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// +build linux,apparmor
package apparmor
import (
"bufio"
"io"
"io/ioutil"
"os"
"path"
"strings"
"text/template"
runcaa "github.com/opencontainers/runc/libcontainer/apparmor"
)
// IsEnabled returns true if AppArmor is enabled on the host.
func IsEnabled() bool {
return runcaa.IsEnabled()
}
// profileData holds information about the given profile for generation.
type profileData struct {
// Name is profile name.
Name string
// Imports defines the apparmor functions to import, before defining the profile.
Imports []string
// InnerImports defines the apparmor functions to import in the profile.
InnerImports []string
// Version is the {major, minor, patch} version of apparmor_parser as a single number.
Version int
}
// generateDefault creates an apparmor profile from ProfileData.
func (p *profileData) generateDefault(out io.Writer) error {
compiled, err := template.New("apparmor_profile").Parse(libpodProfileTemplate)
if err != nil {
return err
}
if macroExists("tunables/global") {
p.Imports = append(p.Imports, "#include <tunables/global>")
} else {
p.Imports = append(p.Imports, "@{PROC}=/proc/")
}
if macroExists("abstractions/base") {
p.InnerImports = append(p.InnerImports, "#include <abstractions/base>")
}
ver, err := getVersion()
if err != nil {
return err
}
p.Version = ver
return compiled.Execute(out, p)
}
// macrosExists checks if the passed macro exists.
func macroExists(m string) bool {
_, err := os.Stat(path.Join(profileDirectory, m))
return err == nil
}
// InstallDefault generates a default profile in a temp directory determined by
// os.TempDir(), then loads the profile into the kernel using 'apparmor_parser'.
func InstallDefault(name string) error {
p := profileData{
Name: name,
}
// Install to a temporary directory.
f, err := ioutil.TempFile("", name)
if err != nil {
return err
}
profilePath := f.Name()
defer f.Close()
defer os.Remove(profilePath)
if err := p.generateDefault(f); err != nil {
return err
}
return loadProfile(profilePath)
}
// IsLoaded checks if a profile with the given name has been loaded into the
// kernel.
func IsLoaded(name string) (bool, error) {
file, err := os.Open("/sys/kernel/security/apparmor/profiles")
if err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
defer file.Close()
r := bufio.NewReader(file)
for {
p, err := r.ReadString('\n')
if err == io.EOF {
break
}
if err != nil {
return false, err
}
if strings.HasPrefix(p, name+" ") {
return true, nil
}
}
return false, nil
}
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