Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 1 | /* |
| 2 | BlueZ - Bluetooth protocol stack for Linux |
| 3 | Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License version 2 as |
| 7 | published by the Free Software Foundation; |
| 8 | |
| 9 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 10 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 11 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. |
| 12 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY |
| 13 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES |
| 14 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | |
| 18 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
| 19 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS |
| 20 | SOFTWARE IS DISCLAIMED. |
| 21 | */ |
| 22 | |
| 23 | #include <net/bluetooth/bluetooth.h> |
| 24 | #include <net/bluetooth/hci_core.h> |
| 25 | #include <net/bluetooth/l2cap.h> |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 26 | #include <net/bluetooth/mgmt.h> |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 27 | #include <net/bluetooth/smp.h> |
Anderson Briglia | d22ef0b | 2011-06-09 18:50:44 -0300 | [diff] [blame] | 28 | #include <linux/crypto.h> |
Stephen Rothwell | f70490e | 2011-06-23 12:58:55 +1000 | [diff] [blame] | 29 | #include <linux/scatterlist.h> |
Anderson Briglia | d22ef0b | 2011-06-09 18:50:44 -0300 | [diff] [blame] | 30 | #include <crypto/b128ops.h> |
| 31 | |
Vinicius Costa Gomes | 5d3de7d | 2011-06-14 13:37:41 -0300 | [diff] [blame] | 32 | #define SMP_TIMEOUT 30000 /* 30 seconds */ |
| 33 | |
Anderson Briglia | d22ef0b | 2011-06-09 18:50:44 -0300 | [diff] [blame] | 34 | static inline void swap128(u8 src[16], u8 dst[16]) |
| 35 | { |
| 36 | int i; |
| 37 | for (i = 0; i < 16; i++) |
| 38 | dst[15 - i] = src[i]; |
| 39 | } |
| 40 | |
| 41 | static inline void swap56(u8 src[7], u8 dst[7]) |
| 42 | { |
| 43 | int i; |
| 44 | for (i = 0; i < 7; i++) |
| 45 | dst[6 - i] = src[i]; |
| 46 | } |
| 47 | |
| 48 | static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r) |
| 49 | { |
| 50 | struct blkcipher_desc desc; |
| 51 | struct scatterlist sg; |
| 52 | int err, iv_len; |
| 53 | unsigned char iv[128]; |
| 54 | |
| 55 | if (tfm == NULL) { |
| 56 | BT_ERR("tfm %p", tfm); |
| 57 | return -EINVAL; |
| 58 | } |
| 59 | |
| 60 | desc.tfm = tfm; |
| 61 | desc.flags = 0; |
| 62 | |
| 63 | err = crypto_blkcipher_setkey(tfm, k, 16); |
| 64 | if (err) { |
| 65 | BT_ERR("cipher setkey failed: %d", err); |
| 66 | return err; |
| 67 | } |
| 68 | |
| 69 | sg_init_one(&sg, r, 16); |
| 70 | |
| 71 | iv_len = crypto_blkcipher_ivsize(tfm); |
| 72 | if (iv_len) { |
| 73 | memset(&iv, 0xff, iv_len); |
| 74 | crypto_blkcipher_set_iv(tfm, iv, iv_len); |
| 75 | } |
| 76 | |
| 77 | err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16); |
| 78 | if (err) |
| 79 | BT_ERR("Encrypt data error %d", err); |
| 80 | |
| 81 | return err; |
| 82 | } |
| 83 | |
| 84 | static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16], |
| 85 | u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia, |
| 86 | u8 _rat, bdaddr_t *ra, u8 res[16]) |
| 87 | { |
| 88 | u8 p1[16], p2[16]; |
| 89 | int err; |
| 90 | |
| 91 | memset(p1, 0, 16); |
| 92 | |
| 93 | /* p1 = pres || preq || _rat || _iat */ |
| 94 | swap56(pres, p1); |
| 95 | swap56(preq, p1 + 7); |
| 96 | p1[14] = _rat; |
| 97 | p1[15] = _iat; |
| 98 | |
| 99 | memset(p2, 0, 16); |
| 100 | |
| 101 | /* p2 = padding || ia || ra */ |
| 102 | baswap((bdaddr_t *) (p2 + 4), ia); |
| 103 | baswap((bdaddr_t *) (p2 + 10), ra); |
| 104 | |
| 105 | /* res = r XOR p1 */ |
| 106 | u128_xor((u128 *) res, (u128 *) r, (u128 *) p1); |
| 107 | |
| 108 | /* res = e(k, res) */ |
| 109 | err = smp_e(tfm, k, res); |
| 110 | if (err) { |
| 111 | BT_ERR("Encrypt data error"); |
| 112 | return err; |
| 113 | } |
| 114 | |
| 115 | /* res = res XOR p2 */ |
| 116 | u128_xor((u128 *) res, (u128 *) res, (u128 *) p2); |
| 117 | |
| 118 | /* res = e(k, res) */ |
| 119 | err = smp_e(tfm, k, res); |
| 120 | if (err) |
| 121 | BT_ERR("Encrypt data error"); |
| 122 | |
| 123 | return err; |
| 124 | } |
| 125 | |
| 126 | static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16], |
| 127 | u8 r1[16], u8 r2[16], u8 _r[16]) |
| 128 | { |
| 129 | int err; |
| 130 | |
| 131 | /* Just least significant octets from r1 and r2 are considered */ |
| 132 | memcpy(_r, r1 + 8, 8); |
| 133 | memcpy(_r + 8, r2 + 8, 8); |
| 134 | |
| 135 | err = smp_e(tfm, k, _r); |
| 136 | if (err) |
| 137 | BT_ERR("Encrypt data error"); |
| 138 | |
| 139 | return err; |
| 140 | } |
| 141 | |
| 142 | static int smp_rand(u8 *buf) |
| 143 | { |
| 144 | get_random_bytes(buf, 16); |
| 145 | |
| 146 | return 0; |
| 147 | } |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 148 | |
| 149 | static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code, |
| 150 | u16 dlen, void *data) |
| 151 | { |
| 152 | struct sk_buff *skb; |
| 153 | struct l2cap_hdr *lh; |
| 154 | int len; |
| 155 | |
| 156 | len = L2CAP_HDR_SIZE + sizeof(code) + dlen; |
| 157 | |
| 158 | if (len > conn->mtu) |
| 159 | return NULL; |
| 160 | |
| 161 | skb = bt_skb_alloc(len, GFP_ATOMIC); |
| 162 | if (!skb) |
| 163 | return NULL; |
| 164 | |
| 165 | lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); |
| 166 | lh->len = cpu_to_le16(sizeof(code) + dlen); |
| 167 | lh->cid = cpu_to_le16(L2CAP_CID_SMP); |
| 168 | |
| 169 | memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code)); |
| 170 | |
| 171 | memcpy(skb_put(skb, dlen), data, dlen); |
| 172 | |
| 173 | return skb; |
| 174 | } |
| 175 | |
| 176 | static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data) |
| 177 | { |
| 178 | struct sk_buff *skb = smp_build_cmd(conn, code, len, data); |
| 179 | |
| 180 | BT_DBG("code 0x%2.2x", code); |
| 181 | |
| 182 | if (!skb) |
| 183 | return; |
| 184 | |
Luiz Augusto von Dentz | 73d80de | 2011-11-02 15:52:01 +0200 | [diff] [blame] | 185 | skb->priority = HCI_PRIO_MAX; |
| 186 | hci_send_acl(conn->hchan, skb, 0); |
Vinicius Costa Gomes | e2dcd11 | 2011-08-19 21:06:50 -0300 | [diff] [blame] | 187 | |
Gustavo F. Padovan | 6c9d42a | 2011-12-20 10:57:27 -0200 | [diff] [blame] | 188 | cancel_delayed_work_sync(&conn->security_timer); |
| 189 | schedule_delayed_work(&conn->security_timer, |
Vinicius Costa Gomes | e2dcd11 | 2011-08-19 21:06:50 -0300 | [diff] [blame] | 190 | msecs_to_jiffies(SMP_TIMEOUT)); |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 191 | } |
| 192 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 193 | static __u8 authreq_to_seclevel(__u8 authreq) |
| 194 | { |
| 195 | if (authreq & SMP_AUTH_MITM) |
| 196 | return BT_SECURITY_HIGH; |
| 197 | else |
| 198 | return BT_SECURITY_MEDIUM; |
| 199 | } |
| 200 | |
| 201 | static __u8 seclevel_to_authreq(__u8 sec_level) |
| 202 | { |
| 203 | switch (sec_level) { |
| 204 | case BT_SECURITY_HIGH: |
| 205 | return SMP_AUTH_MITM | SMP_AUTH_BONDING; |
| 206 | case BT_SECURITY_MEDIUM: |
| 207 | return SMP_AUTH_BONDING; |
| 208 | default: |
| 209 | return SMP_AUTH_NONE; |
| 210 | } |
| 211 | } |
| 212 | |
Vinicius Costa Gomes | b8e66ea | 2011-06-09 18:50:52 -0300 | [diff] [blame] | 213 | static void build_pairing_cmd(struct l2cap_conn *conn, |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 214 | struct smp_cmd_pairing *req, |
| 215 | struct smp_cmd_pairing *rsp, |
| 216 | __u8 authreq) |
Vinicius Costa Gomes | b8e66ea | 2011-06-09 18:50:52 -0300 | [diff] [blame] | 217 | { |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 218 | u8 dist_keys = 0; |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 219 | |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 220 | if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->flags)) { |
Vinicius Costa Gomes | ca10b5e | 2011-08-25 20:02:37 -0300 | [diff] [blame] | 221 | dist_keys = SMP_DIST_ENC_KEY; |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 222 | authreq |= SMP_AUTH_BONDING; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 223 | } else { |
| 224 | authreq &= ~SMP_AUTH_BONDING; |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | if (rsp == NULL) { |
| 228 | req->io_capability = conn->hcon->io_capability; |
| 229 | req->oob_flag = SMP_OOB_NOT_PRESENT; |
| 230 | req->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 231 | req->init_key_dist = 0; |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 232 | req->resp_key_dist = dist_keys; |
| 233 | req->auth_req = authreq; |
| 234 | return; |
| 235 | } |
| 236 | |
| 237 | rsp->io_capability = conn->hcon->io_capability; |
| 238 | rsp->oob_flag = SMP_OOB_NOT_PRESENT; |
| 239 | rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 240 | rsp->init_key_dist = 0; |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 241 | rsp->resp_key_dist = req->resp_key_dist & dist_keys; |
| 242 | rsp->auth_req = authreq; |
Vinicius Costa Gomes | b8e66ea | 2011-06-09 18:50:52 -0300 | [diff] [blame] | 243 | } |
| 244 | |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 245 | static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size) |
| 246 | { |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 247 | struct smp_chan *smp = conn->smp_chan; |
| 248 | |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 249 | if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) || |
| 250 | (max_key_size < SMP_MIN_ENC_KEY_SIZE)) |
| 251 | return SMP_ENC_KEY_SIZE; |
| 252 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 253 | smp->smp_key_size = max_key_size; |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | |
Brian Gix | 4f957a7 | 2011-11-23 08:28:36 -0800 | [diff] [blame] | 258 | static void smp_failure(struct l2cap_conn *conn, u8 reason, u8 send) |
| 259 | { |
| 260 | if (send) |
| 261 | smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), |
| 262 | &reason); |
| 263 | |
| 264 | clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->hcon->pend); |
| 265 | mgmt_auth_failed(conn->hcon->hdev, conn->dst, reason); |
Gustavo F. Padovan | 6c9d42a | 2011-12-20 10:57:27 -0200 | [diff] [blame] | 266 | cancel_delayed_work_sync(&conn->security_timer); |
Brian Gix | 4f957a7 | 2011-11-23 08:28:36 -0800 | [diff] [blame] | 267 | smp_chan_destroy(conn); |
| 268 | } |
| 269 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 270 | #define JUST_WORKS 0x00 |
| 271 | #define JUST_CFM 0x01 |
| 272 | #define REQ_PASSKEY 0x02 |
| 273 | #define CFM_PASSKEY 0x03 |
| 274 | #define REQ_OOB 0x04 |
| 275 | #define OVERLAP 0xFF |
| 276 | |
| 277 | static const u8 gen_method[5][5] = { |
| 278 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, |
| 279 | { JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY }, |
| 280 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY }, |
| 281 | { JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM }, |
| 282 | { CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP }, |
| 283 | }; |
| 284 | |
| 285 | static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth, |
| 286 | u8 local_io, u8 remote_io) |
| 287 | { |
| 288 | struct hci_conn *hcon = conn->hcon; |
| 289 | struct smp_chan *smp = conn->smp_chan; |
| 290 | u8 method; |
| 291 | u32 passkey = 0; |
| 292 | int ret = 0; |
| 293 | |
| 294 | /* Initialize key for JUST WORKS */ |
| 295 | memset(smp->tk, 0, sizeof(smp->tk)); |
| 296 | clear_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); |
| 297 | |
| 298 | BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io); |
| 299 | |
| 300 | /* If neither side wants MITM, use JUST WORKS */ |
| 301 | /* If either side has unknown io_caps, use JUST WORKS */ |
| 302 | /* Otherwise, look up method from the table */ |
| 303 | if (!(auth & SMP_AUTH_MITM) || |
| 304 | local_io > SMP_IO_KEYBOARD_DISPLAY || |
| 305 | remote_io > SMP_IO_KEYBOARD_DISPLAY) |
| 306 | method = JUST_WORKS; |
| 307 | else |
| 308 | method = gen_method[local_io][remote_io]; |
| 309 | |
| 310 | /* If not bonding, don't ask user to confirm a Zero TK */ |
| 311 | if (!(auth & SMP_AUTH_BONDING) && method == JUST_CFM) |
| 312 | method = JUST_WORKS; |
| 313 | |
| 314 | /* If Just Works, Continue with Zero TK */ |
| 315 | if (method == JUST_WORKS) { |
| 316 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | /* Not Just Works/Confirm results in MITM Authentication */ |
| 321 | if (method != JUST_CFM) |
| 322 | set_bit(SMP_FLAG_MITM_AUTH, &smp->smp_flags); |
| 323 | |
| 324 | /* If both devices have Keyoard-Display I/O, the master |
| 325 | * Confirms and the slave Enters the passkey. |
| 326 | */ |
| 327 | if (method == OVERLAP) { |
| 328 | if (hcon->link_mode & HCI_LM_MASTER) |
| 329 | method = CFM_PASSKEY; |
| 330 | else |
| 331 | method = REQ_PASSKEY; |
| 332 | } |
| 333 | |
| 334 | /* Generate random passkey. Not valid until confirmed. */ |
| 335 | if (method == CFM_PASSKEY) { |
| 336 | u8 key[16]; |
| 337 | |
| 338 | memset(key, 0, sizeof(key)); |
| 339 | get_random_bytes(&passkey, sizeof(passkey)); |
| 340 | passkey %= 1000000; |
| 341 | put_unaligned_le32(passkey, key); |
| 342 | swap128(key, smp->tk); |
| 343 | BT_DBG("PassKey: %d", passkey); |
| 344 | } |
| 345 | |
| 346 | hci_dev_lock(hcon->hdev); |
| 347 | |
| 348 | if (method == REQ_PASSKEY) |
| 349 | ret = mgmt_user_passkey_request(hcon->hdev, conn->dst); |
| 350 | else |
| 351 | ret = mgmt_user_confirm_request(hcon->hdev, conn->dst, |
| 352 | cpu_to_le32(passkey), 0); |
| 353 | |
| 354 | hci_dev_unlock(hcon->hdev); |
| 355 | |
| 356 | return ret; |
| 357 | } |
| 358 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 359 | static void confirm_work(struct work_struct *work) |
| 360 | { |
| 361 | struct smp_chan *smp = container_of(work, struct smp_chan, confirm); |
| 362 | struct l2cap_conn *conn = smp->conn; |
| 363 | struct crypto_blkcipher *tfm; |
| 364 | struct smp_cmd_pairing_confirm cp; |
| 365 | int ret; |
| 366 | u8 res[16], reason; |
| 367 | |
| 368 | BT_DBG("conn %p", conn); |
| 369 | |
| 370 | tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC); |
| 371 | if (IS_ERR(tfm)) { |
| 372 | reason = SMP_UNSPECIFIED; |
| 373 | goto error; |
| 374 | } |
| 375 | |
| 376 | smp->tfm = tfm; |
| 377 | |
| 378 | if (conn->hcon->out) |
| 379 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0, |
| 380 | conn->src, conn->hcon->dst_type, conn->dst, |
| 381 | res); |
| 382 | else |
| 383 | ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, |
| 384 | conn->hcon->dst_type, conn->dst, 0, conn->src, |
| 385 | res); |
| 386 | if (ret) { |
| 387 | reason = SMP_UNSPECIFIED; |
| 388 | goto error; |
| 389 | } |
| 390 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 391 | clear_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); |
| 392 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 393 | swap128(res, cp.confirm_val); |
| 394 | smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp); |
| 395 | |
| 396 | return; |
| 397 | |
| 398 | error: |
Brian Gix | 4f957a7 | 2011-11-23 08:28:36 -0800 | [diff] [blame] | 399 | smp_failure(conn, reason, 1); |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | static void random_work(struct work_struct *work) |
| 403 | { |
| 404 | struct smp_chan *smp = container_of(work, struct smp_chan, random); |
| 405 | struct l2cap_conn *conn = smp->conn; |
| 406 | struct hci_conn *hcon = conn->hcon; |
| 407 | struct crypto_blkcipher *tfm = smp->tfm; |
| 408 | u8 reason, confirm[16], res[16], key[16]; |
| 409 | int ret; |
| 410 | |
| 411 | if (IS_ERR_OR_NULL(tfm)) { |
| 412 | reason = SMP_UNSPECIFIED; |
| 413 | goto error; |
| 414 | } |
| 415 | |
| 416 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
| 417 | |
| 418 | if (hcon->out) |
| 419 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0, |
| 420 | conn->src, hcon->dst_type, conn->dst, |
| 421 | res); |
| 422 | else |
| 423 | ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, |
| 424 | hcon->dst_type, conn->dst, 0, conn->src, |
| 425 | res); |
| 426 | if (ret) { |
| 427 | reason = SMP_UNSPECIFIED; |
| 428 | goto error; |
| 429 | } |
| 430 | |
| 431 | swap128(res, confirm); |
| 432 | |
| 433 | if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) { |
| 434 | BT_ERR("Pairing failed (confirmation values mismatch)"); |
| 435 | reason = SMP_CONFIRM_FAILED; |
| 436 | goto error; |
| 437 | } |
| 438 | |
| 439 | if (hcon->out) { |
| 440 | u8 stk[16], rand[8]; |
| 441 | __le16 ediv; |
| 442 | |
| 443 | memset(rand, 0, sizeof(rand)); |
| 444 | ediv = 0; |
| 445 | |
| 446 | smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key); |
| 447 | swap128(key, stk); |
| 448 | |
| 449 | memset(stk + smp->smp_key_size, 0, |
| 450 | SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size); |
| 451 | |
| 452 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend)) { |
| 453 | reason = SMP_UNSPECIFIED; |
| 454 | goto error; |
| 455 | } |
| 456 | |
| 457 | hci_le_start_enc(hcon, ediv, rand, stk); |
| 458 | hcon->enc_key_size = smp->smp_key_size; |
| 459 | } else { |
| 460 | u8 stk[16], r[16], rand[8]; |
| 461 | __le16 ediv; |
| 462 | |
| 463 | memset(rand, 0, sizeof(rand)); |
| 464 | ediv = 0; |
| 465 | |
| 466 | swap128(smp->prnd, r); |
| 467 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r); |
| 468 | |
| 469 | smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key); |
| 470 | swap128(key, stk); |
| 471 | |
| 472 | memset(stk + smp->smp_key_size, 0, |
| 473 | SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size); |
| 474 | |
| 475 | hci_add_ltk(hcon->hdev, 0, conn->dst, smp->smp_key_size, |
| 476 | ediv, rand, stk); |
| 477 | } |
| 478 | |
| 479 | return; |
| 480 | |
| 481 | error: |
Brian Gix | 4f957a7 | 2011-11-23 08:28:36 -0800 | [diff] [blame] | 482 | smp_failure(conn, reason, 1); |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | static struct smp_chan *smp_chan_create(struct l2cap_conn *conn) |
| 486 | { |
| 487 | struct smp_chan *smp; |
| 488 | |
| 489 | smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC); |
| 490 | if (!smp) |
| 491 | return NULL; |
| 492 | |
| 493 | INIT_WORK(&smp->confirm, confirm_work); |
| 494 | INIT_WORK(&smp->random, random_work); |
| 495 | |
| 496 | smp->conn = conn; |
| 497 | conn->smp_chan = smp; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 498 | conn->hcon->smp_conn = conn; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 499 | |
| 500 | hci_conn_hold(conn->hcon); |
| 501 | |
| 502 | return smp; |
| 503 | } |
| 504 | |
| 505 | void smp_chan_destroy(struct l2cap_conn *conn) |
| 506 | { |
Brian Gix | c8eb969 | 2011-11-23 08:28:35 -0800 | [diff] [blame] | 507 | struct smp_chan *smp = conn->smp_chan; |
| 508 | |
| 509 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend); |
| 510 | |
| 511 | if (smp->tfm) |
| 512 | crypto_free_blkcipher(smp->tfm); |
| 513 | |
| 514 | kfree(smp); |
| 515 | conn->smp_chan = NULL; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 516 | conn->hcon->smp_conn = NULL; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 517 | hci_conn_put(conn->hcon); |
| 518 | } |
| 519 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 520 | int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey) |
| 521 | { |
| 522 | struct l2cap_conn *conn = hcon->smp_conn; |
| 523 | struct smp_chan *smp; |
| 524 | u32 value; |
| 525 | u8 key[16]; |
| 526 | |
| 527 | BT_DBG(""); |
| 528 | |
| 529 | if (!conn) |
| 530 | return -ENOTCONN; |
| 531 | |
| 532 | smp = conn->smp_chan; |
| 533 | |
| 534 | switch (mgmt_op) { |
| 535 | case MGMT_OP_USER_PASSKEY_REPLY: |
| 536 | value = le32_to_cpu(passkey); |
| 537 | memset(key, 0, sizeof(key)); |
| 538 | BT_DBG("PassKey: %d", value); |
| 539 | put_unaligned_le32(value, key); |
| 540 | swap128(key, smp->tk); |
| 541 | /* Fall Through */ |
| 542 | case MGMT_OP_USER_CONFIRM_REPLY: |
| 543 | set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags); |
| 544 | break; |
| 545 | case MGMT_OP_USER_PASSKEY_NEG_REPLY: |
| 546 | case MGMT_OP_USER_CONFIRM_NEG_REPLY: |
| 547 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); |
| 548 | return 0; |
| 549 | default: |
| 550 | smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1); |
| 551 | return -EOPNOTSUPP; |
| 552 | } |
| 553 | |
| 554 | /* If it is our turn to send Pairing Confirm, do so now */ |
| 555 | if (test_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags)) |
| 556 | queue_work(hcon->hdev->workqueue, &smp->confirm); |
| 557 | |
| 558 | return 0; |
| 559 | } |
| 560 | |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 561 | static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb) |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 562 | { |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 563 | struct smp_cmd_pairing rsp, *req = (void *) skb->data; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 564 | struct smp_chan *smp; |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 565 | u8 key_size; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 566 | u8 auth = SMP_AUTH_NONE; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 567 | int ret; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 568 | |
| 569 | BT_DBG("conn %p", conn); |
| 570 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 571 | if (conn->hcon->link_mode & HCI_LM_MASTER) |
| 572 | return SMP_CMD_NOTSUPP; |
| 573 | |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 574 | if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend)) |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 575 | smp = smp_chan_create(conn); |
| 576 | |
| 577 | smp = conn->smp_chan; |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 578 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 579 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
| 580 | memcpy(&smp->preq[1], req, sizeof(*req)); |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 581 | skb_pull(skb, sizeof(*req)); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 582 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 583 | /* We didn't start the pairing, so match remote */ |
| 584 | if (req->auth_req & SMP_AUTH_BONDING) |
| 585 | auth = req->auth_req; |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 586 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 587 | build_pairing_cmd(conn, req, &rsp, auth); |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 588 | |
| 589 | key_size = min(req->max_key_size, rsp.max_key_size); |
| 590 | if (check_enc_key_size(conn, key_size)) |
| 591 | return SMP_ENC_KEY_SIZE; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 592 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 593 | ret = smp_rand(smp->prnd); |
| 594 | if (ret) |
| 595 | return SMP_UNSPECIFIED; |
| 596 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 597 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
| 598 | memcpy(&smp->prsp[1], &rsp, sizeof(rsp)); |
Anderson Briglia | f01ead3 | 2011-06-09 18:50:45 -0300 | [diff] [blame] | 599 | |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 600 | smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp); |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 601 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 602 | /* Request setup of TK */ |
| 603 | ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability); |
| 604 | if (ret) |
| 605 | return SMP_UNSPECIFIED; |
| 606 | |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 607 | return 0; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 608 | } |
| 609 | |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 610 | static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb) |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 611 | { |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 612 | struct smp_cmd_pairing *req, *rsp = (void *) skb->data; |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 613 | struct smp_chan *smp = conn->smp_chan; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 614 | struct hci_dev *hdev = conn->hcon->hdev; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 615 | u8 key_size, auth = SMP_AUTH_NONE; |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 616 | int ret; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 617 | |
| 618 | BT_DBG("conn %p", conn); |
| 619 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 620 | if (!(conn->hcon->link_mode & HCI_LM_MASTER)) |
| 621 | return SMP_CMD_NOTSUPP; |
| 622 | |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 623 | skb_pull(skb, sizeof(*rsp)); |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 624 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 625 | req = (void *) &smp->preq[1]; |
Vinicius Costa Gomes | 3158c50 | 2011-06-14 13:37:42 -0300 | [diff] [blame] | 626 | |
| 627 | key_size = min(req->max_key_size, rsp->max_key_size); |
| 628 | if (check_enc_key_size(conn, key_size)) |
| 629 | return SMP_ENC_KEY_SIZE; |
| 630 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 631 | ret = smp_rand(smp->prnd); |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 632 | if (ret) |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 633 | return SMP_UNSPECIFIED; |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 634 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 635 | smp->prsp[0] = SMP_CMD_PAIRING_RSP; |
| 636 | memcpy(&smp->prsp[1], rsp, sizeof(*rsp)); |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 637 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 638 | if ((req->auth_req & SMP_AUTH_BONDING) && |
| 639 | (rsp->auth_req & SMP_AUTH_BONDING)) |
| 640 | auth = SMP_AUTH_BONDING; |
| 641 | |
| 642 | auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM; |
| 643 | |
| 644 | ret = tk_request(conn, 0, auth, rsp->io_capability, req->io_capability); |
| 645 | if (ret) |
| 646 | return SMP_UNSPECIFIED; |
| 647 | |
| 648 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); |
| 649 | |
| 650 | /* Can't compose response until we have been confirmed */ |
| 651 | if (!test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) |
| 652 | return 0; |
| 653 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 654 | queue_work(hdev->workqueue, &smp->confirm); |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 655 | |
| 656 | return 0; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 657 | } |
| 658 | |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 659 | static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb) |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 660 | { |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 661 | struct smp_chan *smp = conn->smp_chan; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 662 | struct hci_dev *hdev = conn->hcon->hdev; |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 663 | |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 664 | BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave"); |
| 665 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 666 | memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf)); |
| 667 | skb_pull(skb, sizeof(smp->pcnf)); |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 668 | |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 669 | if (conn->hcon->out) { |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 670 | u8 random[16]; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 671 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 672 | swap128(smp->prnd, random); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 673 | smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random), |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 674 | random); |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 675 | } else if (test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) { |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 676 | queue_work(hdev->workqueue, &smp->confirm); |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 677 | } else { |
| 678 | set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 679 | } |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 680 | |
| 681 | return 0; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 682 | } |
| 683 | |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 684 | static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb) |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 685 | { |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 686 | struct smp_chan *smp = conn->smp_chan; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 687 | struct hci_dev *hdev = conn->hcon->hdev; |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 688 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 689 | BT_DBG("conn %p", conn); |
Anderson Briglia | 7d24ddc | 2011-06-09 18:50:46 -0300 | [diff] [blame] | 690 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 691 | swap128(skb->data, smp->rrnd); |
| 692 | skb_pull(skb, sizeof(smp->rrnd)); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 693 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 694 | queue_work(hdev->workqueue, &smp->random); |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 695 | |
| 696 | return 0; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 697 | } |
| 698 | |
Vinicius Costa Gomes | 988c599 | 2011-08-25 20:02:28 -0300 | [diff] [blame] | 699 | static u8 smp_ltk_encrypt(struct l2cap_conn *conn) |
| 700 | { |
| 701 | struct link_key *key; |
| 702 | struct key_master_id *master; |
| 703 | struct hci_conn *hcon = conn->hcon; |
| 704 | |
| 705 | key = hci_find_link_key_type(hcon->hdev, conn->dst, |
| 706 | HCI_LK_SMP_LTK); |
| 707 | if (!key) |
| 708 | return 0; |
| 709 | |
| 710 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, |
| 711 | &hcon->pend)) |
| 712 | return 1; |
| 713 | |
| 714 | master = (void *) key->data; |
| 715 | hci_le_start_enc(hcon, master->ediv, master->rand, |
| 716 | key->val); |
| 717 | hcon->enc_key_size = key->pin_len; |
| 718 | |
| 719 | return 1; |
| 720 | |
| 721 | } |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 722 | static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb) |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 723 | { |
| 724 | struct smp_cmd_security_req *rp = (void *) skb->data; |
| 725 | struct smp_cmd_pairing cp; |
Vinicius Costa Gomes | f1cb9af | 2011-01-26 21:42:57 -0300 | [diff] [blame] | 726 | struct hci_conn *hcon = conn->hcon; |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 727 | struct smp_chan *smp; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 728 | |
| 729 | BT_DBG("conn %p", conn); |
| 730 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 731 | hcon->pending_sec_level = authreq_to_seclevel(rp->auth_req); |
Vinicius Costa Gomes | feb45eb | 2011-08-25 20:02:35 -0300 | [diff] [blame] | 732 | |
Vinicius Costa Gomes | 988c599 | 2011-08-25 20:02:28 -0300 | [diff] [blame] | 733 | if (smp_ltk_encrypt(conn)) |
| 734 | return 0; |
| 735 | |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 736 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 737 | return 0; |
Vinicius Costa Gomes | f1cb9af | 2011-01-26 21:42:57 -0300 | [diff] [blame] | 738 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 739 | smp = smp_chan_create(conn); |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 740 | |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 741 | skb_pull(skb, sizeof(*rp)); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 742 | |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 743 | memset(&cp, 0, sizeof(cp)); |
Vinicius Costa Gomes | 54790f7 | 2011-07-07 18:59:38 -0300 | [diff] [blame] | 744 | build_pairing_cmd(conn, &cp, NULL, rp->auth_req); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 745 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 746 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
| 747 | memcpy(&smp->preq[1], &cp, sizeof(cp)); |
Anderson Briglia | f01ead3 | 2011-06-09 18:50:45 -0300 | [diff] [blame] | 748 | |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 749 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
Vinicius Costa Gomes | f1cb9af | 2011-01-26 21:42:57 -0300 | [diff] [blame] | 750 | |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 751 | return 0; |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 752 | } |
| 753 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 754 | int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level) |
| 755 | { |
Vinicius Costa Gomes | 3a0259b | 2011-06-09 18:50:43 -0300 | [diff] [blame] | 756 | struct hci_conn *hcon = conn->hcon; |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 757 | struct smp_chan *smp = conn->smp_chan; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 758 | __u8 authreq; |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 759 | |
Vinicius Costa Gomes | 3a0259b | 2011-06-09 18:50:43 -0300 | [diff] [blame] | 760 | BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level); |
| 761 | |
Andre Guedes | 2e65c9d | 2011-06-30 19:20:56 -0300 | [diff] [blame] | 762 | if (!lmp_host_le_capable(hcon->hdev)) |
| 763 | return 1; |
| 764 | |
Vinicius Costa Gomes | f1cb9af | 2011-01-26 21:42:57 -0300 | [diff] [blame] | 765 | if (sec_level == BT_SECURITY_LOW) |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 766 | return 1; |
Vinicius Costa Gomes | f1cb9af | 2011-01-26 21:42:57 -0300 | [diff] [blame] | 767 | |
| 768 | if (hcon->sec_level >= sec_level) |
| 769 | return 1; |
| 770 | |
Vinicius Costa Gomes | 988c599 | 2011-08-25 20:02:28 -0300 | [diff] [blame] | 771 | if (hcon->link_mode & HCI_LM_MASTER) |
| 772 | if (smp_ltk_encrypt(conn)) |
Vinicius Costa Gomes | 02bc745 | 2011-07-07 18:59:41 -0300 | [diff] [blame] | 773 | goto done; |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 774 | |
| 775 | if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) |
| 776 | return 0; |
| 777 | |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 778 | smp = smp_chan_create(conn); |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 779 | if (!smp) |
| 780 | return 1; |
| 781 | |
| 782 | authreq = seclevel_to_authreq(sec_level); |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 783 | |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 784 | if (hcon->link_mode & HCI_LM_MASTER) { |
| 785 | struct smp_cmd_pairing cp; |
Anderson Briglia | f01ead3 | 2011-06-09 18:50:45 -0300 | [diff] [blame] | 786 | |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 787 | build_pairing_cmd(conn, &cp, NULL, authreq); |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 788 | smp->preq[0] = SMP_CMD_PAIRING_REQ; |
| 789 | memcpy(&smp->preq[1], &cp, sizeof(cp)); |
Anderson Briglia | f01ead3 | 2011-06-09 18:50:45 -0300 | [diff] [blame] | 790 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 791 | smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp); |
| 792 | } else { |
| 793 | struct smp_cmd_security_req cp; |
Brian Gix | 2b64d15 | 2011-12-21 16:12:12 -0800 | [diff] [blame] | 794 | cp.auth_req = authreq; |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 795 | smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp); |
| 796 | } |
| 797 | |
Vinicius Costa Gomes | 02bc745 | 2011-07-07 18:59:41 -0300 | [diff] [blame] | 798 | done: |
Vinicius Costa Gomes | f1cb9af | 2011-01-26 21:42:57 -0300 | [diff] [blame] | 799 | hcon->pending_sec_level = sec_level; |
Vinicius Costa Gomes | f1cb9af | 2011-01-26 21:42:57 -0300 | [diff] [blame] | 800 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 801 | return 0; |
| 802 | } |
| 803 | |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 804 | static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb) |
| 805 | { |
Vinicius Costa Gomes | 16b9083 | 2011-07-07 18:59:39 -0300 | [diff] [blame] | 806 | struct smp_cmd_encrypt_info *rp = (void *) skb->data; |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 807 | struct smp_chan *smp = conn->smp_chan; |
Vinicius Costa Gomes | 16b9083 | 2011-07-07 18:59:39 -0300 | [diff] [blame] | 808 | |
| 809 | skb_pull(skb, sizeof(*rp)); |
| 810 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 811 | memcpy(smp->tk, rp->ltk, sizeof(smp->tk)); |
Vinicius Costa Gomes | 16b9083 | 2011-07-07 18:59:39 -0300 | [diff] [blame] | 812 | |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb) |
| 817 | { |
Vinicius Costa Gomes | 16b9083 | 2011-07-07 18:59:39 -0300 | [diff] [blame] | 818 | struct smp_cmd_master_ident *rp = (void *) skb->data; |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 819 | struct smp_chan *smp = conn->smp_chan; |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 820 | |
Vinicius Costa Gomes | 16b9083 | 2011-07-07 18:59:39 -0300 | [diff] [blame] | 821 | skb_pull(skb, sizeof(*rp)); |
| 822 | |
Hemant Gupta | 3573b80 | 2011-12-23 11:07:24 +0530 | [diff] [blame] | 823 | hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size, |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 824 | rp->ediv, rp->rand, smp->tk); |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 825 | |
| 826 | smp_distribute_keys(conn, 1); |
| 827 | |
| 828 | return 0; |
| 829 | } |
| 830 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 831 | int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) |
| 832 | { |
| 833 | __u8 code = skb->data[0]; |
| 834 | __u8 reason; |
| 835 | int err = 0; |
| 836 | |
Andre Guedes | 2e65c9d | 2011-06-30 19:20:56 -0300 | [diff] [blame] | 837 | if (!lmp_host_le_capable(conn->hcon->hdev)) { |
| 838 | err = -ENOTSUPP; |
| 839 | reason = SMP_PAIRING_NOTSUPP; |
| 840 | goto done; |
| 841 | } |
| 842 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 843 | skb_pull(skb, sizeof(code)); |
| 844 | |
| 845 | switch (code) { |
| 846 | case SMP_CMD_PAIRING_REQ: |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 847 | reason = smp_cmd_pairing_req(conn, skb); |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 848 | break; |
| 849 | |
| 850 | case SMP_CMD_PAIRING_FAIL: |
Brian Gix | 4f957a7 | 2011-11-23 08:28:36 -0800 | [diff] [blame] | 851 | smp_failure(conn, skb->data[0], 0); |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 852 | reason = 0; |
| 853 | err = -EPERM; |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 854 | break; |
| 855 | |
| 856 | case SMP_CMD_PAIRING_RSP: |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 857 | reason = smp_cmd_pairing_rsp(conn, skb); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 858 | break; |
| 859 | |
| 860 | case SMP_CMD_SECURITY_REQ: |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 861 | reason = smp_cmd_security_req(conn, skb); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 862 | break; |
| 863 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 864 | case SMP_CMD_PAIRING_CONFIRM: |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 865 | reason = smp_cmd_pairing_confirm(conn, skb); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 866 | break; |
| 867 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 868 | case SMP_CMD_PAIRING_RANDOM: |
Vinicius Costa Gomes | da85e5e | 2011-06-09 18:50:53 -0300 | [diff] [blame] | 869 | reason = smp_cmd_pairing_random(conn, skb); |
Anderson Briglia | 88ba43b | 2011-06-09 18:50:42 -0300 | [diff] [blame] | 870 | break; |
| 871 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 872 | case SMP_CMD_ENCRYPT_INFO: |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 873 | reason = smp_cmd_encrypt_info(conn, skb); |
| 874 | break; |
| 875 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 876 | case SMP_CMD_MASTER_IDENT: |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 877 | reason = smp_cmd_master_ident(conn, skb); |
| 878 | break; |
| 879 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 880 | case SMP_CMD_IDENT_INFO: |
| 881 | case SMP_CMD_IDENT_ADDR_INFO: |
| 882 | case SMP_CMD_SIGN_INFO: |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 883 | /* Just ignored */ |
| 884 | reason = 0; |
| 885 | break; |
| 886 | |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 887 | default: |
| 888 | BT_DBG("Unknown command code 0x%2.2x", code); |
| 889 | |
| 890 | reason = SMP_CMD_NOTSUPP; |
Vinicius Costa Gomes | 3a0259b | 2011-06-09 18:50:43 -0300 | [diff] [blame] | 891 | err = -EOPNOTSUPP; |
| 892 | goto done; |
| 893 | } |
| 894 | |
| 895 | done: |
| 896 | if (reason) |
Brian Gix | 4f957a7 | 2011-11-23 08:28:36 -0800 | [diff] [blame] | 897 | smp_failure(conn, reason, 1); |
Anderson Briglia | eb492e0 | 2011-06-09 18:50:40 -0300 | [diff] [blame] | 898 | |
| 899 | kfree_skb(skb); |
| 900 | return err; |
| 901 | } |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 902 | |
| 903 | int smp_distribute_keys(struct l2cap_conn *conn, __u8 force) |
| 904 | { |
| 905 | struct smp_cmd_pairing *req, *rsp; |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 906 | struct smp_chan *smp = conn->smp_chan; |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 907 | __u8 *keydist; |
| 908 | |
| 909 | BT_DBG("conn %p force %d", conn, force); |
| 910 | |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 911 | if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend)) |
| 912 | return 0; |
| 913 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 914 | rsp = (void *) &smp->prsp[1]; |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 915 | |
| 916 | /* The responder sends its keys first */ |
| 917 | if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07)) |
| 918 | return 0; |
| 919 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 920 | req = (void *) &smp->preq[1]; |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 921 | |
| 922 | if (conn->hcon->out) { |
| 923 | keydist = &rsp->init_key_dist; |
| 924 | *keydist &= req->init_key_dist; |
| 925 | } else { |
| 926 | keydist = &rsp->resp_key_dist; |
| 927 | *keydist &= req->resp_key_dist; |
| 928 | } |
| 929 | |
| 930 | |
| 931 | BT_DBG("keydist 0x%x", *keydist); |
| 932 | |
| 933 | if (*keydist & SMP_DIST_ENC_KEY) { |
| 934 | struct smp_cmd_encrypt_info enc; |
| 935 | struct smp_cmd_master_ident ident; |
| 936 | __le16 ediv; |
| 937 | |
| 938 | get_random_bytes(enc.ltk, sizeof(enc.ltk)); |
| 939 | get_random_bytes(&ediv, sizeof(ediv)); |
| 940 | get_random_bytes(ident.rand, sizeof(ident.rand)); |
| 941 | |
| 942 | smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); |
| 943 | |
Vinicius Costa Gomes | 1c1def0 | 2011-09-05 14:31:30 -0300 | [diff] [blame] | 944 | hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size, |
Vinicius Costa Gomes | 726b4ff | 2011-07-08 18:31:45 -0300 | [diff] [blame] | 945 | ediv, ident.rand, enc.ltk); |
Vinicius Costa Gomes | 16b9083 | 2011-07-07 18:59:39 -0300 | [diff] [blame] | 946 | |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 947 | ident.ediv = cpu_to_le16(ediv); |
| 948 | |
| 949 | smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident); |
| 950 | |
| 951 | *keydist &= ~SMP_DIST_ENC_KEY; |
| 952 | } |
| 953 | |
| 954 | if (*keydist & SMP_DIST_ID_KEY) { |
| 955 | struct smp_cmd_ident_addr_info addrinfo; |
| 956 | struct smp_cmd_ident_info idinfo; |
| 957 | |
| 958 | /* Send a dummy key */ |
| 959 | get_random_bytes(idinfo.irk, sizeof(idinfo.irk)); |
| 960 | |
| 961 | smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo); |
| 962 | |
| 963 | /* Just public address */ |
| 964 | memset(&addrinfo, 0, sizeof(addrinfo)); |
| 965 | bacpy(&addrinfo.bdaddr, conn->src); |
| 966 | |
| 967 | smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo), |
| 968 | &addrinfo); |
| 969 | |
| 970 | *keydist &= ~SMP_DIST_ID_KEY; |
| 971 | } |
| 972 | |
| 973 | if (*keydist & SMP_DIST_SIGN) { |
| 974 | struct smp_cmd_sign_info sign; |
| 975 | |
| 976 | /* Send a dummy key */ |
| 977 | get_random_bytes(sign.csrk, sizeof(sign.csrk)); |
| 978 | |
| 979 | smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign); |
| 980 | |
| 981 | *keydist &= ~SMP_DIST_SIGN; |
| 982 | } |
| 983 | |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 984 | if (conn->hcon->out || force) { |
| 985 | clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend); |
Gustavo F. Padovan | 6c9d42a | 2011-12-20 10:57:27 -0200 | [diff] [blame] | 986 | cancel_delayed_work_sync(&conn->security_timer); |
Vinicius Costa Gomes | 8aab475 | 2011-09-05 14:31:31 -0300 | [diff] [blame] | 987 | smp_chan_destroy(conn); |
Vinicius Costa Gomes | d26a234 | 2011-08-19 21:06:51 -0300 | [diff] [blame] | 988 | } |
| 989 | |
Vinicius Costa Gomes | 7034b91 | 2011-07-07 18:59:34 -0300 | [diff] [blame] | 990 | return 0; |
| 991 | } |