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shankar0123
9039cef390
This is a load-bearing internal refactor with no user-visible behavior
change. The new internal/crypto/signer package abstracts CA private-key
signing behind a Signer interface (embeds stdlib crypto.Signer + adds
Algorithm()). The local issuer now consumes this interface; the
historical c.caKey crypto.Signer field is renamed c.caSigner signer.Signer.
What landed:
* internal/crypto/signer/ — new stdlib-only package
- Signer interface: crypto.Signer + Algorithm()
- Algorithm enum: RSA-2048, RSA-3072, RSA-4096, ECDSA-P256, ECDSA-P384
- Driver interface: Load / Generate / Name
- FileDriver: production driver, wraps file-on-disk PEM, hooks for
DirHardener + Marshaler so the local package can inject Bundle 9
keystore.ensureKeyDirSecure + keymem.marshalPrivateKeyAndZeroize
- MemoryDriver: in-memory test driver; safe for concurrent use
- parse.go: ParsePrivateKey moved here from local.go (PKCS#1, SEC 1, PKCS#8)
- 91.6% coverage (gate ≥85)
* internal/connector/issuer/local/local.go — refactor
- Rename c.caKey crypto.Signer → c.caSigner signer.Signer
- Rewire 4 signing call sites: leaf cert (line ~613), CRL (~849),
OCSP response (~887), CA bootstrap (~482) — all access the
interface; the bootstrap also switches to interface-level
Public() + Signer
- Wrap freshly-generated and freshly-loaded keys; reject Ed25519
and other unsupported algorithms at load time (was silently
accepted before, would have failed at first sign)
- Delete the duplicated parsePrivateKey helper (single source of
truth now lives in the signer package)
- Update the L-014 threat-model comment block (lines 1-29) with a
forward-reference paragraph: file-on-disk caveats apply only to
FileDriver-backed signers; alternative drivers close that leg
- Coverage 86.7 → 86.5 (above CI floor of 86); the 0.2pp drop is
mechanical from deleting parsePrivateKey, partially recovered by
a new test pinning the Wrap error path
* internal/crypto/signer/equivalence_test.go — Phase 3 safety net
- RSA byte-strict equality for leaf certs / CRLs / OCSP responses
(PKCS#1 v1.5 is deterministic)
- ECDSA TBS-strict equality (signature differs because of random k)
- Both signatures independently validate against the CA
- Negative sentinel proves the equivalence checker isn't trivially-
passing
* docs/architecture.md — new 'CA Signing Abstraction' section under
Security Model, with ASCII diagram of FileDriver / MemoryDriver /
future PKCS11Driver / future CloudKMSDriver
* Test file mechanical edits (only):
- bundle9_coverage_test.go: parsePrivateKey → signer.ParsePrivateKey
(function moved, not behavior changed)
- local_test.go: append one targeted test
(TestSubCA_LoadCAFromDisk_RejectsUnsupportedKeyAlgorithm) that
pins the new Wrap error path I introduced — recovers coverage
cost of the deletion above
What did NOT change (verified empty diffs):
* api/openapi.yaml
* migrations/
* internal/connector/issuer/interface.go
* go.mod / go.sum (no new dependencies; stdlib only)
This refactor is the prerequisite for three downstream items:
- PKCS#11/HSM driver (V3-Pro)
- CRL/OCSP responder (V2)
- SSH CA lifecycle (V2)
Each of those adds a new signing call site. Doing the abstraction now
costs once; deferring would cost three times.
69 lines
2.7 KiB
Go
69 lines
2.7 KiB
Go
package signer
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import (
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"crypto"
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"encoding/pem"
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"fmt"
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"crypto/x509"
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)
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// parsePrivateKey parses a PEM block into a crypto.Signer. Recognises the
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// three PEM block types historically produced and consumed by certctl's
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// local CA:
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//
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// - "RSA PRIVATE KEY" (PKCS#1 / RFC 3447, openssl genrsa default)
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// - "EC PRIVATE KEY" (SEC 1 / RFC 5915, openssl ecparam default)
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// - "PRIVATE KEY" (PKCS#8 / RFC 5208 — wraps RSA, ECDSA, others)
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//
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// This function is the single source of truth for PEM private-key parsing
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// inside certctl. It was moved here from
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// internal/connector/issuer/local/local.go as part of the Signer
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// abstraction work; the local package now calls into here. Do not
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// reintroduce a parallel implementation elsewhere.
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//
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// Behavior preserved exactly across the move:
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// - Block type matching is case-sensitive (PEM convention).
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// - PKCS#8 blocks that contain a non-Signer key (e.g., a Diffie-Hellman
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// key, an Ed25519 key absent stdlib Signer support) return an error
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// rather than a panic.
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// - The error wrapping format is intentionally stable so existing test
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// assertions in internal/connector/issuer/local/local_test.go and
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// bundle9_coverage_test.go continue to match without modification.
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func parsePrivateKey(block *pem.Block) (crypto.Signer, error) {
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switch block.Type {
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case "RSA PRIVATE KEY":
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return x509.ParsePKCS1PrivateKey(block.Bytes)
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case "EC PRIVATE KEY":
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return x509.ParseECPrivateKey(block.Bytes)
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case "PRIVATE KEY":
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// PKCS#8 — can contain RSA or ECDSA
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key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
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if err != nil {
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return nil, fmt.Errorf("failed to parse PKCS#8 key: %w", err)
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}
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signer, ok := key.(crypto.Signer)
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if !ok {
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return nil, fmt.Errorf("PKCS#8 key is not a signing key")
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}
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return signer, nil
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default:
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return nil, fmt.Errorf("unsupported private key type: %s (expected RSA PRIVATE KEY, EC PRIVATE KEY, or PRIVATE KEY)", block.Type)
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}
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}
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// ParsePrivateKey is the exported wrapper used by callers outside this
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// package. It exists so that internal/connector/issuer/local/ (and any
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// future caller that needs to load a PEM private key without going
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// through a Driver — e.g., a one-off tool, a migration helper) can
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// share the parser without re-implementing the block-type dispatch.
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//
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// Most callers should use a Driver instead — Driver.Load handles the
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// file-read + PEM decode + key parse + Signer wrap in one call.
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// ParsePrivateKey is exposed for the corner cases where a caller
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// already holds the *pem.Block (e.g., the block was extracted from a
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// multi-block PEM bundle).
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func ParsePrivateKey(block *pem.Block) (crypto.Signer, error) {
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return parsePrivateKey(block)
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}
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