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e93bc11f6f
Add javascript/ssrf-ipv6-transition-incomplete-guard, an experimental @kind problem query that flags hand-rolled SSRF host guards which reject private/loopback IPv4 ranges but never unwrap IPv6-transition forms (IPv4-mapped ::ffff:, NAT64 64:ff9b::, 6to4 2002::). Such guards can be bypassed by wrapping an internal IPv4 address in a transition literal. Includes a .qhelp with good/bad examples, a change note, and a test pack with two true-positive fixtures (private-ip package guard and a hand-written RFC 1918 denylist) and two negative-control fixtures (ipaddr.js range classifier and an explicit ::ffff: unwrap). Signed-off-by: tonghuaroot <23011166+tonghuaroot@users.noreply.github.com>
17 lines
621 B
JavaScript
17 lines
621 B
JavaScript
const ipaddr = require('ipaddr.js');
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const fetch = require('node-fetch');
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// OK: ipaddr.js parses the address and classifies it with `.range()`, which is
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// transition-aware. `::ffff:10.0.0.1` parses as an IPv4-mapped address and is
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// reported in the `private` range, so the guard is complete.
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async function validateTargetHost(host) { // OK
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const addr = ipaddr.parse(host);
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const range = addr.range();
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if (range === 'private' || range === 'loopback' || range === 'linkLocal') {
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throw new Error('blocked internal host');
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}
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return fetch('http://' + host + '/');
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}
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module.exports = { validateTargetHost };
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