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filter.go
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filter.go
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// Copyright 2018 Google Inc.
//
// 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
//
// http://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.
// Package filter defines all syscalls the sandbox is allowed to make
// to the host, and installs seccomp filters to prevent prohibited
// syscalls in case it's compromised.
package filter
import (
"fmt"
"gvisor.googlesource.com/gvisor/pkg/log"
"gvisor.googlesource.com/gvisor/pkg/seccomp"
"gvisor.googlesource.com/gvisor/pkg/sentry/platform"
"gvisor.googlesource.com/gvisor/pkg/sentry/platform/kvm"
"gvisor.googlesource.com/gvisor/pkg/sentry/platform/ptrace"
)
// Install installs seccomp filters for based on the given platform.
func Install(p platform.Platform, whitelistFS, console, hostNetwork bool) error {
s := allowedSyscalls
// Set of additional filters used by -race and -msan. Returns empty
// when not enabled.
s = append(s, instrumentationFilters()...)
if whitelistFS {
Report("direct file access allows unrestricted file access!")
s = append(s, whitelistFSFilters()...)
}
if console {
Report("console is enabled: syscall filters less restrictive!")
s = append(s, consoleFilters()...)
}
if hostNetwork {
Report("host networking enabled: syscall filters less restrictive!")
s = append(s, hostInetFilters()...)
}
switch p := p.(type) {
case *ptrace.PTrace:
s = append(s, ptraceFilters()...)
case *kvm.KVM:
s = append(s, kvmFilters()...)
default:
return fmt.Errorf("unknown platform type %T", p)
}
// TODO: Set kill=true when SECCOMP_RET_KILL_PROCESS is supported.
return seccomp.Install(s, false)
}
// Report writes a warning message to the log.
func Report(msg string) {
log.Warningf("*** SECCOMP WARNING: %s", msg)
}