d9 501 smp = chan->data;
defce9e8 502
60478054
JH		 503 BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk);
504
88a479d9 505 err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash);
60478054
JH		 506 if (err)
507 return false;
508
509 return !memcmp(bdaddr->b, hash, 3);
510}
511
cd082797 512int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
b1e2b3ae 513{
defce9e8 514 struct l2cap_chan *chan = hdev->smp_data;
88a479d9 515 struct smp_dev *smp;
b1e2b3ae
JH		 516 int err;
517
defce9e8
JH		 518 if (!chan || !chan->data)
519 return -EOPNOTSUPP;
520
88a479d9 521 smp = chan->data;
defce9e8 522
b1e2b3ae
JH		 523 get_random_bytes(&rpa->b[3], 3);
524
525 rpa->b[5] &= 0x3f; /* Clear two most significant bits */
526 rpa->b[5] |= 0x40; /* Set second most significant bit */
527
88a479d9 528 err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b);
b1e2b3ae
JH		 529 if (err < 0)
530 return err;
531
532 BT_DBG("RPA %pMR", rpa);
533
534 return 0;
535}
536
60a27d65
MH		 537int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
538{
539 struct l2cap_chan *chan = hdev->smp_data;
540 struct smp_dev *smp;
541 int err;
542
543 if (!chan || !chan->data)
544 return -EOPNOTSUPP;
545
546 smp = chan->data;
547
548 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
549 BT_DBG("Using debug keys");
550 memcpy(smp->local_pk, debug_pk, 64);
551 memcpy(smp->local_sk, debug_sk, 32);
552 smp->debug_key = true;
553 } else {
554 while (true) {
555 /* Generate local key pair for Secure Connections */
556 if (!ecc_make_key(smp->local_pk, smp->local_sk))
557 return -EIO;
558
559 /* This is unlikely, but we need to check that
560 * we didn't accidentially generate a debug key.
561 */
562 if (memcmp(smp->local_sk, debug_sk, 32))
563 break;
564 }
565 smp->debug_key = false;
566 }
567
568 SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
569 SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
570 SMP_DBG("OOB Private Key: %32phN", smp->local_sk);
571
572 get_random_bytes(smp->local_rr, 16);
573
574 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
575 smp->local_rr, 0, hash);
576 if (err < 0)
577 return err;
578
579 memcpy(rand, smp->local_rr, 16);
580
581 return 0;
582}
583
5d88cc73 584static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
eb492e01 585{
5d88cc73 586 struct l2cap_chan *chan = conn->smp;
b68fda68 587 struct smp_chan *smp;
5d88cc73
JH		 588 struct kvec iv[2];
589 struct msghdr msg;
eb492e01 590
5d88cc73
JH		 591 if (!chan)
592 return;
eb492e01 593
5d88cc73 594 BT_DBG("code 0x%2.2x", code);
eb492e01 595
5d88cc73
JH		 596 iv[0].iov_base = &code;
597 iv[0].iov_len = 1;
eb492e01 598
5d88cc73
JH		 599 iv[1].iov_base = data;
600 iv[1].iov_len = len;
eb492e01 601
5d88cc73 602 memset(&msg, 0, sizeof(msg));
eb492e01 603
17836394 604 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len);
eb492e01 605
5d88cc73 606 l2cap_chan_send(chan, &msg, 1 + len);
e2dcd113 607
b68fda68
JH		 608 if (!chan->data)
609 return;
610
611 smp = chan->data;
612
613 cancel_delayed_work_sync(&smp->security_timer);
1b0921d6 614 schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
eb492e01
AB		 615}
616
d2eb9e10 617static u8 authreq_to_seclevel(u8 authreq)
2b64d153 618{
d2eb9e10
JH		 619 if (authreq & SMP_AUTH_MITM) {
620 if (authreq & SMP_AUTH_SC)
621 return BT_SECURITY_FIPS;
622 else
623 return BT_SECURITY_HIGH;
624 } else {
2b64d153 625 return BT_SECURITY_MEDIUM;
d2eb9e10 626 }
2b64d153
BG		 627}
628
629static __u8 seclevel_to_authreq(__u8 sec_level)
630{
631 switch (sec_level) {
d2eb9e10 632 case BT_SECURITY_FIPS:
2b64d153
BG		 633 case BT_SECURITY_HIGH:
634 return SMP_AUTH_MITM | SMP_AUTH_BONDING;
635 case BT_SECURITY_MEDIUM:
636 return SMP_AUTH_BONDING;
637 default:
638 return SMP_AUTH_NONE;
639 }
640}
641
b8e66eac 642static void build_pairing_cmd(struct l2cap_conn *conn,
f1560463
MH		 643 struct smp_cmd_pairing *req,
644 struct smp_cmd_pairing *rsp, __u8 authreq)
b8e66eac 645{
5d88cc73
JH		 646 struct l2cap_chan *chan = conn->smp;
647 struct smp_chan *smp = chan->data;
fd349c02
JH		 648 struct hci_conn *hcon = conn->hcon;
649 struct hci_dev *hdev = hcon->hdev;
02b05bd8 650 u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT;
54790f73 651
d7a5a11d 652 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
7ee4ea36
MH		 653 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
654 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
54790f73 655 authreq |= SMP_AUTH_BONDING;
2b64d153
BG		 656 } else {
657 authreq &= ~SMP_AUTH_BONDING;
54790f73
VCG		 658 }
659
d7a5a11d 660 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
fd349c02
JH		 661 remote_dist |= SMP_DIST_ID_KEY;
662
d7a5a11d 663 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
863efaf2
JH		 664 local_dist |= SMP_DIST_ID_KEY;
665
d7a5a11d 666 if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&
02b05bd8
JH		 667 (authreq & SMP_AUTH_SC)) {
668 struct oob_data *oob_data;
669 u8 bdaddr_type;
670
d7a5a11d 671 if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
df8e1a4c
JH		 672 local_dist |= SMP_DIST_LINK_KEY;
673 remote_dist |= SMP_DIST_LINK_KEY;
674 }
02b05bd8
JH		 675
676 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
677 bdaddr_type = BDADDR_LE_PUBLIC;
678 else
679 bdaddr_type = BDADDR_LE_RANDOM;
680
681 oob_data = hci_find_remote_oob_data(hdev, &hcon->dst,
682 bdaddr_type);
4775a4ea 683 if (oob_data && oob_data->present) {
1a8bab4f 684 set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags);
02b05bd8 685 oob_flag = SMP_OOB_PRESENT;
a29b0733 686 memcpy(smp->rr, oob_data->rand256, 16);
02b05bd8
JH		 687 memcpy(smp->pcnf, oob_data->hash256, 16);
688 }
689
df8e1a4c
JH		 690 } else {
691 authreq &= ~SMP_AUTH_SC;
692 }
693
54790f73
VCG		 694 if (rsp == NULL) {
695 req->io_capability = conn->hcon->io_capability;
02b05bd8 696 req->oob_flag = oob_flag;
54790f73 697 req->max_key_size = SMP_MAX_ENC_KEY_SIZE;
fd349c02
JH		 698 req->init_key_dist = local_dist;
699 req->resp_key_dist = remote_dist;
0edb14de 700 req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 701
702 smp->remote_key_dist = remote_dist;
54790f73
VCG		 703 return;
704 }
705
706 rsp->io_capability = conn->hcon->io_capability;
02b05bd8 707 rsp->oob_flag = oob_flag;
54790f73 708 rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
fd349c02
JH		 709 rsp->init_key_dist = req->init_key_dist & remote_dist;
710 rsp->resp_key_dist = req->resp_key_dist & local_dist;
0edb14de 711 rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 712
713 smp->remote_key_dist = rsp->init_key_dist;
b8e66eac
VCG		 714}
715
3158c50c
VCG		 716static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
717{
5d88cc73
JH		 718 struct l2cap_chan *chan = conn->smp;
719 struct smp_chan *smp = chan->data;
1c1def09 720
3158c50c 721 if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) ||
f1560463 722 (max_key_size < SMP_MIN_ENC_KEY_SIZE))
3158c50c
VCG		 723 return SMP_ENC_KEY_SIZE;
724
f7aa611a 725 smp->enc_key_size = max_key_size;
3158c50c
VCG		 726
727 return 0;
728}
729
6f48e260
JH		 730static void smp_chan_destroy(struct l2cap_conn *conn)
731{
732 struct l2cap_chan *chan = conn->smp;
733 struct smp_chan *smp = chan->data;
923e2414 734 struct hci_conn *hcon = conn->hcon;
6f48e260
JH		 735 bool complete;
736
737 BUG_ON(!smp);
738
739 cancel_delayed_work_sync(&smp->security_timer);
6f48e260 740
6f48e260 741 complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
923e2414 742 mgmt_smp_complete(hcon, complete);
6f48e260 743
276812ec
MH		 744 kzfree(smp->csrk);
745 kzfree(smp->slave_csrk);
746 kzfree(smp->link_key);
6f48e260
JH		 747
748 crypto_free_blkcipher(smp->tfm_aes);
407cecf6 749 crypto_free_hash(smp->tfm_cmac);
6f48e260 750
923e2414
JH		 751 /* Ensure that we don't leave any debug key around if debug key
752 * support hasn't been explicitly enabled.
753 */
754 if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG &&
d7a5a11d 755 !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) {
923e2414
JH		 756 list_del_rcu(&smp->ltk->list);
757 kfree_rcu(smp->ltk, rcu);
758 smp->ltk = NULL;
759 }
760
6f48e260
JH		 761 /* If pairing failed clean up any keys we might have */
762 if (!complete) {
763 if (smp->ltk) {
970d0f1b
JH		 764 list_del_rcu(&smp->ltk->list);
765 kfree_rcu(smp->ltk, rcu);
6f48e260
JH		 766 }
767
768 if (smp->slave_ltk) {
970d0f1b
JH		 769 list_del_rcu(&smp->slave_ltk->list);
770 kfree_rcu(smp->slave_ltk, rcu);
6f48e260
JH		 771 }
772
773 if (smp->remote_irk) {
adae20cb
JH		 774 list_del_rcu(&smp->remote_irk->list);
775 kfree_rcu(smp->remote_irk, rcu);
6f48e260
JH		 776 }
777 }
778
779 chan->data = NULL;
276812ec 780 kzfree(smp);
923e2414 781 hci_conn_drop(hcon);
6f48e260
JH		 782}
783
84794e11 784static void smp_failure(struct l2cap_conn *conn, u8 reason)
4f957a76 785{
bab73cb6 786 struct hci_conn *hcon = conn->hcon;
b68fda68 787 struct l2cap_chan *chan = conn->smp;
bab73cb6 788
84794e11 789 if (reason)
4f957a76 790 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
f1560463 791 &reason);
4f957a76 792
ce39fb4e 793 clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags);
e1e930f5 794 mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE);
f1c09c07 795
fc75cc86 796 if (chan->data)
f1c09c07 797 smp_chan_destroy(conn);
4f957a76
BG		 798}
799
2b64d153
BG		 800#define JUST_WORKS 0x00
801#define JUST_CFM 0x01
802#define REQ_PASSKEY 0x02
803#define CFM_PASSKEY 0x03
804#define REQ_OOB 0x04
5e3d3d9b 805#define DSP_PASSKEY 0x05
2b64d153
BG		 806#define OVERLAP 0xFF
807
808static const u8 gen_method[5][5] = {
809 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
810 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
811 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
812 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
813 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
814};
815
5e3d3d9b
JH		 816static const u8 sc_method[5][5] = {
817 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
818 { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
819 { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY },
820 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
821 { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
822};
823
581370cc
JH		 824static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io)
825{
2bcd4003
JH		 826 /* If either side has unknown io_caps, use JUST_CFM (which gets
827 * converted later to JUST_WORKS if we're initiators.
828 */
581370cc
JH		 829 if (local_io > SMP_IO_KEYBOARD_DISPLAY ||
830 remote_io > SMP_IO_KEYBOARD_DISPLAY)
2bcd4003 831 return JUST_CFM;
581370cc 832
5e3d3d9b
JH		 833 if (test_bit(SMP_FLAG_SC, &smp->flags))
834 return sc_method[remote_io][local_io];
835
581370cc
JH		 836 return gen_method[remote_io][local_io];
837}
838
2b64d153
BG		 839static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
840 u8 local_io, u8 remote_io)
841{
842 struct hci_conn *hcon = conn->hcon;
5d88cc73
JH		 843 struct l2cap_chan *chan = conn->smp;
844 struct smp_chan *smp = chan->data;
2b64d153
BG		 845 u32 passkey = 0;
846 int ret = 0;
847
848 /* Initialize key for JUST WORKS */
849 memset(smp->tk, 0, sizeof(smp->tk));
4a74d658 850 clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 851
852 BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io);
853
2bcd4003
JH		 854 /* If neither side wants MITM, either "just" confirm an incoming
855 * request or use just-works for outgoing ones. The JUST_CFM
856 * will be converted to JUST_WORKS if necessary later in this
857 * function. If either side has MITM look up the method from the
858 * table.
859 */
581370cc 860 if (!(auth & SMP_AUTH_MITM))
783e0574 861 smp->method = JUST_CFM;
2b64d153 862 else
783e0574 863 smp->method = get_auth_method(smp, local_io, remote_io);
2b64d153 864
a82505c7 865 /* Don't confirm locally initiated pairing attempts */
783e0574
JH		 866 if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
867 &smp->flags))
868 smp->method = JUST_WORKS;
a82505c7 869
02f3e254 870 /* Don't bother user space with no IO capabilities */
783e0574
JH		 871 if (smp->method == JUST_CFM &&
872 hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
873 smp->method = JUST_WORKS;
02f3e254 874
2b64d153 875 /* If Just Works, Continue with Zero TK */
783e0574 876 if (smp->method == JUST_WORKS) {
4a74d658 877 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 878 return 0;
879 }
880
881 /* Not Just Works/Confirm results in MITM Authentication */
783e0574 882 if (smp->method != JUST_CFM) {
4a74d658 883 set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
5eb596f5
JH		 884 if (hcon->pending_sec_level < BT_SECURITY_HIGH)
885 hcon->pending_sec_level = BT_SECURITY_HIGH;
886 }
2b64d153
BG		 887
888 /* If both devices have Keyoard-Display I/O, the master
889 * Confirms and the slave Enters the passkey.
890 */
783e0574 891 if (smp->method == OVERLAP) {
40bef302 892 if (hcon->role == HCI_ROLE_MASTER)
783e0574 893 smp->method = CFM_PASSKEY;
2b64d153 894 else
783e0574 895 smp->method = REQ_PASSKEY;
2b64d153
BG		 896 }
897
01ad34d2 898 /* Generate random passkey. */
783e0574 899 if (smp->method == CFM_PASSKEY) {
943a732a 900 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153
BG		 901 get_random_bytes(&passkey, sizeof(passkey));
902 passkey %= 1000000;
943a732a 903 put_unaligned_le32(passkey, smp->tk);
2b64d153 904 BT_DBG("PassKey: %d", passkey);
4a74d658 905 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 906 }
907
783e0574 908 if (smp->method == REQ_PASSKEY)
ce39fb4e 909 ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst,
272d90df 910 hcon->type, hcon->dst_type);
783e0574 911 else if (smp->method == JUST_CFM)
4eb65e66
JH		 912 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
913 hcon->type, hcon->dst_type,
914 passkey, 1);
2b64d153 915 else
01ad34d2 916 ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst,
272d90df 917 hcon->type, hcon->dst_type,
39adbffe 918 passkey, 0);
2b64d153 919
2b64d153
BG		 920 return ret;
921}
922
1cc61144 923static u8 smp_confirm(struct smp_chan *smp)
8aab4757 924{
8aab4757 925 struct l2cap_conn *conn = smp->conn;
8aab4757
VCG		 926 struct smp_cmd_pairing_confirm cp;
927 int ret;
8aab4757
VCG		 928
929 BT_DBG("conn %p", conn);
930
e491eaf3 931 ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp,
b1cd5fd9 932 conn->hcon->init_addr_type, &conn->hcon->init_addr,
943a732a
JH		 933 conn->hcon->resp_addr_type, &conn->hcon->resp_addr,
934 cp.confirm_val);
1cc61144
JH		 935 if (ret)
936 return SMP_UNSPECIFIED;
8aab4757 937
4a74d658 938 clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153 939
8aab4757
VCG		 940 smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
941
b28b4943
JH		 942 if (conn->hcon->out)
943 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
944 else
945 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
946
1cc61144 947 return 0;
8aab4757
VCG		 948}
949
861580a9 950static u8 smp_random(struct smp_chan *smp)
8aab4757 951{
8aab4757
VCG		 952 struct l2cap_conn *conn = smp->conn;
953 struct hci_conn *hcon = conn->hcon;
861580a9 954 u8 confirm[16];
8aab4757
VCG		 955 int ret;
956
ec70f36f 957 if (IS_ERR_OR_NULL(smp->tfm_aes))
861580a9 958 return SMP_UNSPECIFIED;
8aab4757
VCG		 959
960 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
961
e491eaf3 962 ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp,
b1cd5fd9 963 hcon->init_addr_type, &hcon->init_addr,
943a732a 964 hcon->resp_addr_type, &hcon->resp_addr, confirm);
861580a9
JH		 965 if (ret)
966 return SMP_UNSPECIFIED;
8aab4757 967
8aab4757
VCG		 968 if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
969 BT_ERR("Pairing failed (confirmation values mismatch)");
861580a9 970 return SMP_CONFIRM_FAILED;
8aab4757
VCG		 971 }
972
973 if (hcon->out) {
fe39c7b2
MH		 974 u8 stk[16];
975 __le64 rand = 0;
976 __le16 ediv = 0;
8aab4757 977
e491eaf3 978 smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk);
8aab4757 979
f7aa611a 980 memset(stk + smp->enc_key_size, 0,
04124681 981 SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
8aab4757 982
861580a9
JH		 983 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
984 return SMP_UNSPECIFIED;
8aab4757
VCG		 985
986 hci_le_start_enc(hcon, ediv, rand, stk);
f7aa611a 987 hcon->enc_key_size = smp->enc_key_size;
fe59a05f 988 set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
8aab4757 989 } else {
fff3490f 990 u8 stk[16], auth;
fe39c7b2
MH		 991 __le64 rand = 0;
992 __le16 ediv = 0;
8aab4757 993
943a732a
JH		 994 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
995 smp->prnd);
8aab4757 996
e491eaf3 997 smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk);
8aab4757 998
f7aa611a 999 memset(stk + smp->enc_key_size, 0,
f1560463 1000 SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
8aab4757 1001
fff3490f
JH		 1002 if (hcon->pending_sec_level == BT_SECURITY_HIGH)
1003 auth = 1;
1004 else
1005 auth = 0;
1006
7d5843b7
JH		 1007 /* Even though there's no _SLAVE suffix this is the
1008 * slave STK we're adding for later lookup (the master
1009 * STK never needs to be stored).
1010 */
ce39fb4e 1011 hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
2ceba539 1012 SMP_STK, auth, stk, smp->enc_key_size, ediv, rand);
8aab4757
VCG		 1013 }
1014
861580a9 1015 return 0;
8aab4757
VCG		 1016}
1017
44f1a7ab
JH		 1018static void smp_notify_keys(struct l2cap_conn *conn)
1019{
1020 struct l2cap_chan *chan = conn->smp;
1021 struct smp_chan *smp = chan->data;
1022 struct hci_conn *hcon = conn->hcon;
1023 struct hci_dev *hdev = hcon->hdev;
1024 struct smp_cmd_pairing *req = (void *) &smp->preq[1];
1025 struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1];
1026 bool persistent;
1027
1028 if (smp->remote_irk) {
1029 mgmt_new_irk(hdev, smp->remote_irk);
1030 /* Now that user space can be considered to know the
1031 * identity address track the connection based on it
b5ae344d 1032 * from now on (assuming this is an LE link).
44f1a7ab 1033 */
b5ae344d
JH		 1034 if (hcon->type == LE_LINK) {
1035 bacpy(&hcon->dst, &smp->remote_irk->bdaddr);
1036 hcon->dst_type = smp->remote_irk->addr_type;
1037 queue_work(hdev->workqueue, &conn->id_addr_update_work);
1038 }
44f1a7ab
JH		 1039
1040 /* When receiving an indentity resolving key for
1041 * a remote device that does not use a resolvable
1042 * private address, just remove the key so that
1043 * it is possible to use the controller white
1044 * list for scanning.
1045 *
1046 * Userspace will have been told to not store
1047 * this key at this point. So it is safe to
1048 * just remove it.
1049 */
1050 if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) {
adae20cb
JH		 1051 list_del_rcu(&smp->remote_irk->list);
1052 kfree_rcu(smp->remote_irk, rcu);
44f1a7ab
JH		 1053 smp->remote_irk = NULL;
1054 }
1055 }
1056
b5ae344d
JH		 1057 if (hcon->type == ACL_LINK) {
1058 if (hcon->key_type == HCI_LK_DEBUG_COMBINATION)
1059 persistent = false;
1060 else
1061 persistent = !test_bit(HCI_CONN_FLUSH_KEY,
1062 &hcon->flags);
1063 } else {
1064 /* The LTKs and CSRKs should be persistent only if both sides
1065 * had the bonding bit set in their authentication requests.
1066 */
1067 persistent = !!((req->auth_req & rsp->auth_req) &
1068 SMP_AUTH_BONDING);
1069 }
1070
44f1a7ab
JH		 1071
1072 if (smp->csrk) {
1073 smp->csrk->bdaddr_type = hcon->dst_type;
1074 bacpy(&smp->csrk->bdaddr, &hcon->dst);
1075 mgmt_new_csrk(hdev, smp->csrk, persistent);
1076 }
1077
1078 if (smp->slave_csrk) {
1079 smp->slave_csrk->bdaddr_type = hcon->dst_type;
1080 bacpy(&smp->slave_csrk->bdaddr, &hcon->dst);
1081 mgmt_new_csrk(hdev, smp->slave_csrk, persistent);
1082 }
1083
1084 if (smp->ltk) {
1085 smp->ltk->bdaddr_type = hcon->dst_type;
1086 bacpy(&smp->ltk->bdaddr, &hcon->dst);
1087 mgmt_new_ltk(hdev, smp->ltk, persistent);
1088 }
1089
1090 if (smp->slave_ltk) {
1091 smp->slave_ltk->bdaddr_type = hcon->dst_type;
1092 bacpy(&smp->slave_ltk->bdaddr, &hcon->dst);
1093 mgmt_new_ltk(hdev, smp->slave_ltk, persistent);
1094 }
6a77083a
JH		 1095
1096 if (smp->link_key) {
e3befab9
JH		 1097 struct link_key *key;
1098 u8 type;
1099
1100 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1101 type = HCI_LK_DEBUG_COMBINATION;
1102 else if (hcon->sec_level == BT_SECURITY_FIPS)
1103 type = HCI_LK_AUTH_COMBINATION_P256;
1104 else
1105 type = HCI_LK_UNAUTH_COMBINATION_P256;
1106
1107 key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst,
1108 smp->link_key, type, 0, &persistent);
1109 if (key) {
1110 mgmt_new_link_key(hdev, key, persistent);
1111
1112 /* Don't keep debug keys around if the relevant
1113 * flag is not set.
1114 */
d7a5a11d 1115 if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) &&
e3befab9
JH		 1116 key->type == HCI_LK_DEBUG_COMBINATION) {
1117 list_del_rcu(&key->list);
1118 kfree_rcu(key, rcu);
1119 }
1120 }
6a77083a
JH		 1121 }
1122}
1123
d3e54a87
JH		 1124static void sc_add_ltk(struct smp_chan *smp)
1125{
1126 struct hci_conn *hcon = smp->conn->hcon;
1127 u8 key_type, auth;
1128
1129 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1130 key_type = SMP_LTK_P256_DEBUG;
1131 else
1132 key_type = SMP_LTK_P256;
1133
1134 if (hcon->pending_sec_level == BT_SECURITY_FIPS)
1135 auth = 1;
1136 else
1137 auth = 0;
1138
1139 memset(smp->tk + smp->enc_key_size, 0,
1140 SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
1141
1142 smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
1143 key_type, auth, smp->tk, smp->enc_key_size,
1144 0, 0);
1145}
1146
6a77083a
JH		 1147static void sc_generate_link_key(struct smp_chan *smp)
1148{
1149 /* These constants are as specified in the core specification.
1150 * In ASCII they spell out to 'tmp1' and 'lebr'.
1151 */
1152 const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 };
1153 const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c };
1154
1155 smp->link_key = kzalloc(16, GFP_KERNEL);
1156 if (!smp->link_key)
1157 return;
1158
1159 if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) {
276812ec 1160 kzfree(smp->link_key);
6a77083a
JH		 1161 smp->link_key = NULL;
1162 return;
1163 }
1164
1165 if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) {
276812ec 1166 kzfree(smp->link_key);
6a77083a
JH		 1167 smp->link_key = NULL;
1168 return;
1169 }
44f1a7ab
JH		 1170}
1171
b28b4943
JH		 1172static void smp_allow_key_dist(struct smp_chan *smp)
1173{
1174 /* Allow the first expected phase 3 PDU. The rest of the PDUs
1175 * will be allowed in each PDU handler to ensure we receive
1176 * them in the correct order.
1177 */
1178 if (smp->remote_key_dist & SMP_DIST_ENC_KEY)
1179 SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO);
1180 else if (smp->remote_key_dist & SMP_DIST_ID_KEY)
1181 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
1182 else if (smp->remote_key_dist & SMP_DIST_SIGN)
1183 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
1184}
1185
b5ae344d
JH		 1186static void sc_generate_ltk(struct smp_chan *smp)
1187{
1188 /* These constants are as specified in the core specification.
1189 * In ASCII they spell out to 'tmp2' and 'brle'.
1190 */
1191 const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 };
1192 const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 };
1193 struct hci_conn *hcon = smp->conn->hcon;
1194 struct hci_dev *hdev = hcon->hdev;
1195 struct link_key *key;
1196
1197 key = hci_find_link_key(hdev, &hcon->dst);
1198 if (!key) {
1199 BT_ERR("%s No Link Key found to generate LTK", hdev->name);
1200 return;
1201 }
1202
1203 if (key->type == HCI_LK_DEBUG_COMBINATION)
1204 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1205
1206 if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk))
1207 return;
1208
1209 if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk))
1210 return;
1211
1212 sc_add_ltk(smp);
1213}
1214
d6268e86 1215static void smp_distribute_keys(struct smp_chan *smp)
44f1a7ab
JH		 1216{
1217 struct smp_cmd_pairing *req, *rsp;
86d1407c 1218 struct l2cap_conn *conn = smp->conn;
44f1a7ab
JH		 1219 struct hci_conn *hcon = conn->hcon;
1220 struct hci_dev *hdev = hcon->hdev;
1221 __u8 *keydist;
1222
1223 BT_DBG("conn %p", conn);
1224
44f1a7ab
JH		 1225 rsp = (void *) &smp->prsp[1];
1226
1227 /* The responder sends its keys first */
b28b4943
JH		 1228 if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) {
1229 smp_allow_key_dist(smp);
86d1407c 1230 return;
b28b4943 1231 }
44f1a7ab
JH		 1232
1233 req = (void *) &smp->preq[1];
1234
1235 if (hcon->out) {
1236 keydist = &rsp->init_key_dist;
1237 *keydist &= req->init_key_dist;
1238 } else {
1239 keydist = &rsp->resp_key_dist;
1240 *keydist &= req->resp_key_dist;
1241 }
1242
6a77083a 1243 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
b5ae344d 1244 if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY))
6a77083a 1245 sc_generate_link_key(smp);
b5ae344d
JH		 1246 if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY))
1247 sc_generate_ltk(smp);
6a77083a
JH		 1248
1249 /* Clear the keys which are generated but not distributed */
1250 *keydist &= ~SMP_SC_NO_DIST;
1251 }
1252
44f1a7ab
JH		 1253 BT_DBG("keydist 0x%x", *keydist);
1254
1255 if (*keydist & SMP_DIST_ENC_KEY) {
1256 struct smp_cmd_encrypt_info enc;
1257 struct smp_cmd_master_ident ident;
1258 struct smp_ltk *ltk;
1259 u8 authenticated;
1260 __le16 ediv;
1261 __le64 rand;
1262
1263 get_random_bytes(enc.ltk, sizeof(enc.ltk));
1264 get_random_bytes(&ediv, sizeof(ediv));
1265 get_random_bytes(&rand, sizeof(rand));
1266
1267 smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
1268
1269 authenticated = hcon->sec_level == BT_SECURITY_HIGH;
1270 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type,
1271 SMP_LTK_SLAVE, authenticated, enc.ltk,
1272 smp->enc_key_size, ediv, rand);
1273 smp->slave_ltk = ltk;
1274
1275 ident.ediv = ediv;
1276 ident.rand = rand;
1277
1278 smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident);
1279
1280 *keydist &= ~SMP_DIST_ENC_KEY;
1281 }
1282
1283 if (*keydist & SMP_DIST_ID_KEY) {
1284 struct smp_cmd_ident_addr_info addrinfo;
1285 struct smp_cmd_ident_info idinfo;
1286
1287 memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk));
1288
1289 smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
1290
1291 /* The hci_conn contains the local identity address
1292 * after the connection has been established.
1293 *
1294 * This is true even when the connection has been
1295 * established using a resolvable random address.
1296 */
1297 bacpy(&addrinfo.bdaddr, &hcon->src);
1298 addrinfo.addr_type = hcon->src_type;
1299
1300 smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
1301 &addrinfo);
1302
1303 *keydist &= ~SMP_DIST_ID_KEY;
1304 }
1305
1306 if (*keydist & SMP_DIST_SIGN) {
1307 struct smp_cmd_sign_info sign;
1308 struct smp_csrk *csrk;
1309
1310 /* Generate a new random key */
1311 get_random_bytes(sign.csrk, sizeof(sign.csrk));
1312
1313 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
1314 if (csrk) {
4cd3928a
JH		 1315 if (hcon->sec_level > BT_SECURITY_MEDIUM)
1316 csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED;
1317 else
1318 csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED;
44f1a7ab
JH		 1319 memcpy(csrk->val, sign.csrk, sizeof(csrk->val));
1320 }
1321 smp->slave_csrk = csrk;
1322
1323 smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
1324
1325 *keydist &= ~SMP_DIST_SIGN;
1326 }
1327
1328 /* If there are still keys to be received wait for them */
b28b4943
JH		 1329 if (smp->remote_key_dist & KEY_DIST_MASK) {
1330 smp_allow_key_dist(smp);
86d1407c 1331 return;
b28b4943 1332 }
44f1a7ab 1333
44f1a7ab
JH		 1334 set_bit(SMP_FLAG_COMPLETE, &smp->flags);
1335 smp_notify_keys(conn);
1336
1337 smp_chan_destroy(conn);
44f1a7ab
JH		 1338}
1339
b68fda68
JH		 1340static void smp_timeout(struct work_struct *work)
1341{
1342 struct smp_chan *smp = container_of(work, struct smp_chan,
1343 security_timer.work);
1344 struct l2cap_conn *conn = smp->conn;
1345
1346 BT_DBG("conn %p", conn);
1347
1e91c29e 1348 hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM);
b68fda68
JH		 1349}
1350
8aab4757
VCG		 1351static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
1352{
5d88cc73 1353 struct l2cap_chan *chan = conn->smp;
8aab4757
VCG		 1354 struct smp_chan *smp;
1355
f1560463 1356 smp = kzalloc(sizeof(*smp), GFP_ATOMIC);
fc75cc86 1357 if (!smp)
8aab4757
VCG		 1358 return NULL;
1359
6a7bd103
JH		 1360 smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
1361 if (IS_ERR(smp->tfm_aes)) {
1362 BT_ERR("Unable to create ECB crypto context");
276812ec 1363 kzfree(smp);
6a7bd103
JH		 1364 return NULL;
1365 }
1366
407cecf6
JH		 1367 smp->tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC);
1368 if (IS_ERR(smp->tfm_cmac)) {
1369 BT_ERR("Unable to create CMAC crypto context");
1370 crypto_free_blkcipher(smp->tfm_aes);
276812ec 1371 kzfree(smp);
407cecf6
JH		 1372 return NULL;
1373 }
1374
8aab4757 1375 smp->conn = conn;
5d88cc73 1376 chan->data = smp;
8aab4757 1377
b28b4943
JH		 1378 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL);
1379
b68fda68
JH		 1380 INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
1381
8aab4757
VCG		 1382 hci_conn_hold(conn->hcon);
1383
1384 return smp;
1385}
1386
760b018b
JH		 1387static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16])
1388{
1389 struct hci_conn *hcon = smp->conn->hcon;
1390 u8 *na, *nb, a[7], b[7];
1391
1392 if (hcon->out) {
1393 na = smp->prnd;
1394 nb = smp->rrnd;
1395 } else {
1396 na = smp->rrnd;
1397 nb = smp->prnd;
1398 }
1399
1400 memcpy(a, &hcon->init_addr, 6);
1401 memcpy(b, &hcon->resp_addr, 6);
1402 a[6] = hcon->init_addr_type;
1403 b[6] = hcon->resp_addr_type;
1404
1405 return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk);
1406}
1407
38606f14 1408static void sc_dhkey_check(struct smp_chan *smp)
760b018b
JH		 1409{
1410 struct hci_conn *hcon = smp->conn->hcon;
1411 struct smp_cmd_dhkey_check check;
1412 u8 a[7], b[7], *local_addr, *remote_addr;
1413 u8 io_cap[3], r[16];
1414
760b018b
JH		 1415 memcpy(a, &hcon->init_addr, 6);
1416 memcpy(b, &hcon->resp_addr, 6);
1417 a[6] = hcon->init_addr_type;
1418 b[6] = hcon->resp_addr_type;
1419
1420 if (hcon->out) {
1421 local_addr = a;
1422 remote_addr = b;
1423 memcpy(io_cap, &smp->preq[1], 3);
1424 } else {
1425 local_addr = b;
1426 remote_addr = a;
1427 memcpy(io_cap, &smp->prsp[1], 3);
1428 }
1429
dddd3059
JH		 1430 memset(r, 0, sizeof(r));
1431
1432 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
38606f14 1433 put_unaligned_le32(hcon->passkey_notify, r);
760b018b 1434
a29b0733
JH		 1435 if (smp->method == REQ_OOB)
1436 memcpy(r, smp->rr, 16);
1437
760b018b
JH		 1438 smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
1439 local_addr, remote_addr, check.e);
1440
1441 smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check);
dddd3059
JH		 1442}
1443
38606f14
JH		 1444static u8 sc_passkey_send_confirm(struct smp_chan *smp)
1445{
1446 struct l2cap_conn *conn = smp->conn;
1447 struct hci_conn *hcon = conn->hcon;
1448 struct smp_cmd_pairing_confirm cfm;
1449 u8 r;
1450
1451 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1452 r |= 0x80;
1453
1454 get_random_bytes(smp->prnd, sizeof(smp->prnd));
1455
1456 if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r,
1457 cfm.confirm_val))
1458 return SMP_UNSPECIFIED;
1459
1460 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
1461
1462 return 0;
1463}
1464
1465static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op)
1466{
1467 struct l2cap_conn *conn = smp->conn;
1468 struct hci_conn *hcon = conn->hcon;
1469 struct hci_dev *hdev = hcon->hdev;
1470 u8 cfm[16], r;
1471
1472 /* Ignore the PDU if we've already done 20 rounds (0 - 19) */
1473 if (smp->passkey_round >= 20)
1474 return 0;
1475
1476 switch (smp_op) {
1477 case SMP_CMD_PAIRING_RANDOM:
1478 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1479 r |= 0x80;
1480
1481 if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
1482 smp->rrnd, r, cfm))
1483 return SMP_UNSPECIFIED;
1484
1485 if (memcmp(smp->pcnf, cfm, 16))
1486 return SMP_CONFIRM_FAILED;
1487
1488 smp->passkey_round++;
1489
1490 if (smp->passkey_round == 20) {
1491 /* Generate MacKey and LTK */
1492 if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk))
1493 return SMP_UNSPECIFIED;
1494 }
1495
1496 /* The round is only complete when the initiator
1497 * receives pairing random.
1498 */
1499 if (!hcon->out) {
1500 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1501 sizeof(smp->prnd), smp->prnd);
d3e54a87 1502 if (smp->passkey_round == 20)
38606f14 1503 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
d3e54a87 1504 else
38606f14 1505 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
38606f14
JH		 1506 return 0;
1507 }
1508
1509 /* Start the next round */
1510 if (smp->passkey_round != 20)
1511 return sc_passkey_round(smp, 0);
1512
1513 /* Passkey rounds are complete - start DHKey Check */
1514 sc_dhkey_check(smp);
1515 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1516
1517 break;
1518
1519 case SMP_CMD_PAIRING_CONFIRM:
1520 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
1521 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
1522 return 0;
1523 }
1524
1525 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1526
1527 if (hcon->out) {
1528 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1529 sizeof(smp->prnd), smp->prnd);
1530 return 0;
1531 }
1532
1533 return sc_passkey_send_confirm(smp);
1534
1535 case SMP_CMD_PUBLIC_KEY:
1536 default:
1537 /* Initiating device starts the round */
1538 if (!hcon->out)
1539 return 0;
1540
1541 BT_DBG("%s Starting passkey round %u", hdev->name,
1542 smp->passkey_round + 1);
1543
1544 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1545
1546 return sc_passkey_send_confirm(smp);
1547 }
1548
1549 return 0;
1550}
1551
dddd3059
JH		 1552static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey)
1553{
38606f14
JH		 1554 struct l2cap_conn *conn = smp->conn;
1555 struct hci_conn *hcon = conn->hcon;
1556 u8 smp_op;
1557
1558 clear_bit(SMP_FLAG_WAIT_USER, &smp->flags);
1559
dddd3059
JH		 1560 switch (mgmt_op) {
1561 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1562 smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED);
1563 return 0;
1564 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
1565 smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED);
1566 return 0;
38606f14
JH		 1567 case MGMT_OP_USER_PASSKEY_REPLY:
1568 hcon->passkey_notify = le32_to_cpu(passkey);
1569 smp->passkey_round = 0;
1570
1571 if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags))
1572 smp_op = SMP_CMD_PAIRING_CONFIRM;
1573 else
1574 smp_op = 0;
1575
1576 if (sc_passkey_round(smp, smp_op))
1577 return -EIO;
1578
1579 return 0;
dddd3059
JH		 1580 }
1581
d3e54a87
JH		 1582 /* Initiator sends DHKey check first */
1583 if (hcon->out) {
1584 sc_dhkey_check(smp);
1585 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1586 } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) {
1587 sc_dhkey_check(smp);
1588 sc_add_ltk(smp);
1589 }
760b018b
JH		 1590
1591 return 0;
1592}
1593
2b64d153
BG		 1594int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
1595{
b10e8017 1596 struct l2cap_conn *conn = hcon->l2cap_data;
5d88cc73 1597 struct l2cap_chan *chan;
2b64d153
BG		 1598 struct smp_chan *smp;
1599 u32 value;
fc75cc86 1600 int err;
2b64d153
BG		 1601
1602 BT_DBG("");
1603
fc75cc86 1604 if (!conn)
2b64d153
BG		 1605 return -ENOTCONN;
1606
5d88cc73
JH		 1607 chan = conn->smp;
1608 if (!chan)
1609 return -ENOTCONN;
1610
fc75cc86
JH		 1611 l2cap_chan_lock(chan);
1612 if (!chan->data) {
1613 err = -ENOTCONN;
1614 goto unlock;
1615 }
1616
5d88cc73 1617 smp = chan->data;
2b64d153 1618
760b018b
JH		 1619 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1620 err = sc_user_reply(smp, mgmt_op, passkey);
1621 goto unlock;
1622 }
1623
2b64d153
BG		 1624 switch (mgmt_op) {
1625 case MGMT_OP_USER_PASSKEY_REPLY:
1626 value = le32_to_cpu(passkey);
943a732a 1627 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153 1628 BT_DBG("PassKey: %d", value);
943a732a 1629 put_unaligned_le32(value, smp->tk);
2b64d153
BG		 1630 /* Fall Through */
1631 case MGMT_OP_USER_CONFIRM_REPLY:
4a74d658 1632 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 1633 break;
1634 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1635 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
84794e11 1636 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1637 err = 0;
1638 goto unlock;
2b64d153 1639 default:
84794e11 1640 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1641 err = -EOPNOTSUPP;
1642 goto unlock;
2b64d153
BG		 1643 }
1644
fc75cc86
JH		 1645 err = 0;
1646
2b64d153 1647 /* If it is our turn to send Pairing Confirm, do so now */
1cc61144
JH		 1648 if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
1649 u8 rsp = smp_confirm(smp);
1650 if (rsp)
1651 smp_failure(conn, rsp);
1652 }
2b64d153 1653
fc75cc86
JH		 1654unlock:
1655 l2cap_chan_unlock(chan);
1656 return err;
2b64d153
BG		 1657}
1658
b5ae344d
JH		 1659static void build_bredr_pairing_cmd(struct smp_chan *smp,
1660 struct smp_cmd_pairing *req,
1661 struct smp_cmd_pairing *rsp)
1662{
1663 struct l2cap_conn *conn = smp->conn;
1664 struct hci_dev *hdev = conn->hcon->hdev;
1665 u8 local_dist = 0, remote_dist = 0;
1666
d7a5a11d 1667 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
b5ae344d
JH		 1668 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1669 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1670 }
1671
d7a5a11d 1672 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
b5ae344d
JH		 1673 remote_dist |= SMP_DIST_ID_KEY;
1674
d7a5a11d 1675 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
b5ae344d
JH		 1676 local_dist |= SMP_DIST_ID_KEY;
1677
1678 if (!rsp) {
1679 memset(req, 0, sizeof(*req));
1680
1681 req->init_key_dist = local_dist;
1682 req->resp_key_dist = remote_dist;
1683 req->max_key_size = SMP_MAX_ENC_KEY_SIZE;
1684
1685 smp->remote_key_dist = remote_dist;
1686
1687 return;
1688 }
1689
1690 memset(rsp, 0, sizeof(*rsp));
1691
1692 rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
1693 rsp->init_key_dist = req->init_key_dist & remote_dist;
1694 rsp->resp_key_dist = req->resp_key_dist & local_dist;
1695
1696 smp->remote_key_dist = rsp->init_key_dist;
1697}
1698
da85e5e5 1699static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1700{
3158c50c 1701 struct smp_cmd_pairing rsp, *req = (void *) skb->data;
fc75cc86 1702 struct l2cap_chan *chan = conn->smp;
b3c6410b 1703 struct hci_dev *hdev = conn->hcon->hdev;
8aab4757 1704 struct smp_chan *smp;
c7262e71 1705 u8 key_size, auth, sec_level;
8aab4757 1706 int ret;
88ba43b6
AB		 1707
1708 BT_DBG("conn %p", conn);
1709
c46b98be 1710 if (skb->len < sizeof(*req))
38e4a915 1711 return SMP_INVALID_PARAMS;
c46b98be 1712
40bef302 1713 if (conn->hcon->role != HCI_ROLE_SLAVE)
2b64d153
BG		 1714 return SMP_CMD_NOTSUPP;
1715
fc75cc86 1716 if (!chan->data)
8aab4757 1717 smp = smp_chan_create(conn);
fc75cc86 1718 else
5d88cc73 1719 smp = chan->data;
8aab4757 1720
d08fd0e7
AE		 1721 if (!smp)
1722 return SMP_UNSPECIFIED;
d26a2345 1723
c05b9339 1724 /* We didn't start the pairing, so match remote */
0edb14de 1725 auth = req->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1726
d7a5a11d 1727 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 1728 (auth & SMP_AUTH_BONDING))
b3c6410b
JH		 1729 return SMP_PAIRING_NOTSUPP;
1730
d7a5a11d 1731 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1732 return SMP_AUTH_REQUIREMENTS;
1733
1c1def09
VCG		 1734 smp->preq[0] = SMP_CMD_PAIRING_REQ;
1735 memcpy(&smp->preq[1], req, sizeof(*req));
3158c50c 1736 skb_pull(skb, sizeof(*req));
88ba43b6 1737
58428563
JH		 1738 if (req->oob_flag == SMP_OOB_PRESENT)
1739 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1740
b5ae344d
JH		 1741 /* SMP over BR/EDR requires special treatment */
1742 if (conn->hcon->type == ACL_LINK) {
1743 /* We must have a BR/EDR SC link */
08f63cc5 1744 if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) &&
b7cb93e5 1745 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 1746 return SMP_CROSS_TRANSP_NOT_ALLOWED;
1747
1748 set_bit(SMP_FLAG_SC, &smp->flags);
1749
1750 build_bredr_pairing_cmd(smp, req, &rsp);
1751
1752 key_size = min(req->max_key_size, rsp.max_key_size);
1753 if (check_enc_key_size(conn, key_size))
1754 return SMP_ENC_KEY_SIZE;
1755
1756 /* Clear bits which are generated but not distributed */
1757 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1758
1759 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1760 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
1761 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
1762
1763 smp_distribute_keys(smp);
1764 return 0;
1765 }
1766
5e3d3d9b
JH		 1767 build_pairing_cmd(conn, req, &rsp, auth);
1768
1769 if (rsp.auth_req & SMP_AUTH_SC)
1770 set_bit(SMP_FLAG_SC, &smp->flags);
1771
5be5e275 1772 if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 1773 sec_level = BT_SECURITY_MEDIUM;
1774 else
1775 sec_level = authreq_to_seclevel(auth);
1776
c7262e71
JH		 1777 if (sec_level > conn->hcon->pending_sec_level)
1778 conn->hcon->pending_sec_level = sec_level;
fdde0a26 1779
49c922bb 1780 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1781 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1782 u8 method;
1783
1784 method = get_auth_method(smp, conn->hcon->io_capability,
1785 req->io_capability);
1786 if (method == JUST_WORKS || method == JUST_CFM)
1787 return SMP_AUTH_REQUIREMENTS;
1788 }
1789
3158c50c
VCG		 1790 key_size = min(req->max_key_size, rsp.max_key_size);
1791 if (check_enc_key_size(conn, key_size))
1792 return SMP_ENC_KEY_SIZE;
88ba43b6 1793
e84a6b13 1794 get_random_bytes(smp->prnd, sizeof(smp->prnd));
8aab4757 1795
1c1def09
VCG		 1796 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1797 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
f01ead31 1798
3158c50c 1799 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
3b19146d
JH		 1800
1801 clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
1802
1803 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1804 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1805 /* Clear bits which are generated but not distributed */
1806 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1807 /* Wait for Public Key from Initiating Device */
1808 return 0;
3b19146d 1809 }
da85e5e5 1810
983f9814
MH		 1811 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1812
2b64d153
BG		 1813 /* Request setup of TK */
1814 ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
1815 if (ret)
1816 return SMP_UNSPECIFIED;
1817
da85e5e5 1818 return 0;
88ba43b6
AB		 1819}
1820
3b19146d
JH		 1821static u8 sc_send_public_key(struct smp_chan *smp)
1822{
70157ef5
JH		 1823 struct hci_dev *hdev = smp->conn->hcon->hdev;
1824
3b19146d
JH		 1825 BT_DBG("");
1826
1a8bab4f 1827 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
33d0c030
MH		 1828 struct l2cap_chan *chan = hdev->smp_data;
1829 struct smp_dev *smp_dev;
1830
1831 if (!chan || !chan->data)
1832 return SMP_UNSPECIFIED;
1833
1834 smp_dev = chan->data;
1835
1836 memcpy(smp->local_pk, smp_dev->local_pk, 64);
1837 memcpy(smp->local_sk, smp_dev->local_sk, 32);
882fafad 1838 memcpy(smp->lr, smp_dev->local_rr, 16);
33d0c030
MH		 1839
1840 if (smp_dev->debug_key)
1841 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1842
1843 goto done;
1844 }
1845
d7a5a11d 1846 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
70157ef5
JH		 1847 BT_DBG("Using debug keys");
1848 memcpy(smp->local_pk, debug_pk, 64);
1849 memcpy(smp->local_sk, debug_sk, 32);
1850 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1851 } else {
1852 while (true) {
1853 /* Generate local key pair for Secure Connections */
1854 if (!ecc_make_key(smp->local_pk, smp->local_sk))
1855 return SMP_UNSPECIFIED;
6c0dcc50 1856
70157ef5
JH		 1857 /* This is unlikely, but we need to check that
1858 * we didn't accidentially generate a debug key.
1859 */
1860 if (memcmp(smp->local_sk, debug_sk, 32))
1861 break;
1862 }
6c0dcc50 1863 }
3b19146d 1864
33d0c030 1865done:
c7a3d57d 1866 SMP_DBG("Local Public Key X: %32phN", smp->local_pk);
8e4e2ee5 1867 SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32);
c7a3d57d 1868 SMP_DBG("Local Private Key: %32phN", smp->local_sk);
3b19146d
JH		 1869
1870 smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk);
1871
1872 return 0;
1873}
1874
da85e5e5 1875static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1876{
3158c50c 1877 struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
5d88cc73
JH		 1878 struct l2cap_chan *chan = conn->smp;
1879 struct smp_chan *smp = chan->data;
0edb14de 1880 struct hci_dev *hdev = conn->hcon->hdev;
3a7dbfb8 1881 u8 key_size, auth;
7d24ddcc 1882 int ret;
88ba43b6
AB		 1883
1884 BT_DBG("conn %p", conn);
1885
c46b98be 1886 if (skb->len < sizeof(*rsp))
38e4a915 1887 return SMP_INVALID_PARAMS;
c46b98be 1888
40bef302 1889 if (conn->hcon->role != HCI_ROLE_MASTER)
2b64d153
BG		 1890 return SMP_CMD_NOTSUPP;
1891
3158c50c
VCG		 1892 skb_pull(skb, sizeof(*rsp));
1893
1c1def09 1894 req = (void *) &smp->preq[1];
da85e5e5 1895
3158c50c
VCG		 1896 key_size = min(req->max_key_size, rsp->max_key_size);
1897 if (check_enc_key_size(conn, key_size))
1898 return SMP_ENC_KEY_SIZE;
1899
0edb14de 1900 auth = rsp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1901
d7a5a11d 1902 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1903 return SMP_AUTH_REQUIREMENTS;
1904
58428563
JH		 1905 if (rsp->oob_flag == SMP_OOB_PRESENT)
1906 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1907
b5ae344d
JH		 1908 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1909 memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
1910
1911 /* Update remote key distribution in case the remote cleared
1912 * some bits that we had enabled in our request.
1913 */
1914 smp->remote_key_dist &= rsp->resp_key_dist;
1915
1916 /* For BR/EDR this means we're done and can start phase 3 */
1917 if (conn->hcon->type == ACL_LINK) {
1918 /* Clear bits which are generated but not distributed */
1919 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1920 smp_distribute_keys(smp);
1921 return 0;
1922 }
1923
65668776
JH		 1924 if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC))
1925 set_bit(SMP_FLAG_SC, &smp->flags);
d2eb9e10
JH		 1926 else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH)
1927 conn->hcon->pending_sec_level = BT_SECURITY_HIGH;
65668776 1928
49c922bb 1929 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1930 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1931 u8 method;
1932
1933 method = get_auth_method(smp, req->io_capability,
1934 rsp->io_capability);
1935 if (method == JUST_WORKS || method == JUST_CFM)
1936 return SMP_AUTH_REQUIREMENTS;
1937 }
1938
e84a6b13 1939 get_random_bytes(smp->prnd, sizeof(smp->prnd));
7d24ddcc 1940
fdcc4bec
JH		 1941 /* Update remote key distribution in case the remote cleared
1942 * some bits that we had enabled in our request.
1943 */
1944 smp->remote_key_dist &= rsp->resp_key_dist;
1945
3b19146d
JH		 1946 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1947 /* Clear bits which are generated but not distributed */
1948 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1949 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1950 return sc_send_public_key(smp);
1951 }
1952
c05b9339 1953 auth |= req->auth_req;
2b64d153 1954
476585ec 1955 ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
2b64d153
BG		 1956 if (ret)
1957 return SMP_UNSPECIFIED;
1958
4a74d658 1959 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153
BG		 1960
1961 /* Can't compose response until we have been confirmed */
4a74d658 1962 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 1963 return smp_confirm(smp);
da85e5e5
VCG		 1964
1965 return 0;
88ba43b6
AB		 1966}
1967
dcee2b32
JH		 1968static u8 sc_check_confirm(struct smp_chan *smp)
1969{
1970 struct l2cap_conn *conn = smp->conn;
1971
1972 BT_DBG("");
1973
1974 /* Public Key exchange must happen before any other steps */
1975 if (!test_bit(SMP_FLAG_REMOTE_PK, &smp->flags))
1976 return SMP_UNSPECIFIED;
1977
38606f14
JH		 1978 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
1979 return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM);
1980
dcee2b32
JH		 1981 if (conn->hcon->out) {
1982 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
1983 smp->prnd);
1984 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1985 }
1986
1987 return 0;
1988}
1989
da85e5e5 1990static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1991{
5d88cc73
JH		 1992 struct l2cap_chan *chan = conn->smp;
1993 struct smp_chan *smp = chan->data;
7d24ddcc 1994
88ba43b6
AB		 1995 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
1996
c46b98be 1997 if (skb->len < sizeof(smp->pcnf))
38e4a915 1998 return SMP_INVALID_PARAMS;
c46b98be 1999
1c1def09
VCG		 2000 memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
2001 skb_pull(skb, sizeof(smp->pcnf));
88ba43b6 2002
dcee2b32
JH		 2003 if (test_bit(SMP_FLAG_SC, &smp->flags))
2004 return sc_check_confirm(smp);
2005
b28b4943 2006 if (conn->hcon->out) {
943a732a
JH		 2007 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2008 smp->prnd);
b28b4943
JH		 2009 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2010 return 0;
2011 }
2012
2013 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2014 return smp_confirm(smp);
983f9814
MH		 2015
2016 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
da85e5e5
VCG		 2017
2018 return 0;
88ba43b6
AB		 2019}
2020
da85e5e5 2021static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2022{
5d88cc73
JH		 2023 struct l2cap_chan *chan = conn->smp;
2024 struct smp_chan *smp = chan->data;
191dc7fe
JH		 2025 struct hci_conn *hcon = conn->hcon;
2026 u8 *pkax, *pkbx, *na, *nb;
2027 u32 passkey;
2028 int err;
7d24ddcc 2029
8aab4757 2030 BT_DBG("conn %p", conn);
3158c50c 2031
c46b98be 2032 if (skb->len < sizeof(smp->rrnd))
38e4a915 2033 return SMP_INVALID_PARAMS;
c46b98be 2034
943a732a 2035 memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
8aab4757 2036 skb_pull(skb, sizeof(smp->rrnd));
e7e62c85 2037
191dc7fe
JH		 2038 if (!test_bit(SMP_FLAG_SC, &smp->flags))
2039 return smp_random(smp);
2040
580039e8
JH		 2041 if (hcon->out) {
2042 pkax = smp->local_pk;
2043 pkbx = smp->remote_pk;
2044 na = smp->prnd;
2045 nb = smp->rrnd;
2046 } else {
2047 pkax = smp->remote_pk;
2048 pkbx = smp->local_pk;
2049 na = smp->rrnd;
2050 nb = smp->prnd;
2051 }
2052
a29b0733
JH		 2053 if (smp->method == REQ_OOB) {
2054 if (!hcon->out)
2055 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2056 sizeof(smp->prnd), smp->prnd);
2057 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2058 goto mackey_and_ltk;
2059 }
2060
38606f14
JH		 2061 /* Passkey entry has special treatment */
2062 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2063 return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
2064
191dc7fe
JH		 2065 if (hcon->out) {
2066 u8 cfm[16];
2067
2068 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
2069 smp->rrnd, 0, cfm);
2070 if (err)
2071 return SMP_UNSPECIFIED;
2072
2073 if (memcmp(smp->pcnf, cfm, 16))
2074 return SMP_CONFIRM_FAILED;
191dc7fe
JH		 2075 } else {
2076 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2077 smp->prnd);
2078 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
191dc7fe
JH		 2079 }
2080
a29b0733 2081mackey_and_ltk:
760b018b
JH		 2082 /* Generate MacKey and LTK */
2083 err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
2084 if (err)
2085 return SMP_UNSPECIFIED;
2086
a29b0733 2087 if (smp->method == JUST_WORKS || smp->method == REQ_OOB) {
dddd3059 2088 if (hcon->out) {
38606f14 2089 sc_dhkey_check(smp);
dddd3059
JH		 2090 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2091 }
2092 return 0;
2093 }
2094
38606f14
JH		 2095 err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
2096 if (err)
2097 return SMP_UNSPECIFIED;
2098
2099 err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type,
2100 hcon->dst_type, passkey, 0);
191dc7fe
JH		 2101 if (err)
2102 return SMP_UNSPECIFIED;
2103
38606f14
JH		 2104 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2105
191dc7fe 2106 return 0;
88ba43b6
AB		 2107}
2108
f81cd823 2109static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
988c5997 2110{
c9839a11 2111 struct smp_ltk *key;
988c5997
VCG		 2112 struct hci_conn *hcon = conn->hcon;
2113
f3a73d97 2114 key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role);
988c5997 2115 if (!key)
f81cd823 2116 return false;
988c5997 2117
a6f7833c 2118 if (smp_ltk_sec_level(key) < sec_level)
f81cd823 2119 return false;
4dab7864 2120
51a8efd7 2121 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
f81cd823 2122 return true;
988c5997 2123
c9839a11
VCG		 2124 hci_le_start_enc(hcon, key->ediv, key->rand, key->val);
2125 hcon->enc_key_size = key->enc_size;
988c5997 2126
fe59a05f
JH		 2127 /* We never store STKs for master role, so clear this flag */
2128 clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
2129
f81cd823 2130 return true;
988c5997 2131}
f1560463 2132
35dc6f83
JH		 2133bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
2134 enum smp_key_pref key_pref)
854f4727
JH		 2135{
2136 if (sec_level == BT_SECURITY_LOW)
2137 return true;
2138
35dc6f83
JH		 2139 /* If we're encrypted with an STK but the caller prefers using
2140 * LTK claim insufficient security. This way we allow the
2141 * connection to be re-encrypted with an LTK, even if the LTK
2142 * provides the same level of security. Only exception is if we
2143 * don't have an LTK (e.g. because of key distribution bits).
9ab65d60 2144 */
35dc6f83
JH		 2145 if (key_pref == SMP_USE_LTK &&
2146 test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
f3a73d97 2147 hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role))
9ab65d60
JH		 2148 return false;
2149
854f4727
JH		 2150 if (hcon->sec_level >= sec_level)
2151 return true;
2152
2153 return false;
2154}
2155
da85e5e5 2156static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6
AB		 2157{
2158 struct smp_cmd_security_req *rp = (void *) skb->data;
2159 struct smp_cmd_pairing cp;
f1cb9af5 2160 struct hci_conn *hcon = conn->hcon;
0edb14de 2161 struct hci_dev *hdev = hcon->hdev;
8aab4757 2162 struct smp_chan *smp;
c05b9339 2163 u8 sec_level, auth;
88ba43b6
AB		 2164
2165 BT_DBG("conn %p", conn);
2166
c46b98be 2167 if (skb->len < sizeof(*rp))
38e4a915 2168 return SMP_INVALID_PARAMS;
c46b98be 2169
40bef302 2170 if (hcon->role != HCI_ROLE_MASTER)
86ca9eac
JH		 2171 return SMP_CMD_NOTSUPP;
2172
0edb14de 2173 auth = rp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 2174
d7a5a11d 2175 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 2176 return SMP_AUTH_REQUIREMENTS;
2177
5be5e275 2178 if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 2179 sec_level = BT_SECURITY_MEDIUM;
2180 else
2181 sec_level = authreq_to_seclevel(auth);
2182
35dc6f83 2183 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
854f4727
JH		 2184 return 0;
2185
c7262e71
JH		 2186 if (sec_level > hcon->pending_sec_level)
2187 hcon->pending_sec_level = sec_level;
feb45eb5 2188
4dab7864 2189 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
988c5997
VCG		 2190 return 0;
2191
8aab4757 2192 smp = smp_chan_create(conn);
c29d2444
JH		 2193 if (!smp)
2194 return SMP_UNSPECIFIED;
d26a2345 2195
d7a5a11d 2196 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 2197 (auth & SMP_AUTH_BONDING))
616d55be
JH		 2198 return SMP_PAIRING_NOTSUPP;
2199
88ba43b6 2200 skb_pull(skb, sizeof(*rp));
88ba43b6 2201
da85e5e5 2202 memset(&cp, 0, sizeof(cp));
c05b9339 2203 build_pairing_cmd(conn, &cp, NULL, auth);
88ba43b6 2204
1c1def09
VCG		 2205 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2206 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2207
88ba43b6 2208 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2209 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
f1cb9af5 2210
da85e5e5 2211 return 0;
88ba43b6
AB		 2212}
2213
cc110922 2214int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
eb492e01 2215{
cc110922 2216 struct l2cap_conn *conn = hcon->l2cap_data;
c68b7f12 2217 struct l2cap_chan *chan;
0a66cf20 2218 struct smp_chan *smp;
2b64d153 2219 __u8 authreq;
fc75cc86 2220 int ret;
eb492e01 2221
3a0259bb
VCG		 2222 BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
2223
0a66cf20
JH		 2224 /* This may be NULL if there's an unexpected disconnection */
2225 if (!conn)
2226 return 1;
2227
c68b7f12
JH		 2228 chan = conn->smp;
2229
d7a5a11d 2230 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED))
2e65c9d2
AG		 2231 return 1;
2232
35dc6f83 2233 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
eb492e01 2234 return 1;
f1cb9af5 2235
c7262e71
JH		 2236 if (sec_level > hcon->pending_sec_level)
2237 hcon->pending_sec_level = sec_level;
2238
40bef302 2239 if (hcon->role == HCI_ROLE_MASTER)
c7262e71
JH		 2240 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
2241 return 0;
d26a2345 2242
fc75cc86
JH		 2243 l2cap_chan_lock(chan);
2244
2245 /* If SMP is already in progress ignore this request */
2246 if (chan->data) {
2247 ret = 0;
2248 goto unlock;
2249 }
d26a2345 2250
8aab4757 2251 smp = smp_chan_create(conn);
fc75cc86
JH		 2252 if (!smp) {
2253 ret = 1;
2254 goto unlock;
2255 }
2b64d153
BG		 2256
2257 authreq = seclevel_to_authreq(sec_level);
d26a2345 2258
d7a5a11d 2259 if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED))
d2eb9e10
JH		 2260 authreq |= SMP_AUTH_SC;
2261
79897d20
JH		 2262 /* Require MITM if IO Capability allows or the security level
2263 * requires it.
2e233644 2264 */
79897d20 2265 if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
c7262e71 2266 hcon->pending_sec_level > BT_SECURITY_MEDIUM)
2e233644
JH		 2267 authreq |= SMP_AUTH_MITM;
2268
40bef302 2269 if (hcon->role == HCI_ROLE_MASTER) {
d26a2345 2270 struct smp_cmd_pairing cp;
f01ead31 2271
2b64d153 2272 build_pairing_cmd(conn, &cp, NULL, authreq);
1c1def09
VCG		 2273 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2274 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2275
eb492e01 2276 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2277 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
eb492e01
AB		 2278 } else {
2279 struct smp_cmd_security_req cp;
2b64d153 2280 cp.auth_req = authreq;
eb492e01 2281 smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
b28b4943 2282 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ);
eb492e01
AB		 2283 }
2284
4a74d658 2285 set_bit(SMP_FLAG_INITIATOR, &smp->flags);
fc75cc86 2286 ret = 0;
edca792c 2287
fc75cc86
JH		 2288unlock:
2289 l2cap_chan_unlock(chan);
2290 return ret;
eb492e01
AB		 2291}
2292
7034b911
VCG		 2293static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
2294{
16b90839 2295 struct smp_cmd_encrypt_info *rp = (void *) skb->data;
5d88cc73
JH		 2296 struct l2cap_chan *chan = conn->smp;
2297 struct smp_chan *smp = chan->data;
16b90839 2298
c46b98be
JH		 2299 BT_DBG("conn %p", conn);
2300
2301 if (skb->len < sizeof(*rp))
38e4a915 2302 return SMP_INVALID_PARAMS;
c46b98be 2303
b28b4943 2304 SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT);
6131ddc8 2305
16b90839
VCG		 2306 skb_pull(skb, sizeof(*rp));
2307
1c1def09 2308 memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
16b90839 2309
7034b911
VCG		 2310 return 0;
2311}
2312
2313static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
2314{
16b90839 2315 struct smp_cmd_master_ident *rp = (void *) skb->data;
5d88cc73
JH		 2316 struct l2cap_chan *chan = conn->smp;
2317 struct smp_chan *smp = chan->data;
c9839a11
VCG		 2318 struct hci_dev *hdev = conn->hcon->hdev;
2319 struct hci_conn *hcon = conn->hcon;
23d0e128 2320 struct smp_ltk *ltk;
c9839a11 2321 u8 authenticated;
16b90839 2322
c46b98be
JH		 2323 BT_DBG("conn %p", conn);
2324
2325 if (skb->len < sizeof(*rp))
38e4a915 2326 return SMP_INVALID_PARAMS;
c46b98be 2327
9747a9f3
JH		 2328 /* Mark the information as received */
2329 smp->remote_key_dist &= ~SMP_DIST_ENC_KEY;
2330
b28b4943
JH		 2331 if (smp->remote_key_dist & SMP_DIST_ID_KEY)
2332 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
196332f5
JH		 2333 else if (smp->remote_key_dist & SMP_DIST_SIGN)
2334 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
b28b4943 2335
16b90839 2336 skb_pull(skb, sizeof(*rp));
7034b911 2337
ce39fb4e 2338 authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
2ceba539 2339 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
23d0e128
JH		 2340 authenticated, smp->tk, smp->enc_key_size,
2341 rp->ediv, rp->rand);
2342 smp->ltk = ltk;
c6e81e9a 2343 if (!(smp->remote_key_dist & KEY_DIST_MASK))
d6268e86 2344 smp_distribute_keys(smp);
7034b911
VCG		 2345
2346 return 0;
2347}
2348
fd349c02
JH		 2349static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
2350{
2351 struct smp_cmd_ident_info *info = (void *) skb->data;
5d88cc73
JH		 2352 struct l2cap_chan *chan = conn->smp;
2353 struct smp_chan *smp = chan->data;
fd349c02
JH		 2354
2355 BT_DBG("");
2356
2357 if (skb->len < sizeof(*info))
38e4a915 2358 return SMP_INVALID_PARAMS;
fd349c02 2359
b28b4943 2360 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO);
6131ddc8 2361
fd349c02
JH		 2362 skb_pull(skb, sizeof(*info));
2363
2364 memcpy(smp->irk, info->irk, 16);
2365
2366 return 0;
2367}
2368
2369static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
2370 struct sk_buff *skb)
2371{
2372 struct smp_cmd_ident_addr_info *info = (void *) skb->data;
5d88cc73
JH		 2373 struct l2cap_chan *chan = conn->smp;
2374 struct smp_chan *smp = chan->data;
fd349c02
JH		 2375 struct hci_conn *hcon = conn->hcon;
2376 bdaddr_t rpa;
2377
2378 BT_DBG("");
2379
2380 if (skb->len < sizeof(*info))
38e4a915 2381 return SMP_INVALID_PARAMS;
fd349c02 2382
9747a9f3
JH		 2383 /* Mark the information as received */
2384 smp->remote_key_dist &= ~SMP_DIST_ID_KEY;
2385
b28b4943
JH		 2386 if (smp->remote_key_dist & SMP_DIST_SIGN)
2387 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
2388
fd349c02
JH		 2389 skb_pull(skb, sizeof(*info));
2390
a9a58f86
JH		 2391 /* Strictly speaking the Core Specification (4.1) allows sending
2392 * an empty address which would force us to rely on just the IRK
2393 * as "identity information". However, since such
2394 * implementations are not known of and in order to not over
2395 * complicate our implementation, simply pretend that we never
2396 * received an IRK for such a device.
e12af489
JH		 2397 *
2398 * The Identity Address must also be a Static Random or Public
2399 * Address, which hci_is_identity_address() checks for.
a9a58f86 2400 */
e12af489
JH		 2401 if (!bacmp(&info->bdaddr, BDADDR_ANY) ||
2402 !hci_is_identity_address(&info->bdaddr, info->addr_type)) {
a9a58f86 2403 BT_ERR("Ignoring IRK with no identity address");
31dd624e 2404 goto distribute;
a9a58f86
JH		 2405 }
2406
fd349c02
JH		 2407 bacpy(&smp->id_addr, &info->bdaddr);
2408 smp->id_addr_type = info->addr_type;
2409
2410 if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type))
2411 bacpy(&rpa, &hcon->dst);
2412 else
2413 bacpy(&rpa, BDADDR_ANY);
2414
23d0e128
JH		 2415 smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr,
2416 smp->id_addr_type, smp->irk, &rpa);
fd349c02 2417
31dd624e 2418distribute:
c6e81e9a
JH		 2419 if (!(smp->remote_key_dist & KEY_DIST_MASK))
2420 smp_distribute_keys(smp);
fd349c02
JH		 2421
2422 return 0;
2423}
2424
7ee4ea36
MH		 2425static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
2426{
2427 struct smp_cmd_sign_info *rp = (void *) skb->data;
5d88cc73
JH		 2428 struct l2cap_chan *chan = conn->smp;
2429 struct smp_chan *smp = chan->data;
7ee4ea36
MH		 2430 struct smp_csrk *csrk;
2431
2432 BT_DBG("conn %p", conn);
2433
2434 if (skb->len < sizeof(*rp))
38e4a915 2435 return SMP_INVALID_PARAMS;
7ee4ea36 2436
7ee4ea36
MH		 2437 /* Mark the information as received */
2438 smp->remote_key_dist &= ~SMP_DIST_SIGN;
2439
2440 skb_pull(skb, sizeof(*rp));
2441
7ee4ea36
MH		 2442 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
2443 if (csrk) {
4cd3928a
JH		 2444 if (conn->hcon->sec_level > BT_SECURITY_MEDIUM)
2445 csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED;
2446 else
2447 csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED;
7ee4ea36
MH		 2448 memcpy(csrk->val, rp->csrk, sizeof(csrk->val));
2449 }
2450 smp->csrk = csrk;
d6268e86 2451 smp_distribute_keys(smp);
7ee4ea36
MH		 2452
2453 return 0;
2454}
2455
5e3d3d9b
JH		 2456static u8 sc_select_method(struct smp_chan *smp)
2457{
2458 struct l2cap_conn *conn = smp->conn;
2459 struct hci_conn *hcon = conn->hcon;
2460 struct smp_cmd_pairing *local, *remote;
2461 u8 local_mitm, remote_mitm, local_io, remote_io, method;
2462
1a8bab4f
JH		 2463 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) ||
2464 test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags))
a29b0733
JH		 2465 return REQ_OOB;
2466
5e3d3d9b
JH		 2467 /* The preq/prsp contain the raw Pairing Request/Response PDUs
2468 * which are needed as inputs to some crypto functions. To get
2469 * the "struct smp_cmd_pairing" from them we need to skip the
2470 * first byte which contains the opcode.
2471 */
2472 if (hcon->out) {
2473 local = (void *) &smp->preq[1];
2474 remote = (void *) &smp->prsp[1];
2475 } else {
2476 local = (void *) &smp->prsp[1];
2477 remote = (void *) &smp->preq[1];
2478 }
2479
2480 local_io = local->io_capability;
2481 remote_io = remote->io_capability;
2482
2483 local_mitm = (local->auth_req & SMP_AUTH_MITM);
2484 remote_mitm = (remote->auth_req & SMP_AUTH_MITM);
2485
2486 /* If either side wants MITM, look up the method from the table,
2487 * otherwise use JUST WORKS.
2488 */
2489 if (local_mitm || remote_mitm)
2490 method = get_auth_method(smp, local_io, remote_io);
2491 else
2492 method = JUST_WORKS;
2493
2494 /* Don't confirm locally initiated pairing attempts */
2495 if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
2496 method = JUST_WORKS;
2497
2498 return method;
2499}
2500
d8f8edbe
JH		 2501static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
2502{
2503 struct smp_cmd_public_key *key = (void *) skb->data;
2504 struct hci_conn *hcon = conn->hcon;
2505 struct l2cap_chan *chan = conn->smp;
2506 struct smp_chan *smp = chan->data;
5e3d3d9b 2507 struct hci_dev *hdev = hcon->hdev;
cbbbe3e2 2508 struct smp_cmd_pairing_confirm cfm;
d8f8edbe
JH		 2509 int err;
2510
2511 BT_DBG("conn %p", conn);
2512
2513 if (skb->len < sizeof(*key))
2514 return SMP_INVALID_PARAMS;
2515
2516 memcpy(smp->remote_pk, key, 64);
2517
a8ca617c
JH		 2518 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {
2519 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
2520 smp->rr, 0, cfm.confirm_val);
2521 if (err)
2522 return SMP_UNSPECIFIED;
2523
2524 if (memcmp(cfm.confirm_val, smp->pcnf, 16))
2525 return SMP_CONFIRM_FAILED;
2526 }
2527
d8f8edbe
JH		 2528 /* Non-initiating device sends its public key after receiving
2529 * the key from the initiating device.
2530 */
2531 if (!hcon->out) {
2532 err = sc_send_public_key(smp);
2533 if (err)
2534 return err;
2535 }
2536
c7a3d57d
JH		 2537 SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk);
2538 SMP_DBG("Remote Public Key Y: %32phN", &smp->remote_pk[32]);
d8f8edbe
JH		 2539
2540 if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey))
2541 return SMP_UNSPECIFIED;
2542
c7a3d57d 2543 SMP_DBG("DHKey %32phN", smp->dhkey);
d8f8edbe
JH		 2544
2545 set_bit(SMP_FLAG_REMOTE_PK, &smp->flags);
2546
5e3d3d9b
JH		 2547 smp->method = sc_select_method(smp);
2548
2549 BT_DBG("%s selected method 0x%02x", hdev->name, smp->method);
2550
2551 /* JUST_WORKS and JUST_CFM result in an unauthenticated key */
2552 if (smp->method == JUST_WORKS || smp->method == JUST_CFM)
2553 hcon->pending_sec_level = BT_SECURITY_MEDIUM;
2554 else
2555 hcon->pending_sec_level = BT_SECURITY_FIPS;
2556
aeb7d461
JH		 2557 if (!memcmp(debug_pk, smp->remote_pk, 64))
2558 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
2559
38606f14
JH		 2560 if (smp->method == DSP_PASSKEY) {
2561 get_random_bytes(&hcon->passkey_notify,
2562 sizeof(hcon->passkey_notify));
2563 hcon->passkey_notify %= 1000000;
2564 hcon->passkey_entered = 0;
2565 smp->passkey_round = 0;
2566 if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type,
2567 hcon->dst_type,
2568 hcon->passkey_notify,
2569 hcon->passkey_entered))
2570 return SMP_UNSPECIFIED;
2571 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2572 return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
2573 }
2574
94ea7257 2575 if (smp->method == REQ_OOB) {
a29b0733
JH		 2576 if (hcon->out)
2577 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2578 sizeof(smp->prnd), smp->prnd);
2579
2580 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2581
2582 return 0;
2583 }
2584
38606f14
JH		 2585 if (hcon->out)
2586 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2587
2588 if (smp->method == REQ_PASSKEY) {
2589 if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type,
2590 hcon->dst_type))
2591 return SMP_UNSPECIFIED;
2592 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2593 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2594 return 0;
2595 }
2596
cbbbe3e2
JH		 2597 /* The Initiating device waits for the non-initiating device to
2598 * send the confirm value.
2599 */
2600 if (conn->hcon->out)
2601 return 0;
2602
2603 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd,
2604 0, cfm.confirm_val);
2605 if (err)
2606 return SMP_UNSPECIFIED;
2607
2608 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
2609 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2610
d8f8edbe
JH		 2611 return 0;
2612}
2613
6433a9a2
JH		 2614static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb)
2615{
2616 struct smp_cmd_dhkey_check *check = (void *) skb->data;
2617 struct l2cap_chan *chan = conn->smp;
2618 struct hci_conn *hcon = conn->hcon;
2619 struct smp_chan *smp = chan->data;
2620 u8 a[7], b[7], *local_addr, *remote_addr;
2621 u8 io_cap[3], r[16], e[16];
2622 int err;
2623
2624 BT_DBG("conn %p", conn);
2625
2626 if (skb->len < sizeof(*check))
2627 return SMP_INVALID_PARAMS;
2628
2629 memcpy(a, &hcon->init_addr, 6);
2630 memcpy(b, &hcon->resp_addr, 6);
2631 a[6] = hcon->init_addr_type;
2632 b[6] = hcon->resp_addr_type;
2633
2634 if (hcon->out) {
2635 local_addr = a;
2636 remote_addr = b;
2637 memcpy(io_cap, &smp->prsp[1], 3);
2638 } else {
2639 local_addr = b;
2640 remote_addr = a;
2641 memcpy(io_cap, &smp->preq[1], 3);
2642 }
2643
2644 memset(r, 0, sizeof(r));
2645
38606f14
JH		 2646 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2647 put_unaligned_le32(hcon->passkey_notify, r);
882fafad
JH		 2648 else if (smp->method == REQ_OOB)
2649 memcpy(r, smp->lr, 16);
38606f14 2650
6433a9a2
JH		 2651 err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r,
2652 io_cap, remote_addr, local_addr, e);
2653 if (err)
2654 return SMP_UNSPECIFIED;
2655
2656 if (memcmp(check->e, e, 16))
2657 return SMP_DHKEY_CHECK_FAILED;
2658
d3e54a87
JH		 2659 if (!hcon->out) {
2660 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
2661 set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags);
2662 return 0;
2663 }
d378a2d7 2664
d3e54a87
JH		 2665 /* Slave sends DHKey check as response to master */
2666 sc_dhkey_check(smp);
2667 }
d378a2d7 2668
d3e54a87 2669 sc_add_ltk(smp);
6433a9a2
JH		 2670
2671 if (hcon->out) {
2672 hci_le_start_enc(hcon, 0, 0, smp->tk);
2673 hcon->enc_key_size = smp->enc_key_size;
2674 }
2675
2676 return 0;
2677}
2678
1408bb6e
JH		 2679static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
2680 struct sk_buff *skb)
2681{
2682 struct smp_cmd_keypress_notify *kp = (void *) skb->data;
2683
2684 BT_DBG("value 0x%02x", kp->value);
2685
2686 return 0;
2687}
2688
4befb867 2689static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
eb492e01 2690{
5d88cc73 2691 struct l2cap_conn *conn = chan->conn;
7b9899db 2692 struct hci_conn *hcon = conn->hcon;
b28b4943 2693 struct smp_chan *smp;
92381f5c 2694 __u8 code, reason;
eb492e01
AB		 2695 int err = 0;
2696
8ae9b984 2697 if (skb->len < 1)
92381f5c 2698 return -EILSEQ;
92381f5c 2699
d7a5a11d 2700 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) {
2e65c9d2
AG		 2701 reason = SMP_PAIRING_NOTSUPP;
2702 goto done;
2703 }
2704
92381f5c 2705 code = skb->data[0];
eb492e01
AB		 2706 skb_pull(skb, sizeof(code));
2707
b28b4943
JH		 2708 smp = chan->data;
2709
2710 if (code > SMP_CMD_MAX)
2711 goto drop;
2712
24bd0bd9 2713 if (smp && !test_and_clear_bit(code, &smp->allow_cmd))
b28b4943
JH		 2714 goto drop;
2715
2716 /* If we don't have a context the only allowed commands are
2717 * pairing request and security request.
8cf9fa12 2718 */
b28b4943
JH		 2719 if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ)
2720 goto drop;
8cf9fa12 2721
eb492e01
AB		 2722 switch (code) {
2723 case SMP_CMD_PAIRING_REQ:
da85e5e5 2724 reason = smp_cmd_pairing_req(conn, skb);
eb492e01
AB		 2725 break;
2726
2727 case SMP_CMD_PAIRING_FAIL:
84794e11 2728 smp_failure(conn, 0);
da85e5e5 2729 err = -EPERM;
eb492e01
AB		 2730 break;
2731
2732 case SMP_CMD_PAIRING_RSP:
da85e5e5 2733 reason = smp_cmd_pairing_rsp(conn, skb);
88ba43b6
AB		 2734 break;
2735
2736 case SMP_CMD_SECURITY_REQ:
da85e5e5 2737 reason = smp_cmd_security_req(conn, skb);
88ba43b6
AB		 2738 break;
2739
eb492e01 2740 case SMP_CMD_PAIRING_CONFIRM:
da85e5e5 2741 reason = smp_cmd_pairing_confirm(conn, skb);
88ba43b6
AB		 2742 break;
2743
eb492e01 2744 case SMP_CMD_PAIRING_RANDOM:
da85e5e5 2745 reason = smp_cmd_pairing_random(conn, skb);
88ba43b6
AB		 2746 break;
2747
eb492e01 2748 case SMP_CMD_ENCRYPT_INFO:
7034b911
VCG		 2749 reason = smp_cmd_encrypt_info(conn, skb);
2750 break;
2751
eb492e01 2752 case SMP_CMD_MASTER_IDENT:
7034b911
VCG		 2753 reason = smp_cmd_master_ident(conn, skb);
2754 break;
2755
eb492e01 2756 case SMP_CMD_IDENT_INFO:
fd349c02
JH		 2757 reason = smp_cmd_ident_info(conn, skb);
2758 break;
2759
eb492e01 2760 case SMP_CMD_IDENT_ADDR_INFO:
fd349c02
JH		 2761 reason = smp_cmd_ident_addr_info(conn, skb);
2762 break;
2763
eb492e01 2764 case SMP_CMD_SIGN_INFO:
7ee4ea36 2765 reason = smp_cmd_sign_info(conn, skb);
7034b911
VCG		 2766 break;
2767
d8f8edbe
JH		 2768 case SMP_CMD_PUBLIC_KEY:
2769 reason = smp_cmd_public_key(conn, skb);
2770 break;
2771
6433a9a2
JH		 2772 case SMP_CMD_DHKEY_CHECK:
2773 reason = smp_cmd_dhkey_check(conn, skb);
2774 break;
2775
1408bb6e
JH		 2776 case SMP_CMD_KEYPRESS_NOTIFY:
2777 reason = smp_cmd_keypress_notify(conn, skb);
2778 break;
2779
eb492e01
AB		 2780 default:
2781 BT_DBG("Unknown command code 0x%2.2x", code);
eb492e01 2782 reason = SMP_CMD_NOTSUPP;
3a0259bb 2783 goto done;
eb492e01
AB		 2784 }
2785
3a0259bb 2786done:
9b7b18ef
JH		 2787 if (!err) {
2788 if (reason)
2789 smp_failure(conn, reason);
8ae9b984 2790 kfree_skb(skb);
9b7b18ef
JH		 2791 }
2792
eb492e01 2793 return err;
b28b4943
JH		 2794
2795drop:
2796 BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name,
2797 code, &hcon->dst);
2798 kfree_skb(skb);
2799 return 0;
eb492e01 2800}
7034b911 2801
70db83c4
JH		 2802static void smp_teardown_cb(struct l2cap_chan *chan, int err)
2803{
2804 struct l2cap_conn *conn = chan->conn;
2805
2806 BT_DBG("chan %p", chan);
2807
fc75cc86 2808 if (chan->data)
5d88cc73 2809 smp_chan_destroy(conn);
5d88cc73 2810
70db83c4
JH		 2811 conn->smp = NULL;
2812 l2cap_chan_put(chan);
2813}
2814
b5ae344d
JH		 2815static void bredr_pairing(struct l2cap_chan *chan)
2816{
2817 struct l2cap_conn *conn = chan->conn;
2818 struct hci_conn *hcon = conn->hcon;
2819 struct hci_dev *hdev = hcon->hdev;
2820 struct smp_cmd_pairing req;
2821 struct smp_chan *smp;
2822
2823 BT_DBG("chan %p", chan);
2824
2825 /* Only new pairings are interesting */
2826 if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags))
2827 return;
2828
2829 /* Don't bother if we're not encrypted */
2830 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
2831 return;
2832
2833 /* Only master may initiate SMP over BR/EDR */
2834 if (hcon->role != HCI_ROLE_MASTER)
2835 return;
2836
2837 /* Secure Connections support must be enabled */
d7a5a11d 2838 if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED))
b5ae344d
JH		 2839 return;
2840
2841 /* BR/EDR must use Secure Connections for SMP */
2842 if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) &&
b7cb93e5 2843 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 2844 return;
2845
2846 /* If our LE support is not enabled don't do anything */
d7a5a11d 2847 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
b5ae344d
JH		 2848 return;
2849
2850 /* Don't bother if remote LE support is not enabled */
2851 if (!lmp_host_le_capable(hcon))
2852 return;
2853
2854 /* Remote must support SMP fixed chan for BR/EDR */
2855 if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR))
2856 return;
2857
2858 /* Don't bother if SMP is already ongoing */
2859 if (chan->data)
2860 return;
2861
2862 smp = smp_chan_create(conn);
2863 if (!smp) {
2864 BT_ERR("%s unable to create SMP context for BR/EDR",
2865 hdev->name);
2866 return;
2867 }
2868
2869 set_bit(SMP_FLAG_SC, &smp->flags);
2870
2871 BT_DBG("%s starting SMP over BR/EDR", hdev->name);
2872
2873 /* Prepare and send the BR/EDR SMP Pairing Request */
2874 build_bredr_pairing_cmd(smp, &req, NULL);
2875
2876 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2877 memcpy(&smp->preq[1], &req, sizeof(req));
2878
2879 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req);
2880 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
2881}
2882
44f1a7ab
JH		 2883static void smp_resume_cb(struct l2cap_chan *chan)
2884{
b68fda68 2885 struct smp_chan *smp = chan->data;
44f1a7ab
JH		 2886 struct l2cap_conn *conn = chan->conn;
2887 struct hci_conn *hcon = conn->hcon;
2888
2889 BT_DBG("chan %p", chan);
2890
b5ae344d
JH		 2891 if (hcon->type == ACL_LINK) {
2892 bredr_pairing(chan);
ef8efe4b 2893 return;
b5ae344d 2894 }
ef8efe4b 2895
86d1407c
JH		 2896 if (!smp)
2897 return;
b68fda68 2898
84bc0db5
JH		 2899 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
2900 return;
2901
86d1407c
JH		 2902 cancel_delayed_work(&smp->security_timer);
2903
d6268e86 2904 smp_distribute_keys(smp);
44f1a7ab
JH		 2905}
2906
70db83c4
JH		 2907static void smp_ready_cb(struct l2cap_chan *chan)
2908{
2909 struct l2cap_conn *conn = chan->conn;
b5ae344d 2910 struct hci_conn *hcon = conn->hcon;
70db83c4
JH		 2911
2912 BT_DBG("chan %p", chan);
2913
2914 conn->smp = chan;
2915 l2cap_chan_hold(chan);
b5ae344d
JH		 2916
2917 if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
2918 bredr_pairing(chan);
70db83c4
JH		 2919}
2920
4befb867
JH		 2921static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
2922{
2923 int err;
2924
2925 BT_DBG("chan %p", chan);
2926
2927 err = smp_sig_channel(chan, skb);
2928 if (err) {
b68fda68 2929 struct smp_chan *smp = chan->data;
4befb867 2930
b68fda68
JH		 2931 if (smp)
2932 cancel_delayed_work_sync(&smp->security_timer);
4befb867 2933
1e91c29e 2934 hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);
4befb867
JH		 2935 }
2936
2937 return err;
2938}
2939
70db83c4
JH		 2940static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan,
2941 unsigned long hdr_len,
2942 unsigned long len, int nb)
2943{
2944 struct sk_buff *skb;
2945
2946 skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
2947 if (!skb)
2948 return ERR_PTR(-ENOMEM);
2949
2950 skb->priority = HCI_PRIO_MAX;
2951 bt_cb(skb)->chan = chan;
2952
2953 return skb;
2954}
2955
2956static const struct l2cap_ops smp_chan_ops = {
2957 .name = "Security Manager",
2958 .ready = smp_ready_cb,
5d88cc73 2959 .recv = smp_recv_cb,
70db83c4
JH		 2960 .alloc_skb = smp_alloc_skb_cb,
2961 .teardown = smp_teardown_cb,
44f1a7ab 2962 .resume = smp_resume_cb,
70db83c4
JH		 2963
2964 .new_connection = l2cap_chan_no_new_connection,
70db83c4
JH		 2965 .state_change = l2cap_chan_no_state_change,
2966 .close = l2cap_chan_no_close,
2967 .defer = l2cap_chan_no_defer,
2968 .suspend = l2cap_chan_no_suspend,
70db83c4
JH		 2969 .set_shutdown = l2cap_chan_no_set_shutdown,
2970 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 2971};
2972
2973static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan)
2974{
2975 struct l2cap_chan *chan;
2976
2977 BT_DBG("pchan %p", pchan);
2978
2979 chan = l2cap_chan_create();
2980 if (!chan)
2981 return NULL;
2982
2983 chan->chan_type = pchan->chan_type;
2984 chan->ops = &smp_chan_ops;
2985 chan->scid = pchan->scid;
2986 chan->dcid = chan->scid;
2987 chan->imtu = pchan->imtu;
2988 chan->omtu = pchan->omtu;
2989 chan->mode = pchan->mode;
2990
abe84903
JH		 2991 /* Other L2CAP channels may request SMP routines in order to
2992 * change the security level. This means that the SMP channel
2993 * lock must be considered in its own category to avoid lockdep
2994 * warnings.
2995 */
2996 atomic_set(&chan->nesting, L2CAP_NESTING_SMP);
2997
70db83c4
JH		 2998 BT_DBG("created chan %p", chan);
2999
3000 return chan;
3001}
3002
3003static const struct l2cap_ops smp_root_chan_ops = {
3004 .name = "Security Manager Root",
3005 .new_connection = smp_new_conn_cb,
3006
3007 /* None of these are implemented for the root channel */
3008 .close = l2cap_chan_no_close,
3009 .alloc_skb = l2cap_chan_no_alloc_skb,
3010 .recv = l2cap_chan_no_recv,
3011 .state_change = l2cap_chan_no_state_change,
3012 .teardown = l2cap_chan_no_teardown,
3013 .ready = l2cap_chan_no_ready,
3014 .defer = l2cap_chan_no_defer,
3015 .suspend = l2cap_chan_no_suspend,
3016 .resume = l2cap_chan_no_resume,
3017 .set_shutdown = l2cap_chan_no_set_shutdown,
3018 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3019};
3020
ef8efe4b 3021static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
711eafe3 3022{
70db83c4 3023 struct l2cap_chan *chan;
88a479d9
MH		 3024 struct smp_dev *smp;
3025 struct crypto_blkcipher *tfm_aes;
6e2dc6d1 3026 struct crypto_hash *tfm_cmac;
70db83c4 3027
ef8efe4b 3028 if (cid == L2CAP_CID_SMP_BREDR) {
88a479d9 3029 smp = NULL;
ef8efe4b
JH		 3030 goto create_chan;
3031 }
711eafe3 3032
88a479d9
MH		 3033 smp = kzalloc(sizeof(*smp), GFP_KERNEL);
3034 if (!smp)
3035 return ERR_PTR(-ENOMEM);
3036
3037 tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
defce9e8 3038 if (IS_ERR(tfm_aes)) {
88a479d9
MH		 3039 BT_ERR("Unable to create ECB crypto context");
3040 kzfree(smp);
fe700771 3041 return ERR_CAST(tfm_aes);
711eafe3
JH		 3042 }
3043
6e2dc6d1
MH		 3044 tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC);
3045 if (IS_ERR(tfm_cmac)) {
3046 BT_ERR("Unable to create CMAC crypto context");
3047 crypto_free_blkcipher(tfm_aes);
3048 kzfree(smp);
3049 return ERR_CAST(tfm_cmac);
3050 }
3051
88a479d9 3052 smp->tfm_aes = tfm_aes;
6e2dc6d1 3053 smp->tfm_cmac = tfm_cmac;
88a479d9 3054
ef8efe4b 3055create_chan:
70db83c4
JH		 3056 chan = l2cap_chan_create();
3057 if (!chan) {
88a479d9 3058 crypto_free_blkcipher(smp->tfm_aes);
6e2dc6d1 3059 crypto_free_hash(smp->tfm_cmac);
88a479d9 3060 kzfree(smp);
ef8efe4b 3061 return ERR_PTR(-ENOMEM);
70db83c4
JH		 3062 }
3063
88a479d9 3064 chan->data = smp;
defce9e8 3065
ef8efe4b 3066 l2cap_add_scid(chan, cid);
70db83c4
JH		 3067
3068 l2cap_chan_set_defaults(chan);
3069
157029ba 3070 if (cid == L2CAP_CID_SMP) {
39e3e744
JH		 3071 u8 bdaddr_type;
3072
3073 hci_copy_identity_address(hdev, &chan->src, &bdaddr_type);
3074
3075 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
157029ba 3076 chan->src_type = BDADDR_LE_PUBLIC;
39e3e744
JH		 3077 else
3078 chan->src_type = BDADDR_LE_RANDOM;
157029ba
MH		 3079 } else {
3080 bacpy(&chan->src, &hdev->bdaddr);
ef8efe4b 3081 chan->src_type = BDADDR_BREDR;
157029ba
MH		 3082 }
3083
70db83c4
JH		 3084 chan->state = BT_LISTEN;
3085 chan->mode = L2CAP_MODE_BASIC;
3086 chan->imtu = L2CAP_DEFAULT_MTU;
3087 chan->ops = &smp_root_chan_ops;
3088
abe84903
JH		 3089 /* Set correct nesting level for a parent/listening channel */
3090 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
3091
ef8efe4b 3092 return chan;
711eafe3
JH		 3093}
3094
ef8efe4b 3095static void smp_del_chan(struct l2cap_chan *chan)
711eafe3 3096{
88a479d9 3097 struct smp_dev *smp;
70db83c4 3098
ef8efe4b 3099 BT_DBG("chan %p", chan);
711eafe3 3100
88a479d9
MH		 3101 smp = chan->data;
3102 if (smp) {
defce9e8 3103 chan->data = NULL;
88a479d9
MH		 3104 if (smp->tfm_aes)
3105 crypto_free_blkcipher(smp->tfm_aes);
6e2dc6d1
MH		 3106 if (smp->tfm_cmac)
3107 crypto_free_hash(smp->tfm_cmac);
88a479d9 3108 kzfree(smp);
711eafe3 3109 }
70db83c4 3110
70db83c4 3111 l2cap_chan_put(chan);
711eafe3 3112}
ef8efe4b 3113
300acfde
MH		 3114static ssize_t force_bredr_smp_read(struct file *file,
3115 char __user *user_buf,
3116 size_t count, loff_t *ppos)
3117{
3118 struct hci_dev *hdev = file->private_data;
3119 char buf[3];
3120
b7cb93e5 3121 buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N';
300acfde
MH		 3122 buf[1] = '\n';
3123 buf[2] = '\0';
3124 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
3125}
3126
3127static ssize_t force_bredr_smp_write(struct file *file,
3128 const char __user *user_buf,
3129 size_t count, loff_t *ppos)
3130{
3131 struct hci_dev *hdev = file->private_data;
3132 char buf[32];
3133 size_t buf_size = min(count, (sizeof(buf)-1));
3134 bool enable;
3135
3136 if (copy_from_user(buf, user_buf, buf_size))
3137 return -EFAULT;
3138
3139 buf[buf_size] = '\0';
3140 if (strtobool(buf, &enable))
3141 return -EINVAL;
3142
b7cb93e5 3143 if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
300acfde
MH		 3144 return -EALREADY;
3145
3146 if (enable) {
3147 struct l2cap_chan *chan;
3148
3149 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3150 if (IS_ERR(chan))
3151 return PTR_ERR(chan);
3152
3153 hdev->smp_bredr_data = chan;
3154 } else {
3155 struct l2cap_chan *chan;
3156
3157 chan = hdev->smp_bredr_data;
3158 hdev->smp_bredr_data = NULL;
3159 smp_del_chan(chan);
3160 }
3161
b7cb93e5 3162 hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
300acfde
MH		 3163
3164 return count;
3165}
3166
3167static const struct file_operations force_bredr_smp_fops = {
3168 .open = simple_open,
3169 .read = force_bredr_smp_read,
3170 .write = force_bredr_smp_write,
3171 .llseek = default_llseek,
3172};
3173
ef8efe4b
JH		 3174int smp_register(struct hci_dev *hdev)
3175{
3176 struct l2cap_chan *chan;
3177
3178 BT_DBG("%s", hdev->name);
3179
7e7ec445
MH		 3180 /* If the controller does not support Low Energy operation, then
3181 * there is also no need to register any SMP channel.
3182 */
3183 if (!lmp_le_capable(hdev))
3184 return 0;
3185
2b8df323
MH		 3186 if (WARN_ON(hdev->smp_data)) {
3187 chan = hdev->smp_data;
3188 hdev->smp_data = NULL;
3189 smp_del_chan(chan);
3190 }
3191
ef8efe4b
JH		 3192 chan = smp_add_cid(hdev, L2CAP_CID_SMP);
3193 if (IS_ERR(chan))
3194 return PTR_ERR(chan);
3195
3196 hdev->smp_data = chan;
3197
300acfde
MH		 3198 /* If the controller does not support BR/EDR Secure Connections
3199 * feature, then the BR/EDR SMP channel shall not be present.
3200 *
3201 * To test this with Bluetooth 4.0 controllers, create a debugfs
3202 * switch that allows forcing BR/EDR SMP support and accepting
3203 * cross-transport pairing on non-AES encrypted connections.
3204 */
3205 if (!lmp_sc_capable(hdev)) {
3206 debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs,
3207 hdev, &force_bredr_smp_fops);
ef8efe4b 3208 return 0;
300acfde 3209 }
ef8efe4b 3210
2b8df323
MH		 3211 if (WARN_ON(hdev->smp_bredr_data)) {
3212 chan = hdev->smp_bredr_data;
3213 hdev->smp_bredr_data = NULL;
3214 smp_del_chan(chan);
3215 }
3216
ef8efe4b
JH		 3217 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3218 if (IS_ERR(chan)) {
3219 int err = PTR_ERR(chan);
3220 chan = hdev->smp_data;
3221 hdev->smp_data = NULL;
3222 smp_del_chan(chan);
3223 return err;
3224 }
3225
3226 hdev->smp_bredr_data = chan;
3227
3228 return 0;
3229}
3230
3231void smp_unregister(struct hci_dev *hdev)
3232{
3233 struct l2cap_chan *chan;
3234
3235 if (hdev->smp_bredr_data) {
3236 chan = hdev->smp_bredr_data;
3237 hdev->smp_bredr_data = NULL;
3238 smp_del_chan(chan);
3239 }
3240
3241 if (hdev->smp_data) {
3242 chan = hdev->smp_data;
3243 hdev->smp_data = NULL;
3244 smp_del_chan(chan);
3245 }
3246}
0a2b0f04
JH		 3247
3248#if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
3249
cfc4198e
JH		 3250static int __init test_ah(struct crypto_blkcipher *tfm_aes)
3251{
3252 const u8 irk[16] = {
3253 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3254 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3255 const u8 r[3] = { 0x94, 0x81, 0x70 };
3256 const u8 exp[3] = { 0xaa, 0xfb, 0x0d };
3257 u8 res[3];
3258 int err;
3259
3260 err = smp_ah(tfm_aes, irk, r, res);
3261 if (err)
3262 return err;
3263
3264 if (memcmp(res, exp, 3))
3265 return -EINVAL;
3266
3267 return 0;
3268}
3269
3270static int __init test_c1(struct crypto_blkcipher *tfm_aes)
3271{
3272 const u8 k[16] = {
3273 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3274 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3275 const u8 r[16] = {
3276 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63,
3277 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 };
3278 const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 };
3279 const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 };
3280 const u8 _iat = 0x01;
3281 const u8 _rat = 0x00;
3282 const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } };
3283 const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } };
3284 const u8 exp[16] = {
3285 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2,
3286 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e };
3287 u8 res[16];
3288 int err;
3289
3290 err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res);
3291 if (err)
3292 return err;
3293
3294 if (memcmp(res, exp, 16))
3295 return -EINVAL;
3296
3297 return 0;
3298}
3299
3300static int __init test_s1(struct crypto_blkcipher *tfm_aes)
3301{
3302 const u8 k[16] = {
3303 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3304 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3305 const u8 r1[16] = {
3306 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 };
3307 const u8 r2[16] = {
3308 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 };
3309 const u8 exp[16] = {
3310 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b,
3311 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a };
3312 u8 res[16];
3313 int err;
3314
3315 err = smp_s1(tfm_aes, k, r1, r2, res);
3316 if (err)
3317 return err;
3318
3319 if (memcmp(res, exp, 16))
3320 return -EINVAL;
3321
3322 return 0;
3323}
3324
fb2969a3
JH		 3325static int __init test_f4(struct crypto_hash *tfm_cmac)
3326{
3327 const u8 u[32] = {
3328 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3329 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3330 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3331 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3332 const u8 v[32] = {
3333 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3334 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3335 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3336 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3337 const u8 x[16] = {
3338 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3339 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3340 const u8 z = 0x00;
3341 const u8 exp[16] = {
3342 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1,
3343 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 };
3344 u8 res[16];
3345 int err;
3346
3347 err = smp_f4(tfm_cmac, u, v, x, z, res);
3348 if (err)
3349 return err;
3350
3351 if (memcmp(res, exp, 16))
3352 return -EINVAL;
3353
3354 return 0;
3355}
3356
3357static int __init test_f5(struct crypto_hash *tfm_cmac)
3358{
3359 const u8 w[32] = {
3360 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86,
3361 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99,
3362 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3363 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3364 const u8 n1[16] = {
3365 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3366 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3367 const u8 n2[16] = {
3368 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3369 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3370 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3371 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3372 const u8 exp_ltk[16] = {
3373 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98,
3374 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 };
3375 const u8 exp_mackey[16] = {
3376 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3377 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3378 u8 mackey[16], ltk[16];
3379 int err;
3380
3381 err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk);
3382 if (err)
3383 return err;
3384
3385 if (memcmp(mackey, exp_mackey, 16))
3386 return -EINVAL;
3387
3388 if (memcmp(ltk, exp_ltk, 16))
3389 return -EINVAL;
3390
3391 return 0;
3392}
3393
3394static int __init test_f6(struct crypto_hash *tfm_cmac)
3395{
3396 const u8 w[16] = {
3397 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3398 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3399 const u8 n1[16] = {
3400 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3401 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3402 const u8 n2[16] = {
3403 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3404 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3405 const u8 r[16] = {
3406 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08,
3407 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 };
3408 const u8 io_cap[3] = { 0x02, 0x01, 0x01 };
3409 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3410 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3411 const u8 exp[16] = {
3412 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2,
3413 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 };
3414 u8 res[16];
3415 int err;
3416
3417 err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res);
3418 if (err)
3419 return err;
3420
3421 if (memcmp(res, exp, 16))
3422 return -EINVAL;
3423
3424 return 0;
3425}
3426
3427static int __init test_g2(struct crypto_hash *tfm_cmac)
3428{
3429 const u8 u[32] = {
3430 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3431 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3432 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3433 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3434 const u8 v[32] = {
3435 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3436 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3437 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3438 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3439 const u8 x[16] = {
3440 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3441 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3442 const u8 y[16] = {
3443 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3444 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3445 const u32 exp_val = 0x2f9ed5ba % 1000000;
3446 u32 val;
3447 int err;
3448
3449 err = smp_g2(tfm_cmac, u, v, x, y, &val);
3450 if (err)
3451 return err;
3452
3453 if (val != exp_val)
3454 return -EINVAL;
3455
3456 return 0;
3457}
3458
3459static int __init test_h6(struct crypto_hash *tfm_cmac)
3460{
3461 const u8 w[16] = {
3462 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3463 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3464 const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c };
3465 const u8 exp[16] = {
3466 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8,
3467 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d };
3468 u8 res[16];
3469 int err;
3470
3471 err = smp_h6(tfm_cmac, w, key_id, res);
3472 if (err)
3473 return err;
3474
3475 if (memcmp(res, exp, 16))
3476 return -EINVAL;
3477
3478 return 0;
3479}
3480
0a2b0f04
JH		 3481static int __init run_selftests(struct crypto_blkcipher *tfm_aes,
3482 struct crypto_hash *tfm_cmac)
3483{
255047b0
MH		 3484 ktime_t calltime, delta, rettime;
3485 unsigned long long duration;
cfc4198e
JH		 3486 int err;
3487
255047b0
MH		 3488 calltime = ktime_get();
3489
cfc4198e
JH		 3490 err = test_ah(tfm_aes);
3491 if (err) {
3492 BT_ERR("smp_ah test failed");
3493 return err;
3494 }
3495
3496 err = test_c1(tfm_aes);
3497 if (err) {
3498 BT_ERR("smp_c1 test failed");
3499 return err;
3500 }
3501
3502 err = test_s1(tfm_aes);
3503 if (err) {
3504 BT_ERR("smp_s1 test failed");
3505 return err;
3506 }
3507
fb2969a3
JH		 3508 err = test_f4(tfm_cmac);
3509 if (err) {
3510 BT_ERR("smp_f4 test failed");
3511 return err;
3512 }
3513
3514 err = test_f5(tfm_cmac);
3515 if (err) {
3516 BT_ERR("smp_f5 test failed");
3517 return err;
3518 }
3519
3520 err = test_f6(tfm_cmac);
3521 if (err) {
3522 BT_ERR("smp_f6 test failed");
3523 return err;
3524 }
3525
3526 err = test_g2(tfm_cmac);
3527 if (err) {
3528 BT_ERR("smp_g2 test failed");
3529 return err;
3530 }
3531
3532 err = test_h6(tfm_cmac);
3533 if (err) {
3534 BT_ERR("smp_h6 test failed");
3535 return err;
3536 }
3537
255047b0
MH		 3538 rettime = ktime_get();
3539 delta = ktime_sub(rettime, calltime);
3540 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
3541
5ced2464 3542 BT_INFO("SMP test passed in %llu usecs", duration);
0a2b0f04
JH		 3543
3544 return 0;
3545}
3546
3547int __init bt_selftest_smp(void)
3548{
3549 struct crypto_blkcipher *tfm_aes;
3550 struct crypto_hash *tfm_cmac;
3551 int err;
3552
3553 tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
3554 if (IS_ERR(tfm_aes)) {
3555 BT_ERR("Unable to create ECB crypto context");
3556 return PTR_ERR(tfm_aes);
3557 }
3558
3559 tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC);
3560 if (IS_ERR(tfm_cmac)) {
3561 BT_ERR("Unable to create CMAC crypto context");
3562 crypto_free_blkcipher(tfm_aes);
3563 return PTR_ERR(tfm_cmac);
3564 }
3565
3566 err = run_selftests(tfm_aes, tfm_cmac);
3567
3568 crypto_free_hash(tfm_cmac);
3569 crypto_free_blkcipher(tfm_aes);
3570
3571 return err;
3572}
3573
3574#endif
Linux kernel - Deliverables
This page took 0.443833 seconds and 5 git commands to generate.