nfs/internal/krb5/fuzz_test.go

// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: MIT

package krb5

import (
	"testing"
)

// FuzzAcceptInit feeds arbitrary context establishment tokens through
// the acceptor: no input may panic the DER walk or the crypto, and a
// forged token must fail closed.
func FuzzAcceptInit(f *testing.F) {
	key := make([]byte, 32)
	_, token, err := ClientInit(EtypeAES256, key, "EXAMPLE.ORG", "nfs", "probe")
	if err != nil {
		f.Fatal(err)
	}
	f.Add(token)
	f.Add([]byte{0x6e, 0x00})
	f.Add([]byte{0x6e, 0x20, 0x30, 0x1d, 0x02})
	f.Add(make([]byte, 32))
	f.Fuzz(func(t *testing.T, data []byte) {
		// The property under test is that the acceptor never panics;
		// anything but a genuine token is an error.
		_, _, _ = AcceptInit(data, key)
		_ = (&Context{Etype: EtypeAES256, Key: key}).ClientAcceptRep(data)
	})
}