Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/remote/ProxyVerifier.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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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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Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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117 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
118 if ((theOriginalStub == null) || (theOriginalUuid == null)) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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119 throw new InvalidObjectException("Internal state has been compromised"); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
120 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
121 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
122 if (! (theOriginalStub instanceof TrustEquivalence)) |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
123 throw new InvalidObjectException("Stub doesn't implement TrustEquivalence"); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
124 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
125 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
126 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
127 |