checkpw with crypt password (patch)

[Chris Ruehl]

Dear All,

I like to submit you our patches applied to lib/checkpw.c lib/Makefile.am

The patches add crypt() compare for salted crypt password.
We use this to allow postfix using sasl read and validate crypt passwords
for a database table (postgres).

Tests are successful done on a Debian Wheezy with following configuration:

/etc/postfix/sasl/smtpd.conf
sasl_pwcheck_method: auxprop
sasl_auxprop_plugin: pgsql
password_format: crypt
mech_list: LOGIN PLAIN

sql_engine: pgsql
sql_user: postfix
sql_passwd: *********
sql_hostnames: localhost
sql_database: *******
sql_select: select cryptpw as password from mailacct where account='%u@%r'
sql_usessl: no


testmaildb=> SELECT id,account,cryptpw from mailacct where id=1
;
  id |        account       |              cryptpw
----+----------------------+------------------------------------
   1 | tester at testdom.local | $1$.wMUVvWa$cPWzm5.zHZAqgMBcEC7fA/
(1 row)


Please review the patch and submit it to your upstream releases.

happy new year !

Cheers
Chris
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