Need help to whitelist URI's

k20 · ‎04-Dec-2020

I need some help with the iRule. The goal is to allow users to access a limited number of URI's from the Internet but open to all for internal users.

I have created a datagroup that contains the internal subnets called internal_subnets

Here's my iRule

when HTTP_REQUEST {

if { [class match [IP::client_addr] equals internal_subnets] }{

pool app_80_pool

}

switch -glob [HTTP::host] {

"app.com" {

pool app_80_pool

}

if {[HTTP::uri] starts_with "/foo/combined.js*" or \

[HTTP::uri] starts_with "/foo/css/*" or \

[HTTP::uri] starts_with "/foo/desktopreset" or \

[HTTP::uri] starts_with "/foo/doc/*" or \

[HTTP::uri] starts_with "/foo/error404.html" or \

[HTTP::uri] starts_with "/foo/external/*" or \

[HTTP::uri] starts_with "/foo/favicon.ico" or \

[HTTP::uri] starts_with "/foo/home.jsf" or \

[HTTP::uri] starts_with "/foo/images/*" or \

[HTTP::uri] starts_with "/foo/include/*" or \

[HTTP::uri] starts_with "/foo/javax.faces.resource/*" or \

[HTTP::uri] starts_with "/foo/login.jsf" or \

[HTTP::uri] starts_with "/foo/resources/*" or \

[HTTP::uri] starts_with "/foo/scripts/*" or \

[HTTP::uri] starts_with "/foo/ui/*" or \

[HTTP::uri] starts_with "/foo/user/*" }{

pool app_80_pool

}

else {

HTTP::redirect "http://app.com/sorry.html"

}

Nothing works. What did I do wrong here?

Any help would be appreciated.

Enes_Afsin_Al · ‎04-Dec-2020

Hi k20,

Can you try this iRule?

when HTTP_REQUEST {
	if { [class match [IP::client_addr] equals internal_subnets] } {
		pool app_80_pool
	}
	else {
		switch -glob [HTTP::uri] {
			"/foo/combined.js*" -
			"/foo/css/*" -
			"/foo/desktopreset" -
			"/foo/doc/*" -
			"/foo/error404.html" -
			"/foo/external/*" -
			"/foo/favicon.ico" -
			"/foo/home.jsf" -
			"/foo/images/*" -
			"/foo/include/*" -
			"/foo/javax.faces.resource/*" -
			"/foo/login.jsf" -
			"/foo/resources/*" -
			"/foo/scripts/*" -
			"/foo/ui/*" -
			"/foo/user/*" -
			"/sorry.html" { pool app_80_pool }
			default { HTTP::redirect "http://app.com/sorry.html" }
		}
	}
}

k20 · ‎04-Dec-2020

Just tried your suggestion. However, when I go to the http://app.com it takes me to the sorry.html which is not what I want.

Enes_Afsin_Al · ‎04-Dec-2020

If you want external network clients access to app.com/*

when HTTP_REQUEST {
	if { [class match [IP::client_addr] equals internal_subnets] || [HTTP::host] equals "app.com" } {
		pool app_80_pool
	}
	else {
		switch -glob [HTTP::uri] {
			"/foo/combined.js*" -
			"/foo/css/*" -
			"/foo/desktopreset" -
			"/foo/doc/*" -
			"/foo/error404.html" -
			"/foo/external/*" -
			"/foo/favicon.ico" -
			"/foo/home.jsf" -
			"/foo/images/*" -
			"/foo/include/*" -
			"/foo/javax.faces.resource/*" -
			"/foo/login.jsf" -
			"/foo/resources/*" -
			"/foo/scripts/*" -
			"/foo/ui/*" -
			"/foo/user/*" { pool app_80_pool }
			default { HTTP::redirect "http://app.com/sorry.html" }
		}
	}
}

p

k20 · ‎04-Dec-2020

OK now external users can get to http://app.com which is great. However, when I type some random URI's other then the ones listed in the iRule such as:

http://app.com/<some_random_string>

it doesn't redirect to the sorry.html page. I want it to redirect to the sorry.html page if nothing else matches all of the conditions above (i.e. the internal subnets, the homepage and all URI's in that whitelist).

Enes_Afsin_Al · ‎04-Dec-2020

In below rule, you may need more uri for switch list. for example "index.php".

You should add them in switch func.

when HTTP_REQUEST {
	if { [class match [IP::client_addr] equals internal_subnets] } {
		pool app_80_pool
	}
	else {
		switch -glob [HTTP::uri] {
			"/" -
			"/sorry.html" -
			"/foo/combined.js*" -
			"/foo/css/*" -
			"/foo/desktopreset" -
			"/foo/doc/*" -
			"/foo/error404.html" -
			"/foo/external/*" -
			"/foo/favicon.ico" -
			"/foo/home.jsf" -
			"/foo/images/*" -
			"/foo/include/*" -
			"/foo/javax.faces.resource/*" -
			"/foo/login.jsf" -
			"/foo/resources/*" -
			"/foo/scripts/*" -
			"/foo/ui/*" -
			"/foo/user/*" { pool app_80_pool }
			default { HTTP::redirect "http://app.com/sorry.html" }
		}
	}
}

k20 · ‎04-Dec-2020

This new switch "/" - seems to break everything. The list of URI's above is inclusive. There shouldn't be any more to add.

Samir · ‎04-Dec-2020

Above iRule is correct, You can remove the statement which is creating issue.

If i will be at you place then can try negative scenario and short irule for fun. You can try to use URI_DB class to add and remove the URI.

when HTTP_REQUEST {
if { !([class match [IP::client_addr] equals internal_subnets]) && ([class match [HTTP::uri] starts_with URI_DB) } {
HTTP::redirect "http://app.com/sorry.html"
        }
else {
	pool app_80_pool 
	}
}

Add the all uri in URI_DB

"/sorry.html"

"/foo/combined.js*"

"/foo/css/*"

"/foo/desktopreset"

Please tune iRule per requirements.

Thanks

k20 · ‎05-Dec-2020

I really appreciate your suggestion. If I understand your iRule correctly, our external users will be having trouble getting to those specific URI's inside the URI_DB, which is not what I want. Let me try to explain my end game here.

There will be no restrictions to access the app for internal users whatsoever. We use source IP addresses to identify them.
External users can only have access to a small subset of the app with some restrictions. They will be allowed to access only the URI's defined under the "switch -glob" inside the iRule (i.e. those /foo/....URI's you see in the original post) and they are also allowed access the main page "app.com"
Finally, if the external users try to access stuff that are not allowed, we want to send them to the sorry.html page.

This is essentially like if you're inside my house, you can use whatever stuff you want. If you're outside, you can only use my bucket and shovel. If you try to borrow something else, I'm sorry. 🙂

I couldn't get the last condition to work.

k20 · ‎05-Dec-2020

Hey @Samir I think you have a good point. Looks like I misread your iRule. It seems to match my goal. Let me try that and will let you know how it goes. Wish me luck.

k20 · ‎05-Dec-2020

Just tried it and no luck. If I go to the home page app.com, it redirects me to the sorry.html. By the way, your script is missing the square bracket at the end of the URI_DB. It seems like an easy one. Oh boy, I couldn't get it to work.

.

k20 · ‎05-Dec-2020

I have reversed the logic back to the original but now using datagroup instead of the "switch -glob" meaning,

when HTTP_REQUEST {

if { [class match [IP::client_addr] equals internal_subnets] || [class match [HTTP::uri] starts_with URI_DB] || [HTTP::host] equals "app.com"} {

pool app_80_pool

}

else {

HTTP::redirect "http://app.com/sorry.html"

}

Now, everything works except the redirect which never works. However, I have just noticed that if I don't use DNS and use IP instead, the redirect works just fine. Can you explain why?

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Need help to whitelist URI's

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