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Vendor voku
Package anti-xss
Short Description anti xss-library
License MIT
Homepage https://github.com/voku/anti-xss

Keywords security xss clean anti-xss

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Example code of voku/anti-xss

Informations about the package anti-xss

:secret: AntiXSS

"Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to bypass access controls such as the same origin policy. Cross-site scripting carried out on websites accounted for roughly 84% of all security vulnerabilities documented by Symantec as of 2007." - http://en.wikipedia.org/wiki/Cross-site_scripting

DEMO:

http://anti-xss-demo.suckup.de/

NOTES:

1) Use filter_input() - don't use GLOBAL-Array (e.g. $_SESSION, $_GET, $_POST, $_SERVER) directly

2) Use html-sanitizer or HTML Purifier if you need a more configurable solution

3) Add "Content Security Policy's" -> Introduction to Content Security Policy

4) DO NOT WRITE YOUR OWN REGEX TO PARSE HTML!

5) READ THIS TEXT -> XSS (Cross Site Scripting) Prevention Cheat Sheet

6) TEST THIS TOOL -> Zed Attack Proxy (ZAP)

Install via "composer require"

Usage:

Example 1: (HTML Character)

Example 2: (Hexadecimal HTML Character)

Example 3: (Unicode Hex Character)

Example 4: (Unicode Character)

Example 5.1: (non Inline CSS)

Example 5.2: (with Inline CSS)

Example 6: (check if an string contains a XSS attack)

Example 7: (allow e.g. iframes)

Unit Test:

1) Composer is a prerequisite for running the tests.

2) The tests can be executed by running this command from the root directory:

AntiXss methods

addDoNotCloseHtmlTags	addEvilAttributes	addEvilHtmlTags	addNeverAllowedCallStrings
addNeverAllowedJsCallbackRegex	addNeverAllowedOnEventsAfterwards	addNeverAllowedRegex	addNeverAllowedStrAfterwards
isXssFound	removeDoNotCloseHtmlTags	removeEvilAttributes	removeEvilHtmlTags
removeNeverAllowedCallStrings	removeNeverAllowedJsCallbackRegex	removeNeverAllowedOnEventsAfterwards	removeNeverAllowedRegex
removeNeverAllowedStrAfterwards	setReplacement	setStripe4byteChars	xss_clean

## addDoNotCloseHtmlTags(string[] $strings): $this ↑ Add some strings to the "_do_not_close_html_tags"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## addEvilAttributes(string[] $strings): $this ↑ Add some strings to the "_evil_attributes"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## addEvilHtmlTags(string[] $strings): $this ↑ Add some strings to the "_evil_html_tags"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## addNeverAllowedCallStrings(string[] $strings): $this ↑ Add some strings to the "_never_allowed_call_strings"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## addNeverAllowedJsCallbackRegex(string[] $strings): $this ↑ Add some strings to the "_never_allowed_js_callback_regex"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## addNeverAllowedOnEventsAfterwards(string[] $strings): $this ↑ Add some strings to the "_never_allowed_on_events_afterwards"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## addNeverAllowedRegex(string[] $strings): $this ↑ Add some strings to the "_never_allowed_regex"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## addNeverAllowedStrAfterwards(string[] $strings): $this ↑ Add some strings to the "_never_allowed_str_afterwards"-array. **Parameters:** - `string[] $strings` **Return:** - `$this` -------- ## isXssFound(): bool|null ↑ Check if the "AntiXSS->xss_clean()"-method found an XSS attack in the last run. **Parameters:** __nothing__ **Return:** - `bool|null

Will return null if the "xss_clean()" wasn't running at all.

` -------- ## removeDoNotCloseHtmlTags(string[] $strings): $this ↑ Remove some strings from the "_do_not_close_html_tags"-array.