]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - net/bluetooth/smp.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'dm-4.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device...
[mirror_ubuntu-artful-kernel.git] / net / bluetooth / smp.c
CommitLineData
eb492e01
AB		 1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License version 2 as
7 published by the Free Software Foundation;
8
9 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
10 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
11 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
12 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
13 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
14 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17
18 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
19 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
20 SOFTWARE IS DISCLAIMED.
21*/
22
300acfde 23#include <linux/debugfs.h>
8c520a59 24#include <linux/scatterlist.h>
a4770e11 25#include <linux/crypto.h>
8c520a59 26#include <crypto/b128ops.h>
71af2f6b 27#include <crypto/hash.h>
8c520a59 28
eb492e01
AB		 29#include <net/bluetooth/bluetooth.h>
30#include <net/bluetooth/hci_core.h>
31#include <net/bluetooth/l2cap.h>
2b64d153 32#include <net/bluetooth/mgmt.h>
ac4b7236 33
3b19146d 34#include "ecc.h"
ac4b7236 35#include "smp.h"
d22ef0bc 36
2fd36558
JH		 37#define SMP_DEV(hdev) \
38 ((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data)
39
c7a3d57d
JH		 40/* Low-level debug macros to be used for stuff that we don't want
41 * accidentially in dmesg, i.e. the values of the various crypto keys
42 * and the inputs & outputs of crypto functions.
43 */
44#ifdef DEBUG
45#define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \
46 ##__VA_ARGS__)
47#else
48#define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \
49 ##__VA_ARGS__)
50#endif
51
b28b4943 52#define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd)
b28b4943 53
3b19146d
JH		 54/* Keys which are not distributed with Secure Connections */
55#define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY);
56
17b02e62 57#define SMP_TIMEOUT msecs_to_jiffies(30000)
5d3de7df 58
d7a5a11d 59#define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \
a62da6f1 60 0x3f : 0x07)
0edb14de 61#define KEY_DIST_MASK 0x07
065a13e2 62
cbbbe3e2
JH		 63/* Maximum message length that can be passed to aes_cmac */
64#define CMAC_MSG_MAX 80
65
533e35d4
JH		 66enum {
67 SMP_FLAG_TK_VALID,
68 SMP_FLAG_CFM_PENDING,
69 SMP_FLAG_MITM_AUTH,
70 SMP_FLAG_COMPLETE,
71 SMP_FLAG_INITIATOR,
65668776 72 SMP_FLAG_SC,
d8f8edbe 73 SMP_FLAG_REMOTE_PK,
aeb7d461 74 SMP_FLAG_DEBUG_KEY,
38606f14 75 SMP_FLAG_WAIT_USER,
d3e54a87 76 SMP_FLAG_DHKEY_PENDING,
1a8bab4f
JH		 77 SMP_FLAG_REMOTE_OOB,
78 SMP_FLAG_LOCAL_OOB,
a62da6f1 79 SMP_FLAG_CT2,
533e35d4 80};
4bc58f51 81
88a479d9 82struct smp_dev {
60a27d65
MH		 83 /* Secure Connections OOB data */
84 u8 local_pk[64];
85 u8 local_sk[32];
fb334fee 86 u8 local_rand[16];
60a27d65
MH		 87 bool debug_key;
88
b1f663c9 89 u8 min_key_size;
2fd36558
JH		 90 u8 max_key_size;
91
a4770e11 92 struct crypto_cipher *tfm_aes;
71af2f6b 93 struct crypto_shash *tfm_cmac;
88a479d9
MH		 94};
95
4bc58f51 96struct smp_chan {
b68fda68
JH		 97 struct l2cap_conn *conn;
98 struct delayed_work security_timer;
b28b4943 99 unsigned long allow_cmd; /* Bitmask of allowed commands */
b68fda68 100
4bc58f51
JH		 101 u8 preq[7]; /* SMP Pairing Request */
102 u8 prsp[7]; /* SMP Pairing Response */
103 u8 prnd[16]; /* SMP Pairing Random (local) */
104 u8 rrnd[16]; /* SMP Pairing Random (remote) */
105 u8 pcnf[16]; /* SMP Pairing Confirm */
106 u8 tk[16]; /* SMP Temporary Key */
882fafad
JH		 107 u8 rr[16]; /* Remote OOB ra/rb value */
108 u8 lr[16]; /* Local OOB ra/rb value */
4bc58f51
JH		 109 u8 enc_key_size;
110 u8 remote_key_dist;
111 bdaddr_t id_addr;
112 u8 id_addr_type;
113 u8 irk[16];
114 struct smp_csrk *csrk;
115 struct smp_csrk *slave_csrk;
116 struct smp_ltk *ltk;
117 struct smp_ltk *slave_ltk;
118 struct smp_irk *remote_irk;
6a77083a 119 u8 *link_key;
4a74d658 120 unsigned long flags;
783e0574 121 u8 method;
38606f14 122 u8 passkey_round;
6a7bd103 123
3b19146d
JH		 124 /* Secure Connections variables */
125 u8 local_pk[64];
126 u8 local_sk[32];
d8f8edbe
JH		 127 u8 remote_pk[64];
128 u8 dhkey[32];
760b018b 129 u8 mackey[16];
3b19146d 130
a4770e11 131 struct crypto_cipher *tfm_aes;
71af2f6b 132 struct crypto_shash *tfm_cmac;
4bc58f51
JH		 133};
134
aeb7d461
JH		 135/* These debug key values are defined in the SMP section of the core
136 * specification. debug_pk is the public debug key and debug_sk the
137 * private debug key.
138 */
139static const u8 debug_pk[64] = {
140 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
141 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
142 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
143 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20,
144
145 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74,
146 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76,
147 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63,
148 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc,
149};
150
151static const u8 debug_sk[32] = {
152 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58,
153 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a,
154 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74,
155 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f,
156};
157
8a2936f4 158static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
d22ef0bc 159{
8a2936f4 160 size_t i;
d22ef0bc 161
8a2936f4
JH		 162 for (i = 0; i < len; i++)
163 dst[len - 1 - i] = src[i];
d22ef0bc
AB		 164}
165
06edf8de
JH		 166/* The following functions map to the LE SC SMP crypto functions
167 * AES-CMAC, f4, f5, f6, g2 and h6.
168 */
169
71af2f6b 170static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m,
cbbbe3e2
JH		 171 size_t len, u8 mac[16])
172{
173 uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
71af2f6b 174 SHASH_DESC_ON_STACK(desc, tfm);
cbbbe3e2
JH		 175 int err;
176
177 if (len > CMAC_MSG_MAX)
178 return -EFBIG;
179
180 if (!tfm) {
181 BT_ERR("tfm %p", tfm);
182 return -EINVAL;
183 }
184
71af2f6b
HX		 185 desc->tfm = tfm;
186 desc->flags = 0;
cbbbe3e2
JH		 187
188 /* Swap key and message from LSB to MSB */
189 swap_buf(k, tmp, 16);
190 swap_buf(m, msg_msb, len);
191
c7a3d57d
JH		 192 SMP_DBG("msg (len %zu) %*phN", len, (int) len, m);
193 SMP_DBG("key %16phN", k);
cbbbe3e2 194
71af2f6b 195 err = crypto_shash_setkey(tfm, tmp, 16);
cbbbe3e2
JH		 196 if (err) {
197 BT_ERR("cipher setkey failed: %d", err);
198 return err;
199 }
200
71af2f6b
HX		 201 err = crypto_shash_digest(desc, msg_msb, len, mac_msb);
202 shash_desc_zero(desc);
cbbbe3e2 203 if (err) {
71af2f6b 204 BT_ERR("Hash computation error %d", err);
cbbbe3e2
JH		 205 return err;
206 }
207
208 swap_buf(mac_msb, mac, 16);
209
c7a3d57d 210 SMP_DBG("mac %16phN", mac);
cbbbe3e2
JH		 211
212 return 0;
213}
214
71af2f6b
HX		 215static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32],
216 const u8 v[32], const u8 x[16], u8 z, u8 res[16])
cbbbe3e2
JH		 217{
218 u8 m[65];
219 int err;
220
c7a3d57d
JH		 221 SMP_DBG("u %32phN", u);
222 SMP_DBG("v %32phN", v);
223 SMP_DBG("x %16phN z %02x", x, z);
cbbbe3e2
JH		 224
225 m[0] = z;
226 memcpy(m + 1, v, 32);
227 memcpy(m + 33, u, 32);
228
229 err = aes_cmac(tfm_cmac, x, m, sizeof(m), res);
230 if (err)
231 return err;
232
c7a3d57d 233 SMP_DBG("res %16phN", res);
cbbbe3e2
JH		 234
235 return err;
236}
237
71af2f6b 238static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32],
4da50de8
JH		 239 const u8 n1[16], const u8 n2[16], const u8 a1[7],
240 const u8 a2[7], u8 mackey[16], u8 ltk[16])
760b018b
JH		 241{
242 /* The btle, salt and length "magic" values are as defined in
243 * the SMP section of the Bluetooth core specification. In ASCII
244 * the btle value ends up being 'btle'. The salt is just a
245 * random number whereas length is the value 256 in little
246 * endian format.
247 */
248 const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 };
249 const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60,
250 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c };
251 const u8 length[2] = { 0x00, 0x01 };
252 u8 m[53], t[16];
253 int err;
254
c7a3d57d
JH		 255 SMP_DBG("w %32phN", w);
256 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
257 SMP_DBG("a1 %7phN a2 %7phN", a1, a2);
760b018b
JH		 258
259 err = aes_cmac(tfm_cmac, salt, w, 32, t);
260 if (err)
261 return err;
262
c7a3d57d 263 SMP_DBG("t %16phN", t);
760b018b
JH		 264
265 memcpy(m, length, 2);
266 memcpy(m + 2, a2, 7);
267 memcpy(m + 9, a1, 7);
268 memcpy(m + 16, n2, 16);
269 memcpy(m + 32, n1, 16);
270 memcpy(m + 48, btle, 4);
271
272 m[52] = 0; /* Counter */
273
274 err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey);
275 if (err)
276 return err;
277
c7a3d57d 278 SMP_DBG("mackey %16phN", mackey);
760b018b
JH		 279
280 m[52] = 1; /* Counter */
281
282 err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk);
283 if (err)
284 return err;
285
c7a3d57d 286 SMP_DBG("ltk %16phN", ltk);
760b018b
JH		 287
288 return 0;
289}
290
71af2f6b 291static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16],
4da50de8 292 const u8 n1[16], const u8 n2[16], const u8 r[16],
760b018b
JH		 293 const u8 io_cap[3], const u8 a1[7], const u8 a2[7],
294 u8 res[16])
295{
296 u8 m[65];
297 int err;
298
c7a3d57d
JH		 299 SMP_DBG("w %16phN", w);
300 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
301 SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2);
760b018b
JH		 302
303 memcpy(m, a2, 7);
304 memcpy(m + 7, a1, 7);
305 memcpy(m + 14, io_cap, 3);
306 memcpy(m + 17, r, 16);
307 memcpy(m + 33, n2, 16);
308 memcpy(m + 49, n1, 16);
309
310 err = aes_cmac(tfm_cmac, w, m, sizeof(m), res);
311 if (err)
312 return err;
313
203de21b 314 SMP_DBG("res %16phN", res);
760b018b
JH		 315
316 return err;
317}
318
71af2f6b 319static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32],
191dc7fe
JH		 320 const u8 x[16], const u8 y[16], u32 *val)
321{
322 u8 m[80], tmp[16];
323 int err;
324
c7a3d57d
JH		 325 SMP_DBG("u %32phN", u);
326 SMP_DBG("v %32phN", v);
327 SMP_DBG("x %16phN y %16phN", x, y);
191dc7fe
JH		 328
329 memcpy(m, y, 16);
330 memcpy(m + 16, v, 32);
331 memcpy(m + 48, u, 32);
332
333 err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
334 if (err)
335 return err;
336
337 *val = get_unaligned_le32(tmp);
338 *val %= 1000000;
339
c7a3d57d 340 SMP_DBG("val %06u", *val);
191dc7fe
JH		 341
342 return 0;
343}
344
71af2f6b 345static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16],
06edf8de
JH		 346 const u8 key_id[4], u8 res[16])
347{
348 int err;
349
350 SMP_DBG("w %16phN key_id %4phN", w, key_id);
351
352 err = aes_cmac(tfm_cmac, w, key_id, 4, res);
353 if (err)
354 return err;
355
356 SMP_DBG("res %16phN", res);
357
358 return err;
359}
360
a62da6f1
JH		 361static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16],
362 const u8 salt[16], u8 res[16])
363{
364 int err;
365
366 SMP_DBG("w %16phN salt %16phN", w, salt);
367
368 err = aes_cmac(tfm_cmac, salt, w, 16, res);
369 if (err)
370 return err;
371
372 SMP_DBG("res %16phN", res);
373
374 return err;
375}
376
06edf8de
JH		 377/* The following functions map to the legacy SMP crypto functions e, c1,
378 * s1 and ah.
379 */
380
a4770e11 381static int smp_e(struct crypto_cipher *tfm, const u8 *k, u8 *r)
d22ef0bc 382{
943a732a 383 uint8_t tmp[16], data[16];
201a5929 384 int err;
d22ef0bc 385
011c391a
JH		 386 SMP_DBG("k %16phN r %16phN", k, r);
387
7f376cd6 388 if (!tfm) {
d22ef0bc
AB		 389 BT_ERR("tfm %p", tfm);
390 return -EINVAL;
391 }
392
943a732a 393 /* The most significant octet of key corresponds to k[0] */
8a2936f4 394 swap_buf(k, tmp, 16);
943a732a 395
a4770e11 396 err = crypto_cipher_setkey(tfm, tmp, 16);
d22ef0bc
AB		 397 if (err) {
398 BT_ERR("cipher setkey failed: %d", err);
399 return err;
400 }
401
943a732a 402 /* Most significant octet of plaintextData corresponds to data[0] */
8a2936f4 403 swap_buf(r, data, 16);
943a732a 404
a4770e11 405 crypto_cipher_encrypt_one(tfm, data, data);
d22ef0bc 406
943a732a 407 /* Most significant octet of encryptedData corresponds to data[0] */
8a2936f4 408 swap_buf(data, r, 16);
943a732a 409
011c391a
JH		 410 SMP_DBG("r %16phN", r);
411
d22ef0bc
AB		 412 return err;
413}
414
a4770e11 415static int smp_c1(struct crypto_cipher *tfm_aes, const u8 k[16],
06edf8de
JH		 416 const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
417 const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
6a77083a 418{
06edf8de 419 u8 p1[16], p2[16];
6a77083a
JH		 420 int err;
421
011c391a
JH		 422 SMP_DBG("k %16phN r %16phN", k, r);
423 SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra);
424 SMP_DBG("preq %7phN pres %7phN", preq, pres);
425
06edf8de 426 memset(p1, 0, 16);
6a77083a 427
06edf8de
JH		 428 /* p1 = pres || preq || _rat || _iat */
429 p1[0] = _iat;
430 p1[1] = _rat;
431 memcpy(p1 + 2, preq, 7);
432 memcpy(p1 + 9, pres, 7);
433
011c391a 434 SMP_DBG("p1 %16phN", p1);
06edf8de
JH		 435
436 /* res = r XOR p1 */
437 u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
438
439 /* res = e(k, res) */
440 err = smp_e(tfm_aes, k, res);
441 if (err) {
442 BT_ERR("Encrypt data error");
6a77083a 443 return err;
06edf8de 444 }
6a77083a 445
011c391a
JH		 446 /* p2 = padding || ia || ra */
447 memcpy(p2, ra, 6);
448 memcpy(p2 + 6, ia, 6);
449 memset(p2 + 12, 0, 4);
450
451 SMP_DBG("p2 %16phN", p2);
452
06edf8de
JH		 453 /* res = res XOR p2 */
454 u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
455
456 /* res = e(k, res) */
457 err = smp_e(tfm_aes, k, res);
458 if (err)
459 BT_ERR("Encrypt data error");
460
461 return err;
462}
463
a4770e11 464static int smp_s1(struct crypto_cipher *tfm_aes, const u8 k[16],
06edf8de
JH		 465 const u8 r1[16], const u8 r2[16], u8 _r[16])
466{
467 int err;
468
469 /* Just least significant octets from r1 and r2 are considered */
470 memcpy(_r, r2, 8);
471 memcpy(_r + 8, r1, 8);
472
473 err = smp_e(tfm_aes, k, _r);
474 if (err)
475 BT_ERR("Encrypt data error");
6a77083a
JH		 476
477 return err;
478}
479
a4770e11 480static int smp_ah(struct crypto_cipher *tfm, const u8 irk[16],
cd082797 481 const u8 r[3], u8 res[3])
60478054 482{
943a732a 483 u8 _res[16];
60478054
JH		 484 int err;
485
486 /* r' = padding || r */
943a732a
JH		 487 memcpy(_res, r, 3);
488 memset(_res + 3, 0, 13);
60478054 489
943a732a 490 err = smp_e(tfm, irk, _res);
60478054
JH		 491 if (err) {
492 BT_ERR("Encrypt error");
493 return err;
494 }
495
496 /* The output of the random address function ah is:
c5080d42 497 * ah(k, r) = e(k, r') mod 2^24
60478054
JH		 498 * The output of the security function e is then truncated to 24 bits
499 * by taking the least significant 24 bits of the output of e as the
500 * result of ah.
501 */
943a732a 502 memcpy(res, _res, 3);
60478054
JH		 503
504 return 0;
505}
506
cd082797
JH		 507bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
508 const bdaddr_t *bdaddr)
60478054 509{
defce9e8 510 struct l2cap_chan *chan = hdev->smp_data;
88a479d9 511 struct smp_dev *smp;
60478054
JH		 512 u8 hash[3];
513 int err;
514
defce9e8
JH		 515 if (!chan || !chan->data)
516 return false;
517
88a479d9 518 smp = chan->data;
defce9e8 519
60478054
JH		 520 BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk);
521
88a479d9 522 err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash);
60478054
JH		 523 if (err)
524 return false;
525
526 return !memcmp(bdaddr->b, hash, 3);
527}
528
cd082797 529int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
b1e2b3ae 530{
defce9e8 531 struct l2cap_chan *chan = hdev->smp_data;
88a479d9 532 struct smp_dev *smp;
b1e2b3ae
JH		 533 int err;
534
defce9e8
JH		 535 if (!chan || !chan->data)
536 return -EOPNOTSUPP;
537
88a479d9 538 smp = chan->data;
defce9e8 539
b1e2b3ae
JH		 540 get_random_bytes(&rpa->b[3], 3);
541
542 rpa->b[5] &= 0x3f; /* Clear two most significant bits */
543 rpa->b[5] |= 0x40; /* Set second most significant bit */
544
88a479d9 545 err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b);
b1e2b3ae
JH		 546 if (err < 0)
547 return err;
548
549 BT_DBG("RPA %pMR", rpa);
550
551 return 0;
552}
553
60a27d65
MH		 554int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
555{
556 struct l2cap_chan *chan = hdev->smp_data;
557 struct smp_dev *smp;
558 int err;
559
560 if (!chan || !chan->data)
561 return -EOPNOTSUPP;
562
563 smp = chan->data;
564
565 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
566 BT_DBG("Using debug keys");
567 memcpy(smp->local_pk, debug_pk, 64);
568 memcpy(smp->local_sk, debug_sk, 32);
569 smp->debug_key = true;
570 } else {
571 while (true) {
572 /* Generate local key pair for Secure Connections */
573 if (!ecc_make_key(smp->local_pk, smp->local_sk))
574 return -EIO;
575
576 /* This is unlikely, but we need to check that
577 * we didn't accidentially generate a debug key.
578 */
579 if (memcmp(smp->local_sk, debug_sk, 32))
580 break;
581 }
582 smp->debug_key = false;
583 }
584
585 SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
586 SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
587 SMP_DBG("OOB Private Key: %32phN", smp->local_sk);
588
fb334fee 589 get_random_bytes(smp->local_rand, 16);
60a27d65
MH		 590
591 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
fb334fee 592 smp->local_rand, 0, hash);
60a27d65
MH		 593 if (err < 0)
594 return err;
595
fb334fee 596 memcpy(rand, smp->local_rand, 16);
60a27d65
MH		 597
598 return 0;
599}
600
5d88cc73 601static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
eb492e01 602{
5d88cc73 603 struct l2cap_chan *chan = conn->smp;
b68fda68 604 struct smp_chan *smp;
5d88cc73
JH		 605 struct kvec iv[2];
606 struct msghdr msg;
eb492e01 607
5d88cc73
JH		 608 if (!chan)
609 return;
eb492e01 610
5d88cc73 611 BT_DBG("code 0x%2.2x", code);
eb492e01 612
5d88cc73
JH		 613 iv[0].iov_base = &code;
614 iv[0].iov_len = 1;
eb492e01 615
5d88cc73
JH		 616 iv[1].iov_base = data;
617 iv[1].iov_len = len;
eb492e01 618
5d88cc73 619 memset(&msg, 0, sizeof(msg));
eb492e01 620
17836394 621 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len);
eb492e01 622
5d88cc73 623 l2cap_chan_send(chan, &msg, 1 + len);
e2dcd113 624
b68fda68
JH		 625 if (!chan->data)
626 return;
627
628 smp = chan->data;
629
630 cancel_delayed_work_sync(&smp->security_timer);
1b0921d6 631 schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
eb492e01
AB		 632}
633
d2eb9e10 634static u8 authreq_to_seclevel(u8 authreq)
2b64d153 635{
d2eb9e10
JH		 636 if (authreq & SMP_AUTH_MITM) {
637 if (authreq & SMP_AUTH_SC)
638 return BT_SECURITY_FIPS;
639 else
640 return BT_SECURITY_HIGH;
641 } else {
2b64d153 642 return BT_SECURITY_MEDIUM;
d2eb9e10 643 }
2b64d153
BG		 644}
645
646static __u8 seclevel_to_authreq(__u8 sec_level)
647{
648 switch (sec_level) {
d2eb9e10 649 case BT_SECURITY_FIPS:
2b64d153
BG		 650 case BT_SECURITY_HIGH:
651 return SMP_AUTH_MITM | SMP_AUTH_BONDING;
652 case BT_SECURITY_MEDIUM:
653 return SMP_AUTH_BONDING;
654 default:
655 return SMP_AUTH_NONE;
656 }
657}
658
b8e66eac 659static void build_pairing_cmd(struct l2cap_conn *conn,
f1560463
MH		 660 struct smp_cmd_pairing *req,
661 struct smp_cmd_pairing *rsp, __u8 authreq)
b8e66eac 662{
5d88cc73
JH		 663 struct l2cap_chan *chan = conn->smp;
664 struct smp_chan *smp = chan->data;
fd349c02
JH		 665 struct hci_conn *hcon = conn->hcon;
666 struct hci_dev *hdev = hcon->hdev;
02b05bd8 667 u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT;
54790f73 668
d7a5a11d 669 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
7ee4ea36
MH		 670 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
671 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
54790f73 672 authreq |= SMP_AUTH_BONDING;
2b64d153
BG		 673 } else {
674 authreq &= ~SMP_AUTH_BONDING;
54790f73
VCG		 675 }
676
d7a5a11d 677 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
fd349c02
JH		 678 remote_dist |= SMP_DIST_ID_KEY;
679
d7a5a11d 680 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
863efaf2
JH		 681 local_dist |= SMP_DIST_ID_KEY;
682
d7a5a11d 683 if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&
02b05bd8
JH		 684 (authreq & SMP_AUTH_SC)) {
685 struct oob_data *oob_data;
686 u8 bdaddr_type;
687
d7a5a11d 688 if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
df8e1a4c
JH		 689 local_dist |= SMP_DIST_LINK_KEY;
690 remote_dist |= SMP_DIST_LINK_KEY;
691 }
02b05bd8
JH		 692
693 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
694 bdaddr_type = BDADDR_LE_PUBLIC;
695 else
696 bdaddr_type = BDADDR_LE_RANDOM;
697
698 oob_data = hci_find_remote_oob_data(hdev, &hcon->dst,
699 bdaddr_type);
4775a4ea 700 if (oob_data && oob_data->present) {
1a8bab4f 701 set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags);
02b05bd8 702 oob_flag = SMP_OOB_PRESENT;
a29b0733 703 memcpy(smp->rr, oob_data->rand256, 16);
02b05bd8 704 memcpy(smp->pcnf, oob_data->hash256, 16);
bc07cd69
MH		 705 SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf);
706 SMP_DBG("OOB Remote Random: %16phN", smp->rr);
02b05bd8
JH		 707 }
708
df8e1a4c
JH		 709 } else {
710 authreq &= ~SMP_AUTH_SC;
711 }
712
54790f73
VCG		 713 if (rsp == NULL) {
714 req->io_capability = conn->hcon->io_capability;
02b05bd8 715 req->oob_flag = oob_flag;
2fd36558 716 req->max_key_size = SMP_DEV(hdev)->max_key_size;
fd349c02
JH		 717 req->init_key_dist = local_dist;
718 req->resp_key_dist = remote_dist;
0edb14de 719 req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 720
721 smp->remote_key_dist = remote_dist;
54790f73
VCG		 722 return;
723 }
724
725 rsp->io_capability = conn->hcon->io_capability;
02b05bd8 726 rsp->oob_flag = oob_flag;
2fd36558 727 rsp->max_key_size = SMP_DEV(hdev)->max_key_size;
fd349c02
JH		 728 rsp->init_key_dist = req->init_key_dist & remote_dist;
729 rsp->resp_key_dist = req->resp_key_dist & local_dist;
0edb14de 730 rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
fd349c02
JH		 731
732 smp->remote_key_dist = rsp->init_key_dist;
b8e66eac
VCG		 733}
734
3158c50c
VCG		 735static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
736{
5d88cc73 737 struct l2cap_chan *chan = conn->smp;
2fd36558 738 struct hci_dev *hdev = conn->hcon->hdev;
5d88cc73 739 struct smp_chan *smp = chan->data;
1c1def09 740
2fd36558
JH		 741 if (max_key_size > SMP_DEV(hdev)->max_key_size ||
742 max_key_size < SMP_MIN_ENC_KEY_SIZE)
3158c50c
VCG		 743 return SMP_ENC_KEY_SIZE;
744
f7aa611a 745 smp->enc_key_size = max_key_size;
3158c50c
VCG		 746
747 return 0;
748}
749
6f48e260
JH		 750static void smp_chan_destroy(struct l2cap_conn *conn)
751{
752 struct l2cap_chan *chan = conn->smp;
753 struct smp_chan *smp = chan->data;
923e2414 754 struct hci_conn *hcon = conn->hcon;
6f48e260
JH		 755 bool complete;
756
757 BUG_ON(!smp);
758
759 cancel_delayed_work_sync(&smp->security_timer);
6f48e260 760
6f48e260 761 complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
923e2414 762 mgmt_smp_complete(hcon, complete);
6f48e260 763
276812ec
MH		 764 kzfree(smp->csrk);
765 kzfree(smp->slave_csrk);
766 kzfree(smp->link_key);
6f48e260 767
a4770e11 768 crypto_free_cipher(smp->tfm_aes);
71af2f6b 769 crypto_free_shash(smp->tfm_cmac);
6f48e260 770
923e2414
JH		 771 /* Ensure that we don't leave any debug key around if debug key
772 * support hasn't been explicitly enabled.
773 */
774 if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG &&
d7a5a11d 775 !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) {
923e2414
JH		 776 list_del_rcu(&smp->ltk->list);
777 kfree_rcu(smp->ltk, rcu);
778 smp->ltk = NULL;
779 }
780
6f48e260
JH		 781 /* If pairing failed clean up any keys we might have */
782 if (!complete) {
783 if (smp->ltk) {
970d0f1b
JH		 784 list_del_rcu(&smp->ltk->list);
785 kfree_rcu(smp->ltk, rcu);
6f48e260
JH		 786 }
787
788 if (smp->slave_ltk) {
970d0f1b
JH		 789 list_del_rcu(&smp->slave_ltk->list);
790 kfree_rcu(smp->slave_ltk, rcu);
6f48e260
JH		 791 }
792
793 if (smp->remote_irk) {
adae20cb
JH		 794 list_del_rcu(&smp->remote_irk->list);
795 kfree_rcu(smp->remote_irk, rcu);
6f48e260
JH		 796 }
797 }
798
799 chan->data = NULL;
276812ec 800 kzfree(smp);
923e2414 801 hci_conn_drop(hcon);
6f48e260
JH		 802}
803
84794e11 804static void smp_failure(struct l2cap_conn *conn, u8 reason)
4f957a76 805{
bab73cb6 806 struct hci_conn *hcon = conn->hcon;
b68fda68 807 struct l2cap_chan *chan = conn->smp;
bab73cb6 808
84794e11 809 if (reason)
4f957a76 810 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
f1560463 811 &reason);
4f957a76 812
e1e930f5 813 mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE);
f1c09c07 814
fc75cc86 815 if (chan->data)
f1c09c07 816 smp_chan_destroy(conn);
4f957a76
BG		 817}
818
2b64d153
BG		 819#define JUST_WORKS 0x00
820#define JUST_CFM 0x01
821#define REQ_PASSKEY 0x02
822#define CFM_PASSKEY 0x03
823#define REQ_OOB 0x04
5e3d3d9b 824#define DSP_PASSKEY 0x05
2b64d153
BG		 825#define OVERLAP 0xFF
826
827static const u8 gen_method[5][5] = {
828 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
829 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
830 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
831 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
832 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
833};
834
5e3d3d9b
JH		 835static const u8 sc_method[5][5] = {
836 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
837 { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
838 { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY },
839 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
840 { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
841};
842
581370cc
JH		 843static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io)
844{
2bcd4003
JH		 845 /* If either side has unknown io_caps, use JUST_CFM (which gets
846 * converted later to JUST_WORKS if we're initiators.
847 */
581370cc
JH		 848 if (local_io > SMP_IO_KEYBOARD_DISPLAY ||
849 remote_io > SMP_IO_KEYBOARD_DISPLAY)
2bcd4003 850 return JUST_CFM;
581370cc 851
5e3d3d9b
JH		 852 if (test_bit(SMP_FLAG_SC, &smp->flags))
853 return sc_method[remote_io][local_io];
854
581370cc
JH		 855 return gen_method[remote_io][local_io];
856}
857
2b64d153
BG		 858static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
859 u8 local_io, u8 remote_io)
860{
861 struct hci_conn *hcon = conn->hcon;
5d88cc73
JH		 862 struct l2cap_chan *chan = conn->smp;
863 struct smp_chan *smp = chan->data;
2b64d153
BG		 864 u32 passkey = 0;
865 int ret = 0;
866
867 /* Initialize key for JUST WORKS */
868 memset(smp->tk, 0, sizeof(smp->tk));
4a74d658 869 clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 870
871 BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io);
872
2bcd4003
JH		 873 /* If neither side wants MITM, either "just" confirm an incoming
874 * request or use just-works for outgoing ones. The JUST_CFM
875 * will be converted to JUST_WORKS if necessary later in this
876 * function. If either side has MITM look up the method from the
877 * table.
878 */
581370cc 879 if (!(auth & SMP_AUTH_MITM))
783e0574 880 smp->method = JUST_CFM;
2b64d153 881 else
783e0574 882 smp->method = get_auth_method(smp, local_io, remote_io);
2b64d153 883
a82505c7 884 /* Don't confirm locally initiated pairing attempts */
783e0574
JH		 885 if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
886 &smp->flags))
887 smp->method = JUST_WORKS;
a82505c7 888
02f3e254 889 /* Don't bother user space with no IO capabilities */
783e0574
JH		 890 if (smp->method == JUST_CFM &&
891 hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
892 smp->method = JUST_WORKS;
02f3e254 893
2b64d153 894 /* If Just Works, Continue with Zero TK */
783e0574 895 if (smp->method == JUST_WORKS) {
4a74d658 896 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 897 return 0;
898 }
899
19c5ce9c
JH		 900 /* If this function is used for SC -> legacy fallback we
901 * can only recover the just-works case.
902 */
903 if (test_bit(SMP_FLAG_SC, &smp->flags))
904 return -EINVAL;
905
2b64d153 906 /* Not Just Works/Confirm results in MITM Authentication */
783e0574 907 if (smp->method != JUST_CFM) {
4a74d658 908 set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
5eb596f5
JH		 909 if (hcon->pending_sec_level < BT_SECURITY_HIGH)
910 hcon->pending_sec_level = BT_SECURITY_HIGH;
911 }
2b64d153
BG		 912
913 /* If both devices have Keyoard-Display I/O, the master
914 * Confirms and the slave Enters the passkey.
915 */
783e0574 916 if (smp->method == OVERLAP) {
40bef302 917 if (hcon->role == HCI_ROLE_MASTER)
783e0574 918 smp->method = CFM_PASSKEY;
2b64d153 919 else
783e0574 920 smp->method = REQ_PASSKEY;
2b64d153
BG		 921 }
922
01ad34d2 923 /* Generate random passkey. */
783e0574 924 if (smp->method == CFM_PASSKEY) {
943a732a 925 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153
BG		 926 get_random_bytes(&passkey, sizeof(passkey));
927 passkey %= 1000000;
943a732a 928 put_unaligned_le32(passkey, smp->tk);
2b64d153 929 BT_DBG("PassKey: %d", passkey);
4a74d658 930 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 931 }
932
783e0574 933 if (smp->method == REQ_PASSKEY)
ce39fb4e 934 ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst,
272d90df 935 hcon->type, hcon->dst_type);
783e0574 936 else if (smp->method == JUST_CFM)
4eb65e66
JH		 937 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
938 hcon->type, hcon->dst_type,
939 passkey, 1);
2b64d153 940 else
01ad34d2 941 ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst,
272d90df 942 hcon->type, hcon->dst_type,
39adbffe 943 passkey, 0);
2b64d153 944
2b64d153
BG		 945 return ret;
946}
947
1cc61144 948static u8 smp_confirm(struct smp_chan *smp)
8aab4757 949{
8aab4757 950 struct l2cap_conn *conn = smp->conn;
8aab4757
VCG		 951 struct smp_cmd_pairing_confirm cp;
952 int ret;
8aab4757
VCG		 953
954 BT_DBG("conn %p", conn);
955
e491eaf3 956 ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp,
b1cd5fd9 957 conn->hcon->init_addr_type, &conn->hcon->init_addr,
943a732a
JH		 958 conn->hcon->resp_addr_type, &conn->hcon->resp_addr,
959 cp.confirm_val);
1cc61144
JH		 960 if (ret)
961 return SMP_UNSPECIFIED;
8aab4757 962
4a74d658 963 clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153 964
8aab4757
VCG		 965 smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
966
b28b4943
JH		 967 if (conn->hcon->out)
968 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
969 else
970 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
971
1cc61144 972 return 0;
8aab4757
VCG		 973}
974
861580a9 975static u8 smp_random(struct smp_chan *smp)
8aab4757 976{
8aab4757
VCG		 977 struct l2cap_conn *conn = smp->conn;
978 struct hci_conn *hcon = conn->hcon;
861580a9 979 u8 confirm[16];
8aab4757
VCG		 980 int ret;
981
ec70f36f 982 if (IS_ERR_OR_NULL(smp->tfm_aes))
861580a9 983 return SMP_UNSPECIFIED;
8aab4757
VCG		 984
985 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
986
e491eaf3 987 ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp,
b1cd5fd9 988 hcon->init_addr_type, &hcon->init_addr,
943a732a 989 hcon->resp_addr_type, &hcon->resp_addr, confirm);
861580a9
JH		 990 if (ret)
991 return SMP_UNSPECIFIED;
8aab4757 992
8aab4757
VCG		 993 if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
994 BT_ERR("Pairing failed (confirmation values mismatch)");
861580a9 995 return SMP_CONFIRM_FAILED;
8aab4757
VCG		 996 }
997
998 if (hcon->out) {
fe39c7b2
MH		 999 u8 stk[16];
1000 __le64 rand = 0;
1001 __le16 ediv = 0;
8aab4757 1002
e491eaf3 1003 smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk);
8aab4757 1004
861580a9
JH		 1005 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
1006 return SMP_UNSPECIFIED;
8aab4757 1007
8b76ce34 1008 hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size);
f7aa611a 1009 hcon->enc_key_size = smp->enc_key_size;
fe59a05f 1010 set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
8aab4757 1011 } else {
fff3490f 1012 u8 stk[16], auth;
fe39c7b2
MH		 1013 __le64 rand = 0;
1014 __le16 ediv = 0;
8aab4757 1015
943a732a
JH		 1016 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
1017 smp->prnd);
8aab4757 1018
e491eaf3 1019 smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk);
8aab4757 1020
fff3490f
JH		 1021 if (hcon->pending_sec_level == BT_SECURITY_HIGH)
1022 auth = 1;
1023 else
1024 auth = 0;
1025
7d5843b7
JH		 1026 /* Even though there's no _SLAVE suffix this is the
1027 * slave STK we're adding for later lookup (the master
1028 * STK never needs to be stored).
1029 */
ce39fb4e 1030 hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
2ceba539 1031 SMP_STK, auth, stk, smp->enc_key_size, ediv, rand);
8aab4757
VCG		 1032 }
1033
861580a9 1034 return 0;
8aab4757
VCG		 1035}
1036
44f1a7ab
JH		 1037static void smp_notify_keys(struct l2cap_conn *conn)
1038{
1039 struct l2cap_chan *chan = conn->smp;
1040 struct smp_chan *smp = chan->data;
1041 struct hci_conn *hcon = conn->hcon;
1042 struct hci_dev *hdev = hcon->hdev;
1043 struct smp_cmd_pairing *req = (void *) &smp->preq[1];
1044 struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1];
1045 bool persistent;
1046
cad20c27
JH		 1047 if (hcon->type == ACL_LINK) {
1048 if (hcon->key_type == HCI_LK_DEBUG_COMBINATION)
1049 persistent = false;
1050 else
1051 persistent = !test_bit(HCI_CONN_FLUSH_KEY,
1052 &hcon->flags);
1053 } else {
1054 /* The LTKs, IRKs and CSRKs should be persistent only if
1055 * both sides had the bonding bit set in their
1056 * authentication requests.
1057 */
1058 persistent = !!((req->auth_req & rsp->auth_req) &
1059 SMP_AUTH_BONDING);
1060 }
1061
44f1a7ab 1062 if (smp->remote_irk) {
cad20c27
JH		 1063 mgmt_new_irk(hdev, smp->remote_irk, persistent);
1064
44f1a7ab
JH		 1065 /* Now that user space can be considered to know the
1066 * identity address track the connection based on it
b5ae344d 1067 * from now on (assuming this is an LE link).
44f1a7ab 1068 */
b5ae344d
JH		 1069 if (hcon->type == LE_LINK) {
1070 bacpy(&hcon->dst, &smp->remote_irk->bdaddr);
1071 hcon->dst_type = smp->remote_irk->addr_type;
1072 queue_work(hdev->workqueue, &conn->id_addr_update_work);
1073 }
44f1a7ab
JH		 1074 }
1075
44f1a7ab
JH		 1076 if (smp->csrk) {
1077 smp->csrk->bdaddr_type = hcon->dst_type;
1078 bacpy(&smp->csrk->bdaddr, &hcon->dst);
1079 mgmt_new_csrk(hdev, smp->csrk, persistent);
1080 }
1081
1082 if (smp->slave_csrk) {
1083 smp->slave_csrk->bdaddr_type = hcon->dst_type;
1084 bacpy(&smp->slave_csrk->bdaddr, &hcon->dst);
1085 mgmt_new_csrk(hdev, smp->slave_csrk, persistent);
1086 }
1087
1088 if (smp->ltk) {
1089 smp->ltk->bdaddr_type = hcon->dst_type;
1090 bacpy(&smp->ltk->bdaddr, &hcon->dst);
1091 mgmt_new_ltk(hdev, smp->ltk, persistent);
1092 }
1093
1094 if (smp->slave_ltk) {
1095 smp->slave_ltk->bdaddr_type = hcon->dst_type;
1096 bacpy(&smp->slave_ltk->bdaddr, &hcon->dst);
1097 mgmt_new_ltk(hdev, smp->slave_ltk, persistent);
1098 }
6a77083a
JH		 1099
1100 if (smp->link_key) {
e3befab9
JH		 1101 struct link_key *key;
1102 u8 type;
1103
1104 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1105 type = HCI_LK_DEBUG_COMBINATION;
1106 else if (hcon->sec_level == BT_SECURITY_FIPS)
1107 type = HCI_LK_AUTH_COMBINATION_P256;
1108 else
1109 type = HCI_LK_UNAUTH_COMBINATION_P256;
1110
1111 key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst,
1112 smp->link_key, type, 0, &persistent);
1113 if (key) {
1114 mgmt_new_link_key(hdev, key, persistent);
1115
1116 /* Don't keep debug keys around if the relevant
1117 * flag is not set.
1118 */
d7a5a11d 1119 if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) &&
e3befab9
JH		 1120 key->type == HCI_LK_DEBUG_COMBINATION) {
1121 list_del_rcu(&key->list);
1122 kfree_rcu(key, rcu);
1123 }
1124 }
6a77083a
JH		 1125 }
1126}
1127
d3e54a87
JH		 1128static void sc_add_ltk(struct smp_chan *smp)
1129{
1130 struct hci_conn *hcon = smp->conn->hcon;
1131 u8 key_type, auth;
1132
1133 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1134 key_type = SMP_LTK_P256_DEBUG;
1135 else
1136 key_type = SMP_LTK_P256;
1137
1138 if (hcon->pending_sec_level == BT_SECURITY_FIPS)
1139 auth = 1;
1140 else
1141 auth = 0;
1142
d3e54a87
JH		 1143 smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
1144 key_type, auth, smp->tk, smp->enc_key_size,
1145 0, 0);
1146}
1147
6a77083a
JH		 1148static void sc_generate_link_key(struct smp_chan *smp)
1149{
a62da6f1 1150 /* From core spec. Spells out in ASCII as 'lebr'. */
6a77083a
JH		 1151 const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c };
1152
1153 smp->link_key = kzalloc(16, GFP_KERNEL);
1154 if (!smp->link_key)
1155 return;
1156
a62da6f1
JH		 1157 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
1158 /* SALT = 0x00000000000000000000000000000000746D7031 */
1159 const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 };
1160
1161 if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) {
1162 kzfree(smp->link_key);
1163 smp->link_key = NULL;
1164 return;
1165 }
1166 } else {
1167 /* From core spec. Spells out in ASCII as 'tmp1'. */
1168 const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 };
1169
1170 if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) {
1171 kzfree(smp->link_key);
1172 smp->link_key = NULL;
1173 return;
1174 }
6a77083a
JH		 1175 }
1176
1177 if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) {
276812ec 1178 kzfree(smp->link_key);
6a77083a
JH		 1179 smp->link_key = NULL;
1180 return;
1181 }
44f1a7ab
JH		 1182}
1183
b28b4943
JH		 1184static void smp_allow_key_dist(struct smp_chan *smp)
1185{
1186 /* Allow the first expected phase 3 PDU. The rest of the PDUs
1187 * will be allowed in each PDU handler to ensure we receive
1188 * them in the correct order.
1189 */
1190 if (smp->remote_key_dist & SMP_DIST_ENC_KEY)
1191 SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO);
1192 else if (smp->remote_key_dist & SMP_DIST_ID_KEY)
1193 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
1194 else if (smp->remote_key_dist & SMP_DIST_SIGN)
1195 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
1196}
1197
b5ae344d
JH		 1198static void sc_generate_ltk(struct smp_chan *smp)
1199{
a62da6f1 1200 /* From core spec. Spells out in ASCII as 'brle'. */
b5ae344d
JH		 1201 const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 };
1202 struct hci_conn *hcon = smp->conn->hcon;
1203 struct hci_dev *hdev = hcon->hdev;
1204 struct link_key *key;
1205
1206 key = hci_find_link_key(hdev, &hcon->dst);
1207 if (!key) {
1208 BT_ERR("%s No Link Key found to generate LTK", hdev->name);
1209 return;
1210 }
1211
1212 if (key->type == HCI_LK_DEBUG_COMBINATION)
1213 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1214
a62da6f1
JH		 1215 if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
1216 /* SALT = 0x00000000000000000000000000000000746D7032 */
1217 const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 };
1218
1219 if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk))
1220 return;
1221 } else {
1222 /* From core spec. Spells out in ASCII as 'tmp2'. */
1223 const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 };
1224
1225 if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk))
1226 return;
1227 }
b5ae344d
JH		 1228
1229 if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk))
1230 return;
1231
1232 sc_add_ltk(smp);
1233}
1234
d6268e86 1235static void smp_distribute_keys(struct smp_chan *smp)
44f1a7ab
JH		 1236{
1237 struct smp_cmd_pairing *req, *rsp;
86d1407c 1238 struct l2cap_conn *conn = smp->conn;
44f1a7ab
JH		 1239 struct hci_conn *hcon = conn->hcon;
1240 struct hci_dev *hdev = hcon->hdev;
1241 __u8 *keydist;
1242
1243 BT_DBG("conn %p", conn);
1244
44f1a7ab
JH		 1245 rsp = (void *) &smp->prsp[1];
1246
1247 /* The responder sends its keys first */
b28b4943
JH		 1248 if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) {
1249 smp_allow_key_dist(smp);
86d1407c 1250 return;
b28b4943 1251 }
44f1a7ab
JH		 1252
1253 req = (void *) &smp->preq[1];
1254
1255 if (hcon->out) {
1256 keydist = &rsp->init_key_dist;
1257 *keydist &= req->init_key_dist;
1258 } else {
1259 keydist = &rsp->resp_key_dist;
1260 *keydist &= req->resp_key_dist;
1261 }
1262
6a77083a 1263 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
b5ae344d 1264 if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY))
6a77083a 1265 sc_generate_link_key(smp);
b5ae344d
JH		 1266 if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY))
1267 sc_generate_ltk(smp);
6a77083a
JH		 1268
1269 /* Clear the keys which are generated but not distributed */
1270 *keydist &= ~SMP_SC_NO_DIST;
1271 }
1272
44f1a7ab
JH		 1273 BT_DBG("keydist 0x%x", *keydist);
1274
1275 if (*keydist & SMP_DIST_ENC_KEY) {
1276 struct smp_cmd_encrypt_info enc;
1277 struct smp_cmd_master_ident ident;
1278 struct smp_ltk *ltk;
1279 u8 authenticated;
1280 __le16 ediv;
1281 __le64 rand;
1282
1fc62c52
JH		 1283 /* Make sure we generate only the significant amount of
1284 * bytes based on the encryption key size, and set the rest
1285 * of the value to zeroes.
1286 */
1287 get_random_bytes(enc.ltk, smp->enc_key_size);
1288 memset(enc.ltk + smp->enc_key_size, 0,
1289 sizeof(enc.ltk) - smp->enc_key_size);
1290
44f1a7ab
JH		 1291 get_random_bytes(&ediv, sizeof(ediv));
1292 get_random_bytes(&rand, sizeof(rand));
1293
1294 smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
1295
1296 authenticated = hcon->sec_level == BT_SECURITY_HIGH;
1297 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type,
1298 SMP_LTK_SLAVE, authenticated, enc.ltk,
1299 smp->enc_key_size, ediv, rand);
1300 smp->slave_ltk = ltk;
1301
1302 ident.ediv = ediv;
1303 ident.rand = rand;
1304
1305 smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident);
1306
1307 *keydist &= ~SMP_DIST_ENC_KEY;
1308 }
1309
1310 if (*keydist & SMP_DIST_ID_KEY) {
1311 struct smp_cmd_ident_addr_info addrinfo;
1312 struct smp_cmd_ident_info idinfo;
1313
1314 memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk));
1315
1316 smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
1317
1318 /* The hci_conn contains the local identity address
1319 * after the connection has been established.
1320 *
1321 * This is true even when the connection has been
1322 * established using a resolvable random address.
1323 */
1324 bacpy(&addrinfo.bdaddr, &hcon->src);
1325 addrinfo.addr_type = hcon->src_type;
1326
1327 smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
1328 &addrinfo);
1329
1330 *keydist &= ~SMP_DIST_ID_KEY;
1331 }
1332
1333 if (*keydist & SMP_DIST_SIGN) {
1334 struct smp_cmd_sign_info sign;
1335 struct smp_csrk *csrk;
1336
1337 /* Generate a new random key */
1338 get_random_bytes(sign.csrk, sizeof(sign.csrk));
1339
1340 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
1341 if (csrk) {
4cd3928a
JH		 1342 if (hcon->sec_level > BT_SECURITY_MEDIUM)
1343 csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED;
1344 else
1345 csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED;
44f1a7ab
JH		 1346 memcpy(csrk->val, sign.csrk, sizeof(csrk->val));
1347 }
1348 smp->slave_csrk = csrk;
1349
1350 smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
1351
1352 *keydist &= ~SMP_DIST_SIGN;
1353 }
1354
1355 /* If there are still keys to be received wait for them */
b28b4943
JH		 1356 if (smp->remote_key_dist & KEY_DIST_MASK) {
1357 smp_allow_key_dist(smp);
86d1407c 1358 return;
b28b4943 1359 }
44f1a7ab 1360
44f1a7ab
JH		 1361 set_bit(SMP_FLAG_COMPLETE, &smp->flags);
1362 smp_notify_keys(conn);
1363
1364 smp_chan_destroy(conn);
44f1a7ab
JH		 1365}
1366
b68fda68
JH		 1367static void smp_timeout(struct work_struct *work)
1368{
1369 struct smp_chan *smp = container_of(work, struct smp_chan,
1370 security_timer.work);
1371 struct l2cap_conn *conn = smp->conn;
1372
1373 BT_DBG("conn %p", conn);
1374
1e91c29e 1375 hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM);
b68fda68
JH		 1376}
1377
8aab4757
VCG		 1378static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
1379{
5d88cc73 1380 struct l2cap_chan *chan = conn->smp;
8aab4757
VCG		 1381 struct smp_chan *smp;
1382
f1560463 1383 smp = kzalloc(sizeof(*smp), GFP_ATOMIC);
fc75cc86 1384 if (!smp)
8aab4757
VCG		 1385 return NULL;
1386
a4770e11 1387 smp->tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
6a7bd103 1388 if (IS_ERR(smp->tfm_aes)) {
a4770e11 1389 BT_ERR("Unable to create AES crypto context");
276812ec 1390 kzfree(smp);
6a7bd103
JH		 1391 return NULL;
1392 }
1393
71af2f6b 1394 smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
407cecf6
JH		 1395 if (IS_ERR(smp->tfm_cmac)) {
1396 BT_ERR("Unable to create CMAC crypto context");
a4770e11 1397 crypto_free_cipher(smp->tfm_aes);
276812ec 1398 kzfree(smp);
407cecf6
JH		 1399 return NULL;
1400 }
1401
8aab4757 1402 smp->conn = conn;
5d88cc73 1403 chan->data = smp;
8aab4757 1404
b28b4943
JH		 1405 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL);
1406
b68fda68
JH		 1407 INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
1408
8aab4757
VCG		 1409 hci_conn_hold(conn->hcon);
1410
1411 return smp;
1412}
1413
760b018b
JH		 1414static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16])
1415{
1416 struct hci_conn *hcon = smp->conn->hcon;
1417 u8 *na, *nb, a[7], b[7];
1418
1419 if (hcon->out) {
1420 na = smp->prnd;
1421 nb = smp->rrnd;
1422 } else {
1423 na = smp->rrnd;
1424 nb = smp->prnd;
1425 }
1426
1427 memcpy(a, &hcon->init_addr, 6);
1428 memcpy(b, &hcon->resp_addr, 6);
1429 a[6] = hcon->init_addr_type;
1430 b[6] = hcon->resp_addr_type;
1431
1432 return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk);
1433}
1434
38606f14 1435static void sc_dhkey_check(struct smp_chan *smp)
760b018b
JH		 1436{
1437 struct hci_conn *hcon = smp->conn->hcon;
1438 struct smp_cmd_dhkey_check check;
1439 u8 a[7], b[7], *local_addr, *remote_addr;
1440 u8 io_cap[3], r[16];
1441
760b018b
JH		 1442 memcpy(a, &hcon->init_addr, 6);
1443 memcpy(b, &hcon->resp_addr, 6);
1444 a[6] = hcon->init_addr_type;
1445 b[6] = hcon->resp_addr_type;
1446
1447 if (hcon->out) {
1448 local_addr = a;
1449 remote_addr = b;
1450 memcpy(io_cap, &smp->preq[1], 3);
1451 } else {
1452 local_addr = b;
1453 remote_addr = a;
1454 memcpy(io_cap, &smp->prsp[1], 3);
1455 }
1456
dddd3059
JH		 1457 memset(r, 0, sizeof(r));
1458
1459 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
38606f14 1460 put_unaligned_le32(hcon->passkey_notify, r);
760b018b 1461
a29b0733
JH		 1462 if (smp->method == REQ_OOB)
1463 memcpy(r, smp->rr, 16);
1464
760b018b
JH		 1465 smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
1466 local_addr, remote_addr, check.e);
1467
1468 smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check);
dddd3059
JH		 1469}
1470
38606f14
JH		 1471static u8 sc_passkey_send_confirm(struct smp_chan *smp)
1472{
1473 struct l2cap_conn *conn = smp->conn;
1474 struct hci_conn *hcon = conn->hcon;
1475 struct smp_cmd_pairing_confirm cfm;
1476 u8 r;
1477
1478 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1479 r |= 0x80;
1480
1481 get_random_bytes(smp->prnd, sizeof(smp->prnd));
1482
1483 if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r,
1484 cfm.confirm_val))
1485 return SMP_UNSPECIFIED;
1486
1487 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
1488
1489 return 0;
1490}
1491
1492static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op)
1493{
1494 struct l2cap_conn *conn = smp->conn;
1495 struct hci_conn *hcon = conn->hcon;
1496 struct hci_dev *hdev = hcon->hdev;
1497 u8 cfm[16], r;
1498
1499 /* Ignore the PDU if we've already done 20 rounds (0 - 19) */
1500 if (smp->passkey_round >= 20)
1501 return 0;
1502
1503 switch (smp_op) {
1504 case SMP_CMD_PAIRING_RANDOM:
1505 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1506 r |= 0x80;
1507
1508 if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
1509 smp->rrnd, r, cfm))
1510 return SMP_UNSPECIFIED;
1511
1512 if (memcmp(smp->pcnf, cfm, 16))
1513 return SMP_CONFIRM_FAILED;
1514
1515 smp->passkey_round++;
1516
1517 if (smp->passkey_round == 20) {
1518 /* Generate MacKey and LTK */
1519 if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk))
1520 return SMP_UNSPECIFIED;
1521 }
1522
1523 /* The round is only complete when the initiator
1524 * receives pairing random.
1525 */
1526 if (!hcon->out) {
1527 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1528 sizeof(smp->prnd), smp->prnd);
d3e54a87 1529 if (smp->passkey_round == 20)
38606f14 1530 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
d3e54a87 1531 else
38606f14 1532 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
38606f14
JH		 1533 return 0;
1534 }
1535
1536 /* Start the next round */
1537 if (smp->passkey_round != 20)
1538 return sc_passkey_round(smp, 0);
1539
1540 /* Passkey rounds are complete - start DHKey Check */
1541 sc_dhkey_check(smp);
1542 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1543
1544 break;
1545
1546 case SMP_CMD_PAIRING_CONFIRM:
1547 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
1548 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
1549 return 0;
1550 }
1551
1552 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1553
1554 if (hcon->out) {
1555 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1556 sizeof(smp->prnd), smp->prnd);
1557 return 0;
1558 }
1559
1560 return sc_passkey_send_confirm(smp);
1561
1562 case SMP_CMD_PUBLIC_KEY:
1563 default:
1564 /* Initiating device starts the round */
1565 if (!hcon->out)
1566 return 0;
1567
1568 BT_DBG("%s Starting passkey round %u", hdev->name,
1569 smp->passkey_round + 1);
1570
1571 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1572
1573 return sc_passkey_send_confirm(smp);
1574 }
1575
1576 return 0;
1577}
1578
dddd3059
JH		 1579static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey)
1580{
38606f14
JH		 1581 struct l2cap_conn *conn = smp->conn;
1582 struct hci_conn *hcon = conn->hcon;
1583 u8 smp_op;
1584
1585 clear_bit(SMP_FLAG_WAIT_USER, &smp->flags);
1586
dddd3059
JH		 1587 switch (mgmt_op) {
1588 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1589 smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED);
1590 return 0;
1591 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
1592 smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED);
1593 return 0;
38606f14
JH		 1594 case MGMT_OP_USER_PASSKEY_REPLY:
1595 hcon->passkey_notify = le32_to_cpu(passkey);
1596 smp->passkey_round = 0;
1597
1598 if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags))
1599 smp_op = SMP_CMD_PAIRING_CONFIRM;
1600 else
1601 smp_op = 0;
1602
1603 if (sc_passkey_round(smp, smp_op))
1604 return -EIO;
1605
1606 return 0;
dddd3059
JH		 1607 }
1608
d3e54a87
JH		 1609 /* Initiator sends DHKey check first */
1610 if (hcon->out) {
1611 sc_dhkey_check(smp);
1612 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1613 } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) {
1614 sc_dhkey_check(smp);
1615 sc_add_ltk(smp);
1616 }
760b018b
JH		 1617
1618 return 0;
1619}
1620
2b64d153
BG		 1621int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
1622{
b10e8017 1623 struct l2cap_conn *conn = hcon->l2cap_data;
5d88cc73 1624 struct l2cap_chan *chan;
2b64d153
BG		 1625 struct smp_chan *smp;
1626 u32 value;
fc75cc86 1627 int err;
2b64d153
BG		 1628
1629 BT_DBG("");
1630
fc75cc86 1631 if (!conn)
2b64d153
BG		 1632 return -ENOTCONN;
1633
5d88cc73
JH		 1634 chan = conn->smp;
1635 if (!chan)
1636 return -ENOTCONN;
1637
fc75cc86
JH		 1638 l2cap_chan_lock(chan);
1639 if (!chan->data) {
1640 err = -ENOTCONN;
1641 goto unlock;
1642 }
1643
5d88cc73 1644 smp = chan->data;
2b64d153 1645
760b018b
JH		 1646 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1647 err = sc_user_reply(smp, mgmt_op, passkey);
1648 goto unlock;
1649 }
1650
2b64d153
BG		 1651 switch (mgmt_op) {
1652 case MGMT_OP_USER_PASSKEY_REPLY:
1653 value = le32_to_cpu(passkey);
943a732a 1654 memset(smp->tk, 0, sizeof(smp->tk));
2b64d153 1655 BT_DBG("PassKey: %d", value);
943a732a 1656 put_unaligned_le32(value, smp->tk);
2b64d153
BG		 1657 /* Fall Through */
1658 case MGMT_OP_USER_CONFIRM_REPLY:
4a74d658 1659 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
2b64d153
BG		 1660 break;
1661 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1662 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
84794e11 1663 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1664 err = 0;
1665 goto unlock;
2b64d153 1666 default:
84794e11 1667 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
fc75cc86
JH		 1668 err = -EOPNOTSUPP;
1669 goto unlock;
2b64d153
BG		 1670 }
1671
fc75cc86
JH		 1672 err = 0;
1673
2b64d153 1674 /* If it is our turn to send Pairing Confirm, do so now */
1cc61144
JH		 1675 if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
1676 u8 rsp = smp_confirm(smp);
1677 if (rsp)
1678 smp_failure(conn, rsp);
1679 }
2b64d153 1680
fc75cc86
JH		 1681unlock:
1682 l2cap_chan_unlock(chan);
1683 return err;
2b64d153
BG		 1684}
1685
b5ae344d
JH		 1686static void build_bredr_pairing_cmd(struct smp_chan *smp,
1687 struct smp_cmd_pairing *req,
1688 struct smp_cmd_pairing *rsp)
1689{
1690 struct l2cap_conn *conn = smp->conn;
1691 struct hci_dev *hdev = conn->hcon->hdev;
1692 u8 local_dist = 0, remote_dist = 0;
1693
d7a5a11d 1694 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
b5ae344d
JH		 1695 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1696 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1697 }
1698
d7a5a11d 1699 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
b5ae344d
JH		 1700 remote_dist |= SMP_DIST_ID_KEY;
1701
d7a5a11d 1702 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
b5ae344d
JH		 1703 local_dist |= SMP_DIST_ID_KEY;
1704
1705 if (!rsp) {
1706 memset(req, 0, sizeof(*req));
1707
a62da6f1 1708 req->auth_req = SMP_AUTH_CT2;
b5ae344d
JH		 1709 req->init_key_dist = local_dist;
1710 req->resp_key_dist = remote_dist;
e3f6a257 1711 req->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1712
1713 smp->remote_key_dist = remote_dist;
1714
1715 return;
1716 }
1717
1718 memset(rsp, 0, sizeof(*rsp));
1719
a62da6f1 1720 rsp->auth_req = SMP_AUTH_CT2;
e3f6a257 1721 rsp->max_key_size = conn->hcon->enc_key_size;
b5ae344d
JH		 1722 rsp->init_key_dist = req->init_key_dist & remote_dist;
1723 rsp->resp_key_dist = req->resp_key_dist & local_dist;
1724
1725 smp->remote_key_dist = rsp->init_key_dist;
1726}
1727
da85e5e5 1728static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1729{
3158c50c 1730 struct smp_cmd_pairing rsp, *req = (void *) skb->data;
fc75cc86 1731 struct l2cap_chan *chan = conn->smp;
b3c6410b 1732 struct hci_dev *hdev = conn->hcon->hdev;
8aab4757 1733 struct smp_chan *smp;
c7262e71 1734 u8 key_size, auth, sec_level;
8aab4757 1735 int ret;
88ba43b6
AB		 1736
1737 BT_DBG("conn %p", conn);
1738
c46b98be 1739 if (skb->len < sizeof(*req))
38e4a915 1740 return SMP_INVALID_PARAMS;
c46b98be 1741
40bef302 1742 if (conn->hcon->role != HCI_ROLE_SLAVE)
2b64d153
BG		 1743 return SMP_CMD_NOTSUPP;
1744
fc75cc86 1745 if (!chan->data)
8aab4757 1746 smp = smp_chan_create(conn);
fc75cc86 1747 else
5d88cc73 1748 smp = chan->data;
8aab4757 1749
d08fd0e7
AE		 1750 if (!smp)
1751 return SMP_UNSPECIFIED;
d26a2345 1752
c05b9339 1753 /* We didn't start the pairing, so match remote */
0edb14de 1754 auth = req->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1755
d7a5a11d 1756 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 1757 (auth & SMP_AUTH_BONDING))
b3c6410b
JH		 1758 return SMP_PAIRING_NOTSUPP;
1759
d7a5a11d 1760 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1761 return SMP_AUTH_REQUIREMENTS;
1762
1c1def09
VCG		 1763 smp->preq[0] = SMP_CMD_PAIRING_REQ;
1764 memcpy(&smp->preq[1], req, sizeof(*req));
3158c50c 1765 skb_pull(skb, sizeof(*req));
88ba43b6 1766
cb06d366
JH		 1767 /* If the remote side's OOB flag is set it means it has
1768 * successfully received our local OOB data - therefore set the
1769 * flag to indicate that local OOB is in use.
1770 */
58428563
JH		 1771 if (req->oob_flag == SMP_OOB_PRESENT)
1772 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1773
b5ae344d
JH		 1774 /* SMP over BR/EDR requires special treatment */
1775 if (conn->hcon->type == ACL_LINK) {
1776 /* We must have a BR/EDR SC link */
08f63cc5 1777 if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) &&
b7cb93e5 1778 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 1779 return SMP_CROSS_TRANSP_NOT_ALLOWED;
1780
1781 set_bit(SMP_FLAG_SC, &smp->flags);
1782
1783 build_bredr_pairing_cmd(smp, req, &rsp);
1784
a62da6f1
JH		 1785 if (req->auth_req & SMP_AUTH_CT2)
1786 set_bit(SMP_FLAG_CT2, &smp->flags);
1787
b5ae344d
JH		 1788 key_size = min(req->max_key_size, rsp.max_key_size);
1789 if (check_enc_key_size(conn, key_size))
1790 return SMP_ENC_KEY_SIZE;
1791
1792 /* Clear bits which are generated but not distributed */
1793 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1794
1795 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1796 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
1797 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
1798
1799 smp_distribute_keys(smp);
1800 return 0;
1801 }
1802
5e3d3d9b
JH		 1803 build_pairing_cmd(conn, req, &rsp, auth);
1804
a62da6f1 1805 if (rsp.auth_req & SMP_AUTH_SC) {
5e3d3d9b
JH		 1806 set_bit(SMP_FLAG_SC, &smp->flags);
1807
a62da6f1
JH		 1808 if (rsp.auth_req & SMP_AUTH_CT2)
1809 set_bit(SMP_FLAG_CT2, &smp->flags);
1810 }
1811
5be5e275 1812 if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 1813 sec_level = BT_SECURITY_MEDIUM;
1814 else
1815 sec_level = authreq_to_seclevel(auth);
1816
c7262e71
JH		 1817 if (sec_level > conn->hcon->pending_sec_level)
1818 conn->hcon->pending_sec_level = sec_level;
fdde0a26 1819
49c922bb 1820 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1821 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1822 u8 method;
1823
1824 method = get_auth_method(smp, conn->hcon->io_capability,
1825 req->io_capability);
1826 if (method == JUST_WORKS || method == JUST_CFM)
1827 return SMP_AUTH_REQUIREMENTS;
1828 }
1829
3158c50c
VCG		 1830 key_size = min(req->max_key_size, rsp.max_key_size);
1831 if (check_enc_key_size(conn, key_size))
1832 return SMP_ENC_KEY_SIZE;
88ba43b6 1833
e84a6b13 1834 get_random_bytes(smp->prnd, sizeof(smp->prnd));
8aab4757 1835
1c1def09
VCG		 1836 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1837 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
f01ead31 1838
3158c50c 1839 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
3b19146d
JH		 1840
1841 clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
1842
19c5ce9c
JH		 1843 /* Strictly speaking we shouldn't allow Pairing Confirm for the
1844 * SC case, however some implementations incorrectly copy RFU auth
1845 * req bits from our security request, which may create a false
1846 * positive SC enablement.
1847 */
1848 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1849
3b19146d
JH		 1850 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1851 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1852 /* Clear bits which are generated but not distributed */
1853 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1854 /* Wait for Public Key from Initiating Device */
1855 return 0;
3b19146d 1856 }
da85e5e5 1857
2b64d153
BG		 1858 /* Request setup of TK */
1859 ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
1860 if (ret)
1861 return SMP_UNSPECIFIED;
1862
da85e5e5 1863 return 0;
88ba43b6
AB		 1864}
1865
3b19146d
JH		 1866static u8 sc_send_public_key(struct smp_chan *smp)
1867{
70157ef5
JH		 1868 struct hci_dev *hdev = smp->conn->hcon->hdev;
1869
3b19146d
JH		 1870 BT_DBG("");
1871
1a8bab4f 1872 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
33d0c030
MH		 1873 struct l2cap_chan *chan = hdev->smp_data;
1874 struct smp_dev *smp_dev;
1875
1876 if (!chan || !chan->data)
1877 return SMP_UNSPECIFIED;
1878
1879 smp_dev = chan->data;
1880
1881 memcpy(smp->local_pk, smp_dev->local_pk, 64);
1882 memcpy(smp->local_sk, smp_dev->local_sk, 32);
fb334fee 1883 memcpy(smp->lr, smp_dev->local_rand, 16);
33d0c030
MH		 1884
1885 if (smp_dev->debug_key)
1886 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1887
1888 goto done;
1889 }
1890
d7a5a11d 1891 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
70157ef5
JH		 1892 BT_DBG("Using debug keys");
1893 memcpy(smp->local_pk, debug_pk, 64);
1894 memcpy(smp->local_sk, debug_sk, 32);
1895 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1896 } else {
1897 while (true) {
1898 /* Generate local key pair for Secure Connections */
1899 if (!ecc_make_key(smp->local_pk, smp->local_sk))
1900 return SMP_UNSPECIFIED;
6c0dcc50 1901
70157ef5
JH		 1902 /* This is unlikely, but we need to check that
1903 * we didn't accidentially generate a debug key.
1904 */
1905 if (memcmp(smp->local_sk, debug_sk, 32))
1906 break;
1907 }
6c0dcc50 1908 }
3b19146d 1909
33d0c030 1910done:
c7a3d57d 1911 SMP_DBG("Local Public Key X: %32phN", smp->local_pk);
8e4e2ee5 1912 SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32);
c7a3d57d 1913 SMP_DBG("Local Private Key: %32phN", smp->local_sk);
3b19146d
JH		 1914
1915 smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk);
1916
1917 return 0;
1918}
1919
da85e5e5 1920static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 1921{
3158c50c 1922 struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
5d88cc73
JH		 1923 struct l2cap_chan *chan = conn->smp;
1924 struct smp_chan *smp = chan->data;
0edb14de 1925 struct hci_dev *hdev = conn->hcon->hdev;
3a7dbfb8 1926 u8 key_size, auth;
7d24ddcc 1927 int ret;
88ba43b6
AB		 1928
1929 BT_DBG("conn %p", conn);
1930
c46b98be 1931 if (skb->len < sizeof(*rsp))
38e4a915 1932 return SMP_INVALID_PARAMS;
c46b98be 1933
40bef302 1934 if (conn->hcon->role != HCI_ROLE_MASTER)
2b64d153
BG		 1935 return SMP_CMD_NOTSUPP;
1936
3158c50c
VCG		 1937 skb_pull(skb, sizeof(*rsp));
1938
1c1def09 1939 req = (void *) &smp->preq[1];
da85e5e5 1940
3158c50c
VCG		 1941 key_size = min(req->max_key_size, rsp->max_key_size);
1942 if (check_enc_key_size(conn, key_size))
1943 return SMP_ENC_KEY_SIZE;
1944
0edb14de 1945 auth = rsp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 1946
d7a5a11d 1947 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 1948 return SMP_AUTH_REQUIREMENTS;
1949
cb06d366
JH		 1950 /* If the remote side's OOB flag is set it means it has
1951 * successfully received our local OOB data - therefore set the
1952 * flag to indicate that local OOB is in use.
1953 */
58428563
JH		 1954 if (rsp->oob_flag == SMP_OOB_PRESENT)
1955 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1956
b5ae344d
JH		 1957 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1958 memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
1959
1960 /* Update remote key distribution in case the remote cleared
1961 * some bits that we had enabled in our request.
1962 */
1963 smp->remote_key_dist &= rsp->resp_key_dist;
1964
a62da6f1
JH		 1965 if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2))
1966 set_bit(SMP_FLAG_CT2, &smp->flags);
1967
b5ae344d
JH		 1968 /* For BR/EDR this means we're done and can start phase 3 */
1969 if (conn->hcon->type == ACL_LINK) {
1970 /* Clear bits which are generated but not distributed */
1971 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1972 smp_distribute_keys(smp);
1973 return 0;
1974 }
1975
65668776
JH		 1976 if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC))
1977 set_bit(SMP_FLAG_SC, &smp->flags);
d2eb9e10
JH		 1978 else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH)
1979 conn->hcon->pending_sec_level = BT_SECURITY_HIGH;
65668776 1980
49c922bb 1981 /* If we need MITM check that it can be achieved */
2ed8f65c
JH		 1982 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1983 u8 method;
1984
1985 method = get_auth_method(smp, req->io_capability,
1986 rsp->io_capability);
1987 if (method == JUST_WORKS || method == JUST_CFM)
1988 return SMP_AUTH_REQUIREMENTS;
1989 }
1990
e84a6b13 1991 get_random_bytes(smp->prnd, sizeof(smp->prnd));
7d24ddcc 1992
fdcc4bec
JH		 1993 /* Update remote key distribution in case the remote cleared
1994 * some bits that we had enabled in our request.
1995 */
1996 smp->remote_key_dist &= rsp->resp_key_dist;
1997
3b19146d
JH		 1998 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1999 /* Clear bits which are generated but not distributed */
2000 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
2001 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
2002 return sc_send_public_key(smp);
2003 }
2004
c05b9339 2005 auth |= req->auth_req;
2b64d153 2006
476585ec 2007 ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
2b64d153
BG		 2008 if (ret)
2009 return SMP_UNSPECIFIED;
2010
4a74d658 2011 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
2b64d153
BG		 2012
2013 /* Can't compose response until we have been confirmed */
4a74d658 2014 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2015 return smp_confirm(smp);
da85e5e5
VCG		 2016
2017 return 0;
88ba43b6
AB		 2018}
2019
dcee2b32
JH		 2020static u8 sc_check_confirm(struct smp_chan *smp)
2021{
2022 struct l2cap_conn *conn = smp->conn;
2023
2024 BT_DBG("");
2025
38606f14
JH		 2026 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2027 return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM);
2028
dcee2b32
JH		 2029 if (conn->hcon->out) {
2030 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2031 smp->prnd);
2032 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2033 }
2034
2035 return 0;
2036}
2037
19c5ce9c
JH		 2038/* Work-around for some implementations that incorrectly copy RFU bits
2039 * from our security request and thereby create the impression that
2040 * we're doing SC when in fact the remote doesn't support it.
2041 */
2042static int fixup_sc_false_positive(struct smp_chan *smp)
2043{
2044 struct l2cap_conn *conn = smp->conn;
2045 struct hci_conn *hcon = conn->hcon;
2046 struct hci_dev *hdev = hcon->hdev;
2047 struct smp_cmd_pairing *req, *rsp;
2048 u8 auth;
2049
2050 /* The issue is only observed when we're in slave role */
2051 if (hcon->out)
2052 return SMP_UNSPECIFIED;
2053
2054 if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) {
2055 BT_ERR("Refusing SMP SC -> legacy fallback in SC-only mode");
2056 return SMP_UNSPECIFIED;
2057 }
2058
2059 BT_ERR("Trying to fall back to legacy SMP");
2060
2061 req = (void *) &smp->preq[1];
2062 rsp = (void *) &smp->prsp[1];
2063
2064 /* Rebuild key dist flags which may have been cleared for SC */
2065 smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist);
2066
2067 auth = req->auth_req & AUTH_REQ_MASK(hdev);
2068
2069 if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) {
2070 BT_ERR("Failed to fall back to legacy SMP");
2071 return SMP_UNSPECIFIED;
2072 }
2073
2074 clear_bit(SMP_FLAG_SC, &smp->flags);
2075
2076 return 0;
2077}
2078
da85e5e5 2079static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2080{
5d88cc73
JH		 2081 struct l2cap_chan *chan = conn->smp;
2082 struct smp_chan *smp = chan->data;
7d24ddcc 2083
88ba43b6
AB		 2084 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
2085
c46b98be 2086 if (skb->len < sizeof(smp->pcnf))
38e4a915 2087 return SMP_INVALID_PARAMS;
c46b98be 2088
1c1def09
VCG		 2089 memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
2090 skb_pull(skb, sizeof(smp->pcnf));
88ba43b6 2091
19c5ce9c
JH		 2092 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2093 int ret;
2094
2095 /* Public Key exchange must happen before any other steps */
2096 if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags))
2097 return sc_check_confirm(smp);
2098
2099 BT_ERR("Unexpected SMP Pairing Confirm");
2100
2101 ret = fixup_sc_false_positive(smp);
2102 if (ret)
2103 return ret;
2104 }
dcee2b32 2105
b28b4943 2106 if (conn->hcon->out) {
943a732a
JH		 2107 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2108 smp->prnd);
b28b4943
JH		 2109 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2110 return 0;
2111 }
2112
2113 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
1cc61144 2114 return smp_confirm(smp);
983f9814
MH		 2115
2116 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
da85e5e5
VCG		 2117
2118 return 0;
88ba43b6
AB		 2119}
2120
da85e5e5 2121static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6 2122{
5d88cc73
JH		 2123 struct l2cap_chan *chan = conn->smp;
2124 struct smp_chan *smp = chan->data;
191dc7fe
JH		 2125 struct hci_conn *hcon = conn->hcon;
2126 u8 *pkax, *pkbx, *na, *nb;
2127 u32 passkey;
2128 int err;
7d24ddcc 2129
8aab4757 2130 BT_DBG("conn %p", conn);
3158c50c 2131
c46b98be 2132 if (skb->len < sizeof(smp->rrnd))
38e4a915 2133 return SMP_INVALID_PARAMS;
c46b98be 2134
943a732a 2135 memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
8aab4757 2136 skb_pull(skb, sizeof(smp->rrnd));
e7e62c85 2137
191dc7fe
JH		 2138 if (!test_bit(SMP_FLAG_SC, &smp->flags))
2139 return smp_random(smp);
2140
580039e8
JH		 2141 if (hcon->out) {
2142 pkax = smp->local_pk;
2143 pkbx = smp->remote_pk;
2144 na = smp->prnd;
2145 nb = smp->rrnd;
2146 } else {
2147 pkax = smp->remote_pk;
2148 pkbx = smp->local_pk;
2149 na = smp->rrnd;
2150 nb = smp->prnd;
2151 }
2152
a29b0733
JH		 2153 if (smp->method == REQ_OOB) {
2154 if (!hcon->out)
2155 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2156 sizeof(smp->prnd), smp->prnd);
2157 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2158 goto mackey_and_ltk;
2159 }
2160
38606f14
JH		 2161 /* Passkey entry has special treatment */
2162 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2163 return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
2164
191dc7fe
JH		 2165 if (hcon->out) {
2166 u8 cfm[16];
2167
2168 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
2169 smp->rrnd, 0, cfm);
2170 if (err)
2171 return SMP_UNSPECIFIED;
2172
2173 if (memcmp(smp->pcnf, cfm, 16))
2174 return SMP_CONFIRM_FAILED;
191dc7fe
JH		 2175 } else {
2176 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2177 smp->prnd);
2178 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
191dc7fe
JH		 2179 }
2180
a29b0733 2181mackey_and_ltk:
760b018b
JH		 2182 /* Generate MacKey and LTK */
2183 err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
2184 if (err)
2185 return SMP_UNSPECIFIED;
2186
a29b0733 2187 if (smp->method == JUST_WORKS || smp->method == REQ_OOB) {
dddd3059 2188 if (hcon->out) {
38606f14 2189 sc_dhkey_check(smp);
dddd3059
JH		 2190 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2191 }
2192 return 0;
2193 }
2194
38606f14
JH		 2195 err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
2196 if (err)
2197 return SMP_UNSPECIFIED;
2198
2199 err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type,
2200 hcon->dst_type, passkey, 0);
191dc7fe
JH		 2201 if (err)
2202 return SMP_UNSPECIFIED;
2203
38606f14
JH		 2204 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2205
191dc7fe 2206 return 0;
88ba43b6
AB		 2207}
2208
f81cd823 2209static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
988c5997 2210{
c9839a11 2211 struct smp_ltk *key;
988c5997
VCG		 2212 struct hci_conn *hcon = conn->hcon;
2213
f3a73d97 2214 key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role);
988c5997 2215 if (!key)
f81cd823 2216 return false;
988c5997 2217
a6f7833c 2218 if (smp_ltk_sec_level(key) < sec_level)
f81cd823 2219 return false;
4dab7864 2220
51a8efd7 2221 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
f81cd823 2222 return true;
988c5997 2223
8b76ce34 2224 hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size);
c9839a11 2225 hcon->enc_key_size = key->enc_size;
988c5997 2226
fe59a05f
JH		 2227 /* We never store STKs for master role, so clear this flag */
2228 clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
2229
f81cd823 2230 return true;
988c5997 2231}
f1560463 2232
35dc6f83
JH		 2233bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
2234 enum smp_key_pref key_pref)
854f4727
JH		 2235{
2236 if (sec_level == BT_SECURITY_LOW)
2237 return true;
2238
35dc6f83
JH		 2239 /* If we're encrypted with an STK but the caller prefers using
2240 * LTK claim insufficient security. This way we allow the
2241 * connection to be re-encrypted with an LTK, even if the LTK
2242 * provides the same level of security. Only exception is if we
2243 * don't have an LTK (e.g. because of key distribution bits).
9ab65d60 2244 */
35dc6f83
JH		 2245 if (key_pref == SMP_USE_LTK &&
2246 test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
f3a73d97 2247 hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role))
9ab65d60
JH		 2248 return false;
2249
854f4727
JH		 2250 if (hcon->sec_level >= sec_level)
2251 return true;
2252
2253 return false;
2254}
2255
da85e5e5 2256static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
88ba43b6
AB		 2257{
2258 struct smp_cmd_security_req *rp = (void *) skb->data;
2259 struct smp_cmd_pairing cp;
f1cb9af5 2260 struct hci_conn *hcon = conn->hcon;
0edb14de 2261 struct hci_dev *hdev = hcon->hdev;
8aab4757 2262 struct smp_chan *smp;
c05b9339 2263 u8 sec_level, auth;
88ba43b6
AB		 2264
2265 BT_DBG("conn %p", conn);
2266
c46b98be 2267 if (skb->len < sizeof(*rp))
38e4a915 2268 return SMP_INVALID_PARAMS;
c46b98be 2269
40bef302 2270 if (hcon->role != HCI_ROLE_MASTER)
86ca9eac
JH		 2271 return SMP_CMD_NOTSUPP;
2272
0edb14de 2273 auth = rp->auth_req & AUTH_REQ_MASK(hdev);
c05b9339 2274
d7a5a11d 2275 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
903b71c7
JH		 2276 return SMP_AUTH_REQUIREMENTS;
2277
5be5e275 2278 if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
1afc2a1a
JH		 2279 sec_level = BT_SECURITY_MEDIUM;
2280 else
2281 sec_level = authreq_to_seclevel(auth);
2282
35dc6f83 2283 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
854f4727
JH		 2284 return 0;
2285
c7262e71
JH		 2286 if (sec_level > hcon->pending_sec_level)
2287 hcon->pending_sec_level = sec_level;
feb45eb5 2288
4dab7864 2289 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
988c5997
VCG		 2290 return 0;
2291
8aab4757 2292 smp = smp_chan_create(conn);
c29d2444
JH		 2293 if (!smp)
2294 return SMP_UNSPECIFIED;
d26a2345 2295
d7a5a11d 2296 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
c05b9339 2297 (auth & SMP_AUTH_BONDING))
616d55be
JH		 2298 return SMP_PAIRING_NOTSUPP;
2299
88ba43b6 2300 skb_pull(skb, sizeof(*rp));
88ba43b6 2301
da85e5e5 2302 memset(&cp, 0, sizeof(cp));
c05b9339 2303 build_pairing_cmd(conn, &cp, NULL, auth);
88ba43b6 2304
1c1def09
VCG		 2305 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2306 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2307
88ba43b6 2308 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2309 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
f1cb9af5 2310
da85e5e5 2311 return 0;
88ba43b6
AB		 2312}
2313
cc110922 2314int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
eb492e01 2315{
cc110922 2316 struct l2cap_conn *conn = hcon->l2cap_data;
c68b7f12 2317 struct l2cap_chan *chan;
0a66cf20 2318 struct smp_chan *smp;
2b64d153 2319 __u8 authreq;
fc75cc86 2320 int ret;
eb492e01 2321
3a0259bb
VCG		 2322 BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
2323
0a66cf20
JH		 2324 /* This may be NULL if there's an unexpected disconnection */
2325 if (!conn)
2326 return 1;
2327
d7a5a11d 2328 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED))
2e65c9d2
AG		 2329 return 1;
2330
35dc6f83 2331 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
eb492e01 2332 return 1;
f1cb9af5 2333
c7262e71
JH		 2334 if (sec_level > hcon->pending_sec_level)
2335 hcon->pending_sec_level = sec_level;
2336
40bef302 2337 if (hcon->role == HCI_ROLE_MASTER)
c7262e71
JH		 2338 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
2339 return 0;
d26a2345 2340
d8949aad
JH		 2341 chan = conn->smp;
2342 if (!chan) {
2343 BT_ERR("SMP security requested but not available");
2344 return 1;
2345 }
2346
fc75cc86
JH		 2347 l2cap_chan_lock(chan);
2348
2349 /* If SMP is already in progress ignore this request */
2350 if (chan->data) {
2351 ret = 0;
2352 goto unlock;
2353 }
d26a2345 2354
8aab4757 2355 smp = smp_chan_create(conn);
fc75cc86
JH		 2356 if (!smp) {
2357 ret = 1;
2358 goto unlock;
2359 }
2b64d153
BG		 2360
2361 authreq = seclevel_to_authreq(sec_level);
d26a2345 2362
a62da6f1 2363 if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) {
d2eb9e10 2364 authreq |= SMP_AUTH_SC;
a62da6f1
JH		 2365 if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED))
2366 authreq |= SMP_AUTH_CT2;
2367 }
d2eb9e10 2368
79897d20
JH		 2369 /* Require MITM if IO Capability allows or the security level
2370 * requires it.
2e233644 2371 */
79897d20 2372 if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
c7262e71 2373 hcon->pending_sec_level > BT_SECURITY_MEDIUM)
2e233644
JH		 2374 authreq |= SMP_AUTH_MITM;
2375
40bef302 2376 if (hcon->role == HCI_ROLE_MASTER) {
d26a2345 2377 struct smp_cmd_pairing cp;
f01ead31 2378
2b64d153 2379 build_pairing_cmd(conn, &cp, NULL, authreq);
1c1def09
VCG		 2380 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2381 memcpy(&smp->preq[1], &cp, sizeof(cp));
f01ead31 2382
eb492e01 2383 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
b28b4943 2384 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
eb492e01
AB		 2385 } else {
2386 struct smp_cmd_security_req cp;
2b64d153 2387 cp.auth_req = authreq;
eb492e01 2388 smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
b28b4943 2389 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ);
eb492e01
AB		 2390 }
2391
4a74d658 2392 set_bit(SMP_FLAG_INITIATOR, &smp->flags);
fc75cc86 2393 ret = 0;
edca792c 2394
fc75cc86
JH		 2395unlock:
2396 l2cap_chan_unlock(chan);
2397 return ret;
eb492e01
AB		 2398}
2399
c81d555a
JH		 2400void smp_cancel_pairing(struct hci_conn *hcon)
2401{
2402 struct l2cap_conn *conn = hcon->l2cap_data;
2403 struct l2cap_chan *chan;
2404 struct smp_chan *smp;
2405
2406 if (!conn)
2407 return;
2408
2409 chan = conn->smp;
2410 if (!chan)
2411 return;
2412
2413 l2cap_chan_lock(chan);
2414
2415 smp = chan->data;
2416 if (smp) {
2417 if (test_bit(SMP_FLAG_COMPLETE, &smp->flags))
2418 smp_failure(conn, 0);
2419 else
2420 smp_failure(conn, SMP_UNSPECIFIED);
2421 }
2422
2423 l2cap_chan_unlock(chan);
2424}
2425
7034b911
VCG		 2426static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
2427{
16b90839 2428 struct smp_cmd_encrypt_info *rp = (void *) skb->data;
5d88cc73
JH		 2429 struct l2cap_chan *chan = conn->smp;
2430 struct smp_chan *smp = chan->data;
16b90839 2431
c46b98be
JH		 2432 BT_DBG("conn %p", conn);
2433
2434 if (skb->len < sizeof(*rp))
38e4a915 2435 return SMP_INVALID_PARAMS;
c46b98be 2436
b28b4943 2437 SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT);
6131ddc8 2438
16b90839
VCG		 2439 skb_pull(skb, sizeof(*rp));
2440
1c1def09 2441 memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
16b90839 2442
7034b911
VCG		 2443 return 0;
2444}
2445
2446static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
2447{
16b90839 2448 struct smp_cmd_master_ident *rp = (void *) skb->data;
5d88cc73
JH		 2449 struct l2cap_chan *chan = conn->smp;
2450 struct smp_chan *smp = chan->data;
c9839a11
VCG		 2451 struct hci_dev *hdev = conn->hcon->hdev;
2452 struct hci_conn *hcon = conn->hcon;
23d0e128 2453 struct smp_ltk *ltk;
c9839a11 2454 u8 authenticated;
16b90839 2455
c46b98be
JH		 2456 BT_DBG("conn %p", conn);
2457
2458 if (skb->len < sizeof(*rp))
38e4a915 2459 return SMP_INVALID_PARAMS;
c46b98be 2460
9747a9f3
JH		 2461 /* Mark the information as received */
2462 smp->remote_key_dist &= ~SMP_DIST_ENC_KEY;
2463
b28b4943
JH		 2464 if (smp->remote_key_dist & SMP_DIST_ID_KEY)
2465 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
196332f5
JH		 2466 else if (smp->remote_key_dist & SMP_DIST_SIGN)
2467 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
b28b4943 2468
16b90839 2469 skb_pull(skb, sizeof(*rp));
7034b911 2470
ce39fb4e 2471 authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
2ceba539 2472 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
23d0e128
JH		 2473 authenticated, smp->tk, smp->enc_key_size,
2474 rp->ediv, rp->rand);
2475 smp->ltk = ltk;
c6e81e9a 2476 if (!(smp->remote_key_dist & KEY_DIST_MASK))
d6268e86 2477 smp_distribute_keys(smp);
7034b911
VCG		 2478
2479 return 0;
2480}
2481
fd349c02
JH		 2482static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
2483{
2484 struct smp_cmd_ident_info *info = (void *) skb->data;
5d88cc73
JH		 2485 struct l2cap_chan *chan = conn->smp;
2486 struct smp_chan *smp = chan->data;
fd349c02
JH		 2487
2488 BT_DBG("");
2489
2490 if (skb->len < sizeof(*info))
38e4a915 2491 return SMP_INVALID_PARAMS;
fd349c02 2492
b28b4943 2493 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO);
6131ddc8 2494
fd349c02
JH		 2495 skb_pull(skb, sizeof(*info));
2496
2497 memcpy(smp->irk, info->irk, 16);
2498
2499 return 0;
2500}
2501
2502static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
2503 struct sk_buff *skb)
2504{
2505 struct smp_cmd_ident_addr_info *info = (void *) skb->data;
5d88cc73
JH		 2506 struct l2cap_chan *chan = conn->smp;
2507 struct smp_chan *smp = chan->data;
fd349c02
JH		 2508 struct hci_conn *hcon = conn->hcon;
2509 bdaddr_t rpa;
2510
2511 BT_DBG("");
2512
2513 if (skb->len < sizeof(*info))
38e4a915 2514 return SMP_INVALID_PARAMS;
fd349c02 2515
9747a9f3
JH		 2516 /* Mark the information as received */
2517 smp->remote_key_dist &= ~SMP_DIST_ID_KEY;
2518
b28b4943
JH		 2519 if (smp->remote_key_dist & SMP_DIST_SIGN)
2520 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
2521
fd349c02
JH		 2522 skb_pull(skb, sizeof(*info));
2523
a9a58f86
JH		 2524 /* Strictly speaking the Core Specification (4.1) allows sending
2525 * an empty address which would force us to rely on just the IRK
2526 * as "identity information". However, since such
2527 * implementations are not known of and in order to not over
2528 * complicate our implementation, simply pretend that we never
2529 * received an IRK for such a device.
e12af489
JH		 2530 *
2531 * The Identity Address must also be a Static Random or Public
2532 * Address, which hci_is_identity_address() checks for.
a9a58f86 2533 */
e12af489
JH		 2534 if (!bacmp(&info->bdaddr, BDADDR_ANY) ||
2535 !hci_is_identity_address(&info->bdaddr, info->addr_type)) {
a9a58f86 2536 BT_ERR("Ignoring IRK with no identity address");
31dd624e 2537 goto distribute;
a9a58f86
JH		 2538 }
2539
fd349c02
JH		 2540 bacpy(&smp->id_addr, &info->bdaddr);
2541 smp->id_addr_type = info->addr_type;
2542
2543 if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type))
2544 bacpy(&rpa, &hcon->dst);
2545 else
2546 bacpy(&rpa, BDADDR_ANY);
2547
23d0e128
JH		 2548 smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr,
2549 smp->id_addr_type, smp->irk, &rpa);
fd349c02 2550
31dd624e 2551distribute:
c6e81e9a
JH		 2552 if (!(smp->remote_key_dist & KEY_DIST_MASK))
2553 smp_distribute_keys(smp);
fd349c02
JH		 2554
2555 return 0;
2556}
2557
7ee4ea36
MH		 2558static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
2559{
2560 struct smp_cmd_sign_info *rp = (void *) skb->data;
5d88cc73
JH		 2561 struct l2cap_chan *chan = conn->smp;
2562 struct smp_chan *smp = chan->data;
7ee4ea36
MH		 2563 struct smp_csrk *csrk;
2564
2565 BT_DBG("conn %p", conn);
2566
2567 if (skb->len < sizeof(*rp))
38e4a915 2568 return SMP_INVALID_PARAMS;
7ee4ea36 2569
7ee4ea36
MH		 2570 /* Mark the information as received */
2571 smp->remote_key_dist &= ~SMP_DIST_SIGN;
2572
2573 skb_pull(skb, sizeof(*rp));
2574
7ee4ea36
MH		 2575 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
2576 if (csrk) {
4cd3928a
JH		 2577 if (conn->hcon->sec_level > BT_SECURITY_MEDIUM)
2578 csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED;
2579 else
2580 csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED;
7ee4ea36
MH		 2581 memcpy(csrk->val, rp->csrk, sizeof(csrk->val));
2582 }
2583 smp->csrk = csrk;
d6268e86 2584 smp_distribute_keys(smp);
7ee4ea36
MH		 2585
2586 return 0;
2587}
2588
5e3d3d9b
JH		 2589static u8 sc_select_method(struct smp_chan *smp)
2590{
2591 struct l2cap_conn *conn = smp->conn;
2592 struct hci_conn *hcon = conn->hcon;
2593 struct smp_cmd_pairing *local, *remote;
2594 u8 local_mitm, remote_mitm, local_io, remote_io, method;
2595
1a8bab4f
JH		 2596 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) ||
2597 test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags))
a29b0733
JH		 2598 return REQ_OOB;
2599
5e3d3d9b
JH		 2600 /* The preq/prsp contain the raw Pairing Request/Response PDUs
2601 * which are needed as inputs to some crypto functions. To get
2602 * the "struct smp_cmd_pairing" from them we need to skip the
2603 * first byte which contains the opcode.
2604 */
2605 if (hcon->out) {
2606 local = (void *) &smp->preq[1];
2607 remote = (void *) &smp->prsp[1];
2608 } else {
2609 local = (void *) &smp->prsp[1];
2610 remote = (void *) &smp->preq[1];
2611 }
2612
2613 local_io = local->io_capability;
2614 remote_io = remote->io_capability;
2615
2616 local_mitm = (local->auth_req & SMP_AUTH_MITM);
2617 remote_mitm = (remote->auth_req & SMP_AUTH_MITM);
2618
2619 /* If either side wants MITM, look up the method from the table,
2620 * otherwise use JUST WORKS.
2621 */
2622 if (local_mitm || remote_mitm)
2623 method = get_auth_method(smp, local_io, remote_io);
2624 else
2625 method = JUST_WORKS;
2626
2627 /* Don't confirm locally initiated pairing attempts */
2628 if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
2629 method = JUST_WORKS;
2630
2631 return method;
2632}
2633
d8f8edbe
JH		 2634static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
2635{
2636 struct smp_cmd_public_key *key = (void *) skb->data;
2637 struct hci_conn *hcon = conn->hcon;
2638 struct l2cap_chan *chan = conn->smp;
2639 struct smp_chan *smp = chan->data;
5e3d3d9b 2640 struct hci_dev *hdev = hcon->hdev;
cbbbe3e2 2641 struct smp_cmd_pairing_confirm cfm;
d8f8edbe
JH		 2642 int err;
2643
2644 BT_DBG("conn %p", conn);
2645
2646 if (skb->len < sizeof(*key))
2647 return SMP_INVALID_PARAMS;
2648
2649 memcpy(smp->remote_pk, key, 64);
2650
a8ca617c
JH		 2651 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {
2652 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
2653 smp->rr, 0, cfm.confirm_val);
2654 if (err)
2655 return SMP_UNSPECIFIED;
2656
2657 if (memcmp(cfm.confirm_val, smp->pcnf, 16))
2658 return SMP_CONFIRM_FAILED;
2659 }
2660
d8f8edbe
JH		 2661 /* Non-initiating device sends its public key after receiving
2662 * the key from the initiating device.
2663 */
2664 if (!hcon->out) {
2665 err = sc_send_public_key(smp);
2666 if (err)
2667 return err;
2668 }
2669
c7a3d57d 2670 SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk);
e091526d 2671 SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32);
d8f8edbe
JH		 2672
2673 if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey))
2674 return SMP_UNSPECIFIED;
2675
c7a3d57d 2676 SMP_DBG("DHKey %32phN", smp->dhkey);
d8f8edbe
JH		 2677
2678 set_bit(SMP_FLAG_REMOTE_PK, &smp->flags);
2679
5e3d3d9b
JH		 2680 smp->method = sc_select_method(smp);
2681
2682 BT_DBG("%s selected method 0x%02x", hdev->name, smp->method);
2683
2684 /* JUST_WORKS and JUST_CFM result in an unauthenticated key */
2685 if (smp->method == JUST_WORKS || smp->method == JUST_CFM)
2686 hcon->pending_sec_level = BT_SECURITY_MEDIUM;
2687 else
2688 hcon->pending_sec_level = BT_SECURITY_FIPS;
2689
aeb7d461
JH		 2690 if (!memcmp(debug_pk, smp->remote_pk, 64))
2691 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
2692
38606f14
JH		 2693 if (smp->method == DSP_PASSKEY) {
2694 get_random_bytes(&hcon->passkey_notify,
2695 sizeof(hcon->passkey_notify));
2696 hcon->passkey_notify %= 1000000;
2697 hcon->passkey_entered = 0;
2698 smp->passkey_round = 0;
2699 if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type,
2700 hcon->dst_type,
2701 hcon->passkey_notify,
2702 hcon->passkey_entered))
2703 return SMP_UNSPECIFIED;
2704 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2705 return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
2706 }
2707
94ea7257 2708 if (smp->method == REQ_OOB) {
a29b0733
JH		 2709 if (hcon->out)
2710 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2711 sizeof(smp->prnd), smp->prnd);
2712
2713 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2714
2715 return 0;
2716 }
2717
38606f14
JH		 2718 if (hcon->out)
2719 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2720
2721 if (smp->method == REQ_PASSKEY) {
2722 if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type,
2723 hcon->dst_type))
2724 return SMP_UNSPECIFIED;
2725 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2726 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2727 return 0;
2728 }
2729
cbbbe3e2
JH		 2730 /* The Initiating device waits for the non-initiating device to
2731 * send the confirm value.
2732 */
2733 if (conn->hcon->out)
2734 return 0;
2735
2736 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd,
2737 0, cfm.confirm_val);
2738 if (err)
2739 return SMP_UNSPECIFIED;
2740
2741 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
2742 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2743
d8f8edbe
JH		 2744 return 0;
2745}
2746
6433a9a2
JH		 2747static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb)
2748{
2749 struct smp_cmd_dhkey_check *check = (void *) skb->data;
2750 struct l2cap_chan *chan = conn->smp;
2751 struct hci_conn *hcon = conn->hcon;
2752 struct smp_chan *smp = chan->data;
2753 u8 a[7], b[7], *local_addr, *remote_addr;
2754 u8 io_cap[3], r[16], e[16];
2755 int err;
2756
2757 BT_DBG("conn %p", conn);
2758
2759 if (skb->len < sizeof(*check))
2760 return SMP_INVALID_PARAMS;
2761
2762 memcpy(a, &hcon->init_addr, 6);
2763 memcpy(b, &hcon->resp_addr, 6);
2764 a[6] = hcon->init_addr_type;
2765 b[6] = hcon->resp_addr_type;
2766
2767 if (hcon->out) {
2768 local_addr = a;
2769 remote_addr = b;
2770 memcpy(io_cap, &smp->prsp[1], 3);
2771 } else {
2772 local_addr = b;
2773 remote_addr = a;
2774 memcpy(io_cap, &smp->preq[1], 3);
2775 }
2776
2777 memset(r, 0, sizeof(r));
2778
38606f14
JH		 2779 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2780 put_unaligned_le32(hcon->passkey_notify, r);
882fafad
JH		 2781 else if (smp->method == REQ_OOB)
2782 memcpy(r, smp->lr, 16);
38606f14 2783
6433a9a2
JH		 2784 err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r,
2785 io_cap, remote_addr, local_addr, e);
2786 if (err)
2787 return SMP_UNSPECIFIED;
2788
2789 if (memcmp(check->e, e, 16))
2790 return SMP_DHKEY_CHECK_FAILED;
2791
d3e54a87
JH		 2792 if (!hcon->out) {
2793 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
2794 set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags);
2795 return 0;
2796 }
d378a2d7 2797
d3e54a87
JH		 2798 /* Slave sends DHKey check as response to master */
2799 sc_dhkey_check(smp);
2800 }
d378a2d7 2801
d3e54a87 2802 sc_add_ltk(smp);
6433a9a2
JH		 2803
2804 if (hcon->out) {
8b76ce34 2805 hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size);
6433a9a2
JH		 2806 hcon->enc_key_size = smp->enc_key_size;
2807 }
2808
2809 return 0;
2810}
2811
1408bb6e
JH		 2812static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
2813 struct sk_buff *skb)
2814{
2815 struct smp_cmd_keypress_notify *kp = (void *) skb->data;
2816
2817 BT_DBG("value 0x%02x", kp->value);
2818
2819 return 0;
2820}
2821
4befb867 2822static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
eb492e01 2823{
5d88cc73 2824 struct l2cap_conn *conn = chan->conn;
7b9899db 2825 struct hci_conn *hcon = conn->hcon;
b28b4943 2826 struct smp_chan *smp;
92381f5c 2827 __u8 code, reason;
eb492e01
AB		 2828 int err = 0;
2829
8ae9b984 2830 if (skb->len < 1)
92381f5c 2831 return -EILSEQ;
92381f5c 2832
d7a5a11d 2833 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) {
2e65c9d2
AG		 2834 reason = SMP_PAIRING_NOTSUPP;
2835 goto done;
2836 }
2837
92381f5c 2838 code = skb->data[0];
eb492e01
AB		 2839 skb_pull(skb, sizeof(code));
2840
b28b4943
JH		 2841 smp = chan->data;
2842
2843 if (code > SMP_CMD_MAX)
2844 goto drop;
2845
24bd0bd9 2846 if (smp && !test_and_clear_bit(code, &smp->allow_cmd))
b28b4943
JH		 2847 goto drop;
2848
2849 /* If we don't have a context the only allowed commands are
2850 * pairing request and security request.
8cf9fa12 2851 */
b28b4943
JH		 2852 if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ)
2853 goto drop;
8cf9fa12 2854
eb492e01
AB		 2855 switch (code) {
2856 case SMP_CMD_PAIRING_REQ:
da85e5e5 2857 reason = smp_cmd_pairing_req(conn, skb);
eb492e01
AB		 2858 break;
2859
2860 case SMP_CMD_PAIRING_FAIL:
84794e11 2861 smp_failure(conn, 0);
da85e5e5 2862 err = -EPERM;
eb492e01
AB		 2863 break;
2864
2865 case SMP_CMD_PAIRING_RSP:
da85e5e5 2866 reason = smp_cmd_pairing_rsp(conn, skb);
88ba43b6
AB		 2867 break;
2868
2869 case SMP_CMD_SECURITY_REQ:
da85e5e5 2870 reason = smp_cmd_security_req(conn, skb);
88ba43b6
AB		 2871 break;
2872
eb492e01 2873 case SMP_CMD_PAIRING_CONFIRM:
da85e5e5 2874 reason = smp_cmd_pairing_confirm(conn, skb);
88ba43b6
AB		 2875 break;
2876
eb492e01 2877 case SMP_CMD_PAIRING_RANDOM:
da85e5e5 2878 reason = smp_cmd_pairing_random(conn, skb);
88ba43b6
AB		 2879 break;
2880
eb492e01 2881 case SMP_CMD_ENCRYPT_INFO:
7034b911
VCG		 2882 reason = smp_cmd_encrypt_info(conn, skb);
2883 break;
2884
eb492e01 2885 case SMP_CMD_MASTER_IDENT:
7034b911
VCG		 2886 reason = smp_cmd_master_ident(conn, skb);
2887 break;
2888
eb492e01 2889 case SMP_CMD_IDENT_INFO:
fd349c02
JH		 2890 reason = smp_cmd_ident_info(conn, skb);
2891 break;
2892
eb492e01 2893 case SMP_CMD_IDENT_ADDR_INFO:
fd349c02
JH		 2894 reason = smp_cmd_ident_addr_info(conn, skb);
2895 break;
2896
eb492e01 2897 case SMP_CMD_SIGN_INFO:
7ee4ea36 2898 reason = smp_cmd_sign_info(conn, skb);
7034b911
VCG		 2899 break;
2900
d8f8edbe
JH		 2901 case SMP_CMD_PUBLIC_KEY:
2902 reason = smp_cmd_public_key(conn, skb);
2903 break;
2904
6433a9a2
JH		 2905 case SMP_CMD_DHKEY_CHECK:
2906 reason = smp_cmd_dhkey_check(conn, skb);
2907 break;
2908
1408bb6e
JH		 2909 case SMP_CMD_KEYPRESS_NOTIFY:
2910 reason = smp_cmd_keypress_notify(conn, skb);
2911 break;
2912
eb492e01
AB		 2913 default:
2914 BT_DBG("Unknown command code 0x%2.2x", code);
eb492e01 2915 reason = SMP_CMD_NOTSUPP;
3a0259bb 2916 goto done;
eb492e01
AB		 2917 }
2918
3a0259bb 2919done:
9b7b18ef
JH		 2920 if (!err) {
2921 if (reason)
2922 smp_failure(conn, reason);
8ae9b984 2923 kfree_skb(skb);
9b7b18ef
JH		 2924 }
2925
eb492e01 2926 return err;
b28b4943
JH		 2927
2928drop:
2929 BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name,
2930 code, &hcon->dst);
2931 kfree_skb(skb);
2932 return 0;
eb492e01 2933}
7034b911 2934
70db83c4
JH		 2935static void smp_teardown_cb(struct l2cap_chan *chan, int err)
2936{
2937 struct l2cap_conn *conn = chan->conn;
2938
2939 BT_DBG("chan %p", chan);
2940
fc75cc86 2941 if (chan->data)
5d88cc73 2942 smp_chan_destroy(conn);
5d88cc73 2943
70db83c4
JH		 2944 conn->smp = NULL;
2945 l2cap_chan_put(chan);
2946}
2947
b5ae344d
JH		 2948static void bredr_pairing(struct l2cap_chan *chan)
2949{
2950 struct l2cap_conn *conn = chan->conn;
2951 struct hci_conn *hcon = conn->hcon;
2952 struct hci_dev *hdev = hcon->hdev;
2953 struct smp_cmd_pairing req;
2954 struct smp_chan *smp;
2955
2956 BT_DBG("chan %p", chan);
2957
2958 /* Only new pairings are interesting */
2959 if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags))
2960 return;
2961
2962 /* Don't bother if we're not encrypted */
2963 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
2964 return;
2965
2966 /* Only master may initiate SMP over BR/EDR */
2967 if (hcon->role != HCI_ROLE_MASTER)
2968 return;
2969
2970 /* Secure Connections support must be enabled */
d7a5a11d 2971 if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED))
b5ae344d
JH		 2972 return;
2973
2974 /* BR/EDR must use Secure Connections for SMP */
2975 if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) &&
b7cb93e5 2976 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
b5ae344d
JH		 2977 return;
2978
2979 /* If our LE support is not enabled don't do anything */
d7a5a11d 2980 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
b5ae344d
JH		 2981 return;
2982
2983 /* Don't bother if remote LE support is not enabled */
2984 if (!lmp_host_le_capable(hcon))
2985 return;
2986
2987 /* Remote must support SMP fixed chan for BR/EDR */
2988 if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR))
2989 return;
2990
2991 /* Don't bother if SMP is already ongoing */
2992 if (chan->data)
2993 return;
2994
2995 smp = smp_chan_create(conn);
2996 if (!smp) {
2997 BT_ERR("%s unable to create SMP context for BR/EDR",
2998 hdev->name);
2999 return;
3000 }
3001
3002 set_bit(SMP_FLAG_SC, &smp->flags);
3003
3004 BT_DBG("%s starting SMP over BR/EDR", hdev->name);
3005
3006 /* Prepare and send the BR/EDR SMP Pairing Request */
3007 build_bredr_pairing_cmd(smp, &req, NULL);
3008
3009 smp->preq[0] = SMP_CMD_PAIRING_REQ;
3010 memcpy(&smp->preq[1], &req, sizeof(req));
3011
3012 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req);
3013 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
3014}
3015
44f1a7ab
JH		 3016static void smp_resume_cb(struct l2cap_chan *chan)
3017{
b68fda68 3018 struct smp_chan *smp = chan->data;
44f1a7ab
JH		 3019 struct l2cap_conn *conn = chan->conn;
3020 struct hci_conn *hcon = conn->hcon;
3021
3022 BT_DBG("chan %p", chan);
3023
b5ae344d
JH		 3024 if (hcon->type == ACL_LINK) {
3025 bredr_pairing(chan);
ef8efe4b 3026 return;
b5ae344d 3027 }
ef8efe4b 3028
86d1407c
JH		 3029 if (!smp)
3030 return;
b68fda68 3031
84bc0db5
JH		 3032 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3033 return;
3034
86d1407c
JH		 3035 cancel_delayed_work(&smp->security_timer);
3036
d6268e86 3037 smp_distribute_keys(smp);
44f1a7ab
JH		 3038}
3039
70db83c4
JH		 3040static void smp_ready_cb(struct l2cap_chan *chan)
3041{
3042 struct l2cap_conn *conn = chan->conn;
b5ae344d 3043 struct hci_conn *hcon = conn->hcon;
70db83c4
JH		 3044
3045 BT_DBG("chan %p", chan);
3046
7883746b
JH		 3047 /* No need to call l2cap_chan_hold() here since we already own
3048 * the reference taken in smp_new_conn_cb(). This is just the
3049 * first time that we tie it to a specific pointer. The code in
3050 * l2cap_core.c ensures that there's no risk this function wont
3051 * get called if smp_new_conn_cb was previously called.
3052 */
70db83c4 3053 conn->smp = chan;
b5ae344d
JH		 3054
3055 if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3056 bredr_pairing(chan);
70db83c4
JH		 3057}
3058
4befb867
JH		 3059static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
3060{
3061 int err;
3062
3063 BT_DBG("chan %p", chan);
3064
3065 err = smp_sig_channel(chan, skb);
3066 if (err) {
b68fda68 3067 struct smp_chan *smp = chan->data;
4befb867 3068
b68fda68
JH		 3069 if (smp)
3070 cancel_delayed_work_sync(&smp->security_timer);
4befb867 3071
1e91c29e 3072 hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);
4befb867
JH		 3073 }
3074
3075 return err;
3076}
3077
70db83c4
JH		 3078static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan,
3079 unsigned long hdr_len,
3080 unsigned long len, int nb)
3081{
3082 struct sk_buff *skb;
3083
3084 skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
3085 if (!skb)
3086 return ERR_PTR(-ENOMEM);
3087
3088 skb->priority = HCI_PRIO_MAX;
a4368ff3 3089 bt_cb(skb)->l2cap.chan = chan;
70db83c4
JH		 3090
3091 return skb;
3092}
3093
3094static const struct l2cap_ops smp_chan_ops = {
3095 .name = "Security Manager",
3096 .ready = smp_ready_cb,
5d88cc73 3097 .recv = smp_recv_cb,
70db83c4
JH		 3098 .alloc_skb = smp_alloc_skb_cb,
3099 .teardown = smp_teardown_cb,
44f1a7ab 3100 .resume = smp_resume_cb,
70db83c4
JH		 3101
3102 .new_connection = l2cap_chan_no_new_connection,
70db83c4
JH		 3103 .state_change = l2cap_chan_no_state_change,
3104 .close = l2cap_chan_no_close,
3105 .defer = l2cap_chan_no_defer,
3106 .suspend = l2cap_chan_no_suspend,
70db83c4
JH		 3107 .set_shutdown = l2cap_chan_no_set_shutdown,
3108 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3109};
3110
3111static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan)
3112{
3113 struct l2cap_chan *chan;
3114
3115 BT_DBG("pchan %p", pchan);
3116
3117 chan = l2cap_chan_create();
3118 if (!chan)
3119 return NULL;
3120
3121 chan->chan_type = pchan->chan_type;
3122 chan->ops = &smp_chan_ops;
3123 chan->scid = pchan->scid;
3124 chan->dcid = chan->scid;
3125 chan->imtu = pchan->imtu;
3126 chan->omtu = pchan->omtu;
3127 chan->mode = pchan->mode;
3128
abe84903
JH		 3129 /* Other L2CAP channels may request SMP routines in order to
3130 * change the security level. This means that the SMP channel
3131 * lock must be considered in its own category to avoid lockdep
3132 * warnings.
3133 */
3134 atomic_set(&chan->nesting, L2CAP_NESTING_SMP);
3135
70db83c4
JH		 3136 BT_DBG("created chan %p", chan);
3137
3138 return chan;
3139}
3140
3141static const struct l2cap_ops smp_root_chan_ops = {
3142 .name = "Security Manager Root",
3143 .new_connection = smp_new_conn_cb,
3144
3145 /* None of these are implemented for the root channel */
3146 .close = l2cap_chan_no_close,
3147 .alloc_skb = l2cap_chan_no_alloc_skb,
3148 .recv = l2cap_chan_no_recv,
3149 .state_change = l2cap_chan_no_state_change,
3150 .teardown = l2cap_chan_no_teardown,
3151 .ready = l2cap_chan_no_ready,
3152 .defer = l2cap_chan_no_defer,
3153 .suspend = l2cap_chan_no_suspend,
3154 .resume = l2cap_chan_no_resume,
3155 .set_shutdown = l2cap_chan_no_set_shutdown,
3156 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
70db83c4
JH		 3157};
3158
ef8efe4b 3159static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
711eafe3 3160{
70db83c4 3161 struct l2cap_chan *chan;
88a479d9 3162 struct smp_dev *smp;
a4770e11 3163 struct crypto_cipher *tfm_aes;
71af2f6b 3164 struct crypto_shash *tfm_cmac;
70db83c4 3165
ef8efe4b 3166 if (cid == L2CAP_CID_SMP_BREDR) {
88a479d9 3167 smp = NULL;
ef8efe4b
JH		 3168 goto create_chan;
3169 }
711eafe3 3170
88a479d9
MH		 3171 smp = kzalloc(sizeof(*smp), GFP_KERNEL);
3172 if (!smp)
3173 return ERR_PTR(-ENOMEM);
3174
a4770e11 3175 tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
defce9e8 3176 if (IS_ERR(tfm_aes)) {
a4770e11 3177 BT_ERR("Unable to create AES crypto context");
88a479d9 3178 kzfree(smp);
fe700771 3179 return ERR_CAST(tfm_aes);
711eafe3
JH		 3180 }
3181
71af2f6b 3182 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
6e2dc6d1
MH		 3183 if (IS_ERR(tfm_cmac)) {
3184 BT_ERR("Unable to create CMAC crypto context");
a4770e11 3185 crypto_free_cipher(tfm_aes);
6e2dc6d1
MH		 3186 kzfree(smp);
3187 return ERR_CAST(tfm_cmac);
3188 }
3189
88a479d9 3190 smp->tfm_aes = tfm_aes;
6e2dc6d1 3191 smp->tfm_cmac = tfm_cmac;
b1f663c9 3192 smp->min_key_size = SMP_MIN_ENC_KEY_SIZE;
2fd36558 3193 smp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
88a479d9 3194
ef8efe4b 3195create_chan:
70db83c4
JH		 3196 chan = l2cap_chan_create();
3197 if (!chan) {
63511f6d 3198 if (smp) {
a4770e11 3199 crypto_free_cipher(smp->tfm_aes);
71af2f6b 3200 crypto_free_shash(smp->tfm_cmac);
63511f6d
MH		 3201 kzfree(smp);
3202 }
ef8efe4b 3203 return ERR_PTR(-ENOMEM);
70db83c4
JH		 3204 }
3205
88a479d9 3206 chan->data = smp;
defce9e8 3207
ef8efe4b 3208 l2cap_add_scid(chan, cid);
70db83c4
JH		 3209
3210 l2cap_chan_set_defaults(chan);
3211
157029ba 3212 if (cid == L2CAP_CID_SMP) {
39e3e744
JH		 3213 u8 bdaddr_type;
3214
3215 hci_copy_identity_address(hdev, &chan->src, &bdaddr_type);
3216
3217 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
157029ba 3218 chan->src_type = BDADDR_LE_PUBLIC;
39e3e744
JH		 3219 else
3220 chan->src_type = BDADDR_LE_RANDOM;
157029ba
MH		 3221 } else {
3222 bacpy(&chan->src, &hdev->bdaddr);
ef8efe4b 3223 chan->src_type = BDADDR_BREDR;
157029ba
MH		 3224 }
3225
70db83c4
JH		 3226 chan->state = BT_LISTEN;
3227 chan->mode = L2CAP_MODE_BASIC;
3228 chan->imtu = L2CAP_DEFAULT_MTU;
3229 chan->ops = &smp_root_chan_ops;
3230
abe84903
JH		 3231 /* Set correct nesting level for a parent/listening channel */
3232 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
3233
ef8efe4b 3234 return chan;
711eafe3
JH		 3235}
3236
ef8efe4b 3237static void smp_del_chan(struct l2cap_chan *chan)
711eafe3 3238{
88a479d9 3239 struct smp_dev *smp;
70db83c4 3240
ef8efe4b 3241 BT_DBG("chan %p", chan);
711eafe3 3242
88a479d9
MH		 3243 smp = chan->data;
3244 if (smp) {
defce9e8 3245 chan->data = NULL;
a4770e11 3246 crypto_free_cipher(smp->tfm_aes);
71af2f6b 3247 crypto_free_shash(smp->tfm_cmac);
88a479d9 3248 kzfree(smp);
711eafe3 3249 }
70db83c4 3250
70db83c4 3251 l2cap_chan_put(chan);
711eafe3 3252}
ef8efe4b 3253
300acfde
MH		 3254static ssize_t force_bredr_smp_read(struct file *file,
3255 char __user *user_buf,
3256 size_t count, loff_t *ppos)
3257{
3258 struct hci_dev *hdev = file->private_data;
3259 char buf[3];
3260
b7cb93e5 3261 buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N';
300acfde
MH		 3262 buf[1] = '\n';
3263 buf[2] = '\0';
3264 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
3265}
3266
3267static ssize_t force_bredr_smp_write(struct file *file,
3268 const char __user *user_buf,
3269 size_t count, loff_t *ppos)
3270{
3271 struct hci_dev *hdev = file->private_data;
3272 char buf[32];
3273 size_t buf_size = min(count, (sizeof(buf)-1));
3274 bool enable;
3275
3276 if (copy_from_user(buf, user_buf, buf_size))
3277 return -EFAULT;
3278
3279 buf[buf_size] = '\0';
3280 if (strtobool(buf, &enable))
3281 return -EINVAL;
3282
b7cb93e5 3283 if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
300acfde
MH		 3284 return -EALREADY;
3285
3286 if (enable) {
3287 struct l2cap_chan *chan;
3288
3289 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3290 if (IS_ERR(chan))
3291 return PTR_ERR(chan);
3292
3293 hdev->smp_bredr_data = chan;
3294 } else {
3295 struct l2cap_chan *chan;
3296
3297 chan = hdev->smp_bredr_data;
3298 hdev->smp_bredr_data = NULL;
3299 smp_del_chan(chan);
3300 }
3301
b7cb93e5 3302 hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
300acfde
MH		 3303
3304 return count;
3305}
3306
3307static const struct file_operations force_bredr_smp_fops = {
3308 .open = simple_open,
3309 .read = force_bredr_smp_read,
3310 .write = force_bredr_smp_write,
3311 .llseek = default_llseek,
3312};
3313
b1f663c9
JH		 3314static ssize_t le_min_key_size_read(struct file *file,
3315 char __user *user_buf,
3316 size_t count, loff_t *ppos)
3317{
3318 struct hci_dev *hdev = file->private_data;
3319 char buf[4];
3320
3321 snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size);
3322
3323 return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
3324}
3325
3326static ssize_t le_min_key_size_write(struct file *file,
3327 const char __user *user_buf,
3328 size_t count, loff_t *ppos)
3329{
3330 struct hci_dev *hdev = file->private_data;
3331 char buf[32];
3332 size_t buf_size = min(count, (sizeof(buf) - 1));
3333 u8 key_size;
3334
3335 if (copy_from_user(buf, user_buf, buf_size))
3336 return -EFAULT;
3337
3338 buf[buf_size] = '\0';
3339
3340 sscanf(buf, "%hhu", &key_size);
3341
3342 if (key_size > SMP_DEV(hdev)->max_key_size ||
3343 key_size < SMP_MIN_ENC_KEY_SIZE)
3344 return -EINVAL;
3345
3346 SMP_DEV(hdev)->min_key_size = key_size;
3347
3348 return count;
3349}
3350
3351static const struct file_operations le_min_key_size_fops = {
3352 .open = simple_open,
3353 .read = le_min_key_size_read,
3354 .write = le_min_key_size_write,
3355 .llseek = default_llseek,
3356};
3357
2fd36558
JH		 3358static ssize_t le_max_key_size_read(struct file *file,
3359 char __user *user_buf,
3360 size_t count, loff_t *ppos)
3361{
3362 struct hci_dev *hdev = file->private_data;
3363 char buf[4];
3364
3365 snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->max_key_size);
3366
3367 return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
3368}
3369
3370static ssize_t le_max_key_size_write(struct file *file,
3371 const char __user *user_buf,
3372 size_t count, loff_t *ppos)
3373{
3374 struct hci_dev *hdev = file->private_data;
3375 char buf[32];
3376 size_t buf_size = min(count, (sizeof(buf) - 1));
3377 u8 key_size;
3378
3379 if (copy_from_user(buf, user_buf, buf_size))
3380 return -EFAULT;
3381
3382 buf[buf_size] = '\0';
3383
3384 sscanf(buf, "%hhu", &key_size);
3385
b1f663c9
JH		 3386 if (key_size > SMP_MAX_ENC_KEY_SIZE ||
3387 key_size < SMP_DEV(hdev)->min_key_size)
2fd36558
JH		 3388 return -EINVAL;
3389
3390 SMP_DEV(hdev)->max_key_size = key_size;
3391
3392 return count;
3393}
3394
3395static const struct file_operations le_max_key_size_fops = {
3396 .open = simple_open,
3397 .read = le_max_key_size_read,
3398 .write = le_max_key_size_write,
3399 .llseek = default_llseek,
3400};
3401
ef8efe4b
JH		 3402int smp_register(struct hci_dev *hdev)
3403{
3404 struct l2cap_chan *chan;
3405
3406 BT_DBG("%s", hdev->name);
3407
7e7ec445
MH		 3408 /* If the controller does not support Low Energy operation, then
3409 * there is also no need to register any SMP channel.
3410 */
3411 if (!lmp_le_capable(hdev))
3412 return 0;
3413
2b8df323
MH		 3414 if (WARN_ON(hdev->smp_data)) {
3415 chan = hdev->smp_data;
3416 hdev->smp_data = NULL;
3417 smp_del_chan(chan);
3418 }
3419
ef8efe4b
JH		 3420 chan = smp_add_cid(hdev, L2CAP_CID_SMP);
3421 if (IS_ERR(chan))
3422 return PTR_ERR(chan);
3423
3424 hdev->smp_data = chan;
3425
b1f663c9
JH		 3426 debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev,
3427 &le_min_key_size_fops);
2fd36558
JH		 3428 debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev,
3429 &le_max_key_size_fops);
3430
300acfde
MH		 3431 /* If the controller does not support BR/EDR Secure Connections
3432 * feature, then the BR/EDR SMP channel shall not be present.
3433 *
3434 * To test this with Bluetooth 4.0 controllers, create a debugfs
3435 * switch that allows forcing BR/EDR SMP support and accepting
3436 * cross-transport pairing on non-AES encrypted connections.
3437 */
3438 if (!lmp_sc_capable(hdev)) {
3439 debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs,
3440 hdev, &force_bredr_smp_fops);
83ebb9ec
SJ		 3441
3442 /* Flag can be already set here (due to power toggle) */
3443 if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
3444 return 0;
300acfde 3445 }
ef8efe4b 3446
2b8df323
MH		 3447 if (WARN_ON(hdev->smp_bredr_data)) {
3448 chan = hdev->smp_bredr_data;
3449 hdev->smp_bredr_data = NULL;
3450 smp_del_chan(chan);
3451 }
3452
ef8efe4b
JH		 3453 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3454 if (IS_ERR(chan)) {
3455 int err = PTR_ERR(chan);
3456 chan = hdev->smp_data;
3457 hdev->smp_data = NULL;
3458 smp_del_chan(chan);
3459 return err;
3460 }
3461
3462 hdev->smp_bredr_data = chan;
3463
3464 return 0;
3465}
3466
3467void smp_unregister(struct hci_dev *hdev)
3468{
3469 struct l2cap_chan *chan;
3470
3471 if (hdev->smp_bredr_data) {
3472 chan = hdev->smp_bredr_data;
3473 hdev->smp_bredr_data = NULL;
3474 smp_del_chan(chan);
3475 }
3476
3477 if (hdev->smp_data) {
3478 chan = hdev->smp_data;
3479 hdev->smp_data = NULL;
3480 smp_del_chan(chan);
3481 }
3482}
0a2b0f04
JH		 3483
3484#if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
3485
a4770e11 3486static int __init test_ah(struct crypto_cipher *tfm_aes)
cfc4198e
JH		 3487{
3488 const u8 irk[16] = {
3489 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3490 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3491 const u8 r[3] = { 0x94, 0x81, 0x70 };
3492 const u8 exp[3] = { 0xaa, 0xfb, 0x0d };
3493 u8 res[3];
3494 int err;
3495
3496 err = smp_ah(tfm_aes, irk, r, res);
3497 if (err)
3498 return err;
3499
3500 if (memcmp(res, exp, 3))
3501 return -EINVAL;
3502
3503 return 0;
3504}
3505
a4770e11 3506static int __init test_c1(struct crypto_cipher *tfm_aes)
cfc4198e
JH		 3507{
3508 const u8 k[16] = {
3509 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3510 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3511 const u8 r[16] = {
3512 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63,
3513 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 };
3514 const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 };
3515 const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 };
3516 const u8 _iat = 0x01;
3517 const u8 _rat = 0x00;
3518 const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } };
3519 const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } };
3520 const u8 exp[16] = {
3521 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2,
3522 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e };
3523 u8 res[16];
3524 int err;
3525
3526 err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res);
3527 if (err)
3528 return err;
3529
3530 if (memcmp(res, exp, 16))
3531 return -EINVAL;
3532
3533 return 0;
3534}
3535
a4770e11 3536static int __init test_s1(struct crypto_cipher *tfm_aes)
cfc4198e
JH		 3537{
3538 const u8 k[16] = {
3539 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3540 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3541 const u8 r1[16] = {
3542 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 };
3543 const u8 r2[16] = {
3544 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 };
3545 const u8 exp[16] = {
3546 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b,
3547 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a };
3548 u8 res[16];
3549 int err;
3550
3551 err = smp_s1(tfm_aes, k, r1, r2, res);
3552 if (err)
3553 return err;
3554
3555 if (memcmp(res, exp, 16))
3556 return -EINVAL;
3557
3558 return 0;
3559}
3560
71af2f6b 3561static int __init test_f4(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3562{
3563 const u8 u[32] = {
3564 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3565 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3566 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3567 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3568 const u8 v[32] = {
3569 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3570 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3571 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3572 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3573 const u8 x[16] = {
3574 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3575 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3576 const u8 z = 0x00;
3577 const u8 exp[16] = {
3578 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1,
3579 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 };
3580 u8 res[16];
3581 int err;
3582
3583 err = smp_f4(tfm_cmac, u, v, x, z, res);
3584 if (err)
3585 return err;
3586
3587 if (memcmp(res, exp, 16))
3588 return -EINVAL;
3589
3590 return 0;
3591}
3592
71af2f6b 3593static int __init test_f5(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3594{
3595 const u8 w[32] = {
3596 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86,
3597 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99,
3598 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3599 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3600 const u8 n1[16] = {
3601 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3602 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3603 const u8 n2[16] = {
3604 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3605 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3606 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3607 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3608 const u8 exp_ltk[16] = {
3609 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98,
3610 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 };
3611 const u8 exp_mackey[16] = {
3612 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3613 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3614 u8 mackey[16], ltk[16];
3615 int err;
3616
3617 err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk);
3618 if (err)
3619 return err;
3620
3621 if (memcmp(mackey, exp_mackey, 16))
3622 return -EINVAL;
3623
3624 if (memcmp(ltk, exp_ltk, 16))
3625 return -EINVAL;
3626
3627 return 0;
3628}
3629
71af2f6b 3630static int __init test_f6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3631{
3632 const u8 w[16] = {
3633 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3634 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3635 const u8 n1[16] = {
3636 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3637 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3638 const u8 n2[16] = {
3639 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3640 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3641 const u8 r[16] = {
3642 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08,
3643 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 };
3644 const u8 io_cap[3] = { 0x02, 0x01, 0x01 };
3645 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3646 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3647 const u8 exp[16] = {
3648 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2,
3649 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 };
3650 u8 res[16];
3651 int err;
3652
3653 err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res);
3654 if (err)
3655 return err;
3656
3657 if (memcmp(res, exp, 16))
3658 return -EINVAL;
3659
3660 return 0;
3661}
3662
71af2f6b 3663static int __init test_g2(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3664{
3665 const u8 u[32] = {
3666 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3667 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3668 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3669 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3670 const u8 v[32] = {
3671 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3672 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3673 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3674 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3675 const u8 x[16] = {
3676 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3677 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3678 const u8 y[16] = {
3679 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3680 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3681 const u32 exp_val = 0x2f9ed5ba % 1000000;
3682 u32 val;
3683 int err;
3684
3685 err = smp_g2(tfm_cmac, u, v, x, y, &val);
3686 if (err)
3687 return err;
3688
3689 if (val != exp_val)
3690 return -EINVAL;
3691
3692 return 0;
3693}
3694
71af2f6b 3695static int __init test_h6(struct crypto_shash *tfm_cmac)
fb2969a3
JH		 3696{
3697 const u8 w[16] = {
3698 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3699 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3700 const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c };
3701 const u8 exp[16] = {
3702 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8,
3703 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d };
3704 u8 res[16];
3705 int err;
3706
3707 err = smp_h6(tfm_cmac, w, key_id, res);
3708 if (err)
3709 return err;
3710
3711 if (memcmp(res, exp, 16))
3712 return -EINVAL;
3713
3714 return 0;
3715}
3716
64dd374e
MH		 3717static char test_smp_buffer[32];
3718
3719static ssize_t test_smp_read(struct file *file, char __user *user_buf,
3720 size_t count, loff_t *ppos)
3721{
3722 return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer,
3723 strlen(test_smp_buffer));
3724}
3725
3726static const struct file_operations test_smp_fops = {
3727 .open = simple_open,
3728 .read = test_smp_read,
3729 .llseek = default_llseek,
3730};
3731
a4770e11 3732static int __init run_selftests(struct crypto_cipher *tfm_aes,
71af2f6b 3733 struct crypto_shash *tfm_cmac)
0a2b0f04 3734{
255047b0
MH		 3735 ktime_t calltime, delta, rettime;
3736 unsigned long long duration;
cfc4198e
JH		 3737 int err;
3738
255047b0
MH		 3739 calltime = ktime_get();
3740
cfc4198e
JH		 3741 err = test_ah(tfm_aes);
3742 if (err) {
3743 BT_ERR("smp_ah test failed");
64dd374e 3744 goto done;
cfc4198e
JH		 3745 }
3746
3747 err = test_c1(tfm_aes);
3748 if (err) {
3749 BT_ERR("smp_c1 test failed");
64dd374e 3750 goto done;
cfc4198e
JH		 3751 }
3752
3753 err = test_s1(tfm_aes);
3754 if (err) {
3755 BT_ERR("smp_s1 test failed");
64dd374e 3756 goto done;
cfc4198e
JH		 3757 }
3758
fb2969a3
JH		 3759 err = test_f4(tfm_cmac);
3760 if (err) {
3761 BT_ERR("smp_f4 test failed");
64dd374e 3762 goto done;
fb2969a3
JH		 3763 }
3764
3765 err = test_f5(tfm_cmac);
3766 if (err) {
3767 BT_ERR("smp_f5 test failed");
64dd374e 3768 goto done;
fb2969a3
JH		 3769 }
3770
3771 err = test_f6(tfm_cmac);
3772 if (err) {
3773 BT_ERR("smp_f6 test failed");
64dd374e 3774 goto done;
fb2969a3
JH		 3775 }
3776
3777 err = test_g2(tfm_cmac);
3778 if (err) {
3779 BT_ERR("smp_g2 test failed");
64dd374e 3780 goto done;
fb2969a3
JH		 3781 }
3782
3783 err = test_h6(tfm_cmac);
3784 if (err) {
3785 BT_ERR("smp_h6 test failed");
64dd374e 3786 goto done;
fb2969a3
JH		 3787 }
3788
255047b0
MH		 3789 rettime = ktime_get();
3790 delta = ktime_sub(rettime, calltime);
3791 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
3792
5ced2464 3793 BT_INFO("SMP test passed in %llu usecs", duration);
0a2b0f04 3794
64dd374e
MH		 3795done:
3796 if (!err)
3797 snprintf(test_smp_buffer, sizeof(test_smp_buffer),
3798 "PASS (%llu usecs)\n", duration);
3799 else
3800 snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n");
3801
3802 debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL,
3803 &test_smp_fops);
3804
3805 return err;
0a2b0f04
JH		 3806}
3807
3808int __init bt_selftest_smp(void)
3809{
a4770e11 3810 struct crypto_cipher *tfm_aes;
71af2f6b 3811 struct crypto_shash *tfm_cmac;
0a2b0f04
JH		 3812 int err;
3813
a4770e11 3814 tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
0a2b0f04 3815 if (IS_ERR(tfm_aes)) {
a4770e11 3816 BT_ERR("Unable to create AES crypto context");
0a2b0f04
JH		 3817 return PTR_ERR(tfm_aes);
3818 }
3819
71af2f6b 3820 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, CRYPTO_ALG_ASYNC);
0a2b0f04
JH		 3821 if (IS_ERR(tfm_cmac)) {
3822 BT_ERR("Unable to create CMAC crypto context");
a4770e11 3823 crypto_free_cipher(tfm_aes);
0a2b0f04
JH		 3824 return PTR_ERR(tfm_cmac);
3825 }
3826
3827 err = run_selftests(tfm_aes, tfm_cmac);
3828
71af2f6b 3829 crypto_free_shash(tfm_cmac);
a4770e11 3830 crypto_free_cipher(tfm_aes);
0a2b0f04
JH		 3831
3832 return err;
3833}
3834
3835#endif
Ubuntu Artful kernel mirror