[Dovecot] Disable IMAP for ONE user only

[Rick Romero]

  You don't need vpopmail - that's just an example.  It has it's own table
structure.   

Are you the only user - I missed that part of the question.  If so, ignore
the 'Bit Operator' part, you won't need it.  That's to allow different
types of access per user (and makes the query that much more complex).

Change your user table structure and add a 2nd password field named
'imap_password', then change your Dovecot query SQL to the below:

SELECT email as user, if(%r == '127.0.0.1', password,imap_password) as
password FROM virtual_users WHERE email='%u';

That will return the contents of 'password' when you use webmail (assuming
it's all installed on one box), and 'imap_password' when you connect from
any other system. 

If you're unfamiliar with modifing MySQL tables, install phpmyadmin (and
lock it down) or another visual MySQL client.

If there are multiple users, you'll need to either change the query to just
match your username or add another field to do a bit check and make the
query more complex... :)

Rick

Quoting SIW <bov at bsdpanic.com>:

> Hi Rick
>
> I really appreciate your response!
>
> Unfortunately my SQL is, how can we say, very basic. I built my server
> using the Linode guide at:
>
> https://library.linode.com/email/postfix/postfix2.9.6-dovecot2.0.19-mysql
>
> Currently my password query looks as follows:
>
> password_query = SELECT email as user, password FROM virtual_users WHERE
> email='%u';
>
> I'm not familiar with VPopMail, would I need it in this situation?
> Currently I use Postfix/Dovecot/MySQL/Apache/Roundcube.
>
> On 05/05/2014 21:32, Rick Romero wrote:
>> Quoting Professa Dementia <professa at dementianati.com>:
>>
>>> On 5/5/2014 1:05 PM, SIW wrote:
>>>> Thats a good point.
>>>>
>>>> If I block IMAP/SMTP access to ONE user does that mean that particular
>>>> user can't use Roundcube anymore?
>>>
>>> That is correct.  If you block IMAP, then webmail will not work.
>>
>> Not necessarily.
>>
>> From:
>> http://wiki2.dovecot.org/AuthDatabase/VPopMail
>>
>> "logically this means: show password for user=%n at domain=%d when imap
>> on
>> the account is not disabled and connection is not comming from localhost
>> when webmail access on the account is not disabled and if imap for the
>> domain is not disabled and (connection is not comming from localhost
when
>> webmail access for the domain is not disabled) when vlimits are not
>> overriden on the account "
>> #
>> password_query = select pw_passwd as password FROM vpopmail LEFT JOIN
>> limits ON vpopmail.pw_domain=limits.domain WHERE pw_name='%n' and
>> pw_domain='%d' and !(pw_gid & 8) and ('%r'!='127.0.0.1' or !(pw_gid &
4))
>> and ( ('%r'!='127.0.0.1' or COALESCE(disable_webmail,0)!=1) and
>> COALESCE(disable_imap,0)!=1 or (pw_gid & 8192) );
>>
>> So construct your SQL query in a way that your bit field in MySQL
>> disables
>> all access for a single user except when the source IP is your webmail
>> server.
>>
>> If you want multiple passwords, you can modify the password_query with
>> iif
>> statements based on the source IP or protocol.
>>
>> Like:
>> select iif(%r == '127.0.0.1' & pw_name== 'yourname' &
>> pw_domain='yourdomain',pw_webmailpasswrd,pw_passwd) as pw_passwd from
>> vpopmail .....
>> Of course that's specific to the vpopmail table... modify as needed for
>> your own table structure...
>> Rick
>
>