[Dovecot] Integrating with Drupal SQL db

Tue Mar 12 05:54:39 EET 2013

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.