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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 <unistd.h>
#include "sandbox/linux/syscall_broker/broker_command.h"
#include "sandbox/linux/syscall_broker/broker_permission_list.h"
namespace sandbox {
namespace syscall_broker {
const char* CommandAccessIsSafe(const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename,
int requested_mode) {
if (!command_set.test(COMMAND_ACCESS)) {
return nullptr;
}
return policy.GetFileNameIfAllowedToAccess(requested_filename,
requested_mode);
}
const char* CommandMkdirIsSafe(const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename) {
if (!command_set.test(COMMAND_MKDIR)) {
return nullptr;
}
return policy
.GetFileNameIfAllowedToOpen(requested_filename, O_RDWR | O_CREAT | O_EXCL)
.first;
}
std::pair<const char*, bool> CommandOpenIsSafe(
const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename,
int requested_flags) {
if (!command_set.test(COMMAND_OPEN)) {
return {nullptr, false};
}
return policy.GetFileNameIfAllowedToOpen(
requested_filename, requested_flags & ~kCurrentProcessOpenFlagsMask);
}
const char* CommandReadlinkIsSafe(const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename) {
if (!command_set.test(COMMAND_READLINK)) {
return nullptr;
}
return policy.GetFileNameIfAllowedToOpen(requested_filename, O_RDONLY).first;
}
std::pair<const char*, const char*> CommandRenameIsSafe(
const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* old_filename,
const char* new_filename) {
if (!command_set.test(COMMAND_RENAME)) {
return {nullptr, nullptr};
}
auto old_allowed = policy.GetFileNameIfAllowedToOpen(
old_filename, O_RDWR | O_CREAT | O_EXCL);
auto new_allowed = policy.GetFileNameIfAllowedToOpen(
new_filename, O_RDWR | O_CREAT | O_EXCL);
if (!old_allowed.first || !new_allowed.first) {
return {nullptr, nullptr};
}
return {old_allowed.first, new_allowed.first};
}
const char* CommandRmdirIsSafe(const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename) {
if (!command_set.test(COMMAND_RMDIR)) {
return nullptr;
}
return policy
.GetFileNameIfAllowedToOpen(requested_filename, O_RDWR | O_CREAT | O_EXCL)
.first;
}
const char* CommandStatIsSafe(const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename) {
if (!command_set.test(COMMAND_STAT)) {
return nullptr;
}
return policy.GetFileNameIfAllowedToStat(requested_filename);
}
const char* CommandUnlinkIsSafe(const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename) {
if (!command_set.test(COMMAND_UNLINK)) {
return nullptr;
}
return policy
.GetFileNameIfAllowedToOpen(requested_filename, O_RDWR | O_CREAT | O_EXCL)
.first;
}
const char* CommandInotifyAddWatchIsSafe(const BrokerCommandSet& command_set,
const BrokerPermissionList& policy,
const char* requested_filename,
uint32_t mask) {
if (!command_set.test(COMMAND_INOTIFY_ADD_WATCH)) {
return nullptr;
}
return policy.GetFileNameIfAllowedToInotifyAddWatch(requested_filename, mask);
}
} // namespace syscall_broker
} // namespace sandbox
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