feat(teams): CredentialStore interface + AES-256-GCM BBolt backend (074-T1)#587
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Foundation for upstream token brokering (spec 074, MCP-1034). New server-edition package internal/teams/broker provides: - CredentialStore interface (Get/Put/Delete/List) as the abstraction seam for future external secret-manager backends (FR-023). - BBoltAESStore: bucket "user_upstream_credentials", keyed "<userID>:<serverKey>" for upstream creds and bare "<userID>" for idp subject tokens. serverKey follows the existing SHA256(name+url) scheme. - UpstreamCredential value model, JSON-serialized then AES-256-GCM encrypted with a per-record random nonce (FR-020) and isolated per user (FR-021). - Master key resolved from MCPPROXY_CRED_KEY env or teams.credential_encryption_key (32-byte base64). Missing key -> store disabled gracefully; present-but-invalid -> loud error (FR-022). - Decryption failure (e.g. rotated key) treated as record-absent, never fatal; List skips undecryptable records. Adds teams.credential_encryption_key config field as the config-side key source. TDD: roundtrip, per-user isolation, nonce uniqueness, expiry helpers, missing-key disabled path, key-changed -> not-found. Related spec: specs/074-upstream-token-brokering
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Dumbris
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…(spec 074, MCP-1035) (#588) * feat(config): per-upstream auth_broker block + teams credential keys (spec 074) Add server-edition configuration surface for per-user upstream token brokering (spec 074, T2 / MCP-1035): - ServerConfig.AuthBroker *AuthBrokerConfig with mode (token_exchange|entra_obo|oauth_connect), token_endpoint, resource (RFC 8707 audience), scopes, client_id/secret, and configurable header + header_format (defaults "Authorization" / "Bearer {token}", FR-016). - TeamsConfig.CredentialEncryptionKey (env fallback MCPPROXY_CRED_KEY, explicit config wins) and StoreIDPTokens bool, default false (FR-006). - Validation rejects auth_broker on stdio/non-HTTP-family upstreams with an "unsupported in this phase" message (FR-002); HTTP-family upstreams pass and have header defaults applied. Opt-in per server; upstreams without a broker behave exactly as today (FR-003). The AuthBrokerConfig type and validation are behind //go:build server with a personal-edition stub (empty struct + no-op validator), so the personal edition is unaffected. AuthBroker carries swaggerignore (mirrors Teams) — swagger-verify confirms no OpenAPI drift. Related #587 * test(storage): cover ServerConfig.AuthBroker in saveServerSync field canary AuthBroker (spec 074) is server-edition per-upstream broker config carried in the JSON config (like Shared), not persisted to the BBolt UpstreamRecord. Mark it intentionally excluded in TestSaveServerSyncFieldCoverage so the field-coverage canary passes. Related #588
This was referenced Jun 4, 2026
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Summary
Foundation task MCP-1034 / 074-T1 for upstream token brokering (spec 074). No blockers. New server-edition package
internal/teams/broker/(//go:build server).CredentialStoreinterface (Get/Put/Delete/List) — the abstraction seam so external secret managers (Vault/AWS) can be added later without changing callers (FR-023).BBoltAESStorebackend — bucketuser_upstream_credentials:<userID>:<serverKey>(serverKey = existingSHA256(name+url)scheme, seeoauth.GenerateServerKey)<userID>(emptyserverKeyselects them)UpstreamCredentialvalue model (Type, AccessToken, RefreshToken, ExpiresAt, Scopes, TokenType, Audience, ObtainedVia, UpdatedAt), JSON-serialized then AES-256-GCM encrypted with a per-record random nonce (FR-020), isolated per user (FR-021).MCPPROXY_CRED_KEYorteams.credential_encryption_key(32-byte base64). Missing key → store disabled gracefully (rest of gateway unaffected, logged for startup surfacing); present-but-invalid → loud error (FR-022).Listskips undecryptable records.teams.credential_encryption_keyconfig field as the config-side key source.Mirrors the obot-platform/mcp-oauth-proxy AES approach.
Tests (TDD — test-first, all green with
-race)ListexclusionIsExpired/IsValid/ExpiresWithin, zero = never)ErrStoreDisabled)ErrNotFound(not-connected)ResolveMasterKeyenv-over-config precedenceVerification
Notes
docs/file documents teams config keys (they live in CLAUDE.md, which is at the 40k CI size limit); the field is an inert foundation seam not yet wired/activated, so user-facing docs are deferred to the downstream startup-wiring task. Spec FRs already documented inspecs/074-upstream-token-brokering/spec.md.Related spec:
specs/074-upstream-token-brokering· FR-020..FR-023