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/*
* Copyright (C) 2020 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 "adbconnection/client.h"
#include <pwd.h>
#include <stddef.h>
#include <stdint.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <memory>
#include <optional>
#include <android-base/cmsg.h>
#include <android-base/logging.h>
#include <android-base/unique_fd.h>
using android::base::unique_fd;
static constexpr char kJdwpControlName[] = "\0jdwp-control";
struct AdbConnectionClientContext {
unique_fd control_socket_;
};
bool SocketPeerIsTrusted(int fd) {
ucred cr;
socklen_t cr_length = sizeof(cr);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_length) != 0) {
PLOG(ERROR) << "couldn't get socket credentials";
return false;
}
passwd* shell = getpwnam("shell");
if (cr.uid != 0 && cr.uid != shell->pw_uid) {
LOG(ERROR) << "untrusted uid " << cr.uid << " on other end of socket";
return false;
}
return true;
}
AdbConnectionClientContext* adbconnection_client_new(
const AdbConnectionClientInfo* const* info_elems, size_t info_count) {
auto ctx = std::make_unique<AdbConnectionClientContext>();
std::optional<uint64_t> pid;
std::optional<bool> debuggable;
for (size_t i = 0; i < info_count; ++i) {
auto info = info_elems[i];
switch (info->type) {
case AdbConnectionClientInfoType::pid:
if (pid) {
LOG(ERROR) << "multiple pid entries in AdbConnectionClientInfo, ignoring";
continue;
}
pid = info->data.pid;
break;
case AdbConnectionClientInfoType::debuggable:
if (debuggable) {
LOG(ERROR) << "multiple debuggable entries in AdbConnectionClientInfo, ignoring";
continue;
}
debuggable = info->data.pid;
break;
}
}
if (!pid) {
LOG(ERROR) << "AdbConnectionClientInfo missing required field pid";
return nullptr;
}
if (!debuggable) {
LOG(ERROR) << "AdbConnectionClientInfo missing required field debuggable";
return nullptr;
}
ctx->control_socket_.reset(socket(AF_UNIX, SOCK_SEQPACKET | SOCK_CLOEXEC, 0));
if (ctx->control_socket_ < 0) {
PLOG(ERROR) << "failed to create Unix domain socket";
return nullptr;
}
struct timeval timeout;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
setsockopt(ctx->control_socket_.get(), SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
sockaddr_un addr = {};
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, kJdwpControlName, sizeof(kJdwpControlName));
size_t addr_len = offsetof(sockaddr_un, sun_path) + sizeof(kJdwpControlName) - 1;
int rc = connect(ctx->control_socket_.get(), reinterpret_cast<sockaddr*>(&addr), addr_len);
if (rc != 0) {
PLOG(ERROR) << "failed to connect to jdwp control socket";
return nullptr;
}
bool trusted = SocketPeerIsTrusted(ctx->control_socket_.get());
if (!trusted) {
LOG(ERROR) << "adb socket is not trusted, aborting connection";
return nullptr;
}
uint32_t pid_u32 = static_cast<uint32_t>(*pid);
rc = TEMP_FAILURE_RETRY(write(ctx->control_socket_.get(), &pid_u32, sizeof(pid_u32)));
if (rc != sizeof(pid_u32)) {
PLOG(ERROR) << "failed to send JDWP process pid to adbd";
}
return ctx.release();
}
void adbconnection_client_destroy(AdbConnectionClientContext* ctx) {
delete ctx;
}
int adbconnection_client_pollfd(AdbConnectionClientContext* ctx) {
return ctx->control_socket_.get();
}
int adbconnection_client_receive_jdwp_fd(AdbConnectionClientContext* ctx) {
char dummy;
unique_fd jdwp_fd;
ssize_t rc = android::base::ReceiveFileDescriptors(ctx->control_socket_, &dummy, 1, &jdwp_fd);
if (rc != 1) {
return rc;
}
return jdwp_fd.release();
}
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