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#!/bin/sh
# Distributed under the terms of the GNU General Public License (GPL) version 2.0
# based on Yuval Adam's route53.sh found at https://github.com/yuvadm/route53-ddns/blob/master/route53.sh
# 2017 Max Berger <max at berger dot name>
[ -z "${CURL_SSL}" ] && write_log 14 "Amazon AWS Route53 communication require cURL with SSL support. Please install"
[ -z "{$username}" ] && write_log 14 "Service section not configured correctly! Missing key as 'username'"
[ -z "${password}" ] && write_log 14 "Service section not configured correctly! Missing secret as 'password'"
[ -z "${domain}" ] && write_log 14 "Service section not configured correctly! Missing zone id as 'domain'"
ENDPOINT="route53.amazonaws.com"
RECORD_TTL=300
RECORD_NAME="${lookup_host}."
[ ${use_ipv6} -eq 0 ] && RECORD_TYPE="A"
[ ${use_ipv6} -eq 1 ] && RECORD_TYPE="AAAA"
RECORD_VALUE="${LOCAL_IP}"
HOSTED_ZONE_ID="${domain}"
API_PATH="/2013-04-01/hostedzone/${HOSTED_ZONE_ID}/rrset/"
AWS_ACCESS_KEY_ID="${username}"
AWS_SECRET_ACCESS_KEY="${password}"
AWS_REGION='us-east-1'
AWS_SERVICE='route53'
hash() {
msg="$1"
echo -en "${msg}" | openssl dgst -sha256 | sed 's/^.* //'
}
sign_plain() {
# Sign message using a plaintext key
key="$1"
msg="$2"
echo -en "${msg}" | openssl dgst -hex -sha256 -hmac "${key}" | sed 's/^.* //'
}
sign() {
# Sign message using a hex formatted key
key="$1"
msg="$2"
echo -en "${msg}" | openssl dgst -hex -sha256 -mac HMAC -macopt "hexkey:${key}" | sed 's/^.* //'
}
request_body="<?xml version=\"1.0\" encoding=\"UTF-8\"?> \
<ChangeResourceRecordSetsRequest xmlns=\"https://route53.amazonaws.com/doc/2013-04-01/\"> \
<ChangeBatch> \
<Changes> \
<Change> \
<Action>UPSERT</Action> \
<ResourceRecordSet> \
<Name>${RECORD_NAME}</Name> \
<Type>${RECORD_TYPE}</Type> \
<TTL>${RECORD_TTL}</TTL> \
<ResourceRecords> \
<ResourceRecord> \
<Value>${RECORD_VALUE}</Value> \
</ResourceRecord> \
</ResourceRecords> \
</ResourceRecordSet> \
</Change> \
</Changes> \
</ChangeBatch> \
</ChangeResourceRecordSetsRequest>"
fulldate="$(date --utc +%Y%m%dT%H%M%SZ)"
shortdate="$(date --utc +%Y%m%d)"
signed_headers="host;x-amz-date"
request_hash="$(hash "${request_body}")"
canonical_request="POST\n${API_PATH}\n\nhost:route53.amazonaws.com\nx-amz-date:${fulldate}\n\n${signed_headers}\n${request_hash}"
date_key="$(sign_plain "AWS4${AWS_SECRET_ACCESS_KEY}" "${shortdate}")"
region_key="$(sign "${date_key}" ${AWS_REGION})"
service_key="$(sign "${region_key}" ${AWS_SERVICE})"
signing_key="$(sign "${service_key}" aws4_request)"
credential="${shortdate}/${AWS_REGION}/${AWS_SERVICE}/aws4_request"
sigmsg="AWS4-HMAC-SHA256\n${fulldate}\n${credential}\n$(hash "${canonical_request}")"
signature="$(sign "${signing_key}" "${sigmsg}")"
authorization="AWS4-HMAC-SHA256 Credential=${AWS_ACCESS_KEY_ID}/${credential}, SignedHeaders=${signed_headers}, Signature=${signature}"
ANSWER="$(curl \
-X "POST" \
-H "Host: route53.amazonaws.com" \
-H "X-Amz-Date: ${fulldate}" \
-H "Authorization: ${authorization}" \
-H "Content-Type: text/xml" \
-d "$request_body" \
"https://${ENDPOINT}${API_PATH}")"
write_log 7 "${ANSWER}"
echo "${ANSWER}" | grep -F "Error" >/dev/null && return 1
echo "${ANSWER}" | grep -F "ChangeInfo" >/dev/null && return 0
return 2