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s3-checksum.yaml
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s3-checksum.yaml
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AWSTemplateFormatVersion: "2010-09-09"
Description: Template to setup auto-generation of checksums for objects uploaded onto Amazon S3
Parameters:
ChecksumAlgorithm:
Type: String
Default: SHA256
AllowedValues:
- CRC32
- CRC32C
- SHA1
- SHA256
Description: Select Checksum Algorithm. Default and recommended choice is SHA256, however CRC32, CRC32C, SHA1 are also available.
S3Bucket:
Type: String
Description: Enter the Amazon S3 bucket for setting up Checksums.
Resources:
ChecksumLambdaFunction:
Type: AWS::Lambda::Function
Properties:
Code:
ZipFile: |
from urllib.parse import unquote_plus
import boto3
import os
s3_client = boto3.client('s3')
s3_resource = s3 = boto3.resource('s3')
def handler(event, context):
print(event)
bucket = event['Records'][0]['s3']['bucket']['name']
key = event['Records'][0]['s3']['object']['key']
key = unquote_plus(key)
print(f"Object '{key}' was just uploaded in Bucket {bucket}.")
copy_source = {
'Bucket': bucket,
'Key': key
}
attributes = get_attributes(bucket, key)
print(f"Attributes!!!")
print(attributes['Checksum'])
# Only proceed if Checksums don't already exist
if attributes['Checksum'] == None:
print(f"Copying {key} to the same place but adding Checksum ...")
try:
# If using SSE-KMS
if 'EncryptionKey' in attributes:
s3_resource.meta.client.copy(
copy_source,
Bucket=bucket,
Key=key,
ExtraArgs={
'ChecksumAlgorithm':os.environ['Checksum'],
'StorageClass': attributes['StorageClass'],
'ServerSideEncryption': attributes['Encryption'],
'SSEKMSKeyId': attributes['EncryptionKey']
}
)
# If using SSE-S3
elif attributes['Encryption'] != None:
s3_resource.meta.client.copy(
copy_source,
Bucket=bucket,
Key=key,
ExtraArgs={
'ChecksumAlgorithm':os.environ['Checksum'],
'StorageClass': attributes['StorageClass'],
'ServerSideEncryption': attributes['Encryption']
}
)
# If not using any encryption - NOT RECOMMENDED
else:
print(os.environ['Checksum'])
s3_resource.meta.client.copy(
copy_source,
Bucket=bucket,
Key=key,
ExtraArgs={
'ChecksumAlgorithm':os.environ['Checksum'],
'StorageClass': attributes['StorageClass']
}
)
print(f"SUCCESS: {key} now has a {os.environ['Checksum']} Checksum ")
except Exception as e:
print(e)
raise
else:
print(f"{key} already has a Checksum; No further action needed!")
return
def get_attributes(bucket, key):
try:
attributes = {}
response = s3_client.get_object_attributes(
Bucket=bucket,
Key=key,
ObjectAttributes=['Checksum']
)
# Check if the Object already has Checksums
checksum = response['Checksum'].keys() if 'Checksum' in response else [ ]
print(f"Checking whether {key} already has Checksum {checksum}")
if 'ChecksumCRC32' in checksum:
attributes['Checksum'] = 'ChecksumCRC32'
print(f"{key} already has a CRC32 Checksum!")
return attributes
elif 'ChecksumCRC32C' in checksum:
attributes['Checksum'] = 'ChecksumCRC32C'
print(f"{key} already has a CRC32C Checksum!")
return attributes
elif 'ChecksumSHA1' in checksum:
attributes['Checksum'] = 'ChecksumSHA1'
print(f"{key} already has a SHA1 Checksum!")
return attributes
elif 'ChecksumSHA256' in checksum:
attributes['Checksum'] = 'ChecksumSHA256'
print(f"{key} already has a SHA256 Checksum!")
return attributes
else:
print(f"{key} does not have a Checksum!")
attributes['Checksum'] = None
print(f"Obtaining other attributes for {key} ...")
#Check Object's storage class
print(f"Checking Storage Class for {key} ...")
if 'StorageClass' not in response:
print(f"{key} is stored in S3-STANDARD.")
attributes['StorageClass'] = 'STANDARD'
else:
storage_class = response['StorageClass']
print(f"{key} is stored in {storage_class}.")
attributes['StorageClass'] = response['StorageClass']
# Check Object's encryption
print(f"Checking Encryption for {key} ...")
if 'ServerSideEncryption' not in response:
print(f"{key} is not encrypted.")
attributes['Encryption'] = None
else:
print(f"{key} is encrypted.")
attributes['Encryption'] = response['ServerSideEncryption']
if response['ServerSideEncryption'] == 'aws:kms':
attributes['EncryptionKey'] = response['SSEKMSKeyId']
return attributes
except Exception as e:
print(e)
raise
Description: Function to add Checksums to objects in Amazon S3
Environment:
Variables:
Checksum: !Ref ChecksumAlgorithm
Handler: index.handler
Role: !GetAtt ChecksumLambdaRole.Arn
Runtime: python3.9
Timeout: 600
ReservedConcurrentExecutions: 10
Metadata:
cfn_nag:
rules_to_suppress:
- id: W89
reason: "The function does not process any data but merely copies it, hence VPC configuration is not needed."
ChecksumLambdaRole:
Type: 'AWS::IAM::Role'
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service: 'lambda.amazonaws.com'
Action:
- 'sts:AssumeRole'
Path: '/'
ManagedPolicyArns:
- 'arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole'
Policies:
- PolicyName: S3Permissions
PolicyDocument:
Version: 2012-10-17
Statement:
- Sid: S3ReadWrite
Effect: Allow
Action:
- s3:PutObject
- s3:PutObjectTagging
- s3:PutObjectAcl
- s3:GetObject
- s3:GetObjectVersion
- s3:GetObjectTagging
- s3:GetObjectAcl
- s3:GetObjectAttributes
- s3:GetObjectVersionAttributes
- s3:ListBucket
Resource:
- !Sub 'arn:aws:s3:::${S3Bucket}/*'
- PolicyName: KMSPermissions
PolicyDocument:
Version: 2012-10-17
Statement:
- Sid: S3ReadWrite
Effect: Allow
Action:
- kms:Decrypt
- kms:Encrypt
- kms:GenerateDataKey
Resource:
- !Sub 'arn:aws:kms:${AWS::Region}:${AWS::AccountId}:key/*'
S3InvokeLambdaPermission:
Type: AWS::Lambda::Permission
Properties:
Action: lambda:InvokeFunction
FunctionName: !Ref ChecksumLambdaFunction
Principal: s3.amazonaws.com
SourceArn: !Sub arn:aws:s3:::${S3Bucket}
SourceAccount: !Ref 'AWS::AccountId'
S3BatchRole:
Type: 'AWS::IAM::Role'
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service: 'batchoperations.s3.amazonaws.com'
Action:
- 'sts:AssumeRole'
Path: '/'
Policies:
- PolicyName: S3Permissions
PolicyDocument:
Version: 2012-10-17
Statement:
- Sid: S3ReadWrite
Effect: Allow
Action:
- s3:PutObject
- s3:PutObjectAcl
- s3:PutObjectTagging
- s3:GetObject
- s3:GetObjectVersion
- s3:GetObjectAcl
- s3:GetObjectTagging
- s3:ListBucket
- s3:InitiateReplication
- s3:GetReplicationConfiguration
- s3:PutInventoryConfiguration
Resource:
- !Sub 'arn:aws:s3:::${S3Bucket}/*'
- PolicyName: KMSPermissions
PolicyDocument:
Version: 2012-10-17
Statement:
- Sid: S3ReadWrite
Effect: Allow
Action:
- kms:Decrypt
- kms:Encrypt
- kms:GenerateDataKey
Resource:
- !Sub 'arn:aws:kms:${AWS::Region}:${AWS::AccountId}:key/*'