docker: ghcr.io/coinos/bun, oven/bun with the distrusted emSign G3 root swapped outHEADmaster

bun-distrust.ts now carries the root's DER itself instead of finding it
through tls.getCACertificates, so it works on any bun image.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 22 insertions, 21 deletions

diff --git a/docker/bun-distrust.ts b/docker/bun-distrust.ts
index 5137883a..df27f619 100644
--- a/docker/bun-distrust.ts
+++ b/docker/bun-distrust.ts
@@ -1,40 +1,41 @@
-// Bun compiles Mozilla's root store into its binary, and NODE_USE_SYSTEM_CA
+// Bun (1.4+) compiles Mozilla's root store into its binary as DER, and NODE_USE_SYSTEM_CA
 // only adds to it. Until a Bun release drops a distrusted root, overwrite its
 // DER in place with a same-length self-signed placeholder whose key was thrown
 // away (zeroing it instead makes every TLS handshake fail).
 //
-// emSign ECC Root CA - G3: eMudhra intermediate key compromise, CVE-2026-111943.
+// Usage: bun bun-distrust.ts <path to a bun binary> (not the one running it)
 import { readFileSync, writeFileSync } from "node:fs";
-import { getCACertificates } from "node:tls";
-import { X509Certificate } from "node:crypto";
 
-const distrust = {
-  "emSign ECC Root CA - G3":
-    "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",
-};
+const distrust = [
+  {
+    // eMudhra intermediate key compromise, CVE-2026-111943.
+    // sha256 86:A1:EC:BA:08:9C:4A:8D:3B:BE:27:34:C6:12:BA:34:1D:81:3E:04:3C:F9:E8:A8:62:CD:5C:57:A3:6B:BE:6B
+    name: "emSign ECC Root CA - G3",
+    der: "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",
+    placeholder:
+      "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",
+  },
+];
 
 const bin = process.argv[2];
 const buf = readFileSync(bin);
 let patched = false;
 
-for (const [cn, placeholder] of Object.entries(distrust)) {
-  const pem = getCACertificates("bundled").find(
-    (p) => new X509Certificate(p).subject.split("\n").includes(`CN=${cn}`),
-  );
-  if (!pem) {
-    console.log(`${cn}: not in bun's root store, nothing to do`);
-    continue;
-  }
-  const der = new X509Certificate(pem).raw;
+for (const { name, der: d, placeholder } of distrust) {
+  const der = Buffer.from(d, "base64");
   const repl = Buffer.from(placeholder, "base64");
   if (repl.length !== der.length)
-    throw new Error(`${cn}: placeholder is ${repl.length} bytes, need ${der.length}`);
+    throw new Error(`${name}: placeholder is ${repl.length} bytes, need ${der.length}`);
   const at = buf.indexOf(der);
-  if (at < 0 || buf.indexOf(der, at + 1) >= 0)
-    throw new Error(`${cn}: expected exactly one copy in ${bin}`);
+  if (at < 0) {
+    console.log(`${name}: not in ${bin}, nothing to do`);
+    continue;
+  }
+  if (buf.indexOf(der, at + 1) >= 0)
+    throw new Error(`${name}: more than one copy in ${bin}`);
   repl.copy(buf, at);
   patched = true;
-  console.log(`${cn}: replaced at offset ${at}`);
+  console.log(`${name}: replaced at offset ${at}`);
 }
 
 if (patched) writeFileSync(bin, buf);