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Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux-block.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 24#include <linux/scatterlist.h>
a4770e11 25#include <linux/crypto.h>
28a220aa 26#include <crypto/aes.h>
329d8230 27#include <crypto/algapi.h>
71af2f6b 28#include <crypto/hash.h>
47eb2ac8 29#include <crypto/kpp.h>
8c520a59 30
eb492e01
AB		 31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33#include <net/bluetooth/l2cap.h>
2b64d153 34#include <net/bluetooth/mgmt.h>
ac4b7236 35
58771c1c 36#include "ecdh_helper.h"
ac4b7236 37#include "smp.h"
d22ef0bc 38
2fd36558
JH		 39#define SMP_DEV(hdev) \
40 ((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data)
41
c7a3d57d 42/* Low-level debug macros to be used for stuff that we don't want
91641b79 43 * accidentally in dmesg, i.e. the values of the various crypto keys
c7a3d57d
JH		 44 * and the inputs & outputs of crypto functions.
45 */
46#ifdef DEBUG
47#define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \
48 ##__VA_ARGS__)
49#else
50#define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \
51 ##__VA_ARGS__)
52#endif
53
b28b4943 54#define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd)
b28b4943 55
3b19146d 56/* Keys which are not distributed with Secure Connections */
c29fb5f6 57#define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY)
3b19146d 58
17b02e62 59#define SMP_TIMEOUT msecs_to_jiffies(30000)
5d3de7df 60
d7a5a11d 61#define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \
a62da6f1 62 0x3f : 0x07)
0edb14de 63#define KEY_DIST_MASK 0x07
065a13e2 64
cbbbe3e2
JH		 65/* Maximum message length that can be passed to aes_cmac */
66#define CMAC_MSG_MAX 80
67
533e35d4
JH		 68enum {
69 SMP_FLAG_TK_VALID,
70 SMP_FLAG_CFM_PENDING,
71 SMP_FLAG_MITM_AUTH,
72 SMP_FLAG_COMPLETE,
73 SMP_FLAG_INITIATOR,
65668776 74 SMP_FLAG_SC,
d8f8edbe 75 SMP_FLAG_REMOTE_PK,
aeb7d461 76 SMP_FLAG_DEBUG_KEY,
38606f14 77 SMP_FLAG_WAIT_USER,
d3e54a87 78 SMP_FLAG_DHKEY_PENDING,
1a8bab4f
JH		 79 SMP_FLAG_REMOTE_OOB,
80 SMP_FLAG_LOCAL_OOB,
a62da6f1 81 SMP_FLAG_CT2,
533e35d4 82};
4bc58f51 83
88a479d9 84struct smp_dev {
60a27d65 85 /* Secure Connections OOB data */
94f14e47 86 bool local_oob;
60a27d65 87 u8 local_pk[64];
fb334fee 88 u8 local_rand[16];
60a27d65
MH		 89 bool debug_key;
90
71af2f6b 91 struct crypto_shash *tfm_cmac;
47eb2ac8 92 struct crypto_kpp *tfm_ecdh;
88a479d9
MH		 93};
94
4bc58f51 95struct smp_chan {
b68fda68
JH		 96 struct l2cap_conn *conn;
97 struct delayed_work security_timer;
b28b4943 98 unsigned long allow_cmd; /* Bitmask of allowed commands */
b68fda68 99
4bc58f51
JH		 100 u8 preq[7]; /* SMP Pairing Request */
101 u8 prsp[7]; /* SMP Pairing Response */
102 u8 prnd[16]; /* SMP Pairing Random (local) */
103 u8 rrnd[16]; /* SMP Pairing Random (remote) */
104 u8 pcnf[16]; /* SMP Pairing Confirm */
105 u8 tk[16]; /* SMP Temporary Key */
882fafad
JH		 106 u8 rr[16]; /* Remote OOB ra/rb value */
107 u8 lr[16]; /* Local OOB ra/rb value */
4bc58f51
JH		 108 u8 enc_key_size;
109 u8 remote_key_dist;
110 bdaddr_t id_addr;
111 u8 id_addr_type;
112 u8 irk[16];
113 struct smp_csrk *csrk;
fad646e1 114 struct smp_csrk *responder_csrk;
4bc58f51 115 struct smp_ltk *ltk;
fad646e1 116 struct smp_ltk *responder_ltk;
4bc58f51 117 struct smp_irk *remote_irk;
6a77083a 118 u8 *link_key;
4a74d658 119 unsigned long flags;
783e0574 120 u8 method;
38606f14 121 u8 passkey_round;
6a7bd103 122
3b19146d
JH		 123 /* Secure Connections variables */
124 u8 local_pk[64];
d8f8edbe
JH		 125 u8 remote_pk[64];
126 u8 dhkey[32];
760b018b 127 u8 mackey[16];
3b19146d 128
71af2f6b 129 struct crypto_shash *tfm_cmac;
47eb2ac8 130 struct crypto_kpp *tfm_ecdh;
4bc58f51
JH		 131};
132
aeb7d461
JH		 133/* These debug key values are defined in the SMP section of the core
134 * specification. debug_pk is the public debug key and debug_sk the
135 * private debug key.
136 */
137static const u8 debug_pk[64] = {
138 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
139 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
140 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
141 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20,
142
143 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74,
144 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76,
145 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63,
146 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc,
147};
148
149static const u8 debug_sk[32] = {
150 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58,
151 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a,
152 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74,
153 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f,
154};
155
8a2936f4 156static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
d22ef0bc 157{
8a2936f4 158 size_t i;
d22ef0bc 159
8a2936f4
JH		 160 for (i = 0; i < len; i++)
161 dst[len - 1 - i] = src[i];
d22ef0bc
AB		 162}
163
06edf8de
JH		 164/* The following functions map to the LE SC SMP crypto functions
165 * AES-CMAC, f4, f5, f6, g2 and h6.
166 */
167
71af2f6b 168static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m,
cbbbe3e2
JH		 169 size_t len, u8 mac[16])
170{
171 uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
cbbbe3e2
JH		 172 int err;
173
174 if (len > CMAC_MSG_MAX)
175 return -EFBIG;
176
177 if (!tfm) {
178 BT_ERR("tfm %p", tfm);
179 return -EINVAL;
180 }
181
cbbbe3e2
JH		 182 /* Swap key and message from LSB to MSB */
183 swap_buf(k, tmp, 16);
184 swap_buf(m, msg_msb, len);
185
c7a3d57d
JH		 186 SMP_DBG("msg (len %zu) %*phN", len, (int) len, m);
187 SMP_DBG("key %16phN", k);
cbbbe3e2 188
71af2f6b 189 err = crypto_shash_setkey(tfm, tmp, 16);
cbbbe3e2
JH		 190 if (err) {
191 BT_ERR("cipher setkey failed: %d", err);
192 return err;
193 }
194
ec0bf6ed 195 err = crypto_shash_tfm_digest(tfm, msg_msb, len, mac_msb);
cbbbe3e2 196 if (err) {
71af2f6b 197 BT_ERR("Hash computation error %d", err);
cbbbe3e2
JH		 198 return err;
199 }
200
201 swap_buf(mac_msb, mac, 16);
202
c7a3d57d 203 SMP_DBG("mac %16phN", mac);
cbbbe3e2
JH		 204
205 return 0;
206}
207
71af2f6b
HX		 208static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32],
209 const u8 v[32], const u8 x[16], u8 z, u8 res[16])
cbbbe3e2
JH		 210{
211 u8 m[65];
212 int err;
213
c7a3d57d
JH		 214 SMP_DBG("u %32phN", u);
215 SMP_DBG("v %32phN", v);
216 SMP_DBG("x %16phN z %02x", x, z);
cbbbe3e2
JH		 217
218 m[0] = z;
219 memcpy(m + 1, v, 32);
220 memcpy(m + 33, u, 32);
221
222 err = aes_cmac(tfm_cmac, x, m, sizeof(m), res);
223 if (err)
224 return err;
225
c7a3d57d 226 SMP_DBG("res %16phN", res);
cbbbe3e2
JH		 227
228 return err;
229}
230
71af2f6b 231static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32],
4da50de8
JH		 232 const u8 n1[16], const u8 n2[16], const u8 a1[7],
233 const u8 a2[7], u8 mackey[16], u8 ltk[16])
760b018b
JH		 234{
235 /* The btle, salt and length "magic" values are as defined in
236 * the SMP section of the Bluetooth core specification. In ASCII
237 * the btle value ends up being 'btle'. The salt is just a
238 * random number whereas length is the value 256 in little
239 * endian format.
240 */
241 const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 };
242 const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60,
243 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c };
244 const u8 length[2] = { 0x00, 0x01 };
245 u8 m[53], t[16];
246 int err;
247
c7a3d57d
JH		 248 SMP_DBG("w %32phN", w);
249 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
250 SMP_DBG("a1 %7phN a2 %7phN", a1, a2);
760b018b
JH		 251
252 err = aes_cmac(tfm_cmac, salt, w, 32, t);
253 if (err)
254 return err;
255
c7a3d57d 256 SMP_DBG("t %16phN", t);
760b018b
JH		 257
258 memcpy(m, length, 2);
259 memcpy(m + 2, a2, 7);
260 memcpy(m + 9, a1, 7);
261 memcpy(m + 16, n2, 16);
262 memcpy(m + 32, n1, 16);
263 memcpy(m + 48, btle, 4);
264
265 m[52] = 0; /* Counter */
266
267 err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey);
268 if (err)
269 return err;
270
c7a3d57d 271 SMP_DBG("mackey %16phN", mackey);
760b018b
JH		 272
273 m[52] = 1; /* Counter */
274
275 err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk);
276 if (err)
277 return err;
278
c7a3d57d 279 SMP_DBG("ltk %16phN", ltk);
760b018b
JH		 280
281 return 0;
282}
283
71af2f6b 284static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16],
4da50de8 285 const u8 n1[16], const u8 n2[16], const u8 r[16],
760b018b
JH		 286 const u8 io_cap[3], const u8 a1[7], const u8 a2[7],
287 u8 res[16])
288{
289 u8 m[65];
290 int err;
291
c7a3d57d
JH		 292 SMP_DBG("w %16phN", w);
293 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
294 SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2);
760b018b
JH		 295
296 memcpy(m, a2, 7);
297 memcpy(m + 7, a1, 7);
298 memcpy(m + 14, io_cap, 3);
299 memcpy(m + 17, r, 16);
300 memcpy(m + 33, n2, 16);
301 memcpy(m + 49, n1, 16);
302
303 err = aes_cmac(tfm_cmac, w, m, sizeof(m), res);
304 if (err)
305 return err;
306
203de21b 307 SMP_DBG("res %16phN", res);
760b018b
JH		 308
309 return err;
310}
311
71af2f6b 312static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32],
191dc7fe
JH		 313 const u8 x[16], const u8 y[16], u32 *val)
314{
315 u8 m[80], tmp[16];
316 int err;
317
c7a3d57d
JH		 318 SMP_DBG("u %32phN", u);
319 SMP_DBG("v %32phN", v);
320 SMP_DBG("x %16phN y %16phN", x, y);
191dc7fe
JH		 321
322 memcpy(m, y, 16);
323 memcpy(m + 16, v, 32);
324 memcpy(m + 48, u, 32);
325
326 err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
327 if (err)
328 return err;
329
330 *val = get_unaligned_le32(tmp);
331 *val %= 1000000;
332
c7a3d57d 333 SMP_DBG("val %06u", *val);
191dc7fe
JH		 334
335 return 0;
336}
337
71af2f6b 338static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16],
06edf8de
JH		 339 const u8 key_id[4], u8 res[16])
340{
341 int err;
342
343 SMP_DBG("w %16phN key_id %4phN", w, key_id);
344
345 err = aes_cmac(tfm_cmac, w, key_id, 4, res);
346 if (err)
347 return err;
348
349 SMP_DBG("res %16phN", res);
350
351 return err;
352}
353
a62da6f1
JH		 354static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16],
355 const u8 salt[16], u8 res[16])
356{
357 int err;
358
359 SMP_DBG("w %16phN salt %16phN", w, salt);
360
361 err = aes_cmac(tfm_cmac, salt, w, 16, res);
362 if (err)
363 return err;
364
365 SMP_DBG("res %16phN", res);
366
367 return err;
368}
369
06edf8de
JH		 370/* The following functions map to the legacy SMP crypto functions e, c1,
371 * s1 and ah.
372 */
373
28a220aa 374static int smp_e(const u8 *k, u8 *r)
d22ef0bc 375{
28a220aa 376 struct crypto_aes_ctx ctx;
943a732a 377 uint8_t tmp[16], data[16];
201a5929 378 int err;
d22ef0bc 379
011c391a
JH		 380 SMP_DBG("k %16phN r %16phN", k, r);
381
943a732a 382 /* The most significant octet of key corresponds to k[0] */
8a2936f4 383 swap_buf(k, tmp, 16);
943a732a 384
28a220aa 385 err = aes_expandkey(&ctx, 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 393
28a220aa 394 aes_encrypt(&ctx, data, data);
d22ef0bc 395
943a732a 396 /* Most significant octet of encryptedData corresponds to data[0] */
8a2936f4 397 swap_buf(data, r, 16);
943a732a 398
011c391a
JH		 399 SMP_DBG("r %16phN", r);
400
c29fb5f6 401 memzero_explicit(&ctx, sizeof(ctx));
d22ef0bc
AB		 402 return err;
403}
404
28a220aa 405static int smp_c1(const u8 k[16],
06edf8de
JH		 406 const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
407 const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
6a77083a 408{
06edf8de 409 u8 p1[16], p2[16];
6a77083a
JH		 410 int err;
411
011c391a
JH		 412 SMP_DBG("k %16phN r %16phN", k, r);
413 SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra);
414 SMP_DBG("preq %7phN pres %7phN", preq, pres);
415
06edf8de 416 memset(p1, 0, 16);
6a77083a 417
06edf8de
JH		 418 /* p1 = pres || preq || _rat || _iat */
419 p1[0] = _iat;
420 p1[1] = _rat;
421 memcpy(p1 + 2, preq, 7);
422 memcpy(p1 + 9, pres, 7);
423
011c391a 424 SMP_DBG("p1 %16phN", p1);
06edf8de
JH		 425
426 /* res = r XOR p1 */
ef0bb5ad 427 crypto_xor_cpy(res, r, p1, sizeof(p1));
06edf8de
JH		 428
429 /* res = e(k, res) */
28a220aa 430 err = smp_e(k, res);
06edf8de
JH		 431 if (err) {
432 BT_ERR("Encrypt data error");
6a77083a 433 return err;
06edf8de 434 }
6a77083a 435
011c391a
JH		 436 /* p2 = padding || ia || ra */
437 memcpy(p2, ra, 6);
438 memcpy(p2 + 6, ia, 6);
439 memset(p2 + 12, 0, 4);
440
441 SMP_DBG("p2 %16phN", p2);
442
06edf8de 443 /* res = res XOR p2 */
ef0bb5ad 444 crypto_xor(res, p2, sizeof(p2));
06edf8de
JH		 445
446 /* res = e(k, res) */
28a220aa 447 err = smp_e(k, res);
06edf8de
JH		 448 if (err)
449 BT_ERR("Encrypt data error");
450
451 return err;
452}
453
28a220aa 454static int smp_s1(const u8 k[16],
06edf8de
JH		 455 const u8 r1[16], const u8 r2[16], u8 _r[16])
456{
457 int err;
458
459 /* Just least significant octets from r1 and r2 are considered */
460 memcpy(_r, r2, 8);
461 memcpy(_r + 8, r1, 8);
462
28a220aa 463 err = smp_e(k, _r);
06edf8de
JH		 464 if (err)
465 BT_ERR("Encrypt data error");
6a77083a
JH		 466
467 return err;
468}
469
28a220aa 470static int smp_ah(const u8 irk[16], const u8 r[3], u8 res[3])
60478054 471{
943a732a 472 u8 _res[16];
60478054
JH		 473 int err;
474
475 /* r' = padding || r */
943a732a
JH		 476 memcpy(_res, r, 3);
477 memset(_res + 3, 0, 13);
60478054 478
28a220aa 479 err = smp_e(irk, _res);
60478054
JH		 480 if (err) {
481 BT_ERR("Encrypt error");
482 return err;
483 }
484
485 /* The output of the random address function ah is:
c5080d42 486 * ah(k, r) = e(k, r') mod 2^24
60478054
JH		 487 * The output of the security function e is then truncated to 24 bits
488 * by taking the least significant 24 bits of the output of e as the
489 * result of ah.
490 */
943a732a 491 memcpy(res, _res, 3);
60478054
JH		 492
493 return 0;
494}
495
cd082797
JH		 496bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
497 const bdaddr_t *bdaddr)
60478054 498{
defce9e8 499 struct l2cap_chan *chan = hdev->smp_data;
60478054
JH		 500 u8 hash[3];
501 int err;
502
defce9e8
JH		 503 if (!chan || !chan->data)
504 return false;
505
56860245 506 bt_dev_dbg(hdev, "RPA %pMR IRK %*phN", bdaddr, 16, irk);
60478054 507
28a220aa 508 err = smp_ah(irk, &bdaddr->b[3], hash);
60478054
JH		 509 if (err)
510 return false;
511
329d8230 512 return !crypto_memneq(bdaddr->b, hash, 3);
60478054
JH		 513}
514
cd082797 515int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
b1e2b3ae 516{
defce9e8 517 struct l2cap_chan *chan = hdev->smp_data;
b1e2b3ae
JH		 518 int err;
519
defce9e8
JH		 520 if (!chan || !chan->data)
521 return -EOPNOTSUPP;
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
28a220aa 528 err = smp_ah(irk, &rpa->b[3], rpa->b);
b1e2b3ae
JH		 529 if (err < 0)
530 return err;
531
56860245 532 bt_dev_dbg(hdev, "RPA %pMR", rpa);
b1e2b3ae
JH		 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)) {
56860245 549 bt_dev_dbg(hdev, "Using debug keys");
c0153b0b
TA		 550 err = set_ecdh_privkey(smp->tfm_ecdh, debug_sk);
551 if (err)
552 return err;
60a27d65 553 memcpy(smp->local_pk, debug_pk, 64);
60a27d65
MH		 554 smp->debug_key = true;
555 } else {
556 while (true) {
c0153b0b
TA		 557 /* Generate key pair for Secure Connections */
558 err = generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk);
a2976416
TA		 559 if (err)
560 return err;
60a27d65
MH		 561
562 /* This is unlikely, but we need to check that
91641b79 563 * we didn't accidentally generate a debug key.
60a27d65 564 */
c0153b0b 565 if (crypto_memneq(smp->local_pk, debug_pk, 64))
60a27d65
MH		 566 break;
567 }
568 smp->debug_key = false;
569 }
570
571 SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
572 SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
60a27d65 573
fb334fee 574 get_random_bytes(smp->local_rand, 16);
60a27d65
MH		 575
576 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
fb334fee 577 smp->local_rand, 0, hash);
60a27d65
MH		 578 if (err < 0)
579 return err;
580
fb334fee 581 memcpy(rand, smp->local_rand, 16);
60a27d65 582
94f14e47
JH		 583 smp->local_oob = true;
584
60a27d65
MH		 585 return 0;
586}
587
5d88cc73 588static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
eb492e01 589{
5d88cc73 590 struct l2cap_chan *chan = conn->smp;
b68fda68 591 struct smp_chan *smp;
5d88cc73
JH		 592 struct kvec iv[2];
593 struct msghdr msg;
eb492e01 594
5d88cc73
JH		 595 if (!chan)
596 return;
eb492e01 597
2e1614f7 598 bt_dev_dbg(conn->hcon->hdev, "code 0x%2.2x", code);
eb492e01 599
5d88cc73
JH		 600 iv[0].iov_base = &code;
601 iv[0].iov_len = 1;
eb492e01 602
5d88cc73
JH		 603 iv[1].iov_base = data;
604 iv[1].iov_len = len;
eb492e01 605
5d88cc73 606 memset(&msg, 0, sizeof(msg));
eb492e01 607
aa563d7b 608 iov_iter_kvec(&msg.msg_iter, WRITE, iv, 2, 1 + len);
eb492e01 609
5d88cc73 610 l2cap_chan_send(chan, &msg, 1 + len);
e2dcd113 611
b68fda68
JH		 612 if (!chan->data)
613 return;
614
615 smp = chan->data;
616
617 cancel_delayed_work_sync(&smp->security_timer);
1b0921d6 618 schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
eb492e01
AB		 619}
620
d2eb9e10 621static u8 authreq_to_seclevel(u8 authreq)
2b64d153 622{
d2eb9e10
JH		 623 if (authreq & SMP_AUTH_MITM) {
624 if (authreq & SMP_AUTH_SC)
625 return BT_SECURITY_FIPS;
626 else
627 return BT_SECURITY_HIGH;
628 } else {
2b64d153 629 return BT_SECURITY_MEDIUM;
d2eb9e10 630 }
2b64d153
BG		 631}
632
633static __u8 seclevel_to_authreq(__u8 sec_level)
634{
635 switch (sec_level) {
d2eb9e10 636 case BT_SECURITY_FIPS:
2b64d153
BG		 637 case BT_SECURITY_HIGH:
638 return SMP_AUTH_MITM | SMP_AUTH_BONDING;
639 case BT_SECURITY_MEDIUM:
640 return SMP_AUTH_BONDING;
641 default:
642 return SMP_AUTH_NONE;
643 }
644}
645
b8e66eac 646static void build_pairing_cmd(struct l2cap_conn *conn,
f1560463
MH		 647 struct smp_cmd_pairing *req,
648 struct smp_cmd_pairing *rsp, __u8 authreq)
b8e66eac 649{
5d88cc73
JH		 650 struct l2cap_chan *chan = conn->smp;
651 struct smp_chan *smp = chan->data;
fd349c02
JH		 652 struct hci_conn *hcon = conn->hcon;
653 struct hci_dev *hdev = hcon->hdev;
02b05bd8 654 u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT;
54790f73 655
d7a5a11d 656 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
7ee4ea36
MH		 657 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
658 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
54790f73 659 authreq |= SMP_AUTH_BONDING;
2b64d153
BG		 660 } else {
661 authreq &= ~SMP_AUTH_BONDING;
54790f73
VCG		 662 }
663
d7a5a11d 664 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
fd349c02
JH		 665 remote_dist |= SMP_DIST_ID_KEY;
666
d7a5a11d 667 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
863efaf2
JH		 668 local_dist |= SMP_DIST_ID_KEY;
669
d7a5a11d 670 if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&
02b05bd8
JH		 671 (authreq & SMP_AUTH_SC)) {
672 struct oob_data *oob_data;
673 u8 bdaddr_type;
674
d7a5a11d 675 if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
df8e1a4c
JH		 676 local_dist |= SMP_DIST_LINK_KEY;
677 remote_dist |= SMP_DIST_LINK_KEY;
678 }
02b05bd8
JH		 679
680 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
681 bdaddr_type = BDADDR_LE_PUBLIC;
682 else
683 bdaddr_type = BDADDR_LE_RANDOM;
684
685 oob_data = hci_find_remote_oob_data(hdev, &hcon->dst,
686 bdaddr_type);
4775a4ea 687 if (oob_data && oob_data->present) {
1a8bab4f 688 set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags);
02b05bd8 689 oob_flag = SMP_OOB_PRESENT;
a29b0733 690 memcpy(smp->rr, oob_data->rand256, 16);
02b05bd8 691 memcpy(smp->pcnf, oob_data->hash256, 16);
bc07cd69
MH		 692 SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf);
693 SMP_DBG("OOB Remote Random: %16phN", smp->rr);
02b05bd8
JH		 694 }
695
df8e1a4c
JH		 696 } else {
697 authreq &= ~SMP_AUTH_SC;
698 }
699
54790f73
VCG		 700 if (rsp == NULL) {
701 req->io_capability = conn->hcon->io_capability;
02b05bd8 702 req->oob_flag = oob_flag;
30d65e08 703 req->max_key_size = hdev->le_max_key_size;
fd349c02
JH		 704 req->init_key_dist = local_dist;
705 req->resp_key_dist = remote_dist;
0edb14de 706 req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 707
708 smp->remote_key_dist = remote_dist;
54790f73
VCG		 709 return;
710 }
711
712 rsp->io_capability = conn->hcon->io_capability;
02b05bd8 713 rsp->oob_flag = oob_flag;
30d65e08 714 rsp->max_key_size = hdev->le_max_key_size;
fd349c02
JH		 715 rsp->init_key_dist = req->init_key_dist & remote_dist;
716 rsp->resp_key_dist = req->resp_key_dist & local_dist;
0edb14de 717 rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 718
719 smp->remote_key_dist = rsp->init_key_dist;
b8e66eac
VCG		 720}
721
3158c50c
VCG		 722static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
723{
5d88cc73 724 struct l2cap_chan *chan = conn->smp;
2fd36558 725 struct hci_dev *hdev = conn->hcon->hdev;
5d88cc73 726 struct smp_chan *smp = chan->data;
1c1def09 727
49c06c9e
ŁR		 728 if (conn->hcon->pending_sec_level == BT_SECURITY_FIPS &&
729 max_key_size != SMP_MAX_ENC_KEY_SIZE)
730 return SMP_ENC_KEY_SIZE;
731
30d65e08 732 if (max_key_size > hdev->le_max_key_size ||
2fd36558 733 max_key_size < SMP_MIN_ENC_KEY_SIZE)
3158c50c
VCG		 734 return SMP_ENC_KEY_SIZE;
735
f7aa611a 736 smp->enc_key_size = max_key_size;
3158c50c
VCG		 737
738 return 0;
739}
740
6f48e260
JH		 741static void smp_chan_destroy(struct l2cap_conn *conn)
742{
743 struct l2cap_chan *chan = conn->smp;
744 struct smp_chan *smp = chan->data;
923e2414 745 struct hci_conn *hcon = conn->hcon;
6f48e260
JH		 746 bool complete;
747
748 BUG_ON(!smp);
749
750 cancel_delayed_work_sync(&smp->security_timer);
6f48e260 751
6f48e260 752 complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
923e2414 753 mgmt_smp_complete(hcon, complete);
6f48e260 754
453431a5 755 kfree_sensitive(smp->csrk);
fad646e1 756 kfree_sensitive(smp->responder_csrk);
453431a5 757 kfree_sensitive(smp->link_key);
6f48e260 758
71af2f6b 759 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 760 crypto_free_kpp(smp->tfm_ecdh);
6f48e260 761
923e2414
JH		 762 /* Ensure that we don't leave any debug key around if debug key
763 * support hasn't been explicitly enabled.
764 */
765 if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG &&
d7a5a11d 766 !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) {
923e2414
JH		 767 list_del_rcu(&smp->ltk->list);
768 kfree_rcu(smp->ltk, rcu);
769 smp->ltk = NULL;
770 }
771
6f48e260
JH		 772 /* If pairing failed clean up any keys we might have */
773 if (!complete) {
774 if (smp->ltk) {
970d0f1b
JH		 775 list_del_rcu(&smp->ltk->list);
776 kfree_rcu(smp->ltk, rcu);
6f48e260
JH		 777 }
778
fad646e1
AP		 779 if (smp->responder_ltk) {
780 list_del_rcu(&smp->responder_ltk->list);
781 kfree_rcu(smp->responder_ltk, rcu);
6f48e260
JH		 782 }
783
784 if (smp->remote_irk) {
adae20cb
JH		 785 list_del_rcu(&smp->remote_irk->list);
786 kfree_rcu(smp->remote_irk, rcu);
6f48e260
JH		 787 }
788 }
789
790 chan->data = NULL;
453431a5 791 kfree_sensitive(smp);
923e2414 792 hci_conn_drop(hcon);
6f48e260
JH		 793}
794
84794e11 795static void smp_failure(struct l2cap_conn *conn, u8 reason)
4f957a76 796{
bab73cb6 797 struct hci_conn *hcon = conn->hcon;
b68fda68 798 struct l2cap_chan *chan = conn->smp;
bab73cb6 799
84794e11 800 if (reason)
4f957a76 801 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
f1560463 802 &reason);
4f957a76 803
e1e930f5 804 mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE);
f1c09c07 805
fc75cc86 806 if (chan->data)
f1c09c07 807 smp_chan_destroy(conn);
4f957a76
BG		 808}
809
2b64d153
BG		 810#define JUST_WORKS 0x00
811#define JUST_CFM 0x01
812#define REQ_PASSKEY 0x02
813#define CFM_PASSKEY 0x03
814#define REQ_OOB 0x04
5e3d3d9b 815#define DSP_PASSKEY 0x05
2b64d153
BG		 816#define OVERLAP 0xFF
817
818static const u8 gen_method[5][5] = {
819 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
820 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
821 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
822 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
823 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
824};
825
5e3d3d9b
JH		 826static const u8 sc_method[5][5] = {
827 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
828 { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
829 { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY },
830 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
831 { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
832};
833
581370cc
JH		 834static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io)
835{
2bcd4003
JH		 836 /* If either side has unknown io_caps, use JUST_CFM (which gets
837 * converted later to JUST_WORKS if we're initiators.
838 */
581370cc
JH		 839 if (local_io > SMP_IO_KEYBOARD_DISPLAY ||
840 remote_io > SMP_IO_KEYBOARD_DISPLAY)
2bcd4003 841 return JUST_CFM;
581370cc 842
5e3d3d9b
JH		 843 if (test_bit(SMP_FLAG_SC, &smp->flags))
844 return sc_method[remote_io][local_io];
845
581370cc
JH		 846 return gen_method[remote_io][local_io];
847}
848
2b64d153
BG		 849static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
850 u8 local_io, u8 remote_io)
851{
852 struct hci_conn *hcon = conn->hcon;
5d88cc73
JH		 853 struct l2cap_chan *chan = conn->smp;
854 struct smp_chan *smp = chan->data;
2b64d153 855 u32 passkey = 0;
d1d900f8 856 int ret;
2b64d153
BG		 857
858 /* Initialize key for JUST WORKS */
859 memset(smp->tk, 0, sizeof(smp->tk));
4a74d658 860 clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153 861
83b4b195 862 bt_dev_dbg(hcon->hdev, "auth:%u lcl:%u rem:%u", auth, local_io,
2e1614f7 863 remote_io);
2b64d153 864
2bcd4003
JH		 865 /* If neither side wants MITM, either "just" confirm an incoming
866 * request or use just-works for outgoing ones. The JUST_CFM
867 * will be converted to JUST_WORKS if necessary later in this
868 * function. If either side has MITM look up the method from the
869 * table.
870 */
581370cc 871 if (!(auth & SMP_AUTH_MITM))
783e0574 872 smp->method = JUST_CFM;
2b64d153 873 else
783e0574 874 smp->method = get_auth_method(smp, local_io, remote_io);
2b64d153 875
a82505c7 876 /* Don't confirm locally initiated pairing attempts */
783e0574
JH		 877 if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
878 &smp->flags))
879 smp->method = JUST_WORKS;
a82505c7 880
02f3e254 881 /* Don't bother user space with no IO capabilities */
783e0574
JH		 882 if (smp->method == JUST_CFM &&
883 hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
884 smp->method = JUST_WORKS;
02f3e254 885
92516cd9
SS		 886 /* If Just Works, Continue with Zero TK and ask user-space for
887 * confirmation */
783e0574 888 if (smp->method == JUST_WORKS) {
d1d900f8 889 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
92516cd9
SS		 890 hcon->type,
891 hcon->dst_type,
892 passkey, 1);
d1d900f8
GR		 893 if (ret)
894 return ret;
92516cd9 895 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2b64d153
BG		 896 return 0;
897 }
898
19c5ce9c
JH		 899 /* If this function is used for SC -> legacy fallback we
900 * can only recover the just-works case.
901 */
902 if (test_bit(SMP_FLAG_SC, &smp->flags))
903 return -EINVAL;
904
2b64d153 905 /* Not Just Works/Confirm results in MITM Authentication */
783e0574 906 if (smp->method != JUST_CFM) {
4a74d658 907 set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
5eb596f5
JH		 908 if (hcon->pending_sec_level < BT_SECURITY_HIGH)
909 hcon->pending_sec_level = BT_SECURITY_HIGH;
910 }
2b64d153 911
74be523c
AP		 912 /* If both devices have Keyboard-Display I/O, the initiator
913 * Confirms and the responder Enters the passkey.
2b64d153 914 */
783e0574 915 if (smp->method == OVERLAP) {
40bef302 916 if (hcon->role == HCI_ROLE_MASTER)
783e0574 917 smp->method = CFM_PASSKEY;
2b64d153 918 else
783e0574 919 smp->method = REQ_PASSKEY;
2b64d153
BG		 920 }
921
01ad34d2 922 /* Generate random passkey. */
783e0574 923 if (smp->method == CFM_PASSKEY) {
943a732a 924 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153
BG		 925 get_random_bytes(&passkey, sizeof(passkey));
926 passkey %= 1000000;
943a732a 927 put_unaligned_le32(passkey, smp->tk);
83b4b195 928 bt_dev_dbg(hcon->hdev, "PassKey: %u", passkey);
4a74d658 929 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 930 }
931
783e0574 932 if (smp->method == REQ_PASSKEY)
ce39fb4e 933 ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst,
272d90df 934 hcon->type, hcon->dst_type);
783e0574 935 else if (smp->method == JUST_CFM)
4eb65e66
JH		 936 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
937 hcon->type, hcon->dst_type,
938 passkey, 1);
2b64d153 939 else
01ad34d2 940 ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst,
272d90df 941 hcon->type, hcon->dst_type,
39adbffe 942 passkey, 0);
2b64d153 943
2b64d153
BG		 944 return ret;
945}
946
1cc61144 947static u8 smp_confirm(struct smp_chan *smp)
8aab4757 948{
8aab4757 949 struct l2cap_conn *conn = smp->conn;
8aab4757
VCG		 950 struct smp_cmd_pairing_confirm cp;
951 int ret;
8aab4757 952
2e1614f7 953 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
8aab4757 954
28a220aa 955 ret = smp_c1(smp->tk, smp->prnd, smp->preq, smp->prsp,
b1cd5fd9 956 conn->hcon->init_addr_type, &conn->hcon->init_addr,
943a732a
JH		 957 conn->hcon->resp_addr_type, &conn->hcon->resp_addr,
958 cp.confirm_val);
1cc61144
JH		 959 if (ret)
960 return SMP_UNSPECIFIED;
8aab4757 961
4a74d658 962 clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153 963
8aab4757
VCG		 964 smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
965
b28b4943
JH		 966 if (conn->hcon->out)
967 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
968 else
969 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
970
1cc61144 971 return 0;
8aab4757
VCG		 972}
973
861580a9 974static u8 smp_random(struct smp_chan *smp)
8aab4757 975{
8aab4757
VCG		 976 struct l2cap_conn *conn = smp->conn;
977 struct hci_conn *hcon = conn->hcon;
861580a9 978 u8 confirm[16];
8aab4757
VCG		 979 int ret;
980
2e1614f7 981 bt_dev_dbg(conn->hcon->hdev, "conn %p %s", conn,
fad646e1 982 conn->hcon->out ? "initiator" : "responder");
8aab4757 983
28a220aa 984 ret = smp_c1(smp->tk, smp->rrnd, smp->preq, smp->prsp,
b1cd5fd9 985 hcon->init_addr_type, &hcon->init_addr,
943a732a 986 hcon->resp_addr_type, &hcon->resp_addr, confirm);
861580a9
JH		 987 if (ret)
988 return SMP_UNSPECIFIED;
8aab4757 989
329d8230 990 if (crypto_memneq(smp->pcnf, confirm, sizeof(smp->pcnf))) {
2064ee33
MH		 991 bt_dev_err(hcon->hdev, "pairing failed "
992 "(confirmation values mismatch)");
861580a9 993 return SMP_CONFIRM_FAILED;
8aab4757
VCG		 994 }
995
996 if (hcon->out) {
fe39c7b2
MH		 997 u8 stk[16];
998 __le64 rand = 0;
999 __le16 ediv = 0;
8aab4757 1000
28a220aa 1001 smp_s1(smp->tk, smp->rrnd, smp->prnd, stk);
8aab4757 1002
861580a9
JH		 1003 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
1004 return SMP_UNSPECIFIED;
8aab4757 1005
8b76ce34 1006 hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size);
f7aa611a 1007 hcon->enc_key_size = smp->enc_key_size;
fe59a05f 1008 set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
8aab4757 1009 } else {
fff3490f 1010 u8 stk[16], auth;
fe39c7b2
MH		 1011 __le64 rand = 0;
1012 __le16 ediv = 0;
8aab4757 1013
943a732a
JH		 1014 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
1015 smp->prnd);
8aab4757 1016
28a220aa 1017 smp_s1(smp->tk, smp->prnd, smp->rrnd, stk);
8aab4757 1018
fff3490f
JH		 1019 if (hcon->pending_sec_level == BT_SECURITY_HIGH)
1020 auth = 1;
1021 else
1022 auth = 0;
1023
fad646e1
AP		 1024 /* Even though there's no _RESPONDER suffix this is the
1025 * responder STK we're adding for later lookup (the initiator
7d5843b7
JH		 1026 * STK never needs to be stored).
1027 */
ce39fb4e 1028 hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
2ceba539 1029 SMP_STK, auth, stk, smp->enc_key_size, ediv, rand);
8aab4757
VCG		 1030 }
1031
861580a9 1032 return 0;
8aab4757
VCG		 1033}
1034
44f1a7ab
JH		 1035static void smp_notify_keys(struct l2cap_conn *conn)
1036{
1037 struct l2cap_chan *chan = conn->smp;
1038 struct smp_chan *smp = chan->data;
1039 struct hci_conn *hcon = conn->hcon;
1040 struct hci_dev *hdev = hcon->hdev;
1041 struct smp_cmd_pairing *req = (void *) &smp->preq[1];
1042 struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1];
1043 bool persistent;
1044
cad20c27
JH		 1045 if (hcon->type == ACL_LINK) {
1046 if (hcon->key_type == HCI_LK_DEBUG_COMBINATION)
1047 persistent = false;
1048 else
1049 persistent = !test_bit(HCI_CONN_FLUSH_KEY,
1050 &hcon->flags);
1051 } else {
1052 /* The LTKs, IRKs and CSRKs should be persistent only if
1053 * both sides had the bonding bit set in their
1054 * authentication requests.
1055 */
1056 persistent = !!((req->auth_req & rsp->auth_req) &
1057 SMP_AUTH_BONDING);
1058 }
1059
44f1a7ab 1060 if (smp->remote_irk) {
cad20c27
JH		 1061 mgmt_new_irk(hdev, smp->remote_irk, persistent);
1062
44f1a7ab
JH		 1063 /* Now that user space can be considered to know the
1064 * identity address track the connection based on it
b5ae344d 1065 * from now on (assuming this is an LE link).
44f1a7ab 1066 */
b5ae344d
JH		 1067 if (hcon->type == LE_LINK) {
1068 bacpy(&hcon->dst, &smp->remote_irk->bdaddr);
1069 hcon->dst_type = smp->remote_irk->addr_type;
1070 queue_work(hdev->workqueue, &conn->id_addr_update_work);
1071 }
44f1a7ab
JH		 1072 }
1073
44f1a7ab
JH		 1074 if (smp->csrk) {
1075 smp->csrk->bdaddr_type = hcon->dst_type;
1076 bacpy(&smp->csrk->bdaddr, &hcon->dst);
1077 mgmt_new_csrk(hdev, smp->csrk, persistent);
1078 }
1079
fad646e1
AP		 1080 if (smp->responder_csrk) {
1081 smp->responder_csrk->bdaddr_type = hcon->dst_type;
1082 bacpy(&smp->responder_csrk->bdaddr, &hcon->dst);
1083 mgmt_new_csrk(hdev, smp->responder_csrk, persistent);
44f1a7ab
JH		 1084 }
1085
1086 if (smp->ltk) {
1087 smp->ltk->bdaddr_type = hcon->dst_type;
1088 bacpy(&smp->ltk->bdaddr, &hcon->dst);
1089 mgmt_new_ltk(hdev, smp->ltk, persistent);
1090 }
1091
fad646e1
AP		 1092 if (smp->responder_ltk) {
1093 smp->responder_ltk->bdaddr_type = hcon->dst_type;
1094 bacpy(&smp->responder_ltk->bdaddr, &hcon->dst);
1095 mgmt_new_ltk(hdev, smp->responder_ltk, persistent);
44f1a7ab 1096 }
6a77083a
JH		 1097
1098 if (smp->link_key) {
e3befab9
JH		 1099 struct link_key *key;
1100 u8 type;
1101
1102 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1103 type = HCI_LK_DEBUG_COMBINATION;
1104 else if (hcon->sec_level == BT_SECURITY_FIPS)
1105 type = HCI_LK_AUTH_COMBINATION_P256;
1106 else
1107 type = HCI_LK_UNAUTH_COMBINATION_P256;
1108
1109 key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst,
1110 smp->link_key, type, 0, &persistent);
1111 if (key) {
1112 mgmt_new_link_key(hdev, key, persistent);
1113
1114 /* Don't keep debug keys around if the relevant
1115 * flag is not set.
1116 */
d7a5a11d 1117 if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) &&
e3befab9
JH		 1118 key->type == HCI_LK_DEBUG_COMBINATION) {
1119 list_del_rcu(&key->list);
1120 kfree_rcu(key, rcu);
1121 }
1122 }
6a77083a
JH		 1123 }
1124}
1125
d3e54a87
JH		 1126static void sc_add_ltk(struct smp_chan *smp)
1127{
1128 struct hci_conn *hcon = smp->conn->hcon;
1129 u8 key_type, auth;
1130
1131 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1132 key_type = SMP_LTK_P256_DEBUG;
1133 else
1134 key_type = SMP_LTK_P256;
1135
1136 if (hcon->pending_sec_level == BT_SECURITY_FIPS)
1137 auth = 1;
1138 else
1139 auth = 0;
1140
d3e54a87
JH		 1141 smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
1142 key_type, auth, smp->tk, smp->enc_key_size,
1143 0, 0);
1144}
1145
6a77083a
JH		 1146static void sc_generate_link_key(struct smp_chan *smp)
1147{
a62da6f1 1148 /* From core spec. Spells out in ASCII as 'lebr'. */
6a77083a
JH		 1149 const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c };
1150
1151 smp->link_key = kzalloc(16, GFP_KERNEL);
1152 if (!smp->link_key)
1153 return;
1154
a62da6f1 1155 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
151129df 1156 /* SALT = 0x000000000000000000000000746D7031 */
a62da6f1
JH		 1157 const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 };
1158
1159 if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) {
453431a5 1160 kfree_sensitive(smp->link_key);
a62da6f1
JH		 1161 smp->link_key = NULL;
1162 return;
1163 }
1164 } else {
1165 /* From core spec. Spells out in ASCII as 'tmp1'. */
1166 const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 };
1167
1168 if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) {
453431a5 1169 kfree_sensitive(smp->link_key);
a62da6f1
JH		 1170 smp->link_key = NULL;
1171 return;
1172 }
6a77083a
JH		 1173 }
1174
1175 if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) {
453431a5 1176 kfree_sensitive(smp->link_key);
6a77083a
JH		 1177 smp->link_key = NULL;
1178 return;
1179 }
44f1a7ab
JH		 1180}
1181
b28b4943
JH		 1182static void smp_allow_key_dist(struct smp_chan *smp)
1183{
1184 /* Allow the first expected phase 3 PDU. The rest of the PDUs
1185 * will be allowed in each PDU handler to ensure we receive
1186 * them in the correct order.
1187 */
1188 if (smp->remote_key_dist & SMP_DIST_ENC_KEY)
1189 SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO);
1190 else if (smp->remote_key_dist & SMP_DIST_ID_KEY)
1191 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
1192 else if (smp->remote_key_dist & SMP_DIST_SIGN)
1193 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
1194}
1195
b5ae344d
JH		 1196static void sc_generate_ltk(struct smp_chan *smp)
1197{
a62da6f1 1198 /* From core spec. Spells out in ASCII as 'brle'. */
b5ae344d
JH		 1199 const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 };
1200 struct hci_conn *hcon = smp->conn->hcon;
1201 struct hci_dev *hdev = hcon->hdev;
1202 struct link_key *key;
1203
1204 key = hci_find_link_key(hdev, &hcon->dst);
1205 if (!key) {
2064ee33 1206 bt_dev_err(hdev, "no Link Key found to generate LTK");
b5ae344d
JH		 1207 return;
1208 }
1209
1210 if (key->type == HCI_LK_DEBUG_COMBINATION)
1211 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1212
a62da6f1 1213 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
151129df 1214 /* SALT = 0x000000000000000000000000746D7032 */
a62da6f1
JH		 1215 const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 };
1216
1217 if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk))
1218 return;
1219 } else {
1220 /* From core spec. Spells out in ASCII as 'tmp2'. */
1221 const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 };
1222
1223 if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk))
1224 return;
1225 }
b5ae344d
JH		 1226
1227 if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk))
1228 return;
1229
1230 sc_add_ltk(smp);
1231}
1232
d6268e86 1233static void smp_distribute_keys(struct smp_chan *smp)
44f1a7ab
JH		 1234{
1235 struct smp_cmd_pairing *req, *rsp;
86d1407c 1236 struct l2cap_conn *conn = smp->conn;
44f1a7ab
JH		 1237 struct hci_conn *hcon = conn->hcon;
1238 struct hci_dev *hdev = hcon->hdev;
1239 __u8 *keydist;
1240
2e1614f7 1241 bt_dev_dbg(hdev, "conn %p", conn);
44f1a7ab 1242
44f1a7ab
JH		 1243 rsp = (void *) &smp->prsp[1];
1244
1245 /* The responder sends its keys first */
b28b4943
JH		 1246 if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) {
1247 smp_allow_key_dist(smp);
86d1407c 1248 return;
b28b4943 1249 }
44f1a7ab
JH		 1250
1251 req = (void *) &smp->preq[1];
1252
1253 if (hcon->out) {
1254 keydist = &rsp->init_key_dist;
1255 *keydist &= req->init_key_dist;
1256 } else {
1257 keydist = &rsp->resp_key_dist;
1258 *keydist &= req->resp_key_dist;
1259 }
1260
6a77083a 1261 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
b5ae344d 1262 if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY))
6a77083a 1263 sc_generate_link_key(smp);
b5ae344d
JH		 1264 if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY))
1265 sc_generate_ltk(smp);
6a77083a
JH		 1266
1267 /* Clear the keys which are generated but not distributed */
1268 *keydist &= ~SMP_SC_NO_DIST;
1269 }
1270
2e1614f7 1271 bt_dev_dbg(hdev, "keydist 0x%x", *keydist);
44f1a7ab
JH		 1272
1273 if (*keydist & SMP_DIST_ENC_KEY) {
1274 struct smp_cmd_encrypt_info enc;
fad646e1 1275 struct smp_cmd_initiator_ident ident;
44f1a7ab
JH		 1276 struct smp_ltk *ltk;
1277 u8 authenticated;
1278 __le16 ediv;
1279 __le64 rand;
1280
1fc62c52
JH		 1281 /* Make sure we generate only the significant amount of
1282 * bytes based on the encryption key size, and set the rest
1283 * of the value to zeroes.
1284 */
1285 get_random_bytes(enc.ltk, smp->enc_key_size);
1286 memset(enc.ltk + smp->enc_key_size, 0,
1287 sizeof(enc.ltk) - smp->enc_key_size);
1288
44f1a7ab
JH		 1289 get_random_bytes(&ediv, sizeof(ediv));
1290 get_random_bytes(&rand, sizeof(rand));
1291
1292 smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
1293
1294 authenticated = hcon->sec_level == BT_SECURITY_HIGH;
1295 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type,
fad646e1 1296 SMP_LTK_RESPONDER, authenticated, enc.ltk,
44f1a7ab 1297 smp->enc_key_size, ediv, rand);
fad646e1 1298 smp->responder_ltk = ltk;
44f1a7ab
JH		 1299
1300 ident.ediv = ediv;
1301 ident.rand = rand;
1302
fad646e1
AP		 1303 smp_send_cmd(conn, SMP_CMD_INITIATOR_IDENT, sizeof(ident),
1304 &ident);
44f1a7ab
JH		 1305
1306 *keydist &= ~SMP_DIST_ENC_KEY;
1307 }
1308
1309 if (*keydist & SMP_DIST_ID_KEY) {
1310 struct smp_cmd_ident_addr_info addrinfo;
1311 struct smp_cmd_ident_info idinfo;
1312
1313 memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk));
1314
1315 smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
1316
1317 /* The hci_conn contains the local identity address
1318 * after the connection has been established.
1319 *
1320 * This is true even when the connection has been
1321 * established using a resolvable random address.
1322 */
1323 bacpy(&addrinfo.bdaddr, &hcon->src);
1324 addrinfo.addr_type = hcon->src_type;
1325
1326 smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
1327 &addrinfo);
1328
1329 *keydist &= ~SMP_DIST_ID_KEY;
1330 }
1331
1332 if (*keydist & SMP_DIST_SIGN) {
1333 struct smp_cmd_sign_info sign;
1334 struct smp_csrk *csrk;
1335
1336 /* Generate a new random key */
1337 get_random_bytes(sign.csrk, sizeof(sign.csrk));
1338
1339 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
1340 if (csrk) {
4cd3928a
JH		 1341 if (hcon->sec_level > BT_SECURITY_MEDIUM)
1342 csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED;
1343 else
1344 csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED;
44f1a7ab
JH		 1345 memcpy(csrk->val, sign.csrk, sizeof(csrk->val));
1346 }
fad646e1 1347 smp->responder_csrk = csrk;
44f1a7ab
JH		 1348
1349 smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
1350
1351 *keydist &= ~SMP_DIST_SIGN;
1352 }
1353
1354 /* If there are still keys to be received wait for them */
b28b4943
JH		 1355 if (smp->remote_key_dist & KEY_DIST_MASK) {
1356 smp_allow_key_dist(smp);
86d1407c 1357 return;
b28b4943 1358 }
44f1a7ab 1359
44f1a7ab
JH		 1360 set_bit(SMP_FLAG_COMPLETE, &smp->flags);
1361 smp_notify_keys(conn);
1362
1363 smp_chan_destroy(conn);
44f1a7ab
JH		 1364}
1365
b68fda68
JH		 1366static void smp_timeout(struct work_struct *work)
1367{
1368 struct smp_chan *smp = container_of(work, struct smp_chan,
1369 security_timer.work);
1370 struct l2cap_conn *conn = smp->conn;
1371
2e1614f7 1372 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
b68fda68 1373
1e91c29e 1374 hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM);
b68fda68
JH		 1375}
1376
8aab4757
VCG		 1377static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
1378{
2e1614f7 1379 struct hci_conn *hcon = conn->hcon;
5d88cc73 1380 struct l2cap_chan *chan = conn->smp;
8aab4757
VCG		 1381 struct smp_chan *smp;
1382
f1560463 1383 smp = kzalloc(sizeof(*smp), GFP_ATOMIC);
fc75cc86 1384 if (!smp)
8aab4757
VCG		 1385 return NULL;
1386
71af2f6b 1387 smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
407cecf6 1388 if (IS_ERR(smp->tfm_cmac)) {
2e1614f7 1389 bt_dev_err(hcon->hdev, "Unable to create CMAC crypto context");
28a220aa 1390 goto zfree_smp;
47eb2ac8
TA		 1391 }
1392
6763f5ea 1393 smp->tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0);
47eb2ac8 1394 if (IS_ERR(smp->tfm_ecdh)) {
2e1614f7 1395 bt_dev_err(hcon->hdev, "Unable to create ECDH crypto context");
47eb2ac8 1396 goto free_shash;
407cecf6
JH		 1397 }
1398
8aab4757 1399 smp->conn = conn;
5d88cc73 1400 chan->data = smp;
8aab4757 1401
b28b4943
JH		 1402 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL);
1403
b68fda68
JH		 1404 INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
1405
2e1614f7 1406 hci_conn_hold(hcon);
8aab4757
VCG		 1407
1408 return smp;
47eb2ac8
TA		 1409
1410free_shash:
1411 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 1412zfree_smp:
453431a5 1413 kfree_sensitive(smp);
47eb2ac8 1414 return NULL;
8aab4757
VCG		 1415}
1416
760b018b
JH		 1417static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16])
1418{
1419 struct hci_conn *hcon = smp->conn->hcon;
1420 u8 *na, *nb, a[7], b[7];
1421
1422 if (hcon->out) {
1423 na = smp->prnd;
1424 nb = smp->rrnd;
1425 } else {
1426 na = smp->rrnd;
1427 nb = smp->prnd;
1428 }
1429
1430 memcpy(a, &hcon->init_addr, 6);
1431 memcpy(b, &hcon->resp_addr, 6);
1432 a[6] = hcon->init_addr_type;
1433 b[6] = hcon->resp_addr_type;
1434
1435 return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk);
1436}
1437
38606f14 1438static void sc_dhkey_check(struct smp_chan *smp)
760b018b
JH		 1439{
1440 struct hci_conn *hcon = smp->conn->hcon;
1441 struct smp_cmd_dhkey_check check;
1442 u8 a[7], b[7], *local_addr, *remote_addr;
1443 u8 io_cap[3], r[16];
1444
760b018b
JH		 1445 memcpy(a, &hcon->init_addr, 6);
1446 memcpy(b, &hcon->resp_addr, 6);
1447 a[6] = hcon->init_addr_type;
1448 b[6] = hcon->resp_addr_type;
1449
1450 if (hcon->out) {
1451 local_addr = a;
1452 remote_addr = b;
1453 memcpy(io_cap, &smp->preq[1], 3);
1454 } else {
1455 local_addr = b;
1456 remote_addr = a;
1457 memcpy(io_cap, &smp->prsp[1], 3);
1458 }
1459
dddd3059
JH		 1460 memset(r, 0, sizeof(r));
1461
1462 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
38606f14 1463 put_unaligned_le32(hcon->passkey_notify, r);
760b018b 1464
a29b0733
JH		 1465 if (smp->method == REQ_OOB)
1466 memcpy(r, smp->rr, 16);
1467
760b018b
JH		 1468 smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
1469 local_addr, remote_addr, check.e);
1470
1471 smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check);
dddd3059
JH		 1472}
1473
38606f14
JH		 1474static u8 sc_passkey_send_confirm(struct smp_chan *smp)
1475{
1476 struct l2cap_conn *conn = smp->conn;
1477 struct hci_conn *hcon = conn->hcon;
1478 struct smp_cmd_pairing_confirm cfm;
1479 u8 r;
1480
1481 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1482 r |= 0x80;
1483
1484 get_random_bytes(smp->prnd, sizeof(smp->prnd));
1485
1486 if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r,
1487 cfm.confirm_val))
1488 return SMP_UNSPECIFIED;
1489
1490 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
1491
1492 return 0;
1493}
1494
1495static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op)
1496{
1497 struct l2cap_conn *conn = smp->conn;
1498 struct hci_conn *hcon = conn->hcon;
1499 struct hci_dev *hdev = hcon->hdev;
1500 u8 cfm[16], r;
1501
1502 /* Ignore the PDU if we've already done 20 rounds (0 - 19) */
1503 if (smp->passkey_round >= 20)
1504 return 0;
1505
1506 switch (smp_op) {
1507 case SMP_CMD_PAIRING_RANDOM:
1508 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1509 r |= 0x80;
1510
1511 if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
1512 smp->rrnd, r, cfm))
1513 return SMP_UNSPECIFIED;
1514
329d8230 1515 if (crypto_memneq(smp->pcnf, cfm, 16))
38606f14
JH		 1516 return SMP_CONFIRM_FAILED;
1517
1518 smp->passkey_round++;
1519
1520 if (smp->passkey_round == 20) {
1521 /* Generate MacKey and LTK */
1522 if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk))
1523 return SMP_UNSPECIFIED;
1524 }
1525
1526 /* The round is only complete when the initiator
1527 * receives pairing random.
1528 */
1529 if (!hcon->out) {
1530 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1531 sizeof(smp->prnd), smp->prnd);
d3e54a87 1532 if (smp->passkey_round == 20)
38606f14 1533 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
d3e54a87 1534 else
38606f14 1535 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
38606f14
JH		 1536 return 0;
1537 }
1538
1539 /* Start the next round */
1540 if (smp->passkey_round != 20)
1541 return sc_passkey_round(smp, 0);
1542
1543 /* Passkey rounds are complete - start DHKey Check */
1544 sc_dhkey_check(smp);
1545 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1546
1547 break;
1548
1549 case SMP_CMD_PAIRING_CONFIRM:
1550 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
1551 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
1552 return 0;
1553 }
1554
1555 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1556
1557 if (hcon->out) {
1558 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1559 sizeof(smp->prnd), smp->prnd);
1560 return 0;
1561 }
1562
1563 return sc_passkey_send_confirm(smp);
1564
1565 case SMP_CMD_PUBLIC_KEY:
1566 default:
1567 /* Initiating device starts the round */
1568 if (!hcon->out)
1569 return 0;
1570
2e1614f7
LAD		 1571 bt_dev_dbg(hdev, "Starting passkey round %u",
1572 smp->passkey_round + 1);
38606f14
JH		 1573
1574 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1575
1576 return sc_passkey_send_confirm(smp);
1577 }
1578
1579 return 0;
1580}
1581
dddd3059
JH		 1582static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey)
1583{
38606f14
JH		 1584 struct l2cap_conn *conn = smp->conn;
1585 struct hci_conn *hcon = conn->hcon;
1586 u8 smp_op;
1587
1588 clear_bit(SMP_FLAG_WAIT_USER, &smp->flags);
1589
dddd3059
JH		 1590 switch (mgmt_op) {
1591 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1592 smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED);
1593 return 0;
1594 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
1595 smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED);
1596 return 0;
38606f14
JH		 1597 case MGMT_OP_USER_PASSKEY_REPLY:
1598 hcon->passkey_notify = le32_to_cpu(passkey);
1599 smp->passkey_round = 0;
1600
1601 if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags))
1602 smp_op = SMP_CMD_PAIRING_CONFIRM;
1603 else
1604 smp_op = 0;
1605
1606 if (sc_passkey_round(smp, smp_op))
1607 return -EIO;
1608
1609 return 0;
dddd3059
JH		 1610 }
1611
d3e54a87
JH		 1612 /* Initiator sends DHKey check first */
1613 if (hcon->out) {
1614 sc_dhkey_check(smp);
1615 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1616 } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) {
1617 sc_dhkey_check(smp);
1618 sc_add_ltk(smp);
1619 }
760b018b
JH		 1620
1621 return 0;
1622}
1623
2b64d153
BG		 1624int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
1625{
b10e8017 1626 struct l2cap_conn *conn = hcon->l2cap_data;
5d88cc73 1627 struct l2cap_chan *chan;
2b64d153
BG		 1628 struct smp_chan *smp;
1629 u32 value;
fc75cc86 1630 int err;
2b64d153 1631
fc75cc86 1632 if (!conn)
2b64d153
BG		 1633 return -ENOTCONN;
1634
0ae8ef67
LAD		 1635 bt_dev_dbg(conn->hcon->hdev, "");
1636
5d88cc73
JH		 1637 chan = conn->smp;
1638 if (!chan)
1639 return -ENOTCONN;
1640
fc75cc86
JH		 1641 l2cap_chan_lock(chan);
1642 if (!chan->data) {
1643 err = -ENOTCONN;
1644 goto unlock;
1645 }
1646
5d88cc73 1647 smp = chan->data;
2b64d153 1648
760b018b
JH		 1649 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1650 err = sc_user_reply(smp, mgmt_op, passkey);
1651 goto unlock;
1652 }
1653
2b64d153
BG		 1654 switch (mgmt_op) {
1655 case MGMT_OP_USER_PASSKEY_REPLY:
1656 value = le32_to_cpu(passkey);
943a732a 1657 memset(smp->tk, 0, sizeof(smp->tk));
83b4b195 1658 bt_dev_dbg(conn->hcon->hdev, "PassKey: %u", value);
943a732a 1659 put_unaligned_le32(value, smp->tk);
19186c7b 1660 fallthrough;
2b64d153 1661 case MGMT_OP_USER_CONFIRM_REPLY:
4a74d658 1662 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 1663 break;
1664 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1665 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
84794e11 1666 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1667 err = 0;
1668 goto unlock;
2b64d153 1669 default:
84794e11 1670 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1671 err = -EOPNOTSUPP;
1672 goto unlock;
2b64d153
BG		 1673 }
1674
fc75cc86
JH		 1675 err = 0;
1676
2b64d153 1677 /* If it is our turn to send Pairing Confirm, do so now */
1cc61144
JH		 1678 if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
1679 u8 rsp = smp_confirm(smp);
1680 if (rsp)
1681 smp_failure(conn, rsp);
1682 }
2b64d153 1683
fc75cc86
JH		 1684unlock:
1685 l2cap_chan_unlock(chan);
1686 return err;
2b64d153
BG		 1687}
1688
b5ae344d
JH		 1689static void build_bredr_pairing_cmd(struct smp_chan *smp,
1690 struct smp_cmd_pairing *req,
1691 struct smp_cmd_pairing *rsp)
1692{
1693 struct l2cap_conn *conn = smp->conn;
1694 struct hci_dev *hdev = conn->hcon->hdev;
1695 u8 local_dist = 0, remote_dist = 0;
1696
d7a5a11d 1697 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
b5ae344d
JH		 1698 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1699 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1700 }
1701
d7a5a11d 1702 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
b5ae344d
JH		 1703 remote_dist |= SMP_DIST_ID_KEY;
1704
d7a5a11d 1705 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
b5ae344d
JH		 1706 local_dist |= SMP_DIST_ID_KEY;
1707
1708 if (!rsp) {
1709 memset(req, 0, sizeof(*req));
1710
a62da6f1 1711 req->auth_req = SMP_AUTH_CT2;
b5ae344d
JH		 1712 req->init_key_dist = local_dist;
1713 req->resp_key_dist = remote_dist;
e3f6a257 1714 req->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1715
1716 smp->remote_key_dist = remote_dist;
1717
1718 return;
1719 }
1720
1721 memset(rsp, 0, sizeof(*rsp));
1722
a62da6f1 1723 rsp->auth_req = SMP_AUTH_CT2;
e3f6a257 1724 rsp->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1725 rsp->init_key_dist = req->init_key_dist & remote_dist;
1726 rsp->resp_key_dist = req->resp_key_dist & local_dist;
1727
1728 smp->remote_key_dist = rsp->init_key_dist;
1729}
1730
da85e5e5 1731static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1732{
3158c50c 1733 struct smp_cmd_pairing rsp, *req = (void *) skb->data;
fc75cc86 1734 struct l2cap_chan *chan = conn->smp;
b3c6410b 1735 struct hci_dev *hdev = conn->hcon->hdev;
8aab4757 1736 struct smp_chan *smp;
c7262e71 1737 u8 key_size, auth, sec_level;
8aab4757 1738 int ret;
88ba43b6 1739
2e1614f7 1740 bt_dev_dbg(hdev, "conn %p", conn);
88ba43b6 1741
c46b98be 1742 if (skb->len < sizeof(*req))
38e4a915 1743 return SMP_INVALID_PARAMS;
c46b98be 1744
40bef302 1745 if (conn->hcon->role != HCI_ROLE_SLAVE)
2b64d153
BG		 1746 return SMP_CMD_NOTSUPP;
1747
fc75cc86 1748 if (!chan->data)
8aab4757 1749 smp = smp_chan_create(conn);
fc75cc86 1750 else
5d88cc73 1751 smp = chan->data;
8aab4757 1752
d08fd0e7
AE		 1753 if (!smp)
1754 return SMP_UNSPECIFIED;
d26a2345 1755
c05b9339 1756 /* We didn't start the pairing, so match remote */
0edb14de 1757 auth = req->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1758
d7a5a11d 1759 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 1760 (auth & SMP_AUTH_BONDING))
b3c6410b
JH		 1761 return SMP_PAIRING_NOTSUPP;
1762
d7a5a11d 1763 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1764 return SMP_AUTH_REQUIREMENTS;
1765
1c1def09
VCG		 1766 smp->preq[0] = SMP_CMD_PAIRING_REQ;
1767 memcpy(&smp->preq[1], req, sizeof(*req));
3158c50c 1768 skb_pull(skb, sizeof(*req));
88ba43b6 1769
cb06d366
JH		 1770 /* If the remote side's OOB flag is set it means it has
1771 * successfully received our local OOB data - therefore set the
1772 * flag to indicate that local OOB is in use.
1773 */
94f14e47 1774 if (req->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob)
58428563
JH		 1775 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1776
b5ae344d
JH		 1777 /* SMP over BR/EDR requires special treatment */
1778 if (conn->hcon->type == ACL_LINK) {
1779 /* We must have a BR/EDR SC link */
08f63cc5 1780 if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) &&
b7cb93e5 1781 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 1782 return SMP_CROSS_TRANSP_NOT_ALLOWED;
1783
1784 set_bit(SMP_FLAG_SC, &smp->flags);
1785
1786 build_bredr_pairing_cmd(smp, req, &rsp);
1787
a62da6f1
JH		 1788 if (req->auth_req & SMP_AUTH_CT2)
1789 set_bit(SMP_FLAG_CT2, &smp->flags);
1790
b5ae344d
JH		 1791 key_size = min(req->max_key_size, rsp.max_key_size);
1792 if (check_enc_key_size(conn, key_size))
1793 return SMP_ENC_KEY_SIZE;
1794
1795 /* Clear bits which are generated but not distributed */
1796 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1797
1798 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1799 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
1800 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
1801
1802 smp_distribute_keys(smp);
1803 return 0;
1804 }
1805
5e3d3d9b
JH		 1806 build_pairing_cmd(conn, req, &rsp, auth);
1807
a62da6f1 1808 if (rsp.auth_req & SMP_AUTH_SC) {
5e3d3d9b
JH		 1809 set_bit(SMP_FLAG_SC, &smp->flags);
1810
a62da6f1
JH		 1811 if (rsp.auth_req & SMP_AUTH_CT2)
1812 set_bit(SMP_FLAG_CT2, &smp->flags);
1813 }
1814
5be5e275 1815 if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 1816 sec_level = BT_SECURITY_MEDIUM;
1817 else
1818 sec_level = authreq_to_seclevel(auth);
1819
c7262e71
JH		 1820 if (sec_level > conn->hcon->pending_sec_level)
1821 conn->hcon->pending_sec_level = sec_level;
fdde0a26 1822
49c922bb 1823 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1824 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1825 u8 method;
1826
1827 method = get_auth_method(smp, conn->hcon->io_capability,
1828 req->io_capability);
1829 if (method == JUST_WORKS || method == JUST_CFM)
1830 return SMP_AUTH_REQUIREMENTS;
1831 }
1832
3158c50c
VCG		 1833 key_size = min(req->max_key_size, rsp.max_key_size);
1834 if (check_enc_key_size(conn, key_size))
1835 return SMP_ENC_KEY_SIZE;
88ba43b6 1836
e84a6b13 1837 get_random_bytes(smp->prnd, sizeof(smp->prnd));
8aab4757 1838
1c1def09
VCG		 1839 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1840 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
f01ead31 1841
3158c50c 1842 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
3b19146d
JH		 1843
1844 clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
1845
19c5ce9c
JH		 1846 /* Strictly speaking we shouldn't allow Pairing Confirm for the
1847 * SC case, however some implementations incorrectly copy RFU auth
1848 * req bits from our security request, which may create a false
1849 * positive SC enablement.
1850 */
1851 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1852
3b19146d
JH		 1853 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1854 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1855 /* Clear bits which are generated but not distributed */
1856 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1857 /* Wait for Public Key from Initiating Device */
1858 return 0;
3b19146d 1859 }
da85e5e5 1860
2b64d153
BG		 1861 /* Request setup of TK */
1862 ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
1863 if (ret)
1864 return SMP_UNSPECIFIED;
1865
da85e5e5 1866 return 0;
88ba43b6
AB		 1867}
1868
3b19146d
JH		 1869static u8 sc_send_public_key(struct smp_chan *smp)
1870{
70157ef5
JH		 1871 struct hci_dev *hdev = smp->conn->hcon->hdev;
1872
56860245 1873 bt_dev_dbg(hdev, "");
3b19146d 1874
1a8bab4f 1875 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
33d0c030
MH		 1876 struct l2cap_chan *chan = hdev->smp_data;
1877 struct smp_dev *smp_dev;
1878
1879 if (!chan || !chan->data)
1880 return SMP_UNSPECIFIED;
1881
1882 smp_dev = chan->data;
1883
1884 memcpy(smp->local_pk, smp_dev->local_pk, 64);
fb334fee 1885 memcpy(smp->lr, smp_dev->local_rand, 16);
33d0c030
MH		 1886
1887 if (smp_dev->debug_key)
1888 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1889
1890 goto done;
1891 }
1892
d7a5a11d 1893 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
2e1614f7 1894 bt_dev_dbg(hdev, "Using debug keys");
c0153b0b
TA		 1895 if (set_ecdh_privkey(smp->tfm_ecdh, debug_sk))
1896 return SMP_UNSPECIFIED;
70157ef5 1897 memcpy(smp->local_pk, debug_pk, 64);
70157ef5
JH		 1898 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1899 } else {
1900 while (true) {
c0153b0b
TA		 1901 /* Generate key pair for Secure Connections */
1902 if (generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk))
70157ef5 1903 return SMP_UNSPECIFIED;
6c0dcc50 1904
70157ef5 1905 /* This is unlikely, but we need to check that
91641b79 1906 * we didn't accidentally generate a debug key.
70157ef5 1907 */
c0153b0b 1908 if (crypto_memneq(smp->local_pk, debug_pk, 64))
70157ef5
JH		 1909 break;
1910 }
6c0dcc50 1911 }
3b19146d 1912
33d0c030 1913done:
c7a3d57d 1914 SMP_DBG("Local Public Key X: %32phN", smp->local_pk);
8e4e2ee5 1915 SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32);
3b19146d
JH		 1916
1917 smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk);
1918
1919 return 0;
1920}
1921
da85e5e5 1922static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1923{
3158c50c 1924 struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
5d88cc73
JH		 1925 struct l2cap_chan *chan = conn->smp;
1926 struct smp_chan *smp = chan->data;
0edb14de 1927 struct hci_dev *hdev = conn->hcon->hdev;
3a7dbfb8 1928 u8 key_size, auth;
7d24ddcc 1929 int ret;
88ba43b6 1930
2e1614f7 1931 bt_dev_dbg(hdev, "conn %p", conn);
88ba43b6 1932
c46b98be 1933 if (skb->len < sizeof(*rsp))
38e4a915 1934 return SMP_INVALID_PARAMS;
c46b98be 1935
40bef302 1936 if (conn->hcon->role != HCI_ROLE_MASTER)
2b64d153
BG		 1937 return SMP_CMD_NOTSUPP;
1938
3158c50c
VCG		 1939 skb_pull(skb, sizeof(*rsp));
1940
1c1def09 1941 req = (void *) &smp->preq[1];
da85e5e5 1942
3158c50c
VCG		 1943 key_size = min(req->max_key_size, rsp->max_key_size);
1944 if (check_enc_key_size(conn, key_size))
1945 return SMP_ENC_KEY_SIZE;
1946
0edb14de 1947 auth = rsp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1948
d7a5a11d 1949 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1950 return SMP_AUTH_REQUIREMENTS;
1951
cb06d366
JH		 1952 /* If the remote side's OOB flag is set it means it has
1953 * successfully received our local OOB data - therefore set the
1954 * flag to indicate that local OOB is in use.
1955 */
94f14e47 1956 if (rsp->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob)
58428563
JH		 1957 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1958
b5ae344d
JH		 1959 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1960 memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
1961
1962 /* Update remote key distribution in case the remote cleared
1963 * some bits that we had enabled in our request.
1964 */
1965 smp->remote_key_dist &= rsp->resp_key_dist;
1966
a62da6f1
JH		 1967 if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2))
1968 set_bit(SMP_FLAG_CT2, &smp->flags);
1969
b5ae344d
JH		 1970 /* For BR/EDR this means we're done and can start phase 3 */
1971 if (conn->hcon->type == ACL_LINK) {
1972 /* Clear bits which are generated but not distributed */
1973 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1974 smp_distribute_keys(smp);
1975 return 0;
1976 }
1977
65668776
JH		 1978 if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC))
1979 set_bit(SMP_FLAG_SC, &smp->flags);
d2eb9e10
JH		 1980 else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH)
1981 conn->hcon->pending_sec_level = BT_SECURITY_HIGH;
65668776 1982
49c922bb 1983 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1984 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1985 u8 method;
1986
1987 method = get_auth_method(smp, req->io_capability,
1988 rsp->io_capability);
1989 if (method == JUST_WORKS || method == JUST_CFM)
1990 return SMP_AUTH_REQUIREMENTS;
1991 }
1992
e84a6b13 1993 get_random_bytes(smp->prnd, sizeof(smp->prnd));
7d24ddcc 1994
fdcc4bec
JH		 1995 /* Update remote key distribution in case the remote cleared
1996 * some bits that we had enabled in our request.
1997 */
1998 smp->remote_key_dist &= rsp->resp_key_dist;
1999
3b19146d
JH		 2000 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2001 /* Clear bits which are generated but not distributed */
2002 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
2003 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
2004 return sc_send_public_key(smp);
2005 }
2006
c05b9339 2007 auth |= req->auth_req;
2b64d153 2008
476585ec 2009 ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
2b64d153
BG		 2010 if (ret)
2011 return SMP_UNSPECIFIED;
2012
4a74d658 2013 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153
BG		 2014
2015 /* Can't compose response until we have been confirmed */
4a74d658 2016 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2017 return smp_confirm(smp);
da85e5e5
VCG		 2018
2019 return 0;
88ba43b6
AB		 2020}
2021
dcee2b32
JH		 2022static u8 sc_check_confirm(struct smp_chan *smp)
2023{
2024 struct l2cap_conn *conn = smp->conn;
2025
2e1614f7 2026 bt_dev_dbg(conn->hcon->hdev, "");
dcee2b32 2027
38606f14
JH		 2028 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2029 return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM);
2030
dcee2b32
JH		 2031 if (conn->hcon->out) {
2032 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2033 smp->prnd);
2034 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2035 }
2036
2037 return 0;
2038}
2039
19c5ce9c
JH		 2040/* Work-around for some implementations that incorrectly copy RFU bits
2041 * from our security request and thereby create the impression that
2042 * we're doing SC when in fact the remote doesn't support it.
2043 */
2044static int fixup_sc_false_positive(struct smp_chan *smp)
2045{
2046 struct l2cap_conn *conn = smp->conn;
2047 struct hci_conn *hcon = conn->hcon;
2048 struct hci_dev *hdev = hcon->hdev;
2049 struct smp_cmd_pairing *req, *rsp;
2050 u8 auth;
2051
fad646e1 2052 /* The issue is only observed when we're in responder role */
19c5ce9c
JH		 2053 if (hcon->out)
2054 return SMP_UNSPECIFIED;
2055
2056 if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) {
2064ee33 2057 bt_dev_err(hdev, "refusing legacy fallback in SC-only mode");
19c5ce9c
JH		 2058 return SMP_UNSPECIFIED;
2059 }
2060
2064ee33 2061 bt_dev_err(hdev, "trying to fall back to legacy SMP");
19c5ce9c
JH		 2062
2063 req = (void *) &smp->preq[1];
2064 rsp = (void *) &smp->prsp[1];
2065
2066 /* Rebuild key dist flags which may have been cleared for SC */
2067 smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist);
2068
2069 auth = req->auth_req & AUTH_REQ_MASK(hdev);
2070
2071 if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) {
2064ee33 2072 bt_dev_err(hdev, "failed to fall back to legacy SMP");
19c5ce9c
JH		 2073 return SMP_UNSPECIFIED;
2074 }
2075
2076 clear_bit(SMP_FLAG_SC, &smp->flags);
2077
2078 return 0;
2079}
2080
da85e5e5 2081static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2082{
5d88cc73
JH		 2083 struct l2cap_chan *chan = conn->smp;
2084 struct smp_chan *smp = chan->data;
2e1614f7
LAD		 2085 struct hci_conn *hcon = conn->hcon;
2086 struct hci_dev *hdev = hcon->hdev;
7d24ddcc 2087
fad646e1
AP		 2088 bt_dev_dbg(hdev, "conn %p %s", conn,
2089 hcon->out ? "initiator" : "responder");
88ba43b6 2090
c46b98be 2091 if (skb->len < sizeof(smp->pcnf))
38e4a915 2092 return SMP_INVALID_PARAMS;
c46b98be 2093
1c1def09
VCG		 2094 memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
2095 skb_pull(skb, sizeof(smp->pcnf));
88ba43b6 2096
19c5ce9c
JH		 2097 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2098 int ret;
2099
2100 /* Public Key exchange must happen before any other steps */
2101 if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags))
2102 return sc_check_confirm(smp);
2103
2e1614f7 2104 bt_dev_err(hdev, "Unexpected SMP Pairing Confirm");
19c5ce9c
JH		 2105
2106 ret = fixup_sc_false_positive(smp);
2107 if (ret)
2108 return ret;
2109 }
dcee2b32 2110
b28b4943 2111 if (conn->hcon->out) {
943a732a
JH		 2112 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2113 smp->prnd);
b28b4943
JH		 2114 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2115 return 0;
2116 }
2117
2118 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2119 return smp_confirm(smp);
983f9814
MH		 2120
2121 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
da85e5e5
VCG		 2122
2123 return 0;
88ba43b6
AB		 2124}
2125
da85e5e5 2126static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2127{
5d88cc73
JH		 2128 struct l2cap_chan *chan = conn->smp;
2129 struct smp_chan *smp = chan->data;
191dc7fe 2130 struct hci_conn *hcon = conn->hcon;
eed467b5 2131 u8 *pkax, *pkbx, *na, *nb, confirm_hint;
191dc7fe
JH		 2132 u32 passkey;
2133 int err;
7d24ddcc 2134
2e1614f7 2135 bt_dev_dbg(hcon->hdev, "conn %p", conn);
3158c50c 2136
c46b98be 2137 if (skb->len < sizeof(smp->rrnd))
38e4a915 2138 return SMP_INVALID_PARAMS;
c46b98be 2139
943a732a 2140 memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
8aab4757 2141 skb_pull(skb, sizeof(smp->rrnd));
e7e62c85 2142
191dc7fe
JH		 2143 if (!test_bit(SMP_FLAG_SC, &smp->flags))
2144 return smp_random(smp);
2145
580039e8
JH		 2146 if (hcon->out) {
2147 pkax = smp->local_pk;
2148 pkbx = smp->remote_pk;
2149 na = smp->prnd;
2150 nb = smp->rrnd;
2151 } else {
2152 pkax = smp->remote_pk;
2153 pkbx = smp->local_pk;
2154 na = smp->rrnd;
2155 nb = smp->prnd;
2156 }
2157
a29b0733
JH		 2158 if (smp->method == REQ_OOB) {
2159 if (!hcon->out)
2160 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2161 sizeof(smp->prnd), smp->prnd);
2162 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2163 goto mackey_and_ltk;
2164 }
2165
38606f14
JH		 2166 /* Passkey entry has special treatment */
2167 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2168 return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
2169
191dc7fe
JH		 2170 if (hcon->out) {
2171 u8 cfm[16];
2172
2173 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
2174 smp->rrnd, 0, cfm);
2175 if (err)
2176 return SMP_UNSPECIFIED;
2177
329d8230 2178 if (crypto_memneq(smp->pcnf, cfm, 16))
191dc7fe 2179 return SMP_CONFIRM_FAILED;
191dc7fe
JH		 2180 } else {
2181 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2182 smp->prnd);
2183 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
cee5f20f
HC		 2184
2185 /* Only Just-Works pairing requires extra checks */
2186 if (smp->method != JUST_WORKS)
2187 goto mackey_and_ltk;
2188
2189 /* If there already exists long term key in local host, leave
2190 * the decision to user space since the remote device could
2191 * be legitimate or malicious.
2192 */
2193 if (hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
2194 hcon->role)) {
eed467b5
HC		 2195 /* Set passkey to 0. The value can be any number since
2196 * it'll be ignored anyway.
2197 */
2198 passkey = 0;
2199 confirm_hint = 1;
2200 goto confirm;
cee5f20f 2201 }
191dc7fe
JH		 2202 }
2203
a29b0733 2204mackey_and_ltk:
760b018b
JH		 2205 /* Generate MacKey and LTK */
2206 err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
2207 if (err)
2208 return SMP_UNSPECIFIED;
2209
ffee202a 2210 if (smp->method == REQ_OOB) {
dddd3059 2211 if (hcon->out) {
38606f14 2212 sc_dhkey_check(smp);
dddd3059
JH		 2213 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2214 }
2215 return 0;
2216 }
2217
38606f14
JH		 2218 err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
2219 if (err)
2220 return SMP_UNSPECIFIED;
2221
eed467b5
HC		 2222 confirm_hint = 0;
2223
2224confirm:
ffee202a
SS		 2225 if (smp->method == JUST_WORKS)
2226 confirm_hint = 1;
2227
38606f14 2228 err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type,
eed467b5 2229 hcon->dst_type, passkey, confirm_hint);
191dc7fe
JH		 2230 if (err)
2231 return SMP_UNSPECIFIED;
2232
38606f14
JH		 2233 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2234
191dc7fe 2235 return 0;
88ba43b6
AB		 2236}
2237
f81cd823 2238static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
988c5997 2239{
c9839a11 2240 struct smp_ltk *key;
988c5997
VCG		 2241 struct hci_conn *hcon = conn->hcon;
2242
f3a73d97 2243 key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role);
988c5997 2244 if (!key)
f81cd823 2245 return false;
988c5997 2246
a6f7833c 2247 if (smp_ltk_sec_level(key) < sec_level)
f81cd823 2248 return false;
4dab7864 2249
51a8efd7 2250 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
f81cd823 2251 return true;
988c5997 2252
8b76ce34 2253 hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size);
c9839a11 2254 hcon->enc_key_size = key->enc_size;
988c5997 2255
fad646e1 2256 /* We never store STKs for initiator role, so clear this flag */
fe59a05f
JH		 2257 clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
2258
f81cd823 2259 return true;
988c5997 2260}
f1560463 2261
35dc6f83
JH		 2262bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
2263 enum smp_key_pref key_pref)
854f4727
JH		 2264{
2265 if (sec_level == BT_SECURITY_LOW)
2266 return true;
2267
35dc6f83
JH		 2268 /* If we're encrypted with an STK but the caller prefers using
2269 * LTK claim insufficient security. This way we allow the
2270 * connection to be re-encrypted with an LTK, even if the LTK
2271 * provides the same level of security. Only exception is if we
2272 * don't have an LTK (e.g. because of key distribution bits).
9ab65d60 2273 */
35dc6f83
JH		 2274 if (key_pref == SMP_USE_LTK &&
2275 test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
f3a73d97 2276 hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role))
9ab65d60
JH		 2277 return false;
2278
854f4727
JH		 2279 if (hcon->sec_level >= sec_level)
2280 return true;
2281
2282 return false;
2283}
2284
da85e5e5 2285static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6
AB		 2286{
2287 struct smp_cmd_security_req *rp = (void *) skb->data;
2288 struct smp_cmd_pairing cp;
f1cb9af5 2289 struct hci_conn *hcon = conn->hcon;
0edb14de 2290 struct hci_dev *hdev = hcon->hdev;
8aab4757 2291 struct smp_chan *smp;
c05b9339 2292 u8 sec_level, auth;
88ba43b6 2293
2e1614f7 2294 bt_dev_dbg(hdev, "conn %p", conn);
88ba43b6 2295
c46b98be 2296 if (skb->len < sizeof(*rp))
38e4a915 2297 return SMP_INVALID_PARAMS;
c46b98be 2298
40bef302 2299 if (hcon->role != HCI_ROLE_MASTER)
86ca9eac
JH		 2300 return SMP_CMD_NOTSUPP;
2301
0edb14de 2302 auth = rp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 2303
d7a5a11d 2304 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 2305 return SMP_AUTH_REQUIREMENTS;
2306
5be5e275 2307 if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 2308 sec_level = BT_SECURITY_MEDIUM;
2309 else
2310 sec_level = authreq_to_seclevel(auth);
2311
64e759f5
SJ		 2312 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) {
2313 /* If link is already encrypted with sufficient security we
2314 * still need refresh encryption as per Core Spec 5.0 Vol 3,
2315 * Part H 2.4.6
2316 */
2317 smp_ltk_encrypt(conn, hcon->sec_level);
854f4727 2318 return 0;
64e759f5 2319 }
854f4727 2320
c7262e71
JH		 2321 if (sec_level > hcon->pending_sec_level)
2322 hcon->pending_sec_level = sec_level;
feb45eb5 2323
4dab7864 2324 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
988c5997
VCG		 2325 return 0;
2326
8aab4757 2327 smp = smp_chan_create(conn);
c29d2444
JH		 2328 if (!smp)
2329 return SMP_UNSPECIFIED;
d26a2345 2330
d7a5a11d 2331 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 2332 (auth & SMP_AUTH_BONDING))
616d55be
JH		 2333 return SMP_PAIRING_NOTSUPP;
2334
88ba43b6 2335 skb_pull(skb, sizeof(*rp));
88ba43b6 2336
da85e5e5 2337 memset(&cp, 0, sizeof(cp));
c05b9339 2338 build_pairing_cmd(conn, &cp, NULL, auth);
88ba43b6 2339
1c1def09
VCG		 2340 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2341 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2342
88ba43b6 2343 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2344 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
f1cb9af5 2345
da85e5e5 2346 return 0;
88ba43b6
AB		 2347}
2348
cc110922 2349int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
eb492e01 2350{
cc110922 2351 struct l2cap_conn *conn = hcon->l2cap_data;
c68b7f12 2352 struct l2cap_chan *chan;
0a66cf20 2353 struct smp_chan *smp;
2b64d153 2354 __u8 authreq;
fc75cc86 2355 int ret;
eb492e01 2356
2e1614f7
LAD		 2357 bt_dev_dbg(hcon->hdev, "conn %p hcon %p level 0x%2.2x", conn, hcon,
2358 sec_level);
3a0259bb 2359
0a66cf20
JH		 2360 /* This may be NULL if there's an unexpected disconnection */
2361 if (!conn)
2362 return 1;
2363
d7a5a11d 2364 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED))
2e65c9d2
AG		 2365 return 1;
2366
35dc6f83 2367 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
eb492e01 2368 return 1;
f1cb9af5 2369
c7262e71
JH		 2370 if (sec_level > hcon->pending_sec_level)
2371 hcon->pending_sec_level = sec_level;
2372
40bef302 2373 if (hcon->role == HCI_ROLE_MASTER)
c7262e71
JH		 2374 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
2375 return 0;
d26a2345 2376
d8949aad
JH		 2377 chan = conn->smp;
2378 if (!chan) {
2064ee33 2379 bt_dev_err(hcon->hdev, "security requested but not available");
d8949aad
JH		 2380 return 1;
2381 }
2382
fc75cc86
JH		 2383 l2cap_chan_lock(chan);
2384
2385 /* If SMP is already in progress ignore this request */
2386 if (chan->data) {
2387 ret = 0;
2388 goto unlock;
2389 }
d26a2345 2390
8aab4757 2391 smp = smp_chan_create(conn);
fc75cc86
JH		 2392 if (!smp) {
2393 ret = 1;
2394 goto unlock;
2395 }
2b64d153
BG		 2396
2397 authreq = seclevel_to_authreq(sec_level);
d26a2345 2398
a62da6f1 2399 if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) {
d2eb9e10 2400 authreq |= SMP_AUTH_SC;
a62da6f1
JH		 2401 if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED))
2402 authreq |= SMP_AUTH_CT2;
2403 }
d2eb9e10 2404
c2aa30db
AP		 2405 /* Don't attempt to set MITM if setting is overridden by debugfs
2406 * Needed to pass certification test SM/MAS/PKE/BV-01-C
2e233644 2407 */
c2aa30db
AP		 2408 if (!hci_dev_test_flag(hcon->hdev, HCI_FORCE_NO_MITM)) {
2409 /* Require MITM if IO Capability allows or the security level
2410 * requires it.
2411 */
2412 if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
2413 hcon->pending_sec_level > BT_SECURITY_MEDIUM)
2414 authreq |= SMP_AUTH_MITM;
2415 }
2e233644 2416
40bef302 2417 if (hcon->role == HCI_ROLE_MASTER) {
d26a2345 2418 struct smp_cmd_pairing cp;
f01ead31 2419
2b64d153 2420 build_pairing_cmd(conn, &cp, NULL, authreq);
1c1def09
VCG		 2421 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2422 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2423
eb492e01 2424 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2425 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
eb492e01
AB		 2426 } else {
2427 struct smp_cmd_security_req cp;
2b64d153 2428 cp.auth_req = authreq;
eb492e01 2429 smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
b28b4943 2430 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ);
eb492e01
AB		 2431 }
2432
4a74d658 2433 set_bit(SMP_FLAG_INITIATOR, &smp->flags);
fc75cc86 2434 ret = 0;
edca792c 2435
fc75cc86
JH		 2436unlock:
2437 l2cap_chan_unlock(chan);
2438 return ret;
eb492e01
AB		 2439}
2440
cb28c306
MK		 2441int smp_cancel_and_remove_pairing(struct hci_dev *hdev, bdaddr_t *bdaddr,
2442 u8 addr_type)
c81d555a 2443{
cb28c306
MK		 2444 struct hci_conn *hcon;
2445 struct l2cap_conn *conn;
c81d555a
JH		 2446 struct l2cap_chan *chan;
2447 struct smp_chan *smp;
cb28c306
MK		 2448 int err;
2449
2450 err = hci_remove_ltk(hdev, bdaddr, addr_type);
2451 hci_remove_irk(hdev, bdaddr, addr_type);
2452
2453 hcon = hci_conn_hash_lookup_le(hdev, bdaddr, addr_type);
2454 if (!hcon)
2455 goto done;
c81d555a 2456
cb28c306 2457 conn = hcon->l2cap_data;
c81d555a 2458 if (!conn)
cb28c306 2459 goto done;
c81d555a
JH		 2460
2461 chan = conn->smp;
2462 if (!chan)
cb28c306 2463 goto done;
c81d555a
JH		 2464
2465 l2cap_chan_lock(chan);
2466
2467 smp = chan->data;
2468 if (smp) {
cb28c306
MK		 2469 /* Set keys to NULL to make sure smp_failure() does not try to
2470 * remove and free already invalidated rcu list entries. */
2471 smp->ltk = NULL;
fad646e1 2472 smp->responder_ltk = NULL;
cb28c306
MK		 2473 smp->remote_irk = NULL;
2474
c81d555a
JH		 2475 if (test_bit(SMP_FLAG_COMPLETE, &smp->flags))
2476 smp_failure(conn, 0);
2477 else
2478 smp_failure(conn, SMP_UNSPECIFIED);
cb28c306 2479 err = 0;
c81d555a
JH		 2480 }
2481
2482 l2cap_chan_unlock(chan);
cb28c306
MK		 2483
2484done:
2485 return err;
c81d555a
JH		 2486}
2487
7034b911
VCG		 2488static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
2489{
16b90839 2490 struct smp_cmd_encrypt_info *rp = (void *) skb->data;
5d88cc73
JH		 2491 struct l2cap_chan *chan = conn->smp;
2492 struct smp_chan *smp = chan->data;
16b90839 2493
2e1614f7 2494 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
c46b98be
JH		 2495
2496 if (skb->len < sizeof(*rp))
38e4a915 2497 return SMP_INVALID_PARAMS;
c46b98be 2498
600a8749
AM		 2499 /* Pairing is aborted if any blocked keys are distributed */
2500 if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_LTK,
2501 rp->ltk)) {
2502 bt_dev_warn_ratelimited(conn->hcon->hdev,
2503 "LTK blocked for %pMR",
2504 &conn->hcon->dst);
2505 return SMP_INVALID_PARAMS;
2506 }
2507
fad646e1 2508 SMP_ALLOW_CMD(smp, SMP_CMD_INITIATOR_IDENT);
6131ddc8 2509
16b90839
VCG		 2510 skb_pull(skb, sizeof(*rp));
2511
1c1def09 2512 memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
16b90839 2513
7034b911
VCG		 2514 return 0;
2515}
2516
fad646e1 2517static int smp_cmd_initiator_ident(struct l2cap_conn *conn, struct sk_buff *skb)
7034b911 2518{
fad646e1 2519 struct smp_cmd_initiator_ident *rp = (void *)skb->data;
5d88cc73
JH		 2520 struct l2cap_chan *chan = conn->smp;
2521 struct smp_chan *smp = chan->data;
c9839a11
VCG		 2522 struct hci_dev *hdev = conn->hcon->hdev;
2523 struct hci_conn *hcon = conn->hcon;
23d0e128 2524 struct smp_ltk *ltk;
c9839a11 2525 u8 authenticated;
16b90839 2526
2e1614f7 2527 bt_dev_dbg(hdev, "conn %p", conn);
c46b98be
JH		 2528
2529 if (skb->len < sizeof(*rp))
38e4a915 2530 return SMP_INVALID_PARAMS;
c46b98be 2531
9747a9f3
JH		 2532 /* Mark the information as received */
2533 smp->remote_key_dist &= ~SMP_DIST_ENC_KEY;
2534
b28b4943
JH		 2535 if (smp->remote_key_dist & SMP_DIST_ID_KEY)
2536 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
196332f5
JH		 2537 else if (smp->remote_key_dist & SMP_DIST_SIGN)
2538 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
b28b4943 2539
16b90839 2540 skb_pull(skb, sizeof(*rp));
7034b911 2541
ce39fb4e 2542 authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
2ceba539 2543 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
23d0e128
JH		 2544 authenticated, smp->tk, smp->enc_key_size,
2545 rp->ediv, rp->rand);
2546 smp->ltk = ltk;
c6e81e9a 2547 if (!(smp->remote_key_dist & KEY_DIST_MASK))
d6268e86 2548 smp_distribute_keys(smp);
7034b911
VCG		 2549
2550 return 0;
2551}
2552
fd349c02
JH		 2553static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
2554{
2555 struct smp_cmd_ident_info *info = (void *) skb->data;
5d88cc73
JH		 2556 struct l2cap_chan *chan = conn->smp;
2557 struct smp_chan *smp = chan->data;
fd349c02 2558
2e1614f7 2559 bt_dev_dbg(conn->hcon->hdev, "");
fd349c02
JH		 2560
2561 if (skb->len < sizeof(*info))
38e4a915 2562 return SMP_INVALID_PARAMS;
fd349c02 2563
600a8749
AM		 2564 /* Pairing is aborted if any blocked keys are distributed */
2565 if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_IRK,
2566 info->irk)) {
2567 bt_dev_warn_ratelimited(conn->hcon->hdev,
2568 "Identity key blocked for %pMR",
2569 &conn->hcon->dst);
2570 return SMP_INVALID_PARAMS;
2571 }
2572
b28b4943 2573 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO);
6131ddc8 2574
fd349c02
JH		 2575 skb_pull(skb, sizeof(*info));
2576
2577 memcpy(smp->irk, info->irk, 16);
2578
2579 return 0;
2580}
2581
2582static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
2583 struct sk_buff *skb)
2584{
2585 struct smp_cmd_ident_addr_info *info = (void *) skb->data;
5d88cc73
JH		 2586 struct l2cap_chan *chan = conn->smp;
2587 struct smp_chan *smp = chan->data;
fd349c02
JH		 2588 struct hci_conn *hcon = conn->hcon;
2589 bdaddr_t rpa;
2590
2e1614f7 2591 bt_dev_dbg(hcon->hdev, "");
fd349c02
JH		 2592
2593 if (skb->len < sizeof(*info))
38e4a915 2594 return SMP_INVALID_PARAMS;
fd349c02 2595
9747a9f3
JH		 2596 /* Mark the information as received */
2597 smp->remote_key_dist &= ~SMP_DIST_ID_KEY;
2598
b28b4943
JH		 2599 if (smp->remote_key_dist & SMP_DIST_SIGN)
2600 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
2601
fd349c02
JH		 2602 skb_pull(skb, sizeof(*info));
2603
a9a58f86
JH		 2604 /* Strictly speaking the Core Specification (4.1) allows sending
2605 * an empty address which would force us to rely on just the IRK
2606 * as "identity information". However, since such
2607 * implementations are not known of and in order to not over
2608 * complicate our implementation, simply pretend that we never
2609 * received an IRK for such a device.
e12af489
JH		 2610 *
2611 * The Identity Address must also be a Static Random or Public
2612 * Address, which hci_is_identity_address() checks for.
a9a58f86 2613 */
e12af489
JH		 2614 if (!bacmp(&info->bdaddr, BDADDR_ANY) ||
2615 !hci_is_identity_address(&info->bdaddr, info->addr_type)) {
2064ee33 2616 bt_dev_err(hcon->hdev, "ignoring IRK with no identity address");
31dd624e 2617 goto distribute;
a9a58f86
JH		 2618 }
2619
1d87b88b
SJ		 2620 /* Drop IRK if peer is using identity address during pairing but is
2621 * providing different address as identity information.
2622 *
2623 * Microsoft Surface Precision Mouse is known to have this bug.
2624 */
2625 if (hci_is_identity_address(&hcon->dst, hcon->dst_type) &&
2626 (bacmp(&info->bdaddr, &hcon->dst) ||
2627 info->addr_type != hcon->dst_type)) {
2628 bt_dev_err(hcon->hdev,
2629 "ignoring IRK with invalid identity address");
2630 goto distribute;
2631 }
2632
fd349c02
JH		 2633 bacpy(&smp->id_addr, &info->bdaddr);
2634 smp->id_addr_type = info->addr_type;
2635
2636 if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type))
2637 bacpy(&rpa, &hcon->dst);
2638 else
2639 bacpy(&rpa, BDADDR_ANY);
2640
23d0e128
JH		 2641 smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr,
2642 smp->id_addr_type, smp->irk, &rpa);
fd349c02 2643
31dd624e 2644distribute:
c6e81e9a
JH		 2645 if (!(smp->remote_key_dist & KEY_DIST_MASK))
2646 smp_distribute_keys(smp);
fd349c02
JH		 2647
2648 return 0;
2649}
2650
7ee4ea36
MH		 2651static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
2652{
2653 struct smp_cmd_sign_info *rp = (void *) skb->data;
5d88cc73
JH		 2654 struct l2cap_chan *chan = conn->smp;
2655 struct smp_chan *smp = chan->data;
7ee4ea36
MH		 2656 struct smp_csrk *csrk;
2657
2e1614f7 2658 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
7ee4ea36
MH		 2659
2660 if (skb->len < sizeof(*rp))
38e4a915 2661 return SMP_INVALID_PARAMS;
7ee4ea36 2662
7ee4ea36
MH		 2663 /* Mark the information as received */
2664 smp->remote_key_dist &= ~SMP_DIST_SIGN;
2665
2666 skb_pull(skb, sizeof(*rp));
2667
7ee4ea36
MH		 2668 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
2669 if (csrk) {
4cd3928a
JH		 2670 if (conn->hcon->sec_level > BT_SECURITY_MEDIUM)
2671 csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED;
2672 else
2673 csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED;
7ee4ea36
MH		 2674 memcpy(csrk->val, rp->csrk, sizeof(csrk->val));
2675 }
2676 smp->csrk = csrk;
d6268e86 2677 smp_distribute_keys(smp);
7ee4ea36
MH		 2678
2679 return 0;
2680}
2681
5e3d3d9b
JH		 2682static u8 sc_select_method(struct smp_chan *smp)
2683{
2684 struct l2cap_conn *conn = smp->conn;
2685 struct hci_conn *hcon = conn->hcon;
2686 struct smp_cmd_pairing *local, *remote;
2687 u8 local_mitm, remote_mitm, local_io, remote_io, method;
2688
1a8bab4f
JH		 2689 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) ||
2690 test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags))
a29b0733
JH		 2691 return REQ_OOB;
2692
5e3d3d9b
JH		 2693 /* The preq/prsp contain the raw Pairing Request/Response PDUs
2694 * which are needed as inputs to some crypto functions. To get
2695 * the "struct smp_cmd_pairing" from them we need to skip the
2696 * first byte which contains the opcode.
2697 */
2698 if (hcon->out) {
2699 local = (void *) &smp->preq[1];
2700 remote = (void *) &smp->prsp[1];
2701 } else {
2702 local = (void *) &smp->prsp[1];
2703 remote = (void *) &smp->preq[1];
2704 }
2705
2706 local_io = local->io_capability;
2707 remote_io = remote->io_capability;
2708
2709 local_mitm = (local->auth_req & SMP_AUTH_MITM);
2710 remote_mitm = (remote->auth_req & SMP_AUTH_MITM);
2711
2712 /* If either side wants MITM, look up the method from the table,
2713 * otherwise use JUST WORKS.
2714 */
2715 if (local_mitm || remote_mitm)
2716 method = get_auth_method(smp, local_io, remote_io);
2717 else
2718 method = JUST_WORKS;
2719
2720 /* Don't confirm locally initiated pairing attempts */
2721 if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
2722 method = JUST_WORKS;
2723
2724 return method;
2725}
2726
d8f8edbe
JH		 2727static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
2728{
2729 struct smp_cmd_public_key *key = (void *) skb->data;
2730 struct hci_conn *hcon = conn->hcon;
2731 struct l2cap_chan *chan = conn->smp;
2732 struct smp_chan *smp = chan->data;
5e3d3d9b 2733 struct hci_dev *hdev = hcon->hdev;
c0153b0b 2734 struct crypto_kpp *tfm_ecdh;
cbbbe3e2 2735 struct smp_cmd_pairing_confirm cfm;
d8f8edbe
JH		 2736 int err;
2737
2e1614f7 2738 bt_dev_dbg(hdev, "conn %p", conn);
d8f8edbe
JH		 2739
2740 if (skb->len < sizeof(*key))
2741 return SMP_INVALID_PARAMS;
2742
6d19628f
LAD		 2743 /* Check if remote and local public keys are the same and debug key is
2744 * not in use.
2745 */
2746 if (!test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags) &&
2747 !crypto_memneq(key, smp->local_pk, 64)) {
2748 bt_dev_err(hdev, "Remote and local public keys are identical");
2749 return SMP_UNSPECIFIED;
2750 }
2751
d8f8edbe
JH		 2752 memcpy(smp->remote_pk, key, 64);
2753
a8ca617c
JH		 2754 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {
2755 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
2756 smp->rr, 0, cfm.confirm_val);
2757 if (err)
2758 return SMP_UNSPECIFIED;
2759
329d8230 2760 if (crypto_memneq(cfm.confirm_val, smp->pcnf, 16))
a8ca617c
JH		 2761 return SMP_CONFIRM_FAILED;
2762 }
2763
d8f8edbe
JH		 2764 /* Non-initiating device sends its public key after receiving
2765 * the key from the initiating device.
2766 */
2767 if (!hcon->out) {
2768 err = sc_send_public_key(smp);
2769 if (err)
2770 return err;
2771 }
2772
c7a3d57d 2773 SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk);
e091526d 2774 SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32);
d8f8edbe 2775
c0153b0b
TA		 2776 /* Compute the shared secret on the same crypto tfm on which the private
2777 * key was set/generated.
2778 */
2779 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
4ba5175f
MK		 2780 struct l2cap_chan *hchan = hdev->smp_data;
2781 struct smp_dev *smp_dev;
2782
2783 if (!hchan || !hchan->data)
2784 return SMP_UNSPECIFIED;
2785
2786 smp_dev = hchan->data;
c0153b0b
TA		 2787
2788 tfm_ecdh = smp_dev->tfm_ecdh;
2789 } else {
2790 tfm_ecdh = smp->tfm_ecdh;
2791 }
2792
2793 if (compute_ecdh_secret(tfm_ecdh, smp->remote_pk, smp->dhkey))
d8f8edbe
JH		 2794 return SMP_UNSPECIFIED;
2795
c7a3d57d 2796 SMP_DBG("DHKey %32phN", smp->dhkey);
d8f8edbe
JH		 2797
2798 set_bit(SMP_FLAG_REMOTE_PK, &smp->flags);
2799
5e3d3d9b
JH		 2800 smp->method = sc_select_method(smp);
2801
2e1614f7 2802 bt_dev_dbg(hdev, "selected method 0x%02x", smp->method);
5e3d3d9b
JH		 2803
2804 /* JUST_WORKS and JUST_CFM result in an unauthenticated key */
2805 if (smp->method == JUST_WORKS || smp->method == JUST_CFM)
2806 hcon->pending_sec_level = BT_SECURITY_MEDIUM;
2807 else
2808 hcon->pending_sec_level = BT_SECURITY_FIPS;
2809
329d8230 2810 if (!crypto_memneq(debug_pk, smp->remote_pk, 64))
aeb7d461
JH		 2811 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
2812
38606f14
JH		 2813 if (smp->method == DSP_PASSKEY) {
2814 get_random_bytes(&hcon->passkey_notify,
2815 sizeof(hcon->passkey_notify));
2816 hcon->passkey_notify %= 1000000;
2817 hcon->passkey_entered = 0;
2818 smp->passkey_round = 0;
2819 if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type,
2820 hcon->dst_type,
2821 hcon->passkey_notify,
2822 hcon->passkey_entered))
2823 return SMP_UNSPECIFIED;
2824 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2825 return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
2826 }
2827
94ea7257 2828 if (smp->method == REQ_OOB) {
a29b0733
JH		 2829 if (hcon->out)
2830 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2831 sizeof(smp->prnd), smp->prnd);
2832
2833 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2834
2835 return 0;
2836 }
2837
38606f14
JH		 2838 if (hcon->out)
2839 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2840
2841 if (smp->method == REQ_PASSKEY) {
2842 if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type,
2843 hcon->dst_type))
2844 return SMP_UNSPECIFIED;
2845 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2846 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2847 return 0;
2848 }
2849
cbbbe3e2
JH		 2850 /* The Initiating device waits for the non-initiating device to
2851 * send the confirm value.
2852 */
2853 if (conn->hcon->out)
2854 return 0;
2855
2856 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd,
2857 0, cfm.confirm_val);
2858 if (err)
2859 return SMP_UNSPECIFIED;
2860
2861 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
2862 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2863
d8f8edbe
JH		 2864 return 0;
2865}
2866
6433a9a2
JH		 2867static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb)
2868{
2869 struct smp_cmd_dhkey_check *check = (void *) skb->data;
2870 struct l2cap_chan *chan = conn->smp;
2871 struct hci_conn *hcon = conn->hcon;
2872 struct smp_chan *smp = chan->data;
2873 u8 a[7], b[7], *local_addr, *remote_addr;
2874 u8 io_cap[3], r[16], e[16];
2875 int err;
2876
2e1614f7 2877 bt_dev_dbg(hcon->hdev, "conn %p", conn);
6433a9a2
JH		 2878
2879 if (skb->len < sizeof(*check))
2880 return SMP_INVALID_PARAMS;
2881
2882 memcpy(a, &hcon->init_addr, 6);
2883 memcpy(b, &hcon->resp_addr, 6);
2884 a[6] = hcon->init_addr_type;
2885 b[6] = hcon->resp_addr_type;
2886
2887 if (hcon->out) {
2888 local_addr = a;
2889 remote_addr = b;
2890 memcpy(io_cap, &smp->prsp[1], 3);
2891 } else {
2892 local_addr = b;
2893 remote_addr = a;
2894 memcpy(io_cap, &smp->preq[1], 3);
2895 }
2896
2897 memset(r, 0, sizeof(r));
2898
38606f14
JH		 2899 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2900 put_unaligned_le32(hcon->passkey_notify, r);
882fafad
JH		 2901 else if (smp->method == REQ_OOB)
2902 memcpy(r, smp->lr, 16);
38606f14 2903
6433a9a2
JH		 2904 err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r,
2905 io_cap, remote_addr, local_addr, e);
2906 if (err)
2907 return SMP_UNSPECIFIED;
2908
329d8230 2909 if (crypto_memneq(check->e, e, 16))
6433a9a2
JH		 2910 return SMP_DHKEY_CHECK_FAILED;
2911
d3e54a87
JH		 2912 if (!hcon->out) {
2913 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
2914 set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags);
2915 return 0;
2916 }
d378a2d7 2917
fad646e1 2918 /* Responder sends DHKey check as response to initiator */
d3e54a87
JH		 2919 sc_dhkey_check(smp);
2920 }
d378a2d7 2921
d3e54a87 2922 sc_add_ltk(smp);
6433a9a2
JH		 2923
2924 if (hcon->out) {
8b76ce34 2925 hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size);
6433a9a2
JH		 2926 hcon->enc_key_size = smp->enc_key_size;
2927 }
2928
2929 return 0;
2930}
2931
1408bb6e
JH		 2932static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
2933 struct sk_buff *skb)
2934{
2935 struct smp_cmd_keypress_notify *kp = (void *) skb->data;
2936
2e1614f7 2937 bt_dev_dbg(conn->hcon->hdev, "value 0x%02x", kp->value);
1408bb6e
JH		 2938
2939 return 0;
2940}
2941
4befb867 2942static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
eb492e01 2943{
5d88cc73 2944 struct l2cap_conn *conn = chan->conn;
7b9899db 2945 struct hci_conn *hcon = conn->hcon;
b28b4943 2946 struct smp_chan *smp;
92381f5c 2947 __u8 code, reason;
eb492e01
AB		 2948 int err = 0;
2949
8ae9b984 2950 if (skb->len < 1)
92381f5c 2951 return -EILSEQ;
92381f5c 2952
d7a5a11d 2953 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) {
2e65c9d2
AG		 2954 reason = SMP_PAIRING_NOTSUPP;
2955 goto done;
2956 }
2957
92381f5c 2958 code = skb->data[0];
eb492e01
AB		 2959 skb_pull(skb, sizeof(code));
2960
b28b4943
JH		 2961 smp = chan->data;
2962
2963 if (code > SMP_CMD_MAX)
2964 goto drop;
2965
24bd0bd9 2966 if (smp && !test_and_clear_bit(code, &smp->allow_cmd))
b28b4943
JH		 2967 goto drop;
2968
2969 /* If we don't have a context the only allowed commands are
2970 * pairing request and security request.
8cf9fa12 2971 */
b28b4943
JH		 2972 if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ)
2973 goto drop;
8cf9fa12 2974
eb492e01
AB		 2975 switch (code) {
2976 case SMP_CMD_PAIRING_REQ:
da85e5e5 2977 reason = smp_cmd_pairing_req(conn, skb);
eb492e01
AB		 2978 break;
2979
2980 case SMP_CMD_PAIRING_FAIL:
84794e11 2981 smp_failure(conn, 0);
da85e5e5 2982 err = -EPERM;
eb492e01
AB		 2983 break;
2984
2985 case SMP_CMD_PAIRING_RSP:
da85e5e5 2986 reason = smp_cmd_pairing_rsp(conn, skb);
88ba43b6
AB		 2987 break;
2988
2989 case SMP_CMD_SECURITY_REQ:
da85e5e5 2990 reason = smp_cmd_security_req(conn, skb);
88ba43b6
AB		 2991 break;
2992
eb492e01 2993 case SMP_CMD_PAIRING_CONFIRM:
da85e5e5 2994 reason = smp_cmd_pairing_confirm(conn, skb);
88ba43b6
AB		 2995 break;
2996
eb492e01 2997 case SMP_CMD_PAIRING_RANDOM:
da85e5e5 2998 reason = smp_cmd_pairing_random(conn, skb);
88ba43b6
AB		 2999 break;
3000
eb492e01 3001 case SMP_CMD_ENCRYPT_INFO:
7034b911
VCG		 3002 reason = smp_cmd_encrypt_info(conn, skb);
3003 break;
3004
fad646e1
AP		 3005 case SMP_CMD_INITIATOR_IDENT:
3006 reason = smp_cmd_initiator_ident(conn, skb);
7034b911
VCG		 3007 break;
3008
eb492e01 3009 case SMP_CMD_IDENT_INFO:
fd349c02
JH		 3010 reason = smp_cmd_ident_info(conn, skb);
3011 break;
3012
eb492e01 3013 case SMP_CMD_IDENT_ADDR_INFO:
fd349c02
JH		 3014 reason = smp_cmd_ident_addr_info(conn, skb);
3015 break;
3016
eb492e01 3017 case SMP_CMD_SIGN_INFO:
7ee4ea36 3018 reason = smp_cmd_sign_info(conn, skb);
7034b911
VCG		 3019 break;
3020
d8f8edbe
JH		 3021 case SMP_CMD_PUBLIC_KEY:
3022 reason = smp_cmd_public_key(conn, skb);
3023 break;
3024
6433a9a2
JH		 3025 case SMP_CMD_DHKEY_CHECK:
3026 reason = smp_cmd_dhkey_check(conn, skb);
3027 break;
3028
1408bb6e
JH		 3029 case SMP_CMD_KEYPRESS_NOTIFY:
3030 reason = smp_cmd_keypress_notify(conn, skb);
3031 break;
3032
eb492e01 3033 default:
2e1614f7 3034 bt_dev_dbg(hcon->hdev, "Unknown command code 0x%2.2x", code);
eb492e01 3035 reason = SMP_CMD_NOTSUPP;
3a0259bb 3036 goto done;
eb492e01
AB		 3037 }
3038
3a0259bb 3039done:
9b7b18ef
JH		 3040 if (!err) {
3041 if (reason)
3042 smp_failure(conn, reason);
8ae9b984 3043 kfree_skb(skb);
9b7b18ef
JH		 3044 }
3045
eb492e01 3046 return err;
b28b4943
JH		 3047
3048drop:
2064ee33
MH		 3049 bt_dev_err(hcon->hdev, "unexpected SMP command 0x%02x from %pMR",
3050 code, &hcon->dst);
b28b4943
JH		 3051 kfree_skb(skb);
3052 return 0;
eb492e01 3053}
7034b911 3054
70db83c4
JH		 3055static void smp_teardown_cb(struct l2cap_chan *chan, int err)
3056{
3057 struct l2cap_conn *conn = chan->conn;
3058
2e1614f7 3059 bt_dev_dbg(conn->hcon->hdev, "chan %p", chan);
70db83c4 3060
fc75cc86 3061 if (chan->data)
5d88cc73 3062 smp_chan_destroy(conn);
5d88cc73 3063
70db83c4
JH		 3064 conn->smp = NULL;
3065 l2cap_chan_put(chan);
3066}
3067
b5ae344d
JH		 3068static void bredr_pairing(struct l2cap_chan *chan)
3069{
3070 struct l2cap_conn *conn = chan->conn;
3071 struct hci_conn *hcon = conn->hcon;
3072 struct hci_dev *hdev = hcon->hdev;
3073 struct smp_cmd_pairing req;
3074 struct smp_chan *smp;
3075
2e1614f7 3076 bt_dev_dbg(hdev, "chan %p", chan);
b5ae344d
JH		 3077
3078 /* Only new pairings are interesting */
3079 if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags))
3080 return;
3081
3082 /* Don't bother if we're not encrypted */
3083 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3084 return;
3085
74be523c 3086 /* Only initiator may initiate SMP over BR/EDR */
b5ae344d
JH		 3087 if (hcon->role != HCI_ROLE_MASTER)
3088 return;
3089
3090 /* Secure Connections support must be enabled */
d7a5a11d 3091 if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED))
b5ae344d
JH		 3092 return;
3093
3094 /* BR/EDR must use Secure Connections for SMP */
3095 if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) &&
b7cb93e5 3096 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 3097 return;
3098
3099 /* If our LE support is not enabled don't do anything */
d7a5a11d 3100 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
b5ae344d
JH		 3101 return;
3102
3103 /* Don't bother if remote LE support is not enabled */
3104 if (!lmp_host_le_capable(hcon))
3105 return;
3106
3107 /* Remote must support SMP fixed chan for BR/EDR */
3108 if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR))
3109 return;
3110
3111 /* Don't bother if SMP is already ongoing */
3112 if (chan->data)
3113 return;
3114
3115 smp = smp_chan_create(conn);
3116 if (!smp) {
2064ee33 3117 bt_dev_err(hdev, "unable to create SMP context for BR/EDR");
b5ae344d
JH		 3118 return;
3119 }
3120
3121 set_bit(SMP_FLAG_SC, &smp->flags);
3122
2e1614f7 3123 bt_dev_dbg(hdev, "starting SMP over BR/EDR");
b5ae344d
JH		 3124
3125 /* Prepare and send the BR/EDR SMP Pairing Request */
3126 build_bredr_pairing_cmd(smp, &req, NULL);
3127
3128 smp->preq[0] = SMP_CMD_PAIRING_REQ;
3129 memcpy(&smp->preq[1], &req, sizeof(req));
3130
3131 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req);
3132 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
3133}
3134
44f1a7ab
JH		 3135static void smp_resume_cb(struct l2cap_chan *chan)
3136{
b68fda68 3137 struct smp_chan *smp = chan->data;
44f1a7ab
JH		 3138 struct l2cap_conn *conn = chan->conn;
3139 struct hci_conn *hcon = conn->hcon;
3140
2e1614f7 3141 bt_dev_dbg(hcon->hdev, "chan %p", chan);
44f1a7ab 3142
b5ae344d
JH		 3143 if (hcon->type == ACL_LINK) {
3144 bredr_pairing(chan);
ef8efe4b 3145 return;
b5ae344d 3146 }
ef8efe4b 3147
86d1407c
JH		 3148 if (!smp)
3149 return;
b68fda68 3150
84bc0db5
JH		 3151 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3152 return;
3153
86d1407c
JH		 3154 cancel_delayed_work(&smp->security_timer);
3155
d6268e86 3156 smp_distribute_keys(smp);
44f1a7ab
JH		 3157}
3158
70db83c4
JH		 3159static void smp_ready_cb(struct l2cap_chan *chan)
3160{
3161 struct l2cap_conn *conn = chan->conn;
b5ae344d 3162 struct hci_conn *hcon = conn->hcon;
70db83c4 3163
2e1614f7 3164 bt_dev_dbg(hcon->hdev, "chan %p", chan);
70db83c4 3165
7883746b
JH		 3166 /* No need to call l2cap_chan_hold() here since we already own
3167 * the reference taken in smp_new_conn_cb(). This is just the
3168 * first time that we tie it to a specific pointer. The code in
3169 * l2cap_core.c ensures that there's no risk this function wont
3170 * get called if smp_new_conn_cb was previously called.
3171 */
70db83c4 3172 conn->smp = chan;
b5ae344d
JH		 3173
3174 if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3175 bredr_pairing(chan);
70db83c4
JH		 3176}
3177
4befb867
JH		 3178static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
3179{
3180 int err;
3181
2e1614f7 3182 bt_dev_dbg(chan->conn->hcon->hdev, "chan %p", chan);
4befb867
JH		 3183
3184 err = smp_sig_channel(chan, skb);
3185 if (err) {
b68fda68 3186 struct smp_chan *smp = chan->data;
4befb867 3187
b68fda68
JH		 3188 if (smp)
3189 cancel_delayed_work_sync(&smp->security_timer);
4befb867 3190
1e91c29e 3191 hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);
4befb867
JH		 3192 }
3193
3194 return err;
3195}
3196
70db83c4
JH		 3197static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan,
3198 unsigned long hdr_len,
3199 unsigned long len, int nb)
3200{
3201 struct sk_buff *skb;
3202
3203 skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
3204 if (!skb)
3205 return ERR_PTR(-ENOMEM);
3206
3207 skb->priority = HCI_PRIO_MAX;
a4368ff3 3208 bt_cb(skb)->l2cap.chan = chan;
70db83c4
JH		 3209
3210 return skb;
3211}
3212
3213static const struct l2cap_ops smp_chan_ops = {
3214 .name = "Security Manager",
3215 .ready = smp_ready_cb,
5d88cc73 3216 .recv = smp_recv_cb,
70db83c4
JH		 3217 .alloc_skb = smp_alloc_skb_cb,
3218 .teardown = smp_teardown_cb,
44f1a7ab 3219 .resume = smp_resume_cb,
70db83c4
JH		 3220
3221 .new_connection = l2cap_chan_no_new_connection,
70db83c4
JH		 3222 .state_change = l2cap_chan_no_state_change,
3223 .close = l2cap_chan_no_close,
3224 .defer = l2cap_chan_no_defer,
3225 .suspend = l2cap_chan_no_suspend,
70db83c4
JH		 3226 .set_shutdown = l2cap_chan_no_set_shutdown,
3227 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3228};
3229
3230static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan)
3231{
3232 struct l2cap_chan *chan;
3233
995fca15 3234 BT_DBG("pchan %p", pchan);
70db83c4
JH		 3235
3236 chan = l2cap_chan_create();
3237 if (!chan)
3238 return NULL;
3239
3240 chan->chan_type = pchan->chan_type;
3241 chan->ops = &smp_chan_ops;
3242 chan->scid = pchan->scid;
3243 chan->dcid = chan->scid;
3244 chan->imtu = pchan->imtu;
3245 chan->omtu = pchan->omtu;
3246 chan->mode = pchan->mode;
3247
abe84903
JH		 3248 /* Other L2CAP channels may request SMP routines in order to
3249 * change the security level. This means that the SMP channel
3250 * lock must be considered in its own category to avoid lockdep
3251 * warnings.
3252 */
3253 atomic_set(&chan->nesting, L2CAP_NESTING_SMP);
3254
995fca15 3255 BT_DBG("created chan %p", chan);
70db83c4
JH		 3256
3257 return chan;
3258}
3259
3260static const struct l2cap_ops smp_root_chan_ops = {
3261 .name = "Security Manager Root",
3262 .new_connection = smp_new_conn_cb,
3263
3264 /* None of these are implemented for the root channel */
3265 .close = l2cap_chan_no_close,
3266 .alloc_skb = l2cap_chan_no_alloc_skb,
3267 .recv = l2cap_chan_no_recv,
3268 .state_change = l2cap_chan_no_state_change,
3269 .teardown = l2cap_chan_no_teardown,
3270 .ready = l2cap_chan_no_ready,
3271 .defer = l2cap_chan_no_defer,
3272 .suspend = l2cap_chan_no_suspend,
3273 .resume = l2cap_chan_no_resume,
3274 .set_shutdown = l2cap_chan_no_set_shutdown,
3275 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3276};
3277
ef8efe4b 3278static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
711eafe3 3279{
70db83c4 3280 struct l2cap_chan *chan;
88a479d9 3281 struct smp_dev *smp;
71af2f6b 3282 struct crypto_shash *tfm_cmac;
47eb2ac8 3283 struct crypto_kpp *tfm_ecdh;
70db83c4 3284
ef8efe4b 3285 if (cid == L2CAP_CID_SMP_BREDR) {
88a479d9 3286 smp = NULL;
ef8efe4b
JH		 3287 goto create_chan;
3288 }
711eafe3 3289
88a479d9
MH		 3290 smp = kzalloc(sizeof(*smp), GFP_KERNEL);
3291 if (!smp)
3292 return ERR_PTR(-ENOMEM);
3293
71af2f6b 3294 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
6e2dc6d1 3295 if (IS_ERR(tfm_cmac)) {
2e1614f7 3296 bt_dev_err(hdev, "Unable to create CMAC crypto context");
453431a5 3297 kfree_sensitive(smp);
6e2dc6d1
MH		 3298 return ERR_CAST(tfm_cmac);
3299 }
3300
6763f5ea 3301 tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0);
47eb2ac8 3302 if (IS_ERR(tfm_ecdh)) {
2e1614f7 3303 bt_dev_err(hdev, "Unable to create ECDH crypto context");
47eb2ac8 3304 crypto_free_shash(tfm_cmac);
453431a5 3305 kfree_sensitive(smp);
47eb2ac8
TA		 3306 return ERR_CAST(tfm_ecdh);
3307 }
3308
94f14e47 3309 smp->local_oob = false;
6e2dc6d1 3310 smp->tfm_cmac = tfm_cmac;
47eb2ac8 3311 smp->tfm_ecdh = tfm_ecdh;
88a479d9 3312
ef8efe4b 3313create_chan:
70db83c4
JH		 3314 chan = l2cap_chan_create();
3315 if (!chan) {
63511f6d 3316 if (smp) {
71af2f6b 3317 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 3318 crypto_free_kpp(smp->tfm_ecdh);
453431a5 3319 kfree_sensitive(smp);
63511f6d 3320 }
ef8efe4b 3321 return ERR_PTR(-ENOMEM);
70db83c4
JH		 3322 }
3323
88a479d9 3324 chan->data = smp;
defce9e8 3325
ef8efe4b 3326 l2cap_add_scid(chan, cid);
70db83c4
JH		 3327
3328 l2cap_chan_set_defaults(chan);
3329
157029ba 3330 if (cid == L2CAP_CID_SMP) {
39e3e744
JH		 3331 u8 bdaddr_type;
3332
3333 hci_copy_identity_address(hdev, &chan->src, &bdaddr_type);
3334
3335 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
157029ba 3336 chan->src_type = BDADDR_LE_PUBLIC;
39e3e744
JH		 3337 else
3338 chan->src_type = BDADDR_LE_RANDOM;
157029ba
MH		 3339 } else {
3340 bacpy(&chan->src, &hdev->bdaddr);
ef8efe4b 3341 chan->src_type = BDADDR_BREDR;
157029ba
MH		 3342 }
3343
70db83c4
JH		 3344 chan->state = BT_LISTEN;
3345 chan->mode = L2CAP_MODE_BASIC;
3346 chan->imtu = L2CAP_DEFAULT_MTU;
3347 chan->ops = &smp_root_chan_ops;
3348
abe84903
JH		 3349 /* Set correct nesting level for a parent/listening channel */
3350 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
3351
ef8efe4b 3352 return chan;
711eafe3
JH		 3353}
3354
ef8efe4b 3355static void smp_del_chan(struct l2cap_chan *chan)
711eafe3 3356{
88a479d9 3357 struct smp_dev *smp;
70db83c4 3358
995fca15 3359 BT_DBG("chan %p", chan);
711eafe3 3360
88a479d9
MH		 3361 smp = chan->data;
3362 if (smp) {
defce9e8 3363 chan->data = NULL;
71af2f6b 3364 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 3365 crypto_free_kpp(smp->tfm_ecdh);
453431a5 3366 kfree_sensitive(smp);
711eafe3 3367 }
70db83c4 3368
70db83c4 3369 l2cap_chan_put(chan);
711eafe3 3370}
ef8efe4b 3371
82493316 3372int smp_force_bredr(struct hci_dev *hdev, bool enable)
300acfde 3373{
b7cb93e5 3374 if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
300acfde
MH		 3375 return -EALREADY;
3376
3377 if (enable) {
3378 struct l2cap_chan *chan;
3379
3380 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3381 if (IS_ERR(chan))
3382 return PTR_ERR(chan);
3383
3384 hdev->smp_bredr_data = chan;
3385 } else {
3386 struct l2cap_chan *chan;
3387
3388 chan = hdev->smp_bredr_data;
3389 hdev->smp_bredr_data = NULL;
3390 smp_del_chan(chan);
3391 }
3392
b7cb93e5 3393 hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
300acfde 3394
82493316 3395 return 0;
300acfde
MH		 3396}
3397
ef8efe4b
JH		 3398int smp_register(struct hci_dev *hdev)
3399{
3400 struct l2cap_chan *chan;
3401
2e1614f7 3402 bt_dev_dbg(hdev, "");
ef8efe4b 3403
7e7ec445
MH		 3404 /* If the controller does not support Low Energy operation, then
3405 * there is also no need to register any SMP channel.
3406 */
3407 if (!lmp_le_capable(hdev))
3408 return 0;
3409
2b8df323
MH		 3410 if (WARN_ON(hdev->smp_data)) {
3411 chan = hdev->smp_data;
3412 hdev->smp_data = NULL;
3413 smp_del_chan(chan);
3414 }
3415
ef8efe4b
JH		 3416 chan = smp_add_cid(hdev, L2CAP_CID_SMP);
3417 if (IS_ERR(chan))
3418 return PTR_ERR(chan);
3419
3420 hdev->smp_data = chan;
3421
300acfde 3422 if (!lmp_sc_capable(hdev)) {
83ebb9ec
SJ		 3423 /* Flag can be already set here (due to power toggle) */
3424 if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
3425 return 0;
300acfde 3426 }
ef8efe4b 3427
2b8df323
MH		 3428 if (WARN_ON(hdev->smp_bredr_data)) {
3429 chan = hdev->smp_bredr_data;
3430 hdev->smp_bredr_data = NULL;
3431 smp_del_chan(chan);
3432 }
3433
ef8efe4b
JH		 3434 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3435 if (IS_ERR(chan)) {
3436 int err = PTR_ERR(chan);
3437 chan = hdev->smp_data;
3438 hdev->smp_data = NULL;
3439 smp_del_chan(chan);
3440 return err;
3441 }
3442
3443 hdev->smp_bredr_data = chan;
3444
3445 return 0;
3446}
3447
3448void smp_unregister(struct hci_dev *hdev)
3449{
3450 struct l2cap_chan *chan;
3451
3452 if (hdev->smp_bredr_data) {
3453 chan = hdev->smp_bredr_data;
3454 hdev->smp_bredr_data = NULL;
3455 smp_del_chan(chan);
3456 }
3457
3458 if (hdev->smp_data) {
3459 chan = hdev->smp_data;
3460 hdev->smp_data = NULL;
3461 smp_del_chan(chan);
3462 }
3463}
0a2b0f04
JH		 3464
3465#if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
3466
47eb2ac8 3467static int __init test_debug_key(struct crypto_kpp *tfm_ecdh)
71653eb6 3468{
c0153b0b 3469 u8 pk[64];
a2976416 3470 int err;
71653eb6 3471
c0153b0b 3472 err = set_ecdh_privkey(tfm_ecdh, debug_sk);
a2976416
TA		 3473 if (err)
3474 return err;
71653eb6 3475
c0153b0b
TA		 3476 err = generate_ecdh_public_key(tfm_ecdh, pk);
3477 if (err)
3478 return err;
71653eb6 3479
329d8230 3480 if (crypto_memneq(pk, debug_pk, 64))
71653eb6
MH		 3481 return -EINVAL;
3482
3483 return 0;
3484}
3485
28a220aa 3486static int __init test_ah(void)
cfc4198e
JH		 3487{
3488 const u8 irk[16] = {
3489 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3490 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3491 const u8 r[3] = { 0x94, 0x81, 0x70 };
3492 const u8 exp[3] = { 0xaa, 0xfb, 0x0d };
3493 u8 res[3];
3494 int err;
3495
28a220aa 3496 err = smp_ah(irk, r, res);
cfc4198e
JH		 3497 if (err)
3498 return err;
3499
329d8230 3500 if (crypto_memneq(res, exp, 3))
cfc4198e
JH		 3501 return -EINVAL;
3502
3503 return 0;
3504}
3505
28a220aa 3506static int __init test_c1(void)
cfc4198e
JH		 3507{
3508 const u8 k[16] = {
3509 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3510 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3511 const u8 r[16] = {
3512 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63,
3513 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 };
3514 const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 };
3515 const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 };
3516 const u8 _iat = 0x01;
3517 const u8 _rat = 0x00;
3518 const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } };
3519 const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } };
3520 const u8 exp[16] = {
3521 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2,
3522 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e };
3523 u8 res[16];
3524 int err;
3525
28a220aa 3526 err = smp_c1(k, r, preq, pres, _iat, &ia, _rat, &ra, res);
cfc4198e
JH		 3527 if (err)
3528 return err;
3529
329d8230 3530 if (crypto_memneq(res, exp, 16))
cfc4198e
JH		 3531 return -EINVAL;
3532
3533 return 0;
3534}
3535
28a220aa 3536static int __init test_s1(void)
cfc4198e
JH		 3537{
3538 const u8 k[16] = {
3539 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3540 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3541 const u8 r1[16] = {
3542 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 };
3543 const u8 r2[16] = {
3544 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 };
3545 const u8 exp[16] = {
3546 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b,
3547 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a };
3548 u8 res[16];
3549 int err;
3550
28a220aa 3551 err = smp_s1(k, r1, r2, res);
cfc4198e
JH		 3552 if (err)
3553 return err;
3554
329d8230 3555 if (crypto_memneq(res, exp, 16))
cfc4198e
JH		 3556 return -EINVAL;
3557
3558 return 0;
3559}
3560
71af2f6b 3561static int __init test_f4(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3562{
3563 const u8 u[32] = {
3564 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3565 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3566 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3567 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3568 const u8 v[32] = {
3569 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3570 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3571 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3572 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3573 const u8 x[16] = {
3574 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3575 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3576 const u8 z = 0x00;
3577 const u8 exp[16] = {
3578 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1,
3579 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 };
3580 u8 res[16];
3581 int err;
3582
3583 err = smp_f4(tfm_cmac, u, v, x, z, res);
3584 if (err)
3585 return err;
3586
329d8230 3587 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3588 return -EINVAL;
3589
3590 return 0;
3591}
3592
71af2f6b 3593static int __init test_f5(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3594{
3595 const u8 w[32] = {
3596 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86,
3597 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99,
3598 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3599 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3600 const u8 n1[16] = {
3601 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3602 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3603 const u8 n2[16] = {
3604 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3605 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3606 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3607 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3608 const u8 exp_ltk[16] = {
3609 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98,
3610 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 };
3611 const u8 exp_mackey[16] = {
3612 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3613 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3614 u8 mackey[16], ltk[16];
3615 int err;
3616
3617 err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk);
3618 if (err)
3619 return err;
3620
329d8230 3621 if (crypto_memneq(mackey, exp_mackey, 16))
fb2969a3
JH		 3622 return -EINVAL;
3623
329d8230 3624 if (crypto_memneq(ltk, exp_ltk, 16))
fb2969a3
JH		 3625 return -EINVAL;
3626
3627 return 0;
3628}
3629
71af2f6b 3630static int __init test_f6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3631{
3632 const u8 w[16] = {
3633 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3634 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3635 const u8 n1[16] = {
3636 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3637 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3638 const u8 n2[16] = {
3639 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3640 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3641 const u8 r[16] = {
3642 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08,
3643 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 };
3644 const u8 io_cap[3] = { 0x02, 0x01, 0x01 };
3645 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3646 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3647 const u8 exp[16] = {
3648 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2,
3649 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 };
3650 u8 res[16];
3651 int err;
3652
3653 err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res);
3654 if (err)
3655 return err;
3656
329d8230 3657 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3658 return -EINVAL;
3659
3660 return 0;
3661}
3662
71af2f6b 3663static int __init test_g2(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3664{
3665 const u8 u[32] = {
3666 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3667 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3668 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3669 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3670 const u8 v[32] = {
3671 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3672 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3673 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3674 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3675 const u8 x[16] = {
3676 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3677 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3678 const u8 y[16] = {
3679 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3680 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3681 const u32 exp_val = 0x2f9ed5ba % 1000000;
3682 u32 val;
3683 int err;
3684
3685 err = smp_g2(tfm_cmac, u, v, x, y, &val);
3686 if (err)
3687 return err;
3688
3689 if (val != exp_val)
3690 return -EINVAL;
3691
3692 return 0;
3693}
3694
71af2f6b 3695static int __init test_h6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3696{
3697 const u8 w[16] = {
3698 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3699 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3700 const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c };
3701 const u8 exp[16] = {
3702 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8,
3703 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d };
3704 u8 res[16];
3705 int err;
3706
3707 err = smp_h6(tfm_cmac, w, key_id, res);
3708 if (err)
3709 return err;
3710
329d8230 3711 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3712 return -EINVAL;
3713
3714 return 0;
3715}
3716
64dd374e
MH		 3717static char test_smp_buffer[32];
3718
3719static ssize_t test_smp_read(struct file *file, char __user *user_buf,
3720 size_t count, loff_t *ppos)
3721{
3722 return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer,
3723 strlen(test_smp_buffer));
3724}
3725
3726static const struct file_operations test_smp_fops = {
3727 .open = simple_open,
3728 .read = test_smp_read,
3729 .llseek = default_llseek,
3730};
3731
28a220aa 3732static int __init run_selftests(struct crypto_shash *tfm_cmac,
47eb2ac8 3733 struct crypto_kpp *tfm_ecdh)
0a2b0f04 3734{
255047b0
MH		 3735 ktime_t calltime, delta, rettime;
3736 unsigned long long duration;
cfc4198e
JH		 3737 int err;
3738
255047b0
MH		 3739 calltime = ktime_get();
3740
47eb2ac8 3741 err = test_debug_key(tfm_ecdh);
71653eb6
MH		 3742 if (err) {
3743 BT_ERR("debug_key test failed");
3744 goto done;
3745 }
3746
28a220aa 3747 err = test_ah();
cfc4198e
JH		 3748 if (err) {
3749 BT_ERR("smp_ah test failed");
64dd374e 3750 goto done;
cfc4198e
JH		 3751 }
3752
28a220aa 3753 err = test_c1();
cfc4198e
JH		 3754 if (err) {
3755 BT_ERR("smp_c1 test failed");
64dd374e 3756 goto done;
cfc4198e
JH		 3757 }
3758
28a220aa 3759 err = test_s1();
cfc4198e
JH		 3760 if (err) {
3761 BT_ERR("smp_s1 test failed");
64dd374e 3762 goto done;
cfc4198e
JH		 3763 }
3764
fb2969a3
JH		 3765 err = test_f4(tfm_cmac);
3766 if (err) {
3767 BT_ERR("smp_f4 test failed");
64dd374e 3768 goto done;
fb2969a3
JH		 3769 }
3770
3771 err = test_f5(tfm_cmac);
3772 if (err) {
3773 BT_ERR("smp_f5 test failed");
64dd374e 3774 goto done;
fb2969a3
JH		 3775 }
3776
3777 err = test_f6(tfm_cmac);
3778 if (err) {
3779 BT_ERR("smp_f6 test failed");
64dd374e 3780 goto done;
fb2969a3
JH		 3781 }
3782
3783 err = test_g2(tfm_cmac);
3784 if (err) {
3785 BT_ERR("smp_g2 test failed");
64dd374e 3786 goto done;
fb2969a3
JH		 3787 }
3788
3789 err = test_h6(tfm_cmac);
3790 if (err) {
3791 BT_ERR("smp_h6 test failed");
64dd374e 3792 goto done;
fb2969a3
JH		 3793 }
3794
255047b0
MH		 3795 rettime = ktime_get();
3796 delta = ktime_sub(rettime, calltime);
3797 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
3798
5ced2464 3799 BT_INFO("SMP test passed in %llu usecs", duration);
0a2b0f04 3800
64dd374e
MH		 3801done:
3802 if (!err)
3803 snprintf(test_smp_buffer, sizeof(test_smp_buffer),
3804 "PASS (%llu usecs)\n", duration);
3805 else
3806 snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n");
3807
3808 debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL,
3809 &test_smp_fops);
3810
3811 return err;
0a2b0f04
JH		 3812}
3813
3814int __init bt_selftest_smp(void)
3815{
71af2f6b 3816 struct crypto_shash *tfm_cmac;
47eb2ac8 3817 struct crypto_kpp *tfm_ecdh;
0a2b0f04
JH		 3818 int err;
3819
3d234b33 3820 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
0a2b0f04
JH		 3821 if (IS_ERR(tfm_cmac)) {
3822 BT_ERR("Unable to create CMAC crypto context");
0a2b0f04
JH		 3823 return PTR_ERR(tfm_cmac);
3824 }
3825
6763f5ea 3826 tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0);
47eb2ac8
TA		 3827 if (IS_ERR(tfm_ecdh)) {
3828 BT_ERR("Unable to create ECDH crypto context");
3829 crypto_free_shash(tfm_cmac);
47eb2ac8
TA		 3830 return PTR_ERR(tfm_ecdh);
3831 }
3832
28a220aa 3833 err = run_selftests(tfm_cmac, tfm_ecdh);
0a2b0f04 3834
71af2f6b 3835 crypto_free_shash(tfm_cmac);
47eb2ac8 3836 crypto_free_kpp(tfm_ecdh);
0a2b0f04
JH		 3837
3838 return err;
3839}
3840
3841#endif
Linux 6.x block layer and io_uring tree(s)