Changing Password Schemes
Carl Jeptha
cajeptha at gmail.com
Tue May 3 16:29:29 UTC 2016
Thank you,
Due to changes I had to make to let password_query work, I think your
"quick" version should be like this my setup:
UPDATE mailbox set password = ENCRYPT(clearpwd, CONCAT('$6$',sha(RAND()))) WHERE password IS NULL OR password=' ';
------------
You have a good day now, en mag jou môre ook so wees,
Carl A Jeptha
On 2016-05-03 18:10, Gedalya wrote:
> The script I sent you should do the job of populating your cryptpwd column with a SHA512-CRYPT version of the clearpwd column.
> The only reason why you would bother with a perl script is to get a better quality salt from /dev/urandom
> If you don't care so much about the quality of the salt, you can just run this single query.
> Make a backup of your database first!!
>
> UPDATE mailbox set cryptpwd = ENCRYPT(clearpwd, CONCAT('$6$',sha(RAND()))) WHERE cryptpwd IS NULL OR cryptpwd=' ';
>
> Here you are using MySQL's RAND() function to generate salt. It will do the minimum job of making the resulting encrypted password not equal to a SHA512 of the password itself, but the salt isn't very random. So the perl script I sent you reads 12 bytes of better quality random data from /dev/urandom and uses that. This means that if your database gets stolen it will be harder to decrypt the passwords.
>
>
> On 05/03/2016 11:58 AM, Carl Jeptha wrote:
>> Steffen,
>> If you can point me in the direction as to how to convert a column of clear text passwords to SHA512-CRYPT I will be happy to follow it and close this query, I only came here because I had spent almost two weeks trying to make the dovecot wiki work and thought someone would point out the mistakes I had made.
>>
>> But otherwise, I will move on, and not waste anyone's time anymore.
>>
>> ------------
>> You have a good day now, en mag jou môre ook so wees,
>>
>>
>> Carl A Jeptha
>>
>> On 2016-05-03 07:02, Steffen Kaiser wrote:
>>> -----BEGIN PGP SIGNED MESSAGE-----
>>> Hash: SHA1
>>>
>>> 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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