courierpassd [-hV] [-s SERVICE] [--stderr]
courierpassd -s, --service SERVICE
courierpassd -h, --help
courierpassd -V, --version
courierpassd uses the poppassd protocol for obtaining authentication tokens from the network. courierpassd is intended to be run from a super-server such as tcpserver or xinetd.
The service specified by the -s switch will depend on the particular authentication modules installed. Often 'login' will be appropriate but other possibilities include 'imap' and 'pop3'. This value defaults to 'login'. See the Courier documentation for a further explanation of this switch.
The minimum uid that courierpassd will attempt to change a password for can be set at compile time using the configure option --with-minuid. courierpassd will refuse to change the password of a user whose uid is below this value. The default value is 100. This value should never be set to 0 as this would allow root's password to be changed from a remote location.
A second configure option, --with-badpassdelay, can be used to set the delay in seconds that courierpassd sleeps after an unsuccessful password change attempt. This feature is designed to make brute force attacks against passwords harder to perform. The default value is 3.
courierpassd does certain checks on command line arguments so it is important to put --stderr first in the argument list if it is to be used in order for these checks to be logged properly.
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
200 courierpassd 1.1.2 hello, who are you?\r\n
200 Your password please.\r\n
pass <current password>
200 Your new password please.\r\n
newpass <new password>\r\n
200 Password changed, thank-you.\r\n
Connection closed by foreign host.
If you've found a bug in courierpassd, please report it to firstname.lastname@example.org
courierpassd was written by Andrew St. Jean
Courier authentication library was written by Sam Varshavchik
poppassd was written by Pawel Krawczyk based on an ealier version written by John Norstad, Roy Smith and Daniel L. Leavitt