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annotate src/ch/ethz/ssh2/ServerAuthenticationCallback.java @ 273:91a31873c42a ganymed

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author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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1 /*
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2 * Copyright (c) 2012-2013 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5
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6 package ch.ethz.ssh2;
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7
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8 /**
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9 * A callback used during the authentication phase (see RFC 4252) when
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10 * implementing a SSH server.
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11 *
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12 * @author Christian Plattner
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13 * @version 2.50, 03/15/10
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14 */
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15 public interface ServerAuthenticationCallback
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16 {
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17 /**
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18 * The method name for host-based authentication.
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19 */
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20 public final String METHOD_HOSTBASED = "hostbased";
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21
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22 /**
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23 * The method name for public-key authentication.
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24 */
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25 public final String METHOD_PUBLICKEY = "publickey";
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26
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27 /**
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28 * The method name for password authentication.
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29 */
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30 public final String METHOD_PASSWORD = "password";
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31
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32 /**
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33 * Called when the client enters authentication.
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34 * This gives you the chance to set a custom authentication banner
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35 * for this SSH-2 session. This is the first method called in this interface.
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36 * It will only called at most once per <code>ServerConnection</code>.
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37 *
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38 * @param sc The corresponding <code>ServerConnection</code>
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39 * @return The authentication banner or <code>NULL</code> in case no banner should be send.
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40 */
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41 public String initAuthentication(ServerConnection sc);
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42
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43 /**
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44 * Return the authentication methods that are currently available to the client.
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45 * Be prepared to return this information at any time during the authentication procedure.
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46 * <p/>
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47 * The returned name-list of 'method names' (see RFC4252) indicate the authentication methods
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48 * that may productively continue the authentication dialog.
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49 * </p>
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50 * It is RECOMMENDED that servers only include those 'method name'
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51 * values in the name-list that are actually useful. However, it is not
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52 * illegal to include 'method name' values that cannot be used to
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53 * authenticate the user.
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54 * <p/>
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55 * Already successfully completed authentications SHOULD NOT be included
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56 * in the name-list, unless they should be performed again for some reason.
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57 *
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58 * @see #METHOD_HOSTBASED
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59 * @see #METHOD_PASSWORD
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60 * @see #METHOD_PUBLICKEY
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61 *
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62 * @param sc
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63 * @return A list of method names.
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64 */
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65 public String[] getRemainingAuthMethods(ServerConnection sc);
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66
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67 /**
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68 * Typically, this will be called be the client to get the list of
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69 * authentication methods that can continue. You should simply return
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70 * {@link AuthenticationResult#FAILURE}.
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71 *
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72 * @param sc
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73 * @param username Name of the user that wants to log in with the "none" method.
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74 * @return
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75 */
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76 public AuthenticationResult authenticateWithNone(ServerConnection sc, String username);
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77
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78 public AuthenticationResult authenticateWithPassword(ServerConnection sc, String username, String password);
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79
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80 /**
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81 * NOTE: Not implemented yet.
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82 *
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83 * @param sc
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84 * @param username
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85 * @param algorithm
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86 * @param publickey
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87 * @param signature
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88 * @return
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89 */
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90 public AuthenticationResult authenticateWithPublicKey(ServerConnection sc, String username, String algorithm,
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91 byte[] publickey, byte[] signature);
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92 }