wafBypass.js

class WAFBypassTechniques {
    constructor() {
        this.encodingMethods = {
            base64: this.base64Encode.bind(this),
            url: this.urlEncode.bind(this),
            html: this.htmlEncode.bind(this),
            js: this.jsEncode.bind(this),
            unicode: this.unicodeEncode.bind(this),
            hex: this.hexEncode.bind(this)
        };

        this.obfuscationMethods = {
            string: this.obfuscateString.bind(this),
            eval: this.obfuscateEval.bind(this),
            concat: this.obfuscateConcat.bind(this),
            template: this.obfuscateTemplate.bind(this)
        };

        this.wafSignatures = {
            modSecurity: {
                patterns: [/mod_security/, /NOYB/],
                bypassTechniques: ['encoding', 'obfuscation', 'splitting']
            },
            cloudflare: {
                patterns: [/cloudflare-nginx/, /cf-ray/],
                bypassTechniques: ['encoding', 'obfuscation', 'splitting', 'chunked']
            },
            aws: {
                patterns: [/x-amzn-RequestId/, /x-amz-cf-id/],
                bypassTechniques: ['encoding', 'obfuscation', 'splitting', 'chunked']
            },
            akamai: {
                patterns: [/AkamaiGHost/, /Akamai-Origin-Hop/],
                bypassTechniques: ['encoding', 'obfuscation', 'splitting', 'chunked']
            }
        };
    }

    // 检测WAF类型
    detectWAFType() {
        const headers = this.getResponseHeaders();
        for (const [name, waf] of Object.entries(this.wafSignatures)) {
            for (const pattern of waf.patterns) {
                if (this.checkHeaderPattern(headers, pattern)) {
                    return {
                        detected: true,
                        type: name,
                        bypassTechniques: waf.bypassTechniques
                    };
                }
            }
        }
        return { detected: false };
    }

    // 检查响应头模式
    checkHeaderPattern(headers, pattern) {
        for (const [name, value] of headers.entries()) {
            if (pattern.test(value)) {
                return true;
            }
        }
        return false;
    }

    // 生成绕过变体
    generateBypassVariants(payload, wafType) {
        const variants = [];
        const waf = this.wafSignatures[wafType];

        if (!waf) {
            return variants;
        }

        // 生成编码变体
        if (waf.bypassTechniques.includes('encoding')) {
            for (const [name, method] of Object.entries(this.encodingMethods)) {
                variants.push({
                    type: 'encoding',
                    method: name,
                    payload: method(payload)
                });
            }
        }

        // 生成混淆变体
        if (waf.bypassTechniques.includes('obfuscation')) {
            for (const [name, method] of Object.entries(this.obfuscationMethods)) {
                variants.push({
                    type: 'obfuscation',
                    method: name,
                    payload: method(payload)
                });
            }
        }

        // 生成分割变体
        if (waf.bypassTechniques.includes('splitting')) {
            variants.push(...this.generateSplitVariants(payload));
        }

        // 生成分块变体
        if (waf.bypassTechniques.includes('chunked')) {
            variants.push(...this.generateChunkedVariants(payload));
        }

        return variants;
    }

    // 生成分割变体
    generateSplitVariants(payload) {
        const variants = [];

        // 字符串分割
        variants.push({
            type: 'splitting',
            method: 'string',
            payload: this.splitString(payload)
        });

        // 数组分割
        variants.push({
            type: 'splitting',
            method: 'array',
            payload: this.splitArray(payload)
        });

        // 对象分割
        variants.push({
            type: 'splitting',
            method: 'object',
            payload: this.splitObject(payload)
        });

        return variants;
    }

    // 生成分块变体
    generateChunkedVariants(payload) {
        const variants = [];

        // 固定大小分块
        variants.push({
            type: 'chunked',
            method: 'fixed',
            payload: this.chunkFixed(payload)
        });

        // 动态大小分块
        variants.push({
            type: 'chunked',
            method: 'dynamic',
            payload: this.chunkDynamic(payload)
        });

        return variants;
    }

    // 字符串分割
    splitString(payload) {
        const chunks = [];
        const chunkSize = 2;

        for (let i = 0; i < payload.length; i += chunkSize) {
            chunks.push(payload.slice(i, i + chunkSize));
        }

        return chunks.join('+');
    }

    // 数组分割
    splitArray(payload) {
        const chunks = [];
        const chunkSize = 2;

        for (let i = 0; i < payload.length; i += chunkSize) {
            chunks.push(`"${payload.slice(i, i + chunkSize)}"`);
        }

        return `[${chunks.join(',')}].join('')`;
    }

    // 对象分割
    splitObject(payload) {
        const chunks = [];
        const chunkSize = 2;

        for (let i = 0; i < payload.length; i += chunkSize) {
            chunks.push(`"${i}":"${payload.slice(i, i + chunkSize)}"`);
        }

        return `Object.values({${chunks.join(',')}}).join('')`;
    }

    // 固定大小分块
    chunkFixed(payload) {
        const chunks = [];
        const chunkSize = 4;

        for (let i = 0; i < payload.length; i += chunkSize) {
            chunks.push(payload.slice(i, i + chunkSize));
        }

        return chunks.join('');
    }

    // 动态大小分块
    chunkDynamic(payload) {
        const chunks = [];
        let currentSize = 2;

        for (let i = 0; i < payload.length; i += currentSize) {
            chunks.push(payload.slice(i, i + currentSize));
            currentSize = (currentSize + 1) % 5 + 2;
        }

        return chunks.join('');
    }

    // 编码方法
    base64Encode(payload) {
        return btoa(payload);
    }

    urlEncode(payload) {
        return encodeURIComponent(payload);
    }

    htmlEncode(payload) {
        return payload
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/'/g, '&#x27;')
            .replace(/\//g, '&#x2F;');
    }

    jsEncode(payload) {
        return payload
            .replace(/\\/g, '\\\\')
            .replace(/'/g, '\\\'')
            .replace(/"/g, '\\"')
            .replace(/\n/g, '\\n')
            .replace(/\r/g, '\\r')
            .replace(/\t/g, '\\t');
    }

    unicodeEncode(payload) {
        return payload.split('').map(char => 
            '\\u' + char.charCodeAt(0).toString(16).padStart(4, '0')
        ).join('');
    }

    hexEncode(payload) {
        return payload.split('').map(char => 
            '\\x' + char.charCodeAt(0).toString(16).padStart(2, '0')
        ).join('');
    }

    // 混淆方法
    obfuscateString(payload) {
        return payload.split('').map(char => 
            `String.fromCharCode(${char.charCodeAt(0)})`
        ).join('+');
    }

    obfuscateEval(payload) {
        return `eval(${this.obfuscateString(payload)})`;
    }

    obfuscateConcat(payload) {
        return payload.split('').map(char => 
            `"${char}"`
        ).join('+');
    }

    obfuscateTemplate(payload) {
        return `\`${payload}\``;
    }

    // 验证绕过效果
    validateBypass(payload, wafType) {
        const validation = {
            success: false,
            evidence: [],
            errors: []
        };

        try {
            // 检查基本语法
            if (payload.includes('<script>')) {
                validation.evidence.push('Script tag detected');
            }

            // 检查事件处理器
            if (payload.match(/on\w+\s*=/i)) {
                validation.evidence.push('Event handler detected');
            }

            // 检查编码
            if (payload.includes('\\u') || payload.includes('\\x')) {
                validation.evidence.push('Encoded characters detected');
            }

            // 检查混淆
            if (payload.includes('eval(') || payload.includes('Function(')) {
                validation.evidence.push('Obfuscated code detected');
            }

            // 检查分割
            if (payload.includes('+') || payload.includes('join(')) {
                validation.evidence.push('Split payload detected');
            }

            // 检查分块
            if (payload.includes('chunk') || payload.includes('slice')) {
                validation.evidence.push('Chunked payload detected');
            }

            validation.success = true;
        } catch (error) {
            validation.errors.push(`Validation error: ${error.message}`);
        }

        return validation;
    }

    // 生成绕过报告
    generateBypassReport(payload, wafType, validation) {
        return {
            timestamp: new Date().toISOString(),
            payload: payload,
            wafType: wafType,
            validation: validation,
            variants: this.generateBypassVariants(payload, wafType),
            recommendations: this.generateBypassRecommendations(payload, wafType, validation)
        };
    }

    // 生成绕过建议
    generateBypassRecommendations(payload, wafType, validation) {
        const recommendations = [];

        // 基于验证结果的建议
        if (!validation.success) {
            recommendations.push({
                type: 'error',
                description: 'Fix payload validation errors',
                priority: 'high'
            });
        }

        // 基于WAF类型的建议
        if (wafType) {
            const waf = this.wafSignatures[wafType];
            recommendations.push({
                type: 'waf',
                description: `Use appropriate bypass techniques for ${wafType}`,
                priority: 'high'
            });
        }

        // 基于证据的建议
        for (const evidence of validation.evidence) {
            recommendations.push({
                type: 'evidence',
                description: `Address evidence: ${evidence}`,
                priority: 'medium'
            });
        }

        return recommendations;
    }

    // 获取响应头
    getResponseHeaders() {
        // 这里需要实现获取响应头的逻辑
        // 由于浏览器安全限制，可能需要通过其他方式获取
        return new Headers();
    }
}

export const wafBypassTechniques = new WAFBypassTechniques();