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01-rc-certificate.yaml
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01-rc-certificate.yaml
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# Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance with the License.
# A copy of the License is located at
# http://aws.amazon.com/apache2.0/
# or in the "license" file accompanying this file. This file 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.
AWSTemplateFormatVersion: 2010-09-09
Description: Request a DNS-validated ACM cert
Parameters:
R53HostedZoneId:
Type: AWS::Route53::HostedZone::Id
Description: >
The Route 53 hosted zone for the domains you are requesting a
certificate for.
R53DomainName:
Type: String
Description: >
Fully qualified domain name (FQDN), such as www.example.com,
that you want to secure with an ACM certificate.
AllowedPattern: '^(\*\.)?(((?!-)[A-Za-z0-9-]{0,62}[A-Za-z0-9])\.)+((?!-)[A-Za-z0-9-]{1,62}[A-Za-z0-9])$'
ConstraintDescription: >
The first domain name you enter cannot exceed 63 octets,
including periods. Each subsequent Subject Alternative Name
(SAN), however, can be up to 253 octets in length.
SubjectAlternativeNames:
Type: CommaDelimitedList
Description: >
Additional FQDNs to be included in the Subject Alternative Name
extension of the ACM certificate. The maximum number of domain
names that you can add to an ACM certificate is 100. However,
the initial limit is 10 domain names. The maximum length of a
SAN DNS name is 253 octets. The name is made up of multiple
labels separated by periods. No label can be longer than 63
octets.
Default: ''
Resources:
DNSValidatedCertificateResourceFunctionPolicy:
Type: AWS::IAM::ManagedPolicy
Properties:
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action:
- route53:ChangeResourceRecordSets
- route53:ListResourceRecordSets
Resource:
- !Sub 'arn:aws:route53:::hostedzone/${R53HostedZoneId}'
- Effect: Allow
Action:
- acm:DescribeCertificate
- acm:DeleteCertificate
- acm:RequestCertificate
Resource:
- '*'
DNSValidatedCertificateResourceFunctionRole:
Type: AWS::IAM::Role
Properties:
Path: '/'
ManagedPolicyArns:
- arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
- !Ref DNSValidatedCertificateResourceFunctionPolicy
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service: lambda.amazonaws.com
Action:
- sts:AssumeRole
DNSValidatedCertificateResourceFunction:
Type: AWS::Lambda::Function
Properties:
Code:
ZipFile: |
import boto3
import botocore.exceptions
import cfnresponse
import logging
import time
from contextlib import contextmanager
acm = boto3.client('acm')
route53 = boto3.client('route53')
logger = logging.getLogger()
logger.setLevel(logging.INFO)
@contextmanager
def suppress_boto_clienterror(*error_codes):
try:
yield
except botocore.exceptions.ClientError as e:
logger.exception(e)
if e.response['Error']['Code'] not in error_codes:
raise e
class ACMIssuanceError(Exception): pass
def get_validation_resource_records(certificate_arn):
for attempt in range(10):
cert_info = acm.describe_certificate(CertificateArn=certificate_arn)
try:
dvos = cert_info['Certificate']['DomainValidationOptions']
except KeyError:
logger.info('Waiting for validation records, attempt {}'.format(attempt+1))
time.sleep(10)
for attempt in range(10):
try:
return [dvo['ResourceRecord'] for dvo in dvos]
except KeyError:
logger.info('Waiting for validation records, attempt {}'.format(attempt+1))
time.sleep(10)
raise ACMIssuanceError('Timed out waiting for validation records')
def change_records(certificate_arn, hosted_zone_id, action):
for resource_record in get_validation_resource_records(certificate_arn):
logger.info('{}: {}'.format(action, resource_record['Name']))
route53.change_resource_record_sets(
HostedZoneId=hosted_zone_id,
ChangeBatch={
'Changes': [{
'Action': action,
'ResourceRecordSet': {
'Name': resource_record['Name'],
'Type': resource_record['Type'],
'TTL': 60,
'ResourceRecords': [{'Value': resource_record['Value']}]
}
}]
})
def wait_for_issuance(certificate_arn):
for attempt in range(15):
cert_info = acm.describe_certificate(CertificateArn=certificate_arn)
status = cert_info['Certificate']['Status']
if status == 'PENDING_VALIDATION':
logger.info('Waiting for issuance, attempt {}'.format(attempt+1))
time.sleep(20)
continue
if status == 'ISSUED':
logger.info('Certificate issued!')
return
raise ACMIssuanceError('Bad status "{}"'.format(status))
def lambda_handler(event, context):
responseData = {}
resource_id = event.get('PhysicalResourceId')
props = event['ResourceProperties']['Parameters']
try:
if event['RequestType'] == 'Delete':
with suppress_boto_clienterror('InvalidChangeBatch', 'ResourceNotFoundException'):
change_records(resource_id, props['HostedZoneId'], 'DELETE')
acm.delete_certificate(CertificateArn=resource_id)
else:
args = {
'DomainName': props['DomainName'],
'IdempotencyToken': context.aws_request_id.replace('-',''),
'ValidationMethod': 'DNS'
}
san_list = props.get('SubjectAlternativeNames')
if san_list:
args['SubjectAlternativeNames'] = san_list
logger.info(str(args))
resp = acm.request_certificate(**args)
logger.info(str(resp))
resource_id = resp['CertificateArn']
responseData['CertificateArn'] = resource_id
logger.info('Certificate requested: {}'.format(resource_id))
change_records(resource_id, props['HostedZoneId'], 'UPSERT')
wait_for_issuance(resource_id)
except Exception as e:
logger.exception(e)
cfnresponse.send(event, context, cfnresponse.FAILED, responseData, resource_id)
else:
cfnresponse.send(event, context, cfnresponse.SUCCESS, responseData, resource_id)
Handler: index.lambda_handler
Runtime: python3.6
Timeout: 300
Role: !GetAtt DNSValidatedCertificateResourceFunctionRole.Arn
Certificate:
Type: Custom::DNSValidatedCertificate
Properties:
ServiceToken: !GetAtt DNSValidatedCertificateResourceFunction.Arn
Parameters:
HostedZoneId: !Ref R53HostedZoneId
DomainName: !Ref R53DomainName
# SubjectAlternativeNames: !Ref SubjectAlternativeNames
Outputs:
CertificateArn:
Value: !GetAtt Certificate.CertificateArn