Skip to content

Update index.js #2

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
AlirezaEbrahimkhani wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Update index.js #2

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
6e513d6
[Refactor] replace all regex with correct regex string definition
AlirezaEbrahimkhani Dec 27, 2021
15d08d8
[Feat] isNullAndUndefined method implemented to make code cleaner and…
AlirezaEbrahimkhani Dec 27, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
29 changes: 19 additions & 10 deletions lib/index.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
var rawbody = require('raw-body');
const rawbody = require('raw-body');

function hasSql(value) {

Expand All @@ -7,35 +7,43 @@ function hasSql(value) {
}

// sql regex reference: http://www.symantec.com/connect/articles/detection-sql-injection-and-cross-site-scripting-attacks
var sql_meta = new RegExp('(%27)|(\')|(--)|(%23)|(#)', 'i');
var sql_meta = new RegExp(/(%27)|(\')|(--)|(%23)|(#)/, 'i');
if(sql_meta.test(value)){
return true;
}

var sql_meta2 = new RegExp('((%3D)|(=))[^\n]*((%27)|(\')|(--)|(%3B)|(;))', 'i');
var sql_meta2 = new RegExp(/((%3D)|(=))[^\n]*((%27)|(\')|(--)|(%3B)|(;))/, 'i');
if(sql_meta2.test(value)){
return true;
}

var sql_typical = new RegExp('w*((%27)|(\'))((%6F)|o|(%4F))((%72)|r|(%52))', 'i');
var sql_typical = new RegExp(/w*((%27)|(\'))((%6F)|o|(%4F))((%72)|r|(%52))/, 'i');
if(sql_typical.test(value)){
return true;
}

var sql_union = new RegExp('((%27)|(\'))union', 'i');
var sql_union = new RegExp(/((%27)|(\'))union/, 'i');
if(sql_union.test(value)){
return true;
}

return false;
}

function isNullAndUndefined(value) {
if(value === null && value === undefined) {
return true;
}

return false;
}

function middleware(req, res, next) {

var containsSql = false;

if (req.originalUrl !== null && req.originalUrl !== undefined) {
if (hasSql(req.originalUrl) === true) {
if (!isNullAndUndefined(req.originalUrl)) {
if (hasSql(req.originalUrl)) {
containsSql = true;
}
}
Expand All @@ -49,18 +57,18 @@ function middleware(req, res, next) {
return next(err);
}

if (body !== null && body !== undefined) {
if (!isNullAndUndefined(body)) {

if (typeof body !== 'string') {
body = JSON.stringify(body);
}

if (hasSql(body) === true) {
if (hasSql(body)) {
containsSql = true;
}
}

if (containsSql === true) {
if (containsSql) {
res.send(403);
}
else {
Expand All @@ -72,4 +80,5 @@ function middleware(req, res, next) {
}
}


module.exports = middleware;