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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2024 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package testutil
import (
"crypto/sha1"
"encoding/hex"
"fmt"
"io"
"os/exec"
)
func AppArmorParseAndHashHelper(profile string) (string, error) {
p, err := exec.LookPath("apparmor_parser")
if err != nil {
return "", fmt.Errorf("cannot find apparmor_parser in $PATH: %w", err)
}
// Create app_armor parser command with arguments to only return the compiled
// policy to stdout. The profile is not cached or loaded.
apparmorParser := exec.Command(p, "-QKS")
// Get stdin and stdout to pipe the command
apparmorParserStdin, err := apparmorParser.StdinPipe()
if err != nil {
return "", fmt.Errorf("cannot create stdin pipe for apparmor_parser: %w", err)
}
apparmorParserStdout, err := apparmorParser.StdoutPipe()
if err != nil {
return "", fmt.Errorf("cannot create stdout pipe for apparmor_parser: %w", err)
}
// Start apparmor_parser command
if err := apparmorParser.Start(); err != nil {
return "", fmt.Errorf("cannot start apparmor_parser: %w", err)
}
// Write apparmor profile to apparmor_parser stdin
go func() {
defer apparmorParserStdin.Close()
io.WriteString(apparmorParserStdin, profile)
}()
// Calculate the hash
h := sha1.New()
io.Copy(h, apparmorParserStdout)
// Get apparmor_parser command output
if err := apparmorParser.Wait(); err != nil {
if exiterr, ok := err.(*exec.ExitError); ok {
return "", fmt.Errorf("apparmor_parser command exited with status code %v", exiterr.ExitCode())
} else {
return "", fmt.Errorf("cannot wait() for apparmor_parser process: %w", err)
}
}
return hex.EncodeToString(h.Sum(nil)), nil
}
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