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Cheap wins before brute-forcing: try AXFR and detect NSEC-walkable zones

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评估

难度
5/5
预计耗时
一周以上
新手友好度
35/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
go

调研方向

Start by reading the CLI options and DNS query, rate-limit, and query-accounting paths; the issue also points to the miekg/dns migration proposed in #50. Check how existing tests run and whether they provide a test server that allows AXFR. Done means the transfer is reported, its names are merged into results, and all relevant queries count against the configured limits.

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描述

area: dns feature priority: low

Why it matters

  • A misconfigured authoritative server that allows zone transfer (AXFR) gives the complete answer in one query, versus millions of brute-force queries.
  • Zones signed with plain NSEC (not NSEC3) can be walked to list every name.

Checking both first is standard tradecraft (dnsrecon, fierce). It costs almost nothing, and it fits subenum's "minimize queries, trust the result" positioning.

Proposal

  • -axfr (or on by default with a notice):
    • Look up the target's NS records.
    • Attempt AXFR against each authoritative server.
    • On success, report the zone transfer as a finding and merge the names into the results, tagged source: axfr.
  • Detect NSEC versus NSEC3 and print a notice when the zone is walkable. Walking it could be a later -nsec-walk.
  • Charge these queries against -rate and -max-queries.
  • Probably requires the miekg/dns migration proposed in #50, since the stdlib resolver can't do AXFR.

Done when

Against a test server allowing AXFR, subenum reports the transfer and every name in the zone, with the queries counted.

主要语言
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环境准备

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从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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