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Sebastiaan van Stijn
c064304692
This prevents having to maintain GoDoc for the stub implementations, and makes sure that the "stub" implementations have the same signature as the "non-stub" versions. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
package apparmor
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"sync"
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"github.com/opencontainers/runc/libcontainer/utils"
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)
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var (
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appArmorEnabled bool
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checkAppArmor sync.Once
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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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checkAppArmor.Do(func() {
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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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appArmorEnabled = err == nil && len(buf) > 1 && buf[0] == 'Y'
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}
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})
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return appArmorEnabled
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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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attrPath := "/proc/self/attr/apparmor/" + attr
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if _, err := os.Stat(attrPath); errors.Is(err, os.ErrNotExist) {
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// fall back to the old convention
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attrPath = "/proc/self/attr/" + attr
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}
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f, err := os.OpenFile(attrPath, 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 = f.WriteString(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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if err := setProcAttr("exec", "exec "+name); 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. It is only supported on Linux and produces an error on other
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// platforms.
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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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