Implement CSRF protection

Enabled for all POST endpoints, as well as for GET /rpc-browser when the
"execute" query string argument is specified.

app.js

@@ -11,6 +11,7 @@ var logger = require('morgan');
 var cookieParser = require('cookie-parser');
 var bodyParser = require('body-parser');
 var session = require("express-session");
+var csurf = require("csurf");
 var config = require("./app/config.js");
 var simpleGit = require('simple-git');
 var utils = require("./app/utils.js");
@@ -454,6 +455,11 @@ app.use(function(req, res, next) {
 	next();
 });
 
+app.use(csurf(), (req, res, next) => {
+	res.locals.csrfToken = req.csrfToken();
+	next();
+});
+
 app.use('/', baseActionsRouter);
 
 /// catch 404 and forwarding to error handler

package.json

@@ -28,6 +28,7 @@
     "body-parser": "~1.18.2",
     "cookie-parser": "~1.4.3",
     "crypto-js": "3.1.9-1",
+    "csurf": "^1.9.0",
     "debug": "~2.6.0",
     "decimal.js": "7.2.3",
     "dotenv": "^6.2.0",

routes/baseActionsRouter.js

@@ -1,4 +1,5 @@
 var express = require('express');
+var csurf = require('csurf');
 var router = express.Router();
 var util = require('util');
 var moment = require('moment');
@@ -14,6 +15,8 @@ var coins = require("./../app/coins.js");
 var config = require("./../app/config.js");
 var coreApi = require("./../app/api/coreApi.js");
 
+const forceCsrf = csurf({ ignoreMethods: [] });
+
 router.get("/", function(req, res) {
 	if (req.session.host == null || req.session.host.trim() == "") {
 		if (req.cookies['rpc-host']) {
@@ -815,7 +818,7 @@ router.post("/rpc-terminal", function(req, res) {
 	});
 });
 
-router.get("/rpc-browser", function(req, res) {
+router.get("/rpc-browser", function(req, res, next) {
 	if (!config.demoSite) {
 		var ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
 		var match = config.ipWhitelistForRpcCommands.exec(ip);
@@ -883,26 +886,30 @@ router.get("/rpc-browser", function(req, res) {
 						return;
 					}
 
-					console.log("Executing RPC '" + req.query.method + "' with params: [" + argValues + "]");
+					forceCsrf(req, res, err => {
+						if (err) return next(err);
+
+						console.log("Executing RPC '" + req.query.method + "' with params: [" + argValues + "]");
 
-					client.command([{method:req.query.method, parameters:argValues}], function(err3, result3, resHeaders3) {
-						console.log("RPC Response: err=" + err3 + ", result=" + result3 + ", headers=" + resHeaders3);
+						client.command([{method:req.query.method, parameters:argValues}], function(err3, result3, resHeaders3) {
+							console.log("RPC Response: err=" + err3 + ", result=" + result3 + ", headers=" + resHeaders3);
 
-						if (err3) {
-							if (result3) {
-								res.locals.methodResult = {error:("" + err3), result:result3};
+							if (err3) {
+								if (result3) {
+									res.locals.methodResult = {error:("" + err3), result:result3};
+
+								} else {
+									res.locals.methodResult = {error:("" + err3)};
+								}
+							} else if (result3) {
+								res.locals.methodResult = result3;
 
 							} else {
-								res.locals.methodResult = {error:("" + err3)};
+								res.locals.methodResult = {"Error":"No response from node."};
 							}
-						} else if (result3) {
-							res.locals.methodResult = result3;
 
-						} else {
-							res.locals.methodResult = {"Error":"No response from node."};
-						}
-
-						res.render("browser");
+							res.render("browser");
+						});
 					});
 				} else {
 					res.render("browser");

views/browser.pug

@@ -46,6 +46,7 @@ block content
 								hr
 
 							form(method="get")
+								input(type="hidden", name="_csrf", value=csrfToken)
 								input(type="hidden", name="method", value=method)
 
 								div(class="h5 mb-3") Arguments

views/connect.pug

@@ -5,6 +5,8 @@ block content
 	hr
 
 	form(method="post", action="/connect")
+		input(type="hidden", name="_csrf", value=csrfToken)
+
 		div(class="form-group")
 			label(for="input-host") Host / IP
 			input(id="input-host", type="text", name="host", class="form-control", placeholder="Host / IP", value=host)

views/layout.pug

@@ -2,6 +2,7 @@ doctype html
 html(lang="en")
 	head
 		meta(charset="utf-8")
+		meta(name="csrf-token", content=csrfToken)
 		meta(name="viewport", content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0, shrink-to-fit=no")
 		
 		if (session.uiTheme && session.uiTheme == "dark")
@@ -86,6 +87,7 @@ html(lang="en")
 										span  Dark
 
 						form(method="post", action="/search", class="form-inline")
+							input(type="hidden", name="_csrf", value=csrfToken)
 							div(class="input-group input-group-sm")
 								input(type="text", class="form-control form-control-sm", name="query", placeholder="block height/hash, txid, address", value=(query), style="width: 300px;")
 								div(class="input-group-append")

views/search.pug

@@ -9,6 +9,7 @@ block content
 
 	div(class="mb-5")
 		form(method="post", action="/search", class="form")
+			input(type="hidden", name="_csrf", value=csrfToken)
 			div(class="input-group input-group-lg")
 				input(type="text", class="form-control form-control-sm", name="query", placeholder="block height/hash, txid, address", value=(query), style="width: 300px;")
 				div(class="input-group-append")

views/terminal.pug

@@ -33,6 +33,8 @@ block content
 
 block endOfBody
 	script.
+		var csrfToken = $('meta[name=csrf-token]').attr('content');
+
 		$(document).ready(function() {
 			$("#terminal-form").submit(function(e) {
 				e.preventDefault();
@@ -41,6 +43,7 @@ block endOfBody
 
 				var postData = {};
 				postData.cmd = cmd;
+				postData._csrf = csrfToken;
 				
 				$.post(
 					"/rpc-terminal",