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/scatterlist.h> |
25 | #include <crypto/b128ops.h> | |
71af2f6b HX |
26 | #include <crypto/hash.h> |
27 | #include <crypto/skcipher.h> | |
8c520a59 | 28 | |
eb492e01 AB |
29 | #include <net/bluetooth/bluetooth.h> |
30 | #include <net/bluetooth/hci_core.h> | |
31 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 32 | #include <net/bluetooth/mgmt.h> |
ac4b7236 | 33 | |
3b19146d | 34 | #include "ecc.h" |
ac4b7236 | 35 | #include "smp.h" |
d22ef0bc | 36 | |
2fd36558 JH |
37 | #define SMP_DEV(hdev) \ |
38 | ((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data) | |
39 | ||
c7a3d57d JH |
40 | /* Low-level debug macros to be used for stuff that we don't want |
41 | * accidentially in dmesg, i.e. the values of the various crypto keys | |
42 | * and the inputs & outputs of crypto functions. | |
43 | */ | |
44 | #ifdef DEBUG | |
45 | #define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
46 | ##__VA_ARGS__) | |
47 | #else | |
48 | #define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \ | |
49 | ##__VA_ARGS__) | |
50 | #endif | |
51 | ||
b28b4943 | 52 | #define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd) |
b28b4943 | 53 | |
3b19146d JH |
54 | /* Keys which are not distributed with Secure Connections */ |
55 | #define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY); | |
56 | ||
17b02e62 | 57 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 58 | |
d7a5a11d | 59 | #define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \ |
0edb14de JH |
60 | 0x1f : 0x07) |
61 | #define KEY_DIST_MASK 0x07 | |
065a13e2 | 62 | |
cbbbe3e2 JH |
63 | /* Maximum message length that can be passed to aes_cmac */ |
64 | #define CMAC_MSG_MAX 80 | |
65 | ||
533e35d4 JH |
66 | enum { |
67 | SMP_FLAG_TK_VALID, | |
68 | SMP_FLAG_CFM_PENDING, | |
69 | SMP_FLAG_MITM_AUTH, | |
70 | SMP_FLAG_COMPLETE, | |
71 | SMP_FLAG_INITIATOR, | |
65668776 | 72 | SMP_FLAG_SC, |
d8f8edbe | 73 | SMP_FLAG_REMOTE_PK, |
aeb7d461 | 74 | SMP_FLAG_DEBUG_KEY, |
38606f14 | 75 | SMP_FLAG_WAIT_USER, |
d3e54a87 | 76 | SMP_FLAG_DHKEY_PENDING, |
1a8bab4f JH |
77 | SMP_FLAG_REMOTE_OOB, |
78 | SMP_FLAG_LOCAL_OOB, | |
533e35d4 | 79 | }; |
4bc58f51 | 80 | |
88a479d9 | 81 | struct smp_dev { |
60a27d65 MH |
82 | /* Secure Connections OOB data */ |
83 | u8 local_pk[64]; | |
84 | u8 local_sk[32]; | |
fb334fee | 85 | u8 local_rand[16]; |
60a27d65 MH |
86 | bool debug_key; |
87 | ||
b1f663c9 | 88 | u8 min_key_size; |
2fd36558 JH |
89 | u8 max_key_size; |
90 | ||
71af2f6b HX |
91 | struct crypto_skcipher *tfm_aes; |
92 | struct crypto_shash *tfm_cmac; | |
88a479d9 MH |
93 | }; |
94 | ||
4bc58f51 | 95 | struct smp_chan { |
b68fda68 JH |
96 | struct l2cap_conn *conn; |
97 | struct delayed_work security_timer; | |
b28b4943 | 98 | unsigned long allow_cmd; /* Bitmask of allowed commands */ |
b68fda68 | 99 | |
4bc58f51 JH |
100 | u8 preq[7]; /* SMP Pairing Request */ |
101 | u8 prsp[7]; /* SMP Pairing Response */ | |
102 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
103 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
104 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
105 | u8 tk[16]; /* SMP Temporary Key */ | |
882fafad JH |
106 | u8 rr[16]; /* Remote OOB ra/rb value */ |
107 | u8 lr[16]; /* Local OOB ra/rb value */ | |
4bc58f51 JH |
108 | u8 enc_key_size; |
109 | u8 remote_key_dist; | |
110 | bdaddr_t id_addr; | |
111 | u8 id_addr_type; | |
112 | u8 irk[16]; | |
113 | struct smp_csrk *csrk; | |
114 | struct smp_csrk *slave_csrk; | |
115 | struct smp_ltk *ltk; | |
116 | struct smp_ltk *slave_ltk; | |
117 | struct smp_irk *remote_irk; | |
6a77083a | 118 | u8 *link_key; |
4a74d658 | 119 | unsigned long flags; |
783e0574 | 120 | u8 method; |
38606f14 | 121 | u8 passkey_round; |
6a7bd103 | 122 | |
3b19146d JH |
123 | /* Secure Connections variables */ |
124 | u8 local_pk[64]; | |
125 | u8 local_sk[32]; | |
d8f8edbe JH |
126 | u8 remote_pk[64]; |
127 | u8 dhkey[32]; | |
760b018b | 128 | u8 mackey[16]; |
3b19146d | 129 | |
71af2f6b HX |
130 | struct crypto_skcipher *tfm_aes; |
131 | struct crypto_shash *tfm_cmac; | |
4bc58f51 JH |
132 | }; |
133 | ||
aeb7d461 JH |
134 | /* These debug key values are defined in the SMP section of the core |
135 | * specification. debug_pk is the public debug key and debug_sk the | |
136 | * private debug key. | |
137 | */ | |
138 | static const u8 debug_pk[64] = { | |
139 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
140 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
141 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
142 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20, | |
143 | ||
144 | 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74, | |
145 | 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76, | |
146 | 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63, | |
147 | 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc, | |
148 | }; | |
149 | ||
150 | static const u8 debug_sk[32] = { | |
151 | 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58, | |
152 | 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a, | |
153 | 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74, | |
154 | 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f, | |
155 | }; | |
156 | ||
8a2936f4 | 157 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 158 | { |
8a2936f4 | 159 | size_t i; |
d22ef0bc | 160 | |
8a2936f4 JH |
161 | for (i = 0; i < len; i++) |
162 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
163 | } |
164 | ||
06edf8de JH |
165 | /* The following functions map to the LE SC SMP crypto functions |
166 | * AES-CMAC, f4, f5, f6, g2 and h6. | |
167 | */ | |
168 | ||
71af2f6b | 169 | static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m, |
cbbbe3e2 JH |
170 | size_t len, u8 mac[16]) |
171 | { | |
172 | uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX]; | |
71af2f6b | 173 | SHASH_DESC_ON_STACK(desc, tfm); |
cbbbe3e2 JH |
174 | int err; |
175 | ||
176 | if (len > CMAC_MSG_MAX) | |
177 | return -EFBIG; | |
178 | ||
179 | if (!tfm) { | |
180 | BT_ERR("tfm %p", tfm); | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
71af2f6b HX |
184 | desc->tfm = tfm; |
185 | desc->flags = 0; | |
cbbbe3e2 JH |
186 | |
187 | /* Swap key and message from LSB to MSB */ | |
188 | swap_buf(k, tmp, 16); | |
189 | swap_buf(m, msg_msb, len); | |
190 | ||
c7a3d57d JH |
191 | SMP_DBG("msg (len %zu) %*phN", len, (int) len, m); |
192 | SMP_DBG("key %16phN", k); | |
cbbbe3e2 | 193 | |
71af2f6b | 194 | err = crypto_shash_setkey(tfm, tmp, 16); |
cbbbe3e2 JH |
195 | if (err) { |
196 | BT_ERR("cipher setkey failed: %d", err); | |
197 | return err; | |
198 | } | |
199 | ||
71af2f6b HX |
200 | err = crypto_shash_digest(desc, msg_msb, len, mac_msb); |
201 | shash_desc_zero(desc); | |
cbbbe3e2 | 202 | if (err) { |
71af2f6b | 203 | BT_ERR("Hash computation error %d", err); |
cbbbe3e2 JH |
204 | return err; |
205 | } | |
206 | ||
207 | swap_buf(mac_msb, mac, 16); | |
208 | ||
c7a3d57d | 209 | SMP_DBG("mac %16phN", mac); |
cbbbe3e2 JH |
210 | |
211 | return 0; | |
212 | } | |
213 | ||
71af2f6b HX |
214 | static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32], |
215 | const u8 v[32], const u8 x[16], u8 z, u8 res[16]) | |
cbbbe3e2 JH |
216 | { |
217 | u8 m[65]; | |
218 | int err; | |
219 | ||
c7a3d57d JH |
220 | SMP_DBG("u %32phN", u); |
221 | SMP_DBG("v %32phN", v); | |
222 | SMP_DBG("x %16phN z %02x", x, z); | |
cbbbe3e2 JH |
223 | |
224 | m[0] = z; | |
225 | memcpy(m + 1, v, 32); | |
226 | memcpy(m + 33, u, 32); | |
227 | ||
228 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), res); | |
229 | if (err) | |
230 | return err; | |
231 | ||
c7a3d57d | 232 | SMP_DBG("res %16phN", res); |
cbbbe3e2 JH |
233 | |
234 | return err; | |
235 | } | |
236 | ||
71af2f6b | 237 | static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32], |
4da50de8 JH |
238 | const u8 n1[16], const u8 n2[16], const u8 a1[7], |
239 | const u8 a2[7], u8 mackey[16], u8 ltk[16]) | |
760b018b JH |
240 | { |
241 | /* The btle, salt and length "magic" values are as defined in | |
242 | * the SMP section of the Bluetooth core specification. In ASCII | |
243 | * the btle value ends up being 'btle'. The salt is just a | |
244 | * random number whereas length is the value 256 in little | |
245 | * endian format. | |
246 | */ | |
247 | const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 }; | |
248 | const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60, | |
249 | 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c }; | |
250 | const u8 length[2] = { 0x00, 0x01 }; | |
251 | u8 m[53], t[16]; | |
252 | int err; | |
253 | ||
c7a3d57d JH |
254 | SMP_DBG("w %32phN", w); |
255 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
256 | SMP_DBG("a1 %7phN a2 %7phN", a1, a2); | |
760b018b JH |
257 | |
258 | err = aes_cmac(tfm_cmac, salt, w, 32, t); | |
259 | if (err) | |
260 | return err; | |
261 | ||
c7a3d57d | 262 | SMP_DBG("t %16phN", t); |
760b018b JH |
263 | |
264 | memcpy(m, length, 2); | |
265 | memcpy(m + 2, a2, 7); | |
266 | memcpy(m + 9, a1, 7); | |
267 | memcpy(m + 16, n2, 16); | |
268 | memcpy(m + 32, n1, 16); | |
269 | memcpy(m + 48, btle, 4); | |
270 | ||
271 | m[52] = 0; /* Counter */ | |
272 | ||
273 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey); | |
274 | if (err) | |
275 | return err; | |
276 | ||
c7a3d57d | 277 | SMP_DBG("mackey %16phN", mackey); |
760b018b JH |
278 | |
279 | m[52] = 1; /* Counter */ | |
280 | ||
281 | err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk); | |
282 | if (err) | |
283 | return err; | |
284 | ||
c7a3d57d | 285 | SMP_DBG("ltk %16phN", ltk); |
760b018b JH |
286 | |
287 | return 0; | |
288 | } | |
289 | ||
71af2f6b | 290 | static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16], |
4da50de8 | 291 | const u8 n1[16], const u8 n2[16], const u8 r[16], |
760b018b JH |
292 | const u8 io_cap[3], const u8 a1[7], const u8 a2[7], |
293 | u8 res[16]) | |
294 | { | |
295 | u8 m[65]; | |
296 | int err; | |
297 | ||
c7a3d57d JH |
298 | SMP_DBG("w %16phN", w); |
299 | SMP_DBG("n1 %16phN n2 %16phN", n1, n2); | |
300 | SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2); | |
760b018b JH |
301 | |
302 | memcpy(m, a2, 7); | |
303 | memcpy(m + 7, a1, 7); | |
304 | memcpy(m + 14, io_cap, 3); | |
305 | memcpy(m + 17, r, 16); | |
306 | memcpy(m + 33, n2, 16); | |
307 | memcpy(m + 49, n1, 16); | |
308 | ||
309 | err = aes_cmac(tfm_cmac, w, m, sizeof(m), res); | |
310 | if (err) | |
311 | return err; | |
312 | ||
203de21b | 313 | SMP_DBG("res %16phN", res); |
760b018b JH |
314 | |
315 | return err; | |
316 | } | |
317 | ||
71af2f6b | 318 | static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32], |
191dc7fe JH |
319 | const u8 x[16], const u8 y[16], u32 *val) |
320 | { | |
321 | u8 m[80], tmp[16]; | |
322 | int err; | |
323 | ||
c7a3d57d JH |
324 | SMP_DBG("u %32phN", u); |
325 | SMP_DBG("v %32phN", v); | |
326 | SMP_DBG("x %16phN y %16phN", x, y); | |
191dc7fe JH |
327 | |
328 | memcpy(m, y, 16); | |
329 | memcpy(m + 16, v, 32); | |
330 | memcpy(m + 48, u, 32); | |
331 | ||
332 | err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp); | |
333 | if (err) | |
334 | return err; | |
335 | ||
336 | *val = get_unaligned_le32(tmp); | |
337 | *val %= 1000000; | |
338 | ||
c7a3d57d | 339 | SMP_DBG("val %06u", *val); |
191dc7fe JH |
340 | |
341 | return 0; | |
342 | } | |
343 | ||
71af2f6b | 344 | static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16], |
06edf8de JH |
345 | const u8 key_id[4], u8 res[16]) |
346 | { | |
347 | int err; | |
348 | ||
349 | SMP_DBG("w %16phN key_id %4phN", w, key_id); | |
350 | ||
351 | err = aes_cmac(tfm_cmac, w, key_id, 4, res); | |
352 | if (err) | |
353 | return err; | |
354 | ||
355 | SMP_DBG("res %16phN", res); | |
356 | ||
357 | return err; | |
358 | } | |
359 | ||
360 | /* The following functions map to the legacy SMP crypto functions e, c1, | |
361 | * s1 and ah. | |
362 | */ | |
363 | ||
71af2f6b | 364 | static int smp_e(struct crypto_skcipher *tfm, const u8 *k, u8 *r) |
d22ef0bc | 365 | { |
71af2f6b | 366 | SKCIPHER_REQUEST_ON_STACK(req, tfm); |
d22ef0bc | 367 | struct scatterlist sg; |
943a732a | 368 | uint8_t tmp[16], data[16]; |
201a5929 | 369 | int err; |
d22ef0bc | 370 | |
011c391a JH |
371 | SMP_DBG("k %16phN r %16phN", k, r); |
372 | ||
7f376cd6 | 373 | if (!tfm) { |
d22ef0bc AB |
374 | BT_ERR("tfm %p", tfm); |
375 | return -EINVAL; | |
376 | } | |
377 | ||
943a732a | 378 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 379 | swap_buf(k, tmp, 16); |
943a732a | 380 | |
71af2f6b | 381 | err = crypto_skcipher_setkey(tfm, tmp, 16); |
d22ef0bc AB |
382 | if (err) { |
383 | BT_ERR("cipher setkey failed: %d", err); | |
384 | return err; | |
385 | } | |
386 | ||
943a732a | 387 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 388 | swap_buf(r, data, 16); |
943a732a JH |
389 | |
390 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 391 | |
71af2f6b HX |
392 | skcipher_request_set_tfm(req, tfm); |
393 | skcipher_request_set_callback(req, 0, NULL, NULL); | |
394 | skcipher_request_set_crypt(req, &sg, &sg, 16, NULL); | |
395 | ||
396 | err = crypto_skcipher_encrypt(req); | |
397 | skcipher_request_zero(req); | |
d22ef0bc AB |
398 | if (err) |
399 | BT_ERR("Encrypt data error %d", err); | |
400 | ||
943a732a | 401 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 402 | swap_buf(data, r, 16); |
943a732a | 403 | |
011c391a JH |
404 | SMP_DBG("r %16phN", r); |
405 | ||
d22ef0bc AB |
406 | return err; |
407 | } | |
408 | ||
71af2f6b | 409 | static int smp_c1(struct crypto_skcipher *tfm_aes, const u8 k[16], |
06edf8de JH |
410 | const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat, |
411 | const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16]) | |
6a77083a | 412 | { |
06edf8de | 413 | u8 p1[16], p2[16]; |
6a77083a JH |
414 | int err; |
415 | ||
011c391a JH |
416 | SMP_DBG("k %16phN r %16phN", k, r); |
417 | SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra); | |
418 | SMP_DBG("preq %7phN pres %7phN", preq, pres); | |
419 | ||
06edf8de | 420 | memset(p1, 0, 16); |
6a77083a | 421 | |
06edf8de JH |
422 | /* p1 = pres || preq || _rat || _iat */ |
423 | p1[0] = _iat; | |
424 | p1[1] = _rat; | |
425 | memcpy(p1 + 2, preq, 7); | |
426 | memcpy(p1 + 9, pres, 7); | |
427 | ||
011c391a | 428 | SMP_DBG("p1 %16phN", p1); |
06edf8de JH |
429 | |
430 | /* res = r XOR p1 */ | |
431 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
432 | ||
433 | /* res = e(k, res) */ | |
434 | err = smp_e(tfm_aes, k, res); | |
435 | if (err) { | |
436 | BT_ERR("Encrypt data error"); | |
6a77083a | 437 | return err; |
06edf8de | 438 | } |
6a77083a | 439 | |
011c391a JH |
440 | /* p2 = padding || ia || ra */ |
441 | memcpy(p2, ra, 6); | |
442 | memcpy(p2 + 6, ia, 6); | |
443 | memset(p2 + 12, 0, 4); | |
444 | ||
445 | SMP_DBG("p2 %16phN", p2); | |
446 | ||
06edf8de JH |
447 | /* res = res XOR p2 */ |
448 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
449 | ||
450 | /* res = e(k, res) */ | |
451 | err = smp_e(tfm_aes, k, res); | |
452 | if (err) | |
453 | BT_ERR("Encrypt data error"); | |
454 | ||
455 | return err; | |
456 | } | |
457 | ||
71af2f6b | 458 | static int smp_s1(struct crypto_skcipher *tfm_aes, const u8 k[16], |
06edf8de JH |
459 | const u8 r1[16], const u8 r2[16], u8 _r[16]) |
460 | { | |
461 | int err; | |
462 | ||
463 | /* Just least significant octets from r1 and r2 are considered */ | |
464 | memcpy(_r, r2, 8); | |
465 | memcpy(_r + 8, r1, 8); | |
466 | ||
467 | err = smp_e(tfm_aes, k, _r); | |
468 | if (err) | |
469 | BT_ERR("Encrypt data error"); | |
6a77083a JH |
470 | |
471 | return err; | |
472 | } | |
473 | ||
71af2f6b | 474 | static int smp_ah(struct crypto_skcipher *tfm, const u8 irk[16], |
cd082797 | 475 | const u8 r[3], u8 res[3]) |
60478054 | 476 | { |
943a732a | 477 | u8 _res[16]; |
60478054 JH |
478 | int err; |
479 | ||
480 | /* r' = padding || r */ | |
943a732a JH |
481 | memcpy(_res, r, 3); |
482 | memset(_res + 3, 0, 13); | |
60478054 | 483 | |
943a732a | 484 | err = smp_e(tfm, irk, _res); |
60478054 JH |
485 | if (err) { |
486 | BT_ERR("Encrypt error"); | |
487 | return err; | |
488 | } | |
489 | ||
490 | /* The output of the random address function ah is: | |
c5080d42 | 491 | * ah(k, r) = e(k, r') mod 2^24 |
60478054 JH |
492 | * The output of the security function e is then truncated to 24 bits |
493 | * by taking the least significant 24 bits of the output of e as the | |
494 | * result of ah. | |
495 | */ | |
943a732a | 496 | memcpy(res, _res, 3); |
60478054 JH |
497 | |
498 | return 0; | |
499 | } | |
500 | ||
cd082797 JH |
501 | bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], |
502 | const bdaddr_t *bdaddr) | |
60478054 | 503 | { |
defce9e8 | 504 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 505 | struct smp_dev *smp; |
60478054 JH |
506 | u8 hash[3]; |
507 | int err; | |
508 | ||
defce9e8 JH |
509 | if (!chan || !chan->data) |
510 | return false; | |
511 | ||
88a479d9 | 512 | smp = chan->data; |
defce9e8 | 513 | |
60478054 JH |
514 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
515 | ||
88a479d9 | 516 | err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash); |
60478054 JH |
517 | if (err) |
518 | return false; | |
519 | ||
520 | return !memcmp(bdaddr->b, hash, 3); | |
521 | } | |
522 | ||
cd082797 | 523 | int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 524 | { |
defce9e8 | 525 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 526 | struct smp_dev *smp; |
b1e2b3ae JH |
527 | int err; |
528 | ||
defce9e8 JH |
529 | if (!chan || !chan->data) |
530 | return -EOPNOTSUPP; | |
531 | ||
88a479d9 | 532 | smp = chan->data; |
defce9e8 | 533 | |
b1e2b3ae JH |
534 | get_random_bytes(&rpa->b[3], 3); |
535 | ||
536 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
537 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
538 | ||
88a479d9 | 539 | err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b); |
b1e2b3ae JH |
540 | if (err < 0) |
541 | return err; | |
542 | ||
543 | BT_DBG("RPA %pMR", rpa); | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
60a27d65 MH |
548 | int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]) |
549 | { | |
550 | struct l2cap_chan *chan = hdev->smp_data; | |
551 | struct smp_dev *smp; | |
552 | int err; | |
553 | ||
554 | if (!chan || !chan->data) | |
555 | return -EOPNOTSUPP; | |
556 | ||
557 | smp = chan->data; | |
558 | ||
559 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { | |
560 | BT_DBG("Using debug keys"); | |
561 | memcpy(smp->local_pk, debug_pk, 64); | |
562 | memcpy(smp->local_sk, debug_sk, 32); | |
563 | smp->debug_key = true; | |
564 | } else { | |
565 | while (true) { | |
566 | /* Generate local key pair for Secure Connections */ | |
567 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
568 | return -EIO; | |
569 | ||
570 | /* This is unlikely, but we need to check that | |
571 | * we didn't accidentially generate a debug key. | |
572 | */ | |
573 | if (memcmp(smp->local_sk, debug_sk, 32)) | |
574 | break; | |
575 | } | |
576 | smp->debug_key = false; | |
577 | } | |
578 | ||
579 | SMP_DBG("OOB Public Key X: %32phN", smp->local_pk); | |
580 | SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32); | |
581 | SMP_DBG("OOB Private Key: %32phN", smp->local_sk); | |
582 | ||
fb334fee | 583 | get_random_bytes(smp->local_rand, 16); |
60a27d65 MH |
584 | |
585 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk, | |
fb334fee | 586 | smp->local_rand, 0, hash); |
60a27d65 MH |
587 | if (err < 0) |
588 | return err; | |
589 | ||
fb334fee | 590 | memcpy(rand, smp->local_rand, 16); |
60a27d65 MH |
591 | |
592 | return 0; | |
593 | } | |
594 | ||
5d88cc73 | 595 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 596 | { |
5d88cc73 | 597 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 598 | struct smp_chan *smp; |
5d88cc73 JH |
599 | struct kvec iv[2]; |
600 | struct msghdr msg; | |
eb492e01 | 601 | |
5d88cc73 JH |
602 | if (!chan) |
603 | return; | |
eb492e01 | 604 | |
5d88cc73 | 605 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 606 | |
5d88cc73 JH |
607 | iv[0].iov_base = &code; |
608 | iv[0].iov_len = 1; | |
eb492e01 | 609 | |
5d88cc73 JH |
610 | iv[1].iov_base = data; |
611 | iv[1].iov_len = len; | |
eb492e01 | 612 | |
5d88cc73 | 613 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 614 | |
17836394 | 615 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len); |
eb492e01 | 616 | |
5d88cc73 | 617 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 618 | |
b68fda68 JH |
619 | if (!chan->data) |
620 | return; | |
621 | ||
622 | smp = chan->data; | |
623 | ||
624 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 625 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
626 | } |
627 | ||
d2eb9e10 | 628 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 629 | { |
d2eb9e10 JH |
630 | if (authreq & SMP_AUTH_MITM) { |
631 | if (authreq & SMP_AUTH_SC) | |
632 | return BT_SECURITY_FIPS; | |
633 | else | |
634 | return BT_SECURITY_HIGH; | |
635 | } else { | |
2b64d153 | 636 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 637 | } |
2b64d153 BG |
638 | } |
639 | ||
640 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
641 | { | |
642 | switch (sec_level) { | |
d2eb9e10 | 643 | case BT_SECURITY_FIPS: |
2b64d153 BG |
644 | case BT_SECURITY_HIGH: |
645 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
646 | case BT_SECURITY_MEDIUM: | |
647 | return SMP_AUTH_BONDING; | |
648 | default: | |
649 | return SMP_AUTH_NONE; | |
650 | } | |
651 | } | |
652 | ||
b8e66eac | 653 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
654 | struct smp_cmd_pairing *req, |
655 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 656 | { |
5d88cc73 JH |
657 | struct l2cap_chan *chan = conn->smp; |
658 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
659 | struct hci_conn *hcon = conn->hcon; |
660 | struct hci_dev *hdev = hcon->hdev; | |
02b05bd8 | 661 | u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT; |
54790f73 | 662 | |
d7a5a11d | 663 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
7ee4ea36 MH |
664 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
665 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 666 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
667 | } else { |
668 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
669 | } |
670 | ||
d7a5a11d | 671 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
fd349c02 JH |
672 | remote_dist |= SMP_DIST_ID_KEY; |
673 | ||
d7a5a11d | 674 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
863efaf2 JH |
675 | local_dist |= SMP_DIST_ID_KEY; |
676 | ||
d7a5a11d | 677 | if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) && |
02b05bd8 JH |
678 | (authreq & SMP_AUTH_SC)) { |
679 | struct oob_data *oob_data; | |
680 | u8 bdaddr_type; | |
681 | ||
d7a5a11d | 682 | if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) { |
df8e1a4c JH |
683 | local_dist |= SMP_DIST_LINK_KEY; |
684 | remote_dist |= SMP_DIST_LINK_KEY; | |
685 | } | |
02b05bd8 JH |
686 | |
687 | if (hcon->dst_type == ADDR_LE_DEV_PUBLIC) | |
688 | bdaddr_type = BDADDR_LE_PUBLIC; | |
689 | else | |
690 | bdaddr_type = BDADDR_LE_RANDOM; | |
691 | ||
692 | oob_data = hci_find_remote_oob_data(hdev, &hcon->dst, | |
693 | bdaddr_type); | |
4775a4ea | 694 | if (oob_data && oob_data->present) { |
1a8bab4f | 695 | set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags); |
02b05bd8 | 696 | oob_flag = SMP_OOB_PRESENT; |
a29b0733 | 697 | memcpy(smp->rr, oob_data->rand256, 16); |
02b05bd8 | 698 | memcpy(smp->pcnf, oob_data->hash256, 16); |
bc07cd69 MH |
699 | SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf); |
700 | SMP_DBG("OOB Remote Random: %16phN", smp->rr); | |
02b05bd8 JH |
701 | } |
702 | ||
df8e1a4c JH |
703 | } else { |
704 | authreq &= ~SMP_AUTH_SC; | |
705 | } | |
706 | ||
54790f73 VCG |
707 | if (rsp == NULL) { |
708 | req->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 709 | req->oob_flag = oob_flag; |
2fd36558 | 710 | req->max_key_size = SMP_DEV(hdev)->max_key_size; |
fd349c02 JH |
711 | req->init_key_dist = local_dist; |
712 | req->resp_key_dist = remote_dist; | |
0edb14de | 713 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
714 | |
715 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
716 | return; |
717 | } | |
718 | ||
719 | rsp->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 720 | rsp->oob_flag = oob_flag; |
2fd36558 | 721 | rsp->max_key_size = SMP_DEV(hdev)->max_key_size; |
fd349c02 JH |
722 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
723 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 724 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
725 | |
726 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
727 | } |
728 | ||
3158c50c VCG |
729 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
730 | { | |
5d88cc73 | 731 | struct l2cap_chan *chan = conn->smp; |
2fd36558 | 732 | struct hci_dev *hdev = conn->hcon->hdev; |
5d88cc73 | 733 | struct smp_chan *smp = chan->data; |
1c1def09 | 734 | |
2fd36558 JH |
735 | if (max_key_size > SMP_DEV(hdev)->max_key_size || |
736 | max_key_size < SMP_MIN_ENC_KEY_SIZE) | |
3158c50c VCG |
737 | return SMP_ENC_KEY_SIZE; |
738 | ||
f7aa611a | 739 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
740 | |
741 | return 0; | |
742 | } | |
743 | ||
6f48e260 JH |
744 | static void smp_chan_destroy(struct l2cap_conn *conn) |
745 | { | |
746 | struct l2cap_chan *chan = conn->smp; | |
747 | struct smp_chan *smp = chan->data; | |
923e2414 | 748 | struct hci_conn *hcon = conn->hcon; |
6f48e260 JH |
749 | bool complete; |
750 | ||
751 | BUG_ON(!smp); | |
752 | ||
753 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 754 | |
6f48e260 | 755 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
923e2414 | 756 | mgmt_smp_complete(hcon, complete); |
6f48e260 | 757 | |
276812ec MH |
758 | kzfree(smp->csrk); |
759 | kzfree(smp->slave_csrk); | |
760 | kzfree(smp->link_key); | |
6f48e260 | 761 | |
71af2f6b HX |
762 | crypto_free_skcipher(smp->tfm_aes); |
763 | crypto_free_shash(smp->tfm_cmac); | |
6f48e260 | 764 | |
923e2414 JH |
765 | /* Ensure that we don't leave any debug key around if debug key |
766 | * support hasn't been explicitly enabled. | |
767 | */ | |
768 | if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG && | |
d7a5a11d | 769 | !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) { |
923e2414 JH |
770 | list_del_rcu(&smp->ltk->list); |
771 | kfree_rcu(smp->ltk, rcu); | |
772 | smp->ltk = NULL; | |
773 | } | |
774 | ||
6f48e260 JH |
775 | /* If pairing failed clean up any keys we might have */ |
776 | if (!complete) { | |
777 | if (smp->ltk) { | |
970d0f1b JH |
778 | list_del_rcu(&smp->ltk->list); |
779 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
780 | } |
781 | ||
782 | if (smp->slave_ltk) { | |
970d0f1b JH |
783 | list_del_rcu(&smp->slave_ltk->list); |
784 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
785 | } |
786 | ||
787 | if (smp->remote_irk) { | |
adae20cb JH |
788 | list_del_rcu(&smp->remote_irk->list); |
789 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
790 | } |
791 | } | |
792 | ||
793 | chan->data = NULL; | |
276812ec | 794 | kzfree(smp); |
923e2414 | 795 | hci_conn_drop(hcon); |
6f48e260 JH |
796 | } |
797 | ||
84794e11 | 798 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 799 | { |
bab73cb6 | 800 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 801 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 802 | |
84794e11 | 803 | if (reason) |
4f957a76 | 804 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 805 | &reason); |
4f957a76 | 806 | |
e1e930f5 | 807 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 808 | |
fc75cc86 | 809 | if (chan->data) |
f1c09c07 | 810 | smp_chan_destroy(conn); |
4f957a76 BG |
811 | } |
812 | ||
2b64d153 BG |
813 | #define JUST_WORKS 0x00 |
814 | #define JUST_CFM 0x01 | |
815 | #define REQ_PASSKEY 0x02 | |
816 | #define CFM_PASSKEY 0x03 | |
817 | #define REQ_OOB 0x04 | |
5e3d3d9b | 818 | #define DSP_PASSKEY 0x05 |
2b64d153 BG |
819 | #define OVERLAP 0xFF |
820 | ||
821 | static const u8 gen_method[5][5] = { | |
822 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
823 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
824 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
825 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
826 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
827 | }; | |
828 | ||
5e3d3d9b JH |
829 | static const u8 sc_method[5][5] = { |
830 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
831 | { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
832 | { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY }, | |
833 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
834 | { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
835 | }; | |
836 | ||
581370cc JH |
837 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
838 | { | |
2bcd4003 JH |
839 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
840 | * converted later to JUST_WORKS if we're initiators. | |
841 | */ | |
581370cc JH |
842 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
843 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 844 | return JUST_CFM; |
581370cc | 845 | |
5e3d3d9b JH |
846 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
847 | return sc_method[remote_io][local_io]; | |
848 | ||
581370cc JH |
849 | return gen_method[remote_io][local_io]; |
850 | } | |
851 | ||
2b64d153 BG |
852 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
853 | u8 local_io, u8 remote_io) | |
854 | { | |
855 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
856 | struct l2cap_chan *chan = conn->smp; |
857 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
858 | u32 passkey = 0; |
859 | int ret = 0; | |
860 | ||
861 | /* Initialize key for JUST WORKS */ | |
862 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 863 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
864 | |
865 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
866 | ||
2bcd4003 JH |
867 | /* If neither side wants MITM, either "just" confirm an incoming |
868 | * request or use just-works for outgoing ones. The JUST_CFM | |
869 | * will be converted to JUST_WORKS if necessary later in this | |
870 | * function. If either side has MITM look up the method from the | |
871 | * table. | |
872 | */ | |
581370cc | 873 | if (!(auth & SMP_AUTH_MITM)) |
783e0574 | 874 | smp->method = JUST_CFM; |
2b64d153 | 875 | else |
783e0574 | 876 | smp->method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 877 | |
a82505c7 | 878 | /* Don't confirm locally initiated pairing attempts */ |
783e0574 JH |
879 | if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, |
880 | &smp->flags)) | |
881 | smp->method = JUST_WORKS; | |
a82505c7 | 882 | |
02f3e254 | 883 | /* Don't bother user space with no IO capabilities */ |
783e0574 JH |
884 | if (smp->method == JUST_CFM && |
885 | hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
886 | smp->method = JUST_WORKS; | |
02f3e254 | 887 | |
2b64d153 | 888 | /* If Just Works, Continue with Zero TK */ |
783e0574 | 889 | if (smp->method == JUST_WORKS) { |
4a74d658 | 890 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
891 | return 0; |
892 | } | |
893 | ||
19c5ce9c JH |
894 | /* If this function is used for SC -> legacy fallback we |
895 | * can only recover the just-works case. | |
896 | */ | |
897 | if (test_bit(SMP_FLAG_SC, &smp->flags)) | |
898 | return -EINVAL; | |
899 | ||
2b64d153 | 900 | /* Not Just Works/Confirm results in MITM Authentication */ |
783e0574 | 901 | if (smp->method != JUST_CFM) { |
4a74d658 | 902 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
903 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
904 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
905 | } | |
2b64d153 BG |
906 | |
907 | /* If both devices have Keyoard-Display I/O, the master | |
908 | * Confirms and the slave Enters the passkey. | |
909 | */ | |
783e0574 | 910 | if (smp->method == OVERLAP) { |
40bef302 | 911 | if (hcon->role == HCI_ROLE_MASTER) |
783e0574 | 912 | smp->method = CFM_PASSKEY; |
2b64d153 | 913 | else |
783e0574 | 914 | smp->method = REQ_PASSKEY; |
2b64d153 BG |
915 | } |
916 | ||
01ad34d2 | 917 | /* Generate random passkey. */ |
783e0574 | 918 | if (smp->method == CFM_PASSKEY) { |
943a732a | 919 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
920 | get_random_bytes(&passkey, sizeof(passkey)); |
921 | passkey %= 1000000; | |
943a732a | 922 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 923 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 924 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
925 | } |
926 | ||
783e0574 | 927 | if (smp->method == REQ_PASSKEY) |
ce39fb4e | 928 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 929 | hcon->type, hcon->dst_type); |
783e0574 | 930 | else if (smp->method == JUST_CFM) |
4eb65e66 JH |
931 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
932 | hcon->type, hcon->dst_type, | |
933 | passkey, 1); | |
2b64d153 | 934 | else |
01ad34d2 | 935 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 936 | hcon->type, hcon->dst_type, |
39adbffe | 937 | passkey, 0); |
2b64d153 | 938 | |
2b64d153 BG |
939 | return ret; |
940 | } | |
941 | ||
1cc61144 | 942 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 943 | { |
8aab4757 | 944 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
945 | struct smp_cmd_pairing_confirm cp; |
946 | int ret; | |
8aab4757 VCG |
947 | |
948 | BT_DBG("conn %p", conn); | |
949 | ||
e491eaf3 | 950 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 951 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
952 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
953 | cp.confirm_val); | |
1cc61144 JH |
954 | if (ret) |
955 | return SMP_UNSPECIFIED; | |
8aab4757 | 956 | |
4a74d658 | 957 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 958 | |
8aab4757 VCG |
959 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
960 | ||
b28b4943 JH |
961 | if (conn->hcon->out) |
962 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
963 | else | |
964 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
965 | ||
1cc61144 | 966 | return 0; |
8aab4757 VCG |
967 | } |
968 | ||
861580a9 | 969 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 970 | { |
8aab4757 VCG |
971 | struct l2cap_conn *conn = smp->conn; |
972 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 973 | u8 confirm[16]; |
8aab4757 VCG |
974 | int ret; |
975 | ||
ec70f36f | 976 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 977 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
978 | |
979 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
980 | ||
e491eaf3 | 981 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 982 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 983 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
984 | if (ret) |
985 | return SMP_UNSPECIFIED; | |
8aab4757 | 986 | |
8aab4757 VCG |
987 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
988 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 989 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
990 | } |
991 | ||
992 | if (hcon->out) { | |
fe39c7b2 MH |
993 | u8 stk[16]; |
994 | __le64 rand = 0; | |
995 | __le16 ediv = 0; | |
8aab4757 | 996 | |
e491eaf3 | 997 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 998 | |
861580a9 JH |
999 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
1000 | return SMP_UNSPECIFIED; | |
8aab4757 | 1001 | |
8b76ce34 | 1002 | hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size); |
f7aa611a | 1003 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 1004 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 1005 | } else { |
fff3490f | 1006 | u8 stk[16], auth; |
fe39c7b2 MH |
1007 | __le64 rand = 0; |
1008 | __le16 ediv = 0; | |
8aab4757 | 1009 | |
943a732a JH |
1010 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1011 | smp->prnd); | |
8aab4757 | 1012 | |
e491eaf3 | 1013 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 1014 | |
fff3490f JH |
1015 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
1016 | auth = 1; | |
1017 | else | |
1018 | auth = 0; | |
1019 | ||
7d5843b7 JH |
1020 | /* Even though there's no _SLAVE suffix this is the |
1021 | * slave STK we're adding for later lookup (the master | |
1022 | * STK never needs to be stored). | |
1023 | */ | |
ce39fb4e | 1024 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1025 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
1026 | } |
1027 | ||
861580a9 | 1028 | return 0; |
8aab4757 VCG |
1029 | } |
1030 | ||
44f1a7ab JH |
1031 | static void smp_notify_keys(struct l2cap_conn *conn) |
1032 | { | |
1033 | struct l2cap_chan *chan = conn->smp; | |
1034 | struct smp_chan *smp = chan->data; | |
1035 | struct hci_conn *hcon = conn->hcon; | |
1036 | struct hci_dev *hdev = hcon->hdev; | |
1037 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
1038 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1039 | bool persistent; | |
1040 | ||
cad20c27 JH |
1041 | if (hcon->type == ACL_LINK) { |
1042 | if (hcon->key_type == HCI_LK_DEBUG_COMBINATION) | |
1043 | persistent = false; | |
1044 | else | |
1045 | persistent = !test_bit(HCI_CONN_FLUSH_KEY, | |
1046 | &hcon->flags); | |
1047 | } else { | |
1048 | /* The LTKs, IRKs and CSRKs should be persistent only if | |
1049 | * both sides had the bonding bit set in their | |
1050 | * authentication requests. | |
1051 | */ | |
1052 | persistent = !!((req->auth_req & rsp->auth_req) & | |
1053 | SMP_AUTH_BONDING); | |
1054 | } | |
1055 | ||
44f1a7ab | 1056 | if (smp->remote_irk) { |
cad20c27 JH |
1057 | mgmt_new_irk(hdev, smp->remote_irk, persistent); |
1058 | ||
44f1a7ab JH |
1059 | /* Now that user space can be considered to know the |
1060 | * identity address track the connection based on it | |
b5ae344d | 1061 | * from now on (assuming this is an LE link). |
44f1a7ab | 1062 | */ |
b5ae344d JH |
1063 | if (hcon->type == LE_LINK) { |
1064 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1065 | hcon->dst_type = smp->remote_irk->addr_type; | |
1066 | queue_work(hdev->workqueue, &conn->id_addr_update_work); | |
1067 | } | |
44f1a7ab JH |
1068 | } |
1069 | ||
44f1a7ab JH |
1070 | if (smp->csrk) { |
1071 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1072 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
1073 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
1074 | } | |
1075 | ||
1076 | if (smp->slave_csrk) { | |
1077 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1078 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
1079 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
1080 | } | |
1081 | ||
1082 | if (smp->ltk) { | |
1083 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1084 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
1085 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
1086 | } | |
1087 | ||
1088 | if (smp->slave_ltk) { | |
1089 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1090 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
1091 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
1092 | } | |
6a77083a JH |
1093 | |
1094 | if (smp->link_key) { | |
e3befab9 JH |
1095 | struct link_key *key; |
1096 | u8 type; | |
1097 | ||
1098 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1099 | type = HCI_LK_DEBUG_COMBINATION; | |
1100 | else if (hcon->sec_level == BT_SECURITY_FIPS) | |
1101 | type = HCI_LK_AUTH_COMBINATION_P256; | |
1102 | else | |
1103 | type = HCI_LK_UNAUTH_COMBINATION_P256; | |
1104 | ||
1105 | key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst, | |
1106 | smp->link_key, type, 0, &persistent); | |
1107 | if (key) { | |
1108 | mgmt_new_link_key(hdev, key, persistent); | |
1109 | ||
1110 | /* Don't keep debug keys around if the relevant | |
1111 | * flag is not set. | |
1112 | */ | |
d7a5a11d | 1113 | if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) && |
e3befab9 JH |
1114 | key->type == HCI_LK_DEBUG_COMBINATION) { |
1115 | list_del_rcu(&key->list); | |
1116 | kfree_rcu(key, rcu); | |
1117 | } | |
1118 | } | |
6a77083a JH |
1119 | } |
1120 | } | |
1121 | ||
d3e54a87 JH |
1122 | static void sc_add_ltk(struct smp_chan *smp) |
1123 | { | |
1124 | struct hci_conn *hcon = smp->conn->hcon; | |
1125 | u8 key_type, auth; | |
1126 | ||
1127 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1128 | key_type = SMP_LTK_P256_DEBUG; | |
1129 | else | |
1130 | key_type = SMP_LTK_P256; | |
1131 | ||
1132 | if (hcon->pending_sec_level == BT_SECURITY_FIPS) | |
1133 | auth = 1; | |
1134 | else | |
1135 | auth = 0; | |
1136 | ||
d3e54a87 JH |
1137 | smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
1138 | key_type, auth, smp->tk, smp->enc_key_size, | |
1139 | 0, 0); | |
1140 | } | |
1141 | ||
6a77083a JH |
1142 | static void sc_generate_link_key(struct smp_chan *smp) |
1143 | { | |
1144 | /* These constants are as specified in the core specification. | |
1145 | * In ASCII they spell out to 'tmp1' and 'lebr'. | |
1146 | */ | |
1147 | const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1148 | const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
1149 | ||
1150 | smp->link_key = kzalloc(16, GFP_KERNEL); | |
1151 | if (!smp->link_key) | |
1152 | return; | |
1153 | ||
1154 | if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) { | |
276812ec | 1155 | kzfree(smp->link_key); |
6a77083a JH |
1156 | smp->link_key = NULL; |
1157 | return; | |
1158 | } | |
1159 | ||
1160 | if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) { | |
276812ec | 1161 | kzfree(smp->link_key); |
6a77083a JH |
1162 | smp->link_key = NULL; |
1163 | return; | |
1164 | } | |
44f1a7ab JH |
1165 | } |
1166 | ||
b28b4943 JH |
1167 | static void smp_allow_key_dist(struct smp_chan *smp) |
1168 | { | |
1169 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
1170 | * will be allowed in each PDU handler to ensure we receive | |
1171 | * them in the correct order. | |
1172 | */ | |
1173 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
1174 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
1175 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
1176 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
1177 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
1178 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1179 | } | |
1180 | ||
b5ae344d JH |
1181 | static void sc_generate_ltk(struct smp_chan *smp) |
1182 | { | |
1183 | /* These constants are as specified in the core specification. | |
1184 | * In ASCII they spell out to 'tmp2' and 'brle'. | |
1185 | */ | |
1186 | const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1187 | const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 }; | |
1188 | struct hci_conn *hcon = smp->conn->hcon; | |
1189 | struct hci_dev *hdev = hcon->hdev; | |
1190 | struct link_key *key; | |
1191 | ||
1192 | key = hci_find_link_key(hdev, &hcon->dst); | |
1193 | if (!key) { | |
1194 | BT_ERR("%s No Link Key found to generate LTK", hdev->name); | |
1195 | return; | |
1196 | } | |
1197 | ||
1198 | if (key->type == HCI_LK_DEBUG_COMBINATION) | |
1199 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1200 | ||
1201 | if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk)) | |
1202 | return; | |
1203 | ||
1204 | if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk)) | |
1205 | return; | |
1206 | ||
1207 | sc_add_ltk(smp); | |
1208 | } | |
1209 | ||
d6268e86 | 1210 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
1211 | { |
1212 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 1213 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
1214 | struct hci_conn *hcon = conn->hcon; |
1215 | struct hci_dev *hdev = hcon->hdev; | |
1216 | __u8 *keydist; | |
1217 | ||
1218 | BT_DBG("conn %p", conn); | |
1219 | ||
44f1a7ab JH |
1220 | rsp = (void *) &smp->prsp[1]; |
1221 | ||
1222 | /* The responder sends its keys first */ | |
b28b4943 JH |
1223 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
1224 | smp_allow_key_dist(smp); | |
86d1407c | 1225 | return; |
b28b4943 | 1226 | } |
44f1a7ab JH |
1227 | |
1228 | req = (void *) &smp->preq[1]; | |
1229 | ||
1230 | if (hcon->out) { | |
1231 | keydist = &rsp->init_key_dist; | |
1232 | *keydist &= req->init_key_dist; | |
1233 | } else { | |
1234 | keydist = &rsp->resp_key_dist; | |
1235 | *keydist &= req->resp_key_dist; | |
1236 | } | |
1237 | ||
6a77083a | 1238 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
b5ae344d | 1239 | if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY)) |
6a77083a | 1240 | sc_generate_link_key(smp); |
b5ae344d JH |
1241 | if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY)) |
1242 | sc_generate_ltk(smp); | |
6a77083a JH |
1243 | |
1244 | /* Clear the keys which are generated but not distributed */ | |
1245 | *keydist &= ~SMP_SC_NO_DIST; | |
1246 | } | |
1247 | ||
44f1a7ab JH |
1248 | BT_DBG("keydist 0x%x", *keydist); |
1249 | ||
1250 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1251 | struct smp_cmd_encrypt_info enc; | |
1252 | struct smp_cmd_master_ident ident; | |
1253 | struct smp_ltk *ltk; | |
1254 | u8 authenticated; | |
1255 | __le16 ediv; | |
1256 | __le64 rand; | |
1257 | ||
1fc62c52 JH |
1258 | /* Make sure we generate only the significant amount of |
1259 | * bytes based on the encryption key size, and set the rest | |
1260 | * of the value to zeroes. | |
1261 | */ | |
1262 | get_random_bytes(enc.ltk, smp->enc_key_size); | |
1263 | memset(enc.ltk + smp->enc_key_size, 0, | |
1264 | sizeof(enc.ltk) - smp->enc_key_size); | |
1265 | ||
44f1a7ab JH |
1266 | get_random_bytes(&ediv, sizeof(ediv)); |
1267 | get_random_bytes(&rand, sizeof(rand)); | |
1268 | ||
1269 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1270 | ||
1271 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
1272 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
1273 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
1274 | smp->enc_key_size, ediv, rand); | |
1275 | smp->slave_ltk = ltk; | |
1276 | ||
1277 | ident.ediv = ediv; | |
1278 | ident.rand = rand; | |
1279 | ||
1280 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1281 | ||
1282 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1283 | } | |
1284 | ||
1285 | if (*keydist & SMP_DIST_ID_KEY) { | |
1286 | struct smp_cmd_ident_addr_info addrinfo; | |
1287 | struct smp_cmd_ident_info idinfo; | |
1288 | ||
1289 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
1290 | ||
1291 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1292 | ||
1293 | /* The hci_conn contains the local identity address | |
1294 | * after the connection has been established. | |
1295 | * | |
1296 | * This is true even when the connection has been | |
1297 | * established using a resolvable random address. | |
1298 | */ | |
1299 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
1300 | addrinfo.addr_type = hcon->src_type; | |
1301 | ||
1302 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1303 | &addrinfo); | |
1304 | ||
1305 | *keydist &= ~SMP_DIST_ID_KEY; | |
1306 | } | |
1307 | ||
1308 | if (*keydist & SMP_DIST_SIGN) { | |
1309 | struct smp_cmd_sign_info sign; | |
1310 | struct smp_csrk *csrk; | |
1311 | ||
1312 | /* Generate a new random key */ | |
1313 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1314 | ||
1315 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1316 | if (csrk) { | |
4cd3928a JH |
1317 | if (hcon->sec_level > BT_SECURITY_MEDIUM) |
1318 | csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED; | |
1319 | else | |
1320 | csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED; | |
44f1a7ab JH |
1321 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); |
1322 | } | |
1323 | smp->slave_csrk = csrk; | |
1324 | ||
1325 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1326 | ||
1327 | *keydist &= ~SMP_DIST_SIGN; | |
1328 | } | |
1329 | ||
1330 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
1331 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
1332 | smp_allow_key_dist(smp); | |
86d1407c | 1333 | return; |
b28b4943 | 1334 | } |
44f1a7ab | 1335 | |
44f1a7ab JH |
1336 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1337 | smp_notify_keys(conn); | |
1338 | ||
1339 | smp_chan_destroy(conn); | |
44f1a7ab JH |
1340 | } |
1341 | ||
b68fda68 JH |
1342 | static void smp_timeout(struct work_struct *work) |
1343 | { | |
1344 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
1345 | security_timer.work); | |
1346 | struct l2cap_conn *conn = smp->conn; | |
1347 | ||
1348 | BT_DBG("conn %p", conn); | |
1349 | ||
1e91c29e | 1350 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
1351 | } |
1352 | ||
8aab4757 VCG |
1353 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
1354 | { | |
5d88cc73 | 1355 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
1356 | struct smp_chan *smp; |
1357 | ||
f1560463 | 1358 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 1359 | if (!smp) |
8aab4757 VCG |
1360 | return NULL; |
1361 | ||
71af2f6b | 1362 | smp->tfm_aes = crypto_alloc_skcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
6a7bd103 JH |
1363 | if (IS_ERR(smp->tfm_aes)) { |
1364 | BT_ERR("Unable to create ECB crypto context"); | |
276812ec | 1365 | kzfree(smp); |
6a7bd103 JH |
1366 | return NULL; |
1367 | } | |
1368 | ||
71af2f6b | 1369 | smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
407cecf6 JH |
1370 | if (IS_ERR(smp->tfm_cmac)) { |
1371 | BT_ERR("Unable to create CMAC crypto context"); | |
71af2f6b | 1372 | crypto_free_skcipher(smp->tfm_aes); |
276812ec | 1373 | kzfree(smp); |
407cecf6 JH |
1374 | return NULL; |
1375 | } | |
1376 | ||
8aab4757 | 1377 | smp->conn = conn; |
5d88cc73 | 1378 | chan->data = smp; |
8aab4757 | 1379 | |
b28b4943 JH |
1380 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
1381 | ||
b68fda68 JH |
1382 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
1383 | ||
8aab4757 VCG |
1384 | hci_conn_hold(conn->hcon); |
1385 | ||
1386 | return smp; | |
1387 | } | |
1388 | ||
760b018b JH |
1389 | static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16]) |
1390 | { | |
1391 | struct hci_conn *hcon = smp->conn->hcon; | |
1392 | u8 *na, *nb, a[7], b[7]; | |
1393 | ||
1394 | if (hcon->out) { | |
1395 | na = smp->prnd; | |
1396 | nb = smp->rrnd; | |
1397 | } else { | |
1398 | na = smp->rrnd; | |
1399 | nb = smp->prnd; | |
1400 | } | |
1401 | ||
1402 | memcpy(a, &hcon->init_addr, 6); | |
1403 | memcpy(b, &hcon->resp_addr, 6); | |
1404 | a[6] = hcon->init_addr_type; | |
1405 | b[6] = hcon->resp_addr_type; | |
1406 | ||
1407 | return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk); | |
1408 | } | |
1409 | ||
38606f14 | 1410 | static void sc_dhkey_check(struct smp_chan *smp) |
760b018b JH |
1411 | { |
1412 | struct hci_conn *hcon = smp->conn->hcon; | |
1413 | struct smp_cmd_dhkey_check check; | |
1414 | u8 a[7], b[7], *local_addr, *remote_addr; | |
1415 | u8 io_cap[3], r[16]; | |
1416 | ||
760b018b JH |
1417 | memcpy(a, &hcon->init_addr, 6); |
1418 | memcpy(b, &hcon->resp_addr, 6); | |
1419 | a[6] = hcon->init_addr_type; | |
1420 | b[6] = hcon->resp_addr_type; | |
1421 | ||
1422 | if (hcon->out) { | |
1423 | local_addr = a; | |
1424 | remote_addr = b; | |
1425 | memcpy(io_cap, &smp->preq[1], 3); | |
1426 | } else { | |
1427 | local_addr = b; | |
1428 | remote_addr = a; | |
1429 | memcpy(io_cap, &smp->prsp[1], 3); | |
1430 | } | |
1431 | ||
dddd3059 JH |
1432 | memset(r, 0, sizeof(r)); |
1433 | ||
1434 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
38606f14 | 1435 | put_unaligned_le32(hcon->passkey_notify, r); |
760b018b | 1436 | |
a29b0733 JH |
1437 | if (smp->method == REQ_OOB) |
1438 | memcpy(r, smp->rr, 16); | |
1439 | ||
760b018b JH |
1440 | smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap, |
1441 | local_addr, remote_addr, check.e); | |
1442 | ||
1443 | smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check); | |
dddd3059 JH |
1444 | } |
1445 | ||
38606f14 JH |
1446 | static u8 sc_passkey_send_confirm(struct smp_chan *smp) |
1447 | { | |
1448 | struct l2cap_conn *conn = smp->conn; | |
1449 | struct hci_conn *hcon = conn->hcon; | |
1450 | struct smp_cmd_pairing_confirm cfm; | |
1451 | u8 r; | |
1452 | ||
1453 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1454 | r |= 0x80; | |
1455 | ||
1456 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); | |
1457 | ||
1458 | if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r, | |
1459 | cfm.confirm_val)) | |
1460 | return SMP_UNSPECIFIED; | |
1461 | ||
1462 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
1463 | ||
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op) | |
1468 | { | |
1469 | struct l2cap_conn *conn = smp->conn; | |
1470 | struct hci_conn *hcon = conn->hcon; | |
1471 | struct hci_dev *hdev = hcon->hdev; | |
1472 | u8 cfm[16], r; | |
1473 | ||
1474 | /* Ignore the PDU if we've already done 20 rounds (0 - 19) */ | |
1475 | if (smp->passkey_round >= 20) | |
1476 | return 0; | |
1477 | ||
1478 | switch (smp_op) { | |
1479 | case SMP_CMD_PAIRING_RANDOM: | |
1480 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1481 | r |= 0x80; | |
1482 | ||
1483 | if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1484 | smp->rrnd, r, cfm)) | |
1485 | return SMP_UNSPECIFIED; | |
1486 | ||
1487 | if (memcmp(smp->pcnf, cfm, 16)) | |
1488 | return SMP_CONFIRM_FAILED; | |
1489 | ||
1490 | smp->passkey_round++; | |
1491 | ||
1492 | if (smp->passkey_round == 20) { | |
1493 | /* Generate MacKey and LTK */ | |
1494 | if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk)) | |
1495 | return SMP_UNSPECIFIED; | |
1496 | } | |
1497 | ||
1498 | /* The round is only complete when the initiator | |
1499 | * receives pairing random. | |
1500 | */ | |
1501 | if (!hcon->out) { | |
1502 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1503 | sizeof(smp->prnd), smp->prnd); | |
d3e54a87 | 1504 | if (smp->passkey_round == 20) |
38606f14 | 1505 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
d3e54a87 | 1506 | else |
38606f14 | 1507 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
38606f14 JH |
1508 | return 0; |
1509 | } | |
1510 | ||
1511 | /* Start the next round */ | |
1512 | if (smp->passkey_round != 20) | |
1513 | return sc_passkey_round(smp, 0); | |
1514 | ||
1515 | /* Passkey rounds are complete - start DHKey Check */ | |
1516 | sc_dhkey_check(smp); | |
1517 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1518 | ||
1519 | break; | |
1520 | ||
1521 | case SMP_CMD_PAIRING_CONFIRM: | |
1522 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
1523 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
1524 | return 0; | |
1525 | } | |
1526 | ||
1527 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1528 | ||
1529 | if (hcon->out) { | |
1530 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1531 | sizeof(smp->prnd), smp->prnd); | |
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | return sc_passkey_send_confirm(smp); | |
1536 | ||
1537 | case SMP_CMD_PUBLIC_KEY: | |
1538 | default: | |
1539 | /* Initiating device starts the round */ | |
1540 | if (!hcon->out) | |
1541 | return 0; | |
1542 | ||
1543 | BT_DBG("%s Starting passkey round %u", hdev->name, | |
1544 | smp->passkey_round + 1); | |
1545 | ||
1546 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1547 | ||
1548 | return sc_passkey_send_confirm(smp); | |
1549 | } | |
1550 | ||
1551 | return 0; | |
1552 | } | |
1553 | ||
dddd3059 JH |
1554 | static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey) |
1555 | { | |
38606f14 JH |
1556 | struct l2cap_conn *conn = smp->conn; |
1557 | struct hci_conn *hcon = conn->hcon; | |
1558 | u8 smp_op; | |
1559 | ||
1560 | clear_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
1561 | ||
dddd3059 JH |
1562 | switch (mgmt_op) { |
1563 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1564 | smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED); | |
1565 | return 0; | |
1566 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
1567 | smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED); | |
1568 | return 0; | |
38606f14 JH |
1569 | case MGMT_OP_USER_PASSKEY_REPLY: |
1570 | hcon->passkey_notify = le32_to_cpu(passkey); | |
1571 | smp->passkey_round = 0; | |
1572 | ||
1573 | if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) | |
1574 | smp_op = SMP_CMD_PAIRING_CONFIRM; | |
1575 | else | |
1576 | smp_op = 0; | |
1577 | ||
1578 | if (sc_passkey_round(smp, smp_op)) | |
1579 | return -EIO; | |
1580 | ||
1581 | return 0; | |
dddd3059 JH |
1582 | } |
1583 | ||
d3e54a87 JH |
1584 | /* Initiator sends DHKey check first */ |
1585 | if (hcon->out) { | |
1586 | sc_dhkey_check(smp); | |
1587 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1588 | } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) { | |
1589 | sc_dhkey_check(smp); | |
1590 | sc_add_ltk(smp); | |
1591 | } | |
760b018b JH |
1592 | |
1593 | return 0; | |
1594 | } | |
1595 | ||
2b64d153 BG |
1596 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
1597 | { | |
b10e8017 | 1598 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 1599 | struct l2cap_chan *chan; |
2b64d153 BG |
1600 | struct smp_chan *smp; |
1601 | u32 value; | |
fc75cc86 | 1602 | int err; |
2b64d153 BG |
1603 | |
1604 | BT_DBG(""); | |
1605 | ||
fc75cc86 | 1606 | if (!conn) |
2b64d153 BG |
1607 | return -ENOTCONN; |
1608 | ||
5d88cc73 JH |
1609 | chan = conn->smp; |
1610 | if (!chan) | |
1611 | return -ENOTCONN; | |
1612 | ||
fc75cc86 JH |
1613 | l2cap_chan_lock(chan); |
1614 | if (!chan->data) { | |
1615 | err = -ENOTCONN; | |
1616 | goto unlock; | |
1617 | } | |
1618 | ||
5d88cc73 | 1619 | smp = chan->data; |
2b64d153 | 1620 | |
760b018b JH |
1621 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1622 | err = sc_user_reply(smp, mgmt_op, passkey); | |
1623 | goto unlock; | |
1624 | } | |
1625 | ||
2b64d153 BG |
1626 | switch (mgmt_op) { |
1627 | case MGMT_OP_USER_PASSKEY_REPLY: | |
1628 | value = le32_to_cpu(passkey); | |
943a732a | 1629 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 1630 | BT_DBG("PassKey: %d", value); |
943a732a | 1631 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
1632 | /* Fall Through */ |
1633 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 1634 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
1635 | break; |
1636 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1637 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 1638 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1639 | err = 0; |
1640 | goto unlock; | |
2b64d153 | 1641 | default: |
84794e11 | 1642 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1643 | err = -EOPNOTSUPP; |
1644 | goto unlock; | |
2b64d153 BG |
1645 | } |
1646 | ||
fc75cc86 JH |
1647 | err = 0; |
1648 | ||
2b64d153 | 1649 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
1650 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
1651 | u8 rsp = smp_confirm(smp); | |
1652 | if (rsp) | |
1653 | smp_failure(conn, rsp); | |
1654 | } | |
2b64d153 | 1655 | |
fc75cc86 JH |
1656 | unlock: |
1657 | l2cap_chan_unlock(chan); | |
1658 | return err; | |
2b64d153 BG |
1659 | } |
1660 | ||
b5ae344d JH |
1661 | static void build_bredr_pairing_cmd(struct smp_chan *smp, |
1662 | struct smp_cmd_pairing *req, | |
1663 | struct smp_cmd_pairing *rsp) | |
1664 | { | |
1665 | struct l2cap_conn *conn = smp->conn; | |
1666 | struct hci_dev *hdev = conn->hcon->hdev; | |
1667 | u8 local_dist = 0, remote_dist = 0; | |
1668 | ||
d7a5a11d | 1669 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
b5ae344d JH |
1670 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
1671 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1672 | } | |
1673 | ||
d7a5a11d | 1674 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
b5ae344d JH |
1675 | remote_dist |= SMP_DIST_ID_KEY; |
1676 | ||
d7a5a11d | 1677 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
b5ae344d JH |
1678 | local_dist |= SMP_DIST_ID_KEY; |
1679 | ||
1680 | if (!rsp) { | |
1681 | memset(req, 0, sizeof(*req)); | |
1682 | ||
1683 | req->init_key_dist = local_dist; | |
1684 | req->resp_key_dist = remote_dist; | |
e3f6a257 | 1685 | req->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1686 | |
1687 | smp->remote_key_dist = remote_dist; | |
1688 | ||
1689 | return; | |
1690 | } | |
1691 | ||
1692 | memset(rsp, 0, sizeof(*rsp)); | |
1693 | ||
e3f6a257 | 1694 | rsp->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1695 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
1696 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
1697 | ||
1698 | smp->remote_key_dist = rsp->init_key_dist; | |
1699 | } | |
1700 | ||
da85e5e5 | 1701 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1702 | { |
3158c50c | 1703 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 1704 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 1705 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 1706 | struct smp_chan *smp; |
c7262e71 | 1707 | u8 key_size, auth, sec_level; |
8aab4757 | 1708 | int ret; |
88ba43b6 AB |
1709 | |
1710 | BT_DBG("conn %p", conn); | |
1711 | ||
c46b98be | 1712 | if (skb->len < sizeof(*req)) |
38e4a915 | 1713 | return SMP_INVALID_PARAMS; |
c46b98be | 1714 | |
40bef302 | 1715 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
1716 | return SMP_CMD_NOTSUPP; |
1717 | ||
fc75cc86 | 1718 | if (!chan->data) |
8aab4757 | 1719 | smp = smp_chan_create(conn); |
fc75cc86 | 1720 | else |
5d88cc73 | 1721 | smp = chan->data; |
8aab4757 | 1722 | |
d08fd0e7 AE |
1723 | if (!smp) |
1724 | return SMP_UNSPECIFIED; | |
d26a2345 | 1725 | |
c05b9339 | 1726 | /* We didn't start the pairing, so match remote */ |
0edb14de | 1727 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1728 | |
d7a5a11d | 1729 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 1730 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
1731 | return SMP_PAIRING_NOTSUPP; |
1732 | ||
d7a5a11d | 1733 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1734 | return SMP_AUTH_REQUIREMENTS; |
1735 | ||
1c1def09 VCG |
1736 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1737 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 1738 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 1739 | |
cb06d366 JH |
1740 | /* If the remote side's OOB flag is set it means it has |
1741 | * successfully received our local OOB data - therefore set the | |
1742 | * flag to indicate that local OOB is in use. | |
1743 | */ | |
58428563 JH |
1744 | if (req->oob_flag == SMP_OOB_PRESENT) |
1745 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1746 | ||
b5ae344d JH |
1747 | /* SMP over BR/EDR requires special treatment */ |
1748 | if (conn->hcon->type == ACL_LINK) { | |
1749 | /* We must have a BR/EDR SC link */ | |
08f63cc5 | 1750 | if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) && |
b7cb93e5 | 1751 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
1752 | return SMP_CROSS_TRANSP_NOT_ALLOWED; |
1753 | ||
1754 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1755 | ||
1756 | build_bredr_pairing_cmd(smp, req, &rsp); | |
1757 | ||
1758 | key_size = min(req->max_key_size, rsp.max_key_size); | |
1759 | if (check_enc_key_size(conn, key_size)) | |
1760 | return SMP_ENC_KEY_SIZE; | |
1761 | ||
1762 | /* Clear bits which are generated but not distributed */ | |
1763 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1764 | ||
1765 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; | |
1766 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
1767 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); | |
1768 | ||
1769 | smp_distribute_keys(smp); | |
1770 | return 0; | |
1771 | } | |
1772 | ||
5e3d3d9b JH |
1773 | build_pairing_cmd(conn, req, &rsp, auth); |
1774 | ||
1775 | if (rsp.auth_req & SMP_AUTH_SC) | |
1776 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1777 | ||
5be5e275 | 1778 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1779 | sec_level = BT_SECURITY_MEDIUM; |
1780 | else | |
1781 | sec_level = authreq_to_seclevel(auth); | |
1782 | ||
c7262e71 JH |
1783 | if (sec_level > conn->hcon->pending_sec_level) |
1784 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1785 | |
49c922bb | 1786 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1787 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1788 | u8 method; | |
1789 | ||
1790 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1791 | req->io_capability); | |
1792 | if (method == JUST_WORKS || method == JUST_CFM) | |
1793 | return SMP_AUTH_REQUIREMENTS; | |
1794 | } | |
1795 | ||
3158c50c VCG |
1796 | key_size = min(req->max_key_size, rsp.max_key_size); |
1797 | if (check_enc_key_size(conn, key_size)) | |
1798 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1799 | |
e84a6b13 | 1800 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1801 | |
1c1def09 VCG |
1802 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1803 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1804 | |
3158c50c | 1805 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1806 | |
1807 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1808 | ||
19c5ce9c JH |
1809 | /* Strictly speaking we shouldn't allow Pairing Confirm for the |
1810 | * SC case, however some implementations incorrectly copy RFU auth | |
1811 | * req bits from our security request, which may create a false | |
1812 | * positive SC enablement. | |
1813 | */ | |
1814 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1815 | ||
3b19146d JH |
1816 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1817 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1818 | /* Clear bits which are generated but not distributed */ | |
1819 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1820 | /* Wait for Public Key from Initiating Device */ | |
1821 | return 0; | |
3b19146d | 1822 | } |
da85e5e5 | 1823 | |
2b64d153 BG |
1824 | /* Request setup of TK */ |
1825 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1826 | if (ret) | |
1827 | return SMP_UNSPECIFIED; | |
1828 | ||
da85e5e5 | 1829 | return 0; |
88ba43b6 AB |
1830 | } |
1831 | ||
3b19146d JH |
1832 | static u8 sc_send_public_key(struct smp_chan *smp) |
1833 | { | |
70157ef5 JH |
1834 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
1835 | ||
3b19146d JH |
1836 | BT_DBG(""); |
1837 | ||
1a8bab4f | 1838 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { |
33d0c030 MH |
1839 | struct l2cap_chan *chan = hdev->smp_data; |
1840 | struct smp_dev *smp_dev; | |
1841 | ||
1842 | if (!chan || !chan->data) | |
1843 | return SMP_UNSPECIFIED; | |
1844 | ||
1845 | smp_dev = chan->data; | |
1846 | ||
1847 | memcpy(smp->local_pk, smp_dev->local_pk, 64); | |
1848 | memcpy(smp->local_sk, smp_dev->local_sk, 32); | |
fb334fee | 1849 | memcpy(smp->lr, smp_dev->local_rand, 16); |
33d0c030 MH |
1850 | |
1851 | if (smp_dev->debug_key) | |
1852 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1853 | ||
1854 | goto done; | |
1855 | } | |
1856 | ||
d7a5a11d | 1857 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { |
70157ef5 JH |
1858 | BT_DBG("Using debug keys"); |
1859 | memcpy(smp->local_pk, debug_pk, 64); | |
1860 | memcpy(smp->local_sk, debug_sk, 32); | |
1861 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1862 | } else { | |
1863 | while (true) { | |
1864 | /* Generate local key pair for Secure Connections */ | |
1865 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
1866 | return SMP_UNSPECIFIED; | |
6c0dcc50 | 1867 | |
70157ef5 JH |
1868 | /* This is unlikely, but we need to check that |
1869 | * we didn't accidentially generate a debug key. | |
1870 | */ | |
1871 | if (memcmp(smp->local_sk, debug_sk, 32)) | |
1872 | break; | |
1873 | } | |
6c0dcc50 | 1874 | } |
3b19146d | 1875 | |
33d0c030 | 1876 | done: |
c7a3d57d | 1877 | SMP_DBG("Local Public Key X: %32phN", smp->local_pk); |
8e4e2ee5 | 1878 | SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32); |
c7a3d57d | 1879 | SMP_DBG("Local Private Key: %32phN", smp->local_sk); |
3b19146d JH |
1880 | |
1881 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1882 | ||
1883 | return 0; | |
1884 | } | |
1885 | ||
da85e5e5 | 1886 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1887 | { |
3158c50c | 1888 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1889 | struct l2cap_chan *chan = conn->smp; |
1890 | struct smp_chan *smp = chan->data; | |
0edb14de | 1891 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1892 | u8 key_size, auth; |
7d24ddcc | 1893 | int ret; |
88ba43b6 AB |
1894 | |
1895 | BT_DBG("conn %p", conn); | |
1896 | ||
c46b98be | 1897 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1898 | return SMP_INVALID_PARAMS; |
c46b98be | 1899 | |
40bef302 | 1900 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1901 | return SMP_CMD_NOTSUPP; |
1902 | ||
3158c50c VCG |
1903 | skb_pull(skb, sizeof(*rsp)); |
1904 | ||
1c1def09 | 1905 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1906 | |
3158c50c VCG |
1907 | key_size = min(req->max_key_size, rsp->max_key_size); |
1908 | if (check_enc_key_size(conn, key_size)) | |
1909 | return SMP_ENC_KEY_SIZE; | |
1910 | ||
0edb14de | 1911 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1912 | |
d7a5a11d | 1913 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1914 | return SMP_AUTH_REQUIREMENTS; |
1915 | ||
cb06d366 JH |
1916 | /* If the remote side's OOB flag is set it means it has |
1917 | * successfully received our local OOB data - therefore set the | |
1918 | * flag to indicate that local OOB is in use. | |
1919 | */ | |
58428563 JH |
1920 | if (rsp->oob_flag == SMP_OOB_PRESENT) |
1921 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1922 | ||
b5ae344d JH |
1923 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1924 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
1925 | ||
1926 | /* Update remote key distribution in case the remote cleared | |
1927 | * some bits that we had enabled in our request. | |
1928 | */ | |
1929 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1930 | ||
1931 | /* For BR/EDR this means we're done and can start phase 3 */ | |
1932 | if (conn->hcon->type == ACL_LINK) { | |
1933 | /* Clear bits which are generated but not distributed */ | |
1934 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1935 | smp_distribute_keys(smp); | |
1936 | return 0; | |
1937 | } | |
1938 | ||
65668776 JH |
1939 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1940 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1941 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1942 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1943 | |
49c922bb | 1944 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1945 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1946 | u8 method; | |
1947 | ||
1948 | method = get_auth_method(smp, req->io_capability, | |
1949 | rsp->io_capability); | |
1950 | if (method == JUST_WORKS || method == JUST_CFM) | |
1951 | return SMP_AUTH_REQUIREMENTS; | |
1952 | } | |
1953 | ||
e84a6b13 | 1954 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1955 | |
fdcc4bec JH |
1956 | /* Update remote key distribution in case the remote cleared |
1957 | * some bits that we had enabled in our request. | |
1958 | */ | |
1959 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1960 | ||
3b19146d JH |
1961 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1962 | /* Clear bits which are generated but not distributed */ | |
1963 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1964 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1965 | return sc_send_public_key(smp); | |
1966 | } | |
1967 | ||
c05b9339 | 1968 | auth |= req->auth_req; |
2b64d153 | 1969 | |
476585ec | 1970 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1971 | if (ret) |
1972 | return SMP_UNSPECIFIED; | |
1973 | ||
4a74d658 | 1974 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1975 | |
1976 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1977 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1978 | return smp_confirm(smp); |
da85e5e5 VCG |
1979 | |
1980 | return 0; | |
88ba43b6 AB |
1981 | } |
1982 | ||
dcee2b32 JH |
1983 | static u8 sc_check_confirm(struct smp_chan *smp) |
1984 | { | |
1985 | struct l2cap_conn *conn = smp->conn; | |
1986 | ||
1987 | BT_DBG(""); | |
1988 | ||
38606f14 JH |
1989 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
1990 | return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM); | |
1991 | ||
dcee2b32 JH |
1992 | if (conn->hcon->out) { |
1993 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1994 | smp->prnd); | |
1995 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1996 | } | |
1997 | ||
1998 | return 0; | |
1999 | } | |
2000 | ||
19c5ce9c JH |
2001 | /* Work-around for some implementations that incorrectly copy RFU bits |
2002 | * from our security request and thereby create the impression that | |
2003 | * we're doing SC when in fact the remote doesn't support it. | |
2004 | */ | |
2005 | static int fixup_sc_false_positive(struct smp_chan *smp) | |
2006 | { | |
2007 | struct l2cap_conn *conn = smp->conn; | |
2008 | struct hci_conn *hcon = conn->hcon; | |
2009 | struct hci_dev *hdev = hcon->hdev; | |
2010 | struct smp_cmd_pairing *req, *rsp; | |
2011 | u8 auth; | |
2012 | ||
2013 | /* The issue is only observed when we're in slave role */ | |
2014 | if (hcon->out) | |
2015 | return SMP_UNSPECIFIED; | |
2016 | ||
2017 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) { | |
2018 | BT_ERR("Refusing SMP SC -> legacy fallback in SC-only mode"); | |
2019 | return SMP_UNSPECIFIED; | |
2020 | } | |
2021 | ||
2022 | BT_ERR("Trying to fall back to legacy SMP"); | |
2023 | ||
2024 | req = (void *) &smp->preq[1]; | |
2025 | rsp = (void *) &smp->prsp[1]; | |
2026 | ||
2027 | /* Rebuild key dist flags which may have been cleared for SC */ | |
2028 | smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist); | |
2029 | ||
2030 | auth = req->auth_req & AUTH_REQ_MASK(hdev); | |
2031 | ||
2032 | if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) { | |
2033 | BT_ERR("Failed to fall back to legacy SMP"); | |
2034 | return SMP_UNSPECIFIED; | |
2035 | } | |
2036 | ||
2037 | clear_bit(SMP_FLAG_SC, &smp->flags); | |
2038 | ||
2039 | return 0; | |
2040 | } | |
2041 | ||
da85e5e5 | 2042 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2043 | { |
5d88cc73 JH |
2044 | struct l2cap_chan *chan = conn->smp; |
2045 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 2046 | |
88ba43b6 AB |
2047 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
2048 | ||
c46b98be | 2049 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 2050 | return SMP_INVALID_PARAMS; |
c46b98be | 2051 | |
1c1def09 VCG |
2052 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
2053 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 2054 | |
19c5ce9c JH |
2055 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2056 | int ret; | |
2057 | ||
2058 | /* Public Key exchange must happen before any other steps */ | |
2059 | if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags)) | |
2060 | return sc_check_confirm(smp); | |
2061 | ||
2062 | BT_ERR("Unexpected SMP Pairing Confirm"); | |
2063 | ||
2064 | ret = fixup_sc_false_positive(smp); | |
2065 | if (ret) | |
2066 | return ret; | |
2067 | } | |
dcee2b32 | 2068 | |
b28b4943 | 2069 | if (conn->hcon->out) { |
943a732a JH |
2070 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
2071 | smp->prnd); | |
b28b4943 JH |
2072 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 2077 | return smp_confirm(smp); |
983f9814 MH |
2078 | |
2079 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
da85e5e5 VCG |
2080 | |
2081 | return 0; | |
88ba43b6 AB |
2082 | } |
2083 | ||
da85e5e5 | 2084 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2085 | { |
5d88cc73 JH |
2086 | struct l2cap_chan *chan = conn->smp; |
2087 | struct smp_chan *smp = chan->data; | |
191dc7fe JH |
2088 | struct hci_conn *hcon = conn->hcon; |
2089 | u8 *pkax, *pkbx, *na, *nb; | |
2090 | u32 passkey; | |
2091 | int err; | |
7d24ddcc | 2092 | |
8aab4757 | 2093 | BT_DBG("conn %p", conn); |
3158c50c | 2094 | |
c46b98be | 2095 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 2096 | return SMP_INVALID_PARAMS; |
c46b98be | 2097 | |
943a732a | 2098 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 2099 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 2100 | |
191dc7fe JH |
2101 | if (!test_bit(SMP_FLAG_SC, &smp->flags)) |
2102 | return smp_random(smp); | |
2103 | ||
580039e8 JH |
2104 | if (hcon->out) { |
2105 | pkax = smp->local_pk; | |
2106 | pkbx = smp->remote_pk; | |
2107 | na = smp->prnd; | |
2108 | nb = smp->rrnd; | |
2109 | } else { | |
2110 | pkax = smp->remote_pk; | |
2111 | pkbx = smp->local_pk; | |
2112 | na = smp->rrnd; | |
2113 | nb = smp->prnd; | |
2114 | } | |
2115 | ||
a29b0733 JH |
2116 | if (smp->method == REQ_OOB) { |
2117 | if (!hcon->out) | |
2118 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2119 | sizeof(smp->prnd), smp->prnd); | |
2120 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
2121 | goto mackey_and_ltk; | |
2122 | } | |
2123 | ||
38606f14 JH |
2124 | /* Passkey entry has special treatment */ |
2125 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
2126 | return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM); | |
2127 | ||
191dc7fe JH |
2128 | if (hcon->out) { |
2129 | u8 cfm[16]; | |
2130 | ||
2131 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
2132 | smp->rrnd, 0, cfm); | |
2133 | if (err) | |
2134 | return SMP_UNSPECIFIED; | |
2135 | ||
2136 | if (memcmp(smp->pcnf, cfm, 16)) | |
2137 | return SMP_CONFIRM_FAILED; | |
191dc7fe JH |
2138 | } else { |
2139 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2140 | smp->prnd); | |
2141 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
191dc7fe JH |
2142 | } |
2143 | ||
a29b0733 | 2144 | mackey_and_ltk: |
760b018b JH |
2145 | /* Generate MacKey and LTK */ |
2146 | err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk); | |
2147 | if (err) | |
2148 | return SMP_UNSPECIFIED; | |
2149 | ||
a29b0733 | 2150 | if (smp->method == JUST_WORKS || smp->method == REQ_OOB) { |
dddd3059 | 2151 | if (hcon->out) { |
38606f14 | 2152 | sc_dhkey_check(smp); |
dddd3059 JH |
2153 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
2154 | } | |
2155 | return 0; | |
2156 | } | |
2157 | ||
38606f14 JH |
2158 | err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey); |
2159 | if (err) | |
2160 | return SMP_UNSPECIFIED; | |
2161 | ||
2162 | err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type, | |
2163 | hcon->dst_type, passkey, 0); | |
191dc7fe JH |
2164 | if (err) |
2165 | return SMP_UNSPECIFIED; | |
2166 | ||
38606f14 JH |
2167 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2168 | ||
191dc7fe | 2169 | return 0; |
88ba43b6 AB |
2170 | } |
2171 | ||
f81cd823 | 2172 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 2173 | { |
c9839a11 | 2174 | struct smp_ltk *key; |
988c5997 VCG |
2175 | struct hci_conn *hcon = conn->hcon; |
2176 | ||
f3a73d97 | 2177 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 2178 | if (!key) |
f81cd823 | 2179 | return false; |
988c5997 | 2180 | |
a6f7833c | 2181 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 2182 | return false; |
4dab7864 | 2183 | |
51a8efd7 | 2184 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 2185 | return true; |
988c5997 | 2186 | |
8b76ce34 | 2187 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size); |
c9839a11 | 2188 | hcon->enc_key_size = key->enc_size; |
988c5997 | 2189 | |
fe59a05f JH |
2190 | /* We never store STKs for master role, so clear this flag */ |
2191 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
2192 | ||
f81cd823 | 2193 | return true; |
988c5997 | 2194 | } |
f1560463 | 2195 | |
35dc6f83 JH |
2196 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
2197 | enum smp_key_pref key_pref) | |
854f4727 JH |
2198 | { |
2199 | if (sec_level == BT_SECURITY_LOW) | |
2200 | return true; | |
2201 | ||
35dc6f83 JH |
2202 | /* If we're encrypted with an STK but the caller prefers using |
2203 | * LTK claim insufficient security. This way we allow the | |
2204 | * connection to be re-encrypted with an LTK, even if the LTK | |
2205 | * provides the same level of security. Only exception is if we | |
2206 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 2207 | */ |
35dc6f83 JH |
2208 | if (key_pref == SMP_USE_LTK && |
2209 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 2210 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
2211 | return false; |
2212 | ||
854f4727 JH |
2213 | if (hcon->sec_level >= sec_level) |
2214 | return true; | |
2215 | ||
2216 | return false; | |
2217 | } | |
2218 | ||
da85e5e5 | 2219 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
2220 | { |
2221 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
2222 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 2223 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 2224 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 2225 | struct smp_chan *smp; |
c05b9339 | 2226 | u8 sec_level, auth; |
88ba43b6 AB |
2227 | |
2228 | BT_DBG("conn %p", conn); | |
2229 | ||
c46b98be | 2230 | if (skb->len < sizeof(*rp)) |
38e4a915 | 2231 | return SMP_INVALID_PARAMS; |
c46b98be | 2232 | |
40bef302 | 2233 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
2234 | return SMP_CMD_NOTSUPP; |
2235 | ||
0edb14de | 2236 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 2237 | |
d7a5a11d | 2238 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
2239 | return SMP_AUTH_REQUIREMENTS; |
2240 | ||
5be5e275 | 2241 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
2242 | sec_level = BT_SECURITY_MEDIUM; |
2243 | else | |
2244 | sec_level = authreq_to_seclevel(auth); | |
2245 | ||
35dc6f83 | 2246 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
854f4727 JH |
2247 | return 0; |
2248 | ||
c7262e71 JH |
2249 | if (sec_level > hcon->pending_sec_level) |
2250 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 2251 | |
4dab7864 | 2252 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
2253 | return 0; |
2254 | ||
8aab4757 | 2255 | smp = smp_chan_create(conn); |
c29d2444 JH |
2256 | if (!smp) |
2257 | return SMP_UNSPECIFIED; | |
d26a2345 | 2258 | |
d7a5a11d | 2259 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 2260 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
2261 | return SMP_PAIRING_NOTSUPP; |
2262 | ||
88ba43b6 | 2263 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 2264 | |
da85e5e5 | 2265 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 2266 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 2267 | |
1c1def09 VCG |
2268 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2269 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2270 | |
88ba43b6 | 2271 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2272 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 2273 | |
da85e5e5 | 2274 | return 0; |
88ba43b6 AB |
2275 | } |
2276 | ||
cc110922 | 2277 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 2278 | { |
cc110922 | 2279 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 2280 | struct l2cap_chan *chan; |
0a66cf20 | 2281 | struct smp_chan *smp; |
2b64d153 | 2282 | __u8 authreq; |
fc75cc86 | 2283 | int ret; |
eb492e01 | 2284 | |
3a0259bb VCG |
2285 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
2286 | ||
0a66cf20 JH |
2287 | /* This may be NULL if there's an unexpected disconnection */ |
2288 | if (!conn) | |
2289 | return 1; | |
2290 | ||
d7a5a11d | 2291 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) |
2e65c9d2 AG |
2292 | return 1; |
2293 | ||
35dc6f83 | 2294 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 2295 | return 1; |
f1cb9af5 | 2296 | |
c7262e71 JH |
2297 | if (sec_level > hcon->pending_sec_level) |
2298 | hcon->pending_sec_level = sec_level; | |
2299 | ||
40bef302 | 2300 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
2301 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
2302 | return 0; | |
d26a2345 | 2303 | |
d8949aad JH |
2304 | chan = conn->smp; |
2305 | if (!chan) { | |
2306 | BT_ERR("SMP security requested but not available"); | |
2307 | return 1; | |
2308 | } | |
2309 | ||
fc75cc86 JH |
2310 | l2cap_chan_lock(chan); |
2311 | ||
2312 | /* If SMP is already in progress ignore this request */ | |
2313 | if (chan->data) { | |
2314 | ret = 0; | |
2315 | goto unlock; | |
2316 | } | |
d26a2345 | 2317 | |
8aab4757 | 2318 | smp = smp_chan_create(conn); |
fc75cc86 JH |
2319 | if (!smp) { |
2320 | ret = 1; | |
2321 | goto unlock; | |
2322 | } | |
2b64d153 BG |
2323 | |
2324 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 2325 | |
d7a5a11d | 2326 | if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) |
d2eb9e10 JH |
2327 | authreq |= SMP_AUTH_SC; |
2328 | ||
79897d20 JH |
2329 | /* Require MITM if IO Capability allows or the security level |
2330 | * requires it. | |
2e233644 | 2331 | */ |
79897d20 | 2332 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 2333 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
2334 | authreq |= SMP_AUTH_MITM; |
2335 | ||
40bef302 | 2336 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 2337 | struct smp_cmd_pairing cp; |
f01ead31 | 2338 | |
2b64d153 | 2339 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
2340 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2341 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2342 | |
eb492e01 | 2343 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2344 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
2345 | } else { |
2346 | struct smp_cmd_security_req cp; | |
2b64d153 | 2347 | cp.auth_req = authreq; |
eb492e01 | 2348 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 2349 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
2350 | } |
2351 | ||
4a74d658 | 2352 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 2353 | ret = 0; |
edca792c | 2354 | |
fc75cc86 JH |
2355 | unlock: |
2356 | l2cap_chan_unlock(chan); | |
2357 | return ret; | |
eb492e01 AB |
2358 | } |
2359 | ||
c81d555a JH |
2360 | void smp_cancel_pairing(struct hci_conn *hcon) |
2361 | { | |
2362 | struct l2cap_conn *conn = hcon->l2cap_data; | |
2363 | struct l2cap_chan *chan; | |
2364 | struct smp_chan *smp; | |
2365 | ||
2366 | if (!conn) | |
2367 | return; | |
2368 | ||
2369 | chan = conn->smp; | |
2370 | if (!chan) | |
2371 | return; | |
2372 | ||
2373 | l2cap_chan_lock(chan); | |
2374 | ||
2375 | smp = chan->data; | |
2376 | if (smp) { | |
2377 | if (test_bit(SMP_FLAG_COMPLETE, &smp->flags)) | |
2378 | smp_failure(conn, 0); | |
2379 | else | |
2380 | smp_failure(conn, SMP_UNSPECIFIED); | |
2381 | } | |
2382 | ||
2383 | l2cap_chan_unlock(chan); | |
2384 | } | |
2385 | ||
7034b911 VCG |
2386 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2387 | { | |
16b90839 | 2388 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
2389 | struct l2cap_chan *chan = conn->smp; |
2390 | struct smp_chan *smp = chan->data; | |
16b90839 | 2391 | |
c46b98be JH |
2392 | BT_DBG("conn %p", conn); |
2393 | ||
2394 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2395 | return SMP_INVALID_PARAMS; |
c46b98be | 2396 | |
b28b4943 | 2397 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 2398 | |
16b90839 VCG |
2399 | skb_pull(skb, sizeof(*rp)); |
2400 | ||
1c1def09 | 2401 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 2402 | |
7034b911 VCG |
2403 | return 0; |
2404 | } | |
2405 | ||
2406 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
2407 | { | |
16b90839 | 2408 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
2409 | struct l2cap_chan *chan = conn->smp; |
2410 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
2411 | struct hci_dev *hdev = conn->hcon->hdev; |
2412 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 2413 | struct smp_ltk *ltk; |
c9839a11 | 2414 | u8 authenticated; |
16b90839 | 2415 | |
c46b98be JH |
2416 | BT_DBG("conn %p", conn); |
2417 | ||
2418 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2419 | return SMP_INVALID_PARAMS; |
c46b98be | 2420 | |
9747a9f3 JH |
2421 | /* Mark the information as received */ |
2422 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
2423 | ||
b28b4943 JH |
2424 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
2425 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
2426 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
2427 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 2428 | |
16b90839 | 2429 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 2430 | |
ce39fb4e | 2431 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 2432 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
2433 | authenticated, smp->tk, smp->enc_key_size, |
2434 | rp->ediv, rp->rand); | |
2435 | smp->ltk = ltk; | |
c6e81e9a | 2436 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 2437 | smp_distribute_keys(smp); |
7034b911 VCG |
2438 | |
2439 | return 0; | |
2440 | } | |
2441 | ||
fd349c02 JH |
2442 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2443 | { | |
2444 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
2445 | struct l2cap_chan *chan = conn->smp; |
2446 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2447 | |
2448 | BT_DBG(""); | |
2449 | ||
2450 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2451 | return SMP_INVALID_PARAMS; |
fd349c02 | 2452 | |
b28b4943 | 2453 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 2454 | |
fd349c02 JH |
2455 | skb_pull(skb, sizeof(*info)); |
2456 | ||
2457 | memcpy(smp->irk, info->irk, 16); | |
2458 | ||
2459 | return 0; | |
2460 | } | |
2461 | ||
2462 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
2463 | struct sk_buff *skb) | |
2464 | { | |
2465 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
2466 | struct l2cap_chan *chan = conn->smp; |
2467 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2468 | struct hci_conn *hcon = conn->hcon; |
2469 | bdaddr_t rpa; | |
2470 | ||
2471 | BT_DBG(""); | |
2472 | ||
2473 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2474 | return SMP_INVALID_PARAMS; |
fd349c02 | 2475 | |
9747a9f3 JH |
2476 | /* Mark the information as received */ |
2477 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
2478 | ||
b28b4943 JH |
2479 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
2480 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
2481 | ||
fd349c02 JH |
2482 | skb_pull(skb, sizeof(*info)); |
2483 | ||
a9a58f86 JH |
2484 | /* Strictly speaking the Core Specification (4.1) allows sending |
2485 | * an empty address which would force us to rely on just the IRK | |
2486 | * as "identity information". However, since such | |
2487 | * implementations are not known of and in order to not over | |
2488 | * complicate our implementation, simply pretend that we never | |
2489 | * received an IRK for such a device. | |
e12af489 JH |
2490 | * |
2491 | * The Identity Address must also be a Static Random or Public | |
2492 | * Address, which hci_is_identity_address() checks for. | |
a9a58f86 | 2493 | */ |
e12af489 JH |
2494 | if (!bacmp(&info->bdaddr, BDADDR_ANY) || |
2495 | !hci_is_identity_address(&info->bdaddr, info->addr_type)) { | |
a9a58f86 | 2496 | BT_ERR("Ignoring IRK with no identity address"); |
31dd624e | 2497 | goto distribute; |
a9a58f86 JH |
2498 | } |
2499 | ||
fd349c02 JH |
2500 | bacpy(&smp->id_addr, &info->bdaddr); |
2501 | smp->id_addr_type = info->addr_type; | |
2502 | ||
2503 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
2504 | bacpy(&rpa, &hcon->dst); | |
2505 | else | |
2506 | bacpy(&rpa, BDADDR_ANY); | |
2507 | ||
23d0e128 JH |
2508 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
2509 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 2510 | |
31dd624e | 2511 | distribute: |
c6e81e9a JH |
2512 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
2513 | smp_distribute_keys(smp); | |
fd349c02 JH |
2514 | |
2515 | return 0; | |
2516 | } | |
2517 | ||
7ee4ea36 MH |
2518 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2519 | { | |
2520 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
2521 | struct l2cap_chan *chan = conn->smp; |
2522 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
2523 | struct smp_csrk *csrk; |
2524 | ||
2525 | BT_DBG("conn %p", conn); | |
2526 | ||
2527 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2528 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 2529 | |
7ee4ea36 MH |
2530 | /* Mark the information as received */ |
2531 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
2532 | ||
2533 | skb_pull(skb, sizeof(*rp)); | |
2534 | ||
7ee4ea36 MH |
2535 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
2536 | if (csrk) { | |
4cd3928a JH |
2537 | if (conn->hcon->sec_level > BT_SECURITY_MEDIUM) |
2538 | csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED; | |
2539 | else | |
2540 | csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED; | |
7ee4ea36 MH |
2541 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); |
2542 | } | |
2543 | smp->csrk = csrk; | |
d6268e86 | 2544 | smp_distribute_keys(smp); |
7ee4ea36 MH |
2545 | |
2546 | return 0; | |
2547 | } | |
2548 | ||
5e3d3d9b JH |
2549 | static u8 sc_select_method(struct smp_chan *smp) |
2550 | { | |
2551 | struct l2cap_conn *conn = smp->conn; | |
2552 | struct hci_conn *hcon = conn->hcon; | |
2553 | struct smp_cmd_pairing *local, *remote; | |
2554 | u8 local_mitm, remote_mitm, local_io, remote_io, method; | |
2555 | ||
1a8bab4f JH |
2556 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) || |
2557 | test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) | |
a29b0733 JH |
2558 | return REQ_OOB; |
2559 | ||
5e3d3d9b JH |
2560 | /* The preq/prsp contain the raw Pairing Request/Response PDUs |
2561 | * which are needed as inputs to some crypto functions. To get | |
2562 | * the "struct smp_cmd_pairing" from them we need to skip the | |
2563 | * first byte which contains the opcode. | |
2564 | */ | |
2565 | if (hcon->out) { | |
2566 | local = (void *) &smp->preq[1]; | |
2567 | remote = (void *) &smp->prsp[1]; | |
2568 | } else { | |
2569 | local = (void *) &smp->prsp[1]; | |
2570 | remote = (void *) &smp->preq[1]; | |
2571 | } | |
2572 | ||
2573 | local_io = local->io_capability; | |
2574 | remote_io = remote->io_capability; | |
2575 | ||
2576 | local_mitm = (local->auth_req & SMP_AUTH_MITM); | |
2577 | remote_mitm = (remote->auth_req & SMP_AUTH_MITM); | |
2578 | ||
2579 | /* If either side wants MITM, look up the method from the table, | |
2580 | * otherwise use JUST WORKS. | |
2581 | */ | |
2582 | if (local_mitm || remote_mitm) | |
2583 | method = get_auth_method(smp, local_io, remote_io); | |
2584 | else | |
2585 | method = JUST_WORKS; | |
2586 | ||
2587 | /* Don't confirm locally initiated pairing attempts */ | |
2588 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) | |
2589 | method = JUST_WORKS; | |
2590 | ||
2591 | return method; | |
2592 | } | |
2593 | ||
d8f8edbe JH |
2594 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
2595 | { | |
2596 | struct smp_cmd_public_key *key = (void *) skb->data; | |
2597 | struct hci_conn *hcon = conn->hcon; | |
2598 | struct l2cap_chan *chan = conn->smp; | |
2599 | struct smp_chan *smp = chan->data; | |
5e3d3d9b | 2600 | struct hci_dev *hdev = hcon->hdev; |
cbbbe3e2 | 2601 | struct smp_cmd_pairing_confirm cfm; |
d8f8edbe JH |
2602 | int err; |
2603 | ||
2604 | BT_DBG("conn %p", conn); | |
2605 | ||
2606 | if (skb->len < sizeof(*key)) | |
2607 | return SMP_INVALID_PARAMS; | |
2608 | ||
2609 | memcpy(smp->remote_pk, key, 64); | |
2610 | ||
a8ca617c JH |
2611 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) { |
2612 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk, | |
2613 | smp->rr, 0, cfm.confirm_val); | |
2614 | if (err) | |
2615 | return SMP_UNSPECIFIED; | |
2616 | ||
2617 | if (memcmp(cfm.confirm_val, smp->pcnf, 16)) | |
2618 | return SMP_CONFIRM_FAILED; | |
2619 | } | |
2620 | ||
d8f8edbe JH |
2621 | /* Non-initiating device sends its public key after receiving |
2622 | * the key from the initiating device. | |
2623 | */ | |
2624 | if (!hcon->out) { | |
2625 | err = sc_send_public_key(smp); | |
2626 | if (err) | |
2627 | return err; | |
2628 | } | |
2629 | ||
c7a3d57d | 2630 | SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk); |
e091526d | 2631 | SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32); |
d8f8edbe JH |
2632 | |
2633 | if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey)) | |
2634 | return SMP_UNSPECIFIED; | |
2635 | ||
c7a3d57d | 2636 | SMP_DBG("DHKey %32phN", smp->dhkey); |
d8f8edbe JH |
2637 | |
2638 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
2639 | ||
5e3d3d9b JH |
2640 | smp->method = sc_select_method(smp); |
2641 | ||
2642 | BT_DBG("%s selected method 0x%02x", hdev->name, smp->method); | |
2643 | ||
2644 | /* JUST_WORKS and JUST_CFM result in an unauthenticated key */ | |
2645 | if (smp->method == JUST_WORKS || smp->method == JUST_CFM) | |
2646 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; | |
2647 | else | |
2648 | hcon->pending_sec_level = BT_SECURITY_FIPS; | |
2649 | ||
aeb7d461 JH |
2650 | if (!memcmp(debug_pk, smp->remote_pk, 64)) |
2651 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
2652 | ||
38606f14 JH |
2653 | if (smp->method == DSP_PASSKEY) { |
2654 | get_random_bytes(&hcon->passkey_notify, | |
2655 | sizeof(hcon->passkey_notify)); | |
2656 | hcon->passkey_notify %= 1000000; | |
2657 | hcon->passkey_entered = 0; | |
2658 | smp->passkey_round = 0; | |
2659 | if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type, | |
2660 | hcon->dst_type, | |
2661 | hcon->passkey_notify, | |
2662 | hcon->passkey_entered)) | |
2663 | return SMP_UNSPECIFIED; | |
2664 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2665 | return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY); | |
2666 | } | |
2667 | ||
94ea7257 | 2668 | if (smp->method == REQ_OOB) { |
a29b0733 JH |
2669 | if (hcon->out) |
2670 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2671 | sizeof(smp->prnd), smp->prnd); | |
2672 | ||
2673 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2674 | ||
2675 | return 0; | |
2676 | } | |
2677 | ||
38606f14 JH |
2678 | if (hcon->out) |
2679 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2680 | ||
2681 | if (smp->method == REQ_PASSKEY) { | |
2682 | if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type, | |
2683 | hcon->dst_type)) | |
2684 | return SMP_UNSPECIFIED; | |
2685 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2686 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
2687 | return 0; | |
2688 | } | |
2689 | ||
cbbbe3e2 JH |
2690 | /* The Initiating device waits for the non-initiating device to |
2691 | * send the confirm value. | |
2692 | */ | |
2693 | if (conn->hcon->out) | |
2694 | return 0; | |
2695 | ||
2696 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, | |
2697 | 0, cfm.confirm_val); | |
2698 | if (err) | |
2699 | return SMP_UNSPECIFIED; | |
2700 | ||
2701 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
2702 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2703 | ||
d8f8edbe JH |
2704 | return 0; |
2705 | } | |
2706 | ||
6433a9a2 JH |
2707 | static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb) |
2708 | { | |
2709 | struct smp_cmd_dhkey_check *check = (void *) skb->data; | |
2710 | struct l2cap_chan *chan = conn->smp; | |
2711 | struct hci_conn *hcon = conn->hcon; | |
2712 | struct smp_chan *smp = chan->data; | |
2713 | u8 a[7], b[7], *local_addr, *remote_addr; | |
2714 | u8 io_cap[3], r[16], e[16]; | |
2715 | int err; | |
2716 | ||
2717 | BT_DBG("conn %p", conn); | |
2718 | ||
2719 | if (skb->len < sizeof(*check)) | |
2720 | return SMP_INVALID_PARAMS; | |
2721 | ||
2722 | memcpy(a, &hcon->init_addr, 6); | |
2723 | memcpy(b, &hcon->resp_addr, 6); | |
2724 | a[6] = hcon->init_addr_type; | |
2725 | b[6] = hcon->resp_addr_type; | |
2726 | ||
2727 | if (hcon->out) { | |
2728 | local_addr = a; | |
2729 | remote_addr = b; | |
2730 | memcpy(io_cap, &smp->prsp[1], 3); | |
2731 | } else { | |
2732 | local_addr = b; | |
2733 | remote_addr = a; | |
2734 | memcpy(io_cap, &smp->preq[1], 3); | |
2735 | } | |
2736 | ||
2737 | memset(r, 0, sizeof(r)); | |
2738 | ||
38606f14 JH |
2739 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2740 | put_unaligned_le32(hcon->passkey_notify, r); | |
882fafad JH |
2741 | else if (smp->method == REQ_OOB) |
2742 | memcpy(r, smp->lr, 16); | |
38606f14 | 2743 | |
6433a9a2 JH |
2744 | err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r, |
2745 | io_cap, remote_addr, local_addr, e); | |
2746 | if (err) | |
2747 | return SMP_UNSPECIFIED; | |
2748 | ||
2749 | if (memcmp(check->e, e, 16)) | |
2750 | return SMP_DHKEY_CHECK_FAILED; | |
2751 | ||
d3e54a87 JH |
2752 | if (!hcon->out) { |
2753 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
2754 | set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags); | |
2755 | return 0; | |
2756 | } | |
d378a2d7 | 2757 | |
d3e54a87 JH |
2758 | /* Slave sends DHKey check as response to master */ |
2759 | sc_dhkey_check(smp); | |
2760 | } | |
d378a2d7 | 2761 | |
d3e54a87 | 2762 | sc_add_ltk(smp); |
6433a9a2 JH |
2763 | |
2764 | if (hcon->out) { | |
8b76ce34 | 2765 | hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size); |
6433a9a2 JH |
2766 | hcon->enc_key_size = smp->enc_key_size; |
2767 | } | |
2768 | ||
2769 | return 0; | |
2770 | } | |
2771 | ||
1408bb6e JH |
2772 | static int smp_cmd_keypress_notify(struct l2cap_conn *conn, |
2773 | struct sk_buff *skb) | |
2774 | { | |
2775 | struct smp_cmd_keypress_notify *kp = (void *) skb->data; | |
2776 | ||
2777 | BT_DBG("value 0x%02x", kp->value); | |
2778 | ||
2779 | return 0; | |
2780 | } | |
2781 | ||
4befb867 | 2782 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 2783 | { |
5d88cc73 | 2784 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 2785 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 2786 | struct smp_chan *smp; |
92381f5c | 2787 | __u8 code, reason; |
eb492e01 AB |
2788 | int err = 0; |
2789 | ||
8ae9b984 | 2790 | if (skb->len < 1) |
92381f5c | 2791 | return -EILSEQ; |
92381f5c | 2792 | |
d7a5a11d | 2793 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) { |
2e65c9d2 AG |
2794 | reason = SMP_PAIRING_NOTSUPP; |
2795 | goto done; | |
2796 | } | |
2797 | ||
92381f5c | 2798 | code = skb->data[0]; |
eb492e01 AB |
2799 | skb_pull(skb, sizeof(code)); |
2800 | ||
b28b4943 JH |
2801 | smp = chan->data; |
2802 | ||
2803 | if (code > SMP_CMD_MAX) | |
2804 | goto drop; | |
2805 | ||
24bd0bd9 | 2806 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
2807 | goto drop; |
2808 | ||
2809 | /* If we don't have a context the only allowed commands are | |
2810 | * pairing request and security request. | |
8cf9fa12 | 2811 | */ |
b28b4943 JH |
2812 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
2813 | goto drop; | |
8cf9fa12 | 2814 | |
eb492e01 AB |
2815 | switch (code) { |
2816 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 2817 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
2818 | break; |
2819 | ||
2820 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 2821 | smp_failure(conn, 0); |
da85e5e5 | 2822 | err = -EPERM; |
eb492e01 AB |
2823 | break; |
2824 | ||
2825 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 2826 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
2827 | break; |
2828 | ||
2829 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 2830 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
2831 | break; |
2832 | ||
eb492e01 | 2833 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 2834 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
2835 | break; |
2836 | ||
eb492e01 | 2837 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 2838 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
2839 | break; |
2840 | ||
eb492e01 | 2841 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
2842 | reason = smp_cmd_encrypt_info(conn, skb); |
2843 | break; | |
2844 | ||
eb492e01 | 2845 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
2846 | reason = smp_cmd_master_ident(conn, skb); |
2847 | break; | |
2848 | ||
eb492e01 | 2849 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
2850 | reason = smp_cmd_ident_info(conn, skb); |
2851 | break; | |
2852 | ||
eb492e01 | 2853 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
2854 | reason = smp_cmd_ident_addr_info(conn, skb); |
2855 | break; | |
2856 | ||
eb492e01 | 2857 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 2858 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
2859 | break; |
2860 | ||
d8f8edbe JH |
2861 | case SMP_CMD_PUBLIC_KEY: |
2862 | reason = smp_cmd_public_key(conn, skb); | |
2863 | break; | |
2864 | ||
6433a9a2 JH |
2865 | case SMP_CMD_DHKEY_CHECK: |
2866 | reason = smp_cmd_dhkey_check(conn, skb); | |
2867 | break; | |
2868 | ||
1408bb6e JH |
2869 | case SMP_CMD_KEYPRESS_NOTIFY: |
2870 | reason = smp_cmd_keypress_notify(conn, skb); | |
2871 | break; | |
2872 | ||
eb492e01 AB |
2873 | default: |
2874 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 2875 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 2876 | goto done; |
eb492e01 AB |
2877 | } |
2878 | ||
3a0259bb | 2879 | done: |
9b7b18ef JH |
2880 | if (!err) { |
2881 | if (reason) | |
2882 | smp_failure(conn, reason); | |
8ae9b984 | 2883 | kfree_skb(skb); |
9b7b18ef JH |
2884 | } |
2885 | ||
eb492e01 | 2886 | return err; |
b28b4943 JH |
2887 | |
2888 | drop: | |
2889 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
2890 | code, &hcon->dst); | |
2891 | kfree_skb(skb); | |
2892 | return 0; | |
eb492e01 | 2893 | } |
7034b911 | 2894 | |
70db83c4 JH |
2895 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
2896 | { | |
2897 | struct l2cap_conn *conn = chan->conn; | |
2898 | ||
2899 | BT_DBG("chan %p", chan); | |
2900 | ||
fc75cc86 | 2901 | if (chan->data) |
5d88cc73 | 2902 | smp_chan_destroy(conn); |
5d88cc73 | 2903 | |
70db83c4 JH |
2904 | conn->smp = NULL; |
2905 | l2cap_chan_put(chan); | |
2906 | } | |
2907 | ||
b5ae344d JH |
2908 | static void bredr_pairing(struct l2cap_chan *chan) |
2909 | { | |
2910 | struct l2cap_conn *conn = chan->conn; | |
2911 | struct hci_conn *hcon = conn->hcon; | |
2912 | struct hci_dev *hdev = hcon->hdev; | |
2913 | struct smp_cmd_pairing req; | |
2914 | struct smp_chan *smp; | |
2915 | ||
2916 | BT_DBG("chan %p", chan); | |
2917 | ||
2918 | /* Only new pairings are interesting */ | |
2919 | if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags)) | |
2920 | return; | |
2921 | ||
2922 | /* Don't bother if we're not encrypted */ | |
2923 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
2924 | return; | |
2925 | ||
2926 | /* Only master may initiate SMP over BR/EDR */ | |
2927 | if (hcon->role != HCI_ROLE_MASTER) | |
2928 | return; | |
2929 | ||
2930 | /* Secure Connections support must be enabled */ | |
d7a5a11d | 2931 | if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED)) |
b5ae344d JH |
2932 | return; |
2933 | ||
2934 | /* BR/EDR must use Secure Connections for SMP */ | |
2935 | if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) && | |
b7cb93e5 | 2936 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
2937 | return; |
2938 | ||
2939 | /* If our LE support is not enabled don't do anything */ | |
d7a5a11d | 2940 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
b5ae344d JH |
2941 | return; |
2942 | ||
2943 | /* Don't bother if remote LE support is not enabled */ | |
2944 | if (!lmp_host_le_capable(hcon)) | |
2945 | return; | |
2946 | ||
2947 | /* Remote must support SMP fixed chan for BR/EDR */ | |
2948 | if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR)) | |
2949 | return; | |
2950 | ||
2951 | /* Don't bother if SMP is already ongoing */ | |
2952 | if (chan->data) | |
2953 | return; | |
2954 | ||
2955 | smp = smp_chan_create(conn); | |
2956 | if (!smp) { | |
2957 | BT_ERR("%s unable to create SMP context for BR/EDR", | |
2958 | hdev->name); | |
2959 | return; | |
2960 | } | |
2961 | ||
2962 | set_bit(SMP_FLAG_SC, &smp->flags); | |
2963 | ||
2964 | BT_DBG("%s starting SMP over BR/EDR", hdev->name); | |
2965 | ||
2966 | /* Prepare and send the BR/EDR SMP Pairing Request */ | |
2967 | build_bredr_pairing_cmd(smp, &req, NULL); | |
2968 | ||
2969 | smp->preq[0] = SMP_CMD_PAIRING_REQ; | |
2970 | memcpy(&smp->preq[1], &req, sizeof(req)); | |
2971 | ||
2972 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req); | |
2973 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); | |
2974 | } | |
2975 | ||
44f1a7ab JH |
2976 | static void smp_resume_cb(struct l2cap_chan *chan) |
2977 | { | |
b68fda68 | 2978 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
2979 | struct l2cap_conn *conn = chan->conn; |
2980 | struct hci_conn *hcon = conn->hcon; | |
2981 | ||
2982 | BT_DBG("chan %p", chan); | |
2983 | ||
b5ae344d JH |
2984 | if (hcon->type == ACL_LINK) { |
2985 | bredr_pairing(chan); | |
ef8efe4b | 2986 | return; |
b5ae344d | 2987 | } |
ef8efe4b | 2988 | |
86d1407c JH |
2989 | if (!smp) |
2990 | return; | |
b68fda68 | 2991 | |
84bc0db5 JH |
2992 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
2993 | return; | |
2994 | ||
86d1407c JH |
2995 | cancel_delayed_work(&smp->security_timer); |
2996 | ||
d6268e86 | 2997 | smp_distribute_keys(smp); |
44f1a7ab JH |
2998 | } |
2999 | ||
70db83c4 JH |
3000 | static void smp_ready_cb(struct l2cap_chan *chan) |
3001 | { | |
3002 | struct l2cap_conn *conn = chan->conn; | |
b5ae344d | 3003 | struct hci_conn *hcon = conn->hcon; |
70db83c4 JH |
3004 | |
3005 | BT_DBG("chan %p", chan); | |
3006 | ||
7883746b JH |
3007 | /* No need to call l2cap_chan_hold() here since we already own |
3008 | * the reference taken in smp_new_conn_cb(). This is just the | |
3009 | * first time that we tie it to a specific pointer. The code in | |
3010 | * l2cap_core.c ensures that there's no risk this function wont | |
3011 | * get called if smp_new_conn_cb was previously called. | |
3012 | */ | |
70db83c4 | 3013 | conn->smp = chan; |
b5ae344d JH |
3014 | |
3015 | if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
3016 | bredr_pairing(chan); | |
70db83c4 JH |
3017 | } |
3018 | ||
4befb867 JH |
3019 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
3020 | { | |
3021 | int err; | |
3022 | ||
3023 | BT_DBG("chan %p", chan); | |
3024 | ||
3025 | err = smp_sig_channel(chan, skb); | |
3026 | if (err) { | |
b68fda68 | 3027 | struct smp_chan *smp = chan->data; |
4befb867 | 3028 | |
b68fda68 JH |
3029 | if (smp) |
3030 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 3031 | |
1e91c29e | 3032 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
3033 | } |
3034 | ||
3035 | return err; | |
3036 | } | |
3037 | ||
70db83c4 JH |
3038 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
3039 | unsigned long hdr_len, | |
3040 | unsigned long len, int nb) | |
3041 | { | |
3042 | struct sk_buff *skb; | |
3043 | ||
3044 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
3045 | if (!skb) | |
3046 | return ERR_PTR(-ENOMEM); | |
3047 | ||
3048 | skb->priority = HCI_PRIO_MAX; | |
a4368ff3 | 3049 | bt_cb(skb)->l2cap.chan = chan; |
70db83c4 JH |
3050 | |
3051 | return skb; | |
3052 | } | |
3053 | ||
3054 | static const struct l2cap_ops smp_chan_ops = { | |
3055 | .name = "Security Manager", | |
3056 | .ready = smp_ready_cb, | |
5d88cc73 | 3057 | .recv = smp_recv_cb, |
70db83c4 JH |
3058 | .alloc_skb = smp_alloc_skb_cb, |
3059 | .teardown = smp_teardown_cb, | |
44f1a7ab | 3060 | .resume = smp_resume_cb, |
70db83c4 JH |
3061 | |
3062 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
3063 | .state_change = l2cap_chan_no_state_change, |
3064 | .close = l2cap_chan_no_close, | |
3065 | .defer = l2cap_chan_no_defer, | |
3066 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
3067 | .set_shutdown = l2cap_chan_no_set_shutdown, |
3068 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3069 | }; |
3070 | ||
3071 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
3072 | { | |
3073 | struct l2cap_chan *chan; | |
3074 | ||
3075 | BT_DBG("pchan %p", pchan); | |
3076 | ||
3077 | chan = l2cap_chan_create(); | |
3078 | if (!chan) | |
3079 | return NULL; | |
3080 | ||
3081 | chan->chan_type = pchan->chan_type; | |
3082 | chan->ops = &smp_chan_ops; | |
3083 | chan->scid = pchan->scid; | |
3084 | chan->dcid = chan->scid; | |
3085 | chan->imtu = pchan->imtu; | |
3086 | chan->omtu = pchan->omtu; | |
3087 | chan->mode = pchan->mode; | |
3088 | ||
abe84903 JH |
3089 | /* Other L2CAP channels may request SMP routines in order to |
3090 | * change the security level. This means that the SMP channel | |
3091 | * lock must be considered in its own category to avoid lockdep | |
3092 | * warnings. | |
3093 | */ | |
3094 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
3095 | ||
70db83c4 JH |
3096 | BT_DBG("created chan %p", chan); |
3097 | ||
3098 | return chan; | |
3099 | } | |
3100 | ||
3101 | static const struct l2cap_ops smp_root_chan_ops = { | |
3102 | .name = "Security Manager Root", | |
3103 | .new_connection = smp_new_conn_cb, | |
3104 | ||
3105 | /* None of these are implemented for the root channel */ | |
3106 | .close = l2cap_chan_no_close, | |
3107 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
3108 | .recv = l2cap_chan_no_recv, | |
3109 | .state_change = l2cap_chan_no_state_change, | |
3110 | .teardown = l2cap_chan_no_teardown, | |
3111 | .ready = l2cap_chan_no_ready, | |
3112 | .defer = l2cap_chan_no_defer, | |
3113 | .suspend = l2cap_chan_no_suspend, | |
3114 | .resume = l2cap_chan_no_resume, | |
3115 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
3116 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3117 | }; |
3118 | ||
ef8efe4b | 3119 | static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) |
711eafe3 | 3120 | { |
70db83c4 | 3121 | struct l2cap_chan *chan; |
88a479d9 | 3122 | struct smp_dev *smp; |
71af2f6b HX |
3123 | struct crypto_skcipher *tfm_aes; |
3124 | struct crypto_shash *tfm_cmac; | |
70db83c4 | 3125 | |
ef8efe4b | 3126 | if (cid == L2CAP_CID_SMP_BREDR) { |
88a479d9 | 3127 | smp = NULL; |
ef8efe4b JH |
3128 | goto create_chan; |
3129 | } | |
711eafe3 | 3130 | |
88a479d9 MH |
3131 | smp = kzalloc(sizeof(*smp), GFP_KERNEL); |
3132 | if (!smp) | |
3133 | return ERR_PTR(-ENOMEM); | |
3134 | ||
71af2f6b | 3135 | tfm_aes = crypto_alloc_skcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
defce9e8 | 3136 | if (IS_ERR(tfm_aes)) { |
88a479d9 MH |
3137 | BT_ERR("Unable to create ECB crypto context"); |
3138 | kzfree(smp); | |
fe700771 | 3139 | return ERR_CAST(tfm_aes); |
711eafe3 JH |
3140 | } |
3141 | ||
71af2f6b | 3142 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
6e2dc6d1 MH |
3143 | if (IS_ERR(tfm_cmac)) { |
3144 | BT_ERR("Unable to create CMAC crypto context"); | |
71af2f6b | 3145 | crypto_free_skcipher(tfm_aes); |
6e2dc6d1 MH |
3146 | kzfree(smp); |
3147 | return ERR_CAST(tfm_cmac); | |
3148 | } | |
3149 | ||
88a479d9 | 3150 | smp->tfm_aes = tfm_aes; |
6e2dc6d1 | 3151 | smp->tfm_cmac = tfm_cmac; |
b1f663c9 | 3152 | smp->min_key_size = SMP_MIN_ENC_KEY_SIZE; |
2fd36558 | 3153 | smp->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
88a479d9 | 3154 | |
ef8efe4b | 3155 | create_chan: |
70db83c4 JH |
3156 | chan = l2cap_chan_create(); |
3157 | if (!chan) { | |
63511f6d | 3158 | if (smp) { |
71af2f6b HX |
3159 | crypto_free_skcipher(smp->tfm_aes); |
3160 | crypto_free_shash(smp->tfm_cmac); | |
63511f6d MH |
3161 | kzfree(smp); |
3162 | } | |
ef8efe4b | 3163 | return ERR_PTR(-ENOMEM); |
70db83c4 JH |
3164 | } |
3165 | ||
88a479d9 | 3166 | chan->data = smp; |
defce9e8 | 3167 | |
ef8efe4b | 3168 | l2cap_add_scid(chan, cid); |
70db83c4 JH |
3169 | |
3170 | l2cap_chan_set_defaults(chan); | |
3171 | ||
157029ba | 3172 | if (cid == L2CAP_CID_SMP) { |
39e3e744 JH |
3173 | u8 bdaddr_type; |
3174 | ||
3175 | hci_copy_identity_address(hdev, &chan->src, &bdaddr_type); | |
3176 | ||
3177 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) | |
157029ba | 3178 | chan->src_type = BDADDR_LE_PUBLIC; |
39e3e744 JH |
3179 | else |
3180 | chan->src_type = BDADDR_LE_RANDOM; | |
157029ba MH |
3181 | } else { |
3182 | bacpy(&chan->src, &hdev->bdaddr); | |
ef8efe4b | 3183 | chan->src_type = BDADDR_BREDR; |
157029ba MH |
3184 | } |
3185 | ||
70db83c4 JH |
3186 | chan->state = BT_LISTEN; |
3187 | chan->mode = L2CAP_MODE_BASIC; | |
3188 | chan->imtu = L2CAP_DEFAULT_MTU; | |
3189 | chan->ops = &smp_root_chan_ops; | |
3190 | ||
abe84903 JH |
3191 | /* Set correct nesting level for a parent/listening channel */ |
3192 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
3193 | ||
ef8efe4b | 3194 | return chan; |
711eafe3 JH |
3195 | } |
3196 | ||
ef8efe4b | 3197 | static void smp_del_chan(struct l2cap_chan *chan) |
711eafe3 | 3198 | { |
88a479d9 | 3199 | struct smp_dev *smp; |
70db83c4 | 3200 | |
ef8efe4b | 3201 | BT_DBG("chan %p", chan); |
711eafe3 | 3202 | |
88a479d9 MH |
3203 | smp = chan->data; |
3204 | if (smp) { | |
defce9e8 | 3205 | chan->data = NULL; |
71af2f6b HX |
3206 | crypto_free_skcipher(smp->tfm_aes); |
3207 | crypto_free_shash(smp->tfm_cmac); | |
88a479d9 | 3208 | kzfree(smp); |
711eafe3 | 3209 | } |
70db83c4 | 3210 | |
70db83c4 | 3211 | l2cap_chan_put(chan); |
711eafe3 | 3212 | } |
ef8efe4b | 3213 | |
300acfde MH |
3214 | static ssize_t force_bredr_smp_read(struct file *file, |
3215 | char __user *user_buf, | |
3216 | size_t count, loff_t *ppos) | |
3217 | { | |
3218 | struct hci_dev *hdev = file->private_data; | |
3219 | char buf[3]; | |
3220 | ||
b7cb93e5 | 3221 | buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; |
300acfde MH |
3222 | buf[1] = '\n'; |
3223 | buf[2] = '\0'; | |
3224 | return simple_read_from_buffer(user_buf, count, ppos, buf, 2); | |
3225 | } | |
3226 | ||
3227 | static ssize_t force_bredr_smp_write(struct file *file, | |
3228 | const char __user *user_buf, | |
3229 | size_t count, loff_t *ppos) | |
3230 | { | |
3231 | struct hci_dev *hdev = file->private_data; | |
3232 | char buf[32]; | |
3233 | size_t buf_size = min(count, (sizeof(buf)-1)); | |
3234 | bool enable; | |
3235 | ||
3236 | if (copy_from_user(buf, user_buf, buf_size)) | |
3237 | return -EFAULT; | |
3238 | ||
3239 | buf[buf_size] = '\0'; | |
3240 | if (strtobool(buf, &enable)) | |
3241 | return -EINVAL; | |
3242 | ||
b7cb93e5 | 3243 | if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
300acfde MH |
3244 | return -EALREADY; |
3245 | ||
3246 | if (enable) { | |
3247 | struct l2cap_chan *chan; | |
3248 | ||
3249 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); | |
3250 | if (IS_ERR(chan)) | |
3251 | return PTR_ERR(chan); | |
3252 | ||
3253 | hdev->smp_bredr_data = chan; | |
3254 | } else { | |
3255 | struct l2cap_chan *chan; | |
3256 | ||
3257 | chan = hdev->smp_bredr_data; | |
3258 | hdev->smp_bredr_data = NULL; | |
3259 | smp_del_chan(chan); | |
3260 | } | |
3261 | ||
b7cb93e5 | 3262 | hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); |
300acfde MH |
3263 | |
3264 | return count; | |
3265 | } | |
3266 | ||
3267 | static const struct file_operations force_bredr_smp_fops = { | |
3268 | .open = simple_open, | |
3269 | .read = force_bredr_smp_read, | |
3270 | .write = force_bredr_smp_write, | |
3271 | .llseek = default_llseek, | |
3272 | }; | |
3273 | ||
b1f663c9 JH |
3274 | static ssize_t le_min_key_size_read(struct file *file, |
3275 | char __user *user_buf, | |
3276 | size_t count, loff_t *ppos) | |
3277 | { | |
3278 | struct hci_dev *hdev = file->private_data; | |
3279 | char buf[4]; | |
3280 | ||
3281 | snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size); | |
3282 | ||
3283 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3284 | } | |
3285 | ||
3286 | static ssize_t le_min_key_size_write(struct file *file, | |
3287 | const char __user *user_buf, | |
3288 | size_t count, loff_t *ppos) | |
3289 | { | |
3290 | struct hci_dev *hdev = file->private_data; | |
3291 | char buf[32]; | |
3292 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3293 | u8 key_size; | |
3294 | ||
3295 | if (copy_from_user(buf, user_buf, buf_size)) | |
3296 | return -EFAULT; | |
3297 | ||
3298 | buf[buf_size] = '\0'; | |
3299 | ||
3300 | sscanf(buf, "%hhu", &key_size); | |
3301 | ||
3302 | if (key_size > SMP_DEV(hdev)->max_key_size || | |
3303 | key_size < SMP_MIN_ENC_KEY_SIZE) | |
3304 | return -EINVAL; | |
3305 | ||
3306 | SMP_DEV(hdev)->min_key_size = key_size; | |
3307 | ||
3308 | return count; | |
3309 | } | |
3310 | ||
3311 | static const struct file_operations le_min_key_size_fops = { | |
3312 | .open = simple_open, | |
3313 | .read = le_min_key_size_read, | |
3314 | .write = le_min_key_size_write, | |
3315 | .llseek = default_llseek, | |
3316 | }; | |
3317 | ||
2fd36558 JH |
3318 | static ssize_t le_max_key_size_read(struct file *file, |
3319 | char __user *user_buf, | |
3320 | size_t count, loff_t *ppos) | |
3321 | { | |
3322 | struct hci_dev *hdev = file->private_data; | |
3323 | char buf[4]; | |
3324 | ||
3325 | snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->max_key_size); | |
3326 | ||
3327 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3328 | } | |
3329 | ||
3330 | static ssize_t le_max_key_size_write(struct file *file, | |
3331 | const char __user *user_buf, | |
3332 | size_t count, loff_t *ppos) | |
3333 | { | |
3334 | struct hci_dev *hdev = file->private_data; | |
3335 | char buf[32]; | |
3336 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3337 | u8 key_size; | |
3338 | ||
3339 | if (copy_from_user(buf, user_buf, buf_size)) | |
3340 | return -EFAULT; | |
3341 | ||
3342 | buf[buf_size] = '\0'; | |
3343 | ||
3344 | sscanf(buf, "%hhu", &key_size); | |
3345 | ||
b1f663c9 JH |
3346 | if (key_size > SMP_MAX_ENC_KEY_SIZE || |
3347 | key_size < SMP_DEV(hdev)->min_key_size) | |
2fd36558 JH |
3348 | return -EINVAL; |
3349 | ||
3350 | SMP_DEV(hdev)->max_key_size = key_size; | |
3351 | ||
3352 | return count; | |
3353 | } | |
3354 | ||
3355 | static const struct file_operations le_max_key_size_fops = { | |
3356 | .open = simple_open, | |
3357 | .read = le_max_key_size_read, | |
3358 | .write = le_max_key_size_write, | |
3359 | .llseek = default_llseek, | |
3360 | }; | |
3361 | ||
ef8efe4b JH |
3362 | int smp_register(struct hci_dev *hdev) |
3363 | { | |
3364 | struct l2cap_chan *chan; | |
3365 | ||
3366 | BT_DBG("%s", hdev->name); | |
3367 | ||
7e7ec445 MH |
3368 | /* If the controller does not support Low Energy operation, then |
3369 | * there is also no need to register any SMP channel. | |
3370 | */ | |
3371 | if (!lmp_le_capable(hdev)) | |
3372 | return 0; | |
3373 | ||
2b8df323 MH |
3374 | if (WARN_ON(hdev->smp_data)) { |
3375 | chan = hdev->smp_data; | |
3376 | hdev->smp_data = NULL; | |
3377 | smp_del_chan(chan); | |
3378 | } | |
3379 | ||
ef8efe4b JH |
3380 | chan = smp_add_cid(hdev, L2CAP_CID_SMP); |
3381 | if (IS_ERR(chan)) | |
3382 | return PTR_ERR(chan); | |
3383 | ||
3384 | hdev->smp_data = chan; | |
3385 | ||
b1f663c9 JH |
3386 | debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev, |
3387 | &le_min_key_size_fops); | |
2fd36558 JH |
3388 | debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev, |
3389 | &le_max_key_size_fops); | |
3390 | ||
300acfde MH |
3391 | /* If the controller does not support BR/EDR Secure Connections |
3392 | * feature, then the BR/EDR SMP channel shall not be present. | |
3393 | * | |
3394 | * To test this with Bluetooth 4.0 controllers, create a debugfs | |
3395 | * switch that allows forcing BR/EDR SMP support and accepting | |
3396 | * cross-transport pairing on non-AES encrypted connections. | |
3397 | */ | |
3398 | if (!lmp_sc_capable(hdev)) { | |
3399 | debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, | |
3400 | hdev, &force_bredr_smp_fops); | |
ef8efe4b | 3401 | return 0; |
300acfde | 3402 | } |
ef8efe4b | 3403 | |
2b8df323 MH |
3404 | if (WARN_ON(hdev->smp_bredr_data)) { |
3405 | chan = hdev->smp_bredr_data; | |
3406 | hdev->smp_bredr_data = NULL; | |
3407 | smp_del_chan(chan); | |
3408 | } | |
3409 | ||
ef8efe4b JH |
3410 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); |
3411 | if (IS_ERR(chan)) { | |
3412 | int err = PTR_ERR(chan); | |
3413 | chan = hdev->smp_data; | |
3414 | hdev->smp_data = NULL; | |
3415 | smp_del_chan(chan); | |
3416 | return err; | |
3417 | } | |
3418 | ||
3419 | hdev->smp_bredr_data = chan; | |
3420 | ||
3421 | return 0; | |
3422 | } | |
3423 | ||
3424 | void smp_unregister(struct hci_dev *hdev) | |
3425 | { | |
3426 | struct l2cap_chan *chan; | |
3427 | ||
3428 | if (hdev->smp_bredr_data) { | |
3429 | chan = hdev->smp_bredr_data; | |
3430 | hdev->smp_bredr_data = NULL; | |
3431 | smp_del_chan(chan); | |
3432 | } | |
3433 | ||
3434 | if (hdev->smp_data) { | |
3435 | chan = hdev->smp_data; | |
3436 | hdev->smp_data = NULL; | |
3437 | smp_del_chan(chan); | |
3438 | } | |
3439 | } | |
0a2b0f04 JH |
3440 | |
3441 | #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP) | |
3442 | ||
71af2f6b | 3443 | static int __init test_ah(struct crypto_skcipher *tfm_aes) |
cfc4198e JH |
3444 | { |
3445 | const u8 irk[16] = { | |
3446 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3447 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3448 | const u8 r[3] = { 0x94, 0x81, 0x70 }; | |
3449 | const u8 exp[3] = { 0xaa, 0xfb, 0x0d }; | |
3450 | u8 res[3]; | |
3451 | int err; | |
3452 | ||
3453 | err = smp_ah(tfm_aes, irk, r, res); | |
3454 | if (err) | |
3455 | return err; | |
3456 | ||
3457 | if (memcmp(res, exp, 3)) | |
3458 | return -EINVAL; | |
3459 | ||
3460 | return 0; | |
3461 | } | |
3462 | ||
71af2f6b | 3463 | static int __init test_c1(struct crypto_skcipher *tfm_aes) |
cfc4198e JH |
3464 | { |
3465 | const u8 k[16] = { | |
3466 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3467 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3468 | const u8 r[16] = { | |
3469 | 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63, | |
3470 | 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 }; | |
3471 | const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 }; | |
3472 | const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 }; | |
3473 | const u8 _iat = 0x01; | |
3474 | const u8 _rat = 0x00; | |
3475 | const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } }; | |
3476 | const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } }; | |
3477 | const u8 exp[16] = { | |
3478 | 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2, | |
3479 | 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e }; | |
3480 | u8 res[16]; | |
3481 | int err; | |
3482 | ||
3483 | err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res); | |
3484 | if (err) | |
3485 | return err; | |
3486 | ||
3487 | if (memcmp(res, exp, 16)) | |
3488 | return -EINVAL; | |
3489 | ||
3490 | return 0; | |
3491 | } | |
3492 | ||
71af2f6b | 3493 | static int __init test_s1(struct crypto_skcipher *tfm_aes) |
cfc4198e JH |
3494 | { |
3495 | const u8 k[16] = { | |
3496 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3497 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3498 | const u8 r1[16] = { | |
3499 | 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }; | |
3500 | const u8 r2[16] = { | |
3501 | 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 }; | |
3502 | const u8 exp[16] = { | |
3503 | 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b, | |
3504 | 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a }; | |
3505 | u8 res[16]; | |
3506 | int err; | |
3507 | ||
3508 | err = smp_s1(tfm_aes, k, r1, r2, res); | |
3509 | if (err) | |
3510 | return err; | |
3511 | ||
3512 | if (memcmp(res, exp, 16)) | |
3513 | return -EINVAL; | |
3514 | ||
3515 | return 0; | |
3516 | } | |
3517 | ||
71af2f6b | 3518 | static int __init test_f4(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3519 | { |
3520 | const u8 u[32] = { | |
3521 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3522 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3523 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3524 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3525 | const u8 v[32] = { | |
3526 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3527 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3528 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3529 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3530 | const u8 x[16] = { | |
3531 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3532 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3533 | const u8 z = 0x00; | |
3534 | const u8 exp[16] = { | |
3535 | 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1, | |
3536 | 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 }; | |
3537 | u8 res[16]; | |
3538 | int err; | |
3539 | ||
3540 | err = smp_f4(tfm_cmac, u, v, x, z, res); | |
3541 | if (err) | |
3542 | return err; | |
3543 | ||
3544 | if (memcmp(res, exp, 16)) | |
3545 | return -EINVAL; | |
3546 | ||
3547 | return 0; | |
3548 | } | |
3549 | ||
71af2f6b | 3550 | static int __init test_f5(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3551 | { |
3552 | const u8 w[32] = { | |
3553 | 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86, | |
3554 | 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99, | |
3555 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3556 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3557 | const u8 n1[16] = { | |
3558 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3559 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3560 | const u8 n2[16] = { | |
3561 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3562 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3563 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3564 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3565 | const u8 exp_ltk[16] = { | |
3566 | 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98, | |
3567 | 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 }; | |
3568 | const u8 exp_mackey[16] = { | |
3569 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3570 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3571 | u8 mackey[16], ltk[16]; | |
3572 | int err; | |
3573 | ||
3574 | err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk); | |
3575 | if (err) | |
3576 | return err; | |
3577 | ||
3578 | if (memcmp(mackey, exp_mackey, 16)) | |
3579 | return -EINVAL; | |
3580 | ||
3581 | if (memcmp(ltk, exp_ltk, 16)) | |
3582 | return -EINVAL; | |
3583 | ||
3584 | return 0; | |
3585 | } | |
3586 | ||
71af2f6b | 3587 | static int __init test_f6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3588 | { |
3589 | const u8 w[16] = { | |
3590 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3591 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3592 | const u8 n1[16] = { | |
3593 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3594 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3595 | const u8 n2[16] = { | |
3596 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3597 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3598 | const u8 r[16] = { | |
3599 | 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08, | |
3600 | 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 }; | |
3601 | const u8 io_cap[3] = { 0x02, 0x01, 0x01 }; | |
3602 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3603 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3604 | const u8 exp[16] = { | |
3605 | 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2, | |
3606 | 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 }; | |
3607 | u8 res[16]; | |
3608 | int err; | |
3609 | ||
3610 | err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res); | |
3611 | if (err) | |
3612 | return err; | |
3613 | ||
3614 | if (memcmp(res, exp, 16)) | |
3615 | return -EINVAL; | |
3616 | ||
3617 | return 0; | |
3618 | } | |
3619 | ||
71af2f6b | 3620 | static int __init test_g2(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3621 | { |
3622 | const u8 u[32] = { | |
3623 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3624 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3625 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3626 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3627 | const u8 v[32] = { | |
3628 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3629 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3630 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3631 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3632 | const u8 x[16] = { | |
3633 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3634 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3635 | const u8 y[16] = { | |
3636 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3637 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3638 | const u32 exp_val = 0x2f9ed5ba % 1000000; | |
3639 | u32 val; | |
3640 | int err; | |
3641 | ||
3642 | err = smp_g2(tfm_cmac, u, v, x, y, &val); | |
3643 | if (err) | |
3644 | return err; | |
3645 | ||
3646 | if (val != exp_val) | |
3647 | return -EINVAL; | |
3648 | ||
3649 | return 0; | |
3650 | } | |
3651 | ||
71af2f6b | 3652 | static int __init test_h6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3653 | { |
3654 | const u8 w[16] = { | |
3655 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3656 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3657 | const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
3658 | const u8 exp[16] = { | |
3659 | 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8, | |
3660 | 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d }; | |
3661 | u8 res[16]; | |
3662 | int err; | |
3663 | ||
3664 | err = smp_h6(tfm_cmac, w, key_id, res); | |
3665 | if (err) | |
3666 | return err; | |
3667 | ||
3668 | if (memcmp(res, exp, 16)) | |
3669 | return -EINVAL; | |
3670 | ||
3671 | return 0; | |
3672 | } | |
3673 | ||
64dd374e MH |
3674 | static char test_smp_buffer[32]; |
3675 | ||
3676 | static ssize_t test_smp_read(struct file *file, char __user *user_buf, | |
3677 | size_t count, loff_t *ppos) | |
3678 | { | |
3679 | return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer, | |
3680 | strlen(test_smp_buffer)); | |
3681 | } | |
3682 | ||
3683 | static const struct file_operations test_smp_fops = { | |
3684 | .open = simple_open, | |
3685 | .read = test_smp_read, | |
3686 | .llseek = default_llseek, | |
3687 | }; | |
3688 | ||
71af2f6b HX |
3689 | static int __init run_selftests(struct crypto_skcipher *tfm_aes, |
3690 | struct crypto_shash *tfm_cmac) | |
0a2b0f04 | 3691 | { |
255047b0 MH |
3692 | ktime_t calltime, delta, rettime; |
3693 | unsigned long long duration; | |
cfc4198e JH |
3694 | int err; |
3695 | ||
255047b0 MH |
3696 | calltime = ktime_get(); |
3697 | ||
cfc4198e JH |
3698 | err = test_ah(tfm_aes); |
3699 | if (err) { | |
3700 | BT_ERR("smp_ah test failed"); | |
64dd374e | 3701 | goto done; |
cfc4198e JH |
3702 | } |
3703 | ||
3704 | err = test_c1(tfm_aes); | |
3705 | if (err) { | |
3706 | BT_ERR("smp_c1 test failed"); | |
64dd374e | 3707 | goto done; |
cfc4198e JH |
3708 | } |
3709 | ||
3710 | err = test_s1(tfm_aes); | |
3711 | if (err) { | |
3712 | BT_ERR("smp_s1 test failed"); | |
64dd374e | 3713 | goto done; |
cfc4198e JH |
3714 | } |
3715 | ||
fb2969a3 JH |
3716 | err = test_f4(tfm_cmac); |
3717 | if (err) { | |
3718 | BT_ERR("smp_f4 test failed"); | |
64dd374e | 3719 | goto done; |
fb2969a3 JH |
3720 | } |
3721 | ||
3722 | err = test_f5(tfm_cmac); | |
3723 | if (err) { | |
3724 | BT_ERR("smp_f5 test failed"); | |
64dd374e | 3725 | goto done; |
fb2969a3 JH |
3726 | } |
3727 | ||
3728 | err = test_f6(tfm_cmac); | |
3729 | if (err) { | |
3730 | BT_ERR("smp_f6 test failed"); | |
64dd374e | 3731 | goto done; |
fb2969a3 JH |
3732 | } |
3733 | ||
3734 | err = test_g2(tfm_cmac); | |
3735 | if (err) { | |
3736 | BT_ERR("smp_g2 test failed"); | |
64dd374e | 3737 | goto done; |
fb2969a3 JH |
3738 | } |
3739 | ||
3740 | err = test_h6(tfm_cmac); | |
3741 | if (err) { | |
3742 | BT_ERR("smp_h6 test failed"); | |
64dd374e | 3743 | goto done; |
fb2969a3 JH |
3744 | } |
3745 | ||
255047b0 MH |
3746 | rettime = ktime_get(); |
3747 | delta = ktime_sub(rettime, calltime); | |
3748 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
3749 | ||
5ced2464 | 3750 | BT_INFO("SMP test passed in %llu usecs", duration); |
0a2b0f04 | 3751 | |
64dd374e MH |
3752 | done: |
3753 | if (!err) | |
3754 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), | |
3755 | "PASS (%llu usecs)\n", duration); | |
3756 | else | |
3757 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n"); | |
3758 | ||
3759 | debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL, | |
3760 | &test_smp_fops); | |
3761 | ||
3762 | return err; | |
0a2b0f04 JH |
3763 | } |
3764 | ||
3765 | int __init bt_selftest_smp(void) | |
3766 | { | |
71af2f6b HX |
3767 | struct crypto_skcipher *tfm_aes; |
3768 | struct crypto_shash *tfm_cmac; | |
0a2b0f04 JH |
3769 | int err; |
3770 | ||
71af2f6b | 3771 | tfm_aes = crypto_alloc_skcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 JH |
3772 | if (IS_ERR(tfm_aes)) { |
3773 | BT_ERR("Unable to create ECB crypto context"); | |
3774 | return PTR_ERR(tfm_aes); | |
3775 | } | |
3776 | ||
71af2f6b | 3777 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 JH |
3778 | if (IS_ERR(tfm_cmac)) { |
3779 | BT_ERR("Unable to create CMAC crypto context"); | |
71af2f6b | 3780 | crypto_free_skcipher(tfm_aes); |
0a2b0f04 JH |
3781 | return PTR_ERR(tfm_cmac); |
3782 | } | |
3783 | ||
3784 | err = run_selftests(tfm_aes, tfm_cmac); | |
3785 | ||
71af2f6b HX |
3786 | crypto_free_shash(tfm_cmac); |
3787 | crypto_free_skcipher(tfm_aes); | |
0a2b0f04 JH |
3788 | |
3789 | return err; | |
3790 | } | |
3791 | ||
3792 | #endif |