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5 Commits
| Author | SHA1 | Message | Date | |
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 shankar0123
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b22cdb3405 |
fix(signer): Hotfix #15 — gofmt comment-indent fix from Hotfix #13
CI run on commit |
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shankar0123
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38f86bca86 |
fix(signer): Hotfix #13 — CodeQL #29 go/path-injection in FileDriver sinks
CodeQL alert #29 (severity: HIGH, rule: go/path-injection) has been open on master for 2 weeks despite Phase 6 commit |
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shankar0123
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21aeed4f4e |
legal: addlicense headers + normalize legacy variants (Phase 0 RED-4)
Phase 0 closure (Path B2, post-rewrite):
addlicense sweep — adds the canonical certctl LLC copyright + BUSL-1.1
SPDX header to every production Go file. Template:
// Copyright 2026 certctl LLC. All rights reserved.
// SPDX-License-Identifier: BUSL-1.1
Coverage: 338 / 338 production Go files (cmd/ + internal/, excluding
*_test.go and **/testdata/**). Pre-sweep coverage was 22 / 338 (6.5%);
post-sweep is 338 / 338 (100%).
Normalized 22 pre-existing legacy headers (`// Copyright (c) certctl`
+ `// SPDX-License-Identifier: BSL-1.1`) and 1 file using a
`Certctl Contributors` attribution. The legacy SPDX ID `BSL-1.1`
is non-standard; the official SPDX identifier for Business Source
License 1.1 is `BUSL-1.1` (capital U). All 338 files now share the
canonical form.
Generated via:
addlicense -c "certctl LLC" -y 2026 \
-f cowork/legal/copyright-header.tpl \
-ignore '**/testdata/**' -ignore '**/*_test.go' \
cmd/ internal/
Verification:
find cmd internal -name '*.go' -not -name '*_test.go' \
-not -path '*/testdata/*' \
-exec grep -L '^// Copyright 2026 certctl LLC' {} \; | wc -l
Returns: 0
gofmt clean. Header additions are comments only, no compile impact.
Closes: cowork/certctl-architecture-diligence-audit.html#fix-RED-4
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shankar0123
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d08982fc19 |
security(signer): bound FileDriver paths with SafeRoot + reject .. (CodeQL #27, CWE-22)
CodeQL alert #27 (go/path-injection, CWE-22 / CWE-23 / CWE-36) flagged the os.WriteFile sink at internal/crypto/signer/file_driver.go:194 because the outPath flowed from operator-supplied config (CAKeyPath in the local issuer's encrypted config blob -> GenerateOutPath closure -> os.WriteFile) without a containment check. Threat model: Production wiring (cmd/server/main.go) constructs &signer.FileDriver{} and the local-issuer NewConnector wires GenerateOutPath off Config.CAKeyPath. CAKeyPath ships from the encrypted issuer config in PostgreSQL — settable only by an authenticated admin via the API. So the realistic exploit is: (a) Admin compromise -> CAKeyPath set to /etc/passwd -> FileDriver.Generate overwrites system files. (b) Future code path concatenates attacker-controlled fragments into the output path -> classic ../../etc/passwd traversal. Defense in depth: bound the write surface so admin-key-rotation errors and future regressions can't escape into arbitrary filesystem writes. Fix: internal/crypto/signer/file_driver.go gains: - SafeRoot string field on FileDriver. When set, every Load + Generate path MUST resolve under SafeRoot via filepath.Abs + strings.HasPrefix on cleaned paths. - validateSafePath helper that: * rejects empty paths * filepath.Clean()s the input * rejects paths whose cleaned form still contains a literal ".." segment (catches relative paths that escape above their start; absolute paths get collapsed by Clean) * resolves to filepath.Abs and (when SafeRoot non-empty) verifies containment via filepath.Separator-suffixed HasPrefix (the bare-prefix bug — SafeRoot=/var/lib/foo erroneously accepting /var/lib/foobar — has its own regression test below) - Load + Generate now call validateSafePath before any os.ReadFile / os.WriteFile. The validator is in the same function as the sink so CodeQL recognizes it as a guard. Tests (internal/crypto/signer/signer_test.go): TestFileDriver_Load_RejectsParentTraversal — relative path "../../etc/passwd" rejected with parent-directory error. TestFileDriver_Load_RejectsEmptyPath — empty path rejected. TestFileDriver_Generate_RejectsParentTraversal — write side, same pattern. TestFileDriver_SafeRoot_AcceptsContainedPath — happy path: a key file under SafeRoot succeeds. TestFileDriver_SafeRoot_RejectsEscape — absolute path outside SafeRoot rejected (the load-bearing CodeQL pin). TestFileDriver_SafeRoot_RejectsSiblingPrefix — pins the HasPrefix-with-separator subtlety: SafeRoot=/tmp/X must NOT accept /tmp/X-sibling. Verified locally: gofmt: clean. go vet ./...: exit 0. go test -short -count=1 ./internal/crypto/signer/...: ok 1.605s go test -short -count=1 ./internal/connector/issuer/local/...: ok 4.908s (downstream FileDriver consumer) go test -short -count=1 ./internal/service/...: ok 4.029s Backwards-compat: when SafeRoot is unset, only the structural .. + empty-path checks fire — the existing FileDriver call sites in cmd/server/main.go and the existing unit tests pass unchanged. Production wiring SHOULD set SafeRoot via cmd/server/main.go in a follow-up commit (env-var-supplied CERTCTL_CA_KEY_DIR or similar). Reference: https://github.com/certctl-io/certctl/security/code-scanning/27 Closes CodeQL alert #27 (go/path-injection). |
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shankar0123
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9039cef390 |
crypto/signer: introduce Signer interface; refactor local issuer to use it
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.
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