mail_crypt module and error with tmp directory

[Fiorenza Meini]

Il 03/05/21 11:37, Aki Tuomi ha scritto:
> 
>> On 03/05/2021 11:53 Fiorenza Meini <fmeini at esseweb.eu> wrote:
>>
>>   
>> Il 03/05/21 10:42, Aki Tuomi ha scritto:
>>>
>>>> On 03/05/2021 11:16 Fiorenza Meini <fmeini at esseweb.eu> wrote:
>>>>
>>>>    
>>>> Il 03/05/21 09:47, Aki Tuomi ha scritto:
>>>>>
>>>>>> On 03/05/2021 10:42 Fiorenza Meini <fmeini at esseweb.eu> wrote:
>>>>>>
>>>>>>     
>>>>>> Hi,
>>>>>> I successfully enable mail_crypt module but I'm experiencing a strange
>>>>>> behaviour with tmp directory while accessing with POP3 protocol:
>>>>>>
>>>>>> I see in log file:
>>>>>> Error: istream-seekable: safe_mkstemp(/tmp/dovecot.pop3.) failed:
>>>>>> Permission denied
>>>>>>
>>>>>> I changed tmp directory configuration (mail_temp_dir variable) and
>>>>>> setting it with 777 permission, but the error is the same.
>>>>>>
>>>>>> On client side it's working everything, but I'd like to understand the
>>>>>> error and if I have to be worried about it.
>>>>>>
>>>>>> Thank you and regards
>>>>>> Fiorenza
>>>>>>
>>>>>> -- 
>>>>>> Fiorenza Meini/Spazio Web
>>>>>>
>>>>>
>>>>> Are you by chance using selinux or apparmor there which could prevent this? Also Dovecot's stock systemd unit prevenst you from writing into random locations, /tmp should be fine though.
>>>>>
>>>>> Aki
>>>>>
>>>>
>>>> Hi,
>>>> I have apparmor installed on the machine, but even if stopped it the
>>>> problem didn't solved.
>>>>
>>>> I think dovecot's systemd unit file configuration is this
>>>> one:/usr/lib/tmpfiles.d/dovecot.conf
>>>>
>>>> It's content is this:
>>>> # Type Path                    Mode UID  GID     Age Argument
>>>> d      /var/run/dovecot/       0755 root root    -   -
>>>> d      /var/run/dovecot/login/ 0750 root dovecot -   -
>>>>
>>>> Should I insert here a line for /tmp directory ?
>>>>
>>>> Thank you and regards
>>>>
>>>> Fiorenza
>>>
>>> I don't think you need to do that.
>>>
>>> Also note that since you're using systemd, dovecot has PrivateTmp=yes, which means that /tmp is actually /tmp/*service*dovecot*/tmp
>>>
>>> Aki
>>>
>>
>> Hi,
>> thank you.
>> I can't see that directory under /tmp.... Is there a way to create it?
>>
>> Regards
>> Fiorenza
> 
> Depends a lot on your setup. I see I got the mask wrong, it's really
> 
>   /tmp/*systemd*dovecot*/tmp
> 
> Aki
> 

Hi, I tried to create manually /tmp/*systemd*dovecot*/tmp and I set 777 
on these directory.  Restarted dovecot, nothing changed and the error is 
the same.

Trying to understand which is exactly the tmp directory used by dovecot, 
I configured the variable mail_temp_dir, and I saw that dovecot used the 
directory configured, which was different from /tmp.

Under what conditions does dovecot use the temporary directory?

Thank you and regards

Fiorenza