Commit | Line | Data |
---|---|---|
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 | ||
23 | #include <net/bluetooth/bluetooth.h> | |
24 | #include <net/bluetooth/hci_core.h> | |
25 | #include <net/bluetooth/l2cap.h> | |
26 | #include <net/bluetooth/smp.h> | |
d22ef0bc | 27 | #include <linux/crypto.h> |
f70490e6 | 28 | #include <linux/scatterlist.h> |
d22ef0bc AB |
29 | #include <crypto/b128ops.h> |
30 | ||
5d3de7df VCG |
31 | #define SMP_TIMEOUT 30000 /* 30 seconds */ |
32 | ||
d22ef0bc AB |
33 | static inline void swap128(u8 src[16], u8 dst[16]) |
34 | { | |
35 | int i; | |
36 | for (i = 0; i < 16; i++) | |
37 | dst[15 - i] = src[i]; | |
38 | } | |
39 | ||
40 | static inline void swap56(u8 src[7], u8 dst[7]) | |
41 | { | |
42 | int i; | |
43 | for (i = 0; i < 7; i++) | |
44 | dst[6 - i] = src[i]; | |
45 | } | |
46 | ||
47 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
48 | { | |
49 | struct blkcipher_desc desc; | |
50 | struct scatterlist sg; | |
51 | int err, iv_len; | |
52 | unsigned char iv[128]; | |
53 | ||
54 | if (tfm == NULL) { | |
55 | BT_ERR("tfm %p", tfm); | |
56 | return -EINVAL; | |
57 | } | |
58 | ||
59 | desc.tfm = tfm; | |
60 | desc.flags = 0; | |
61 | ||
62 | err = crypto_blkcipher_setkey(tfm, k, 16); | |
63 | if (err) { | |
64 | BT_ERR("cipher setkey failed: %d", err); | |
65 | return err; | |
66 | } | |
67 | ||
68 | sg_init_one(&sg, r, 16); | |
69 | ||
70 | iv_len = crypto_blkcipher_ivsize(tfm); | |
71 | if (iv_len) { | |
72 | memset(&iv, 0xff, iv_len); | |
73 | crypto_blkcipher_set_iv(tfm, iv, iv_len); | |
74 | } | |
75 | ||
76 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); | |
77 | if (err) | |
78 | BT_ERR("Encrypt data error %d", err); | |
79 | ||
80 | return err; | |
81 | } | |
82 | ||
83 | static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16], | |
84 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, | |
85 | u8 _rat, bdaddr_t *ra, u8 res[16]) | |
86 | { | |
87 | u8 p1[16], p2[16]; | |
88 | int err; | |
89 | ||
90 | memset(p1, 0, 16); | |
91 | ||
92 | /* p1 = pres || preq || _rat || _iat */ | |
93 | swap56(pres, p1); | |
94 | swap56(preq, p1 + 7); | |
95 | p1[14] = _rat; | |
96 | p1[15] = _iat; | |
97 | ||
98 | memset(p2, 0, 16); | |
99 | ||
100 | /* p2 = padding || ia || ra */ | |
101 | baswap((bdaddr_t *) (p2 + 4), ia); | |
102 | baswap((bdaddr_t *) (p2 + 10), ra); | |
103 | ||
104 | /* res = r XOR p1 */ | |
105 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
106 | ||
107 | /* res = e(k, res) */ | |
108 | err = smp_e(tfm, k, res); | |
109 | if (err) { | |
110 | BT_ERR("Encrypt data error"); | |
111 | return err; | |
112 | } | |
113 | ||
114 | /* res = res XOR p2 */ | |
115 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
116 | ||
117 | /* res = e(k, res) */ | |
118 | err = smp_e(tfm, k, res); | |
119 | if (err) | |
120 | BT_ERR("Encrypt data error"); | |
121 | ||
122 | return err; | |
123 | } | |
124 | ||
125 | static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16], | |
126 | u8 r1[16], u8 r2[16], u8 _r[16]) | |
127 | { | |
128 | int err; | |
129 | ||
130 | /* Just least significant octets from r1 and r2 are considered */ | |
131 | memcpy(_r, r1 + 8, 8); | |
132 | memcpy(_r + 8, r2 + 8, 8); | |
133 | ||
134 | err = smp_e(tfm, k, _r); | |
135 | if (err) | |
136 | BT_ERR("Encrypt data error"); | |
137 | ||
138 | return err; | |
139 | } | |
140 | ||
141 | static int smp_rand(u8 *buf) | |
142 | { | |
143 | get_random_bytes(buf, 16); | |
144 | ||
145 | return 0; | |
146 | } | |
eb492e01 AB |
147 | |
148 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, | |
149 | u16 dlen, void *data) | |
150 | { | |
151 | struct sk_buff *skb; | |
152 | struct l2cap_hdr *lh; | |
153 | int len; | |
154 | ||
155 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; | |
156 | ||
157 | if (len > conn->mtu) | |
158 | return NULL; | |
159 | ||
160 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
161 | if (!skb) | |
162 | return NULL; | |
163 | ||
164 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
165 | lh->len = cpu_to_le16(sizeof(code) + dlen); | |
166 | lh->cid = cpu_to_le16(L2CAP_CID_SMP); | |
167 | ||
168 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); | |
169 | ||
170 | memcpy(skb_put(skb, dlen), data, dlen); | |
171 | ||
172 | return skb; | |
173 | } | |
174 | ||
175 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) | |
176 | { | |
177 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); | |
178 | ||
179 | BT_DBG("code 0x%2.2x", code); | |
180 | ||
181 | if (!skb) | |
182 | return; | |
183 | ||
73d80deb LAD |
184 | skb->priority = HCI_PRIO_MAX; |
185 | hci_send_acl(conn->hchan, skb, 0); | |
e2dcd113 | 186 | |
6c9d42a1 GP |
187 | cancel_delayed_work_sync(&conn->security_timer); |
188 | schedule_delayed_work(&conn->security_timer, | |
e2dcd113 | 189 | msecs_to_jiffies(SMP_TIMEOUT)); |
eb492e01 AB |
190 | } |
191 | ||
b8e66eac | 192 | static void build_pairing_cmd(struct l2cap_conn *conn, |
54790f73 VCG |
193 | struct smp_cmd_pairing *req, |
194 | struct smp_cmd_pairing *rsp, | |
195 | __u8 authreq) | |
b8e66eac | 196 | { |
54790f73 VCG |
197 | u8 dist_keys; |
198 | ||
199 | dist_keys = 0; | |
200 | if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->flags)) { | |
ca10b5ee | 201 | dist_keys = SMP_DIST_ENC_KEY; |
54790f73 VCG |
202 | authreq |= SMP_AUTH_BONDING; |
203 | } | |
204 | ||
205 | if (rsp == NULL) { | |
206 | req->io_capability = conn->hcon->io_capability; | |
207 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
208 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
209 | req->init_key_dist = dist_keys; | |
210 | req->resp_key_dist = dist_keys; | |
211 | req->auth_req = authreq; | |
212 | return; | |
213 | } | |
214 | ||
215 | rsp->io_capability = conn->hcon->io_capability; | |
216 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
217 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
218 | rsp->init_key_dist = req->init_key_dist & dist_keys; | |
219 | rsp->resp_key_dist = req->resp_key_dist & dist_keys; | |
220 | rsp->auth_req = authreq; | |
b8e66eac VCG |
221 | } |
222 | ||
3158c50c VCG |
223 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
224 | { | |
1c1def09 VCG |
225 | struct smp_chan *smp = conn->smp_chan; |
226 | ||
3158c50c VCG |
227 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
228 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) | |
229 | return SMP_ENC_KEY_SIZE; | |
230 | ||
1c1def09 | 231 | smp->smp_key_size = max_key_size; |
3158c50c VCG |
232 | |
233 | return 0; | |
234 | } | |
235 | ||
4f957a76 BG |
236 | static void smp_failure(struct l2cap_conn *conn, u8 reason, u8 send) |
237 | { | |
238 | if (send) | |
239 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), | |
240 | &reason); | |
241 | ||
242 | clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->hcon->pend); | |
243 | mgmt_auth_failed(conn->hcon->hdev, conn->dst, reason); | |
6c9d42a1 | 244 | cancel_delayed_work_sync(&conn->security_timer); |
4f957a76 BG |
245 | smp_chan_destroy(conn); |
246 | } | |
247 | ||
8aab4757 VCG |
248 | static void confirm_work(struct work_struct *work) |
249 | { | |
250 | struct smp_chan *smp = container_of(work, struct smp_chan, confirm); | |
251 | struct l2cap_conn *conn = smp->conn; | |
252 | struct crypto_blkcipher *tfm; | |
253 | struct smp_cmd_pairing_confirm cp; | |
254 | int ret; | |
255 | u8 res[16], reason; | |
256 | ||
257 | BT_DBG("conn %p", conn); | |
258 | ||
259 | tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); | |
260 | if (IS_ERR(tfm)) { | |
261 | reason = SMP_UNSPECIFIED; | |
262 | goto error; | |
263 | } | |
264 | ||
265 | smp->tfm = tfm; | |
266 | ||
267 | if (conn->hcon->out) | |
268 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0, | |
269 | conn->src, conn->hcon->dst_type, conn->dst, | |
270 | res); | |
271 | else | |
272 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, | |
273 | conn->hcon->dst_type, conn->dst, 0, conn->src, | |
274 | res); | |
275 | if (ret) { | |
276 | reason = SMP_UNSPECIFIED; | |
277 | goto error; | |
278 | } | |
279 | ||
280 | swap128(res, cp.confirm_val); | |
281 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); | |
282 | ||
283 | return; | |
284 | ||
285 | error: | |
4f957a76 | 286 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
287 | } |
288 | ||
289 | static void random_work(struct work_struct *work) | |
290 | { | |
291 | struct smp_chan *smp = container_of(work, struct smp_chan, random); | |
292 | struct l2cap_conn *conn = smp->conn; | |
293 | struct hci_conn *hcon = conn->hcon; | |
294 | struct crypto_blkcipher *tfm = smp->tfm; | |
295 | u8 reason, confirm[16], res[16], key[16]; | |
296 | int ret; | |
297 | ||
298 | if (IS_ERR_OR_NULL(tfm)) { | |
299 | reason = SMP_UNSPECIFIED; | |
300 | goto error; | |
301 | } | |
302 | ||
303 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
304 | ||
305 | if (hcon->out) | |
306 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0, | |
307 | conn->src, hcon->dst_type, conn->dst, | |
308 | res); | |
309 | else | |
310 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, | |
311 | hcon->dst_type, conn->dst, 0, conn->src, | |
312 | res); | |
313 | if (ret) { | |
314 | reason = SMP_UNSPECIFIED; | |
315 | goto error; | |
316 | } | |
317 | ||
318 | swap128(res, confirm); | |
319 | ||
320 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { | |
321 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
322 | reason = SMP_CONFIRM_FAILED; | |
323 | goto error; | |
324 | } | |
325 | ||
326 | if (hcon->out) { | |
327 | u8 stk[16], rand[8]; | |
328 | __le16 ediv; | |
329 | ||
330 | memset(rand, 0, sizeof(rand)); | |
331 | ediv = 0; | |
332 | ||
333 | smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key); | |
334 | swap128(key, stk); | |
335 | ||
336 | memset(stk + smp->smp_key_size, 0, | |
337 | SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size); | |
338 | ||
339 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend)) { | |
340 | reason = SMP_UNSPECIFIED; | |
341 | goto error; | |
342 | } | |
343 | ||
344 | hci_le_start_enc(hcon, ediv, rand, stk); | |
345 | hcon->enc_key_size = smp->smp_key_size; | |
346 | } else { | |
347 | u8 stk[16], r[16], rand[8]; | |
348 | __le16 ediv; | |
349 | ||
350 | memset(rand, 0, sizeof(rand)); | |
351 | ediv = 0; | |
352 | ||
353 | swap128(smp->prnd, r); | |
354 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r); | |
355 | ||
356 | smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key); | |
357 | swap128(key, stk); | |
358 | ||
359 | memset(stk + smp->smp_key_size, 0, | |
360 | SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size); | |
361 | ||
362 | hci_add_ltk(hcon->hdev, 0, conn->dst, smp->smp_key_size, | |
363 | ediv, rand, stk); | |
364 | } | |
365 | ||
366 | return; | |
367 | ||
368 | error: | |
4f957a76 | 369 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
370 | } |
371 | ||
372 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) | |
373 | { | |
374 | struct smp_chan *smp; | |
375 | ||
376 | smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC); | |
377 | if (!smp) | |
378 | return NULL; | |
379 | ||
380 | INIT_WORK(&smp->confirm, confirm_work); | |
381 | INIT_WORK(&smp->random, random_work); | |
382 | ||
383 | smp->conn = conn; | |
384 | conn->smp_chan = smp; | |
385 | ||
386 | hci_conn_hold(conn->hcon); | |
387 | ||
388 | return smp; | |
389 | } | |
390 | ||
391 | void smp_chan_destroy(struct l2cap_conn *conn) | |
392 | { | |
c8eb9690 BG |
393 | struct smp_chan *smp = conn->smp_chan; |
394 | ||
395 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend); | |
396 | ||
397 | if (smp->tfm) | |
398 | crypto_free_blkcipher(smp->tfm); | |
399 | ||
400 | kfree(smp); | |
401 | conn->smp_chan = NULL; | |
8aab4757 VCG |
402 | hci_conn_put(conn->hcon); |
403 | } | |
404 | ||
da85e5e5 | 405 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 406 | { |
3158c50c | 407 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
8aab4757 | 408 | struct smp_chan *smp; |
3158c50c | 409 | u8 key_size; |
8aab4757 | 410 | int ret; |
88ba43b6 AB |
411 | |
412 | BT_DBG("conn %p", conn); | |
413 | ||
d26a2345 | 414 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend)) |
8aab4757 VCG |
415 | smp = smp_chan_create(conn); |
416 | ||
417 | smp = conn->smp_chan; | |
d26a2345 | 418 | |
1c1def09 VCG |
419 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
420 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 421 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 422 | |
3158c50c | 423 | if (req->oob_flag) |
da85e5e5 VCG |
424 | return SMP_OOB_NOT_AVAIL; |
425 | ||
426 | /* We didn't start the pairing, so no requirements */ | |
54790f73 | 427 | build_pairing_cmd(conn, req, &rsp, SMP_AUTH_NONE); |
3158c50c VCG |
428 | |
429 | key_size = min(req->max_key_size, rsp.max_key_size); | |
430 | if (check_enc_key_size(conn, key_size)) | |
431 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 432 | |
7d24ddcc | 433 | /* Just works */ |
1c1def09 | 434 | memset(smp->tk, 0, sizeof(smp->tk)); |
7d24ddcc | 435 | |
8aab4757 VCG |
436 | ret = smp_rand(smp->prnd); |
437 | if (ret) | |
438 | return SMP_UNSPECIFIED; | |
439 | ||
1c1def09 VCG |
440 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
441 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 442 | |
3158c50c | 443 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 VCG |
444 | |
445 | return 0; | |
88ba43b6 AB |
446 | } |
447 | ||
da85e5e5 | 448 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 449 | { |
3158c50c | 450 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
1c1def09 | 451 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 VCG |
452 | struct hci_dev *hdev = conn->hcon->hdev; |
453 | u8 key_size; | |
7d24ddcc | 454 | int ret; |
88ba43b6 AB |
455 | |
456 | BT_DBG("conn %p", conn); | |
457 | ||
3158c50c VCG |
458 | skb_pull(skb, sizeof(*rsp)); |
459 | ||
1c1def09 | 460 | req = (void *) &smp->preq[1]; |
da85e5e5 | 461 | |
3158c50c VCG |
462 | key_size = min(req->max_key_size, rsp->max_key_size); |
463 | if (check_enc_key_size(conn, key_size)) | |
464 | return SMP_ENC_KEY_SIZE; | |
465 | ||
466 | if (rsp->oob_flag) | |
da85e5e5 VCG |
467 | return SMP_OOB_NOT_AVAIL; |
468 | ||
7d24ddcc | 469 | /* Just works */ |
1c1def09 | 470 | memset(smp->tk, 0, sizeof(smp->tk)); |
88ba43b6 | 471 | |
1c1def09 | 472 | ret = smp_rand(smp->prnd); |
7d24ddcc | 473 | if (ret) |
da85e5e5 | 474 | return SMP_UNSPECIFIED; |
7d24ddcc | 475 | |
8aab4757 VCG |
476 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
477 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 478 | |
8aab4757 | 479 | queue_work(hdev->workqueue, &smp->confirm); |
da85e5e5 VCG |
480 | |
481 | return 0; | |
88ba43b6 AB |
482 | } |
483 | ||
da85e5e5 | 484 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 485 | { |
1c1def09 | 486 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 487 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 488 | |
88ba43b6 AB |
489 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
490 | ||
1c1def09 VCG |
491 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
492 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 493 | |
7d24ddcc AB |
494 | if (conn->hcon->out) { |
495 | u8 random[16]; | |
88ba43b6 | 496 | |
1c1def09 | 497 | swap128(smp->prnd, random); |
88ba43b6 | 498 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random), |
7d24ddcc | 499 | random); |
88ba43b6 | 500 | } else { |
8aab4757 | 501 | queue_work(hdev->workqueue, &smp->confirm); |
88ba43b6 | 502 | } |
da85e5e5 VCG |
503 | |
504 | return 0; | |
88ba43b6 AB |
505 | } |
506 | ||
da85e5e5 | 507 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 508 | { |
1c1def09 | 509 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 510 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 511 | |
8aab4757 | 512 | BT_DBG("conn %p", conn); |
3158c50c | 513 | |
8aab4757 VCG |
514 | swap128(skb->data, smp->rrnd); |
515 | skb_pull(skb, sizeof(smp->rrnd)); | |
e7e62c85 | 516 | |
8aab4757 | 517 | queue_work(hdev->workqueue, &smp->random); |
da85e5e5 VCG |
518 | |
519 | return 0; | |
88ba43b6 AB |
520 | } |
521 | ||
988c5997 VCG |
522 | static u8 smp_ltk_encrypt(struct l2cap_conn *conn) |
523 | { | |
524 | struct link_key *key; | |
525 | struct key_master_id *master; | |
526 | struct hci_conn *hcon = conn->hcon; | |
527 | ||
528 | key = hci_find_link_key_type(hcon->hdev, conn->dst, | |
529 | HCI_LK_SMP_LTK); | |
530 | if (!key) | |
531 | return 0; | |
532 | ||
533 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, | |
534 | &hcon->pend)) | |
535 | return 1; | |
536 | ||
537 | master = (void *) key->data; | |
538 | hci_le_start_enc(hcon, master->ediv, master->rand, | |
539 | key->val); | |
540 | hcon->enc_key_size = key->pin_len; | |
541 | ||
542 | return 1; | |
543 | ||
544 | } | |
da85e5e5 | 545 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
546 | { |
547 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
548 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 549 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 550 | struct smp_chan *smp; |
88ba43b6 AB |
551 | |
552 | BT_DBG("conn %p", conn); | |
553 | ||
feb45eb5 VCG |
554 | hcon->pending_sec_level = BT_SECURITY_MEDIUM; |
555 | ||
988c5997 VCG |
556 | if (smp_ltk_encrypt(conn)) |
557 | return 0; | |
558 | ||
d26a2345 | 559 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) |
da85e5e5 | 560 | return 0; |
f1cb9af5 | 561 | |
8aab4757 | 562 | smp = smp_chan_create(conn); |
d26a2345 | 563 | |
88ba43b6 | 564 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 565 | |
da85e5e5 | 566 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 567 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 568 | |
1c1def09 VCG |
569 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
570 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 571 | |
88ba43b6 | 572 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 573 | |
da85e5e5 | 574 | return 0; |
88ba43b6 AB |
575 | } |
576 | ||
eb492e01 AB |
577 | int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) |
578 | { | |
3a0259bb | 579 | struct hci_conn *hcon = conn->hcon; |
1c1def09 | 580 | struct smp_chan *smp = conn->smp_chan; |
eb492e01 | 581 | |
3a0259bb VCG |
582 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
583 | ||
2e65c9d2 AG |
584 | if (!lmp_host_le_capable(hcon->hdev)) |
585 | return 1; | |
586 | ||
f1cb9af5 VCG |
587 | if (sec_level == BT_SECURITY_LOW) |
588 | return 1; | |
eb492e01 | 589 | |
f1cb9af5 | 590 | if (hcon->sec_level >= sec_level) |
eb492e01 | 591 | return 1; |
f1cb9af5 | 592 | |
988c5997 VCG |
593 | if (hcon->link_mode & HCI_LM_MASTER) |
594 | if (smp_ltk_encrypt(conn)) | |
02bc7455 | 595 | goto done; |
d26a2345 VCG |
596 | |
597 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) | |
598 | return 0; | |
599 | ||
8aab4757 | 600 | smp = smp_chan_create(conn); |
d26a2345 | 601 | |
d26a2345 VCG |
602 | if (hcon->link_mode & HCI_LM_MASTER) { |
603 | struct smp_cmd_pairing cp; | |
f01ead31 | 604 | |
0fb4eb6f | 605 | build_pairing_cmd(conn, &cp, NULL, SMP_AUTH_NONE); |
1c1def09 VCG |
606 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
607 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 608 | |
eb492e01 AB |
609 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
610 | } else { | |
611 | struct smp_cmd_security_req cp; | |
0fb4eb6f | 612 | cp.auth_req = SMP_AUTH_NONE; |
eb492e01 AB |
613 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
614 | } | |
615 | ||
02bc7455 | 616 | done: |
f1cb9af5 | 617 | hcon->pending_sec_level = sec_level; |
f1cb9af5 | 618 | |
eb492e01 AB |
619 | return 0; |
620 | } | |
621 | ||
7034b911 VCG |
622 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
623 | { | |
16b90839 | 624 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
1c1def09 | 625 | struct smp_chan *smp = conn->smp_chan; |
16b90839 VCG |
626 | |
627 | skb_pull(skb, sizeof(*rp)); | |
628 | ||
1c1def09 | 629 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 630 | |
7034b911 VCG |
631 | return 0; |
632 | } | |
633 | ||
634 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
635 | { | |
16b90839 | 636 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
1c1def09 | 637 | struct smp_chan *smp = conn->smp_chan; |
16b90839 VCG |
638 | |
639 | skb_pull(skb, sizeof(*rp)); | |
7034b911 | 640 | |
1c1def09 VCG |
641 | hci_add_ltk(conn->hcon->hdev, 1, conn->src, smp->smp_key_size, |
642 | rp->ediv, rp->rand, smp->tk); | |
7034b911 VCG |
643 | |
644 | smp_distribute_keys(conn, 1); | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
eb492e01 AB |
649 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
650 | { | |
651 | __u8 code = skb->data[0]; | |
652 | __u8 reason; | |
653 | int err = 0; | |
654 | ||
2e65c9d2 AG |
655 | if (!lmp_host_le_capable(conn->hcon->hdev)) { |
656 | err = -ENOTSUPP; | |
657 | reason = SMP_PAIRING_NOTSUPP; | |
658 | goto done; | |
659 | } | |
660 | ||
eb492e01 AB |
661 | skb_pull(skb, sizeof(code)); |
662 | ||
663 | switch (code) { | |
664 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 665 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
666 | break; |
667 | ||
668 | case SMP_CMD_PAIRING_FAIL: | |
4f957a76 | 669 | smp_failure(conn, skb->data[0], 0); |
da85e5e5 VCG |
670 | reason = 0; |
671 | err = -EPERM; | |
eb492e01 AB |
672 | break; |
673 | ||
674 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 675 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
676 | break; |
677 | ||
678 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 679 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
680 | break; |
681 | ||
eb492e01 | 682 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 683 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
684 | break; |
685 | ||
eb492e01 | 686 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 687 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
688 | break; |
689 | ||
eb492e01 | 690 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
691 | reason = smp_cmd_encrypt_info(conn, skb); |
692 | break; | |
693 | ||
eb492e01 | 694 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
695 | reason = smp_cmd_master_ident(conn, skb); |
696 | break; | |
697 | ||
eb492e01 AB |
698 | case SMP_CMD_IDENT_INFO: |
699 | case SMP_CMD_IDENT_ADDR_INFO: | |
700 | case SMP_CMD_SIGN_INFO: | |
7034b911 VCG |
701 | /* Just ignored */ |
702 | reason = 0; | |
703 | break; | |
704 | ||
eb492e01 AB |
705 | default: |
706 | BT_DBG("Unknown command code 0x%2.2x", code); | |
707 | ||
708 | reason = SMP_CMD_NOTSUPP; | |
eb492e01 | 709 | err = -EOPNOTSUPP; |
3a0259bb | 710 | goto done; |
eb492e01 AB |
711 | } |
712 | ||
3a0259bb VCG |
713 | done: |
714 | if (reason) | |
4f957a76 | 715 | smp_failure(conn, reason, 1); |
3a0259bb | 716 | |
eb492e01 AB |
717 | kfree_skb(skb); |
718 | return err; | |
719 | } | |
7034b911 VCG |
720 | |
721 | int smp_distribute_keys(struct l2cap_conn *conn, __u8 force) | |
722 | { | |
723 | struct smp_cmd_pairing *req, *rsp; | |
1c1def09 | 724 | struct smp_chan *smp = conn->smp_chan; |
7034b911 VCG |
725 | __u8 *keydist; |
726 | ||
727 | BT_DBG("conn %p force %d", conn, force); | |
728 | ||
d26a2345 VCG |
729 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend)) |
730 | return 0; | |
731 | ||
1c1def09 | 732 | rsp = (void *) &smp->prsp[1]; |
7034b911 VCG |
733 | |
734 | /* The responder sends its keys first */ | |
735 | if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07)) | |
736 | return 0; | |
737 | ||
1c1def09 | 738 | req = (void *) &smp->preq[1]; |
7034b911 VCG |
739 | |
740 | if (conn->hcon->out) { | |
741 | keydist = &rsp->init_key_dist; | |
742 | *keydist &= req->init_key_dist; | |
743 | } else { | |
744 | keydist = &rsp->resp_key_dist; | |
745 | *keydist &= req->resp_key_dist; | |
746 | } | |
747 | ||
748 | ||
749 | BT_DBG("keydist 0x%x", *keydist); | |
750 | ||
751 | if (*keydist & SMP_DIST_ENC_KEY) { | |
752 | struct smp_cmd_encrypt_info enc; | |
753 | struct smp_cmd_master_ident ident; | |
754 | __le16 ediv; | |
755 | ||
756 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
757 | get_random_bytes(&ediv, sizeof(ediv)); | |
758 | get_random_bytes(ident.rand, sizeof(ident.rand)); | |
759 | ||
760 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
761 | ||
1c1def09 | 762 | hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size, |
726b4ffc | 763 | ediv, ident.rand, enc.ltk); |
16b90839 | 764 | |
7034b911 VCG |
765 | ident.ediv = cpu_to_le16(ediv); |
766 | ||
767 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
768 | ||
769 | *keydist &= ~SMP_DIST_ENC_KEY; | |
770 | } | |
771 | ||
772 | if (*keydist & SMP_DIST_ID_KEY) { | |
773 | struct smp_cmd_ident_addr_info addrinfo; | |
774 | struct smp_cmd_ident_info idinfo; | |
775 | ||
776 | /* Send a dummy key */ | |
777 | get_random_bytes(idinfo.irk, sizeof(idinfo.irk)); | |
778 | ||
779 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
780 | ||
781 | /* Just public address */ | |
782 | memset(&addrinfo, 0, sizeof(addrinfo)); | |
783 | bacpy(&addrinfo.bdaddr, conn->src); | |
784 | ||
785 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
786 | &addrinfo); | |
787 | ||
788 | *keydist &= ~SMP_DIST_ID_KEY; | |
789 | } | |
790 | ||
791 | if (*keydist & SMP_DIST_SIGN) { | |
792 | struct smp_cmd_sign_info sign; | |
793 | ||
794 | /* Send a dummy key */ | |
795 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
796 | ||
797 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
798 | ||
799 | *keydist &= ~SMP_DIST_SIGN; | |
800 | } | |
801 | ||
d26a2345 VCG |
802 | if (conn->hcon->out || force) { |
803 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend); | |
6c9d42a1 | 804 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 805 | smp_chan_destroy(conn); |
d26a2345 VCG |
806 | } |
807 | ||
7034b911 VCG |
808 | return 0; |
809 | } |