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CHORUS/go.mod
anthonyrawlins 9190c75440 Implement Beat 3: Policy Gate (JWT Authentication) 
This commit completes Beat 3 of the SequentialThinkingForCHORUS implementation,
adding KACHING JWT policy enforcement with scope checking.

## Deliverables

### 1. JWT Validation Package (pkg/seqthink/policy/)

**jwt.go** (313 lines): Complete JWT validation system
- `Validator`: JWT token validation with JWKS fetching
- `Claims`: JWT claims structure with scope support
- JWKS fetching and caching (1-hour TTL)
- RSA public key parsing from JWK format
- Space-separated and array scope formats
- Automatic JWKS refresh on cache expiration

**Features**:
- RS256 signature verification
- Expiration and NotBefore validation
- Required scope checking
- JWKS caching to reduce API calls
- Thread-safe key cache with mutex
- Base64 URL encoding/decoding utilities

**jwt_test.go** (296 lines): Comprehensive test suite
- Valid token validation
- Expired token rejection
- Missing scope detection
- Space-separated scopes parsing
- Not-yet-valid token rejection
- JWKS caching behavior verification
- Invalid JWKS server handling
- 5 test scenarios, all passing

### 2. Authorization Middleware

**middleware.go** (75 lines): HTTP authorization middleware
- Bearer token extraction from Authorization header
- Token validation via Validator
- Policy denial metrics tracking
- Optional enforcement (disabled if no JWKS URL)
- Request logging with subject and scopes
- Clean error responses (401 Unauthorized)

**Integration**:
- Wraps `/mcp/tool` endpoint (both encrypted and plaintext)
- Wraps `/mcp/sse` endpoint (both encrypted and plaintext)
- Health and metrics endpoints remain open (no auth)
- Automatic mode detection based on configuration

### 3. Proxy Server Integration

**Updated server.go**:
- Policy middleware initialization in `NewServer()`
- Pre-fetches JWKS on startup
- Auth wrapper for protected endpoints
- Configuration-based enforcement
- Graceful fallback if JWKS unavailable

**Configuration**:
```go
ServerConfig{
    KachingJWKSURL: "https://auth.kaching.services/jwks",
    RequiredScope:  "sequentialthinking.run",
}
```

If both fields are set → policy enforcement enabled
If either is empty → policy enforcement disabled (dev mode)

## Testing Results

### Unit Tests
```
PASS: TestValidateToken (5 scenarios)
  - valid_token with required scope
  - expired_token rejection
  - missing_scope rejection
  - space_separated_scopes parsing
  - not_yet_valid rejection

PASS: TestJWKSCaching
  - Verifies JWKS fetched only once within cache window
  - Verifies JWKS re-fetched after cache expiration

PASS: TestParseScopes (5 scenarios)
  - Single scope parsing
  - Multiple scopes parsing
  - Extra spaces handling
  - Empty string handling
  - Spaces-only handling

PASS: TestInvalidJWKS
  - Handles JWKS server errors gracefully

PASS: TestGetCachedKeyCount
  - Tracks cached key count correctly
```

**All 5 test groups passed (16 total test cases)**

### Integration Verification

**Without Policy** (development):
```bash
export KACHING_JWKS_URL=""
./build/seqthink-wrapper
# → "Policy enforcement disabled"
# → All requests allowed
```

**With Policy** (production):
```bash
export KACHING_JWKS_URL="https://auth.kaching.services/jwks"
export REQUIRED_SCOPE="sequentialthinking.run"
./build/seqthink-wrapper
# → "Policy enforcement enabled"
# → JWKS pre-fetched
# → Authorization: Bearer <token> required
```

## Security Properties

✅ **Authentication**: RS256 JWT signature verification
✅ **Authorization**: Scope-based access control
✅ **Token Validation**: Expiration and not-before checking
✅ **JWKS Security**: Automatic key rotation support
✅ **Metrics**: Policy denial tracking for monitoring
✅ **Graceful Degradation**: Works without JWKS in dev mode
✅ **Thread Safety**: Concurrent JWKS cache access safe

## API Flow with Policy

### Successful Request:
```
1. Client → POST /mcp/tool
   Authorization: Bearer eyJhbGci...
   Content-Type: application/age
   Body: <encrypted request>

2. Middleware extracts Bearer token
3. Middleware validates JWT signature (JWKS)
4. Middleware checks required scope
5. Request forwarded to handler
6. Handler decrypts request
7. Handler calls MCP server
8. Handler encrypts response
9. Response sent to client
```

### Unauthorized Request:
```
1. Client → POST /mcp/tool
   (missing Authorization header)

2. Middleware checks for header → NOT FOUND
3. Policy denial metric incremented
4. 401 Unauthorized response
5. Request rejected
```

## Configuration Modes

**Full Security** (Beat 2 + Beat 3):
```bash
export AGE_IDENT_PATH=/etc/seqthink/age.key
export AGE_RECIPS_PATH=/etc/seqthink/age.pub
export KACHING_JWKS_URL=https://auth.kaching.services/jwks
export REQUIRED_SCOPE=sequentialthinking.run
```
→ Encryption + Authentication + Authorization

**Development Mode**:
```bash
# No AGE_* or KACHING_* variables set
```
→ Plaintext, no authentication

## Next Steps (Beat 4)

Beat 4 will add deployment infrastructure:
- Docker Swarm service definition
- Network overlay configuration
- Secret management for age keys
- KACHING integration documentation
- End-to-end testing in swarm

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-10-13 08:48:42 +11:00

179 lines
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Modula-2
Raw Blame History

module chorus
go 1.23.0
toolchain go1.24.5
require (
filippo.io/age v1.2.1
github.com/blevesearch/bleve/v2 v2.5.3
github.com/chorus-services/backbeat v0.0.0-00010101000000-000000000000
github.com/docker/docker v28.4.0+incompatible
github.com/docker/go-connections v0.6.0
github.com/docker/go-units v0.5.0
github.com/go-redis/redis/v8 v8.11.5
github.com/golang-jwt/jwt/v5 v5.3.0
github.com/google/uuid v1.6.0
github.com/gorilla/mux v1.8.1
github.com/gorilla/websocket v1.5.0
github.com/ipfs/go-cid v0.4.1
github.com/libp2p/go-libp2p v0.32.0
github.com/libp2p/go-libp2p-kad-dht v0.25.2
github.com/libp2p/go-libp2p-pubsub v0.10.0
github.com/multiformats/go-multiaddr v0.12.0
github.com/multiformats/go-multihash v0.2.3
github.com/prometheus/client_golang v1.19.1
github.com/robfig/cron/v3 v3.0.1
github.com/rs/zerolog v1.32.0
github.com/sashabaranov/go-openai v1.41.1
github.com/sony/gobreaker v0.5.0
github.com/stretchr/testify v1.11.1
github.com/syndtr/goleveldb v1.0.0
golang.org/x/crypto v0.24.0
gopkg.in/yaml.v3 v3.0.1
)
require (
github.com/Microsoft/go-winio v0.6.2 // indirect
github.com/RoaringBitmap/roaring/v2 v2.4.5 // indirect
github.com/benbjohnson/clock v1.3.5 // indirect
github.com/beorn7/perks v1.0.1 // indirect
github.com/bits-and-blooms/bitset v1.22.0 // indirect
github.com/blevesearch/bleve_index_api v1.2.8 // indirect
github.com/blevesearch/geo v0.2.4 // indirect
github.com/blevesearch/go-faiss v1.0.25 // indirect
github.com/blevesearch/go-porterstemmer v1.0.3 // indirect
github.com/blevesearch/gtreap v0.1.1 // indirect
github.com/blevesearch/mmap-go v1.0.4 // indirect
github.com/blevesearch/scorch_segment_api/v2 v2.3.10 // indirect
github.com/blevesearch/segment v0.9.1 // indirect
github.com/blevesearch/snowballstem v0.9.0 // indirect
github.com/blevesearch/upsidedown_store_api v1.0.2 // indirect
github.com/blevesearch/vellum v1.1.0 // indirect
github.com/blevesearch/zapx/v11 v11.4.2 // indirect
github.com/blevesearch/zapx/v12 v12.4.2 // indirect
github.com/blevesearch/zapx/v13 v13.4.2 // indirect
github.com/blevesearch/zapx/v14 v14.4.2 // indirect
github.com/blevesearch/zapx/v15 v15.4.2 // indirect
github.com/blevesearch/zapx/v16 v16.2.4 // indirect
github.com/cespare/xxhash/v2 v2.2.0 // indirect
github.com/containerd/cgroups v1.1.0 // indirect
github.com/containerd/errdefs v1.0.0 // indirect
github.com/containerd/errdefs/pkg v0.3.0 // indirect
github.com/coreos/go-systemd/v22 v22.5.0 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/davidlazar/go-crypto v0.0.0-20200604182044-b73af7476f6c // indirect
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
github.com/distribution/reference v0.6.0 // indirect
github.com/elastic/gosigar v0.14.2 // indirect
github.com/felixge/httpsnoop v1.0.4 // indirect
github.com/flynn/noise v1.0.0 // indirect
github.com/francoispqt/gojay v1.2.13 // indirect
github.com/go-logr/logr v1.4.3 // indirect
github.com/go-logr/stdr v1.2.2 // indirect
github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
github.com/godbus/dbus/v5 v5.1.0 // indirect
github.com/gogo/protobuf v1.3.2 // indirect
github.com/golang/protobuf v1.5.3 // indirect
github.com/golang/snappy v0.0.4 // indirect
github.com/google/gopacket v1.1.19 // indirect
github.com/google/pprof v0.0.0-20231023181126-ff6d637d2a7b // indirect
github.com/hashicorp/errwrap v1.1.0 // indirect
github.com/hashicorp/go-multierror v1.1.1 // indirect
github.com/hashicorp/golang-lru v0.5.4 // indirect
github.com/hashicorp/golang-lru/v2 v2.0.5 // indirect
github.com/huin/goupnp v1.3.0 // indirect
github.com/ipfs/boxo v0.10.0 // indirect
github.com/ipfs/go-datastore v0.6.0 // indirect
github.com/ipfs/go-log v1.0.5 // indirect
github.com/ipfs/go-log/v2 v2.5.1 // indirect
github.com/ipld/go-ipld-prime v0.20.0 // indirect
github.com/jackpal/go-nat-pmp v1.0.2 // indirect
github.com/jbenet/go-temp-err-catcher v0.1.0 // indirect
github.com/jbenet/goprocess v0.1.4 // indirect
github.com/json-iterator/go v1.1.12 // indirect
github.com/klauspost/compress v1.17.2 // indirect
github.com/klauspost/cpuid/v2 v2.2.5 // indirect
github.com/koron/go-ssdp v0.0.4 // indirect
github.com/libp2p/go-buffer-pool v0.1.0 // indirect
github.com/libp2p/go-cidranger v1.1.0 // indirect
github.com/libp2p/go-flow-metrics v0.1.0 // indirect
github.com/libp2p/go-libp2p-asn-util v0.3.0 // indirect
github.com/libp2p/go-libp2p-kbucket v0.6.3 // indirect
github.com/libp2p/go-libp2p-record v0.2.0 // indirect
github.com/libp2p/go-libp2p-routing-helpers v0.7.2 // indirect
github.com/libp2p/go-msgio v0.3.0 // indirect
github.com/libp2p/go-nat v0.2.0 // indirect
github.com/libp2p/go-netroute v0.2.1 // indirect
github.com/libp2p/go-reuseport v0.4.0 // indirect
github.com/libp2p/go-yamux/v4 v4.0.1 // indirect
github.com/libp2p/zeroconf/v2 v2.2.0 // indirect
github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd // indirect
github.com/mattn/go-colorable v0.1.13 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
github.com/miekg/dns v1.1.56 // indirect
github.com/mikioh/tcpinfo v0.0.0-20190314235526-30a79bb1804b // indirect
github.com/mikioh/tcpopt v0.0.0-20190314235656-172688c1accc // indirect
github.com/minio/sha256-simd v1.0.1 // indirect
github.com/moby/docker-image-spec v1.3.1 // indirect
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
github.com/modern-go/reflect2 v1.0.2 // indirect
github.com/mr-tron/base58 v1.2.0 // indirect
github.com/mschoch/smat v0.2.0 // indirect
github.com/multiformats/go-base32 v0.1.0 // indirect
github.com/multiformats/go-base36 v0.2.0 // indirect
github.com/multiformats/go-multiaddr-dns v0.3.1 // indirect
github.com/multiformats/go-multiaddr-fmt v0.1.0 // indirect
github.com/multiformats/go-multibase v0.2.0 // indirect
github.com/multiformats/go-multicodec v0.9.0 // indirect
github.com/multiformats/go-multistream v0.5.0 // indirect
github.com/multiformats/go-varint v0.0.7 // indirect
github.com/nats-io/nats.go v1.36.0 // indirect
github.com/nats-io/nkeys v0.4.7 // indirect
github.com/nats-io/nuid v1.0.1 // indirect
github.com/onsi/ginkgo/v2 v2.13.0 // indirect
github.com/opencontainers/go-digest v1.0.0 // indirect
github.com/opencontainers/image-spec v1.1.1 // indirect
github.com/opencontainers/runtime-spec v1.1.0 // indirect
github.com/opentracing/opentracing-go v1.2.0 // indirect
github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
github.com/pkg/errors v0.9.1 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/polydawn/refmt v0.89.0 // indirect
github.com/prometheus/client_model v0.5.0 // indirect
github.com/prometheus/common v0.48.0 // indirect
github.com/prometheus/procfs v0.12.0 // indirect
github.com/quic-go/qpack v0.4.0 // indirect
github.com/quic-go/qtls-go1-20 v0.3.4 // indirect
github.com/quic-go/quic-go v0.39.3 // indirect
github.com/quic-go/webtransport-go v0.6.0 // indirect
github.com/raulk/go-watchdog v1.3.0 // indirect
github.com/spaolacci/murmur3 v1.1.0 // indirect
github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1 // indirect
go.etcd.io/bbolt v1.4.0 // indirect
go.opencensus.io v0.24.0 // indirect
go.opentelemetry.io/auto/sdk v1.1.0 // indirect
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0 // indirect
go.opentelemetry.io/otel v1.38.0 // indirect
go.opentelemetry.io/otel/metric v1.38.0 // indirect
go.opentelemetry.io/otel/trace v1.38.0 // indirect
go.uber.org/dig v1.17.1 // indirect
go.uber.org/fx v1.20.1 // indirect
go.uber.org/mock v0.3.0 // indirect
go.uber.org/multierr v1.11.0 // indirect
go.uber.org/zap v1.26.0 // indirect
golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
golang.org/x/mod v0.18.0 // indirect
golang.org/x/net v0.26.0 // indirect
golang.org/x/sync v0.10.0 // indirect
golang.org/x/sys v0.35.0 // indirect
golang.org/x/text v0.16.0 // indirect
golang.org/x/tools v0.22.0 // indirect
gonum.org/v1/gonum v0.13.0 // indirect
google.golang.org/protobuf v1.34.2 // indirect
lukechampine.com/blake3 v1.2.1 // indirect
)
replace github.com/chorus-services/backbeat => ../BACKBEAT/backbeat/prototype
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