OIDC Userinfo: Added additional tests to cover jwks usage

app/Access/Oidc/OidcJwtWithClaims.php

@@ -59,7 +59,7 @@ class OidcJwtWithClaims implements ProvidesClaims
      *
      * @throws OidcInvalidTokenException
      */
-    protected function validateCommonTokenDetails(): bool
+    public function validateCommonTokenDetails(): bool
     {
         $this->validateTokenStructure();
         $this->validateTokenSignature();
@@ -151,7 +151,7 @@ class OidcJwtWithClaims implements ProvidesClaims
      *
      * @throws OidcInvalidTokenException
      */
-    public function validateCommonClaims(): void
+    protected function validateCommonClaims(): void
     {
         // 1. The Issuer Identifier for the OpenID Provider (which is typically obtained during Discovery)
         // MUST exactly match the value of the iss (issuer) Claim.

app/Access/Oidc/OidcUserinfoResponse.php

@@ -20,11 +20,6 @@ class OidcUserinfoResponse implements ProvidesClaims
             $this->jwt = new OidcJwtWithClaims($response->getBody()->getContents(), $issuer, $keys);
             $this->claims = $this->jwt->getAllClaims();
         }
-
-        // TODO - Response validation (5.3.4):
-            // TODO - Verify that the OP that responded was the intended OP through a TLS server certificate check, per RFC 6125 [RFC6125].
-            // TODO - If the Client has provided a userinfo_encrypted_response_alg parameter during Registration, decrypt the UserInfo Response using the keys specified during Registration.
-            // TODO - If the response was signed, the Client SHOULD validate the signature according to JWS [JWS].
     }
 
     /**
@@ -33,7 +28,7 @@ class OidcUserinfoResponse implements ProvidesClaims
     public function validate(string $idTokenSub): bool
     {
         if (!is_null($this->jwt)) {
-            $this->jwt->validateCommonClaims();
+            $this->jwt->validateCommonTokenDetails();
         }
 
         $sub = $this->getClaim('sub');
@@ -49,6 +44,14 @@ class OidcUserinfoResponse implements ProvidesClaims
             throw new OidcInvalidTokenException("Subject value provided in the userinfo endpoint does not match the provided ID token value");
         }
 
+        // Spec v1.0 5.3.4 Defines the following:
+        // Verify that the OP that responded was the intended OP through a TLS server certificate check, per RFC 6125 [RFC6125].
+          // This is effectively done as part of the HTTP request we're making through CURLOPT_SSL_VERIFYHOST on the request.
+        // If the Client has provided a userinfo_encrypted_response_alg parameter during Registration, decrypt the UserInfo Response using the keys specified during Registration.
+          // We don't currently support JWT encryption for OIDC
+        // If the response was signed, the Client SHOULD validate the signature according to JWS [JWS].
+          // This is done as part of the validateCommonClaims above.
+
         return true;
     }
 

tests/Auth/OidcTest.php

@@ -787,6 +787,68 @@ class OidcTest extends TestCase
         $this->assertTrue($user->hasRole($roleA->id));
     }
 
+    public function test_userinfo_endpoint_jwks_response_handled()
+    {
+        $userinfoResponseData = OidcJwtHelper::idToken(['name' => 'Barry Jwks']);
+        $userinfoResponse = new Response(200, ['Content-Type'  => 'application/jwt'], $userinfoResponseData);
+
+        $resp = $this->runLogin(['name' => null], [$userinfoResponse]);
+        $resp->assertRedirect('/');
+
+        $user = User::where('email', OidcJwtHelper::defaultPayload()['email'])->first();
+        $this->assertEquals('Barry Jwks', $user->name);
+    }
+
+    public function test_userinfo_endpoint_jwks_response_returning_no_sub_throws()
+    {
+        $userinfoResponseData = OidcJwtHelper::idToken(['sub' => null]);
+        $userinfoResponse = new Response(200, ['Content-Type'  => 'application/jwt'], $userinfoResponseData);
+
+        $resp = $this->runLogin(['name' => null], [$userinfoResponse]);
+        $resp->assertRedirect('/login');
+        $this->assertSessionError('Userinfo endpoint response validation failed with error: No valid subject value found in userinfo data');
+    }
+
+    public function test_userinfo_endpoint_jwks_response_returning_non_matching_sub_throws()
+    {
+        $userinfoResponseData = OidcJwtHelper::idToken(['sub' => 'zzz123']);
+        $userinfoResponse = new Response(200, ['Content-Type'  => 'application/jwt'], $userinfoResponseData);
+
+        $resp = $this->runLogin(['name' => null], [$userinfoResponse]);
+        $resp->assertRedirect('/login');
+        $this->assertSessionError('Userinfo endpoint response validation failed with error: Subject value provided in the userinfo endpoint does not match the provided ID token value');
+    }
+
+    public function test_userinfo_endpoint_jwks_response_with_invalid_signature_throws()
+    {
+        $userinfoResponseData = OidcJwtHelper::idToken();
+        $exploded = explode('.', $userinfoResponseData);
+        $exploded[2] = base64_encode(base64_decode($exploded[2]) . 'ABC');
+        $userinfoResponse = new Response(200, ['Content-Type'  => 'application/jwt'], implode('.', $exploded));
+
+        $resp = $this->runLogin(['name' => null], [$userinfoResponse]);
+        $resp->assertRedirect('/login');
+        $this->assertSessionError('Userinfo endpoint response validation failed with error: Token signature could not be validated using the provided keys');
+    }
+
+    public function test_userinfo_endpoint_jwks_response_with_invalid_signature_alg_throws()
+    {
+        $userinfoResponseData = OidcJwtHelper::idToken([], ['alg' => 'ZZ512']);
+        $userinfoResponse = new Response(200, ['Content-Type'  => 'application/jwt'], $userinfoResponseData);
+
+        $resp = $this->runLogin(['name' => null], [$userinfoResponse]);
+        $resp->assertRedirect('/login');
+        $this->assertSessionError('Userinfo endpoint response validation failed with error: Only RS256 signature validation is supported. Token reports using ZZ512');
+    }
+
+    public function test_userinfo_endpoint_response_with_invalid_content_type_throws()
+    {
+        $userinfoResponse = new Response(200, ['Content-Type'  => 'application/beans'], json_encode(OidcJwtHelper::defaultPayload()));
+        $resp = $this->runLogin(['name' => null], [$userinfoResponse]);
+        $resp->assertRedirect('/login');
+        $this->assertSessionError('Userinfo endpoint response validation failed with error: No valid subject value found in userinfo data');
+    }
+
     protected function withAutodiscovery(): void
     {
         config()->set([