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CHAPTER 22 ADVANCED SECURITY
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null ) ), new Permission[] {} ); } And the server configuration is config/security/jeri-ssl-conf.config: import java.security.Permission; import net.jini.constraint.BasicMethodConstraints; import net.jini.core.constraint.InvocationConstraint; import net.jini.core.constraint.InvocationConstraints; import net.jini.core.constraint.Confidentiality; import net.jini.jeri.*; import net.jini.jeri.ssl.*; security.FileClassifierServer { /* class name for the service */ serviceName = "rmi.FileClassifierImpl"; /* Exporter for the server proxy */ exporter = /* Use secure exporter */ new BasicJeriExporter( /* Use SSL transport */ SslServerEndpoint.getInstance(0), new BasicILFactory( /* Require confidentiality for all methods */ new BasicMethodConstraints( new InvocationConstraints(Confidentiality.YES, null)), /* No Permission */ null ) ); } These configurations can be run as follows: java ... client.TestFileClassifierProxyPreparer \ config/security/preparer-trust-integrity.config java ... -Djava.rmi.server.codebase=httpmd://... \ security.FileClassiferServer \ config/security/jeri-ssl-conf.config They can be run from Ant as follows: ant run -DrunFile=client.TestFileClassifierProxyPreparer \ -Dconfig=config/security/preparer-trust-integrity.config ant run -DrunFile=security.FileClassiferServer \ -Dconfig=config/security/jeri-ssl-.config \ -Ddo.trust=yes
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CHAPTER 22 ADVANCED SECURITY
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This combination works satisfactorily. The client logs are indicative of what has happened. The trust logger shows the following (with much text elided): FINE: FINE: FINE: FINE: FINE: FINE: HttpmdIntegrityVerifier verifies httpmd://... trust verifiers [...] SslTrustVerifier trusts SslEndpoint[...] BasicJeriTrustVerifier trusts BasicObjectEndpoint[...] ConstraintTrustVerifier trusts Confidentiality.YES ConstraintTrustVerifier trusts InvocationConstraints[reqs: {Confidentiality.YES}, prefs: {}] FINE: ConstraintTrustVerifier trusts BasicMethodConstraints{default => InvocationConstraints[reqs: {Confidentiality.YES}, prefs: {}]} FINE: BasicJeriTrustVerifier trusts Proxy[...] This code shows that the HttpmdIntegrityVerifier trusts the HTTPMD URL; the SslTrustVerifier trusts the SslEndpoint; the ConstraintTrustVerifier trusts Confidentiality, and hence the ConstraintTrustVerifier trusts the BasicMethodConstraints; and so on, until finally, the BasicJeriTrustVerifier trusts the proxy. Similarly, the integrity log shows this: FINE: integrity verifiers [...] FINE: HttpmdIntegrityVerifier verifies httpmd://... The HttpmdIntegrityVerifier verifies the HTTPMD URL. By way of contrast, if the client is run with one constraint, and the server is run with its opposite, then the constraints cannot be satisfied. For example, if the client has set Confidentiality.NO and the server has set Confidentiality.YES, then the client will throw an exception: java.rmi.ConnectIOException: I/O exception connecting to BasicObjectEndpoint[...,SslEndpoint[...]]; nested exception is: net.jini.io.UnsupportedConstraintException: Constraints not supported: InvocationConstraints[reqs: {Confidentiality.NO, Confidentiality.YES}, prefs: {}]
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Identity Management
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If you want to give different individuals different access rights, then you need to be able to verify each individual s identity. This means that they must have some way of expressing what their identity is in a form that you will recognize. People (and things) may have a number of identities: the father of a particular person, staff ID number, driver s license number, name, and so on. Essentially, these are different labels for one entity. The terminology adopted is that the entity is called a subject, and in Java this is represented by the Subject class in the javax.security.auth package. The different identities for a subject are called principals, and they too have a Java class: Principal. A subject authenticates itself to a service using a principal and information to verify itself as that principal. For example, you log into a computer using your user name as principal and
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CHAPTER 22 ADVANCED SECURITY
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password for verification, but other mechanisms could be used. A credential is used to authenticate a subject to later services. In the computer world, these include X.509 certificates and Kerberos tickets. In this section, we ll look at how Jini clients and services can have and demonstrate their identity.
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Java Authentication and Authorization Service (JAAS)
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A white paper describing JAAS is titled User Authentication and Authorization in the Java Platform and can be found at https://java.sun.com/javase/6/docs/technotes/guides/ security/jaas/acsac.html. For further information also see the Java Authentication and Authorization Service (JAAS) Reference Guide, which should be in the Java distribution directory docs/guide/security/jaas/JAASRefGuide.html, and JAAS Authentication at http:// java.sun.com/j2se/1.4.2/docs/guide/security/jgss/tutorials/AcnOnly.html. JAAS is a framework for verifying common identities, including the following: Java Naming and Directory Interface (JNDI) Keystore Kerberos Windows NT Unix Information on these can be found at http://java.sun.com/j2se/1.4.2/docs/guide/ security/jgss/tutorials/LoginConfigFile.html. JAAS augments the standard Java security model by adding support for principals, so security access is granted not only on the properties of the code itself (signed, etc.), but also on the principals running the code. To use JAAS, you first need to create a LoginContext. This picks up information from a configuration file to decide which principal it is authenticating as, and how to do it. The configuration file is similar in concept to the Jini configuration files, but the syntax is different and the contents depend upon the mechanism used. Once you have a context, you attempt to login(). If successful, you are then a recognized entity and a subject with identity. As a subject, you may be able to do more things than if you have no identity. For example, in an SSL interaction, you will be able to present certificates for this identity if required. And the situation is similar with Kerberos: if challenged, you have an identity and a ticket credential to prove it. You then add the JAAS security checks to code by running it as the privileged subject, like so: LoginContext loginContext = new LoginContext("..."); if (loginContext == null) { // do some action without JAAS security } else { loginContext.login(); Subject.doAsPrivileged( loginContext.getSubject(),
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