[Dovecot] Integrating with Drupal SQL db

Tue Mar 12 16:41:42 EET 2013

On 3/11/13 10:54 PM, info at stos.se wrote:
> Hi again,
>
> this is what I've found regarding how Drupal 7 hashes.
>
> $hash = md5($salt . $password, TRUE);
> do {
>      $hash = md5($hash . $password, TRUE);
> } while (--$count);
>
>
> The whole final hash value is encoded into 16 base64 characters and
> prepended by an identifying string, the standard phpass MD5 mode uses $P$
> (Drupal’s modified version uses $S$ to indicate SHA-512) and a single
> base64 character to indicate the number of MD5 iterations used. Examples of
> a hashed password are:
>
> # Drupal 7 hash
> $S$CgwilRJS4VIF1.2y0R7B4qkXJ8F8SJPcuvXRKGlMWESVXMST.5n4
>
> WordPress 3.0.4 uses the phpass default of 8193 iterations ($count being
> 8192) and Drupal 7 uses 16385 — notice that the Drupal password has C
> after the identifier whereas WordPress has B, converted from crypt style
> base64 (character set [./0-9A-Za-z]) these are 14 and 13 respectively, then
> take 214 + 1 = 16385. A John the Ripper benchmark, after patching and
> enabling the usage of phpass portable passwords (WordPress style, 8193
> iterations), quotes approximately 700 passwords checked per second.
>
> Can I use this inforamtion to make Dovecot understand how to interpret the
> hash?
>
> Thanks!
>
> Regards
> Tobias
>
> On Mon, 11 Mar 2013 14:00:22 -0500, "list at airstreamcomm.net"
> <list at airstreamcomm.net> wrote:
>> On 3/11/13 11:57 AM, info at stos.se wrote:
>>> Hi
>>>
>>> I'm trying to get Dovecot to use Drupal users password for
> authenticating
>>> IMAP users. But I just cant figure out how to make Dovecot understand
> the
>>> password hash type that Drupal 7 is using.
>>>
>>> My example user with password Teacher1 looks like this in Drupal
>>> database:
>>> $S$DZwJa.U8HXT2PvTmwCK13rGEYEvnx5DB6/hlqnfCBum4s4U7MVWU
>>>
>>> Dovecot retrieves this hash but complains that its not a recognized hash
>>> type, or that the hash is wrong, depending on if I change the default
>>> hash
>>> type in Dovecot config.
>>>
>>> Any help appreciated.
>>>
>>>
>>> root at SSiS:/etc/postfix# dovecot --version
>>> 1.2.15
>>> root at SSiS:/etc/postfix# dovecot -n
>>> # 1.2.15: /etc/dovecot/dovecot.conf
>>> # OS: Linux 2.6.32-12-pve i686 Debian 6.0.7 simfs
>>> log_timestamp: %Y-%m-%d %H:%M:%S
>>> login_dir: /var/run/dovecot/login
>>> login_executable: /usr/lib/dovecot/imap-login
>>> mail_privileged_group: mail
>>> mail_location: maildir:/home/vmail/
>>> mbox_write_locks: fcntl dotlock
>>> auth default:
>>>     verbose: yes
>>>     debug: yes
>>>     debug_passwords: yes
>>>     passdb:
>>>       driver: pam
>>>     passdb:
>>>       driver: sql
>>>       args: /etc/dovecot/dovecot-sql.conf
>>>     userdb:
>>>       driver: passwd
>>> root at SSiS:/etc/postfix#
>>> root at SSiS:/etc/postfix# grep -v '^ *\(#.*\)\?$'
>>> /etc/dovecot/dovecot-sql.conf
>>> driver = mysql
>>> connect = host=127.0.0.1 dbname=Drupal user=Dru_Adm password=localu
>>> default_pass_scheme = CRYPT
>>> password_query = SELECT name AS user, pass AS password FROM users WHERE
>>> name='%n'
>>> user_query = SELECT
>>> CONCAT(SUBSTRING_INDEX(mail,'@',-1),'/',SUBSTRING_INDEX(mail,'@',1),'/')
>>> AS
>>> mail FROM users WHERE name='%n'
>>> root at SSiS:/etc/postfix# tail /var/log/mail.log
>>> Mar 11 16:17:42 SSiS dovecot: auth(default): new auth connection:
>>> pid=8593
>>> Mar 11 16:17:51 SSiS dovecot: auth(default): client in:
>>>
> AUTH#0111#011PLAIN#011service=imap#011secured#011lip=127.0.0.1#011rip=127.0.0.1#011lport=143#011rport=52316#011resp=AFRlYWNoZXIxAFRlYWNoZXIx
>>> Mar 11 16:17:51 SSiS dovecot: auth-worker(default):
>>> pam(Teacher1,127.0.0.1): lookup service=dovecot
>>> Mar 11 16:17:51 SSiS dovecot: auth-worker(default):
>>> pam(Teacher1,127.0.0.1): #1/1 style=1 msg=Password:
>>> Mar 11 16:17:54 SSiS dovecot: auth-worker(default):
>>> pam(Teacher1,127.0.0.1): pam_authenticate() failed: Authentication
>>> failure
>>> (password mismatch?) (given password: Teacher1)
>>> Mar 11 16:17:54 SSiS dovecot: auth-worker(default):
>>> sql(Teacher1,127.0.0.1): query: SELECT name AS user, pass AS password
>>> FROM
>>> users WHERE name='Teacher1'
>>> Mar 11 16:17:54 SSiS dovecot: auth-worker(default):
>>> sql(Teacher1,127.0.0.1): Password mismatch
>>> Mar 11 16:17:54 SSiS dovecot: auth-worker(default):
> md5_verify(Teacher1):
>>> Not a valid MD5-CRYPT or PLAIN-MD5 password
>>> Mar 11 16:17:54 SSiS dovecot: auth-worker(default): Invalid OTP data in
>>> passdb
>>> Mar 11 16:17:54 SSiS dovecot: auth-worker(default): Invalid OTP data in
>>> passdb
>>> Mar 11 16:17:54 SSiS dovecot: auth-worker(default):
>>> sql(Teacher1,127.0.0.1): CRYPT(Teacher1) !=
>>> '$S$DZwJa.U8HXT2PvTmwCK13rGEYEvnx5DB6/hlqnfCBum4s4U7MVWU'
>>> Mar 11 16:17:56 SSiS dovecot: auth(default): client out:
>>> FAIL#0111#011user=Teacher1
>>> Mar 11 16:18:01 SSiS dovecot: imap-login: Disconnected: Too many invalid
>>> commands (auth failed, 1 attempts): user=<Teacher1>, method=PLAIN,
>>> rip=127.0.0.1, lip=127.0.0.1, secured
>>> Mar 11 16:32:36 SSiS dovecot: auth(default): new auth connection:
>>> pid=9075
>>> Mar 11 16:32:41 SSiS dovecot: imap-login: Disconnected: Too many invalid
>>> commands (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
>>> root at SSiS:/etc/postfix#
>>>
>>>
>> As far as I understand Drupal uses salted passwords, so you would need
>> to return the password + salt in the sql query.  I am not sure what
>> position the salt is offset for a password with Drupal, but that should
>> be simple to determine looking at the source.
This is not going to work via SQL query unfortunately.  Another option 
would be to modify Drupal to also save a copy of the password in another 
table which could be used for Dovecot.  This module might be what you're 
looking for http://drupal.org/project/cryptpw.  It creates a table of 
user information that has a CRYPT password, which dovecot could use for 
authentication.