mirror of
https://github.com/opencontainers/runc.git
synced 2026-04-22 23:17:17 +08:00
Kir Kolyshkin
5f4d3f3670
Unfortunately, Go documentation formatter does a sloppy job formatting documentation for variables -- it is rendered as comments (see [1]). Switch to using wrapper functions, solely for the sake of better documentation formatting. [1]: https://pkg.go.dev/github.com/opencontainers/runc@v1.3.0-rc.2/libcontainer/apparmor Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
package apparmor
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"os"
|
|
"sync"
|
|
|
|
"github.com/opencontainers/runc/libcontainer/utils"
|
|
)
|
|
|
|
var (
|
|
appArmorEnabled bool
|
|
checkAppArmor sync.Once
|
|
)
|
|
|
|
// isEnabled returns true if apparmor is enabled for the host.
|
|
func isEnabled() bool {
|
|
checkAppArmor.Do(func() {
|
|
if _, err := os.Stat("/sys/kernel/security/apparmor"); err == nil {
|
|
buf, err := os.ReadFile("/sys/module/apparmor/parameters/enabled")
|
|
appArmorEnabled = err == nil && len(buf) > 1 && buf[0] == 'Y'
|
|
}
|
|
})
|
|
return appArmorEnabled
|
|
}
|
|
|
|
func setProcAttr(attr, value string) error {
|
|
attr = utils.CleanPath(attr)
|
|
attrSubPath := "attr/apparmor/" + attr
|
|
if _, err := os.Stat("/proc/self/" + attrSubPath); errors.Is(err, os.ErrNotExist) {
|
|
// fall back to the old convention
|
|
attrSubPath = "attr/" + attr
|
|
}
|
|
|
|
// Under AppArmor you can only change your own attr, so there's no reason
|
|
// to not use /proc/thread-self/ (instead of /proc/<tid>/, like libapparmor
|
|
// does).
|
|
attrPath, closer := utils.ProcThreadSelf(attrSubPath)
|
|
defer closer()
|
|
|
|
f, err := os.OpenFile(attrPath, os.O_WRONLY, 0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer f.Close()
|
|
|
|
if err := utils.EnsureProcHandle(f); err != nil {
|
|
return err
|
|
}
|
|
|
|
_, err = f.WriteString(value)
|
|
return err
|
|
}
|
|
|
|
// changeOnExec reimplements aa_change_onexec from libapparmor in Go.
|
|
func changeOnExec(name string) error {
|
|
if err := setProcAttr("exec", "exec "+name); err != nil {
|
|
return fmt.Errorf("apparmor failed to apply profile: %w", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// applyProfile will apply the profile with the specified name to the process
|
|
// after the next exec.
|
|
func applyProfile(name string) error {
|
|
if name == "" {
|
|
return nil
|
|
}
|
|
|
|
return changeOnExec(name)
|
|
}
|