Commit | Line | Data |
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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
300acfde | 23 | #include <linux/debugfs.h> |
8c520a59 | 24 | #include <linux/scatterlist.h> |
a4770e11 | 25 | #include <linux/crypto.h> |
329d8230 | 26 | #include <crypto/algapi.h> |
8c520a59 | 27 | #include <crypto/b128ops.h> |
71af2f6b | 28 | #include <crypto/hash.h> |
8c520a59 | 29 | |
eb492e01 AB |
30 | #include <net/bluetooth/bluetooth.h> |
31 | #include <net/bluetooth/hci_core.h> | |
32 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 33 | #include <net/bluetooth/mgmt.h> |
ac4b7236 | 34 | |
58771c1c | 35 | #include "ecdh_helper.h" |
ac4b7236 | 36 | #include "smp.h" |
d22ef0bc | 37 | |
2fd36558 JH |
38 | #define SMP_DEV(hdev) \ |
39 | ((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data) | |
40 | ||
c7a3d57d JH |
41 | /* Low-level debug macros to be used for stuff that we don't want |
42 | * accidentially in dmesg, i.e. the values of the various crypto keys | |
43 | * and the inputs & outputs of crypto functions. | |
44 | */ | |
45 | #ifdef DEBUG | |
46 | #define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
47 | ##__VA_ARGS__) | |
48 | #else | |
49 | #define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
50 | ##__VA_ARGS__) | |
51 | #endif | |
52 | ||
b28b4943 | 53 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 54 | |
3b19146d JH |
55 | /* Keys which are not distributed with Secure Connections */ |
56 | #define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY); | |
57 | ||
17b02e62 | 58 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 59 | |
d7a5a11d | 60 | #define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \ |
a62da6f1 | 61 | 0x3f : 0x07) |
0edb14de | 62 | #define KEY_DIST_MASK 0x07 |
065a13e2 | 63 | |
cbbbe3e2 JH |
64 | /* Maximum message length that can be passed to aes_cmac */ |
65 | #define CMAC_MSG_MAX 80 | |
66 | ||
533e35d4 JH |
67 | enum { |
68 | SMP_FLAG_TK_VALID, | |
69 | SMP_FLAG_CFM_PENDING, | |
70 | SMP_FLAG_MITM_AUTH, | |
71 | SMP_FLAG_COMPLETE, | |
72 | SMP_FLAG_INITIATOR, | |
65668776 | 73 | SMP_FLAG_SC, |
d8f8edbe | 74 | SMP_FLAG_REMOTE_PK, |
aeb7d461 | 75 | SMP_FLAG_DEBUG_KEY, |
38606f14 | 76 | SMP_FLAG_WAIT_USER, |
d3e54a87 | 77 | SMP_FLAG_DHKEY_PENDING, |
1a8bab4f JH |
78 | SMP_FLAG_REMOTE_OOB, |
79 | SMP_FLAG_LOCAL_OOB, | |
a62da6f1 | 80 | SMP_FLAG_CT2, |
533e35d4 | 81 | }; |
4bc58f51 | 82 | |
88a479d9 | 83 | struct smp_dev { |
60a27d65 MH |
84 | /* Secure Connections OOB data */ |
85 | u8 local_pk[64]; | |
86 | u8 local_sk[32]; | |
fb334fee | 87 | u8 local_rand[16]; |
60a27d65 MH |
88 | bool debug_key; |
89 | ||
b1f663c9 | 90 | u8 min_key_size; |
2fd36558 JH |
91 | u8 max_key_size; |
92 | ||
a4770e11 | 93 | struct crypto_cipher *tfm_aes; |
71af2f6b | 94 | struct crypto_shash *tfm_cmac; |
88a479d9 MH |
95 | }; |
96 | ||
4bc58f51 | 97 | struct smp_chan { |
b68fda68 JH |
98 | struct l2cap_conn *conn; |
99 | struct delayed_work security_timer; | |
b28b4943 | 100 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 101 | |
4bc58f51 JH |
102 | u8 preq[7]; /* SMP Pairing Request */ |
103 | u8 prsp[7]; /* SMP Pairing Response */ | |
104 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
105 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
106 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
107 | u8 tk[16]; /* SMP Temporary Key */ | |
882fafad JH |
108 | u8 rr[16]; /* Remote OOB ra/rb value */ |
109 | u8 lr[16]; /* Local OOB ra/rb value */ | |
4bc58f51 JH |
110 | u8 enc_key_size; |
111 | u8 remote_key_dist; | |
112 | bdaddr_t id_addr; | |
113 | u8 id_addr_type; | |
114 | u8 irk[16]; | |
115 | struct smp_csrk *csrk; | |
116 | struct smp_csrk *slave_csrk; | |
117 | struct smp_ltk *ltk; | |
118 | struct smp_ltk *slave_ltk; | |
119 | struct smp_irk *remote_irk; | |
6a77083a | 120 | u8 *link_key; |
4a74d658 | 121 | unsigned long flags; |
783e0574 | 122 | u8 method; |
38606f14 | 123 | u8 passkey_round; |
6a7bd103 | 124 | |
3b19146d JH |
125 | /* Secure Connections variables */ |
126 | u8 local_pk[64]; | |
127 | u8 local_sk[32]; | |
d8f8edbe JH |
128 | u8 remote_pk[64]; |
129 | u8 dhkey[32]; | |
760b018b | 130 | u8 mackey[16]; |
3b19146d | 131 | |
a4770e11 | 132 | struct crypto_cipher *tfm_aes; |
71af2f6b | 133 | struct crypto_shash *tfm_cmac; |
4bc58f51 JH |
134 | }; |
135 | ||
aeb7d461 JH |
136 | /* These debug key values are defined in the SMP section of the core |
137 | * specification. debug_pk is the public debug key and debug_sk the | |
138 | * private debug key. | |
139 | */ | |
140 | static const u8 debug_pk[64] = { | |
141 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
142 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
143 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
144 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20, | |
145 | ||
146 | 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74, | |
147 | 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76, | |
148 | 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63, | |
149 | 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc, | |
150 | }; | |
151 | ||
152 | static const u8 debug_sk[32] = { | |
153 | 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58, | |
154 | 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a, | |
155 | 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74, | |
156 | 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f, | |
157 | }; | |
158 | ||
8a2936f4 | 159 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 160 | { |
8a2936f4 | 161 | size_t i; |
d22ef0bc | 162 | |
8a2936f4 JH |
163 | for (i = 0; i < len; i++) |
164 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
165 | } |
166 | ||
06edf8de JH |
167 | /* The following functions map to the LE SC SMP crypto functions |
168 | * AES-CMAC, f4, f5, f6, g2 and h6. | |
169 | */ | |
170 | ||
71af2f6b | 171 | static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m, |
cbbbe3e2 JH |
172 | size_t len, u8 mac[16]) |
173 | { | |
174 | uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX]; | |
71af2f6b | 175 | SHASH_DESC_ON_STACK(desc, tfm); |
cbbbe3e2 JH |
176 | int err; |
177 | ||
178 | if (len > CMAC_MSG_MAX) | |
179 | return -EFBIG; | |
180 | ||
181 | if (!tfm) { | |
182 | BT_ERR("tfm %p", tfm); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
71af2f6b HX |
186 | desc->tfm = tfm; |
187 | desc->flags = 0; | |
cbbbe3e2 JH |
188 | |
189 | /* Swap key and message from LSB to MSB */ | |
190 | swap_buf(k, tmp, 16); | |
191 | swap_buf(m, msg_msb, len); | |
192 | ||
c7a3d57d JH |
193 | SMP_DBG("msg (len %zu) %*phN", len, (int) len, m); |
194 | SMP_DBG("key %16phN", k); | |
cbbbe3e2 | 195 | |
71af2f6b | 196 | err = crypto_shash_setkey(tfm, tmp, 16); |
cbbbe3e2 JH |
197 | if (err) { |
198 | BT_ERR("cipher setkey failed: %d", err); | |
199 | return err; | |
200 | } | |
201 | ||
71af2f6b HX |
202 | err = crypto_shash_digest(desc, msg_msb, len, mac_msb); |
203 | shash_desc_zero(desc); | |
cbbbe3e2 | 204 | if (err) { |
71af2f6b | 205 | BT_ERR("Hash computation error %d", err); |
cbbbe3e2 JH |
206 | return err; |
207 | } | |
208 | ||
209 | swap_buf(mac_msb, mac, 16); | |
210 | ||
c7a3d57d | 211 | SMP_DBG("mac %16phN", mac); |
cbbbe3e2 JH |
212 | |
213 | return 0; | |
214 | } | |
215 | ||
71af2f6b HX |
216 | static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32], |
217 | const u8 v[32], const u8 x[16], u8 z, u8 res[16]) | |
cbbbe3e2 JH |
218 | { |
219 | u8 m[65]; | |
220 | int err; | |
221 | ||
c7a3d57d JH |
222 | SMP_DBG("u %32phN", u); |
223 | SMP_DBG("v %32phN", v); | |
224 | SMP_DBG("x %16phN z %02x", x, z); | |
cbbbe3e2 JH |
225 | |
226 | m[0] = z; | |
227 | memcpy(m + 1, v, 32); | |
228 | memcpy(m + 33, u, 32); | |
229 | ||
230 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), res); | |
231 | if (err) | |
232 | return err; | |
233 | ||
c7a3d57d | 234 | SMP_DBG("res %16phN", res); |
cbbbe3e2 JH |
235 | |
236 | return err; | |
237 | } | |
238 | ||
71af2f6b | 239 | static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32], |
4da50de8 JH |
240 | const u8 n1[16], const u8 n2[16], const u8 a1[7], |
241 | const u8 a2[7], u8 mackey[16], u8 ltk[16]) | |
760b018b JH |
242 | { |
243 | /* The btle, salt and length "magic" values are as defined in | |
244 | * the SMP section of the Bluetooth core specification. In ASCII | |
245 | * the btle value ends up being 'btle'. The salt is just a | |
246 | * random number whereas length is the value 256 in little | |
247 | * endian format. | |
248 | */ | |
249 | const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 }; | |
250 | const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60, | |
251 | 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c }; | |
252 | const u8 length[2] = { 0x00, 0x01 }; | |
253 | u8 m[53], t[16]; | |
254 | int err; | |
255 | ||
c7a3d57d JH |
256 | SMP_DBG("w %32phN", w); |
257 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
258 | SMP_DBG("a1 %7phN a2 %7phN", a1, a2); | |
760b018b JH |
259 | |
260 | err = aes_cmac(tfm_cmac, salt, w, 32, t); | |
261 | if (err) | |
262 | return err; | |
263 | ||
c7a3d57d | 264 | SMP_DBG("t %16phN", t); |
760b018b JH |
265 | |
266 | memcpy(m, length, 2); | |
267 | memcpy(m + 2, a2, 7); | |
268 | memcpy(m + 9, a1, 7); | |
269 | memcpy(m + 16, n2, 16); | |
270 | memcpy(m + 32, n1, 16); | |
271 | memcpy(m + 48, btle, 4); | |
272 | ||
273 | m[52] = 0; /* Counter */ | |
274 | ||
275 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey); | |
276 | if (err) | |
277 | return err; | |
278 | ||
c7a3d57d | 279 | SMP_DBG("mackey %16phN", mackey); |
760b018b JH |
280 | |
281 | m[52] = 1; /* Counter */ | |
282 | ||
283 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk); | |
284 | if (err) | |
285 | return err; | |
286 | ||
c7a3d57d | 287 | SMP_DBG("ltk %16phN", ltk); |
760b018b JH |
288 | |
289 | return 0; | |
290 | } | |
291 | ||
71af2f6b | 292 | static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16], |
4da50de8 | 293 | const u8 n1[16], const u8 n2[16], const u8 r[16], |
760b018b JH |
294 | const u8 io_cap[3], const u8 a1[7], const u8 a2[7], |
295 | u8 res[16]) | |
296 | { | |
297 | u8 m[65]; | |
298 | int err; | |
299 | ||
c7a3d57d JH |
300 | SMP_DBG("w %16phN", w); |
301 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
302 | SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2); | |
760b018b JH |
303 | |
304 | memcpy(m, a2, 7); | |
305 | memcpy(m + 7, a1, 7); | |
306 | memcpy(m + 14, io_cap, 3); | |
307 | memcpy(m + 17, r, 16); | |
308 | memcpy(m + 33, n2, 16); | |
309 | memcpy(m + 49, n1, 16); | |
310 | ||
311 | err = aes_cmac(tfm_cmac, w, m, sizeof(m), res); | |
312 | if (err) | |
313 | return err; | |
314 | ||
203de21b | 315 | SMP_DBG("res %16phN", res); |
760b018b JH |
316 | |
317 | return err; | |
318 | } | |
319 | ||
71af2f6b | 320 | static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32], |
191dc7fe JH |
321 | const u8 x[16], const u8 y[16], u32 *val) |
322 | { | |
323 | u8 m[80], tmp[16]; | |
324 | int err; | |
325 | ||
c7a3d57d JH |
326 | SMP_DBG("u %32phN", u); |
327 | SMP_DBG("v %32phN", v); | |
328 | SMP_DBG("x %16phN y %16phN", x, y); | |
191dc7fe JH |
329 | |
330 | memcpy(m, y, 16); | |
331 | memcpy(m + 16, v, 32); | |
332 | memcpy(m + 48, u, 32); | |
333 | ||
334 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp); | |
335 | if (err) | |
336 | return err; | |
337 | ||
338 | *val = get_unaligned_le32(tmp); | |
339 | *val %= 1000000; | |
340 | ||
c7a3d57d | 341 | SMP_DBG("val %06u", *val); |
191dc7fe JH |
342 | |
343 | return 0; | |
344 | } | |
345 | ||
71af2f6b | 346 | static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16], |
06edf8de JH |
347 | const u8 key_id[4], u8 res[16]) |
348 | { | |
349 | int err; | |
350 | ||
351 | SMP_DBG("w %16phN key_id %4phN", w, key_id); | |
352 | ||
353 | err = aes_cmac(tfm_cmac, w, key_id, 4, res); | |
354 | if (err) | |
355 | return err; | |
356 | ||
357 | SMP_DBG("res %16phN", res); | |
358 | ||
359 | return err; | |
360 | } | |
361 | ||
a62da6f1 JH |
362 | static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16], |
363 | const u8 salt[16], u8 res[16]) | |
364 | { | |
365 | int err; | |
366 | ||
367 | SMP_DBG("w %16phN salt %16phN", w, salt); | |
368 | ||
369 | err = aes_cmac(tfm_cmac, salt, w, 16, res); | |
370 | if (err) | |
371 | return err; | |
372 | ||
373 | SMP_DBG("res %16phN", res); | |
374 | ||
375 | return err; | |
376 | } | |
377 | ||
06edf8de JH |
378 | /* The following functions map to the legacy SMP crypto functions e, c1, |
379 | * s1 and ah. | |
380 | */ | |
381 | ||
a4770e11 | 382 | static int smp_e(struct crypto_cipher *tfm, const u8 *k, u8 *r) |
d22ef0bc | 383 | { |
943a732a | 384 | uint8_t tmp[16], data[16]; |
201a5929 | 385 | int err; |
d22ef0bc | 386 | |
011c391a JH |
387 | SMP_DBG("k %16phN r %16phN", k, r); |
388 | ||
7f376cd6 | 389 | if (!tfm) { |
d22ef0bc AB |
390 | BT_ERR("tfm %p", tfm); |
391 | return -EINVAL; | |
392 | } | |
393 | ||
943a732a | 394 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 395 | swap_buf(k, tmp, 16); |
943a732a | 396 | |
a4770e11 | 397 | err = crypto_cipher_setkey(tfm, tmp, 16); |
d22ef0bc AB |
398 | if (err) { |
399 | BT_ERR("cipher setkey failed: %d", err); | |
400 | return err; | |
401 | } | |
402 | ||
943a732a | 403 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 404 | swap_buf(r, data, 16); |
943a732a | 405 | |
a4770e11 | 406 | crypto_cipher_encrypt_one(tfm, data, data); |
d22ef0bc | 407 | |
943a732a | 408 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 409 | swap_buf(data, r, 16); |
943a732a | 410 | |
011c391a JH |
411 | SMP_DBG("r %16phN", r); |
412 | ||
d22ef0bc AB |
413 | return err; |
414 | } | |
415 | ||
a4770e11 | 416 | static int smp_c1(struct crypto_cipher *tfm_aes, const u8 k[16], |
06edf8de JH |
417 | const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat, |
418 | const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16]) | |
6a77083a | 419 | { |
06edf8de | 420 | u8 p1[16], p2[16]; |
6a77083a JH |
421 | int err; |
422 | ||
011c391a JH |
423 | SMP_DBG("k %16phN r %16phN", k, r); |
424 | SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra); | |
425 | SMP_DBG("preq %7phN pres %7phN", preq, pres); | |
426 | ||
06edf8de | 427 | memset(p1, 0, 16); |
6a77083a | 428 | |
06edf8de JH |
429 | /* p1 = pres || preq || _rat || _iat */ |
430 | p1[0] = _iat; | |
431 | p1[1] = _rat; | |
432 | memcpy(p1 + 2, preq, 7); | |
433 | memcpy(p1 + 9, pres, 7); | |
434 | ||
011c391a | 435 | SMP_DBG("p1 %16phN", p1); |
06edf8de JH |
436 | |
437 | /* res = r XOR p1 */ | |
438 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
439 | ||
440 | /* res = e(k, res) */ | |
441 | err = smp_e(tfm_aes, k, res); | |
442 | if (err) { | |
443 | BT_ERR("Encrypt data error"); | |
6a77083a | 444 | return err; |
06edf8de | 445 | } |
6a77083a | 446 | |
011c391a JH |
447 | /* p2 = padding || ia || ra */ |
448 | memcpy(p2, ra, 6); | |
449 | memcpy(p2 + 6, ia, 6); | |
450 | memset(p2 + 12, 0, 4); | |
451 | ||
452 | SMP_DBG("p2 %16phN", p2); | |
453 | ||
06edf8de JH |
454 | /* res = res XOR p2 */ |
455 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
456 | ||
457 | /* res = e(k, res) */ | |
458 | err = smp_e(tfm_aes, k, res); | |
459 | if (err) | |
460 | BT_ERR("Encrypt data error"); | |
461 | ||
462 | return err; | |
463 | } | |
464 | ||
a4770e11 | 465 | static int smp_s1(struct crypto_cipher *tfm_aes, const u8 k[16], |
06edf8de JH |
466 | const u8 r1[16], const u8 r2[16], u8 _r[16]) |
467 | { | |
468 | int err; | |
469 | ||
470 | /* Just least significant octets from r1 and r2 are considered */ | |
471 | memcpy(_r, r2, 8); | |
472 | memcpy(_r + 8, r1, 8); | |
473 | ||
474 | err = smp_e(tfm_aes, k, _r); | |
475 | if (err) | |
476 | BT_ERR("Encrypt data error"); | |
6a77083a JH |
477 | |
478 | return err; | |
479 | } | |
480 | ||
a4770e11 | 481 | static int smp_ah(struct crypto_cipher *tfm, const u8 irk[16], |
cd082797 | 482 | const u8 r[3], u8 res[3]) |
60478054 | 483 | { |
943a732a | 484 | u8 _res[16]; |
60478054 JH |
485 | int err; |
486 | ||
487 | /* r' = padding || r */ | |
943a732a JH |
488 | memcpy(_res, r, 3); |
489 | memset(_res + 3, 0, 13); | |
60478054 | 490 | |
943a732a | 491 | err = smp_e(tfm, irk, _res); |
60478054 JH |
492 | if (err) { |
493 | BT_ERR("Encrypt error"); | |
494 | return err; | |
495 | } | |
496 | ||
497 | /* The output of the random address function ah is: | |
c5080d42 | 498 | * ah(k, r) = e(k, r') mod 2^24 |
60478054 JH |
499 | * The output of the security function e is then truncated to 24 bits |
500 | * by taking the least significant 24 bits of the output of e as the | |
501 | * result of ah. | |
502 | */ | |
943a732a | 503 | memcpy(res, _res, 3); |
60478054 JH |
504 | |
505 | return 0; | |
506 | } | |
507 | ||
cd082797 JH |
508 | bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], |
509 | const bdaddr_t *bdaddr) | |
60478054 | 510 | { |
defce9e8 | 511 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 512 | struct smp_dev *smp; |
60478054 JH |
513 | u8 hash[3]; |
514 | int err; | |
515 | ||
defce9e8 JH |
516 | if (!chan || !chan->data) |
517 | return false; | |
518 | ||
88a479d9 | 519 | smp = chan->data; |
defce9e8 | 520 | |
60478054 JH |
521 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
522 | ||
88a479d9 | 523 | err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash); |
60478054 JH |
524 | if (err) |
525 | return false; | |
526 | ||
329d8230 | 527 | return !crypto_memneq(bdaddr->b, hash, 3); |
60478054 JH |
528 | } |
529 | ||
cd082797 | 530 | int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 531 | { |
defce9e8 | 532 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 533 | struct smp_dev *smp; |
b1e2b3ae JH |
534 | int err; |
535 | ||
defce9e8 JH |
536 | if (!chan || !chan->data) |
537 | return -EOPNOTSUPP; | |
538 | ||
88a479d9 | 539 | smp = chan->data; |
defce9e8 | 540 | |
b1e2b3ae JH |
541 | get_random_bytes(&rpa->b[3], 3); |
542 | ||
543 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
544 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
545 | ||
88a479d9 | 546 | err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b); |
b1e2b3ae JH |
547 | if (err < 0) |
548 | return err; | |
549 | ||
550 | BT_DBG("RPA %pMR", rpa); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
60a27d65 MH |
555 | int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]) |
556 | { | |
557 | struct l2cap_chan *chan = hdev->smp_data; | |
558 | struct smp_dev *smp; | |
559 | int err; | |
560 | ||
561 | if (!chan || !chan->data) | |
562 | return -EOPNOTSUPP; | |
563 | ||
564 | smp = chan->data; | |
565 | ||
566 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { | |
567 | BT_DBG("Using debug keys"); | |
568 | memcpy(smp->local_pk, debug_pk, 64); | |
569 | memcpy(smp->local_sk, debug_sk, 32); | |
570 | smp->debug_key = true; | |
571 | } else { | |
572 | while (true) { | |
71653eb6 MH |
573 | /* Seed private key with random number */ |
574 | get_random_bytes(smp->local_sk, 32); | |
575 | ||
60a27d65 | 576 | /* Generate local key pair for Secure Connections */ |
58771c1c | 577 | if (!generate_ecdh_keys(smp->local_pk, smp->local_sk)) |
60a27d65 MH |
578 | return -EIO; |
579 | ||
580 | /* This is unlikely, but we need to check that | |
581 | * we didn't accidentially generate a debug key. | |
582 | */ | |
329d8230 | 583 | if (crypto_memneq(smp->local_sk, debug_sk, 32)) |
60a27d65 MH |
584 | break; |
585 | } | |
586 | smp->debug_key = false; | |
587 | } | |
588 | ||
589 | SMP_DBG("OOB Public Key X: %32phN", smp->local_pk); | |
590 | SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32); | |
591 | SMP_DBG("OOB Private Key: %32phN", smp->local_sk); | |
592 | ||
fb334fee | 593 | get_random_bytes(smp->local_rand, 16); |
60a27d65 MH |
594 | |
595 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk, | |
fb334fee | 596 | smp->local_rand, 0, hash); |
60a27d65 MH |
597 | if (err < 0) |
598 | return err; | |
599 | ||
fb334fee | 600 | memcpy(rand, smp->local_rand, 16); |
60a27d65 MH |
601 | |
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; |
2fd36558 | 720 | req->max_key_size = SMP_DEV(hdev)->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; |
2fd36558 | 731 | rsp->max_key_size = SMP_DEV(hdev)->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 | |
2fd36558 JH |
745 | if (max_key_size > SMP_DEV(hdev)->max_key_size || |
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); |
6f48e260 | 774 | |
923e2414 JH |
775 | /* Ensure that we don't leave any debug key around if debug key |
776 | * support hasn't been explicitly enabled. | |
777 | */ | |
778 | if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG && | |
d7a5a11d | 779 | !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) { |
923e2414 JH |
780 | list_del_rcu(&smp->ltk->list); |
781 | kfree_rcu(smp->ltk, rcu); | |
782 | smp->ltk = NULL; | |
783 | } | |
784 | ||
6f48e260 JH |
785 | /* If pairing failed clean up any keys we might have */ |
786 | if (!complete) { | |
787 | if (smp->ltk) { | |
970d0f1b JH |
788 | list_del_rcu(&smp->ltk->list); |
789 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
790 | } |
791 | ||
792 | if (smp->slave_ltk) { | |
970d0f1b JH |
793 | list_del_rcu(&smp->slave_ltk->list); |
794 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
795 | } |
796 | ||
797 | if (smp->remote_irk) { | |
adae20cb JH |
798 | list_del_rcu(&smp->remote_irk->list); |
799 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
800 | } |
801 | } | |
802 | ||
803 | chan->data = NULL; | |
276812ec | 804 | kzfree(smp); |
923e2414 | 805 | hci_conn_drop(hcon); |
6f48e260 JH |
806 | } |
807 | ||
84794e11 | 808 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 809 | { |
bab73cb6 | 810 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 811 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 812 | |
84794e11 | 813 | if (reason) |
4f957a76 | 814 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 815 | &reason); |
4f957a76 | 816 | |
e1e930f5 | 817 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 818 | |
fc75cc86 | 819 | if (chan->data) |
f1c09c07 | 820 | smp_chan_destroy(conn); |
4f957a76 BG |
821 | } |
822 | ||
2b64d153 BG |
823 | #define JUST_WORKS 0x00 |
824 | #define JUST_CFM 0x01 | |
825 | #define REQ_PASSKEY 0x02 | |
826 | #define CFM_PASSKEY 0x03 | |
827 | #define REQ_OOB 0x04 | |
5e3d3d9b | 828 | #define DSP_PASSKEY 0x05 |
2b64d153 BG |
829 | #define OVERLAP 0xFF |
830 | ||
831 | static const u8 gen_method[5][5] = { | |
832 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
833 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
834 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
835 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
836 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
837 | }; | |
838 | ||
5e3d3d9b JH |
839 | static const u8 sc_method[5][5] = { |
840 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
841 | { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
842 | { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY }, | |
843 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
844 | { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
845 | }; | |
846 | ||
581370cc JH |
847 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
848 | { | |
2bcd4003 JH |
849 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
850 | * converted later to JUST_WORKS if we're initiators. | |
851 | */ | |
581370cc JH |
852 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
853 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 854 | return JUST_CFM; |
581370cc | 855 | |
5e3d3d9b JH |
856 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
857 | return sc_method[remote_io][local_io]; | |
858 | ||
581370cc JH |
859 | return gen_method[remote_io][local_io]; |
860 | } | |
861 | ||
2b64d153 BG |
862 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
863 | u8 local_io, u8 remote_io) | |
864 | { | |
865 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
866 | struct l2cap_chan *chan = conn->smp; |
867 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
868 | u32 passkey = 0; |
869 | int ret = 0; | |
870 | ||
871 | /* Initialize key for JUST WORKS */ | |
872 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 873 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
874 | |
875 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
876 | ||
2bcd4003 JH |
877 | /* If neither side wants MITM, either "just" confirm an incoming |
878 | * request or use just-works for outgoing ones. The JUST_CFM | |
879 | * will be converted to JUST_WORKS if necessary later in this | |
880 | * function. If either side has MITM look up the method from the | |
881 | * table. | |
882 | */ | |
581370cc | 883 | if (!(auth & SMP_AUTH_MITM)) |
783e0574 | 884 | smp->method = JUST_CFM; |
2b64d153 | 885 | else |
783e0574 | 886 | smp->method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 887 | |
a82505c7 | 888 | /* Don't confirm locally initiated pairing attempts */ |
783e0574 JH |
889 | if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, |
890 | &smp->flags)) | |
891 | smp->method = JUST_WORKS; | |
a82505c7 | 892 | |
02f3e254 | 893 | /* Don't bother user space with no IO capabilities */ |
783e0574 JH |
894 | if (smp->method == JUST_CFM && |
895 | hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
896 | smp->method = JUST_WORKS; | |
02f3e254 | 897 | |
2b64d153 | 898 | /* If Just Works, Continue with Zero TK */ |
783e0574 | 899 | if (smp->method == JUST_WORKS) { |
4a74d658 | 900 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
901 | return 0; |
902 | } | |
903 | ||
19c5ce9c JH |
904 | /* If this function is used for SC -> legacy fallback we |
905 | * can only recover the just-works case. | |
906 | */ | |
907 | if (test_bit(SMP_FLAG_SC, &smp->flags)) | |
908 | return -EINVAL; | |
909 | ||
2b64d153 | 910 | /* Not Just Works/Confirm results in MITM Authentication */ |
783e0574 | 911 | if (smp->method != JUST_CFM) { |
4a74d658 | 912 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
913 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
914 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
915 | } | |
2b64d153 BG |
916 | |
917 | /* If both devices have Keyoard-Display I/O, the master | |
918 | * Confirms and the slave Enters the passkey. | |
919 | */ | |
783e0574 | 920 | if (smp->method == OVERLAP) { |
40bef302 | 921 | if (hcon->role == HCI_ROLE_MASTER) |
783e0574 | 922 | smp->method = CFM_PASSKEY; |
2b64d153 | 923 | else |
783e0574 | 924 | smp->method = REQ_PASSKEY; |
2b64d153 BG |
925 | } |
926 | ||
01ad34d2 | 927 | /* Generate random passkey. */ |
783e0574 | 928 | if (smp->method == CFM_PASSKEY) { |
943a732a | 929 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
930 | get_random_bytes(&passkey, sizeof(passkey)); |
931 | passkey %= 1000000; | |
943a732a | 932 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 933 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 934 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
935 | } |
936 | ||
783e0574 | 937 | if (smp->method == REQ_PASSKEY) |
ce39fb4e | 938 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 939 | hcon->type, hcon->dst_type); |
783e0574 | 940 | else if (smp->method == JUST_CFM) |
4eb65e66 JH |
941 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
942 | hcon->type, hcon->dst_type, | |
943 | passkey, 1); | |
2b64d153 | 944 | else |
01ad34d2 | 945 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 946 | hcon->type, hcon->dst_type, |
39adbffe | 947 | passkey, 0); |
2b64d153 | 948 | |
2b64d153 BG |
949 | return ret; |
950 | } | |
951 | ||
1cc61144 | 952 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 953 | { |
8aab4757 | 954 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
955 | struct smp_cmd_pairing_confirm cp; |
956 | int ret; | |
8aab4757 VCG |
957 | |
958 | BT_DBG("conn %p", conn); | |
959 | ||
e491eaf3 | 960 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 961 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
962 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
963 | cp.confirm_val); | |
1cc61144 JH |
964 | if (ret) |
965 | return SMP_UNSPECIFIED; | |
8aab4757 | 966 | |
4a74d658 | 967 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 968 | |
8aab4757 VCG |
969 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
970 | ||
b28b4943 JH |
971 | if (conn->hcon->out) |
972 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
973 | else | |
974 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
975 | ||
1cc61144 | 976 | return 0; |
8aab4757 VCG |
977 | } |
978 | ||
861580a9 | 979 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 980 | { |
8aab4757 VCG |
981 | struct l2cap_conn *conn = smp->conn; |
982 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 983 | u8 confirm[16]; |
8aab4757 VCG |
984 | int ret; |
985 | ||
ec70f36f | 986 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 987 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
988 | |
989 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
990 | ||
e491eaf3 | 991 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 992 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 993 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
994 | if (ret) |
995 | return SMP_UNSPECIFIED; | |
8aab4757 | 996 | |
329d8230 | 997 | if (crypto_memneq(smp->pcnf, confirm, sizeof(smp->pcnf))) { |
8aab4757 | 998 | BT_ERR("Pairing failed (confirmation values mismatch)"); |
861580a9 | 999 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
1000 | } |
1001 | ||
1002 | if (hcon->out) { | |
fe39c7b2 MH |
1003 | u8 stk[16]; |
1004 | __le64 rand = 0; | |
1005 | __le16 ediv = 0; | |
8aab4757 | 1006 | |
e491eaf3 | 1007 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 1008 | |
861580a9 JH |
1009 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
1010 | return SMP_UNSPECIFIED; | |
8aab4757 | 1011 | |
8b76ce34 | 1012 | hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size); |
f7aa611a | 1013 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 1014 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 1015 | } else { |
fff3490f | 1016 | u8 stk[16], auth; |
fe39c7b2 MH |
1017 | __le64 rand = 0; |
1018 | __le16 ediv = 0; | |
8aab4757 | 1019 | |
943a732a JH |
1020 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1021 | smp->prnd); | |
8aab4757 | 1022 | |
e491eaf3 | 1023 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 1024 | |
fff3490f JH |
1025 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
1026 | auth = 1; | |
1027 | else | |
1028 | auth = 0; | |
1029 | ||
7d5843b7 JH |
1030 | /* Even though there's no _SLAVE suffix this is the |
1031 | * slave STK we're adding for later lookup (the master | |
1032 | * STK never needs to be stored). | |
1033 | */ | |
ce39fb4e | 1034 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1035 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
1036 | } |
1037 | ||
861580a9 | 1038 | return 0; |
8aab4757 VCG |
1039 | } |
1040 | ||
44f1a7ab JH |
1041 | static void smp_notify_keys(struct l2cap_conn *conn) |
1042 | { | |
1043 | struct l2cap_chan *chan = conn->smp; | |
1044 | struct smp_chan *smp = chan->data; | |
1045 | struct hci_conn *hcon = conn->hcon; | |
1046 | struct hci_dev *hdev = hcon->hdev; | |
1047 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
1048 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1049 | bool persistent; | |
1050 | ||
cad20c27 JH |
1051 | if (hcon->type == ACL_LINK) { |
1052 | if (hcon->key_type == HCI_LK_DEBUG_COMBINATION) | |
1053 | persistent = false; | |
1054 | else | |
1055 | persistent = !test_bit(HCI_CONN_FLUSH_KEY, | |
1056 | &hcon->flags); | |
1057 | } else { | |
1058 | /* The LTKs, IRKs and CSRKs should be persistent only if | |
1059 | * both sides had the bonding bit set in their | |
1060 | * authentication requests. | |
1061 | */ | |
1062 | persistent = !!((req->auth_req & rsp->auth_req) & | |
1063 | SMP_AUTH_BONDING); | |
1064 | } | |
1065 | ||
44f1a7ab | 1066 | if (smp->remote_irk) { |
cad20c27 JH |
1067 | mgmt_new_irk(hdev, smp->remote_irk, persistent); |
1068 | ||
44f1a7ab JH |
1069 | /* Now that user space can be considered to know the |
1070 | * identity address track the connection based on it | |
b5ae344d | 1071 | * from now on (assuming this is an LE link). |
44f1a7ab | 1072 | */ |
b5ae344d JH |
1073 | if (hcon->type == LE_LINK) { |
1074 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1075 | hcon->dst_type = smp->remote_irk->addr_type; | |
1076 | queue_work(hdev->workqueue, &conn->id_addr_update_work); | |
1077 | } | |
44f1a7ab JH |
1078 | } |
1079 | ||
44f1a7ab JH |
1080 | if (smp->csrk) { |
1081 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1082 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
1083 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
1084 | } | |
1085 | ||
1086 | if (smp->slave_csrk) { | |
1087 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1088 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
1089 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
1090 | } | |
1091 | ||
1092 | if (smp->ltk) { | |
1093 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1094 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
1095 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
1096 | } | |
1097 | ||
1098 | if (smp->slave_ltk) { | |
1099 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1100 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
1101 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
1102 | } | |
6a77083a JH |
1103 | |
1104 | if (smp->link_key) { | |
e3befab9 JH |
1105 | struct link_key *key; |
1106 | u8 type; | |
1107 | ||
1108 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1109 | type = HCI_LK_DEBUG_COMBINATION; | |
1110 | else if (hcon->sec_level == BT_SECURITY_FIPS) | |
1111 | type = HCI_LK_AUTH_COMBINATION_P256; | |
1112 | else | |
1113 | type = HCI_LK_UNAUTH_COMBINATION_P256; | |
1114 | ||
1115 | key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst, | |
1116 | smp->link_key, type, 0, &persistent); | |
1117 | if (key) { | |
1118 | mgmt_new_link_key(hdev, key, persistent); | |
1119 | ||
1120 | /* Don't keep debug keys around if the relevant | |
1121 | * flag is not set. | |
1122 | */ | |
d7a5a11d | 1123 | if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) && |
e3befab9 JH |
1124 | key->type == HCI_LK_DEBUG_COMBINATION) { |
1125 | list_del_rcu(&key->list); | |
1126 | kfree_rcu(key, rcu); | |
1127 | } | |
1128 | } | |
6a77083a JH |
1129 | } |
1130 | } | |
1131 | ||
d3e54a87 JH |
1132 | static void sc_add_ltk(struct smp_chan *smp) |
1133 | { | |
1134 | struct hci_conn *hcon = smp->conn->hcon; | |
1135 | u8 key_type, auth; | |
1136 | ||
1137 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1138 | key_type = SMP_LTK_P256_DEBUG; | |
1139 | else | |
1140 | key_type = SMP_LTK_P256; | |
1141 | ||
1142 | if (hcon->pending_sec_level == BT_SECURITY_FIPS) | |
1143 | auth = 1; | |
1144 | else | |
1145 | auth = 0; | |
1146 | ||
d3e54a87 JH |
1147 | smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
1148 | key_type, auth, smp->tk, smp->enc_key_size, | |
1149 | 0, 0); | |
1150 | } | |
1151 | ||
6a77083a JH |
1152 | static void sc_generate_link_key(struct smp_chan *smp) |
1153 | { | |
a62da6f1 | 1154 | /* From core spec. Spells out in ASCII as 'lebr'. */ |
6a77083a JH |
1155 | const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c }; |
1156 | ||
1157 | smp->link_key = kzalloc(16, GFP_KERNEL); | |
1158 | if (!smp->link_key) | |
1159 | return; | |
1160 | ||
a62da6f1 JH |
1161 | if (test_bit(SMP_FLAG_CT2, &smp->flags)) { |
1162 | /* SALT = 0x00000000000000000000000000000000746D7031 */ | |
1163 | const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1164 | ||
1165 | if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) { | |
1166 | kzfree(smp->link_key); | |
1167 | smp->link_key = NULL; | |
1168 | return; | |
1169 | } | |
1170 | } else { | |
1171 | /* From core spec. Spells out in ASCII as 'tmp1'. */ | |
1172 | const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1173 | ||
1174 | if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) { | |
1175 | kzfree(smp->link_key); | |
1176 | smp->link_key = NULL; | |
1177 | return; | |
1178 | } | |
6a77083a JH |
1179 | } |
1180 | ||
1181 | if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) { | |
276812ec | 1182 | kzfree(smp->link_key); |
6a77083a JH |
1183 | smp->link_key = NULL; |
1184 | return; | |
1185 | } | |
44f1a7ab JH |
1186 | } |
1187 | ||
b28b4943 JH |
1188 | static void smp_allow_key_dist(struct smp_chan *smp) |
1189 | { | |
1190 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
1191 | * will be allowed in each PDU handler to ensure we receive | |
1192 | * them in the correct order. | |
1193 | */ | |
1194 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
1195 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
1196 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
1197 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
1198 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
1199 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1200 | } | |
1201 | ||
b5ae344d JH |
1202 | static void sc_generate_ltk(struct smp_chan *smp) |
1203 | { | |
a62da6f1 | 1204 | /* From core spec. Spells out in ASCII as 'brle'. */ |
b5ae344d JH |
1205 | const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 }; |
1206 | struct hci_conn *hcon = smp->conn->hcon; | |
1207 | struct hci_dev *hdev = hcon->hdev; | |
1208 | struct link_key *key; | |
1209 | ||
1210 | key = hci_find_link_key(hdev, &hcon->dst); | |
1211 | if (!key) { | |
1212 | BT_ERR("%s No Link Key found to generate LTK", hdev->name); | |
1213 | return; | |
1214 | } | |
1215 | ||
1216 | if (key->type == HCI_LK_DEBUG_COMBINATION) | |
1217 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1218 | ||
a62da6f1 JH |
1219 | if (test_bit(SMP_FLAG_CT2, &smp->flags)) { |
1220 | /* SALT = 0x00000000000000000000000000000000746D7032 */ | |
1221 | const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1222 | ||
1223 | if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk)) | |
1224 | return; | |
1225 | } else { | |
1226 | /* From core spec. Spells out in ASCII as 'tmp2'. */ | |
1227 | const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1228 | ||
1229 | if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk)) | |
1230 | return; | |
1231 | } | |
b5ae344d JH |
1232 | |
1233 | if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk)) | |
1234 | return; | |
1235 | ||
1236 | sc_add_ltk(smp); | |
1237 | } | |
1238 | ||
d6268e86 | 1239 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
1240 | { |
1241 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 1242 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
1243 | struct hci_conn *hcon = conn->hcon; |
1244 | struct hci_dev *hdev = hcon->hdev; | |
1245 | __u8 *keydist; | |
1246 | ||
1247 | BT_DBG("conn %p", conn); | |
1248 | ||
44f1a7ab JH |
1249 | rsp = (void *) &smp->prsp[1]; |
1250 | ||
1251 | /* The responder sends its keys first */ | |
b28b4943 JH |
1252 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
1253 | smp_allow_key_dist(smp); | |
86d1407c | 1254 | return; |
b28b4943 | 1255 | } |
44f1a7ab JH |
1256 | |
1257 | req = (void *) &smp->preq[1]; | |
1258 | ||
1259 | if (hcon->out) { | |
1260 | keydist = &rsp->init_key_dist; | |
1261 | *keydist &= req->init_key_dist; | |
1262 | } else { | |
1263 | keydist = &rsp->resp_key_dist; | |
1264 | *keydist &= req->resp_key_dist; | |
1265 | } | |
1266 | ||
6a77083a | 1267 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
b5ae344d | 1268 | if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY)) |
6a77083a | 1269 | sc_generate_link_key(smp); |
b5ae344d JH |
1270 | if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY)) |
1271 | sc_generate_ltk(smp); | |
6a77083a JH |
1272 | |
1273 | /* Clear the keys which are generated but not distributed */ | |
1274 | *keydist &= ~SMP_SC_NO_DIST; | |
1275 | } | |
1276 | ||
44f1a7ab JH |
1277 | BT_DBG("keydist 0x%x", *keydist); |
1278 | ||
1279 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1280 | struct smp_cmd_encrypt_info enc; | |
1281 | struct smp_cmd_master_ident ident; | |
1282 | struct smp_ltk *ltk; | |
1283 | u8 authenticated; | |
1284 | __le16 ediv; | |
1285 | __le64 rand; | |
1286 | ||
1fc62c52 JH |
1287 | /* Make sure we generate only the significant amount of |
1288 | * bytes based on the encryption key size, and set the rest | |
1289 | * of the value to zeroes. | |
1290 | */ | |
1291 | get_random_bytes(enc.ltk, smp->enc_key_size); | |
1292 | memset(enc.ltk + smp->enc_key_size, 0, | |
1293 | sizeof(enc.ltk) - smp->enc_key_size); | |
1294 | ||
44f1a7ab JH |
1295 | get_random_bytes(&ediv, sizeof(ediv)); |
1296 | get_random_bytes(&rand, sizeof(rand)); | |
1297 | ||
1298 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1299 | ||
1300 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
1301 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
1302 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
1303 | smp->enc_key_size, ediv, rand); | |
1304 | smp->slave_ltk = ltk; | |
1305 | ||
1306 | ident.ediv = ediv; | |
1307 | ident.rand = rand; | |
1308 | ||
1309 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1310 | ||
1311 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1312 | } | |
1313 | ||
1314 | if (*keydist & SMP_DIST_ID_KEY) { | |
1315 | struct smp_cmd_ident_addr_info addrinfo; | |
1316 | struct smp_cmd_ident_info idinfo; | |
1317 | ||
1318 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
1319 | ||
1320 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1321 | ||
1322 | /* The hci_conn contains the local identity address | |
1323 | * after the connection has been established. | |
1324 | * | |
1325 | * This is true even when the connection has been | |
1326 | * established using a resolvable random address. | |
1327 | */ | |
1328 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
1329 | addrinfo.addr_type = hcon->src_type; | |
1330 | ||
1331 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1332 | &addrinfo); | |
1333 | ||
1334 | *keydist &= ~SMP_DIST_ID_KEY; | |
1335 | } | |
1336 | ||
1337 | if (*keydist & SMP_DIST_SIGN) { | |
1338 | struct smp_cmd_sign_info sign; | |
1339 | struct smp_csrk *csrk; | |
1340 | ||
1341 | /* Generate a new random key */ | |
1342 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1343 | ||
1344 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1345 | if (csrk) { | |
4cd3928a JH |
1346 | if (hcon->sec_level > BT_SECURITY_MEDIUM) |
1347 | csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED; | |
1348 | else | |
1349 | csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED; | |
44f1a7ab JH |
1350 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); |
1351 | } | |
1352 | smp->slave_csrk = csrk; | |
1353 | ||
1354 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1355 | ||
1356 | *keydist &= ~SMP_DIST_SIGN; | |
1357 | } | |
1358 | ||
1359 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
1360 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
1361 | smp_allow_key_dist(smp); | |
86d1407c | 1362 | return; |
b28b4943 | 1363 | } |
44f1a7ab | 1364 | |
44f1a7ab JH |
1365 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1366 | smp_notify_keys(conn); | |
1367 | ||
1368 | smp_chan_destroy(conn); | |
44f1a7ab JH |
1369 | } |
1370 | ||
b68fda68 JH |
1371 | static void smp_timeout(struct work_struct *work) |
1372 | { | |
1373 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
1374 | security_timer.work); | |
1375 | struct l2cap_conn *conn = smp->conn; | |
1376 | ||
1377 | BT_DBG("conn %p", conn); | |
1378 | ||
1e91c29e | 1379 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
1380 | } |
1381 | ||
8aab4757 VCG |
1382 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
1383 | { | |
5d88cc73 | 1384 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
1385 | struct smp_chan *smp; |
1386 | ||
f1560463 | 1387 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 1388 | if (!smp) |
8aab4757 VCG |
1389 | return NULL; |
1390 | ||
a4770e11 | 1391 | smp->tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
6a7bd103 | 1392 | if (IS_ERR(smp->tfm_aes)) { |
a4770e11 | 1393 | BT_ERR("Unable to create AES crypto context"); |
276812ec | 1394 | kzfree(smp); |
6a7bd103 JH |
1395 | return NULL; |
1396 | } | |
1397 | ||
71af2f6b | 1398 | smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
407cecf6 JH |
1399 | if (IS_ERR(smp->tfm_cmac)) { |
1400 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 1401 | crypto_free_cipher(smp->tfm_aes); |
276812ec | 1402 | kzfree(smp); |
407cecf6 JH |
1403 | return NULL; |
1404 | } | |
1405 | ||
8aab4757 | 1406 | smp->conn = conn; |
5d88cc73 | 1407 | chan->data = smp; |
8aab4757 | 1408 | |
b28b4943 JH |
1409 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
1410 | ||
b68fda68 JH |
1411 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
1412 | ||
8aab4757 VCG |
1413 | hci_conn_hold(conn->hcon); |
1414 | ||
1415 | return smp; | |
1416 | } | |
1417 | ||
760b018b JH |
1418 | static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16]) |
1419 | { | |
1420 | struct hci_conn *hcon = smp->conn->hcon; | |
1421 | u8 *na, *nb, a[7], b[7]; | |
1422 | ||
1423 | if (hcon->out) { | |
1424 | na = smp->prnd; | |
1425 | nb = smp->rrnd; | |
1426 | } else { | |
1427 | na = smp->rrnd; | |
1428 | nb = smp->prnd; | |
1429 | } | |
1430 | ||
1431 | memcpy(a, &hcon->init_addr, 6); | |
1432 | memcpy(b, &hcon->resp_addr, 6); | |
1433 | a[6] = hcon->init_addr_type; | |
1434 | b[6] = hcon->resp_addr_type; | |
1435 | ||
1436 | return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk); | |
1437 | } | |
1438 | ||
38606f14 | 1439 | static void sc_dhkey_check(struct smp_chan *smp) |
760b018b JH |
1440 | { |
1441 | struct hci_conn *hcon = smp->conn->hcon; | |
1442 | struct smp_cmd_dhkey_check check; | |
1443 | u8 a[7], b[7], *local_addr, *remote_addr; | |
1444 | u8 io_cap[3], r[16]; | |
1445 | ||
760b018b JH |
1446 | memcpy(a, &hcon->init_addr, 6); |
1447 | memcpy(b, &hcon->resp_addr, 6); | |
1448 | a[6] = hcon->init_addr_type; | |
1449 | b[6] = hcon->resp_addr_type; | |
1450 | ||
1451 | if (hcon->out) { | |
1452 | local_addr = a; | |
1453 | remote_addr = b; | |
1454 | memcpy(io_cap, &smp->preq[1], 3); | |
1455 | } else { | |
1456 | local_addr = b; | |
1457 | remote_addr = a; | |
1458 | memcpy(io_cap, &smp->prsp[1], 3); | |
1459 | } | |
1460 | ||
dddd3059 JH |
1461 | memset(r, 0, sizeof(r)); |
1462 | ||
1463 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
38606f14 | 1464 | put_unaligned_le32(hcon->passkey_notify, r); |
760b018b | 1465 | |
a29b0733 JH |
1466 | if (smp->method == REQ_OOB) |
1467 | memcpy(r, smp->rr, 16); | |
1468 | ||
760b018b JH |
1469 | smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap, |
1470 | local_addr, remote_addr, check.e); | |
1471 | ||
1472 | smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check); | |
dddd3059 JH |
1473 | } |
1474 | ||
38606f14 JH |
1475 | static u8 sc_passkey_send_confirm(struct smp_chan *smp) |
1476 | { | |
1477 | struct l2cap_conn *conn = smp->conn; | |
1478 | struct hci_conn *hcon = conn->hcon; | |
1479 | struct smp_cmd_pairing_confirm cfm; | |
1480 | u8 r; | |
1481 | ||
1482 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1483 | r |= 0x80; | |
1484 | ||
1485 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); | |
1486 | ||
1487 | if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r, | |
1488 | cfm.confirm_val)) | |
1489 | return SMP_UNSPECIFIED; | |
1490 | ||
1491 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op) | |
1497 | { | |
1498 | struct l2cap_conn *conn = smp->conn; | |
1499 | struct hci_conn *hcon = conn->hcon; | |
1500 | struct hci_dev *hdev = hcon->hdev; | |
1501 | u8 cfm[16], r; | |
1502 | ||
1503 | /* Ignore the PDU if we've already done 20 rounds (0 - 19) */ | |
1504 | if (smp->passkey_round >= 20) | |
1505 | return 0; | |
1506 | ||
1507 | switch (smp_op) { | |
1508 | case SMP_CMD_PAIRING_RANDOM: | |
1509 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1510 | r |= 0x80; | |
1511 | ||
1512 | if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1513 | smp->rrnd, r, cfm)) | |
1514 | return SMP_UNSPECIFIED; | |
1515 | ||
329d8230 | 1516 | if (crypto_memneq(smp->pcnf, cfm, 16)) |
38606f14 JH |
1517 | return SMP_CONFIRM_FAILED; |
1518 | ||
1519 | smp->passkey_round++; | |
1520 | ||
1521 | if (smp->passkey_round == 20) { | |
1522 | /* Generate MacKey and LTK */ | |
1523 | if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk)) | |
1524 | return SMP_UNSPECIFIED; | |
1525 | } | |
1526 | ||
1527 | /* The round is only complete when the initiator | |
1528 | * receives pairing random. | |
1529 | */ | |
1530 | if (!hcon->out) { | |
1531 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1532 | sizeof(smp->prnd), smp->prnd); | |
d3e54a87 | 1533 | if (smp->passkey_round == 20) |
38606f14 | 1534 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
d3e54a87 | 1535 | else |
38606f14 | 1536 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
38606f14 JH |
1537 | return 0; |
1538 | } | |
1539 | ||
1540 | /* Start the next round */ | |
1541 | if (smp->passkey_round != 20) | |
1542 | return sc_passkey_round(smp, 0); | |
1543 | ||
1544 | /* Passkey rounds are complete - start DHKey Check */ | |
1545 | sc_dhkey_check(smp); | |
1546 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1547 | ||
1548 | break; | |
1549 | ||
1550 | case SMP_CMD_PAIRING_CONFIRM: | |
1551 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
1552 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
1553 | return 0; | |
1554 | } | |
1555 | ||
1556 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1557 | ||
1558 | if (hcon->out) { | |
1559 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1560 | sizeof(smp->prnd), smp->prnd); | |
1561 | return 0; | |
1562 | } | |
1563 | ||
1564 | return sc_passkey_send_confirm(smp); | |
1565 | ||
1566 | case SMP_CMD_PUBLIC_KEY: | |
1567 | default: | |
1568 | /* Initiating device starts the round */ | |
1569 | if (!hcon->out) | |
1570 | return 0; | |
1571 | ||
1572 | BT_DBG("%s Starting passkey round %u", hdev->name, | |
1573 | smp->passkey_round + 1); | |
1574 | ||
1575 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1576 | ||
1577 | return sc_passkey_send_confirm(smp); | |
1578 | } | |
1579 | ||
1580 | return 0; | |
1581 | } | |
1582 | ||
dddd3059 JH |
1583 | static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey) |
1584 | { | |
38606f14 JH |
1585 | struct l2cap_conn *conn = smp->conn; |
1586 | struct hci_conn *hcon = conn->hcon; | |
1587 | u8 smp_op; | |
1588 | ||
1589 | clear_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
1590 | ||
dddd3059 JH |
1591 | switch (mgmt_op) { |
1592 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1593 | smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED); | |
1594 | return 0; | |
1595 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
1596 | smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED); | |
1597 | return 0; | |
38606f14 JH |
1598 | case MGMT_OP_USER_PASSKEY_REPLY: |
1599 | hcon->passkey_notify = le32_to_cpu(passkey); | |
1600 | smp->passkey_round = 0; | |
1601 | ||
1602 | if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) | |
1603 | smp_op = SMP_CMD_PAIRING_CONFIRM; | |
1604 | else | |
1605 | smp_op = 0; | |
1606 | ||
1607 | if (sc_passkey_round(smp, smp_op)) | |
1608 | return -EIO; | |
1609 | ||
1610 | return 0; | |
dddd3059 JH |
1611 | } |
1612 | ||
d3e54a87 JH |
1613 | /* Initiator sends DHKey check first */ |
1614 | if (hcon->out) { | |
1615 | sc_dhkey_check(smp); | |
1616 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1617 | } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) { | |
1618 | sc_dhkey_check(smp); | |
1619 | sc_add_ltk(smp); | |
1620 | } | |
760b018b JH |
1621 | |
1622 | return 0; | |
1623 | } | |
1624 | ||
2b64d153 BG |
1625 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
1626 | { | |
b10e8017 | 1627 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 1628 | struct l2cap_chan *chan; |
2b64d153 BG |
1629 | struct smp_chan *smp; |
1630 | u32 value; | |
fc75cc86 | 1631 | int err; |
2b64d153 BG |
1632 | |
1633 | BT_DBG(""); | |
1634 | ||
fc75cc86 | 1635 | if (!conn) |
2b64d153 BG |
1636 | return -ENOTCONN; |
1637 | ||
5d88cc73 JH |
1638 | chan = conn->smp; |
1639 | if (!chan) | |
1640 | return -ENOTCONN; | |
1641 | ||
fc75cc86 JH |
1642 | l2cap_chan_lock(chan); |
1643 | if (!chan->data) { | |
1644 | err = -ENOTCONN; | |
1645 | goto unlock; | |
1646 | } | |
1647 | ||
5d88cc73 | 1648 | smp = chan->data; |
2b64d153 | 1649 | |
760b018b JH |
1650 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1651 | err = sc_user_reply(smp, mgmt_op, passkey); | |
1652 | goto unlock; | |
1653 | } | |
1654 | ||
2b64d153 BG |
1655 | switch (mgmt_op) { |
1656 | case MGMT_OP_USER_PASSKEY_REPLY: | |
1657 | value = le32_to_cpu(passkey); | |
943a732a | 1658 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 1659 | BT_DBG("PassKey: %d", value); |
943a732a | 1660 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
1661 | /* Fall Through */ |
1662 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 1663 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
1664 | break; |
1665 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1666 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 1667 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1668 | err = 0; |
1669 | goto unlock; | |
2b64d153 | 1670 | default: |
84794e11 | 1671 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1672 | err = -EOPNOTSUPP; |
1673 | goto unlock; | |
2b64d153 BG |
1674 | } |
1675 | ||
fc75cc86 JH |
1676 | err = 0; |
1677 | ||
2b64d153 | 1678 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
1679 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
1680 | u8 rsp = smp_confirm(smp); | |
1681 | if (rsp) | |
1682 | smp_failure(conn, rsp); | |
1683 | } | |
2b64d153 | 1684 | |
fc75cc86 JH |
1685 | unlock: |
1686 | l2cap_chan_unlock(chan); | |
1687 | return err; | |
2b64d153 BG |
1688 | } |
1689 | ||
b5ae344d JH |
1690 | static void build_bredr_pairing_cmd(struct smp_chan *smp, |
1691 | struct smp_cmd_pairing *req, | |
1692 | struct smp_cmd_pairing *rsp) | |
1693 | { | |
1694 | struct l2cap_conn *conn = smp->conn; | |
1695 | struct hci_dev *hdev = conn->hcon->hdev; | |
1696 | u8 local_dist = 0, remote_dist = 0; | |
1697 | ||
d7a5a11d | 1698 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
b5ae344d JH |
1699 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
1700 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1701 | } | |
1702 | ||
d7a5a11d | 1703 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
b5ae344d JH |
1704 | remote_dist |= SMP_DIST_ID_KEY; |
1705 | ||
d7a5a11d | 1706 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
b5ae344d JH |
1707 | local_dist |= SMP_DIST_ID_KEY; |
1708 | ||
1709 | if (!rsp) { | |
1710 | memset(req, 0, sizeof(*req)); | |
1711 | ||
a62da6f1 | 1712 | req->auth_req = SMP_AUTH_CT2; |
b5ae344d JH |
1713 | req->init_key_dist = local_dist; |
1714 | req->resp_key_dist = remote_dist; | |
e3f6a257 | 1715 | req->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1716 | |
1717 | smp->remote_key_dist = remote_dist; | |
1718 | ||
1719 | return; | |
1720 | } | |
1721 | ||
1722 | memset(rsp, 0, sizeof(*rsp)); | |
1723 | ||
a62da6f1 | 1724 | rsp->auth_req = SMP_AUTH_CT2; |
e3f6a257 | 1725 | rsp->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1726 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
1727 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
1728 | ||
1729 | smp->remote_key_dist = rsp->init_key_dist; | |
1730 | } | |
1731 | ||
da85e5e5 | 1732 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1733 | { |
3158c50c | 1734 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 1735 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 1736 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 1737 | struct smp_chan *smp; |
c7262e71 | 1738 | u8 key_size, auth, sec_level; |
8aab4757 | 1739 | int ret; |
88ba43b6 AB |
1740 | |
1741 | BT_DBG("conn %p", conn); | |
1742 | ||
c46b98be | 1743 | if (skb->len < sizeof(*req)) |
38e4a915 | 1744 | return SMP_INVALID_PARAMS; |
c46b98be | 1745 | |
40bef302 | 1746 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
1747 | return SMP_CMD_NOTSUPP; |
1748 | ||
fc75cc86 | 1749 | if (!chan->data) |
8aab4757 | 1750 | smp = smp_chan_create(conn); |
fc75cc86 | 1751 | else |
5d88cc73 | 1752 | smp = chan->data; |
8aab4757 | 1753 | |
d08fd0e7 AE |
1754 | if (!smp) |
1755 | return SMP_UNSPECIFIED; | |
d26a2345 | 1756 | |
c05b9339 | 1757 | /* We didn't start the pairing, so match remote */ |
0edb14de | 1758 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1759 | |
d7a5a11d | 1760 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 1761 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
1762 | return SMP_PAIRING_NOTSUPP; |
1763 | ||
d7a5a11d | 1764 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1765 | return SMP_AUTH_REQUIREMENTS; |
1766 | ||
1c1def09 VCG |
1767 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1768 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 1769 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 1770 | |
cb06d366 JH |
1771 | /* If the remote side's OOB flag is set it means it has |
1772 | * successfully received our local OOB data - therefore set the | |
1773 | * flag to indicate that local OOB is in use. | |
1774 | */ | |
58428563 JH |
1775 | if (req->oob_flag == SMP_OOB_PRESENT) |
1776 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1777 | ||
b5ae344d JH |
1778 | /* SMP over BR/EDR requires special treatment */ |
1779 | if (conn->hcon->type == ACL_LINK) { | |
1780 | /* We must have a BR/EDR SC link */ | |
08f63cc5 | 1781 | if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) && |
b7cb93e5 | 1782 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
1783 | return SMP_CROSS_TRANSP_NOT_ALLOWED; |
1784 | ||
1785 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1786 | ||
1787 | build_bredr_pairing_cmd(smp, req, &rsp); | |
1788 | ||
a62da6f1 JH |
1789 | if (req->auth_req & SMP_AUTH_CT2) |
1790 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1791 | ||
b5ae344d JH |
1792 | key_size = min(req->max_key_size, rsp.max_key_size); |
1793 | if (check_enc_key_size(conn, key_size)) | |
1794 | return SMP_ENC_KEY_SIZE; | |
1795 | ||
1796 | /* Clear bits which are generated but not distributed */ | |
1797 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1798 | ||
1799 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; | |
1800 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
1801 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); | |
1802 | ||
1803 | smp_distribute_keys(smp); | |
1804 | return 0; | |
1805 | } | |
1806 | ||
5e3d3d9b JH |
1807 | build_pairing_cmd(conn, req, &rsp, auth); |
1808 | ||
a62da6f1 | 1809 | if (rsp.auth_req & SMP_AUTH_SC) { |
5e3d3d9b JH |
1810 | set_bit(SMP_FLAG_SC, &smp->flags); |
1811 | ||
a62da6f1 JH |
1812 | if (rsp.auth_req & SMP_AUTH_CT2) |
1813 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1814 | } | |
1815 | ||
5be5e275 | 1816 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1817 | sec_level = BT_SECURITY_MEDIUM; |
1818 | else | |
1819 | sec_level = authreq_to_seclevel(auth); | |
1820 | ||
c7262e71 JH |
1821 | if (sec_level > conn->hcon->pending_sec_level) |
1822 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1823 | |
49c922bb | 1824 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1825 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1826 | u8 method; | |
1827 | ||
1828 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1829 | req->io_capability); | |
1830 | if (method == JUST_WORKS || method == JUST_CFM) | |
1831 | return SMP_AUTH_REQUIREMENTS; | |
1832 | } | |
1833 | ||
3158c50c VCG |
1834 | key_size = min(req->max_key_size, rsp.max_key_size); |
1835 | if (check_enc_key_size(conn, key_size)) | |
1836 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1837 | |
e84a6b13 | 1838 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1839 | |
1c1def09 VCG |
1840 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1841 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1842 | |
3158c50c | 1843 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1844 | |
1845 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1846 | ||
19c5ce9c JH |
1847 | /* Strictly speaking we shouldn't allow Pairing Confirm for the |
1848 | * SC case, however some implementations incorrectly copy RFU auth | |
1849 | * req bits from our security request, which may create a false | |
1850 | * positive SC enablement. | |
1851 | */ | |
1852 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1853 | ||
3b19146d JH |
1854 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1855 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1856 | /* Clear bits which are generated but not distributed */ | |
1857 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1858 | /* Wait for Public Key from Initiating Device */ | |
1859 | return 0; | |
3b19146d | 1860 | } |
da85e5e5 | 1861 | |
2b64d153 BG |
1862 | /* Request setup of TK */ |
1863 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1864 | if (ret) | |
1865 | return SMP_UNSPECIFIED; | |
1866 | ||
da85e5e5 | 1867 | return 0; |
88ba43b6 AB |
1868 | } |
1869 | ||
3b19146d JH |
1870 | static u8 sc_send_public_key(struct smp_chan *smp) |
1871 | { | |
70157ef5 JH |
1872 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
1873 | ||
3b19146d JH |
1874 | BT_DBG(""); |
1875 | ||
1a8bab4f | 1876 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { |
33d0c030 MH |
1877 | struct l2cap_chan *chan = hdev->smp_data; |
1878 | struct smp_dev *smp_dev; | |
1879 | ||
1880 | if (!chan || !chan->data) | |
1881 | return SMP_UNSPECIFIED; | |
1882 | ||
1883 | smp_dev = chan->data; | |
1884 | ||
1885 | memcpy(smp->local_pk, smp_dev->local_pk, 64); | |
1886 | memcpy(smp->local_sk, smp_dev->local_sk, 32); | |
fb334fee | 1887 | memcpy(smp->lr, smp_dev->local_rand, 16); |
33d0c030 MH |
1888 | |
1889 | if (smp_dev->debug_key) | |
1890 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1891 | ||
1892 | goto done; | |
1893 | } | |
1894 | ||
d7a5a11d | 1895 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { |
70157ef5 JH |
1896 | BT_DBG("Using debug keys"); |
1897 | memcpy(smp->local_pk, debug_pk, 64); | |
1898 | memcpy(smp->local_sk, debug_sk, 32); | |
1899 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1900 | } else { | |
1901 | while (true) { | |
71653eb6 MH |
1902 | /* Seed private key with random number */ |
1903 | get_random_bytes(smp->local_sk, 32); | |
1904 | ||
70157ef5 | 1905 | /* Generate local key pair for Secure Connections */ |
58771c1c | 1906 | if (!generate_ecdh_keys(smp->local_pk, smp->local_sk)) |
70157ef5 | 1907 | return SMP_UNSPECIFIED; |
6c0dcc50 | 1908 | |
70157ef5 JH |
1909 | /* This is unlikely, but we need to check that |
1910 | * we didn't accidentially generate a debug key. | |
1911 | */ | |
329d8230 | 1912 | if (crypto_memneq(smp->local_sk, debug_sk, 32)) |
70157ef5 JH |
1913 | break; |
1914 | } | |
6c0dcc50 | 1915 | } |
3b19146d | 1916 | |
33d0c030 | 1917 | done: |
c7a3d57d | 1918 | SMP_DBG("Local Public Key X: %32phN", smp->local_pk); |
8e4e2ee5 | 1919 | SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32); |
c7a3d57d | 1920 | SMP_DBG("Local Private Key: %32phN", smp->local_sk); |
3b19146d JH |
1921 | |
1922 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1923 | ||
1924 | return 0; | |
1925 | } | |
1926 | ||
da85e5e5 | 1927 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1928 | { |
3158c50c | 1929 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1930 | struct l2cap_chan *chan = conn->smp; |
1931 | struct smp_chan *smp = chan->data; | |
0edb14de | 1932 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1933 | u8 key_size, auth; |
7d24ddcc | 1934 | int ret; |
88ba43b6 AB |
1935 | |
1936 | BT_DBG("conn %p", conn); | |
1937 | ||
c46b98be | 1938 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1939 | return SMP_INVALID_PARAMS; |
c46b98be | 1940 | |
40bef302 | 1941 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1942 | return SMP_CMD_NOTSUPP; |
1943 | ||
3158c50c VCG |
1944 | skb_pull(skb, sizeof(*rsp)); |
1945 | ||
1c1def09 | 1946 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1947 | |
3158c50c VCG |
1948 | key_size = min(req->max_key_size, rsp->max_key_size); |
1949 | if (check_enc_key_size(conn, key_size)) | |
1950 | return SMP_ENC_KEY_SIZE; | |
1951 | ||
0edb14de | 1952 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1953 | |
d7a5a11d | 1954 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1955 | return SMP_AUTH_REQUIREMENTS; |
1956 | ||
cb06d366 JH |
1957 | /* If the remote side's OOB flag is set it means it has |
1958 | * successfully received our local OOB data - therefore set the | |
1959 | * flag to indicate that local OOB is in use. | |
1960 | */ | |
58428563 JH |
1961 | if (rsp->oob_flag == SMP_OOB_PRESENT) |
1962 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1963 | ||
b5ae344d JH |
1964 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1965 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
1966 | ||
1967 | /* Update remote key distribution in case the remote cleared | |
1968 | * some bits that we had enabled in our request. | |
1969 | */ | |
1970 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1971 | ||
a62da6f1 JH |
1972 | if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2)) |
1973 | set_bit(SMP_FLAG_CT2, &smp->flags); | |
1974 | ||
b5ae344d JH |
1975 | /* For BR/EDR this means we're done and can start phase 3 */ |
1976 | if (conn->hcon->type == ACL_LINK) { | |
1977 | /* Clear bits which are generated but not distributed */ | |
1978 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1979 | smp_distribute_keys(smp); | |
1980 | return 0; | |
1981 | } | |
1982 | ||
65668776 JH |
1983 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1984 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1985 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1986 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1987 | |
49c922bb | 1988 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1989 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1990 | u8 method; | |
1991 | ||
1992 | method = get_auth_method(smp, req->io_capability, | |
1993 | rsp->io_capability); | |
1994 | if (method == JUST_WORKS || method == JUST_CFM) | |
1995 | return SMP_AUTH_REQUIREMENTS; | |
1996 | } | |
1997 | ||
e84a6b13 | 1998 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1999 | |
fdcc4bec JH |
2000 | /* Update remote key distribution in case the remote cleared |
2001 | * some bits that we had enabled in our request. | |
2002 | */ | |
2003 | smp->remote_key_dist &= rsp->resp_key_dist; | |
2004 | ||
3b19146d JH |
2005 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2006 | /* Clear bits which are generated but not distributed */ | |
2007 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
2008 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
2009 | return sc_send_public_key(smp); | |
2010 | } | |
2011 | ||
c05b9339 | 2012 | auth |= req->auth_req; |
2b64d153 | 2013 | |
476585ec | 2014 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
2015 | if (ret) |
2016 | return SMP_UNSPECIFIED; | |
2017 | ||
4a74d658 | 2018 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
2019 | |
2020 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 2021 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 2022 | return smp_confirm(smp); |
da85e5e5 VCG |
2023 | |
2024 | return 0; | |
88ba43b6 AB |
2025 | } |
2026 | ||
dcee2b32 JH |
2027 | static u8 sc_check_confirm(struct smp_chan *smp) |
2028 | { | |
2029 | struct l2cap_conn *conn = smp->conn; | |
2030 | ||
2031 | BT_DBG(""); | |
2032 | ||
38606f14 JH |
2033 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2034 | return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM); | |
2035 | ||
dcee2b32 JH |
2036 | if (conn->hcon->out) { |
2037 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2038 | smp->prnd); | |
2039 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2040 | } | |
2041 | ||
2042 | return 0; | |
2043 | } | |
2044 | ||
19c5ce9c JH |
2045 | /* Work-around for some implementations that incorrectly copy RFU bits |
2046 | * from our security request and thereby create the impression that | |
2047 | * we're doing SC when in fact the remote doesn't support it. | |
2048 | */ | |
2049 | static int fixup_sc_false_positive(struct smp_chan *smp) | |
2050 | { | |
2051 | struct l2cap_conn *conn = smp->conn; | |
2052 | struct hci_conn *hcon = conn->hcon; | |
2053 | struct hci_dev *hdev = hcon->hdev; | |
2054 | struct smp_cmd_pairing *req, *rsp; | |
2055 | u8 auth; | |
2056 | ||
2057 | /* The issue is only observed when we're in slave role */ | |
2058 | if (hcon->out) | |
2059 | return SMP_UNSPECIFIED; | |
2060 | ||
2061 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) { | |
2062 | BT_ERR("Refusing SMP SC -> legacy fallback in SC-only mode"); | |
2063 | return SMP_UNSPECIFIED; | |
2064 | } | |
2065 | ||
2066 | BT_ERR("Trying to fall back to legacy SMP"); | |
2067 | ||
2068 | req = (void *) &smp->preq[1]; | |
2069 | rsp = (void *) &smp->prsp[1]; | |
2070 | ||
2071 | /* Rebuild key dist flags which may have been cleared for SC */ | |
2072 | smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist); | |
2073 | ||
2074 | auth = req->auth_req & AUTH_REQ_MASK(hdev); | |
2075 | ||
2076 | if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) { | |
2077 | BT_ERR("Failed to fall back to legacy SMP"); | |
2078 | return SMP_UNSPECIFIED; | |
2079 | } | |
2080 | ||
2081 | clear_bit(SMP_FLAG_SC, &smp->flags); | |
2082 | ||
2083 | return 0; | |
2084 | } | |
2085 | ||
da85e5e5 | 2086 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2087 | { |
5d88cc73 JH |
2088 | struct l2cap_chan *chan = conn->smp; |
2089 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 2090 | |
88ba43b6 AB |
2091 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
2092 | ||
c46b98be | 2093 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 2094 | return SMP_INVALID_PARAMS; |
c46b98be | 2095 | |
1c1def09 VCG |
2096 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
2097 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 2098 | |
19c5ce9c JH |
2099 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2100 | int ret; | |
2101 | ||
2102 | /* Public Key exchange must happen before any other steps */ | |
2103 | if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags)) | |
2104 | return sc_check_confirm(smp); | |
2105 | ||
2106 | BT_ERR("Unexpected SMP Pairing Confirm"); | |
2107 | ||
2108 | ret = fixup_sc_false_positive(smp); | |
2109 | if (ret) | |
2110 | return ret; | |
2111 | } | |
dcee2b32 | 2112 | |
b28b4943 | 2113 | if (conn->hcon->out) { |
943a732a JH |
2114 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
2115 | smp->prnd); | |
b28b4943 JH |
2116 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
2117 | return 0; | |
2118 | } | |
2119 | ||
2120 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 2121 | return smp_confirm(smp); |
983f9814 MH |
2122 | |
2123 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
da85e5e5 VCG |
2124 | |
2125 | return 0; | |
88ba43b6 AB |
2126 | } |
2127 | ||
da85e5e5 | 2128 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2129 | { |
5d88cc73 JH |
2130 | struct l2cap_chan *chan = conn->smp; |
2131 | struct smp_chan *smp = chan->data; | |
191dc7fe JH |
2132 | struct hci_conn *hcon = conn->hcon; |
2133 | u8 *pkax, *pkbx, *na, *nb; | |
2134 | u32 passkey; | |
2135 | int err; | |
7d24ddcc | 2136 | |
8aab4757 | 2137 | BT_DBG("conn %p", conn); |
3158c50c | 2138 | |
c46b98be | 2139 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 2140 | return SMP_INVALID_PARAMS; |
c46b98be | 2141 | |
943a732a | 2142 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 2143 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 2144 | |
191dc7fe JH |
2145 | if (!test_bit(SMP_FLAG_SC, &smp->flags)) |
2146 | return smp_random(smp); | |
2147 | ||
580039e8 JH |
2148 | if (hcon->out) { |
2149 | pkax = smp->local_pk; | |
2150 | pkbx = smp->remote_pk; | |
2151 | na = smp->prnd; | |
2152 | nb = smp->rrnd; | |
2153 | } else { | |
2154 | pkax = smp->remote_pk; | |
2155 | pkbx = smp->local_pk; | |
2156 | na = smp->rrnd; | |
2157 | nb = smp->prnd; | |
2158 | } | |
2159 | ||
a29b0733 JH |
2160 | if (smp->method == REQ_OOB) { |
2161 | if (!hcon->out) | |
2162 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2163 | sizeof(smp->prnd), smp->prnd); | |
2164 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
2165 | goto mackey_and_ltk; | |
2166 | } | |
2167 | ||
38606f14 JH |
2168 | /* Passkey entry has special treatment */ |
2169 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
2170 | return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM); | |
2171 | ||
191dc7fe JH |
2172 | if (hcon->out) { |
2173 | u8 cfm[16]; | |
2174 | ||
2175 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
2176 | smp->rrnd, 0, cfm); | |
2177 | if (err) | |
2178 | return SMP_UNSPECIFIED; | |
2179 | ||
329d8230 | 2180 | if (crypto_memneq(smp->pcnf, cfm, 16)) |
191dc7fe | 2181 | return SMP_CONFIRM_FAILED; |
191dc7fe JH |
2182 | } else { |
2183 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2184 | smp->prnd); | |
2185 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
191dc7fe JH |
2186 | } |
2187 | ||
a29b0733 | 2188 | mackey_and_ltk: |
760b018b JH |
2189 | /* Generate MacKey and LTK */ |
2190 | err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk); | |
2191 | if (err) | |
2192 | return SMP_UNSPECIFIED; | |
2193 | ||
a29b0733 | 2194 | if (smp->method == JUST_WORKS || smp->method == REQ_OOB) { |
dddd3059 | 2195 | if (hcon->out) { |
38606f14 | 2196 | sc_dhkey_check(smp); |
dddd3059 JH |
2197 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
2198 | } | |
2199 | return 0; | |
2200 | } | |
2201 | ||
38606f14 JH |
2202 | err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey); |
2203 | if (err) | |
2204 | return SMP_UNSPECIFIED; | |
2205 | ||
2206 | err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type, | |
2207 | hcon->dst_type, passkey, 0); | |
191dc7fe JH |
2208 | if (err) |
2209 | return SMP_UNSPECIFIED; | |
2210 | ||
38606f14 JH |
2211 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2212 | ||
191dc7fe | 2213 | return 0; |
88ba43b6 AB |
2214 | } |
2215 | ||
f81cd823 | 2216 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 2217 | { |
c9839a11 | 2218 | struct smp_ltk *key; |
988c5997 VCG |
2219 | struct hci_conn *hcon = conn->hcon; |
2220 | ||
f3a73d97 | 2221 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 2222 | if (!key) |
f81cd823 | 2223 | return false; |
988c5997 | 2224 | |
a6f7833c | 2225 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 2226 | return false; |
4dab7864 | 2227 | |
51a8efd7 | 2228 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 2229 | return true; |
988c5997 | 2230 | |
8b76ce34 | 2231 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size); |
c9839a11 | 2232 | hcon->enc_key_size = key->enc_size; |
988c5997 | 2233 | |
fe59a05f JH |
2234 | /* We never store STKs for master role, so clear this flag */ |
2235 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
2236 | ||
f81cd823 | 2237 | return true; |
988c5997 | 2238 | } |
f1560463 | 2239 | |
35dc6f83 JH |
2240 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
2241 | enum smp_key_pref key_pref) | |
854f4727 JH |
2242 | { |
2243 | if (sec_level == BT_SECURITY_LOW) | |
2244 | return true; | |
2245 | ||
35dc6f83 JH |
2246 | /* If we're encrypted with an STK but the caller prefers using |
2247 | * LTK claim insufficient security. This way we allow the | |
2248 | * connection to be re-encrypted with an LTK, even if the LTK | |
2249 | * provides the same level of security. Only exception is if we | |
2250 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 2251 | */ |
35dc6f83 JH |
2252 | if (key_pref == SMP_USE_LTK && |
2253 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 2254 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
2255 | return false; |
2256 | ||
854f4727 JH |
2257 | if (hcon->sec_level >= sec_level) |
2258 | return true; | |
2259 | ||
2260 | return false; | |
2261 | } | |
2262 | ||
da85e5e5 | 2263 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
2264 | { |
2265 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
2266 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 2267 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 2268 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 2269 | struct smp_chan *smp; |
c05b9339 | 2270 | u8 sec_level, auth; |
88ba43b6 AB |
2271 | |
2272 | BT_DBG("conn %p", conn); | |
2273 | ||
c46b98be | 2274 | if (skb->len < sizeof(*rp)) |
38e4a915 | 2275 | return SMP_INVALID_PARAMS; |
c46b98be | 2276 | |
40bef302 | 2277 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
2278 | return SMP_CMD_NOTSUPP; |
2279 | ||
0edb14de | 2280 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 2281 | |
d7a5a11d | 2282 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
2283 | return SMP_AUTH_REQUIREMENTS; |
2284 | ||
5be5e275 | 2285 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
2286 | sec_level = BT_SECURITY_MEDIUM; |
2287 | else | |
2288 | sec_level = authreq_to_seclevel(auth); | |
2289 | ||
35dc6f83 | 2290 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
854f4727 JH |
2291 | return 0; |
2292 | ||
c7262e71 JH |
2293 | if (sec_level > hcon->pending_sec_level) |
2294 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 2295 | |
4dab7864 | 2296 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
2297 | return 0; |
2298 | ||
8aab4757 | 2299 | smp = smp_chan_create(conn); |
c29d2444 JH |
2300 | if (!smp) |
2301 | return SMP_UNSPECIFIED; | |
d26a2345 | 2302 | |
d7a5a11d | 2303 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 2304 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
2305 | return SMP_PAIRING_NOTSUPP; |
2306 | ||
88ba43b6 | 2307 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 2308 | |
da85e5e5 | 2309 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 2310 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 2311 | |
1c1def09 VCG |
2312 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2313 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2314 | |
88ba43b6 | 2315 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2316 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 2317 | |
da85e5e5 | 2318 | return 0; |
88ba43b6 AB |
2319 | } |
2320 | ||
cc110922 | 2321 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 2322 | { |
cc110922 | 2323 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 2324 | struct l2cap_chan *chan; |
0a66cf20 | 2325 | struct smp_chan *smp; |
2b64d153 | 2326 | __u8 authreq; |
fc75cc86 | 2327 | int ret; |
eb492e01 | 2328 | |
3a0259bb VCG |
2329 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
2330 | ||
0a66cf20 JH |
2331 | /* This may be NULL if there's an unexpected disconnection */ |
2332 | if (!conn) | |
2333 | return 1; | |
2334 | ||
d7a5a11d | 2335 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) |
2e65c9d2 AG |
2336 | return 1; |
2337 | ||
35dc6f83 | 2338 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 2339 | return 1; |
f1cb9af5 | 2340 | |
c7262e71 JH |
2341 | if (sec_level > hcon->pending_sec_level) |
2342 | hcon->pending_sec_level = sec_level; | |
2343 | ||
40bef302 | 2344 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
2345 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
2346 | return 0; | |
d26a2345 | 2347 | |
d8949aad JH |
2348 | chan = conn->smp; |
2349 | if (!chan) { | |
2350 | BT_ERR("SMP security requested but not available"); | |
2351 | return 1; | |
2352 | } | |
2353 | ||
fc75cc86 JH |
2354 | l2cap_chan_lock(chan); |
2355 | ||
2356 | /* If SMP is already in progress ignore this request */ | |
2357 | if (chan->data) { | |
2358 | ret = 0; | |
2359 | goto unlock; | |
2360 | } | |
d26a2345 | 2361 | |
8aab4757 | 2362 | smp = smp_chan_create(conn); |
fc75cc86 JH |
2363 | if (!smp) { |
2364 | ret = 1; | |
2365 | goto unlock; | |
2366 | } | |
2b64d153 BG |
2367 | |
2368 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 2369 | |
a62da6f1 | 2370 | if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) { |
d2eb9e10 | 2371 | authreq |= SMP_AUTH_SC; |
a62da6f1 JH |
2372 | if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED)) |
2373 | authreq |= SMP_AUTH_CT2; | |
2374 | } | |
d2eb9e10 | 2375 | |
79897d20 JH |
2376 | /* Require MITM if IO Capability allows or the security level |
2377 | * requires it. | |
2e233644 | 2378 | */ |
79897d20 | 2379 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 2380 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
2381 | authreq |= SMP_AUTH_MITM; |
2382 | ||
40bef302 | 2383 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 2384 | struct smp_cmd_pairing cp; |
f01ead31 | 2385 | |
2b64d153 | 2386 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
2387 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2388 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2389 | |
eb492e01 | 2390 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2391 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
2392 | } else { |
2393 | struct smp_cmd_security_req cp; | |
2b64d153 | 2394 | cp.auth_req = authreq; |
eb492e01 | 2395 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 2396 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
2397 | } |
2398 | ||
4a74d658 | 2399 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 2400 | ret = 0; |
edca792c | 2401 | |
fc75cc86 JH |
2402 | unlock: |
2403 | l2cap_chan_unlock(chan); | |
2404 | return ret; | |
eb492e01 AB |
2405 | } |
2406 | ||
c81d555a JH |
2407 | void smp_cancel_pairing(struct hci_conn *hcon) |
2408 | { | |
2409 | struct l2cap_conn *conn = hcon->l2cap_data; | |
2410 | struct l2cap_chan *chan; | |
2411 | struct smp_chan *smp; | |
2412 | ||
2413 | if (!conn) | |
2414 | return; | |
2415 | ||
2416 | chan = conn->smp; | |
2417 | if (!chan) | |
2418 | return; | |
2419 | ||
2420 | l2cap_chan_lock(chan); | |
2421 | ||
2422 | smp = chan->data; | |
2423 | if (smp) { | |
2424 | if (test_bit(SMP_FLAG_COMPLETE, &smp->flags)) | |
2425 | smp_failure(conn, 0); | |
2426 | else | |
2427 | smp_failure(conn, SMP_UNSPECIFIED); | |
2428 | } | |
2429 | ||
2430 | l2cap_chan_unlock(chan); | |
2431 | } | |
2432 | ||
7034b911 VCG |
2433 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2434 | { | |
16b90839 | 2435 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
2436 | struct l2cap_chan *chan = conn->smp; |
2437 | struct smp_chan *smp = chan->data; | |
16b90839 | 2438 | |
c46b98be JH |
2439 | BT_DBG("conn %p", conn); |
2440 | ||
2441 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2442 | return SMP_INVALID_PARAMS; |
c46b98be | 2443 | |
b28b4943 | 2444 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 2445 | |
16b90839 VCG |
2446 | skb_pull(skb, sizeof(*rp)); |
2447 | ||
1c1def09 | 2448 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 2449 | |
7034b911 VCG |
2450 | return 0; |
2451 | } | |
2452 | ||
2453 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
2454 | { | |
16b90839 | 2455 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
2456 | struct l2cap_chan *chan = conn->smp; |
2457 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
2458 | struct hci_dev *hdev = conn->hcon->hdev; |
2459 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 2460 | struct smp_ltk *ltk; |
c9839a11 | 2461 | u8 authenticated; |
16b90839 | 2462 | |
c46b98be JH |
2463 | BT_DBG("conn %p", conn); |
2464 | ||
2465 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2466 | return SMP_INVALID_PARAMS; |
c46b98be | 2467 | |
9747a9f3 JH |
2468 | /* Mark the information as received */ |
2469 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
2470 | ||
b28b4943 JH |
2471 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
2472 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
2473 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
2474 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 2475 | |
16b90839 | 2476 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 2477 | |
ce39fb4e | 2478 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 2479 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
2480 | authenticated, smp->tk, smp->enc_key_size, |
2481 | rp->ediv, rp->rand); | |
2482 | smp->ltk = ltk; | |
c6e81e9a | 2483 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 2484 | smp_distribute_keys(smp); |
7034b911 VCG |
2485 | |
2486 | return 0; | |
2487 | } | |
2488 | ||
fd349c02 JH |
2489 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2490 | { | |
2491 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
2492 | struct l2cap_chan *chan = conn->smp; |
2493 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2494 | |
2495 | BT_DBG(""); | |
2496 | ||
2497 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2498 | return SMP_INVALID_PARAMS; |
fd349c02 | 2499 | |
b28b4943 | 2500 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 2501 | |
fd349c02 JH |
2502 | skb_pull(skb, sizeof(*info)); |
2503 | ||
2504 | memcpy(smp->irk, info->irk, 16); | |
2505 | ||
2506 | return 0; | |
2507 | } | |
2508 | ||
2509 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
2510 | struct sk_buff *skb) | |
2511 | { | |
2512 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
2513 | struct l2cap_chan *chan = conn->smp; |
2514 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2515 | struct hci_conn *hcon = conn->hcon; |
2516 | bdaddr_t rpa; | |
2517 | ||
2518 | BT_DBG(""); | |
2519 | ||
2520 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2521 | return SMP_INVALID_PARAMS; |
fd349c02 | 2522 | |
9747a9f3 JH |
2523 | /* Mark the information as received */ |
2524 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
2525 | ||
b28b4943 JH |
2526 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
2527 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
2528 | ||
fd349c02 JH |
2529 | skb_pull(skb, sizeof(*info)); |
2530 | ||
a9a58f86 JH |
2531 | /* Strictly speaking the Core Specification (4.1) allows sending |
2532 | * an empty address which would force us to rely on just the IRK | |
2533 | * as "identity information". However, since such | |
2534 | * implementations are not known of and in order to not over | |
2535 | * complicate our implementation, simply pretend that we never | |
2536 | * received an IRK for such a device. | |
e12af489 JH |
2537 | * |
2538 | * The Identity Address must also be a Static Random or Public | |
2539 | * Address, which hci_is_identity_address() checks for. | |
a9a58f86 | 2540 | */ |
e12af489 JH |
2541 | if (!bacmp(&info->bdaddr, BDADDR_ANY) || |
2542 | !hci_is_identity_address(&info->bdaddr, info->addr_type)) { | |
a9a58f86 | 2543 | BT_ERR("Ignoring IRK with no identity address"); |
31dd624e | 2544 | goto distribute; |
a9a58f86 JH |
2545 | } |
2546 | ||
fd349c02 JH |
2547 | bacpy(&smp->id_addr, &info->bdaddr); |
2548 | smp->id_addr_type = info->addr_type; | |
2549 | ||
2550 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
2551 | bacpy(&rpa, &hcon->dst); | |
2552 | else | |
2553 | bacpy(&rpa, BDADDR_ANY); | |
2554 | ||
23d0e128 JH |
2555 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
2556 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 2557 | |
31dd624e | 2558 | distribute: |
c6e81e9a JH |
2559 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
2560 | smp_distribute_keys(smp); | |
fd349c02 JH |
2561 | |
2562 | return 0; | |
2563 | } | |
2564 | ||
7ee4ea36 MH |
2565 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2566 | { | |
2567 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
2568 | struct l2cap_chan *chan = conn->smp; |
2569 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
2570 | struct smp_csrk *csrk; |
2571 | ||
2572 | BT_DBG("conn %p", conn); | |
2573 | ||
2574 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2575 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 2576 | |
7ee4ea36 MH |
2577 | /* Mark the information as received */ |
2578 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
2579 | ||
2580 | skb_pull(skb, sizeof(*rp)); | |
2581 | ||
7ee4ea36 MH |
2582 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
2583 | if (csrk) { | |
4cd3928a JH |
2584 | if (conn->hcon->sec_level > BT_SECURITY_MEDIUM) |
2585 | csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED; | |
2586 | else | |
2587 | csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED; | |
7ee4ea36 MH |
2588 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); |
2589 | } | |
2590 | smp->csrk = csrk; | |
d6268e86 | 2591 | smp_distribute_keys(smp); |
7ee4ea36 MH |
2592 | |
2593 | return 0; | |
2594 | } | |
2595 | ||
5e3d3d9b JH |
2596 | static u8 sc_select_method(struct smp_chan *smp) |
2597 | { | |
2598 | struct l2cap_conn *conn = smp->conn; | |
2599 | struct hci_conn *hcon = conn->hcon; | |
2600 | struct smp_cmd_pairing *local, *remote; | |
2601 | u8 local_mitm, remote_mitm, local_io, remote_io, method; | |
2602 | ||
1a8bab4f JH |
2603 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) || |
2604 | test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) | |
a29b0733 JH |
2605 | return REQ_OOB; |
2606 | ||
5e3d3d9b JH |
2607 | /* The preq/prsp contain the raw Pairing Request/Response PDUs |
2608 | * which are needed as inputs to some crypto functions. To get | |
2609 | * the "struct smp_cmd_pairing" from them we need to skip the | |
2610 | * first byte which contains the opcode. | |
2611 | */ | |
2612 | if (hcon->out) { | |
2613 | local = (void *) &smp->preq[1]; | |
2614 | remote = (void *) &smp->prsp[1]; | |
2615 | } else { | |
2616 | local = (void *) &smp->prsp[1]; | |
2617 | remote = (void *) &smp->preq[1]; | |
2618 | } | |
2619 | ||
2620 | local_io = local->io_capability; | |
2621 | remote_io = remote->io_capability; | |
2622 | ||
2623 | local_mitm = (local->auth_req & SMP_AUTH_MITM); | |
2624 | remote_mitm = (remote->auth_req & SMP_AUTH_MITM); | |
2625 | ||
2626 | /* If either side wants MITM, look up the method from the table, | |
2627 | * otherwise use JUST WORKS. | |
2628 | */ | |
2629 | if (local_mitm || remote_mitm) | |
2630 | method = get_auth_method(smp, local_io, remote_io); | |
2631 | else | |
2632 | method = JUST_WORKS; | |
2633 | ||
2634 | /* Don't confirm locally initiated pairing attempts */ | |
2635 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) | |
2636 | method = JUST_WORKS; | |
2637 | ||
2638 | return method; | |
2639 | } | |
2640 | ||
d8f8edbe JH |
2641 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
2642 | { | |
2643 | struct smp_cmd_public_key *key = (void *) skb->data; | |
2644 | struct hci_conn *hcon = conn->hcon; | |
2645 | struct l2cap_chan *chan = conn->smp; | |
2646 | struct smp_chan *smp = chan->data; | |
5e3d3d9b | 2647 | struct hci_dev *hdev = hcon->hdev; |
cbbbe3e2 | 2648 | struct smp_cmd_pairing_confirm cfm; |
d8f8edbe JH |
2649 | int err; |
2650 | ||
2651 | BT_DBG("conn %p", conn); | |
2652 | ||
2653 | if (skb->len < sizeof(*key)) | |
2654 | return SMP_INVALID_PARAMS; | |
2655 | ||
2656 | memcpy(smp->remote_pk, key, 64); | |
2657 | ||
a8ca617c JH |
2658 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) { |
2659 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk, | |
2660 | smp->rr, 0, cfm.confirm_val); | |
2661 | if (err) | |
2662 | return SMP_UNSPECIFIED; | |
2663 | ||
329d8230 | 2664 | if (crypto_memneq(cfm.confirm_val, smp->pcnf, 16)) |
a8ca617c JH |
2665 | return SMP_CONFIRM_FAILED; |
2666 | } | |
2667 | ||
d8f8edbe JH |
2668 | /* Non-initiating device sends its public key after receiving |
2669 | * the key from the initiating device. | |
2670 | */ | |
2671 | if (!hcon->out) { | |
2672 | err = sc_send_public_key(smp); | |
2673 | if (err) | |
2674 | return err; | |
2675 | } | |
2676 | ||
c7a3d57d | 2677 | SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk); |
e091526d | 2678 | SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32); |
d8f8edbe | 2679 | |
58771c1c | 2680 | if (!compute_ecdh_secret(smp->remote_pk, smp->local_sk, smp->dhkey)) |
d8f8edbe JH |
2681 | return SMP_UNSPECIFIED; |
2682 | ||
c7a3d57d | 2683 | SMP_DBG("DHKey %32phN", smp->dhkey); |
d8f8edbe JH |
2684 | |
2685 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
2686 | ||
5e3d3d9b JH |
2687 | smp->method = sc_select_method(smp); |
2688 | ||
2689 | BT_DBG("%s selected method 0x%02x", hdev->name, smp->method); | |
2690 | ||
2691 | /* JUST_WORKS and JUST_CFM result in an unauthenticated key */ | |
2692 | if (smp->method == JUST_WORKS || smp->method == JUST_CFM) | |
2693 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; | |
2694 | else | |
2695 | hcon->pending_sec_level = BT_SECURITY_FIPS; | |
2696 | ||
329d8230 | 2697 | if (!crypto_memneq(debug_pk, smp->remote_pk, 64)) |
aeb7d461 JH |
2698 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); |
2699 | ||
38606f14 JH |
2700 | if (smp->method == DSP_PASSKEY) { |
2701 | get_random_bytes(&hcon->passkey_notify, | |
2702 | sizeof(hcon->passkey_notify)); | |
2703 | hcon->passkey_notify %= 1000000; | |
2704 | hcon->passkey_entered = 0; | |
2705 | smp->passkey_round = 0; | |
2706 | if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type, | |
2707 | hcon->dst_type, | |
2708 | hcon->passkey_notify, | |
2709 | hcon->passkey_entered)) | |
2710 | return SMP_UNSPECIFIED; | |
2711 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2712 | return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY); | |
2713 | } | |
2714 | ||
94ea7257 | 2715 | if (smp->method == REQ_OOB) { |
a29b0733 JH |
2716 | if (hcon->out) |
2717 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2718 | sizeof(smp->prnd), smp->prnd); | |
2719 | ||
2720 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2721 | ||
2722 | return 0; | |
2723 | } | |
2724 | ||
38606f14 JH |
2725 | if (hcon->out) |
2726 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2727 | ||
2728 | if (smp->method == REQ_PASSKEY) { | |
2729 | if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type, | |
2730 | hcon->dst_type)) | |
2731 | return SMP_UNSPECIFIED; | |
2732 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2733 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
2734 | return 0; | |
2735 | } | |
2736 | ||
cbbbe3e2 JH |
2737 | /* The Initiating device waits for the non-initiating device to |
2738 | * send the confirm value. | |
2739 | */ | |
2740 | if (conn->hcon->out) | |
2741 | return 0; | |
2742 | ||
2743 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, | |
2744 | 0, cfm.confirm_val); | |
2745 | if (err) | |
2746 | return SMP_UNSPECIFIED; | |
2747 | ||
2748 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
2749 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2750 | ||
d8f8edbe JH |
2751 | return 0; |
2752 | } | |
2753 | ||
6433a9a2 JH |
2754 | static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb) |
2755 | { | |
2756 | struct smp_cmd_dhkey_check *check = (void *) skb->data; | |
2757 | struct l2cap_chan *chan = conn->smp; | |
2758 | struct hci_conn *hcon = conn->hcon; | |
2759 | struct smp_chan *smp = chan->data; | |
2760 | u8 a[7], b[7], *local_addr, *remote_addr; | |
2761 | u8 io_cap[3], r[16], e[16]; | |
2762 | int err; | |
2763 | ||
2764 | BT_DBG("conn %p", conn); | |
2765 | ||
2766 | if (skb->len < sizeof(*check)) | |
2767 | return SMP_INVALID_PARAMS; | |
2768 | ||
2769 | memcpy(a, &hcon->init_addr, 6); | |
2770 | memcpy(b, &hcon->resp_addr, 6); | |
2771 | a[6] = hcon->init_addr_type; | |
2772 | b[6] = hcon->resp_addr_type; | |
2773 | ||
2774 | if (hcon->out) { | |
2775 | local_addr = a; | |
2776 | remote_addr = b; | |
2777 | memcpy(io_cap, &smp->prsp[1], 3); | |
2778 | } else { | |
2779 | local_addr = b; | |
2780 | remote_addr = a; | |
2781 | memcpy(io_cap, &smp->preq[1], 3); | |
2782 | } | |
2783 | ||
2784 | memset(r, 0, sizeof(r)); | |
2785 | ||
38606f14 JH |
2786 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2787 | put_unaligned_le32(hcon->passkey_notify, r); | |
882fafad JH |
2788 | else if (smp->method == REQ_OOB) |
2789 | memcpy(r, smp->lr, 16); | |
38606f14 | 2790 | |
6433a9a2 JH |
2791 | err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r, |
2792 | io_cap, remote_addr, local_addr, e); | |
2793 | if (err) | |
2794 | return SMP_UNSPECIFIED; | |
2795 | ||
329d8230 | 2796 | if (crypto_memneq(check->e, e, 16)) |
6433a9a2 JH |
2797 | return SMP_DHKEY_CHECK_FAILED; |
2798 | ||
d3e54a87 JH |
2799 | if (!hcon->out) { |
2800 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
2801 | set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags); | |
2802 | return 0; | |
2803 | } | |
d378a2d7 | 2804 | |
d3e54a87 JH |
2805 | /* Slave sends DHKey check as response to master */ |
2806 | sc_dhkey_check(smp); | |
2807 | } | |
d378a2d7 | 2808 | |
d3e54a87 | 2809 | sc_add_ltk(smp); |
6433a9a2 JH |
2810 | |
2811 | if (hcon->out) { | |
8b76ce34 | 2812 | hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size); |
6433a9a2 JH |
2813 | hcon->enc_key_size = smp->enc_key_size; |
2814 | } | |
2815 | ||
2816 | return 0; | |
2817 | } | |
2818 | ||
1408bb6e JH |
2819 | static int smp_cmd_keypress_notify(struct l2cap_conn *conn, |
2820 | struct sk_buff *skb) | |
2821 | { | |
2822 | struct smp_cmd_keypress_notify *kp = (void *) skb->data; | |
2823 | ||
2824 | BT_DBG("value 0x%02x", kp->value); | |
2825 | ||
2826 | return 0; | |
2827 | } | |
2828 | ||
4befb867 | 2829 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 2830 | { |
5d88cc73 | 2831 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 2832 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 2833 | struct smp_chan *smp; |
92381f5c | 2834 | __u8 code, reason; |
eb492e01 AB |
2835 | int err = 0; |
2836 | ||
8ae9b984 | 2837 | if (skb->len < 1) |
92381f5c | 2838 | return -EILSEQ; |
92381f5c | 2839 | |
d7a5a11d | 2840 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) { |
2e65c9d2 AG |
2841 | reason = SMP_PAIRING_NOTSUPP; |
2842 | goto done; | |
2843 | } | |
2844 | ||
92381f5c | 2845 | code = skb->data[0]; |
eb492e01 AB |
2846 | skb_pull(skb, sizeof(code)); |
2847 | ||
b28b4943 JH |
2848 | smp = chan->data; |
2849 | ||
2850 | if (code > SMP_CMD_MAX) | |
2851 | goto drop; | |
2852 | ||
24bd0bd9 | 2853 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
2854 | goto drop; |
2855 | ||
2856 | /* If we don't have a context the only allowed commands are | |
2857 | * pairing request and security request. | |
8cf9fa12 | 2858 | */ |
b28b4943 JH |
2859 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
2860 | goto drop; | |
8cf9fa12 | 2861 | |
eb492e01 AB |
2862 | switch (code) { |
2863 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 2864 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
2865 | break; |
2866 | ||
2867 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 2868 | smp_failure(conn, 0); |
da85e5e5 | 2869 | err = -EPERM; |
eb492e01 AB |
2870 | break; |
2871 | ||
2872 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 2873 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
2874 | break; |
2875 | ||
2876 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 2877 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
2878 | break; |
2879 | ||
eb492e01 | 2880 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 2881 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
2882 | break; |
2883 | ||
eb492e01 | 2884 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 2885 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
2886 | break; |
2887 | ||
eb492e01 | 2888 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
2889 | reason = smp_cmd_encrypt_info(conn, skb); |
2890 | break; | |
2891 | ||
eb492e01 | 2892 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
2893 | reason = smp_cmd_master_ident(conn, skb); |
2894 | break; | |
2895 | ||
eb492e01 | 2896 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
2897 | reason = smp_cmd_ident_info(conn, skb); |
2898 | break; | |
2899 | ||
eb492e01 | 2900 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
2901 | reason = smp_cmd_ident_addr_info(conn, skb); |
2902 | break; | |
2903 | ||
eb492e01 | 2904 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 2905 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
2906 | break; |
2907 | ||
d8f8edbe JH |
2908 | case SMP_CMD_PUBLIC_KEY: |
2909 | reason = smp_cmd_public_key(conn, skb); | |
2910 | break; | |
2911 | ||
6433a9a2 JH |
2912 | case SMP_CMD_DHKEY_CHECK: |
2913 | reason = smp_cmd_dhkey_check(conn, skb); | |
2914 | break; | |
2915 | ||
1408bb6e JH |
2916 | case SMP_CMD_KEYPRESS_NOTIFY: |
2917 | reason = smp_cmd_keypress_notify(conn, skb); | |
2918 | break; | |
2919 | ||
eb492e01 AB |
2920 | default: |
2921 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 2922 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 2923 | goto done; |
eb492e01 AB |
2924 | } |
2925 | ||
3a0259bb | 2926 | done: |
9b7b18ef JH |
2927 | if (!err) { |
2928 | if (reason) | |
2929 | smp_failure(conn, reason); | |
8ae9b984 | 2930 | kfree_skb(skb); |
9b7b18ef JH |
2931 | } |
2932 | ||
eb492e01 | 2933 | return err; |
b28b4943 JH |
2934 | |
2935 | drop: | |
2936 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
2937 | code, &hcon->dst); | |
2938 | kfree_skb(skb); | |
2939 | return 0; | |
eb492e01 | 2940 | } |
7034b911 | 2941 | |
70db83c4 JH |
2942 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
2943 | { | |
2944 | struct l2cap_conn *conn = chan->conn; | |
2945 | ||
2946 | BT_DBG("chan %p", chan); | |
2947 | ||
fc75cc86 | 2948 | if (chan->data) |
5d88cc73 | 2949 | smp_chan_destroy(conn); |
5d88cc73 | 2950 | |
70db83c4 JH |
2951 | conn->smp = NULL; |
2952 | l2cap_chan_put(chan); | |
2953 | } | |
2954 | ||
b5ae344d JH |
2955 | static void bredr_pairing(struct l2cap_chan *chan) |
2956 | { | |
2957 | struct l2cap_conn *conn = chan->conn; | |
2958 | struct hci_conn *hcon = conn->hcon; | |
2959 | struct hci_dev *hdev = hcon->hdev; | |
2960 | struct smp_cmd_pairing req; | |
2961 | struct smp_chan *smp; | |
2962 | ||
2963 | BT_DBG("chan %p", chan); | |
2964 | ||
2965 | /* Only new pairings are interesting */ | |
2966 | if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags)) | |
2967 | return; | |
2968 | ||
2969 | /* Don't bother if we're not encrypted */ | |
2970 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
2971 | return; | |
2972 | ||
2973 | /* Only master may initiate SMP over BR/EDR */ | |
2974 | if (hcon->role != HCI_ROLE_MASTER) | |
2975 | return; | |
2976 | ||
2977 | /* Secure Connections support must be enabled */ | |
d7a5a11d | 2978 | if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED)) |
b5ae344d JH |
2979 | return; |
2980 | ||
2981 | /* BR/EDR must use Secure Connections for SMP */ | |
2982 | if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) && | |
b7cb93e5 | 2983 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
2984 | return; |
2985 | ||
2986 | /* If our LE support is not enabled don't do anything */ | |
d7a5a11d | 2987 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
b5ae344d JH |
2988 | return; |
2989 | ||
2990 | /* Don't bother if remote LE support is not enabled */ | |
2991 | if (!lmp_host_le_capable(hcon)) | |
2992 | return; | |
2993 | ||
2994 | /* Remote must support SMP fixed chan for BR/EDR */ | |
2995 | if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR)) | |
2996 | return; | |
2997 | ||
2998 | /* Don't bother if SMP is already ongoing */ | |
2999 | if (chan->data) | |
3000 | return; | |
3001 | ||
3002 | smp = smp_chan_create(conn); | |
3003 | if (!smp) { | |
3004 | BT_ERR("%s unable to create SMP context for BR/EDR", | |
3005 | hdev->name); | |
3006 | return; | |
3007 | } | |
3008 | ||
3009 | set_bit(SMP_FLAG_SC, &smp->flags); | |
3010 | ||
3011 | BT_DBG("%s starting SMP over BR/EDR", hdev->name); | |
3012 | ||
3013 | /* Prepare and send the BR/EDR SMP Pairing Request */ | |
3014 | build_bredr_pairing_cmd(smp, &req, NULL); | |
3015 | ||
3016 | smp->preq[0] = SMP_CMD_PAIRING_REQ; | |
3017 | memcpy(&smp->preq[1], &req, sizeof(req)); | |
3018 | ||
3019 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req); | |
3020 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); | |
3021 | } | |
3022 | ||
44f1a7ab JH |
3023 | static void smp_resume_cb(struct l2cap_chan *chan) |
3024 | { | |
b68fda68 | 3025 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
3026 | struct l2cap_conn *conn = chan->conn; |
3027 | struct hci_conn *hcon = conn->hcon; | |
3028 | ||
3029 | BT_DBG("chan %p", chan); | |
3030 | ||
b5ae344d JH |
3031 | if (hcon->type == ACL_LINK) { |
3032 | bredr_pairing(chan); | |
ef8efe4b | 3033 | return; |
b5ae344d | 3034 | } |
ef8efe4b | 3035 | |
86d1407c JH |
3036 | if (!smp) |
3037 | return; | |
b68fda68 | 3038 | |
84bc0db5 JH |
3039 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
3040 | return; | |
3041 | ||
86d1407c JH |
3042 | cancel_delayed_work(&smp->security_timer); |
3043 | ||
d6268e86 | 3044 | smp_distribute_keys(smp); |
44f1a7ab JH |
3045 | } |
3046 | ||
70db83c4 JH |
3047 | static void smp_ready_cb(struct l2cap_chan *chan) |
3048 | { | |
3049 | struct l2cap_conn *conn = chan->conn; | |
b5ae344d | 3050 | struct hci_conn *hcon = conn->hcon; |
70db83c4 JH |
3051 | |
3052 | BT_DBG("chan %p", chan); | |
3053 | ||
7883746b JH |
3054 | /* No need to call l2cap_chan_hold() here since we already own |
3055 | * the reference taken in smp_new_conn_cb(). This is just the | |
3056 | * first time that we tie it to a specific pointer. The code in | |
3057 | * l2cap_core.c ensures that there's no risk this function wont | |
3058 | * get called if smp_new_conn_cb was previously called. | |
3059 | */ | |
70db83c4 | 3060 | conn->smp = chan; |
b5ae344d JH |
3061 | |
3062 | if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
3063 | bredr_pairing(chan); | |
70db83c4 JH |
3064 | } |
3065 | ||
4befb867 JH |
3066 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
3067 | { | |
3068 | int err; | |
3069 | ||
3070 | BT_DBG("chan %p", chan); | |
3071 | ||
3072 | err = smp_sig_channel(chan, skb); | |
3073 | if (err) { | |
b68fda68 | 3074 | struct smp_chan *smp = chan->data; |
4befb867 | 3075 | |
b68fda68 JH |
3076 | if (smp) |
3077 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 3078 | |
1e91c29e | 3079 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
3080 | } |
3081 | ||
3082 | return err; | |
3083 | } | |
3084 | ||
70db83c4 JH |
3085 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
3086 | unsigned long hdr_len, | |
3087 | unsigned long len, int nb) | |
3088 | { | |
3089 | struct sk_buff *skb; | |
3090 | ||
3091 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
3092 | if (!skb) | |
3093 | return ERR_PTR(-ENOMEM); | |
3094 | ||
3095 | skb->priority = HCI_PRIO_MAX; | |
a4368ff3 | 3096 | bt_cb(skb)->l2cap.chan = chan; |
70db83c4 JH |
3097 | |
3098 | return skb; | |
3099 | } | |
3100 | ||
3101 | static const struct l2cap_ops smp_chan_ops = { | |
3102 | .name = "Security Manager", | |
3103 | .ready = smp_ready_cb, | |
5d88cc73 | 3104 | .recv = smp_recv_cb, |
70db83c4 JH |
3105 | .alloc_skb = smp_alloc_skb_cb, |
3106 | .teardown = smp_teardown_cb, | |
44f1a7ab | 3107 | .resume = smp_resume_cb, |
70db83c4 JH |
3108 | |
3109 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
3110 | .state_change = l2cap_chan_no_state_change, |
3111 | .close = l2cap_chan_no_close, | |
3112 | .defer = l2cap_chan_no_defer, | |
3113 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
3114 | .set_shutdown = l2cap_chan_no_set_shutdown, |
3115 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3116 | }; |
3117 | ||
3118 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
3119 | { | |
3120 | struct l2cap_chan *chan; | |
3121 | ||
3122 | BT_DBG("pchan %p", pchan); | |
3123 | ||
3124 | chan = l2cap_chan_create(); | |
3125 | if (!chan) | |
3126 | return NULL; | |
3127 | ||
3128 | chan->chan_type = pchan->chan_type; | |
3129 | chan->ops = &smp_chan_ops; | |
3130 | chan->scid = pchan->scid; | |
3131 | chan->dcid = chan->scid; | |
3132 | chan->imtu = pchan->imtu; | |
3133 | chan->omtu = pchan->omtu; | |
3134 | chan->mode = pchan->mode; | |
3135 | ||
abe84903 JH |
3136 | /* Other L2CAP channels may request SMP routines in order to |
3137 | * change the security level. This means that the SMP channel | |
3138 | * lock must be considered in its own category to avoid lockdep | |
3139 | * warnings. | |
3140 | */ | |
3141 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
3142 | ||
70db83c4 JH |
3143 | BT_DBG("created chan %p", chan); |
3144 | ||
3145 | return chan; | |
3146 | } | |
3147 | ||
3148 | static const struct l2cap_ops smp_root_chan_ops = { | |
3149 | .name = "Security Manager Root", | |
3150 | .new_connection = smp_new_conn_cb, | |
3151 | ||
3152 | /* None of these are implemented for the root channel */ | |
3153 | .close = l2cap_chan_no_close, | |
3154 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
3155 | .recv = l2cap_chan_no_recv, | |
3156 | .state_change = l2cap_chan_no_state_change, | |
3157 | .teardown = l2cap_chan_no_teardown, | |
3158 | .ready = l2cap_chan_no_ready, | |
3159 | .defer = l2cap_chan_no_defer, | |
3160 | .suspend = l2cap_chan_no_suspend, | |
3161 | .resume = l2cap_chan_no_resume, | |
3162 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
3163 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3164 | }; |
3165 | ||
ef8efe4b | 3166 | static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) |
711eafe3 | 3167 | { |
70db83c4 | 3168 | struct l2cap_chan *chan; |
88a479d9 | 3169 | struct smp_dev *smp; |
a4770e11 | 3170 | struct crypto_cipher *tfm_aes; |
71af2f6b | 3171 | struct crypto_shash *tfm_cmac; |
70db83c4 | 3172 | |
ef8efe4b | 3173 | if (cid == L2CAP_CID_SMP_BREDR) { |
88a479d9 | 3174 | smp = NULL; |
ef8efe4b JH |
3175 | goto create_chan; |
3176 | } | |
711eafe3 | 3177 | |
88a479d9 MH |
3178 | smp = kzalloc(sizeof(*smp), GFP_KERNEL); |
3179 | if (!smp) | |
3180 | return ERR_PTR(-ENOMEM); | |
3181 | ||
a4770e11 | 3182 | tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
defce9e8 | 3183 | if (IS_ERR(tfm_aes)) { |
a4770e11 | 3184 | BT_ERR("Unable to create AES crypto context"); |
88a479d9 | 3185 | kzfree(smp); |
fe700771 | 3186 | return ERR_CAST(tfm_aes); |
711eafe3 JH |
3187 | } |
3188 | ||
71af2f6b | 3189 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
6e2dc6d1 MH |
3190 | if (IS_ERR(tfm_cmac)) { |
3191 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 3192 | crypto_free_cipher(tfm_aes); |
6e2dc6d1 MH |
3193 | kzfree(smp); |
3194 | return ERR_CAST(tfm_cmac); | |
3195 | } | |
3196 | ||
88a479d9 | 3197 | smp->tfm_aes = tfm_aes; |
6e2dc6d1 | 3198 | smp->tfm_cmac = tfm_cmac; |
b1f663c9 | 3199 | smp->min_key_size = SMP_MIN_ENC_KEY_SIZE; |
2fd36558 | 3200 | smp->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
88a479d9 | 3201 | |
ef8efe4b | 3202 | create_chan: |
70db83c4 JH |
3203 | chan = l2cap_chan_create(); |
3204 | if (!chan) { | |
63511f6d | 3205 | if (smp) { |
a4770e11 | 3206 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 3207 | crypto_free_shash(smp->tfm_cmac); |
63511f6d MH |
3208 | kzfree(smp); |
3209 | } | |
ef8efe4b | 3210 | return ERR_PTR(-ENOMEM); |
70db83c4 JH |
3211 | } |
3212 | ||
88a479d9 | 3213 | chan->data = smp; |
defce9e8 | 3214 | |
ef8efe4b | 3215 | l2cap_add_scid(chan, cid); |
70db83c4 JH |
3216 | |
3217 | l2cap_chan_set_defaults(chan); | |
3218 | ||
157029ba | 3219 | if (cid == L2CAP_CID_SMP) { |
39e3e744 JH |
3220 | u8 bdaddr_type; |
3221 | ||
3222 | hci_copy_identity_address(hdev, &chan->src, &bdaddr_type); | |
3223 | ||
3224 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) | |
157029ba | 3225 | chan->src_type = BDADDR_LE_PUBLIC; |
39e3e744 JH |
3226 | else |
3227 | chan->src_type = BDADDR_LE_RANDOM; | |
157029ba MH |
3228 | } else { |
3229 | bacpy(&chan->src, &hdev->bdaddr); | |
ef8efe4b | 3230 | chan->src_type = BDADDR_BREDR; |
157029ba MH |
3231 | } |
3232 | ||
70db83c4 JH |
3233 | chan->state = BT_LISTEN; |
3234 | chan->mode = L2CAP_MODE_BASIC; | |
3235 | chan->imtu = L2CAP_DEFAULT_MTU; | |
3236 | chan->ops = &smp_root_chan_ops; | |
3237 | ||
abe84903 JH |
3238 | /* Set correct nesting level for a parent/listening channel */ |
3239 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
3240 | ||
ef8efe4b | 3241 | return chan; |
711eafe3 JH |
3242 | } |
3243 | ||
ef8efe4b | 3244 | static void smp_del_chan(struct l2cap_chan *chan) |
711eafe3 | 3245 | { |
88a479d9 | 3246 | struct smp_dev *smp; |
70db83c4 | 3247 | |
ef8efe4b | 3248 | BT_DBG("chan %p", chan); |
711eafe3 | 3249 | |
88a479d9 MH |
3250 | smp = chan->data; |
3251 | if (smp) { | |
defce9e8 | 3252 | chan->data = NULL; |
a4770e11 | 3253 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 3254 | crypto_free_shash(smp->tfm_cmac); |
88a479d9 | 3255 | kzfree(smp); |
711eafe3 | 3256 | } |
70db83c4 | 3257 | |
70db83c4 | 3258 | l2cap_chan_put(chan); |
711eafe3 | 3259 | } |
ef8efe4b | 3260 | |
300acfde MH |
3261 | static ssize_t force_bredr_smp_read(struct file *file, |
3262 | char __user *user_buf, | |
3263 | size_t count, loff_t *ppos) | |
3264 | { | |
3265 | struct hci_dev *hdev = file->private_data; | |
3266 | char buf[3]; | |
3267 | ||
b7cb93e5 | 3268 | buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; |
300acfde MH |
3269 | buf[1] = '\n'; |
3270 | buf[2] = '\0'; | |
3271 | return simple_read_from_buffer(user_buf, count, ppos, buf, 2); | |
3272 | } | |
3273 | ||
3274 | static ssize_t force_bredr_smp_write(struct file *file, | |
3275 | const char __user *user_buf, | |
3276 | size_t count, loff_t *ppos) | |
3277 | { | |
3278 | struct hci_dev *hdev = file->private_data; | |
3279 | char buf[32]; | |
3280 | size_t buf_size = min(count, (sizeof(buf)-1)); | |
3281 | bool enable; | |
3282 | ||
3283 | if (copy_from_user(buf, user_buf, buf_size)) | |
3284 | return -EFAULT; | |
3285 | ||
3286 | buf[buf_size] = '\0'; | |
3287 | if (strtobool(buf, &enable)) | |
3288 | return -EINVAL; | |
3289 | ||
b7cb93e5 | 3290 | if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
300acfde MH |
3291 | return -EALREADY; |
3292 | ||
3293 | if (enable) { | |
3294 | struct l2cap_chan *chan; | |
3295 | ||
3296 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); | |
3297 | if (IS_ERR(chan)) | |
3298 | return PTR_ERR(chan); | |
3299 | ||
3300 | hdev->smp_bredr_data = chan; | |
3301 | } else { | |
3302 | struct l2cap_chan *chan; | |
3303 | ||
3304 | chan = hdev->smp_bredr_data; | |
3305 | hdev->smp_bredr_data = NULL; | |
3306 | smp_del_chan(chan); | |
3307 | } | |
3308 | ||
b7cb93e5 | 3309 | hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); |
300acfde MH |
3310 | |
3311 | return count; | |
3312 | } | |
3313 | ||
3314 | static const struct file_operations force_bredr_smp_fops = { | |
3315 | .open = simple_open, | |
3316 | .read = force_bredr_smp_read, | |
3317 | .write = force_bredr_smp_write, | |
3318 | .llseek = default_llseek, | |
3319 | }; | |
3320 | ||
b1f663c9 JH |
3321 | static ssize_t le_min_key_size_read(struct file *file, |
3322 | char __user *user_buf, | |
3323 | size_t count, loff_t *ppos) | |
3324 | { | |
3325 | struct hci_dev *hdev = file->private_data; | |
3326 | char buf[4]; | |
3327 | ||
3328 | snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size); | |
3329 | ||
3330 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3331 | } | |
3332 | ||
3333 | static ssize_t le_min_key_size_write(struct file *file, | |
3334 | const char __user *user_buf, | |
3335 | size_t count, loff_t *ppos) | |
3336 | { | |
3337 | struct hci_dev *hdev = file->private_data; | |
3338 | char buf[32]; | |
3339 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3340 | u8 key_size; | |
3341 | ||
3342 | if (copy_from_user(buf, user_buf, buf_size)) | |
3343 | return -EFAULT; | |
3344 | ||
3345 | buf[buf_size] = '\0'; | |
3346 | ||
3347 | sscanf(buf, "%hhu", &key_size); | |
3348 | ||
3349 | if (key_size > SMP_DEV(hdev)->max_key_size || | |
3350 | key_size < SMP_MIN_ENC_KEY_SIZE) | |
3351 | return -EINVAL; | |
3352 | ||
3353 | SMP_DEV(hdev)->min_key_size = key_size; | |
3354 | ||
3355 | return count; | |
3356 | } | |
3357 | ||
3358 | static const struct file_operations le_min_key_size_fops = { | |
3359 | .open = simple_open, | |
3360 | .read = le_min_key_size_read, | |
3361 | .write = le_min_key_size_write, | |
3362 | .llseek = default_llseek, | |
3363 | }; | |
3364 | ||
2fd36558 JH |
3365 | static ssize_t le_max_key_size_read(struct file *file, |
3366 | char __user *user_buf, | |
3367 | size_t count, loff_t *ppos) | |
3368 | { | |
3369 | struct hci_dev *hdev = file->private_data; | |
3370 | char buf[4]; | |
3371 | ||
3372 | snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->max_key_size); | |
3373 | ||
3374 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3375 | } | |
3376 | ||
3377 | static ssize_t le_max_key_size_write(struct file *file, | |
3378 | const char __user *user_buf, | |
3379 | size_t count, loff_t *ppos) | |
3380 | { | |
3381 | struct hci_dev *hdev = file->private_data; | |
3382 | char buf[32]; | |
3383 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3384 | u8 key_size; | |
3385 | ||
3386 | if (copy_from_user(buf, user_buf, buf_size)) | |
3387 | return -EFAULT; | |
3388 | ||
3389 | buf[buf_size] = '\0'; | |
3390 | ||
3391 | sscanf(buf, "%hhu", &key_size); | |
3392 | ||
b1f663c9 JH |
3393 | if (key_size > SMP_MAX_ENC_KEY_SIZE || |
3394 | key_size < SMP_DEV(hdev)->min_key_size) | |
2fd36558 JH |
3395 | return -EINVAL; |
3396 | ||
3397 | SMP_DEV(hdev)->max_key_size = key_size; | |
3398 | ||
3399 | return count; | |
3400 | } | |
3401 | ||
3402 | static const struct file_operations le_max_key_size_fops = { | |
3403 | .open = simple_open, | |
3404 | .read = le_max_key_size_read, | |
3405 | .write = le_max_key_size_write, | |
3406 | .llseek = default_llseek, | |
3407 | }; | |
3408 | ||
ef8efe4b JH |
3409 | int smp_register(struct hci_dev *hdev) |
3410 | { | |
3411 | struct l2cap_chan *chan; | |
3412 | ||
3413 | BT_DBG("%s", hdev->name); | |
3414 | ||
7e7ec445 MH |
3415 | /* If the controller does not support Low Energy operation, then |
3416 | * there is also no need to register any SMP channel. | |
3417 | */ | |
3418 | if (!lmp_le_capable(hdev)) | |
3419 | return 0; | |
3420 | ||
2b8df323 MH |
3421 | if (WARN_ON(hdev->smp_data)) { |
3422 | chan = hdev->smp_data; | |
3423 | hdev->smp_data = NULL; | |
3424 | smp_del_chan(chan); | |
3425 | } | |
3426 | ||
ef8efe4b JH |
3427 | chan = smp_add_cid(hdev, L2CAP_CID_SMP); |
3428 | if (IS_ERR(chan)) | |
3429 | return PTR_ERR(chan); | |
3430 | ||
3431 | hdev->smp_data = chan; | |
3432 | ||
b1f663c9 JH |
3433 | debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev, |
3434 | &le_min_key_size_fops); | |
2fd36558 JH |
3435 | debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev, |
3436 | &le_max_key_size_fops); | |
3437 | ||
300acfde MH |
3438 | /* If the controller does not support BR/EDR Secure Connections |
3439 | * feature, then the BR/EDR SMP channel shall not be present. | |
3440 | * | |
3441 | * To test this with Bluetooth 4.0 controllers, create a debugfs | |
3442 | * switch that allows forcing BR/EDR SMP support and accepting | |
3443 | * cross-transport pairing on non-AES encrypted connections. | |
3444 | */ | |
3445 | if (!lmp_sc_capable(hdev)) { | |
3446 | debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, | |
3447 | hdev, &force_bredr_smp_fops); | |
83ebb9ec SJ |
3448 | |
3449 | /* Flag can be already set here (due to power toggle) */ | |
3450 | if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) | |
3451 | return 0; | |
300acfde | 3452 | } |
ef8efe4b | 3453 | |
2b8df323 MH |
3454 | if (WARN_ON(hdev->smp_bredr_data)) { |
3455 | chan = hdev->smp_bredr_data; | |
3456 | hdev->smp_bredr_data = NULL; | |
3457 | smp_del_chan(chan); | |
3458 | } | |
3459 | ||
ef8efe4b JH |
3460 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); |
3461 | if (IS_ERR(chan)) { | |
3462 | int err = PTR_ERR(chan); | |
3463 | chan = hdev->smp_data; | |
3464 | hdev->smp_data = NULL; | |
3465 | smp_del_chan(chan); | |
3466 | return err; | |
3467 | } | |
3468 | ||
3469 | hdev->smp_bredr_data = chan; | |
3470 | ||
3471 | return 0; | |
3472 | } | |
3473 | ||
3474 | void smp_unregister(struct hci_dev *hdev) | |
3475 | { | |
3476 | struct l2cap_chan *chan; | |
3477 | ||
3478 | if (hdev->smp_bredr_data) { | |
3479 | chan = hdev->smp_bredr_data; | |
3480 | hdev->smp_bredr_data = NULL; | |
3481 | smp_del_chan(chan); | |
3482 | } | |
3483 | ||
3484 | if (hdev->smp_data) { | |
3485 | chan = hdev->smp_data; | |
3486 | hdev->smp_data = NULL; | |
3487 | smp_del_chan(chan); | |
3488 | } | |
3489 | } | |
0a2b0f04 JH |
3490 | |
3491 | #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP) | |
3492 | ||
71653eb6 MH |
3493 | static inline void swap_digits(u64 *in, u64 *out, unsigned int ndigits) |
3494 | { | |
3495 | int i; | |
3496 | ||
3497 | for (i = 0; i < ndigits; i++) | |
3498 | out[i] = __swab64(in[ndigits - 1 - i]); | |
3499 | } | |
3500 | ||
3501 | static int __init test_debug_key(void) | |
3502 | { | |
3503 | u8 pk[64], sk[32]; | |
3504 | ||
3505 | swap_digits((u64 *)debug_sk, (u64 *)sk, 4); | |
3506 | ||
3507 | if (!generate_ecdh_keys(pk, sk)) | |
3508 | return -EINVAL; | |
3509 | ||
329d8230 | 3510 | if (crypto_memneq(sk, debug_sk, 32)) |
71653eb6 MH |
3511 | return -EINVAL; |
3512 | ||
329d8230 | 3513 | if (crypto_memneq(pk, debug_pk, 64)) |
71653eb6 MH |
3514 | return -EINVAL; |
3515 | ||
3516 | return 0; | |
3517 | } | |
3518 | ||
a4770e11 | 3519 | static int __init test_ah(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3520 | { |
3521 | const u8 irk[16] = { | |
3522 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3523 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3524 | const u8 r[3] = { 0x94, 0x81, 0x70 }; | |
3525 | const u8 exp[3] = { 0xaa, 0xfb, 0x0d }; | |
3526 | u8 res[3]; | |
3527 | int err; | |
3528 | ||
3529 | err = smp_ah(tfm_aes, irk, r, res); | |
3530 | if (err) | |
3531 | return err; | |
3532 | ||
329d8230 | 3533 | if (crypto_memneq(res, exp, 3)) |
cfc4198e JH |
3534 | return -EINVAL; |
3535 | ||
3536 | return 0; | |
3537 | } | |
3538 | ||
a4770e11 | 3539 | static int __init test_c1(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3540 | { |
3541 | const u8 k[16] = { | |
3542 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3543 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3544 | const u8 r[16] = { | |
3545 | 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63, | |
3546 | 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 }; | |
3547 | const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 }; | |
3548 | const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 }; | |
3549 | const u8 _iat = 0x01; | |
3550 | const u8 _rat = 0x00; | |
3551 | const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } }; | |
3552 | const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } }; | |
3553 | const u8 exp[16] = { | |
3554 | 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2, | |
3555 | 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e }; | |
3556 | u8 res[16]; | |
3557 | int err; | |
3558 | ||
3559 | err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res); | |
3560 | if (err) | |
3561 | return err; | |
3562 | ||
329d8230 | 3563 | if (crypto_memneq(res, exp, 16)) |
cfc4198e JH |
3564 | return -EINVAL; |
3565 | ||
3566 | return 0; | |
3567 | } | |
3568 | ||
a4770e11 | 3569 | static int __init test_s1(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3570 | { |
3571 | const u8 k[16] = { | |
3572 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3573 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3574 | const u8 r1[16] = { | |
3575 | 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }; | |
3576 | const u8 r2[16] = { | |
3577 | 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 }; | |
3578 | const u8 exp[16] = { | |
3579 | 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b, | |
3580 | 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a }; | |
3581 | u8 res[16]; | |
3582 | int err; | |
3583 | ||
3584 | err = smp_s1(tfm_aes, k, r1, r2, res); | |
3585 | if (err) | |
3586 | return err; | |
3587 | ||
329d8230 | 3588 | if (crypto_memneq(res, exp, 16)) |
cfc4198e JH |
3589 | return -EINVAL; |
3590 | ||
3591 | return 0; | |
3592 | } | |
3593 | ||
71af2f6b | 3594 | static int __init test_f4(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3595 | { |
3596 | const u8 u[32] = { | |
3597 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3598 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3599 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3600 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3601 | const u8 v[32] = { | |
3602 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3603 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3604 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3605 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3606 | const u8 x[16] = { | |
3607 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3608 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3609 | const u8 z = 0x00; | |
3610 | const u8 exp[16] = { | |
3611 | 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1, | |
3612 | 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 }; | |
3613 | u8 res[16]; | |
3614 | int err; | |
3615 | ||
3616 | err = smp_f4(tfm_cmac, u, v, x, z, res); | |
3617 | if (err) | |
3618 | return err; | |
3619 | ||
329d8230 | 3620 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3621 | return -EINVAL; |
3622 | ||
3623 | return 0; | |
3624 | } | |
3625 | ||
71af2f6b | 3626 | static int __init test_f5(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3627 | { |
3628 | const u8 w[32] = { | |
3629 | 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86, | |
3630 | 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99, | |
3631 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3632 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3633 | const u8 n1[16] = { | |
3634 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3635 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3636 | const u8 n2[16] = { | |
3637 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3638 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3639 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3640 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3641 | const u8 exp_ltk[16] = { | |
3642 | 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98, | |
3643 | 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 }; | |
3644 | const u8 exp_mackey[16] = { | |
3645 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3646 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3647 | u8 mackey[16], ltk[16]; | |
3648 | int err; | |
3649 | ||
3650 | err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk); | |
3651 | if (err) | |
3652 | return err; | |
3653 | ||
329d8230 | 3654 | if (crypto_memneq(mackey, exp_mackey, 16)) |
fb2969a3 JH |
3655 | return -EINVAL; |
3656 | ||
329d8230 | 3657 | if (crypto_memneq(ltk, exp_ltk, 16)) |
fb2969a3 JH |
3658 | return -EINVAL; |
3659 | ||
3660 | return 0; | |
3661 | } | |
3662 | ||
71af2f6b | 3663 | static int __init test_f6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3664 | { |
3665 | const u8 w[16] = { | |
3666 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3667 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3668 | const u8 n1[16] = { | |
3669 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3670 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3671 | const u8 n2[16] = { | |
3672 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3673 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3674 | const u8 r[16] = { | |
3675 | 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08, | |
3676 | 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 }; | |
3677 | const u8 io_cap[3] = { 0x02, 0x01, 0x01 }; | |
3678 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3679 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3680 | const u8 exp[16] = { | |
3681 | 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2, | |
3682 | 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 }; | |
3683 | u8 res[16]; | |
3684 | int err; | |
3685 | ||
3686 | err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res); | |
3687 | if (err) | |
3688 | return err; | |
3689 | ||
329d8230 | 3690 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3691 | return -EINVAL; |
3692 | ||
3693 | return 0; | |
3694 | } | |
3695 | ||
71af2f6b | 3696 | static int __init test_g2(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3697 | { |
3698 | const u8 u[32] = { | |
3699 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3700 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3701 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3702 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3703 | const u8 v[32] = { | |
3704 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3705 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3706 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3707 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3708 | const u8 x[16] = { | |
3709 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3710 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3711 | const u8 y[16] = { | |
3712 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3713 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3714 | const u32 exp_val = 0x2f9ed5ba % 1000000; | |
3715 | u32 val; | |
3716 | int err; | |
3717 | ||
3718 | err = smp_g2(tfm_cmac, u, v, x, y, &val); | |
3719 | if (err) | |
3720 | return err; | |
3721 | ||
3722 | if (val != exp_val) | |
3723 | return -EINVAL; | |
3724 | ||
3725 | return 0; | |
3726 | } | |
3727 | ||
71af2f6b | 3728 | static int __init test_h6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3729 | { |
3730 | const u8 w[16] = { | |
3731 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3732 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3733 | const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
3734 | const u8 exp[16] = { | |
3735 | 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8, | |
3736 | 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d }; | |
3737 | u8 res[16]; | |
3738 | int err; | |
3739 | ||
3740 | err = smp_h6(tfm_cmac, w, key_id, res); | |
3741 | if (err) | |
3742 | return err; | |
3743 | ||
329d8230 | 3744 | if (crypto_memneq(res, exp, 16)) |
fb2969a3 JH |
3745 | return -EINVAL; |
3746 | ||
3747 | return 0; | |
3748 | } | |
3749 | ||
64dd374e MH |
3750 | static char test_smp_buffer[32]; |
3751 | ||
3752 | static ssize_t test_smp_read(struct file *file, char __user *user_buf, | |
3753 | size_t count, loff_t *ppos) | |
3754 | { | |
3755 | return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer, | |
3756 | strlen(test_smp_buffer)); | |
3757 | } | |
3758 | ||
3759 | static const struct file_operations test_smp_fops = { | |
3760 | .open = simple_open, | |
3761 | .read = test_smp_read, | |
3762 | .llseek = default_llseek, | |
3763 | }; | |
3764 | ||
a4770e11 | 3765 | static int __init run_selftests(struct crypto_cipher *tfm_aes, |
71af2f6b | 3766 | struct crypto_shash *tfm_cmac) |
0a2b0f04 | 3767 | { |
255047b0 MH |
3768 | ktime_t calltime, delta, rettime; |
3769 | unsigned long long duration; | |
cfc4198e JH |
3770 | int err; |
3771 | ||
255047b0 MH |
3772 | calltime = ktime_get(); |
3773 | ||
71653eb6 MH |
3774 | err = test_debug_key(); |
3775 | if (err) { | |
3776 | BT_ERR("debug_key test failed"); | |
3777 | goto done; | |
3778 | } | |
3779 | ||
cfc4198e JH |
3780 | err = test_ah(tfm_aes); |
3781 | if (err) { | |
3782 | BT_ERR("smp_ah test failed"); | |
64dd374e | 3783 | goto done; |
cfc4198e JH |
3784 | } |
3785 | ||
3786 | err = test_c1(tfm_aes); | |
3787 | if (err) { | |
3788 | BT_ERR("smp_c1 test failed"); | |
64dd374e | 3789 | goto done; |
cfc4198e JH |
3790 | } |
3791 | ||
3792 | err = test_s1(tfm_aes); | |
3793 | if (err) { | |
3794 | BT_ERR("smp_s1 test failed"); | |
64dd374e | 3795 | goto done; |
cfc4198e JH |
3796 | } |
3797 | ||
fb2969a3 JH |
3798 | err = test_f4(tfm_cmac); |
3799 | if (err) { | |
3800 | BT_ERR("smp_f4 test failed"); | |
64dd374e | 3801 | goto done; |
fb2969a3 JH |
3802 | } |
3803 | ||
3804 | err = test_f5(tfm_cmac); | |
3805 | if (err) { | |
3806 | BT_ERR("smp_f5 test failed"); | |
64dd374e | 3807 | goto done; |
fb2969a3 JH |
3808 | } |
3809 | ||
3810 | err = test_f6(tfm_cmac); | |
3811 | if (err) { | |
3812 | BT_ERR("smp_f6 test failed"); | |
64dd374e | 3813 | goto done; |
fb2969a3 JH |
3814 | } |
3815 | ||
3816 | err = test_g2(tfm_cmac); | |
3817 | if (err) { | |
3818 | BT_ERR("smp_g2 test failed"); | |
64dd374e | 3819 | goto done; |
fb2969a3 JH |
3820 | } |
3821 | ||
3822 | err = test_h6(tfm_cmac); | |
3823 | if (err) { | |
3824 | BT_ERR("smp_h6 test failed"); | |
64dd374e | 3825 | goto done; |
fb2969a3 JH |
3826 | } |
3827 | ||
255047b0 MH |
3828 | rettime = ktime_get(); |
3829 | delta = ktime_sub(rettime, calltime); | |
3830 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
3831 | ||
5ced2464 | 3832 | BT_INFO("SMP test passed in %llu usecs", duration); |
0a2b0f04 | 3833 | |
64dd374e MH |
3834 | done: |
3835 | if (!err) | |
3836 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), | |
3837 | "PASS (%llu usecs)\n", duration); | |
3838 | else | |
3839 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n"); | |
3840 | ||
3841 | debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL, | |
3842 | &test_smp_fops); | |
3843 | ||
3844 | return err; | |
0a2b0f04 JH |
3845 | } |
3846 | ||
3847 | int __init bt_selftest_smp(void) | |
3848 | { | |
a4770e11 | 3849 | struct crypto_cipher *tfm_aes; |
71af2f6b | 3850 | struct crypto_shash *tfm_cmac; |
0a2b0f04 JH |
3851 | int err; |
3852 | ||
a4770e11 | 3853 | tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 | 3854 | if (IS_ERR(tfm_aes)) { |
a4770e11 | 3855 | BT_ERR("Unable to create AES crypto context"); |
0a2b0f04 JH |
3856 | return PTR_ERR(tfm_aes); |
3857 | } | |
3858 | ||
71af2f6b | 3859 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 JH |
3860 | if (IS_ERR(tfm_cmac)) { |
3861 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 3862 | crypto_free_cipher(tfm_aes); |
0a2b0f04 JH |
3863 | return PTR_ERR(tfm_cmac); |
3864 | } | |
3865 | ||
3866 | err = run_selftests(tfm_aes, tfm_cmac); | |
3867 | ||
71af2f6b | 3868 | crypto_free_shash(tfm_cmac); |
a4770e11 | 3869 | crypto_free_cipher(tfm_aes); |
0a2b0f04 JH |
3870 | |
3871 | return err; | |
3872 | } | |
3873 | ||
3874 | #endif |