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#!/bin/bash
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# $Id: alcasar-ldap.sh 2714 2019-03-10 23:43:22Z tom.houdayer $
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# alcasar-ldap.sh
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# by Rexy
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# This script is distributed under the Gnu General Public License (GPL)
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# activation / d├ęsactivation de l'authentification des utilisateurs via un serveur LDAP externe
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# enable / disable authentication of users via an extern LDAP server
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usage="Usage: alcasar-ldap.sh {--on or -on } | {--off or -off} | --import-cert {certificatePath} | --test [-d]"
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SED="/bin/sed -i"
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CONF_FILE="/usr/local/etc/alcasar.conf"
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LDAP_MODULE="/etc/raddb/mods-available/ldap-alcasar"
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OPENLDAP_CONF='/etc/openldap/ldap.conf'
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LDAPS_CERT_LOC='/etc/raddb/certs/alcasar-ldaps.crt'
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LDAP_SERVER=$(grep '^LDAP_SERVER=' $CONF_FILE | cut -d"=" -f2)                # hostname/IP address of the LDAP server
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LDAP_USER=$(grep '^LDAP_USER=' $CONF_FILE | cut -d"=" -f2-)                   # LDAP username used by ALCASAR to read the remote directory
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LDAP_PASSWORD=$(grep '^LDAP_PASSWORD=' $CONF_FILE | cut -d"=" -f2-)           # its password
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LDAP_BASE=$(grep '^LDAP_BASE=' $CONF_FILE | cut -d"=" -f2-)                   # Where to find the users (cn=**,dc=**,dc=**)
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LDAP_UID=$(grep '^LDAP_UID=' $CONF_FILE | cut -d"=" -f2)                      # 'samaccountname' for A.D. - 'UID' for LDAP
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LDAP_FILTER=$(grep '^LDAP_FILTER=' $CONF_FILE | cut -d"=" -f2-)               # LDAP filter
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LDAP_SSL=$(grep '^LDAP_SSL=' $CONF_FILE | cut -d"=" -f2-)                     # LDAP SSL status
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LDAP_CERT_REQUIRED=$(grep '^LDAP_CERT_REQUIRED=' $CONF_FILE | cut -d"=" -f2-) # LDAP SSL certificate verifying
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nb_args=$#
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args=$1
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if [ $nb_args -eq 0 ]; then
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        nb_args=1
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        args="-h"
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fi
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case $args in
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        -\? | -h* | --h*)
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                echo "$usage"
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                exit 0
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                ;;
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        --on | -on)
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                $SED "s/^LDAP=.*/LDAP=on/g" $CONF_FILE
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                if [ "$LDAP_SSL" == 'on' ]; then
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                        $SED "s/^\tserver =.*/\tserver = \"ldaps:\/\/${LDAP_SERVER//\"/\\\\\\\"}\"/g" $LDAP_MODULE
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                        $SED "s/^\tport =.*/\tport = 636/g" $LDAP_MODULE
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                        [ "$LDAP_CERT_REQUIRED" == 'on' ] && require_cert='demand' || require_cert='never'
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                        $SED "s/^\t\t#?require_cert =.*/\t\trequire_cert = '$require_cert'/g" $LDAP_MODULE
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                        echo -e "TLS_CACERT $LDAPS_CERT_LOC\nTLS_REQCERT $require_cert" > $OPENLDAP_CONF
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                else
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                        $SED "s/^\tserver =.*/\tserver = \"ldap:\/\/${LDAP_SERVER//\"/\\\\\\\"}\"/g" $LDAP_MODULE
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                        $SED "s/^\tport =.*/\tport = 389/g" $LDAP_MODULE
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                        echo  '' > $OPENLDAP_CONF
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                fi
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                $SED "s/^\tidentity =.*/\tidentity = \"${LDAP_USER//\"/\\\\\\\"}\"/g" $LDAP_MODULE
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                $SED "s/^\tpassword =.*/\tpassword = \"${LDAP_PASSWORD//\"/\\\\\\\"}\"/g" $LDAP_MODULE
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                $SED "s/^\tbase_dn =.*/\tbase_dn = \"${LDAP_BASE//\"/\\\\\\\"}\"/g" $LDAP_MODULE
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                [ -n "$LDAP_FILTER" ] && filter="$LDAP_FILTER" || filter='&'
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                $SED "s/^\t\tfilter =.*/\t\tfilter = \"(\&(${LDAP_UID//\"/\\\\\\\"}=%{%{Stripped-User-Name}:-%{User-Name}})($filter))\"/g" $LDAP_MODULE
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                if [ ! -e /etc/raddb/mods-enabled/ldap ]; then
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                        ln -s $LDAP_MODULE /etc/raddb/mods-enabled/ldap
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                fi
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                [ -e /etc/raddb/sites-enabled/alcasar ] && rm /etc/raddb/sites-enabled/alcasar
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                ln -s /etc/raddb/sites-available/alcasar-with-ldap /etc/raddb/sites-enabled/alcasar
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                /usr/bin/systemctl restart radiusd.service
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                ;;
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        --off | -off)
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                $SED "s/^LDAP=.*/LDAP=off/g" $CONF_FILE
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                rm -f /etc/raddb/mods-enabled/ldap
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                [ -e /etc/raddb/sites-enabled/alcasar ] && rm /etc/raddb/sites-enabled/alcasar
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                ln -s /etc/raddb/sites-available/alcasar /etc/raddb/sites-enabled/alcasar
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                /usr/bin/systemctl restart radiusd.service
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                ;;
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        --import-cert)
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                cert=$2
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                [ -z "$cert" ] && echo "$usage" && exit 1
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                if [ "$LDAP_CERT_REQUIRED" == 'on' ]; then
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                        domainName=$(openssl x509 -noout -subject -in $LDAPS_CERT_LOC | cut -d' ' -f2- | sed 's@/[A-Za-z]\+=@\n@g' | tac | tr '\n' '.' | sed  's@\.\+$@@')
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                        if [ "$domainName" != "$LDAP_SERVER" ]; then
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                                echo 'WARN: the common name of the certificate is different from the server domain name'
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                        fi
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                fi
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                # TODO : convert DER format to PEM ?
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                cp -f "$cert" $LDAPS_CERT_LOC
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                chown root:radius $LDAPS_CERT_LOC
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                chmod 644 $LDAPS_CERT_LOC
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                $SED "s/^LDAP_SSL=.*/LDAP_SSL=on/g" $CONF_FILE
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                $SED "s/^\tserver =.*/\tserver = \"ldaps:\/\/${LDAP_SERVER//\"/\\\\\\\"}\"/g" $LDAP_MODULE
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                $SED "s/^\tport =.*/\tport = 636/g" $LDAP_MODULE
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                $SED "s@^#\?\t\tca_file =.*@\t\tca_file = $LDAPS_CERT_LOC@g" $LDAP_MODULE
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                [ "$LDAP_CERT_REQUIRED" == 'on' ] && require_cert='demand' || require_cert='never'
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                $SED "s/^#\?\t\trequire_cert =.*/\t\trequire_cert = '$require_cert'/g" $LDAP_MODULE
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                echo -e "TLS_CACERT $LDAPS_CERT_LOC\nTLS_REQCERT $require_cert" > $OPENLDAP_CONF
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                /usr/bin/systemctl restart radiusd.service
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                ;;
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        --delete-cert)
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                [ -f "$LDAPS_CERT_LOC" ] && rm -f $LDAPS_CERT_LOC
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                ;;
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        --test)
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                [ -n "$2" ] && [ "$2" == '-d' ] && debugOpt='-d229'
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                command -v ldapsearch &>/dev/null || { echo >&2 -e "ERR: ldapsearch is not installed\nrun 'dnf install openldap-clients'" ; exit 1; }
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                if [ "$LDAP_SSL" == 'on' ]; then
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                        protocol='ldaps'
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                        [ "$LDAP_CERT_REQUIRED" == 'on' ] && require_cert='demand' || require_cert='never'
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                        export LDAPTLS_REQCERT="$require_cert"
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                        [ -f "$LDAPS_CERT_LOC" ] && export LDAPTLS_CACERT="$LDAPS_CERT_LOC"
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                else
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                        protocol='ldap'
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                fi
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                [ -n "$LDAP_FILTER" ] && filter="$LDAP_FILTER" || filter='&'
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                /usr/bin/ldapsearch $debugOpt -LLL -H "$protocol://$LDAP_SERVER" -x -D "$LDAP_USER" -w "$LDAP_PASSWORD" -b "$LDAP_BASE" "(&($LDAP_UID=*)($filter))" 1.1
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                ;;
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        *)
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                echo "Argument inconnu : $1";
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                echo "$usage"
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                exit 1
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                ;;
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esac