On 2/6/19 10:59 AM, Ondrej Mosnacek wrote:
> On Tue, Feb 5, 2019 at 6:57 PM Robert Moskowitz <rgm(a)htt-consult.com> wrote:
>> On 2/5/19 10:41 AM, Ondrej Mosnacek wrote:
>>> On Tue, Feb 5, 2019 at 2:54 PM Robert Moskowitz <rgm(a)htt-consult.com>
wrote:
>>>>
>>>> On 2/5/19 3:23 AM, Zdenek Pytela wrote:
>>>>
>>>>
>>>>
>>>> On Mon, Feb 4, 2019 at 9:03 PM Robert Moskowitz
<rgm(a)htt-consult.com> wrote:
>>>>> I am working with Centos7:
>>>>>
>>>>> I have configured Dovecot to connect to mysqld via socket:
>>>>>
>>>>> connect = host=/var/lib/mysql/mysql.sock dbname=postfix user=postfix
>>>>> password=Postfix_Database_Password
>>>>>
>>>>> I test sending a message with
>>>>>
>>>>> sendmail -i rgm(a)test.htt-consult.com < README
>>>>>
>>>>> This fails with the following message in maillog
>>>>>
>>>>> Feb 4 11:28:48 klovia dovecot: dict(13122): Error:
>>>>> mysql(/var/lib/mysql/mysql.sock): Connect failed to database
(postfix):
>>>>> Can't connect to local MySQL server through socket
>>>>> '/var/lib/mysql/mysql.sock' (13) - waiting for 25 seconds
before retry
>>>>>
>>>>> If I setenforce to 0, the connection works. So it clearly is an
SELinux
>>>>> problem. I worked on this almost 2 years ago on another system and
found:
>>>>>
>>>>>
http://zszsit.blogspot.com/2012/12/dovecot-mysql-selinux-issue-on-centos6...
>>>>>
>>>>> But I was hoping that there were better tools now with Centos7. I
>>>>> checked for setsebool at:
>>>>>
>>>>>
https://linux.die.net/man/8/mysqld_selinux
>>>>>
>>>>> and tried:
>>>>>
>>>>> setsebool -P allow_user_mysql_connect 1
>>>>>
>>>>> But the mail still does not go unless I setenforce to 0.
>>>> Hi,
>>>>
>>>> this boolean allows a different permission - see the manual page:
>>>>>> If you want to allow users to connect to mysql, you must turn on
the allow_user_mysql_connect boolean.
>>>>> Is there someway to get SELinux to allow dovecot (and postfix) to
>>>>> connect to mysqld?
>>>> While dovecot is allowed to connect to postgresql port, there is no
similar permission for mysql:
>>>>
>>>> # sesearch -A -s dovecot_t -c tcp_socket -p name_connect | grep sql
>>>> allow dovecot_t postgresql_port_t:tcp_socket name_connect;
>>>>
>>>> However, if this permission is the only one missing, you can simply add
it with:
>>>>
>>>> # echo '(allow dovecot_t mysqld_port_t (tcp_socket
(name_connect)))' > dovecot-mysql.cil
>>>> # semodule -i dovecot-mysql.cil
>>>> # sesearch -A -s dovecot_t -c tcp_socket -p name_connect | grep sql
>>>> allow dovecot_t mysqld_port_t:tcp_socket name_connect;
>>>> allow dovecot_t postgresql_port_t:tcp_socket name_connect;
>>>>
>>>>
>>>> Still getting the error. This does not seem to be what is needed.
Isn't this to open TCP access where I am using the unix socket interface?
>>> Indeed, what Zdenek advised is for allowing to connect via TCP. Could
>>> you try the following instead?
>>>
>>> dnf install selinux-policy-devel
>> Nit this is CentOS7, so yum. In fact it is CentOS7-armhfp...
>>
>>> cat >dovecot_mysql.te <<EOF
>>> policy_module(dovecot_mysql,1.0.0)
>>> gen_require(`
>>> type dovecot_t;
>>> ')
>>> mysql_read_config(dovecot_t)
>>> mysql_stream_connect(dovecot_t)
>>> EOF
>> For some reason this made an empty file. Don't know if it was the lack
>> of spaces on that first line? I use this myself a lot, but always put
>> spaces around the > and <<
> As other have already pointed out, it was because of the unescaped
> backtick. I initially started with just the last two lines and later
> realized the other lines are also needed, so I just vim'd the file and
> copy-pasted the new contents into the e-mail without checking if it
> still works :)
>
>> So I just used vi this time. :)
>>
>>> make -f /usr/share/selinux/devel/Makefile dovecot_mysql.pp
>>> semodule -i dovecot_mysql.pp
>> And the sendmail test went through with enforcing.
>>
>> thanks!
> Great! I submitted a PR to allow this in Fedora policy, since it seems
> like a valid use case. Hopefully it gets to RHEL/CentOS from there
> eventually.
>
>
https://github.com/fedora-selinux/selinux-policy-contrib/pull/86
>
Thanks Ondrej, for PR, it's already merged and back ported to Fedora 28
and Fedora 29.
https://github.com/fedora-selinux/selinux-policy-contrib/commit/e7c5f327c...
Robert,
Do you have some more SELinux denials (AVC msgs) in audit.log after
workaround from Ondrej? If yes, please attach it , we can work on them.
I suspect
mysql_tcp_connect(dovecot_t)
is also neede for someone not using a local db.
- Thomas