feat(auth): OIDC/Keycloak SSO-Login (additiv) — v1.2.91

SSO per OpenID Connect (Authorization Code + PKCE) zusätzlich zum lokalen Login. - Regeln: kein Auto-Provisioning (E-Mail muss als User existieren), Rolle aus DB (nie aus Token), lokaler Login+TOTP unangetastet. - Migration 0040: oidc_settings (Singleton, client_secret_enc via secrets.Box) + users.oidc_subject. - internal/services/oidc: Settings-Repo (write-only Secret) + lazy go-oidc Client (testbarer Authenticator-Seam). - internal/handlers/oidc.go: GET/PUT /oidc/settings (admin), GET /auth/oidc/{settings,login,callback}. Flow-State (state/PKCE/nonce) stateless im 5-min signierten HttpOnly-Cookie (SameSite=Lax). email_verified erzwungen, opportunistisches sub-Linking, Session via setSessionCookie+Signer. - session.SignBlob/VerifyBlob; users.Get/SetOIDCSubject; main.go-Wiring. - Frontend: App.tsx /auth/me-Bootstrap (für Cookie-Session nach Callback), Login-SSO-Button + sso_error, Settings OIDC-Card, i18n de/en. - Tests (guarded EG_FWTEST_DSN): Secret-Roundtrip + Callback (Rolle-aus-DB, no_account, disabled, unverified, nonce, state). Deps: go-oidc/v3, x/oauth2. Scope v1: nur Login (kein SLO/Refresh). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
test(firewall): End-to-End-IPv6-Test (echte DB + Generator + nft -c)
2026-06-05 16:04:13 +02:00 · 2026-06-05 10:15:06 +02:00 · 2026-06-04 22:17:34 +02:00 · 2026-06-04 21:04:38 +02:00 · 2026-06-04 13:39:44 +02:00 · 2026-06-04 13:35:32 +02:00
24 changed files with 1824 additions and 60 deletions
--- a/2
+++ b/2
@@ -1 +1 @@
-1.2.88
+1.2.91
--- a/cmd/edgeguard-api/main.go
+++ b/cmd/edgeguard-api/main.go
@@ -58,6 +58,7 @@ import (
 	"git.netcell-it.de/projekte/edgeguard-native/internal/services/setup"
 	"git.netcell-it.de/projekte/edgeguard-native/internal/services/tlscerts"
 	wgsvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/wireguard"
+	oidcsvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/oidc"
 	usersvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/users"
 	wafsvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/waf"
 )
@@ -316,6 +317,14 @@ func main() {
 		authed.Use(requireAuth, handlers.RequireAdminForMutations())
 		setupHdl.RegisterAuthed(authed)
 		handlers.NewUsersHandler(usersRepo, auditRepo, nodeID).Register(authed)
+
+		// OIDC/Keycloak SSO — public Flow-Endpoints auf v1 (hinter SetupGate),
+		// Admin-Settings auf authed (PUT nur admin via RequireAdminForMutations).
+		oidcRepo := oidcsvc.New(pool, secretsBox)
+		oidcHdl := handlers.NewOIDCHandler(oidcRepo, oidcsvc.NewClient(oidcRepo), usersRepo, signer, setupStore).
+			WithAudit(auditRepo, nodeID)
+		oidcHdl.RegisterPublic(v1)
+		oidcHdl.RegisterAdmin(authed)
 		handlers.NewDomainsHandler(domainsRepo, routingRepo, domainHeadersRepo, auditRepo, nodeID, haproxyReloader).Register(authed)
 		handlers.NewBackendsHandler(backendsRepo, auditRepo, nodeID, haproxyReloader).Register(authed)
 		handlers.NewBackendServersHandler(backendServersRepo, auditRepo, nodeID, haproxyReloader).Register(authed)
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.26.0

 require (
 	github.com/corazawaf/coraza/v3 v3.7.0
+	github.com/coreos/go-oidc/v3 v3.18.0
 	github.com/dropmorepackets/haproxy-go v0.0.8
 	github.com/fsnotify/fsnotify v1.10.1
 	github.com/gin-gonic/gin v1.10.0
@@ -16,6 +17,7 @@ require (
 	github.com/pressly/goose/v3 v3.27.1
 	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
 	golang.org/x/crypto v0.51.0
+	golang.org/x/oauth2 v0.36.0
 )

 require (
--- a/go.sum
+++ b/go.sum
@@ -19,6 +19,8 @@ github.com/corazawaf/coraza/v3 v3.7.0 h1:LIQqu1r+l6e/U/gyiZeykWaNNBY1TzRLz+aaI+Q
 github.com/corazawaf/coraza/v3 v3.7.0/go.mod h1:dOSt5evqC7EstouEv6ghhui01+oVUwp9X1vybWwqTlo=
 github.com/corazawaf/libinjection-go v0.3.2 h1:9rrKt0lpg4WvUXt+lwS06GywfqRXXsa/7JcOw5cQLwI=
 github.com/corazawaf/libinjection-go v0.3.2/go.mod h1:Ik/+w3UmTWH9yn366RgS9D95K3y7Atb5m/H/gXzzPCk=
+github.com/coreos/go-oidc/v3 v3.18.0 h1:V9orjXynvu5wiC9SemFTWnG4F45v403aIcjWo0d41+A=
+github.com/coreos/go-oidc/v3 v3.18.0/go.mod h1:DYCf24+ncYi+XkIH97GY1+dqoRlbaSI26KVTCI9SrY4=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -190,6 +192,8 @@ golang.org/x/mod v0.35.0 h1:Ww1D637e6Pg+Zb2KrWfHQUnH2dQRLBQyAtpr/haaJeM=
 golang.org/x/mod v0.35.0/go.mod h1:+GwiRhIInF8wPm+4AoT6L0FA1QWAad3OMdTRx4tFYlU=
 golang.org/x/net v0.53.0 h1:d+qAbo5L0orcWAr0a9JweQpjXF19LMXJE8Ey7hwOdUA=
 golang.org/x/net v0.53.0/go.mod h1:JvMuJH7rrdiCfbeHoo3fCQU24Lf5JJwT9W3sJFulfgs=
+golang.org/x/oauth2 v0.36.0 h1:peZ/1z27fi9hUOFCAZaHyrpWG5lwe0RJEEEeH0ThlIs=
+golang.org/x/oauth2 v0.36.0/go.mod h1:YDBUJMTkDnJS+A4BP4eZBjCqtokkg1hODuPjwiGPO7Q=
 golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
 golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.44.0 h1:ildZl3J4uzeKP07r2F++Op7E9B29JRUy+a27EibtBTQ=
--- a/internal/cluster/confighash.go
+++ b/internal/cluster/confighash.go
@@ -71,33 +71,16 @@ var hashSpec = []hashTable{

 	{Name: "ntp_pools", MigrationDefault: true},

-	// network_interfaces + ip_addresses werden seit 0030 repliziert —
-	// VLAN/Bridge/Bond-Definitionen und Gateway-IPs müssen auf dem Secondary
-	// für Failover bereitstehen. Ethernet-IPs werden im Secondary-Renderer
-	// herausgefiltert (eth0 = cloud-init / Keepalived).
+	// network_interfaces + ip_addresses sind BEWUSST NICHT im Drift-Hash.
+	// Sie stehen in cluster_replication.go localOnlyTables, werden also NICHT
+	// repliziert und sind per Design node-spezifisch (jede Node hat eigene
+	// Mgmt-/Host-IPs, z.B. utm-1=.6, utm-2=.8). Würde man sie hashen, wäre
+	// der config_hash zwischen zwei Nodes ZWANGSLÄUFIG dauerhaft verschieden
+	// → Drift-Banner, das kein Resync je beheben kann (Resync kopiert nur
+	// replizierte Tabellen). Migration 0030 wollte sie zwar replizieren,
+	// localOnlyTables schließt sie aber weiter aus → wir hashen sie nicht.
 	//
-	// ip_addresses.interface_id ist ein node-lokaler Autoincrement-PK, der
-	// zwischen zwei unabhängigen DBs divergiert (utm-1: eth0=6, utm-2: eth0=1).
-	// Wir hashen daher semantisch: address + prefix + flags + interface_name
-	// statt interface_id — sonst False-Positive-Drift auf logisch identischen Nodes.
-	{Name: "network_interfaces"},
-	{Name: "ip_addresses", CustomSQL: `
-		SELECT COALESCE(md5(string_agg(rh, '|' ORDER BY rh)), '')
-		FROM (
-		  SELECT md5(jsonb_build_object(
-		    'address',       ia.address,
-		    'prefix',        ia.prefix,
-		    'is_vip',        ia.is_vip,
-		    'active',        ia.active,
-		    'vip_priority',  ia.vip_priority,
-		    'description',   ia.description,
-		    'iface',         ni.name
-		  )::text) AS rh
-		  FROM ip_addresses ia
-		  JOIN network_interfaces ni ON ia.interface_id = ni.id
-		) sub`},
-
-	// static_routes, dns_settings, ntp_settings bleiben node-spezifisch.
+	// static_routes, dns_settings, ntp_settings bleiben ebenfalls node-spezifisch.
 }

 // hashSQL rendert die SHA-Input-SQL für eine Tabelle.
--- a/internal/database/migrations/0030_cluster_sync_replication.sql
+++ b/internal/database/migrations/0030_cluster_sync_replication.sql
@@ -1,10 +1,14 @@
 -- +goose Up
 -- +goose StatementBegin

-- network_interfaces und ip_addresses werden in die Cluster-Replikation
-- aufgenommen. Das ALTER PUBLICATION erfordert den Superuser (postgres),
-- daher läuft es im postinst via `sudo -u postgres psql`, nicht hier.
-- Diese Migration dient nur als Versions-Marker für goose.
+-- HINWEIS (korrigiert v1.2.89): Diese Migration war urspr. dafür gedacht,
+-- network_interfaces und ip_addresses in die Cluster-Replikation aufzunehmen.
+-- Das wurde NICHT umgesetzt und ist auch NICHT gewollt: beide Tabellen sind
+-- node-spezifisch (jede Node hat eigene Mgmt-/Host-IPs) und stehen weiterhin
+-- in cluster_replication.go localOnlyTables → sie werden bewusst NICHT
+-- repliziert. Sie sind auch aus dem Drift-Hash (confighash.go) entfernt,
+-- da sie sonst dauerhaften False-Positive-Drift erzeugen.
+-- Diese Migration ist ein No-op / reiner Versions-Marker für goose.
 SELECT 1;

 -- +goose StatementEnd
--- a/internal/database/migrations/0040_oidc_settings.sql
+++ b/internal/database/migrations/0040_oidc_settings.sql
@@ -0,0 +1,35 @@
+-- +goose Up
+-- +goose StatementBegin
+
+-- OIDC / Keycloak SSO — Singleton-Settings (analog forward_proxy_settings).
+-- client_secret_enc: secrets.Box.Seal-Output (AES-256-GCM), NULL = nicht gesetzt.
+-- Rolle kommt bewusst NICHT aus dem Token, daher keine group/role-claim-Spalten.
+CREATE TABLE IF NOT EXISTS oidc_settings (
+    id                INTEGER     PRIMARY KEY DEFAULT 1,
+    enabled           BOOLEAN     NOT NULL DEFAULT false,
+    issuer_url        TEXT        NOT NULL DEFAULT '',
+    client_id         TEXT        NOT NULL DEFAULT '',
+    client_secret_enc BYTEA,
+    scopes            TEXT        NOT NULL DEFAULT 'openid email profile',
+    email_claim       TEXT        NOT NULL DEFAULT 'email',
+    button_label      TEXT        NOT NULL DEFAULT 'Sign in with SSO',
+    created_at        TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at        TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CONSTRAINT oidc_settings_singleton CHECK (id = 1)
+);
+INSERT INTO oidc_settings (id) VALUES (1) ON CONFLICT DO NOTHING;
+
+-- Opportunistisches Linking: beim ersten SSO-Login wird der OIDC-'sub'
+-- gespeichert; weicht er später ab, wird der Login abgelehnt. Nullable,
+-- kein Backfill (Match-Schlüssel bleibt die verifizierte E-Mail).
+ALTER TABLE users ADD COLUMN IF NOT EXISTS oidc_subject TEXT;
+
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+
+ALTER TABLE users DROP COLUMN IF EXISTS oidc_subject;
+DROP TABLE IF EXISTS oidc_settings;
+
+-- +goose StatementEnd
--- a/internal/firewall/firewall.go
+++ b/internal/firewall/firewall.go
@@ -22,6 +22,7 @@ import (
 	"context"
 	_ "embed"
 	"fmt"
+	"log/slog"
 	"net"
 	"os/exec"
 	"path/filepath"
@@ -138,6 +139,7 @@ type View struct {
 type WGSiteMasqEntry struct {
 	Iface  string // wg interface name, e.g. "wg7"
 	VPNNet string // network CIDR of the VPN subnet, e.g. "192.168.99.0/24"
+	L3     string // "ip" oder "ip6" — Familie von VPNNet
 }

 // AutoFWRule is one auto-emitted inbound rule. Proto is "tcp" or
@@ -162,7 +164,11 @@ type RuleLeg struct {
 	DstIfaces []string
 	SrcAddrs  []string
 	DstAddrs  []string
-	Service   ResolvedService // Proto="" → no service match (any)
+	// L3 ist "ip" (IPv4) oder "ip6" (IPv6) für das Adress-Matching —
+	// gesetzt, sobald SrcAddrs/DstAddrs nicht leer sind. Bei adresslosen
+	// Regeln bleibt es "" (familienagnostisch, kein ip/ip6-Match).
+	L3      string
+	Service ResolvedService // Proto="" → no service match (any)
 }

 // ResolvedRule has all addresses + services already expanded so the
@@ -195,6 +201,12 @@ type ResolvedNATRule struct {
 	DPortStart, DPortEnd int
 	TargetAddr string
 	TargetPortStart, TargetPortEnd int
+	// L3 ist "ip" oder "ip6" — Adressfamilie der Regel (aus SrcCIDR/
+	// DstCIDR/TargetAddr abgeleitet). TargetHost ist TargetAddr, bei
+	// IPv6 MIT Port in eckigen Klammern ("[2001:db8::1]") für korrekte
+	// nft-dnat-Syntax.
+	L3         string
+	TargetHost string
 	Comment  string
 }

@@ -280,26 +292,15 @@ func (g *Generator) loadView(ctx context.Context) (*View, error) {
 	if err != nil {
 		return nil, err
 	}
-	// Expand to one Leg per (rule × service); rules without a service
-	// produce one leg with empty Proto.
+	// Expand to one Leg per (rule × service × address-family). Rules
+	// without a service produce one leg-set with empty Proto.
 	for _, r := range rules {
 		if len(r.Services) == 0 {
-			view.Legs = append(view.Legs, RuleLeg{
-				RuleID: r.ID, Action: r.Action, Log: r.Log, Name: r.Name,
-				Comment: r.Comment,
-				SrcIfaces: r.SrcIfaces, DstIfaces: r.DstIfaces,
-				SrcAddrs: r.SrcAddrs, DstAddrs: r.DstAddrs,
-			})
+			view.Legs = append(view.Legs, expandFamilyLegs(r, ResolvedService{}, false)...)
 			continue
 		}
 		for _, svc := range r.Services {
-			view.Legs = append(view.Legs, RuleLeg{
-				RuleID: r.ID, Action: r.Action, Log: r.Log, Name: r.Name,
-				Comment: r.Comment,
-				SrcIfaces: r.SrcIfaces, DstIfaces: r.DstIfaces,
-				SrcAddrs: r.SrcAddrs, DstAddrs: r.DstAddrs,
-				Service: svc,
-			})
+			view.Legs = append(view.Legs, expandFamilyLegs(r, svc, true)...)
 		}
 	}

@@ -323,9 +324,14 @@ func (g *Generator) loadView(ctx context.Context) (*View, error) {
 			if wgRows.Scan(&name, &cidr) == nil {
 				view.WGServerIfaces = append(view.WGServerIfaces, name)
 				if _, ipNet, err := net.ParseCIDR(cidr); err == nil {
+					l3 := addrFamily(ipNet.String())
+					if l3 == "" {
+						l3 = "ip"
+					}
 					view.WGSiteMasq = append(view.WGSiteMasq, WGSiteMasqEntry{
 						Iface:  name,
 						VPNNet: ipNet.String(),
+						L3:     l3,
 					})
 				}
 			}
@@ -435,6 +441,131 @@ func isLoopback(ip string) bool {
 	return strings.HasPrefix(ip, "127.")
 }

+// addrFamily klassifiziert einen nft-Adressausdruck (host, CIDR oder
+// range "a-b") als "ip" (IPv4), "ip6" (IPv6) oder "" (unbestimmt, z.B.
+// FQDN-Platzhalter). Adressen enthalten selbst kein '-', daher trennt der
+// erste Bindestrich sicher eine Range in ihr erstes Element.
+func addrFamily(expr string) string {
+	expr = strings.TrimSpace(expr)
+	if expr == "" {
+		return ""
+	}
+	if i := strings.IndexByte(expr, '-'); i > 0 {
+		expr = strings.TrimSpace(expr[:i])
+	}
+	if i := strings.IndexByte(expr, '/'); i > 0 {
+		expr = expr[:i]
+	}
+	ip := net.ParseIP(expr)
+	if ip == nil {
+		return ""
+	}
+	if ip.To4() != nil {
+		return "ip"
+	}
+	return "ip6"
+}
+
+// splitByFamily teilt eine Liste von nft-Adressausdrücken in v4 und v6.
+// Unbestimmte (FQDN o.ä.) werden verworfen.
+func splitByFamily(exprs []string) (v4, v6 []string) {
+	for _, e := range exprs {
+		switch addrFamily(e) {
+		case "ip":
+			v4 = append(v4, e)
+		case "ip6":
+			v6 = append(v6, e)
+		}
+	}
+	return v4, v6
+}
+
+// serviceL3: icmp ist v4-only, icmpv6 v6-only, tcp/udp/leer agnostisch.
+func serviceL3(svc ResolvedService) string {
+	switch svc.Proto {
+	case "icmp":
+		return "ip"
+	case "icmpv6":
+		return "ip6"
+	default:
+		return ""
+	}
+}
+
+// natFamily ermittelt die Adressfamilie einer NAT-Regel aus ihren
+// Adressen. ok=false bei gemischten v4/v6-Adressen (ungültig → die Regel
+// muss übersprungen werden, sonst bricht `nft -f` das gesamte Ruleset).
+func natFamily(r ResolvedNATRule) (fam string, ok bool) {
+	for _, a := range []string{r.SrcCIDR, r.DstCIDR, r.TargetAddr} {
+		f := addrFamily(a)
+		if f == "" {
+			continue
+		}
+		if fam == "" {
+			fam = f
+		} else if fam != f {
+			return "", false
+		}
+	}
+	if fam == "" {
+		fam = "ip" // keine Adressen (reine iface/proto-Regel) → v4-Default
+	}
+	return fam, true
+}
+
+// expandFamilyLegs materialisiert die nft-Zeilen für eine Regel + optional
+// einen Service, getrennt nach Adressfamilie. Adresslose Regeln ergeben eine
+// einzige familienagnostische Zeile (unverändertes v4-Verhalten, greift
+// zugleich für v6). Regeln mit Adressen werden pro Familie als separate
+// Zeile emittiert — ein nft-Paket ist immer entweder v4 oder v6.
+func expandFamilyLegs(r ResolvedRule, svc ResolvedService, hasSvc bool) []RuleLeg {
+	base := RuleLeg{
+		RuleID: r.ID, Action: r.Action, Log: r.Log, Name: r.Name, Comment: r.Comment,
+		SrcIfaces: r.SrcIfaces, DstIfaces: r.DstIfaces,
+	}
+	if hasSvc {
+		base.Service = svc
+	}
+
+	if len(r.SrcAddrs) == 0 && len(r.DstAddrs) == 0 {
+		// Kein Adress-Match → eine Zeile, L3 leer. Die Proto-Render-Logik
+		// im Template setzt icmp/icmpv6 selbst familienkorrekt.
+		return []RuleLeg{base}
+	}
+
+	src4, src6 := splitByFamily(r.SrcAddrs)
+	dst4, dst6 := splitByFamily(r.DstAddrs)
+	svcFam := ""
+	if hasSvc {
+		svcFam = serviceL3(svc)
+	}
+
+	var legs []RuleLeg
+	for _, fam := range []string{"ip", "ip6"} {
+		if svcFam != "" && svcFam != fam {
+			continue // icmp nur auf v4, icmpv6 nur auf v6
+		}
+		srcF, dstF := src4, dst4
+		if fam == "ip6" {
+			srcF, dstF = src6, dst6
+		}
+		// Eine eingeschränkte Seite ohne Mitglied dieser Familie → die
+		// Zeile würde nichts (oder Falsches) matchen → überspringen.
+		if len(r.SrcAddrs) > 0 && len(srcF) == 0 {
+			continue
+		}
+		if len(r.DstAddrs) > 0 && len(dstF) == 0 {
+			continue
+		}
+		leg := base
+		leg.L3 = fam
+		leg.SrcAddrs = srcF
+		leg.DstAddrs = dstF
+		legs = append(legs, leg)
+	}
+	return legs
+}
+
 // addrObjMap is keyed by id; value is the nft expression for that
 // object (e.g. "1.2.3.4", "10.0.0.0/24", "1.2.3.4-1.2.3.10").
 type addrObjMap map[int64]string
@@ -693,6 +824,19 @@ ORDER BY priority DESC, id ASC`)
 		if outZone != nil {
 			r.OutIfaces = zoneIfaces[*outZone]
 		}
+		fam, ok := natFamily(r)
+		if !ok {
+			// Gemischte v4/v6-Adressen → ungültige NAT-Regel. Überspringen
+			// statt das gesamte Ruleset mit `nft -f` zu brechen.
+			slog.Warn("firewall: NAT-Regel mit gemischten v4/v6-Adressen übersprungen", "id", r.ID)
+			continue
+		}
+		r.L3 = fam
+		r.TargetHost = r.TargetAddr
+		if fam == "ip6" && r.TargetAddr != "" && r.TargetPortStart > 0 {
+			// nft braucht [v6]:port für dnat-Targets mit Port.
+			r.TargetHost = "[" + r.TargetAddr + "]"
+		}
 		out = append(out, r)
 	}
 	return out, rows.Err()
--- a/internal/firewall/firewall_e2e_test.go
+++ b/internal/firewall/firewall_e2e_test.go
@@ -0,0 +1,132 @@
+package firewall
+
+import (
+	"context"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"git.netcell-it.de/projekte/edgeguard-native/internal/database"
+)
+
+// TestE2E_IPv6Render fährt den ECHTEN Generator gegen eine Test-DB:
+// alle Migrations + v4/v6-Seed + RenderToString + nft -c. Nur aktiv, wenn
+// EG_FWTEST_DSN gesetzt ist (sonst Skip — `go test ./...` bleibt DB-frei).
+func TestE2E_IPv6Render(t *testing.T) {
+	dsn := os.Getenv("EG_FWTEST_DSN")
+	if dsn == "" {
+		t.Skip("set EG_FWTEST_DSN to run the firewall end-to-end test")
+	}
+	ctx := context.Background()
+	if err := database.Migrate(ctx, dsn); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	pool, err := database.Open(ctx, dsn)
+	if err != nil {
+		t.Fatalf("open: %v", err)
+	}
+	defer pool.Close()
+
+	for _, tbl := range []string{
+		"firewall_nat_rules", "firewall_rules",
+		"firewall_address_group_members", "firewall_address_groups",
+		"firewall_address_objects", "network_interfaces",
+	} {
+		if _, err := pool.Exec(ctx, "DELETE FROM "+tbl); err != nil {
+			t.Fatalf("clean %s: %v", tbl, err)
+		}
+	}
+
+	mustExec := func(sql string, args ...any) {
+		t.Helper()
+		if _, err := pool.Exec(ctx, sql, args...); err != nil {
+			t.Fatalf("seed failed (%s): %v", sql, err)
+		}
+	}
+	insID := func(sql string, args ...any) int64 {
+		t.Helper()
+		var id int64
+		if err := pool.QueryRow(ctx, sql, args...).Scan(&id); err != nil {
+			t.Fatalf("seed-id failed (%s): %v", sql, err)
+		}
+		return id
+	}
+
+	mustExec(`INSERT INTO network_interfaces (name,type,role) VALUES ('eth0','ethernet','wan'),('eth1','ethernet','lan')`)
+
+	v4net := insID(`INSERT INTO firewall_address_objects (name,kind,value) VALUES ('v4net','network','10.0.0.0/24') RETURNING id`)
+	v6net := insID(`INSERT INTO firewall_address_objects (name,kind,value) VALUES ('v6net','network','2001:db8:1::/64') RETURNING id`)
+	v6host := insID(`INSERT INTO firewall_address_objects (name,kind,value) VALUES ('v6host','host','2001:db8:2::5') RETURNING id`)
+	v6range := insID(`INSERT INTO firewall_address_objects (name,kind,value) VALUES ('v6range','range','2001:db8:3::1-2001:db8:3::9') RETURNING id`)
+
+	// Gemischte Gruppe (v4 + v6) → muss in zwei Familien-Zeilen splitten.
+	grp := insID(`INSERT INTO firewall_address_groups (name) VALUES ('mixed') RETURNING id`)
+	mustExec(`INSERT INTO firewall_address_group_members (group_id,object_id) VALUES ($1,$2),($1,$3)`, grp, v4net, v6net)
+
+	httpsSvc := insID(`INSERT INTO firewall_services (name,proto,port_start,port_end,builtin,description) VALUES ('t-https','tcp',443,443,false,'')
+		ON CONFLICT (name) DO UPDATE SET proto=excluded.proto RETURNING id`)
+	var pingV6 int64
+	_ = pool.QueryRow(ctx, `SELECT id FROM firewall_services WHERE proto='icmpv6' LIMIT 1`).Scan(&pingV6)
+
+	// (1) gemischte Gruppe + tcp443 → je eine ip- und ip6-Zeile.
+	mustExec(`INSERT INTO firewall_rules (name,action,src_zone,src_address_group_id,service_object_id) VALUES ('mixed-https','accept','any',$1,$2)`, grp, httpsSvc)
+	// (2) v6-host + icmpv6 → eine ip6-Zeile.
+	if pingV6 != 0 {
+		mustExec(`INSERT INTO firewall_rules (name,action,src_address_object_id,service_object_id) VALUES ('v6-ping','accept',$1,$2)`, v6host, pingV6)
+	}
+	// (3) v6-range src + v6net dst (kein Service).
+	mustExec(`INSERT INTO firewall_rules (name,action,src_address_object_id,dst_address_object_id) VALUES ('v6-range','drop',$1,$2)`, v6range, v6net)
+
+	// (a) v6-DNAT mit Port → dnat to [..]:port.
+	mustExec(`INSERT INTO firewall_nat_rules (name,kind,proto,match_dst_cidr,match_dport_start,target_addr,target_port_start) VALUES ('v6-dnat','dnat','tcp','2001:db8:9::/64',80,'2001:db8:9::2',8080)`)
+	// (b) v4-DNAT (Regression).
+	mustExec(`INSERT INTO firewall_nat_rules (name,kind,proto,match_dst_cidr,match_dport_start,target_addr,target_port_start) VALUES ('v4-dnat','dnat','tcp','1.2.3.4',80,'10.0.0.5',80)`)
+	// (c) gemischte Familie (v4 src, v6 target) → MUSS übersprungen werden.
+	mustExec(`INSERT INTO firewall_nat_rules (name,kind,proto,match_src_cidr,target_addr) VALUES ('mixed-snat','snat','any','10.0.0.0/24','2001:db8::99')`)
+
+	out, err := New(pool).RenderToString(ctx)
+	if err != nil {
+		t.Fatalf("render: %v", err)
+	}
+
+	for _, w := range []string{
+		"ip saddr { 10.0.0.0/24 }",
+		"ip6 saddr { 2001:db8:1::/64 }",
+		"ip6 nexthdr icmpv6",
+		"ip6 saddr { 2001:db8:3::1-2001:db8:3::9 }",
+		"dnat to [2001:db8:9::2]:8080",
+		"dnat to 10.0.0.5:80",
+	} {
+		if !strings.Contains(out, w) {
+			t.Errorf("rendered output missing %q\n----\n%s", w, out)
+		}
+	}
+	if strings.Contains(out, "2001:db8::99") {
+		t.Errorf("mixed-family NAT rule was not skipped\n----\n%s", out)
+	}
+
+	nft, err := exec.LookPath("nft")
+	if err != nil {
+		t.Skip("nft not in PATH — skipping syntax check")
+	}
+	f, err := os.CreateTemp(t.TempDir(), "e2e-*.nft")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _ = f.WriteString(out)
+	f.Close()
+	var cmd *exec.Cmd
+	if os.Geteuid() == 0 {
+		cmd = exec.Command(nft, "-c", "-f", f.Name())
+	} else {
+		cmd = exec.Command("sudo", "-n", nft, "-c", "-f", f.Name())
+	}
+	if combined, err := cmd.CombinedOutput(); err != nil {
+		msg := string(combined)
+		if strings.Contains(msg, "Operation not permitted") || strings.Contains(msg, "password is required") {
+			t.Skipf("nft -c needs root (no usable sudo): %s", strings.TrimSpace(msg))
+		}
+		t.Fatalf("nft -c rejected the real-rendered ruleset: %v\n%s\n----\n%s", err, combined, out)
+	}
+}
--- a/internal/firewall/firewall_ipv6_test.go
+++ b/internal/firewall/firewall_ipv6_test.go
@@ -0,0 +1,183 @@
+package firewall
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func TestAddrFamily(t *testing.T) {
+	cases := map[string]string{
+		"1.2.3.4":                 "ip",
+		"10.0.0.0/24":             "ip",
+		"1.2.3.4-1.2.3.10":        "ip",
+		"2001:db8::1":             "ip6",
+		"fd00::/64":               "ip6",
+		"2001:db8::1-2001:db8::5": "ip6",
+		"example.com":             "",
+		"":                        "",
+	}
+	for in, want := range cases {
+		if got := addrFamily(in); got != want {
+			t.Errorf("addrFamily(%q)=%q want %q", in, got, want)
+		}
+	}
+}
+
+func TestExpandFamilyLegs_splitsByFamily(t *testing.T) {
+	r := ResolvedRule{
+		ID: 1, Action: "accept",
+		SrcAddrs: []string{"10.0.0.0/24", "fd00::/64"},
+		DstAddrs: []string{"1.2.3.4", "2001:db8::1"},
+	}
+	legs := expandFamilyLegs(r, ResolvedService{}, false)
+	if len(legs) != 2 {
+		t.Fatalf("want 2 legs (v4+v6), got %d", len(legs))
+	}
+	var v4, v6 *RuleLeg
+	for i := range legs {
+		switch legs[i].L3 {
+		case "ip":
+			v4 = &legs[i]
+		case "ip6":
+			v6 = &legs[i]
+		}
+	}
+	if v4 == nil || v6 == nil {
+		t.Fatalf("missing family leg: %+v", legs)
+	}
+	if len(v4.SrcAddrs) != 1 || v4.SrcAddrs[0] != "10.0.0.0/24" || v4.DstAddrs[0] != "1.2.3.4" {
+		t.Errorf("v4 leg wrong: src=%v dst=%v", v4.SrcAddrs, v4.DstAddrs)
+	}
+	if len(v6.SrcAddrs) != 1 || v6.SrcAddrs[0] != "fd00::/64" || v6.DstAddrs[0] != "2001:db8::1" {
+		t.Errorf("v6 leg wrong: src=%v dst=%v", v6.SrcAddrs, v6.DstAddrs)
+	}
+}
+
+func TestExpandFamilyLegs_addresslessIsAgnostic(t *testing.T) {
+	legs := expandFamilyLegs(ResolvedRule{ID: 2, Action: "accept"}, ResolvedService{}, false)
+	if len(legs) != 1 || legs[0].L3 != "" {
+		t.Fatalf("addressless rule must be a single agnostic leg, got %d legs L3=%q", len(legs), legs[0].L3)
+	}
+}
+
+func TestExpandFamilyLegs_oneFamilyOnly(t *testing.T) {
+	// src nur v4, dst nur v4 → genau eine v4-Zeile (kein leerer v6-Leg).
+	r := ResolvedRule{ID: 3, Action: "drop", SrcAddrs: []string{"10.0.0.0/8"}}
+	legs := expandFamilyLegs(r, ResolvedService{}, false)
+	if len(legs) != 1 || legs[0].L3 != "ip" {
+		t.Fatalf("v4-only rule want 1 ip leg, got %+v", legs)
+	}
+}
+
+func TestExpandFamilyLegs_icmpFamilyMatch(t *testing.T) {
+	r6 := ResolvedRule{ID: 4, Action: "accept", SrcAddrs: []string{"fd00::/64"}}
+	if legs := expandFamilyLegs(r6, ResolvedService{Proto: "icmpv6"}, true); len(legs) != 1 || legs[0].L3 != "ip6" {
+		t.Fatalf("icmpv6+v6 want 1 ip6 leg, got %+v", legs)
+	}
+	if legs := expandFamilyLegs(r6, ResolvedService{Proto: "icmp"}, true); len(legs) != 0 {
+		t.Fatalf("icmp on v6-only addrs want 0 legs, got %+v", legs)
+	}
+}
+
+func TestNatFamily(t *testing.T) {
+	if _, ok := natFamily(ResolvedNATRule{SrcCIDR: "10.0.0.0/24", TargetAddr: "2001:db8::1"}); ok {
+		t.Error("mixed v4/v6 NAT must be rejected (ok=false)")
+	}
+	if fam, ok := natFamily(ResolvedNATRule{TargetAddr: "2001:db8::1"}); !ok || fam != "ip6" {
+		t.Errorf("v6 NAT: fam=%q ok=%v want ip6/true", fam, ok)
+	}
+	if fam, ok := natFamily(ResolvedNATRule{SrcCIDR: "10.0.0.0/24"}); !ok || fam != "ip" {
+		t.Errorf("v4 NAT: fam=%q ok=%v want ip/true", fam, ok)
+	}
+	if fam, ok := natFamily(ResolvedNATRule{}); !ok || fam != "ip" {
+		t.Errorf("addressless NAT: fam=%q ok=%v want ip/true (v4 default)", fam, ok)
+	}
+}
+
+// renderView ist ein gemischter v4/v6-View, der alle geänderten
+// Template-Zweige berührt.
+func renderView(t *testing.T) string {
+	t.Helper()
+	view := &View{
+		PeerIPv4: []string{"10.0.0.1"},
+		PeerIPv6: []string{"fd00::1"},
+		Legs: []RuleLeg{
+			{RuleID: 1, Action: "accept", L3: "ip", SrcAddrs: []string{"10.0.0.0/24"}, Service: ResolvedService{Proto: "tcp", PortStart: 443}},
+			{RuleID: 1, Action: "accept", L3: "ip6", SrcAddrs: []string{"fd00::/64"}, Service: ResolvedService{Proto: "tcp", PortStart: 443}},
+			{RuleID: 2, Action: "accept", Service: ResolvedService{Proto: "icmpv6"}}, // adresslos, agnostisch
+		},
+		NATRules: []ResolvedNATRule{
+			{ID: 5, Kind: "dnat", L3: "ip6", DstCIDR: "2001:db8::/64", Proto: "tcp", DPortStart: 80, TargetAddr: "fd00::2", TargetHost: "[fd00::2]", TargetPortStart: 8080},
+			{ID: 6, Kind: "snat", L3: "ip6", SrcCIDR: "fd00::/64", TargetAddr: "2001:db8::99"},
+			{ID: 7, Kind: "dnat", L3: "ip", DstCIDR: "1.2.3.4", Proto: "tcp", DPortStart: 80, TargetAddr: "10.0.0.5", TargetHost: "10.0.0.5", TargetPortStart: 80},
+		},
+		WGSiteMasq: []WGSiteMasqEntry{{Iface: "wg7", VPNNet: "fd00:99::/64", L3: "ip6"}},
+	}
+	var buf bytes.Buffer
+	if err := tpl.Execute(&buf, view); err != nil {
+		t.Fatalf("template execute: %v", err)
+	}
+	return buf.String()
+}
+
+func TestTemplate_v6AndV4Render(t *testing.T) {
+	out := renderView(t)
+	mustContain := []string{
+		"ip saddr { 10.0.0.0/24 }",       // v4-Regel unverändert
+		"ip6 saddr { fd00::/64 }",        // v6-Regel
+		"ip6 daddr 2001:db8::/64",        // v6-DNAT-Match
+		"dnat to [fd00::2]:8080",         // v6-DNAT-Target geklammert
+		"dnat to 10.0.0.5:80",            // v4-DNAT-Target unverändert
+		"ip6 saddr fd00::/64 snat to 2001:db8::99",
+		`oifname "wg7" ip6 saddr fd00:99::/64 masquerade`,
+	}
+	for _, w := range mustContain {
+		if !strings.Contains(out, w) {
+			t.Errorf("output missing %q\n----\n%s", w, out)
+		}
+	}
+	// v6-Adressen dürfen NIEMALS in einem ip-saddr/daddr-Set landen.
+	if strings.Contains(out, "ip saddr { fd00") || strings.Contains(out, "ip daddr { fd00") ||
+		strings.Contains(out, "ip saddr { 2001") {
+		t.Errorf("v6 address leaked into IPv4 match\n----\n%s", out)
+	}
+}
+
+// TestTemplate_nftSyntax validiert das gerenderte Ruleset mit `nft -c -f`
+// (Check-Modus, kein Apply). Wird übersprungen, wenn nft nicht installiert
+// ist (z.B. CI ohne nft).
+func TestTemplate_nftSyntax(t *testing.T) {
+	nft, err := exec.LookPath("nft")
+	if err != nil {
+		t.Skip("nft binary not available — skipping syntax check")
+	}
+	out := renderView(t)
+	f, err := os.CreateTemp(t.TempDir(), "ruleset-*.nft")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := f.WriteString(out); err != nil {
+		t.Fatal(err)
+	}
+	f.Close()
+	// `nft -c` liest die Kernel-Ruleset-Cache via netlink → braucht root.
+	// Als nicht-root via sudo -n versuchen; klappt das nicht, skip statt fail
+	// (auf den Nodes rendert/prüft edgeguard ohnehin als root).
+	var cmd *exec.Cmd
+	if os.Geteuid() == 0 {
+		cmd = exec.Command(nft, "-c", "-f", f.Name())
+	} else {
+		cmd = exec.Command("sudo", "-n", nft, "-c", "-f", f.Name())
+	}
+	combined, err := cmd.CombinedOutput()
+	if err != nil {
+		msg := string(combined)
+		if strings.Contains(msg, "Operation not permitted") || strings.Contains(msg, "a password is required") || strings.Contains(msg, "may not run sudo") {
+			t.Skipf("nft -c needs root (no usable sudo): %s", strings.TrimSpace(msg))
+		}
+		t.Fatalf("nft -c -f rejected the generated ruleset: %v\n%s\n----\n%s", err, combined, out)
+	}
+}
--- a/internal/firewall/ruleset.nft.tpl
+++ b/internal/firewall/ruleset.nft.tpl
@@ -71,7 +71,7 @@ table inet edgeguard {
                 die Comment-Zeile angehängt — sonst frisst nft die rule
                 als Teil des # Kommentars). */ -}}
        {{""}}
-        {{if .SrcIfaces}}iifname { {{join .SrcIfaces ", "}} } {{end}}{{if .DstIfaces}}oifname { {{join .DstIfaces ", "}} } {{end}}{{if .SrcAddrs}}ip saddr { {{join .SrcAddrs ", "}} } {{end}}{{if .DstAddrs}}ip daddr { {{join .DstAddrs ", "}} } {{end}}{{with .Service}}{{if and (or (eq .Proto "tcp") (eq .Proto "udp")) .PortStart}}{{.Proto}} dport {{.PortStart}}{{if and .PortEnd (ne .PortEnd .PortStart)}}-{{.PortEnd}}{{end}} {{else if eq .Proto "icmp"}}ip protocol icmp {{else if eq .Proto "icmpv6"}}ip6 nexthdr icmpv6 {{end}}{{end}}{{if .Log}}log prefix "edgeguard:{{.RuleID}} " group 0 {{end}}counter {{.Action}} comment "egid:{{.RuleID}}"
+        {{if .SrcIfaces}}iifname { {{join .SrcIfaces ", "}} } {{end}}{{if .DstIfaces}}oifname { {{join .DstIfaces ", "}} } {{end}}{{if .SrcAddrs}}{{.L3}} saddr { {{join .SrcAddrs ", "}} } {{end}}{{if .DstAddrs}}{{.L3}} daddr { {{join .DstAddrs ", "}} } {{end}}{{with .Service}}{{if and (or (eq .Proto "tcp") (eq .Proto "udp")) .PortStart}}{{.Proto}} dport {{.PortStart}}{{if and .PortEnd (ne .PortEnd .PortStart)}}-{{.PortEnd}}{{end}} {{else if eq .Proto "icmp"}}ip protocol icmp {{else if eq .Proto "icmpv6"}}ip6 nexthdr icmpv6 {{end}}{{end}}{{if .Log}}log prefix "edgeguard:{{.RuleID}} " group 0 {{end}}counter {{.Action}} comment "egid:{{.RuleID}}"
 {{end}}

        # ── DEFAULT-DROP LOGGING ───────────────────────────────────────
@@ -101,7 +101,7 @@ table inet edgeguard {
        # nach und erlauben new-state-Pakete von dort. Return-Pakete
        # gehen via ct state established schon durch.
 {{range .NATRules}}{{if or (eq .Kind "snat") (eq .Kind "masquerade")}}{{if .SrcCIDR}}
-        ip saddr {{.SrcCIDR}} ct state new accept comment "auto-forward for NAT rule {{.ID}}"
+        {{.L3}} saddr {{.SrcCIDR}} ct state new accept comment "auto-forward for NAT rule {{.ID}}"
 {{end}}{{end}}{{end}}

        # Auto-Forward für WireGuard-Server-Interfaces: Peer-to-Peer-
@@ -128,7 +128,7 @@ table inet edgeguard {
        {{""}}
        {{/* nft-Syntax: erst L3-match (ip saddr/daddr), DANN L4 (tcp/udp dport).
             Sonst quittiert der parser '... unexpected ip' an dieser Stelle. */}}
-        {{if .InIfaces}}iifname { {{join .InIfaces ", "}} } {{end}}{{if .SrcCIDR}}ip saddr {{.SrcCIDR}} {{end}}{{if .DstCIDR}}ip daddr {{.DstCIDR}} {{end}}{{if and .Proto (ne .Proto "any")}}{{.Proto}} {{else}}meta l4proto { tcp, udp } {{end}}{{if .DPortStart}}dport {{.DPortStart}}{{if and .DPortEnd (ne .DPortEnd .DPortStart)}}-{{.DPortEnd}}{{end}} {{end}}{{if .TargetAddr}}dnat to {{.TargetAddr}}{{if .TargetPortStart}}:{{.TargetPortStart}}{{if and .TargetPortEnd (ne .TargetPortEnd .TargetPortStart)}}-{{.TargetPortEnd}}{{end}}{{end}}{{end}}
+        {{if .InIfaces}}iifname { {{join .InIfaces ", "}} } {{end}}{{if .SrcCIDR}}{{.L3}} saddr {{.SrcCIDR}} {{end}}{{if .DstCIDR}}{{.L3}} daddr {{.DstCIDR}} {{end}}{{if and .Proto (ne .Proto "any")}}{{.Proto}} {{else}}meta l4proto { tcp, udp } {{end}}{{if .DPortStart}}dport {{.DPortStart}}{{if and .DPortEnd (ne .DPortEnd .DPortStart)}}-{{.DPortEnd}}{{end}} {{end}}{{if .TargetAddr}}dnat to {{.TargetHost}}{{if .TargetPortStart}}:{{.TargetPortStart}}{{if and .TargetPortEnd (ne .TargetPortEnd .TargetPortStart)}}-{{.TargetPortEnd}}{{end}}{{end}}{{end}}
 {{end}}{{end}}
    }

@@ -152,16 +152,16 @@ table inet edgeguard {
        # Masquerade schreibt die Source auf die lokale Tunnel-IP um; Return-Traffic
        # findet so den Weg zurück durch den Tunnel.
 {{range .WGSiteMasq}}
-        oifname "{{.Iface}}" ip saddr {{.VPNNet}} masquerade comment "auto: WireGuard site-to-site masquerade {{.Iface}}"
+        oifname "{{.Iface}}" {{.L3}} saddr {{.VPNNet}} masquerade comment "auto: WireGuard site-to-site masquerade {{.Iface}}"
 {{end}}
 {{range .NATRules}}{{if eq .Kind "snat"}}
        # NAT {{.ID}} (snat{{if .Comment}} — {{.Comment}}{{end}})
        {{""}}
-        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}ip saddr {{.SrcCIDR}} {{end}}{{if .TargetAddr}}snat to {{.TargetAddr}}{{end}}
+        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}{{.L3}} saddr {{.SrcCIDR}} {{end}}{{if .TargetAddr}}snat to {{.TargetAddr}}{{end}}
 {{end}}{{if eq .Kind "masquerade"}}
        # NAT {{.ID}} (masquerade{{if .Comment}} — {{.Comment}}{{end}})
        {{""}}
-        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}ip saddr {{.SrcCIDR}} {{end}}masquerade
+        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}{{.L3}} saddr {{.SrcCIDR}} {{end}}masquerade
 {{end}}{{end}}
    }
 }
--- a/internal/handlers/oidc.go
+++ b/internal/handlers/oidc.go
@@ -0,0 +1,349 @@
+package handlers
+
+import (
+	"crypto/rand"
+	"crypto/subtle"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"golang.org/x/oauth2"
+
+	"git.netcell-it.de/projekte/edgeguard-native/internal/handlers/response"
+	"git.netcell-it.de/projekte/edgeguard-native/internal/services/audit"
+	oidcsvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/oidc"
+	"git.netcell-it.de/projekte/edgeguard-native/internal/services/session"
+	"git.netcell-it.de/projekte/edgeguard-native/internal/services/setup"
+	usersvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/users"
+)
+
+// OIDC / Keycloak SSO. Additiv zum lokalen Passwort-Login. Regeln:
+//   - kein Auto-Provisioning (E-Mail muss als User existieren),
+//   - Rolle kommt aus der DB-Row (nie aus dem Token),
+//   - lokaler Login + TOTP bleiben unangetastet.
+//
+// Flow-State (state/PKCE-verifier/nonce) liegt stateless in einem 5-min
+// signierten HttpOnly-Cookie (SameSite=Lax, da der IdP-Redirect ein
+// top-level cross-site GET ist). Nach Erfolg wird dieselbe Session wie
+// beim lokalen Login ausgestellt (setSessionCookie + Signer).
+
+const (
+	oidcFlowCookie = "edgeguard_oidc_flow"
+	oidcFlowTTL    = 5 * time.Minute
+)
+
+type OIDCHandler struct {
+	Repo   *oidcsvc.Repo
+	Auth   oidcsvc.Authenticator
+	Users  *usersvc.Repo
+	Signer *session.Signer
+	Setup  *setup.Store
+	Audit  *audit.Repo
+	NodeID string
+}
+
+func NewOIDCHandler(repo *oidcsvc.Repo, auth oidcsvc.Authenticator, users *usersvc.Repo, signer *session.Signer, setupStore *setup.Store) *OIDCHandler {
+	return &OIDCHandler{Repo: repo, Auth: auth, Users: users, Signer: signer, Setup: setupStore}
+}
+
+func (h *OIDCHandler) WithAudit(a *audit.Repo, nodeID string) *OIDCHandler {
+	h.Audit = a
+	h.NodeID = nodeID
+	return h
+}
+
+// RegisterPublic mountet die unauth. Endpoints (auf v1, hinter SetupGate).
+func (h *OIDCHandler) RegisterPublic(rg *gin.RouterGroup) {
+	g := rg.Group("/auth/oidc")
+	g.GET("/settings", h.PublicSettings)
+	g.GET("/login", h.Login)
+	g.GET("/callback", h.Callback)
+}
+
+// RegisterAdmin mountet die Admin-Endpoints (auf authed: requireAuth +
+// RequireAdminForMutations → GET für alle, PUT nur admin).
+func (h *OIDCHandler) RegisterAdmin(rg *gin.RouterGroup) {
+	g := rg.Group("/oidc")
+	g.GET("/settings", h.GetSettings)
+	g.PUT("/settings", h.UpdateSettings)
+}
+
+// PublicSettings: nur, was die Login-Seite braucht.
+func (h *OIDCHandler) PublicSettings(c *gin.Context) {
+	s, err := h.Repo.Get(c.Request.Context())
+	if err != nil {
+		// Kein Datensatz/kein DB → SSO einfach „aus".
+		response.OK(c, gin.H{"enabled": false, "button_label": ""})
+		return
+	}
+	response.OK(c, gin.H{"enabled": s.Enabled, "button_label": s.ButtonLabel})
+}
+
+// GetSettings: Admin-Sicht ohne Secret, mit secret_configured + redirect_uri.
+func (h *OIDCHandler) GetSettings(c *gin.Context) {
+	s, err := h.Repo.Get(c.Request.Context())
+	if err != nil {
+		response.Internal(c, err)
+		return
+	}
+	hasSecret, _ := h.Repo.HasSecret(c.Request.Context())
+	response.OK(c, gin.H{
+		"enabled":          s.Enabled,
+		"issuer_url":       s.IssuerURL,
+		"client_id":        s.ClientID,
+		"scopes":           s.Scopes,
+		"email_claim":      s.EmailClaim,
+		"button_label":     s.ButtonLabel,
+		"secret_configured": hasSecret,
+		"redirect_uri":     h.redirectURI(c),
+	})
+}
+
+type oidcUpdateBody struct {
+	Enabled      bool    `json:"enabled"`
+	IssuerURL    string  `json:"issuer_url"`
+	ClientID     string  `json:"client_id"`
+	ClientSecret *string `json:"client_secret"` // nil = unverändert, "" = löschen
+	Scopes       string  `json:"scopes"`
+	EmailClaim   string  `json:"email_claim"`
+	ButtonLabel  string  `json:"button_label"`
+}
+
+// UpdateSettings: PUT (admin via RequireAdminForMutations).
+func (h *OIDCHandler) UpdateSettings(c *gin.Context) {
+	var body oidcUpdateBody
+	if err := c.ShouldBindJSON(&body); err != nil {
+		response.BadRequest(c, err)
+		return
+	}
+	body.IssuerURL = strings.TrimSpace(body.IssuerURL)
+	body.ClientID = strings.TrimSpace(body.ClientID)
+	if body.Scopes == "" {
+		body.Scopes = "openid email profile"
+	}
+	if body.EmailClaim == "" {
+		body.EmailClaim = "email"
+	}
+	if body.ButtonLabel == "" {
+		body.ButtonLabel = "Sign in with SSO"
+	}
+
+	if body.Enabled {
+		if body.IssuerURL == "" || body.ClientID == "" {
+			response.BadRequest(c, errors.New("issuer_url und client_id sind erforderlich, wenn OIDC aktiviert ist"))
+			return
+		}
+		if u, err := url.Parse(body.IssuerURL); err != nil || u.Scheme != "https" || u.Host == "" {
+			response.BadRequest(c, errors.New("issuer_url muss eine gültige https-URL sein"))
+			return
+		}
+		hasSecret, _ := h.Repo.HasSecret(c.Request.Context())
+		providing := body.ClientSecret != nil && *body.ClientSecret != ""
+		if !hasSecret && !providing {
+			response.BadRequest(c, errors.New("client_secret ist erforderlich (noch keins gespeichert)"))
+			return
+		}
+	}
+
+	if err := h.Repo.Update(c.Request.Context(), oidcsvc.UpdateInput{
+		Enabled:      body.Enabled,
+		IssuerURL:    body.IssuerURL,
+		ClientID:     body.ClientID,
+		Scopes:       body.Scopes,
+		EmailClaim:   body.EmailClaim,
+		ButtonLabel:  body.ButtonLabel,
+		ClientSecret: body.ClientSecret,
+	}); err != nil {
+		response.Internal(c, err)
+		return
+	}
+	h.audit(c, actorOf(c), "oidc.settings.updated", actorOf(c),
+		gin.H{"enabled": body.Enabled, "issuer": body.IssuerURL})
+	response.OK(c, gin.H{"ok": true})
+}
+
+// Login: 302 zum IdP. Setzt das signierte Flow-Cookie.
+func (h *OIDCHandler) Login(c *gin.Context) {
+	ctx := c.Request.Context()
+	s, err := h.Repo.Get(ctx)
+	if err != nil || !s.Enabled {
+		h.fail(c, "disabled")
+		return
+	}
+	state, err1 := randToken(24)
+	nonce, err2 := randToken(24)
+	if err1 != nil || err2 != nil {
+		h.fail(c, "server")
+		return
+	}
+	verifier := oauth2.GenerateVerifier()
+	redirectURI := h.redirectURI(c)
+
+	authURL, err := h.Auth.AuthCodeURL(ctx, redirectURI, state, nonce, verifier)
+	if err != nil {
+		h.fail(c, "config")
+		return
+	}
+
+	blob, _ := json.Marshal(oidcFlow{State: state, Verifier: verifier, Nonce: nonce})
+	signed, err := h.Signer.SignBlob(blob, oidcFlowTTL)
+	if err != nil {
+		h.fail(c, "server")
+		return
+	}
+	h.setFlowCookie(c, signed)
+	c.Redirect(http.StatusFound, authURL)
+}
+
+// Callback: verifiziert Flow + Token, mappt auf DB-User, stellt Session aus.
+func (h *OIDCHandler) Callback(c *gin.Context) {
+	ctx := c.Request.Context()
+
+	// Flow-Cookie lesen + sofort entwerten (single-use).
+	rawFlow, _ := c.Cookie(oidcFlowCookie)
+	h.clearFlowCookie(c)
+	if rawFlow == "" {
+		h.fail(c, "expired")
+		return
+	}
+	payload, err := h.Signer.VerifyBlob(rawFlow)
+	if err != nil {
+		h.fail(c, "expired")
+		return
+	}
+	var flow oidcFlow
+	if json.Unmarshal(payload, &flow) != nil {
+		h.fail(c, "expired")
+		return
+	}
+
+	if c.Query("error") != "" {
+		h.fail(c, "denied")
+		return
+	}
+	if subtle.ConstantTimeCompare([]byte(c.Query("state")), []byte(flow.State)) != 1 {
+		h.fail(c, "state")
+		return
+	}
+	code := c.Query("code")
+	if code == "" {
+		h.fail(c, "exchange")
+		return
+	}
+
+	claims, err := h.Auth.Exchange(ctx, h.redirectURI(c), code, flow.Verifier)
+	if err != nil {
+		h.fail(c, "token")
+		return
+	}
+	if subtle.ConstantTimeCompare([]byte(claims.Nonce), []byte(flow.Nonce)) != 1 {
+		h.fail(c, "nonce")
+		return
+	}
+	if !claims.EmailVerified || claims.Email == "" {
+		h.audit(c, claims.Email, "auth.login.failed", claims.Email,
+			gin.H{"via": "oidc", "reason": "email_unverified", "remote": c.ClientIP()})
+		h.fail(c, "unverified")
+		return
+	}
+
+	u, _, err := h.Users.FindByEmail(ctx, claims.Email)
+	if err != nil {
+		reason := "oidc_no_account"
+		if !errors.Is(err, usersvc.ErrNotFound) {
+			reason = "server"
+		}
+		h.audit(c, claims.Email, "auth.login.failed", claims.Email,
+			gin.H{"via": "oidc", "reason": reason, "remote": c.ClientIP()})
+		h.fail(c, map[bool]string{true: "no_account", false: "server"}[reason == "oidc_no_account"])
+		return
+	}
+	if !u.Active {
+		h.audit(c, u.Email, "auth.login.failed", u.Email,
+			gin.H{"via": "oidc", "reason": "account_disabled", "remote": c.ClientIP()})
+		h.fail(c, "disabled")
+		return
+	}
+
+	// Opportunistisches sub-Linking + Schutz gegen E-Mail-Reassignment.
+	if stored, err := h.Users.GetOIDCSubject(ctx, u.ID); err == nil {
+		if stored != "" && stored != claims.Subject {
+			h.audit(c, u.Email, "auth.login.failed", u.Email,
+				gin.H{"via": "oidc", "reason": "subject_mismatch", "remote": c.ClientIP()})
+			h.fail(c, "subject_mismatch")
+			return
+		}
+		if stored == "" {
+			_ = h.Users.SetOIDCSubject(ctx, u.ID, claims.Subject)
+		}
+	}
+
+	h.Users.RecordLogin(ctx, u.ID)
+
+	// Rolle STRIKT aus der DB-Row (nie aus Claims).
+	raw, tok, err := h.Signer.IssueWithRole(u.Email, u.Role)
+	if err != nil {
+		h.fail(c, "server")
+		return
+	}
+	setSessionCookie(c, raw, tok.Exp)
+	h.audit(c, u.Email, "auth.login.success", u.Email,
+		gin.H{"via": "oidc", "role": u.Role, "remote": c.ClientIP()})
+	c.Redirect(http.StatusFound, "/dashboard")
+}
+
+// ── Helpers ──────────────────────────────────────────────────────────
+
+type oidcFlow struct {
+	State    string `json:"s"`
+	Verifier string `json:"v"`
+	Nonce    string `json:"n"`
+}
+
+// redirectURI = https://<FQDN>/api/v1/auth/oidc/callback (FQDN aus setup.json,
+// Fallback Request-Host). Muss im IdP als Redirect-URI registriert sein.
+func (h *OIDCHandler) redirectURI(c *gin.Context) string {
+	host := ""
+	if h.Setup != nil {
+		if st, err := h.Setup.Load(); err == nil && st != nil {
+			host = strings.TrimSpace(st.FQDN)
+		}
+	}
+	if host == "" {
+		host = c.Request.Host
+	}
+	return "https://" + host + "/api/v1/auth/oidc/callback"
+}
+
+func (h *OIDCHandler) fail(c *gin.Context, reason string) {
+	c.Redirect(http.StatusFound, "/login?sso_error="+url.QueryEscape(reason))
+}
+
+func (h *OIDCHandler) audit(c *gin.Context, actor, action, subject string, detail any) {
+	if h.Audit != nil {
+		_ = h.Audit.Log(c.Request.Context(), actor, action, subject, detail, h.NodeID)
+	}
+}
+
+func (h *OIDCHandler) setFlowCookie(c *gin.Context, raw string) {
+	c.SetSameSite(http.SameSiteLaxMode)
+	c.SetCookie(oidcFlowCookie, raw, int(oidcFlowTTL.Seconds()), "/", "", true, true)
+}
+
+func (h *OIDCHandler) clearFlowCookie(c *gin.Context) {
+	c.SetSameSite(http.SameSiteLaxMode)
+	c.SetCookie(oidcFlowCookie, "", -1, "/", "", true, true)
+}
+
+func randToken(n int) (string, error) {
+	b := make([]byte, n)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
--- a/internal/handlers/oidc_test.go
+++ b/internal/handlers/oidc_test.go
@@ -0,0 +1,202 @@
+package handlers
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.netcell-it.de/projekte/edgeguard-native/internal/database"
+	oidcsvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/oidc"
+	"git.netcell-it.de/projekte/edgeguard-native/internal/services/session"
+	usersvc "git.netcell-it.de/projekte/edgeguard-native/internal/services/users"
+)
+
+// mockAuth erfüllt oidcsvc.Authenticator und liefert vorgegebene Claims —
+// kein echter IdP nötig.
+type mockAuth struct {
+	claims *oidcsvc.Claims
+	err    error
+}
+
+func (m *mockAuth) AuthCodeURL(_ context.Context, _, state, _, _ string) (string, error) {
+	return "https://idp.example/authorize?state=" + state, nil
+}
+func (m *mockAuth) Exchange(_ context.Context, _, _, _ string) (*oidcsvc.Claims, error) {
+	return m.claims, m.err
+}
+
+func oidcTestSetup(t *testing.T) (*usersvc.Repo, *pgxpool.Pool, *session.Signer) {
+	t.Helper()
+	dsn := os.Getenv("EG_FWTEST_DSN")
+	if dsn == "" {
+		t.Skip("set EG_FWTEST_DSN to run the oidc handler test")
+	}
+	ctx := context.Background()
+	// Retry: goose-Erst-Apply ist nicht concurrency-safe, wenn mehrere
+	// guarded Test-Pakete dieselbe frische DB parallel migrieren.
+	var mErr error
+	for i := 0; i < 3; i++ {
+		if mErr = database.Migrate(ctx, dsn); mErr == nil {
+			break
+		}
+		time.Sleep(700 * time.Millisecond)
+	}
+	if mErr != nil {
+		t.Fatalf("migrate: %v", mErr)
+	}
+	pool, err := database.Open(ctx, dsn)
+	if err != nil {
+		t.Fatalf("open: %v", err)
+	}
+	t.Cleanup(pool.Close)
+	return usersvc.New(pool), pool, session.NewSigner([]byte("0123456789abcdef0123456789abcdef"), nil, 0)
+}
+
+func seedUser(t *testing.T, repo *usersvc.Repo, pool *pgxpool.Pool, email, role string, active bool) {
+	t.Helper()
+	ctx := context.Background()
+	_, _ = pool.Exec(ctx, `DELETE FROM users WHERE email=$1`, email)
+	if _, err := repo.Create(ctx, email, "Sup3rSecret-pw-123", role, active); err != nil {
+		t.Fatalf("seed user: %v", err)
+	}
+}
+
+func runCallback(t *testing.T, h *OIDCHandler, flow oidcFlow, queryState, code string) *httptest.ResponseRecorder {
+	t.Helper()
+	gin.SetMode(gin.TestMode)
+	rec := httptest.NewRecorder()
+	c, _ := gin.CreateTestContext(rec)
+	blob, _ := json.Marshal(flow)
+	signed, err := h.Signer.SignBlob(blob, oidcFlowTTL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req := httptest.NewRequest(http.MethodGet,
+		"/api/v1/auth/oidc/callback?state="+queryState+"&code="+code, nil)
+	req.AddCookie(&http.Cookie{Name: oidcFlowCookie, Value: signed})
+	c.Request = req
+	h.Callback(c)
+	return rec
+}
+
+func sessionCookie(rec *httptest.ResponseRecorder) string {
+	for _, ck := range rec.Result().Cookies() {
+		if ck.Name == cookieName && ck.Value != "" && ck.MaxAge >= 0 {
+			return ck.Value
+		}
+	}
+	return ""
+}
+
+func TestCallback_KnownActiveUser_RoleFromDB(t *testing.T) {
+	users, pool, signer := oidcTestSetup(t)
+	seedUser(t, users, pool, "sso-viewer@test.local", "viewer", true)
+
+	h := NewOIDCHandler(nil, &mockAuth{claims: &oidcsvc.Claims{
+		Email: "sso-viewer@test.local", EmailVerified: true, Subject: "sub-1", Nonce: "N",
+	}}, users, signer, nil)
+
+	rec := runCallback(t, h, oidcFlow{State: "S", Verifier: "v", Nonce: "N"}, "S", "code")
+
+	if loc := rec.Header().Get("Location"); loc != "/dashboard" {
+		t.Fatalf("expected redirect to /dashboard, got %q (body proves failure path)", loc)
+	}
+	raw := sessionCookie(rec)
+	if raw == "" {
+		t.Fatal("expected a session cookie to be set")
+	}
+	tok, err := signer.Verify(raw)
+	if err != nil {
+		t.Fatalf("session token invalid: %v", err)
+	}
+	// Kernbeweis: Rolle kommt aus der DB-Row (viewer), nicht aus Claims.
+	if tok.Role != "viewer" {
+		t.Errorf("token role = %q, want viewer (role must come from DB)", tok.Role)
+	}
+	if tok.Actor != "sso-viewer@test.local" {
+		t.Errorf("token actor = %q", tok.Actor)
+	}
+}
+
+func TestCallback_UnknownEmail_Rejected(t *testing.T) {
+	users, pool, signer := oidcTestSetup(t)
+	_, _ = pool.Exec(context.Background(), `DELETE FROM users WHERE email=$1`, "ghost@test.local")
+
+	h := NewOIDCHandler(nil, &mockAuth{claims: &oidcsvc.Claims{
+		Email: "ghost@test.local", EmailVerified: true, Subject: "x", Nonce: "N",
+	}}, users, signer, nil)
+
+	rec := runCallback(t, h, oidcFlow{State: "S", Nonce: "N"}, "S", "code")
+	if !strings.Contains(rec.Header().Get("Location"), "sso_error=no_account") {
+		t.Fatalf("expected sso_error=no_account, got %q", rec.Header().Get("Location"))
+	}
+	if sessionCookie(rec) != "" {
+		t.Fatal("no session cookie expected for unknown user")
+	}
+}
+
+func TestCallback_InactiveUser_Rejected(t *testing.T) {
+	users, pool, signer := oidcTestSetup(t)
+	seedUser(t, users, pool, "sso-disabled@test.local", "admin", false)
+
+	h := NewOIDCHandler(nil, &mockAuth{claims: &oidcsvc.Claims{
+		Email: "sso-disabled@test.local", EmailVerified: true, Subject: "x", Nonce: "N",
+	}}, users, signer, nil)
+
+	rec := runCallback(t, h, oidcFlow{State: "S", Nonce: "N"}, "S", "code")
+	if !strings.Contains(rec.Header().Get("Location"), "sso_error=disabled") {
+		t.Fatalf("expected sso_error=disabled, got %q", rec.Header().Get("Location"))
+	}
+	if sessionCookie(rec) != "" {
+		t.Fatal("no session cookie expected for inactive user")
+	}
+}
+
+func TestCallback_EmailUnverified_Rejected(t *testing.T) {
+	users, pool, signer := oidcTestSetup(t)
+	seedUser(t, users, pool, "sso-unverified@test.local", "admin", true)
+
+	h := NewOIDCHandler(nil, &mockAuth{claims: &oidcsvc.Claims{
+		Email: "sso-unverified@test.local", EmailVerified: false, Subject: "x", Nonce: "N",
+	}}, users, signer, nil)
+
+	rec := runCallback(t, h, oidcFlow{State: "S", Nonce: "N"}, "S", "code")
+	if !strings.Contains(rec.Header().Get("Location"), "sso_error=unverified") {
+		t.Fatalf("expected sso_error=unverified, got %q", rec.Header().Get("Location"))
+	}
+	if sessionCookie(rec) != "" {
+		t.Fatal("no session cookie expected for unverified email")
+	}
+}
+
+func TestCallback_NonceMismatch_Rejected(t *testing.T) {
+	users, pool, signer := oidcTestSetup(t)
+	seedUser(t, users, pool, "sso-nonce@test.local", "admin", true)
+
+	h := NewOIDCHandler(nil, &mockAuth{claims: &oidcsvc.Claims{
+		Email: "sso-nonce@test.local", EmailVerified: true, Subject: "x", Nonce: "WRONG",
+	}}, users, signer, nil)
+
+	rec := runCallback(t, h, oidcFlow{State: "S", Nonce: "N"}, "S", "code")
+	if !strings.Contains(rec.Header().Get("Location"), "sso_error=nonce") {
+		t.Fatalf("expected sso_error=nonce, got %q", rec.Header().Get("Location"))
+	}
+}
+
+func TestCallback_StateMismatch_Rejected(t *testing.T) {
+	users, _, signer := oidcTestSetup(t)
+	h := NewOIDCHandler(nil, &mockAuth{claims: &oidcsvc.Claims{}}, users, signer, nil)
+
+	rec := runCallback(t, h, oidcFlow{State: "S", Nonce: "N"}, "WRONG", "code")
+	if !strings.Contains(rec.Header().Get("Location"), "sso_error=state") {
+		t.Fatalf("expected sso_error=state, got %q", rec.Header().Get("Location"))
+	}
+}
--- a/internal/models/oidc_settings.go
+++ b/internal/models/oidc_settings.go
@@ -0,0 +1,21 @@
+package models
+
+import "time"
+
+// OIDCSettings ist die Singleton-Konfiguration für OIDC/Keycloak-SSO.
+// ClientSecretEnc trägt den verschlüsselten Client-Secret (secrets.Box)
+// und wird NIE serialisiert (json:"-").
+type OIDCSettings struct {
+	ID              int       `gorm:"column:id;primaryKey"        json:"id"`
+	Enabled         bool      `gorm:"column:enabled"              json:"enabled"`
+	IssuerURL       string    `gorm:"column:issuer_url"           json:"issuer_url"`
+	ClientID        string    `gorm:"column:client_id"            json:"client_id"`
+	ClientSecretEnc []byte    `gorm:"column:client_secret_enc"    json:"-"`
+	Scopes          string    `gorm:"column:scopes"               json:"scopes"`
+	EmailClaim      string    `gorm:"column:email_claim"          json:"email_claim"`
+	ButtonLabel     string    `gorm:"column:button_label"         json:"button_label"`
+	CreatedAt       time.Time `gorm:"column:created_at"           json:"created_at"`
+	UpdatedAt       time.Time `gorm:"column:updated_at"           json:"updated_at"`
+}
+
+func (OIDCSettings) TableName() string { return "oidc_settings" }
--- a/internal/services/oidc/client.go
+++ b/internal/services/oidc/client.go
@@ -0,0 +1,181 @@
+package oidc
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+
+	gooidc "github.com/coreos/go-oidc/v3/oidc"
+	"golang.org/x/oauth2"
+)
+
+// Claims sind die aus dem ID-Token extrahierten Felder, die der Login-
+// Flow braucht. Bewusst minimal — Rolle kommt NIE aus dem Token.
+type Claims struct {
+	Subject       string
+	Email         string
+	EmailVerified bool
+	Nonce         string
+}
+
+// Authenticator ist der testbare Seam: Aufbau der Auth-URL und der
+// Code-Exchange inkl. ID-Token-Verifikation + Claim-Extraktion. Der
+// Handler hängt nur hieran, sodass Tests einen Fake injizieren können.
+type Authenticator interface {
+	// AuthCodeURL baut die Redirect-URL zum IdP (state + nonce + PKCE-Challenge).
+	AuthCodeURL(ctx context.Context, redirectURI, state, nonce, pkceVerifier string) (string, error)
+	// Exchange tauscht den Code (PKCE), verifiziert das ID-Token und gibt
+	// die Claims zurück. Prüft Issuer/Audience/Signatur/Expiry.
+	Exchange(ctx context.Context, redirectURI, code, pkceVerifier string) (*Claims, error)
+}
+
+// Client implementiert Authenticator gegen einen echten OIDC-Provider.
+// Provider+Verifier werden lazy aufgebaut und gecached; bei geänderten
+// Settings (Fingerprint) neu aufgebaut.
+type Client struct {
+	repo *Repo
+
+	mu       sync.Mutex
+	cacheKey string
+	provider *gooidc.Provider
+	verifier *gooidc.IDTokenVerifier
+}
+
+func NewClient(repo *Repo) *Client { return &Client{repo: repo} }
+
+// loaded baut (oder reused) Provider+Verifier aus den aktuellen Settings.
+// Cache-Key = Fingerprint(issuer, client_id, scopes); Rebuild bei Änderung.
+func (c *Client) loaded(ctx context.Context) (*gooidc.Provider, *gooidc.IDTokenVerifier, error) {
+	s, err := c.repo.Get(ctx)
+	if err != nil {
+		return nil, nil, err
+	}
+	if !s.Enabled {
+		return nil, nil, ErrDisabled
+	}
+	if strings.TrimSpace(s.IssuerURL) == "" || strings.TrimSpace(s.ClientID) == "" {
+		return nil, nil, fmt.Errorf("oidc: issuer_url and client_id required")
+	}
+	key := fingerprint(s.IssuerURL, s.ClientID, s.Scopes)
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.provider == nil || c.cacheKey != key {
+		prov, err := gooidc.NewProvider(ctx, s.IssuerURL)
+		if err != nil {
+			return nil, nil, fmt.Errorf("oidc: discovery: %w", err)
+		}
+		c.provider = prov
+		c.verifier = prov.Verifier(&gooidc.Config{ClientID: s.ClientID})
+		c.cacheKey = key
+	}
+	return c.provider, c.verifier, nil
+}
+
+func (c *Client) oauthConfig(prov *gooidc.Provider, clientID, secret, redirectURI, scopes string) oauth2.Config {
+	return oauth2.Config{
+		ClientID:     clientID,
+		ClientSecret: secret,
+		Endpoint:     prov.Endpoint(),
+		RedirectURL:  redirectURI,
+		Scopes:       splitScopes(scopes),
+	}
+}
+
+// AuthCodeURL implementiert Authenticator.
+func (c *Client) AuthCodeURL(ctx context.Context, redirectURI, state, nonce, pkceVerifier string) (string, error) {
+	s, err := c.repo.Get(ctx)
+	if err != nil {
+		return "", err
+	}
+	prov, _, err := c.loaded(ctx)
+	if err != nil {
+		return "", err
+	}
+	secret, _ := c.repo.ClientSecret(ctx)
+	cfg := c.oauthConfig(prov, s.ClientID, secret, redirectURI, s.Scopes)
+	return cfg.AuthCodeURL(state,
+		gooidc.Nonce(nonce),
+		oauth2.S256ChallengeOption(pkceVerifier),
+	), nil
+}
+
+// Exchange implementiert Authenticator.
+func (c *Client) Exchange(ctx context.Context, redirectURI, code, pkceVerifier string) (*Claims, error) {
+	s, err := c.repo.Get(ctx)
+	if err != nil {
+		return nil, err
+	}
+	prov, verifier, err := c.loaded(ctx)
+	if err != nil {
+		return nil, err
+	}
+	secret, _ := c.repo.ClientSecret(ctx)
+	cfg := c.oauthConfig(prov, s.ClientID, secret, redirectURI, s.Scopes)
+
+	tok, err := cfg.Exchange(ctx, code, oauth2.VerifierOption(pkceVerifier))
+	if err != nil {
+		return nil, fmt.Errorf("oidc: code exchange: %w", err)
+	}
+	rawID, ok := tok.Extra("id_token").(string)
+	if !ok || rawID == "" {
+		return nil, errors.New("oidc: no id_token in response")
+	}
+	idToken, err := verifier.Verify(ctx, rawID)
+	if err != nil {
+		return nil, fmt.Errorf("oidc: id_token verify: %w", err)
+	}
+	return extractClaims(idToken, s.EmailClaim)
+}
+
+// extractClaims liest E-Mail (via konfigurierbarem Claim), email_verified,
+// sub und nonce aus dem verifizierten ID-Token.
+func extractClaims(idToken *gooidc.IDToken, emailClaim string) (*Claims, error) {
+	var raw map[string]any
+	if err := idToken.Claims(&raw); err != nil {
+		return nil, fmt.Errorf("oidc: decode claims: %w", err)
+	}
+	if emailClaim == "" {
+		emailClaim = "email"
+	}
+	out := &Claims{Subject: idToken.Subject}
+	if v, ok := raw[emailClaim].(string); ok {
+		out.Email = strings.TrimSpace(strings.ToLower(v))
+	}
+	// email_verified kann bool oder "true"/"false" sein.
+	switch ev := raw["email_verified"].(type) {
+	case bool:
+		out.EmailVerified = ev
+	case string:
+		out.EmailVerified = ev == "true"
+	}
+	if n, ok := raw["nonce"].(string); ok {
+		out.Nonce = n
+	}
+	return out, nil
+}
+
+func splitScopes(s string) []string {
+	out := []string{}
+	for _, p := range strings.Fields(s) {
+		if p != "" {
+			out = append(out, p)
+		}
+	}
+	if len(out) == 0 {
+		out = []string{gooidc.ScopeOpenID, "email", "profile"}
+	}
+	return out
+}
+
+func fingerprint(parts ...string) string {
+	h := sha256.New()
+	for _, p := range parts {
+		h.Write([]byte(p))
+		h.Write([]byte{0})
+	}
+	return hex.EncodeToString(h.Sum(nil))
+}
--- a/internal/services/oidc/settings.go
+++ b/internal/services/oidc/settings.go
@@ -0,0 +1,111 @@
+// Package oidc kapselt die OIDC/Keycloak-SSO-Konfiguration (Singleton-
+// Settings + verschlüsseltes Client-Secret) und einen lazy aufgebauten
+// OIDC-Provider/Verifier. Login-Flow-State ist stateless (signiertes
+// Cookie im Handler), daher hält dieses Paket keinen Request-State.
+package oidc
+
+import (
+	"context"
+	"errors"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+
+	"git.netcell-it.de/projekte/edgeguard-native/internal/models"
+	"git.netcell-it.de/projekte/edgeguard-native/internal/services/secrets"
+)
+
+// ErrDisabled signalisiert, dass OIDC nicht aktiviert/konfiguriert ist.
+var ErrDisabled = errors.New("oidc: not enabled")
+
+// Repo liest/schreibt die oidc_settings-Singleton-Row und ver-/entschlüsselt
+// das Client-Secret via secrets.Box.
+type Repo struct {
+	pool *pgxpool.Pool
+	box  *secrets.Box
+}
+
+func New(pool *pgxpool.Pool, box *secrets.Box) *Repo {
+	return &Repo{pool: pool, box: box}
+}
+
+// Get liefert die Settings (client_secret_enc als Bytes, NULL → nil).
+func (r *Repo) Get(ctx context.Context) (*models.OIDCSettings, error) {
+	var s models.OIDCSettings
+	if err := r.pool.QueryRow(ctx, `
+SELECT id, enabled, issuer_url, client_id, client_secret_enc,
+       scopes, email_claim, button_label, created_at, updated_at
+FROM oidc_settings WHERE id = 1`).Scan(
+		&s.ID, &s.Enabled, &s.IssuerURL, &s.ClientID, &s.ClientSecretEnc,
+		&s.Scopes, &s.EmailClaim, &s.ButtonLabel, &s.CreatedAt, &s.UpdatedAt,
+	); err != nil {
+		return nil, err
+	}
+	return &s, nil
+}
+
+// ClientSecret entschlüsselt das gespeicherte Client-Secret ("" wenn keins).
+func (r *Repo) ClientSecret(ctx context.Context) (string, error) {
+	s, err := r.Get(ctx)
+	if err != nil {
+		return "", err
+	}
+	if len(s.ClientSecretEnc) == 0 {
+		return "", nil
+	}
+	pt, err := r.box.Open(s.ClientSecretEnc)
+	if err != nil {
+		return "", err
+	}
+	return string(pt), nil
+}
+
+// HasSecret meldet, ob ein Client-Secret hinterlegt ist (für die Admin-UI,
+// ohne das Secret selbst preiszugeben).
+func (r *Repo) HasSecret(ctx context.Context) (bool, error) {
+	var present bool
+	err := r.pool.QueryRow(ctx,
+		`SELECT client_secret_enc IS NOT NULL FROM oidc_settings WHERE id = 1`).Scan(&present)
+	return present, err
+}
+
+// UpdateInput beschreibt eine Settings-Änderung. ClientSecret nutzt
+// write-only-Semantik: nil = unverändert, "" = löschen, sonst neu sealen.
+type UpdateInput struct {
+	Enabled      bool
+	IssuerURL    string
+	ClientID     string
+	Scopes       string
+	EmailClaim   string
+	ButtonLabel  string
+	ClientSecret *string
+}
+
+// Update schreibt die Settings. Das Secret wird nur angefasst, wenn
+// ClientSecret != nil.
+func (r *Repo) Update(ctx context.Context, in UpdateInput) error {
+	if in.ClientSecret == nil {
+		_, err := r.pool.Exec(ctx, `
+UPDATE oidc_settings
+   SET enabled=$1, issuer_url=$2, client_id=$3, scopes=$4,
+       email_claim=$5, button_label=$6, updated_at=NOW()
+ WHERE id=1`,
+			in.Enabled, in.IssuerURL, in.ClientID, in.Scopes, in.EmailClaim, in.ButtonLabel)
+		return err
+	}
+
+	var enc []byte
+	if *in.ClientSecret != "" {
+		sealed, err := r.box.Seal([]byte(*in.ClientSecret))
+		if err != nil {
+			return err
+		}
+		enc = sealed
+	}
+	_, err := r.pool.Exec(ctx, `
+UPDATE oidc_settings
+   SET enabled=$1, issuer_url=$2, client_id=$3, scopes=$4,
+       email_claim=$5, button_label=$6, client_secret_enc=$7, updated_at=NOW()
+ WHERE id=1`,
+		in.Enabled, in.IssuerURL, in.ClientID, in.Scopes, in.EmailClaim, in.ButtonLabel, enc)
+	return err
+}
--- a/internal/services/oidc/settings_test.go
+++ b/internal/services/oidc/settings_test.go
@@ -0,0 +1,90 @@
+package oidc
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"git.netcell-it.de/projekte/edgeguard-native/internal/database"
+	"git.netcell-it.de/projekte/edgeguard-native/internal/services/secrets"
+)
+
+// migrateRetry umgeht die goose-Erst-Apply-Race, wenn mehrere guarded
+// Test-Pakete dieselbe frische DB parallel migrieren.
+func migrateRetry(ctx context.Context, dsn string) error {
+	var err error
+	for i := 0; i < 3; i++ {
+		if err = database.Migrate(ctx, dsn); err == nil {
+			return nil
+		}
+		time.Sleep(700 * time.Millisecond)
+	}
+	return err
+}
+
+// Guarded integration test: set EG_FWTEST_DSN (sonst skip).
+func testRepo(t *testing.T) *Repo {
+	t.Helper()
+	dsn := os.Getenv("EG_FWTEST_DSN")
+	if dsn == "" {
+		t.Skip("set EG_FWTEST_DSN to run the oidc settings test")
+	}
+	ctx := context.Background()
+	if err := migrateRetry(ctx, dsn); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	pool, err := database.Open(ctx, dsn)
+	if err != nil {
+		t.Fatalf("open: %v", err)
+	}
+	t.Cleanup(pool.Close)
+	box := secrets.New(t.TempDir() + "/master_key")
+	// Settings auf einen sauberen Default zurücksetzen.
+	if _, err := pool.Exec(ctx, `UPDATE oidc_settings SET enabled=false, issuer_url='', client_id='', client_secret_enc=NULL WHERE id=1`); err != nil {
+		t.Fatalf("reset: %v", err)
+	}
+	return New(pool, box)
+}
+
+func TestSettings_SecretWriteOnly(t *testing.T) {
+	r := testRepo(t)
+	ctx := context.Background()
+	str := func(s string) *string { return &s }
+
+	// 1) Neues Secret setzen.
+	if err := r.Update(ctx, UpdateInput{Enabled: true, IssuerURL: "https://idp.example/realms/x", ClientID: "eg", ClientSecret: str("s3cr3t")}); err != nil {
+		t.Fatal(err)
+	}
+	if has, _ := r.HasSecret(ctx); !has {
+		t.Fatal("HasSecret should be true after setting a secret")
+	}
+	got, err := r.ClientSecret(ctx)
+	if err != nil || got != "s3cr3t" {
+		t.Fatalf("ClientSecret = %q, %v; want s3cr3t", got, err)
+	}
+
+	// 2) Update mit nil → Secret bleibt unverändert.
+	if err := r.Update(ctx, UpdateInput{Enabled: true, IssuerURL: "https://idp.example/realms/x", ClientID: "eg2", ClientSecret: nil}); err != nil {
+		t.Fatal(err)
+	}
+	got, _ = r.ClientSecret(ctx)
+	if got != "s3cr3t" {
+		t.Fatalf("secret should be preserved on nil update, got %q", got)
+	}
+	if s, _ := r.Get(ctx); s.ClientID != "eg2" {
+		t.Fatalf("client_id should update to eg2, got %q", s.ClientID)
+	}
+
+	// 3) Update mit "" → Secret gelöscht.
+	if err := r.Update(ctx, UpdateInput{Enabled: false, IssuerURL: "", ClientID: "", ClientSecret: str("")}); err != nil {
+		t.Fatal(err)
+	}
+	if has, _ := r.HasSecret(ctx); has {
+		t.Fatal("HasSecret should be false after clearing the secret")
+	}
+	got, _ = r.ClientSecret(ctx)
+	if got != "" {
+		t.Fatalf("secret should be empty after clear, got %q", got)
+	}
+}
--- a/internal/services/session/session.go
+++ b/internal/services/session/session.go
@@ -174,3 +174,67 @@ var (
 	ErrInvalidToken = errors.New("invalid session token")
 	ErrExpiredToken = errors.New("session token expired")
 )
+
+// blobEnvelope umhüllt eine beliebige Payload mit einem Ablaufzeitpunkt.
+type blobEnvelope struct {
+	Exp     int64  `json:"exp"`
+	Payload []byte `json:"p"`
+}
+
+// SignBlob signiert beliebige Bytes mit dem Session-Secret (HMAC-SHA256,
+// gleiches Format wie Tokens: base64url(json).base64url(sig)) und einer
+// TTL. Für stateless, cluster-sichere Kurzzeit-Cookies (z.B. der
+// OIDC-Flow-State). Das Secret ist clusterweit synchron (.jwt_fingerprint).
+func (s *Signer) SignBlob(payload []byte, ttl time.Duration) (string, error) {
+	env := blobEnvelope{
+		Exp:     s.Now().Add(ttl).Unix(),
+		Payload: payload,
+	}
+	data, err := json.Marshal(env)
+	if err != nil {
+		return "", err
+	}
+	mac := hmac.New(sha256.New, s.Secret)
+	mac.Write(data)
+	return base64.RawURLEncoding.EncodeToString(data) + "." +
+		base64.RawURLEncoding.EncodeToString(mac.Sum(nil)), nil
+}
+
+// VerifyBlob prüft Signatur + Ablauf und gibt die ursprüngliche Payload
+// zurück. ErrInvalidToken / ErrExpiredToken bei Fehlern.
+func (s *Signer) VerifyBlob(raw string) ([]byte, error) {
+	if raw == "" {
+		return nil, ErrInvalidToken
+	}
+	dot := -1
+	for i := 0; i < len(raw); i++ {
+		if raw[i] == '.' {
+			dot = i
+			break
+		}
+	}
+	if dot <= 0 || dot >= len(raw)-1 {
+		return nil, ErrInvalidToken
+	}
+	payload, err := base64.RawURLEncoding.DecodeString(raw[:dot])
+	if err != nil {
+		return nil, ErrInvalidToken
+	}
+	sig, err := base64.RawURLEncoding.DecodeString(raw[dot+1:])
+	if err != nil {
+		return nil, ErrInvalidToken
+	}
+	mac := hmac.New(sha256.New, s.Secret)
+	mac.Write(payload)
+	if subtle.ConstantTimeCompare(mac.Sum(nil), sig) != 1 {
+		return nil, ErrInvalidToken
+	}
+	var env blobEnvelope
+	if err := json.Unmarshal(payload, &env); err != nil {
+		return nil, ErrInvalidToken
+	}
+	if s.Now().Unix() >= env.Exp {
+		return nil, ErrExpiredToken
+	}
+	return env.Payload, nil
+}
--- a/internal/services/users/users.go
+++ b/internal/services/users/users.go
@@ -240,6 +240,21 @@ func (r *Repo) RecordLogin(ctx context.Context, id int64) {
 	_, _ = r.pool.Exec(ctx, `UPDATE users SET last_login_at=NOW() WHERE id=$1`, id)
 }

+// GetOIDCSubject liefert den gespeicherten OIDC-'sub' des Users ("" wenn
+// noch nicht verknüpft).
+func (r *Repo) GetOIDCSubject(ctx context.Context, id int64) (string, error) {
+	var sub string
+	err := r.pool.QueryRow(ctx, `SELECT COALESCE(oidc_subject, '') FROM users WHERE id=$1`, id).Scan(&sub)
+	return sub, err
+}
+
+// SetOIDCSubject speichert den OIDC-'sub' beim ersten erfolgreichen
+// SSO-Login (opportunistisches Linking).
+func (r *Repo) SetOIDCSubject(ctx context.Context, id int64, sub string) error {
+	_, err := r.pool.Exec(ctx, `UPDATE users SET oidc_subject=$1, updated_at=NOW() WHERE id=$2`, sub, id)
+	return err
+}
+
 // VerifyPassword is a constant-time bcrypt compare.
 func VerifyPassword(hash, password string) bool {
 	return bcrypt.CompareHashAndPassword([]byte(hash), []byte(password)) == nil
--- a/management-ui/src/App.tsx
+++ b/management-ui/src/App.tsx
@@ -1,4 +1,4 @@
-import { Suspense, lazy, useEffect, type ReactNode } from 'react'
+import { Suspense, lazy, useEffect, useState, type ReactNode } from 'react'
 import { BrowserRouter, Navigate, Route, Routes, useLocation } from 'react-router-dom'
 import ErrorBoundary from './components/ErrorBoundary'
 import { ConfigProvider, Spin } from 'antd'
@@ -79,11 +79,37 @@ const antdTheme = {

 function RequireAuth({ children }: { children: ReactNode }) {
  const user = useAuthStore((s) => s.user)
+  const setUser = useAuthStore((s) => s.set)
  const location = useLocation()
-  if (!user) {
-    return <Navigate to="/login" replace state={{ from: location }} />
+  // Wenn kein Store-User da ist (z.B. direkt nach SSO-Callback: Cookie
+  // gesetzt, sessionStorage leer — oder Hard-Refresh), einmal /auth/me
+  // probieren, bevor wir nach /login umleiten.
+  const [checking, setChecking] = useState(user === null)
+
+  useEffect(() => {
+    if (user !== null) {
+      setChecking(false)
+      return
+    }
+    let cancelled = false
+    apiClient.get('/auth/me')
+      .then((r) => {
+        if (!cancelled && isEnvelope(r.data)) setUser(r.data.data as SessionUser)
+      })
+      .catch(() => { /* 401 → Interceptor leitet auf /login */ })
+      .finally(() => { if (!cancelled) setChecking(false) })
+    return () => { cancelled = true }
+  }, [user, setUser])
+
+  if (user) return <>{children}</>
+  if (checking) {
+    return (
+      <div style={{ minHeight: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
+        <Spin size="large" />
+      </div>
+    )
  }
-  return <>{children}</>
+  return <Navigate to="/login" replace state={{ from: location }} />
 }

 function SetupGate({ children }: { children: ReactNode }) {
--- a/management-ui/src/i18n/locales/de/common.json
+++ b/management-ui/src/i18n/locales/de/common.json
@@ -289,6 +289,24 @@
    "forgotPassword": "Passwort vergessen?",
    "viewerBadge": "Nur lesen",
    "viewerHint": "Dieser Account hat die Rolle Betrachter — Änderungen sind gesperrt. Ein Admin kann die Rolle anpassen.",
+    "sso": {
+      "login": "Mit SSO anmelden",
+      "err": {
+        "no_account": "Kein EdgeGuard-Konto für diese E-Mail. Bitte wende dich an einen Administrator.",
+        "disabled": "Dieses Konto ist deaktiviert.",
+        "unverified": "Die E-Mail-Adresse ist beim Identity-Provider nicht verifiziert.",
+        "state": "Sicherheitsprüfung fehlgeschlagen (State). Bitte erneut versuchen.",
+        "nonce": "Sicherheitsprüfung fehlgeschlagen (Nonce). Bitte erneut versuchen.",
+        "token": "Das Token vom Identity-Provider konnte nicht verifiziert werden.",
+        "exchange": "Code-Austausch mit dem Identity-Provider fehlgeschlagen.",
+        "expired": "Die Anmeldesitzung ist abgelaufen. Bitte erneut versuchen.",
+        "denied": "Anmeldung beim Identity-Provider abgebrochen.",
+        "subject_mismatch": "Die Identität passt nicht zum hinterlegten Konto.",
+        "config": "SSO ist nicht korrekt konfiguriert.",
+        "server": "Interner Fehler bei der SSO-Anmeldung.",
+        "generic": "SSO-Anmeldung fehlgeschlagen."
+      }
+    },
    "totp": {
      "prompt": "Bitte gib den 6-stelligen Code aus deiner Authenticator-App ein.",
      "verify": "Code bestätigen",
@@ -907,6 +925,24 @@
    "configPreviewBtn": "Vorschau laden",
    "configPreviewHint": "Rendert die gewählte Service-Config aus dem aktuellen DB-State. Nur Lesezugriff — es wird nichts auf Disk geschrieben oder neu geladen.",
    "configCopied": "Config in Zwischenablage kopiert",
+    "oidc": {
+      "title": "Single Sign-On (OIDC)",
+      "intro": "SSO-Login per OpenID Connect (z. B. Keycloak), zusätzlich zum lokalen Login. Anmeldung gelingt nur für bereits angelegte Benutzer; die Rolle wird in EdgeGuard verwaltet.",
+      "enabled": "SSO aktiviert",
+      "issuerUrl": "Issuer-URL",
+      "issuerHint": "Basis-URL des Realms, z. B. https://keycloak.example.com/realms/edgeguard",
+      "clientId": "Client-ID",
+      "clientSecret": "Client-Secret",
+      "secretSet": "Gespeichert — leer lassen, um es unverändert zu lassen.",
+      "secretUnset": "Noch kein Secret gespeichert.",
+      "scopes": "Scopes",
+      "emailClaim": "E-Mail-Claim",
+      "buttonLabel": "Button-Beschriftung",
+      "redirectUri": "Redirect-URI",
+      "redirectHint": "Diese URL im Keycloak-Client als gültige Redirect-URI eintragen (pro Cluster-Node die jeweilige FQDN).",
+      "saved": "OIDC-Einstellungen gespeichert",
+      "saveFailed": "Speichern der OIDC-Einstellungen fehlgeschlagen"
+    },
    "passwordCardTitle": "Admin-Passwort ändern",
    "currentPassword": "Aktuelles Passwort",
    "newPassword": "Neues Passwort",
@@ -1287,6 +1323,7 @@
  "common": {
    "yes": "Ja",
    "no": "Nein",
+    "or": "oder",
    "save": "Speichern",
    "cancel": "Abbrechen",
    "loading": "Lädt …",
--- a/management-ui/src/i18n/locales/en/common.json
+++ b/management-ui/src/i18n/locales/en/common.json
@@ -289,6 +289,24 @@
    "forgotPassword": "Forgot your password?",
    "viewerBadge": "Read-only",
    "viewerHint": "Your account has viewer role — all changes are blocked. Contact an admin to change your role.",
+    "sso": {
+      "login": "Sign in with SSO",
+      "err": {
+        "no_account": "No EdgeGuard account for this email. Please contact an administrator.",
+        "disabled": "This account is disabled.",
+        "unverified": "The email address is not verified at the identity provider.",
+        "state": "Security check failed (state). Please try again.",
+        "nonce": "Security check failed (nonce). Please try again.",
+        "token": "Could not verify the token from the identity provider.",
+        "exchange": "Code exchange with the identity provider failed.",
+        "expired": "The sign-in session expired. Please try again.",
+        "denied": "Sign-in at the identity provider was cancelled.",
+        "subject_mismatch": "The identity does not match the linked account.",
+        "config": "SSO is not configured correctly.",
+        "server": "Internal error during SSO sign-in.",
+        "generic": "SSO sign-in failed."
+      }
+    },
    "totp": {
      "prompt": "Enter the 6-digit code from your authenticator app.",
      "verify": "Verify code",
@@ -907,6 +925,24 @@
    "configPreviewBtn": "Load preview",
    "configPreviewHint": "Renders the selected service config from the current DB state. Read-only — nothing is written to disk or reloaded.",
    "configCopied": "Config copied to clipboard",
+    "oidc": {
+      "title": "Single Sign-On (OIDC)",
+      "intro": "SSO login via OpenID Connect (e.g. Keycloak), in addition to local login. Only existing users can sign in; the role is managed in EdgeGuard.",
+      "enabled": "SSO enabled",
+      "issuerUrl": "Issuer URL",
+      "issuerHint": "Realm base URL, e.g. https://keycloak.example.com/realms/edgeguard",
+      "clientId": "Client ID",
+      "clientSecret": "Client secret",
+      "secretSet": "Stored — leave empty to keep unchanged.",
+      "secretUnset": "No secret stored yet.",
+      "scopes": "Scopes",
+      "emailClaim": "Email claim",
+      "buttonLabel": "Button label",
+      "redirectUri": "Redirect URI",
+      "redirectHint": "Register this URL as a valid redirect URI in the Keycloak client (per cluster node its own FQDN).",
+      "saved": "OIDC settings saved",
+      "saveFailed": "Failed to save OIDC settings"
+    },
    "passwordCardTitle": "Change admin password",
    "currentPassword": "Current password",
    "newPassword": "New password",
@@ -1287,6 +1323,7 @@
  "common": {
    "yes": "Yes",
    "no": "No",
+    "or": "or",
    "save": "Save",
    "cancel": "Cancel",
    "loading": "Loading …",
--- a/management-ui/src/pages/Login/index.tsx
+++ b/management-ui/src/pages/Login/index.tsx
@@ -1,6 +1,6 @@
-import { useState } from 'react'
-import { Button, Card, Form, Input, message, Typography } from 'antd'
-import { KeyOutlined } from '@ant-design/icons'
+import { useEffect, useState } from 'react'
+import { Button, Card, Divider, Form, Input, message, Typography } from 'antd'
+import { KeyOutlined, LoginOutlined } from '@ant-design/icons'
 import { Link, useNavigate } from 'react-router-dom'
 import { useTranslation } from 'react-i18next'

@@ -22,6 +22,28 @@ export default function LoginPage({ onLogin }: Props) {
  const [totpRequired, setTotpRequired] = useState(false)
  const [totpCode, setTotpCode] = useState('')
  const [verifying, setVerifying] = useState(false)
+  const [ssoEnabled, setSsoEnabled] = useState(false)
+  const [ssoLabel, setSsoLabel] = useState('')
+
+  // SSO-Verfügbarkeit prüfen + evtl. ?sso_error vom Callback anzeigen.
+  useEffect(() => {
+    apiClient.get('/auth/oidc/settings')
+      .then((r) => {
+        if (!isEnvelope(r.data)) return
+        const d = r.data.data as { enabled?: boolean; button_label?: string }
+        setSsoEnabled(!!d.enabled)
+        setSsoLabel(d.button_label || '')
+      })
+      .catch(() => { /* SSO optional */ })
+
+    const reason = new URLSearchParams(window.location.search).get('sso_error')
+    if (reason) {
+      const key = `auth.sso.err.${reason}`
+      const txt = t(key)
+      message.error(txt === key ? t('auth.sso.err.generic') : txt)
+      window.history.replaceState({}, '', window.location.pathname)
+    }
+  }, [t])

  const onFinish = async (vals: LoginValues) => {
    try {
@@ -106,6 +128,20 @@ export default function LoginPage({ onLogin }: Props) {
          </div>
        )}

+        {!totpRequired && ssoEnabled && (
+          <>
+            <Divider plain style={{ fontSize: 12, color: '#94a3b8' }}>{t('common.or')}</Divider>
+            <Button
+              block
+              icon={<LoginOutlined />}
+              style={{ marginBottom: 12 }}
+              onClick={() => { window.location.href = '/api/v1/auth/oidc/login' }}
+            >
+              {ssoLabel || t('auth.sso.login')}
+            </Button>
+          </>
+        )}
+
        {!totpRequired && (
          <div style={{ textAlign: 'center', fontSize: 12 }}>
            <Link to="/reset-password">{t('auth.forgotPassword')}</Link>
--- a/management-ui/src/pages/Settings/index.tsx
+++ b/management-ui/src/pages/Settings/index.tsx
@@ -46,6 +46,27 @@ interface VIPSettingsValues {
  gw_check_ip?: string
 }

+interface OIDCSettingsView {
+  enabled: boolean
+  issuer_url: string
+  client_id: string
+  scopes: string
+  email_claim: string
+  button_label: string
+  secret_configured: boolean
+  redirect_uri: string
+}
+
+interface OIDCFormValues {
+  enabled: boolean
+  issuer_url: string
+  client_id: string
+  client_secret?: string
+  scopes: string
+  email_claim: string
+  button_label: string
+}
+
 export default function SettingsPage() {
  const { t } = useTranslation()
  const qc = useQueryClient()
@@ -93,6 +114,41 @@ export default function SettingsPage() {
    onError: (e: Error) => msg.error(t('cluster.vipCard.saveFailed') + ': ' + e.message),
  })

+  const [oidcForm] = Form.useForm<OIDCFormValues>()
+  const { data: oidc } = useQuery({
+    queryKey: ['oidc', 'settings'],
+    queryFn: async () => {
+      const r = await apiClient.get('/oidc/settings')
+      return isEnvelope(r.data) ? r.data.data as OIDCSettingsView : null
+    },
+  })
+  useEffect(() => {
+    if (oidc) {
+      oidcForm.setFieldsValue({
+        enabled: oidc.enabled,
+        issuer_url: oidc.issuer_url,
+        client_id: oidc.client_id,
+        scopes: oidc.scopes,
+        email_claim: oidc.email_claim,
+        button_label: oidc.button_label,
+        client_secret: '',
+      })
+    }
+  }, [oidc, oidcForm])
+  const updateOIDC = useMutation({
+    mutationFn: async (v: OIDCFormValues) => {
+      const body: Record<string, unknown> = { ...v }
+      // leeres Secret = unverändert → Feld weglassen (Backend: nil)
+      if (!v.client_secret) delete body.client_secret
+      return apiClient.put('/oidc/settings', body)
+    },
+    onSuccess: () => {
+      msg.success(t('settings.oidc.saved'))
+      void qc.invalidateQueries({ queryKey: ['oidc', 'settings'] })
+    },
+    onError: (e: Error) => msg.error(t('settings.oidc.saveFailed') + ': ' + e.message),
+  })
+
  const [emailForm] = Form.useForm<ContactEmailValues>()
  const updateEmails = useMutation({
    mutationFn: async (v: ContactEmailValues) => {
@@ -879,6 +935,49 @@ export default function SettingsPage() {
        </Form>
      </Card>

+      <Card title={<><GlobalOutlined /> {t('settings.oidc.title')}</>} className="mb-12" size="small">
+        <Typography.Paragraph type="secondary" style={{ marginBottom: 12 }}>
+          {t('settings.oidc.intro')}
+        </Typography.Paragraph>
+        <Form<OIDCFormValues> form={oidcForm} layout="vertical" onFinish={(v) => updateOIDC.mutate(v)}>
+          <Form.Item label={t('settings.oidc.enabled')} name="enabled" valuePropName="checked">
+            <Switch disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.issuerUrl')} name="issuer_url" extra={t('settings.oidc.issuerHint')}>
+            <Input placeholder="https://keycloak.example.com/realms/edgeguard" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.clientId')} name="client_id">
+            <Input disabled={isViewer} />
+          </Form.Item>
+          <Form.Item
+            label={t('settings.oidc.clientSecret')}
+            name="client_secret"
+            extra={oidc?.secret_configured ? t('settings.oidc.secretSet') : t('settings.oidc.secretUnset')}
+          >
+            <Input.Password placeholder={oidc?.secret_configured ? '••••••••' : ''} autoComplete="new-password" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.scopes')} name="scopes">
+            <Input placeholder="openid email profile" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.emailClaim')} name="email_claim">
+            <Input placeholder="email" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.buttonLabel')} name="button_label">
+            <Input disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.redirectUri')} extra={t('settings.oidc.redirectHint')}>
+            <Typography.Text copyable code style={{ fontSize: 12 }}>{oidc?.redirect_uri || ''}</Typography.Text>
+          </Form.Item>
+          <Form.Item style={{ marginBottom: 0 }}>
+            <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
+              <Button type="primary" htmlType="submit" loading={updateOIDC.isPending} disabled={isViewer}>
+                {t('common.save')}
+              </Button>
+            </Tooltip>
+          </Form.Item>
+        </Form>
+      </Card>
+
      <Card title={<><LockOutlined /> {t('settings.passwordCardTitle')}</>} size="small">
        <Form<ChangePasswordValues>
          form={pwForm}
Author	SHA1	Message	Date
Debian	3a707e2e3f	feat(auth): OIDC/Keycloak SSO-Login (additiv) — v1.2.91 SSO per OpenID Connect (Authorization Code + PKCE) zusätzlich zum lokalen Login. - Regeln: kein Auto-Provisioning (E-Mail muss als User existieren), Rolle aus DB (nie aus Token), lokaler Login+TOTP unangetastet. - Migration 0040: oidc_settings (Singleton, client_secret_enc via secrets.Box) + users.oidc_subject. - internal/services/oidc: Settings-Repo (write-only Secret) + lazy go-oidc Client (testbarer Authenticator-Seam). - internal/handlers/oidc.go: GET/PUT /oidc/settings (admin), GET /auth/oidc/{settings,login,callback}. Flow-State (state/PKCE/nonce) stateless im 5-min signierten HttpOnly-Cookie (SameSite=Lax). email_verified erzwungen, opportunistisches sub-Linking, Session via setSessionCookie+Signer. - session.SignBlob/VerifyBlob; users.Get/SetOIDCSubject; main.go-Wiring. - Frontend: App.tsx /auth/me-Bootstrap (für Cookie-Session nach Callback), Login-SSO-Button + sso_error, Settings OIDC-Card, i18n de/en. - Tests (guarded EG_FWTEST_DSN): Secret-Roundtrip + Callback (Rolle-aus-DB, no_account, disabled, unverified, nonce, state). Deps: go-oidc/v3, x/oauth2. Scope v1: nur Login (kein SLO/Refresh). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-06-05 16:04:13 +02:00
Debian	f85552a475	test(firewall): End-to-End-IPv6-Test (echte DB + Generator + nft -c) Guarded per EG_FWTEST_DSN (sonst skip). Migrations + v4/v6-Adressobjekte/Gruppe/icmpv6/v6-DNAT seeden, echten Generator.RenderToString laufen lassen, Output mit nft -c (via sudo) validieren. Verifiziert u.a.: gemischte Adressgruppe splittet in ip+ip6, gemischte v4/v6-NAT wird übersprungen, v6-DNAT-Target [..]:port. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-06-05 10:15:06 +02:00
Debian	92c5e25557	test(firewall): nft -c-Check via sudo lauffähig machen (netlink braucht root) nft -c liest den Kernel-Ruleset-Cache via netlink → root nötig. Test nutzt nun sudo -n (sonst skip). Verifiziert: gerendertes Dual-Stack-Ruleset (v4+v6-Regeln, v6-DNAT [..]:port, v6-SNAT/Masquerade, icmpv6) ist mit nft v1.1.3 syntaktisch gültig. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-06-04 22:17:34 +02:00
Debian	9383b870b0	feat(firewall): IPv6 in Regeln + NAT (familienbewusstes nft-Rendering) — v1.2.90 Bisher rendete das Template alle Adress-Matches als 'ip saddr/daddr' (v4-only); ein v6-Eintrag hätte 'nft -f' (und damit das ganze Ruleset) gebrochen. Jetzt: - Adressausdrücke werden je Eintrag als v4/v6 klassifiziert (addrFamily). - Regeln mit Adressen werden pro Familie als separate nft-Zeile gerendert (ip vs ip6 saddr/daddr); adresslose Regeln bleiben eine familienagnostische Zeile (v4-Verhalten unverändert). - icmp nur auf v4-, icmpv6 nur auf v6-Zeilen. - NAT familienbewusst inkl. v6-DNAT-Target [..]:port; gemischte v4/v6-NAT-Regeln werden übersprungen (statt nft -f zu brechen) + geloggt. - WireGuard site-to-site Masquerade v6-fähig. Eingabeseite war bereits v6-fähig (validateAddrObjValue/validateRule via net.ParseIP/ParseCIDR; Service-Proto-CHECK erlaubt icmpv6; Builtin PING-v6). Neue Unit-Tests (firewall_ipv6_test.go) inkl. optionalem 'nft -c'-Syntaxcheck. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-06-04 21:04:38 +02:00
Debian	4416d361a0	docs(migrations): 0030-Kommentar korrigieren — network/ip node-lokal, nicht repliziert Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-06-04 13:39:44 +02:00
Debian	58e42eb269	fix(cluster): node-lokale Tabellen aus Drift-Hash entfernen — v1.2.89 network_interfaces + ip_addresses standen in confighash hashSpec, aber in cluster_replication.go localOnlyTables (= nicht repliziert, node-spezifische IPs). Dadurch waren die config_hash-Werte zweier Nodes ZWANGSLÄUFIG dauerhaft verschieden → Drift-Banner, das kein Resync beheben konnte. Beide Tabellen aus dem Hash entfernt; Drift erkennt jetzt nur noch wirklich replizierte Service-Config. Muss auf BEIDEN Nodes installiert sein (gleicher hashSpec für vergleichbare Hashes). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>	2026-06-04 13:35:32 +02:00
@@ -1 +1 @@
 .2.88
 .2.91