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// Copyright 2017 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_broker_policy_linux.h"
#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
#include "sandbox/linux/syscall_broker/broker_command.h"
#include "sandbox/linux/system_headers/linux_syscalls.h"
using sandbox::bpf_dsl::Allow;
using sandbox::bpf_dsl::ResultExpr;
namespace sandbox {
namespace policy {
BrokerProcessPolicy::BrokerProcessPolicy(
const syscall_broker::BrokerCommandSet& allowed_command_set)
: allowed_command_set_(allowed_command_set) {}
BrokerProcessPolicy::~BrokerProcessPolicy() {}
ResultExpr BrokerProcessPolicy::EvaluateSyscall(int sysno) const {
switch (sysno) {
#if defined(__NR_access)
case __NR_access:
if (allowed_command_set_.test(syscall_broker::COMMAND_ACCESS))
return Allow();
break;
#endif
#if defined(__NR_faccessat)
case __NR_faccessat:
#endif
#if defined(__NR_faccessat2)
case __NR_faccessat2:
#endif
#if defined(__NR_faccessat) || defined(__NR_faccessat2)
if (allowed_command_set_.test(syscall_broker::COMMAND_ACCESS))
return Allow();
break;
#endif
#if defined(__NR_mkdir)
case __NR_mkdir:
if (allowed_command_set_.test(syscall_broker::COMMAND_MKDIR))
return Allow();
break;
#endif
#if defined(__NR_mkdirat)
case __NR_mkdirat:
if (allowed_command_set_.test(syscall_broker::COMMAND_MKDIR))
return Allow();
break;
#endif
#if defined(__NR_open)
case __NR_open:
if (allowed_command_set_.test(syscall_broker::COMMAND_OPEN))
return Allow();
break;
#endif
#if defined(__NR_openat)
case __NR_openat:
if (allowed_command_set_.test(syscall_broker::COMMAND_OPEN))
return Allow();
break;
#endif
#if defined(__NR_rename)
case __NR_rename:
if (allowed_command_set_.test(syscall_broker::COMMAND_RENAME))
return Allow();
break;
#endif
#if defined(__NR_renameat)
case __NR_renameat:
if (allowed_command_set_.test(syscall_broker::COMMAND_RENAME))
return Allow();
break;
#endif
#if defined(__NR_stat)
case __NR_stat:
if (allowed_command_set_.test(syscall_broker::COMMAND_STAT))
return Allow();
break;
#endif
#if defined(__NR_stat64)
case __NR_stat64:
if (allowed_command_set_.test(syscall_broker::COMMAND_STAT))
return Allow();
break;
#endif
#if defined(__NR_lstat)
case __NR_lstat:
if (allowed_command_set_.test(syscall_broker::COMMAND_STAT))
return Allow();
break;
#endif
#if defined(__NR_lstat64)
case __NR_lstat64:
if (allowed_command_set_.test(syscall_broker::COMMAND_STAT))
return Allow();
break;
#endif
#if defined(__NR_fstatat64)
case __NR_fstatat64:
if (allowed_command_set_.test(syscall_broker::COMMAND_STAT))
return Allow();
break;
#endif
#if defined(__NR_newfstatat)
case __NR_newfstatat:
if (allowed_command_set_.test(syscall_broker::COMMAND_STAT))
return Allow();
break;
#endif
#if defined(__NR_readlink)
case __NR_readlink:
if (allowed_command_set_.test(syscall_broker::COMMAND_READLINK))
return Allow();
break;
#endif
#if defined(__NR_readlinkat)
case __NR_readlinkat:
if (allowed_command_set_.test(syscall_broker::COMMAND_READLINK))
return Allow();
break;
#endif
#if defined(__NR_rmdir)
case __NR_rmdir:
if (allowed_command_set_.test(syscall_broker::COMMAND_RMDIR))
return Allow();
break;
#endif
#if defined(__NR_unlink)
case __NR_unlink:
// NOTE: Open() uses unlink() to make "temporary" files.
if (allowed_command_set_.test(syscall_broker::COMMAND_OPEN) ||
allowed_command_set_.test(syscall_broker::COMMAND_UNLINK)) {
return Allow();
}
break;
#endif
#if defined(__NR_unlinkat)
case __NR_unlinkat:
// NOTE: Open() uses unlink() to make "temporary" files.
if (allowed_command_set_.test(syscall_broker::COMMAND_OPEN) ||
allowed_command_set_.test(syscall_broker::COMMAND_UNLINK)) {
return Allow();
}
break;
#endif
#if defined(__NR_inotify_add_watch)
case __NR_inotify_add_watch:
if (allowed_command_set_.test(
syscall_broker::COMMAND_INOTIFY_ADD_WATCH)) {
return Allow();
}
break;
#endif
default:
break;
}
return BPFBasePolicy::EvaluateSyscall(sysno);
}
} // namespace policy
} // namespace sandbox
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