org.argeo.slc.support/src/org/argeo/slc/jsch/CallbackHandlerUserInfo.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.slc.jsch;
  17
  18 import javax.security.auth.callback.Callback;
  19 import javax.security.auth.callback.CallbackHandler;
  20 import javax.security.auth.callback.PasswordCallback;
  21
  22 import org.argeo.slc.SlcException;
  23
  24 /** Retrieve a password or a passphrase using a standard callback handler. */
  25 public final class CallbackHandlerUserInfo extends SimpleUserInfo {
  26         private CallbackHandler callbackHandler;
  27
  28         private Boolean alwaysPrompt = false;
  29
  30         public boolean promptPassphrase(String message) {
  31                 if (passphrase != null)
  32                         return true;
  33
  34                 if (!alwaysPrompt && passphraseSafe != null)
  35                         return true;
  36
  37                 reset();
  38                 PasswordCallback passwordCb = new PasswordCallback("SSH Passphrase",
  39                                 false);
  40                 Callback[] dialogCbs = new Callback[] { passwordCb };
  41                 try {
  42                         callbackHandler.handle(dialogCbs);
  43                         passphraseSafe = passwordCb.getPassword();
  44                         return passphraseSafe != null;
  45                 } catch (Exception e) {
  46                         throw new SlcException("Cannot ask for a password", e);
  47                 }
  48         }
  49
  50         public boolean promptPassword(String message) {
  51                 if (password != null)
  52                         return true;
  53
  54                 if (!alwaysPrompt && passwordSafe != null)
  55                         return true;
  56
  57                 reset();
  58                 PasswordCallback passwordCb = new PasswordCallback("SSH Password",
  59                                 false);
  60                 Callback[] dialogCbs = new Callback[] { passwordCb };
  61                 try {
  62                         callbackHandler.handle(dialogCbs);
  63                         passwordSafe = passwordCb.getPassword();
  64                         return passwordSafe != null;
  65                 } catch (Exception e) {
  66                         throw new SlcException("Cannot ask for a password", e);
  67                 }
  68         }
  69
  70         public void setAlwaysPrompt(Boolean alwaysPrompt) {
  71                 this.alwaysPrompt = alwaysPrompt;
  72         }
  73
  74         public void setCallbackHandler(CallbackHandler defaultCallbackHandler) {
  75                 this.callbackHandler = defaultCallbackHandler;
  76         }
  77
  78 }