#!/bin/bash
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

PROPS_FILE="$1"
KS_FILE="$2"
KS_PASS="$3"
KS_VALIDITY="$4"
CSR_FILE="$5"

ALIAS="cloud"
LIBVIRTD_FILE="/etc/libvirt/libvirtd.conf"

if type -p logger > /dev/null; then
    LOGGER_CMD="$(type -p logger) -t cloudstack-keystore-setup"
else
    LOG_FILE="/var/log/cloudstack/agent/cloudstack-keystore-setup.log"
    log() {
        if [ "${1}" != "" ]; then
            __log_line="${1}"
        else
            read -r __log_line
        fi

        echo "${__log_line}" >> "${LOG_FILE}"
        echo "${__log_line}"
    }
    LOGGER_CMD=log
fi

$LOGGER_CMD "$(date) - starting keystore-setup"

# Re-use existing password or use the one provided
if [ -f "$PROPS_FILE" ]; then
    $LOGGER_CMD "Previous props file exists, trying to extract password"
    OLD_PASS=$(sed -n '/^keystore.passphrase/p' "$PROPS_FILE" | sed 's/^keystore.passphrase=//g')
    if [ -n "${OLD_PASS// }" ]; then
        KS_PASS="$OLD_PASS"
        $LOGGER_CMD "Password extraction successful"
    else
        sed -i "/^keystore.passphrase.*/d" "$PROPS_FILE" 2>&1 | $LOGGER_CMD || true
        echo "keystore.passphrase=$KS_PASS" >> "$PROPS_FILE"
        if [ $? != 0 ]; then
                $LOGGER_CMD "Could not add new password to agent.properties"
        else
                $LOGGER_CMD "New keystore password set"
        fi
    fi
fi

if [ -f "$KS_FILE" ]; then
    $LOGGER_CMD "keystore file exists. Deleting current entries"
    keytool -delete -noprompt -alias "$ALIAS" -keystore "$KS_FILE" -storepass "$KS_PASS" 2>&1 | $LOGGER_CMD
    [ $? -ne 0 ] && $LOGGER_CMD "Failed to delete current entries"
fi

$LOGGER_CMD "Generating new key"
CN=$(hostname --fqdn)
keytool -genkey -storepass "$KS_PASS" -keypass "$KS_PASS" -alias "$ALIAS" -keyalg RSA -validity "$KS_VALIDITY" -dname cn="$CN",ou="cloudstack",o="cloudstack",c="cloudstack" -keystore "$KS_FILE" 2>&1 | $LOGGER_CMD

# Generate CSR
$LOGGER_CMD "Generating CSR"
[ -f "$CSR_FILE" ] && rm -f "$CSR_FILE"
addresses=$(ip address | grep inet | awk '{print $2}' | sed 's/\/.*//g' | grep -v '^169.254.' | grep -v '^127.0.0.1' | grep -E -v '^::1|^fe80' | grep -v '^::1' | sed 's/^/ip:/g' | tr '\r\n' ',')
$LOGGER_CMD "Found following SAN addresses to add to CSR: ${addresses}"
keytool -certreq -storepass "$KS_PASS" -alias "$ALIAS" -file "$CSR_FILE" -keystore "$KS_FILE" -ext san="$addresses" 2>&1 | $LOGGER_CMD
if [ $? -ne 0 ];then
    $LOGGER_CMD "Failed to generate CSR file, retrying after removing existing settings"

    if [ -f "$LIBVIRTD_FILE" ]; then
        $LOGGER_CMD "Reverting libvirtd to not listen on TLS"
        sed -i "s,^listen_tls=1,listen_tls=0,g" $LIBVIRTD_FILE
        systemctl restart libvirtd
    fi

    $LOGGER_CMD "Removing cloud.* files in /etc/cloudstack/agent"
    rm -f /etc/cloudstack/agent/cloud.* || $LOGGER_CMD "Could not remove /etc/cloudstack/agent/cloud.*"

    $LOGGER_CMD "Retrying to generate CSR file"
    keytool -certreq -storepass "$KS_PASS" -alias "$ALIAS" -file "$CSR_FILE" -keystore "$KS_FILE" -ext san="$addresses" 2>&1 | $LOGGER_CMD
    if [ $? -ne 0 ];then
        $LOGGER_CMD "Failed to generate CSR file while retrying"
        exit 1
    fi
fi

cat "$CSR_FILE"

# Fix file permissions
chmod 600 "$KS_FILE" || $LOGGER_CMD "Cannot chmod $KS_FILE"
chmod 600 "$PROPS_FILE" || $LOGGER_CMD "Cannot chmod $PROPS_FILE"
chmod 600 "$CSR_FILE" || $LOGGER_CMD "Cannot chmod $CSR_FILE"