Disallow urlencoded new lines in git protocol paths if there is a port (#13521)

Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/auth/repo_form.go

@@ -102,6 +102,9 @@ func ParseRemoteAddr(remoteAddr, authUsername, authPassword string, user *models
 			u.User = url.UserPassword(authUsername, authPassword)
 		}
 		remoteAddr = u.String()
+		if u.Scheme == "git" && u.Port() != "" && (strings.Contains(remoteAddr, "%0d") || strings.Contains(remoteAddr, "%0a")) {
+			return "", models.ErrInvalidCloneAddr{IsURLError: true}
+		}
 	} else if !user.CanImportLocal() {
 		return "", models.ErrInvalidCloneAddr{IsPermissionDenied: true}
 	} else if !com.IsDir(remoteAddr) {