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GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.

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  • #25903

Closed (moved)
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Opened Apr 23, 2018 by Mike Perry@mikeperry

Add OVERHEAD and DELIVERED fields to CIRC_BW events

I want to have information about how much data is actually for applications, so that external controllers can check for circuit side channel attacks.

To do this, I want to add two fields to CIRC_BW events: a PACKAGED field that reports the sum of all rh.length values for all relay cells, and a DELIVERED field that reports the sum of all rh.length for valid RELAY_DATA cells.

That way, controllers can check for large differences between PACKAGED and DELIVERED, to see if lots of data is being sent on a circuit that is getting silently dropped. They can also check for differences between the raw CIRC_BW value and DELIVERED, to see if an adversary is underfilling cells (though this may be far more prone to false positives).

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Tor: 0.3.4.x-final
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Tor: 0.3.4.x-final
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Reference: legacy/trac#25903