curl_httpclient,http1connection: Prohibit CR and LF in headers #3386
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libcurl does not check for CR and LF in headers, making this the application's responsibility. However, Tornado's other HTTP interfaces check for linefeeds so we should do the same here so that switching between the simple and curl http clients does not introduce header injection vulnerabilties. http1connection previously checked only for LF in headers (alone or in a CRLF pair). It now prohibits bare CR as well, following the requirement in RFC 9112.
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libcurl does not check for CR and LF in headers, making this the application's responsibility. However, Tornado's other HTTP interfaces check for linefeeds so we should do the same here so that switching between the simple and curl http clients does not introduce header injection vulnerabilties.
http1connection previously checked only for LF in headers (alone or in a CRLF pair). It now prohibits bare CR as well, following the requirement in RFC 9112.