[Users] 3.3 Nightly Built July 31st: Still problems with gwt.rpc

[Vojtech Szocs]

Hi,

the problem here was following:

- GWT RPC requests include X-GWT-* headers to provide additional meta-data, i.e. [X-GWT-Module-Base: https://whatever/webadmin/webadmin/]
- when processing GWT RPC request, server (RpcServlet) gets X-GWT-Module-Base value and compares it with current request's context path
- if comparison fails, for example due to extra leading [/ovirt-engine] path element, it blocks the request as invalid (potential XSRF attack)

Vojtech


----- Original Message -----
> From: "Hans-Joachim" <rni at chef.net>
> To: "Juan Hernandez" <jhernand at redhat.com>
> Cc: users at ovirt.org
> Sent: Thursday, August 1, 2013 1:54:55 PM
> Subject: Re: [Users] 3.3 Nightly Built July 31st: Still problems with gwt.rpc
> 
> Hello,
> 
> thank you... solved....
> 
> Hans-Joachim
> 
> 
> 
> 
> 
> ----- Original Message -----
> 
> From: Juan Hernandez
> 
> Sent: 08/01/13 12:58 PM
> 
> To: Hans-Joachim
> 
> Subject: Re: [Users] 3.3 Nightly Built July 31st: Still problems with gwt.rpc
> On 08/01/2013 10:48 AM, Hans-Joachim wrote:
> > Hello,
> > 
> > I'm just installing 3.3 Nightly as of July 31st on my CentOS 6.4 server.
> > 
> > When I try to login to the Web I got 'Error 500'
> > 
> > Here the part of server.log
> > 
> > ......
> > 2013-08-01 10:40:05,098 ERROR
> > [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/webadmin]]
> > (ajp--127.0.0.1-8702-6) Exception while dispatching incoming RPC call:
> > java.lang.SecurityException: Blocked request without GWT base path
> > header (XSRF attack?)
> >          at
> > com.google.gwt.rpc.server.RpcServlet.getClientOracle(RpcServlet.java:95)
> > [gwt-servlet.jar:]
> >          at
> > com.google.gwt.rpc.server.RpcServlet.processPost(RpcServlet.java:205)
> > [gwt-servlet.jar:]
> >          at
> > com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
> > [gwt-servlet.jar:]
> >          at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
> > [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
> > .......
> > 
> > Hans-Joachim
> > 
> 
> Actually this isn't a problem with GWT RPC, but with the redirection
> that is performed from / to /ovirt-engine in the web server. You
> probably ended up with the following URL:
> 
> https://whatever/ovirt-engine/webadmin/webadmin/WebAdmin.html
> 
> This adds an extra "ovirt-engine" path element to the request, that the
> server side doesn't expect, so it assumes that there is a XSFR attach
> going on. Type an URL like this manually in the browser and it should work:
> 
> https://whatever/webadmin/webadmin/WebAdmin.html
> 
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> 
> 
> 
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