[Dovecot] [checkpassword] I can't get a password from fd3

[Durk Strooisma]

Hi all,

I'm trying to implement checkpassword authentication with a simple bash
script. In some way I can't get the password from file descriptor 3.

The start of script looks like this:

#!/bin/bash

read -d '\0' -r -u 3

USERNAME="${REPLY}"

read -d '\0' -r -u 3

PASSWORD="${REPLY}"

if [ -z "${USERNAME}" ] || [ -z "${PASSWORD}" ]
then
  exit 111
fi

It always exits with 111, because PASSWORD is empty. In whatever way I try
to retrieve data from fd3, I never happen to get more data than the username.

Is this a known problem? Am I doing something silly? Replies are much
appreciated!

Durk

FYI: GSSAPI auth works perfect and PAM worked before switching to
checkpassword too.

OS version      : Debian 5.0 lenny amd64
Dovecot version : 1.0.15 (Debian version 1.0.15-2.3)

Parts of /etc/dovecot/dovecot.conf:

protocols: imap
ssl_cert_file: /etc/ssl/certs/cert.pem
ssl_key_file: /etc/ssl/private/cert.key
ssl_cipher_list: ALL:!LOW:!SSLv2
login_dir: /var/run/dovecot/login
login_executable: /usr/lib/dovecot/imap-login
first_valid_uid: 998
last_valid_uid: 998
first_valid_gid: 998
last_valid_gid: 998
mail_privileged_group: mail
mail_location: maildir:/srv/vmail/%Ld/%n
lock_method: flock
maildir_copy_with_hardlinks: yes
auth default:
  mechanisms: gssapi plain
  krb5_keytab: /etc/dovecot/krb5.keytab
  verbose: yes
  debug: yes
  passdb:
    driver: checkpassword
    args: /usr/bin/dovecot-checkpassword
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf