Building an activatable server in Java

Print Code 39 in Java Building an activatable server
107 Building an activatable server
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This process is no different from the process of compiling a non activatable server, described in 77
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108 Run-time setup
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The only run time setup required for activatable servers is to ensure that the activation daemon rmid is running, and perhaps to bind the activatable stub(s) into the RMI registry You can accomplish the latter by a variant of the registry load program described in 6 1081 Codebase and activat ion You must specify a codebase at least once, perhaps twice, when setting up activatable servers:
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when registering activatable servers with the activation system, so that it can create instances of activatable servers when binding an activatable server into the registry, if you use this technique, so that the registry will locate the stub classes correctly
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These actions occur at different phases of execution, so the codebase may have to be specified twice 1082 rmid security policy JDK 13 Activatable RMI systems which worked under JDK 122 do not work unchanged under JDK 13 Lurking deep in the "Summary of New Features and Enhancements" for JDK 13 is the harmless looking statement "rmid now requires a security policy file" This change was introduced because the ActivationGroupDesc structure provides the ability to register and activate an arbitrary executable, not just a Java program Obviously this constitutes a security hole Prior to JDK 13 (actually prior to JDK 122_006), this was addressed by the restriction that activatables can only be registered from programs running in the same host as the activation daemon, and the assumption that unprivileged code is unable to connect to port 1098 A stronger and more fine grained security model was required To satisfy the new activation security semantics from JDK 13 onwards, you must specify one of the following in the command line for rmid:
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no security, by starting rmid with the command line argument -JDsunrmiactivationexecPolicy = none; this replicates the JDK 12 behaviour (not recommended, except for temporary development situations) a security policy file, by starting rmid with the command line argument -JDjavasecuritypolicy = file, where file is the name of an rmid policy file as described in the JDK documentation for rmid an alternate security policy, by starting rmid with the command line argument -JDsunrmiactivationexecPolicy = classname, where class name is the name of an alternate rmid policy class as described in the JDK documentation for rmid
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If you don't specify one of the above security solutions to rmid, or if the security solution doesn't grant all the required permissions, attempts to use activatable stubs in clients will fail with the exception javasecurityAccessControlException for a missing ExecPermission or ExecOptionPermission Note that AccessControlException extends SecurityException which in turn extends RuntimeException, so this exception will only be caught if there is a handler in the client for one of those exceptions During development, specifying an activation execPolicy of none may be used as a stopgap In production, you normally would supply an rmid policy file This must contain entries granting ExecPermissions for all the executables used by the activation daemon, normally just java (and perhaps java_g during development), and ExecOptionPermissions for all the system properties you have specified when defining activation groups, including the javasecuritypolicy file for the group The rmid security policy file of Example 102 can be used as a starting point
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Example 102 Activation security policy file
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// Security policy file for rmid (activation daemon) grant { // permission to execute the specified program(s) permission comsunrmirmidExecPermission "d:\\jdk13\\bin\\java"; // adjust to suit your installation permission comsunrmirmidExecPermission "d:\\jdk13\\bin\\java_g"; // adjust to suit your installation // permission to set the specified file as the security policy file for the group permission comsunrmirmidExecOptionPermission "-Djavasecuritypolicy=d:\\projects\\RMIBook\\rmidgrouppolicy"; // permission to set the following properties permission comsunrmirmidExecOptionPermission "-Djavasecuritydebug=*"; permission comsunrmirmidExecOptionPermission "-Djavarmi*"; permission comsunrmirmidExecOptionPermission "-Dsunrmi*"; };
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The file supports a wild card syntax as shown Sadly, the Java policytool doesn't yet know about ExecPermission and ExecOptionPermission, but you can type in the permission names yourself, so you can still use this tool to manage the file See the JDK documentation for rmid for further information
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