AWS Waf 및 Shield를 사용하여 DDoS 보호

- AWS Shield 및 웹 애플리케이션 방화벽(WAF)은 모두 AWS 네트워크에 경계 방어를 제공하는 제품입니다.

- Shield는 DDOS 보호 기능을 제공하고 WAF는 Layer 7 애플리케이션 방화벽입니다.

- 참조: https://www.cloudflare.com/en-au/learning/ddos/what-is-a-ddos-attack/

- CDK를 사용하여 예상 규칙으로 AWS WAF를 생성하고 이를 ALB에 연결할 수 있습니다.

이 문서의 내용

🚀 WAF CDK 프로젝트 초기화

⚡ $ mkdir waf_alb
⚡ $ cd waf_alb
⚡ $ cdk init -l python

🚀 코드 스택 작성

aws wafv2 list-available-managed-rule-groups --scope REGIONAL

from aws_cdk import (
    aws_cloudformation as cfn,
    aws_wafv2 as waf,
    core,
)


class WafStack(core.Stack):

    def __init__(self, scope: core.Construct, id: str, env, target_arn, **kwargs) -> None:
        super().__init__(scope, id, env=env, **kwargs)

        waf_rules = list()

        """ 1. Reputation List """
        aws_ip_rep_list = waf.CfnWebACL.RuleProperty(
            name='WafIpreputation',
            priority=1,
            override_action=waf.CfnWebACL.OverrideActionProperty(count={}),
            statement=waf.CfnWebACL.StatementOneProperty(
                managed_rule_group_statement=waf.CfnWebACL.ManagedRuleGroupStatementProperty(
                    name='AWSManagedRulesAmazonIpReputationList',
                    vendor_name='AWS',
                    excluded_rules=[]
                )
            ),
            visibility_config=waf.CfnWebACL.VisibilityConfigProperty(
                cloud_watch_metrics_enabled=True,
                metric_name='aws_reputation',
                sampled_requests_enabled=True,
            )
        )
        waf_rules.append(aws_ip_rep_list)

        """ 2. AnonymousIpList """
        aws_anony_list = waf.CfnWebACL.RuleProperty(
            name='WafAnony',
            priority=2,
            override_action=waf.CfnWebACL.OverrideActionProperty(count={}),
            statement=waf.CfnWebACL.StatementOneProperty(
                managed_rule_group_statement=waf.CfnWebACL.ManagedRuleGroupStatementProperty(
                    name='AWSManagedRulesAnonymousIpList',
                    vendor_name='AWS',
                    excluded_rules=[]
                )
            ),
            visibility_config=waf.CfnWebACL.VisibilityConfigProperty(
                cloud_watch_metrics_enabled=True,
                metric_name='aws_anony',
                sampled_requests_enabled=True,
            )
        )
        waf_rules.append(aws_anony_list)

        """ 3. CommonRule """
        aws_common_rule = waf.CfnWebACL.RuleProperty(
            name='WafCommonRule',
            priority=3,
            override_action=waf.CfnWebACL.OverrideActionProperty(count={}),
            statement=waf.CfnWebACL.StatementOneProperty(
                managed_rule_group_statement=waf.CfnWebACL.ManagedRuleGroupStatementProperty(
                    name='AWSManagedRulesCommonRuleSet',
                    vendor_name='AWS',
                    excluded_rules=[]
                )
            ),
            visibility_config=waf.CfnWebACL.VisibilityConfigProperty(
                cloud_watch_metrics_enabled=True,
                metric_name='aws_common',
                sampled_requests_enabled=True,
            )
        )
        waf_rules.append(aws_common_rule)

        """ 4. PHP Rule """
        aws_php_rule = waf.CfnWebACL.RuleProperty(
            name='WafPHPRule',
            priority=4,
            override_action=waf.CfnWebACL.OverrideActionProperty(count={}),
            statement=waf.CfnWebACL.StatementOneProperty(
                managed_rule_group_statement=waf.CfnWebACL.ManagedRuleGroupStatementProperty(
                    name='AWSManagedRulesPHPRuleSet',
                    vendor_name='AWS',
                    excluded_rules=[]
                )
            ),
            visibility_config=waf.CfnWebACL.VisibilityConfigProperty(
                cloud_watch_metrics_enabled=True,
                metric_name='aws_php',
                sampled_requests_enabled=True,
            )
        )
        waf_rules.append(aws_php_rule)

        """ 5. Linux Rule """
        aws_linux_rule = waf.CfnWebACL.RuleProperty(
            name='WafLinuxRule',
            priority=5,
            override_action=waf.CfnWebACL.OverrideActionProperty(count={}),
            statement=waf.CfnWebACL.StatementOneProperty(
                managed_rule_group_statement=waf.CfnWebACL.ManagedRuleGroupStatementProperty(
                    name='AWSManagedRulesLinuxRuleSet',
                    vendor_name='AWS',
                    excluded_rules=[]
                )
            ),
            visibility_config=waf.CfnWebACL.VisibilityConfigProperty(
                cloud_watch_metrics_enabled=True,
                metric_name='aws_linux',
                sampled_requests_enabled=True,
            )
        )
        waf_rules.append(aws_linux_rule)

        """ DefaultAction: Action of AWS WAF to perform when a web request doesn't match any of the rules in the WebACL. """
        web_acl = waf.CfnWebACL(
            self, 'WebACL',
            default_action=waf.CfnWebACL.DefaultActionProperty(
                allow={}
            ),
            scope="REGIONAL",  # vs 'CLOUDFRONT'
            visibility_config=waf.CfnWebACL.VisibilityConfigProperty(
                cloud_watch_metrics_enabled=True,
                metric_name='webACL',
                sampled_requests_enabled=True
            ),
            name=f'prod-acl',
            rules=waf_rules
        )

        """ Associate it with the resource provided. """
        waf.CfnWebACLAssociation(self, 'WAFACLAssociateALB',
                                 web_acl_arn=web_acl.attr_arn,
                                 resource_arn=target_arn
                                 )

🚀 스택 배포

⚡ $ cdk ls
theWalACLAlblon

⚡ $ cdk deploy 
theWalACLAlblon: deploying...
theWalACLAlblon: creating CloudFormation changeset...
[██████████████████████████████████████████████████████████] (4/4)


 ✅  theWalACLAlblon

Stack ARN:
arn:aws:cloudformation:eu-west-2:111111111111:stack/theWalACLAlblon/fbe06250-740f-11eb-9c9f-0685bc814060

요청:

규칙:

준회원 ALB

Cloudwatch 지표

· Github · 편물 · · · 페이지 ·