148 lines
4.5 KiB
Java
148 lines
4.5 KiB
Java
/*
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* Copyright (C) 2017 Schürmann & Breitmoser GbR
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sufficientlysecure.keychain.linked.resources;
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import android.content.Context;
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import android.support.annotation.DrawableRes;
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import android.support.annotation.StringRes;
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import org.sufficientlysecure.keychain.R;
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import org.sufficientlysecure.keychain.operations.results.OperationResult.OperationLog;
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import org.sufficientlysecure.keychain.linked.LinkedTokenResource;
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import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;
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import java.net.URI;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import de.measite.minidns.Client;
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import de.measite.minidns.DNSMessage;
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import de.measite.minidns.Question;
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import de.measite.minidns.Record;
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import de.measite.minidns.Record.CLASS;
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import de.measite.minidns.Record.TYPE;
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import de.measite.minidns.record.TXT;
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public class DnsResource extends LinkedTokenResource {
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final static Pattern magicPattern =
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Pattern.compile("openpgpid\\+token=([a-zA-Z0-9]+)(?:#|;)([a-zA-Z0-9]+)");
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String mFqdn;
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CLASS mClass;
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TYPE mType;
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DnsResource(Set<String> flags, HashMap<String, String> params, URI uri,
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String fqdn, CLASS clazz, TYPE type) {
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super(flags, params, uri);
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mFqdn = fqdn;
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mClass = clazz;
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mType = type;
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}
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public static String generateText(byte[] fingerprint) {
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return String.format("openpgp4fpr=%s",
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KeyFormattingUtils.convertFingerprintToHex(fingerprint));
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}
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public static DnsResource createNew (String domain) {
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HashSet<String> flags = new HashSet<>();
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HashMap<String,String> params = new HashMap<>();
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URI uri = URI.create("dns:" + domain + "?TYPE=TXT");
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return create(flags, params, uri);
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}
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public static DnsResource create(Set<String> flags, HashMap<String,String> params, URI uri) {
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if ( ! ("dns".equals(uri.getScheme())
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&& (flags == null || flags.isEmpty())
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&& (params == null || params.isEmpty()))) {
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return null;
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}
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//
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String spec = uri.getSchemeSpecificPart();
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// If there are // at the beginning, this includes an authority - we don't support those!
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if (spec.startsWith("//")) {
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return null;
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}
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String[] pieces = spec.split("\\?", 2);
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// In either case, part before a ? is the fqdn
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String fqdn = pieces[0];
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// There may be a query part
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/*
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if (pieces.length > 1) {
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// parse CLASS and TYPE query parameters
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}
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*/
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CLASS clazz = CLASS.IN;
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TYPE type = TYPE.TXT;
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return new DnsResource(flags, params, uri, fqdn, clazz, type);
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}
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@SuppressWarnings("unused")
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public String getFqdn() {
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return mFqdn;
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}
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@Override
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protected String fetchResource (Context context, OperationLog log, int indent) {
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Client c = new Client();
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DNSMessage msg = c.query(new Question(mFqdn, mType, mClass));
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Record aw = msg.getAnswers()[0];
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TXT txt = (TXT) aw.getPayload();
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return txt.getText().toLowerCase();
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}
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@Override
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protected Matcher matchResource(OperationLog log, int indent, String res) {
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return magicPattern.matcher(res);
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}
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@Override
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public @StringRes
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int getVerifiedText(boolean isSecret) {
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return isSecret ? R.string.linked_verified_secret_dns : R.string.linked_verified_dns;
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}
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@Override
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public @DrawableRes int getDisplayIcon() {
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return R.drawable.linked_dns;
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}
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@Override
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public String getDisplayTitle(Context context) {
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return context.getString(R.string.linked_title_dns);
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}
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@Override
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public String getDisplayComment(Context context) {
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return mFqdn;
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}
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}
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