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- o Major features and bugfixes (node selection)
-
- - Revise and unify the meaning of the ExitNodes, EntryNodes,
- ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and
- StrictNodes options. Previously, we had been ambiguous in
- describing what counted as an "exit" node, and what operations
- exactly "StrictNodes 0" would permit. This created confusion
- when people saw nodes built through unexpected circuits, and
- made it hard to tell real bugs from surprises. We now stipulate
- that the intended behavior is:
-
- . "Exit", in the context of ExitNodes and ExcludeExitNodes,
- means a node that delivers user traffic outside the Tor
- network.
- . "Entry", in the context of EntryNodes and ExcludeEntryNodes,
- means a node used as the first hop of a multihop circuit:
- it doesn't include direct connections to directory servers.
- . "ExcludeNodes" applies to all nodes.
- . "StrictNodes" changes the behavior of ExcludeNodes only.
- When StrictNodes is set, Tor should avoid all nodes listed
- in ExcludeNodes, even when it will make user requests
- fail. When StrictNodes is *not* set, then Tor should
- follow ExcludeNodes whenever it can, except when it must
- use an excluded node to perform self-tests, connect to a
- hidden service, provide a hidden service, fulfill a .exit
- request, upload directory information, or fetch directory
- information.
-
- Collectively, the changes to implement the behavior are a fix for
- bug 1090.
-
- - ExcludeNodes now takes precedence over EntryNodes and ExitNodes:
- if a node is listed in both, it's treated as excluded.
-
- - ExcludeNodes now applies to directory nodes: as a preference if
- StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
- (Don't exclude all the directory authorities and set StrictNodes
- to 1 unless you really want your Tor to break.)
-
- - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
-
- - ExcludeExitNodes now overrides .exit requests.
-
- - We don't use bridges from ExcludeNodes.
-
- - When StrictNodes is 1:
- . We now apply ExcludeNodes to hidden service introduction points
- and to rendezvous points selected by hidden service users.
- This can make your hidden service less reliable: use it with
- caution!
- . If we have used ExcludeNodes on ourself, do not try self-tests.
- . If we have excluded all the directory authorities, we will
- not even try to upload our descriptor if we're a server.
- . Do not honor .exit requests to an excluded node.
-
- - Remove a misfeature that caused us to ignore the Fast/Stable flags
- if ExitNodes was set. Bugfix on 0.2.2.7-alpha.
-
- - When the set of permitted nodes changes, we now remove any
- mappings introduced via TrackExitHosts to now-excluded nodes.
- Bugfix on 0.1.0.1-rc.
-
- - We never cannibalize a circuit that had excluded nodes on it,
- even if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
-
- - Improve log messages related to excluded nodes.
-
- - Revert a change where we would be laxer about attaching streams to
- circuits than when building the circuits. This was meant to
- prevent a set of bugs where streams were never attachable, but our
- improved code here should make this unnecessary. Bugfix on
- 0.2.2.7-alpha.
-