OpenBao Rust Crate 0.6.0

OpenBao Rust SDK 0.6.0 Release Notes

Version

• Version: 0.6.0
• Release date: 2026-05-31
• Git tag: v0.6.0
• Git commit: tag target for v0.6.0
• License: MIT OR Apache-2.0

Scope

• Stable modules carried from 0.5.0: client configuration, direct token auth,
  AppRole login, token lifecycle helpers, KV v1/v2, Transit, sys health/seal
  status, loopback-only dev bootstrap, mount/auth mount management, response
  wrapping, ACL policies, capabilities, audit devices, exact lease helpers,
  plugin catalog helpers, environment-based client construction, Kubernetes
  auth, TLS certificate auth, PKI helpers, Userpass auth, JWT/OIDC helpers,
  database secrets helpers, SSH helpers, TOTP helpers, and optional Transit
  byte helpers.
• New 0.6.0 work: bounded ACL policy builder helpers
  for common KV v2 and Transit least-privilege rules; TOTP key
  create/read/list/delete, code generation, and code validation; SSH roles,
  zero-address roles, IP role lookup, OTP credentials, default issuer config,
  issuer list/submit/read/update/delete, authenticated CA public-key metadata,
  CA signing, generated certificate/key issuance, and OTP verification;
  idempotent admin bootstrap builder for KV v2 mounts, Transit mounts, Transit
  keys, ACL policies, KV v2 string secret values, and explicit scoped
  service-token issuance; explicitly gated production init, unseal, seal,
  legacy rekey, key-share rotation, and keyring rotation APIs.
• Remaining 0.6.0 planned work: none. AppRole administration and auth-method
  bootstrap orchestration moved into the 0.7.0 release plan.
• Default Cargo features: approle, cert-auth, database, jwt-auth,
  kubernetes-auth, userpass, token, kv1, kv2, pki, ssh, totp,
  transit, sys, rustls-tls.
• Non-default Cargo features: allow-sha1, native-tls,
  native-tls-acknowledged, operator-ops, operator-ops-acknowledged,
  transit-bytes.
• Minimum supported Rust: 1.90.0.
• Rust compatibility evidence: release gate covers full test suite and clippy
  on the configured toolchain plus feature checks through the latest stable
  Rust in CI.

Security Changes

• ACL policy builder support starts with a narrow typed subset: known
  capabilities only, no mixed deny rules, bounded rule count, bounded output
  size, validated paths, and escaped HCL path strings.
• Helper-generated KV v2 and Transit ACL paths require literal mount, prefix,
  and key inputs; callers can still use explicit raw policy paths when they
  intentionally need OpenBao wildcards.
• TOTP generated codes, OTP URLs, QR barcodes, imported OTP URLs, and imported
  root keys are represented with SecretString and redacted from debug output.
• SSH OTP credentials, OTP verification requests, generated private keys, and
  submitted CA private keys are represented with SecretString and redacted
  from debug output.
• SSH role listing accepts OpenBao's documented keys response field, while
  preserving support for the roles shape used by lookup-style endpoints.
• SSH role, sign, and issue requests now validate duration strings, reject
  control characters in principal/CIDR fields, reject unsupported SSH public-key
  prefixes, and reject weak generated RSA key sizes before request dispatch.
• Admin bootstrap reports redact issued token material and bootstrap operation
  debug output avoids exposing KV v2 string secret values.
• Admin bootstrap compares existing and desired KV v2 secret values with
  constant-time equality, bounds plans to 512 operations, and treats duplicate
  mount/Transit-key creation races as unchanged state.
• Production operator APIs are unavailable in default builds and require both
  operator-ops and operator-ops-acknowledged; responses containing root,
  unseal, recovery, or rekey material redact that material from debug output.
• Client::with_token is deprecated in favor of Client::try_with_token so
  invalid token header values can fail at client construction.
• Token create TTL, explicit-max-TTL, and period fields are validated before
  token creation requests are sent.
• Token renewal increments are validated before request dispatch.
• Token creation has policy/default-policy builder helpers, KV v2 service
  configs can require keys by name, KV v2 list supports pagination, common API
  status checks have Error inspectors, and mount/auth enable requests have
  lease-TTL builders.
• Dev-state TLS private-key patterns are explicitly ignored. The current
  working tree has no tracked deploy/podman/dev-state key material.

Security And Stability Gate

• Gate command: scripts/release_0_6_gate.sh
• Result: final local release gate passed on 2026-05-31.
• Pentest report: local PENTEST.md reviewed on 2026-05-31; actionable local
  findings fixed and the report was deleted before commit.
• Gap analysis: local GAP_ANALYSIS.md reviewed on 2026-05-31; smaller API and
  documentation gaps fixed, and AppRole admin plus auth-method bootstrap work
  moved into the 0.7.0 release plan. The local report was deleted before
  commit.
• cargo audit result: passed on 2026-05-31.
• cargo deny check result: passed on 2026-05-31 with duplicate dependency
  warnings only.
• CodeQL result: passed in GitHub on 2026-05-31.
• Podman OpenBao integration result: passed on 2026-05-31 against OpenBao
  v2.5.4 on the local 9940 dev endpoint.
• SBOM generation result: passed on 2026-05-31; SBOM written to
  target/sbom/openbao.cdx.json.
• Reproducible package result: passed on 2026-05-31 with
  cargo package --locked --allow-dirty; package verification is now part of
  the release gate.

Known Limitations

• Raw unauthenticated SSH public-key reads are intentionally not implemented;
  callers that need raw text/plain public-key endpoints should use an external
  HTTP client and treat the result as public key material.
• The ACL policy builder intentionally does not cover advanced ACL fields such
  as required parameters, allowed parameters, denied parameters, or wrapping
  TTL constraints. Use sys::PolicyWriteRequest directly for advanced policy
  documents.