Hi,
After configuring systemd unit with ReadWritePaths=/home/mail, I get the
following error logs in audit:
type=AVC msg=audit(1586604621.637:6736): avc: denied { write } for
pid=12750 comm="imap" name="Maildir" dev="dm-3"
ino=438370738
scontext=system_u:system_r:dovecot_t:s0
tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0
type=SYSCALL msg=audit(1586604621.637:6736): arch=c000003e syscall=83
success=no exit=-13 a0=55b493a7f338 a1=1ed a2=ffffffff a3=fffffffffffffcd8
items=0 ppid=12735 pid=12750 auid=4294967295 uid=1005 gid=1005 euid=1005
suid=1005 fsuid=1005 egid=1005 sgid=1005 fsgid=1005 tty=(none)
ses=4294967295 comm="imap" exe="/usr/libexec/dovecot/imap"
subj=system_u:system_r:dovecot_t:s0 key=(null)
type=PROCTITLE msg=audit(1586604621.637:6736):
proctitle="dovecot/imap"
type=AVC msg=audit(1586604621.638:6737): avc: denied { write } for
pid=12750 comm="imap" name="Maildir" dev="dm-3"
ino=438370738
scontext=system_u:system_r:dovecot_t:s0
tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0
type=SYSCALL msg=audit(1586604621.638:6737): arch=c000003e syscall=21
success=no exit=-13 a0=55b493a7f508 a1=2 a2=55b493a7f388 a3=fffffffe
items=0 ppid=12735 pid=12750 auid=4294967295 uid=1005 gid=1005 euid=1005
suid=1005 fsuid=1005 egid=1005 sgid=1005 fsgid=1005 tty=(none)
ses=4294967295 comm="imap" exe="/usr/libexec/dovecot/imap"
subj=system_u:system_r:dovecot_t:s0 key=(null)
type=PROCTITLE msg=audit(1586604621.638:6737):
proctitle="dovecot/imap"
I have SELinux enabled, on CentOS.
If I run:
audit2why < /var/log/audit/audit.log
I get:
type=AVC msg=audit(1586601301.044:6707): avc: denied { write } for
pid=9930 comm="imap" name="Maildir" dev="dm-3"
ino=438370738
scontext=system_u:system_r:dovecot_t:s0
tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0
Was caused by:
Missing type enforcement (TE) allow rule.
I think it's important to know that I'm trying to use dovecot with
virtual
users. If I try to configure it with PAM authentication using system users,
it works well.
Any suggestions on this?
Mura Andrei
On Sat, Apr 11, 2020 at 10:02 AM Andrei Petru Mura <mapandrei at
gmail.com>
wrote:
> I think I found here what I'm interested in:
> https://doc.dovecot.org/admin_manual/system_users_used_by_dovecot/.
>
> On Sat, Apr 11, 2020 at 9:52 AM Andrei Petru Mura <mapandrei at
gmail.com>
> wrote:
>
>> Hi Aki,
>>
>> Thanks. I was especially interested in documentation related to dovecot
>> and it's users permissions, the way in which dovecot uses users.
Till now I
>> found only spread information on different articles from dovecot's
website.
>>
>> Thanks,
>> Mura Andrei
>>
>> On Sat, Apr 11, 2020 at 9:49 AM Aki Tuomi <aki.tuomi at
open-xchange.com>
>> wrote:
>>
>>> Hi,
>>>
>>>
>>>
https://www.freedesktop.org/software/systemd/man/systemd.exec.html#ReadWritePaths>>>
>>> although we probably need to add some words into doc.dovecot.org
under
>>> known issues.
>>>
>>> Aki
>>>
>>> > On 11/04/2020 09:24 Andrei Petru Mura <mapandrei at
gmail.com> wrote:
>>> >
>>> >
>>> > Hi Aki,
>>> >
>>> > Any documentation on this topic?
>>> >
>>> > Mura Andrei
>>> >
>>> >
>>> > On Mon, Apr 6, 2020 at 5:27 PM Aki Tuomi <aki.tuomi at
open-xchange.com>
>>> wrote:
>>> > > This is probably caused by systemd (or selinux or both).
>>> > >
>>> > > With systemd, you need to add
>>> > >
>>> > > ReadWritePaths=/home/mail
>>> > >
>>> > > to the systemd unit.
>>> > >
>>> > > Then you can check /var/log/audit/audit.log for any
selinux
>>> specific problems. If you are using Centos/Redhat.
>>> > >
>>> > > Aki
>>> > >
>>> > > > On 06/04/2020 17:01 Andrei Petru Mura <mapandrei
at gmail.com>
>>> wrote:
>>> > > >
>>> > > >
>>> > > > Hi,
>>> > > >
>>> > > > Dovecot version 2.2.36
>>> > > > In log files I get this error:
>>> > > > dovecot: imap(test): Namespace '':
>>> mkdir(/home/mail/domain/test/Maildir) failed: Permission denied
>>> (euid=1005(vmail) egid=1005(vmail) missing +w perm:
/home/mail/domain, UNIX
>>> perms appear ok (ACL/MAC wrong?))
>>> > > >
>>> > > > My authentication configuration is this:
>>> > > > passdb {
>>> > > > driver = passwd-file
>>> > > > args = username_format=%n /etc/dovecot/users
>>> > > > }
>>> > > >
>>> > > > userdb {
>>> > > > driver = static
>>> > > > args = uid=vmail gid=vmail
home=/home/mail/domain/%n
>>> username_format=%n /etc/dovecot/users
>>> > > >
>>> > > > }
>>> > > >
>>> > > > /home/mail/domain/test directory is owned by vmail
user.
>>> > > > How to fix this?
>>> > > >
>>> > > > Mura Andrei
>>> > >
>>>
>>
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Am 11.04.2020 um 13:00 schrieb Andrei Petru Mura:> Hi, > > After configuring systemd unit with ReadWritePaths=/home/mail, I get the > following error logs in audit: > type=AVC msg=audit(1586604621.637:6736): avc: denied { write } for > pid=12750 comm="imap" name="Maildir" dev="dm-3" ino=438370738 > scontext=system_u:system_r:dovecot_t:s0 > tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0 > type=SYSCALL msg=audit(1586604621.637:6736): arch=c000003e syscall=83 > success=no exit=-13 a0=55b493a7f338 a1=1ed a2=ffffffff a3=fffffffffffffcd8 > items=0 ppid=12735 pid=12750 auid=4294967295 uid=1005 gid=1005 euid=1005 > suid=1005 fsuid=1005 egid=1005 sgid=1005 fsgid=1005 tty=(none) > ses=4294967295 comm="imap" exe="/usr/libexec/dovecot/imap" > subj=system_u:system_r:dovecot_t:s0 key=(null) > type=PROCTITLE msg=audit(1586604621.637:6736): proctitle="dovecot/imap" > type=AVC msg=audit(1586604621.638:6737): avc: denied { write } for > pid=12750 comm="imap" name="Maildir" dev="dm-3" ino=438370738 > scontext=system_u:system_r:dovecot_t:s0 > tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0 > type=SYSCALL msg=audit(1586604621.638:6737): arch=c000003e syscall=21 > success=no exit=-13 a0=55b493a7f508 a1=2 a2=55b493a7f388 a3=fffffffe > items=0 ppid=12735 pid=12750 auid=4294967295 uid=1005 gid=1005 euid=1005 > suid=1005 fsuid=1005 egid=1005 sgid=1005 fsgid=1005 tty=(none) > ses=4294967295 comm="imap" exe="/usr/libexec/dovecot/imap" > subj=system_u:system_r:dovecot_t:s0 key=(null) > type=PROCTITLE msg=audit(1586604621.638:6737): proctitle="dovecot/imap" > > I have SELinux enabled, on CentOS. > If I run: > audit2why < /var/log/audit/audit.log > > I get: > type=AVC msg=audit(1586601301.044:6707): avc: denied { write } for > pid=9930 comm="imap" name="Maildir" dev="dm-3" ino=438370738 > scontext=system_u:system_r:dovecot_t:s0 > tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0 > > Was caused by: > Missing type enforcement (TE) allow rule. > > I think it's important to know that I'm trying to use dovecot with virtual > users. If I try to configure it with PAM authentication using system users, > it works well. > > Any suggestions on this?Looks like /home/mail as mail store isn't included in the default SELinux policy. Did you make sure that the correct SELinux type is set on the directories? https://www.unix.com/man-page/centos/8/dovecot_selinux/ If this isn't enough to get you going you might need to create your own policy. The following steps should be all that it takes to create your own policy. Check that grep includes only lines that you want included in your new policy: grep dovecot /var/log/audit/audit.log | audit2allow -w Create your new policy for Dovecot and install it: grep dovecot /var/log/audit/audit.log | audit2allow -M dovecot_custom semodule -i dovecot_custom.pp -- Alex JOST
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<br>
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<blockquote type="cite">
<div>
On 11/04/2020 15:47 Alex JOST <
<a
href="mailto:jost+lists@dimejo.at">jost+lists@dimejo.at</a>>
wrote:
</div>
<div>
<br>
</div>
<div>
<br>
</div>
<div>
Am 11.04.2020 um 13:00 schrieb Andrei Petru Mura:
</div>
<blockquote type="cite">
<div>
Hi,
</div>
<div>
<br>
</div>
<div>
After configuring systemd unit with ReadWritePaths=/home/mail, I get the
</div>
<div>
following error logs in audit:
</div>
<div>
type=AVC msg=audit(1586604621.637:6736): avc: denied { write } for
</div>
<div>
pid=12750 comm="imap" name="Maildir"
dev="dm-3" ino=438370738
</div>
<div>
scontext=system_u:system_r:dovecot_t:s0
</div>
<div>
tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0
</div>
<div>
type=SYSCALL msg=audit(1586604621.637:6736): arch=c000003e syscall=83
</div>
<div>
success=no exit=-13 a0=55b493a7f338 a1=1ed a2=ffffffff a3=fffffffffffffcd8
</div>
<div>
items=0 ppid=12735 pid=12750 auid=4294967295 uid=1005 gid=1005 euid=1005
</div>
<div>
suid=1005 fsuid=1005 egid=1005 sgid=1005 fsgid=1005 tty=(none)
</div>
<div>
ses=4294967295 comm="imap"
exe="/usr/libexec/dovecot/imap"
</div>
<div>
subj=system_u:system_r:dovecot_t:s0 key=(null)
</div>
<div>
type=PROCTITLE msg=audit(1586604621.637:6736):
proctitle="dovecot/imap"
</div>
<div>
type=AVC msg=audit(1586604621.638:6737): avc: denied { write } for
</div>
<div>
pid=12750 comm="imap" name="Maildir"
dev="dm-3" ino=438370738
</div>
<div>
scontext=system_u:system_r:dovecot_t:s0
</div>
<div>
tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0
</div>
<div>
type=SYSCALL msg=audit(1586604621.638:6737): arch=c000003e syscall=21
</div>
<div>
success=no exit=-13 a0=55b493a7f508 a1=2 a2=55b493a7f388 a3=fffffffe
</div>
<div>
items=0 ppid=12735 pid=12750 auid=4294967295 uid=1005 gid=1005 euid=1005
</div>
<div>
suid=1005 fsuid=1005 egid=1005 sgid=1005 fsgid=1005 tty=(none)
</div>
<div>
ses=4294967295 comm="imap"
exe="/usr/libexec/dovecot/imap"
</div>
<div>
subj=system_u:system_r:dovecot_t:s0 key=(null)
</div>
<div>
type=PROCTITLE msg=audit(1586604621.638:6737):
proctitle="dovecot/imap"
</div>
<div>
<br>
</div>
<div>
I have SELinux enabled, on CentOS.
</div>
<div>
If I run:
</div>
<div>
audit2why < /var/log/audit/audit.log
</div>
<div>
<br>
</div>
<div>
I get:
</div>
<div>
type=AVC msg=audit(1586601301.044:6707): avc: denied { write } for
</div>
<div>
pid=9930 comm="imap" name="Maildir"
dev="dm-3" ino=438370738
</div>
<div>
scontext=system_u:system_r:dovecot_t:s0
</div>
<div>
tcontext=unconfined_u:object_r:etc_runtime_t:s0 tclass=dir permissive=0
</div>
<div>
<br>
</div>
<div>
Was caused by:
</div>
<div>
Missing type enforcement (TE) allow rule.
</div>
<div>
<br>
</div>
<div>
I think it's important to know that I'm trying to use dovecot with
virtual
</div>
<div>
users. If I try to configure it with PAM authentication using system users,
</div>
<div>
it works well.
</div>
<div>
<br>
</div>
<div>
Any suggestions on this?
</div>
</blockquote>
<div>
Looks like /home/mail as mail store isn't included in the default
</div>
<div>
SELinux policy. Did you make sure that the correct SELinux type is set
</div>
<div>
on the directories?
</div>
<div>
<a
href="https://www.unix.com/man-page/centos/8/dovecot_selinux/"
rel="noopener"
target="_blank">https://www.unix.com/man-page/centos/8/dovecot_selinux/</a>
</div>
<div>
<br>
</div>
<div>
<br>
</div>
<div>
If this isn't enough to get you going you might need to create your own
</div>
<div>
policy. The following steps should be all that it takes to create your
</div>
<div>
own policy.
</div>
<div>
<br>
</div>
<div>
Check that grep includes only lines that you want included in your new
</div>
<div>
policy:
</div>
<div>
grep dovecot /var/log/audit/audit.log | audit2allow -w
</div>
<div>
<br>
</div>
<div>
Create your new policy for Dovecot and install it:
</div>
<div>
grep dovecot /var/log/audit/audit.log | audit2allow -M dovecot_custom
</div>
<div>
semodule -i dovecot_custom.pp
</div>
<div>
<br>
</div>
<div>
--
</div>
<div>
Alex JOST
</div>
</blockquote>
<div>
<br>
</div>
<div>
<br>
</div>
<div>
Or just label the directory with mail_home_rw_t
</div>
<div>
<br>
</div>
<div class="io-ox-signature">
<pre>---
Aki Tuomi</pre>
</div>
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