Implement WireGuard peer authentication and enhance internal request validation

pkg/auth/internal_auth.go

@@ -0,0 +1,22 @@
+package auth
+
+import "net"
+
+// WireGuardSubnet is the internal WireGuard mesh CIDR.
+const WireGuardSubnet = "10.0.0.0/24"
+
+// IsWireGuardPeer checks whether remoteAddr (host:port format) originates
+// from the WireGuard mesh subnet. This provides cryptographic peer
+// authentication since WireGuard validates keys at the tunnel layer.
+func IsWireGuardPeer(remoteAddr string) bool {
+	host, _, err := net.SplitHostPort(remoteAddr)
+	if err != nil {
+		return false
+	}
+	ip := net.ParseIP(host)
+	if ip == nil {
+		return false
+	}
+	_, wgNet, _ := net.ParseCIDR(WireGuardSubnet)
+	return wgNet.Contains(ip)
+}

pkg/gateway/gateway.go

@@ -18,6 +18,7 @@ import (
 	"sync"
 	"time"
 
+	nodeauth "github.com/DeBrosOfficial/network/pkg/auth"
 	"github.com/DeBrosOfficial/network/pkg/client"
 	"github.com/DeBrosOfficial/network/pkg/deployments"
 	"github.com/DeBrosOfficial/network/pkg/deployments/health"
@@ -806,8 +807,8 @@ func (g *Gateway) namespaceClusterRepairHandler(w http.ResponseWriter, r *http.R
 		return
 	}
 
-	// Internal auth check
-	if r.Header.Get("X-Orama-Internal-Auth") != "namespace-coordination" {
+	// Internal auth check: header + WireGuard subnet verification
+	if r.Header.Get("X-Orama-Internal-Auth") != "namespace-coordination" || !nodeauth.IsWireGuardPeer(r.RemoteAddr) {
 		writeError(w, http.StatusUnauthorized, "unauthorized")
 		return
 	}

pkg/gateway/handlers/deployments/domain_handler.go

@@ -217,14 +217,14 @@ func (h *DomainHandler) HandleVerifyDomain(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	// Update status
+	// Update status (scoped to deployment_id for defense-in-depth)
 	updateQuery := `
 		UPDATE deployment_domains
 		SET verification_status = 'verified', verified_at = ?
-		WHERE domain = ?
+		WHERE domain = ? AND deployment_id = ?
 	`
 
-	_, err = h.service.db.Exec(ctx, updateQuery, time.Now(), domain)
+	_, err = h.service.db.Exec(ctx, updateQuery, time.Now(), domain, domainRecord.DeploymentID)
 	if err != nil {
 		h.logger.Error("Failed to update verification status", zap.Error(err))
 		http.Error(w, "Failed to update verification status", http.StatusInternalServerError)
@@ -358,9 +358,9 @@ func (h *DomainHandler) HandleRemoveDomain(w http.ResponseWriter, r *http.Reques
 	}
 	deploymentID = rows[0].DeploymentID
 
-	// Delete domain
-	deleteQuery := `DELETE FROM deployment_domains WHERE domain = ?`
-	_, err = h.service.db.Exec(ctx, deleteQuery, domain)
+	// Delete domain (scoped to deployment_id for defense-in-depth)
+	deleteQuery := `DELETE FROM deployment_domains WHERE domain = ? AND deployment_id = ?`
+	_, err = h.service.db.Exec(ctx, deleteQuery, domain, deploymentID)
 	if err != nil {
 		h.logger.Error("Failed to delete domain", zap.Error(err))
 		http.Error(w, "Failed to delete domain", http.StatusInternalServerError)

pkg/gateway/handlers/deployments/replica_handler.go

@@ -11,6 +11,7 @@ import (
 
 	"os/exec"
 
+	"github.com/DeBrosOfficial/network/pkg/auth"
 	"github.com/DeBrosOfficial/network/pkg/deployments"
 	"github.com/DeBrosOfficial/network/pkg/deployments/process"
 	"github.com/DeBrosOfficial/network/pkg/ipfs"
@@ -422,6 +423,11 @@ func (h *ReplicaHandler) extractFromIPFS(ctx context.Context, cid, destPath stri
 }
 
 // isInternalRequest checks if the request is an internal node-to-node call.
+// Requires both the static auth header AND that the request originates from
+// the WireGuard mesh subnet (cryptographic peer authentication).
 func (h *ReplicaHandler) isInternalRequest(r *http.Request) bool {
-	return r.Header.Get("X-Orama-Internal-Auth") == "replica-coordination"
+	if r.Header.Get("X-Orama-Internal-Auth") != "replica-coordination" {
+		return false
+	}
+	return auth.IsWireGuardPeer(r.RemoteAddr)
 }

pkg/gateway/handlers/namespace/spawn_handler.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"time"
 
+	"github.com/DeBrosOfficial/network/pkg/auth"
 	"github.com/DeBrosOfficial/network/pkg/gateway"
 	namespacepkg "github.com/DeBrosOfficial/network/pkg/namespace"
 	"github.com/DeBrosOfficial/network/pkg/olric"
@@ -80,8 +81,8 @@ func (h *SpawnHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// Authenticate via internal auth header
-	if r.Header.Get("X-Orama-Internal-Auth") != "namespace-coordination" {
+	// Authenticate via internal auth header + WireGuard subnet check
+	if r.Header.Get("X-Orama-Internal-Auth") != "namespace-coordination" || !auth.IsWireGuardPeer(r.RemoteAddr) {
 		http.Error(w, "unauthorized", http.StatusUnauthorized)
 		return
 	}

pkg/gateway/middleware.go

@@ -940,21 +940,21 @@ func (g *Gateway) handleNamespaceGatewayRequest(w http.ResponseWriter, r *http.R
 		return targets[i].ip < targets[j].ip
 	})
 
-	// Prefer local gateway if this node is part of the namespace cluster.
-	// This avoids a WireGuard network hop and eliminates single-point-of-failure
-	// when a remote gateway node is down.
-	var selected namespaceGatewayTarget
+	// Build ordered target list: local gateway first, then hash-selected, then remaining.
+	// This ordering is used by the circuit breaker fallback loop below.
+	orderedTargets := make([]namespaceGatewayTarget, 0, len(targets))
+	localIdx := -1
 	if g.localWireGuardIP != "" {
-		for _, t := range targets {
+		for i, t := range targets {
 			if t.ip == g.localWireGuardIP {
-				selected = t
+				orderedTargets = append(orderedTargets, t)
+				localIdx = i
 				break
 			}
 		}
 	}
 
-	// Fall back to consistent hashing for nodes not in the namespace cluster
-	if selected.ip == "" {
+	// Consistent hashing for affinity (keeps WS subscribe/publish on same node)
 	affinityKey := namespaceName + "|" + validatedNamespace
 	if apiKey := extractAPIKey(r); apiKey != "" {
 		affinityKey = namespaceName + "|" + apiKey
@@ -965,8 +965,32 @@ func (g *Gateway) handleNamespaceGatewayRequest(w http.ResponseWriter, r *http.R
 	}
 	hasher := fnv.New32a()
 	_, _ = hasher.Write([]byte(affinityKey))
-		targetIdx := int(hasher.Sum32()) % len(targets)
-		selected = targets[targetIdx]
+	hashIdx := int(hasher.Sum32()) % len(targets)
+	if hashIdx != localIdx {
+		orderedTargets = append(orderedTargets, targets[hashIdx])
+	}
+	for i, t := range targets {
+		if i != localIdx && i != hashIdx {
+			orderedTargets = append(orderedTargets, t)
+		}
+	}
+
+	// Select the first target whose circuit breaker allows a request through.
+	// This provides automatic failover when a namespace gateway node is down.
+	var selected namespaceGatewayTarget
+	var cb *CircuitBreaker
+	for _, candidate := range orderedTargets {
+		cbKey := "ns:" + candidate.ip
+		candidateCB := g.circuitBreakers.Get(cbKey)
+		if candidateCB.Allow() {
+			selected = candidate
+			cb = candidateCB
+			break
+		}
+	}
+	if selected.ip == "" {
+		http.Error(w, "Namespace gateway unavailable (all circuits open)", http.StatusServiceUnavailable)
+		return
 	}
 	gatewayIP := selected.ip
 	gatewayPort := selected.port
@@ -1027,14 +1051,6 @@ func (g *Gateway) handleNamespaceGatewayRequest(w http.ResponseWriter, r *http.R
 		proxyReq.Header.Set(HeaderInternalAuthNamespace, validatedNamespace)
 	}
 
-	// Circuit breaker: check if target is healthy before sending request
-	cbKey := "ns:" + gatewayIP
-	cb := g.circuitBreakers.Get(cbKey)
-	if !cb.Allow() {
-		http.Error(w, "Namespace gateway unavailable (circuit open)", http.StatusServiceUnavailable)
-		return
-	}
-
 	// Execute proxy request using shared transport for connection pooling
 	httpClient := &http.Client{Timeout: 30 * time.Second, Transport: g.proxyTransport}
 	resp, err := httpClient.Do(proxyReq)

pkg/gateway/namespace_health.go

@@ -3,9 +3,9 @@ package gateway
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"net"
 	"net/http"
+	"strconv"
 	"sync"
 	"time"
 
@@ -89,7 +89,7 @@ func (g *Gateway) probeLocalNamespaces(ctx context.Context) {
 	}
 
 	query := `
-		SELECT nc.namespace_name, npa.rqlite_http_port, npa.olric_memberlist_port, npa.gateway_http_port
+		SELECT nc.namespace_name, npa.rqlite_http_port, npa.olric_http_port, npa.gateway_http_port
 		FROM namespace_port_allocations npa
 		JOIN namespace_clusters nc ON npa.namespace_cluster_id = nc.id
 		WHERE npa.node_id = ? AND nc.status = 'ready'
@@ -117,7 +117,7 @@ func (g *Gateway) probeLocalNamespaces(ctx context.Context) {
 		// Probe RQLite (HTTP on localhost)
 		nsHealth.Services["rqlite"] = probeTCP("127.0.0.1", rqlitePort)
 
-		// Probe Olric memberlist (binds to WireGuard IP)
+		// Probe Olric HTTP API (binds to WireGuard IP)
 		olricHost := g.localWireGuardIP
 		if olricHost == "" {
 			olricHost = "127.0.0.1"
@@ -238,7 +238,7 @@ func (g *Gateway) isRQLiteLeader(ctx context.Context) bool {
 // probeTCP checks if a port is listening by attempting a TCP connection.
 func probeTCP(host string, port int) NamespaceServiceHealth {
 	start := time.Now()
-	addr := fmt.Sprintf("%s:%d", host, port)
+	addr := net.JoinHostPort(host, strconv.Itoa(port))
 	conn, err := net.DialTimeout("tcp", addr, 2*time.Second)
 	latency := time.Since(start)