Commit | Line | Data |
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eb492e01 AB |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License version 2 as | |
7 | published by the Free Software Foundation; | |
8 | ||
9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 | ||
18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
20 | SOFTWARE IS DISCLAIMED. | |
21 | */ | |
22 | ||
8c520a59 GP |
23 | #include <linux/crypto.h> |
24 | #include <linux/scatterlist.h> | |
25 | #include <crypto/b128ops.h> | |
26 | ||
eb492e01 AB |
27 | #include <net/bluetooth/bluetooth.h> |
28 | #include <net/bluetooth/hci_core.h> | |
29 | #include <net/bluetooth/l2cap.h> | |
2b64d153 | 30 | #include <net/bluetooth/mgmt.h> |
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 | |
b6ae8457 | 310 | if (test_bit(HCI_BONDABLE, &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 | ||
02f3e254 JH |
434 | /* Don't bother user space with no IO capabilities */ |
435 | if (method == JUST_CFM && hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT) | |
436 | method = JUST_WORKS; | |
437 | ||
2b64d153 BG |
438 | /* If Just Works, Continue with Zero TK */ |
439 | if (method == JUST_WORKS) { | |
4a74d658 | 440 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
441 | return 0; |
442 | } | |
443 | ||
444 | /* Not Just Works/Confirm results in MITM Authentication */ | |
445 | if (method != JUST_CFM) | |
4a74d658 | 446 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
2b64d153 BG |
447 | |
448 | /* If both devices have Keyoard-Display I/O, the master | |
449 | * Confirms and the slave Enters the passkey. | |
450 | */ | |
451 | if (method == OVERLAP) { | |
40bef302 | 452 | if (hcon->role == HCI_ROLE_MASTER) |
2b64d153 BG |
453 | method = CFM_PASSKEY; |
454 | else | |
455 | method = REQ_PASSKEY; | |
456 | } | |
457 | ||
01ad34d2 | 458 | /* Generate random passkey. */ |
2b64d153 | 459 | if (method == CFM_PASSKEY) { |
943a732a | 460 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
461 | get_random_bytes(&passkey, sizeof(passkey)); |
462 | passkey %= 1000000; | |
943a732a | 463 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 464 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 465 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
466 | } |
467 | ||
468 | hci_dev_lock(hcon->hdev); | |
469 | ||
470 | if (method == REQ_PASSKEY) | |
ce39fb4e | 471 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 472 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
473 | else if (method == JUST_CFM) |
474 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
475 | hcon->type, hcon->dst_type, | |
476 | passkey, 1); | |
2b64d153 | 477 | else |
01ad34d2 | 478 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 479 | hcon->type, hcon->dst_type, |
39adbffe | 480 | passkey, 0); |
2b64d153 BG |
481 | |
482 | hci_dev_unlock(hcon->hdev); | |
483 | ||
484 | return ret; | |
485 | } | |
486 | ||
1cc61144 | 487 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 488 | { |
8aab4757 | 489 | struct l2cap_conn *conn = smp->conn; |
8aab4757 VCG |
490 | struct smp_cmd_pairing_confirm cp; |
491 | int ret; | |
8aab4757 VCG |
492 | |
493 | BT_DBG("conn %p", conn); | |
494 | ||
ec70f36f | 495 | ret = smp_c1(smp, smp->tk, smp->prnd, smp->preq, smp->prsp, |
b1cd5fd9 | 496 | conn->hcon->init_addr_type, &conn->hcon->init_addr, |
943a732a JH |
497 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
498 | cp.confirm_val); | |
1cc61144 JH |
499 | if (ret) |
500 | return SMP_UNSPECIFIED; | |
8aab4757 | 501 | |
4a74d658 | 502 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 503 | |
8aab4757 VCG |
504 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
505 | ||
1cc61144 | 506 | return 0; |
8aab4757 VCG |
507 | } |
508 | ||
861580a9 | 509 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 510 | { |
8aab4757 VCG |
511 | struct l2cap_conn *conn = smp->conn; |
512 | struct hci_conn *hcon = conn->hcon; | |
861580a9 | 513 | u8 confirm[16]; |
8aab4757 VCG |
514 | int ret; |
515 | ||
ec70f36f | 516 | if (IS_ERR_OR_NULL(smp->tfm_aes)) |
861580a9 | 517 | return SMP_UNSPECIFIED; |
8aab4757 VCG |
518 | |
519 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
520 | ||
ec70f36f | 521 | ret = smp_c1(smp, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
b1cd5fd9 | 522 | hcon->init_addr_type, &hcon->init_addr, |
943a732a | 523 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
861580a9 JH |
524 | if (ret) |
525 | return SMP_UNSPECIFIED; | |
8aab4757 | 526 | |
8aab4757 VCG |
527 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
528 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 529 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
530 | } |
531 | ||
532 | if (hcon->out) { | |
fe39c7b2 MH |
533 | u8 stk[16]; |
534 | __le64 rand = 0; | |
535 | __le16 ediv = 0; | |
8aab4757 | 536 | |
ec70f36f | 537 | smp_s1(smp, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 538 | |
f7aa611a | 539 | memset(stk + smp->enc_key_size, 0, |
04124681 | 540 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 541 | |
861580a9 JH |
542 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
543 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
544 | |
545 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 546 | hcon->enc_key_size = smp->enc_key_size; |
fe59a05f | 547 | set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); |
8aab4757 | 548 | } else { |
fff3490f | 549 | u8 stk[16], auth; |
fe39c7b2 MH |
550 | __le64 rand = 0; |
551 | __le16 ediv = 0; | |
8aab4757 | 552 | |
943a732a JH |
553 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
554 | smp->prnd); | |
8aab4757 | 555 | |
ec70f36f | 556 | smp_s1(smp, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 557 | |
f7aa611a | 558 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 559 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 560 | |
fff3490f JH |
561 | if (hcon->pending_sec_level == BT_SECURITY_HIGH) |
562 | auth = 1; | |
563 | else | |
564 | auth = 0; | |
565 | ||
7d5843b7 JH |
566 | /* Even though there's no _SLAVE suffix this is the |
567 | * slave STK we're adding for later lookup (the master | |
568 | * STK never needs to be stored). | |
569 | */ | |
ce39fb4e | 570 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 571 | SMP_STK, auth, stk, smp->enc_key_size, ediv, rand); |
8aab4757 VCG |
572 | } |
573 | ||
861580a9 | 574 | return 0; |
8aab4757 VCG |
575 | } |
576 | ||
577 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) | |
578 | { | |
579 | struct smp_chan *smp; | |
580 | ||
f1560463 | 581 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
616d55be JH |
582 | if (!smp) { |
583 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); | |
8aab4757 | 584 | return NULL; |
616d55be | 585 | } |
8aab4757 | 586 | |
6a7bd103 JH |
587 | smp->tfm_aes = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
588 | if (IS_ERR(smp->tfm_aes)) { | |
589 | BT_ERR("Unable to create ECB crypto context"); | |
590 | kfree(smp); | |
616d55be | 591 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags); |
6a7bd103 JH |
592 | return NULL; |
593 | } | |
594 | ||
8aab4757 VCG |
595 | smp->conn = conn; |
596 | conn->smp_chan = smp; | |
597 | ||
598 | hci_conn_hold(conn->hcon); | |
599 | ||
600 | return smp; | |
601 | } | |
602 | ||
603 | void smp_chan_destroy(struct l2cap_conn *conn) | |
604 | { | |
c8eb9690 | 605 | struct smp_chan *smp = conn->smp_chan; |
f4a407be | 606 | bool complete; |
c8eb9690 | 607 | |
f1c09c07 | 608 | BUG_ON(!smp); |
c8eb9690 | 609 | |
4a74d658 | 610 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
f4a407be JH |
611 | mgmt_smp_complete(conn->hcon, complete); |
612 | ||
7ee4ea36 MH |
613 | kfree(smp->csrk); |
614 | kfree(smp->slave_csrk); | |
615 | ||
6a7bd103 JH |
616 | crypto_free_blkcipher(smp->tfm_aes); |
617 | ||
759331d7 JH |
618 | /* If pairing failed clean up any keys we might have */ |
619 | if (!complete) { | |
620 | if (smp->ltk) { | |
621 | list_del(&smp->ltk->list); | |
622 | kfree(smp->ltk); | |
623 | } | |
624 | ||
625 | if (smp->slave_ltk) { | |
626 | list_del(&smp->slave_ltk->list); | |
627 | kfree(smp->slave_ltk); | |
628 | } | |
629 | ||
630 | if (smp->remote_irk) { | |
631 | list_del(&smp->remote_irk->list); | |
632 | kfree(smp->remote_irk); | |
633 | } | |
634 | } | |
635 | ||
c8eb9690 BG |
636 | kfree(smp); |
637 | conn->smp_chan = NULL; | |
76a68ba0 | 638 | hci_conn_drop(conn->hcon); |
8aab4757 VCG |
639 | } |
640 | ||
2b64d153 BG |
641 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
642 | { | |
b10e8017 | 643 | struct l2cap_conn *conn = hcon->l2cap_data; |
2b64d153 BG |
644 | struct smp_chan *smp; |
645 | u32 value; | |
2b64d153 BG |
646 | |
647 | BT_DBG(""); | |
648 | ||
642ac774 | 649 | if (!conn || !test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
2b64d153 BG |
650 | return -ENOTCONN; |
651 | ||
652 | smp = conn->smp_chan; | |
653 | ||
654 | switch (mgmt_op) { | |
655 | case MGMT_OP_USER_PASSKEY_REPLY: | |
656 | value = le32_to_cpu(passkey); | |
943a732a | 657 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 658 | BT_DBG("PassKey: %d", value); |
943a732a | 659 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
660 | /* Fall Through */ |
661 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 662 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
663 | break; |
664 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
665 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 666 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
667 | return 0; |
668 | default: | |
84794e11 | 669 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
670 | return -EOPNOTSUPP; |
671 | } | |
672 | ||
673 | /* If it is our turn to send Pairing Confirm, do so now */ | |
1cc61144 JH |
674 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
675 | u8 rsp = smp_confirm(smp); | |
676 | if (rsp) | |
677 | smp_failure(conn, rsp); | |
678 | } | |
2b64d153 BG |
679 | |
680 | return 0; | |
681 | } | |
682 | ||
da85e5e5 | 683 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 684 | { |
3158c50c | 685 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
b3c6410b | 686 | struct hci_dev *hdev = conn->hcon->hdev; |
8aab4757 | 687 | struct smp_chan *smp; |
c7262e71 | 688 | u8 key_size, auth, sec_level; |
8aab4757 | 689 | int ret; |
88ba43b6 AB |
690 | |
691 | BT_DBG("conn %p", conn); | |
692 | ||
c46b98be | 693 | if (skb->len < sizeof(*req)) |
38e4a915 | 694 | return SMP_INVALID_PARAMS; |
c46b98be | 695 | |
40bef302 | 696 | if (conn->hcon->role != HCI_ROLE_SLAVE) |
2b64d153 BG |
697 | return SMP_CMD_NOTSUPP; |
698 | ||
51a8efd7 | 699 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
8aab4757 | 700 | smp = smp_chan_create(conn); |
d08fd0e7 AE |
701 | else |
702 | smp = conn->smp_chan; | |
8aab4757 | 703 | |
d08fd0e7 AE |
704 | if (!smp) |
705 | return SMP_UNSPECIFIED; | |
d26a2345 | 706 | |
b6ae8457 | 707 | if (!test_bit(HCI_BONDABLE, &hdev->dev_flags) && |
b3c6410b JH |
708 | (req->auth_req & SMP_AUTH_BONDING)) |
709 | return SMP_PAIRING_NOTSUPP; | |
710 | ||
1c1def09 VCG |
711 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
712 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 713 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 714 | |
2b64d153 | 715 | /* We didn't start the pairing, so match remote */ |
1ef35827 | 716 | auth = req->auth_req; |
da85e5e5 | 717 | |
c7262e71 JH |
718 | sec_level = authreq_to_seclevel(auth); |
719 | if (sec_level > conn->hcon->pending_sec_level) | |
720 | conn->hcon->pending_sec_level = sec_level; | |
fdde0a26 | 721 | |
2ed8f65c JH |
722 | /* If we need MITM check that it can be acheived */ |
723 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
724 | u8 method; | |
725 | ||
726 | method = get_auth_method(smp, conn->hcon->io_capability, | |
727 | req->io_capability); | |
728 | if (method == JUST_WORKS || method == JUST_CFM) | |
729 | return SMP_AUTH_REQUIREMENTS; | |
730 | } | |
731 | ||
2b64d153 | 732 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
733 | |
734 | key_size = min(req->max_key_size, rsp.max_key_size); | |
735 | if (check_enc_key_size(conn, key_size)) | |
736 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 737 | |
e84a6b13 | 738 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 739 | |
1c1def09 VCG |
740 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
741 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 742 | |
3158c50c | 743 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 744 | |
2b64d153 BG |
745 | /* Request setup of TK */ |
746 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
747 | if (ret) | |
748 | return SMP_UNSPECIFIED; | |
749 | ||
da85e5e5 | 750 | return 0; |
88ba43b6 AB |
751 | } |
752 | ||
da85e5e5 | 753 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 754 | { |
3158c50c | 755 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
1c1def09 | 756 | struct smp_chan *smp = conn->smp_chan; |
2b64d153 | 757 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 758 | int ret; |
88ba43b6 AB |
759 | |
760 | BT_DBG("conn %p", conn); | |
761 | ||
c46b98be | 762 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 763 | return SMP_INVALID_PARAMS; |
c46b98be | 764 | |
40bef302 | 765 | if (conn->hcon->role != HCI_ROLE_MASTER) |
2b64d153 BG |
766 | return SMP_CMD_NOTSUPP; |
767 | ||
3158c50c VCG |
768 | skb_pull(skb, sizeof(*rsp)); |
769 | ||
1c1def09 | 770 | req = (void *) &smp->preq[1]; |
da85e5e5 | 771 | |
3158c50c VCG |
772 | key_size = min(req->max_key_size, rsp->max_key_size); |
773 | if (check_enc_key_size(conn, key_size)) | |
774 | return SMP_ENC_KEY_SIZE; | |
775 | ||
2ed8f65c JH |
776 | /* If we need MITM check that it can be acheived */ |
777 | if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) { | |
778 | u8 method; | |
779 | ||
780 | method = get_auth_method(smp, req->io_capability, | |
781 | rsp->io_capability); | |
782 | if (method == JUST_WORKS || method == JUST_CFM) | |
783 | return SMP_AUTH_REQUIREMENTS; | |
784 | } | |
785 | ||
e84a6b13 | 786 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 787 | |
8aab4757 VCG |
788 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
789 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 790 | |
fdcc4bec JH |
791 | /* Update remote key distribution in case the remote cleared |
792 | * some bits that we had enabled in our request. | |
793 | */ | |
794 | smp->remote_key_dist &= rsp->resp_key_dist; | |
795 | ||
2b64d153 | 796 | if ((req->auth_req & SMP_AUTH_BONDING) && |
f1560463 | 797 | (rsp->auth_req & SMP_AUTH_BONDING)) |
2b64d153 BG |
798 | auth = SMP_AUTH_BONDING; |
799 | ||
800 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
801 | ||
476585ec | 802 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
803 | if (ret) |
804 | return SMP_UNSPECIFIED; | |
805 | ||
4a74d658 | 806 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
807 | |
808 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 809 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 810 | return smp_confirm(smp); |
da85e5e5 VCG |
811 | |
812 | return 0; | |
88ba43b6 AB |
813 | } |
814 | ||
da85e5e5 | 815 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 816 | { |
1c1def09 | 817 | struct smp_chan *smp = conn->smp_chan; |
7d24ddcc | 818 | |
88ba43b6 AB |
819 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
820 | ||
c46b98be | 821 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 822 | return SMP_INVALID_PARAMS; |
c46b98be | 823 | |
1c1def09 VCG |
824 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
825 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 826 | |
943a732a JH |
827 | if (conn->hcon->out) |
828 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
829 | smp->prnd); | |
4a74d658 | 830 | else if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 831 | return smp_confirm(smp); |
943a732a | 832 | else |
4a74d658 | 833 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
834 | |
835 | return 0; | |
88ba43b6 AB |
836 | } |
837 | ||
da85e5e5 | 838 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 839 | { |
1c1def09 | 840 | struct smp_chan *smp = conn->smp_chan; |
7d24ddcc | 841 | |
8aab4757 | 842 | BT_DBG("conn %p", conn); |
3158c50c | 843 | |
c46b98be | 844 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 845 | return SMP_INVALID_PARAMS; |
c46b98be | 846 | |
943a732a | 847 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 848 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 849 | |
861580a9 | 850 | return smp_random(smp); |
88ba43b6 AB |
851 | } |
852 | ||
f81cd823 | 853 | static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 854 | { |
c9839a11 | 855 | struct smp_ltk *key; |
988c5997 VCG |
856 | struct hci_conn *hcon = conn->hcon; |
857 | ||
98a0b845 | 858 | key = hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, |
e804d25d | 859 | hcon->role); |
988c5997 | 860 | if (!key) |
f81cd823 | 861 | return false; |
988c5997 | 862 | |
4dab7864 | 863 | if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) |
f81cd823 | 864 | return false; |
4dab7864 | 865 | |
51a8efd7 | 866 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
f81cd823 | 867 | return true; |
988c5997 | 868 | |
c9839a11 VCG |
869 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
870 | hcon->enc_key_size = key->enc_size; | |
988c5997 | 871 | |
fe59a05f JH |
872 | /* We never store STKs for master role, so clear this flag */ |
873 | clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags); | |
874 | ||
f81cd823 | 875 | return true; |
988c5997 | 876 | } |
f1560463 | 877 | |
854f4727 JH |
878 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level) |
879 | { | |
880 | if (sec_level == BT_SECURITY_LOW) | |
881 | return true; | |
882 | ||
9ab65d60 JH |
883 | /* If we're encrypted with an STK always claim insufficient |
884 | * security. This way we allow the connection to be re-encrypted | |
885 | * with an LTK, even if the LTK provides the same level of | |
b2d5e254 JH |
886 | * security. Only exception is if we don't have an LTK (e.g. |
887 | * because of key distribution bits). | |
9ab65d60 | 888 | */ |
b2d5e254 JH |
889 | if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) && |
890 | hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, | |
e804d25d | 891 | hcon->role)) |
9ab65d60 JH |
892 | return false; |
893 | ||
854f4727 JH |
894 | if (hcon->sec_level >= sec_level) |
895 | return true; | |
896 | ||
897 | return false; | |
898 | } | |
899 | ||
da85e5e5 | 900 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
901 | { |
902 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
903 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 904 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 905 | struct smp_chan *smp; |
c7262e71 | 906 | u8 sec_level; |
88ba43b6 AB |
907 | |
908 | BT_DBG("conn %p", conn); | |
909 | ||
c46b98be | 910 | if (skb->len < sizeof(*rp)) |
38e4a915 | 911 | return SMP_INVALID_PARAMS; |
c46b98be | 912 | |
40bef302 | 913 | if (hcon->role != HCI_ROLE_MASTER) |
86ca9eac JH |
914 | return SMP_CMD_NOTSUPP; |
915 | ||
c7262e71 | 916 | sec_level = authreq_to_seclevel(rp->auth_req); |
854f4727 JH |
917 | if (smp_sufficient_security(hcon, sec_level)) |
918 | return 0; | |
919 | ||
c7262e71 JH |
920 | if (sec_level > hcon->pending_sec_level) |
921 | hcon->pending_sec_level = sec_level; | |
feb45eb5 | 922 | |
4dab7864 | 923 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
924 | return 0; |
925 | ||
51a8efd7 | 926 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
da85e5e5 | 927 | return 0; |
f1cb9af5 | 928 | |
8aab4757 | 929 | smp = smp_chan_create(conn); |
c29d2444 JH |
930 | if (!smp) |
931 | return SMP_UNSPECIFIED; | |
d26a2345 | 932 | |
b6ae8457 | 933 | if (!test_bit(HCI_BONDABLE, &hcon->hdev->dev_flags) && |
616d55be JH |
934 | (rp->auth_req & SMP_AUTH_BONDING)) |
935 | return SMP_PAIRING_NOTSUPP; | |
936 | ||
88ba43b6 | 937 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 938 | |
da85e5e5 | 939 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 940 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 941 | |
1c1def09 VCG |
942 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
943 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 944 | |
88ba43b6 | 945 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 946 | |
da85e5e5 | 947 | return 0; |
88ba43b6 AB |
948 | } |
949 | ||
cc110922 | 950 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 951 | { |
cc110922 | 952 | struct l2cap_conn *conn = hcon->l2cap_data; |
0a66cf20 | 953 | struct smp_chan *smp; |
2b64d153 | 954 | __u8 authreq; |
eb492e01 | 955 | |
3a0259bb VCG |
956 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
957 | ||
0a66cf20 JH |
958 | /* This may be NULL if there's an unexpected disconnection */ |
959 | if (!conn) | |
960 | return 1; | |
961 | ||
757aee0f | 962 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
963 | return 1; |
964 | ||
ad32a2f5 | 965 | if (smp_sufficient_security(hcon, sec_level)) |
eb492e01 | 966 | return 1; |
f1cb9af5 | 967 | |
c7262e71 JH |
968 | if (sec_level > hcon->pending_sec_level) |
969 | hcon->pending_sec_level = sec_level; | |
970 | ||
40bef302 | 971 | if (hcon->role == HCI_ROLE_MASTER) |
c7262e71 JH |
972 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
973 | return 0; | |
d26a2345 | 974 | |
51a8efd7 | 975 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
976 | return 0; |
977 | ||
8aab4757 | 978 | smp = smp_chan_create(conn); |
2b64d153 BG |
979 | if (!smp) |
980 | return 1; | |
981 | ||
982 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 983 | |
79897d20 JH |
984 | /* Require MITM if IO Capability allows or the security level |
985 | * requires it. | |
2e233644 | 986 | */ |
79897d20 | 987 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
c7262e71 | 988 | hcon->pending_sec_level > BT_SECURITY_MEDIUM) |
2e233644 JH |
989 | authreq |= SMP_AUTH_MITM; |
990 | ||
40bef302 | 991 | if (hcon->role == HCI_ROLE_MASTER) { |
d26a2345 | 992 | struct smp_cmd_pairing cp; |
f01ead31 | 993 | |
2b64d153 | 994 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
995 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
996 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 997 | |
eb492e01 AB |
998 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
999 | } else { | |
1000 | struct smp_cmd_security_req cp; | |
2b64d153 | 1001 | cp.auth_req = authreq; |
eb492e01 AB |
1002 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
1003 | } | |
1004 | ||
4a74d658 | 1005 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
edca792c | 1006 | |
eb492e01 AB |
1007 | return 0; |
1008 | } | |
1009 | ||
7034b911 VCG |
1010 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1011 | { | |
16b90839 | 1012 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
1c1def09 | 1013 | struct smp_chan *smp = conn->smp_chan; |
16b90839 | 1014 | |
c46b98be JH |
1015 | BT_DBG("conn %p", conn); |
1016 | ||
1017 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1018 | return SMP_INVALID_PARAMS; |
c46b98be | 1019 | |
6131ddc8 JH |
1020 | /* Ignore this PDU if it wasn't requested */ |
1021 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1022 | return 0; | |
1023 | ||
16b90839 VCG |
1024 | skb_pull(skb, sizeof(*rp)); |
1025 | ||
1c1def09 | 1026 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 1027 | |
7034b911 VCG |
1028 | return 0; |
1029 | } | |
1030 | ||
1031 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
1032 | { | |
16b90839 | 1033 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
1c1def09 | 1034 | struct smp_chan *smp = conn->smp_chan; |
c9839a11 VCG |
1035 | struct hci_dev *hdev = conn->hcon->hdev; |
1036 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 1037 | struct smp_ltk *ltk; |
c9839a11 | 1038 | u8 authenticated; |
16b90839 | 1039 | |
c46b98be JH |
1040 | BT_DBG("conn %p", conn); |
1041 | ||
1042 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1043 | return SMP_INVALID_PARAMS; |
c46b98be | 1044 | |
6131ddc8 JH |
1045 | /* Ignore this PDU if it wasn't requested */ |
1046 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
1047 | return 0; | |
1048 | ||
9747a9f3 JH |
1049 | /* Mark the information as received */ |
1050 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
1051 | ||
16b90839 | 1052 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 1053 | |
c9839a11 | 1054 | hci_dev_lock(hdev); |
ce39fb4e | 1055 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
2ceba539 | 1056 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK, |
23d0e128 JH |
1057 | authenticated, smp->tk, smp->enc_key_size, |
1058 | rp->ediv, rp->rand); | |
1059 | smp->ltk = ltk; | |
fd349c02 | 1060 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) |
4bd6d38e | 1061 | smp_distribute_keys(conn); |
c9839a11 | 1062 | hci_dev_unlock(hdev); |
7034b911 VCG |
1063 | |
1064 | return 0; | |
1065 | } | |
1066 | ||
fd349c02 JH |
1067 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1068 | { | |
1069 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
1070 | struct smp_chan *smp = conn->smp_chan; | |
1071 | ||
1072 | BT_DBG(""); | |
1073 | ||
1074 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1075 | return SMP_INVALID_PARAMS; |
fd349c02 | 1076 | |
6131ddc8 JH |
1077 | /* Ignore this PDU if it wasn't requested */ |
1078 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1079 | return 0; | |
1080 | ||
fd349c02 JH |
1081 | skb_pull(skb, sizeof(*info)); |
1082 | ||
1083 | memcpy(smp->irk, info->irk, 16); | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1089 | struct sk_buff *skb) | |
1090 | { | |
1091 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
1092 | struct smp_chan *smp = conn->smp_chan; | |
1093 | struct hci_conn *hcon = conn->hcon; | |
1094 | bdaddr_t rpa; | |
1095 | ||
1096 | BT_DBG(""); | |
1097 | ||
1098 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1099 | return SMP_INVALID_PARAMS; |
fd349c02 | 1100 | |
6131ddc8 JH |
1101 | /* Ignore this PDU if it wasn't requested */ |
1102 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1103 | return 0; | |
1104 | ||
9747a9f3 JH |
1105 | /* Mark the information as received */ |
1106 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1107 | ||
fd349c02 JH |
1108 | skb_pull(skb, sizeof(*info)); |
1109 | ||
31dd624e JH |
1110 | hci_dev_lock(hcon->hdev); |
1111 | ||
a9a58f86 JH |
1112 | /* Strictly speaking the Core Specification (4.1) allows sending |
1113 | * an empty address which would force us to rely on just the IRK | |
1114 | * as "identity information". However, since such | |
1115 | * implementations are not known of and in order to not over | |
1116 | * complicate our implementation, simply pretend that we never | |
1117 | * received an IRK for such a device. | |
1118 | */ | |
1119 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1120 | BT_ERR("Ignoring IRK with no identity address"); | |
31dd624e | 1121 | goto distribute; |
a9a58f86 JH |
1122 | } |
1123 | ||
fd349c02 JH |
1124 | bacpy(&smp->id_addr, &info->bdaddr); |
1125 | smp->id_addr_type = info->addr_type; | |
1126 | ||
1127 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1128 | bacpy(&rpa, &hcon->dst); | |
1129 | else | |
1130 | bacpy(&rpa, BDADDR_ANY); | |
1131 | ||
23d0e128 JH |
1132 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1133 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1134 | |
31dd624e | 1135 | distribute: |
4bd6d38e | 1136 | smp_distribute_keys(conn); |
fd349c02 | 1137 | |
31dd624e JH |
1138 | hci_dev_unlock(hcon->hdev); |
1139 | ||
fd349c02 JH |
1140 | return 0; |
1141 | } | |
1142 | ||
7ee4ea36 MH |
1143 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1144 | { | |
1145 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
1146 | struct smp_chan *smp = conn->smp_chan; | |
1147 | struct hci_dev *hdev = conn->hcon->hdev; | |
1148 | struct smp_csrk *csrk; | |
1149 | ||
1150 | BT_DBG("conn %p", conn); | |
1151 | ||
1152 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1153 | return SMP_INVALID_PARAMS; |
7ee4ea36 MH |
1154 | |
1155 | /* Ignore this PDU if it wasn't requested */ | |
1156 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1157 | return 0; | |
1158 | ||
1159 | /* Mark the information as received */ | |
1160 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1161 | ||
1162 | skb_pull(skb, sizeof(*rp)); | |
1163 | ||
1164 | hci_dev_lock(hdev); | |
1165 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1166 | if (csrk) { | |
1167 | csrk->master = 0x01; | |
1168 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1169 | } | |
1170 | smp->csrk = csrk; | |
1171 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1172 | smp_distribute_keys(conn); | |
1173 | hci_dev_unlock(hdev); | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
eb492e01 AB |
1178 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
1179 | { | |
7b9899db | 1180 | struct hci_conn *hcon = conn->hcon; |
92381f5c | 1181 | __u8 code, reason; |
eb492e01 AB |
1182 | int err = 0; |
1183 | ||
7b9899db MH |
1184 | if (hcon->type != LE_LINK) { |
1185 | kfree_skb(skb); | |
3432711f | 1186 | return 0; |
7b9899db MH |
1187 | } |
1188 | ||
92381f5c MH |
1189 | if (skb->len < 1) { |
1190 | kfree_skb(skb); | |
1191 | return -EILSEQ; | |
1192 | } | |
1193 | ||
06ae3314 | 1194 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
beb19e4c | 1195 | err = -EOPNOTSUPP; |
2e65c9d2 AG |
1196 | reason = SMP_PAIRING_NOTSUPP; |
1197 | goto done; | |
1198 | } | |
1199 | ||
92381f5c | 1200 | code = skb->data[0]; |
eb492e01 AB |
1201 | skb_pull(skb, sizeof(code)); |
1202 | ||
8cf9fa12 JH |
1203 | /* |
1204 | * The SMP context must be initialized for all other PDUs except | |
1205 | * pairing and security requests. If we get any other PDU when | |
1206 | * not initialized simply disconnect (done if this function | |
1207 | * returns an error). | |
1208 | */ | |
1209 | if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && | |
1210 | !conn->smp_chan) { | |
1211 | BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); | |
1212 | kfree_skb(skb); | |
beb19e4c | 1213 | return -EOPNOTSUPP; |
8cf9fa12 JH |
1214 | } |
1215 | ||
eb492e01 AB |
1216 | switch (code) { |
1217 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1218 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1219 | break; |
1220 | ||
1221 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1222 | smp_failure(conn, 0); |
da85e5e5 VCG |
1223 | reason = 0; |
1224 | err = -EPERM; | |
eb492e01 AB |
1225 | break; |
1226 | ||
1227 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1228 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1229 | break; |
1230 | ||
1231 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1232 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1233 | break; |
1234 | ||
eb492e01 | 1235 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1236 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1237 | break; |
1238 | ||
eb492e01 | 1239 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1240 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1241 | break; |
1242 | ||
eb492e01 | 1243 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1244 | reason = smp_cmd_encrypt_info(conn, skb); |
1245 | break; | |
1246 | ||
eb492e01 | 1247 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1248 | reason = smp_cmd_master_ident(conn, skb); |
1249 | break; | |
1250 | ||
eb492e01 | 1251 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1252 | reason = smp_cmd_ident_info(conn, skb); |
1253 | break; | |
1254 | ||
eb492e01 | 1255 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1256 | reason = smp_cmd_ident_addr_info(conn, skb); |
1257 | break; | |
1258 | ||
eb492e01 | 1259 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1260 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1261 | break; |
1262 | ||
eb492e01 AB |
1263 | default: |
1264 | BT_DBG("Unknown command code 0x%2.2x", code); | |
1265 | ||
1266 | reason = SMP_CMD_NOTSUPP; | |
eb492e01 | 1267 | err = -EOPNOTSUPP; |
3a0259bb | 1268 | goto done; |
eb492e01 AB |
1269 | } |
1270 | ||
3a0259bb VCG |
1271 | done: |
1272 | if (reason) | |
84794e11 | 1273 | smp_failure(conn, reason); |
3a0259bb | 1274 | |
eb492e01 AB |
1275 | kfree_skb(skb); |
1276 | return err; | |
1277 | } | |
7034b911 | 1278 | |
35d70271 JH |
1279 | static void smp_notify_keys(struct l2cap_conn *conn) |
1280 | { | |
1281 | struct smp_chan *smp = conn->smp_chan; | |
1282 | struct hci_conn *hcon = conn->hcon; | |
1283 | struct hci_dev *hdev = hcon->hdev; | |
53ac6ab6 MH |
1284 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; |
1285 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1286 | bool persistent; | |
35d70271 | 1287 | |
61b1a7fb | 1288 | if (smp->remote_irk) { |
95fbac8a | 1289 | mgmt_new_irk(hdev, smp->remote_irk); |
61b1a7fb JH |
1290 | /* Now that user space can be considered to know the |
1291 | * identity address track the connection based on it | |
1292 | * from now on. | |
1293 | */ | |
1294 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1295 | hcon->dst_type = smp->remote_irk->addr_type; | |
1296 | l2cap_conn_update_id_addr(hcon); | |
66d8e837 MH |
1297 | |
1298 | /* When receiving an indentity resolving key for | |
1299 | * a remote device that does not use a resolvable | |
1300 | * private address, just remove the key so that | |
1301 | * it is possible to use the controller white | |
1302 | * list for scanning. | |
1303 | * | |
1304 | * Userspace will have been told to not store | |
1305 | * this key at this point. So it is safe to | |
1306 | * just remove it. | |
1307 | */ | |
1308 | if (!bacmp(&smp->remote_irk->rpa, BDADDR_ANY)) { | |
1309 | list_del(&smp->remote_irk->list); | |
1310 | kfree(smp->remote_irk); | |
1311 | smp->remote_irk = NULL; | |
1312 | } | |
61b1a7fb | 1313 | } |
95fbac8a | 1314 | |
53ac6ab6 MH |
1315 | /* The LTKs and CSRKs should be persistent only if both sides |
1316 | * had the bonding bit set in their authentication requests. | |
1317 | */ | |
1318 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
1319 | ||
7ee4ea36 MH |
1320 | if (smp->csrk) { |
1321 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1322 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1323 | mgmt_new_csrk(hdev, smp->csrk, persistent); |
7ee4ea36 MH |
1324 | } |
1325 | ||
1326 | if (smp->slave_csrk) { | |
1327 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1328 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1329 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); |
7ee4ea36 MH |
1330 | } |
1331 | ||
35d70271 JH |
1332 | if (smp->ltk) { |
1333 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1334 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1335 | mgmt_new_ltk(hdev, smp->ltk, persistent); |
35d70271 JH |
1336 | } |
1337 | ||
1338 | if (smp->slave_ltk) { | |
1339 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1340 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1341 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); |
35d70271 JH |
1342 | } |
1343 | } | |
1344 | ||
4bd6d38e | 1345 | int smp_distribute_keys(struct l2cap_conn *conn) |
7034b911 VCG |
1346 | { |
1347 | struct smp_cmd_pairing *req, *rsp; | |
1c1def09 | 1348 | struct smp_chan *smp = conn->smp_chan; |
524237cb JH |
1349 | struct hci_conn *hcon = conn->hcon; |
1350 | struct hci_dev *hdev = hcon->hdev; | |
7034b911 VCG |
1351 | __u8 *keydist; |
1352 | ||
4bd6d38e | 1353 | BT_DBG("conn %p", conn); |
7034b911 | 1354 | |
524237cb | 1355 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
1356 | return 0; |
1357 | ||
1c1def09 | 1358 | rsp = (void *) &smp->prsp[1]; |
7034b911 VCG |
1359 | |
1360 | /* The responder sends its keys first */ | |
efabba37 | 1361 | if (hcon->out && (smp->remote_key_dist & 0x07)) |
7034b911 VCG |
1362 | return 0; |
1363 | ||
1c1def09 | 1364 | req = (void *) &smp->preq[1]; |
7034b911 | 1365 | |
524237cb | 1366 | if (hcon->out) { |
7034b911 VCG |
1367 | keydist = &rsp->init_key_dist; |
1368 | *keydist &= req->init_key_dist; | |
1369 | } else { | |
1370 | keydist = &rsp->resp_key_dist; | |
1371 | *keydist &= req->resp_key_dist; | |
1372 | } | |
1373 | ||
7034b911 VCG |
1374 | BT_DBG("keydist 0x%x", *keydist); |
1375 | ||
1376 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1377 | struct smp_cmd_encrypt_info enc; | |
1378 | struct smp_cmd_master_ident ident; | |
23d0e128 | 1379 | struct smp_ltk *ltk; |
c9839a11 | 1380 | u8 authenticated; |
7034b911 | 1381 | __le16 ediv; |
fe39c7b2 | 1382 | __le64 rand; |
7034b911 VCG |
1383 | |
1384 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
1385 | get_random_bytes(&ediv, sizeof(ediv)); | |
fe39c7b2 | 1386 | get_random_bytes(&rand, sizeof(rand)); |
7034b911 VCG |
1387 | |
1388 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1389 | ||
c9839a11 | 1390 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; |
524237cb | 1391 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, |
2ceba539 | 1392 | SMP_LTK_SLAVE, authenticated, enc.ltk, |
fe39c7b2 | 1393 | smp->enc_key_size, ediv, rand); |
23d0e128 | 1394 | smp->slave_ltk = ltk; |
16b90839 | 1395 | |
58115373 | 1396 | ident.ediv = ediv; |
fe39c7b2 | 1397 | ident.rand = rand; |
7034b911 VCG |
1398 | |
1399 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1400 | ||
1401 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1402 | } | |
1403 | ||
1404 | if (*keydist & SMP_DIST_ID_KEY) { | |
1405 | struct smp_cmd_ident_addr_info addrinfo; | |
1406 | struct smp_cmd_ident_info idinfo; | |
1407 | ||
863efaf2 | 1408 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); |
7034b911 VCG |
1409 | |
1410 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1411 | ||
82d4b359 JH |
1412 | /* The hci_conn contains the local identity address |
1413 | * after the connection has been established. | |
1414 | * | |
1415 | * This is true even when the connection has been | |
1416 | * established using a resolvable random address. | |
1417 | */ | |
524237cb | 1418 | bacpy(&addrinfo.bdaddr, &hcon->src); |
82d4b359 | 1419 | addrinfo.addr_type = hcon->src_type; |
7034b911 VCG |
1420 | |
1421 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
f1560463 | 1422 | &addrinfo); |
7034b911 VCG |
1423 | |
1424 | *keydist &= ~SMP_DIST_ID_KEY; | |
1425 | } | |
1426 | ||
1427 | if (*keydist & SMP_DIST_SIGN) { | |
1428 | struct smp_cmd_sign_info sign; | |
7ee4ea36 | 1429 | struct smp_csrk *csrk; |
7034b911 | 1430 | |
7ee4ea36 | 1431 | /* Generate a new random key */ |
7034b911 VCG |
1432 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); |
1433 | ||
7ee4ea36 MH |
1434 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
1435 | if (csrk) { | |
1436 | csrk->master = 0x00; | |
1437 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
1438 | } | |
1439 | smp->slave_csrk = csrk; | |
1440 | ||
7034b911 VCG |
1441 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); |
1442 | ||
1443 | *keydist &= ~SMP_DIST_SIGN; | |
1444 | } | |
1445 | ||
efabba37 JH |
1446 | /* If there are still keys to be received wait for them */ |
1447 | if ((smp->remote_key_dist & 0x07)) | |
1448 | return 0; | |
1449 | ||
1d98bf4f JH |
1450 | clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags); |
1451 | cancel_delayed_work_sync(&conn->security_timer); | |
4a74d658 | 1452 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1d98bf4f | 1453 | smp_notify_keys(conn); |
efabba37 | 1454 | |
1d98bf4f | 1455 | smp_chan_destroy(conn); |
d26a2345 | 1456 | |
7034b911 VCG |
1457 | return 0; |
1458 | } |