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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 | ||
8c520a59 GP |
23 | #include <linux/crypto.h> |
24 | #include <linux/scatterlist.h> | |
25 | #include <crypto/b128ops.h> | |
26 | ||
eb492e01 AB |
27 | #include <net/bluetooth/bluetooth.h> |
28 | #include <net/bluetooth/hci_core.h> | |
29 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 30 | #include <net/bluetooth/mgmt.h> |
ac4b7236 | 31 | |
3b19146d | 32 | #include "ecc.h" |
ac4b7236 | 33 | #include "smp.h" |
d22ef0bc | 34 | |
c7a3d57d JH |
35 | /* Low-level debug macros to be used for stuff that we don't want |
36 | * accidentially in dmesg, i.e. the values of the various crypto keys | |
37 | * and the inputs & outputs of crypto functions. | |
38 | */ | |
39 | #ifdef DEBUG | |
40 | #define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
41 | ##__VA_ARGS__) | |
42 | #else | |
43 | #define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
44 | ##__VA_ARGS__) | |
45 | #endif | |
46 | ||
b28b4943 | 47 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 48 | |
3b19146d JH |
49 | /* Keys which are not distributed with Secure Connections */ |
50 | #define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY); | |
51 | ||
17b02e62 | 52 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 53 | |
0edb14de JH |
54 | #define AUTH_REQ_MASK(dev) (test_bit(HCI_SC_ENABLED, &(dev)->dev_flags) ? \ |
55 | 0x1f : 0x07) | |
56 | #define KEY_DIST_MASK 0x07 | |
065a13e2 | 57 | |
cbbbe3e2 JH |
58 | /* Maximum message length that can be passed to aes_cmac */ |
59 | #define CMAC_MSG_MAX 80 | |
60 | ||
533e35d4 JH |
61 | enum { |
62 | SMP_FLAG_TK_VALID, | |
63 | SMP_FLAG_CFM_PENDING, | |
64 | SMP_FLAG_MITM_AUTH, | |
65 | SMP_FLAG_COMPLETE, | |
66 | SMP_FLAG_INITIATOR, | |
65668776 | 67 | SMP_FLAG_SC, |
d8f8edbe | 68 | SMP_FLAG_REMOTE_PK, |
aeb7d461 | 69 | SMP_FLAG_DEBUG_KEY, |
38606f14 | 70 | SMP_FLAG_WAIT_USER, |
d3e54a87 | 71 | SMP_FLAG_DHKEY_PENDING, |
02b05bd8 | 72 | SMP_FLAG_OOB, |
533e35d4 | 73 | }; |
4bc58f51 JH |
74 | |
75 | struct smp_chan { | |
b68fda68 JH |
76 | struct l2cap_conn *conn; |
77 | struct delayed_work security_timer; | |
b28b4943 | 78 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 79 | |
4bc58f51 JH |
80 | u8 preq[7]; /* SMP Pairing Request */ |
81 | u8 prsp[7]; /* SMP Pairing Response */ | |
82 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
83 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
84 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
85 | u8 tk[16]; /* SMP Temporary Key */ | |
a29b0733 | 86 | u8 rr[16]; |
4bc58f51 JH |
87 | u8 enc_key_size; |
88 | u8 remote_key_dist; | |
89 | bdaddr_t id_addr; | |
90 | u8 id_addr_type; | |
91 | u8 irk[16]; | |
92 | struct smp_csrk *csrk; | |
93 | struct smp_csrk *slave_csrk; | |
94 | struct smp_ltk *ltk; | |
95 | struct smp_ltk *slave_ltk; | |
96 | struct smp_irk *remote_irk; | |
6a77083a | 97 | u8 *link_key; |
4a74d658 | 98 | unsigned long flags; |
783e0574 | 99 | u8 method; |
38606f14 | 100 | u8 passkey_round; |
6a7bd103 | 101 | |
3b19146d JH |
102 | /* Secure Connections variables */ |
103 | u8 local_pk[64]; | |
104 | u8 local_sk[32]; | |
d8f8edbe JH |
105 | u8 remote_pk[64]; |
106 | u8 dhkey[32]; | |
760b018b | 107 | u8 mackey[16]; |
3b19146d | 108 | |
6a7bd103 | 109 | struct crypto_blkcipher *tfm_aes; |
407cecf6 | 110 | struct crypto_hash *tfm_cmac; |
4bc58f51 JH |
111 | }; |
112 | ||
aeb7d461 JH |
113 | /* These debug key values are defined in the SMP section of the core |
114 | * specification. debug_pk is the public debug key and debug_sk the | |
115 | * private debug key. | |
116 | */ | |
117 | static const u8 debug_pk[64] = { | |
118 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
119 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
120 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
121 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20, | |
122 | ||
123 | 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74, | |
124 | 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76, | |
125 | 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63, | |
126 | 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc, | |
127 | }; | |
128 | ||
129 | static const u8 debug_sk[32] = { | |
130 | 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58, | |
131 | 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a, | |
132 | 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74, | |
133 | 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f, | |
134 | }; | |
135 | ||
8a2936f4 | 136 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 137 | { |
8a2936f4 | 138 | size_t i; |
d22ef0bc | 139 | |
8a2936f4 JH |
140 | for (i = 0; i < len; i++) |
141 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
142 | } |
143 | ||
06edf8de JH |
144 | /* The following functions map to the LE SC SMP crypto functions |
145 | * AES-CMAC, f4, f5, f6, g2 and h6. | |
146 | */ | |
147 | ||
cbbbe3e2 JH |
148 | static int aes_cmac(struct crypto_hash *tfm, const u8 k[16], const u8 *m, |
149 | size_t len, u8 mac[16]) | |
150 | { | |
151 | uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX]; | |
152 | struct hash_desc desc; | |
153 | struct scatterlist sg; | |
154 | int err; | |
155 | ||
156 | if (len > CMAC_MSG_MAX) | |
157 | return -EFBIG; | |
158 | ||
159 | if (!tfm) { | |
160 | BT_ERR("tfm %p", tfm); | |
161 | return -EINVAL; | |
162 | } | |
163 | ||
164 | desc.tfm = tfm; | |
165 | desc.flags = 0; | |
166 | ||
167 | crypto_hash_init(&desc); | |
168 | ||
169 | /* Swap key and message from LSB to MSB */ | |
170 | swap_buf(k, tmp, 16); | |
171 | swap_buf(m, msg_msb, len); | |
172 | ||
c7a3d57d JH |
173 | SMP_DBG("msg (len %zu) %*phN", len, (int) len, m); |
174 | SMP_DBG("key %16phN", k); | |
cbbbe3e2 JH |
175 | |
176 | err = crypto_hash_setkey(tfm, tmp, 16); | |
177 | if (err) { | |
178 | BT_ERR("cipher setkey failed: %d", err); | |
179 | return err; | |
180 | } | |
181 | ||
182 | sg_init_one(&sg, msg_msb, len); | |
183 | ||
184 | err = crypto_hash_update(&desc, &sg, len); | |
185 | if (err) { | |
186 | BT_ERR("Hash update error %d", err); | |
187 | return err; | |
188 | } | |
189 | ||
190 | err = crypto_hash_final(&desc, mac_msb); | |
191 | if (err) { | |
192 | BT_ERR("Hash final error %d", err); | |
193 | return err; | |
194 | } | |
195 | ||
196 | swap_buf(mac_msb, mac, 16); | |
197 | ||
c7a3d57d | 198 | SMP_DBG("mac %16phN", mac); |
cbbbe3e2 JH |
199 | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static int smp_f4(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32], | |
204 | const u8 x[16], u8 z, u8 res[16]) | |
205 | { | |
206 | u8 m[65]; | |
207 | int err; | |
208 | ||
c7a3d57d JH |
209 | SMP_DBG("u %32phN", u); |
210 | SMP_DBG("v %32phN", v); | |
211 | SMP_DBG("x %16phN z %02x", x, z); | |
cbbbe3e2 JH |
212 | |
213 | m[0] = z; | |
214 | memcpy(m + 1, v, 32); | |
215 | memcpy(m + 33, u, 32); | |
216 | ||
217 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), res); | |
218 | if (err) | |
219 | return err; | |
220 | ||
c7a3d57d | 221 | SMP_DBG("res %16phN", res); |
cbbbe3e2 JH |
222 | |
223 | return err; | |
224 | } | |
225 | ||
4da50de8 JH |
226 | static int smp_f5(struct crypto_hash *tfm_cmac, const u8 w[32], |
227 | const u8 n1[16], const u8 n2[16], const u8 a1[7], | |
228 | const u8 a2[7], u8 mackey[16], u8 ltk[16]) | |
760b018b JH |
229 | { |
230 | /* The btle, salt and length "magic" values are as defined in | |
231 | * the SMP section of the Bluetooth core specification. In ASCII | |
232 | * the btle value ends up being 'btle'. The salt is just a | |
233 | * random number whereas length is the value 256 in little | |
234 | * endian format. | |
235 | */ | |
236 | const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 }; | |
237 | const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60, | |
238 | 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c }; | |
239 | const u8 length[2] = { 0x00, 0x01 }; | |
240 | u8 m[53], t[16]; | |
241 | int err; | |
242 | ||
c7a3d57d JH |
243 | SMP_DBG("w %32phN", w); |
244 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
245 | SMP_DBG("a1 %7phN a2 %7phN", a1, a2); | |
760b018b JH |
246 | |
247 | err = aes_cmac(tfm_cmac, salt, w, 32, t); | |
248 | if (err) | |
249 | return err; | |
250 | ||
c7a3d57d | 251 | SMP_DBG("t %16phN", t); |
760b018b JH |
252 | |
253 | memcpy(m, length, 2); | |
254 | memcpy(m + 2, a2, 7); | |
255 | memcpy(m + 9, a1, 7); | |
256 | memcpy(m + 16, n2, 16); | |
257 | memcpy(m + 32, n1, 16); | |
258 | memcpy(m + 48, btle, 4); | |
259 | ||
260 | m[52] = 0; /* Counter */ | |
261 | ||
262 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey); | |
263 | if (err) | |
264 | return err; | |
265 | ||
c7a3d57d | 266 | SMP_DBG("mackey %16phN", mackey); |
760b018b JH |
267 | |
268 | m[52] = 1; /* Counter */ | |
269 | ||
270 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk); | |
271 | if (err) | |
272 | return err; | |
273 | ||
c7a3d57d | 274 | SMP_DBG("ltk %16phN", ltk); |
760b018b JH |
275 | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static int smp_f6(struct crypto_hash *tfm_cmac, const u8 w[16], | |
4da50de8 | 280 | const u8 n1[16], const u8 n2[16], const u8 r[16], |
760b018b JH |
281 | const u8 io_cap[3], const u8 a1[7], const u8 a2[7], |
282 | u8 res[16]) | |
283 | { | |
284 | u8 m[65]; | |
285 | int err; | |
286 | ||
c7a3d57d JH |
287 | SMP_DBG("w %16phN", w); |
288 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
289 | SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2); | |
760b018b JH |
290 | |
291 | memcpy(m, a2, 7); | |
292 | memcpy(m + 7, a1, 7); | |
293 | memcpy(m + 14, io_cap, 3); | |
294 | memcpy(m + 17, r, 16); | |
295 | memcpy(m + 33, n2, 16); | |
296 | memcpy(m + 49, n1, 16); | |
297 | ||
298 | err = aes_cmac(tfm_cmac, w, m, sizeof(m), res); | |
299 | if (err) | |
300 | return err; | |
301 | ||
302 | BT_DBG("res %16phN", res); | |
303 | ||
304 | return err; | |
305 | } | |
306 | ||
191dc7fe JH |
307 | static int smp_g2(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32], |
308 | const u8 x[16], const u8 y[16], u32 *val) | |
309 | { | |
310 | u8 m[80], tmp[16]; | |
311 | int err; | |
312 | ||
c7a3d57d JH |
313 | SMP_DBG("u %32phN", u); |
314 | SMP_DBG("v %32phN", v); | |
315 | SMP_DBG("x %16phN y %16phN", x, y); | |
191dc7fe JH |
316 | |
317 | memcpy(m, y, 16); | |
318 | memcpy(m + 16, v, 32); | |
319 | memcpy(m + 48, u, 32); | |
320 | ||
321 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp); | |
322 | if (err) | |
323 | return err; | |
324 | ||
325 | *val = get_unaligned_le32(tmp); | |
326 | *val %= 1000000; | |
327 | ||
c7a3d57d | 328 | SMP_DBG("val %06u", *val); |
191dc7fe JH |
329 | |
330 | return 0; | |
331 | } | |
332 | ||
06edf8de JH |
333 | static int smp_h6(struct crypto_hash *tfm_cmac, const u8 w[16], |
334 | const u8 key_id[4], u8 res[16]) | |
335 | { | |
336 | int err; | |
337 | ||
338 | SMP_DBG("w %16phN key_id %4phN", w, key_id); | |
339 | ||
340 | err = aes_cmac(tfm_cmac, w, key_id, 4, res); | |
341 | if (err) | |
342 | return err; | |
343 | ||
344 | SMP_DBG("res %16phN", res); | |
345 | ||
346 | return err; | |
347 | } | |
348 | ||
349 | /* The following functions map to the legacy SMP crypto functions e, c1, | |
350 | * s1 and ah. | |
351 | */ | |
352 | ||
d22ef0bc AB |
353 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) |
354 | { | |
355 | struct blkcipher_desc desc; | |
356 | struct scatterlist sg; | |
943a732a | 357 | uint8_t tmp[16], data[16]; |
201a5929 | 358 | int err; |
d22ef0bc | 359 | |
7f376cd6 | 360 | if (!tfm) { |
d22ef0bc AB |
361 | BT_ERR("tfm %p", tfm); |
362 | return -EINVAL; | |
363 | } | |
364 | ||
365 | desc.tfm = tfm; | |
366 | desc.flags = 0; | |
367 | ||
943a732a | 368 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 369 | swap_buf(k, tmp, 16); |
943a732a JH |
370 | |
371 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
372 | if (err) { |
373 | BT_ERR("cipher setkey failed: %d", err); | |
374 | return err; | |
375 | } | |
376 | ||
943a732a | 377 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 378 | swap_buf(r, data, 16); |
943a732a JH |
379 | |
380 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 381 | |
d22ef0bc AB |
382 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
383 | if (err) | |
384 | BT_ERR("Encrypt data error %d", err); | |
385 | ||
943a732a | 386 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 387 | swap_buf(data, r, 16); |
943a732a | 388 | |
d22ef0bc AB |
389 | return err; |
390 | } | |
391 | ||
06edf8de JH |
392 | static int smp_c1(struct crypto_blkcipher *tfm_aes, const u8 k[16], |
393 | const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat, | |
394 | const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16]) | |
6a77083a | 395 | { |
06edf8de | 396 | u8 p1[16], p2[16]; |
6a77083a JH |
397 | int err; |
398 | ||
06edf8de | 399 | memset(p1, 0, 16); |
6a77083a | 400 | |
06edf8de JH |
401 | /* p1 = pres || preq || _rat || _iat */ |
402 | p1[0] = _iat; | |
403 | p1[1] = _rat; | |
404 | memcpy(p1 + 2, preq, 7); | |
405 | memcpy(p1 + 9, pres, 7); | |
406 | ||
407 | /* p2 = padding || ia || ra */ | |
408 | memcpy(p2, ra, 6); | |
409 | memcpy(p2 + 6, ia, 6); | |
410 | memset(p2 + 12, 0, 4); | |
411 | ||
412 | /* res = r XOR p1 */ | |
413 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
414 | ||
415 | /* res = e(k, res) */ | |
416 | err = smp_e(tfm_aes, k, res); | |
417 | if (err) { | |
418 | BT_ERR("Encrypt data error"); | |
6a77083a | 419 | return err; |
06edf8de | 420 | } |
6a77083a | 421 | |
06edf8de JH |
422 | /* res = res XOR p2 */ |
423 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
424 | ||
425 | /* res = e(k, res) */ | |
426 | err = smp_e(tfm_aes, k, res); | |
427 | if (err) | |
428 | BT_ERR("Encrypt data error"); | |
429 | ||
430 | return err; | |
431 | } | |
432 | ||
433 | static int smp_s1(struct crypto_blkcipher *tfm_aes, const u8 k[16], | |
434 | const u8 r1[16], const u8 r2[16], u8 _r[16]) | |
435 | { | |
436 | int err; | |
437 | ||
438 | /* Just least significant octets from r1 and r2 are considered */ | |
439 | memcpy(_r, r2, 8); | |
440 | memcpy(_r + 8, r1, 8); | |
441 | ||
442 | err = smp_e(tfm_aes, k, _r); | |
443 | if (err) | |
444 | BT_ERR("Encrypt data error"); | |
6a77083a JH |
445 | |
446 | return err; | |
447 | } | |
448 | ||
cd082797 JH |
449 | static int smp_ah(struct crypto_blkcipher *tfm, const u8 irk[16], |
450 | const u8 r[3], u8 res[3]) | |
60478054 | 451 | { |
943a732a | 452 | u8 _res[16]; |
60478054 JH |
453 | int err; |
454 | ||
455 | /* r' = padding || r */ | |
943a732a JH |
456 | memcpy(_res, r, 3); |
457 | memset(_res + 3, 0, 13); | |
60478054 | 458 | |
943a732a | 459 | err = smp_e(tfm, irk, _res); |
60478054 JH |
460 | if (err) { |
461 | BT_ERR("Encrypt error"); | |
462 | return err; | |
463 | } | |
464 | ||
465 | /* The output of the random address function ah is: | |
466 | * ah(h, r) = e(k, r') mod 2^24 | |
467 | * The output of the security function e is then truncated to 24 bits | |
468 | * by taking the least significant 24 bits of the output of e as the | |
469 | * result of ah. | |
470 | */ | |
943a732a | 471 | memcpy(res, _res, 3); |
60478054 JH |
472 | |
473 | return 0; | |
474 | } | |
475 | ||
cd082797 JH |
476 | bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], |
477 | const bdaddr_t *bdaddr) | |
60478054 | 478 | { |
defce9e8 JH |
479 | struct l2cap_chan *chan = hdev->smp_data; |
480 | struct crypto_blkcipher *tfm; | |
60478054 JH |
481 | u8 hash[3]; |
482 | int err; | |
483 | ||
defce9e8 JH |
484 | if (!chan || !chan->data) |
485 | return false; | |
486 | ||
487 | tfm = chan->data; | |
488 | ||
60478054 JH |
489 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
490 | ||
491 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
492 | if (err) | |
493 | return false; | |
494 | ||
495 | return !memcmp(bdaddr->b, hash, 3); | |
496 | } | |
497 | ||
cd082797 | 498 | int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 499 | { |
defce9e8 JH |
500 | struct l2cap_chan *chan = hdev->smp_data; |
501 | struct crypto_blkcipher *tfm; | |
b1e2b3ae JH |
502 | int err; |
503 | ||
defce9e8 JH |
504 | if (!chan || !chan->data) |
505 | return -EOPNOTSUPP; | |
506 | ||
507 | tfm = chan->data; | |
508 | ||
b1e2b3ae JH |
509 | get_random_bytes(&rpa->b[3], 3); |
510 | ||
511 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
512 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
513 | ||
514 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
515 | if (err < 0) | |
516 | return err; | |
517 | ||
518 | BT_DBG("RPA %pMR", rpa); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
5d88cc73 | 523 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 524 | { |
5d88cc73 | 525 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 526 | struct smp_chan *smp; |
5d88cc73 JH |
527 | struct kvec iv[2]; |
528 | struct msghdr msg; | |
eb492e01 | 529 | |
5d88cc73 JH |
530 | if (!chan) |
531 | return; | |
eb492e01 | 532 | |
5d88cc73 | 533 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 534 | |
5d88cc73 JH |
535 | iv[0].iov_base = &code; |
536 | iv[0].iov_len = 1; | |
eb492e01 | 537 | |
5d88cc73 JH |
538 | iv[1].iov_base = data; |
539 | iv[1].iov_len = len; | |
eb492e01 | 540 | |
5d88cc73 | 541 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 542 | |
17836394 | 543 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len); |
eb492e01 | 544 | |
5d88cc73 | 545 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 546 | |
b68fda68 JH |
547 | if (!chan->data) |
548 | return; | |
549 | ||
550 | smp = chan->data; | |
551 | ||
552 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 553 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
554 | } |
555 | ||
d2eb9e10 | 556 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 557 | { |
d2eb9e10 JH |
558 | if (authreq & SMP_AUTH_MITM) { |
559 | if (authreq & SMP_AUTH_SC) | |
560 | return BT_SECURITY_FIPS; | |
561 | else | |
562 | return BT_SECURITY_HIGH; | |
563 | } else { | |
2b64d153 | 564 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 565 | } |
2b64d153 BG |
566 | } |
567 | ||
568 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
569 | { | |
570 | switch (sec_level) { | |
d2eb9e10 | 571 | case BT_SECURITY_FIPS: |
2b64d153 BG |
572 | case BT_SECURITY_HIGH: |
573 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
574 | case BT_SECURITY_MEDIUM: | |
575 | return SMP_AUTH_BONDING; | |
576 | default: | |
577 | return SMP_AUTH_NONE; | |
578 | } | |
579 | } | |
580 | ||
b8e66eac | 581 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
582 | struct smp_cmd_pairing *req, |
583 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 584 | { |
5d88cc73 JH |
585 | struct l2cap_chan *chan = conn->smp; |
586 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
587 | struct hci_conn *hcon = conn->hcon; |
588 | struct hci_dev *hdev = hcon->hdev; | |
02b05bd8 | 589 | u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT; |
54790f73 | 590 | |
b6ae8457 | 591 | if (test_bit(HCI_BONDABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
592 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
593 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 594 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
595 | } else { |
596 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
597 | } |
598 | ||
fd349c02 JH |
599 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
600 | remote_dist |= SMP_DIST_ID_KEY; | |
601 | ||
863efaf2 JH |
602 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
603 | local_dist |= SMP_DIST_ID_KEY; | |
604 | ||
02b05bd8 JH |
605 | if (test_bit(HCI_SC_ENABLED, &hdev->dev_flags) && |
606 | (authreq & SMP_AUTH_SC)) { | |
607 | struct oob_data *oob_data; | |
608 | u8 bdaddr_type; | |
609 | ||
610 | if (test_bit(HCI_SSP_ENABLED, &hdev->dev_flags)) { | |
df8e1a4c JH |
611 | local_dist |= SMP_DIST_LINK_KEY; |
612 | remote_dist |= SMP_DIST_LINK_KEY; | |
613 | } | |
02b05bd8 JH |
614 | |
615 | if (hcon->dst_type == ADDR_LE_DEV_PUBLIC) | |
616 | bdaddr_type = BDADDR_LE_PUBLIC; | |
617 | else | |
618 | bdaddr_type = BDADDR_LE_RANDOM; | |
619 | ||
620 | oob_data = hci_find_remote_oob_data(hdev, &hcon->dst, | |
621 | bdaddr_type); | |
622 | if (oob_data) { | |
623 | set_bit(SMP_FLAG_OOB, &smp->flags); | |
624 | oob_flag = SMP_OOB_PRESENT; | |
a29b0733 | 625 | memcpy(smp->rr, oob_data->rand256, 16); |
02b05bd8 JH |
626 | memcpy(smp->pcnf, oob_data->hash256, 16); |
627 | } | |
628 | ||
df8e1a4c JH |
629 | } else { |
630 | authreq &= ~SMP_AUTH_SC; | |
631 | } | |
632 | ||
54790f73 VCG |
633 | if (rsp == NULL) { |
634 | req->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 635 | req->oob_flag = oob_flag; |
54790f73 | 636 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
fd349c02 JH |
637 | req->init_key_dist = local_dist; |
638 | req->resp_key_dist = remote_dist; | |
0edb14de | 639 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
640 | |
641 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
642 | return; |
643 | } | |
644 | ||
645 | rsp->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 646 | rsp->oob_flag = oob_flag; |
54790f73 | 647 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
fd349c02 JH |
648 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
649 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 650 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
651 | |
652 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
653 | } |
654 | ||
3158c50c VCG |
655 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
656 | { | |
5d88cc73 JH |
657 | struct l2cap_chan *chan = conn->smp; |
658 | struct smp_chan *smp = chan->data; | |
1c1def09 | 659 | |
3158c50c | 660 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 661 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
662 | return SMP_ENC_KEY_SIZE; |
663 | ||
f7aa611a | 664 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
665 | |
666 | return 0; | |
667 | } | |
668 | ||
6f48e260 JH |
669 | static void smp_chan_destroy(struct l2cap_conn *conn) |
670 | { | |
671 | struct l2cap_chan *chan = conn->smp; | |
672 | struct smp_chan *smp = chan->data; | |
923e2414 | 673 | struct hci_conn *hcon = conn->hcon; |
6f48e260 JH |
674 | bool complete; |
675 | ||
676 | BUG_ON(!smp); | |
677 | ||
678 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 679 | |
6f48e260 | 680 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
923e2414 | 681 | mgmt_smp_complete(hcon, complete); |
6f48e260 JH |
682 | |
683 | kfree(smp->csrk); | |
684 | kfree(smp->slave_csrk); | |
6a77083a | 685 | kfree(smp->link_key); |
6f48e260 JH |
686 | |
687 | crypto_free_blkcipher(smp->tfm_aes); | |
407cecf6 | 688 | crypto_free_hash(smp->tfm_cmac); |
6f48e260 | 689 | |
923e2414 JH |
690 | /* Ensure that we don't leave any debug key around if debug key |
691 | * support hasn't been explicitly enabled. | |
692 | */ | |
693 | if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG && | |
694 | !test_bit(HCI_KEEP_DEBUG_KEYS, &hcon->hdev->dev_flags)) { | |
695 | list_del_rcu(&smp->ltk->list); | |
696 | kfree_rcu(smp->ltk, rcu); | |
697 | smp->ltk = NULL; | |
698 | } | |
699 | ||
6f48e260 JH |
700 | /* If pairing failed clean up any keys we might have */ |
701 | if (!complete) { | |
702 | if (smp->ltk) { | |
970d0f1b JH |
703 | list_del_rcu(&smp->ltk->list); |
704 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
705 | } |
706 | ||
707 | if (smp->slave_ltk) { | |
970d0f1b JH |
708 | list_del_rcu(&smp->slave_ltk->list); |
709 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
710 | } |
711 | ||
712 | if (smp->remote_irk) { | |
adae20cb JH |
713 | list_del_rcu(&smp->remote_irk->list); |
714 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
715 | } |
716 | } | |
717 | ||
718 | chan->data = NULL; | |
719 | kfree(smp); | |
923e2414 | 720 | hci_conn_drop(hcon); |
6f48e260 JH |
721 | } |
722 | ||
84794e11 | 723 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 724 | { |
bab73cb6 | 725 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 726 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 727 | |
84794e11 | 728 | if (reason) |
4f957a76 | 729 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 730 | &reason); |
4f957a76 | 731 | |
ce39fb4e | 732 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
e1e930f5 | 733 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 734 | |
fc75cc86 | 735 | if (chan->data) |
f1c09c07 | 736 | smp_chan_destroy(conn); |
4f957a76 BG |
737 | } |
738 | ||
2b64d153 BG |
739 | #define JUST_WORKS 0x00 |
740 | #define JUST_CFM 0x01 | |
741 | #define REQ_PASSKEY 0x02 | |
742 | #define CFM_PASSKEY 0x03 | |
743 | #define REQ_OOB 0x04 | |
5e3d3d9b | 744 | #define DSP_PASSKEY 0x05 |
2b64d153 BG |
745 | #define OVERLAP 0xFF |
746 | ||
747 | static const u8 gen_method[5][5] = { | |
748 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
749 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
750 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
751 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
752 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
753 | }; | |
754 | ||
5e3d3d9b JH |
755 | static const u8 sc_method[5][5] = { |
756 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
757 | { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
758 | { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY }, | |
759 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
760 | { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
761 | }; | |
762 | ||
581370cc JH |
763 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
764 | { | |
2bcd4003 JH |
765 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
766 | * converted later to JUST_WORKS if we're initiators. | |
767 | */ | |
581370cc JH |
768 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
769 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 770 | return JUST_CFM; |
581370cc | 771 | |
5e3d3d9b JH |
772 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
773 | return sc_method[remote_io][local_io]; | |
774 | ||
581370cc JH |
775 | return gen_method[remote_io][local_io]; |
776 | } | |
777 | ||
2b64d153 BG |
778 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
779 | u8 local_io, u8 remote_io) | |
780 | { | |
781 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
782 | struct l2cap_chan *chan = conn->smp; |
783 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
784 | u32 passkey = 0; |
785 | int ret = 0; | |
786 | ||
787 | /* Initialize key for JUST WORKS */ | |
788 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 789 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
790 | |
791 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
792 | ||
2bcd4003 JH |
793 | /* If neither side wants MITM, either "just" confirm an incoming |
794 | * request or use just-works for outgoing ones. The JUST_CFM | |
795 | * will be converted to JUST_WORKS if necessary later in this | |
796 | * function. If either side has MITM look up the method from the | |
797 | * table. | |
798 | */ | |
581370cc | 799 | if (!(auth & SMP_AUTH_MITM)) |
783e0574 | 800 | smp->method = JUST_CFM; |
2b64d153 | 801 | else |
783e0574 | 802 | smp->method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 803 | |
a82505c7 | 804 | /* Don't confirm locally initiated pairing attempts */ |
783e0574 JH |
805 | if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, |
806 | &smp->flags)) | |
807 | smp->method = JUST_WORKS; | |
a82505c7 | 808 | |
02f3e254 | 809 | /* Don't bother user space with no IO capabilities */ |
783e0574 JH |
810 | if (smp->method == JUST_CFM && |
811 | hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
812 | smp->method = JUST_WORKS; | |
02f3e254 | 813 | |
2b64d153 | 814 | /* If Just Works, Continue with Zero TK */ |
783e0574 | 815 | if (smp->method == JUST_WORKS) { |
4a74d658 | 816 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
817 | return 0; |
818 | } | |
819 | ||
820 | /* Not Just Works/Confirm results in MITM Authentication */ | |
783e0574 | 821 | if (smp->method != JUST_CFM) { |
4a74d658 | 822 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
823 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
824 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
825 | } | |
2b64d153 BG |
826 | |
827 | /* If both devices have Keyoard-Display I/O, the master | |
828 | * Confirms and the slave Enters the passkey. | |
829 | */ | |
783e0574 | 830 | if (smp->method == OVERLAP) { |
40bef302 | 831 | if (hcon->role == HCI_ROLE_MASTER) |
783e0574 | 832 | smp->method = CFM_PASSKEY; |
2b64d153 | 833 | else |
783e0574 | 834 | smp->method = REQ_PASSKEY; |
2b64d153 BG |
835 | } |
836 | ||
01ad34d2 | 837 | /* Generate random passkey. */ |
783e0574 | 838 | if (smp->method == CFM_PASSKEY) { |
943a732a | 839 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
840 | get_random_bytes(&passkey, sizeof(passkey)); |
841 | passkey %= 1000000; | |
943a732a | 842 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 843 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 844 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
845 | } |
846 | ||
783e0574 | 847 | if (smp->method == REQ_PASSKEY) |
ce39fb4e | 848 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 849 | hcon->type, hcon->dst_type); |
783e0574 | 850 | else if (smp->method == JUST_CFM) |
4eb65e66 JH |
851 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
852 | hcon->type, hcon->dst_type, | |
853 | passkey, 1); | |
2b64d153 | 854 | else |
01ad34d2 | 855 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 856 | hcon->type, hcon->dst_type, |
39adbffe | 857 | passkey, 0); |
2b64d153 | 858 | |
2b64d153 BG |
859 | return ret; |
860 | } | |
861 | ||
1cc61144 | 862 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 863 | { |
8aab4757 | 864 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
865 | struct smp_cmd_pairing_confirm cp; |
866 | int ret; | |
8aab4757 VCG |
867 | |
868 | BT_DBG("conn %p", conn); | |
869 | ||
e491eaf3 | 870 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 871 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
872 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
873 | cp.confirm_val); | |
1cc61144 JH |
874 | if (ret) |
875 | return SMP_UNSPECIFIED; | |
8aab4757 | 876 | |
4a74d658 | 877 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 878 | |
8aab4757 VCG |
879 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
880 | ||
b28b4943 JH |
881 | if (conn->hcon->out) |
882 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
883 | else | |
884 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
885 | ||
1cc61144 | 886 | return 0; |
8aab4757 VCG |
887 | } |
888 | ||
861580a9 | 889 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 890 | { |
8aab4757 VCG |
891 | struct l2cap_conn *conn = smp->conn; |
892 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 893 | u8 confirm[16]; |
8aab4757 VCG |
894 | int ret; |
895 | ||
ec70f36f | 896 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 897 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
898 | |
899 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
900 | ||
e491eaf3 | 901 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 902 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 903 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
904 | if (ret) |
905 | return SMP_UNSPECIFIED; | |
8aab4757 | 906 | |
8aab4757 VCG |
907 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
908 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 909 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
910 | } |
911 | ||
912 | if (hcon->out) { | |
fe39c7b2 MH |
913 | u8 stk[16]; |
914 | __le64 rand = 0; | |
915 | __le16 ediv = 0; | |
8aab4757 | 916 | |
e491eaf3 | 917 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 918 | |
f7aa611a | 919 | memset(stk + smp->enc_key_size, 0, |
04124681 | 920 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 921 | |
861580a9 JH |
922 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
923 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
924 | |
925 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 926 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 927 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 928 | } else { |
fff3490f | 929 | u8 stk[16], auth; |
fe39c7b2 MH |
930 | __le64 rand = 0; |
931 | __le16 ediv = 0; | |
8aab4757 | 932 | |
943a732a JH |
933 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
934 | smp->prnd); | |
8aab4757 | 935 | |
e491eaf3 | 936 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 937 | |
f7aa611a | 938 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 939 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 940 | |
fff3490f JH |
941 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
942 | auth = 1; | |
943 | else | |
944 | auth = 0; | |
945 | ||
7d5843b7 JH |
946 | /* Even though there's no _SLAVE suffix this is the |
947 | * slave STK we're adding for later lookup (the master | |
948 | * STK never needs to be stored). | |
949 | */ | |
ce39fb4e | 950 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 951 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
952 | } |
953 | ||
861580a9 | 954 | return 0; |
8aab4757 VCG |
955 | } |
956 | ||
44f1a7ab JH |
957 | static void smp_notify_keys(struct l2cap_conn *conn) |
958 | { | |
959 | struct l2cap_chan *chan = conn->smp; | |
960 | struct smp_chan *smp = chan->data; | |
961 | struct hci_conn *hcon = conn->hcon; | |
962 | struct hci_dev *hdev = hcon->hdev; | |
963 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
964 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
965 | bool persistent; | |
966 | ||
967 | if (smp->remote_irk) { | |
968 | mgmt_new_irk(hdev, smp->remote_irk); | |
969 | /* Now that user space can be considered to know the | |
970 | * identity address track the connection based on it | |
b5ae344d | 971 | * from now on (assuming this is an LE link). |
44f1a7ab | 972 | */ |
b5ae344d JH |
973 | if (hcon->type == LE_LINK) { |
974 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
975 | hcon->dst_type = smp->remote_irk->addr_type; | |
976 | queue_work(hdev->workqueue, &conn->id_addr_update_work); | |
977 | } | |
44f1a7ab JH |
978 | |
979 | /* When receiving an indentity resolving key for | |
980 | * a remote device that does not use a resolvable | |
981 | * private address, just remove the key so that | |
982 | * it is possible to use the controller white | |
983 | * list for scanning. | |
984 | * | |
985 | * Userspace will have been told to not store | |
986 | * this key at this point. So it is safe to | |
987 | * just remove it. | |
988 | */ | |
989 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
adae20cb JH |
990 | list_del_rcu(&smp->remote_irk->list); |
991 | kfree_rcu(smp->remote_irk, rcu); | |
44f1a7ab JH |
992 | smp->remote_irk = NULL; |
993 | } | |
994 | } | |
995 | ||
b5ae344d JH |
996 | if (hcon->type == ACL_LINK) { |
997 | if (hcon->key_type == HCI_LK_DEBUG_COMBINATION) | |
998 | persistent = false; | |
999 | else | |
1000 | persistent = !test_bit(HCI_CONN_FLUSH_KEY, | |
1001 | &hcon->flags); | |
1002 | } else { | |
1003 | /* The LTKs and CSRKs should be persistent only if both sides | |
1004 | * had the bonding bit set in their authentication requests. | |
1005 | */ | |
1006 | persistent = !!((req->auth_req & rsp->auth_req) & | |
1007 | SMP_AUTH_BONDING); | |
1008 | } | |
1009 | ||
44f1a7ab JH |
1010 | |
1011 | if (smp->csrk) { | |
1012 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1013 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
1014 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
1015 | } | |
1016 | ||
1017 | if (smp->slave_csrk) { | |
1018 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1019 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
1020 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
1021 | } | |
1022 | ||
1023 | if (smp->ltk) { | |
1024 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1025 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
1026 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
1027 | } | |
1028 | ||
1029 | if (smp->slave_ltk) { | |
1030 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1031 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
1032 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
1033 | } | |
6a77083a JH |
1034 | |
1035 | if (smp->link_key) { | |
e3befab9 JH |
1036 | struct link_key *key; |
1037 | u8 type; | |
1038 | ||
1039 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1040 | type = HCI_LK_DEBUG_COMBINATION; | |
1041 | else if (hcon->sec_level == BT_SECURITY_FIPS) | |
1042 | type = HCI_LK_AUTH_COMBINATION_P256; | |
1043 | else | |
1044 | type = HCI_LK_UNAUTH_COMBINATION_P256; | |
1045 | ||
1046 | key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst, | |
1047 | smp->link_key, type, 0, &persistent); | |
1048 | if (key) { | |
1049 | mgmt_new_link_key(hdev, key, persistent); | |
1050 | ||
1051 | /* Don't keep debug keys around if the relevant | |
1052 | * flag is not set. | |
1053 | */ | |
1054 | if (!test_bit(HCI_KEEP_DEBUG_KEYS, &hdev->dev_flags) && | |
1055 | key->type == HCI_LK_DEBUG_COMBINATION) { | |
1056 | list_del_rcu(&key->list); | |
1057 | kfree_rcu(key, rcu); | |
1058 | } | |
1059 | } | |
6a77083a JH |
1060 | } |
1061 | } | |
1062 | ||
d3e54a87 JH |
1063 | static void sc_add_ltk(struct smp_chan *smp) |
1064 | { | |
1065 | struct hci_conn *hcon = smp->conn->hcon; | |
1066 | u8 key_type, auth; | |
1067 | ||
1068 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1069 | key_type = SMP_LTK_P256_DEBUG; | |
1070 | else | |
1071 | key_type = SMP_LTK_P256; | |
1072 | ||
1073 | if (hcon->pending_sec_level == BT_SECURITY_FIPS) | |
1074 | auth = 1; | |
1075 | else | |
1076 | auth = 0; | |
1077 | ||
1078 | memset(smp->tk + smp->enc_key_size, 0, | |
1079 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); | |
1080 | ||
1081 | smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, | |
1082 | key_type, auth, smp->tk, smp->enc_key_size, | |
1083 | 0, 0); | |
1084 | } | |
1085 | ||
6a77083a JH |
1086 | static void sc_generate_link_key(struct smp_chan *smp) |
1087 | { | |
1088 | /* These constants are as specified in the core specification. | |
1089 | * In ASCII they spell out to 'tmp1' and 'lebr'. | |
1090 | */ | |
1091 | const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1092 | const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
1093 | ||
1094 | smp->link_key = kzalloc(16, GFP_KERNEL); | |
1095 | if (!smp->link_key) | |
1096 | return; | |
1097 | ||
1098 | if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) { | |
1099 | kfree(smp->link_key); | |
1100 | smp->link_key = NULL; | |
1101 | return; | |
1102 | } | |
1103 | ||
1104 | if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) { | |
1105 | kfree(smp->link_key); | |
1106 | smp->link_key = NULL; | |
1107 | return; | |
1108 | } | |
44f1a7ab JH |
1109 | } |
1110 | ||
b28b4943 JH |
1111 | static void smp_allow_key_dist(struct smp_chan *smp) |
1112 | { | |
1113 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
1114 | * will be allowed in each PDU handler to ensure we receive | |
1115 | * them in the correct order. | |
1116 | */ | |
1117 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
1118 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
1119 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
1120 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
1121 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
1122 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1123 | } | |
1124 | ||
b5ae344d JH |
1125 | static void sc_generate_ltk(struct smp_chan *smp) |
1126 | { | |
1127 | /* These constants are as specified in the core specification. | |
1128 | * In ASCII they spell out to 'tmp2' and 'brle'. | |
1129 | */ | |
1130 | const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1131 | const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 }; | |
1132 | struct hci_conn *hcon = smp->conn->hcon; | |
1133 | struct hci_dev *hdev = hcon->hdev; | |
1134 | struct link_key *key; | |
1135 | ||
1136 | key = hci_find_link_key(hdev, &hcon->dst); | |
1137 | if (!key) { | |
1138 | BT_ERR("%s No Link Key found to generate LTK", hdev->name); | |
1139 | return; | |
1140 | } | |
1141 | ||
1142 | if (key->type == HCI_LK_DEBUG_COMBINATION) | |
1143 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1144 | ||
1145 | if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk)) | |
1146 | return; | |
1147 | ||
1148 | if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk)) | |
1149 | return; | |
1150 | ||
1151 | sc_add_ltk(smp); | |
1152 | } | |
1153 | ||
d6268e86 | 1154 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
1155 | { |
1156 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 1157 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
1158 | struct hci_conn *hcon = conn->hcon; |
1159 | struct hci_dev *hdev = hcon->hdev; | |
1160 | __u8 *keydist; | |
1161 | ||
1162 | BT_DBG("conn %p", conn); | |
1163 | ||
44f1a7ab JH |
1164 | rsp = (void *) &smp->prsp[1]; |
1165 | ||
1166 | /* The responder sends its keys first */ | |
b28b4943 JH |
1167 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
1168 | smp_allow_key_dist(smp); | |
86d1407c | 1169 | return; |
b28b4943 | 1170 | } |
44f1a7ab JH |
1171 | |
1172 | req = (void *) &smp->preq[1]; | |
1173 | ||
1174 | if (hcon->out) { | |
1175 | keydist = &rsp->init_key_dist; | |
1176 | *keydist &= req->init_key_dist; | |
1177 | } else { | |
1178 | keydist = &rsp->resp_key_dist; | |
1179 | *keydist &= req->resp_key_dist; | |
1180 | } | |
1181 | ||
6a77083a | 1182 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
b5ae344d | 1183 | if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY)) |
6a77083a | 1184 | sc_generate_link_key(smp); |
b5ae344d JH |
1185 | if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY)) |
1186 | sc_generate_ltk(smp); | |
6a77083a JH |
1187 | |
1188 | /* Clear the keys which are generated but not distributed */ | |
1189 | *keydist &= ~SMP_SC_NO_DIST; | |
1190 | } | |
1191 | ||
44f1a7ab JH |
1192 | BT_DBG("keydist 0x%x", *keydist); |
1193 | ||
1194 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1195 | struct smp_cmd_encrypt_info enc; | |
1196 | struct smp_cmd_master_ident ident; | |
1197 | struct smp_ltk *ltk; | |
1198 | u8 authenticated; | |
1199 | __le16 ediv; | |
1200 | __le64 rand; | |
1201 | ||
1202 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
1203 | get_random_bytes(&ediv, sizeof(ediv)); | |
1204 | get_random_bytes(&rand, sizeof(rand)); | |
1205 | ||
1206 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1207 | ||
1208 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
1209 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
1210 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
1211 | smp->enc_key_size, ediv, rand); | |
1212 | smp->slave_ltk = ltk; | |
1213 | ||
1214 | ident.ediv = ediv; | |
1215 | ident.rand = rand; | |
1216 | ||
1217 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1218 | ||
1219 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1220 | } | |
1221 | ||
1222 | if (*keydist & SMP_DIST_ID_KEY) { | |
1223 | struct smp_cmd_ident_addr_info addrinfo; | |
1224 | struct smp_cmd_ident_info idinfo; | |
1225 | ||
1226 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
1227 | ||
1228 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1229 | ||
1230 | /* The hci_conn contains the local identity address | |
1231 | * after the connection has been established. | |
1232 | * | |
1233 | * This is true even when the connection has been | |
1234 | * established using a resolvable random address. | |
1235 | */ | |
1236 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
1237 | addrinfo.addr_type = hcon->src_type; | |
1238 | ||
1239 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1240 | &addrinfo); | |
1241 | ||
1242 | *keydist &= ~SMP_DIST_ID_KEY; | |
1243 | } | |
1244 | ||
1245 | if (*keydist & SMP_DIST_SIGN) { | |
1246 | struct smp_cmd_sign_info sign; | |
1247 | struct smp_csrk *csrk; | |
1248 | ||
1249 | /* Generate a new random key */ | |
1250 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1251 | ||
1252 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1253 | if (csrk) { | |
1254 | csrk->master = 0x00; | |
1255 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
1256 | } | |
1257 | smp->slave_csrk = csrk; | |
1258 | ||
1259 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1260 | ||
1261 | *keydist &= ~SMP_DIST_SIGN; | |
1262 | } | |
1263 | ||
1264 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
1265 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
1266 | smp_allow_key_dist(smp); | |
86d1407c | 1267 | return; |
b28b4943 | 1268 | } |
44f1a7ab | 1269 | |
44f1a7ab JH |
1270 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1271 | smp_notify_keys(conn); | |
1272 | ||
1273 | smp_chan_destroy(conn); | |
44f1a7ab JH |
1274 | } |
1275 | ||
b68fda68 JH |
1276 | static void smp_timeout(struct work_struct *work) |
1277 | { | |
1278 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
1279 | security_timer.work); | |
1280 | struct l2cap_conn *conn = smp->conn; | |
1281 | ||
1282 | BT_DBG("conn %p", conn); | |
1283 | ||
1e91c29e | 1284 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
1285 | } |
1286 | ||
8aab4757 VCG |
1287 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
1288 | { | |
5d88cc73 | 1289 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
1290 | struct smp_chan *smp; |
1291 | ||
f1560463 | 1292 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 1293 | if (!smp) |
8aab4757 VCG |
1294 | return NULL; |
1295 | ||
6a7bd103 JH |
1296 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
1297 | if (IS_ERR(smp->tfm_aes)) { | |
1298 | BT_ERR("Unable to create ECB crypto context"); | |
1299 | kfree(smp); | |
1300 | return NULL; | |
1301 | } | |
1302 | ||
407cecf6 JH |
1303 | smp->tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
1304 | if (IS_ERR(smp->tfm_cmac)) { | |
1305 | BT_ERR("Unable to create CMAC crypto context"); | |
1306 | crypto_free_blkcipher(smp->tfm_aes); | |
1307 | kfree(smp); | |
1308 | return NULL; | |
1309 | } | |
1310 | ||
8aab4757 | 1311 | smp->conn = conn; |
5d88cc73 | 1312 | chan->data = smp; |
8aab4757 | 1313 | |
b28b4943 JH |
1314 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
1315 | ||
b68fda68 JH |
1316 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
1317 | ||
8aab4757 VCG |
1318 | hci_conn_hold(conn->hcon); |
1319 | ||
1320 | return smp; | |
1321 | } | |
1322 | ||
760b018b JH |
1323 | static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16]) |
1324 | { | |
1325 | struct hci_conn *hcon = smp->conn->hcon; | |
1326 | u8 *na, *nb, a[7], b[7]; | |
1327 | ||
1328 | if (hcon->out) { | |
1329 | na = smp->prnd; | |
1330 | nb = smp->rrnd; | |
1331 | } else { | |
1332 | na = smp->rrnd; | |
1333 | nb = smp->prnd; | |
1334 | } | |
1335 | ||
1336 | memcpy(a, &hcon->init_addr, 6); | |
1337 | memcpy(b, &hcon->resp_addr, 6); | |
1338 | a[6] = hcon->init_addr_type; | |
1339 | b[6] = hcon->resp_addr_type; | |
1340 | ||
1341 | return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk); | |
1342 | } | |
1343 | ||
38606f14 | 1344 | static void sc_dhkey_check(struct smp_chan *smp) |
760b018b JH |
1345 | { |
1346 | struct hci_conn *hcon = smp->conn->hcon; | |
1347 | struct smp_cmd_dhkey_check check; | |
1348 | u8 a[7], b[7], *local_addr, *remote_addr; | |
1349 | u8 io_cap[3], r[16]; | |
1350 | ||
760b018b JH |
1351 | memcpy(a, &hcon->init_addr, 6); |
1352 | memcpy(b, &hcon->resp_addr, 6); | |
1353 | a[6] = hcon->init_addr_type; | |
1354 | b[6] = hcon->resp_addr_type; | |
1355 | ||
1356 | if (hcon->out) { | |
1357 | local_addr = a; | |
1358 | remote_addr = b; | |
1359 | memcpy(io_cap, &smp->preq[1], 3); | |
1360 | } else { | |
1361 | local_addr = b; | |
1362 | remote_addr = a; | |
1363 | memcpy(io_cap, &smp->prsp[1], 3); | |
1364 | } | |
1365 | ||
dddd3059 JH |
1366 | memset(r, 0, sizeof(r)); |
1367 | ||
1368 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
38606f14 | 1369 | put_unaligned_le32(hcon->passkey_notify, r); |
760b018b | 1370 | |
a29b0733 JH |
1371 | if (smp->method == REQ_OOB) |
1372 | memcpy(r, smp->rr, 16); | |
1373 | ||
760b018b JH |
1374 | smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap, |
1375 | local_addr, remote_addr, check.e); | |
1376 | ||
1377 | smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check); | |
dddd3059 JH |
1378 | } |
1379 | ||
38606f14 JH |
1380 | static u8 sc_passkey_send_confirm(struct smp_chan *smp) |
1381 | { | |
1382 | struct l2cap_conn *conn = smp->conn; | |
1383 | struct hci_conn *hcon = conn->hcon; | |
1384 | struct smp_cmd_pairing_confirm cfm; | |
1385 | u8 r; | |
1386 | ||
1387 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1388 | r |= 0x80; | |
1389 | ||
1390 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); | |
1391 | ||
1392 | if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r, | |
1393 | cfm.confirm_val)) | |
1394 | return SMP_UNSPECIFIED; | |
1395 | ||
1396 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
1397 | ||
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op) | |
1402 | { | |
1403 | struct l2cap_conn *conn = smp->conn; | |
1404 | struct hci_conn *hcon = conn->hcon; | |
1405 | struct hci_dev *hdev = hcon->hdev; | |
1406 | u8 cfm[16], r; | |
1407 | ||
1408 | /* Ignore the PDU if we've already done 20 rounds (0 - 19) */ | |
1409 | if (smp->passkey_round >= 20) | |
1410 | return 0; | |
1411 | ||
1412 | switch (smp_op) { | |
1413 | case SMP_CMD_PAIRING_RANDOM: | |
1414 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1415 | r |= 0x80; | |
1416 | ||
1417 | if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1418 | smp->rrnd, r, cfm)) | |
1419 | return SMP_UNSPECIFIED; | |
1420 | ||
1421 | if (memcmp(smp->pcnf, cfm, 16)) | |
1422 | return SMP_CONFIRM_FAILED; | |
1423 | ||
1424 | smp->passkey_round++; | |
1425 | ||
1426 | if (smp->passkey_round == 20) { | |
1427 | /* Generate MacKey and LTK */ | |
1428 | if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk)) | |
1429 | return SMP_UNSPECIFIED; | |
1430 | } | |
1431 | ||
1432 | /* The round is only complete when the initiator | |
1433 | * receives pairing random. | |
1434 | */ | |
1435 | if (!hcon->out) { | |
1436 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1437 | sizeof(smp->prnd), smp->prnd); | |
d3e54a87 | 1438 | if (smp->passkey_round == 20) |
38606f14 | 1439 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
d3e54a87 | 1440 | else |
38606f14 | 1441 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
38606f14 JH |
1442 | return 0; |
1443 | } | |
1444 | ||
1445 | /* Start the next round */ | |
1446 | if (smp->passkey_round != 20) | |
1447 | return sc_passkey_round(smp, 0); | |
1448 | ||
1449 | /* Passkey rounds are complete - start DHKey Check */ | |
1450 | sc_dhkey_check(smp); | |
1451 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1452 | ||
1453 | break; | |
1454 | ||
1455 | case SMP_CMD_PAIRING_CONFIRM: | |
1456 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
1457 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1462 | ||
1463 | if (hcon->out) { | |
1464 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1465 | sizeof(smp->prnd), smp->prnd); | |
1466 | return 0; | |
1467 | } | |
1468 | ||
1469 | return sc_passkey_send_confirm(smp); | |
1470 | ||
1471 | case SMP_CMD_PUBLIC_KEY: | |
1472 | default: | |
1473 | /* Initiating device starts the round */ | |
1474 | if (!hcon->out) | |
1475 | return 0; | |
1476 | ||
1477 | BT_DBG("%s Starting passkey round %u", hdev->name, | |
1478 | smp->passkey_round + 1); | |
1479 | ||
1480 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1481 | ||
1482 | return sc_passkey_send_confirm(smp); | |
1483 | } | |
1484 | ||
1485 | return 0; | |
1486 | } | |
1487 | ||
dddd3059 JH |
1488 | static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey) |
1489 | { | |
38606f14 JH |
1490 | struct l2cap_conn *conn = smp->conn; |
1491 | struct hci_conn *hcon = conn->hcon; | |
1492 | u8 smp_op; | |
1493 | ||
1494 | clear_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
1495 | ||
dddd3059 JH |
1496 | switch (mgmt_op) { |
1497 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1498 | smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED); | |
1499 | return 0; | |
1500 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
1501 | smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED); | |
1502 | return 0; | |
38606f14 JH |
1503 | case MGMT_OP_USER_PASSKEY_REPLY: |
1504 | hcon->passkey_notify = le32_to_cpu(passkey); | |
1505 | smp->passkey_round = 0; | |
1506 | ||
1507 | if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) | |
1508 | smp_op = SMP_CMD_PAIRING_CONFIRM; | |
1509 | else | |
1510 | smp_op = 0; | |
1511 | ||
1512 | if (sc_passkey_round(smp, smp_op)) | |
1513 | return -EIO; | |
1514 | ||
1515 | return 0; | |
dddd3059 JH |
1516 | } |
1517 | ||
d3e54a87 JH |
1518 | /* Initiator sends DHKey check first */ |
1519 | if (hcon->out) { | |
1520 | sc_dhkey_check(smp); | |
1521 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1522 | } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) { | |
1523 | sc_dhkey_check(smp); | |
1524 | sc_add_ltk(smp); | |
1525 | } | |
760b018b JH |
1526 | |
1527 | return 0; | |
1528 | } | |
1529 | ||
2b64d153 BG |
1530 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
1531 | { | |
b10e8017 | 1532 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 1533 | struct l2cap_chan *chan; |
2b64d153 BG |
1534 | struct smp_chan *smp; |
1535 | u32 value; | |
fc75cc86 | 1536 | int err; |
2b64d153 BG |
1537 | |
1538 | BT_DBG(""); | |
1539 | ||
fc75cc86 | 1540 | if (!conn) |
2b64d153 BG |
1541 | return -ENOTCONN; |
1542 | ||
5d88cc73 JH |
1543 | chan = conn->smp; |
1544 | if (!chan) | |
1545 | return -ENOTCONN; | |
1546 | ||
fc75cc86 JH |
1547 | l2cap_chan_lock(chan); |
1548 | if (!chan->data) { | |
1549 | err = -ENOTCONN; | |
1550 | goto unlock; | |
1551 | } | |
1552 | ||
5d88cc73 | 1553 | smp = chan->data; |
2b64d153 | 1554 | |
760b018b JH |
1555 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1556 | err = sc_user_reply(smp, mgmt_op, passkey); | |
1557 | goto unlock; | |
1558 | } | |
1559 | ||
2b64d153 BG |
1560 | switch (mgmt_op) { |
1561 | case MGMT_OP_USER_PASSKEY_REPLY: | |
1562 | value = le32_to_cpu(passkey); | |
943a732a | 1563 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 1564 | BT_DBG("PassKey: %d", value); |
943a732a | 1565 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
1566 | /* Fall Through */ |
1567 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 1568 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
1569 | break; |
1570 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1571 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 1572 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1573 | err = 0; |
1574 | goto unlock; | |
2b64d153 | 1575 | default: |
84794e11 | 1576 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1577 | err = -EOPNOTSUPP; |
1578 | goto unlock; | |
2b64d153 BG |
1579 | } |
1580 | ||
fc75cc86 JH |
1581 | err = 0; |
1582 | ||
2b64d153 | 1583 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
1584 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
1585 | u8 rsp = smp_confirm(smp); | |
1586 | if (rsp) | |
1587 | smp_failure(conn, rsp); | |
1588 | } | |
2b64d153 | 1589 | |
fc75cc86 JH |
1590 | unlock: |
1591 | l2cap_chan_unlock(chan); | |
1592 | return err; | |
2b64d153 BG |
1593 | } |
1594 | ||
b5ae344d JH |
1595 | static void build_bredr_pairing_cmd(struct smp_chan *smp, |
1596 | struct smp_cmd_pairing *req, | |
1597 | struct smp_cmd_pairing *rsp) | |
1598 | { | |
1599 | struct l2cap_conn *conn = smp->conn; | |
1600 | struct hci_dev *hdev = conn->hcon->hdev; | |
1601 | u8 local_dist = 0, remote_dist = 0; | |
1602 | ||
1603 | if (test_bit(HCI_BONDABLE, &hdev->dev_flags)) { | |
1604 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1605 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1606 | } | |
1607 | ||
1608 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) | |
1609 | remote_dist |= SMP_DIST_ID_KEY; | |
1610 | ||
1611 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) | |
1612 | local_dist |= SMP_DIST_ID_KEY; | |
1613 | ||
1614 | if (!rsp) { | |
1615 | memset(req, 0, sizeof(*req)); | |
1616 | ||
1617 | req->init_key_dist = local_dist; | |
1618 | req->resp_key_dist = remote_dist; | |
1619 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
1620 | ||
1621 | smp->remote_key_dist = remote_dist; | |
1622 | ||
1623 | return; | |
1624 | } | |
1625 | ||
1626 | memset(rsp, 0, sizeof(*rsp)); | |
1627 | ||
1628 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
1629 | rsp->init_key_dist = req->init_key_dist & remote_dist; | |
1630 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
1631 | ||
1632 | smp->remote_key_dist = rsp->init_key_dist; | |
1633 | } | |
1634 | ||
da85e5e5 | 1635 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1636 | { |
3158c50c | 1637 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 1638 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 1639 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 1640 | struct smp_chan *smp; |
c7262e71 | 1641 | u8 key_size, auth, sec_level; |
8aab4757 | 1642 | int ret; |
88ba43b6 AB |
1643 | |
1644 | BT_DBG("conn %p", conn); | |
1645 | ||
c46b98be | 1646 | if (skb->len < sizeof(*req)) |
38e4a915 | 1647 | return SMP_INVALID_PARAMS; |
c46b98be | 1648 | |
40bef302 | 1649 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
1650 | return SMP_CMD_NOTSUPP; |
1651 | ||
fc75cc86 | 1652 | if (!chan->data) |
8aab4757 | 1653 | smp = smp_chan_create(conn); |
fc75cc86 | 1654 | else |
5d88cc73 | 1655 | smp = chan->data; |
8aab4757 | 1656 | |
d08fd0e7 AE |
1657 | if (!smp) |
1658 | return SMP_UNSPECIFIED; | |
d26a2345 | 1659 | |
c05b9339 | 1660 | /* We didn't start the pairing, so match remote */ |
0edb14de | 1661 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1662 | |
b6ae8457 | 1663 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
c05b9339 | 1664 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
1665 | return SMP_PAIRING_NOTSUPP; |
1666 | ||
903b71c7 JH |
1667 | if (test_bit(HCI_SC_ONLY, &hdev->dev_flags) && !(auth & SMP_AUTH_SC)) |
1668 | return SMP_AUTH_REQUIREMENTS; | |
1669 | ||
1c1def09 VCG |
1670 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1671 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 1672 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 1673 | |
b5ae344d JH |
1674 | /* SMP over BR/EDR requires special treatment */ |
1675 | if (conn->hcon->type == ACL_LINK) { | |
1676 | /* We must have a BR/EDR SC link */ | |
08f63cc5 MH |
1677 | if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) && |
1678 | !test_bit(HCI_FORCE_LESC, &hdev->dbg_flags)) | |
b5ae344d JH |
1679 | return SMP_CROSS_TRANSP_NOT_ALLOWED; |
1680 | ||
1681 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1682 | ||
1683 | build_bredr_pairing_cmd(smp, req, &rsp); | |
1684 | ||
1685 | key_size = min(req->max_key_size, rsp.max_key_size); | |
1686 | if (check_enc_key_size(conn, key_size)) | |
1687 | return SMP_ENC_KEY_SIZE; | |
1688 | ||
1689 | /* Clear bits which are generated but not distributed */ | |
1690 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1691 | ||
1692 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; | |
1693 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
1694 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); | |
1695 | ||
1696 | smp_distribute_keys(smp); | |
1697 | return 0; | |
1698 | } | |
1699 | ||
5e3d3d9b JH |
1700 | build_pairing_cmd(conn, req, &rsp, auth); |
1701 | ||
1702 | if (rsp.auth_req & SMP_AUTH_SC) | |
1703 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1704 | ||
5be5e275 | 1705 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1706 | sec_level = BT_SECURITY_MEDIUM; |
1707 | else | |
1708 | sec_level = authreq_to_seclevel(auth); | |
1709 | ||
c7262e71 JH |
1710 | if (sec_level > conn->hcon->pending_sec_level) |
1711 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1712 | |
49c922bb | 1713 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1714 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1715 | u8 method; | |
1716 | ||
1717 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1718 | req->io_capability); | |
1719 | if (method == JUST_WORKS || method == JUST_CFM) | |
1720 | return SMP_AUTH_REQUIREMENTS; | |
1721 | } | |
1722 | ||
3158c50c VCG |
1723 | key_size = min(req->max_key_size, rsp.max_key_size); |
1724 | if (check_enc_key_size(conn, key_size)) | |
1725 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1726 | |
e84a6b13 | 1727 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1728 | |
1c1def09 VCG |
1729 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1730 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1731 | |
3158c50c | 1732 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1733 | |
1734 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1735 | ||
1736 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { | |
1737 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1738 | /* Clear bits which are generated but not distributed */ | |
1739 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1740 | /* Wait for Public Key from Initiating Device */ | |
1741 | return 0; | |
1742 | } else { | |
1743 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1744 | } | |
da85e5e5 | 1745 | |
2b64d153 BG |
1746 | /* Request setup of TK */ |
1747 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1748 | if (ret) | |
1749 | return SMP_UNSPECIFIED; | |
1750 | ||
da85e5e5 | 1751 | return 0; |
88ba43b6 AB |
1752 | } |
1753 | ||
3b19146d JH |
1754 | static u8 sc_send_public_key(struct smp_chan *smp) |
1755 | { | |
70157ef5 JH |
1756 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
1757 | ||
3b19146d JH |
1758 | BT_DBG(""); |
1759 | ||
70157ef5 JH |
1760 | if (test_bit(HCI_USE_DEBUG_KEYS, &hdev->dev_flags)) { |
1761 | BT_DBG("Using debug keys"); | |
1762 | memcpy(smp->local_pk, debug_pk, 64); | |
1763 | memcpy(smp->local_sk, debug_sk, 32); | |
1764 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1765 | } else { | |
1766 | while (true) { | |
1767 | /* Generate local key pair for Secure Connections */ | |
1768 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
1769 | return SMP_UNSPECIFIED; | |
6c0dcc50 | 1770 | |
70157ef5 JH |
1771 | /* This is unlikely, but we need to check that |
1772 | * we didn't accidentially generate a debug key. | |
1773 | */ | |
1774 | if (memcmp(smp->local_sk, debug_sk, 32)) | |
1775 | break; | |
1776 | } | |
6c0dcc50 | 1777 | } |
3b19146d | 1778 | |
c7a3d57d JH |
1779 | SMP_DBG("Local Public Key X: %32phN", smp->local_pk); |
1780 | SMP_DBG("Local Public Key Y: %32phN", &smp->local_pk[32]); | |
1781 | SMP_DBG("Local Private Key: %32phN", smp->local_sk); | |
3b19146d JH |
1782 | |
1783 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1784 | ||
1785 | return 0; | |
1786 | } | |
1787 | ||
da85e5e5 | 1788 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1789 | { |
3158c50c | 1790 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1791 | struct l2cap_chan *chan = conn->smp; |
1792 | struct smp_chan *smp = chan->data; | |
0edb14de | 1793 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1794 | u8 key_size, auth; |
7d24ddcc | 1795 | int ret; |
88ba43b6 AB |
1796 | |
1797 | BT_DBG("conn %p", conn); | |
1798 | ||
c46b98be | 1799 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1800 | return SMP_INVALID_PARAMS; |
c46b98be | 1801 | |
40bef302 | 1802 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1803 | return SMP_CMD_NOTSUPP; |
1804 | ||
3158c50c VCG |
1805 | skb_pull(skb, sizeof(*rsp)); |
1806 | ||
1c1def09 | 1807 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1808 | |
3158c50c VCG |
1809 | key_size = min(req->max_key_size, rsp->max_key_size); |
1810 | if (check_enc_key_size(conn, key_size)) | |
1811 | return SMP_ENC_KEY_SIZE; | |
1812 | ||
0edb14de | 1813 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1814 | |
903b71c7 JH |
1815 | if (test_bit(HCI_SC_ONLY, &hdev->dev_flags) && !(auth & SMP_AUTH_SC)) |
1816 | return SMP_AUTH_REQUIREMENTS; | |
1817 | ||
b5ae344d JH |
1818 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1819 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
1820 | ||
1821 | /* Update remote key distribution in case the remote cleared | |
1822 | * some bits that we had enabled in our request. | |
1823 | */ | |
1824 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1825 | ||
1826 | /* For BR/EDR this means we're done and can start phase 3 */ | |
1827 | if (conn->hcon->type == ACL_LINK) { | |
1828 | /* Clear bits which are generated but not distributed */ | |
1829 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1830 | smp_distribute_keys(smp); | |
1831 | return 0; | |
1832 | } | |
1833 | ||
65668776 JH |
1834 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1835 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1836 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1837 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1838 | |
49c922bb | 1839 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1840 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1841 | u8 method; | |
1842 | ||
1843 | method = get_auth_method(smp, req->io_capability, | |
1844 | rsp->io_capability); | |
1845 | if (method == JUST_WORKS || method == JUST_CFM) | |
1846 | return SMP_AUTH_REQUIREMENTS; | |
1847 | } | |
1848 | ||
e84a6b13 | 1849 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1850 | |
fdcc4bec JH |
1851 | /* Update remote key distribution in case the remote cleared |
1852 | * some bits that we had enabled in our request. | |
1853 | */ | |
1854 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1855 | ||
3b19146d JH |
1856 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1857 | /* Clear bits which are generated but not distributed */ | |
1858 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1859 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1860 | return sc_send_public_key(smp); | |
1861 | } | |
1862 | ||
c05b9339 | 1863 | auth |= req->auth_req; |
2b64d153 | 1864 | |
476585ec | 1865 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1866 | if (ret) |
1867 | return SMP_UNSPECIFIED; | |
1868 | ||
4a74d658 | 1869 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1870 | |
1871 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1872 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1873 | return smp_confirm(smp); |
da85e5e5 VCG |
1874 | |
1875 | return 0; | |
88ba43b6 AB |
1876 | } |
1877 | ||
dcee2b32 JH |
1878 | static u8 sc_check_confirm(struct smp_chan *smp) |
1879 | { | |
1880 | struct l2cap_conn *conn = smp->conn; | |
1881 | ||
1882 | BT_DBG(""); | |
1883 | ||
1884 | /* Public Key exchange must happen before any other steps */ | |
1885 | if (!test_bit(SMP_FLAG_REMOTE_PK, &smp->flags)) | |
1886 | return SMP_UNSPECIFIED; | |
1887 | ||
38606f14 JH |
1888 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
1889 | return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM); | |
1890 | ||
dcee2b32 JH |
1891 | if (conn->hcon->out) { |
1892 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1893 | smp->prnd); | |
1894 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1895 | } | |
1896 | ||
1897 | return 0; | |
1898 | } | |
1899 | ||
da85e5e5 | 1900 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1901 | { |
5d88cc73 JH |
1902 | struct l2cap_chan *chan = conn->smp; |
1903 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 1904 | |
88ba43b6 AB |
1905 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
1906 | ||
c46b98be | 1907 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 1908 | return SMP_INVALID_PARAMS; |
c46b98be | 1909 | |
1c1def09 VCG |
1910 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
1911 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 1912 | |
dcee2b32 JH |
1913 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
1914 | return sc_check_confirm(smp); | |
1915 | ||
b28b4943 | 1916 | if (conn->hcon->out) { |
943a732a JH |
1917 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1918 | smp->prnd); | |
b28b4943 JH |
1919 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 1924 | return smp_confirm(smp); |
943a732a | 1925 | else |
4a74d658 | 1926 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
1927 | |
1928 | return 0; | |
88ba43b6 AB |
1929 | } |
1930 | ||
da85e5e5 | 1931 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1932 | { |
5d88cc73 JH |
1933 | struct l2cap_chan *chan = conn->smp; |
1934 | struct smp_chan *smp = chan->data; | |
191dc7fe JH |
1935 | struct hci_conn *hcon = conn->hcon; |
1936 | u8 *pkax, *pkbx, *na, *nb; | |
1937 | u32 passkey; | |
1938 | int err; | |
7d24ddcc | 1939 | |
8aab4757 | 1940 | BT_DBG("conn %p", conn); |
3158c50c | 1941 | |
c46b98be | 1942 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 1943 | return SMP_INVALID_PARAMS; |
c46b98be | 1944 | |
943a732a | 1945 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 1946 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 1947 | |
191dc7fe JH |
1948 | if (!test_bit(SMP_FLAG_SC, &smp->flags)) |
1949 | return smp_random(smp); | |
1950 | ||
580039e8 JH |
1951 | if (hcon->out) { |
1952 | pkax = smp->local_pk; | |
1953 | pkbx = smp->remote_pk; | |
1954 | na = smp->prnd; | |
1955 | nb = smp->rrnd; | |
1956 | } else { | |
1957 | pkax = smp->remote_pk; | |
1958 | pkbx = smp->local_pk; | |
1959 | na = smp->rrnd; | |
1960 | nb = smp->prnd; | |
1961 | } | |
1962 | ||
a29b0733 JH |
1963 | if (smp->method == REQ_OOB) { |
1964 | if (!hcon->out) | |
1965 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1966 | sizeof(smp->prnd), smp->prnd); | |
1967 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1968 | goto mackey_and_ltk; | |
1969 | } | |
1970 | ||
38606f14 JH |
1971 | /* Passkey entry has special treatment */ |
1972 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
1973 | return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM); | |
1974 | ||
191dc7fe JH |
1975 | if (hcon->out) { |
1976 | u8 cfm[16]; | |
1977 | ||
1978 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1979 | smp->rrnd, 0, cfm); | |
1980 | if (err) | |
1981 | return SMP_UNSPECIFIED; | |
1982 | ||
1983 | if (memcmp(smp->pcnf, cfm, 16)) | |
1984 | return SMP_CONFIRM_FAILED; | |
191dc7fe JH |
1985 | } else { |
1986 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1987 | smp->prnd); | |
1988 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
191dc7fe JH |
1989 | } |
1990 | ||
a29b0733 | 1991 | mackey_and_ltk: |
760b018b JH |
1992 | /* Generate MacKey and LTK */ |
1993 | err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk); | |
1994 | if (err) | |
1995 | return SMP_UNSPECIFIED; | |
1996 | ||
a29b0733 | 1997 | if (smp->method == JUST_WORKS || smp->method == REQ_OOB) { |
dddd3059 | 1998 | if (hcon->out) { |
38606f14 | 1999 | sc_dhkey_check(smp); |
dddd3059 JH |
2000 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
2001 | } | |
2002 | return 0; | |
2003 | } | |
2004 | ||
38606f14 JH |
2005 | err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey); |
2006 | if (err) | |
2007 | return SMP_UNSPECIFIED; | |
2008 | ||
2009 | err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type, | |
2010 | hcon->dst_type, passkey, 0); | |
191dc7fe JH |
2011 | if (err) |
2012 | return SMP_UNSPECIFIED; | |
2013 | ||
38606f14 JH |
2014 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2015 | ||
191dc7fe | 2016 | return 0; |
88ba43b6 AB |
2017 | } |
2018 | ||
f81cd823 | 2019 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 2020 | { |
c9839a11 | 2021 | struct smp_ltk *key; |
988c5997 VCG |
2022 | struct hci_conn *hcon = conn->hcon; |
2023 | ||
f3a73d97 | 2024 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 2025 | if (!key) |
f81cd823 | 2026 | return false; |
988c5997 | 2027 | |
a6f7833c | 2028 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 2029 | return false; |
4dab7864 | 2030 | |
51a8efd7 | 2031 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 2032 | return true; |
988c5997 | 2033 | |
c9839a11 VCG |
2034 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
2035 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 2036 | |
fe59a05f JH |
2037 | /* We never store STKs for master role, so clear this flag */ |
2038 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
2039 | ||
f81cd823 | 2040 | return true; |
988c5997 | 2041 | } |
f1560463 | 2042 | |
35dc6f83 JH |
2043 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
2044 | enum smp_key_pref key_pref) | |
854f4727 JH |
2045 | { |
2046 | if (sec_level == BT_SECURITY_LOW) | |
2047 | return true; | |
2048 | ||
35dc6f83 JH |
2049 | /* If we're encrypted with an STK but the caller prefers using |
2050 | * LTK claim insufficient security. This way we allow the | |
2051 | * connection to be re-encrypted with an LTK, even if the LTK | |
2052 | * provides the same level of security. Only exception is if we | |
2053 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 2054 | */ |
35dc6f83 JH |
2055 | if (key_pref == SMP_USE_LTK && |
2056 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 2057 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
2058 | return false; |
2059 | ||
854f4727 JH |
2060 | if (hcon->sec_level >= sec_level) |
2061 | return true; | |
2062 | ||
2063 | return false; | |
2064 | } | |
2065 | ||
da85e5e5 | 2066 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
2067 | { |
2068 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
2069 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 2070 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 2071 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 2072 | struct smp_chan *smp; |
c05b9339 | 2073 | u8 sec_level, auth; |
88ba43b6 AB |
2074 | |
2075 | BT_DBG("conn %p", conn); | |
2076 | ||
c46b98be | 2077 | if (skb->len < sizeof(*rp)) |
38e4a915 | 2078 | return SMP_INVALID_PARAMS; |
c46b98be | 2079 | |
40bef302 | 2080 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
2081 | return SMP_CMD_NOTSUPP; |
2082 | ||
0edb14de | 2083 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 2084 | |
903b71c7 JH |
2085 | if (test_bit(HCI_SC_ONLY, &hdev->dev_flags) && !(auth & SMP_AUTH_SC)) |
2086 | return SMP_AUTH_REQUIREMENTS; | |
2087 | ||
5be5e275 | 2088 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
2089 | sec_level = BT_SECURITY_MEDIUM; |
2090 | else | |
2091 | sec_level = authreq_to_seclevel(auth); | |
2092 | ||
35dc6f83 | 2093 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
854f4727 JH |
2094 | return 0; |
2095 | ||
c7262e71 JH |
2096 | if (sec_level > hcon->pending_sec_level) |
2097 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 2098 | |
4dab7864 | 2099 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
2100 | return 0; |
2101 | ||
8aab4757 | 2102 | smp = smp_chan_create(conn); |
c29d2444 JH |
2103 | if (!smp) |
2104 | return SMP_UNSPECIFIED; | |
d26a2345 | 2105 | |
b6ae8457 | 2106 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
c05b9339 | 2107 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
2108 | return SMP_PAIRING_NOTSUPP; |
2109 | ||
88ba43b6 | 2110 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 2111 | |
da85e5e5 | 2112 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 2113 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 2114 | |
1c1def09 VCG |
2115 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2116 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2117 | |
88ba43b6 | 2118 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2119 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 2120 | |
da85e5e5 | 2121 | return 0; |
88ba43b6 AB |
2122 | } |
2123 | ||
cc110922 | 2124 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 2125 | { |
cc110922 | 2126 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 2127 | struct l2cap_chan *chan; |
0a66cf20 | 2128 | struct smp_chan *smp; |
2b64d153 | 2129 | __u8 authreq; |
fc75cc86 | 2130 | int ret; |
eb492e01 | 2131 | |
3a0259bb VCG |
2132 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
2133 | ||
0a66cf20 JH |
2134 | /* This may be NULL if there's an unexpected disconnection */ |
2135 | if (!conn) | |
2136 | return 1; | |
2137 | ||
c68b7f12 JH |
2138 | chan = conn->smp; |
2139 | ||
757aee0f | 2140 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
2141 | return 1; |
2142 | ||
35dc6f83 | 2143 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 2144 | return 1; |
f1cb9af5 | 2145 | |
c7262e71 JH |
2146 | if (sec_level > hcon->pending_sec_level) |
2147 | hcon->pending_sec_level = sec_level; | |
2148 | ||
40bef302 | 2149 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
2150 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
2151 | return 0; | |
d26a2345 | 2152 | |
fc75cc86 JH |
2153 | l2cap_chan_lock(chan); |
2154 | ||
2155 | /* If SMP is already in progress ignore this request */ | |
2156 | if (chan->data) { | |
2157 | ret = 0; | |
2158 | goto unlock; | |
2159 | } | |
d26a2345 | 2160 | |
8aab4757 | 2161 | smp = smp_chan_create(conn); |
fc75cc86 JH |
2162 | if (!smp) { |
2163 | ret = 1; | |
2164 | goto unlock; | |
2165 | } | |
2b64d153 BG |
2166 | |
2167 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 2168 | |
d2eb9e10 JH |
2169 | if (test_bit(HCI_SC_ENABLED, &hcon->hdev->dev_flags)) |
2170 | authreq |= SMP_AUTH_SC; | |
2171 | ||
79897d20 JH |
2172 | /* Require MITM if IO Capability allows or the security level |
2173 | * requires it. | |
2e233644 | 2174 | */ |
79897d20 | 2175 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 2176 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
2177 | authreq |= SMP_AUTH_MITM; |
2178 | ||
40bef302 | 2179 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 2180 | struct smp_cmd_pairing cp; |
f01ead31 | 2181 | |
2b64d153 | 2182 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
2183 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2184 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2185 | |
eb492e01 | 2186 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2187 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
2188 | } else { |
2189 | struct smp_cmd_security_req cp; | |
2b64d153 | 2190 | cp.auth_req = authreq; |
eb492e01 | 2191 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 2192 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
2193 | } |
2194 | ||
4a74d658 | 2195 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 2196 | ret = 0; |
edca792c | 2197 | |
fc75cc86 JH |
2198 | unlock: |
2199 | l2cap_chan_unlock(chan); | |
2200 | return ret; | |
eb492e01 AB |
2201 | } |
2202 | ||
7034b911 VCG |
2203 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2204 | { | |
16b90839 | 2205 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
2206 | struct l2cap_chan *chan = conn->smp; |
2207 | struct smp_chan *smp = chan->data; | |
16b90839 | 2208 | |
c46b98be JH |
2209 | BT_DBG("conn %p", conn); |
2210 | ||
2211 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2212 | return SMP_INVALID_PARAMS; |
c46b98be | 2213 | |
b28b4943 | 2214 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 2215 | |
16b90839 VCG |
2216 | skb_pull(skb, sizeof(*rp)); |
2217 | ||
1c1def09 | 2218 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 2219 | |
7034b911 VCG |
2220 | return 0; |
2221 | } | |
2222 | ||
2223 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
2224 | { | |
16b90839 | 2225 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
2226 | struct l2cap_chan *chan = conn->smp; |
2227 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
2228 | struct hci_dev *hdev = conn->hcon->hdev; |
2229 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 2230 | struct smp_ltk *ltk; |
c9839a11 | 2231 | u8 authenticated; |
16b90839 | 2232 | |
c46b98be JH |
2233 | BT_DBG("conn %p", conn); |
2234 | ||
2235 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2236 | return SMP_INVALID_PARAMS; |
c46b98be | 2237 | |
9747a9f3 JH |
2238 | /* Mark the information as received */ |
2239 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
2240 | ||
b28b4943 JH |
2241 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
2242 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
2243 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
2244 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 2245 | |
16b90839 | 2246 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 2247 | |
ce39fb4e | 2248 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 2249 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
2250 | authenticated, smp->tk, smp->enc_key_size, |
2251 | rp->ediv, rp->rand); | |
2252 | smp->ltk = ltk; | |
c6e81e9a | 2253 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 2254 | smp_distribute_keys(smp); |
7034b911 VCG |
2255 | |
2256 | return 0; | |
2257 | } | |
2258 | ||
fd349c02 JH |
2259 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2260 | { | |
2261 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
2262 | struct l2cap_chan *chan = conn->smp; |
2263 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2264 | |
2265 | BT_DBG(""); | |
2266 | ||
2267 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2268 | return SMP_INVALID_PARAMS; |
fd349c02 | 2269 | |
b28b4943 | 2270 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 2271 | |
fd349c02 JH |
2272 | skb_pull(skb, sizeof(*info)); |
2273 | ||
2274 | memcpy(smp->irk, info->irk, 16); | |
2275 | ||
2276 | return 0; | |
2277 | } | |
2278 | ||
2279 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
2280 | struct sk_buff *skb) | |
2281 | { | |
2282 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
2283 | struct l2cap_chan *chan = conn->smp; |
2284 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2285 | struct hci_conn *hcon = conn->hcon; |
2286 | bdaddr_t rpa; | |
2287 | ||
2288 | BT_DBG(""); | |
2289 | ||
2290 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2291 | return SMP_INVALID_PARAMS; |
fd349c02 | 2292 | |
9747a9f3 JH |
2293 | /* Mark the information as received */ |
2294 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
2295 | ||
b28b4943 JH |
2296 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
2297 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
2298 | ||
fd349c02 JH |
2299 | skb_pull(skb, sizeof(*info)); |
2300 | ||
a9a58f86 JH |
2301 | /* Strictly speaking the Core Specification (4.1) allows sending |
2302 | * an empty address which would force us to rely on just the IRK | |
2303 | * as "identity information". However, since such | |
2304 | * implementations are not known of and in order to not over | |
2305 | * complicate our implementation, simply pretend that we never | |
2306 | * received an IRK for such a device. | |
2307 | */ | |
2308 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
2309 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 2310 | goto distribute; |
a9a58f86 JH |
2311 | } |
2312 | ||
fd349c02 JH |
2313 | bacpy(&smp->id_addr, &info->bdaddr); |
2314 | smp->id_addr_type = info->addr_type; | |
2315 | ||
2316 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
2317 | bacpy(&rpa, &hcon->dst); | |
2318 | else | |
2319 | bacpy(&rpa, BDADDR_ANY); | |
2320 | ||
23d0e128 JH |
2321 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
2322 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 2323 | |
31dd624e | 2324 | distribute: |
c6e81e9a JH |
2325 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
2326 | smp_distribute_keys(smp); | |
fd349c02 JH |
2327 | |
2328 | return 0; | |
2329 | } | |
2330 | ||
7ee4ea36 MH |
2331 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2332 | { | |
2333 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
2334 | struct l2cap_chan *chan = conn->smp; |
2335 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
2336 | struct smp_csrk *csrk; |
2337 | ||
2338 | BT_DBG("conn %p", conn); | |
2339 | ||
2340 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2341 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 2342 | |
7ee4ea36 MH |
2343 | /* Mark the information as received */ |
2344 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
2345 | ||
2346 | skb_pull(skb, sizeof(*rp)); | |
2347 | ||
7ee4ea36 MH |
2348 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
2349 | if (csrk) { | |
2350 | csrk->master = 0x01; | |
2351 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
2352 | } | |
2353 | smp->csrk = csrk; | |
d6268e86 | 2354 | smp_distribute_keys(smp); |
7ee4ea36 MH |
2355 | |
2356 | return 0; | |
2357 | } | |
2358 | ||
5e3d3d9b JH |
2359 | static u8 sc_select_method(struct smp_chan *smp) |
2360 | { | |
2361 | struct l2cap_conn *conn = smp->conn; | |
2362 | struct hci_conn *hcon = conn->hcon; | |
2363 | struct smp_cmd_pairing *local, *remote; | |
2364 | u8 local_mitm, remote_mitm, local_io, remote_io, method; | |
2365 | ||
a29b0733 JH |
2366 | if (test_bit(SMP_FLAG_OOB, &smp->flags)) |
2367 | return REQ_OOB; | |
2368 | ||
5e3d3d9b JH |
2369 | /* The preq/prsp contain the raw Pairing Request/Response PDUs |
2370 | * which are needed as inputs to some crypto functions. To get | |
2371 | * the "struct smp_cmd_pairing" from them we need to skip the | |
2372 | * first byte which contains the opcode. | |
2373 | */ | |
2374 | if (hcon->out) { | |
2375 | local = (void *) &smp->preq[1]; | |
2376 | remote = (void *) &smp->prsp[1]; | |
2377 | } else { | |
2378 | local = (void *) &smp->prsp[1]; | |
2379 | remote = (void *) &smp->preq[1]; | |
2380 | } | |
2381 | ||
2382 | local_io = local->io_capability; | |
2383 | remote_io = remote->io_capability; | |
2384 | ||
2385 | local_mitm = (local->auth_req & SMP_AUTH_MITM); | |
2386 | remote_mitm = (remote->auth_req & SMP_AUTH_MITM); | |
2387 | ||
2388 | /* If either side wants MITM, look up the method from the table, | |
2389 | * otherwise use JUST WORKS. | |
2390 | */ | |
2391 | if (local_mitm || remote_mitm) | |
2392 | method = get_auth_method(smp, local_io, remote_io); | |
2393 | else | |
2394 | method = JUST_WORKS; | |
2395 | ||
2396 | /* Don't confirm locally initiated pairing attempts */ | |
2397 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) | |
2398 | method = JUST_WORKS; | |
2399 | ||
2400 | return method; | |
2401 | } | |
2402 | ||
d8f8edbe JH |
2403 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
2404 | { | |
2405 | struct smp_cmd_public_key *key = (void *) skb->data; | |
2406 | struct hci_conn *hcon = conn->hcon; | |
2407 | struct l2cap_chan *chan = conn->smp; | |
2408 | struct smp_chan *smp = chan->data; | |
5e3d3d9b | 2409 | struct hci_dev *hdev = hcon->hdev; |
cbbbe3e2 | 2410 | struct smp_cmd_pairing_confirm cfm; |
d8f8edbe JH |
2411 | int err; |
2412 | ||
2413 | BT_DBG("conn %p", conn); | |
2414 | ||
2415 | if (skb->len < sizeof(*key)) | |
2416 | return SMP_INVALID_PARAMS; | |
2417 | ||
2418 | memcpy(smp->remote_pk, key, 64); | |
2419 | ||
2420 | /* Non-initiating device sends its public key after receiving | |
2421 | * the key from the initiating device. | |
2422 | */ | |
2423 | if (!hcon->out) { | |
2424 | err = sc_send_public_key(smp); | |
2425 | if (err) | |
2426 | return err; | |
2427 | } | |
2428 | ||
c7a3d57d JH |
2429 | SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk); |
2430 | SMP_DBG("Remote Public Key Y: %32phN", &smp->remote_pk[32]); | |
d8f8edbe JH |
2431 | |
2432 | if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey)) | |
2433 | return SMP_UNSPECIFIED; | |
2434 | ||
c7a3d57d | 2435 | SMP_DBG("DHKey %32phN", smp->dhkey); |
d8f8edbe JH |
2436 | |
2437 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
2438 | ||
5e3d3d9b JH |
2439 | smp->method = sc_select_method(smp); |
2440 | ||
2441 | BT_DBG("%s selected method 0x%02x", hdev->name, smp->method); | |
2442 | ||
2443 | /* JUST_WORKS and JUST_CFM result in an unauthenticated key */ | |
2444 | if (smp->method == JUST_WORKS || smp->method == JUST_CFM) | |
2445 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; | |
2446 | else | |
2447 | hcon->pending_sec_level = BT_SECURITY_FIPS; | |
2448 | ||
aeb7d461 JH |
2449 | if (!memcmp(debug_pk, smp->remote_pk, 64)) |
2450 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
2451 | ||
38606f14 JH |
2452 | if (smp->method == DSP_PASSKEY) { |
2453 | get_random_bytes(&hcon->passkey_notify, | |
2454 | sizeof(hcon->passkey_notify)); | |
2455 | hcon->passkey_notify %= 1000000; | |
2456 | hcon->passkey_entered = 0; | |
2457 | smp->passkey_round = 0; | |
2458 | if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type, | |
2459 | hcon->dst_type, | |
2460 | hcon->passkey_notify, | |
2461 | hcon->passkey_entered)) | |
2462 | return SMP_UNSPECIFIED; | |
2463 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2464 | return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY); | |
2465 | } | |
2466 | ||
a29b0733 JH |
2467 | if (smp->method == REQ_OOB) { |
2468 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk, | |
2469 | smp->rr, 0, cfm.confirm_val); | |
2470 | if (err) | |
2471 | return SMP_UNSPECIFIED; | |
2472 | ||
2473 | if (memcmp(cfm.confirm_val, smp->pcnf, 16)) | |
2474 | return SMP_CONFIRM_FAILED; | |
2475 | ||
2476 | if (hcon->out) | |
2477 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2478 | sizeof(smp->prnd), smp->prnd); | |
2479 | ||
2480 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2481 | ||
2482 | return 0; | |
2483 | } | |
2484 | ||
38606f14 JH |
2485 | if (hcon->out) |
2486 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2487 | ||
2488 | if (smp->method == REQ_PASSKEY) { | |
2489 | if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type, | |
2490 | hcon->dst_type)) | |
2491 | return SMP_UNSPECIFIED; | |
2492 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2493 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
2494 | return 0; | |
2495 | } | |
2496 | ||
cbbbe3e2 JH |
2497 | /* The Initiating device waits for the non-initiating device to |
2498 | * send the confirm value. | |
2499 | */ | |
2500 | if (conn->hcon->out) | |
2501 | return 0; | |
2502 | ||
2503 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, | |
2504 | 0, cfm.confirm_val); | |
2505 | if (err) | |
2506 | return SMP_UNSPECIFIED; | |
2507 | ||
2508 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
2509 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2510 | ||
d8f8edbe JH |
2511 | return 0; |
2512 | } | |
2513 | ||
6433a9a2 JH |
2514 | static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb) |
2515 | { | |
2516 | struct smp_cmd_dhkey_check *check = (void *) skb->data; | |
2517 | struct l2cap_chan *chan = conn->smp; | |
2518 | struct hci_conn *hcon = conn->hcon; | |
2519 | struct smp_chan *smp = chan->data; | |
2520 | u8 a[7], b[7], *local_addr, *remote_addr; | |
2521 | u8 io_cap[3], r[16], e[16]; | |
2522 | int err; | |
2523 | ||
2524 | BT_DBG("conn %p", conn); | |
2525 | ||
2526 | if (skb->len < sizeof(*check)) | |
2527 | return SMP_INVALID_PARAMS; | |
2528 | ||
2529 | memcpy(a, &hcon->init_addr, 6); | |
2530 | memcpy(b, &hcon->resp_addr, 6); | |
2531 | a[6] = hcon->init_addr_type; | |
2532 | b[6] = hcon->resp_addr_type; | |
2533 | ||
2534 | if (hcon->out) { | |
2535 | local_addr = a; | |
2536 | remote_addr = b; | |
2537 | memcpy(io_cap, &smp->prsp[1], 3); | |
2538 | } else { | |
2539 | local_addr = b; | |
2540 | remote_addr = a; | |
2541 | memcpy(io_cap, &smp->preq[1], 3); | |
2542 | } | |
2543 | ||
2544 | memset(r, 0, sizeof(r)); | |
2545 | ||
38606f14 JH |
2546 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2547 | put_unaligned_le32(hcon->passkey_notify, r); | |
2548 | ||
6433a9a2 JH |
2549 | err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r, |
2550 | io_cap, remote_addr, local_addr, e); | |
2551 | if (err) | |
2552 | return SMP_UNSPECIFIED; | |
2553 | ||
2554 | if (memcmp(check->e, e, 16)) | |
2555 | return SMP_DHKEY_CHECK_FAILED; | |
2556 | ||
d3e54a87 JH |
2557 | if (!hcon->out) { |
2558 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
2559 | set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags); | |
2560 | return 0; | |
2561 | } | |
d378a2d7 | 2562 | |
d3e54a87 JH |
2563 | /* Slave sends DHKey check as response to master */ |
2564 | sc_dhkey_check(smp); | |
2565 | } | |
d378a2d7 | 2566 | |
d3e54a87 | 2567 | sc_add_ltk(smp); |
6433a9a2 JH |
2568 | |
2569 | if (hcon->out) { | |
2570 | hci_le_start_enc(hcon, 0, 0, smp->tk); | |
2571 | hcon->enc_key_size = smp->enc_key_size; | |
2572 | } | |
2573 | ||
2574 | return 0; | |
2575 | } | |
2576 | ||
1408bb6e JH |
2577 | static int smp_cmd_keypress_notify(struct l2cap_conn *conn, |
2578 | struct sk_buff *skb) | |
2579 | { | |
2580 | struct smp_cmd_keypress_notify *kp = (void *) skb->data; | |
2581 | ||
2582 | BT_DBG("value 0x%02x", kp->value); | |
2583 | ||
2584 | return 0; | |
2585 | } | |
2586 | ||
4befb867 | 2587 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 2588 | { |
5d88cc73 | 2589 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 2590 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 2591 | struct smp_chan *smp; |
92381f5c | 2592 | __u8 code, reason; |
eb492e01 AB |
2593 | int err = 0; |
2594 | ||
8ae9b984 | 2595 | if (skb->len < 1) |
92381f5c | 2596 | return -EILSEQ; |
92381f5c | 2597 | |
06ae3314 | 2598 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
2599 | reason = SMP_PAIRING_NOTSUPP; |
2600 | goto done; | |
2601 | } | |
2602 | ||
92381f5c | 2603 | code = skb->data[0]; |
eb492e01 AB |
2604 | skb_pull(skb, sizeof(code)); |
2605 | ||
b28b4943 JH |
2606 | smp = chan->data; |
2607 | ||
2608 | if (code > SMP_CMD_MAX) | |
2609 | goto drop; | |
2610 | ||
24bd0bd9 | 2611 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
2612 | goto drop; |
2613 | ||
2614 | /* If we don't have a context the only allowed commands are | |
2615 | * pairing request and security request. | |
8cf9fa12 | 2616 | */ |
b28b4943 JH |
2617 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
2618 | goto drop; | |
8cf9fa12 | 2619 | |
eb492e01 AB |
2620 | switch (code) { |
2621 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 2622 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
2623 | break; |
2624 | ||
2625 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 2626 | smp_failure(conn, 0); |
da85e5e5 | 2627 | err = -EPERM; |
eb492e01 AB |
2628 | break; |
2629 | ||
2630 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 2631 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
2632 | break; |
2633 | ||
2634 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 2635 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
2636 | break; |
2637 | ||
eb492e01 | 2638 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 2639 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
2640 | break; |
2641 | ||
eb492e01 | 2642 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 2643 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
2644 | break; |
2645 | ||
eb492e01 | 2646 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
2647 | reason = smp_cmd_encrypt_info(conn, skb); |
2648 | break; | |
2649 | ||
eb492e01 | 2650 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
2651 | reason = smp_cmd_master_ident(conn, skb); |
2652 | break; | |
2653 | ||
eb492e01 | 2654 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
2655 | reason = smp_cmd_ident_info(conn, skb); |
2656 | break; | |
2657 | ||
eb492e01 | 2658 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
2659 | reason = smp_cmd_ident_addr_info(conn, skb); |
2660 | break; | |
2661 | ||
eb492e01 | 2662 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 2663 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
2664 | break; |
2665 | ||
d8f8edbe JH |
2666 | case SMP_CMD_PUBLIC_KEY: |
2667 | reason = smp_cmd_public_key(conn, skb); | |
2668 | break; | |
2669 | ||
6433a9a2 JH |
2670 | case SMP_CMD_DHKEY_CHECK: |
2671 | reason = smp_cmd_dhkey_check(conn, skb); | |
2672 | break; | |
2673 | ||
1408bb6e JH |
2674 | case SMP_CMD_KEYPRESS_NOTIFY: |
2675 | reason = smp_cmd_keypress_notify(conn, skb); | |
2676 | break; | |
2677 | ||
eb492e01 AB |
2678 | default: |
2679 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 2680 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 2681 | goto done; |
eb492e01 AB |
2682 | } |
2683 | ||
3a0259bb | 2684 | done: |
9b7b18ef JH |
2685 | if (!err) { |
2686 | if (reason) | |
2687 | smp_failure(conn, reason); | |
8ae9b984 | 2688 | kfree_skb(skb); |
9b7b18ef JH |
2689 | } |
2690 | ||
eb492e01 | 2691 | return err; |
b28b4943 JH |
2692 | |
2693 | drop: | |
2694 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
2695 | code, &hcon->dst); | |
2696 | kfree_skb(skb); | |
2697 | return 0; | |
eb492e01 | 2698 | } |
7034b911 | 2699 | |
70db83c4 JH |
2700 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
2701 | { | |
2702 | struct l2cap_conn *conn = chan->conn; | |
2703 | ||
2704 | BT_DBG("chan %p", chan); | |
2705 | ||
fc75cc86 | 2706 | if (chan->data) |
5d88cc73 | 2707 | smp_chan_destroy(conn); |
5d88cc73 | 2708 | |
70db83c4 JH |
2709 | conn->smp = NULL; |
2710 | l2cap_chan_put(chan); | |
2711 | } | |
2712 | ||
b5ae344d JH |
2713 | static void bredr_pairing(struct l2cap_chan *chan) |
2714 | { | |
2715 | struct l2cap_conn *conn = chan->conn; | |
2716 | struct hci_conn *hcon = conn->hcon; | |
2717 | struct hci_dev *hdev = hcon->hdev; | |
2718 | struct smp_cmd_pairing req; | |
2719 | struct smp_chan *smp; | |
2720 | ||
2721 | BT_DBG("chan %p", chan); | |
2722 | ||
2723 | /* Only new pairings are interesting */ | |
2724 | if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags)) | |
2725 | return; | |
2726 | ||
2727 | /* Don't bother if we're not encrypted */ | |
2728 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
2729 | return; | |
2730 | ||
2731 | /* Only master may initiate SMP over BR/EDR */ | |
2732 | if (hcon->role != HCI_ROLE_MASTER) | |
2733 | return; | |
2734 | ||
2735 | /* Secure Connections support must be enabled */ | |
2736 | if (!test_bit(HCI_SC_ENABLED, &hdev->dev_flags)) | |
2737 | return; | |
2738 | ||
2739 | /* BR/EDR must use Secure Connections for SMP */ | |
2740 | if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) && | |
2741 | !test_bit(HCI_FORCE_LESC, &hdev->dbg_flags)) | |
2742 | return; | |
2743 | ||
2744 | /* If our LE support is not enabled don't do anything */ | |
2745 | if (!test_bit(HCI_LE_ENABLED, &hdev->dev_flags)) | |
2746 | return; | |
2747 | ||
2748 | /* Don't bother if remote LE support is not enabled */ | |
2749 | if (!lmp_host_le_capable(hcon)) | |
2750 | return; | |
2751 | ||
2752 | /* Remote must support SMP fixed chan for BR/EDR */ | |
2753 | if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR)) | |
2754 | return; | |
2755 | ||
2756 | /* Don't bother if SMP is already ongoing */ | |
2757 | if (chan->data) | |
2758 | return; | |
2759 | ||
2760 | smp = smp_chan_create(conn); | |
2761 | if (!smp) { | |
2762 | BT_ERR("%s unable to create SMP context for BR/EDR", | |
2763 | hdev->name); | |
2764 | return; | |
2765 | } | |
2766 | ||
2767 | set_bit(SMP_FLAG_SC, &smp->flags); | |
2768 | ||
2769 | BT_DBG("%s starting SMP over BR/EDR", hdev->name); | |
2770 | ||
2771 | /* Prepare and send the BR/EDR SMP Pairing Request */ | |
2772 | build_bredr_pairing_cmd(smp, &req, NULL); | |
2773 | ||
2774 | smp->preq[0] = SMP_CMD_PAIRING_REQ; | |
2775 | memcpy(&smp->preq[1], &req, sizeof(req)); | |
2776 | ||
2777 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req); | |
2778 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); | |
2779 | } | |
2780 | ||
44f1a7ab JH |
2781 | static void smp_resume_cb(struct l2cap_chan *chan) |
2782 | { | |
b68fda68 | 2783 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
2784 | struct l2cap_conn *conn = chan->conn; |
2785 | struct hci_conn *hcon = conn->hcon; | |
2786 | ||
2787 | BT_DBG("chan %p", chan); | |
2788 | ||
b5ae344d JH |
2789 | if (hcon->type == ACL_LINK) { |
2790 | bredr_pairing(chan); | |
ef8efe4b | 2791 | return; |
b5ae344d | 2792 | } |
ef8efe4b | 2793 | |
86d1407c JH |
2794 | if (!smp) |
2795 | return; | |
b68fda68 | 2796 | |
84bc0db5 JH |
2797 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
2798 | return; | |
2799 | ||
86d1407c JH |
2800 | cancel_delayed_work(&smp->security_timer); |
2801 | ||
d6268e86 | 2802 | smp_distribute_keys(smp); |
44f1a7ab JH |
2803 | } |
2804 | ||
70db83c4 JH |
2805 | static void smp_ready_cb(struct l2cap_chan *chan) |
2806 | { | |
2807 | struct l2cap_conn *conn = chan->conn; | |
b5ae344d | 2808 | struct hci_conn *hcon = conn->hcon; |
70db83c4 JH |
2809 | |
2810 | BT_DBG("chan %p", chan); | |
2811 | ||
2812 | conn->smp = chan; | |
2813 | l2cap_chan_hold(chan); | |
b5ae344d JH |
2814 | |
2815 | if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
2816 | bredr_pairing(chan); | |
70db83c4 JH |
2817 | } |
2818 | ||
4befb867 JH |
2819 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
2820 | { | |
2821 | int err; | |
2822 | ||
2823 | BT_DBG("chan %p", chan); | |
2824 | ||
2825 | err = smp_sig_channel(chan, skb); | |
2826 | if (err) { | |
b68fda68 | 2827 | struct smp_chan *smp = chan->data; |
4befb867 | 2828 | |
b68fda68 JH |
2829 | if (smp) |
2830 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 2831 | |
1e91c29e | 2832 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
2833 | } |
2834 | ||
2835 | return err; | |
2836 | } | |
2837 | ||
70db83c4 JH |
2838 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
2839 | unsigned long hdr_len, | |
2840 | unsigned long len, int nb) | |
2841 | { | |
2842 | struct sk_buff *skb; | |
2843 | ||
2844 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
2845 | if (!skb) | |
2846 | return ERR_PTR(-ENOMEM); | |
2847 | ||
2848 | skb->priority = HCI_PRIO_MAX; | |
2849 | bt_cb(skb)->chan = chan; | |
2850 | ||
2851 | return skb; | |
2852 | } | |
2853 | ||
2854 | static const struct l2cap_ops smp_chan_ops = { | |
2855 | .name = "Security Manager", | |
2856 | .ready = smp_ready_cb, | |
5d88cc73 | 2857 | .recv = smp_recv_cb, |
70db83c4 JH |
2858 | .alloc_skb = smp_alloc_skb_cb, |
2859 | .teardown = smp_teardown_cb, | |
44f1a7ab | 2860 | .resume = smp_resume_cb, |
70db83c4 JH |
2861 | |
2862 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
2863 | .state_change = l2cap_chan_no_state_change, |
2864 | .close = l2cap_chan_no_close, | |
2865 | .defer = l2cap_chan_no_defer, | |
2866 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
2867 | .set_shutdown = l2cap_chan_no_set_shutdown, |
2868 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
2869 | }; |
2870 | ||
2871 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
2872 | { | |
2873 | struct l2cap_chan *chan; | |
2874 | ||
2875 | BT_DBG("pchan %p", pchan); | |
2876 | ||
2877 | chan = l2cap_chan_create(); | |
2878 | if (!chan) | |
2879 | return NULL; | |
2880 | ||
2881 | chan->chan_type = pchan->chan_type; | |
2882 | chan->ops = &smp_chan_ops; | |
2883 | chan->scid = pchan->scid; | |
2884 | chan->dcid = chan->scid; | |
2885 | chan->imtu = pchan->imtu; | |
2886 | chan->omtu = pchan->omtu; | |
2887 | chan->mode = pchan->mode; | |
2888 | ||
abe84903 JH |
2889 | /* Other L2CAP channels may request SMP routines in order to |
2890 | * change the security level. This means that the SMP channel | |
2891 | * lock must be considered in its own category to avoid lockdep | |
2892 | * warnings. | |
2893 | */ | |
2894 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
2895 | ||
70db83c4 JH |
2896 | BT_DBG("created chan %p", chan); |
2897 | ||
2898 | return chan; | |
2899 | } | |
2900 | ||
2901 | static const struct l2cap_ops smp_root_chan_ops = { | |
2902 | .name = "Security Manager Root", | |
2903 | .new_connection = smp_new_conn_cb, | |
2904 | ||
2905 | /* None of these are implemented for the root channel */ | |
2906 | .close = l2cap_chan_no_close, | |
2907 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
2908 | .recv = l2cap_chan_no_recv, | |
2909 | .state_change = l2cap_chan_no_state_change, | |
2910 | .teardown = l2cap_chan_no_teardown, | |
2911 | .ready = l2cap_chan_no_ready, | |
2912 | .defer = l2cap_chan_no_defer, | |
2913 | .suspend = l2cap_chan_no_suspend, | |
2914 | .resume = l2cap_chan_no_resume, | |
2915 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
2916 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
2917 | }; |
2918 | ||
ef8efe4b | 2919 | static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) |
711eafe3 | 2920 | { |
70db83c4 | 2921 | struct l2cap_chan *chan; |
defce9e8 | 2922 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 2923 | |
ef8efe4b JH |
2924 | if (cid == L2CAP_CID_SMP_BREDR) { |
2925 | tfm_aes = NULL; | |
2926 | goto create_chan; | |
2927 | } | |
711eafe3 | 2928 | |
adae20cb | 2929 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, 0); |
defce9e8 | 2930 | if (IS_ERR(tfm_aes)) { |
711eafe3 | 2931 | BT_ERR("Unable to create crypto context"); |
fe700771 | 2932 | return ERR_CAST(tfm_aes); |
711eafe3 JH |
2933 | } |
2934 | ||
ef8efe4b | 2935 | create_chan: |
70db83c4 JH |
2936 | chan = l2cap_chan_create(); |
2937 | if (!chan) { | |
defce9e8 | 2938 | crypto_free_blkcipher(tfm_aes); |
ef8efe4b | 2939 | return ERR_PTR(-ENOMEM); |
70db83c4 JH |
2940 | } |
2941 | ||
defce9e8 JH |
2942 | chan->data = tfm_aes; |
2943 | ||
ef8efe4b | 2944 | l2cap_add_scid(chan, cid); |
70db83c4 JH |
2945 | |
2946 | l2cap_chan_set_defaults(chan); | |
2947 | ||
2948 | bacpy(&chan->src, &hdev->bdaddr); | |
ef8efe4b JH |
2949 | if (cid == L2CAP_CID_SMP) |
2950 | chan->src_type = BDADDR_LE_PUBLIC; | |
2951 | else | |
2952 | chan->src_type = BDADDR_BREDR; | |
70db83c4 JH |
2953 | chan->state = BT_LISTEN; |
2954 | chan->mode = L2CAP_MODE_BASIC; | |
2955 | chan->imtu = L2CAP_DEFAULT_MTU; | |
2956 | chan->ops = &smp_root_chan_ops; | |
2957 | ||
abe84903 JH |
2958 | /* Set correct nesting level for a parent/listening channel */ |
2959 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
2960 | ||
ef8efe4b | 2961 | return chan; |
711eafe3 JH |
2962 | } |
2963 | ||
ef8efe4b | 2964 | static void smp_del_chan(struct l2cap_chan *chan) |
711eafe3 | 2965 | { |
ef8efe4b | 2966 | struct crypto_blkcipher *tfm_aes; |
70db83c4 | 2967 | |
ef8efe4b | 2968 | BT_DBG("chan %p", chan); |
711eafe3 | 2969 | |
defce9e8 JH |
2970 | tfm_aes = chan->data; |
2971 | if (tfm_aes) { | |
2972 | chan->data = NULL; | |
2973 | crypto_free_blkcipher(tfm_aes); | |
711eafe3 | 2974 | } |
70db83c4 | 2975 | |
70db83c4 | 2976 | l2cap_chan_put(chan); |
711eafe3 | 2977 | } |
ef8efe4b JH |
2978 | |
2979 | int smp_register(struct hci_dev *hdev) | |
2980 | { | |
2981 | struct l2cap_chan *chan; | |
2982 | ||
2983 | BT_DBG("%s", hdev->name); | |
2984 | ||
2985 | chan = smp_add_cid(hdev, L2CAP_CID_SMP); | |
2986 | if (IS_ERR(chan)) | |
2987 | return PTR_ERR(chan); | |
2988 | ||
2989 | hdev->smp_data = chan; | |
2990 | ||
2991 | if (!lmp_sc_capable(hdev) && | |
2992 | !test_bit(HCI_FORCE_LESC, &hdev->dbg_flags)) | |
2993 | return 0; | |
2994 | ||
2995 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); | |
2996 | if (IS_ERR(chan)) { | |
2997 | int err = PTR_ERR(chan); | |
2998 | chan = hdev->smp_data; | |
2999 | hdev->smp_data = NULL; | |
3000 | smp_del_chan(chan); | |
3001 | return err; | |
3002 | } | |
3003 | ||
3004 | hdev->smp_bredr_data = chan; | |
3005 | ||
3006 | return 0; | |
3007 | } | |
3008 | ||
3009 | void smp_unregister(struct hci_dev *hdev) | |
3010 | { | |
3011 | struct l2cap_chan *chan; | |
3012 | ||
3013 | if (hdev->smp_bredr_data) { | |
3014 | chan = hdev->smp_bredr_data; | |
3015 | hdev->smp_bredr_data = NULL; | |
3016 | smp_del_chan(chan); | |
3017 | } | |
3018 | ||
3019 | if (hdev->smp_data) { | |
3020 | chan = hdev->smp_data; | |
3021 | hdev->smp_data = NULL; | |
3022 | smp_del_chan(chan); | |
3023 | } | |
3024 | } |