Docs say that $tls_sni has raw data from client:

"Great care should be taken to deal with matters of case, various injection
attacks in the string (../ or SQL), and ensuring that a valid filename can
always be referenced; it is important to remember that $tls_sni is arbitrary
unverified data provided prior to authentication."

What is safest approach to handle $tls_sni when trying
to expand it to file on filesystem?

Rule like:

Arkadiusz Miśkiewicz, arekm / ( maven.pl | pld-linux.org )

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