FIXES: (#201)

* Fixes a bug in authentication, which permitted double slashed url entry [#PR200](https://github.com/gambol99/keycloak-proxy/pull/200)

FEATURES:
 * Grabbing the revocation-url from the idp config if user override is not specified [#PR193](https://github.com/gambol99/keycloak-proxy/pull/193)

CHANGELOG.md

 
 #### **2.0.4**
 
+FIXES:
+ * Fixes a bug in authentication, which permitted double slashed url entry [#PR200](https://github.com/gambol99/keycloak-proxy/pull/200)
+
 FEATURES:
  * Grabbing the revocation-url from the idp config if user override is not specified [#PR193](https://github.com/gambol99/keycloak-proxy/pull/193)
 

doc.go

@@ -24,7 +24,7 @@ import (
 )
 
 var (
-	release = "v2.0.3"
+	release = "v2.0.4"
 	gitsha  = "no gitsha provided"
 	version = release + " (git+sha: " + gitsha + ")"
 )

middleware.go

@@ -16,6 +16,7 @@ limitations under the License.
 package main
 
 import (
+	"bytes"
 	"fmt"
 	"regexp"
 	"strings"
@@ -33,6 +34,22 @@ const (
 	cxEnforce = "Enforcing"
 )
 
+// filterMiddleware is custom filtering for incoming requests
+func (r *oauthProxy) filterMiddleware() gin.HandlerFunc {
+	return func(cx *gin.Context) {
+		var p rune
+		var b bytes.Buffer
+		for _, c := range cx.Request.URL.Path {
+			if c == '/' && p == '/' {
+				continue
+			}
+			p = c
+			b.WriteRune(c)
+		}
+		cx.Request.URL.Path = b.String()
+	}
+}
+
 // loggingMiddleware is a custom http logger
 func (r *oauthProxy) loggingMiddleware() gin.HandlerFunc {
 	return func(cx *gin.Context) {

middleware_test.go

@@ -93,6 +93,54 @@ func TestRolePermissionsMiddleware(t *testing.T) {
 			Redirects: true,
 			Expects:   http.StatusOK,
 		},
+		{ // check for escaping
+			URI:       "//admin%2Ftest",
+			Redirects: true,
+			Expects:   http.StatusTemporaryRedirect,
+		},
+		{ // check for escaping
+			URI:       "/admin%2Ftest",
+			Redirects: true,
+			Expects:   http.StatusTemporaryRedirect,
+		},
+		{ // check for prefix slashs
+			URI:       "//admin/test",
+			Redirects: true,
+			Expects:   http.StatusTemporaryRedirect,
+		},
+		{ // check for prefix slashs
+			URI:       "/admin//test",
+			Redirects: true,
+			Expects:   http.StatusTemporaryRedirect,
+		},
+		{ // check for prefix slashs
+			URI:       "/admin//test",
+			Redirects: false,
+			HasToken:  true,
+			Expects:   http.StatusForbidden,
+		},
+		{ // check for dodgy url
+			URI:       "//admin/../admin/test",
+			Redirects: true,
+			Expects:   http.StatusTemporaryRedirect,
+		},
+		{ // check for dodgy url
+			URI:       "/help/../admin/test",
+			Redirects: true,
+			Expects:   http.StatusTemporaryRedirect,
+		},
+		{ // check for it works
+			URI:      "//admin/test",
+			HasToken: true,
+			Roles:    []string{fakeAdminRole},
+			Expects:  http.StatusOK,
+		},
+		{ // check for it works
+			URI:      "//admin//test",
+			HasToken: true,
+			Roles:    []string{fakeAdminRole},
+			Expects:  http.StatusOK,
+		},
 		{ // check with a token
 			URI:       "/",
 			Redirects: false,

server.go

@@ -154,6 +154,9 @@ func (r *oauthProxy) createReverseProxy() error {
 	// step: create the gin router
 	engine := gin.New()
 	engine.Use(gin.Recovery())
+	// step: custom filtering
+	engine.Use(r.filterMiddleware())
+
 	// step: is profiling enabled?
 	if r.config.EnableProfiling {
 		log.Warn("Enabling the debug profiling on /debug/pprof")