Mmcp.market

protocol-reverse skill

by zhaoxuya520·zhaoxuya520/reverse-skill·39k stars·MIT

Use for authorized reverse engineering of custom binary protocols, Protobuf/gRPC, WebSocket frames, and PCAP-driven protocol recovery.

A100/100content scan

Is the protocol-reverse skill safe?

Clean: nothing in its files matched our rules. We read 2 files in the folder on 2026-09-28.

No findings.

Install the protocol-reverse skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description. 

git clone --depth 1 https://github.com/zhaoxuya520/reverse-skill.git /tmp/reverse-skill
mkdir -p ~/.claude/skills
cp -r /tmp/reverse-skill/skills/protocol-reverse ~/.claude/skills/protocol-reverse
available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

Protocol Reverse Engineering

ACTION REQUIRED（读完后立刻执行）

  1. NOW: 读取 ../field-journal/precedent-reverse.md — 确认授权与常规操作边界
  2. NOW: 确认任务是否为协议/流量/序列化格式逆向（非纯 Web 参数签名 → 转 js-reverse/）
  3. NOW: 若有目标网络交互 → ../scripts/case-init.ps1 完成 scope；auth 未 granted 禁止对目标 ACT
  4. NEXT: 读取 ../tool-index.md；缺工具 bootstrap（tshark/wireshark 等可能需手动）
  5. ACT: 进入工作流 Phase 1，产出帧布局或消息字典草稿

适用场景

  • 自定义 TCP/UDP 二进制协议
  • Protobuf / gRPC / FlatBuffers / MessagePack
  • WebSocket / MQTT / 私有 RPC
  • PCAP / PCAPNG 还原字段与状态机
  • 客户端-服务端校验、序列号、加密帧头

不走本 skill

工作流

Phase 1 — 采集与分诊

□ 拿到样本：PCAP / 代理导出 / 客户端日志 / 二进制
□ 标记方向：C→S / S→C；是否有握手、心跳、重连
□ 固定头？魔数？长度字段？TLV？定长？
□ 是否压缩（zlib/gzip/lz4）或加密（AES/ChaCha 帧内）
□ tshark -r cap.pcap -T fields -e frame.number -e ip.src -e tcp.payload

Phase 2 — 帧布局还原

□ 对齐多个同类消息，找不变字节 / 自增序列号
□ 长度字段：大端/小端、含头/不含头
□ 校验：CRC16/32、checksum、HMAC 位置
□ 画出状态机：Connect → Auth → Ready → Request/Response → Close
□ 工具：Wireshark 自定义 dissector 草稿 / ImHex / 010 Editor 模板 / Kaitai Struct

Phase 3 — 序列化与加密

□ Protobuf：.proto 恢复（blackboxprotobuf / pbtk / protoc --decode_raw）
□ gRPC：HTTP/2 headers + protobuf body
□ 加密：找密钥派生（客户端 so/dll/JS）→ 联合 ida-reverse / js-reverse / apk-reverse
□ 重放：仅在授权 scope 内；先无害字段再敏感操作

Phase 4 — 产物

MUST 产出：
- 消息类型表（name / opcode / fields）
- 至少 1 条可复现的解码命令或脚本
- Evidence：原始 hex 摘录 + 解码结果（脱敏）

工具链

参考

  • references/protocol-workflow.md — 帧布局与 Protobuf 速查
  • 相关：../ida-reverse/ ../js-reverse/ ../firmware-pentest/ ../pentest-tools/

路由上下文

上游: MASTER-ROUTING R21 · routing.md 下游: 需客户端算法 → ida-reverse/js-reverse；需利用重放 → pentest-tools/api-security 同级: malware-analysis（C2 协议）、digital-forensics（流量取证）

任务完成自检

  • [ ] 是否还原了消息布局或状态机（而非只贴 hex）？
  • [ ] 是否有可复现解码命令？
  • [ ] 是否遵守 scope / 脱敏？
  • [ ] 是否回写 field-journal / 报告 Checklist？

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