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h2: Add a rate limit facility for h/2 RST handling ("Rapid reset" mitigation) #3997

Merged
merged 3 commits into from
Oct 17, 2023
Merged

h2: Add a rate limit facility for h/2 RST handling ("Rapid reset" mitigation) #3997

merged 3 commits into from
Oct 17, 2023

Commits on Oct 17, 2023

  1. h2: Add a rate limit facility for h/2 RST handling 

    This adds parameters h2_rst_allowance and h2_rst_allowance_period,
which govern the rate of which we allow clients to reset h/2 streams.

If the limit is exceeded the connection is closed.

Mitigates: varnishcache#3996
    @daghf
    daghf committed Oct 17, 2023
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  2. Introduce RAPID_RESET as a sess_close reason

    @daghf
    daghf committed Oct 17, 2023
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  3. Add param h2_rapid_reset 

    Only RST frames received earlier than this duration will be considered
rapid.
    @daghf
    daghf committed Oct 17, 2023
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