List of domains & types

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My exim config needs to speak to MySQL (for greylisting). 

To allow this to work I needed to run:

    setsebool -P exim_can_connect_db 1

And that seems to do the trick.
Now sealert tells me:

    SELinux is preventing /usr/sbin/exim from getattr access on the file /usr/share/mysql/charsets/Index.xml.

    If you want to allow exim to have getattr access on the Index.xml file
    Then you need to change the label on /usr/share/mysql/charsets/Index.xml
    Do
    # semanage fcontext -a -t FILE_TYPE '/usr/share/mysql/charsets/Index.xml'

It then lists a whole set of suggested types.

The label on /usr/share/mysql/charsets/Index.xml is system_u:object_r:usr_t:s0

I picked exim_t (which seemed reasonable - just on the name). But when I try I
get permission denied, a bit of digging tells me that exim_t is a domain for a
process rather than a type for a file.

Questions:

a) How do I work out what type to set the file to ?

b) I would presumably need to do so for every file in /usr/share/mysql/charsets/

c) Is changing the type on a file so that the MTA can access it the right thing
   anyway, should I not be allowing exim access to usr_t instead ... but would
   that not open things to wide ?

d) More generally: where do I look to get a list of all the XXX_t, what they
   are, what they are supposed to be used for, ... so that I can work out what
   the best choice is ?

Regards


PS I am using CentOS 6.3.

-- 
Alain Williams
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