354 lines
14 KiB
Java
354 lines
14 KiB
Java
/*
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* Copyright (C) 2012-2014 Dominik Schürmann <dominik@dominikschuermann.de>
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* Copyright (C) 2011 Thialfihar <thi@thialfihar.org>
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* Copyright (C) 2011 Senecaso
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.sufficientlysecure.keychain.util;
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import org.apache.http.HttpEntity;
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import org.apache.http.HttpResponse;
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import org.apache.http.HttpStatus;
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import org.apache.http.NameValuePair;
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import org.apache.http.client.HttpClient;
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import org.apache.http.client.entity.UrlEncodedFormEntity;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.client.methods.HttpPost;
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import org.apache.http.impl.client.DefaultHttpClient;
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import org.apache.http.message.BasicNameValuePair;
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import org.apache.http.util.EntityUtils;
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import org.sufficientlysecure.keychain.Constants;
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import org.sufficientlysecure.keychain.pgp.PgpHelper;
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import org.sufficientlysecure.keychain.ui.adapter.ImportKeysListEntry;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.UnsupportedEncodingException;
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import java.net.HttpURLConnection;
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import java.net.InetAddress;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLDecoder;
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import java.net.URLEncoder;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.GregorianCalendar;
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import java.util.List;
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import java.util.Locale;
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import java.util.TimeZone;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class HkpKeyServer extends KeyServer {
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private static class HttpError extends Exception {
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private static final long serialVersionUID = 1718783705229428893L;
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private int mCode;
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private String mData;
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public HttpError(int code, String data) {
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super("" + code + ": " + data);
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mCode = code;
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mData = data;
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}
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public int getCode() {
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return mCode;
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}
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public String getData() {
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return mData;
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}
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}
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private String mHost;
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private short mPort;
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/**
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* pub:%keyid%:%algo%:%keylen%:%creationdate%:%expirationdate%:%flags%
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* <ul>
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* <li>%<b>keyid</b>% = this is either the fingerprint or the key ID of the key.
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* Either the 16-digit or 8-digit key IDs are acceptable, but obviously the fingerprint is best.
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* </li>
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* <li>%<b>algo</b>% = the algorithm number, (i.e. 1==RSA, 17==DSA, etc).
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* See <a href="http://tools.ietf.org/html/rfc2440#section-9.1">RFC-2440</a></li>
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* <li>%<b>keylen</b>% = the key length (i.e. 1024, 2048, 4096, etc.)</li>
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* <li>%<b>creationdate</b>% = creation date of the key in standard
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* <a href="http://tools.ietf.org/html/rfc2440#section-9.1">RFC-2440</a> form (i.e. number of
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* seconds since 1/1/1970 UTC time)</li>
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* <li>%<b>expirationdate</b>% = expiration date of the key in standard
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* <a href="http://tools.ietf.org/html/rfc2440#section-9.1">RFC-2440</a> form (i.e. number of
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* seconds since 1/1/1970 UTC time)</li>
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* <li>%<b>flags</b>% = letter codes to indicate details of the key, if any. Flags may be in any
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* order. The meaning of "disabled" is implementation-specific. Note that individual flags may
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* be unimplemented, so the absence of a given flag does not necessarily mean the absence of the
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* detail.
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* <ul>
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* <li>r == revoked</li>
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* <li>d == disabled</li>
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* <li>e == expired</li>
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* </ul>
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* </li>
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* </ul>
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*
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* @see <a href="http://tools.ietf.org/html/draft-shaw-openpgp-hkp-00#section-5.2">
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* 5.2. Machine Readable Indexes</a>
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* in Internet-Draft OpenPGP HTTP Keyserver Protocol Document
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*/
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public static final Pattern PUB_KEY_LINE = Pattern
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.compile("pub:([0-9a-fA-F]+):([0-9]+):([0-9]+):([0-9]+):([0-9]*):([rde]*)[ \n\r]*" // pub line
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+ "(uid:(.*):([0-9]+):([0-9]*):([rde]*))+", // one or more uid lines
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Pattern.CASE_INSENSITIVE);
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/**
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* uid:%escaped uid string%:%creationdate%:%expirationdate%:%flags%
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* <ul>
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* <li>%<b>escaped uid string</b>% = the user ID string, with HTTP %-escaping for anything that
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* isn't 7-bit safe as well as for the ":" character. Any other characters may be escaped, as
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* desired.</li>
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* <li>%<b>creationdate</b>% = creation date of the key in standard
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* <a href="http://tools.ietf.org/html/rfc2440#section-9.1">RFC-2440</a> form (i.e. number of
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* seconds since 1/1/1970 UTC time)</li>
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* <li>%<b>expirationdate</b>% = expiration date of the key in standard
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* <a href="http://tools.ietf.org/html/rfc2440#section-9.1">RFC-2440</a> form (i.e. number of
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* seconds since 1/1/1970 UTC time)</li>
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* <li>%<b>flags</b>% = letter codes to indicate details of the key, if any. Flags may be in any
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* order. The meaning of "disabled" is implementation-specific. Note that individual flags may
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* be unimplemented, so the absence of a given flag does not necessarily mean the absence of
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* the detail.
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* <ul>
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* <li>r == revoked</li>
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* <li>d == disabled</li>
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* <li>e == expired</li>
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* </ul>
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* </li>
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* </ul>
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*/
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public static final Pattern UID_LINE = Pattern
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.compile("uid:(.*):([0-9]+):([0-9]*):([rde]*)",
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Pattern.CASE_INSENSITIVE);
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private static final short PORT_DEFAULT = 11371;
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/**
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* @param hostAndPort may be just
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* "<code>hostname</code>" (eg. "<code>pool.sks-keyservers.net</code>"), then it will
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* connect using {@link #PORT_DEFAULT}. However, port may be specified after colon
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* ("<code>hostname:port</code>", eg. "<code>p80.pool.sks-keyservers.net:80</code>").
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*/
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public HkpKeyServer(String hostAndPort) {
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String host = hostAndPort;
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short port = PORT_DEFAULT;
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final int colonPosition = hostAndPort.lastIndexOf(':');
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if (colonPosition > 0) {
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host = hostAndPort.substring(0, colonPosition);
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final String portStr = hostAndPort.substring(colonPosition + 1);
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port = Short.decode(portStr);
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}
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mHost = host;
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mPort = port;
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}
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public HkpKeyServer(String host, short port) {
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mHost = host;
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mPort = port;
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}
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private static String readAll(InputStream in, String encoding) throws IOException {
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ByteArrayOutputStream raw = new ByteArrayOutputStream();
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byte buffer[] = new byte[1 << 16];
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int n = 0;
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while ((n = in.read(buffer)) != -1) {
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raw.write(buffer, 0, n);
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}
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if (encoding == null) {
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encoding = "utf8";
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}
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return raw.toString(encoding);
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}
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private String query(String request) throws QueryException, HttpError {
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InetAddress ips[];
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try {
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ips = InetAddress.getAllByName(mHost);
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} catch (UnknownHostException e) {
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throw new QueryException(e.toString());
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}
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for (int i = 0; i < ips.length; ++i) {
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try {
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String url = "http://" + ips[i].getHostAddress() + ":" + mPort + request;
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Log.d(Constants.TAG, "hkp keyserver query: " + url);
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URL realUrl = new URL(url);
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HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
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conn.setConnectTimeout(5000);
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conn.setReadTimeout(25000);
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conn.connect();
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int response = conn.getResponseCode();
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if (response >= 200 && response < 300) {
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return readAll(conn.getInputStream(), conn.getContentEncoding());
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} else {
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String data = readAll(conn.getErrorStream(), conn.getContentEncoding());
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throw new HttpError(response, data);
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}
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} catch (MalformedURLException e) {
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// nothing to do, try next IP
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} catch (IOException e) {
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// nothing to do, try next IP
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}
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}
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throw new QueryException("querying server(s) for '" + mHost + "' failed");
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}
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@Override
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public ArrayList<ImportKeysListEntry> search(String query) throws QueryException, TooManyResponses,
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InsufficientQuery {
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ArrayList<ImportKeysListEntry> results = new ArrayList<ImportKeysListEntry>();
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if (query.length() < 3) {
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throw new InsufficientQuery();
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}
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String encodedQuery;
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try {
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encodedQuery = URLEncoder.encode(query, "utf8");
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} catch (UnsupportedEncodingException e) {
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return null;
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}
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String request = "/pks/lookup?op=index&options=mr&search=" + encodedQuery;
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String data;
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try {
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data = query(request);
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} catch (HttpError e) {
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if (e.getCode() == 404) {
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return results;
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} else {
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if (e.getData().toLowerCase(Locale.US).contains("no keys found")) {
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return results;
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} else if (e.getData().toLowerCase(Locale.US).contains("too many")) {
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throw new TooManyResponses();
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} else if (e.getData().toLowerCase(Locale.US).contains("insufficient")) {
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throw new InsufficientQuery();
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}
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}
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throw new QueryException("querying server(s) for '" + mHost + "' failed");
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}
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final Matcher matcher = PUB_KEY_LINE.matcher(data);
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while (matcher.find()) {
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final ImportKeysListEntry entry = new ImportKeysListEntry();
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entry.setBitStrength(Integer.parseInt(matcher.group(3)));
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final int algorithmId = Integer.decode(matcher.group(2));
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entry.setAlgorithm(ImportKeysListEntry.getAlgorithmFromId(algorithmId));
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// group 1 contains the full fingerprint (v4) or the long key id if available
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// see http://bit.ly/1d4bxbk and http://bit.ly/1gD1wwr
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String fingerprintOrKeyId = matcher.group(1);
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if (fingerprintOrKeyId.length() > 16) {
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entry.setFingerPrintHex(fingerprintOrKeyId.toLowerCase(Locale.US));
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entry.setKeyIdHex("0x" + fingerprintOrKeyId.substring(fingerprintOrKeyId.length()
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- 16, fingerprintOrKeyId.length()));
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} else {
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// set key id only
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entry.setKeyIdHex("0x" + fingerprintOrKeyId);
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}
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final long creationDate = Long.parseLong(matcher.group(4));
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final GregorianCalendar tmpGreg = new GregorianCalendar(TimeZone.getTimeZone("UTC"));
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tmpGreg.setTimeInMillis(creationDate * 1000);
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entry.setDate(tmpGreg.getTime());
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entry.setRevoked(matcher.group(6).contains("r"));
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ArrayList<String> userIds = new ArrayList<String>();
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final String uidLines = matcher.group(7);
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final Matcher uidMatcher = UID_LINE.matcher(uidLines);
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while (uidMatcher.find()) {
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String tmp = uidMatcher.group(1).trim();
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if (tmp.contains("%")) {
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try {
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// converts Strings like "Universit%C3%A4t" to a proper encoding form "Universität".
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tmp = (URLDecoder.decode(tmp, "UTF8"));
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} catch (UnsupportedEncodingException ignored) {
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// will never happen, because "UTF8" is supported
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}
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}
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userIds.add(tmp);
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}
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entry.setUserIds(userIds);
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results.add(entry);
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}
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return results;
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}
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@Override
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public String get(String keyIdHex) throws QueryException {
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HttpClient client = new DefaultHttpClient();
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try {
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String query = "http://" + mHost + ":" + mPort +
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"/pks/lookup?op=get&options=mr&search=" + keyIdHex;
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Log.d(Constants.TAG, "hkp keyserver get: " + query);
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HttpGet get = new HttpGet(query);
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HttpResponse response = client.execute(get);
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if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
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throw new QueryException("not found");
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}
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HttpEntity entity = response.getEntity();
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InputStream is = entity.getContent();
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String data = readAll(is, EntityUtils.getContentCharSet(entity));
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Matcher matcher = PgpHelper.PGP_PUBLIC_KEY.matcher(data);
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if (matcher.find()) {
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return matcher.group(1);
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}
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} catch (IOException e) {
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// nothing to do, better luck on the next keyserver
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} finally {
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client.getConnectionManager().shutdown();
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}
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return null;
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}
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@Override
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public void add(String armoredKey) throws AddKeyException {
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HttpClient client = new DefaultHttpClient();
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try {
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String query = "http://" + mHost + ":" + mPort + "/pks/add";
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HttpPost post = new HttpPost(query);
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Log.d(Constants.TAG, "hkp keyserver add: " + query);
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List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
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nameValuePairs.add(new BasicNameValuePair("keytext", armoredKey));
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post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
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HttpResponse response = client.execute(post);
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if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
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throw new AddKeyException();
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}
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} catch (IOException e) {
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// nothing to do, better luck on the next keyserver
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} finally {
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client.getConnectionManager().shutdown();
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}
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}
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}
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