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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/policy/linux/bpf_libassistant_policy_linux.h"
#include <netinet/tcp.h>
#include <sys/socket.h>
#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
#include "sandbox/linux/syscall_broker/broker_process.h"
#include "sandbox/linux/system_headers/linux_syscalls.h"
#include "sandbox/policy/linux/sandbox_linux.h"
using sandbox::bpf_dsl::Allow;
using sandbox::bpf_dsl::Arg;
using sandbox::bpf_dsl::Error;
using sandbox::bpf_dsl::If;
using sandbox::bpf_dsl::ResultExpr;
using sandbox::bpf_dsl::Trap;
using sandbox::syscall_broker::BrokerProcess;
namespace sandbox {
namespace policy {
LibassistantProcessPolicy::LibassistantProcessPolicy() = default;
LibassistantProcessPolicy::~LibassistantProcessPolicy() = default;
ResultExpr LibassistantProcessPolicy::EvaluateSyscall(int sysno) const {
switch (sysno) {
case __NR_socket: {
const Arg<int> domain(0);
const Arg<int> type(1);
const Arg<int> protocol(2);
const int kSockFlags = SOCK_CLOEXEC | SOCK_NONBLOCK;
return If(AllOf(domain == AF_UNIX, (type & ~kSockFlags) == SOCK_STREAM,
protocol == 0),
Allow())
.Else(Error(EPERM));
}
case __NR_getsockopt: {
const Arg<int> level(1);
const Arg<int> optname(2);
return If(AllOf(level == SOL_SOCKET, optname == SO_REUSEADDR), Allow())
.Else(BPFBasePolicy::EvaluateSyscall(sysno));
}
case __NR_setsockopt: {
const Arg<int> level(1);
const Arg<int> optname(2);
return If(AllOf(AnyOf(level == SOL_SOCKET, level == SOL_TCP),
AnyOf(optname == SO_REUSEADDR, optname == SO_MARK,
optname == SO_ZEROCOPY)),
Allow())
.Else(BPFBasePolicy::EvaluateSyscall(sysno));
}
case __NR_accept4:
case __NR_bind:
case __NR_connect:
// Needed by arm devices.
case __NR_getcpu:
case __NR_getpeername:
case __NR_getsockname:
case __NR_listen:
case __NR_sync:
return Allow();
default:
if (SyscallSets::IsGoogle3Threading(sysno)) {
return RestrictGoogle3Threading(sysno);
}
auto* sandbox_linux = SandboxLinux::GetInstance();
if (sandbox_linux->ShouldBrokerHandleSyscall(sysno))
return sandbox_linux->HandleViaBroker(sysno);
return BPFBasePolicy::EvaluateSyscall(sysno);
}
}
} // namespace policy
} // namespace sandbox
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