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 | ||
4bc58f51 JH |
38 | #define SMP_FLAG_TK_VALID 1 |
39 | #define SMP_FLAG_CFM_PENDING 2 | |
40 | #define SMP_FLAG_MITM_AUTH 3 | |
41 | #define SMP_FLAG_COMPLETE 4 | |
42 | #define SMP_FLAG_INITIATOR 5 | |
43 | ||
44 | struct smp_chan { | |
45 | struct l2cap_conn *conn; | |
46 | u8 preq[7]; /* SMP Pairing Request */ | |
47 | u8 prsp[7]; /* SMP Pairing Response */ | |
48 | u8 prnd[16]; /* SMP Pairing Random (local) */ | |
49 | u8 rrnd[16]; /* SMP Pairing Random (remote) */ | |
50 | u8 pcnf[16]; /* SMP Pairing Confirm */ | |
51 | u8 tk[16]; /* SMP Temporary Key */ | |
52 | u8 enc_key_size; | |
53 | u8 remote_key_dist; | |
54 | bdaddr_t id_addr; | |
55 | u8 id_addr_type; | |
56 | u8 irk[16]; | |
57 | struct smp_csrk *csrk; | |
58 | struct smp_csrk *slave_csrk; | |
59 | struct smp_ltk *ltk; | |
60 | struct smp_ltk *slave_ltk; | |
61 | struct smp_irk *remote_irk; | |
4a74d658 | 62 | unsigned long flags; |
4bc58f51 JH |
63 | }; |
64 | ||
66bed1a2 | 65 | static inline void swap128(const u8 src[16], u8 dst[16]) |
d22ef0bc AB |
66 | { |
67 | int i; | |
68 | for (i = 0; i < 16; i++) | |
69 | dst[15 - i] = src[i]; | |
70 | } | |
71 | ||
66bed1a2 | 72 | static inline void swap56(const u8 src[7], u8 dst[7]) |
d22ef0bc AB |
73 | { |
74 | int i; | |
75 | for (i = 0; i < 7; i++) | |
76 | dst[6 - i] = src[i]; | |
77 | } | |
78 | ||
79 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) | |
80 | { | |
81 | struct blkcipher_desc desc; | |
82 | struct scatterlist sg; | |
943a732a | 83 | uint8_t tmp[16], data[16]; |
201a5929 | 84 | int err; |
d22ef0bc AB |
85 | |
86 | if (tfm == NULL) { | |
87 | BT_ERR("tfm %p", tfm); | |
88 | return -EINVAL; | |
89 | } | |
90 | ||
91 | desc.tfm = tfm; | |
92 | desc.flags = 0; | |
93 | ||
943a732a JH |
94 | /* The most significant octet of key corresponds to k[0] */ |
95 | swap128(k, tmp); | |
96 | ||
97 | err = crypto_blkcipher_setkey(tfm, tmp, 16); | |
d22ef0bc AB |
98 | if (err) { |
99 | BT_ERR("cipher setkey failed: %d", err); | |
100 | return err; | |
101 | } | |
102 | ||
943a732a JH |
103 | /* Most significant octet of plaintextData corresponds to data[0] */ |
104 | swap128(r, data); | |
105 | ||
106 | sg_init_one(&sg, data, 16); | |
d22ef0bc | 107 | |
d22ef0bc AB |
108 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
109 | if (err) | |
110 | BT_ERR("Encrypt data error %d", err); | |
111 | ||
943a732a JH |
112 | /* Most significant octet of encryptedData corresponds to data[0] */ |
113 | swap128(data, r); | |
114 | ||
d22ef0bc AB |
115 | return err; |
116 | } | |
117 | ||
60478054 JH |
118 | static int smp_ah(struct crypto_blkcipher *tfm, u8 irk[16], u8 r[3], u8 res[3]) |
119 | { | |
943a732a | 120 | u8 _res[16]; |
60478054 JH |
121 | int err; |
122 | ||
123 | /* r' = padding || r */ | |
943a732a JH |
124 | memcpy(_res, r, 3); |
125 | memset(_res + 3, 0, 13); | |
60478054 | 126 | |
943a732a | 127 | err = smp_e(tfm, irk, _res); |
60478054 JH |
128 | if (err) { |
129 | BT_ERR("Encrypt error"); | |
130 | return err; | |
131 | } | |
132 | ||
133 | /* The output of the random address function ah is: | |
134 | * ah(h, r) = e(k, r') mod 2^24 | |
135 | * The output of the security function e is then truncated to 24 bits | |
136 | * by taking the least significant 24 bits of the output of e as the | |
137 | * result of ah. | |
138 | */ | |
943a732a | 139 | memcpy(res, _res, 3); |
60478054 JH |
140 | |
141 | return 0; | |
142 | } | |
143 | ||
144 | bool smp_irk_matches(struct crypto_blkcipher *tfm, u8 irk[16], | |
145 | bdaddr_t *bdaddr) | |
146 | { | |
147 | u8 hash[3]; | |
148 | int err; | |
149 | ||
150 | BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk); | |
151 | ||
152 | err = smp_ah(tfm, irk, &bdaddr->b[3], hash); | |
153 | if (err) | |
154 | return false; | |
155 | ||
156 | return !memcmp(bdaddr->b, hash, 3); | |
157 | } | |
158 | ||
b1e2b3ae JH |
159 | int smp_generate_rpa(struct crypto_blkcipher *tfm, u8 irk[16], bdaddr_t *rpa) |
160 | { | |
161 | int err; | |
162 | ||
163 | get_random_bytes(&rpa->b[3], 3); | |
164 | ||
165 | rpa->b[5] &= 0x3f; /* Clear two most significant bits */ | |
166 | rpa->b[5] |= 0x40; /* Set second most significant bit */ | |
167 | ||
168 | err = smp_ah(tfm, irk, &rpa->b[3], rpa->b); | |
169 | if (err < 0) | |
170 | return err; | |
171 | ||
172 | BT_DBG("RPA %pMR", rpa); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
d22ef0bc | 177 | static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16], |
f1560463 MH |
178 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, |
179 | u8 _rat, bdaddr_t *ra, u8 res[16]) | |
d22ef0bc AB |
180 | { |
181 | u8 p1[16], p2[16]; | |
182 | int err; | |
183 | ||
184 | memset(p1, 0, 16); | |
185 | ||
186 | /* p1 = pres || preq || _rat || _iat */ | |
943a732a JH |
187 | p1[0] = _iat; |
188 | p1[1] = _rat; | |
189 | memcpy(p1 + 2, preq, 7); | |
190 | memcpy(p1 + 9, pres, 7); | |
d22ef0bc AB |
191 | |
192 | /* p2 = padding || ia || ra */ | |
943a732a JH |
193 | memcpy(p2, ra, 6); |
194 | memcpy(p2 + 6, ia, 6); | |
195 | memset(p2 + 12, 0, 4); | |
d22ef0bc AB |
196 | |
197 | /* res = r XOR p1 */ | |
198 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); | |
199 | ||
200 | /* res = e(k, res) */ | |
201 | err = smp_e(tfm, k, res); | |
202 | if (err) { | |
203 | BT_ERR("Encrypt data error"); | |
204 | return err; | |
205 | } | |
206 | ||
207 | /* res = res XOR p2 */ | |
208 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); | |
209 | ||
210 | /* res = e(k, res) */ | |
211 | err = smp_e(tfm, k, res); | |
212 | if (err) | |
213 | BT_ERR("Encrypt data error"); | |
214 | ||
215 | return err; | |
216 | } | |
217 | ||
f1560463 MH |
218 | static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16], u8 r1[16], |
219 | u8 r2[16], u8 _r[16]) | |
d22ef0bc AB |
220 | { |
221 | int err; | |
222 | ||
223 | /* Just least significant octets from r1 and r2 are considered */ | |
943a732a JH |
224 | memcpy(_r, r2, 8); |
225 | memcpy(_r + 8, r1, 8); | |
d22ef0bc AB |
226 | |
227 | err = smp_e(tfm, k, _r); | |
228 | if (err) | |
229 | BT_ERR("Encrypt data error"); | |
230 | ||
231 | return err; | |
232 | } | |
233 | ||
eb492e01 | 234 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, |
f1560463 | 235 | u16 dlen, void *data) |
eb492e01 AB |
236 | { |
237 | struct sk_buff *skb; | |
238 | struct l2cap_hdr *lh; | |
239 | int len; | |
240 | ||
241 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; | |
242 | ||
243 | if (len > conn->mtu) | |
244 | return NULL; | |
245 | ||
246 | skb = bt_skb_alloc(len, GFP_ATOMIC); | |
247 | if (!skb) | |
248 | return NULL; | |
249 | ||
250 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); | |
251 | lh->len = cpu_to_le16(sizeof(code) + dlen); | |
dcf4adbf | 252 | lh->cid = cpu_to_le16(L2CAP_CID_SMP); |
eb492e01 AB |
253 | |
254 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); | |
255 | ||
256 | memcpy(skb_put(skb, dlen), data, dlen); | |
257 | ||
258 | return skb; | |
259 | } | |
260 | ||
261 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) | |
262 | { | |
263 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); | |
264 | ||
265 | BT_DBG("code 0x%2.2x", code); | |
266 | ||
267 | if (!skb) | |
268 | return; | |
269 | ||
73d80deb LAD |
270 | skb->priority = HCI_PRIO_MAX; |
271 | hci_send_acl(conn->hchan, skb, 0); | |
e2dcd113 | 272 | |
6c9d42a1 | 273 | cancel_delayed_work_sync(&conn->security_timer); |
17b02e62 | 274 | schedule_delayed_work(&conn->security_timer, SMP_TIMEOUT); |
eb492e01 AB |
275 | } |
276 | ||
2b64d153 BG |
277 | static __u8 authreq_to_seclevel(__u8 authreq) |
278 | { | |
279 | if (authreq & SMP_AUTH_MITM) | |
280 | return BT_SECURITY_HIGH; | |
281 | else | |
282 | return BT_SECURITY_MEDIUM; | |
283 | } | |
284 | ||
285 | static __u8 seclevel_to_authreq(__u8 sec_level) | |
286 | { | |
287 | switch (sec_level) { | |
288 | case BT_SECURITY_HIGH: | |
289 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; | |
290 | case BT_SECURITY_MEDIUM: | |
291 | return SMP_AUTH_BONDING; | |
292 | default: | |
293 | return SMP_AUTH_NONE; | |
294 | } | |
295 | } | |
296 | ||
b8e66eac | 297 | static void build_pairing_cmd(struct l2cap_conn *conn, |
f1560463 MH |
298 | struct smp_cmd_pairing *req, |
299 | struct smp_cmd_pairing *rsp, __u8 authreq) | |
b8e66eac | 300 | { |
fd349c02 JH |
301 | struct smp_chan *smp = conn->smp_chan; |
302 | struct hci_conn *hcon = conn->hcon; | |
303 | struct hci_dev *hdev = hcon->hdev; | |
304 | u8 local_dist = 0, remote_dist = 0; | |
54790f73 | 305 | |
a8b2d5c2 | 306 | if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->dev_flags)) { |
7ee4ea36 MH |
307 | local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; |
308 | remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN; | |
54790f73 | 309 | authreq |= SMP_AUTH_BONDING; |
2b64d153 BG |
310 | } else { |
311 | authreq &= ~SMP_AUTH_BONDING; | |
54790f73 VCG |
312 | } |
313 | ||
fd349c02 JH |
314 | if (test_bit(HCI_RPA_RESOLVING, &hdev->dev_flags)) |
315 | remote_dist |= SMP_DIST_ID_KEY; | |
316 | ||
863efaf2 JH |
317 | if (test_bit(HCI_PRIVACY, &hdev->dev_flags)) |
318 | local_dist |= SMP_DIST_ID_KEY; | |
319 | ||
54790f73 VCG |
320 | if (rsp == NULL) { |
321 | req->io_capability = conn->hcon->io_capability; | |
322 | req->oob_flag = SMP_OOB_NOT_PRESENT; | |
323 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
324 | req->init_key_dist = local_dist; |
325 | req->resp_key_dist = remote_dist; | |
065a13e2 | 326 | req->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
327 | |
328 | smp->remote_key_dist = remote_dist; | |
54790f73 VCG |
329 | return; |
330 | } | |
331 | ||
332 | rsp->io_capability = conn->hcon->io_capability; | |
333 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; | |
334 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; | |
fd349c02 JH |
335 | rsp->init_key_dist = req->init_key_dist & remote_dist; |
336 | rsp->resp_key_dist = req->resp_key_dist & local_dist; | |
065a13e2 | 337 | rsp->auth_req = (authreq & AUTH_REQ_MASK); |
fd349c02 JH |
338 | |
339 | smp->remote_key_dist = rsp->init_key_dist; | |
b8e66eac VCG |
340 | } |
341 | ||
3158c50c VCG |
342 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
343 | { | |
1c1def09 VCG |
344 | struct smp_chan *smp = conn->smp_chan; |
345 | ||
3158c50c | 346 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
f1560463 | 347 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
3158c50c VCG |
348 | return SMP_ENC_KEY_SIZE; |
349 | ||
f7aa611a | 350 | smp->enc_key_size = max_key_size; |
3158c50c VCG |
351 | |
352 | return 0; | |
353 | } | |
354 | ||
84794e11 | 355 | static void smp_failure(struct l2cap_conn *conn, u8 reason) |
4f957a76 | 356 | { |
bab73cb6 JH |
357 | struct hci_conn *hcon = conn->hcon; |
358 | ||
84794e11 | 359 | if (reason) |
4f957a76 | 360 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
f1560463 | 361 | &reason); |
4f957a76 | 362 | |
ce39fb4e MH |
363 | clear_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags); |
364 | mgmt_auth_failed(hcon->hdev, &hcon->dst, hcon->type, hcon->dst_type, | |
365 | HCI_ERROR_AUTH_FAILURE); | |
f1c09c07 | 366 | |
61a0cfb0 AG |
367 | cancel_delayed_work_sync(&conn->security_timer); |
368 | ||
ce39fb4e | 369 | if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
f1c09c07 | 370 | smp_chan_destroy(conn); |
4f957a76 BG |
371 | } |
372 | ||
2b64d153 BG |
373 | #define JUST_WORKS 0x00 |
374 | #define JUST_CFM 0x01 | |
375 | #define REQ_PASSKEY 0x02 | |
376 | #define CFM_PASSKEY 0x03 | |
377 | #define REQ_OOB 0x04 | |
378 | #define OVERLAP 0xFF | |
379 | ||
380 | static const u8 gen_method[5][5] = { | |
381 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
382 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, | |
383 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, | |
384 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, | |
385 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, | |
386 | }; | |
387 | ||
388 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, | |
389 | u8 local_io, u8 remote_io) | |
390 | { | |
391 | struct hci_conn *hcon = conn->hcon; | |
392 | struct smp_chan *smp = conn->smp_chan; | |
393 | u8 method; | |
394 | u32 passkey = 0; | |
395 | int ret = 0; | |
396 | ||
397 | /* Initialize key for JUST WORKS */ | |
398 | memset(smp->tk, 0, sizeof(smp->tk)); | |
4a74d658 | 399 | clear_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
400 | |
401 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); | |
402 | ||
403 | /* If neither side wants MITM, use JUST WORKS */ | |
404 | /* If either side has unknown io_caps, use JUST WORKS */ | |
405 | /* Otherwise, look up method from the table */ | |
406 | if (!(auth & SMP_AUTH_MITM) || | |
f1560463 MH |
407 | local_io > SMP_IO_KEYBOARD_DISPLAY || |
408 | remote_io > SMP_IO_KEYBOARD_DISPLAY) | |
2b64d153 BG |
409 | method = JUST_WORKS; |
410 | else | |
b3ff53ff | 411 | method = gen_method[remote_io][local_io]; |
2b64d153 BG |
412 | |
413 | /* If not bonding, don't ask user to confirm a Zero TK */ | |
414 | if (!(auth & SMP_AUTH_BONDING) && method == JUST_CFM) | |
415 | method = JUST_WORKS; | |
416 | ||
a82505c7 | 417 | /* Don't confirm locally initiated pairing attempts */ |
4a74d658 | 418 | if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags)) |
a82505c7 JH |
419 | method = JUST_WORKS; |
420 | ||
2b64d153 BG |
421 | /* If Just Works, Continue with Zero TK */ |
422 | if (method == JUST_WORKS) { | |
4a74d658 | 423 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
424 | return 0; |
425 | } | |
426 | ||
427 | /* Not Just Works/Confirm results in MITM Authentication */ | |
428 | if (method != JUST_CFM) | |
4a74d658 | 429 | set_bit(SMP_FLAG_MITM_AUTH, &smp->flags); |
2b64d153 BG |
430 | |
431 | /* If both devices have Keyoard-Display I/O, the master | |
432 | * Confirms and the slave Enters the passkey. | |
433 | */ | |
434 | if (method == OVERLAP) { | |
435 | if (hcon->link_mode & HCI_LM_MASTER) | |
436 | method = CFM_PASSKEY; | |
437 | else | |
438 | method = REQ_PASSKEY; | |
439 | } | |
440 | ||
01ad34d2 | 441 | /* Generate random passkey. */ |
2b64d153 | 442 | if (method == CFM_PASSKEY) { |
943a732a | 443 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 BG |
444 | get_random_bytes(&passkey, sizeof(passkey)); |
445 | passkey %= 1000000; | |
943a732a | 446 | put_unaligned_le32(passkey, smp->tk); |
2b64d153 | 447 | BT_DBG("PassKey: %d", passkey); |
4a74d658 | 448 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
449 | } |
450 | ||
451 | hci_dev_lock(hcon->hdev); | |
452 | ||
453 | if (method == REQ_PASSKEY) | |
ce39fb4e | 454 | ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst, |
272d90df | 455 | hcon->type, hcon->dst_type); |
4eb65e66 JH |
456 | else if (method == JUST_CFM) |
457 | ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, | |
458 | hcon->type, hcon->dst_type, | |
459 | passkey, 1); | |
2b64d153 | 460 | else |
01ad34d2 | 461 | ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst, |
272d90df | 462 | hcon->type, hcon->dst_type, |
39adbffe | 463 | passkey, 0); |
2b64d153 BG |
464 | |
465 | hci_dev_unlock(hcon->hdev); | |
466 | ||
467 | return ret; | |
468 | } | |
469 | ||
1cc61144 | 470 | static u8 smp_confirm(struct smp_chan *smp) |
8aab4757 | 471 | { |
8aab4757 | 472 | struct l2cap_conn *conn = smp->conn; |
893ce8b1 JH |
473 | struct hci_dev *hdev = conn->hcon->hdev; |
474 | struct crypto_blkcipher *tfm = hdev->tfm_aes; | |
8aab4757 VCG |
475 | struct smp_cmd_pairing_confirm cp; |
476 | int ret; | |
8aab4757 VCG |
477 | |
478 | BT_DBG("conn %p", conn); | |
479 | ||
893ce8b1 JH |
480 | /* Prevent mutual access to hdev->tfm_aes */ |
481 | hci_dev_lock(hdev); | |
8aab4757 | 482 | |
b1cd5fd9 JH |
483 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, |
484 | conn->hcon->init_addr_type, &conn->hcon->init_addr, | |
943a732a JH |
485 | conn->hcon->resp_addr_type, &conn->hcon->resp_addr, |
486 | cp.confirm_val); | |
893ce8b1 JH |
487 | |
488 | hci_dev_unlock(hdev); | |
489 | ||
1cc61144 JH |
490 | if (ret) |
491 | return SMP_UNSPECIFIED; | |
8aab4757 | 492 | |
4a74d658 | 493 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 | 494 | |
8aab4757 VCG |
495 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
496 | ||
1cc61144 | 497 | return 0; |
8aab4757 VCG |
498 | } |
499 | ||
861580a9 | 500 | static u8 smp_random(struct smp_chan *smp) |
8aab4757 | 501 | { |
8aab4757 VCG |
502 | struct l2cap_conn *conn = smp->conn; |
503 | struct hci_conn *hcon = conn->hcon; | |
893ce8b1 JH |
504 | struct hci_dev *hdev = hcon->hdev; |
505 | struct crypto_blkcipher *tfm = hdev->tfm_aes; | |
861580a9 | 506 | u8 confirm[16]; |
8aab4757 VCG |
507 | int ret; |
508 | ||
861580a9 JH |
509 | if (IS_ERR_OR_NULL(tfm)) |
510 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
511 | |
512 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); | |
513 | ||
893ce8b1 JH |
514 | /* Prevent mutual access to hdev->tfm_aes */ |
515 | hci_dev_lock(hdev); | |
516 | ||
b1cd5fd9 JH |
517 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
518 | hcon->init_addr_type, &hcon->init_addr, | |
943a732a | 519 | hcon->resp_addr_type, &hcon->resp_addr, confirm); |
893ce8b1 JH |
520 | |
521 | hci_dev_unlock(hdev); | |
522 | ||
861580a9 JH |
523 | if (ret) |
524 | return SMP_UNSPECIFIED; | |
8aab4757 | 525 | |
8aab4757 VCG |
526 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
527 | BT_ERR("Pairing failed (confirmation values mismatch)"); | |
861580a9 | 528 | return SMP_CONFIRM_FAILED; |
8aab4757 VCG |
529 | } |
530 | ||
531 | if (hcon->out) { | |
fe39c7b2 MH |
532 | u8 stk[16]; |
533 | __le64 rand = 0; | |
534 | __le16 ediv = 0; | |
8aab4757 | 535 | |
943a732a | 536 | smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, stk); |
8aab4757 | 537 | |
f7aa611a | 538 | memset(stk + smp->enc_key_size, 0, |
04124681 | 539 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 540 | |
861580a9 JH |
541 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
542 | return SMP_UNSPECIFIED; | |
8aab4757 VCG |
543 | |
544 | hci_le_start_enc(hcon, ediv, rand, stk); | |
f7aa611a | 545 | hcon->enc_key_size = smp->enc_key_size; |
8aab4757 | 546 | } else { |
943a732a | 547 | u8 stk[16]; |
fe39c7b2 MH |
548 | __le64 rand = 0; |
549 | __le16 ediv = 0; | |
8aab4757 | 550 | |
943a732a JH |
551 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), |
552 | smp->prnd); | |
8aab4757 | 553 | |
943a732a | 554 | smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, stk); |
8aab4757 | 555 | |
f7aa611a | 556 | memset(stk + smp->enc_key_size, 0, |
f1560463 | 557 | SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); |
8aab4757 | 558 | |
ce39fb4e | 559 | hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, |
35d70271 | 560 | HCI_SMP_STK_SLAVE, 0, stk, smp->enc_key_size, |
04124681 | 561 | ediv, rand); |
8aab4757 VCG |
562 | } |
563 | ||
861580a9 | 564 | return 0; |
8aab4757 VCG |
565 | } |
566 | ||
567 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) | |
568 | { | |
569 | struct smp_chan *smp; | |
570 | ||
f1560463 | 571 | smp = kzalloc(sizeof(*smp), GFP_ATOMIC); |
8aab4757 VCG |
572 | if (!smp) |
573 | return NULL; | |
574 | ||
8aab4757 VCG |
575 | smp->conn = conn; |
576 | conn->smp_chan = smp; | |
2b64d153 | 577 | conn->hcon->smp_conn = conn; |
8aab4757 VCG |
578 | |
579 | hci_conn_hold(conn->hcon); | |
580 | ||
581 | return smp; | |
582 | } | |
583 | ||
584 | void smp_chan_destroy(struct l2cap_conn *conn) | |
585 | { | |
c8eb9690 | 586 | struct smp_chan *smp = conn->smp_chan; |
f4a407be | 587 | bool complete; |
c8eb9690 | 588 | |
f1c09c07 | 589 | BUG_ON(!smp); |
c8eb9690 | 590 | |
4a74d658 | 591 | complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags); |
f4a407be JH |
592 | mgmt_smp_complete(conn->hcon, complete); |
593 | ||
7ee4ea36 MH |
594 | kfree(smp->csrk); |
595 | kfree(smp->slave_csrk); | |
596 | ||
759331d7 JH |
597 | /* If pairing failed clean up any keys we might have */ |
598 | if (!complete) { | |
599 | if (smp->ltk) { | |
600 | list_del(&smp->ltk->list); | |
601 | kfree(smp->ltk); | |
602 | } | |
603 | ||
604 | if (smp->slave_ltk) { | |
605 | list_del(&smp->slave_ltk->list); | |
606 | kfree(smp->slave_ltk); | |
607 | } | |
608 | ||
609 | if (smp->remote_irk) { | |
610 | list_del(&smp->remote_irk->list); | |
611 | kfree(smp->remote_irk); | |
612 | } | |
613 | } | |
614 | ||
c8eb9690 BG |
615 | kfree(smp); |
616 | conn->smp_chan = NULL; | |
2b64d153 | 617 | conn->hcon->smp_conn = NULL; |
76a68ba0 | 618 | hci_conn_drop(conn->hcon); |
8aab4757 VCG |
619 | } |
620 | ||
2b64d153 BG |
621 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
622 | { | |
623 | struct l2cap_conn *conn = hcon->smp_conn; | |
624 | struct smp_chan *smp; | |
625 | u32 value; | |
2b64d153 BG |
626 | |
627 | BT_DBG(""); | |
628 | ||
629 | if (!conn) | |
630 | return -ENOTCONN; | |
631 | ||
632 | smp = conn->smp_chan; | |
633 | ||
634 | switch (mgmt_op) { | |
635 | case MGMT_OP_USER_PASSKEY_REPLY: | |
636 | value = le32_to_cpu(passkey); | |
943a732a | 637 | memset(smp->tk, 0, sizeof(smp->tk)); |
2b64d153 | 638 | BT_DBG("PassKey: %d", value); |
943a732a | 639 | put_unaligned_le32(value, smp->tk); |
2b64d153 BG |
640 | /* Fall Through */ |
641 | case MGMT_OP_USER_CONFIRM_REPLY: | |
4a74d658 | 642 | set_bit(SMP_FLAG_TK_VALID, &smp->flags); |
2b64d153 BG |
643 | break; |
644 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: | |
645 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: | |
84794e11 | 646 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
647 | return 0; |
648 | default: | |
84794e11 | 649 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED); |
2b64d153 BG |
650 | return -EOPNOTSUPP; |
651 | } | |
652 | ||
653 | /* If it is our turn to send Pairing Confirm, do so now */ | |
1cc61144 JH |
654 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) { |
655 | u8 rsp = smp_confirm(smp); | |
656 | if (rsp) | |
657 | smp_failure(conn, rsp); | |
658 | } | |
2b64d153 BG |
659 | |
660 | return 0; | |
661 | } | |
662 | ||
da85e5e5 | 663 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 664 | { |
3158c50c | 665 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
8aab4757 | 666 | struct smp_chan *smp; |
1ef35827 | 667 | u8 key_size, auth; |
8aab4757 | 668 | int ret; |
88ba43b6 AB |
669 | |
670 | BT_DBG("conn %p", conn); | |
671 | ||
c46b98be | 672 | if (skb->len < sizeof(*req)) |
38e4a915 | 673 | return SMP_INVALID_PARAMS; |
c46b98be | 674 | |
2b64d153 BG |
675 | if (conn->hcon->link_mode & HCI_LM_MASTER) |
676 | return SMP_CMD_NOTSUPP; | |
677 | ||
51a8efd7 | 678 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) |
8aab4757 | 679 | smp = smp_chan_create(conn); |
d08fd0e7 AE |
680 | else |
681 | smp = conn->smp_chan; | |
8aab4757 | 682 | |
d08fd0e7 AE |
683 | if (!smp) |
684 | return SMP_UNSPECIFIED; | |
d26a2345 | 685 | |
1c1def09 VCG |
686 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
687 | memcpy(&smp->preq[1], req, sizeof(*req)); | |
3158c50c | 688 | skb_pull(skb, sizeof(*req)); |
88ba43b6 | 689 | |
2b64d153 | 690 | /* We didn't start the pairing, so match remote */ |
1ef35827 | 691 | auth = req->auth_req; |
da85e5e5 | 692 | |
fdde0a26 IY |
693 | conn->hcon->pending_sec_level = authreq_to_seclevel(auth); |
694 | ||
2b64d153 | 695 | build_pairing_cmd(conn, req, &rsp, auth); |
3158c50c VCG |
696 | |
697 | key_size = min(req->max_key_size, rsp.max_key_size); | |
698 | if (check_enc_key_size(conn, key_size)) | |
699 | return SMP_ENC_KEY_SIZE; | |
88ba43b6 | 700 | |
e84a6b13 | 701 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
8aab4757 | 702 | |
1c1def09 VCG |
703 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
704 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); | |
f01ead31 | 705 | |
3158c50c | 706 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
da85e5e5 | 707 | |
2b64d153 BG |
708 | /* Request setup of TK */ |
709 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); | |
710 | if (ret) | |
711 | return SMP_UNSPECIFIED; | |
712 | ||
4a74d658 | 713 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); |
edca792c | 714 | |
da85e5e5 | 715 | return 0; |
88ba43b6 AB |
716 | } |
717 | ||
da85e5e5 | 718 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 719 | { |
3158c50c | 720 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
1c1def09 | 721 | struct smp_chan *smp = conn->smp_chan; |
2b64d153 | 722 | u8 key_size, auth = SMP_AUTH_NONE; |
7d24ddcc | 723 | int ret; |
88ba43b6 AB |
724 | |
725 | BT_DBG("conn %p", conn); | |
726 | ||
c46b98be | 727 | if (skb->len < sizeof(*rsp)) |
38e4a915 | 728 | return SMP_INVALID_PARAMS; |
c46b98be | 729 | |
2b64d153 BG |
730 | if (!(conn->hcon->link_mode & HCI_LM_MASTER)) |
731 | return SMP_CMD_NOTSUPP; | |
732 | ||
3158c50c VCG |
733 | skb_pull(skb, sizeof(*rsp)); |
734 | ||
1c1def09 | 735 | req = (void *) &smp->preq[1]; |
da85e5e5 | 736 | |
3158c50c VCG |
737 | key_size = min(req->max_key_size, rsp->max_key_size); |
738 | if (check_enc_key_size(conn, key_size)) | |
739 | return SMP_ENC_KEY_SIZE; | |
740 | ||
e84a6b13 | 741 | get_random_bytes(smp->prnd, sizeof(smp->prnd)); |
7d24ddcc | 742 | |
8aab4757 VCG |
743 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
744 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); | |
7d24ddcc | 745 | |
fdcc4bec JH |
746 | /* Update remote key distribution in case the remote cleared |
747 | * some bits that we had enabled in our request. | |
748 | */ | |
749 | smp->remote_key_dist &= rsp->resp_key_dist; | |
750 | ||
2b64d153 | 751 | if ((req->auth_req & SMP_AUTH_BONDING) && |
f1560463 | 752 | (rsp->auth_req & SMP_AUTH_BONDING)) |
2b64d153 BG |
753 | auth = SMP_AUTH_BONDING; |
754 | ||
755 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; | |
756 | ||
476585ec | 757 | ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability); |
2b64d153 BG |
758 | if (ret) |
759 | return SMP_UNSPECIFIED; | |
760 | ||
4a74d658 | 761 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
2b64d153 BG |
762 | |
763 | /* Can't compose response until we have been confirmed */ | |
4a74d658 | 764 | if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 765 | return smp_confirm(smp); |
da85e5e5 VCG |
766 | |
767 | return 0; | |
88ba43b6 AB |
768 | } |
769 | ||
da85e5e5 | 770 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 771 | { |
1c1def09 | 772 | struct smp_chan *smp = conn->smp_chan; |
7d24ddcc | 773 | |
88ba43b6 AB |
774 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
775 | ||
c46b98be | 776 | if (skb->len < sizeof(smp->pcnf)) |
38e4a915 | 777 | return SMP_INVALID_PARAMS; |
c46b98be | 778 | |
1c1def09 VCG |
779 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
780 | skb_pull(skb, sizeof(smp->pcnf)); | |
88ba43b6 | 781 | |
943a732a JH |
782 | if (conn->hcon->out) |
783 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd), | |
784 | smp->prnd); | |
4a74d658 | 785 | else if (test_bit(SMP_FLAG_TK_VALID, &smp->flags)) |
1cc61144 | 786 | return smp_confirm(smp); |
943a732a | 787 | else |
4a74d658 | 788 | set_bit(SMP_FLAG_CFM_PENDING, &smp->flags); |
da85e5e5 VCG |
789 | |
790 | return 0; | |
88ba43b6 AB |
791 | } |
792 | ||
da85e5e5 | 793 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 | 794 | { |
1c1def09 | 795 | struct smp_chan *smp = conn->smp_chan; |
7d24ddcc | 796 | |
8aab4757 | 797 | BT_DBG("conn %p", conn); |
3158c50c | 798 | |
c46b98be | 799 | if (skb->len < sizeof(smp->rrnd)) |
38e4a915 | 800 | return SMP_INVALID_PARAMS; |
c46b98be | 801 | |
943a732a | 802 | memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd)); |
8aab4757 | 803 | skb_pull(skb, sizeof(smp->rrnd)); |
e7e62c85 | 804 | |
861580a9 | 805 | return smp_random(smp); |
88ba43b6 AB |
806 | } |
807 | ||
4dab7864 | 808 | static u8 smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level) |
988c5997 | 809 | { |
c9839a11 | 810 | struct smp_ltk *key; |
988c5997 VCG |
811 | struct hci_conn *hcon = conn->hcon; |
812 | ||
98a0b845 JH |
813 | key = hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type, |
814 | hcon->out); | |
988c5997 VCG |
815 | if (!key) |
816 | return 0; | |
817 | ||
4dab7864 JH |
818 | if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated) |
819 | return 0; | |
820 | ||
51a8efd7 | 821 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) |
988c5997 VCG |
822 | return 1; |
823 | ||
c9839a11 VCG |
824 | hci_le_start_enc(hcon, key->ediv, key->rand, key->val); |
825 | hcon->enc_key_size = key->enc_size; | |
988c5997 VCG |
826 | |
827 | return 1; | |
988c5997 | 828 | } |
f1560463 | 829 | |
da85e5e5 | 830 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
88ba43b6 AB |
831 | { |
832 | struct smp_cmd_security_req *rp = (void *) skb->data; | |
833 | struct smp_cmd_pairing cp; | |
f1cb9af5 | 834 | struct hci_conn *hcon = conn->hcon; |
8aab4757 | 835 | struct smp_chan *smp; |
88ba43b6 AB |
836 | |
837 | BT_DBG("conn %p", conn); | |
838 | ||
c46b98be | 839 | if (skb->len < sizeof(*rp)) |
38e4a915 | 840 | return SMP_INVALID_PARAMS; |
c46b98be | 841 | |
86ca9eac JH |
842 | if (!(conn->hcon->link_mode & HCI_LM_MASTER)) |
843 | return SMP_CMD_NOTSUPP; | |
844 | ||
2b64d153 | 845 | hcon->pending_sec_level = authreq_to_seclevel(rp->auth_req); |
feb45eb5 | 846 | |
4dab7864 | 847 | if (smp_ltk_encrypt(conn, hcon->pending_sec_level)) |
988c5997 VCG |
848 | return 0; |
849 | ||
51a8efd7 | 850 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
da85e5e5 | 851 | return 0; |
f1cb9af5 | 852 | |
8aab4757 | 853 | smp = smp_chan_create(conn); |
d26a2345 | 854 | |
88ba43b6 | 855 | skb_pull(skb, sizeof(*rp)); |
88ba43b6 | 856 | |
da85e5e5 | 857 | memset(&cp, 0, sizeof(cp)); |
54790f73 | 858 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
88ba43b6 | 859 | |
1c1def09 VCG |
860 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
861 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 862 | |
88ba43b6 | 863 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
f1cb9af5 | 864 | |
4a74d658 | 865 | clear_bit(SMP_FLAG_INITIATOR, &smp->flags); |
edca792c | 866 | |
da85e5e5 | 867 | return 0; |
88ba43b6 AB |
868 | } |
869 | ||
ad32a2f5 JH |
870 | bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level) |
871 | { | |
872 | if (sec_level == BT_SECURITY_LOW) | |
873 | return true; | |
874 | ||
875 | if (hcon->sec_level >= sec_level) | |
876 | return true; | |
877 | ||
878 | return false; | |
879 | } | |
880 | ||
cc110922 | 881 | int smp_conn_security(struct hci_conn *hcon, __u8 sec_level) |
eb492e01 | 882 | { |
cc110922 | 883 | struct l2cap_conn *conn = hcon->l2cap_data; |
0a66cf20 | 884 | struct smp_chan *smp; |
2b64d153 | 885 | __u8 authreq; |
eb492e01 | 886 | |
3a0259bb VCG |
887 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
888 | ||
0a66cf20 JH |
889 | /* This may be NULL if there's an unexpected disconnection */ |
890 | if (!conn) | |
891 | return 1; | |
892 | ||
757aee0f | 893 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) |
2e65c9d2 AG |
894 | return 1; |
895 | ||
ad32a2f5 | 896 | if (smp_sufficient_security(hcon, sec_level)) |
eb492e01 | 897 | return 1; |
f1cb9af5 | 898 | |
988c5997 | 899 | if (hcon->link_mode & HCI_LM_MASTER) |
4dab7864 | 900 | if (smp_ltk_encrypt(conn, sec_level)) |
02bc7455 | 901 | goto done; |
d26a2345 | 902 | |
51a8efd7 | 903 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
904 | return 0; |
905 | ||
8aab4757 | 906 | smp = smp_chan_create(conn); |
2b64d153 BG |
907 | if (!smp) |
908 | return 1; | |
909 | ||
910 | authreq = seclevel_to_authreq(sec_level); | |
d26a2345 | 911 | |
79897d20 JH |
912 | /* Require MITM if IO Capability allows or the security level |
913 | * requires it. | |
2e233644 | 914 | */ |
79897d20 JH |
915 | if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT || |
916 | sec_level > BT_SECURITY_MEDIUM) | |
2e233644 JH |
917 | authreq |= SMP_AUTH_MITM; |
918 | ||
d26a2345 VCG |
919 | if (hcon->link_mode & HCI_LM_MASTER) { |
920 | struct smp_cmd_pairing cp; | |
f01ead31 | 921 | |
2b64d153 | 922 | build_pairing_cmd(conn, &cp, NULL, authreq); |
1c1def09 VCG |
923 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
924 | memcpy(&smp->preq[1], &cp, sizeof(cp)); | |
f01ead31 | 925 | |
eb492e01 AB |
926 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
927 | } else { | |
928 | struct smp_cmd_security_req cp; | |
2b64d153 | 929 | cp.auth_req = authreq; |
eb492e01 AB |
930 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
931 | } | |
932 | ||
4a74d658 | 933 | set_bit(SMP_FLAG_INITIATOR, &smp->flags); |
edca792c | 934 | |
61b3b2b6 | 935 | done: |
f1cb9af5 | 936 | hcon->pending_sec_level = sec_level; |
f1cb9af5 | 937 | |
eb492e01 AB |
938 | return 0; |
939 | } | |
940 | ||
7034b911 VCG |
941 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
942 | { | |
16b90839 | 943 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
1c1def09 | 944 | struct smp_chan *smp = conn->smp_chan; |
16b90839 | 945 | |
c46b98be JH |
946 | BT_DBG("conn %p", conn); |
947 | ||
948 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 949 | return SMP_INVALID_PARAMS; |
c46b98be | 950 | |
6131ddc8 JH |
951 | /* Ignore this PDU if it wasn't requested */ |
952 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
953 | return 0; | |
954 | ||
16b90839 VCG |
955 | skb_pull(skb, sizeof(*rp)); |
956 | ||
1c1def09 | 957 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
16b90839 | 958 | |
7034b911 VCG |
959 | return 0; |
960 | } | |
961 | ||
962 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) | |
963 | { | |
16b90839 | 964 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
1c1def09 | 965 | struct smp_chan *smp = conn->smp_chan; |
c9839a11 VCG |
966 | struct hci_dev *hdev = conn->hcon->hdev; |
967 | struct hci_conn *hcon = conn->hcon; | |
23d0e128 | 968 | struct smp_ltk *ltk; |
c9839a11 | 969 | u8 authenticated; |
16b90839 | 970 | |
c46b98be JH |
971 | BT_DBG("conn %p", conn); |
972 | ||
973 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 974 | return SMP_INVALID_PARAMS; |
c46b98be | 975 | |
6131ddc8 JH |
976 | /* Ignore this PDU if it wasn't requested */ |
977 | if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY)) | |
978 | return 0; | |
979 | ||
9747a9f3 JH |
980 | /* Mark the information as received */ |
981 | smp->remote_key_dist &= ~SMP_DIST_ENC_KEY; | |
982 | ||
16b90839 | 983 | skb_pull(skb, sizeof(*rp)); |
7034b911 | 984 | |
c9839a11 | 985 | hci_dev_lock(hdev); |
ce39fb4e | 986 | authenticated = (hcon->sec_level == BT_SECURITY_HIGH); |
35d70271 | 987 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, HCI_SMP_LTK, |
23d0e128 JH |
988 | authenticated, smp->tk, smp->enc_key_size, |
989 | rp->ediv, rp->rand); | |
990 | smp->ltk = ltk; | |
fd349c02 | 991 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) |
4bd6d38e | 992 | smp_distribute_keys(conn); |
c9839a11 | 993 | hci_dev_unlock(hdev); |
7034b911 VCG |
994 | |
995 | return 0; | |
996 | } | |
997 | ||
fd349c02 JH |
998 | static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb) |
999 | { | |
1000 | struct smp_cmd_ident_info *info = (void *) skb->data; | |
1001 | struct smp_chan *smp = conn->smp_chan; | |
1002 | ||
1003 | BT_DBG(""); | |
1004 | ||
1005 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1006 | return SMP_INVALID_PARAMS; |
fd349c02 | 1007 | |
6131ddc8 JH |
1008 | /* Ignore this PDU if it wasn't requested */ |
1009 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1010 | return 0; | |
1011 | ||
fd349c02 JH |
1012 | skb_pull(skb, sizeof(*info)); |
1013 | ||
1014 | memcpy(smp->irk, info->irk, 16); | |
1015 | ||
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | static int smp_cmd_ident_addr_info(struct l2cap_conn *conn, | |
1020 | struct sk_buff *skb) | |
1021 | { | |
1022 | struct smp_cmd_ident_addr_info *info = (void *) skb->data; | |
1023 | struct smp_chan *smp = conn->smp_chan; | |
1024 | struct hci_conn *hcon = conn->hcon; | |
1025 | bdaddr_t rpa; | |
1026 | ||
1027 | BT_DBG(""); | |
1028 | ||
1029 | if (skb->len < sizeof(*info)) | |
38e4a915 | 1030 | return SMP_INVALID_PARAMS; |
fd349c02 | 1031 | |
6131ddc8 JH |
1032 | /* Ignore this PDU if it wasn't requested */ |
1033 | if (!(smp->remote_key_dist & SMP_DIST_ID_KEY)) | |
1034 | return 0; | |
1035 | ||
9747a9f3 JH |
1036 | /* Mark the information as received */ |
1037 | smp->remote_key_dist &= ~SMP_DIST_ID_KEY; | |
1038 | ||
fd349c02 JH |
1039 | skb_pull(skb, sizeof(*info)); |
1040 | ||
a9a58f86 JH |
1041 | /* Strictly speaking the Core Specification (4.1) allows sending |
1042 | * an empty address which would force us to rely on just the IRK | |
1043 | * as "identity information". However, since such | |
1044 | * implementations are not known of and in order to not over | |
1045 | * complicate our implementation, simply pretend that we never | |
1046 | * received an IRK for such a device. | |
1047 | */ | |
1048 | if (!bacmp(&info->bdaddr, BDADDR_ANY)) { | |
1049 | BT_ERR("Ignoring IRK with no identity address"); | |
4bd6d38e | 1050 | smp_distribute_keys(conn); |
a9a58f86 JH |
1051 | return 0; |
1052 | } | |
1053 | ||
fd349c02 JH |
1054 | bacpy(&smp->id_addr, &info->bdaddr); |
1055 | smp->id_addr_type = info->addr_type; | |
1056 | ||
1057 | if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type)) | |
1058 | bacpy(&rpa, &hcon->dst); | |
1059 | else | |
1060 | bacpy(&rpa, BDADDR_ANY); | |
1061 | ||
23d0e128 JH |
1062 | smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr, |
1063 | smp->id_addr_type, smp->irk, &rpa); | |
fd349c02 | 1064 | |
4bd6d38e | 1065 | smp_distribute_keys(conn); |
fd349c02 JH |
1066 | |
1067 | return 0; | |
1068 | } | |
1069 | ||
7ee4ea36 MH |
1070 | static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb) |
1071 | { | |
1072 | struct smp_cmd_sign_info *rp = (void *) skb->data; | |
1073 | struct smp_chan *smp = conn->smp_chan; | |
1074 | struct hci_dev *hdev = conn->hcon->hdev; | |
1075 | struct smp_csrk *csrk; | |
1076 | ||
1077 | BT_DBG("conn %p", conn); | |
1078 | ||
1079 | if (skb->len < sizeof(*rp)) | |
38e4a915 | 1080 | return SMP_INVALID_PARAMS; |
7ee4ea36 MH |
1081 | |
1082 | /* Ignore this PDU if it wasn't requested */ | |
1083 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1084 | return 0; | |
1085 | ||
1086 | /* Mark the information as received */ | |
1087 | smp->remote_key_dist &= ~SMP_DIST_SIGN; | |
1088 | ||
1089 | skb_pull(skb, sizeof(*rp)); | |
1090 | ||
1091 | hci_dev_lock(hdev); | |
1092 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); | |
1093 | if (csrk) { | |
1094 | csrk->master = 0x01; | |
1095 | memcpy(csrk->val, rp->csrk, sizeof(csrk->val)); | |
1096 | } | |
1097 | smp->csrk = csrk; | |
1098 | if (!(smp->remote_key_dist & SMP_DIST_SIGN)) | |
1099 | smp_distribute_keys(conn); | |
1100 | hci_dev_unlock(hdev); | |
1101 | ||
1102 | return 0; | |
1103 | } | |
1104 | ||
eb492e01 AB |
1105 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
1106 | { | |
7b9899db | 1107 | struct hci_conn *hcon = conn->hcon; |
92381f5c | 1108 | __u8 code, reason; |
eb492e01 AB |
1109 | int err = 0; |
1110 | ||
7b9899db MH |
1111 | if (hcon->type != LE_LINK) { |
1112 | kfree_skb(skb); | |
3432711f | 1113 | return 0; |
7b9899db MH |
1114 | } |
1115 | ||
92381f5c MH |
1116 | if (skb->len < 1) { |
1117 | kfree_skb(skb); | |
1118 | return -EILSEQ; | |
1119 | } | |
1120 | ||
06ae3314 | 1121 | if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { |
2e65c9d2 AG |
1122 | err = -ENOTSUPP; |
1123 | reason = SMP_PAIRING_NOTSUPP; | |
1124 | goto done; | |
1125 | } | |
1126 | ||
92381f5c | 1127 | code = skb->data[0]; |
eb492e01 AB |
1128 | skb_pull(skb, sizeof(code)); |
1129 | ||
8cf9fa12 JH |
1130 | /* |
1131 | * The SMP context must be initialized for all other PDUs except | |
1132 | * pairing and security requests. If we get any other PDU when | |
1133 | * not initialized simply disconnect (done if this function | |
1134 | * returns an error). | |
1135 | */ | |
1136 | if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && | |
1137 | !conn->smp_chan) { | |
1138 | BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); | |
1139 | kfree_skb(skb); | |
1140 | return -ENOTSUPP; | |
1141 | } | |
1142 | ||
eb492e01 AB |
1143 | switch (code) { |
1144 | case SMP_CMD_PAIRING_REQ: | |
da85e5e5 | 1145 | reason = smp_cmd_pairing_req(conn, skb); |
eb492e01 AB |
1146 | break; |
1147 | ||
1148 | case SMP_CMD_PAIRING_FAIL: | |
84794e11 | 1149 | smp_failure(conn, 0); |
da85e5e5 VCG |
1150 | reason = 0; |
1151 | err = -EPERM; | |
eb492e01 AB |
1152 | break; |
1153 | ||
1154 | case SMP_CMD_PAIRING_RSP: | |
da85e5e5 | 1155 | reason = smp_cmd_pairing_rsp(conn, skb); |
88ba43b6 AB |
1156 | break; |
1157 | ||
1158 | case SMP_CMD_SECURITY_REQ: | |
da85e5e5 | 1159 | reason = smp_cmd_security_req(conn, skb); |
88ba43b6 AB |
1160 | break; |
1161 | ||
eb492e01 | 1162 | case SMP_CMD_PAIRING_CONFIRM: |
da85e5e5 | 1163 | reason = smp_cmd_pairing_confirm(conn, skb); |
88ba43b6 AB |
1164 | break; |
1165 | ||
eb492e01 | 1166 | case SMP_CMD_PAIRING_RANDOM: |
da85e5e5 | 1167 | reason = smp_cmd_pairing_random(conn, skb); |
88ba43b6 AB |
1168 | break; |
1169 | ||
eb492e01 | 1170 | case SMP_CMD_ENCRYPT_INFO: |
7034b911 VCG |
1171 | reason = smp_cmd_encrypt_info(conn, skb); |
1172 | break; | |
1173 | ||
eb492e01 | 1174 | case SMP_CMD_MASTER_IDENT: |
7034b911 VCG |
1175 | reason = smp_cmd_master_ident(conn, skb); |
1176 | break; | |
1177 | ||
eb492e01 | 1178 | case SMP_CMD_IDENT_INFO: |
fd349c02 JH |
1179 | reason = smp_cmd_ident_info(conn, skb); |
1180 | break; | |
1181 | ||
eb492e01 | 1182 | case SMP_CMD_IDENT_ADDR_INFO: |
fd349c02 JH |
1183 | reason = smp_cmd_ident_addr_info(conn, skb); |
1184 | break; | |
1185 | ||
eb492e01 | 1186 | case SMP_CMD_SIGN_INFO: |
7ee4ea36 | 1187 | reason = smp_cmd_sign_info(conn, skb); |
7034b911 VCG |
1188 | break; |
1189 | ||
eb492e01 AB |
1190 | default: |
1191 | BT_DBG("Unknown command code 0x%2.2x", code); | |
1192 | ||
1193 | reason = SMP_CMD_NOTSUPP; | |
eb492e01 | 1194 | err = -EOPNOTSUPP; |
3a0259bb | 1195 | goto done; |
eb492e01 AB |
1196 | } |
1197 | ||
3a0259bb VCG |
1198 | done: |
1199 | if (reason) | |
84794e11 | 1200 | smp_failure(conn, reason); |
3a0259bb | 1201 | |
eb492e01 AB |
1202 | kfree_skb(skb); |
1203 | return err; | |
1204 | } | |
7034b911 | 1205 | |
35d70271 JH |
1206 | static void smp_notify_keys(struct l2cap_conn *conn) |
1207 | { | |
1208 | struct smp_chan *smp = conn->smp_chan; | |
1209 | struct hci_conn *hcon = conn->hcon; | |
1210 | struct hci_dev *hdev = hcon->hdev; | |
53ac6ab6 MH |
1211 | struct smp_cmd_pairing *req = (void *) &smp->preq[1]; |
1212 | struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1]; | |
1213 | bool persistent; | |
35d70271 | 1214 | |
61b1a7fb | 1215 | if (smp->remote_irk) { |
95fbac8a | 1216 | mgmt_new_irk(hdev, smp->remote_irk); |
61b1a7fb JH |
1217 | /* Now that user space can be considered to know the |
1218 | * identity address track the connection based on it | |
1219 | * from now on. | |
1220 | */ | |
1221 | bacpy(&hcon->dst, &smp->remote_irk->bdaddr); | |
1222 | hcon->dst_type = smp->remote_irk->addr_type; | |
1223 | l2cap_conn_update_id_addr(hcon); | |
1224 | } | |
95fbac8a | 1225 | |
53ac6ab6 MH |
1226 | /* The LTKs and CSRKs should be persistent only if both sides |
1227 | * had the bonding bit set in their authentication requests. | |
1228 | */ | |
1229 | persistent = !!((req->auth_req & rsp->auth_req) & SMP_AUTH_BONDING); | |
1230 | ||
7ee4ea36 MH |
1231 | if (smp->csrk) { |
1232 | smp->csrk->bdaddr_type = hcon->dst_type; | |
1233 | bacpy(&smp->csrk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1234 | mgmt_new_csrk(hdev, smp->csrk, persistent); |
7ee4ea36 MH |
1235 | } |
1236 | ||
1237 | if (smp->slave_csrk) { | |
1238 | smp->slave_csrk->bdaddr_type = hcon->dst_type; | |
1239 | bacpy(&smp->slave_csrk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1240 | mgmt_new_csrk(hdev, smp->slave_csrk, persistent); |
7ee4ea36 MH |
1241 | } |
1242 | ||
35d70271 JH |
1243 | if (smp->ltk) { |
1244 | smp->ltk->bdaddr_type = hcon->dst_type; | |
1245 | bacpy(&smp->ltk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1246 | mgmt_new_ltk(hdev, smp->ltk, persistent); |
35d70271 JH |
1247 | } |
1248 | ||
1249 | if (smp->slave_ltk) { | |
1250 | smp->slave_ltk->bdaddr_type = hcon->dst_type; | |
1251 | bacpy(&smp->slave_ltk->bdaddr, &hcon->dst); | |
53ac6ab6 | 1252 | mgmt_new_ltk(hdev, smp->slave_ltk, persistent); |
35d70271 JH |
1253 | } |
1254 | } | |
1255 | ||
4bd6d38e | 1256 | int smp_distribute_keys(struct l2cap_conn *conn) |
7034b911 VCG |
1257 | { |
1258 | struct smp_cmd_pairing *req, *rsp; | |
1c1def09 | 1259 | struct smp_chan *smp = conn->smp_chan; |
524237cb JH |
1260 | struct hci_conn *hcon = conn->hcon; |
1261 | struct hci_dev *hdev = hcon->hdev; | |
7034b911 VCG |
1262 | __u8 *keydist; |
1263 | ||
4bd6d38e | 1264 | BT_DBG("conn %p", conn); |
7034b911 | 1265 | |
524237cb | 1266 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) |
d26a2345 VCG |
1267 | return 0; |
1268 | ||
1c1def09 | 1269 | rsp = (void *) &smp->prsp[1]; |
7034b911 VCG |
1270 | |
1271 | /* The responder sends its keys first */ | |
efabba37 | 1272 | if (hcon->out && (smp->remote_key_dist & 0x07)) |
7034b911 VCG |
1273 | return 0; |
1274 | ||
1c1def09 | 1275 | req = (void *) &smp->preq[1]; |
7034b911 | 1276 | |
524237cb | 1277 | if (hcon->out) { |
7034b911 VCG |
1278 | keydist = &rsp->init_key_dist; |
1279 | *keydist &= req->init_key_dist; | |
1280 | } else { | |
1281 | keydist = &rsp->resp_key_dist; | |
1282 | *keydist &= req->resp_key_dist; | |
1283 | } | |
1284 | ||
7034b911 VCG |
1285 | BT_DBG("keydist 0x%x", *keydist); |
1286 | ||
1287 | if (*keydist & SMP_DIST_ENC_KEY) { | |
1288 | struct smp_cmd_encrypt_info enc; | |
1289 | struct smp_cmd_master_ident ident; | |
23d0e128 | 1290 | struct smp_ltk *ltk; |
c9839a11 | 1291 | u8 authenticated; |
7034b911 | 1292 | __le16 ediv; |
fe39c7b2 | 1293 | __le64 rand; |
7034b911 VCG |
1294 | |
1295 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); | |
1296 | get_random_bytes(&ediv, sizeof(ediv)); | |
fe39c7b2 | 1297 | get_random_bytes(&rand, sizeof(rand)); |
7034b911 VCG |
1298 | |
1299 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); | |
1300 | ||
c9839a11 | 1301 | authenticated = hcon->sec_level == BT_SECURITY_HIGH; |
524237cb | 1302 | ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, |
35d70271 | 1303 | HCI_SMP_LTK_SLAVE, authenticated, enc.ltk, |
fe39c7b2 | 1304 | smp->enc_key_size, ediv, rand); |
23d0e128 | 1305 | smp->slave_ltk = ltk; |
16b90839 | 1306 | |
58115373 | 1307 | ident.ediv = ediv; |
fe39c7b2 | 1308 | ident.rand = rand; |
7034b911 VCG |
1309 | |
1310 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); | |
1311 | ||
1312 | *keydist &= ~SMP_DIST_ENC_KEY; | |
1313 | } | |
1314 | ||
1315 | if (*keydist & SMP_DIST_ID_KEY) { | |
1316 | struct smp_cmd_ident_addr_info addrinfo; | |
1317 | struct smp_cmd_ident_info idinfo; | |
1318 | ||
863efaf2 | 1319 | memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk)); |
7034b911 VCG |
1320 | |
1321 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); | |
1322 | ||
82d4b359 JH |
1323 | /* The hci_conn contains the local identity address |
1324 | * after the connection has been established. | |
1325 | * | |
1326 | * This is true even when the connection has been | |
1327 | * established using a resolvable random address. | |
1328 | */ | |
524237cb | 1329 | bacpy(&addrinfo.bdaddr, &hcon->src); |
82d4b359 | 1330 | addrinfo.addr_type = hcon->src_type; |
7034b911 VCG |
1331 | |
1332 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), | |
f1560463 | 1333 | &addrinfo); |
7034b911 VCG |
1334 | |
1335 | *keydist &= ~SMP_DIST_ID_KEY; | |
1336 | } | |
1337 | ||
1338 | if (*keydist & SMP_DIST_SIGN) { | |
1339 | struct smp_cmd_sign_info sign; | |
7ee4ea36 | 1340 | struct smp_csrk *csrk; |
7034b911 | 1341 | |
7ee4ea36 | 1342 | /* Generate a new random key */ |
7034b911 VCG |
1343 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); |
1344 | ||
7ee4ea36 MH |
1345 | csrk = kzalloc(sizeof(*csrk), GFP_KERNEL); |
1346 | if (csrk) { | |
1347 | csrk->master = 0x00; | |
1348 | memcpy(csrk->val, sign.csrk, sizeof(csrk->val)); | |
1349 | } | |
1350 | smp->slave_csrk = csrk; | |
1351 | ||
7034b911 VCG |
1352 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); |
1353 | ||
1354 | *keydist &= ~SMP_DIST_SIGN; | |
1355 | } | |
1356 | ||
efabba37 JH |
1357 | /* If there are still keys to be received wait for them */ |
1358 | if ((smp->remote_key_dist & 0x07)) | |
1359 | return 0; | |
1360 | ||
1d98bf4f JH |
1361 | clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags); |
1362 | cancel_delayed_work_sync(&conn->security_timer); | |
4a74d658 | 1363 | set_bit(SMP_FLAG_COMPLETE, &smp->flags); |
1d98bf4f | 1364 | smp_notify_keys(conn); |
efabba37 | 1365 | |
1d98bf4f | 1366 | smp_chan_destroy(conn); |
d26a2345 | 1367 | |
7034b911 VCG |
1368 | return 0; |
1369 | } |