635 lines
21 KiB
Java
635 lines
21 KiB
Java
// Copyright (C) 2001-2003, 2011, 2022 VeriSign, Inc.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA
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package com.verisignlabs.dnssec.cl;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileFilter;
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import java.io.FileReader;
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import java.io.IOException;
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import java.time.Instant;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Random;
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import org.apache.commons.cli.Option;
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import org.xbill.DNS.DNSKEYRecord;
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import org.xbill.DNS.DNSSEC;
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import org.xbill.DNS.Name;
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import org.xbill.DNS.RRset;
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import org.xbill.DNS.Record;
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import org.xbill.DNS.TextParseException;
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import org.xbill.DNS.Type;
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import org.xbill.DNS.utils.base16;
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import com.verisignlabs.dnssec.security.BINDKeyUtils;
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import com.verisignlabs.dnssec.security.DnsKeyPair;
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import com.verisignlabs.dnssec.security.DnsSecVerifier;
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import com.verisignlabs.dnssec.security.JCEDnsSecSigner;
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import com.verisignlabs.dnssec.security.SignUtils;
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import com.verisignlabs.dnssec.security.ZoneUtils;
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/**
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* This class forms the command line implementation of a DNSSEC zone signer.
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*
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* @author David Blacka
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*/
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public class SignZone extends CLBase {
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private File keyDirectory = null;
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private File keysetDirectory = null;
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private String[] kskFiles = null;
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private String[] keyFiles = null;
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private String zonefile = null;
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private Instant start = null;
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private Instant expire = null;
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private String outputfile = null;
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private boolean verifySigs = false;
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private boolean useOptOut = false;
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private boolean fullySignKeyset = false;
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private List<Name> includeNames = null;
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private boolean useNsec3 = false;
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private byte[] salt = null;
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private int iterations = 0;
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private int digestId = DNSSEC.Digest.SHA256;
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private long nsec3paramttl = -1;
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private boolean verboseSigning = false;
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private static final Random rand = new Random();
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public SignZone(String name, String usageStr) {
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super(name, usageStr);
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}
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protected void setupOptions() {
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// boolean options
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opts.addOption("a", "verify", false, "verify generated signatures>");
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opts.addOption("F", "fully-sign-keyset", false,
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"sign the zone apex keyset with all available keys.");
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opts.addOption("V", "verbose-signing", false, "Display verbose signing activity.");
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opts.addOption(Option.builder("d").hasArg().argName("dir").longOpt("keyset-directory")
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.desc("directory to find keyset files (default '.')").build());
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opts.addOption(Option.builder("D").hasArg().argName("dir").longOpt("key-directory")
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.desc("directory to find key files (default '.'").build());
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opts.addOption(Option.builder("s").hasArg().argName("time/offset").longOpt("start-time")
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.desc("signature starting time (default is now - 1 hour)").build());
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opts.addOption(Option.builder("e").hasArg().argName("time/offset").longOpt("expire-time")
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.desc("signature expiration time (default is start-time + 30 days)").build());
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opts.addOption(
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Option.builder("f").hasArg().argName("outfile").desc("file the the signed rrset is written to").build());
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opts.addOption(Option.builder("k").hasArgs().argName("KSK file").longOpt("ksk-file")
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.desc("This key is a Key-Signing Key (may repeat)").build());
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opts.addOption(Option.builder("I").hasArg().argName("file").longOpt("include-file")
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.desc("include names in the file in the NSEC/NSEC3 chain").build());
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// NSEC3 options
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opts.addOption("3", "use-nsec3", false, "use NSEC3 instead of NSEC");
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opts.addOption("O", "use-opt-out", false,
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"generate a fully Opt-Out zone (only valid with NSEC3).");
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opts.addOption(
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Option.builder("S").hasArg().argName("hex value").longOpt("salt").desc("Supply a salt value").build());
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opts.addOption(Option.builder("R").hasArg().argName("length").longOpt("random-salt")
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.desc("Generate a random salt of <length>").build());
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opts.addOption(Option.builder("H").hasArg().argName("count").longOpt("iterations")
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.desc("Use this many addtional iterations in NSEC3 (default 0)").build());
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opts.addOption(Option.builder().hasArg().longOpt("nsec3paramttl").argName("ttl")
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.desc("Use this TTL for the NSEC3PARAM record (default is min(soa.min, soa.ttl))").build());
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opts.addOption(Option.builder().hasArg().argName("id").longOpt("ds-digest")
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.desc("Digest algorithm to use for generated DS records").build());
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}
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protected void processOptions() {
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String[] verifyOptionKeys = { "verify_signatures", "verify" };
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String[] nsec3OptionKeys = { "use_nsec3", "nsec3" };
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String[] optOutOptionKeys = { "use_opt_out", "opt_out" };
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String[] verboseSigningOptionKeys = { "verbose_signing" };
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String[] fullySignKeysetOptionKeys = { "fully_sign_keyset", "fully_sign" };
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String[] keyDirectoryOptionKeys = { "key_directory", "keydir" };
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String[] inceptionOptionKeys = { "inception", "start" };
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String[] expireOptionKeys = { "expire" };
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String[] nsec3SaltOptionKeys = { "nsec3_salt", "salt" };
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String[] randomSaltOptionKeys = { "nsec3_random_salt_length", "nsec3_salt_length", "random_salt_length" };
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String[] nsec3IterationsOptionKeys = { "nsec3_iterations", "iterations" };
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String[] digestAlgOptionKeys = { "digest_algorithm", "digest_id" };
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String[] nsec3paramTTLOptionKeys = { "nsec3param_ttl" };
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String[] incudeNamesOptionKeys = { "include_names_file", "include_names" };
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String optstr = null;
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verifySigs = cliBooleanOption("a", verifyOptionKeys, false);
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useNsec3 = cliBooleanOption("3", nsec3OptionKeys, false);
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useOptOut = cliBooleanOption("O", optOutOptionKeys, false);
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verboseSigning = cliBooleanOption("V", verboseSigningOptionKeys, false);
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if (useOptOut && !useNsec3) {
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System.err.println("Opt-Out not supported without NSEC3 -- ignored.");
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useOptOut = false;
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}
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fullySignKeyset = cliBooleanOption("F", fullySignKeysetOptionKeys, false);
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optstr = cliOption("D", keyDirectoryOptionKeys, null);
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if (optstr != null) {
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keyDirectory = new File(optstr);
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if (!keyDirectory.isDirectory()) {
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fail("key directory " + optstr + " is not a directory");
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}
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}
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try {
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optstr = cliOption("s", inceptionOptionKeys, null);
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if (optstr != null) {
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start = Utils.convertDuration(null, optstr);
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} else {
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// default is now - 1 hour.
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start = Instant.now().minusSeconds(3600);
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}
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} catch (java.text.ParseException e) {
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fail("unable to parse start time specifiction: " + e);
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}
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try {
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optstr = cliOption("e", expireOptionKeys, null);
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if (optstr != null) {
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expire = Utils.convertDuration(start, optstr);
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} else {
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expire = Utils.convertDuration(start, "+2592000"); // 30 days
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}
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} catch (java.text.ParseException e) {
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fail("missing zone file and/or key files");
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}
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outputfile = cli.getOptionValue('f');
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kskFiles = cli.getOptionValues('k');
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optstr = cliOption("S", nsec3SaltOptionKeys, null);
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if (optstr != null) {
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salt = base16.fromString(optstr);
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if (salt == null && !optstr.equals("-")) {
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fail("salt is not valid hexidecimal");
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}
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}
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optstr = cliOption("R", randomSaltOptionKeys, null);
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if (optstr != null) {
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int length = Utils.parseInt(optstr, 0);
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if (length > 0 && length <= 255) {
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salt = new byte[length];
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rand.nextBytes(salt);
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}
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}
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iterations = cliIntOption("iterations", nsec3IterationsOptionKeys, 0);
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if (iterations > 150) {
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log.warning("NSEC3 iterations value is too high for normal use: " + iterations
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+ " is greater than current accepted threshold of 150");
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}
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optstr = cliOption("ds-digest", digestAlgOptionKeys, Integer.toString(digestId));
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digestId = DNSSEC.Digest.value(optstr);
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nsec3paramttl = cliIntOption("nsec3paramttl", nsec3paramTTLOptionKeys, -1);
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optstr = cliOption("I", incudeNamesOptionKeys, null);
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if (optstr != null) {
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File includeNamesFile = new File(optstr);
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try {
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includeNames = getNameList(includeNamesFile);
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} catch (IOException e) {
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fail("unable to load include-names file: " + e);
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}
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}
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String[] files = cli.getArgs();
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if (files.length < 1) {
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fail("missing zone file and/or key files");
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}
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zonefile = files[0];
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if (files.length > 1) {
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keyFiles = new String[files.length - 1];
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System.arraycopy(files, 1, keyFiles, 0, files.length - 1);
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}
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log.fine("SignZone settings => key_directory: " + keyDirectory +
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", keyset_directory: " + keysetDirectory +
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", start: " + start.getEpochSecond() +
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", expire: " + expire.getEpochSecond() +
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", verify_sigs: " + verifySigs +
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", use_nsec3: " + useNsec3 +
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", use_opt_out = " + useOptOut +
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", salt: " + DnsKeyPair.toHex(salt) +
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", iterations: " + iterations +
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", nsec3param_ttl: " + nsec3paramttl +
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", fully_sign_keyset: " + fullySignKeyset +
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", digest_id: " + digestId +
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", verbose_signing: " + verboseSigning);
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}
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/**
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* Load a list of DNS names from a file.
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*
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* @param nameListFile the path of a file containing a bare list of DNS
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* names.
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* @return a list of {@link org.xbill.DNS.Name} objects.
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*/
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private List<Name> getNameList(File nameListFile) throws IOException {
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try (BufferedReader br = new BufferedReader(new FileReader(nameListFile))) {
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List<Name> res = new ArrayList<>();
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String line = null;
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while ((line = br.readLine()) != null) {
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try {
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Name n = Name.fromString(line);
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// force the name to be absolute.
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if (!n.isAbsolute())
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n = Name.concatenate(n, Name.root);
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res.add(n);
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} catch (TextParseException e) {
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log.severe("DNS Name parsing error:" + e);
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}
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}
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return res;
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}
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}
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/**
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* Verify the generated signatures.
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*
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* @param records a list of {@link org.xbill.DNS.Record}s.
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* @param keypairs a list of keypairs used the sign the zone.
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* @return true if all of the signatures validated.
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*/
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private boolean verifyZoneSigs(List<Record> records,
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List<DnsKeyPair> keypairs, List<DnsKeyPair> kskpairs) {
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boolean secure = true;
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DnsSecVerifier verifier = new DnsSecVerifier();
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for (DnsKeyPair pair : keypairs) {
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verifier.addTrustedKey(pair);
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}
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for (DnsKeyPair pair : kskpairs) {
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verifier.addTrustedKey(pair);
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}
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verifier.setVerifyAllSigs(true);
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List<RRset> rrsets = SignUtils.assembleIntoRRsets(records);
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for (RRset rrset : rrsets) {
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// skip unsigned rrsets.
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if (rrset.sigs().isEmpty()) {
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continue;
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}
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boolean result = verifier.verify(rrset);
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if (!result) {
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System.err.println("Signatures did not verify for RRset: " + rrset);
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log.fine("Signatures did not verify for RRset: " + rrset);
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secure = false;
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}
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}
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return secure;
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}
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/**
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* Load the key pairs from the key files.
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*
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* @param keyfiles a string array containing the base names or paths of the
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* keys to be loaded.
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* @param startIndex the starting index of keyfiles string array to use. This
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* allows us to use the straight command line argument
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* array.
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* @param inDirectory the directory to look in (may be null).
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* @return a list of keypair objects.
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*/
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private List<DnsKeyPair> getKeys(String[] keyfiles, int startIndex,
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File inDirectory) throws IOException {
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if (keyfiles == null)
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return new ArrayList<>();
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int len = keyfiles.length - startIndex;
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if (len <= 0)
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return new ArrayList<>();
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ArrayList<DnsKeyPair> keys = new ArrayList<>(len);
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for (int i = startIndex; i < keyfiles.length; i++) {
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DnsKeyPair k = BINDKeyUtils.loadKeyPair(keyfiles[i], inDirectory);
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if (k != null) {
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keys.add(k);
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}
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}
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return keys;
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}
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private List<DnsKeyPair> getKeys(List<Record> dnskeyrrs, File inDirectory)
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throws IOException {
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List<DnsKeyPair> res = new ArrayList<>();
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for (Record r : dnskeyrrs) {
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if (r.getType() != Type.DNSKEY)
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continue;
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// Construct a public-key-only DnsKeyPair just so we can calculate the
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// base name.
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DnsKeyPair pub = new DnsKeyPair((DNSKEYRecord) r);
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DnsKeyPair pair = BINDKeyUtils.loadKeyPair(BINDKeyUtils.keyFileBase(pub),
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inDirectory);
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if (pair != null) {
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res.add(pair);
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}
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}
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return res;
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}
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private static class KeyFileFilter implements FileFilter {
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private String prefix;
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public KeyFileFilter(Name origin) {
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prefix = "K" + origin.toString();
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}
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public boolean accept(File pathname) {
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if (!pathname.isFile())
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return false;
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String name = pathname.getName();
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return (name.startsWith(prefix) && name.endsWith(".private"));
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}
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}
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private List<DnsKeyPair> findZoneKeys(File inDirectory, Name zonename)
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throws IOException {
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if (inDirectory == null) {
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inDirectory = new File(".");
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}
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// get the list of "K<zone>.*.private files.
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FileFilter filter = new KeyFileFilter(zonename);
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File[] files = inDirectory.listFiles(filter);
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// read in all of the records
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ArrayList<DnsKeyPair> keys = new ArrayList<>();
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for (int i = 0; i < files.length; i++) {
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DnsKeyPair p = BINDKeyUtils.loadKeyPair(files[i].getName(), inDirectory);
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keys.add(p);
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}
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return keys;
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}
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/**
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* This is an implementation of a file filter used for finding BIND 9-style
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* keyset-* files.
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*/
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private static class KeysetFileFilter implements FileFilter {
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public boolean accept(File pathname) {
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if (!pathname.isFile())
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return false;
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String name = pathname.getName();
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return (name.startsWith("keyset-"));
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}
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}
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/**
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* Load keysets (which contain delegation point security info).
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*
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* @param inDirectory the directory to look for the keyset files (may be null,
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* in which case it defaults to looking in the current
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* working directory).
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* @param zonename the name of the zone we are signing, so we can ignore
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* keysets that do not belong in the zone.
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* @return a list of {@link org.xbill.DNS.Record}s found in the keyset files.
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*/
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private List<Record> getKeysets(File inDirectory, Name zonename)
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throws IOException {
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if (inDirectory == null) {
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inDirectory = new File(".");
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}
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// get the list of "keyset-" files.
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FileFilter filter = new KeysetFileFilter();
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File[] files = inDirectory.listFiles(filter);
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// read in all of the records
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ArrayList<Record> keysetRecords = new ArrayList<>();
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for (int i = 0; i < files.length; i++) {
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List<Record> l = ZoneUtils.readZoneFile(files[i].getAbsolutePath(), zonename);
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keysetRecords.addAll(l);
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}
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// discard records that do not belong to the zone in question.
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for (Iterator<Record> i = keysetRecords.iterator(); i.hasNext();) {
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Record r = i.next();
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if (!r.getName().subdomain(zonename)) {
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i.remove();
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}
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}
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return keysetRecords;
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}
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/**
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* Determine if the given keypairs can be used to sign the zone.
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*
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* @param zonename the zone origin.
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* @param keypairs a list of {@link DnsKeyPair} objects that will be used to
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* sign the zone.
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* @return true if the keypairs valid.
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*/
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private static boolean keyPairsValidForZone(Name zonename, List<DnsKeyPair> keypairs) {
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if (keypairs == null)
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return true; // technically true, I guess.
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for (DnsKeyPair kp : keypairs) {
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Name keyname = kp.getDNSKEYRecord().getName();
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if (!keyname.equals(zonename)) {
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return false;
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}
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}
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return true;
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}
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public void execute() throws Exception {
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// Do a basic existence check for the zonefile first.
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if (!zonefile.equals("-")) {
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File f = new File(zonefile);
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if (!f.exists()) {
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fail("zonefile '" + zonefile + "' does not exist");
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}
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}
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// Read in the zone
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List<Record> records = ZoneUtils.readZoneFile(zonefile, null);
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if (records == null || records.isEmpty()) {
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|
fail("empty zone file");
|
|
}
|
|
|
|
// calculate the zone name.
|
|
Name zonename = ZoneUtils.findZoneName(records);
|
|
if (zonename == null) {
|
|
fail("invalid zone file - no SOA");
|
|
}
|
|
|
|
// Load the key pairs. Note that getKeys() always returns an ArrayList,
|
|
// which may be empty.
|
|
List<DnsKeyPair> keypairs = getKeys(keyFiles, 0, keyDirectory);
|
|
List<DnsKeyPair> kskpairs = getKeys(kskFiles, 0, keyDirectory);
|
|
|
|
// If we didn't get any keys on the command line, look at the zone apex for
|
|
// any public keys.
|
|
if (keypairs.isEmpty()) {
|
|
List<Record> dnskeys = ZoneUtils.findRRs(records, zonename, Type.DNSKEY);
|
|
keypairs = getKeys(dnskeys, keyDirectory);
|
|
}
|
|
|
|
// If we *still* don't have any key pairs, look for keys the key directory
|
|
// that match
|
|
if (keypairs.isEmpty()) {
|
|
keypairs = findZoneKeys(keyDirectory, zonename);
|
|
}
|
|
|
|
// If we don't have any KSKs, but we do have more than one zone
|
|
// signing key (presumably), presume that the zone signing keys
|
|
// are just not differentiated and try to figure out which keys
|
|
// are actually KSKs by looking at the SEP flag.
|
|
if (kskpairs.isEmpty() && !keypairs.isEmpty()) {
|
|
for (Iterator<DnsKeyPair> i = keypairs.iterator(); i.hasNext();) {
|
|
DnsKeyPair pair = i.next();
|
|
DNSKEYRecord kr = pair.getDNSKEYRecord();
|
|
if ((kr.getFlags() & DNSKEYRecord.Flags.SEP_KEY) != 0) {
|
|
kskpairs.add(pair);
|
|
i.remove();
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we have zero keypairs at all, we are stuck.
|
|
if (keypairs.isEmpty() && kskpairs.isEmpty()) {
|
|
fail("no zone signing keys could be determined");
|
|
}
|
|
|
|
// If we only have one type of key (all ZSKs or all KSKs), then these are
|
|
// "CSKs" -- Combined signing keys, so assign one set to the other.
|
|
if (keypairs.isEmpty()) {
|
|
keypairs = kskpairs;
|
|
} else if (kskpairs.isEmpty()) {
|
|
kskpairs = keypairs;
|
|
}
|
|
|
|
// Output what keys we are using for what
|
|
if (keypairs == kskpairs) {
|
|
System.out.println("CSKs: ");
|
|
for (DnsKeyPair kp : keypairs) {
|
|
System.out.println(" - " + kp);
|
|
}
|
|
} else {
|
|
System.out.println("KSKs: ");
|
|
for (DnsKeyPair kp : kskpairs) {
|
|
System.out.println(" - " + kp);
|
|
}
|
|
System.out.println("ZSKs: ");
|
|
for (DnsKeyPair kp : keypairs) {
|
|
System.out.println(" - " + kp);
|
|
}
|
|
}
|
|
|
|
// default the output file, if not set.
|
|
if (outputfile == null && !zonefile.equals("-")) {
|
|
if (zonename.isAbsolute()) {
|
|
outputfile = zonename + "signed";
|
|
} else {
|
|
outputfile = zonename + ".signed";
|
|
}
|
|
}
|
|
|
|
// Verify that the keys can be in the zone.
|
|
if (!keyPairsValidForZone(zonename, keypairs)
|
|
|| !keyPairsValidForZone(zonename, kskpairs)) {
|
|
fail("specified keypairs are not valid for the zone.");
|
|
}
|
|
|
|
// We force the signing keys to be in the zone by just appending
|
|
// them to the zone here. Currently JCEDnsSecSigner.signZone
|
|
// removes duplicate records.
|
|
if (!kskpairs.isEmpty()) {
|
|
for (DnsKeyPair pair : kskpairs) {
|
|
records.add(pair.getDNSKEYRecord());
|
|
}
|
|
}
|
|
if (!keypairs.isEmpty()) {
|
|
for (DnsKeyPair pair : keypairs) {
|
|
records.add(pair.getDNSKEYRecord());
|
|
}
|
|
}
|
|
|
|
// read in the keysets, if any.
|
|
List<Record> keysetrecs = getKeysets(keysetDirectory, zonename);
|
|
if (keysetrecs != null) {
|
|
records.addAll(keysetrecs);
|
|
}
|
|
|
|
JCEDnsSecSigner signer = new JCEDnsSecSigner(verboseSigning);
|
|
|
|
// Sign the zone.
|
|
List<Record> signedRecords;
|
|
|
|
if (useNsec3) {
|
|
signedRecords = signer.signZoneNSEC3(zonename, records, kskpairs, keypairs,
|
|
start, expire,
|
|
fullySignKeyset, useOptOut,
|
|
includeNames, salt,
|
|
iterations, digestId,
|
|
nsec3paramttl);
|
|
} else {
|
|
signedRecords = signer.signZone(zonename, records, kskpairs, keypairs,
|
|
start, expire, fullySignKeyset,
|
|
digestId);
|
|
}
|
|
|
|
// write out the signed zone
|
|
ZoneUtils.writeZoneFile(signedRecords, outputfile);
|
|
System.out.println("zone signing complete");
|
|
|
|
if (verifySigs) {
|
|
log.fine("verifying generated signatures");
|
|
boolean res = verifyZoneSigs(signedRecords, keypairs, kskpairs);
|
|
|
|
if (res) {
|
|
System.out.println("Generated signatures verified");
|
|
} else {
|
|
System.out.println("Generated signatures did not verify.");
|
|
}
|
|
}
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
SignZone tool = new SignZone("signzone", "jdnssec-signzone [..options..] zone_file [key_file ...]");
|
|
|
|
tool.run(args);
|
|
}
|
|
}
|