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|
#!/bin/bash
# notifypwexp - send mail to users whose passwords are expiring soon
# designed to be run daily or weekly from cron
# original code by Dennis Williamson
# modified by Georg Pfuetzenreuter <georg@lysergic.dev>
# ### SETUP ###
#for weekly cron:
weekmode=7
#for daily cron:
#weekmode=0
debug=false
admins="system"
declare -r aged=21 # minimum days after expiration before admins are emailed, set to 0 for "always"
hostname=`hostname --fqdn`
# /etc/shadow is system dependent
shadowfile="/etc/shadow"
# fields in /etc/shadow
declare -r last=2
#declare -r may=3 # not used in this script
declare -r must=4
declare -r warn=5
#declare -r grace=6 # not used in this script
declare -r disable=7
declare -r doesntmust=99999
declare -r warndefault=7
passwdfile="/etc/passwd"
declare -r uidfield=3
declare -r unamefield=1
# UID range is system dependent
declare -r uidmin=1000
declare -r uidmax=65534 # exclusive
# remove the hardcoded path from these progs to use them via $PATH
# mailx is system dependent
notifyprog="/bin/mail"
grepprog="/bin/grep"
awkprog="/usr/bin/awk"
dateprog="/bin/date"
# comment out one of these
#useUTC=""
useUTC="-u"
# +%s is a GNUism - set it to blank and use dateformat if you have
# a system that uses something else like epochdays, for example
epochseconds="+%s"
dateformat="" # blank for GNU when epochseconds="+%s"
secondsperday=86400 # set this to 1 for no division
#secondsperday=1
today=$(($($dateprog $useUTC $epochseconds $dateformat)/$secondsperday))
if [ "$debug" = true ]; then
echo "today: $today"
fi
oIFS=$IFS
# ### END SETUP ###
# ### MAIL TEMPLATES ###
# use single quotes around templates, backslash escapes and substitutions
# will be evaluated upon output
usersubjecttemplate='Your password is expiring soon'
gentemplate_userbody () {
local days="$1"
userbodytemplate="Your password on $hostname expires in $days days."
}
adminsubjecttemplate='User Password Expired: $user@$hostname'
adminbodytemplate='The password for user $user on $hostname expired $age days ago.
Please contact this user about their inactive account and consider whether
the account should be disabled or deleted.'
# ### END MAIL TEMPLATES ###
# get real users
users=$($awkprog -F: -v uidfield=$uidfield \
-v unamefield=$unamefield \
-v uidmin=$uidmin \
-v uidmax=$uidmax \
-- '$uidfield>=uidmin && $uidfield<uidmax \
{print $unamefield}' $passwdfile)
for user in $users;
do
if [ "$debug" = true ]; then
echo "user: $user"
fi
IFS=":"
usershadow=$($grepprog ^$user $shadowfile)
if [ "$debug" = true ]; then
echo "usershadow 1: $usershadow"
fi
# make an array out of it
usershadow=($usershadow)
if [ "$debug" = true ]; then
echo "usershadow 2: $usershadow"
fi
IFS=$oIFS
mustchange=${usershadow[$must]}
if [ "$debug" = true ]; then
echo "mustchange: $mustchange"
fi
disabledate=${usershadow[$disable]:-$doesntmust}
if [ "$debug" = true ]; then
echo "disabledate: $disabledate"
fi
# skip users that aren't expiring or that are disabled
if [[ $mustchange -ge $doesntmust || $disabledate -le $today ]] ; then continue; fi;
lastchange=${usershadow[$last]}
if [ "$debug" = true ]; then
echo "lastchange: $lastchange"
fi
warndays=${usershadow[$warn]:-$warndefault}
if [ "$debug" = true ]; then
echo "warndays: $warndays"
fi
expdate=$(("$lastchange" + "$mustchange"))
if [ "$debug" = true ]; then
echo "expdate: $expdate"
fi
threshhold=$(($today + $warndays + $weekmode))
if [ "$debug" = true ]; then
echo "threshhold: $treshhold"
fi
if [[ $expdate -lt $threshhold ]];
then
gentemplate_userbody "$(($expdate - $today))"
if [[ $expdate -ge $today ]];
then
subject=$(eval "echo \"$usersubjecttemplate\"")
body=$(eval "echo \"$userbodytemplate\"")
echo -e "$body" | $notifyprog -s "$subject" $user
else
if [[ $age -ge $aged ]];
then
subject=$(eval "echo \"$adminsubjecttemplate\"")
body=$(eval "echo \"$adminbodytemplate\"")
echo -e "$body" | $notifyprog -s "$subject" $admins
fi
fi
fi
done
unset debug
|
