/******************************************************************************
*
* Copyright (C) 1999-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* This file contains functions for the SMP L2CAP utility functions
*
******************************************************************************/
#include "bt_target.h"
#if SMP_INCLUDED == TRUE
#include "bt_types.h"
#include "bt_utils.h"
#include <string.h>
#include <ctype.h>
#include "hcidefs.h"
#include "btm_ble_api.h"
#include "l2c_api.h"
#include "l2c_int.h"
#include "smp_int.h"
#include "device/include/controller.h"
#include "btm_int.h"
#define SMP_PAIRING_REQ_SIZE 7
#define SMP_CONFIRM_CMD_SIZE (BT_OCTET16_LEN + 1)
#define SMP_RAND_CMD_SIZE (BT_OCTET16_LEN + 1)
#define SMP_INIT_CMD_SIZE (BT_OCTET16_LEN + 1)
#define SMP_ENC_INFO_SIZE (BT_OCTET16_LEN + 1)
#define SMP_MASTER_ID_SIZE (BT_OCTET8_LEN + 2 + 1)
#define SMP_ID_INFO_SIZE (BT_OCTET16_LEN + 1)
#define SMP_ID_ADDR_SIZE (BD_ADDR_LEN + 1 + 1)
#define SMP_SIGN_INFO_SIZE (BT_OCTET16_LEN + 1)
#define SMP_PAIR_FAIL_SIZE 2
#define SMP_SECURITY_REQUEST_SIZE 2
#define SMP_PAIR_PUBL_KEY_SIZE (1 /* opcode */ + (2*BT_OCTET32_LEN))
#define SMP_PAIR_COMMITM_SIZE (1 /* opcode */ + BT_OCTET16_LEN /*Commitment*/)
#define SMP_PAIR_DHKEY_CHECK_SIZE (1 /* opcode */ + BT_OCTET16_LEN /*DHKey Check*/)
#define SMP_PAIR_KEYPR_NOTIF_SIZE (1 /* opcode */ + 1 /*Notif Type*/)
/* SMP command sizes per spec */
static const UINT8 smp_cmd_size_per_spec[] =
{
0,
SMP_PAIRING_REQ_SIZE, /* 0x01: pairing request */
SMP_PAIRING_REQ_SIZE, /* 0x02: pairing response */
SMP_CONFIRM_CMD_SIZE, /* 0x03: pairing confirm */
SMP_RAND_CMD_SIZE, /* 0x04: pairing random */
SMP_PAIR_FAIL_SIZE, /* 0x05: pairing failed */
SMP_ENC_INFO_SIZE, /* 0x06: encryption information */
SMP_MASTER_ID_SIZE, /* 0x07: master identification */
SMP_ID_INFO_SIZE, /* 0x08: identity information */
SMP_ID_ADDR_SIZE, /* 0x09: identity address information */
SMP_SIGN_INFO_SIZE, /* 0x0A: signing information */
SMP_SECURITY_REQUEST_SIZE, /* 0x0B: security request */
SMP_PAIR_PUBL_KEY_SIZE, /* 0x0C: pairing public key */
SMP_PAIR_DHKEY_CHECK_SIZE, /* 0x0D: pairing dhkey check */
SMP_PAIR_KEYPR_NOTIF_SIZE, /* 0x0E: pairing keypress notification */
SMP_PAIR_COMMITM_SIZE /* 0x0F: pairing commitment */
};
static BOOLEAN smp_parameter_unconditionally_valid(tSMP_CB *p_cb);
static BOOLEAN smp_parameter_unconditionally_invalid(tSMP_CB *p_cb);
/* type for SMP command length validation functions */
typedef BOOLEAN (*tSMP_CMD_LEN_VALID)(tSMP_CB *p_cb);
static BOOLEAN smp_command_has_valid_fixed_length(tSMP_CB *p_cb);
static const tSMP_CMD_LEN_VALID smp_cmd_len_is_valid[] =
{
smp_parameter_unconditionally_invalid,
smp_command_has_valid_fixed_length, /* 0x01: pairing request */
smp_command_has_valid_fixed_length, /* 0x02: pairing response */
smp_command_has_valid_fixed_length, /* 0x03: pairing confirm */
smp_command_has_valid_fixed_length, /* 0x04: pairing random */
smp_command_has_valid_fixed_length, /* 0x05: pairing failed */
smp_command_has_valid_fixed_length, /* 0x06: encryption information */
smp_command_has_valid_fixed_length, /* 0x07: master identification */
smp_command_has_valid_fixed_length, /* 0x08: identity information */
smp_command_has_valid_fixed_length, /* 0x09: identity address information */
smp_command_has_valid_fixed_length, /* 0x0A: signing information */
smp_command_has_valid_fixed_length, /* 0x0B: security request */
smp_command_has_valid_fixed_length, /* 0x0C: pairing public key */
smp_command_has_valid_fixed_length, /* 0x0D: pairing dhkey check */
smp_command_has_valid_fixed_length, /* 0x0E: pairing keypress notification */
smp_command_has_valid_fixed_length /* 0x0F: pairing commitment */
};
/* type for SMP command parameter ranges validation functions */
typedef BOOLEAN (*tSMP_CMD_PARAM_RANGES_VALID)(tSMP_CB *p_cb);
static BOOLEAN smp_pairing_request_response_parameters_are_valid(tSMP_CB *p_cb);
static BOOLEAN smp_pairing_keypress_notification_is_valid(tSMP_CB *p_cb);
static const tSMP_CMD_PARAM_RANGES_VALID smp_cmd_param_ranges_are_valid[] =
{
smp_parameter_unconditionally_invalid,
smp_pairing_request_response_parameters_are_valid, /* 0x01: pairing request */
smp_pairing_request_response_parameters_are_valid, /* 0x02: pairing response */
smp_parameter_unconditionally_valid, /* 0x03: pairing confirm */
smp_parameter_unconditionally_valid, /* 0x04: pairing random */
smp_parameter_unconditionally_valid, /* 0x05: pairing failed */
smp_parameter_unconditionally_valid, /* 0x06: encryption information */
smp_parameter_unconditionally_valid, /* 0x07: master identification */
smp_parameter_unconditionally_valid, /* 0x08: identity information */
smp_parameter_unconditionally_valid, /* 0x09: identity address information */
smp_parameter_unconditionally_valid, /* 0x0A: signing information */
smp_parameter_unconditionally_valid, /* 0x0B: security request */
smp_parameter_unconditionally_valid, /* 0x0C: pairing public key */
smp_parameter_unconditionally_valid, /* 0x0D: pairing dhkey check */
smp_pairing_keypress_notification_is_valid, /* 0x0E: pairing keypress notification */
smp_parameter_unconditionally_valid /* 0x0F: pairing commitment */
};
/* type for action functions */
typedef BT_HDR * (*tSMP_CMD_ACT)(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pairing_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_confirm_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_rand_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pairing_fail(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_identity_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_encrypt_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_security_request(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_signing_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_master_id_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_id_addr_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pair_public_key_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pairing_commitment_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pair_dhkey_check_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static BT_HDR *smp_build_pairing_keypress_notification_cmd(UINT8 cmd_code, tSMP_CB *p_cb);
static const tSMP_CMD_ACT smp_cmd_build_act[] =
{
NULL,
smp_build_pairing_cmd, /* 0x01: pairing request */
smp_build_pairing_cmd, /* 0x02: pairing response */
smp_build_confirm_cmd, /* 0x03: pairing confirm */
smp_build_rand_cmd, /* 0x04: pairing random */
smp_build_pairing_fail, /* 0x05: pairing failure */
smp_build_encrypt_info_cmd, /* 0x06: encryption information */
smp_build_master_id_cmd, /* 0x07: master identification */
smp_build_identity_info_cmd, /* 0x08: identity information */
smp_build_id_addr_cmd, /* 0x09: identity address information */
smp_build_signing_info_cmd, /* 0x0A: signing information */
smp_build_security_request, /* 0x0B: security request */
smp_build_pair_public_key_cmd, /* 0x0C: pairing public key */
smp_build_pair_dhkey_check_cmd, /* 0x0D: pairing DHKey check */
smp_build_pairing_keypress_notification_cmd, /* 0x0E: pairing keypress notification */
smp_build_pairing_commitment_cmd /* 0x0F: pairing commitment */
};
static const UINT8 smp_association_table[2][SMP_IO_CAP_MAX][SMP_IO_CAP_MAX] =
{
/* display only */ /* Display Yes/No */ /* keyboard only */
/* No Input/Output */ /* keyboard display */
/* initiator */
/* model = tbl[peer_io_caps][loc_io_caps] */
/* Display Only */
{{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY},
/* Display Yes/No */
{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY},
/* Keyboard only */
{SMP_MODEL_KEY_NOTIF, SMP_MODEL_KEY_NOTIF, SMP_MODEL_PASSKEY,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF},
/* No Input No Output */
{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY},
/* keyboard display */
{SMP_MODEL_KEY_NOTIF, SMP_MODEL_KEY_NOTIF, SMP_MODEL_PASSKEY,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF}},
/* responder */
/* model = tbl[loc_io_caps][peer_io_caps] */
/* Display Only */
{{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF},
/* Display Yes/No */
{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_KEY_NOTIF},
/* keyboard only */
{SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY},
/* No Input No Output */
{SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_ENCRYPTION_ONLY},
/* keyboard display */
{SMP_MODEL_PASSKEY, SMP_MODEL_PASSKEY, SMP_MODEL_KEY_NOTIF,
SMP_MODEL_ENCRYPTION_ONLY, SMP_MODEL_PASSKEY}}
};
static const UINT8 smp_association_table_sc[2][SMP_IO_CAP_MAX][SMP_IO_CAP_MAX] =
{
/* display only */ /* Display Yes/No */ /* keyboard only */
/* No InputOutput */ /* keyboard display */
/* initiator */
/* model = tbl[peer_io_caps][loc_io_caps] */
/* Display Only */
{{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_ENT},
/* Display Yes/No */
{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP},
/* keyboard only */
{SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_DISP},
/* No Input No Output */
{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS},
/* keyboard display */
{SMP_MODEL_SEC_CONN_PASSKEY_DISP, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP}},
/* responder */
/* model = tbl[loc_io_caps][peer_io_caps] */
/* Display Only */
{{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_DISP,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_DISP},
/* Display Yes/No */
{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_DISP,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP},
/* keyboard only */
{SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_PASSKEY_ENT,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_PASSKEY_ENT},
/* No Input No Output */
{SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_JUSTWORKS},
/* keyboard display */
{SMP_MODEL_SEC_CONN_PASSKEY_ENT, SMP_MODEL_SEC_CONN_NUM_COMP, SMP_MODEL_SEC_CONN_PASSKEY_DISP,
SMP_MODEL_SEC_CONN_JUSTWORKS, SMP_MODEL_SEC_CONN_NUM_COMP}}
};
static tSMP_ASSO_MODEL smp_select_legacy_association_model(tSMP_CB *p_cb);
static tSMP_ASSO_MODEL smp_select_association_model_secure_connections(tSMP_CB *p_cb);
/*******************************************************************************
**
** Function smp_send_msg_to_L2CAP
**
** Description Send message to L2CAP.
**
*******************************************************************************/
BOOLEAN smp_send_msg_to_L2CAP(BD_ADDR rem_bda, BT_HDR *p_toL2CAP)
{
UINT16 l2cap_ret;
UINT16 fixed_cid = L2CAP_SMP_CID;
if (smp_cb.smp_over_br)
{
fixed_cid = L2CAP_SMP_BR_CID;
}
SMP_TRACE_EVENT("%s", __FUNCTION__);
smp_cb.total_tx_unacked += 1;
if ((l2cap_ret = L2CA_SendFixedChnlData (fixed_cid, rem_bda, p_toL2CAP)) == L2CAP_DW_FAILED)
{
smp_cb.total_tx_unacked -= 1;
SMP_TRACE_ERROR("SMP failed to pass msg:0x%0x to L2CAP",
*((UINT8 *)(p_toL2CAP + 1) + p_toL2CAP->offset));
return FALSE;
}
else
return TRUE;
}
/*******************************************************************************
**
** Function smp_send_cmd
**
** Description send a SMP command on L2CAP channel.
**
*******************************************************************************/
BOOLEAN smp_send_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf;
BOOLEAN sent = FALSE;
UINT8 failure = SMP_PAIR_INTERNAL_ERR;
SMP_TRACE_EVENT("smp_send_cmd on l2cap cmd_code=0x%x", cmd_code);
if ( cmd_code <= (SMP_OPCODE_MAX + 1 /* for SMP_OPCODE_PAIR_COMMITM */) &&
smp_cmd_build_act[cmd_code] != NULL)
{
p_buf = (*smp_cmd_build_act[cmd_code])(cmd_code, p_cb);
if (p_buf != NULL &&
smp_send_msg_to_L2CAP(p_cb->pairing_bda, p_buf))
{
sent = TRUE;
btu_stop_timer (&p_cb->rsp_timer_ent);
btu_start_timer (&p_cb->rsp_timer_ent, BTU_TTYPE_SMP_PAIRING_CMD,
SMP_WAIT_FOR_RSP_TOUT);
}
}
if (!sent)
{
if (p_cb->smp_over_br)
{
smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &failure);
}
else
{
smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &failure);
}
}
return sent;
}
/*******************************************************************************
**
** Function smp_rsp_timeout
**
** Description Called when SMP wait for SMP command response timer expires
**
** Returns void
**
*******************************************************************************/
void smp_rsp_timeout(TIMER_LIST_ENT *p_tle)
{
tSMP_CB *p_cb = &smp_cb;
UINT8 failure = SMP_RSP_TIMEOUT;
UNUSED(p_tle);
SMP_TRACE_EVENT("%s state:%d br_state:%d", __FUNCTION__, p_cb->state, p_cb->br_state);
if (p_cb->smp_over_br)
{
smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &failure);
}
else
{
smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &failure);
}
}
/*******************************************************************************
**
** Function smp_build_pairing_req_cmd
**
** Description Build pairing request command.
**
*******************************************************************************/
BT_HDR * smp_build_pairing_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
SMP_TRACE_EVENT("smp_build_pairing_cmd");
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_PAIRING_REQ_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, cmd_code);
UINT8_TO_STREAM (p, p_cb->local_io_capability);
UINT8_TO_STREAM (p, p_cb->loc_oob_flag);
UINT8_TO_STREAM (p, p_cb->loc_auth_req);
UINT8_TO_STREAM (p, p_cb->loc_enc_size);
UINT8_TO_STREAM (p, p_cb->local_i_key);
UINT8_TO_STREAM (p, p_cb->local_r_key);
p_buf->offset = L2CAP_MIN_OFFSET;
/* 1B ERR_RSP op code + 1B cmd_op_code + 2B handle + 1B status */
p_buf->len = SMP_PAIRING_REQ_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_confirm_cmd
**
** Description Build confirm request command.
**
*******************************************************************************/
static BT_HDR * smp_build_confirm_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("smp_build_confirm_cmd");
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_CONFIRM_CMD_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_CONFIRM);
ARRAY_TO_STREAM (p, p_cb->confirm, BT_OCTET16_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_CONFIRM_CMD_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_rand_cmd
**
** Description Build Random command.
**
*******************************************************************************/
static BT_HDR * smp_build_rand_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __func__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_RAND_CMD_SIZE + L2CAP_MIN_OFFSET))
!= NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_RAND);
ARRAY_TO_STREAM (p, p_cb->rand, BT_OCTET16_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_RAND_CMD_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_encrypt_info_cmd
**
** Description Build security information command.
**
*******************************************************************************/
static BT_HDR * smp_build_encrypt_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("smp_build_encrypt_info_cmd");
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_ENC_INFO_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_ENCRYPT_INFO);
ARRAY_TO_STREAM (p, p_cb->ltk, BT_OCTET16_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_ENC_INFO_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_master_id_cmd
**
** Description Build security information command.
**
*******************************************************************************/
static BT_HDR * smp_build_master_id_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __func__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_MASTER_ID_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_MASTER_ID);
UINT16_TO_STREAM (p, p_cb->ediv);
ARRAY_TO_STREAM (p, p_cb->enc_rand, BT_OCTET8_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_MASTER_ID_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_identity_info_cmd
**
** Description Build identity information command.
**
*******************************************************************************/
static BT_HDR * smp_build_identity_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
BT_OCTET16 irk;
UNUSED(cmd_code);
UNUSED(p_cb);
SMP_TRACE_EVENT("smp_build_identity_info_cmd");
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_ID_INFO_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
BTM_GetDeviceIDRoot(irk);
UINT8_TO_STREAM (p, SMP_OPCODE_IDENTITY_INFO);
ARRAY_TO_STREAM (p, irk, BT_OCTET16_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_ID_INFO_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_id_addr_cmd
**
** Description Build identity address information command.
**
*******************************************************************************/
static BT_HDR * smp_build_id_addr_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
UNUSED(cmd_code);
UNUSED(p_cb);
SMP_TRACE_EVENT("smp_build_id_addr_cmd");
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_ID_ADDR_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_ID_ADDR);
UINT8_TO_STREAM (p, 0);
BDADDR_TO_STREAM (p, controller_get_interface()->get_address()->address);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_ID_ADDR_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_signing_info_cmd
**
** Description Build signing information command.
**
*******************************************************************************/
static BT_HDR * smp_build_signing_info_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("smp_build_signing_info_cmd");
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_SIGN_INFO_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_SIGN_INFO);
ARRAY_TO_STREAM (p, p_cb->csrk, BT_OCTET16_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_SIGN_INFO_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_pairing_fail
**
** Description Build Pairing Fail command.
**
*******************************************************************************/
static BT_HDR * smp_build_pairing_fail(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __func__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_PAIR_FAIL_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_PAIRING_FAILED);
UINT8_TO_STREAM (p, p_cb->failure);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_PAIR_FAIL_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_security_request
**
** Description Build security request command.
**
*******************************************************************************/
static BT_HDR *smp_build_security_request(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __func__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + 2 + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_SEC_REQ);
UINT8_TO_STREAM (p, p_cb->loc_auth_req);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_SECURITY_REQUEST_SIZE;
SMP_TRACE_EVENT("opcode=%d auth_req=0x%x",SMP_OPCODE_SEC_REQ, p_cb->loc_auth_req );
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_pair_public_key_cmd
**
** Description Build pairing public key command.
**
*******************************************************************************/
static BT_HDR *smp_build_pair_public_key_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UINT8 publ_key[2*BT_OCTET32_LEN];
UINT8 *p_publ_key = publ_key;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __FUNCTION__);
memcpy(p_publ_key, p_cb->loc_publ_key.x, BT_OCTET32_LEN);
memcpy(p_publ_key + BT_OCTET32_LEN, p_cb->loc_publ_key.y, BT_OCTET32_LEN);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) +
SMP_PAIR_PUBL_KEY_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_PAIR_PUBLIC_KEY);
ARRAY_TO_STREAM (p, p_publ_key, 2*BT_OCTET32_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_PAIR_PUBL_KEY_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_pairing_commitment_cmd
**
** Description Build pairing commitment command.
**
*******************************************************************************/
static BT_HDR *smp_build_pairing_commitment_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __func__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + SMP_PAIR_COMMITM_SIZE + L2CAP_MIN_OFFSET))
!= NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_CONFIRM);
ARRAY_TO_STREAM (p, p_cb->commitment, BT_OCTET16_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_PAIR_COMMITM_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_pair_dhkey_check_cmd
**
** Description Build pairing DHKey check command.
**
*******************************************************************************/
static BT_HDR *smp_build_pair_dhkey_check_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __FUNCTION__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) +
SMP_PAIR_DHKEY_CHECK_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_PAIR_DHKEY_CHECK);
ARRAY_TO_STREAM (p, p_cb->dhkey_check, BT_OCTET16_LEN);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_PAIR_DHKEY_CHECK_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_build_pairing_keypress_notification_cmd
**
** Description Build keypress notification command.
**
*******************************************************************************/
static BT_HDR * smp_build_pairing_keypress_notification_cmd(UINT8 cmd_code, tSMP_CB *p_cb)
{
BT_HDR *p_buf = NULL ;
UINT8 *p;
UNUSED(cmd_code);
SMP_TRACE_EVENT("%s", __FUNCTION__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR)\
+ SMP_PAIR_KEYPR_NOTIF_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_PAIR_KEYPR_NOTIF);
UINT8_TO_STREAM (p, p_cb->local_keypress_notification);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_PAIR_KEYPR_NOTIF_SIZE;
}
return p_buf;
}
/*******************************************************************************
**
** Function smp_convert_string_to_tk
**
** Description This function is called to convert a 6 to 16 digits numeric
** character string into SMP TK.
**
**
** Returns void
**
*******************************************************************************/
void smp_convert_string_to_tk(BT_OCTET16 tk, UINT32 passkey)
{
UINT8 *p = tk;
tSMP_KEY key;
SMP_TRACE_EVENT("smp_convert_string_to_tk");
UINT32_TO_STREAM(p, passkey);
key.key_type = SMP_KEY_TYPE_TK;
key.p_data = tk;
smp_sm_event(&smp_cb, SMP_KEY_READY_EVT, &key);
}
/*******************************************************************************
**
** Function smp_mask_enc_key
**
** Description This function is called to mask off the encryption key based
** on the maximum encryption key size.
**
**
** Returns void
**
*******************************************************************************/
void smp_mask_enc_key(UINT8 loc_enc_size, UINT8 * p_data)
{
SMP_TRACE_EVENT("smp_mask_enc_key");
if (loc_enc_size < BT_OCTET16_LEN)
{
for (; loc_enc_size < BT_OCTET16_LEN; loc_enc_size ++)
* (p_data + loc_enc_size) = 0;
}
return;
}
/*******************************************************************************
**
** Function smp_xor_128
**
** Description utility function to do an biteise exclusive-OR of two bit
** strings of the length of BT_OCTET16_LEN.
**
** Returns void
**
*******************************************************************************/
void smp_xor_128(BT_OCTET16 a, BT_OCTET16 b)
{
UINT8 i, *aa = a, *bb = b;
SMP_TRACE_EVENT("smp_xor_128");
for (i = 0; i < BT_OCTET16_LEN; i++)
{
aa[i] = aa[i] ^ bb[i];
}
}
/*******************************************************************************
**
** Function smp_cb_cleanup
**
** Description Clean up SMP control block
**
** Returns void
**
*******************************************************************************/
void smp_cb_cleanup(tSMP_CB *p_cb)
{
tSMP_CALLBACK *p_callback = p_cb->p_callback;
UINT8 trace_level = p_cb->trace_level;
SMP_TRACE_EVENT("smp_cb_cleanup");
memset(p_cb, 0, sizeof(tSMP_CB));
p_cb->p_callback = p_callback;
p_cb->trace_level = trace_level;
}
/*******************************************************************************
**
** Function smp_remove_fixed_channel
**
** Description This function is called to remove the fixed channel
**
** Returns void
**
*******************************************************************************/
void smp_remove_fixed_channel(tSMP_CB *p_cb)
{
SMP_TRACE_DEBUG("%s", __func__);
if (p_cb->smp_over_br)
L2CA_RemoveFixedChnl (L2CAP_SMP_BR_CID, p_cb->pairing_bda);
else
L2CA_RemoveFixedChnl (L2CAP_SMP_CID, p_cb->pairing_bda);
}
/*******************************************************************************
**
** Function smp_reset_control_value
**
** Description This function is called to reset the control block value when
** pairing procedure finished.
**
**
** Returns void
**
*******************************************************************************/
void smp_reset_control_value(tSMP_CB *p_cb)
{
SMP_TRACE_EVENT("smp_reset_control_value");
btu_stop_timer (&p_cb->rsp_timer_ent);
p_cb->flags = 0;
/* set the link idle timer to drop the link when pairing is done
usually service discovery will follow authentication complete, to avoid
racing condition for a link down/up, set link idle timer to be
SMP_LINK_TOUT_MIN to guarantee SMP key exchange */
L2CA_SetIdleTimeoutByBdAddr(p_cb->pairing_bda, SMP_LINK_TOUT_MIN, BT_TRANSPORT_LE);
/* We can tell L2CAP to remove the fixed channel (if it has one) */
smp_remove_fixed_channel(p_cb);
smp_cb_cleanup(p_cb);
}
/*******************************************************************************
**
** Function smp_proc_pairing_cmpl
**
** Description This function is called to process pairing complete
**
**
** Returns void
**
*******************************************************************************/
void smp_proc_pairing_cmpl(tSMP_CB *p_cb)
{
tSMP_EVT_DATA evt_data = {0};
tSMP_CALLBACK *p_callback = p_cb->p_callback;
BD_ADDR pairing_bda;
SMP_TRACE_DEBUG ("smp_proc_pairing_cmpl ");
evt_data.cmplt.reason = p_cb->status;
evt_data.cmplt.smp_over_br = p_cb->smp_over_br;
if (p_cb->status == SMP_SUCCESS)
evt_data.cmplt.sec_level = p_cb->sec_level;
evt_data.cmplt.is_pair_cancel = FALSE;
if (p_cb->is_pair_cancel)
evt_data.cmplt.is_pair_cancel = TRUE;
SMP_TRACE_DEBUG ("send SMP_COMPLT_EVT reason=0x%0x sec_level=0x%0x",
evt_data.cmplt.reason,
evt_data.cmplt.sec_level );
memcpy (pairing_bda, p_cb->pairing_bda, BD_ADDR_LEN);
smp_reset_control_value(p_cb);
if (p_callback)
(*p_callback) (SMP_COMPLT_EVT, pairing_bda, &evt_data);
}
/*******************************************************************************
**
** Function smp_command_has_invalid_parameters
**
** Description Checks if the received SMP command has invalid parameters i.e.
** if the command length is valid and the command parameters are
** inside specified range.
** It returns TRUE if the command has invalid parameters.
**
** Returns TRUE if the command has invalid parameters, FALSE otherwise.
**
*******************************************************************************/
BOOLEAN smp_command_has_invalid_parameters(tSMP_CB *p_cb)
{
UINT8 cmd_code = p_cb->rcvd_cmd_code;
SMP_TRACE_DEBUG("%s for cmd code 0x%02x", __func__, cmd_code);
if ((cmd_code > (SMP_OPCODE_MAX + 1 /* for SMP_OPCODE_PAIR_COMMITM */)) ||
(cmd_code < SMP_OPCODE_MIN))
{
SMP_TRACE_WARNING("Somehow received command with the RESERVED code 0x%02x", cmd_code);
return TRUE;
}
if (!(*smp_cmd_len_is_valid[cmd_code])(p_cb))
return TRUE;
if (!(*smp_cmd_param_ranges_are_valid[cmd_code])(p_cb))
return TRUE;
return FALSE;
}
/*******************************************************************************
**
** Function smp_command_has_valid_fixed_length
**
** Description Checks if the received command size is equal to the size
** according to specs.
**
** Returns TRUE if the command size is as expected, FALSE otherwise.
**
** Note The command is expected to have fixed length.
*******************************************************************************/
BOOLEAN smp_command_has_valid_fixed_length(tSMP_CB *p_cb)
{
UINT8 cmd_code = p_cb->rcvd_cmd_code;
SMP_TRACE_DEBUG("%s for cmd code 0x%02x", __func__, cmd_code);
if (p_cb->rcvd_cmd_len != smp_cmd_size_per_spec[cmd_code])
{
SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with invalid length\
0x%02x (per spec the length is 0x%02x).",
cmd_code, p_cb->rcvd_cmd_len, smp_cmd_size_per_spec[cmd_code]);
return FALSE;
}
return TRUE;
}
/*******************************************************************************
**
** Function smp_pairing_request_response_parameters_are_valid
**
** Description Validates parameter ranges in the received SMP command
** pairing request or pairing response.
** The parameters to validate:
** IO capability,
** OOB data flag,
** Bonding_flags in AuthReq
** Maximum encryption key size.
** Returns FALSE if at least one of these parameters is out of range.
**
*******************************************************************************/
BOOLEAN smp_pairing_request_response_parameters_are_valid(tSMP_CB *p_cb)
{
UINT8 io_caps = p_cb->peer_io_caps;
UINT8 oob_flag = p_cb->peer_oob_flag;
UINT8 bond_flag = p_cb->peer_auth_req & 0x03; //0x03 is gen bond with appropriate mask
UINT8 enc_size = p_cb->peer_enc_size;
SMP_TRACE_DEBUG("%s for cmd code 0x%02x", __func__, p_cb->rcvd_cmd_code);
if (io_caps >= BTM_IO_CAP_MAX)
{
SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with IO Capabilty \
value (0x%02x) out of range).",
p_cb->rcvd_cmd_code, io_caps);
return FALSE;
}
if (!((oob_flag == SMP_OOB_NONE) || (oob_flag == SMP_OOB_PRESENT)))
{
SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with OOB data flag value \
(0x%02x) out of range).",
p_cb->rcvd_cmd_code, oob_flag);
return FALSE;
}
if (!((bond_flag == SMP_AUTH_NO_BOND) || (bond_flag == SMP_AUTH_BOND)))
{
SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Bonding_Flags value (0x%02x)\
out of range).",
p_cb->rcvd_cmd_code, bond_flag);
return FALSE;
}
if ((enc_size < SMP_ENCR_KEY_SIZE_MIN) || (enc_size > SMP_ENCR_KEY_SIZE_MAX))
{
SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Maximum Encryption \
Key value (0x%02x) out of range).",
p_cb->rcvd_cmd_code, enc_size);
return FALSE;
}
return TRUE;
}
/*******************************************************************************
**
** Function smp_pairing_keypress_notification_is_valid
**
** Description Validates Notification Type parameter range in the received SMP command
** pairing keypress notification.
** Returns FALSE if this parameter is out of range.
**
*******************************************************************************/
BOOLEAN smp_pairing_keypress_notification_is_valid(tSMP_CB *p_cb)
{
tBTM_SP_KEY_TYPE keypress_notification = p_cb->peer_keypress_notification;
SMP_TRACE_DEBUG("%s for cmd code 0x%02x", __func__, p_cb->rcvd_cmd_code);
if (keypress_notification >= BTM_SP_KEY_OUT_OF_RANGE)
{
SMP_TRACE_WARNING("Rcvd from the peer cmd 0x%02x with Pairing Keypress \
Notification value (0x%02x) out of range).",
p_cb->rcvd_cmd_code, keypress_notification);
return FALSE;
}
return TRUE;
}
/*******************************************************************************
**
** Function smp_parameter_unconditionally_valid
**
** Description Always returns TRUE.
**
*******************************************************************************/
BOOLEAN smp_parameter_unconditionally_valid(tSMP_CB *p_cb)
{
return TRUE;
}
/*******************************************************************************
**
** Function smp_parameter_unconditionally_invalid
**
** Description Always returns FALSE.
**
*******************************************************************************/
BOOLEAN smp_parameter_unconditionally_invalid(tSMP_CB *p_cb)
{
return FALSE;
}
/*******************************************************************************
**
** Function smp_reject_unexpected_pairing_command
**
** Description send pairing failure to an unexpected pairing command during
** an active pairing process.
**
** Returns void
**
*******************************************************************************/
void smp_reject_unexpected_pairing_command(BD_ADDR bd_addr)
{
BT_HDR *p_buf;
UINT8 *p;
SMP_TRACE_DEBUG ("%s", __FUNCTION__);
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) +\
SMP_PAIR_FAIL_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, SMP_OPCODE_PAIRING_FAILED);
UINT8_TO_STREAM (p, SMP_PAIR_NOT_SUPPORT);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = SMP_PAIR_FAIL_SIZE;
smp_send_msg_to_L2CAP(bd_addr, p_buf);
}
}
/*******************************************************************************
** Function smp_select_association_model
**
** Description This function selects association model to use for STK
** generation. Selection is based on both sides' io capability,
** oob data flag and authentication request.
**
** Note If Secure Connections Only mode is required locally then we
** come to this point only if both sides support Secure Connections
** mode, i.e. if p_cb->secure_connections_only_mode_required = TRUE then we come
** to this point only if
** (p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) ==
** (p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT) ==
** SMP_SC_SUPPORT_BIT
**
*******************************************************************************/
tSMP_ASSO_MODEL smp_select_association_model(tSMP_CB *p_cb)
{
tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;
p_cb->le_secure_connections_mode_is_used = FALSE;
SMP_TRACE_EVENT("%s", __FUNCTION__);
SMP_TRACE_DEBUG("%s p_cb->peer_io_caps = %d p_cb->local_io_capability = %d",
__FUNCTION__, p_cb->peer_io_caps, p_cb->local_io_capability);
SMP_TRACE_DEBUG("%s p_cb->peer_oob_flag = %d p_cb->loc_oob_flag = %d",
__FUNCTION__, p_cb->peer_oob_flag, p_cb->loc_oob_flag);
SMP_TRACE_DEBUG("%s p_cb->peer_auth_req = 0x%02x p_cb->loc_auth_req = 0x%02x",
__FUNCTION__, p_cb->peer_auth_req, p_cb->loc_auth_req);
SMP_TRACE_DEBUG("%s p_cb->secure_connections_only_mode_required = %s",
__FUNCTION__, p_cb->secure_connections_only_mode_required ?
"TRUE" : "FALSE");
if ((p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) && (p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT))
{
p_cb->le_secure_connections_mode_is_used = TRUE;
}
SMP_TRACE_DEBUG("use_sc_process = %d", p_cb->le_secure_connections_mode_is_used);
if (p_cb->le_secure_connections_mode_is_used)
{
model = smp_select_association_model_secure_connections(p_cb);
}
else
{
model = smp_select_legacy_association_model(p_cb);
}
return model;
}
/*******************************************************************************
** Function smp_select_legacy_association_model
**
** Description This function is called to select association mode if at least
** one side doesn't support secure connections.
**
*******************************************************************************/
tSMP_ASSO_MODEL smp_select_legacy_association_model(tSMP_CB *p_cb)
{
tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;
SMP_TRACE_DEBUG("%s", __func__);
/* if OOB data is present on both devices, then use OOB association model */
if (p_cb->peer_oob_flag == SMP_OOB_PRESENT && p_cb->loc_oob_flag == SMP_OOB_PRESENT)
return SMP_MODEL_OOB;
/* else if neither device requires MITM, then use Just Works association model */
if (SMP_NO_MITM_REQUIRED (p_cb->peer_auth_req) && SMP_NO_MITM_REQUIRED(p_cb->loc_auth_req))
return SMP_MODEL_ENCRYPTION_ONLY;
/* otherwise use IO capability to select association model */
if (p_cb->peer_io_caps < SMP_IO_CAP_MAX && p_cb->local_io_capability < SMP_IO_CAP_MAX)
{
if (p_cb->role == HCI_ROLE_MASTER)
{
model = smp_association_table[p_cb->role][p_cb->peer_io_caps]
[p_cb->local_io_capability];
}
else
{
model = smp_association_table[p_cb->role][p_cb->local_io_capability]
[p_cb->peer_io_caps];
}
}
return model;
}
/*******************************************************************************
** Function smp_select_association_model_secure_connections
**
** Description This function is called to select association mode if both
** sides support secure connections.
**
*******************************************************************************/
tSMP_ASSO_MODEL smp_select_association_model_secure_connections(tSMP_CB *p_cb)
{
tSMP_ASSO_MODEL model = SMP_MODEL_OUT_OF_RANGE;
SMP_TRACE_DEBUG("%s", __func__);
/* if OOB data is present on at least one device, then use OOB association model */
if (p_cb->peer_oob_flag == SMP_OOB_PRESENT || p_cb->loc_oob_flag == SMP_OOB_PRESENT)
return SMP_MODEL_SEC_CONN_OOB;
/* else if neither device requires MITM, then use Just Works association model */
if (SMP_NO_MITM_REQUIRED (p_cb->peer_auth_req) && SMP_NO_MITM_REQUIRED(p_cb->loc_auth_req))
return SMP_MODEL_SEC_CONN_JUSTWORKS;
/* otherwise use IO capability to select association model */
if (p_cb->peer_io_caps < SMP_IO_CAP_MAX && p_cb->local_io_capability < SMP_IO_CAP_MAX)
{
if (p_cb->role == HCI_ROLE_MASTER)
{
model = smp_association_table_sc[p_cb->role][p_cb->peer_io_caps]
[p_cb->local_io_capability];
}
else
{
model = smp_association_table_sc[p_cb->role][p_cb->local_io_capability]
[p_cb->peer_io_caps];
}
}
return model;
}
/*******************************************************************************
** Function smp_reverse_array
**
** Description This function reverses array bytes
**
*******************************************************************************/
void smp_reverse_array(UINT8 *arr, UINT8 len)
{
UINT8 i =0, tmp;
SMP_TRACE_DEBUG("smp_reverse_array");
for (i = 0; i < len/2; i ++)
{
tmp = arr[i];
arr[i] = arr[len -1 - i];
arr[len -1 - i] = tmp;
}
}
/*******************************************************************************
** Function smp_calculate_random_input
**
** Description This function returns random input value to be used in commitment
** calculation for SC passkey entry association mode
** (if bit["round"] in "random" array == 1 then returns 0x81
** else returns 0x80).
**
** Returns ri value
**
*******************************************************************************/
UINT8 smp_calculate_random_input(UINT8 *random, UINT8 round)
{
UINT8 i = round/8;
UINT8 j = round%8;
UINT8 ri;
SMP_TRACE_DEBUG("random: 0x%02x, round: %d, i: %d, j: %d", random[i], round, i, j);
ri = ((random[i] >> j) & 1) | 0x80;
SMP_TRACE_DEBUG("%s ri=0x%02x", __func__, ri);
return ri;
}
/*******************************************************************************
** Function smp_collect_local_io_capabilities
**
** Description This function puts into IOcap array local device
** IOCapability, OOB data, AuthReq.
**
** Returns void
**
*******************************************************************************/
void smp_collect_local_io_capabilities(UINT8 *iocap, tSMP_CB *p_cb)
{
SMP_TRACE_DEBUG("%s", __func__);
iocap[0] = p_cb->local_io_capability;
iocap[1] = p_cb->loc_oob_flag;
iocap[2] = p_cb->loc_auth_req;
}
/*******************************************************************************
** Function smp_collect_peer_io_capabilities
**
** Description This function puts into IOcap array peer device
** IOCapability, OOB data, AuthReq.
**
** Returns void
**
*******************************************************************************/
void smp_collect_peer_io_capabilities(UINT8 *iocap, tSMP_CB *p_cb)
{
SMP_TRACE_DEBUG("%s", __func__);
iocap[0] = p_cb->peer_io_caps;
iocap[1] = p_cb->peer_oob_flag;
iocap[2] = p_cb->peer_auth_req;
}
/*******************************************************************************
** Function smp_collect_local_ble_address
**
** Description This function puts into le_addr array local device le address:
** le_addr[0-5] = local BD ADDR,
** le_addr[6] = local le address type (PUBLIC/RANDOM).
**
** Returns void
**
*******************************************************************************/
void smp_collect_local_ble_address(UINT8 *le_addr, tSMP_CB *p_cb)
{
tBLE_ADDR_TYPE addr_type = 0;
BD_ADDR bda;
UINT8 *p = le_addr;
SMP_TRACE_DEBUG("%s", __func__);
BTM_ReadConnectionAddr( p_cb->pairing_bda, bda, &addr_type);
BDADDR_TO_STREAM(p, bda);
UINT8_TO_STREAM(p, addr_type);
}
/*******************************************************************************
** Function smp_collect_peer_ble_address
**
** Description This function puts into le_addr array peer device le address:
** le_addr[0-5] = peer BD ADDR,
** le_addr[6] = peer le address type (PUBLIC/RANDOM).
**
** Returns void
**
*******************************************************************************/
void smp_collect_peer_ble_address(UINT8 *le_addr, tSMP_CB *p_cb)
{
tBLE_ADDR_TYPE addr_type = 0;
BD_ADDR bda;
UINT8 *p = le_addr;
SMP_TRACE_DEBUG("%s", __func__);
if (!BTM_ReadRemoteConnectionAddr(p_cb->pairing_bda, bda, &addr_type))
{
SMP_TRACE_ERROR("can not collect peer le addr information for unknown device");
return;
}
BDADDR_TO_STREAM(p, bda);
UINT8_TO_STREAM(p, addr_type);
}
/*******************************************************************************
** Function smp_check_commitment
**
** Description This function compares peer commitment values:
** - expected (i.e. calculated locally),
** - received from the peer.
**
** Returns TRUE if the values are the same
** FALSE otherwise
**
*******************************************************************************/
BOOLEAN smp_check_commitment(tSMP_CB *p_cb)
{
BT_OCTET16 expected;
SMP_TRACE_DEBUG("%s", __func__);
smp_calculate_peer_commitment(p_cb, expected);
print128(expected, (const UINT8 *)"calculated peer commitment");
print128(p_cb->remote_commitment, (const UINT8 *)"received peer commitment");
if (memcmp(p_cb->remote_commitment, expected, BT_OCTET16_LEN))
{
SMP_TRACE_WARNING("Commitment check fails");
return FALSE;
}
SMP_TRACE_DEBUG("Commitment check succeeds");
return TRUE;
}
/*******************************************************************************
**
** Function smp_save_secure_connections_long_term_key
**
** Description The function saves SC LTK as BLE key for future use as local
** and/or peer key.
**
** Returns void
**
*******************************************************************************/
void smp_save_secure_connections_long_term_key(tSMP_CB *p_cb)
{
tBTM_LE_LENC_KEYS lle_key;
tBTM_LE_PENC_KEYS ple_key;
SMP_TRACE_DEBUG("%s-Save LTK as local LTK key", __func__);
memcpy(lle_key.ltk, p_cb->ltk, BT_OCTET16_LEN);
lle_key.div = 0;
lle_key.key_size = p_cb->loc_enc_size;
lle_key.sec_level = p_cb->sec_level;
btm_sec_save_le_key(p_cb->pairing_bda, BTM_LE_KEY_LENC, (tBTM_LE_KEY_VALUE *)&lle_key, TRUE);
SMP_TRACE_DEBUG("%s-Save LTK as peer LTK key", __func__);
ple_key.ediv = 0;
memset(ple_key.rand, 0, BT_OCTET8_LEN);
memcpy(ple_key.ltk, p_cb->ltk, BT_OCTET16_LEN);
ple_key.sec_level = p_cb->sec_level;
ple_key.key_size = p_cb->loc_enc_size;
btm_sec_save_le_key(p_cb->pairing_bda, BTM_LE_KEY_PENC, (tBTM_LE_KEY_VALUE *)&ple_key, TRUE);
}
/*******************************************************************************
**
** Function smp_calculate_f5_mackey_and_long_term_key
**
** Description The function calculates MacKey and LTK and saves them in CB.
** To calculate MacKey and LTK it calls smp_calc_f5(...).
** MacKey is used in dhkey calculation, LTK is used to encrypt
** the link.
**
** Returns FALSE if out of resources, TRUE otherwise.
**
*******************************************************************************/
BOOLEAN smp_calculate_f5_mackey_and_long_term_key(tSMP_CB *p_cb)
{
UINT8 a[7];
UINT8 b[7];
UINT8 *p_na;
UINT8 *p_nb;
SMP_TRACE_DEBUG("%s", __func__);
if (p_cb->role == HCI_ROLE_MASTER)
{
smp_collect_local_ble_address(a, p_cb);
smp_collect_peer_ble_address(b, p_cb);
p_na = p_cb->rand;
p_nb = p_cb->rrand;
}
else
{
smp_collect_local_ble_address(b, p_cb);
smp_collect_peer_ble_address(a, p_cb);
p_na = p_cb->rrand;
p_nb = p_cb->rand;
}
if(!smp_calculate_f5(p_cb->dhkey, p_na, p_nb, a, b, p_cb->mac_key, p_cb->ltk))
{
SMP_TRACE_ERROR("%s failed", __func__);
return FALSE;
}
SMP_TRACE_EVENT ("%s is completed", __func__);
return TRUE;
}
/*******************************************************************************
**
** Function smp_request_oob_data
**
** Description Requests application to provide OOB data.
**
** Returns TRUE - OOB data has to be provided by application
** FALSE - otherwise (unexpected)
**
*******************************************************************************/
BOOLEAN smp_request_oob_data(tSMP_CB *p_cb)
{
tSMP_OOB_DATA_TYPE req_oob_type = SMP_OOB_INVALID_TYPE;
SMP_TRACE_DEBUG("%s", __func__);
if (p_cb->peer_oob_flag == SMP_OOB_PRESENT && p_cb->loc_oob_flag == SMP_OOB_PRESENT)
{
/* both local and peer rcvd data OOB */
req_oob_type = SMP_OOB_BOTH;
}
else if (p_cb->peer_oob_flag == SMP_OOB_PRESENT)
{
/* peer rcvd OOB local data, local didn't receive OOB peer data */
req_oob_type = SMP_OOB_LOCAL;
}
else if (p_cb->loc_oob_flag == SMP_OOB_PRESENT)
{
req_oob_type = SMP_OOB_PEER;
}
SMP_TRACE_DEBUG("req_oob_type = %d", req_oob_type);
if (req_oob_type == SMP_OOB_INVALID_TYPE)
return FALSE;
p_cb->req_oob_type = req_oob_type;
p_cb->cb_evt = SMP_SC_OOB_REQ_EVT;
smp_sm_event(p_cb, SMP_TK_REQ_EVT, &req_oob_type);
return TRUE;
}
#endif