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import boto3 | |
import certbot.main | |
import datetime | |
import os | |
import raven | |
import subprocess | |
def read_and_delete_file(path): | |
with open(path, 'r') as file: | |
contents = file.read() | |
os.remove(path) | |
return contents | |
def provision_cert(email, domains): | |
certbot.main.main([ | |
'certonly', # Obtain a cert but don't install it | |
'-n', # Run in non-interactive mode | |
'--agree-tos', # Agree to the terms of service, | |
'--email', email, # Email | |
'--dns-route53', # Use dns challenge with route53 | |
'-d', domains, # Domains to provision certs for | |
# Override directory paths so script doesn't have to be run as root | |
'--config-dir', '/tmp/config-dir/', | |
'--work-dir', '/tmp/work-dir/', | |
'--logs-dir', '/tmp/logs-dir/', | |
]) | |
first_domain = domains.split(',')[0] | |
path = '/tmp/config-dir/live/' + first_domain + '/' | |
return { | |
'certificate': read_and_delete_file(path + 'cert.pem'), | |
'private_key': read_and_delete_file(path + 'privkey.pem'), | |
'certificate_chain': read_and_delete_file(path + 'chain.pem') | |
} | |
def should_provision(domains): | |
existing_cert = find_existing_cert(domains) | |
if existing_cert: | |
now = datetime.datetime.now(datetime.timezone.utc) | |
not_after = existing_cert['Certificate']['NotAfter'] | |
return (not_after - now).days <= 30 | |
else: | |
return True | |
def find_existing_cert(domains): | |
domains = frozenset(domains.split(',')) | |
client = boto3.client('acm') | |
paginator = client.get_paginator('list_certificates') | |
iterator = paginator.paginate(PaginationConfig={'MaxItems':1000}) | |
for page in iterator: | |
for cert in page['CertificateSummaryList']: | |
cert = client.describe_certificate(CertificateArn=cert['CertificateArn']) | |
sans = frozenset(cert['Certificate']['SubjectAlternativeNames']) | |
if sans.issubset(domains): | |
return cert | |
return None | |
def notify_via_sns(topic_arn, domains, certificate): | |
process = subprocess.Popen(['openssl', 'x509', '-noout', '-text'], | |
stdin=subprocess.PIPE, stdout=subprocess.PIPE, encoding='utf8') | |
stdout, stderr = process.communicate(certificate) | |
client = boto3.client('sns') | |
client.publish(TopicArn=topic_arn, | |
Subject='Issued new LetsEncrypt certificate', | |
Message='Issued new certificates for domains: ' + domains + '\n\n' + stdout, | |
) | |
def upload_cert_to_acm(cert, domains): | |
existing_cert = find_existing_cert(domains) | |
certificate_arn = existing_cert['Certificate']['CertificateArn'] if existing_cert else None | |
client = boto3.client('acm') | |
acm_response = client.import_certificate( | |
CertificateArn=certificate_arn, | |
Certificate=cert['certificate'], | |
PrivateKey=cert['private_key'], | |
CertificateChain=cert['certificate_chain'] | |
) | |
return None if certificate_arn else acm_response['CertificateArn'] | |
def handler(event, context): | |
try: | |
domains = os.environ['LETSENCRYPT_DOMAINS'] | |
if should_provision(domains): | |
cert = provision_cert(os.environ['LETSENCRYPT_EMAIL'], domains) | |
upload_cert_to_acm(cert, domains) | |
notify_via_sns(os.environ['NOTIFICATION_SNS_ARN'], domains, cert['certificate']) | |
except: | |
client = raven.Client(os.environ['SENTRY_DSN'], transport=raven.transport.http.HTTPTransport) | |
client.captureException() | |
raise |
Hi,
I am referring above main.py
in my lambda function running version 3.8 however, I am getting below error;
Unable to import module 'lambda_function': No module named 'certbot'
I don't see any python library with name certbot
.
Hi,
I am referring above
main.py
in my lambda function running version 3.8 however, I am getting below error;
Unable to import module 'lambda_function': No module named 'certbot'
I don't see any python library with name
certbot
.
That library isn't available by default in the lambda runtime. You need to create a deployment package with all the required libraries.
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Thank you for this. I believe the latest version of boto3 requires the omission of the "CerticiateArn" keyword for a new cert:
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/acm.html#ACM.Client.import_certificate
I made the change here: https://gist.github.com/gb1035/3910200ee9fa580d34e69d7d8d043d44