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sanitizer_test.go
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package htmlsanitizer_test
import (
"bytes"
"fmt"
"io"
"net/url"
"strings"
"testing"
"github.com/sym01/htmlsanitizer"
)
func ExampleNewWriter() {
// demo data
data := strings.Repeat(`abc-->
<a href="javascript:alert(1)">link1</a>
<a href=http://example.com>link2<script>xxx</script></a>
<!--`, 1024)
expected := "abc-->" + strings.Repeat(`
<a>link1</a>
<a href="http://example.com">link2</a>
`, 1024)
// underlying writer for demo
o := new(bytes.Buffer)
// source reader for demo
r := bytes.NewBufferString(data)
sanitizedWriter := htmlsanitizer.NewWriter(o)
_, _ = io.Copy(sanitizedWriter, r)
// check the result, for demo only
fmt.Print(o.String() == expected)
// Output:
// true
}
func ExampleHTMLSanitizer_keepStyleSheet() {
sanitizer := htmlsanitizer.NewHTMLSanitizer()
sanitizer.AllowList.Tags = append(sanitizer.AllowList.Tags,
&htmlsanitizer.Tag{Name: "style"},
&htmlsanitizer.Tag{Name: "head"},
&htmlsanitizer.Tag{Name: "body"},
&htmlsanitizer.Tag{Name: "html"},
)
data := `<!doctype html>
<html>
<head>
<style type="text/css">
body {
background-color: #f0f0f2;
margin: 0;
padding: 0;
bad-attr: <body></body>;
bad-attr: <body></body >;
bad-attr: <body></ body>;
font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
}
</style>
</head>
<body>
<div>
<h1>Example Domain</h1>
<p><a href="https://www.iana.org/domains/example">More information...</a></p>
</div>
</body>
</html>`
output, _ := sanitizer.SanitizeString(data)
fmt.Print(output)
// Output:
//
// <html>
// <head>
// <style>
// body {
// background-color: #f0f0f2;
// margin: 0;
// padding: 0;
// bad-attr: <body></body>;
// bad-attr: <body></body >;
// bad-attr: <body></ body>;
// font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
// }
// </style>
// </head>
// <body>
// <div>
// <h1>Example Domain</h1>
// <p><a href="https://www.iana.org/domains/example">More information...</a></p>
// </div>
// </body>
// </html>
}
func ExampleHTMLSanitizer_noTagsAllowed() {
sanitizer := htmlsanitizer.NewHTMLSanitizer()
// just set AllowList to nil to disable all tags
sanitizer.AllowList = nil
// of course nothing will happen here
sanitizer.RemoveTag("a")
data := `
<a href="http://others.com">Link</a>
<a href="https://example.com/xxx">Link with example.com</a>
`
output, _ := sanitizer.SanitizeString(data)
fmt.Print(output)
// Output:
//
// Link
// Link with example.com
}
func ExampleHTMLSanitizer_onlyAllowHrefTag() {
sanitizer := htmlsanitizer.NewHTMLSanitizer()
sanitizer.AllowList.Tags = []*htmlsanitizer.Tag{
{"a", nil, []string{"href"}},
}
data := `
<details/open/ontoggle=alert(1)></details>
<a href="http://others.com" target="_blank">Link</a>
<a href="https://example.com/xxx">Link with example.com</a>
`
output, _ := sanitizer.SanitizeString(data)
fmt.Print(output)
// Output:
//
// <a href="http://others.com">Link</a>
// <a href="https://example.com/xxx">Link with example.com</a>
}
func ExampleHTMLSanitizer_customURLSanitizer() {
// only links with domain name example.com are allowed.
sanitizer := htmlsanitizer.NewHTMLSanitizer()
sanitizer.URLSanitizer = func(rawURL string) (newURL string, ok bool) {
newURL, ok = htmlsanitizer.DefaultURLSanitizer(rawURL)
if !ok {
return
}
u, err := url.Parse(newURL)
if err != nil {
ok = false
return
}
if u.Host == "example.com" {
ok = true
return
}
ok = false
return
}
data := `
<a href="http://others.com">Link</a>
<a href="https://example.com/xxx">Link with example.com</a>
`
output, _ := sanitizer.SanitizeString(data)
fmt.Print(output)
// Output:
//
// <a>Link</a>
// <a href="https://example.com/xxx">Link with example.com</a>
}
func TestSanitize(t *testing.T) {
data := []byte(`<a class=x id= 123 href="javascript:alert(1)">demo</a>`)
expected := []byte(`<a class="x" id="123">demo</a>`)
ret, err := htmlsanitizer.Sanitize(data)
if err != nil {
t.Errorf("unable to Sanitize err: %s", err)
return
}
if !bytes.Equal(ret, expected) {
t.Errorf("test failed for %s, expect %s, got %s", data, expected, ret)
return
}
}
func TestSanitizeString(t *testing.T) {
for _, item := range testCases {
ret, err := htmlsanitizer.SanitizeString(item.in)
if err != nil {
t.Errorf("unable to SanitizeString(%#v) err: %s", item.in, err)
break
}
if ret != item.out {
t.Errorf("test failed for %#v, expect %#v, got %#v", item.in, item.out, ret)
break
}
}
}
var testCases = []struct {
in string
out string
}{
{
in: `<a class="'<>" rel='aaa"'>test</a>`,
out: "<a class=\"'<>\" rel=\"aaa"\">test</a>",
},
{
in: `<a href="ftp://example.com/xxx">test</a xxx>`,
out: "<a>test</a>",
},
{
in: `<audio autoplay class=x>`,
out: "<audio autoplay class=\"x\">",
},
{
in: `<audio autoplay />`,
out: "<audio autoplay />",
},
{
in: `<audio autoplay/class="a">`,
out: "<audio autoplay class=\"a\">",
},
{
in: `<span class=>`,
out: "<span class=\"\">",
},
{
in: `<span`,
out: "",
},
{
in: `</span`,
out: "",
},
{
in: `<span class`,
out: "",
},
{
in: `</span class`,
out: "",
},
{
in: `<span class `,
out: "",
},
{
in: `<span class= `,
out: "",
},
{
in: `<span class=" `,
out: "",
},
{
in: `<span class= >`,
out: "<span class=\"\">",
},
{
in: `<span class= />`,
out: "<span class=\"/\">",
},
{
in: `<span class = abc`,
out: "",
},
{
in: `<span class = a>`,
out: "<span class=\"a\">",
},
{
in: `<//>`,
out: "",
},
{
in: `<//`,
out: "",
},
// test cases from https://owasp.org/www-community/xss-filter-evasion-cheatsheet
{
in: `<SCRIPT SRC=http://xss.rocks/xss.js></SCRIPT xxx>`,
out: ``,
},
{
in: `javascript:/*--></title></style></textarea></script></xmp><svg/onload='+/"/+/onmouseover=1/+/[*/[]/+alert(1)//'>`,
out: `javascript:/*-->`,
},
{
in: `<IMG SRC="javascript:alert('XSS');">`,
out: `<img>`,
},
{
in: `<IMG SRC=javascript:alert('XSS')>`,
out: `<img>`,
},
{
in: `<IMG SRC=JaVaScRiPt:alert('XSS')>`,
out: `<img>`,
},
{
in: `<IMG SRC=javascript:alert("XSS")>`,
out: `<img>`,
},
{
in: "<IMG SRC=`javascript:alert(\"RSnake says, 'XSS'\")`>",
out: `<img>`,
},
{
in: `\<a onmouseover="alert(document.cookie)"\>xxs link\</a\>`,
out: `\<a>xxs link\</a>`,
},
{
in: `\<a onmouseover=alert(document.cookie)\>xxs link\</a\>`,
out: `\<a>xxs link\</a>`,
},
{
in: `<IMG """><SCRIPT>alert("XSS")</SCRIPT>"\>`,
out: `<img>"\>`,
},
{
in: `<IMG SRC=javascript:alert(String.fromCharCode(88,83,83))>`,
out: `<img>`,
},
{
in: `<IMG SRC=#abc onmouseover="alert('xxs')">`,
out: `<img src="#abc">`,
},
{
in: `<IMG SRC= onmouseover="alert('xxs')">`,
out: `<img src="onmouseover=%22alert%28%27xxs%27%29%22">`,
},
{
in: `<IMG onmouseover="alert('xxs')">`,
out: `<img>`,
},
{
in: `<IMG SRC=/ onerror="alert(String.fromCharCode(88,83,83))"></img>`,
out: "<img src=\"/\"></img>",
},
{
in: `<img src=x onerror="javascript:alert('XSS')">`,
out: "<img src=\"x\">",
},
{
in: `<IMG SRC=javascript:alert('XSS')>`,
out: `<img>`,
},
{
in: `<IMG SRC=javascript:alert('XSS')>`,
out: `<img>`,
},
{
in: `<IMG SRC=javascript:alert('XSS')>`,
out: `<img>`,
},
{
in: `<IMG SRC="jav ascript:alert('XSS');">`,
out: `<img>`,
},
{
in: `<IMG SRC="jav	ascript:alert('XSS');">`,
out: `<img>`,
},
{
in: `<IMG SRC="jav
ascript:alert('XSS');">`,
out: `<img>`,
},
{
in: `<IMG SRC="jav
ascript:alert('XSS');">`,
out: `<img>`,
},
{
in: "<IMG SRC=java\x00script:alert(\"XSS\")>",
out: `<img>`,
},
{
in: `<IMG SRC="  javascript:alert('XSS');">`,
out: `<img>`,
},
{
in: `<SCRIPT/XSS SRC="http://xss.rocks/xss.js"></SCRIPT>`,
out: ``,
},
{
in: "<BODY onload!#$%&()*~+-_.,:;?@[/|\\]^`=alert(\"XSS\")>",
out: ``,
},
{
in: `<SCRIPT/SRC="http://xss.rocks/xss.js"></SCRIPT>`,
out: ``,
},
{
in: `<<SCRIPT>alert("XSS");//\<</SCRIPT>`,
out: `alert("XSS");//\`,
},
{
in: `<SCRIPT SRC=http://xss.rocks/xss.js?< B >`,
out: ``,
},
{
in: "<IMG SRC=\"`<javascript:alert>`('XSS')\">",
out: `<img>`,
},
{
in: `<iframe src=http://xss.rocks/scriptlet.html <`,
out: ``,
},
{
in: `<INPUT TYPE="IMAGE" SRC="javascript:alert('XSS');">`,
out: ``,
},
{
in: `<IMG DYNSRC="javascript:alert('XSS')">`,
out: `<img>`,
},
{
in: `<IMG LOWSRC="javascript:alert('XSS')">`,
out: `<img>`,
},
{
in: `<STYLE>li {list-style-image: url("javascript:alert('XSS')");}</STYLE><UL><LI>XSS</br>`,
out: "<ul><li>XSS</br>",
},
{
in: `<STYLE>li {list-style-image: url("javascript:alert('XSS')");}`,
out: "",
},
{
in: `<svg/onload=alert('XSS')>`,
out: ``,
},
{
in: `<BR SIZE="&{alert('XSS')}">`,
out: `<br>`,
},
{
in: `<LINK REL="stylesheet" HREF="http://xss.rocks/xss.css">`,
out: ``,
},
{
in: `<IMG STYLE="xss:expr/*XSS*/ession(alert('XSS'))">`,
out: `<img>`,
},
{
in: `<XSS STYLE="xss:expression(alert('XSS'))">`,
out: ``,
},
{
in: `¼script¾alert(¢XSS¢)¼/script¾`,
out: `¼script¾alert(¢XSS¢)¼/script¾`,
},
{
in: `<IFRAME SRC="javascript:alert('XSS');"></IFRAME>`,
out: ``,
},
{
in: `<IFRAME SRC=# onmouseover="alert(document.cookie)"></IFRAME>`,
out: ``,
},
{
in: `<!--[if gte IE 4]>
<SCRIPT>alert('XSS');</SCRIPT>
<![endif]-->`,
out: `
`,
},
{
in: `<BASE HREF="javascript:alert('XSS');//">`,
out: ``,
},
{
in: `<OBJECT TYPE="text/x-scriptlet" DATA="http://xss.rocks/scriptlet.html"></OBJECT>`,
out: ``,
},
{
in: `<EMBED SRC="data:image/svg+xml;base64,PHN2ZyB4bWxuczpzdmc9Imh0dH A6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcv MjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hs aW5rIiB2ZXJzaW9uPSIxLjAiIHg9IjAiIHk9IjAiIHdpZHRoPSIxOTQiIGhlaWdodD0iMjAw IiBpZD0ieHNzIj48c2NyaXB0IHR5cGU9InRleHQvZWNtYXNjcmlwdCI+YWxlcnQoIlh TUyIpOzwvc2NyaXB0Pjwvc3ZnPg==" type="image/svg+xml" AllowScriptAccess="always"></EMBED>`,
out: ``,
},
{
in: `<SCRIPT a=">" SRC="httx://xss.rocks/xss.js"></SCRIPT>`,
out: ``,
},
{
in: `<SCRIPT =">" SRC="httx://xss.rocks/xss.js"></SCRIPT>`,
out: "",
},
{
in: `<A HREF="http://66.102.7.147/">XSS</A>`,
out: "<a href=\"http://66.102.7.147/\">XSS</a>",
},
{
in: `<A HREF="http://%77%77%77%2E%67%6F%6F%67%6C%65%2E%63%6F%6D">XSS</A>`,
out: `<a>XSS</a>`,
},
{
in: `<A HREF="h
tt p://6 6.000146.0x7.147/">XSS</A>`,
out: `<a>XSS</a>`,
},
{
in: `<A HREF="javascript:document.location='http://www.google.com/'">XSS</A>`,
out: `<a>XSS</a>`,
},
{
in: `<span>func <a class= "Documentation-source" href="https://cs.opensource.google/go/go/+/go1.21.5:src/os/path.go;l=66">RemoveAll</a> <a class="Documentation-idLink" href="#RemoveAll" aria-label="Go to RemoveAll">¶</a></span>`,
out: `<span>func <a class="Documentation-source" href="https://cs.opensource.google/go/go/+/go1.21.5:src/os/path.go;l=66">RemoveAll</a> <a class="Documentation-idLink" href="#RemoveAll">¶</a></span>`,
},
{
in: `
<Img src = x onerror = "javascript: window.onerror = alert; throw XSS">
<Video> <source onerror = "javascript: alert (XSS)">
<Input value = "XSS" type = text>
<applet code="javascript:confirm(document.cookie);">
<isindex x="javascript:" onmouseover="alert(XSS)">
"></SCRIPT>”>’><SCRIPT>alert(String.fromCharCode(88,83,83))</SCRIPT>
"><img src="x:x" onerror="alert(XSS)">
"><iframe src="javascript:alert(XSS)">
<object data="javascript:alert(XSS)" />
<isindex type=image src=1 onerror=alert(XSS)>
<img src=x:alert(alt) onerror=eval(src) alt=0>
<img src="x:gif" onerror="window['al\u0065rt'](0)"></img>
<iframe/src="data:text/html,<svg onload=alert(1)>">
<meta content="
 1 
; JAVASCRIPT: alert(1)" http-equiv="refresh"/>
<svg><script xlink:href=data:,window.open('https://www.google.com/')></script
<meta http-equiv="refresh" content="0;url=javascript:confirm(1)">
<iframe src=javascript:alert(document.location)>
<form><a href="javascript:\u0061lert(1)">X
</script><img/*%00/src="worksinchrome:prompt(1)"/%00*/onerror='eval(src)'>
<style>//*{x:expression(alert(/xss/))}//<style></style>
On Mouse Over
<img src="/" =_=" title="onerror='prompt(1)'">
<a aa aaa aaaa aaaaa aaaaaa aaaaaaa aaaaaaaa aaaaaaaaa aaaaaaaaaa href=javascript:alert(1)>ClickMe
<script x> alert(1) </script 1=2
<form><button formaction=javascript:alert(1)>CLICKME
<input/onmouseover="javaSCRIPT:confirm(1)"
<iframe src="data:text/html,%3C%73%63%72%69%70%74%3E%61%6C%65%72%74%28%31%29%3C%2F%73%63%72%69%70%74%3E"></iframe>
<OBJECT CLASSID="clsid:333C7BC4-460F-11D0-BC04-0080C7055A83"><PARAM NAME="DataURL" VALUE="javascript:alert(1)"></OBJECT>
`,
out: `
<img src="x">
<video> <source>
">”>’>
"><img>
">
<img alt="0">
<img></img>
<a>X
<img>
On Mouse Over
<img src="/">
<a>ClickMe
CLICKME
`,
},
}