A few permission problems

[Nicklas Norling]

Nicklas Norling wrote:

> <snip>
> Since 01:22:00 this day my server is in enforce mode. The only thing 
> I've found so far is sendmail being denied access to urandom and 
> random. I have sendmail setup with SMTP AUTH as well as certs for 
> performing STARTTLS with any TLS-able connecting MTA.
>
> /var/log/messages
> Jul 19 08:09:38 spock kernel: audit(1121753378.808:188): avc:  denied  
> { getattr } for  pid=20520 comm="sendmail" name="urandom" dev=tmpfs 
> ino=846 
> scontext=root:system_r:system_mail_ttcontext=system_u:object_r:urandom_device_t 
> tclass=chr_file
> Jul 19 08:09:38 spock kernel: audit(1121753378.808:189): avc:  denied  
> { getattr } for  pid=20520 comm="sendmail" name="random" dev=tmpfs 
> ino=844 
> scontext=root:system_r:system_mail_ttcontext=system_u:object_r:random_device_t 
> tclass=chr_file
>
> /var/log/maillog
> Jul 19 08:09:38 spock sendmail[20520]: j6J69cMx020520: from=<edited>, 
> size=874, class=0, nrcpts=1, 
> msgid=<bd1035dcc05d7b2d6a16b046ae4bdd04 at www.exinor.net>, 
> bodytype=8BITMIME, relay=apache at localhost
> Jul 19 08:09:38 spock sendmail[20520]: j6J69cMx020520: 
> STARTTLS=client, error: connect failed=-1, SSL_error=5, timedout=0, 
> errno=2
> Jul 19 08:09:38 spock sendmail[20520]: ruleset=tls_server, 
> arg1=SOFTWARE, relay=[127.0.0.1], reject=403 4.7.0TLS handshake.
> Jul 19 08:09:38 spock sendmail[20520]: j6J69cMx020520: to=<edited>, 
> ctladdr=<edited> (48/48), delay=00:00:00, xdelay=00:00:00, 
> mailer=relay, pri=30874, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, 
> stat=Deferred: 403 4.7.0 TLS handshake.
> Jul 19 08:09:38 spock sendmail[20521]: STARTTLS=server, error: accept 
> failed=0, SSL_error=5, timedout=0,errno=0
> Jul 19 08:09:38 spock sendmail[20521]: j6J69cai020521: localhost 
> [127.0.0.1] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
>
> audit2allow -d -l
> allow system_mail_t random_device_t:chr_file getattr;
> allow system_mail_t urandom_device_t:chr_file getattr;
>
> Policy rpm installed: selinux-policy-targeted-1.25.1-9.noarch.rpm
>
<snip>

I've installed selinux-policy-targeted-sources-1.25.1-9.noarch.rpm, edited
/etc/selinux/targeted/src/policy/domains/misc/local.te to contain:

allow system_mail_t random_device_t:chr_file getattr;
allow system_mail_t urandom_device_t:chr_file getattr;

Then did a 'make reload' in /etc/selinux/targeted/src/policy as per 
instructions I found on the net.
This made the sendmail TLS errors go away, however, trying smtp auth 
saslauthd complains instead:

Jul 19 14:14:19 spock saslauthd[22499]: do_auth         : auth failure: 
[user=<edited>] [service=smtp] [realm=] [mech=shadow] [reason=Unknown]
Jul 19 14:14:19 spock saslauthd[22500]: do_auth         : auth failure: 
[user=<edited>] [service=smtp] [realm=] [mech=shadow] [reason=Unknown]

'setenforce 0' makes it all work. No avc's in the logs during enforcing 
mode.

I guess my pathetic attempts at creating local rules failed misserably :(
I'm in way over my head here I think... Any pointers?
/Nicke