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Re: So, now what are taints?

by graff (Chancellor)
on Mar 29, 2004 at 02:32 UTC ( #340485=note: print w/replies, xml ) Need Help??

in reply to So, now what are taints?

It might clarify the idea if you rephrase the question as "what is tainted data?" Data should be considered "tainted" when it comes from a source outside the direct control and complete trust of your system and perl script, such as parameters being submitted on a web form from a remote client, or data coming through a port or socket from a remote host, or data in a file that has global write access.

"Taint" mode in perl is a method of making sure that "tainted data" is officially "quarantined", and is not allowed to be involved in any operation where it could cause damage (whether malicious or simply accidental), such as being used as part of a command line for a sub-shell, or part of an SQL statement passed to a database server, or executed as part of an "eval" block.

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[LanX]: two utf8 strings from different sources are base64 encoded, but after joining both the umlauts in teh second get deleted
[Corion]: LanX: You can't just join two base64 strings together
[LanX]: (not a high priority bug because I can use some HTML entities in the second string)
[Corion]: base64 is padded to a multiple of 4 chars (or something)
[LanX]: misunderstanding, I joined them before converting to base64
[Corion]: Also, I would be wary of encodings and try to make really sure that both input strings are UTF-8. Maybe join the input strings from one source together to see whether they decode as bad or not
[Corion]: LanX: Then the problem should persist without encoding to base64 too ;)
[LanX]: I think it's a flag problem ... I'll produce a reprodocable example for SOPW
[Corion]: "flag problem" to me sounds like "contains UTF-8 bytes but was never properly decoded to an UTF-8 string"

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