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Code Issues Releases Wiki Activity

Initial implementation of CRAM-MD5 support for IMAP and SMTP.

Browse Source 
Patch contributed by Russ Weeks <rweeks@gmail.com> in
<605ac1c0-808a-4f67-8c4d-736eec9587f8@e27g2000yqd.googlegroups.com>
This commit is contained in:
Jesse Vincent 2009-12-20 05:15:20 +00:00
parent 921b022fb5
commit 5a85446779
5 changed files with 203 additions and 16 deletions
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10
res/layout/account_setup_incoming.xml
View File

@ -62,6 +62,16 @@
android:id="@+id/account_security_type"
android:layout_height="wrap_content"
android:layout_width="fill_parent" />
<TextView
android:text="@string/account_setup_incoming_authtype_label"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="?android:attr/textColorPrimary" />
<Spinner
android:id="@+id/account_auth_type"
android:layout_height="wrap_content"
android:layout_width="fill_parent" />
<TextView
android:text="@string/account_setup_incoming_port_label"
android:layout_height="wrap_content"

1
res/values/strings.xml
View File

@ -298,6 +298,7 @@ Welcome to K-9 Mail setup. K-9 is an open source mail client for Android origin
<string name="account_setup_incoming_webdav_server_label">WebDAV (Exchange) server</string>
<string name="account_setup_incoming_port_label">Port</string>
<string name="account_setup_incoming_security_label">Security type</string>
<string name="account_setup_incoming_authtype_label">Authentication type</string>
<string name="account_setup_incoming_security_none_label">None</string>
<string name="account_setup_incoming_security_ssl_optional_label">SSL (if available)</string>
<string name="account_setup_incoming_security_ssl_label">SSL (always)</string>

27
src/com/fsck/k9/activity/setup/AccountSetupIncoming.java
View File

@ -59,6 +59,7 @@ public class AccountSetupIncoming extends K9Activity implements OnClickListener
private EditText mServerView;
private EditText mPortView;
private Spinner mSecurityTypeView;
private Spinner mAuthTypeView;
private EditText mImapPathPrefixView;
private Button mImapFolderDrafts;
private Button mImapFolderSent;
@ -99,6 +100,7 @@ public class AccountSetupIncoming extends K9Activity implements OnClickListener
mServerView = (EditText)findViewById(R.id.account_server);
mPortView = (EditText)findViewById(R.id.account_port);
mSecurityTypeView = (Spinner)findViewById(R.id.account_security_type);
mAuthTypeView = (Spinner)findViewById(R.id.account_auth_type);
mImapPathPrefixView = (EditText)findViewById(R.id.imap_path_prefix);
mImapFolderDrafts = (Button)findViewById(R.id.account_imap_folder_drafts);
mImapFolderSent = (Button)findViewById(R.id.account_imap_folder_sent);
@ -126,11 +128,22 @@ public class AccountSetupIncoming extends K9Activity implements OnClickListener
new SpinnerOption(4, getString(R.string.account_setup_incoming_security_tls_label)),
};
SpinnerOption authTypes[] =
{
new SpinnerOption(0, "PLAIN" ),
new SpinnerOption(1, "CRAM_MD5" )
};
ArrayAdapter<SpinnerOption> securityTypesAdapter = new ArrayAdapter<SpinnerOption>(this,
android.R.layout.simple_spinner_item, securityTypes);
securityTypesAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mSecurityTypeView.setAdapter(securityTypesAdapter);
ArrayAdapter<SpinnerOption> authTypesAdapter = new ArrayAdapter<SpinnerOption>(this,
android.R.layout.simple_spinner_item, authTypes);
authTypesAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mAuthTypeView.setAdapter(authTypesAdapter);
/*
* Updates the port when the user changes the security type. This allows
* us to show a reasonable default which the user can change.
@ -228,6 +241,7 @@ public class AccountSetupIncoming extends K9Activity implements OnClickListener
findViewById(R.id.imap_folder_setup_section).setVisibility(View.GONE);
findViewById(R.id.webdav_path_prefix_section).setVisibility(View.GONE);
findViewById(R.id.webdav_path_debug_section).setVisibility(View.GONE);
findViewById(R.id.account_auth_type).setVisibility(View.GONE);
mAccount.setDeletePolicy(Account.DELETE_POLICY_NEVER);
@ -261,6 +275,7 @@ public class AccountSetupIncoming extends K9Activity implements OnClickListener
/** Hide the unnecessary fields */
findViewById(R.id.imap_path_prefix_section).setVisibility(View.GONE);
findViewById(R.id.imap_folder_setup_section).setVisibility(View.GONE);
findViewById(R.id.account_auth_type).setVisibility(View.GONE);
if (uri.getPath() != null && uri.getPath().length() > 0)
{
String[] pathParts = uri.getPath().split("\\|");
@ -433,9 +448,19 @@ public class AccountSetupIncoming extends K9Activity implements OnClickListener
path = path + "|" + mWebdavMailboxPathView.getText();
}
final String userInfo;
if (mAccountSchemes[securityType].startsWith("imap"))
{
String authType = ((SpinnerOption)mAuthTypeView.getSelectedItem()).label;
userInfo = authType + ":" + mUsernameView.getText() + ":" + mPasswordView.getText();
}
else
{
userInfo = mUsernameView.getText() + ":" + mPasswordView.getText();
}
URI uri = new URI(
mAccountSchemes[securityType],
mUsernameView.getText() + ":" + mPasswordView.getText(),
userInfo,
mServerView.getText().toString(),
Integer.parseInt(mPortView.getText().toString()),
path, // path

123
src/com/fsck/k9/mail/store/ImapStore.java
View File

@ -16,12 +16,19 @@ import com.beetstra.jutf7.CharsetProvider;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.TrustManager;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import java.io.*;
import java.net.*;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.*;
@ -51,6 +58,8 @@ public class ImapStore extends Store
public static final int CONNECTION_SECURITY_SSL_REQUIRED = 3;
public static final int CONNECTION_SECURITY_SSL_OPTIONAL = 4;
private enum AuthType { PLAIN, CRAM_MD5 };
private static final int IDLE_READ_TIMEOUT = 29 * 60 * 1000; // 29 minutes
private static final int IDLE_REFRESH_INTERVAL = 20 * 60 * 1000; // 20 minutes
@ -66,6 +75,7 @@ public class ImapStore extends Store
private String mUsername;
private String mPassword;
private int mConnectionSecurity;
private AuthType mAuthType;
private volatile String mPathPrefix;
private volatile String mCombinedPrefix = null;
private volatile String mPathDelimeter;
@ -87,11 +97,11 @@ public class ImapStore extends Store
private HashMap<String, ImapFolder> mFolderCache = new HashMap<String, ImapFolder>();
/**
* imap://user:password@server:port CONNECTION_SECURITY_NONE
* imap+tls://user:password@server:port CONNECTION_SECURITY_TLS_OPTIONAL
* imap+tls+://user:password@server:port CONNECTION_SECURITY_TLS_REQUIRED
* imap+ssl+://user:password@server:port CONNECTION_SECURITY_SSL_REQUIRED
* imap+ssl://user:password@server:port CONNECTION_SECURITY_SSL_OPTIONAL
* imap://auth:user:password@server:port CONNECTION_SECURITY_NONE
* imap+tls://auth:user:password@server:port CONNECTION_SECURITY_TLS_OPTIONAL
* imap+tls+://auth:user:password@server:port CONNECTION_SECURITY_TLS_REQUIRED
* imap+ssl+://auth:user:password@server:port CONNECTION_SECURITY_SSL_REQUIRED
* imap+ssl://auth:user:password@server:port CONNECTION_SECURITY_SSL_OPTIONAL
*
* @param _uri
*/
@ -147,12 +157,10 @@ public class ImapStore extends Store
if (uri.getUserInfo() != null)
{
String[] userInfoParts = uri.getUserInfo().split(":", 2);
mUsername = userInfoParts[0];
if (userInfoParts.length > 1)
{
mPassword = userInfoParts[1];
}
String[] userInfoParts = uri.getUserInfo().split(":");
mAuthType = AuthType.valueOf(userInfoParts[0]);
mUsername = userInfoParts[1];
mPassword = userInfoParts[2];
}
if ((uri.getPath() != null) && (uri.getPath().length() > 0))
@ -1899,9 +1907,14 @@ public class ImapStore extends Store
try
{
// TODO eventually we need to add additional authentication
// options such as SASL
executeSimpleCommand("LOGIN \"" + escapeString(mUsername) + "\" \"" + escapeString(mPassword) + "\"", true);
if ( mAuthType == AuthType.CRAM_MD5 )
{
authCramMD5();
}
else if ( mAuthType == AuthType.PLAIN )
{
executeSimpleCommand("LOGIN \"" + escapeString(mUsername) + "\" \"" + escapeString(mPassword) + "\"", true);
}
authSuccess = true;
}
catch (ImapException ie)
@ -2002,6 +2015,88 @@ public class ImapStore extends Store
}
}
protected void authCramMD5() throws AuthenticationFailedException, MessagingException
{
try
{
String tag = sendCommand("AUTHENTICATE CRAM-MD5", false);
byte[] buf = new byte[ 1024 ];
int b64NonceLen = 0;
for ( int i = 0; i < buf.length; i++ )
{
buf[ i ] = (byte)mIn.read();
if ( buf[i] == 0x0a )
{
b64NonceLen = i;
break;
}
}
if ( b64NonceLen == 0 )
{
throw new AuthenticationFailedException( "Error negotiating CRAM-MD5: nonce too long." );
}
byte[] b64NonceTrim = new byte[ b64NonceLen - 2 ];
System.arraycopy(buf, 1, b64NonceTrim, 0, b64NonceLen - 2);
byte[] nonce = Base64.decodeBase64(b64NonceTrim);
if ( K9.DEBUG )
{
Log.d(K9.LOG_TAG, "Got nonce: " + new String( b64NonceTrim, "US-ASCII" ) );
Log.d(K9.LOG_TAG, "Plaintext nonce: " + new String( nonce, "US-ASCII" ) );
}
byte[] ipad = new byte[64];
byte[] opad = new byte[64];
byte[] secretBytes = mPassword.getBytes("US-ASCII");
MessageDigest md = MessageDigest.getInstance("MD5");
if ( secretBytes.length > 64 )
{
secretBytes = md.digest(secretBytes);
}
System.arraycopy(secretBytes, 0, ipad, 0, secretBytes.length);
System.arraycopy(secretBytes, 0, opad, 0, secretBytes.length);
for ( int i = 0; i < ipad.length; i++ ) ipad[i] ^= 0x36;
for ( int i = 0; i < opad.length; i++ ) opad[i] ^= 0x5c;
md.update(ipad);
byte[] firstPass = md.digest(nonce);
md.update(opad);
byte[] result = md.digest(firstPass);
String plainCRAM = mUsername + " " + new String(Hex.encodeHex(result));
byte[] b64CRAM = Base64.encodeBase64(plainCRAM.getBytes("US-ASCII"));
if ( K9.DEBUG )
{
Log.d(K9.LOG_TAG, "Username == " + mUsername);
Log.d( K9.LOG_TAG, "plainCRAM: " + plainCRAM );
Log.d( K9.LOG_TAG, "b64CRAM: " + new String(b64CRAM, "US-ASCII"));
}
mOut.write( b64CRAM );
mOut.write( new byte[] { 0x0d, 0x0a } );
mOut.flush();
int respLen = 0;
for ( int i = 0; i < buf.length; i++ )
{
buf[ i ] = (byte)mIn.read();
if ( buf[i] == 0x0a )
{
respLen = i;
break;
}
}
String toMatch = tag + " OK";
String respStr = new String( buf, 0, respLen );
if ( !respStr.startsWith( toMatch ) )
{
throw new AuthenticationFailedException( "CRAM-MD5 error: " + respStr );
}
}
catch ( IOException ioe )
{
throw new AuthenticationFailedException( "CRAM-MD5 Auth Failed." );
}
catch ( NoSuchAlgorithmException nsae )
{
throw new AuthenticationFailedException( "MD5 Not Available." );
}
}
protected void setReadTimeout(int millis) throws SocketException
{
mSocket.setSoTimeout(millis);

58
src/com/fsck/k9/mail/transport/SmtpTransport.java
View File

@ -18,7 +18,10 @@ import java.io.IOException;
import java.io.OutputStream;
import java.net.*;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import org.apache.commons.codec.binary.Hex;
import java.util.ArrayList;
import java.util.List;
@ -222,6 +225,7 @@ public class SmtpTransport extends Transport
*/
boolean authLoginSupported = false;
boolean authPlainSupported = false;
boolean authCramMD5Supported = false;
for (String result : results)
{
if (result.matches(".*AUTH.*LOGIN.*$") == true)
@ -232,12 +236,20 @@ public class SmtpTransport extends Transport
{
authPlainSupported = true;
}
if (result.matches(".*AUTH.*CRAM-MD5.*$") == true)
{
authCramMD5Supported = true;
}
}
if (mUsername != null && mUsername.length() > 0 && mPassword != null
&& mPassword.length() > 0)
{
if (authPlainSupported)
if (authCramMD5Supported)
{
saslAuthCramMD5(mUsername, mPassword);
}
else if (authPlainSupported)
{
saslAuthPlain(mUsername, mPassword);
}
@ -484,4 +496,48 @@ public class SmtpTransport extends Transport
throw me;
}
}
private void saslAuthCramMD5(String username, String password) throws MessagingException,
AuthenticationFailedException, IOException
{
List<String> respList = executeSimpleCommand( "AUTH CRAM-MD5" );
if ( respList.size() != 1 ) throw new AuthenticationFailedException( "Unable to negotiate CRAM-MD5" );
String b64Nonce = respList.get(0);
byte[] nonce = Base64.decodeBase64( b64Nonce.getBytes("US-ASCII") );
byte[] ipad = new byte[64];
byte[] opad = new byte[64];
byte[] secretBytes = password.getBytes("US-ASCII");
MessageDigest md;
try
{
md = MessageDigest.getInstance("MD5");
}
catch ( NoSuchAlgorithmException nsae )
{
throw new AuthenticationFailedException( "MD5 Not Available." );
}
if ( secretBytes.length > 64 )
{
secretBytes = md.digest(secretBytes);
}
System.arraycopy(secretBytes, 0, ipad, 0, secretBytes.length);
System.arraycopy(secretBytes, 0, opad, 0, secretBytes.length);
for ( int i = 0; i < ipad.length; i++ ) ipad[i] ^= 0x36;
for ( int i = 0; i < opad.length; i++ ) opad[i] ^= 0x5c;
md.update(ipad);
byte[] firstPass = md.digest(nonce);
md.update(opad);
byte[] result = md.digest(firstPass);
String plainCRAM = username + " " + new String(Hex.encodeHex(result));
byte[] b64CRAM = Base64.encodeBase64(plainCRAM.getBytes("US-ASCII"));
String b64CRAMString = new String( b64CRAM, "US-ASCII" );
try
{
executeSimpleCommand( b64CRAMString );
}
catch ( MessagingException me )
{
throw new AuthenticationFailedException( "Unable to negotiate MD5 CRAM" );
}
}
}