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Add EICAR archive to live_test (#90)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H* |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,161 @@ | ||
| """Upload test files to S3 and see if the expected matches appear in Dynamo.""" | ||
| import hashlib | ||
| import os | ||
| import pprint | ||
| import time | ||
| from typing import Dict, List | ||
| import uuid | ||
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| import boto3 | ||
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| TEST_DIR = os.path.dirname(os.path.realpath(__file__)) | ||
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| def _upload_test_files_to_s3(bucket_name: str) -> Dict[str, str]: | ||
| """Upload test files to S3 and returns a map from SHA256 to S3 identifier.""" | ||
| bucket = boto3.resource('s3').Bucket(bucket_name) | ||
| random_suffix = str(uuid.uuid4()).split('-')[-1] | ||
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| result = {} | ||
| for filename in ['eicar.txt', 'eicar.tar.gz.bz2']: | ||
| filepath = os.path.join(TEST_DIR, 'files', filename) | ||
| s3_object_key = '{}_{}'.format(filename, random_suffix) | ||
| s3_full_identifier = 'S3:{}:{}'.format(bucket_name, s3_object_key) | ||
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| with open(filepath, 'rb') as f: | ||
| sha256 = hashlib.sha256(f.read()).hexdigest() | ||
| result[sha256] = s3_full_identifier | ||
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| print('Uploading {} to {}...'.format(filename, s3_full_identifier)) | ||
| bucket.upload_file(filepath, s3_object_key, ExtraArgs={'Metadata': {'filepath': filename}}) | ||
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| return result | ||
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| def _lambda_production_version(function_name: str) -> int: | ||
| """Find the version associated with the Production alias of a Lambda function.""" | ||
| print('Looking up version of {}:Production...'.format(function_name)) | ||
| response = boto3.client('lambda').list_aliases(FunctionName=function_name) | ||
| for alias in response['Aliases']: | ||
| if alias['Name'] == 'Production': | ||
| return int(alias['FunctionVersion']) | ||
| return -1 | ||
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| def _query_dynamo_for_test_files( | ||
| table_name: str, file_info: Dict[str, str], analyzer_version: int, | ||
| max_attempts: int = 15) -> List: | ||
| """Repeatedly query DynamoDB to look for the expected YARA matches. | ||
| Args: | ||
| table_name: Name of the DynamoDB match table. | ||
| file_info: Dictionary from _upload_test_files_to_s3. | ||
| analyzer_version: The underlying Lambda version for the Production alias of the analyzer. | ||
| max_attempts: Max number of times to query for results (with 5 seconds between each). | ||
| Returns: | ||
| True if the expected entries were found | ||
| """ | ||
| client = boto3.client('dynamodb') | ||
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| for attempt in range(1, max_attempts + 1): | ||
| if attempt > 1: | ||
| time.sleep(5) | ||
| print('\t[{}/{}] Querying DynamoDB table for the expected YARA match entries...'.format( | ||
| attempt, max_attempts)) | ||
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| results = client.batch_get_item( | ||
| RequestItems={ | ||
| table_name: { | ||
| 'Keys': [ | ||
| { | ||
| 'SHA256': {'S': sha}, | ||
| 'AnalyzerVersion': {'N': str(analyzer_version)} | ||
| } | ||
| for sha in file_info | ||
| ] | ||
| } | ||
| } | ||
| )['Responses'][table_name] | ||
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| if len(results) < len(file_info): | ||
| # If there weren't as many matches as files uploaded, stop and try again. | ||
| continue | ||
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| # Make sure the matches found are from the files we uploaded (and not others). | ||
| all_objects_found = True | ||
| for entry in results: | ||
| file_id = file_info[entry['SHA256']['S']] | ||
| if file_id not in entry['S3Objects']['SS']: | ||
| all_objects_found = False | ||
| break | ||
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| if not all_objects_found: | ||
| continue | ||
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| # The results check out! | ||
| return results | ||
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| return [] | ||
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| def _cleanup( | ||
| bucket_name: str, file_info: Dict[str, str], table_name: str, | ||
| analyzer_version: int) -> None: | ||
| """Remove test files and match information.""" | ||
| print('Removing test files from S3...') | ||
| bucket = boto3.resource('s3').Bucket(bucket_name) | ||
| bucket.delete_objects( | ||
| Delete={ | ||
| 'Objects': [ | ||
| {'Key': s3_identifier.split(':')[-1]} | ||
| for s3_identifier in file_info.values() | ||
| ] | ||
| } | ||
| ) | ||
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| print('Removing DynamoDB match entries...') | ||
| client = boto3.resource('dynamodb') | ||
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| client.batch_write_item( | ||
| RequestItems={ | ||
| table_name: [ | ||
| { | ||
| 'DeleteRequest': { | ||
| 'Key': { | ||
| 'SHA256': sha, | ||
| 'AnalyzerVersion': analyzer_version | ||
| } | ||
| } | ||
| } | ||
| for sha in file_info | ||
| ] | ||
| } | ||
| ) | ||
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| def run(bucket_name: str, analyzer_function_name: str, table_name: str) -> bool: | ||
| """Upload an EICAR test file to BinaryAlert which should trigger a YARA match alert. | ||
| Args: | ||
| bucket_name: Name of the S3 bucket containing binaries. | ||
| analyzer_function_name: Name of the YARA analyzer Lambda function. | ||
| table_name: Name of the Dynamo table storing YARA match information. | ||
| Returns: | ||
| True if the test was successful, False otherwise. | ||
| """ | ||
| test_file_info = _upload_test_files_to_s3(bucket_name) | ||
| analyzer_version = _lambda_production_version(analyzer_function_name) | ||
| results = _query_dynamo_for_test_files(table_name, test_file_info, analyzer_version) | ||
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| if results: | ||
| print() | ||
| pprint.pprint(results) | ||
| print('\nSUCCESS: Expected DynamoDB entries for the test files were found!') | ||
| else: | ||
| print('\nFAIL: Expected DynamoDB entries for the test files were *not* found :(\n') | ||
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| _cleanup(bucket_name, test_file_info, table_name, analyzer_version) | ||
| print('Done!') | ||
| return bool(results) |
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