#!/bin/bash -e
#
# freeipa-service-password.sh - add/set host service login password
#
# Version 1.0, latest version, documentation and bugtracker available at:
#		https://gitlab.lindenaar.net/scripts/freeipa
#
# Copyright (c) 2019 Frederik Lindenaar
#
# This script is free software: you can redistribute and/or modify it under the
# terms of version 3 of the GNU General Public License as published by the Free
# Software Foundation, or (at your option) any later version of the license.
#
# This script 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, visit <http://www.gnu.org/licenses/> to download it.

die() { echo $* >&2; exit 1; }

# Exit if hostname not provided
if [ $# -lt 2 ]; then
    die "Usage: `basename $0` <hostname> <service> [<service> ...]"
fi

# Sanity checks, ensure we have a valid Kerberos ticket and run on FreeIPA server
if ! klist -s; then
    die "no valid Kerberos ticket, please login to FreeIPA using kinit first"
elif ! ipa server-show ${HOSTNAME:=$(hostname --fqdn)} > /dev/null; then
    die "this script should be run on an active IPA server"
fi

# Set parameters from command line
: ${HOST:=$1}
shift

if ! ipa host-show "$HOST" > /dev/null 2>&1; then
    echo Fetching information for $HOST
    SSHKEYS=($(ssh-keyscan $HOST 2>/dev/null | cut -f2- -d\  | sed "s/\(.*\)/--sshpubkey='\1'/"))
    echo Creating host $HOST
    eval ipa host-add "$HOST" ${SSHKEYS[@]}
    eval ipa host-add-principal "$HOST" $HOSTALIASES
else
    echo host $HOST exists
fi


for service in $*
do
    if ipa service-add "$service/$HOST" > /dev/null 2>&1; then
        echo Created service $service/$HOST
    else
        echo service $service/$HOST exists
    fi
    service_binddn=$(ipa service-show "$service/$HOST" --raw --all | fgrep " dn: " | cut -f2 -d: | tr -d \ )
    echo Service Bind DN: $service_binddn
    service_bindpw=$(pwmake 128)
    if ipa service-show "$service/$HOST" --all --raw | fgrep "objectClass:" | fgrep -q "simpleSecurityObject" > /dev/null 2>&1; then
        echo resetting password to generated password: $service_bindpw
        ldapmodify -Q > /dev/null 2>&1 <<EOLDIF
dn: $service_binddn
changetype: modify
replace: userPassword
userPassword: $service_bindpw
EOLDIF
    else
        echo Enabled login with generated password: $service_bindpw
        ldapmodify -Q > /dev/null 2>&1 <<EOLDIF
dn: $service_binddn
changetype: modify
add: objectClass
objectClass: simpleSecurityObject
-
add: userPassword
userPassword: $service_bindpw
EOLDIF
    fi
done