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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 and cerberus-hook
username=
hostname=
ttyname="$(tty | cut -d / -f 1,2 --complement)"
hook="${1}"
# 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="${arg}"
fi
done
# Execute a program only if it exists
try ()
{
if hash "${1}" 2>/dev/null then
"$@"
fi
}
# Call logging programs (those that exists) for a successful login action
log-login ()
{
try log-login-utmp "$@"
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}"
# Call the logging programs
if [ "${hostname}" = "" ]; then
"log-${hook}" "${action}" "${username}" "${ttyname}"
else
"log-${hook}" "${action}" "${username}" "${ttyname}" --hostname="${hostname}"
fi
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