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[mirror_ubuntu-bionic-kernel.git] / net / bluetooth / smp.c
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eb492e01
AB		 1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License version 2 as
7 published by the Free Software Foundation;
8
9 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
10 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
11 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
12 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
13 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
18 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
19 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
20 SOFTWARE IS DISCLAIMED.
21*/
22
300acfde 23#include <linux/debugfs.h>
8c520a59 24#include <linux/scatterlist.h>
a4770e11 25#include <linux/crypto.h>
329d8230 26#include <crypto/algapi.h>
8c520a59 27#include <crypto/b128ops.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
JH		 42/* Low-level debug macros to be used for stuff that we don't want
43 * accidentially in dmesg, i.e. the values of the various crypto keys
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
JH		 56/* Keys which are not distributed with Secure Connections */
57#define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY);
58
17b02e62 59#define SMP_TIMEOUT msecs_to_jiffies(30000)
5d3de7df 60
d7a5a11d 61#define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \
a62da6f1 62 0x3f : 0x07)
0edb14de 63#define KEY_DIST_MASK 0x07
065a13e2 64
cbbbe3e2
JH		 65/* Maximum message length that can be passed to aes_cmac */
66#define CMAC_MSG_MAX 80
67
533e35d4
JH		 68enum {
69 SMP_FLAG_TK_VALID,
70 SMP_FLAG_CFM_PENDING,
71 SMP_FLAG_MITM_AUTH,
72 SMP_FLAG_COMPLETE,
73 SMP_FLAG_INITIATOR,
65668776 74 SMP_FLAG_SC,
d8f8edbe 75 SMP_FLAG_REMOTE_PK,
aeb7d461 76 SMP_FLAG_DEBUG_KEY,
38606f14 77 SMP_FLAG_WAIT_USER,
d3e54a87 78 SMP_FLAG_DHKEY_PENDING,
1a8bab4f
JH		 79 SMP_FLAG_REMOTE_OOB,
80 SMP_FLAG_LOCAL_OOB,
a62da6f1 81 SMP_FLAG_CT2,
533e35d4 82};
4bc58f51 83
88a479d9 84struct smp_dev {
60a27d65
MH		 85 /* Secure Connections OOB data */
86 u8 local_pk[64];
fb334fee 87 u8 local_rand[16];
60a27d65
MH		 88 bool debug_key;
89
b1f663c9 90 u8 min_key_size;
2fd36558
JH		 91 u8 max_key_size;
92
a4770e11 93 struct crypto_cipher *tfm_aes;
71af2f6b 94 struct crypto_shash *tfm_cmac;
47eb2ac8 95 struct crypto_kpp *tfm_ecdh;
88a479d9
MH		 96};
97
4bc58f51 98struct smp_chan {
b68fda68
JH		 99 struct l2cap_conn *conn;
100 struct delayed_work security_timer;
b28b4943 101 unsigned long allow_cmd; /* Bitmask of allowed commands */
b68fda68 102
4bc58f51
JH		 103 u8 preq[7]; /* SMP Pairing Request */
104 u8 prsp[7]; /* SMP Pairing Response */
105 u8 prnd[16]; /* SMP Pairing Random (local) */
106 u8 rrnd[16]; /* SMP Pairing Random (remote) */
107 u8 pcnf[16]; /* SMP Pairing Confirm */
108 u8 tk[16]; /* SMP Temporary Key */
882fafad
JH		 109 u8 rr[16]; /* Remote OOB ra/rb value */
110 u8 lr[16]; /* Local OOB ra/rb value */
4bc58f51
JH		 111 u8 enc_key_size;
112 u8 remote_key_dist;
113 bdaddr_t id_addr;
114 u8 id_addr_type;
115 u8 irk[16];
116 struct smp_csrk *csrk;
117 struct smp_csrk *slave_csrk;
118 struct smp_ltk *ltk;
119 struct smp_ltk *slave_ltk;
120 struct smp_irk *remote_irk;
6a77083a 121 u8 *link_key;
4a74d658 122 unsigned long flags;
783e0574 123 u8 method;
38606f14 124 u8 passkey_round;
6a7bd103 125
3b19146d
JH		 126 /* Secure Connections variables */
127 u8 local_pk[64];
d8f8edbe
JH		 128 u8 remote_pk[64];
129 u8 dhkey[32];
760b018b 130 u8 mackey[16];
3b19146d 131
a4770e11 132 struct crypto_cipher *tfm_aes;
71af2f6b 133 struct crypto_shash *tfm_cmac;
47eb2ac8 134 struct crypto_kpp *tfm_ecdh;
4bc58f51
JH		 135};
136
aeb7d461
JH		 137/* These debug key values are defined in the SMP section of the core
138 * specification. debug_pk is the public debug key and debug_sk the
139 * private debug key.
140 */
141static const u8 debug_pk[64] = {
142 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
143 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
144 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
145 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20,
146
147 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74,
148 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76,
149 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63,
150 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc,
151};
152
153static const u8 debug_sk[32] = {
154 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58,
155 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a,
156 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74,
157 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f,
158};
159
8a2936f4 160static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
d22ef0bc 161{
8a2936f4 162 size_t i;
d22ef0bc 163
8a2936f4
JH		 164 for (i = 0; i < len; i++)
165 dst[len - 1 - i] = src[i];
d22ef0bc
AB		 166}
167
06edf8de
JH		 168/* The following functions map to the LE SC SMP crypto functions
169 * AES-CMAC, f4, f5, f6, g2 and h6.
170 */
171
71af2f6b 172static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m,
cbbbe3e2
JH		 173 size_t len, u8 mac[16])
174{
175 uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
71af2f6b 176 SHASH_DESC_ON_STACK(desc, tfm);
cbbbe3e2
JH		 177 int err;
178
179 if (len > CMAC_MSG_MAX)
180 return -EFBIG;
181
182 if (!tfm) {
183 BT_ERR("tfm %p", tfm);
184 return -EINVAL;
185 }
186
71af2f6b
HX		 187 desc->tfm = tfm;
188 desc->flags = 0;
cbbbe3e2
JH		 189
190 /* Swap key and message from LSB to MSB */
191 swap_buf(k, tmp, 16);
192 swap_buf(m, msg_msb, len);
193
c7a3d57d
JH		 194 SMP_DBG("msg (len %zu) %*phN", len, (int) len, m);
195 SMP_DBG("key %16phN", k);
cbbbe3e2 196
71af2f6b 197 err = crypto_shash_setkey(tfm, tmp, 16);
cbbbe3e2
JH		 198 if (err) {
199 BT_ERR("cipher setkey failed: %d", err);
200 return err;
201 }
202
71af2f6b
HX		 203 err = crypto_shash_digest(desc, msg_msb, len, mac_msb);
204 shash_desc_zero(desc);
cbbbe3e2 205 if (err) {
71af2f6b 206 BT_ERR("Hash computation error %d", err);
cbbbe3e2
JH		 207 return err;
208 }
209
210 swap_buf(mac_msb, mac, 16);
211
c7a3d57d 212 SMP_DBG("mac %16phN", mac);
cbbbe3e2
JH		 213
214 return 0;
215}
216
71af2f6b
HX		 217static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32],
218 const u8 v[32], const u8 x[16], u8 z, u8 res[16])
cbbbe3e2
JH		 219{
220 u8 m[65];
221 int err;
222
c7a3d57d
JH		 223 SMP_DBG("u %32phN", u);
224 SMP_DBG("v %32phN", v);
225 SMP_DBG("x %16phN z %02x", x, z);
cbbbe3e2
JH		 226
227 m[0] = z;
228 memcpy(m + 1, v, 32);
229 memcpy(m + 33, u, 32);
230
231 err = aes_cmac(tfm_cmac, x, m, sizeof(m), res);
232 if (err)
233 return err;
234
c7a3d57d 235 SMP_DBG("res %16phN", res);
cbbbe3e2
JH		 236
237 return err;
238}
239
71af2f6b 240static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32],
4da50de8
JH		 241 const u8 n1[16], const u8 n2[16], const u8 a1[7],
242 const u8 a2[7], u8 mackey[16], u8 ltk[16])
760b018b
JH		 243{
244 /* The btle, salt and length "magic" values are as defined in
245 * the SMP section of the Bluetooth core specification. In ASCII
246 * the btle value ends up being 'btle'. The salt is just a
247 * random number whereas length is the value 256 in little
248 * endian format.
249 */
250 const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 };
251 const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60,
252 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c };
253 const u8 length[2] = { 0x00, 0x01 };
254 u8 m[53], t[16];
255 int err;
256
c7a3d57d
JH		 257 SMP_DBG("w %32phN", w);
258 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
259 SMP_DBG("a1 %7phN a2 %7phN", a1, a2);
760b018b
JH		 260
261 err = aes_cmac(tfm_cmac, salt, w, 32, t);
262 if (err)
263 return err;
264
c7a3d57d 265 SMP_DBG("t %16phN", t);
760b018b
JH		 266
267 memcpy(m, length, 2);
268 memcpy(m + 2, a2, 7);
269 memcpy(m + 9, a1, 7);
270 memcpy(m + 16, n2, 16);
271 memcpy(m + 32, n1, 16);
272 memcpy(m + 48, btle, 4);
273
274 m[52] = 0; /* Counter */
275
276 err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey);
277 if (err)
278 return err;
279
c7a3d57d 280 SMP_DBG("mackey %16phN", mackey);
760b018b
JH		 281
282 m[52] = 1; /* Counter */
283
284 err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk);
285 if (err)
286 return err;
287
c7a3d57d 288 SMP_DBG("ltk %16phN", ltk);
760b018b
JH		 289
290 return 0;
291}
292
71af2f6b 293static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16],
4da50de8 294 const u8 n1[16], const u8 n2[16], const u8 r[16],
760b018b
JH		 295 const u8 io_cap[3], const u8 a1[7], const u8 a2[7],
296 u8 res[16])
297{
298 u8 m[65];
299 int err;
300
c7a3d57d
JH		 301 SMP_DBG("w %16phN", w);
302 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
303 SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2);
760b018b
JH		 304
305 memcpy(m, a2, 7);
306 memcpy(m + 7, a1, 7);
307 memcpy(m + 14, io_cap, 3);
308 memcpy(m + 17, r, 16);
309 memcpy(m + 33, n2, 16);
310 memcpy(m + 49, n1, 16);
311
312 err = aes_cmac(tfm_cmac, w, m, sizeof(m), res);
313 if (err)
314 return err;
315
203de21b 316 SMP_DBG("res %16phN", res);
760b018b
JH		 317
318 return err;
319}
320
71af2f6b 321static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32],
191dc7fe
JH		 322 const u8 x[16], const u8 y[16], u32 *val)
323{
324 u8 m[80], tmp[16];
325 int err;
326
c7a3d57d
JH		 327 SMP_DBG("u %32phN", u);
328 SMP_DBG("v %32phN", v);
329 SMP_DBG("x %16phN y %16phN", x, y);
191dc7fe
JH		 330
331 memcpy(m, y, 16);
332 memcpy(m + 16, v, 32);
333 memcpy(m + 48, u, 32);
334
335 err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
336 if (err)
337 return err;
338
339 *val = get_unaligned_le32(tmp);
340 *val %= 1000000;
341
c7a3d57d 342 SMP_DBG("val %06u", *val);
191dc7fe
JH		 343
344 return 0;
345}
346
71af2f6b 347static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16],
06edf8de
JH		 348 const u8 key_id[4], u8 res[16])
349{
350 int err;
351
352 SMP_DBG("w %16phN key_id %4phN", w, key_id);
353
354 err = aes_cmac(tfm_cmac, w, key_id, 4, res);
355 if (err)
356 return err;
357
358 SMP_DBG("res %16phN", res);
359
360 return err;
361}
362
a62da6f1
JH		 363static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16],
364 const u8 salt[16], u8 res[16])
365{
366 int err;
367
368 SMP_DBG("w %16phN salt %16phN", w, salt);
369
370 err = aes_cmac(tfm_cmac, salt, w, 16, res);
371 if (err)
372 return err;
373
374 SMP_DBG("res %16phN", res);
375
376 return err;
377}
378
06edf8de
JH		 379/* The following functions map to the legacy SMP crypto functions e, c1,
380 * s1 and ah.
381 */
382
a4770e11 383static int smp_e(struct crypto_cipher *tfm, const u8 *k, u8 *r)
d22ef0bc 384{
943a732a 385 uint8_t tmp[16], data[16];
201a5929 386 int err;
d22ef0bc 387
011c391a
JH		 388 SMP_DBG("k %16phN r %16phN", k, r);
389
7f376cd6 390 if (!tfm) {
d22ef0bc
AB		 391 BT_ERR("tfm %p", tfm);
392 return -EINVAL;
393 }
394
943a732a 395 /* The most significant octet of key corresponds to k[0] */
8a2936f4 396 swap_buf(k, tmp, 16);
943a732a 397
a4770e11 398 err = crypto_cipher_setkey(tfm, tmp, 16);
d22ef0bc
AB		 399 if (err) {
400 BT_ERR("cipher setkey failed: %d", err);
401 return err;
402 }
403
943a732a 404 /* Most significant octet of plaintextData corresponds to data[0] */
8a2936f4 405 swap_buf(r, data, 16);
943a732a 406
a4770e11 407 crypto_cipher_encrypt_one(tfm, data, data);
d22ef0bc 408
943a732a 409 /* Most significant octet of encryptedData corresponds to data[0] */
8a2936f4 410 swap_buf(data, r, 16);
943a732a 411
011c391a
JH		 412 SMP_DBG("r %16phN", r);
413
d22ef0bc
AB		 414 return err;
415}
416
a4770e11 417static int smp_c1(struct crypto_cipher *tfm_aes, const u8 k[16],
06edf8de
JH		 418 const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
419 const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
6a77083a 420{
06edf8de 421 u8 p1[16], p2[16];
6a77083a
JH		 422 int err;
423
011c391a
JH		 424 SMP_DBG("k %16phN r %16phN", k, r);
425 SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra);
426 SMP_DBG("preq %7phN pres %7phN", preq, pres);
427
06edf8de 428 memset(p1, 0, 16);
6a77083a 429
06edf8de
JH		 430 /* p1 = pres || preq || _rat || _iat */
431 p1[0] = _iat;
432 p1[1] = _rat;
433 memcpy(p1 + 2, preq, 7);
434 memcpy(p1 + 9, pres, 7);
435
011c391a 436 SMP_DBG("p1 %16phN", p1);
06edf8de
JH		 437
438 /* res = r XOR p1 */
439 u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
440
441 /* res = e(k, res) */
442 err = smp_e(tfm_aes, k, res);
443 if (err) {
444 BT_ERR("Encrypt data error");
6a77083a 445 return err;
06edf8de 446 }
6a77083a 447
011c391a
JH		 448 /* p2 = padding || ia || ra */
449 memcpy(p2, ra, 6);
450 memcpy(p2 + 6, ia, 6);
451 memset(p2 + 12, 0, 4);
452
453 SMP_DBG("p2 %16phN", p2);
454
06edf8de
JH		 455 /* res = res XOR p2 */
456 u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
457
458 /* res = e(k, res) */
459 err = smp_e(tfm_aes, k, res);
460 if (err)
461 BT_ERR("Encrypt data error");
462
463 return err;
464}
465
a4770e11 466static int smp_s1(struct crypto_cipher *tfm_aes, const u8 k[16],
06edf8de
JH		 467 const u8 r1[16], const u8 r2[16], u8 _r[16])
468{
469 int err;
470
471 /* Just least significant octets from r1 and r2 are considered */
472 memcpy(_r, r2, 8);
473 memcpy(_r + 8, r1, 8);
474
475 err = smp_e(tfm_aes, k, _r);
476 if (err)
477 BT_ERR("Encrypt data error");
6a77083a
JH		 478
479 return err;
480}
481
a4770e11 482static int smp_ah(struct crypto_cipher *tfm, const u8 irk[16],
cd082797 483 const u8 r[3], u8 res[3])
60478054 484{
943a732a 485 u8 _res[16];
60478054
JH		 486 int err;
487
488 /* r' = padding || r */
943a732a
JH		 489 memcpy(_res, r, 3);
490 memset(_res + 3, 0, 13);
60478054 491
943a732a 492 err = smp_e(tfm, irk, _res);
60478054
JH		 493 if (err) {
494 BT_ERR("Encrypt error");
495 return err;
496 }
497
498 /* The output of the random address function ah is:
c5080d42 499 * ah(k, r) = e(k, r') mod 2^24
60478054
JH		 500 * The output of the security function e is then truncated to 24 bits
501 * by taking the least significant 24 bits of the output of e as the
502 * result of ah.
503 */
943a732a 504 memcpy(res, _res, 3);
60478054
JH		 505
506 return 0;
507}
508
cd082797
JH		 509bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
510 const bdaddr_t *bdaddr)
60478054 511{
defce9e8 512 struct l2cap_chan *chan = hdev->smp_data;
88a479d9 513 struct smp_dev *smp;
60478054
JH		 514 u8 hash[3];
515 int err;
516
defce9e8
JH		 517 if (!chan || !chan->data)
518 return false;
519
88a479d9 520 smp = chan->data;
defce9e8 521
60478054
JH		 522 BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk);
523
88a479d9 524 err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash);
60478054
JH		 525 if (err)
526 return false;
527
329d8230 528 return !crypto_memneq(bdaddr->b, hash, 3);
60478054
JH		 529}
530
cd082797 531int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
b1e2b3ae 532{
defce9e8 533 struct l2cap_chan *chan = hdev->smp_data;
88a479d9 534 struct smp_dev *smp;
b1e2b3ae
JH		 535 int err;
536
defce9e8
JH		 537 if (!chan || !chan->data)
538 return -EOPNOTSUPP;
539
88a479d9 540 smp = chan->data;
defce9e8 541
b1e2b3ae
JH		 542 get_random_bytes(&rpa->b[3], 3);
543
544 rpa->b[5] &= 0x3f; /* Clear two most significant bits */
545 rpa->b[5] |= 0x40; /* Set second most significant bit */
546
88a479d9 547 err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b);
b1e2b3ae
JH		 548 if (err < 0)
549 return err;
550
551 BT_DBG("RPA %pMR", rpa);
552
553 return 0;
554}
555
60a27d65
MH		 556int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
557{
558 struct l2cap_chan *chan = hdev->smp_data;
559 struct smp_dev *smp;
560 int err;
561
562 if (!chan || !chan->data)
563 return -EOPNOTSUPP;
564
565 smp = chan->data;
566
567 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
568 BT_DBG("Using debug keys");
c0153b0b
TA		 569 err = set_ecdh_privkey(smp->tfm_ecdh, debug_sk);
570 if (err)
571 return err;
60a27d65 572 memcpy(smp->local_pk, debug_pk, 64);
60a27d65
MH		 573 smp->debug_key = true;
574 } else {
575 while (true) {
c0153b0b
TA		 576 /* Generate key pair for Secure Connections */
577 err = generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk);
a2976416
TA		 578 if (err)
579 return err;
60a27d65
MH		 580
581 /* This is unlikely, but we need to check that
582 * we didn't accidentially generate a debug key.
583 */
c0153b0b 584 if (crypto_memneq(smp->local_pk, debug_pk, 64))
60a27d65
MH		 585 break;
586 }
587 smp->debug_key = false;
588 }
589
590 SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
591 SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
60a27d65 592
fb334fee 593 get_random_bytes(smp->local_rand, 16);
60a27d65
MH		 594
595 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
fb334fee 596 smp->local_rand, 0, hash);
60a27d65
MH		 597 if (err < 0)
598 return err;
599
fb334fee 600 memcpy(rand, smp->local_rand, 16);
60a27d65
MH		 601
602 return 0;
603}
604
5d88cc73 605static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
eb492e01 606{
5d88cc73 607 struct l2cap_chan *chan = conn->smp;
b68fda68 608 struct smp_chan *smp;
5d88cc73
JH		 609 struct kvec iv[2];
610 struct msghdr msg;
eb492e01 611
5d88cc73
JH		 612 if (!chan)
613 return;
eb492e01 614
5d88cc73 615 BT_DBG("code 0x%2.2x", code);
eb492e01 616
5d88cc73
JH		 617 iv[0].iov_base = &code;
618 iv[0].iov_len = 1;
eb492e01 619
5d88cc73
JH		 620 iv[1].iov_base = data;
621 iv[1].iov_len = len;
eb492e01 622
5d88cc73 623 memset(&msg, 0, sizeof(msg));
eb492e01 624
17836394 625 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len);
eb492e01 626
5d88cc73 627 l2cap_chan_send(chan, &msg, 1 + len);
e2dcd113 628
b68fda68
JH		 629 if (!chan->data)
630 return;
631
632 smp = chan->data;
633
634 cancel_delayed_work_sync(&smp->security_timer);
1b0921d6 635 schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
eb492e01
AB		 636}
637
d2eb9e10 638static u8 authreq_to_seclevel(u8 authreq)
2b64d153 639{
d2eb9e10
JH		 640 if (authreq & SMP_AUTH_MITM) {
641 if (authreq & SMP_AUTH_SC)
642 return BT_SECURITY_FIPS;
643 else
644 return BT_SECURITY_HIGH;
645 } else {
2b64d153 646 return BT_SECURITY_MEDIUM;
d2eb9e10 647 }
2b64d153
BG		 648}
649
650static __u8 seclevel_to_authreq(__u8 sec_level)
651{
652 switch (sec_level) {
d2eb9e10 653 case BT_SECURITY_FIPS:
2b64d153
BG		 654 case BT_SECURITY_HIGH:
655 return SMP_AUTH_MITM | SMP_AUTH_BONDING;
656 case BT_SECURITY_MEDIUM:
657 return SMP_AUTH_BONDING;
658 default:
659 return SMP_AUTH_NONE;
660 }
661}
662
b8e66eac 663static void build_pairing_cmd(struct l2cap_conn *conn,
f1560463
MH		 664 struct smp_cmd_pairing *req,
665 struct smp_cmd_pairing *rsp, __u8 authreq)
b8e66eac 666{
5d88cc73
JH		 667 struct l2cap_chan *chan = conn->smp;
668 struct smp_chan *smp = chan->data;
fd349c02
JH		 669 struct hci_conn *hcon = conn->hcon;
670 struct hci_dev *hdev = hcon->hdev;
02b05bd8 671 u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT;
54790f73 672
d7a5a11d 673 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
7ee4ea36
MH		 674 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
675 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
54790f73 676 authreq |= SMP_AUTH_BONDING;
2b64d153
BG		 677 } else {
678 authreq &= ~SMP_AUTH_BONDING;
54790f73
VCG		 679 }
680
d7a5a11d 681 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
fd349c02
JH		 682 remote_dist |= SMP_DIST_ID_KEY;
683
d7a5a11d 684 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
863efaf2
JH		 685 local_dist |= SMP_DIST_ID_KEY;
686
d7a5a11d 687 if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&
02b05bd8
JH		 688 (authreq & SMP_AUTH_SC)) {
689 struct oob_data *oob_data;
690 u8 bdaddr_type;
691
d7a5a11d 692 if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
df8e1a4c
JH		 693 local_dist |= SMP_DIST_LINK_KEY;
694 remote_dist |= SMP_DIST_LINK_KEY;
695 }
02b05bd8
JH		 696
697 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
698 bdaddr_type = BDADDR_LE_PUBLIC;
699 else
700 bdaddr_type = BDADDR_LE_RANDOM;
701
702 oob_data = hci_find_remote_oob_data(hdev, &hcon->dst,
703 bdaddr_type);
4775a4ea 704 if (oob_data && oob_data->present) {
1a8bab4f 705 set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags);
02b05bd8 706 oob_flag = SMP_OOB_PRESENT;
a29b0733 707 memcpy(smp->rr, oob_data->rand256, 16);
02b05bd8 708 memcpy(smp->pcnf, oob_data->hash256, 16);
bc07cd69
MH		 709 SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf);
710 SMP_DBG("OOB Remote Random: %16phN", smp->rr);
02b05bd8
JH		 711 }
712
df8e1a4c
JH		 713 } else {
714 authreq &= ~SMP_AUTH_SC;
715 }
716
54790f73
VCG		 717 if (rsp == NULL) {
718 req->io_capability = conn->hcon->io_capability;
02b05bd8 719 req->oob_flag = oob_flag;
2fd36558 720 req->max_key_size = SMP_DEV(hdev)->max_key_size;
fd349c02
JH		 721 req->init_key_dist = local_dist;
722 req->resp_key_dist = remote_dist;
0edb14de 723 req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 724
725 smp->remote_key_dist = remote_dist;
54790f73
VCG		 726 return;
727 }
728
729 rsp->io_capability = conn->hcon->io_capability;
02b05bd8 730 rsp->oob_flag = oob_flag;
2fd36558 731 rsp->max_key_size = SMP_DEV(hdev)->max_key_size;
fd349c02
JH		 732 rsp->init_key_dist = req->init_key_dist & remote_dist;
733 rsp->resp_key_dist = req->resp_key_dist & local_dist;
0edb14de 734 rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 735
736 smp->remote_key_dist = rsp->init_key_dist;
b8e66eac
VCG		 737}
738
3158c50c
VCG		 739static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
740{
5d88cc73 741 struct l2cap_chan *chan = conn->smp;
2fd36558 742 struct hci_dev *hdev = conn->hcon->hdev;
5d88cc73 743 struct smp_chan *smp = chan->data;
1c1def09 744
2fd36558
JH		 745 if (max_key_size > SMP_DEV(hdev)->max_key_size ||
746 max_key_size < SMP_MIN_ENC_KEY_SIZE)
3158c50c
VCG		 747 return SMP_ENC_KEY_SIZE;
748
f7aa611a 749 smp->enc_key_size = max_key_size;
3158c50c
VCG		 750
751 return 0;
752}
753
6f48e260
JH		 754static void smp_chan_destroy(struct l2cap_conn *conn)
755{
756 struct l2cap_chan *chan = conn->smp;
757 struct smp_chan *smp = chan->data;
923e2414 758 struct hci_conn *hcon = conn->hcon;
6f48e260
JH		 759 bool complete;
760
761 BUG_ON(!smp);
762
763 cancel_delayed_work_sync(&smp->security_timer);
6f48e260 764
6f48e260 765 complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
923e2414 766 mgmt_smp_complete(hcon, complete);
6f48e260 767
276812ec
MH		 768 kzfree(smp->csrk);
769 kzfree(smp->slave_csrk);
770 kzfree(smp->link_key);
6f48e260 771
a4770e11 772 crypto_free_cipher(smp->tfm_aes);
71af2f6b 773 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 774 crypto_free_kpp(smp->tfm_ecdh);
6f48e260 775
923e2414
JH		 776 /* Ensure that we don't leave any debug key around if debug key
777 * support hasn't been explicitly enabled.
778 */
779 if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG &&
d7a5a11d 780 !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) {
923e2414
JH		 781 list_del_rcu(&smp->ltk->list);
782 kfree_rcu(smp->ltk, rcu);
783 smp->ltk = NULL;
784 }
785
6f48e260
JH		 786 /* If pairing failed clean up any keys we might have */
787 if (!complete) {
788 if (smp->ltk) {
970d0f1b
JH		 789 list_del_rcu(&smp->ltk->list);
790 kfree_rcu(smp->ltk, rcu);
6f48e260
JH		 791 }
792
793 if (smp->slave_ltk) {
970d0f1b
JH		 794 list_del_rcu(&smp->slave_ltk->list);
795 kfree_rcu(smp->slave_ltk, rcu);
6f48e260
JH		 796 }
797
798 if (smp->remote_irk) {
adae20cb
JH		 799 list_del_rcu(&smp->remote_irk->list);
800 kfree_rcu(smp->remote_irk, rcu);
6f48e260
JH		 801 }
802 }
803
804 chan->data = NULL;
276812ec 805 kzfree(smp);
923e2414 806 hci_conn_drop(hcon);
6f48e260
JH		 807}
808
84794e11 809static void smp_failure(struct l2cap_conn *conn, u8 reason)
4f957a76 810{
bab73cb6 811 struct hci_conn *hcon = conn->hcon;
b68fda68 812 struct l2cap_chan *chan = conn->smp;
bab73cb6 813
84794e11 814 if (reason)
4f957a76 815 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
f1560463 816 &reason);
4f957a76 817
e1e930f5 818 mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE);
f1c09c07 819
fc75cc86 820 if (chan->data)
f1c09c07 821 smp_chan_destroy(conn);
4f957a76
BG		 822}
823
2b64d153
BG		 824#define JUST_WORKS 0x00
825#define JUST_CFM 0x01
826#define REQ_PASSKEY 0x02
827#define CFM_PASSKEY 0x03
828#define REQ_OOB 0x04
5e3d3d9b 829#define DSP_PASSKEY 0x05
2b64d153
BG		 830#define OVERLAP 0xFF
831
832static const u8 gen_method[5][5] = {
833 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
834 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
835 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
836 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
837 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
838};
839
5e3d3d9b
JH		 840static const u8 sc_method[5][5] = {
841 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
842 { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
843 { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY },
844 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
845 { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
846};
847
581370cc
JH		 848static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io)
849{
2bcd4003
JH		 850 /* If either side has unknown io_caps, use JUST_CFM (which gets
851 * converted later to JUST_WORKS if we're initiators.
852 */
581370cc
JH		 853 if (local_io > SMP_IO_KEYBOARD_DISPLAY ||
854 remote_io > SMP_IO_KEYBOARD_DISPLAY)
2bcd4003 855 return JUST_CFM;
581370cc 856
5e3d3d9b
JH		 857 if (test_bit(SMP_FLAG_SC, &smp->flags))
858 return sc_method[remote_io][local_io];
859
581370cc
JH		 860 return gen_method[remote_io][local_io];
861}
862
2b64d153
BG		 863static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
864 u8 local_io, u8 remote_io)
865{
866 struct hci_conn *hcon = conn->hcon;
5d88cc73
JH		 867 struct l2cap_chan *chan = conn->smp;
868 struct smp_chan *smp = chan->data;
2b64d153
BG		 869 u32 passkey = 0;
870 int ret = 0;
871
872 /* Initialize key for JUST WORKS */
873 memset(smp->tk, 0, sizeof(smp->tk));
4a74d658 874 clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 875
876 BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io);
877
2bcd4003
JH		 878 /* If neither side wants MITM, either "just" confirm an incoming
879 * request or use just-works for outgoing ones. The JUST_CFM
880 * will be converted to JUST_WORKS if necessary later in this
881 * function. If either side has MITM look up the method from the
882 * table.
883 */
581370cc 884 if (!(auth & SMP_AUTH_MITM))
783e0574 885 smp->method = JUST_CFM;
2b64d153 886 else
783e0574 887 smp->method = get_auth_method(smp, local_io, remote_io);
2b64d153 888
a82505c7 889 /* Don't confirm locally initiated pairing attempts */
783e0574
JH		 890 if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
891 &smp->flags))
892 smp->method = JUST_WORKS;
a82505c7 893
02f3e254 894 /* Don't bother user space with no IO capabilities */
783e0574
JH		 895 if (smp->method == JUST_CFM &&
896 hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
897 smp->method = JUST_WORKS;
02f3e254 898
2b64d153 899 /* If Just Works, Continue with Zero TK */
783e0574 900 if (smp->method == JUST_WORKS) {
4a74d658 901 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 902 return 0;
903 }
904
19c5ce9c
JH		 905 /* If this function is used for SC -> legacy fallback we
906 * can only recover the just-works case.
907 */
908 if (test_bit(SMP_FLAG_SC, &smp->flags))
909 return -EINVAL;
910
2b64d153 911 /* Not Just Works/Confirm results in MITM Authentication */
783e0574 912 if (smp->method != JUST_CFM) {
4a74d658 913 set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
5eb596f5
JH		 914 if (hcon->pending_sec_level < BT_SECURITY_HIGH)
915 hcon->pending_sec_level = BT_SECURITY_HIGH;
916 }
2b64d153
BG		 917
918 /* If both devices have Keyoard-Display I/O, the master
919 * Confirms and the slave Enters the passkey.
920 */
783e0574 921 if (smp->method == OVERLAP) {
40bef302 922 if (hcon->role == HCI_ROLE_MASTER)
783e0574 923 smp->method = CFM_PASSKEY;
2b64d153 924 else
783e0574 925 smp->method = REQ_PASSKEY;
2b64d153
BG		 926 }
927
01ad34d2 928 /* Generate random passkey. */
783e0574 929 if (smp->method == CFM_PASSKEY) {
943a732a 930 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153
BG		 931 get_random_bytes(&passkey, sizeof(passkey));
932 passkey %= 1000000;
943a732a 933 put_unaligned_le32(passkey, smp->tk);
2b64d153 934 BT_DBG("PassKey: %d", passkey);
4a74d658 935 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 936 }
937
783e0574 938 if (smp->method == REQ_PASSKEY)
ce39fb4e 939 ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst,
272d90df 940 hcon->type, hcon->dst_type);
783e0574 941 else if (smp->method == JUST_CFM)
4eb65e66
JH		 942 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
943 hcon->type, hcon->dst_type,
944 passkey, 1);
2b64d153 945 else
01ad34d2 946 ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst,
272d90df 947 hcon->type, hcon->dst_type,
39adbffe 948 passkey, 0);
2b64d153 949
2b64d153
BG		 950 return ret;
951}
952
1cc61144 953static u8 smp_confirm(struct smp_chan *smp)
8aab4757 954{
8aab4757 955 struct l2cap_conn *conn = smp->conn;
8aab4757
VCG		 956 struct smp_cmd_pairing_confirm cp;
957 int ret;
8aab4757
VCG		 958
959 BT_DBG("conn %p", conn);
960
e491eaf3 961 ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp,
b1cd5fd9 962 conn->hcon->init_addr_type, &conn->hcon->init_addr,
943a732a
JH		 963 conn->hcon->resp_addr_type, &conn->hcon->resp_addr,
964 cp.confirm_val);
1cc61144
JH		 965 if (ret)
966 return SMP_UNSPECIFIED;
8aab4757 967
4a74d658 968 clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153 969
8aab4757
VCG		 970 smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
971
b28b4943
JH		 972 if (conn->hcon->out)
973 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
974 else
975 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
976
1cc61144 977 return 0;
8aab4757
VCG		 978}
979
861580a9 980static u8 smp_random(struct smp_chan *smp)
8aab4757 981{
8aab4757
VCG		 982 struct l2cap_conn *conn = smp->conn;
983 struct hci_conn *hcon = conn->hcon;
861580a9 984 u8 confirm[16];
8aab4757
VCG		 985 int ret;
986
ec70f36f 987 if (IS_ERR_OR_NULL(smp->tfm_aes))
861580a9 988 return SMP_UNSPECIFIED;
8aab4757
VCG		 989
990 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
991
e491eaf3 992 ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp,
b1cd5fd9 993 hcon->init_addr_type, &hcon->init_addr,
943a732a 994 hcon->resp_addr_type, &hcon->resp_addr, confirm);
861580a9
JH		 995 if (ret)
996 return SMP_UNSPECIFIED;
8aab4757 997
329d8230 998 if (crypto_memneq(smp->pcnf, confirm, sizeof(smp->pcnf))) {
2064ee33
MH		 999 bt_dev_err(hcon->hdev, "pairing failed "
1000 "(confirmation values mismatch)");
861580a9 1001 return SMP_CONFIRM_FAILED;
8aab4757
VCG		 1002 }
1003
1004 if (hcon->out) {
fe39c7b2
MH		 1005 u8 stk[16];
1006 __le64 rand = 0;
1007 __le16 ediv = 0;
8aab4757 1008
e491eaf3 1009 smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk);
8aab4757 1010
861580a9
JH		 1011 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
1012 return SMP_UNSPECIFIED;
8aab4757 1013
8b76ce34 1014 hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size);
f7aa611a 1015 hcon->enc_key_size = smp->enc_key_size;
fe59a05f 1016 set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
8aab4757 1017 } else {
fff3490f 1018 u8 stk[16], auth;
fe39c7b2
MH		 1019 __le64 rand = 0;
1020 __le16 ediv = 0;
8aab4757 1021
943a732a
JH		 1022 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
1023 smp->prnd);
8aab4757 1024
e491eaf3 1025 smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk);
8aab4757 1026
fff3490f
JH		 1027 if (hcon->pending_sec_level == BT_SECURITY_HIGH)
1028 auth = 1;
1029 else
1030 auth = 0;
1031
7d5843b7
JH		 1032 /* Even though there's no _SLAVE suffix this is the
1033 * slave STK we're adding for later lookup (the master
1034 * STK never needs to be stored).
1035 */
ce39fb4e 1036 hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
2ceba539 1037 SMP_STK, auth, stk, smp->enc_key_size, ediv, rand);
8aab4757
VCG		 1038 }
1039
861580a9 1040 return 0;
8aab4757
VCG		 1041}
1042
44f1a7ab
JH		 1043static void smp_notify_keys(struct l2cap_conn *conn)
1044{
1045 struct l2cap_chan *chan = conn->smp;
1046 struct smp_chan *smp = chan->data;
1047 struct hci_conn *hcon = conn->hcon;
1048 struct hci_dev *hdev = hcon->hdev;
1049 struct smp_cmd_pairing *req = (void *) &smp->preq[1];
1050 struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1];
1051 bool persistent;
1052
cad20c27
JH		 1053 if (hcon->type == ACL_LINK) {
1054 if (hcon->key_type == HCI_LK_DEBUG_COMBINATION)
1055 persistent = false;
1056 else
1057 persistent = !test_bit(HCI_CONN_FLUSH_KEY,
1058 &hcon->flags);
1059 } else {
1060 /* The LTKs, IRKs and CSRKs should be persistent only if
1061 * both sides had the bonding bit set in their
1062 * authentication requests.
1063 */
1064 persistent = !!((req->auth_req & rsp->auth_req) &
1065 SMP_AUTH_BONDING);
1066 }
1067
44f1a7ab 1068 if (smp->remote_irk) {
cad20c27
JH		 1069 mgmt_new_irk(hdev, smp->remote_irk, persistent);
1070
44f1a7ab
JH		 1071 /* Now that user space can be considered to know the
1072 * identity address track the connection based on it
b5ae344d 1073 * from now on (assuming this is an LE link).
44f1a7ab 1074 */
b5ae344d
JH		 1075 if (hcon->type == LE_LINK) {
1076 bacpy(&hcon->dst, &smp->remote_irk->bdaddr);
1077 hcon->dst_type = smp->remote_irk->addr_type;
1078 queue_work(hdev->workqueue, &conn->id_addr_update_work);
1079 }
44f1a7ab
JH		 1080 }
1081
44f1a7ab
JH		 1082 if (smp->csrk) {
1083 smp->csrk->bdaddr_type = hcon->dst_type;
1084 bacpy(&smp->csrk->bdaddr, &hcon->dst);
1085 mgmt_new_csrk(hdev, smp->csrk, persistent);
1086 }
1087
1088 if (smp->slave_csrk) {
1089 smp->slave_csrk->bdaddr_type = hcon->dst_type;
1090 bacpy(&smp->slave_csrk->bdaddr, &hcon->dst);
1091 mgmt_new_csrk(hdev, smp->slave_csrk, persistent);
1092 }
1093
1094 if (smp->ltk) {
1095 smp->ltk->bdaddr_type = hcon->dst_type;
1096 bacpy(&smp->ltk->bdaddr, &hcon->dst);
1097 mgmt_new_ltk(hdev, smp->ltk, persistent);
1098 }
1099
1100 if (smp->slave_ltk) {
1101 smp->slave_ltk->bdaddr_type = hcon->dst_type;
1102 bacpy(&smp->slave_ltk->bdaddr, &hcon->dst);
1103 mgmt_new_ltk(hdev, smp->slave_ltk, persistent);
1104 }
6a77083a
JH		 1105
1106 if (smp->link_key) {
e3befab9
JH		 1107 struct link_key *key;
1108 u8 type;
1109
1110 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1111 type = HCI_LK_DEBUG_COMBINATION;
1112 else if (hcon->sec_level == BT_SECURITY_FIPS)
1113 type = HCI_LK_AUTH_COMBINATION_P256;
1114 else
1115 type = HCI_LK_UNAUTH_COMBINATION_P256;
1116
1117 key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst,
1118 smp->link_key, type, 0, &persistent);
1119 if (key) {
1120 mgmt_new_link_key(hdev, key, persistent);
1121
1122 /* Don't keep debug keys around if the relevant
1123 * flag is not set.
1124 */
d7a5a11d 1125 if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) &&
e3befab9
JH		 1126 key->type == HCI_LK_DEBUG_COMBINATION) {
1127 list_del_rcu(&key->list);
1128 kfree_rcu(key, rcu);
1129 }
1130 }
6a77083a
JH		 1131 }
1132}
1133
d3e54a87
JH		 1134static void sc_add_ltk(struct smp_chan *smp)
1135{
1136 struct hci_conn *hcon = smp->conn->hcon;
1137 u8 key_type, auth;
1138
1139 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1140 key_type = SMP_LTK_P256_DEBUG;
1141 else
1142 key_type = SMP_LTK_P256;
1143
1144 if (hcon->pending_sec_level == BT_SECURITY_FIPS)
1145 auth = 1;
1146 else
1147 auth = 0;
1148
d3e54a87
JH		 1149 smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
1150 key_type, auth, smp->tk, smp->enc_key_size,
1151 0, 0);
1152}
1153
6a77083a
JH		 1154static void sc_generate_link_key(struct smp_chan *smp)
1155{
a62da6f1 1156 /* From core spec. Spells out in ASCII as 'lebr'. */
6a77083a
JH		 1157 const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c };
1158
1159 smp->link_key = kzalloc(16, GFP_KERNEL);
1160 if (!smp->link_key)
1161 return;
1162
a62da6f1
JH		 1163 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
1164 /* SALT = 0x00000000000000000000000000000000746D7031 */
1165 const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 };
1166
1167 if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) {
1168 kzfree(smp->link_key);
1169 smp->link_key = NULL;
1170 return;
1171 }
1172 } else {
1173 /* From core spec. Spells out in ASCII as 'tmp1'. */
1174 const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 };
1175
1176 if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) {
1177 kzfree(smp->link_key);
1178 smp->link_key = NULL;
1179 return;
1180 }
6a77083a
JH		 1181 }
1182
1183 if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) {
276812ec 1184 kzfree(smp->link_key);
6a77083a
JH		 1185 smp->link_key = NULL;
1186 return;
1187 }
44f1a7ab
JH		 1188}
1189
b28b4943
JH		 1190static void smp_allow_key_dist(struct smp_chan *smp)
1191{
1192 /* Allow the first expected phase 3 PDU. The rest of the PDUs
1193 * will be allowed in each PDU handler to ensure we receive
1194 * them in the correct order.
1195 */
1196 if (smp->remote_key_dist & SMP_DIST_ENC_KEY)
1197 SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO);
1198 else if (smp->remote_key_dist & SMP_DIST_ID_KEY)
1199 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
1200 else if (smp->remote_key_dist & SMP_DIST_SIGN)
1201 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
1202}
1203
b5ae344d
JH		 1204static void sc_generate_ltk(struct smp_chan *smp)
1205{
a62da6f1 1206 /* From core spec. Spells out in ASCII as 'brle'. */
b5ae344d
JH		 1207 const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 };
1208 struct hci_conn *hcon = smp->conn->hcon;
1209 struct hci_dev *hdev = hcon->hdev;
1210 struct link_key *key;
1211
1212 key = hci_find_link_key(hdev, &hcon->dst);
1213 if (!key) {
2064ee33 1214 bt_dev_err(hdev, "no Link Key found to generate LTK");
b5ae344d
JH		 1215 return;
1216 }
1217
1218 if (key->type == HCI_LK_DEBUG_COMBINATION)
1219 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1220
a62da6f1
JH		 1221 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
1222 /* SALT = 0x00000000000000000000000000000000746D7032 */
1223 const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 };
1224
1225 if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk))
1226 return;
1227 } else {
1228 /* From core spec. Spells out in ASCII as 'tmp2'. */
1229 const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 };
1230
1231 if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk))
1232 return;
1233 }
b5ae344d
JH		 1234
1235 if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk))
1236 return;
1237
1238 sc_add_ltk(smp);
1239}
1240
d6268e86 1241static void smp_distribute_keys(struct smp_chan *smp)
44f1a7ab
JH		 1242{
1243 struct smp_cmd_pairing *req, *rsp;
86d1407c 1244 struct l2cap_conn *conn = smp->conn;
44f1a7ab
JH		 1245 struct hci_conn *hcon = conn->hcon;
1246 struct hci_dev *hdev = hcon->hdev;
1247 __u8 *keydist;
1248
1249 BT_DBG("conn %p", conn);
1250
44f1a7ab
JH		 1251 rsp = (void *) &smp->prsp[1];
1252
1253 /* The responder sends its keys first */
b28b4943
JH		 1254 if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) {
1255 smp_allow_key_dist(smp);
86d1407c 1256 return;
b28b4943 1257 }
44f1a7ab
JH		 1258
1259 req = (void *) &smp->preq[1];
1260
1261 if (hcon->out) {
1262 keydist = &rsp->init_key_dist;
1263 *keydist &= req->init_key_dist;
1264 } else {
1265 keydist = &rsp->resp_key_dist;
1266 *keydist &= req->resp_key_dist;
1267 }
1268
6a77083a 1269 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
b5ae344d 1270 if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY))
6a77083a 1271 sc_generate_link_key(smp);
b5ae344d
JH		 1272 if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY))
1273 sc_generate_ltk(smp);
6a77083a
JH		 1274
1275 /* Clear the keys which are generated but not distributed */
1276 *keydist &= ~SMP_SC_NO_DIST;
1277 }
1278
44f1a7ab
JH		 1279 BT_DBG("keydist 0x%x", *keydist);
1280
1281 if (*keydist & SMP_DIST_ENC_KEY) {
1282 struct smp_cmd_encrypt_info enc;
1283 struct smp_cmd_master_ident ident;
1284 struct smp_ltk *ltk;
1285 u8 authenticated;
1286 __le16 ediv;
1287 __le64 rand;
1288
1fc62c52
JH		 1289 /* Make sure we generate only the significant amount of
1290 * bytes based on the encryption key size, and set the rest
1291 * of the value to zeroes.
1292 */
1293 get_random_bytes(enc.ltk, smp->enc_key_size);
1294 memset(enc.ltk + smp->enc_key_size, 0,
1295 sizeof(enc.ltk) - smp->enc_key_size);
1296
44f1a7ab
JH		 1297 get_random_bytes(&ediv, sizeof(ediv));
1298 get_random_bytes(&rand, sizeof(rand));
1299
1300 smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
1301
1302 authenticated = hcon->sec_level == BT_SECURITY_HIGH;
1303 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type,
1304 SMP_LTK_SLAVE, authenticated, enc.ltk,
1305 smp->enc_key_size, ediv, rand);
1306 smp->slave_ltk = ltk;
1307
1308 ident.ediv = ediv;
1309 ident.rand = rand;
1310
1311 smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident);
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 }
1354 smp->slave_csrk = csrk;
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
1379 BT_DBG("conn %p", conn);
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{
5d88cc73 1386 struct l2cap_chan *chan = conn->smp;
8aab4757
VCG		 1387 struct smp_chan *smp;
1388
f1560463 1389 smp = kzalloc(sizeof(*smp), GFP_ATOMIC);
fc75cc86 1390 if (!smp)
8aab4757
VCG		 1391 return NULL;
1392
a4770e11 1393 smp->tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
6a7bd103 1394 if (IS_ERR(smp->tfm_aes)) {
a4770e11 1395 BT_ERR("Unable to create AES crypto context");
47eb2ac8 1396 goto zfree_smp;
6a7bd103
JH		 1397 }
1398
71af2f6b 1399 smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
407cecf6
JH		 1400 if (IS_ERR(smp->tfm_cmac)) {
1401 BT_ERR("Unable to create CMAC crypto context");
47eb2ac8
TA		 1402 goto free_cipher;
1403 }
1404
1405 smp->tfm_ecdh = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0);
1406 if (IS_ERR(smp->tfm_ecdh)) {
1407 BT_ERR("Unable to create ECDH crypto context");
1408 goto free_shash;
407cecf6
JH		 1409 }
1410
8aab4757 1411 smp->conn = conn;
5d88cc73 1412 chan->data = smp;
8aab4757 1413
b28b4943
JH		 1414 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL);
1415
b68fda68
JH		 1416 INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
1417
8aab4757
VCG		 1418 hci_conn_hold(conn->hcon);
1419
1420 return smp;
47eb2ac8
TA		 1421
1422free_shash:
1423 crypto_free_shash(smp->tfm_cmac);
1424free_cipher:
1425 crypto_free_cipher(smp->tfm_aes);
1426zfree_smp:
1427 kzfree(smp);
1428 return NULL;
8aab4757
VCG		 1429}
1430
760b018b
JH		 1431static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16])
1432{
1433 struct hci_conn *hcon = smp->conn->hcon;
1434 u8 *na, *nb, a[7], b[7];
1435
1436 if (hcon->out) {
1437 na = smp->prnd;
1438 nb = smp->rrnd;
1439 } else {
1440 na = smp->rrnd;
1441 nb = smp->prnd;
1442 }
1443
1444 memcpy(a, &hcon->init_addr, 6);
1445 memcpy(b, &hcon->resp_addr, 6);
1446 a[6] = hcon->init_addr_type;
1447 b[6] = hcon->resp_addr_type;
1448
1449 return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk);
1450}
1451
38606f14 1452static void sc_dhkey_check(struct smp_chan *smp)
760b018b
JH		 1453{
1454 struct hci_conn *hcon = smp->conn->hcon;
1455 struct smp_cmd_dhkey_check check;
1456 u8 a[7], b[7], *local_addr, *remote_addr;
1457 u8 io_cap[3], r[16];
1458
760b018b
JH		 1459 memcpy(a, &hcon->init_addr, 6);
1460 memcpy(b, &hcon->resp_addr, 6);
1461 a[6] = hcon->init_addr_type;
1462 b[6] = hcon->resp_addr_type;
1463
1464 if (hcon->out) {
1465 local_addr = a;
1466 remote_addr = b;
1467 memcpy(io_cap, &smp->preq[1], 3);
1468 } else {
1469 local_addr = b;
1470 remote_addr = a;
1471 memcpy(io_cap, &smp->prsp[1], 3);
1472 }
1473
dddd3059
JH		 1474 memset(r, 0, sizeof(r));
1475
1476 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
38606f14 1477 put_unaligned_le32(hcon->passkey_notify, r);
760b018b 1478
a29b0733
JH		 1479 if (smp->method == REQ_OOB)
1480 memcpy(r, smp->rr, 16);
1481
760b018b
JH		 1482 smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
1483 local_addr, remote_addr, check.e);
1484
1485 smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check);
dddd3059
JH		 1486}
1487
38606f14
JH		 1488static u8 sc_passkey_send_confirm(struct smp_chan *smp)
1489{
1490 struct l2cap_conn *conn = smp->conn;
1491 struct hci_conn *hcon = conn->hcon;
1492 struct smp_cmd_pairing_confirm cfm;
1493 u8 r;
1494
1495 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1496 r |= 0x80;
1497
1498 get_random_bytes(smp->prnd, sizeof(smp->prnd));
1499
1500 if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r,
1501 cfm.confirm_val))
1502 return SMP_UNSPECIFIED;
1503
1504 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
1505
1506 return 0;
1507}
1508
1509static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op)
1510{
1511 struct l2cap_conn *conn = smp->conn;
1512 struct hci_conn *hcon = conn->hcon;
1513 struct hci_dev *hdev = hcon->hdev;
1514 u8 cfm[16], r;
1515
1516 /* Ignore the PDU if we've already done 20 rounds (0 - 19) */
1517 if (smp->passkey_round >= 20)
1518 return 0;
1519
1520 switch (smp_op) {
1521 case SMP_CMD_PAIRING_RANDOM:
1522 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1523 r |= 0x80;
1524
1525 if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
1526 smp->rrnd, r, cfm))
1527 return SMP_UNSPECIFIED;
1528
329d8230 1529 if (crypto_memneq(smp->pcnf, cfm, 16))
38606f14
JH		 1530 return SMP_CONFIRM_FAILED;
1531
1532 smp->passkey_round++;
1533
1534 if (smp->passkey_round == 20) {
1535 /* Generate MacKey and LTK */
1536 if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk))
1537 return SMP_UNSPECIFIED;
1538 }
1539
1540 /* The round is only complete when the initiator
1541 * receives pairing random.
1542 */
1543 if (!hcon->out) {
1544 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1545 sizeof(smp->prnd), smp->prnd);
d3e54a87 1546 if (smp->passkey_round == 20)
38606f14 1547 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
d3e54a87 1548 else
38606f14 1549 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
38606f14
JH		 1550 return 0;
1551 }
1552
1553 /* Start the next round */
1554 if (smp->passkey_round != 20)
1555 return sc_passkey_round(smp, 0);
1556
1557 /* Passkey rounds are complete - start DHKey Check */
1558 sc_dhkey_check(smp);
1559 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1560
1561 break;
1562
1563 case SMP_CMD_PAIRING_CONFIRM:
1564 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
1565 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
1566 return 0;
1567 }
1568
1569 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1570
1571 if (hcon->out) {
1572 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1573 sizeof(smp->prnd), smp->prnd);
1574 return 0;
1575 }
1576
1577 return sc_passkey_send_confirm(smp);
1578
1579 case SMP_CMD_PUBLIC_KEY:
1580 default:
1581 /* Initiating device starts the round */
1582 if (!hcon->out)
1583 return 0;
1584
1585 BT_DBG("%s Starting passkey round %u", hdev->name,
1586 smp->passkey_round + 1);
1587
1588 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1589
1590 return sc_passkey_send_confirm(smp);
1591 }
1592
1593 return 0;
1594}
1595
dddd3059
JH		 1596static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey)
1597{
38606f14
JH		 1598 struct l2cap_conn *conn = smp->conn;
1599 struct hci_conn *hcon = conn->hcon;
1600 u8 smp_op;
1601
1602 clear_bit(SMP_FLAG_WAIT_USER, &smp->flags);
1603
dddd3059
JH		 1604 switch (mgmt_op) {
1605 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1606 smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED);
1607 return 0;
1608 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
1609 smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED);
1610 return 0;
38606f14
JH		 1611 case MGMT_OP_USER_PASSKEY_REPLY:
1612 hcon->passkey_notify = le32_to_cpu(passkey);
1613 smp->passkey_round = 0;
1614
1615 if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags))
1616 smp_op = SMP_CMD_PAIRING_CONFIRM;
1617 else
1618 smp_op = 0;
1619
1620 if (sc_passkey_round(smp, smp_op))
1621 return -EIO;
1622
1623 return 0;
dddd3059
JH		 1624 }
1625
d3e54a87
JH		 1626 /* Initiator sends DHKey check first */
1627 if (hcon->out) {
1628 sc_dhkey_check(smp);
1629 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1630 } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) {
1631 sc_dhkey_check(smp);
1632 sc_add_ltk(smp);
1633 }
760b018b
JH		 1634
1635 return 0;
1636}
1637
2b64d153
BG		 1638int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
1639{
b10e8017 1640 struct l2cap_conn *conn = hcon->l2cap_data;
5d88cc73 1641 struct l2cap_chan *chan;
2b64d153
BG		 1642 struct smp_chan *smp;
1643 u32 value;
fc75cc86 1644 int err;
2b64d153
BG		 1645
1646 BT_DBG("");
1647
fc75cc86 1648 if (!conn)
2b64d153
BG		 1649 return -ENOTCONN;
1650
5d88cc73
JH		 1651 chan = conn->smp;
1652 if (!chan)
1653 return -ENOTCONN;
1654
fc75cc86
JH		 1655 l2cap_chan_lock(chan);
1656 if (!chan->data) {
1657 err = -ENOTCONN;
1658 goto unlock;
1659 }
1660
5d88cc73 1661 smp = chan->data;
2b64d153 1662
760b018b
JH		 1663 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1664 err = sc_user_reply(smp, mgmt_op, passkey);
1665 goto unlock;
1666 }
1667
2b64d153
BG		 1668 switch (mgmt_op) {
1669 case MGMT_OP_USER_PASSKEY_REPLY:
1670 value = le32_to_cpu(passkey);
943a732a 1671 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153 1672 BT_DBG("PassKey: %d", value);
943a732a 1673 put_unaligned_le32(value, smp->tk);
2b64d153
BG		 1674 /* Fall Through */
1675 case MGMT_OP_USER_CONFIRM_REPLY:
4a74d658 1676 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 1677 break;
1678 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1679 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
84794e11 1680 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1681 err = 0;
1682 goto unlock;
2b64d153 1683 default:
84794e11 1684 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1685 err = -EOPNOTSUPP;
1686 goto unlock;
2b64d153
BG		 1687 }
1688
fc75cc86
JH		 1689 err = 0;
1690
2b64d153 1691 /* If it is our turn to send Pairing Confirm, do so now */
1cc61144
JH		 1692 if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
1693 u8 rsp = smp_confirm(smp);
1694 if (rsp)
1695 smp_failure(conn, rsp);
1696 }
2b64d153 1697
fc75cc86
JH		 1698unlock:
1699 l2cap_chan_unlock(chan);
1700 return err;
2b64d153
BG		 1701}
1702
b5ae344d
JH		 1703static void build_bredr_pairing_cmd(struct smp_chan *smp,
1704 struct smp_cmd_pairing *req,
1705 struct smp_cmd_pairing *rsp)
1706{
1707 struct l2cap_conn *conn = smp->conn;
1708 struct hci_dev *hdev = conn->hcon->hdev;
1709 u8 local_dist = 0, remote_dist = 0;
1710
d7a5a11d 1711 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
b5ae344d
JH		 1712 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1713 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1714 }
1715
d7a5a11d 1716 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
b5ae344d
JH		 1717 remote_dist |= SMP_DIST_ID_KEY;
1718
d7a5a11d 1719 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
b5ae344d
JH		 1720 local_dist |= SMP_DIST_ID_KEY;
1721
1722 if (!rsp) {
1723 memset(req, 0, sizeof(*req));
1724
a62da6f1 1725 req->auth_req = SMP_AUTH_CT2;
b5ae344d
JH		 1726 req->init_key_dist = local_dist;
1727 req->resp_key_dist = remote_dist;
e3f6a257 1728 req->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1729
1730 smp->remote_key_dist = remote_dist;
1731
1732 return;
1733 }
1734
1735 memset(rsp, 0, sizeof(*rsp));
1736
a62da6f1 1737 rsp->auth_req = SMP_AUTH_CT2;
e3f6a257 1738 rsp->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1739 rsp->init_key_dist = req->init_key_dist & remote_dist;
1740 rsp->resp_key_dist = req->resp_key_dist & local_dist;
1741
1742 smp->remote_key_dist = rsp->init_key_dist;
1743}
1744
da85e5e5 1745static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1746{
3158c50c 1747 struct smp_cmd_pairing rsp, *req = (void *) skb->data;
fc75cc86 1748 struct l2cap_chan *chan = conn->smp;
b3c6410b 1749 struct hci_dev *hdev = conn->hcon->hdev;
8aab4757 1750 struct smp_chan *smp;
c7262e71 1751 u8 key_size, auth, sec_level;
8aab4757 1752 int ret;
88ba43b6
AB		 1753
1754 BT_DBG("conn %p", conn);
1755
c46b98be 1756 if (skb->len < sizeof(*req))
38e4a915 1757 return SMP_INVALID_PARAMS;
c46b98be 1758
40bef302 1759 if (conn->hcon->role != HCI_ROLE_SLAVE)
2b64d153
BG		 1760 return SMP_CMD_NOTSUPP;
1761
fc75cc86 1762 if (!chan->data)
8aab4757 1763 smp = smp_chan_create(conn);
fc75cc86 1764 else
5d88cc73 1765 smp = chan->data;
8aab4757 1766
d08fd0e7
AE		 1767 if (!smp)
1768 return SMP_UNSPECIFIED;
d26a2345 1769
c05b9339 1770 /* We didn't start the pairing, so match remote */
0edb14de 1771 auth = req->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1772
d7a5a11d 1773 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 1774 (auth & SMP_AUTH_BONDING))
b3c6410b
JH		 1775 return SMP_PAIRING_NOTSUPP;
1776
d7a5a11d 1777 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1778 return SMP_AUTH_REQUIREMENTS;
1779
1c1def09
VCG		 1780 smp->preq[0] = SMP_CMD_PAIRING_REQ;
1781 memcpy(&smp->preq[1], req, sizeof(*req));
3158c50c 1782 skb_pull(skb, sizeof(*req));
88ba43b6 1783
cb06d366
JH		 1784 /* If the remote side's OOB flag is set it means it has
1785 * successfully received our local OOB data - therefore set the
1786 * flag to indicate that local OOB is in use.
1787 */
58428563
JH		 1788 if (req->oob_flag == SMP_OOB_PRESENT)
1789 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1790
b5ae344d
JH		 1791 /* SMP over BR/EDR requires special treatment */
1792 if (conn->hcon->type == ACL_LINK) {
1793 /* We must have a BR/EDR SC link */
08f63cc5 1794 if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) &&
b7cb93e5 1795 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 1796 return SMP_CROSS_TRANSP_NOT_ALLOWED;
1797
1798 set_bit(SMP_FLAG_SC, &smp->flags);
1799
1800 build_bredr_pairing_cmd(smp, req, &rsp);
1801
a62da6f1
JH		 1802 if (req->auth_req & SMP_AUTH_CT2)
1803 set_bit(SMP_FLAG_CT2, &smp->flags);
1804
b5ae344d
JH		 1805 key_size = min(req->max_key_size, rsp.max_key_size);
1806 if (check_enc_key_size(conn, key_size))
1807 return SMP_ENC_KEY_SIZE;
1808
1809 /* Clear bits which are generated but not distributed */
1810 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1811
1812 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1813 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
1814 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
1815
1816 smp_distribute_keys(smp);
1817 return 0;
1818 }
1819
5e3d3d9b
JH		 1820 build_pairing_cmd(conn, req, &rsp, auth);
1821
a62da6f1 1822 if (rsp.auth_req & SMP_AUTH_SC) {
5e3d3d9b
JH		 1823 set_bit(SMP_FLAG_SC, &smp->flags);
1824
a62da6f1
JH		 1825 if (rsp.auth_req & SMP_AUTH_CT2)
1826 set_bit(SMP_FLAG_CT2, &smp->flags);
1827 }
1828
5be5e275 1829 if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 1830 sec_level = BT_SECURITY_MEDIUM;
1831 else
1832 sec_level = authreq_to_seclevel(auth);
1833
c7262e71
JH		 1834 if (sec_level > conn->hcon->pending_sec_level)
1835 conn->hcon->pending_sec_level = sec_level;
fdde0a26 1836
49c922bb 1837 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1838 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1839 u8 method;
1840
1841 method = get_auth_method(smp, conn->hcon->io_capability,
1842 req->io_capability);
1843 if (method == JUST_WORKS || method == JUST_CFM)
1844 return SMP_AUTH_REQUIREMENTS;
1845 }
1846
3158c50c
VCG		 1847 key_size = min(req->max_key_size, rsp.max_key_size);
1848 if (check_enc_key_size(conn, key_size))
1849 return SMP_ENC_KEY_SIZE;
88ba43b6 1850
e84a6b13 1851 get_random_bytes(smp->prnd, sizeof(smp->prnd));
8aab4757 1852
1c1def09
VCG		 1853 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1854 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
f01ead31 1855
3158c50c 1856 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
3b19146d
JH		 1857
1858 clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
1859
19c5ce9c
JH		 1860 /* Strictly speaking we shouldn't allow Pairing Confirm for the
1861 * SC case, however some implementations incorrectly copy RFU auth
1862 * req bits from our security request, which may create a false
1863 * positive SC enablement.
1864 */
1865 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1866
3b19146d
JH		 1867 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1868 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1869 /* Clear bits which are generated but not distributed */
1870 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1871 /* Wait for Public Key from Initiating Device */
1872 return 0;
3b19146d 1873 }
da85e5e5 1874
2b64d153
BG		 1875 /* Request setup of TK */
1876 ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
1877 if (ret)
1878 return SMP_UNSPECIFIED;
1879
da85e5e5 1880 return 0;
88ba43b6
AB		 1881}
1882
3b19146d
JH		 1883static u8 sc_send_public_key(struct smp_chan *smp)
1884{
70157ef5
JH		 1885 struct hci_dev *hdev = smp->conn->hcon->hdev;
1886
3b19146d
JH		 1887 BT_DBG("");
1888
1a8bab4f 1889 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
33d0c030
MH		 1890 struct l2cap_chan *chan = hdev->smp_data;
1891 struct smp_dev *smp_dev;
1892
1893 if (!chan || !chan->data)
1894 return SMP_UNSPECIFIED;
1895
1896 smp_dev = chan->data;
1897
1898 memcpy(smp->local_pk, smp_dev->local_pk, 64);
fb334fee 1899 memcpy(smp->lr, smp_dev->local_rand, 16);
33d0c030
MH		 1900
1901 if (smp_dev->debug_key)
1902 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1903
1904 goto done;
1905 }
1906
d7a5a11d 1907 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
70157ef5 1908 BT_DBG("Using debug keys");
c0153b0b
TA		 1909 if (set_ecdh_privkey(smp->tfm_ecdh, debug_sk))
1910 return SMP_UNSPECIFIED;
70157ef5 1911 memcpy(smp->local_pk, debug_pk, 64);
70157ef5
JH		 1912 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1913 } else {
1914 while (true) {
c0153b0b
TA		 1915 /* Generate key pair for Secure Connections */
1916 if (generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk))
70157ef5 1917 return SMP_UNSPECIFIED;
6c0dcc50 1918
70157ef5
JH		 1919 /* This is unlikely, but we need to check that
1920 * we didn't accidentially generate a debug key.
1921 */
c0153b0b 1922 if (crypto_memneq(smp->local_pk, debug_pk, 64))
70157ef5
JH		 1923 break;
1924 }
6c0dcc50 1925 }
3b19146d 1926
33d0c030 1927done:
c7a3d57d 1928 SMP_DBG("Local Public Key X: %32phN", smp->local_pk);
8e4e2ee5 1929 SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32);
3b19146d
JH		 1930
1931 smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk);
1932
1933 return 0;
1934}
1935
da85e5e5 1936static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1937{
3158c50c 1938 struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
5d88cc73
JH		 1939 struct l2cap_chan *chan = conn->smp;
1940 struct smp_chan *smp = chan->data;
0edb14de 1941 struct hci_dev *hdev = conn->hcon->hdev;
3a7dbfb8 1942 u8 key_size, auth;
7d24ddcc 1943 int ret;
88ba43b6
AB		 1944
1945 BT_DBG("conn %p", conn);
1946
c46b98be 1947 if (skb->len < sizeof(*rsp))
38e4a915 1948 return SMP_INVALID_PARAMS;
c46b98be 1949
40bef302 1950 if (conn->hcon->role != HCI_ROLE_MASTER)
2b64d153
BG		 1951 return SMP_CMD_NOTSUPP;
1952
3158c50c
VCG		 1953 skb_pull(skb, sizeof(*rsp));
1954
1c1def09 1955 req = (void *) &smp->preq[1];
da85e5e5 1956
3158c50c
VCG		 1957 key_size = min(req->max_key_size, rsp->max_key_size);
1958 if (check_enc_key_size(conn, key_size))
1959 return SMP_ENC_KEY_SIZE;
1960
0edb14de 1961 auth = rsp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1962
d7a5a11d 1963 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1964 return SMP_AUTH_REQUIREMENTS;
1965
cb06d366
JH		 1966 /* If the remote side's OOB flag is set it means it has
1967 * successfully received our local OOB data - therefore set the
1968 * flag to indicate that local OOB is in use.
1969 */
58428563
JH		 1970 if (rsp->oob_flag == SMP_OOB_PRESENT)
1971 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1972
b5ae344d
JH		 1973 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1974 memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
1975
1976 /* Update remote key distribution in case the remote cleared
1977 * some bits that we had enabled in our request.
1978 */
1979 smp->remote_key_dist &= rsp->resp_key_dist;
1980
a62da6f1
JH		 1981 if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2))
1982 set_bit(SMP_FLAG_CT2, &smp->flags);
1983
b5ae344d
JH		 1984 /* For BR/EDR this means we're done and can start phase 3 */
1985 if (conn->hcon->type == ACL_LINK) {
1986 /* Clear bits which are generated but not distributed */
1987 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1988 smp_distribute_keys(smp);
1989 return 0;
1990 }
1991
65668776
JH		 1992 if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC))
1993 set_bit(SMP_FLAG_SC, &smp->flags);
d2eb9e10
JH		 1994 else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH)
1995 conn->hcon->pending_sec_level = BT_SECURITY_HIGH;
65668776 1996
49c922bb 1997 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1998 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1999 u8 method;
2000
2001 method = get_auth_method(smp, req->io_capability,
2002 rsp->io_capability);
2003 if (method == JUST_WORKS || method == JUST_CFM)
2004 return SMP_AUTH_REQUIREMENTS;
2005 }
2006
e84a6b13 2007 get_random_bytes(smp->prnd, sizeof(smp->prnd));
7d24ddcc 2008
fdcc4bec
JH		 2009 /* Update remote key distribution in case the remote cleared
2010 * some bits that we had enabled in our request.
2011 */
2012 smp->remote_key_dist &= rsp->resp_key_dist;
2013
3b19146d
JH		 2014 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2015 /* Clear bits which are generated but not distributed */
2016 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
2017 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
2018 return sc_send_public_key(smp);
2019 }
2020
c05b9339 2021 auth |= req->auth_req;
2b64d153 2022
476585ec 2023 ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
2b64d153
BG		 2024 if (ret)
2025 return SMP_UNSPECIFIED;
2026
4a74d658 2027 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153
BG		 2028
2029 /* Can't compose response until we have been confirmed */
4a74d658 2030 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2031 return smp_confirm(smp);
da85e5e5
VCG		 2032
2033 return 0;
88ba43b6
AB		 2034}
2035
dcee2b32
JH		 2036static u8 sc_check_confirm(struct smp_chan *smp)
2037{
2038 struct l2cap_conn *conn = smp->conn;
2039
2040 BT_DBG("");
2041
38606f14
JH		 2042 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2043 return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM);
2044
dcee2b32
JH		 2045 if (conn->hcon->out) {
2046 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2047 smp->prnd);
2048 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2049 }
2050
2051 return 0;
2052}
2053
19c5ce9c
JH		 2054/* Work-around for some implementations that incorrectly copy RFU bits
2055 * from our security request and thereby create the impression that
2056 * we're doing SC when in fact the remote doesn't support it.
2057 */
2058static int fixup_sc_false_positive(struct smp_chan *smp)
2059{
2060 struct l2cap_conn *conn = smp->conn;
2061 struct hci_conn *hcon = conn->hcon;
2062 struct hci_dev *hdev = hcon->hdev;
2063 struct smp_cmd_pairing *req, *rsp;
2064 u8 auth;
2065
2066 /* The issue is only observed when we're in slave role */
2067 if (hcon->out)
2068 return SMP_UNSPECIFIED;
2069
2070 if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) {
2064ee33 2071 bt_dev_err(hdev, "refusing legacy fallback in SC-only mode");
19c5ce9c
JH		 2072 return SMP_UNSPECIFIED;
2073 }
2074
2064ee33 2075 bt_dev_err(hdev, "trying to fall back to legacy SMP");
19c5ce9c
JH		 2076
2077 req = (void *) &smp->preq[1];
2078 rsp = (void *) &smp->prsp[1];
2079
2080 /* Rebuild key dist flags which may have been cleared for SC */
2081 smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist);
2082
2083 auth = req->auth_req & AUTH_REQ_MASK(hdev);
2084
2085 if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) {
2064ee33 2086 bt_dev_err(hdev, "failed to fall back to legacy SMP");
19c5ce9c
JH		 2087 return SMP_UNSPECIFIED;
2088 }
2089
2090 clear_bit(SMP_FLAG_SC, &smp->flags);
2091
2092 return 0;
2093}
2094
da85e5e5 2095static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2096{
5d88cc73
JH		 2097 struct l2cap_chan *chan = conn->smp;
2098 struct smp_chan *smp = chan->data;
7d24ddcc 2099
88ba43b6
AB		 2100 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
2101
c46b98be 2102 if (skb->len < sizeof(smp->pcnf))
38e4a915 2103 return SMP_INVALID_PARAMS;
c46b98be 2104
1c1def09
VCG		 2105 memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
2106 skb_pull(skb, sizeof(smp->pcnf));
88ba43b6 2107
19c5ce9c
JH		 2108 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2109 int ret;
2110
2111 /* Public Key exchange must happen before any other steps */
2112 if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags))
2113 return sc_check_confirm(smp);
2114
2115 BT_ERR("Unexpected SMP Pairing Confirm");
2116
2117 ret = fixup_sc_false_positive(smp);
2118 if (ret)
2119 return ret;
2120 }
dcee2b32 2121
b28b4943 2122 if (conn->hcon->out) {
943a732a
JH		 2123 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2124 smp->prnd);
b28b4943
JH		 2125 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2126 return 0;
2127 }
2128
2129 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2130 return smp_confirm(smp);
983f9814
MH		 2131
2132 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
da85e5e5
VCG		 2133
2134 return 0;
88ba43b6
AB		 2135}
2136
da85e5e5 2137static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2138{
5d88cc73
JH		 2139 struct l2cap_chan *chan = conn->smp;
2140 struct smp_chan *smp = chan->data;
191dc7fe
JH		 2141 struct hci_conn *hcon = conn->hcon;
2142 u8 *pkax, *pkbx, *na, *nb;
2143 u32 passkey;
2144 int err;
7d24ddcc 2145
8aab4757 2146 BT_DBG("conn %p", conn);
3158c50c 2147
c46b98be 2148 if (skb->len < sizeof(smp->rrnd))
38e4a915 2149 return SMP_INVALID_PARAMS;
c46b98be 2150
943a732a 2151 memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
8aab4757 2152 skb_pull(skb, sizeof(smp->rrnd));
e7e62c85 2153
191dc7fe
JH		 2154 if (!test_bit(SMP_FLAG_SC, &smp->flags))
2155 return smp_random(smp);
2156
580039e8
JH		 2157 if (hcon->out) {
2158 pkax = smp->local_pk;
2159 pkbx = smp->remote_pk;
2160 na = smp->prnd;
2161 nb = smp->rrnd;
2162 } else {
2163 pkax = smp->remote_pk;
2164 pkbx = smp->local_pk;
2165 na = smp->rrnd;
2166 nb = smp->prnd;
2167 }
2168
a29b0733
JH		 2169 if (smp->method == REQ_OOB) {
2170 if (!hcon->out)
2171 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2172 sizeof(smp->prnd), smp->prnd);
2173 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2174 goto mackey_and_ltk;
2175 }
2176
38606f14
JH		 2177 /* Passkey entry has special treatment */
2178 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2179 return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
2180
191dc7fe
JH		 2181 if (hcon->out) {
2182 u8 cfm[16];
2183
2184 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
2185 smp->rrnd, 0, cfm);
2186 if (err)
2187 return SMP_UNSPECIFIED;
2188
329d8230 2189 if (crypto_memneq(smp->pcnf, cfm, 16))
191dc7fe 2190 return SMP_CONFIRM_FAILED;
191dc7fe
JH		 2191 } else {
2192 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2193 smp->prnd);
2194 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
191dc7fe
JH		 2195 }
2196
a29b0733 2197mackey_and_ltk:
760b018b
JH		 2198 /* Generate MacKey and LTK */
2199 err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
2200 if (err)
2201 return SMP_UNSPECIFIED;
2202
a29b0733 2203 if (smp->method == JUST_WORKS || smp->method == REQ_OOB) {
dddd3059 2204 if (hcon->out) {
38606f14 2205 sc_dhkey_check(smp);
dddd3059
JH		 2206 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2207 }
2208 return 0;
2209 }
2210
38606f14
JH		 2211 err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
2212 if (err)
2213 return SMP_UNSPECIFIED;
2214
2215 err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type,
2216 hcon->dst_type, passkey, 0);
191dc7fe
JH		 2217 if (err)
2218 return SMP_UNSPECIFIED;
2219
38606f14
JH		 2220 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2221
191dc7fe 2222 return 0;
88ba43b6
AB		 2223}
2224
f81cd823 2225static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
988c5997 2226{
c9839a11 2227 struct smp_ltk *key;
988c5997
VCG		 2228 struct hci_conn *hcon = conn->hcon;
2229
f3a73d97 2230 key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role);
988c5997 2231 if (!key)
f81cd823 2232 return false;
988c5997 2233
a6f7833c 2234 if (smp_ltk_sec_level(key) < sec_level)
f81cd823 2235 return false;
4dab7864 2236
51a8efd7 2237 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
f81cd823 2238 return true;
988c5997 2239
8b76ce34 2240 hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size);
c9839a11 2241 hcon->enc_key_size = key->enc_size;
988c5997 2242
fe59a05f
JH		 2243 /* We never store STKs for master role, so clear this flag */
2244 clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
2245
f81cd823 2246 return true;
988c5997 2247}
f1560463 2248
35dc6f83
JH		 2249bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
2250 enum smp_key_pref key_pref)
854f4727
JH		 2251{
2252 if (sec_level == BT_SECURITY_LOW)
2253 return true;
2254
35dc6f83
JH		 2255 /* If we're encrypted with an STK but the caller prefers using
2256 * LTK claim insufficient security. This way we allow the
2257 * connection to be re-encrypted with an LTK, even if the LTK
2258 * provides the same level of security. Only exception is if we
2259 * don't have an LTK (e.g. because of key distribution bits).
9ab65d60 2260 */
35dc6f83
JH		 2261 if (key_pref == SMP_USE_LTK &&
2262 test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
f3a73d97 2263 hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role))
9ab65d60
JH		 2264 return false;
2265
854f4727
JH		 2266 if (hcon->sec_level >= sec_level)
2267 return true;
2268
2269 return false;
2270}
2271
da85e5e5 2272static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6
AB		 2273{
2274 struct smp_cmd_security_req *rp = (void *) skb->data;
2275 struct smp_cmd_pairing cp;
f1cb9af5 2276 struct hci_conn *hcon = conn->hcon;
0edb14de 2277 struct hci_dev *hdev = hcon->hdev;
8aab4757 2278 struct smp_chan *smp;
c05b9339 2279 u8 sec_level, auth;
88ba43b6
AB		 2280
2281 BT_DBG("conn %p", conn);
2282
c46b98be 2283 if (skb->len < sizeof(*rp))
38e4a915 2284 return SMP_INVALID_PARAMS;
c46b98be 2285
40bef302 2286 if (hcon->role != HCI_ROLE_MASTER)
86ca9eac
JH		 2287 return SMP_CMD_NOTSUPP;
2288
0edb14de 2289 auth = rp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 2290
d7a5a11d 2291 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 2292 return SMP_AUTH_REQUIREMENTS;
2293
5be5e275 2294 if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 2295 sec_level = BT_SECURITY_MEDIUM;
2296 else
2297 sec_level = authreq_to_seclevel(auth);
2298
c1567ad0
SJ		 2299 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) {
2300 /* If link is already encrypted with sufficient security we
2301 * still need refresh encryption as per Core Spec 5.0 Vol 3,
2302 * Part H 2.4.6
2303 */
2304 smp_ltk_encrypt(conn, hcon->sec_level);
854f4727 2305 return 0;
c1567ad0 2306 }
854f4727 2307
c7262e71
JH		 2308 if (sec_level > hcon->pending_sec_level)
2309 hcon->pending_sec_level = sec_level;
feb45eb5 2310
4dab7864 2311 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
988c5997
VCG		 2312 return 0;
2313
8aab4757 2314 smp = smp_chan_create(conn);
c29d2444
JH		 2315 if (!smp)
2316 return SMP_UNSPECIFIED;
d26a2345 2317
d7a5a11d 2318 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 2319 (auth & SMP_AUTH_BONDING))
616d55be
JH		 2320 return SMP_PAIRING_NOTSUPP;
2321
88ba43b6 2322 skb_pull(skb, sizeof(*rp));
88ba43b6 2323
da85e5e5 2324 memset(&cp, 0, sizeof(cp));
c05b9339 2325 build_pairing_cmd(conn, &cp, NULL, auth);
88ba43b6 2326
1c1def09
VCG		 2327 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2328 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2329
88ba43b6 2330 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2331 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
f1cb9af5 2332
da85e5e5 2333 return 0;
88ba43b6
AB		 2334}
2335
cc110922 2336int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
eb492e01 2337{
cc110922 2338 struct l2cap_conn *conn = hcon->l2cap_data;
c68b7f12 2339 struct l2cap_chan *chan;
0a66cf20 2340 struct smp_chan *smp;
2b64d153 2341 __u8 authreq;
fc75cc86 2342 int ret;
eb492e01 2343
3a0259bb
VCG		 2344 BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
2345
0a66cf20
JH		 2346 /* This may be NULL if there's an unexpected disconnection */
2347 if (!conn)
2348 return 1;
2349
d7a5a11d 2350 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED))
2e65c9d2
AG		 2351 return 1;
2352
35dc6f83 2353 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
eb492e01 2354 return 1;
f1cb9af5 2355
c7262e71
JH		 2356 if (sec_level > hcon->pending_sec_level)
2357 hcon->pending_sec_level = sec_level;
2358
40bef302 2359 if (hcon->role == HCI_ROLE_MASTER)
c7262e71
JH		 2360 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
2361 return 0;
d26a2345 2362
d8949aad
JH		 2363 chan = conn->smp;
2364 if (!chan) {
2064ee33 2365 bt_dev_err(hcon->hdev, "security requested but not available");
d8949aad
JH		 2366 return 1;
2367 }
2368
fc75cc86
JH		 2369 l2cap_chan_lock(chan);
2370
2371 /* If SMP is already in progress ignore this request */
2372 if (chan->data) {
2373 ret = 0;
2374 goto unlock;
2375 }
d26a2345 2376
8aab4757 2377 smp = smp_chan_create(conn);
fc75cc86
JH		 2378 if (!smp) {
2379 ret = 1;
2380 goto unlock;
2381 }
2b64d153
BG		 2382
2383 authreq = seclevel_to_authreq(sec_level);
d26a2345 2384
a62da6f1 2385 if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) {
d2eb9e10 2386 authreq |= SMP_AUTH_SC;
a62da6f1
JH		 2387 if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED))
2388 authreq |= SMP_AUTH_CT2;
2389 }
d2eb9e10 2390
79897d20
JH		 2391 /* Require MITM if IO Capability allows or the security level
2392 * requires it.
2e233644 2393 */
79897d20 2394 if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
c7262e71 2395 hcon->pending_sec_level > BT_SECURITY_MEDIUM)
2e233644
JH		 2396 authreq |= SMP_AUTH_MITM;
2397
40bef302 2398 if (hcon->role == HCI_ROLE_MASTER) {
d26a2345 2399 struct smp_cmd_pairing cp;
f01ead31 2400
2b64d153 2401 build_pairing_cmd(conn, &cp, NULL, authreq);
1c1def09
VCG		 2402 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2403 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2404
eb492e01 2405 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2406 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
eb492e01
AB		 2407 } else {
2408 struct smp_cmd_security_req cp;
2b64d153 2409 cp.auth_req = authreq;
eb492e01 2410 smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
b28b4943 2411 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ);
eb492e01
AB		 2412 }
2413
4a74d658 2414 set_bit(SMP_FLAG_INITIATOR, &smp->flags);
fc75cc86 2415 ret = 0;
edca792c 2416
fc75cc86
JH		 2417unlock:
2418 l2cap_chan_unlock(chan);
2419 return ret;
eb492e01
AB		 2420}
2421
c81d555a
JH		 2422void smp_cancel_pairing(struct hci_conn *hcon)
2423{
2424 struct l2cap_conn *conn = hcon->l2cap_data;
2425 struct l2cap_chan *chan;
2426 struct smp_chan *smp;
2427
2428 if (!conn)
2429 return;
2430
2431 chan = conn->smp;
2432 if (!chan)
2433 return;
2434
2435 l2cap_chan_lock(chan);
2436
2437 smp = chan->data;
2438 if (smp) {
2439 if (test_bit(SMP_FLAG_COMPLETE, &smp->flags))
2440 smp_failure(conn, 0);
2441 else
2442 smp_failure(conn, SMP_UNSPECIFIED);
2443 }
2444
2445 l2cap_chan_unlock(chan);
2446}
2447
7034b911
VCG		 2448static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
2449{
16b90839 2450 struct smp_cmd_encrypt_info *rp = (void *) skb->data;
5d88cc73
JH		 2451 struct l2cap_chan *chan = conn->smp;
2452 struct smp_chan *smp = chan->data;
16b90839 2453
c46b98be
JH		 2454 BT_DBG("conn %p", conn);
2455
2456 if (skb->len < sizeof(*rp))
38e4a915 2457 return SMP_INVALID_PARAMS;
c46b98be 2458
b28b4943 2459 SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT);
6131ddc8 2460
16b90839
VCG		 2461 skb_pull(skb, sizeof(*rp));
2462
1c1def09 2463 memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
16b90839 2464
7034b911
VCG		 2465 return 0;
2466}
2467
2468static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
2469{
16b90839 2470 struct smp_cmd_master_ident *rp = (void *) skb->data;
5d88cc73
JH		 2471 struct l2cap_chan *chan = conn->smp;
2472 struct smp_chan *smp = chan->data;
c9839a11
VCG		 2473 struct hci_dev *hdev = conn->hcon->hdev;
2474 struct hci_conn *hcon = conn->hcon;
23d0e128 2475 struct smp_ltk *ltk;
c9839a11 2476 u8 authenticated;
16b90839 2477
c46b98be
JH		 2478 BT_DBG("conn %p", conn);
2479
2480 if (skb->len < sizeof(*rp))
38e4a915 2481 return SMP_INVALID_PARAMS;
c46b98be 2482
9747a9f3
JH		 2483 /* Mark the information as received */
2484 smp->remote_key_dist &= ~SMP_DIST_ENC_KEY;
2485
b28b4943
JH		 2486 if (smp->remote_key_dist & SMP_DIST_ID_KEY)
2487 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
196332f5
JH		 2488 else if (smp->remote_key_dist & SMP_DIST_SIGN)
2489 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
b28b4943 2490
16b90839 2491 skb_pull(skb, sizeof(*rp));
7034b911 2492
ce39fb4e 2493 authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
2ceba539 2494 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
23d0e128
JH		 2495 authenticated, smp->tk, smp->enc_key_size,
2496 rp->ediv, rp->rand);
2497 smp->ltk = ltk;
c6e81e9a 2498 if (!(smp->remote_key_dist & KEY_DIST_MASK))
d6268e86 2499 smp_distribute_keys(smp);
7034b911
VCG		 2500
2501 return 0;
2502}
2503
fd349c02
JH		 2504static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
2505{
2506 struct smp_cmd_ident_info *info = (void *) skb->data;
5d88cc73
JH		 2507 struct l2cap_chan *chan = conn->smp;
2508 struct smp_chan *smp = chan->data;
fd349c02
JH		 2509
2510 BT_DBG("");
2511
2512 if (skb->len < sizeof(*info))
38e4a915 2513 return SMP_INVALID_PARAMS;
fd349c02 2514
b28b4943 2515 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO);
6131ddc8 2516
fd349c02
JH		 2517 skb_pull(skb, sizeof(*info));
2518
2519 memcpy(smp->irk, info->irk, 16);
2520
2521 return 0;
2522}
2523
2524static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
2525 struct sk_buff *skb)
2526{
2527 struct smp_cmd_ident_addr_info *info = (void *) skb->data;
5d88cc73
JH		 2528 struct l2cap_chan *chan = conn->smp;
2529 struct smp_chan *smp = chan->data;
fd349c02
JH		 2530 struct hci_conn *hcon = conn->hcon;
2531 bdaddr_t rpa;
2532
2533 BT_DBG("");
2534
2535 if (skb->len < sizeof(*info))
38e4a915 2536 return SMP_INVALID_PARAMS;
fd349c02 2537
9747a9f3
JH		 2538 /* Mark the information as received */
2539 smp->remote_key_dist &= ~SMP_DIST_ID_KEY;
2540
b28b4943
JH		 2541 if (smp->remote_key_dist & SMP_DIST_SIGN)
2542 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
2543
fd349c02
JH		 2544 skb_pull(skb, sizeof(*info));
2545
a9a58f86
JH		 2546 /* Strictly speaking the Core Specification (4.1) allows sending
2547 * an empty address which would force us to rely on just the IRK
2548 * as "identity information". However, since such
2549 * implementations are not known of and in order to not over
2550 * complicate our implementation, simply pretend that we never
2551 * received an IRK for such a device.
e12af489
JH		 2552 *
2553 * The Identity Address must also be a Static Random or Public
2554 * Address, which hci_is_identity_address() checks for.
a9a58f86 2555 */
e12af489
JH		 2556 if (!bacmp(&info->bdaddr, BDADDR_ANY) ||
2557 !hci_is_identity_address(&info->bdaddr, info->addr_type)) {
2064ee33 2558 bt_dev_err(hcon->hdev, "ignoring IRK with no identity address");
31dd624e 2559 goto distribute;
a9a58f86
JH		 2560 }
2561
fd349c02
JH		 2562 bacpy(&smp->id_addr, &info->bdaddr);
2563 smp->id_addr_type = info->addr_type;
2564
2565 if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type))
2566 bacpy(&rpa, &hcon->dst);
2567 else
2568 bacpy(&rpa, BDADDR_ANY);
2569
23d0e128
JH		 2570 smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr,
2571 smp->id_addr_type, smp->irk, &rpa);
fd349c02 2572
31dd624e 2573distribute:
c6e81e9a
JH		 2574 if (!(smp->remote_key_dist & KEY_DIST_MASK))
2575 smp_distribute_keys(smp);
fd349c02
JH		 2576
2577 return 0;
2578}
2579
7ee4ea36
MH		 2580static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
2581{
2582 struct smp_cmd_sign_info *rp = (void *) skb->data;
5d88cc73
JH		 2583 struct l2cap_chan *chan = conn->smp;
2584 struct smp_chan *smp = chan->data;
7ee4ea36
MH		 2585 struct smp_csrk *csrk;
2586
2587 BT_DBG("conn %p", conn);
2588
2589 if (skb->len < sizeof(*rp))
38e4a915 2590 return SMP_INVALID_PARAMS;
7ee4ea36 2591
7ee4ea36
MH		 2592 /* Mark the information as received */
2593 smp->remote_key_dist &= ~SMP_DIST_SIGN;
2594
2595 skb_pull(skb, sizeof(*rp));
2596
7ee4ea36
MH		 2597 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
2598 if (csrk) {
4cd3928a
JH		 2599 if (conn->hcon->sec_level > BT_SECURITY_MEDIUM)
2600 csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED;
2601 else
2602 csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED;
7ee4ea36
MH		 2603 memcpy(csrk->val, rp->csrk, sizeof(csrk->val));
2604 }
2605 smp->csrk = csrk;
d6268e86 2606 smp_distribute_keys(smp);
7ee4ea36
MH		 2607
2608 return 0;
2609}
2610
5e3d3d9b
JH		 2611static u8 sc_select_method(struct smp_chan *smp)
2612{
2613 struct l2cap_conn *conn = smp->conn;
2614 struct hci_conn *hcon = conn->hcon;
2615 struct smp_cmd_pairing *local, *remote;
2616 u8 local_mitm, remote_mitm, local_io, remote_io, method;
2617
1a8bab4f
JH		 2618 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) ||
2619 test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags))
a29b0733
JH		 2620 return REQ_OOB;
2621
5e3d3d9b
JH		 2622 /* The preq/prsp contain the raw Pairing Request/Response PDUs
2623 * which are needed as inputs to some crypto functions. To get
2624 * the "struct smp_cmd_pairing" from them we need to skip the
2625 * first byte which contains the opcode.
2626 */
2627 if (hcon->out) {
2628 local = (void *) &smp->preq[1];
2629 remote = (void *) &smp->prsp[1];
2630 } else {
2631 local = (void *) &smp->prsp[1];
2632 remote = (void *) &smp->preq[1];
2633 }
2634
2635 local_io = local->io_capability;
2636 remote_io = remote->io_capability;
2637
2638 local_mitm = (local->auth_req & SMP_AUTH_MITM);
2639 remote_mitm = (remote->auth_req & SMP_AUTH_MITM);
2640
2641 /* If either side wants MITM, look up the method from the table,
2642 * otherwise use JUST WORKS.
2643 */
2644 if (local_mitm || remote_mitm)
2645 method = get_auth_method(smp, local_io, remote_io);
2646 else
2647 method = JUST_WORKS;
2648
2649 /* Don't confirm locally initiated pairing attempts */
2650 if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
2651 method = JUST_WORKS;
2652
2653 return method;
2654}
2655
d8f8edbe
JH		 2656static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
2657{
2658 struct smp_cmd_public_key *key = (void *) skb->data;
2659 struct hci_conn *hcon = conn->hcon;
2660 struct l2cap_chan *chan = conn->smp;
2661 struct smp_chan *smp = chan->data;
5e3d3d9b 2662 struct hci_dev *hdev = hcon->hdev;
c0153b0b 2663 struct crypto_kpp *tfm_ecdh;
cbbbe3e2 2664 struct smp_cmd_pairing_confirm cfm;
d8f8edbe
JH		 2665 int err;
2666
2667 BT_DBG("conn %p", conn);
2668
2669 if (skb->len < sizeof(*key))
2670 return SMP_INVALID_PARAMS;
2671
2672 memcpy(smp->remote_pk, key, 64);
2673
a8ca617c
JH		 2674 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {
2675 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
2676 smp->rr, 0, cfm.confirm_val);
2677 if (err)
2678 return SMP_UNSPECIFIED;
2679
329d8230 2680 if (crypto_memneq(cfm.confirm_val, smp->pcnf, 16))
a8ca617c
JH		 2681 return SMP_CONFIRM_FAILED;
2682 }
2683
d8f8edbe
JH		 2684 /* Non-initiating device sends its public key after receiving
2685 * the key from the initiating device.
2686 */
2687 if (!hcon->out) {
2688 err = sc_send_public_key(smp);
2689 if (err)
2690 return err;
2691 }
2692
c7a3d57d 2693 SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk);
e091526d 2694 SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32);
d8f8edbe 2695
c0153b0b
TA		 2696 /* Compute the shared secret on the same crypto tfm on which the private
2697 * key was set/generated.
2698 */
2699 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
2700 struct smp_dev *smp_dev = chan->data;
2701
2702 tfm_ecdh = smp_dev->tfm_ecdh;
2703 } else {
2704 tfm_ecdh = smp->tfm_ecdh;
2705 }
2706
2707 if (compute_ecdh_secret(tfm_ecdh, smp->remote_pk, smp->dhkey))
d8f8edbe
JH		 2708 return SMP_UNSPECIFIED;
2709
c7a3d57d 2710 SMP_DBG("DHKey %32phN", smp->dhkey);
d8f8edbe
JH		 2711
2712 set_bit(SMP_FLAG_REMOTE_PK, &smp->flags);
2713
5e3d3d9b
JH		 2714 smp->method = sc_select_method(smp);
2715
2716 BT_DBG("%s selected method 0x%02x", hdev->name, smp->method);
2717
2718 /* JUST_WORKS and JUST_CFM result in an unauthenticated key */
2719 if (smp->method == JUST_WORKS || smp->method == JUST_CFM)
2720 hcon->pending_sec_level = BT_SECURITY_MEDIUM;
2721 else
2722 hcon->pending_sec_level = BT_SECURITY_FIPS;
2723
329d8230 2724 if (!crypto_memneq(debug_pk, smp->remote_pk, 64))
aeb7d461
JH		 2725 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
2726
38606f14
JH		 2727 if (smp->method == DSP_PASSKEY) {
2728 get_random_bytes(&hcon->passkey_notify,
2729 sizeof(hcon->passkey_notify));
2730 hcon->passkey_notify %= 1000000;
2731 hcon->passkey_entered = 0;
2732 smp->passkey_round = 0;
2733 if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type,
2734 hcon->dst_type,
2735 hcon->passkey_notify,
2736 hcon->passkey_entered))
2737 return SMP_UNSPECIFIED;
2738 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2739 return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
2740 }
2741
94ea7257 2742 if (smp->method == REQ_OOB) {
a29b0733
JH		 2743 if (hcon->out)
2744 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2745 sizeof(smp->prnd), smp->prnd);
2746
2747 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2748
2749 return 0;
2750 }
2751
38606f14
JH		 2752 if (hcon->out)
2753 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2754
2755 if (smp->method == REQ_PASSKEY) {
2756 if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type,
2757 hcon->dst_type))
2758 return SMP_UNSPECIFIED;
2759 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2760 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2761 return 0;
2762 }
2763
cbbbe3e2
JH		 2764 /* The Initiating device waits for the non-initiating device to
2765 * send the confirm value.
2766 */
2767 if (conn->hcon->out)
2768 return 0;
2769
2770 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd,
2771 0, cfm.confirm_val);
2772 if (err)
2773 return SMP_UNSPECIFIED;
2774
2775 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
2776 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2777
d8f8edbe
JH		 2778 return 0;
2779}
2780
6433a9a2
JH		 2781static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb)
2782{
2783 struct smp_cmd_dhkey_check *check = (void *) skb->data;
2784 struct l2cap_chan *chan = conn->smp;
2785 struct hci_conn *hcon = conn->hcon;
2786 struct smp_chan *smp = chan->data;
2787 u8 a[7], b[7], *local_addr, *remote_addr;
2788 u8 io_cap[3], r[16], e[16];
2789 int err;
2790
2791 BT_DBG("conn %p", conn);
2792
2793 if (skb->len < sizeof(*check))
2794 return SMP_INVALID_PARAMS;
2795
2796 memcpy(a, &hcon->init_addr, 6);
2797 memcpy(b, &hcon->resp_addr, 6);
2798 a[6] = hcon->init_addr_type;
2799 b[6] = hcon->resp_addr_type;
2800
2801 if (hcon->out) {
2802 local_addr = a;
2803 remote_addr = b;
2804 memcpy(io_cap, &smp->prsp[1], 3);
2805 } else {
2806 local_addr = b;
2807 remote_addr = a;
2808 memcpy(io_cap, &smp->preq[1], 3);
2809 }
2810
2811 memset(r, 0, sizeof(r));
2812
38606f14
JH		 2813 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2814 put_unaligned_le32(hcon->passkey_notify, r);
882fafad
JH		 2815 else if (smp->method == REQ_OOB)
2816 memcpy(r, smp->lr, 16);
38606f14 2817
6433a9a2
JH		 2818 err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r,
2819 io_cap, remote_addr, local_addr, e);
2820 if (err)
2821 return SMP_UNSPECIFIED;
2822
329d8230 2823 if (crypto_memneq(check->e, e, 16))
6433a9a2
JH		 2824 return SMP_DHKEY_CHECK_FAILED;
2825
d3e54a87
JH		 2826 if (!hcon->out) {
2827 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
2828 set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags);
2829 return 0;
2830 }
d378a2d7 2831
d3e54a87
JH		 2832 /* Slave sends DHKey check as response to master */
2833 sc_dhkey_check(smp);
2834 }
d378a2d7 2835
d3e54a87 2836 sc_add_ltk(smp);
6433a9a2
JH		 2837
2838 if (hcon->out) {
8b76ce34 2839 hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size);
6433a9a2
JH		 2840 hcon->enc_key_size = smp->enc_key_size;
2841 }
2842
2843 return 0;
2844}
2845
1408bb6e
JH		 2846static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
2847 struct sk_buff *skb)
2848{
2849 struct smp_cmd_keypress_notify *kp = (void *) skb->data;
2850
2851 BT_DBG("value 0x%02x", kp->value);
2852
2853 return 0;
2854}
2855
4befb867 2856static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
eb492e01 2857{
5d88cc73 2858 struct l2cap_conn *conn = chan->conn;
7b9899db 2859 struct hci_conn *hcon = conn->hcon;
b28b4943 2860 struct smp_chan *smp;
92381f5c 2861 __u8 code, reason;
eb492e01
AB		 2862 int err = 0;
2863
8ae9b984 2864 if (skb->len < 1)
92381f5c 2865 return -EILSEQ;
92381f5c 2866
d7a5a11d 2867 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) {
2e65c9d2
AG		 2868 reason = SMP_PAIRING_NOTSUPP;
2869 goto done;
2870 }
2871
92381f5c 2872 code = skb->data[0];
eb492e01
AB		 2873 skb_pull(skb, sizeof(code));
2874
b28b4943
JH		 2875 smp = chan->data;
2876
2877 if (code > SMP_CMD_MAX)
2878 goto drop;
2879
24bd0bd9 2880 if (smp && !test_and_clear_bit(code, &smp->allow_cmd))
b28b4943
JH		 2881 goto drop;
2882
2883 /* If we don't have a context the only allowed commands are
2884 * pairing request and security request.
8cf9fa12 2885 */
b28b4943
JH		 2886 if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ)
2887 goto drop;
8cf9fa12 2888
eb492e01
AB		 2889 switch (code) {
2890 case SMP_CMD_PAIRING_REQ:
da85e5e5 2891 reason = smp_cmd_pairing_req(conn, skb);
eb492e01
AB		 2892 break;
2893
2894 case SMP_CMD_PAIRING_FAIL:
84794e11 2895 smp_failure(conn, 0);
da85e5e5 2896 err = -EPERM;
eb492e01
AB		 2897 break;
2898
2899 case SMP_CMD_PAIRING_RSP:
da85e5e5 2900 reason = smp_cmd_pairing_rsp(conn, skb);
88ba43b6
AB		 2901 break;
2902
2903 case SMP_CMD_SECURITY_REQ:
da85e5e5 2904 reason = smp_cmd_security_req(conn, skb);
88ba43b6
AB		 2905 break;
2906
eb492e01 2907 case SMP_CMD_PAIRING_CONFIRM:
da85e5e5 2908 reason = smp_cmd_pairing_confirm(conn, skb);
88ba43b6
AB		 2909 break;
2910
eb492e01 2911 case SMP_CMD_PAIRING_RANDOM:
da85e5e5 2912 reason = smp_cmd_pairing_random(conn, skb);
88ba43b6
AB		 2913 break;
2914
eb492e01 2915 case SMP_CMD_ENCRYPT_INFO:
7034b911
VCG		 2916 reason = smp_cmd_encrypt_info(conn, skb);
2917 break;
2918
eb492e01 2919 case SMP_CMD_MASTER_IDENT:
7034b911
VCG		 2920 reason = smp_cmd_master_ident(conn, skb);
2921 break;
2922
eb492e01 2923 case SMP_CMD_IDENT_INFO:
fd349c02
JH		 2924 reason = smp_cmd_ident_info(conn, skb);
2925 break;
2926
eb492e01 2927 case SMP_CMD_IDENT_ADDR_INFO:
fd349c02
JH		 2928 reason = smp_cmd_ident_addr_info(conn, skb);
2929 break;
2930
eb492e01 2931 case SMP_CMD_SIGN_INFO:
7ee4ea36 2932 reason = smp_cmd_sign_info(conn, skb);
7034b911
VCG		 2933 break;
2934
d8f8edbe
JH		 2935 case SMP_CMD_PUBLIC_KEY:
2936 reason = smp_cmd_public_key(conn, skb);
2937 break;
2938
6433a9a2
JH		 2939 case SMP_CMD_DHKEY_CHECK:
2940 reason = smp_cmd_dhkey_check(conn, skb);
2941 break;
2942
1408bb6e
JH		 2943 case SMP_CMD_KEYPRESS_NOTIFY:
2944 reason = smp_cmd_keypress_notify(conn, skb);
2945 break;
2946
eb492e01
AB		 2947 default:
2948 BT_DBG("Unknown command code 0x%2.2x", code);
eb492e01 2949 reason = SMP_CMD_NOTSUPP;
3a0259bb 2950 goto done;
eb492e01
AB		 2951 }
2952
3a0259bb 2953done:
9b7b18ef
JH		 2954 if (!err) {
2955 if (reason)
2956 smp_failure(conn, reason);
8ae9b984 2957 kfree_skb(skb);
9b7b18ef
JH		 2958 }
2959
eb492e01 2960 return err;
b28b4943
JH		 2961
2962drop:
2064ee33
MH		 2963 bt_dev_err(hcon->hdev, "unexpected SMP command 0x%02x from %pMR",
2964 code, &hcon->dst);
b28b4943
JH		 2965 kfree_skb(skb);
2966 return 0;
eb492e01 2967}
7034b911 2968
70db83c4
JH		 2969static void smp_teardown_cb(struct l2cap_chan *chan, int err)
2970{
2971 struct l2cap_conn *conn = chan->conn;
2972
2973 BT_DBG("chan %p", chan);
2974
fc75cc86 2975 if (chan->data)
5d88cc73 2976 smp_chan_destroy(conn);
5d88cc73 2977
70db83c4
JH		 2978 conn->smp = NULL;
2979 l2cap_chan_put(chan);
2980}
2981
b5ae344d
JH		 2982static void bredr_pairing(struct l2cap_chan *chan)
2983{
2984 struct l2cap_conn *conn = chan->conn;
2985 struct hci_conn *hcon = conn->hcon;
2986 struct hci_dev *hdev = hcon->hdev;
2987 struct smp_cmd_pairing req;
2988 struct smp_chan *smp;
2989
2990 BT_DBG("chan %p", chan);
2991
2992 /* Only new pairings are interesting */
2993 if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags))
2994 return;
2995
2996 /* Don't bother if we're not encrypted */
2997 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
2998 return;
2999
3000 /* Only master may initiate SMP over BR/EDR */
3001 if (hcon->role != HCI_ROLE_MASTER)
3002 return;
3003
3004 /* Secure Connections support must be enabled */
d7a5a11d 3005 if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED))
b5ae344d
JH		 3006 return;
3007
3008 /* BR/EDR must use Secure Connections for SMP */
3009 if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) &&
b7cb93e5 3010 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 3011 return;
3012
3013 /* If our LE support is not enabled don't do anything */
d7a5a11d 3014 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
b5ae344d
JH		 3015 return;
3016
3017 /* Don't bother if remote LE support is not enabled */
3018 if (!lmp_host_le_capable(hcon))
3019 return;
3020
3021 /* Remote must support SMP fixed chan for BR/EDR */
3022 if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR))
3023 return;
3024
3025 /* Don't bother if SMP is already ongoing */
3026 if (chan->data)
3027 return;
3028
3029 smp = smp_chan_create(conn);
3030 if (!smp) {
2064ee33 3031 bt_dev_err(hdev, "unable to create SMP context for BR/EDR");
b5ae344d
JH		 3032 return;
3033 }
3034
3035 set_bit(SMP_FLAG_SC, &smp->flags);
3036
3037 BT_DBG("%s starting SMP over BR/EDR", hdev->name);
3038
3039 /* Prepare and send the BR/EDR SMP Pairing Request */
3040 build_bredr_pairing_cmd(smp, &req, NULL);
3041
3042 smp->preq[0] = SMP_CMD_PAIRING_REQ;
3043 memcpy(&smp->preq[1], &req, sizeof(req));
3044
3045 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req);
3046 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
3047}
3048
44f1a7ab
JH		 3049static void smp_resume_cb(struct l2cap_chan *chan)
3050{
b68fda68 3051 struct smp_chan *smp = chan->data;
44f1a7ab
JH		 3052 struct l2cap_conn *conn = chan->conn;
3053 struct hci_conn *hcon = conn->hcon;
3054
3055 BT_DBG("chan %p", chan);
3056
b5ae344d
JH		 3057 if (hcon->type == ACL_LINK) {
3058 bredr_pairing(chan);
ef8efe4b 3059 return;
b5ae344d 3060 }
ef8efe4b 3061
86d1407c
JH		 3062 if (!smp)
3063 return;
b68fda68 3064
84bc0db5
JH		 3065 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3066 return;
3067
86d1407c
JH		 3068 cancel_delayed_work(&smp->security_timer);
3069
d6268e86 3070 smp_distribute_keys(smp);
44f1a7ab
JH		 3071}
3072
70db83c4
JH		 3073static void smp_ready_cb(struct l2cap_chan *chan)
3074{
3075 struct l2cap_conn *conn = chan->conn;
b5ae344d 3076 struct hci_conn *hcon = conn->hcon;
70db83c4
JH		 3077
3078 BT_DBG("chan %p", chan);
3079
7883746b
JH		 3080 /* No need to call l2cap_chan_hold() here since we already own
3081 * the reference taken in smp_new_conn_cb(). This is just the
3082 * first time that we tie it to a specific pointer. The code in
3083 * l2cap_core.c ensures that there's no risk this function wont
3084 * get called if smp_new_conn_cb was previously called.
3085 */
70db83c4 3086 conn->smp = chan;
b5ae344d
JH		 3087
3088 if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3089 bredr_pairing(chan);
70db83c4
JH		 3090}
3091
4befb867
JH		 3092static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
3093{
3094 int err;
3095
3096 BT_DBG("chan %p", chan);
3097
3098 err = smp_sig_channel(chan, skb);
3099 if (err) {
b68fda68 3100 struct smp_chan *smp = chan->data;
4befb867 3101
b68fda68
JH		 3102 if (smp)
3103 cancel_delayed_work_sync(&smp->security_timer);
4befb867 3104
1e91c29e 3105 hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);
4befb867
JH		 3106 }
3107
3108 return err;
3109}
3110
70db83c4
JH		 3111static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan,
3112 unsigned long hdr_len,
3113 unsigned long len, int nb)
3114{
3115 struct sk_buff *skb;
3116
3117 skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
3118 if (!skb)
3119 return ERR_PTR(-ENOMEM);
3120
3121 skb->priority = HCI_PRIO_MAX;
a4368ff3 3122 bt_cb(skb)->l2cap.chan = chan;
70db83c4
JH		 3123
3124 return skb;
3125}
3126
3127static const struct l2cap_ops smp_chan_ops = {
3128 .name = "Security Manager",
3129 .ready = smp_ready_cb,
5d88cc73 3130 .recv = smp_recv_cb,
70db83c4
JH		 3131 .alloc_skb = smp_alloc_skb_cb,
3132 .teardown = smp_teardown_cb,
44f1a7ab 3133 .resume = smp_resume_cb,
70db83c4
JH		 3134
3135 .new_connection = l2cap_chan_no_new_connection,
70db83c4
JH		 3136 .state_change = l2cap_chan_no_state_change,
3137 .close = l2cap_chan_no_close,
3138 .defer = l2cap_chan_no_defer,
3139 .suspend = l2cap_chan_no_suspend,
70db83c4
JH		 3140 .set_shutdown = l2cap_chan_no_set_shutdown,
3141 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3142};
3143
3144static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan)
3145{
3146 struct l2cap_chan *chan;
3147
3148 BT_DBG("pchan %p", pchan);
3149
3150 chan = l2cap_chan_create();
3151 if (!chan)
3152 return NULL;
3153
3154 chan->chan_type = pchan->chan_type;
3155 chan->ops = &smp_chan_ops;
3156 chan->scid = pchan->scid;
3157 chan->dcid = chan->scid;
3158 chan->imtu = pchan->imtu;
3159 chan->omtu = pchan->omtu;
3160 chan->mode = pchan->mode;
3161
abe84903
JH		 3162 /* Other L2CAP channels may request SMP routines in order to
3163 * change the security level. This means that the SMP channel
3164 * lock must be considered in its own category to avoid lockdep
3165 * warnings.
3166 */
3167 atomic_set(&chan->nesting, L2CAP_NESTING_SMP);
3168
70db83c4
JH		 3169 BT_DBG("created chan %p", chan);
3170
3171 return chan;
3172}
3173
3174static const struct l2cap_ops smp_root_chan_ops = {
3175 .name = "Security Manager Root",
3176 .new_connection = smp_new_conn_cb,
3177
3178 /* None of these are implemented for the root channel */
3179 .close = l2cap_chan_no_close,
3180 .alloc_skb = l2cap_chan_no_alloc_skb,
3181 .recv = l2cap_chan_no_recv,
3182 .state_change = l2cap_chan_no_state_change,
3183 .teardown = l2cap_chan_no_teardown,
3184 .ready = l2cap_chan_no_ready,
3185 .defer = l2cap_chan_no_defer,
3186 .suspend = l2cap_chan_no_suspend,
3187 .resume = l2cap_chan_no_resume,
3188 .set_shutdown = l2cap_chan_no_set_shutdown,
3189 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3190};
3191
ef8efe4b 3192static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
711eafe3 3193{
70db83c4 3194 struct l2cap_chan *chan;
88a479d9 3195 struct smp_dev *smp;
a4770e11 3196 struct crypto_cipher *tfm_aes;
71af2f6b 3197 struct crypto_shash *tfm_cmac;
47eb2ac8 3198 struct crypto_kpp *tfm_ecdh;
70db83c4 3199
ef8efe4b 3200 if (cid == L2CAP_CID_SMP_BREDR) {
88a479d9 3201 smp = NULL;
ef8efe4b
JH		 3202 goto create_chan;
3203 }
711eafe3 3204
88a479d9
MH		 3205 smp = kzalloc(sizeof(*smp), GFP_KERNEL);
3206 if (!smp)
3207 return ERR_PTR(-ENOMEM);
3208
a4770e11 3209 tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
defce9e8 3210 if (IS_ERR(tfm_aes)) {
a4770e11 3211 BT_ERR("Unable to create AES crypto context");
88a479d9 3212 kzfree(smp);
fe700771 3213 return ERR_CAST(tfm_aes);
711eafe3
JH		 3214 }
3215
71af2f6b 3216 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
6e2dc6d1
MH		 3217 if (IS_ERR(tfm_cmac)) {
3218 BT_ERR("Unable to create CMAC crypto context");
a4770e11 3219 crypto_free_cipher(tfm_aes);
6e2dc6d1
MH		 3220 kzfree(smp);
3221 return ERR_CAST(tfm_cmac);
3222 }
3223
47eb2ac8
TA		 3224 tfm_ecdh = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0);
3225 if (IS_ERR(tfm_ecdh)) {
3226 BT_ERR("Unable to create ECDH crypto context");
3227 crypto_free_shash(tfm_cmac);
3228 crypto_free_cipher(tfm_aes);
3229 kzfree(smp);
3230 return ERR_CAST(tfm_ecdh);
3231 }
3232
88a479d9 3233 smp->tfm_aes = tfm_aes;
6e2dc6d1 3234 smp->tfm_cmac = tfm_cmac;
47eb2ac8 3235 smp->tfm_ecdh = tfm_ecdh;
b1f663c9 3236 smp->min_key_size = SMP_MIN_ENC_KEY_SIZE;
2fd36558 3237 smp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
88a479d9 3238
ef8efe4b 3239create_chan:
70db83c4
JH		 3240 chan = l2cap_chan_create();
3241 if (!chan) {
63511f6d 3242 if (smp) {
a4770e11 3243 crypto_free_cipher(smp->tfm_aes);
71af2f6b 3244 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 3245 crypto_free_kpp(smp->tfm_ecdh);
63511f6d
MH		 3246 kzfree(smp);
3247 }
ef8efe4b 3248 return ERR_PTR(-ENOMEM);
70db83c4
JH		 3249 }
3250
88a479d9 3251 chan->data = smp;
defce9e8 3252
ef8efe4b 3253 l2cap_add_scid(chan, cid);
70db83c4
JH		 3254
3255 l2cap_chan_set_defaults(chan);
3256
157029ba 3257 if (cid == L2CAP_CID_SMP) {
39e3e744
JH		 3258 u8 bdaddr_type;
3259
3260 hci_copy_identity_address(hdev, &chan->src, &bdaddr_type);
3261
3262 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
157029ba 3263 chan->src_type = BDADDR_LE_PUBLIC;
39e3e744
JH		 3264 else
3265 chan->src_type = BDADDR_LE_RANDOM;
157029ba
MH		 3266 } else {
3267 bacpy(&chan->src, &hdev->bdaddr);
ef8efe4b 3268 chan->src_type = BDADDR_BREDR;
157029ba
MH		 3269 }
3270
70db83c4
JH		 3271 chan->state = BT_LISTEN;
3272 chan->mode = L2CAP_MODE_BASIC;
3273 chan->imtu = L2CAP_DEFAULT_MTU;
3274 chan->ops = &smp_root_chan_ops;
3275
abe84903
JH		 3276 /* Set correct nesting level for a parent/listening channel */
3277 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
3278
ef8efe4b 3279 return chan;
711eafe3
JH		 3280}
3281
ef8efe4b 3282static void smp_del_chan(struct l2cap_chan *chan)
711eafe3 3283{
88a479d9 3284 struct smp_dev *smp;
70db83c4 3285
ef8efe4b 3286 BT_DBG("chan %p", chan);
711eafe3 3287
88a479d9
MH		 3288 smp = chan->data;
3289 if (smp) {
defce9e8 3290 chan->data = NULL;
a4770e11 3291 crypto_free_cipher(smp->tfm_aes);
71af2f6b 3292 crypto_free_shash(smp->tfm_cmac);
47eb2ac8 3293 crypto_free_kpp(smp->tfm_ecdh);
88a479d9 3294 kzfree(smp);
711eafe3 3295 }
70db83c4 3296
70db83c4 3297 l2cap_chan_put(chan);
711eafe3 3298}
ef8efe4b 3299
300acfde
MH		 3300static ssize_t force_bredr_smp_read(struct file *file,
3301 char __user *user_buf,
3302 size_t count, loff_t *ppos)
3303{
3304 struct hci_dev *hdev = file->private_data;
3305 char buf[3];
3306
b7cb93e5 3307 buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N';
300acfde
MH		 3308 buf[1] = '\n';
3309 buf[2] = '\0';
3310 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
3311}
3312
3313static ssize_t force_bredr_smp_write(struct file *file,
3314 const char __user *user_buf,
3315 size_t count, loff_t *ppos)
3316{
3317 struct hci_dev *hdev = file->private_data;
3318 char buf[32];
3319 size_t buf_size = min(count, (sizeof(buf)-1));
3320 bool enable;
3321
3322 if (copy_from_user(buf, user_buf, buf_size))
3323 return -EFAULT;
3324
3325 buf[buf_size] = '\0';
3326 if (strtobool(buf, &enable))
3327 return -EINVAL;
3328
b7cb93e5 3329 if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
300acfde
MH		 3330 return -EALREADY;
3331
3332 if (enable) {
3333 struct l2cap_chan *chan;
3334
3335 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3336 if (IS_ERR(chan))
3337 return PTR_ERR(chan);
3338
3339 hdev->smp_bredr_data = chan;
3340 } else {
3341 struct l2cap_chan *chan;
3342
3343 chan = hdev->smp_bredr_data;
3344 hdev->smp_bredr_data = NULL;
3345 smp_del_chan(chan);
3346 }
3347
b7cb93e5 3348 hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
300acfde
MH		 3349
3350 return count;
3351}
3352
3353static const struct file_operations force_bredr_smp_fops = {
3354 .open = simple_open,
3355 .read = force_bredr_smp_read,
3356 .write = force_bredr_smp_write,
3357 .llseek = default_llseek,
3358};
3359
b1f663c9
JH		 3360static ssize_t le_min_key_size_read(struct file *file,
3361 char __user *user_buf,
3362 size_t count, loff_t *ppos)
3363{
3364 struct hci_dev *hdev = file->private_data;
3365 char buf[4];
3366
3367 snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size);
3368
3369 return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
3370}
3371
3372static ssize_t le_min_key_size_write(struct file *file,
3373 const char __user *user_buf,
3374 size_t count, loff_t *ppos)
3375{
3376 struct hci_dev *hdev = file->private_data;
3377 char buf[32];
3378 size_t buf_size = min(count, (sizeof(buf) - 1));
3379 u8 key_size;
3380
3381 if (copy_from_user(buf, user_buf, buf_size))
3382 return -EFAULT;
3383
3384 buf[buf_size] = '\0';
3385
3386 sscanf(buf, "%hhu", &key_size);
3387
3388 if (key_size > SMP_DEV(hdev)->max_key_size ||
3389 key_size < SMP_MIN_ENC_KEY_SIZE)
3390 return -EINVAL;
3391
3392 SMP_DEV(hdev)->min_key_size = key_size;
3393
3394 return count;
3395}
3396
3397static const struct file_operations le_min_key_size_fops = {
3398 .open = simple_open,
3399 .read = le_min_key_size_read,
3400 .write = le_min_key_size_write,
3401 .llseek = default_llseek,
3402};
3403
2fd36558
JH		 3404static ssize_t le_max_key_size_read(struct file *file,
3405 char __user *user_buf,
3406 size_t count, loff_t *ppos)
3407{
3408 struct hci_dev *hdev = file->private_data;
3409 char buf[4];
3410
3411 snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->max_key_size);
3412
3413 return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
3414}
3415
3416static ssize_t le_max_key_size_write(struct file *file,
3417 const char __user *user_buf,
3418 size_t count, loff_t *ppos)
3419{
3420 struct hci_dev *hdev = file->private_data;
3421 char buf[32];
3422 size_t buf_size = min(count, (sizeof(buf) - 1));
3423 u8 key_size;
3424
3425 if (copy_from_user(buf, user_buf, buf_size))
3426 return -EFAULT;
3427
3428 buf[buf_size] = '\0';
3429
3430 sscanf(buf, "%hhu", &key_size);
3431
b1f663c9
JH		 3432 if (key_size > SMP_MAX_ENC_KEY_SIZE ||
3433 key_size < SMP_DEV(hdev)->min_key_size)
2fd36558
JH		 3434 return -EINVAL;
3435
3436 SMP_DEV(hdev)->max_key_size = key_size;
3437
3438 return count;
3439}
3440
3441static const struct file_operations le_max_key_size_fops = {
3442 .open = simple_open,
3443 .read = le_max_key_size_read,
3444 .write = le_max_key_size_write,
3445 .llseek = default_llseek,
3446};
3447
ef8efe4b
JH		 3448int smp_register(struct hci_dev *hdev)
3449{
3450 struct l2cap_chan *chan;
3451
3452 BT_DBG("%s", hdev->name);
3453
7e7ec445
MH		 3454 /* If the controller does not support Low Energy operation, then
3455 * there is also no need to register any SMP channel.
3456 */
3457 if (!lmp_le_capable(hdev))
3458 return 0;
3459
2b8df323
MH		 3460 if (WARN_ON(hdev->smp_data)) {
3461 chan = hdev->smp_data;
3462 hdev->smp_data = NULL;
3463 smp_del_chan(chan);
3464 }
3465
ef8efe4b
JH		 3466 chan = smp_add_cid(hdev, L2CAP_CID_SMP);
3467 if (IS_ERR(chan))
3468 return PTR_ERR(chan);
3469
3470 hdev->smp_data = chan;
3471
b1f663c9
JH		 3472 debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev,
3473 &le_min_key_size_fops);
2fd36558
JH		 3474 debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev,
3475 &le_max_key_size_fops);
3476
300acfde
MH		 3477 /* If the controller does not support BR/EDR Secure Connections
3478 * feature, then the BR/EDR SMP channel shall not be present.
3479 *
3480 * To test this with Bluetooth 4.0 controllers, create a debugfs
3481 * switch that allows forcing BR/EDR SMP support and accepting
3482 * cross-transport pairing on non-AES encrypted connections.
3483 */
3484 if (!lmp_sc_capable(hdev)) {
3485 debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs,
3486 hdev, &force_bredr_smp_fops);
83ebb9ec
SJ		 3487
3488 /* Flag can be already set here (due to power toggle) */
3489 if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
3490 return 0;
300acfde 3491 }
ef8efe4b 3492
2b8df323
MH		 3493 if (WARN_ON(hdev->smp_bredr_data)) {
3494 chan = hdev->smp_bredr_data;
3495 hdev->smp_bredr_data = NULL;
3496 smp_del_chan(chan);
3497 }
3498
ef8efe4b
JH		 3499 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3500 if (IS_ERR(chan)) {
3501 int err = PTR_ERR(chan);
3502 chan = hdev->smp_data;
3503 hdev->smp_data = NULL;
3504 smp_del_chan(chan);
3505 return err;
3506 }
3507
3508 hdev->smp_bredr_data = chan;
3509
3510 return 0;
3511}
3512
3513void smp_unregister(struct hci_dev *hdev)
3514{
3515 struct l2cap_chan *chan;
3516
3517 if (hdev->smp_bredr_data) {
3518 chan = hdev->smp_bredr_data;
3519 hdev->smp_bredr_data = NULL;
3520 smp_del_chan(chan);
3521 }
3522
3523 if (hdev->smp_data) {
3524 chan = hdev->smp_data;
3525 hdev->smp_data = NULL;
3526 smp_del_chan(chan);
3527 }
3528}
0a2b0f04
JH		 3529
3530#if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
3531
47eb2ac8 3532static int __init test_debug_key(struct crypto_kpp *tfm_ecdh)
71653eb6 3533{
c0153b0b 3534 u8 pk[64];
a2976416 3535 int err;
71653eb6 3536
c0153b0b 3537 err = set_ecdh_privkey(tfm_ecdh, debug_sk);
a2976416
TA		 3538 if (err)
3539 return err;
71653eb6 3540
c0153b0b
TA		 3541 err = generate_ecdh_public_key(tfm_ecdh, pk);
3542 if (err)
3543 return err;
71653eb6 3544
329d8230 3545 if (crypto_memneq(pk, debug_pk, 64))
71653eb6
MH		 3546 return -EINVAL;
3547
3548 return 0;
3549}
3550
a4770e11 3551static int __init test_ah(struct crypto_cipher *tfm_aes)
cfc4198e
JH		 3552{
3553 const u8 irk[16] = {
3554 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3555 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3556 const u8 r[3] = { 0x94, 0x81, 0x70 };
3557 const u8 exp[3] = { 0xaa, 0xfb, 0x0d };
3558 u8 res[3];
3559 int err;
3560
3561 err = smp_ah(tfm_aes, irk, r, res);
3562 if (err)
3563 return err;
3564
329d8230 3565 if (crypto_memneq(res, exp, 3))
cfc4198e
JH		 3566 return -EINVAL;
3567
3568 return 0;
3569}
3570
a4770e11 3571static int __init test_c1(struct crypto_cipher *tfm_aes)
cfc4198e
JH		 3572{
3573 const u8 k[16] = {
3574 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3575 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3576 const u8 r[16] = {
3577 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63,
3578 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 };
3579 const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 };
3580 const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 };
3581 const u8 _iat = 0x01;
3582 const u8 _rat = 0x00;
3583 const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } };
3584 const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } };
3585 const u8 exp[16] = {
3586 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2,
3587 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e };
3588 u8 res[16];
3589 int err;
3590
3591 err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res);
3592 if (err)
3593 return err;
3594
329d8230 3595 if (crypto_memneq(res, exp, 16))
cfc4198e
JH		 3596 return -EINVAL;
3597
3598 return 0;
3599}
3600
a4770e11 3601static int __init test_s1(struct crypto_cipher *tfm_aes)
cfc4198e
JH		 3602{
3603 const u8 k[16] = {
3604 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3605 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3606 const u8 r1[16] = {
3607 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 };
3608 const u8 r2[16] = {
3609 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 };
3610 const u8 exp[16] = {
3611 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b,
3612 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a };
3613 u8 res[16];
3614 int err;
3615
3616 err = smp_s1(tfm_aes, k, r1, r2, res);
3617 if (err)
3618 return err;
3619
329d8230 3620 if (crypto_memneq(res, exp, 16))
cfc4198e
JH		 3621 return -EINVAL;
3622
3623 return 0;
3624}
3625
71af2f6b 3626static int __init test_f4(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3627{
3628 const u8 u[32] = {
3629 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3630 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3631 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3632 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3633 const u8 v[32] = {
3634 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3635 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3636 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3637 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3638 const u8 x[16] = {
3639 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3640 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3641 const u8 z = 0x00;
3642 const u8 exp[16] = {
3643 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1,
3644 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 };
3645 u8 res[16];
3646 int err;
3647
3648 err = smp_f4(tfm_cmac, u, v, x, z, res);
3649 if (err)
3650 return err;
3651
329d8230 3652 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3653 return -EINVAL;
3654
3655 return 0;
3656}
3657
71af2f6b 3658static int __init test_f5(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3659{
3660 const u8 w[32] = {
3661 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86,
3662 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99,
3663 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3664 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3665 const u8 n1[16] = {
3666 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3667 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3668 const u8 n2[16] = {
3669 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3670 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3671 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3672 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3673 const u8 exp_ltk[16] = {
3674 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98,
3675 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 };
3676 const u8 exp_mackey[16] = {
3677 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3678 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3679 u8 mackey[16], ltk[16];
3680 int err;
3681
3682 err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk);
3683 if (err)
3684 return err;
3685
329d8230 3686 if (crypto_memneq(mackey, exp_mackey, 16))
fb2969a3
JH		 3687 return -EINVAL;
3688
329d8230 3689 if (crypto_memneq(ltk, exp_ltk, 16))
fb2969a3
JH		 3690 return -EINVAL;
3691
3692 return 0;
3693}
3694
71af2f6b 3695static int __init test_f6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3696{
3697 const u8 w[16] = {
3698 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3699 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3700 const u8 n1[16] = {
3701 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3702 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3703 const u8 n2[16] = {
3704 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3705 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3706 const u8 r[16] = {
3707 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08,
3708 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 };
3709 const u8 io_cap[3] = { 0x02, 0x01, 0x01 };
3710 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3711 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3712 const u8 exp[16] = {
3713 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2,
3714 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 };
3715 u8 res[16];
3716 int err;
3717
3718 err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res);
3719 if (err)
3720 return err;
3721
329d8230 3722 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3723 return -EINVAL;
3724
3725 return 0;
3726}
3727
71af2f6b 3728static int __init test_g2(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3729{
3730 const u8 u[32] = {
3731 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3732 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3733 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3734 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3735 const u8 v[32] = {
3736 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3737 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3738 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3739 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3740 const u8 x[16] = {
3741 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3742 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3743 const u8 y[16] = {
3744 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3745 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3746 const u32 exp_val = 0x2f9ed5ba % 1000000;
3747 u32 val;
3748 int err;
3749
3750 err = smp_g2(tfm_cmac, u, v, x, y, &val);
3751 if (err)
3752 return err;
3753
3754 if (val != exp_val)
3755 return -EINVAL;
3756
3757 return 0;
3758}
3759
71af2f6b 3760static int __init test_h6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3761{
3762 const u8 w[16] = {
3763 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3764 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3765 const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c };
3766 const u8 exp[16] = {
3767 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8,
3768 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d };
3769 u8 res[16];
3770 int err;
3771
3772 err = smp_h6(tfm_cmac, w, key_id, res);
3773 if (err)
3774 return err;
3775
329d8230 3776 if (crypto_memneq(res, exp, 16))
fb2969a3
JH		 3777 return -EINVAL;
3778
3779 return 0;
3780}
3781
64dd374e
MH		 3782static char test_smp_buffer[32];
3783
3784static ssize_t test_smp_read(struct file *file, char __user *user_buf,
3785 size_t count, loff_t *ppos)
3786{
3787 return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer,
3788 strlen(test_smp_buffer));
3789}
3790
3791static const struct file_operations test_smp_fops = {
3792 .open = simple_open,
3793 .read = test_smp_read,
3794 .llseek = default_llseek,
3795};
3796
a4770e11 3797static int __init run_selftests(struct crypto_cipher *tfm_aes,
47eb2ac8
TA		 3798 struct crypto_shash *tfm_cmac,
3799 struct crypto_kpp *tfm_ecdh)
0a2b0f04 3800{
255047b0
MH		 3801 ktime_t calltime, delta, rettime;
3802 unsigned long long duration;
cfc4198e
JH		 3803 int err;
3804
255047b0
MH		 3805 calltime = ktime_get();
3806
47eb2ac8 3807 err = test_debug_key(tfm_ecdh);
71653eb6
MH		 3808 if (err) {
3809 BT_ERR("debug_key test failed");
3810 goto done;
3811 }
3812
cfc4198e
JH		 3813 err = test_ah(tfm_aes);
3814 if (err) {
3815 BT_ERR("smp_ah test failed");
64dd374e 3816 goto done;
cfc4198e
JH		 3817 }
3818
3819 err = test_c1(tfm_aes);
3820 if (err) {
3821 BT_ERR("smp_c1 test failed");
64dd374e 3822 goto done;
cfc4198e
JH		 3823 }
3824
3825 err = test_s1(tfm_aes);
3826 if (err) {
3827 BT_ERR("smp_s1 test failed");
64dd374e 3828 goto done;
cfc4198e
JH		 3829 }
3830
fb2969a3
JH		 3831 err = test_f4(tfm_cmac);
3832 if (err) {
3833 BT_ERR("smp_f4 test failed");
64dd374e 3834 goto done;
fb2969a3
JH		 3835 }
3836
3837 err = test_f5(tfm_cmac);
3838 if (err) {
3839 BT_ERR("smp_f5 test failed");
64dd374e 3840 goto done;
fb2969a3
JH		 3841 }
3842
3843 err = test_f6(tfm_cmac);
3844 if (err) {
3845 BT_ERR("smp_f6 test failed");
64dd374e 3846 goto done;
fb2969a3
JH		 3847 }
3848
3849 err = test_g2(tfm_cmac);
3850 if (err) {
3851 BT_ERR("smp_g2 test failed");
64dd374e 3852 goto done;
fb2969a3
JH		 3853 }
3854
3855 err = test_h6(tfm_cmac);
3856 if (err) {
3857 BT_ERR("smp_h6 test failed");
64dd374e 3858 goto done;
fb2969a3
JH		 3859 }
3860
255047b0
MH		 3861 rettime = ktime_get();
3862 delta = ktime_sub(rettime, calltime);
3863 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
3864
5ced2464 3865 BT_INFO("SMP test passed in %llu usecs", duration);
0a2b0f04 3866
64dd374e
MH		 3867done:
3868 if (!err)
3869 snprintf(test_smp_buffer, sizeof(test_smp_buffer),
3870 "PASS (%llu usecs)\n", duration);
3871 else
3872 snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n");
3873
3874 debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL,
3875 &test_smp_fops);
3876
3877 return err;
0a2b0f04
JH		 3878}
3879
3880int __init bt_selftest_smp(void)
3881{
a4770e11 3882 struct crypto_cipher *tfm_aes;
71af2f6b 3883 struct crypto_shash *tfm_cmac;
47eb2ac8 3884 struct crypto_kpp *tfm_ecdh;
0a2b0f04
JH		 3885 int err;
3886
a4770e11 3887 tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
0a2b0f04 3888 if (IS_ERR(tfm_aes)) {
a4770e11 3889 BT_ERR("Unable to create AES crypto context");
0a2b0f04
JH		 3890 return PTR_ERR(tfm_aes);
3891 }
3892
71af2f6b 3893 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, CRYPTO_ALG_ASYNC);
0a2b0f04
JH		 3894 if (IS_ERR(tfm_cmac)) {
3895 BT_ERR("Unable to create CMAC crypto context");
a4770e11 3896 crypto_free_cipher(tfm_aes);
0a2b0f04
JH		 3897 return PTR_ERR(tfm_cmac);
3898 }
3899
47eb2ac8
TA		 3900 tfm_ecdh = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0);
3901 if (IS_ERR(tfm_ecdh)) {
3902 BT_ERR("Unable to create ECDH crypto context");
3903 crypto_free_shash(tfm_cmac);
3904 crypto_free_cipher(tfm_aes);
3905 return PTR_ERR(tfm_ecdh);
3906 }
3907
3908 err = run_selftests(tfm_aes, tfm_cmac, tfm_ecdh);
0a2b0f04 3909
71af2f6b 3910 crypto_free_shash(tfm_cmac);
a4770e11 3911 crypto_free_cipher(tfm_aes);
47eb2ac8 3912 crypto_free_kpp(tfm_ecdh);
0a2b0f04
JH		 3913
3914 return err;
3915}
3916
3917#endif
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