Mmcp.market

competition-kerberos-delegation skill

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

Internal downstream skill for ctf-sandbox-orchestrator. CTF-sandbox workflow for Kerberos delegation, SPN trust edges, S4U abuse, RBCD, constrained or unconstrained delegation, and service-ticket acceptance. Use when the user asks about constrained delegation, unconstrained delegation, RBCD, S4U, SPNs, ticket acceptance, or how a Kerberos trust edge turns into effective privilege under sandbox assumptions. Use only after `$ctf-sandbox-orchestrator` has already established sandbox assumptions and routed here.

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Install the competition-kerberos-delegation 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/CTF-Sandbox-Orchestrator/competition-kerberos-delegation ~/.claude/skills/competition-kerberos-delegation
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

Competition Kerberos Delegation

Use this skill only as a downstream specialization after $ctf-sandbox-orchestrator is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to $ctf-sandbox-orchestrator first.

Use this skill when the hard part is not "is there Kerberos here," but which delegation edge exists, which ticket is being minted, and which service really accepts it.

Reply in Simplified Chinese unless the user explicitly requests English.

Quick Start

  1. Write the trust chain first: principal -> delegation edge -> ticket type -> target SPN -> accepting service -> resulting privilege.
  2. Separate ticket possession from accepted privilege.
  3. Keep SPNs, delegation mode, PAC/group data, encryption type, and service acceptance in one compact evidence block.
  4. Reproduce one minimal delegation chain before broadening into variants.
  5. Tie every privilege claim to a specific accepted ticket or service-side effect.

Workflow

1. Identify The Delegation Edge

  • Determine whether the path is constrained delegation, unconstrained delegation, resource-based constrained delegation, protocol transition, or another trust edge.
  • Inspect SPNs, ACLs, service accounts, SIDHistory, certificate templates, and replication rights only when they affect the active path.

2. Trace Ticket Minting And Acceptance

  • Record TGT/TGS type, S4U steps when relevant, delegation flags, PAC or group data, encryption type, cache location, and target SPN.
  • Prove which service actually accepts the ticket and what capability appears after acceptance.

3. Report The Effective Edge

  • Compress the chain into one replayable path, not a vague "domain compromise" statement.
  • Separate candidate edges from the edge that really lands privilege.

Read This Reference

  • Load references/kerberos-delegation.md for the delegation checklist, ticket fields to preserve, and common proof mistakes.

What To Preserve

  • SPN, ticket type, delegation mode, PAC/group data, encryption type, cache location, accepting service
  • Service-side logs, event IDs, logon session changes, or group changes proving effective privilege
  • The exact trust edge that makes the ticket replayable

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