Commit | Line | Data |
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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
300acfde | 23 | #include <linux/debugfs.h> |
8c520a59 | 24 | #include <linux/scatterlist.h> |
a4770e11 | 25 | #include <linux/crypto.h> |
28a220aa | 26 | #include <crypto/aes.h> |
329d8230 | 27 | #include <crypto/algapi.h> |
71af2f6b | 28 | #include <crypto/hash.h> |
47eb2ac8 | 29 | #include <crypto/kpp.h> |
8c520a59 | 30 | |
eb492e01 AB |
31 | #include <net/bluetooth/bluetooth.h> |
32 | #include <net/bluetooth/hci_core.h> | |
33 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 34 | #include <net/bluetooth/mgmt.h> |
ac4b7236 | 35 | |
58771c1c | 36 | #include "ecdh_helper.h" |
ac4b7236 | 37 | #include "smp.h" |
d22ef0bc | 38 | |
2fd36558 JH |
39 | #define SMP_DEV(hdev) \ |
40 | ((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data) | |
41 | ||
c7a3d57d | 42 | /* Low-level debug macros to be used for stuff that we don't want |
91641b79 | 43 | * accidentally in dmesg, i.e. the values of the various crypto keys |
c7a3d57d JH |
44 | * and the inputs & outputs of crypto functions. |
45 | */ | |
46 | #ifdef DEBUG | |
47 | #define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
48 | ##__VA_ARGS__) | |
49 | #else | |
50 | #define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
51 | ##__VA_ARGS__) | |
52 | #endif | |
53 | ||
b28b4943 | 54 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 55 | |
3b19146d | 56 | /* Keys which are not distributed with Secure Connections */ |
c29fb5f6 | 57 | #define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY) |
3b19146d | 58 | |
17b02e62 | 59 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 60 | |
d7a5a11d | 61 | #define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \ |
a62da6f1 | 62 | 0x3f : 0x07) |
0edb14de | 63 | #define KEY_DIST_MASK 0x07 |
065a13e2 | 64 | |
cbbbe3e2 JH |
65 | /* Maximum message length that can be passed to aes_cmac */ |
66 | #define CMAC_MSG_MAX 80 | |
67 | ||
533e35d4 JH |
68 | enum { |
69 | SMP_FLAG_TK_VALID, | |
70 | SMP_FLAG_CFM_PENDING, | |
71 | SMP_FLAG_MITM_AUTH, | |
72 | SMP_FLAG_COMPLETE, | |
73 | SMP_FLAG_INITIATOR, | |
65668776 | 74 | SMP_FLAG_SC, |
d8f8edbe | 75 | SMP_FLAG_REMOTE_PK, |
aeb7d461 | 76 | SMP_FLAG_DEBUG_KEY, |
38606f14 | 77 | SMP_FLAG_WAIT_USER, |
d3e54a87 | 78 | SMP_FLAG_DHKEY_PENDING, |
1a8bab4f JH |
79 | SMP_FLAG_REMOTE_OOB, |
80 | SMP_FLAG_LOCAL_OOB, | |
a62da6f1 | 81 | SMP_FLAG_CT2, |
533e35d4 | 82 | }; |
4bc58f51 | 83 | |
88a479d9 | 84 | struct smp_dev { |
60a27d65 | 85 | /* Secure Connections OOB data */ |
94f14e47 | 86 | bool local_oob; |
60a27d65 | 87 | u8 local_pk[64]; |
fb334fee | 88 | u8 local_rand[16]; |
60a27d65 MH |
89 | bool debug_key; |
90 | ||
71af2f6b | 91 | struct crypto_shash *tfm_cmac; |
47eb2ac8 | 92 | struct crypto_kpp *tfm_ecdh; |
88a479d9 MH |
93 | }; |
94 | ||
4bc58f51 | 95 | struct smp_chan { |
b68fda68 JH |
96 | struct l2cap_conn *conn; |
97 | struct delayed_work security_timer; | |
b28b4943 | 98 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 99 | |
4bc58f51 JH |
100 | u8 preq[7]; /* SMP Pairing Request */ |
101 | u8 prsp[7]; /* SMP Pairing Response */ | |
102 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
103 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
104 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
105 | u8 tk[16]; /* SMP Temporary Key */ | |
882fafad JH |
106 | u8 rr[16]; /* Remote OOB ra/rb value */ |
107 | u8 lr[16]; /* Local OOB ra/rb value */ | |
4bc58f51 JH |
108 | u8 enc_key_size; |
109 | u8 remote_key_dist; | |
110 | bdaddr_t id_addr; | |
111 | u8 id_addr_type; | |
112 | u8 irk[16]; | |
113 | struct smp_csrk *csrk; | |
fad646e1 | 114 | struct smp_csrk *responder_csrk; |
4bc58f51 | 115 | struct smp_ltk *ltk; |
fad646e1 | 116 | struct smp_ltk *responder_ltk; |
4bc58f51 | 117 | struct smp_irk *remote_irk; |
6a77083a | 118 | u8 *link_key; |
4a74d658 | 119 | unsigned long flags; |
783e0574 | 120 | u8 method; |
38606f14 | 121 | u8 passkey_round; |
6a7bd103 | 122 | |
3b19146d JH |
123 | /* Secure Connections variables */ |
124 | u8 local_pk[64]; | |
d8f8edbe JH |
125 | u8 remote_pk[64]; |
126 | u8 dhkey[32]; | |
760b018b | 127 | u8 mackey[16]; |
3b19146d | 128 | |
71af2f6b | 129 | struct crypto_shash *tfm_cmac; |
47eb2ac8 | 130 | struct crypto_kpp *tfm_ecdh; |
4bc58f51 JH |
131 | }; |
132 | ||
aeb7d461 JH |
133 | /* These debug key values are defined in the SMP section of the core |
134 | * specification. debug_pk is the public debug key and debug_sk the | |
135 | * private debug key. | |
136 | */ | |
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 | ||
8a2936f4 | 156 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 157 | { |
8a2936f4 | 158 | size_t i; |
d22ef0bc | 159 | |
8a2936f4 JH |
160 | for (i = 0; i < len; i++) |
161 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
162 | } |
163 | ||
06edf8de JH |
164 | /* The following functions map to the LE SC SMP crypto functions |
165 | * AES-CMAC, f4, f5, f6, g2 and h6. | |
166 | */ | |
167 | ||
71af2f6b | 168 | static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m, |
cbbbe3e2 JH |
169 | size_t len, u8 mac[16]) |
170 | { | |
171 | uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX]; | |
cbbbe3e2 JH |
172 | int err; |
173 | ||
174 | if (len > CMAC_MSG_MAX) | |
175 | return -EFBIG; | |
176 | ||
177 | if (!tfm) { | |
178 | BT_ERR("tfm %p", tfm); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
cbbbe3e2 JH |
182 | /* Swap key and message from LSB to MSB */ |
183 | swap_buf(k, tmp, 16); | |
184 | swap_buf(m, msg_msb, len); | |
185 | ||
c7a3d57d JH |
186 | SMP_DBG("msg (len %zu) %*phN", len, (int) len, m); |
187 | SMP_DBG("key %16phN", k); | |
cbbbe3e2 | 188 | |
71af2f6b | 189 | err = crypto_shash_setkey(tfm, tmp, 16); |
cbbbe3e2 JH |
190 | if (err) { |
191 | BT_ERR("cipher setkey failed: %d", err); | |
192 | return err; | |
193 | } | |
194 | ||
ec0bf6ed | 195 | err = crypto_shash_tfm_digest(tfm, msg_msb, len, mac_msb); |
cbbbe3e2 | 196 | if (err) { |
71af2f6b | 197 | BT_ERR("Hash computation error %d", err); |
cbbbe3e2 JH |
198 | return err; |
199 | } | |
200 | ||
201 | swap_buf(mac_msb, mac, 16); | |
202 | ||
c7a3d57d | 203 | SMP_DBG("mac %16phN", mac); |
cbbbe3e2 JH |
204 | |
205 | return 0; | |
206 | } | |
207 | ||
71af2f6b HX |
208 | static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32], |
209 | const u8 v[32], const u8 x[16], u8 z, u8 res[16]) | |
cbbbe3e2 JH |
210 | { |
211 | u8 m[65]; | |
212 | int err; | |
213 | ||
c7a3d57d JH |
214 | SMP_DBG("u %32phN", u); |
215 | SMP_DBG("v %32phN", v); | |
216 | SMP_DBG("x %16phN z %02x", x, z); | |
cbbbe3e2 JH |
217 | |
218 | m[0] = z; | |
219 | memcpy(m + 1, v, 32); | |
220 | memcpy(m + 33, u, 32); | |
221 | ||
222 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), res); | |
223 | if (err) | |
224 | return err; | |
225 | ||
c7a3d57d | 226 | SMP_DBG("res %16phN", res); |
cbbbe3e2 JH |
227 | |
228 | return err; | |
229 | } | |
230 | ||
71af2f6b | 231 | static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32], |
4da50de8 JH |
232 | const u8 n1[16], const u8 n2[16], const u8 a1[7], |
233 | const u8 a2[7], u8 mackey[16], u8 ltk[16]) | |
760b018b JH |
234 | { |
235 | /* The btle, salt and length "magic" values are as defined in | |
236 | * the SMP section of the Bluetooth core specification. In ASCII | |
237 | * the btle value ends up being 'btle'. The salt is just a | |
238 | * random number whereas length is the value 256 in little | |
239 | * endian format. | |
240 | */ | |
241 | const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 }; | |
242 | const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60, | |
243 | 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c }; | |
244 | const u8 length[2] = { 0x00, 0x01 }; | |
245 | u8 m[53], t[16]; | |
246 | int err; | |
247 | ||
c7a3d57d JH |
248 | SMP_DBG("w %32phN", w); |
249 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
250 | SMP_DBG("a1 %7phN a2 %7phN", a1, a2); | |
760b018b JH |
251 | |
252 | err = aes_cmac(tfm_cmac, salt, w, 32, t); | |
253 | if (err) | |
254 | return err; | |
255 | ||
c7a3d57d | 256 | SMP_DBG("t %16phN", t); |
760b018b JH |
257 | |
258 | memcpy(m, length, 2); | |
259 | memcpy(m + 2, a2, 7); | |
260 | memcpy(m + 9, a1, 7); | |
261 | memcpy(m + 16, n2, 16); | |
262 | memcpy(m + 32, n1, 16); | |
263 | memcpy(m + 48, btle, 4); | |
264 | ||
265 | m[52] = 0; /* Counter */ | |
266 | ||
267 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey); | |
268 | if (err) | |
269 | return err; | |
270 | ||
c7a3d57d | 271 | SMP_DBG("mackey %16phN", mackey); |
760b018b JH |
272 | |
273 | m[52] = 1; /* Counter */ | |
274 | ||
275 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk); | |
276 | if (err) | |
277 | return err; | |
278 | ||
c7a3d57d | 279 | SMP_DBG("ltk %16phN", ltk); |
760b018b JH |
280 | |
281 | return 0; | |
282 | } | |
283 | ||
71af2f6b | 284 | static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16], |
4da50de8 | 285 | const u8 n1[16], const u8 n2[16], const u8 r[16], |
760b018b JH |
286 | const u8 io_cap[3], const u8 a1[7], const u8 a2[7], |
287 | u8 res[16]) | |
288 | { | |
289 | u8 m[65]; | |
290 | int err; | |
291 | ||
c7a3d57d JH |
292 | SMP_DBG("w %16phN", w); |
293 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
294 | SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2); | |
760b018b JH |
295 | |
296 | memcpy(m, a2, 7); | |
297 | memcpy(m + 7, a1, 7); | |
298 | memcpy(m + 14, io_cap, 3); | |
299 | memcpy(m + 17, r, 16); | |
300 | memcpy(m + 33, n2, 16); | |
301 | memcpy(m + 49, n1, 16); | |
302 | ||
303 | err = aes_cmac(tfm_cmac, w, m, sizeof(m), res); | |
304 | if (err) | |
305 | return err; | |
306 | ||
203de21b | 307 | SMP_DBG("res %16phN", res); |
760b018b JH |
308 | |
309 | return err; | |
310 | } | |
311 | ||
71af2f6b | 312 | static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32], |
191dc7fe JH |
313 | const u8 x[16], const u8 y[16], u32 *val) |
314 | { | |
315 | u8 m[80], tmp[16]; | |
316 | int err; | |
317 | ||
c7a3d57d JH |
318 | SMP_DBG("u %32phN", u); |
319 | SMP_DBG("v %32phN", v); | |
320 | SMP_DBG("x %16phN y %16phN", x, y); | |
191dc7fe JH |
321 | |
322 | memcpy(m, y, 16); | |
323 | memcpy(m + 16, v, 32); | |
324 | memcpy(m + 48, u, 32); | |
325 | ||
326 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp); | |
327 | if (err) | |
328 | return err; | |
329 | ||
330 | *val = get_unaligned_le32(tmp); | |
331 | *val %= 1000000; | |
332 | ||
c7a3d57d | 333 | SMP_DBG("val %06u", *val); |
191dc7fe JH |
334 | |
335 | return 0; | |
336 | } | |
337 | ||
71af2f6b | 338 | static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16], |
06edf8de JH |
339 | const u8 key_id[4], u8 res[16]) |
340 | { | |
341 | int err; | |
342 | ||
343 | SMP_DBG("w %16phN key_id %4phN", w, key_id); | |
344 | ||
345 | err = aes_cmac(tfm_cmac, w, key_id, 4, res); | |
346 | if (err) | |
347 | return err; | |
348 | ||
349 | SMP_DBG("res %16phN", res); | |
350 | ||
351 | return err; | |
352 | } | |
353 | ||
a62da6f1 JH |
354 | static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16], |
355 | const u8 salt[16], u8 res[16]) | |
356 | { | |
357 | int err; | |
358 | ||
359 | SMP_DBG("w %16phN salt %16phN", w, salt); | |
360 | ||
361 | err = aes_cmac(tfm_cmac, salt, w, 16, res); | |
362 | if (err) | |
363 | return err; | |
364 | ||
365 | SMP_DBG("res %16phN", res); | |
366 | ||
367 | return err; | |
368 | } | |
369 | ||
06edf8de JH |
370 | /* The following functions map to the legacy SMP crypto functions e, c1, |
371 | * s1 and ah. | |
372 | */ | |
373 | ||
28a220aa | 374 | static int smp_e(const u8 *k, u8 *r) |
d22ef0bc | 375 | { |
28a220aa | 376 | struct crypto_aes_ctx ctx; |
943a732a | 377 | uint8_t tmp[16], data[16]; |
201a5929 | 378 | int err; |
d22ef0bc | 379 | |
011c391a JH |
380 | SMP_DBG("k %16phN r %16phN", k, r); |
381 | ||
943a732a | 382 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 383 | swap_buf(k, tmp, 16); |
943a732a | 384 | |
28a220aa | 385 | err = aes_expandkey(&ctx, tmp, 16); |
d22ef0bc AB |
386 | if (err) { |
387 | BT_ERR("cipher setkey failed: %d", err); | |
388 | return err; | |
389 | } | |
390 | ||
943a732a | 391 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 392 | swap_buf(r, data, 16); |
943a732a | 393 | |
28a220aa | 394 | aes_encrypt(&ctx, data, data); |
d22ef0bc | 395 | |
943a732a | 396 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 397 | swap_buf(data, r, 16); |
943a732a | 398 | |
011c391a JH |
399 | SMP_DBG("r %16phN", r); |
400 | ||
c29fb5f6 | 401 | memzero_explicit(&ctx, sizeof(ctx)); |
d22ef0bc AB |
402 | return err; |
403 | } | |
404 | ||
28a220aa | 405 | static int smp_c1(const u8 k[16], |
06edf8de JH |
406 | const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat, |
407 | const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16]) | |
6a77083a | 408 | { |
06edf8de | 409 | u8 p1[16], p2[16]; |
6a77083a JH |
410 | int err; |
411 | ||
011c391a JH |
412 | SMP_DBG("k %16phN r %16phN", k, r); |
413 | SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra); | |
414 | SMP_DBG("preq %7phN pres %7phN", preq, pres); | |
415 | ||
06edf8de | 416 | memset(p1, 0, 16); |
6a77083a | 417 | |
06edf8de JH |
418 | /* p1 = pres || preq || _rat || _iat */ |
419 | p1[0] = _iat; | |
420 | p1[1] = _rat; | |
421 | memcpy(p1 + 2, preq, 7); | |
422 | memcpy(p1 + 9, pres, 7); | |
423 | ||
011c391a | 424 | SMP_DBG("p1 %16phN", p1); |
06edf8de JH |
425 | |
426 | /* res = r XOR p1 */ | |
ef0bb5ad | 427 | crypto_xor_cpy(res, r, p1, sizeof(p1)); |
06edf8de JH |
428 | |
429 | /* res = e(k, res) */ | |
28a220aa | 430 | err = smp_e(k, res); |
06edf8de JH |
431 | if (err) { |
432 | BT_ERR("Encrypt data error"); | |
6a77083a | 433 | return err; |
06edf8de | 434 | } |
6a77083a | 435 | |
011c391a JH |
436 | /* p2 = padding || ia || ra */ |
437 | memcpy(p2, ra, 6); | |
438 | memcpy(p2 + 6, ia, 6); | |
439 | memset(p2 + 12, 0, 4); | |
440 | ||
441 | SMP_DBG("p2 %16phN", p2); | |
442 | ||
06edf8de | 443 | /* res = res XOR p2 */ |
ef0bb5ad | 444 | crypto_xor(res, p2, sizeof(p2)); |
06edf8de JH |
445 | |
446 | /* res = e(k, res) */ | |
28a220aa | 447 | err = smp_e(k, res); |
06edf8de JH |
448 | if (err) |
449 | BT_ERR("Encrypt data error"); | |
450 | ||
451 | return err; | |
452 | } | |
453 | ||
28a220aa | 454 | static int smp_s1(const u8 k[16], |
06edf8de JH |
455 | const u8 r1[16], const u8 r2[16], u8 _r[16]) |
456 | { | |
457 | int err; | |
458 | ||
459 | /* Just least significant octets from r1 and r2 are considered */ | |
460 | memcpy(_r, r2, 8); | |
461 | memcpy(_r + 8, r1, 8); | |
462 | ||
28a220aa | 463 | err = smp_e(k, _r); |
06edf8de JH |
464 | if (err) |
465 | BT_ERR("Encrypt data error"); | |
6a77083a JH |
466 | |
467 | return err; | |
468 | } | |
469 | ||
28a220aa | 470 | static int smp_ah(const u8 irk[16], const u8 r[3], u8 res[3]) |
60478054 | 471 | { |
943a732a | 472 | u8 _res[16]; |
60478054 JH |
473 | int err; |
474 | ||
475 | /* r' = padding || r */ | |
943a732a JH |
476 | memcpy(_res, r, 3); |
477 | memset(_res + 3, 0, 13); | |
60478054 | 478 | |
28a220aa | 479 | err = smp_e(irk, _res); |
60478054 JH |
480 | if (err) { |
481 | BT_ERR("Encrypt error"); | |
482 | return err; | |
483 | } | |
484 | ||
485 | /* The output of the random address function ah is: | |
c5080d42 | 486 | * ah(k, r) = e(k, r') mod 2^24 |
60478054 JH |
487 | * The output of the security function e is then truncated to 24 bits |
488 | * by taking the least significant 24 bits of the output of e as the | |
489 | * result of ah. | |
490 | */ | |
943a732a | 491 | memcpy(res, _res, 3); |
60478054 JH |
492 | |
493 | return 0; | |
494 | } | |
495 | ||
cd082797 JH |
496 | bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], |
497 | const bdaddr_t *bdaddr) | |
60478054 | 498 | { |
defce9e8 | 499 | struct l2cap_chan *chan = hdev->smp_data; |
60478054 JH |
500 | u8 hash[3]; |
501 | int err; | |
502 | ||
defce9e8 JH |
503 | if (!chan || !chan->data) |
504 | return false; | |
505 | ||
56860245 | 506 | bt_dev_dbg(hdev, "RPA %pMR IRK %*phN", bdaddr, 16, irk); |
60478054 | 507 | |
28a220aa | 508 | err = smp_ah(irk, &bdaddr->b[3], hash); |
60478054 JH |
509 | if (err) |
510 | return false; | |
511 | ||
329d8230 | 512 | return !crypto_memneq(bdaddr->b, hash, 3); |
60478054 JH |
513 | } |
514 | ||
cd082797 | 515 | int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 516 | { |
defce9e8 | 517 | struct l2cap_chan *chan = hdev->smp_data; |
b1e2b3ae JH |
518 | int err; |
519 | ||
defce9e8 JH |
520 | if (!chan || !chan->data) |
521 | return -EOPNOTSUPP; | |
522 | ||
b1e2b3ae JH |
523 | get_random_bytes(&rpa->b[3], 3); |
524 | ||
525 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
526 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
527 | ||
28a220aa | 528 | err = smp_ah(irk, &rpa->b[3], rpa->b); |
b1e2b3ae JH |
529 | if (err < 0) |
530 | return err; | |
531 | ||
56860245 | 532 | bt_dev_dbg(hdev, "RPA %pMR", rpa); |
b1e2b3ae JH |
533 | |
534 | return 0; | |
535 | } | |
536 | ||
60a27d65 MH |
537 | int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]) |
538 | { | |
539 | struct l2cap_chan *chan = hdev->smp_data; | |
540 | struct smp_dev *smp; | |
541 | int err; | |
542 | ||
543 | if (!chan || !chan->data) | |
544 | return -EOPNOTSUPP; | |
545 | ||
546 | smp = chan->data; | |
547 | ||
548 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { | |
56860245 | 549 | bt_dev_dbg(hdev, "Using debug keys"); |
c0153b0b TA |
550 | err = set_ecdh_privkey(smp->tfm_ecdh, debug_sk); |
551 | if (err) | |
552 | return err; | |
60a27d65 | 553 | memcpy(smp->local_pk, debug_pk, 64); |
60a27d65 MH |
554 | smp->debug_key = true; |
555 | } else { | |
556 | while (true) { | |
c0153b0b TA |
557 | /* Generate key pair for Secure Connections */ |
558 | err = generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk); | |
a2976416 TA |
559 | if (err) |
560 | return err; | |
60a27d65 MH |
561 | |
562 | /* This is unlikely, but we need to check that | |
91641b79 | 563 | * we didn't accidentally generate a debug key. |
60a27d65 | 564 | */ |
c0153b0b | 565 | if (crypto_memneq(smp->local_pk, debug_pk, 64)) |
60a27d65 MH |
566 | break; |
567 | } | |
568 | smp->debug_key = false; | |
569 | } | |
570 | ||
571 | SMP_DBG("OOB Public Key X: %32phN", smp->local_pk); | |
572 | SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32); | |
60a27d65 | 573 | |
fb334fee | 574 | get_random_bytes(smp->local_rand, 16); |
60a27d65 MH |
575 | |
576 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk, | |
fb334fee | 577 | smp->local_rand, 0, hash); |
60a27d65 MH |
578 | if (err < 0) |
579 | return err; | |
580 | ||
fb334fee | 581 | memcpy(rand, smp->local_rand, 16); |
60a27d65 | 582 | |
94f14e47 JH |
583 | smp->local_oob = true; |
584 | ||
60a27d65 MH |
585 | return 0; |
586 | } | |
587 | ||
5d88cc73 | 588 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 589 | { |
5d88cc73 | 590 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 591 | struct smp_chan *smp; |
5d88cc73 JH |
592 | struct kvec iv[2]; |
593 | struct msghdr msg; | |
eb492e01 | 594 | |
5d88cc73 JH |
595 | if (!chan) |
596 | return; | |
eb492e01 | 597 | |
2e1614f7 | 598 | bt_dev_dbg(conn->hcon->hdev, "code 0x%2.2x", code); |
eb492e01 | 599 | |
5d88cc73 JH |
600 | iv[0].iov_base = &code; |
601 | iv[0].iov_len = 1; | |
eb492e01 | 602 | |
5d88cc73 JH |
603 | iv[1].iov_base = data; |
604 | iv[1].iov_len = len; | |
eb492e01 | 605 | |
5d88cc73 | 606 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 607 | |
aa563d7b | 608 | iov_iter_kvec(&msg.msg_iter, WRITE, iv, 2, 1 + len); |
eb492e01 | 609 | |
5d88cc73 | 610 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 611 | |
b68fda68 JH |
612 | if (!chan->data) |
613 | return; | |
614 | ||
615 | smp = chan->data; | |
616 | ||
617 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 618 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
619 | } |
620 | ||
d2eb9e10 | 621 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 622 | { |
d2eb9e10 JH |
623 | if (authreq & SMP_AUTH_MITM) { |
624 | if (authreq & SMP_AUTH_SC) | |
625 | return BT_SECURITY_FIPS; | |
626 | else | |
627 | return BT_SECURITY_HIGH; | |
628 | } else { | |
2b64d153 | 629 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 630 | } |
2b64d153 BG |
631 | } |
632 | ||
633 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
634 | { | |
635 | switch (sec_level) { | |
d2eb9e10 | 636 | case BT_SECURITY_FIPS: |
2b64d153 BG |
637 | case BT_SECURITY_HIGH: |
638 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
639 | case BT_SECURITY_MEDIUM: | |
640 | return SMP_AUTH_BONDING; | |
641 | default: | |
642 | return SMP_AUTH_NONE; | |
643 | } | |
644 | } | |
645 | ||
b8e66eac | 646 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
647 | struct smp_cmd_pairing *req, |
648 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 649 | { |
5d88cc73 JH |
650 | struct l2cap_chan *chan = conn->smp; |
651 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
652 | struct hci_conn *hcon = conn->hcon; |
653 | struct hci_dev *hdev = hcon->hdev; | |
02b05bd8 | 654 | u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT; |
54790f73 | 655 | |
d7a5a11d | 656 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
7ee4ea36 MH |
657 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
658 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 659 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
660 | } else { |
661 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
662 | } |
663 | ||
d7a5a11d | 664 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
fd349c02 JH |
665 | remote_dist |= SMP_DIST_ID_KEY; |
666 | ||
d7a5a11d | 667 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
863efaf2 JH |
668 | local_dist |= SMP_DIST_ID_KEY; |
669 | ||
d7a5a11d | 670 | if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) && |
02b05bd8 JH |
671 | (authreq & SMP_AUTH_SC)) { |
672 | struct oob_data *oob_data; | |
673 | u8 bdaddr_type; | |
674 | ||
d7a5a11d | 675 | if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) { |
df8e1a4c JH |
676 | local_dist |= SMP_DIST_LINK_KEY; |
677 | remote_dist |= SMP_DIST_LINK_KEY; | |
678 | } | |
02b05bd8 JH |
679 | |
680 | if (hcon->dst_type == ADDR_LE_DEV_PUBLIC) | |
681 | bdaddr_type = BDADDR_LE_PUBLIC; | |
682 | else | |
683 | bdaddr_type = BDADDR_LE_RANDOM; | |
684 | ||
685 | oob_data = hci_find_remote_oob_data(hdev, &hcon->dst, | |
686 | bdaddr_type); | |
4775a4ea | 687 | if (oob_data && oob_data->present) { |
1a8bab4f | 688 | set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags); |
02b05bd8 | 689 | oob_flag = SMP_OOB_PRESENT; |
a29b0733 | 690 | memcpy(smp->rr, oob_data->rand256, 16); |
02b05bd8 | 691 | memcpy(smp->pcnf, oob_data->hash256, 16); |
bc07cd69 MH |
692 | SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf); |
693 | SMP_DBG("OOB Remote Random: %16phN", smp->rr); | |
02b05bd8 JH |
694 | } |
695 | ||
df8e1a4c JH |
696 | } else { |
697 | authreq &= ~SMP_AUTH_SC; | |
698 | } | |
699 | ||
54790f73 VCG |
700 | if (rsp == NULL) { |
701 | req->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 702 | req->oob_flag = oob_flag; |
30d65e08 | 703 | req->max_key_size = hdev->le_max_key_size; |
fd349c02 JH |
704 | req->init_key_dist = local_dist; |
705 | req->resp_key_dist = remote_dist; | |
0edb14de | 706 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
707 | |
708 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
709 | return; |
710 | } | |
711 | ||
712 | rsp->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 713 | rsp->oob_flag = oob_flag; |
30d65e08 | 714 | rsp->max_key_size = hdev->le_max_key_size; |
fd349c02 JH |
715 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
716 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 717 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
718 | |
719 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
720 | } |
721 | ||
3158c50c VCG |
722 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
723 | { | |
5d88cc73 | 724 | struct l2cap_chan *chan = conn->smp; |
2fd36558 | 725 | struct hci_dev *hdev = conn->hcon->hdev; |
5d88cc73 | 726 | struct smp_chan *smp = chan->data; |
1c1def09 | 727 | |
49c06c9e ŁR |
728 | if (conn->hcon->pending_sec_level == BT_SECURITY_FIPS && |
729 | max_key_size != SMP_MAX_ENC_KEY_SIZE) | |
730 | return SMP_ENC_KEY_SIZE; | |
731 | ||
30d65e08 | 732 | if (max_key_size > hdev->le_max_key_size || |
2fd36558 | 733 | max_key_size < SMP_MIN_ENC_KEY_SIZE) |
3158c50c VCG |
734 | return SMP_ENC_KEY_SIZE; |
735 | ||
f7aa611a | 736 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
737 | |
738 | return 0; | |
739 | } | |
740 | ||
6f48e260 JH |
741 | static void smp_chan_destroy(struct l2cap_conn *conn) |
742 | { | |
743 | struct l2cap_chan *chan = conn->smp; | |
744 | struct smp_chan *smp = chan->data; | |
923e2414 | 745 | struct hci_conn *hcon = conn->hcon; |
6f48e260 JH |
746 | bool complete; |
747 | ||
748 | BUG_ON(!smp); | |
749 | ||
750 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 751 | |
6f48e260 | 752 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
923e2414 | 753 | mgmt_smp_complete(hcon, complete); |
6f48e260 | 754 | |
453431a5 | 755 | kfree_sensitive(smp->csrk); |
fad646e1 | 756 | kfree_sensitive(smp->responder_csrk); |
453431a5 | 757 | kfree_sensitive(smp->link_key); |
6f48e260 | 758 | |
71af2f6b | 759 | crypto_free_shash(smp->tfm_cmac); |
47eb2ac8 | 760 | crypto_free_kpp(smp->tfm_ecdh); |
6f48e260 | 761 | |
923e2414 JH |
762 | /* Ensure that we don't leave any debug key around if debug key |
763 | * support hasn't been explicitly enabled. | |
764 | */ | |
765 | if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG && | |
d7a5a11d | 766 | !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) { |
923e2414 JH |
767 | list_del_rcu(&smp->ltk->list); |
768 | kfree_rcu(smp->ltk, rcu); | |
769 | smp->ltk = NULL; | |
770 | } | |
771 | ||
6f48e260 JH |
772 | /* If pairing failed clean up any keys we might have */ |
773 | if (!complete) { | |
774 | if (smp->ltk) { | |
970d0f1b JH |
775 | list_del_rcu(&smp->ltk->list); |
776 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
777 | } |
778 | ||
fad646e1 AP |
779 | if (smp->responder_ltk) { |
780 | list_del_rcu(&smp->responder_ltk->list); | |
781 | kfree_rcu(smp->responder_ltk, rcu); | |
6f48e260 JH |
782 | } |
783 | ||
784 | if (smp->remote_irk) { | |
adae20cb JH |
785 | list_del_rcu(&smp->remote_irk->list); |
786 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
787 | } |
788 | } | |
789 | ||
790 | chan->data = NULL; | |
453431a5 | 791 | kfree_sensitive(smp); |
923e2414 | 792 | hci_conn_drop(hcon); |
6f48e260 JH |
793 | } |
794 | ||
84794e11 | 795 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 796 | { |
bab73cb6 | 797 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 798 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 799 | |
84794e11 | 800 | if (reason) |
4f957a76 | 801 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 802 | &reason); |
4f957a76 | 803 | |
e1e930f5 | 804 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 805 | |
fc75cc86 | 806 | if (chan->data) |
f1c09c07 | 807 | smp_chan_destroy(conn); |
4f957a76 BG |
808 | } |
809 | ||
2b64d153 BG |
810 | #define JUST_WORKS 0x00 |
811 | #define JUST_CFM 0x01 | |
812 | #define REQ_PASSKEY 0x02 | |
813 | #define CFM_PASSKEY 0x03 | |
814 | #define REQ_OOB 0x04 | |
5e3d3d9b | 815 | #define DSP_PASSKEY 0x05 |
2b64d153 BG |
816 | #define OVERLAP 0xFF |
817 | ||
818 | static const u8 gen_method[5][5] = { | |
819 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
820 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
821 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
822 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
823 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
824 | }; | |
825 | ||
5e3d3d9b JH |
826 | static const u8 sc_method[5][5] = { |
827 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
828 | { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
829 | { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY }, | |
830 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
831 | { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
832 | }; | |
833 | ||
581370cc JH |
834 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
835 | { | |
2bcd4003 JH |
836 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
837 | * converted later to JUST_WORKS if we're initiators. | |
838 | */ | |
581370cc JH |
839 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
840 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 841 | return JUST_CFM; |
581370cc | 842 | |
5e3d3d9b JH |
843 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
844 | return sc_method[remote_io][local_io]; | |
845 | ||
581370cc JH |
846 | return gen_method[remote_io][local_io]; |
847 | } | |
848 | ||
2b64d153 BG |
849 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
850 | u8 local_io, u8 remote_io) | |
851 | { | |
852 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
853 | struct l2cap_chan *chan = conn->smp; |
854 | struct smp_chan *smp = chan->data; | |
2b64d153 | 855 | u32 passkey = 0; |
d1d900f8 | 856 | int ret; |
2b64d153 BG |
857 | |
858 | /* Initialize key for JUST WORKS */ | |
859 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 860 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 | 861 | |
83b4b195 | 862 | bt_dev_dbg(hcon->hdev, "auth:%u lcl:%u rem:%u", auth, local_io, |
2e1614f7 | 863 | remote_io); |
2b64d153 | 864 | |
2bcd4003 JH |
865 | /* If neither side wants MITM, either "just" confirm an incoming |
866 | * request or use just-works for outgoing ones. The JUST_CFM | |
867 | * will be converted to JUST_WORKS if necessary later in this | |
868 | * function. If either side has MITM look up the method from the | |
869 | * table. | |
870 | */ | |
581370cc | 871 | if (!(auth & SMP_AUTH_MITM)) |
783e0574 | 872 | smp->method = JUST_CFM; |
2b64d153 | 873 | else |
783e0574 | 874 | smp->method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 875 | |
a82505c7 | 876 | /* Don't confirm locally initiated pairing attempts */ |
783e0574 JH |
877 | if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, |
878 | &smp->flags)) | |
879 | smp->method = JUST_WORKS; | |
a82505c7 | 880 | |
02f3e254 | 881 | /* Don't bother user space with no IO capabilities */ |
783e0574 JH |
882 | if (smp->method == JUST_CFM && |
883 | hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
884 | smp->method = JUST_WORKS; | |
02f3e254 | 885 | |
92516cd9 SS |
886 | /* If Just Works, Continue with Zero TK and ask user-space for |
887 | * confirmation */ | |
783e0574 | 888 | if (smp->method == JUST_WORKS) { |
d1d900f8 | 889 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
92516cd9 SS |
890 | hcon->type, |
891 | hcon->dst_type, | |
892 | passkey, 1); | |
d1d900f8 GR |
893 | if (ret) |
894 | return ret; | |
92516cd9 | 895 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2b64d153 BG |
896 | return 0; |
897 | } | |
898 | ||
19c5ce9c JH |
899 | /* If this function is used for SC -> legacy fallback we |
900 | * can only recover the just-works case. | |
901 | */ | |
902 | if (test_bit(SMP_FLAG_SC, &smp->flags)) | |
903 | return -EINVAL; | |
904 | ||
2b64d153 | 905 | /* Not Just Works/Confirm results in MITM Authentication */ |
783e0574 | 906 | if (smp->method != JUST_CFM) { |
4a74d658 | 907 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
908 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
909 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
910 | } | |
2b64d153 | 911 | |
74be523c AP |
912 | /* If both devices have Keyboard-Display I/O, the initiator |
913 | * Confirms and the responder Enters the passkey. | |
2b64d153 | 914 | */ |
783e0574 | 915 | if (smp->method == OVERLAP) { |
40bef302 | 916 | if (hcon->role == HCI_ROLE_MASTER) |
783e0574 | 917 | smp->method = CFM_PASSKEY; |
2b64d153 | 918 | else |
783e0574 | 919 | smp->method = REQ_PASSKEY; |
2b64d153 BG |
920 | } |
921 | ||
01ad34d2 | 922 | /* Generate random passkey. */ |
783e0574 | 923 | if (smp->method == CFM_PASSKEY) { |
943a732a | 924 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
925 | get_random_bytes(&passkey, sizeof(passkey)); |
926 | passkey %= 1000000; | |
943a732a | 927 | put_unaligned_le32(passkey, smp->tk); |
83b4b195 | 928 | bt_dev_dbg(hcon->hdev, "PassKey: %u", passkey); |
4a74d658 | 929 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
930 | } |
931 | ||
783e0574 | 932 | if (smp->method == REQ_PASSKEY) |
ce39fb4e | 933 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 934 | hcon->type, hcon->dst_type); |
783e0574 | 935 | else if (smp->method == JUST_CFM) |
4eb65e66 JH |
936 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
937 | hcon->type, hcon->dst_type, | |
938 | passkey, 1); | |
2b64d153 | 939 | else |
01ad34d2 | 940 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 941 | hcon->type, hcon->dst_type, |
39adbffe | 942 | passkey, 0); |
2b64d153 | 943 | |
2b64d153 BG |
944 | return ret; |
945 | } | |
946 | ||
1cc61144 | 947 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 948 | { |
8aab4757 | 949 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
950 | struct smp_cmd_pairing_confirm cp; |
951 | int ret; | |
8aab4757 | 952 | |
2e1614f7 | 953 | bt_dev_dbg(conn->hcon->hdev, "conn %p", conn); |
8aab4757 | 954 | |
28a220aa | 955 | ret = smp_c1(smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 956 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
957 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
958 | cp.confirm_val); | |
1cc61144 JH |
959 | if (ret) |
960 | return SMP_UNSPECIFIED; | |
8aab4757 | 961 | |
4a74d658 | 962 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 963 | |
8aab4757 VCG |
964 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
965 | ||
b28b4943 JH |
966 | if (conn->hcon->out) |
967 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
968 | else | |
969 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
970 | ||
1cc61144 | 971 | return 0; |
8aab4757 VCG |
972 | } |
973 | ||
861580a9 | 974 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 975 | { |
8aab4757 VCG |
976 | struct l2cap_conn *conn = smp->conn; |
977 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 978 | u8 confirm[16]; |
8aab4757 VCG |
979 | int ret; |
980 | ||
2e1614f7 | 981 | bt_dev_dbg(conn->hcon->hdev, "conn %p %s", conn, |
fad646e1 | 982 | conn->hcon->out ? "initiator" : "responder"); |
8aab4757 | 983 | |
28a220aa | 984 | ret = smp_c1(smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 985 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 986 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
987 | if (ret) |
988 | return SMP_UNSPECIFIED; | |
8aab4757 | 989 | |
329d8230 | 990 | if (crypto_memneq(smp->pcnf, confirm, sizeof(smp->pcnf))) { |
2064ee33 MH |
991 | bt_dev_err(hcon->hdev, "pairing failed " |
992 | "(confirmation values mismatch)"); | |
861580a9 | 993 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
994 | } |
995 | ||
996 | if (hcon->out) { | |
fe39c7b2 MH |
997 | u8 stk[16]; |
998 | __le64 rand = 0; | |
999 | __le16 ediv = 0; | |
8aab4757 | 1000 | |
28a220aa | 1001 | smp_s1(smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 1002 | |
861580a9 JH |
1003 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
1004 | return SMP_UNSPECIFIED; | |
8aab4757 | 1005 | |
8b76ce34 | 1006 | hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size); |
f7aa611a | 1007 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 1008 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 1009 | } else { |
fff3490f | 1010 | u8 stk[16], auth; |
fe39c7b2 MH |
1011 | __le64 rand = 0; |
1012 | __le16 ediv = 0; | |
8aab4757 | 1013 | |
943a732a JH |
1014 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1015 | smp->prnd); | |
8aab4757 | 1016 | |
28a220aa | 1017 | smp_s1(smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 1018 | |
fff3490f JH |
1019 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
1020 | auth = 1; | |
1021 | else | |
1022 | auth = 0; | |
1023 | ||
fad646e1 AP |
1024 | /* Even though there's no _RESPONDER suffix this is the |
1025 | * responder STK we're adding for later lookup (the initiator | |
7d5843b7 JH |
1026 | * STK never needs to be stored). |
1027 | */ | |
ce39fb4e | 1028 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1029 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
1030 | } |
1031 | ||
861580a9 | 1032 | return 0; |
8aab4757 VCG |
1033 | } |
1034 | ||
44f1a7ab JH |
1035 | static void smp_notify_keys(struct l2cap_conn *conn) |
1036 | { | |
1037 | struct l2cap_chan *chan = conn->smp; | |
1038 | struct smp_chan *smp = chan->data; | |
1039 | struct hci_conn *hcon = conn->hcon; | |
1040 | struct hci_dev *hdev = hcon->hdev; | |
1041 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
1042 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1043 | bool persistent; | |
1044 | ||
cad20c27 JH |
1045 | if (hcon->type == ACL_LINK) { |
1046 | if (hcon->key_type == HCI_LK_DEBUG_COMBINATION) | |
1047 | persistent = false; | |
1048 | else | |
1049 | persistent = !test_bit(HCI_CONN_FLUSH_KEY, | |
1050 | &hcon->flags); | |
1051 | } else { | |
1052 | /* The LTKs, IRKs and CSRKs should be persistent only if | |
1053 | * both sides had the bonding bit set in their | |
1054 | * authentication requests. | |
1055 | */ | |
1056 | persistent = !!((req->auth_req & rsp->auth_req) & | |
1057 | SMP_AUTH_BONDING); | |
1058 | } | |
1059 | ||
44f1a7ab | 1060 | if (smp->remote_irk) { |
cad20c27 JH |
1061 | mgmt_new_irk(hdev, smp->remote_irk, persistent); |
1062 | ||
44f1a7ab JH |
1063 | /* Now that user space can be considered to know the |
1064 | * identity address track the connection based on it | |
b5ae344d | 1065 | * from now on (assuming this is an LE link). |
44f1a7ab | 1066 | */ |
b5ae344d JH |
1067 | if (hcon->type == LE_LINK) { |
1068 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1069 | hcon->dst_type = smp->remote_irk->addr_type; | |
1070 | queue_work(hdev->workqueue, &conn->id_addr_update_work); | |
1071 | } | |
44f1a7ab JH |
1072 | } |
1073 | ||
44f1a7ab JH |
1074 | if (smp->csrk) { |
1075 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1076 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
1077 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
1078 | } | |
1079 | ||
fad646e1 AP |
1080 | if (smp->responder_csrk) { |
1081 | smp->responder_csrk->bdaddr_type = hcon->dst_type; | |
1082 | bacpy(&smp->responder_csrk->bdaddr, &hcon->dst); | |
1083 | mgmt_new_csrk(hdev, smp->responder_csrk, persistent); | |
44f1a7ab JH |
1084 | } |
1085 | ||
1086 | if (smp->ltk) { | |
1087 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1088 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
1089 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
1090 | } | |
1091 | ||
fad646e1 AP |
1092 | if (smp->responder_ltk) { |
1093 | smp->responder_ltk->bdaddr_type = hcon->dst_type; | |
1094 | bacpy(&smp->responder_ltk->bdaddr, &hcon->dst); | |
1095 | mgmt_new_ltk(hdev, smp->responder_ltk, persistent); | |
44f1a7ab | 1096 | } |
6a77083a JH |
1097 | |
1098 | if (smp->link_key) { | |
e3befab9 JH |
1099 | struct link_key *key; |
1100 | u8 type; | |
1101 | ||
1102 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1103 | type = HCI_LK_DEBUG_COMBINATION; | |
1104 | else if (hcon->sec_level == BT_SECURITY_FIPS) | |
1105 | type = HCI_LK_AUTH_COMBINATION_P256; | |
1106 | else | |
1107 | type = HCI_LK_UNAUTH_COMBINATION_P256; | |
1108 | ||
1109 | key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst, | |
1110 | smp->link_key, type, 0, &persistent); | |
1111 | if (key) { | |
1112 | mgmt_new_link_key(hdev, key, persistent); | |
1113 | ||
1114 | /* Don't keep debug keys around if the relevant | |
1115 | * flag is not set. | |
1116 | */ | |
d7a5a11d | 1117 | if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) && |
e3befab9 JH |
1118 | key->type == HCI_LK_DEBUG_COMBINATION) { |
1119 | list_del_rcu(&key->list); | |
1120 | kfree_rcu(key, rcu); | |
1121 | } | |
1122 | } | |
6a77083a JH |
1123 | } |
1124 | } | |
1125 | ||
d3e54a87 JH |
1126 | static void sc_add_ltk(struct smp_chan *smp) |
1127 | { | |
1128 | struct hci_conn *hcon = smp->conn->hcon; | |
1129 | u8 key_type, auth; | |
1130 | ||
1131 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1132 | key_type = SMP_LTK_P256_DEBUG; | |
1133 | else | |
1134 | key_type = SMP_LTK_P256; | |
1135 | ||
1136 | if (hcon->pending_sec_level == BT_SECURITY_FIPS) | |
1137 | auth = 1; | |
1138 | else | |
1139 | auth = 0; | |
1140 | ||
d3e54a87 JH |
1141 | smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
1142 | key_type, auth, smp->tk, smp->enc_key_size, | |
1143 | 0, 0); | |
1144 | } | |
1145 | ||
6a77083a JH |
1146 | static void sc_generate_link_key(struct smp_chan *smp) |
1147 | { | |
a62da6f1 | 1148 | /* From core spec. Spells out in ASCII as 'lebr'. */ |
6a77083a JH |
1149 | const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c }; |
1150 | ||
1151 | smp->link_key = kzalloc(16, GFP_KERNEL); | |
1152 | if (!smp->link_key) | |
1153 | return; | |
1154 | ||
a62da6f1 | 1155 | if (test_bit(SMP_FLAG_CT2, &smp->flags)) { |
151129df | 1156 | /* SALT = 0x000000000000000000000000746D7031 */ |
a62da6f1 JH |
1157 | const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 }; |
1158 | ||
1159 | if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) { | |
453431a5 | 1160 | kfree_sensitive(smp->link_key); |
a62da6f1 JH |
1161 | smp->link_key = NULL; |
1162 | return; | |
1163 | } | |
1164 | } else { | |
1165 | /* From core spec. Spells out in ASCII as 'tmp1'. */ | |
1166 | const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1167 | ||
1168 | if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) { | |
453431a5 | 1169 | kfree_sensitive(smp->link_key); |
a62da6f1 JH |
1170 | smp->link_key = NULL; |
1171 | return; | |
1172 | } | |
6a77083a JH |
1173 | } |
1174 | ||
1175 | if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) { | |
453431a5 | 1176 | kfree_sensitive(smp->link_key); |
6a77083a JH |
1177 | smp->link_key = NULL; |
1178 | return; | |
1179 | } | |
44f1a7ab JH |
1180 | } |
1181 | ||
b28b4943 JH |
1182 | static void smp_allow_key_dist(struct smp_chan *smp) |
1183 | { | |
1184 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
1185 | * will be allowed in each PDU handler to ensure we receive | |
1186 | * them in the correct order. | |
1187 | */ | |
1188 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
1189 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
1190 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
1191 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
1192 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
1193 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1194 | } | |
1195 | ||
b5ae344d JH |
1196 | static void sc_generate_ltk(struct smp_chan *smp) |
1197 | { | |
a62da6f1 | 1198 | /* From core spec. Spells out in ASCII as 'brle'. */ |
b5ae344d JH |
1199 | const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 }; |
1200 | struct hci_conn *hcon = smp->conn->hcon; | |
1201 | struct hci_dev *hdev = hcon->hdev; | |
1202 | struct link_key *key; | |
1203 | ||
1204 | key = hci_find_link_key(hdev, &hcon->dst); | |
1205 | if (!key) { | |
2064ee33 | 1206 | bt_dev_err(hdev, "no Link Key found to generate LTK"); |
b5ae344d JH |
1207 | return; |
1208 | } | |
1209 | ||
1210 | if (key->type == HCI_LK_DEBUG_COMBINATION) | |
1211 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1212 | ||
a62da6f1 | 1213 | if (test_bit(SMP_FLAG_CT2, &smp->flags)) { |
151129df | 1214 | /* SALT = 0x000000000000000000000000746D7032 */ |
a62da6f1 JH |
1215 | const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 }; |
1216 | ||
1217 | if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk)) | |
1218 | return; | |
1219 | } else { | |
1220 | /* From core spec. Spells out in ASCII as 'tmp2'. */ | |
1221 | const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1222 | ||
1223 | if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk)) | |
1224 | return; | |
1225 | } | |
b5ae344d JH |
1226 | |
1227 | if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk)) | |
1228 | return; | |
1229 | ||
1230 | sc_add_ltk(smp); | |
1231 | } | |
1232 | ||
d6268e86 | 1233 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
1234 | { |
1235 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 1236 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
1237 | struct hci_conn *hcon = conn->hcon; |
1238 | struct hci_dev *hdev = hcon->hdev; | |
1239 | __u8 *keydist; | |
1240 | ||
2e1614f7 | 1241 | bt_dev_dbg(hdev, "conn %p", conn); |
44f1a7ab | 1242 | |
44f1a7ab JH |
1243 | rsp = (void *) &smp->prsp[1]; |
1244 | ||
1245 | /* The responder sends its keys first */ | |
b28b4943 JH |
1246 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
1247 | smp_allow_key_dist(smp); | |
86d1407c | 1248 | return; |
b28b4943 | 1249 | } |
44f1a7ab JH |
1250 | |
1251 | req = (void *) &smp->preq[1]; | |
1252 | ||
1253 | if (hcon->out) { | |
1254 | keydist = &rsp->init_key_dist; | |
1255 | *keydist &= req->init_key_dist; | |
1256 | } else { | |
1257 | keydist = &rsp->resp_key_dist; | |
1258 | *keydist &= req->resp_key_dist; | |
1259 | } | |
1260 | ||
6a77083a | 1261 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
b5ae344d | 1262 | if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY)) |
6a77083a | 1263 | sc_generate_link_key(smp); |
b5ae344d JH |
1264 | if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY)) |
1265 | sc_generate_ltk(smp); | |
6a77083a JH |
1266 | |
1267 | /* Clear the keys which are generated but not distributed */ | |
1268 | *keydist &= ~SMP_SC_NO_DIST; | |
1269 | } | |
1270 | ||
2e1614f7 | 1271 | bt_dev_dbg(hdev, "keydist 0x%x", *keydist); |
44f1a7ab JH |
1272 | |
1273 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1274 | struct smp_cmd_encrypt_info enc; | |
fad646e1 | 1275 | struct smp_cmd_initiator_ident ident; |
44f1a7ab JH |
1276 | struct smp_ltk *ltk; |
1277 | u8 authenticated; | |
1278 | __le16 ediv; | |
1279 | __le64 rand; | |
1280 | ||
1fc62c52 JH |
1281 | /* Make sure we generate only the significant amount of |
1282 | * bytes based on the encryption key size, and set the rest | |
1283 | * of the value to zeroes. | |
1284 | */ | |
1285 | get_random_bytes(enc.ltk, smp->enc_key_size); | |
1286 | memset(enc.ltk + smp->enc_key_size, 0, | |
1287 | sizeof(enc.ltk) - smp->enc_key_size); | |
1288 | ||
44f1a7ab JH |
1289 | get_random_bytes(&ediv, sizeof(ediv)); |
1290 | get_random_bytes(&rand, sizeof(rand)); | |
1291 | ||
1292 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1293 | ||
1294 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
1295 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
fad646e1 | 1296 | SMP_LTK_RESPONDER, authenticated, enc.ltk, |
44f1a7ab | 1297 | smp->enc_key_size, ediv, rand); |
fad646e1 | 1298 | smp->responder_ltk = ltk; |
44f1a7ab JH |
1299 | |
1300 | ident.ediv = ediv; | |
1301 | ident.rand = rand; | |
1302 | ||
fad646e1 AP |
1303 | smp_send_cmd(conn, SMP_CMD_INITIATOR_IDENT, sizeof(ident), |
1304 | &ident); | |
44f1a7ab JH |
1305 | |
1306 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1307 | } | |
1308 | ||
1309 | if (*keydist & SMP_DIST_ID_KEY) { | |
1310 | struct smp_cmd_ident_addr_info addrinfo; | |
1311 | struct smp_cmd_ident_info idinfo; | |
1312 | ||
1313 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
1314 | ||
1315 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1316 | ||
1317 | /* The hci_conn contains the local identity address | |
1318 | * after the connection has been established. | |
1319 | * | |
1320 | * This is true even when the connection has been | |
1321 | * established using a resolvable random address. | |
1322 | */ | |
1323 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
1324 | addrinfo.addr_type = hcon->src_type; | |
1325 | ||
1326 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1327 | &addrinfo); | |
1328 | ||
1329 | *keydist &= ~SMP_DIST_ID_KEY; | |
1330 | } | |
1331 | ||
1332 | if (*keydist & SMP_DIST_SIGN) { | |
1333 | struct smp_cmd_sign_info sign; | |
1334 | struct smp_csrk *csrk; | |
1335 | ||
1336 | /* Generate a new random key */ | |
1337 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1338 | ||
1339 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1340 | if (csrk) { | |
4cd3928a JH |
1341 | if (hcon->sec_level > BT_SECURITY_MEDIUM) |
1342 | csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED; | |
1343 | else | |
1344 | csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED; | |
44f1a7ab JH |
1345 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); |
1346 | } | |
fad646e1 | 1347 | smp->responder_csrk = csrk; |
44f1a7ab JH |
1348 | |
1349 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1350 | ||
1351 | *keydist &= ~SMP_DIST_SIGN; | |
1352 | } | |
1353 | ||
1354 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
1355 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
1356 | smp_allow_key_dist(smp); | |
86d1407c | 1357 | return; |
b28b4943 | 1358 | } |
44f1a7ab | 1359 | |
44f1a7ab JH |
1360 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1361 | smp_notify_keys(conn); | |
1362 | ||
1363 | smp_chan_destroy(conn); | |
44f1a7ab JH |
1364 | } |
1365 | ||
b68fda68 JH |
1366 | static void smp_timeout(struct work_struct *work) |
1367 | { | |
1368 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
1369 | security_timer.work); | |
1370 | struct l2cap_conn *conn = smp->conn; | |
1371 | ||
2e1614f7 | 1372 | bt_dev_dbg(conn->hcon->hdev, "conn %p", conn); |
b68fda68 | 1373 | |
1e91c29e | 1374 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
1375 | } |
1376 | ||
8aab4757 VCG |
1377 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
1378 | { | |
2e1614f7 | 1379 | struct hci_conn *hcon = conn->hcon; |
5d88cc73 | 1380 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
1381 | struct smp_chan *smp; |
1382 | ||
f1560463 | 1383 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 1384 | if (!smp) |
8aab4757 VCG |
1385 | return NULL; |
1386 | ||
71af2f6b | 1387 | smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
407cecf6 | 1388 | if (IS_ERR(smp->tfm_cmac)) { |
2e1614f7 | 1389 | bt_dev_err(hcon->hdev, "Unable to create CMAC crypto context"); |
28a220aa | 1390 | goto zfree_smp; |
47eb2ac8 TA |
1391 | } |
1392 | ||
6763f5ea | 1393 | smp->tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0); |
47eb2ac8 | 1394 | if (IS_ERR(smp->tfm_ecdh)) { |
2e1614f7 | 1395 | bt_dev_err(hcon->hdev, "Unable to create ECDH crypto context"); |
47eb2ac8 | 1396 | goto free_shash; |
407cecf6 JH |
1397 | } |
1398 | ||
8aab4757 | 1399 | smp->conn = conn; |
5d88cc73 | 1400 | chan->data = smp; |
8aab4757 | 1401 | |
b28b4943 JH |
1402 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
1403 | ||
b68fda68 JH |
1404 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
1405 | ||
2e1614f7 | 1406 | hci_conn_hold(hcon); |
8aab4757 VCG |
1407 | |
1408 | return smp; | |
47eb2ac8 TA |
1409 | |
1410 | free_shash: | |
1411 | crypto_free_shash(smp->tfm_cmac); | |
47eb2ac8 | 1412 | zfree_smp: |
453431a5 | 1413 | kfree_sensitive(smp); |
47eb2ac8 | 1414 | return NULL; |
8aab4757 VCG |
1415 | } |
1416 | ||
760b018b JH |
1417 | static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16]) |
1418 | { | |
1419 | struct hci_conn *hcon = smp->conn->hcon; | |
1420 | u8 *na, *nb, a[7], b[7]; | |
1421 | ||
1422 | if (hcon->out) { | |
1423 | na = smp->prnd; | |
1424 | nb = smp->rrnd; | |
1425 | } else { | |
1426 | na = smp->rrnd; | |
1427 | nb = smp->prnd; | |
1428 | } | |
1429 | ||
1430 | memcpy(a, &hcon->init_addr, 6); | |
1431 | memcpy(b, &hcon->resp_addr, 6); | |
1432 | a[6] = hcon->init_addr_type; | |
1433 | b[6] = hcon->resp_addr_type; | |
1434 | ||
1435 | return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk); | |
1436 | } | |
1437 | ||
38606f14 | 1438 | static void sc_dhkey_check(struct smp_chan *smp) |
760b018b JH |
1439 | { |
1440 | struct hci_conn *hcon = smp->conn->hcon; | |
1441 | struct smp_cmd_dhkey_check check; | |
1442 | u8 a[7], b[7], *local_addr, *remote_addr; | |
1443 | u8 io_cap[3], r[16]; | |
1444 | ||
760b018b JH |
1445 | memcpy(a, &hcon->init_addr, 6); |
1446 | memcpy(b, &hcon->resp_addr, 6); | |
1447 | a[6] = hcon->init_addr_type; | |
1448 | b[6] = hcon->resp_addr_type; | |
1449 | ||
1450 | if (hcon->out) { | |
1451 | local_addr = a; | |
1452 | remote_addr = b; | |
1453 | memcpy(io_cap, &smp->preq[1], 3); | |
1454 | } else { | |
1455 | local_addr = b; | |
1456 | remote_addr = a; | |
1457 | memcpy(io_cap, &smp->prsp[1], 3); | |
1458 | } | |
1459 | ||
dddd3059 JH |
1460 | memset(r, 0, sizeof(r)); |
1461 | ||
1462 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
38606f14 | 1463 | put_unaligned_le32(hcon->passkey_notify, r); |
760b018b | 1464 | |
a29b0733 JH |
1465 | if (smp->method == REQ_OOB) |
1466 | memcpy(r, smp->rr, 16); | |
1467 | ||
760b018b JH |
1468 | smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap, |
1469 | local_addr, remote_addr, check.e); | |
1470 | ||
1471 | smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check); | |
dddd3059 JH |
1472 | } |
1473 | ||
38606f14 JH |
1474 | static u8 sc_passkey_send_confirm(struct smp_chan *smp) |
1475 | { | |
1476 | struct l2cap_conn *conn = smp->conn; | |
1477 | struct hci_conn *hcon = conn->hcon; | |
1478 | struct smp_cmd_pairing_confirm cfm; | |
1479 | u8 r; | |
1480 | ||
1481 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1482 | r |= 0x80; | |
1483 | ||
1484 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); | |
1485 | ||
1486 | if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r, | |
1487 | cfm.confirm_val)) | |
1488 | return SMP_UNSPECIFIED; | |
1489 | ||
1490 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
1491 | ||
1492 | return 0; | |
1493 | } | |
1494 | ||
1495 | static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op) | |
1496 | { | |
1497 | struct l2cap_conn *conn = smp->conn; | |
1498 | struct hci_conn *hcon = conn->hcon; | |
1499 | struct hci_dev *hdev = hcon->hdev; | |
1500 | u8 cfm[16], r; | |
1501 | ||
1502 | /* Ignore the PDU if we've already done 20 rounds (0 - 19) */ | |
1503 | if (smp->passkey_round >= 20) | |
1504 | return 0; | |
1505 | ||
1506 | switch (smp_op) { | |
1507 | case SMP_CMD_PAIRING_RANDOM: | |
1508 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1509 | r |= 0x80; | |
1510 | ||
1511 | if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1512 | smp->rrnd, r, cfm)) | |
1513 | return SMP_UNSPECIFIED; | |
1514 | ||
329d8230 | 1515 | if (crypto_memneq(smp->pcnf, cfm, 16)) |
38606f14 JH |
1516 | return SMP_CONFIRM_FAILED; |
1517 | ||
1518 | smp->passkey_round++; | |
1519 | ||
1520 | if (smp->passkey_round == 20) { | |
1521 | /* Generate MacKey and LTK */ | |
1522 | if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk)) | |
1523 | return SMP_UNSPECIFIED; | |
1524 | } | |
1525 | ||
1526 | /* The round is only complete when the initiator | |
1527 | * receives pairing random. | |
1528 | */ | |
1529 | if (!hcon->out) { | |
1530 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1531 | sizeof(smp->prnd), smp->prnd); | |
d3e54a87 | 1532 | if (smp->passkey_round == 20) |
38606f14 | 1533 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
d3e54a87 | 1534 | else |
38606f14 | 1535 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
38606f14 JH |
1536 | return 0; |
1537 | } | |
1538 | ||
1539 | /* Start the next round */ | |
1540 | if (smp->passkey_round != 20) | |
1541 | return sc_passkey_round(smp, 0); | |
1542 | ||
1543 | /* Passkey rounds are complete - start DHKey Check */ | |
1544 | sc_dhkey_check(smp); | |
1545 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1546 | ||
1547 | break; | |
1548 | ||
1549 | case SMP_CMD_PAIRING_CONFIRM: | |
1550 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
1551 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1556 | ||
1557 | if (hcon->out) { | |
1558 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1559 | sizeof(smp->prnd), smp->prnd); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | return sc_passkey_send_confirm(smp); | |
1564 | ||
1565 | case SMP_CMD_PUBLIC_KEY: | |
1566 | default: | |
1567 | /* Initiating device starts the round */ | |
1568 | if (!hcon->out) | |
1569 | return 0; | |
1570 | ||
2e1614f7 LAD |
1571 | bt_dev_dbg(hdev, "Starting passkey round %u", |
1572 | smp->passkey_round + 1); | |
38606f14 JH |
1573 | |
1574 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1575 | ||
1576 | return sc_passkey_send_confirm(smp); | |
1577 | } | |
1578 | ||
1579 | return 0; | |
1580 | } | |
1581 | ||
dddd3059 JH |
1582 | static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey) |
1583 | { | |
38606f14 JH |
1584 | struct l2cap_conn *conn = smp->conn; |
1585 | struct hci_conn *hcon = conn->hcon; | |
1586 | u8 smp_op; | |
1587 | ||
1588 | clear_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
1589 | ||
dddd3059 JH |
1590 | switch (mgmt_op) { |
1591 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1592 | smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED); | |
1593 | return 0; | |
1594 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
1595 | smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED); | |
1596 | return 0; | |
38606f14 JH |
1597 | case MGMT_OP_USER_PASSKEY_REPLY: |
1598 | hcon->passkey_notify = le32_to_cpu(passkey); | |
1599 | smp->passkey_round = 0; | |
1600 | ||
1601 | if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) | |
1602 | smp_op = SMP_CMD_PAIRING_CONFIRM; | |
1603 | else | |
1604 | smp_op = 0; | |
1605 | ||
1606 | if (sc_passkey_round(smp, smp_op)) | |
1607 | return -EIO; | |
1608 | ||
1609 | return 0; | |
dddd3059 JH |
1610 | } |
1611 | ||
d3e54a87 JH |
1612 | /* Initiator sends DHKey check first */ |
1613 | if (hcon->out) { | |
1614 | sc_dhkey_check(smp); | |
1615 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1616 | } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) { | |
1617 | sc_dhkey_check(smp); | |
1618 | sc_add_ltk(smp); | |
1619 | } | |
760b018b JH |
1620 | |
1621 | return 0; | |
1622 | } | |
1623 | ||
2b64d153 BG |
1624 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
1625 | { | |
b10e8017 | 1626 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 1627 | struct l2cap_chan *chan; |
2b64d153 BG |
1628 | struct smp_chan *smp; |
1629 | u32 value; | |
fc75cc86 | 1630 | int err; |
2b64d153 | 1631 | |
fc75cc86 | 1632 | if (!conn) |
2b64d153 BG |
1633 | return -ENOTCONN; |
1634 | ||
0ae8ef67 LAD |
1635 | bt_dev_dbg(conn->hcon->hdev, ""); |
1636 | ||
5d88cc73 JH |
1637 | chan = conn->smp; |
1638 | if (!chan) | |
1639 | return -ENOTCONN; | |
1640 | ||
fc75cc86 JH |
1641 | l2cap_chan_lock(chan); |
1642 | if (!chan->data) { | |
1643 | err = -ENOTCONN; | |
1644 | goto unlock; | |
1645 | } | |
1646 | ||
5d88cc73 | 1647 | smp = chan->data; |
2b64d153 | 1648 | |
760b018b JH |
1649 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1650 | err = sc_user_reply(smp, mgmt_op, passkey); | |
1651 | goto unlock; | |
1652 | } | |
1653 | ||
2b64d153 BG |
1654 | switch (mgmt_op) { |
1655 | case MGMT_OP_USER_PASSKEY_REPLY: | |
1656 | value = le32_to_cpu(passkey); | |
943a732a | 1657 | memset(smp->tk, 0, sizeof(smp->tk)); |
83b4b195 | 1658 | bt_dev_dbg(conn->hcon->hdev, "PassKey: %u", value); |
943a732a | 1659 | put_unaligned_le32(value, smp->tk); |
19186c7b | 1660 | fallthrough; |
2b64d153 | 1661 | case MGMT_OP_USER_CONFIRM_REPLY: |
4a74d658 | 1662 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
1663 | break; |
1664 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1665 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 1666 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1667 | err = 0; |
1668 | goto unlock; | |
2b64d153 | 1669 | default: |
84794e11 | 1670 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1671 | err = -EOPNOTSUPP; |
1672 | goto unlock; | |
2b64d153 BG |
1673 | } |
1674 | ||
fc75cc86 JH |
1675 | err = 0; |
1676 | ||
2b64d153 | 1677 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
1678 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
1679 | u8 rsp = smp_confirm(smp); | |
1680 | if (rsp) | |
1681 | smp_failure(conn, rsp); | |
1682 | } | |
2b64d153 | 1683 | |
fc75cc86 JH |
1684 | unlock: |
1685 | l2cap_chan_unlock(chan); | |
1686 | return err; | |
2b64d153 BG |
1687 | } |
1688 | ||
b5ae344d JH |
1689 | static void build_bredr_pairing_cmd(struct smp_chan *smp, |
1690 | struct smp_cmd_pairing *req, | |
1691 | struct smp_cmd_pairing *rsp) | |
1692 | { | |
1693 | struct l2cap_conn *conn = smp->conn; | |
1694 | struct hci_dev *hdev = conn->hcon->hdev; | |
1695 | u8 local_dist = 0, remote_dist = 0; | |
1696 | ||
d7a5a11d | 1697 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
b5ae344d JH |
1698 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
1699 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1700 | } | |
1701 | ||
d7a5a11d | 1702 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
b5ae344d JH |
1703 | remote_dist |= SMP_DIST_ID_KEY; |
1704 | ||
d7a5a11d | 1705 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
b5ae344d JH |
1706 | local_dist |= SMP_DIST_ID_KEY; |
1707 | ||
1708 | if (!rsp) { | |
1709 | memset(req, 0, sizeof(*req)); | |
1710 | ||
a62da6f1 | 1711 | req->auth_req = SMP_AUTH_CT2; |
b5ae344d JH |
1712 | req->init_key_dist = local_dist; |
1713 | req->resp_key_dist = remote_dist; | |
e3f6a257 | 1714 | req->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1715 | |
1716 | smp->remote_key_dist = remote_dist; | |
1717 | ||
1718 | return; | |
1719 | } | |
1720 | ||
1721 | memset(rsp, 0, sizeof(*rsp)); | |
1722 | ||
a62da6f1 | 1723 | rsp->auth_req = SMP_AUTH_CT2; |
e3f6a257 | 1724 | rsp->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1725 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
1726 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
1727 | ||
1728 | smp->remote_key_dist = rsp->init_key_dist; | |
1729 | } | |
1730 | ||
da85e5e5 | 1731 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1732 | { |
3158c50c | 1733 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 1734 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 1735 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 1736 | struct smp_chan *smp; |
c7262e71 | 1737 | u8 key_size, auth, sec_level; |
8aab4757 | 1738 | int ret; |
88ba43b6 | 1739 | |
2e1614f7 | 1740 | bt_dev_dbg(hdev, "conn %p", conn); |
88ba43b6 | 1741 | |
c46b98be | 1742 | if (skb->len < sizeof(*req)) |
38e4a915 | 1743 | return SMP_INVALID_PARAMS; |
c46b98be | 1744 | |
40bef302 | 1745 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
1746 | return SMP_CMD_NOTSUPP; |
1747 | ||
fc75cc86 | 1748 | if (!chan->data) |
8aab4757 | 1749 | smp = smp_chan_create(conn); |
fc75cc86 | 1750 | else |
5d88cc73 | 1751 | smp = chan->data; |
8aab4757 | 1752 | |
d08fd0e7 AE |
1753 | if (!smp) |
1754 | return SMP_UNSPECIFIED; | |
d26a2345 | 1755 | |
c05b9339 | 1756 | /* We didn't start the pairing, so match remote */ |
0edb14de | 1757 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1758 | |
d7a5a11d | 1759 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 1760 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
1761 | return SMP_PAIRING_NOTSUPP; |
1762 | ||
d7a5a11d | 1763 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1764 | return SMP_AUTH_REQUIREMENTS; |
1765 | ||
1c1def09 VCG |
1766 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1767 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 1768 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 1769 | |
cb06d366 JH |
1770 | /* If the remote side's OOB flag is set it means it has |
1771 | * successfully received our local OOB data - therefore set the | |
1772 | * flag to indicate that local OOB is in use. | |
1773 | */ | |
94f14e47 | 1774 | if (req->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob) |
58428563 JH |
1775 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); |
1776 | ||
b5ae344d JH |
1777 | /* SMP over BR/EDR requires special treatment */ |
1778 | if (conn->hcon->type == ACL_LINK) { | |
1779 | /* We must have a BR/EDR SC link */ | |
08f63cc5 | 1780 | if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) && |
b7cb93e5 | 1781 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
1782 | return SMP_CROSS_TRANSP_NOT_ALLOWED; |
1783 | ||
1784 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1785 | ||
1786 | build_bredr_pairing_cmd(smp, req, &rsp); | |
1787 | ||
a62da6f1 JH |
1788 | if (req->auth_req & SMP_AUTH_CT2) |
1789 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1790 | ||
b5ae344d JH |
1791 | key_size = min(req->max_key_size, rsp.max_key_size); |
1792 | if (check_enc_key_size(conn, key_size)) | |
1793 | return SMP_ENC_KEY_SIZE; | |
1794 | ||
1795 | /* Clear bits which are generated but not distributed */ | |
1796 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1797 | ||
1798 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; | |
1799 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
1800 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); | |
1801 | ||
1802 | smp_distribute_keys(smp); | |
1803 | return 0; | |
1804 | } | |
1805 | ||
5e3d3d9b JH |
1806 | build_pairing_cmd(conn, req, &rsp, auth); |
1807 | ||
a62da6f1 | 1808 | if (rsp.auth_req & SMP_AUTH_SC) { |
5e3d3d9b JH |
1809 | set_bit(SMP_FLAG_SC, &smp->flags); |
1810 | ||
a62da6f1 JH |
1811 | if (rsp.auth_req & SMP_AUTH_CT2) |
1812 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1813 | } | |
1814 | ||
5be5e275 | 1815 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1816 | sec_level = BT_SECURITY_MEDIUM; |
1817 | else | |
1818 | sec_level = authreq_to_seclevel(auth); | |
1819 | ||
c7262e71 JH |
1820 | if (sec_level > conn->hcon->pending_sec_level) |
1821 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1822 | |
49c922bb | 1823 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1824 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1825 | u8 method; | |
1826 | ||
1827 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1828 | req->io_capability); | |
1829 | if (method == JUST_WORKS || method == JUST_CFM) | |
1830 | return SMP_AUTH_REQUIREMENTS; | |
1831 | } | |
1832 | ||
3158c50c VCG |
1833 | key_size = min(req->max_key_size, rsp.max_key_size); |
1834 | if (check_enc_key_size(conn, key_size)) | |
1835 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1836 | |
e84a6b13 | 1837 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1838 | |
1c1def09 VCG |
1839 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1840 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1841 | |
3158c50c | 1842 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1843 | |
1844 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1845 | ||
19c5ce9c JH |
1846 | /* Strictly speaking we shouldn't allow Pairing Confirm for the |
1847 | * SC case, however some implementations incorrectly copy RFU auth | |
1848 | * req bits from our security request, which may create a false | |
1849 | * positive SC enablement. | |
1850 | */ | |
1851 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1852 | ||
3b19146d JH |
1853 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1854 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1855 | /* Clear bits which are generated but not distributed */ | |
1856 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1857 | /* Wait for Public Key from Initiating Device */ | |
1858 | return 0; | |
3b19146d | 1859 | } |
da85e5e5 | 1860 | |
2b64d153 BG |
1861 | /* Request setup of TK */ |
1862 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1863 | if (ret) | |
1864 | return SMP_UNSPECIFIED; | |
1865 | ||
da85e5e5 | 1866 | return 0; |
88ba43b6 AB |
1867 | } |
1868 | ||
3b19146d JH |
1869 | static u8 sc_send_public_key(struct smp_chan *smp) |
1870 | { | |
70157ef5 JH |
1871 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
1872 | ||
56860245 | 1873 | bt_dev_dbg(hdev, ""); |
3b19146d | 1874 | |
1a8bab4f | 1875 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { |
33d0c030 MH |
1876 | struct l2cap_chan *chan = hdev->smp_data; |
1877 | struct smp_dev *smp_dev; | |
1878 | ||
1879 | if (!chan || !chan->data) | |
1880 | return SMP_UNSPECIFIED; | |
1881 | ||
1882 | smp_dev = chan->data; | |
1883 | ||
1884 | memcpy(smp->local_pk, smp_dev->local_pk, 64); | |
fb334fee | 1885 | memcpy(smp->lr, smp_dev->local_rand, 16); |
33d0c030 MH |
1886 | |
1887 | if (smp_dev->debug_key) | |
1888 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1889 | ||
1890 | goto done; | |
1891 | } | |
1892 | ||
d7a5a11d | 1893 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { |
2e1614f7 | 1894 | bt_dev_dbg(hdev, "Using debug keys"); |
c0153b0b TA |
1895 | if (set_ecdh_privkey(smp->tfm_ecdh, debug_sk)) |
1896 | return SMP_UNSPECIFIED; | |
70157ef5 | 1897 | memcpy(smp->local_pk, debug_pk, 64); |
70157ef5 JH |
1898 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); |
1899 | } else { | |
1900 | while (true) { | |
c0153b0b TA |
1901 | /* Generate key pair for Secure Connections */ |
1902 | if (generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk)) | |
70157ef5 | 1903 | return SMP_UNSPECIFIED; |
6c0dcc50 | 1904 | |
70157ef5 | 1905 | /* This is unlikely, but we need to check that |
91641b79 | 1906 | * we didn't accidentally generate a debug key. |
70157ef5 | 1907 | */ |
c0153b0b | 1908 | if (crypto_memneq(smp->local_pk, debug_pk, 64)) |
70157ef5 JH |
1909 | break; |
1910 | } | |
6c0dcc50 | 1911 | } |
3b19146d | 1912 | |
33d0c030 | 1913 | done: |
c7a3d57d | 1914 | SMP_DBG("Local Public Key X: %32phN", smp->local_pk); |
8e4e2ee5 | 1915 | SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32); |
3b19146d JH |
1916 | |
1917 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1918 | ||
1919 | return 0; | |
1920 | } | |
1921 | ||
da85e5e5 | 1922 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1923 | { |
3158c50c | 1924 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1925 | struct l2cap_chan *chan = conn->smp; |
1926 | struct smp_chan *smp = chan->data; | |
0edb14de | 1927 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1928 | u8 key_size, auth; |
7d24ddcc | 1929 | int ret; |
88ba43b6 | 1930 | |
2e1614f7 | 1931 | bt_dev_dbg(hdev, "conn %p", conn); |
88ba43b6 | 1932 | |
c46b98be | 1933 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1934 | return SMP_INVALID_PARAMS; |
c46b98be | 1935 | |
40bef302 | 1936 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1937 | return SMP_CMD_NOTSUPP; |
1938 | ||
3158c50c VCG |
1939 | skb_pull(skb, sizeof(*rsp)); |
1940 | ||
1c1def09 | 1941 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1942 | |
3158c50c VCG |
1943 | key_size = min(req->max_key_size, rsp->max_key_size); |
1944 | if (check_enc_key_size(conn, key_size)) | |
1945 | return SMP_ENC_KEY_SIZE; | |
1946 | ||
0edb14de | 1947 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1948 | |
d7a5a11d | 1949 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1950 | return SMP_AUTH_REQUIREMENTS; |
1951 | ||
cb06d366 JH |
1952 | /* If the remote side's OOB flag is set it means it has |
1953 | * successfully received our local OOB data - therefore set the | |
1954 | * flag to indicate that local OOB is in use. | |
1955 | */ | |
94f14e47 | 1956 | if (rsp->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob) |
58428563 JH |
1957 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); |
1958 | ||
b5ae344d JH |
1959 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1960 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
1961 | ||
1962 | /* Update remote key distribution in case the remote cleared | |
1963 | * some bits that we had enabled in our request. | |
1964 | */ | |
1965 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1966 | ||
a62da6f1 JH |
1967 | if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2)) |
1968 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1969 | ||
b5ae344d JH |
1970 | /* For BR/EDR this means we're done and can start phase 3 */ |
1971 | if (conn->hcon->type == ACL_LINK) { | |
1972 | /* Clear bits which are generated but not distributed */ | |
1973 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1974 | smp_distribute_keys(smp); | |
1975 | return 0; | |
1976 | } | |
1977 | ||
65668776 JH |
1978 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1979 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1980 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1981 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1982 | |
49c922bb | 1983 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1984 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1985 | u8 method; | |
1986 | ||
1987 | method = get_auth_method(smp, req->io_capability, | |
1988 | rsp->io_capability); | |
1989 | if (method == JUST_WORKS || method == JUST_CFM) | |
1990 | return SMP_AUTH_REQUIREMENTS; | |
1991 | } | |
1992 | ||
e84a6b13 | 1993 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1994 | |
fdcc4bec JH |
1995 | /* Update remote key distribution in case the remote cleared |
1996 | * some bits that we had enabled in our request. | |
1997 | */ | |
1998 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1999 | ||
3b19146d JH |
2000 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2001 | /* Clear bits which are generated but not distributed */ | |
2002 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
2003 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
2004 | return sc_send_public_key(smp); | |
2005 | } | |
2006 | ||
c05b9339 | 2007 | auth |= req->auth_req; |
2b64d153 | 2008 | |
476585ec | 2009 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
2010 | if (ret) |
2011 | return SMP_UNSPECIFIED; | |
2012 | ||
4a74d658 | 2013 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
2014 | |
2015 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 2016 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 2017 | return smp_confirm(smp); |
da85e5e5 VCG |
2018 | |
2019 | return 0; | |
88ba43b6 AB |
2020 | } |
2021 | ||
dcee2b32 JH |
2022 | static u8 sc_check_confirm(struct smp_chan *smp) |
2023 | { | |
2024 | struct l2cap_conn *conn = smp->conn; | |
2025 | ||
2e1614f7 | 2026 | bt_dev_dbg(conn->hcon->hdev, ""); |
dcee2b32 | 2027 | |
38606f14 JH |
2028 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2029 | return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM); | |
2030 | ||
dcee2b32 JH |
2031 | if (conn->hcon->out) { |
2032 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2033 | smp->prnd); | |
2034 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2035 | } | |
2036 | ||
2037 | return 0; | |
2038 | } | |
2039 | ||
19c5ce9c JH |
2040 | /* Work-around for some implementations that incorrectly copy RFU bits |
2041 | * from our security request and thereby create the impression that | |
2042 | * we're doing SC when in fact the remote doesn't support it. | |
2043 | */ | |
2044 | static int fixup_sc_false_positive(struct smp_chan *smp) | |
2045 | { | |
2046 | struct l2cap_conn *conn = smp->conn; | |
2047 | struct hci_conn *hcon = conn->hcon; | |
2048 | struct hci_dev *hdev = hcon->hdev; | |
2049 | struct smp_cmd_pairing *req, *rsp; | |
2050 | u8 auth; | |
2051 | ||
fad646e1 | 2052 | /* The issue is only observed when we're in responder role */ |
19c5ce9c JH |
2053 | if (hcon->out) |
2054 | return SMP_UNSPECIFIED; | |
2055 | ||
2056 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) { | |
2064ee33 | 2057 | bt_dev_err(hdev, "refusing legacy fallback in SC-only mode"); |
19c5ce9c JH |
2058 | return SMP_UNSPECIFIED; |
2059 | } | |
2060 | ||
2064ee33 | 2061 | bt_dev_err(hdev, "trying to fall back to legacy SMP"); |
19c5ce9c JH |
2062 | |
2063 | req = (void *) &smp->preq[1]; | |
2064 | rsp = (void *) &smp->prsp[1]; | |
2065 | ||
2066 | /* Rebuild key dist flags which may have been cleared for SC */ | |
2067 | smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist); | |
2068 | ||
2069 | auth = req->auth_req & AUTH_REQ_MASK(hdev); | |
2070 | ||
2071 | if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) { | |
2064ee33 | 2072 | bt_dev_err(hdev, "failed to fall back to legacy SMP"); |
19c5ce9c JH |
2073 | return SMP_UNSPECIFIED; |
2074 | } | |
2075 | ||
2076 | clear_bit(SMP_FLAG_SC, &smp->flags); | |
2077 | ||
2078 | return 0; | |
2079 | } | |
2080 | ||
da85e5e5 | 2081 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2082 | { |
5d88cc73 JH |
2083 | struct l2cap_chan *chan = conn->smp; |
2084 | struct smp_chan *smp = chan->data; | |
2e1614f7 LAD |
2085 | struct hci_conn *hcon = conn->hcon; |
2086 | struct hci_dev *hdev = hcon->hdev; | |
7d24ddcc | 2087 | |
fad646e1 AP |
2088 | bt_dev_dbg(hdev, "conn %p %s", conn, |
2089 | hcon->out ? "initiator" : "responder"); | |
88ba43b6 | 2090 | |
c46b98be | 2091 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 2092 | return SMP_INVALID_PARAMS; |
c46b98be | 2093 | |
1c1def09 VCG |
2094 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
2095 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 2096 | |
19c5ce9c JH |
2097 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2098 | int ret; | |
2099 | ||
2100 | /* Public Key exchange must happen before any other steps */ | |
2101 | if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags)) | |
2102 | return sc_check_confirm(smp); | |
2103 | ||
2e1614f7 | 2104 | bt_dev_err(hdev, "Unexpected SMP Pairing Confirm"); |
19c5ce9c JH |
2105 | |
2106 | ret = fixup_sc_false_positive(smp); | |
2107 | if (ret) | |
2108 | return ret; | |
2109 | } | |
dcee2b32 | 2110 | |
b28b4943 | 2111 | if (conn->hcon->out) { |
943a732a JH |
2112 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
2113 | smp->prnd); | |
b28b4943 JH |
2114 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
2115 | return 0; | |
2116 | } | |
2117 | ||
2118 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 2119 | return smp_confirm(smp); |
983f9814 MH |
2120 | |
2121 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
da85e5e5 VCG |
2122 | |
2123 | return 0; | |
88ba43b6 AB |
2124 | } |
2125 | ||
da85e5e5 | 2126 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2127 | { |
5d88cc73 JH |
2128 | struct l2cap_chan *chan = conn->smp; |
2129 | struct smp_chan *smp = chan->data; | |
191dc7fe | 2130 | struct hci_conn *hcon = conn->hcon; |
eed467b5 | 2131 | u8 *pkax, *pkbx, *na, *nb, confirm_hint; |
191dc7fe JH |
2132 | u32 passkey; |
2133 | int err; | |
7d24ddcc | 2134 | |
2e1614f7 | 2135 | bt_dev_dbg(hcon->hdev, "conn %p", conn); |
3158c50c | 2136 | |
c46b98be | 2137 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 2138 | return SMP_INVALID_PARAMS; |
c46b98be | 2139 | |
943a732a | 2140 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 2141 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 2142 | |
191dc7fe JH |
2143 | if (!test_bit(SMP_FLAG_SC, &smp->flags)) |
2144 | return smp_random(smp); | |
2145 | ||
580039e8 JH |
2146 | if (hcon->out) { |
2147 | pkax = smp->local_pk; | |
2148 | pkbx = smp->remote_pk; | |
2149 | na = smp->prnd; | |
2150 | nb = smp->rrnd; | |
2151 | } else { | |
2152 | pkax = smp->remote_pk; | |
2153 | pkbx = smp->local_pk; | |
2154 | na = smp->rrnd; | |
2155 | nb = smp->prnd; | |
2156 | } | |
2157 | ||
a29b0733 JH |
2158 | if (smp->method == REQ_OOB) { |
2159 | if (!hcon->out) | |
2160 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2161 | sizeof(smp->prnd), smp->prnd); | |
2162 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
2163 | goto mackey_and_ltk; | |
2164 | } | |
2165 | ||
38606f14 JH |
2166 | /* Passkey entry has special treatment */ |
2167 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
2168 | return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM); | |
2169 | ||
191dc7fe JH |
2170 | if (hcon->out) { |
2171 | u8 cfm[16]; | |
2172 | ||
2173 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
2174 | smp->rrnd, 0, cfm); | |
2175 | if (err) | |
2176 | return SMP_UNSPECIFIED; | |
2177 | ||
329d8230 | 2178 | if (crypto_memneq(smp->pcnf, cfm, 16)) |
191dc7fe | 2179 | return SMP_CONFIRM_FAILED; |
191dc7fe JH |
2180 | } else { |
2181 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2182 | smp->prnd); | |
2183 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
cee5f20f HC |
2184 | |
2185 | /* Only Just-Works pairing requires extra checks */ | |
2186 | if (smp->method != JUST_WORKS) | |
2187 | goto mackey_and_ltk; | |
2188 | ||
2189 | /* If there already exists long term key in local host, leave | |
2190 | * the decision to user space since the remote device could | |
2191 | * be legitimate or malicious. | |
2192 | */ | |
2193 | if (hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, | |
2194 | hcon->role)) { | |
eed467b5 HC |
2195 | /* Set passkey to 0. The value can be any number since |
2196 | * it'll be ignored anyway. | |
2197 | */ | |
2198 | passkey = 0; | |
2199 | confirm_hint = 1; | |
2200 | goto confirm; | |
cee5f20f | 2201 | } |
191dc7fe JH |
2202 | } |
2203 | ||
a29b0733 | 2204 | mackey_and_ltk: |
760b018b JH |
2205 | /* Generate MacKey and LTK */ |
2206 | err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk); | |
2207 | if (err) | |
2208 | return SMP_UNSPECIFIED; | |
2209 | ||
ffee202a | 2210 | if (smp->method == REQ_OOB) { |
dddd3059 | 2211 | if (hcon->out) { |
38606f14 | 2212 | sc_dhkey_check(smp); |
dddd3059 JH |
2213 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
2214 | } | |
2215 | return 0; | |
2216 | } | |
2217 | ||
38606f14 JH |
2218 | err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey); |
2219 | if (err) | |
2220 | return SMP_UNSPECIFIED; | |
2221 | ||
eed467b5 HC |
2222 | confirm_hint = 0; |
2223 | ||
2224 | confirm: | |
ffee202a SS |
2225 | if (smp->method == JUST_WORKS) |
2226 | confirm_hint = 1; | |
2227 | ||
38606f14 | 2228 | err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type, |
eed467b5 | 2229 | hcon->dst_type, passkey, confirm_hint); |
191dc7fe JH |
2230 | if (err) |
2231 | return SMP_UNSPECIFIED; | |
2232 | ||
38606f14 JH |
2233 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2234 | ||
191dc7fe | 2235 | return 0; |
88ba43b6 AB |
2236 | } |
2237 | ||
f81cd823 | 2238 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 2239 | { |
c9839a11 | 2240 | struct smp_ltk *key; |
988c5997 VCG |
2241 | struct hci_conn *hcon = conn->hcon; |
2242 | ||
f3a73d97 | 2243 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 2244 | if (!key) |
f81cd823 | 2245 | return false; |
988c5997 | 2246 | |
a6f7833c | 2247 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 2248 | return false; |
4dab7864 | 2249 | |
51a8efd7 | 2250 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 2251 | return true; |
988c5997 | 2252 | |
8b76ce34 | 2253 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size); |
c9839a11 | 2254 | hcon->enc_key_size = key->enc_size; |
988c5997 | 2255 | |
fad646e1 | 2256 | /* We never store STKs for initiator role, so clear this flag */ |
fe59a05f JH |
2257 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
2258 | ||
f81cd823 | 2259 | return true; |
988c5997 | 2260 | } |
f1560463 | 2261 | |
35dc6f83 JH |
2262 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
2263 | enum smp_key_pref key_pref) | |
854f4727 JH |
2264 | { |
2265 | if (sec_level == BT_SECURITY_LOW) | |
2266 | return true; | |
2267 | ||
35dc6f83 JH |
2268 | /* If we're encrypted with an STK but the caller prefers using |
2269 | * LTK claim insufficient security. This way we allow the | |
2270 | * connection to be re-encrypted with an LTK, even if the LTK | |
2271 | * provides the same level of security. Only exception is if we | |
2272 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 2273 | */ |
35dc6f83 JH |
2274 | if (key_pref == SMP_USE_LTK && |
2275 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 2276 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
2277 | return false; |
2278 | ||
854f4727 JH |
2279 | if (hcon->sec_level >= sec_level) |
2280 | return true; | |
2281 | ||
2282 | return false; | |
2283 | } | |
2284 | ||
da85e5e5 | 2285 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
2286 | { |
2287 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
2288 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 2289 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 2290 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 2291 | struct smp_chan *smp; |
c05b9339 | 2292 | u8 sec_level, auth; |
88ba43b6 | 2293 | |
2e1614f7 | 2294 | bt_dev_dbg(hdev, "conn %p", conn); |
88ba43b6 | 2295 | |
c46b98be | 2296 | if (skb->len < sizeof(*rp)) |
38e4a915 | 2297 | return SMP_INVALID_PARAMS; |
c46b98be | 2298 | |
40bef302 | 2299 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
2300 | return SMP_CMD_NOTSUPP; |
2301 | ||
0edb14de | 2302 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 2303 | |
d7a5a11d | 2304 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
2305 | return SMP_AUTH_REQUIREMENTS; |
2306 | ||
5be5e275 | 2307 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
2308 | sec_level = BT_SECURITY_MEDIUM; |
2309 | else | |
2310 | sec_level = authreq_to_seclevel(auth); | |
2311 | ||
64e759f5 SJ |
2312 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) { |
2313 | /* If link is already encrypted with sufficient security we | |
2314 | * still need refresh encryption as per Core Spec 5.0 Vol 3, | |
2315 | * Part H 2.4.6 | |
2316 | */ | |
2317 | smp_ltk_encrypt(conn, hcon->sec_level); | |
854f4727 | 2318 | return 0; |
64e759f5 | 2319 | } |
854f4727 | 2320 | |
c7262e71 JH |
2321 | if (sec_level > hcon->pending_sec_level) |
2322 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 2323 | |
4dab7864 | 2324 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
2325 | return 0; |
2326 | ||
8aab4757 | 2327 | smp = smp_chan_create(conn); |
c29d2444 JH |
2328 | if (!smp) |
2329 | return SMP_UNSPECIFIED; | |
d26a2345 | 2330 | |
d7a5a11d | 2331 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 2332 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
2333 | return SMP_PAIRING_NOTSUPP; |
2334 | ||
88ba43b6 | 2335 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 2336 | |
da85e5e5 | 2337 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 2338 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 2339 | |
1c1def09 VCG |
2340 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2341 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2342 | |
88ba43b6 | 2343 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2344 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 2345 | |
da85e5e5 | 2346 | return 0; |
88ba43b6 AB |
2347 | } |
2348 | ||
cc110922 | 2349 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 2350 | { |
cc110922 | 2351 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 2352 | struct l2cap_chan *chan; |
0a66cf20 | 2353 | struct smp_chan *smp; |
2b64d153 | 2354 | __u8 authreq; |
fc75cc86 | 2355 | int ret; |
eb492e01 | 2356 | |
2e1614f7 LAD |
2357 | bt_dev_dbg(hcon->hdev, "conn %p hcon %p level 0x%2.2x", conn, hcon, |
2358 | sec_level); | |
3a0259bb | 2359 | |
0a66cf20 JH |
2360 | /* This may be NULL if there's an unexpected disconnection */ |
2361 | if (!conn) | |
2362 | return 1; | |
2363 | ||
d7a5a11d | 2364 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) |
2e65c9d2 AG |
2365 | return 1; |
2366 | ||
35dc6f83 | 2367 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 2368 | return 1; |
f1cb9af5 | 2369 | |
c7262e71 JH |
2370 | if (sec_level > hcon->pending_sec_level) |
2371 | hcon->pending_sec_level = sec_level; | |
2372 | ||
40bef302 | 2373 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
2374 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
2375 | return 0; | |
d26a2345 | 2376 | |
d8949aad JH |
2377 | chan = conn->smp; |
2378 | if (!chan) { | |
2064ee33 | 2379 | bt_dev_err(hcon->hdev, "security requested but not available"); |
d8949aad JH |
2380 | return 1; |
2381 | } | |
2382 | ||
fc75cc86 JH |
2383 | l2cap_chan_lock(chan); |
2384 | ||
2385 | /* If SMP is already in progress ignore this request */ | |
2386 | if (chan->data) { | |
2387 | ret = 0; | |
2388 | goto unlock; | |
2389 | } | |
d26a2345 | 2390 | |
8aab4757 | 2391 | smp = smp_chan_create(conn); |
fc75cc86 JH |
2392 | if (!smp) { |
2393 | ret = 1; | |
2394 | goto unlock; | |
2395 | } | |
2b64d153 BG |
2396 | |
2397 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 2398 | |
a62da6f1 | 2399 | if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) { |
d2eb9e10 | 2400 | authreq |= SMP_AUTH_SC; |
a62da6f1 JH |
2401 | if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED)) |
2402 | authreq |= SMP_AUTH_CT2; | |
2403 | } | |
d2eb9e10 | 2404 | |
c2aa30db AP |
2405 | /* Don't attempt to set MITM if setting is overridden by debugfs |
2406 | * Needed to pass certification test SM/MAS/PKE/BV-01-C | |
2e233644 | 2407 | */ |
c2aa30db AP |
2408 | if (!hci_dev_test_flag(hcon->hdev, HCI_FORCE_NO_MITM)) { |
2409 | /* Require MITM if IO Capability allows or the security level | |
2410 | * requires it. | |
2411 | */ | |
2412 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || | |
2413 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) | |
2414 | authreq |= SMP_AUTH_MITM; | |
2415 | } | |
2e233644 | 2416 | |
40bef302 | 2417 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 2418 | struct smp_cmd_pairing cp; |
f01ead31 | 2419 | |
2b64d153 | 2420 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
2421 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2422 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2423 | |
eb492e01 | 2424 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2425 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
2426 | } else { |
2427 | struct smp_cmd_security_req cp; | |
2b64d153 | 2428 | cp.auth_req = authreq; |
eb492e01 | 2429 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 2430 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
2431 | } |
2432 | ||
4a74d658 | 2433 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 2434 | ret = 0; |
edca792c | 2435 | |
fc75cc86 JH |
2436 | unlock: |
2437 | l2cap_chan_unlock(chan); | |
2438 | return ret; | |
eb492e01 AB |
2439 | } |
2440 | ||
cb28c306 MK |
2441 | int smp_cancel_and_remove_pairing(struct hci_dev *hdev, bdaddr_t *bdaddr, |
2442 | u8 addr_type) | |
c81d555a | 2443 | { |
cb28c306 MK |
2444 | struct hci_conn *hcon; |
2445 | struct l2cap_conn *conn; | |
c81d555a JH |
2446 | struct l2cap_chan *chan; |
2447 | struct smp_chan *smp; | |
cb28c306 MK |
2448 | int err; |
2449 | ||
2450 | err = hci_remove_ltk(hdev, bdaddr, addr_type); | |
2451 | hci_remove_irk(hdev, bdaddr, addr_type); | |
2452 | ||
2453 | hcon = hci_conn_hash_lookup_le(hdev, bdaddr, addr_type); | |
2454 | if (!hcon) | |
2455 | goto done; | |
c81d555a | 2456 | |
cb28c306 | 2457 | conn = hcon->l2cap_data; |
c81d555a | 2458 | if (!conn) |
cb28c306 | 2459 | goto done; |
c81d555a JH |
2460 | |
2461 | chan = conn->smp; | |
2462 | if (!chan) | |
cb28c306 | 2463 | goto done; |
c81d555a JH |
2464 | |
2465 | l2cap_chan_lock(chan); | |
2466 | ||
2467 | smp = chan->data; | |
2468 | if (smp) { | |
cb28c306 MK |
2469 | /* Set keys to NULL to make sure smp_failure() does not try to |
2470 | * remove and free already invalidated rcu list entries. */ | |
2471 | smp->ltk = NULL; | |
fad646e1 | 2472 | smp->responder_ltk = NULL; |
cb28c306 MK |
2473 | smp->remote_irk = NULL; |
2474 | ||
c81d555a JH |
2475 | if (test_bit(SMP_FLAG_COMPLETE, &smp->flags)) |
2476 | smp_failure(conn, 0); | |
2477 | else | |
2478 | smp_failure(conn, SMP_UNSPECIFIED); | |
cb28c306 | 2479 | err = 0; |
c81d555a JH |
2480 | } |
2481 | ||
2482 | l2cap_chan_unlock(chan); | |
cb28c306 MK |
2483 | |
2484 | done: | |
2485 | return err; | |
c81d555a JH |
2486 | } |
2487 | ||
7034b911 VCG |
2488 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2489 | { | |
16b90839 | 2490 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
2491 | struct l2cap_chan *chan = conn->smp; |
2492 | struct smp_chan *smp = chan->data; | |
16b90839 | 2493 | |
2e1614f7 | 2494 | bt_dev_dbg(conn->hcon->hdev, "conn %p", conn); |
c46b98be JH |
2495 | |
2496 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2497 | return SMP_INVALID_PARAMS; |
c46b98be | 2498 | |
600a8749 AM |
2499 | /* Pairing is aborted if any blocked keys are distributed */ |
2500 | if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_LTK, | |
2501 | rp->ltk)) { | |
2502 | bt_dev_warn_ratelimited(conn->hcon->hdev, | |
2503 | "LTK blocked for %pMR", | |
2504 | &conn->hcon->dst); | |
2505 | return SMP_INVALID_PARAMS; | |
2506 | } | |
2507 | ||
fad646e1 | 2508 | SMP_ALLOW_CMD(smp, SMP_CMD_INITIATOR_IDENT); |
6131ddc8 | 2509 | |
16b90839 VCG |
2510 | skb_pull(skb, sizeof(*rp)); |
2511 | ||
1c1def09 | 2512 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 2513 | |
7034b911 VCG |
2514 | return 0; |
2515 | } | |
2516 | ||
fad646e1 | 2517 | static int smp_cmd_initiator_ident(struct l2cap_conn *conn, struct sk_buff *skb) |
7034b911 | 2518 | { |
fad646e1 | 2519 | struct smp_cmd_initiator_ident *rp = (void *)skb->data; |
5d88cc73 JH |
2520 | struct l2cap_chan *chan = conn->smp; |
2521 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
2522 | struct hci_dev *hdev = conn->hcon->hdev; |
2523 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 2524 | struct smp_ltk *ltk; |
c9839a11 | 2525 | u8 authenticated; |
16b90839 | 2526 | |
2e1614f7 | 2527 | bt_dev_dbg(hdev, "conn %p", conn); |
c46b98be JH |
2528 | |
2529 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2530 | return SMP_INVALID_PARAMS; |
c46b98be | 2531 | |
9747a9f3 JH |
2532 | /* Mark the information as received */ |
2533 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
2534 | ||
b28b4943 JH |
2535 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
2536 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
2537 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
2538 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 2539 | |
16b90839 | 2540 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 2541 | |
ce39fb4e | 2542 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 2543 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
2544 | authenticated, smp->tk, smp->enc_key_size, |
2545 | rp->ediv, rp->rand); | |
2546 | smp->ltk = ltk; | |
c6e81e9a | 2547 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 2548 | smp_distribute_keys(smp); |
7034b911 VCG |
2549 | |
2550 | return 0; | |
2551 | } | |
2552 | ||
fd349c02 JH |
2553 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2554 | { | |
2555 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
2556 | struct l2cap_chan *chan = conn->smp; |
2557 | struct smp_chan *smp = chan->data; | |
fd349c02 | 2558 | |
2e1614f7 | 2559 | bt_dev_dbg(conn->hcon->hdev, ""); |
fd349c02 JH |
2560 | |
2561 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2562 | return SMP_INVALID_PARAMS; |
fd349c02 | 2563 | |
600a8749 AM |
2564 | /* Pairing is aborted if any blocked keys are distributed */ |
2565 | if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_IRK, | |
2566 | info->irk)) { | |
2567 | bt_dev_warn_ratelimited(conn->hcon->hdev, | |
2568 | "Identity key blocked for %pMR", | |
2569 | &conn->hcon->dst); | |
2570 | return SMP_INVALID_PARAMS; | |
2571 | } | |
2572 | ||
b28b4943 | 2573 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 2574 | |
fd349c02 JH |
2575 | skb_pull(skb, sizeof(*info)); |
2576 | ||
2577 | memcpy(smp->irk, info->irk, 16); | |
2578 | ||
2579 | return 0; | |
2580 | } | |
2581 | ||
2582 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
2583 | struct sk_buff *skb) | |
2584 | { | |
2585 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
2586 | struct l2cap_chan *chan = conn->smp; |
2587 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2588 | struct hci_conn *hcon = conn->hcon; |
2589 | bdaddr_t rpa; | |
2590 | ||
2e1614f7 | 2591 | bt_dev_dbg(hcon->hdev, ""); |
fd349c02 JH |
2592 | |
2593 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2594 | return SMP_INVALID_PARAMS; |
fd349c02 | 2595 | |
9747a9f3 JH |
2596 | /* Mark the information as received */ |
2597 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
2598 | ||
b28b4943 JH |
2599 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
2600 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
2601 | ||
fd349c02 JH |
2602 | skb_pull(skb, sizeof(*info)); |
2603 | ||
a9a58f86 JH |
2604 | /* Strictly speaking the Core Specification (4.1) allows sending |
2605 | * an empty address which would force us to rely on just the IRK | |
2606 | * as "identity information". However, since such | |
2607 | * implementations are not known of and in order to not over | |
2608 | * complicate our implementation, simply pretend that we never | |
2609 | * received an IRK for such a device. | |
e12af489 JH |
2610 | * |
2611 | * The Identity Address must also be a Static Random or Public | |
2612 | * Address, which hci_is_identity_address() checks for. | |
a9a58f86 | 2613 | */ |
e12af489 JH |
2614 | if (!bacmp(&info->bdaddr, BDADDR_ANY) || |
2615 | !hci_is_identity_address(&info->bdaddr, info->addr_type)) { | |
2064ee33 | 2616 | bt_dev_err(hcon->hdev, "ignoring IRK with no identity address"); |
31dd624e | 2617 | goto distribute; |
a9a58f86 JH |
2618 | } |
2619 | ||
1d87b88b SJ |
2620 | /* Drop IRK if peer is using identity address during pairing but is |
2621 | * providing different address as identity information. | |
2622 | * | |
2623 | * Microsoft Surface Precision Mouse is known to have this bug. | |
2624 | */ | |
2625 | if (hci_is_identity_address(&hcon->dst, hcon->dst_type) && | |
2626 | (bacmp(&info->bdaddr, &hcon->dst) || | |
2627 | info->addr_type != hcon->dst_type)) { | |
2628 | bt_dev_err(hcon->hdev, | |
2629 | "ignoring IRK with invalid identity address"); | |
2630 | goto distribute; | |
2631 | } | |
2632 | ||
fd349c02 JH |
2633 | bacpy(&smp->id_addr, &info->bdaddr); |
2634 | smp->id_addr_type = info->addr_type; | |
2635 | ||
2636 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
2637 | bacpy(&rpa, &hcon->dst); | |
2638 | else | |
2639 | bacpy(&rpa, BDADDR_ANY); | |
2640 | ||
23d0e128 JH |
2641 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
2642 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 2643 | |
31dd624e | 2644 | distribute: |
c6e81e9a JH |
2645 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
2646 | smp_distribute_keys(smp); | |
fd349c02 JH |
2647 | |
2648 | return 0; | |
2649 | } | |
2650 | ||
7ee4ea36 MH |
2651 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2652 | { | |
2653 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
2654 | struct l2cap_chan *chan = conn->smp; |
2655 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
2656 | struct smp_csrk *csrk; |
2657 | ||
2e1614f7 | 2658 | bt_dev_dbg(conn->hcon->hdev, "conn %p", conn); |
7ee4ea36 MH |
2659 | |
2660 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2661 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 2662 | |
7ee4ea36 MH |
2663 | /* Mark the information as received */ |
2664 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
2665 | ||
2666 | skb_pull(skb, sizeof(*rp)); | |
2667 | ||
7ee4ea36 MH |
2668 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
2669 | if (csrk) { | |
4cd3928a JH |
2670 | if (conn->hcon->sec_level > BT_SECURITY_MEDIUM) |
2671 | csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED; | |
2672 | else | |
2673 | csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED; | |
7ee4ea36 MH |
2674 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); |
2675 | } | |
2676 | smp->csrk = csrk; | |
d6268e86 | 2677 | smp_distribute_keys(smp); |
7ee4ea36 MH |
2678 | |
2679 | return 0; | |
2680 | } | |
2681 | ||
5e3d3d9b JH |
2682 | static u8 sc_select_method(struct smp_chan *smp) |
2683 | { | |
2684 | struct l2cap_conn *conn = smp->conn; | |
2685 | struct hci_conn *hcon = conn->hcon; | |
2686 | struct smp_cmd_pairing *local, *remote; | |
2687 | u8 local_mitm, remote_mitm, local_io, remote_io, method; | |
2688 | ||
1a8bab4f JH |
2689 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) || |
2690 | test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) | |
a29b0733 JH |
2691 | return REQ_OOB; |
2692 | ||
5e3d3d9b JH |
2693 | /* The preq/prsp contain the raw Pairing Request/Response PDUs |
2694 | * which are needed as inputs to some crypto functions. To get | |
2695 | * the "struct smp_cmd_pairing" from them we need to skip the | |
2696 | * first byte which contains the opcode. | |
2697 | */ | |
2698 | if (hcon->out) { | |
2699 | local = (void *) &smp->preq[1]; | |
2700 | remote = (void *) &smp->prsp[1]; | |
2701 | } else { | |
2702 | local = (void *) &smp->prsp[1]; | |
2703 | remote = (void *) &smp->preq[1]; | |
2704 | } | |
2705 | ||
2706 | local_io = local->io_capability; | |
2707 | remote_io = remote->io_capability; | |
2708 | ||
2709 | local_mitm = (local->auth_req & SMP_AUTH_MITM); | |
2710 | remote_mitm = (remote->auth_req & SMP_AUTH_MITM); | |
2711 | ||
2712 | /* If either side wants MITM, look up the method from the table, | |
2713 | * otherwise use JUST WORKS. | |
2714 | */ | |
2715 | if (local_mitm || remote_mitm) | |
2716 | method = get_auth_method(smp, local_io, remote_io); | |
2717 | else | |
2718 | method = JUST_WORKS; | |
2719 | ||
2720 | /* Don't confirm locally initiated pairing attempts */ | |
2721 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) | |
2722 | method = JUST_WORKS; | |
2723 | ||
2724 | return method; | |
2725 | } | |
2726 | ||
d8f8edbe JH |
2727 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
2728 | { | |
2729 | struct smp_cmd_public_key *key = (void *) skb->data; | |
2730 | struct hci_conn *hcon = conn->hcon; | |
2731 | struct l2cap_chan *chan = conn->smp; | |
2732 | struct smp_chan *smp = chan->data; | |
5e3d3d9b | 2733 | struct hci_dev *hdev = hcon->hdev; |
c0153b0b | 2734 | struct crypto_kpp *tfm_ecdh; |
cbbbe3e2 | 2735 | struct smp_cmd_pairing_confirm cfm; |
d8f8edbe JH |
2736 | int err; |
2737 | ||
2e1614f7 | 2738 | bt_dev_dbg(hdev, "conn %p", conn); |
d8f8edbe JH |
2739 | |
2740 | if (skb->len < sizeof(*key)) | |
2741 | return SMP_INVALID_PARAMS; | |
2742 | ||
6d19628f LAD |
2743 | /* Check if remote and local public keys are the same and debug key is |
2744 | * not in use. | |
2745 | */ | |
2746 | if (!test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags) && | |
2747 | !crypto_memneq(key, smp->local_pk, 64)) { | |
2748 | bt_dev_err(hdev, "Remote and local public keys are identical"); | |
2749 | return SMP_UNSPECIFIED; | |
2750 | } | |
2751 | ||
d8f8edbe JH |
2752 | memcpy(smp->remote_pk, key, 64); |
2753 | ||
a8ca617c JH |
2754 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) { |
2755 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk, | |
2756 | smp->rr, 0, cfm.confirm_val); | |
2757 | if (err) | |
2758 | return SMP_UNSPECIFIED; | |
2759 | ||
329d8230 | 2760 | if (crypto_memneq(cfm.confirm_val, smp->pcnf, 16)) |
a8ca617c JH |
2761 | return SMP_CONFIRM_FAILED; |
2762 | } | |
2763 | ||
d8f8edbe JH |
2764 | /* Non-initiating device sends its public key after receiving |
2765 | * the key from the initiating device. | |
2766 | */ | |
2767 | if (!hcon->out) { | |
2768 | err = sc_send_public_key(smp); | |
2769 | if (err) | |
2770 | return err; | |
2771 | } | |
2772 | ||
c7a3d57d | 2773 | SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk); |
e091526d | 2774 | SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32); |
d8f8edbe | 2775 | |
c0153b0b TA |
2776 | /* Compute the shared secret on the same crypto tfm on which the private |
2777 | * key was set/generated. | |
2778 | */ | |
2779 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { | |
4ba5175f MK |
2780 | struct l2cap_chan *hchan = hdev->smp_data; |
2781 | struct smp_dev *smp_dev; | |
2782 | ||
2783 | if (!hchan || !hchan->data) | |
2784 | return SMP_UNSPECIFIED; | |
2785 | ||
2786 | smp_dev = hchan->data; | |
c0153b0b TA |
2787 | |
2788 | tfm_ecdh = smp_dev->tfm_ecdh; | |
2789 | } else { | |
2790 | tfm_ecdh = smp->tfm_ecdh; | |
2791 | } | |
2792 | ||
2793 | if (compute_ecdh_secret(tfm_ecdh, smp->remote_pk, smp->dhkey)) | |
d8f8edbe JH |
2794 | return SMP_UNSPECIFIED; |
2795 | ||
c7a3d57d | 2796 | SMP_DBG("DHKey %32phN", smp->dhkey); |
d8f8edbe JH |
2797 | |
2798 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
2799 | ||
5e3d3d9b JH |
2800 | smp->method = sc_select_method(smp); |
2801 | ||
2e1614f7 | 2802 | bt_dev_dbg(hdev, "selected method 0x%02x", smp->method); |
5e3d3d9b JH |
2803 | |
2804 | /* JUST_WORKS and JUST_CFM result in an unauthenticated key */ | |
2805 | if (smp->method == JUST_WORKS || smp->method == JUST_CFM) | |
2806 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; | |
2807 | else | |
2808 | hcon->pending_sec_level = BT_SECURITY_FIPS; | |
2809 | ||
329d8230 | 2810 | if (!crypto_memneq(debug_pk, smp->remote_pk, 64)) |
aeb7d461 JH |
2811 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); |
2812 | ||
38606f14 JH |
2813 | if (smp->method == DSP_PASSKEY) { |
2814 | get_random_bytes(&hcon->passkey_notify, | |
2815 | sizeof(hcon->passkey_notify)); | |
2816 | hcon->passkey_notify %= 1000000; | |
2817 | hcon->passkey_entered = 0; | |
2818 | smp->passkey_round = 0; | |
2819 | if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type, | |
2820 | hcon->dst_type, | |
2821 | hcon->passkey_notify, | |
2822 | hcon->passkey_entered)) | |
2823 | return SMP_UNSPECIFIED; | |
2824 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2825 | return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY); | |
2826 | } | |
2827 | ||
94ea7257 | 2828 | if (smp->method == REQ_OOB) { |
a29b0733 JH |
2829 | if (hcon->out) |
2830 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2831 | sizeof(smp->prnd), smp->prnd); | |
2832 | ||
2833 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2834 | ||
2835 | return 0; | |
2836 | } | |
2837 | ||
38606f14 JH |
2838 | if (hcon->out) |
2839 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2840 | ||
2841 | if (smp->method == REQ_PASSKEY) { | |
2842 | if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type, | |
2843 | hcon->dst_type)) | |
2844 | return SMP_UNSPECIFIED; | |
2845 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2846 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
2847 | return 0; | |
2848 | } | |
2849 | ||
cbbbe3e2 JH |
2850 | /* The Initiating device waits for the non-initiating device to |
2851 | * send the confirm value. | |
2852 | */ | |
2853 | if (conn->hcon->out) | |
2854 | return 0; | |
2855 | ||
2856 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, | |
2857 | 0, cfm.confirm_val); | |
2858 | if (err) | |
2859 | return SMP_UNSPECIFIED; | |
2860 | ||
2861 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
2862 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2863 | ||
d8f8edbe JH |
2864 | return 0; |
2865 | } | |
2866 | ||
6433a9a2 JH |
2867 | static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb) |
2868 | { | |
2869 | struct smp_cmd_dhkey_check *check = (void *) skb->data; | |
2870 | struct l2cap_chan *chan = conn->smp; | |
2871 | struct hci_conn *hcon = conn->hcon; | |
2872 | struct smp_chan *smp = chan->data; | |
2873 | u8 a[7], b[7], *local_addr, *remote_addr; | |
2874 | u8 io_cap[3], r[16], e[16]; | |
2875 | int err; | |
2876 | ||
2e1614f7 | 2877 | bt_dev_dbg(hcon->hdev, "conn %p", conn); |
6433a9a2 JH |
2878 | |
2879 | if (skb->len < sizeof(*check)) | |
2880 | return SMP_INVALID_PARAMS; | |
2881 | ||
2882 | memcpy(a, &hcon->init_addr, 6); | |
2883 | memcpy(b, &hcon->resp_addr, 6); | |
2884 | a[6] = hcon->init_addr_type; | |
2885 | b[6] = hcon->resp_addr_type; | |
2886 | ||
2887 | if (hcon->out) { | |
2888 | local_addr = a; | |
2889 | remote_addr = b; | |
2890 | memcpy(io_cap, &smp->prsp[1], 3); | |
2891 | } else { | |
2892 | local_addr = b; | |
2893 | remote_addr = a; | |
2894 | memcpy(io_cap, &smp->preq[1], 3); | |
2895 | } | |
2896 | ||
2897 | memset(r, 0, sizeof(r)); | |
2898 | ||
38606f14 JH |
2899 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2900 | put_unaligned_le32(hcon->passkey_notify, r); | |
882fafad JH |
2901 | else if (smp->method == REQ_OOB) |
2902 | memcpy(r, smp->lr, 16); | |
38606f14 | 2903 | |
6433a9a2 JH |
2904 | err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r, |
2905 | io_cap, remote_addr, local_addr, e); | |
2906 | if (err) | |
2907 | return SMP_UNSPECIFIED; | |
2908 | ||
329d8230 | 2909 | if (crypto_memneq(check->e, e, 16)) |
6433a9a2 JH |
2910 | return SMP_DHKEY_CHECK_FAILED; |
2911 | ||
d3e54a87 JH |
2912 | if (!hcon->out) { |
2913 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
2914 | set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags); | |
2915 | return 0; | |
2916 | } | |
d378a2d7 | 2917 | |
fad646e1 | 2918 | /* Responder sends DHKey check as response to initiator */ |
d3e54a87 JH |
2919 | sc_dhkey_check(smp); |
2920 | } | |
d378a2d7 | 2921 | |
d3e54a87 | 2922 | sc_add_ltk(smp); |
6433a9a2 JH |
2923 | |
2924 | if (hcon->out) { | |
8b76ce34 | 2925 | hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size); |
6433a9a2 JH |
2926 | hcon->enc_key_size = smp->enc_key_size; |
2927 | } | |
2928 | ||
2929 | return 0; | |
2930 | } | |
2931 | ||
1408bb6e JH |
2932 | static int smp_cmd_keypress_notify(struct l2cap_conn *conn, |
2933 | struct sk_buff *skb) | |
2934 | { | |
2935 | struct smp_cmd_keypress_notify *kp = (void *) skb->data; | |
2936 | ||
2e1614f7 | 2937 | bt_dev_dbg(conn->hcon->hdev, "value 0x%02x", kp->value); |
1408bb6e JH |
2938 | |
2939 | return 0; | |
2940 | } | |
2941 | ||
4befb867 | 2942 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 2943 | { |
5d88cc73 | 2944 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 2945 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 2946 | struct smp_chan *smp; |
92381f5c | 2947 | __u8 code, reason; |
eb492e01 AB |
2948 | int err = 0; |
2949 | ||
8ae9b984 | 2950 | if (skb->len < 1) |
92381f5c | 2951 | return -EILSEQ; |
92381f5c | 2952 | |
d7a5a11d | 2953 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) { |
2e65c9d2 AG |
2954 | reason = SMP_PAIRING_NOTSUPP; |
2955 | goto done; | |
2956 | } | |
2957 | ||
92381f5c | 2958 | code = skb->data[0]; |
eb492e01 AB |
2959 | skb_pull(skb, sizeof(code)); |
2960 | ||
b28b4943 JH |
2961 | smp = chan->data; |
2962 | ||
2963 | if (code > SMP_CMD_MAX) | |
2964 | goto drop; | |
2965 | ||
24bd0bd9 | 2966 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
2967 | goto drop; |
2968 | ||
2969 | /* If we don't have a context the only allowed commands are | |
2970 | * pairing request and security request. | |
8cf9fa12 | 2971 | */ |
b28b4943 JH |
2972 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
2973 | goto drop; | |
8cf9fa12 | 2974 | |
eb492e01 AB |
2975 | switch (code) { |
2976 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 2977 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
2978 | break; |
2979 | ||
2980 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 2981 | smp_failure(conn, 0); |
da85e5e5 | 2982 | err = -EPERM; |
eb492e01 AB |
2983 | break; |
2984 | ||
2985 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 2986 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
2987 | break; |
2988 | ||
2989 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 2990 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
2991 | break; |
2992 | ||
eb492e01 | 2993 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 2994 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
2995 | break; |
2996 | ||
eb492e01 | 2997 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 2998 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
2999 | break; |
3000 | ||
eb492e01 | 3001 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
3002 | reason = smp_cmd_encrypt_info(conn, skb); |
3003 | break; | |
3004 | ||
fad646e1 AP |
3005 | case SMP_CMD_INITIATOR_IDENT: |
3006 | reason = smp_cmd_initiator_ident(conn, skb); | |
7034b911 VCG |
3007 | break; |
3008 | ||
eb492e01 | 3009 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
3010 | reason = smp_cmd_ident_info(conn, skb); |
3011 | break; | |
3012 | ||
eb492e01 | 3013 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
3014 | reason = smp_cmd_ident_addr_info(conn, skb); |
3015 | break; | |
3016 | ||
eb492e01 | 3017 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 3018 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
3019 | break; |
3020 | ||
d8f8edbe JH |
3021 | case SMP_CMD_PUBLIC_KEY: |
3022 | reason = smp_cmd_public_key(conn, skb); | |
3023 | break; | |
3024 | ||
6433a9a2 JH |
3025 | case SMP_CMD_DHKEY_CHECK: |
3026 | reason = smp_cmd_dhkey_check(conn, skb); | |
3027 | break; | |
3028 | ||
1408bb6e JH |
3029 | case SMP_CMD_KEYPRESS_NOTIFY: |
3030 | reason = smp_cmd_keypress_notify(conn, skb); | |
3031 | break; | |
3032 | ||
eb492e01 | 3033 | default: |
2e1614f7 | 3034 | bt_dev_dbg(hcon->hdev, "Unknown command code 0x%2.2x", code); |
eb492e01 | 3035 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 3036 | goto done; |
eb492e01 AB |
3037 | } |
3038 | ||
3a0259bb | 3039 | done: |
9b7b18ef JH |
3040 | if (!err) { |
3041 | if (reason) | |
3042 | smp_failure(conn, reason); | |
8ae9b984 | 3043 | kfree_skb(skb); |
9b7b18ef JH |
3044 | } |
3045 | ||
eb492e01 | 3046 | return err; |
b28b4943 JH |
3047 | |
3048 | drop: | |
2064ee33 MH |
3049 | bt_dev_err(hcon->hdev, "unexpected SMP command 0x%02x from %pMR", |
3050 | code, &hcon->dst); | |
b28b4943 JH |
3051 | kfree_skb(skb); |
3052 | return 0; | |
eb492e01 | 3053 | } |
7034b911 | 3054 | |
70db83c4 JH |
3055 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
3056 | { | |
3057 | struct l2cap_conn *conn = chan->conn; | |
3058 | ||
2e1614f7 | 3059 | bt_dev_dbg(conn->hcon->hdev, "chan %p", chan); |
70db83c4 | 3060 | |
fc75cc86 | 3061 | if (chan->data) |
5d88cc73 | 3062 | smp_chan_destroy(conn); |
5d88cc73 | 3063 | |
70db83c4 JH |
3064 | conn->smp = NULL; |
3065 | l2cap_chan_put(chan); | |
3066 | } | |
3067 | ||
b5ae344d JH |
3068 | static void bredr_pairing(struct l2cap_chan *chan) |
3069 | { | |
3070 | struct l2cap_conn *conn = chan->conn; | |
3071 | struct hci_conn *hcon = conn->hcon; | |
3072 | struct hci_dev *hdev = hcon->hdev; | |
3073 | struct smp_cmd_pairing req; | |
3074 | struct smp_chan *smp; | |
3075 | ||
2e1614f7 | 3076 | bt_dev_dbg(hdev, "chan %p", chan); |
b5ae344d JH |
3077 | |
3078 | /* Only new pairings are interesting */ | |
3079 | if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags)) | |
3080 | return; | |
3081 | ||
3082 | /* Don't bother if we're not encrypted */ | |
3083 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
3084 | return; | |
3085 | ||
74be523c | 3086 | /* Only initiator may initiate SMP over BR/EDR */ |
b5ae344d JH |
3087 | if (hcon->role != HCI_ROLE_MASTER) |
3088 | return; | |
3089 | ||
3090 | /* Secure Connections support must be enabled */ | |
d7a5a11d | 3091 | if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED)) |
b5ae344d JH |
3092 | return; |
3093 | ||
3094 | /* BR/EDR must use Secure Connections for SMP */ | |
3095 | if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) && | |
b7cb93e5 | 3096 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
3097 | return; |
3098 | ||
3099 | /* If our LE support is not enabled don't do anything */ | |
d7a5a11d | 3100 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
b5ae344d JH |
3101 | return; |
3102 | ||
3103 | /* Don't bother if remote LE support is not enabled */ | |
3104 | if (!lmp_host_le_capable(hcon)) | |
3105 | return; | |
3106 | ||
3107 | /* Remote must support SMP fixed chan for BR/EDR */ | |
3108 | if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR)) | |
3109 | return; | |
3110 | ||
3111 | /* Don't bother if SMP is already ongoing */ | |
3112 | if (chan->data) | |
3113 | return; | |
3114 | ||
3115 | smp = smp_chan_create(conn); | |
3116 | if (!smp) { | |
2064ee33 | 3117 | bt_dev_err(hdev, "unable to create SMP context for BR/EDR"); |
b5ae344d JH |
3118 | return; |
3119 | } | |
3120 | ||
3121 | set_bit(SMP_FLAG_SC, &smp->flags); | |
3122 | ||
2e1614f7 | 3123 | bt_dev_dbg(hdev, "starting SMP over BR/EDR"); |
b5ae344d JH |
3124 | |
3125 | /* Prepare and send the BR/EDR SMP Pairing Request */ | |
3126 | build_bredr_pairing_cmd(smp, &req, NULL); | |
3127 | ||
3128 | smp->preq[0] = SMP_CMD_PAIRING_REQ; | |
3129 | memcpy(&smp->preq[1], &req, sizeof(req)); | |
3130 | ||
3131 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req); | |
3132 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); | |
3133 | } | |
3134 | ||
44f1a7ab JH |
3135 | static void smp_resume_cb(struct l2cap_chan *chan) |
3136 | { | |
b68fda68 | 3137 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
3138 | struct l2cap_conn *conn = chan->conn; |
3139 | struct hci_conn *hcon = conn->hcon; | |
3140 | ||
2e1614f7 | 3141 | bt_dev_dbg(hcon->hdev, "chan %p", chan); |
44f1a7ab | 3142 | |
b5ae344d JH |
3143 | if (hcon->type == ACL_LINK) { |
3144 | bredr_pairing(chan); | |
ef8efe4b | 3145 | return; |
b5ae344d | 3146 | } |
ef8efe4b | 3147 | |
86d1407c JH |
3148 | if (!smp) |
3149 | return; | |
b68fda68 | 3150 | |
84bc0db5 JH |
3151 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
3152 | return; | |
3153 | ||
86d1407c JH |
3154 | cancel_delayed_work(&smp->security_timer); |
3155 | ||
d6268e86 | 3156 | smp_distribute_keys(smp); |
44f1a7ab JH |
3157 | } |
3158 | ||
70db83c4 JH |
3159 | static void smp_ready_cb(struct l2cap_chan *chan) |
3160 | { | |
3161 | struct l2cap_conn *conn = chan->conn; | |
b5ae344d | 3162 | struct hci_conn *hcon = conn->hcon; |
70db83c4 | 3163 | |
2e1614f7 | 3164 | bt_dev_dbg(hcon->hdev, "chan %p", chan); |
70db83c4 | 3165 | |
7883746b JH |
3166 | /* No need to call l2cap_chan_hold() here since we already own |
3167 | * the reference taken in smp_new_conn_cb(). This is just the | |
3168 | * first time that we tie it to a specific pointer. The code in | |
3169 | * l2cap_core.c ensures that there's no risk this function wont | |
3170 | * get called if smp_new_conn_cb was previously called. | |
3171 | */ | |
70db83c4 | 3172 | conn->smp = chan; |
b5ae344d JH |
3173 | |
3174 | if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
3175 | bredr_pairing(chan); | |
70db83c4 JH |
3176 | } |
3177 | ||
4befb867 JH |
3178 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
3179 | { | |
3180 | int err; | |
3181 | ||
2e1614f7 | 3182 | bt_dev_dbg(chan->conn->hcon->hdev, "chan %p", chan); |
4befb867 JH |
3183 | |
3184 | err = smp_sig_channel(chan, skb); | |
3185 | if (err) { | |
b68fda68 | 3186 | struct smp_chan *smp = chan->data; |
4befb867 | 3187 | |
b68fda68 JH |
3188 | if (smp) |
3189 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 3190 | |
1e91c29e | 3191 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
3192 | } |
3193 | ||
3194 | return err; | |
3195 | } | |
3196 | ||
70db83c4 JH |
3197 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
3198 | unsigned long hdr_len, | |
3199 | unsigned long len, int nb) | |
3200 | { | |
3201 | struct sk_buff *skb; | |
3202 | ||
3203 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
3204 | if (!skb) | |
3205 | return ERR_PTR(-ENOMEM); | |
3206 | ||
3207 | skb->priority = HCI_PRIO_MAX; | |
a4368ff3 | 3208 | bt_cb(skb)->l2cap.chan = chan; |
70db83c4 JH |
3209 | |
3210 | return skb; | |
3211 | } | |
3212 | ||
3213 | static const struct l2cap_ops smp_chan_ops = { | |
3214 | .name = "Security Manager", | |
3215 | .ready = smp_ready_cb, | |
5d88cc73 | 3216 | .recv = smp_recv_cb, |
70db83c4 JH |
3217 | .alloc_skb = smp_alloc_skb_cb, |
3218 | .teardown = smp_teardown_cb, | |
44f1a7ab | 3219 | .resume = smp_resume_cb, |
70db83c4 JH |
3220 | |
3221 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
3222 | .state_change = l2cap_chan_no_state_change, |
3223 | .close = l2cap_chan_no_close, | |
3224 | .defer = l2cap_chan_no_defer, | |
3225 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
3226 | .set_shutdown = l2cap_chan_no_set_shutdown, |
3227 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3228 | }; |
3229 | ||
3230 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
3231 | { | |
3232 | struct l2cap_chan *chan; | |
3233 | ||
995fca15 | 3234 | BT_DBG("pchan %p", pchan); |
70db83c4 JH |
3235 | |
3236 | chan = l2cap_chan_create(); | |
3237 | if (!chan) | |
3238 | return NULL; | |
3239 | ||
3240 | chan->chan_type = pchan->chan_type; | |
3241 | chan->ops = &smp_chan_ops; | |
3242 | chan->scid = pchan->scid; | |
3243 | chan->dcid = chan->scid; | |
3244 | chan->imtu = pchan->imtu; | |
3245 | chan->omtu = pchan->omtu; | |
3246 | chan->mode = pchan->mode; | |
3247 | ||
abe84903 JH |
3248 | /* Other L2CAP channels may request SMP routines in order to |
3249 | * change the security level. This means that the SMP channel | |
3250 | * lock must be considered in its own category to avoid lockdep | |
3251 | * warnings. | |
3252 | */ | |
3253 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
3254 | ||
995fca15 | 3255 | BT_DBG("created chan %p", chan); |
70db83c4 JH |
3256 | |
3257 | return chan; | |
3258 | } | |
3259 | ||
3260 | static const struct l2cap_ops smp_root_chan_ops = { | |
3261 | .name = "Security Manager Root", | |
3262 | .new_connection = smp_new_conn_cb, | |
3263 | ||
3264 | /* None of these are implemented for the root channel */ | |
3265 | .close = l2cap_chan_no_close, | |
3266 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
3267 | .recv = l2cap_chan_no_recv, | |
3268 | .state_change = l2cap_chan_no_state_change, | |
3269 | .teardown = l2cap_chan_no_teardown, | |
3270 | .ready = l2cap_chan_no_ready, | |
3271 | .defer = l2cap_chan_no_defer, | |
3272 | .suspend = l2cap_chan_no_suspend, | |
3273 | .resume = l2cap_chan_no_resume, | |
3274 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
3275 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3276 | }; |
3277 | ||
ef8efe4b | 3278 | static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) |
711eafe3 | 3279 | { |
70db83c4 | 3280 | struct l2cap_chan *chan; |
88a479d9 | 3281 | struct smp_dev *smp; |
71af2f6b | 3282 | struct crypto_shash *tfm_cmac; |
47eb2ac8 | 3283 | struct crypto_kpp *tfm_ecdh; |
70db83c4 | 3284 | |
ef8efe4b | 3285 | if (cid == L2CAP_CID_SMP_BREDR) { |
88a479d9 | 3286 | smp = NULL; |
ef8efe4b JH |
3287 | goto create_chan; |
3288 | } | |
711eafe3 | 3289 | |
88a479d9 MH |
3290 | smp = kzalloc(sizeof(*smp), GFP_KERNEL); |
3291 | if (!smp) | |
3292 | return ERR_PTR(-ENOMEM); | |
3293 | ||
71af2f6b | 3294 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
6e2dc6d1 | 3295 | if (IS_ERR(tfm_cmac)) { |
2e1614f7 | 3296 | bt_dev_err(hdev, "Unable to create CMAC crypto context"); |
453431a5 | 3297 | kfree_sensitive(smp); |
6e2dc6d1 MH |
3298 | return ERR_CAST(tfm_cmac); |
3299 | } | |
3300 | ||
6763f5ea | 3301 | tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0); |
47eb2ac8 | 3302 | if (IS_ERR(tfm_ecdh)) { |
2e1614f7 | 3303 | bt_dev_err(hdev, "Unable to create ECDH crypto context"); |
47eb2ac8 | 3304 | crypto_free_shash(tfm_cmac); |
453431a5 | 3305 | kfree_sensitive(smp); |
47eb2ac8 TA |
3306 | return ERR_CAST(tfm_ecdh); |
3307 | } | |
3308 | ||
94f14e47 | 3309 | smp->local_oob = false; |
6e2dc6d1 | 3310 | smp->tfm_cmac = tfm_cmac; |
47eb2ac8 | 3311 | smp->tfm_ecdh = tfm_ecdh; |
88a479d9 | 3312 | |
ef8efe4b | 3313 | create_chan: |
70db83c4 JH |
3314 | chan = l2cap_chan_create(); |
3315 | if (!chan) { | |
63511f6d | 3316 | if (smp) { |
71af2f6b | 3317 | crypto_free_shash(smp->tfm_cmac); |
47eb2ac8 | 3318 | crypto_free_kpp(smp->tfm_ecdh); |
453431a5 | 3319 | kfree_sensitive(smp); |
63511f6d | 3320 | } |
ef8efe4b | 3321 | return ERR_PTR(-ENOMEM); |
70db83c4 JH |
3322 | } |
3323 | ||
88a479d9 | 3324 | chan->data = smp; |
defce9e8 | 3325 | |
ef8efe4b | 3326 | l2cap_add_scid(chan, cid); |
70db83c4 JH |
3327 | |
3328 | l2cap_chan_set_defaults(chan); | |
3329 | ||
157029ba | 3330 | if (cid == L2CAP_CID_SMP) { |
39e3e744 JH |
3331 | u8 bdaddr_type; |
3332 | ||
3333 | hci_copy_identity_address(hdev, &chan->src, &bdaddr_type); | |
3334 | ||
3335 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) | |
157029ba | 3336 | chan->src_type = BDADDR_LE_PUBLIC; |
39e3e744 JH |
3337 | else |
3338 | chan->src_type = BDADDR_LE_RANDOM; | |
157029ba MH |
3339 | } else { |
3340 | bacpy(&chan->src, &hdev->bdaddr); | |
ef8efe4b | 3341 | chan->src_type = BDADDR_BREDR; |
157029ba MH |
3342 | } |
3343 | ||
70db83c4 JH |
3344 | chan->state = BT_LISTEN; |
3345 | chan->mode = L2CAP_MODE_BASIC; | |
3346 | chan->imtu = L2CAP_DEFAULT_MTU; | |
3347 | chan->ops = &smp_root_chan_ops; | |
3348 | ||
abe84903 JH |
3349 | /* Set correct nesting level for a parent/listening channel */ |
3350 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
3351 | ||
ef8efe4b | 3352 | return chan; |
711eafe3 JH |
3353 | } |
3354 | ||
ef8efe4b | 3355 | static void smp_del_chan(struct l2cap_chan *chan) |
711eafe3 | 3356 | { |
88a479d9 | 3357 | struct smp_dev *smp; |
70db83c4 | 3358 | |
995fca15 | 3359 | BT_DBG("chan %p", chan); |
711eafe3 | 3360 | |
88a479d9 MH |
3361 | smp = chan->data; |
3362 | if (smp) { | |
defce9e8 | 3363 | chan->data = NULL; |
71af2f6b | 3364 | crypto_free_shash(smp->tfm_cmac); |
47eb2ac8 | 3365 | crypto_free_kpp(smp->tfm_ecdh); |
453431a5 | 3366 | kfree_sensitive(smp); |
711eafe3 | 3367 | } |
70db83c4 | 3368 | |
70db83c4 | 3369 | l2cap_chan_put(chan); |
711eafe3 | 3370 | } |
ef8efe4b | 3371 | |
82493316 | 3372 | int smp_force_bredr(struct hci_dev *hdev, bool enable) |
300acfde | 3373 | { |
b7cb93e5 | 3374 | if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
300acfde MH |
3375 | return -EALREADY; |
3376 | ||
3377 | if (enable) { | |
3378 | struct l2cap_chan *chan; | |
3379 | ||
3380 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); | |
3381 | if (IS_ERR(chan)) | |
3382 | return PTR_ERR(chan); | |
3383 | ||
3384 | hdev->smp_bredr_data = chan; | |
3385 | } else { | |
3386 | struct l2cap_chan *chan; | |
3387 | ||
3388 | chan = hdev->smp_bredr_data; | |
3389 | hdev->smp_bredr_data = NULL; | |
3390 | smp_del_chan(chan); | |
3391 | } | |
3392 | ||
b7cb93e5 | 3393 | hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); |
300acfde | 3394 | |
82493316 | 3395 | return 0; |
300acfde MH |
3396 | } |
3397 | ||
ef8efe4b JH |
3398 | int smp_register(struct hci_dev *hdev) |
3399 | { | |
3400 | struct l2cap_chan *chan; | |
3401 | ||
2e1614f7 | 3402 | bt_dev_dbg(hdev, ""); |
ef8efe4b | 3403 | |
7e7ec445 MH |
3404 | /* If the controller does not support Low Energy operation, then |
3405 | * there is also no need to register any SMP channel. | |
3406 | */ | |
3407 | if (!lmp_le_capable(hdev)) | |
3408 | return 0; | |
3409 | ||
2b8df323 MH |
3410 | if (WARN_ON(hdev->smp_data)) { |
3411 | chan = hdev->smp_data; | |
3412 | hdev->smp_data = NULL; | |
3413 | smp_del_chan(chan); | |
3414 | } | |
3415 | ||
ef8efe4b JH |
3416 | chan = smp_add_cid(hdev, L2CAP_CID_SMP); |
3417 | if (IS_ERR(chan)) | |
3418 | return PTR_ERR(chan); | |
3419 | ||
3420 | hdev->smp_data = chan; | |
3421 | ||
300acfde | 3422 | if (!lmp_sc_capable(hdev)) { |
83ebb9ec SJ |
3423 | /* Flag can be already set here (due to power toggle) */ |
3424 | if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) | |
3425 | return 0; | |
300acfde | 3426 | } |
ef8efe4b | 3427 | |
2b8df323 MH |
3428 | if (WARN_ON(hdev->smp_bredr_data)) { |
3429 | chan = hdev->smp_bredr_data; | |
3430 | hdev->smp_bredr_data = NULL; | |
3431 | smp_del_chan(chan); | |
3432 | } | |
3433 | ||
ef8efe4b JH |
3434 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); |
3435 | if (IS_ERR(chan)) { | |
3436 | int err = PTR_ERR(chan); | |
3437 | chan = hdev->smp_data; | |
3438 | hdev->smp_data = NULL; | |
3439 | smp_del_chan(chan); | |
3440 | return err; | |
3441 | } | |
3442 | ||
3443 | hdev->smp_bredr_data = chan; | |
3444 | ||
3445 | return 0; | |
3446 | } | |
3447 | ||
3448 | void smp_unregister(struct hci_dev *hdev) | |
3449 | { | |
3450 | struct l2cap_chan *chan; | |
3451 | ||
3452 | if (hdev->smp_bredr_data) { | |
3453 | chan = hdev->smp_bredr_data; | |
3454 | hdev->smp_bredr_data = NULL; | |
3455 | smp_del_chan(chan); | |
3456 | } | |
3457 | ||
3458 | if (hdev->smp_data) { | |
3459 | chan = hdev->smp_data; | |
3460 | hdev->smp_data = NULL; | |
3461 | smp_del_chan(chan); | |
3462 | } | |
3463 | } | |
0a2b0f04 JH |
3464 | |
3465 | #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP) | |
3466 | ||
47eb2ac8 | 3467 | static int __init test_debug_key(struct crypto_kpp *tfm_ecdh) |
71653eb6 | 3468 | { |
c0153b0b | 3469 | u8 pk[64]; |
a2976416 | 3470 | int err; |
71653eb6 | 3471 | |
c0153b0b | 3472 | err = set_ecdh_privkey(tfm_ecdh, debug_sk); |
a2976416 TA |
3473 | if (err) |
3474 | return err; | |
71653eb6 | 3475 | |
c0153b0b TA |
3476 | err = generate_ecdh_public_key(tfm_ecdh, pk); |
3477 | if (err) | |
3478 | return err; | |
71653eb6 | 3479 | |
329d8230 | 3480 | if (crypto_memneq(pk, debug_pk, 64)) |
71653eb6 MH |
3481 | return -EINVAL; |
3482 | ||
3483 | return 0; | |
3484 | } | |
3485 | ||
28a220aa | 3486 | static int __init test_ah(void) |
cfc4198e JH |
3487 | { |
3488 | const u8 irk[16] = { | |
3489 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3490 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3491 | const u8 r[3] = { 0x94, 0x81, 0x70 }; | |
3492 | const u8 exp[3] = { 0xaa, 0xfb, 0x0d }; | |
3493 | u8 res[3]; | |
3494 | int err; | |
3495 | ||
28a220aa | 3496 | err = smp_ah(irk, r, res); |
cfc4198e JH |
3497 | if (err) |
3498 | return err; | |
3499 | ||
329d8230 | 3500 | if (crypto_memneq(res, exp, 3)) |
cfc4198e JH |
3501 | return -EINVAL; |
3502 | ||
3503 | return 0; | |
3504 | } | |
3505 | ||
28a220aa | 3506 | static int __init test_c1(void) |
cfc4198e JH |
3507 | { |
3508 | const u8 k[16] = { | |
3509 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3510 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3511 | const u8 r[16] = { | |
3512 | 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63, | |
3513 | 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 }; | |
3514 | const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 }; | |
3515 | const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 }; | |
3516 | const u8 _iat = 0x01; | |
3517 | const u8 _rat = 0x00; | |
3518 | const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } }; | |
3519 | const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } }; | |
3520 | const u8 exp[16] = { | |
3521 | 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2, | |
3522 | 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e }; | |
3523 | u8 res[16]; | |
3524 | int err; | |
3525 | ||
28a220aa | 3526 | err = smp_c1(k, r, preq, pres, _iat, &ia, _rat, &ra, res); |
cfc4198e JH |
3527 | if (err) |
3528 | return err; | |
3529 | ||
329d8230 | 3530 | if (crypto_memneq(res, exp, 16)) |
cfc4198e JH |
3531 | return -EINVAL; |
3532 | ||
3533 | return 0; | |
3534 | } | |
3535 | ||
28a220aa | 3536 | static int __init test_s1(void) |
cfc4198e JH |
3537 | { |
3538 | const u8 k[16] = { | |
3539 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3540 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3541 | const u8 r1[16] = { | |
3542 | 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }; | |
3543 | const u8 r2[16] = { | |
3544 | 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 }; | |
3545 | const u8 exp[16] = { | |
3546 | 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b, | |
3547 | 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a }; | |
3548 | u8 res[16]; | |
3549 | int err; | |
3550 | ||
28a220aa | 3551 | err = smp_s1(k, r1, r2, res); |
cfc4198e JH |
3552 | if (err) |
3553 | return err; | |
3554 | ||
329d8230 | 3555 | if (crypto_memneq(res, exp, 16)) |
cfc4198e JH |
3556 | return -EINVAL; |
3557 | ||
3558 | return 0; | |
3559 | } | |
3560 | ||
71af2f6b | 3561 | static int __init test_f4(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3562 | { |
3563 | const u8 u[32] = { | |
3564 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3565 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3566 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3567 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3568 | const u8 v[32] = { | |
3569 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3570 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3571 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3572 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3573 | const u8 x[16] = { | |
3574 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3575 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3576 | const u8 z = 0x00; | |
3577 | const u8 exp[16] = { | |
3578 | 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1, | |
3579 | 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 }; | |
3580 | u8 res[16]; | |
3581 | int err; | |
3582 | ||
3583 | err = smp_f4(tfm_cmac, u, v, x, z, res); | |
3584 | if (err) | |
3585 | return err; | |
3586 | ||
329d8230 | 3587 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3588 | return -EINVAL; |
3589 | ||
3590 | return 0; | |
3591 | } | |
3592 | ||
71af2f6b | 3593 | static int __init test_f5(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3594 | { |
3595 | const u8 w[32] = { | |
3596 | 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86, | |
3597 | 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99, | |
3598 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3599 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3600 | const u8 n1[16] = { | |
3601 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3602 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3603 | const u8 n2[16] = { | |
3604 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3605 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3606 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3607 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3608 | const u8 exp_ltk[16] = { | |
3609 | 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98, | |
3610 | 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 }; | |
3611 | const u8 exp_mackey[16] = { | |
3612 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3613 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3614 | u8 mackey[16], ltk[16]; | |
3615 | int err; | |
3616 | ||
3617 | err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk); | |
3618 | if (err) | |
3619 | return err; | |
3620 | ||
329d8230 | 3621 | if (crypto_memneq(mackey, exp_mackey, 16)) |
fb2969a3 JH |
3622 | return -EINVAL; |
3623 | ||
329d8230 | 3624 | if (crypto_memneq(ltk, exp_ltk, 16)) |
fb2969a3 JH |
3625 | return -EINVAL; |
3626 | ||
3627 | return 0; | |
3628 | } | |
3629 | ||
71af2f6b | 3630 | static int __init test_f6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3631 | { |
3632 | const u8 w[16] = { | |
3633 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3634 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3635 | const u8 n1[16] = { | |
3636 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3637 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3638 | const u8 n2[16] = { | |
3639 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3640 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3641 | const u8 r[16] = { | |
3642 | 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08, | |
3643 | 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 }; | |
3644 | const u8 io_cap[3] = { 0x02, 0x01, 0x01 }; | |
3645 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3646 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3647 | const u8 exp[16] = { | |
3648 | 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2, | |
3649 | 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 }; | |
3650 | u8 res[16]; | |
3651 | int err; | |
3652 | ||
3653 | err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res); | |
3654 | if (err) | |
3655 | return err; | |
3656 | ||
329d8230 | 3657 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3658 | return -EINVAL; |
3659 | ||
3660 | return 0; | |
3661 | } | |
3662 | ||
71af2f6b | 3663 | static int __init test_g2(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3664 | { |
3665 | const u8 u[32] = { | |
3666 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3667 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3668 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3669 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3670 | const u8 v[32] = { | |
3671 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3672 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3673 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3674 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3675 | const u8 x[16] = { | |
3676 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3677 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3678 | const u8 y[16] = { | |
3679 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3680 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3681 | const u32 exp_val = 0x2f9ed5ba % 1000000; | |
3682 | u32 val; | |
3683 | int err; | |
3684 | ||
3685 | err = smp_g2(tfm_cmac, u, v, x, y, &val); | |
3686 | if (err) | |
3687 | return err; | |
3688 | ||
3689 | if (val != exp_val) | |
3690 | return -EINVAL; | |
3691 | ||
3692 | return 0; | |
3693 | } | |
3694 | ||
71af2f6b | 3695 | static int __init test_h6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3696 | { |
3697 | const u8 w[16] = { | |
3698 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3699 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3700 | const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
3701 | const u8 exp[16] = { | |
3702 | 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8, | |
3703 | 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d }; | |
3704 | u8 res[16]; | |
3705 | int err; | |
3706 | ||
3707 | err = smp_h6(tfm_cmac, w, key_id, res); | |
3708 | if (err) | |
3709 | return err; | |
3710 | ||
329d8230 | 3711 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3712 | return -EINVAL; |
3713 | ||
3714 | return 0; | |
3715 | } | |
3716 | ||
64dd374e MH |
3717 | static char test_smp_buffer[32]; |
3718 | ||
3719 | static ssize_t test_smp_read(struct file *file, char __user *user_buf, | |
3720 | size_t count, loff_t *ppos) | |
3721 | { | |
3722 | return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer, | |
3723 | strlen(test_smp_buffer)); | |
3724 | } | |
3725 | ||
3726 | static const struct file_operations test_smp_fops = { | |
3727 | .open = simple_open, | |
3728 | .read = test_smp_read, | |
3729 | .llseek = default_llseek, | |
3730 | }; | |
3731 | ||
28a220aa | 3732 | static int __init run_selftests(struct crypto_shash *tfm_cmac, |
47eb2ac8 | 3733 | struct crypto_kpp *tfm_ecdh) |
0a2b0f04 | 3734 | { |
255047b0 MH |
3735 | ktime_t calltime, delta, rettime; |
3736 | unsigned long long duration; | |
cfc4198e JH |
3737 | int err; |
3738 | ||
255047b0 MH |
3739 | calltime = ktime_get(); |
3740 | ||
47eb2ac8 | 3741 | err = test_debug_key(tfm_ecdh); |
71653eb6 MH |
3742 | if (err) { |
3743 | BT_ERR("debug_key test failed"); | |
3744 | goto done; | |
3745 | } | |
3746 | ||
28a220aa | 3747 | err = test_ah(); |
cfc4198e JH |
3748 | if (err) { |
3749 | BT_ERR("smp_ah test failed"); | |
64dd374e | 3750 | goto done; |
cfc4198e JH |
3751 | } |
3752 | ||
28a220aa | 3753 | err = test_c1(); |
cfc4198e JH |
3754 | if (err) { |
3755 | BT_ERR("smp_c1 test failed"); | |
64dd374e | 3756 | goto done; |
cfc4198e JH |
3757 | } |
3758 | ||
28a220aa | 3759 | err = test_s1(); |
cfc4198e JH |
3760 | if (err) { |
3761 | BT_ERR("smp_s1 test failed"); | |
64dd374e | 3762 | goto done; |
cfc4198e JH |
3763 | } |
3764 | ||
fb2969a3 JH |
3765 | err = test_f4(tfm_cmac); |
3766 | if (err) { | |
3767 | BT_ERR("smp_f4 test failed"); | |
64dd374e | 3768 | goto done; |
fb2969a3 JH |
3769 | } |
3770 | ||
3771 | err = test_f5(tfm_cmac); | |
3772 | if (err) { | |
3773 | BT_ERR("smp_f5 test failed"); | |
64dd374e | 3774 | goto done; |
fb2969a3 JH |
3775 | } |
3776 | ||
3777 | err = test_f6(tfm_cmac); | |
3778 | if (err) { | |
3779 | BT_ERR("smp_f6 test failed"); | |
64dd374e | 3780 | goto done; |
fb2969a3 JH |
3781 | } |
3782 | ||
3783 | err = test_g2(tfm_cmac); | |
3784 | if (err) { | |
3785 | BT_ERR("smp_g2 test failed"); | |
64dd374e | 3786 | goto done; |
fb2969a3 JH |
3787 | } |
3788 | ||
3789 | err = test_h6(tfm_cmac); | |
3790 | if (err) { | |
3791 | BT_ERR("smp_h6 test failed"); | |
64dd374e | 3792 | goto done; |
fb2969a3 JH |
3793 | } |
3794 | ||
255047b0 MH |
3795 | rettime = ktime_get(); |
3796 | delta = ktime_sub(rettime, calltime); | |
3797 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
3798 | ||
5ced2464 | 3799 | BT_INFO("SMP test passed in %llu usecs", duration); |
0a2b0f04 | 3800 | |
64dd374e MH |
3801 | done: |
3802 | if (!err) | |
3803 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), | |
3804 | "PASS (%llu usecs)\n", duration); | |
3805 | else | |
3806 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n"); | |
3807 | ||
3808 | debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL, | |
3809 | &test_smp_fops); | |
3810 | ||
3811 | return err; | |
0a2b0f04 JH |
3812 | } |
3813 | ||
3814 | int __init bt_selftest_smp(void) | |
3815 | { | |
71af2f6b | 3816 | struct crypto_shash *tfm_cmac; |
47eb2ac8 | 3817 | struct crypto_kpp *tfm_ecdh; |
0a2b0f04 JH |
3818 | int err; |
3819 | ||
3d234b33 | 3820 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
0a2b0f04 JH |
3821 | if (IS_ERR(tfm_cmac)) { |
3822 | BT_ERR("Unable to create CMAC crypto context"); | |
0a2b0f04 JH |
3823 | return PTR_ERR(tfm_cmac); |
3824 | } | |
3825 | ||
6763f5ea | 3826 | tfm_ecdh = crypto_alloc_kpp("ecdh-nist-p256", 0, 0); |
47eb2ac8 TA |
3827 | if (IS_ERR(tfm_ecdh)) { |
3828 | BT_ERR("Unable to create ECDH crypto context"); | |
3829 | crypto_free_shash(tfm_cmac); | |
47eb2ac8 TA |
3830 | return PTR_ERR(tfm_ecdh); |
3831 | } | |
3832 | ||
28a220aa | 3833 | err = run_selftests(tfm_cmac, tfm_ecdh); |
0a2b0f04 | 3834 | |
71af2f6b | 3835 | crypto_free_shash(tfm_cmac); |
47eb2ac8 | 3836 | crypto_free_kpp(tfm_ecdh); |
0a2b0f04 JH |
3837 | |
3838 | return err; | |
3839 | } | |
3840 | ||
3841 | #endif |