/techdocs/html_escape.txt (54ac7d4c954c3031d8149c802b87467b6619afa0) (1752 bytes) (mode 100644) (type blob)
The whole HTML encoding is a mess!
We have the following functions:
- htmlspecialchars &"'<> -> & " ' < >
- htmlentities htmlspecialchars + (è -> è) & co. Not used
- rawurlencode [^-_.~0-9a-zA-Z] -> %xx
- urlencode [^-_.0-9a-zA-Z] -> %xx + ' ' -> '+' Not used
We have the following RG things:
URL_ESCAPE: [rawurlencode()]
HTML_SPECIAL: [htmlspecialchars()]
What is the difference between @@URL_ESCAPE:var@@ and @@var@@? None.
We have the following cases:
- <a href="case1">case2</a>
- <a href="javascript:alert(document.cookie)">
Fix: be sure the above is not alone inside '"'.
- <a href="http://bla?x=1&2"> - we want x to be sent as '1&2', not '1'.
- <input ... value="untrusted"> - #2 - quote ' and "
- <a href="bla?value=UNTRUSTED"> - #5 - rawurlencode
- <bla>UNTRUSTED</bla> - #1 - htmlspecialchars
Dangers:
- XSS
- an var 'a/b/c' in context X/@@var@@/Y encoded as X/a/b/c/Y'.
- var='">danger<"'; string: '<a href="bla@@var@@">'
Info:
- https://stackoverflow.com/questions/4782988/url-html-escaping-encoding
They say, inside 'href' to use htmlspecialchars('?a=' . urlencode('b')).
Basically, only '&' is encoded by 'htmlspecialchars'.
For the rest of the cases, use 'htmlspecialchars'.
- https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html
Plan:
- @@var@@ should call htmlspecialchars - we assume that the majority of
the cases are things outside html tags (<>). [HTML Body]
So HTML_SPECIAL: will go.
- For URLs we have two cases:
- we want a path, so '/' must be escaped - need to find where I use this
- we have a file name and we do not want '/' to be escaped
@@URL_ESCAPE:var@@ [rawurlencode]
- What about 'ș' in URLs?
- What to do with rg_xss_safe()?
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