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adb_wifi.cpp
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adb_wifi.cpp
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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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.
*/
#include "adb_wifi.h"
#include <fstream>
#include <random>
#include <thread>
#include <adb/crypto/key.h>
#include <adb/crypto/x509_generator.h>
#include <android-base/file.h>
#include <android-base/parsenetaddress.h>
#include "client/pairing/pairing_client.h"
#include "adb_auth.h"
#include "adb_known_hosts.pb.h"
#include "adb_utils.h"
#include "client/adb_client.h"
#include "sysdeps.h"
using adbwifi::pairing::PairingClient;
using namespace adb::crypto;
struct PairingResultWaiter {
std::mutex mutex_;
std::condition_variable cv_;
std::optional<bool> is_valid_;
PeerInfo peer_info_;
static void OnResult(const PeerInfo* peer_info, void* opaque) {
CHECK(opaque);
auto* p = reinterpret_cast<PairingResultWaiter*>(opaque);
{
std::lock_guard<std::mutex> lock(p->mutex_);
if (peer_info) {
memcpy(&(p->peer_info_), peer_info, sizeof(PeerInfo));
}
p->is_valid_ = (peer_info != nullptr);
}
p->cv_.notify_one();
}
}; // PairingResultWaiter
void adb_wifi_init() {}
static std::vector<uint8_t> stringToUint8(const std::string& str) {
auto* p8 = reinterpret_cast<const uint8_t*>(str.data());
return std::vector<uint8_t>(p8, p8 + str.length());
}
// Tries to replace the |old_file| with |new_file|.
// On success, then |old_file| has been removed and replaced with the
// contents of |new_file|, |new_file| will be removed, and only |old_file| will
// remain.
// On failure, both files will be unchanged.
// |new_file| must exist, but |old_file| does not need to exist.
bool SafeReplaceFile(std::string_view old_file, std::string_view new_file) {
std::string to_be_deleted(old_file);
to_be_deleted += ".tbd";
bool old_renamed = true;
if (adb_rename(old_file.data(), to_be_deleted.c_str()) != 0) {
// Don't exit here. This is not necessarily an error, because |old_file|
// may not exist.
PLOG(INFO) << "Failed to rename " << old_file;
old_renamed = false;
}
if (adb_rename(new_file.data(), old_file.data()) != 0) {
PLOG(ERROR) << "Unable to rename file (" << new_file << " => " << old_file << ")";
if (old_renamed) {
// Rename the .tbd file back to it's original name
adb_rename(to_be_deleted.c_str(), old_file.data());
}
return false;
}
adb_unlink(to_be_deleted.c_str());
return true;
}
static std::string get_user_known_hosts_path() {
return adb_get_android_dir_path() + OS_PATH_SEPARATOR + "adb_known_hosts.pb";
}
bool load_known_hosts_from_file(const std::string& path, adb::proto::AdbKnownHosts& known_hosts) {
// Check for file existence.
struct stat buf;
if (stat(path.c_str(), &buf) == -1) {
LOG(INFO) << "Known hosts file [" << path << "] does not exist...";
return false;
}
std::ifstream file(path, std::ios::binary);
if (!file) {
PLOG(ERROR) << "Unable to open [" << path << "].";
return false;
}
if (!known_hosts.ParseFromIstream(&file)) {
PLOG(ERROR) << "Failed to parse [" << path << "]. Deleting it as it may be corrupted.";
adb_unlink(path.c_str());
return false;
}
return true;
}
static bool write_known_host_to_file(std::string& known_host) {
std::string path = get_user_known_hosts_path();
if (path.empty()) {
PLOG(ERROR) << "Error getting user known hosts filename";
return false;
}
adb::proto::AdbKnownHosts known_hosts;
load_known_hosts_from_file(path, known_hosts);
auto* host_info = known_hosts.add_host_infos();
host_info->set_guid(known_host);
std::unique_ptr<TemporaryFile> temp_file(new TemporaryFile(adb_get_android_dir_path()));
if (temp_file->fd == -1) {
PLOG(ERROR) << "Failed to open [" << temp_file->path << "] for writing";
return false;
}
if (!known_hosts.SerializeToFileDescriptor(temp_file->fd)) {
LOG(ERROR) << "Unable to write out adb_knowns_hosts";
return false;
}
temp_file->DoNotRemove();
std::string temp_file_name(temp_file->path);
temp_file.reset();
// Replace the existing adb_known_hosts with the new one
if (!SafeReplaceFile(path, temp_file_name.c_str())) {
LOG(ERROR) << "Failed to replace old adb_known_hosts";
adb_unlink(temp_file_name.c_str());
return false;
}
chmod(path.c_str(), S_IRUSR | S_IWUSR | S_IRGRP);
return true;
}
bool adb_wifi_is_known_host(const std::string& host) {
std::string path = get_user_known_hosts_path();
if (path.empty()) {
PLOG(ERROR) << "Error getting user known hosts filename";
return false;
}
adb::proto::AdbKnownHosts known_hosts;
if (!load_known_hosts_from_file(path, known_hosts)) {
return false;
}
for (const auto& host_info : known_hosts.host_infos()) {
if (host == host_info.guid()) {
return true;
}
}
return false;
}
void adb_wifi_pair_device(const std::string& host, const std::string& password,
std::string& response) {
// Check the address for a valid address and port.
std::string parsed_host;
std::string err;
int port = -1;
if (!android::base::ParseNetAddress(host, &parsed_host, &port, nullptr, &err)) {
response = "Failed to parse address for pairing: " + err;
return;
}
if (port <= 0 || port > 65535) {
response = "Invalid port while parsing address [" + host + "]";
return;
}
auto priv_key = adb_auth_get_user_privkey();
auto x509_cert = GenerateX509Certificate(priv_key.get());
if (!x509_cert) {
LOG(ERROR) << "Unable to create X509 certificate for pairing";
return;
}
auto cert_str = X509ToPEMString(x509_cert.get());
auto priv_str = Key::ToPEMString(priv_key.get());
// Send our public key on pairing success
PeerInfo system_info = {};
system_info.type = ADB_RSA_PUB_KEY;
std::string public_key = adb_auth_get_userkey();
CHECK_LE(public_key.size(), sizeof(system_info.data) - 1); // -1 for null byte
memcpy(system_info.data, public_key.data(), public_key.size());
auto pswd8 = stringToUint8(password);
auto cert8 = stringToUint8(cert_str);
auto priv8 = stringToUint8(priv_str);
auto client = PairingClient::Create(pswd8, system_info, cert8, priv8);
if (client == nullptr) {
response = "Failed: unable to create pairing client.";
return;
}
PairingResultWaiter waiter;
std::unique_lock<std::mutex> lock(waiter.mutex_);
if (!client->Start(host, waiter.OnResult, &waiter)) {
response = "Failed: Unable to start pairing client.";
return;
}
waiter.cv_.wait(lock, [&]() { return waiter.is_valid_.has_value(); });
if (!*(waiter.is_valid_)) {
response = "Failed: Wrong password or connection was dropped.";
return;
}
if (waiter.peer_info_.type != ADB_DEVICE_GUID) {
response = "Failed: Successfully paired but server returned unknown response=";
response += waiter.peer_info_.type;
return;
}
std::string device_guid = reinterpret_cast<const char*>(waiter.peer_info_.data);
response = "Successfully paired to " + host + " [guid=" + device_guid + "]";
// Write to adb_known_hosts
write_known_host_to_file(device_guid);
// Try to auto-connect.
adb_secure_connect_by_service_name(device_guid.c_str());
}