feat(vault): configure Vault trust roots and settle the crypto provider - #53
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Four backlog items on the `[vault]` hop, landing together because three of them touch the same files. TASK-0740 — `[vault] ca_cert` and `[vault] ca_path` are config fields, with `VAULT_CACERT` / `VAULT_CAPATH` as the fallback. The config field wins where both are set, and the override is logged at WARN naming the file in force: the two disagreeing is a deployment mistake in every case, and an operator watching an exported variable be ignored has no other way to find out. Trust roots are add-only, so unlike `VAULT_SKIP_VERIFY` the environment keeps a say — but the built-in root set is webpki's, not the host's, so for a Vault behind an internal CA one of these is the only path to a working connection at all, and a setting a deployment cannot start without belongs in the file that deployment ships. The files are read *and parsed* by `VaultConfig::resolve`, which now carries the certificates on `VaultSetup` rather than the paths. A setup that exists is one whose trust roots were readable, so the connect path cannot fail on a `ca_cert` typo and cannot read a different file than the one that was checked (CL-3). `Error::CaRoots` and `Error::CaRootsEmpty` name which of the two spellings was in force, because that is exactly what an operator cannot see from outside. TASK-0739 — `reqwest` moves to `rustls-tls-webpki-roots-no-provider` and `dbsec-vault` takes a direct `rustls` dependency, so `aws-lc-rs` is the only provider in the graph and all three TLS hops negotiate under one policy instead of under whichever crate installed first. The recorded blocker — `Client::build()` panicking under that feature with no process-level provider — is closed twice over: naming `rustls` makes the provider count exactly one, so rustls resolves it unaided, and `install_provider` installs it first anyway for a consumer who enables a second. `install_crypto_provider` keeps the half that was never about the ambiguity, and says so. Eight packages leave the lockfile with `__rustls-ring`, all of it reqwest's HTTP/3 path. TASK-0741 — the DEK plaintext copy in the transport's read buffer is recorded as accepted rather than left open. Streaming into a `Zeroizing` buffer does not close it: every chunk is a slice of the same connection-owned buffer, so the rewrite would move the copy and add one of its own. What is left is one allocator free long, in freed heap, and is covered by the core-dump and swap answers already in place. TASK-0738 — `clippy.toml` still sets no `msrv`, and now says why. Clippy takes the MSRV from `[package] rust-version` when the file names none, so the MSRV-gated lints were already checked per crate; a key here would override that, and this workspace has three answers to override it with. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: CHILL Plan: Team Run ID: 📒 Files selected for processing (2)
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughChangesThe Vault integration resolves custom CA certificates during configuration. Parsed roots flow into Reqwest clients. Reqwest uses the no-provider Rustls feature with an explicit AWS-LC-RS provider. Tests and deployment documentation cover configuration, environment fallback, precedence, and validation. Vault TLS configuration
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The PR adds configurable Vault trust roots and unifies the TLS crypto provider; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant VaultConfig
participant VaultSetup
participant VaultKeySource
participant build_client
participant Rustls
VaultConfig->>VaultSetup: resolve CA files and directories
VaultSetup-->>VaultKeySource: return parsed ca_roots()
VaultKeySource->>build_client: pass parsed certificates
build_client->>Rustls: install aws-lc-rs provider once
build_client-->>VaultKeySource: return configured HTTP client
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 97.87% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 47 functions across 11 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@crates/vault/src/config.rs`:
- Line 558: Update the CA-directory entry filtering in resolve_with to call
std::fs::metadata on each path, propagate metadata failures through
Error::CaRoots while preserving the child path, and only process regular files.
Add a regression test covering an entry whose metadata cannot be read.
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⛔ Files ignored due to path filters (7)
.backlog/tasks/task-0738 - clippy.toml-sets-no-msrv-so-clippy-suggestions-are-not-checked-against-rust-version-1.85.mdis excluded by!.backlog/**.backlog/tasks/task-0739 - Unify-the-rustls-crypto-provider-now-that-reqwest-is-a-direct-dependency.mdis excluded by!.backlog/**.backlog/tasks/task-0740 - Promote-VAULT_CACERT-VAULT_CAPATH-to-vault-config-fields.mdis excluded by!.backlog/**.backlog/tasks/task-0741 - The-Vault-response-buffer-holds-DEK-plaintext-this-crate-cannot-wipe.mdis excluded by!.backlog/**.forge-sync/waivers/clippy.toml.patchis excluded by!.forge-sync/**Cargo.lockis excluded by!**/*.lock,!Cargo.lockfuzz/Cargo.lockis excluded by!**/*.lock,!fuzz/Cargo.lock
📒 Files selected for processing (15)
Cargo.tomlclippy.tomlcrates/proxy/src/session.rscrates/proxy/src/tls.rscrates/proxy/tests/common/mod.rscrates/vault/Cargo.tomlcrates/vault/src/config.rscrates/vault/src/error.rscrates/vault/src/source/fake_vault.rscrates/vault/src/source/http/client.rscrates/vault/src/source/http/mod.rscrates/vault/src/source/http/tls_tests.rscrates/vault/src/source/key_source.rscrates/vault/src/source/store.rsdocs/deploying.md
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`Path::is_file` coerces a failed `stat` to `false`, so it cannot tell "this is not a file" apart from "I could not look". A dangling symlink in a `ca_path`, one pointing into a directory this process cannot search, or an entry removed between the `read_dir` and the check was therefore passed over in silence — and with any other entry in the directory supplying a certificate, the section resolved *successfully* one trust root short. The `CaRootsEmpty` backstop does not catch it, because the directory is not empty. That is the silent fallback the rest of this function exists to refuse: the operator gets a subset of the roots they named and an unexplained handshake failure later, with nothing pointing at the cause. `std::fs::metadata` now decides, and its failure is an `Error::CaRoots` naming the entry rather than the directory. So a dangling symlink fails startup, which is the intended trade and the same rule the module already follows — something that could have been a trust root and is not usable is refused, and only something that plainly is not one, a subdirectory, is passed over. Found by CodeRabbit on #53. The regression test builds a directory holding one valid CA and one dangling symlink, and was checked against the unfixed code: it resolved with a single root instead of refusing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Four backlog items on the
[vault]hop, landing together because three of themtouch the same files. Two are code, two are decisions that had to be checked
before they could be recorded.
TASK-0740 —
[vault] ca_cert/ca_pathconfig fields. Custom trustroots were reachable only through
VAULT_CACERT/VAULT_CAPATH. They areconfig fields now, with the environment as fallback; the config field wins and
the override is logged at WARN naming the file in force. The files are read
and parsed by
VaultConfig::resolve, which carries the certificates onVaultSetuprather than the paths — so a setup that exists is one whose trustroots were readable, and the connect path can neither fail on a typo nor read
a different file than the one that was checked (CL-3).
Error::CaRootsandError::CaRootsEmptyname which of the two spellings was in force.TASK-0739 — one rustls crypto provider.
reqwestmoves torustls-tls-webpki-roots-no-provideranddbsec-vaulttakes a directrustlsdependency, soaws-lc-rsis the only provider in the graph and allthree TLS hops negotiate under one policy instead of under whichever crate
installed first. The recorded blocker —
Client::build()panicking under thatfeature with no process-level provider — is closed twice over: naming
rustlsmakes the provider count exactly one, and
install_providerinstalls it firstanyway for a consumer who enables a second.
install_crypto_providerkeepsthe half that was never about the ambiguity, and says so. Eight packages leave
the lockfile, all of it reqwest's HTTP/3 path;
ringstays viatokio-postgres-rustls, sodeny.toml's clarify block is untouched.TASK-0741 — the response-buffer DEK copy, accepted. Streaming into a
Zeroizingbuffer does not close it: everychunk()is a slice of the sameconnection-owned buffer, so the rewrite would move the copy and add one of its
own. What is left is one allocator free long, in freed heap, covered by the
core-dump and swap measures already in place. Recorded with its reasoning
rather than left as an open comment.
TASK-0738 — no clippy
msrv, and why. The premise did not hold: clippytakes the MSRV from
[package] rust-versionwhenclippy.tomlnames none, sothe MSRV-gated lints were already checked per crate (verified against clippy
0.1.98). A key here would override that, and this workspace has three
answers to override it with — 1.85 inherited, 1.86 for
dbsec-vault, none forthe binary that tracks stable.
clippy.tomlis forge-synced, so the note is arecorded waiver kept to a delimited block after the canonical text.
Verification.
make check17/17 ·make e2e-vault2/2 against a livedev-mode OpenBao · 716 unit tests · doctests ·
make deny(both workspaces) ·both MSRV jobs (
+1.85libraries,+1.86vault) · the full--run-ignored ignored-onlysuite 14/14 with Postgres and OpenBao up ·CodeRabbit 0 findings.
🤖 Generated with Claude Code
Summary by CodeRabbit
ca_certandca_path.VAULT_CACERTandVAULT_CAPATH.