e0d36beb72
The LE Audio related profiles define specific security requirements that client have to met to gain access to related characteristics. This introduces internal wrapper API for GATT characteristics and CCC descriptors to ensure the security. Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/* Common functions for LE Audio services */
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/*
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* Copyright (c) 2022 Codecoup
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/bluetooth/att.h>
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#include <zephyr/bluetooth/conn.h>
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#include <zephyr/bluetooth/hci.h>
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#include <zephyr/bluetooth/audio/audio.h>
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#include "audio_internal.h"
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static uint8_t bt_audio_security_check(const struct bt_conn *conn)
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{
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struct bt_conn_info info;
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int err;
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err = bt_conn_get_info(conn, &info);
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if (err < 0) {
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return BT_ATT_ERR_UNLIKELY;
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}
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/* Require an encryption key with at least 128 bits of entropy, derived from SC or OOB
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* method.
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*/
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if ((info.security.flags & (BT_SECURITY_FLAG_OOB | BT_SECURITY_FLAG_SC)) == 0) {
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/* If the client has insufficient security to read/write the requested attribute
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* then an ATT_ERROR_RSP PDU shall be sent with the Error Code parameter set to
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* Insufficient Authentication (0x05).
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*/
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return BT_ATT_ERR_AUTHENTICATION;
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}
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if (info.security.enc_key_size < BT_ENC_KEY_SIZE_MAX) {
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return BT_ATT_ERR_ENCRYPTION_KEY_SIZE;
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}
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return BT_ATT_ERR_SUCCESS;
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}
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ssize_t bt_audio_read_chrc(struct bt_conn *conn, const struct bt_gatt_attr *attr,
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void *buf, uint16_t len, uint16_t offset)
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{
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const struct bt_audio_attr_user_data *user_data = attr->user_data;
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if (user_data->read == NULL) {
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return BT_GATT_ERR(BT_ATT_ERR_READ_NOT_PERMITTED);
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}
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if (conn != NULL) {
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uint8_t err;
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err = bt_audio_security_check(conn);
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if (err != 0) {
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return BT_GATT_ERR(err);
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}
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}
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return user_data->read(conn, attr, buf, len, offset);
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}
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ssize_t bt_audio_write_chrc(struct bt_conn *conn, const struct bt_gatt_attr *attr,
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const void *buf, uint16_t len, uint16_t offset, uint8_t flags)
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{
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const struct bt_audio_attr_user_data *user_data = attr->user_data;
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if (user_data->write == NULL) {
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return BT_GATT_ERR(BT_ATT_ERR_WRITE_NOT_PERMITTED);
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}
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if (conn != NULL) {
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uint8_t err;
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err = bt_audio_security_check(conn);
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if (err != 0) {
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return BT_GATT_ERR(err);
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}
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}
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return user_data->write(conn, attr, buf, len, offset, flags);
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}
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ssize_t bt_audio_ccc_cfg_write(struct bt_conn *conn, const struct bt_gatt_attr *attr,
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uint16_t value)
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{
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if (conn != NULL) {
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uint8_t err;
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err = bt_audio_security_check(conn);
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if (err != 0) {
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return BT_GATT_ERR(err);
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}
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}
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return sizeof(value);
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}
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