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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> |
ac4b7236 MH |
31 | |
32 | #include "smp.h" | |
d22ef0bc | 33 | |
17b02e62 | 34 | #define SMP_TIMEOUT msecs_to_jiffies(30000) |
5d3de7df | 35 | |
065a13e2 JH |
36 | #define AUTH_REQ_MASK 0x07 |
37 | ||
533e35d4 JH |
38 | enum { |
39 | SMP_FLAG_TK_VALID, | |
40 | SMP_FLAG_CFM_PENDING, | |
41 | SMP_FLAG_MITM_AUTH, | |
42 | SMP_FLAG_COMPLETE, | |
43 | SMP_FLAG_INITIATOR, | |
44 | }; | |
4bc58f51 JH |
45 | |
46 | struct smp_chan { | |
47 | struct l2cap_conn *conn; | |
48 | u8 preq[7]; /* SMP Pairing Request */ | |
49 | u8 prsp[7]; /* SMP Pairing Response */ | |
50 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
51 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
52 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
53 | u8 tk[16]; /* SMP Temporary Key */ | |
54 | u8 enc_key_size; | |
55 | u8 remote_key_dist; | |
56 | bdaddr_t id_addr; | |
57 | u8 id_addr_type; | |
58 | u8 irk[16]; | |
59 | struct smp_csrk *csrk; | |
60 | struct smp_csrk *slave_csrk; | |
61 | struct smp_ltk *ltk; | |
62 | struct smp_ltk *slave_ltk; | |
63 | struct smp_irk *remote_irk; | |
4a74d658 | 64 | unsigned long flags; |
6a7bd103 JH |
65 | |
66 | struct crypto_blkcipher *tfm_aes; | |
4bc58f51 JH |
67 | }; |
68 | ||
8a2936f4 | 69 | static inline void swap_buf(const u8 *src, u8 *dst, size_t len) |
d22ef0bc | 70 | { |
8a2936f4 | 71 | size_t i; |
d22ef0bc | 72 | |
8a2936f4 JH |
73 | for (i = 0; i < len; i++) |
74 | dst[len - 1 - i] = src[i]; | |
d22ef0bc AB |
75 | } |
76 | ||
77 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
78 | { | |
79 | struct blkcipher_desc desc; | |
80 | struct scatterlist sg; | |
943a732a | 81 | uint8_t tmp[16], data[16]; |
201a5929 | 82 | int err; |
d22ef0bc AB |
83 | |
84 | if (tfm == NULL) { | |
85 | BT_ERR("tfm %p", tfm); | |
86 | return -EINVAL; | |
87 | } | |
88 | ||
89 | desc.tfm = tfm; | |
90 | desc.flags = 0; | |
91 | ||
943a732a | 92 | /* The most significant octet of key corresponds to k[0] */ |
8a2936f4 | 93 | swap_buf(k, tmp, 16); |
943a732a JH |
94 | |
95 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
96 | if (err) { |
97 | BT_ERR("cipher setkey failed: %d", err); | |
98 | return err; | |
99 | } | |
100 | ||
943a732a | 101 | /* Most significant octet of plaintextData corresponds to data[0] */ |
8a2936f4 | 102 | swap_buf(r, data, 16); |
943a732a JH |
103 | |
104 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 105 | |
d22ef0bc AB |
106 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
107 | if (err) | |
108 | BT_ERR("Encrypt data error %d", err); | |
109 | ||
943a732a | 110 | /* Most significant octet of encryptedData corresponds to data[0] */ |
8a2936f4 | 111 | swap_buf(data, r, 16); |
943a732a | 112 | |
d22ef0bc AB |
113 | return err; |
114 | } | |
115 | ||
60478054 JH |
116 | static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3]) |
117 | { | |
943a732a | 118 | u8 _res[16]; |
60478054 JH |
119 | int err; |
120 | ||
121 | /* r' = padding || r */ | |
943a732a JH |
122 | memcpy(_res, r, 3); |
123 | memset(_res + 3, 0, 13); | |
60478054 | 124 | |
943a732a | 125 | err = smp_e(tfm, irk, _res); |
60478054 JH |
126 | if (err) { |
127 | BT_ERR("Encrypt error"); | |
128 | return err; | |
129 | } | |
130 | ||
131 | /* The output of the random address function ah is: | |
132 | * ah(h, r) = e(k, r') mod 2^24 | |
133 | * The output of the security function e is then truncated to 24 bits | |
134 | * by taking the least significant 24 bits of the output of e as the | |
135 | * result of ah. | |
136 | */ | |
943a732a | 137 | memcpy(res, _res, 3); |
60478054 JH |
138 | |
139 | return 0; | |
140 | } | |
141 | ||
142 | bool smp_irk_matches(struct crypto_blkcipher *tfm, u8 irk[16], | |
143 | bdaddr_t *bdaddr) | |
144 | { | |
145 | u8 hash[3]; | |
146 | int err; | |
147 | ||
148 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); | |
149 | ||
150 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
151 | if (err) | |
152 | return false; | |
153 | ||
154 | return !memcmp(bdaddr->b, hash, 3); | |
155 | } | |
156 | ||
b1e2b3ae JH |
157 | int smp_generate_rpa(struct crypto_blkcipher *tfm, u8 irk[16], bdaddr_t *rpa) |
158 | { | |
159 | int err; | |
160 | ||
161 | get_random_bytes(&rpa->b[3], 3); | |
162 | ||
163 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
164 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
165 | ||
166 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
167 | if (err < 0) | |
168 | return err; | |
169 | ||
170 | BT_DBG("RPA %pMR", rpa); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
ec70f36f JH |
175 | static int smp_c1(struct smp_chan *smp, u8 k[16], u8 r[16], u8 preq[7], |
176 | u8 pres[7], u8 _iat, bdaddr_t *ia, u8 _rat, bdaddr_t *ra, | |
177 | u8 res[16]) | |
d22ef0bc | 178 | { |
ec70f36f | 179 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
d22ef0bc AB |
180 | u8 p1[16], p2[16]; |
181 | int err; | |
182 | ||
ec70f36f JH |
183 | BT_DBG("%s", hdev->name); |
184 | ||
d22ef0bc AB |
185 | memset(p1, 0, 16); |
186 | ||
187 | /* p1 = pres || preq || _rat || _iat */ | |
943a732a JH |
188 | p1[0] = _iat; |
189 | p1[1] = _rat; | |
190 | memcpy(p1 + 2, preq, 7); | |
191 | memcpy(p1 + 9, pres, 7); | |
d22ef0bc AB |
192 | |
193 | /* p2 = padding || ia || ra */ | |
943a732a JH |
194 | memcpy(p2, ra, 6); |
195 | memcpy(p2 + 6, ia, 6); | |
196 | memset(p2 + 12, 0, 4); | |
d22ef0bc AB |
197 | |
198 | /* res = r XOR p1 */ | |
199 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
200 | ||
201 | /* res = e(k, res) */ | |
ec70f36f | 202 | err = smp_e(smp->tfm_aes, k, res); |
d22ef0bc AB |
203 | if (err) { |
204 | BT_ERR("Encrypt data error"); | |
205 | return err; | |
206 | } | |
207 | ||
208 | /* res = res XOR p2 */ | |
209 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
210 | ||
211 | /* res = e(k, res) */ | |
ec70f36f | 212 | err = smp_e(smp->tfm_aes, k, res); |
d22ef0bc AB |
213 | if (err) |
214 | BT_ERR("Encrypt data error"); | |
215 | ||
216 | return err; | |
217 | } | |
218 | ||
ec70f36f JH |
219 | static int smp_s1(struct smp_chan *smp, u8 k[16], u8 r1[16], u8 r2[16], |
220 | u8 _r[16]) | |
d22ef0bc | 221 | { |
ec70f36f | 222 | struct hci_dev *hdev = smp->conn->hcon->hdev; |
d22ef0bc AB |
223 | int err; |
224 | ||
ec70f36f JH |
225 | BT_DBG("%s", hdev->name); |
226 | ||
d22ef0bc | 227 | /* Just least significant octets from r1 and r2 are considered */ |
943a732a JH |
228 | memcpy(_r, r2, 8); |
229 | memcpy(_r + 8, r1, 8); | |
d22ef0bc | 230 | |
ec70f36f | 231 | err = smp_e(smp->tfm_aes, k, _r); |
d22ef0bc AB |
232 | if (err) |
233 | BT_ERR("Encrypt data error"); | |
234 | ||
235 | return err; | |
236 | } | |
237 | ||
eb492e01 | 238 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, |
f1560463 | 239 | u16 dlen, void *data) |
eb492e01 AB |
240 | { |
241 | struct sk_buff *skb; | |
242 | struct l2cap_hdr *lh; | |
243 | int len; | |
244 | ||
245 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; | |
246 | ||
247 | if (len > conn->mtu) | |
248 | return NULL; | |
249 | ||
250 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
251 | if (!skb) | |
252 | return NULL; | |
253 | ||
254 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
255 | lh->len = cpu_to_le16(sizeof(code) + dlen); | |
dcf4adbf | 256 | lh->cid = cpu_to_le16(L2CAP_CID_SMP); |
eb492e01 AB |
257 | |
258 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); | |
259 | ||
260 | memcpy(skb_put(skb, dlen), data, dlen); | |
261 | ||
262 | return skb; | |
263 | } | |
264 | ||
265 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) | |
266 | { | |
267 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); | |
268 | ||
269 | BT_DBG("code 0x%2.2x", code); | |
270 | ||
271 | if (!skb) | |
272 | return; | |
273 | ||
73d80deb LAD |
274 | skb->priority = HCI_PRIO_MAX; |
275 | hci_send_acl(conn->hchan, skb, 0); | |
e2dcd113 | 276 | |
6c9d42a1 | 277 | cancel_delayed_work_sync(&conn->security_timer); |
17b02e62 | 278 | schedule_delayed_work(&conn->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
279 | } |
280 | ||
2b64d153 BG |
281 | static __u8 authreq_to_seclevel(__u8 authreq) |
282 | { | |
283 | if (authreq & SMP_AUTH_MITM) | |
284 | return BT_SECURITY_HIGH; | |
285 | else | |
286 | return BT_SECURITY_MEDIUM; | |
287 | } | |
288 | ||
289 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
290 | { | |
291 | switch (sec_level) { | |
292 | case BT_SECURITY_HIGH: | |
293 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
294 | case BT_SECURITY_MEDIUM: | |
295 | return SMP_AUTH_BONDING; | |
296 | default: | |
297 | return SMP_AUTH_NONE; | |
298 | } | |
299 | } | |
300 | ||
b8e66eac | 301 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
302 | struct smp_cmd_pairing *req, |
303 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 304 | { |
fd349c02 JH |
305 | struct smp_chan *smp = conn->smp_chan; |
306 | struct hci_conn *hcon = conn->hcon; | |
307 | struct hci_dev *hdev = hcon->hdev; | |
308 | u8 local_dist = 0, remote_dist = 0; | |
54790f73 | 309 | |
a8b2d5c2 | 310 | if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
311 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
312 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 313 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
314 | } else { |
315 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
316 | } |
317 | ||
fd349c02 JH |
318 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
319 | remote_dist |= SMP_DIST_ID_KEY; | |
320 | ||
863efaf2 JH |
321 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
322 | local_dist |= SMP_DIST_ID_KEY; | |
323 | ||
54790f73 VCG |
324 | if (rsp == NULL) { |
325 | req->io_capability = conn->hcon->io_capability; | |
326 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
327 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
328 | req->init_key_dist = local_dist; |
329 | req->resp_key_dist = remote_dist; | |
065a13e2 | 330 | req->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
331 | |
332 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
333 | return; |
334 | } | |
335 | ||
336 | rsp->io_capability = conn->hcon->io_capability; | |
337 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
338 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
339 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
340 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
065a13e2 | 341 | rsp->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
342 | |
343 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
344 | } |
345 | ||
3158c50c VCG |
346 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
347 | { | |
1c1def09 VCG |
348 | struct smp_chan *smp = conn->smp_chan; |
349 | ||
3158c50c | 350 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 351 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
352 | return SMP_ENC_KEY_SIZE; |
353 | ||
f7aa611a | 354 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
84794e11 | 359 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 360 | { |
bab73cb6 JH |
361 | struct hci_conn *hcon = conn->hcon; |
362 | ||
84794e11 | 363 | if (reason) |
4f957a76 | 364 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 365 | &reason); |
4f957a76 | 366 | |
ce39fb4e MH |
367 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
368 | mgmt_auth_failed(hcon->hdev, &hcon->dst, hcon->type, hcon->dst_type, | |
369 | HCI_ERROR_AUTH_FAILURE); | |
f1c09c07 | 370 | |
61a0cfb0 AG |
371 | cancel_delayed_work_sync(&conn->security_timer); |
372 | ||
ce39fb4e | 373 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
f1c09c07 | 374 | smp_chan_destroy(conn); |
4f957a76 BG |
375 | } |
376 | ||
2b64d153 BG |
377 | #define JUST_WORKS 0x00 |
378 | #define JUST_CFM 0x01 | |
379 | #define REQ_PASSKEY 0x02 | |
380 | #define CFM_PASSKEY 0x03 | |
381 | #define REQ_OOB 0x04 | |
382 | #define OVERLAP 0xFF | |
383 | ||
384 | static const u8 gen_method[5][5] = { | |
385 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
386 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
387 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
388 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
389 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
390 | }; | |
391 | ||
581370cc JH |
392 | static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io) |
393 | { | |
2bcd4003 JH |
394 | /* If either side has unknown io_caps, use JUST_CFM (which gets |
395 | * converted later to JUST_WORKS if we're initiators. | |
396 | */ | |
581370cc JH |
397 | if (local_io > SMP_IO_KEYBOARD_DISPLAY || |
398 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2bcd4003 | 399 | return JUST_CFM; |
581370cc JH |
400 | |
401 | return gen_method[remote_io][local_io]; | |
402 | } | |
403 | ||
2b64d153 BG |
404 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
405 | u8 local_io, u8 remote_io) | |
406 | { | |
407 | struct hci_conn *hcon = conn->hcon; | |
408 | struct smp_chan *smp = conn->smp_chan; | |
409 | u8 method; | |
410 | u32 passkey = 0; | |
411 | int ret = 0; | |
412 | ||
413 | /* Initialize key for JUST WORKS */ | |
414 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 415 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
416 | |
417 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
418 | ||
2bcd4003 JH |
419 | /* If neither side wants MITM, either "just" confirm an incoming |
420 | * request or use just-works for outgoing ones. The JUST_CFM | |
421 | * will be converted to JUST_WORKS if necessary later in this | |
422 | * function. If either side has MITM look up the method from the | |
423 | * table. | |
424 | */ | |
581370cc | 425 | if (!(auth & SMP_AUTH_MITM)) |
2bcd4003 | 426 | method = JUST_CFM; |
2b64d153 | 427 | else |
581370cc | 428 | method = get_auth_method(smp, local_io, remote_io); |
2b64d153 | 429 | |
a82505c7 | 430 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 431 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
432 | method = JUST_WORKS; |
433 | ||
2b64d153 BG |
434 | /* If Just Works, Continue with Zero TK */ |
435 | if (method == JUST_WORKS) { | |
4a74d658 | 436 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
437 | return 0; |
438 | } | |
439 | ||
440 | /* Not Just Works/Confirm results in MITM Authentication */ | |
441 | if (method != JUST_CFM) | |
4a74d658 | 442 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
2b64d153 BG |
443 | |
444 | /* If both devices have Keyoard-Display I/O, the master | |
445 | * Confirms and the slave Enters the passkey. | |
446 | */ | |
447 | if (method == OVERLAP) { | |
40bef302 | 448 | if (hcon->role == HCI_ROLE_MASTER) |
2b64d153 BG |
449 | method = CFM_PASSKEY; |
450 | else | |
451 | method = REQ_PASSKEY; | |
452 | } | |
453 | ||
01ad34d2 | 454 | /* Generate random passkey. */ |
2b64d153 | 455 | if (method == CFM_PASSKEY) { |
943a732a | 456 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
457 | get_random_bytes(&passkey, sizeof(passkey)); |
458 | passkey %= 1000000; | |
943a732a | 459 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 460 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 461 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
462 | } |
463 | ||
464 | hci_dev_lock(hcon->hdev); | |
465 | ||
466 | if (method == REQ_PASSKEY) | |
ce39fb4e | 467 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 468 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
469 | else if (method == JUST_CFM) |
470 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
471 | hcon->type, hcon->dst_type, | |
472 | passkey, 1); | |
2b64d153 | 473 | else |
01ad34d2 | 474 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 475 | hcon->type, hcon->dst_type, |
39adbffe | 476 | passkey, 0); |
2b64d153 BG |
477 | |
478 | hci_dev_unlock(hcon->hdev); | |
479 | ||
480 | return ret; | |
481 | } | |
482 | ||
1cc61144 | 483 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 484 | { |
8aab4757 | 485 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
486 | struct smp_cmd_pairing_confirm cp; |
487 | int ret; | |
8aab4757 VCG |
488 | |
489 | BT_DBG("conn %p", conn); | |
490 | ||
ec70f36f | 491 | ret = smp_c1(smp, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 492 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
493 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
494 | cp.confirm_val); | |
1cc61144 JH |
495 | if (ret) |
496 | return SMP_UNSPECIFIED; | |
8aab4757 | 497 | |
4a74d658 | 498 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 499 | |
8aab4757 VCG |
500 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
501 | ||
1cc61144 | 502 | return 0; |
8aab4757 VCG |
503 | } |
504 | ||
861580a9 | 505 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 506 | { |
8aab4757 VCG |
507 | struct l2cap_conn *conn = smp->conn; |
508 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 509 | u8 confirm[16]; |
8aab4757 VCG |
510 | int ret; |
511 | ||
ec70f36f | 512 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 513 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
514 | |
515 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
516 | ||
ec70f36f | 517 | ret = smp_c1(smp, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 518 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 519 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
520 | if (ret) |
521 | return SMP_UNSPECIFIED; | |
8aab4757 | 522 | |
8aab4757 VCG |
523 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
524 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 525 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
526 | } |
527 | ||
528 | if (hcon->out) { | |
fe39c7b2 MH |
529 | u8 stk[16]; |
530 | __le64 rand = 0; | |
531 | __le16 ediv = 0; | |
8aab4757 | 532 | |
ec70f36f | 533 | smp_s1(smp, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 534 | |
f7aa611a | 535 | memset(stk + smp->enc_key_size, 0, |
04124681 | 536 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 537 | |
861580a9 JH |
538 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
539 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
540 | |
541 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 542 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 543 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 544 | } else { |
fff3490f | 545 | u8 stk[16], auth; |
fe39c7b2 MH |
546 | __le64 rand = 0; |
547 | __le16 ediv = 0; | |
8aab4757 | 548 | |
943a732a JH |
549 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
550 | smp->prnd); | |
8aab4757 | 551 | |
ec70f36f | 552 | smp_s1(smp, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 553 | |
f7aa611a | 554 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 555 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 556 | |
fff3490f JH |
557 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
558 | auth = 1; | |
559 | else | |
560 | auth = 0; | |
561 | ||
7d5843b7 JH |
562 | /* Even though there's no _SLAVE suffix this is the |
563 | * slave STK we're adding for later lookup (the master | |
564 | * STK never needs to be stored). | |
565 | */ | |
ce39fb4e | 566 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 567 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
568 | } |
569 | ||
861580a9 | 570 | return 0; |
8aab4757 VCG |
571 | } |
572 | ||
573 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) | |
574 | { | |
575 | struct smp_chan *smp; | |
576 | ||
f1560463 | 577 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
8aab4757 VCG |
578 | if (!smp) |
579 | return NULL; | |
580 | ||
6a7bd103 JH |
581 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
582 | if (IS_ERR(smp->tfm_aes)) { | |
583 | BT_ERR("Unable to create ECB crypto context"); | |
584 | kfree(smp); | |
585 | return NULL; | |
586 | } | |
587 | ||
8aab4757 VCG |
588 | smp->conn = conn; |
589 | conn->smp_chan = smp; | |
590 | ||
591 | hci_conn_hold(conn->hcon); | |
592 | ||
593 | return smp; | |
594 | } | |
595 | ||
596 | void smp_chan_destroy(struct l2cap_conn *conn) | |
597 | { | |
c8eb9690 | 598 | struct smp_chan *smp = conn->smp_chan; |
f4a407be | 599 | bool complete; |
c8eb9690 | 600 | |
f1c09c07 | 601 | BUG_ON(!smp); |
c8eb9690 | 602 | |
4a74d658 | 603 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
f4a407be JH |
604 | mgmt_smp_complete(conn->hcon, complete); |
605 | ||
7ee4ea36 MH |
606 | kfree(smp->csrk); |
607 | kfree(smp->slave_csrk); | |
608 | ||
6a7bd103 JH |
609 | crypto_free_blkcipher(smp->tfm_aes); |
610 | ||
759331d7 JH |
611 | /* If pairing failed clean up any keys we might have */ |
612 | if (!complete) { | |
613 | if (smp->ltk) { | |
614 | list_del(&smp->ltk->list); | |
615 | kfree(smp->ltk); | |
616 | } | |
617 | ||
618 | if (smp->slave_ltk) { | |
619 | list_del(&smp->slave_ltk->list); | |
620 | kfree(smp->slave_ltk); | |
621 | } | |
622 | ||
623 | if (smp->remote_irk) { | |
624 | list_del(&smp->remote_irk->list); | |
625 | kfree(smp->remote_irk); | |
626 | } | |
627 | } | |
628 | ||
c8eb9690 BG |
629 | kfree(smp); |
630 | conn->smp_chan = NULL; | |
76a68ba0 | 631 | hci_conn_drop(conn->hcon); |
8aab4757 VCG |
632 | } |
633 | ||
2b64d153 BG |
634 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
635 | { | |
b10e8017 | 636 | struct l2cap_conn *conn = hcon->l2cap_data; |
2b64d153 BG |
637 | struct smp_chan *smp; |
638 | u32 value; | |
2b64d153 BG |
639 | |
640 | BT_DBG(""); | |
641 | ||
642ac774 | 642 | if (!conn || !test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
2b64d153 BG |
643 | return -ENOTCONN; |
644 | ||
645 | smp = conn->smp_chan; | |
646 | ||
647 | switch (mgmt_op) { | |
648 | case MGMT_OP_USER_PASSKEY_REPLY: | |
649 | value = le32_to_cpu(passkey); | |
943a732a | 650 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 651 | BT_DBG("PassKey: %d", value); |
943a732a | 652 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
653 | /* Fall Through */ |
654 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 655 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
656 | break; |
657 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
658 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 659 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
660 | return 0; |
661 | default: | |
84794e11 | 662 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
663 | return -EOPNOTSUPP; |
664 | } | |
665 | ||
666 | /* If it is our turn to send Pairing Confirm, do so now */ | |
1cc61144 JH |
667 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
668 | u8 rsp = smp_confirm(smp); | |
669 | if (rsp) | |
670 | smp_failure(conn, rsp); | |
671 | } | |
2b64d153 BG |
672 | |
673 | return 0; | |
674 | } | |
675 | ||
da85e5e5 | 676 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 677 | { |
3158c50c | 678 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
b3c6410b | 679 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 680 | struct smp_chan *smp; |
c7262e71 | 681 | u8 key_size, auth, sec_level; |
8aab4757 | 682 | int ret; |
88ba43b6 AB |
683 | |
684 | BT_DBG("conn %p", conn); | |
685 | ||
c46b98be | 686 | if (skb->len < sizeof(*req)) |
38e4a915 | 687 | return SMP_INVALID_PARAMS; |
c46b98be | 688 | |
40bef302 | 689 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
690 | return SMP_CMD_NOTSUPP; |
691 | ||
51a8efd7 | 692 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
8aab4757 | 693 | smp = smp_chan_create(conn); |
d08fd0e7 AE |
694 | else |
695 | smp = conn->smp_chan; | |
8aab4757 | 696 | |
d08fd0e7 AE |
697 | if (!smp) |
698 | return SMP_UNSPECIFIED; | |
d26a2345 | 699 | |
b3c6410b JH |
700 | if (!test_bit(HCI_PAIRABLE, &hdev->dev_flags) && |
701 | (req->auth_req & SMP_AUTH_BONDING)) | |
702 | return SMP_PAIRING_NOTSUPP; | |
703 | ||
1c1def09 VCG |
704 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
705 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 706 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 707 | |
2b64d153 | 708 | /* We didn't start the pairing, so match remote */ |
1ef35827 | 709 | auth = req->auth_req; |
da85e5e5 | 710 | |
c7262e71 JH |
711 | sec_level = authreq_to_seclevel(auth); |
712 | if (sec_level > conn->hcon->pending_sec_level) | |
713 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 714 | |
2ed8f65c JH |
715 | /* If we need MITM check that it can be acheived */ |
716 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
717 | u8 method; | |
718 | ||
719 | method = get_auth_method(smp, conn->hcon->io_capability, | |
720 | req->io_capability); | |
721 | if (method == JUST_WORKS || method == JUST_CFM) | |
722 | return SMP_AUTH_REQUIREMENTS; | |
723 | } | |
724 | ||
2b64d153 | 725 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
726 | |
727 | key_size = min(req->max_key_size, rsp.max_key_size); | |
728 | if (check_enc_key_size(conn, key_size)) | |
729 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 730 | |
e84a6b13 | 731 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 732 | |
1c1def09 VCG |
733 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
734 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 735 | |
3158c50c | 736 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 737 | |
2b64d153 BG |
738 | /* Request setup of TK */ |
739 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
740 | if (ret) | |
741 | return SMP_UNSPECIFIED; | |
742 | ||
da85e5e5 | 743 | return 0; |
88ba43b6 AB |
744 | } |
745 | ||
da85e5e5 | 746 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 747 | { |
3158c50c | 748 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
1c1def09 | 749 | struct smp_chan *smp = conn->smp_chan; |
2b64d153 | 750 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 751 | int ret; |
88ba43b6 AB |
752 | |
753 | BT_DBG("conn %p", conn); | |
754 | ||
c46b98be | 755 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 756 | return SMP_INVALID_PARAMS; |
c46b98be | 757 | |
40bef302 | 758 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
759 | return SMP_CMD_NOTSUPP; |
760 | ||
3158c50c VCG |
761 | skb_pull(skb, sizeof(*rsp)); |
762 | ||
1c1def09 | 763 | req = (void *) &smp->preq[1]; |
da85e5e5 | 764 | |
3158c50c VCG |
765 | key_size = min(req->max_key_size, rsp->max_key_size); |
766 | if (check_enc_key_size(conn, key_size)) | |
767 | return SMP_ENC_KEY_SIZE; | |
768 | ||
2ed8f65c JH |
769 | /* If we need MITM check that it can be acheived */ |
770 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
771 | u8 method; | |
772 | ||
773 | method = get_auth_method(smp, req->io_capability, | |
774 | rsp->io_capability); | |
775 | if (method == JUST_WORKS || method == JUST_CFM) | |
776 | return SMP_AUTH_REQUIREMENTS; | |
777 | } | |
778 | ||
e84a6b13 | 779 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 780 | |
8aab4757 VCG |
781 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
782 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 783 | |
fdcc4bec JH |
784 | /* Update remote key distribution in case the remote cleared |
785 | * some bits that we had enabled in our request. | |
786 | */ | |
787 | smp->remote_key_dist &= rsp->resp_key_dist; | |
788 | ||
2b64d153 | 789 | if ((req->auth_req & SMP_AUTH_BONDING) && |
f1560463 | 790 | (rsp->auth_req & SMP_AUTH_BONDING)) |
2b64d153 BG |
791 | auth = SMP_AUTH_BONDING; |
792 | ||
793 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
794 | ||
476585ec | 795 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
796 | if (ret) |
797 | return SMP_UNSPECIFIED; | |
798 | ||
4a74d658 | 799 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
800 | |
801 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 802 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 803 | return smp_confirm(smp); |
da85e5e5 VCG |
804 | |
805 | return 0; | |
88ba43b6 AB |
806 | } |
807 | ||
da85e5e5 | 808 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 809 | { |
1c1def09 | 810 | struct smp_chan *smp = conn->smp_chan; |
7d24ddcc | 811 | |
88ba43b6 AB |
812 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
813 | ||
c46b98be | 814 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 815 | return SMP_INVALID_PARAMS; |
c46b98be | 816 | |
1c1def09 VCG |
817 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
818 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 819 | |
943a732a JH |
820 | if (conn->hcon->out) |
821 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
822 | smp->prnd); | |
4a74d658 | 823 | else if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 824 | return smp_confirm(smp); |
943a732a | 825 | else |
4a74d658 | 826 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
827 | |
828 | return 0; | |
88ba43b6 AB |
829 | } |
830 | ||
da85e5e5 | 831 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 832 | { |
1c1def09 | 833 | struct smp_chan *smp = conn->smp_chan; |
7d24ddcc | 834 | |
8aab4757 | 835 | BT_DBG("conn %p", conn); |
3158c50c | 836 | |
c46b98be | 837 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 838 | return SMP_INVALID_PARAMS; |
c46b98be | 839 | |
943a732a | 840 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 841 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 842 | |
861580a9 | 843 | return smp_random(smp); |
88ba43b6 AB |
844 | } |
845 | ||
f81cd823 | 846 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 847 | { |
c9839a11 | 848 | struct smp_ltk *key; |
988c5997 VCG |
849 | struct hci_conn *hcon = conn->hcon; |
850 | ||
98a0b845 JH |
851 | key = hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, |
852 | hcon->out); | |
988c5997 | 853 | if (!key) |
f81cd823 | 854 | return false; |
988c5997 | 855 | |
4dab7864 | 856 | if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) |
f81cd823 | 857 | return false; |
4dab7864 | 858 | |
51a8efd7 | 859 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 860 | return true; |
988c5997 | 861 | |
c9839a11 VCG |
862 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
863 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 864 | |
fe59a05f JH |
865 | /* We never store STKs for master role, so clear this flag */ |
866 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
867 | ||
f81cd823 | 868 | return true; |
988c5997 | 869 | } |
f1560463 | 870 | |
854f4727 JH |
871 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level) |
872 | { | |
873 | if (sec_level == BT_SECURITY_LOW) | |
874 | return true; | |
875 | ||
9ab65d60 JH |
876 | /* If we're encrypted with an STK always claim insufficient |
877 | * security. This way we allow the connection to be re-encrypted | |
878 | * with an LTK, even if the LTK provides the same level of | |
b2d5e254 JH |
879 | * security. Only exception is if we don't have an LTK (e.g. |
880 | * because of key distribution bits). | |
9ab65d60 | 881 | */ |
b2d5e254 JH |
882 | if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && |
883 | hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, | |
884 | hcon->out)) | |
9ab65d60 JH |
885 | return false; |
886 | ||
854f4727 JH |
887 | if (hcon->sec_level >= sec_level) |
888 | return true; | |
889 | ||
890 | return false; | |
891 | } | |
892 | ||
da85e5e5 | 893 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
894 | { |
895 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
896 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 897 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 898 | struct smp_chan *smp; |
c7262e71 | 899 | u8 sec_level; |
88ba43b6 AB |
900 | |
901 | BT_DBG("conn %p", conn); | |
902 | ||
c46b98be | 903 | if (skb->len < sizeof(*rp)) |
38e4a915 | 904 | return SMP_INVALID_PARAMS; |
c46b98be | 905 | |
40bef302 | 906 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
907 | return SMP_CMD_NOTSUPP; |
908 | ||
c7262e71 | 909 | sec_level = authreq_to_seclevel(rp->auth_req); |
854f4727 JH |
910 | if (smp_sufficient_security(hcon, sec_level)) |
911 | return 0; | |
912 | ||
c7262e71 JH |
913 | if (sec_level > hcon->pending_sec_level) |
914 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 915 | |
4dab7864 | 916 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
917 | return 0; |
918 | ||
51a8efd7 | 919 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
da85e5e5 | 920 | return 0; |
f1cb9af5 | 921 | |
b3c6410b JH |
922 | if (!test_bit(HCI_PAIRABLE, &hcon->hdev->dev_flags) && |
923 | (rp->auth_req & SMP_AUTH_BONDING)) | |
924 | return SMP_PAIRING_NOTSUPP; | |
925 | ||
8aab4757 | 926 | smp = smp_chan_create(conn); |
c29d2444 JH |
927 | if (!smp) |
928 | return SMP_UNSPECIFIED; | |
d26a2345 | 929 | |
88ba43b6 | 930 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 931 | |
da85e5e5 | 932 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 933 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 934 | |
1c1def09 VCG |
935 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
936 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 937 | |
88ba43b6 | 938 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 939 | |
da85e5e5 | 940 | return 0; |
88ba43b6 AB |
941 | } |
942 | ||
cc110922 | 943 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 944 | { |
cc110922 | 945 | struct l2cap_conn *conn = hcon->l2cap_data; |
0a66cf20 | 946 | struct smp_chan *smp; |
2b64d153 | 947 | __u8 authreq; |
eb492e01 | 948 | |
3a0259bb VCG |
949 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
950 | ||
0a66cf20 JH |
951 | /* This may be NULL if there's an unexpected disconnection */ |
952 | if (!conn) | |
953 | return 1; | |
954 | ||
757aee0f | 955 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
956 | return 1; |
957 | ||
ad32a2f5 | 958 | if (smp_sufficient_security(hcon, sec_level)) |
eb492e01 | 959 | return 1; |
f1cb9af5 | 960 | |
c7262e71 JH |
961 | if (sec_level > hcon->pending_sec_level) |
962 | hcon->pending_sec_level = sec_level; | |
963 | ||
40bef302 | 964 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
965 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
966 | return 0; | |
d26a2345 | 967 | |
51a8efd7 | 968 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
969 | return 0; |
970 | ||
8aab4757 | 971 | smp = smp_chan_create(conn); |
2b64d153 BG |
972 | if (!smp) |
973 | return 1; | |
974 | ||
975 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 976 | |
79897d20 JH |
977 | /* Require MITM if IO Capability allows or the security level |
978 | * requires it. | |
2e233644 | 979 | */ |
79897d20 | 980 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 981 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
982 | authreq |= SMP_AUTH_MITM; |
983 | ||
40bef302 | 984 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 985 | struct smp_cmd_pairing cp; |
f01ead31 | 986 | |
2b64d153 | 987 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
988 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
989 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 990 | |
eb492e01 AB |
991 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
992 | } else { | |
993 | struct smp_cmd_security_req cp; | |
2b64d153 | 994 | cp.auth_req = authreq; |
eb492e01 AB |
995 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
996 | } | |
997 | ||
4a74d658 | 998 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
edca792c | 999 | |
eb492e01 AB |
1000 | return 0; |
1001 | } | |
1002 | ||
7034b911 VCG |
1003 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1004 | { | |
16b90839 | 1005 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
1c1def09 | 1006 | struct smp_chan *smp = conn->smp_chan; |
16b90839 | 1007 | |
c46b98be JH |
1008 | BT_DBG("conn %p", conn); |
1009 | ||
1010 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1011 | return SMP_INVALID_PARAMS; |
c46b98be | 1012 | |
6131ddc8 JH |
1013 | /* Ignore this PDU if it wasn't requested */ |
1014 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1015 | return 0; | |
1016 | ||
16b90839 VCG |
1017 | skb_pull(skb, sizeof(*rp)); |
1018 | ||
1c1def09 | 1019 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1020 | |
7034b911 VCG |
1021 | return 0; |
1022 | } | |
1023 | ||
1024 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1025 | { | |
16b90839 | 1026 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
1c1def09 | 1027 | struct smp_chan *smp = conn->smp_chan; |
c9839a11 VCG |
1028 | struct hci_dev *hdev = conn->hcon->hdev; |
1029 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1030 | struct smp_ltk *ltk; |
c9839a11 | 1031 | u8 authenticated; |
16b90839 | 1032 | |
c46b98be JH |
1033 | BT_DBG("conn %p", conn); |
1034 | ||
1035 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1036 | return SMP_INVALID_PARAMS; |
c46b98be | 1037 | |
6131ddc8 JH |
1038 | /* Ignore this PDU if it wasn't requested */ |
1039 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1040 | return 0; | |
1041 | ||
9747a9f3 JH |
1042 | /* Mark the information as received */ |
1043 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1044 | ||
16b90839 | 1045 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1046 | |
c9839a11 | 1047 | hci_dev_lock(hdev); |
ce39fb4e | 1048 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1049 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1050 | authenticated, smp->tk, smp->enc_key_size, |
1051 | rp->ediv, rp->rand); | |
1052 | smp->ltk = ltk; | |
fd349c02 | 1053 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) |
4bd6d38e | 1054 | smp_distribute_keys(conn); |
c9839a11 | 1055 | hci_dev_unlock(hdev); |
7034b911 VCG |
1056 | |
1057 | return 0; | |
1058 | } | |
1059 | ||
fd349c02 JH |
1060 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1061 | { | |
1062 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
1063 | struct smp_chan *smp = conn->smp_chan; | |
1064 | ||
1065 | BT_DBG(""); | |
1066 | ||
1067 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1068 | return SMP_INVALID_PARAMS; |
fd349c02 | 1069 | |
6131ddc8 JH |
1070 | /* Ignore this PDU if it wasn't requested */ |
1071 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1072 | return 0; | |
1073 | ||
fd349c02 JH |
1074 | skb_pull(skb, sizeof(*info)); |
1075 | ||
1076 | memcpy(smp->irk, info->irk, 16); | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1082 | struct sk_buff *skb) | |
1083 | { | |
1084 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
1085 | struct smp_chan *smp = conn->smp_chan; | |
1086 | struct hci_conn *hcon = conn->hcon; | |
1087 | bdaddr_t rpa; | |
1088 | ||
1089 | BT_DBG(""); | |
1090 | ||
1091 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1092 | return SMP_INVALID_PARAMS; |
fd349c02 | 1093 | |
6131ddc8 JH |
1094 | /* Ignore this PDU if it wasn't requested */ |
1095 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1096 | return 0; | |
1097 | ||
9747a9f3 JH |
1098 | /* Mark the information as received */ |
1099 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1100 | ||
fd349c02 JH |
1101 | skb_pull(skb, sizeof(*info)); |
1102 | ||
31dd624e JH |
1103 | hci_dev_lock(hcon->hdev); |
1104 | ||
a9a58f86 JH |
1105 | /* Strictly speaking the Core Specification (4.1) allows sending |
1106 | * an empty address which would force us to rely on just the IRK | |
1107 | * as "identity information". However, since such | |
1108 | * implementations are not known of and in order to not over | |
1109 | * complicate our implementation, simply pretend that we never | |
1110 | * received an IRK for such a device. | |
1111 | */ | |
1112 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1113 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1114 | goto distribute; |
a9a58f86 JH |
1115 | } |
1116 | ||
fd349c02 JH |
1117 | bacpy(&smp->id_addr, &info->bdaddr); |
1118 | smp->id_addr_type = info->addr_type; | |
1119 | ||
1120 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1121 | bacpy(&rpa, &hcon->dst); | |
1122 | else | |
1123 | bacpy(&rpa, BDADDR_ANY); | |
1124 | ||
23d0e128 JH |
1125 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1126 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1127 | |
31dd624e | 1128 | distribute: |
4bd6d38e | 1129 | smp_distribute_keys(conn); |
fd349c02 | 1130 | |
31dd624e JH |
1131 | hci_dev_unlock(hcon->hdev); |
1132 | ||
fd349c02 JH |
1133 | return 0; |
1134 | } | |
1135 | ||
7ee4ea36 MH |
1136 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1137 | { | |
1138 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
1139 | struct smp_chan *smp = conn->smp_chan; | |
1140 | struct hci_dev *hdev = conn->hcon->hdev; | |
1141 | struct smp_csrk *csrk; | |
1142 | ||
1143 | BT_DBG("conn %p", conn); | |
1144 | ||
1145 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1146 | return SMP_INVALID_PARAMS; |
7ee4ea36 MH |
1147 | |
1148 | /* Ignore this PDU if it wasn't requested */ | |
1149 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1150 | return 0; | |
1151 | ||
1152 | /* Mark the information as received */ | |
1153 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1154 | ||
1155 | skb_pull(skb, sizeof(*rp)); | |
1156 | ||
1157 | hci_dev_lock(hdev); | |
1158 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1159 | if (csrk) { | |
1160 | csrk->master = 0x01; | |
1161 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1162 | } | |
1163 | smp->csrk = csrk; | |
1164 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1165 | smp_distribute_keys(conn); | |
1166 | hci_dev_unlock(hdev); | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
eb492e01 AB |
1171 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
1172 | { | |
7b9899db | 1173 | struct hci_conn *hcon = conn->hcon; |
92381f5c | 1174 | __u8 code, reason; |
eb492e01 AB |
1175 | int err = 0; |
1176 | ||
7b9899db MH |
1177 | if (hcon->type != LE_LINK) { |
1178 | kfree_skb(skb); | |
3432711f | 1179 | return 0; |
7b9899db MH |
1180 | } |
1181 | ||
92381f5c MH |
1182 | if (skb->len < 1) { |
1183 | kfree_skb(skb); | |
1184 | return -EILSEQ; | |
1185 | } | |
1186 | ||
06ae3314 | 1187 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1188 | err = -ENOTSUPP; |
1189 | reason = SMP_PAIRING_NOTSUPP; | |
1190 | goto done; | |
1191 | } | |
1192 | ||
92381f5c | 1193 | code = skb->data[0]; |
eb492e01 AB |
1194 | skb_pull(skb, sizeof(code)); |
1195 | ||
8cf9fa12 JH |
1196 | /* |
1197 | * The SMP context must be initialized for all other PDUs except | |
1198 | * pairing and security requests. If we get any other PDU when | |
1199 | * not initialized simply disconnect (done if this function | |
1200 | * returns an error). | |
1201 | */ | |
1202 | if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && | |
1203 | !conn->smp_chan) { | |
1204 | BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); | |
1205 | kfree_skb(skb); | |
1206 | return -ENOTSUPP; | |
1207 | } | |
1208 | ||
eb492e01 AB |
1209 | switch (code) { |
1210 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1211 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1212 | break; |
1213 | ||
1214 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1215 | smp_failure(conn, 0); |
da85e5e5 VCG |
1216 | reason = 0; |
1217 | err = -EPERM; | |
eb492e01 AB |
1218 | break; |
1219 | ||
1220 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1221 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1222 | break; |
1223 | ||
1224 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1225 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1226 | break; |
1227 | ||
eb492e01 | 1228 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1229 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1230 | break; |
1231 | ||
eb492e01 | 1232 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1233 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1234 | break; |
1235 | ||
eb492e01 | 1236 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1237 | reason = smp_cmd_encrypt_info(conn, skb); |
1238 | break; | |
1239 | ||
eb492e01 | 1240 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1241 | reason = smp_cmd_master_ident(conn, skb); |
1242 | break; | |
1243 | ||
eb492e01 | 1244 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1245 | reason = smp_cmd_ident_info(conn, skb); |
1246 | break; | |
1247 | ||
eb492e01 | 1248 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1249 | reason = smp_cmd_ident_addr_info(conn, skb); |
1250 | break; | |
1251 | ||
eb492e01 | 1252 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1253 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1254 | break; |
1255 | ||
eb492e01 AB |
1256 | default: |
1257 | BT_DBG("Unknown command code 0x%2.2x", code); | |
1258 | ||
1259 | reason = SMP_CMD_NOTSUPP; | |
eb492e01 | 1260 | err = -EOPNOTSUPP; |
3a0259bb | 1261 | goto done; |
eb492e01 AB |
1262 | } |
1263 | ||
3a0259bb VCG |
1264 | done: |
1265 | if (reason) | |
84794e11 | 1266 | smp_failure(conn, reason); |
3a0259bb | 1267 | |
eb492e01 AB |
1268 | kfree_skb(skb); |
1269 | return err; | |
1270 | } | |
7034b911 | 1271 | |
35d70271 JH |
1272 | static void smp_notify_keys(struct l2cap_conn *conn) |
1273 | { | |
1274 | struct smp_chan *smp = conn->smp_chan; | |
1275 | struct hci_conn *hcon = conn->hcon; | |
1276 | struct hci_dev *hdev = hcon->hdev; | |
53ac6ab6 MH |
1277 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; |
1278 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1279 | bool persistent; | |
35d70271 | 1280 | |
61b1a7fb | 1281 | if (smp->remote_irk) { |
95fbac8a | 1282 | mgmt_new_irk(hdev, smp->remote_irk); |
61b1a7fb JH |
1283 | /* Now that user space can be considered to know the |
1284 | * identity address track the connection based on it | |
1285 | * from now on. | |
1286 | */ | |
1287 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1288 | hcon->dst_type = smp->remote_irk->addr_type; | |
1289 | l2cap_conn_update_id_addr(hcon); | |
1290 | } | |
95fbac8a | 1291 | |
53ac6ab6 MH |
1292 | /* The LTKs and CSRKs should be persistent only if both sides |
1293 | * had the bonding bit set in their authentication requests. | |
1294 | */ | |
1295 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
1296 | ||
7ee4ea36 MH |
1297 | if (smp->csrk) { |
1298 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1299 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1300 | mgmt_new_csrk(hdev, smp->csrk, persistent); |
7ee4ea36 MH |
1301 | } |
1302 | ||
1303 | if (smp->slave_csrk) { | |
1304 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1305 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1306 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); |
7ee4ea36 MH |
1307 | } |
1308 | ||
35d70271 JH |
1309 | if (smp->ltk) { |
1310 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1311 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1312 | mgmt_new_ltk(hdev, smp->ltk, persistent); |
35d70271 JH |
1313 | } |
1314 | ||
1315 | if (smp->slave_ltk) { | |
1316 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1317 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1318 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); |
35d70271 JH |
1319 | } |
1320 | } | |
1321 | ||
4bd6d38e | 1322 | int smp_distribute_keys(struct l2cap_conn *conn) |
7034b911 VCG |
1323 | { |
1324 | struct smp_cmd_pairing *req, *rsp; | |
1c1def09 | 1325 | struct smp_chan *smp = conn->smp_chan; |
524237cb JH |
1326 | struct hci_conn *hcon = conn->hcon; |
1327 | struct hci_dev *hdev = hcon->hdev; | |
7034b911 VCG |
1328 | __u8 *keydist; |
1329 | ||
4bd6d38e | 1330 | BT_DBG("conn %p", conn); |
7034b911 | 1331 | |
524237cb | 1332 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
1333 | return 0; |
1334 | ||
1c1def09 | 1335 | rsp = (void *) &smp->prsp[1]; |
7034b911 VCG |
1336 | |
1337 | /* The responder sends its keys first */ | |
efabba37 | 1338 | if (hcon->out && (smp->remote_key_dist & 0x07)) |
7034b911 VCG |
1339 | return 0; |
1340 | ||
1c1def09 | 1341 | req = (void *) &smp->preq[1]; |
7034b911 | 1342 | |
524237cb | 1343 | if (hcon->out) { |
7034b911 VCG |
1344 | keydist = &rsp->init_key_dist; |
1345 | *keydist &= req->init_key_dist; | |
1346 | } else { | |
1347 | keydist = &rsp->resp_key_dist; | |
1348 | *keydist &= req->resp_key_dist; | |
1349 | } | |
1350 | ||
7034b911 VCG |
1351 | BT_DBG("keydist 0x%x", *keydist); |
1352 | ||
1353 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1354 | struct smp_cmd_encrypt_info enc; | |
1355 | struct smp_cmd_master_ident ident; | |
23d0e128 | 1356 | struct smp_ltk *ltk; |
c9839a11 | 1357 | u8 authenticated; |
7034b911 | 1358 | __le16 ediv; |
fe39c7b2 | 1359 | __le64 rand; |
7034b911 VCG |
1360 | |
1361 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
1362 | get_random_bytes(&ediv, sizeof(ediv)); | |
fe39c7b2 | 1363 | get_random_bytes(&rand, sizeof(rand)); |
7034b911 VCG |
1364 | |
1365 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1366 | ||
c9839a11 | 1367 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; |
524237cb | 1368 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1369 | SMP_LTK_SLAVE, authenticated, enc.ltk, |
fe39c7b2 | 1370 | smp->enc_key_size, ediv, rand); |
23d0e128 | 1371 | smp->slave_ltk = ltk; |
16b90839 | 1372 | |
58115373 | 1373 | ident.ediv = ediv; |
fe39c7b2 | 1374 | ident.rand = rand; |
7034b911 VCG |
1375 | |
1376 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1377 | ||
1378 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1379 | } | |
1380 | ||
1381 | if (*keydist & SMP_DIST_ID_KEY) { | |
1382 | struct smp_cmd_ident_addr_info addrinfo; | |
1383 | struct smp_cmd_ident_info idinfo; | |
1384 | ||
863efaf2 | 1385 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); |
7034b911 VCG |
1386 | |
1387 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1388 | ||
82d4b359 JH |
1389 | /* The hci_conn contains the local identity address |
1390 | * after the connection has been established. | |
1391 | * | |
1392 | * This is true even when the connection has been | |
1393 | * established using a resolvable random address. | |
1394 | */ | |
524237cb | 1395 | bacpy(&addrinfo.bdaddr, &hcon->src); |
82d4b359 | 1396 | addrinfo.addr_type = hcon->src_type; |
7034b911 VCG |
1397 | |
1398 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
f1560463 | 1399 | &addrinfo); |
7034b911 VCG |
1400 | |
1401 | *keydist &= ~SMP_DIST_ID_KEY; | |
1402 | } | |
1403 | ||
1404 | if (*keydist & SMP_DIST_SIGN) { | |
1405 | struct smp_cmd_sign_info sign; | |
7ee4ea36 | 1406 | struct smp_csrk *csrk; |
7034b911 | 1407 | |
7ee4ea36 | 1408 | /* Generate a new random key */ |
7034b911 VCG |
1409 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); |
1410 | ||
7ee4ea36 MH |
1411 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
1412 | if (csrk) { | |
1413 | csrk->master = 0x00; | |
1414 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
1415 | } | |
1416 | smp->slave_csrk = csrk; | |
1417 | ||
7034b911 VCG |
1418 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); |
1419 | ||
1420 | *keydist &= ~SMP_DIST_SIGN; | |
1421 | } | |
1422 | ||
efabba37 JH |
1423 | /* If there are still keys to be received wait for them */ |
1424 | if ((smp->remote_key_dist & 0x07)) | |
1425 | return 0; | |
1426 | ||
1d98bf4f JH |
1427 | clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags); |
1428 | cancel_delayed_work_sync(&conn->security_timer); | |
4a74d658 | 1429 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1d98bf4f | 1430 | smp_notify_keys(conn); |
efabba37 | 1431 | |
1d98bf4f | 1432 | smp_chan_destroy(conn); |
d26a2345 | 1433 | |
7034b911 VCG |
1434 | return 0; |
1435 | } |