php-awsHow can I use AWS WAF to secure my PHP application?

AWS WAF can be used to secure a PHP application by setting up rules and conditions to filter and block malicious requests.

For example, the following code block can be used to create a rule that blocks requests with a malicious User-Agent header:

aws waf create-rule \
--name BlockMaliciousUserAgent \
--metric-name BlockMaliciousUserAgent \
--change-token $CHANGE_TOKEN \
--predicates '[
    {
        "Negated": false,
        "Type": "ByteMatch",
        "DataId": "MaliciousUserAgentList",
        "FieldToMatch": {
            "Type": "HEADER",
            "Data": "user-agent"
        }
    }
]'

The following code block can be used to create a condition that contains a list of malicious User-Agent headers:

aws waf create-byte-match-set \
--name MaliciousUserAgentList \
--change-token $CHANGE_TOKEN \
--byte-match-tuples '[
    {
        "FieldToMatch": {
            "Type": "HEADER",
            "Data": "user-agent"
        },
        "TargetString": "MaliciousUserAgent1",
        "TextTransformation": "NONE"
    },
    {
        "FieldToMatch": {
            "Type": "HEADER",
            "Data": "user-agent"
        },
        "TargetString": "MaliciousUserAgent2",
        "TextTransformation": "NONE"
    }
]'

Once the rule and condition have been created, they can be added to a web ACL which can then be associated with the PHP application.

1. Create a rule that blocks requests with a malicious User-Agent header
   • aws waf create-rule
2. Create a condition that contains a list of malicious User-Agent headers
   • aws waf create-byte-match-set
3. Add the rule and condition to a web ACL
   • aws waf create-web-acl
4. Associate the web ACL with the PHP application
   • aws waf associate-web-acl

Helpful links

• AWS WAF Documentation
• Create a Rule
• Create a Byte Match Set
• Create a Web ACL
• Associate a Web ACL

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