Added various options to the 'Defang URL' operation.

CHANGELOG.md

@@ -1,6 +1,9 @@
 # Changelog
 All notable changes to CyberChef will be documented in this file.
 
+### [8.9.0] - 2018-11-07
+- 'Defang URL' operation added [@arnydo] | [#394]
+
 ### [8.8.0] - 2018-10-10
 - 'Parse TLV' operation added [@GCHQ77703] | [#351]
 
@@ -76,6 +79,7 @@ All notable changes to CyberChef will be documented in this file.
 [@JustAnotherMark]: https://github.com/JustAnotherMark
 [@sevzero]: https://github.com/sevzero
 [@PenguinGeorge]: https://github.com/PenguinGeorge
+[@arnydo]: https://github.com/arnydo
 
 [#95]: https://github.com/gchq/CyberChef/pull/299
 [#173]: https://github.com/gchq/CyberChef/pull/173
@@ -95,3 +99,4 @@ All notable changes to CyberChef will be documented in this file.
 [#344]: https://github.com/gchq/CyberChef/pull/344
 [#348]: https://github.com/gchq/CyberChef/pull/348
 [#351]: https://github.com/gchq/CyberChef/pull/351
+[#394]: https://github.com/gchq/CyberChef/pull/394

src/core/config/Categories.json

@@ -159,7 +159,8 @@
             "Change IP format",
             "Group IP addresses",
             "Encode NetBIOS Name",
-            "Decode NetBIOS Name"
+            "Decode NetBIOS Name",
+            "Defang URL"
         ]
     },
     {
@@ -208,8 +209,7 @@
             "Escape string",
             "Unescape string",
             "Pseudo-Random Number Generator",
-            "Sleep",
-            "Defang URL"
+            "Sleep"
         ]
     },
     {

src/core/lib/Extract.mjs

@@ -39,3 +39,21 @@ export function search (input, searchRegex, removeRegex, includeTotal) {
 
     return output;
 }
+
+
+/**
+ * URL regular expression
+ */
+const protocol = "[A-Z]+://",
+    hostname = "[-\\w]+(?:\\.\\w[-\\w]*)+",
+    port = ":\\d+",
+    path = "/[^.!,?\"<>\\[\\]{}\\s\\x7F-\\xFF]*" +
+        "(?:[.!,?]+[^.!,?\"<>\\[\\]{}\\s\\x7F-\\xFF]+)*";
+
+export const URL_REGEX = new RegExp(protocol + hostname + "(?:" + port + ")?(?:" + path + ")?", "ig");
+
+
+/**
+ * Domain name regular expression
+ */
+export const DOMAIN_REGEX = /\b((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,63}\b/ig;

src/core/operations/DefangURL.mjs

@@ -1,10 +1,12 @@
 /**
  * @author arnydo [arnydo@protonmail.com]
- * @copyright Crown Copyright 2016
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2018
  * @license Apache-2.0
  */
 
 import Operation from "../Operation";
+import {URL_REGEX, DOMAIN_REGEX} from "../lib/Extract";
 
 /**
  * DefangURL operation
@@ -18,12 +20,33 @@ class DefangURL extends Operation {
         super();
 
         this.name = "Defang URL";
-        this.module = "URL";
-        this.description = "Takes a Universal Resource Locator (URL) and 'Defangs' it; meaning, the URL becomes invalid and neutralizes the risk of accidentally clicking on a malicious link.<br><br>This is often used when dealing with malicious links or IOCs.<br><br>Works well when combined with the 'Extract URLs' operation.";
-        this.infoURL = "";
+        this.module = "Default";
+        this.description = "Takes a Universal Resource Locator (URL) and 'Defangs' it; meaning the URL becomes invalid, neutralising the risk of accidentally clicking on a malicious link.<br><br>This is often used when dealing with malicious links or IOCs.<br><br>Works well when combined with the 'Extract URLs' operation.";
+        this.infoURL = "https://isc.sans.edu/forums/diary/Defang+all+the+things/22744/";
         this.inputType = "string";
         this.outputType = "string";
-        this.args = [];
+        this.args = [
+            {
+                name: "Escape dots",
+                type: "boolean",
+                value: true
+            },
+            {
+                name: "Escape http",
+                type: "boolean",
+                value: true
+            },
+            {
+                name: "Escape ://",
+                type: "boolean",
+                value: true
+            },
+            {
+                name: "Process",
+                type: "option",
+                value: ["Valid domains and full URLs", "Only full URLs", "Everything"]
+            }
+        ];
     }
 
     /**
@@ -32,12 +55,48 @@ class DefangURL extends Operation {
      * @returns {string}
      */
     run(input, args) {
-        let defang = input.replace(/http/gi, "hxxp");
-        defang = defang.replace(/\./g, "[.]");
-        defang = defang.replace(/:\/\//g, "[://]");
-        return defang;
+        const [dots, http, slashes, process] = args;
+
+        switch (process) {
+            case "Valid domains and full URLs":
+                input = input.replace(URL_REGEX, x => {
+                    return defangURL(x, dots, http, slashes);
+                });
+                input = input.replace(DOMAIN_REGEX, x => {
+                    return defangURL(x, dots, http, slashes);
+                });
+                break;
+            case "Only full URLs":
+                input = input.replace(URL_REGEX, x => {
+                    return defangURL(x, dots, http, slashes);
+                });
+                break;
+            case "Everything":
+                input = defangURL(input, dots, http, slashes);
+                break;
+        }
+
+        return input;
     }
 
 }
 
+
+/**
+ * Defangs a given URL
+ *
+ * @param {string} url
+ * @param {boolean} dots
+ * @param {boolean} http
+ * @param {boolean} slashes
+ * @returns {string}
+ */
+function defangURL(url, dots, http, slashes) {
+    if (dots) url = url.replace(/\./g, "[.]");
+    if (http) url = url.replace(/http/gi, "hxxp");
+    if (slashes) url = url.replace(/:\/\//g, "[://]");
+
+    return url;
+}
+
 export default DefangURL;

src/core/operations/ExtractDomains.mjs

@@ -5,7 +5,7 @@
  */
 
 import Operation from "../Operation";
-import { search } from "../lib/Extract";
+import { search, DOMAIN_REGEX } from "../lib/Extract";
 
 /**
  * Extract domains operation
@@ -38,10 +38,8 @@ class ExtractDomains extends Operation {
      * @returns {string}
      */
     run(input, args) {
-        const displayTotal = args[0],
-            regex = /\b((?=[a-z0-9-]{1,63}\.)(xn--)?[a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,63}\b/ig;
-
-        return search(input, regex, null, displayTotal);
+        const displayTotal = args[0];
+        return search(input, DOMAIN_REGEX, null, displayTotal);
     }
 
 }

src/core/operations/ExtractURLs.mjs

@@ -5,7 +5,7 @@
  */
 
 import Operation from "../Operation";
-import { search } from "../lib/Extract";
+import { search, URL_REGEX } from "../lib/Extract";
 
 /**
  * Extract URLs operation
@@ -38,16 +38,8 @@ class ExtractURLs extends Operation {
      * @returns {string}
      */
     run(input, args) {
-        const displayTotal = args[0],
-            protocol = "[A-Z]+://",
-            hostname = "[-\\w]+(?:\\.\\w[-\\w]*)+",
-            port = ":\\d+";
-        let path = "/[^.!,?\"<>\\[\\]{}\\s\\x7F-\\xFF]*";
-
-        path += "(?:[.!,?]+[^.!,?\"<>\\[\\]{}\\s\\x7F-\\xFF]+)*";
-        const regex = new RegExp(protocol + hostname + "(?:" + port +
-            ")?(?:" + path + ")?", "ig");
-        return search(input, regex, null, displayTotal);
+        const displayTotal = args[0];
+        return search(input, URL_REGEX, null, displayTotal);
     }
 
 }