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Re: [equinox-dev] security exceptions using Felix config admin withEquinox

I'm not using anyPermission Admin Service; the SecurityManager is set using:

if (System.getSecurityManager() == null) {
    System.setSecurityManager(new SecurityManager());
}

with the java.security.policy System property pointing to the security policy file.

I guess if I switched to using Conditional Permission Admin instead, then this problem wouldnât occur,
because the Equinox ProtectionDomain would be constructed with explicit Permissions from Permission Admin?


I only set a Security Manager, because it is required by RMI; I have not defined a fine-grained security policy - it grants AllPermission,
so I donât really want to run and configure Permission Admin just to make this work on Equinox.

Iâm also exploring using the Equinox config admin, as this doesnât create a new AccessControlContext using the classes ProtectionDomain,
so avoids the issue.

BJâs suggestion of changing Felix config admin to use the one-arg doPrivileged() method seems reasonable and would also resolve the issue.

â
Derek



On 19 May 2016, at 13:52, Thomas Watson <tjwatson@xxxxxxxxxx> wrote:

When you say security policy, I assume you mean the one you set through one of the framework's permission admin service?  And how are you setting the security manager?

Tom





From:        Derek Baum <derek@xxxxxxxxxxxx>
To:        equinox-dev@xxxxxxxxxxx
Date:        05/18/2016 02:16 PM
Subject:        Re: [equinox-dev] security exceptions using Felix config admin with        Equinox
Sent by:        equinox-dev-bounces@xxxxxxxxxxx




Hi,

Iâve also posted this to the Felix dev list, as the problem occurs when using Felix config admin with Equinox runtime.

Iâm using org.eclipse.osgi_3.10.101.v20150820-1432.jar

Thanks,

â
Derek


On 18 May 2016, at 18:58, Derek Baum <derek@xxxxxxxxxxxx> wrote:

Iâm running with a SecurityManager installed and a trivial security.policy that grants AllPermission.

This works fine when running using the Felix runtime; however when I switch to Equinox I get security exceptions.

Iâm not yet sure whether the problem lies with Felix config admin (1.8.8), Equinox runtime or elsewhere.


Iâve diagnosed the cause of the failure as follows:

Felix config admin ManagedServiceTracker, uses doPrivileged() to invoke the service.updated() method, with a new AccessControlContext:

      AccessController.doPrivileged(new PrivilegedExceptionAction() {
               public Object run() throws ConfigurationException {
                   service.updated( properties );
                   return null;
               }
            }, getAccessControlContext( service ) );

    AccessControlContext getAccessControlContext( final Object ref ) {
        return new AccessControlContext( new ProtectionDomain[]
            { ref.getClass().getProtectionDomain() } );
    }


Felix and Equinox return different ProtectionDomain implementations:

org.apache.felix.framework.BundleProtectionDomain
org.eclipse.osgi.internal.loader.ModuleClassLoader$GenerationProtectionDomain


Both implementations extend ProtectionDomain, but the Felix implementation uses the 4-arg constructor:

     The permissions granted to this domain are dynamic; they include
    both the static permissions passed to this constructor, and any
    permissions granted to this domain by the current Policy at the

     time a permission is checked.

while the Equinox implementation uses the 2-arg constructor.

    The only permissions granted to this domain
    are the ones specified; the current Policy will not be consulted


So the problem arises because Felix config admin is using doPrivileged() with a new AccessControlContext(), constructed using the target classes ProtectionDomain, and the ProtectionDomain returned when running on Equinox, does not consult the current policy, so my security policy containing grant AllPermission is ignored.


Iâve taken a quick look at the Equinox config admin implementation, and it doesnât use doPrivileged() or a new AccessControlContext(),
so the issue does not arise.


Any opinions on whether this issue lies in Felix config admin, Equinox framework, or elsewhere?


Thanks,

â
Derek









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