Changing Password Schemes

[Steffen Kaiser]

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On Tue, 3 May 2016, Carl Jeptha wrote:

> OK QUERY is WORKING ("password_query" relies on having a field/column
> "password', hence the addition under WHERE):
> password_query = \
>      SELECT username AS USER, \
>    IF(cryptpwd IS NULL OR cryptpwd=' ', CONCAT('{PLAIN}',clearpwd),
> cryptpwd) AS PASSWORD, \
>    '/var/vmail/%d/%n' as userdb_home, \
>      'maildir:/var/vmail/%d/%n' as userdb_mail, 150 as userdb_uid, 8 as
> userdb_gid \
>      FROM mailbox \
>      WHERE username = '%u' AND active = '1' AND cryptpwd = password ('%w')
>
> But still no happy dance, we now have a new error:
>
> dovecot: imap-login: Disconnected (auth failed, 3 attempts in 15
> secs): user=<user at domain.tld>, method=PLAIN, rip=165.255.109.89,
> lip=10.0.0.12, TLS, session=<LywBS+0xdQCl/21Z>

1st) You should also enable auth debugging.

2nd) You are poking in the dark with SQL without understanding it,

WHERE ... cryptpwd = password ('%w')

????

3rd) I had the impression that you want to upgrade lower hashed passwords 
into stronger hashed ones with a specific scheme and that you therefore 
need to authentificate against two columns, but update the strong hashes 
from the entered plain text password if missing.

If you already have access to the clear/text passwords, hash them, put the 
hashes into the database and be fine. No need for different columns and a
post login script.

Otherwise: Nobody answered this particular question. And I see no 
evidance, that Dovecot passes an environment variable named PLAIN_PASSWORD 
along. I've read the Wiki, but I see nothing like that in the code. Did 
you've verified that the post login script gets the plain password?

If you have hashed passwords, CONCAT('{PLAIN}',clearpwd) is nonsense.

>
>
>
> On Tue, May 3, 2016 at 11:10 AM, Carl Jeptha <cajeptha at gmail.com> wrote:
>
>> Here is what is in phpmyadmin:
>> password_query =
>> SELECT
>>     username as user,
>> SELECT
>>     IF(
>>         cryptpwd IS NULL
>>         OR cryptpwd = '',
>>         CONCAT('{PLAIN}', clearpwd),
>>         cryptpwd
>>      ) as password,
>>     '/var/vmail/%d/%n' as userdb_home,
>>     'maildir:/var/vmail/%d/%n' as userdb_mail,
>>     150 as userdb_uid,
>>     8 as userdb_gid
>> FROM
>>     mailbox
>> WHERE
>>     username = '%u'
>>     AND active = '1'
>>
>> and the error now:
>> #1064 - You have an error in your SQL syntax; check the manual that
>> corresponds to your MySQL server version for the right syntax to use near
>> 'password_query =
>> SELECT
>>     username as user,
>> SELECT
>>     IF(
>>         cryptpwd IS NULL
>>     ' at line 1
>>
>> On Mon, May 2, 2016 at 2:07 PM, Gedalya <gedalya at gedalya.net> wrote:
>>
>>> On 05/02/2016 05:32 AM, Carl Jeptha wrote:
>>>> May  2 05:26:03 |****** dovecot: auth-worker(3442): Error:
>>>> sql(user at domain.tld,xxx.xxx.xxx.xxx): Password query must return a
>>>> field named 'password'
>>> I'm not sure, maybe it's checking case-sensitive. Your query returns
>>> PASSWORD. Make it lowercase.
>>>
>>>>
>>>> For testing purposes I put the query in PHPMyAdmin and it complains this
>>>> (notice it drops "PASSWORD", but shows it in the query:
>>>> #1064 - You have an error in your SQL syntax; check the manual that
>>>> corresponds to your MySQL server version for the right syntax to use
>>> near '\
>>>>     IF(cryptpwd IS NULL OR cryptpwd='', CONCAT('{PLAIN}',clearpwd),
>>>> cryptpwd) as ' at line 1
>>>>
>>>>
>>> It also sarts with a \ ... did you leave that in? That is specific to the
>>> dovecot config file. In PHPMyAdmin you should remove the line-continuation
>>> backslashes.
>>>
>>> Actually if you use the mysql command-line client, you would be able to
>>> paste that in with the backlashes.
>>>
>>> Make sure to put in a real value in WHERE username = '%u' <<<
>>>
>>
>>
>

- -- 
Steffen Kaiser
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