Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/remote/ProxyVerifier.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.remote;
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2
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3 import java.io.Serializable;
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4 import java.io.IOException;
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5 import java.io.InvalidObjectException;
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6 import java.io.ObjectInputStream;
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7
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8 import java.rmi.RemoteException;
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9
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10 import net.jini.security.TrustVerifier;
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11
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12 import net.jini.security.proxytrust.TrustEquivalence;
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13
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14 import net.jini.core.constraint.RemoteMethodControl;
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15 import net.jini.core.constraint.MethodConstraints;
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16
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17 import net.jini.id.Uuid;
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18
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19 /**
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20 This class is responsible for verifying any of Blitz's proxy implementations
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21 including LeaseImpl, BlitzProxy, AdminProxy and TxnParticipantProxy
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22 */
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23 class ProxyVerifier implements TrustVerifier, Serializable {
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24 private RemoteMethodControl theOriginalStub;
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25 private Uuid theOriginalUuid;
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26
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27 /**
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28 Ensures that the passed stub meets the necessary criteria for
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29 TrustVerification. If the stub does not qualify, we throw an
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30 UnsupportedOperationException. This set of tests is necessary due
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31 to the fact that the stub's compliance is determind, in part by
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32 configuration of the appropriate Exporter in the config file.
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33 */
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34 ProxyVerifier(BlitzServer aServer, Uuid aUuid) {
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35 if (! (aServer instanceof RemoteMethodControl))
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36 throw new UnsupportedOperationException("Server stub does not support RemoteMethodControl - wrong Exporter?");
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37
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38 if (! (aServer instanceof TrustEquivalence))
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39 throw new UnsupportedOperationException("Server stub does not support TrustEquivalance - wrong Exporter?");
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40
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41 theOriginalStub = (RemoteMethodControl) aServer;
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42 theOriginalUuid = aUuid;
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43 }
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44
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45 public boolean isTrustedObject(Object anObject,
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46 TrustVerifier.Context aContext)
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47 throws RemoteException {
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48
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49 RemoteMethodControl myOtherServer;
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50 Uuid myOtherUuid;
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51
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52 /*
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53 One might be tempted to implement all of this by having all proxies
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54 implement a particular interface and obtain the details like that
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55 but it opens the way to a "foreign" proxy implementing the interface
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56 and nothing else such that it passes all our tests but actually isn't
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57 our proxy - thus we test the concrete class.
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58 */
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59 if (anObject instanceof ConstrainableBlitzProxy) {
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60 ConstrainableBlitzProxy myProxy = (ConstrainableBlitzProxy)
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61 anObject;
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62
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63 myOtherServer = (RemoteMethodControl) myProxy.theStub;
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64 myOtherUuid = myProxy.theUuid;
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65 } else if (anObject instanceof ConstrainableTxnParticipantProxy) {
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66 ConstrainableTxnParticipantProxy myProxy =
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67 (ConstrainableTxnParticipantProxy) anObject;
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68
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69 myOtherServer = (RemoteMethodControl) myProxy.theStub;
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70 myOtherUuid = myProxy.theUuid;
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71 } else if (anObject instanceof ConstrainableAdminProxy) {
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72 ConstrainableAdminProxy myProxy =
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73 (ConstrainableAdminProxy) anObject;
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74
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75 myOtherServer = (RemoteMethodControl) myProxy.theStub;
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76 myOtherUuid = myProxy.theUuid;
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77 } else if (anObject instanceof ConstrainableLeaseImpl) {
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78 ConstrainableLeaseImpl myProxy =
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79 (ConstrainableLeaseImpl) anObject;
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80
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81 myOtherServer = (RemoteMethodControl) myProxy.theStub;
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82 myOtherUuid = myProxy.theUuid;
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83 } else if ((anObject instanceof BlitzServer) &&
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84 (anObject instanceof RemoteMethodControl)) {
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85 // Contributed services have this their code - might this be due
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86 // to Activation?
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87 myOtherServer = (RemoteMethodControl) anObject;
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88 myOtherUuid = theOriginalUuid;
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89 } else {
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90 // It's nothing we know about - fail it.
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91 return false;
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92 }
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93
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94 if (! theOriginalUuid.equals(myOtherUuid))
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95 return false;
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96
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97 // Get client constraints from passed proxy
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98 MethodConstraints myConstraints = myOtherServer.getConstraints();
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99
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100 // Create copy of original server stub with constraints applied
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101 TrustEquivalence myConstrainedStub =
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102 (TrustEquivalence) theOriginalStub.setConstraints(myConstraints);
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103
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104 return myConstrainedStub.checkTrustEquivalence(myOtherServer);
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105 }
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106
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107 /**
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108 We override this method to check that integrity of the Verifier has
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109 been maintained. There are a number of potential sources of compromise
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110 such as "fiddling" with the serialized steam or a "misbehaving" JVM
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111 implementation.
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112 */
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113 private void readObject(ObjectInputStream anOIS)
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114 throws IOException, ClassNotFoundException {
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115
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116 anOIS.defaultReadObject();
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117
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118 if ((theOriginalStub == null) || (theOriginalUuid == null)) {
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119 throw new InvalidObjectException("Internal state has been compromised");
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120 }
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121
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122 if (! (theOriginalStub instanceof TrustEquivalence))
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123 throw new InvalidObjectException("Stub doesn't implement TrustEquivalence");
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124 }
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125 }
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126
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127