AVC denial with bugzilla from epel
Paul Howarth
paul at city-fan.org
Wed Jan 23 14:12:50 UTC 2008
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
What's probably needed is for the bugzilla policy to have:
allow httpd_bugzilla_script_t httpd_tmp_t:dir manage_dir_perms;
allow httpd_bugzilla_script_t httpd_tmp_t:file manage_file_perms;
files_tmp_filetrans(httpd_bugzilla_script_t,httpd_bugzilla_script_rw_t,{
dir file lnk_file sock_file fifo_file })
This is in line with existing policy for httpd_sys_script_t I believe
(and what I'm using in the fastcgi policy in mod_fcgid-selinux). It
should be possible to use bugzilla without having httpd_unified set.
Paul.
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