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