Commit | Line | Data |
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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
300acfde | 23 | #include <linux/debugfs.h> |
8c520a59 GP |
24 | #include <linux/crypto.h> |
25 | #include <linux/scatterlist.h> | |
26 | #include <crypto/b128ops.h> | |
27 | ||
eb492e01 AB |
28 | #include <net/bluetooth/bluetooth.h> |
29 | #include <net/bluetooth/hci_core.h> | |
30 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 31 | #include <net/bluetooth/mgmt.h> |
ac4b7236 | 32 | |
3b19146d | 33 | #include "ecc.h" |
ac4b7236 | 34 | #include "smp.h" |
d22ef0bc | 35 | |
c7a3d57d JH |
36 | /* Low-level debug macros to be used for stuff that we don't want |
37 | * accidentially in dmesg, i.e. the values of the various crypto keys | |
38 | * and the inputs & outputs of crypto functions. | |
39 | */ | |
40 | #ifdef DEBUG | |
41 | #define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
42 | ##__VA_ARGS__) | |
43 | #else | |
44 | #define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
45 | ##__VA_ARGS__) | |
46 | #endif | |
47 | ||
b28b4943 | 48 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 49 | |
3b19146d JH |
50 | /* Keys which are not distributed with Secure Connections */ |
51 | #define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY); | |
52 | ||
17b02e62 | 53 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 54 | |
d7a5a11d | 55 | #define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \ |
0edb14de JH |
56 | 0x1f : 0x07) |
57 | #define KEY_DIST_MASK 0x07 | |
065a13e2 | 58 | |
cbbbe3e2 JH |
59 | /* Maximum message length that can be passed to aes_cmac */ |
60 | #define CMAC_MSG_MAX 80 | |
61 | ||
533e35d4 JH |
62 | enum { |
63 | SMP_FLAG_TK_VALID, | |
64 | SMP_FLAG_CFM_PENDING, | |
65 | SMP_FLAG_MITM_AUTH, | |
66 | SMP_FLAG_COMPLETE, | |
67 | SMP_FLAG_INITIATOR, | |
65668776 | 68 | SMP_FLAG_SC, |
d8f8edbe | 69 | SMP_FLAG_REMOTE_PK, |
aeb7d461 | 70 | SMP_FLAG_DEBUG_KEY, |
38606f14 | 71 | SMP_FLAG_WAIT_USER, |
d3e54a87 | 72 | SMP_FLAG_DHKEY_PENDING, |
1a8bab4f JH |
73 | SMP_FLAG_REMOTE_OOB, |
74 | SMP_FLAG_LOCAL_OOB, | |
533e35d4 | 75 | }; |
4bc58f51 | 76 | |
88a479d9 | 77 | struct smp_dev { |
60a27d65 MH |
78 | /* Secure Connections OOB data */ |
79 | u8 local_pk[64]; | |
80 | u8 local_sk[32]; | |
81 | u8 local_rr[16]; | |
82 | bool debug_key; | |
83 | ||
88a479d9 | 84 | struct crypto_blkcipher *tfm_aes; |
6e2dc6d1 | 85 | struct crypto_hash *tfm_cmac; |
88a479d9 MH |
86 | }; |
87 | ||
4bc58f51 | 88 | struct smp_chan { |
b68fda68 JH |
89 | struct l2cap_conn *conn; |
90 | struct delayed_work security_timer; | |
b28b4943 | 91 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 92 | |
4bc58f51 JH |
93 | u8 preq[7]; /* SMP Pairing Request */ |
94 | u8 prsp[7]; /* SMP Pairing Response */ | |
95 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
96 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
97 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
98 | u8 tk[16]; /* SMP Temporary Key */ | |
882fafad JH |
99 | u8 rr[16]; /* Remote OOB ra/rb value */ |
100 | u8 lr[16]; /* Local OOB ra/rb value */ | |
4bc58f51 JH |
101 | u8 enc_key_size; |
102 | u8 remote_key_dist; | |
103 | bdaddr_t id_addr; | |
104 | u8 id_addr_type; | |
105 | u8 irk[16]; | |
106 | struct smp_csrk *csrk; | |
107 | struct smp_csrk *slave_csrk; | |
108 | struct smp_ltk *ltk; | |
109 | struct smp_ltk *slave_ltk; | |
110 | struct smp_irk *remote_irk; | |
6a77083a | 111 | u8 *link_key; |
4a74d658 | 112 | unsigned long flags; |
783e0574 | 113 | u8 method; |
38606f14 | 114 | u8 passkey_round; |
6a7bd103 | 115 | |
3b19146d JH |
116 | /* Secure Connections variables */ |
117 | u8 local_pk[64]; | |
118 | u8 local_sk[32]; | |
d8f8edbe JH |
119 | u8 remote_pk[64]; |
120 | u8 dhkey[32]; | |
760b018b | 121 | u8 mackey[16]; |
3b19146d | 122 | |
6a7bd103 | 123 | struct crypto_blkcipher *tfm_aes; |
407cecf6 | 124 | struct crypto_hash *tfm_cmac; |
4bc58f51 JH |
125 | }; |
126 | ||
aeb7d461 JH |
127 | /* These debug key values are defined in the SMP section of the core |
128 | * specification. debug_pk is the public debug key and debug_sk the | |
129 | * private debug key. | |
130 | */ | |
131 | static const u8 debug_pk[64] = { | |
132 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
133 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
134 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
135 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20, | |
136 | ||
137 | 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74, | |
138 | 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76, | |
139 | 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63, | |
140 | 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc, | |
141 | }; | |
142 | ||
143 | static const u8 debug_sk[32] = { | |
144 | 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58, | |
145 | 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a, | |
146 | 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74, | |
147 | 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f, | |
148 | }; | |
149 | ||
8a2936f4 | 150 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 151 | { |
8a2936f4 | 152 | size_t i; |
d22ef0bc | 153 | |
8a2936f4 JH |
154 | for (i = 0; i < len; i++) |
155 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
156 | } |
157 | ||
06edf8de JH |
158 | /* The following functions map to the LE SC SMP crypto functions |
159 | * AES-CMAC, f4, f5, f6, g2 and h6. | |
160 | */ | |
161 | ||
cbbbe3e2 JH |
162 | static int aes_cmac(struct crypto_hash *tfm, const u8 k[16], const u8 *m, |
163 | size_t len, u8 mac[16]) | |
164 | { | |
165 | uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX]; | |
166 | struct hash_desc desc; | |
167 | struct scatterlist sg; | |
168 | int err; | |
169 | ||
170 | if (len > CMAC_MSG_MAX) | |
171 | return -EFBIG; | |
172 | ||
173 | if (!tfm) { | |
174 | BT_ERR("tfm %p", tfm); | |
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | desc.tfm = tfm; | |
179 | desc.flags = 0; | |
180 | ||
181 | crypto_hash_init(&desc); | |
182 | ||
183 | /* Swap key and message from LSB to MSB */ | |
184 | swap_buf(k, tmp, 16); | |
185 | swap_buf(m, msg_msb, len); | |
186 | ||
c7a3d57d JH |
187 | SMP_DBG("msg (len %zu) %*phN", len, (int) len, m); |
188 | SMP_DBG("key %16phN", k); | |
cbbbe3e2 JH |
189 | |
190 | err = crypto_hash_setkey(tfm, tmp, 16); | |
191 | if (err) { | |
192 | BT_ERR("cipher setkey failed: %d", err); | |
193 | return err; | |
194 | } | |
195 | ||
196 | sg_init_one(&sg, msg_msb, len); | |
197 | ||
198 | err = crypto_hash_update(&desc, &sg, len); | |
199 | if (err) { | |
200 | BT_ERR("Hash update error %d", err); | |
201 | return err; | |
202 | } | |
203 | ||
204 | err = crypto_hash_final(&desc, mac_msb); | |
205 | if (err) { | |
206 | BT_ERR("Hash final error %d", err); | |
207 | return err; | |
208 | } | |
209 | ||
210 | swap_buf(mac_msb, mac, 16); | |
211 | ||
c7a3d57d | 212 | SMP_DBG("mac %16phN", mac); |
cbbbe3e2 JH |
213 | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int smp_f4(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32], | |
218 | const u8 x[16], u8 z, u8 res[16]) | |
219 | { | |
220 | u8 m[65]; | |
221 | int err; | |
222 | ||
c7a3d57d JH |
223 | SMP_DBG("u %32phN", u); |
224 | SMP_DBG("v %32phN", v); | |
225 | SMP_DBG("x %16phN z %02x", x, z); | |
cbbbe3e2 JH |
226 | |
227 | m[0] = z; | |
228 | memcpy(m + 1, v, 32); | |
229 | memcpy(m + 33, u, 32); | |
230 | ||
231 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), res); | |
232 | if (err) | |
233 | return err; | |
234 | ||
c7a3d57d | 235 | SMP_DBG("res %16phN", res); |
cbbbe3e2 JH |
236 | |
237 | return err; | |
238 | } | |
239 | ||
4da50de8 JH |
240 | static int smp_f5(struct crypto_hash *tfm_cmac, const u8 w[32], |
241 | const u8 n1[16], const u8 n2[16], const u8 a1[7], | |
242 | const u8 a2[7], u8 mackey[16], u8 ltk[16]) | |
760b018b JH |
243 | { |
244 | /* The btle, salt and length "magic" values are as defined in | |
245 | * the SMP section of the Bluetooth core specification. In ASCII | |
246 | * the btle value ends up being 'btle'. The salt is just a | |
247 | * random number whereas length is the value 256 in little | |
248 | * endian format. | |
249 | */ | |
250 | const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 }; | |
251 | const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60, | |
252 | 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c }; | |
253 | const u8 length[2] = { 0x00, 0x01 }; | |
254 | u8 m[53], t[16]; | |
255 | int err; | |
256 | ||
c7a3d57d JH |
257 | SMP_DBG("w %32phN", w); |
258 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
259 | SMP_DBG("a1 %7phN a2 %7phN", a1, a2); | |
760b018b JH |
260 | |
261 | err = aes_cmac(tfm_cmac, salt, w, 32, t); | |
262 | if (err) | |
263 | return err; | |
264 | ||
c7a3d57d | 265 | SMP_DBG("t %16phN", t); |
760b018b JH |
266 | |
267 | memcpy(m, length, 2); | |
268 | memcpy(m + 2, a2, 7); | |
269 | memcpy(m + 9, a1, 7); | |
270 | memcpy(m + 16, n2, 16); | |
271 | memcpy(m + 32, n1, 16); | |
272 | memcpy(m + 48, btle, 4); | |
273 | ||
274 | m[52] = 0; /* Counter */ | |
275 | ||
276 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey); | |
277 | if (err) | |
278 | return err; | |
279 | ||
c7a3d57d | 280 | SMP_DBG("mackey %16phN", mackey); |
760b018b JH |
281 | |
282 | m[52] = 1; /* Counter */ | |
283 | ||
284 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk); | |
285 | if (err) | |
286 | return err; | |
287 | ||
c7a3d57d | 288 | SMP_DBG("ltk %16phN", ltk); |
760b018b JH |
289 | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static int smp_f6(struct crypto_hash *tfm_cmac, const u8 w[16], | |
4da50de8 | 294 | const u8 n1[16], const u8 n2[16], const u8 r[16], |
760b018b JH |
295 | const u8 io_cap[3], const u8 a1[7], const u8 a2[7], |
296 | u8 res[16]) | |
297 | { | |
298 | u8 m[65]; | |
299 | int err; | |
300 | ||
c7a3d57d JH |
301 | SMP_DBG("w %16phN", w); |
302 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
303 | SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2); | |
760b018b JH |
304 | |
305 | memcpy(m, a2, 7); | |
306 | memcpy(m + 7, a1, 7); | |
307 | memcpy(m + 14, io_cap, 3); | |
308 | memcpy(m + 17, r, 16); | |
309 | memcpy(m + 33, n2, 16); | |
310 | memcpy(m + 49, n1, 16); | |
311 | ||
312 | err = aes_cmac(tfm_cmac, w, m, sizeof(m), res); | |
313 | if (err) | |
314 | return err; | |
315 | ||
203de21b | 316 | SMP_DBG("res %16phN", res); |
760b018b JH |
317 | |
318 | return err; | |
319 | } | |
320 | ||
191dc7fe JH |
321 | static int smp_g2(struct crypto_hash *tfm_cmac, const u8 u[32], const u8 v[32], |
322 | const u8 x[16], const u8 y[16], u32 *val) | |
323 | { | |
324 | u8 m[80], tmp[16]; | |
325 | int err; | |
326 | ||
c7a3d57d JH |
327 | SMP_DBG("u %32phN", u); |
328 | SMP_DBG("v %32phN", v); | |
329 | SMP_DBG("x %16phN y %16phN", x, y); | |
191dc7fe JH |
330 | |
331 | memcpy(m, y, 16); | |
332 | memcpy(m + 16, v, 32); | |
333 | memcpy(m + 48, u, 32); | |
334 | ||
335 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp); | |
336 | if (err) | |
337 | return err; | |
338 | ||
339 | *val = get_unaligned_le32(tmp); | |
340 | *val %= 1000000; | |
341 | ||
c7a3d57d | 342 | SMP_DBG("val %06u", *val); |
191dc7fe JH |
343 | |
344 | return 0; | |
345 | } | |
346 | ||
06edf8de JH |
347 | static int smp_h6(struct crypto_hash *tfm_cmac, const u8 w[16], |
348 | const u8 key_id[4], u8 res[16]) | |
349 | { | |
350 | int err; | |
351 | ||
352 | SMP_DBG("w %16phN key_id %4phN", w, key_id); | |
353 | ||
354 | err = aes_cmac(tfm_cmac, w, key_id, 4, res); | |
355 | if (err) | |
356 | return err; | |
357 | ||
358 | SMP_DBG("res %16phN", res); | |
359 | ||
360 | return err; | |
361 | } | |
362 | ||
363 | /* The following functions map to the legacy SMP crypto functions e, c1, | |
364 | * s1 and ah. | |
365 | */ | |
366 | ||
d22ef0bc AB |
367 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) |
368 | { | |
369 | struct blkcipher_desc desc; | |
370 | struct scatterlist sg; | |
943a732a | 371 | uint8_t tmp[16], data[16]; |
201a5929 | 372 | int err; |
d22ef0bc | 373 | |
7f376cd6 | 374 | if (!tfm) { |
d22ef0bc AB |
375 | BT_ERR("tfm %p", tfm); |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | desc.tfm = tfm; | |
380 | desc.flags = 0; | |
381 | ||
943a732a | 382 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 383 | swap_buf(k, tmp, 16); |
943a732a JH |
384 | |
385 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
386 | if (err) { |
387 | BT_ERR("cipher setkey failed: %d", err); | |
388 | return err; | |
389 | } | |
390 | ||
943a732a | 391 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 392 | swap_buf(r, data, 16); |
943a732a JH |
393 | |
394 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 395 | |
d22ef0bc AB |
396 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
397 | if (err) | |
398 | BT_ERR("Encrypt data error %d", err); | |
399 | ||
943a732a | 400 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 401 | swap_buf(data, r, 16); |
943a732a | 402 | |
d22ef0bc AB |
403 | return err; |
404 | } | |
405 | ||
06edf8de JH |
406 | static int smp_c1(struct crypto_blkcipher *tfm_aes, const u8 k[16], |
407 | const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat, | |
408 | const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16]) | |
6a77083a | 409 | { |
06edf8de | 410 | u8 p1[16], p2[16]; |
6a77083a JH |
411 | int err; |
412 | ||
06edf8de | 413 | memset(p1, 0, 16); |
6a77083a | 414 | |
06edf8de JH |
415 | /* p1 = pres || preq || _rat || _iat */ |
416 | p1[0] = _iat; | |
417 | p1[1] = _rat; | |
418 | memcpy(p1 + 2, preq, 7); | |
419 | memcpy(p1 + 9, pres, 7); | |
420 | ||
421 | /* p2 = padding || ia || ra */ | |
422 | memcpy(p2, ra, 6); | |
423 | memcpy(p2 + 6, ia, 6); | |
424 | memset(p2 + 12, 0, 4); | |
425 | ||
426 | /* res = r XOR p1 */ | |
427 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
428 | ||
429 | /* res = e(k, res) */ | |
430 | err = smp_e(tfm_aes, k, res); | |
431 | if (err) { | |
432 | BT_ERR("Encrypt data error"); | |
6a77083a | 433 | return err; |
06edf8de | 434 | } |
6a77083a | 435 | |
06edf8de JH |
436 | /* res = res XOR p2 */ |
437 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
438 | ||
439 | /* res = e(k, res) */ | |
440 | err = smp_e(tfm_aes, k, res); | |
441 | if (err) | |
442 | BT_ERR("Encrypt data error"); | |
443 | ||
444 | return err; | |
445 | } | |
446 | ||
447 | static int smp_s1(struct crypto_blkcipher *tfm_aes, const u8 k[16], | |
448 | const u8 r1[16], const u8 r2[16], u8 _r[16]) | |
449 | { | |
450 | int err; | |
451 | ||
452 | /* Just least significant octets from r1 and r2 are considered */ | |
453 | memcpy(_r, r2, 8); | |
454 | memcpy(_r + 8, r1, 8); | |
455 | ||
456 | err = smp_e(tfm_aes, k, _r); | |
457 | if (err) | |
458 | BT_ERR("Encrypt data error"); | |
6a77083a JH |
459 | |
460 | return err; | |
461 | } | |
462 | ||
cd082797 JH |
463 | static int smp_ah(struct crypto_blkcipher *tfm, const u8 irk[16], |
464 | const u8 r[3], u8 res[3]) | |
60478054 | 465 | { |
943a732a | 466 | u8 _res[16]; |
60478054 JH |
467 | int err; |
468 | ||
469 | /* r' = padding || r */ | |
943a732a JH |
470 | memcpy(_res, r, 3); |
471 | memset(_res + 3, 0, 13); | |
60478054 | 472 | |
943a732a | 473 | err = smp_e(tfm, irk, _res); |
60478054 JH |
474 | if (err) { |
475 | BT_ERR("Encrypt error"); | |
476 | return err; | |
477 | } | |
478 | ||
479 | /* The output of the random address function ah is: | |
480 | * ah(h, r) = e(k, r') mod 2^24 | |
481 | * The output of the security function e is then truncated to 24 bits | |
482 | * by taking the least significant 24 bits of the output of e as the | |
483 | * result of ah. | |
484 | */ | |
943a732a | 485 | memcpy(res, _res, 3); |
60478054 JH |
486 | |
487 | return 0; | |
488 | } | |
489 | ||
cd082797 JH |
490 | bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], |
491 | const bdaddr_t *bdaddr) | |
60478054 | 492 | { |
defce9e8 | 493 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 494 | struct smp_dev *smp; |
60478054 JH |
495 | u8 hash[3]; |
496 | int err; | |
497 | ||
defce9e8 JH |
498 | if (!chan || !chan->data) |
499 | return false; | |
500 | ||
88a479d9 | 501 | smp = chan->data; |
defce9e8 | 502 | |
60478054 JH |
503 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
504 | ||
88a479d9 | 505 | err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash); |
60478054 JH |
506 | if (err) |
507 | return false; | |
508 | ||
509 | return !memcmp(bdaddr->b, hash, 3); | |
510 | } | |
511 | ||
cd082797 | 512 | int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 513 | { |
defce9e8 | 514 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 515 | struct smp_dev *smp; |
b1e2b3ae JH |
516 | int err; |
517 | ||
defce9e8 JH |
518 | if (!chan || !chan->data) |
519 | return -EOPNOTSUPP; | |
520 | ||
88a479d9 | 521 | smp = chan->data; |
defce9e8 | 522 | |
b1e2b3ae JH |
523 | get_random_bytes(&rpa->b[3], 3); |
524 | ||
525 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
526 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
527 | ||
88a479d9 | 528 | err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b); |
b1e2b3ae JH |
529 | if (err < 0) |
530 | return err; | |
531 | ||
532 | BT_DBG("RPA %pMR", rpa); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
60a27d65 MH |
537 | int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]) |
538 | { | |
539 | struct l2cap_chan *chan = hdev->smp_data; | |
540 | struct smp_dev *smp; | |
541 | int err; | |
542 | ||
543 | if (!chan || !chan->data) | |
544 | return -EOPNOTSUPP; | |
545 | ||
546 | smp = chan->data; | |
547 | ||
548 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { | |
549 | BT_DBG("Using debug keys"); | |
550 | memcpy(smp->local_pk, debug_pk, 64); | |
551 | memcpy(smp->local_sk, debug_sk, 32); | |
552 | smp->debug_key = true; | |
553 | } else { | |
554 | while (true) { | |
555 | /* Generate local key pair for Secure Connections */ | |
556 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
557 | return -EIO; | |
558 | ||
559 | /* This is unlikely, but we need to check that | |
560 | * we didn't accidentially generate a debug key. | |
561 | */ | |
562 | if (memcmp(smp->local_sk, debug_sk, 32)) | |
563 | break; | |
564 | } | |
565 | smp->debug_key = false; | |
566 | } | |
567 | ||
568 | SMP_DBG("OOB Public Key X: %32phN", smp->local_pk); | |
569 | SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32); | |
570 | SMP_DBG("OOB Private Key: %32phN", smp->local_sk); | |
571 | ||
572 | get_random_bytes(smp->local_rr, 16); | |
573 | ||
574 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk, | |
575 | smp->local_rr, 0, hash); | |
576 | if (err < 0) | |
577 | return err; | |
578 | ||
579 | memcpy(rand, smp->local_rr, 16); | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
5d88cc73 | 584 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 585 | { |
5d88cc73 | 586 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 587 | struct smp_chan *smp; |
5d88cc73 JH |
588 | struct kvec iv[2]; |
589 | struct msghdr msg; | |
eb492e01 | 590 | |
5d88cc73 JH |
591 | if (!chan) |
592 | return; | |
eb492e01 | 593 | |
5d88cc73 | 594 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 595 | |
5d88cc73 JH |
596 | iv[0].iov_base = &code; |
597 | iv[0].iov_len = 1; | |
eb492e01 | 598 | |
5d88cc73 JH |
599 | iv[1].iov_base = data; |
600 | iv[1].iov_len = len; | |
eb492e01 | 601 | |
5d88cc73 | 602 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 603 | |
17836394 | 604 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len); |
eb492e01 | 605 | |
5d88cc73 | 606 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 607 | |
b68fda68 JH |
608 | if (!chan->data) |
609 | return; | |
610 | ||
611 | smp = chan->data; | |
612 | ||
613 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 614 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
615 | } |
616 | ||
d2eb9e10 | 617 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 618 | { |
d2eb9e10 JH |
619 | if (authreq & SMP_AUTH_MITM) { |
620 | if (authreq & SMP_AUTH_SC) | |
621 | return BT_SECURITY_FIPS; | |
622 | else | |
623 | return BT_SECURITY_HIGH; | |
624 | } else { | |
2b64d153 | 625 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 626 | } |
2b64d153 BG |
627 | } |
628 | ||
629 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
630 | { | |
631 | switch (sec_level) { | |
d2eb9e10 | 632 | case BT_SECURITY_FIPS: |
2b64d153 BG |
633 | case BT_SECURITY_HIGH: |
634 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
635 | case BT_SECURITY_MEDIUM: | |
636 | return SMP_AUTH_BONDING; | |
637 | default: | |
638 | return SMP_AUTH_NONE; | |
639 | } | |
640 | } | |
641 | ||
b8e66eac | 642 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
643 | struct smp_cmd_pairing *req, |
644 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 645 | { |
5d88cc73 JH |
646 | struct l2cap_chan *chan = conn->smp; |
647 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
648 | struct hci_conn *hcon = conn->hcon; |
649 | struct hci_dev *hdev = hcon->hdev; | |
02b05bd8 | 650 | u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT; |
54790f73 | 651 | |
d7a5a11d | 652 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
7ee4ea36 MH |
653 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
654 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 655 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
656 | } else { |
657 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
658 | } |
659 | ||
d7a5a11d | 660 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
fd349c02 JH |
661 | remote_dist |= SMP_DIST_ID_KEY; |
662 | ||
d7a5a11d | 663 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
863efaf2 JH |
664 | local_dist |= SMP_DIST_ID_KEY; |
665 | ||
d7a5a11d | 666 | if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) && |
02b05bd8 JH |
667 | (authreq & SMP_AUTH_SC)) { |
668 | struct oob_data *oob_data; | |
669 | u8 bdaddr_type; | |
670 | ||
d7a5a11d | 671 | if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) { |
df8e1a4c JH |
672 | local_dist |= SMP_DIST_LINK_KEY; |
673 | remote_dist |= SMP_DIST_LINK_KEY; | |
674 | } | |
02b05bd8 JH |
675 | |
676 | if (hcon->dst_type == ADDR_LE_DEV_PUBLIC) | |
677 | bdaddr_type = BDADDR_LE_PUBLIC; | |
678 | else | |
679 | bdaddr_type = BDADDR_LE_RANDOM; | |
680 | ||
681 | oob_data = hci_find_remote_oob_data(hdev, &hcon->dst, | |
682 | bdaddr_type); | |
4775a4ea | 683 | if (oob_data && oob_data->present) { |
1a8bab4f | 684 | set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags); |
02b05bd8 | 685 | oob_flag = SMP_OOB_PRESENT; |
a29b0733 | 686 | memcpy(smp->rr, oob_data->rand256, 16); |
02b05bd8 JH |
687 | memcpy(smp->pcnf, oob_data->hash256, 16); |
688 | } | |
689 | ||
df8e1a4c JH |
690 | } else { |
691 | authreq &= ~SMP_AUTH_SC; | |
692 | } | |
693 | ||
54790f73 VCG |
694 | if (rsp == NULL) { |
695 | req->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 696 | req->oob_flag = oob_flag; |
54790f73 | 697 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
fd349c02 JH |
698 | req->init_key_dist = local_dist; |
699 | req->resp_key_dist = remote_dist; | |
0edb14de | 700 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
701 | |
702 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
703 | return; |
704 | } | |
705 | ||
706 | rsp->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 707 | rsp->oob_flag = oob_flag; |
54790f73 | 708 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
fd349c02 JH |
709 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
710 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 711 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
712 | |
713 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
714 | } |
715 | ||
3158c50c VCG |
716 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
717 | { | |
5d88cc73 JH |
718 | struct l2cap_chan *chan = conn->smp; |
719 | struct smp_chan *smp = chan->data; | |
1c1def09 | 720 | |
3158c50c | 721 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 722 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
723 | return SMP_ENC_KEY_SIZE; |
724 | ||
f7aa611a | 725 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
726 | |
727 | return 0; | |
728 | } | |
729 | ||
6f48e260 JH |
730 | static void smp_chan_destroy(struct l2cap_conn *conn) |
731 | { | |
732 | struct l2cap_chan *chan = conn->smp; | |
733 | struct smp_chan *smp = chan->data; | |
923e2414 | 734 | struct hci_conn *hcon = conn->hcon; |
6f48e260 JH |
735 | bool complete; |
736 | ||
737 | BUG_ON(!smp); | |
738 | ||
739 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 740 | |
6f48e260 | 741 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
923e2414 | 742 | mgmt_smp_complete(hcon, complete); |
6f48e260 | 743 | |
276812ec MH |
744 | kzfree(smp->csrk); |
745 | kzfree(smp->slave_csrk); | |
746 | kzfree(smp->link_key); | |
6f48e260 JH |
747 | |
748 | crypto_free_blkcipher(smp->tfm_aes); | |
407cecf6 | 749 | crypto_free_hash(smp->tfm_cmac); |
6f48e260 | 750 | |
923e2414 JH |
751 | /* Ensure that we don't leave any debug key around if debug key |
752 | * support hasn't been explicitly enabled. | |
753 | */ | |
754 | if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG && | |
d7a5a11d | 755 | !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) { |
923e2414 JH |
756 | list_del_rcu(&smp->ltk->list); |
757 | kfree_rcu(smp->ltk, rcu); | |
758 | smp->ltk = NULL; | |
759 | } | |
760 | ||
6f48e260 JH |
761 | /* If pairing failed clean up any keys we might have */ |
762 | if (!complete) { | |
763 | if (smp->ltk) { | |
970d0f1b JH |
764 | list_del_rcu(&smp->ltk->list); |
765 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
766 | } |
767 | ||
768 | if (smp->slave_ltk) { | |
970d0f1b JH |
769 | list_del_rcu(&smp->slave_ltk->list); |
770 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
771 | } |
772 | ||
773 | if (smp->remote_irk) { | |
adae20cb JH |
774 | list_del_rcu(&smp->remote_irk->list); |
775 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
776 | } |
777 | } | |
778 | ||
779 | chan->data = NULL; | |
276812ec | 780 | kzfree(smp); |
923e2414 | 781 | hci_conn_drop(hcon); |
6f48e260 JH |
782 | } |
783 | ||
84794e11 | 784 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 785 | { |
bab73cb6 | 786 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 787 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 788 | |
84794e11 | 789 | if (reason) |
4f957a76 | 790 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 791 | &reason); |
4f957a76 | 792 | |
ce39fb4e | 793 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
e1e930f5 | 794 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 795 | |
fc75cc86 | 796 | if (chan->data) |
f1c09c07 | 797 | smp_chan_destroy(conn); |
4f957a76 BG |
798 | } |
799 | ||
2b64d153 BG |
800 | #define JUST_WORKS 0x00 |
801 | #define JUST_CFM 0x01 | |
802 | #define REQ_PASSKEY 0x02 | |
803 | #define CFM_PASSKEY 0x03 | |
804 | #define REQ_OOB 0x04 | |
5e3d3d9b | 805 | #define DSP_PASSKEY 0x05 |
2b64d153 BG |
806 | #define OVERLAP 0xFF |
807 | ||
808 | static const u8 gen_method[5][5] = { | |
809 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
810 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
811 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
812 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
813 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
814 | }; | |
815 | ||
5e3d3d9b JH |
816 | static const u8 sc_method[5][5] = { |
817 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
818 | { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
819 | { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY }, | |
820 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
821 | { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
822 | }; | |
823 | ||
581370cc JH |
824 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
825 | { | |
2bcd4003 JH |
826 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
827 | * converted later to JUST_WORKS if we're initiators. | |
828 | */ | |
581370cc JH |
829 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
830 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 831 | return JUST_CFM; |
581370cc | 832 | |
5e3d3d9b JH |
833 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
834 | return sc_method[remote_io][local_io]; | |
835 | ||
581370cc JH |
836 | return gen_method[remote_io][local_io]; |
837 | } | |
838 | ||
2b64d153 BG |
839 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
840 | u8 local_io, u8 remote_io) | |
841 | { | |
842 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
843 | struct l2cap_chan *chan = conn->smp; |
844 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
845 | u32 passkey = 0; |
846 | int ret = 0; | |
847 | ||
848 | /* Initialize key for JUST WORKS */ | |
849 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 850 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
851 | |
852 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
853 | ||
2bcd4003 JH |
854 | /* If neither side wants MITM, either "just" confirm an incoming |
855 | * request or use just-works for outgoing ones. The JUST_CFM | |
856 | * will be converted to JUST_WORKS if necessary later in this | |
857 | * function. If either side has MITM look up the method from the | |
858 | * table. | |
859 | */ | |
581370cc | 860 | if (!(auth & SMP_AUTH_MITM)) |
783e0574 | 861 | smp->method = JUST_CFM; |
2b64d153 | 862 | else |
783e0574 | 863 | smp->method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 864 | |
a82505c7 | 865 | /* Don't confirm locally initiated pairing attempts */ |
783e0574 JH |
866 | if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, |
867 | &smp->flags)) | |
868 | smp->method = JUST_WORKS; | |
a82505c7 | 869 | |
02f3e254 | 870 | /* Don't bother user space with no IO capabilities */ |
783e0574 JH |
871 | if (smp->method == JUST_CFM && |
872 | hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
873 | smp->method = JUST_WORKS; | |
02f3e254 | 874 | |
2b64d153 | 875 | /* If Just Works, Continue with Zero TK */ |
783e0574 | 876 | if (smp->method == JUST_WORKS) { |
4a74d658 | 877 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
878 | return 0; |
879 | } | |
880 | ||
881 | /* Not Just Works/Confirm results in MITM Authentication */ | |
783e0574 | 882 | if (smp->method != JUST_CFM) { |
4a74d658 | 883 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
884 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
885 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
886 | } | |
2b64d153 BG |
887 | |
888 | /* If both devices have Keyoard-Display I/O, the master | |
889 | * Confirms and the slave Enters the passkey. | |
890 | */ | |
783e0574 | 891 | if (smp->method == OVERLAP) { |
40bef302 | 892 | if (hcon->role == HCI_ROLE_MASTER) |
783e0574 | 893 | smp->method = CFM_PASSKEY; |
2b64d153 | 894 | else |
783e0574 | 895 | smp->method = REQ_PASSKEY; |
2b64d153 BG |
896 | } |
897 | ||
01ad34d2 | 898 | /* Generate random passkey. */ |
783e0574 | 899 | if (smp->method == CFM_PASSKEY) { |
943a732a | 900 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
901 | get_random_bytes(&passkey, sizeof(passkey)); |
902 | passkey %= 1000000; | |
943a732a | 903 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 904 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 905 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
906 | } |
907 | ||
783e0574 | 908 | if (smp->method == REQ_PASSKEY) |
ce39fb4e | 909 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 910 | hcon->type, hcon->dst_type); |
783e0574 | 911 | else if (smp->method == JUST_CFM) |
4eb65e66 JH |
912 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
913 | hcon->type, hcon->dst_type, | |
914 | passkey, 1); | |
2b64d153 | 915 | else |
01ad34d2 | 916 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 917 | hcon->type, hcon->dst_type, |
39adbffe | 918 | passkey, 0); |
2b64d153 | 919 | |
2b64d153 BG |
920 | return ret; |
921 | } | |
922 | ||
1cc61144 | 923 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 924 | { |
8aab4757 | 925 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
926 | struct smp_cmd_pairing_confirm cp; |
927 | int ret; | |
8aab4757 VCG |
928 | |
929 | BT_DBG("conn %p", conn); | |
930 | ||
e491eaf3 | 931 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 932 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
933 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
934 | cp.confirm_val); | |
1cc61144 JH |
935 | if (ret) |
936 | return SMP_UNSPECIFIED; | |
8aab4757 | 937 | |
4a74d658 | 938 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 939 | |
8aab4757 VCG |
940 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
941 | ||
b28b4943 JH |
942 | if (conn->hcon->out) |
943 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
944 | else | |
945 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
946 | ||
1cc61144 | 947 | return 0; |
8aab4757 VCG |
948 | } |
949 | ||
861580a9 | 950 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 951 | { |
8aab4757 VCG |
952 | struct l2cap_conn *conn = smp->conn; |
953 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 954 | u8 confirm[16]; |
8aab4757 VCG |
955 | int ret; |
956 | ||
ec70f36f | 957 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 958 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
959 | |
960 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
961 | ||
e491eaf3 | 962 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 963 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 964 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
965 | if (ret) |
966 | return SMP_UNSPECIFIED; | |
8aab4757 | 967 | |
8aab4757 VCG |
968 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
969 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 970 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
971 | } |
972 | ||
973 | if (hcon->out) { | |
fe39c7b2 MH |
974 | u8 stk[16]; |
975 | __le64 rand = 0; | |
976 | __le16 ediv = 0; | |
8aab4757 | 977 | |
e491eaf3 | 978 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 979 | |
f7aa611a | 980 | memset(stk + smp->enc_key_size, 0, |
04124681 | 981 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 982 | |
861580a9 JH |
983 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
984 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
985 | |
986 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 987 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 988 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 989 | } else { |
fff3490f | 990 | u8 stk[16], auth; |
fe39c7b2 MH |
991 | __le64 rand = 0; |
992 | __le16 ediv = 0; | |
8aab4757 | 993 | |
943a732a JH |
994 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
995 | smp->prnd); | |
8aab4757 | 996 | |
e491eaf3 | 997 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 998 | |
f7aa611a | 999 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 1000 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 1001 | |
fff3490f JH |
1002 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
1003 | auth = 1; | |
1004 | else | |
1005 | auth = 0; | |
1006 | ||
7d5843b7 JH |
1007 | /* Even though there's no _SLAVE suffix this is the |
1008 | * slave STK we're adding for later lookup (the master | |
1009 | * STK never needs to be stored). | |
1010 | */ | |
ce39fb4e | 1011 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1012 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
1013 | } |
1014 | ||
861580a9 | 1015 | return 0; |
8aab4757 VCG |
1016 | } |
1017 | ||
44f1a7ab JH |
1018 | static void smp_notify_keys(struct l2cap_conn *conn) |
1019 | { | |
1020 | struct l2cap_chan *chan = conn->smp; | |
1021 | struct smp_chan *smp = chan->data; | |
1022 | struct hci_conn *hcon = conn->hcon; | |
1023 | struct hci_dev *hdev = hcon->hdev; | |
1024 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
1025 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1026 | bool persistent; | |
1027 | ||
1028 | if (smp->remote_irk) { | |
1029 | mgmt_new_irk(hdev, smp->remote_irk); | |
1030 | /* Now that user space can be considered to know the | |
1031 | * identity address track the connection based on it | |
b5ae344d | 1032 | * from now on (assuming this is an LE link). |
44f1a7ab | 1033 | */ |
b5ae344d JH |
1034 | if (hcon->type == LE_LINK) { |
1035 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1036 | hcon->dst_type = smp->remote_irk->addr_type; | |
1037 | queue_work(hdev->workqueue, &conn->id_addr_update_work); | |
1038 | } | |
44f1a7ab JH |
1039 | |
1040 | /* When receiving an indentity resolving key for | |
1041 | * a remote device that does not use a resolvable | |
1042 | * private address, just remove the key so that | |
1043 | * it is possible to use the controller white | |
1044 | * list for scanning. | |
1045 | * | |
1046 | * Userspace will have been told to not store | |
1047 | * this key at this point. So it is safe to | |
1048 | * just remove it. | |
1049 | */ | |
1050 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
adae20cb JH |
1051 | list_del_rcu(&smp->remote_irk->list); |
1052 | kfree_rcu(smp->remote_irk, rcu); | |
44f1a7ab JH |
1053 | smp->remote_irk = NULL; |
1054 | } | |
1055 | } | |
1056 | ||
b5ae344d JH |
1057 | if (hcon->type == ACL_LINK) { |
1058 | if (hcon->key_type == HCI_LK_DEBUG_COMBINATION) | |
1059 | persistent = false; | |
1060 | else | |
1061 | persistent = !test_bit(HCI_CONN_FLUSH_KEY, | |
1062 | &hcon->flags); | |
1063 | } else { | |
1064 | /* The LTKs and CSRKs should be persistent only if both sides | |
1065 | * had the bonding bit set in their authentication requests. | |
1066 | */ | |
1067 | persistent = !!((req->auth_req & rsp->auth_req) & | |
1068 | SMP_AUTH_BONDING); | |
1069 | } | |
1070 | ||
44f1a7ab JH |
1071 | |
1072 | if (smp->csrk) { | |
1073 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1074 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
1075 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
1076 | } | |
1077 | ||
1078 | if (smp->slave_csrk) { | |
1079 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1080 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
1081 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
1082 | } | |
1083 | ||
1084 | if (smp->ltk) { | |
1085 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1086 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
1087 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
1088 | } | |
1089 | ||
1090 | if (smp->slave_ltk) { | |
1091 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1092 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
1093 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
1094 | } | |
6a77083a JH |
1095 | |
1096 | if (smp->link_key) { | |
e3befab9 JH |
1097 | struct link_key *key; |
1098 | u8 type; | |
1099 | ||
1100 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1101 | type = HCI_LK_DEBUG_COMBINATION; | |
1102 | else if (hcon->sec_level == BT_SECURITY_FIPS) | |
1103 | type = HCI_LK_AUTH_COMBINATION_P256; | |
1104 | else | |
1105 | type = HCI_LK_UNAUTH_COMBINATION_P256; | |
1106 | ||
1107 | key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst, | |
1108 | smp->link_key, type, 0, &persistent); | |
1109 | if (key) { | |
1110 | mgmt_new_link_key(hdev, key, persistent); | |
1111 | ||
1112 | /* Don't keep debug keys around if the relevant | |
1113 | * flag is not set. | |
1114 | */ | |
d7a5a11d | 1115 | if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) && |
e3befab9 JH |
1116 | key->type == HCI_LK_DEBUG_COMBINATION) { |
1117 | list_del_rcu(&key->list); | |
1118 | kfree_rcu(key, rcu); | |
1119 | } | |
1120 | } | |
6a77083a JH |
1121 | } |
1122 | } | |
1123 | ||
d3e54a87 JH |
1124 | static void sc_add_ltk(struct smp_chan *smp) |
1125 | { | |
1126 | struct hci_conn *hcon = smp->conn->hcon; | |
1127 | u8 key_type, auth; | |
1128 | ||
1129 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1130 | key_type = SMP_LTK_P256_DEBUG; | |
1131 | else | |
1132 | key_type = SMP_LTK_P256; | |
1133 | ||
1134 | if (hcon->pending_sec_level == BT_SECURITY_FIPS) | |
1135 | auth = 1; | |
1136 | else | |
1137 | auth = 0; | |
1138 | ||
1139 | memset(smp->tk + smp->enc_key_size, 0, | |
1140 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); | |
1141 | ||
1142 | smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, | |
1143 | key_type, auth, smp->tk, smp->enc_key_size, | |
1144 | 0, 0); | |
1145 | } | |
1146 | ||
6a77083a JH |
1147 | static void sc_generate_link_key(struct smp_chan *smp) |
1148 | { | |
1149 | /* These constants are as specified in the core specification. | |
1150 | * In ASCII they spell out to 'tmp1' and 'lebr'. | |
1151 | */ | |
1152 | const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1153 | const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
1154 | ||
1155 | smp->link_key = kzalloc(16, GFP_KERNEL); | |
1156 | if (!smp->link_key) | |
1157 | return; | |
1158 | ||
1159 | if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) { | |
276812ec | 1160 | kzfree(smp->link_key); |
6a77083a JH |
1161 | smp->link_key = NULL; |
1162 | return; | |
1163 | } | |
1164 | ||
1165 | if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) { | |
276812ec | 1166 | kzfree(smp->link_key); |
6a77083a JH |
1167 | smp->link_key = NULL; |
1168 | return; | |
1169 | } | |
44f1a7ab JH |
1170 | } |
1171 | ||
b28b4943 JH |
1172 | static void smp_allow_key_dist(struct smp_chan *smp) |
1173 | { | |
1174 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
1175 | * will be allowed in each PDU handler to ensure we receive | |
1176 | * them in the correct order. | |
1177 | */ | |
1178 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
1179 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
1180 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
1181 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
1182 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
1183 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1184 | } | |
1185 | ||
b5ae344d JH |
1186 | static void sc_generate_ltk(struct smp_chan *smp) |
1187 | { | |
1188 | /* These constants are as specified in the core specification. | |
1189 | * In ASCII they spell out to 'tmp2' and 'brle'. | |
1190 | */ | |
1191 | const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1192 | const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 }; | |
1193 | struct hci_conn *hcon = smp->conn->hcon; | |
1194 | struct hci_dev *hdev = hcon->hdev; | |
1195 | struct link_key *key; | |
1196 | ||
1197 | key = hci_find_link_key(hdev, &hcon->dst); | |
1198 | if (!key) { | |
1199 | BT_ERR("%s No Link Key found to generate LTK", hdev->name); | |
1200 | return; | |
1201 | } | |
1202 | ||
1203 | if (key->type == HCI_LK_DEBUG_COMBINATION) | |
1204 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1205 | ||
1206 | if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk)) | |
1207 | return; | |
1208 | ||
1209 | if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk)) | |
1210 | return; | |
1211 | ||
1212 | sc_add_ltk(smp); | |
1213 | } | |
1214 | ||
d6268e86 | 1215 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
1216 | { |
1217 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 1218 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
1219 | struct hci_conn *hcon = conn->hcon; |
1220 | struct hci_dev *hdev = hcon->hdev; | |
1221 | __u8 *keydist; | |
1222 | ||
1223 | BT_DBG("conn %p", conn); | |
1224 | ||
44f1a7ab JH |
1225 | rsp = (void *) &smp->prsp[1]; |
1226 | ||
1227 | /* The responder sends its keys first */ | |
b28b4943 JH |
1228 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
1229 | smp_allow_key_dist(smp); | |
86d1407c | 1230 | return; |
b28b4943 | 1231 | } |
44f1a7ab JH |
1232 | |
1233 | req = (void *) &smp->preq[1]; | |
1234 | ||
1235 | if (hcon->out) { | |
1236 | keydist = &rsp->init_key_dist; | |
1237 | *keydist &= req->init_key_dist; | |
1238 | } else { | |
1239 | keydist = &rsp->resp_key_dist; | |
1240 | *keydist &= req->resp_key_dist; | |
1241 | } | |
1242 | ||
6a77083a | 1243 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
b5ae344d | 1244 | if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY)) |
6a77083a | 1245 | sc_generate_link_key(smp); |
b5ae344d JH |
1246 | if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY)) |
1247 | sc_generate_ltk(smp); | |
6a77083a JH |
1248 | |
1249 | /* Clear the keys which are generated but not distributed */ | |
1250 | *keydist &= ~SMP_SC_NO_DIST; | |
1251 | } | |
1252 | ||
44f1a7ab JH |
1253 | BT_DBG("keydist 0x%x", *keydist); |
1254 | ||
1255 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1256 | struct smp_cmd_encrypt_info enc; | |
1257 | struct smp_cmd_master_ident ident; | |
1258 | struct smp_ltk *ltk; | |
1259 | u8 authenticated; | |
1260 | __le16 ediv; | |
1261 | __le64 rand; | |
1262 | ||
1263 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
1264 | get_random_bytes(&ediv, sizeof(ediv)); | |
1265 | get_random_bytes(&rand, sizeof(rand)); | |
1266 | ||
1267 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1268 | ||
1269 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
1270 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
1271 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
1272 | smp->enc_key_size, ediv, rand); | |
1273 | smp->slave_ltk = ltk; | |
1274 | ||
1275 | ident.ediv = ediv; | |
1276 | ident.rand = rand; | |
1277 | ||
1278 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1279 | ||
1280 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1281 | } | |
1282 | ||
1283 | if (*keydist & SMP_DIST_ID_KEY) { | |
1284 | struct smp_cmd_ident_addr_info addrinfo; | |
1285 | struct smp_cmd_ident_info idinfo; | |
1286 | ||
1287 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
1288 | ||
1289 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1290 | ||
1291 | /* The hci_conn contains the local identity address | |
1292 | * after the connection has been established. | |
1293 | * | |
1294 | * This is true even when the connection has been | |
1295 | * established using a resolvable random address. | |
1296 | */ | |
1297 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
1298 | addrinfo.addr_type = hcon->src_type; | |
1299 | ||
1300 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1301 | &addrinfo); | |
1302 | ||
1303 | *keydist &= ~SMP_DIST_ID_KEY; | |
1304 | } | |
1305 | ||
1306 | if (*keydist & SMP_DIST_SIGN) { | |
1307 | struct smp_cmd_sign_info sign; | |
1308 | struct smp_csrk *csrk; | |
1309 | ||
1310 | /* Generate a new random key */ | |
1311 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1312 | ||
1313 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1314 | if (csrk) { | |
4cd3928a JH |
1315 | if (hcon->sec_level > BT_SECURITY_MEDIUM) |
1316 | csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED; | |
1317 | else | |
1318 | csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED; | |
44f1a7ab JH |
1319 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); |
1320 | } | |
1321 | smp->slave_csrk = csrk; | |
1322 | ||
1323 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1324 | ||
1325 | *keydist &= ~SMP_DIST_SIGN; | |
1326 | } | |
1327 | ||
1328 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
1329 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
1330 | smp_allow_key_dist(smp); | |
86d1407c | 1331 | return; |
b28b4943 | 1332 | } |
44f1a7ab | 1333 | |
44f1a7ab JH |
1334 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1335 | smp_notify_keys(conn); | |
1336 | ||
1337 | smp_chan_destroy(conn); | |
44f1a7ab JH |
1338 | } |
1339 | ||
b68fda68 JH |
1340 | static void smp_timeout(struct work_struct *work) |
1341 | { | |
1342 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
1343 | security_timer.work); | |
1344 | struct l2cap_conn *conn = smp->conn; | |
1345 | ||
1346 | BT_DBG("conn %p", conn); | |
1347 | ||
1e91c29e | 1348 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
1349 | } |
1350 | ||
8aab4757 VCG |
1351 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
1352 | { | |
5d88cc73 | 1353 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
1354 | struct smp_chan *smp; |
1355 | ||
f1560463 | 1356 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 1357 | if (!smp) |
8aab4757 VCG |
1358 | return NULL; |
1359 | ||
6a7bd103 JH |
1360 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
1361 | if (IS_ERR(smp->tfm_aes)) { | |
1362 | BT_ERR("Unable to create ECB crypto context"); | |
276812ec | 1363 | kzfree(smp); |
6a7bd103 JH |
1364 | return NULL; |
1365 | } | |
1366 | ||
407cecf6 JH |
1367 | smp->tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
1368 | if (IS_ERR(smp->tfm_cmac)) { | |
1369 | BT_ERR("Unable to create CMAC crypto context"); | |
1370 | crypto_free_blkcipher(smp->tfm_aes); | |
276812ec | 1371 | kzfree(smp); |
407cecf6 JH |
1372 | return NULL; |
1373 | } | |
1374 | ||
8aab4757 | 1375 | smp->conn = conn; |
5d88cc73 | 1376 | chan->data = smp; |
8aab4757 | 1377 | |
b28b4943 JH |
1378 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
1379 | ||
b68fda68 JH |
1380 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
1381 | ||
8aab4757 VCG |
1382 | hci_conn_hold(conn->hcon); |
1383 | ||
1384 | return smp; | |
1385 | } | |
1386 | ||
760b018b JH |
1387 | static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16]) |
1388 | { | |
1389 | struct hci_conn *hcon = smp->conn->hcon; | |
1390 | u8 *na, *nb, a[7], b[7]; | |
1391 | ||
1392 | if (hcon->out) { | |
1393 | na = smp->prnd; | |
1394 | nb = smp->rrnd; | |
1395 | } else { | |
1396 | na = smp->rrnd; | |
1397 | nb = smp->prnd; | |
1398 | } | |
1399 | ||
1400 | memcpy(a, &hcon->init_addr, 6); | |
1401 | memcpy(b, &hcon->resp_addr, 6); | |
1402 | a[6] = hcon->init_addr_type; | |
1403 | b[6] = hcon->resp_addr_type; | |
1404 | ||
1405 | return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk); | |
1406 | } | |
1407 | ||
38606f14 | 1408 | static void sc_dhkey_check(struct smp_chan *smp) |
760b018b JH |
1409 | { |
1410 | struct hci_conn *hcon = smp->conn->hcon; | |
1411 | struct smp_cmd_dhkey_check check; | |
1412 | u8 a[7], b[7], *local_addr, *remote_addr; | |
1413 | u8 io_cap[3], r[16]; | |
1414 | ||
760b018b JH |
1415 | memcpy(a, &hcon->init_addr, 6); |
1416 | memcpy(b, &hcon->resp_addr, 6); | |
1417 | a[6] = hcon->init_addr_type; | |
1418 | b[6] = hcon->resp_addr_type; | |
1419 | ||
1420 | if (hcon->out) { | |
1421 | local_addr = a; | |
1422 | remote_addr = b; | |
1423 | memcpy(io_cap, &smp->preq[1], 3); | |
1424 | } else { | |
1425 | local_addr = b; | |
1426 | remote_addr = a; | |
1427 | memcpy(io_cap, &smp->prsp[1], 3); | |
1428 | } | |
1429 | ||
dddd3059 JH |
1430 | memset(r, 0, sizeof(r)); |
1431 | ||
1432 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
38606f14 | 1433 | put_unaligned_le32(hcon->passkey_notify, r); |
760b018b | 1434 | |
a29b0733 JH |
1435 | if (smp->method == REQ_OOB) |
1436 | memcpy(r, smp->rr, 16); | |
1437 | ||
760b018b JH |
1438 | smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap, |
1439 | local_addr, remote_addr, check.e); | |
1440 | ||
1441 | smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check); | |
dddd3059 JH |
1442 | } |
1443 | ||
38606f14 JH |
1444 | static u8 sc_passkey_send_confirm(struct smp_chan *smp) |
1445 | { | |
1446 | struct l2cap_conn *conn = smp->conn; | |
1447 | struct hci_conn *hcon = conn->hcon; | |
1448 | struct smp_cmd_pairing_confirm cfm; | |
1449 | u8 r; | |
1450 | ||
1451 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1452 | r |= 0x80; | |
1453 | ||
1454 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); | |
1455 | ||
1456 | if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r, | |
1457 | cfm.confirm_val)) | |
1458 | return SMP_UNSPECIFIED; | |
1459 | ||
1460 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op) | |
1466 | { | |
1467 | struct l2cap_conn *conn = smp->conn; | |
1468 | struct hci_conn *hcon = conn->hcon; | |
1469 | struct hci_dev *hdev = hcon->hdev; | |
1470 | u8 cfm[16], r; | |
1471 | ||
1472 | /* Ignore the PDU if we've already done 20 rounds (0 - 19) */ | |
1473 | if (smp->passkey_round >= 20) | |
1474 | return 0; | |
1475 | ||
1476 | switch (smp_op) { | |
1477 | case SMP_CMD_PAIRING_RANDOM: | |
1478 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1479 | r |= 0x80; | |
1480 | ||
1481 | if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1482 | smp->rrnd, r, cfm)) | |
1483 | return SMP_UNSPECIFIED; | |
1484 | ||
1485 | if (memcmp(smp->pcnf, cfm, 16)) | |
1486 | return SMP_CONFIRM_FAILED; | |
1487 | ||
1488 | smp->passkey_round++; | |
1489 | ||
1490 | if (smp->passkey_round == 20) { | |
1491 | /* Generate MacKey and LTK */ | |
1492 | if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk)) | |
1493 | return SMP_UNSPECIFIED; | |
1494 | } | |
1495 | ||
1496 | /* The round is only complete when the initiator | |
1497 | * receives pairing random. | |
1498 | */ | |
1499 | if (!hcon->out) { | |
1500 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1501 | sizeof(smp->prnd), smp->prnd); | |
d3e54a87 | 1502 | if (smp->passkey_round == 20) |
38606f14 | 1503 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
d3e54a87 | 1504 | else |
38606f14 | 1505 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
38606f14 JH |
1506 | return 0; |
1507 | } | |
1508 | ||
1509 | /* Start the next round */ | |
1510 | if (smp->passkey_round != 20) | |
1511 | return sc_passkey_round(smp, 0); | |
1512 | ||
1513 | /* Passkey rounds are complete - start DHKey Check */ | |
1514 | sc_dhkey_check(smp); | |
1515 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1516 | ||
1517 | break; | |
1518 | ||
1519 | case SMP_CMD_PAIRING_CONFIRM: | |
1520 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
1521 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1526 | ||
1527 | if (hcon->out) { | |
1528 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1529 | sizeof(smp->prnd), smp->prnd); | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | return sc_passkey_send_confirm(smp); | |
1534 | ||
1535 | case SMP_CMD_PUBLIC_KEY: | |
1536 | default: | |
1537 | /* Initiating device starts the round */ | |
1538 | if (!hcon->out) | |
1539 | return 0; | |
1540 | ||
1541 | BT_DBG("%s Starting passkey round %u", hdev->name, | |
1542 | smp->passkey_round + 1); | |
1543 | ||
1544 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1545 | ||
1546 | return sc_passkey_send_confirm(smp); | |
1547 | } | |
1548 | ||
1549 | return 0; | |
1550 | } | |
1551 | ||
dddd3059 JH |
1552 | static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey) |
1553 | { | |
38606f14 JH |
1554 | struct l2cap_conn *conn = smp->conn; |
1555 | struct hci_conn *hcon = conn->hcon; | |
1556 | u8 smp_op; | |
1557 | ||
1558 | clear_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
1559 | ||
dddd3059 JH |
1560 | switch (mgmt_op) { |
1561 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1562 | smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED); | |
1563 | return 0; | |
1564 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
1565 | smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED); | |
1566 | return 0; | |
38606f14 JH |
1567 | case MGMT_OP_USER_PASSKEY_REPLY: |
1568 | hcon->passkey_notify = le32_to_cpu(passkey); | |
1569 | smp->passkey_round = 0; | |
1570 | ||
1571 | if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) | |
1572 | smp_op = SMP_CMD_PAIRING_CONFIRM; | |
1573 | else | |
1574 | smp_op = 0; | |
1575 | ||
1576 | if (sc_passkey_round(smp, smp_op)) | |
1577 | return -EIO; | |
1578 | ||
1579 | return 0; | |
dddd3059 JH |
1580 | } |
1581 | ||
d3e54a87 JH |
1582 | /* Initiator sends DHKey check first */ |
1583 | if (hcon->out) { | |
1584 | sc_dhkey_check(smp); | |
1585 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1586 | } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) { | |
1587 | sc_dhkey_check(smp); | |
1588 | sc_add_ltk(smp); | |
1589 | } | |
760b018b JH |
1590 | |
1591 | return 0; | |
1592 | } | |
1593 | ||
2b64d153 BG |
1594 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
1595 | { | |
b10e8017 | 1596 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 1597 | struct l2cap_chan *chan; |
2b64d153 BG |
1598 | struct smp_chan *smp; |
1599 | u32 value; | |
fc75cc86 | 1600 | int err; |
2b64d153 BG |
1601 | |
1602 | BT_DBG(""); | |
1603 | ||
fc75cc86 | 1604 | if (!conn) |
2b64d153 BG |
1605 | return -ENOTCONN; |
1606 | ||
5d88cc73 JH |
1607 | chan = conn->smp; |
1608 | if (!chan) | |
1609 | return -ENOTCONN; | |
1610 | ||
fc75cc86 JH |
1611 | l2cap_chan_lock(chan); |
1612 | if (!chan->data) { | |
1613 | err = -ENOTCONN; | |
1614 | goto unlock; | |
1615 | } | |
1616 | ||
5d88cc73 | 1617 | smp = chan->data; |
2b64d153 | 1618 | |
760b018b JH |
1619 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1620 | err = sc_user_reply(smp, mgmt_op, passkey); | |
1621 | goto unlock; | |
1622 | } | |
1623 | ||
2b64d153 BG |
1624 | switch (mgmt_op) { |
1625 | case MGMT_OP_USER_PASSKEY_REPLY: | |
1626 | value = le32_to_cpu(passkey); | |
943a732a | 1627 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 1628 | BT_DBG("PassKey: %d", value); |
943a732a | 1629 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
1630 | /* Fall Through */ |
1631 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 1632 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
1633 | break; |
1634 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1635 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 1636 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1637 | err = 0; |
1638 | goto unlock; | |
2b64d153 | 1639 | default: |
84794e11 | 1640 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1641 | err = -EOPNOTSUPP; |
1642 | goto unlock; | |
2b64d153 BG |
1643 | } |
1644 | ||
fc75cc86 JH |
1645 | err = 0; |
1646 | ||
2b64d153 | 1647 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
1648 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
1649 | u8 rsp = smp_confirm(smp); | |
1650 | if (rsp) | |
1651 | smp_failure(conn, rsp); | |
1652 | } | |
2b64d153 | 1653 | |
fc75cc86 JH |
1654 | unlock: |
1655 | l2cap_chan_unlock(chan); | |
1656 | return err; | |
2b64d153 BG |
1657 | } |
1658 | ||
b5ae344d JH |
1659 | static void build_bredr_pairing_cmd(struct smp_chan *smp, |
1660 | struct smp_cmd_pairing *req, | |
1661 | struct smp_cmd_pairing *rsp) | |
1662 | { | |
1663 | struct l2cap_conn *conn = smp->conn; | |
1664 | struct hci_dev *hdev = conn->hcon->hdev; | |
1665 | u8 local_dist = 0, remote_dist = 0; | |
1666 | ||
d7a5a11d | 1667 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
b5ae344d JH |
1668 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
1669 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1670 | } | |
1671 | ||
d7a5a11d | 1672 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
b5ae344d JH |
1673 | remote_dist |= SMP_DIST_ID_KEY; |
1674 | ||
d7a5a11d | 1675 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
b5ae344d JH |
1676 | local_dist |= SMP_DIST_ID_KEY; |
1677 | ||
1678 | if (!rsp) { | |
1679 | memset(req, 0, sizeof(*req)); | |
1680 | ||
1681 | req->init_key_dist = local_dist; | |
1682 | req->resp_key_dist = remote_dist; | |
1683 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
1684 | ||
1685 | smp->remote_key_dist = remote_dist; | |
1686 | ||
1687 | return; | |
1688 | } | |
1689 | ||
1690 | memset(rsp, 0, sizeof(*rsp)); | |
1691 | ||
1692 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
1693 | rsp->init_key_dist = req->init_key_dist & remote_dist; | |
1694 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
1695 | ||
1696 | smp->remote_key_dist = rsp->init_key_dist; | |
1697 | } | |
1698 | ||
da85e5e5 | 1699 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1700 | { |
3158c50c | 1701 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 1702 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 1703 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 1704 | struct smp_chan *smp; |
c7262e71 | 1705 | u8 key_size, auth, sec_level; |
8aab4757 | 1706 | int ret; |
88ba43b6 AB |
1707 | |
1708 | BT_DBG("conn %p", conn); | |
1709 | ||
c46b98be | 1710 | if (skb->len < sizeof(*req)) |
38e4a915 | 1711 | return SMP_INVALID_PARAMS; |
c46b98be | 1712 | |
40bef302 | 1713 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
1714 | return SMP_CMD_NOTSUPP; |
1715 | ||
fc75cc86 | 1716 | if (!chan->data) |
8aab4757 | 1717 | smp = smp_chan_create(conn); |
fc75cc86 | 1718 | else |
5d88cc73 | 1719 | smp = chan->data; |
8aab4757 | 1720 | |
d08fd0e7 AE |
1721 | if (!smp) |
1722 | return SMP_UNSPECIFIED; | |
d26a2345 | 1723 | |
c05b9339 | 1724 | /* We didn't start the pairing, so match remote */ |
0edb14de | 1725 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1726 | |
d7a5a11d | 1727 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 1728 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
1729 | return SMP_PAIRING_NOTSUPP; |
1730 | ||
d7a5a11d | 1731 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1732 | return SMP_AUTH_REQUIREMENTS; |
1733 | ||
1c1def09 VCG |
1734 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1735 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 1736 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 1737 | |
cb06d366 JH |
1738 | /* If the remote side's OOB flag is set it means it has |
1739 | * successfully received our local OOB data - therefore set the | |
1740 | * flag to indicate that local OOB is in use. | |
1741 | */ | |
58428563 JH |
1742 | if (req->oob_flag == SMP_OOB_PRESENT) |
1743 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1744 | ||
b5ae344d JH |
1745 | /* SMP over BR/EDR requires special treatment */ |
1746 | if (conn->hcon->type == ACL_LINK) { | |
1747 | /* We must have a BR/EDR SC link */ | |
08f63cc5 | 1748 | if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) && |
b7cb93e5 | 1749 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
1750 | return SMP_CROSS_TRANSP_NOT_ALLOWED; |
1751 | ||
1752 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1753 | ||
1754 | build_bredr_pairing_cmd(smp, req, &rsp); | |
1755 | ||
1756 | key_size = min(req->max_key_size, rsp.max_key_size); | |
1757 | if (check_enc_key_size(conn, key_size)) | |
1758 | return SMP_ENC_KEY_SIZE; | |
1759 | ||
1760 | /* Clear bits which are generated but not distributed */ | |
1761 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1762 | ||
1763 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; | |
1764 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
1765 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); | |
1766 | ||
1767 | smp_distribute_keys(smp); | |
1768 | return 0; | |
1769 | } | |
1770 | ||
5e3d3d9b JH |
1771 | build_pairing_cmd(conn, req, &rsp, auth); |
1772 | ||
1773 | if (rsp.auth_req & SMP_AUTH_SC) | |
1774 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1775 | ||
5be5e275 | 1776 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1777 | sec_level = BT_SECURITY_MEDIUM; |
1778 | else | |
1779 | sec_level = authreq_to_seclevel(auth); | |
1780 | ||
c7262e71 JH |
1781 | if (sec_level > conn->hcon->pending_sec_level) |
1782 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1783 | |
49c922bb | 1784 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1785 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1786 | u8 method; | |
1787 | ||
1788 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1789 | req->io_capability); | |
1790 | if (method == JUST_WORKS || method == JUST_CFM) | |
1791 | return SMP_AUTH_REQUIREMENTS; | |
1792 | } | |
1793 | ||
3158c50c VCG |
1794 | key_size = min(req->max_key_size, rsp.max_key_size); |
1795 | if (check_enc_key_size(conn, key_size)) | |
1796 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1797 | |
e84a6b13 | 1798 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1799 | |
1c1def09 VCG |
1800 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1801 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1802 | |
3158c50c | 1803 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1804 | |
1805 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1806 | ||
1807 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { | |
1808 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1809 | /* Clear bits which are generated but not distributed */ | |
1810 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1811 | /* Wait for Public Key from Initiating Device */ | |
1812 | return 0; | |
3b19146d | 1813 | } |
da85e5e5 | 1814 | |
983f9814 MH |
1815 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
1816 | ||
2b64d153 BG |
1817 | /* Request setup of TK */ |
1818 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1819 | if (ret) | |
1820 | return SMP_UNSPECIFIED; | |
1821 | ||
da85e5e5 | 1822 | return 0; |
88ba43b6 AB |
1823 | } |
1824 | ||
3b19146d JH |
1825 | static u8 sc_send_public_key(struct smp_chan *smp) |
1826 | { | |
70157ef5 JH |
1827 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
1828 | ||
3b19146d JH |
1829 | BT_DBG(""); |
1830 | ||
1a8bab4f | 1831 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { |
33d0c030 MH |
1832 | struct l2cap_chan *chan = hdev->smp_data; |
1833 | struct smp_dev *smp_dev; | |
1834 | ||
1835 | if (!chan || !chan->data) | |
1836 | return SMP_UNSPECIFIED; | |
1837 | ||
1838 | smp_dev = chan->data; | |
1839 | ||
1840 | memcpy(smp->local_pk, smp_dev->local_pk, 64); | |
1841 | memcpy(smp->local_sk, smp_dev->local_sk, 32); | |
882fafad | 1842 | memcpy(smp->lr, smp_dev->local_rr, 16); |
33d0c030 MH |
1843 | |
1844 | if (smp_dev->debug_key) | |
1845 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1846 | ||
1847 | goto done; | |
1848 | } | |
1849 | ||
d7a5a11d | 1850 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { |
70157ef5 JH |
1851 | BT_DBG("Using debug keys"); |
1852 | memcpy(smp->local_pk, debug_pk, 64); | |
1853 | memcpy(smp->local_sk, debug_sk, 32); | |
1854 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1855 | } else { | |
1856 | while (true) { | |
1857 | /* Generate local key pair for Secure Connections */ | |
1858 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
1859 | return SMP_UNSPECIFIED; | |
6c0dcc50 | 1860 | |
70157ef5 JH |
1861 | /* This is unlikely, but we need to check that |
1862 | * we didn't accidentially generate a debug key. | |
1863 | */ | |
1864 | if (memcmp(smp->local_sk, debug_sk, 32)) | |
1865 | break; | |
1866 | } | |
6c0dcc50 | 1867 | } |
3b19146d | 1868 | |
33d0c030 | 1869 | done: |
c7a3d57d | 1870 | SMP_DBG("Local Public Key X: %32phN", smp->local_pk); |
8e4e2ee5 | 1871 | SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32); |
c7a3d57d | 1872 | SMP_DBG("Local Private Key: %32phN", smp->local_sk); |
3b19146d JH |
1873 | |
1874 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1875 | ||
1876 | return 0; | |
1877 | } | |
1878 | ||
da85e5e5 | 1879 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1880 | { |
3158c50c | 1881 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1882 | struct l2cap_chan *chan = conn->smp; |
1883 | struct smp_chan *smp = chan->data; | |
0edb14de | 1884 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1885 | u8 key_size, auth; |
7d24ddcc | 1886 | int ret; |
88ba43b6 AB |
1887 | |
1888 | BT_DBG("conn %p", conn); | |
1889 | ||
c46b98be | 1890 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1891 | return SMP_INVALID_PARAMS; |
c46b98be | 1892 | |
40bef302 | 1893 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1894 | return SMP_CMD_NOTSUPP; |
1895 | ||
3158c50c VCG |
1896 | skb_pull(skb, sizeof(*rsp)); |
1897 | ||
1c1def09 | 1898 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1899 | |
3158c50c VCG |
1900 | key_size = min(req->max_key_size, rsp->max_key_size); |
1901 | if (check_enc_key_size(conn, key_size)) | |
1902 | return SMP_ENC_KEY_SIZE; | |
1903 | ||
0edb14de | 1904 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1905 | |
d7a5a11d | 1906 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1907 | return SMP_AUTH_REQUIREMENTS; |
1908 | ||
cb06d366 JH |
1909 | /* If the remote side's OOB flag is set it means it has |
1910 | * successfully received our local OOB data - therefore set the | |
1911 | * flag to indicate that local OOB is in use. | |
1912 | */ | |
58428563 JH |
1913 | if (rsp->oob_flag == SMP_OOB_PRESENT) |
1914 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1915 | ||
b5ae344d JH |
1916 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1917 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
1918 | ||
1919 | /* Update remote key distribution in case the remote cleared | |
1920 | * some bits that we had enabled in our request. | |
1921 | */ | |
1922 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1923 | ||
1924 | /* For BR/EDR this means we're done and can start phase 3 */ | |
1925 | if (conn->hcon->type == ACL_LINK) { | |
1926 | /* Clear bits which are generated but not distributed */ | |
1927 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1928 | smp_distribute_keys(smp); | |
1929 | return 0; | |
1930 | } | |
1931 | ||
65668776 JH |
1932 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1933 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1934 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1935 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1936 | |
49c922bb | 1937 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1938 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1939 | u8 method; | |
1940 | ||
1941 | method = get_auth_method(smp, req->io_capability, | |
1942 | rsp->io_capability); | |
1943 | if (method == JUST_WORKS || method == JUST_CFM) | |
1944 | return SMP_AUTH_REQUIREMENTS; | |
1945 | } | |
1946 | ||
e84a6b13 | 1947 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1948 | |
fdcc4bec JH |
1949 | /* Update remote key distribution in case the remote cleared |
1950 | * some bits that we had enabled in our request. | |
1951 | */ | |
1952 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1953 | ||
3b19146d JH |
1954 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1955 | /* Clear bits which are generated but not distributed */ | |
1956 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1957 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1958 | return sc_send_public_key(smp); | |
1959 | } | |
1960 | ||
c05b9339 | 1961 | auth |= req->auth_req; |
2b64d153 | 1962 | |
476585ec | 1963 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1964 | if (ret) |
1965 | return SMP_UNSPECIFIED; | |
1966 | ||
4a74d658 | 1967 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1968 | |
1969 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1970 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1971 | return smp_confirm(smp); |
da85e5e5 VCG |
1972 | |
1973 | return 0; | |
88ba43b6 AB |
1974 | } |
1975 | ||
dcee2b32 JH |
1976 | static u8 sc_check_confirm(struct smp_chan *smp) |
1977 | { | |
1978 | struct l2cap_conn *conn = smp->conn; | |
1979 | ||
1980 | BT_DBG(""); | |
1981 | ||
1982 | /* Public Key exchange must happen before any other steps */ | |
1983 | if (!test_bit(SMP_FLAG_REMOTE_PK, &smp->flags)) | |
1984 | return SMP_UNSPECIFIED; | |
1985 | ||
38606f14 JH |
1986 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
1987 | return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM); | |
1988 | ||
dcee2b32 JH |
1989 | if (conn->hcon->out) { |
1990 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1991 | smp->prnd); | |
1992 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1993 | } | |
1994 | ||
1995 | return 0; | |
1996 | } | |
1997 | ||
da85e5e5 | 1998 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1999 | { |
5d88cc73 JH |
2000 | struct l2cap_chan *chan = conn->smp; |
2001 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 2002 | |
88ba43b6 AB |
2003 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
2004 | ||
c46b98be | 2005 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 2006 | return SMP_INVALID_PARAMS; |
c46b98be | 2007 | |
1c1def09 VCG |
2008 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
2009 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 2010 | |
dcee2b32 JH |
2011 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
2012 | return sc_check_confirm(smp); | |
2013 | ||
b28b4943 | 2014 | if (conn->hcon->out) { |
943a732a JH |
2015 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
2016 | smp->prnd); | |
b28b4943 JH |
2017 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
2018 | return 0; | |
2019 | } | |
2020 | ||
2021 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 2022 | return smp_confirm(smp); |
983f9814 MH |
2023 | |
2024 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
da85e5e5 VCG |
2025 | |
2026 | return 0; | |
88ba43b6 AB |
2027 | } |
2028 | ||
da85e5e5 | 2029 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2030 | { |
5d88cc73 JH |
2031 | struct l2cap_chan *chan = conn->smp; |
2032 | struct smp_chan *smp = chan->data; | |
191dc7fe JH |
2033 | struct hci_conn *hcon = conn->hcon; |
2034 | u8 *pkax, *pkbx, *na, *nb; | |
2035 | u32 passkey; | |
2036 | int err; | |
7d24ddcc | 2037 | |
8aab4757 | 2038 | BT_DBG("conn %p", conn); |
3158c50c | 2039 | |
c46b98be | 2040 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 2041 | return SMP_INVALID_PARAMS; |
c46b98be | 2042 | |
943a732a | 2043 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 2044 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 2045 | |
191dc7fe JH |
2046 | if (!test_bit(SMP_FLAG_SC, &smp->flags)) |
2047 | return smp_random(smp); | |
2048 | ||
580039e8 JH |
2049 | if (hcon->out) { |
2050 | pkax = smp->local_pk; | |
2051 | pkbx = smp->remote_pk; | |
2052 | na = smp->prnd; | |
2053 | nb = smp->rrnd; | |
2054 | } else { | |
2055 | pkax = smp->remote_pk; | |
2056 | pkbx = smp->local_pk; | |
2057 | na = smp->rrnd; | |
2058 | nb = smp->prnd; | |
2059 | } | |
2060 | ||
a29b0733 JH |
2061 | if (smp->method == REQ_OOB) { |
2062 | if (!hcon->out) | |
2063 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2064 | sizeof(smp->prnd), smp->prnd); | |
2065 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
2066 | goto mackey_and_ltk; | |
2067 | } | |
2068 | ||
38606f14 JH |
2069 | /* Passkey entry has special treatment */ |
2070 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
2071 | return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM); | |
2072 | ||
191dc7fe JH |
2073 | if (hcon->out) { |
2074 | u8 cfm[16]; | |
2075 | ||
2076 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
2077 | smp->rrnd, 0, cfm); | |
2078 | if (err) | |
2079 | return SMP_UNSPECIFIED; | |
2080 | ||
2081 | if (memcmp(smp->pcnf, cfm, 16)) | |
2082 | return SMP_CONFIRM_FAILED; | |
191dc7fe JH |
2083 | } else { |
2084 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2085 | smp->prnd); | |
2086 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
191dc7fe JH |
2087 | } |
2088 | ||
a29b0733 | 2089 | mackey_and_ltk: |
760b018b JH |
2090 | /* Generate MacKey and LTK */ |
2091 | err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk); | |
2092 | if (err) | |
2093 | return SMP_UNSPECIFIED; | |
2094 | ||
a29b0733 | 2095 | if (smp->method == JUST_WORKS || smp->method == REQ_OOB) { |
dddd3059 | 2096 | if (hcon->out) { |
38606f14 | 2097 | sc_dhkey_check(smp); |
dddd3059 JH |
2098 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
2099 | } | |
2100 | return 0; | |
2101 | } | |
2102 | ||
38606f14 JH |
2103 | err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey); |
2104 | if (err) | |
2105 | return SMP_UNSPECIFIED; | |
2106 | ||
2107 | err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type, | |
2108 | hcon->dst_type, passkey, 0); | |
191dc7fe JH |
2109 | if (err) |
2110 | return SMP_UNSPECIFIED; | |
2111 | ||
38606f14 JH |
2112 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2113 | ||
191dc7fe | 2114 | return 0; |
88ba43b6 AB |
2115 | } |
2116 | ||
f81cd823 | 2117 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 2118 | { |
c9839a11 | 2119 | struct smp_ltk *key; |
988c5997 VCG |
2120 | struct hci_conn *hcon = conn->hcon; |
2121 | ||
f3a73d97 | 2122 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 2123 | if (!key) |
f81cd823 | 2124 | return false; |
988c5997 | 2125 | |
a6f7833c | 2126 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 2127 | return false; |
4dab7864 | 2128 | |
51a8efd7 | 2129 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 2130 | return true; |
988c5997 | 2131 | |
c9839a11 VCG |
2132 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
2133 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 2134 | |
fe59a05f JH |
2135 | /* We never store STKs for master role, so clear this flag */ |
2136 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
2137 | ||
f81cd823 | 2138 | return true; |
988c5997 | 2139 | } |
f1560463 | 2140 | |
35dc6f83 JH |
2141 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
2142 | enum smp_key_pref key_pref) | |
854f4727 JH |
2143 | { |
2144 | if (sec_level == BT_SECURITY_LOW) | |
2145 | return true; | |
2146 | ||
35dc6f83 JH |
2147 | /* If we're encrypted with an STK but the caller prefers using |
2148 | * LTK claim insufficient security. This way we allow the | |
2149 | * connection to be re-encrypted with an LTK, even if the LTK | |
2150 | * provides the same level of security. Only exception is if we | |
2151 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 2152 | */ |
35dc6f83 JH |
2153 | if (key_pref == SMP_USE_LTK && |
2154 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 2155 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
2156 | return false; |
2157 | ||
854f4727 JH |
2158 | if (hcon->sec_level >= sec_level) |
2159 | return true; | |
2160 | ||
2161 | return false; | |
2162 | } | |
2163 | ||
da85e5e5 | 2164 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
2165 | { |
2166 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
2167 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 2168 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 2169 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 2170 | struct smp_chan *smp; |
c05b9339 | 2171 | u8 sec_level, auth; |
88ba43b6 AB |
2172 | |
2173 | BT_DBG("conn %p", conn); | |
2174 | ||
c46b98be | 2175 | if (skb->len < sizeof(*rp)) |
38e4a915 | 2176 | return SMP_INVALID_PARAMS; |
c46b98be | 2177 | |
40bef302 | 2178 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
2179 | return SMP_CMD_NOTSUPP; |
2180 | ||
0edb14de | 2181 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 2182 | |
d7a5a11d | 2183 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
2184 | return SMP_AUTH_REQUIREMENTS; |
2185 | ||
5be5e275 | 2186 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
2187 | sec_level = BT_SECURITY_MEDIUM; |
2188 | else | |
2189 | sec_level = authreq_to_seclevel(auth); | |
2190 | ||
35dc6f83 | 2191 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
854f4727 JH |
2192 | return 0; |
2193 | ||
c7262e71 JH |
2194 | if (sec_level > hcon->pending_sec_level) |
2195 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 2196 | |
4dab7864 | 2197 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
2198 | return 0; |
2199 | ||
8aab4757 | 2200 | smp = smp_chan_create(conn); |
c29d2444 JH |
2201 | if (!smp) |
2202 | return SMP_UNSPECIFIED; | |
d26a2345 | 2203 | |
d7a5a11d | 2204 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 2205 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
2206 | return SMP_PAIRING_NOTSUPP; |
2207 | ||
88ba43b6 | 2208 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 2209 | |
da85e5e5 | 2210 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 2211 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 2212 | |
1c1def09 VCG |
2213 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2214 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2215 | |
88ba43b6 | 2216 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2217 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 2218 | |
da85e5e5 | 2219 | return 0; |
88ba43b6 AB |
2220 | } |
2221 | ||
cc110922 | 2222 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 2223 | { |
cc110922 | 2224 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 2225 | struct l2cap_chan *chan; |
0a66cf20 | 2226 | struct smp_chan *smp; |
2b64d153 | 2227 | __u8 authreq; |
fc75cc86 | 2228 | int ret; |
eb492e01 | 2229 | |
3a0259bb VCG |
2230 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
2231 | ||
0a66cf20 JH |
2232 | /* This may be NULL if there's an unexpected disconnection */ |
2233 | if (!conn) | |
2234 | return 1; | |
2235 | ||
c68b7f12 JH |
2236 | chan = conn->smp; |
2237 | ||
d7a5a11d | 2238 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) |
2e65c9d2 AG |
2239 | return 1; |
2240 | ||
35dc6f83 | 2241 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 2242 | return 1; |
f1cb9af5 | 2243 | |
c7262e71 JH |
2244 | if (sec_level > hcon->pending_sec_level) |
2245 | hcon->pending_sec_level = sec_level; | |
2246 | ||
40bef302 | 2247 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
2248 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
2249 | return 0; | |
d26a2345 | 2250 | |
fc75cc86 JH |
2251 | l2cap_chan_lock(chan); |
2252 | ||
2253 | /* If SMP is already in progress ignore this request */ | |
2254 | if (chan->data) { | |
2255 | ret = 0; | |
2256 | goto unlock; | |
2257 | } | |
d26a2345 | 2258 | |
8aab4757 | 2259 | smp = smp_chan_create(conn); |
fc75cc86 JH |
2260 | if (!smp) { |
2261 | ret = 1; | |
2262 | goto unlock; | |
2263 | } | |
2b64d153 BG |
2264 | |
2265 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 2266 | |
d7a5a11d | 2267 | if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) |
d2eb9e10 JH |
2268 | authreq |= SMP_AUTH_SC; |
2269 | ||
79897d20 JH |
2270 | /* Require MITM if IO Capability allows or the security level |
2271 | * requires it. | |
2e233644 | 2272 | */ |
79897d20 | 2273 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 2274 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
2275 | authreq |= SMP_AUTH_MITM; |
2276 | ||
40bef302 | 2277 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 2278 | struct smp_cmd_pairing cp; |
f01ead31 | 2279 | |
2b64d153 | 2280 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
2281 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2282 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2283 | |
eb492e01 | 2284 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2285 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
2286 | } else { |
2287 | struct smp_cmd_security_req cp; | |
2b64d153 | 2288 | cp.auth_req = authreq; |
eb492e01 | 2289 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 2290 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
2291 | } |
2292 | ||
4a74d658 | 2293 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 2294 | ret = 0; |
edca792c | 2295 | |
fc75cc86 JH |
2296 | unlock: |
2297 | l2cap_chan_unlock(chan); | |
2298 | return ret; | |
eb492e01 AB |
2299 | } |
2300 | ||
7034b911 VCG |
2301 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2302 | { | |
16b90839 | 2303 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
2304 | struct l2cap_chan *chan = conn->smp; |
2305 | struct smp_chan *smp = chan->data; | |
16b90839 | 2306 | |
c46b98be JH |
2307 | BT_DBG("conn %p", conn); |
2308 | ||
2309 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2310 | return SMP_INVALID_PARAMS; |
c46b98be | 2311 | |
b28b4943 | 2312 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 2313 | |
16b90839 VCG |
2314 | skb_pull(skb, sizeof(*rp)); |
2315 | ||
1c1def09 | 2316 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 2317 | |
7034b911 VCG |
2318 | return 0; |
2319 | } | |
2320 | ||
2321 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
2322 | { | |
16b90839 | 2323 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
2324 | struct l2cap_chan *chan = conn->smp; |
2325 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
2326 | struct hci_dev *hdev = conn->hcon->hdev; |
2327 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 2328 | struct smp_ltk *ltk; |
c9839a11 | 2329 | u8 authenticated; |
16b90839 | 2330 | |
c46b98be JH |
2331 | BT_DBG("conn %p", conn); |
2332 | ||
2333 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2334 | return SMP_INVALID_PARAMS; |
c46b98be | 2335 | |
9747a9f3 JH |
2336 | /* Mark the information as received */ |
2337 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
2338 | ||
b28b4943 JH |
2339 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
2340 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
2341 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
2342 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 2343 | |
16b90839 | 2344 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 2345 | |
ce39fb4e | 2346 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 2347 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
2348 | authenticated, smp->tk, smp->enc_key_size, |
2349 | rp->ediv, rp->rand); | |
2350 | smp->ltk = ltk; | |
c6e81e9a | 2351 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 2352 | smp_distribute_keys(smp); |
7034b911 VCG |
2353 | |
2354 | return 0; | |
2355 | } | |
2356 | ||
fd349c02 JH |
2357 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2358 | { | |
2359 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
2360 | struct l2cap_chan *chan = conn->smp; |
2361 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2362 | |
2363 | BT_DBG(""); | |
2364 | ||
2365 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2366 | return SMP_INVALID_PARAMS; |
fd349c02 | 2367 | |
b28b4943 | 2368 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 2369 | |
fd349c02 JH |
2370 | skb_pull(skb, sizeof(*info)); |
2371 | ||
2372 | memcpy(smp->irk, info->irk, 16); | |
2373 | ||
2374 | return 0; | |
2375 | } | |
2376 | ||
2377 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
2378 | struct sk_buff *skb) | |
2379 | { | |
2380 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
2381 | struct l2cap_chan *chan = conn->smp; |
2382 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2383 | struct hci_conn *hcon = conn->hcon; |
2384 | bdaddr_t rpa; | |
2385 | ||
2386 | BT_DBG(""); | |
2387 | ||
2388 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2389 | return SMP_INVALID_PARAMS; |
fd349c02 | 2390 | |
9747a9f3 JH |
2391 | /* Mark the information as received */ |
2392 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
2393 | ||
b28b4943 JH |
2394 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
2395 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
2396 | ||
fd349c02 JH |
2397 | skb_pull(skb, sizeof(*info)); |
2398 | ||
a9a58f86 JH |
2399 | /* Strictly speaking the Core Specification (4.1) allows sending |
2400 | * an empty address which would force us to rely on just the IRK | |
2401 | * as "identity information". However, since such | |
2402 | * implementations are not known of and in order to not over | |
2403 | * complicate our implementation, simply pretend that we never | |
2404 | * received an IRK for such a device. | |
e12af489 JH |
2405 | * |
2406 | * The Identity Address must also be a Static Random or Public | |
2407 | * Address, which hci_is_identity_address() checks for. | |
a9a58f86 | 2408 | */ |
e12af489 JH |
2409 | if (!bacmp(&info->bdaddr, BDADDR_ANY) || |
2410 | !hci_is_identity_address(&info->bdaddr, info->addr_type)) { | |
a9a58f86 | 2411 | BT_ERR("Ignoring IRK with no identity address"); |
31dd624e | 2412 | goto distribute; |
a9a58f86 JH |
2413 | } |
2414 | ||
fd349c02 JH |
2415 | bacpy(&smp->id_addr, &info->bdaddr); |
2416 | smp->id_addr_type = info->addr_type; | |
2417 | ||
2418 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
2419 | bacpy(&rpa, &hcon->dst); | |
2420 | else | |
2421 | bacpy(&rpa, BDADDR_ANY); | |
2422 | ||
23d0e128 JH |
2423 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
2424 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 2425 | |
31dd624e | 2426 | distribute: |
c6e81e9a JH |
2427 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
2428 | smp_distribute_keys(smp); | |
fd349c02 JH |
2429 | |
2430 | return 0; | |
2431 | } | |
2432 | ||
7ee4ea36 MH |
2433 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2434 | { | |
2435 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
2436 | struct l2cap_chan *chan = conn->smp; |
2437 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
2438 | struct smp_csrk *csrk; |
2439 | ||
2440 | BT_DBG("conn %p", conn); | |
2441 | ||
2442 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2443 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 2444 | |
7ee4ea36 MH |
2445 | /* Mark the information as received */ |
2446 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
2447 | ||
2448 | skb_pull(skb, sizeof(*rp)); | |
2449 | ||
7ee4ea36 MH |
2450 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
2451 | if (csrk) { | |
4cd3928a JH |
2452 | if (conn->hcon->sec_level > BT_SECURITY_MEDIUM) |
2453 | csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED; | |
2454 | else | |
2455 | csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED; | |
7ee4ea36 MH |
2456 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); |
2457 | } | |
2458 | smp->csrk = csrk; | |
d6268e86 | 2459 | smp_distribute_keys(smp); |
7ee4ea36 MH |
2460 | |
2461 | return 0; | |
2462 | } | |
2463 | ||
5e3d3d9b JH |
2464 | static u8 sc_select_method(struct smp_chan *smp) |
2465 | { | |
2466 | struct l2cap_conn *conn = smp->conn; | |
2467 | struct hci_conn *hcon = conn->hcon; | |
2468 | struct smp_cmd_pairing *local, *remote; | |
2469 | u8 local_mitm, remote_mitm, local_io, remote_io, method; | |
2470 | ||
1a8bab4f JH |
2471 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) || |
2472 | test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) | |
a29b0733 JH |
2473 | return REQ_OOB; |
2474 | ||
5e3d3d9b JH |
2475 | /* The preq/prsp contain the raw Pairing Request/Response PDUs |
2476 | * which are needed as inputs to some crypto functions. To get | |
2477 | * the "struct smp_cmd_pairing" from them we need to skip the | |
2478 | * first byte which contains the opcode. | |
2479 | */ | |
2480 | if (hcon->out) { | |
2481 | local = (void *) &smp->preq[1]; | |
2482 | remote = (void *) &smp->prsp[1]; | |
2483 | } else { | |
2484 | local = (void *) &smp->prsp[1]; | |
2485 | remote = (void *) &smp->preq[1]; | |
2486 | } | |
2487 | ||
2488 | local_io = local->io_capability; | |
2489 | remote_io = remote->io_capability; | |
2490 | ||
2491 | local_mitm = (local->auth_req & SMP_AUTH_MITM); | |
2492 | remote_mitm = (remote->auth_req & SMP_AUTH_MITM); | |
2493 | ||
2494 | /* If either side wants MITM, look up the method from the table, | |
2495 | * otherwise use JUST WORKS. | |
2496 | */ | |
2497 | if (local_mitm || remote_mitm) | |
2498 | method = get_auth_method(smp, local_io, remote_io); | |
2499 | else | |
2500 | method = JUST_WORKS; | |
2501 | ||
2502 | /* Don't confirm locally initiated pairing attempts */ | |
2503 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) | |
2504 | method = JUST_WORKS; | |
2505 | ||
2506 | return method; | |
2507 | } | |
2508 | ||
d8f8edbe JH |
2509 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
2510 | { | |
2511 | struct smp_cmd_public_key *key = (void *) skb->data; | |
2512 | struct hci_conn *hcon = conn->hcon; | |
2513 | struct l2cap_chan *chan = conn->smp; | |
2514 | struct smp_chan *smp = chan->data; | |
5e3d3d9b | 2515 | struct hci_dev *hdev = hcon->hdev; |
cbbbe3e2 | 2516 | struct smp_cmd_pairing_confirm cfm; |
d8f8edbe JH |
2517 | int err; |
2518 | ||
2519 | BT_DBG("conn %p", conn); | |
2520 | ||
2521 | if (skb->len < sizeof(*key)) | |
2522 | return SMP_INVALID_PARAMS; | |
2523 | ||
2524 | memcpy(smp->remote_pk, key, 64); | |
2525 | ||
a8ca617c JH |
2526 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) { |
2527 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk, | |
2528 | smp->rr, 0, cfm.confirm_val); | |
2529 | if (err) | |
2530 | return SMP_UNSPECIFIED; | |
2531 | ||
2532 | if (memcmp(cfm.confirm_val, smp->pcnf, 16)) | |
2533 | return SMP_CONFIRM_FAILED; | |
2534 | } | |
2535 | ||
d8f8edbe JH |
2536 | /* Non-initiating device sends its public key after receiving |
2537 | * the key from the initiating device. | |
2538 | */ | |
2539 | if (!hcon->out) { | |
2540 | err = sc_send_public_key(smp); | |
2541 | if (err) | |
2542 | return err; | |
2543 | } | |
2544 | ||
c7a3d57d JH |
2545 | SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk); |
2546 | SMP_DBG("Remote Public Key Y: %32phN", &smp->remote_pk[32]); | |
d8f8edbe JH |
2547 | |
2548 | if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey)) | |
2549 | return SMP_UNSPECIFIED; | |
2550 | ||
c7a3d57d | 2551 | SMP_DBG("DHKey %32phN", smp->dhkey); |
d8f8edbe JH |
2552 | |
2553 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
2554 | ||
5e3d3d9b JH |
2555 | smp->method = sc_select_method(smp); |
2556 | ||
2557 | BT_DBG("%s selected method 0x%02x", hdev->name, smp->method); | |
2558 | ||
2559 | /* JUST_WORKS and JUST_CFM result in an unauthenticated key */ | |
2560 | if (smp->method == JUST_WORKS || smp->method == JUST_CFM) | |
2561 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; | |
2562 | else | |
2563 | hcon->pending_sec_level = BT_SECURITY_FIPS; | |
2564 | ||
aeb7d461 JH |
2565 | if (!memcmp(debug_pk, smp->remote_pk, 64)) |
2566 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
2567 | ||
38606f14 JH |
2568 | if (smp->method == DSP_PASSKEY) { |
2569 | get_random_bytes(&hcon->passkey_notify, | |
2570 | sizeof(hcon->passkey_notify)); | |
2571 | hcon->passkey_notify %= 1000000; | |
2572 | hcon->passkey_entered = 0; | |
2573 | smp->passkey_round = 0; | |
2574 | if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type, | |
2575 | hcon->dst_type, | |
2576 | hcon->passkey_notify, | |
2577 | hcon->passkey_entered)) | |
2578 | return SMP_UNSPECIFIED; | |
2579 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2580 | return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY); | |
2581 | } | |
2582 | ||
94ea7257 | 2583 | if (smp->method == REQ_OOB) { |
a29b0733 JH |
2584 | if (hcon->out) |
2585 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2586 | sizeof(smp->prnd), smp->prnd); | |
2587 | ||
2588 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2589 | ||
2590 | return 0; | |
2591 | } | |
2592 | ||
38606f14 JH |
2593 | if (hcon->out) |
2594 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2595 | ||
2596 | if (smp->method == REQ_PASSKEY) { | |
2597 | if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type, | |
2598 | hcon->dst_type)) | |
2599 | return SMP_UNSPECIFIED; | |
2600 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2601 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
2602 | return 0; | |
2603 | } | |
2604 | ||
cbbbe3e2 JH |
2605 | /* The Initiating device waits for the non-initiating device to |
2606 | * send the confirm value. | |
2607 | */ | |
2608 | if (conn->hcon->out) | |
2609 | return 0; | |
2610 | ||
2611 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, | |
2612 | 0, cfm.confirm_val); | |
2613 | if (err) | |
2614 | return SMP_UNSPECIFIED; | |
2615 | ||
2616 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
2617 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2618 | ||
d8f8edbe JH |
2619 | return 0; |
2620 | } | |
2621 | ||
6433a9a2 JH |
2622 | static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb) |
2623 | { | |
2624 | struct smp_cmd_dhkey_check *check = (void *) skb->data; | |
2625 | struct l2cap_chan *chan = conn->smp; | |
2626 | struct hci_conn *hcon = conn->hcon; | |
2627 | struct smp_chan *smp = chan->data; | |
2628 | u8 a[7], b[7], *local_addr, *remote_addr; | |
2629 | u8 io_cap[3], r[16], e[16]; | |
2630 | int err; | |
2631 | ||
2632 | BT_DBG("conn %p", conn); | |
2633 | ||
2634 | if (skb->len < sizeof(*check)) | |
2635 | return SMP_INVALID_PARAMS; | |
2636 | ||
2637 | memcpy(a, &hcon->init_addr, 6); | |
2638 | memcpy(b, &hcon->resp_addr, 6); | |
2639 | a[6] = hcon->init_addr_type; | |
2640 | b[6] = hcon->resp_addr_type; | |
2641 | ||
2642 | if (hcon->out) { | |
2643 | local_addr = a; | |
2644 | remote_addr = b; | |
2645 | memcpy(io_cap, &smp->prsp[1], 3); | |
2646 | } else { | |
2647 | local_addr = b; | |
2648 | remote_addr = a; | |
2649 | memcpy(io_cap, &smp->preq[1], 3); | |
2650 | } | |
2651 | ||
2652 | memset(r, 0, sizeof(r)); | |
2653 | ||
38606f14 JH |
2654 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2655 | put_unaligned_le32(hcon->passkey_notify, r); | |
882fafad JH |
2656 | else if (smp->method == REQ_OOB) |
2657 | memcpy(r, smp->lr, 16); | |
38606f14 | 2658 | |
6433a9a2 JH |
2659 | err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r, |
2660 | io_cap, remote_addr, local_addr, e); | |
2661 | if (err) | |
2662 | return SMP_UNSPECIFIED; | |
2663 | ||
2664 | if (memcmp(check->e, e, 16)) | |
2665 | return SMP_DHKEY_CHECK_FAILED; | |
2666 | ||
d3e54a87 JH |
2667 | if (!hcon->out) { |
2668 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
2669 | set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags); | |
2670 | return 0; | |
2671 | } | |
d378a2d7 | 2672 | |
d3e54a87 JH |
2673 | /* Slave sends DHKey check as response to master */ |
2674 | sc_dhkey_check(smp); | |
2675 | } | |
d378a2d7 | 2676 | |
d3e54a87 | 2677 | sc_add_ltk(smp); |
6433a9a2 JH |
2678 | |
2679 | if (hcon->out) { | |
2680 | hci_le_start_enc(hcon, 0, 0, smp->tk); | |
2681 | hcon->enc_key_size = smp->enc_key_size; | |
2682 | } | |
2683 | ||
2684 | return 0; | |
2685 | } | |
2686 | ||
1408bb6e JH |
2687 | static int smp_cmd_keypress_notify(struct l2cap_conn *conn, |
2688 | struct sk_buff *skb) | |
2689 | { | |
2690 | struct smp_cmd_keypress_notify *kp = (void *) skb->data; | |
2691 | ||
2692 | BT_DBG("value 0x%02x", kp->value); | |
2693 | ||
2694 | return 0; | |
2695 | } | |
2696 | ||
4befb867 | 2697 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 2698 | { |
5d88cc73 | 2699 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 2700 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 2701 | struct smp_chan *smp; |
92381f5c | 2702 | __u8 code, reason; |
eb492e01 AB |
2703 | int err = 0; |
2704 | ||
8ae9b984 | 2705 | if (skb->len < 1) |
92381f5c | 2706 | return -EILSEQ; |
92381f5c | 2707 | |
d7a5a11d | 2708 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) { |
2e65c9d2 AG |
2709 | reason = SMP_PAIRING_NOTSUPP; |
2710 | goto done; | |
2711 | } | |
2712 | ||
92381f5c | 2713 | code = skb->data[0]; |
eb492e01 AB |
2714 | skb_pull(skb, sizeof(code)); |
2715 | ||
b28b4943 JH |
2716 | smp = chan->data; |
2717 | ||
2718 | if (code > SMP_CMD_MAX) | |
2719 | goto drop; | |
2720 | ||
24bd0bd9 | 2721 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
2722 | goto drop; |
2723 | ||
2724 | /* If we don't have a context the only allowed commands are | |
2725 | * pairing request and security request. | |
8cf9fa12 | 2726 | */ |
b28b4943 JH |
2727 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
2728 | goto drop; | |
8cf9fa12 | 2729 | |
eb492e01 AB |
2730 | switch (code) { |
2731 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 2732 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
2733 | break; |
2734 | ||
2735 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 2736 | smp_failure(conn, 0); |
da85e5e5 | 2737 | err = -EPERM; |
eb492e01 AB |
2738 | break; |
2739 | ||
2740 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 2741 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
2742 | break; |
2743 | ||
2744 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 2745 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
2746 | break; |
2747 | ||
eb492e01 | 2748 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 2749 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
2750 | break; |
2751 | ||
eb492e01 | 2752 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 2753 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
2754 | break; |
2755 | ||
eb492e01 | 2756 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
2757 | reason = smp_cmd_encrypt_info(conn, skb); |
2758 | break; | |
2759 | ||
eb492e01 | 2760 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
2761 | reason = smp_cmd_master_ident(conn, skb); |
2762 | break; | |
2763 | ||
eb492e01 | 2764 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
2765 | reason = smp_cmd_ident_info(conn, skb); |
2766 | break; | |
2767 | ||
eb492e01 | 2768 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
2769 | reason = smp_cmd_ident_addr_info(conn, skb); |
2770 | break; | |
2771 | ||
eb492e01 | 2772 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 2773 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
2774 | break; |
2775 | ||
d8f8edbe JH |
2776 | case SMP_CMD_PUBLIC_KEY: |
2777 | reason = smp_cmd_public_key(conn, skb); | |
2778 | break; | |
2779 | ||
6433a9a2 JH |
2780 | case SMP_CMD_DHKEY_CHECK: |
2781 | reason = smp_cmd_dhkey_check(conn, skb); | |
2782 | break; | |
2783 | ||
1408bb6e JH |
2784 | case SMP_CMD_KEYPRESS_NOTIFY: |
2785 | reason = smp_cmd_keypress_notify(conn, skb); | |
2786 | break; | |
2787 | ||
eb492e01 AB |
2788 | default: |
2789 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 2790 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 2791 | goto done; |
eb492e01 AB |
2792 | } |
2793 | ||
3a0259bb | 2794 | done: |
9b7b18ef JH |
2795 | if (!err) { |
2796 | if (reason) | |
2797 | smp_failure(conn, reason); | |
8ae9b984 | 2798 | kfree_skb(skb); |
9b7b18ef JH |
2799 | } |
2800 | ||
eb492e01 | 2801 | return err; |
b28b4943 JH |
2802 | |
2803 | drop: | |
2804 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
2805 | code, &hcon->dst); | |
2806 | kfree_skb(skb); | |
2807 | return 0; | |
eb492e01 | 2808 | } |
7034b911 | 2809 | |
70db83c4 JH |
2810 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
2811 | { | |
2812 | struct l2cap_conn *conn = chan->conn; | |
2813 | ||
2814 | BT_DBG("chan %p", chan); | |
2815 | ||
fc75cc86 | 2816 | if (chan->data) |
5d88cc73 | 2817 | smp_chan_destroy(conn); |
5d88cc73 | 2818 | |
70db83c4 JH |
2819 | conn->smp = NULL; |
2820 | l2cap_chan_put(chan); | |
2821 | } | |
2822 | ||
b5ae344d JH |
2823 | static void bredr_pairing(struct l2cap_chan *chan) |
2824 | { | |
2825 | struct l2cap_conn *conn = chan->conn; | |
2826 | struct hci_conn *hcon = conn->hcon; | |
2827 | struct hci_dev *hdev = hcon->hdev; | |
2828 | struct smp_cmd_pairing req; | |
2829 | struct smp_chan *smp; | |
2830 | ||
2831 | BT_DBG("chan %p", chan); | |
2832 | ||
2833 | /* Only new pairings are interesting */ | |
2834 | if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags)) | |
2835 | return; | |
2836 | ||
2837 | /* Don't bother if we're not encrypted */ | |
2838 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
2839 | return; | |
2840 | ||
2841 | /* Only master may initiate SMP over BR/EDR */ | |
2842 | if (hcon->role != HCI_ROLE_MASTER) | |
2843 | return; | |
2844 | ||
2845 | /* Secure Connections support must be enabled */ | |
d7a5a11d | 2846 | if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED)) |
b5ae344d JH |
2847 | return; |
2848 | ||
2849 | /* BR/EDR must use Secure Connections for SMP */ | |
2850 | if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) && | |
b7cb93e5 | 2851 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
2852 | return; |
2853 | ||
2854 | /* If our LE support is not enabled don't do anything */ | |
d7a5a11d | 2855 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
b5ae344d JH |
2856 | return; |
2857 | ||
2858 | /* Don't bother if remote LE support is not enabled */ | |
2859 | if (!lmp_host_le_capable(hcon)) | |
2860 | return; | |
2861 | ||
2862 | /* Remote must support SMP fixed chan for BR/EDR */ | |
2863 | if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR)) | |
2864 | return; | |
2865 | ||
2866 | /* Don't bother if SMP is already ongoing */ | |
2867 | if (chan->data) | |
2868 | return; | |
2869 | ||
2870 | smp = smp_chan_create(conn); | |
2871 | if (!smp) { | |
2872 | BT_ERR("%s unable to create SMP context for BR/EDR", | |
2873 | hdev->name); | |
2874 | return; | |
2875 | } | |
2876 | ||
2877 | set_bit(SMP_FLAG_SC, &smp->flags); | |
2878 | ||
2879 | BT_DBG("%s starting SMP over BR/EDR", hdev->name); | |
2880 | ||
2881 | /* Prepare and send the BR/EDR SMP Pairing Request */ | |
2882 | build_bredr_pairing_cmd(smp, &req, NULL); | |
2883 | ||
2884 | smp->preq[0] = SMP_CMD_PAIRING_REQ; | |
2885 | memcpy(&smp->preq[1], &req, sizeof(req)); | |
2886 | ||
2887 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req); | |
2888 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); | |
2889 | } | |
2890 | ||
44f1a7ab JH |
2891 | static void smp_resume_cb(struct l2cap_chan *chan) |
2892 | { | |
b68fda68 | 2893 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
2894 | struct l2cap_conn *conn = chan->conn; |
2895 | struct hci_conn *hcon = conn->hcon; | |
2896 | ||
2897 | BT_DBG("chan %p", chan); | |
2898 | ||
b5ae344d JH |
2899 | if (hcon->type == ACL_LINK) { |
2900 | bredr_pairing(chan); | |
ef8efe4b | 2901 | return; |
b5ae344d | 2902 | } |
ef8efe4b | 2903 | |
86d1407c JH |
2904 | if (!smp) |
2905 | return; | |
b68fda68 | 2906 | |
84bc0db5 JH |
2907 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
2908 | return; | |
2909 | ||
86d1407c JH |
2910 | cancel_delayed_work(&smp->security_timer); |
2911 | ||
d6268e86 | 2912 | smp_distribute_keys(smp); |
44f1a7ab JH |
2913 | } |
2914 | ||
70db83c4 JH |
2915 | static void smp_ready_cb(struct l2cap_chan *chan) |
2916 | { | |
2917 | struct l2cap_conn *conn = chan->conn; | |
b5ae344d | 2918 | struct hci_conn *hcon = conn->hcon; |
70db83c4 JH |
2919 | |
2920 | BT_DBG("chan %p", chan); | |
2921 | ||
2922 | conn->smp = chan; | |
2923 | l2cap_chan_hold(chan); | |
b5ae344d JH |
2924 | |
2925 | if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
2926 | bredr_pairing(chan); | |
70db83c4 JH |
2927 | } |
2928 | ||
4befb867 JH |
2929 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
2930 | { | |
2931 | int err; | |
2932 | ||
2933 | BT_DBG("chan %p", chan); | |
2934 | ||
2935 | err = smp_sig_channel(chan, skb); | |
2936 | if (err) { | |
b68fda68 | 2937 | struct smp_chan *smp = chan->data; |
4befb867 | 2938 | |
b68fda68 JH |
2939 | if (smp) |
2940 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 2941 | |
1e91c29e | 2942 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
2943 | } |
2944 | ||
2945 | return err; | |
2946 | } | |
2947 | ||
70db83c4 JH |
2948 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
2949 | unsigned long hdr_len, | |
2950 | unsigned long len, int nb) | |
2951 | { | |
2952 | struct sk_buff *skb; | |
2953 | ||
2954 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
2955 | if (!skb) | |
2956 | return ERR_PTR(-ENOMEM); | |
2957 | ||
2958 | skb->priority = HCI_PRIO_MAX; | |
2959 | bt_cb(skb)->chan = chan; | |
2960 | ||
2961 | return skb; | |
2962 | } | |
2963 | ||
2964 | static const struct l2cap_ops smp_chan_ops = { | |
2965 | .name = "Security Manager", | |
2966 | .ready = smp_ready_cb, | |
5d88cc73 | 2967 | .recv = smp_recv_cb, |
70db83c4 JH |
2968 | .alloc_skb = smp_alloc_skb_cb, |
2969 | .teardown = smp_teardown_cb, | |
44f1a7ab | 2970 | .resume = smp_resume_cb, |
70db83c4 JH |
2971 | |
2972 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
2973 | .state_change = l2cap_chan_no_state_change, |
2974 | .close = l2cap_chan_no_close, | |
2975 | .defer = l2cap_chan_no_defer, | |
2976 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
2977 | .set_shutdown = l2cap_chan_no_set_shutdown, |
2978 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
2979 | }; |
2980 | ||
2981 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
2982 | { | |
2983 | struct l2cap_chan *chan; | |
2984 | ||
2985 | BT_DBG("pchan %p", pchan); | |
2986 | ||
2987 | chan = l2cap_chan_create(); | |
2988 | if (!chan) | |
2989 | return NULL; | |
2990 | ||
2991 | chan->chan_type = pchan->chan_type; | |
2992 | chan->ops = &smp_chan_ops; | |
2993 | chan->scid = pchan->scid; | |
2994 | chan->dcid = chan->scid; | |
2995 | chan->imtu = pchan->imtu; | |
2996 | chan->omtu = pchan->omtu; | |
2997 | chan->mode = pchan->mode; | |
2998 | ||
abe84903 JH |
2999 | /* Other L2CAP channels may request SMP routines in order to |
3000 | * change the security level. This means that the SMP channel | |
3001 | * lock must be considered in its own category to avoid lockdep | |
3002 | * warnings. | |
3003 | */ | |
3004 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
3005 | ||
70db83c4 JH |
3006 | BT_DBG("created chan %p", chan); |
3007 | ||
3008 | return chan; | |
3009 | } | |
3010 | ||
3011 | static const struct l2cap_ops smp_root_chan_ops = { | |
3012 | .name = "Security Manager Root", | |
3013 | .new_connection = smp_new_conn_cb, | |
3014 | ||
3015 | /* None of these are implemented for the root channel */ | |
3016 | .close = l2cap_chan_no_close, | |
3017 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
3018 | .recv = l2cap_chan_no_recv, | |
3019 | .state_change = l2cap_chan_no_state_change, | |
3020 | .teardown = l2cap_chan_no_teardown, | |
3021 | .ready = l2cap_chan_no_ready, | |
3022 | .defer = l2cap_chan_no_defer, | |
3023 | .suspend = l2cap_chan_no_suspend, | |
3024 | .resume = l2cap_chan_no_resume, | |
3025 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
3026 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3027 | }; |
3028 | ||
ef8efe4b | 3029 | static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) |
711eafe3 | 3030 | { |
70db83c4 | 3031 | struct l2cap_chan *chan; |
88a479d9 MH |
3032 | struct smp_dev *smp; |
3033 | struct crypto_blkcipher *tfm_aes; | |
6e2dc6d1 | 3034 | struct crypto_hash *tfm_cmac; |
70db83c4 | 3035 | |
ef8efe4b | 3036 | if (cid == L2CAP_CID_SMP_BREDR) { |
88a479d9 | 3037 | smp = NULL; |
ef8efe4b JH |
3038 | goto create_chan; |
3039 | } | |
711eafe3 | 3040 | |
88a479d9 MH |
3041 | smp = kzalloc(sizeof(*smp), GFP_KERNEL); |
3042 | if (!smp) | |
3043 | return ERR_PTR(-ENOMEM); | |
3044 | ||
3045 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); | |
defce9e8 | 3046 | if (IS_ERR(tfm_aes)) { |
88a479d9 MH |
3047 | BT_ERR("Unable to create ECB crypto context"); |
3048 | kzfree(smp); | |
fe700771 | 3049 | return ERR_CAST(tfm_aes); |
711eafe3 JH |
3050 | } |
3051 | ||
6e2dc6d1 MH |
3052 | tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
3053 | if (IS_ERR(tfm_cmac)) { | |
3054 | BT_ERR("Unable to create CMAC crypto context"); | |
3055 | crypto_free_blkcipher(tfm_aes); | |
3056 | kzfree(smp); | |
3057 | return ERR_CAST(tfm_cmac); | |
3058 | } | |
3059 | ||
88a479d9 | 3060 | smp->tfm_aes = tfm_aes; |
6e2dc6d1 | 3061 | smp->tfm_cmac = tfm_cmac; |
88a479d9 | 3062 | |
ef8efe4b | 3063 | create_chan: |
70db83c4 JH |
3064 | chan = l2cap_chan_create(); |
3065 | if (!chan) { | |
88a479d9 | 3066 | crypto_free_blkcipher(smp->tfm_aes); |
6e2dc6d1 | 3067 | crypto_free_hash(smp->tfm_cmac); |
88a479d9 | 3068 | kzfree(smp); |
ef8efe4b | 3069 | return ERR_PTR(-ENOMEM); |
70db83c4 JH |
3070 | } |
3071 | ||
88a479d9 | 3072 | chan->data = smp; |
defce9e8 | 3073 | |
ef8efe4b | 3074 | l2cap_add_scid(chan, cid); |
70db83c4 JH |
3075 | |
3076 | l2cap_chan_set_defaults(chan); | |
3077 | ||
157029ba | 3078 | if (cid == L2CAP_CID_SMP) { |
39e3e744 JH |
3079 | u8 bdaddr_type; |
3080 | ||
3081 | hci_copy_identity_address(hdev, &chan->src, &bdaddr_type); | |
3082 | ||
3083 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) | |
157029ba | 3084 | chan->src_type = BDADDR_LE_PUBLIC; |
39e3e744 JH |
3085 | else |
3086 | chan->src_type = BDADDR_LE_RANDOM; | |
157029ba MH |
3087 | } else { |
3088 | bacpy(&chan->src, &hdev->bdaddr); | |
ef8efe4b | 3089 | chan->src_type = BDADDR_BREDR; |
157029ba MH |
3090 | } |
3091 | ||
70db83c4 JH |
3092 | chan->state = BT_LISTEN; |
3093 | chan->mode = L2CAP_MODE_BASIC; | |
3094 | chan->imtu = L2CAP_DEFAULT_MTU; | |
3095 | chan->ops = &smp_root_chan_ops; | |
3096 | ||
abe84903 JH |
3097 | /* Set correct nesting level for a parent/listening channel */ |
3098 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
3099 | ||
ef8efe4b | 3100 | return chan; |
711eafe3 JH |
3101 | } |
3102 | ||
ef8efe4b | 3103 | static void smp_del_chan(struct l2cap_chan *chan) |
711eafe3 | 3104 | { |
88a479d9 | 3105 | struct smp_dev *smp; |
70db83c4 | 3106 | |
ef8efe4b | 3107 | BT_DBG("chan %p", chan); |
711eafe3 | 3108 | |
88a479d9 MH |
3109 | smp = chan->data; |
3110 | if (smp) { | |
defce9e8 | 3111 | chan->data = NULL; |
88a479d9 MH |
3112 | if (smp->tfm_aes) |
3113 | crypto_free_blkcipher(smp->tfm_aes); | |
6e2dc6d1 MH |
3114 | if (smp->tfm_cmac) |
3115 | crypto_free_hash(smp->tfm_cmac); | |
88a479d9 | 3116 | kzfree(smp); |
711eafe3 | 3117 | } |
70db83c4 | 3118 | |
70db83c4 | 3119 | l2cap_chan_put(chan); |
711eafe3 | 3120 | } |
ef8efe4b | 3121 | |
300acfde MH |
3122 | static ssize_t force_bredr_smp_read(struct file *file, |
3123 | char __user *user_buf, | |
3124 | size_t count, loff_t *ppos) | |
3125 | { | |
3126 | struct hci_dev *hdev = file->private_data; | |
3127 | char buf[3]; | |
3128 | ||
b7cb93e5 | 3129 | buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; |
300acfde MH |
3130 | buf[1] = '\n'; |
3131 | buf[2] = '\0'; | |
3132 | return simple_read_from_buffer(user_buf, count, ppos, buf, 2); | |
3133 | } | |
3134 | ||
3135 | static ssize_t force_bredr_smp_write(struct file *file, | |
3136 | const char __user *user_buf, | |
3137 | size_t count, loff_t *ppos) | |
3138 | { | |
3139 | struct hci_dev *hdev = file->private_data; | |
3140 | char buf[32]; | |
3141 | size_t buf_size = min(count, (sizeof(buf)-1)); | |
3142 | bool enable; | |
3143 | ||
3144 | if (copy_from_user(buf, user_buf, buf_size)) | |
3145 | return -EFAULT; | |
3146 | ||
3147 | buf[buf_size] = '\0'; | |
3148 | if (strtobool(buf, &enable)) | |
3149 | return -EINVAL; | |
3150 | ||
b7cb93e5 | 3151 | if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
300acfde MH |
3152 | return -EALREADY; |
3153 | ||
3154 | if (enable) { | |
3155 | struct l2cap_chan *chan; | |
3156 | ||
3157 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); | |
3158 | if (IS_ERR(chan)) | |
3159 | return PTR_ERR(chan); | |
3160 | ||
3161 | hdev->smp_bredr_data = chan; | |
3162 | } else { | |
3163 | struct l2cap_chan *chan; | |
3164 | ||
3165 | chan = hdev->smp_bredr_data; | |
3166 | hdev->smp_bredr_data = NULL; | |
3167 | smp_del_chan(chan); | |
3168 | } | |
3169 | ||
b7cb93e5 | 3170 | hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); |
300acfde MH |
3171 | |
3172 | return count; | |
3173 | } | |
3174 | ||
3175 | static const struct file_operations force_bredr_smp_fops = { | |
3176 | .open = simple_open, | |
3177 | .read = force_bredr_smp_read, | |
3178 | .write = force_bredr_smp_write, | |
3179 | .llseek = default_llseek, | |
3180 | }; | |
3181 | ||
ef8efe4b JH |
3182 | int smp_register(struct hci_dev *hdev) |
3183 | { | |
3184 | struct l2cap_chan *chan; | |
3185 | ||
3186 | BT_DBG("%s", hdev->name); | |
3187 | ||
7e7ec445 MH |
3188 | /* If the controller does not support Low Energy operation, then |
3189 | * there is also no need to register any SMP channel. | |
3190 | */ | |
3191 | if (!lmp_le_capable(hdev)) | |
3192 | return 0; | |
3193 | ||
2b8df323 MH |
3194 | if (WARN_ON(hdev->smp_data)) { |
3195 | chan = hdev->smp_data; | |
3196 | hdev->smp_data = NULL; | |
3197 | smp_del_chan(chan); | |
3198 | } | |
3199 | ||
ef8efe4b JH |
3200 | chan = smp_add_cid(hdev, L2CAP_CID_SMP); |
3201 | if (IS_ERR(chan)) | |
3202 | return PTR_ERR(chan); | |
3203 | ||
3204 | hdev->smp_data = chan; | |
3205 | ||
300acfde MH |
3206 | /* If the controller does not support BR/EDR Secure Connections |
3207 | * feature, then the BR/EDR SMP channel shall not be present. | |
3208 | * | |
3209 | * To test this with Bluetooth 4.0 controllers, create a debugfs | |
3210 | * switch that allows forcing BR/EDR SMP support and accepting | |
3211 | * cross-transport pairing on non-AES encrypted connections. | |
3212 | */ | |
3213 | if (!lmp_sc_capable(hdev)) { | |
3214 | debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, | |
3215 | hdev, &force_bredr_smp_fops); | |
ef8efe4b | 3216 | return 0; |
300acfde | 3217 | } |
ef8efe4b | 3218 | |
2b8df323 MH |
3219 | if (WARN_ON(hdev->smp_bredr_data)) { |
3220 | chan = hdev->smp_bredr_data; | |
3221 | hdev->smp_bredr_data = NULL; | |
3222 | smp_del_chan(chan); | |
3223 | } | |
3224 | ||
ef8efe4b JH |
3225 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); |
3226 | if (IS_ERR(chan)) { | |
3227 | int err = PTR_ERR(chan); | |
3228 | chan = hdev->smp_data; | |
3229 | hdev->smp_data = NULL; | |
3230 | smp_del_chan(chan); | |
3231 | return err; | |
3232 | } | |
3233 | ||
3234 | hdev->smp_bredr_data = chan; | |
3235 | ||
3236 | return 0; | |
3237 | } | |
3238 | ||
3239 | void smp_unregister(struct hci_dev *hdev) | |
3240 | { | |
3241 | struct l2cap_chan *chan; | |
3242 | ||
3243 | if (hdev->smp_bredr_data) { | |
3244 | chan = hdev->smp_bredr_data; | |
3245 | hdev->smp_bredr_data = NULL; | |
3246 | smp_del_chan(chan); | |
3247 | } | |
3248 | ||
3249 | if (hdev->smp_data) { | |
3250 | chan = hdev->smp_data; | |
3251 | hdev->smp_data = NULL; | |
3252 | smp_del_chan(chan); | |
3253 | } | |
3254 | } | |
0a2b0f04 JH |
3255 | |
3256 | #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP) | |
3257 | ||
cfc4198e JH |
3258 | static int __init test_ah(struct crypto_blkcipher *tfm_aes) |
3259 | { | |
3260 | const u8 irk[16] = { | |
3261 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3262 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3263 | const u8 r[3] = { 0x94, 0x81, 0x70 }; | |
3264 | const u8 exp[3] = { 0xaa, 0xfb, 0x0d }; | |
3265 | u8 res[3]; | |
3266 | int err; | |
3267 | ||
3268 | err = smp_ah(tfm_aes, irk, r, res); | |
3269 | if (err) | |
3270 | return err; | |
3271 | ||
3272 | if (memcmp(res, exp, 3)) | |
3273 | return -EINVAL; | |
3274 | ||
3275 | return 0; | |
3276 | } | |
3277 | ||
3278 | static int __init test_c1(struct crypto_blkcipher *tfm_aes) | |
3279 | { | |
3280 | const u8 k[16] = { | |
3281 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3282 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3283 | const u8 r[16] = { | |
3284 | 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63, | |
3285 | 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 }; | |
3286 | const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 }; | |
3287 | const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 }; | |
3288 | const u8 _iat = 0x01; | |
3289 | const u8 _rat = 0x00; | |
3290 | const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } }; | |
3291 | const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } }; | |
3292 | const u8 exp[16] = { | |
3293 | 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2, | |
3294 | 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e }; | |
3295 | u8 res[16]; | |
3296 | int err; | |
3297 | ||
3298 | err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res); | |
3299 | if (err) | |
3300 | return err; | |
3301 | ||
3302 | if (memcmp(res, exp, 16)) | |
3303 | return -EINVAL; | |
3304 | ||
3305 | return 0; | |
3306 | } | |
3307 | ||
3308 | static int __init test_s1(struct crypto_blkcipher *tfm_aes) | |
3309 | { | |
3310 | const u8 k[16] = { | |
3311 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3312 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3313 | const u8 r1[16] = { | |
3314 | 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }; | |
3315 | const u8 r2[16] = { | |
3316 | 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 }; | |
3317 | const u8 exp[16] = { | |
3318 | 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b, | |
3319 | 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a }; | |
3320 | u8 res[16]; | |
3321 | int err; | |
3322 | ||
3323 | err = smp_s1(tfm_aes, k, r1, r2, res); | |
3324 | if (err) | |
3325 | return err; | |
3326 | ||
3327 | if (memcmp(res, exp, 16)) | |
3328 | return -EINVAL; | |
3329 | ||
3330 | return 0; | |
3331 | } | |
3332 | ||
fb2969a3 JH |
3333 | static int __init test_f4(struct crypto_hash *tfm_cmac) |
3334 | { | |
3335 | const u8 u[32] = { | |
3336 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3337 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3338 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3339 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3340 | const u8 v[32] = { | |
3341 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3342 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3343 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3344 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3345 | const u8 x[16] = { | |
3346 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3347 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3348 | const u8 z = 0x00; | |
3349 | const u8 exp[16] = { | |
3350 | 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1, | |
3351 | 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 }; | |
3352 | u8 res[16]; | |
3353 | int err; | |
3354 | ||
3355 | err = smp_f4(tfm_cmac, u, v, x, z, res); | |
3356 | if (err) | |
3357 | return err; | |
3358 | ||
3359 | if (memcmp(res, exp, 16)) | |
3360 | return -EINVAL; | |
3361 | ||
3362 | return 0; | |
3363 | } | |
3364 | ||
3365 | static int __init test_f5(struct crypto_hash *tfm_cmac) | |
3366 | { | |
3367 | const u8 w[32] = { | |
3368 | 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86, | |
3369 | 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99, | |
3370 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3371 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3372 | const u8 n1[16] = { | |
3373 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3374 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3375 | const u8 n2[16] = { | |
3376 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3377 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3378 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3379 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3380 | const u8 exp_ltk[16] = { | |
3381 | 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98, | |
3382 | 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 }; | |
3383 | const u8 exp_mackey[16] = { | |
3384 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3385 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3386 | u8 mackey[16], ltk[16]; | |
3387 | int err; | |
3388 | ||
3389 | err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk); | |
3390 | if (err) | |
3391 | return err; | |
3392 | ||
3393 | if (memcmp(mackey, exp_mackey, 16)) | |
3394 | return -EINVAL; | |
3395 | ||
3396 | if (memcmp(ltk, exp_ltk, 16)) | |
3397 | return -EINVAL; | |
3398 | ||
3399 | return 0; | |
3400 | } | |
3401 | ||
3402 | static int __init test_f6(struct crypto_hash *tfm_cmac) | |
3403 | { | |
3404 | const u8 w[16] = { | |
3405 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3406 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3407 | const u8 n1[16] = { | |
3408 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3409 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3410 | const u8 n2[16] = { | |
3411 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3412 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3413 | const u8 r[16] = { | |
3414 | 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08, | |
3415 | 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 }; | |
3416 | const u8 io_cap[3] = { 0x02, 0x01, 0x01 }; | |
3417 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3418 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3419 | const u8 exp[16] = { | |
3420 | 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2, | |
3421 | 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 }; | |
3422 | u8 res[16]; | |
3423 | int err; | |
3424 | ||
3425 | err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res); | |
3426 | if (err) | |
3427 | return err; | |
3428 | ||
3429 | if (memcmp(res, exp, 16)) | |
3430 | return -EINVAL; | |
3431 | ||
3432 | return 0; | |
3433 | } | |
3434 | ||
3435 | static int __init test_g2(struct crypto_hash *tfm_cmac) | |
3436 | { | |
3437 | const u8 u[32] = { | |
3438 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3439 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3440 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3441 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3442 | const u8 v[32] = { | |
3443 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3444 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3445 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3446 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3447 | const u8 x[16] = { | |
3448 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3449 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3450 | const u8 y[16] = { | |
3451 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3452 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3453 | const u32 exp_val = 0x2f9ed5ba % 1000000; | |
3454 | u32 val; | |
3455 | int err; | |
3456 | ||
3457 | err = smp_g2(tfm_cmac, u, v, x, y, &val); | |
3458 | if (err) | |
3459 | return err; | |
3460 | ||
3461 | if (val != exp_val) | |
3462 | return -EINVAL; | |
3463 | ||
3464 | return 0; | |
3465 | } | |
3466 | ||
3467 | static int __init test_h6(struct crypto_hash *tfm_cmac) | |
3468 | { | |
3469 | const u8 w[16] = { | |
3470 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3471 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3472 | const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
3473 | const u8 exp[16] = { | |
3474 | 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8, | |
3475 | 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d }; | |
3476 | u8 res[16]; | |
3477 | int err; | |
3478 | ||
3479 | err = smp_h6(tfm_cmac, w, key_id, res); | |
3480 | if (err) | |
3481 | return err; | |
3482 | ||
3483 | if (memcmp(res, exp, 16)) | |
3484 | return -EINVAL; | |
3485 | ||
3486 | return 0; | |
3487 | } | |
3488 | ||
0a2b0f04 JH |
3489 | static int __init run_selftests(struct crypto_blkcipher *tfm_aes, |
3490 | struct crypto_hash *tfm_cmac) | |
3491 | { | |
255047b0 MH |
3492 | ktime_t calltime, delta, rettime; |
3493 | unsigned long long duration; | |
cfc4198e JH |
3494 | int err; |
3495 | ||
255047b0 MH |
3496 | calltime = ktime_get(); |
3497 | ||
cfc4198e JH |
3498 | err = test_ah(tfm_aes); |
3499 | if (err) { | |
3500 | BT_ERR("smp_ah test failed"); | |
3501 | return err; | |
3502 | } | |
3503 | ||
3504 | err = test_c1(tfm_aes); | |
3505 | if (err) { | |
3506 | BT_ERR("smp_c1 test failed"); | |
3507 | return err; | |
3508 | } | |
3509 | ||
3510 | err = test_s1(tfm_aes); | |
3511 | if (err) { | |
3512 | BT_ERR("smp_s1 test failed"); | |
3513 | return err; | |
3514 | } | |
3515 | ||
fb2969a3 JH |
3516 | err = test_f4(tfm_cmac); |
3517 | if (err) { | |
3518 | BT_ERR("smp_f4 test failed"); | |
3519 | return err; | |
3520 | } | |
3521 | ||
3522 | err = test_f5(tfm_cmac); | |
3523 | if (err) { | |
3524 | BT_ERR("smp_f5 test failed"); | |
3525 | return err; | |
3526 | } | |
3527 | ||
3528 | err = test_f6(tfm_cmac); | |
3529 | if (err) { | |
3530 | BT_ERR("smp_f6 test failed"); | |
3531 | return err; | |
3532 | } | |
3533 | ||
3534 | err = test_g2(tfm_cmac); | |
3535 | if (err) { | |
3536 | BT_ERR("smp_g2 test failed"); | |
3537 | return err; | |
3538 | } | |
3539 | ||
3540 | err = test_h6(tfm_cmac); | |
3541 | if (err) { | |
3542 | BT_ERR("smp_h6 test failed"); | |
3543 | return err; | |
3544 | } | |
3545 | ||
255047b0 MH |
3546 | rettime = ktime_get(); |
3547 | delta = ktime_sub(rettime, calltime); | |
3548 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
3549 | ||
5ced2464 | 3550 | BT_INFO("SMP test passed in %llu usecs", duration); |
0a2b0f04 JH |
3551 | |
3552 | return 0; | |
3553 | } | |
3554 | ||
3555 | int __init bt_selftest_smp(void) | |
3556 | { | |
3557 | struct crypto_blkcipher *tfm_aes; | |
3558 | struct crypto_hash *tfm_cmac; | |
3559 | int err; | |
3560 | ||
3561 | tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); | |
3562 | if (IS_ERR(tfm_aes)) { | |
3563 | BT_ERR("Unable to create ECB crypto context"); | |
3564 | return PTR_ERR(tfm_aes); | |
3565 | } | |
3566 | ||
3567 | tfm_cmac = crypto_alloc_hash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); | |
3568 | if (IS_ERR(tfm_cmac)) { | |
3569 | BT_ERR("Unable to create CMAC crypto context"); | |
3570 | crypto_free_blkcipher(tfm_aes); | |
3571 | return PTR_ERR(tfm_cmac); | |
3572 | } | |
3573 | ||
3574 | err = run_selftests(tfm_aes, tfm_cmac); | |
3575 | ||
3576 | crypto_free_hash(tfm_cmac); | |
3577 | crypto_free_blkcipher(tfm_aes); | |
3578 | ||
3579 | return err; | |
3580 | } | |
3581 | ||
3582 | #endif |