AVC denial with bugzilla from epel

Tony Molloy tony.molloy at ul.ie
Thu Jan 24 18:44:53 UTC 2008


On Thursday 24 January 2008 15:28:42 Daniel J Walsh wrote:
> Paul Howarth wrote:
> > Rahul Sundaram wrote:
> >> Tony Molloy wrote:
> >>> Hi,
> >>>
> >>> I'm installing bugzilla from epel-5 onto a Centos-5 Server. I'm
> >>> getting the following AVC denied message:
> >>>
> >>> Summary
> >>>     SELinux prevented httpd reading and writing access to http files.
> >>>
> >>> Detailed Description
> >>>     SELinux prevented httpd reading and writing access to http files.
> >>> Ordinarily
> >>>     httpd is allowed full access to all files labeled with http file
> >>> context.
> >>>     This machine has a tightened security policy with the
> >>> httpd_unified turned
> >>>     off,  This requires explicit labeling of all files.  If a file is
> >>> a cgi
> >>>     script it needs to be labeled with httpd_TYPE_script_exec_t in
> >>> order to be
> >>>     executed.  If it is read only content, it needs to be labeled
> >>>     httpd_TYPE_content_t, it is writable content. it needs to be
> >>> labeled httpd_TYPE_script_rw_t or httpd_TYPE_script_ra_t. You can use
> >>> the chcon
> >>>     command to change these context.  Please refer to the man page "man
> >>>     httpd_selinux" or
> >>> http://fedora.redhat.com/docs/selinux-apache-fc3 "TYPE"
> >>>     refers toi one of "sys", "user" or "staff" or potentially other
> >>> script
> >>>     types.
> >>>
> >>> Allowing Access
> >>>     Changing the "httpd_unified" boolean to true will allow this
> >>> access: "setsebool -P httpd_unified=1"
> >>>
> >>>     The following command will allow this access:
> >>>     setsebool -P httpd_unified=1
> >>>
> >>> Additional Information       Source Context
> >>> root:system_r:httpd_bugzilla_script_t
> >>> Target Context                root:object_r:httpd_tmp_t
> >>> Target Objects                /tmp/.NSPR-AFM-6806-97520c8.0 (deleted)
> >>> [ file ]
> >>> Affected RPM Packages         Policy RPM
> >>> selinux-policy-2.4.6-106.el5_1.3
> >>> Selinux Enabled               True
> >>> Policy Type                   targeted
> >>> MLS Enabled                   True
> >>> Enforcing Mode                Enforcing
> >>> Plugin Name                   plugins.httpd_unified
> >>> Host Name                     richmond.csis.ul.ie
> >>> Platform                      Linux richmond.csis.ul.ie
> >>> 2.6.18-53.1.4.el5 #1 SMP
> >>>                               Fri Nov 30 00:45:16 EST 2007 i686 i686
> >>> Alert Count                   21
> >>> Line Numbers
> >>> Raw Audit Messages           avc: denied { read, write } for
> >>> comm="index.cgi" dev=sda6 egid=48 euid=48
> >>> exe="/usr/bin/perl" exit=0 fsgid=48 fsuid=48 gid=48 items=0
> >>> path=2F746D702F2E4E5
> >>> 350522D41464D2D363830362D393735323063382E30202864656C6574656429
> >>> pid=12090
> >>> scontext=root:system_r:httpd_bugzilla_script_t:s0 sgid=48
> >>> subj=root:system_r:httpd_bugzilla_script_t:s0 suid=48 tclass=file
> >>> tcontext=root:object_r:httpd_tmp_t:s0 tty=(none) uid=48
> >>>
> >>> This seems to a denial to r/w a file in /tmp
> >>>
> >>> I can generate a local policy to allow this access with audit2allow
> >>> but what is the correct way to handle this.
> >>
> >> The answer was within the report itself
> >>
> >> #  setsebool -P httpd_unified=1
> >

>Who is creating the httpd_tmp_t files?  Is this a cgi that should be
>labeled httpd_bugzilla_script_t.

Several perl cgi scripts create tmp files.

>From the above it's index.cgi. The permissions on all these scripts are the 
same.

-rwxr-x---  root apache system_u:object_r:httpd_bugzilla_script_exec_t 
index.cgi

I created a local policy and bugzilla is working. I also submitted this as  
bug 429879 to bugzilla.


Thanks,

Tony






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