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annotate src/ch/ethz/ssh2/auth/ServerAuthenticationManager.java @ 417:4dcc071e1feb

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monitor failure should not kill the TE
author Carl Byington <carl@five-ten-sg.com>
date Wed, 29 Oct 2014 12:12:48 -0700
parents 071eccdff8ea
children
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1
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2 package ch.ethz.ssh2.auth;
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3
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4 import java.io.IOException;
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5 import java.util.Arrays;
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6 import java.util.HashSet;
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7 import java.util.Set;
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8
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9 import ch.ethz.ssh2.AuthenticationResult;
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10 import ch.ethz.ssh2.PacketTypeException;
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11 import ch.ethz.ssh2.ServerAuthenticationCallback;
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12 import ch.ethz.ssh2.channel.ChannelManager;
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13 import ch.ethz.ssh2.packets.PacketServiceAccept;
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14 import ch.ethz.ssh2.packets.PacketServiceRequest;
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15 import ch.ethz.ssh2.packets.PacketUserauthBanner;
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16 import ch.ethz.ssh2.packets.PacketUserauthFailure;
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17 import ch.ethz.ssh2.packets.PacketUserauthSuccess;
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18 import ch.ethz.ssh2.packets.Packets;
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19 import ch.ethz.ssh2.packets.TypesReader;
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20 import ch.ethz.ssh2.server.ServerConnectionState;
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21 import ch.ethz.ssh2.transport.MessageHandler;
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22
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23 public class ServerAuthenticationManager implements MessageHandler {
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24 private final ServerConnectionState state;
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25
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26 public ServerAuthenticationManager(ServerConnectionState state) {
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27 this.state = state;
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28 state.tm.registerMessageHandler(this, 0, 255);
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29 }
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31 private void sendresult(AuthenticationResult result) throws IOException {
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32 if (AuthenticationResult.SUCCESS == result) {
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33 PacketUserauthSuccess pus = new PacketUserauthSuccess();
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34 state.tm.sendAsynchronousMessage(pus.getPayload());
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35 state.tm.removeMessageHandler(this);
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36 state.tm.registerMessageHandler(this, 50, 79);
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37 state.cm = new ChannelManager(state);
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38 state.flag_auth_completed = true;
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39 }
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40 else {
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41 Set<String> remaining_methods = new HashSet<String>();
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42
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43 if (state.cb_auth != null) {
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44 remaining_methods.addAll(Arrays.asList(
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45 state.cb_auth.getRemainingAuthMethods(state.conn)));
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46 }
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47
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48 PacketUserauthFailure puf = new PacketUserauthFailure(remaining_methods,
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49 AuthenticationResult.PARTIAL_SUCCESS == result);
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50 state.tm.sendAsynchronousMessage(puf.getPayload());
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51 }
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52 }
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54 public void handleFailure(final IOException failure) {
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55 //
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56 }
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57
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58 public void handleMessage(byte[] msg) throws IOException {
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59 /* Ignore all authentication messages after successful auth */
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60 if (state.flag_auth_completed) {
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61 return;
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62 }
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63
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64 if (!state.flag_auth_serviceRequested) {
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65 /* Must be PacketServiceRequest */
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66 PacketServiceRequest psr = new PacketServiceRequest(msg);
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67
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68 if (!"ssh-userauth".equals(psr.getServiceName())) {
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69 throw new IOException("SSH protocol error, expected ssh-userauth service request");
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70 }
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71
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72 PacketServiceAccept psa = new PacketServiceAccept("ssh-userauth");
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73 state.tm.sendAsynchronousMessage(psa.getPayload());
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74 String banner = state.cb_auth.initAuthentication(state.conn);
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75
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76 if (banner != null) {
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77 PacketUserauthBanner pub = new PacketUserauthBanner(banner);
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78 state.tm.sendAsynchronousMessage(pub.getPayload());
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79 }
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81 state.flag_auth_serviceRequested = true;
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82 return;
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83 }
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84
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85 ServerAuthenticationCallback cb = state.cb_auth;
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86 TypesReader tr = new TypesReader(msg);
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87 int packet_type = tr.readByte();
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88
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89 if (packet_type == Packets.SSH_MSG_USERAUTH_REQUEST) {
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90 String username = tr.readString("UTF-8");
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91 String service = tr.readString();
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92 String method = tr.readString();
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93
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94 if (!"ssh-connection".equals(service)) {
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95 sendresult(AuthenticationResult.FAILURE);
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96 return;
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97 }
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98
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99 if ("none".equals(method)) {
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100 if (cb != null) {
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101 sendresult(cb.authenticateWithNone(state.conn, username));
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102 return;
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103 }
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104 }
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105
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106 if ("password".equals(method)) {
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107 boolean flag_change_pass = tr.readBoolean();
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108
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109 if (flag_change_pass) {
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110 sendresult(AuthenticationResult.FAILURE);
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111 return;
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112 }
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113
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114 String password = tr.readString("UTF-8");
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115
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116 if (cb != null) {
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117 sendresult(cb.authenticateWithPassword(state.conn, username, password));
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118 return;
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119 }
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120 }
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121
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122 sendresult(AuthenticationResult.FAILURE);
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123 return;
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124 }
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125
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126 throw new PacketTypeException(packet_type);
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127 }
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128 }