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Anderson Brigliaeb492e02011-06-09 18:50:40 -03001/*
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
Marcel Holtmann300acfde2014-12-31 14:43:16 -080023#include <linux/debugfs.h>
Gustavo Padovan8c520a52012-05-23 04:04:22 -030024#include <linux/scatterlist.h>
Andy Lutomirskia4770e12016-06-26 14:55:23 -070025#include <linux/crypto.h>
Gustavo Padovan8c520a52012-05-23 04:04:22 -030026#include <crypto/b128ops.h>
Herbert Xu71af2f62016-01-24 21:18:30 +080027#include <crypto/hash.h>
Gustavo Padovan8c520a52012-05-23 04:04:22 -030028
Anderson Brigliaeb492e02011-06-09 18:50:40 -030029#include <net/bluetooth/bluetooth.h>
30#include <net/bluetooth/hci_core.h>
31#include <net/bluetooth/l2cap.h>
Brian Gix2b64d152011-12-21 16:12:12 -080032#include <net/bluetooth/mgmt.h>
Marcel Holtmannac4b7232013-10-10 14:54:16 -070033
Johan Hedberg3b191462014-06-06 10:50:15 +030034#include "ecc.h"
Marcel Holtmannac4b7232013-10-10 14:54:16 -070035#include "smp.h"
Anderson Brigliad22ef0b2011-06-09 18:50:44 -030036
Johan Hedberg2fd36552015-06-11 13:52:26 +030037#define SMP_DEV(hdev) \
38 ((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data)
39
Johan Hedbergc7a3d572014-12-01 22:03:16 +020040/* Low-level debug macros to be used for stuff that we don't want
41 * accidentially in dmesg, i.e. the values of the various crypto keys
42 * and the inputs & outputs of crypto functions.
43 */
44#ifdef DEBUG
45#define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \
46 ##__VA_ARGS__)
47#else
48#define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \
49 ##__VA_ARGS__)
50#endif
51
Johan Hedbergb28b4942014-09-05 22:19:55 +030052#define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd)
Johan Hedbergb28b4942014-09-05 22:19:55 +030053
Johan Hedberg3b191462014-06-06 10:50:15 +030054/* Keys which are not distributed with Secure Connections */
55#define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY);
56
Marcel Holtmann17b02e62012-03-01 14:32:37 -080057#define SMP_TIMEOUT msecs_to_jiffies(30000)
Vinicius Costa Gomes5d3de7d2011-06-14 13:37:41 -030058
Marcel Holtmannd7a5a112015-03-13 02:11:00 -070059#define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \
Johan Hedberg0edb14d2014-05-26 13:29:28 +030060 0x1f : 0x07)
61#define KEY_DIST_MASK 0x07
Johan Hedberg065a13e2012-10-11 16:26:06 +020062
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +030063/* Maximum message length that can be passed to aes_cmac */
64#define CMAC_MSG_MAX 80
65
Johan Hedberg533e35d2014-06-16 19:25:18 +030066enum {
67 SMP_FLAG_TK_VALID,
68 SMP_FLAG_CFM_PENDING,
69 SMP_FLAG_MITM_AUTH,
70 SMP_FLAG_COMPLETE,
71 SMP_FLAG_INITIATOR,
Johan Hedberg65668772014-05-16 11:03:34 +030072 SMP_FLAG_SC,
Johan Hedbergd8f8edb2014-06-06 11:09:28 +030073 SMP_FLAG_REMOTE_PK,
Johan Hedbergaeb7d462014-05-31 18:52:28 +030074 SMP_FLAG_DEBUG_KEY,
Johan Hedberg38606f12014-06-25 11:10:28 +030075 SMP_FLAG_WAIT_USER,
Johan Hedbergd3e54a82014-06-04 11:07:40 +030076 SMP_FLAG_DHKEY_PENDING,
Johan Hedberg1a8bab42015-03-16 11:45:44 +020077 SMP_FLAG_REMOTE_OOB,
78 SMP_FLAG_LOCAL_OOB,
Johan Hedberg533e35d2014-06-16 19:25:18 +030079};
Johan Hedberg4bc58f52014-05-20 09:45:47 +030080
Marcel Holtmann88a479d2015-03-16 01:10:19 -070081struct smp_dev {
Marcel Holtmann60a27d62015-03-16 01:10:22 -070082 /* Secure Connections OOB data */
83 u8 local_pk[64];
84 u8 local_sk[32];
Marcel Holtmannfb334fe2015-03-16 12:34:57 -070085 u8 local_rand[16];
Marcel Holtmann60a27d62015-03-16 01:10:22 -070086 bool debug_key;
87
Johan Hedbergb1f663c2015-06-11 13:52:27 +030088 u8 min_key_size;
Johan Hedberg2fd36552015-06-11 13:52:26 +030089 u8 max_key_size;
90
Andy Lutomirskia4770e12016-06-26 14:55:23 -070091 struct crypto_cipher *tfm_aes;
Herbert Xu71af2f62016-01-24 21:18:30 +080092 struct crypto_shash *tfm_cmac;
Marcel Holtmann88a479d2015-03-16 01:10:19 -070093};
94
Johan Hedberg4bc58f52014-05-20 09:45:47 +030095struct smp_chan {
Johan Hedbergb68fda62014-08-11 22:06:40 +030096 struct l2cap_conn *conn;
97 struct delayed_work security_timer;
Johan Hedbergb28b4942014-09-05 22:19:55 +030098 unsigned long allow_cmd; /* Bitmask of allowed commands */
Johan Hedbergb68fda62014-08-11 22:06:40 +030099
Johan Hedberg4bc58f52014-05-20 09:45:47 +0300100 u8 preq[7]; /* SMP Pairing Request */
101 u8 prsp[7]; /* SMP Pairing Response */
102 u8 prnd[16]; /* SMP Pairing Random (local) */
103 u8 rrnd[16]; /* SMP Pairing Random (remote) */
104 u8 pcnf[16]; /* SMP Pairing Confirm */
105 u8 tk[16]; /* SMP Temporary Key */
Johan Hedberg882fafa2015-03-16 11:45:43 +0200106 u8 rr[16]; /* Remote OOB ra/rb value */
107 u8 lr[16]; /* Local OOB ra/rb value */
Johan Hedberg4bc58f52014-05-20 09:45:47 +0300108 u8 enc_key_size;
109 u8 remote_key_dist;
110 bdaddr_t id_addr;
111 u8 id_addr_type;
112 u8 irk[16];
113 struct smp_csrk *csrk;
114 struct smp_csrk *slave_csrk;
115 struct smp_ltk *ltk;
116 struct smp_ltk *slave_ltk;
117 struct smp_irk *remote_irk;
Johan Hedberg6a770832014-06-06 11:54:04 +0300118 u8 *link_key;
Johan Hedberg4a74d652014-05-20 09:45:50 +0300119 unsigned long flags;
Johan Hedberg783e0572014-05-31 18:48:26 +0300120 u8 method;
Johan Hedberg38606f12014-06-25 11:10:28 +0300121 u8 passkey_round;
Johan Hedberg6a7bd102014-06-27 14:23:03 +0300122
Johan Hedberg3b191462014-06-06 10:50:15 +0300123 /* Secure Connections variables */
124 u8 local_pk[64];
125 u8 local_sk[32];
Johan Hedbergd8f8edb2014-06-06 11:09:28 +0300126 u8 remote_pk[64];
127 u8 dhkey[32];
Johan Hedberg760b0182014-06-06 11:44:05 +0300128 u8 mackey[16];
Johan Hedberg3b191462014-06-06 10:50:15 +0300129
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700130 struct crypto_cipher *tfm_aes;
Herbert Xu71af2f62016-01-24 21:18:30 +0800131 struct crypto_shash *tfm_cmac;
Johan Hedberg4bc58f52014-05-20 09:45:47 +0300132};
133
Johan Hedbergaeb7d462014-05-31 18:52:28 +0300134/* These debug key values are defined in the SMP section of the core
135 * specification. debug_pk is the public debug key and debug_sk the
136 * private debug key.
137 */
138static const u8 debug_pk[64] = {
139 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
140 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
141 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
142 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20,
143
144 0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74,
145 0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76,
146 0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63,
147 0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc,
148};
149
150static const u8 debug_sk[32] = {
151 0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58,
152 0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a,
153 0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74,
154 0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f,
155};
156
Johan Hedberg8a2936f2014-06-16 19:25:19 +0300157static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300158{
Johan Hedberg8a2936f2014-06-16 19:25:19 +0300159 size_t i;
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300160
Johan Hedberg8a2936f2014-06-16 19:25:19 +0300161 for (i = 0; i < len; i++)
162 dst[len - 1 - i] = src[i];
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300163}
164
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200165/* The following functions map to the LE SC SMP crypto functions
166 * AES-CMAC, f4, f5, f6, g2 and h6.
167 */
168
Herbert Xu71af2f62016-01-24 21:18:30 +0800169static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m,
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300170 size_t len, u8 mac[16])
171{
172 uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
Herbert Xu71af2f62016-01-24 21:18:30 +0800173 SHASH_DESC_ON_STACK(desc, tfm);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300174 int err;
175
176 if (len > CMAC_MSG_MAX)
177 return -EFBIG;
178
179 if (!tfm) {
180 BT_ERR("tfm %p", tfm);
181 return -EINVAL;
182 }
183
Herbert Xu71af2f62016-01-24 21:18:30 +0800184 desc->tfm = tfm;
185 desc->flags = 0;
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300186
187 /* Swap key and message from LSB to MSB */
188 swap_buf(k, tmp, 16);
189 swap_buf(m, msg_msb, len);
190
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200191 SMP_DBG("msg (len %zu) %*phN", len, (int) len, m);
192 SMP_DBG("key %16phN", k);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300193
Herbert Xu71af2f62016-01-24 21:18:30 +0800194 err = crypto_shash_setkey(tfm, tmp, 16);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300195 if (err) {
196 BT_ERR("cipher setkey failed: %d", err);
197 return err;
198 }
199
Herbert Xu71af2f62016-01-24 21:18:30 +0800200 err = crypto_shash_digest(desc, msg_msb, len, mac_msb);
201 shash_desc_zero(desc);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300202 if (err) {
Herbert Xu71af2f62016-01-24 21:18:30 +0800203 BT_ERR("Hash computation error %d", err);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300204 return err;
205 }
206
207 swap_buf(mac_msb, mac, 16);
208
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200209 SMP_DBG("mac %16phN", mac);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300210
211 return 0;
212}
213
Herbert Xu71af2f62016-01-24 21:18:30 +0800214static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32],
215 const u8 v[32], const u8 x[16], u8 z, u8 res[16])
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300216{
217 u8 m[65];
218 int err;
219
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200220 SMP_DBG("u %32phN", u);
221 SMP_DBG("v %32phN", v);
222 SMP_DBG("x %16phN z %02x", x, z);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300223
224 m[0] = z;
225 memcpy(m + 1, v, 32);
226 memcpy(m + 33, u, 32);
227
228 err = aes_cmac(tfm_cmac, x, m, sizeof(m), res);
229 if (err)
230 return err;
231
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200232 SMP_DBG("res %16phN", res);
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +0300233
234 return err;
235}
236
Herbert Xu71af2f62016-01-24 21:18:30 +0800237static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32],
Johan Hedberg4da50de2014-12-29 12:04:10 +0200238 const u8 n1[16], const u8 n2[16], const u8 a1[7],
239 const u8 a2[7], u8 mackey[16], u8 ltk[16])
Johan Hedberg760b0182014-06-06 11:44:05 +0300240{
241 /* The btle, salt and length "magic" values are as defined in
242 * the SMP section of the Bluetooth core specification. In ASCII
243 * the btle value ends up being 'btle'. The salt is just a
244 * random number whereas length is the value 256 in little
245 * endian format.
246 */
247 const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 };
248 const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60,
249 0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c };
250 const u8 length[2] = { 0x00, 0x01 };
251 u8 m[53], t[16];
252 int err;
253
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200254 SMP_DBG("w %32phN", w);
255 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
256 SMP_DBG("a1 %7phN a2 %7phN", a1, a2);
Johan Hedberg760b0182014-06-06 11:44:05 +0300257
258 err = aes_cmac(tfm_cmac, salt, w, 32, t);
259 if (err)
260 return err;
261
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200262 SMP_DBG("t %16phN", t);
Johan Hedberg760b0182014-06-06 11:44:05 +0300263
264 memcpy(m, length, 2);
265 memcpy(m + 2, a2, 7);
266 memcpy(m + 9, a1, 7);
267 memcpy(m + 16, n2, 16);
268 memcpy(m + 32, n1, 16);
269 memcpy(m + 48, btle, 4);
270
271 m[52] = 0; /* Counter */
272
273 err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey);
274 if (err)
275 return err;
276
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200277 SMP_DBG("mackey %16phN", mackey);
Johan Hedberg760b0182014-06-06 11:44:05 +0300278
279 m[52] = 1; /* Counter */
280
281 err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk);
282 if (err)
283 return err;
284
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200285 SMP_DBG("ltk %16phN", ltk);
Johan Hedberg760b0182014-06-06 11:44:05 +0300286
287 return 0;
288}
289
Herbert Xu71af2f62016-01-24 21:18:30 +0800290static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16],
Johan Hedberg4da50de2014-12-29 12:04:10 +0200291 const u8 n1[16], const u8 n2[16], const u8 r[16],
Johan Hedberg760b0182014-06-06 11:44:05 +0300292 const u8 io_cap[3], const u8 a1[7], const u8 a2[7],
293 u8 res[16])
294{
295 u8 m[65];
296 int err;
297
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200298 SMP_DBG("w %16phN", w);
299 SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
300 SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2);
Johan Hedberg760b0182014-06-06 11:44:05 +0300301
302 memcpy(m, a2, 7);
303 memcpy(m + 7, a1, 7);
304 memcpy(m + 14, io_cap, 3);
305 memcpy(m + 17, r, 16);
306 memcpy(m + 33, n2, 16);
307 memcpy(m + 49, n1, 16);
308
309 err = aes_cmac(tfm_cmac, w, m, sizeof(m), res);
310 if (err)
311 return err;
312
Marcel Holtmann203de212014-12-31 20:01:22 -0800313 SMP_DBG("res %16phN", res);
Johan Hedberg760b0182014-06-06 11:44:05 +0300314
315 return err;
316}
317
Herbert Xu71af2f62016-01-24 21:18:30 +0800318static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32],
Johan Hedberg191dc7f2014-06-06 11:39:49 +0300319 const u8 x[16], const u8 y[16], u32 *val)
320{
321 u8 m[80], tmp[16];
322 int err;
323
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200324 SMP_DBG("u %32phN", u);
325 SMP_DBG("v %32phN", v);
326 SMP_DBG("x %16phN y %16phN", x, y);
Johan Hedberg191dc7f2014-06-06 11:39:49 +0300327
328 memcpy(m, y, 16);
329 memcpy(m + 16, v, 32);
330 memcpy(m + 48, u, 32);
331
332 err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
333 if (err)
334 return err;
335
336 *val = get_unaligned_le32(tmp);
337 *val %= 1000000;
338
Johan Hedbergc7a3d572014-12-01 22:03:16 +0200339 SMP_DBG("val %06u", *val);
Johan Hedberg191dc7f2014-06-06 11:39:49 +0300340
341 return 0;
342}
343
Herbert Xu71af2f62016-01-24 21:18:30 +0800344static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16],
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200345 const u8 key_id[4], u8 res[16])
346{
347 int err;
348
349 SMP_DBG("w %16phN key_id %4phN", w, key_id);
350
351 err = aes_cmac(tfm_cmac, w, key_id, 4, res);
352 if (err)
353 return err;
354
355 SMP_DBG("res %16phN", res);
356
357 return err;
358}
359
360/* The following functions map to the legacy SMP crypto functions e, c1,
361 * s1 and ah.
362 */
363
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700364static int smp_e(struct crypto_cipher *tfm, const u8 *k, u8 *r)
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300365{
Johan Hedberg943a7322014-03-18 12:58:24 +0200366 uint8_t tmp[16], data[16];
Johan Hedberg201a5922013-12-02 10:49:04 +0200367 int err;
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300368
Johan Hedberg011c3912015-05-19 21:06:04 +0300369 SMP_DBG("k %16phN r %16phN", k, r);
370
Johan Hedberg7f376cd2014-12-03 16:07:13 +0200371 if (!tfm) {
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300372 BT_ERR("tfm %p", tfm);
373 return -EINVAL;
374 }
375
Johan Hedberg943a7322014-03-18 12:58:24 +0200376 /* The most significant octet of key corresponds to k[0] */
Johan Hedberg8a2936f2014-06-16 19:25:19 +0300377 swap_buf(k, tmp, 16);
Johan Hedberg943a7322014-03-18 12:58:24 +0200378
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700379 err = crypto_cipher_setkey(tfm, tmp, 16);
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300380 if (err) {
381 BT_ERR("cipher setkey failed: %d", err);
382 return err;
383 }
384
Johan Hedberg943a7322014-03-18 12:58:24 +0200385 /* Most significant octet of plaintextData corresponds to data[0] */
Johan Hedberg8a2936f2014-06-16 19:25:19 +0300386 swap_buf(r, data, 16);
Johan Hedberg943a7322014-03-18 12:58:24 +0200387
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700388 crypto_cipher_encrypt_one(tfm, data, data);
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300389
Johan Hedberg943a7322014-03-18 12:58:24 +0200390 /* Most significant octet of encryptedData corresponds to data[0] */
Johan Hedberg8a2936f2014-06-16 19:25:19 +0300391 swap_buf(data, r, 16);
Johan Hedberg943a7322014-03-18 12:58:24 +0200392
Johan Hedberg011c3912015-05-19 21:06:04 +0300393 SMP_DBG("r %16phN", r);
394
Anderson Brigliad22ef0b2011-06-09 18:50:44 -0300395 return err;
396}
397
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700398static int smp_c1(struct crypto_cipher *tfm_aes, const u8 k[16],
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200399 const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
400 const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
401{
402 u8 p1[16], p2[16];
403 int err;
404
Johan Hedberg011c3912015-05-19 21:06:04 +0300405 SMP_DBG("k %16phN r %16phN", k, r);
406 SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra);
407 SMP_DBG("preq %7phN pres %7phN", preq, pres);
408
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200409 memset(p1, 0, 16);
410
411 /* p1 = pres || preq || _rat || _iat */
412 p1[0] = _iat;
413 p1[1] = _rat;
414 memcpy(p1 + 2, preq, 7);
415 memcpy(p1 + 9, pres, 7);
416
Johan Hedberg011c3912015-05-19 21:06:04 +0300417 SMP_DBG("p1 %16phN", p1);
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200418
419 /* res = r XOR p1 */
420 u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
421
422 /* res = e(k, res) */
423 err = smp_e(tfm_aes, k, res);
424 if (err) {
425 BT_ERR("Encrypt data error");
426 return err;
427 }
428
Johan Hedberg011c3912015-05-19 21:06:04 +0300429 /* p2 = padding || ia || ra */
430 memcpy(p2, ra, 6);
431 memcpy(p2 + 6, ia, 6);
432 memset(p2 + 12, 0, 4);
433
434 SMP_DBG("p2 %16phN", p2);
435
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200436 /* res = res XOR p2 */
437 u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
438
439 /* res = e(k, res) */
440 err = smp_e(tfm_aes, k, res);
441 if (err)
442 BT_ERR("Encrypt data error");
443
444 return err;
445}
446
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700447static int smp_s1(struct crypto_cipher *tfm_aes, const u8 k[16],
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200448 const u8 r1[16], const u8 r2[16], u8 _r[16])
Johan Hedberg6a770832014-06-06 11:54:04 +0300449{
450 int err;
451
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200452 /* Just least significant octets from r1 and r2 are considered */
453 memcpy(_r, r2, 8);
454 memcpy(_r + 8, r1, 8);
Johan Hedberg6a770832014-06-06 11:54:04 +0300455
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200456 err = smp_e(tfm_aes, k, _r);
Johan Hedberg6a770832014-06-06 11:54:04 +0300457 if (err)
Johan Hedberg06edf8d2014-12-02 13:39:23 +0200458 BT_ERR("Encrypt data error");
Johan Hedberg6a770832014-06-06 11:54:04 +0300459
460 return err;
461}
462
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700463static int smp_ah(struct crypto_cipher *tfm, const u8 irk[16],
Johan Hedbergcd082792014-12-02 13:37:41 +0200464 const u8 r[3], u8 res[3])
Johan Hedberg60478052014-02-18 10:19:31 +0200465{
Johan Hedberg943a7322014-03-18 12:58:24 +0200466 u8 _res[16];
Johan Hedberg60478052014-02-18 10:19:31 +0200467 int err;
468
469 /* r' = padding || r */
Johan Hedberg943a7322014-03-18 12:58:24 +0200470 memcpy(_res, r, 3);
471 memset(_res + 3, 0, 13);
Johan Hedberg60478052014-02-18 10:19:31 +0200472
Johan Hedberg943a7322014-03-18 12:58:24 +0200473 err = smp_e(tfm, irk, _res);
Johan Hedberg60478052014-02-18 10:19:31 +0200474 if (err) {
475 BT_ERR("Encrypt error");
476 return err;
477 }
478
479 /* The output of the random address function ah is:
Marcel Holtmannc5080d42015-09-04 17:08:18 +0200480 * ah(k, r) = e(k, r') mod 2^24
Johan Hedberg60478052014-02-18 10:19:31 +0200481 * The output of the security function e is then truncated to 24 bits
482 * by taking the least significant 24 bits of the output of e as the
483 * result of ah.
484 */
Johan Hedberg943a7322014-03-18 12:58:24 +0200485 memcpy(res, _res, 3);
Johan Hedberg60478052014-02-18 10:19:31 +0200486
487 return 0;
488}
489
Johan Hedbergcd082792014-12-02 13:37:41 +0200490bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
491 const bdaddr_t *bdaddr)
Johan Hedberg60478052014-02-18 10:19:31 +0200492{
Johan Hedbergdefce9e2014-08-08 09:37:17 +0300493 struct l2cap_chan *chan = hdev->smp_data;
Marcel Holtmann88a479d2015-03-16 01:10:19 -0700494 struct smp_dev *smp;
Johan Hedberg60478052014-02-18 10:19:31 +0200495 u8 hash[3];
496 int err;
497
Johan Hedbergdefce9e2014-08-08 09:37:17 +0300498 if (!chan || !chan->data)
499 return false;
500
Marcel Holtmann88a479d2015-03-16 01:10:19 -0700501 smp = chan->data;
Johan Hedbergdefce9e2014-08-08 09:37:17 +0300502
Johan Hedberg60478052014-02-18 10:19:31 +0200503 BT_DBG("RPA %pMR IRK %*phN", bdaddr, 16, irk);
504
Marcel Holtmann88a479d2015-03-16 01:10:19 -0700505 err = smp_ah(smp->tfm_aes, irk, &bdaddr->b[3], hash);
Johan Hedberg60478052014-02-18 10:19:31 +0200506 if (err)
507 return false;
508
509 return !memcmp(bdaddr->b, hash, 3);
510}
511
Johan Hedbergcd082792014-12-02 13:37:41 +0200512int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
Johan Hedbergb1e2b3a2014-02-23 19:42:19 +0200513{
Johan Hedbergdefce9e2014-08-08 09:37:17 +0300514 struct l2cap_chan *chan = hdev->smp_data;
Marcel Holtmann88a479d2015-03-16 01:10:19 -0700515 struct smp_dev *smp;
Johan Hedbergb1e2b3a2014-02-23 19:42:19 +0200516 int err;
517
Johan Hedbergdefce9e2014-08-08 09:37:17 +0300518 if (!chan || !chan->data)
519 return -EOPNOTSUPP;
520
Marcel Holtmann88a479d2015-03-16 01:10:19 -0700521 smp = chan->data;
Johan Hedbergdefce9e2014-08-08 09:37:17 +0300522
Johan Hedbergb1e2b3a2014-02-23 19:42:19 +0200523 get_random_bytes(&rpa->b[3], 3);
524
525 rpa->b[5] &= 0x3f; /* Clear two most significant bits */
526 rpa->b[5] |= 0x40; /* Set second most significant bit */
527
Marcel Holtmann88a479d2015-03-16 01:10:19 -0700528 err = smp_ah(smp->tfm_aes, irk, &rpa->b[3], rpa->b);
Johan Hedbergb1e2b3a2014-02-23 19:42:19 +0200529 if (err < 0)
530 return err;
531
532 BT_DBG("RPA %pMR", rpa);
533
534 return 0;
535}
536
Marcel Holtmann60a27d62015-03-16 01:10:22 -0700537int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
538{
539 struct l2cap_chan *chan = hdev->smp_data;
540 struct smp_dev *smp;
541 int err;
542
543 if (!chan || !chan->data)
544 return -EOPNOTSUPP;
545
546 smp = chan->data;
547
548 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
549 BT_DBG("Using debug keys");
550 memcpy(smp->local_pk, debug_pk, 64);
551 memcpy(smp->local_sk, debug_sk, 32);
552 smp->debug_key = true;
553 } else {
554 while (true) {
555 /* Generate local key pair for Secure Connections */
556 if (!ecc_make_key(smp->local_pk, smp->local_sk))
557 return -EIO;
558
559 /* This is unlikely, but we need to check that
560 * we didn't accidentially generate a debug key.
561 */
562 if (memcmp(smp->local_sk, debug_sk, 32))
563 break;
564 }
565 smp->debug_key = false;
566 }
567
568 SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
569 SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
570 SMP_DBG("OOB Private Key: %32phN", smp->local_sk);
571
Marcel Holtmannfb334fe2015-03-16 12:34:57 -0700572 get_random_bytes(smp->local_rand, 16);
Marcel Holtmann60a27d62015-03-16 01:10:22 -0700573
574 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
Marcel Holtmannfb334fe2015-03-16 12:34:57 -0700575 smp->local_rand, 0, hash);
Marcel Holtmann60a27d62015-03-16 01:10:22 -0700576 if (err < 0)
577 return err;
578
Marcel Holtmannfb334fe2015-03-16 12:34:57 -0700579 memcpy(rand, smp->local_rand, 16);
Marcel Holtmann60a27d62015-03-16 01:10:22 -0700580
581 return 0;
582}
583
Anderson Brigliaeb492e02011-06-09 18:50:40 -0300584static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
585{
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300586 struct l2cap_chan *chan = conn->smp;
Johan Hedbergb68fda62014-08-11 22:06:40 +0300587 struct smp_chan *smp;
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300588 struct kvec iv[2];
589 struct msghdr msg;
590
591 if (!chan)
592 return;
Anderson Brigliaeb492e02011-06-09 18:50:40 -0300593
594 BT_DBG("code 0x%2.2x", code);
595
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300596 iv[0].iov_base = &code;
597 iv[0].iov_len = 1;
Anderson Brigliaeb492e02011-06-09 18:50:40 -0300598
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300599 iv[1].iov_base = data;
600 iv[1].iov_len = len;
601
602 memset(&msg, 0, sizeof(msg));
603
Al Viro17836392014-11-24 17:07:38 -0500604 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC, iv, 2, 1 + len);
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300605
606 l2cap_chan_send(chan, &msg, 1 + len);
Vinicius Costa Gomese2dcd112011-08-19 21:06:50 -0300607
Johan Hedbergb68fda62014-08-11 22:06:40 +0300608 if (!chan->data)
609 return;
610
611 smp = chan->data;
612
613 cancel_delayed_work_sync(&smp->security_timer);
Johan Hedberg1b0921d2014-09-05 22:19:48 +0300614 schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
Anderson Brigliaeb492e02011-06-09 18:50:40 -0300615}
616
Johan Hedbergd2eb9e12014-05-16 10:59:06 +0300617static u8 authreq_to_seclevel(u8 authreq)
Brian Gix2b64d152011-12-21 16:12:12 -0800618{
Johan Hedbergd2eb9e12014-05-16 10:59:06 +0300619 if (authreq & SMP_AUTH_MITM) {
620 if (authreq & SMP_AUTH_SC)
621 return BT_SECURITY_FIPS;
622 else
623 return BT_SECURITY_HIGH;
624 } else {
Brian Gix2b64d152011-12-21 16:12:12 -0800625 return BT_SECURITY_MEDIUM;
Johan Hedbergd2eb9e12014-05-16 10:59:06 +0300626 }
Brian Gix2b64d152011-12-21 16:12:12 -0800627}
628
629static __u8 seclevel_to_authreq(__u8 sec_level)
630{
631 switch (sec_level) {
Johan Hedbergd2eb9e12014-05-16 10:59:06 +0300632 case BT_SECURITY_FIPS:
Brian Gix2b64d152011-12-21 16:12:12 -0800633 case BT_SECURITY_HIGH:
634 return SMP_AUTH_MITM | SMP_AUTH_BONDING;
635 case BT_SECURITY_MEDIUM:
636 return SMP_AUTH_BONDING;
637 default:
638 return SMP_AUTH_NONE;
639 }
640}
641
Vinicius Costa Gomesb8e66ea2011-06-09 18:50:52 -0300642static void build_pairing_cmd(struct l2cap_conn *conn,
Marcel Holtmannf1560462013-10-13 05:43:25 -0700643 struct smp_cmd_pairing *req,
644 struct smp_cmd_pairing *rsp, __u8 authreq)
Vinicius Costa Gomesb8e66ea2011-06-09 18:50:52 -0300645{
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300646 struct l2cap_chan *chan = conn->smp;
647 struct smp_chan *smp = chan->data;
Johan Hedbergfd349c02014-02-18 10:19:36 +0200648 struct hci_conn *hcon = conn->hcon;
649 struct hci_dev *hdev = hcon->hdev;
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100650 u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT;
Vinicius Costa Gomes54790f72011-07-07 18:59:38 -0300651
Marcel Holtmannd7a5a112015-03-13 02:11:00 -0700652 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -0700653 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
654 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
Vinicius Costa Gomes54790f72011-07-07 18:59:38 -0300655 authreq |= SMP_AUTH_BONDING;
Brian Gix2b64d152011-12-21 16:12:12 -0800656 } else {
657 authreq &= ~SMP_AUTH_BONDING;
Vinicius Costa Gomes54790f72011-07-07 18:59:38 -0300658 }
659
Marcel Holtmannd7a5a112015-03-13 02:11:00 -0700660 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
Johan Hedbergfd349c02014-02-18 10:19:36 +0200661 remote_dist |= SMP_DIST_ID_KEY;
662
Marcel Holtmannd7a5a112015-03-13 02:11:00 -0700663 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
Johan Hedberg863efaf2014-02-22 19:06:32 +0200664 local_dist |= SMP_DIST_ID_KEY;
665
Marcel Holtmannd7a5a112015-03-13 02:11:00 -0700666 if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100667 (authreq & SMP_AUTH_SC)) {
668 struct oob_data *oob_data;
669 u8 bdaddr_type;
670
Marcel Holtmannd7a5a112015-03-13 02:11:00 -0700671 if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
Johan Hedbergdf8e1a42014-06-06 10:39:56 +0300672 local_dist |= SMP_DIST_LINK_KEY;
673 remote_dist |= SMP_DIST_LINK_KEY;
674 }
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100675
676 if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
677 bdaddr_type = BDADDR_LE_PUBLIC;
678 else
679 bdaddr_type = BDADDR_LE_RANDOM;
680
681 oob_data = hci_find_remote_oob_data(hdev, &hcon->dst,
682 bdaddr_type);
Marcel Holtmann4775a4e2015-01-31 00:15:52 -0800683 if (oob_data && oob_data->present) {
Johan Hedberg1a8bab42015-03-16 11:45:44 +0200684 set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags);
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100685 oob_flag = SMP_OOB_PRESENT;
Johan Hedberga29b0732014-10-28 15:17:05 +0100686 memcpy(smp->rr, oob_data->rand256, 16);
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100687 memcpy(smp->pcnf, oob_data->hash256, 16);
Marcel Holtmannbc07cd62015-03-16 12:34:56 -0700688 SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf);
689 SMP_DBG("OOB Remote Random: %16phN", smp->rr);
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100690 }
691
Johan Hedbergdf8e1a42014-06-06 10:39:56 +0300692 } else {
693 authreq &= ~SMP_AUTH_SC;
694 }
695
Vinicius Costa Gomes54790f72011-07-07 18:59:38 -0300696 if (rsp == NULL) {
697 req->io_capability = conn->hcon->io_capability;
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100698 req->oob_flag = oob_flag;
Johan Hedberg2fd36552015-06-11 13:52:26 +0300699 req->max_key_size = SMP_DEV(hdev)->max_key_size;
Johan Hedbergfd349c02014-02-18 10:19:36 +0200700 req->init_key_dist = local_dist;
701 req->resp_key_dist = remote_dist;
Johan Hedberg0edb14d2014-05-26 13:29:28 +0300702 req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
Johan Hedbergfd349c02014-02-18 10:19:36 +0200703
704 smp->remote_key_dist = remote_dist;
Vinicius Costa Gomes54790f72011-07-07 18:59:38 -0300705 return;
706 }
707
708 rsp->io_capability = conn->hcon->io_capability;
Johan Hedberg02b05bd2014-10-26 21:19:10 +0100709 rsp->oob_flag = oob_flag;
Johan Hedberg2fd36552015-06-11 13:52:26 +0300710 rsp->max_key_size = SMP_DEV(hdev)->max_key_size;
Johan Hedbergfd349c02014-02-18 10:19:36 +0200711 rsp->init_key_dist = req->init_key_dist & remote_dist;
712 rsp->resp_key_dist = req->resp_key_dist & local_dist;
Johan Hedberg0edb14d2014-05-26 13:29:28 +0300713 rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
Johan Hedbergfd349c02014-02-18 10:19:36 +0200714
715 smp->remote_key_dist = rsp->init_key_dist;
Vinicius Costa Gomesb8e66ea2011-06-09 18:50:52 -0300716}
717
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -0300718static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
719{
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300720 struct l2cap_chan *chan = conn->smp;
Johan Hedberg2fd36552015-06-11 13:52:26 +0300721 struct hci_dev *hdev = conn->hcon->hdev;
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300722 struct smp_chan *smp = chan->data;
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -0300723
Johan Hedberg2fd36552015-06-11 13:52:26 +0300724 if (max_key_size > SMP_DEV(hdev)->max_key_size ||
725 max_key_size < SMP_MIN_ENC_KEY_SIZE)
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -0300726 return SMP_ENC_KEY_SIZE;
727
Vinicius Costa Gomesf7aa6112012-01-30 19:29:12 -0300728 smp->enc_key_size = max_key_size;
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -0300729
730 return 0;
731}
732
Johan Hedberg6f48e262014-08-11 22:06:44 +0300733static void smp_chan_destroy(struct l2cap_conn *conn)
734{
735 struct l2cap_chan *chan = conn->smp;
736 struct smp_chan *smp = chan->data;
Johan Hedberg923e2412014-12-03 12:43:39 +0200737 struct hci_conn *hcon = conn->hcon;
Johan Hedberg6f48e262014-08-11 22:06:44 +0300738 bool complete;
739
740 BUG_ON(!smp);
741
742 cancel_delayed_work_sync(&smp->security_timer);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300743
Johan Hedberg6f48e262014-08-11 22:06:44 +0300744 complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
Johan Hedberg923e2412014-12-03 12:43:39 +0200745 mgmt_smp_complete(hcon, complete);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300746
Marcel Holtmann276812e2015-03-16 01:10:18 -0700747 kzfree(smp->csrk);
748 kzfree(smp->slave_csrk);
749 kzfree(smp->link_key);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300750
Andy Lutomirskia4770e12016-06-26 14:55:23 -0700751 crypto_free_cipher(smp->tfm_aes);
Herbert Xu71af2f62016-01-24 21:18:30 +0800752 crypto_free_shash(smp->tfm_cmac);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300753
Johan Hedberg923e2412014-12-03 12:43:39 +0200754 /* Ensure that we don't leave any debug key around if debug key
755 * support hasn't been explicitly enabled.
756 */
757 if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG &&
Marcel Holtmannd7a5a112015-03-13 02:11:00 -0700758 !hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) {
Johan Hedberg923e2412014-12-03 12:43:39 +0200759 list_del_rcu(&smp->ltk->list);
760 kfree_rcu(smp->ltk, rcu);
761 smp->ltk = NULL;
762 }
763
Johan Hedberg6f48e262014-08-11 22:06:44 +0300764 /* If pairing failed clean up any keys we might have */
765 if (!complete) {
766 if (smp->ltk) {
Johan Hedberg970d0f12014-11-13 14:37:47 +0200767 list_del_rcu(&smp->ltk->list);
768 kfree_rcu(smp->ltk, rcu);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300769 }
770
771 if (smp->slave_ltk) {
Johan Hedberg970d0f12014-11-13 14:37:47 +0200772 list_del_rcu(&smp->slave_ltk->list);
773 kfree_rcu(smp->slave_ltk, rcu);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300774 }
775
776 if (smp->remote_irk) {
Johan Hedbergadae20c2014-11-13 14:37:48 +0200777 list_del_rcu(&smp->remote_irk->list);
778 kfree_rcu(smp->remote_irk, rcu);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300779 }
780 }
781
782 chan->data = NULL;
Marcel Holtmann276812e2015-03-16 01:10:18 -0700783 kzfree(smp);
Johan Hedberg923e2412014-12-03 12:43:39 +0200784 hci_conn_drop(hcon);
Johan Hedberg6f48e262014-08-11 22:06:44 +0300785}
786
Johan Hedberg84794e12013-11-06 11:24:57 +0200787static void smp_failure(struct l2cap_conn *conn, u8 reason)
Brian Gix4f957a72011-11-23 08:28:36 -0800788{
Johan Hedbergbab73cb2012-02-09 16:07:29 +0200789 struct hci_conn *hcon = conn->hcon;
Johan Hedbergb68fda62014-08-11 22:06:40 +0300790 struct l2cap_chan *chan = conn->smp;
Johan Hedbergbab73cb2012-02-09 16:07:29 +0200791
Johan Hedberg84794e12013-11-06 11:24:57 +0200792 if (reason)
Brian Gix4f957a72011-11-23 08:28:36 -0800793 smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
Marcel Holtmannf1560462013-10-13 05:43:25 -0700794 &reason);
Brian Gix4f957a72011-11-23 08:28:36 -0800795
Johan Hedberge1e930f2014-09-08 17:09:49 -0700796 mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE);
Vinicius Costa Gomesf1c09c02012-02-01 18:27:56 -0300797
Johan Hedbergfc75cc82014-09-05 22:19:52 +0300798 if (chan->data)
Vinicius Costa Gomesf1c09c02012-02-01 18:27:56 -0300799 smp_chan_destroy(conn);
Brian Gix4f957a72011-11-23 08:28:36 -0800800}
801
Brian Gix2b64d152011-12-21 16:12:12 -0800802#define JUST_WORKS 0x00
803#define JUST_CFM 0x01
804#define REQ_PASSKEY 0x02
805#define CFM_PASSKEY 0x03
806#define REQ_OOB 0x04
Johan Hedberg5e3d3d92014-05-31 18:51:02 +0300807#define DSP_PASSKEY 0x05
Brian Gix2b64d152011-12-21 16:12:12 -0800808#define OVERLAP 0xFF
809
810static const u8 gen_method[5][5] = {
811 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
812 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
813 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
814 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
815 { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
816};
817
Johan Hedberg5e3d3d92014-05-31 18:51:02 +0300818static const u8 sc_method[5][5] = {
819 { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
820 { JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
821 { DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY },
822 { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
823 { DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
824};
825
Johan Hedberg581370c2014-06-17 13:07:38 +0300826static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io)
827{
Johan Hedberg2bcd4002014-07-09 19:18:09 +0300828 /* If either side has unknown io_caps, use JUST_CFM (which gets
829 * converted later to JUST_WORKS if we're initiators.
830 */
Johan Hedberg581370c2014-06-17 13:07:38 +0300831 if (local_io > SMP_IO_KEYBOARD_DISPLAY ||
832 remote_io > SMP_IO_KEYBOARD_DISPLAY)
Johan Hedberg2bcd4002014-07-09 19:18:09 +0300833 return JUST_CFM;
Johan Hedberg581370c2014-06-17 13:07:38 +0300834
Johan Hedberg5e3d3d92014-05-31 18:51:02 +0300835 if (test_bit(SMP_FLAG_SC, &smp->flags))
836 return sc_method[remote_io][local_io];
837
Johan Hedberg581370c2014-06-17 13:07:38 +0300838 return gen_method[remote_io][local_io];
839}
840
Brian Gix2b64d152011-12-21 16:12:12 -0800841static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
842 u8 local_io, u8 remote_io)
843{
844 struct hci_conn *hcon = conn->hcon;
Johan Hedberg5d88cc72014-08-08 09:37:18 +0300845 struct l2cap_chan *chan = conn->smp;
846 struct smp_chan *smp = chan->data;
Brian Gix2b64d152011-12-21 16:12:12 -0800847 u32 passkey = 0;
848 int ret = 0;
849
850 /* Initialize key for JUST WORKS */
851 memset(smp->tk, 0, sizeof(smp->tk));
Johan Hedberg4a74d652014-05-20 09:45:50 +0300852 clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
Brian Gix2b64d152011-12-21 16:12:12 -0800853
854 BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io);
855
Johan Hedberg2bcd4002014-07-09 19:18:09 +0300856 /* If neither side wants MITM, either "just" confirm an incoming
857 * request or use just-works for outgoing ones. The JUST_CFM
858 * will be converted to JUST_WORKS if necessary later in this
859 * function. If either side has MITM look up the method from the
860 * table.
861 */
Johan Hedberg581370c2014-06-17 13:07:38 +0300862 if (!(auth & SMP_AUTH_MITM))
Johan Hedberg783e0572014-05-31 18:48:26 +0300863 smp->method = JUST_CFM;
Brian Gix2b64d152011-12-21 16:12:12 -0800864 else
Johan Hedberg783e0572014-05-31 18:48:26 +0300865 smp->method = get_auth_method(smp, local_io, remote_io);
Brian Gix2b64d152011-12-21 16:12:12 -0800866
Johan Hedberga82505c2014-03-24 14:39:07 +0200867 /* Don't confirm locally initiated pairing attempts */
Johan Hedberg783e0572014-05-31 18:48:26 +0300868 if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
869 &smp->flags))
870 smp->method = JUST_WORKS;
Johan Hedberga82505c2014-03-24 14:39:07 +0200871
Johan Hedberg02f3e252014-07-16 15:09:13 +0300872 /* Don't bother user space with no IO capabilities */
Johan Hedberg783e0572014-05-31 18:48:26 +0300873 if (smp->method == JUST_CFM &&
874 hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
875 smp->method = JUST_WORKS;
Johan Hedberg02f3e252014-07-16 15:09:13 +0300876
Brian Gix2b64d152011-12-21 16:12:12 -0800877 /* If Just Works, Continue with Zero TK */
Johan Hedberg783e0572014-05-31 18:48:26 +0300878 if (smp->method == JUST_WORKS) {
Johan Hedberg4a74d652014-05-20 09:45:50 +0300879 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
Brian Gix2b64d152011-12-21 16:12:12 -0800880 return 0;
881 }
882
Johan Hedberg19c5ce92015-03-15 19:34:04 +0200883 /* If this function is used for SC -> legacy fallback we
884 * can only recover the just-works case.
885 */
886 if (test_bit(SMP_FLAG_SC, &smp->flags))
887 return -EINVAL;
888
Brian Gix2b64d152011-12-21 16:12:12 -0800889 /* Not Just Works/Confirm results in MITM Authentication */
Johan Hedberg783e0572014-05-31 18:48:26 +0300890 if (smp->method != JUST_CFM) {
Johan Hedberg4a74d652014-05-20 09:45:50 +0300891 set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
Johan Hedberg5eb596f2014-09-18 11:26:32 +0300892 if (hcon->pending_sec_level < BT_SECURITY_HIGH)
893 hcon->pending_sec_level = BT_SECURITY_HIGH;
894 }
Brian Gix2b64d152011-12-21 16:12:12 -0800895
896 /* If both devices have Keyoard-Display I/O, the master
897 * Confirms and the slave Enters the passkey.
898 */
Johan Hedberg783e0572014-05-31 18:48:26 +0300899 if (smp->method == OVERLAP) {
Johan Hedberg40bef302014-07-16 11:42:27 +0300900 if (hcon->role == HCI_ROLE_MASTER)
Johan Hedberg783e0572014-05-31 18:48:26 +0300901 smp->method = CFM_PASSKEY;
Brian Gix2b64d152011-12-21 16:12:12 -0800902 else
Johan Hedberg783e0572014-05-31 18:48:26 +0300903 smp->method = REQ_PASSKEY;
Brian Gix2b64d152011-12-21 16:12:12 -0800904 }
905
Johan Hedberg01ad34d2014-03-19 14:14:53 +0200906 /* Generate random passkey. */
Johan Hedberg783e0572014-05-31 18:48:26 +0300907 if (smp->method == CFM_PASSKEY) {
Johan Hedberg943a7322014-03-18 12:58:24 +0200908 memset(smp->tk, 0, sizeof(smp->tk));
Brian Gix2b64d152011-12-21 16:12:12 -0800909 get_random_bytes(&passkey, sizeof(passkey));
910 passkey %= 1000000;
Johan Hedberg943a7322014-03-18 12:58:24 +0200911 put_unaligned_le32(passkey, smp->tk);
Brian Gix2b64d152011-12-21 16:12:12 -0800912 BT_DBG("PassKey: %d", passkey);
Johan Hedberg4a74d652014-05-20 09:45:50 +0300913 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
Brian Gix2b64d152011-12-21 16:12:12 -0800914 }
915
Johan Hedberg783e0572014-05-31 18:48:26 +0300916 if (smp->method == REQ_PASSKEY)
Marcel Holtmannce39fb42013-10-13 02:23:39 -0700917 ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst,
Johan Hedberg272d90d2012-02-09 15:26:12 +0200918 hcon->type, hcon->dst_type);
Johan Hedberg783e0572014-05-31 18:48:26 +0300919 else if (smp->method == JUST_CFM)
Johan Hedberg4eb65e62014-03-24 14:39:05 +0200920 ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
921 hcon->type, hcon->dst_type,
922 passkey, 1);
Brian Gix2b64d152011-12-21 16:12:12 -0800923 else
Johan Hedberg01ad34d2014-03-19 14:14:53 +0200924 ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst,
Johan Hedberg272d90d2012-02-09 15:26:12 +0200925 hcon->type, hcon->dst_type,
Johan Hedberg39adbff2014-03-20 08:18:14 +0200926 passkey, 0);
Brian Gix2b64d152011-12-21 16:12:12 -0800927
Brian Gix2b64d152011-12-21 16:12:12 -0800928 return ret;
929}
930
Johan Hedberg1cc61142014-05-20 09:45:52 +0300931static u8 smp_confirm(struct smp_chan *smp)
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300932{
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300933 struct l2cap_conn *conn = smp->conn;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300934 struct smp_cmd_pairing_confirm cp;
935 int ret;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300936
937 BT_DBG("conn %p", conn);
938
Johan Hedberge491eaf2014-10-25 21:15:37 +0200939 ret = smp_c1(smp->tfm_aes, smp->tk, smp->prnd, smp->preq, smp->prsp,
Johan Hedbergb1cd5fd2014-02-28 12:54:17 +0200940 conn->hcon->init_addr_type, &conn->hcon->init_addr,
Johan Hedberg943a7322014-03-18 12:58:24 +0200941 conn->hcon->resp_addr_type, &conn->hcon->resp_addr,
942 cp.confirm_val);
Johan Hedberg1cc61142014-05-20 09:45:52 +0300943 if (ret)
944 return SMP_UNSPECIFIED;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300945
Johan Hedberg4a74d652014-05-20 09:45:50 +0300946 clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
Brian Gix2b64d152011-12-21 16:12:12 -0800947
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300948 smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
949
Johan Hedbergb28b4942014-09-05 22:19:55 +0300950 if (conn->hcon->out)
951 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
952 else
953 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
954
Johan Hedberg1cc61142014-05-20 09:45:52 +0300955 return 0;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300956}
957
Johan Hedberg861580a2014-05-20 09:45:51 +0300958static u8 smp_random(struct smp_chan *smp)
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300959{
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300960 struct l2cap_conn *conn = smp->conn;
961 struct hci_conn *hcon = conn->hcon;
Johan Hedberg861580a2014-05-20 09:45:51 +0300962 u8 confirm[16];
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300963 int ret;
964
Johan Hedbergec70f362014-06-27 14:23:04 +0300965 if (IS_ERR_OR_NULL(smp->tfm_aes))
Johan Hedberg861580a2014-05-20 09:45:51 +0300966 return SMP_UNSPECIFIED;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300967
968 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
969
Johan Hedberge491eaf2014-10-25 21:15:37 +0200970 ret = smp_c1(smp->tfm_aes, smp->tk, smp->rrnd, smp->preq, smp->prsp,
Johan Hedbergb1cd5fd2014-02-28 12:54:17 +0200971 hcon->init_addr_type, &hcon->init_addr,
Johan Hedberg943a7322014-03-18 12:58:24 +0200972 hcon->resp_addr_type, &hcon->resp_addr, confirm);
Johan Hedberg861580a2014-05-20 09:45:51 +0300973 if (ret)
974 return SMP_UNSPECIFIED;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300975
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300976 if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
977 BT_ERR("Pairing failed (confirmation values mismatch)");
Johan Hedberg861580a2014-05-20 09:45:51 +0300978 return SMP_CONFIRM_FAILED;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300979 }
980
981 if (hcon->out) {
Marcel Holtmannfe39c7b2014-02-27 16:00:28 -0800982 u8 stk[16];
983 __le64 rand = 0;
984 __le16 ediv = 0;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300985
Johan Hedberge491eaf2014-10-25 21:15:37 +0200986 smp_s1(smp->tfm_aes, smp->tk, smp->rrnd, smp->prnd, stk);
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300987
Johan Hedberg861580a2014-05-20 09:45:51 +0300988 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
989 return SMP_UNSPECIFIED;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300990
Johan Hedberg8b76ce32015-06-08 18:14:39 +0300991 hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size);
Vinicius Costa Gomesf7aa6112012-01-30 19:29:12 -0300992 hcon->enc_key_size = smp->enc_key_size;
Johan Hedbergfe59a052014-07-01 19:14:12 +0300993 set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300994 } else {
Johan Hedbergfff34902014-06-10 15:19:50 +0300995 u8 stk[16], auth;
Marcel Holtmannfe39c7b2014-02-27 16:00:28 -0800996 __le64 rand = 0;
997 __le16 ediv = 0;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -0300998
Johan Hedberg943a7322014-03-18 12:58:24 +0200999 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
1000 smp->prnd);
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001001
Johan Hedberge491eaf2014-10-25 21:15:37 +02001002 smp_s1(smp->tfm_aes, smp->tk, smp->prnd, smp->rrnd, stk);
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001003
Johan Hedbergfff34902014-06-10 15:19:50 +03001004 if (hcon->pending_sec_level == BT_SECURITY_HIGH)
1005 auth = 1;
1006 else
1007 auth = 0;
1008
Johan Hedberg7d5843b2014-06-16 19:25:15 +03001009 /* Even though there's no _SLAVE suffix this is the
1010 * slave STK we're adding for later lookup (the master
1011 * STK never needs to be stored).
1012 */
Marcel Holtmannce39fb42013-10-13 02:23:39 -07001013 hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
Johan Hedberg2ceba532014-06-16 19:25:16 +03001014 SMP_STK, auth, stk, smp->enc_key_size, ediv, rand);
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001015 }
1016
Johan Hedberg861580a2014-05-20 09:45:51 +03001017 return 0;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001018}
1019
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001020static void smp_notify_keys(struct l2cap_conn *conn)
1021{
1022 struct l2cap_chan *chan = conn->smp;
1023 struct smp_chan *smp = chan->data;
1024 struct hci_conn *hcon = conn->hcon;
1025 struct hci_dev *hdev = hcon->hdev;
1026 struct smp_cmd_pairing *req = (void *) &smp->preq[1];
1027 struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1];
1028 bool persistent;
1029
Johan Hedbergcad20c22015-10-12 13:36:19 +02001030 if (hcon->type == ACL_LINK) {
1031 if (hcon->key_type == HCI_LK_DEBUG_COMBINATION)
1032 persistent = false;
1033 else
1034 persistent = !test_bit(HCI_CONN_FLUSH_KEY,
1035 &hcon->flags);
1036 } else {
1037 /* The LTKs, IRKs and CSRKs should be persistent only if
1038 * both sides had the bonding bit set in their
1039 * authentication requests.
1040 */
1041 persistent = !!((req->auth_req & rsp->auth_req) &
1042 SMP_AUTH_BONDING);
1043 }
1044
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001045 if (smp->remote_irk) {
Johan Hedbergcad20c22015-10-12 13:36:19 +02001046 mgmt_new_irk(hdev, smp->remote_irk, persistent);
1047
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001048 /* Now that user space can be considered to know the
1049 * identity address track the connection based on it
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001050 * from now on (assuming this is an LE link).
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001051 */
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001052 if (hcon->type == LE_LINK) {
1053 bacpy(&hcon->dst, &smp->remote_irk->bdaddr);
1054 hcon->dst_type = smp->remote_irk->addr_type;
1055 queue_work(hdev->workqueue, &conn->id_addr_update_work);
1056 }
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001057 }
1058
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001059 if (smp->csrk) {
1060 smp->csrk->bdaddr_type = hcon->dst_type;
1061 bacpy(&smp->csrk->bdaddr, &hcon->dst);
1062 mgmt_new_csrk(hdev, smp->csrk, persistent);
1063 }
1064
1065 if (smp->slave_csrk) {
1066 smp->slave_csrk->bdaddr_type = hcon->dst_type;
1067 bacpy(&smp->slave_csrk->bdaddr, &hcon->dst);
1068 mgmt_new_csrk(hdev, smp->slave_csrk, persistent);
1069 }
1070
1071 if (smp->ltk) {
1072 smp->ltk->bdaddr_type = hcon->dst_type;
1073 bacpy(&smp->ltk->bdaddr, &hcon->dst);
1074 mgmt_new_ltk(hdev, smp->ltk, persistent);
1075 }
1076
1077 if (smp->slave_ltk) {
1078 smp->slave_ltk->bdaddr_type = hcon->dst_type;
1079 bacpy(&smp->slave_ltk->bdaddr, &hcon->dst);
1080 mgmt_new_ltk(hdev, smp->slave_ltk, persistent);
1081 }
Johan Hedberg6a770832014-06-06 11:54:04 +03001082
1083 if (smp->link_key) {
Johan Hedberge3befab2014-06-01 16:33:39 +03001084 struct link_key *key;
1085 u8 type;
1086
1087 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1088 type = HCI_LK_DEBUG_COMBINATION;
1089 else if (hcon->sec_level == BT_SECURITY_FIPS)
1090 type = HCI_LK_AUTH_COMBINATION_P256;
1091 else
1092 type = HCI_LK_UNAUTH_COMBINATION_P256;
1093
1094 key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst,
1095 smp->link_key, type, 0, &persistent);
1096 if (key) {
1097 mgmt_new_link_key(hdev, key, persistent);
1098
1099 /* Don't keep debug keys around if the relevant
1100 * flag is not set.
1101 */
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001102 if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) &&
Johan Hedberge3befab2014-06-01 16:33:39 +03001103 key->type == HCI_LK_DEBUG_COMBINATION) {
1104 list_del_rcu(&key->list);
1105 kfree_rcu(key, rcu);
1106 }
1107 }
Johan Hedberg6a770832014-06-06 11:54:04 +03001108 }
1109}
1110
Johan Hedbergd3e54a82014-06-04 11:07:40 +03001111static void sc_add_ltk(struct smp_chan *smp)
1112{
1113 struct hci_conn *hcon = smp->conn->hcon;
1114 u8 key_type, auth;
1115
1116 if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
1117 key_type = SMP_LTK_P256_DEBUG;
1118 else
1119 key_type = SMP_LTK_P256;
1120
1121 if (hcon->pending_sec_level == BT_SECURITY_FIPS)
1122 auth = 1;
1123 else
1124 auth = 0;
1125
Johan Hedbergd3e54a82014-06-04 11:07:40 +03001126 smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
1127 key_type, auth, smp->tk, smp->enc_key_size,
1128 0, 0);
1129}
1130
Johan Hedberg6a770832014-06-06 11:54:04 +03001131static void sc_generate_link_key(struct smp_chan *smp)
1132{
1133 /* These constants are as specified in the core specification.
1134 * In ASCII they spell out to 'tmp1' and 'lebr'.
1135 */
1136 const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 };
1137 const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c };
1138
1139 smp->link_key = kzalloc(16, GFP_KERNEL);
1140 if (!smp->link_key)
1141 return;
1142
1143 if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) {
Marcel Holtmann276812e2015-03-16 01:10:18 -07001144 kzfree(smp->link_key);
Johan Hedberg6a770832014-06-06 11:54:04 +03001145 smp->link_key = NULL;
1146 return;
1147 }
1148
1149 if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) {
Marcel Holtmann276812e2015-03-16 01:10:18 -07001150 kzfree(smp->link_key);
Johan Hedberg6a770832014-06-06 11:54:04 +03001151 smp->link_key = NULL;
1152 return;
1153 }
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001154}
1155
Johan Hedbergb28b4942014-09-05 22:19:55 +03001156static void smp_allow_key_dist(struct smp_chan *smp)
1157{
1158 /* Allow the first expected phase 3 PDU. The rest of the PDUs
1159 * will be allowed in each PDU handler to ensure we receive
1160 * them in the correct order.
1161 */
1162 if (smp->remote_key_dist & SMP_DIST_ENC_KEY)
1163 SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO);
1164 else if (smp->remote_key_dist & SMP_DIST_ID_KEY)
1165 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
1166 else if (smp->remote_key_dist & SMP_DIST_SIGN)
1167 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
1168}
1169
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001170static void sc_generate_ltk(struct smp_chan *smp)
1171{
1172 /* These constants are as specified in the core specification.
1173 * In ASCII they spell out to 'tmp2' and 'brle'.
1174 */
1175 const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 };
1176 const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 };
1177 struct hci_conn *hcon = smp->conn->hcon;
1178 struct hci_dev *hdev = hcon->hdev;
1179 struct link_key *key;
1180
1181 key = hci_find_link_key(hdev, &hcon->dst);
1182 if (!key) {
1183 BT_ERR("%s No Link Key found to generate LTK", hdev->name);
1184 return;
1185 }
1186
1187 if (key->type == HCI_LK_DEBUG_COMBINATION)
1188 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1189
1190 if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk))
1191 return;
1192
1193 if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk))
1194 return;
1195
1196 sc_add_ltk(smp);
1197}
1198
Johan Hedbergd6268e82014-09-05 22:19:51 +03001199static void smp_distribute_keys(struct smp_chan *smp)
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001200{
1201 struct smp_cmd_pairing *req, *rsp;
Johan Hedberg86d14072014-08-11 22:06:43 +03001202 struct l2cap_conn *conn = smp->conn;
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001203 struct hci_conn *hcon = conn->hcon;
1204 struct hci_dev *hdev = hcon->hdev;
1205 __u8 *keydist;
1206
1207 BT_DBG("conn %p", conn);
1208
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001209 rsp = (void *) &smp->prsp[1];
1210
1211 /* The responder sends its keys first */
Johan Hedbergb28b4942014-09-05 22:19:55 +03001212 if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) {
1213 smp_allow_key_dist(smp);
Johan Hedberg86d14072014-08-11 22:06:43 +03001214 return;
Johan Hedbergb28b4942014-09-05 22:19:55 +03001215 }
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001216
1217 req = (void *) &smp->preq[1];
1218
1219 if (hcon->out) {
1220 keydist = &rsp->init_key_dist;
1221 *keydist &= req->init_key_dist;
1222 } else {
1223 keydist = &rsp->resp_key_dist;
1224 *keydist &= req->resp_key_dist;
1225 }
1226
Johan Hedberg6a770832014-06-06 11:54:04 +03001227 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001228 if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY))
Johan Hedberg6a770832014-06-06 11:54:04 +03001229 sc_generate_link_key(smp);
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001230 if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY))
1231 sc_generate_ltk(smp);
Johan Hedberg6a770832014-06-06 11:54:04 +03001232
1233 /* Clear the keys which are generated but not distributed */
1234 *keydist &= ~SMP_SC_NO_DIST;
1235 }
1236
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001237 BT_DBG("keydist 0x%x", *keydist);
1238
1239 if (*keydist & SMP_DIST_ENC_KEY) {
1240 struct smp_cmd_encrypt_info enc;
1241 struct smp_cmd_master_ident ident;
1242 struct smp_ltk *ltk;
1243 u8 authenticated;
1244 __le16 ediv;
1245 __le64 rand;
1246
Johan Hedberg1fc62c52015-06-10 11:11:20 +03001247 /* Make sure we generate only the significant amount of
1248 * bytes based on the encryption key size, and set the rest
1249 * of the value to zeroes.
1250 */
1251 get_random_bytes(enc.ltk, smp->enc_key_size);
1252 memset(enc.ltk + smp->enc_key_size, 0,
1253 sizeof(enc.ltk) - smp->enc_key_size);
1254
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001255 get_random_bytes(&ediv, sizeof(ediv));
1256 get_random_bytes(&rand, sizeof(rand));
1257
1258 smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
1259
1260 authenticated = hcon->sec_level == BT_SECURITY_HIGH;
1261 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type,
1262 SMP_LTK_SLAVE, authenticated, enc.ltk,
1263 smp->enc_key_size, ediv, rand);
1264 smp->slave_ltk = ltk;
1265
1266 ident.ediv = ediv;
1267 ident.rand = rand;
1268
1269 smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident);
1270
1271 *keydist &= ~SMP_DIST_ENC_KEY;
1272 }
1273
1274 if (*keydist & SMP_DIST_ID_KEY) {
1275 struct smp_cmd_ident_addr_info addrinfo;
1276 struct smp_cmd_ident_info idinfo;
1277
1278 memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk));
1279
1280 smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
1281
1282 /* The hci_conn contains the local identity address
1283 * after the connection has been established.
1284 *
1285 * This is true even when the connection has been
1286 * established using a resolvable random address.
1287 */
1288 bacpy(&addrinfo.bdaddr, &hcon->src);
1289 addrinfo.addr_type = hcon->src_type;
1290
1291 smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
1292 &addrinfo);
1293
1294 *keydist &= ~SMP_DIST_ID_KEY;
1295 }
1296
1297 if (*keydist & SMP_DIST_SIGN) {
1298 struct smp_cmd_sign_info sign;
1299 struct smp_csrk *csrk;
1300
1301 /* Generate a new random key */
1302 get_random_bytes(sign.csrk, sizeof(sign.csrk));
1303
1304 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
1305 if (csrk) {
Johan Hedberg4cd39282015-02-27 10:11:13 +02001306 if (hcon->sec_level > BT_SECURITY_MEDIUM)
1307 csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED;
1308 else
1309 csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED;
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001310 memcpy(csrk->val, sign.csrk, sizeof(csrk->val));
1311 }
1312 smp->slave_csrk = csrk;
1313
1314 smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
1315
1316 *keydist &= ~SMP_DIST_SIGN;
1317 }
1318
1319 /* If there are still keys to be received wait for them */
Johan Hedbergb28b4942014-09-05 22:19:55 +03001320 if (smp->remote_key_dist & KEY_DIST_MASK) {
1321 smp_allow_key_dist(smp);
Johan Hedberg86d14072014-08-11 22:06:43 +03001322 return;
Johan Hedbergb28b4942014-09-05 22:19:55 +03001323 }
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001324
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001325 set_bit(SMP_FLAG_COMPLETE, &smp->flags);
1326 smp_notify_keys(conn);
1327
1328 smp_chan_destroy(conn);
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03001329}
1330
Johan Hedbergb68fda62014-08-11 22:06:40 +03001331static void smp_timeout(struct work_struct *work)
1332{
1333 struct smp_chan *smp = container_of(work, struct smp_chan,
1334 security_timer.work);
1335 struct l2cap_conn *conn = smp->conn;
1336
1337 BT_DBG("conn %p", conn);
1338
Johan Hedberg1e91c292014-08-18 20:33:29 +03001339 hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM);
Johan Hedbergb68fda62014-08-11 22:06:40 +03001340}
1341
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001342static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
1343{
Johan Hedberg5d88cc72014-08-08 09:37:18 +03001344 struct l2cap_chan *chan = conn->smp;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001345 struct smp_chan *smp;
1346
Marcel Holtmannf1560462013-10-13 05:43:25 -07001347 smp = kzalloc(sizeof(*smp), GFP_ATOMIC);
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001348 if (!smp)
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001349 return NULL;
1350
Andy Lutomirskia4770e12016-06-26 14:55:23 -07001351 smp->tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
Johan Hedberg6a7bd102014-06-27 14:23:03 +03001352 if (IS_ERR(smp->tfm_aes)) {
Andy Lutomirskia4770e12016-06-26 14:55:23 -07001353 BT_ERR("Unable to create AES crypto context");
Marcel Holtmann276812e2015-03-16 01:10:18 -07001354 kzfree(smp);
Johan Hedberg6a7bd102014-06-27 14:23:03 +03001355 return NULL;
1356 }
1357
Herbert Xu71af2f62016-01-24 21:18:30 +08001358 smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
Johan Hedberg407cecf2014-05-02 14:19:47 +03001359 if (IS_ERR(smp->tfm_cmac)) {
1360 BT_ERR("Unable to create CMAC crypto context");
Andy Lutomirskia4770e12016-06-26 14:55:23 -07001361 crypto_free_cipher(smp->tfm_aes);
Marcel Holtmann276812e2015-03-16 01:10:18 -07001362 kzfree(smp);
Johan Hedberg407cecf2014-05-02 14:19:47 +03001363 return NULL;
1364 }
1365
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001366 smp->conn = conn;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03001367 chan->data = smp;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001368
Johan Hedbergb28b4942014-09-05 22:19:55 +03001369 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL);
1370
Johan Hedbergb68fda62014-08-11 22:06:40 +03001371 INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
1372
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001373 hci_conn_hold(conn->hcon);
1374
1375 return smp;
1376}
1377
Johan Hedberg760b0182014-06-06 11:44:05 +03001378static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16])
1379{
1380 struct hci_conn *hcon = smp->conn->hcon;
1381 u8 *na, *nb, a[7], b[7];
1382
1383 if (hcon->out) {
1384 na = smp->prnd;
1385 nb = smp->rrnd;
1386 } else {
1387 na = smp->rrnd;
1388 nb = smp->prnd;
1389 }
1390
1391 memcpy(a, &hcon->init_addr, 6);
1392 memcpy(b, &hcon->resp_addr, 6);
1393 a[6] = hcon->init_addr_type;
1394 b[6] = hcon->resp_addr_type;
1395
1396 return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk);
1397}
1398
Johan Hedberg38606f12014-06-25 11:10:28 +03001399static void sc_dhkey_check(struct smp_chan *smp)
Johan Hedberg760b0182014-06-06 11:44:05 +03001400{
1401 struct hci_conn *hcon = smp->conn->hcon;
1402 struct smp_cmd_dhkey_check check;
1403 u8 a[7], b[7], *local_addr, *remote_addr;
1404 u8 io_cap[3], r[16];
1405
Johan Hedberg760b0182014-06-06 11:44:05 +03001406 memcpy(a, &hcon->init_addr, 6);
1407 memcpy(b, &hcon->resp_addr, 6);
1408 a[6] = hcon->init_addr_type;
1409 b[6] = hcon->resp_addr_type;
1410
1411 if (hcon->out) {
1412 local_addr = a;
1413 remote_addr = b;
1414 memcpy(io_cap, &smp->preq[1], 3);
1415 } else {
1416 local_addr = b;
1417 remote_addr = a;
1418 memcpy(io_cap, &smp->prsp[1], 3);
1419 }
1420
Johan Hedbergdddd3052014-06-01 15:38:09 +03001421 memset(r, 0, sizeof(r));
1422
1423 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
Johan Hedberg38606f12014-06-25 11:10:28 +03001424 put_unaligned_le32(hcon->passkey_notify, r);
Johan Hedberg760b0182014-06-06 11:44:05 +03001425
Johan Hedberga29b0732014-10-28 15:17:05 +01001426 if (smp->method == REQ_OOB)
1427 memcpy(r, smp->rr, 16);
1428
Johan Hedberg760b0182014-06-06 11:44:05 +03001429 smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
1430 local_addr, remote_addr, check.e);
1431
1432 smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check);
Johan Hedbergdddd3052014-06-01 15:38:09 +03001433}
1434
Johan Hedberg38606f12014-06-25 11:10:28 +03001435static u8 sc_passkey_send_confirm(struct smp_chan *smp)
1436{
1437 struct l2cap_conn *conn = smp->conn;
1438 struct hci_conn *hcon = conn->hcon;
1439 struct smp_cmd_pairing_confirm cfm;
1440 u8 r;
1441
1442 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1443 r |= 0x80;
1444
1445 get_random_bytes(smp->prnd, sizeof(smp->prnd));
1446
1447 if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r,
1448 cfm.confirm_val))
1449 return SMP_UNSPECIFIED;
1450
1451 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
1452
1453 return 0;
1454}
1455
1456static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op)
1457{
1458 struct l2cap_conn *conn = smp->conn;
1459 struct hci_conn *hcon = conn->hcon;
1460 struct hci_dev *hdev = hcon->hdev;
1461 u8 cfm[16], r;
1462
1463 /* Ignore the PDU if we've already done 20 rounds (0 - 19) */
1464 if (smp->passkey_round >= 20)
1465 return 0;
1466
1467 switch (smp_op) {
1468 case SMP_CMD_PAIRING_RANDOM:
1469 r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
1470 r |= 0x80;
1471
1472 if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
1473 smp->rrnd, r, cfm))
1474 return SMP_UNSPECIFIED;
1475
1476 if (memcmp(smp->pcnf, cfm, 16))
1477 return SMP_CONFIRM_FAILED;
1478
1479 smp->passkey_round++;
1480
1481 if (smp->passkey_round == 20) {
1482 /* Generate MacKey and LTK */
1483 if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk))
1484 return SMP_UNSPECIFIED;
1485 }
1486
1487 /* The round is only complete when the initiator
1488 * receives pairing random.
1489 */
1490 if (!hcon->out) {
1491 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1492 sizeof(smp->prnd), smp->prnd);
Johan Hedbergd3e54a82014-06-04 11:07:40 +03001493 if (smp->passkey_round == 20)
Johan Hedberg38606f12014-06-25 11:10:28 +03001494 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
Johan Hedbergd3e54a82014-06-04 11:07:40 +03001495 else
Johan Hedberg38606f12014-06-25 11:10:28 +03001496 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
Johan Hedberg38606f12014-06-25 11:10:28 +03001497 return 0;
1498 }
1499
1500 /* Start the next round */
1501 if (smp->passkey_round != 20)
1502 return sc_passkey_round(smp, 0);
1503
1504 /* Passkey rounds are complete - start DHKey Check */
1505 sc_dhkey_check(smp);
1506 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1507
1508 break;
1509
1510 case SMP_CMD_PAIRING_CONFIRM:
1511 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
1512 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
1513 return 0;
1514 }
1515
1516 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1517
1518 if (hcon->out) {
1519 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
1520 sizeof(smp->prnd), smp->prnd);
1521 return 0;
1522 }
1523
1524 return sc_passkey_send_confirm(smp);
1525
1526 case SMP_CMD_PUBLIC_KEY:
1527 default:
1528 /* Initiating device starts the round */
1529 if (!hcon->out)
1530 return 0;
1531
1532 BT_DBG("%s Starting passkey round %u", hdev->name,
1533 smp->passkey_round + 1);
1534
1535 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1536
1537 return sc_passkey_send_confirm(smp);
1538 }
1539
1540 return 0;
1541}
1542
Johan Hedbergdddd3052014-06-01 15:38:09 +03001543static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey)
1544{
Johan Hedberg38606f12014-06-25 11:10:28 +03001545 struct l2cap_conn *conn = smp->conn;
1546 struct hci_conn *hcon = conn->hcon;
1547 u8 smp_op;
1548
1549 clear_bit(SMP_FLAG_WAIT_USER, &smp->flags);
1550
Johan Hedbergdddd3052014-06-01 15:38:09 +03001551 switch (mgmt_op) {
1552 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1553 smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED);
1554 return 0;
1555 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
1556 smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED);
1557 return 0;
Johan Hedberg38606f12014-06-25 11:10:28 +03001558 case MGMT_OP_USER_PASSKEY_REPLY:
1559 hcon->passkey_notify = le32_to_cpu(passkey);
1560 smp->passkey_round = 0;
1561
1562 if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags))
1563 smp_op = SMP_CMD_PAIRING_CONFIRM;
1564 else
1565 smp_op = 0;
1566
1567 if (sc_passkey_round(smp, smp_op))
1568 return -EIO;
1569
1570 return 0;
Johan Hedbergdddd3052014-06-01 15:38:09 +03001571 }
1572
Johan Hedbergd3e54a82014-06-04 11:07:40 +03001573 /* Initiator sends DHKey check first */
1574 if (hcon->out) {
1575 sc_dhkey_check(smp);
1576 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
1577 } else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) {
1578 sc_dhkey_check(smp);
1579 sc_add_ltk(smp);
1580 }
Johan Hedberg760b0182014-06-06 11:44:05 +03001581
1582 return 0;
1583}
1584
Brian Gix2b64d152011-12-21 16:12:12 -08001585int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
1586{
Johan Hedbergb10e8012014-06-27 14:23:07 +03001587 struct l2cap_conn *conn = hcon->l2cap_data;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03001588 struct l2cap_chan *chan;
Brian Gix2b64d152011-12-21 16:12:12 -08001589 struct smp_chan *smp;
1590 u32 value;
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001591 int err;
Brian Gix2b64d152011-12-21 16:12:12 -08001592
1593 BT_DBG("");
1594
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001595 if (!conn)
Brian Gix2b64d152011-12-21 16:12:12 -08001596 return -ENOTCONN;
1597
Johan Hedberg5d88cc72014-08-08 09:37:18 +03001598 chan = conn->smp;
1599 if (!chan)
1600 return -ENOTCONN;
1601
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001602 l2cap_chan_lock(chan);
1603 if (!chan->data) {
1604 err = -ENOTCONN;
1605 goto unlock;
1606 }
1607
Johan Hedberg5d88cc72014-08-08 09:37:18 +03001608 smp = chan->data;
Brian Gix2b64d152011-12-21 16:12:12 -08001609
Johan Hedberg760b0182014-06-06 11:44:05 +03001610 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1611 err = sc_user_reply(smp, mgmt_op, passkey);
1612 goto unlock;
1613 }
1614
Brian Gix2b64d152011-12-21 16:12:12 -08001615 switch (mgmt_op) {
1616 case MGMT_OP_USER_PASSKEY_REPLY:
1617 value = le32_to_cpu(passkey);
Johan Hedberg943a7322014-03-18 12:58:24 +02001618 memset(smp->tk, 0, sizeof(smp->tk));
Brian Gix2b64d152011-12-21 16:12:12 -08001619 BT_DBG("PassKey: %d", value);
Johan Hedberg943a7322014-03-18 12:58:24 +02001620 put_unaligned_le32(value, smp->tk);
Brian Gix2b64d152011-12-21 16:12:12 -08001621 /* Fall Through */
1622 case MGMT_OP_USER_CONFIRM_REPLY:
Johan Hedberg4a74d652014-05-20 09:45:50 +03001623 set_bit(SMP_FLAG_TK_VALID, &smp->flags);
Brian Gix2b64d152011-12-21 16:12:12 -08001624 break;
1625 case MGMT_OP_USER_PASSKEY_NEG_REPLY:
1626 case MGMT_OP_USER_CONFIRM_NEG_REPLY:
Johan Hedberg84794e12013-11-06 11:24:57 +02001627 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001628 err = 0;
1629 goto unlock;
Brian Gix2b64d152011-12-21 16:12:12 -08001630 default:
Johan Hedberg84794e12013-11-06 11:24:57 +02001631 smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001632 err = -EOPNOTSUPP;
1633 goto unlock;
Brian Gix2b64d152011-12-21 16:12:12 -08001634 }
1635
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001636 err = 0;
1637
Brian Gix2b64d152011-12-21 16:12:12 -08001638 /* If it is our turn to send Pairing Confirm, do so now */
Johan Hedberg1cc61142014-05-20 09:45:52 +03001639 if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
1640 u8 rsp = smp_confirm(smp);
1641 if (rsp)
1642 smp_failure(conn, rsp);
1643 }
Brian Gix2b64d152011-12-21 16:12:12 -08001644
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001645unlock:
1646 l2cap_chan_unlock(chan);
1647 return err;
Brian Gix2b64d152011-12-21 16:12:12 -08001648}
1649
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001650static void build_bredr_pairing_cmd(struct smp_chan *smp,
1651 struct smp_cmd_pairing *req,
1652 struct smp_cmd_pairing *rsp)
1653{
1654 struct l2cap_conn *conn = smp->conn;
1655 struct hci_dev *hdev = conn->hcon->hdev;
1656 u8 local_dist = 0, remote_dist = 0;
1657
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001658 if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001659 local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1660 remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
1661 }
1662
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001663 if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001664 remote_dist |= SMP_DIST_ID_KEY;
1665
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001666 if (hci_dev_test_flag(hdev, HCI_PRIVACY))
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001667 local_dist |= SMP_DIST_ID_KEY;
1668
1669 if (!rsp) {
1670 memset(req, 0, sizeof(*req));
1671
1672 req->init_key_dist = local_dist;
1673 req->resp_key_dist = remote_dist;
Johan Hedberge3f6a252015-06-11 13:52:30 +03001674 req->max_key_size = conn->hcon->enc_key_size;
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001675
1676 smp->remote_key_dist = remote_dist;
1677
1678 return;
1679 }
1680
1681 memset(rsp, 0, sizeof(*rsp));
1682
Johan Hedberge3f6a252015-06-11 13:52:30 +03001683 rsp->max_key_size = conn->hcon->enc_key_size;
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001684 rsp->init_key_dist = req->init_key_dist & remote_dist;
1685 rsp->resp_key_dist = req->resp_key_dist & local_dist;
1686
1687 smp->remote_key_dist = rsp->init_key_dist;
1688}
1689
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03001690static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001691{
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -03001692 struct smp_cmd_pairing rsp, *req = (void *) skb->data;
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001693 struct l2cap_chan *chan = conn->smp;
Johan Hedbergb3c64102014-07-10 11:02:07 +03001694 struct hci_dev *hdev = conn->hcon->hdev;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001695 struct smp_chan *smp;
Johan Hedbergc7262e72014-06-17 13:07:37 +03001696 u8 key_size, auth, sec_level;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001697 int ret;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001698
1699 BT_DBG("conn %p", conn);
1700
Johan Hedbergc46b98b2014-02-18 10:19:29 +02001701 if (skb->len < sizeof(*req))
Johan Hedberg38e4a912014-05-08 14:19:11 +03001702 return SMP_INVALID_PARAMS;
Johan Hedbergc46b98b2014-02-18 10:19:29 +02001703
Johan Hedberg40bef302014-07-16 11:42:27 +03001704 if (conn->hcon->role != HCI_ROLE_SLAVE)
Brian Gix2b64d152011-12-21 16:12:12 -08001705 return SMP_CMD_NOTSUPP;
1706
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001707 if (!chan->data)
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001708 smp = smp_chan_create(conn);
Johan Hedbergfc75cc82014-09-05 22:19:52 +03001709 else
Johan Hedberg5d88cc72014-08-08 09:37:18 +03001710 smp = chan->data;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001711
Andrei Emeltchenkod08fd0e2012-07-19 17:03:43 +03001712 if (!smp)
1713 return SMP_UNSPECIFIED;
Vinicius Costa Gomesd26a2342011-08-19 21:06:51 -03001714
Johan Hedbergc05b9332014-09-10 17:37:42 -07001715 /* We didn't start the pairing, so match remote */
Johan Hedberg0edb14d2014-05-26 13:29:28 +03001716 auth = req->auth_req & AUTH_REQ_MASK(hdev);
Johan Hedbergc05b9332014-09-10 17:37:42 -07001717
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001718 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
Johan Hedbergc05b9332014-09-10 17:37:42 -07001719 (auth & SMP_AUTH_BONDING))
Johan Hedbergb3c64102014-07-10 11:02:07 +03001720 return SMP_PAIRING_NOTSUPP;
1721
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001722 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
Johan Hedberg903b71c2014-09-08 16:59:18 -07001723 return SMP_AUTH_REQUIREMENTS;
1724
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -03001725 smp->preq[0] = SMP_CMD_PAIRING_REQ;
1726 memcpy(&smp->preq[1], req, sizeof(*req));
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -03001727 skb_pull(skb, sizeof(*req));
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001728
Johan Hedbergcb06d362015-03-16 21:12:34 +02001729 /* If the remote side's OOB flag is set it means it has
1730 * successfully received our local OOB data - therefore set the
1731 * flag to indicate that local OOB is in use.
1732 */
Johan Hedberg58428562015-03-16 11:45:45 +02001733 if (req->oob_flag == SMP_OOB_PRESENT)
1734 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1735
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001736 /* SMP over BR/EDR requires special treatment */
1737 if (conn->hcon->type == ACL_LINK) {
1738 /* We must have a BR/EDR SC link */
Marcel Holtmann08f63cc2014-12-07 16:19:12 +01001739 if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) &&
Marcel Holtmannb7cb93e2015-03-13 10:20:35 -07001740 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001741 return SMP_CROSS_TRANSP_NOT_ALLOWED;
1742
1743 set_bit(SMP_FLAG_SC, &smp->flags);
1744
1745 build_bredr_pairing_cmd(smp, req, &rsp);
1746
1747 key_size = min(req->max_key_size, rsp.max_key_size);
1748 if (check_enc_key_size(conn, key_size))
1749 return SMP_ENC_KEY_SIZE;
1750
1751 /* Clear bits which are generated but not distributed */
1752 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1753
1754 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1755 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
1756 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
1757
1758 smp_distribute_keys(smp);
1759 return 0;
1760 }
1761
Johan Hedberg5e3d3d92014-05-31 18:51:02 +03001762 build_pairing_cmd(conn, req, &rsp, auth);
1763
1764 if (rsp.auth_req & SMP_AUTH_SC)
1765 set_bit(SMP_FLAG_SC, &smp->flags);
1766
Johan Hedberg5be5e272014-09-10 17:58:54 -07001767 if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
Johan Hedberg1afc2a12014-09-10 17:37:44 -07001768 sec_level = BT_SECURITY_MEDIUM;
1769 else
1770 sec_level = authreq_to_seclevel(auth);
1771
Johan Hedbergc7262e72014-06-17 13:07:37 +03001772 if (sec_level > conn->hcon->pending_sec_level)
1773 conn->hcon->pending_sec_level = sec_level;
Ido Yarivfdde0a22012-03-05 20:09:38 +02001774
Stephen Hemminger49c922b2014-10-27 21:12:20 -07001775 /* If we need MITM check that it can be achieved */
Johan Hedberg2ed8f652014-06-17 13:07:39 +03001776 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1777 u8 method;
1778
1779 method = get_auth_method(smp, conn->hcon->io_capability,
1780 req->io_capability);
1781 if (method == JUST_WORKS || method == JUST_CFM)
1782 return SMP_AUTH_REQUIREMENTS;
1783 }
1784
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -03001785 key_size = min(req->max_key_size, rsp.max_key_size);
1786 if (check_enc_key_size(conn, key_size))
1787 return SMP_ENC_KEY_SIZE;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001788
Johan Hedberge84a6b12013-12-02 10:49:03 +02001789 get_random_bytes(smp->prnd, sizeof(smp->prnd));
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03001790
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -03001791 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1792 memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
Anderson Brigliaf01ead32011-06-09 18:50:45 -03001793
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -03001794 smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
Johan Hedberg3b191462014-06-06 10:50:15 +03001795
1796 clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
1797
Johan Hedberg19c5ce92015-03-15 19:34:04 +02001798 /* Strictly speaking we shouldn't allow Pairing Confirm for the
1799 * SC case, however some implementations incorrectly copy RFU auth
1800 * req bits from our security request, which may create a false
1801 * positive SC enablement.
1802 */
1803 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
1804
Johan Hedberg3b191462014-06-06 10:50:15 +03001805 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1806 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1807 /* Clear bits which are generated but not distributed */
1808 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1809 /* Wait for Public Key from Initiating Device */
1810 return 0;
Johan Hedberg3b191462014-06-06 10:50:15 +03001811 }
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03001812
Brian Gix2b64d152011-12-21 16:12:12 -08001813 /* Request setup of TK */
1814 ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
1815 if (ret)
1816 return SMP_UNSPECIFIED;
1817
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03001818 return 0;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001819}
1820
Johan Hedberg3b191462014-06-06 10:50:15 +03001821static u8 sc_send_public_key(struct smp_chan *smp)
1822{
Johan Hedberg70157ef2014-06-24 15:22:59 +03001823 struct hci_dev *hdev = smp->conn->hcon->hdev;
1824
Johan Hedberg3b191462014-06-06 10:50:15 +03001825 BT_DBG("");
1826
Johan Hedberg1a8bab42015-03-16 11:45:44 +02001827 if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
Marcel Holtmann33d0c032015-03-16 01:10:24 -07001828 struct l2cap_chan *chan = hdev->smp_data;
1829 struct smp_dev *smp_dev;
1830
1831 if (!chan || !chan->data)
1832 return SMP_UNSPECIFIED;
1833
1834 smp_dev = chan->data;
1835
1836 memcpy(smp->local_pk, smp_dev->local_pk, 64);
1837 memcpy(smp->local_sk, smp_dev->local_sk, 32);
Marcel Holtmannfb334fe2015-03-16 12:34:57 -07001838 memcpy(smp->lr, smp_dev->local_rand, 16);
Marcel Holtmann33d0c032015-03-16 01:10:24 -07001839
1840 if (smp_dev->debug_key)
1841 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1842
1843 goto done;
1844 }
1845
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001846 if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
Johan Hedberg70157ef2014-06-24 15:22:59 +03001847 BT_DBG("Using debug keys");
1848 memcpy(smp->local_pk, debug_pk, 64);
1849 memcpy(smp->local_sk, debug_sk, 32);
1850 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
1851 } else {
1852 while (true) {
1853 /* Generate local key pair for Secure Connections */
1854 if (!ecc_make_key(smp->local_pk, smp->local_sk))
1855 return SMP_UNSPECIFIED;
Johan Hedberg6c0dcc52014-06-06 15:33:30 +03001856
Johan Hedberg70157ef2014-06-24 15:22:59 +03001857 /* This is unlikely, but we need to check that
1858 * we didn't accidentially generate a debug key.
1859 */
1860 if (memcmp(smp->local_sk, debug_sk, 32))
1861 break;
1862 }
Johan Hedberg6c0dcc52014-06-06 15:33:30 +03001863 }
Johan Hedberg3b191462014-06-06 10:50:15 +03001864
Marcel Holtmann33d0c032015-03-16 01:10:24 -07001865done:
Johan Hedbergc7a3d572014-12-01 22:03:16 +02001866 SMP_DBG("Local Public Key X: %32phN", smp->local_pk);
Marcel Holtmann8e4e2ee2015-03-16 01:10:25 -07001867 SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32);
Johan Hedbergc7a3d572014-12-01 22:03:16 +02001868 SMP_DBG("Local Private Key: %32phN", smp->local_sk);
Johan Hedberg3b191462014-06-06 10:50:15 +03001869
1870 smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk);
1871
1872 return 0;
1873}
1874
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03001875static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001876{
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -03001877 struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03001878 struct l2cap_chan *chan = conn->smp;
1879 struct smp_chan *smp = chan->data;
Johan Hedberg0edb14d2014-05-26 13:29:28 +03001880 struct hci_dev *hdev = conn->hcon->hdev;
Johan Hedberg3a7dbfb2014-09-10 17:37:41 -07001881 u8 key_size, auth;
Anderson Briglia7d24ddc2011-06-09 18:50:46 -03001882 int ret;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001883
1884 BT_DBG("conn %p", conn);
1885
Johan Hedbergc46b98b2014-02-18 10:19:29 +02001886 if (skb->len < sizeof(*rsp))
Johan Hedberg38e4a912014-05-08 14:19:11 +03001887 return SMP_INVALID_PARAMS;
Johan Hedbergc46b98b2014-02-18 10:19:29 +02001888
Johan Hedberg40bef302014-07-16 11:42:27 +03001889 if (conn->hcon->role != HCI_ROLE_MASTER)
Brian Gix2b64d152011-12-21 16:12:12 -08001890 return SMP_CMD_NOTSUPP;
1891
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -03001892 skb_pull(skb, sizeof(*rsp));
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03001893
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -03001894 req = (void *) &smp->preq[1];
Vinicius Costa Gomes3158c502011-06-14 13:37:42 -03001895
1896 key_size = min(req->max_key_size, rsp->max_key_size);
1897 if (check_enc_key_size(conn, key_size))
1898 return SMP_ENC_KEY_SIZE;
1899
Johan Hedberg0edb14d2014-05-26 13:29:28 +03001900 auth = rsp->auth_req & AUTH_REQ_MASK(hdev);
Johan Hedbergc05b9332014-09-10 17:37:42 -07001901
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07001902 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
Johan Hedberg903b71c2014-09-08 16:59:18 -07001903 return SMP_AUTH_REQUIREMENTS;
1904
Johan Hedbergcb06d362015-03-16 21:12:34 +02001905 /* If the remote side's OOB flag is set it means it has
1906 * successfully received our local OOB data - therefore set the
1907 * flag to indicate that local OOB is in use.
1908 */
Johan Hedberg58428562015-03-16 11:45:45 +02001909 if (rsp->oob_flag == SMP_OOB_PRESENT)
1910 set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
1911
Johan Hedbergb5ae3442014-08-14 12:34:26 +03001912 smp->prsp[0] = SMP_CMD_PAIRING_RSP;
1913 memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
1914
1915 /* Update remote key distribution in case the remote cleared
1916 * some bits that we had enabled in our request.
1917 */
1918 smp->remote_key_dist &= rsp->resp_key_dist;
1919
1920 /* For BR/EDR this means we're done and can start phase 3 */
1921 if (conn->hcon->type == ACL_LINK) {
1922 /* Clear bits which are generated but not distributed */
1923 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1924 smp_distribute_keys(smp);
1925 return 0;
1926 }
1927
Johan Hedberg65668772014-05-16 11:03:34 +03001928 if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC))
1929 set_bit(SMP_FLAG_SC, &smp->flags);
Johan Hedbergd2eb9e12014-05-16 10:59:06 +03001930 else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH)
1931 conn->hcon->pending_sec_level = BT_SECURITY_HIGH;
Johan Hedberg65668772014-05-16 11:03:34 +03001932
Stephen Hemminger49c922b2014-10-27 21:12:20 -07001933 /* If we need MITM check that it can be achieved */
Johan Hedberg2ed8f652014-06-17 13:07:39 +03001934 if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
1935 u8 method;
1936
1937 method = get_auth_method(smp, req->io_capability,
1938 rsp->io_capability);
1939 if (method == JUST_WORKS || method == JUST_CFM)
1940 return SMP_AUTH_REQUIREMENTS;
1941 }
1942
Johan Hedberge84a6b12013-12-02 10:49:03 +02001943 get_random_bytes(smp->prnd, sizeof(smp->prnd));
Anderson Briglia7d24ddc2011-06-09 18:50:46 -03001944
Johan Hedbergfdcc4be2014-03-14 10:53:50 +02001945 /* Update remote key distribution in case the remote cleared
1946 * some bits that we had enabled in our request.
1947 */
1948 smp->remote_key_dist &= rsp->resp_key_dist;
1949
Johan Hedberg3b191462014-06-06 10:50:15 +03001950 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
1951 /* Clear bits which are generated but not distributed */
1952 smp->remote_key_dist &= ~SMP_SC_NO_DIST;
1953 SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
1954 return sc_send_public_key(smp);
1955 }
1956
Johan Hedbergc05b9332014-09-10 17:37:42 -07001957 auth |= req->auth_req;
Brian Gix2b64d152011-12-21 16:12:12 -08001958
Johan Hedberg476585e2012-06-06 18:54:15 +08001959 ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
Brian Gix2b64d152011-12-21 16:12:12 -08001960 if (ret)
1961 return SMP_UNSPECIFIED;
1962
Johan Hedberg4a74d652014-05-20 09:45:50 +03001963 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
Brian Gix2b64d152011-12-21 16:12:12 -08001964
1965 /* Can't compose response until we have been confirmed */
Johan Hedberg4a74d652014-05-20 09:45:50 +03001966 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
Johan Hedberg1cc61142014-05-20 09:45:52 +03001967 return smp_confirm(smp);
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03001968
1969 return 0;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03001970}
1971
Johan Hedbergdcee2b32014-06-06 11:36:38 +03001972static u8 sc_check_confirm(struct smp_chan *smp)
1973{
1974 struct l2cap_conn *conn = smp->conn;
1975
1976 BT_DBG("");
1977
Johan Hedberg38606f12014-06-25 11:10:28 +03001978 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
1979 return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM);
1980
Johan Hedbergdcee2b32014-06-06 11:36:38 +03001981 if (conn->hcon->out) {
1982 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
1983 smp->prnd);
1984 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
1985 }
1986
1987 return 0;
1988}
1989
Johan Hedberg19c5ce92015-03-15 19:34:04 +02001990/* Work-around for some implementations that incorrectly copy RFU bits
1991 * from our security request and thereby create the impression that
1992 * we're doing SC when in fact the remote doesn't support it.
1993 */
1994static int fixup_sc_false_positive(struct smp_chan *smp)
1995{
1996 struct l2cap_conn *conn = smp->conn;
1997 struct hci_conn *hcon = conn->hcon;
1998 struct hci_dev *hdev = hcon->hdev;
1999 struct smp_cmd_pairing *req, *rsp;
2000 u8 auth;
2001
2002 /* The issue is only observed when we're in slave role */
2003 if (hcon->out)
2004 return SMP_UNSPECIFIED;
2005
2006 if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) {
2007 BT_ERR("Refusing SMP SC -> legacy fallback in SC-only mode");
2008 return SMP_UNSPECIFIED;
2009 }
2010
2011 BT_ERR("Trying to fall back to legacy SMP");
2012
2013 req = (void *) &smp->preq[1];
2014 rsp = (void *) &smp->prsp[1];
2015
2016 /* Rebuild key dist flags which may have been cleared for SC */
2017 smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist);
2018
2019 auth = req->auth_req & AUTH_REQ_MASK(hdev);
2020
2021 if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) {
2022 BT_ERR("Failed to fall back to legacy SMP");
2023 return SMP_UNSPECIFIED;
2024 }
2025
2026 clear_bit(SMP_FLAG_SC, &smp->flags);
2027
2028 return 0;
2029}
2030
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002031static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002032{
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002033 struct l2cap_chan *chan = conn->smp;
2034 struct smp_chan *smp = chan->data;
Anderson Briglia7d24ddc2011-06-09 18:50:46 -03002035
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002036 BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
2037
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002038 if (skb->len < sizeof(smp->pcnf))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002039 return SMP_INVALID_PARAMS;
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002040
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -03002041 memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
2042 skb_pull(skb, sizeof(smp->pcnf));
Anderson Briglia7d24ddc2011-06-09 18:50:46 -03002043
Johan Hedberg19c5ce92015-03-15 19:34:04 +02002044 if (test_bit(SMP_FLAG_SC, &smp->flags)) {
2045 int ret;
2046
2047 /* Public Key exchange must happen before any other steps */
2048 if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags))
2049 return sc_check_confirm(smp);
2050
2051 BT_ERR("Unexpected SMP Pairing Confirm");
2052
2053 ret = fixup_sc_false_positive(smp);
2054 if (ret)
2055 return ret;
2056 }
Johan Hedbergdcee2b32014-06-06 11:36:38 +03002057
Johan Hedbergb28b4942014-09-05 22:19:55 +03002058 if (conn->hcon->out) {
Johan Hedberg943a7322014-03-18 12:58:24 +02002059 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2060 smp->prnd);
Johan Hedbergb28b4942014-09-05 22:19:55 +03002061 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2062 return 0;
2063 }
2064
2065 if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
Johan Hedberg1cc61142014-05-20 09:45:52 +03002066 return smp_confirm(smp);
Marcel Holtmann983f9812015-03-11 17:47:40 -07002067
2068 set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002069
2070 return 0;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002071}
2072
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002073static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002074{
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002075 struct l2cap_chan *chan = conn->smp;
2076 struct smp_chan *smp = chan->data;
Johan Hedberg191dc7f2014-06-06 11:39:49 +03002077 struct hci_conn *hcon = conn->hcon;
2078 u8 *pkax, *pkbx, *na, *nb;
2079 u32 passkey;
2080 int err;
Anderson Briglia7d24ddc2011-06-09 18:50:46 -03002081
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03002082 BT_DBG("conn %p", conn);
Anderson Briglia7d24ddc2011-06-09 18:50:46 -03002083
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002084 if (skb->len < sizeof(smp->rrnd))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002085 return SMP_INVALID_PARAMS;
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002086
Johan Hedberg943a7322014-03-18 12:58:24 +02002087 memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03002088 skb_pull(skb, sizeof(smp->rrnd));
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002089
Johan Hedberg191dc7f2014-06-06 11:39:49 +03002090 if (!test_bit(SMP_FLAG_SC, &smp->flags))
2091 return smp_random(smp);
2092
Johan Hedberg580039e2014-12-03 16:26:37 +02002093 if (hcon->out) {
2094 pkax = smp->local_pk;
2095 pkbx = smp->remote_pk;
2096 na = smp->prnd;
2097 nb = smp->rrnd;
2098 } else {
2099 pkax = smp->remote_pk;
2100 pkbx = smp->local_pk;
2101 na = smp->rrnd;
2102 nb = smp->prnd;
2103 }
2104
Johan Hedberga29b0732014-10-28 15:17:05 +01002105 if (smp->method == REQ_OOB) {
2106 if (!hcon->out)
2107 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2108 sizeof(smp->prnd), smp->prnd);
2109 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2110 goto mackey_and_ltk;
2111 }
2112
Johan Hedberg38606f12014-06-25 11:10:28 +03002113 /* Passkey entry has special treatment */
2114 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2115 return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
2116
Johan Hedberg191dc7f2014-06-06 11:39:49 +03002117 if (hcon->out) {
2118 u8 cfm[16];
2119
2120 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
2121 smp->rrnd, 0, cfm);
2122 if (err)
2123 return SMP_UNSPECIFIED;
2124
2125 if (memcmp(smp->pcnf, cfm, 16))
2126 return SMP_CONFIRM_FAILED;
Johan Hedberg191dc7f2014-06-06 11:39:49 +03002127 } else {
2128 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
2129 smp->prnd);
2130 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
Johan Hedberg191dc7f2014-06-06 11:39:49 +03002131 }
2132
Johan Hedberga29b0732014-10-28 15:17:05 +01002133mackey_and_ltk:
Johan Hedberg760b0182014-06-06 11:44:05 +03002134 /* Generate MacKey and LTK */
2135 err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
2136 if (err)
2137 return SMP_UNSPECIFIED;
2138
Johan Hedberga29b0732014-10-28 15:17:05 +01002139 if (smp->method == JUST_WORKS || smp->method == REQ_OOB) {
Johan Hedbergdddd3052014-06-01 15:38:09 +03002140 if (hcon->out) {
Johan Hedberg38606f12014-06-25 11:10:28 +03002141 sc_dhkey_check(smp);
Johan Hedbergdddd3052014-06-01 15:38:09 +03002142 SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
2143 }
2144 return 0;
2145 }
2146
Johan Hedberg38606f12014-06-25 11:10:28 +03002147 err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
Johan Hedberg191dc7f2014-06-06 11:39:49 +03002148 if (err)
2149 return SMP_UNSPECIFIED;
2150
Johan Hedberg38606f12014-06-25 11:10:28 +03002151 err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type,
2152 hcon->dst_type, passkey, 0);
2153 if (err)
2154 return SMP_UNSPECIFIED;
2155
2156 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2157
Johan Hedberg191dc7f2014-06-06 11:39:49 +03002158 return 0;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002159}
2160
Marcel Holtmannf81cd822014-07-01 10:59:24 +02002161static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002162{
Vinicius Costa Gomesc9839a12012-02-02 21:08:01 -03002163 struct smp_ltk *key;
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002164 struct hci_conn *hcon = conn->hcon;
2165
Johan Hedbergf3a73d92014-05-29 15:02:59 +03002166 key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role);
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002167 if (!key)
Marcel Holtmannf81cd822014-07-01 10:59:24 +02002168 return false;
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002169
Johan Hedberga6f78332014-09-10 17:37:45 -07002170 if (smp_ltk_sec_level(key) < sec_level)
Marcel Holtmannf81cd822014-07-01 10:59:24 +02002171 return false;
Johan Hedberg4dab7862012-06-07 14:58:37 +08002172
Johan Hedberg51a8efd2012-01-16 06:10:31 +02002173 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
Marcel Holtmannf81cd822014-07-01 10:59:24 +02002174 return true;
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002175
Johan Hedberg8b76ce32015-06-08 18:14:39 +03002176 hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size);
Vinicius Costa Gomesc9839a12012-02-02 21:08:01 -03002177 hcon->enc_key_size = key->enc_size;
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002178
Johan Hedbergfe59a052014-07-01 19:14:12 +03002179 /* We never store STKs for master role, so clear this flag */
2180 clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
2181
Marcel Holtmannf81cd822014-07-01 10:59:24 +02002182 return true;
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002183}
Marcel Holtmannf1560462013-10-13 05:43:25 -07002184
Johan Hedberg35dc6f82014-11-13 10:55:18 +02002185bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
2186 enum smp_key_pref key_pref)
Johan Hedberg854f4722014-07-01 18:40:20 +03002187{
2188 if (sec_level == BT_SECURITY_LOW)
2189 return true;
2190
Johan Hedberg35dc6f82014-11-13 10:55:18 +02002191 /* If we're encrypted with an STK but the caller prefers using
2192 * LTK claim insufficient security. This way we allow the
2193 * connection to be re-encrypted with an LTK, even if the LTK
2194 * provides the same level of security. Only exception is if we
2195 * don't have an LTK (e.g. because of key distribution bits).
Johan Hedberg9ab65d602014-07-01 19:14:13 +03002196 */
Johan Hedberg35dc6f82014-11-13 10:55:18 +02002197 if (key_pref == SMP_USE_LTK &&
2198 test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
Johan Hedbergf3a73d92014-05-29 15:02:59 +03002199 hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role))
Johan Hedberg9ab65d602014-07-01 19:14:13 +03002200 return false;
2201
Johan Hedberg854f4722014-07-01 18:40:20 +03002202 if (hcon->sec_level >= sec_level)
2203 return true;
2204
2205 return false;
2206}
2207
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002208static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002209{
2210 struct smp_cmd_security_req *rp = (void *) skb->data;
2211 struct smp_cmd_pairing cp;
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -03002212 struct hci_conn *hcon = conn->hcon;
Johan Hedberg0edb14d2014-05-26 13:29:28 +03002213 struct hci_dev *hdev = hcon->hdev;
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03002214 struct smp_chan *smp;
Johan Hedbergc05b9332014-09-10 17:37:42 -07002215 u8 sec_level, auth;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002216
2217 BT_DBG("conn %p", conn);
2218
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002219 if (skb->len < sizeof(*rp))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002220 return SMP_INVALID_PARAMS;
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002221
Johan Hedberg40bef302014-07-16 11:42:27 +03002222 if (hcon->role != HCI_ROLE_MASTER)
Johan Hedberg86ca9ea2013-11-05 11:30:39 +02002223 return SMP_CMD_NOTSUPP;
2224
Johan Hedberg0edb14d2014-05-26 13:29:28 +03002225 auth = rp->auth_req & AUTH_REQ_MASK(hdev);
Johan Hedbergc05b9332014-09-10 17:37:42 -07002226
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07002227 if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
Johan Hedberg903b71c2014-09-08 16:59:18 -07002228 return SMP_AUTH_REQUIREMENTS;
2229
Johan Hedberg5be5e272014-09-10 17:58:54 -07002230 if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
Johan Hedberg1afc2a12014-09-10 17:37:44 -07002231 sec_level = BT_SECURITY_MEDIUM;
2232 else
2233 sec_level = authreq_to_seclevel(auth);
2234
Johan Hedberg35dc6f82014-11-13 10:55:18 +02002235 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
Johan Hedberg854f4722014-07-01 18:40:20 +03002236 return 0;
2237
Johan Hedbergc7262e72014-06-17 13:07:37 +03002238 if (sec_level > hcon->pending_sec_level)
2239 hcon->pending_sec_level = sec_level;
Vinicius Costa Gomesfeb45eb2011-08-25 20:02:35 -03002240
Johan Hedberg4dab7862012-06-07 14:58:37 +08002241 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
Vinicius Costa Gomes988c5992011-08-25 20:02:28 -03002242 return 0;
2243
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03002244 smp = smp_chan_create(conn);
Johan Hedbergc29d2442014-06-16 19:25:14 +03002245 if (!smp)
2246 return SMP_UNSPECIFIED;
Vinicius Costa Gomesd26a2342011-08-19 21:06:51 -03002247
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07002248 if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
Johan Hedbergc05b9332014-09-10 17:37:42 -07002249 (auth & SMP_AUTH_BONDING))
Johan Hedberg616d55b2014-07-29 14:18:48 +03002250 return SMP_PAIRING_NOTSUPP;
2251
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002252 skb_pull(skb, sizeof(*rp));
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002253
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002254 memset(&cp, 0, sizeof(cp));
Johan Hedbergc05b9332014-09-10 17:37:42 -07002255 build_pairing_cmd(conn, &cp, NULL, auth);
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002256
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -03002257 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2258 memcpy(&smp->preq[1], &cp, sizeof(cp));
Anderson Brigliaf01ead32011-06-09 18:50:45 -03002259
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002260 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
Johan Hedbergb28b4942014-09-05 22:19:55 +03002261 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -03002262
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002263 return 0;
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002264}
2265
Vinicius Costa Gomescc110922012-08-23 21:32:43 -03002266int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002267{
Vinicius Costa Gomescc110922012-08-23 21:32:43 -03002268 struct l2cap_conn *conn = hcon->l2cap_data;
Johan Hedbergc68b7f12014-09-06 06:59:10 +03002269 struct l2cap_chan *chan;
Johan Hedberg0a66cf22014-03-24 14:39:03 +02002270 struct smp_chan *smp;
Brian Gix2b64d152011-12-21 16:12:12 -08002271 __u8 authreq;
Johan Hedbergfc75cc82014-09-05 22:19:52 +03002272 int ret;
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002273
Vinicius Costa Gomes3a0259b2011-06-09 18:50:43 -03002274 BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
2275
Johan Hedberg0a66cf22014-03-24 14:39:03 +02002276 /* This may be NULL if there's an unexpected disconnection */
2277 if (!conn)
2278 return 1;
2279
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07002280 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED))
Andre Guedes2e65c9d2011-06-30 19:20:56 -03002281 return 1;
2282
Johan Hedberg35dc6f82014-11-13 10:55:18 +02002283 if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
Vinicius Costa Gomesf1cb9af2011-01-26 21:42:57 -03002284 return 1;
2285
Johan Hedbergc7262e72014-06-17 13:07:37 +03002286 if (sec_level > hcon->pending_sec_level)
2287 hcon->pending_sec_level = sec_level;
2288
Johan Hedberg40bef302014-07-16 11:42:27 +03002289 if (hcon->role == HCI_ROLE_MASTER)
Johan Hedbergc7262e72014-06-17 13:07:37 +03002290 if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
2291 return 0;
Vinicius Costa Gomesd26a2342011-08-19 21:06:51 -03002292
Johan Hedbergd8949aa2015-09-04 12:22:46 +03002293 chan = conn->smp;
2294 if (!chan) {
2295 BT_ERR("SMP security requested but not available");
2296 return 1;
2297 }
2298
Johan Hedbergfc75cc82014-09-05 22:19:52 +03002299 l2cap_chan_lock(chan);
2300
2301 /* If SMP is already in progress ignore this request */
2302 if (chan->data) {
2303 ret = 0;
2304 goto unlock;
2305 }
Vinicius Costa Gomesd26a2342011-08-19 21:06:51 -03002306
Vinicius Costa Gomes8aab4752011-09-05 14:31:31 -03002307 smp = smp_chan_create(conn);
Johan Hedbergfc75cc82014-09-05 22:19:52 +03002308 if (!smp) {
2309 ret = 1;
2310 goto unlock;
2311 }
Brian Gix2b64d152011-12-21 16:12:12 -08002312
2313 authreq = seclevel_to_authreq(sec_level);
Vinicius Costa Gomesd26a2342011-08-19 21:06:51 -03002314
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07002315 if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED))
Johan Hedbergd2eb9e12014-05-16 10:59:06 +03002316 authreq |= SMP_AUTH_SC;
2317
Johan Hedberg79897d22014-06-01 09:45:24 +03002318 /* Require MITM if IO Capability allows or the security level
2319 * requires it.
Johan Hedberg2e233642014-03-18 15:42:30 +02002320 */
Johan Hedberg79897d22014-06-01 09:45:24 +03002321 if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
Johan Hedbergc7262e72014-06-17 13:07:37 +03002322 hcon->pending_sec_level > BT_SECURITY_MEDIUM)
Johan Hedberg2e233642014-03-18 15:42:30 +02002323 authreq |= SMP_AUTH_MITM;
2324
Johan Hedberg40bef302014-07-16 11:42:27 +03002325 if (hcon->role == HCI_ROLE_MASTER) {
Vinicius Costa Gomesd26a2342011-08-19 21:06:51 -03002326 struct smp_cmd_pairing cp;
Anderson Brigliaf01ead32011-06-09 18:50:45 -03002327
Brian Gix2b64d152011-12-21 16:12:12 -08002328 build_pairing_cmd(conn, &cp, NULL, authreq);
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -03002329 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2330 memcpy(&smp->preq[1], &cp, sizeof(cp));
Anderson Brigliaf01ead32011-06-09 18:50:45 -03002331
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002332 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
Johan Hedbergb28b4942014-09-05 22:19:55 +03002333 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002334 } else {
2335 struct smp_cmd_security_req cp;
Brian Gix2b64d152011-12-21 16:12:12 -08002336 cp.auth_req = authreq;
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002337 smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
Johan Hedbergb28b4942014-09-05 22:19:55 +03002338 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ);
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002339 }
2340
Johan Hedberg4a74d652014-05-20 09:45:50 +03002341 set_bit(SMP_FLAG_INITIATOR, &smp->flags);
Johan Hedbergfc75cc82014-09-05 22:19:52 +03002342 ret = 0;
Johan Hedbergedca7922014-03-24 15:54:11 +02002343
Johan Hedbergfc75cc82014-09-05 22:19:52 +03002344unlock:
2345 l2cap_chan_unlock(chan);
2346 return ret;
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002347}
2348
Johan Hedbergc81d5552015-10-22 09:38:35 +03002349void smp_cancel_pairing(struct hci_conn *hcon)
2350{
2351 struct l2cap_conn *conn = hcon->l2cap_data;
2352 struct l2cap_chan *chan;
2353 struct smp_chan *smp;
2354
2355 if (!conn)
2356 return;
2357
2358 chan = conn->smp;
2359 if (!chan)
2360 return;
2361
2362 l2cap_chan_lock(chan);
2363
2364 smp = chan->data;
2365 if (smp) {
2366 if (test_bit(SMP_FLAG_COMPLETE, &smp->flags))
2367 smp_failure(conn, 0);
2368 else
2369 smp_failure(conn, SMP_UNSPECIFIED);
2370 }
2371
2372 l2cap_chan_unlock(chan);
2373}
2374
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002375static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
2376{
Vinicius Costa Gomes16b90832011-07-07 18:59:39 -03002377 struct smp_cmd_encrypt_info *rp = (void *) skb->data;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002378 struct l2cap_chan *chan = conn->smp;
2379 struct smp_chan *smp = chan->data;
Vinicius Costa Gomes16b90832011-07-07 18:59:39 -03002380
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002381 BT_DBG("conn %p", conn);
2382
2383 if (skb->len < sizeof(*rp))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002384 return SMP_INVALID_PARAMS;
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002385
Johan Hedbergb28b4942014-09-05 22:19:55 +03002386 SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT);
Johan Hedberg6131ddc2014-02-18 10:19:37 +02002387
Vinicius Costa Gomes16b90832011-07-07 18:59:39 -03002388 skb_pull(skb, sizeof(*rp));
2389
Vinicius Costa Gomes1c1def02011-09-05 14:31:30 -03002390 memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
Vinicius Costa Gomes16b90832011-07-07 18:59:39 -03002391
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002392 return 0;
2393}
2394
2395static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
2396{
Vinicius Costa Gomes16b90832011-07-07 18:59:39 -03002397 struct smp_cmd_master_ident *rp = (void *) skb->data;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002398 struct l2cap_chan *chan = conn->smp;
2399 struct smp_chan *smp = chan->data;
Vinicius Costa Gomesc9839a12012-02-02 21:08:01 -03002400 struct hci_dev *hdev = conn->hcon->hdev;
2401 struct hci_conn *hcon = conn->hcon;
Johan Hedberg23d0e122014-02-19 14:57:46 +02002402 struct smp_ltk *ltk;
Vinicius Costa Gomesc9839a12012-02-02 21:08:01 -03002403 u8 authenticated;
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002404
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002405 BT_DBG("conn %p", conn);
2406
2407 if (skb->len < sizeof(*rp))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002408 return SMP_INVALID_PARAMS;
Johan Hedbergc46b98b2014-02-18 10:19:29 +02002409
Johan Hedberg9747a9f2014-02-26 23:33:43 +02002410 /* Mark the information as received */
2411 smp->remote_key_dist &= ~SMP_DIST_ENC_KEY;
2412
Johan Hedbergb28b4942014-09-05 22:19:55 +03002413 if (smp->remote_key_dist & SMP_DIST_ID_KEY)
2414 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
Johan Hedberg196332f2014-09-09 16:21:46 -07002415 else if (smp->remote_key_dist & SMP_DIST_SIGN)
2416 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
Johan Hedbergb28b4942014-09-05 22:19:55 +03002417
Vinicius Costa Gomes16b90832011-07-07 18:59:39 -03002418 skb_pull(skb, sizeof(*rp));
2419
Marcel Holtmannce39fb42013-10-13 02:23:39 -07002420 authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
Johan Hedberg2ceba532014-06-16 19:25:16 +03002421 ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
Johan Hedberg23d0e122014-02-19 14:57:46 +02002422 authenticated, smp->tk, smp->enc_key_size,
2423 rp->ediv, rp->rand);
2424 smp->ltk = ltk;
Johan Hedbergc6e81e92014-09-05 22:19:54 +03002425 if (!(smp->remote_key_dist & KEY_DIST_MASK))
Johan Hedbergd6268e82014-09-05 22:19:51 +03002426 smp_distribute_keys(smp);
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002427
2428 return 0;
2429}
2430
Johan Hedbergfd349c02014-02-18 10:19:36 +02002431static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
2432{
2433 struct smp_cmd_ident_info *info = (void *) skb->data;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002434 struct l2cap_chan *chan = conn->smp;
2435 struct smp_chan *smp = chan->data;
Johan Hedbergfd349c02014-02-18 10:19:36 +02002436
2437 BT_DBG("");
2438
2439 if (skb->len < sizeof(*info))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002440 return SMP_INVALID_PARAMS;
Johan Hedbergfd349c02014-02-18 10:19:36 +02002441
Johan Hedbergb28b4942014-09-05 22:19:55 +03002442 SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO);
Johan Hedberg6131ddc2014-02-18 10:19:37 +02002443
Johan Hedbergfd349c02014-02-18 10:19:36 +02002444 skb_pull(skb, sizeof(*info));
2445
2446 memcpy(smp->irk, info->irk, 16);
2447
2448 return 0;
2449}
2450
2451static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
2452 struct sk_buff *skb)
2453{
2454 struct smp_cmd_ident_addr_info *info = (void *) skb->data;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002455 struct l2cap_chan *chan = conn->smp;
2456 struct smp_chan *smp = chan->data;
Johan Hedbergfd349c02014-02-18 10:19:36 +02002457 struct hci_conn *hcon = conn->hcon;
2458 bdaddr_t rpa;
2459
2460 BT_DBG("");
2461
2462 if (skb->len < sizeof(*info))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002463 return SMP_INVALID_PARAMS;
Johan Hedbergfd349c02014-02-18 10:19:36 +02002464
Johan Hedberg9747a9f2014-02-26 23:33:43 +02002465 /* Mark the information as received */
2466 smp->remote_key_dist &= ~SMP_DIST_ID_KEY;
2467
Johan Hedbergb28b4942014-09-05 22:19:55 +03002468 if (smp->remote_key_dist & SMP_DIST_SIGN)
2469 SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
2470
Johan Hedbergfd349c02014-02-18 10:19:36 +02002471 skb_pull(skb, sizeof(*info));
2472
Johan Hedberga9a58f82014-02-25 22:24:37 +02002473 /* Strictly speaking the Core Specification (4.1) allows sending
2474 * an empty address which would force us to rely on just the IRK
2475 * as "identity information". However, since such
2476 * implementations are not known of and in order to not over
2477 * complicate our implementation, simply pretend that we never
2478 * received an IRK for such a device.
Johan Hedberge12af482015-01-14 20:51:37 +02002479 *
2480 * The Identity Address must also be a Static Random or Public
2481 * Address, which hci_is_identity_address() checks for.
Johan Hedberga9a58f82014-02-25 22:24:37 +02002482 */
Johan Hedberge12af482015-01-14 20:51:37 +02002483 if (!bacmp(&info->bdaddr, BDADDR_ANY) ||
2484 !hci_is_identity_address(&info->bdaddr, info->addr_type)) {
Johan Hedberga9a58f82014-02-25 22:24:37 +02002485 BT_ERR("Ignoring IRK with no identity address");
Johan Hedberg31dd6242014-06-27 14:23:02 +03002486 goto distribute;
Johan Hedberga9a58f82014-02-25 22:24:37 +02002487 }
2488
Johan Hedbergfd349c02014-02-18 10:19:36 +02002489 bacpy(&smp->id_addr, &info->bdaddr);
2490 smp->id_addr_type = info->addr_type;
2491
2492 if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type))
2493 bacpy(&rpa, &hcon->dst);
2494 else
2495 bacpy(&rpa, BDADDR_ANY);
2496
Johan Hedberg23d0e122014-02-19 14:57:46 +02002497 smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr,
2498 smp->id_addr_type, smp->irk, &rpa);
Johan Hedbergfd349c02014-02-18 10:19:36 +02002499
Johan Hedberg31dd6242014-06-27 14:23:02 +03002500distribute:
Johan Hedbergc6e81e92014-09-05 22:19:54 +03002501 if (!(smp->remote_key_dist & KEY_DIST_MASK))
2502 smp_distribute_keys(smp);
Johan Hedbergfd349c02014-02-18 10:19:36 +02002503
2504 return 0;
2505}
2506
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002507static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
2508{
2509 struct smp_cmd_sign_info *rp = (void *) skb->data;
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002510 struct l2cap_chan *chan = conn->smp;
2511 struct smp_chan *smp = chan->data;
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002512 struct smp_csrk *csrk;
2513
2514 BT_DBG("conn %p", conn);
2515
2516 if (skb->len < sizeof(*rp))
Johan Hedberg38e4a912014-05-08 14:19:11 +03002517 return SMP_INVALID_PARAMS;
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002518
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002519 /* Mark the information as received */
2520 smp->remote_key_dist &= ~SMP_DIST_SIGN;
2521
2522 skb_pull(skb, sizeof(*rp));
2523
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002524 csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
2525 if (csrk) {
Johan Hedberg4cd39282015-02-27 10:11:13 +02002526 if (conn->hcon->sec_level > BT_SECURITY_MEDIUM)
2527 csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED;
2528 else
2529 csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED;
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002530 memcpy(csrk->val, rp->csrk, sizeof(csrk->val));
2531 }
2532 smp->csrk = csrk;
Johan Hedbergd6268e82014-09-05 22:19:51 +03002533 smp_distribute_keys(smp);
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002534
2535 return 0;
2536}
2537
Johan Hedberg5e3d3d92014-05-31 18:51:02 +03002538static u8 sc_select_method(struct smp_chan *smp)
2539{
2540 struct l2cap_conn *conn = smp->conn;
2541 struct hci_conn *hcon = conn->hcon;
2542 struct smp_cmd_pairing *local, *remote;
2543 u8 local_mitm, remote_mitm, local_io, remote_io, method;
2544
Johan Hedberg1a8bab42015-03-16 11:45:44 +02002545 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) ||
2546 test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags))
Johan Hedberga29b0732014-10-28 15:17:05 +01002547 return REQ_OOB;
2548
Johan Hedberg5e3d3d92014-05-31 18:51:02 +03002549 /* The preq/prsp contain the raw Pairing Request/Response PDUs
2550 * which are needed as inputs to some crypto functions. To get
2551 * the "struct smp_cmd_pairing" from them we need to skip the
2552 * first byte which contains the opcode.
2553 */
2554 if (hcon->out) {
2555 local = (void *) &smp->preq[1];
2556 remote = (void *) &smp->prsp[1];
2557 } else {
2558 local = (void *) &smp->prsp[1];
2559 remote = (void *) &smp->preq[1];
2560 }
2561
2562 local_io = local->io_capability;
2563 remote_io = remote->io_capability;
2564
2565 local_mitm = (local->auth_req & SMP_AUTH_MITM);
2566 remote_mitm = (remote->auth_req & SMP_AUTH_MITM);
2567
2568 /* If either side wants MITM, look up the method from the table,
2569 * otherwise use JUST WORKS.
2570 */
2571 if (local_mitm || remote_mitm)
2572 method = get_auth_method(smp, local_io, remote_io);
2573 else
2574 method = JUST_WORKS;
2575
2576 /* Don't confirm locally initiated pairing attempts */
2577 if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
2578 method = JUST_WORKS;
2579
2580 return method;
2581}
2582
Johan Hedbergd8f8edb2014-06-06 11:09:28 +03002583static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
2584{
2585 struct smp_cmd_public_key *key = (void *) skb->data;
2586 struct hci_conn *hcon = conn->hcon;
2587 struct l2cap_chan *chan = conn->smp;
2588 struct smp_chan *smp = chan->data;
Johan Hedberg5e3d3d92014-05-31 18:51:02 +03002589 struct hci_dev *hdev = hcon->hdev;
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +03002590 struct smp_cmd_pairing_confirm cfm;
Johan Hedbergd8f8edb2014-06-06 11:09:28 +03002591 int err;
2592
2593 BT_DBG("conn %p", conn);
2594
2595 if (skb->len < sizeof(*key))
2596 return SMP_INVALID_PARAMS;
2597
2598 memcpy(smp->remote_pk, key, 64);
2599
Johan Hedberga8ca6172015-03-16 18:12:57 +02002600 if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {
2601 err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
2602 smp->rr, 0, cfm.confirm_val);
2603 if (err)
2604 return SMP_UNSPECIFIED;
2605
2606 if (memcmp(cfm.confirm_val, smp->pcnf, 16))
2607 return SMP_CONFIRM_FAILED;
2608 }
2609
Johan Hedbergd8f8edb2014-06-06 11:09:28 +03002610 /* Non-initiating device sends its public key after receiving
2611 * the key from the initiating device.
2612 */
2613 if (!hcon->out) {
2614 err = sc_send_public_key(smp);
2615 if (err)
2616 return err;
2617 }
2618
Johan Hedbergc7a3d572014-12-01 22:03:16 +02002619 SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk);
Marcel Holtmanne0915262015-03-16 12:34:55 -07002620 SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32);
Johan Hedbergd8f8edb2014-06-06 11:09:28 +03002621
2622 if (!ecdh_shared_secret(smp->remote_pk, smp->local_sk, smp->dhkey))
2623 return SMP_UNSPECIFIED;
2624
Johan Hedbergc7a3d572014-12-01 22:03:16 +02002625 SMP_DBG("DHKey %32phN", smp->dhkey);
Johan Hedbergd8f8edb2014-06-06 11:09:28 +03002626
2627 set_bit(SMP_FLAG_REMOTE_PK, &smp->flags);
2628
Johan Hedberg5e3d3d92014-05-31 18:51:02 +03002629 smp->method = sc_select_method(smp);
2630
2631 BT_DBG("%s selected method 0x%02x", hdev->name, smp->method);
2632
2633 /* JUST_WORKS and JUST_CFM result in an unauthenticated key */
2634 if (smp->method == JUST_WORKS || smp->method == JUST_CFM)
2635 hcon->pending_sec_level = BT_SECURITY_MEDIUM;
2636 else
2637 hcon->pending_sec_level = BT_SECURITY_FIPS;
2638
Johan Hedbergaeb7d462014-05-31 18:52:28 +03002639 if (!memcmp(debug_pk, smp->remote_pk, 64))
2640 set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
2641
Johan Hedberg38606f12014-06-25 11:10:28 +03002642 if (smp->method == DSP_PASSKEY) {
2643 get_random_bytes(&hcon->passkey_notify,
2644 sizeof(hcon->passkey_notify));
2645 hcon->passkey_notify %= 1000000;
2646 hcon->passkey_entered = 0;
2647 smp->passkey_round = 0;
2648 if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type,
2649 hcon->dst_type,
2650 hcon->passkey_notify,
2651 hcon->passkey_entered))
2652 return SMP_UNSPECIFIED;
2653 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2654 return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
2655 }
2656
Johan Hedberg94ea7252015-03-16 11:45:46 +02002657 if (smp->method == REQ_OOB) {
Johan Hedberga29b0732014-10-28 15:17:05 +01002658 if (hcon->out)
2659 smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
2660 sizeof(smp->prnd), smp->prnd);
2661
2662 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2663
2664 return 0;
2665 }
2666
Johan Hedberg38606f12014-06-25 11:10:28 +03002667 if (hcon->out)
2668 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2669
2670 if (smp->method == REQ_PASSKEY) {
2671 if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type,
2672 hcon->dst_type))
2673 return SMP_UNSPECIFIED;
2674 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
2675 set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
2676 return 0;
2677 }
2678
Johan Hedbergcbbbe3e2014-06-06 11:30:08 +03002679 /* The Initiating device waits for the non-initiating device to
2680 * send the confirm value.
2681 */
2682 if (conn->hcon->out)
2683 return 0;
2684
2685 err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd,
2686 0, cfm.confirm_val);
2687 if (err)
2688 return SMP_UNSPECIFIED;
2689
2690 smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
2691 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
2692
Johan Hedbergd8f8edb2014-06-06 11:09:28 +03002693 return 0;
2694}
2695
Johan Hedberg6433a9a2014-06-06 11:47:30 +03002696static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb)
2697{
2698 struct smp_cmd_dhkey_check *check = (void *) skb->data;
2699 struct l2cap_chan *chan = conn->smp;
2700 struct hci_conn *hcon = conn->hcon;
2701 struct smp_chan *smp = chan->data;
2702 u8 a[7], b[7], *local_addr, *remote_addr;
2703 u8 io_cap[3], r[16], e[16];
2704 int err;
2705
2706 BT_DBG("conn %p", conn);
2707
2708 if (skb->len < sizeof(*check))
2709 return SMP_INVALID_PARAMS;
2710
2711 memcpy(a, &hcon->init_addr, 6);
2712 memcpy(b, &hcon->resp_addr, 6);
2713 a[6] = hcon->init_addr_type;
2714 b[6] = hcon->resp_addr_type;
2715
2716 if (hcon->out) {
2717 local_addr = a;
2718 remote_addr = b;
2719 memcpy(io_cap, &smp->prsp[1], 3);
2720 } else {
2721 local_addr = b;
2722 remote_addr = a;
2723 memcpy(io_cap, &smp->preq[1], 3);
2724 }
2725
2726 memset(r, 0, sizeof(r));
2727
Johan Hedberg38606f12014-06-25 11:10:28 +03002728 if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
2729 put_unaligned_le32(hcon->passkey_notify, r);
Johan Hedberg882fafa2015-03-16 11:45:43 +02002730 else if (smp->method == REQ_OOB)
2731 memcpy(r, smp->lr, 16);
Johan Hedberg38606f12014-06-25 11:10:28 +03002732
Johan Hedberg6433a9a2014-06-06 11:47:30 +03002733 err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r,
2734 io_cap, remote_addr, local_addr, e);
2735 if (err)
2736 return SMP_UNSPECIFIED;
2737
2738 if (memcmp(check->e, e, 16))
2739 return SMP_DHKEY_CHECK_FAILED;
2740
Johan Hedbergd3e54a82014-06-04 11:07:40 +03002741 if (!hcon->out) {
2742 if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
2743 set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags);
2744 return 0;
2745 }
Johan Hedbergd378a2d2014-05-31 18:53:36 +03002746
Johan Hedbergd3e54a82014-06-04 11:07:40 +03002747 /* Slave sends DHKey check as response to master */
2748 sc_dhkey_check(smp);
2749 }
Johan Hedbergd378a2d2014-05-31 18:53:36 +03002750
Johan Hedbergd3e54a82014-06-04 11:07:40 +03002751 sc_add_ltk(smp);
Johan Hedberg6433a9a2014-06-06 11:47:30 +03002752
2753 if (hcon->out) {
Johan Hedberg8b76ce32015-06-08 18:14:39 +03002754 hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size);
Johan Hedberg6433a9a2014-06-06 11:47:30 +03002755 hcon->enc_key_size = smp->enc_key_size;
2756 }
2757
2758 return 0;
2759}
2760
Johan Hedberg1408bb62014-06-04 22:45:57 +03002761static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
2762 struct sk_buff *skb)
2763{
2764 struct smp_cmd_keypress_notify *kp = (void *) skb->data;
2765
2766 BT_DBG("value 0x%02x", kp->value);
2767
2768 return 0;
2769}
2770
Johan Hedberg4befb862014-08-11 22:06:38 +03002771static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002772{
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002773 struct l2cap_conn *conn = chan->conn;
Marcel Holtmann7b9899d2013-10-03 00:00:57 -07002774 struct hci_conn *hcon = conn->hcon;
Johan Hedbergb28b4942014-09-05 22:19:55 +03002775 struct smp_chan *smp;
Marcel Holtmann92381f52013-10-03 01:23:08 -07002776 __u8 code, reason;
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002777 int err = 0;
2778
Johan Hedberg8ae9b982014-08-11 22:06:39 +03002779 if (skb->len < 1)
Marcel Holtmann92381f52013-10-03 01:23:08 -07002780 return -EILSEQ;
Marcel Holtmann92381f52013-10-03 01:23:08 -07002781
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07002782 if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) {
Andre Guedes2e65c9d2011-06-30 19:20:56 -03002783 reason = SMP_PAIRING_NOTSUPP;
2784 goto done;
2785 }
2786
Marcel Holtmann92381f52013-10-03 01:23:08 -07002787 code = skb->data[0];
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002788 skb_pull(skb, sizeof(code));
2789
Johan Hedbergb28b4942014-09-05 22:19:55 +03002790 smp = chan->data;
2791
2792 if (code > SMP_CMD_MAX)
2793 goto drop;
2794
Johan Hedberg24bd0bd2014-09-10 17:37:43 -07002795 if (smp && !test_and_clear_bit(code, &smp->allow_cmd))
Johan Hedbergb28b4942014-09-05 22:19:55 +03002796 goto drop;
2797
2798 /* If we don't have a context the only allowed commands are
2799 * pairing request and security request.
Johan Hedberg8cf9fa12013-01-29 10:44:23 -06002800 */
Johan Hedbergb28b4942014-09-05 22:19:55 +03002801 if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ)
2802 goto drop;
Johan Hedberg8cf9fa12013-01-29 10:44:23 -06002803
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002804 switch (code) {
2805 case SMP_CMD_PAIRING_REQ:
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002806 reason = smp_cmd_pairing_req(conn, skb);
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002807 break;
2808
2809 case SMP_CMD_PAIRING_FAIL:
Johan Hedberg84794e12013-11-06 11:24:57 +02002810 smp_failure(conn, 0);
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002811 err = -EPERM;
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002812 break;
2813
2814 case SMP_CMD_PAIRING_RSP:
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002815 reason = smp_cmd_pairing_rsp(conn, skb);
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002816 break;
2817
2818 case SMP_CMD_SECURITY_REQ:
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002819 reason = smp_cmd_security_req(conn, skb);
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002820 break;
2821
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002822 case SMP_CMD_PAIRING_CONFIRM:
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002823 reason = smp_cmd_pairing_confirm(conn, skb);
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002824 break;
2825
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002826 case SMP_CMD_PAIRING_RANDOM:
Vinicius Costa Gomesda85e5e2011-06-09 18:50:53 -03002827 reason = smp_cmd_pairing_random(conn, skb);
Anderson Briglia88ba43b2011-06-09 18:50:42 -03002828 break;
2829
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002830 case SMP_CMD_ENCRYPT_INFO:
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002831 reason = smp_cmd_encrypt_info(conn, skb);
2832 break;
2833
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002834 case SMP_CMD_MASTER_IDENT:
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002835 reason = smp_cmd_master_ident(conn, skb);
2836 break;
2837
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002838 case SMP_CMD_IDENT_INFO:
Johan Hedbergfd349c02014-02-18 10:19:36 +02002839 reason = smp_cmd_ident_info(conn, skb);
2840 break;
2841
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002842 case SMP_CMD_IDENT_ADDR_INFO:
Johan Hedbergfd349c02014-02-18 10:19:36 +02002843 reason = smp_cmd_ident_addr_info(conn, skb);
2844 break;
2845
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002846 case SMP_CMD_SIGN_INFO:
Marcel Holtmann7ee4ea32014-03-09 12:19:17 -07002847 reason = smp_cmd_sign_info(conn, skb);
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002848 break;
2849
Johan Hedbergd8f8edb2014-06-06 11:09:28 +03002850 case SMP_CMD_PUBLIC_KEY:
2851 reason = smp_cmd_public_key(conn, skb);
2852 break;
2853
Johan Hedberg6433a9a2014-06-06 11:47:30 +03002854 case SMP_CMD_DHKEY_CHECK:
2855 reason = smp_cmd_dhkey_check(conn, skb);
2856 break;
2857
Johan Hedberg1408bb62014-06-04 22:45:57 +03002858 case SMP_CMD_KEYPRESS_NOTIFY:
2859 reason = smp_cmd_keypress_notify(conn, skb);
2860 break;
2861
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002862 default:
2863 BT_DBG("Unknown command code 0x%2.2x", code);
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002864 reason = SMP_CMD_NOTSUPP;
Vinicius Costa Gomes3a0259b2011-06-09 18:50:43 -03002865 goto done;
2866 }
2867
2868done:
Johan Hedberg9b7b18e2014-08-18 20:33:31 +03002869 if (!err) {
2870 if (reason)
2871 smp_failure(conn, reason);
Johan Hedberg8ae9b982014-08-11 22:06:39 +03002872 kfree_skb(skb);
Johan Hedberg9b7b18e2014-08-18 20:33:31 +03002873 }
2874
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002875 return err;
Johan Hedbergb28b4942014-09-05 22:19:55 +03002876
2877drop:
2878 BT_ERR("%s unexpected SMP command 0x%02x from %pMR", hcon->hdev->name,
2879 code, &hcon->dst);
2880 kfree_skb(skb);
2881 return 0;
Anderson Brigliaeb492e02011-06-09 18:50:40 -03002882}
Vinicius Costa Gomes7034b912011-07-07 18:59:34 -03002883
Johan Hedberg70db83c2014-08-08 09:37:16 +03002884static void smp_teardown_cb(struct l2cap_chan *chan, int err)
2885{
2886 struct l2cap_conn *conn = chan->conn;
2887
2888 BT_DBG("chan %p", chan);
2889
Johan Hedbergfc75cc82014-09-05 22:19:52 +03002890 if (chan->data)
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002891 smp_chan_destroy(conn);
Johan Hedberg5d88cc72014-08-08 09:37:18 +03002892
Johan Hedberg70db83c2014-08-08 09:37:16 +03002893 conn->smp = NULL;
2894 l2cap_chan_put(chan);
2895}
2896
Johan Hedbergb5ae3442014-08-14 12:34:26 +03002897static void bredr_pairing(struct l2cap_chan *chan)
2898{
2899 struct l2cap_conn *conn = chan->conn;
2900 struct hci_conn *hcon = conn->hcon;
2901 struct hci_dev *hdev = hcon->hdev;
2902 struct smp_cmd_pairing req;
2903 struct smp_chan *smp;
2904
2905 BT_DBG("chan %p", chan);
2906
2907 /* Only new pairings are interesting */
2908 if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags))
2909 return;
2910
2911 /* Don't bother if we're not encrypted */
2912 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
2913 return;
2914
2915 /* Only master may initiate SMP over BR/EDR */
2916 if (hcon->role != HCI_ROLE_MASTER)
2917 return;
2918
2919 /* Secure Connections support must be enabled */
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07002920 if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED))
Johan Hedbergb5ae3442014-08-14 12:34:26 +03002921 return;
2922
2923 /* BR/EDR must use Secure Connections for SMP */
2924 if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) &&
Marcel Holtmannb7cb93e2015-03-13 10:20:35 -07002925 !hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
Johan Hedbergb5ae3442014-08-14 12:34:26 +03002926 return;
2927
2928 /* If our LE support is not enabled don't do anything */
Marcel Holtmannd7a5a112015-03-13 02:11:00 -07002929 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
Johan Hedbergb5ae3442014-08-14 12:34:26 +03002930 return;
2931
2932 /* Don't bother if remote LE support is not enabled */
2933 if (!lmp_host_le_capable(hcon))
2934 return;
2935
2936 /* Remote must support SMP fixed chan for BR/EDR */
2937 if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR))
2938 return;
2939
2940 /* Don't bother if SMP is already ongoing */
2941 if (chan->data)
2942 return;
2943
2944 smp = smp_chan_create(conn);
2945 if (!smp) {
2946 BT_ERR("%s unable to create SMP context for BR/EDR",
2947 hdev->name);
2948 return;
2949 }
2950
2951 set_bit(SMP_FLAG_SC, &smp->flags);
2952
2953 BT_DBG("%s starting SMP over BR/EDR", hdev->name);
2954
2955 /* Prepare and send the BR/EDR SMP Pairing Request */
2956 build_bredr_pairing_cmd(smp, &req, NULL);
2957
2958 smp->preq[0] = SMP_CMD_PAIRING_REQ;
2959 memcpy(&smp->preq[1], &req, sizeof(req));
2960
2961 smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req);
2962 SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
2963}
2964
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03002965static void smp_resume_cb(struct l2cap_chan *chan)
2966{
Johan Hedbergb68fda62014-08-11 22:06:40 +03002967 struct smp_chan *smp = chan->data;
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03002968 struct l2cap_conn *conn = chan->conn;
2969 struct hci_conn *hcon = conn->hcon;
2970
2971 BT_DBG("chan %p", chan);
2972
Johan Hedbergb5ae3442014-08-14 12:34:26 +03002973 if (hcon->type == ACL_LINK) {
2974 bredr_pairing(chan);
Johan Hedbergef8efe42014-08-13 15:12:32 +03002975 return;
Johan Hedbergb5ae3442014-08-14 12:34:26 +03002976 }
Johan Hedbergef8efe42014-08-13 15:12:32 +03002977
Johan Hedberg86d14072014-08-11 22:06:43 +03002978 if (!smp)
2979 return;
Johan Hedbergb68fda62014-08-11 22:06:40 +03002980
Johan Hedberg84bc0db2014-09-05 22:19:49 +03002981 if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
2982 return;
2983
Johan Hedberg86d14072014-08-11 22:06:43 +03002984 cancel_delayed_work(&smp->security_timer);
2985
Johan Hedbergd6268e82014-09-05 22:19:51 +03002986 smp_distribute_keys(smp);
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03002987}
2988
Johan Hedberg70db83c2014-08-08 09:37:16 +03002989static void smp_ready_cb(struct l2cap_chan *chan)
2990{
2991 struct l2cap_conn *conn = chan->conn;
Johan Hedbergb5ae3442014-08-14 12:34:26 +03002992 struct hci_conn *hcon = conn->hcon;
Johan Hedberg70db83c2014-08-08 09:37:16 +03002993
2994 BT_DBG("chan %p", chan);
2995
Johan Hedberg78837462015-11-11 21:47:12 +02002996 /* No need to call l2cap_chan_hold() here since we already own
2997 * the reference taken in smp_new_conn_cb(). This is just the
2998 * first time that we tie it to a specific pointer. The code in
2999 * l2cap_core.c ensures that there's no risk this function wont
3000 * get called if smp_new_conn_cb was previously called.
3001 */
Johan Hedberg70db83c2014-08-08 09:37:16 +03003002 conn->smp = chan;
Johan Hedbergb5ae3442014-08-14 12:34:26 +03003003
3004 if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
3005 bredr_pairing(chan);
Johan Hedberg70db83c2014-08-08 09:37:16 +03003006}
3007
Johan Hedberg4befb862014-08-11 22:06:38 +03003008static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
3009{
3010 int err;
3011
3012 BT_DBG("chan %p", chan);
3013
3014 err = smp_sig_channel(chan, skb);
3015 if (err) {
Johan Hedbergb68fda62014-08-11 22:06:40 +03003016 struct smp_chan *smp = chan->data;
Johan Hedberg4befb862014-08-11 22:06:38 +03003017
Johan Hedbergb68fda62014-08-11 22:06:40 +03003018 if (smp)
3019 cancel_delayed_work_sync(&smp->security_timer);
Johan Hedberg4befb862014-08-11 22:06:38 +03003020
Johan Hedberg1e91c292014-08-18 20:33:29 +03003021 hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);
Johan Hedberg4befb862014-08-11 22:06:38 +03003022 }
3023
3024 return err;
3025}
3026
Johan Hedberg70db83c2014-08-08 09:37:16 +03003027static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan,
3028 unsigned long hdr_len,
3029 unsigned long len, int nb)
3030{
3031 struct sk_buff *skb;
3032
3033 skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
3034 if (!skb)
3035 return ERR_PTR(-ENOMEM);
3036
3037 skb->priority = HCI_PRIO_MAX;
Johan Hedberga4368ff2015-03-30 23:21:01 +03003038 bt_cb(skb)->l2cap.chan = chan;
Johan Hedberg70db83c2014-08-08 09:37:16 +03003039
3040 return skb;
3041}
3042
3043static const struct l2cap_ops smp_chan_ops = {
3044 .name = "Security Manager",
3045 .ready = smp_ready_cb,
Johan Hedberg5d88cc72014-08-08 09:37:18 +03003046 .recv = smp_recv_cb,
Johan Hedberg70db83c2014-08-08 09:37:16 +03003047 .alloc_skb = smp_alloc_skb_cb,
3048 .teardown = smp_teardown_cb,
Johan Hedberg44f1a7a2014-08-11 22:06:36 +03003049 .resume = smp_resume_cb,
Johan Hedberg70db83c2014-08-08 09:37:16 +03003050
3051 .new_connection = l2cap_chan_no_new_connection,
Johan Hedberg70db83c2014-08-08 09:37:16 +03003052 .state_change = l2cap_chan_no_state_change,
3053 .close = l2cap_chan_no_close,
3054 .defer = l2cap_chan_no_defer,
3055 .suspend = l2cap_chan_no_suspend,
Johan Hedberg70db83c2014-08-08 09:37:16 +03003056 .set_shutdown = l2cap_chan_no_set_shutdown,
3057 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
Johan Hedberg70db83c2014-08-08 09:37:16 +03003058};
3059
3060static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan)
3061{
3062 struct l2cap_chan *chan;
3063
3064 BT_DBG("pchan %p", pchan);
3065
3066 chan = l2cap_chan_create();
3067 if (!chan)
3068 return NULL;
3069
3070 chan->chan_type = pchan->chan_type;
3071 chan->ops = &smp_chan_ops;
3072 chan->scid = pchan->scid;
3073 chan->dcid = chan->scid;
3074 chan->imtu = pchan->imtu;
3075 chan->omtu = pchan->omtu;
3076 chan->mode = pchan->mode;
3077
Johan Hedbergabe84902014-11-12 22:22:21 +02003078 /* Other L2CAP channels may request SMP routines in order to
3079 * change the security level. This means that the SMP channel
3080 * lock must be considered in its own category to avoid lockdep
3081 * warnings.
3082 */
3083 atomic_set(&chan->nesting, L2CAP_NESTING_SMP);
3084
Johan Hedberg70db83c2014-08-08 09:37:16 +03003085 BT_DBG("created chan %p", chan);
3086
3087 return chan;
3088}
3089
3090static const struct l2cap_ops smp_root_chan_ops = {
3091 .name = "Security Manager Root",
3092 .new_connection = smp_new_conn_cb,
3093
3094 /* None of these are implemented for the root channel */
3095 .close = l2cap_chan_no_close,
3096 .alloc_skb = l2cap_chan_no_alloc_skb,
3097 .recv = l2cap_chan_no_recv,
3098 .state_change = l2cap_chan_no_state_change,
3099 .teardown = l2cap_chan_no_teardown,
3100 .ready = l2cap_chan_no_ready,
3101 .defer = l2cap_chan_no_defer,
3102 .suspend = l2cap_chan_no_suspend,
3103 .resume = l2cap_chan_no_resume,
3104 .set_shutdown = l2cap_chan_no_set_shutdown,
3105 .get_sndtimeo = l2cap_chan_no_get_sndtimeo,
Johan Hedberg70db83c2014-08-08 09:37:16 +03003106};
3107
Johan Hedbergef8efe42014-08-13 15:12:32 +03003108static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
Johan Hedberg711eafe2014-08-08 09:32:52 +03003109{
Johan Hedberg70db83c2014-08-08 09:37:16 +03003110 struct l2cap_chan *chan;
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003111 struct smp_dev *smp;
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003112 struct crypto_cipher *tfm_aes;
Herbert Xu71af2f62016-01-24 21:18:30 +08003113 struct crypto_shash *tfm_cmac;
Johan Hedberg70db83c2014-08-08 09:37:16 +03003114
Johan Hedbergef8efe42014-08-13 15:12:32 +03003115 if (cid == L2CAP_CID_SMP_BREDR) {
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003116 smp = NULL;
Johan Hedbergef8efe42014-08-13 15:12:32 +03003117 goto create_chan;
3118 }
Johan Hedberg711eafe2014-08-08 09:32:52 +03003119
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003120 smp = kzalloc(sizeof(*smp), GFP_KERNEL);
3121 if (!smp)
3122 return ERR_PTR(-ENOMEM);
3123
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003124 tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
Johan Hedbergdefce9e2014-08-08 09:37:17 +03003125 if (IS_ERR(tfm_aes)) {
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003126 BT_ERR("Unable to create AES crypto context");
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003127 kzfree(smp);
Fengguang Wufe700772014-12-08 03:04:38 +08003128 return ERR_CAST(tfm_aes);
Johan Hedberg711eafe2014-08-08 09:32:52 +03003129 }
3130
Herbert Xu71af2f62016-01-24 21:18:30 +08003131 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
Marcel Holtmann6e2dc6d2015-03-16 01:10:21 -07003132 if (IS_ERR(tfm_cmac)) {
3133 BT_ERR("Unable to create CMAC crypto context");
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003134 crypto_free_cipher(tfm_aes);
Marcel Holtmann6e2dc6d2015-03-16 01:10:21 -07003135 kzfree(smp);
3136 return ERR_CAST(tfm_cmac);
3137 }
3138
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003139 smp->tfm_aes = tfm_aes;
Marcel Holtmann6e2dc6d2015-03-16 01:10:21 -07003140 smp->tfm_cmac = tfm_cmac;
Johan Hedbergb1f663c2015-06-11 13:52:27 +03003141 smp->min_key_size = SMP_MIN_ENC_KEY_SIZE;
Johan Hedberg2fd36552015-06-11 13:52:26 +03003142 smp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003143
Johan Hedbergef8efe42014-08-13 15:12:32 +03003144create_chan:
Johan Hedberg70db83c2014-08-08 09:37:16 +03003145 chan = l2cap_chan_create();
3146 if (!chan) {
Marcel Holtmann63511f6d2015-03-17 11:38:24 -07003147 if (smp) {
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003148 crypto_free_cipher(smp->tfm_aes);
Herbert Xu71af2f62016-01-24 21:18:30 +08003149 crypto_free_shash(smp->tfm_cmac);
Marcel Holtmann63511f6d2015-03-17 11:38:24 -07003150 kzfree(smp);
3151 }
Johan Hedbergef8efe42014-08-13 15:12:32 +03003152 return ERR_PTR(-ENOMEM);
Johan Hedberg70db83c2014-08-08 09:37:16 +03003153 }
3154
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003155 chan->data = smp;
Johan Hedbergdefce9e2014-08-08 09:37:17 +03003156
Johan Hedbergef8efe42014-08-13 15:12:32 +03003157 l2cap_add_scid(chan, cid);
Johan Hedberg70db83c2014-08-08 09:37:16 +03003158
3159 l2cap_chan_set_defaults(chan);
3160
Marcel Holtmann157029b2015-01-14 15:43:09 -08003161 if (cid == L2CAP_CID_SMP) {
Johan Hedberg39e3e742015-02-20 13:48:24 +02003162 u8 bdaddr_type;
3163
3164 hci_copy_identity_address(hdev, &chan->src, &bdaddr_type);
3165
3166 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
Marcel Holtmann157029b2015-01-14 15:43:09 -08003167 chan->src_type = BDADDR_LE_PUBLIC;
Johan Hedberg39e3e742015-02-20 13:48:24 +02003168 else
3169 chan->src_type = BDADDR_LE_RANDOM;
Marcel Holtmann157029b2015-01-14 15:43:09 -08003170 } else {
3171 bacpy(&chan->src, &hdev->bdaddr);
Johan Hedbergef8efe42014-08-13 15:12:32 +03003172 chan->src_type = BDADDR_BREDR;
Marcel Holtmann157029b2015-01-14 15:43:09 -08003173 }
3174
Johan Hedberg70db83c2014-08-08 09:37:16 +03003175 chan->state = BT_LISTEN;
3176 chan->mode = L2CAP_MODE_BASIC;
3177 chan->imtu = L2CAP_DEFAULT_MTU;
3178 chan->ops = &smp_root_chan_ops;
3179
Johan Hedbergabe84902014-11-12 22:22:21 +02003180 /* Set correct nesting level for a parent/listening channel */
3181 atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
3182
Johan Hedbergef8efe42014-08-13 15:12:32 +03003183 return chan;
Johan Hedberg711eafe2014-08-08 09:32:52 +03003184}
3185
Johan Hedbergef8efe42014-08-13 15:12:32 +03003186static void smp_del_chan(struct l2cap_chan *chan)
Johan Hedberg711eafe2014-08-08 09:32:52 +03003187{
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003188 struct smp_dev *smp;
Johan Hedberg70db83c2014-08-08 09:37:16 +03003189
Johan Hedbergef8efe42014-08-13 15:12:32 +03003190 BT_DBG("chan %p", chan);
Johan Hedberg711eafe2014-08-08 09:32:52 +03003191
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003192 smp = chan->data;
3193 if (smp) {
Johan Hedbergdefce9e2014-08-08 09:37:17 +03003194 chan->data = NULL;
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003195 crypto_free_cipher(smp->tfm_aes);
Herbert Xu71af2f62016-01-24 21:18:30 +08003196 crypto_free_shash(smp->tfm_cmac);
Marcel Holtmann88a479d2015-03-16 01:10:19 -07003197 kzfree(smp);
Johan Hedberg711eafe2014-08-08 09:32:52 +03003198 }
Johan Hedberg70db83c2014-08-08 09:37:16 +03003199
Johan Hedberg70db83c2014-08-08 09:37:16 +03003200 l2cap_chan_put(chan);
Johan Hedberg711eafe2014-08-08 09:32:52 +03003201}
Johan Hedbergef8efe42014-08-13 15:12:32 +03003202
Marcel Holtmann300acfde2014-12-31 14:43:16 -08003203static ssize_t force_bredr_smp_read(struct file *file,
3204 char __user *user_buf,
3205 size_t count, loff_t *ppos)
3206{
3207 struct hci_dev *hdev = file->private_data;
3208 char buf[3];
3209
Marcel Holtmannb7cb93e2015-03-13 10:20:35 -07003210 buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N';
Marcel Holtmann300acfde2014-12-31 14:43:16 -08003211 buf[1] = '\n';
3212 buf[2] = '\0';
3213 return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
3214}
3215
3216static ssize_t force_bredr_smp_write(struct file *file,
3217 const char __user *user_buf,
3218 size_t count, loff_t *ppos)
3219{
3220 struct hci_dev *hdev = file->private_data;
3221 char buf[32];
3222 size_t buf_size = min(count, (sizeof(buf)-1));
3223 bool enable;
3224
3225 if (copy_from_user(buf, user_buf, buf_size))
3226 return -EFAULT;
3227
3228 buf[buf_size] = '\0';
3229 if (strtobool(buf, &enable))
3230 return -EINVAL;
3231
Marcel Holtmannb7cb93e2015-03-13 10:20:35 -07003232 if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
Marcel Holtmann300acfde2014-12-31 14:43:16 -08003233 return -EALREADY;
3234
3235 if (enable) {
3236 struct l2cap_chan *chan;
3237
3238 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3239 if (IS_ERR(chan))
3240 return PTR_ERR(chan);
3241
3242 hdev->smp_bredr_data = chan;
3243 } else {
3244 struct l2cap_chan *chan;
3245
3246 chan = hdev->smp_bredr_data;
3247 hdev->smp_bredr_data = NULL;
3248 smp_del_chan(chan);
3249 }
3250
Marcel Holtmannb7cb93e2015-03-13 10:20:35 -07003251 hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
Marcel Holtmann300acfde2014-12-31 14:43:16 -08003252
3253 return count;
3254}
3255
3256static const struct file_operations force_bredr_smp_fops = {
3257 .open = simple_open,
3258 .read = force_bredr_smp_read,
3259 .write = force_bredr_smp_write,
3260 .llseek = default_llseek,
3261};
3262
Johan Hedbergb1f663c2015-06-11 13:52:27 +03003263static ssize_t le_min_key_size_read(struct file *file,
3264 char __user *user_buf,
3265 size_t count, loff_t *ppos)
3266{
3267 struct hci_dev *hdev = file->private_data;
3268 char buf[4];
3269
3270 snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size);
3271
3272 return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
3273}
3274
3275static ssize_t le_min_key_size_write(struct file *file,
3276 const char __user *user_buf,
3277 size_t count, loff_t *ppos)
3278{
3279 struct hci_dev *hdev = file->private_data;
3280 char buf[32];
3281 size_t buf_size = min(count, (sizeof(buf) - 1));
3282 u8 key_size;
3283
3284 if (copy_from_user(buf, user_buf, buf_size))
3285 return -EFAULT;
3286
3287 buf[buf_size] = '\0';
3288
3289 sscanf(buf, "%hhu", &key_size);
3290
3291 if (key_size > SMP_DEV(hdev)->max_key_size ||
3292 key_size < SMP_MIN_ENC_KEY_SIZE)
3293 return -EINVAL;
3294
3295 SMP_DEV(hdev)->min_key_size = key_size;
3296
3297 return count;
3298}
3299
3300static const struct file_operations le_min_key_size_fops = {
3301 .open = simple_open,
3302 .read = le_min_key_size_read,
3303 .write = le_min_key_size_write,
3304 .llseek = default_llseek,
3305};
3306
Johan Hedberg2fd36552015-06-11 13:52:26 +03003307static ssize_t le_max_key_size_read(struct file *file,
3308 char __user *user_buf,
3309 size_t count, loff_t *ppos)
3310{
3311 struct hci_dev *hdev = file->private_data;
3312 char buf[4];
3313
3314 snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->max_key_size);
3315
3316 return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
3317}
3318
3319static ssize_t le_max_key_size_write(struct file *file,
3320 const char __user *user_buf,
3321 size_t count, loff_t *ppos)
3322{
3323 struct hci_dev *hdev = file->private_data;
3324 char buf[32];
3325 size_t buf_size = min(count, (sizeof(buf) - 1));
3326 u8 key_size;
3327
3328 if (copy_from_user(buf, user_buf, buf_size))
3329 return -EFAULT;
3330
3331 buf[buf_size] = '\0';
3332
3333 sscanf(buf, "%hhu", &key_size);
3334
Johan Hedbergb1f663c2015-06-11 13:52:27 +03003335 if (key_size > SMP_MAX_ENC_KEY_SIZE ||
3336 key_size < SMP_DEV(hdev)->min_key_size)
Johan Hedberg2fd36552015-06-11 13:52:26 +03003337 return -EINVAL;
3338
3339 SMP_DEV(hdev)->max_key_size = key_size;
3340
3341 return count;
3342}
3343
3344static const struct file_operations le_max_key_size_fops = {
3345 .open = simple_open,
3346 .read = le_max_key_size_read,
3347 .write = le_max_key_size_write,
3348 .llseek = default_llseek,
3349};
3350
Johan Hedbergef8efe42014-08-13 15:12:32 +03003351int smp_register(struct hci_dev *hdev)
3352{
3353 struct l2cap_chan *chan;
3354
3355 BT_DBG("%s", hdev->name);
3356
Marcel Holtmann7e7ec442015-01-14 15:43:10 -08003357 /* If the controller does not support Low Energy operation, then
3358 * there is also no need to register any SMP channel.
3359 */
3360 if (!lmp_le_capable(hdev))
3361 return 0;
3362
Marcel Holtmann2b8df322015-01-15 08:04:21 -08003363 if (WARN_ON(hdev->smp_data)) {
3364 chan = hdev->smp_data;
3365 hdev->smp_data = NULL;
3366 smp_del_chan(chan);
3367 }
3368
Johan Hedbergef8efe42014-08-13 15:12:32 +03003369 chan = smp_add_cid(hdev, L2CAP_CID_SMP);
3370 if (IS_ERR(chan))
3371 return PTR_ERR(chan);
3372
3373 hdev->smp_data = chan;
3374
Johan Hedbergb1f663c2015-06-11 13:52:27 +03003375 debugfs_create_file("le_min_key_size", 0644, hdev->debugfs, hdev,
3376 &le_min_key_size_fops);
Johan Hedberg2fd36552015-06-11 13:52:26 +03003377 debugfs_create_file("le_max_key_size", 0644, hdev->debugfs, hdev,
3378 &le_max_key_size_fops);
3379
Marcel Holtmann300acfde2014-12-31 14:43:16 -08003380 /* If the controller does not support BR/EDR Secure Connections
3381 * feature, then the BR/EDR SMP channel shall not be present.
3382 *
3383 * To test this with Bluetooth 4.0 controllers, create a debugfs
3384 * switch that allows forcing BR/EDR SMP support and accepting
3385 * cross-transport pairing on non-AES encrypted connections.
3386 */
3387 if (!lmp_sc_capable(hdev)) {
3388 debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs,
3389 hdev, &force_bredr_smp_fops);
Szymon Janc83ebb9e2016-09-09 20:24:40 +02003390
3391 /* Flag can be already set here (due to power toggle) */
3392 if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
3393 return 0;
Marcel Holtmann300acfde2014-12-31 14:43:16 -08003394 }
Johan Hedbergef8efe42014-08-13 15:12:32 +03003395
Marcel Holtmann2b8df322015-01-15 08:04:21 -08003396 if (WARN_ON(hdev->smp_bredr_data)) {
3397 chan = hdev->smp_bredr_data;
3398 hdev->smp_bredr_data = NULL;
3399 smp_del_chan(chan);
3400 }
3401
Johan Hedbergef8efe42014-08-13 15:12:32 +03003402 chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
3403 if (IS_ERR(chan)) {
3404 int err = PTR_ERR(chan);
3405 chan = hdev->smp_data;
3406 hdev->smp_data = NULL;
3407 smp_del_chan(chan);
3408 return err;
3409 }
3410
3411 hdev->smp_bredr_data = chan;
3412
3413 return 0;
3414}
3415
3416void smp_unregister(struct hci_dev *hdev)
3417{
3418 struct l2cap_chan *chan;
3419
3420 if (hdev->smp_bredr_data) {
3421 chan = hdev->smp_bredr_data;
3422 hdev->smp_bredr_data = NULL;
3423 smp_del_chan(chan);
3424 }
3425
3426 if (hdev->smp_data) {
3427 chan = hdev->smp_data;
3428 hdev->smp_data = NULL;
3429 smp_del_chan(chan);
3430 }
3431}
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003432
3433#if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
3434
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003435static int __init test_ah(struct crypto_cipher *tfm_aes)
Johan Hedbergcfc41982014-12-30 09:50:40 +02003436{
3437 const u8 irk[16] = {
3438 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3439 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3440 const u8 r[3] = { 0x94, 0x81, 0x70 };
3441 const u8 exp[3] = { 0xaa, 0xfb, 0x0d };
3442 u8 res[3];
3443 int err;
3444
3445 err = smp_ah(tfm_aes, irk, r, res);
3446 if (err)
3447 return err;
3448
3449 if (memcmp(res, exp, 3))
3450 return -EINVAL;
3451
3452 return 0;
3453}
3454
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003455static int __init test_c1(struct crypto_cipher *tfm_aes)
Johan Hedbergcfc41982014-12-30 09:50:40 +02003456{
3457 const u8 k[16] = {
3458 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3459 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3460 const u8 r[16] = {
3461 0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63,
3462 0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 };
3463 const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 };
3464 const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 };
3465 const u8 _iat = 0x01;
3466 const u8 _rat = 0x00;
3467 const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } };
3468 const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } };
3469 const u8 exp[16] = {
3470 0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2,
3471 0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e };
3472 u8 res[16];
3473 int err;
3474
3475 err = smp_c1(tfm_aes, k, r, preq, pres, _iat, &ia, _rat, &ra, res);
3476 if (err)
3477 return err;
3478
3479 if (memcmp(res, exp, 16))
3480 return -EINVAL;
3481
3482 return 0;
3483}
3484
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003485static int __init test_s1(struct crypto_cipher *tfm_aes)
Johan Hedbergcfc41982014-12-30 09:50:40 +02003486{
3487 const u8 k[16] = {
3488 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
3489 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
3490 const u8 r1[16] = {
3491 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 };
3492 const u8 r2[16] = {
3493 0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 };
3494 const u8 exp[16] = {
3495 0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b,
3496 0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a };
3497 u8 res[16];
3498 int err;
3499
3500 err = smp_s1(tfm_aes, k, r1, r2, res);
3501 if (err)
3502 return err;
3503
3504 if (memcmp(res, exp, 16))
3505 return -EINVAL;
3506
3507 return 0;
3508}
3509
Herbert Xu71af2f62016-01-24 21:18:30 +08003510static int __init test_f4(struct crypto_shash *tfm_cmac)
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003511{
3512 const u8 u[32] = {
3513 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3514 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3515 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3516 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3517 const u8 v[32] = {
3518 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3519 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3520 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3521 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3522 const u8 x[16] = {
3523 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3524 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3525 const u8 z = 0x00;
3526 const u8 exp[16] = {
3527 0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1,
3528 0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 };
3529 u8 res[16];
3530 int err;
3531
3532 err = smp_f4(tfm_cmac, u, v, x, z, res);
3533 if (err)
3534 return err;
3535
3536 if (memcmp(res, exp, 16))
3537 return -EINVAL;
3538
3539 return 0;
3540}
3541
Herbert Xu71af2f62016-01-24 21:18:30 +08003542static int __init test_f5(struct crypto_shash *tfm_cmac)
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003543{
3544 const u8 w[32] = {
3545 0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86,
3546 0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99,
3547 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3548 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3549 const u8 n1[16] = {
3550 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3551 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3552 const u8 n2[16] = {
3553 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3554 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3555 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3556 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3557 const u8 exp_ltk[16] = {
3558 0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98,
3559 0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 };
3560 const u8 exp_mackey[16] = {
3561 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3562 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3563 u8 mackey[16], ltk[16];
3564 int err;
3565
3566 err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk);
3567 if (err)
3568 return err;
3569
3570 if (memcmp(mackey, exp_mackey, 16))
3571 return -EINVAL;
3572
3573 if (memcmp(ltk, exp_ltk, 16))
3574 return -EINVAL;
3575
3576 return 0;
3577}
3578
Herbert Xu71af2f62016-01-24 21:18:30 +08003579static int __init test_f6(struct crypto_shash *tfm_cmac)
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003580{
3581 const u8 w[16] = {
3582 0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
3583 0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
3584 const u8 n1[16] = {
3585 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3586 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3587 const u8 n2[16] = {
3588 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3589 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3590 const u8 r[16] = {
3591 0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08,
3592 0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 };
3593 const u8 io_cap[3] = { 0x02, 0x01, 0x01 };
3594 const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
3595 const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
3596 const u8 exp[16] = {
3597 0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2,
3598 0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 };
3599 u8 res[16];
3600 int err;
3601
3602 err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res);
3603 if (err)
3604 return err;
3605
3606 if (memcmp(res, exp, 16))
3607 return -EINVAL;
3608
3609 return 0;
3610}
3611
Herbert Xu71af2f62016-01-24 21:18:30 +08003612static int __init test_g2(struct crypto_shash *tfm_cmac)
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003613{
3614 const u8 u[32] = {
3615 0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
3616 0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
3617 0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
3618 0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
3619 const u8 v[32] = {
3620 0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
3621 0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
3622 0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
3623 0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
3624 const u8 x[16] = {
3625 0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
3626 0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
3627 const u8 y[16] = {
3628 0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
3629 0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
3630 const u32 exp_val = 0x2f9ed5ba % 1000000;
3631 u32 val;
3632 int err;
3633
3634 err = smp_g2(tfm_cmac, u, v, x, y, &val);
3635 if (err)
3636 return err;
3637
3638 if (val != exp_val)
3639 return -EINVAL;
3640
3641 return 0;
3642}
3643
Herbert Xu71af2f62016-01-24 21:18:30 +08003644static int __init test_h6(struct crypto_shash *tfm_cmac)
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003645{
3646 const u8 w[16] = {
3647 0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
3648 0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
3649 const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c };
3650 const u8 exp[16] = {
3651 0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8,
3652 0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d };
3653 u8 res[16];
3654 int err;
3655
3656 err = smp_h6(tfm_cmac, w, key_id, res);
3657 if (err)
3658 return err;
3659
3660 if (memcmp(res, exp, 16))
3661 return -EINVAL;
3662
3663 return 0;
3664}
3665
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003666static char test_smp_buffer[32];
3667
3668static ssize_t test_smp_read(struct file *file, char __user *user_buf,
3669 size_t count, loff_t *ppos)
3670{
3671 return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer,
3672 strlen(test_smp_buffer));
3673}
3674
3675static const struct file_operations test_smp_fops = {
3676 .open = simple_open,
3677 .read = test_smp_read,
3678 .llseek = default_llseek,
3679};
3680
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003681static int __init run_selftests(struct crypto_cipher *tfm_aes,
Herbert Xu71af2f62016-01-24 21:18:30 +08003682 struct crypto_shash *tfm_cmac)
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003683{
Marcel Holtmann255047b2014-12-30 00:11:20 -08003684 ktime_t calltime, delta, rettime;
3685 unsigned long long duration;
Johan Hedbergcfc41982014-12-30 09:50:40 +02003686 int err;
3687
Marcel Holtmann255047b2014-12-30 00:11:20 -08003688 calltime = ktime_get();
3689
Johan Hedbergcfc41982014-12-30 09:50:40 +02003690 err = test_ah(tfm_aes);
3691 if (err) {
3692 BT_ERR("smp_ah test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003693 goto done;
Johan Hedbergcfc41982014-12-30 09:50:40 +02003694 }
3695
3696 err = test_c1(tfm_aes);
3697 if (err) {
3698 BT_ERR("smp_c1 test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003699 goto done;
Johan Hedbergcfc41982014-12-30 09:50:40 +02003700 }
3701
3702 err = test_s1(tfm_aes);
3703 if (err) {
3704 BT_ERR("smp_s1 test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003705 goto done;
Johan Hedbergcfc41982014-12-30 09:50:40 +02003706 }
3707
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003708 err = test_f4(tfm_cmac);
3709 if (err) {
3710 BT_ERR("smp_f4 test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003711 goto done;
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003712 }
3713
3714 err = test_f5(tfm_cmac);
3715 if (err) {
3716 BT_ERR("smp_f5 test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003717 goto done;
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003718 }
3719
3720 err = test_f6(tfm_cmac);
3721 if (err) {
3722 BT_ERR("smp_f6 test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003723 goto done;
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003724 }
3725
3726 err = test_g2(tfm_cmac);
3727 if (err) {
3728 BT_ERR("smp_g2 test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003729 goto done;
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003730 }
3731
3732 err = test_h6(tfm_cmac);
3733 if (err) {
3734 BT_ERR("smp_h6 test failed");
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003735 goto done;
Johan Hedbergfb2969a2014-12-30 09:50:41 +02003736 }
3737
Marcel Holtmann255047b2014-12-30 00:11:20 -08003738 rettime = ktime_get();
3739 delta = ktime_sub(rettime, calltime);
3740 duration = (unsigned long long) ktime_to_ns(delta) >> 10;
3741
Marcel Holtmann5ced2462015-01-12 23:09:48 -08003742 BT_INFO("SMP test passed in %llu usecs", duration);
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003743
Marcel Holtmann64dd3742015-04-01 12:52:13 -07003744done:
3745 if (!err)
3746 snprintf(test_smp_buffer, sizeof(test_smp_buffer),
3747 "PASS (%llu usecs)\n", duration);
3748 else
3749 snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n");
3750
3751 debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL,
3752 &test_smp_fops);
3753
3754 return err;
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003755}
3756
3757int __init bt_selftest_smp(void)
3758{
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003759 struct crypto_cipher *tfm_aes;
Herbert Xu71af2f62016-01-24 21:18:30 +08003760 struct crypto_shash *tfm_cmac;
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003761 int err;
3762
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003763 tfm_aes = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003764 if (IS_ERR(tfm_aes)) {
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003765 BT_ERR("Unable to create AES crypto context");
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003766 return PTR_ERR(tfm_aes);
3767 }
3768
Herbert Xu71af2f62016-01-24 21:18:30 +08003769 tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, CRYPTO_ALG_ASYNC);
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003770 if (IS_ERR(tfm_cmac)) {
3771 BT_ERR("Unable to create CMAC crypto context");
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003772 crypto_free_cipher(tfm_aes);
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003773 return PTR_ERR(tfm_cmac);
3774 }
3775
3776 err = run_selftests(tfm_aes, tfm_cmac);
3777
Herbert Xu71af2f62016-01-24 21:18:30 +08003778 crypto_free_shash(tfm_cmac);
Andy Lutomirskia4770e12016-06-26 14:55:23 -07003779 crypto_free_cipher(tfm_aes);
Johan Hedberg0a2b0f02014-12-30 09:50:39 +02003780
3781 return err;
3782}
3783
3784#endif