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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 | ||
8c520a59 GP |
23 | #include <linux/crypto.h> |
24 | #include <linux/scatterlist.h> | |
25 | #include <crypto/b128ops.h> | |
26 | ||
eb492e01 AB |
27 | #include <net/bluetooth/bluetooth.h> |
28 | #include <net/bluetooth/hci_core.h> | |
29 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 30 | #include <net/bluetooth/mgmt.h> |
eb492e01 | 31 | #include <net/bluetooth/smp.h> |
d22ef0bc | 32 | |
17b02e62 | 33 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 34 | |
065a13e2 JH |
35 | #define AUTH_REQ_MASK 0x07 |
36 | ||
d22ef0bc AB |
37 | static inline void swap128(u8 src[16], u8 dst[16]) |
38 | { | |
39 | int i; | |
40 | for (i = 0; i < 16; i++) | |
41 | dst[15 - i] = src[i]; | |
42 | } | |
43 | ||
44 | static inline void swap56(u8 src[7], u8 dst[7]) | |
45 | { | |
46 | int i; | |
47 | for (i = 0; i < 7; i++) | |
48 | dst[6 - i] = src[i]; | |
49 | } | |
50 | ||
51 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
52 | { | |
53 | struct blkcipher_desc desc; | |
54 | struct scatterlist sg; | |
55 | int err, iv_len; | |
56 | unsigned char iv[128]; | |
57 | ||
58 | if (tfm == NULL) { | |
59 | BT_ERR("tfm %p", tfm); | |
60 | return -EINVAL; | |
61 | } | |
62 | ||
63 | desc.tfm = tfm; | |
64 | desc.flags = 0; | |
65 | ||
66 | err = crypto_blkcipher_setkey(tfm, k, 16); | |
67 | if (err) { | |
68 | BT_ERR("cipher setkey failed: %d", err); | |
69 | return err; | |
70 | } | |
71 | ||
72 | sg_init_one(&sg, r, 16); | |
73 | ||
74 | iv_len = crypto_blkcipher_ivsize(tfm); | |
75 | if (iv_len) { | |
76 | memset(&iv, 0xff, iv_len); | |
77 | crypto_blkcipher_set_iv(tfm, iv, iv_len); | |
78 | } | |
79 | ||
80 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); | |
81 | if (err) | |
82 | BT_ERR("Encrypt data error %d", err); | |
83 | ||
84 | return err; | |
85 | } | |
86 | ||
87 | static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16], | |
88 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, | |
89 | u8 _rat, bdaddr_t *ra, u8 res[16]) | |
90 | { | |
91 | u8 p1[16], p2[16]; | |
92 | int err; | |
93 | ||
94 | memset(p1, 0, 16); | |
95 | ||
96 | /* p1 = pres || preq || _rat || _iat */ | |
97 | swap56(pres, p1); | |
98 | swap56(preq, p1 + 7); | |
99 | p1[14] = _rat; | |
100 | p1[15] = _iat; | |
101 | ||
102 | memset(p2, 0, 16); | |
103 | ||
104 | /* p2 = padding || ia || ra */ | |
105 | baswap((bdaddr_t *) (p2 + 4), ia); | |
106 | baswap((bdaddr_t *) (p2 + 10), ra); | |
107 | ||
108 | /* res = r XOR p1 */ | |
109 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
110 | ||
111 | /* res = e(k, res) */ | |
112 | err = smp_e(tfm, k, res); | |
113 | if (err) { | |
114 | BT_ERR("Encrypt data error"); | |
115 | return err; | |
116 | } | |
117 | ||
118 | /* res = res XOR p2 */ | |
119 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
120 | ||
121 | /* res = e(k, res) */ | |
122 | err = smp_e(tfm, k, res); | |
123 | if (err) | |
124 | BT_ERR("Encrypt data error"); | |
125 | ||
126 | return err; | |
127 | } | |
128 | ||
129 | static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16], | |
130 | u8 r1[16], u8 r2[16], u8 _r[16]) | |
131 | { | |
132 | int err; | |
133 | ||
134 | /* Just least significant octets from r1 and r2 are considered */ | |
135 | memcpy(_r, r1 + 8, 8); | |
136 | memcpy(_r + 8, r2 + 8, 8); | |
137 | ||
138 | err = smp_e(tfm, k, _r); | |
139 | if (err) | |
140 | BT_ERR("Encrypt data error"); | |
141 | ||
142 | return err; | |
143 | } | |
144 | ||
145 | static int smp_rand(u8 *buf) | |
146 | { | |
147 | get_random_bytes(buf, 16); | |
148 | ||
149 | return 0; | |
150 | } | |
eb492e01 AB |
151 | |
152 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, | |
153 | u16 dlen, void *data) | |
154 | { | |
155 | struct sk_buff *skb; | |
156 | struct l2cap_hdr *lh; | |
157 | int len; | |
158 | ||
159 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; | |
160 | ||
161 | if (len > conn->mtu) | |
162 | return NULL; | |
163 | ||
164 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
165 | if (!skb) | |
166 | return NULL; | |
167 | ||
168 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
169 | lh->len = cpu_to_le16(sizeof(code) + dlen); | |
d8aece2a | 170 | lh->cid = __constant_cpu_to_le16(L2CAP_CID_SMP); |
eb492e01 AB |
171 | |
172 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); | |
173 | ||
174 | memcpy(skb_put(skb, dlen), data, dlen); | |
175 | ||
176 | return skb; | |
177 | } | |
178 | ||
179 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) | |
180 | { | |
181 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); | |
182 | ||
183 | BT_DBG("code 0x%2.2x", code); | |
184 | ||
185 | if (!skb) | |
186 | return; | |
187 | ||
73d80deb LAD |
188 | skb->priority = HCI_PRIO_MAX; |
189 | hci_send_acl(conn->hchan, skb, 0); | |
e2dcd113 | 190 | |
6c9d42a1 | 191 | cancel_delayed_work_sync(&conn->security_timer); |
17b02e62 | 192 | schedule_delayed_work(&conn->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
193 | } |
194 | ||
2b64d153 BG |
195 | static __u8 authreq_to_seclevel(__u8 authreq) |
196 | { | |
197 | if (authreq & SMP_AUTH_MITM) | |
198 | return BT_SECURITY_HIGH; | |
199 | else | |
200 | return BT_SECURITY_MEDIUM; | |
201 | } | |
202 | ||
203 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
204 | { | |
205 | switch (sec_level) { | |
206 | case BT_SECURITY_HIGH: | |
207 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
208 | case BT_SECURITY_MEDIUM: | |
209 | return SMP_AUTH_BONDING; | |
210 | default: | |
211 | return SMP_AUTH_NONE; | |
212 | } | |
213 | } | |
214 | ||
b8e66eac | 215 | static void build_pairing_cmd(struct l2cap_conn *conn, |
54790f73 VCG |
216 | struct smp_cmd_pairing *req, |
217 | struct smp_cmd_pairing *rsp, | |
218 | __u8 authreq) | |
b8e66eac | 219 | { |
2b64d153 | 220 | u8 dist_keys = 0; |
54790f73 | 221 | |
a8b2d5c2 | 222 | if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->dev_flags)) { |
ca10b5ee | 223 | dist_keys = SMP_DIST_ENC_KEY; |
54790f73 | 224 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
225 | } else { |
226 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
227 | } |
228 | ||
229 | if (rsp == NULL) { | |
230 | req->io_capability = conn->hcon->io_capability; | |
231 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
232 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
2b64d153 | 233 | req->init_key_dist = 0; |
54790f73 | 234 | req->resp_key_dist = dist_keys; |
065a13e2 | 235 | req->auth_req = (authreq & AUTH_REQ_MASK); |
54790f73 VCG |
236 | return; |
237 | } | |
238 | ||
239 | rsp->io_capability = conn->hcon->io_capability; | |
240 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
241 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
2b64d153 | 242 | rsp->init_key_dist = 0; |
54790f73 | 243 | rsp->resp_key_dist = req->resp_key_dist & dist_keys; |
065a13e2 | 244 | rsp->auth_req = (authreq & AUTH_REQ_MASK); |
b8e66eac VCG |
245 | } |
246 | ||
3158c50c VCG |
247 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
248 | { | |
1c1def09 VCG |
249 | struct smp_chan *smp = conn->smp_chan; |
250 | ||
3158c50c VCG |
251 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
252 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) | |
253 | return SMP_ENC_KEY_SIZE; | |
254 | ||
f7aa611a | 255 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
256 | |
257 | return 0; | |
258 | } | |
259 | ||
4f957a76 BG |
260 | static void smp_failure(struct l2cap_conn *conn, u8 reason, u8 send) |
261 | { | |
bab73cb6 JH |
262 | struct hci_conn *hcon = conn->hcon; |
263 | ||
4f957a76 BG |
264 | if (send) |
265 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), | |
266 | &reason); | |
267 | ||
51a8efd7 | 268 | clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->hcon->flags); |
bab73cb6 | 269 | mgmt_auth_failed(conn->hcon->hdev, conn->dst, hcon->type, |
896ea28e | 270 | hcon->dst_type, HCI_ERROR_AUTH_FAILURE); |
f1c09c07 | 271 | |
61a0cfb0 AG |
272 | cancel_delayed_work_sync(&conn->security_timer); |
273 | ||
274 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) | |
f1c09c07 | 275 | smp_chan_destroy(conn); |
4f957a76 BG |
276 | } |
277 | ||
2b64d153 BG |
278 | #define JUST_WORKS 0x00 |
279 | #define JUST_CFM 0x01 | |
280 | #define REQ_PASSKEY 0x02 | |
281 | #define CFM_PASSKEY 0x03 | |
282 | #define REQ_OOB 0x04 | |
283 | #define OVERLAP 0xFF | |
284 | ||
285 | static const u8 gen_method[5][5] = { | |
286 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
287 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
288 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
289 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
290 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
291 | }; | |
292 | ||
293 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, | |
294 | u8 local_io, u8 remote_io) | |
295 | { | |
296 | struct hci_conn *hcon = conn->hcon; | |
297 | struct smp_chan *smp = conn->smp_chan; | |
298 | u8 method; | |
299 | u32 passkey = 0; | |
300 | int ret = 0; | |
301 | ||
302 | /* Initialize key for JUST WORKS */ | |
303 | memset(smp->tk, 0, sizeof(smp->tk)); | |
304 | clear_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
305 | ||
306 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
307 | ||
308 | /* If neither side wants MITM, use JUST WORKS */ | |
309 | /* If either side has unknown io_caps, use JUST WORKS */ | |
310 | /* Otherwise, look up method from the table */ | |
311 | if (!(auth & SMP_AUTH_MITM) || | |
312 | local_io > SMP_IO_KEYBOARD_DISPLAY || | |
313 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
314 | method = JUST_WORKS; | |
315 | else | |
b3ff53ff | 316 | method = gen_method[remote_io][local_io]; |
2b64d153 BG |
317 | |
318 | /* If not bonding, don't ask user to confirm a Zero TK */ | |
319 | if (!(auth & SMP_AUTH_BONDING) && method == JUST_CFM) | |
320 | method = JUST_WORKS; | |
321 | ||
322 | /* If Just Works, Continue with Zero TK */ | |
323 | if (method == JUST_WORKS) { | |
324 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
325 | return 0; | |
326 | } | |
327 | ||
328 | /* Not Just Works/Confirm results in MITM Authentication */ | |
329 | if (method != JUST_CFM) | |
330 | set_bit(SMP_FLAG_MITM_AUTH, &smp->smp_flags); | |
331 | ||
332 | /* If both devices have Keyoard-Display I/O, the master | |
333 | * Confirms and the slave Enters the passkey. | |
334 | */ | |
335 | if (method == OVERLAP) { | |
336 | if (hcon->link_mode & HCI_LM_MASTER) | |
337 | method = CFM_PASSKEY; | |
338 | else | |
339 | method = REQ_PASSKEY; | |
340 | } | |
341 | ||
342 | /* Generate random passkey. Not valid until confirmed. */ | |
343 | if (method == CFM_PASSKEY) { | |
344 | u8 key[16]; | |
345 | ||
346 | memset(key, 0, sizeof(key)); | |
347 | get_random_bytes(&passkey, sizeof(passkey)); | |
348 | passkey %= 1000000; | |
349 | put_unaligned_le32(passkey, key); | |
350 | swap128(key, smp->tk); | |
351 | BT_DBG("PassKey: %d", passkey); | |
352 | } | |
353 | ||
354 | hci_dev_lock(hcon->hdev); | |
355 | ||
356 | if (method == REQ_PASSKEY) | |
272d90df JH |
357 | ret = mgmt_user_passkey_request(hcon->hdev, conn->dst, |
358 | hcon->type, hcon->dst_type); | |
2b64d153 BG |
359 | else |
360 | ret = mgmt_user_confirm_request(hcon->hdev, conn->dst, | |
272d90df | 361 | hcon->type, hcon->dst_type, |
2b64d153 BG |
362 | cpu_to_le32(passkey), 0); |
363 | ||
364 | hci_dev_unlock(hcon->hdev); | |
365 | ||
366 | return ret; | |
367 | } | |
368 | ||
8aab4757 VCG |
369 | static void confirm_work(struct work_struct *work) |
370 | { | |
371 | struct smp_chan *smp = container_of(work, struct smp_chan, confirm); | |
372 | struct l2cap_conn *conn = smp->conn; | |
373 | struct crypto_blkcipher *tfm; | |
374 | struct smp_cmd_pairing_confirm cp; | |
375 | int ret; | |
376 | u8 res[16], reason; | |
377 | ||
378 | BT_DBG("conn %p", conn); | |
379 | ||
380 | tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); | |
381 | if (IS_ERR(tfm)) { | |
382 | reason = SMP_UNSPECIFIED; | |
383 | goto error; | |
384 | } | |
385 | ||
386 | smp->tfm = tfm; | |
387 | ||
388 | if (conn->hcon->out) | |
389 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0, | |
04124681 | 390 | conn->src, conn->hcon->dst_type, conn->dst, res); |
8aab4757 VCG |
391 | else |
392 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, | |
04124681 GP |
393 | conn->hcon->dst_type, conn->dst, 0, conn->src, |
394 | res); | |
8aab4757 VCG |
395 | if (ret) { |
396 | reason = SMP_UNSPECIFIED; | |
397 | goto error; | |
398 | } | |
399 | ||
2b64d153 BG |
400 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); |
401 | ||
8aab4757 VCG |
402 | swap128(res, cp.confirm_val); |
403 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); | |
404 | ||
405 | return; | |
406 | ||
407 | error: | |
4f957a76 | 408 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
409 | } |
410 | ||
411 | static void random_work(struct work_struct *work) | |
412 | { | |
413 | struct smp_chan *smp = container_of(work, struct smp_chan, random); | |
414 | struct l2cap_conn *conn = smp->conn; | |
415 | struct hci_conn *hcon = conn->hcon; | |
416 | struct crypto_blkcipher *tfm = smp->tfm; | |
417 | u8 reason, confirm[16], res[16], key[16]; | |
418 | int ret; | |
419 | ||
420 | if (IS_ERR_OR_NULL(tfm)) { | |
421 | reason = SMP_UNSPECIFIED; | |
422 | goto error; | |
423 | } | |
424 | ||
425 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
426 | ||
427 | if (hcon->out) | |
428 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0, | |
04124681 | 429 | conn->src, hcon->dst_type, conn->dst, res); |
8aab4757 VCG |
430 | else |
431 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, | |
04124681 | 432 | hcon->dst_type, conn->dst, 0, conn->src, res); |
8aab4757 VCG |
433 | if (ret) { |
434 | reason = SMP_UNSPECIFIED; | |
435 | goto error; | |
436 | } | |
437 | ||
438 | swap128(res, confirm); | |
439 | ||
440 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { | |
441 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
442 | reason = SMP_CONFIRM_FAILED; | |
443 | goto error; | |
444 | } | |
445 | ||
446 | if (hcon->out) { | |
447 | u8 stk[16], rand[8]; | |
448 | __le16 ediv; | |
449 | ||
450 | memset(rand, 0, sizeof(rand)); | |
451 | ediv = 0; | |
452 | ||
453 | smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key); | |
454 | swap128(key, stk); | |
455 | ||
f7aa611a | 456 | memset(stk + smp->enc_key_size, 0, |
04124681 | 457 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 458 | |
51a8efd7 | 459 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) { |
8aab4757 VCG |
460 | reason = SMP_UNSPECIFIED; |
461 | goto error; | |
462 | } | |
463 | ||
464 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 465 | hcon->enc_key_size = smp->enc_key_size; |
8aab4757 VCG |
466 | } else { |
467 | u8 stk[16], r[16], rand[8]; | |
468 | __le16 ediv; | |
469 | ||
470 | memset(rand, 0, sizeof(rand)); | |
471 | ediv = 0; | |
472 | ||
473 | swap128(smp->prnd, r); | |
474 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r); | |
475 | ||
476 | smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key); | |
477 | swap128(key, stk); | |
478 | ||
f7aa611a VCG |
479 | memset(stk + smp->enc_key_size, 0, |
480 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); | |
8aab4757 | 481 | |
c9839a11 | 482 | hci_add_ltk(hcon->hdev, conn->dst, hcon->dst_type, |
04124681 GP |
483 | HCI_SMP_STK_SLAVE, 0, 0, stk, smp->enc_key_size, |
484 | ediv, rand); | |
8aab4757 VCG |
485 | } |
486 | ||
487 | return; | |
488 | ||
489 | error: | |
4f957a76 | 490 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
491 | } |
492 | ||
493 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) | |
494 | { | |
495 | struct smp_chan *smp; | |
496 | ||
497 | smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC); | |
498 | if (!smp) | |
499 | return NULL; | |
500 | ||
501 | INIT_WORK(&smp->confirm, confirm_work); | |
502 | INIT_WORK(&smp->random, random_work); | |
503 | ||
504 | smp->conn = conn; | |
505 | conn->smp_chan = smp; | |
2b64d153 | 506 | conn->hcon->smp_conn = conn; |
8aab4757 VCG |
507 | |
508 | hci_conn_hold(conn->hcon); | |
509 | ||
510 | return smp; | |
511 | } | |
512 | ||
513 | void smp_chan_destroy(struct l2cap_conn *conn) | |
514 | { | |
c8eb9690 BG |
515 | struct smp_chan *smp = conn->smp_chan; |
516 | ||
f1c09c07 | 517 | BUG_ON(!smp); |
c8eb9690 BG |
518 | |
519 | if (smp->tfm) | |
520 | crypto_free_blkcipher(smp->tfm); | |
521 | ||
522 | kfree(smp); | |
523 | conn->smp_chan = NULL; | |
2b64d153 | 524 | conn->hcon->smp_conn = NULL; |
76a68ba0 | 525 | hci_conn_drop(conn->hcon); |
8aab4757 VCG |
526 | } |
527 | ||
2b64d153 BG |
528 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
529 | { | |
530 | struct l2cap_conn *conn = hcon->smp_conn; | |
531 | struct smp_chan *smp; | |
532 | u32 value; | |
533 | u8 key[16]; | |
534 | ||
535 | BT_DBG(""); | |
536 | ||
537 | if (!conn) | |
538 | return -ENOTCONN; | |
539 | ||
540 | smp = conn->smp_chan; | |
541 | ||
542 | switch (mgmt_op) { | |
543 | case MGMT_OP_USER_PASSKEY_REPLY: | |
544 | value = le32_to_cpu(passkey); | |
545 | memset(key, 0, sizeof(key)); | |
546 | BT_DBG("PassKey: %d", value); | |
547 | put_unaligned_le32(value, key); | |
548 | swap128(key, smp->tk); | |
549 | /* Fall Through */ | |
550 | case MGMT_OP_USER_CONFIRM_REPLY: | |
551 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
552 | break; | |
553 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
554 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
555 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); | |
556 | return 0; | |
557 | default: | |
558 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); | |
559 | return -EOPNOTSUPP; | |
560 | } | |
561 | ||
562 | /* If it is our turn to send Pairing Confirm, do so now */ | |
563 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags)) | |
564 | queue_work(hcon->hdev->workqueue, &smp->confirm); | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
da85e5e5 | 569 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 570 | { |
3158c50c | 571 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
8aab4757 | 572 | struct smp_chan *smp; |
3158c50c | 573 | u8 key_size; |
2b64d153 | 574 | u8 auth = SMP_AUTH_NONE; |
8aab4757 | 575 | int ret; |
88ba43b6 AB |
576 | |
577 | BT_DBG("conn %p", conn); | |
578 | ||
2b64d153 BG |
579 | if (conn->hcon->link_mode & HCI_LM_MASTER) |
580 | return SMP_CMD_NOTSUPP; | |
581 | ||
51a8efd7 | 582 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
8aab4757 | 583 | smp = smp_chan_create(conn); |
d08fd0e7 AE |
584 | else |
585 | smp = conn->smp_chan; | |
8aab4757 | 586 | |
d08fd0e7 AE |
587 | if (!smp) |
588 | return SMP_UNSPECIFIED; | |
d26a2345 | 589 | |
1c1def09 VCG |
590 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
591 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 592 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 593 | |
2b64d153 BG |
594 | /* We didn't start the pairing, so match remote */ |
595 | if (req->auth_req & SMP_AUTH_BONDING) | |
596 | auth = req->auth_req; | |
da85e5e5 | 597 | |
fdde0a26 IY |
598 | conn->hcon->pending_sec_level = authreq_to_seclevel(auth); |
599 | ||
2b64d153 | 600 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
601 | |
602 | key_size = min(req->max_key_size, rsp.max_key_size); | |
603 | if (check_enc_key_size(conn, key_size)) | |
604 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 605 | |
8aab4757 VCG |
606 | ret = smp_rand(smp->prnd); |
607 | if (ret) | |
608 | return SMP_UNSPECIFIED; | |
609 | ||
1c1def09 VCG |
610 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
611 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 612 | |
3158c50c | 613 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 614 | |
2b64d153 BG |
615 | /* Request setup of TK */ |
616 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
617 | if (ret) | |
618 | return SMP_UNSPECIFIED; | |
619 | ||
da85e5e5 | 620 | return 0; |
88ba43b6 AB |
621 | } |
622 | ||
da85e5e5 | 623 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 624 | { |
3158c50c | 625 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
1c1def09 | 626 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 627 | struct hci_dev *hdev = conn->hcon->hdev; |
2b64d153 | 628 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 629 | int ret; |
88ba43b6 AB |
630 | |
631 | BT_DBG("conn %p", conn); | |
632 | ||
2b64d153 BG |
633 | if (!(conn->hcon->link_mode & HCI_LM_MASTER)) |
634 | return SMP_CMD_NOTSUPP; | |
635 | ||
3158c50c VCG |
636 | skb_pull(skb, sizeof(*rsp)); |
637 | ||
1c1def09 | 638 | req = (void *) &smp->preq[1]; |
da85e5e5 | 639 | |
3158c50c VCG |
640 | key_size = min(req->max_key_size, rsp->max_key_size); |
641 | if (check_enc_key_size(conn, key_size)) | |
642 | return SMP_ENC_KEY_SIZE; | |
643 | ||
1c1def09 | 644 | ret = smp_rand(smp->prnd); |
7d24ddcc | 645 | if (ret) |
da85e5e5 | 646 | return SMP_UNSPECIFIED; |
7d24ddcc | 647 | |
8aab4757 VCG |
648 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
649 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 650 | |
2b64d153 BG |
651 | if ((req->auth_req & SMP_AUTH_BONDING) && |
652 | (rsp->auth_req & SMP_AUTH_BONDING)) | |
653 | auth = SMP_AUTH_BONDING; | |
654 | ||
655 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
656 | ||
476585ec | 657 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
658 | if (ret) |
659 | return SMP_UNSPECIFIED; | |
660 | ||
661 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); | |
662 | ||
663 | /* Can't compose response until we have been confirmed */ | |
664 | if (!test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) | |
665 | return 0; | |
666 | ||
8aab4757 | 667 | queue_work(hdev->workqueue, &smp->confirm); |
da85e5e5 VCG |
668 | |
669 | return 0; | |
88ba43b6 AB |
670 | } |
671 | ||
da85e5e5 | 672 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 673 | { |
1c1def09 | 674 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 675 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 676 | |
88ba43b6 AB |
677 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
678 | ||
1c1def09 VCG |
679 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
680 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 681 | |
7d24ddcc AB |
682 | if (conn->hcon->out) { |
683 | u8 random[16]; | |
88ba43b6 | 684 | |
1c1def09 | 685 | swap128(smp->prnd, random); |
88ba43b6 | 686 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random), |
7d24ddcc | 687 | random); |
2b64d153 | 688 | } else if (test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) { |
8aab4757 | 689 | queue_work(hdev->workqueue, &smp->confirm); |
2b64d153 BG |
690 | } else { |
691 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); | |
88ba43b6 | 692 | } |
da85e5e5 VCG |
693 | |
694 | return 0; | |
88ba43b6 AB |
695 | } |
696 | ||
da85e5e5 | 697 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 698 | { |
1c1def09 | 699 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 700 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 701 | |
8aab4757 | 702 | BT_DBG("conn %p", conn); |
3158c50c | 703 | |
8aab4757 VCG |
704 | swap128(skb->data, smp->rrnd); |
705 | skb_pull(skb, sizeof(smp->rrnd)); | |
e7e62c85 | 706 | |
8aab4757 | 707 | queue_work(hdev->workqueue, &smp->random); |
da85e5e5 VCG |
708 | |
709 | return 0; | |
88ba43b6 AB |
710 | } |
711 | ||
4dab7864 | 712 | static u8 smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 713 | { |
c9839a11 | 714 | struct smp_ltk *key; |
988c5997 VCG |
715 | struct hci_conn *hcon = conn->hcon; |
716 | ||
c9839a11 | 717 | key = hci_find_ltk_by_addr(hcon->hdev, conn->dst, hcon->dst_type); |
988c5997 VCG |
718 | if (!key) |
719 | return 0; | |
720 | ||
4dab7864 JH |
721 | if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) |
722 | return 0; | |
723 | ||
51a8efd7 | 724 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
988c5997 VCG |
725 | return 1; |
726 | ||
c9839a11 VCG |
727 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
728 | hcon->enc_key_size = key->enc_size; | |
988c5997 VCG |
729 | |
730 | return 1; | |
731 | ||
732 | } | |
da85e5e5 | 733 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
734 | { |
735 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
736 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 737 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 738 | struct smp_chan *smp; |
88ba43b6 AB |
739 | |
740 | BT_DBG("conn %p", conn); | |
741 | ||
2b64d153 | 742 | hcon->pending_sec_level = authreq_to_seclevel(rp->auth_req); |
feb45eb5 | 743 | |
4dab7864 | 744 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
745 | return 0; |
746 | ||
51a8efd7 | 747 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
da85e5e5 | 748 | return 0; |
f1cb9af5 | 749 | |
8aab4757 | 750 | smp = smp_chan_create(conn); |
d26a2345 | 751 | |
88ba43b6 | 752 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 753 | |
da85e5e5 | 754 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 755 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 756 | |
1c1def09 VCG |
757 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
758 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 759 | |
88ba43b6 | 760 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 761 | |
da85e5e5 | 762 | return 0; |
88ba43b6 AB |
763 | } |
764 | ||
cc110922 | 765 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 766 | { |
cc110922 | 767 | struct l2cap_conn *conn = hcon->l2cap_data; |
1c1def09 | 768 | struct smp_chan *smp = conn->smp_chan; |
2b64d153 | 769 | __u8 authreq; |
eb492e01 | 770 | |
3a0259bb VCG |
771 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
772 | ||
757aee0f | 773 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
774 | return 1; |
775 | ||
f1cb9af5 VCG |
776 | if (sec_level == BT_SECURITY_LOW) |
777 | return 1; | |
eb492e01 | 778 | |
f1cb9af5 | 779 | if (hcon->sec_level >= sec_level) |
eb492e01 | 780 | return 1; |
f1cb9af5 | 781 | |
988c5997 | 782 | if (hcon->link_mode & HCI_LM_MASTER) |
4dab7864 | 783 | if (smp_ltk_encrypt(conn, sec_level)) |
02bc7455 | 784 | goto done; |
d26a2345 | 785 | |
51a8efd7 | 786 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
787 | return 0; |
788 | ||
8aab4757 | 789 | smp = smp_chan_create(conn); |
2b64d153 BG |
790 | if (!smp) |
791 | return 1; | |
792 | ||
793 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 794 | |
d26a2345 VCG |
795 | if (hcon->link_mode & HCI_LM_MASTER) { |
796 | struct smp_cmd_pairing cp; | |
f01ead31 | 797 | |
2b64d153 | 798 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
799 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
800 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 801 | |
eb492e01 AB |
802 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
803 | } else { | |
804 | struct smp_cmd_security_req cp; | |
2b64d153 | 805 | cp.auth_req = authreq; |
eb492e01 AB |
806 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
807 | } | |
808 | ||
02bc7455 | 809 | done: |
f1cb9af5 | 810 | hcon->pending_sec_level = sec_level; |
f1cb9af5 | 811 | |
eb492e01 AB |
812 | return 0; |
813 | } | |
814 | ||
7034b911 VCG |
815 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
816 | { | |
16b90839 | 817 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
1c1def09 | 818 | struct smp_chan *smp = conn->smp_chan; |
16b90839 VCG |
819 | |
820 | skb_pull(skb, sizeof(*rp)); | |
821 | ||
1c1def09 | 822 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 823 | |
7034b911 VCG |
824 | return 0; |
825 | } | |
826 | ||
827 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
828 | { | |
16b90839 | 829 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
1c1def09 | 830 | struct smp_chan *smp = conn->smp_chan; |
c9839a11 VCG |
831 | struct hci_dev *hdev = conn->hcon->hdev; |
832 | struct hci_conn *hcon = conn->hcon; | |
833 | u8 authenticated; | |
16b90839 VCG |
834 | |
835 | skb_pull(skb, sizeof(*rp)); | |
7034b911 | 836 | |
c9839a11 VCG |
837 | hci_dev_lock(hdev); |
838 | authenticated = (conn->hcon->sec_level == BT_SECURITY_HIGH); | |
839 | hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type, | |
04124681 GP |
840 | HCI_SMP_LTK, 1, authenticated, smp->tk, smp->enc_key_size, |
841 | rp->ediv, rp->rand); | |
7034b911 | 842 | smp_distribute_keys(conn, 1); |
c9839a11 | 843 | hci_dev_unlock(hdev); |
7034b911 VCG |
844 | |
845 | return 0; | |
846 | } | |
847 | ||
eb492e01 AB |
848 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
849 | { | |
850 | __u8 code = skb->data[0]; | |
851 | __u8 reason; | |
852 | int err = 0; | |
853 | ||
757aee0f | 854 | if (!test_bit(HCI_LE_ENABLED, &conn->hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
855 | err = -ENOTSUPP; |
856 | reason = SMP_PAIRING_NOTSUPP; | |
857 | goto done; | |
858 | } | |
859 | ||
eb492e01 AB |
860 | skb_pull(skb, sizeof(code)); |
861 | ||
8cf9fa12 JH |
862 | /* |
863 | * The SMP context must be initialized for all other PDUs except | |
864 | * pairing and security requests. If we get any other PDU when | |
865 | * not initialized simply disconnect (done if this function | |
866 | * returns an error). | |
867 | */ | |
868 | if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && | |
869 | !conn->smp_chan) { | |
870 | BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); | |
871 | kfree_skb(skb); | |
872 | return -ENOTSUPP; | |
873 | } | |
874 | ||
eb492e01 AB |
875 | switch (code) { |
876 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 877 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
878 | break; |
879 | ||
880 | case SMP_CMD_PAIRING_FAIL: | |
4f957a76 | 881 | smp_failure(conn, skb->data[0], 0); |
da85e5e5 VCG |
882 | reason = 0; |
883 | err = -EPERM; | |
eb492e01 AB |
884 | break; |
885 | ||
886 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 887 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
888 | break; |
889 | ||
890 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 891 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
892 | break; |
893 | ||
eb492e01 | 894 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 895 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
896 | break; |
897 | ||
eb492e01 | 898 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 899 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
900 | break; |
901 | ||
eb492e01 | 902 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
903 | reason = smp_cmd_encrypt_info(conn, skb); |
904 | break; | |
905 | ||
eb492e01 | 906 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
907 | reason = smp_cmd_master_ident(conn, skb); |
908 | break; | |
909 | ||
eb492e01 AB |
910 | case SMP_CMD_IDENT_INFO: |
911 | case SMP_CMD_IDENT_ADDR_INFO: | |
912 | case SMP_CMD_SIGN_INFO: | |
7034b911 VCG |
913 | /* Just ignored */ |
914 | reason = 0; | |
915 | break; | |
916 | ||
eb492e01 AB |
917 | default: |
918 | BT_DBG("Unknown command code 0x%2.2x", code); | |
919 | ||
920 | reason = SMP_CMD_NOTSUPP; | |
eb492e01 | 921 | err = -EOPNOTSUPP; |
3a0259bb | 922 | goto done; |
eb492e01 AB |
923 | } |
924 | ||
3a0259bb VCG |
925 | done: |
926 | if (reason) | |
4f957a76 | 927 | smp_failure(conn, reason, 1); |
3a0259bb | 928 | |
eb492e01 AB |
929 | kfree_skb(skb); |
930 | return err; | |
931 | } | |
7034b911 VCG |
932 | |
933 | int smp_distribute_keys(struct l2cap_conn *conn, __u8 force) | |
934 | { | |
935 | struct smp_cmd_pairing *req, *rsp; | |
1c1def09 | 936 | struct smp_chan *smp = conn->smp_chan; |
7034b911 VCG |
937 | __u8 *keydist; |
938 | ||
939 | BT_DBG("conn %p force %d", conn, force); | |
940 | ||
51a8efd7 | 941 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
d26a2345 VCG |
942 | return 0; |
943 | ||
1c1def09 | 944 | rsp = (void *) &smp->prsp[1]; |
7034b911 VCG |
945 | |
946 | /* The responder sends its keys first */ | |
947 | if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07)) | |
948 | return 0; | |
949 | ||
1c1def09 | 950 | req = (void *) &smp->preq[1]; |
7034b911 VCG |
951 | |
952 | if (conn->hcon->out) { | |
953 | keydist = &rsp->init_key_dist; | |
954 | *keydist &= req->init_key_dist; | |
955 | } else { | |
956 | keydist = &rsp->resp_key_dist; | |
957 | *keydist &= req->resp_key_dist; | |
958 | } | |
959 | ||
960 | ||
961 | BT_DBG("keydist 0x%x", *keydist); | |
962 | ||
963 | if (*keydist & SMP_DIST_ENC_KEY) { | |
964 | struct smp_cmd_encrypt_info enc; | |
965 | struct smp_cmd_master_ident ident; | |
c9839a11 VCG |
966 | struct hci_conn *hcon = conn->hcon; |
967 | u8 authenticated; | |
7034b911 VCG |
968 | __le16 ediv; |
969 | ||
970 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
971 | get_random_bytes(&ediv, sizeof(ediv)); | |
972 | get_random_bytes(ident.rand, sizeof(ident.rand)); | |
973 | ||
974 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
975 | ||
c9839a11 VCG |
976 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; |
977 | hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type, | |
04124681 GP |
978 | HCI_SMP_LTK_SLAVE, 1, authenticated, |
979 | enc.ltk, smp->enc_key_size, ediv, ident.rand); | |
16b90839 | 980 | |
58115373 | 981 | ident.ediv = ediv; |
7034b911 VCG |
982 | |
983 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
984 | ||
985 | *keydist &= ~SMP_DIST_ENC_KEY; | |
986 | } | |
987 | ||
988 | if (*keydist & SMP_DIST_ID_KEY) { | |
989 | struct smp_cmd_ident_addr_info addrinfo; | |
990 | struct smp_cmd_ident_info idinfo; | |
991 | ||
992 | /* Send a dummy key */ | |
993 | get_random_bytes(idinfo.irk, sizeof(idinfo.irk)); | |
994 | ||
995 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
996 | ||
997 | /* Just public address */ | |
998 | memset(&addrinfo, 0, sizeof(addrinfo)); | |
999 | bacpy(&addrinfo.bdaddr, conn->src); | |
1000 | ||
1001 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
1002 | &addrinfo); | |
1003 | ||
1004 | *keydist &= ~SMP_DIST_ID_KEY; | |
1005 | } | |
1006 | ||
1007 | if (*keydist & SMP_DIST_SIGN) { | |
1008 | struct smp_cmd_sign_info sign; | |
1009 | ||
1010 | /* Send a dummy key */ | |
1011 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
1012 | ||
1013 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
1014 | ||
1015 | *keydist &= ~SMP_DIST_SIGN; | |
1016 | } | |
1017 | ||
d26a2345 | 1018 | if (conn->hcon->out || force) { |
51a8efd7 | 1019 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); |
6c9d42a1 | 1020 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 1021 | smp_chan_destroy(conn); |
d26a2345 VCG |
1022 | } |
1023 | ||
7034b911 VCG |
1024 | return 0; |
1025 | } |