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Baked in Rules

Baked-in Rules

CommandBox has a few baked in rules that you can apply ad-hoc or as part of a server profile.

  • web.blockCFAdmin - Returns 404 error page for any Adobe CF or Lucee Server admin administrator paths
  • web.blockSensitivePaths - Returns 404 error page for common config files such as box.json or .env
  • web.blockFlashRemoting - Blocks all paths related to Flash and Flex remoting calls

{% hint style="success" %} If you want to customize the rules above, simply turn them off and include the rules directly in your server.json where you can modify them as you see fit. {% endhint %}

Block CF Admin

This setting has three possible settings:

  • true - Block ALL access to ColdFusion and Lucee admins
  • false - Do not block anything
  • external - Only block access not coming from localhost.

The exact rule activated when you set this property to true is:

block-cf-admin()

The exact rule activated when you set this property to external is:

cf-admin() -> block-external()

Block Sensitive Paths

This setting only allows true/false. This is a bit of a catch-all rule for any sort of paths that a user should never be able to make on production that could reveal information or access secret parts of your CF installation. When set to true, the following rules are activated:

// track and trace verbs can leak data in XSS attacks
disallowed-methods( methods={trace,track} )

// Common config files and sensitive paths that should never be accessed, even on development
regex( pattern='.*/(box.json|server.json|web.config|urlrewrite.xml|package.json|package-lock.json|Gulpfile.js)', case-sensitive=false ) -> set-error(404)

// Any file or folder starting with a period
regex('/\.')-> set-error( 404 )

// Additional serlvlet mappings in Adobe CF's web.xml
path-prefix( { '/JSDebugServlet','/securityanalyzer','/WSRPProducer' } ) -> set-error( 404 )

// java web service (Axis) files
regex( pattern='\.jws$', case-sensitive=false ) -> set-error( 404 )

When the profile is set to production, the following rule is also added which blocks the ColdFusion RDS access from CF Builder and access to TestBox runners:

regex( pattern='.*/(CFIDE/multiservermonitor-access-policy.xml|CFIDE/probe.cfm|CFIDE/main/ide.cfm|tests/runner.cfm|testbox/system/runners/HTMLRunner.cfm)', case-sensitive=false ) -> set-error(404)

If you need to legitimately access any of these paths, you'll need to turn off this setting and custom-add the rules that you want to keep. This setting is a convenience that adds several rules at once.

Block Flash Remoting

This setting only allows true/false. When set to true, the following rules are activated:

// These all map to web.xml servlet mappings for ACF
path-prefix( { '/flex2gateway','/flex-internal','/flashservices/gateway','/cfform-internal','/CFFormGateway' } ) -> set-error( 404 )

// Files used for flash remoting
regex( pattern='\.(mxml|cfswf)$', case-sensitive=false ) -> set-error( 404 )

If you need to legitimately access any of these paths, you'll need to turn off this setting and custom-add the rules that you want to keep. This setting is a convenience that adds several rules at once.

Override just part of a baked-in rule

What if you want to go one step deeper? For instance, the blockSensitivePaths setting blocks a whole bunch of stuff all in one shot. An example might be wanting to open up JUST the RDS IDE integration for your developers, which funnels through the /CFIDE/main/ide.cfm path which you can see is blocked above.

The solution to this is quite simple and is all based on the ORDER in which your rules are processed. Built-in CommandBox rules are the last to process. This means that if you hijack the predicates with a custom rule FIRST, you can override the behavior of the built in rules. So, if we want to allow access to the /CFIDE/main/ide.cfm path, we just need to add a custom rule that matches that path and then aborts the predicate chain so no further rules fire.

server set web.rules="['path(/CFIDE/main/ide.cfm)->done']" --append

Which gives you the following server.json

{
    "web":{
        "rules":[
            "path(/CFIDE/main/ide.cfm)->done"
        ]
    }
}

The done handler is what bypasses all subsequent rules for the request.

{% hint style="danger" %} Since your custom rules are processed BEFORE the built-in rules, that also means that you have the ability to accidentally bypass security rules by applying another rule that intercepts the request! By default a custom rule won't block subsequent rules from firing unless you rewrite the request or use the special done handler. {% endhint %}