Some time ago I posted ISP nstyle configuration C011 and continue
to get mails of the form:
> But can you please explain me how do the clients get their
> email if it's placed in many directories and the password
> are stored in "private" passwd files. The popper is not able
> to understand it. What approach do you use?
The way I approach this is as follows:
Our domains each have a unique last number from their IP address
in the form x.y.z.222 etc. but a simple serial number would do.
We prefix this domain number with an 'm' because it's a bad thing
to create a username that starts with a digit. The 'm' stands for
nothing special - originally I think it meant mail.
As a result we get a username of the form m222.dwalker
We now use the shell script attached to create the user, setup
symbolic links from /var/spool/mail/m222.dwalker to the users
account directory etc. This is either called from a web page via
ssl or an ssh login
Therefore mail sent to dwalker@??? will be accessable
from a pop or imap account called m222.dwalker and uniqueness
across multiple domains is preserved.#!/bin/ksh -
PATH=${PATH}:/usr/sbin; export PATH
# General Configuration
export PROGNAME=`basename $0`
export POPGID=198
export SHELL=/bin/false
export SYSPASS=/etc/passwd
export SYSSHAD=/etc/shadow
export PREFIX=m
# Global Parameters
export DOMAIN=""
export DOMGID=""
export DOMPASS=""
export DOMROOT=""
export DOMUID=""
export DOMUSER=""
export HOMEDIR=""
export MAILBOX=""
export MAILLNK=""
export POPUSER=""
export STRNGTST=""
fn_check_exit()
{
ESTATUS=$1
if [ "${ESTATUS}" != 0 ]
then
echo "Command exited with non-zero value (${ESTATUS})"
exit ${ESTATUS}
else
echo "Command successful"
fi
}
fn_getdomain()
{
DOMUID=$(id -u ${USER})
DOMGRP=${USER}
. getdomain ${DOMGRP}
# Derived Variables
DOMROOT=/monza/clients/${DOMAIN}
POPUSER=${PREFIX}${DOMUID}.${DOMUSER}
DOMGID=${DOMUID}
DOMPASS=${DOMROOT}/etc/passwd
HOMEDIR=${DOMROOT}/users/${DOMUSER}
MAILBOX=${DOMROOT}/mail/${DOMUSER}
MAILLNK=/var/spool/mail/${POPUSER}
}
fn_mkpasswd()
{
STRNGTST=`grep "^${POPUSER}:" ${SYSPASS}`
if [ -z "${STRNGTST}" ]
then
echo "Making ${SYSPASS} entry"
useradd -u ${DOMUID} -g ${DOMGRP} -d ${HOMEDIR} -s ${SHELL} -m -n ${POPUSER}
fn_check_exit $?
#echo "${POPUSER}:x:${DOMUID}:${POPGID}::${HOMEDIR}:${SHELL}" >> ${SYSPASS}
else
echo "User ${POPUSER} already in ${SYSPASS}"
fi
}
fn_mkdomuser()
{
STRNGTST=`grep "^${DOMUSER}:" ${DOMPASS}`
if [ -z "${STRNGTST}" ]
then
echo "Making ${DOMPASS} entry"
echo "${DOMUSER}:x:${DOMUID}:${DOMGID}::${HOMEDIR}:" >> ${DOMPASS}
else
echo "User ${DOMUSER} already in ${DOMPASS}"
fi
}
fn_mkmaildir()
{
if [ ! -e ${HOMEDIR}/mail ]
then
echo "Making ${HOMEDIR}/mail"
mkdir ${HOMEDIR}/mail
fn_check_exit $?
echo "Setting permissions on ${HOMEDIR}"
chown ${DOMUID}:${DOMGID} ${HOMEDIR}
fn_check_exit $?
fi
}
fn_creatembox()
{
if [ ! -e ${MAILBOX} ]
then
echo "Creating empty mailbox"
touch ${MAILBOX}
fn_check_exit $?
fi
echo "Setting ownership"
chown ${DOMUID}.mail ${MAILBOX}
fn_check_exit $?
echo "Setting permissions"
chmod 660 ${MAILBOX}
fn_check_exit $?
}
fn_dellink()
{
if [ -e ${MAILLNK} ]
then
if [ -L ${MAILLNK} ]
then
echo "Removing old link"
rm ${MAILLNK}
fn_check_exit $?
else
echo "${MAILLNK} is not a link - moving to .old"
mv ${MAILLNK} ${MAILLNK}.old
fn_check_exit $?
fi
fi
}
fn_mklink()
{
if [ -e ${MAILLNK} ]
then
if [ -L ${MAILLNK} ]
then
echo "Removing old link"
rm ${MAILLNK}
fn_check_exit $?
else
echo "File ${MAILLNK} exists moving to .old"
mv ${MAILLNK} ${MAILLNK}.old
fn_check_exit $?
fi
fi
echo "Creating a new link"
ln -s ${MAILBOX} ${MAILLNK}
fn_check_exit $?
}
fn_setpasswd()
{
echo "Set password for ${DOMUSER}"
passwd ${POPUSER}
fn_check_exit $?
}
fn_delpopuser()
{
fn_getdomain
fn_delpass
fn_dellink
echo ""
echo "Pop account deleted for ${POPUSER}"
echo "Files in the domain user and mail directories must be deleted manually"
echo "The entry in the domain passwd file is also redundant"
echo ""
}
fn_connect()
{
echo ""
echo "E-Mail Address: ${DOMUSER}@${DOMAIN}"
echo "Pop username: ${POPUSER}"
echo "Pop password: ********"
echo "Inbound mail: mail.${DOMAIN}"
echo "Inbound port: 110"
echo "Outbound mail: mail.${DOMAIN}"
echo "Outbound mail: 25"
echo ""
}
fn_addpopuser()
{
fn_getdomain
fn_mkpasswd
fn_mkmaildir
fn_mkdomuser
fn_creatembox
fn_mklink
fn_setpasswd
fn_connect
}
fn_setuserpass()
{
fn_getdomain
fn_setpasswd
fn_connect
}
fn_usage()
{
echo "Usage: ${PROGNAME} -a username [add a user]"
echo " ${PROGNAME} -c username [change a users password]"
echo " ${PROGNAME} -d username [delete a user]"
echo " ${PROGNAME} -l [lists all user]"
echo ""
echo "There is also a -n option to set the prefix to null rather"
echo "than m for backward compatiblity with earlier versions"
echo "Note: -n must proceed any other parameters"
exit 1
}
fn_delpass()
{
STRNGTST=`grep "^${POPUSER}:" ${SYSPASS}`
if [ -n "${STRNGTST}" ]
then
userdel ${POPUSER}
fn_check_exit $?
else
echo "User ${POPUSER} already deleted from ${SYSPASS}"
fi
}
fn_listpops()
{
fn_getdomain
echo "Username\t/etc/passwd\t/etc/shadow\tLocal Password"
for POPUSER in `grep "^${PREFIX}${DOMUID}\." ${SYSPASS} | cut -d: -f1 -s`
do
echo "${POPUSER}\tOK\t\t\c"
OKS=`grep "^${POPUSER}:" ${SYSSHAD}`
if [ -n "${OKS}" ]
then
echo "OK\t\t\c"
else
echo "Bad\t\t\c"
fi
DUS=`echo ${POPUSER} | cut -d"." -f2 -s`
OKD=`grep "^${DUS}:" ${DOMPASS}`
if [ -n "${OKD}" ]
then
echo "OK\t\c"
else
echo "Bad\t\c"
fi
echo ""
done
}
DONE=""
while getopts a:c:d:ln PARAM
do
case ${PARAM} in
a) DOMUSER=${OPTARG}
fn_addpopuser
DONE=TRUE
;;
c) DOMUSER=${OPTARG}
fn_setuserpass
DONE=TRUE
;;
d) DOMUSER=${OPTARG}
fn_delpopuser
DONE=TRUE
;;
l) fn_listpops
DONE=TRUE
;;
n) PREFIX=""
POPUSER=${PREFIX}${DOMUID}.${DOMUSER}
;;
?) fn_usage
esac
done
shift $(($OPTIND -1))
if [ -z "${DONE}" ]
then
fn_usage
fi
