A client can re-extend up to 3 intro points on the same circuit. This happens
when we get NACKed by the intro point for which we choose a new intro and
re-extend the circuit to it.
That process can be arbitrarly long so reset the dirty timestamp of the
circuit everytime we choose to re-extend so we get a bit more time to actually
do our introduction.
This is a client circuit so it is short live once opened thus giving us a bit
more time to complete the introduction is ok.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Only register the RP circuit when it opens and not when we send the INTRODUCE1
cell else, when re-extending to a new IP, we would register the same RP
circuit with the same cookie twice leading to the circuit being closed.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Changed the assert_intro_circ_ok() to an almost non fatal function so tor can
recover properly. We keep the anonymity assert because if that is not right,
we have much deeper problems and client should stop sending bytes to the
network immediately.
Signed-off-by: David Goulet <dgoulet@torproject.org>
The client needs to find the right intro point object from the circuit
identity digest it is opened to. This new function does that.
Signed-off-by: David Goulet <dgoulet@torproject.org>
When a client decodes a descriptor, make sure it matches the expected blinded
key which is derived from the hidden service identity key.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Needed by the client when fetching a descriptor. This function checks the
directory purpose and hard assert if it is not for fetching.
Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit makes the client use the intro point state cache. It notes down
when we get a NACK from the intro point and then uses that cache to decide if
it should either close the circuits or re-extend to a new intro point.
This also introduces a very useful function that checks if an intro point is
usable that is query the state cache and checks a series of requirement.
Signed-off-by: David Goulet <dgoulet@torproject.org>
This moves it to hs_client.c so it can be used by both system (legacy and
prop224). For now, only the legacy system uses it.
Signed-off-by: David Goulet <dgoulet@torproject.org>
The client can now handle RENDEZVOUS2 cell when they arrive. This consolidate
both hidden service version in one function.
Signed-off-by: David Goulet <dgoulet@torproject.org>
The client is now able to handle an INTRODUCE_ACK cell and do the appropriate
actions.
An intro point failure cache is missing and a way to close all intro point
that were launched in parallel. Some notes are in the comment for that.
Signed-off-by: David Goulet <dgoulet@torproject.org>
From an edge connection object, add a function that randomly pick an
introduction point for the requested service.
This follows the code design of rend_client_get_random_intro() and returns an
extend_info_t object ready to be used to extend to.
At this commit, it is not used yet.
Signed-off-by: David Goulet <dgoulet@torproject.org>
When a descriptor fetch has completed and it has been successfully stored in
the client cache, this callback will take appropriate actions to attach
streams and/or launch neede circuits to connect to the service.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Client now handles a RENDEZVOUS_ESTABLISHED cell when it arrives on the
rendezvous circuit. This new function applies for both the legacy system and
prop224.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Add a function to build the cell.
Add a the logic to send the cell when the rendezvous circuit opens.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Make a single entry point for the entire HS subsystem when a client circuit
opens (every HS version).
Signed-off-by: David Goulet <dgoulet@torproject.org>
Add a function in hs_cell.{c|h} for a client to build an INTRODUCE1 cell using
an object that contains all the needed keys to do so.
Add an entry point in hs_client.c that allows a tor client to send an
INTRODUCE1 cell on a given introduction circuit.
It includes the building of the cell, sending it and the setup of the
rendezvous circuit with the circuit identifier.
The entry point function is still unused at this commit.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Put all the possible assert() we can do on a client introduction circuit in
one helper function to make sure it is valid and usable.
It is disabled for now so gcc doesn't complain that we have a unused function.
Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit paves the way for the e2e circuit unittests.
Add a stub for the prop224 equivalent of rend_client_note_connection_attempt_ended().
That function was needed for tests, since the legacy function would get
called when we attach streams and our client-side tests would crash with
assert failures on rend_data.
This also introduces hs_client.[ch] to the codebase.
