mirror of https://gitlab.com/curben/blog
139 lines
4.7 KiB
Python
139 lines
4.7 KiB
Python
#!/usr/bin/env python
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# MIT license (c) 2021 Ming Di Leom
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# Download AWS WAF's Web ACLs and convert them into human-readable format.
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# Usage: ./waf-acl.py --profile {profile-name} --directory output-dir --original
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# Requirements: pip -q install boto3
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from argparse import ArgumentParser
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import boto3
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from botocore.config import Config
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from datetime import date
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from json import dump
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from os import path
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from pathlib import Path
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parser = ArgumentParser(description = 'For the provided profile, download all web ACLs in human-readable format.')
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parser.add_argument('--profile', '-p',
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help = 'AWS profile name. Parsed from ~/.aws/credentials.',
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required = True)
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parser.add_argument('--directory', '-d',
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help = 'Output folder. Exported links will be saved in the current folder if not specified.',
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default = '')
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parser.add_argument('--original', '-a',
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help = 'Also download raw ACLs.',
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action = 'store_true')
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args = parser.parse_args()
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profile = args.profile
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original = args.original
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dirPath = args.directory
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Path(dirPath).mkdir(parents = True, exist_ok = True)
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today = date.today().strftime('%Y%m%d')
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session = boto3.session.Session(profile_name = profile)
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# Cloudfront ACLs uses us-east-1 region
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my_config = Config(region_name = 'us-east-1')
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client = session.client('wafv2', config = my_config)
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# Modify the scope for regional WAF
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web_acls = client.list_web_acls(Scope = 'CLOUDFRONT')['WebACLs']
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def byteToString(bts):
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if isinstance(bts, bytes):
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return str(bts, encoding = 'utf-8')
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return bts
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# Parse first key of a dictionary
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def first_key(obj):
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return list(obj.keys())[0]
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def parse_statement(obj):
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first_key_obj = first_key(obj)
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text = first_key_obj
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if first_key_obj == 'NotStatement' or first_key_obj == 'ByteMatchStatement':
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not_prefix = ''
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search_string = ''
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field_match = ''
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positional_constraint = ''
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if first_key_obj == 'NotStatement':
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not_prefix = 'NOT '
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obj = obj['NotStatement']['Statement']
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first_key_obj = first_key(obj)
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if first_key_obj == 'ByteMatchStatement':
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search_string = byteToString(obj['ByteMatchStatement']['SearchString'])
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field_match = first_key(obj['ByteMatchStatement']['FieldToMatch']) \
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if first_key(obj['ByteMatchStatement']['FieldToMatch']) != 'SingleHeader' \
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else obj['ByteMatchStatement']['FieldToMatch']['SingleHeader']['Name']
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positional_constraint = obj['ByteMatchStatement']['PositionalConstraint']
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elif first_key_obj == 'IPSetReferenceStatement':
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search_string = obj['IPSetReferenceStatement']['ARN']
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positional_constraint = 'IPSet'
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separator = '=' if len(field_match) >= 1 else ''
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text = f'{not_prefix}{field_match}{separator}{positional_constraint}({search_string})'
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elif first_key_obj == 'SqliMatchStatement' or first_key_obj == 'XssMatchStatement':
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text = f'{first_key_obj}({first_key(obj[first_key_obj]["FieldToMatch"])})'
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return text
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# Make rule statements human-readable
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def parse_rule(obj):
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text = ''
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first_key_obj = first_key(obj)
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if first_key_obj == 'AndStatement' or first_key_obj == 'OrStatement':
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and_or = 'AND' if first_key_obj == 'AndStatement' else 'OR'
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open_paren = '(' if first_key_obj == 'OrStatement' else ''
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close_paren = ')' if first_key_obj == 'OrStatement' else ''
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statements = obj[first_key_obj]['Statements']
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for i in range(0, len(statements)):
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statement = statements[i]
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rule = parse_statement(statement)
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if first_key(statement) == 'AndStatement' or first_key(statement) == 'OrStatement':
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rule = parse_rule(statement)
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if i == 0:
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text = f'{open_paren}{rule}'
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elif i == len(statements) - 1:
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text = f' {text} {and_or} {rule}{close_paren}'
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else:
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text = f' {text} {and_or} {rule}'
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elif first_key_obj == 'IPSetReferenceStatement':
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text = f'IPSet({obj["IPSetReferenceStatement"]["ARN"]})'
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else:
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text = first_key_obj
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return text.strip()
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for web_acl in web_acls:
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web_acl_rule = client.get_web_acl(
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Name = web_acl['Name'],
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Scope = 'CLOUDFRONT',
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Id = web_acl['Id']
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)
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if original:
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with open(path.join(dirPath, f'{web_acl["Name"]}-original-{today}.json'), mode = 'w') as f:
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# response may contain byte data that json.dump() doesn't like, hence byteToString()
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dump(web_acl_rule['WebACL'], f, indent = 2, default = byteToString)
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rules = []
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for rule in web_acl_rule['WebACL']['Rules']:
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out_rule = {
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# Name: "Rule"
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# Action: "Allow|Block"
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}
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out_rule[rule['Name']] = parse_rule(rule['Statement']).strip()
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out_rule['Action'] = 'Allow' if first_key(rule['Action']) == 'Allow' else 'Block'
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rules.append(out_rule)
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with open(path.join(dirPath, f'{web_acl["Name"]}-{today}.json'), mode = 'w') as f:
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dump(rules, f, indent = 2)
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