This test is important because it tests that upload_descriptor_to_all()
is in synch with pick_hsdir_v3(). That's not the case for the
reachability test which just compares the responsible hsdir sets.
There was a bug in upload_descriptor_to_all() where we picked between
first and second hsdir index based on which time segment we are. That's
not right and instead we should be uploading our two descriptors using a
different hsdir index every time. That is, upload first descriptor using
first hsdir index, and upload second descriptor using second hdsir index.
Also simplify stuff in pick_hdsir_v3() since that's only used to fetch
descriptors and hence we can just always use the fetch hsdir index.
Because of the latest changes on when we rotate, longer lifetime of
descriptors and no more overlap period, the tests needed to be improved to
test more functionnalities.
Signed-off-by: David Goulet <dgoulet@torproject.org>
First, this fixes#23372.
Second, the consensus timings for the build descriptor have been changed to
the current test can pass. More extensive tests of descriptor rotation are
coming in a commit near you because the rotation and time period logic has
been changed.
Signed-off-by: David Goulet <dgoulet@torproject.org>
This is a large and important unit test for the hidden service version
3! It tests the service reachability for a client using different
consensus timings and makes sure that the computed hashring is the same
on both side so it is actually reachable.
Signed-off-by: David Goulet <dgoulet@torproject.org>
With the latest change on how we use the HSDir index, the client and service
need to pick their responsible HSDir differently that is depending on if they
are before or after a new time period.
The overlap mode is active function has been renamed for this and test added.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Because of #23387, we've realized that there is one scenario that makes
the client unable to reach the service because of a desynch in the time
period used. The scenario is as follows:
+------------------------------------------------------------------+
| |
| 00:00 12:00 00:00 12:00 00:00 12:00 |
| SRV#1 TP#1 SRV#2 TP#2 SRV#3 TP#3 |
| |
| $==========|-----------$===========|-----------$===========| |
| ^ ^ |
| C S |
+------------------------------------------------------------------+
In this scenario the HS has a newer consensus than the client, and the
HS just moved to the next TP but the client is still stuck on the old
one. However, the service is not in any sort of overlap mode so it
doesn't cover the old TP anymore, so the client is unable to fetch a
descriptor.
We've decided to solve this by extending the concept of overlap period
to be permanent so that the service always publishes two descriptors and
aims to cover clients with both older and newer consensuses. See the
spec patch in #23387 for more details.
Based on our #23387 findings, it seems like to maintain 24/7
reachability we need to employ different logic when computing hsdir
indices for fetching vs storing. That's to guarantee that the client
will always fetch the current descriptor, while the service will always
publish two descriptors aiming to cover all possible edge cases.
For more details see the next commit and the spec branch.
Signed-off-by: David Goulet <dgoulet@torproject.org>
The pruning process and the deleting ephemeral service function iterates over
all circuits and were asserting on rend_data for a matching circuit. This is
not good because now we have v3 circuits without a rend_data.
Fixes#23429
Signed-off-by: David Goulet <dgoulet@torproject.org>
Use the valid_after time from the consensus to get the time period number else
we might get out of sync with the overlap period that uses valid_after.
Make it an optional feature since some functions require passing a
specific time (like hs_get_start_time_of_next_time_period()).
Signed-off-by: David Goulet <dgoulet@torproject.org>
Version 3 hidden service needs rendezvous point that have the protocol version
HSRend >= 2 else the rendezvous cells are rejected.
Fixes#23361
Signed-off-by: David Goulet <dgoulet@torproject.org>
There are two reasons this is likeliest to happen -- no kernel
support, and some bug in Tor. We'll ask people to check the former
before they report. Closes 23090.
The chdir() call in RunAsDaemon makes the behavior here surprising,
and either way of trying to resolve the surprise seems sure to
startle a significant fraction of users. Instead, let's refuse to
guess, and refuse these configurations.
Closes ticket 22731.
I'm doing this using the Proxy-Authorization: header to support
clients that understand it, and with a new tor-specific header that
makes more sense for our use.
