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prov.c
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prov.c
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/* Bluetooth Mesh */
/*
* Copyright (c) 2017 Intel Corporation
* Additional Copyright (c) 2018 Espressif Systems (Shanghai) PTE LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <string.h>
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BLE_MESH_DEBUG_PROV)
#include "crypto.h"
#include "adv.h"
#include "mesh.h"
#include "access.h"
#include "foundation.h"
#include "mesh_common.h"
#include "mesh_proxy.h"
#include "proxy_server.h"
#include "prov.h"
#if CONFIG_BLE_MESH_NODE
/* 3 transmissions, 20ms interval */
#define PROV_XMIT BLE_MESH_TRANSMIT(2, 20)
#define AUTH_METHOD_NO_OOB 0x00
#define AUTH_METHOD_STATIC 0x01
#define AUTH_METHOD_OUTPUT 0x02
#define AUTH_METHOD_INPUT 0x03
#define OUTPUT_OOB_BLINK 0x00
#define OUTPUT_OOB_BEEP 0x01
#define OUTPUT_OOB_VIBRATE 0x02
#define OUTPUT_OOB_NUMBER 0x03
#define OUTPUT_OOB_STRING 0x04
#define INPUT_OOB_PUSH 0x00
#define INPUT_OOB_TWIST 0x01
#define INPUT_OOB_NUMBER 0x02
#define INPUT_OOB_STRING 0x03
#define PUB_KEY_NO_OOB 0x00
#define PUB_KEY_OOB 0x01
#define PROV_ERR_NONE 0x00
#define PROV_ERR_NVAL_PDU 0x01
#define PROV_ERR_NVAL_FMT 0x02
#define PROV_ERR_UNEXP_PDU 0x03
#define PROV_ERR_CFM_FAILED 0x04
#define PROV_ERR_RESOURCES 0x05
#define PROV_ERR_DECRYPT 0x06
#define PROV_ERR_UNEXP_ERR 0x07
#define PROV_ERR_ADDR 0x08
#define PROV_INVITE 0x00
#define PROV_CAPABILITIES 0x01
#define PROV_START 0x02
#define PROV_PUB_KEY 0x03
#define PROV_INPUT_COMPLETE 0x04
#define PROV_CONFIRM 0x05
#define PROV_RANDOM 0x06
#define PROV_DATA 0x07
#define PROV_COMPLETE 0x08
#define PROV_FAILED 0x09
#define PROV_ALG_P256 0x00
#define GPCF(gpc) (gpc & 0x03)
#define GPC_START(last_seg) (((last_seg) << 2) | 0x00)
#define GPC_ACK 0x01
#define GPC_CONT(seg_id) (((seg_id) << 2) | 0x02)
#define GPC_CTL(op) (((op) << 2) | 0x03)
#define START_PAYLOAD_MAX 20
#define CONT_PAYLOAD_MAX 23
#define START_LAST_SEG(gpc) (gpc >> 2)
#define CONT_SEG_INDEX(gpc) (gpc >> 2)
#define BEARER_CTL(gpc) (gpc >> 2)
#define LINK_OPEN 0x00
#define LINK_ACK 0x01
#define LINK_CLOSE 0x02
#define CLOSE_REASON_SUCCESS 0x00
#define CLOSE_REASON_TIMEOUT 0x01
#define CLOSE_REASON_FAILED 0x02
#define XACT_SEG_DATA(_seg) (&link.rx.buf->data[20 + ((_seg - 1) * 23)])
#define XACT_SEG_RECV(_seg) (link.rx.seg &= ~(1 << (_seg)))
#define XACT_NVAL 0xff
enum {
REMOTE_PUB_KEY, /* Remote key has been received */
OOB_PUB_KEY, /* OOB public key is available */
LINK_ACTIVE, /* Link has been opened */
HAVE_DHKEY, /* DHKey has been calculated */
SEND_CONFIRM, /* Waiting to send Confirm value */
WAIT_NUMBER, /* Waiting for number input from user */
WAIT_STRING, /* Waiting for string input from user */
LINK_INVALID, /* Error occurred during provisioning */
NUM_FLAGS,
};
struct prov_link {
BLE_MESH_ATOMIC_DEFINE(flags, NUM_FLAGS);
#if defined(CONFIG_BLE_MESH_PB_GATT)
struct bt_mesh_conn *conn; /* GATT connection */
#endif
u8_t dhkey[32]; /* Calculated DHKey */
u8_t expect; /* Next expected PDU */
bool oob_pk_flag; /* Flag indicates whether using OOB public key */
u8_t oob_method;
u8_t oob_action;
u8_t oob_size;
u8_t conf[16]; /* Remote Confirmation */
u8_t rand[16]; /* Local Random */
u8_t auth[16]; /* Authentication Value */
u8_t conf_salt[16]; /* ConfirmationSalt */
u8_t conf_key[16]; /* ConfirmationKey */
u8_t conf_inputs[145]; /* ConfirmationInputs */
u8_t prov_salt[16]; /* Provisioning Salt */
#if defined(CONFIG_BLE_MESH_PB_ADV)
u32_t id; /* Link ID */
u8_t tx_pdu_type; /* The previously transmitted Provisioning PDU type */
struct {
u8_t id; /* Transaction ID */
u8_t prev_id; /* Previous Transaction ID */
u8_t seg; /* Bit-field of unreceived segments */
u8_t last_seg; /* Last segment (to check length) */
u8_t fcs; /* Expected FCS value */
struct net_buf_simple *buf;
} rx;
struct {
/* Start timestamp of the transaction */
s64_t start;
/* Transaction id*/
u8_t id;
/* Pending outgoing buffer(s) */
struct net_buf *buf[3];
/* Retransmit timer */
struct k_delayed_work retransmit;
} tx;
#endif
struct k_delayed_work prot_timer;
};
struct prov_rx {
u32_t link_id;
u8_t xact_id;
u8_t gpc;
};
#define BUF_TIMEOUT K_MSEC(400)
#if defined(CONFIG_BLE_MESH_FAST_PROV)
#define RETRANSMIT_TIMEOUT K_MSEC(360)
#define TRANSACTION_TIMEOUT K_SECONDS(3)
#define PROTOCOL_TIMEOUT K_SECONDS(6)
#else
#define RETRANSMIT_TIMEOUT K_MSEC(500)
#define TRANSACTION_TIMEOUT K_SECONDS(30)
#define PROTOCOL_TIMEOUT K_SECONDS(60)
#endif /* CONFIG_BLE_MESH_FAST_PROV */
#if defined(CONFIG_BLE_MESH_PB_GATT)
#define PROV_BUF_HEADROOM 5
#else
#define PROV_BUF_HEADROOM 0
NET_BUF_SIMPLE_DEFINE_STATIC(rx_buf, 65);
#endif
#define PROV_BUF(name, len) \
NET_BUF_SIMPLE_DEFINE(name, PROV_BUF_HEADROOM + len)
static struct prov_link link;
static const struct bt_mesh_prov *prov;
#if defined(CONFIG_BLE_MESH_PB_ADV)
static bt_mesh_mutex_t pb_buf_lock;
static inline void bt_mesh_pb_buf_mutex_new(void)
{
if (!pb_buf_lock.mutex) {
bt_mesh_mutex_create(&pb_buf_lock);
}
}
#if CONFIG_BLE_MESH_DEINIT
static inline void bt_mesh_pb_buf_mutex_free(void)
{
bt_mesh_mutex_free(&pb_buf_lock);
}
#endif /* CONFIG_BLE_MESH_DEINIT */
static inline void bt_mesh_pb_buf_lock(void)
{
bt_mesh_mutex_lock(&pb_buf_lock);
}
static inline void bt_mesh_pb_buf_unlock(void)
{
bt_mesh_mutex_unlock(&pb_buf_lock);
}
#endif /* CONFIG_BLE_MESH_PB_ADV */
static void reset_state(void)
{
k_delayed_work_cancel(&link.prot_timer);
/* Disable Attention Timer if it was set */
if (link.conf_inputs[0]) {
bt_mesh_attention(NULL, 0);
}
#if defined(CONFIG_BLE_MESH_PB_GATT)
if (link.conn) {
bt_mesh_conn_unref(link.conn);
}
#endif
#if defined(CONFIG_BLE_MESH_PB_ADV)
/* Clear everything except the retransmit and protocol timer
* delayed work objects.
*/
(void)memset(&link, 0, offsetof(struct prov_link, tx.retransmit));
link.rx.prev_id = XACT_NVAL;
#if defined(CONFIG_BLE_MESH_PB_GATT)
link.rx.buf = bt_mesh_proxy_server_get_buf();
#else
net_buf_simple_reset(&rx_buf);
link.rx.buf = &rx_buf;
#endif /* PB_GATT */
#else /* !PB_ADV */
/* Clear everything except the protocol timer (k_delayed_work) */
(void)memset(&link, 0, offsetof(struct prov_link, prot_timer));
#endif /* PB_ADV */
}
#if defined(CONFIG_BLE_MESH_PB_ADV)
static void buf_sent(int err, void *user_data)
{
if (!link.tx.buf[0]) {
return;
}
k_delayed_work_submit(&link.tx.retransmit, RETRANSMIT_TIMEOUT);
}
static struct bt_mesh_send_cb buf_sent_cb = {
.end = buf_sent,
};
static void free_segments(void)
{
int i;
bt_mesh_pb_buf_lock();
for (i = 0; i < ARRAY_SIZE(link.tx.buf); i++) {
struct net_buf *buf = link.tx.buf[i];
if (!buf) {
break;
}
link.tx.buf[i] = NULL;
bt_mesh_adv_buf_ref_debug(__func__, buf, 3U, BLE_MESH_BUF_REF_SMALL);
/* Mark as canceled */
BLE_MESH_ADV(buf)->busy = 0U;
net_buf_unref(buf);
}
bt_mesh_pb_buf_unlock();
}
static void prov_clear_tx(void)
{
BT_DBG("%s", __func__);
k_delayed_work_cancel(&link.tx.retransmit);
free_segments();
}
static void reset_adv_link(void)
{
prov_clear_tx();
if (prov->link_close) {
prov->link_close(BLE_MESH_PROV_ADV);
}
#if defined(CONFIG_BLE_MESH_USE_DUPLICATE_SCAN)
/* Remove the link id from exceptional list */
bt_mesh_update_exceptional_list(BLE_MESH_EXCEP_LIST_REMOVE,
BLE_MESH_EXCEP_INFO_MESH_LINK_ID, &link.id);
#endif
reset_state();
}
static struct net_buf *adv_buf_create(void)
{
struct net_buf *buf = NULL;
buf = bt_mesh_adv_create(BLE_MESH_ADV_PROV, PROV_XMIT, BUF_TIMEOUT);
if (!buf) {
BT_ERR("Out of provisioning buffers");
return NULL;
}
return buf;
}
static u8_t pending_ack = XACT_NVAL;
static void ack_complete(u16_t duration, int err, void *user_data)
{
BT_DBG("xact %u complete", (u8_t)pending_ack);
pending_ack = XACT_NVAL;
}
static void gen_prov_ack_send(u8_t xact_id)
{
static const struct bt_mesh_send_cb cb = {
.start = ack_complete,
};
const struct bt_mesh_send_cb *complete = NULL;
struct net_buf *buf = NULL;
BT_DBG("xact_id %u", xact_id);
if (pending_ack == xact_id) {
BT_DBG("Not sending duplicate ack");
return;
}
buf = adv_buf_create();
if (!buf) {
return;
}
if (pending_ack == XACT_NVAL) {
pending_ack = xact_id;
complete = &cb;
} else {
complete = NULL;
}
net_buf_add_be32(buf, link.id);
net_buf_add_u8(buf, xact_id);
net_buf_add_u8(buf, GPC_ACK);
bt_mesh_adv_send(buf, complete, NULL);
net_buf_unref(buf);
}
static void send_reliable(void)
{
int i;
link.tx.start = k_uptime_get();
for (i = 0; i < ARRAY_SIZE(link.tx.buf); i++) {
struct net_buf *buf = link.tx.buf[i];
if (!buf) {
break;
}
if (i + 1 < ARRAY_SIZE(link.tx.buf) && link.tx.buf[i + 1]) {
bt_mesh_adv_send(buf, NULL, NULL);
} else {
bt_mesh_adv_send(buf, &buf_sent_cb, NULL);
}
}
}
static int bearer_ctl_send(u8_t op, void *data, u8_t data_len)
{
struct net_buf *buf = NULL;
BT_DBG("op 0x%02x data_len %u", op, data_len);
prov_clear_tx();
buf = adv_buf_create();
if (!buf) {
return -ENOBUFS;
}
net_buf_add_be32(buf, link.id);
/* Transaction ID, always 0 for Bearer messages */
net_buf_add_u8(buf, 0x00);
net_buf_add_u8(buf, GPC_CTL(op));
net_buf_add_mem(buf, data, data_len);
link.tx.buf[0] = buf;
send_reliable();
return 0;
}
static u8_t last_seg(u8_t len)
{
if (len <= START_PAYLOAD_MAX) {
return 0;
}
len -= START_PAYLOAD_MAX;
return 1 + (len / CONT_PAYLOAD_MAX);
}
static inline u8_t next_transaction_id(void)
{
if (link.tx.id != 0U && link.tx.id != 0xFF) {
return ++link.tx.id;
}
link.tx.id = 0x80;
return link.tx.id;
}
static int prov_send_adv(struct net_buf_simple *msg)
{
struct net_buf *start = NULL, *buf = NULL;
u8_t seg_len = 0U, seg_id = 0U;
u8_t xact_id = 0U;
s32_t timeout = PROTOCOL_TIMEOUT;
BT_DBG("len %u: %s", msg->len, bt_hex(msg->data, msg->len));
prov_clear_tx();
start = adv_buf_create();
if (!start) {
return -ENOBUFS;
}
xact_id = next_transaction_id();
net_buf_add_be32(start, link.id);
net_buf_add_u8(start, xact_id);
net_buf_add_u8(start, GPC_START(last_seg(msg->len)));
net_buf_add_be16(start, msg->len);
net_buf_add_u8(start, bt_mesh_fcs_calc(msg->data, msg->len));
link.tx.buf[0] = start;
/* Changed by Espressif, get message type */
link.tx_pdu_type = msg->data[0];
seg_len = MIN(msg->len, START_PAYLOAD_MAX);
BT_DBG("seg 0 len %u: %s", seg_len, bt_hex(msg->data, seg_len));
net_buf_add_mem(start, msg->data, seg_len);
net_buf_simple_pull(msg, seg_len);
buf = start;
for (seg_id = 1U; msg->len > 0; seg_id++) {
if (seg_id >= ARRAY_SIZE(link.tx.buf)) {
BT_ERR("Too big message (seg_id %d)", seg_id);
free_segments();
return -E2BIG;
}
buf = adv_buf_create();
if (!buf) {
free_segments();
return -ENOBUFS;
}
link.tx.buf[seg_id] = buf;
seg_len = MIN(msg->len, CONT_PAYLOAD_MAX);
BT_DBG("seg_id %u len %u: %s", seg_id, seg_len,
bt_hex(msg->data, seg_len));
net_buf_add_be32(buf, link.id);
net_buf_add_u8(buf, xact_id);
net_buf_add_u8(buf, GPC_CONT(seg_id));
net_buf_add_mem(buf, msg->data, seg_len);
net_buf_simple_pull(msg, seg_len);
}
send_reliable();
/* Changed by Espressif, add provisioning timeout timer operations.
* When sending a provisioning PDU successfully, restart the 60s timer.
*/
#if defined(CONFIG_BLE_MESH_FAST_PROV)
if (link.tx_pdu_type >= PROV_COMPLETE) {
timeout = K_SECONDS(60);
}
#endif
k_delayed_work_submit(&link.prot_timer, timeout);
return 0;
}
#endif /* CONFIG_BLE_MESH_PB_ADV */
#if defined(CONFIG_BLE_MESH_PB_GATT)
static int prov_send_gatt(struct net_buf_simple *msg)
{
int err = 0;
if (!link.conn) {
return -ENOTCONN;
}
/* Changed by Espressif, add provisioning timeout timer operations.
* When sending a provisioning PDU successfully, restart the 60s timer.
*/
err = bt_mesh_proxy_server_send(link.conn, BLE_MESH_PROXY_PROV, msg);
if (err) {
BT_ERR("Failed to send provisioning PDU");
return err;
}
k_delayed_work_submit(&link.prot_timer, PROTOCOL_TIMEOUT);
return 0;
}
#endif /* CONFIG_BLE_MESH_PB_GATT */
static inline int prov_send(struct net_buf_simple *buf)
{
#if defined(CONFIG_BLE_MESH_PB_GATT)
if (link.conn) {
return prov_send_gatt(buf);
}
#endif
#if defined(CONFIG_BLE_MESH_PB_ADV)
return prov_send_adv(buf);
#else
return 0;
#endif
}
static void prov_buf_init(struct net_buf_simple *buf, u8_t type)
{
net_buf_simple_reserve(buf, PROV_BUF_HEADROOM);
net_buf_simple_add_u8(buf, type);
}
static void prov_send_fail_msg(u8_t err)
{
PROV_BUF(buf, 2);
prov_buf_init(&buf, PROV_FAILED);
net_buf_simple_add_u8(&buf, err);
if (prov_send(&buf)) {
BT_ERR("Failed to send Provisioning Failed message");
}
bt_mesh_atomic_set_bit(link.flags, LINK_INVALID);
}
static void prov_invite(const u8_t *data)
{
PROV_BUF(buf, 12);
BT_DBG("Attention Duration: %u seconds", data[0]);
if (data[0]) {
bt_mesh_attention(NULL, data[0]);
}
link.conf_inputs[0] = data[0];
prov_buf_init(&buf, PROV_CAPABILITIES);
/* Number of Elements supported */
net_buf_simple_add_u8(&buf, bt_mesh_elem_count());
/* Supported algorithms - FIPS P-256 Eliptic Curve */
net_buf_simple_add_be16(&buf, BIT(PROV_ALG_P256));
/* Public Key Type */
net_buf_simple_add_u8(&buf, prov->oob_pub_key);
/* Static OOB Type */
net_buf_simple_add_u8(&buf, prov->static_val ? BIT(0) : 0x00);
/* Output OOB Size */
net_buf_simple_add_u8(&buf, prov->output_size);
/* Output OOB Action */
net_buf_simple_add_be16(&buf, prov->output_actions);
/* Input OOB Size */
net_buf_simple_add_u8(&buf, prov->input_size);
/* Input OOB Action */
net_buf_simple_add_be16(&buf, prov->input_actions);
memcpy(&link.conf_inputs[1], &buf.data[1], 11);
if (prov_send(&buf)) {
BT_ERR("Failed to send capabilities");
return;
}
link.expect = PROV_START;
}
static void prov_capabilities(const u8_t *data)
{
u16_t algorithms = 0U, output_action = 0U, input_action = 0U;
BT_DBG("Elements: %u", data[0]);
algorithms = sys_get_be16(&data[1]);
BT_DBG("Algorithms: %u", algorithms);
BT_DBG("Public Key Type: 0x%02x", data[3]);
BT_DBG("Static OOB Type: 0x%02x", data[4]);
BT_DBG("Output OOB Size: %u", data[5]);
output_action = sys_get_be16(&data[6]);
BT_DBG("Output OOB Action: 0x%04x", output_action);
BT_DBG("Input OOB Size: %u", data[8]);
input_action = sys_get_be16(&data[9]);
BT_DBG("Input OOB Action: 0x%04x", input_action);
((void) algorithms);
((void) output_action);
((void) input_action);
}
static bt_mesh_output_action_t output_action(u8_t action)
{
switch (action) {
case OUTPUT_OOB_BLINK:
return BLE_MESH_BLINK;
case OUTPUT_OOB_BEEP:
return BLE_MESH_BEEP;
case OUTPUT_OOB_VIBRATE:
return BLE_MESH_VIBRATE;
case OUTPUT_OOB_NUMBER:
return BLE_MESH_DISPLAY_NUMBER;
case OUTPUT_OOB_STRING:
return BLE_MESH_DISPLAY_STRING;
default:
return BLE_MESH_NO_OUTPUT;
}
}
static bt_mesh_input_action_t input_action(u8_t action)
{
switch (action) {
case INPUT_OOB_PUSH:
return BLE_MESH_PUSH;
case INPUT_OOB_TWIST:
return BLE_MESH_TWIST;
case INPUT_OOB_NUMBER:
return BLE_MESH_ENTER_NUMBER;
case INPUT_OOB_STRING:
return BLE_MESH_ENTER_STRING;
default:
return BLE_MESH_NO_INPUT;
}
}
static int prov_auth(u8_t method, u8_t action, u8_t size)
{
bt_mesh_output_action_t output = 0U;
bt_mesh_input_action_t input = 0U;
switch (method) {
case AUTH_METHOD_NO_OOB:
if (action || size) {
return -EINVAL;
}
(void)memset(link.auth, 0, sizeof(link.auth));
return 0;
case AUTH_METHOD_STATIC:
if (action || size) {
return -EINVAL;
}
memcpy(link.auth + 16 - prov->static_val_len,
prov->static_val, prov->static_val_len);
(void)memset(link.auth, 0,
sizeof(link.auth) - prov->static_val_len);
return 0;
case AUTH_METHOD_OUTPUT:
output = output_action(action);
if (!output) {
return -EINVAL;
}
if (!(prov->output_actions & output)) {
return -EINVAL;
}
if (size > prov->output_size) {
return -EINVAL;
}
if (output == BLE_MESH_DISPLAY_STRING) {
unsigned char str[9] = {'\0'};
u8_t i = 0U;
bt_mesh_rand(str, size);
/* Normalize to '0' .. '9' & 'A' .. 'Z' */
for (i = 0U; i < size; i++) {
str[i] %= 36;
if (str[i] < 10) {
str[i] += '0';
} else {
str[i] += 'A' - 10;
}
}
str[size] = '\0';
memcpy(link.auth, str, size);
(void)memset(link.auth + size, 0,
sizeof(link.auth) - size);
return prov->output_string((char *)str);
} else {
u32_t div[8] = { 10, 100, 1000, 10000, 100000,
1000000, 10000000, 100000000
};
u32_t num = 0U;
bt_mesh_rand(&num, sizeof(num));
num %= div[size - 1];
sys_put_be32(num, &link.auth[12]);
(void)memset(link.auth, 0, 12);
return prov->output_number(output, num);
}
case AUTH_METHOD_INPUT:
input = input_action(action);
if (!input) {
return -EINVAL;
}
if (!(prov->input_actions & input)) {
return -EINVAL;
}
if (size > prov->input_size) {
return -EINVAL;
}
if (input == BLE_MESH_ENTER_STRING) {
bt_mesh_atomic_set_bit(link.flags, WAIT_STRING);
} else {
bt_mesh_atomic_set_bit(link.flags, WAIT_NUMBER);
}
return prov->input(input, size);
default:
return -EINVAL;
}
}
static void prov_start(const u8_t *data)
{
BT_INFO("Algorithm: 0x%02x", data[0]);
BT_INFO("Public Key: 0x%02x", data[1]);
BT_INFO("Auth Method: 0x%02x", data[2]);
BT_INFO("Auth Action: 0x%02x", data[3]);
BT_INFO("Auth Size: 0x%02x", data[4]);
if (data[0] != PROV_ALG_P256) {
BT_ERR("Unknown algorithm 0x%02x", data[0]);
prov_send_fail_msg(PROV_ERR_NVAL_FMT);
return;
}
if (data[1] != prov->oob_pub_key) {
BT_ERR("Invalid public key type: 0x%02x", data[1]);
prov_send_fail_msg(PROV_ERR_NVAL_FMT);
return;
}
memcpy(&link.conf_inputs[12], data, 5);
link.expect = PROV_PUB_KEY;
/* If Provisioning Start PDU indicates that provisioner chooses
* OOB public key, then callback to the application layer to let
* users input public & private key pair.
*/
link.oob_pk_flag = data[1] ? true : false;
if (link.oob_pk_flag) {
prov->oob_pub_key_cb();
}
if (prov_auth(data[2], data[3], data[4]) < 0) {
BT_ERR("Invalid authentication method: 0x%02x; "
"action: 0x%02x; size: 0x%02x",
data[2], data[3], data[4]);
prov_send_fail_msg(PROV_ERR_NVAL_FMT);
}
}
static void send_confirm(void)
{
PROV_BUF(cfm, 17);
BT_DBG("ConfInputs[0] %s", bt_hex(link.conf_inputs, 64));
BT_DBG("ConfInputs[64] %s", bt_hex(&link.conf_inputs[64], 64));
BT_DBG("ConfInputs[128] %s", bt_hex(&link.conf_inputs[128], 17));
if (bt_mesh_prov_conf_salt(link.conf_inputs, link.conf_salt)) {
BT_ERR("Unable to generate confirmation salt");
prov_send_fail_msg(PROV_ERR_UNEXP_ERR);
return;
}
BT_DBG("ConfirmationSalt: %s", bt_hex(link.conf_salt, 16));
if (bt_mesh_prov_conf_key(link.dhkey, link.conf_salt, link.conf_key)) {
BT_ERR("Unable to generate confirmation key");
prov_send_fail_msg(PROV_ERR_UNEXP_ERR);
return;
}
BT_DBG("ConfirmationKey: %s", bt_hex(link.conf_key, 16));
if (bt_mesh_rand(link.rand, 16)) {
BT_ERR("Unable to generate random number");
prov_send_fail_msg(PROV_ERR_UNEXP_ERR);
return;
}
BT_DBG("LocalRandom: %s", bt_hex(link.rand, 16));
prov_buf_init(&cfm, PROV_CONFIRM);
if (bt_mesh_prov_conf(link.conf_key, link.rand, link.auth,
net_buf_simple_add(&cfm, 16))) {
BT_ERR("Unable to generate confirmation value");
prov_send_fail_msg(PROV_ERR_UNEXP_ERR);
return;
}
if (prov_send(&cfm)) {
BT_ERR("Unable to send Provisioning Confirm");
return;
}
link.expect = PROV_RANDOM;
}
static void send_input_complete(void)
{
PROV_BUF(buf, 1);
prov_buf_init(&buf, PROV_INPUT_COMPLETE);
if (prov_send(&buf)) {
BT_ERR("Failed to send Provisioning Input Complete");
}
}
int bt_mesh_input_number(u32_t num)
{
BT_INFO("%u", num);
if (!bt_mesh_atomic_test_and_clear_bit(link.flags, WAIT_NUMBER)) {
return -EINVAL;
}
sys_put_be32(num, &link.auth[12]);
send_input_complete();
if (!bt_mesh_atomic_test_bit(link.flags, HAVE_DHKEY)) {
return 0;
}
if (bt_mesh_atomic_test_and_clear_bit(link.flags, SEND_CONFIRM)) {
send_confirm();
}
return 0;
}
int bt_mesh_input_string(const char *str)
{
BT_INFO("%s", str);
if (!bt_mesh_atomic_test_and_clear_bit(link.flags, WAIT_STRING)) {
return -EINVAL;
}
(void)memcpy(link.auth, str, prov->input_size);
send_input_complete();
if (!bt_mesh_atomic_test_bit(link.flags, HAVE_DHKEY)) {
return 0;
}
if (bt_mesh_atomic_test_and_clear_bit(link.flags, SEND_CONFIRM)) {
send_confirm();
}
return 0;
}
static void prov_dh_key_cb(const u8_t key[32], const u8_t idx)
{
BT_DBG("%p", key);
if (!key) {
BT_ERR("DHKey generation failed");
prov_send_fail_msg(PROV_ERR_UNEXP_ERR);
return;
}
sys_memcpy_swap(link.dhkey, key, 32);
BT_DBG("DHkey: %s", bt_hex(link.dhkey, 32));
bt_mesh_atomic_set_bit(link.flags, HAVE_DHKEY);
if (bt_mesh_atomic_test_bit(link.flags, WAIT_NUMBER) ||
bt_mesh_atomic_test_bit(link.flags, WAIT_STRING)) {
return;
}
if (bt_mesh_atomic_test_and_clear_bit(link.flags, SEND_CONFIRM)) {
send_confirm();
}
}
static void send_pub_key(void)
{
PROV_BUF(buf, 65);
const u8_t *key = NULL;
/* Copy remote key in little-endian for bt_mesh_dh_key_gen().
* X and Y halves are swapped independently. Use response
* buffer as a temporary storage location. The validating of
* the remote public key is finished when it is received.
*/
sys_memcpy_swap(buf.data, &link.conf_inputs[17], 32);
sys_memcpy_swap(&buf.data[32], &link.conf_inputs[49], 32);
if (bt_mesh_dh_key_gen(buf.data, prov_dh_key_cb, 0)) {
BT_ERR("Unable to generate DHKey");
prov_send_fail_msg(PROV_ERR_UNEXP_ERR);
return;
}
key = bt_mesh_pub_key_get();
if (!key) {
BT_ERR("No public key available");
prov_send_fail_msg(PROV_ERR_UNEXP_ERR);
return;
}
BT_DBG("Local Public Key: %s", bt_hex(key, 64));
prov_buf_init(&buf, PROV_PUB_KEY);
/* Swap X and Y halves independently to big-endian */
sys_memcpy_swap(net_buf_simple_add(&buf, 32), key, 32);
sys_memcpy_swap(net_buf_simple_add(&buf, 32), &key[32], 32);
memcpy(&link.conf_inputs[81], &buf.data[1], 64);
if (prov_send(&buf)) {
BT_ERR("Failed to send Public Key");