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""" Lambda function backing cloudformation certificate resource Post-minification, this module must be less than 4KiB. """ import copy import hashlib import json import logging import time from boto3 import client from botocore.exceptions import ClientError, ParamValidationError from botocore.vendored import requests logger = logging.getLogger() logger.setLevel(logging.INFO) log_info = logger.info log_exception = logger.exception json_dumps = json.dumps shallow_copy = copy.copy sleep = time.sleep def handler(event, c, /): """ Cloudformation custom resource handler :param event: lambda event payload :param c: lambda execution context """ get_remaining_time_in_millis = c.get_remaining_time_in_millis log_info(event) def request_cert(): """ Create a certificate This create an ACM certificate and update the event payload with the PhysicalResourceId. The certificate will not yet be issued. """ api_request = shallow_copy(props) for key in ['ServiceToken', 'Region', 'Tags', 'Route53RoleArn']: api_request.pop(key, None) if 'ValidationMethod' in props: if props['ValidationMethod'] == 'DNS': # Check that we have all the hosted zone information we need to validate # before we create the certificate for name in set([props['DomainName']] + props.get('SubjectAlternativeNames', [])): get_zone_for(name) del api_request['DomainValidationOptions'] event['PhysicalResourceId'] = acm.request_certificate( IdempotencyToken=i_token, **api_request )['CertificateArn'] add_tags() def delete_certificate(a): """ Delete a certificate Attempts to delete a certificate. :param str a: Arn of the certificate to delete """ while True: try: acm.delete_certificate(**{'CertificateArn': a}) return except ClientError as exception: log_exception('') err_code = exception.response['Error']['Code'] if err_code == 'ResourceInUseException': if get_remaining_time_in_millis() / 1000 < 30: raise sleep(5) continue if err_code in ['ResourceNotFoundException', 'ValidationException']: # If the arn is invalid, it didn't exist anyway. return raise except ParamValidationError: # invalid arn return def find_certificate(props): """ Find a certificate that belongs to this stack If the certificate is not found, returns None. :param dict props: The properties of the certificate to find :returns: The arn of the certificate :rtype: str or None """ for page in acm.get_paginator('list_certificates').paginate(): for certificate in page['CertificateSummaryList']: log_info(certificate) tags = {tag['Key']: tag['Value'] for tag in acm.list_tags_for_certificate(**{'CertificateArn': certificate['CertificateArn']})['Tags']} if (tags.get('cloudformation:' + 'logical-id') == event['LogicalResourceId'] and tags.get('cloudformation:' + 'stack-id') == event['StackId'] and tags.get('cloudformation:' + 'properties') == hash(props) ): return certificate['CertificateArn'] def reinvoke(): """ Reinvoke this lambda The time to issue a certificate may be more than the lambda can execute for. This reinvokes this lambda to continue waiting. If this lambda has itself been reinvoked, instead raise a RuntimeError. """ # Only Reinvoke once, which is a total of 30 minutes running if event.get('Reinvoked', False): raise RuntimeError('Certificate not issued in time') event['Reinvoked'] = True log_info(event) client('lambda').invoke( FunctionName=c.invoked_function_arn, InvocationType='Event', Payload=json_dumps(event).encode() ) def wait_for_issuance(): """ Wait until a certificate is issued Returns True when issued, False when lambda execution time is up. If the certificate fails to issue, a RuntimeError is raised :rtype: bool """ while (get_remaining_time_in_millis() / 1000) > 30: cert = acm.describe_certificate(**{'CertificateArn': event['PhysicalResourceId']})['Certificate'] log_info(cert) if cert['Status'] == 'ISSUED': return True elif cert['Status'] == 'FAILED': raise RuntimeError(cert.get('FailureReason', '')) sleep(5) return False def replace_cert(): """ Does the update require replacement of the certificate? Only tags can be updated without replacement :rtype: bool """ old = shallow_copy(event['Old' + 'ResourceProperties']) old.pop('Tags', None) new = shallow_copy(event['ResourceProperties']) new.pop('Tags', None) return old != new def validate(): """ Add DNS validation records for a certificate """ if 'ValidationMethod' in props and props['ValidationMethod'] == 'DNS': done = False while not done: done = True cert = acm.describe_certificate(**{'CertificateArn': event['PhysicalResourceId']})['Certificate'] log_info(cert) if cert['Status'] != 'PENDING_VALIDATION': return for validation_option in cert['DomainValidationOptions']: if 'ValidationStatus' not in validation_option or 'ResourceRecord' not in validation_option: done = False continue if validation_option['ValidationStatus'] == 'PENDING_VALIDATION': hosted_zone = get_zone_for(validation_option['DomainName']) role_arn = hosted_zone.get('Route53RoleArn', props.get('Route53RoleArn')) sts = client('sts').assume_role( RoleArn=role_arn, RoleSessionName=('Certificate' + event['LogicalResourceId'])[:64], DurationSeconds=900, )['Credentials'] if role_arn is not None else {} route53 = client('route53', aws_access_key_id=sts.get('AccessKeyId'), aws_secret_access_key=sts.get('SecretAccessKey'), aws_session_token=sts.get('SessionToken'), ).change_resource_record_sets(**{ 'HostedZoneId': hosted_zone['HostedZoneId'], 'ChangeBatch': { 'Comment': 'Domain validation for ' + event['PhysicalResourceId'], 'Changes': [{ 'Action': 'UPSERT', 'ResourceRecordSet': { 'Name': validation_option['ResourceRecord']['Name'], 'Type': validation_option['ResourceRecord']['Type'], 'TTL': 60, 'ResourceRecords': [{'Value': validation_option['ResourceRecord']['Value']}], }, }], }}, ) log_info(route53) sleep(1) def get_zone_for(n): """ Return the hosted zone to use for validating a name :param str n: The name to validate :rtype: dict """ n = n.rstrip('.') zones = {domain['DomainName'].rstrip('.'): domain for domain in props['DomainValidationOptions']} parts = n.split('.') while len(parts): if '.'.join(parts) in zones: return zones['.'.join(parts)] parts = parts[1:] raise RuntimeError('DomainValidationOptions' + ' missing' + ' for ' + n) hash = lambda v: hashlib.new('md5', json_dumps(v, sort_keys=True).encode()).hexdigest() def add_tags(): """ Add tags from the ResourceProperties to the Certificate Also adds logical-id, stack-id, stack-name and properties tags, which are used by the custom resource. """ tags = shallow_copy(event['ResourceProperties'].get('Tags', [])) tags += [ {'Key': 'cloudformation:' + 'logical-id', 'Value': event['LogicalResourceId']}, {'Key': 'cloudformation:' + 'stack-id', 'Value': event['StackId']}, {'Key': 'cloudformation:' + 'stack-name', 'Value': event['StackId'].split('/')[1]}, {'Key': 'cloudformation:' + 'properties', 'Value': hash(event['ResourceProperties'])} ] acm.add_tags_to_certificate(**{'CertificateArn': event['PhysicalResourceId'], 'Tags': tags}) def send_response(): """ Send a response to cloudformation """ log_info(event) response = requests.put(event['ResponseURL'], json=event, headers={'content-type': ''}) response.raise_for_status() try: i_token = hash(event['RequestId'] + event['StackId']) props = event['ResourceProperties'] acm = client('acm', region_name=props.get('Region')) event['Status'] = 'SUCCESS' if event['RequestType'] == 'Create': if event.get('Reinvoked', False) is False: event['PhysicalResourceId'] = 'None' request_cert() validate() if not wait_for_issuance(): return reinvoke() elif event['RequestType'] == 'Delete': if event['PhysicalResourceId'] != 'None': if event['PhysicalResourceId'].startswith('arn:'): delete_certificate(event['PhysicalResourceId']) else: delete_certificate(find_certificate(props)) elif event['RequestType'] == 'Update': if replace_cert(): log_info('Update') if find_certificate(props) == event['PhysicalResourceId']: # This is an update cancel request. # Try and delete the new certificate that is no longer required try: acm = client('acm', region_name=event['OldResourceProperties'].get('Region')) log_info('Delete') delete_certificate(find_certificate(event['OldResourceProperties'])) except: log_exception('') # return success for the update - nothing changed return send_response() if event.get('Reinvoked', False) is False: request_cert() validate() if not wait_for_issuance(): return reinvoke() else: if 'Tags' in event['Old' + 'ResourceProperties']: acm.remove_tags_from_certificate(**{ 'CertificateArn': event['PhysicalResourceId'], 'Tags': event['Old' + 'ResourceProperties']['Tags'] }) add_tags() else: raise RuntimeError(event['RequestType']) return send_response() except Exception as ex: log_exception('') event['Status'] = 'FAILED' event['Reason'] = str(ex) return send_response()
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Target python:
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4065 Bytes
R=RuntimeError import copy,hashlib,json,logging as B,time from boto3 import client as L from botocore.exceptions import ClientError as A2,ParamValidationError as A3 from botocore.vendored import requests as A4 A=B.getLogger() A.setLevel(B.INFO) D=A.info Y=A.exception j=json.dumps Q=copy.copy Z=time.sleep def handler(A,k): A1='OldResourceProperties';A0='Update';z='Delete';y='None';x='acm';w='FAILED';v='properties';u='stack-id';t='logical-id';s='DNS';i='Old';h='Certificate';g='LogicalResourceId';f='DomainName';e='Route53RoleArn';d='Region';X='RequestType';W='Reinvoked';V='StackId';U='DomainValidationOptions';T='ValidationMethod';S=None;P='Status';O='Key';N='';M=True;K='ResourceProperties';J='cloudformation:';I='Value';H=False;G='CertificateArn';F='Tags';C='PhysicalResourceId';l=k.get_remaining_time_in_millis;D(A) def m(): D=Q(B) for H in['ServiceToken',d,F,e]:D.pop(H,S) if T in B: if B[T]==s: for I in set([B[f]]+B.get('SubjectAlternativeNames',[])):q(I) del D[U] A[C]=E.request_certificate(IdempotencyToken=A6,**D)[G];r() def a(a): while M: try:E.delete_certificate(**{G:a});return except A2 as B: Y(N);A=B.response['Error']['Code'] if A=='ResourceInUseException': if l()/1000<30:raise Z(5);continue if A in['ResourceNotFoundException','ValidationException']:return raise except A3:return def b(props): for H in E.get_paginator('list_certificates').paginate(): for B in H['CertificateSummaryList']: D(B);C={A[O]:A[I]for A in E.list_tags_for_certificate(**{G:B[G]})[F]} if C.get(J+t)==A[g]and C.get(J+u)==A[V]and C.get(J+v)==hash(props):return B[G] def n(): if A.get(W,H):raise R('Certificate not issued in time') A[W]=M;D(A);L('lambda').invoke(FunctionName=k.invoked_function_arn,InvocationType='Event',Payload=j(A).encode()) def o(): while l()/1000>30: B=E.describe_certificate(**{G:A[C]})[h];D(B) if B[P]=='ISSUED':return M elif B[P]==w:raise R(B.get('FailureReason',N)) Z(5) return H def A5():B=Q(A[i+K]);B.pop(F,S);C=Q(A[K]);C.pop(F,S);return B!=C def p(): a='Type';Y='Name';X='HostedZoneId';W='ValidationStatus';V='PENDING_VALIDATION';J='ResourceRecord' if T in B and B[T]==s: K=H while not K: K=M;N=E.describe_certificate(**{G:A[C]})[h];D(N) if N[P]!=V:return for F in N[U]: if W not in F or J not in F:K=H;continue if F[W]==V:Q=q(F[f]);R=Q.get(e,B.get(e));O=L('sts').assume_role(RoleArn=R,RoleSessionName=(h+A[g])[:64],DurationSeconds=900)['Credentials']if R is not S else{};b=L('route53',aws_access_key_id=O.get('AccessKeyId'),aws_secret_access_key=O.get('SecretAccessKey'),aws_session_token=O.get('SessionToken')).change_resource_record_sets(**{X:Q[X],'ChangeBatch':{'Comment':'Domain validation for '+A[C],'Changes':[{'Action':'UPSERT','ResourceRecordSet':{Y:F[J][Y],a:F[J][a],'TTL':60,'ResourceRecords':[{I:F[J][I]}]}}]}});D(b) Z(1) def q(n): C='.';n=n.rstrip(C);D={A[f].rstrip(C):A for A in B[U]};A=n.split(C) while len(A): if C.join(A)in D:return D[C.join(A)] A=A[1:] raise R(U+' missing'+' for '+n) hash=lambda v:hashlib.new('md5',j(v,sort_keys=M).encode()).hexdigest() def r():B=Q(A[K].get(F,[]));B+=[{O:J+t,I:A[g]},{O:J+u,I:A[V]},{O:J+'stack-name',I:A[V].split('/')[1]},{O:J+v,I:hash(A[K])}];E.add_tags_to_certificate(**{G:A[C],F:B}) def c():D(A);B=A4.put(A['ResponseURL'],json=A,headers={'content-type':N});B.raise_for_status() try: A6=hash(A['RequestId']+A[V]);B=A[K];E=L(x,region_name=B.get(d));A[P]='SUCCESS' if A[X]=='Create': if A.get(W,H)is H:A[C]=y;m() p() if not o():return n() elif A[X]==z: if A[C]!=y: if A[C].startswith('arn:'):a(A[C]) else:a(b(B)) elif A[X]==A0: if A5(): D(A0) if b(B)==A[C]: try:E=L(x,region_name=A[A1].get(d));D(z);a(b(A[A1])) except:Y(N) return c() if A.get(W,H)is H:m() p() if not o():return n() else: if F in A[i+K]:E.remove_tags_from_certificate(**{G:A[C],F:A[i+K][F]}) r() else:raise R(A[X]) return c() except Exception as A7:Y(N);A[P]=w;A['Reason']=str(A7);return c()
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