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#!/bin/bash
### route53.sh
### For use in LEDE / OpenWRT DDNS scenarios
###
### Requires: curl, openssl-util
set -euo pipefail
IFS=$'\n\t'
ENDPOINT="route53.amazonaws.com"
RECORD_TTL=300
#RECORD_NAME=""
RECORD_TYPE="A"
RECORD_VALUE="1.2.3.4"
#HOSTED_ZONE_ID=""
API_PATH="/2013-04-01/hostedzone/${HOSTED_ZONE_ID}/rrset/"
# AWS_ACCESS_KEY_ID=''
# AWS_SECRET_ACCESS_KEY=''
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.amazon.com\nx-amz-date:${fulldate}\n\n${signed_headers}\n${request_hash}"
echo "Canonical request:"
echo -e $canonical_request
echo
echo
date_key=$(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}"
echo 'Auth'
echo $authorization
echo
echo
curl \
-X "POST" \
-H "host:route53.amazonaws.com" \
-H "x-amz-date:${fulldate}" \
-H "authorization:${authorization}}" \
-H "Content-Type:text/xml;charset=UTF-8" \
-d "$request_body" \
"https://${ENDPOINT}${API_PATH}"
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