rmid -J-Djava.security.policy=rmid.policy

*

starts the Activator and an internal registry on the default port, 1098, and

*

binds an ActivationSystem to the name java.rmi.activation.ActivationSystem in this internal registry.

    rmid -J-Djava.security.policy=rmid.policy -port 1099

*

default (or if this property is unspecified)

The default execPolicy allows rmid to execute commands with specific command-line options only if rmid has been granted permission to execute those commands and options in the security policy file that rmid uses. Only the default activation group implementation can be used with the default execution policy.

rmid launches a VM for an activation group using the information in the group's registered activation group descriptor, an ActivationGroupDesc. The group descriptor specifies an optional ActivationGroupDesc.CommandEnvironment which includes the command to execute to start the activation group as well as any command line options to be added to the command line. By default, rmid uses the java command found in java.home. The group descriptor also contains properties overrides that are added to the command line as options defined as:

    -D<property>=<value>

The permission com.sun.rmi.rmid.ExecPermission is used to grant rmid permission to execute a command, specified in the group descriptor's CommandEnvironment to launch an activation group. The permission com.sun.rmi.rmid.ExecOptionPermission is used to allow rmid to use command-line options, specified as properties overrides in the group descriptor or as options in the CommandEnvironment, when launching the activation group.

When granting rmid permission to execute various commands and options, the permissions ExecPermission and ExecOptionPermission need to be granted universally (i.e., granted to all code sources).

ExecPermission

The ExecPermission class represents permission for rmid to execute a specific command to launch an activation group.

Syntax
The name of an ExecPermission is the path name of a command to grant rmid permission to execute. A path name that ends in "/*" indicates all the files contained in that directory (where "/" is the file-separator character, File.separatorChar). A path name that ends with "/-" indicates all files and subdirectories contained in that directory (recursively). A path name consisting of the special token "<<ALL FILES>>" matches any file.

Note: A path name consisting of a single "*" indicates all the files in the current directory, while a path name consisting of a single "-" indicates all the files in the current directory and (recursively) all files and subdirectories contained in the current directory.

ExecOptionPermission

The ExecOptionPermission class represents permission for rmid to use a specific command-line option when launching an activation group. The name of an ExecOptionPermission is the value of a command line option.

Syntax
Options support a limited wildcard scheme. An asterisk signifies a wildcard match, and it may appear as the option name itself (i.e., it matches any option), or an asterisk may appear at the end of the option name only if the asterisk follows either a "." or "=".

For example: "*" or "-Dfoo.*" or "-Da.b.c=*" is valid, "*foo" or "-Da*b" or "ab*" is not.

Policy file for

rmid When granting rmid permission to execute various commands and options, the permissions ExecPermission and ExecOptionPermission need to be granted universally (i.e., granted to all code sources). It is safe to grant these permissions universally because only rmid checks these permissions.

An example policy file that grants various execute permissions to rmid is:

grant {


    permission com.sun.rmi.rmid.ExecPermission


        "/files/apps/java/jdk1.2.2/solaris/bin/java";


    permission com.sun.rmi.rmid.ExecPermission


        "/files/apps/java/jdk1.2.2/solaris/bin/java_g";


    permission com.sun.rmi.rmid.ExecPermission


        "/files/apps/rmidcmds/*";


    permission com.sun.rmi.rmid.ExecOptionPermission


        "-Djava.security.policy=/files/policies/group.policy";


    permission com.sun.rmi.rmid.ExecOptionPermission


        "-Djava.security.debug=*";


    permission com.sun.rmi.rmid.ExecOptionPermission


        "-Dsun.rmi.*";
};

The first two permissions granted allow rmid to execute the 1.2.2 version of the java and java_g commands, specified by their explicit path names. Note that by default, the version of the java command found in java.home is used (the same one that rmid uses), and does not need to be specified in the policy file. The third permission allows rmid to execute any command in the directory /files/apps/rmidcmds.

The fourth permission granted, an ExecOptionPermission, allows rmid to launch an activation group that defines the security policy file to be /files/policies/group.policy. The next permission allows the java.security.debug property to be used by an activation group. The last permission allows any property in the sun.rmi property name hierarchy to be used by activation groups.

To start rmid with a policy file, the java.security.policy property needs to be specified on rmid's command line, for example:

*

*

<policyClassName>

If the default behavior is not flexible enough, an administrator can provide, when starting rmid, the name of a class whose checkExecCommand method is executed in order to check commands to be executed by rmid.

The policyClassName specifies a public class with a public, no-argument constructor and an implementation of the following checkExecCommand method:

    public void checkExecCommand(ActivationGroupDesc desc,


                                 String[] command)


        throws SecurityException;

Before launching an activation group, rmid calls the policy's checkExecCommand method, passing it the activation group descriptor and an array containing the complete command to launch the activation group. If the checkExecCommand throws a SecurityException, rmid will not launch the activation group and an ActivationException will be thrown to the caller attempting to activate the object.

*

none

If the sun.rmi.activation.execPolicy property value is "none", then rmid will not perform any validation of commands to launch activation groups.