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#!/bin/sh
# cerberus-logging – Log-in logging extension for cerberus
#
# Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Login username, client hostname if non-local, ttyname, cerberus-hook and PID
username=
hostname=
ttyname="$(tty <&2 | cut -d / -f 1,2 --complement)"
hook="${1}"
pid=$PPID
if [ ! "${LOGIN_PID}" = "" ]; then
pid="${LOGIN_PID}"
fi
# Remove the hookname from $@
shift 1
# Parse the command line, excluding the hookname
# This is the arguments cerberus was spawned with
hostname_on_next=0
dash=0
for arg in "$@"; do
if [ "${arg}" = "" ]; then
true
elif [ "${arg::1}" = "-" ] && [ ${dash} = 0 ]; then
arg="${arg:1}"
while [ ! "${arg}" = "" ]; do
c="${arg::1}"
arg="${arg:1}"
if [ "${c}" = "h" ]; then # hostname
if [ ! "${arg}" = "" ]; then
hostname="${arg}"
else
hostname_on_next=1
fi
break
elif [ "${c}" = "f" ]; then # force
if [ ! "${arg}" = "" ]; then
username="${arg}"
fi
break
elif [ "${c}" = "-" ]; then # username
dash=1
break
fi
done
elif [ ${hostname_on_next} = 1 ]; then
hostname="${arg}"
hostname_on_next=0
else
username="${arg}"
fi
done
user="${username}"
# Execute a program only if it exists
try ()
{
if hash "${1}" 2>/dev/null; then
"$@"
fi
}
# Call logging programs (those that exists) for a successful login action
log_login ()
{
# This is useful if you want to print the last logging.
# log-login-lastlog updates the entry in lastlog so it is helpful
# to be able to print the log entry before the is updated. Its lets
# you add a script named .prelogin in your home directory that
# contains the following code, to print the last login information:
# echo 'Last login:' ; lastlog --user $USER | tail -n 1
script="$(getent passwd | grep '^${user}:' | cut -d : -f 6)/.prelogin"
if [ -x "${script}" ]; then
su -c "${script}" -- "${user}"
fi
try log-login-utmp "$@"
try log-login-audit "$@"
try log-login-lastlog "$@"
try log-login-syslog "$@"
}
# Call logging programs (those that exists) for a logout action
log_logout ()
{
true
}
# Call logging programs (those that exists) for a failed login action
log_denied ()
{
try log-login-btmp "$@"
try log-login-audit "$@"
}
# Figure out the actionname
action="${hook}"
if [ "${hook}" = denied ]; then
action=fail
fi
# Preprend options to values
action=--action="${action}"
username=--username="${username}"
ttyname=--ttyname="${ttyname}"
pid=--pid="${pid}"
# Call the logging programs
if [ "${hostname}" = "" ]; then
"log_${hook}" "${action}" "${username}" "${ttyname}" "${pid}"
else
"log_${hook}" "${action}" "${username}" "${ttyname}" "${pid}" --hostname="${hostname}"
fi
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