Add a blocklist covering disabled roots and compromised intermediates

CHANGELOG-roots.md

@@ -35,6 +35,20 @@ roots serve no purpose as trust anchors. The certificate files and the company
 `README.md` (with full rationale and sources) are kept in `roots/Buypass/`.
 See <https://www.buypass.com/products/tls-ssl-certificates/discontinues-issuance-of-tls-ssl-certificates>.
 
+## 2026-10-24 — blocklist: disabled roots and eMudhra intermediates
+
+Added a blocklist that ships in the crate (`cacrt::blocked()`, see `CURATION.md`
+"Blocking intermediates"). It starts with 19 certificates:
+
+- the 3 disabled roots: **emSign ECC Root CA - G3**, **Buypass Class 2 Root CA**
+  and **Buypass Class 3 Root CA**;
+- the 16 compromised eMudhra intermediate certificates (8 keys, each issued by
+  emSign Root TLS/CS CA - G3 and cross-signed by Sectigo AAA Certificate
+  Services), in `blocked/2026-10-emudhra-intermediates/`.
+
+Callers that check every certificate in their chain now reject these even when
+their anchor comes from an OS store that still trusts them.
+
 ## 2026-10-21 — disabled emSign ECC Root CA - G3 (intermediate key compromise)
 
 Disabled **emSign ECC Root CA - G3** (eMudhra Technologies Limited, SHA-256

CURATION.md

@@ -85,10 +85,33 @@ trail intact (we can always see what was once trusted and why it was dropped)
 without deleting history. Record every such change in `CHANGELOG-roots.md`, and
 add a status banner to the company's `README.md`.
 
+A disabled root is also **blocked**: it goes on the blocklist the crate ships
+(`cacrt::blocked()`), so callers that check their whole chain reject it even when
+it comes from another trust store. Every `.disabled` file must carry a
+`# Blocked: <reason>` header line; the build fails without one.
+
 Typical reasons to disable rather than keep a root: the CA has stopped issuing
 TLS certificates and all of its end-entity certificates have since expired (so the
 anchor can no longer serve any live chain), or a root program has distrusted it.
 
+## Blocking intermediates
+
+Some incidents call for distrusting specific CA certificates rather than (or
+before) a whole root, for example an intermediate whose private key is
+compromised. Put each such certificate as a PEM file under
+`blocked/<YYYY-MM>-<incident>/`, with a `# Blocked: <reason>` header and a
+`README.md` for the incident. Include **every** certificate known to carry the
+key, cross-signs included. Never commit private keys there: `blocked/` ships in
+the crate. Evidence that includes keys belongs in `evidence/`, which does not ship.
+
+The build fingerprints each file (SHA-256 of the certificate and of its
+`SubjectPublicKeyInfo`), checks any `# SHA256 fingerprint:` / `# SPKI SHA256:`
+header against the certificate, and fails if a blocked key is also the key of a
+trusted root.
+
+Blocking an intermediate protects only callers that check the blocklist. When a
+root program removes the root itself, disable the root as well.
+
 ## Auditability
 
 Every addition or removal of a root is recorded in

README.md

@@ -56,6 +56,45 @@ for candidate in cacrt::find_by_subject(issuer_der_name) {
 Each `Cert` exposes `der()`, `subject_der()`, `subject_hash()`, `seq()`,
 `label()`, and `hash_name()` (a `Display` value — no allocation needed).
 
+## Blocklist: check the whole chain
+
+Leaving a CA out of the store is not enough when your software also trusts
+another store, such as the operating system's. So `cacrt` also ships a
+**blocklist** of certificates that must never be trusted, wherever they come
+from:
+
+- every root `cacrt` has disabled (`roots/**/*.disabled`), and
+- compromised intermediates (`blocked/`), such as the eMudhra intermediates
+  whose private keys were trivially small integers.
+
+Entries are keyed by the SHA-256 of the certificate **and** of its
+`SubjectPublicKeyInfo`. Matching on the key catches every certificate that
+carries it: cross-signs, reissues and copies we have never seen.
+
+After your verifier has built and accepted a chain, **check every certificate in
+it, leaf to root, including a root that came from the OS store.** A root that
+`cacrt` disabled then stays rejected on systems that still trust it.
+
+```rust
+// For each certificate in the verified chain, root included. Your TLS library
+// already parses the DER; hash the SubjectPublicKeyInfo and the certificate.
+if let Some(b) = cacrt::blocked_by_spki(&spki_sha256)
+    .or_else(|| cacrt::blocked_by_cert(&cert_sha256))
+{
+    return Err(format!("blocked: {} ({})", b.label(), b.reason()));
+}
+```
+
+| Function | Purpose |
+|---|---|
+| `cacrt::blocked() -> &'static [Blocked]` | Every blocked certificate, with `kind()`, `label()`, `reason()` and both hashes. |
+| `cacrt::blocked_by_spki(&[u8; 32]) -> Option<&Blocked>` | Is this **key** blocked? (SHA-256 of the DER SPKI.) |
+| `cacrt::blocked_by_cert(&[u8; 32]) -> Option<&Blocked>` | Is this **certificate** blocked? (SHA-256 of its DER.) |
+
+The blocklist only helps verifiers that call it. Generic TLS stacks (rustls,
+OpenSSL) know nothing about it. Hook it in after normal verification, for
+example from a rustls `ServerCertVerifier` wrapper.
+
 ## The `062cdee6.0` naming
 
 This is exactly OpenSSL's hash-directory filename (`c_rehash` / `openssl

blocked/2026-10-emudhra-intermediates/EM_DV_TLS_CA_G3B.Sectigo_AAA.pem

@@ -0,0 +1,28 @@
+# Label: EM DV TLS CA - G3B (issued by AAA Certificate Services)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: 45A883F349AEDFD5F3A649B5498FFB121712BA8B448F3F2A91DBC5A766FCDDBE
+# SPKI SHA256: EBED6475C2C2D80FCB199F3FE8DD6E6B3CE60B77EB15D4E42C3DEC0C6F5B5105
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

blocked/2026-10-emudhra-intermediates/EM_DV_TLS_CA_G3B.emSign.pem

@@ -0,0 +1,26 @@
+# Label: EM DV TLS CA - G3B (issued by emSign Root TLS CA - G3)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: 42C4ACCD12C4F59597925E1A08A7A90102608543809308D50EC427E118BA1493
+# SPKI SHA256: EBED6475C2C2D80FCB199F3FE8DD6E6B3CE60B77EB15D4E42C3DEC0C6F5B5105
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

blocked/2026-10-emudhra-intermediates/EM_DV_TLS_CA_G3C.Sectigo_AAA.pem

@@ -0,0 +1,28 @@
+# Label: EM DV TLS CA - G3C (issued by AAA Certificate Services)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: 62B7F9868263F72F6911FC78CEAF72C1979158B7368BF648683BB2AA39B02E72
+# SPKI SHA256: 49DD353DC2B919A3770645117D0E60C16115E7D1BC259EEFE734B00EA434FE5F
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

blocked/2026-10-emudhra-intermediates/EM_DV_TLS_CA_G3C.emSign.pem

@@ -0,0 +1,26 @@
+# Label: EM DV TLS CA - G3C (issued by emSign Root TLS CA - G3)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: 0164D7CEAE5BB909C272AF151FF44B1177AE9B47D9424B94F1D9558C30934D19
+# SPKI SHA256: 49DD353DC2B919A3770645117D0E60C16115E7D1BC259EEFE734B00EA434FE5F
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

blocked/2026-10-emudhra-intermediates/EM_EV_TLS_CA_G3B.Sectigo_AAA.pem

@@ -0,0 +1,28 @@
+# Label: EM EV TLS CA - G3B (issued by AAA Certificate Services)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: 579480AEA166290BD3C643589E795FC0D0E54E86505D180F1DFF99EFD3199512
+# SPKI SHA256: E0254C7FCDC265E2F0F8A428DABB75AB4AE039B4872D62F5EE57F0877D5A8A41
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

blocked/2026-10-emudhra-intermediates/EM_EV_TLS_CA_G3B.emSign.pem

@@ -0,0 +1,26 @@
+# Label: EM EV TLS CA - G3B (issued by emSign Root TLS CA - G3)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: E7568FE6E12331F4FD7DE61DA4C7559D0F8EB192A218D4741A3BA75184333838
+# SPKI SHA256: E0254C7FCDC265E2F0F8A428DABB75AB4AE039B4872D62F5EE57F0877D5A8A41
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

blocked/2026-10-emudhra-intermediates/EM_EV_TLS_CA_G3C.Sectigo_AAA.pem

@@ -0,0 +1,28 @@
+# Label: EM EV TLS CA - G3C (issued by AAA Certificate Services)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: FD9D5C2DBBD4995AB69B8D50C439D9527B00529199C2FD01B2174EB58F07021F
+# SPKI SHA256: 5C0660A2B164910D8FF589C18E14552E9E0EC237DCEFE2CB736D41A4811F81A0
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

blocked/2026-10-emudhra-intermediates/EM_EV_TLS_CA_G3C.emSign.pem

@@ -0,0 +1,26 @@
+# Label: EM EV TLS CA - G3C (issued by emSign Root TLS CA - G3)
+# Blocked: eMudhra intermediate private key compromise, 2026-10-17 (trivially small P-384 private keys); see CHANGELOG-roots.md 2026-10-21
+# SHA256 fingerprint: 432EC25F0D28DE9006D97BF752F17BBB2CD41F669933FCB072D9A1148D0261F3
+# SPKI SHA256: 5C0660A2B164910D8FF589C18E14552E9E0EC237DCEFE2CB736D41A4811F81A0
+# Source: https://emudhra.we-have-a-problem.com/impacted-intermediates.json
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----