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