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