1 /******************************************************************************
2 *
3 * Copyright 2009-2013 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 #define LOG_TAG "bt_btif_gatt"
20
21 #include "btif_gatt_util.h"
22
23 #include <bluetooth/log.h>
24 #include <hardware/bluetooth.h>
25 #include <hardware/bt_gatt.h>
26 #include <stdlib.h>
27 #include <string.h>
28
29 #include <algorithm>
30
31 #include "bta/include/bta_api_data_types.h"
32 #include "bta/include/bta_sec_api.h"
33 #include "btif_storage.h"
34 #include "os/system_properties.h"
35 #include "stack/btm/btm_sec.h"
36 #include "stack/include/acl_api.h"
37 #include "types/ble_address_with_type.h"
38 #include "types/bluetooth/uuid.h"
39 #include "types/bt_transport.h"
40 #include "types/raw_address.h"
41
42 using bluetooth::Uuid;
43 using namespace bluetooth;
44
45 /*******************************************************************************
46 * BTIF -> BTA conversion functions
47 ******************************************************************************/
btif_to_bta_response(tGATTS_RSP * p_dest,btgatt_response_t * p_src)48 void btif_to_bta_response(tGATTS_RSP* p_dest, btgatt_response_t* p_src) {
49 p_dest->attr_value.auth_req = p_src->attr_value.auth_req;
50 p_dest->attr_value.handle = p_src->attr_value.handle;
51 p_dest->attr_value.len = std::min<uint16_t>(p_src->attr_value.len, GATT_MAX_ATTR_LEN);
52 p_dest->attr_value.offset = p_src->attr_value.offset;
53 memcpy(p_dest->attr_value.value, p_src->attr_value.value, p_dest->attr_value.len);
54 }
55
56 /*******************************************************************************
57 * Encrypted link map handling
58 ******************************************************************************/
59
btif_gatt_is_link_encrypted(const RawAddress & bd_addr)60 static bool btif_gatt_is_link_encrypted(const RawAddress& bd_addr) {
61 return BTM_IsEncrypted(bd_addr, BT_TRANSPORT_BR_EDR) || BTM_IsEncrypted(bd_addr, BT_TRANSPORT_LE);
62 }
63
btif_gatt_set_encryption_cb(const RawAddress &,tBT_TRANSPORT,tBTA_STATUS result)64 static void btif_gatt_set_encryption_cb(const RawAddress& /* bd_addr */,
65 tBT_TRANSPORT /* transport */, tBTA_STATUS result) {
66 if (result != BTA_SUCCESS && result != BTA_BUSY) {
67 log::warn("Encryption failed ({})", result);
68 }
69 }
70
btif_gatt_check_encrypted_link(RawAddress bd_addr,tBT_TRANSPORT transport_link)71 void btif_gatt_check_encrypted_link(RawAddress bd_addr, tBT_TRANSPORT transport_link) {
72 RawAddress raw_local_addr;
73 tBLE_ADDR_TYPE local_addr_type;
74 BTM_ReadConnectionAddr(bd_addr, raw_local_addr, &local_addr_type);
75 tBLE_BD_ADDR local_addr{local_addr_type, raw_local_addr};
76 if (!local_addr.IsPublic() && !local_addr.IsAddressResolvable()) {
77 log::debug("Not establishing encryption since address type is NRPA");
78 return;
79 }
80
81 static const bool check_encrypted =
82 bluetooth::os::GetSystemPropertyBool("bluetooth.gatt.check_encrypted_link.enabled", true);
83 if (!check_encrypted) {
84 log::debug("Check skipped due to system config");
85 return;
86 }
87 tBTM_LE_PENC_KEYS key;
88 if ((btif_storage_get_ble_bonding_key(bd_addr, BTM_LE_KEY_PENC, (uint8_t*)&key,
89 sizeof(tBTM_LE_PENC_KEYS)) == BT_STATUS_SUCCESS) &&
90 !btif_gatt_is_link_encrypted(bd_addr)) {
91 log::debug("Checking gatt link peer:{} transport:{}", bd_addr,
92 bt_transport_text(transport_link));
93 BTA_DmSetEncryption(bd_addr, transport_link, &btif_gatt_set_encryption_cb, BTM_BLE_SEC_ENCRYPT);
94 }
95 }
96