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fedora-selinux: Re: Clamd - again...

Re: Clamd - again...

From: Dominick Grift <domg472_at_nospam>
Date: Mon Aug 23 2010 - 08:42:57 GMT
To: selinux@lists.fedoraproject.org

On 08/23/2010 10:40 AM, Arthur Dent wrote:
> On Mon, 2010-08-23 at 10:29 +0200, Dominick Grift wrote:
>> On 08/23/2010 10:09 AM, Arthur Dent wrote:
>>> On Sun, 2010-08-22 at 22:44 +0100, Arthur Dent wrote:
>>>> On Sun, 2010-08-22 at 23:07 +0200, Dominick Grift wrote:
>>>>> On 08/22/2010 08:24 PM, Arthur Dent wrote:
>>>> ----
>>> time->Mon Aug 23 08:57:07 2010
>>> type=SYSCALL msg=audit(1282550227.058:42734): arch=40000003 syscall=102 success=no exit=-13 a0=3 a1=bf800420 a2=3 a3=1 items=0 ppid=23912 pid=23920 auid=4294967295 uid=0 gid=12 euid=0 suid=0 fsuid=0 egid=12 sgid=12 fsgid=12 tty=(none) ses=4294967295 comm="clamdscan" exe="/usr/local/bin/clamdscan" subj=system_u:system_r:procmail_t:s0 key=(null)
>>> type=AVC msg=audit(1282550227.058:42734): avc: denied { search } for pid=23920 comm="clamdscan" name="clamd" dev=sda6 ino=269280 scontext=system_u:system_r:procmail_t:s0 tcontext=system_u:object_r:clamd_var_run_t:s0 tclass=dir
>>
>> This is still an issue:
>>
>> some process running in the procmail_t domain is running
>> /usr/bin/clamdscan (ls -alZ /usr/bin/clamdscan to verify its context),
>> but it is not domain transitioning to the clamscan_t domain.
>
> # which clamdscan
> /usr/local/bin/clamdscan
>
> # ls -laZ /usr/local/bin/clamdscan
> -rwxr-xr-x. root root system_u:object_r:bin_t:s0 /usr/local/bin/clamdscan
>
> Now, in actual fact, procmail does not call clamdscan directly (it can't
> deal with emails), it calls a program called clamassassin which in turn
> calls clamdscan.
>
> # ls -laZ /usr/local/bin/clamassassin
> -r-xr-xr-x. root root system_u:object_r:bin_t:s0 /usr/local/bin/clamassassin
>

Why are these files located there and not /usr/bin where they are
expected to be? The files are mislabelled.

>>
>> Policy defines that if a process running in the procmail_t domain runs a
>> file labelled clamscan_exec_t, that procmail_t will domain transition to
>> clamscan_t domain.
>>
>> This did not happen on your config.
>>
>> Either your clamdscan executable file is mislabelled or you are missing
>> a domain transition rule.
>>
>> Where is your "clamdscan" executable file located, and what is it labelled?
>
> see above.
>
>> What does the following return:
>>
>> sesearch -SC --allow -s procmail_t -t clamscan_t -c process
>> sesearch -SC --allow -s procmail_t -t clamscan_exec_t -f file
>
> # sesearch -SC --allow -s procmail_t -t clamscan_t -c process
> Found 1 semantic av rules:
> allow procmail_t clamscan_t : process transition ;
>
> # sesearch -SC --allow -s procmail_t -t clamscan_exec_t -f file
> sesearch: invalid option -- 'f'
> Usage: sesearch [OPTIONS] RULE_TYPE [RULE_TYPE ...] [EXPESSION]
> [POLICY ...]
>
> Try sesearch --help for more help.
>
>
>
>
>
>
>
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