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