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Filename: 150-exclude-exit-nodes.txt
Title: Exclude Exit Nodes from a circuit
Author: Mfr
Created: 2008-06-15
Status: Closed
Implemented-In: 0.2.1.3-alpha
Overview
Right now, Tor users can manually exclude a node from all positions
in their circuits created using the directive ExcludeNodes.
This proposal makes this exclusion less restrictive, allowing users to
exclude a node only from the exit part of a circuit.
Motivation
This feature would Help the integration into vidalia (tor exit
branch) or other tools, of features to exclude a country for exit
without reducing circuits possibilities, and privacy. This feature
could help people from a country were many sites are blocked to
exclude this country for browsing, giving them a more stable
navigation. It could also add the possibility for the user to
exclude a currently used exit node.
Implementation
ExcludeExitNodes is similar to ExcludeNodes except it's only
the exit node which is excluded for circuit build.
Tor doesn't warn if node from this list is not an exit node.
Security implications:
Open also possibilities for a future user bad exit reporting
Risks:
Use of this option can make users partitionable under certain attack
assumptions. However, ExitNodes already creates this possibility,
so there isn't much increased risk in ExcludeExitNodes.
We should still encourage people who exclude an exit node because
of bad behavior to report it instead of just adding it to their
ExcludeExit list. It would be unfortunate if we didn't find out
about broken exits because of this option. This issue can probably
be addressed sufficiently with documentation.
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