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98 lines
3.5 KiB
C++
98 lines
3.5 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// The sandbox2::Notify class handless exceptional situations in the sandbox
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#ifndef SANDBOXED_API_SANDBOX2_NOTIFY_H_
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#define SANDBOXED_API_SANDBOX2_NOTIFY_H_
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#include <sys/types.h>
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#include "absl/base/attributes.h"
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#include "absl/log/log.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/result.h"
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#include "sandboxed_api/sandbox2/syscall.h"
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#include "sandboxed_api/sandbox2/util.h"
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namespace sandbox2 {
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enum ViolationType {
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// A syscall disallowed by the policy was invoked.
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kSyscallViolation,
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// A syscall with cpu architecture not covered by the policy was invoked.
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kArchitectureSwitchViolation,
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};
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class Notify {
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public:
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virtual ~Notify() = default;
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// Called when a process has been created and executed, but not yet sandboxed.
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// Using comms only makes sense if the client is sandboxed in the
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// Executor::set_enable_sandbox_before_exec(false) mode.
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// Returns a success indicator: false will cause the Sandbox Monitor to return
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// sandbox2::Result::SETUP_ERROR for Run()/RunAsync().
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virtual bool EventStarted(pid_t pid, Comms* comms) { return true; }
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// Called when all sandboxed processes finished.
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virtual void EventFinished(const Result& result) {}
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// Called when a process exited with a syscall violation.
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virtual void EventSyscallViolation(const Syscall& syscall,
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ViolationType type) {}
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// Called when a policy called TRACE. The syscall is allowed and logged if
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// this method returns true. This allows for implementing 'log, but allow'
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// policies.
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ABSL_DEPRECATED("Override EventSyscallTrace() instead")
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virtual bool EventSyscallTrap(const Syscall& syscall) { return false; }
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// Actions to perform after calling EventSyscallTrace.
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enum class TraceAction {
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// Deny the syscall.
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kDeny,
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// Allow the syscall.
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kAllow,
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// Allow the syscall so its return value can be inspected through a
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// subsequent call to EventSyscallReturn.
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// Requires Linux kernel 4.8 or later.
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kInspectAfterReturn
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};
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// Called when a policy called TRACE. The syscall is allowed or denied
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// depending on the return value of this function.
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virtual TraceAction EventSyscallTrace(const Syscall& syscall) {
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if (EventSyscallTrap(syscall)) {
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LOG(WARNING) << "[PERMITTED]: SYSCALL ::: PID: " << syscall.pid()
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<< ", PROG: '" << util::GetProgName(syscall.pid())
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<< "' : " << syscall.GetDescription();
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return TraceAction::kAllow;
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}
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return TraceAction::kDeny;
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}
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// Called when a policy called TRACE and EventSyscallTrace returned
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// kInspectAfterReturn.
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virtual void EventSyscallReturn(const Syscall& syscall,
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int64_t return_value) {}
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// Called when a process received a signal.
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virtual void EventSignal(pid_t pid, int sig_no) {}
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};
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} // namespace sandbox2
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#endif // SANDBOXED_API_SANDBOX2_NOTIFY_H_
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