mirror of https://github.com/M66B/FairEmail.git
672 lines
27 KiB
Java
672 lines
27 KiB
Java
package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail 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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FairEmail 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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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2019 by Marcel Bokhorst (M66B)
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*/
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import android.content.Context;
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import android.content.res.XmlResourceParser;
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import android.text.TextUtils;
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import androidx.annotation.NonNull;
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import org.xbill.DNS.Lookup;
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import org.xbill.DNS.MXRecord;
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import org.xbill.DNS.Record;
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import org.xbill.DNS.SRVRecord;
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import org.xbill.DNS.SimpleResolver;
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import org.xbill.DNS.TextParseException;
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import org.xbill.DNS.Type;
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import org.xmlpull.v1.XmlPullParser;
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import org.xmlpull.v1.XmlPullParserException;
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import org.xmlpull.v1.XmlPullParserFactory;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.net.HttpURLConnection;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import java.net.URL;
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import java.net.UnknownHostException;
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import java.text.Collator;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Locale;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Future;
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public class EmailProvider {
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public String name;
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public List<String> domain;
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public int order;
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public String type;
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public int keepalive;
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public boolean partial;
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public boolean useip;
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public String link;
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public Server imap = new Server();
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public Server smtp = new Server();
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public OAuth oauth;
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public UserType user = UserType.EMAIL;
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public StringBuilder documentation; // html
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enum Discover {ALL, IMAP, SMTP}
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enum UserType {LOCAL, EMAIL}
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private static final int SCAN_TIMEOUT = 5 * 1000; // milliseconds
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private static final int ISPDB_TIMEOUT = 15 * 1000; // milliseconds
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private static final ExecutorService executor =
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Helper.getBackgroundExecutor(0, "provider");
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private EmailProvider() {
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}
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EmailProvider(String name) {
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this.name = name;
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}
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private void validate() throws UnknownHostException {
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if (TextUtils.isEmpty(this.imap.host) || this.imap.port <= 0 ||
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TextUtils.isEmpty(this.smtp.host) || this.smtp.port <= 0)
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throw new UnknownHostException(this.name + " invalid");
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}
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static List<EmailProvider> loadProfiles(Context context) {
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List<EmailProvider> result = null;
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try {
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EmailProvider provider = null;
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XmlResourceParser xml = context.getResources().getXml(R.xml.providers);
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int eventType = xml.getEventType();
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while (eventType != XmlPullParser.END_DOCUMENT) {
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if (eventType == XmlPullParser.START_TAG) {
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String name = xml.getName();
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if ("providers".equals(name))
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result = new ArrayList<>();
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else if ("provider".equals(name)) {
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provider = new EmailProvider();
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provider.name = xml.getAttributeValue(null, "name");
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String domain = xml.getAttributeValue(null, "domain");
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if (domain != null)
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provider.domain = Arrays.asList(domain.split(","));
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provider.order = xml.getAttributeIntValue(null, "order", Integer.MAX_VALUE);
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provider.keepalive = xml.getAttributeIntValue(null, "keepalive", 0);
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provider.partial = xml.getAttributeBooleanValue(null, "partial", true);
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provider.useip = xml.getAttributeBooleanValue(null, "useip", true);
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provider.link = xml.getAttributeValue(null, "link");
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provider.type = xml.getAttributeValue(null, "type");
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String user = xml.getAttributeValue(null, "user");
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if ("local".equals(user))
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provider.user = UserType.LOCAL;
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else if ("email".equals(user))
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provider.user = UserType.EMAIL;
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} else if ("imap".equals(name)) {
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provider.imap.host = xml.getAttributeValue(null, "host");
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provider.imap.port = xml.getAttributeIntValue(null, "port", 0);
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provider.imap.starttls = xml.getAttributeBooleanValue(null, "starttls", false);
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} else if ("smtp".equals(name)) {
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provider.smtp.host = xml.getAttributeValue(null, "host");
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provider.smtp.port = xml.getAttributeIntValue(null, "port", 0);
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provider.smtp.starttls = xml.getAttributeBooleanValue(null, "starttls", false);
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} else if ("oauth".equals(name)) {
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provider.oauth = new OAuth();
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provider.oauth.clientId = xml.getAttributeValue(null, "clientId");
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provider.oauth.clientSecret = xml.getAttributeValue(null, "clientSecret");
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provider.oauth.scopes = xml.getAttributeValue(null, "scopes").split(",");
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provider.oauth.authorizationEndpoint = xml.getAttributeValue(null, "authorizationEndpoint");
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provider.oauth.tokenEndpoint = xml.getAttributeValue(null, "tokenEndpoint");
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provider.oauth.redirectUri = xml.getAttributeValue(null, "redirectUri");
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} else
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throw new IllegalAccessException(name);
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} else if (eventType == XmlPullParser.END_TAG) {
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if ("provider".equals(xml.getName())) {
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result.add(provider);
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provider = null;
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}
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}
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eventType = xml.next();
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}
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} catch (Throwable ex) {
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Log.e(ex);
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}
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final Collator collator = Collator.getInstance(Locale.getDefault());
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collator.setStrength(Collator.SECONDARY); // Case insensitive, process accents etc
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Collections.sort(result, new Comparator<EmailProvider>() {
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@Override
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public int compare(EmailProvider p1, EmailProvider p2) {
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int o = Integer.compare(p1.order, p2.order);
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if (o == 0)
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return collator.compare(p1.name, p2.name);
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else
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return o;
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}
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});
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return result;
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}
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@NonNull
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static EmailProvider fromDomain(Context context, String domain, Discover discover) throws IOException {
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return fromEmail(context, domain, discover);
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}
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@NonNull
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static EmailProvider fromEmail(Context context, String email, Discover discover) throws IOException {
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int at = email.indexOf("@");
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String domain = (at < 0 ? email : email.substring(at + 1));
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if (at < 0)
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email = "someone@" + domain;
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List<EmailProvider> providers = loadProfiles(context);
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for (EmailProvider provider : providers)
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if (provider.domain != null)
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for (String d : provider.domain)
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if (domain.toLowerCase(Locale.ROOT).matches(d)) {
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Log.i("Provider from domain=" + domain + " (" + d + ")");
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return provider;
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}
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EmailProvider autoconfig = _fromDomain(context, domain.toLowerCase(Locale.ROOT), email, discover);
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// Always prefer built-in profiles
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// - ISPDB is not always correct
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// - documentation links
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for (EmailProvider provider : providers)
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if (provider.imap.host.equals(autoconfig.imap.host) ||
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provider.smtp.host.equals(autoconfig.smtp.host)) {
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Log.i("Replacing auto config by profile=" + provider.name);
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return provider;
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}
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// https://docs.aws.amazon.com/workmail/latest/userguide/using_IMAP_client.html
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if (autoconfig.imap.host != null &&
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autoconfig.imap.host.endsWith(".awsapps.com"))
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autoconfig.partial = false;
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return autoconfig;
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}
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@NonNull
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private static EmailProvider _fromDomain(Context context, String domain, String email, Discover discover) throws IOException {
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try {
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// Assume the provider knows best
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Log.i("Provider from DNS domain=" + domain);
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return fromDNS(context, domain, discover);
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} catch (Throwable ex) {
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Log.w(ex);
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try {
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// Check ISPDB
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Log.i("Provider from ISPDB domain=" + domain);
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return fromISPDB(context, domain, email);
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} catch (Throwable ex1) {
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Log.w(ex1);
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try {
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// Scan ports
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Log.i("Provider from template domain=" + domain);
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return fromTemplate(context, domain, discover);
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} catch (Throwable ex2) {
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Log.w(ex2);
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throw new UnknownHostException(context.getString(R.string.title_setup_no_settings, domain));
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}
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}
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}
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}
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@NonNull
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private static EmailProvider fromISPDB(Context context, String domain, String email) throws IOException, XmlPullParserException {
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try {
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return _fromISPDB(context, domain, email);
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} catch (Throwable ex) {
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Log.w(ex);
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Record[] records = lookupDNS(context, domain, Type.MX);
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for (Record record : records) {
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String target = ((MXRecord) record).getTarget().toString(true);
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while (target != null && target.indexOf('.') > 0) {
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try {
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return _fromISPDB(context, target, email);
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} catch (Throwable ex1) {
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Log.w(ex1);
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int dot = target.indexOf('.');
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target = target.substring(dot + 1);
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}
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}
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}
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throw new UnknownHostException(domain);
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}
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}
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@NonNull
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private static EmailProvider _fromISPDB(Context context, String domain, String email) throws IOException, XmlPullParserException {
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// https://wiki.mozilla.org/Thunderbird:Autoconfiguration
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try {
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URL url = new URL("https://autoconfig." + domain + "/mail/config-v1.1.xml?emailaddress=" + email);
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return getISPDB(domain, url);
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} catch (Throwable ex) {
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Log.w(ex);
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}
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try {
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URL url = new URL("https://" + domain + "/.well-known/autoconfig/mail/config-v1.1.xml?emailaddress=" + email);
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return getISPDB(domain, url);
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} catch (Throwable ex) {
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Log.w(ex);
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}
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URL url = new URL("https://autoconfig.thunderbird.net/v1.1/" + domain);
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return getISPDB(domain, url);
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}
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@NonNull
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private static EmailProvider getISPDB(String domain, URL url) throws IOException, XmlPullParserException {
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EmailProvider provider = new EmailProvider(domain);
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HttpURLConnection request = null;
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try {
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Log.i("Fetching " + url);
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request = (HttpURLConnection) url.openConnection();
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request.setReadTimeout(ISPDB_TIMEOUT);
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request.setConnectTimeout(ISPDB_TIMEOUT);
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request.setRequestMethod("GET");
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request.setDoInput(true);
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request.connect();
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// https://developer.android.com/reference/org/xmlpull/v1/XmlPullParser
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XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
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XmlPullParser xml = factory.newPullParser();
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xml.setInput(new InputStreamReader(request.getInputStream()));
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boolean imap = false;
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boolean smtp = false;
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String href = null;
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String title = null;
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int eventType = xml.getEventType();
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while (eventType != XmlPullParser.END_DOCUMENT) {
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if (eventType == XmlPullParser.START_TAG) {
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String name = xml.getName();
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if ("displayShortName".equals(name)) {
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// <displayShortName>GMail</displayShortName>
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String display = xml.getText();
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Log.i("Name=" + display);
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provider.name = display;
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}
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continue;
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} else if ("incomingServer".equals(name)) {
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// <incomingServer type="imap">
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// <hostname>imap.gmail.com</hostname>
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// <port>993</port>
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// <socketType>SSL</socketType>
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// <username>%EMAILADDRESS%</username>
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// <authentication>OAuth2</authentication>
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// <authentication>password-cleartext</authentication>
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// </incomingServer>
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imap = "imap".equals(xml.getAttributeValue(null, "type"));
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} else if ("outgoingServer".equals(name)) {
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// <outgoingServer type="smtp">
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// <hostname>smtp.gmail.com</hostname>
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// <port>465</port>
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// <socketType>SSL</socketType>
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// <username>%EMAILADDRESS%</username>
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// <authentication>OAuth2</authentication>
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// <authentication>password-cleartext</authentication>
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// </outgoingServer>
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smtp = "smtp".equals(xml.getAttributeValue(null, "type"));
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} else if ("hostname".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String host = xml.getText();
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Log.i("Host=" + host);
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if (imap)
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provider.imap.host = host;
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else if (smtp)
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provider.smtp.host = host;
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}
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continue;
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} else if ("port".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String port = xml.getText();
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Log.i("Port=" + port);
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if (imap) {
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provider.imap.port = Integer.parseInt(port);
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provider.imap.starttls = (provider.imap.port == 143);
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} else if (smtp) {
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provider.smtp.port = Integer.parseInt(port);
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provider.smtp.starttls = (provider.smtp.port == 587);
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}
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}
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continue;
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} else if ("socketType".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String socket = xml.getText();
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Log.i("Socket=" + socket);
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if ("SSL".equals(socket)) {
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if (imap)
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provider.imap.starttls = false;
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else if (smtp)
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provider.smtp.starttls = false;
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} else if ("STARTTLS".equals(socket)) {
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if (imap)
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provider.imap.starttls = true;
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else if (smtp)
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provider.smtp.starttls = true;
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} else
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Log.w("Unknown socket type=" + socket);
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}
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continue;
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} else if ("username".equals(name)) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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String username = xml.getText();
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Log.i("Username=" + username);
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if ("%EMAILADDRESS%".equals(username))
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provider.user = UserType.EMAIL;
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else if ("%EMAILLOCALPART%".equals(username))
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provider.user = UserType.LOCAL;
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else
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Log.w("Unknown username type=" + username);
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}
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continue;
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} else if ("enable".equals(name)) {
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// <enable visiturl="https://mail.google.com/mail/?ui=2&shva=1#settings/fwdandpop">
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// <instruction>You need to enable IMAP access</instruction>
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// </enable>
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href = xml.getAttributeValue(null, "visiturl");
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title = null;
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} else if ("documentation".equals(name)) {
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// <documentation url="http://mail.google.com/support/bin/answer.py?answer=13273">
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// <descr>How to enable IMAP/POP3 in GMail</descr>
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// </documentation>
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href = xml.getAttributeValue(null, "url");
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title = null;
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} else if ("instruction".equals(name) || "descr".equals(name)) {
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if (href != null) {
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eventType = xml.next();
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if (eventType == XmlPullParser.TEXT) {
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if (title == null)
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title = "";
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else
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title += "<br>";
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title += xml.getText();
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}
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continue;
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}
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}
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} else if (eventType == XmlPullParser.END_TAG) {
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String name = xml.getName();
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if ("incomingServer".equals(name))
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imap = false;
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else if ("outgoingServer".equals(name))
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smtp = false;
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else if ("enable".equals(name) || "documentation".equals(name)) {
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if (href != null) {
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if (title == null)
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title = href;
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addDocumentation(provider, href, title);
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href = null;
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title = null;
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}
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}
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}
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eventType = xml.next();
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}
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Log.i("imap=" + provider.imap.host + ":" + provider.imap.port + ":" + provider.imap.starttls);
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Log.i("smtp=" + provider.smtp.host + ":" + provider.smtp.port + ":" + provider.smtp.starttls);
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provider.validate();
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return provider;
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} finally {
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if (request != null)
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request.disconnect();
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}
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}
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@NonNull
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private static EmailProvider fromDNS(Context context, String domain, Discover discover) throws TextParseException, UnknownHostException {
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// https://tools.ietf.org/html/rfc6186
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EmailProvider provider = new EmailProvider(domain);
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if (discover == Discover.ALL || discover == Discover.IMAP) {
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try {
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// Identifies an IMAP server where TLS is initiated directly upon connection to the IMAP server.
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Record[] records = lookupDNS(context, "_imaps._tcp." + domain, Type.SRV);
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// ... service is not supported at all at a particular domain by setting the target of an SRV RR to "."
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SRVRecord srv = (SRVRecord) records[0];
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provider.imap.host = srv.getTarget().toString(true);
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provider.imap.port = srv.getPort();
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provider.imap.starttls = false;
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} catch (UnknownHostException ex) {
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// Identifies an IMAP server that MAY ... require the MUA to use the "STARTTLS" command
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Record[] records = lookupDNS(context, "_imap._tcp." + domain, Type.SRV);
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SRVRecord srv = (SRVRecord) records[0];
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provider.imap.host = srv.getTarget().toString(true);
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provider.imap.port = srv.getPort();
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provider.imap.starttls = (provider.imap.port == 143);
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}
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}
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if (discover == Discover.ALL || discover == Discover.SMTP) {
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// Note that this covers connections both with and without Transport Layer Security (TLS)
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Record[] records = lookupDNS(context, "_submission._tcp." + domain, Type.SRV);
|
|
SRVRecord srv = (SRVRecord) records[0];
|
|
provider.smtp.host = srv.getTarget().toString(true);
|
|
provider.smtp.port = srv.getPort();
|
|
provider.smtp.starttls = (provider.smtp.port == 587);
|
|
}
|
|
|
|
provider.validate();
|
|
|
|
return provider;
|
|
}
|
|
|
|
@NonNull
|
|
private static EmailProvider fromTemplate(Context context, String domain, Discover discover)
|
|
throws ExecutionException, InterruptedException, UnknownHostException {
|
|
Server imap = null;
|
|
Server smtp = null;
|
|
|
|
if (discover == Discover.ALL || discover == Discover.IMAP) {
|
|
List<Server> imaps = new ArrayList<>();
|
|
// SSL
|
|
imaps.add(new Server(domain, null, 993));
|
|
imaps.add(new Server(domain, "imap", 993));
|
|
imaps.add(new Server(domain, "mail", 993));
|
|
imaps.add(new Server(domain, "mx", 993));
|
|
// STARTTLS
|
|
imaps.add(new Server(domain, null, 143));
|
|
imaps.add(new Server(domain, "imap", 143));
|
|
imaps.add(new Server(domain, "mail", 143));
|
|
imaps.add(new Server(domain, "mx", 143));
|
|
|
|
for (Server server : imaps)
|
|
if (server.reachable.get()) {
|
|
imap = server;
|
|
break;
|
|
}
|
|
|
|
if (imap == null)
|
|
throw new UnknownHostException(domain + " template");
|
|
}
|
|
|
|
if (discover == Discover.ALL || discover == Discover.SMTP) {
|
|
List<Server> smtps = new ArrayList<>();
|
|
// SSL
|
|
smtps.add(new Server(domain, null, 465));
|
|
smtps.add(new Server(domain, "smtp", 465));
|
|
smtps.add(new Server(domain, "mail", 465));
|
|
smtps.add(new Server(domain, "mx", 465));
|
|
// STARTTLS
|
|
smtps.add(new Server(domain, null, 587));
|
|
smtps.add(new Server(domain, "smtp", 587));
|
|
smtps.add(new Server(domain, "mail", 587));
|
|
smtps.add(new Server(domain, "mx", 587));
|
|
|
|
for (Server server : smtps)
|
|
if (server.reachable.get()) {
|
|
smtp = server;
|
|
break;
|
|
}
|
|
|
|
if (smtp == null)
|
|
throw new UnknownHostException(domain + " template");
|
|
}
|
|
|
|
|
|
EmailProvider provider = new EmailProvider();
|
|
provider.name = domain;
|
|
|
|
if (imap != null) {
|
|
provider.imap.host = imap.host;
|
|
provider.imap.port = imap.port;
|
|
provider.imap.starttls = (imap.port == 143);
|
|
}
|
|
|
|
if (smtp != null) {
|
|
provider.smtp.host = smtp.host;
|
|
provider.smtp.port = smtp.port;
|
|
provider.smtp.starttls = (smtp.port == 587);
|
|
}
|
|
|
|
return provider;
|
|
}
|
|
|
|
private static void addDocumentation(EmailProvider provider, String href, String title) {
|
|
if (provider.documentation == null)
|
|
provider.documentation = new StringBuilder();
|
|
else
|
|
provider.documentation.append("<br><br>");
|
|
|
|
provider.documentation.append("<a href=\"").append(href).append("\">").append(title).append("</a>");
|
|
}
|
|
|
|
@NonNull
|
|
private static Record[] lookupDNS(Context context, String name, int type) throws TextParseException, UnknownHostException {
|
|
Lookup lookup = new Lookup(name, type);
|
|
|
|
SimpleResolver resolver = new SimpleResolver(ConnectionHelper.getDnsServer(context));
|
|
lookup.setResolver(resolver);
|
|
Log.i("Lookup name=" + name + " @" + resolver.getAddress() + " type=" + type);
|
|
Record[] records = lookup.run();
|
|
|
|
if (lookup.getResult() != Lookup.SUCCESSFUL)
|
|
if (lookup.getResult() == Lookup.HOST_NOT_FOUND ||
|
|
lookup.getResult() == Lookup.TYPE_NOT_FOUND)
|
|
throw new UnknownHostException(name);
|
|
else
|
|
throw new UnknownHostException(lookup.getErrorString());
|
|
|
|
if (records.length == 0)
|
|
throw new UnknownHostException(name);
|
|
|
|
for (Record record : records)
|
|
Log.i("Found record=" + record);
|
|
|
|
return records;
|
|
}
|
|
|
|
@NonNull
|
|
@Override
|
|
public String toString() {
|
|
return name;
|
|
}
|
|
|
|
public static class Server {
|
|
public String host;
|
|
public int port;
|
|
public boolean starttls;
|
|
|
|
private Future<Boolean> reachable;
|
|
|
|
private Server() {
|
|
}
|
|
|
|
private Server(String domain, String prefix, int port) {
|
|
this.host = (prefix == null ? "" : prefix + ".") + domain;
|
|
this.port = port;
|
|
|
|
Log.i("Scanning " + host + ":" + port);
|
|
this.reachable = executor.submit(new Callable<Boolean>() {
|
|
@Override
|
|
public Boolean call() {
|
|
try {
|
|
for (InetAddress iaddr : InetAddress.getAllByName(host)) {
|
|
InetSocketAddress address = new InetSocketAddress(iaddr, Server.this.port);
|
|
try (Socket socket = new Socket()) {
|
|
Log.i("Connecting to " + address);
|
|
socket.connect(address, SCAN_TIMEOUT);
|
|
Log.i("Reachable " + address);
|
|
return true;
|
|
} catch (Throwable ex) {
|
|
Log.i("Unreachable " + address + ": " + Log.formatThrowable(ex));
|
|
}
|
|
}
|
|
return false;
|
|
} catch (Throwable ex) {
|
|
Log.w(ex);
|
|
return false;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
@NonNull
|
|
@Override
|
|
public String toString() {
|
|
return host + ":" + port;
|
|
}
|
|
}
|
|
|
|
public static class OAuth {
|
|
String clientId;
|
|
String clientSecret;
|
|
String[] scopes;
|
|
String authorizationEndpoint;
|
|
String tokenEndpoint;
|
|
String redirectUri;
|
|
}
|
|
}
|