47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
// +build linux
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package apparmor
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import (
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"io/ioutil"
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"os"
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"sync"
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)
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var (
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appArmorSupported bool
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checkAppArmor sync.Once
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)
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// hostSupports returns true if apparmor is enabled for the host, if
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// apparmor_parser is enabled, and if we are not running docker-in-docker.
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//
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// It is a modified version of libcontainer/apparmor.IsEnabled(), which does not
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// check for apparmor_parser to be present, or if we're running docker-in-docker.
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func hostSupports() bool {
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checkAppArmor.Do(func() {
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// see https://github.com/opencontainers/runc/blob/0d49470392206f40eaab3b2190a57fe7bb3df458/libcontainer/apparmor/apparmor_linux.go
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if _, err := os.Stat("/sys/kernel/security/apparmor"); err == nil && os.Getenv("container") == "" {
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buf, err := ioutil.ReadFile("/sys/module/apparmor/parameters/enabled")
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appArmorSupported = err == nil && len(buf) > 1 && buf[0] == 'Y'
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}
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})
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return appArmorSupported
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}
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