1/******************************************************************************
2 *
3 *  Copyright 1999-2012 Broadcom Corporation
4 *
5 *  Licensed under the Apache License, Version 2.0 (the "License");
6 *  you may not use this file except in compliance with the License.
7 *  You may obtain a copy of the License at:
8 *
9 *  http://www.apache.org/licenses/LICENSE-2.0
10 *
11 *  Unless required by applicable law or agreed to in writing, software
12 *  distributed under the License is distributed on an "AS IS" BASIS,
13 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 *  See the License for the specific language governing permissions and
15 *  limitations under the License.
16 *
17 *****************************************************************************/
18
19/******************************************************************************
20 *
21 *  This file contains functions for the SMP L2CAP utility functions
22 *
23 ******************************************************************************/
24#include "bt_target.h"
25
26#include <ctype.h>
27#include <string.h>
28#include "bt_types.h"
29#include "bt_utils.h"
30#include "btm_ble_api.h"
31#include "btm_int.h"
32#include "device/include/controller.h"
33#include "hcidefs.h"
34#include "l2c_api.h"
35#include "l2c_int.h"
36#include "osi/include/osi.h"
37#include "smp_int.h"
38
39#define SMP_PAIRING_REQ_SIZE 7
40#define SMP_CONFIRM_CMD_SIZE (BT_OCTET16_LEN + 1)
41#define SMP_RAND_CMD_SIZE (BT_OCTET16_LEN + 1)
42#define SMP_INIT_CMD_SIZE (BT_OCTET16_LEN + 1)
43#define SMP_ENC_INFO_SIZE (BT_OCTET16_LEN + 1)
44#define SMP_MASTER_ID_SIZE (BT_OCTET8_LEN + 2 + 1)
45#define SMP_ID_INFO_SIZE (BT_OCTET16_LEN + 1)
46#define SMP_ID_ADDR_SIZE (BD_ADDR_LEN + 1 + 1)
47#define SMP_SIGN_INFO_SIZE (BT_OCTET16_LEN + 1)
48#define SMP_PAIR_FAIL_SIZE 2
49#define SMP_SECURITY_REQUEST_SIZE 2
50#define SMP_PAIR_PUBL_KEY_SIZE (1 /* opcode */ + (2 * BT_OCTET32_LEN))
51#define SMP_PAIR_COMMITM_SIZE (1 /* opcode */ + BT_OCTET16_LEN /*Commitment*/)
52#define SMP_PAIR_DHKEY_CHECK_SIZE \
53  (1 /* opcode */ + BT_OCTET16_LEN /*DHKey Check*/)
54#define SMP_PAIR_KEYPR_NOTIF_SIZE (1 /* opcode */ + 1 /*Notif Type*/)
55
56/* SMP command sizes per spec */
57static const uint8_t smp_cmd_size_per_spec[] = {
58    0,
59    SMP_PAIRING_REQ_SIZE,      /* 0x01: pairing request */
60    SMP_PAIRING_REQ_SIZE,      /* 0x02: pairing response */
61    SMP_CONFIRM_CMD_SIZE,      /* 0x03: pairing confirm */
62    SMP_RAND_CMD_SIZE,         /* 0x04: pairing random */
63    SMP_PAIR_FAIL_SIZE,        /* 0x05: pairing failed */
64    SMP_ENC_INFO_SIZE,         /* 0x06: encryption information */
65    SMP_MASTER_ID_SIZE,        /* 0x07: master identification */
66    SMP_ID_INFO_SIZE,          /* 0x08: identity information */
67    SMP_ID_ADDR_SIZE,          /* 0x09: identity address information */
68    SMP_SIGN_INFO_SIZE,        /* 0x0A: signing information */
69    SMP_SECURITY_REQUEST_SIZE, /* 0x0B: security request */
70    SMP_PAIR_PUBL_KEY_SIZE,    /* 0x0C: pairing public key */
71    SMP_PAIR_DHKEY_CHECK_SIZE, /* 0x0D: pairing dhkey check */
72    SMP_PAIR_KEYPR_NOTIF_SIZE, /* 0x0E: pairing keypress notification */
73    SMP_PAIR_COMMITM_SIZE      /* 0x0F: pairing commitment */
74};
75
76static bool smp_parameter_unconditionally_valid(tSMP_CB* p_cb);
77static bool smp_parameter_unconditionally_invalid(tSMP_CB* p_cb);
78
79/* type for SMP command length validation functions */
80typedef bool (*tSMP_CMD_LEN_VALID)(tSMP_CB* p_cb);
81
82static bool smp_command_has_valid_fixed_length(tSMP_CB* p_cb);
83
84static const tSMP_CMD_LEN_VALID smp_cmd_len_is_valid[] = {
85    smp_parameter_unconditionally_invalid,
86    smp_command_has_valid_fixed_length, /* 0x01: pairing request */
87    smp_command_has_valid_fixed_length, /* 0x02: pairing response */
88    smp_command_has_valid_fixed_length, /* 0x03: pairing confirm */
89    smp_command_has_valid_fixed_length, /* 0x04: pairing random */
90    smp_command_has_valid_fixed_length, /* 0x05: pairing failed */
91    smp_command_has_valid_fixed_length, /* 0x06: encryption information */
92    smp_command_has_valid_fixed_length, /* 0x07: master identification */
93    smp_command_has_valid_fixed_length, /* 0x08: identity information */
94    smp_command_has_valid_fixed_length, /* 0x09: identity address information */
95    smp_command_has_valid_fixed_length, /* 0x0A: signing information */
96    smp_command_has_valid_fixed_length, /* 0x0B: security request */
97    smp_command_has_valid_fixed_length, /* 0x0C: pairing public key */
98    smp_command_has_valid_fixed_length, /* 0x0D: pairing dhkey check */
99    smp_command_has_valid_fixed_length, /* 0x0E: pairing keypress notification*/
100    smp_command_has_valid_fixed_length  /* 0x0F: pairing commitment */
101};
102
103/* type for SMP command parameter ranges validation functions */
104typedef bool (*tSMP_CMD_PARAM_RANGES_VALID)(tSMP_CB* p_cb);
105
106static bool smp_pairing_request_response_parameters_are_valid(tSMP_CB* p_cb);
107static bool smp_pairing_keypress_notification_is_valid(tSMP_CB* p_cb);
108
109static const tSMP_CMD_PARAM_RANGES_VALID smp_cmd_param_ranges_are_valid[] = {
110    smp_parameter_unconditionally_invalid,
111    smp_pairing_request_response_parameters_are_valid, /* 0x01: pairing
112                                                          request */
113    smp_pairing_request_response_parameters_are_valid, /* 0x02: pairing
114                                                          response */
115    smp_parameter_unconditionally_valid, /* 0x03: pairing confirm */
116    smp_parameter_unconditionally_valid, /* 0x04: pairing random */
117    smp_parameter_unconditionally_valid, /* 0x05: pairing failed */
118    smp_parameter_unconditionally_valid, /* 0x06: encryption information */
119    smp_parameter_unconditionally_valid, /* 0x07: master identification */
120    smp_parameter_unconditionally_valid, /* 0x08: identity information */
121    smp_parameter_unconditionally_valid, /* 0x09: identity address
122                                            information */
123    smp_parameter_unconditionally_valid, /* 0x0A: signing information */
124    smp_parameter_unconditionally_valid, /* 0x0B: security request */
125    smp_parameter_unconditionally_valid, /* 0x0C: pairing public key */
126    smp_parameter_unconditionally_valid, /* 0x0D: pairing dhkey check */
127    smp_pairing_keypress_notification_is_valid, /* 0x0E: pairing keypress
128                                                   notification */
129    smp_parameter_unconditionally_valid         /* 0x0F: pairing commitment */
130};
131
132/* type for action functions */
133typedef BT_HDR* (*tSMP_CMD_ACT)(uint8_t cmd_code, tSMP_CB* p_cb);
134
135static BT_HDR* smp_build_pairing_cmd(uint8_t cmd_code, tSMP_CB* p_cb);
136static BT_HDR* smp_build_confirm_cmd(UNUSED_ATTR uint8_t cmd_code,
137                                     tSMP_CB* p_cb);
138static BT_HDR* smp_build_rand_cmd(UNUSED_ATTR uint8_t cmd_code, tSMP_CB* p_cb);
139static BT_HDR* smp_build_pairing_fail(UNUSED_ATTR uint8_t cmd_code,
140                                      tSMP_CB* p_cb);
141static BT_HDR* smp_build_identity_info_cmd(UNUSED_ATTR uint8_t cmd_code,
142                                           tSMP_CB* p_cb);
143static BT_HDR* smp_build_encrypt_info_cmd(UNUSED_ATTR uint8_t cmd_code,
144                                          tSMP_CB* p_cb);
145static BT_HDR* smp_build_security_request(UNUSED_ATTR uint8_t cmd_code,
146                                          tSMP_CB* p_cb);
147static BT_HDR* smp_build_signing_info_cmd(UNUSED_ATTR uint8_t cmd_code,
148                                          tSMP_CB* p_cb);
149static BT_HDR* smp_build_master_id_cmd(UNUSED_ATTR uint8_t cmd_code,
150                                       tSMP_CB* p_cb);
151static BT_HDR* smp_build_id_addr_cmd(UNUSED_ATTR uint8_t cmd_code,
152                                     tSMP_CB* p_cb);
153static BT_HDR* smp_build_pair_public_key_cmd(UNUSED_ATTR uint8_t cmd_code,
154                                             tSMP_CB* p_cb);
155static BT_HDR* smp_build_pairing_commitment_cmd(UNUSED_ATTR uint8_t cmd_code,
156                                                tSMP_CB* p_cb);
157static BT_HDR* smp_build_pair_dhkey_check_cmd(UNUSED_ATTR uint8_t cmd_code,
158                                              tSMP_CB* p_cb);
159static BT_HDR* smp_build_pairing_keypress_notification_cmd(
160    UNUSED_ATTR uint8_t cmd_code, tSMP_CB* p_cb);
161
162static const tSMP_CMD_ACT smp_cmd_build_act[] = {
163    NULL, smp_build_pairing_cmd,    /* 0x01: pairing request */
164    smp_build_pairing_cmd,          /* 0x02: pairing response */
165    smp_build_confirm_cmd,          /* 0x03: pairing confirm */
166    smp_build_rand_cmd,             /* 0x04: pairing random */
167    smp_build_pairing_fail,         /* 0x05: pairing failure */
168    smp_build_encrypt_info_cmd,     /* 0x06: encryption information */
169    smp_build_master_id_cmd,        /* 0x07: master identification */
170    smp_build_identity_info_cmd,    /* 0x08: identity information */
171    smp_build_id_addr_cmd,          /* 0x09: identity address information */
172    smp_build_signing_info_cmd,     /* 0x0A: signing information */
173    smp_build_security_request,     /* 0x0B: security request */
174    smp_build_pair_public_key_cmd,  /* 0x0C: pairing public key */
175    smp_build_pair_dhkey_check_cmd, /* 0x0D: pairing DHKey check */
176    smp_build_pairing_keypress_notification_cmd, /* 0x0E: pairing keypress
177                                                    notification */
178    smp_build_pairing_commitment_cmd             /* 0x0F: pairing commitment */
179};
180
181static const uint8_t smp_association_table[2][SMP_IO_CAP_MAX][SMP_IO_CAP_MAX] =
182    {
183        /* display only */ /* Display Yes/No */ /* keyboard only */
184        /* No Input/Output */                   /* keyboard display */
185
186        /* initiator */
187        /* model = tbl[peer_io_caps][loc_io_caps] */
188        /* Display Only */
189        {{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
190          SMP_MODEL_PASSKEY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY},
191
192         /* Display Yes/No */
193         {SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
194          SMP_MODEL_PASSKEY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY},
195
196         /* Keyboard only */
197         {SMP_MODEL_KEY_NOTIF, SMP_MODEL_KEY_NOTIF, SMP_MODEL_PASSKEY,
198          SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF},
199
200         /* No Input No Output */
201         {SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
202          SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
203          SMP_MODEL_ENCRYPTION_ONLY},
204
205         /* keyboard display */
206         {SMP_MODEL_KEY_NOTIF, SMP_MODEL_KEY_NOTIF, SMP_MODEL_PASSKEY,
207          SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF}},
208
209        /* responder */
210        /* model = tbl[loc_io_caps][peer_io_caps] */
211        /* Display Only */
212        {{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
213          SMP_MODEL_KEY_NOTIF, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF},
214
215         /* Display Yes/No */
216         {SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
217          SMP_MODEL_KEY_NOTIF, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF},
218
219         /* keyboard only */
220         {SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY,
221          SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY},
222
223         /* No Input No Output */
224         {SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
225          SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
226          SMP_MODEL_ENCRYPTION_ONLY},
227
228         /* keyboard display */
229         {SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY, SMP_MODEL_KEY_NOTIF,
230          SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY}}};
231
232static const uint8_t
233    smp_association_table_sc[2][SMP_IO_CAP_MAX][SMP_IO_CAP_MAX] = {
234        /* display only */ /* Display Yes/No */ /* keyboard only */
235        /* No InputOutput */                    /* keyboard display */
236
237        /* initiator */
238        /* model = tbl[peer_io_caps][loc_io_caps] */
239
240        /* Display Only */
241        {{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
242          SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_JUSTWORKS,
243          SMP_MODEL_SEC_CONN_PASSKEY_ENT},
244
245         /* Display Yes/No */
246         {SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP,
247          SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_JUSTWORKS,
248          SMP_MODEL_SEC_CONN_NUM_COMP},
249
250         /* keyboard only */
251         {SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_PASSKEY_DISP,
252          SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_JUSTWORKS,
253          SMP_MODEL_SEC_CONN_PASSKEY_DISP},
254
255         /* No Input No Output */
256         {SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
257          SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
258          SMP_MODEL_SEC_CONN_JUSTWORKS},
259
260         /* keyboard display */
261         {SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_NUM_COMP,
262          SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_JUSTWORKS,
263          SMP_MODEL_SEC_CONN_NUM_COMP}},
264
265        /* responder */
266        /* model = tbl[loc_io_caps][peer_io_caps] */
267
268        /* Display Only */
269        {{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
270          SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_JUSTWORKS,
271          SMP_MODEL_SEC_CONN_PASSKEY_DISP},
272
273         /* Display Yes/No */
274         {SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP,
275          SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_JUSTWORKS,
276          SMP_MODEL_SEC_CONN_NUM_COMP},
277
278         /* keyboard only */
279         {SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
280          SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_JUSTWORKS,
281          SMP_MODEL_SEC_CONN_PASSKEY_ENT},
282
283         /* No Input No Output */
284         {SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
285          SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
286          SMP_MODEL_SEC_CONN_JUSTWORKS},
287
288         /* keyboard display */
289         {SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_NUM_COMP,
290          SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_JUSTWORKS,
291          SMP_MODEL_SEC_CONN_NUM_COMP}}};
292
293static tSMP_ASSO_MODEL smp_select_legacy_association_model(tSMP_CB* p_cb);
294static tSMP_ASSO_MODEL smp_select_association_model_secure_connections(
295    tSMP_CB* p_cb);
296
297/*******************************************************************************
298 *
299 * Function         smp_send_msg_to_L2CAP
300 *
301 * Description      Send message to L2CAP.
302 *
303 ******************************************************************************/
304bool smp_send_msg_to_L2CAP(const RawAddress& rem_bda, BT_HDR* p_toL2CAP) {
305  uint16_t l2cap_ret;
306  uint16_t fixed_cid = L2CAP_SMP_CID;
307
308  if (smp_cb.smp_over_br) {
309    fixed_cid = L2CAP_SMP_BR_CID;
310  }
311
312  SMP_TRACE_EVENT("%s", __func__);
313  smp_cb.total_tx_unacked += 1;
314
315  l2cap_ret = L2CA_SendFixedChnlData(fixed_cid, rem_bda, p_toL2CAP);
316  if (l2cap_ret == L2CAP_DW_FAILED) {
317    smp_cb.total_tx_unacked -= 1;
318    SMP_TRACE_ERROR("SMP failed to pass msg to L2CAP");
319    return false;
320  } else
321    return true;
322}
323
324/*******************************************************************************
325 *
326 * Function         smp_send_cmd
327 *
328 * Description      send a SMP command on L2CAP channel.
329 *
330 ******************************************************************************/
331bool smp_send_cmd(uint8_t cmd_code, tSMP_CB* p_cb) {
332  BT_HDR* p_buf;
333  bool sent = false;
334
335  SMP_TRACE_EVENT("%s: on l2cap cmd_code=0x%x, pairing_bda=%s", __func__,
336                  cmd_code, p_cb->pairing_bda.ToString().c_str());
337
338  if (cmd_code <= (SMP_OPCODE_MAX + 1 /* for SMP_OPCODE_PAIR_COMMITM */) &&
339      smp_cmd_build_act[cmd_code] != NULL) {
340    p_buf = (*smp_cmd_build_act[cmd_code])(cmd_code, p_cb);
341
342    if (p_buf != NULL && smp_send_msg_to_L2CAP(p_cb->pairing_bda, p_buf)) {
343      sent = true;
344      alarm_set_on_mloop(p_cb->smp_rsp_timer_ent, SMP_WAIT_FOR_RSP_TIMEOUT_MS,
345                         smp_rsp_timeout, NULL);
346    }
347  }
348
349  if (!sent) {
350    tSMP_INT_DATA smp_int_data;
351    smp_int_data.status = SMP_PAIR_INTERNAL_ERR;
352    if (p_cb->smp_over_br) {
353      smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &smp_int_data);
354    } else {
355      smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &smp_int_data);
356    }
357  }
358  return sent;
359}
360
361/*******************************************************************************
362 *
363 * Function         smp_rsp_timeout
364 *
365 * Description      Called when SMP wait for SMP command response timer expires
366 *
367 * Returns          void
368 *
369 ******************************************************************************/
370void smp_rsp_timeout(UNUSED_ATTR void* data) {
371  tSMP_CB* p_cb = &smp_cb;
372
373  SMP_TRACE_EVENT("%s state:%d br_state:%d", __func__, p_cb->state,
374                  p_cb->br_state);
375
376  tSMP_INT_DATA smp_int_data;
377  smp_int_data.status = SMP_RSP_TIMEOUT;
378  if (p_cb->smp_over_br) {
379    smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &smp_int_data);
380  } else {
381    smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &smp_int_data);
382  }
383}
384
385/*******************************************************************************
386 *
387 * Function         smp_delayed_auth_complete_timeout
388 *
389 * Description      Called when no pairing failed command received within
390 *                  timeout period.
391 *
392 * Returns          void
393 *
394 ******************************************************************************/
395void smp_delayed_auth_complete_timeout(UNUSED_ATTR void* data) {
396  /*
397   * Waited for potential pair failure. Send SMP_AUTH_CMPL_EVT if
398   * the state is still in bond pending.
399   */
400  if (smp_get_state() == SMP_STATE_BOND_PENDING) {
401    SMP_TRACE_EVENT("%s sending delayed auth complete.", __func__);
402    tSMP_INT_DATA smp_int_data;
403    smp_int_data.status = SMP_SUCCESS;
404    smp_sm_event(&smp_cb, SMP_AUTH_CMPL_EVT, &smp_int_data);
405  }
406}
407
408/*******************************************************************************
409 *
410 * Function         smp_build_pairing_req_cmd
411 *
412 * Description      Build pairing request command.
413 *
414 ******************************************************************************/
415BT_HDR* smp_build_pairing_cmd(uint8_t cmd_code, tSMP_CB* p_cb) {
416  uint8_t* p;
417  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_PAIRING_REQ_SIZE +
418                                      L2CAP_MIN_OFFSET);
419
420  SMP_TRACE_EVENT("%s", __func__);
421
422  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
423  UINT8_TO_STREAM(p, cmd_code);
424  UINT8_TO_STREAM(p, p_cb->local_io_capability);
425  UINT8_TO_STREAM(p, p_cb->loc_oob_flag);
426  UINT8_TO_STREAM(p, p_cb->loc_auth_req);
427  UINT8_TO_STREAM(p, p_cb->loc_enc_size);
428  UINT8_TO_STREAM(p, p_cb->local_i_key);
429  UINT8_TO_STREAM(p, p_cb->local_r_key);
430
431  p_buf->offset = L2CAP_MIN_OFFSET;
432  /* 1B ERR_RSP op code + 1B cmd_op_code + 2B handle + 1B status */
433  p_buf->len = SMP_PAIRING_REQ_SIZE;
434
435  return p_buf;
436}
437
438/*******************************************************************************
439 *
440 * Function         smp_build_confirm_cmd
441 *
442 * Description      Build confirm request command.
443 *
444 ******************************************************************************/
445static BT_HDR* smp_build_confirm_cmd(UNUSED_ATTR uint8_t cmd_code,
446                                     tSMP_CB* p_cb) {
447  uint8_t* p;
448  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_CONFIRM_CMD_SIZE +
449                                      L2CAP_MIN_OFFSET);
450
451  SMP_TRACE_EVENT("%s", __func__);
452
453  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
454
455  UINT8_TO_STREAM(p, SMP_OPCODE_CONFIRM);
456  ARRAY_TO_STREAM(p, p_cb->confirm, BT_OCTET16_LEN);
457
458  p_buf->offset = L2CAP_MIN_OFFSET;
459  p_buf->len = SMP_CONFIRM_CMD_SIZE;
460
461  return p_buf;
462}
463
464/*******************************************************************************
465 *
466 * Function         smp_build_rand_cmd
467 *
468 * Description      Build Random command.
469 *
470 ******************************************************************************/
471static BT_HDR* smp_build_rand_cmd(UNUSED_ATTR uint8_t cmd_code, tSMP_CB* p_cb) {
472  uint8_t* p;
473  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_RAND_CMD_SIZE +
474                                      L2CAP_MIN_OFFSET);
475
476  SMP_TRACE_EVENT("%s", __func__);
477
478  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
479  UINT8_TO_STREAM(p, SMP_OPCODE_RAND);
480  ARRAY_TO_STREAM(p, p_cb->rand, BT_OCTET16_LEN);
481
482  p_buf->offset = L2CAP_MIN_OFFSET;
483  p_buf->len = SMP_RAND_CMD_SIZE;
484
485  return p_buf;
486}
487
488/*******************************************************************************
489 *
490 * Function         smp_build_encrypt_info_cmd
491 *
492 * Description      Build security information command.
493 *
494 ******************************************************************************/
495static BT_HDR* smp_build_encrypt_info_cmd(UNUSED_ATTR uint8_t cmd_code,
496                                          tSMP_CB* p_cb) {
497  uint8_t* p;
498  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_ENC_INFO_SIZE +
499                                      L2CAP_MIN_OFFSET);
500
501  SMP_TRACE_EVENT("%s", __func__);
502
503  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
504  UINT8_TO_STREAM(p, SMP_OPCODE_ENCRYPT_INFO);
505  ARRAY_TO_STREAM(p, p_cb->ltk, BT_OCTET16_LEN);
506
507  p_buf->offset = L2CAP_MIN_OFFSET;
508  p_buf->len = SMP_ENC_INFO_SIZE;
509
510  return p_buf;
511}
512
513/*******************************************************************************
514 *
515 * Function         smp_build_master_id_cmd
516 *
517 * Description      Build security information command.
518 *
519 ******************************************************************************/
520static BT_HDR* smp_build_master_id_cmd(UNUSED_ATTR uint8_t cmd_code,
521                                       tSMP_CB* p_cb) {
522  uint8_t* p;
523  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_MASTER_ID_SIZE +
524                                      L2CAP_MIN_OFFSET);
525
526  SMP_TRACE_EVENT("%s", __func__);
527
528  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
529  UINT8_TO_STREAM(p, SMP_OPCODE_MASTER_ID);
530  UINT16_TO_STREAM(p, p_cb->ediv);
531  ARRAY_TO_STREAM(p, p_cb->enc_rand, BT_OCTET8_LEN);
532
533  p_buf->offset = L2CAP_MIN_OFFSET;
534  p_buf->len = SMP_MASTER_ID_SIZE;
535
536  return p_buf;
537}
538
539/*******************************************************************************
540 *
541 * Function         smp_build_identity_info_cmd
542 *
543 * Description      Build identity information command.
544 *
545 ******************************************************************************/
546static BT_HDR* smp_build_identity_info_cmd(UNUSED_ATTR uint8_t cmd_code,
547                                           UNUSED_ATTR tSMP_CB* p_cb) {
548  uint8_t* p;
549  BT_OCTET16 irk;
550  BT_HDR* p_buf =
551      (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_ID_INFO_SIZE + L2CAP_MIN_OFFSET);
552
553  SMP_TRACE_EVENT("%s", __func__);
554
555  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
556
557  BTM_GetDeviceIDRoot(irk);
558
559  UINT8_TO_STREAM(p, SMP_OPCODE_IDENTITY_INFO);
560  ARRAY_TO_STREAM(p, irk, BT_OCTET16_LEN);
561
562  p_buf->offset = L2CAP_MIN_OFFSET;
563  p_buf->len = SMP_ID_INFO_SIZE;
564
565  return p_buf;
566}
567
568/*******************************************************************************
569 *
570 * Function         smp_build_id_addr_cmd
571 *
572 * Description      Build identity address information command.
573 *
574 ******************************************************************************/
575static BT_HDR* smp_build_id_addr_cmd(UNUSED_ATTR uint8_t cmd_code,
576                                     UNUSED_ATTR tSMP_CB* p_cb) {
577  uint8_t* p;
578  BT_HDR* p_buf =
579      (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_ID_ADDR_SIZE + L2CAP_MIN_OFFSET);
580
581  SMP_TRACE_EVENT("%s", __func__);
582
583  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
584  UINT8_TO_STREAM(p, SMP_OPCODE_ID_ADDR);
585  UINT8_TO_STREAM(p, 0);
586  BDADDR_TO_STREAM(p, *controller_get_interface()->get_address());
587
588  p_buf->offset = L2CAP_MIN_OFFSET;
589  p_buf->len = SMP_ID_ADDR_SIZE;
590
591  return p_buf;
592}
593
594/*******************************************************************************
595 *
596 * Function         smp_build_signing_info_cmd
597 *
598 * Description      Build signing information command.
599 *
600 ******************************************************************************/
601static BT_HDR* smp_build_signing_info_cmd(UNUSED_ATTR uint8_t cmd_code,
602                                          tSMP_CB* p_cb) {
603  uint8_t* p;
604  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_SIGN_INFO_SIZE +
605                                      L2CAP_MIN_OFFSET);
606
607  SMP_TRACE_EVENT("%s", __func__);
608
609  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
610  UINT8_TO_STREAM(p, SMP_OPCODE_SIGN_INFO);
611  ARRAY_TO_STREAM(p, p_cb->csrk, BT_OCTET16_LEN);
612
613  p_buf->offset = L2CAP_MIN_OFFSET;
614  p_buf->len = SMP_SIGN_INFO_SIZE;
615
616  return p_buf;
617}
618
619/*******************************************************************************
620 *
621 * Function         smp_build_pairing_fail
622 *
623 * Description      Build Pairing Fail command.
624 *
625 ******************************************************************************/
626static BT_HDR* smp_build_pairing_fail(UNUSED_ATTR uint8_t cmd_code,
627                                      tSMP_CB* p_cb) {
628  uint8_t* p;
629  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_PAIR_FAIL_SIZE +
630                                      L2CAP_MIN_OFFSET);
631
632  SMP_TRACE_EVENT("%s", __func__);
633
634  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
635  UINT8_TO_STREAM(p, SMP_OPCODE_PAIRING_FAILED);
636  UINT8_TO_STREAM(p, p_cb->failure);
637
638  p_buf->offset = L2CAP_MIN_OFFSET;
639  p_buf->len = SMP_PAIR_FAIL_SIZE;
640
641  return p_buf;
642}
643
644/*******************************************************************************
645 *
646 * Function         smp_build_security_request
647 *
648 * Description      Build security request command.
649 *
650 ******************************************************************************/
651static BT_HDR* smp_build_security_request(UNUSED_ATTR uint8_t cmd_code,
652                                          tSMP_CB* p_cb) {
653  uint8_t* p;
654  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + 2 + L2CAP_MIN_OFFSET);
655
656  SMP_TRACE_EVENT("%s", __func__);
657
658  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
659  UINT8_TO_STREAM(p, SMP_OPCODE_SEC_REQ);
660  UINT8_TO_STREAM(p, p_cb->loc_auth_req);
661
662  p_buf->offset = L2CAP_MIN_OFFSET;
663  p_buf->len = SMP_SECURITY_REQUEST_SIZE;
664
665  SMP_TRACE_EVENT("opcode=%d auth_req=0x%x", SMP_OPCODE_SEC_REQ,
666                  p_cb->loc_auth_req);
667
668  return p_buf;
669}
670
671/*******************************************************************************
672 *
673 * Function         smp_build_pair_public_key_cmd
674 *
675 * Description      Build pairing public key command.
676 *
677 ******************************************************************************/
678static BT_HDR* smp_build_pair_public_key_cmd(UNUSED_ATTR uint8_t cmd_code,
679                                             tSMP_CB* p_cb) {
680  uint8_t* p;
681  uint8_t publ_key[2 * BT_OCTET32_LEN];
682  uint8_t* p_publ_key = publ_key;
683  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_PAIR_PUBL_KEY_SIZE +
684                                      L2CAP_MIN_OFFSET);
685
686  SMP_TRACE_EVENT("%s", __func__);
687
688  memcpy(p_publ_key, p_cb->loc_publ_key.x, BT_OCTET32_LEN);
689  memcpy(p_publ_key + BT_OCTET32_LEN, p_cb->loc_publ_key.y, BT_OCTET32_LEN);
690
691  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
692  UINT8_TO_STREAM(p, SMP_OPCODE_PAIR_PUBLIC_KEY);
693  ARRAY_TO_STREAM(p, p_publ_key, 2 * BT_OCTET32_LEN);
694
695  p_buf->offset = L2CAP_MIN_OFFSET;
696  p_buf->len = SMP_PAIR_PUBL_KEY_SIZE;
697
698  return p_buf;
699}
700
701/*******************************************************************************
702 *
703 * Function         smp_build_pairing_commitment_cmd
704 *
705 * Description      Build pairing commitment command.
706 *
707 ******************************************************************************/
708static BT_HDR* smp_build_pairing_commitment_cmd(UNUSED_ATTR uint8_t cmd_code,
709                                                tSMP_CB* p_cb) {
710  uint8_t* p;
711  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_PAIR_COMMITM_SIZE +
712                                      L2CAP_MIN_OFFSET);
713
714  SMP_TRACE_EVENT("%s", __func__);
715
716  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
717  UINT8_TO_STREAM(p, SMP_OPCODE_CONFIRM);
718  ARRAY_TO_STREAM(p, p_cb->commitment, BT_OCTET16_LEN);
719
720  p_buf->offset = L2CAP_MIN_OFFSET;
721  p_buf->len = SMP_PAIR_COMMITM_SIZE;
722
723  return p_buf;
724}
725
726/*******************************************************************************
727 *
728 * Function         smp_build_pair_dhkey_check_cmd
729 *
730 * Description      Build pairing DHKey check command.
731 *
732 ******************************************************************************/
733static BT_HDR* smp_build_pair_dhkey_check_cmd(UNUSED_ATTR uint8_t cmd_code,
734                                              tSMP_CB* p_cb) {
735  uint8_t* p;
736  BT_HDR* p_buf = (BT_HDR*)osi_malloc(
737      sizeof(BT_HDR) + SMP_PAIR_DHKEY_CHECK_SIZE + L2CAP_MIN_OFFSET);
738
739  SMP_TRACE_EVENT("%s", __func__);
740
741  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
742  UINT8_TO_STREAM(p, SMP_OPCODE_PAIR_DHKEY_CHECK);
743  ARRAY_TO_STREAM(p, p_cb->dhkey_check, BT_OCTET16_LEN);
744
745  p_buf->offset = L2CAP_MIN_OFFSET;
746  p_buf->len = SMP_PAIR_DHKEY_CHECK_SIZE;
747
748  return p_buf;
749}
750
751/*******************************************************************************
752 *
753 * Function         smp_build_pairing_keypress_notification_cmd
754 *
755 * Description      Build keypress notification command.
756 *
757 ******************************************************************************/
758static BT_HDR* smp_build_pairing_keypress_notification_cmd(
759    UNUSED_ATTR uint8_t cmd_code, tSMP_CB* p_cb) {
760  uint8_t* p;
761  BT_HDR* p_buf = (BT_HDR*)osi_malloc(
762      sizeof(BT_HDR) + SMP_PAIR_KEYPR_NOTIF_SIZE + L2CAP_MIN_OFFSET);
763
764  SMP_TRACE_EVENT("%s", __func__);
765
766  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
767  UINT8_TO_STREAM(p, SMP_OPCODE_PAIR_KEYPR_NOTIF);
768  UINT8_TO_STREAM(p, p_cb->local_keypress_notification);
769
770  p_buf->offset = L2CAP_MIN_OFFSET;
771  p_buf->len = SMP_PAIR_KEYPR_NOTIF_SIZE;
772
773  return p_buf;
774}
775
776/*******************************************************************************
777 *
778 * Function         smp_convert_string_to_tk
779 *
780 * Description      This function is called to convert a 6 to 16 digits numeric
781 *                  character string into SMP TK.
782 *
783 *
784 * Returns          void
785 *
786 ******************************************************************************/
787void smp_convert_string_to_tk(BT_OCTET16 tk, uint32_t passkey) {
788  uint8_t* p = tk;
789  tSMP_KEY key;
790  SMP_TRACE_EVENT("smp_convert_string_to_tk");
791  UINT32_TO_STREAM(p, passkey);
792
793  key.key_type = SMP_KEY_TYPE_TK;
794  key.p_data = tk;
795
796  tSMP_INT_DATA smp_int_data;
797  smp_int_data.key = key;
798  smp_sm_event(&smp_cb, SMP_KEY_READY_EVT, &smp_int_data);
799}
800
801/*******************************************************************************
802 *
803 * Function         smp_mask_enc_key
804 *
805 * Description      This function is called to mask off the encryption key based
806 *                  on the maximum encryption key size.
807 *
808 *
809 * Returns          void
810 *
811 ******************************************************************************/
812void smp_mask_enc_key(uint8_t loc_enc_size, uint8_t* p_data) {
813  SMP_TRACE_EVENT("smp_mask_enc_key");
814  if (loc_enc_size < BT_OCTET16_LEN) {
815    for (; loc_enc_size < BT_OCTET16_LEN; loc_enc_size++)
816      *(p_data + loc_enc_size) = 0;
817  }
818  return;
819}
820
821/*******************************************************************************
822 *
823 * Function         smp_xor_128
824 *
825 * Description      utility function to do an biteise exclusive-OR of two bit
826 *                  strings of the length of BT_OCTET16_LEN.
827 *
828 * Returns          void
829 *
830 ******************************************************************************/
831void smp_xor_128(BT_OCTET16 a, BT_OCTET16 b) {
832  uint8_t i, *aa = a, *bb = b;
833
834  SMP_TRACE_EVENT("smp_xor_128");
835  for (i = 0; i < BT_OCTET16_LEN; i++) {
836    aa[i] = aa[i] ^ bb[i];
837  }
838}
839
840/*******************************************************************************
841 *
842 * Function         smp_cb_cleanup
843 *
844 * Description      Clean up SMP control block
845 *
846 * Returns          void
847 *
848 ******************************************************************************/
849void smp_cb_cleanup(tSMP_CB* p_cb) {
850  tSMP_CALLBACK* p_callback = p_cb->p_callback;
851  uint8_t trace_level = p_cb->trace_level;
852  alarm_t* smp_rsp_timer_ent = p_cb->smp_rsp_timer_ent;
853  alarm_t* delayed_auth_timer_ent = p_cb->delayed_auth_timer_ent;
854
855  SMP_TRACE_EVENT("smp_cb_cleanup");
856
857  alarm_cancel(p_cb->smp_rsp_timer_ent);
858  alarm_cancel(p_cb->delayed_auth_timer_ent);
859  memset(p_cb, 0, sizeof(tSMP_CB));
860  p_cb->p_callback = p_callback;
861  p_cb->trace_level = trace_level;
862  p_cb->smp_rsp_timer_ent = smp_rsp_timer_ent;
863  p_cb->delayed_auth_timer_ent = delayed_auth_timer_ent;
864}
865
866/*******************************************************************************
867 *
868 * Function         smp_remove_fixed_channel
869 *
870 * Description      This function is called to remove the fixed channel
871 *
872 * Returns          void
873 *
874 ******************************************************************************/
875void smp_remove_fixed_channel(tSMP_CB* p_cb) {
876  SMP_TRACE_DEBUG("%s", __func__);
877
878  if (p_cb->smp_over_br)
879    L2CA_RemoveFixedChnl(L2CAP_SMP_BR_CID, p_cb->pairing_bda);
880  else
881    L2CA_RemoveFixedChnl(L2CAP_SMP_CID, p_cb->pairing_bda);
882}
883
884/*******************************************************************************
885 *
886 * Function         smp_reset_control_value
887 *
888 * Description      This function is called to reset the control block value
889 *                  when the pairing procedure finished.
890 *
891 *
892 * Returns          void
893 *
894 ******************************************************************************/
895void smp_reset_control_value(tSMP_CB* p_cb) {
896  SMP_TRACE_EVENT("%s", __func__);
897
898  alarm_cancel(p_cb->smp_rsp_timer_ent);
899  p_cb->flags = 0;
900  /* set the link idle timer to drop the link when pairing is done
901     usually service discovery will follow authentication complete, to avoid
902     racing condition for a link down/up, set link idle timer to be
903     SMP_LINK_TOUT_MIN to guarantee SMP key exchange */
904  L2CA_SetIdleTimeoutByBdAddr(p_cb->pairing_bda, SMP_LINK_TOUT_MIN,
905                              BT_TRANSPORT_LE);
906
907  /* We can tell L2CAP to remove the fixed channel (if it has one) */
908  smp_remove_fixed_channel(p_cb);
909  smp_cb_cleanup(p_cb);
910}
911
912/*******************************************************************************
913 *
914 * Function         smp_proc_pairing_cmpl
915 *
916 * Description      This function is called to process pairing complete
917 *
918 *
919 * Returns          void
920 *
921 ******************************************************************************/
922void smp_proc_pairing_cmpl(tSMP_CB* p_cb) {
923  tSMP_EVT_DATA evt_data = {0};
924  tSMP_CALLBACK* p_callback = p_cb->p_callback;
925
926  SMP_TRACE_DEBUG("%s: pairing_bda=%s", __func__,
927                  p_cb->pairing_bda.ToString().c_str());
928
929  evt_data.cmplt.reason = p_cb->status;
930  evt_data.cmplt.smp_over_br = p_cb->smp_over_br;
931
932  if (p_cb->status == SMP_SUCCESS) evt_data.cmplt.sec_level = p_cb->sec_level;
933
934  evt_data.cmplt.is_pair_cancel = false;
935
936  if (p_cb->is_pair_cancel) evt_data.cmplt.is_pair_cancel = true;
937
938  SMP_TRACE_DEBUG("send SMP_COMPLT_EVT reason=0x%0x sec_level=0x%0x",
939                  evt_data.cmplt.reason, evt_data.cmplt.sec_level);
940
941  RawAddress pairing_bda = p_cb->pairing_bda;
942
943  smp_reset_control_value(p_cb);
944
945  if (p_callback) (*p_callback)(SMP_COMPLT_EVT, pairing_bda, &evt_data);
946}
947
948/*******************************************************************************
949 *
950 * Function         smp_command_has_invalid_parameters
951 *
952 * Description      Checks if the received SMP command has invalid parameters
953 *                  i.e. if the command length is valid and the command
954 *                  parameters are inside specified range.
955 *                  It returns true if the command has invalid parameters.
956 *
957 * Returns          true if the command has invalid parameters, false otherwise.
958 *
959 ******************************************************************************/
960bool smp_command_has_invalid_parameters(tSMP_CB* p_cb) {
961  uint8_t cmd_code = p_cb->rcvd_cmd_code;
962
963  if ((cmd_code > (SMP_OPCODE_MAX + 1 /* for SMP_OPCODE_PAIR_COMMITM */)) ||
964      (cmd_code < SMP_OPCODE_MIN)) {
965    SMP_TRACE_WARNING("%s: Received command with RESERVED code 0x%02x",
966                      __func__, cmd_code);
967    return true;
968  }
969
970  if (!(*smp_cmd_len_is_valid[cmd_code])(p_cb)) {
971    SMP_TRACE_WARNING("%s: Command length not valid for cmd_code 0x%02x",
972                      __func__, cmd_code);
973    return true;
974  }
975
976  if (!(*smp_cmd_param_ranges_are_valid[cmd_code])(p_cb)) {
977    SMP_TRACE_WARNING("%s: Parameter ranges not valid code 0x%02x", __func__,
978                      cmd_code);
979    return true;
980  }
981
982  return false;
983}
984
985/*******************************************************************************
986 *
987 * Function         smp_command_has_valid_fixed_length
988 *
989 * Description      Checks if the received command size is equal to the size
990 *                  according to specs.
991 *
992 * Returns          true if the command size is as expected, false otherwise.
993 *
994 * Note             The command is expected to have fixed length.
995 ******************************************************************************/
996bool smp_command_has_valid_fixed_length(tSMP_CB* p_cb) {
997  uint8_t cmd_code = p_cb->rcvd_cmd_code;
998
999  SMP_TRACE_DEBUG("%s for cmd code 0x%02x", __func__, cmd_code);
1000
1001  if (p_cb->rcvd_cmd_len != smp_cmd_size_per_spec[cmd_code]) {
1002    SMP_TRACE_WARNING(
1003        "Rcvd from the peer cmd 0x%02x with invalid length "
1004        "0x%02x (per spec the length is 0x%02x).",
1005        cmd_code, p_cb->rcvd_cmd_len, smp_cmd_size_per_spec[cmd_code]);
1006    return false;
1007  }
1008
1009  return true;
1010}
1011
1012/*******************************************************************************
1013 *
1014 * Function         smp_pairing_request_response_parameters_are_valid
1015 *
1016 * Description      Validates parameter ranges in the received SMP command
1017 *                  pairing request or pairing response.
1018 *                  The parameters to validate:
1019 *                  IO capability,
1020 *                  OOB data flag,
1021 *                  Bonding_flags in AuthReq
1022 *                  Maximum encryption key size.
1023 *                  Returns false if at least one of these parameters is out of
1024 *                  range.
1025 *
1026 ******************************************************************************/
1027bool smp_pairing_request_response_parameters_are_valid(tSMP_CB* p_cb) {
1028  uint8_t io_caps = p_cb->peer_io_caps;
1029  uint8_t oob_flag = p_cb->peer_oob_flag;
1030  uint8_t bond_flag =
1031      p_cb->peer_auth_req & 0x03;  // 0x03 is gen bond with appropriate mask
1032  uint8_t enc_size = p_cb->peer_enc_size;
1033
1034  SMP_TRACE_DEBUG("%s for cmd code 0x%02x", __func__, p_cb->rcvd_cmd_code);
1035
1036  if (io_caps >= BTM_IO_CAP_MAX) {
1037    SMP_TRACE_WARNING(
1038        "Rcvd from the peer cmd 0x%02x with IO Capability "
1039        "value (0x%02x) out of range).",
1040        p_cb->rcvd_cmd_code, io_caps);
1041    return false;
1042  }
1043
1044  if (!((oob_flag == SMP_OOB_NONE) || (oob_flag == SMP_OOB_PRESENT))) {
1045    SMP_TRACE_WARNING(
1046        "Rcvd from the peer cmd 0x%02x with OOB data flag value "
1047        "(0x%02x) out of range).",
1048        p_cb->rcvd_cmd_code, oob_flag);
1049    return false;
1050  }
1051
1052  if (!((bond_flag == SMP_AUTH_NO_BOND) || (bond_flag == SMP_AUTH_BOND))) {
1053    SMP_TRACE_WARNING(
1054        "Rcvd from the peer cmd 0x%02x with Bonding_Flags value (0x%02x) "
1055        "out of range).",
1056        p_cb->rcvd_cmd_code, bond_flag);
1057    return false;
1058  }
1059
1060  if ((enc_size < SMP_ENCR_KEY_SIZE_MIN) ||
1061      (enc_size > SMP_ENCR_KEY_SIZE_MAX)) {
1062    SMP_TRACE_WARNING(
1063        "Rcvd from the peer cmd 0x%02x with Maximum Encryption "
1064        "Key value (0x%02x) out of range).",
1065        p_cb->rcvd_cmd_code, enc_size);
1066    return false;
1067  }
1068
1069  return true;
1070}
1071
1072/*******************************************************************************
1073 *
1074 * Function         smp_pairing_keypress_notification_is_valid
1075 *
1076 * Description      Validates Notification Type parameter range in the received
1077 *                  SMP command pairing keypress notification.
1078 *                  Returns false if this parameter is out of range.
1079 *
1080 ******************************************************************************/
1081bool smp_pairing_keypress_notification_is_valid(tSMP_CB* p_cb) {
1082  tBTM_SP_KEY_TYPE keypress_notification = p_cb->peer_keypress_notification;
1083
1084  SMP_TRACE_DEBUG("%s for cmd code 0x%02x", __func__, p_cb->rcvd_cmd_code);
1085
1086  if (keypress_notification >= BTM_SP_KEY_OUT_OF_RANGE) {
1087    SMP_TRACE_WARNING(
1088        "Rcvd from the peer cmd 0x%02x with Pairing Keypress "
1089        "Notification value (0x%02x) out of range).",
1090        p_cb->rcvd_cmd_code, keypress_notification);
1091    return false;
1092  }
1093
1094  return true;
1095}
1096
1097/*******************************************************************************
1098 *
1099 * Function         smp_parameter_unconditionally_valid
1100 *
1101 * Description      Always returns true.
1102 *
1103 ******************************************************************************/
1104bool smp_parameter_unconditionally_valid(UNUSED_ATTR tSMP_CB* p_cb) {
1105  return true;
1106}
1107
1108/*******************************************************************************
1109 *
1110 * Function         smp_parameter_unconditionally_invalid
1111 *
1112 * Description      Always returns false.
1113 *
1114 ******************************************************************************/
1115bool smp_parameter_unconditionally_invalid(UNUSED_ATTR tSMP_CB* p_cb) {
1116  return false;
1117}
1118
1119/*******************************************************************************
1120 *
1121 * Function         smp_reject_unexpected_pairing_command
1122 *
1123 * Description      send pairing failure to an unexpected pairing command during
1124 *                  an active pairing process.
1125 *
1126 * Returns          void
1127 *
1128 ******************************************************************************/
1129void smp_reject_unexpected_pairing_command(const RawAddress& bd_addr) {
1130  uint8_t* p;
1131  BT_HDR* p_buf = (BT_HDR*)osi_malloc(sizeof(BT_HDR) + SMP_PAIR_FAIL_SIZE +
1132                                      L2CAP_MIN_OFFSET);
1133
1134  SMP_TRACE_DEBUG("%s", __func__);
1135
1136  p = (uint8_t*)(p_buf + 1) + L2CAP_MIN_OFFSET;
1137  UINT8_TO_STREAM(p, SMP_OPCODE_PAIRING_FAILED);
1138  UINT8_TO_STREAM(p, SMP_PAIR_NOT_SUPPORT);
1139
1140  p_buf->offset = L2CAP_MIN_OFFSET;
1141  p_buf->len = SMP_PAIR_FAIL_SIZE;
1142
1143  smp_send_msg_to_L2CAP(bd_addr, p_buf);
1144}
1145
1146/*******************************************************************************
1147 * Function         smp_select_association_model
1148 *
1149 * Description      This function selects association model to use for STK
1150 *                  generation. Selection is based on both sides' io capability,
1151 *                  oob data flag and authentication request.
1152 *
1153 * Note             If Secure Connections Only mode is required locally then we
1154 *                  come to this point only if both sides support Secure
1155 *                  Connections mode, i.e.
1156 *                  if p_cb->secure_connections_only_mode_required = true
1157 *                  then we come to this point only if
1158 *                      (p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) ==
1159 *                      (p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT) ==
1160 *                      SMP_SC_SUPPORT_BIT
1161 *
1162 ******************************************************************************/
1163tSMP_ASSO_MODEL smp_select_association_model(tSMP_CB* p_cb) {
1164  tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;
1165  p_cb->le_secure_connections_mode_is_used = false;
1166
1167  SMP_TRACE_EVENT("%s", __func__);
1168  SMP_TRACE_DEBUG("%s p_cb->peer_io_caps = %d p_cb->local_io_capability = %d",
1169                  __func__, p_cb->peer_io_caps, p_cb->local_io_capability);
1170  SMP_TRACE_DEBUG("%s p_cb->peer_oob_flag = %d p_cb->loc_oob_flag = %d",
1171                  __func__, p_cb->peer_oob_flag, p_cb->loc_oob_flag);
1172  SMP_TRACE_DEBUG("%s p_cb->peer_auth_req = 0x%02x p_cb->loc_auth_req = 0x%02x",
1173                  __func__, p_cb->peer_auth_req, p_cb->loc_auth_req);
1174  SMP_TRACE_DEBUG(
1175      "%s p_cb->secure_connections_only_mode_required = %s", __func__,
1176      p_cb->secure_connections_only_mode_required ? "true" : "false");
1177
1178  if ((p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) &&
1179      (p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT)) {
1180    p_cb->le_secure_connections_mode_is_used = true;
1181  }
1182
1183  if ((p_cb->peer_auth_req & SMP_H7_SUPPORT_BIT) &&
1184      (p_cb->loc_auth_req & SMP_H7_SUPPORT_BIT)) {
1185    p_cb->key_derivation_h7_used = TRUE;
1186  }
1187
1188  SMP_TRACE_DEBUG("use_sc_process = %d, h7 use = %d",
1189                  p_cb->le_secure_connections_mode_is_used,
1190                  p_cb->key_derivation_h7_used);
1191
1192  if (p_cb->le_secure_connections_mode_is_used) {
1193    model = smp_select_association_model_secure_connections(p_cb);
1194  } else {
1195    model = smp_select_legacy_association_model(p_cb);
1196  }
1197  return model;
1198}
1199
1200/*******************************************************************************
1201 * Function         smp_select_legacy_association_model
1202 *
1203 * Description      This function is called to select association mode if at
1204 *                  least one side doesn't support secure connections.
1205 *
1206 ******************************************************************************/
1207tSMP_ASSO_MODEL smp_select_legacy_association_model(tSMP_CB* p_cb) {
1208  tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;
1209
1210  SMP_TRACE_DEBUG("%s", __func__);
1211  /* if OOB data is present on both devices, then use OOB association model */
1212  if (p_cb->peer_oob_flag == SMP_OOB_PRESENT &&
1213      p_cb->loc_oob_flag == SMP_OOB_PRESENT)
1214    return SMP_MODEL_OOB;
1215
1216  /* else if neither device requires MITM, then use Just Works association model
1217   */
1218  if (SMP_NO_MITM_REQUIRED(p_cb->peer_auth_req) &&
1219      SMP_NO_MITM_REQUIRED(p_cb->loc_auth_req))
1220    return SMP_MODEL_ENCRYPTION_ONLY;
1221
1222  /* otherwise use IO capability to select association model */
1223  if (p_cb->peer_io_caps < SMP_IO_CAP_MAX &&
1224      p_cb->local_io_capability < SMP_IO_CAP_MAX) {
1225    if (p_cb->role == HCI_ROLE_MASTER) {
1226      model = smp_association_table[p_cb->role][p_cb->peer_io_caps]
1227                                   [p_cb->local_io_capability];
1228    } else {
1229      model = smp_association_table[p_cb->role][p_cb->local_io_capability]
1230                                   [p_cb->peer_io_caps];
1231    }
1232  }
1233
1234  return model;
1235}
1236
1237/*******************************************************************************
1238 * Function         smp_select_association_model_secure_connections
1239 *
1240 * Description      This function is called to select association mode if both
1241 *                  sides support secure connections.
1242 *
1243 ******************************************************************************/
1244tSMP_ASSO_MODEL smp_select_association_model_secure_connections(tSMP_CB* p_cb) {
1245  tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;
1246
1247  SMP_TRACE_DEBUG("%s", __func__);
1248  /* if OOB data is present on at least one device, then use OOB association
1249   * model */
1250  if (p_cb->peer_oob_flag == SMP_OOB_PRESENT ||
1251      p_cb->loc_oob_flag == SMP_OOB_PRESENT)
1252    return SMP_MODEL_SEC_CONN_OOB;
1253
1254  /* else if neither device requires MITM, then use Just Works association model
1255   */
1256  if (SMP_NO_MITM_REQUIRED(p_cb->peer_auth_req) &&
1257      SMP_NO_MITM_REQUIRED(p_cb->loc_auth_req))
1258    return SMP_MODEL_SEC_CONN_JUSTWORKS;
1259
1260  /* otherwise use IO capability to select association model */
1261  if (p_cb->peer_io_caps < SMP_IO_CAP_MAX &&
1262      p_cb->local_io_capability < SMP_IO_CAP_MAX) {
1263    if (p_cb->role == HCI_ROLE_MASTER) {
1264      model = smp_association_table_sc[p_cb->role][p_cb->peer_io_caps]
1265                                      [p_cb->local_io_capability];
1266    } else {
1267      model = smp_association_table_sc[p_cb->role][p_cb->local_io_capability]
1268                                      [p_cb->peer_io_caps];
1269    }
1270  }
1271
1272  return model;
1273}
1274
1275/*******************************************************************************
1276 * Function         smp_reverse_array
1277 *
1278 * Description      This function reverses array bytes
1279 *
1280 ******************************************************************************/
1281void smp_reverse_array(uint8_t* arr, uint8_t len) {
1282  uint8_t i = 0, tmp;
1283
1284  SMP_TRACE_DEBUG("smp_reverse_array");
1285
1286  for (i = 0; i < len / 2; i++) {
1287    tmp = arr[i];
1288    arr[i] = arr[len - 1 - i];
1289    arr[len - 1 - i] = tmp;
1290  }
1291}
1292
1293/*******************************************************************************
1294 * Function         smp_calculate_random_input
1295 *
1296 * Description      This function returns random input value to be used in
1297 *                  commitment calculation for SC passkey entry association mode
1298 *                  (if bit["round"] in "random" array == 1 then returns 0x81
1299 *                   else returns 0x80).
1300 *
1301 * Returns          ri value
1302 *
1303 ******************************************************************************/
1304uint8_t smp_calculate_random_input(uint8_t* random, uint8_t round) {
1305  uint8_t i = round / 8;
1306  uint8_t j = round % 8;
1307  uint8_t ri;
1308
1309  SMP_TRACE_DEBUG("random: 0x%02x, round: %d, i: %d, j: %d", random[i], round,
1310                  i, j);
1311  ri = ((random[i] >> j) & 1) | 0x80;
1312  SMP_TRACE_DEBUG("%s ri=0x%02x", __func__, ri);
1313  return ri;
1314}
1315
1316/*******************************************************************************
1317 * Function         smp_collect_local_io_capabilities
1318 *
1319 * Description      This function puts into IOcap array local device
1320 *                  IOCapability, OOB data, AuthReq.
1321 *
1322 * Returns          void
1323 *
1324 ******************************************************************************/
1325void smp_collect_local_io_capabilities(uint8_t* iocap, tSMP_CB* p_cb) {
1326  SMP_TRACE_DEBUG("%s", __func__);
1327
1328  iocap[0] = p_cb->local_io_capability;
1329  iocap[1] = p_cb->loc_oob_flag;
1330  iocap[2] = p_cb->loc_auth_req;
1331}
1332
1333/*******************************************************************************
1334 * Function         smp_collect_peer_io_capabilities
1335 *
1336 * Description      This function puts into IOcap array peer device
1337 *                  IOCapability, OOB data, AuthReq.
1338 *
1339 * Returns          void
1340 *
1341 ******************************************************************************/
1342void smp_collect_peer_io_capabilities(uint8_t* iocap, tSMP_CB* p_cb) {
1343  SMP_TRACE_DEBUG("%s", __func__);
1344
1345  iocap[0] = p_cb->peer_io_caps;
1346  iocap[1] = p_cb->peer_oob_flag;
1347  iocap[2] = p_cb->peer_auth_req;
1348}
1349
1350/*******************************************************************************
1351 * Function         smp_collect_local_ble_address
1352 *
1353 * Description      Put the the local device LE address into the le_addr array:
1354 *                  le_addr[0-5] = local BD ADDR,
1355 *                  le_addr[6] = local le address type (PUBLIC/RANDOM).
1356 *
1357 * Returns          void
1358 *
1359 ******************************************************************************/
1360void smp_collect_local_ble_address(uint8_t* le_addr, tSMP_CB* p_cb) {
1361  tBLE_ADDR_TYPE addr_type = 0;
1362  RawAddress bda;
1363  uint8_t* p = le_addr;
1364
1365  SMP_TRACE_DEBUG("%s", __func__);
1366
1367  BTM_ReadConnectionAddr(p_cb->pairing_bda, bda, &addr_type);
1368  BDADDR_TO_STREAM(p, bda);
1369  UINT8_TO_STREAM(p, addr_type);
1370}
1371
1372/*******************************************************************************
1373 * Function         smp_collect_peer_ble_address
1374 *
1375 * Description      Put the peer device LE addr into the le_addr array:
1376 *                  le_addr[0-5] = peer BD ADDR,
1377 *                  le_addr[6] = peer le address type (PUBLIC/RANDOM).
1378 *
1379 * Returns          void
1380 *
1381 ******************************************************************************/
1382void smp_collect_peer_ble_address(uint8_t* le_addr, tSMP_CB* p_cb) {
1383  tBLE_ADDR_TYPE addr_type = 0;
1384  RawAddress bda;
1385  uint8_t* p = le_addr;
1386
1387  SMP_TRACE_DEBUG("%s", __func__);
1388
1389  if (!BTM_ReadRemoteConnectionAddr(p_cb->pairing_bda, bda, &addr_type)) {
1390    SMP_TRACE_ERROR(
1391        "can not collect peer le addr information for unknown device");
1392    return;
1393  }
1394
1395  BDADDR_TO_STREAM(p, bda);
1396  UINT8_TO_STREAM(p, addr_type);
1397}
1398
1399/*******************************************************************************
1400 * Function         smp_check_commitment
1401 *
1402 * Description      This function compares peer commitment values:
1403 *                  - expected (i.e. calculated locally),
1404 *                  - received from the peer.
1405 *
1406 * Returns          true  if the values are the same
1407 *                  false otherwise
1408 *
1409 ******************************************************************************/
1410bool smp_check_commitment(tSMP_CB* p_cb) {
1411  BT_OCTET16 expected;
1412
1413  SMP_TRACE_DEBUG("%s", __func__);
1414
1415  smp_calculate_peer_commitment(p_cb, expected);
1416  print128(expected, (const uint8_t*)"calculated peer commitment");
1417  print128(p_cb->remote_commitment, (const uint8_t*)"received peer commitment");
1418
1419  if (memcmp(p_cb->remote_commitment, expected, BT_OCTET16_LEN)) {
1420    SMP_TRACE_WARNING("%s: Commitment check fails", __func__);
1421    return false;
1422  }
1423
1424  SMP_TRACE_DEBUG("%s: Commitment check succeeds", __func__);
1425  return true;
1426}
1427
1428/*******************************************************************************
1429 *
1430 * Function         smp_save_secure_connections_long_term_key
1431 *
1432 * Description      The function saves SC LTK as BLE key for future use as local
1433 *                  and/or peer key.
1434 *
1435 * Returns          void
1436 *
1437 ******************************************************************************/
1438void smp_save_secure_connections_long_term_key(tSMP_CB* p_cb) {
1439  tBTM_LE_LENC_KEYS lle_key;
1440  tBTM_LE_PENC_KEYS ple_key;
1441
1442  SMP_TRACE_DEBUG("%s-Save LTK as local LTK key", __func__);
1443  memcpy(lle_key.ltk, p_cb->ltk, BT_OCTET16_LEN);
1444  lle_key.div = 0;
1445  lle_key.key_size = p_cb->loc_enc_size;
1446  lle_key.sec_level = p_cb->sec_level;
1447  btm_sec_save_le_key(p_cb->pairing_bda, BTM_LE_KEY_LENC,
1448                      (tBTM_LE_KEY_VALUE*)&lle_key, true);
1449
1450  SMP_TRACE_DEBUG("%s-Save LTK as peer LTK key", __func__);
1451  ple_key.ediv = 0;
1452  memset(ple_key.rand, 0, BT_OCTET8_LEN);
1453  memcpy(ple_key.ltk, p_cb->ltk, BT_OCTET16_LEN);
1454  ple_key.sec_level = p_cb->sec_level;
1455  ple_key.key_size = p_cb->loc_enc_size;
1456  btm_sec_save_le_key(p_cb->pairing_bda, BTM_LE_KEY_PENC,
1457                      (tBTM_LE_KEY_VALUE*)&ple_key, true);
1458}
1459
1460/*******************************************************************************
1461 *
1462 * Function         smp_calculate_f5_mackey_and_long_term_key
1463 *
1464 * Description      The function calculates MacKey and LTK and saves them in CB.
1465 *                  To calculate MacKey and LTK it calls smp_calc_f5(...).
1466 *                  MacKey is used in dhkey calculation, LTK is used to encrypt
1467 *                  the link.
1468 *
1469 * Returns          false if out of resources, true otherwise.
1470 *
1471 ******************************************************************************/
1472bool smp_calculate_f5_mackey_and_long_term_key(tSMP_CB* p_cb) {
1473  uint8_t a[7];
1474  uint8_t b[7];
1475  uint8_t* p_na;
1476  uint8_t* p_nb;
1477
1478  SMP_TRACE_DEBUG("%s", __func__);
1479
1480  if (p_cb->role == HCI_ROLE_MASTER) {
1481    smp_collect_local_ble_address(a, p_cb);
1482    smp_collect_peer_ble_address(b, p_cb);
1483    p_na = p_cb->rand;
1484    p_nb = p_cb->rrand;
1485  } else {
1486    smp_collect_local_ble_address(b, p_cb);
1487    smp_collect_peer_ble_address(a, p_cb);
1488    p_na = p_cb->rrand;
1489    p_nb = p_cb->rand;
1490  }
1491
1492  if (!smp_calculate_f5(p_cb->dhkey, p_na, p_nb, a, b, p_cb->mac_key,
1493                        p_cb->ltk)) {
1494    SMP_TRACE_ERROR("%s failed", __func__);
1495    return false;
1496  }
1497
1498  SMP_TRACE_EVENT("%s is completed", __func__);
1499  return true;
1500}
1501
1502/*******************************************************************************
1503 *
1504 * Function         smp_request_oob_data
1505 *
1506 * Description      Requests application to provide OOB data.
1507 *
1508 * Returns          true - OOB data has to be provided by application
1509 *                  false - otherwise (unexpected)
1510 *
1511 ******************************************************************************/
1512bool smp_request_oob_data(tSMP_CB* p_cb) {
1513  tSMP_OOB_DATA_TYPE req_oob_type = SMP_OOB_INVALID_TYPE;
1514
1515  SMP_TRACE_DEBUG("%s", __func__);
1516
1517  if (p_cb->peer_oob_flag == SMP_OOB_PRESENT &&
1518      p_cb->loc_oob_flag == SMP_OOB_PRESENT) {
1519    /* both local and peer rcvd data OOB */
1520    req_oob_type = SMP_OOB_BOTH;
1521  } else if (p_cb->peer_oob_flag == SMP_OOB_PRESENT) {
1522    /* peer rcvd OOB local data, local didn't receive OOB peer data */
1523    req_oob_type = SMP_OOB_LOCAL;
1524  } else if (p_cb->loc_oob_flag == SMP_OOB_PRESENT) {
1525    req_oob_type = SMP_OOB_PEER;
1526  }
1527
1528  SMP_TRACE_DEBUG("req_oob_type = %d", req_oob_type);
1529
1530  if (req_oob_type == SMP_OOB_INVALID_TYPE) return false;
1531
1532  p_cb->req_oob_type = req_oob_type;
1533  p_cb->cb_evt = SMP_SC_OOB_REQ_EVT;
1534  tSMP_INT_DATA smp_int_data;
1535  smp_int_data.req_oob_type = req_oob_type;
1536  smp_sm_event(p_cb, SMP_TK_REQ_EVT, &smp_int_data);
1537
1538  return true;
1539}
1540