certs: block compromised eMudhra intermediates (CVE-2026-111943)

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Dev Scribe authored and Cuong Manh Le committed 2026-10-22 20:08:44 +07:00
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@@ -12,7 +12,7 @@
# ctrld for the target platform, so no build step runs under qemu emulation.
# buildx sets BUILDPLATFORM and the TARGET* arguments from --platform, e.g.
# linux/arm/v7 gives TARGETOS=linux, TARGETARCH=arm, TARGETVARIANT=v7.
FROM --platform=$BUILDPLATFORM golang:1.27-bookworm AS base
FROM --platform=$BUILDPLATFORM golang:1.27.3-bookworm AS base
WORKDIR /app
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@@ -12,7 +12,7 @@
# ctrld for the target platform, so no build step runs under qemu emulation.
# buildx sets BUILDPLATFORM and the TARGET* arguments from --platform, e.g.
# linux/arm/v7 gives TARGETOS=linux, TARGETARCH=arm, TARGETVARIANT=v7.
FROM --platform=$BUILDPLATFORM golang:1.27-bookworm AS base
FROM --platform=$BUILDPLATFORM golang:1.27.3-bookworm AS base
WORKDIR /app
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@@ -2,6 +2,8 @@ module github.com/Control-D-Inc/ctrld
go 1.26.0
toolchain go1.26.10
require (
github.com/Masterminds/semver/v3 v3.2.1
github.com/ameshkov/dnsstamps v1.0.3
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package certs
import (
"bytes"
"crypto/x509"
"embed"
"encoding/pem"
"errors"
"testing"
"time"
)
// The fixtures are embedded rather than read from disk: test:windows runs
// cross-compiled test binaries with no source checkout (GIT_STRATEGY: none).
//
//go:embed testdata/*.pem
var testdata embed.FS
// Chains served by the eMudhra disclosure test hosts
// (https://emudhra.we-have-a-problem.com/chains.zip, captured 2026-10-20).
// Each file is leaf first, then the intermediates the host sends. The
// intermediate keys are publicly recoverable (CVE-2026-111943), so none of
// these chains may verify.
var emudhraChains = []string{
// EM DV TLS CA - G3B -> emSign Root TLS CA - G3 -> emSign ECC Root CA - G3
"dv-g3b-emudhra.we-have-a-problem.com.pem",
// EM DV TLS CA - G3B cross-signed by AAA Certificate Services
"dv-g3b-aaa-emudhra.we-have-a-problem.com.pem",
}
// verifyAt is inside every certificate's validity window, so a rejection
// below comes from trust, not from expiry.
var verifyAt = time.Date(2026, time.October, 21, 0, 0, 0, 0, time.UTC)
func readCerts(t *testing.T, name string) []*x509.Certificate {
t.Helper()
b, err := testdata.ReadFile("testdata/" + name)
if err != nil {
t.Fatal(err)
}
return parsePEMCerts(t, name, b)
}
func parsePEMCerts(t *testing.T, name string, b []byte) []*x509.Certificate {
t.Helper()
var certs []*x509.Certificate
for {
var block *pem.Block
block, b = pem.Decode(b)
if block == nil {
break
}
if block.Type != "CERTIFICATE" {
continue
}
c, err := x509.ParseCertificate(block.Bytes)
if err != nil {
t.Fatalf("%s: %v", name, err)
}
certs = append(certs, c)
}
if len(certs) == 0 {
t.Fatalf("%s: no certificates", name)
}
return certs
}
func verifyChain(t *testing.T, name string, roots *x509.CertPool) error {
t.Helper()
chain := readCerts(t, name)
inter := x509.NewCertPool()
for _, c := range chain[1:] {
inter.AddCert(c)
}
_, err := chain[0].Verify(x509.VerifyOptions{
DNSName: chain[0].Subject.CommonName,
Roots: roots,
Intermediates: inter,
CurrentTime: verifyAt,
})
return err
}
// requireTrustRejection fails unless err is a trust rejection. Any other
// verification error (hostname mismatch, expiry after verifyAt drifts, a
// broken fixture) would let the chain checks pass without proving anything.
func requireTrustRejection(t *testing.T, name string, err error) {
t.Helper()
if err == nil {
return
}
t.Logf("%s: %v", name, err)
var hostErr x509.HostnameError
if errors.As(err, &hostErr) {
t.Errorf("%s: rejected for hostname, not trust: %v", name, err)
}
var invErr x509.CertificateInvalidError
if errors.As(err, &invErr) && invErr.Reason == x509.Expired {
t.Errorf("%s: rejected for expiry, not trust: %v", name, err)
}
}
// The embedded bundle is the only trust store on DD-WRT (upstream DoH/DoT/DoQ)
// and on Android (Control D API), so it must not contain the affected roots.
// This checks the bundle contents directly: on a fixed toolchain the chain
// verification below passes even with the affected roots present.
func TestCACertBundleExcludesAffectedEMudhraRoots(t *testing.T) {
bundle := parsePEMCerts(t, "cacert.pem", caRoots)
for _, root := range readCerts(t, "emudhra-roots.pem") {
for _, c := range bundle {
// Raw catches the exact certificate; subject + key also catches a
// re-issued form of the same root.
if bytes.Equal(c.Raw, root.Raw) ||
(bytes.Equal(c.RawSubject, root.RawSubject) &&
bytes.Equal(c.RawSubjectPublicKeyInfo, root.RawSubjectPublicKeyInfo)) {
t.Errorf("embedded cacert.pem contains affected root %q", root.Subject.CommonName)
}
}
}
}
func TestCACertPoolRejectsCompromisedEMudhraChains(t *testing.T) {
for _, name := range emudhraChains {
err := verifyChain(t, name, CACertPool())
if err == nil {
t.Errorf("%s: embedded cacert.pem trusts a compromised eMudhra intermediate", name)
continue
}
requireTrustRejection(t, name, err)
}
}
// Every other platform verifies against the OS store, which may still carry
// the affected roots. Go 1.26.10 / 1.27.3 reject the compromised intermediates
// inside crypto/x509 regardless of roots; this fails if the build toolchain
// predates that fix.
func TestToolchainRejectsCompromisedEMudhraIntermediates(t *testing.T) {
roots := x509.NewCertPool()
for _, c := range readCerts(t, "emudhra-roots.pem") {
roots.AddCert(c)
}
for _, name := range emudhraChains {
err := verifyChain(t, name, roots)
if err == nil {
t.Errorf("%s: crypto/x509 accepted a compromised eMudhra intermediate with its root trusted; build with go1.26.10+ or go1.27.3+", name)
continue
}
requireTrustRejection(t, name, err)
}
}
@@ -0,0 +1,38 @@
-----BEGIN CERTIFICATE-----
MIICQDCCAcagAwIBAgIUU3mgjls/8ZJ8upmukdlSQR1IF/UwCgYIKoZIzj0EAwIw
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TcVPHA==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
@@ -0,0 +1,56 @@
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
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-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
+47
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@@ -0,0 +1,47 @@
# Roots the compromised eMudhra intermediates chain to, from
# https://emudhra.we-have-a-problem.com/roots.json (captured 2026-10-21).
# Used only by tests, never as a trust store.
# emSign ECC Root CA - G3
-----BEGIN CERTIFICATE-----
MIICTjCCAdOgAwIBAgIKPPYHqWhwDtqLhDAKBggqhkjOPQQDAzBrMQswCQYDVQQG
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-----END CERTIFICATE-----
# AAA Certificate Services
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----