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108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
// +build linux
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package apparmor
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import (
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"bufio"
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"io"
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"os"
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"path"
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"strings"
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"github.com/docker/docker/pkg/aaparser"
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"github.com/docker/docker/utils/templates"
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)
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var (
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// profileDirectory is the file store for apparmor profiles and macros.
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profileDirectory = "/etc/apparmor.d"
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// defaultProfilePath is the default path for the apparmor profile to be saved.
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defaultProfilePath = path.Join(profileDirectory, "docker")
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)
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// profileData holds information about the given profile for generation.
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type profileData struct {
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// Name is profile name.
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Name string
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// ExecPath is the path to the docker binary.
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ExecPath string
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// Imports defines the apparmor functions to import, before defining the profile.
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Imports []string
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// InnerImports defines the apparmor functions to import in the profile.
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InnerImports []string
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// Version is the {major, minor, patch} version of apparmor_parser as a single number.
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Version int
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}
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// generateDefault creates an apparmor profile from ProfileData.
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func (p *profileData) generateDefault(out io.Writer) error {
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compiled, err := templates.NewParse("apparmor_profile", baseTemplate)
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if err != nil {
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return err
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}
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if macroExists("tunables/global") {
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p.Imports = append(p.Imports, "#include <tunables/global>")
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} else {
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p.Imports = append(p.Imports, "@{PROC}=/proc/")
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}
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if macroExists("abstractions/base") {
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p.InnerImports = append(p.InnerImports, "#include <abstractions/base>")
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}
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if err := compiled.Execute(out, p); err != nil {
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return err
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}
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return nil
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}
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// macrosExists checks if the passed macro exists.
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func macroExists(m string) bool {
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_, err := os.Stat(path.Join(profileDirectory, m))
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return err == nil
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}
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// InstallDefault generates a default profile and installs it in the
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// ProfileDirectory with `apparmor_parser`.
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func InstallDefault(name string) error {
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// Make sure the path where they want to save the profile exists
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if err := os.MkdirAll(profileDirectory, 0755); err != nil {
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return err
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}
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p := profileData{
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Name: name,
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}
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f, err := os.OpenFile(defaultProfilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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return err
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}
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if err := p.generateDefault(f); err != nil {
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f.Close()
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return err
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}
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f.Close()
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if err := aaparser.LoadProfile(defaultProfilePath); err != nil {
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return err
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}
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return nil
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}
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// IsLoaded checks if a passed profile has been loaded into the kernel.
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func IsLoaded(name string) error {
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file, err := os.Open("/sys/kernel/security/apparmor/profiles")
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if err != nil {
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return err
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}
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r := bufio.NewReader(file)
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for {
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p, err := r.ReadString('\n')
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if err != nil {
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return err
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}
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if strings.HasPrefix(p, name+" ") {
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return nil
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}
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}
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}
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