eba94a15c8
recent versions of libcontainer/apparmor simplified the AppArmor
check to only check if the host supports AppArmor, but no longer
checks if apparmor_parser is installed, or if we're running
docker-in-docker;
bfb4ea1b1b
> The `apparmor_parser` binary is not really required for a system to run
> AppArmor from a runc perspective. How to apply the profile is more in
> the responsibility of higher level runtimes like Podman and Docker,
> which may do the binary check on their own.
This patch copies the logic from libcontainer/apparmor, and
restores the additional checks.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
49 lines
1.5 KiB
Go
49 lines
1.5 KiB
Go
// +build apparmor,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 server
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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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// hostSupportsAppArmor 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 hostSupportsAppArmor() bool {
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checkAppArmor.Do(func() {
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// see https://github.com/docker/docker/commit/de191e86321f7d3136ff42ff75826b8107399497
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if _, err := os.Stat("/sys/kernel/security/apparmor"); err == nil && os.Getenv("container") == "" {
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if _, err = os.Stat("/sbin/apparmor_parser"); err == nil {
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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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})
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return appArmorSupported
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}
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