Daniel J Walsh wrote:
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Paul Howarth wrote:
Daniel J Walsh wrote:
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Paul Howarth wrote:
Hi Dan,
Daniel J Walsh wrote:
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Paul Howarth wrote:
Paul Howarth wrote:
Since upgrading my mail server from Fedora 7 to Fedora 8, I've come
across some problems with the sockets used for communication between
sendmail and two of the "milter" plugins I'm using with it, namely
milter-regex and spamass-milter. It's very likely that other milters
will have similar issues.
The sockets used are created when the milter starts, as follows:
milter-regex:
/var/spool/milter-regex/sock (var_spool_t, inherited from parent
directory)
spamass-milter:
/var/run/spamass-milter/spamass-milter.sock (spamd_var_run_t, in
policy)
These are pretty well the upstream locations, though I'm open to
moving the milter-regex socket from /var/spool to /var/run or
elsewhere for consistency.
Since moving to Fedora 8, I've had to add the following to local
policy to get these milters working:
allow sendmail_t spamd_var_run_t:dir { search getattr };
allow sendmail_t spamd_var_run_t:sock_file { getattr write };
allow sendmail_t var_spool_t:sock_file { getattr write };
allow sendmail_t initrc_t:unix_stream_socket { read write
connectto };
The last of these is the strangest, and relates to Bug #425958
(https://bugzilla.redhat.com/show_bug.cgi?id=425958). Whilst the
socket file itself has the context listed above, the unix domain
socket that sendmail connects to is still initrc_t, as can be seen
from the output of "netstat -lpZ":
...
unix 2 [ ACC ] STREAM LISTENING 14142
5853/spamass-milter system_u:system_r:initrc_t:s0
/var/run/spamass-milter/spamass-milter.sock
unix 2 [ ACC ] STREAM LISTENING 13794
5779/milter-regex system_u:system_r:initrc_t:s0
/var/spool/milter-regex/sock
...
So, my questions are:
1. Why are the sockets still initrc_t?
2. Is this a kernel issue or a userspace issue that should be
fixed in
the milters?
3. Should there be a standard place for milter sockets to live,
and if
so, where?
4. How come this worked OK in Fedora 7 and previous releases?
Looking at the source code for these applications, I see that both of
them use the smfi_setconn() function in the sendmail milter library to
set up the sockets. It's therefore likely that this problem is
common to
all milter applications that use unix domain sockets.
I'm now of the opinion that moving the directory locations for these
sockets is a bad idea - it would need corresponding changes in
people's
sendmail configuration files, which would lead to problems for people
doing package updates, or installing from upstream sources. Setting
different context types for the directories (e.g. make
/var/spool/milter-regex spamd_var_run_t) would seem a better option,
along with policy tweaks to allow sendmail to do the permissions
checks
and write to the sockets).
I'm still confused about the initrc_t sockets though.
Paul.
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Ok I will add this to the next update.
What exactly is "this"? The 4 "allow" rules mentioned above, the context
type change for /var/spool/milter-regex mentioned later, both?
Cheers, Paul.
Context change for /var/spool/milter-regex to spamd_var_run_t. sendmail
can already use sockets in this directory.
So that includes the:
allow sendmail_t initrc_t:unix_stream_socket { read write connectto }
?
Cheers, Paul.
Nope. I don't know what is running as initrc_t and I would bet this is
a leaked file descriptor. Or at least a redirectiron of stdin/stdout.
I don't think it's a leaked file descriptor - that would be
dontaudit-able, right? By not allowing communications with the
initrc_t:unix_stream_socket, the milter fails to work:
==> /var/log/audit/audit.log <==
type=AVC msg=audit(1200408212.783:142453): avc: denied { connectto }
for pid=7805 comm="sendmail" path="/var/spool/milter-regex/sock"
scontext=system_u:system_r:sendmail_t:s0
tcontext=system_u:system_r:initrc_t:s0 tclass=unix_stream_socket
type=SYSCALL msg=audit(1200408212.783:142453): arch=40000003 syscall=102
success=no exit=-13 a0=3 a1=bfd9f600 a2=b7f79bd4 a3=0 items=0 ppid=7764
pid=7805 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=51 sgid=51
fsgid=51 tty=(none) comm="sendmail" exe="/usr/sbin/sendmail.sendmail"
subj=system_u:system_r:sendmail_t:s0 key=(null)
==> /var/log/maillog <==
Jan 15 14:43:32 goalkeeper sendmail[7805]: NOQUEUE: connect from
ard120.neoplus.adsl.tpnet.pl [83.26.189.120]
Jan 15 14:43:32 goalkeeper sendmail[7805]: AUTH: available mech=CRAM-MD5
DIGEST-MD5, allowed mech=CRAM-MD5 DIGEST-MD5 LOGIN PLAIN
Jan 15 14:43:32 goalkeeper sendmail[7805]: m0FEhW21007805: Milter
(milter-regex): error connecting to filter: Permission denied
Jan 15 14:43:32 goalkeeper sendmail[7805]: m0FEhW21007805: Milter
(milter-regex): to error state
Jan 15 14:43:32 goalkeeper sendmail[7805]: m0FEhW21007805: Milter:
initialization failed, temp failing commands
Jan 15 14:43:32 goalkeeper sendmail[7805]: m0FEhW21007805: SMTP MAIL
command (<pathrusim@xxxxxxxxxxxxxxxxx>) from
ard120.neoplus.adsl.tpnet.pl [83.26.189.120] tempfailed (due to previous
checks)
The initrc_t type shows up in netstat but not in ls:
# netstat -aZp | grep initrc
tcp 0 0 goalkeeper.intra.:bacula-fd *:*
LISTEN 5864/bacula-fd system_u:system_r:initrc_t:s0
udp 0 0 rbldns.intra.cit:domain *:*
5885/rbldnsd system_u:system_r:initrc_t:s0
unix 2 [ ACC ] STREAM LISTENING 14142
5853/spamass-milter system_u:system_r:initrc_t:s0
/var/run/spamass-milter/spamass-milter.sock
unix 2 [ ACC ] STREAM LISTENING 13794
5779/milter-regex system_u:system_r:initrc_t:s0
/var/spool/milter-regex/sock
unix 2 [ ] DGRAM 2150436
5779/milter-regex system_u:system_r:initrc_t:s0
unix 2 [ ] DGRAM 14141
5853/spamass-milter system_u:system_r:initrc_t:s0
# ls -lZ /var/run/spamass-milter/spamass-milter.sock
/var/spool/milter-regex/sock
srwxr-xr-x sa-milt sa-milt system_u:object_r:spamd_var_run_t:s0
/var/run/spamass-milter/spamass-milter.sock
srw------- mregex mregex system_u:object_r:spamd_var_run_t:s0
/var/spool/milter-regex/sock
Paul.
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