ryyst/kalzu-value-store
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feat: implement secure cluster authentication (issue #13)

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Implemented a comprehensive secure authentication mechanism for inter-node
cluster communication with the following features:

1. Global Cluster Secret (GCS)
   - Auto-generated cryptographically secure random secret (256-bit)
   - Configurable via YAML config file
   - Shared across all cluster nodes for authentication

2. Cluster Authentication Middleware
   - Validates X-Cluster-Secret and X-Node-ID headers
   - Applied to all cluster endpoints (/members/*, /merkle_tree/*, /kv_range)
   - Comprehensive logging of authentication attempts

3. Authenticated HTTP Client
   - Custom HTTP client with cluster auth headers
   - TLS support with configurable certificate verification
   - Protocol-aware (http/https based on TLS settings)

4. Secure Bootstrap Endpoint
   - New /auth/cluster-bootstrap endpoint
   - Protected by JWT authentication with admin scope
   - Allows new nodes to securely obtain cluster secret

5. Updated Cluster Communication
   - All gossip protocol requests include auth headers
   - All Merkle tree sync requests include auth headers
   - All data replication requests include auth headers

6. Configuration
   - cluster_secret: Shared secret (auto-generated if not provided)
   - cluster_tls_enabled: Enable TLS for inter-node communication
   - cluster_tls_cert_file: Path to TLS certificate
   - cluster_tls_key_file: Path to TLS private key
   - cluster_tls_skip_verify: Skip TLS verification (testing only)

This implementation addresses the security vulnerability of unprotected
cluster endpoints and provides a flexible, secure approach to protecting
internal cluster communication while allowing for automated node bootstrapping.

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

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
ryyst
2025-10-02 22:19:40 +03:00
parent 2431d3cfb0
commit c7dcebb894
28 changed files with 477 additions and 230 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
server/routes.go
View File

@@ -1,6 +1,8 @@
package server
import (
"net/http"
"github.com/gorilla/mux"
)
@@ -20,7 +22,7 @@ func (s *Server) setupRoutes() *mux.Router {
} else {
router.HandleFunc("/kv/{path:.+}", s.getKVHandler).Methods("GET")
}
// PUT endpoint - require auth if anonymous write is disabled
if s.config.AuthEnabled && !s.config.AllowAnonymousWrite {
router.Handle("/kv/{path:.+}", s.authService.Middleware(
@@ -29,7 +31,7 @@ func (s *Server) setupRoutes() *mux.Router {
} else {
router.HandleFunc("/kv/{path:.+}", s.putKVHandler).Methods("PUT")
}
// DELETE endpoint - always require authentication (no anonymous delete)
if s.config.AuthEnabled {
router.Handle("/kv/{path:.+}", s.authService.Middleware(
@@ -41,16 +43,31 @@ func (s *Server) setupRoutes() *mux.Router {
// Member endpoints (available when clustering is enabled)
if s.config.ClusteringEnabled {
router.HandleFunc("/members/", s.getMembersHandler).Methods("GET")
router.HandleFunc("/members/join", s.joinMemberHandler).Methods("POST")
router.HandleFunc("/members/leave", s.leaveMemberHandler).Methods("DELETE")
router.HandleFunc("/members/gossip", s.gossipHandler).Methods("POST")
router.HandleFunc("/members/pairs_by_time", s.pairsByTimeHandler).Methods("POST")
// Apply cluster authentication middleware if cluster secret is configured
if s.clusterAuthService != nil {
router.Handle("/members/", s.clusterAuthService.Middleware(http.HandlerFunc(s.getMembersHandler))).Methods("GET")
router.Handle("/members/join", s.clusterAuthService.Middleware(http.HandlerFunc(s.joinMemberHandler))).Methods("POST")
router.Handle("/members/leave", s.clusterAuthService.Middleware(http.HandlerFunc(s.leaveMemberHandler))).Methods("DELETE")
router.Handle("/members/gossip", s.clusterAuthService.Middleware(http.HandlerFunc(s.gossipHandler))).Methods("POST")
router.Handle("/members/pairs_by_time", s.clusterAuthService.Middleware(http.HandlerFunc(s.pairsByTimeHandler))).Methods("POST")
// Merkle Tree endpoints (clustering feature)
router.HandleFunc("/merkle_tree/root", s.getMerkleRootHandler).Methods("GET")
router.HandleFunc("/merkle_tree/diff", s.getMerkleDiffHandler).Methods("POST")
router.HandleFunc("/kv_range", s.getKVRangeHandler).Methods("POST")
// Merkle Tree endpoints (clustering feature)
router.Handle("/merkle_tree/root", s.clusterAuthService.Middleware(http.HandlerFunc(s.getMerkleRootHandler))).Methods("GET")
router.Handle("/merkle_tree/diff", s.clusterAuthService.Middleware(http.HandlerFunc(s.getMerkleDiffHandler))).Methods("POST")
router.Handle("/kv_range", s.clusterAuthService.Middleware(http.HandlerFunc(s.getKVRangeHandler))).Methods("POST")
} else {
// Fallback to unprotected endpoints (for backwards compatibility)
router.HandleFunc("/members/", s.getMembersHandler).Methods("GET")
router.HandleFunc("/members/join", s.joinMemberHandler).Methods("POST")
router.HandleFunc("/members/leave", s.leaveMemberHandler).Methods("DELETE")
router.HandleFunc("/members/gossip", s.gossipHandler).Methods("POST")
router.HandleFunc("/members/pairs_by_time", s.pairsByTimeHandler).Methods("POST")
// Merkle Tree endpoints (clustering feature)
router.HandleFunc("/merkle_tree/root", s.getMerkleRootHandler).Methods("GET")
router.HandleFunc("/merkle_tree/diff", s.getMerkleDiffHandler).Methods("POST")
router.HandleFunc("/kv_range", s.getKVRangeHandler).Methods("POST")
}
}
// Authentication and user management endpoints (available when auth is enabled)
@@ -59,15 +76,15 @@ func (s *Server) setupRoutes() *mux.Router {
router.Handle("/api/users", s.authService.Middleware(
[]string{"admin:users:create"}, nil, "",
)(s.createUserHandler)).Methods("POST")
router.Handle("/api/users/{uuid}", s.authService.Middleware(
[]string{"admin:users:read"}, nil, "",
)(s.getUserHandler)).Methods("GET")
router.Handle("/api/users/{uuid}", s.authService.Middleware(
[]string{"admin:users:update"}, nil, "",
)(s.updateUserHandler)).Methods("PUT")
router.Handle("/api/users/{uuid}", s.authService.Middleware(
[]string{"admin:users:delete"}, nil, "",
)(s.deleteUserHandler)).Methods("DELETE")
@@ -76,15 +93,15 @@ func (s *Server) setupRoutes() *mux.Router {
router.Handle("/api/groups", s.authService.Middleware(
[]string{"admin:groups:create"}, nil, "",
)(s.createGroupHandler)).Methods("POST")
router.Handle("/api/groups/{uuid}", s.authService.Middleware(
[]string{"admin:groups:read"}, nil, "",
)(s.getGroupHandler)).Methods("GET")
router.Handle("/api/groups/{uuid}", s.authService.Middleware(
[]string{"admin:groups:update"}, nil, "",
)(s.updateGroupHandler)).Methods("PUT")
router.Handle("/api/groups/{uuid}", s.authService.Middleware(
[]string{"admin:groups:delete"}, nil, "",
)(s.deleteGroupHandler)).Methods("DELETE")
@@ -93,6 +110,12 @@ func (s *Server) setupRoutes() *mux.Router {
router.Handle("/api/tokens", s.authService.Middleware(
[]string{"admin:tokens:create"}, nil, "",
)(s.createTokenHandler)).Methods("POST")
// Cluster Bootstrap endpoint (Issue #13) - Protected by JWT authentication
// Allows authenticated administrators to retrieve the cluster secret for new nodes
router.Handle("/auth/cluster-bootstrap", s.authService.Middleware(
[]string{"admin:tokens:create"}, nil, "",
)(s.clusterBootstrapHandler)).Methods("GET")
}
// Revision History endpoints (available when revision history is enabled)