Replace deprecated csurf with csrf-csrf

csurf has been deprecated since 2022 and pins an old cookie release
with a known advisory; npm's only fix is a downgrade (issue #1634,
item 2). csrf-csrf v4 implements the same double-submit-cookie pattern
with an HMAC-signed, session-bound token keyed on the existing boot
secret (common.secret_key).

The frontend contract is unchanged: the token still arrives via the
XSRF-TOKEN cookie/header and is echoed as x-xsrf-token (all token
sources csurf accepted are still read), the signed cookie keeps the
_csrf name (now httpOnly, secure:false to match the session cookie on
plain-HTTP deployments), doubleCsrfProtection attaches req.csrfToken
so app.ts keeps working, and the error code is EBADCSRFTOKEN - already
handled in app.ts. The websocket upgrade check in authCheck.ts now
routes through the shared middleware; upgrade requests are GETs, so
its pass-through semantics are unchanged.

One fix this surfaced: app.ts called req.csrfToken() twice (cookie and
header). Under csurf every token validated against a stable secret;
under csrf-csrf each first-visit call mints a new token, desyncing the
XSRF-TOKEN cookie from the _csrf cookie it must equal. The token is
now generated once per request.

Tokens are session-bound, so a token stolen from one session no longer
validates in another - a check csurf's cookie mode did not perform.

Production npm audit drops from 6 low findings to 4, all in the
crypto-browserify/elliptic chain tracked in #1634.

Verified against the docker regtest fixture: both API suites (43
checks across LND, CLN and Eclair) plus a dedicated CSRF battery -
valid-token auth, missing token 403, garbage token 403, cross-session
replay 403, token stability across requests, the XSRF-TOKEN response
header for Quickpay, and the websocket handshake. Lint and build are
clean.
This commit is contained in:
saubyk 2026-07-19 17:03:53 -07:00 committed by Suheb
parent 6e61d1b759
commit e617fbb561
9 changed files with 114 additions and 110 deletions

135
package-lock.json generated
View file

@ -18,7 +18,7 @@
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"cookie-parser": "1.4.7",
"crypto-browserify": "3.12.1",
"csurf": "1.11.0",
"csrf-csrf": "4.0.3",
"express": "5.2.1",
"express-session": "1.18.2",
"hocon-parser": "1.0.1",
@ -9274,18 +9274,48 @@
"url": "https://github.com/sponsors/ljharb"
}
},
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"node_modules/css-loader": {
@ -9367,31 +9397,6 @@
"node": ">=4"
}
},
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"resolved": "https://registry.npmjs.org/csurf/-/csurf-1.11.0.tgz",
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"deprecated": "This package is archived and no longer maintained. For support, visit https://github.com/expressjs/express/discussions",
"license": "MIT",
"dependencies": {
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"csrf": "3.1.0",
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},
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@ -11953,40 +11958,6 @@
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"toidentifier": "1.0.0"
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"node": ">= 0.6"
}
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"license": "MIT",
"engines": {
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@ -16995,12 +16966,6 @@
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@ -17661,12 +17626,6 @@
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@ -18636,15 +18595,6 @@
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