Match only for actual session cookie

OVH has implemented load balancing in a very questionable way where the reverse proxy actually internally adds some cookies which would trigger a security exception. To work around this, this change only checks for the session cookie.

lib/private/AppFramework/Http/Request.php

@@ -485,6 +485,19 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		return $this->csrfTokenManager->isTokenValid($token);
 	}
 
+	/**
+	 * Whether the cookie checks are required
+	 *
+	 * @return bool
+	 */
+	private function cookieCheckRequired() {
+		if($this->getCookie(session_name()) === null && $this->getCookie('oc_token') === null) {
+			return false;
+		}
+
+		return true;
+	}
+
 	/**
 	 * Checks if the strict cookie has been sent with the request if the request
 	 * is including any cookies.
@@ -493,7 +506,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @since 9.1.0
 	 */
 	public function passesStrictCookieCheck() {
-		if(count($this->cookies) === 0) {
+		if(!$this->cookieCheckRequired()) {
 			return true;
 		}
 		if($this->getCookie('nc_sameSiteCookiestrict') === 'true'
@@ -511,7 +524,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @since 9.1.0
 	 */
 	public function passesLaxCookieCheck() {
-		if(count($this->cookies) === 0) {
+		if(!$this->cookieCheckRequired()) {
 			return true;
 		}
 		if($this->getCookie('nc_sameSiteCookielax') === 'true') {

tests/lib/AppFramework/Http/RequestTest.php

@@ -1469,6 +1469,7 @@ class RequestTest extends \Test\TestCase {
 						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
 					],
 					'cookies' => [
+						session_name() => 'asdf',
 						'nc_sameSiteCookiestrict' => 'true',
 					],
 				],
@@ -1495,6 +1496,7 @@ class RequestTest extends \Test\TestCase {
 						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
 					],
 					'cookies' => [
+						session_name() => 'asdf',
 						'nc_sameSiteCookiestrict' => 'true',
 						'nc_sameSiteCookielax' => 'true',
 					],
@@ -1509,7 +1511,76 @@ class RequestTest extends \Test\TestCase {
 		$this->assertTrue($request->passesStrictCookieCheck());
 	}
 
-	public function testFailsSRFCheckWithPostAndWithCookies() {
+	public function testPassesStrictCookieCheckWithRandomCookies() {
+		/** @var Request $request */
+		$request = $this->getMockBuilder('\OC\AppFramework\Http\Request')
+			->setMethods(['getScriptName'])
+			->setConstructorArgs([
+				[
+					'server' => [
+						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
+					],
+					'cookies' => [
+						'RandomCookie' => 'asdf',
+					],
+				],
+				$this->secureRandom,
+				$this->config,
+				$this->csrfTokenManager,
+				$this->stream
+			])
+			->getMock();
+
+		$this->assertTrue($request->passesStrictCookieCheck());
+	}
+
+	public function testFailsStrictCookieCheckWithSessionCookie() {
+		/** @var Request $request */
+		$request = $this->getMockBuilder('\OC\AppFramework\Http\Request')
+			->setMethods(['getScriptName'])
+			->setConstructorArgs([
+				[
+					'server' => [
+						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
+					],
+					'cookies' => [
+						session_name() => 'asdf',
+					],
+				],
+				$this->secureRandom,
+				$this->config,
+				$this->csrfTokenManager,
+				$this->stream
+			])
+			->getMock();
+
+		$this->assertFalse($request->passesStrictCookieCheck());
+	}
+
+	public function testFailsStrictCookieCheckWithRememberMeCookie() {
+		/** @var Request $request */
+		$request = $this->getMockBuilder('\OC\AppFramework\Http\Request')
+			->setMethods(['getScriptName'])
+			->setConstructorArgs([
+				[
+					'server' => [
+						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
+					],
+					'cookies' => [
+						'oc_token' => 'asdf',
+					],
+				],
+				$this->secureRandom,
+				$this->config,
+				$this->csrfTokenManager,
+				$this->stream
+			])
+			->getMock();
+
+		$this->assertFalse($request->passesStrictCookieCheck());
+	}
+
+	public function testFailsCSRFCheckWithPostAndWithCookies() {
 		/** @var Request $request */
 		$request = $this->getMockBuilder('\OC\AppFramework\Http\Request')
 			->setMethods(['getScriptName'])
@@ -1519,6 +1590,7 @@ class RequestTest extends \Test\TestCase {
 						'requesttoken' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
 					],
 					'cookies' => [
+						session_name() => 'asdf',
 						'foo' => 'bar',
 					],
 				],
@@ -1545,6 +1617,7 @@ class RequestTest extends \Test\TestCase {
 						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
 					],
 					'cookies' => [
+						session_name() => 'asdf',
 						'nc_sameSiteCookielax' => 'true',
 					],
 				],
@@ -1568,6 +1641,7 @@ class RequestTest extends \Test\TestCase {
 						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
 					],
 					'cookies' => [
+						session_name() => 'asdf',
 						'nc_sameSiteCookiestrict' => 'true',
 					],
 				],
@@ -1591,6 +1665,7 @@ class RequestTest extends \Test\TestCase {
 						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
 					],
 					'cookies' => [
+						session_name() => 'asdf',
 						'nc_sameSiteCookielax' => 'true',
 					],
 				],
@@ -1614,6 +1689,7 @@ class RequestTest extends \Test\TestCase {
 						'HTTP_REQUESTTOKEN' => 'AAAHGxsTCTc3BgMQESAcNR0OAR0=:MyTotalSecretShareds',
 					],
 					'cookies' => [
+						session_name() => 'asdf',
 						'nc_sameSiteCookiestrict' => 'true',
 					],
 				],