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2 Both client and server sockets can access the underlying SSL session This facility can be used to maintain session state, or to terminate an entire SSL session forcing the other end to re authenticate itself on the next use of the connection
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166 LDAP authentication
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It is possible to set up LDAP directories to require authentication before a client can access them This can be used as a broadly based form of access control to RMI servers If the initial server to be looked up is in a directory requiring client authentication, that client is implicitly authenticated to all RMI servers reachable from that server This technique is usually used in J2EE (Enterprise Edition) based applications Consult the JNDI documentation for the LDAP provider for further information
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167 JAAS
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The Java Authentication and Authorization Service (JAAS) architecture, introduced to supplement Java 2 JDK 13, addresses the issues of authentication and authorization, providing a common framework into which various kinds of security policies and implementations can be integrated The JAAS framework provides for:
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establishing and verifying a user's identity performing security provider defined logins temporarily assuming an acquired identity, to perform an action on behalf of another
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168 RMI Security Extension
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The RMI Security Extension specifies a security layer for RMI,[5] built on top of the JAAS architecture It addresses all four of the proposed security issues of this chapter: authentication, authorization, integrity, and privacy, and adds the further facility of delegation: a client may delegate its identity (its JAAS subject) to the server, allowing the server to securely impersonate the client while performing local or remote activity on its behalf
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The RMI Security Extension is aimed not only at RMI, but also at all kinds of remote object access involving client access via a proxy (Remember that in RMI, client access is via a remote stub, which is a proxy to the remote service) Most notably this includes Jini At the time of writing, the specification was still provisional, and no implementation was available for experimentation Our discussion is limited to describing the major concepts of the RMI Security Extension: we do not discuss specifics of the API, which are subject to change between the draft and eventual release We have not verified or tested any of the features described
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1681 Security constraints The RMI Security Extension is based on the concept of security constraints: requirements or preferences expressed by clients and servers about the security level of a specific RMI conversation as a whole, or about one or more individual remote methods in the conversation Constraints supported by the RMI Security Extension include:
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conversational integrity (YES or NO) conversational confidentiality (YES or NO) authenticate the client (YES or NO) authenticate the server (YES or NO) delegate the client identity to the server (YES or NO) time limits on the duration of any delegation minimal and maximal sets of principals as which the client must authenticate itself, if it does so at all, and associated principal types (implementation classes) minimal sets of principals as which the server must authenticate itself, if it does so at all
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The client and server constraints are aggregated Required constraints override preferred constraints; when two preferred constraints conflict, it is arbitrary which one is retained The resulting set of constraints is used to select an endpoint factory for the conversation or an individual method call: a factory will be chosen which supports all the constraints in the aggregated set (An endpoint is an abstraction of a ServerSocket; a client endpoint is an abstraction of a Socket; and an endpoint factory is an abstraction of a socket factory These concepts are intended to remove explicit dependencies on TCP/IP) 1682 Secure servers The Security Extension introduces two helper classes for writing secure unicast servers and secure activatable servers An RMI server can be exported as a secure server by calling an exportObject method provided by one of these classes Both classes provide corresponding unexportObject methods A secure server has four new features:
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it has zero or more default security constraints and/or per method security constraints, as described above it exports a secure stub (secure proxy) it can obtain an authenticated "client subject" specification for a current remote call it can implement call access control
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1683 Secure stub When a secure server is exported, a "secure export descriptor" object can be provided This object defines, inter alia, the default constraints and method specific constraints, if any, for the server These
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method constraints are also made available as the "server constraints" of the secure stub exported by the server If none are available, the default constraints are used The secure export descriptor object may also contain an array of endpoint factories, each of which is associated with a set of supported constraints This array indirectly associates endpoint factories, via constraints, with methods, so that some methods may be unconstrained while others can only be executed via a sufficiently constrained endpoint factory Some of this information is exported via the secure stub, so that the client can automatically be supplied with an appropriately secure client endpoint factory for each method call In this way, different methods in a remote object can be defined to require different levels of connection security, which may lead to different endpoint factories being employed for each method 1684 Client subject A secure server can obtain its client's subject If the client was not authenticated, the result is null, otherwise a javaxsecurityauthSubject is returned This can be used by the server in a number of ways, of which perhaps the most significant is "secure impersonation" or delegation The client can delegate to the server the authority to impersonate it by means of a delegation constraint A server operating under a delegation constraint can choose to securely impersonate that client when performing outbound secure calls, or receiving other inbound secure calls, by means of the SubjectdoAs operation The server can also obtain the security constraints for the current remote call 1685 Remote call control The Extension supports pre and post invocation access control, and control over parameter unmarshalling and return value marshalling 1686 Activatable secure servers An activatable secure server has all the new features defined above In addition, when exported, it defines a set of security constraints for the activator to apply when checking client access prior to activating the object, and it may declare that it implements an interface for activator security 1687 Secure clients A secure client is one which receives a secure stub it is a client of a secure server A secure stub implements an interface which lets the client get the server constraints, and to get and set the client constraints A client may operate under the client constraints supplied by the server in the secure stub, or it may replace them with its own 1688 Secure clients of activa table secure servers If the secure server is activatable, an additional step occurs at the client, to ensure that the activator constraints of the server and its client security constraints can both be obtained without an exception being thrown, and that they are the same This process establishes mutual trust, first between client and the Activator, then between the Activator and server, thus transitively establishing trust
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between client and server:
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