private void login() throws MessagingException {
executeSimpleCommand(USER_COMMAND + " " + mUsername);
try {
executeSimpleCommand(PASS_COMMAND + " " + mPassword, true);
} catch (Pop3ErrorResponse e) {
throw new AuthenticationFailedException(
"POP3 login authentication failed: " + e.getMessage(), e);
}
}
private void authCramMD5() throws MessagingException {
String b64Nonce = executeSimpleCommand("AUTH CRAM-MD5").replace("+ ", "");
String b64CRAM = Authentication.computeCramMd5(mUsername, mPassword, b64Nonce);
try {
executeSimpleCommand(b64CRAM, true);
} catch (Pop3ErrorResponse e) {
throw new AuthenticationFailedException(
"POP3 CRAM-MD5 authentication failed: " + e.getMessage(), e);
}
}
private void authPlain() throws MessagingException {
executeSimpleCommand("AUTH PLAIN");
try {
byte[] encodedBytes =
Base64.encodeBase64(("\000" + mUsername + "\000" + mPassword).getBytes());
executeSimpleCommand(new String(encodedBytes), true);
} catch (Pop3ErrorResponse e) {
throw new AuthenticationFailedException(
"POP3 SASL auth PLAIN authentication failed: " + e.getMessage(), e);
}
}
private void authExternal() throws MessagingException {
try {
executeSimpleCommand(String.format("AUTH EXTERNAL %s", Base64.encode(mUsername)), false);
} catch (Pop3ErrorResponse e) {
/*
* Provide notification to the user of a problem authenticating
* using client certificates. We don't use an
* AuthenticationFailedException because that would trigger a
* "Username or password incorrect" notification in
* AccountSetupCheckSettings.
*/
throw new CertificateValidationException(
"POP3 client certificate authentication failed: " + e.getMessage(), e);
}
}
private void authAPOP(String serverGreeting) throws MessagingException {
// regex based on RFC 2449 (3.) "Greeting"
String timestamp =
serverGreeting.replaceFirst("^\\+OK *(?:\\[[^\\]]+\\])?[^<]*(<[^>]*>)?[^<]*$", "$1");
if ("".equals(timestamp)) {
throw new MessagingException("APOP authentication is not supported");
}
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
throw new MessagingException("MD5 failure during POP3 auth APOP", e);
}
byte[] digest = md.digest((timestamp + mPassword).getBytes());
String hexDigest = new String(Hex.encodeHex(digest));
try {
executeSimpleCommand("APOP " + mUsername + " " + hexDigest, true);
} catch (Pop3ErrorResponse e) {
throw new AuthenticationFailedException(
"POP3 APOP authentication failed: " + e.getMessage(), e);
}
}