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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
300acfde | 23 | #include <linux/debugfs.h> |
8c520a59 | 24 | #include <linux/scatterlist.h> |
a4770e11 | 25 | #include <linux/crypto.h> |
329d8230 | 26 | #include <crypto/algapi.h> |
8c520a59 | 27 | #include <crypto/b128ops.h> |
71af2f6b | 28 | #include <crypto/hash.h> |
47eb2ac8 | 29 | #include <crypto/kpp.h> |
8c520a59 | 30 | |
eb492e01 AB |
31 | #include <net/bluetooth/bluetooth.h> |
32 | #include <net/bluetooth/hci_core.h> | |
33 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 34 | #include <net/bluetooth/mgmt.h> |
ac4b7236 | 35 | |
58771c1c | 36 | #include "ecdh_helper.h" |
ac4b7236 | 37 | #include "smp.h" |
d22ef0bc | 38 | |
2fd36558 JH |
39 | #define SMP_DEV(hdev) \ |
40 | ((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data) | |
41 | ||
c7a3d57d JH |
42 | /* Low-level debug macros to be used for stuff that we don't want |
43 | * accidentially in dmesg, i.e. the values of the various crypto keys | |
44 | * and the inputs & outputs of crypto functions. | |
45 | */ | |
46 | #ifdef DEBUG | |
47 | #define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
48 | ##__VA_ARGS__) | |
49 | #else | |
50 | #define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
51 | ##__VA_ARGS__) | |
52 | #endif | |
53 | ||
b28b4943 | 54 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 55 | |
3b19146d JH |
56 | /* Keys which are not distributed with Secure Connections */ |
57 | #define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY); | |
58 | ||
17b02e62 | 59 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 60 | |
d7a5a11d | 61 | #define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \ |
a62da6f1 | 62 | 0x3f : 0x07) |
0edb14de | 63 | #define KEY_DIST_MASK 0x07 |
065a13e2 | 64 | |
cbbbe3e2 JH |
65 | /* Maximum message length that can be passed to aes_cmac */ |
66 | #define CMAC_MSG_MAX 80 | |
67 | ||
533e35d4 JH |
68 | enum { |
69 | SMP_FLAG_TK_VALID, | |
70 | SMP_FLAG_CFM_PENDING, | |
71 | SMP_FLAG_MITM_AUTH, | |
72 | SMP_FLAG_COMPLETE, | |
73 | SMP_FLAG_INITIATOR, | |
65668776 | 74 | SMP_FLAG_SC, |
d8f8edbe | 75 | SMP_FLAG_REMOTE_PK, |
aeb7d461 | 76 | SMP_FLAG_DEBUG_KEY, |
38606f14 | 77 | SMP_FLAG_WAIT_USER, |
d3e54a87 | 78 | SMP_FLAG_DHKEY_PENDING, |
1a8bab4f JH |
79 | SMP_FLAG_REMOTE_OOB, |
80 | SMP_FLAG_LOCAL_OOB, | |
a62da6f1 | 81 | SMP_FLAG_CT2, |
533e35d4 | 82 | }; |
4bc58f51 | 83 | |
88a479d9 | 84 | struct smp_dev { |
60a27d65 | 85 | /* Secure Connections OOB data */ |
2059cce1 | 86 | bool local_oob; |
60a27d65 | 87 | u8 local_pk[64]; |
fb334fee | 88 | u8 local_rand[16]; |
60a27d65 MH |
89 | bool debug_key; |
90 | ||
a4770e11 | 91 | struct crypto_cipher *tfm_aes; |
71af2f6b | 92 | struct crypto_shash *tfm_cmac; |
47eb2ac8 | 93 | struct crypto_kpp *tfm_ecdh; |
88a479d9 MH |
94 | }; |
95 | ||
4bc58f51 | 96 | struct smp_chan { |
b68fda68 JH |
97 | struct l2cap_conn *conn; |
98 | struct delayed_work security_timer; | |
b28b4943 | 99 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 100 | |
4bc58f51 JH |
101 | u8 preq[7]; /* SMP Pairing Request */ |
102 | u8 prsp[7]; /* SMP Pairing Response */ | |
103 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
104 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
105 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
106 | u8 tk[16]; /* SMP Temporary Key */ | |
882fafad JH |
107 | u8 rr[16]; /* Remote OOB ra/rb value */ |
108 | u8 lr[16]; /* Local OOB ra/rb value */ | |
4bc58f51 JH |
109 | u8 enc_key_size; |
110 | u8 remote_key_dist; | |
111 | bdaddr_t id_addr; | |
112 | u8 id_addr_type; | |
113 | u8 irk[16]; | |
114 | struct smp_csrk *csrk; | |
115 | struct smp_csrk *slave_csrk; | |
116 | struct smp_ltk *ltk; | |
117 | struct smp_ltk *slave_ltk; | |
118 | struct smp_irk *remote_irk; | |
6a77083a | 119 | u8 *link_key; |
4a74d658 | 120 | unsigned long flags; |
783e0574 | 121 | u8 method; |
38606f14 | 122 | u8 passkey_round; |
6a7bd103 | 123 | |
3b19146d JH |
124 | /* Secure Connections variables */ |
125 | u8 local_pk[64]; | |
d8f8edbe JH |
126 | u8 remote_pk[64]; |
127 | u8 dhkey[32]; | |
760b018b | 128 | u8 mackey[16]; |
3b19146d | 129 | |
a4770e11 | 130 | struct crypto_cipher *tfm_aes; |
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]; | |
71af2f6b | 174 | SHASH_DESC_ON_STACK(desc, tfm); |
cbbbe3e2 JH |
175 | int err; |
176 | ||
177 | if (len > CMAC_MSG_MAX) | |
178 | return -EFBIG; | |
179 | ||
180 | if (!tfm) { | |
181 | BT_ERR("tfm %p", tfm); | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
71af2f6b HX |
185 | desc->tfm = tfm; |
186 | desc->flags = 0; | |
cbbbe3e2 JH |
187 | |
188 | /* Swap key and message from LSB to MSB */ | |
189 | swap_buf(k, tmp, 16); | |
190 | swap_buf(m, msg_msb, len); | |
191 | ||
c7a3d57d JH |
192 | SMP_DBG("msg (len %zu) %*phN", len, (int) len, m); |
193 | SMP_DBG("key %16phN", k); | |
cbbbe3e2 | 194 | |
71af2f6b | 195 | err = crypto_shash_setkey(tfm, tmp, 16); |
cbbbe3e2 JH |
196 | if (err) { |
197 | BT_ERR("cipher setkey failed: %d", err); | |
198 | return err; | |
199 | } | |
200 | ||
71af2f6b HX |
201 | err = crypto_shash_digest(desc, msg_msb, len, mac_msb); |
202 | shash_desc_zero(desc); | |
cbbbe3e2 | 203 | if (err) { |
71af2f6b | 204 | BT_ERR("Hash computation error %d", err); |
cbbbe3e2 JH |
205 | return err; |
206 | } | |
207 | ||
208 | swap_buf(mac_msb, mac, 16); | |
209 | ||
c7a3d57d | 210 | SMP_DBG("mac %16phN", mac); |
cbbbe3e2 JH |
211 | |
212 | return 0; | |
213 | } | |
214 | ||
71af2f6b HX |
215 | static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32], |
216 | const u8 v[32], const u8 x[16], u8 z, u8 res[16]) | |
cbbbe3e2 JH |
217 | { |
218 | u8 m[65]; | |
219 | int err; | |
220 | ||
c7a3d57d JH |
221 | SMP_DBG("u %32phN", u); |
222 | SMP_DBG("v %32phN", v); | |
223 | SMP_DBG("x %16phN z %02x", x, z); | |
cbbbe3e2 JH |
224 | |
225 | m[0] = z; | |
226 | memcpy(m + 1, v, 32); | |
227 | memcpy(m + 33, u, 32); | |
228 | ||
229 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), res); | |
230 | if (err) | |
231 | return err; | |
232 | ||
c7a3d57d | 233 | SMP_DBG("res %16phN", res); |
cbbbe3e2 JH |
234 | |
235 | return err; | |
236 | } | |
237 | ||
71af2f6b | 238 | static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32], |
4da50de8 JH |
239 | const u8 n1[16], const u8 n2[16], const u8 a1[7], |
240 | const u8 a2[7], u8 mackey[16], u8 ltk[16]) | |
760b018b JH |
241 | { |
242 | /* The btle, salt and length "magic" values are as defined in | |
243 | * the SMP section of the Bluetooth core specification. In ASCII | |
244 | * the btle value ends up being 'btle'. The salt is just a | |
245 | * random number whereas length is the value 256 in little | |
246 | * endian format. | |
247 | */ | |
248 | const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 }; | |
249 | const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60, | |
250 | 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c }; | |
251 | const u8 length[2] = { 0x00, 0x01 }; | |
252 | u8 m[53], t[16]; | |
253 | int err; | |
254 | ||
c7a3d57d JH |
255 | SMP_DBG("w %32phN", w); |
256 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
257 | SMP_DBG("a1 %7phN a2 %7phN", a1, a2); | |
760b018b JH |
258 | |
259 | err = aes_cmac(tfm_cmac, salt, w, 32, t); | |
260 | if (err) | |
261 | return err; | |
262 | ||
c7a3d57d | 263 | SMP_DBG("t %16phN", t); |
760b018b JH |
264 | |
265 | memcpy(m, length, 2); | |
266 | memcpy(m + 2, a2, 7); | |
267 | memcpy(m + 9, a1, 7); | |
268 | memcpy(m + 16, n2, 16); | |
269 | memcpy(m + 32, n1, 16); | |
270 | memcpy(m + 48, btle, 4); | |
271 | ||
272 | m[52] = 0; /* Counter */ | |
273 | ||
274 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey); | |
275 | if (err) | |
276 | return err; | |
277 | ||
c7a3d57d | 278 | SMP_DBG("mackey %16phN", mackey); |
760b018b JH |
279 | |
280 | m[52] = 1; /* Counter */ | |
281 | ||
282 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk); | |
283 | if (err) | |
284 | return err; | |
285 | ||
c7a3d57d | 286 | SMP_DBG("ltk %16phN", ltk); |
760b018b JH |
287 | |
288 | return 0; | |
289 | } | |
290 | ||
71af2f6b | 291 | static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16], |
4da50de8 | 292 | const u8 n1[16], const u8 n2[16], const u8 r[16], |
760b018b JH |
293 | const u8 io_cap[3], const u8 a1[7], const u8 a2[7], |
294 | u8 res[16]) | |
295 | { | |
296 | u8 m[65]; | |
297 | int err; | |
298 | ||
c7a3d57d JH |
299 | SMP_DBG("w %16phN", w); |
300 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
301 | SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2); | |
760b018b JH |
302 | |
303 | memcpy(m, a2, 7); | |
304 | memcpy(m + 7, a1, 7); | |
305 | memcpy(m + 14, io_cap, 3); | |
306 | memcpy(m + 17, r, 16); | |
307 | memcpy(m + 33, n2, 16); | |
308 | memcpy(m + 49, n1, 16); | |
309 | ||
310 | err = aes_cmac(tfm_cmac, w, m, sizeof(m), res); | |
311 | if (err) | |
312 | return err; | |
313 | ||
203de21b | 314 | SMP_DBG("res %16phN", res); |
760b018b JH |
315 | |
316 | return err; | |
317 | } | |
318 | ||
71af2f6b | 319 | static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32], |
191dc7fe JH |
320 | const u8 x[16], const u8 y[16], u32 *val) |
321 | { | |
322 | u8 m[80], tmp[16]; | |
323 | int err; | |
324 | ||
c7a3d57d JH |
325 | SMP_DBG("u %32phN", u); |
326 | SMP_DBG("v %32phN", v); | |
327 | SMP_DBG("x %16phN y %16phN", x, y); | |
191dc7fe JH |
328 | |
329 | memcpy(m, y, 16); | |
330 | memcpy(m + 16, v, 32); | |
331 | memcpy(m + 48, u, 32); | |
332 | ||
333 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp); | |
334 | if (err) | |
335 | return err; | |
336 | ||
337 | *val = get_unaligned_le32(tmp); | |
338 | *val %= 1000000; | |
339 | ||
c7a3d57d | 340 | SMP_DBG("val %06u", *val); |
191dc7fe JH |
341 | |
342 | return 0; | |
343 | } | |
344 | ||
71af2f6b | 345 | static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16], |
06edf8de JH |
346 | const u8 key_id[4], u8 res[16]) |
347 | { | |
348 | int err; | |
349 | ||
350 | SMP_DBG("w %16phN key_id %4phN", w, key_id); | |
351 | ||
352 | err = aes_cmac(tfm_cmac, w, key_id, 4, res); | |
353 | if (err) | |
354 | return err; | |
355 | ||
356 | SMP_DBG("res %16phN", res); | |
357 | ||
358 | return err; | |
359 | } | |
360 | ||
a62da6f1 JH |
361 | static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16], |
362 | const u8 salt[16], u8 res[16]) | |
363 | { | |
364 | int err; | |
365 | ||
366 | SMP_DBG("w %16phN salt %16phN", w, salt); | |
367 | ||
368 | err = aes_cmac(tfm_cmac, salt, w, 16, res); | |
369 | if (err) | |
370 | return err; | |
371 | ||
372 | SMP_DBG("res %16phN", res); | |
373 | ||
374 | return err; | |
375 | } | |
376 | ||
06edf8de JH |
377 | /* The following functions map to the legacy SMP crypto functions e, c1, |
378 | * s1 and ah. | |
379 | */ | |
380 | ||
a4770e11 | 381 | static int smp_e(struct crypto_cipher *tfm, const u8 *k, u8 *r) |
d22ef0bc | 382 | { |
943a732a | 383 | uint8_t tmp[16], data[16]; |
201a5929 | 384 | int err; |
d22ef0bc | 385 | |
011c391a JH |
386 | SMP_DBG("k %16phN r %16phN", k, r); |
387 | ||
7f376cd6 | 388 | if (!tfm) { |
d22ef0bc AB |
389 | BT_ERR("tfm %p", tfm); |
390 | return -EINVAL; | |
391 | } | |
392 | ||
943a732a | 393 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 394 | swap_buf(k, tmp, 16); |
943a732a | 395 | |
a4770e11 | 396 | err = crypto_cipher_setkey(tfm, tmp, 16); |
d22ef0bc AB |
397 | if (err) { |
398 | BT_ERR("cipher setkey failed: %d", err); | |
399 | return err; | |
400 | } | |
401 | ||
943a732a | 402 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 403 | swap_buf(r, data, 16); |
943a732a | 404 | |
a4770e11 | 405 | crypto_cipher_encrypt_one(tfm, data, data); |
d22ef0bc | 406 | |
943a732a | 407 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 408 | swap_buf(data, r, 16); |
943a732a | 409 | |
011c391a JH |
410 | SMP_DBG("r %16phN", r); |
411 | ||
d22ef0bc AB |
412 | return err; |
413 | } | |
414 | ||
a4770e11 | 415 | static int smp_c1(struct crypto_cipher *tfm_aes, const u8 k[16], |
06edf8de JH |
416 | const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat, |
417 | const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16]) | |
6a77083a | 418 | { |
06edf8de | 419 | u8 p1[16], p2[16]; |
6a77083a JH |
420 | int err; |
421 | ||
011c391a JH |
422 | SMP_DBG("k %16phN r %16phN", k, r); |
423 | SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra); | |
424 | SMP_DBG("preq %7phN pres %7phN", preq, pres); | |
425 | ||
06edf8de | 426 | memset(p1, 0, 16); |
6a77083a | 427 | |
06edf8de JH |
428 | /* p1 = pres || preq || _rat || _iat */ |
429 | p1[0] = _iat; | |
430 | p1[1] = _rat; | |
431 | memcpy(p1 + 2, preq, 7); | |
432 | memcpy(p1 + 9, pres, 7); | |
433 | ||
011c391a | 434 | SMP_DBG("p1 %16phN", p1); |
06edf8de JH |
435 | |
436 | /* res = r XOR p1 */ | |
437 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
438 | ||
439 | /* res = e(k, res) */ | |
440 | err = smp_e(tfm_aes, k, res); | |
441 | if (err) { | |
442 | BT_ERR("Encrypt data error"); | |
6a77083a | 443 | return err; |
06edf8de | 444 | } |
6a77083a | 445 | |
011c391a JH |
446 | /* p2 = padding || ia || ra */ |
447 | memcpy(p2, ra, 6); | |
448 | memcpy(p2 + 6, ia, 6); | |
449 | memset(p2 + 12, 0, 4); | |
450 | ||
451 | SMP_DBG("p2 %16phN", p2); | |
452 | ||
06edf8de JH |
453 | /* res = res XOR p2 */ |
454 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
455 | ||
456 | /* res = e(k, res) */ | |
457 | err = smp_e(tfm_aes, k, res); | |
458 | if (err) | |
459 | BT_ERR("Encrypt data error"); | |
460 | ||
461 | return err; | |
462 | } | |
463 | ||
a4770e11 | 464 | static int smp_s1(struct crypto_cipher *tfm_aes, const u8 k[16], |
06edf8de JH |
465 | const u8 r1[16], const u8 r2[16], u8 _r[16]) |
466 | { | |
467 | int err; | |
468 | ||
469 | /* Just least significant octets from r1 and r2 are considered */ | |
470 | memcpy(_r, r2, 8); | |
471 | memcpy(_r + 8, r1, 8); | |
472 | ||
473 | err = smp_e(tfm_aes, k, _r); | |
474 | if (err) | |
475 | BT_ERR("Encrypt data error"); | |
6a77083a JH |
476 | |
477 | return err; | |
478 | } | |
479 | ||
a4770e11 | 480 | static int smp_ah(struct crypto_cipher *tfm, const u8 irk[16], |
cd082797 | 481 | const u8 r[3], u8 res[3]) |
60478054 | 482 | { |
943a732a | 483 | u8 _res[16]; |
60478054 JH |
484 | int err; |
485 | ||
486 | /* r' = padding || r */ | |
943a732a JH |
487 | memcpy(_res, r, 3); |
488 | memset(_res + 3, 0, 13); | |
60478054 | 489 | |
943a732a | 490 | err = smp_e(tfm, irk, _res); |
60478054 JH |
491 | if (err) { |
492 | BT_ERR("Encrypt error"); | |
493 | return err; | |
494 | } | |
495 | ||
496 | /* The output of the random address function ah is: | |
c5080d42 | 497 | * ah(k, r) = e(k, r') mod 2^24 |
60478054 JH |
498 | * The output of the security function e is then truncated to 24 bits |
499 | * by taking the least significant 24 bits of the output of e as the | |
500 | * result of ah. | |
501 | */ | |
943a732a | 502 | memcpy(res, _res, 3); |
60478054 JH |
503 | |
504 | return 0; | |
505 | } | |
506 | ||
cd082797 JH |
507 | bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], |
508 | const bdaddr_t *bdaddr) | |
60478054 | 509 | { |
defce9e8 | 510 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 511 | struct smp_dev *smp; |
60478054 JH |
512 | u8 hash[3]; |
513 | int err; | |
514 | ||
defce9e8 JH |
515 | if (!chan || !chan->data) |
516 | return false; | |
517 | ||
88a479d9 | 518 | smp = chan->data; |
defce9e8 | 519 | |
60478054 JH |
520 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
521 | ||
88a479d9 | 522 | err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash); |
60478054 JH |
523 | if (err) |
524 | return false; | |
525 | ||
329d8230 | 526 | return !crypto_memneq(bdaddr->b, hash, 3); |
60478054 JH |
527 | } |
528 | ||
cd082797 | 529 | int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 530 | { |
defce9e8 | 531 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 532 | struct smp_dev *smp; |
b1e2b3ae JH |
533 | int err; |
534 | ||
defce9e8 JH |
535 | if (!chan || !chan->data) |
536 | return -EOPNOTSUPP; | |
537 | ||
88a479d9 | 538 | smp = chan->data; |
defce9e8 | 539 | |
b1e2b3ae JH |
540 | get_random_bytes(&rpa->b[3], 3); |
541 | ||
542 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
543 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
544 | ||
88a479d9 | 545 | err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b); |
b1e2b3ae JH |
546 | if (err < 0) |
547 | return err; | |
548 | ||
549 | BT_DBG("RPA %pMR", rpa); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
60a27d65 MH |
554 | int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]) |
555 | { | |
556 | struct l2cap_chan *chan = hdev->smp_data; | |
557 | struct smp_dev *smp; | |
558 | int err; | |
559 | ||
560 | if (!chan || !chan->data) | |
561 | return -EOPNOTSUPP; | |
562 | ||
563 | smp = chan->data; | |
564 | ||
565 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { | |
566 | BT_DBG("Using debug keys"); | |
c0153b0b TA |
567 | err = set_ecdh_privkey(smp->tfm_ecdh, debug_sk); |
568 | if (err) | |
569 | return err; | |
60a27d65 | 570 | memcpy(smp->local_pk, debug_pk, 64); |
60a27d65 MH |
571 | smp->debug_key = true; |
572 | } else { | |
573 | while (true) { | |
c0153b0b TA |
574 | /* Generate key pair for Secure Connections */ |
575 | err = generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk); | |
a2976416 TA |
576 | if (err) |
577 | return err; | |
60a27d65 MH |
578 | |
579 | /* This is unlikely, but we need to check that | |
580 | * we didn't accidentially generate a debug key. | |
581 | */ | |
c0153b0b | 582 | if (crypto_memneq(smp->local_pk, debug_pk, 64)) |
60a27d65 MH |
583 | break; |
584 | } | |
585 | smp->debug_key = false; | |
586 | } | |
587 | ||
588 | SMP_DBG("OOB Public Key X: %32phN", smp->local_pk); | |
589 | SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32); | |
60a27d65 | 590 | |
fb334fee | 591 | get_random_bytes(smp->local_rand, 16); |
60a27d65 MH |
592 | |
593 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk, | |
fb334fee | 594 | smp->local_rand, 0, hash); |
60a27d65 MH |
595 | if (err < 0) |
596 | return err; | |
597 | ||
fb334fee | 598 | memcpy(rand, smp->local_rand, 16); |
60a27d65 | 599 | |
2059cce1 JH |
600 | smp->local_oob = true; |
601 | ||
60a27d65 MH |
602 | return 0; |
603 | } | |
604 | ||
5d88cc73 | 605 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 606 | { |
5d88cc73 | 607 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 608 | struct smp_chan *smp; |
5d88cc73 JH |
609 | struct kvec iv[2]; |
610 | struct msghdr msg; | |
eb492e01 | 611 | |
5d88cc73 JH |
612 | if (!chan) |
613 | return; | |
eb492e01 | 614 | |
5d88cc73 | 615 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 616 | |
5d88cc73 JH |
617 | iv[0].iov_base = &code; |
618 | iv[0].iov_len = 1; | |
eb492e01 | 619 | |
5d88cc73 JH |
620 | iv[1].iov_base = data; |
621 | iv[1].iov_len = len; | |
eb492e01 | 622 | |
5d88cc73 | 623 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 624 | |
17836394 | 625 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len); |
eb492e01 | 626 | |
5d88cc73 | 627 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 628 | |
b68fda68 JH |
629 | if (!chan->data) |
630 | return; | |
631 | ||
632 | smp = chan->data; | |
633 | ||
634 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 635 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
636 | } |
637 | ||
d2eb9e10 | 638 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 639 | { |
d2eb9e10 JH |
640 | if (authreq & SMP_AUTH_MITM) { |
641 | if (authreq & SMP_AUTH_SC) | |
642 | return BT_SECURITY_FIPS; | |
643 | else | |
644 | return BT_SECURITY_HIGH; | |
645 | } else { | |
2b64d153 | 646 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 647 | } |
2b64d153 BG |
648 | } |
649 | ||
650 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
651 | { | |
652 | switch (sec_level) { | |
d2eb9e10 | 653 | case BT_SECURITY_FIPS: |
2b64d153 BG |
654 | case BT_SECURITY_HIGH: |
655 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
656 | case BT_SECURITY_MEDIUM: | |
657 | return SMP_AUTH_BONDING; | |
658 | default: | |
659 | return SMP_AUTH_NONE; | |
660 | } | |
661 | } | |
662 | ||
b8e66eac | 663 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
664 | struct smp_cmd_pairing *req, |
665 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 666 | { |
5d88cc73 JH |
667 | struct l2cap_chan *chan = conn->smp; |
668 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
669 | struct hci_conn *hcon = conn->hcon; |
670 | struct hci_dev *hdev = hcon->hdev; | |
02b05bd8 | 671 | u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT; |
54790f73 | 672 | |
d7a5a11d | 673 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
7ee4ea36 MH |
674 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
675 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 676 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
677 | } else { |
678 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
679 | } |
680 | ||
d7a5a11d | 681 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
fd349c02 JH |
682 | remote_dist |= SMP_DIST_ID_KEY; |
683 | ||
d7a5a11d | 684 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
863efaf2 JH |
685 | local_dist |= SMP_DIST_ID_KEY; |
686 | ||
d7a5a11d | 687 | if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) && |
02b05bd8 JH |
688 | (authreq & SMP_AUTH_SC)) { |
689 | struct oob_data *oob_data; | |
690 | u8 bdaddr_type; | |
691 | ||
d7a5a11d | 692 | if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) { |
df8e1a4c JH |
693 | local_dist |= SMP_DIST_LINK_KEY; |
694 | remote_dist |= SMP_DIST_LINK_KEY; | |
695 | } | |
02b05bd8 JH |
696 | |
697 | if (hcon->dst_type == ADDR_LE_DEV_PUBLIC) | |
698 | bdaddr_type = BDADDR_LE_PUBLIC; | |
699 | else | |
700 | bdaddr_type = BDADDR_LE_RANDOM; | |
701 | ||
702 | oob_data = hci_find_remote_oob_data(hdev, &hcon->dst, | |
703 | bdaddr_type); | |
4775a4ea | 704 | if (oob_data && oob_data->present) { |
1a8bab4f | 705 | set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags); |
02b05bd8 | 706 | oob_flag = SMP_OOB_PRESENT; |
a29b0733 | 707 | memcpy(smp->rr, oob_data->rand256, 16); |
02b05bd8 | 708 | memcpy(smp->pcnf, oob_data->hash256, 16); |
bc07cd69 MH |
709 | SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf); |
710 | SMP_DBG("OOB Remote Random: %16phN", smp->rr); | |
02b05bd8 JH |
711 | } |
712 | ||
df8e1a4c JH |
713 | } else { |
714 | authreq &= ~SMP_AUTH_SC; | |
715 | } | |
716 | ||
54790f73 VCG |
717 | if (rsp == NULL) { |
718 | req->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 719 | req->oob_flag = oob_flag; |
84ebc60a | 720 | req->max_key_size = hdev->le_max_key_size; |
fd349c02 JH |
721 | req->init_key_dist = local_dist; |
722 | req->resp_key_dist = remote_dist; | |
0edb14de | 723 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
724 | |
725 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
726 | return; |
727 | } | |
728 | ||
729 | rsp->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 730 | rsp->oob_flag = oob_flag; |
84ebc60a | 731 | rsp->max_key_size = hdev->le_max_key_size; |
fd349c02 JH |
732 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
733 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 734 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
735 | |
736 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
737 | } |
738 | ||
3158c50c VCG |
739 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
740 | { | |
5d88cc73 | 741 | struct l2cap_chan *chan = conn->smp; |
2fd36558 | 742 | struct hci_dev *hdev = conn->hcon->hdev; |
5d88cc73 | 743 | struct smp_chan *smp = chan->data; |
1c1def09 | 744 | |
84ebc60a | 745 | if (max_key_size > hdev->le_max_key_size || |
2fd36558 | 746 | max_key_size < SMP_MIN_ENC_KEY_SIZE) |
3158c50c VCG |
747 | return SMP_ENC_KEY_SIZE; |
748 | ||
f7aa611a | 749 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
750 | |
751 | return 0; | |
752 | } | |
753 | ||
6f48e260 JH |
754 | static void smp_chan_destroy(struct l2cap_conn *conn) |
755 | { | |
756 | struct l2cap_chan *chan = conn->smp; | |
757 | struct smp_chan *smp = chan->data; | |
923e2414 | 758 | struct hci_conn *hcon = conn->hcon; |
6f48e260 JH |
759 | bool complete; |
760 | ||
761 | BUG_ON(!smp); | |
762 | ||
763 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 764 | |
6f48e260 | 765 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
923e2414 | 766 | mgmt_smp_complete(hcon, complete); |
6f48e260 | 767 | |
276812ec MH |
768 | kzfree(smp->csrk); |
769 | kzfree(smp->slave_csrk); | |
770 | kzfree(smp->link_key); | |
6f48e260 | 771 | |
a4770e11 | 772 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 773 | crypto_free_shash(smp->tfm_cmac); |
47eb2ac8 | 774 | crypto_free_kpp(smp->tfm_ecdh); |
6f48e260 | 775 | |
923e2414 JH |
776 | /* Ensure that we don't leave any debug key around if debug key |
777 | * support hasn't been explicitly enabled. | |
778 | */ | |
779 | if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG && | |
d7a5a11d | 780 | !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) { |
923e2414 JH |
781 | list_del_rcu(&smp->ltk->list); |
782 | kfree_rcu(smp->ltk, rcu); | |
783 | smp->ltk = NULL; | |
784 | } | |
785 | ||
6f48e260 JH |
786 | /* If pairing failed clean up any keys we might have */ |
787 | if (!complete) { | |
788 | if (smp->ltk) { | |
970d0f1b JH |
789 | list_del_rcu(&smp->ltk->list); |
790 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
791 | } |
792 | ||
793 | if (smp->slave_ltk) { | |
970d0f1b JH |
794 | list_del_rcu(&smp->slave_ltk->list); |
795 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
796 | } |
797 | ||
798 | if (smp->remote_irk) { | |
adae20cb JH |
799 | list_del_rcu(&smp->remote_irk->list); |
800 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
801 | } |
802 | } | |
803 | ||
804 | chan->data = NULL; | |
276812ec | 805 | kzfree(smp); |
923e2414 | 806 | hci_conn_drop(hcon); |
6f48e260 JH |
807 | } |
808 | ||
84794e11 | 809 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 810 | { |
bab73cb6 | 811 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 812 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 813 | |
84794e11 | 814 | if (reason) |
4f957a76 | 815 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 816 | &reason); |
4f957a76 | 817 | |
e1e930f5 | 818 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 819 | |
fc75cc86 | 820 | if (chan->data) |
f1c09c07 | 821 | smp_chan_destroy(conn); |
4f957a76 BG |
822 | } |
823 | ||
2b64d153 BG |
824 | #define JUST_WORKS 0x00 |
825 | #define JUST_CFM 0x01 | |
826 | #define REQ_PASSKEY 0x02 | |
827 | #define CFM_PASSKEY 0x03 | |
828 | #define REQ_OOB 0x04 | |
5e3d3d9b | 829 | #define DSP_PASSKEY 0x05 |
2b64d153 BG |
830 | #define OVERLAP 0xFF |
831 | ||
832 | static const u8 gen_method[5][5] = { | |
833 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
834 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
835 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
836 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
837 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
838 | }; | |
839 | ||
5e3d3d9b JH |
840 | static const u8 sc_method[5][5] = { |
841 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
842 | { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
843 | { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY }, | |
844 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
845 | { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
846 | }; | |
847 | ||
581370cc JH |
848 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
849 | { | |
2bcd4003 JH |
850 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
851 | * converted later to JUST_WORKS if we're initiators. | |
852 | */ | |
581370cc JH |
853 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
854 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 855 | return JUST_CFM; |
581370cc | 856 | |
5e3d3d9b JH |
857 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
858 | return sc_method[remote_io][local_io]; | |
859 | ||
581370cc JH |
860 | return gen_method[remote_io][local_io]; |
861 | } | |
862 | ||
2b64d153 BG |
863 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
864 | u8 local_io, u8 remote_io) | |
865 | { | |
866 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
867 | struct l2cap_chan *chan = conn->smp; |
868 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
869 | u32 passkey = 0; |
870 | int ret = 0; | |
871 | ||
872 | /* Initialize key for JUST WORKS */ | |
873 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 874 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
875 | |
876 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
877 | ||
2bcd4003 JH |
878 | /* If neither side wants MITM, either "just" confirm an incoming |
879 | * request or use just-works for outgoing ones. The JUST_CFM | |
880 | * will be converted to JUST_WORKS if necessary later in this | |
881 | * function. If either side has MITM look up the method from the | |
882 | * table. | |
883 | */ | |
581370cc | 884 | if (!(auth & SMP_AUTH_MITM)) |
783e0574 | 885 | smp->method = JUST_CFM; |
2b64d153 | 886 | else |
783e0574 | 887 | smp->method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 888 | |
a82505c7 | 889 | /* Don't confirm locally initiated pairing attempts */ |
783e0574 JH |
890 | if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, |
891 | &smp->flags)) | |
892 | smp->method = JUST_WORKS; | |
a82505c7 | 893 | |
02f3e254 | 894 | /* Don't bother user space with no IO capabilities */ |
783e0574 JH |
895 | if (smp->method == JUST_CFM && |
896 | hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
897 | smp->method = JUST_WORKS; | |
02f3e254 | 898 | |
2b64d153 | 899 | /* If Just Works, Continue with Zero TK */ |
783e0574 | 900 | if (smp->method == JUST_WORKS) { |
4a74d658 | 901 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
902 | return 0; |
903 | } | |
904 | ||
19c5ce9c JH |
905 | /* If this function is used for SC -> legacy fallback we |
906 | * can only recover the just-works case. | |
907 | */ | |
908 | if (test_bit(SMP_FLAG_SC, &smp->flags)) | |
909 | return -EINVAL; | |
910 | ||
2b64d153 | 911 | /* Not Just Works/Confirm results in MITM Authentication */ |
783e0574 | 912 | if (smp->method != JUST_CFM) { |
4a74d658 | 913 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
914 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
915 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
916 | } | |
2b64d153 BG |
917 | |
918 | /* If both devices have Keyoard-Display I/O, the master | |
919 | * Confirms and the slave Enters the passkey. | |
920 | */ | |
783e0574 | 921 | if (smp->method == OVERLAP) { |
40bef302 | 922 | if (hcon->role == HCI_ROLE_MASTER) |
783e0574 | 923 | smp->method = CFM_PASSKEY; |
2b64d153 | 924 | else |
783e0574 | 925 | smp->method = REQ_PASSKEY; |
2b64d153 BG |
926 | } |
927 | ||
01ad34d2 | 928 | /* Generate random passkey. */ |
783e0574 | 929 | if (smp->method == CFM_PASSKEY) { |
943a732a | 930 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
931 | get_random_bytes(&passkey, sizeof(passkey)); |
932 | passkey %= 1000000; | |
943a732a | 933 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 934 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 935 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
936 | } |
937 | ||
783e0574 | 938 | if (smp->method == REQ_PASSKEY) |
ce39fb4e | 939 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 940 | hcon->type, hcon->dst_type); |
783e0574 | 941 | else if (smp->method == JUST_CFM) |
4eb65e66 JH |
942 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
943 | hcon->type, hcon->dst_type, | |
944 | passkey, 1); | |
2b64d153 | 945 | else |
01ad34d2 | 946 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 947 | hcon->type, hcon->dst_type, |
39adbffe | 948 | passkey, 0); |
2b64d153 | 949 | |
2b64d153 BG |
950 | return ret; |
951 | } | |
952 | ||
1cc61144 | 953 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 954 | { |
8aab4757 | 955 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
956 | struct smp_cmd_pairing_confirm cp; |
957 | int ret; | |
8aab4757 VCG |
958 | |
959 | BT_DBG("conn %p", conn); | |
960 | ||
e491eaf3 | 961 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 962 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
963 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
964 | cp.confirm_val); | |
1cc61144 JH |
965 | if (ret) |
966 | return SMP_UNSPECIFIED; | |
8aab4757 | 967 | |
4a74d658 | 968 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 969 | |
8aab4757 VCG |
970 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
971 | ||
b28b4943 JH |
972 | if (conn->hcon->out) |
973 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
974 | else | |
975 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
976 | ||
1cc61144 | 977 | return 0; |
8aab4757 VCG |
978 | } |
979 | ||
861580a9 | 980 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 981 | { |
8aab4757 VCG |
982 | struct l2cap_conn *conn = smp->conn; |
983 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 984 | u8 confirm[16]; |
8aab4757 VCG |
985 | int ret; |
986 | ||
ec70f36f | 987 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 988 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
989 | |
990 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
991 | ||
e491eaf3 | 992 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 993 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 994 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
995 | if (ret) |
996 | return SMP_UNSPECIFIED; | |
8aab4757 | 997 | |
329d8230 | 998 | if (crypto_memneq(smp->pcnf, confirm, sizeof(smp->pcnf))) { |
2064ee33 MH |
999 | bt_dev_err(hcon->hdev, "pairing failed " |
1000 | "(confirmation values mismatch)"); | |
861580a9 | 1001 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
1002 | } |
1003 | ||
1004 | if (hcon->out) { | |
fe39c7b2 MH |
1005 | u8 stk[16]; |
1006 | __le64 rand = 0; | |
1007 | __le16 ediv = 0; | |
8aab4757 | 1008 | |
e491eaf3 | 1009 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 1010 | |
861580a9 JH |
1011 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
1012 | return SMP_UNSPECIFIED; | |
8aab4757 | 1013 | |
8b76ce34 | 1014 | hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size); |
f7aa611a | 1015 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 1016 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 1017 | } else { |
fff3490f | 1018 | u8 stk[16], auth; |
fe39c7b2 MH |
1019 | __le64 rand = 0; |
1020 | __le16 ediv = 0; | |
8aab4757 | 1021 | |
943a732a JH |
1022 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1023 | smp->prnd); | |
8aab4757 | 1024 | |
e491eaf3 | 1025 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 1026 | |
fff3490f JH |
1027 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
1028 | auth = 1; | |
1029 | else | |
1030 | auth = 0; | |
1031 | ||
7d5843b7 JH |
1032 | /* Even though there's no _SLAVE suffix this is the |
1033 | * slave STK we're adding for later lookup (the master | |
1034 | * STK never needs to be stored). | |
1035 | */ | |
ce39fb4e | 1036 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1037 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
1038 | } |
1039 | ||
861580a9 | 1040 | return 0; |
8aab4757 VCG |
1041 | } |
1042 | ||
44f1a7ab JH |
1043 | static void smp_notify_keys(struct l2cap_conn *conn) |
1044 | { | |
1045 | struct l2cap_chan *chan = conn->smp; | |
1046 | struct smp_chan *smp = chan->data; | |
1047 | struct hci_conn *hcon = conn->hcon; | |
1048 | struct hci_dev *hdev = hcon->hdev; | |
1049 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
1050 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1051 | bool persistent; | |
1052 | ||
cad20c27 JH |
1053 | if (hcon->type == ACL_LINK) { |
1054 | if (hcon->key_type == HCI_LK_DEBUG_COMBINATION) | |
1055 | persistent = false; | |
1056 | else | |
1057 | persistent = !test_bit(HCI_CONN_FLUSH_KEY, | |
1058 | &hcon->flags); | |
1059 | } else { | |
1060 | /* The LTKs, IRKs and CSRKs should be persistent only if | |
1061 | * both sides had the bonding bit set in their | |
1062 | * authentication requests. | |
1063 | */ | |
1064 | persistent = !!((req->auth_req & rsp->auth_req) & | |
1065 | SMP_AUTH_BONDING); | |
1066 | } | |
1067 | ||
44f1a7ab | 1068 | if (smp->remote_irk) { |
cad20c27 JH |
1069 | mgmt_new_irk(hdev, smp->remote_irk, persistent); |
1070 | ||
44f1a7ab JH |
1071 | /* Now that user space can be considered to know the |
1072 | * identity address track the connection based on it | |
b5ae344d | 1073 | * from now on (assuming this is an LE link). |
44f1a7ab | 1074 | */ |
b5ae344d JH |
1075 | if (hcon->type == LE_LINK) { |
1076 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1077 | hcon->dst_type = smp->remote_irk->addr_type; | |
1078 | queue_work(hdev->workqueue, &conn->id_addr_update_work); | |
1079 | } | |
44f1a7ab JH |
1080 | } |
1081 | ||
44f1a7ab JH |
1082 | if (smp->csrk) { |
1083 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1084 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
1085 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
1086 | } | |
1087 | ||
1088 | if (smp->slave_csrk) { | |
1089 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1090 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
1091 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
1092 | } | |
1093 | ||
1094 | if (smp->ltk) { | |
1095 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1096 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
1097 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
1098 | } | |
1099 | ||
1100 | if (smp->slave_ltk) { | |
1101 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1102 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
1103 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
1104 | } | |
6a77083a JH |
1105 | |
1106 | if (smp->link_key) { | |
e3befab9 JH |
1107 | struct link_key *key; |
1108 | u8 type; | |
1109 | ||
1110 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1111 | type = HCI_LK_DEBUG_COMBINATION; | |
1112 | else if (hcon->sec_level == BT_SECURITY_FIPS) | |
1113 | type = HCI_LK_AUTH_COMBINATION_P256; | |
1114 | else | |
1115 | type = HCI_LK_UNAUTH_COMBINATION_P256; | |
1116 | ||
1117 | key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst, | |
1118 | smp->link_key, type, 0, &persistent); | |
1119 | if (key) { | |
1120 | mgmt_new_link_key(hdev, key, persistent); | |
1121 | ||
1122 | /* Don't keep debug keys around if the relevant | |
1123 | * flag is not set. | |
1124 | */ | |
d7a5a11d | 1125 | if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) && |
e3befab9 JH |
1126 | key->type == HCI_LK_DEBUG_COMBINATION) { |
1127 | list_del_rcu(&key->list); | |
1128 | kfree_rcu(key, rcu); | |
1129 | } | |
1130 | } | |
6a77083a JH |
1131 | } |
1132 | } | |
1133 | ||
d3e54a87 JH |
1134 | static void sc_add_ltk(struct smp_chan *smp) |
1135 | { | |
1136 | struct hci_conn *hcon = smp->conn->hcon; | |
1137 | u8 key_type, auth; | |
1138 | ||
1139 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1140 | key_type = SMP_LTK_P256_DEBUG; | |
1141 | else | |
1142 | key_type = SMP_LTK_P256; | |
1143 | ||
1144 | if (hcon->pending_sec_level == BT_SECURITY_FIPS) | |
1145 | auth = 1; | |
1146 | else | |
1147 | auth = 0; | |
1148 | ||
d3e54a87 JH |
1149 | smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
1150 | key_type, auth, smp->tk, smp->enc_key_size, | |
1151 | 0, 0); | |
1152 | } | |
1153 | ||
6a77083a JH |
1154 | static void sc_generate_link_key(struct smp_chan *smp) |
1155 | { | |
a62da6f1 | 1156 | /* From core spec. Spells out in ASCII as 'lebr'. */ |
6a77083a JH |
1157 | const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c }; |
1158 | ||
1159 | smp->link_key = kzalloc(16, GFP_KERNEL); | |
1160 | if (!smp->link_key) | |
1161 | return; | |
1162 | ||
a62da6f1 JH |
1163 | if (test_bit(SMP_FLAG_CT2, &smp->flags)) { |
1164 | /* SALT = 0x00000000000000000000000000000000746D7031 */ | |
1165 | const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1166 | ||
1167 | if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) { | |
1168 | kzfree(smp->link_key); | |
1169 | smp->link_key = NULL; | |
1170 | return; | |
1171 | } | |
1172 | } else { | |
1173 | /* From core spec. Spells out in ASCII as 'tmp1'. */ | |
1174 | const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1175 | ||
1176 | if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) { | |
1177 | kzfree(smp->link_key); | |
1178 | smp->link_key = NULL; | |
1179 | return; | |
1180 | } | |
6a77083a JH |
1181 | } |
1182 | ||
1183 | if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) { | |
276812ec | 1184 | kzfree(smp->link_key); |
6a77083a JH |
1185 | smp->link_key = NULL; |
1186 | return; | |
1187 | } | |
44f1a7ab JH |
1188 | } |
1189 | ||
b28b4943 JH |
1190 | static void smp_allow_key_dist(struct smp_chan *smp) |
1191 | { | |
1192 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
1193 | * will be allowed in each PDU handler to ensure we receive | |
1194 | * them in the correct order. | |
1195 | */ | |
1196 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
1197 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
1198 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
1199 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
1200 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
1201 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1202 | } | |
1203 | ||
b5ae344d JH |
1204 | static void sc_generate_ltk(struct smp_chan *smp) |
1205 | { | |
a62da6f1 | 1206 | /* From core spec. Spells out in ASCII as 'brle'. */ |
b5ae344d JH |
1207 | const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 }; |
1208 | struct hci_conn *hcon = smp->conn->hcon; | |
1209 | struct hci_dev *hdev = hcon->hdev; | |
1210 | struct link_key *key; | |
1211 | ||
1212 | key = hci_find_link_key(hdev, &hcon->dst); | |
1213 | if (!key) { | |
2064ee33 | 1214 | bt_dev_err(hdev, "no Link Key found to generate LTK"); |
b5ae344d JH |
1215 | return; |
1216 | } | |
1217 | ||
1218 | if (key->type == HCI_LK_DEBUG_COMBINATION) | |
1219 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1220 | ||
a62da6f1 JH |
1221 | if (test_bit(SMP_FLAG_CT2, &smp->flags)) { |
1222 | /* SALT = 0x00000000000000000000000000000000746D7032 */ | |
1223 | const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1224 | ||
1225 | if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk)) | |
1226 | return; | |
1227 | } else { | |
1228 | /* From core spec. Spells out in ASCII as 'tmp2'. */ | |
1229 | const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1230 | ||
1231 | if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk)) | |
1232 | return; | |
1233 | } | |
b5ae344d JH |
1234 | |
1235 | if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk)) | |
1236 | return; | |
1237 | ||
1238 | sc_add_ltk(smp); | |
1239 | } | |
1240 | ||
d6268e86 | 1241 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
1242 | { |
1243 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 1244 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
1245 | struct hci_conn *hcon = conn->hcon; |
1246 | struct hci_dev *hdev = hcon->hdev; | |
1247 | __u8 *keydist; | |
1248 | ||
1249 | BT_DBG("conn %p", conn); | |
1250 | ||
44f1a7ab JH |
1251 | rsp = (void *) &smp->prsp[1]; |
1252 | ||
1253 | /* The responder sends its keys first */ | |
b28b4943 JH |
1254 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
1255 | smp_allow_key_dist(smp); | |
86d1407c | 1256 | return; |
b28b4943 | 1257 | } |
44f1a7ab JH |
1258 | |
1259 | req = (void *) &smp->preq[1]; | |
1260 | ||
1261 | if (hcon->out) { | |
1262 | keydist = &rsp->init_key_dist; | |
1263 | *keydist &= req->init_key_dist; | |
1264 | } else { | |
1265 | keydist = &rsp->resp_key_dist; | |
1266 | *keydist &= req->resp_key_dist; | |
1267 | } | |
1268 | ||
6a77083a | 1269 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
b5ae344d | 1270 | if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY)) |
6a77083a | 1271 | sc_generate_link_key(smp); |
b5ae344d JH |
1272 | if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY)) |
1273 | sc_generate_ltk(smp); | |
6a77083a JH |
1274 | |
1275 | /* Clear the keys which are generated but not distributed */ | |
1276 | *keydist &= ~SMP_SC_NO_DIST; | |
1277 | } | |
1278 | ||
44f1a7ab JH |
1279 | BT_DBG("keydist 0x%x", *keydist); |
1280 | ||
1281 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1282 | struct smp_cmd_encrypt_info enc; | |
1283 | struct smp_cmd_master_ident ident; | |
1284 | struct smp_ltk *ltk; | |
1285 | u8 authenticated; | |
1286 | __le16 ediv; | |
1287 | __le64 rand; | |
1288 | ||
1fc62c52 JH |
1289 | /* Make sure we generate only the significant amount of |
1290 | * bytes based on the encryption key size, and set the rest | |
1291 | * of the value to zeroes. | |
1292 | */ | |
1293 | get_random_bytes(enc.ltk, smp->enc_key_size); | |
1294 | memset(enc.ltk + smp->enc_key_size, 0, | |
1295 | sizeof(enc.ltk) - smp->enc_key_size); | |
1296 | ||
44f1a7ab JH |
1297 | get_random_bytes(&ediv, sizeof(ediv)); |
1298 | get_random_bytes(&rand, sizeof(rand)); | |
1299 | ||
1300 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1301 | ||
1302 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
1303 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
1304 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
1305 | smp->enc_key_size, ediv, rand); | |
1306 | smp->slave_ltk = ltk; | |
1307 | ||
1308 | ident.ediv = ediv; | |
1309 | ident.rand = rand; | |
1310 | ||
1311 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1312 | ||
1313 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1314 | } | |
1315 | ||
1316 | if (*keydist & SMP_DIST_ID_KEY) { | |
1317 | struct smp_cmd_ident_addr_info addrinfo; | |
1318 | struct smp_cmd_ident_info idinfo; | |
1319 | ||
1320 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
1321 | ||
1322 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1323 | ||
1324 | /* The hci_conn contains the local identity address | |
1325 | * after the connection has been established. | |
1326 | * | |
1327 | * This is true even when the connection has been | |
1328 | * established using a resolvable random address. | |
1329 | */ | |
1330 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
1331 | addrinfo.addr_type = hcon->src_type; | |
1332 | ||
1333 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1334 | &addrinfo); | |
1335 | ||
1336 | *keydist &= ~SMP_DIST_ID_KEY; | |
1337 | } | |
1338 | ||
1339 | if (*keydist & SMP_DIST_SIGN) { | |
1340 | struct smp_cmd_sign_info sign; | |
1341 | struct smp_csrk *csrk; | |
1342 | ||
1343 | /* Generate a new random key */ | |
1344 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1345 | ||
1346 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1347 | if (csrk) { | |
4cd3928a JH |
1348 | if (hcon->sec_level > BT_SECURITY_MEDIUM) |
1349 | csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED; | |
1350 | else | |
1351 | csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED; | |
44f1a7ab JH |
1352 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); |
1353 | } | |
1354 | smp->slave_csrk = csrk; | |
1355 | ||
1356 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1357 | ||
1358 | *keydist &= ~SMP_DIST_SIGN; | |
1359 | } | |
1360 | ||
1361 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
1362 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
1363 | smp_allow_key_dist(smp); | |
86d1407c | 1364 | return; |
b28b4943 | 1365 | } |
44f1a7ab | 1366 | |
44f1a7ab JH |
1367 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1368 | smp_notify_keys(conn); | |
1369 | ||
1370 | smp_chan_destroy(conn); | |
44f1a7ab JH |
1371 | } |
1372 | ||
b68fda68 JH |
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 | ||
1379 | BT_DBG("conn %p", conn); | |
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 | { | |
5d88cc73 | 1386 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
1387 | struct smp_chan *smp; |
1388 | ||
f1560463 | 1389 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 1390 | if (!smp) |
8aab4757 VCG |
1391 | return NULL; |
1392 | ||
a4770e11 | 1393 | smp->tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
6a7bd103 | 1394 | if (IS_ERR(smp->tfm_aes)) { |
a4770e11 | 1395 | BT_ERR("Unable to create AES crypto context"); |
47eb2ac8 | 1396 | goto zfree_smp; |
6a7bd103 JH |
1397 | } |
1398 | ||
71af2f6b | 1399 | smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
407cecf6 JH |
1400 | if (IS_ERR(smp->tfm_cmac)) { |
1401 | BT_ERR("Unable to create CMAC crypto context"); | |
47eb2ac8 TA |
1402 | goto free_cipher; |
1403 | } | |
1404 | ||
1405 | smp->tfm_ecdh = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0); | |
1406 | if (IS_ERR(smp->tfm_ecdh)) { | |
1407 | BT_ERR("Unable to create ECDH crypto context"); | |
1408 | goto free_shash; | |
407cecf6 JH |
1409 | } |
1410 | ||
8aab4757 | 1411 | smp->conn = conn; |
5d88cc73 | 1412 | chan->data = smp; |
8aab4757 | 1413 | |
b28b4943 JH |
1414 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
1415 | ||
b68fda68 JH |
1416 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
1417 | ||
8aab4757 VCG |
1418 | hci_conn_hold(conn->hcon); |
1419 | ||
1420 | return smp; | |
47eb2ac8 TA |
1421 | |
1422 | free_shash: | |
1423 | crypto_free_shash(smp->tfm_cmac); | |
1424 | free_cipher: | |
1425 | crypto_free_cipher(smp->tfm_aes); | |
1426 | zfree_smp: | |
1427 | kzfree(smp); | |
1428 | return NULL; | |
8aab4757 VCG |
1429 | } |
1430 | ||
760b018b JH |
1431 | static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16]) |
1432 | { | |
1433 | struct hci_conn *hcon = smp->conn->hcon; | |
1434 | u8 *na, *nb, a[7], b[7]; | |
1435 | ||
1436 | if (hcon->out) { | |
1437 | na = smp->prnd; | |
1438 | nb = smp->rrnd; | |
1439 | } else { | |
1440 | na = smp->rrnd; | |
1441 | nb = smp->prnd; | |
1442 | } | |
1443 | ||
1444 | memcpy(a, &hcon->init_addr, 6); | |
1445 | memcpy(b, &hcon->resp_addr, 6); | |
1446 | a[6] = hcon->init_addr_type; | |
1447 | b[6] = hcon->resp_addr_type; | |
1448 | ||
1449 | return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk); | |
1450 | } | |
1451 | ||
38606f14 | 1452 | static void sc_dhkey_check(struct smp_chan *smp) |
760b018b JH |
1453 | { |
1454 | struct hci_conn *hcon = smp->conn->hcon; | |
1455 | struct smp_cmd_dhkey_check check; | |
1456 | u8 a[7], b[7], *local_addr, *remote_addr; | |
1457 | u8 io_cap[3], r[16]; | |
1458 | ||
760b018b JH |
1459 | memcpy(a, &hcon->init_addr, 6); |
1460 | memcpy(b, &hcon->resp_addr, 6); | |
1461 | a[6] = hcon->init_addr_type; | |
1462 | b[6] = hcon->resp_addr_type; | |
1463 | ||
1464 | if (hcon->out) { | |
1465 | local_addr = a; | |
1466 | remote_addr = b; | |
1467 | memcpy(io_cap, &smp->preq[1], 3); | |
1468 | } else { | |
1469 | local_addr = b; | |
1470 | remote_addr = a; | |
1471 | memcpy(io_cap, &smp->prsp[1], 3); | |
1472 | } | |
1473 | ||
dddd3059 JH |
1474 | memset(r, 0, sizeof(r)); |
1475 | ||
1476 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
38606f14 | 1477 | put_unaligned_le32(hcon->passkey_notify, r); |
760b018b | 1478 | |
a29b0733 JH |
1479 | if (smp->method == REQ_OOB) |
1480 | memcpy(r, smp->rr, 16); | |
1481 | ||
760b018b JH |
1482 | smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap, |
1483 | local_addr, remote_addr, check.e); | |
1484 | ||
1485 | smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check); | |
dddd3059 JH |
1486 | } |
1487 | ||
38606f14 JH |
1488 | static u8 sc_passkey_send_confirm(struct smp_chan *smp) |
1489 | { | |
1490 | struct l2cap_conn *conn = smp->conn; | |
1491 | struct hci_conn *hcon = conn->hcon; | |
1492 | struct smp_cmd_pairing_confirm cfm; | |
1493 | u8 r; | |
1494 | ||
1495 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1496 | r |= 0x80; | |
1497 | ||
1498 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); | |
1499 | ||
1500 | if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r, | |
1501 | cfm.confirm_val)) | |
1502 | return SMP_UNSPECIFIED; | |
1503 | ||
1504 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
1505 | ||
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op) | |
1510 | { | |
1511 | struct l2cap_conn *conn = smp->conn; | |
1512 | struct hci_conn *hcon = conn->hcon; | |
1513 | struct hci_dev *hdev = hcon->hdev; | |
1514 | u8 cfm[16], r; | |
1515 | ||
1516 | /* Ignore the PDU if we've already done 20 rounds (0 - 19) */ | |
1517 | if (smp->passkey_round >= 20) | |
1518 | return 0; | |
1519 | ||
1520 | switch (smp_op) { | |
1521 | case SMP_CMD_PAIRING_RANDOM: | |
1522 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1523 | r |= 0x80; | |
1524 | ||
1525 | if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1526 | smp->rrnd, r, cfm)) | |
1527 | return SMP_UNSPECIFIED; | |
1528 | ||
329d8230 | 1529 | if (crypto_memneq(smp->pcnf, cfm, 16)) |
38606f14 JH |
1530 | return SMP_CONFIRM_FAILED; |
1531 | ||
1532 | smp->passkey_round++; | |
1533 | ||
1534 | if (smp->passkey_round == 20) { | |
1535 | /* Generate MacKey and LTK */ | |
1536 | if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk)) | |
1537 | return SMP_UNSPECIFIED; | |
1538 | } | |
1539 | ||
1540 | /* The round is only complete when the initiator | |
1541 | * receives pairing random. | |
1542 | */ | |
1543 | if (!hcon->out) { | |
1544 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1545 | sizeof(smp->prnd), smp->prnd); | |
d3e54a87 | 1546 | if (smp->passkey_round == 20) |
38606f14 | 1547 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
d3e54a87 | 1548 | else |
38606f14 | 1549 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
38606f14 JH |
1550 | return 0; |
1551 | } | |
1552 | ||
1553 | /* Start the next round */ | |
1554 | if (smp->passkey_round != 20) | |
1555 | return sc_passkey_round(smp, 0); | |
1556 | ||
1557 | /* Passkey rounds are complete - start DHKey Check */ | |
1558 | sc_dhkey_check(smp); | |
1559 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1560 | ||
1561 | break; | |
1562 | ||
1563 | case SMP_CMD_PAIRING_CONFIRM: | |
1564 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
1565 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1570 | ||
1571 | if (hcon->out) { | |
1572 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1573 | sizeof(smp->prnd), smp->prnd); | |
1574 | return 0; | |
1575 | } | |
1576 | ||
1577 | return sc_passkey_send_confirm(smp); | |
1578 | ||
1579 | case SMP_CMD_PUBLIC_KEY: | |
1580 | default: | |
1581 | /* Initiating device starts the round */ | |
1582 | if (!hcon->out) | |
1583 | return 0; | |
1584 | ||
1585 | BT_DBG("%s Starting passkey round %u", hdev->name, | |
1586 | smp->passkey_round + 1); | |
1587 | ||
1588 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1589 | ||
1590 | return sc_passkey_send_confirm(smp); | |
1591 | } | |
1592 | ||
1593 | return 0; | |
1594 | } | |
1595 | ||
dddd3059 JH |
1596 | static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey) |
1597 | { | |
38606f14 JH |
1598 | struct l2cap_conn *conn = smp->conn; |
1599 | struct hci_conn *hcon = conn->hcon; | |
1600 | u8 smp_op; | |
1601 | ||
1602 | clear_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
1603 | ||
dddd3059 JH |
1604 | switch (mgmt_op) { |
1605 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1606 | smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED); | |
1607 | return 0; | |
1608 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
1609 | smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED); | |
1610 | return 0; | |
38606f14 JH |
1611 | case MGMT_OP_USER_PASSKEY_REPLY: |
1612 | hcon->passkey_notify = le32_to_cpu(passkey); | |
1613 | smp->passkey_round = 0; | |
1614 | ||
1615 | if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) | |
1616 | smp_op = SMP_CMD_PAIRING_CONFIRM; | |
1617 | else | |
1618 | smp_op = 0; | |
1619 | ||
1620 | if (sc_passkey_round(smp, smp_op)) | |
1621 | return -EIO; | |
1622 | ||
1623 | return 0; | |
dddd3059 JH |
1624 | } |
1625 | ||
d3e54a87 JH |
1626 | /* Initiator sends DHKey check first */ |
1627 | if (hcon->out) { | |
1628 | sc_dhkey_check(smp); | |
1629 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1630 | } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) { | |
1631 | sc_dhkey_check(smp); | |
1632 | sc_add_ltk(smp); | |
1633 | } | |
760b018b JH |
1634 | |
1635 | return 0; | |
1636 | } | |
1637 | ||
2b64d153 BG |
1638 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
1639 | { | |
b10e8017 | 1640 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 1641 | struct l2cap_chan *chan; |
2b64d153 BG |
1642 | struct smp_chan *smp; |
1643 | u32 value; | |
fc75cc86 | 1644 | int err; |
2b64d153 BG |
1645 | |
1646 | BT_DBG(""); | |
1647 | ||
fc75cc86 | 1648 | if (!conn) |
2b64d153 BG |
1649 | return -ENOTCONN; |
1650 | ||
5d88cc73 JH |
1651 | chan = conn->smp; |
1652 | if (!chan) | |
1653 | return -ENOTCONN; | |
1654 | ||
fc75cc86 JH |
1655 | l2cap_chan_lock(chan); |
1656 | if (!chan->data) { | |
1657 | err = -ENOTCONN; | |
1658 | goto unlock; | |
1659 | } | |
1660 | ||
5d88cc73 | 1661 | smp = chan->data; |
2b64d153 | 1662 | |
760b018b JH |
1663 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1664 | err = sc_user_reply(smp, mgmt_op, passkey); | |
1665 | goto unlock; | |
1666 | } | |
1667 | ||
2b64d153 BG |
1668 | switch (mgmt_op) { |
1669 | case MGMT_OP_USER_PASSKEY_REPLY: | |
1670 | value = le32_to_cpu(passkey); | |
943a732a | 1671 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 1672 | BT_DBG("PassKey: %d", value); |
943a732a | 1673 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
1674 | /* Fall Through */ |
1675 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 1676 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
1677 | break; |
1678 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1679 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 1680 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1681 | err = 0; |
1682 | goto unlock; | |
2b64d153 | 1683 | default: |
84794e11 | 1684 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1685 | err = -EOPNOTSUPP; |
1686 | goto unlock; | |
2b64d153 BG |
1687 | } |
1688 | ||
fc75cc86 JH |
1689 | err = 0; |
1690 | ||
2b64d153 | 1691 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
1692 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
1693 | u8 rsp = smp_confirm(smp); | |
1694 | if (rsp) | |
1695 | smp_failure(conn, rsp); | |
1696 | } | |
2b64d153 | 1697 | |
fc75cc86 JH |
1698 | unlock: |
1699 | l2cap_chan_unlock(chan); | |
1700 | return err; | |
2b64d153 BG |
1701 | } |
1702 | ||
b5ae344d JH |
1703 | static void build_bredr_pairing_cmd(struct smp_chan *smp, |
1704 | struct smp_cmd_pairing *req, | |
1705 | struct smp_cmd_pairing *rsp) | |
1706 | { | |
1707 | struct l2cap_conn *conn = smp->conn; | |
1708 | struct hci_dev *hdev = conn->hcon->hdev; | |
1709 | u8 local_dist = 0, remote_dist = 0; | |
1710 | ||
d7a5a11d | 1711 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
b5ae344d JH |
1712 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
1713 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1714 | } | |
1715 | ||
d7a5a11d | 1716 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
b5ae344d JH |
1717 | remote_dist |= SMP_DIST_ID_KEY; |
1718 | ||
d7a5a11d | 1719 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
b5ae344d JH |
1720 | local_dist |= SMP_DIST_ID_KEY; |
1721 | ||
1722 | if (!rsp) { | |
1723 | memset(req, 0, sizeof(*req)); | |
1724 | ||
a62da6f1 | 1725 | req->auth_req = SMP_AUTH_CT2; |
b5ae344d JH |
1726 | req->init_key_dist = local_dist; |
1727 | req->resp_key_dist = remote_dist; | |
e3f6a257 | 1728 | req->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1729 | |
1730 | smp->remote_key_dist = remote_dist; | |
1731 | ||
1732 | return; | |
1733 | } | |
1734 | ||
1735 | memset(rsp, 0, sizeof(*rsp)); | |
1736 | ||
a62da6f1 | 1737 | rsp->auth_req = SMP_AUTH_CT2; |
e3f6a257 | 1738 | rsp->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1739 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
1740 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
1741 | ||
1742 | smp->remote_key_dist = rsp->init_key_dist; | |
1743 | } | |
1744 | ||
da85e5e5 | 1745 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1746 | { |
3158c50c | 1747 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 1748 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 1749 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 1750 | struct smp_chan *smp; |
c7262e71 | 1751 | u8 key_size, auth, sec_level; |
8aab4757 | 1752 | int ret; |
88ba43b6 AB |
1753 | |
1754 | BT_DBG("conn %p", conn); | |
1755 | ||
c46b98be | 1756 | if (skb->len < sizeof(*req)) |
38e4a915 | 1757 | return SMP_INVALID_PARAMS; |
c46b98be | 1758 | |
40bef302 | 1759 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
1760 | return SMP_CMD_NOTSUPP; |
1761 | ||
fc75cc86 | 1762 | if (!chan->data) |
8aab4757 | 1763 | smp = smp_chan_create(conn); |
fc75cc86 | 1764 | else |
5d88cc73 | 1765 | smp = chan->data; |
8aab4757 | 1766 | |
d08fd0e7 AE |
1767 | if (!smp) |
1768 | return SMP_UNSPECIFIED; | |
d26a2345 | 1769 | |
c05b9339 | 1770 | /* We didn't start the pairing, so match remote */ |
0edb14de | 1771 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1772 | |
d7a5a11d | 1773 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 1774 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
1775 | return SMP_PAIRING_NOTSUPP; |
1776 | ||
d7a5a11d | 1777 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1778 | return SMP_AUTH_REQUIREMENTS; |
1779 | ||
1c1def09 VCG |
1780 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1781 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 1782 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 1783 | |
cb06d366 JH |
1784 | /* If the remote side's OOB flag is set it means it has |
1785 | * successfully received our local OOB data - therefore set the | |
1786 | * flag to indicate that local OOB is in use. | |
1787 | */ | |
2059cce1 | 1788 | if (req->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob) |
58428563 JH |
1789 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); |
1790 | ||
b5ae344d JH |
1791 | /* SMP over BR/EDR requires special treatment */ |
1792 | if (conn->hcon->type == ACL_LINK) { | |
1793 | /* We must have a BR/EDR SC link */ | |
08f63cc5 | 1794 | if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) && |
b7cb93e5 | 1795 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
1796 | return SMP_CROSS_TRANSP_NOT_ALLOWED; |
1797 | ||
1798 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1799 | ||
1800 | build_bredr_pairing_cmd(smp, req, &rsp); | |
1801 | ||
a62da6f1 JH |
1802 | if (req->auth_req & SMP_AUTH_CT2) |
1803 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1804 | ||
b5ae344d JH |
1805 | key_size = min(req->max_key_size, rsp.max_key_size); |
1806 | if (check_enc_key_size(conn, key_size)) | |
1807 | return SMP_ENC_KEY_SIZE; | |
1808 | ||
1809 | /* Clear bits which are generated but not distributed */ | |
1810 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1811 | ||
1812 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; | |
1813 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
1814 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); | |
1815 | ||
1816 | smp_distribute_keys(smp); | |
1817 | return 0; | |
1818 | } | |
1819 | ||
5e3d3d9b JH |
1820 | build_pairing_cmd(conn, req, &rsp, auth); |
1821 | ||
a62da6f1 | 1822 | if (rsp.auth_req & SMP_AUTH_SC) { |
5e3d3d9b JH |
1823 | set_bit(SMP_FLAG_SC, &smp->flags); |
1824 | ||
a62da6f1 JH |
1825 | if (rsp.auth_req & SMP_AUTH_CT2) |
1826 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1827 | } | |
1828 | ||
5be5e275 | 1829 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1830 | sec_level = BT_SECURITY_MEDIUM; |
1831 | else | |
1832 | sec_level = authreq_to_seclevel(auth); | |
1833 | ||
c7262e71 JH |
1834 | if (sec_level > conn->hcon->pending_sec_level) |
1835 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1836 | |
49c922bb | 1837 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1838 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1839 | u8 method; | |
1840 | ||
1841 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1842 | req->io_capability); | |
1843 | if (method == JUST_WORKS || method == JUST_CFM) | |
1844 | return SMP_AUTH_REQUIREMENTS; | |
1845 | } | |
1846 | ||
3158c50c VCG |
1847 | key_size = min(req->max_key_size, rsp.max_key_size); |
1848 | if (check_enc_key_size(conn, key_size)) | |
1849 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1850 | |
e84a6b13 | 1851 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1852 | |
1c1def09 VCG |
1853 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1854 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1855 | |
3158c50c | 1856 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1857 | |
1858 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1859 | ||
19c5ce9c JH |
1860 | /* Strictly speaking we shouldn't allow Pairing Confirm for the |
1861 | * SC case, however some implementations incorrectly copy RFU auth | |
1862 | * req bits from our security request, which may create a false | |
1863 | * positive SC enablement. | |
1864 | */ | |
1865 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1866 | ||
3b19146d JH |
1867 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1868 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1869 | /* Clear bits which are generated but not distributed */ | |
1870 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1871 | /* Wait for Public Key from Initiating Device */ | |
1872 | return 0; | |
3b19146d | 1873 | } |
da85e5e5 | 1874 | |
2b64d153 BG |
1875 | /* Request setup of TK */ |
1876 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1877 | if (ret) | |
1878 | return SMP_UNSPECIFIED; | |
1879 | ||
da85e5e5 | 1880 | return 0; |
88ba43b6 AB |
1881 | } |
1882 | ||
3b19146d JH |
1883 | static u8 sc_send_public_key(struct smp_chan *smp) |
1884 | { | |
70157ef5 JH |
1885 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
1886 | ||
3b19146d JH |
1887 | BT_DBG(""); |
1888 | ||
1a8bab4f | 1889 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { |
33d0c030 MH |
1890 | struct l2cap_chan *chan = hdev->smp_data; |
1891 | struct smp_dev *smp_dev; | |
1892 | ||
1893 | if (!chan || !chan->data) | |
1894 | return SMP_UNSPECIFIED; | |
1895 | ||
1896 | smp_dev = chan->data; | |
1897 | ||
1898 | memcpy(smp->local_pk, smp_dev->local_pk, 64); | |
fb334fee | 1899 | memcpy(smp->lr, smp_dev->local_rand, 16); |
33d0c030 MH |
1900 | |
1901 | if (smp_dev->debug_key) | |
1902 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1903 | ||
1904 | goto done; | |
1905 | } | |
1906 | ||
d7a5a11d | 1907 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { |
70157ef5 | 1908 | BT_DBG("Using debug keys"); |
c0153b0b TA |
1909 | if (set_ecdh_privkey(smp->tfm_ecdh, debug_sk)) |
1910 | return SMP_UNSPECIFIED; | |
70157ef5 | 1911 | memcpy(smp->local_pk, debug_pk, 64); |
70157ef5 JH |
1912 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); |
1913 | } else { | |
1914 | while (true) { | |
c0153b0b TA |
1915 | /* Generate key pair for Secure Connections */ |
1916 | if (generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk)) | |
70157ef5 | 1917 | return SMP_UNSPECIFIED; |
6c0dcc50 | 1918 | |
70157ef5 JH |
1919 | /* This is unlikely, but we need to check that |
1920 | * we didn't accidentially generate a debug key. | |
1921 | */ | |
c0153b0b | 1922 | if (crypto_memneq(smp->local_pk, debug_pk, 64)) |
70157ef5 JH |
1923 | break; |
1924 | } | |
6c0dcc50 | 1925 | } |
3b19146d | 1926 | |
33d0c030 | 1927 | done: |
c7a3d57d | 1928 | SMP_DBG("Local Public Key X: %32phN", smp->local_pk); |
8e4e2ee5 | 1929 | SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32); |
3b19146d JH |
1930 | |
1931 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1932 | ||
1933 | return 0; | |
1934 | } | |
1935 | ||
da85e5e5 | 1936 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1937 | { |
3158c50c | 1938 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1939 | struct l2cap_chan *chan = conn->smp; |
1940 | struct smp_chan *smp = chan->data; | |
0edb14de | 1941 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1942 | u8 key_size, auth; |
7d24ddcc | 1943 | int ret; |
88ba43b6 AB |
1944 | |
1945 | BT_DBG("conn %p", conn); | |
1946 | ||
c46b98be | 1947 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1948 | return SMP_INVALID_PARAMS; |
c46b98be | 1949 | |
40bef302 | 1950 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1951 | return SMP_CMD_NOTSUPP; |
1952 | ||
3158c50c VCG |
1953 | skb_pull(skb, sizeof(*rsp)); |
1954 | ||
1c1def09 | 1955 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1956 | |
3158c50c VCG |
1957 | key_size = min(req->max_key_size, rsp->max_key_size); |
1958 | if (check_enc_key_size(conn, key_size)) | |
1959 | return SMP_ENC_KEY_SIZE; | |
1960 | ||
0edb14de | 1961 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1962 | |
d7a5a11d | 1963 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1964 | return SMP_AUTH_REQUIREMENTS; |
1965 | ||
cb06d366 JH |
1966 | /* If the remote side's OOB flag is set it means it has |
1967 | * successfully received our local OOB data - therefore set the | |
1968 | * flag to indicate that local OOB is in use. | |
1969 | */ | |
2059cce1 | 1970 | if (rsp->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob) |
58428563 JH |
1971 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); |
1972 | ||
b5ae344d JH |
1973 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1974 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
1975 | ||
1976 | /* Update remote key distribution in case the remote cleared | |
1977 | * some bits that we had enabled in our request. | |
1978 | */ | |
1979 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1980 | ||
a62da6f1 JH |
1981 | if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2)) |
1982 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1983 | ||
b5ae344d JH |
1984 | /* For BR/EDR this means we're done and can start phase 3 */ |
1985 | if (conn->hcon->type == ACL_LINK) { | |
1986 | /* Clear bits which are generated but not distributed */ | |
1987 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1988 | smp_distribute_keys(smp); | |
1989 | return 0; | |
1990 | } | |
1991 | ||
65668776 JH |
1992 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1993 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1994 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1995 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1996 | |
49c922bb | 1997 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1998 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1999 | u8 method; | |
2000 | ||
2001 | method = get_auth_method(smp, req->io_capability, | |
2002 | rsp->io_capability); | |
2003 | if (method == JUST_WORKS || method == JUST_CFM) | |
2004 | return SMP_AUTH_REQUIREMENTS; | |
2005 | } | |
2006 | ||
e84a6b13 | 2007 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 2008 | |
fdcc4bec JH |
2009 | /* Update remote key distribution in case the remote cleared |
2010 | * some bits that we had enabled in our request. | |
2011 | */ | |
2012 | smp->remote_key_dist &= rsp->resp_key_dist; | |
2013 | ||
3b19146d JH |
2014 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2015 | /* Clear bits which are generated but not distributed */ | |
2016 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
2017 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
2018 | return sc_send_public_key(smp); | |
2019 | } | |
2020 | ||
c05b9339 | 2021 | auth |= req->auth_req; |
2b64d153 | 2022 | |
476585ec | 2023 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
2024 | if (ret) |
2025 | return SMP_UNSPECIFIED; | |
2026 | ||
4a74d658 | 2027 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
2028 | |
2029 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 2030 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 2031 | return smp_confirm(smp); |
da85e5e5 VCG |
2032 | |
2033 | return 0; | |
88ba43b6 AB |
2034 | } |
2035 | ||
dcee2b32 JH |
2036 | static u8 sc_check_confirm(struct smp_chan *smp) |
2037 | { | |
2038 | struct l2cap_conn *conn = smp->conn; | |
2039 | ||
2040 | BT_DBG(""); | |
2041 | ||
38606f14 JH |
2042 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2043 | return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM); | |
2044 | ||
dcee2b32 JH |
2045 | if (conn->hcon->out) { |
2046 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2047 | smp->prnd); | |
2048 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2049 | } | |
2050 | ||
2051 | return 0; | |
2052 | } | |
2053 | ||
19c5ce9c JH |
2054 | /* Work-around for some implementations that incorrectly copy RFU bits |
2055 | * from our security request and thereby create the impression that | |
2056 | * we're doing SC when in fact the remote doesn't support it. | |
2057 | */ | |
2058 | static int fixup_sc_false_positive(struct smp_chan *smp) | |
2059 | { | |
2060 | struct l2cap_conn *conn = smp->conn; | |
2061 | struct hci_conn *hcon = conn->hcon; | |
2062 | struct hci_dev *hdev = hcon->hdev; | |
2063 | struct smp_cmd_pairing *req, *rsp; | |
2064 | u8 auth; | |
2065 | ||
2066 | /* The issue is only observed when we're in slave role */ | |
2067 | if (hcon->out) | |
2068 | return SMP_UNSPECIFIED; | |
2069 | ||
2070 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) { | |
2064ee33 | 2071 | bt_dev_err(hdev, "refusing legacy fallback in SC-only mode"); |
19c5ce9c JH |
2072 | return SMP_UNSPECIFIED; |
2073 | } | |
2074 | ||
2064ee33 | 2075 | bt_dev_err(hdev, "trying to fall back to legacy SMP"); |
19c5ce9c JH |
2076 | |
2077 | req = (void *) &smp->preq[1]; | |
2078 | rsp = (void *) &smp->prsp[1]; | |
2079 | ||
2080 | /* Rebuild key dist flags which may have been cleared for SC */ | |
2081 | smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist); | |
2082 | ||
2083 | auth = req->auth_req & AUTH_REQ_MASK(hdev); | |
2084 | ||
2085 | if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) { | |
2064ee33 | 2086 | bt_dev_err(hdev, "failed to fall back to legacy SMP"); |
19c5ce9c JH |
2087 | return SMP_UNSPECIFIED; |
2088 | } | |
2089 | ||
2090 | clear_bit(SMP_FLAG_SC, &smp->flags); | |
2091 | ||
2092 | return 0; | |
2093 | } | |
2094 | ||
da85e5e5 | 2095 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2096 | { |
5d88cc73 JH |
2097 | struct l2cap_chan *chan = conn->smp; |
2098 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 2099 | |
88ba43b6 AB |
2100 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
2101 | ||
c46b98be | 2102 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 2103 | return SMP_INVALID_PARAMS; |
c46b98be | 2104 | |
1c1def09 VCG |
2105 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
2106 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 2107 | |
19c5ce9c JH |
2108 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2109 | int ret; | |
2110 | ||
2111 | /* Public Key exchange must happen before any other steps */ | |
2112 | if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags)) | |
2113 | return sc_check_confirm(smp); | |
2114 | ||
2115 | BT_ERR("Unexpected SMP Pairing Confirm"); | |
2116 | ||
2117 | ret = fixup_sc_false_positive(smp); | |
2118 | if (ret) | |
2119 | return ret; | |
2120 | } | |
dcee2b32 | 2121 | |
b28b4943 | 2122 | if (conn->hcon->out) { |
943a732a JH |
2123 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
2124 | smp->prnd); | |
b28b4943 JH |
2125 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
2126 | return 0; | |
2127 | } | |
2128 | ||
2129 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 2130 | return smp_confirm(smp); |
983f9814 MH |
2131 | |
2132 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
da85e5e5 VCG |
2133 | |
2134 | return 0; | |
88ba43b6 AB |
2135 | } |
2136 | ||
da85e5e5 | 2137 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2138 | { |
5d88cc73 JH |
2139 | struct l2cap_chan *chan = conn->smp; |
2140 | struct smp_chan *smp = chan->data; | |
191dc7fe JH |
2141 | struct hci_conn *hcon = conn->hcon; |
2142 | u8 *pkax, *pkbx, *na, *nb; | |
2143 | u32 passkey; | |
2144 | int err; | |
7d24ddcc | 2145 | |
8aab4757 | 2146 | BT_DBG("conn %p", conn); |
3158c50c | 2147 | |
c46b98be | 2148 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 2149 | return SMP_INVALID_PARAMS; |
c46b98be | 2150 | |
943a732a | 2151 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 2152 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 2153 | |
191dc7fe JH |
2154 | if (!test_bit(SMP_FLAG_SC, &smp->flags)) |
2155 | return smp_random(smp); | |
2156 | ||
580039e8 JH |
2157 | if (hcon->out) { |
2158 | pkax = smp->local_pk; | |
2159 | pkbx = smp->remote_pk; | |
2160 | na = smp->prnd; | |
2161 | nb = smp->rrnd; | |
2162 | } else { | |
2163 | pkax = smp->remote_pk; | |
2164 | pkbx = smp->local_pk; | |
2165 | na = smp->rrnd; | |
2166 | nb = smp->prnd; | |
2167 | } | |
2168 | ||
a29b0733 JH |
2169 | if (smp->method == REQ_OOB) { |
2170 | if (!hcon->out) | |
2171 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2172 | sizeof(smp->prnd), smp->prnd); | |
2173 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
2174 | goto mackey_and_ltk; | |
2175 | } | |
2176 | ||
38606f14 JH |
2177 | /* Passkey entry has special treatment */ |
2178 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
2179 | return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM); | |
2180 | ||
191dc7fe JH |
2181 | if (hcon->out) { |
2182 | u8 cfm[16]; | |
2183 | ||
2184 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
2185 | smp->rrnd, 0, cfm); | |
2186 | if (err) | |
2187 | return SMP_UNSPECIFIED; | |
2188 | ||
329d8230 | 2189 | if (crypto_memneq(smp->pcnf, cfm, 16)) |
191dc7fe | 2190 | return SMP_CONFIRM_FAILED; |
191dc7fe JH |
2191 | } else { |
2192 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2193 | smp->prnd); | |
2194 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
191dc7fe JH |
2195 | } |
2196 | ||
a29b0733 | 2197 | mackey_and_ltk: |
760b018b JH |
2198 | /* Generate MacKey and LTK */ |
2199 | err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk); | |
2200 | if (err) | |
2201 | return SMP_UNSPECIFIED; | |
2202 | ||
a29b0733 | 2203 | if (smp->method == JUST_WORKS || smp->method == REQ_OOB) { |
dddd3059 | 2204 | if (hcon->out) { |
38606f14 | 2205 | sc_dhkey_check(smp); |
dddd3059 JH |
2206 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
2207 | } | |
2208 | return 0; | |
2209 | } | |
2210 | ||
38606f14 JH |
2211 | err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey); |
2212 | if (err) | |
2213 | return SMP_UNSPECIFIED; | |
2214 | ||
2215 | err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type, | |
2216 | hcon->dst_type, passkey, 0); | |
191dc7fe JH |
2217 | if (err) |
2218 | return SMP_UNSPECIFIED; | |
2219 | ||
38606f14 JH |
2220 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2221 | ||
191dc7fe | 2222 | return 0; |
88ba43b6 AB |
2223 | } |
2224 | ||
f81cd823 | 2225 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 2226 | { |
c9839a11 | 2227 | struct smp_ltk *key; |
988c5997 VCG |
2228 | struct hci_conn *hcon = conn->hcon; |
2229 | ||
f3a73d97 | 2230 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 2231 | if (!key) |
f81cd823 | 2232 | return false; |
988c5997 | 2233 | |
a6f7833c | 2234 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 2235 | return false; |
4dab7864 | 2236 | |
51a8efd7 | 2237 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 2238 | return true; |
988c5997 | 2239 | |
8b76ce34 | 2240 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size); |
c9839a11 | 2241 | hcon->enc_key_size = key->enc_size; |
988c5997 | 2242 | |
fe59a05f JH |
2243 | /* We never store STKs for master role, so clear this flag */ |
2244 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
2245 | ||
f81cd823 | 2246 | return true; |
988c5997 | 2247 | } |
f1560463 | 2248 | |
35dc6f83 JH |
2249 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
2250 | enum smp_key_pref key_pref) | |
854f4727 JH |
2251 | { |
2252 | if (sec_level == BT_SECURITY_LOW) | |
2253 | return true; | |
2254 | ||
35dc6f83 JH |
2255 | /* If we're encrypted with an STK but the caller prefers using |
2256 | * LTK claim insufficient security. This way we allow the | |
2257 | * connection to be re-encrypted with an LTK, even if the LTK | |
2258 | * provides the same level of security. Only exception is if we | |
2259 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 2260 | */ |
35dc6f83 JH |
2261 | if (key_pref == SMP_USE_LTK && |
2262 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 2263 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
2264 | return false; |
2265 | ||
854f4727 JH |
2266 | if (hcon->sec_level >= sec_level) |
2267 | return true; | |
2268 | ||
2269 | return false; | |
2270 | } | |
2271 | ||
da85e5e5 | 2272 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
2273 | { |
2274 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
2275 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 2276 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 2277 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 2278 | struct smp_chan *smp; |
c05b9339 | 2279 | u8 sec_level, auth; |
88ba43b6 AB |
2280 | |
2281 | BT_DBG("conn %p", conn); | |
2282 | ||
c46b98be | 2283 | if (skb->len < sizeof(*rp)) |
38e4a915 | 2284 | return SMP_INVALID_PARAMS; |
c46b98be | 2285 | |
40bef302 | 2286 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
2287 | return SMP_CMD_NOTSUPP; |
2288 | ||
0edb14de | 2289 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 2290 | |
d7a5a11d | 2291 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
2292 | return SMP_AUTH_REQUIREMENTS; |
2293 | ||
5be5e275 | 2294 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
2295 | sec_level = BT_SECURITY_MEDIUM; |
2296 | else | |
2297 | sec_level = authreq_to_seclevel(auth); | |
2298 | ||
c1567ad0 SJ |
2299 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) { |
2300 | /* If link is already encrypted with sufficient security we | |
2301 | * still need refresh encryption as per Core Spec 5.0 Vol 3, | |
2302 | * Part H 2.4.6 | |
2303 | */ | |
2304 | smp_ltk_encrypt(conn, hcon->sec_level); | |
854f4727 | 2305 | return 0; |
c1567ad0 | 2306 | } |
854f4727 | 2307 | |
c7262e71 JH |
2308 | if (sec_level > hcon->pending_sec_level) |
2309 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 2310 | |
4dab7864 | 2311 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
2312 | return 0; |
2313 | ||
8aab4757 | 2314 | smp = smp_chan_create(conn); |
c29d2444 JH |
2315 | if (!smp) |
2316 | return SMP_UNSPECIFIED; | |
d26a2345 | 2317 | |
d7a5a11d | 2318 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 2319 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
2320 | return SMP_PAIRING_NOTSUPP; |
2321 | ||
88ba43b6 | 2322 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 2323 | |
da85e5e5 | 2324 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 2325 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 2326 | |
1c1def09 VCG |
2327 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2328 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2329 | |
88ba43b6 | 2330 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2331 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 2332 | |
da85e5e5 | 2333 | return 0; |
88ba43b6 AB |
2334 | } |
2335 | ||
cc110922 | 2336 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 2337 | { |
cc110922 | 2338 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 2339 | struct l2cap_chan *chan; |
0a66cf20 | 2340 | struct smp_chan *smp; |
2b64d153 | 2341 | __u8 authreq; |
fc75cc86 | 2342 | int ret; |
eb492e01 | 2343 | |
3a0259bb VCG |
2344 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
2345 | ||
0a66cf20 JH |
2346 | /* This may be NULL if there's an unexpected disconnection */ |
2347 | if (!conn) | |
2348 | return 1; | |
2349 | ||
d7a5a11d | 2350 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) |
2e65c9d2 AG |
2351 | return 1; |
2352 | ||
35dc6f83 | 2353 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 2354 | return 1; |
f1cb9af5 | 2355 | |
c7262e71 JH |
2356 | if (sec_level > hcon->pending_sec_level) |
2357 | hcon->pending_sec_level = sec_level; | |
2358 | ||
40bef302 | 2359 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
2360 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
2361 | return 0; | |
d26a2345 | 2362 | |
d8949aad JH |
2363 | chan = conn->smp; |
2364 | if (!chan) { | |
2064ee33 | 2365 | bt_dev_err(hcon->hdev, "security requested but not available"); |
d8949aad JH |
2366 | return 1; |
2367 | } | |
2368 | ||
fc75cc86 JH |
2369 | l2cap_chan_lock(chan); |
2370 | ||
2371 | /* If SMP is already in progress ignore this request */ | |
2372 | if (chan->data) { | |
2373 | ret = 0; | |
2374 | goto unlock; | |
2375 | } | |
d26a2345 | 2376 | |
8aab4757 | 2377 | smp = smp_chan_create(conn); |
fc75cc86 JH |
2378 | if (!smp) { |
2379 | ret = 1; | |
2380 | goto unlock; | |
2381 | } | |
2b64d153 BG |
2382 | |
2383 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 2384 | |
a62da6f1 | 2385 | if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) { |
d2eb9e10 | 2386 | authreq |= SMP_AUTH_SC; |
a62da6f1 JH |
2387 | if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED)) |
2388 | authreq |= SMP_AUTH_CT2; | |
2389 | } | |
d2eb9e10 | 2390 | |
79897d20 JH |
2391 | /* Require MITM if IO Capability allows or the security level |
2392 | * requires it. | |
2e233644 | 2393 | */ |
79897d20 | 2394 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 2395 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
2396 | authreq |= SMP_AUTH_MITM; |
2397 | ||
40bef302 | 2398 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 2399 | struct smp_cmd_pairing cp; |
f01ead31 | 2400 | |
2b64d153 | 2401 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
2402 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2403 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2404 | |
eb492e01 | 2405 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2406 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
2407 | } else { |
2408 | struct smp_cmd_security_req cp; | |
2b64d153 | 2409 | cp.auth_req = authreq; |
eb492e01 | 2410 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 2411 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
2412 | } |
2413 | ||
4a74d658 | 2414 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 2415 | ret = 0; |
edca792c | 2416 | |
fc75cc86 JH |
2417 | unlock: |
2418 | l2cap_chan_unlock(chan); | |
2419 | return ret; | |
eb492e01 AB |
2420 | } |
2421 | ||
ce99697a MK |
2422 | int smp_cancel_and_remove_pairing(struct hci_dev *hdev, bdaddr_t *bdaddr, |
2423 | u8 addr_type) | |
c81d555a | 2424 | { |
ce99697a MK |
2425 | struct hci_conn *hcon; |
2426 | struct l2cap_conn *conn; | |
c81d555a JH |
2427 | struct l2cap_chan *chan; |
2428 | struct smp_chan *smp; | |
ce99697a MK |
2429 | int err; |
2430 | ||
2431 | err = hci_remove_ltk(hdev, bdaddr, addr_type); | |
2432 | hci_remove_irk(hdev, bdaddr, addr_type); | |
2433 | ||
2434 | hcon = hci_conn_hash_lookup_le(hdev, bdaddr, addr_type); | |
2435 | if (!hcon) | |
2436 | goto done; | |
c81d555a | 2437 | |
ce99697a | 2438 | conn = hcon->l2cap_data; |
c81d555a | 2439 | if (!conn) |
ce99697a | 2440 | goto done; |
c81d555a JH |
2441 | |
2442 | chan = conn->smp; | |
2443 | if (!chan) | |
ce99697a | 2444 | goto done; |
c81d555a JH |
2445 | |
2446 | l2cap_chan_lock(chan); | |
2447 | ||
2448 | smp = chan->data; | |
2449 | if (smp) { | |
ce99697a MK |
2450 | /* Set keys to NULL to make sure smp_failure() does not try to |
2451 | * remove and free already invalidated rcu list entries. */ | |
2452 | smp->ltk = NULL; | |
2453 | smp->slave_ltk = NULL; | |
2454 | smp->remote_irk = NULL; | |
2455 | ||
c81d555a JH |
2456 | if (test_bit(SMP_FLAG_COMPLETE, &smp->flags)) |
2457 | smp_failure(conn, 0); | |
2458 | else | |
2459 | smp_failure(conn, SMP_UNSPECIFIED); | |
ce99697a | 2460 | err = 0; |
c81d555a JH |
2461 | } |
2462 | ||
2463 | l2cap_chan_unlock(chan); | |
ce99697a MK |
2464 | |
2465 | done: | |
2466 | return err; | |
c81d555a JH |
2467 | } |
2468 | ||
7034b911 VCG |
2469 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2470 | { | |
16b90839 | 2471 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
2472 | struct l2cap_chan *chan = conn->smp; |
2473 | struct smp_chan *smp = chan->data; | |
16b90839 | 2474 | |
c46b98be JH |
2475 | BT_DBG("conn %p", conn); |
2476 | ||
2477 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2478 | return SMP_INVALID_PARAMS; |
c46b98be | 2479 | |
b28b4943 | 2480 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 2481 | |
16b90839 VCG |
2482 | skb_pull(skb, sizeof(*rp)); |
2483 | ||
1c1def09 | 2484 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 2485 | |
7034b911 VCG |
2486 | return 0; |
2487 | } | |
2488 | ||
2489 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
2490 | { | |
16b90839 | 2491 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
2492 | struct l2cap_chan *chan = conn->smp; |
2493 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
2494 | struct hci_dev *hdev = conn->hcon->hdev; |
2495 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 2496 | struct smp_ltk *ltk; |
c9839a11 | 2497 | u8 authenticated; |
16b90839 | 2498 | |
c46b98be JH |
2499 | BT_DBG("conn %p", conn); |
2500 | ||
2501 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2502 | return SMP_INVALID_PARAMS; |
c46b98be | 2503 | |
9747a9f3 JH |
2504 | /* Mark the information as received */ |
2505 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
2506 | ||
b28b4943 JH |
2507 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
2508 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
2509 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
2510 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 2511 | |
16b90839 | 2512 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 2513 | |
ce39fb4e | 2514 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 2515 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
2516 | authenticated, smp->tk, smp->enc_key_size, |
2517 | rp->ediv, rp->rand); | |
2518 | smp->ltk = ltk; | |
c6e81e9a | 2519 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 2520 | smp_distribute_keys(smp); |
7034b911 VCG |
2521 | |
2522 | return 0; | |
2523 | } | |
2524 | ||
fd349c02 JH |
2525 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2526 | { | |
2527 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
2528 | struct l2cap_chan *chan = conn->smp; |
2529 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2530 | |
2531 | BT_DBG(""); | |
2532 | ||
2533 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2534 | return SMP_INVALID_PARAMS; |
fd349c02 | 2535 | |
b28b4943 | 2536 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 2537 | |
fd349c02 JH |
2538 | skb_pull(skb, sizeof(*info)); |
2539 | ||
2540 | memcpy(smp->irk, info->irk, 16); | |
2541 | ||
2542 | return 0; | |
2543 | } | |
2544 | ||
2545 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
2546 | struct sk_buff *skb) | |
2547 | { | |
2548 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
2549 | struct l2cap_chan *chan = conn->smp; |
2550 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2551 | struct hci_conn *hcon = conn->hcon; |
2552 | bdaddr_t rpa; | |
2553 | ||
2554 | BT_DBG(""); | |
2555 | ||
2556 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2557 | return SMP_INVALID_PARAMS; |
fd349c02 | 2558 | |
9747a9f3 JH |
2559 | /* Mark the information as received */ |
2560 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
2561 | ||
b28b4943 JH |
2562 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
2563 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
2564 | ||
fd349c02 JH |
2565 | skb_pull(skb, sizeof(*info)); |
2566 | ||
a9a58f86 JH |
2567 | /* Strictly speaking the Core Specification (4.1) allows sending |
2568 | * an empty address which would force us to rely on just the IRK | |
2569 | * as "identity information". However, since such | |
2570 | * implementations are not known of and in order to not over | |
2571 | * complicate our implementation, simply pretend that we never | |
2572 | * received an IRK for such a device. | |
e12af489 JH |
2573 | * |
2574 | * The Identity Address must also be a Static Random or Public | |
2575 | * Address, which hci_is_identity_address() checks for. | |
a9a58f86 | 2576 | */ |
e12af489 JH |
2577 | if (!bacmp(&info->bdaddr, BDADDR_ANY) || |
2578 | !hci_is_identity_address(&info->bdaddr, info->addr_type)) { | |
2064ee33 | 2579 | bt_dev_err(hcon->hdev, "ignoring IRK with no identity address"); |
31dd624e | 2580 | goto distribute; |
a9a58f86 JH |
2581 | } |
2582 | ||
79d6371a SJ |
2583 | /* Drop IRK if peer is using identity address during pairing but is |
2584 | * providing different address as identity information. | |
2585 | * | |
2586 | * Microsoft Surface Precision Mouse is known to have this bug. | |
2587 | */ | |
2588 | if (hci_is_identity_address(&hcon->dst, hcon->dst_type) && | |
2589 | (bacmp(&info->bdaddr, &hcon->dst) || | |
2590 | info->addr_type != hcon->dst_type)) { | |
2591 | bt_dev_err(hcon->hdev, | |
2592 | "ignoring IRK with invalid identity address"); | |
2593 | goto distribute; | |
2594 | } | |
2595 | ||
fd349c02 JH |
2596 | bacpy(&smp->id_addr, &info->bdaddr); |
2597 | smp->id_addr_type = info->addr_type; | |
2598 | ||
2599 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
2600 | bacpy(&rpa, &hcon->dst); | |
2601 | else | |
2602 | bacpy(&rpa, BDADDR_ANY); | |
2603 | ||
23d0e128 JH |
2604 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
2605 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 2606 | |
31dd624e | 2607 | distribute: |
c6e81e9a JH |
2608 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
2609 | smp_distribute_keys(smp); | |
fd349c02 JH |
2610 | |
2611 | return 0; | |
2612 | } | |
2613 | ||
7ee4ea36 MH |
2614 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2615 | { | |
2616 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
2617 | struct l2cap_chan *chan = conn->smp; |
2618 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
2619 | struct smp_csrk *csrk; |
2620 | ||
2621 | BT_DBG("conn %p", conn); | |
2622 | ||
2623 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2624 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 2625 | |
7ee4ea36 MH |
2626 | /* Mark the information as received */ |
2627 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
2628 | ||
2629 | skb_pull(skb, sizeof(*rp)); | |
2630 | ||
7ee4ea36 MH |
2631 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
2632 | if (csrk) { | |
4cd3928a JH |
2633 | if (conn->hcon->sec_level > BT_SECURITY_MEDIUM) |
2634 | csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED; | |
2635 | else | |
2636 | csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED; | |
7ee4ea36 MH |
2637 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); |
2638 | } | |
2639 | smp->csrk = csrk; | |
d6268e86 | 2640 | smp_distribute_keys(smp); |
7ee4ea36 MH |
2641 | |
2642 | return 0; | |
2643 | } | |
2644 | ||
5e3d3d9b JH |
2645 | static u8 sc_select_method(struct smp_chan *smp) |
2646 | { | |
2647 | struct l2cap_conn *conn = smp->conn; | |
2648 | struct hci_conn *hcon = conn->hcon; | |
2649 | struct smp_cmd_pairing *local, *remote; | |
2650 | u8 local_mitm, remote_mitm, local_io, remote_io, method; | |
2651 | ||
1a8bab4f JH |
2652 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) || |
2653 | test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) | |
a29b0733 JH |
2654 | return REQ_OOB; |
2655 | ||
5e3d3d9b JH |
2656 | /* The preq/prsp contain the raw Pairing Request/Response PDUs |
2657 | * which are needed as inputs to some crypto functions. To get | |
2658 | * the "struct smp_cmd_pairing" from them we need to skip the | |
2659 | * first byte which contains the opcode. | |
2660 | */ | |
2661 | if (hcon->out) { | |
2662 | local = (void *) &smp->preq[1]; | |
2663 | remote = (void *) &smp->prsp[1]; | |
2664 | } else { | |
2665 | local = (void *) &smp->prsp[1]; | |
2666 | remote = (void *) &smp->preq[1]; | |
2667 | } | |
2668 | ||
2669 | local_io = local->io_capability; | |
2670 | remote_io = remote->io_capability; | |
2671 | ||
2672 | local_mitm = (local->auth_req & SMP_AUTH_MITM); | |
2673 | remote_mitm = (remote->auth_req & SMP_AUTH_MITM); | |
2674 | ||
2675 | /* If either side wants MITM, look up the method from the table, | |
2676 | * otherwise use JUST WORKS. | |
2677 | */ | |
2678 | if (local_mitm || remote_mitm) | |
2679 | method = get_auth_method(smp, local_io, remote_io); | |
2680 | else | |
2681 | method = JUST_WORKS; | |
2682 | ||
2683 | /* Don't confirm locally initiated pairing attempts */ | |
2684 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) | |
2685 | method = JUST_WORKS; | |
2686 | ||
2687 | return method; | |
2688 | } | |
2689 | ||
d8f8edbe JH |
2690 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
2691 | { | |
2692 | struct smp_cmd_public_key *key = (void *) skb->data; | |
2693 | struct hci_conn *hcon = conn->hcon; | |
2694 | struct l2cap_chan *chan = conn->smp; | |
2695 | struct smp_chan *smp = chan->data; | |
5e3d3d9b | 2696 | struct hci_dev *hdev = hcon->hdev; |
c0153b0b | 2697 | struct crypto_kpp *tfm_ecdh; |
cbbbe3e2 | 2698 | struct smp_cmd_pairing_confirm cfm; |
d8f8edbe JH |
2699 | int err; |
2700 | ||
2701 | BT_DBG("conn %p", conn); | |
2702 | ||
2703 | if (skb->len < sizeof(*key)) | |
2704 | return SMP_INVALID_PARAMS; | |
2705 | ||
2706 | memcpy(smp->remote_pk, key, 64); | |
2707 | ||
a8ca617c JH |
2708 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) { |
2709 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk, | |
2710 | smp->rr, 0, cfm.confirm_val); | |
2711 | if (err) | |
2712 | return SMP_UNSPECIFIED; | |
2713 | ||
329d8230 | 2714 | if (crypto_memneq(cfm.confirm_val, smp->pcnf, 16)) |
a8ca617c JH |
2715 | return SMP_CONFIRM_FAILED; |
2716 | } | |
2717 | ||
d8f8edbe JH |
2718 | /* Non-initiating device sends its public key after receiving |
2719 | * the key from the initiating device. | |
2720 | */ | |
2721 | if (!hcon->out) { | |
2722 | err = sc_send_public_key(smp); | |
2723 | if (err) | |
2724 | return err; | |
2725 | } | |
2726 | ||
c7a3d57d | 2727 | SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk); |
e091526d | 2728 | SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32); |
d8f8edbe | 2729 | |
c0153b0b TA |
2730 | /* Compute the shared secret on the same crypto tfm on which the private |
2731 | * key was set/generated. | |
2732 | */ | |
2733 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { | |
a2ffec58 MK |
2734 | struct l2cap_chan *hchan = hdev->smp_data; |
2735 | struct smp_dev *smp_dev; | |
2736 | ||
2737 | if (!hchan || !hchan->data) | |
2738 | return SMP_UNSPECIFIED; | |
2739 | ||
2740 | smp_dev = hchan->data; | |
c0153b0b TA |
2741 | |
2742 | tfm_ecdh = smp_dev->tfm_ecdh; | |
2743 | } else { | |
2744 | tfm_ecdh = smp->tfm_ecdh; | |
2745 | } | |
2746 | ||
2747 | if (compute_ecdh_secret(tfm_ecdh, smp->remote_pk, smp->dhkey)) | |
d8f8edbe JH |
2748 | return SMP_UNSPECIFIED; |
2749 | ||
c7a3d57d | 2750 | SMP_DBG("DHKey %32phN", smp->dhkey); |
d8f8edbe JH |
2751 | |
2752 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
2753 | ||
5e3d3d9b JH |
2754 | smp->method = sc_select_method(smp); |
2755 | ||
2756 | BT_DBG("%s selected method 0x%02x", hdev->name, smp->method); | |
2757 | ||
2758 | /* JUST_WORKS and JUST_CFM result in an unauthenticated key */ | |
2759 | if (smp->method == JUST_WORKS || smp->method == JUST_CFM) | |
2760 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; | |
2761 | else | |
2762 | hcon->pending_sec_level = BT_SECURITY_FIPS; | |
2763 | ||
329d8230 | 2764 | if (!crypto_memneq(debug_pk, smp->remote_pk, 64)) |
aeb7d461 JH |
2765 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); |
2766 | ||
38606f14 JH |
2767 | if (smp->method == DSP_PASSKEY) { |
2768 | get_random_bytes(&hcon->passkey_notify, | |
2769 | sizeof(hcon->passkey_notify)); | |
2770 | hcon->passkey_notify %= 1000000; | |
2771 | hcon->passkey_entered = 0; | |
2772 | smp->passkey_round = 0; | |
2773 | if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type, | |
2774 | hcon->dst_type, | |
2775 | hcon->passkey_notify, | |
2776 | hcon->passkey_entered)) | |
2777 | return SMP_UNSPECIFIED; | |
2778 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2779 | return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY); | |
2780 | } | |
2781 | ||
94ea7257 | 2782 | if (smp->method == REQ_OOB) { |
a29b0733 JH |
2783 | if (hcon->out) |
2784 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2785 | sizeof(smp->prnd), smp->prnd); | |
2786 | ||
2787 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2788 | ||
2789 | return 0; | |
2790 | } | |
2791 | ||
38606f14 JH |
2792 | if (hcon->out) |
2793 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2794 | ||
2795 | if (smp->method == REQ_PASSKEY) { | |
2796 | if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type, | |
2797 | hcon->dst_type)) | |
2798 | return SMP_UNSPECIFIED; | |
2799 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2800 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
2801 | return 0; | |
2802 | } | |
2803 | ||
cbbbe3e2 JH |
2804 | /* The Initiating device waits for the non-initiating device to |
2805 | * send the confirm value. | |
2806 | */ | |
2807 | if (conn->hcon->out) | |
2808 | return 0; | |
2809 | ||
2810 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, | |
2811 | 0, cfm.confirm_val); | |
2812 | if (err) | |
2813 | return SMP_UNSPECIFIED; | |
2814 | ||
2815 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
2816 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2817 | ||
d8f8edbe JH |
2818 | return 0; |
2819 | } | |
2820 | ||
6433a9a2 JH |
2821 | static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb) |
2822 | { | |
2823 | struct smp_cmd_dhkey_check *check = (void *) skb->data; | |
2824 | struct l2cap_chan *chan = conn->smp; | |
2825 | struct hci_conn *hcon = conn->hcon; | |
2826 | struct smp_chan *smp = chan->data; | |
2827 | u8 a[7], b[7], *local_addr, *remote_addr; | |
2828 | u8 io_cap[3], r[16], e[16]; | |
2829 | int err; | |
2830 | ||
2831 | BT_DBG("conn %p", conn); | |
2832 | ||
2833 | if (skb->len < sizeof(*check)) | |
2834 | return SMP_INVALID_PARAMS; | |
2835 | ||
2836 | memcpy(a, &hcon->init_addr, 6); | |
2837 | memcpy(b, &hcon->resp_addr, 6); | |
2838 | a[6] = hcon->init_addr_type; | |
2839 | b[6] = hcon->resp_addr_type; | |
2840 | ||
2841 | if (hcon->out) { | |
2842 | local_addr = a; | |
2843 | remote_addr = b; | |
2844 | memcpy(io_cap, &smp->prsp[1], 3); | |
2845 | } else { | |
2846 | local_addr = b; | |
2847 | remote_addr = a; | |
2848 | memcpy(io_cap, &smp->preq[1], 3); | |
2849 | } | |
2850 | ||
2851 | memset(r, 0, sizeof(r)); | |
2852 | ||
38606f14 JH |
2853 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2854 | put_unaligned_le32(hcon->passkey_notify, r); | |
882fafad JH |
2855 | else if (smp->method == REQ_OOB) |
2856 | memcpy(r, smp->lr, 16); | |
38606f14 | 2857 | |
6433a9a2 JH |
2858 | err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r, |
2859 | io_cap, remote_addr, local_addr, e); | |
2860 | if (err) | |
2861 | return SMP_UNSPECIFIED; | |
2862 | ||
329d8230 | 2863 | if (crypto_memneq(check->e, e, 16)) |
6433a9a2 JH |
2864 | return SMP_DHKEY_CHECK_FAILED; |
2865 | ||
d3e54a87 JH |
2866 | if (!hcon->out) { |
2867 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
2868 | set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags); | |
2869 | return 0; | |
2870 | } | |
d378a2d7 | 2871 | |
d3e54a87 JH |
2872 | /* Slave sends DHKey check as response to master */ |
2873 | sc_dhkey_check(smp); | |
2874 | } | |
d378a2d7 | 2875 | |
d3e54a87 | 2876 | sc_add_ltk(smp); |
6433a9a2 JH |
2877 | |
2878 | if (hcon->out) { | |
8b76ce34 | 2879 | hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size); |
6433a9a2 JH |
2880 | hcon->enc_key_size = smp->enc_key_size; |
2881 | } | |
2882 | ||
2883 | return 0; | |
2884 | } | |
2885 | ||
1408bb6e JH |
2886 | static int smp_cmd_keypress_notify(struct l2cap_conn *conn, |
2887 | struct sk_buff *skb) | |
2888 | { | |
2889 | struct smp_cmd_keypress_notify *kp = (void *) skb->data; | |
2890 | ||
2891 | BT_DBG("value 0x%02x", kp->value); | |
2892 | ||
2893 | return 0; | |
2894 | } | |
2895 | ||
4befb867 | 2896 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 2897 | { |
5d88cc73 | 2898 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 2899 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 2900 | struct smp_chan *smp; |
92381f5c | 2901 | __u8 code, reason; |
eb492e01 AB |
2902 | int err = 0; |
2903 | ||
8ae9b984 | 2904 | if (skb->len < 1) |
92381f5c | 2905 | return -EILSEQ; |
92381f5c | 2906 | |
d7a5a11d | 2907 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) { |
2e65c9d2 AG |
2908 | reason = SMP_PAIRING_NOTSUPP; |
2909 | goto done; | |
2910 | } | |
2911 | ||
92381f5c | 2912 | code = skb->data[0]; |
eb492e01 AB |
2913 | skb_pull(skb, sizeof(code)); |
2914 | ||
b28b4943 JH |
2915 | smp = chan->data; |
2916 | ||
2917 | if (code > SMP_CMD_MAX) | |
2918 | goto drop; | |
2919 | ||
24bd0bd9 | 2920 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
2921 | goto drop; |
2922 | ||
2923 | /* If we don't have a context the only allowed commands are | |
2924 | * pairing request and security request. | |
8cf9fa12 | 2925 | */ |
b28b4943 JH |
2926 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
2927 | goto drop; | |
8cf9fa12 | 2928 | |
eb492e01 AB |
2929 | switch (code) { |
2930 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 2931 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
2932 | break; |
2933 | ||
2934 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 2935 | smp_failure(conn, 0); |
da85e5e5 | 2936 | err = -EPERM; |
eb492e01 AB |
2937 | break; |
2938 | ||
2939 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 2940 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
2941 | break; |
2942 | ||
2943 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 2944 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
2945 | break; |
2946 | ||
eb492e01 | 2947 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 2948 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
2949 | break; |
2950 | ||
eb492e01 | 2951 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 2952 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
2953 | break; |
2954 | ||
eb492e01 | 2955 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
2956 | reason = smp_cmd_encrypt_info(conn, skb); |
2957 | break; | |
2958 | ||
eb492e01 | 2959 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
2960 | reason = smp_cmd_master_ident(conn, skb); |
2961 | break; | |
2962 | ||
eb492e01 | 2963 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
2964 | reason = smp_cmd_ident_info(conn, skb); |
2965 | break; | |
2966 | ||
eb492e01 | 2967 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
2968 | reason = smp_cmd_ident_addr_info(conn, skb); |
2969 | break; | |
2970 | ||
eb492e01 | 2971 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 2972 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
2973 | break; |
2974 | ||
d8f8edbe JH |
2975 | case SMP_CMD_PUBLIC_KEY: |
2976 | reason = smp_cmd_public_key(conn, skb); | |
2977 | break; | |
2978 | ||
6433a9a2 JH |
2979 | case SMP_CMD_DHKEY_CHECK: |
2980 | reason = smp_cmd_dhkey_check(conn, skb); | |
2981 | break; | |
2982 | ||
1408bb6e JH |
2983 | case SMP_CMD_KEYPRESS_NOTIFY: |
2984 | reason = smp_cmd_keypress_notify(conn, skb); | |
2985 | break; | |
2986 | ||
eb492e01 AB |
2987 | default: |
2988 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 2989 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 2990 | goto done; |
eb492e01 AB |
2991 | } |
2992 | ||
3a0259bb | 2993 | done: |
9b7b18ef JH |
2994 | if (!err) { |
2995 | if (reason) | |
2996 | smp_failure(conn, reason); | |
8ae9b984 | 2997 | kfree_skb(skb); |
9b7b18ef JH |
2998 | } |
2999 | ||
eb492e01 | 3000 | return err; |
b28b4943 JH |
3001 | |
3002 | drop: | |
2064ee33 MH |
3003 | bt_dev_err(hcon->hdev, "unexpected SMP command 0x%02x from %pMR", |
3004 | code, &hcon->dst); | |
b28b4943 JH |
3005 | kfree_skb(skb); |
3006 | return 0; | |
eb492e01 | 3007 | } |
7034b911 | 3008 | |
70db83c4 JH |
3009 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
3010 | { | |
3011 | struct l2cap_conn *conn = chan->conn; | |
3012 | ||
3013 | BT_DBG("chan %p", chan); | |
3014 | ||
fc75cc86 | 3015 | if (chan->data) |
5d88cc73 | 3016 | smp_chan_destroy(conn); |
5d88cc73 | 3017 | |
70db83c4 JH |
3018 | conn->smp = NULL; |
3019 | l2cap_chan_put(chan); | |
3020 | } | |
3021 | ||
b5ae344d JH |
3022 | static void bredr_pairing(struct l2cap_chan *chan) |
3023 | { | |
3024 | struct l2cap_conn *conn = chan->conn; | |
3025 | struct hci_conn *hcon = conn->hcon; | |
3026 | struct hci_dev *hdev = hcon->hdev; | |
3027 | struct smp_cmd_pairing req; | |
3028 | struct smp_chan *smp; | |
3029 | ||
3030 | BT_DBG("chan %p", chan); | |
3031 | ||
3032 | /* Only new pairings are interesting */ | |
3033 | if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags)) | |
3034 | return; | |
3035 | ||
3036 | /* Don't bother if we're not encrypted */ | |
3037 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
3038 | return; | |
3039 | ||
3040 | /* Only master may initiate SMP over BR/EDR */ | |
3041 | if (hcon->role != HCI_ROLE_MASTER) | |
3042 | return; | |
3043 | ||
3044 | /* Secure Connections support must be enabled */ | |
d7a5a11d | 3045 | if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED)) |
b5ae344d JH |
3046 | return; |
3047 | ||
3048 | /* BR/EDR must use Secure Connections for SMP */ | |
3049 | if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) && | |
b7cb93e5 | 3050 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
3051 | return; |
3052 | ||
3053 | /* If our LE support is not enabled don't do anything */ | |
d7a5a11d | 3054 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
b5ae344d JH |
3055 | return; |
3056 | ||
3057 | /* Don't bother if remote LE support is not enabled */ | |
3058 | if (!lmp_host_le_capable(hcon)) | |
3059 | return; | |
3060 | ||
3061 | /* Remote must support SMP fixed chan for BR/EDR */ | |
3062 | if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR)) | |
3063 | return; | |
3064 | ||
3065 | /* Don't bother if SMP is already ongoing */ | |
3066 | if (chan->data) | |
3067 | return; | |
3068 | ||
3069 | smp = smp_chan_create(conn); | |
3070 | if (!smp) { | |
2064ee33 | 3071 | bt_dev_err(hdev, "unable to create SMP context for BR/EDR"); |
b5ae344d JH |
3072 | return; |
3073 | } | |
3074 | ||
3075 | set_bit(SMP_FLAG_SC, &smp->flags); | |
3076 | ||
3077 | BT_DBG("%s starting SMP over BR/EDR", hdev->name); | |
3078 | ||
3079 | /* Prepare and send the BR/EDR SMP Pairing Request */ | |
3080 | build_bredr_pairing_cmd(smp, &req, NULL); | |
3081 | ||
3082 | smp->preq[0] = SMP_CMD_PAIRING_REQ; | |
3083 | memcpy(&smp->preq[1], &req, sizeof(req)); | |
3084 | ||
3085 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req); | |
3086 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); | |
3087 | } | |
3088 | ||
44f1a7ab JH |
3089 | static void smp_resume_cb(struct l2cap_chan *chan) |
3090 | { | |
b68fda68 | 3091 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
3092 | struct l2cap_conn *conn = chan->conn; |
3093 | struct hci_conn *hcon = conn->hcon; | |
3094 | ||
3095 | BT_DBG("chan %p", chan); | |
3096 | ||
b5ae344d JH |
3097 | if (hcon->type == ACL_LINK) { |
3098 | bredr_pairing(chan); | |
ef8efe4b | 3099 | return; |
b5ae344d | 3100 | } |
ef8efe4b | 3101 | |
86d1407c JH |
3102 | if (!smp) |
3103 | return; | |
b68fda68 | 3104 | |
84bc0db5 JH |
3105 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
3106 | return; | |
3107 | ||
86d1407c JH |
3108 | cancel_delayed_work(&smp->security_timer); |
3109 | ||
d6268e86 | 3110 | smp_distribute_keys(smp); |
44f1a7ab JH |
3111 | } |
3112 | ||
70db83c4 JH |
3113 | static void smp_ready_cb(struct l2cap_chan *chan) |
3114 | { | |
3115 | struct l2cap_conn *conn = chan->conn; | |
b5ae344d | 3116 | struct hci_conn *hcon = conn->hcon; |
70db83c4 JH |
3117 | |
3118 | BT_DBG("chan %p", chan); | |
3119 | ||
7883746b JH |
3120 | /* No need to call l2cap_chan_hold() here since we already own |
3121 | * the reference taken in smp_new_conn_cb(). This is just the | |
3122 | * first time that we tie it to a specific pointer. The code in | |
3123 | * l2cap_core.c ensures that there's no risk this function wont | |
3124 | * get called if smp_new_conn_cb was previously called. | |
3125 | */ | |
70db83c4 | 3126 | conn->smp = chan; |
b5ae344d JH |
3127 | |
3128 | if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
3129 | bredr_pairing(chan); | |
70db83c4 JH |
3130 | } |
3131 | ||
4befb867 JH |
3132 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
3133 | { | |
3134 | int err; | |
3135 | ||
3136 | BT_DBG("chan %p", chan); | |
3137 | ||
3138 | err = smp_sig_channel(chan, skb); | |
3139 | if (err) { | |
b68fda68 | 3140 | struct smp_chan *smp = chan->data; |
4befb867 | 3141 | |
b68fda68 JH |
3142 | if (smp) |
3143 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 3144 | |
1e91c29e | 3145 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
3146 | } |
3147 | ||
3148 | return err; | |
3149 | } | |
3150 | ||
70db83c4 JH |
3151 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
3152 | unsigned long hdr_len, | |
3153 | unsigned long len, int nb) | |
3154 | { | |
3155 | struct sk_buff *skb; | |
3156 | ||
3157 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
3158 | if (!skb) | |
3159 | return ERR_PTR(-ENOMEM); | |
3160 | ||
3161 | skb->priority = HCI_PRIO_MAX; | |
a4368ff3 | 3162 | bt_cb(skb)->l2cap.chan = chan; |
70db83c4 JH |
3163 | |
3164 | return skb; | |
3165 | } | |
3166 | ||
3167 | static const struct l2cap_ops smp_chan_ops = { | |
3168 | .name = "Security Manager", | |
3169 | .ready = smp_ready_cb, | |
5d88cc73 | 3170 | .recv = smp_recv_cb, |
70db83c4 JH |
3171 | .alloc_skb = smp_alloc_skb_cb, |
3172 | .teardown = smp_teardown_cb, | |
44f1a7ab | 3173 | .resume = smp_resume_cb, |
70db83c4 JH |
3174 | |
3175 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
3176 | .state_change = l2cap_chan_no_state_change, |
3177 | .close = l2cap_chan_no_close, | |
3178 | .defer = l2cap_chan_no_defer, | |
3179 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
3180 | .set_shutdown = l2cap_chan_no_set_shutdown, |
3181 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3182 | }; |
3183 | ||
3184 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
3185 | { | |
3186 | struct l2cap_chan *chan; | |
3187 | ||
3188 | BT_DBG("pchan %p", pchan); | |
3189 | ||
3190 | chan = l2cap_chan_create(); | |
3191 | if (!chan) | |
3192 | return NULL; | |
3193 | ||
3194 | chan->chan_type = pchan->chan_type; | |
3195 | chan->ops = &smp_chan_ops; | |
3196 | chan->scid = pchan->scid; | |
3197 | chan->dcid = chan->scid; | |
3198 | chan->imtu = pchan->imtu; | |
3199 | chan->omtu = pchan->omtu; | |
3200 | chan->mode = pchan->mode; | |
3201 | ||
abe84903 JH |
3202 | /* Other L2CAP channels may request SMP routines in order to |
3203 | * change the security level. This means that the SMP channel | |
3204 | * lock must be considered in its own category to avoid lockdep | |
3205 | * warnings. | |
3206 | */ | |
3207 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
3208 | ||
70db83c4 JH |
3209 | BT_DBG("created chan %p", chan); |
3210 | ||
3211 | return chan; | |
3212 | } | |
3213 | ||
3214 | static const struct l2cap_ops smp_root_chan_ops = { | |
3215 | .name = "Security Manager Root", | |
3216 | .new_connection = smp_new_conn_cb, | |
3217 | ||
3218 | /* None of these are implemented for the root channel */ | |
3219 | .close = l2cap_chan_no_close, | |
3220 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
3221 | .recv = l2cap_chan_no_recv, | |
3222 | .state_change = l2cap_chan_no_state_change, | |
3223 | .teardown = l2cap_chan_no_teardown, | |
3224 | .ready = l2cap_chan_no_ready, | |
3225 | .defer = l2cap_chan_no_defer, | |
3226 | .suspend = l2cap_chan_no_suspend, | |
3227 | .resume = l2cap_chan_no_resume, | |
3228 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
3229 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3230 | }; |
3231 | ||
ef8efe4b | 3232 | static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) |
711eafe3 | 3233 | { |
70db83c4 | 3234 | struct l2cap_chan *chan; |
88a479d9 | 3235 | struct smp_dev *smp; |
a4770e11 | 3236 | struct crypto_cipher *tfm_aes; |
71af2f6b | 3237 | struct crypto_shash *tfm_cmac; |
47eb2ac8 | 3238 | struct crypto_kpp *tfm_ecdh; |
70db83c4 | 3239 | |
ef8efe4b | 3240 | if (cid == L2CAP_CID_SMP_BREDR) { |
88a479d9 | 3241 | smp = NULL; |
ef8efe4b JH |
3242 | goto create_chan; |
3243 | } | |
711eafe3 | 3244 | |
88a479d9 MH |
3245 | smp = kzalloc(sizeof(*smp), GFP_KERNEL); |
3246 | if (!smp) | |
3247 | return ERR_PTR(-ENOMEM); | |
3248 | ||
a4770e11 | 3249 | tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
defce9e8 | 3250 | if (IS_ERR(tfm_aes)) { |
a4770e11 | 3251 | BT_ERR("Unable to create AES crypto context"); |
88a479d9 | 3252 | kzfree(smp); |
fe700771 | 3253 | return ERR_CAST(tfm_aes); |
711eafe3 JH |
3254 | } |
3255 | ||
71af2f6b | 3256 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
6e2dc6d1 MH |
3257 | if (IS_ERR(tfm_cmac)) { |
3258 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 3259 | crypto_free_cipher(tfm_aes); |
6e2dc6d1 MH |
3260 | kzfree(smp); |
3261 | return ERR_CAST(tfm_cmac); | |
3262 | } | |
3263 | ||
47eb2ac8 TA |
3264 | tfm_ecdh = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0); |
3265 | if (IS_ERR(tfm_ecdh)) { | |
3266 | BT_ERR("Unable to create ECDH crypto context"); | |
3267 | crypto_free_shash(tfm_cmac); | |
3268 | crypto_free_cipher(tfm_aes); | |
3269 | kzfree(smp); | |
3270 | return ERR_CAST(tfm_ecdh); | |
3271 | } | |
3272 | ||
2059cce1 | 3273 | smp->local_oob = false; |
88a479d9 | 3274 | smp->tfm_aes = tfm_aes; |
6e2dc6d1 | 3275 | smp->tfm_cmac = tfm_cmac; |
47eb2ac8 | 3276 | smp->tfm_ecdh = tfm_ecdh; |
88a479d9 | 3277 | |
ef8efe4b | 3278 | create_chan: |
70db83c4 JH |
3279 | chan = l2cap_chan_create(); |
3280 | if (!chan) { | |
63511f6d | 3281 | if (smp) { |
a4770e11 | 3282 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 3283 | crypto_free_shash(smp->tfm_cmac); |
47eb2ac8 | 3284 | crypto_free_kpp(smp->tfm_ecdh); |
63511f6d MH |
3285 | kzfree(smp); |
3286 | } | |
ef8efe4b | 3287 | return ERR_PTR(-ENOMEM); |
70db83c4 JH |
3288 | } |
3289 | ||
88a479d9 | 3290 | chan->data = smp; |
defce9e8 | 3291 | |
ef8efe4b | 3292 | l2cap_add_scid(chan, cid); |
70db83c4 JH |
3293 | |
3294 | l2cap_chan_set_defaults(chan); | |
3295 | ||
157029ba | 3296 | if (cid == L2CAP_CID_SMP) { |
39e3e744 JH |
3297 | u8 bdaddr_type; |
3298 | ||
3299 | hci_copy_identity_address(hdev, &chan->src, &bdaddr_type); | |
3300 | ||
3301 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) | |
157029ba | 3302 | chan->src_type = BDADDR_LE_PUBLIC; |
39e3e744 JH |
3303 | else |
3304 | chan->src_type = BDADDR_LE_RANDOM; | |
157029ba MH |
3305 | } else { |
3306 | bacpy(&chan->src, &hdev->bdaddr); | |
ef8efe4b | 3307 | chan->src_type = BDADDR_BREDR; |
157029ba MH |
3308 | } |
3309 | ||
70db83c4 JH |
3310 | chan->state = BT_LISTEN; |
3311 | chan->mode = L2CAP_MODE_BASIC; | |
3312 | chan->imtu = L2CAP_DEFAULT_MTU; | |
3313 | chan->ops = &smp_root_chan_ops; | |
3314 | ||
abe84903 JH |
3315 | /* Set correct nesting level for a parent/listening channel */ |
3316 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
3317 | ||
ef8efe4b | 3318 | return chan; |
711eafe3 JH |
3319 | } |
3320 | ||
ef8efe4b | 3321 | static void smp_del_chan(struct l2cap_chan *chan) |
711eafe3 | 3322 | { |
88a479d9 | 3323 | struct smp_dev *smp; |
70db83c4 | 3324 | |
ef8efe4b | 3325 | BT_DBG("chan %p", chan); |
711eafe3 | 3326 | |
88a479d9 MH |
3327 | smp = chan->data; |
3328 | if (smp) { | |
defce9e8 | 3329 | chan->data = NULL; |
a4770e11 | 3330 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 3331 | crypto_free_shash(smp->tfm_cmac); |
47eb2ac8 | 3332 | crypto_free_kpp(smp->tfm_ecdh); |
88a479d9 | 3333 | kzfree(smp); |
711eafe3 | 3334 | } |
70db83c4 | 3335 | |
70db83c4 | 3336 | l2cap_chan_put(chan); |
711eafe3 | 3337 | } |
ef8efe4b | 3338 | |
300acfde MH |
3339 | static ssize_t force_bredr_smp_read(struct file *file, |
3340 | char __user *user_buf, | |
3341 | size_t count, loff_t *ppos) | |
3342 | { | |
3343 | struct hci_dev *hdev = file->private_data; | |
3344 | char buf[3]; | |
3345 | ||
b7cb93e5 | 3346 | buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; |
300acfde MH |
3347 | buf[1] = '\n'; |
3348 | buf[2] = '\0'; | |
3349 | return simple_read_from_buffer(user_buf, count, ppos, buf, 2); | |
3350 | } | |
3351 | ||
3352 | static ssize_t force_bredr_smp_write(struct file *file, | |
3353 | const char __user *user_buf, | |
3354 | size_t count, loff_t *ppos) | |
3355 | { | |
3356 | struct hci_dev *hdev = file->private_data; | |
3357 | char buf[32]; | |
3358 | size_t buf_size = min(count, (sizeof(buf)-1)); | |
3359 | bool enable; | |
3360 | ||
3361 | if (copy_from_user(buf, user_buf, buf_size)) | |
3362 | return -EFAULT; | |
3363 | ||
3364 | buf[buf_size] = '\0'; | |
3365 | if (strtobool(buf, &enable)) | |
3366 | return -EINVAL; | |
3367 | ||
b7cb93e5 | 3368 | if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
300acfde MH |
3369 | return -EALREADY; |
3370 | ||
3371 | if (enable) { | |
3372 | struct l2cap_chan *chan; | |
3373 | ||
3374 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); | |
3375 | if (IS_ERR(chan)) | |
3376 | return PTR_ERR(chan); | |
3377 | ||
3378 | hdev->smp_bredr_data = chan; | |
3379 | } else { | |
3380 | struct l2cap_chan *chan; | |
3381 | ||
3382 | chan = hdev->smp_bredr_data; | |
3383 | hdev->smp_bredr_data = NULL; | |
3384 | smp_del_chan(chan); | |
3385 | } | |
3386 | ||
b7cb93e5 | 3387 | hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); |
300acfde MH |
3388 | |
3389 | return count; | |
3390 | } | |
3391 | ||
3392 | static const struct file_operations force_bredr_smp_fops = { | |
3393 | .open = simple_open, | |
3394 | .read = force_bredr_smp_read, | |
3395 | .write = force_bredr_smp_write, | |
3396 | .llseek = default_llseek, | |
3397 | }; | |
3398 | ||
b1f663c9 JH |
3399 | static ssize_t le_min_key_size_read(struct file *file, |
3400 | char __user *user_buf, | |
3401 | size_t count, loff_t *ppos) | |
3402 | { | |
3403 | struct hci_dev *hdev = file->private_data; | |
3404 | char buf[4]; | |
3405 | ||
84ebc60a | 3406 | snprintf(buf, sizeof(buf), "%2u\n", hdev->le_min_key_size); |
b1f663c9 JH |
3407 | |
3408 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3409 | } | |
3410 | ||
3411 | static ssize_t le_min_key_size_write(struct file *file, | |
3412 | const char __user *user_buf, | |
3413 | size_t count, loff_t *ppos) | |
3414 | { | |
3415 | struct hci_dev *hdev = file->private_data; | |
3416 | char buf[32]; | |
3417 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3418 | u8 key_size; | |
3419 | ||
3420 | if (copy_from_user(buf, user_buf, buf_size)) | |
3421 | return -EFAULT; | |
3422 | ||
3423 | buf[buf_size] = '\0'; | |
3424 | ||
3425 | sscanf(buf, "%hhu", &key_size); | |
3426 | ||
84ebc60a | 3427 | if (key_size > hdev->le_max_key_size || |
b1f663c9 JH |
3428 | key_size < SMP_MIN_ENC_KEY_SIZE) |
3429 | return -EINVAL; | |
3430 | ||
84ebc60a | 3431 | hdev->le_min_key_size = key_size; |
b1f663c9 JH |
3432 | |
3433 | return count; | |
3434 | } | |
3435 | ||
3436 | static const struct file_operations le_min_key_size_fops = { | |
3437 | .open = simple_open, | |
3438 | .read = le_min_key_size_read, | |
3439 | .write = le_min_key_size_write, | |
3440 | .llseek = default_llseek, | |
3441 | }; | |
3442 | ||
2fd36558 JH |
3443 | static ssize_t le_max_key_size_read(struct file *file, |
3444 | char __user *user_buf, | |
3445 | size_t count, loff_t *ppos) | |
3446 | { | |
3447 | struct hci_dev *hdev = file->private_data; | |
3448 | char buf[4]; | |
3449 | ||
84ebc60a | 3450 | snprintf(buf, sizeof(buf), "%2u\n", hdev->le_max_key_size); |
2fd36558 JH |
3451 | |
3452 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3453 | } | |
3454 | ||
3455 | static ssize_t le_max_key_size_write(struct file *file, | |
3456 | const char __user *user_buf, | |
3457 | size_t count, loff_t *ppos) | |
3458 | { | |
3459 | struct hci_dev *hdev = file->private_data; | |
3460 | char buf[32]; | |
3461 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3462 | u8 key_size; | |
3463 | ||
3464 | if (copy_from_user(buf, user_buf, buf_size)) | |
3465 | return -EFAULT; | |
3466 | ||
3467 | buf[buf_size] = '\0'; | |
3468 | ||
3469 | sscanf(buf, "%hhu", &key_size); | |
3470 | ||
b1f663c9 | 3471 | if (key_size > SMP_MAX_ENC_KEY_SIZE || |
84ebc60a | 3472 | key_size < hdev->le_min_key_size) |
2fd36558 JH |
3473 | return -EINVAL; |
3474 | ||
84ebc60a | 3475 | hdev->le_max_key_size = key_size; |
2fd36558 JH |
3476 | |
3477 | return count; | |
3478 | } | |
3479 | ||
3480 | static const struct file_operations le_max_key_size_fops = { | |
3481 | .open = simple_open, | |
3482 | .read = le_max_key_size_read, | |
3483 | .write = le_max_key_size_write, | |
3484 | .llseek = default_llseek, | |
3485 | }; | |
3486 | ||
ef8efe4b JH |
3487 | int smp_register(struct hci_dev *hdev) |
3488 | { | |
3489 | struct l2cap_chan *chan; | |
3490 | ||
3491 | BT_DBG("%s", hdev->name); | |
3492 | ||
7e7ec445 MH |
3493 | /* If the controller does not support Low Energy operation, then |
3494 | * there is also no need to register any SMP channel. | |
3495 | */ | |
3496 | if (!lmp_le_capable(hdev)) | |
3497 | return 0; | |
3498 | ||
2b8df323 MH |
3499 | if (WARN_ON(hdev->smp_data)) { |
3500 | chan = hdev->smp_data; | |
3501 | hdev->smp_data = NULL; | |
3502 | smp_del_chan(chan); | |
3503 | } | |
3504 | ||
ef8efe4b JH |
3505 | chan = smp_add_cid(hdev, L2CAP_CID_SMP); |
3506 | if (IS_ERR(chan)) | |
3507 | return PTR_ERR(chan); | |
3508 | ||
3509 | hdev->smp_data = chan; | |
3510 | ||
b1f663c9 JH |
3511 | debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev, |
3512 | &le_min_key_size_fops); | |
2fd36558 JH |
3513 | debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev, |
3514 | &le_max_key_size_fops); | |
3515 | ||
300acfde MH |
3516 | /* If the controller does not support BR/EDR Secure Connections |
3517 | * feature, then the BR/EDR SMP channel shall not be present. | |
3518 | * | |
3519 | * To test this with Bluetooth 4.0 controllers, create a debugfs | |
3520 | * switch that allows forcing BR/EDR SMP support and accepting | |
3521 | * cross-transport pairing on non-AES encrypted connections. | |
3522 | */ | |
3523 | if (!lmp_sc_capable(hdev)) { | |
3524 | debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, | |
3525 | hdev, &force_bredr_smp_fops); | |
83ebb9ec SJ |
3526 | |
3527 | /* Flag can be already set here (due to power toggle) */ | |
3528 | if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) | |
3529 | return 0; | |
300acfde | 3530 | } |
ef8efe4b | 3531 | |
2b8df323 MH |
3532 | if (WARN_ON(hdev->smp_bredr_data)) { |
3533 | chan = hdev->smp_bredr_data; | |
3534 | hdev->smp_bredr_data = NULL; | |
3535 | smp_del_chan(chan); | |
3536 | } | |
3537 | ||
ef8efe4b JH |
3538 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); |
3539 | if (IS_ERR(chan)) { | |
3540 | int err = PTR_ERR(chan); | |
3541 | chan = hdev->smp_data; | |
3542 | hdev->smp_data = NULL; | |
3543 | smp_del_chan(chan); | |
3544 | return err; | |
3545 | } | |
3546 | ||
3547 | hdev->smp_bredr_data = chan; | |
3548 | ||
3549 | return 0; | |
3550 | } | |
3551 | ||
3552 | void smp_unregister(struct hci_dev *hdev) | |
3553 | { | |
3554 | struct l2cap_chan *chan; | |
3555 | ||
3556 | if (hdev->smp_bredr_data) { | |
3557 | chan = hdev->smp_bredr_data; | |
3558 | hdev->smp_bredr_data = NULL; | |
3559 | smp_del_chan(chan); | |
3560 | } | |
3561 | ||
3562 | if (hdev->smp_data) { | |
3563 | chan = hdev->smp_data; | |
3564 | hdev->smp_data = NULL; | |
3565 | smp_del_chan(chan); | |
3566 | } | |
3567 | } | |
0a2b0f04 JH |
3568 | |
3569 | #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP) | |
3570 | ||
47eb2ac8 | 3571 | static int __init test_debug_key(struct crypto_kpp *tfm_ecdh) |
71653eb6 | 3572 | { |
c0153b0b | 3573 | u8 pk[64]; |
a2976416 | 3574 | int err; |
71653eb6 | 3575 | |
c0153b0b | 3576 | err = set_ecdh_privkey(tfm_ecdh, debug_sk); |
a2976416 TA |
3577 | if (err) |
3578 | return err; | |
71653eb6 | 3579 | |
c0153b0b TA |
3580 | err = generate_ecdh_public_key(tfm_ecdh, pk); |
3581 | if (err) | |
3582 | return err; | |
71653eb6 | 3583 | |
329d8230 | 3584 | if (crypto_memneq(pk, debug_pk, 64)) |
71653eb6 MH |
3585 | return -EINVAL; |
3586 | ||
3587 | return 0; | |
3588 | } | |
3589 | ||
a4770e11 | 3590 | static int __init test_ah(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3591 | { |
3592 | const u8 irk[16] = { | |
3593 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3594 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3595 | const u8 r[3] = { 0x94, 0x81, 0x70 }; | |
3596 | const u8 exp[3] = { 0xaa, 0xfb, 0x0d }; | |
3597 | u8 res[3]; | |
3598 | int err; | |
3599 | ||
3600 | err = smp_ah(tfm_aes, irk, r, res); | |
3601 | if (err) | |
3602 | return err; | |
3603 | ||
329d8230 | 3604 | if (crypto_memneq(res, exp, 3)) |
cfc4198e JH |
3605 | return -EINVAL; |
3606 | ||
3607 | return 0; | |
3608 | } | |
3609 | ||
a4770e11 | 3610 | static int __init test_c1(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3611 | { |
3612 | const u8 k[16] = { | |
3613 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3614 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3615 | const u8 r[16] = { | |
3616 | 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63, | |
3617 | 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 }; | |
3618 | const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 }; | |
3619 | const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 }; | |
3620 | const u8 _iat = 0x01; | |
3621 | const u8 _rat = 0x00; | |
3622 | const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } }; | |
3623 | const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } }; | |
3624 | const u8 exp[16] = { | |
3625 | 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2, | |
3626 | 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e }; | |
3627 | u8 res[16]; | |
3628 | int err; | |
3629 | ||
3630 | err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res); | |
3631 | if (err) | |
3632 | return err; | |
3633 | ||
329d8230 | 3634 | if (crypto_memneq(res, exp, 16)) |
cfc4198e JH |
3635 | return -EINVAL; |
3636 | ||
3637 | return 0; | |
3638 | } | |
3639 | ||
a4770e11 | 3640 | static int __init test_s1(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3641 | { |
3642 | const u8 k[16] = { | |
3643 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3644 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3645 | const u8 r1[16] = { | |
3646 | 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }; | |
3647 | const u8 r2[16] = { | |
3648 | 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 }; | |
3649 | const u8 exp[16] = { | |
3650 | 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b, | |
3651 | 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a }; | |
3652 | u8 res[16]; | |
3653 | int err; | |
3654 | ||
3655 | err = smp_s1(tfm_aes, k, r1, r2, res); | |
3656 | if (err) | |
3657 | return err; | |
3658 | ||
329d8230 | 3659 | if (crypto_memneq(res, exp, 16)) |
cfc4198e JH |
3660 | return -EINVAL; |
3661 | ||
3662 | return 0; | |
3663 | } | |
3664 | ||
71af2f6b | 3665 | static int __init test_f4(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3666 | { |
3667 | const u8 u[32] = { | |
3668 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3669 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3670 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3671 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3672 | const u8 v[32] = { | |
3673 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3674 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3675 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3676 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3677 | const u8 x[16] = { | |
3678 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3679 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3680 | const u8 z = 0x00; | |
3681 | const u8 exp[16] = { | |
3682 | 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1, | |
3683 | 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 }; | |
3684 | u8 res[16]; | |
3685 | int err; | |
3686 | ||
3687 | err = smp_f4(tfm_cmac, u, v, x, z, res); | |
3688 | if (err) | |
3689 | return err; | |
3690 | ||
329d8230 | 3691 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3692 | return -EINVAL; |
3693 | ||
3694 | return 0; | |
3695 | } | |
3696 | ||
71af2f6b | 3697 | static int __init test_f5(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3698 | { |
3699 | const u8 w[32] = { | |
3700 | 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86, | |
3701 | 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99, | |
3702 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3703 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3704 | const u8 n1[16] = { | |
3705 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3706 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3707 | const u8 n2[16] = { | |
3708 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3709 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3710 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3711 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3712 | const u8 exp_ltk[16] = { | |
3713 | 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98, | |
3714 | 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 }; | |
3715 | const u8 exp_mackey[16] = { | |
3716 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3717 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3718 | u8 mackey[16], ltk[16]; | |
3719 | int err; | |
3720 | ||
3721 | err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk); | |
3722 | if (err) | |
3723 | return err; | |
3724 | ||
329d8230 | 3725 | if (crypto_memneq(mackey, exp_mackey, 16)) |
fb2969a3 JH |
3726 | return -EINVAL; |
3727 | ||
329d8230 | 3728 | if (crypto_memneq(ltk, exp_ltk, 16)) |
fb2969a3 JH |
3729 | return -EINVAL; |
3730 | ||
3731 | return 0; | |
3732 | } | |
3733 | ||
71af2f6b | 3734 | static int __init test_f6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3735 | { |
3736 | const u8 w[16] = { | |
3737 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3738 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3739 | const u8 n1[16] = { | |
3740 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3741 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3742 | const u8 n2[16] = { | |
3743 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3744 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3745 | const u8 r[16] = { | |
3746 | 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08, | |
3747 | 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 }; | |
3748 | const u8 io_cap[3] = { 0x02, 0x01, 0x01 }; | |
3749 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3750 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3751 | const u8 exp[16] = { | |
3752 | 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2, | |
3753 | 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 }; | |
3754 | u8 res[16]; | |
3755 | int err; | |
3756 | ||
3757 | err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res); | |
3758 | if (err) | |
3759 | return err; | |
3760 | ||
329d8230 | 3761 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3762 | return -EINVAL; |
3763 | ||
3764 | return 0; | |
3765 | } | |
3766 | ||
71af2f6b | 3767 | static int __init test_g2(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3768 | { |
3769 | const u8 u[32] = { | |
3770 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3771 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3772 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3773 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3774 | const u8 v[32] = { | |
3775 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3776 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3777 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3778 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3779 | const u8 x[16] = { | |
3780 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3781 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3782 | const u8 y[16] = { | |
3783 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3784 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3785 | const u32 exp_val = 0x2f9ed5ba % 1000000; | |
3786 | u32 val; | |
3787 | int err; | |
3788 | ||
3789 | err = smp_g2(tfm_cmac, u, v, x, y, &val); | |
3790 | if (err) | |
3791 | return err; | |
3792 | ||
3793 | if (val != exp_val) | |
3794 | return -EINVAL; | |
3795 | ||
3796 | return 0; | |
3797 | } | |
3798 | ||
71af2f6b | 3799 | static int __init test_h6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3800 | { |
3801 | const u8 w[16] = { | |
3802 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3803 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3804 | const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
3805 | const u8 exp[16] = { | |
3806 | 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8, | |
3807 | 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d }; | |
3808 | u8 res[16]; | |
3809 | int err; | |
3810 | ||
3811 | err = smp_h6(tfm_cmac, w, key_id, res); | |
3812 | if (err) | |
3813 | return err; | |
3814 | ||
329d8230 | 3815 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3816 | return -EINVAL; |
3817 | ||
3818 | return 0; | |
3819 | } | |
3820 | ||
64dd374e MH |
3821 | static char test_smp_buffer[32]; |
3822 | ||
3823 | static ssize_t test_smp_read(struct file *file, char __user *user_buf, | |
3824 | size_t count, loff_t *ppos) | |
3825 | { | |
3826 | return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer, | |
3827 | strlen(test_smp_buffer)); | |
3828 | } | |
3829 | ||
3830 | static const struct file_operations test_smp_fops = { | |
3831 | .open = simple_open, | |
3832 | .read = test_smp_read, | |
3833 | .llseek = default_llseek, | |
3834 | }; | |
3835 | ||
a4770e11 | 3836 | static int __init run_selftests(struct crypto_cipher *tfm_aes, |
47eb2ac8 TA |
3837 | struct crypto_shash *tfm_cmac, |
3838 | struct crypto_kpp *tfm_ecdh) | |
0a2b0f04 | 3839 | { |
255047b0 MH |
3840 | ktime_t calltime, delta, rettime; |
3841 | unsigned long long duration; | |
cfc4198e JH |
3842 | int err; |
3843 | ||
255047b0 MH |
3844 | calltime = ktime_get(); |
3845 | ||
47eb2ac8 | 3846 | err = test_debug_key(tfm_ecdh); |
71653eb6 MH |
3847 | if (err) { |
3848 | BT_ERR("debug_key test failed"); | |
3849 | goto done; | |
3850 | } | |
3851 | ||
cfc4198e JH |
3852 | err = test_ah(tfm_aes); |
3853 | if (err) { | |
3854 | BT_ERR("smp_ah test failed"); | |
64dd374e | 3855 | goto done; |
cfc4198e JH |
3856 | } |
3857 | ||
3858 | err = test_c1(tfm_aes); | |
3859 | if (err) { | |
3860 | BT_ERR("smp_c1 test failed"); | |
64dd374e | 3861 | goto done; |
cfc4198e JH |
3862 | } |
3863 | ||
3864 | err = test_s1(tfm_aes); | |
3865 | if (err) { | |
3866 | BT_ERR("smp_s1 test failed"); | |
64dd374e | 3867 | goto done; |
cfc4198e JH |
3868 | } |
3869 | ||
fb2969a3 JH |
3870 | err = test_f4(tfm_cmac); |
3871 | if (err) { | |
3872 | BT_ERR("smp_f4 test failed"); | |
64dd374e | 3873 | goto done; |
fb2969a3 JH |
3874 | } |
3875 | ||
3876 | err = test_f5(tfm_cmac); | |
3877 | if (err) { | |
3878 | BT_ERR("smp_f5 test failed"); | |
64dd374e | 3879 | goto done; |
fb2969a3 JH |
3880 | } |
3881 | ||
3882 | err = test_f6(tfm_cmac); | |
3883 | if (err) { | |
3884 | BT_ERR("smp_f6 test failed"); | |
64dd374e | 3885 | goto done; |
fb2969a3 JH |
3886 | } |
3887 | ||
3888 | err = test_g2(tfm_cmac); | |
3889 | if (err) { | |
3890 | BT_ERR("smp_g2 test failed"); | |
64dd374e | 3891 | goto done; |
fb2969a3 JH |
3892 | } |
3893 | ||
3894 | err = test_h6(tfm_cmac); | |
3895 | if (err) { | |
3896 | BT_ERR("smp_h6 test failed"); | |
64dd374e | 3897 | goto done; |
fb2969a3 JH |
3898 | } |
3899 | ||
255047b0 MH |
3900 | rettime = ktime_get(); |
3901 | delta = ktime_sub(rettime, calltime); | |
3902 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
3903 | ||
5ced2464 | 3904 | BT_INFO("SMP test passed in %llu usecs", duration); |
0a2b0f04 | 3905 | |
64dd374e MH |
3906 | done: |
3907 | if (!err) | |
3908 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), | |
3909 | "PASS (%llu usecs)\n", duration); | |
3910 | else | |
3911 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n"); | |
3912 | ||
3913 | debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL, | |
3914 | &test_smp_fops); | |
3915 | ||
3916 | return err; | |
0a2b0f04 JH |
3917 | } |
3918 | ||
3919 | int __init bt_selftest_smp(void) | |
3920 | { | |
a4770e11 | 3921 | struct crypto_cipher *tfm_aes; |
71af2f6b | 3922 | struct crypto_shash *tfm_cmac; |
47eb2ac8 | 3923 | struct crypto_kpp *tfm_ecdh; |
0a2b0f04 JH |
3924 | int err; |
3925 | ||
a4770e11 | 3926 | tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 | 3927 | if (IS_ERR(tfm_aes)) { |
a4770e11 | 3928 | BT_ERR("Unable to create AES crypto context"); |
0a2b0f04 JH |
3929 | return PTR_ERR(tfm_aes); |
3930 | } | |
3931 | ||
71af2f6b | 3932 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 JH |
3933 | if (IS_ERR(tfm_cmac)) { |
3934 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 3935 | crypto_free_cipher(tfm_aes); |
0a2b0f04 JH |
3936 | return PTR_ERR(tfm_cmac); |
3937 | } | |
3938 | ||
47eb2ac8 TA |
3939 | tfm_ecdh = crypto_alloc_kpp("ecdh", CRYPTO_ALG_INTERNAL, 0); |
3940 | if (IS_ERR(tfm_ecdh)) { | |
3941 | BT_ERR("Unable to create ECDH crypto context"); | |
3942 | crypto_free_shash(tfm_cmac); | |
3943 | crypto_free_cipher(tfm_aes); | |
3944 | return PTR_ERR(tfm_ecdh); | |
3945 | } | |
3946 | ||
3947 | err = run_selftests(tfm_aes, tfm_cmac, tfm_ecdh); | |
0a2b0f04 | 3948 | |
71af2f6b | 3949 | crypto_free_shash(tfm_cmac); |
a4770e11 | 3950 | crypto_free_cipher(tfm_aes); |
47eb2ac8 | 3951 | crypto_free_kpp(tfm_ecdh); |
0a2b0f04 JH |
3952 | |
3953 | return err; | |
3954 | } | |
3955 | ||
3956 | #endif |