Daniel J Walsh wrote:
Nicklas Norling wrote:
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@xxxxxxxxxxxxxx>,
bodytype=8BITMIME, relay=apache@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
No, you are seeing a new problem.
See if you can do the following
setsebool -P allow_saslauthd_read_shadow=1
If that is not in your current policy you might need to update it.
Dan
I've set the boolean and turned enforcing back on. Mail works as expected :)
Thanks a lot for all the help Daniel!
Yet another system securer :)
/Nicke
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