Commit | Line | Data |
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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
300acfde | 23 | #include <linux/debugfs.h> |
8c520a59 | 24 | #include <linux/scatterlist.h> |
a4770e11 | 25 | #include <linux/crypto.h> |
8c520a59 | 26 | #include <crypto/b128ops.h> |
71af2f6b | 27 | #include <crypto/hash.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 | ||
a4770e11 | 91 | struct crypto_cipher *tfm_aes; |
71af2f6b | 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 | |
a4770e11 | 130 | struct crypto_cipher *tfm_aes; |
71af2f6b | 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 | ||
a4770e11 | 364 | static int smp_e(struct crypto_cipher *tfm, const u8 *k, u8 *r) |
d22ef0bc | 365 | { |
943a732a | 366 | uint8_t tmp[16], data[16]; |
201a5929 | 367 | int err; |
d22ef0bc | 368 | |
011c391a JH |
369 | SMP_DBG("k %16phN r %16phN", k, r); |
370 | ||
7f376cd6 | 371 | if (!tfm) { |
d22ef0bc AB |
372 | BT_ERR("tfm %p", tfm); |
373 | return -EINVAL; | |
374 | } | |
375 | ||
943a732a | 376 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 377 | swap_buf(k, tmp, 16); |
943a732a | 378 | |
a4770e11 | 379 | err = crypto_cipher_setkey(tfm, tmp, 16); |
d22ef0bc AB |
380 | if (err) { |
381 | BT_ERR("cipher setkey failed: %d", err); | |
382 | return err; | |
383 | } | |
384 | ||
943a732a | 385 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 386 | swap_buf(r, data, 16); |
943a732a | 387 | |
a4770e11 | 388 | crypto_cipher_encrypt_one(tfm, data, data); |
d22ef0bc | 389 | |
943a732a | 390 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 391 | swap_buf(data, r, 16); |
943a732a | 392 | |
011c391a JH |
393 | SMP_DBG("r %16phN", r); |
394 | ||
d22ef0bc AB |
395 | return err; |
396 | } | |
397 | ||
a4770e11 | 398 | static int smp_c1(struct crypto_cipher *tfm_aes, const u8 k[16], |
06edf8de JH |
399 | const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat, |
400 | const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16]) | |
6a77083a | 401 | { |
06edf8de | 402 | u8 p1[16], p2[16]; |
6a77083a JH |
403 | int err; |
404 | ||
011c391a JH |
405 | SMP_DBG("k %16phN r %16phN", k, r); |
406 | SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra); | |
407 | SMP_DBG("preq %7phN pres %7phN", preq, pres); | |
408 | ||
06edf8de | 409 | memset(p1, 0, 16); |
6a77083a | 410 | |
06edf8de JH |
411 | /* p1 = pres || preq || _rat || _iat */ |
412 | p1[0] = _iat; | |
413 | p1[1] = _rat; | |
414 | memcpy(p1 + 2, preq, 7); | |
415 | memcpy(p1 + 9, pres, 7); | |
416 | ||
011c391a | 417 | SMP_DBG("p1 %16phN", p1); |
06edf8de JH |
418 | |
419 | /* res = r XOR p1 */ | |
420 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
421 | ||
422 | /* res = e(k, res) */ | |
423 | err = smp_e(tfm_aes, k, res); | |
424 | if (err) { | |
425 | BT_ERR("Encrypt data error"); | |
6a77083a | 426 | return err; |
06edf8de | 427 | } |
6a77083a | 428 | |
011c391a JH |
429 | /* p2 = padding || ia || ra */ |
430 | memcpy(p2, ra, 6); | |
431 | memcpy(p2 + 6, ia, 6); | |
432 | memset(p2 + 12, 0, 4); | |
433 | ||
434 | SMP_DBG("p2 %16phN", p2); | |
435 | ||
06edf8de JH |
436 | /* res = res XOR p2 */ |
437 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
438 | ||
439 | /* res = e(k, res) */ | |
440 | err = smp_e(tfm_aes, k, res); | |
441 | if (err) | |
442 | BT_ERR("Encrypt data error"); | |
443 | ||
444 | return err; | |
445 | } | |
446 | ||
a4770e11 | 447 | static int smp_s1(struct crypto_cipher *tfm_aes, const u8 k[16], |
06edf8de JH |
448 | const u8 r1[16], const u8 r2[16], u8 _r[16]) |
449 | { | |
450 | int err; | |
451 | ||
452 | /* Just least significant octets from r1 and r2 are considered */ | |
453 | memcpy(_r, r2, 8); | |
454 | memcpy(_r + 8, r1, 8); | |
455 | ||
456 | err = smp_e(tfm_aes, k, _r); | |
457 | if (err) | |
458 | BT_ERR("Encrypt data error"); | |
6a77083a JH |
459 | |
460 | return err; | |
461 | } | |
462 | ||
a4770e11 | 463 | static int smp_ah(struct crypto_cipher *tfm, const u8 irk[16], |
cd082797 | 464 | const u8 r[3], u8 res[3]) |
60478054 | 465 | { |
943a732a | 466 | u8 _res[16]; |
60478054 JH |
467 | int err; |
468 | ||
469 | /* r' = padding || r */ | |
943a732a JH |
470 | memcpy(_res, r, 3); |
471 | memset(_res + 3, 0, 13); | |
60478054 | 472 | |
943a732a | 473 | err = smp_e(tfm, irk, _res); |
60478054 JH |
474 | if (err) { |
475 | BT_ERR("Encrypt error"); | |
476 | return err; | |
477 | } | |
478 | ||
479 | /* The output of the random address function ah is: | |
c5080d42 | 480 | * ah(k, r) = e(k, r') mod 2^24 |
60478054 JH |
481 | * The output of the security function e is then truncated to 24 bits |
482 | * by taking the least significant 24 bits of the output of e as the | |
483 | * result of ah. | |
484 | */ | |
943a732a | 485 | memcpy(res, _res, 3); |
60478054 JH |
486 | |
487 | return 0; | |
488 | } | |
489 | ||
cd082797 JH |
490 | bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16], |
491 | const bdaddr_t *bdaddr) | |
60478054 | 492 | { |
defce9e8 | 493 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 494 | struct smp_dev *smp; |
60478054 JH |
495 | u8 hash[3]; |
496 | int err; | |
497 | ||
defce9e8 JH |
498 | if (!chan || !chan->data) |
499 | return false; | |
500 | ||
88a479d9 | 501 | smp = chan->data; |
defce9e8 | 502 | |
60478054 JH |
503 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); |
504 | ||
88a479d9 | 505 | err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash); |
60478054 JH |
506 | if (err) |
507 | return false; | |
508 | ||
509 | return !memcmp(bdaddr->b, hash, 3); | |
510 | } | |
511 | ||
cd082797 | 512 | int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa) |
b1e2b3ae | 513 | { |
defce9e8 | 514 | struct l2cap_chan *chan = hdev->smp_data; |
88a479d9 | 515 | struct smp_dev *smp; |
b1e2b3ae JH |
516 | int err; |
517 | ||
defce9e8 JH |
518 | if (!chan || !chan->data) |
519 | return -EOPNOTSUPP; | |
520 | ||
88a479d9 | 521 | smp = chan->data; |
defce9e8 | 522 | |
b1e2b3ae JH |
523 | get_random_bytes(&rpa->b[3], 3); |
524 | ||
525 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
526 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
527 | ||
88a479d9 | 528 | err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b); |
b1e2b3ae JH |
529 | if (err < 0) |
530 | return err; | |
531 | ||
532 | BT_DBG("RPA %pMR", rpa); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
60a27d65 MH |
537 | int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16]) |
538 | { | |
539 | struct l2cap_chan *chan = hdev->smp_data; | |
540 | struct smp_dev *smp; | |
541 | int err; | |
542 | ||
543 | if (!chan || !chan->data) | |
544 | return -EOPNOTSUPP; | |
545 | ||
546 | smp = chan->data; | |
547 | ||
548 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { | |
549 | BT_DBG("Using debug keys"); | |
550 | memcpy(smp->local_pk, debug_pk, 64); | |
551 | memcpy(smp->local_sk, debug_sk, 32); | |
552 | smp->debug_key = true; | |
553 | } else { | |
554 | while (true) { | |
555 | /* Generate local key pair for Secure Connections */ | |
556 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
557 | return -EIO; | |
558 | ||
559 | /* This is unlikely, but we need to check that | |
560 | * we didn't accidentially generate a debug key. | |
561 | */ | |
562 | if (memcmp(smp->local_sk, debug_sk, 32)) | |
563 | break; | |
564 | } | |
565 | smp->debug_key = false; | |
566 | } | |
567 | ||
568 | SMP_DBG("OOB Public Key X: %32phN", smp->local_pk); | |
569 | SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32); | |
570 | SMP_DBG("OOB Private Key: %32phN", smp->local_sk); | |
571 | ||
fb334fee | 572 | get_random_bytes(smp->local_rand, 16); |
60a27d65 MH |
573 | |
574 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk, | |
fb334fee | 575 | smp->local_rand, 0, hash); |
60a27d65 MH |
576 | if (err < 0) |
577 | return err; | |
578 | ||
fb334fee | 579 | memcpy(rand, smp->local_rand, 16); |
60a27d65 MH |
580 | |
581 | return 0; | |
582 | } | |
583 | ||
5d88cc73 | 584 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
eb492e01 | 585 | { |
5d88cc73 | 586 | struct l2cap_chan *chan = conn->smp; |
b68fda68 | 587 | struct smp_chan *smp; |
5d88cc73 JH |
588 | struct kvec iv[2]; |
589 | struct msghdr msg; | |
eb492e01 | 590 | |
5d88cc73 JH |
591 | if (!chan) |
592 | return; | |
eb492e01 | 593 | |
5d88cc73 | 594 | BT_DBG("code 0x%2.2x", code); |
eb492e01 | 595 | |
5d88cc73 JH |
596 | iv[0].iov_base = &code; |
597 | iv[0].iov_len = 1; | |
eb492e01 | 598 | |
5d88cc73 JH |
599 | iv[1].iov_base = data; |
600 | iv[1].iov_len = len; | |
eb492e01 | 601 | |
5d88cc73 | 602 | memset(&msg, 0, sizeof(msg)); |
eb492e01 | 603 | |
17836394 | 604 | iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len); |
eb492e01 | 605 | |
5d88cc73 | 606 | l2cap_chan_send(chan, &msg, 1 + len); |
e2dcd113 | 607 | |
b68fda68 JH |
608 | if (!chan->data) |
609 | return; | |
610 | ||
611 | smp = chan->data; | |
612 | ||
613 | cancel_delayed_work_sync(&smp->security_timer); | |
1b0921d6 | 614 | schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
615 | } |
616 | ||
d2eb9e10 | 617 | static u8 authreq_to_seclevel(u8 authreq) |
2b64d153 | 618 | { |
d2eb9e10 JH |
619 | if (authreq & SMP_AUTH_MITM) { |
620 | if (authreq & SMP_AUTH_SC) | |
621 | return BT_SECURITY_FIPS; | |
622 | else | |
623 | return BT_SECURITY_HIGH; | |
624 | } else { | |
2b64d153 | 625 | return BT_SECURITY_MEDIUM; |
d2eb9e10 | 626 | } |
2b64d153 BG |
627 | } |
628 | ||
629 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
630 | { | |
631 | switch (sec_level) { | |
d2eb9e10 | 632 | case BT_SECURITY_FIPS: |
2b64d153 BG |
633 | case BT_SECURITY_HIGH: |
634 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
635 | case BT_SECURITY_MEDIUM: | |
636 | return SMP_AUTH_BONDING; | |
637 | default: | |
638 | return SMP_AUTH_NONE; | |
639 | } | |
640 | } | |
641 | ||
b8e66eac | 642 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
643 | struct smp_cmd_pairing *req, |
644 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 645 | { |
5d88cc73 JH |
646 | struct l2cap_chan *chan = conn->smp; |
647 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
648 | struct hci_conn *hcon = conn->hcon; |
649 | struct hci_dev *hdev = hcon->hdev; | |
02b05bd8 | 650 | u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT; |
54790f73 | 651 | |
d7a5a11d | 652 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
7ee4ea36 MH |
653 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
654 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 655 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
656 | } else { |
657 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
658 | } |
659 | ||
d7a5a11d | 660 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
fd349c02 JH |
661 | remote_dist |= SMP_DIST_ID_KEY; |
662 | ||
d7a5a11d | 663 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
863efaf2 JH |
664 | local_dist |= SMP_DIST_ID_KEY; |
665 | ||
d7a5a11d | 666 | if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) && |
02b05bd8 JH |
667 | (authreq & SMP_AUTH_SC)) { |
668 | struct oob_data *oob_data; | |
669 | u8 bdaddr_type; | |
670 | ||
d7a5a11d | 671 | if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) { |
df8e1a4c JH |
672 | local_dist |= SMP_DIST_LINK_KEY; |
673 | remote_dist |= SMP_DIST_LINK_KEY; | |
674 | } | |
02b05bd8 JH |
675 | |
676 | if (hcon->dst_type == ADDR_LE_DEV_PUBLIC) | |
677 | bdaddr_type = BDADDR_LE_PUBLIC; | |
678 | else | |
679 | bdaddr_type = BDADDR_LE_RANDOM; | |
680 | ||
681 | oob_data = hci_find_remote_oob_data(hdev, &hcon->dst, | |
682 | bdaddr_type); | |
4775a4ea | 683 | if (oob_data && oob_data->present) { |
1a8bab4f | 684 | set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags); |
02b05bd8 | 685 | oob_flag = SMP_OOB_PRESENT; |
a29b0733 | 686 | memcpy(smp->rr, oob_data->rand256, 16); |
02b05bd8 | 687 | memcpy(smp->pcnf, oob_data->hash256, 16); |
bc07cd69 MH |
688 | SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf); |
689 | SMP_DBG("OOB Remote Random: %16phN", smp->rr); | |
02b05bd8 JH |
690 | } |
691 | ||
df8e1a4c JH |
692 | } else { |
693 | authreq &= ~SMP_AUTH_SC; | |
694 | } | |
695 | ||
54790f73 VCG |
696 | if (rsp == NULL) { |
697 | req->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 698 | req->oob_flag = oob_flag; |
2fd36558 | 699 | req->max_key_size = SMP_DEV(hdev)->max_key_size; |
fd349c02 JH |
700 | req->init_key_dist = local_dist; |
701 | req->resp_key_dist = remote_dist; | |
0edb14de | 702 | req->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
703 | |
704 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
705 | return; |
706 | } | |
707 | ||
708 | rsp->io_capability = conn->hcon->io_capability; | |
02b05bd8 | 709 | rsp->oob_flag = oob_flag; |
2fd36558 | 710 | rsp->max_key_size = SMP_DEV(hdev)->max_key_size; |
fd349c02 JH |
711 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
712 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
0edb14de | 713 | rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev)); |
fd349c02 JH |
714 | |
715 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
716 | } |
717 | ||
3158c50c VCG |
718 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
719 | { | |
5d88cc73 | 720 | struct l2cap_chan *chan = conn->smp; |
2fd36558 | 721 | struct hci_dev *hdev = conn->hcon->hdev; |
5d88cc73 | 722 | struct smp_chan *smp = chan->data; |
1c1def09 | 723 | |
2fd36558 JH |
724 | if (max_key_size > SMP_DEV(hdev)->max_key_size || |
725 | max_key_size < SMP_MIN_ENC_KEY_SIZE) | |
3158c50c VCG |
726 | return SMP_ENC_KEY_SIZE; |
727 | ||
f7aa611a | 728 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
729 | |
730 | return 0; | |
731 | } | |
732 | ||
6f48e260 JH |
733 | static void smp_chan_destroy(struct l2cap_conn *conn) |
734 | { | |
735 | struct l2cap_chan *chan = conn->smp; | |
736 | struct smp_chan *smp = chan->data; | |
923e2414 | 737 | struct hci_conn *hcon = conn->hcon; |
6f48e260 JH |
738 | bool complete; |
739 | ||
740 | BUG_ON(!smp); | |
741 | ||
742 | cancel_delayed_work_sync(&smp->security_timer); | |
6f48e260 | 743 | |
6f48e260 | 744 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
923e2414 | 745 | mgmt_smp_complete(hcon, complete); |
6f48e260 | 746 | |
276812ec MH |
747 | kzfree(smp->csrk); |
748 | kzfree(smp->slave_csrk); | |
749 | kzfree(smp->link_key); | |
6f48e260 | 750 | |
a4770e11 | 751 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 752 | crypto_free_shash(smp->tfm_cmac); |
6f48e260 | 753 | |
923e2414 JH |
754 | /* Ensure that we don't leave any debug key around if debug key |
755 | * support hasn't been explicitly enabled. | |
756 | */ | |
757 | if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG && | |
d7a5a11d | 758 | !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) { |
923e2414 JH |
759 | list_del_rcu(&smp->ltk->list); |
760 | kfree_rcu(smp->ltk, rcu); | |
761 | smp->ltk = NULL; | |
762 | } | |
763 | ||
6f48e260 JH |
764 | /* If pairing failed clean up any keys we might have */ |
765 | if (!complete) { | |
766 | if (smp->ltk) { | |
970d0f1b JH |
767 | list_del_rcu(&smp->ltk->list); |
768 | kfree_rcu(smp->ltk, rcu); | |
6f48e260 JH |
769 | } |
770 | ||
771 | if (smp->slave_ltk) { | |
970d0f1b JH |
772 | list_del_rcu(&smp->slave_ltk->list); |
773 | kfree_rcu(smp->slave_ltk, rcu); | |
6f48e260 JH |
774 | } |
775 | ||
776 | if (smp->remote_irk) { | |
adae20cb JH |
777 | list_del_rcu(&smp->remote_irk->list); |
778 | kfree_rcu(smp->remote_irk, rcu); | |
6f48e260 JH |
779 | } |
780 | } | |
781 | ||
782 | chan->data = NULL; | |
276812ec | 783 | kzfree(smp); |
923e2414 | 784 | hci_conn_drop(hcon); |
6f48e260 JH |
785 | } |
786 | ||
84794e11 | 787 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 788 | { |
bab73cb6 | 789 | struct hci_conn *hcon = conn->hcon; |
b68fda68 | 790 | struct l2cap_chan *chan = conn->smp; |
bab73cb6 | 791 | |
84794e11 | 792 | if (reason) |
4f957a76 | 793 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 794 | &reason); |
4f957a76 | 795 | |
e1e930f5 | 796 | mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 797 | |
fc75cc86 | 798 | if (chan->data) |
f1c09c07 | 799 | smp_chan_destroy(conn); |
4f957a76 BG |
800 | } |
801 | ||
2b64d153 BG |
802 | #define JUST_WORKS 0x00 |
803 | #define JUST_CFM 0x01 | |
804 | #define REQ_PASSKEY 0x02 | |
805 | #define CFM_PASSKEY 0x03 | |
806 | #define REQ_OOB 0x04 | |
5e3d3d9b | 807 | #define DSP_PASSKEY 0x05 |
2b64d153 BG |
808 | #define OVERLAP 0xFF |
809 | ||
810 | static const u8 gen_method[5][5] = { | |
811 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
812 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
813 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
814 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
815 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
816 | }; | |
817 | ||
5e3d3d9b JH |
818 | static const u8 sc_method[5][5] = { |
819 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
820 | { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
821 | { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY }, | |
822 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
823 | { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
824 | }; | |
825 | ||
581370cc JH |
826 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
827 | { | |
2bcd4003 JH |
828 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
829 | * converted later to JUST_WORKS if we're initiators. | |
830 | */ | |
581370cc JH |
831 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
832 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 833 | return JUST_CFM; |
581370cc | 834 | |
5e3d3d9b JH |
835 | if (test_bit(SMP_FLAG_SC, &smp->flags)) |
836 | return sc_method[remote_io][local_io]; | |
837 | ||
581370cc JH |
838 | return gen_method[remote_io][local_io]; |
839 | } | |
840 | ||
2b64d153 BG |
841 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
842 | u8 local_io, u8 remote_io) | |
843 | { | |
844 | struct hci_conn *hcon = conn->hcon; | |
5d88cc73 JH |
845 | struct l2cap_chan *chan = conn->smp; |
846 | struct smp_chan *smp = chan->data; | |
2b64d153 BG |
847 | u32 passkey = 0; |
848 | int ret = 0; | |
849 | ||
850 | /* Initialize key for JUST WORKS */ | |
851 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 852 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
853 | |
854 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
855 | ||
2bcd4003 JH |
856 | /* If neither side wants MITM, either "just" confirm an incoming |
857 | * request or use just-works for outgoing ones. The JUST_CFM | |
858 | * will be converted to JUST_WORKS if necessary later in this | |
859 | * function. If either side has MITM look up the method from the | |
860 | * table. | |
861 | */ | |
581370cc | 862 | if (!(auth & SMP_AUTH_MITM)) |
783e0574 | 863 | smp->method = JUST_CFM; |
2b64d153 | 864 | else |
783e0574 | 865 | smp->method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 866 | |
a82505c7 | 867 | /* Don't confirm locally initiated pairing attempts */ |
783e0574 JH |
868 | if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, |
869 | &smp->flags)) | |
870 | smp->method = JUST_WORKS; | |
a82505c7 | 871 | |
02f3e254 | 872 | /* Don't bother user space with no IO capabilities */ |
783e0574 JH |
873 | if (smp->method == JUST_CFM && |
874 | hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
875 | smp->method = JUST_WORKS; | |
02f3e254 | 876 | |
2b64d153 | 877 | /* If Just Works, Continue with Zero TK */ |
783e0574 | 878 | if (smp->method == JUST_WORKS) { |
4a74d658 | 879 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
880 | return 0; |
881 | } | |
882 | ||
19c5ce9c JH |
883 | /* If this function is used for SC -> legacy fallback we |
884 | * can only recover the just-works case. | |
885 | */ | |
886 | if (test_bit(SMP_FLAG_SC, &smp->flags)) | |
887 | return -EINVAL; | |
888 | ||
2b64d153 | 889 | /* Not Just Works/Confirm results in MITM Authentication */ |
783e0574 | 890 | if (smp->method != JUST_CFM) { |
4a74d658 | 891 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
5eb596f5 JH |
892 | if (hcon->pending_sec_level < BT_SECURITY_HIGH) |
893 | hcon->pending_sec_level = BT_SECURITY_HIGH; | |
894 | } | |
2b64d153 BG |
895 | |
896 | /* If both devices have Keyoard-Display I/O, the master | |
897 | * Confirms and the slave Enters the passkey. | |
898 | */ | |
783e0574 | 899 | if (smp->method == OVERLAP) { |
40bef302 | 900 | if (hcon->role == HCI_ROLE_MASTER) |
783e0574 | 901 | smp->method = CFM_PASSKEY; |
2b64d153 | 902 | else |
783e0574 | 903 | smp->method = REQ_PASSKEY; |
2b64d153 BG |
904 | } |
905 | ||
01ad34d2 | 906 | /* Generate random passkey. */ |
783e0574 | 907 | if (smp->method == CFM_PASSKEY) { |
943a732a | 908 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
909 | get_random_bytes(&passkey, sizeof(passkey)); |
910 | passkey %= 1000000; | |
943a732a | 911 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 912 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 913 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
914 | } |
915 | ||
783e0574 | 916 | if (smp->method == REQ_PASSKEY) |
ce39fb4e | 917 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 918 | hcon->type, hcon->dst_type); |
783e0574 | 919 | else if (smp->method == JUST_CFM) |
4eb65e66 JH |
920 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, |
921 | hcon->type, hcon->dst_type, | |
922 | passkey, 1); | |
2b64d153 | 923 | else |
01ad34d2 | 924 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 925 | hcon->type, hcon->dst_type, |
39adbffe | 926 | passkey, 0); |
2b64d153 | 927 | |
2b64d153 BG |
928 | return ret; |
929 | } | |
930 | ||
1cc61144 | 931 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 932 | { |
8aab4757 | 933 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
934 | struct smp_cmd_pairing_confirm cp; |
935 | int ret; | |
8aab4757 VCG |
936 | |
937 | BT_DBG("conn %p", conn); | |
938 | ||
e491eaf3 | 939 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 940 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
941 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
942 | cp.confirm_val); | |
1cc61144 JH |
943 | if (ret) |
944 | return SMP_UNSPECIFIED; | |
8aab4757 | 945 | |
4a74d658 | 946 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 947 | |
8aab4757 VCG |
948 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
949 | ||
b28b4943 JH |
950 | if (conn->hcon->out) |
951 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
952 | else | |
953 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
954 | ||
1cc61144 | 955 | return 0; |
8aab4757 VCG |
956 | } |
957 | ||
861580a9 | 958 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 959 | { |
8aab4757 VCG |
960 | struct l2cap_conn *conn = smp->conn; |
961 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 962 | u8 confirm[16]; |
8aab4757 VCG |
963 | int ret; |
964 | ||
ec70f36f | 965 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 966 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
967 | |
968 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
969 | ||
e491eaf3 | 970 | ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 971 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 972 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
973 | if (ret) |
974 | return SMP_UNSPECIFIED; | |
8aab4757 | 975 | |
8aab4757 VCG |
976 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
977 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 978 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
979 | } |
980 | ||
981 | if (hcon->out) { | |
fe39c7b2 MH |
982 | u8 stk[16]; |
983 | __le64 rand = 0; | |
984 | __le16 ediv = 0; | |
8aab4757 | 985 | |
e491eaf3 | 986 | smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 987 | |
861580a9 JH |
988 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
989 | return SMP_UNSPECIFIED; | |
8aab4757 | 990 | |
8b76ce34 | 991 | hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size); |
f7aa611a | 992 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 993 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 994 | } else { |
fff3490f | 995 | u8 stk[16], auth; |
fe39c7b2 MH |
996 | __le64 rand = 0; |
997 | __le16 ediv = 0; | |
8aab4757 | 998 | |
943a732a JH |
999 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
1000 | smp->prnd); | |
8aab4757 | 1001 | |
e491eaf3 | 1002 | smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 1003 | |
fff3490f JH |
1004 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
1005 | auth = 1; | |
1006 | else | |
1007 | auth = 0; | |
1008 | ||
7d5843b7 JH |
1009 | /* Even though there's no _SLAVE suffix this is the |
1010 | * slave STK we're adding for later lookup (the master | |
1011 | * STK never needs to be stored). | |
1012 | */ | |
ce39fb4e | 1013 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1014 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
1015 | } |
1016 | ||
861580a9 | 1017 | return 0; |
8aab4757 VCG |
1018 | } |
1019 | ||
44f1a7ab JH |
1020 | static void smp_notify_keys(struct l2cap_conn *conn) |
1021 | { | |
1022 | struct l2cap_chan *chan = conn->smp; | |
1023 | struct smp_chan *smp = chan->data; | |
1024 | struct hci_conn *hcon = conn->hcon; | |
1025 | struct hci_dev *hdev = hcon->hdev; | |
1026 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; | |
1027 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1028 | bool persistent; | |
1029 | ||
cad20c27 JH |
1030 | if (hcon->type == ACL_LINK) { |
1031 | if (hcon->key_type == HCI_LK_DEBUG_COMBINATION) | |
1032 | persistent = false; | |
1033 | else | |
1034 | persistent = !test_bit(HCI_CONN_FLUSH_KEY, | |
1035 | &hcon->flags); | |
1036 | } else { | |
1037 | /* The LTKs, IRKs and CSRKs should be persistent only if | |
1038 | * both sides had the bonding bit set in their | |
1039 | * authentication requests. | |
1040 | */ | |
1041 | persistent = !!((req->auth_req & rsp->auth_req) & | |
1042 | SMP_AUTH_BONDING); | |
1043 | } | |
1044 | ||
44f1a7ab | 1045 | if (smp->remote_irk) { |
cad20c27 JH |
1046 | mgmt_new_irk(hdev, smp->remote_irk, persistent); |
1047 | ||
44f1a7ab JH |
1048 | /* Now that user space can be considered to know the |
1049 | * identity address track the connection based on it | |
b5ae344d | 1050 | * from now on (assuming this is an LE link). |
44f1a7ab | 1051 | */ |
b5ae344d JH |
1052 | if (hcon->type == LE_LINK) { |
1053 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1054 | hcon->dst_type = smp->remote_irk->addr_type; | |
1055 | queue_work(hdev->workqueue, &conn->id_addr_update_work); | |
1056 | } | |
44f1a7ab JH |
1057 | } |
1058 | ||
44f1a7ab JH |
1059 | if (smp->csrk) { |
1060 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1061 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
1062 | mgmt_new_csrk(hdev, smp->csrk, persistent); | |
1063 | } | |
1064 | ||
1065 | if (smp->slave_csrk) { | |
1066 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1067 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
1068 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); | |
1069 | } | |
1070 | ||
1071 | if (smp->ltk) { | |
1072 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1073 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
1074 | mgmt_new_ltk(hdev, smp->ltk, persistent); | |
1075 | } | |
1076 | ||
1077 | if (smp->slave_ltk) { | |
1078 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1079 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
1080 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); | |
1081 | } | |
6a77083a JH |
1082 | |
1083 | if (smp->link_key) { | |
e3befab9 JH |
1084 | struct link_key *key; |
1085 | u8 type; | |
1086 | ||
1087 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1088 | type = HCI_LK_DEBUG_COMBINATION; | |
1089 | else if (hcon->sec_level == BT_SECURITY_FIPS) | |
1090 | type = HCI_LK_AUTH_COMBINATION_P256; | |
1091 | else | |
1092 | type = HCI_LK_UNAUTH_COMBINATION_P256; | |
1093 | ||
1094 | key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst, | |
1095 | smp->link_key, type, 0, &persistent); | |
1096 | if (key) { | |
1097 | mgmt_new_link_key(hdev, key, persistent); | |
1098 | ||
1099 | /* Don't keep debug keys around if the relevant | |
1100 | * flag is not set. | |
1101 | */ | |
d7a5a11d | 1102 | if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) && |
e3befab9 JH |
1103 | key->type == HCI_LK_DEBUG_COMBINATION) { |
1104 | list_del_rcu(&key->list); | |
1105 | kfree_rcu(key, rcu); | |
1106 | } | |
1107 | } | |
6a77083a JH |
1108 | } |
1109 | } | |
1110 | ||
d3e54a87 JH |
1111 | static void sc_add_ltk(struct smp_chan *smp) |
1112 | { | |
1113 | struct hci_conn *hcon = smp->conn->hcon; | |
1114 | u8 key_type, auth; | |
1115 | ||
1116 | if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags)) | |
1117 | key_type = SMP_LTK_P256_DEBUG; | |
1118 | else | |
1119 | key_type = SMP_LTK_P256; | |
1120 | ||
1121 | if (hcon->pending_sec_level == BT_SECURITY_FIPS) | |
1122 | auth = 1; | |
1123 | else | |
1124 | auth = 0; | |
1125 | ||
d3e54a87 JH |
1126 | smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
1127 | key_type, auth, smp->tk, smp->enc_key_size, | |
1128 | 0, 0); | |
1129 | } | |
1130 | ||
6a77083a JH |
1131 | static void sc_generate_link_key(struct smp_chan *smp) |
1132 | { | |
1133 | /* These constants are as specified in the core specification. | |
1134 | * In ASCII they spell out to 'tmp1' and 'lebr'. | |
1135 | */ | |
1136 | const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 }; | |
1137 | const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
1138 | ||
1139 | smp->link_key = kzalloc(16, GFP_KERNEL); | |
1140 | if (!smp->link_key) | |
1141 | return; | |
1142 | ||
1143 | if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) { | |
276812ec | 1144 | kzfree(smp->link_key); |
6a77083a JH |
1145 | smp->link_key = NULL; |
1146 | return; | |
1147 | } | |
1148 | ||
1149 | if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) { | |
276812ec | 1150 | kzfree(smp->link_key); |
6a77083a JH |
1151 | smp->link_key = NULL; |
1152 | return; | |
1153 | } | |
44f1a7ab JH |
1154 | } |
1155 | ||
b28b4943 JH |
1156 | static void smp_allow_key_dist(struct smp_chan *smp) |
1157 | { | |
1158 | /* Allow the first expected phase 3 PDU. The rest of the PDUs | |
1159 | * will be allowed in each PDU handler to ensure we receive | |
1160 | * them in the correct order. | |
1161 | */ | |
1162 | if (smp->remote_key_dist & SMP_DIST_ENC_KEY) | |
1163 | SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO); | |
1164 | else if (smp->remote_key_dist & SMP_DIST_ID_KEY) | |
1165 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
1166 | else if (smp->remote_key_dist & SMP_DIST_SIGN) | |
1167 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
1168 | } | |
1169 | ||
b5ae344d JH |
1170 | static void sc_generate_ltk(struct smp_chan *smp) |
1171 | { | |
1172 | /* These constants are as specified in the core specification. | |
1173 | * In ASCII they spell out to 'tmp2' and 'brle'. | |
1174 | */ | |
1175 | const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 }; | |
1176 | const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 }; | |
1177 | struct hci_conn *hcon = smp->conn->hcon; | |
1178 | struct hci_dev *hdev = hcon->hdev; | |
1179 | struct link_key *key; | |
1180 | ||
1181 | key = hci_find_link_key(hdev, &hcon->dst); | |
1182 | if (!key) { | |
1183 | BT_ERR("%s No Link Key found to generate LTK", hdev->name); | |
1184 | return; | |
1185 | } | |
1186 | ||
1187 | if (key->type == HCI_LK_DEBUG_COMBINATION) | |
1188 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1189 | ||
1190 | if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk)) | |
1191 | return; | |
1192 | ||
1193 | if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk)) | |
1194 | return; | |
1195 | ||
1196 | sc_add_ltk(smp); | |
1197 | } | |
1198 | ||
d6268e86 | 1199 | static void smp_distribute_keys(struct smp_chan *smp) |
44f1a7ab JH |
1200 | { |
1201 | struct smp_cmd_pairing *req, *rsp; | |
86d1407c | 1202 | struct l2cap_conn *conn = smp->conn; |
44f1a7ab JH |
1203 | struct hci_conn *hcon = conn->hcon; |
1204 | struct hci_dev *hdev = hcon->hdev; | |
1205 | __u8 *keydist; | |
1206 | ||
1207 | BT_DBG("conn %p", conn); | |
1208 | ||
44f1a7ab JH |
1209 | rsp = (void *) &smp->prsp[1]; |
1210 | ||
1211 | /* The responder sends its keys first */ | |
b28b4943 JH |
1212 | if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) { |
1213 | smp_allow_key_dist(smp); | |
86d1407c | 1214 | return; |
b28b4943 | 1215 | } |
44f1a7ab JH |
1216 | |
1217 | req = (void *) &smp->preq[1]; | |
1218 | ||
1219 | if (hcon->out) { | |
1220 | keydist = &rsp->init_key_dist; | |
1221 | *keydist &= req->init_key_dist; | |
1222 | } else { | |
1223 | keydist = &rsp->resp_key_dist; | |
1224 | *keydist &= req->resp_key_dist; | |
1225 | } | |
1226 | ||
6a77083a | 1227 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
b5ae344d | 1228 | if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY)) |
6a77083a | 1229 | sc_generate_link_key(smp); |
b5ae344d JH |
1230 | if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY)) |
1231 | sc_generate_ltk(smp); | |
6a77083a JH |
1232 | |
1233 | /* Clear the keys which are generated but not distributed */ | |
1234 | *keydist &= ~SMP_SC_NO_DIST; | |
1235 | } | |
1236 | ||
44f1a7ab JH |
1237 | BT_DBG("keydist 0x%x", *keydist); |
1238 | ||
1239 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1240 | struct smp_cmd_encrypt_info enc; | |
1241 | struct smp_cmd_master_ident ident; | |
1242 | struct smp_ltk *ltk; | |
1243 | u8 authenticated; | |
1244 | __le16 ediv; | |
1245 | __le64 rand; | |
1246 | ||
1fc62c52 JH |
1247 | /* Make sure we generate only the significant amount of |
1248 | * bytes based on the encryption key size, and set the rest | |
1249 | * of the value to zeroes. | |
1250 | */ | |
1251 | get_random_bytes(enc.ltk, smp->enc_key_size); | |
1252 | memset(enc.ltk + smp->enc_key_size, 0, | |
1253 | sizeof(enc.ltk) - smp->enc_key_size); | |
1254 | ||
44f1a7ab JH |
1255 | get_random_bytes(&ediv, sizeof(ediv)); |
1256 | get_random_bytes(&rand, sizeof(rand)); | |
1257 | ||
1258 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1259 | ||
1260 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; | |
1261 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, | |
1262 | SMP_LTK_SLAVE, authenticated, enc.ltk, | |
1263 | smp->enc_key_size, ediv, rand); | |
1264 | smp->slave_ltk = ltk; | |
1265 | ||
1266 | ident.ediv = ediv; | |
1267 | ident.rand = rand; | |
1268 | ||
1269 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1270 | ||
1271 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1272 | } | |
1273 | ||
1274 | if (*keydist & SMP_DIST_ID_KEY) { | |
1275 | struct smp_cmd_ident_addr_info addrinfo; | |
1276 | struct smp_cmd_ident_info idinfo; | |
1277 | ||
1278 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); | |
1279 | ||
1280 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1281 | ||
1282 | /* The hci_conn contains the local identity address | |
1283 | * after the connection has been established. | |
1284 | * | |
1285 | * This is true even when the connection has been | |
1286 | * established using a resolvable random address. | |
1287 | */ | |
1288 | bacpy(&addrinfo.bdaddr, &hcon->src); | |
1289 | addrinfo.addr_type = hcon->src_type; | |
1290 | ||
1291 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1292 | &addrinfo); | |
1293 | ||
1294 | *keydist &= ~SMP_DIST_ID_KEY; | |
1295 | } | |
1296 | ||
1297 | if (*keydist & SMP_DIST_SIGN) { | |
1298 | struct smp_cmd_sign_info sign; | |
1299 | struct smp_csrk *csrk; | |
1300 | ||
1301 | /* Generate a new random key */ | |
1302 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1303 | ||
1304 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1305 | if (csrk) { | |
4cd3928a JH |
1306 | if (hcon->sec_level > BT_SECURITY_MEDIUM) |
1307 | csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED; | |
1308 | else | |
1309 | csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED; | |
44f1a7ab JH |
1310 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); |
1311 | } | |
1312 | smp->slave_csrk = csrk; | |
1313 | ||
1314 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1315 | ||
1316 | *keydist &= ~SMP_DIST_SIGN; | |
1317 | } | |
1318 | ||
1319 | /* If there are still keys to be received wait for them */ | |
b28b4943 JH |
1320 | if (smp->remote_key_dist & KEY_DIST_MASK) { |
1321 | smp_allow_key_dist(smp); | |
86d1407c | 1322 | return; |
b28b4943 | 1323 | } |
44f1a7ab | 1324 | |
44f1a7ab JH |
1325 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1326 | smp_notify_keys(conn); | |
1327 | ||
1328 | smp_chan_destroy(conn); | |
44f1a7ab JH |
1329 | } |
1330 | ||
b68fda68 JH |
1331 | static void smp_timeout(struct work_struct *work) |
1332 | { | |
1333 | struct smp_chan *smp = container_of(work, struct smp_chan, | |
1334 | security_timer.work); | |
1335 | struct l2cap_conn *conn = smp->conn; | |
1336 | ||
1337 | BT_DBG("conn %p", conn); | |
1338 | ||
1e91c29e | 1339 | hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM); |
b68fda68 JH |
1340 | } |
1341 | ||
8aab4757 VCG |
1342 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
1343 | { | |
5d88cc73 | 1344 | struct l2cap_chan *chan = conn->smp; |
8aab4757 VCG |
1345 | struct smp_chan *smp; |
1346 | ||
f1560463 | 1347 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
fc75cc86 | 1348 | if (!smp) |
8aab4757 VCG |
1349 | return NULL; |
1350 | ||
a4770e11 | 1351 | smp->tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
6a7bd103 | 1352 | if (IS_ERR(smp->tfm_aes)) { |
a4770e11 | 1353 | BT_ERR("Unable to create AES crypto context"); |
276812ec | 1354 | kzfree(smp); |
6a7bd103 JH |
1355 | return NULL; |
1356 | } | |
1357 | ||
71af2f6b | 1358 | smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
407cecf6 JH |
1359 | if (IS_ERR(smp->tfm_cmac)) { |
1360 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 1361 | crypto_free_cipher(smp->tfm_aes); |
276812ec | 1362 | kzfree(smp); |
407cecf6 JH |
1363 | return NULL; |
1364 | } | |
1365 | ||
8aab4757 | 1366 | smp->conn = conn; |
5d88cc73 | 1367 | chan->data = smp; |
8aab4757 | 1368 | |
b28b4943 JH |
1369 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL); |
1370 | ||
b68fda68 JH |
1371 | INIT_DELAYED_WORK(&smp->security_timer, smp_timeout); |
1372 | ||
8aab4757 VCG |
1373 | hci_conn_hold(conn->hcon); |
1374 | ||
1375 | return smp; | |
1376 | } | |
1377 | ||
760b018b JH |
1378 | static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16]) |
1379 | { | |
1380 | struct hci_conn *hcon = smp->conn->hcon; | |
1381 | u8 *na, *nb, a[7], b[7]; | |
1382 | ||
1383 | if (hcon->out) { | |
1384 | na = smp->prnd; | |
1385 | nb = smp->rrnd; | |
1386 | } else { | |
1387 | na = smp->rrnd; | |
1388 | nb = smp->prnd; | |
1389 | } | |
1390 | ||
1391 | memcpy(a, &hcon->init_addr, 6); | |
1392 | memcpy(b, &hcon->resp_addr, 6); | |
1393 | a[6] = hcon->init_addr_type; | |
1394 | b[6] = hcon->resp_addr_type; | |
1395 | ||
1396 | return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk); | |
1397 | } | |
1398 | ||
38606f14 | 1399 | static void sc_dhkey_check(struct smp_chan *smp) |
760b018b JH |
1400 | { |
1401 | struct hci_conn *hcon = smp->conn->hcon; | |
1402 | struct smp_cmd_dhkey_check check; | |
1403 | u8 a[7], b[7], *local_addr, *remote_addr; | |
1404 | u8 io_cap[3], r[16]; | |
1405 | ||
760b018b JH |
1406 | memcpy(a, &hcon->init_addr, 6); |
1407 | memcpy(b, &hcon->resp_addr, 6); | |
1408 | a[6] = hcon->init_addr_type; | |
1409 | b[6] = hcon->resp_addr_type; | |
1410 | ||
1411 | if (hcon->out) { | |
1412 | local_addr = a; | |
1413 | remote_addr = b; | |
1414 | memcpy(io_cap, &smp->preq[1], 3); | |
1415 | } else { | |
1416 | local_addr = b; | |
1417 | remote_addr = a; | |
1418 | memcpy(io_cap, &smp->prsp[1], 3); | |
1419 | } | |
1420 | ||
dddd3059 JH |
1421 | memset(r, 0, sizeof(r)); |
1422 | ||
1423 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
38606f14 | 1424 | put_unaligned_le32(hcon->passkey_notify, r); |
760b018b | 1425 | |
a29b0733 JH |
1426 | if (smp->method == REQ_OOB) |
1427 | memcpy(r, smp->rr, 16); | |
1428 | ||
760b018b JH |
1429 | smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap, |
1430 | local_addr, remote_addr, check.e); | |
1431 | ||
1432 | smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check); | |
dddd3059 JH |
1433 | } |
1434 | ||
38606f14 JH |
1435 | static u8 sc_passkey_send_confirm(struct smp_chan *smp) |
1436 | { | |
1437 | struct l2cap_conn *conn = smp->conn; | |
1438 | struct hci_conn *hcon = conn->hcon; | |
1439 | struct smp_cmd_pairing_confirm cfm; | |
1440 | u8 r; | |
1441 | ||
1442 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1443 | r |= 0x80; | |
1444 | ||
1445 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); | |
1446 | ||
1447 | if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r, | |
1448 | cfm.confirm_val)) | |
1449 | return SMP_UNSPECIFIED; | |
1450 | ||
1451 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
1452 | ||
1453 | return 0; | |
1454 | } | |
1455 | ||
1456 | static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op) | |
1457 | { | |
1458 | struct l2cap_conn *conn = smp->conn; | |
1459 | struct hci_conn *hcon = conn->hcon; | |
1460 | struct hci_dev *hdev = hcon->hdev; | |
1461 | u8 cfm[16], r; | |
1462 | ||
1463 | /* Ignore the PDU if we've already done 20 rounds (0 - 19) */ | |
1464 | if (smp->passkey_round >= 20) | |
1465 | return 0; | |
1466 | ||
1467 | switch (smp_op) { | |
1468 | case SMP_CMD_PAIRING_RANDOM: | |
1469 | r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01); | |
1470 | r |= 0x80; | |
1471 | ||
1472 | if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
1473 | smp->rrnd, r, cfm)) | |
1474 | return SMP_UNSPECIFIED; | |
1475 | ||
1476 | if (memcmp(smp->pcnf, cfm, 16)) | |
1477 | return SMP_CONFIRM_FAILED; | |
1478 | ||
1479 | smp->passkey_round++; | |
1480 | ||
1481 | if (smp->passkey_round == 20) { | |
1482 | /* Generate MacKey and LTK */ | |
1483 | if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk)) | |
1484 | return SMP_UNSPECIFIED; | |
1485 | } | |
1486 | ||
1487 | /* The round is only complete when the initiator | |
1488 | * receives pairing random. | |
1489 | */ | |
1490 | if (!hcon->out) { | |
1491 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1492 | sizeof(smp->prnd), smp->prnd); | |
d3e54a87 | 1493 | if (smp->passkey_round == 20) |
38606f14 | 1494 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
d3e54a87 | 1495 | else |
38606f14 | 1496 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); |
38606f14 JH |
1497 | return 0; |
1498 | } | |
1499 | ||
1500 | /* Start the next round */ | |
1501 | if (smp->passkey_round != 20) | |
1502 | return sc_passkey_round(smp, 0); | |
1503 | ||
1504 | /* Passkey rounds are complete - start DHKey Check */ | |
1505 | sc_dhkey_check(smp); | |
1506 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1507 | ||
1508 | break; | |
1509 | ||
1510 | case SMP_CMD_PAIRING_CONFIRM: | |
1511 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
1512 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
1513 | return 0; | |
1514 | } | |
1515 | ||
1516 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1517 | ||
1518 | if (hcon->out) { | |
1519 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
1520 | sizeof(smp->prnd), smp->prnd); | |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | return sc_passkey_send_confirm(smp); | |
1525 | ||
1526 | case SMP_CMD_PUBLIC_KEY: | |
1527 | default: | |
1528 | /* Initiating device starts the round */ | |
1529 | if (!hcon->out) | |
1530 | return 0; | |
1531 | ||
1532 | BT_DBG("%s Starting passkey round %u", hdev->name, | |
1533 | smp->passkey_round + 1); | |
1534 | ||
1535 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1536 | ||
1537 | return sc_passkey_send_confirm(smp); | |
1538 | } | |
1539 | ||
1540 | return 0; | |
1541 | } | |
1542 | ||
dddd3059 JH |
1543 | static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey) |
1544 | { | |
38606f14 JH |
1545 | struct l2cap_conn *conn = smp->conn; |
1546 | struct hci_conn *hcon = conn->hcon; | |
1547 | u8 smp_op; | |
1548 | ||
1549 | clear_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
1550 | ||
dddd3059 JH |
1551 | switch (mgmt_op) { |
1552 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1553 | smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED); | |
1554 | return 0; | |
1555 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
1556 | smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED); | |
1557 | return 0; | |
38606f14 JH |
1558 | case MGMT_OP_USER_PASSKEY_REPLY: |
1559 | hcon->passkey_notify = le32_to_cpu(passkey); | |
1560 | smp->passkey_round = 0; | |
1561 | ||
1562 | if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) | |
1563 | smp_op = SMP_CMD_PAIRING_CONFIRM; | |
1564 | else | |
1565 | smp_op = 0; | |
1566 | ||
1567 | if (sc_passkey_round(smp, smp_op)) | |
1568 | return -EIO; | |
1569 | ||
1570 | return 0; | |
dddd3059 JH |
1571 | } |
1572 | ||
d3e54a87 JH |
1573 | /* Initiator sends DHKey check first */ |
1574 | if (hcon->out) { | |
1575 | sc_dhkey_check(smp); | |
1576 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
1577 | } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) { | |
1578 | sc_dhkey_check(smp); | |
1579 | sc_add_ltk(smp); | |
1580 | } | |
760b018b JH |
1581 | |
1582 | return 0; | |
1583 | } | |
1584 | ||
2b64d153 BG |
1585 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
1586 | { | |
b10e8017 | 1587 | struct l2cap_conn *conn = hcon->l2cap_data; |
5d88cc73 | 1588 | struct l2cap_chan *chan; |
2b64d153 BG |
1589 | struct smp_chan *smp; |
1590 | u32 value; | |
fc75cc86 | 1591 | int err; |
2b64d153 BG |
1592 | |
1593 | BT_DBG(""); | |
1594 | ||
fc75cc86 | 1595 | if (!conn) |
2b64d153 BG |
1596 | return -ENOTCONN; |
1597 | ||
5d88cc73 JH |
1598 | chan = conn->smp; |
1599 | if (!chan) | |
1600 | return -ENOTCONN; | |
1601 | ||
fc75cc86 JH |
1602 | l2cap_chan_lock(chan); |
1603 | if (!chan->data) { | |
1604 | err = -ENOTCONN; | |
1605 | goto unlock; | |
1606 | } | |
1607 | ||
5d88cc73 | 1608 | smp = chan->data; |
2b64d153 | 1609 | |
760b018b JH |
1610 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1611 | err = sc_user_reply(smp, mgmt_op, passkey); | |
1612 | goto unlock; | |
1613 | } | |
1614 | ||
2b64d153 BG |
1615 | switch (mgmt_op) { |
1616 | case MGMT_OP_USER_PASSKEY_REPLY: | |
1617 | value = le32_to_cpu(passkey); | |
943a732a | 1618 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 1619 | BT_DBG("PassKey: %d", value); |
943a732a | 1620 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
1621 | /* Fall Through */ |
1622 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 1623 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
1624 | break; |
1625 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
1626 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 1627 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1628 | err = 0; |
1629 | goto unlock; | |
2b64d153 | 1630 | default: |
84794e11 | 1631 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
fc75cc86 JH |
1632 | err = -EOPNOTSUPP; |
1633 | goto unlock; | |
2b64d153 BG |
1634 | } |
1635 | ||
fc75cc86 JH |
1636 | err = 0; |
1637 | ||
2b64d153 | 1638 | /* If it is our turn to send Pairing Confirm, do so now */ |
1cc61144 JH |
1639 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
1640 | u8 rsp = smp_confirm(smp); | |
1641 | if (rsp) | |
1642 | smp_failure(conn, rsp); | |
1643 | } | |
2b64d153 | 1644 | |
fc75cc86 JH |
1645 | unlock: |
1646 | l2cap_chan_unlock(chan); | |
1647 | return err; | |
2b64d153 BG |
1648 | } |
1649 | ||
b5ae344d JH |
1650 | static void build_bredr_pairing_cmd(struct smp_chan *smp, |
1651 | struct smp_cmd_pairing *req, | |
1652 | struct smp_cmd_pairing *rsp) | |
1653 | { | |
1654 | struct l2cap_conn *conn = smp->conn; | |
1655 | struct hci_dev *hdev = conn->hcon->hdev; | |
1656 | u8 local_dist = 0, remote_dist = 0; | |
1657 | ||
d7a5a11d | 1658 | if (hci_dev_test_flag(hdev, HCI_BONDABLE)) { |
b5ae344d JH |
1659 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
1660 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
1661 | } | |
1662 | ||
d7a5a11d | 1663 | if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING)) |
b5ae344d JH |
1664 | remote_dist |= SMP_DIST_ID_KEY; |
1665 | ||
d7a5a11d | 1666 | if (hci_dev_test_flag(hdev, HCI_PRIVACY)) |
b5ae344d JH |
1667 | local_dist |= SMP_DIST_ID_KEY; |
1668 | ||
1669 | if (!rsp) { | |
1670 | memset(req, 0, sizeof(*req)); | |
1671 | ||
1672 | req->init_key_dist = local_dist; | |
1673 | req->resp_key_dist = remote_dist; | |
e3f6a257 | 1674 | req->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1675 | |
1676 | smp->remote_key_dist = remote_dist; | |
1677 | ||
1678 | return; | |
1679 | } | |
1680 | ||
1681 | memset(rsp, 0, sizeof(*rsp)); | |
1682 | ||
e3f6a257 | 1683 | rsp->max_key_size = conn->hcon->enc_key_size; |
b5ae344d JH |
1684 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
1685 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
1686 | ||
1687 | smp->remote_key_dist = rsp->init_key_dist; | |
1688 | } | |
1689 | ||
da85e5e5 | 1690 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1691 | { |
3158c50c | 1692 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
fc75cc86 | 1693 | struct l2cap_chan *chan = conn->smp; |
b3c6410b | 1694 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 1695 | struct smp_chan *smp; |
c7262e71 | 1696 | u8 key_size, auth, sec_level; |
8aab4757 | 1697 | int ret; |
88ba43b6 AB |
1698 | |
1699 | BT_DBG("conn %p", conn); | |
1700 | ||
c46b98be | 1701 | if (skb->len < sizeof(*req)) |
38e4a915 | 1702 | return SMP_INVALID_PARAMS; |
c46b98be | 1703 | |
40bef302 | 1704 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
1705 | return SMP_CMD_NOTSUPP; |
1706 | ||
fc75cc86 | 1707 | if (!chan->data) |
8aab4757 | 1708 | smp = smp_chan_create(conn); |
fc75cc86 | 1709 | else |
5d88cc73 | 1710 | smp = chan->data; |
8aab4757 | 1711 | |
d08fd0e7 AE |
1712 | if (!smp) |
1713 | return SMP_UNSPECIFIED; | |
d26a2345 | 1714 | |
c05b9339 | 1715 | /* We didn't start the pairing, so match remote */ |
0edb14de | 1716 | auth = req->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1717 | |
d7a5a11d | 1718 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 1719 | (auth & SMP_AUTH_BONDING)) |
b3c6410b JH |
1720 | return SMP_PAIRING_NOTSUPP; |
1721 | ||
d7a5a11d | 1722 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1723 | return SMP_AUTH_REQUIREMENTS; |
1724 | ||
1c1def09 VCG |
1725 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
1726 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 1727 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 1728 | |
cb06d366 JH |
1729 | /* If the remote side's OOB flag is set it means it has |
1730 | * successfully received our local OOB data - therefore set the | |
1731 | * flag to indicate that local OOB is in use. | |
1732 | */ | |
58428563 JH |
1733 | if (req->oob_flag == SMP_OOB_PRESENT) |
1734 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1735 | ||
b5ae344d JH |
1736 | /* SMP over BR/EDR requires special treatment */ |
1737 | if (conn->hcon->type == ACL_LINK) { | |
1738 | /* We must have a BR/EDR SC link */ | |
08f63cc5 | 1739 | if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) && |
b7cb93e5 | 1740 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
1741 | return SMP_CROSS_TRANSP_NOT_ALLOWED; |
1742 | ||
1743 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1744 | ||
1745 | build_bredr_pairing_cmd(smp, req, &rsp); | |
1746 | ||
1747 | key_size = min(req->max_key_size, rsp.max_key_size); | |
1748 | if (check_enc_key_size(conn, key_size)) | |
1749 | return SMP_ENC_KEY_SIZE; | |
1750 | ||
1751 | /* Clear bits which are generated but not distributed */ | |
1752 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1753 | ||
1754 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; | |
1755 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
1756 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); | |
1757 | ||
1758 | smp_distribute_keys(smp); | |
1759 | return 0; | |
1760 | } | |
1761 | ||
5e3d3d9b JH |
1762 | build_pairing_cmd(conn, req, &rsp, auth); |
1763 | ||
1764 | if (rsp.auth_req & SMP_AUTH_SC) | |
1765 | set_bit(SMP_FLAG_SC, &smp->flags); | |
1766 | ||
5be5e275 | 1767 | if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
1768 | sec_level = BT_SECURITY_MEDIUM; |
1769 | else | |
1770 | sec_level = authreq_to_seclevel(auth); | |
1771 | ||
c7262e71 JH |
1772 | if (sec_level > conn->hcon->pending_sec_level) |
1773 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 1774 | |
49c922bb | 1775 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1776 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1777 | u8 method; | |
1778 | ||
1779 | method = get_auth_method(smp, conn->hcon->io_capability, | |
1780 | req->io_capability); | |
1781 | if (method == JUST_WORKS || method == JUST_CFM) | |
1782 | return SMP_AUTH_REQUIREMENTS; | |
1783 | } | |
1784 | ||
3158c50c VCG |
1785 | key_size = min(req->max_key_size, rsp.max_key_size); |
1786 | if (check_enc_key_size(conn, key_size)) | |
1787 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 1788 | |
e84a6b13 | 1789 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 1790 | |
1c1def09 VCG |
1791 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1792 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 1793 | |
3158c50c | 1794 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
3b19146d JH |
1795 | |
1796 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); | |
1797 | ||
19c5ce9c JH |
1798 | /* Strictly speaking we shouldn't allow Pairing Confirm for the |
1799 | * SC case, however some implementations incorrectly copy RFU auth | |
1800 | * req bits from our security request, which may create a false | |
1801 | * positive SC enablement. | |
1802 | */ | |
1803 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
1804 | ||
3b19146d JH |
1805 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1806 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1807 | /* Clear bits which are generated but not distributed */ | |
1808 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1809 | /* Wait for Public Key from Initiating Device */ | |
1810 | return 0; | |
3b19146d | 1811 | } |
da85e5e5 | 1812 | |
2b64d153 BG |
1813 | /* Request setup of TK */ |
1814 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
1815 | if (ret) | |
1816 | return SMP_UNSPECIFIED; | |
1817 | ||
da85e5e5 | 1818 | return 0; |
88ba43b6 AB |
1819 | } |
1820 | ||
3b19146d JH |
1821 | static u8 sc_send_public_key(struct smp_chan *smp) |
1822 | { | |
70157ef5 JH |
1823 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
1824 | ||
3b19146d JH |
1825 | BT_DBG(""); |
1826 | ||
1a8bab4f | 1827 | if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) { |
33d0c030 MH |
1828 | struct l2cap_chan *chan = hdev->smp_data; |
1829 | struct smp_dev *smp_dev; | |
1830 | ||
1831 | if (!chan || !chan->data) | |
1832 | return SMP_UNSPECIFIED; | |
1833 | ||
1834 | smp_dev = chan->data; | |
1835 | ||
1836 | memcpy(smp->local_pk, smp_dev->local_pk, 64); | |
1837 | memcpy(smp->local_sk, smp_dev->local_sk, 32); | |
fb334fee | 1838 | memcpy(smp->lr, smp_dev->local_rand, 16); |
33d0c030 MH |
1839 | |
1840 | if (smp_dev->debug_key) | |
1841 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1842 | ||
1843 | goto done; | |
1844 | } | |
1845 | ||
d7a5a11d | 1846 | if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) { |
70157ef5 JH |
1847 | BT_DBG("Using debug keys"); |
1848 | memcpy(smp->local_pk, debug_pk, 64); | |
1849 | memcpy(smp->local_sk, debug_sk, 32); | |
1850 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
1851 | } else { | |
1852 | while (true) { | |
1853 | /* Generate local key pair for Secure Connections */ | |
1854 | if (!ecc_make_key(smp->local_pk, smp->local_sk)) | |
1855 | return SMP_UNSPECIFIED; | |
6c0dcc50 | 1856 | |
70157ef5 JH |
1857 | /* This is unlikely, but we need to check that |
1858 | * we didn't accidentially generate a debug key. | |
1859 | */ | |
1860 | if (memcmp(smp->local_sk, debug_sk, 32)) | |
1861 | break; | |
1862 | } | |
6c0dcc50 | 1863 | } |
3b19146d | 1864 | |
33d0c030 | 1865 | done: |
c7a3d57d | 1866 | SMP_DBG("Local Public Key X: %32phN", smp->local_pk); |
8e4e2ee5 | 1867 | SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32); |
c7a3d57d | 1868 | SMP_DBG("Local Private Key: %32phN", smp->local_sk); |
3b19146d JH |
1869 | |
1870 | smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk); | |
1871 | ||
1872 | return 0; | |
1873 | } | |
1874 | ||
da85e5e5 | 1875 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 1876 | { |
3158c50c | 1877 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
5d88cc73 JH |
1878 | struct l2cap_chan *chan = conn->smp; |
1879 | struct smp_chan *smp = chan->data; | |
0edb14de | 1880 | struct hci_dev *hdev = conn->hcon->hdev; |
3a7dbfb8 | 1881 | u8 key_size, auth; |
7d24ddcc | 1882 | int ret; |
88ba43b6 AB |
1883 | |
1884 | BT_DBG("conn %p", conn); | |
1885 | ||
c46b98be | 1886 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 1887 | return SMP_INVALID_PARAMS; |
c46b98be | 1888 | |
40bef302 | 1889 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
1890 | return SMP_CMD_NOTSUPP; |
1891 | ||
3158c50c VCG |
1892 | skb_pull(skb, sizeof(*rsp)); |
1893 | ||
1c1def09 | 1894 | req = (void *) &smp->preq[1]; |
da85e5e5 | 1895 | |
3158c50c VCG |
1896 | key_size = min(req->max_key_size, rsp->max_key_size); |
1897 | if (check_enc_key_size(conn, key_size)) | |
1898 | return SMP_ENC_KEY_SIZE; | |
1899 | ||
0edb14de | 1900 | auth = rsp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 1901 | |
d7a5a11d | 1902 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
1903 | return SMP_AUTH_REQUIREMENTS; |
1904 | ||
cb06d366 JH |
1905 | /* If the remote side's OOB flag is set it means it has |
1906 | * successfully received our local OOB data - therefore set the | |
1907 | * flag to indicate that local OOB is in use. | |
1908 | */ | |
58428563 JH |
1909 | if (rsp->oob_flag == SMP_OOB_PRESENT) |
1910 | set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags); | |
1911 | ||
b5ae344d JH |
1912 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
1913 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
1914 | ||
1915 | /* Update remote key distribution in case the remote cleared | |
1916 | * some bits that we had enabled in our request. | |
1917 | */ | |
1918 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1919 | ||
1920 | /* For BR/EDR this means we're done and can start phase 3 */ | |
1921 | if (conn->hcon->type == ACL_LINK) { | |
1922 | /* Clear bits which are generated but not distributed */ | |
1923 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1924 | smp_distribute_keys(smp); | |
1925 | return 0; | |
1926 | } | |
1927 | ||
65668776 JH |
1928 | if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC)) |
1929 | set_bit(SMP_FLAG_SC, &smp->flags); | |
d2eb9e10 JH |
1930 | else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH) |
1931 | conn->hcon->pending_sec_level = BT_SECURITY_HIGH; | |
65668776 | 1932 | |
49c922bb | 1933 | /* If we need MITM check that it can be achieved */ |
2ed8f65c JH |
1934 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { |
1935 | u8 method; | |
1936 | ||
1937 | method = get_auth_method(smp, req->io_capability, | |
1938 | rsp->io_capability); | |
1939 | if (method == JUST_WORKS || method == JUST_CFM) | |
1940 | return SMP_AUTH_REQUIREMENTS; | |
1941 | } | |
1942 | ||
e84a6b13 | 1943 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 1944 | |
fdcc4bec JH |
1945 | /* Update remote key distribution in case the remote cleared |
1946 | * some bits that we had enabled in our request. | |
1947 | */ | |
1948 | smp->remote_key_dist &= rsp->resp_key_dist; | |
1949 | ||
3b19146d JH |
1950 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
1951 | /* Clear bits which are generated but not distributed */ | |
1952 | smp->remote_key_dist &= ~SMP_SC_NO_DIST; | |
1953 | SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY); | |
1954 | return sc_send_public_key(smp); | |
1955 | } | |
1956 | ||
c05b9339 | 1957 | auth |= req->auth_req; |
2b64d153 | 1958 | |
476585ec | 1959 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
1960 | if (ret) |
1961 | return SMP_UNSPECIFIED; | |
1962 | ||
4a74d658 | 1963 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
1964 | |
1965 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 1966 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 1967 | return smp_confirm(smp); |
da85e5e5 VCG |
1968 | |
1969 | return 0; | |
88ba43b6 AB |
1970 | } |
1971 | ||
dcee2b32 JH |
1972 | static u8 sc_check_confirm(struct smp_chan *smp) |
1973 | { | |
1974 | struct l2cap_conn *conn = smp->conn; | |
1975 | ||
1976 | BT_DBG(""); | |
1977 | ||
38606f14 JH |
1978 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
1979 | return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM); | |
1980 | ||
dcee2b32 JH |
1981 | if (conn->hcon->out) { |
1982 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
1983 | smp->prnd); | |
1984 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
1985 | } | |
1986 | ||
1987 | return 0; | |
1988 | } | |
1989 | ||
19c5ce9c JH |
1990 | /* Work-around for some implementations that incorrectly copy RFU bits |
1991 | * from our security request and thereby create the impression that | |
1992 | * we're doing SC when in fact the remote doesn't support it. | |
1993 | */ | |
1994 | static int fixup_sc_false_positive(struct smp_chan *smp) | |
1995 | { | |
1996 | struct l2cap_conn *conn = smp->conn; | |
1997 | struct hci_conn *hcon = conn->hcon; | |
1998 | struct hci_dev *hdev = hcon->hdev; | |
1999 | struct smp_cmd_pairing *req, *rsp; | |
2000 | u8 auth; | |
2001 | ||
2002 | /* The issue is only observed when we're in slave role */ | |
2003 | if (hcon->out) | |
2004 | return SMP_UNSPECIFIED; | |
2005 | ||
2006 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) { | |
2007 | BT_ERR("Refusing SMP SC -> legacy fallback in SC-only mode"); | |
2008 | return SMP_UNSPECIFIED; | |
2009 | } | |
2010 | ||
2011 | BT_ERR("Trying to fall back to legacy SMP"); | |
2012 | ||
2013 | req = (void *) &smp->preq[1]; | |
2014 | rsp = (void *) &smp->prsp[1]; | |
2015 | ||
2016 | /* Rebuild key dist flags which may have been cleared for SC */ | |
2017 | smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist); | |
2018 | ||
2019 | auth = req->auth_req & AUTH_REQ_MASK(hdev); | |
2020 | ||
2021 | if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) { | |
2022 | BT_ERR("Failed to fall back to legacy SMP"); | |
2023 | return SMP_UNSPECIFIED; | |
2024 | } | |
2025 | ||
2026 | clear_bit(SMP_FLAG_SC, &smp->flags); | |
2027 | ||
2028 | return 0; | |
2029 | } | |
2030 | ||
da85e5e5 | 2031 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2032 | { |
5d88cc73 JH |
2033 | struct l2cap_chan *chan = conn->smp; |
2034 | struct smp_chan *smp = chan->data; | |
7d24ddcc | 2035 | |
88ba43b6 AB |
2036 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
2037 | ||
c46b98be | 2038 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 2039 | return SMP_INVALID_PARAMS; |
c46b98be | 2040 | |
1c1def09 VCG |
2041 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
2042 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 2043 | |
19c5ce9c JH |
2044 | if (test_bit(SMP_FLAG_SC, &smp->flags)) { |
2045 | int ret; | |
2046 | ||
2047 | /* Public Key exchange must happen before any other steps */ | |
2048 | if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags)) | |
2049 | return sc_check_confirm(smp); | |
2050 | ||
2051 | BT_ERR("Unexpected SMP Pairing Confirm"); | |
2052 | ||
2053 | ret = fixup_sc_false_positive(smp); | |
2054 | if (ret) | |
2055 | return ret; | |
2056 | } | |
dcee2b32 | 2057 | |
b28b4943 | 2058 | if (conn->hcon->out) { |
943a732a JH |
2059 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
2060 | smp->prnd); | |
b28b4943 JH |
2061 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); |
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) | |
1cc61144 | 2066 | return smp_confirm(smp); |
983f9814 MH |
2067 | |
2068 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); | |
da85e5e5 VCG |
2069 | |
2070 | return 0; | |
88ba43b6 AB |
2071 | } |
2072 | ||
da85e5e5 | 2073 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 2074 | { |
5d88cc73 JH |
2075 | struct l2cap_chan *chan = conn->smp; |
2076 | struct smp_chan *smp = chan->data; | |
191dc7fe JH |
2077 | struct hci_conn *hcon = conn->hcon; |
2078 | u8 *pkax, *pkbx, *na, *nb; | |
2079 | u32 passkey; | |
2080 | int err; | |
7d24ddcc | 2081 | |
8aab4757 | 2082 | BT_DBG("conn %p", conn); |
3158c50c | 2083 | |
c46b98be | 2084 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 2085 | return SMP_INVALID_PARAMS; |
c46b98be | 2086 | |
943a732a | 2087 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 2088 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 2089 | |
191dc7fe JH |
2090 | if (!test_bit(SMP_FLAG_SC, &smp->flags)) |
2091 | return smp_random(smp); | |
2092 | ||
580039e8 JH |
2093 | if (hcon->out) { |
2094 | pkax = smp->local_pk; | |
2095 | pkbx = smp->remote_pk; | |
2096 | na = smp->prnd; | |
2097 | nb = smp->rrnd; | |
2098 | } else { | |
2099 | pkax = smp->remote_pk; | |
2100 | pkbx = smp->local_pk; | |
2101 | na = smp->rrnd; | |
2102 | nb = smp->prnd; | |
2103 | } | |
2104 | ||
a29b0733 JH |
2105 | if (smp->method == REQ_OOB) { |
2106 | if (!hcon->out) | |
2107 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2108 | sizeof(smp->prnd), smp->prnd); | |
2109 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
2110 | goto mackey_and_ltk; | |
2111 | } | |
2112 | ||
38606f14 JH |
2113 | /* Passkey entry has special treatment */ |
2114 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) | |
2115 | return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM); | |
2116 | ||
191dc7fe JH |
2117 | if (hcon->out) { |
2118 | u8 cfm[16]; | |
2119 | ||
2120 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk, | |
2121 | smp->rrnd, 0, cfm); | |
2122 | if (err) | |
2123 | return SMP_UNSPECIFIED; | |
2124 | ||
2125 | if (memcmp(smp->pcnf, cfm, 16)) | |
2126 | return SMP_CONFIRM_FAILED; | |
191dc7fe JH |
2127 | } else { |
2128 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
2129 | smp->prnd); | |
2130 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); | |
191dc7fe JH |
2131 | } |
2132 | ||
a29b0733 | 2133 | mackey_and_ltk: |
760b018b JH |
2134 | /* Generate MacKey and LTK */ |
2135 | err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk); | |
2136 | if (err) | |
2137 | return SMP_UNSPECIFIED; | |
2138 | ||
a29b0733 | 2139 | if (smp->method == JUST_WORKS || smp->method == REQ_OOB) { |
dddd3059 | 2140 | if (hcon->out) { |
38606f14 | 2141 | sc_dhkey_check(smp); |
dddd3059 JH |
2142 | SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK); |
2143 | } | |
2144 | return 0; | |
2145 | } | |
2146 | ||
38606f14 JH |
2147 | err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey); |
2148 | if (err) | |
2149 | return SMP_UNSPECIFIED; | |
2150 | ||
2151 | err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type, | |
2152 | hcon->dst_type, passkey, 0); | |
191dc7fe JH |
2153 | if (err) |
2154 | return SMP_UNSPECIFIED; | |
2155 | ||
38606f14 JH |
2156 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); |
2157 | ||
191dc7fe | 2158 | return 0; |
88ba43b6 AB |
2159 | } |
2160 | ||
f81cd823 | 2161 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 2162 | { |
c9839a11 | 2163 | struct smp_ltk *key; |
988c5997 VCG |
2164 | struct hci_conn *hcon = conn->hcon; |
2165 | ||
f3a73d97 | 2166 | key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role); |
988c5997 | 2167 | if (!key) |
f81cd823 | 2168 | return false; |
988c5997 | 2169 | |
a6f7833c | 2170 | if (smp_ltk_sec_level(key) < sec_level) |
f81cd823 | 2171 | return false; |
4dab7864 | 2172 | |
51a8efd7 | 2173 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 2174 | return true; |
988c5997 | 2175 | |
8b76ce34 | 2176 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size); |
c9839a11 | 2177 | hcon->enc_key_size = key->enc_size; |
988c5997 | 2178 | |
fe59a05f JH |
2179 | /* We never store STKs for master role, so clear this flag */ |
2180 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
2181 | ||
f81cd823 | 2182 | return true; |
988c5997 | 2183 | } |
f1560463 | 2184 | |
35dc6f83 JH |
2185 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level, |
2186 | enum smp_key_pref key_pref) | |
854f4727 JH |
2187 | { |
2188 | if (sec_level == BT_SECURITY_LOW) | |
2189 | return true; | |
2190 | ||
35dc6f83 JH |
2191 | /* If we're encrypted with an STK but the caller prefers using |
2192 | * LTK claim insufficient security. This way we allow the | |
2193 | * connection to be re-encrypted with an LTK, even if the LTK | |
2194 | * provides the same level of security. Only exception is if we | |
2195 | * don't have an LTK (e.g. because of key distribution bits). | |
9ab65d60 | 2196 | */ |
35dc6f83 JH |
2197 | if (key_pref == SMP_USE_LTK && |
2198 | test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && | |
f3a73d97 | 2199 | hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role)) |
9ab65d60 JH |
2200 | return false; |
2201 | ||
854f4727 JH |
2202 | if (hcon->sec_level >= sec_level) |
2203 | return true; | |
2204 | ||
2205 | return false; | |
2206 | } | |
2207 | ||
da85e5e5 | 2208 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
2209 | { |
2210 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
2211 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 2212 | struct hci_conn *hcon = conn->hcon; |
0edb14de | 2213 | struct hci_dev *hdev = hcon->hdev; |
8aab4757 | 2214 | struct smp_chan *smp; |
c05b9339 | 2215 | u8 sec_level, auth; |
88ba43b6 AB |
2216 | |
2217 | BT_DBG("conn %p", conn); | |
2218 | ||
c46b98be | 2219 | if (skb->len < sizeof(*rp)) |
38e4a915 | 2220 | return SMP_INVALID_PARAMS; |
c46b98be | 2221 | |
40bef302 | 2222 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
2223 | return SMP_CMD_NOTSUPP; |
2224 | ||
0edb14de | 2225 | auth = rp->auth_req & AUTH_REQ_MASK(hdev); |
c05b9339 | 2226 | |
d7a5a11d | 2227 | if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC)) |
903b71c7 JH |
2228 | return SMP_AUTH_REQUIREMENTS; |
2229 | ||
5be5e275 | 2230 | if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) |
1afc2a1a JH |
2231 | sec_level = BT_SECURITY_MEDIUM; |
2232 | else | |
2233 | sec_level = authreq_to_seclevel(auth); | |
2234 | ||
35dc6f83 | 2235 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
854f4727 JH |
2236 | return 0; |
2237 | ||
c7262e71 JH |
2238 | if (sec_level > hcon->pending_sec_level) |
2239 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 2240 | |
4dab7864 | 2241 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
2242 | return 0; |
2243 | ||
8aab4757 | 2244 | smp = smp_chan_create(conn); |
c29d2444 JH |
2245 | if (!smp) |
2246 | return SMP_UNSPECIFIED; | |
d26a2345 | 2247 | |
d7a5a11d | 2248 | if (!hci_dev_test_flag(hdev, HCI_BONDABLE) && |
c05b9339 | 2249 | (auth & SMP_AUTH_BONDING)) |
616d55be JH |
2250 | return SMP_PAIRING_NOTSUPP; |
2251 | ||
88ba43b6 | 2252 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 2253 | |
da85e5e5 | 2254 | memset(&cp, 0, sizeof(cp)); |
c05b9339 | 2255 | build_pairing_cmd(conn, &cp, NULL, auth); |
88ba43b6 | 2256 | |
1c1def09 VCG |
2257 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2258 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2259 | |
88ba43b6 | 2260 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2261 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
f1cb9af5 | 2262 | |
da85e5e5 | 2263 | return 0; |
88ba43b6 AB |
2264 | } |
2265 | ||
cc110922 | 2266 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 2267 | { |
cc110922 | 2268 | struct l2cap_conn *conn = hcon->l2cap_data; |
c68b7f12 | 2269 | struct l2cap_chan *chan; |
0a66cf20 | 2270 | struct smp_chan *smp; |
2b64d153 | 2271 | __u8 authreq; |
fc75cc86 | 2272 | int ret; |
eb492e01 | 2273 | |
3a0259bb VCG |
2274 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
2275 | ||
0a66cf20 JH |
2276 | /* This may be NULL if there's an unexpected disconnection */ |
2277 | if (!conn) | |
2278 | return 1; | |
2279 | ||
d7a5a11d | 2280 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) |
2e65c9d2 AG |
2281 | return 1; |
2282 | ||
35dc6f83 | 2283 | if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) |
eb492e01 | 2284 | return 1; |
f1cb9af5 | 2285 | |
c7262e71 JH |
2286 | if (sec_level > hcon->pending_sec_level) |
2287 | hcon->pending_sec_level = sec_level; | |
2288 | ||
40bef302 | 2289 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
2290 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
2291 | return 0; | |
d26a2345 | 2292 | |
d8949aad JH |
2293 | chan = conn->smp; |
2294 | if (!chan) { | |
2295 | BT_ERR("SMP security requested but not available"); | |
2296 | return 1; | |
2297 | } | |
2298 | ||
fc75cc86 JH |
2299 | l2cap_chan_lock(chan); |
2300 | ||
2301 | /* If SMP is already in progress ignore this request */ | |
2302 | if (chan->data) { | |
2303 | ret = 0; | |
2304 | goto unlock; | |
2305 | } | |
d26a2345 | 2306 | |
8aab4757 | 2307 | smp = smp_chan_create(conn); |
fc75cc86 JH |
2308 | if (!smp) { |
2309 | ret = 1; | |
2310 | goto unlock; | |
2311 | } | |
2b64d153 BG |
2312 | |
2313 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 2314 | |
d7a5a11d | 2315 | if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) |
d2eb9e10 JH |
2316 | authreq |= SMP_AUTH_SC; |
2317 | ||
79897d20 JH |
2318 | /* Require MITM if IO Capability allows or the security level |
2319 | * requires it. | |
2e233644 | 2320 | */ |
79897d20 | 2321 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 2322 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
2323 | authreq |= SMP_AUTH_MITM; |
2324 | ||
40bef302 | 2325 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 2326 | struct smp_cmd_pairing cp; |
f01ead31 | 2327 | |
2b64d153 | 2328 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
2329 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
2330 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 2331 | |
eb492e01 | 2332 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
b28b4943 | 2333 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); |
eb492e01 AB |
2334 | } else { |
2335 | struct smp_cmd_security_req cp; | |
2b64d153 | 2336 | cp.auth_req = authreq; |
eb492e01 | 2337 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
b28b4943 | 2338 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ); |
eb492e01 AB |
2339 | } |
2340 | ||
4a74d658 | 2341 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
fc75cc86 | 2342 | ret = 0; |
edca792c | 2343 | |
fc75cc86 JH |
2344 | unlock: |
2345 | l2cap_chan_unlock(chan); | |
2346 | return ret; | |
eb492e01 AB |
2347 | } |
2348 | ||
c81d555a JH |
2349 | void smp_cancel_pairing(struct hci_conn *hcon) |
2350 | { | |
2351 | struct l2cap_conn *conn = hcon->l2cap_data; | |
2352 | struct l2cap_chan *chan; | |
2353 | struct smp_chan *smp; | |
2354 | ||
2355 | if (!conn) | |
2356 | return; | |
2357 | ||
2358 | chan = conn->smp; | |
2359 | if (!chan) | |
2360 | return; | |
2361 | ||
2362 | l2cap_chan_lock(chan); | |
2363 | ||
2364 | smp = chan->data; | |
2365 | if (smp) { | |
2366 | if (test_bit(SMP_FLAG_COMPLETE, &smp->flags)) | |
2367 | smp_failure(conn, 0); | |
2368 | else | |
2369 | smp_failure(conn, SMP_UNSPECIFIED); | |
2370 | } | |
2371 | ||
2372 | l2cap_chan_unlock(chan); | |
2373 | } | |
2374 | ||
7034b911 VCG |
2375 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2376 | { | |
16b90839 | 2377 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
5d88cc73 JH |
2378 | struct l2cap_chan *chan = conn->smp; |
2379 | struct smp_chan *smp = chan->data; | |
16b90839 | 2380 | |
c46b98be JH |
2381 | BT_DBG("conn %p", conn); |
2382 | ||
2383 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2384 | return SMP_INVALID_PARAMS; |
c46b98be | 2385 | |
b28b4943 | 2386 | SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT); |
6131ddc8 | 2387 | |
16b90839 VCG |
2388 | skb_pull(skb, sizeof(*rp)); |
2389 | ||
1c1def09 | 2390 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 2391 | |
7034b911 VCG |
2392 | return 0; |
2393 | } | |
2394 | ||
2395 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
2396 | { | |
16b90839 | 2397 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
5d88cc73 JH |
2398 | struct l2cap_chan *chan = conn->smp; |
2399 | struct smp_chan *smp = chan->data; | |
c9839a11 VCG |
2400 | struct hci_dev *hdev = conn->hcon->hdev; |
2401 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 2402 | struct smp_ltk *ltk; |
c9839a11 | 2403 | u8 authenticated; |
16b90839 | 2404 | |
c46b98be JH |
2405 | BT_DBG("conn %p", conn); |
2406 | ||
2407 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2408 | return SMP_INVALID_PARAMS; |
c46b98be | 2409 | |
9747a9f3 JH |
2410 | /* Mark the information as received */ |
2411 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
2412 | ||
b28b4943 JH |
2413 | if (smp->remote_key_dist & SMP_DIST_ID_KEY) |
2414 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO); | |
196332f5 JH |
2415 | else if (smp->remote_key_dist & SMP_DIST_SIGN) |
2416 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
b28b4943 | 2417 | |
16b90839 | 2418 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 2419 | |
ce39fb4e | 2420 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 2421 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
2422 | authenticated, smp->tk, smp->enc_key_size, |
2423 | rp->ediv, rp->rand); | |
2424 | smp->ltk = ltk; | |
c6e81e9a | 2425 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
d6268e86 | 2426 | smp_distribute_keys(smp); |
7034b911 VCG |
2427 | |
2428 | return 0; | |
2429 | } | |
2430 | ||
fd349c02 JH |
2431 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2432 | { | |
2433 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
5d88cc73 JH |
2434 | struct l2cap_chan *chan = conn->smp; |
2435 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2436 | |
2437 | BT_DBG(""); | |
2438 | ||
2439 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2440 | return SMP_INVALID_PARAMS; |
fd349c02 | 2441 | |
b28b4943 | 2442 | SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO); |
6131ddc8 | 2443 | |
fd349c02 JH |
2444 | skb_pull(skb, sizeof(*info)); |
2445 | ||
2446 | memcpy(smp->irk, info->irk, 16); | |
2447 | ||
2448 | return 0; | |
2449 | } | |
2450 | ||
2451 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
2452 | struct sk_buff *skb) | |
2453 | { | |
2454 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
5d88cc73 JH |
2455 | struct l2cap_chan *chan = conn->smp; |
2456 | struct smp_chan *smp = chan->data; | |
fd349c02 JH |
2457 | struct hci_conn *hcon = conn->hcon; |
2458 | bdaddr_t rpa; | |
2459 | ||
2460 | BT_DBG(""); | |
2461 | ||
2462 | if (skb->len < sizeof(*info)) | |
38e4a915 | 2463 | return SMP_INVALID_PARAMS; |
fd349c02 | 2464 | |
9747a9f3 JH |
2465 | /* Mark the information as received */ |
2466 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
2467 | ||
b28b4943 JH |
2468 | if (smp->remote_key_dist & SMP_DIST_SIGN) |
2469 | SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO); | |
2470 | ||
fd349c02 JH |
2471 | skb_pull(skb, sizeof(*info)); |
2472 | ||
a9a58f86 JH |
2473 | /* Strictly speaking the Core Specification (4.1) allows sending |
2474 | * an empty address which would force us to rely on just the IRK | |
2475 | * as "identity information". However, since such | |
2476 | * implementations are not known of and in order to not over | |
2477 | * complicate our implementation, simply pretend that we never | |
2478 | * received an IRK for such a device. | |
e12af489 JH |
2479 | * |
2480 | * The Identity Address must also be a Static Random or Public | |
2481 | * Address, which hci_is_identity_address() checks for. | |
a9a58f86 | 2482 | */ |
e12af489 JH |
2483 | if (!bacmp(&info->bdaddr, BDADDR_ANY) || |
2484 | !hci_is_identity_address(&info->bdaddr, info->addr_type)) { | |
a9a58f86 | 2485 | BT_ERR("Ignoring IRK with no identity address"); |
31dd624e | 2486 | goto distribute; |
a9a58f86 JH |
2487 | } |
2488 | ||
fd349c02 JH |
2489 | bacpy(&smp->id_addr, &info->bdaddr); |
2490 | smp->id_addr_type = info->addr_type; | |
2491 | ||
2492 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
2493 | bacpy(&rpa, &hcon->dst); | |
2494 | else | |
2495 | bacpy(&rpa, BDADDR_ANY); | |
2496 | ||
23d0e128 JH |
2497 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
2498 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 2499 | |
31dd624e | 2500 | distribute: |
c6e81e9a JH |
2501 | if (!(smp->remote_key_dist & KEY_DIST_MASK)) |
2502 | smp_distribute_keys(smp); | |
fd349c02 JH |
2503 | |
2504 | return 0; | |
2505 | } | |
2506 | ||
7ee4ea36 MH |
2507 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
2508 | { | |
2509 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
5d88cc73 JH |
2510 | struct l2cap_chan *chan = conn->smp; |
2511 | struct smp_chan *smp = chan->data; | |
7ee4ea36 MH |
2512 | struct smp_csrk *csrk; |
2513 | ||
2514 | BT_DBG("conn %p", conn); | |
2515 | ||
2516 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 2517 | return SMP_INVALID_PARAMS; |
7ee4ea36 | 2518 | |
7ee4ea36 MH |
2519 | /* Mark the information as received */ |
2520 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
2521 | ||
2522 | skb_pull(skb, sizeof(*rp)); | |
2523 | ||
7ee4ea36 MH |
2524 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
2525 | if (csrk) { | |
4cd3928a JH |
2526 | if (conn->hcon->sec_level > BT_SECURITY_MEDIUM) |
2527 | csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED; | |
2528 | else | |
2529 | csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED; | |
7ee4ea36 MH |
2530 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); |
2531 | } | |
2532 | smp->csrk = csrk; | |
d6268e86 | 2533 | smp_distribute_keys(smp); |
7ee4ea36 MH |
2534 | |
2535 | return 0; | |
2536 | } | |
2537 | ||
5e3d3d9b JH |
2538 | static u8 sc_select_method(struct smp_chan *smp) |
2539 | { | |
2540 | struct l2cap_conn *conn = smp->conn; | |
2541 | struct hci_conn *hcon = conn->hcon; | |
2542 | struct smp_cmd_pairing *local, *remote; | |
2543 | u8 local_mitm, remote_mitm, local_io, remote_io, method; | |
2544 | ||
1a8bab4f JH |
2545 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) || |
2546 | test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) | |
a29b0733 JH |
2547 | return REQ_OOB; |
2548 | ||
5e3d3d9b JH |
2549 | /* The preq/prsp contain the raw Pairing Request/Response PDUs |
2550 | * which are needed as inputs to some crypto functions. To get | |
2551 | * the "struct smp_cmd_pairing" from them we need to skip the | |
2552 | * first byte which contains the opcode. | |
2553 | */ | |
2554 | if (hcon->out) { | |
2555 | local = (void *) &smp->preq[1]; | |
2556 | remote = (void *) &smp->prsp[1]; | |
2557 | } else { | |
2558 | local = (void *) &smp->prsp[1]; | |
2559 | remote = (void *) &smp->preq[1]; | |
2560 | } | |
2561 | ||
2562 | local_io = local->io_capability; | |
2563 | remote_io = remote->io_capability; | |
2564 | ||
2565 | local_mitm = (local->auth_req & SMP_AUTH_MITM); | |
2566 | remote_mitm = (remote->auth_req & SMP_AUTH_MITM); | |
2567 | ||
2568 | /* If either side wants MITM, look up the method from the table, | |
2569 | * otherwise use JUST WORKS. | |
2570 | */ | |
2571 | if (local_mitm || remote_mitm) | |
2572 | method = get_auth_method(smp, local_io, remote_io); | |
2573 | else | |
2574 | method = JUST_WORKS; | |
2575 | ||
2576 | /* Don't confirm locally initiated pairing attempts */ | |
2577 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) | |
2578 | method = JUST_WORKS; | |
2579 | ||
2580 | return method; | |
2581 | } | |
2582 | ||
d8f8edbe JH |
2583 | static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb) |
2584 | { | |
2585 | struct smp_cmd_public_key *key = (void *) skb->data; | |
2586 | struct hci_conn *hcon = conn->hcon; | |
2587 | struct l2cap_chan *chan = conn->smp; | |
2588 | struct smp_chan *smp = chan->data; | |
5e3d3d9b | 2589 | struct hci_dev *hdev = hcon->hdev; |
cbbbe3e2 | 2590 | struct smp_cmd_pairing_confirm cfm; |
d8f8edbe JH |
2591 | int err; |
2592 | ||
2593 | BT_DBG("conn %p", conn); | |
2594 | ||
2595 | if (skb->len < sizeof(*key)) | |
2596 | return SMP_INVALID_PARAMS; | |
2597 | ||
2598 | memcpy(smp->remote_pk, key, 64); | |
2599 | ||
a8ca617c JH |
2600 | if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) { |
2601 | err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk, | |
2602 | smp->rr, 0, cfm.confirm_val); | |
2603 | if (err) | |
2604 | return SMP_UNSPECIFIED; | |
2605 | ||
2606 | if (memcmp(cfm.confirm_val, smp->pcnf, 16)) | |
2607 | return SMP_CONFIRM_FAILED; | |
2608 | } | |
2609 | ||
d8f8edbe JH |
2610 | /* Non-initiating device sends its public key after receiving |
2611 | * the key from the initiating device. | |
2612 | */ | |
2613 | if (!hcon->out) { | |
2614 | err = sc_send_public_key(smp); | |
2615 | if (err) | |
2616 | return err; | |
2617 | } | |
2618 | ||
c7a3d57d | 2619 | SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk); |
e091526d | 2620 | SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32); |
d8f8edbe JH |
2621 | |
2622 | if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey)) | |
2623 | return SMP_UNSPECIFIED; | |
2624 | ||
c7a3d57d | 2625 | SMP_DBG("DHKey %32phN", smp->dhkey); |
d8f8edbe JH |
2626 | |
2627 | set_bit(SMP_FLAG_REMOTE_PK, &smp->flags); | |
2628 | ||
5e3d3d9b JH |
2629 | smp->method = sc_select_method(smp); |
2630 | ||
2631 | BT_DBG("%s selected method 0x%02x", hdev->name, smp->method); | |
2632 | ||
2633 | /* JUST_WORKS and JUST_CFM result in an unauthenticated key */ | |
2634 | if (smp->method == JUST_WORKS || smp->method == JUST_CFM) | |
2635 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; | |
2636 | else | |
2637 | hcon->pending_sec_level = BT_SECURITY_FIPS; | |
2638 | ||
aeb7d461 JH |
2639 | if (!memcmp(debug_pk, smp->remote_pk, 64)) |
2640 | set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags); | |
2641 | ||
38606f14 JH |
2642 | if (smp->method == DSP_PASSKEY) { |
2643 | get_random_bytes(&hcon->passkey_notify, | |
2644 | sizeof(hcon->passkey_notify)); | |
2645 | hcon->passkey_notify %= 1000000; | |
2646 | hcon->passkey_entered = 0; | |
2647 | smp->passkey_round = 0; | |
2648 | if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type, | |
2649 | hcon->dst_type, | |
2650 | hcon->passkey_notify, | |
2651 | hcon->passkey_entered)) | |
2652 | return SMP_UNSPECIFIED; | |
2653 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2654 | return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY); | |
2655 | } | |
2656 | ||
94ea7257 | 2657 | if (smp->method == REQ_OOB) { |
a29b0733 JH |
2658 | if (hcon->out) |
2659 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, | |
2660 | sizeof(smp->prnd), smp->prnd); | |
2661 | ||
2662 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2663 | ||
2664 | return 0; | |
2665 | } | |
2666 | ||
38606f14 JH |
2667 | if (hcon->out) |
2668 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2669 | ||
2670 | if (smp->method == REQ_PASSKEY) { | |
2671 | if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type, | |
2672 | hcon->dst_type)) | |
2673 | return SMP_UNSPECIFIED; | |
2674 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM); | |
2675 | set_bit(SMP_FLAG_WAIT_USER, &smp->flags); | |
2676 | return 0; | |
2677 | } | |
2678 | ||
cbbbe3e2 JH |
2679 | /* The Initiating device waits for the non-initiating device to |
2680 | * send the confirm value. | |
2681 | */ | |
2682 | if (conn->hcon->out) | |
2683 | return 0; | |
2684 | ||
2685 | err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, | |
2686 | 0, cfm.confirm_val); | |
2687 | if (err) | |
2688 | return SMP_UNSPECIFIED; | |
2689 | ||
2690 | smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm); | |
2691 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM); | |
2692 | ||
d8f8edbe JH |
2693 | return 0; |
2694 | } | |
2695 | ||
6433a9a2 JH |
2696 | static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb) |
2697 | { | |
2698 | struct smp_cmd_dhkey_check *check = (void *) skb->data; | |
2699 | struct l2cap_chan *chan = conn->smp; | |
2700 | struct hci_conn *hcon = conn->hcon; | |
2701 | struct smp_chan *smp = chan->data; | |
2702 | u8 a[7], b[7], *local_addr, *remote_addr; | |
2703 | u8 io_cap[3], r[16], e[16]; | |
2704 | int err; | |
2705 | ||
2706 | BT_DBG("conn %p", conn); | |
2707 | ||
2708 | if (skb->len < sizeof(*check)) | |
2709 | return SMP_INVALID_PARAMS; | |
2710 | ||
2711 | memcpy(a, &hcon->init_addr, 6); | |
2712 | memcpy(b, &hcon->resp_addr, 6); | |
2713 | a[6] = hcon->init_addr_type; | |
2714 | b[6] = hcon->resp_addr_type; | |
2715 | ||
2716 | if (hcon->out) { | |
2717 | local_addr = a; | |
2718 | remote_addr = b; | |
2719 | memcpy(io_cap, &smp->prsp[1], 3); | |
2720 | } else { | |
2721 | local_addr = b; | |
2722 | remote_addr = a; | |
2723 | memcpy(io_cap, &smp->preq[1], 3); | |
2724 | } | |
2725 | ||
2726 | memset(r, 0, sizeof(r)); | |
2727 | ||
38606f14 JH |
2728 | if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY) |
2729 | put_unaligned_le32(hcon->passkey_notify, r); | |
882fafad JH |
2730 | else if (smp->method == REQ_OOB) |
2731 | memcpy(r, smp->lr, 16); | |
38606f14 | 2732 | |
6433a9a2 JH |
2733 | err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r, |
2734 | io_cap, remote_addr, local_addr, e); | |
2735 | if (err) | |
2736 | return SMP_UNSPECIFIED; | |
2737 | ||
2738 | if (memcmp(check->e, e, 16)) | |
2739 | return SMP_DHKEY_CHECK_FAILED; | |
2740 | ||
d3e54a87 JH |
2741 | if (!hcon->out) { |
2742 | if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) { | |
2743 | set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags); | |
2744 | return 0; | |
2745 | } | |
d378a2d7 | 2746 | |
d3e54a87 JH |
2747 | /* Slave sends DHKey check as response to master */ |
2748 | sc_dhkey_check(smp); | |
2749 | } | |
d378a2d7 | 2750 | |
d3e54a87 | 2751 | sc_add_ltk(smp); |
6433a9a2 JH |
2752 | |
2753 | if (hcon->out) { | |
8b76ce34 | 2754 | hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size); |
6433a9a2 JH |
2755 | hcon->enc_key_size = smp->enc_key_size; |
2756 | } | |
2757 | ||
2758 | return 0; | |
2759 | } | |
2760 | ||
1408bb6e JH |
2761 | static int smp_cmd_keypress_notify(struct l2cap_conn *conn, |
2762 | struct sk_buff *skb) | |
2763 | { | |
2764 | struct smp_cmd_keypress_notify *kp = (void *) skb->data; | |
2765 | ||
2766 | BT_DBG("value 0x%02x", kp->value); | |
2767 | ||
2768 | return 0; | |
2769 | } | |
2770 | ||
4befb867 | 2771 | static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb) |
eb492e01 | 2772 | { |
5d88cc73 | 2773 | struct l2cap_conn *conn = chan->conn; |
7b9899db | 2774 | struct hci_conn *hcon = conn->hcon; |
b28b4943 | 2775 | struct smp_chan *smp; |
92381f5c | 2776 | __u8 code, reason; |
eb492e01 AB |
2777 | int err = 0; |
2778 | ||
8ae9b984 | 2779 | if (skb->len < 1) |
92381f5c | 2780 | return -EILSEQ; |
92381f5c | 2781 | |
d7a5a11d | 2782 | if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) { |
2e65c9d2 AG |
2783 | reason = SMP_PAIRING_NOTSUPP; |
2784 | goto done; | |
2785 | } | |
2786 | ||
92381f5c | 2787 | code = skb->data[0]; |
eb492e01 AB |
2788 | skb_pull(skb, sizeof(code)); |
2789 | ||
b28b4943 JH |
2790 | smp = chan->data; |
2791 | ||
2792 | if (code > SMP_CMD_MAX) | |
2793 | goto drop; | |
2794 | ||
24bd0bd9 | 2795 | if (smp && !test_and_clear_bit(code, &smp->allow_cmd)) |
b28b4943 JH |
2796 | goto drop; |
2797 | ||
2798 | /* If we don't have a context the only allowed commands are | |
2799 | * pairing request and security request. | |
8cf9fa12 | 2800 | */ |
b28b4943 JH |
2801 | if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ) |
2802 | goto drop; | |
8cf9fa12 | 2803 | |
eb492e01 AB |
2804 | switch (code) { |
2805 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 2806 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
2807 | break; |
2808 | ||
2809 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 2810 | smp_failure(conn, 0); |
da85e5e5 | 2811 | err = -EPERM; |
eb492e01 AB |
2812 | break; |
2813 | ||
2814 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 2815 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
2816 | break; |
2817 | ||
2818 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 2819 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
2820 | break; |
2821 | ||
eb492e01 | 2822 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 2823 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
2824 | break; |
2825 | ||
eb492e01 | 2826 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 2827 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
2828 | break; |
2829 | ||
eb492e01 | 2830 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
2831 | reason = smp_cmd_encrypt_info(conn, skb); |
2832 | break; | |
2833 | ||
eb492e01 | 2834 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
2835 | reason = smp_cmd_master_ident(conn, skb); |
2836 | break; | |
2837 | ||
eb492e01 | 2838 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
2839 | reason = smp_cmd_ident_info(conn, skb); |
2840 | break; | |
2841 | ||
eb492e01 | 2842 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
2843 | reason = smp_cmd_ident_addr_info(conn, skb); |
2844 | break; | |
2845 | ||
eb492e01 | 2846 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 2847 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
2848 | break; |
2849 | ||
d8f8edbe JH |
2850 | case SMP_CMD_PUBLIC_KEY: |
2851 | reason = smp_cmd_public_key(conn, skb); | |
2852 | break; | |
2853 | ||
6433a9a2 JH |
2854 | case SMP_CMD_DHKEY_CHECK: |
2855 | reason = smp_cmd_dhkey_check(conn, skb); | |
2856 | break; | |
2857 | ||
1408bb6e JH |
2858 | case SMP_CMD_KEYPRESS_NOTIFY: |
2859 | reason = smp_cmd_keypress_notify(conn, skb); | |
2860 | break; | |
2861 | ||
eb492e01 AB |
2862 | default: |
2863 | BT_DBG("Unknown command code 0x%2.2x", code); | |
eb492e01 | 2864 | reason = SMP_CMD_NOTSUPP; |
3a0259bb | 2865 | goto done; |
eb492e01 AB |
2866 | } |
2867 | ||
3a0259bb | 2868 | done: |
9b7b18ef JH |
2869 | if (!err) { |
2870 | if (reason) | |
2871 | smp_failure(conn, reason); | |
8ae9b984 | 2872 | kfree_skb(skb); |
9b7b18ef JH |
2873 | } |
2874 | ||
eb492e01 | 2875 | return err; |
b28b4943 JH |
2876 | |
2877 | drop: | |
2878 | BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name, | |
2879 | code, &hcon->dst); | |
2880 | kfree_skb(skb); | |
2881 | return 0; | |
eb492e01 | 2882 | } |
7034b911 | 2883 | |
70db83c4 JH |
2884 | static void smp_teardown_cb(struct l2cap_chan *chan, int err) |
2885 | { | |
2886 | struct l2cap_conn *conn = chan->conn; | |
2887 | ||
2888 | BT_DBG("chan %p", chan); | |
2889 | ||
fc75cc86 | 2890 | if (chan->data) |
5d88cc73 | 2891 | smp_chan_destroy(conn); |
5d88cc73 | 2892 | |
70db83c4 JH |
2893 | conn->smp = NULL; |
2894 | l2cap_chan_put(chan); | |
2895 | } | |
2896 | ||
b5ae344d JH |
2897 | static void bredr_pairing(struct l2cap_chan *chan) |
2898 | { | |
2899 | struct l2cap_conn *conn = chan->conn; | |
2900 | struct hci_conn *hcon = conn->hcon; | |
2901 | struct hci_dev *hdev = hcon->hdev; | |
2902 | struct smp_cmd_pairing req; | |
2903 | struct smp_chan *smp; | |
2904 | ||
2905 | BT_DBG("chan %p", chan); | |
2906 | ||
2907 | /* Only new pairings are interesting */ | |
2908 | if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags)) | |
2909 | return; | |
2910 | ||
2911 | /* Don't bother if we're not encrypted */ | |
2912 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
2913 | return; | |
2914 | ||
2915 | /* Only master may initiate SMP over BR/EDR */ | |
2916 | if (hcon->role != HCI_ROLE_MASTER) | |
2917 | return; | |
2918 | ||
2919 | /* Secure Connections support must be enabled */ | |
d7a5a11d | 2920 | if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED)) |
b5ae344d JH |
2921 | return; |
2922 | ||
2923 | /* BR/EDR must use Secure Connections for SMP */ | |
2924 | if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) && | |
b7cb93e5 | 2925 | !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
b5ae344d JH |
2926 | return; |
2927 | ||
2928 | /* If our LE support is not enabled don't do anything */ | |
d7a5a11d | 2929 | if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) |
b5ae344d JH |
2930 | return; |
2931 | ||
2932 | /* Don't bother if remote LE support is not enabled */ | |
2933 | if (!lmp_host_le_capable(hcon)) | |
2934 | return; | |
2935 | ||
2936 | /* Remote must support SMP fixed chan for BR/EDR */ | |
2937 | if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR)) | |
2938 | return; | |
2939 | ||
2940 | /* Don't bother if SMP is already ongoing */ | |
2941 | if (chan->data) | |
2942 | return; | |
2943 | ||
2944 | smp = smp_chan_create(conn); | |
2945 | if (!smp) { | |
2946 | BT_ERR("%s unable to create SMP context for BR/EDR", | |
2947 | hdev->name); | |
2948 | return; | |
2949 | } | |
2950 | ||
2951 | set_bit(SMP_FLAG_SC, &smp->flags); | |
2952 | ||
2953 | BT_DBG("%s starting SMP over BR/EDR", hdev->name); | |
2954 | ||
2955 | /* Prepare and send the BR/EDR SMP Pairing Request */ | |
2956 | build_bredr_pairing_cmd(smp, &req, NULL); | |
2957 | ||
2958 | smp->preq[0] = SMP_CMD_PAIRING_REQ; | |
2959 | memcpy(&smp->preq[1], &req, sizeof(req)); | |
2960 | ||
2961 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req); | |
2962 | SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP); | |
2963 | } | |
2964 | ||
44f1a7ab JH |
2965 | static void smp_resume_cb(struct l2cap_chan *chan) |
2966 | { | |
b68fda68 | 2967 | struct smp_chan *smp = chan->data; |
44f1a7ab JH |
2968 | struct l2cap_conn *conn = chan->conn; |
2969 | struct hci_conn *hcon = conn->hcon; | |
2970 | ||
2971 | BT_DBG("chan %p", chan); | |
2972 | ||
b5ae344d JH |
2973 | if (hcon->type == ACL_LINK) { |
2974 | bredr_pairing(chan); | |
ef8efe4b | 2975 | return; |
b5ae344d | 2976 | } |
ef8efe4b | 2977 | |
86d1407c JH |
2978 | if (!smp) |
2979 | return; | |
b68fda68 | 2980 | |
84bc0db5 JH |
2981 | if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) |
2982 | return; | |
2983 | ||
86d1407c JH |
2984 | cancel_delayed_work(&smp->security_timer); |
2985 | ||
d6268e86 | 2986 | smp_distribute_keys(smp); |
44f1a7ab JH |
2987 | } |
2988 | ||
70db83c4 JH |
2989 | static void smp_ready_cb(struct l2cap_chan *chan) |
2990 | { | |
2991 | struct l2cap_conn *conn = chan->conn; | |
b5ae344d | 2992 | struct hci_conn *hcon = conn->hcon; |
70db83c4 JH |
2993 | |
2994 | BT_DBG("chan %p", chan); | |
2995 | ||
7883746b JH |
2996 | /* No need to call l2cap_chan_hold() here since we already own |
2997 | * the reference taken in smp_new_conn_cb(). This is just the | |
2998 | * first time that we tie it to a specific pointer. The code in | |
2999 | * l2cap_core.c ensures that there's no risk this function wont | |
3000 | * get called if smp_new_conn_cb was previously called. | |
3001 | */ | |
70db83c4 | 3002 | conn->smp = chan; |
b5ae344d JH |
3003 | |
3004 | if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags)) | |
3005 | bredr_pairing(chan); | |
70db83c4 JH |
3006 | } |
3007 | ||
4befb867 JH |
3008 | static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
3009 | { | |
3010 | int err; | |
3011 | ||
3012 | BT_DBG("chan %p", chan); | |
3013 | ||
3014 | err = smp_sig_channel(chan, skb); | |
3015 | if (err) { | |
b68fda68 | 3016 | struct smp_chan *smp = chan->data; |
4befb867 | 3017 | |
b68fda68 JH |
3018 | if (smp) |
3019 | cancel_delayed_work_sync(&smp->security_timer); | |
4befb867 | 3020 | |
1e91c29e | 3021 | hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE); |
4befb867 JH |
3022 | } |
3023 | ||
3024 | return err; | |
3025 | } | |
3026 | ||
70db83c4 JH |
3027 | static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan, |
3028 | unsigned long hdr_len, | |
3029 | unsigned long len, int nb) | |
3030 | { | |
3031 | struct sk_buff *skb; | |
3032 | ||
3033 | skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL); | |
3034 | if (!skb) | |
3035 | return ERR_PTR(-ENOMEM); | |
3036 | ||
3037 | skb->priority = HCI_PRIO_MAX; | |
a4368ff3 | 3038 | bt_cb(skb)->l2cap.chan = chan; |
70db83c4 JH |
3039 | |
3040 | return skb; | |
3041 | } | |
3042 | ||
3043 | static const struct l2cap_ops smp_chan_ops = { | |
3044 | .name = "Security Manager", | |
3045 | .ready = smp_ready_cb, | |
5d88cc73 | 3046 | .recv = smp_recv_cb, |
70db83c4 JH |
3047 | .alloc_skb = smp_alloc_skb_cb, |
3048 | .teardown = smp_teardown_cb, | |
44f1a7ab | 3049 | .resume = smp_resume_cb, |
70db83c4 JH |
3050 | |
3051 | .new_connection = l2cap_chan_no_new_connection, | |
70db83c4 JH |
3052 | .state_change = l2cap_chan_no_state_change, |
3053 | .close = l2cap_chan_no_close, | |
3054 | .defer = l2cap_chan_no_defer, | |
3055 | .suspend = l2cap_chan_no_suspend, | |
70db83c4 JH |
3056 | .set_shutdown = l2cap_chan_no_set_shutdown, |
3057 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3058 | }; |
3059 | ||
3060 | static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan) | |
3061 | { | |
3062 | struct l2cap_chan *chan; | |
3063 | ||
3064 | BT_DBG("pchan %p", pchan); | |
3065 | ||
3066 | chan = l2cap_chan_create(); | |
3067 | if (!chan) | |
3068 | return NULL; | |
3069 | ||
3070 | chan->chan_type = pchan->chan_type; | |
3071 | chan->ops = &smp_chan_ops; | |
3072 | chan->scid = pchan->scid; | |
3073 | chan->dcid = chan->scid; | |
3074 | chan->imtu = pchan->imtu; | |
3075 | chan->omtu = pchan->omtu; | |
3076 | chan->mode = pchan->mode; | |
3077 | ||
abe84903 JH |
3078 | /* Other L2CAP channels may request SMP routines in order to |
3079 | * change the security level. This means that the SMP channel | |
3080 | * lock must be considered in its own category to avoid lockdep | |
3081 | * warnings. | |
3082 | */ | |
3083 | atomic_set(&chan->nesting, L2CAP_NESTING_SMP); | |
3084 | ||
70db83c4 JH |
3085 | BT_DBG("created chan %p", chan); |
3086 | ||
3087 | return chan; | |
3088 | } | |
3089 | ||
3090 | static const struct l2cap_ops smp_root_chan_ops = { | |
3091 | .name = "Security Manager Root", | |
3092 | .new_connection = smp_new_conn_cb, | |
3093 | ||
3094 | /* None of these are implemented for the root channel */ | |
3095 | .close = l2cap_chan_no_close, | |
3096 | .alloc_skb = l2cap_chan_no_alloc_skb, | |
3097 | .recv = l2cap_chan_no_recv, | |
3098 | .state_change = l2cap_chan_no_state_change, | |
3099 | .teardown = l2cap_chan_no_teardown, | |
3100 | .ready = l2cap_chan_no_ready, | |
3101 | .defer = l2cap_chan_no_defer, | |
3102 | .suspend = l2cap_chan_no_suspend, | |
3103 | .resume = l2cap_chan_no_resume, | |
3104 | .set_shutdown = l2cap_chan_no_set_shutdown, | |
3105 | .get_sndtimeo = l2cap_chan_no_get_sndtimeo, | |
70db83c4 JH |
3106 | }; |
3107 | ||
ef8efe4b | 3108 | static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid) |
711eafe3 | 3109 | { |
70db83c4 | 3110 | struct l2cap_chan *chan; |
88a479d9 | 3111 | struct smp_dev *smp; |
a4770e11 | 3112 | struct crypto_cipher *tfm_aes; |
71af2f6b | 3113 | struct crypto_shash *tfm_cmac; |
70db83c4 | 3114 | |
ef8efe4b | 3115 | if (cid == L2CAP_CID_SMP_BREDR) { |
88a479d9 | 3116 | smp = NULL; |
ef8efe4b JH |
3117 | goto create_chan; |
3118 | } | |
711eafe3 | 3119 | |
88a479d9 MH |
3120 | smp = kzalloc(sizeof(*smp), GFP_KERNEL); |
3121 | if (!smp) | |
3122 | return ERR_PTR(-ENOMEM); | |
3123 | ||
a4770e11 | 3124 | tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
defce9e8 | 3125 | if (IS_ERR(tfm_aes)) { |
a4770e11 | 3126 | BT_ERR("Unable to create AES crypto context"); |
88a479d9 | 3127 | kzfree(smp); |
fe700771 | 3128 | return ERR_CAST(tfm_aes); |
711eafe3 JH |
3129 | } |
3130 | ||
71af2f6b | 3131 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0); |
6e2dc6d1 MH |
3132 | if (IS_ERR(tfm_cmac)) { |
3133 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 3134 | crypto_free_cipher(tfm_aes); |
6e2dc6d1 MH |
3135 | kzfree(smp); |
3136 | return ERR_CAST(tfm_cmac); | |
3137 | } | |
3138 | ||
88a479d9 | 3139 | smp->tfm_aes = tfm_aes; |
6e2dc6d1 | 3140 | smp->tfm_cmac = tfm_cmac; |
b1f663c9 | 3141 | smp->min_key_size = SMP_MIN_ENC_KEY_SIZE; |
2fd36558 | 3142 | smp->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
88a479d9 | 3143 | |
ef8efe4b | 3144 | create_chan: |
70db83c4 JH |
3145 | chan = l2cap_chan_create(); |
3146 | if (!chan) { | |
63511f6d | 3147 | if (smp) { |
a4770e11 | 3148 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 3149 | crypto_free_shash(smp->tfm_cmac); |
63511f6d MH |
3150 | kzfree(smp); |
3151 | } | |
ef8efe4b | 3152 | return ERR_PTR(-ENOMEM); |
70db83c4 JH |
3153 | } |
3154 | ||
88a479d9 | 3155 | chan->data = smp; |
defce9e8 | 3156 | |
ef8efe4b | 3157 | l2cap_add_scid(chan, cid); |
70db83c4 JH |
3158 | |
3159 | l2cap_chan_set_defaults(chan); | |
3160 | ||
157029ba | 3161 | if (cid == L2CAP_CID_SMP) { |
39e3e744 JH |
3162 | u8 bdaddr_type; |
3163 | ||
3164 | hci_copy_identity_address(hdev, &chan->src, &bdaddr_type); | |
3165 | ||
3166 | if (bdaddr_type == ADDR_LE_DEV_PUBLIC) | |
157029ba | 3167 | chan->src_type = BDADDR_LE_PUBLIC; |
39e3e744 JH |
3168 | else |
3169 | chan->src_type = BDADDR_LE_RANDOM; | |
157029ba MH |
3170 | } else { |
3171 | bacpy(&chan->src, &hdev->bdaddr); | |
ef8efe4b | 3172 | chan->src_type = BDADDR_BREDR; |
157029ba MH |
3173 | } |
3174 | ||
70db83c4 JH |
3175 | chan->state = BT_LISTEN; |
3176 | chan->mode = L2CAP_MODE_BASIC; | |
3177 | chan->imtu = L2CAP_DEFAULT_MTU; | |
3178 | chan->ops = &smp_root_chan_ops; | |
3179 | ||
abe84903 JH |
3180 | /* Set correct nesting level for a parent/listening channel */ |
3181 | atomic_set(&chan->nesting, L2CAP_NESTING_PARENT); | |
3182 | ||
ef8efe4b | 3183 | return chan; |
711eafe3 JH |
3184 | } |
3185 | ||
ef8efe4b | 3186 | static void smp_del_chan(struct l2cap_chan *chan) |
711eafe3 | 3187 | { |
88a479d9 | 3188 | struct smp_dev *smp; |
70db83c4 | 3189 | |
ef8efe4b | 3190 | BT_DBG("chan %p", chan); |
711eafe3 | 3191 | |
88a479d9 MH |
3192 | smp = chan->data; |
3193 | if (smp) { | |
defce9e8 | 3194 | chan->data = NULL; |
a4770e11 | 3195 | crypto_free_cipher(smp->tfm_aes); |
71af2f6b | 3196 | crypto_free_shash(smp->tfm_cmac); |
88a479d9 | 3197 | kzfree(smp); |
711eafe3 | 3198 | } |
70db83c4 | 3199 | |
70db83c4 | 3200 | l2cap_chan_put(chan); |
711eafe3 | 3201 | } |
ef8efe4b | 3202 | |
300acfde MH |
3203 | static ssize_t force_bredr_smp_read(struct file *file, |
3204 | char __user *user_buf, | |
3205 | size_t count, loff_t *ppos) | |
3206 | { | |
3207 | struct hci_dev *hdev = file->private_data; | |
3208 | char buf[3]; | |
3209 | ||
b7cb93e5 | 3210 | buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N'; |
300acfde MH |
3211 | buf[1] = '\n'; |
3212 | buf[2] = '\0'; | |
3213 | return simple_read_from_buffer(user_buf, count, ppos, buf, 2); | |
3214 | } | |
3215 | ||
3216 | static ssize_t force_bredr_smp_write(struct file *file, | |
3217 | const char __user *user_buf, | |
3218 | size_t count, loff_t *ppos) | |
3219 | { | |
3220 | struct hci_dev *hdev = file->private_data; | |
3221 | char buf[32]; | |
3222 | size_t buf_size = min(count, (sizeof(buf)-1)); | |
3223 | bool enable; | |
3224 | ||
3225 | if (copy_from_user(buf, user_buf, buf_size)) | |
3226 | return -EFAULT; | |
3227 | ||
3228 | buf[buf_size] = '\0'; | |
3229 | if (strtobool(buf, &enable)) | |
3230 | return -EINVAL; | |
3231 | ||
b7cb93e5 | 3232 | if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP)) |
300acfde MH |
3233 | return -EALREADY; |
3234 | ||
3235 | if (enable) { | |
3236 | struct l2cap_chan *chan; | |
3237 | ||
3238 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); | |
3239 | if (IS_ERR(chan)) | |
3240 | return PTR_ERR(chan); | |
3241 | ||
3242 | hdev->smp_bredr_data = chan; | |
3243 | } else { | |
3244 | struct l2cap_chan *chan; | |
3245 | ||
3246 | chan = hdev->smp_bredr_data; | |
3247 | hdev->smp_bredr_data = NULL; | |
3248 | smp_del_chan(chan); | |
3249 | } | |
3250 | ||
b7cb93e5 | 3251 | hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP); |
300acfde MH |
3252 | |
3253 | return count; | |
3254 | } | |
3255 | ||
3256 | static const struct file_operations force_bredr_smp_fops = { | |
3257 | .open = simple_open, | |
3258 | .read = force_bredr_smp_read, | |
3259 | .write = force_bredr_smp_write, | |
3260 | .llseek = default_llseek, | |
3261 | }; | |
3262 | ||
b1f663c9 JH |
3263 | static ssize_t le_min_key_size_read(struct file *file, |
3264 | char __user *user_buf, | |
3265 | size_t count, loff_t *ppos) | |
3266 | { | |
3267 | struct hci_dev *hdev = file->private_data; | |
3268 | char buf[4]; | |
3269 | ||
3270 | snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size); | |
3271 | ||
3272 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3273 | } | |
3274 | ||
3275 | static ssize_t le_min_key_size_write(struct file *file, | |
3276 | const char __user *user_buf, | |
3277 | size_t count, loff_t *ppos) | |
3278 | { | |
3279 | struct hci_dev *hdev = file->private_data; | |
3280 | char buf[32]; | |
3281 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3282 | u8 key_size; | |
3283 | ||
3284 | if (copy_from_user(buf, user_buf, buf_size)) | |
3285 | return -EFAULT; | |
3286 | ||
3287 | buf[buf_size] = '\0'; | |
3288 | ||
3289 | sscanf(buf, "%hhu", &key_size); | |
3290 | ||
3291 | if (key_size > SMP_DEV(hdev)->max_key_size || | |
3292 | key_size < SMP_MIN_ENC_KEY_SIZE) | |
3293 | return -EINVAL; | |
3294 | ||
3295 | SMP_DEV(hdev)->min_key_size = key_size; | |
3296 | ||
3297 | return count; | |
3298 | } | |
3299 | ||
3300 | static const struct file_operations le_min_key_size_fops = { | |
3301 | .open = simple_open, | |
3302 | .read = le_min_key_size_read, | |
3303 | .write = le_min_key_size_write, | |
3304 | .llseek = default_llseek, | |
3305 | }; | |
3306 | ||
2fd36558 JH |
3307 | static ssize_t le_max_key_size_read(struct file *file, |
3308 | char __user *user_buf, | |
3309 | size_t count, loff_t *ppos) | |
3310 | { | |
3311 | struct hci_dev *hdev = file->private_data; | |
3312 | char buf[4]; | |
3313 | ||
3314 | snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->max_key_size); | |
3315 | ||
3316 | return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf)); | |
3317 | } | |
3318 | ||
3319 | static ssize_t le_max_key_size_write(struct file *file, | |
3320 | const char __user *user_buf, | |
3321 | size_t count, loff_t *ppos) | |
3322 | { | |
3323 | struct hci_dev *hdev = file->private_data; | |
3324 | char buf[32]; | |
3325 | size_t buf_size = min(count, (sizeof(buf) - 1)); | |
3326 | u8 key_size; | |
3327 | ||
3328 | if (copy_from_user(buf, user_buf, buf_size)) | |
3329 | return -EFAULT; | |
3330 | ||
3331 | buf[buf_size] = '\0'; | |
3332 | ||
3333 | sscanf(buf, "%hhu", &key_size); | |
3334 | ||
b1f663c9 JH |
3335 | if (key_size > SMP_MAX_ENC_KEY_SIZE || |
3336 | key_size < SMP_DEV(hdev)->min_key_size) | |
2fd36558 JH |
3337 | return -EINVAL; |
3338 | ||
3339 | SMP_DEV(hdev)->max_key_size = key_size; | |
3340 | ||
3341 | return count; | |
3342 | } | |
3343 | ||
3344 | static const struct file_operations le_max_key_size_fops = { | |
3345 | .open = simple_open, | |
3346 | .read = le_max_key_size_read, | |
3347 | .write = le_max_key_size_write, | |
3348 | .llseek = default_llseek, | |
3349 | }; | |
3350 | ||
ef8efe4b JH |
3351 | int smp_register(struct hci_dev *hdev) |
3352 | { | |
3353 | struct l2cap_chan *chan; | |
3354 | ||
3355 | BT_DBG("%s", hdev->name); | |
3356 | ||
7e7ec445 MH |
3357 | /* If the controller does not support Low Energy operation, then |
3358 | * there is also no need to register any SMP channel. | |
3359 | */ | |
3360 | if (!lmp_le_capable(hdev)) | |
3361 | return 0; | |
3362 | ||
2b8df323 MH |
3363 | if (WARN_ON(hdev->smp_data)) { |
3364 | chan = hdev->smp_data; | |
3365 | hdev->smp_data = NULL; | |
3366 | smp_del_chan(chan); | |
3367 | } | |
3368 | ||
ef8efe4b JH |
3369 | chan = smp_add_cid(hdev, L2CAP_CID_SMP); |
3370 | if (IS_ERR(chan)) | |
3371 | return PTR_ERR(chan); | |
3372 | ||
3373 | hdev->smp_data = chan; | |
3374 | ||
b1f663c9 JH |
3375 | debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev, |
3376 | &le_min_key_size_fops); | |
2fd36558 JH |
3377 | debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev, |
3378 | &le_max_key_size_fops); | |
3379 | ||
300acfde MH |
3380 | /* If the controller does not support BR/EDR Secure Connections |
3381 | * feature, then the BR/EDR SMP channel shall not be present. | |
3382 | * | |
3383 | * To test this with Bluetooth 4.0 controllers, create a debugfs | |
3384 | * switch that allows forcing BR/EDR SMP support and accepting | |
3385 | * cross-transport pairing on non-AES encrypted connections. | |
3386 | */ | |
3387 | if (!lmp_sc_capable(hdev)) { | |
3388 | debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs, | |
3389 | hdev, &force_bredr_smp_fops); | |
ef8efe4b | 3390 | return 0; |
300acfde | 3391 | } |
ef8efe4b | 3392 | |
2b8df323 MH |
3393 | if (WARN_ON(hdev->smp_bredr_data)) { |
3394 | chan = hdev->smp_bredr_data; | |
3395 | hdev->smp_bredr_data = NULL; | |
3396 | smp_del_chan(chan); | |
3397 | } | |
3398 | ||
ef8efe4b JH |
3399 | chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR); |
3400 | if (IS_ERR(chan)) { | |
3401 | int err = PTR_ERR(chan); | |
3402 | chan = hdev->smp_data; | |
3403 | hdev->smp_data = NULL; | |
3404 | smp_del_chan(chan); | |
3405 | return err; | |
3406 | } | |
3407 | ||
3408 | hdev->smp_bredr_data = chan; | |
3409 | ||
3410 | return 0; | |
3411 | } | |
3412 | ||
3413 | void smp_unregister(struct hci_dev *hdev) | |
3414 | { | |
3415 | struct l2cap_chan *chan; | |
3416 | ||
3417 | if (hdev->smp_bredr_data) { | |
3418 | chan = hdev->smp_bredr_data; | |
3419 | hdev->smp_bredr_data = NULL; | |
3420 | smp_del_chan(chan); | |
3421 | } | |
3422 | ||
3423 | if (hdev->smp_data) { | |
3424 | chan = hdev->smp_data; | |
3425 | hdev->smp_data = NULL; | |
3426 | smp_del_chan(chan); | |
3427 | } | |
3428 | } | |
0a2b0f04 JH |
3429 | |
3430 | #if IS_ENABLED(CONFIG_BT_SELFTEST_SMP) | |
3431 | ||
a4770e11 | 3432 | static int __init test_ah(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3433 | { |
3434 | const u8 irk[16] = { | |
3435 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3436 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3437 | const u8 r[3] = { 0x94, 0x81, 0x70 }; | |
3438 | const u8 exp[3] = { 0xaa, 0xfb, 0x0d }; | |
3439 | u8 res[3]; | |
3440 | int err; | |
3441 | ||
3442 | err = smp_ah(tfm_aes, irk, r, res); | |
3443 | if (err) | |
3444 | return err; | |
3445 | ||
3446 | if (memcmp(res, exp, 3)) | |
3447 | return -EINVAL; | |
3448 | ||
3449 | return 0; | |
3450 | } | |
3451 | ||
a4770e11 | 3452 | static int __init test_c1(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3453 | { |
3454 | const u8 k[16] = { | |
3455 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3456 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3457 | const u8 r[16] = { | |
3458 | 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63, | |
3459 | 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 }; | |
3460 | const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 }; | |
3461 | const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 }; | |
3462 | const u8 _iat = 0x01; | |
3463 | const u8 _rat = 0x00; | |
3464 | const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } }; | |
3465 | const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } }; | |
3466 | const u8 exp[16] = { | |
3467 | 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2, | |
3468 | 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e }; | |
3469 | u8 res[16]; | |
3470 | int err; | |
3471 | ||
3472 | err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res); | |
3473 | if (err) | |
3474 | return err; | |
3475 | ||
3476 | if (memcmp(res, exp, 16)) | |
3477 | return -EINVAL; | |
3478 | ||
3479 | return 0; | |
3480 | } | |
3481 | ||
a4770e11 | 3482 | static int __init test_s1(struct crypto_cipher *tfm_aes) |
cfc4198e JH |
3483 | { |
3484 | const u8 k[16] = { | |
3485 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
3486 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; | |
3487 | const u8 r1[16] = { | |
3488 | 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 }; | |
3489 | const u8 r2[16] = { | |
3490 | 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 }; | |
3491 | const u8 exp[16] = { | |
3492 | 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b, | |
3493 | 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a }; | |
3494 | u8 res[16]; | |
3495 | int err; | |
3496 | ||
3497 | err = smp_s1(tfm_aes, k, r1, r2, res); | |
3498 | if (err) | |
3499 | return err; | |
3500 | ||
3501 | if (memcmp(res, exp, 16)) | |
3502 | return -EINVAL; | |
3503 | ||
3504 | return 0; | |
3505 | } | |
3506 | ||
71af2f6b | 3507 | static int __init test_f4(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3508 | { |
3509 | const u8 u[32] = { | |
3510 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3511 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3512 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3513 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3514 | const u8 v[32] = { | |
3515 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3516 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3517 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3518 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3519 | const u8 x[16] = { | |
3520 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3521 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3522 | const u8 z = 0x00; | |
3523 | const u8 exp[16] = { | |
3524 | 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1, | |
3525 | 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 }; | |
3526 | u8 res[16]; | |
3527 | int err; | |
3528 | ||
3529 | err = smp_f4(tfm_cmac, u, v, x, z, res); | |
3530 | if (err) | |
3531 | return err; | |
3532 | ||
3533 | if (memcmp(res, exp, 16)) | |
3534 | return -EINVAL; | |
3535 | ||
3536 | return 0; | |
3537 | } | |
3538 | ||
71af2f6b | 3539 | static int __init test_f5(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3540 | { |
3541 | const u8 w[32] = { | |
3542 | 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86, | |
3543 | 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99, | |
3544 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3545 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3546 | const u8 n1[16] = { | |
3547 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3548 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3549 | const u8 n2[16] = { | |
3550 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3551 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3552 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3553 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3554 | const u8 exp_ltk[16] = { | |
3555 | 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98, | |
3556 | 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 }; | |
3557 | const u8 exp_mackey[16] = { | |
3558 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3559 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3560 | u8 mackey[16], ltk[16]; | |
3561 | int err; | |
3562 | ||
3563 | err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk); | |
3564 | if (err) | |
3565 | return err; | |
3566 | ||
3567 | if (memcmp(mackey, exp_mackey, 16)) | |
3568 | return -EINVAL; | |
3569 | ||
3570 | if (memcmp(ltk, exp_ltk, 16)) | |
3571 | return -EINVAL; | |
3572 | ||
3573 | return 0; | |
3574 | } | |
3575 | ||
71af2f6b | 3576 | static int __init test_f6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3577 | { |
3578 | const u8 w[16] = { | |
3579 | 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd, | |
3580 | 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 }; | |
3581 | const u8 n1[16] = { | |
3582 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3583 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3584 | const u8 n2[16] = { | |
3585 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3586 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3587 | const u8 r[16] = { | |
3588 | 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08, | |
3589 | 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 }; | |
3590 | const u8 io_cap[3] = { 0x02, 0x01, 0x01 }; | |
3591 | const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 }; | |
3592 | const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 }; | |
3593 | const u8 exp[16] = { | |
3594 | 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2, | |
3595 | 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 }; | |
3596 | u8 res[16]; | |
3597 | int err; | |
3598 | ||
3599 | err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res); | |
3600 | if (err) | |
3601 | return err; | |
3602 | ||
3603 | if (memcmp(res, exp, 16)) | |
3604 | return -EINVAL; | |
3605 | ||
3606 | return 0; | |
3607 | } | |
3608 | ||
71af2f6b | 3609 | static int __init test_g2(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3610 | { |
3611 | const u8 u[32] = { | |
3612 | 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc, | |
3613 | 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef, | |
3614 | 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e, | |
3615 | 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 }; | |
3616 | const u8 v[32] = { | |
3617 | 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b, | |
3618 | 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59, | |
3619 | 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90, | |
3620 | 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 }; | |
3621 | const u8 x[16] = { | |
3622 | 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff, | |
3623 | 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 }; | |
3624 | const u8 y[16] = { | |
3625 | 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21, | |
3626 | 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 }; | |
3627 | const u32 exp_val = 0x2f9ed5ba % 1000000; | |
3628 | u32 val; | |
3629 | int err; | |
3630 | ||
3631 | err = smp_g2(tfm_cmac, u, v, x, y, &val); | |
3632 | if (err) | |
3633 | return err; | |
3634 | ||
3635 | if (val != exp_val) | |
3636 | return -EINVAL; | |
3637 | ||
3638 | return 0; | |
3639 | } | |
3640 | ||
71af2f6b | 3641 | static int __init test_h6(struct crypto_shash *tfm_cmac) |
fb2969a3 JH |
3642 | { |
3643 | const u8 w[16] = { | |
3644 | 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34, | |
3645 | 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec }; | |
3646 | const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c }; | |
3647 | const u8 exp[16] = { | |
3648 | 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8, | |
3649 | 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d }; | |
3650 | u8 res[16]; | |
3651 | int err; | |
3652 | ||
3653 | err = smp_h6(tfm_cmac, w, key_id, res); | |
3654 | if (err) | |
3655 | return err; | |
3656 | ||
3657 | if (memcmp(res, exp, 16)) | |
3658 | return -EINVAL; | |
3659 | ||
3660 | return 0; | |
3661 | } | |
3662 | ||
64dd374e MH |
3663 | static char test_smp_buffer[32]; |
3664 | ||
3665 | static ssize_t test_smp_read(struct file *file, char __user *user_buf, | |
3666 | size_t count, loff_t *ppos) | |
3667 | { | |
3668 | return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer, | |
3669 | strlen(test_smp_buffer)); | |
3670 | } | |
3671 | ||
3672 | static const struct file_operations test_smp_fops = { | |
3673 | .open = simple_open, | |
3674 | .read = test_smp_read, | |
3675 | .llseek = default_llseek, | |
3676 | }; | |
3677 | ||
a4770e11 | 3678 | static int __init run_selftests(struct crypto_cipher *tfm_aes, |
71af2f6b | 3679 | struct crypto_shash *tfm_cmac) |
0a2b0f04 | 3680 | { |
255047b0 MH |
3681 | ktime_t calltime, delta, rettime; |
3682 | unsigned long long duration; | |
cfc4198e JH |
3683 | int err; |
3684 | ||
255047b0 MH |
3685 | calltime = ktime_get(); |
3686 | ||
cfc4198e JH |
3687 | err = test_ah(tfm_aes); |
3688 | if (err) { | |
3689 | BT_ERR("smp_ah test failed"); | |
64dd374e | 3690 | goto done; |
cfc4198e JH |
3691 | } |
3692 | ||
3693 | err = test_c1(tfm_aes); | |
3694 | if (err) { | |
3695 | BT_ERR("smp_c1 test failed"); | |
64dd374e | 3696 | goto done; |
cfc4198e JH |
3697 | } |
3698 | ||
3699 | err = test_s1(tfm_aes); | |
3700 | if (err) { | |
3701 | BT_ERR("smp_s1 test failed"); | |
64dd374e | 3702 | goto done; |
cfc4198e JH |
3703 | } |
3704 | ||
fb2969a3 JH |
3705 | err = test_f4(tfm_cmac); |
3706 | if (err) { | |
3707 | BT_ERR("smp_f4 test failed"); | |
64dd374e | 3708 | goto done; |
fb2969a3 JH |
3709 | } |
3710 | ||
3711 | err = test_f5(tfm_cmac); | |
3712 | if (err) { | |
3713 | BT_ERR("smp_f5 test failed"); | |
64dd374e | 3714 | goto done; |
fb2969a3 JH |
3715 | } |
3716 | ||
3717 | err = test_f6(tfm_cmac); | |
3718 | if (err) { | |
3719 | BT_ERR("smp_f6 test failed"); | |
64dd374e | 3720 | goto done; |
fb2969a3 JH |
3721 | } |
3722 | ||
3723 | err = test_g2(tfm_cmac); | |
3724 | if (err) { | |
3725 | BT_ERR("smp_g2 test failed"); | |
64dd374e | 3726 | goto done; |
fb2969a3 JH |
3727 | } |
3728 | ||
3729 | err = test_h6(tfm_cmac); | |
3730 | if (err) { | |
3731 | BT_ERR("smp_h6 test failed"); | |
64dd374e | 3732 | goto done; |
fb2969a3 JH |
3733 | } |
3734 | ||
255047b0 MH |
3735 | rettime = ktime_get(); |
3736 | delta = ktime_sub(rettime, calltime); | |
3737 | duration = (unsigned long long) ktime_to_ns(delta) >> 10; | |
3738 | ||
5ced2464 | 3739 | BT_INFO("SMP test passed in %llu usecs", duration); |
0a2b0f04 | 3740 | |
64dd374e MH |
3741 | done: |
3742 | if (!err) | |
3743 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), | |
3744 | "PASS (%llu usecs)\n", duration); | |
3745 | else | |
3746 | snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n"); | |
3747 | ||
3748 | debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL, | |
3749 | &test_smp_fops); | |
3750 | ||
3751 | return err; | |
0a2b0f04 JH |
3752 | } |
3753 | ||
3754 | int __init bt_selftest_smp(void) | |
3755 | { | |
a4770e11 | 3756 | struct crypto_cipher *tfm_aes; |
71af2f6b | 3757 | struct crypto_shash *tfm_cmac; |
0a2b0f04 JH |
3758 | int err; |
3759 | ||
a4770e11 | 3760 | tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 | 3761 | if (IS_ERR(tfm_aes)) { |
a4770e11 | 3762 | BT_ERR("Unable to create AES crypto context"); |
0a2b0f04 JH |
3763 | return PTR_ERR(tfm_aes); |
3764 | } | |
3765 | ||
71af2f6b | 3766 | tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, CRYPTO_ALG_ASYNC); |
0a2b0f04 JH |
3767 | if (IS_ERR(tfm_cmac)) { |
3768 | BT_ERR("Unable to create CMAC crypto context"); | |
a4770e11 | 3769 | crypto_free_cipher(tfm_aes); |
0a2b0f04 JH |
3770 | return PTR_ERR(tfm_cmac); |
3771 | } | |
3772 | ||
3773 | err = run_selftests(tfm_aes, tfm_cmac); | |
3774 | ||
71af2f6b | 3775 | crypto_free_shash(tfm_cmac); |
a4770e11 | 3776 | crypto_free_cipher(tfm_aes); |
0a2b0f04 JH |
3777 | |
3778 | return err; | |
3779 | } | |
3780 | ||
3781 | #endif |