294 lines
8.9 KiB
Java
294 lines
8.9 KiB
Java
package com.verisign.cl;
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import java.io.BufferedReader;
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import java.io.FileReader;
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import java.io.IOException;
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import java.util.*;
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import org.xbill.DNS.*;
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import com.verisign.tat.dnssec.CaptiveValidator;
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import com.verisign.tat.dnssec.SecurityStatus;
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public class DNSSECReconciler {
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/**
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* Invoke with java -jar dnssecreconciler.jar server=127.0.0.1 \
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* query_file=queries.txt dnskey_query=net dnskey_query=edu
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*/
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private CaptiveValidator validator;
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private SimpleResolver resolver;
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private BufferedReader queryStream;
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private Set<Name> zoneNames;
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// Options
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public String server;
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public String query;
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public String queryFile;
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public String dnskeyFile;
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public List<String> dnskeyNames;
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DNSSECReconciler() {
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validator = new CaptiveValidator();
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}
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/**
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* Convert a query line of the form: <qname> <qtype> <flags> to a request
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* message.
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*
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* @param query_line
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* @return A query message
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* @throws TextParseException
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* @throws NameTooLongException
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*/
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private Message queryFromString(String query_line)
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throws TextParseException, NameTooLongException {
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String[] tokens = query_line.split("[ \t]+");
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Name qname = null;
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int qtype = -1;
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int qclass = -1;
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if (tokens.length < 1)
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return null;
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qname = Name.fromString(tokens[0]);
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if (!qname.isAbsolute()) {
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qname = Name.concatenate(qname, Name.root);
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}
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for (int i = 1; i < tokens.length; i++) {
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if (tokens[i].startsWith("+")) {
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// For now, we ignore flags as uninteresting
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continue;
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}
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int type = Type.value(tokens[i]);
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if (type > 0) {
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qtype = type;
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continue;
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}
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int cls = DClass.value(tokens[i]);
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if (cls > 0) {
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qclass = cls;
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continue;
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}
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}
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if (qtype < 0) {
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qtype = Type.A;
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}
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if (qclass < 0) {
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qclass = DClass.IN;
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}
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Message query = Message
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.newQuery(Record.newRecord(qname, qtype, qclass));
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return query;
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}
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/**
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* Fetch the next query from either the command line or the query file
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*
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* @return a query Message, or null if the query list is exhausted
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* @throws IOException
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*/
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private Message nextQuery() throws IOException {
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if (query != null) {
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Message res = queryFromString(query);
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query = null;
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return res;
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}
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if (queryStream == null && queryFile != null) {
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queryStream = new BufferedReader(new FileReader(queryFile));
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}
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if (queryStream != null) {
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String line = queryStream.readLine();
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if (line == null)
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return null;
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return queryFromString(line);
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}
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return null;
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}
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/**
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* Figure out the correct zone from the query by comparing the qname to the
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* list of trusted DNSKEY owner names.
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*
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* @param query
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* @return a zone name
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* @throws IOException
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*/
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private Name zoneFromQuery(Message query) throws IOException {
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if (zoneNames == null) {
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zoneNames = new HashSet<Name>();
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for (String key : validator.listTrustedKeys()) {
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String[] components = key.split("/");
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Name keyname = Name.fromString(components[0]);
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if (! keyname.isAbsolute()) {
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keyname = Name.concatenate(keyname, Name.root);
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}
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zoneNames.add(keyname);
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}
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}
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Name qname = query.getQuestion().getName();
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for (Name n : zoneNames) {
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if (qname.subdomain(n)) {
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return n;
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}
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}
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return null;
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}
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public void execute() throws IOException {
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// Configure our resolver
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resolver = new SimpleResolver(server);
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resolver.setEDNS(0, 4096, Flags.DO, null);
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// Prime the validator
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if (dnskeyFile != null) {
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validator.addTrustedKeysFromFile(dnskeyFile);
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} else {
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for (String name : dnskeyNames) {
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Message query = queryFromString(name + " DNSKEY");
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Message response = resolver.send(query);
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validator.addTrustedKeysFromResponse(response);
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}
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}
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// Log our set of trusted keys
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for (String key : validator.listTrustedKeys()) {
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System.out.println("Trusted Key: " + key);
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}
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// Iterate over all queries
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Message query = nextQuery();
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while (query != null) {
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Message response = resolver.send(query);
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if (response == null) {
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continue;
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}
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Name zone = zoneFromQuery(query);
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byte result = validator.validateMessage(response, zone.toString());
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switch (result) {
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case SecurityStatus.BOGUS:
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case SecurityStatus.INVALID:
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System.out.println("BOGUS Answer:");
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System.out.println("Query: " + query.getQuestion());
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System.out.println("Response:\n" + response);
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for (String err : validator.getErrorList()) {
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System.out.println("Error: " + err);
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}
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System.out.println("");
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break;
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case SecurityStatus.INSECURE:
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case SecurityStatus.INDETERMINATE:
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case SecurityStatus.UNCHECKED:
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System.out.println("Insecure Answer:");
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System.out.println("Query: " + query.getQuestion());
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System.out.println("Response:\n" + response);
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for (String err : validator.getErrorList()) {
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System.out.println("Error: " + err);
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}
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break;
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case SecurityStatus.SECURE:
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break;
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}
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query = nextQuery();
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}
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}
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private static void usage() {
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System.err
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.println("usage: java -jar dnssecreconiler.jar [..options..]");
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System.err.println(" server: the DNS server to query.");
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System.err.println(" query: a name [type [flags]] string.");
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System.err
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.println(" query_file: a list of queries, one query per line.");
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System.err
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.println(" dnskey_file: a file containing DNSKEY RRs to trust.");
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System.err
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.println(" dnskey_query: query 'server' for DNSKEY at given name to trust, may repeat");
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}
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public static void main(String[] argv) {
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DNSSECReconciler dr = new DNSSECReconciler();
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try {
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// Parse the command line options
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for (String arg : argv) {
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if (arg.indexOf('=') < 0) {
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System.err.println("Unrecognized option: " + arg);
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usage();
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System.exit(1);
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}
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String[] split_arg = arg.split("=", 2);
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String opt = split_arg[0];
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String optarg = split_arg[1];
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if (opt.equals("server")) {
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dr.server = optarg;
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} else if (opt.equals("query")) {
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dr.query = optarg;
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} else if (opt.equals("query_file")) {
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dr.queryFile = optarg;
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} else if (opt.equals("dnskey_file")) {
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dr.dnskeyFile = optarg;
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} else if (opt.equals("dnskey_query")) {
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if (dr.dnskeyNames == null) {
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dr.dnskeyNames = new ArrayList<String>();
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}
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dr.dnskeyNames.add(optarg);
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} else {
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System.err.println("Unrecognized option: " + opt);
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usage();
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System.exit(1);
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}
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}
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// Check for minimum usage
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if (dr.server == null) {
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System.err.println("'server' must be specified");
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usage();
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System.exit(1);
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}
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if (dr.query == null && dr.queryFile == null) {
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System.err
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.println("Either 'query' or 'query_file' must be specified");
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usage();
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System.exit(1);
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}
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if (dr.dnskeyFile == null && dr.dnskeyNames == null) {
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System.err
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.println("Either 'dnskey_file' or 'dnskey_query' must be specified");
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usage();
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System.exit(1);
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}
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// Execute the job
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dr.execute();
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} catch (Exception e) {
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e.printStackTrace();
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System.exit(1);
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}
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}
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}
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