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Merge tag 'v6.6-p5' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[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
b8b23001
LAD		 61#define ID_ADDR_TIMEOUT msecs_to_jiffies(200)
62
d7a5a11d 63#define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \
a62da6f1 64 0x3f : 0x07)
0edb14de 65#define KEY_DIST_MASK 0x07
065a13e2 66
cbbbe3e2
JH		 67/* Maximum message length that can be passed to aes_cmac */
68#define CMAC_MSG_MAX 80
69
533e35d4
JH		 70enum {
71 SMP_FLAG_TK_VALID,
72 SMP_FLAG_CFM_PENDING,
73 SMP_FLAG_MITM_AUTH,
74 SMP_FLAG_COMPLETE,
75 SMP_FLAG_INITIATOR,
65668776 76 SMP_FLAG_SC,
d8f8edbe 77 SMP_FLAG_REMOTE_PK,
aeb7d461 78 SMP_FLAG_DEBUG_KEY,
38606f14 79 SMP_FLAG_WAIT_USER,
d3e54a87 80 SMP_FLAG_DHKEY_PENDING,
1a8bab4f
JH		 81 SMP_FLAG_REMOTE_OOB,
82 SMP_FLAG_LOCAL_OOB,
a62da6f1 83 SMP_FLAG_CT2,
533e35d4 84};
4bc58f51 85
88a479d9 86struct smp_dev {
60a27d65 87 /* Secure Connections OOB data */
94f14e47 88 bool local_oob;
60a27d65 89 u8 local_pk[64];
fb334fee 90 u8 local_rand[16];
60a27d65
MH		 91 bool debug_key;
92
71af2f6b 93 struct crypto_shash *tfm_cmac;
47eb2ac8 94 struct crypto_kpp *tfm_ecdh;
88a479d9
MH		 95};
96
4bc58f51 97struct smp_chan {
b68fda68
JH		 98 struct l2cap_conn *conn;
99 struct delayed_work security_timer;
b28b4943 100 unsigned long allow_cmd; /* Bitmask of allowed commands */
b68fda68 101
4bc58f51
JH		 102 u8 preq[7]; /* SMP Pairing Request */
103 u8 prsp[7]; /* SMP Pairing Response */
104 u8 prnd[16]; /* SMP Pairing Random (local) */
105 u8 rrnd[16]; /* SMP Pairing Random (remote) */
106 u8 pcnf[16]; /* SMP Pairing Confirm */
107 u8 tk[16]; /* SMP Temporary Key */
882fafad
JH		 108 u8 rr[16]; /* Remote OOB ra/rb value */
109 u8 lr[16]; /* Local OOB ra/rb value */
4bc58f51
JH		 110 u8 enc_key_size;
111 u8 remote_key_dist;
112 bdaddr_t id_addr;
113 u8 id_addr_type;
114 u8 irk[16];
115 struct smp_csrk *csrk;
fad646e1 116 struct smp_csrk *responder_csrk;
4bc58f51 117 struct smp_ltk *ltk;
fad646e1 118 struct smp_ltk *responder_ltk;
4bc58f51 119 struct smp_irk *remote_irk;
6a77083a 120 u8 *link_key;
4a74d658 121 unsigned long flags;
783e0574 122 u8 method;
38606f14 123 u8 passkey_round;
6a7bd103 124
3b19146d
JH		 125 /* Secure Connections variables */
126 u8 local_pk[64];
d8f8edbe
JH		 127 u8 remote_pk[64];
128 u8 dhkey[32];
760b018b 129 u8 mackey[16];
3b19146d 130
71af2f6b 131 struct crypto_shash *tfm_cmac;
47eb2ac8 132 struct crypto_kpp *tfm_ecdh;
4bc58f51
JH		 133};
134
aeb7d461
JH		 135/* These debug key values are defined in the SMP section of the core
136 * specification. debug_pk is the public debug key and debug_sk the
137 * private debug key.
138 */
139static const u8 debug_pk[64] = {
140 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
141 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
142 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
143 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20,
144
145 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74,
146 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76,
147 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63,
148 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc,
149};
150
151static const u8 debug_sk[32] = {
152 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58,
153 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a,
154 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74,
155 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f,
156};
157
8a2936f4 158static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
d22ef0bc 159{
8a2936f4 160 size_t i;
d22ef0bc 161
8a2936f4
JH		 162 for (i = 0; i < len; i++)
163 dst[len - 1 - i] = src[i];
d22ef0bc
AB		 164}
165
06edf8de
JH		 166/* The following functions map to the LE SC SMP crypto functions
167 * AES-CMAC, f4, f5, f6, g2 and h6.
168 */
169
71af2f6b 170static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m,
cbbbe3e2
JH		 171 size_t len, u8 mac[16])
172{
173 uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
cbbbe3e2
JH		 174 int err;
175
176 if (len > CMAC_MSG_MAX)
177 return -EFBIG;
178
179 if (!tfm) {
180 BT_ERR("tfm %p", tfm);
181 return -EINVAL;
182 }
183
cbbbe3e2
JH		 184 /* Swap key and message from LSB to MSB */
185 swap_buf(k, tmp, 16);
186 swap_buf(m, msg_msb, len);
187
c7a3d57d
JH		 188 SMP_DBG("msg (len %zu) %*phN", len, (int) len, m);
189 SMP_DBG("key %16phN", k);
cbbbe3e2 190
71af2f6b 191 err = crypto_shash_setkey(tfm, tmp, 16);
cbbbe3e2
JH		 192 if (err) {
193 BT_ERR("cipher setkey failed: %d", err);
194 return err;
195 }
196
ec0bf6ed 197 err = crypto_shash_tfm_digest(tfm, msg_msb, len, mac_msb);
cbbbe3e2 198 if (err) {
71af2f6b 199 BT_ERR("Hash computation error %d", err);
cbbbe3e2
JH		 200 return err;
201 }
202
203 swap_buf(mac_msb, mac, 16);
204
c7a3d57d 205 SMP_DBG("mac %16phN", mac);
cbbbe3e2
JH		 206
207 return 0;
208}
209
71af2f6b
HX		 210static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32],
211 const u8 v[32], const u8 x[16], u8 z, u8 res[16])
cbbbe3e2
JH		 212{
213 u8 m[65];
214 int err;
215
c7a3d57d
JH		 216 SMP_DBG("u %32phN", u);
217 SMP_DBG("v %32phN", v);
218 SMP_DBG("x %16phN z %02x", x, z);
cbbbe3e2
JH		 219
220 m[0] = z;
221 memcpy(m + 1, v, 32);
222 memcpy(m + 33, u, 32);
223
224 err = aes_cmac(tfm_cmac, x, m, sizeof(m), res);
225 if (err)
226 return err;
227
c7a3d57d 228 SMP_DBG("res %16phN", res);
cbbbe3e2
JH		 229
230 return err;
231}
232
71af2f6b 233static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32],
4da50de8
JH		 234 const u8 n1[16], const u8 n2[16], const u8 a1[7],
235 const u8 a2[7], u8 mackey[16], u8 ltk[16])
760b018b
JH		 236{
237 /* The btle, salt and length "magic" values are as defined in
238 * the SMP section of the Bluetooth core specification. In ASCII
239 * the btle value ends up being 'btle'. The salt is just a
240 * random number whereas length is the value 256 in little
241 * endian format.
242 */
243 const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 };
244 const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60,
245 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c };
246 const u8 length[2] = { 0x00, 0x01 };
247 u8 m[53], t[16];
248 int err;
249
c7a3d57d
JH		 250 SMP_DBG("w %32phN", w);
251 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
252 SMP_DBG("a1 %7phN a2 %7phN", a1, a2);
760b018b
JH		 253
254 err = aes_cmac(tfm_cmac, salt, w, 32, t);
255 if (err)
256 return err;
257
c7a3d57d 258 SMP_DBG("t %16phN", t);
760b018b
JH		 259
260 memcpy(m, length, 2);
261 memcpy(m + 2, a2, 7);
262 memcpy(m + 9, a1, 7);
263 memcpy(m + 16, n2, 16);
264 memcpy(m + 32, n1, 16);
265 memcpy(m + 48, btle, 4);
266
267 m[52] = 0; /* Counter */
268
269 err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey);
270 if (err)
271 return err;
272
c7a3d57d 273 SMP_DBG("mackey %16phN", mackey);
760b018b
JH		 274
275 m[52] = 1; /* Counter */
276
277 err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk);
278 if (err)
279 return err;
280
c7a3d57d 281 SMP_DBG("ltk %16phN", ltk);
760b018b
JH		 282
283 return 0;
284}
285
71af2f6b 286static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16],
4da50de8 287 const u8 n1[16], const u8 n2[16], const u8 r[16],
760b018b
JH		 288 const u8 io_cap[3], const u8 a1[7], const u8 a2[7],
289 u8 res[16])
290{
291 u8 m[65];
292 int err;
293
c7a3d57d
JH		 294 SMP_DBG("w %16phN", w);
295 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
296 SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2);
760b018b
JH		 297
298 memcpy(m, a2, 7);
299 memcpy(m + 7, a1, 7);
300 memcpy(m + 14, io_cap, 3);
301 memcpy(m + 17, r, 16);
302 memcpy(m + 33, n2, 16);
303 memcpy(m + 49, n1, 16);
304
305 err = aes_cmac(tfm_cmac, w, m, sizeof(m), res);
306 if (err)
307 return err;
308
203de21b 309 SMP_DBG("res %16phN", res);
760b018b
JH		 310
311 return err;
312}
313
71af2f6b 314static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32],
191dc7fe
JH		 315 const u8 x[16], const u8 y[16], u32 *val)
316{
317 u8 m[80], tmp[16];
318 int err;
319
c7a3d57d
JH		 320 SMP_DBG("u %32phN", u);
321 SMP_DBG("v %32phN", v);
322 SMP_DBG("x %16phN y %16phN", x, y);
191dc7fe
JH		 323
324 memcpy(m, y, 16);
325 memcpy(m + 16, v, 32);
326 memcpy(m + 48, u, 32);
327
328 err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
329 if (err)
330 return err;
331
332 *val = get_unaligned_le32(tmp);
333 *val %= 1000000;
334
c7a3d57d 335 SMP_DBG("val %06u", *val);
191dc7fe
JH		 336
337 return 0;
338}
339
71af2f6b 340static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16],
06edf8de
JH		 341 const u8 key_id[4], u8 res[16])
342{
343 int err;
344
345 SMP_DBG("w %16phN key_id %4phN", w, key_id);
346
347 err = aes_cmac(tfm_cmac, w, key_id, 4, res);
348 if (err)
349 return err;
350
351 SMP_DBG("res %16phN", res);
352
353 return err;
354}
355
a62da6f1
JH		 356static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16],
357 const u8 salt[16], u8 res[16])
358{
359 int err;
360
361 SMP_DBG("w %16phN salt %16phN", w, salt);
362
363 err = aes_cmac(tfm_cmac, salt, w, 16, res);
364 if (err)
365 return err;
366
367 SMP_DBG("res %16phN", res);
368
369 return err;
370}
371
06edf8de
JH		 372/* The following functions map to the legacy SMP crypto functions e, c1,
373 * s1 and ah.
374 */
375
28a220aa 376static int smp_e(const u8 *k, u8 *r)
d22ef0bc 377{
28a220aa 378 struct crypto_aes_ctx ctx;
943a732a 379 uint8_t tmp[16], data[16];
201a5929 380 int err;
d22ef0bc 381
011c391a
JH		 382 SMP_DBG("k %16phN r %16phN", k, r);
383
943a732a 384 /* The most significant octet of key corresponds to k[0] */
8a2936f4 385 swap_buf(k, tmp, 16);
943a732a 386
28a220aa 387 err = aes_expandkey(&ctx, tmp, 16);
d22ef0bc
AB		 388 if (err) {
389 BT_ERR("cipher setkey failed: %d", err);
390 return err;
391 }
392
943a732a 393 /* Most significant octet of plaintextData corresponds to data[0] */
8a2936f4 394 swap_buf(r, data, 16);
943a732a 395
28a220aa 396 aes_encrypt(&ctx, data, data);
d22ef0bc 397
943a732a 398 /* Most significant octet of encryptedData corresponds to data[0] */
8a2936f4 399 swap_buf(data, r, 16);
943a732a 400
011c391a
JH		 401 SMP_DBG("r %16phN", r);
402
c29fb5f6 403 memzero_explicit(&ctx, sizeof(ctx));
d22ef0bc
AB		 404 return err;
405}
406
28a220aa 407static int smp_c1(const u8 k[16],
06edf8de
JH		 408 const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
409 const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
6a77083a 410{
06edf8de 411 u8 p1[16], p2[16];
6a77083a
JH		 412 int err;
413
011c391a
JH		 414 SMP_DBG("k %16phN r %16phN", k, r);
415 SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra);
416 SMP_DBG("preq %7phN pres %7phN", preq, pres);
417
06edf8de 418 memset(p1, 0, 16);
6a77083a 419
06edf8de
JH		 420 /* p1 = pres || preq || _rat || _iat */
421 p1[0] = _iat;
422 p1[1] = _rat;
423 memcpy(p1 + 2, preq, 7);
424 memcpy(p1 + 9, pres, 7);
425
011c391a 426 SMP_DBG("p1 %16phN", p1);
06edf8de
JH		 427
428 /* res = r XOR p1 */
ef0bb5ad 429 crypto_xor_cpy(res, r, p1, sizeof(p1));
06edf8de
JH		 430
431 /* res = e(k, res) */
28a220aa 432 err = smp_e(k, res);
06edf8de
JH		 433 if (err) {
434 BT_ERR("Encrypt data error");
6a77083a 435 return err;
06edf8de 436 }
6a77083a 437
011c391a
JH		 438 /* p2 = padding || ia || ra */
439 memcpy(p2, ra, 6);
440 memcpy(p2 + 6, ia, 6);
441 memset(p2 + 12, 0, 4);
442
443 SMP_DBG("p2 %16phN", p2);
444
06edf8de 445 /* res = res XOR p2 */
ef0bb5ad 446 crypto_xor(res, p2, sizeof(p2));
06edf8de
JH		 447
448 /* res = e(k, res) */
28a220aa 449 err = smp_e(k, res);
06edf8de
JH		 450 if (err)
451 BT_ERR("Encrypt data error");
452
453 return err;
454}
455
28a220aa 456static int smp_s1(const u8 k[16],
06edf8de
JH		 457 const u8 r1[16], const u8 r2[16], u8 _r[16])
458{
459 int err;
460
461 /* Just least significant octets from r1 and r2 are considered */
462 memcpy(_r, r2, 8);
463 memcpy(_r + 8, r1, 8);
464
28a220aa 465 err = smp_e(k, _r);
06edf8de
JH		 466 if (err)
467 BT_ERR("Encrypt data error");
6a77083a
JH		 468
469 return err;
470}
471
28a220aa 472static int smp_ah(const u8 irk[16], const u8 r[3], u8 res[3])
60478054 473{
943a732a 474 u8 _res[16];
60478054
JH		 475 int err;
476
477 /* r' = padding || r */
943a732a
JH		 478 memcpy(_res, r, 3);
479 memset(_res + 3, 0, 13);
60478054 480
28a220aa 481 err = smp_e(irk, _res);
60478054
JH		 482 if (err) {
483 BT_ERR("Encrypt error");
484 return err;
485 }
486
487 /* The output of the random address function ah is:
c5080d42 488 * ah(k, r) = e(k, r') mod 2^24
60478054
JH		 489 * The output of the security function e is then truncated to 24 bits
490 * by taking the least significant 24 bits of the output of e as the
491 * result of ah.
492 */
943a732a 493 memcpy(res, _res, 3);
60478054
JH		 494
495 return 0;
496}
497
cd082797
JH		 498bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
499 const bdaddr_t *bdaddr)
60478054 500{
defce9e8 501 struct l2cap_chan *chan = hdev->smp_data;
60478054
JH		 502 u8 hash[3];
503 int err;
504
defce9e8
JH		 505 if (!chan || !chan->data)
506 return false;
507
56860245 508 bt_dev_dbg(hdev, "RPA %pMR IRK %*phN", bdaddr, 16, irk);
60478054 509
28a220aa 510 err = smp_ah(irk, &bdaddr->b[3], hash);
60478054
JH		 511 if (err)
512 return false;
513
329d8230 514 return !crypto_memneq(bdaddr->b, hash, 3);
60478054
JH		 515}
516
cd082797 517int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
b1e2b3ae 518{
defce9e8 519 struct l2cap_chan *chan = hdev->smp_data;
b1e2b3ae
JH		 520 int err;
521
defce9e8
JH		 522 if (!chan || !chan->data)
523 return -EOPNOTSUPP;
524
b1e2b3ae
JH		 525 get_random_bytes(&rpa->b[3], 3);
526
527 rpa->b[5] &= 0x3f; /* Clear two most significant bits */
528 rpa->b[5] |= 0x40; /* Set second most significant bit */
529
28a220aa 530 err = smp_ah(irk, &rpa->b[3], rpa->b);
b1e2b3ae
JH		 531 if (err < 0)
532 return err;
533
56860245 534 bt_dev_dbg(hdev, "RPA %pMR", rpa);
b1e2b3ae
JH		 535
536 return 0;
537}
538
60a27d65
MH		 539int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
540{
541 struct l2cap_chan *chan = hdev->smp_data;
542 struct smp_dev *smp;
543 int err;
544
545 if (!chan || !chan->data)
546 return -EOPNOTSUPP;
547
548 smp = chan->data;
549
550 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
56860245 551 bt_dev_dbg(hdev, "Using debug keys");
c0153b0b
TA		 552 err = set_ecdh_privkey(smp->tfm_ecdh, debug_sk);
553 if (err)
554 return err;
60a27d65 555 memcpy(smp->local_pk, debug_pk, 64);
60a27d65
MH		 556 smp->debug_key = true;
557 } else {
558 while (true) {
c0153b0b
TA		 559 /* Generate key pair for Secure Connections */
560 err = generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk);
a2976416
TA		 561 if (err)
562 return err;
60a27d65
MH		 563
564 /* This is unlikely, but we need to check that
91641b79 565 * we didn't accidentally generate a debug key.
60a27d65 566 */
c0153b0b 567 if (crypto_memneq(smp->local_pk, debug_pk, 64))
60a27d65
MH		 568 break;
569 }
570 smp->debug_key = false;
571 }
572
573 SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
574 SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
60a27d65 575
fb334fee 576 get_random_bytes(smp->local_rand, 16);
60a27d65
MH		 577
578 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
fb334fee 579 smp->local_rand, 0, hash);
60a27d65
MH		 580 if (err < 0)
581 return err;
582
fb334fee 583 memcpy(rand, smp->local_rand, 16);
60a27d65 584
94f14e47
JH		 585 smp->local_oob = true;
586
60a27d65
MH		 587 return 0;
588}
589
5d88cc73 590static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
eb492e01 591{
5d88cc73 592 struct l2cap_chan *chan = conn->smp;
b68fda68 593 struct smp_chan *smp;
5d88cc73
JH		 594 struct kvec iv[2];
595 struct msghdr msg;
eb492e01 596
5d88cc73
JH		 597 if (!chan)
598 return;
eb492e01 599
2e1614f7 600 bt_dev_dbg(conn->hcon->hdev, "code 0x%2.2x", code);
eb492e01 601
5d88cc73
JH		 602 iv[0].iov_base = &code;
603 iv[0].iov_len = 1;
eb492e01 604
5d88cc73
JH		 605 iv[1].iov_base = data;
606 iv[1].iov_len = len;
eb492e01 607
5d88cc73 608 memset(&msg, 0, sizeof(msg));
eb492e01 609
de4eda9d 610 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iv, 2, 1 + len);
eb492e01 611
5d88cc73 612 l2cap_chan_send(chan, &msg, 1 + len);
e2dcd113 613
b68fda68
JH		 614 if (!chan->data)
615 return;
616
617 smp = chan->data;
618
619 cancel_delayed_work_sync(&smp->security_timer);
1b0921d6 620 schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
eb492e01
AB		 621}
622
d2eb9e10 623static u8 authreq_to_seclevel(u8 authreq)
2b64d153 624{
d2eb9e10
JH		 625 if (authreq & SMP_AUTH_MITM) {
626 if (authreq & SMP_AUTH_SC)
627 return BT_SECURITY_FIPS;
628 else
629 return BT_SECURITY_HIGH;
630 } else {
2b64d153 631 return BT_SECURITY_MEDIUM;
d2eb9e10 632 }
2b64d153
BG		 633}
634
635static __u8 seclevel_to_authreq(__u8 sec_level)
636{
637 switch (sec_level) {
d2eb9e10 638 case BT_SECURITY_FIPS:
2b64d153
BG		 639 case BT_SECURITY_HIGH:
640 return SMP_AUTH_MITM | SMP_AUTH_BONDING;
641 case BT_SECURITY_MEDIUM:
642 return SMP_AUTH_BONDING;
643 default:
644 return SMP_AUTH_NONE;
645 }
646}
647
b8e66eac 648static void build_pairing_cmd(struct l2cap_conn *conn,
f1560463
MH		 649 struct smp_cmd_pairing *req,
650 struct smp_cmd_pairing *rsp, __u8 authreq)
b8e66eac 651{
5d88cc73
JH		 652 struct l2cap_chan *chan = conn->smp;
653 struct smp_chan *smp = chan->data;
fd349c02
JH		 654 struct hci_conn *hcon = conn->hcon;
655 struct hci_dev *hdev = hcon->hdev;
02b05bd8 656 u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT;
54790f73 657
d7a5a11d 658 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
7ee4ea36
MH		 659 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
660 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
54790f73 661 authreq |= SMP_AUTH_BONDING;
2b64d153
BG		 662 } else {
663 authreq &= ~SMP_AUTH_BONDING;
54790f73
VCG		 664 }
665
d7a5a11d 666 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
fd349c02
JH		 667 remote_dist |= SMP_DIST_ID_KEY;
668
d7a5a11d 669 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
863efaf2
JH		 670 local_dist |= SMP_DIST_ID_KEY;
671
d7a5a11d 672 if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&
02b05bd8
JH		 673 (authreq & SMP_AUTH_SC)) {
674 struct oob_data *oob_data;
675 u8 bdaddr_type;
676
d7a5a11d 677 if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
df8e1a4c
JH		 678 local_dist |= SMP_DIST_LINK_KEY;
679 remote_dist |= SMP_DIST_LINK_KEY;
680 }
02b05bd8
JH		 681
682 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
683 bdaddr_type = BDADDR_LE_PUBLIC;
684 else
685 bdaddr_type = BDADDR_LE_RANDOM;
686
687 oob_data = hci_find_remote_oob_data(hdev, &hcon->dst,
688 bdaddr_type);
4775a4ea 689 if (oob_data && oob_data->present) {
1a8bab4f 690 set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags);
02b05bd8 691 oob_flag = SMP_OOB_PRESENT;
a29b0733 692 memcpy(smp->rr, oob_data->rand256, 16);
02b05bd8 693 memcpy(smp->pcnf, oob_data->hash256, 16);
bc07cd69
MH		 694 SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf);
695 SMP_DBG("OOB Remote Random: %16phN", smp->rr);
02b05bd8
JH		 696 }
697
df8e1a4c
JH		 698 } else {
699 authreq &= ~SMP_AUTH_SC;
700 }
701
54790f73
VCG		 702 if (rsp == NULL) {
703 req->io_capability = conn->hcon->io_capability;
02b05bd8 704 req->oob_flag = oob_flag;
30d65e08 705 req->max_key_size = hdev->le_max_key_size;
fd349c02
JH		 706 req->init_key_dist = local_dist;
707 req->resp_key_dist = remote_dist;
0edb14de 708 req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 709
710 smp->remote_key_dist = remote_dist;
54790f73
VCG		 711 return;
712 }
713
714 rsp->io_capability = conn->hcon->io_capability;
02b05bd8 715 rsp->oob_flag = oob_flag;
30d65e08 716 rsp->max_key_size = hdev->le_max_key_size;
fd349c02
JH		 717 rsp->init_key_dist = req->init_key_dist & remote_dist;
718 rsp->resp_key_dist = req->resp_key_dist & local_dist;
0edb14de 719 rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 720
721 smp->remote_key_dist = rsp->init_key_dist;
b8e66eac
VCG		 722}
723
3158c50c
VCG		 724static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
725{
5d88cc73 726 struct l2cap_chan *chan = conn->smp;
2fd36558 727 struct hci_dev *hdev = conn->hcon->hdev;
5d88cc73 728 struct smp_chan *smp = chan->data;
1c1def09 729
49c06c9e
ŁR		 730 if (conn->hcon->pending_sec_level == BT_SECURITY_FIPS &&
731 max_key_size != SMP_MAX_ENC_KEY_SIZE)
732 return SMP_ENC_KEY_SIZE;
733
30d65e08 734 if (max_key_size > hdev->le_max_key_size ||
2fd36558 735 max_key_size < SMP_MIN_ENC_KEY_SIZE)
3158c50c
VCG		 736 return SMP_ENC_KEY_SIZE;
737
f7aa611a 738 smp->enc_key_size = max_key_size;
3158c50c
VCG		 739
740 return 0;
741}
742
6f48e260
JH		 743static void smp_chan_destroy(struct l2cap_conn *conn)
744{
745 struct l2cap_chan *chan = conn->smp;
746 struct smp_chan *smp = chan->data;
923e2414 747 struct hci_conn *hcon = conn->hcon;
6f48e260
JH		 748 bool complete;
749
750 BUG_ON(!smp);
751
752 cancel_delayed_work_sync(&smp->security_timer);
6f48e260 753
6f48e260 754 complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
923e2414 755 mgmt_smp_complete(hcon, complete);
6f48e260 756
453431a5 757 kfree_sensitive(smp->csrk);
fad646e1 758 kfree_sensitive(smp->responder_csrk);
453431a5 759 kfree_sensitive(smp->link_key);
6f48e260 760
71af2f6b 761 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 762 crypto_free_kpp(smp->tfm_ecdh);
6f48e260 763
923e2414
JH		 764 /* Ensure that we don't leave any debug key around if debug key
765 * support hasn't been explicitly enabled.
766 */
767 if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG &&
d7a5a11d 768 !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) {
923e2414
JH		 769 list_del_rcu(&smp->ltk->list);
770 kfree_rcu(smp->ltk, rcu);
771 smp->ltk = NULL;
772 }
773
6f48e260
JH		 774 /* If pairing failed clean up any keys we might have */
775 if (!complete) {
776 if (smp->ltk) {
970d0f1b
JH		 777 list_del_rcu(&smp->ltk->list);
778 kfree_rcu(smp->ltk, rcu);
6f48e260
JH		 779 }
780
fad646e1
AP		 781 if (smp->responder_ltk) {
782 list_del_rcu(&smp->responder_ltk->list);
783 kfree_rcu(smp->responder_ltk, rcu);
6f48e260
JH		 784 }
785
786 if (smp->remote_irk) {
adae20cb
JH		 787 list_del_rcu(&smp->remote_irk->list);
788 kfree_rcu(smp->remote_irk, rcu);
6f48e260
JH		 789 }
790 }
791
792 chan->data = NULL;
453431a5 793 kfree_sensitive(smp);
923e2414 794 hci_conn_drop(hcon);
6f48e260
JH		 795}
796
84794e11 797static void smp_failure(struct l2cap_conn *conn, u8 reason)
4f957a76 798{
bab73cb6 799 struct hci_conn *hcon = conn->hcon;
b68fda68 800 struct l2cap_chan *chan = conn->smp;
bab73cb6 801
84794e11 802 if (reason)
4f957a76 803 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
f1560463 804 &reason);
4f957a76 805
e1e930f5 806 mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE);
f1c09c07 807
fc75cc86 808 if (chan->data)
f1c09c07 809 smp_chan_destroy(conn);
4f957a76
BG		 810}
811
2b64d153
BG		 812#define JUST_WORKS 0x00
813#define JUST_CFM 0x01
814#define REQ_PASSKEY 0x02
815#define CFM_PASSKEY 0x03
816#define REQ_OOB 0x04
5e3d3d9b 817#define DSP_PASSKEY 0x05
2b64d153
BG		 818#define OVERLAP 0xFF
819
820static const u8 gen_method[5][5] = {
821 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
822 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
823 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
824 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
825 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
826};
827
5e3d3d9b
JH		 828static const u8 sc_method[5][5] = {
829 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
830 { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
831 { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY },
832 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
833 { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
834};
835
581370cc
JH		 836static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io)
837{
2bcd4003
JH		 838 /* If either side has unknown io_caps, use JUST_CFM (which gets
839 * converted later to JUST_WORKS if we're initiators.
840 */
581370cc
JH		 841 if (local_io > SMP_IO_KEYBOARD_DISPLAY ||
842 remote_io > SMP_IO_KEYBOARD_DISPLAY)
2bcd4003 843 return JUST_CFM;
581370cc 844
5e3d3d9b
JH		 845 if (test_bit(SMP_FLAG_SC, &smp->flags))
846 return sc_method[remote_io][local_io];
847
581370cc
JH		 848 return gen_method[remote_io][local_io];
849}
850
2b64d153
BG		 851static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
852 u8 local_io, u8 remote_io)
853{
854 struct hci_conn *hcon = conn->hcon;
5d88cc73
JH		 855 struct l2cap_chan *chan = conn->smp;
856 struct smp_chan *smp = chan->data;
2b64d153 857 u32 passkey = 0;
d1d900f8 858 int ret;
2b64d153
BG		 859
860 /* Initialize key for JUST WORKS */
861 memset(smp->tk, 0, sizeof(smp->tk));
4a74d658 862 clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153 863
83b4b195 864 bt_dev_dbg(hcon->hdev, "auth:%u lcl:%u rem:%u", auth, local_io,
2e1614f7 865 remote_io);
2b64d153 866
2bcd4003
JH		 867 /* If neither side wants MITM, either "just" confirm an incoming
868 * request or use just-works for outgoing ones. The JUST_CFM
869 * will be converted to JUST_WORKS if necessary later in this
870 * function. If either side has MITM look up the method from the
871 * table.
872 */
581370cc 873 if (!(auth & SMP_AUTH_MITM))
783e0574 874 smp->method = JUST_CFM;
2b64d153 875 else
783e0574 876 smp->method = get_auth_method(smp, local_io, remote_io);
2b64d153 877
a82505c7 878 /* Don't confirm locally initiated pairing attempts */
783e0574
JH		 879 if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
880 &smp->flags))
881 smp->method = JUST_WORKS;
a82505c7 882
02f3e254 883 /* Don't bother user space with no IO capabilities */
783e0574
JH		 884 if (smp->method == JUST_CFM &&
885 hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
886 smp->method = JUST_WORKS;
02f3e254 887
92516cd9
SS		 888 /* If Just Works, Continue with Zero TK and ask user-space for
889 * confirmation */
783e0574 890 if (smp->method == JUST_WORKS) {
d1d900f8 891 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
92516cd9
SS		 892 hcon->type,
893 hcon->dst_type,
894 passkey, 1);
d1d900f8
GR		 895 if (ret)
896 return ret;
92516cd9 897 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2b64d153
BG		 898 return 0;
899 }
900
19c5ce9c
JH		 901 /* If this function is used for SC -> legacy fallback we
902 * can only recover the just-works case.
903 */
904 if (test_bit(SMP_FLAG_SC, &smp->flags))
905 return -EINVAL;
906
2b64d153 907 /* Not Just Works/Confirm results in MITM Authentication */
783e0574 908 if (smp->method != JUST_CFM) {
4a74d658 909 set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
5eb596f5
JH		 910 if (hcon->pending_sec_level < BT_SECURITY_HIGH)
911 hcon->pending_sec_level = BT_SECURITY_HIGH;
912 }
2b64d153 913
74be523c
AP		 914 /* If both devices have Keyboard-Display I/O, the initiator
915 * Confirms and the responder Enters the passkey.
2b64d153 916 */
783e0574 917 if (smp->method == OVERLAP) {
40bef302 918 if (hcon->role == HCI_ROLE_MASTER)
783e0574 919 smp->method = CFM_PASSKEY;
2b64d153 920 else
783e0574 921 smp->method = REQ_PASSKEY;
2b64d153
BG		 922 }
923
01ad34d2 924 /* Generate random passkey. */
783e0574 925 if (smp->method == CFM_PASSKEY) {
943a732a 926 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153
BG		 927 get_random_bytes(&passkey, sizeof(passkey));
928 passkey %= 1000000;
943a732a 929 put_unaligned_le32(passkey, smp->tk);
83b4b195 930 bt_dev_dbg(hcon->hdev, "PassKey: %u", passkey);
4a74d658 931 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 932 }
933
783e0574 934 if (smp->method == REQ_PASSKEY)
ce39fb4e 935 ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst,
272d90df 936 hcon->type, hcon->dst_type);
783e0574 937 else if (smp->method == JUST_CFM)
4eb65e66
JH		 938 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
939 hcon->type, hcon->dst_type,
940 passkey, 1);
2b64d153 941 else
01ad34d2 942 ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst,
272d90df 943 hcon->type, hcon->dst_type,
39adbffe 944 passkey, 0);
2b64d153 945
2b64d153
BG		 946 return ret;
947}
948
1cc61144 949static u8 smp_confirm(struct smp_chan *smp)
8aab4757 950{
8aab4757 951 struct l2cap_conn *conn = smp->conn;
8aab4757
VCG		 952 struct smp_cmd_pairing_confirm cp;
953 int ret;
8aab4757 954
2e1614f7 955 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
8aab4757 956
28a220aa 957 ret = smp_c1(smp->tk, smp->prnd, smp->preq, smp->prsp,
b1cd5fd9 958 conn->hcon->init_addr_type, &conn->hcon->init_addr,
943a732a
JH		 959 conn->hcon->resp_addr_type, &conn->hcon->resp_addr,
960 cp.confirm_val);
1cc61144
JH		 961 if (ret)
962 return SMP_UNSPECIFIED;
8aab4757 963
4a74d658 964 clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153 965
8aab4757
VCG		 966 smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
967
b28b4943
JH		 968 if (conn->hcon->out)
969 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
970 else
971 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
972
1cc61144 973 return 0;
8aab4757
VCG		 974}
975
861580a9 976static u8 smp_random(struct smp_chan *smp)
8aab4757 977{
8aab4757
VCG		 978 struct l2cap_conn *conn = smp->conn;
979 struct hci_conn *hcon = conn->hcon;
861580a9 980 u8 confirm[16];
8aab4757
VCG		 981 int ret;
982
2e1614f7 983 bt_dev_dbg(conn->hcon->hdev, "conn %p %s", conn,
fad646e1 984 conn->hcon->out ? "initiator" : "responder");
8aab4757 985
28a220aa 986 ret = smp_c1(smp->tk, smp->rrnd, smp->preq, smp->prsp,
b1cd5fd9 987 hcon->init_addr_type, &hcon->init_addr,
943a732a 988 hcon->resp_addr_type, &hcon->resp_addr, confirm);
861580a9
JH		 989 if (ret)
990 return SMP_UNSPECIFIED;
8aab4757 991
329d8230 992 if (crypto_memneq(smp->pcnf, confirm, sizeof(smp->pcnf))) {
2064ee33
MH		 993 bt_dev_err(hcon->hdev, "pairing failed "
994 "(confirmation values mismatch)");
861580a9 995 return SMP_CONFIRM_FAILED;
8aab4757
VCG		 996 }
997
998 if (hcon->out) {
fe39c7b2
MH		 999 u8 stk[16];
1000 __le64 rand = 0;
1001 __le16 ediv = 0;
8aab4757 1002
28a220aa 1003 smp_s1(smp->tk, smp->rrnd, smp->prnd, stk);
8aab4757 1004
861580a9
JH		 1005 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
1006 return SMP_UNSPECIFIED;
8aab4757 1007
8b76ce34 1008 hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size);
f7aa611a 1009 hcon->enc_key_size = smp->enc_key_size;
fe59a05f 1010 set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
8aab4757 1011 } else {
fff3490f 1012 u8 stk[16], auth;
fe39c7b2
MH		 1013 __le64 rand = 0;
1014 __le16 ediv = 0;
8aab4757 1015
943a732a
JH		 1016 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
1017 smp->prnd);
8aab4757 1018
28a220aa 1019 smp_s1(smp->tk, smp->prnd, smp->rrnd, stk);
8aab4757 1020
fff3490f
JH		 1021 if (hcon->pending_sec_level == BT_SECURITY_HIGH)
1022 auth = 1;
1023 else
1024 auth = 0;
1025
fad646e1
AP		 1026 /* Even though there's no _RESPONDER suffix this is the
1027 * responder STK we're adding for later lookup (the initiator
7d5843b7
JH		 1028 * STK never needs to be stored).
1029 */
ce39fb4e 1030 hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
2ceba539 1031 SMP_STK, auth, stk, smp->enc_key_size, ediv, rand);
8aab4757
VCG		 1032 }
1033
861580a9 1034 return 0;
8aab4757
VCG		 1035}
1036
44f1a7ab
JH		 1037static void smp_notify_keys(struct l2cap_conn *conn)
1038{
1039 struct l2cap_chan *chan = conn->smp;
1040 struct smp_chan *smp = chan->data;
1041 struct hci_conn *hcon = conn->hcon;
1042 struct hci_dev *hdev = hcon->hdev;
1043 struct smp_cmd_pairing *req = (void *) &smp->preq[1];
1044 struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1];
1045 bool persistent;
1046
cad20c27
JH		 1047 if (hcon->type == ACL_LINK) {
1048 if (hcon->key_type == HCI_LK_DEBUG_COMBINATION)
1049 persistent = false;
1050 else
1051 persistent = !test_bit(HCI_CONN_FLUSH_KEY,
1052 &hcon->flags);
1053 } else {
1054 /* The LTKs, IRKs and CSRKs should be persistent only if
1055 * both sides had the bonding bit set in their
1056 * authentication requests.
1057 */
1058 persistent = !!((req->auth_req & rsp->auth_req) &
1059 SMP_AUTH_BONDING);
1060 }
1061
44f1a7ab 1062 if (smp->remote_irk) {
cad20c27
JH		 1063 mgmt_new_irk(hdev, smp->remote_irk, persistent);
1064
44f1a7ab
JH		 1065 /* Now that user space can be considered to know the
1066 * identity address track the connection based on it
b5ae344d 1067 * from now on (assuming this is an LE link).
44f1a7ab 1068 */
b5ae344d
JH		 1069 if (hcon->type == LE_LINK) {
1070 bacpy(&hcon->dst, &smp->remote_irk->bdaddr);
1071 hcon->dst_type = smp->remote_irk->addr_type;
b8b23001
LAD		 1072 /* Use a short delay to make sure the new address is
1073 * propagated _before_ the channels.
1074 */
1075 queue_delayed_work(hdev->workqueue,
1076 &conn->id_addr_timer,
1077 ID_ADDR_TIMEOUT);
b5ae344d 1078 }
44f1a7ab
JH		 1079 }
1080
44f1a7ab
JH		 1081 if (smp->csrk) {
1082 smp->csrk->bdaddr_type = hcon->dst_type;
1083 bacpy(&smp->csrk->bdaddr, &hcon->dst);
1084 mgmt_new_csrk(hdev, smp->csrk, persistent);
1085 }
1086
fad646e1
AP		 1087 if (smp->responder_csrk) {
1088 smp->responder_csrk->bdaddr_type = hcon->dst_type;
1089 bacpy(&smp->responder_csrk->bdaddr, &hcon->dst);
1090 mgmt_new_csrk(hdev, smp->responder_csrk, persistent);
44f1a7ab
JH		 1091 }
1092
1093 if (smp->ltk) {
1094 smp->ltk->bdaddr_type = hcon->dst_type;
1095 bacpy(&smp->ltk->bdaddr, &hcon->dst);
1096 mgmt_new_ltk(hdev, smp->ltk, persistent);
1097 }
1098
fad646e1
AP		 1099 if (smp->responder_ltk) {
1100 smp->responder_ltk->bdaddr_type = hcon->dst_type;
1101 bacpy(&smp->responder_ltk->bdaddr, &hcon->dst);
1102 mgmt_new_ltk(hdev, smp->responder_ltk, persistent);
44f1a7ab 1103 }
6a77083a
JH		 1104
1105 if (smp->link_key) {
e3befab9
JH		 1106 struct link_key *key;
1107 u8 type;
1108
1109 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1110 type = HCI_LK_DEBUG_COMBINATION;
1111 else if (hcon->sec_level == BT_SECURITY_FIPS)
1112 type = HCI_LK_AUTH_COMBINATION_P256;
1113 else
1114 type = HCI_LK_UNAUTH_COMBINATION_P256;
1115
1116 key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst,
1117 smp->link_key, type, 0, &persistent);
1118 if (key) {
1119 mgmt_new_link_key(hdev, key, persistent);
1120
1121 /* Don't keep debug keys around if the relevant
1122 * flag is not set.
1123 */
d7a5a11d 1124 if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) &&
e3befab9
JH		 1125 key->type == HCI_LK_DEBUG_COMBINATION) {
1126 list_del_rcu(&key->list);
1127 kfree_rcu(key, rcu);
1128 }
1129 }
6a77083a
JH		 1130 }
1131}
1132
d3e54a87
JH		 1133static void sc_add_ltk(struct smp_chan *smp)
1134{
1135 struct hci_conn *hcon = smp->conn->hcon;
1136 u8 key_type, auth;
1137
1138 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1139 key_type = SMP_LTK_P256_DEBUG;
1140 else
1141 key_type = SMP_LTK_P256;
1142
1143 if (hcon->pending_sec_level == BT_SECURITY_FIPS)
1144 auth = 1;
1145 else
1146 auth = 0;
1147
d3e54a87
JH		 1148 smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
1149 key_type, auth, smp->tk, smp->enc_key_size,
1150 0, 0);
1151}
1152
6a77083a
JH		 1153static void sc_generate_link_key(struct smp_chan *smp)
1154{
a62da6f1 1155 /* From core spec. Spells out in ASCII as 'lebr'. */
6a77083a
JH		 1156 const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c };
1157
1158 smp->link_key = kzalloc(16, GFP_KERNEL);
1159 if (!smp->link_key)
1160 return;
1161
a62da6f1 1162 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
151129df 1163 /* SALT = 0x000000000000000000000000746D7031 */
a62da6f1
JH		 1164 const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 };
1165
1166 if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) {
453431a5 1167 kfree_sensitive(smp->link_key);
a62da6f1
JH		 1168 smp->link_key = NULL;
1169 return;
1170 }
1171 } else {
1172 /* From core spec. Spells out in ASCII as 'tmp1'. */
1173 const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 };
1174
1175 if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) {
453431a5 1176 kfree_sensitive(smp->link_key);
a62da6f1
JH		 1177 smp->link_key = NULL;
1178 return;
1179 }
6a77083a
JH		 1180 }
1181
1182 if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) {
453431a5 1183 kfree_sensitive(smp->link_key);
6a77083a
JH		 1184 smp->link_key = NULL;
1185 return;
1186 }
44f1a7ab
JH		 1187}
1188
b28b4943
JH		 1189static void smp_allow_key_dist(struct smp_chan *smp)
1190{
1191 /* Allow the first expected phase 3 PDU. The rest of the PDUs
1192 * will be allowed in each PDU handler to ensure we receive
1193 * them in the correct order.
1194 */
1195 if (smp->remote_key_dist & SMP_DIST_ENC_KEY)
1196 SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO);
1197 else if (smp->remote_key_dist & SMP_DIST_ID_KEY)
1198 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
1199 else if (smp->remote_key_dist & SMP_DIST_SIGN)
1200 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
1201}
1202
b5ae344d
JH		 1203static void sc_generate_ltk(struct smp_chan *smp)
1204{
a62da6f1 1205 /* From core spec. Spells out in ASCII as 'brle'. */
b5ae344d
JH		 1206 const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 };
1207 struct hci_conn *hcon = smp->conn->hcon;
1208 struct hci_dev *hdev = hcon->hdev;
1209 struct link_key *key;
1210
1211 key = hci_find_link_key(hdev, &hcon->dst);
1212 if (!key) {
2064ee33 1213 bt_dev_err(hdev, "no Link Key found to generate LTK");
b5ae344d
JH		 1214 return;
1215 }
1216
1217 if (key->type == HCI_LK_DEBUG_COMBINATION)
1218 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1219
a62da6f1 1220 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
151129df 1221 /* SALT = 0x000000000000000000000000746D7032 */
a62da6f1
JH		 1222 const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 };
1223
1224 if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk))
1225 return;
1226 } else {
1227 /* From core spec. Spells out in ASCII as 'tmp2'. */
1228 const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 };
1229
1230 if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk))
1231 return;
1232 }
b5ae344d
JH		 1233
1234 if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk))
1235 return;
1236
1237 sc_add_ltk(smp);
1238}
1239
d6268e86 1240static void smp_distribute_keys(struct smp_chan *smp)
44f1a7ab
JH		 1241{
1242 struct smp_cmd_pairing *req, *rsp;
86d1407c 1243 struct l2cap_conn *conn = smp->conn;
44f1a7ab
JH		 1244 struct hci_conn *hcon = conn->hcon;
1245 struct hci_dev *hdev = hcon->hdev;
1246 __u8 *keydist;
1247
2e1614f7 1248 bt_dev_dbg(hdev, "conn %p", conn);
44f1a7ab 1249
44f1a7ab
JH		 1250 rsp = (void *) &smp->prsp[1];
1251
1252 /* The responder sends its keys first */
b28b4943
JH		 1253 if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) {
1254 smp_allow_key_dist(smp);
86d1407c 1255 return;
b28b4943 1256 }
44f1a7ab
JH		 1257
1258 req = (void *) &smp->preq[1];
1259
1260 if (hcon->out) {
1261 keydist = &rsp->init_key_dist;
1262 *keydist &= req->init_key_dist;
1263 } else {
1264 keydist = &rsp->resp_key_dist;
1265 *keydist &= req->resp_key_dist;
1266 }
1267
6a77083a 1268 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
b5ae344d 1269 if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY))
6a77083a 1270 sc_generate_link_key(smp);
b5ae344d
JH		 1271 if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY))
1272 sc_generate_ltk(smp);
6a77083a
JH		 1273
1274 /* Clear the keys which are generated but not distributed */
1275 *keydist &= ~SMP_SC_NO_DIST;
1276 }
1277
2e1614f7 1278 bt_dev_dbg(hdev, "keydist 0x%x", *keydist);
44f1a7ab
JH		 1279
1280 if (*keydist & SMP_DIST_ENC_KEY) {
1281 struct smp_cmd_encrypt_info enc;
fad646e1 1282 struct smp_cmd_initiator_ident ident;
44f1a7ab
JH		 1283 struct smp_ltk *ltk;
1284 u8 authenticated;
1285 __le16 ediv;
1286 __le64 rand;
1287
1fc62c52
JH		 1288 /* Make sure we generate only the significant amount of
1289 * bytes based on the encryption key size, and set the rest
1290 * of the value to zeroes.
1291 */
1292 get_random_bytes(enc.ltk, smp->enc_key_size);
1293 memset(enc.ltk + smp->enc_key_size, 0,
1294 sizeof(enc.ltk) - smp->enc_key_size);
1295
44f1a7ab
JH		 1296 get_random_bytes(&ediv, sizeof(ediv));
1297 get_random_bytes(&rand, sizeof(rand));
1298
1299 smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
1300
1301 authenticated = hcon->sec_level == BT_SECURITY_HIGH;
1302 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type,
fad646e1 1303 SMP_LTK_RESPONDER, authenticated, enc.ltk,
44f1a7ab 1304 smp->enc_key_size, ediv, rand);
fad646e1 1305 smp->responder_ltk = ltk;
44f1a7ab
JH		 1306
1307 ident.ediv = ediv;
1308 ident.rand = rand;
1309
fad646e1
AP		 1310 smp_send_cmd(conn, SMP_CMD_INITIATOR_IDENT, sizeof(ident),
1311 &ident);
44f1a7ab
JH		 1312
1313 *keydist &= ~SMP_DIST_ENC_KEY;
1314 }
1315
1316 if (*keydist & SMP_DIST_ID_KEY) {
1317 struct smp_cmd_ident_addr_info addrinfo;
1318 struct smp_cmd_ident_info idinfo;
1319
1320 memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk));
1321
1322 smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
1323
1324 /* The hci_conn contains the local identity address
1325 * after the connection has been established.
1326 *
1327 * This is true even when the connection has been
1328 * established using a resolvable random address.
1329 */
1330 bacpy(&addrinfo.bdaddr, &hcon->src);
1331 addrinfo.addr_type = hcon->src_type;
1332
1333 smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
1334 &addrinfo);
1335
1336 *keydist &= ~SMP_DIST_ID_KEY;
1337 }
1338
1339 if (*keydist & SMP_DIST_SIGN) {
1340 struct smp_cmd_sign_info sign;
1341 struct smp_csrk *csrk;
1342
1343 /* Generate a new random key */
1344 get_random_bytes(sign.csrk, sizeof(sign.csrk));
1345
1346 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
1347 if (csrk) {
4cd3928a
JH		 1348 if (hcon->sec_level > BT_SECURITY_MEDIUM)
1349 csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED;
1350 else
1351 csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED;
44f1a7ab
JH		 1352 memcpy(csrk->val, sign.csrk, sizeof(csrk->val));
1353 }
fad646e1 1354 smp->responder_csrk = csrk;
44f1a7ab
JH		 1355
1356 smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
1357
1358 *keydist &= ~SMP_DIST_SIGN;
1359 }
1360
1361 /* If there are still keys to be received wait for them */
b28b4943
JH		 1362 if (smp->remote_key_dist & KEY_DIST_MASK) {
1363 smp_allow_key_dist(smp);
86d1407c 1364 return;
b28b4943 1365 }
44f1a7ab 1366
44f1a7ab
JH		 1367 set_bit(SMP_FLAG_COMPLETE, &smp->flags);
1368 smp_notify_keys(conn);
1369
1370 smp_chan_destroy(conn);
44f1a7ab
JH		 1371}
1372
b68fda68
JH		 1373static void smp_timeout(struct work_struct *work)
1374{
1375 struct smp_chan *smp = container_of(work, struct smp_chan,
1376 security_timer.work);
1377 struct l2cap_conn *conn = smp->conn;
1378
2e1614f7 1379 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
b68fda68 1380
1e91c29e 1381 hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM);
b68fda68
JH		 1382}
1383
8aab4757
VCG		 1384static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
1385{
2e1614f7 1386 struct hci_conn *hcon = conn->hcon;
5d88cc73 1387 struct l2cap_chan *chan = conn->smp;
8aab4757
VCG		 1388 struct smp_chan *smp;
1389
f1560463 1390 smp = kzalloc(sizeof(*smp), GFP_ATOMIC);
fc75cc86 1391 if (!smp)
8aab4757
VCG		 1392 return NULL;
1393
71af2f6b 1394 smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
407cecf6 1395 if (IS_ERR(smp->tfm_cmac)) {
2e1614f7 1396 bt_dev_err(hcon->hdev, "Unable to create CMAC crypto context");
28a220aa 1397 goto zfree_smp;
47eb2ac8
TA		 1398 }
1399
6763f5ea 1400 smp->tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0);
47eb2ac8 1401 if (IS_ERR(smp->tfm_ecdh)) {
2e1614f7 1402 bt_dev_err(hcon->hdev, "Unable to create ECDH crypto context");
47eb2ac8 1403 goto free_shash;
407cecf6
JH		 1404 }
1405
8aab4757 1406 smp->conn = conn;
5d88cc73 1407 chan->data = smp;
8aab4757 1408
b28b4943
JH		 1409 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL);
1410
b68fda68
JH		 1411 INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
1412
2e1614f7 1413 hci_conn_hold(hcon);
8aab4757
VCG		 1414
1415 return smp;
47eb2ac8
TA		 1416
1417free_shash:
1418 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 1419zfree_smp:
453431a5 1420 kfree_sensitive(smp);
47eb2ac8 1421 return NULL;
8aab4757
VCG		 1422}
1423
760b018b
JH		 1424static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16])
1425{
1426 struct hci_conn *hcon = smp->conn->hcon;
1427 u8 *na, *nb, a[7], b[7];
1428
1429 if (hcon->out) {
1430 na = smp->prnd;
1431 nb = smp->rrnd;
1432 } else {
1433 na = smp->rrnd;
1434 nb = smp->prnd;
1435 }
1436
1437 memcpy(a, &hcon->init_addr, 6);
1438 memcpy(b, &hcon->resp_addr, 6);
1439 a[6] = hcon->init_addr_type;
1440 b[6] = hcon->resp_addr_type;
1441
1442 return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk);
1443}
1444
38606f14 1445static void sc_dhkey_check(struct smp_chan *smp)
760b018b
JH		 1446{
1447 struct hci_conn *hcon = smp->conn->hcon;
1448 struct smp_cmd_dhkey_check check;
1449 u8 a[7], b[7], *local_addr, *remote_addr;
1450 u8 io_cap[3], r[16];
1451
760b018b
JH		 1452 memcpy(a, &hcon->init_addr, 6);
1453 memcpy(b, &hcon->resp_addr, 6);
1454 a[6] = hcon->init_addr_type;
1455 b[6] = hcon->resp_addr_type;
1456
1457 if (hcon->out) {
1458 local_addr = a;
1459 remote_addr = b;
1460 memcpy(io_cap, &smp->preq[1], 3);
1461 } else {
1462 local_addr = b;
1463 remote_addr = a;
1464 memcpy(io_cap, &smp->prsp[1], 3);
1465 }
1466
dddd3059
JH		 1467 memset(r, 0, sizeof(r));
1468
1469 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
38606f14 1470 put_unaligned_le32(hcon->passkey_notify, r);
760b018b 1471
a29b0733
JH		 1472 if (smp->method == REQ_OOB)
1473 memcpy(r, smp->rr, 16);
1474
760b018b
JH		 1475 smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
1476 local_addr, remote_addr, check.e);
1477
1478 smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check);
dddd3059
JH		 1479}
1480
38606f14
JH		 1481static u8 sc_passkey_send_confirm(struct smp_chan *smp)
1482{
1483 struct l2cap_conn *conn = smp->conn;
1484 struct hci_conn *hcon = conn->hcon;
1485 struct smp_cmd_pairing_confirm cfm;
1486 u8 r;
1487
1488 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1489 r |= 0x80;
1490
1491 get_random_bytes(smp->prnd, sizeof(smp->prnd));
1492
1493 if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r,
1494 cfm.confirm_val))
1495 return SMP_UNSPECIFIED;
1496
1497 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
1498
1499 return 0;
1500}
1501
1502static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op)
1503{
1504 struct l2cap_conn *conn = smp->conn;
1505 struct hci_conn *hcon = conn->hcon;
1506 struct hci_dev *hdev = hcon->hdev;
1507 u8 cfm[16], r;
1508
1509 /* Ignore the PDU if we've already done 20 rounds (0 - 19) */
1510 if (smp->passkey_round >= 20)
1511 return 0;
1512
1513 switch (smp_op) {
1514 case SMP_CMD_PAIRING_RANDOM:
1515 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1516 r |= 0x80;
1517
1518 if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
1519 smp->rrnd, r, cfm))
1520 return SMP_UNSPECIFIED;
1521
329d8230 1522 if (crypto_memneq(smp->pcnf, cfm, 16))
38606f14
JH		 1523 return SMP_CONFIRM_FAILED;
1524
1525 smp->passkey_round++;
1526
1527 if (smp->passkey_round == 20) {
1528 /* Generate MacKey and LTK */
1529 if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk))
1530 return SMP_UNSPECIFIED;
1531 }
1532
1533 /* The round is only complete when the initiator
1534 * receives pairing random.
1535 */
1536 if (!hcon->out) {
1537 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1538 sizeof(smp->prnd), smp->prnd);
d3e54a87 1539 if (smp->passkey_round == 20)
38606f14 1540 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
d3e54a87 1541 else
38606f14 1542 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
38606f14
JH		 1543 return 0;
1544 }
1545
1546 /* Start the next round */
1547 if (smp->passkey_round != 20)
1548 return sc_passkey_round(smp, 0);
1549
1550 /* Passkey rounds are complete - start DHKey Check */
1551 sc_dhkey_check(smp);
1552 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1553
1554 break;
1555
1556 case SMP_CMD_PAIRING_CONFIRM:
1557 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
1558 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
1559 return 0;
1560 }
1561
1562 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1563
1564 if (hcon->out) {
1565 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1566 sizeof(smp->prnd), smp->prnd);
1567 return 0;
1568 }
1569
1570 return sc_passkey_send_confirm(smp);
1571
1572 case SMP_CMD_PUBLIC_KEY:
1573 default:
1574 /* Initiating device starts the round */
1575 if (!hcon->out)
1576 return 0;
1577
2e1614f7
LAD		 1578 bt_dev_dbg(hdev, "Starting passkey round %u",
1579 smp->passkey_round + 1);
38606f14
JH		 1580
1581 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1582
1583 return sc_passkey_send_confirm(smp);
1584 }
1585
1586 return 0;
1587}
1588
dddd3059
JH		 1589static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey)
1590{
38606f14
JH		 1591 struct l2cap_conn *conn = smp->conn;
1592 struct hci_conn *hcon = conn->hcon;
1593 u8 smp_op;
1594
1595 clear_bit(SMP_FLAG_WAIT_USER, &smp->flags);
1596
dddd3059
JH		 1597 switch (mgmt_op) {
1598 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1599 smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED);
1600 return 0;
1601 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
1602 smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED);
1603 return 0;
38606f14
JH		 1604 case MGMT_OP_USER_PASSKEY_REPLY:
1605 hcon->passkey_notify = le32_to_cpu(passkey);
1606 smp->passkey_round = 0;
1607
1608 if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags))
1609 smp_op = SMP_CMD_PAIRING_CONFIRM;
1610 else
1611 smp_op = 0;
1612
1613 if (sc_passkey_round(smp, smp_op))
1614 return -EIO;
1615
1616 return 0;
dddd3059
JH		 1617 }
1618
d3e54a87
JH		 1619 /* Initiator sends DHKey check first */
1620 if (hcon->out) {
1621 sc_dhkey_check(smp);
1622 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1623 } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) {
1624 sc_dhkey_check(smp);
1625 sc_add_ltk(smp);
1626 }
760b018b
JH		 1627
1628 return 0;
1629}
1630
2b64d153
BG		 1631int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
1632{
b10e8017 1633 struct l2cap_conn *conn = hcon->l2cap_data;
5d88cc73 1634 struct l2cap_chan *chan;
2b64d153
BG		 1635 struct smp_chan *smp;
1636 u32 value;
fc75cc86 1637 int err;
2b64d153 1638
fc75cc86 1639 if (!conn)
2b64d153
BG		 1640 return -ENOTCONN;
1641
0ae8ef67
LAD		 1642 bt_dev_dbg(conn->hcon->hdev, "");
1643
5d88cc73
JH		 1644 chan = conn->smp;
1645 if (!chan)
1646 return -ENOTCONN;
1647
fc75cc86
JH		 1648 l2cap_chan_lock(chan);
1649 if (!chan->data) {
1650 err = -ENOTCONN;
1651 goto unlock;
1652 }
1653
5d88cc73 1654 smp = chan->data;
2b64d153 1655
760b018b
JH		 1656 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1657 err = sc_user_reply(smp, mgmt_op, passkey);
1658 goto unlock;
1659 }
1660
2b64d153
BG		 1661 switch (mgmt_op) {
1662 case MGMT_OP_USER_PASSKEY_REPLY:
1663 value = le32_to_cpu(passkey);
943a732a 1664 memset(smp->tk, 0, sizeof(smp->tk));
83b4b195 1665 bt_dev_dbg(conn->hcon->hdev, "PassKey: %u", value);
943a732a 1666 put_unaligned_le32(value, smp->tk);
19186c7b 1667 fallthrough;
2b64d153 1668 case MGMT_OP_USER_CONFIRM_REPLY:
4a74d658 1669 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 1670 break;
1671 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1672 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
84794e11 1673 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1674 err = 0;
1675 goto unlock;
2b64d153 1676 default:
84794e11 1677 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1678 err = -EOPNOTSUPP;
1679 goto unlock;
2b64d153
BG		 1680 }
1681
fc75cc86
JH		 1682 err = 0;
1683
2b64d153 1684 /* If it is our turn to send Pairing Confirm, do so now */
1cc61144
JH		 1685 if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
1686 u8 rsp = smp_confirm(smp);
1687 if (rsp)
1688 smp_failure(conn, rsp);
1689 }
2b64d153 1690
fc75cc86
JH		 1691unlock:
1692 l2cap_chan_unlock(chan);
1693 return err;
2b64d153
BG		 1694}
1695
b5ae344d
JH		 1696static void build_bredr_pairing_cmd(struct smp_chan *smp,
1697 struct smp_cmd_pairing *req,
1698 struct smp_cmd_pairing *rsp)
1699{
1700 struct l2cap_conn *conn = smp->conn;
1701 struct hci_dev *hdev = conn->hcon->hdev;
1702 u8 local_dist = 0, remote_dist = 0;
1703
d7a5a11d 1704 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
b5ae344d
JH		 1705 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1706 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1707 }
1708
d7a5a11d 1709 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
b5ae344d
JH		 1710 remote_dist |= SMP_DIST_ID_KEY;
1711
d7a5a11d 1712 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
b5ae344d
JH		 1713 local_dist |= SMP_DIST_ID_KEY;
1714
1715 if (!rsp) {
1716 memset(req, 0, sizeof(*req));
1717
a62da6f1 1718 req->auth_req = SMP_AUTH_CT2;
b5ae344d
JH		 1719 req->init_key_dist = local_dist;
1720 req->resp_key_dist = remote_dist;
e3f6a257 1721 req->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1722
1723 smp->remote_key_dist = remote_dist;
1724
1725 return;
1726 }
1727
1728 memset(rsp, 0, sizeof(*rsp));
1729
a62da6f1 1730 rsp->auth_req = SMP_AUTH_CT2;
e3f6a257 1731 rsp->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1732 rsp->init_key_dist = req->init_key_dist & remote_dist;
1733 rsp->resp_key_dist = req->resp_key_dist & local_dist;
1734
1735 smp->remote_key_dist = rsp->init_key_dist;
1736}
1737
da85e5e5 1738static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1739{
3158c50c 1740 struct smp_cmd_pairing rsp, *req = (void *) skb->data;
fc75cc86 1741 struct l2cap_chan *chan = conn->smp;
b3c6410b 1742 struct hci_dev *hdev = conn->hcon->hdev;
8aab4757 1743 struct smp_chan *smp;
c7262e71 1744 u8 key_size, auth, sec_level;
8aab4757 1745 int ret;
88ba43b6 1746
2e1614f7 1747 bt_dev_dbg(hdev, "conn %p", conn);
88ba43b6 1748
c46b98be 1749 if (skb->len < sizeof(*req))
38e4a915 1750 return SMP_INVALID_PARAMS;
c46b98be 1751
40bef302 1752 if (conn->hcon->role != HCI_ROLE_SLAVE)
2b64d153
BG		 1753 return SMP_CMD_NOTSUPP;
1754
fc75cc86 1755 if (!chan->data)
8aab4757 1756 smp = smp_chan_create(conn);
fc75cc86 1757 else
5d88cc73 1758 smp = chan->data;
8aab4757 1759
d08fd0e7
AE		 1760 if (!smp)
1761 return SMP_UNSPECIFIED;
d26a2345 1762
c05b9339 1763 /* We didn't start the pairing, so match remote */
0edb14de 1764 auth = req->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1765
d7a5a11d 1766 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 1767 (auth & SMP_AUTH_BONDING))
b3c6410b
JH		 1768 return SMP_PAIRING_NOTSUPP;
1769
d7a5a11d 1770 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1771 return SMP_AUTH_REQUIREMENTS;
1772
1c1def09
VCG		 1773 smp->preq[0] = SMP_CMD_PAIRING_REQ;
1774 memcpy(&smp->preq[1], req, sizeof(*req));
3158c50c 1775 skb_pull(skb, sizeof(*req));
88ba43b6 1776
cb06d366
JH		 1777 /* If the remote side's OOB flag is set it means it has
1778 * successfully received our local OOB data - therefore set the
1779 * flag to indicate that local OOB is in use.
1780 */
94f14e47 1781 if (req->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob)
58428563
JH		 1782 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1783
b5ae344d
JH		 1784 /* SMP over BR/EDR requires special treatment */
1785 if (conn->hcon->type == ACL_LINK) {
1786 /* We must have a BR/EDR SC link */
08f63cc5 1787 if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) &&
b7cb93e5 1788 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 1789 return SMP_CROSS_TRANSP_NOT_ALLOWED;
1790
1791 set_bit(SMP_FLAG_SC, &smp->flags);
1792
1793 build_bredr_pairing_cmd(smp, req, &rsp);
1794
a62da6f1
JH		 1795 if (req->auth_req & SMP_AUTH_CT2)
1796 set_bit(SMP_FLAG_CT2, &smp->flags);
1797
b5ae344d
JH		 1798 key_size = min(req->max_key_size, rsp.max_key_size);
1799 if (check_enc_key_size(conn, key_size))
1800 return SMP_ENC_KEY_SIZE;
1801
1802 /* Clear bits which are generated but not distributed */
1803 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1804
1805 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1806 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
1807 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
1808
1809 smp_distribute_keys(smp);
1810 return 0;
1811 }
1812
5e3d3d9b
JH		 1813 build_pairing_cmd(conn, req, &rsp, auth);
1814
a62da6f1 1815 if (rsp.auth_req & SMP_AUTH_SC) {
5e3d3d9b
JH		 1816 set_bit(SMP_FLAG_SC, &smp->flags);
1817
a62da6f1
JH		 1818 if (rsp.auth_req & SMP_AUTH_CT2)
1819 set_bit(SMP_FLAG_CT2, &smp->flags);
1820 }
1821
5be5e275 1822 if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 1823 sec_level = BT_SECURITY_MEDIUM;
1824 else
1825 sec_level = authreq_to_seclevel(auth);
1826
c7262e71
JH		 1827 if (sec_level > conn->hcon->pending_sec_level)
1828 conn->hcon->pending_sec_level = sec_level;
fdde0a26 1829
49c922bb 1830 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1831 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1832 u8 method;
1833
1834 method = get_auth_method(smp, conn->hcon->io_capability,
1835 req->io_capability);
1836 if (method == JUST_WORKS || method == JUST_CFM)
1837 return SMP_AUTH_REQUIREMENTS;
1838 }
1839
3158c50c
VCG		 1840 key_size = min(req->max_key_size, rsp.max_key_size);
1841 if (check_enc_key_size(conn, key_size))
1842 return SMP_ENC_KEY_SIZE;
88ba43b6 1843
e84a6b13 1844 get_random_bytes(smp->prnd, sizeof(smp->prnd));
8aab4757 1845
1c1def09
VCG		 1846 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1847 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
f01ead31 1848
3158c50c 1849 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
3b19146d
JH		 1850
1851 clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
1852
19c5ce9c
JH		 1853 /* Strictly speaking we shouldn't allow Pairing Confirm for the
1854 * SC case, however some implementations incorrectly copy RFU auth
1855 * req bits from our security request, which may create a false
1856 * positive SC enablement.
1857 */
1858 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1859
3b19146d
JH		 1860 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1861 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1862 /* Clear bits which are generated but not distributed */
1863 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1864 /* Wait for Public Key from Initiating Device */
1865 return 0;
3b19146d 1866 }
da85e5e5 1867
2b64d153
BG		 1868 /* Request setup of TK */
1869 ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
1870 if (ret)
1871 return SMP_UNSPECIFIED;
1872
da85e5e5 1873 return 0;
88ba43b6
AB		 1874}
1875
3b19146d
JH		 1876static u8 sc_send_public_key(struct smp_chan *smp)
1877{
70157ef5
JH		 1878 struct hci_dev *hdev = smp->conn->hcon->hdev;
1879
56860245 1880 bt_dev_dbg(hdev, "");
3b19146d 1881
1a8bab4f 1882 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
33d0c030
MH		 1883 struct l2cap_chan *chan = hdev->smp_data;
1884 struct smp_dev *smp_dev;
1885
1886 if (!chan || !chan->data)
1887 return SMP_UNSPECIFIED;
1888
1889 smp_dev = chan->data;
1890
1891 memcpy(smp->local_pk, smp_dev->local_pk, 64);
fb334fee 1892 memcpy(smp->lr, smp_dev->local_rand, 16);
33d0c030
MH		 1893
1894 if (smp_dev->debug_key)
1895 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1896
1897 goto done;
1898 }
1899
d7a5a11d 1900 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
2e1614f7 1901 bt_dev_dbg(hdev, "Using debug keys");
c0153b0b
TA		 1902 if (set_ecdh_privkey(smp->tfm_ecdh, debug_sk))
1903 return SMP_UNSPECIFIED;
70157ef5 1904 memcpy(smp->local_pk, debug_pk, 64);
70157ef5
JH		 1905 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1906 } else {
1907 while (true) {
c0153b0b
TA		 1908 /* Generate key pair for Secure Connections */
1909 if (generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk))
70157ef5 1910 return SMP_UNSPECIFIED;
6c0dcc50 1911
70157ef5 1912 /* This is unlikely, but we need to check that
91641b79 1913 * we didn't accidentally generate a debug key.
70157ef5 1914 */
c0153b0b 1915 if (crypto_memneq(smp->local_pk, debug_pk, 64))
70157ef5
JH		 1916 break;
1917 }
6c0dcc50 1918 }
3b19146d 1919
33d0c030 1920done:
c7a3d57d 1921 SMP_DBG("Local Public Key X: %32phN", smp->local_pk);
8e4e2ee5 1922 SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32);
3b19146d
JH		 1923
1924 smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk);
1925
1926 return 0;
1927}
1928
da85e5e5 1929static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1930{
3158c50c 1931 struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
5d88cc73
JH		 1932 struct l2cap_chan *chan = conn->smp;
1933 struct smp_chan *smp = chan->data;
0edb14de 1934 struct hci_dev *hdev = conn->hcon->hdev;
3a7dbfb8 1935 u8 key_size, auth;
7d24ddcc 1936 int ret;
88ba43b6 1937
2e1614f7 1938 bt_dev_dbg(hdev, "conn %p", conn);
88ba43b6 1939
c46b98be 1940 if (skb->len < sizeof(*rsp))
38e4a915 1941 return SMP_INVALID_PARAMS;
c46b98be 1942
40bef302 1943 if (conn->hcon->role != HCI_ROLE_MASTER)
2b64d153
BG		 1944 return SMP_CMD_NOTSUPP;
1945
3158c50c
VCG		 1946 skb_pull(skb, sizeof(*rsp));
1947
1c1def09 1948 req = (void *) &smp->preq[1];
da85e5e5 1949
3158c50c
VCG		 1950 key_size = min(req->max_key_size, rsp->max_key_size);
1951 if (check_enc_key_size(conn, key_size))
1952 return SMP_ENC_KEY_SIZE;
1953
0edb14de 1954 auth = rsp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1955
d7a5a11d 1956 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1957 return SMP_AUTH_REQUIREMENTS;
1958
cb06d366
JH		 1959 /* If the remote side's OOB flag is set it means it has
1960 * successfully received our local OOB data - therefore set the
1961 * flag to indicate that local OOB is in use.
1962 */
94f14e47 1963 if (rsp->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob)
58428563
JH		 1964 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1965
b5ae344d
JH		 1966 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1967 memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
1968
1969 /* Update remote key distribution in case the remote cleared
1970 * some bits that we had enabled in our request.
1971 */
1972 smp->remote_key_dist &= rsp->resp_key_dist;
1973
a62da6f1
JH		 1974 if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2))
1975 set_bit(SMP_FLAG_CT2, &smp->flags);
1976
b5ae344d
JH		 1977 /* For BR/EDR this means we're done and can start phase 3 */
1978 if (conn->hcon->type == ACL_LINK) {
1979 /* Clear bits which are generated but not distributed */
1980 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1981 smp_distribute_keys(smp);
1982 return 0;
1983 }
1984
65668776
JH		 1985 if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC))
1986 set_bit(SMP_FLAG_SC, &smp->flags);
d2eb9e10
JH		 1987 else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH)
1988 conn->hcon->pending_sec_level = BT_SECURITY_HIGH;
65668776 1989
49c922bb 1990 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1991 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1992 u8 method;
1993
1994 method = get_auth_method(smp, req->io_capability,
1995 rsp->io_capability);
1996 if (method == JUST_WORKS || method == JUST_CFM)
1997 return SMP_AUTH_REQUIREMENTS;
1998 }
1999
e84a6b13 2000 get_random_bytes(smp->prnd, sizeof(smp->prnd));
7d24ddcc 2001
fdcc4bec
JH		 2002 /* Update remote key distribution in case the remote cleared
2003 * some bits that we had enabled in our request.
2004 */
2005 smp->remote_key_dist &= rsp->resp_key_dist;
2006
3b19146d
JH		 2007 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2008 /* Clear bits which are generated but not distributed */
2009 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
2010 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
2011 return sc_send_public_key(smp);
2012 }
2013
c05b9339 2014 auth |= req->auth_req;
2b64d153 2015
476585ec 2016 ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
2b64d153
BG		 2017 if (ret)
2018 return SMP_UNSPECIFIED;
2019
4a74d658 2020 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153
BG		 2021
2022 /* Can't compose response until we have been confirmed */
4a74d658 2023 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2024 return smp_confirm(smp);
da85e5e5
VCG		 2025
2026 return 0;
88ba43b6
AB		 2027}
2028
dcee2b32
JH		 2029static u8 sc_check_confirm(struct smp_chan *smp)
2030{
2031 struct l2cap_conn *conn = smp->conn;
2032
2e1614f7 2033 bt_dev_dbg(conn->hcon->hdev, "");
dcee2b32 2034
38606f14
JH		 2035 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2036 return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM);
2037
dcee2b32
JH		 2038 if (conn->hcon->out) {
2039 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2040 smp->prnd);
2041 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2042 }
2043
2044 return 0;
2045}
2046
19c5ce9c
JH		 2047/* Work-around for some implementations that incorrectly copy RFU bits
2048 * from our security request and thereby create the impression that
2049 * we're doing SC when in fact the remote doesn't support it.
2050 */
2051static int fixup_sc_false_positive(struct smp_chan *smp)
2052{
2053 struct l2cap_conn *conn = smp->conn;
2054 struct hci_conn *hcon = conn->hcon;
2055 struct hci_dev *hdev = hcon->hdev;
2056 struct smp_cmd_pairing *req, *rsp;
2057 u8 auth;
2058
fad646e1 2059 /* The issue is only observed when we're in responder role */
19c5ce9c
JH		 2060 if (hcon->out)
2061 return SMP_UNSPECIFIED;
2062
2063 if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) {
2064ee33 2064 bt_dev_err(hdev, "refusing legacy fallback in SC-only mode");
19c5ce9c
JH		 2065 return SMP_UNSPECIFIED;
2066 }
2067
2064ee33 2068 bt_dev_err(hdev, "trying to fall back to legacy SMP");
19c5ce9c
JH		 2069
2070 req = (void *) &smp->preq[1];
2071 rsp = (void *) &smp->prsp[1];
2072
2073 /* Rebuild key dist flags which may have been cleared for SC */
2074 smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist);
2075
2076 auth = req->auth_req & AUTH_REQ_MASK(hdev);
2077
2078 if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) {
2064ee33 2079 bt_dev_err(hdev, "failed to fall back to legacy SMP");
19c5ce9c
JH		 2080 return SMP_UNSPECIFIED;
2081 }
2082
2083 clear_bit(SMP_FLAG_SC, &smp->flags);
2084
2085 return 0;
2086}
2087
da85e5e5 2088static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2089{
5d88cc73
JH		 2090 struct l2cap_chan *chan = conn->smp;
2091 struct smp_chan *smp = chan->data;
2e1614f7
LAD		 2092 struct hci_conn *hcon = conn->hcon;
2093 struct hci_dev *hdev = hcon->hdev;
7d24ddcc 2094
fad646e1
AP		 2095 bt_dev_dbg(hdev, "conn %p %s", conn,
2096 hcon->out ? "initiator" : "responder");
88ba43b6 2097
c46b98be 2098 if (skb->len < sizeof(smp->pcnf))
38e4a915 2099 return SMP_INVALID_PARAMS;
c46b98be 2100
1c1def09
VCG		 2101 memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
2102 skb_pull(skb, sizeof(smp->pcnf));
88ba43b6 2103
19c5ce9c
JH		 2104 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2105 int ret;
2106
2107 /* Public Key exchange must happen before any other steps */
2108 if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags))
2109 return sc_check_confirm(smp);
2110
2e1614f7 2111 bt_dev_err(hdev, "Unexpected SMP Pairing Confirm");
19c5ce9c
JH		 2112
2113 ret = fixup_sc_false_positive(smp);
2114 if (ret)
2115 return ret;
2116 }
dcee2b32 2117
b28b4943 2118 if (conn->hcon->out) {
943a732a
JH		 2119 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2120 smp->prnd);
b28b4943
JH		 2121 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2122 return 0;
2123 }
2124
2125 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2126 return smp_confirm(smp);
983f9814
MH		 2127
2128 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
da85e5e5
VCG		 2129
2130 return 0;
88ba43b6
AB		 2131}
2132
da85e5e5 2133static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2134{
5d88cc73
JH		 2135 struct l2cap_chan *chan = conn->smp;
2136 struct smp_chan *smp = chan->data;
191dc7fe 2137 struct hci_conn *hcon = conn->hcon;
eed467b5 2138 u8 *pkax, *pkbx, *na, *nb, confirm_hint;
191dc7fe
JH		 2139 u32 passkey;
2140 int err;
7d24ddcc 2141
2e1614f7 2142 bt_dev_dbg(hcon->hdev, "conn %p", conn);
3158c50c 2143
c46b98be 2144 if (skb->len < sizeof(smp->rrnd))
38e4a915 2145 return SMP_INVALID_PARAMS;
c46b98be 2146
943a732a 2147 memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
8aab4757 2148 skb_pull(skb, sizeof(smp->rrnd));
e7e62c85 2149
191dc7fe
JH		 2150 if (!test_bit(SMP_FLAG_SC, &smp->flags))
2151 return smp_random(smp);
2152
580039e8
JH		 2153 if (hcon->out) {
2154 pkax = smp->local_pk;
2155 pkbx = smp->remote_pk;
2156 na = smp->prnd;
2157 nb = smp->rrnd;
2158 } else {
2159 pkax = smp->remote_pk;
2160 pkbx = smp->local_pk;
2161 na = smp->rrnd;
2162 nb = smp->prnd;
2163 }
2164
a29b0733
JH		 2165 if (smp->method == REQ_OOB) {
2166 if (!hcon->out)
2167 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2168 sizeof(smp->prnd), smp->prnd);
2169 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2170 goto mackey_and_ltk;
2171 }
2172
38606f14
JH		 2173 /* Passkey entry has special treatment */
2174 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2175 return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
2176
191dc7fe
JH		 2177 if (hcon->out) {
2178 u8 cfm[16];
2179
2180 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
2181 smp->rrnd, 0, cfm);
2182 if (err)
2183 return SMP_UNSPECIFIED;
2184
329d8230 2185 if (crypto_memneq(smp->pcnf, cfm, 16))
191dc7fe 2186 return SMP_CONFIRM_FAILED;
191dc7fe
JH		 2187 } else {
2188 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2189 smp->prnd);
2190 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
cee5f20f
HC		 2191
2192 /* Only Just-Works pairing requires extra checks */
2193 if (smp->method != JUST_WORKS)
2194 goto mackey_and_ltk;
2195
2196 /* If there already exists long term key in local host, leave
2197 * the decision to user space since the remote device could
2198 * be legitimate or malicious.
2199 */
2200 if (hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
2201 hcon->role)) {
eed467b5
HC		 2202 /* Set passkey to 0. The value can be any number since
2203 * it'll be ignored anyway.
2204 */
2205 passkey = 0;
2206 confirm_hint = 1;
2207 goto confirm;
cee5f20f 2208 }
191dc7fe
JH		 2209 }
2210
a29b0733 2211mackey_and_ltk:
760b018b
JH		 2212 /* Generate MacKey and LTK */
2213 err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
2214 if (err)
2215 return SMP_UNSPECIFIED;
2216
ffee202a 2217 if (smp->method == REQ_OOB) {
dddd3059 2218 if (hcon->out) {
38606f14 2219 sc_dhkey_check(smp);
dddd3059
JH		 2220 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2221 }
2222 return 0;
2223 }
2224
38606f14
JH		 2225 err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
2226 if (err)
2227 return SMP_UNSPECIFIED;
2228
eed467b5
HC		 2229 confirm_hint = 0;
2230
2231confirm:
ffee202a
SS		 2232 if (smp->method == JUST_WORKS)
2233 confirm_hint = 1;
2234
38606f14 2235 err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type,
eed467b5 2236 hcon->dst_type, passkey, confirm_hint);
191dc7fe
JH		 2237 if (err)
2238 return SMP_UNSPECIFIED;
2239
38606f14
JH		 2240 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2241
191dc7fe 2242 return 0;
88ba43b6
AB		 2243}
2244
f81cd823 2245static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
988c5997 2246{
c9839a11 2247 struct smp_ltk *key;
988c5997
VCG		 2248 struct hci_conn *hcon = conn->hcon;
2249
f3a73d97 2250 key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role);
988c5997 2251 if (!key)
f81cd823 2252 return false;
988c5997 2253
a6f7833c 2254 if (smp_ltk_sec_level(key) < sec_level)
f81cd823 2255 return false;
4dab7864 2256
51a8efd7 2257 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
f81cd823 2258 return true;
988c5997 2259
8b76ce34 2260 hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size);
c9839a11 2261 hcon->enc_key_size = key->enc_size;
988c5997 2262
fad646e1 2263 /* We never store STKs for initiator role, so clear this flag */
fe59a05f
JH		 2264 clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
2265
f81cd823 2266 return true;
988c5997 2267}
f1560463 2268
35dc6f83
JH		 2269bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
2270 enum smp_key_pref key_pref)
854f4727
JH		 2271{
2272 if (sec_level == BT_SECURITY_LOW)
2273 return true;
2274
35dc6f83
JH		 2275 /* If we're encrypted with an STK but the caller prefers using
2276 * LTK claim insufficient security. This way we allow the
2277 * connection to be re-encrypted with an LTK, even if the LTK
2278 * provides the same level of security. Only exception is if we
2279 * don't have an LTK (e.g. because of key distribution bits).
9ab65d60 2280 */
35dc6f83
JH		 2281 if (key_pref == SMP_USE_LTK &&
2282 test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
f3a73d97 2283 hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role))
9ab65d60
JH		 2284 return false;
2285
854f4727
JH		 2286 if (hcon->sec_level >= sec_level)
2287 return true;
2288
2289 return false;
2290}
2291
da85e5e5 2292static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6
AB		 2293{
2294 struct smp_cmd_security_req *rp = (void *) skb->data;
2295 struct smp_cmd_pairing cp;
f1cb9af5 2296 struct hci_conn *hcon = conn->hcon;
0edb14de 2297 struct hci_dev *hdev = hcon->hdev;
8aab4757 2298 struct smp_chan *smp;
c05b9339 2299 u8 sec_level, auth;
88ba43b6 2300
2e1614f7 2301 bt_dev_dbg(hdev, "conn %p", conn);
88ba43b6 2302
c46b98be 2303 if (skb->len < sizeof(*rp))
38e4a915 2304 return SMP_INVALID_PARAMS;
c46b98be 2305
40bef302 2306 if (hcon->role != HCI_ROLE_MASTER)
86ca9eac
JH		 2307 return SMP_CMD_NOTSUPP;
2308
0edb14de 2309 auth = rp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 2310
d7a5a11d 2311 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 2312 return SMP_AUTH_REQUIREMENTS;
2313
5be5e275 2314 if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 2315 sec_level = BT_SECURITY_MEDIUM;
2316 else
2317 sec_level = authreq_to_seclevel(auth);
2318
64e759f5
SJ		 2319 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) {
2320 /* If link is already encrypted with sufficient security we
2321 * still need refresh encryption as per Core Spec 5.0 Vol 3,
2322 * Part H 2.4.6
2323 */
2324 smp_ltk_encrypt(conn, hcon->sec_level);
854f4727 2325 return 0;
64e759f5 2326 }
854f4727 2327
c7262e71
JH		 2328 if (sec_level > hcon->pending_sec_level)
2329 hcon->pending_sec_level = sec_level;
feb45eb5 2330
4dab7864 2331 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
988c5997
VCG		 2332 return 0;
2333
8aab4757 2334 smp = smp_chan_create(conn);
c29d2444
JH		 2335 if (!smp)
2336 return SMP_UNSPECIFIED;
d26a2345 2337
d7a5a11d 2338 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 2339 (auth & SMP_AUTH_BONDING))
616d55be
JH		 2340 return SMP_PAIRING_NOTSUPP;
2341
88ba43b6 2342 skb_pull(skb, sizeof(*rp));
88ba43b6 2343
da85e5e5 2344 memset(&cp, 0, sizeof(cp));
c05b9339 2345 build_pairing_cmd(conn, &cp, NULL, auth);
88ba43b6 2346
1c1def09
VCG		 2347 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2348 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2349
88ba43b6 2350 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2351 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
f1cb9af5 2352
da85e5e5 2353 return 0;
88ba43b6
AB		 2354}
2355
cc110922 2356int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
eb492e01 2357{
cc110922 2358 struct l2cap_conn *conn = hcon->l2cap_data;
c68b7f12 2359 struct l2cap_chan *chan;
0a66cf20 2360 struct smp_chan *smp;
2b64d153 2361 __u8 authreq;
fc75cc86 2362 int ret;
eb492e01 2363
2e1614f7
LAD		 2364 bt_dev_dbg(hcon->hdev, "conn %p hcon %p level 0x%2.2x", conn, hcon,
2365 sec_level);
3a0259bb 2366
0a66cf20
JH		 2367 /* This may be NULL if there's an unexpected disconnection */
2368 if (!conn)
2369 return 1;
2370
d7a5a11d 2371 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED))
2e65c9d2
AG		 2372 return 1;
2373
35dc6f83 2374 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
eb492e01 2375 return 1;
f1cb9af5 2376
c7262e71
JH		 2377 if (sec_level > hcon->pending_sec_level)
2378 hcon->pending_sec_level = sec_level;
2379
40bef302 2380 if (hcon->role == HCI_ROLE_MASTER)
c7262e71
JH		 2381 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
2382 return 0;
d26a2345 2383
d8949aad
JH		 2384 chan = conn->smp;
2385 if (!chan) {
2064ee33 2386 bt_dev_err(hcon->hdev, "security requested but not available");
d8949aad
JH		 2387 return 1;
2388 }
2389
fc75cc86
JH		 2390 l2cap_chan_lock(chan);
2391
2392 /* If SMP is already in progress ignore this request */
2393 if (chan->data) {
2394 ret = 0;
2395 goto unlock;
2396 }
d26a2345 2397
8aab4757 2398 smp = smp_chan_create(conn);
fc75cc86
JH		 2399 if (!smp) {
2400 ret = 1;
2401 goto unlock;
2402 }
2b64d153
BG		 2403
2404 authreq = seclevel_to_authreq(sec_level);
d26a2345 2405
a62da6f1 2406 if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) {
d2eb9e10 2407 authreq |= SMP_AUTH_SC;
a62da6f1
JH		 2408 if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED))
2409 authreq |= SMP_AUTH_CT2;
2410 }
d2eb9e10 2411
c2aa30db
AP		 2412 /* Don't attempt to set MITM if setting is overridden by debugfs
2413 * Needed to pass certification test SM/MAS/PKE/BV-01-C
2e233644 2414 */
c2aa30db
AP		 2415 if (!hci_dev_test_flag(hcon->hdev, HCI_FORCE_NO_MITM)) {
2416 /* Require MITM if IO Capability allows or the security level
2417 * requires it.
2418 */
2419 if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
2420 hcon->pending_sec_level > BT_SECURITY_MEDIUM)
2421 authreq |= SMP_AUTH_MITM;
2422 }
2e233644 2423
40bef302 2424 if (hcon->role == HCI_ROLE_MASTER) {
d26a2345 2425 struct smp_cmd_pairing cp;
f01ead31 2426
2b64d153 2427 build_pairing_cmd(conn, &cp, NULL, authreq);
1c1def09
VCG		 2428 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2429 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2430
eb492e01 2431 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2432 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
eb492e01
AB		 2433 } else {
2434 struct smp_cmd_security_req cp;
2b64d153 2435 cp.auth_req = authreq;
eb492e01 2436 smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
b28b4943 2437 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ);
eb492e01
AB		 2438 }
2439
4a74d658 2440 set_bit(SMP_FLAG_INITIATOR, &smp->flags);
fc75cc86 2441 ret = 0;
edca792c 2442
fc75cc86
JH		 2443unlock:
2444 l2cap_chan_unlock(chan);
2445 return ret;
eb492e01
AB		 2446}
2447
cb28c306
MK		 2448int smp_cancel_and_remove_pairing(struct hci_dev *hdev, bdaddr_t *bdaddr,
2449 u8 addr_type)
c81d555a 2450{
cb28c306
MK		 2451 struct hci_conn *hcon;
2452 struct l2cap_conn *conn;
c81d555a
JH		 2453 struct l2cap_chan *chan;
2454 struct smp_chan *smp;
cb28c306
MK		 2455 int err;
2456
2457 err = hci_remove_ltk(hdev, bdaddr, addr_type);
2458 hci_remove_irk(hdev, bdaddr, addr_type);
2459
2460 hcon = hci_conn_hash_lookup_le(hdev, bdaddr, addr_type);
2461 if (!hcon)
2462 goto done;
c81d555a 2463
cb28c306 2464 conn = hcon->l2cap_data;
c81d555a 2465 if (!conn)
cb28c306 2466 goto done;
c81d555a
JH		 2467
2468 chan = conn->smp;
2469 if (!chan)
cb28c306 2470 goto done;
c81d555a
JH		 2471
2472 l2cap_chan_lock(chan);
2473
2474 smp = chan->data;
2475 if (smp) {
cb28c306
MK		 2476 /* Set keys to NULL to make sure smp_failure() does not try to
2477 * remove and free already invalidated rcu list entries. */
2478 smp->ltk = NULL;
fad646e1 2479 smp->responder_ltk = NULL;
cb28c306
MK		 2480 smp->remote_irk = NULL;
2481
c81d555a
JH		 2482 if (test_bit(SMP_FLAG_COMPLETE, &smp->flags))
2483 smp_failure(conn, 0);
2484 else
2485 smp_failure(conn, SMP_UNSPECIFIED);
cb28c306 2486 err = 0;
c81d555a
JH		 2487 }
2488
2489 l2cap_chan_unlock(chan);
cb28c306
MK		 2490
2491done:
2492 return err;
c81d555a
JH		 2493}
2494
7034b911
VCG		 2495static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
2496{
16b90839 2497 struct smp_cmd_encrypt_info *rp = (void *) skb->data;
5d88cc73
JH		 2498 struct l2cap_chan *chan = conn->smp;
2499 struct smp_chan *smp = chan->data;
16b90839 2500
2e1614f7 2501 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
c46b98be
JH		 2502
2503 if (skb->len < sizeof(*rp))
38e4a915 2504 return SMP_INVALID_PARAMS;
c46b98be 2505
600a8749
AM		 2506 /* Pairing is aborted if any blocked keys are distributed */
2507 if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_LTK,
2508 rp->ltk)) {
2509 bt_dev_warn_ratelimited(conn->hcon->hdev,
2510 "LTK blocked for %pMR",
2511 &conn->hcon->dst);
2512 return SMP_INVALID_PARAMS;
2513 }
2514
fad646e1 2515 SMP_ALLOW_CMD(smp, SMP_CMD_INITIATOR_IDENT);
6131ddc8 2516
16b90839
VCG		 2517 skb_pull(skb, sizeof(*rp));
2518
1c1def09 2519 memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
16b90839 2520
7034b911
VCG		 2521 return 0;
2522}
2523
fad646e1 2524static int smp_cmd_initiator_ident(struct l2cap_conn *conn, struct sk_buff *skb)
7034b911 2525{
fad646e1 2526 struct smp_cmd_initiator_ident *rp = (void *)skb->data;
5d88cc73
JH		 2527 struct l2cap_chan *chan = conn->smp;
2528 struct smp_chan *smp = chan->data;
c9839a11
VCG		 2529 struct hci_dev *hdev = conn->hcon->hdev;
2530 struct hci_conn *hcon = conn->hcon;
23d0e128 2531 struct smp_ltk *ltk;
c9839a11 2532 u8 authenticated;
16b90839 2533
2e1614f7 2534 bt_dev_dbg(hdev, "conn %p", conn);
c46b98be
JH		 2535
2536 if (skb->len < sizeof(*rp))
38e4a915 2537 return SMP_INVALID_PARAMS;
c46b98be 2538
9747a9f3
JH		 2539 /* Mark the information as received */
2540 smp->remote_key_dist &= ~SMP_DIST_ENC_KEY;
2541
b28b4943
JH		 2542 if (smp->remote_key_dist & SMP_DIST_ID_KEY)
2543 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
196332f5
JH		 2544 else if (smp->remote_key_dist & SMP_DIST_SIGN)
2545 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
b28b4943 2546
16b90839 2547 skb_pull(skb, sizeof(*rp));
7034b911 2548
ce39fb4e 2549 authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
2ceba539 2550 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
23d0e128
JH		 2551 authenticated, smp->tk, smp->enc_key_size,
2552 rp->ediv, rp->rand);
2553 smp->ltk = ltk;
c6e81e9a 2554 if (!(smp->remote_key_dist & KEY_DIST_MASK))
d6268e86 2555 smp_distribute_keys(smp);
7034b911
VCG		 2556
2557 return 0;
2558}
2559
fd349c02
JH		 2560static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
2561{
2562 struct smp_cmd_ident_info *info = (void *) skb->data;
5d88cc73
JH		 2563 struct l2cap_chan *chan = conn->smp;
2564 struct smp_chan *smp = chan->data;
fd349c02 2565
2e1614f7 2566 bt_dev_dbg(conn->hcon->hdev, "");
fd349c02
JH		 2567
2568 if (skb->len < sizeof(*info))
38e4a915 2569 return SMP_INVALID_PARAMS;
fd349c02 2570
600a8749
AM		 2571 /* Pairing is aborted if any blocked keys are distributed */
2572 if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_IRK,
2573 info->irk)) {
2574 bt_dev_warn_ratelimited(conn->hcon->hdev,
2575 "Identity key blocked for %pMR",
2576 &conn->hcon->dst);
2577 return SMP_INVALID_PARAMS;
2578 }
2579
b28b4943 2580 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO);
6131ddc8 2581
fd349c02
JH		 2582 skb_pull(skb, sizeof(*info));
2583
2584 memcpy(smp->irk, info->irk, 16);
2585
2586 return 0;
2587}
2588
2589static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
2590 struct sk_buff *skb)
2591{
2592 struct smp_cmd_ident_addr_info *info = (void *) skb->data;
5d88cc73
JH		 2593 struct l2cap_chan *chan = conn->smp;
2594 struct smp_chan *smp = chan->data;
fd349c02
JH		 2595 struct hci_conn *hcon = conn->hcon;
2596 bdaddr_t rpa;
2597
2e1614f7 2598 bt_dev_dbg(hcon->hdev, "");
fd349c02
JH		 2599
2600 if (skb->len < sizeof(*info))
38e4a915 2601 return SMP_INVALID_PARAMS;
fd349c02 2602
9747a9f3
JH		 2603 /* Mark the information as received */
2604 smp->remote_key_dist &= ~SMP_DIST_ID_KEY;
2605
b28b4943
JH		 2606 if (smp->remote_key_dist & SMP_DIST_SIGN)
2607 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
2608
fd349c02
JH		 2609 skb_pull(skb, sizeof(*info));
2610
a9a58f86
JH		 2611 /* Strictly speaking the Core Specification (4.1) allows sending
2612 * an empty address which would force us to rely on just the IRK
2613 * as "identity information". However, since such
2614 * implementations are not known of and in order to not over
2615 * complicate our implementation, simply pretend that we never
2616 * received an IRK for such a device.
e12af489
JH		 2617 *
2618 * The Identity Address must also be a Static Random or Public
2619 * Address, which hci_is_identity_address() checks for.
a9a58f86 2620 */
e12af489
JH		 2621 if (!bacmp(&info->bdaddr, BDADDR_ANY) ||
2622 !hci_is_identity_address(&info->bdaddr, info->addr_type)) {
2064ee33 2623 bt_dev_err(hcon->hdev, "ignoring IRK with no identity address");
31dd624e 2624 goto distribute;
a9a58f86
JH		 2625 }
2626
1d87b88b
SJ		 2627 /* Drop IRK if peer is using identity address during pairing but is
2628 * providing different address as identity information.
2629 *
2630 * Microsoft Surface Precision Mouse is known to have this bug.
2631 */
2632 if (hci_is_identity_address(&hcon->dst, hcon->dst_type) &&
2633 (bacmp(&info->bdaddr, &hcon->dst) ||
2634 info->addr_type != hcon->dst_type)) {
2635 bt_dev_err(hcon->hdev,
2636 "ignoring IRK with invalid identity address");
2637 goto distribute;
2638 }
2639
fd349c02
JH		 2640 bacpy(&smp->id_addr, &info->bdaddr);
2641 smp->id_addr_type = info->addr_type;
2642
2643 if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type))
2644 bacpy(&rpa, &hcon->dst);
2645 else
2646 bacpy(&rpa, BDADDR_ANY);
2647
23d0e128
JH		 2648 smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr,
2649 smp->id_addr_type, smp->irk, &rpa);
fd349c02 2650
31dd624e 2651distribute:
c6e81e9a
JH		 2652 if (!(smp->remote_key_dist & KEY_DIST_MASK))
2653 smp_distribute_keys(smp);
fd349c02
JH		 2654
2655 return 0;
2656}
2657
7ee4ea36
MH		 2658static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
2659{
2660 struct smp_cmd_sign_info *rp = (void *) skb->data;
5d88cc73
JH		 2661 struct l2cap_chan *chan = conn->smp;
2662 struct smp_chan *smp = chan->data;
7ee4ea36
MH		 2663 struct smp_csrk *csrk;
2664
2e1614f7 2665 bt_dev_dbg(conn->hcon->hdev, "conn %p", conn);
7ee4ea36
MH		 2666
2667 if (skb->len < sizeof(*rp))
38e4a915 2668 return SMP_INVALID_PARAMS;
7ee4ea36 2669
7ee4ea36
MH		 2670 /* Mark the information as received */
2671 smp->remote_key_dist &= ~SMP_DIST_SIGN;
2672
2673 skb_pull(skb, sizeof(*rp));
2674
7ee4ea36
MH		 2675 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
2676 if (csrk) {
4cd3928a
JH		 2677 if (conn->hcon->sec_level > BT_SECURITY_MEDIUM)
2678 csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED;
2679 else
2680 csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED;
7ee4ea36
MH		 2681 memcpy(csrk->val, rp->csrk, sizeof(csrk->val));
2682 }
2683 smp->csrk = csrk;
d6268e86 2684 smp_distribute_keys(smp);
7ee4ea36
MH		 2685
2686 return 0;
2687}
2688
5e3d3d9b
JH		 2689static u8 sc_select_method(struct smp_chan *smp)
2690{
2691 struct l2cap_conn *conn = smp->conn;
2692 struct hci_conn *hcon = conn->hcon;
2693 struct smp_cmd_pairing *local, *remote;
2694 u8 local_mitm, remote_mitm, local_io, remote_io, method;
2695
1a8bab4f
JH		 2696 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) ||
2697 test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags))
a29b0733
JH		 2698 return REQ_OOB;
2699
5e3d3d9b
JH		 2700 /* The preq/prsp contain the raw Pairing Request/Response PDUs
2701 * which are needed as inputs to some crypto functions. To get
2702 * the "struct smp_cmd_pairing" from them we need to skip the
2703 * first byte which contains the opcode.
2704 */
2705 if (hcon->out) {
2706 local = (void *) &smp->preq[1];
2707 remote = (void *) &smp->prsp[1];
2708 } else {
2709 local = (void *) &smp->prsp[1];
2710 remote = (void *) &smp->preq[1];
2711 }
2712
2713 local_io = local->io_capability;
2714 remote_io = remote->io_capability;
2715
2716 local_mitm = (local->auth_req & SMP_AUTH_MITM);
2717 remote_mitm = (remote->auth_req & SMP_AUTH_MITM);
2718
2719 /* If either side wants MITM, look up the method from the table,
2720 * otherwise use JUST WORKS.
2721 */
2722 if (local_mitm || remote_mitm)
2723 method = get_auth_method(smp, local_io, remote_io);
2724 else
2725 method = JUST_WORKS;
2726
2727 /* Don't confirm locally initiated pairing attempts */
2728 if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
2729 method = JUST_WORKS;
2730
2731 return method;
2732}
2733
d8f8edbe
JH		 2734static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
2735{
2736 struct smp_cmd_public_key *key = (void *) skb->data;
2737 struct hci_conn *hcon = conn->hcon;
2738 struct l2cap_chan *chan = conn->smp;
2739 struct smp_chan *smp = chan->data;
5e3d3d9b 2740 struct hci_dev *hdev = hcon->hdev;
c0153b0b 2741 struct crypto_kpp *tfm_ecdh;
cbbbe3e2 2742 struct smp_cmd_pairing_confirm cfm;
d8f8edbe
JH		 2743 int err;
2744
2e1614f7 2745 bt_dev_dbg(hdev, "conn %p", conn);
d8f8edbe
JH		 2746
2747 if (skb->len < sizeof(*key))
2748 return SMP_INVALID_PARAMS;
2749
6d19628f
LAD		 2750 /* Check if remote and local public keys are the same and debug key is
2751 * not in use.
2752 */
2753 if (!test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags) &&
2754 !crypto_memneq(key, smp->local_pk, 64)) {
2755 bt_dev_err(hdev, "Remote and local public keys are identical");
2756 return SMP_UNSPECIFIED;
2757 }
2758
d8f8edbe
JH		 2759 memcpy(smp->remote_pk, key, 64);
2760
a8ca617c
JH		 2761 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {
2762 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
2763 smp->rr, 0, cfm.confirm_val);
2764 if (err)
2765 return SMP_UNSPECIFIED;
2766
329d8230 2767 if (crypto_memneq(cfm.confirm_val, smp->pcnf, 16))
a8ca617c
JH		 2768 return SMP_CONFIRM_FAILED;
2769 }
2770
d8f8edbe
JH		 2771 /* Non-initiating device sends its public key after receiving
2772 * the key from the initiating device.
2773 */
2774 if (!hcon->out) {
2775 err = sc_send_public_key(smp);
2776 if (err)
2777 return err;
2778 }
2779
c7a3d57d 2780 SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk);
e091526d 2781 SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32);
d8f8edbe 2782
c0153b0b
TA		 2783 /* Compute the shared secret on the same crypto tfm on which the private
2784 * key was set/generated.
2785 */
2786 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
4ba5175f
MK		 2787 struct l2cap_chan *hchan = hdev->smp_data;
2788 struct smp_dev *smp_dev;
2789
2790 if (!hchan || !hchan->data)
2791 return SMP_UNSPECIFIED;
2792
2793 smp_dev = hchan->data;
c0153b0b
TA		 2794
2795 tfm_ecdh = smp_dev->tfm_ecdh;
2796 } else {
2797 tfm_ecdh = smp->tfm_ecdh;
2798 }
2799
2800 if (compute_ecdh_secret(tfm_ecdh, smp->remote_pk, smp->dhkey))
d8f8edbe
JH		 2801 return SMP_UNSPECIFIED;
2802
c7a3d57d 2803 SMP_DBG("DHKey %32phN", smp->dhkey);
d8f8edbe
JH		 2804
2805 set_bit(SMP_FLAG_REMOTE_PK, &smp->flags);
2806
5e3d3d9b
JH		 2807 smp->method = sc_select_method(smp);
2808
2e1614f7 2809 bt_dev_dbg(hdev, "selected method 0x%02x", smp->method);
5e3d3d9b
JH		 2810
2811 /* JUST_WORKS and JUST_CFM result in an unauthenticated key */
2812 if (smp->method == JUST_WORKS || smp->method == JUST_CFM)
2813 hcon->pending_sec_level = BT_SECURITY_MEDIUM;
2814 else
2815 hcon->pending_sec_level = BT_SECURITY_FIPS;
2816
329d8230 2817 if (!crypto_memneq(debug_pk, smp->remote_pk, 64))
aeb7d461
JH		 2818 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
2819
38606f14
JH		 2820 if (smp->method == DSP_PASSKEY) {
2821 get_random_bytes(&hcon->passkey_notify,
2822 sizeof(hcon->passkey_notify));
2823 hcon->passkey_notify %= 1000000;
2824 hcon->passkey_entered = 0;
2825 smp->passkey_round = 0;
2826 if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type,
2827 hcon->dst_type,
2828 hcon->passkey_notify,
2829 hcon->passkey_entered))
2830 return SMP_UNSPECIFIED;
2831 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2832 return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
2833 }
2834
94ea7257 2835 if (smp->method == REQ_OOB) {
a29b0733
JH		 2836 if (hcon->out)
2837 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2838 sizeof(smp->prnd), smp->prnd);
2839
2840 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2841
2842 return 0;
2843 }
2844
38606f14
JH		 2845 if (hcon->out)
2846 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2847
2848 if (smp->method == REQ_PASSKEY) {
2849 if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type,
2850 hcon->dst_type))
2851 return SMP_UNSPECIFIED;
2852 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2853 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2854 return 0;
2855 }
2856
cbbbe3e2
JH		 2857 /* The Initiating device waits for the non-initiating device to
2858 * send the confirm value.
2859 */
2860 if (conn->hcon->out)
2861 return 0;
2862
2863 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd,
2864 0, cfm.confirm_val);
2865 if (err)
2866 return SMP_UNSPECIFIED;
2867
2868 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
2869 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2870
d8f8edbe
JH		 2871 return 0;
2872}
2873
6433a9a2
JH		 2874static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb)
2875{
2876 struct smp_cmd_dhkey_check *check = (void *) skb->data;
2877 struct l2cap_chan *chan = conn->smp;
2878 struct hci_conn *hcon = conn->hcon;
2879 struct smp_chan *smp = chan->data;
2880 u8 a[7], b[7], *local_addr, *remote_addr;
2881 u8 io_cap[3], r[16], e[16];
2882 int err;
2883
2e1614f7 2884 bt_dev_dbg(hcon->hdev, "conn %p", conn);
6433a9a2
JH		 2885
2886 if (skb->len < sizeof(*check))
2887 return SMP_INVALID_PARAMS;
2888
2889 memcpy(a, &hcon->init_addr, 6);
2890 memcpy(b, &hcon->resp_addr, 6);
2891 a[6] = hcon->init_addr_type;
2892 b[6] = hcon->resp_addr_type;
2893
2894 if (hcon->out) {
2895 local_addr = a;
2896 remote_addr = b;
2897 memcpy(io_cap, &smp->prsp[1], 3);
2898 } else {
2899 local_addr = b;
2900 remote_addr = a;
2901 memcpy(io_cap, &smp->preq[1], 3);
2902 }
2903
2904 memset(r, 0, sizeof(r));
2905
38606f14
JH		 2906 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2907 put_unaligned_le32(hcon->passkey_notify, r);
882fafad
JH		 2908 else if (smp->method == REQ_OOB)
2909 memcpy(r, smp->lr, 16);
38606f14 2910
6433a9a2
JH		 2911 err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r,
2912 io_cap, remote_addr, local_addr, e);
2913 if (err)
2914 return SMP_UNSPECIFIED;
2915
329d8230 2916 if (crypto_memneq(check->e, e, 16))
6433a9a2
JH		 2917 return SMP_DHKEY_CHECK_FAILED;
2918
d3e54a87
JH		 2919 if (!hcon->out) {
2920 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
2921 set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags);
2922 return 0;
2923 }
d378a2d7 2924
fad646e1 2925 /* Responder sends DHKey check as response to initiator */
d3e54a87
JH		 2926 sc_dhkey_check(smp);
2927 }
d378a2d7 2928
d3e54a87 2929 sc_add_ltk(smp);
6433a9a2
JH		 2930
2931 if (hcon->out) {
8b76ce34 2932 hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size);
6433a9a2
JH		 2933 hcon->enc_key_size = smp->enc_key_size;
2934 }
2935
2936 return 0;
2937}
2938
1408bb6e
JH		 2939static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
2940 struct sk_buff *skb)
2941{
2942 struct smp_cmd_keypress_notify *kp = (void *) skb->data;
2943
2e1614f7 2944 bt_dev_dbg(conn->hcon->hdev, "value 0x%02x", kp->value);
1408bb6e
JH		 2945
2946 return 0;
2947}
2948
4befb867 2949static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
eb492e01 2950{
5d88cc73 2951 struct l2cap_conn *conn = chan->conn;
7b9899db 2952 struct hci_conn *hcon = conn->hcon;
b28b4943 2953 struct smp_chan *smp;
92381f5c 2954 __u8 code, reason;
eb492e01
AB		 2955 int err = 0;
2956
8ae9b984 2957 if (skb->len < 1)
92381f5c 2958 return -EILSEQ;
92381f5c 2959
d7a5a11d 2960 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) {
2e65c9d2
AG		 2961 reason = SMP_PAIRING_NOTSUPP;
2962 goto done;
2963 }
2964
92381f5c 2965 code = skb->data[0];
eb492e01
AB		 2966 skb_pull(skb, sizeof(code));
2967
b28b4943
JH		 2968 smp = chan->data;
2969
2970 if (code > SMP_CMD_MAX)
2971 goto drop;
2972
24bd0bd9 2973 if (smp && !test_and_clear_bit(code, &smp->allow_cmd))
b28b4943
JH		 2974 goto drop;
2975
2976 /* If we don't have a context the only allowed commands are
2977 * pairing request and security request.
8cf9fa12 2978 */
b28b4943
JH		 2979 if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ)
2980 goto drop;
8cf9fa12 2981
eb492e01
AB		 2982 switch (code) {
2983 case SMP_CMD_PAIRING_REQ:
da85e5e5 2984 reason = smp_cmd_pairing_req(conn, skb);
eb492e01
AB		 2985 break;
2986
2987 case SMP_CMD_PAIRING_FAIL:
84794e11 2988 smp_failure(conn, 0);
da85e5e5 2989 err = -EPERM;
eb492e01
AB		 2990 break;
2991
2992 case SMP_CMD_PAIRING_RSP:
da85e5e5 2993 reason = smp_cmd_pairing_rsp(conn, skb);
88ba43b6
AB		 2994 break;
2995
2996 case SMP_CMD_SECURITY_REQ:
da85e5e5 2997 reason = smp_cmd_security_req(conn, skb);
88ba43b6
AB		 2998 break;
2999
eb492e01 3000 case SMP_CMD_PAIRING_CONFIRM:
da85e5e5 3001 reason = smp_cmd_pairing_confirm(conn, skb);
88ba43b6
AB		 3002 break;
3003
eb492e01 3004 case SMP_CMD_PAIRING_RANDOM:
da85e5e5 3005 reason = smp_cmd_pairing_random(conn, skb);
88ba43b6
AB		 3006 break;
3007
eb492e01 3008 case SMP_CMD_ENCRYPT_INFO:
7034b911
VCG		 3009 reason = smp_cmd_encrypt_info(conn, skb);
3010 break;
3011
fad646e1
AP		 3012 case SMP_CMD_INITIATOR_IDENT:
3013 reason = smp_cmd_initiator_ident(conn, skb);
7034b911
VCG		 3014 break;
3015
eb492e01 3016 case SMP_CMD_IDENT_INFO:
fd349c02
JH		 3017 reason = smp_cmd_ident_info(conn, skb);
3018 break;
3019
eb492e01 3020 case SMP_CMD_IDENT_ADDR_INFO:
fd349c02
JH		 3021 reason = smp_cmd_ident_addr_info(conn, skb);
3022 break;
3023
eb492e01 3024 case SMP_CMD_SIGN_INFO:
7ee4ea36 3025 reason = smp_cmd_sign_info(conn, skb);
7034b911
VCG		 3026 break;
3027
d8f8edbe
JH		 3028 case SMP_CMD_PUBLIC_KEY:
3029 reason = smp_cmd_public_key(conn, skb);
3030 break;
3031
6433a9a2
JH		 3032 case SMP_CMD_DHKEY_CHECK:
3033 reason = smp_cmd_dhkey_check(conn, skb);
3034 break;
3035
1408bb6e
JH		 3036 case SMP_CMD_KEYPRESS_NOTIFY:
3037 reason = smp_cmd_keypress_notify(conn, skb);
3038 break;
3039
eb492e01 3040 default:
2e1614f7 3041 bt_dev_dbg(hcon->hdev, "Unknown command code 0x%2.2x", code);
eb492e01 3042 reason = SMP_CMD_NOTSUPP;
3a0259bb 3043 goto done;
eb492e01
AB		 3044 }
3045
3a0259bb 3046done:
9b7b18ef
JH		 3047 if (!err) {
3048 if (reason)
3049 smp_failure(conn, reason);
8ae9b984 3050 kfree_skb(skb);
9b7b18ef
JH		 3051 }
3052
eb492e01 3053 return err;
b28b4943
JH		 3054
3055drop:
2064ee33
MH		 3056 bt_dev_err(hcon->hdev, "unexpected SMP command 0x%02x from %pMR",
3057 code, &hcon->dst);
b28b4943
JH		 3058 kfree_skb(skb);
3059 return 0;
eb492e01 3060}
7034b911 3061
70db83c4
JH		 3062static void smp_teardown_cb(struct l2cap_chan *chan, int err)
3063{
3064 struct l2cap_conn *conn = chan->conn;
3065
2e1614f7 3066 bt_dev_dbg(conn->hcon->hdev, "chan %p", chan);
70db83c4 3067
fc75cc86 3068 if (chan->data)
5d88cc73 3069 smp_chan_destroy(conn);
5d88cc73 3070
70db83c4
JH		 3071 conn->smp = NULL;
3072 l2cap_chan_put(chan);
3073}
3074
b5ae344d
JH		 3075static void bredr_pairing(struct l2cap_chan *chan)
3076{
3077 struct l2cap_conn *conn = chan->conn;
3078 struct hci_conn *hcon = conn->hcon;
3079 struct hci_dev *hdev = hcon->hdev;
3080 struct smp_cmd_pairing req;
3081 struct smp_chan *smp;
3082
2e1614f7 3083 bt_dev_dbg(hdev, "chan %p", chan);
b5ae344d
JH		 3084
3085 /* Only new pairings are interesting */
3086 if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags))
3087 return;
3088
3089 /* Don't bother if we're not encrypted */
3090 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3091 return;
3092
74be523c 3093 /* Only initiator may initiate SMP over BR/EDR */
b5ae344d
JH		 3094 if (hcon->role != HCI_ROLE_MASTER)
3095 return;
3096
3097 /* Secure Connections support must be enabled */
d7a5a11d 3098 if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED))
b5ae344d
JH		 3099 return;
3100
3101 /* BR/EDR must use Secure Connections for SMP */
3102 if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) &&
b7cb93e5 3103 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 3104 return;
3105
3106 /* If our LE support is not enabled don't do anything */
d7a5a11d 3107 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
b5ae344d
JH		 3108 return;
3109
3110 /* Don't bother if remote LE support is not enabled */
3111 if (!lmp_host_le_capable(hcon))
3112 return;
3113
3114 /* Remote must support SMP fixed chan for BR/EDR */
3115 if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR))
3116 return;
3117
3118 /* Don't bother if SMP is already ongoing */
3119 if (chan->data)
3120 return;
3121
3122 smp = smp_chan_create(conn);
3123 if (!smp) {
2064ee33 3124 bt_dev_err(hdev, "unable to create SMP context for BR/EDR");
b5ae344d
JH		 3125 return;
3126 }
3127
3128 set_bit(SMP_FLAG_SC, &smp->flags);
3129
2e1614f7 3130 bt_dev_dbg(hdev, "starting SMP over BR/EDR");
b5ae344d
JH		 3131
3132 /* Prepare and send the BR/EDR SMP Pairing Request */
3133 build_bredr_pairing_cmd(smp, &req, NULL);
3134
3135 smp->preq[0] = SMP_CMD_PAIRING_REQ;
3136 memcpy(&smp->preq[1], &req, sizeof(req));
3137
3138 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req);
3139 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
3140}
3141
44f1a7ab
JH		 3142static void smp_resume_cb(struct l2cap_chan *chan)
3143{
b68fda68 3144 struct smp_chan *smp = chan->data;
44f1a7ab
JH		 3145 struct l2cap_conn *conn = chan->conn;
3146 struct hci_conn *hcon = conn->hcon;
3147
2e1614f7 3148 bt_dev_dbg(hcon->hdev, "chan %p", chan);
44f1a7ab 3149
b5ae344d
JH		 3150 if (hcon->type == ACL_LINK) {
3151 bredr_pairing(chan);
ef8efe4b 3152 return;
b5ae344d 3153 }
ef8efe4b 3154
86d1407c
JH		 3155 if (!smp)
3156 return;
b68fda68 3157
84bc0db5
JH		 3158 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3159 return;
3160
86d1407c
JH		 3161 cancel_delayed_work(&smp->security_timer);
3162
d6268e86 3163 smp_distribute_keys(smp);
44f1a7ab
JH		 3164}
3165
70db83c4
JH		 3166static void smp_ready_cb(struct l2cap_chan *chan)
3167{
3168 struct l2cap_conn *conn = chan->conn;
b5ae344d 3169 struct hci_conn *hcon = conn->hcon;
70db83c4 3170
2e1614f7 3171 bt_dev_dbg(hcon->hdev, "chan %p", chan);
70db83c4 3172
7883746b
JH		 3173 /* No need to call l2cap_chan_hold() here since we already own
3174 * the reference taken in smp_new_conn_cb(). This is just the
3175 * first time that we tie it to a specific pointer. The code in
3176 * l2cap_core.c ensures that there's no risk this function wont
3177 * get called if smp_new_conn_cb was previously called.
3178 */
70db83c4 3179 conn->smp = chan;
b5ae344d
JH		 3180
3181 if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3182 bredr_pairing(chan);
70db83c4
JH		 3183}
3184
4befb867
JH		 3185static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
3186{
3187 int err;
3188
2e1614f7 3189 bt_dev_dbg(chan->conn->hcon->hdev, "chan %p", chan);
4befb867
JH		 3190
3191 err = smp_sig_channel(chan, skb);
3192 if (err) {
b68fda68 3193 struct smp_chan *smp = chan->data;
4befb867 3194
b68fda68
JH		 3195 if (smp)
3196 cancel_delayed_work_sync(&smp->security_timer);
4befb867 3197
1e91c29e 3198 hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);
4befb867
JH		 3199 }
3200
3201 return err;
3202}
3203
70db83c4
JH		 3204static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan,
3205 unsigned long hdr_len,
3206 unsigned long len, int nb)
3207{
3208 struct sk_buff *skb;
3209
3210 skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
3211 if (!skb)
3212 return ERR_PTR(-ENOMEM);
3213
3214 skb->priority = HCI_PRIO_MAX;
a4368ff3 3215 bt_cb(skb)->l2cap.chan = chan;
70db83c4
JH		 3216
3217 return skb;
3218}
3219
3220static const struct l2cap_ops smp_chan_ops = {
3221 .name = "Security Manager",
3222 .ready = smp_ready_cb,
5d88cc73 3223 .recv = smp_recv_cb,
70db83c4
JH		 3224 .alloc_skb = smp_alloc_skb_cb,
3225 .teardown = smp_teardown_cb,
44f1a7ab 3226 .resume = smp_resume_cb,
70db83c4
JH		 3227
3228 .new_connection = l2cap_chan_no_new_connection,
70db83c4
JH		 3229 .state_change = l2cap_chan_no_state_change,
3230 .close = l2cap_chan_no_close,
3231 .defer = l2cap_chan_no_defer,
3232 .suspend = l2cap_chan_no_suspend,
70db83c4
JH		 3233 .set_shutdown = l2cap_chan_no_set_shutdown,
3234 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3235};
3236
3237static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan)
3238{
3239 struct l2cap_chan *chan;
3240
995fca15 3241 BT_DBG("pchan %p", pchan);
70db83c4
JH		 3242
3243 chan = l2cap_chan_create();
3244 if (!chan)
3245 return NULL;
3246
3247 chan->chan_type = pchan->chan_type;
3248 chan->ops = &smp_chan_ops;
3249 chan->scid = pchan->scid;
3250 chan->dcid = chan->scid;
3251 chan->imtu = pchan->imtu;
3252 chan->omtu = pchan->omtu;
3253 chan->mode = pchan->mode;
3254
abe84903
JH		 3255 /* Other L2CAP channels may request SMP routines in order to
3256 * change the security level. This means that the SMP channel
3257 * lock must be considered in its own category to avoid lockdep
3258 * warnings.
3259 */
3260 atomic_set(&chan->nesting, L2CAP_NESTING_SMP);
3261
995fca15 3262 BT_DBG("created chan %p", chan);
70db83c4
JH		 3263
3264 return chan;
3265}
3266
3267static const struct l2cap_ops smp_root_chan_ops = {
3268 .name = "Security Manager Root",
3269 .new_connection = smp_new_conn_cb,
3270
3271 /* None of these are implemented for the root channel */
3272 .close = l2cap_chan_no_close,
3273 .alloc_skb = l2cap_chan_no_alloc_skb,
3274 .recv = l2cap_chan_no_recv,
3275 .state_change = l2cap_chan_no_state_change,
3276 .teardown = l2cap_chan_no_teardown,
3277 .ready = l2cap_chan_no_ready,
3278 .defer = l2cap_chan_no_defer,
3279 .suspend = l2cap_chan_no_suspend,
3280 .resume = l2cap_chan_no_resume,
3281 .set_shutdown = l2cap_chan_no_set_shutdown,
3282 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3283};
3284
ef8efe4b 3285static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
711eafe3 3286{
70db83c4 3287 struct l2cap_chan *chan;
88a479d9 3288 struct smp_dev *smp;
71af2f6b 3289 struct crypto_shash *tfm_cmac;
47eb2ac8 3290 struct crypto_kpp *tfm_ecdh;
70db83c4 3291
ef8efe4b 3292 if (cid == L2CAP_CID_SMP_BREDR) {
88a479d9 3293 smp = NULL;
ef8efe4b
JH		 3294 goto create_chan;
3295 }
711eafe3 3296
88a479d9
MH		 3297 smp = kzalloc(sizeof(*smp), GFP_KERNEL);
3298 if (!smp)
3299 return ERR_PTR(-ENOMEM);
3300
71af2f6b 3301 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
6e2dc6d1 3302 if (IS_ERR(tfm_cmac)) {
2e1614f7 3303 bt_dev_err(hdev, "Unable to create CMAC crypto context");
453431a5 3304 kfree_sensitive(smp);
6e2dc6d1
MH		 3305 return ERR_CAST(tfm_cmac);
3306 }
3307
6763f5ea 3308 tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0);
47eb2ac8 3309 if (IS_ERR(tfm_ecdh)) {
2e1614f7 3310 bt_dev_err(hdev, "Unable to create ECDH crypto context");
47eb2ac8 3311 crypto_free_shash(tfm_cmac);
453431a5 3312 kfree_sensitive(smp);
47eb2ac8
TA		 3313 return ERR_CAST(tfm_ecdh);
3314 }
3315
94f14e47 3316 smp->local_oob = false;
6e2dc6d1 3317 smp->tfm_cmac = tfm_cmac;
47eb2ac8 3318 smp->tfm_ecdh = tfm_ecdh;
88a479d9 3319
ef8efe4b 3320create_chan:
70db83c4
JH		 3321 chan = l2cap_chan_create();
3322 if (!chan) {
63511f6d 3323 if (smp) {
71af2f6b 3324 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 3325 crypto_free_kpp(smp->tfm_ecdh);
453431a5 3326 kfree_sensitive(smp);
63511f6d 3327 }
ef8efe4b 3328 return ERR_PTR(-ENOMEM);
70db83c4
JH		 3329 }
3330
88a479d9 3331 chan->data = smp;
defce9e8 3332
ef8efe4b 3333 l2cap_add_scid(chan, cid);
70db83c4
JH		 3334
3335 l2cap_chan_set_defaults(chan);
3336
157029ba 3337 if (cid == L2CAP_CID_SMP) {
39e3e744
JH		 3338 u8 bdaddr_type;
3339
3340 hci_copy_identity_address(hdev, &chan->src, &bdaddr_type);
3341
3342 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
157029ba 3343 chan->src_type = BDADDR_LE_PUBLIC;
39e3e744
JH		 3344 else
3345 chan->src_type = BDADDR_LE_RANDOM;
157029ba
MH		 3346 } else {
3347 bacpy(&chan->src, &hdev->bdaddr);
ef8efe4b 3348 chan->src_type = BDADDR_BREDR;
157029ba
MH		 3349 }
3350
70db83c4
JH		 3351 chan->state = BT_LISTEN;
3352 chan->mode = L2CAP_MODE_BASIC;
3353 chan->imtu = L2CAP_DEFAULT_MTU;
3354 chan->ops = &smp_root_chan_ops;
3355
abe84903
JH		 3356 /* Set correct nesting level for a parent/listening channel */
3357 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
3358
ef8efe4b 3359 return chan;
711eafe3
JH		 3360}
3361
ef8efe4b 3362static void smp_del_chan(struct l2cap_chan *chan)
711eafe3 3363{
88a479d9 3364 struct smp_dev *smp;
70db83c4 3365
995fca15 3366 BT_DBG("chan %p", chan);
711eafe3 3367
88a479d9
MH		 3368 smp = chan->data;
3369 if (smp) {
defce9e8 3370 chan->data = NULL;
71af2f6b 3371 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 3372 crypto_free_kpp(smp->tfm_ecdh);
453431a5 3373 kfree_sensitive(smp);
711eafe3 3374 }
70db83c4 3375
70db83c4 3376 l2cap_chan_put(chan);
711eafe3 3377}
ef8efe4b 3378
82493316 3379int smp_force_bredr(struct hci_dev *hdev, bool enable)
300acfde 3380{
b7cb93e5 3381 if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
300acfde
MH		 3382 return -EALREADY;
3383
3384 if (enable) {
3385 struct l2cap_chan *chan;
3386
3387 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3388 if (IS_ERR(chan))
3389 return PTR_ERR(chan);
3390
3391 hdev->smp_bredr_data = chan;
3392 } else {
3393 struct l2cap_chan *chan;
3394
3395 chan = hdev->smp_bredr_data;
3396 hdev->smp_bredr_data = NULL;
3397 smp_del_chan(chan);
3398 }
3399
b7cb93e5 3400 hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
300acfde 3401
82493316 3402 return 0;
300acfde
MH		 3403}
3404
ef8efe4b
JH		 3405int smp_register(struct hci_dev *hdev)
3406{
3407 struct l2cap_chan *chan;
3408
2e1614f7 3409 bt_dev_dbg(hdev, "");
ef8efe4b 3410
7e7ec445
MH		 3411 /* If the controller does not support Low Energy operation, then
3412 * there is also no need to register any SMP channel.
3413 */
3414 if (!lmp_le_capable(hdev))
3415 return 0;
3416
2b8df323
MH		 3417 if (WARN_ON(hdev->smp_data)) {
3418 chan = hdev->smp_data;
3419 hdev->smp_data = NULL;
3420 smp_del_chan(chan);
3421 }
3422
ef8efe4b
JH		 3423 chan = smp_add_cid(hdev, L2CAP_CID_SMP);
3424 if (IS_ERR(chan))
3425 return PTR_ERR(chan);
3426
3427 hdev->smp_data = chan;
3428
300acfde 3429 if (!lmp_sc_capable(hdev)) {
83ebb9ec
SJ		 3430 /* Flag can be already set here (due to power toggle) */
3431 if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
3432 return 0;
300acfde 3433 }
ef8efe4b 3434
2b8df323
MH		 3435 if (WARN_ON(hdev->smp_bredr_data)) {
3436 chan = hdev->smp_bredr_data;
3437 hdev->smp_bredr_data = NULL;
3438 smp_del_chan(chan);
3439 }
3440
ef8efe4b
JH		 3441 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3442 if (IS_ERR(chan)) {
3443 int err = PTR_ERR(chan);
3444 chan = hdev->smp_data;
3445 hdev->smp_data = NULL;
3446 smp_del_chan(chan);
3447 return err;
3448 }
3449
3450 hdev->smp_bredr_data = chan;
3451
3452 return 0;
3453}
3454
3455void smp_unregister(struct hci_dev *hdev)
3456{
3457 struct l2cap_chan *chan;
3458
3459 if (hdev->smp_bredr_data) {
3460 chan = hdev->smp_bredr_data;
3461 hdev->smp_bredr_data = NULL;
3462 smp_del_chan(chan);
3463 }
3464
3465 if (hdev->smp_data) {
3466 chan = hdev->smp_data;
3467 hdev->smp_data = NULL;
3468 smp_del_chan(chan);
3469 }
3470}
0a2b0f04
JH		 3471
3472#if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
3473
47eb2ac8 3474static int __init test_debug_key(struct crypto_kpp *tfm_ecdh)
71653eb6 3475{
c0153b0b 3476 u8 pk[64];
a2976416 3477 int err;
71653eb6 3478
c0153b0b 3479 err = set_ecdh_privkey(tfm_ecdh, debug_sk);
a2976416
TA		 3480 if (err)
3481 return err;
71653eb6 3482
c0153b0b
TA		 3483 err = generate_ecdh_public_key(tfm_ecdh, pk);
3484 if (err)
3485 return err;
71653eb6 3486
329d8230 3487 if (crypto_memneq(pk, debug_pk, 64))
71653eb6
MH		 3488 return -EINVAL;
3489
3490 return 0;
3491}
3492
28a220aa 3493static int __init test_ah(void)
cfc4198e
JH		 3494{
3495 const u8 irk[16] = {
3496 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3497 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3498 const u8 r[3] = { 0x94, 0x81, 0x70 };
3499 const u8 exp[3] = { 0xaa, 0xfb, 0x0d };
3500 u8 res[3];
3501 int err;
3502
28a220aa 3503 err = smp_ah(irk, r, res);
cfc4198e
JH		 3504 if (err)
3505 return err;
3506
329d8230 3507 if (crypto_memneq(res, exp, 3))
cfc4198e
JH		 3508 return -EINVAL;
3509
3510 return 0;
3511}
3512
28a220aa 3513static int __init test_c1(void)
cfc4198e
JH		 3514{
3515 const u8 k[16] = {
3516 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3517 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3518 const u8 r[16] = {
3519 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63,
3520 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 };
3521 const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 };
3522 const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 };
3523 const u8 _iat = 0x01;
3524 const u8 _rat = 0x00;
3525 const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } };
3526 const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } };
3527 const u8 exp[16] = {
3528 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2,
3529 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e };
3530 u8 res[16];
3531 int err;
3532
28a220aa 3533 err = smp_c1(k, r, preq, pres, _iat, &ia, _rat, &ra, res);
cfc4198e
JH		 3534 if (err)
3535 return err;
3536
329d8230 3537 if (crypto_memneq(res, exp, 16))
cfc4198e
JH		 3538 return -EINVAL;
3539
3540 return 0;
3541}
3542
28a220aa 3543static int __init test_s1(void)
cfc4198e
JH		 3544{
3545 const u8 k[16] = {
3546 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3547 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3548 const u8 r1[16] = {
3549 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 };
3550 const u8 r2[16] = {
3551 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 };
3552 const u8 exp[16] = {
3553 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b,
3554 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a };
3555 u8 res[16];
3556 int err;
3557
28a220aa 3558 err = smp_s1(k, r1, r2, res);
cfc4198e
JH		 3559 if (err)
3560 return err;
3561
329d8230 3562 if (crypto_memneq(res, exp, 16))
cfc4198e
JH		 3563 return -EINVAL;
3564
3565 return 0;
3566}
3567
71af2f6b 3568static int __init test_f4(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3569{
3570 const u8 u[32] = {
3571 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3572 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3573 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3574 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3575 const u8 v[32] = {
3576 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3577 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3578 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3579 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3580 const u8 x[16] = {
3581 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3582 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3583 const u8 z = 0x00;
3584 const u8 exp[16] = {
3585 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1,
3586 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 };
3587 u8 res[16];
3588 int err;
3589
3590 err = smp_f4(tfm_cmac, u, v, x, z, res);
3591 if (err)
3592 return err;
3593
329d8230 3594 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3595 return -EINVAL;
3596
3597 return 0;
3598}
3599
71af2f6b 3600static int __init test_f5(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3601{
3602 const u8 w[32] = {
3603 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86,
3604 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99,
3605 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3606 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3607 const u8 n1[16] = {
3608 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3609 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3610 const u8 n2[16] = {
3611 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3612 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3613 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3614 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3615 const u8 exp_ltk[16] = {
3616 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98,
3617 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 };
3618 const u8 exp_mackey[16] = {
3619 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3620 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3621 u8 mackey[16], ltk[16];
3622 int err;
3623
3624 err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk);
3625 if (err)
3626 return err;
3627
329d8230 3628 if (crypto_memneq(mackey, exp_mackey, 16))
fb2969a3
JH		 3629 return -EINVAL;
3630
329d8230 3631 if (crypto_memneq(ltk, exp_ltk, 16))
fb2969a3
JH		 3632 return -EINVAL;
3633
3634 return 0;
3635}
3636
71af2f6b 3637static int __init test_f6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3638{
3639 const u8 w[16] = {
3640 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3641 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3642 const u8 n1[16] = {
3643 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3644 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3645 const u8 n2[16] = {
3646 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3647 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3648 const u8 r[16] = {
3649 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08,
3650 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 };
3651 const u8 io_cap[3] = { 0x02, 0x01, 0x01 };
3652 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3653 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3654 const u8 exp[16] = {
3655 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2,
3656 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 };
3657 u8 res[16];
3658 int err;
3659
3660 err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res);
3661 if (err)
3662 return err;
3663
329d8230 3664 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3665 return -EINVAL;
3666
3667 return 0;
3668}
3669
71af2f6b 3670static int __init test_g2(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3671{
3672 const u8 u[32] = {
3673 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3674 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3675 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3676 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3677 const u8 v[32] = {
3678 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3679 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3680 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3681 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3682 const u8 x[16] = {
3683 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3684 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3685 const u8 y[16] = {
3686 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3687 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3688 const u32 exp_val = 0x2f9ed5ba % 1000000;
3689 u32 val;
3690 int err;
3691
3692 err = smp_g2(tfm_cmac, u, v, x, y, &val);
3693 if (err)
3694 return err;
3695
3696 if (val != exp_val)
3697 return -EINVAL;
3698
3699 return 0;
3700}
3701
71af2f6b 3702static int __init test_h6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3703{
3704 const u8 w[16] = {
3705 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3706 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3707 const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c };
3708 const u8 exp[16] = {
3709 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8,
3710 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d };
3711 u8 res[16];
3712 int err;
3713
3714 err = smp_h6(tfm_cmac, w, key_id, res);
3715 if (err)
3716 return err;
3717
329d8230 3718 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3719 return -EINVAL;
3720
3721 return 0;
3722}
3723
64dd374e
MH		 3724static char test_smp_buffer[32];
3725
3726static ssize_t test_smp_read(struct file *file, char __user *user_buf,
3727 size_t count, loff_t *ppos)
3728{
3729 return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer,
3730 strlen(test_smp_buffer));
3731}
3732
3733static const struct file_operations test_smp_fops = {
3734 .open = simple_open,
3735 .read = test_smp_read,
3736 .llseek = default_llseek,
3737};
3738
28a220aa 3739static int __init run_selftests(struct crypto_shash *tfm_cmac,
47eb2ac8 3740 struct crypto_kpp *tfm_ecdh)
0a2b0f04 3741{
255047b0
MH		 3742 ktime_t calltime, delta, rettime;
3743 unsigned long long duration;
cfc4198e
JH		 3744 int err;
3745
255047b0
MH		 3746 calltime = ktime_get();
3747
47eb2ac8 3748 err = test_debug_key(tfm_ecdh);
71653eb6
MH		 3749 if (err) {
3750 BT_ERR("debug_key test failed");
3751 goto done;
3752 }
3753
28a220aa 3754 err = test_ah();
cfc4198e
JH		 3755 if (err) {
3756 BT_ERR("smp_ah test failed");
64dd374e 3757 goto done;
cfc4198e
JH		 3758 }
3759
28a220aa 3760 err = test_c1();
cfc4198e
JH		 3761 if (err) {
3762 BT_ERR("smp_c1 test failed");
64dd374e 3763 goto done;
cfc4198e
JH		 3764 }
3765
28a220aa 3766 err = test_s1();
cfc4198e
JH		 3767 if (err) {
3768 BT_ERR("smp_s1 test failed");
64dd374e 3769 goto done;
cfc4198e
JH		 3770 }
3771
fb2969a3
JH		 3772 err = test_f4(tfm_cmac);
3773 if (err) {
3774 BT_ERR("smp_f4 test failed");
64dd374e 3775 goto done;
fb2969a3
JH		 3776 }
3777
3778 err = test_f5(tfm_cmac);
3779 if (err) {
3780 BT_ERR("smp_f5 test failed");
64dd374e 3781 goto done;
fb2969a3
JH		 3782 }
3783
3784 err = test_f6(tfm_cmac);
3785 if (err) {
3786 BT_ERR("smp_f6 test failed");
64dd374e 3787 goto done;
fb2969a3
JH		 3788 }
3789
3790 err = test_g2(tfm_cmac);
3791 if (err) {
3792 BT_ERR("smp_g2 test failed");
64dd374e 3793 goto done;
fb2969a3
JH		 3794 }
3795
3796 err = test_h6(tfm_cmac);
3797 if (err) {
3798 BT_ERR("smp_h6 test failed");
64dd374e 3799 goto done;
fb2969a3
JH		 3800 }
3801
255047b0
MH		 3802 rettime = ktime_get();
3803 delta = ktime_sub(rettime, calltime);
3804 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
3805
5ced2464 3806 BT_INFO("SMP test passed in %llu usecs", duration);
0a2b0f04 3807
64dd374e
MH		 3808done:
3809 if (!err)
3810 snprintf(test_smp_buffer, sizeof(test_smp_buffer),
3811 "PASS (%llu usecs)\n", duration);
3812 else
3813 snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n");
3814
3815 debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL,
3816 &test_smp_fops);
3817
3818 return err;
0a2b0f04
JH		 3819}
3820
3821int __init bt_selftest_smp(void)
3822{
71af2f6b 3823 struct crypto_shash *tfm_cmac;
47eb2ac8 3824 struct crypto_kpp *tfm_ecdh;
0a2b0f04
JH		 3825 int err;
3826
3d234b33 3827 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
0a2b0f04
JH		 3828 if (IS_ERR(tfm_cmac)) {
3829 BT_ERR("Unable to create CMAC crypto context");
0a2b0f04
JH		 3830 return PTR_ERR(tfm_cmac);
3831 }
3832
6763f5ea 3833 tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0);
47eb2ac8
TA		 3834 if (IS_ERR(tfm_ecdh)) {
3835 BT_ERR("Unable to create ECDH crypto context");
3836 crypto_free_shash(tfm_cmac);
47eb2ac8
TA		 3837 return PTR_ERR(tfm_ecdh);
3838 }
3839
28a220aa 3840 err = run_selftests(tfm_cmac, tfm_ecdh);
0a2b0f04 3841
71af2f6b 3842 crypto_free_shash(tfm_cmac);
47eb2ac8 3843 crypto_free_kpp(tfm_ecdh);
0a2b0f04
JH		 3844
3845 return err;
3846}
3847
3848#endif
Linux 6.x block layer and io_uring tree(s)