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package apparmor
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"github.com/google/uuid"
"github.com/lxc/incus/v6/internal/server/sys"
internalUtil "github.com/lxc/incus/v6/internal/util"
"github.com/lxc/incus/v6/shared/revert"
)
// ArchiveWrapper is used as a RunWrapper in the rsync package.
func ArchiveWrapper(sysOS *sys.OS, cmd *exec.Cmd, output string, allowedCmds []string) (func(), error) {
if !sysOS.AppArmorAvailable {
return func() {}, nil
}
reverter := revert.New()
defer reverter.Fail()
// Load the profile.
profileName, err := archiveProfileLoad(sysOS, output, allowedCmds)
if err != nil {
return nil, fmt.Errorf("Failed to load apparmor profile: %w", err)
}
reverter.Add(func() { _ = deleteProfile(sysOS, profileName, profileName) })
// Resolve aa-exec.
execPath, err := exec.LookPath("aa-exec")
if err != nil {
return nil, err
}
// Override the command.
newArgs := []string{"aa-exec", "-p", profileName}
newArgs = append(newArgs, cmd.Args...)
cmd.Args = newArgs
cmd.Path = execPath
// All done, setup a cleanup function and disarm reverter.
cleanup := func() {
_ = deleteProfile(sysOS, profileName, profileName)
}
reverter.Success()
return cleanup, nil
}
func archiveProfileLoad(sysOS *sys.OS, output string, allowedCommandPaths []string) (string, error) {
reverter := revert.New()
defer reverter.Fail()
// Generate a temporary profile name.
name := profileName("archive", uuid.New().String())
profilePath := filepath.Join(aaPath, "profiles", name)
// Generate the profile
content, err := archiveProfile(name, output, allowedCommandPaths)
if err != nil {
return "", err
}
// Write it to disk.
err = os.WriteFile(profilePath, []byte(content), 0o600)
if err != nil {
return "", err
}
reverter.Add(func() { os.Remove(profilePath) })
// Load it.
err = loadProfile(sysOS, name)
if err != nil {
return "", err
}
reverter.Success()
return name, nil
}
// archiveProfile generates the AppArmor profile template from the given destination path.
func archiveProfile(name string, outputPath string, allowedCommandPaths []string) (string, error) {
// Attempt to deref all paths.
outputPathFull, err := filepath.EvalSymlinks(outputPath)
if err != nil {
outputPathFull = outputPath // Use requested path if cannot resolve it.
}
backupsPath := internalUtil.VarPath("backups")
backupsPathFull, err := filepath.EvalSymlinks(backupsPath)
if err == nil {
backupsPath = backupsPathFull
}
imagesPath := internalUtil.VarPath("images")
imagesPathFull, err := filepath.EvalSymlinks(imagesPath)
if err == nil {
imagesPath = imagesPathFull
}
derefCommandPaths := make([]string, len(allowedCommandPaths))
for i, cmd := range allowedCommandPaths {
cmdPath, err := exec.LookPath(cmd)
if err == nil {
cmd = cmdPath
}
cmdFull, err := filepath.EvalSymlinks(cmd)
if err == nil {
derefCommandPaths[i] = cmdFull
} else {
derefCommandPaths[i] = cmd
}
}
// Render the profile.
var sb *strings.Builder = &strings.Builder{}
err = archiveProfileTpl.Execute(sb, map[string]any{
"name": name,
"outputPath": outputPathFull, // Use deferenced path in AppArmor profile.
"backupsPath": backupsPath,
"imagesPath": imagesPath,
"allowedCommandPaths": derefCommandPaths,
})
if err != nil {
return "", err
}
return sb.String(), nil
}
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