feat(auth): add WorkOS and Keycloak SSO providers (rebased) (#220)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/auth/auth.module.ts

@@ -3,9 +3,11 @@ import { createAuth, type Auth } from '@mosaic/auth';
 import type { Db } from '@mosaic/db';
 import { DB } from '../database/database.module.js';
 import { AUTH } from './auth.tokens.js';
+import { SsoController } from './sso.controller.js';
 
 @Global()
 @Module({
+  controllers: [SsoController],
   providers: [
     {
       provide: AUTH,

apps/gateway/src/auth/sso.controller.spec.ts

@@ -0,0 +1,40 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { SsoController } from './sso.controller.js';
+
+describe('SsoController', () => {
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it('lists configured OIDC providers', () => {
+    vi.stubEnv('WORKOS_CLIENT_ID', 'workos-client');
+    vi.stubEnv('WORKOS_CLIENT_SECRET', 'workos-secret');
+    vi.stubEnv('WORKOS_ISSUER', 'https://auth.workos.com/sso/client_123');
+
+    const controller = new SsoController();
+    const providers = controller.list();
+
+    expect(providers.find((provider) => provider.id === 'workos')).toMatchObject({
+      configured: true,
+      loginMode: 'oidc',
+      callbackPath: '/api/auth/oauth2/callback/workos',
+      teamSync: { enabled: true, claim: 'organization_id' },
+    });
+  });
+
+  it('prefers SAML fallback for Keycloak when only the SAML login URL is configured', () => {
+    vi.stubEnv('KEYCLOAK_SAML_LOGIN_URL', 'https://sso.example.com/realms/mosaic/protocol/saml');
+
+    const controller = new SsoController();
+    const providers = controller.list();
+
+    expect(providers.find((provider) => provider.id === 'keycloak')).toMatchObject({
+      configured: true,
+      loginMode: 'saml',
+      samlFallback: {
+        configured: true,
+        loginUrl: 'https://sso.example.com/realms/mosaic/protocol/saml',
+      },
+    });
+  });
+});

apps/gateway/src/auth/sso.controller.ts

@@ -0,0 +1,10 @@
+import { Controller, Get } from '@nestjs/common';
+import { buildSsoDiscovery, type SsoProviderDiscovery } from '@mosaic/auth';
+
+@Controller('api/sso/providers')
+export class SsoController {
+  @Get()
+  list(): SsoProviderDiscovery[] {
+    return buildSsoDiscovery();
+  }
+}

apps/gateway/src/main.ts

@@ -11,6 +11,7 @@ import { NestFactory } from '@nestjs/core';
 import { Logger, ValidationPipe } from '@nestjs/common';
 import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
 import helmet from '@fastify/helmet';
+import { listSsoStartupWarnings } from '@mosaic/auth';
 import { AppModule } from './app.module.js';
 import { mountAuthHandler } from './auth/auth.controller.js';
 import { mountMcpHandler } from './mcp/mcp.controller.js';
@@ -23,13 +24,8 @@ async function bootstrap(): Promise<void> {
     throw new Error('BETTER_AUTH_SECRET is required');
   }
 
-  if (
+  for (const warning of listSsoStartupWarnings()) {
-    process.env['AUTHENTIK_CLIENT_ID'] &&
+    logger.warn(warning);
-    (!process.env['AUTHENTIK_CLIENT_SECRET'] || !process.env['AUTHENTIK_ISSUER'])
-  ) {
-    console.warn(
-      '[warn] AUTHENTIK_CLIENT_ID is set but AUTHENTIK_CLIENT_SECRET or AUTHENTIK_ISSUER is missing — Authentik SSO will not work',
-    );
   }
 
   const app = await NestFactory.create<NestFastifyApplication>(

apps/web/src/app/(auth)/login/page.tsx

@@ -1,17 +1,27 @@
 'use client';
 
-import Link from 'next/link';
+import { useEffect, useState } from 'react';
 import { useRouter } from 'next/navigation';
-import { useState } from 'react';
+import Link from 'next/link';
-import { signIn } from '@/lib/auth-client';
+import { api } from '@/lib/api';
-import { getEnabledSsoProviders } from '@/lib/sso-providers';
+import { authClient, signIn } from '@/lib/auth-client';
+import type { SsoProviderDiscovery } from '@/lib/sso';
+import { SsoProviderButtons } from '@/components/auth/sso-provider-buttons';
 
 export default function LoginPage(): React.ReactElement {
   const router = useRouter();
   const [error, setError] = useState<string | null>(null);
   const [loading, setLoading] = useState(false);
-  const ssoProviders = getEnabledSsoProviders();
+  const [ssoProviders, setSsoProviders] = useState<SsoProviderDiscovery[]>([]);
-  const hasSsoProviders = ssoProviders.length > 0;
+  const [ssoLoadingProviderId, setSsoLoadingProviderId] = useState<
+    SsoProviderDiscovery['id'] | null
+  >(null);
+
+  useEffect(() => {
+    api<SsoProviderDiscovery[]>('/api/sso/providers')
+      .catch(() => [] as SsoProviderDiscovery[])
+      .then((providers) => setSsoProviders(providers.filter((provider) => provider.configured)));
+  }, []);
 
   async function handleSubmit(e: React.FormEvent<HTMLFormElement>): Promise<void> {
     e.preventDefault();
@@ -33,6 +43,27 @@ export default function LoginPage(): React.ReactElement {
     router.push('/chat');
   }
 
+  async function handleSsoSignIn(providerId: SsoProviderDiscovery['id']): Promise<void> {
+    setError(null);
+    setSsoLoadingProviderId(providerId);
+
+    try {
+      const result = await authClient.signIn.oauth2({
+        providerId,
+        callbackURL: '/chat',
+        newUserCallbackURL: '/chat',
+      });
+
+      if (result.error) {
+        setError(result.error.message ?? `Sign in with ${providerId} failed`);
+        setSsoLoadingProviderId(null);
+      }
+    } catch (err: unknown) {
+      setError(err instanceof Error ? err.message : `Sign in with ${providerId} failed`);
+      setSsoLoadingProviderId(null);
+    }
+  }
+
   return (
     <div>
       <h1 className="text-2xl font-semibold">Sign in</h1>
@@ -47,26 +78,7 @@ export default function LoginPage(): React.ReactElement {
         </div>
       )}
 
-      {hasSsoProviders && (
+      <form className="mt-6 space-y-4" onSubmit={handleSubmit}>
-        <div className="mt-6 space-y-3">
-          {ssoProviders.map((provider) => (
-            <Link
-              key={provider.id}
-              href={provider.href}
-              className="flex w-full items-center justify-center gap-2 rounded-lg border border-surface-border bg-surface-elevated px-4 py-2.5 text-sm font-medium text-text-primary transition-colors hover:bg-surface-hover focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 focus:ring-offset-surface-card"
-            >
-              {provider.buttonLabel}
-            </Link>
-          ))}
-          <div className="relative flex items-center">
-            <div className="flex-1 border-t border-surface-border" />
-            <span className="mx-3 text-xs text-text-muted">or</span>
-            <div className="flex-1 border-t border-surface-border" />
-          </div>
-        </div>
-      )}
-
-      <form className={hasSsoProviders ? 'space-y-4' : 'mt-6 space-y-4'} onSubmit={handleSubmit}>
         <div>
           <label htmlFor="email" className="block text-sm font-medium text-text-secondary">
             Email
@@ -108,6 +120,14 @@ export default function LoginPage(): React.ReactElement {
         </button>
       </form>
 
+      <SsoProviderButtons
+        providers={ssoProviders}
+        loadingProviderId={ssoLoadingProviderId}
+        onOidcSignIn={(providerId) => {
+          void handleSsoSignIn(providerId);
+        }}
+      />
+
       <p className="mt-4 text-center text-sm text-text-muted">
         Don&apos;t have an account?{' '}
         <Link href="/register" className="text-blue-400 hover:text-blue-300">

apps/web/src/app/(dashboard)/settings/page.tsx

@@ -3,6 +3,8 @@
 import { useCallback, useEffect, useState } from 'react';
 import { api } from '@/lib/api';
 import { authClient, useSession } from '@/lib/auth-client';
+import type { SsoProviderDiscovery } from '@/lib/sso';
+import { SsoProviderSection } from '@/components/settings/sso-provider-section';
 
 // ─── Types ────────────────────────────────────────────────────────────────────
 
@@ -424,7 +426,9 @@ function NotificationsTab(): React.ReactElement {
 
 function ProvidersTab(): React.ReactElement {
   const [providers, setProviders] = useState<ProviderInfo[]>([]);
+  const [ssoProviders, setSsoProviders] = useState<SsoProviderDiscovery[]>([]);
   const [loading, setLoading] = useState(true);
+  const [ssoLoading, setSsoLoading] = useState(true);
   const [testStatuses, setTestStatuses] = useState<Record<string, ProviderTestStatus>>({});
 
   useEffect(() => {
@@ -434,6 +438,13 @@ function ProvidersTab(): React.ReactElement {
       .finally(() => setLoading(false));
   }, []);
 
+  useEffect(() => {
+    api<SsoProviderDiscovery[]>('/api/sso/providers')
+      .catch(() => [] as SsoProviderDiscovery[])
+      .then((providers) => setSsoProviders(providers))
+      .finally(() => setSsoLoading(false));
+  }, []);
+
   const testConnection = useCallback(async (providerId: string): Promise<void> => {
     setTestStatuses((prev) => ({
       ...prev,
@@ -464,35 +475,44 @@ function ProvidersTab(): React.ReactElement {
     .find((m) => providers.find((p) => p.id === m.provider)?.available);
 
   return (
-    <section className="space-y-4">
+    <section className="space-y-6">
-      <h2 className="text-lg font-medium text-text-secondary">LLM Providers</h2>
+      <div className="space-y-4">
-      {loading ? (
+        <h2 className="text-lg font-medium text-text-secondary">SSO Providers</h2>
-        <p className="text-sm text-text-muted">Loading providers...</p>
+        <SsoProviderSection providers={ssoProviders} loading={ssoLoading} />
-      ) : providers.length === 0 ? (
+      </div>
-        <div className="rounded-lg border border-surface-border bg-surface-card p-4">
+
-          <p className="text-sm text-text-muted">
+      <div className="space-y-4">
-            No providers configured. Set{' '}
+        <h2 className="text-lg font-medium text-text-secondary">LLM Providers</h2>
-            <code className="rounded bg-surface-elevated px-1 py-0.5 text-xs">OLLAMA_BASE_URL</code>{' '}
+        {loading ? (
-            or{' '}
+          <p className="text-sm text-text-muted">Loading providers...</p>
-            <code className="rounded bg-surface-elevated px-1 py-0.5 text-xs">
+        ) : providers.length === 0 ? (
-              MOSAIC_CUSTOM_PROVIDERS
+          <div className="rounded-lg border border-surface-border bg-surface-card p-4">
-            </code>{' '}
+            <p className="text-sm text-text-muted">
-            to add providers.
+              No providers configured. Set{' '}
-          </p>
+              <code className="rounded bg-surface-elevated px-1 py-0.5 text-xs">
-        </div>
+                OLLAMA_BASE_URL
-      ) : (
+              </code>{' '}
-        <div className="space-y-4">
+              or{' '}
-          {providers.map((provider) => (
+              <code className="rounded bg-surface-elevated px-1 py-0.5 text-xs">
-            <ProviderCard
+                MOSAIC_CUSTOM_PROVIDERS
-              key={provider.id}
+              </code>{' '}
-              provider={provider}
+              to add providers.
-              defaultModel={defaultModel}
+            </p>
-              testStatus={testStatuses[provider.id] ?? { state: 'idle' }}
+          </div>
-              onTest={() => void testConnection(provider.id)}
+        ) : (
-            />
+          <div className="space-y-4">
-          ))}
+            {providers.map((provider) => (
-        </div>
+              <ProviderCard
-      )}
+                key={provider.id}
+                provider={provider}
+                defaultModel={defaultModel}
+                testStatus={testStatuses[provider.id] ?? { state: 'idle' }}
+                onTest={() => void testConnection(provider.id)}
+              />
+            ))}
+          </div>
+        )}
+      </div>
     </section>
   );
 }

apps/web/src/components/auth/sso-provider-buttons.spec.tsx

@@ -0,0 +1,45 @@
+import React from 'react';
+import { describe, expect, it, vi } from 'vitest';
+import { renderToStaticMarkup } from 'react-dom/server';
+import { SsoProviderButtons } from './sso-provider-buttons.js';
+
+describe('SsoProviderButtons', () => {
+  it('renders OIDC sign-in buttons and SAML fallback links', () => {
+    const html = renderToStaticMarkup(
+      <SsoProviderButtons
+        providers={[
+          {
+            id: 'workos',
+            name: 'WorkOS',
+            protocols: ['oidc'],
+            configured: true,
+            loginMode: 'oidc',
+            callbackPath: '/api/auth/oauth2/callback/workos',
+            teamSync: { enabled: true, claim: 'organization_id' },
+            samlFallback: { configured: false, loginUrl: null },
+            warnings: [],
+          },
+          {
+            id: 'keycloak',
+            name: 'Keycloak',
+            protocols: ['oidc', 'saml'],
+            configured: true,
+            loginMode: 'saml',
+            callbackPath: null,
+            teamSync: { enabled: true, claim: 'groups' },
+            samlFallback: {
+              configured: true,
+              loginUrl: 'https://sso.example.com/realms/mosaic/protocol/saml',
+            },
+            warnings: [],
+          },
+        ]}
+        onOidcSignIn={vi.fn()}
+      />,
+    );
+
+    expect(html).toContain('Continue with WorkOS');
+    expect(html).toContain('Continue with Keycloak (SAML)');
+    expect(html).toContain('https://sso.example.com/realms/mosaic/protocol/saml');
+  });
+});

apps/web/src/components/auth/sso-provider-buttons.tsx

@@ -0,0 +1,55 @@
+import React from 'react';
+import type { SsoProviderDiscovery } from '@/lib/sso';
+
+interface SsoProviderButtonsProps {
+  providers: SsoProviderDiscovery[];
+  loadingProviderId?: string | null;
+  onOidcSignIn: (providerId: SsoProviderDiscovery['id']) => void;
+}
+
+export function SsoProviderButtons({
+  providers,
+  loadingProviderId = null,
+  onOidcSignIn,
+}: SsoProviderButtonsProps): React.ReactElement | null {
+  const visibleProviders = providers.filter((provider) => provider.configured);
+
+  if (visibleProviders.length === 0) {
+    return null;
+  }
+
+  return (
+    <div className="mt-6 space-y-3 border-t border-surface-border pt-6">
+      <p className="text-sm font-medium text-text-secondary">Single sign-on</p>
+      <div className="space-y-3">
+        {visibleProviders.map((provider) => {
+          if (provider.loginMode === 'saml' && provider.samlFallback.loginUrl) {
+            return (
+              <a
+                key={provider.id}
+                href={provider.samlFallback.loginUrl}
+                className="flex w-full items-center justify-center rounded-lg border border-surface-border bg-surface-elevated px-4 py-2.5 text-sm font-medium text-text-primary transition-colors hover:border-accent/50 hover:text-accent"
+              >
+                Continue with {provider.name} (SAML)
+              </a>
+            );
+          }
+
+          return (
+            <button
+              key={provider.id}
+              type="button"
+              disabled={loadingProviderId === provider.id}
+              onClick={() => onOidcSignIn(provider.id)}
+              className="flex w-full items-center justify-center rounded-lg border border-surface-border bg-surface-elevated px-4 py-2.5 text-sm font-medium text-text-primary transition-colors hover:border-accent/50 hover:text-accent disabled:opacity-50"
+            >
+              {loadingProviderId === provider.id
+                ? `Redirecting to ${provider.name}...`
+                : `Continue with ${provider.name}`}
+            </button>
+          );
+        })}
+      </div>
+    </div>
+  );
+}

apps/web/src/components/settings/sso-provider-section.spec.tsx

@@ -0,0 +1,46 @@
+import React from 'react';
+import { describe, expect, it } from 'vitest';
+import { renderToStaticMarkup } from 'react-dom/server';
+import { SsoProviderSection } from './sso-provider-section.js';
+
+describe('SsoProviderSection', () => {
+  it('renders configured providers with callback, sync, and fallback details', () => {
+    const html = renderToStaticMarkup(
+      <SsoProviderSection
+        loading={false}
+        providers={[
+          {
+            id: 'workos',
+            name: 'WorkOS',
+            protocols: ['oidc'],
+            configured: true,
+            loginMode: 'oidc',
+            callbackPath: '/api/auth/oauth2/callback/workos',
+            teamSync: { enabled: true, claim: 'organization_id' },
+            samlFallback: { configured: false, loginUrl: null },
+            warnings: [],
+          },
+          {
+            id: 'keycloak',
+            name: 'Keycloak',
+            protocols: ['oidc', 'saml'],
+            configured: true,
+            loginMode: 'saml',
+            callbackPath: null,
+            teamSync: { enabled: true, claim: 'groups' },
+            samlFallback: {
+              configured: true,
+              loginUrl: 'https://sso.example.com/realms/mosaic/protocol/saml',
+            },
+            warnings: [],
+          },
+        ]}
+      />,
+    );
+
+    expect(html).toContain('WorkOS');
+    expect(html).toContain('/api/auth/oauth2/callback/workos');
+    expect(html).toContain('Team sync claim: organization_id');
+    expect(html).toContain('SAML fallback: https://sso.example.com/realms/mosaic/protocol/saml');
+  });
+});

apps/web/src/components/settings/sso-provider-section.tsx

@@ -0,0 +1,67 @@
+import React from 'react';
+import type { SsoProviderDiscovery } from '@/lib/sso';
+
+interface SsoProviderSectionProps {
+  providers: SsoProviderDiscovery[];
+  loading: boolean;
+}
+
+export function SsoProviderSection({
+  providers,
+  loading,
+}: SsoProviderSectionProps): React.ReactElement {
+  if (loading) {
+    return <p className="text-sm text-text-muted">Loading SSO providers...</p>;
+  }
+
+  const configuredProviders = providers.filter((provider) => provider.configured);
+
+  if (providers.length === 0 || configuredProviders.length === 0) {
+    return (
+      <div className="rounded-lg border border-surface-border bg-surface-card p-4">
+        <p className="text-sm text-text-muted">
+          No SSO providers configured. Set WorkOS or Keycloak environment variables to enable SSO.
+        </p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-4">
+      {configuredProviders.map((provider) => (
+        <div
+          key={provider.id}
+          className="rounded-lg border border-surface-border bg-surface-card p-4"
+        >
+          <div className="flex items-center justify-between gap-4">
+            <div>
+              <h3 className="text-sm font-medium text-text-primary">{provider.name}</h3>
+              <p className="text-xs text-text-muted">
+                {provider.protocols.join(' + ').toUpperCase()}
+                {provider.loginMode ? ` • primary ${provider.loginMode.toUpperCase()}` : ''}
+              </p>
+            </div>
+            <span className="rounded-full border border-accent/30 bg-accent/10 px-2 py-1 text-xs font-medium text-accent">
+              Enabled
+            </span>
+          </div>
+
+          <div className="mt-3 space-y-2 text-xs text-text-muted">
+            {provider.callbackPath && <p>Callback: {provider.callbackPath}</p>}
+            {provider.teamSync.enabled && provider.teamSync.claim && (
+              <p>Team sync claim: {provider.teamSync.claim}</p>
+            )}
+            {provider.samlFallback.configured && provider.samlFallback.loginUrl && (
+              <p>SAML fallback: {provider.samlFallback.loginUrl}</p>
+            )}
+            {provider.warnings.map((warning) => (
+              <p key={warning} className="text-warning">
+                {warning}
+              </p>
+            ))}
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}

apps/web/src/lib/sso.ts

@@ -0,0 +1,20 @@
+export type SsoProtocol = 'oidc' | 'saml';
+export type SsoLoginMode = 'oidc' | 'saml' | null;
+
+export interface SsoProviderDiscovery {
+  id: 'authentik' | 'workos' | 'keycloak';
+  name: string;
+  protocols: SsoProtocol[];
+  configured: boolean;
+  loginMode: SsoLoginMode;
+  callbackPath: string | null;
+  teamSync: {
+    enabled: boolean;
+    claim: string | null;
+  };
+  samlFallback: {
+    configured: boolean;
+    loginUrl: string | null;
+  };
+  warnings: string[];
+}

docs/guides/admin-guide.md

@@ -237,14 +237,23 @@ external clients. Authentication requires a valid BetterAuth session (cookie or
 
 ### SSO (Optional)
 
-| Variable                  | Description                    |
+| Variable                    | Description                                                                  |
-| ------------------------- | ------------------------------ |
+| --------------------------- | ---------------------------------------------------------------------------- |
-| `AUTHENTIK_CLIENT_ID`     | Authentik OAuth2 client ID     |
+| `AUTHENTIK_CLIENT_ID`       | Authentik OAuth2 client ID                                                   |
-| `AUTHENTIK_CLIENT_SECRET` | Authentik OAuth2 client secret |
+| `AUTHENTIK_CLIENT_SECRET`   | Authentik OAuth2 client secret                                               |
-| `AUTHENTIK_ISSUER`        | Authentik OIDC issuer URL      |
+| `AUTHENTIK_ISSUER`          | Authentik OIDC issuer URL                                                    |
+| `AUTHENTIK_TEAM_SYNC_CLAIM` | Optional claim used to derive team sync data (defaults to `groups`)          |
+| `WORKOS_CLIENT_ID`          | WorkOS OAuth client ID                                                       |
+| `WORKOS_CLIENT_SECRET`      | WorkOS OAuth client secret                                                   |
+| `WORKOS_ISSUER`             | WorkOS OIDC issuer URL                                                       |
+| `WORKOS_TEAM_SYNC_CLAIM`    | Optional claim used to derive team sync data (defaults to `organization_id`) |
+| `KEYCLOAK_CLIENT_ID`        | Keycloak OAuth client ID                                                     |
+| `KEYCLOAK_CLIENT_SECRET`    | Keycloak OAuth client secret                                                 |
+| `KEYCLOAK_ISSUER`           | Keycloak realm issuer URL                                                    |
+| `KEYCLOAK_TEAM_SYNC_CLAIM`  | Optional claim used to derive team sync data (defaults to `groups`)          |
+| `KEYCLOAK_SAML_LOGIN_URL`   | Optional SAML login URL used when OIDC is unavailable                        |
 
-All three Authentik variables must be set together. If only `AUTHENTIK_CLIENT_ID`
+Each OIDC provider requires its client ID, client secret, and issuer URL together. If only part of a provider configuration is set, gateway startup logs a warning and that provider is skipped. Keycloak can fall back to SAML when `KEYCLOAK_SAML_LOGIN_URL` is configured.
-is set, a warning is logged and SSO is disabled.
 
 ### Agent
 

packages/auth/src/auth.ts

@@ -1,8 +1,9 @@
 import { betterAuth } from 'better-auth';
 import { drizzleAdapter } from 'better-auth/adapters/drizzle';
 import { admin } from 'better-auth/plugins';
-import { genericOAuth, keycloak, type GenericOAuthConfig } from 'better-auth/plugins/generic-oauth';
+import { genericOAuth, type GenericOAuthConfig } from 'better-auth/plugins/generic-oauth';
 import type { Db } from '@mosaic/db';
+import { buildGenericOidcProviderConfigs } from './sso.js';
 
 export interface AuthConfig {
   db: Db;
@@ -10,118 +11,21 @@ export interface AuthConfig {
   secret?: string;
 }
 
-/** Builds the list of enabled OAuth providers from environment variables. Exported for testing. */
 export function buildOAuthProviders(): GenericOAuthConfig[] {
-  const providers: GenericOAuthConfig[] = [];
+  return buildGenericOidcProviderConfigs() as GenericOAuthConfig[];
-
-  const authentikIssuer = normalizeIssuer(process.env['AUTHENTIK_ISSUER']);
-  const authentikClientId = process.env['AUTHENTIK_CLIENT_ID'];
-  const authentikClientSecret = process.env['AUTHENTIK_CLIENT_SECRET'];
-  assertOptionalProviderConfig('Authentik SSO', {
-    required: ['AUTHENTIK_ISSUER', 'AUTHENTIK_CLIENT_ID', 'AUTHENTIK_CLIENT_SECRET'],
-    values: [authentikIssuer, authentikClientId, authentikClientSecret],
-  });
-
-  if (authentikIssuer && authentikClientId && authentikClientSecret) {
-    providers.push({
-      providerId: 'authentik',
-      clientId: authentikClientId,
-      clientSecret: authentikClientSecret,
-      issuer: authentikIssuer,
-      discoveryUrl: buildDiscoveryUrl(authentikIssuer),
-      scopes: ['openid', 'email', 'profile'],
-      requireIssuerValidation: true,
-    });
-  }
-
-  const workosIssuer = normalizeIssuer(process.env['WORKOS_ISSUER']);
-  const workosClientId = process.env['WORKOS_CLIENT_ID'];
-  const workosClientSecret = process.env['WORKOS_CLIENT_SECRET'];
-  assertOptionalProviderConfig('WorkOS SSO', {
-    required: ['WORKOS_ISSUER', 'WORKOS_CLIENT_ID', 'WORKOS_CLIENT_SECRET'],
-    values: [workosIssuer, workosClientId, workosClientSecret],
-  });
-
-  if (workosIssuer && workosClientId && workosClientSecret) {
-    providers.push({
-      providerId: 'workos',
-      clientId: workosClientId,
-      clientSecret: workosClientSecret,
-      issuer: workosIssuer,
-      discoveryUrl: buildDiscoveryUrl(workosIssuer),
-      scopes: ['openid', 'email', 'profile'],
-      requireIssuerValidation: true,
-    });
-  }
-
-  const keycloakIssuer = resolveKeycloakIssuer();
-  const keycloakClientId = process.env['KEYCLOAK_CLIENT_ID'];
-  const keycloakClientSecret = process.env['KEYCLOAK_CLIENT_SECRET'];
-  assertOptionalProviderConfig('Keycloak SSO', {
-    required: ['KEYCLOAK_CLIENT_ID', 'KEYCLOAK_CLIENT_SECRET', 'KEYCLOAK_ISSUER'],
-    values: [keycloakClientId, keycloakClientSecret, keycloakIssuer],
-  });
-
-  if (keycloakIssuer && keycloakClientId && keycloakClientSecret) {
-    providers.push(
-      keycloak({
-        clientId: keycloakClientId,
-        clientSecret: keycloakClientSecret,
-        issuer: keycloakIssuer,
-        scopes: ['openid', 'email', 'profile'],
-      }),
-    );
-  }
-
-  return providers;
-}
-
-function resolveKeycloakIssuer(): string | undefined {
-  const issuer = normalizeIssuer(process.env['KEYCLOAK_ISSUER']);
-  if (issuer) {
-    return issuer;
-  }
-
-  const baseUrl = normalizeIssuer(process.env['KEYCLOAK_URL']);
-  const realm = process.env['KEYCLOAK_REALM']?.trim();
-
-  if (!baseUrl || !realm) {
-    return undefined;
-  }
-
-  return `${baseUrl}/realms/${realm}`;
-}
-
-function buildDiscoveryUrl(issuer: string): string {
-  return `${issuer}/.well-known/openid-configuration`;
-}
-
-function normalizeIssuer(value: string | undefined): string | undefined {
-  return value?.trim().replace(/\/+$/, '') || undefined;
-}
-
-function assertOptionalProviderConfig(
-  providerName: string,
-  config: { required: string[]; values: Array<string | undefined> },
-): void {
-  const hasAnyValue = config.values.some((value) => Boolean(value?.trim()));
-  const hasAllValues = config.values.every((value) => Boolean(value?.trim()));
-
-  if (!hasAnyValue || hasAllValues) {
-    return;
-  }
-
-  throw new Error(
-    `@mosaic/auth: ${providerName} requires ${config.required.join(', ')}. Set them in your config or via the listed environment variables.`,
-  );
 }
 
 export function createAuth(config: AuthConfig) {
   const { db, baseURL, secret } = config;
-
+  const oidcConfigs = buildOAuthProviders();
-  const oauthProviders = buildOAuthProviders();
   const plugins =
-    oauthProviders.length > 0 ? [genericOAuth({ config: oauthProviders })] : undefined;
+    oidcConfigs.length > 0
+      ? [
+          genericOAuth({
+            config: oidcConfigs,
+          }),
+        ]
+      : undefined;
 
   const corsOrigin = process.env['GATEWAY_CORS_ORIGIN'] ?? 'http://localhost:3000';
   const trustedOrigins = corsOrigin.split(',').map((o) => o.trim());

packages/auth/src/index.ts

@@ -1 +1,12 @@
 export { createAuth, type Auth, type AuthConfig } from './auth.js';
+export {
+  buildGenericOidcProviderConfigs,
+  buildSsoDiscovery,
+  listSsoStartupWarnings,
+  type GenericOidcProviderConfig,
+  type SsoLoginMode,
+  type SsoProtocol,
+  type SsoProviderDiscovery,
+  type SsoTeamSyncConfig,
+  type SupportedSsoProviderId,
+} from './sso.js';

packages/auth/src/sso.spec.ts

@@ -0,0 +1,62 @@
+import { describe, expect, it } from 'vitest';
+import {
+  buildGenericOidcProviderConfigs,
+  buildSsoDiscovery,
+  listSsoStartupWarnings,
+} from './sso.js';
+
+describe('SSO provider config helpers', () => {
+  it('builds OIDC configs for Authentik, WorkOS, and Keycloak when fully configured', () => {
+    const configs = buildGenericOidcProviderConfigs({
+      AUTHENTIK_CLIENT_ID: 'authentik-client',
+      AUTHENTIK_CLIENT_SECRET: 'authentik-secret',
+      AUTHENTIK_ISSUER: 'https://authentik.example.com',
+      WORKOS_CLIENT_ID: 'workos-client',
+      WORKOS_CLIENT_SECRET: 'workos-secret',
+      WORKOS_ISSUER: 'https://auth.workos.com/sso/client_123',
+      KEYCLOAK_CLIENT_ID: 'keycloak-client',
+      KEYCLOAK_CLIENT_SECRET: 'keycloak-secret',
+      KEYCLOAK_ISSUER: 'https://sso.example.com/realms/mosaic',
+    });
+
+    expect(configs.map((config) => config.providerId)).toEqual(['authentik', 'workos', 'keycloak']);
+    expect(configs.find((config) => config.providerId === 'workos')).toMatchObject({
+      discoveryUrl: 'https://auth.workos.com/sso/client_123/.well-known/openid-configuration',
+      pkce: true,
+      requireIssuerValidation: true,
+    });
+    expect(configs.find((config) => config.providerId === 'keycloak')).toMatchObject({
+      discoveryUrl: 'https://sso.example.com/realms/mosaic/.well-known/openid-configuration',
+      pkce: true,
+    });
+  });
+
+  it('exposes Keycloak SAML fallback when OIDC is not configured', () => {
+    const providers = buildSsoDiscovery({
+      KEYCLOAK_SAML_LOGIN_URL: 'https://sso.example.com/realms/mosaic/protocol/saml',
+    });
+
+    expect(providers.find((provider) => provider.id === 'keycloak')).toMatchObject({
+      configured: true,
+      loginMode: 'saml',
+      samlFallback: {
+        configured: true,
+        loginUrl: 'https://sso.example.com/realms/mosaic/protocol/saml',
+      },
+    });
+  });
+
+  it('reports partial provider configuration as startup warnings', () => {
+    const warnings = listSsoStartupWarnings({
+      WORKOS_CLIENT_ID: 'workos-client',
+      KEYCLOAK_CLIENT_ID: 'keycloak-client',
+    });
+
+    expect(warnings).toContain(
+      'workos OIDC is partially configured. Missing: WORKOS_CLIENT_SECRET, WORKOS_ISSUER',
+    );
+    expect(warnings).toContain(
+      'keycloak OIDC is partially configured. Missing: KEYCLOAK_CLIENT_SECRET, KEYCLOAK_ISSUER',
+    );
+  });
+});

packages/auth/src/sso.ts

@@ -0,0 +1,241 @@
+export type SupportedSsoProviderId = 'authentik' | 'workos' | 'keycloak';
+export type SsoProtocol = 'oidc' | 'saml';
+export type SsoLoginMode = 'oidc' | 'saml' | null;
+
+type EnvMap = Record<string, string | undefined>;
+
+export interface GenericOidcProviderConfig {
+  providerId: SupportedSsoProviderId;
+  clientId: string;
+  clientSecret: string;
+  discoveryUrl?: string;
+  issuer?: string;
+  authorizationUrl?: string;
+  tokenUrl?: string;
+  userInfoUrl?: string;
+  scopes: string[];
+  pkce?: boolean;
+  requireIssuerValidation?: boolean;
+}
+
+export interface SsoTeamSyncConfig {
+  enabled: boolean;
+  claim: string | null;
+}
+
+export interface SsoProviderDiscovery {
+  id: SupportedSsoProviderId;
+  name: string;
+  protocols: SsoProtocol[];
+  configured: boolean;
+  loginMode: SsoLoginMode;
+  callbackPath: string | null;
+  teamSync: SsoTeamSyncConfig;
+  samlFallback: {
+    configured: boolean;
+    loginUrl: string | null;
+  };
+  warnings: string[];
+}
+
+const DEFAULT_SCOPES = ['openid', 'email', 'profile'];
+
+function readEnv(env: EnvMap, key: string): string | undefined {
+  const value = env[key]?.trim();
+  return value ? value : undefined;
+}
+
+function toDiscoveryUrl(issuer: string): string {
+  return `${issuer.replace(/\/$/, '')}/.well-known/openid-configuration`;
+}
+
+function getTeamSyncClaim(env: EnvMap, envKey: string, fallbackClaim?: string): SsoTeamSyncConfig {
+  const claim = readEnv(env, envKey) ?? fallbackClaim ?? null;
+  return {
+    enabled: claim !== null,
+    claim,
+  };
+}
+
+function buildAuthentikConfig(env: EnvMap): GenericOidcProviderConfig | null {
+  const issuer = readEnv(env, 'AUTHENTIK_ISSUER');
+  const clientId = readEnv(env, 'AUTHENTIK_CLIENT_ID');
+  const clientSecret = readEnv(env, 'AUTHENTIK_CLIENT_SECRET');
+
+  const fields = [issuer, clientId, clientSecret];
+  const presentCount = fields.filter(Boolean).length;
+  if (presentCount > 0 && presentCount < fields.length) {
+    throw new Error(
+      '@mosaic/auth: Authentik SSO requires AUTHENTIK_ISSUER, AUTHENTIK_CLIENT_ID, AUTHENTIK_CLIENT_SECRET.',
+    );
+  }
+  if (!issuer || !clientId || !clientSecret) {
+    return null;
+  }
+
+  const baseIssuer = issuer.replace(/\/$/, '');
+
+  return {
+    providerId: 'authentik',
+    issuer: baseIssuer,
+    clientId,
+    clientSecret,
+    discoveryUrl: toDiscoveryUrl(baseIssuer),
+    authorizationUrl: `${baseIssuer}/application/o/authorize/`,
+    tokenUrl: `${baseIssuer}/application/o/token/`,
+    userInfoUrl: `${baseIssuer}/application/o/userinfo/`,
+    scopes: DEFAULT_SCOPES,
+  };
+}
+
+function buildWorkosConfig(env: EnvMap): GenericOidcProviderConfig | null {
+  const issuer = readEnv(env, 'WORKOS_ISSUER');
+  const clientId = readEnv(env, 'WORKOS_CLIENT_ID');
+  const clientSecret = readEnv(env, 'WORKOS_CLIENT_SECRET');
+
+  const fields = [issuer, clientId, clientSecret];
+  const presentCount = fields.filter(Boolean).length;
+  if (presentCount > 0 && presentCount < fields.length) {
+    throw new Error(
+      '@mosaic/auth: WorkOS SSO requires WORKOS_ISSUER, WORKOS_CLIENT_ID, WORKOS_CLIENT_SECRET.',
+    );
+  }
+  if (!issuer || !clientId || !clientSecret) {
+    return null;
+  }
+
+  const normalizedIssuer = issuer.replace(/\/$/, '');
+
+  return {
+    providerId: 'workos',
+    issuer: normalizedIssuer,
+    clientId,
+    clientSecret,
+    discoveryUrl: toDiscoveryUrl(normalizedIssuer),
+    scopes: DEFAULT_SCOPES,
+    pkce: true,
+    requireIssuerValidation: true,
+  };
+}
+
+function buildKeycloakConfig(env: EnvMap): GenericOidcProviderConfig | null {
+  const explicitIssuer = readEnv(env, 'KEYCLOAK_ISSUER');
+  const keycloakUrl = readEnv(env, 'KEYCLOAK_URL');
+  const keycloakRealm = readEnv(env, 'KEYCLOAK_REALM');
+  const clientId = readEnv(env, 'KEYCLOAK_CLIENT_ID');
+  const clientSecret = readEnv(env, 'KEYCLOAK_CLIENT_SECRET');
+
+  // Derive issuer from KEYCLOAK_URL + KEYCLOAK_REALM if KEYCLOAK_ISSUER not set
+  const issuer =
+    explicitIssuer ??
+    (keycloakUrl && keycloakRealm
+      ? `${keycloakUrl.replace(/\/$/, '')}/realms/${keycloakRealm}`
+      : undefined);
+
+  const anySet = !!(issuer || clientId || clientSecret);
+  if (anySet && (!issuer || !clientId || !clientSecret)) {
+    throw new Error(
+      '@mosaic/auth: Keycloak SSO requires KEYCLOAK_CLIENT_ID, KEYCLOAK_CLIENT_SECRET, KEYCLOAK_ISSUER.',
+    );
+  }
+  if (!issuer || !clientId || !clientSecret) {
+    return null;
+  }
+
+  const normalizedIssuer = issuer.replace(/\/$/, '');
+
+  return {
+    providerId: 'keycloak',
+    issuer: normalizedIssuer,
+    clientId,
+    clientSecret,
+    discoveryUrl: toDiscoveryUrl(normalizedIssuer),
+    scopes: DEFAULT_SCOPES,
+    pkce: true,
+    requireIssuerValidation: true,
+  };
+}
+
+function collectWarnings(env: EnvMap, provider: SupportedSsoProviderId): string[] {
+  const prefix = provider.toUpperCase();
+  const oidcFields = [
+    `${prefix}_CLIENT_ID`,
+    `${prefix}_CLIENT_SECRET`,
+    `${prefix}_ISSUER`,
+  ] as const;
+  const presentOidcFields = oidcFields.filter((field) => readEnv(env, field));
+  const warnings: string[] = [];
+
+  if (presentOidcFields.length > 0 && presentOidcFields.length < oidcFields.length) {
+    const missing = oidcFields.filter((field) => !readEnv(env, field));
+    warnings.push(`${provider} OIDC is partially configured. Missing: ${missing.join(', ')}`);
+  }
+
+  return warnings;
+}
+
+export function buildGenericOidcProviderConfigs(
+  env: EnvMap = process.env,
+): GenericOidcProviderConfig[] {
+  return [buildAuthentikConfig(env), buildWorkosConfig(env), buildKeycloakConfig(env)].filter(
+    (config): config is GenericOidcProviderConfig => config !== null,
+  );
+}
+
+export function listSsoStartupWarnings(env: EnvMap = process.env): string[] {
+  return ['authentik', 'workos', 'keycloak'].flatMap((provider) =>
+    collectWarnings(env, provider as SupportedSsoProviderId),
+  );
+}
+
+export function buildSsoDiscovery(env: EnvMap = process.env): SsoProviderDiscovery[] {
+  const oidcConfigs = new Map(
+    buildGenericOidcProviderConfigs(env).map((config) => [config.providerId, config]),
+  );
+  const keycloakSamlLoginUrl = readEnv(env, 'KEYCLOAK_SAML_LOGIN_URL') ?? null;
+
+  return [
+    {
+      id: 'authentik',
+      name: 'Authentik',
+      protocols: ['oidc'],
+      configured: oidcConfigs.has('authentik'),
+      loginMode: oidcConfigs.has('authentik') ? 'oidc' : null,
+      callbackPath: oidcConfigs.has('authentik') ? '/api/auth/oauth2/callback/authentik' : null,
+      teamSync: getTeamSyncClaim(env, 'AUTHENTIK_TEAM_SYNC_CLAIM', 'groups'),
+      samlFallback: {
+        configured: false,
+        loginUrl: null,
+      },
+      warnings: collectWarnings(env, 'authentik'),
+    },
+    {
+      id: 'workos',
+      name: 'WorkOS',
+      protocols: ['oidc'],
+      configured: oidcConfigs.has('workos'),
+      loginMode: oidcConfigs.has('workos') ? 'oidc' : null,
+      callbackPath: oidcConfigs.has('workos') ? '/api/auth/oauth2/callback/workos' : null,
+      teamSync: getTeamSyncClaim(env, 'WORKOS_TEAM_SYNC_CLAIM', 'organization_id'),
+      samlFallback: {
+        configured: false,
+        loginUrl: null,
+      },
+      warnings: collectWarnings(env, 'workos'),
+    },
+    {
+      id: 'keycloak',
+      name: 'Keycloak',
+      protocols: ['oidc', 'saml'],
+      configured: oidcConfigs.has('keycloak') || keycloakSamlLoginUrl !== null,
+      loginMode: oidcConfigs.has('keycloak') ? 'oidc' : keycloakSamlLoginUrl ? 'saml' : null,
+      callbackPath: oidcConfigs.has('keycloak') ? '/api/auth/oauth2/callback/keycloak' : null,
+      teamSync: getTeamSyncClaim(env, 'KEYCLOAK_TEAM_SYNC_CLAIM', 'groups'),
+      samlFallback: {
+        configured: keycloakSamlLoginUrl !== null,
+        loginUrl: keycloakSamlLoginUrl,
+      },
+      warnings: collectWarnings(env, 'keycloak'),
+    },
+  ];
+}