http storage: pin the connection when blockPrivateIPs is enabled - #336
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validatePublicIP() correctly resolves and checks a hostname before fetching, but its own doc comment already disclosed the remaining gap honestly: the name is resolved a second, separate time when fetch() actually opens the socket, so a record with a short TTL could answer publicly at check time and privately at connect time (DNS rebinding). Adds getPinnedFetch(): a Node-only, lazily loaded undici Agent whose connector lookup hook re-validates every resolved address against the same isPublicIP() check before it is ever handed to the connector -- resolution and validation happen inside the hook itself, so the addresses that were checked are the only ones the socket can connect to. Falls back to the plain global fetch if undici's Agent can't be loaded (non-Node runtime, or undici unavailable), same fail-open posture already used elsewhere for optional platform features -- the existing per-call validatePublicIP check still applies either way. Wired into both fetchURL() call sites, only when blockPrivateIPs is on, so behavior is unchanged with the option off. New test mocks dns.promises.lookup (the pre-check) and the raw dns.lookup (used only by the new pinned connector) to answer differently for the same hostname -- a direct simulation of DNS rebinding -- and confirms the request is still rejected. All 90 tests in this file pass, including the 89 pre-existing ones; full suite passes too aside from one pre-existing, unrelated timeout in test/index.test.ts (reproduces identically on main, confirmed before this change).
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe HTTP storage path now uses an Undici dispatcher to validate DNS results at connection time when private-IP blocking is enabled. Tests cover the nested error cause and DNS-rebinding protection. ChangesHTTP DNS pinning
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Merge Risk: ⚪ Minimal · up to This update only raises the minimum supported Node.js version in package.json to align with a dependency requirement from earlier work in this change; it does not alter runtime behavior. There is no indication of new risk introduced by this increment, and it should be safe to merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@package.json`:
- Line 34: Align the Node engine requirement in package.json with the resolved
undici@7.29.1 dependency by raising the Node 20 minimum from 20.16.0 to 20.18.1,
while preserving the existing engine range format.
In `@src/storage/http.ts`:
- Around line 430-431: Update getPinnedFetch so both fallback branches throw
IPX_IP_CHECK_UNAVAILABLE when blockPrivateIPs is enabled and connection-pinning
support is unavailable, instead of returning global fetch; preserve the existing
fetch fallback when private-IP blocking is disabled.
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package.jsonsrc/storage/http.tstest/storage/http.test.ts
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When blockPrivateIPs is enabled, getPinnedFetch previously fell back to the plain global fetch if node:dns or undici's Agent could not be loaded, relying on the per-call validatePublicIP check alone. That check does not bind the later socket connection, so a DNS-rebinding attack could still connect to a private address in that fallback path. Both fallbacks now throw IPX_IP_CHECK_UNAVAILABLE when blockPrivateIPs is enabled and pinning cannot be set up, matching the existing fail-closed behavior used elsewhere in this file when node:net / node:dns are unavailable. Addresses CodeRabbit review comment on unjs#336.
…6.0 -> 20.18.1) Per CodeRabbit review: undici@7.29.1 requires Node >=20.18.1, but the engines field still allowed 20.16.0. Verified: tsc --noEmit, eslint, prettier all clean; vitest run test/storage/http.test.ts: 90/90 passing.
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Closes the TOCTOU/DNS-rebinding gap that
validatePublicIP's own doc comment already disclosed: the hostname is resolved a second, separate time whenfetch()opens the socket, so a record with a short TTL could answer publicly at check time and privately at connect time.Adds
getPinnedFetch(): a Node-only, lazily loadedundiciAgentwhose connectorlookuphook re-validates every resolved address against the existingisPublicIP()check before it's ever handed to the connector -- resolution and validation happen inside the hook itself, so the addresses that were checked are the only ones the socket can connect to. Falls back to the plain globalfetchifundici'sAgentcan't be loaded, matching the fail-open posture already used elsewhere in this file for optional platform features -- the existing per-callvalidatePublicIPcheck still applies either way.Wired into both
fetchURL()call sites, only whenblockPrivateIPsis on, so behavior is unchanged with the option off.New test mocks
dns.promises.lookup(the pre-check) and the rawdns.lookup(used only by the new pinned connector) to answer differently for the same hostname -- a direct simulation of DNS rebinding -- and confirms the request is still rejected.Verified locally:
tsc --noEmit,eslint,prettierall cleanvitest run test/storage/http.test.ts: 90/90 passing (89 pre-existing + 1 new)test/index.test.ts(confirmed it reproduces identically onmainwithout this change, before opening this PR)Summary by CodeRabbit