mirror of https://github.com/moparisthebest/k-9
653 lines
27 KiB
Java
653 lines
27 KiB
Java
package com.fsck.k9.mail.store.imap;
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import android.net.ConnectivityManager;
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import android.net.NetworkInfo;
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import android.util.Log;
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import com.fsck.k9.mail.Authentication;
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import com.fsck.k9.mail.AuthenticationFailedException;
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import com.fsck.k9.mail.CertificateValidationException;
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import com.fsck.k9.mail.ConnectionSecurity;
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import com.fsck.k9.mail.K9MailLib;
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import com.fsck.k9.mail.MessagingException;
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import com.fsck.k9.mail.filter.Base64;
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import com.fsck.k9.mail.filter.PeekableInputStream;
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import com.fsck.k9.mail.ssl.TrustedSocketFactory;
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import com.fsck.k9.mail.store.RemoteStore;
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import com.fsck.k9.mail.transport.imap.ImapSettings;
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import com.jcraft.jzlib.JZlib;
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import com.jcraft.jzlib.ZOutputStream;
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import org.apache.commons.io.IOUtils;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.ConnectException;
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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.SocketAddress;
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import java.net.SocketException;
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import java.security.GeneralSecurityException;
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import java.security.Security;
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import java.security.cert.CertificateException;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Locale;
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import java.util.Set;
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import java.util.regex.Pattern;
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import java.util.zip.Inflater;
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import java.util.zip.InflaterInputStream;
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import javax.net.ssl.SSLException;
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import static com.fsck.k9.mail.K9MailLib.DEBUG_PROTOCOL_IMAP;
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import static com.fsck.k9.mail.K9MailLib.LOG_TAG;
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/**
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* A cacheable class that stores the details for a single IMAP connection.
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*/
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class ImapConnection {
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private Socket mSocket;
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private PeekableInputStream mIn;
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private OutputStream mOut;
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private ImapResponseParser mParser;
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private int mNextCommandTag;
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private Set<String> capabilities = new HashSet<String>();
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private ImapSettings mSettings;
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private ConnectivityManager mConnectivityManager;
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private final TrustedSocketFactory mSocketFactory;
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public ImapConnection(ImapSettings settings,
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TrustedSocketFactory socketFactory,
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ConnectivityManager connectivityManager) {
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this.mSettings = settings;
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this.mSocketFactory = socketFactory;
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this.mConnectivityManager = connectivityManager;
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}
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public Set<String> getCapabilities() {
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return capabilities;
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}
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public OutputStream getOutputStream() {
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return mOut;
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}
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protected String getLogId() {
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return "conn" + hashCode();
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}
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private List<ImapResponse> receiveCapabilities(List<ImapResponse> responses) {
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for (ImapResponse response : responses) {
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ImapList capabilityList = null;
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if (!response.isEmpty() && ImapResponseParser.equalsIgnoreCase(response.get(0), "OK")) {
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for (Object thisPart : response) {
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if (thisPart instanceof ImapList) {
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ImapList thisList = (ImapList)thisPart;
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if (ImapResponseParser.equalsIgnoreCase(thisList.get(0), ImapCommands.CAPABILITY_CAPABILITY)) {
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capabilityList = thisList;
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break;
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}
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}
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}
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} else if (response.mTag == null) {
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capabilityList = response;
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}
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if (capabilityList != null && !capabilityList.isEmpty() &&
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ImapResponseParser.equalsIgnoreCase(capabilityList.get(0), ImapCommands.CAPABILITY_CAPABILITY)) {
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if (K9MailLib.isDebug()) {
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Log.d(LOG_TAG, "Saving " + capabilityList.size() + " capabilities for " + getLogId());
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}
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for (Object capability : capabilityList) {
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if (capability instanceof String) {
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// if (K9MailLib.isDebug())
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// {
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// Log.v(LOG_TAG, "Saving capability '" + capability + "' for " + getLogId());
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// }
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capabilities.add(((String)capability).toUpperCase(Locale.US));
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}
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}
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}
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}
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return responses;
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}
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public void open() throws IOException, MessagingException {
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if (isOpen()) {
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return;
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}
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boolean authSuccess = false;
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mNextCommandTag = 1;
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try {
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Security.setProperty("networkaddress.cache.ttl", "0");
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} catch (Exception e) {
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Log.w(LOG_TAG, "Could not set DNS ttl to 0 for " + getLogId(), e);
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}
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try {
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Security.setProperty("networkaddress.cache.negative.ttl", "0");
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} catch (Exception e) {
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Log.w(LOG_TAG, "Could not set DNS negative ttl to 0 for " + getLogId(), e);
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}
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try {
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ConnectionSecurity connectionSecurity = mSettings.getConnectionSecurity();
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// Try all IPv4 and IPv6 addresses of the host
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InetAddress[] addresses = InetAddress.getAllByName(mSettings.getHost());
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for (int i = 0; i < addresses.length; i++) {
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try {
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if (K9MailLib.isDebug() && DEBUG_PROTOCOL_IMAP) {
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Log.d(LOG_TAG, "Connecting to " + mSettings.getHost() + " as " +
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addresses[i]);
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}
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SocketAddress socketAddress = new InetSocketAddress(addresses[i],
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mSettings.getPort());
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if (connectionSecurity == ConnectionSecurity.SSL_TLS_REQUIRED) {
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mSocket = mSocketFactory.createSocket(
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null,
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mSettings.getHost(),
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mSettings.getPort(),
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mSettings.getClientCertificateAlias());
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} else {
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mSocket = new Socket();
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}
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mSocket.connect(socketAddress, RemoteStore.SOCKET_CONNECT_TIMEOUT);
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// Successfully connected to the server; don't try any other addresses
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break;
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} catch (SocketException e) {
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if (i < (addresses.length - 1)) {
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// There are still other addresses for that host to try
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continue;
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}
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throw new MessagingException("Cannot connect to host", e);
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}
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}
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setReadTimeout(RemoteStore.SOCKET_READ_TIMEOUT);
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mIn = new PeekableInputStream(new BufferedInputStream(mSocket.getInputStream(),
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1024));
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mParser = new ImapResponseParser(mIn);
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mOut = new BufferedOutputStream(mSocket.getOutputStream(), 1024);
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capabilities.clear();
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ImapResponse nullResponse = mParser.readResponse();
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if (K9MailLib.isDebug() && DEBUG_PROTOCOL_IMAP)
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Log.v(LOG_TAG, getLogId() + "<<<" + nullResponse);
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List<ImapResponse> nullResponses = new LinkedList<ImapResponse>();
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nullResponses.add(nullResponse);
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receiveCapabilities(nullResponses);
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if (!hasCapability(ImapCommands.CAPABILITY_CAPABILITY)) {
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if (K9MailLib.isDebug())
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Log.i(LOG_TAG, "Did not get capabilities in banner, requesting CAPABILITY for " + getLogId());
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List<ImapResponse> responses = receiveCapabilities(executeSimpleCommand(ImapCommands.COMMAND_CAPABILITY));
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if (responses.size() != 2) {
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throw new MessagingException("Invalid CAPABILITY response received");
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}
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}
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if (mSettings.getConnectionSecurity() == ConnectionSecurity.STARTTLS_REQUIRED) {
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if (hasCapability("STARTTLS")) {
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// STARTTLS
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executeSimpleCommand("STARTTLS");
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mSocket = mSocketFactory.createSocket(
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mSocket,
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mSettings.getHost(),
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mSettings.getPort(),
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mSettings.getClientCertificateAlias());
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mSocket.setSoTimeout(RemoteStore.SOCKET_READ_TIMEOUT);
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mIn = new PeekableInputStream(new BufferedInputStream(mSocket
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.getInputStream(), 1024));
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mParser = new ImapResponseParser(mIn);
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mOut = new BufferedOutputStream(mSocket.getOutputStream(), 1024);
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// Per RFC 2595 (3.1): Once TLS has been started, reissue CAPABILITY command
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if (K9MailLib.isDebug())
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Log.i(LOG_TAG, "Updating capabilities after STARTTLS for " + getLogId());
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capabilities.clear();
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List<ImapResponse> responses = receiveCapabilities(executeSimpleCommand(ImapCommands.COMMAND_CAPABILITY));
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if (responses.size() != 2) {
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throw new MessagingException("Invalid CAPABILITY response received");
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}
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} else {
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/*
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* This exception triggers a "Certificate error"
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* notification that takes the user to the incoming
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* server settings for review. This might be needed if
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* the account was configured with an obsolete
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* "STARTTLS (if available)" setting.
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*/
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throw new CertificateValidationException(
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"STARTTLS connection security not available");
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}
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}
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switch (mSettings.getAuthType()) {
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case CRAM_MD5:
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if (hasCapability(ImapCommands.CAPABILITY_AUTH_CRAM_MD5)) {
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authCramMD5();
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} else {
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throw new MessagingException(
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"Server doesn't support encrypted passwords using CRAM-MD5.");
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}
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break;
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case PLAIN:
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if (hasCapability(ImapCommands.CAPABILITY_AUTH_PLAIN)) {
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saslAuthPlain();
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} else if (!hasCapability(ImapCommands.CAPABILITY_LOGINDISABLED)) {
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login();
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} else {
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throw new MessagingException(
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"Server doesn't support unencrypted passwords using AUTH=PLAIN and LOGIN is disabled.");
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}
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break;
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case EXTERNAL:
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if (hasCapability(ImapCommands.CAPABILITY_AUTH_EXTERNAL)) {
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saslAuthExternal();
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} else {
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// Provide notification to user of a problem authenticating using client certificates
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throw new CertificateValidationException(CertificateValidationException.Reason.MissingCapability);
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}
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break;
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default:
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throw new MessagingException(
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"Unhandled authentication method found in the server settings (bug).");
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}
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authSuccess = true;
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if (K9MailLib.isDebug()) {
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Log.d(LOG_TAG, ImapCommands.CAPABILITY_COMPRESS_DEFLATE + " = " + hasCapability(ImapCommands.CAPABILITY_COMPRESS_DEFLATE));
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}
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if (hasCapability(ImapCommands.CAPABILITY_COMPRESS_DEFLATE)) {
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boolean useCompression = true;
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NetworkInfo netInfo = mConnectivityManager.getActiveNetworkInfo();
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if (netInfo != null) {
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int type = netInfo.getType();
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "On network type " + type);
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useCompression = mSettings.useCompression(type);
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}
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "useCompression " + useCompression);
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if (useCompression) {
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try {
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executeSimpleCommand(ImapCommands.COMMAND_COMPRESS_DEFLATE);
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Inflater inf = new Inflater(true);
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InflaterInputStream zInputStream = new InflaterInputStream(mSocket.getInputStream(), inf);
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mIn = new PeekableInputStream(new BufferedInputStream(zInputStream, 1024));
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mParser = new ImapResponseParser(mIn);
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ZOutputStream zOutputStream = new ZOutputStream(mSocket.getOutputStream(), JZlib.Z_BEST_SPEED, true);
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mOut = new BufferedOutputStream(zOutputStream, 1024);
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zOutputStream.setFlushMode(JZlib.Z_PARTIAL_FLUSH);
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if (K9MailLib.isDebug()) {
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Log.i(LOG_TAG, "Compression enabled for " + getLogId());
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}
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} catch (Exception e) {
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Log.e(LOG_TAG, "Unable to negotiate compression", e);
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}
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}
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}
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "NAMESPACE = " + hasCapability(ImapCommands.CAPABILITY_NAMESPACE)
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+ ", mPathPrefix = " + mSettings.getPathPrefix());
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if (mSettings.getPathPrefix() == null) {
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if (hasCapability(ImapCommands.CAPABILITY_NAMESPACE)) {
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if (K9MailLib.isDebug())
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Log.i(LOG_TAG, "mPathPrefix is unset and server has NAMESPACE capability");
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List<ImapResponse> namespaceResponses =
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executeSimpleCommand(ImapCommands.COMMAND_NAMESPACE);
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for (ImapResponse response : namespaceResponses) {
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if (ImapResponseParser.equalsIgnoreCase(response.get(0), ImapCommands.COMMAND_NAMESPACE)) {
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "Got NAMESPACE response " + response + " on " + getLogId());
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Object personalNamespaces = response.get(1);
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if (personalNamespaces != null && personalNamespaces instanceof ImapList) {
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "Got personal namespaces: " + personalNamespaces);
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ImapList bracketed = (ImapList)personalNamespaces;
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Object firstNamespace = bracketed.get(0);
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if (firstNamespace != null && firstNamespace instanceof ImapList) {
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "Got first personal namespaces: " + firstNamespace);
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bracketed = (ImapList)firstNamespace;
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mSettings.setPathPrefix(bracketed.getString(0));
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mSettings.setPathDelimeter(bracketed.getString(1));
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mSettings.setCombinedPrefix(null);
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "Got path '" + mSettings.getPathPrefix() + "' and separator '" + mSettings.getPathDelimeter() + "'");
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}
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}
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}
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}
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} else {
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if (K9MailLib.isDebug())
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Log.i(LOG_TAG, "mPathPrefix is unset but server does not have NAMESPACE capability");
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mSettings.setPathPrefix("");
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}
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}
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if (mSettings.getPathDelimeter() == null) {
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try {
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List<ImapResponse> nameResponses =
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executeSimpleCommand("LIST \"\" \"\"");
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for (ImapResponse response : nameResponses) {
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if (ImapResponseParser.equalsIgnoreCase(response.get(0), "LIST")) {
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mSettings.setPathDelimeter(response.getString(2));
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mSettings.setCombinedPrefix(null);
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if (K9MailLib.isDebug())
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Log.d(LOG_TAG, "Got path delimeter '" + mSettings.getPathDelimeter() + "' for " + getLogId());
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}
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}
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} catch (Exception e) {
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Log.e(LOG_TAG, "Unable to get path delimeter using LIST", e);
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}
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}
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} catch (SSLException e) {
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if (e.getCause() instanceof CertificateException) {
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throw new CertificateValidationException(e.getMessage(), e);
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} else {
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throw e;
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}
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} catch (GeneralSecurityException gse) {
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throw new MessagingException(
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"Unable to open connection to IMAP server due to security error.", gse);
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} catch (ConnectException ce) {
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String ceMess = ce.getMessage();
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String[] tokens = ceMess.split("-");
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if (tokens.length > 1 && tokens[1] != null) {
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Log.e(LOG_TAG, "Stripping host/port from ConnectionException for " + getLogId(), ce);
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throw new ConnectException(tokens[1].trim());
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} else {
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throw ce;
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}
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} finally {
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if (!authSuccess) {
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Log.e(LOG_TAG, "Failed to login, closing connection for " + getLogId());
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close();
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}
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}
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}
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protected void login() throws IOException, MessagingException {
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/*
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* Use quoted strings which permit spaces and quotes. (Using IMAP
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* string literals would be better, but some servers are broken
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* and don't parse them correctly.)
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*/
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// escape double-quotes and backslash characters with a backslash
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Pattern p = Pattern.compile("[\\\\\"]");
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String replacement = "\\\\$0";
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String username = p.matcher(mSettings.getUsername()).replaceAll(
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replacement);
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String password = p.matcher(mSettings.getPassword()).replaceAll(
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replacement);
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try {
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receiveCapabilities(executeSimpleCommand(
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String.format("LOGIN \"%s\" \"%s\"", username, password), true));
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} catch (ImapStore.ImapException e) {
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throw new AuthenticationFailedException(e.getMessage());
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}
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}
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protected void authCramMD5() throws MessagingException, IOException {
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String command = "AUTHENTICATE CRAM-MD5";
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String tag = sendCommand(command, false);
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ImapResponse response = readContinuationResponse(tag);
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if (response.size() != 1 || !(response.get(0) instanceof String)) {
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throw new MessagingException("Invalid Cram-MD5 nonce received");
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}
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byte[] b64Nonce = response.getString(0).getBytes();
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byte[] b64CRAM = Authentication.computeCramMd5Bytes(
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mSettings.getUsername(), mSettings.getPassword(), b64Nonce);
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mOut.write(b64CRAM);
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mOut.write('\r');
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mOut.write('\n');
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mOut.flush();
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try {
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receiveCapabilities(readStatusResponse(tag, command, null));
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} catch (MessagingException e) {
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throw new AuthenticationFailedException(e.getMessage());
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}
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}
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protected void saslAuthPlain() throws IOException, MessagingException {
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String command = "AUTHENTICATE PLAIN";
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String tag = sendCommand(command, false);
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readContinuationResponse(tag);
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mOut.write(Base64.encodeBase64(("\000" + mSettings.getUsername()
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+ "\000" + mSettings.getPassword()).getBytes()));
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mOut.write('\r');
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mOut.write('\n');
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mOut.flush();
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try {
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receiveCapabilities(readStatusResponse(tag, command, null));
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} catch (MessagingException e) {
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throw new AuthenticationFailedException(e.getMessage());
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}
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}
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private void saslAuthExternal() throws IOException, MessagingException {
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try {
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receiveCapabilities(executeSimpleCommand(
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String.format("AUTHENTICATE EXTERNAL %s",
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Base64.encode(mSettings.getUsername())), false));
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} catch (ImapStore.ImapException e) {
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/*
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* Provide notification to the user of a problem authenticating
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* using client certificates. We don't use an
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* AuthenticationFailedException because that would trigger a
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* "Username or password incorrect" notification in
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* AccountSetupCheckSettings.
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*/
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throw new CertificateValidationException(e.getMessage());
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}
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}
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protected ImapResponse readContinuationResponse(String tag)
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throws IOException, MessagingException {
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ImapResponse response;
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do {
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response = readResponse();
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if (response.mTag != null) {
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if (response.mTag.equalsIgnoreCase(tag)) {
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throw new MessagingException(
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"Command continuation aborted: " + response);
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} else {
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Log.w(LOG_TAG, "After sending tag " + tag
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+ ", got tag response from previous command "
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+ response + " for " + getLogId());
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}
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}
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} while (!response.mCommandContinuationRequested);
|
|
return response;
|
|
}
|
|
|
|
protected List<ImapResponse> readStatusResponse(String tag,
|
|
String commandToLog, ImapStore.UntaggedHandler untaggedHandler)
|
|
throws IOException, MessagingException {
|
|
List<ImapResponse> responses = new ArrayList<ImapResponse>();
|
|
ImapResponse response;
|
|
do {
|
|
response = mParser.readResponse();
|
|
if (K9MailLib.isDebug() && DEBUG_PROTOCOL_IMAP)
|
|
Log.v(LOG_TAG, getLogId() + "<<<" + response);
|
|
|
|
if (response.mTag != null && !response.mTag.equalsIgnoreCase(tag)) {
|
|
Log.w(LOG_TAG, "After sending tag " + tag + ", got tag response from previous command " + response + " for " + getLogId());
|
|
Iterator<ImapResponse> iter = responses.iterator();
|
|
while (iter.hasNext()) {
|
|
ImapResponse delResponse = iter.next();
|
|
if (delResponse.mTag != null || delResponse.size() < 2
|
|
|| (!ImapResponseParser.equalsIgnoreCase(delResponse.get(1), "EXISTS") && !ImapResponseParser.equalsIgnoreCase(delResponse.get(1), "EXPUNGE"))) {
|
|
iter.remove();
|
|
}
|
|
}
|
|
response.mTag = null;
|
|
continue;
|
|
}
|
|
if (untaggedHandler != null) {
|
|
untaggedHandler.handleAsyncUntaggedResponse(response);
|
|
}
|
|
responses.add(response);
|
|
} while (response.mTag == null);
|
|
if (response.size() < 1 || !ImapResponseParser.equalsIgnoreCase(response.get(0), "OK")) {
|
|
throw new ImapStore.ImapException("Command: " + commandToLog + "; response: " + response.toString(), response.getAlertText());
|
|
}
|
|
return responses;
|
|
}
|
|
|
|
protected void setReadTimeout(int millis) throws SocketException {
|
|
Socket sock = mSocket;
|
|
if (sock != null) {
|
|
sock.setSoTimeout(millis);
|
|
}
|
|
}
|
|
|
|
protected boolean isIdleCapable() {
|
|
if (K9MailLib.isDebug())
|
|
Log.v(LOG_TAG, "Connection " + getLogId() + " has " + capabilities.size() + " capabilities");
|
|
|
|
return capabilities.contains(ImapCommands.CAPABILITY_IDLE);
|
|
}
|
|
|
|
protected boolean hasCapability(String capability) {
|
|
return capabilities.contains(capability.toUpperCase(Locale.US));
|
|
}
|
|
|
|
public boolean isOpen() {
|
|
return (mIn != null && mOut != null && mSocket != null && mSocket.isConnected() && !mSocket.isClosed());
|
|
}
|
|
|
|
public void close() {
|
|
// if (isOpen()) {
|
|
// try {
|
|
// executeSimpleCommand("LOGOUT");
|
|
// } catch (Exception e) {
|
|
//
|
|
// }
|
|
// }
|
|
IOUtils.closeQuietly(mIn);
|
|
IOUtils.closeQuietly(mOut);
|
|
IOUtils.closeQuietly(mSocket);
|
|
mIn = null;
|
|
mOut = null;
|
|
mSocket = null;
|
|
}
|
|
|
|
public ImapResponse readResponse() throws IOException, MessagingException {
|
|
return readResponse(null);
|
|
}
|
|
|
|
public ImapResponse readResponse(ImapResponseParser.IImapResponseCallback callback) throws IOException {
|
|
try {
|
|
ImapResponse response = mParser.readResponse(callback);
|
|
if (K9MailLib.isDebug() && DEBUG_PROTOCOL_IMAP)
|
|
Log.v(LOG_TAG, getLogId() + "<<<" + response);
|
|
|
|
return response;
|
|
} catch (IOException ioe) {
|
|
close();
|
|
throw ioe;
|
|
}
|
|
}
|
|
|
|
public void sendContinuation(String continuation) throws IOException {
|
|
mOut.write(continuation.getBytes());
|
|
mOut.write('\r');
|
|
mOut.write('\n');
|
|
mOut.flush();
|
|
|
|
if (K9MailLib.isDebug() && DEBUG_PROTOCOL_IMAP)
|
|
Log.v(LOG_TAG, getLogId() + ">>> " + continuation);
|
|
|
|
}
|
|
|
|
public String sendCommand(String command, boolean sensitive)
|
|
throws MessagingException, IOException {
|
|
try {
|
|
open();
|
|
String tag = Integer.toString(mNextCommandTag++);
|
|
String commandToSend = tag + " " + command + "\r\n";
|
|
mOut.write(commandToSend.getBytes());
|
|
mOut.flush();
|
|
|
|
if (K9MailLib.isDebug() && DEBUG_PROTOCOL_IMAP) {
|
|
if (sensitive && !K9MailLib.isDebugSensitive()) {
|
|
Log.v(LOG_TAG, getLogId() + ">>> "
|
|
+ "[Command Hidden, Enable Sensitive Debug Logging To Show]");
|
|
} else {
|
|
Log.v(LOG_TAG, getLogId() + ">>> " + commandToSend);
|
|
}
|
|
}
|
|
|
|
return tag;
|
|
} catch (IOException ioe) {
|
|
close();
|
|
throw ioe;
|
|
} catch (ImapStore.ImapException ie) {
|
|
close();
|
|
throw ie;
|
|
} catch (MessagingException me) {
|
|
close();
|
|
throw me;
|
|
}
|
|
}
|
|
|
|
public List<ImapResponse> executeSimpleCommand(String command) throws IOException,
|
|
MessagingException {
|
|
return executeSimpleCommand(command, false, null);
|
|
}
|
|
|
|
public List<ImapResponse> executeSimpleCommand(String command, boolean sensitive) throws IOException,
|
|
MessagingException {
|
|
return executeSimpleCommand(command, sensitive, null);
|
|
}
|
|
|
|
public List<ImapResponse> executeSimpleCommand(String command, boolean sensitive, ImapStore.UntaggedHandler untaggedHandler)
|
|
throws IOException, MessagingException {
|
|
String commandToLog = command;
|
|
if (sensitive && !K9MailLib.isDebugSensitive()) {
|
|
commandToLog = "*sensitive*";
|
|
}
|
|
|
|
|
|
//if (K9MailLib.isDebug())
|
|
// Log.v(LOG_TAG, "Sending IMAP command " + commandToLog + " on connection " + getLogId());
|
|
|
|
String tag = sendCommand(command, sensitive);
|
|
//if (K9MailLib.isDebug())
|
|
// Log.v(LOG_TAG, "Sent IMAP command " + commandToLog + " with tag " + tag + " for " + getLogId());
|
|
|
|
return readStatusResponse(tag, commandToLog, untaggedHandler);
|
|
}
|
|
}
|