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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 | ||
23 | #include <net/bluetooth/bluetooth.h> | |
24 | #include <net/bluetooth/hci_core.h> | |
25 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 26 | #include <net/bluetooth/mgmt.h> |
eb492e01 | 27 | #include <net/bluetooth/smp.h> |
d22ef0bc | 28 | #include <linux/crypto.h> |
f70490e6 | 29 | #include <linux/scatterlist.h> |
d22ef0bc AB |
30 | #include <crypto/b128ops.h> |
31 | ||
5d3de7df VCG |
32 | #define SMP_TIMEOUT 30000 /* 30 seconds */ |
33 | ||
d22ef0bc AB |
34 | static inline void swap128(u8 src[16], u8 dst[16]) |
35 | { | |
36 | int i; | |
37 | for (i = 0; i < 16; i++) | |
38 | dst[15 - i] = src[i]; | |
39 | } | |
40 | ||
41 | static inline void swap56(u8 src[7], u8 dst[7]) | |
42 | { | |
43 | int i; | |
44 | for (i = 0; i < 7; i++) | |
45 | dst[6 - i] = src[i]; | |
46 | } | |
47 | ||
48 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
49 | { | |
50 | struct blkcipher_desc desc; | |
51 | struct scatterlist sg; | |
52 | int err, iv_len; | |
53 | unsigned char iv[128]; | |
54 | ||
55 | if (tfm == NULL) { | |
56 | BT_ERR("tfm %p", tfm); | |
57 | return -EINVAL; | |
58 | } | |
59 | ||
60 | desc.tfm = tfm; | |
61 | desc.flags = 0; | |
62 | ||
63 | err = crypto_blkcipher_setkey(tfm, k, 16); | |
64 | if (err) { | |
65 | BT_ERR("cipher setkey failed: %d", err); | |
66 | return err; | |
67 | } | |
68 | ||
69 | sg_init_one(&sg, r, 16); | |
70 | ||
71 | iv_len = crypto_blkcipher_ivsize(tfm); | |
72 | if (iv_len) { | |
73 | memset(&iv, 0xff, iv_len); | |
74 | crypto_blkcipher_set_iv(tfm, iv, iv_len); | |
75 | } | |
76 | ||
77 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); | |
78 | if (err) | |
79 | BT_ERR("Encrypt data error %d", err); | |
80 | ||
81 | return err; | |
82 | } | |
83 | ||
84 | static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16], | |
85 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, | |
86 | u8 _rat, bdaddr_t *ra, u8 res[16]) | |
87 | { | |
88 | u8 p1[16], p2[16]; | |
89 | int err; | |
90 | ||
91 | memset(p1, 0, 16); | |
92 | ||
93 | /* p1 = pres || preq || _rat || _iat */ | |
94 | swap56(pres, p1); | |
95 | swap56(preq, p1 + 7); | |
96 | p1[14] = _rat; | |
97 | p1[15] = _iat; | |
98 | ||
99 | memset(p2, 0, 16); | |
100 | ||
101 | /* p2 = padding || ia || ra */ | |
102 | baswap((bdaddr_t *) (p2 + 4), ia); | |
103 | baswap((bdaddr_t *) (p2 + 10), ra); | |
104 | ||
105 | /* res = r XOR p1 */ | |
106 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
107 | ||
108 | /* res = e(k, res) */ | |
109 | err = smp_e(tfm, k, res); | |
110 | if (err) { | |
111 | BT_ERR("Encrypt data error"); | |
112 | return err; | |
113 | } | |
114 | ||
115 | /* res = res XOR p2 */ | |
116 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
117 | ||
118 | /* res = e(k, res) */ | |
119 | err = smp_e(tfm, k, res); | |
120 | if (err) | |
121 | BT_ERR("Encrypt data error"); | |
122 | ||
123 | return err; | |
124 | } | |
125 | ||
126 | static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16], | |
127 | u8 r1[16], u8 r2[16], u8 _r[16]) | |
128 | { | |
129 | int err; | |
130 | ||
131 | /* Just least significant octets from r1 and r2 are considered */ | |
132 | memcpy(_r, r1 + 8, 8); | |
133 | memcpy(_r + 8, r2 + 8, 8); | |
134 | ||
135 | err = smp_e(tfm, k, _r); | |
136 | if (err) | |
137 | BT_ERR("Encrypt data error"); | |
138 | ||
139 | return err; | |
140 | } | |
141 | ||
142 | static int smp_rand(u8 *buf) | |
143 | { | |
144 | get_random_bytes(buf, 16); | |
145 | ||
146 | return 0; | |
147 | } | |
eb492e01 AB |
148 | |
149 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, | |
150 | u16 dlen, void *data) | |
151 | { | |
152 | struct sk_buff *skb; | |
153 | struct l2cap_hdr *lh; | |
154 | int len; | |
155 | ||
156 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; | |
157 | ||
158 | if (len > conn->mtu) | |
159 | return NULL; | |
160 | ||
161 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
162 | if (!skb) | |
163 | return NULL; | |
164 | ||
165 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
166 | lh->len = cpu_to_le16(sizeof(code) + dlen); | |
167 | lh->cid = cpu_to_le16(L2CAP_CID_SMP); | |
168 | ||
169 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); | |
170 | ||
171 | memcpy(skb_put(skb, dlen), data, dlen); | |
172 | ||
173 | return skb; | |
174 | } | |
175 | ||
176 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) | |
177 | { | |
178 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); | |
179 | ||
180 | BT_DBG("code 0x%2.2x", code); | |
181 | ||
182 | if (!skb) | |
183 | return; | |
184 | ||
73d80deb LAD |
185 | skb->priority = HCI_PRIO_MAX; |
186 | hci_send_acl(conn->hchan, skb, 0); | |
e2dcd113 | 187 | |
6c9d42a1 GP |
188 | cancel_delayed_work_sync(&conn->security_timer); |
189 | schedule_delayed_work(&conn->security_timer, | |
e2dcd113 | 190 | msecs_to_jiffies(SMP_TIMEOUT)); |
eb492e01 AB |
191 | } |
192 | ||
2b64d153 BG |
193 | static __u8 authreq_to_seclevel(__u8 authreq) |
194 | { | |
195 | if (authreq & SMP_AUTH_MITM) | |
196 | return BT_SECURITY_HIGH; | |
197 | else | |
198 | return BT_SECURITY_MEDIUM; | |
199 | } | |
200 | ||
201 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
202 | { | |
203 | switch (sec_level) { | |
204 | case BT_SECURITY_HIGH: | |
205 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
206 | case BT_SECURITY_MEDIUM: | |
207 | return SMP_AUTH_BONDING; | |
208 | default: | |
209 | return SMP_AUTH_NONE; | |
210 | } | |
211 | } | |
212 | ||
b8e66eac | 213 | static void build_pairing_cmd(struct l2cap_conn *conn, |
54790f73 VCG |
214 | struct smp_cmd_pairing *req, |
215 | struct smp_cmd_pairing *rsp, | |
216 | __u8 authreq) | |
b8e66eac | 217 | { |
2b64d153 | 218 | u8 dist_keys = 0; |
54790f73 | 219 | |
54790f73 | 220 | if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->flags)) { |
ca10b5ee | 221 | dist_keys = SMP_DIST_ENC_KEY; |
54790f73 | 222 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
223 | } else { |
224 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
225 | } |
226 | ||
227 | if (rsp == NULL) { | |
228 | req->io_capability = conn->hcon->io_capability; | |
229 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
230 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
2b64d153 | 231 | req->init_key_dist = 0; |
54790f73 VCG |
232 | req->resp_key_dist = dist_keys; |
233 | req->auth_req = authreq; | |
234 | return; | |
235 | } | |
236 | ||
237 | rsp->io_capability = conn->hcon->io_capability; | |
238 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
239 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
2b64d153 | 240 | rsp->init_key_dist = 0; |
54790f73 VCG |
241 | rsp->resp_key_dist = req->resp_key_dist & dist_keys; |
242 | rsp->auth_req = authreq; | |
b8e66eac VCG |
243 | } |
244 | ||
3158c50c VCG |
245 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
246 | { | |
1c1def09 VCG |
247 | struct smp_chan *smp = conn->smp_chan; |
248 | ||
3158c50c VCG |
249 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
250 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) | |
251 | return SMP_ENC_KEY_SIZE; | |
252 | ||
1c1def09 | 253 | smp->smp_key_size = max_key_size; |
3158c50c VCG |
254 | |
255 | return 0; | |
256 | } | |
257 | ||
4f957a76 BG |
258 | static void smp_failure(struct l2cap_conn *conn, u8 reason, u8 send) |
259 | { | |
260 | if (send) | |
261 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), | |
262 | &reason); | |
263 | ||
264 | clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->hcon->pend); | |
265 | mgmt_auth_failed(conn->hcon->hdev, conn->dst, reason); | |
6c9d42a1 | 266 | cancel_delayed_work_sync(&conn->security_timer); |
4f957a76 BG |
267 | smp_chan_destroy(conn); |
268 | } | |
269 | ||
2b64d153 BG |
270 | #define JUST_WORKS 0x00 |
271 | #define JUST_CFM 0x01 | |
272 | #define REQ_PASSKEY 0x02 | |
273 | #define CFM_PASSKEY 0x03 | |
274 | #define REQ_OOB 0x04 | |
275 | #define OVERLAP 0xFF | |
276 | ||
277 | static const u8 gen_method[5][5] = { | |
278 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
279 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
280 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
281 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
282 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
283 | }; | |
284 | ||
285 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, | |
286 | u8 local_io, u8 remote_io) | |
287 | { | |
288 | struct hci_conn *hcon = conn->hcon; | |
289 | struct smp_chan *smp = conn->smp_chan; | |
290 | u8 method; | |
291 | u32 passkey = 0; | |
292 | int ret = 0; | |
293 | ||
294 | /* Initialize key for JUST WORKS */ | |
295 | memset(smp->tk, 0, sizeof(smp->tk)); | |
296 | clear_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
297 | ||
298 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
299 | ||
300 | /* If neither side wants MITM, use JUST WORKS */ | |
301 | /* If either side has unknown io_caps, use JUST WORKS */ | |
302 | /* Otherwise, look up method from the table */ | |
303 | if (!(auth & SMP_AUTH_MITM) || | |
304 | local_io > SMP_IO_KEYBOARD_DISPLAY || | |
305 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
306 | method = JUST_WORKS; | |
307 | else | |
308 | method = gen_method[local_io][remote_io]; | |
309 | ||
310 | /* If not bonding, don't ask user to confirm a Zero TK */ | |
311 | if (!(auth & SMP_AUTH_BONDING) && method == JUST_CFM) | |
312 | method = JUST_WORKS; | |
313 | ||
314 | /* If Just Works, Continue with Zero TK */ | |
315 | if (method == JUST_WORKS) { | |
316 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | /* Not Just Works/Confirm results in MITM Authentication */ | |
321 | if (method != JUST_CFM) | |
322 | set_bit(SMP_FLAG_MITM_AUTH, &smp->smp_flags); | |
323 | ||
324 | /* If both devices have Keyoard-Display I/O, the master | |
325 | * Confirms and the slave Enters the passkey. | |
326 | */ | |
327 | if (method == OVERLAP) { | |
328 | if (hcon->link_mode & HCI_LM_MASTER) | |
329 | method = CFM_PASSKEY; | |
330 | else | |
331 | method = REQ_PASSKEY; | |
332 | } | |
333 | ||
334 | /* Generate random passkey. Not valid until confirmed. */ | |
335 | if (method == CFM_PASSKEY) { | |
336 | u8 key[16]; | |
337 | ||
338 | memset(key, 0, sizeof(key)); | |
339 | get_random_bytes(&passkey, sizeof(passkey)); | |
340 | passkey %= 1000000; | |
341 | put_unaligned_le32(passkey, key); | |
342 | swap128(key, smp->tk); | |
343 | BT_DBG("PassKey: %d", passkey); | |
344 | } | |
345 | ||
346 | hci_dev_lock(hcon->hdev); | |
347 | ||
348 | if (method == REQ_PASSKEY) | |
349 | ret = mgmt_user_passkey_request(hcon->hdev, conn->dst); | |
350 | else | |
351 | ret = mgmt_user_confirm_request(hcon->hdev, conn->dst, | |
352 | cpu_to_le32(passkey), 0); | |
353 | ||
354 | hci_dev_unlock(hcon->hdev); | |
355 | ||
356 | return ret; | |
357 | } | |
358 | ||
8aab4757 VCG |
359 | static void confirm_work(struct work_struct *work) |
360 | { | |
361 | struct smp_chan *smp = container_of(work, struct smp_chan, confirm); | |
362 | struct l2cap_conn *conn = smp->conn; | |
363 | struct crypto_blkcipher *tfm; | |
364 | struct smp_cmd_pairing_confirm cp; | |
365 | int ret; | |
366 | u8 res[16], reason; | |
367 | ||
368 | BT_DBG("conn %p", conn); | |
369 | ||
370 | tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); | |
371 | if (IS_ERR(tfm)) { | |
372 | reason = SMP_UNSPECIFIED; | |
373 | goto error; | |
374 | } | |
375 | ||
376 | smp->tfm = tfm; | |
377 | ||
378 | if (conn->hcon->out) | |
379 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0, | |
380 | conn->src, conn->hcon->dst_type, conn->dst, | |
381 | res); | |
382 | else | |
383 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, | |
384 | conn->hcon->dst_type, conn->dst, 0, conn->src, | |
385 | res); | |
386 | if (ret) { | |
387 | reason = SMP_UNSPECIFIED; | |
388 | goto error; | |
389 | } | |
390 | ||
2b64d153 BG |
391 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); |
392 | ||
8aab4757 VCG |
393 | swap128(res, cp.confirm_val); |
394 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); | |
395 | ||
396 | return; | |
397 | ||
398 | error: | |
4f957a76 | 399 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
400 | } |
401 | ||
402 | static void random_work(struct work_struct *work) | |
403 | { | |
404 | struct smp_chan *smp = container_of(work, struct smp_chan, random); | |
405 | struct l2cap_conn *conn = smp->conn; | |
406 | struct hci_conn *hcon = conn->hcon; | |
407 | struct crypto_blkcipher *tfm = smp->tfm; | |
408 | u8 reason, confirm[16], res[16], key[16]; | |
409 | int ret; | |
410 | ||
411 | if (IS_ERR_OR_NULL(tfm)) { | |
412 | reason = SMP_UNSPECIFIED; | |
413 | goto error; | |
414 | } | |
415 | ||
416 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
417 | ||
418 | if (hcon->out) | |
419 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0, | |
420 | conn->src, hcon->dst_type, conn->dst, | |
421 | res); | |
422 | else | |
423 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, | |
424 | hcon->dst_type, conn->dst, 0, conn->src, | |
425 | res); | |
426 | if (ret) { | |
427 | reason = SMP_UNSPECIFIED; | |
428 | goto error; | |
429 | } | |
430 | ||
431 | swap128(res, confirm); | |
432 | ||
433 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { | |
434 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
435 | reason = SMP_CONFIRM_FAILED; | |
436 | goto error; | |
437 | } | |
438 | ||
439 | if (hcon->out) { | |
440 | u8 stk[16], rand[8]; | |
441 | __le16 ediv; | |
442 | ||
443 | memset(rand, 0, sizeof(rand)); | |
444 | ediv = 0; | |
445 | ||
446 | smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key); | |
447 | swap128(key, stk); | |
448 | ||
449 | memset(stk + smp->smp_key_size, 0, | |
450 | SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size); | |
451 | ||
452 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend)) { | |
453 | reason = SMP_UNSPECIFIED; | |
454 | goto error; | |
455 | } | |
456 | ||
457 | hci_le_start_enc(hcon, ediv, rand, stk); | |
458 | hcon->enc_key_size = smp->smp_key_size; | |
459 | } else { | |
460 | u8 stk[16], r[16], rand[8]; | |
461 | __le16 ediv; | |
462 | ||
463 | memset(rand, 0, sizeof(rand)); | |
464 | ediv = 0; | |
465 | ||
466 | swap128(smp->prnd, r); | |
467 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r); | |
468 | ||
469 | smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key); | |
470 | swap128(key, stk); | |
471 | ||
472 | memset(stk + smp->smp_key_size, 0, | |
473 | SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size); | |
474 | ||
475 | hci_add_ltk(hcon->hdev, 0, conn->dst, smp->smp_key_size, | |
476 | ediv, rand, stk); | |
477 | } | |
478 | ||
479 | return; | |
480 | ||
481 | error: | |
4f957a76 | 482 | smp_failure(conn, reason, 1); |
8aab4757 VCG |
483 | } |
484 | ||
485 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) | |
486 | { | |
487 | struct smp_chan *smp; | |
488 | ||
489 | smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC); | |
490 | if (!smp) | |
491 | return NULL; | |
492 | ||
493 | INIT_WORK(&smp->confirm, confirm_work); | |
494 | INIT_WORK(&smp->random, random_work); | |
495 | ||
496 | smp->conn = conn; | |
497 | conn->smp_chan = smp; | |
2b64d153 | 498 | conn->hcon->smp_conn = conn; |
8aab4757 VCG |
499 | |
500 | hci_conn_hold(conn->hcon); | |
501 | ||
502 | return smp; | |
503 | } | |
504 | ||
505 | void smp_chan_destroy(struct l2cap_conn *conn) | |
506 | { | |
c8eb9690 BG |
507 | struct smp_chan *smp = conn->smp_chan; |
508 | ||
509 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend); | |
510 | ||
511 | if (smp->tfm) | |
512 | crypto_free_blkcipher(smp->tfm); | |
513 | ||
514 | kfree(smp); | |
515 | conn->smp_chan = NULL; | |
2b64d153 | 516 | conn->hcon->smp_conn = NULL; |
8aab4757 VCG |
517 | hci_conn_put(conn->hcon); |
518 | } | |
519 | ||
2b64d153 BG |
520 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
521 | { | |
522 | struct l2cap_conn *conn = hcon->smp_conn; | |
523 | struct smp_chan *smp; | |
524 | u32 value; | |
525 | u8 key[16]; | |
526 | ||
527 | BT_DBG(""); | |
528 | ||
529 | if (!conn) | |
530 | return -ENOTCONN; | |
531 | ||
532 | smp = conn->smp_chan; | |
533 | ||
534 | switch (mgmt_op) { | |
535 | case MGMT_OP_USER_PASSKEY_REPLY: | |
536 | value = le32_to_cpu(passkey); | |
537 | memset(key, 0, sizeof(key)); | |
538 | BT_DBG("PassKey: %d", value); | |
539 | put_unaligned_le32(value, key); | |
540 | swap128(key, smp->tk); | |
541 | /* Fall Through */ | |
542 | case MGMT_OP_USER_CONFIRM_REPLY: | |
543 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); | |
544 | break; | |
545 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
546 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
547 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); | |
548 | return 0; | |
549 | default: | |
550 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); | |
551 | return -EOPNOTSUPP; | |
552 | } | |
553 | ||
554 | /* If it is our turn to send Pairing Confirm, do so now */ | |
555 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags)) | |
556 | queue_work(hcon->hdev->workqueue, &smp->confirm); | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
da85e5e5 | 561 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 562 | { |
3158c50c | 563 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
8aab4757 | 564 | struct smp_chan *smp; |
3158c50c | 565 | u8 key_size; |
2b64d153 | 566 | u8 auth = SMP_AUTH_NONE; |
8aab4757 | 567 | int ret; |
88ba43b6 AB |
568 | |
569 | BT_DBG("conn %p", conn); | |
570 | ||
2b64d153 BG |
571 | if (conn->hcon->link_mode & HCI_LM_MASTER) |
572 | return SMP_CMD_NOTSUPP; | |
573 | ||
d26a2345 | 574 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend)) |
8aab4757 VCG |
575 | smp = smp_chan_create(conn); |
576 | ||
577 | smp = conn->smp_chan; | |
d26a2345 | 578 | |
1c1def09 VCG |
579 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
580 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 581 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 582 | |
2b64d153 BG |
583 | /* We didn't start the pairing, so match remote */ |
584 | if (req->auth_req & SMP_AUTH_BONDING) | |
585 | auth = req->auth_req; | |
da85e5e5 | 586 | |
2b64d153 | 587 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
588 | |
589 | key_size = min(req->max_key_size, rsp.max_key_size); | |
590 | if (check_enc_key_size(conn, key_size)) | |
591 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 592 | |
8aab4757 VCG |
593 | ret = smp_rand(smp->prnd); |
594 | if (ret) | |
595 | return SMP_UNSPECIFIED; | |
596 | ||
1c1def09 VCG |
597 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
598 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 599 | |
3158c50c | 600 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 601 | |
2b64d153 BG |
602 | /* Request setup of TK */ |
603 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
604 | if (ret) | |
605 | return SMP_UNSPECIFIED; | |
606 | ||
da85e5e5 | 607 | return 0; |
88ba43b6 AB |
608 | } |
609 | ||
da85e5e5 | 610 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 611 | { |
3158c50c | 612 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
1c1def09 | 613 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 614 | struct hci_dev *hdev = conn->hcon->hdev; |
2b64d153 | 615 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 616 | int ret; |
88ba43b6 AB |
617 | |
618 | BT_DBG("conn %p", conn); | |
619 | ||
2b64d153 BG |
620 | if (!(conn->hcon->link_mode & HCI_LM_MASTER)) |
621 | return SMP_CMD_NOTSUPP; | |
622 | ||
3158c50c VCG |
623 | skb_pull(skb, sizeof(*rsp)); |
624 | ||
1c1def09 | 625 | req = (void *) &smp->preq[1]; |
da85e5e5 | 626 | |
3158c50c VCG |
627 | key_size = min(req->max_key_size, rsp->max_key_size); |
628 | if (check_enc_key_size(conn, key_size)) | |
629 | return SMP_ENC_KEY_SIZE; | |
630 | ||
1c1def09 | 631 | ret = smp_rand(smp->prnd); |
7d24ddcc | 632 | if (ret) |
da85e5e5 | 633 | return SMP_UNSPECIFIED; |
7d24ddcc | 634 | |
8aab4757 VCG |
635 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
636 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 637 | |
2b64d153 BG |
638 | if ((req->auth_req & SMP_AUTH_BONDING) && |
639 | (rsp->auth_req & SMP_AUTH_BONDING)) | |
640 | auth = SMP_AUTH_BONDING; | |
641 | ||
642 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
643 | ||
644 | ret = tk_request(conn, 0, auth, rsp->io_capability, req->io_capability); | |
645 | if (ret) | |
646 | return SMP_UNSPECIFIED; | |
647 | ||
648 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); | |
649 | ||
650 | /* Can't compose response until we have been confirmed */ | |
651 | if (!test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) | |
652 | return 0; | |
653 | ||
8aab4757 | 654 | queue_work(hdev->workqueue, &smp->confirm); |
da85e5e5 VCG |
655 | |
656 | return 0; | |
88ba43b6 AB |
657 | } |
658 | ||
da85e5e5 | 659 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 660 | { |
1c1def09 | 661 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 662 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 663 | |
88ba43b6 AB |
664 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
665 | ||
1c1def09 VCG |
666 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
667 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 668 | |
7d24ddcc AB |
669 | if (conn->hcon->out) { |
670 | u8 random[16]; | |
88ba43b6 | 671 | |
1c1def09 | 672 | swap128(smp->prnd, random); |
88ba43b6 | 673 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random), |
7d24ddcc | 674 | random); |
2b64d153 | 675 | } else if (test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) { |
8aab4757 | 676 | queue_work(hdev->workqueue, &smp->confirm); |
2b64d153 BG |
677 | } else { |
678 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); | |
88ba43b6 | 679 | } |
da85e5e5 VCG |
680 | |
681 | return 0; | |
88ba43b6 AB |
682 | } |
683 | ||
da85e5e5 | 684 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 685 | { |
1c1def09 | 686 | struct smp_chan *smp = conn->smp_chan; |
8aab4757 | 687 | struct hci_dev *hdev = conn->hcon->hdev; |
7d24ddcc | 688 | |
8aab4757 | 689 | BT_DBG("conn %p", conn); |
3158c50c | 690 | |
8aab4757 VCG |
691 | swap128(skb->data, smp->rrnd); |
692 | skb_pull(skb, sizeof(smp->rrnd)); | |
e7e62c85 | 693 | |
8aab4757 | 694 | queue_work(hdev->workqueue, &smp->random); |
da85e5e5 VCG |
695 | |
696 | return 0; | |
88ba43b6 AB |
697 | } |
698 | ||
988c5997 VCG |
699 | static u8 smp_ltk_encrypt(struct l2cap_conn *conn) |
700 | { | |
701 | struct link_key *key; | |
702 | struct key_master_id *master; | |
703 | struct hci_conn *hcon = conn->hcon; | |
704 | ||
705 | key = hci_find_link_key_type(hcon->hdev, conn->dst, | |
706 | HCI_LK_SMP_LTK); | |
707 | if (!key) | |
708 | return 0; | |
709 | ||
710 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, | |
711 | &hcon->pend)) | |
712 | return 1; | |
713 | ||
714 | master = (void *) key->data; | |
715 | hci_le_start_enc(hcon, master->ediv, master->rand, | |
716 | key->val); | |
717 | hcon->enc_key_size = key->pin_len; | |
718 | ||
719 | return 1; | |
720 | ||
721 | } | |
da85e5e5 | 722 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
723 | { |
724 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
725 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 726 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 727 | struct smp_chan *smp; |
88ba43b6 AB |
728 | |
729 | BT_DBG("conn %p", conn); | |
730 | ||
2b64d153 | 731 | hcon->pending_sec_level = authreq_to_seclevel(rp->auth_req); |
feb45eb5 | 732 | |
988c5997 VCG |
733 | if (smp_ltk_encrypt(conn)) |
734 | return 0; | |
735 | ||
d26a2345 | 736 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) |
da85e5e5 | 737 | return 0; |
f1cb9af5 | 738 | |
8aab4757 | 739 | smp = smp_chan_create(conn); |
d26a2345 | 740 | |
88ba43b6 | 741 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 742 | |
da85e5e5 | 743 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 744 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 745 | |
1c1def09 VCG |
746 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
747 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 748 | |
88ba43b6 | 749 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 750 | |
da85e5e5 | 751 | return 0; |
88ba43b6 AB |
752 | } |
753 | ||
eb492e01 AB |
754 | int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) |
755 | { | |
3a0259bb | 756 | struct hci_conn *hcon = conn->hcon; |
1c1def09 | 757 | struct smp_chan *smp = conn->smp_chan; |
2b64d153 | 758 | __u8 authreq; |
eb492e01 | 759 | |
3a0259bb VCG |
760 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
761 | ||
2e65c9d2 AG |
762 | if (!lmp_host_le_capable(hcon->hdev)) |
763 | return 1; | |
764 | ||
f1cb9af5 VCG |
765 | if (sec_level == BT_SECURITY_LOW) |
766 | return 1; | |
eb492e01 | 767 | |
f1cb9af5 | 768 | if (hcon->sec_level >= sec_level) |
eb492e01 | 769 | return 1; |
f1cb9af5 | 770 | |
988c5997 VCG |
771 | if (hcon->link_mode & HCI_LM_MASTER) |
772 | if (smp_ltk_encrypt(conn)) | |
02bc7455 | 773 | goto done; |
d26a2345 VCG |
774 | |
775 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) | |
776 | return 0; | |
777 | ||
8aab4757 | 778 | smp = smp_chan_create(conn); |
2b64d153 BG |
779 | if (!smp) |
780 | return 1; | |
781 | ||
782 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 783 | |
d26a2345 VCG |
784 | if (hcon->link_mode & HCI_LM_MASTER) { |
785 | struct smp_cmd_pairing cp; | |
f01ead31 | 786 | |
2b64d153 | 787 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
788 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
789 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 790 | |
eb492e01 AB |
791 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
792 | } else { | |
793 | struct smp_cmd_security_req cp; | |
2b64d153 | 794 | cp.auth_req = authreq; |
eb492e01 AB |
795 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
796 | } | |
797 | ||
02bc7455 | 798 | done: |
f1cb9af5 | 799 | hcon->pending_sec_level = sec_level; |
f1cb9af5 | 800 | |
eb492e01 AB |
801 | return 0; |
802 | } | |
803 | ||
7034b911 VCG |
804 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
805 | { | |
16b90839 | 806 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
1c1def09 | 807 | struct smp_chan *smp = conn->smp_chan; |
16b90839 VCG |
808 | |
809 | skb_pull(skb, sizeof(*rp)); | |
810 | ||
1c1def09 | 811 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 812 | |
7034b911 VCG |
813 | return 0; |
814 | } | |
815 | ||
816 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
817 | { | |
16b90839 | 818 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
1c1def09 | 819 | struct smp_chan *smp = conn->smp_chan; |
16b90839 VCG |
820 | |
821 | skb_pull(skb, sizeof(*rp)); | |
7034b911 | 822 | |
3573b80c | 823 | hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size, |
1c1def09 | 824 | rp->ediv, rp->rand, smp->tk); |
7034b911 VCG |
825 | |
826 | smp_distribute_keys(conn, 1); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
eb492e01 AB |
831 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
832 | { | |
833 | __u8 code = skb->data[0]; | |
834 | __u8 reason; | |
835 | int err = 0; | |
836 | ||
2e65c9d2 AG |
837 | if (!lmp_host_le_capable(conn->hcon->hdev)) { |
838 | err = -ENOTSUPP; | |
839 | reason = SMP_PAIRING_NOTSUPP; | |
840 | goto done; | |
841 | } | |
842 | ||
eb492e01 AB |
843 | skb_pull(skb, sizeof(code)); |
844 | ||
845 | switch (code) { | |
846 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 847 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
848 | break; |
849 | ||
850 | case SMP_CMD_PAIRING_FAIL: | |
4f957a76 | 851 | smp_failure(conn, skb->data[0], 0); |
da85e5e5 VCG |
852 | reason = 0; |
853 | err = -EPERM; | |
eb492e01 AB |
854 | break; |
855 | ||
856 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 857 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
858 | break; |
859 | ||
860 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 861 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
862 | break; |
863 | ||
eb492e01 | 864 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 865 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
866 | break; |
867 | ||
eb492e01 | 868 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 869 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
870 | break; |
871 | ||
eb492e01 | 872 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
873 | reason = smp_cmd_encrypt_info(conn, skb); |
874 | break; | |
875 | ||
eb492e01 | 876 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
877 | reason = smp_cmd_master_ident(conn, skb); |
878 | break; | |
879 | ||
eb492e01 AB |
880 | case SMP_CMD_IDENT_INFO: |
881 | case SMP_CMD_IDENT_ADDR_INFO: | |
882 | case SMP_CMD_SIGN_INFO: | |
7034b911 VCG |
883 | /* Just ignored */ |
884 | reason = 0; | |
885 | break; | |
886 | ||
eb492e01 AB |
887 | default: |
888 | BT_DBG("Unknown command code 0x%2.2x", code); | |
889 | ||
890 | reason = SMP_CMD_NOTSUPP; | |
eb492e01 | 891 | err = -EOPNOTSUPP; |
3a0259bb | 892 | goto done; |
eb492e01 AB |
893 | } |
894 | ||
3a0259bb VCG |
895 | done: |
896 | if (reason) | |
4f957a76 | 897 | smp_failure(conn, reason, 1); |
3a0259bb | 898 | |
eb492e01 AB |
899 | kfree_skb(skb); |
900 | return err; | |
901 | } | |
7034b911 VCG |
902 | |
903 | int smp_distribute_keys(struct l2cap_conn *conn, __u8 force) | |
904 | { | |
905 | struct smp_cmd_pairing *req, *rsp; | |
1c1def09 | 906 | struct smp_chan *smp = conn->smp_chan; |
7034b911 VCG |
907 | __u8 *keydist; |
908 | ||
909 | BT_DBG("conn %p force %d", conn, force); | |
910 | ||
d26a2345 VCG |
911 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend)) |
912 | return 0; | |
913 | ||
1c1def09 | 914 | rsp = (void *) &smp->prsp[1]; |
7034b911 VCG |
915 | |
916 | /* The responder sends its keys first */ | |
917 | if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07)) | |
918 | return 0; | |
919 | ||
1c1def09 | 920 | req = (void *) &smp->preq[1]; |
7034b911 VCG |
921 | |
922 | if (conn->hcon->out) { | |
923 | keydist = &rsp->init_key_dist; | |
924 | *keydist &= req->init_key_dist; | |
925 | } else { | |
926 | keydist = &rsp->resp_key_dist; | |
927 | *keydist &= req->resp_key_dist; | |
928 | } | |
929 | ||
930 | ||
931 | BT_DBG("keydist 0x%x", *keydist); | |
932 | ||
933 | if (*keydist & SMP_DIST_ENC_KEY) { | |
934 | struct smp_cmd_encrypt_info enc; | |
935 | struct smp_cmd_master_ident ident; | |
936 | __le16 ediv; | |
937 | ||
938 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
939 | get_random_bytes(&ediv, sizeof(ediv)); | |
940 | get_random_bytes(ident.rand, sizeof(ident.rand)); | |
941 | ||
942 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
943 | ||
1c1def09 | 944 | hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size, |
726b4ffc | 945 | ediv, ident.rand, enc.ltk); |
16b90839 | 946 | |
7034b911 VCG |
947 | ident.ediv = cpu_to_le16(ediv); |
948 | ||
949 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
950 | ||
951 | *keydist &= ~SMP_DIST_ENC_KEY; | |
952 | } | |
953 | ||
954 | if (*keydist & SMP_DIST_ID_KEY) { | |
955 | struct smp_cmd_ident_addr_info addrinfo; | |
956 | struct smp_cmd_ident_info idinfo; | |
957 | ||
958 | /* Send a dummy key */ | |
959 | get_random_bytes(idinfo.irk, sizeof(idinfo.irk)); | |
960 | ||
961 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
962 | ||
963 | /* Just public address */ | |
964 | memset(&addrinfo, 0, sizeof(addrinfo)); | |
965 | bacpy(&addrinfo.bdaddr, conn->src); | |
966 | ||
967 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
968 | &addrinfo); | |
969 | ||
970 | *keydist &= ~SMP_DIST_ID_KEY; | |
971 | } | |
972 | ||
973 | if (*keydist & SMP_DIST_SIGN) { | |
974 | struct smp_cmd_sign_info sign; | |
975 | ||
976 | /* Send a dummy key */ | |
977 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); | |
978 | ||
979 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); | |
980 | ||
981 | *keydist &= ~SMP_DIST_SIGN; | |
982 | } | |
983 | ||
d26a2345 VCG |
984 | if (conn->hcon->out || force) { |
985 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend); | |
6c9d42a1 | 986 | cancel_delayed_work_sync(&conn->security_timer); |
8aab4757 | 987 | smp_chan_destroy(conn); |
d26a2345 VCG |
988 | } |
989 | ||
7034b911 VCG |
990 | return 0; |
991 | } |