get username and new password in a text file for password change

[shaveht]

Hi guys...
sorry for bad english
I've RC as imap webmail frontend for Exchange mail server
LDAP port is closed from RC sever (DMZ) to Exchange server. Because of this I can't use any patch that permit change password via LDAP.
To bypass this problem, i think to store username and new password of a user in a text file and schedule a script on exchange server that every x min:
- took this file from webmail server through pscp copy command
- chage password due a command like "dsquery user -upn | dsmod user -pwd "
- erase previous file

i think to use same interface of http://roundcubeforum.net/forum/index.php?topic=711.0 patch


How can i get these information in a text file when a user click on save?
thanks in advance.

PS: all other suggestions are welcome.