initial commit to validate resource path content length

adapter/config/default_config.go

@@ -69,6 +69,7 @@ var defaultConfig = &Config{
 		SecuredListenerPort:              9095,
 		ClusterTimeoutInSeconds:          20,
 		EnforcerResponseTimeoutInSeconds: 20,
+		MaximumResourcePathLengthInKB:    -1,
 		KeyStore: keystore{
 			KeyPath:  "/home/wso2/security/keystore/mg.key",
 			CertPath: "/home/wso2/security/keystore/mg.pem",

adapter/config/types.go

@@ -118,6 +118,7 @@ type envoy struct {
 	Upstream                         envoyUpstream
 	Connection                       connection
 	RateLimit                        rateLimit
+	MaximumResourcePathLengthInKB    int16
 }
 
 type connectionTimeouts struct {

adapter/internal/oasparser/model/open_api.go

@@ -27,6 +27,7 @@ import (
 
 	"github.com/getkin/kin-openapi/openapi3"
 	"github.com/google/uuid"
+	"github.com/wso2/product-microgateway/adapter/config"
 	logger "github.com/wso2/product-microgateway/adapter/internal/loggers"
 )
 
@@ -130,7 +131,11 @@ func setResourcesOpenAPI(openAPI openapi3.Swagger) ([]*Resource, error) {
 	// resource level if vendor ext is not present at each resource level.
 	val, found := resolveDisableSecurity(openAPI.ExtensionProps)
 	if openAPI.Paths != nil {
+		conf, _ := config.ReadConfigs()
 		for path, pathItem := range openAPI.Paths {
+			if conf.Envoy.MaximumResourcePathLengthInKB != -1 && (isResourcePathLimitExceeds(path, int(conf.Envoy.MaximumResourcePathLengthInKB))) {
+				return nil, errors.New("The path " + path + " exceeds maximum allowed length")
+			}
 			// Checks for resource level security. (security is disabled in resource level using x-wso2-disable-security extension)
 			isResourceLvlSecurityDisabled, foundInResourceLevel := resolveDisableSecurity(pathItem.ExtensionProps)
 			methodsArray := make([]*Operation, len(pathItem.Operations()))

adapter/internal/oasparser/model/swagger.go

@@ -22,6 +22,8 @@ import (
 
 	"github.com/go-openapi/spec"
 	"github.com/google/uuid"
+
+	"github.com/wso2/product-microgateway/adapter/config"
 	logger "github.com/wso2/product-microgateway/adapter/internal/loggers"
 )
 
@@ -44,7 +46,11 @@ func (swagger *MgwSwagger) SetInfoSwagger(swagger2 spec.Swagger) error {
 	swagger.vendorExtensions = swagger2.VendorExtensible.Extensions
 	swagger.securityScheme = setSecurityDefinitions(swagger2)
 	swagger.security = swagger2.Security
-	swagger.resources = setResourcesSwagger(swagger2)
+	parsedEndpoints, epParsingError := setResourcesSwagger(swagger2)
+	if epParsingError != nil {
+		return errors.New("one of the resource paths exceeds maximum allowed content length")
+	}
+	swagger.resources = parsedEndpoints
 	swagger.apiType = HTTP
 	swagger.xWso2Basepath = swagger2.BasePath
 	// According to the definition, multiple schemes can be mentioned. Since the microgateway can assign only one scheme
@@ -80,13 +86,18 @@ func (swagger *MgwSwagger) SetInfoSwagger(swagger2 spec.Swagger) error {
 }
 
 // setResourcesSwagger sets swagger (openapi v2) paths as mgwSwagger resources.
-func setResourcesSwagger(swagger2 spec.Swagger) []*Resource {
+func setResourcesSwagger(swagger2 spec.Swagger) ([]*Resource, error) {
 	var resources []*Resource
 	// Check if the "x-wso2-disable-security" vendor ext is present at the API level.
 	// If API level vendor ext is present, then the same key:value should be added to
 	// resourve level, if it's not present at resource level using "addResourceLevelDisableSecurity"
 	if swagger2.Paths != nil {
+		conf, _ := config.ReadConfigs()
 		for path, pathItem := range swagger2.Paths.Paths {
+			if conf.Envoy.MaximumResourcePathLengthInKB != -1 &&
+				isResourcePathLimitExceeds(path, int(conf.Envoy.MaximumResourcePathLengthInKB)) {
+				return nil, errors.New("The path " + path + " exceeds maximum allowed length")
+			}
 			disableSecurity, found := swagger2.VendorExtensible.Extensions.GetBool(xWso2DisableSecurity)
 			// Checks for resource level security, if security is disabled in resource level,
 			// below code segment will override above two variable values (disableSecurity & found)
@@ -161,7 +172,7 @@ func setResourcesSwagger(swagger2 spec.Swagger) []*Resource {
 			}
 		}
 	}
-	return SortResources(resources)
+	return SortResources(resources), nil
 }
 
 // Sets security definitions defined in swagger 2 format.

adapter/internal/oasparser/model/swagger_internal_test.go

@@ -128,7 +128,8 @@ func TestSetResourcesSwagger(t *testing.T) {
 		},
 	}
 	for _, item := range dataItems {
-		resultResources := setResourcesSwagger(item.input)
+		parsedResources, _ := setResourcesSwagger(item.input)
+		resultResources := parsedResources
 		if item.result != nil {
 			assert.Equal(t, item.result[0].path, resultResources[0].GetPath(), item.message)
 			resultResources[0].GetMethod()[0].iD = item.result[0].methods[0].iD

adapter/internal/oasparser/model/types.go

@@ -349,3 +349,11 @@ func createDefaultAPIYaml() APIYaml {
 		},
 	}
 }
+
+func isResourcePathLimitExceeds(path string, maximumAllowedResourceLength int) bool {
+	strLength := len(path)
+	if float32(strLength)/1024 > float32(maximumAllowedResourceLength) {
+		return true
+	}
+	return false
+}