mirror of
https://github.com/opencontainers/runc.git
synced 2026-07-11 22:37:14 +08:00
Sascha Grunert
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. Signed-off-by: Sascha Grunert <sgrunert@suse.com>
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
// +build apparmor,linux
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package apparmor
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"github.com/opencontainers/runc/libcontainer/utils"
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)
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// IsEnabled returns true if apparmor is enabled for the host.
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func IsEnabled() bool {
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if _, err := os.Stat("/sys/kernel/security/apparmor"); err == nil {
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buf, err := ioutil.ReadFile("/sys/module/apparmor/parameters/enabled")
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return err == nil && bytes.HasPrefix(buf, []byte("Y"))
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}
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return false
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}
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func setProcAttr(attr, value string) error {
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// Under AppArmor you can only change your own attr, so use /proc/self/
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// instead of /proc/<tid>/ like libapparmor does
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path := fmt.Sprintf("/proc/self/attr/%s", attr)
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f, err := os.OpenFile(path, os.O_WRONLY, 0)
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if err != nil {
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return err
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}
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defer f.Close()
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if err := utils.EnsureProcHandle(f); err != nil {
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return err
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}
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_, err = fmt.Fprintf(f, "%s", value)
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return err
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}
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// changeOnExec reimplements aa_change_onexec from libapparmor in Go
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func changeOnExec(name string) error {
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value := "exec " + name
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if err := setProcAttr("exec", value); err != nil {
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return fmt.Errorf("apparmor failed to apply profile: %s", err)
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}
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return nil
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}
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// ApplyProfile will apply the profile with the specified name to the process after
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// the next exec.
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func ApplyProfile(name string) error {
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if name == "" {
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return nil
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}
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return changeOnExec(name)
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}
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