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// Copyright 2019 Google LLC
//
// 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
//
// https://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.
// The sandbox2::Notify class handless exceptional situations in the sandbox
#ifndef SANDBOXED_API_SANDBOX2_NOTIFY_H_
#define SANDBOXED_API_SANDBOX2_NOTIFY_H_
#include <sys/types.h>
#include "absl/base/attributes.h"
#include "absl/log/log.h"
#include "sandboxed_api/sandbox2/comms.h"
#include "sandboxed_api/sandbox2/result.h"
#include "sandboxed_api/sandbox2/syscall.h"
#include "sandboxed_api/sandbox2/util.h"
namespace sandbox2 {
enum ViolationType {
// A syscall disallowed by the policy was invoked.
kSyscallViolation,
// A syscall with cpu architecture not covered by the policy was invoked.
kArchitectureSwitchViolation,
};
class Notify {
public:
virtual ~Notify() = default;
// Called when a process has been created and executed, but not yet sandboxed.
// Using comms only makes sense if the client is sandboxed in the
// Executor::set_enable_sandbox_before_exec(false) mode.
// Returns a success indicator: false will cause the Sandbox Monitor to return
// sandbox2::Result::SETUP_ERROR for Run()/RunAsync().
virtual bool EventStarted(pid_t pid, Comms* comms) { return true; }
// Called when all sandboxed processes finished.
virtual void EventFinished(const Result& result) {}
// Called when a process exited with a syscall violation.
virtual void EventSyscallViolation(const Syscall& syscall,
ViolationType type) {}
// Called when a policy called TRACE. The syscall is allowed and logged if
// this method returns true. This allows for implementing 'log, but allow'
// policies.
ABSL_DEPRECATED("Override EventSyscallTrace() instead")
virtual bool EventSyscallTrap(const Syscall& syscall) { return false; }
// Actions to perform after calling EventSyscallTrace.
enum class TraceAction {
// Deny the syscall.
kDeny,
// Allow the syscall.
kAllow,
// Allow the syscall so its return value can be inspected through a
// subsequent call to EventSyscallReturn.
// Requires Linux kernel 4.8 or later.
kInspectAfterReturn
};
// Called when a policy called TRACE. The syscall is allowed or denied
// depending on the return value of this function.
virtual TraceAction EventSyscallTrace(const Syscall& syscall) {
if (EventSyscallTrap(syscall)) {
LOG(WARNING) << "[PERMITTED]: SYSCALL ::: PID: " << syscall.pid()
<< ", PROG: '" << util::GetProgName(syscall.pid())
<< "' : " << syscall.GetDescription();
return TraceAction::kAllow;
}
return TraceAction::kDeny;
}
// Called when a policy called TRACE and EventSyscallTrace returned
// kInspectAfterReturn.
virtual void EventSyscallReturn(const Syscall& syscall,
int64_t return_value) {}
// Called when a process received a signal.
virtual void EventSignal(pid_t pid, int sig_no) {}
};
} // namespace sandbox2
#endif // SANDBOXED_API_SANDBOX2_NOTIFY_H_
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