David Goulet [Thu, 17 Sep 2020 16:55:40 +0000 (12:55 -0400)]
test: Increment rend cache allocation before freeing
The rend_cache/entry_free was missing the rend cache allocation increment
before freeing the object.
Without it, it had an underflow bug:
Sep 17 08:40:13.845 [warn] rend_cache_decrement_allocation(): Bug: Underflow
in rend_cache_decrement_allocation (on Tor 0.4.5.0-alpha-dev 7eef9ced61e72b1d)
Fixes #40125
Signed-off-by: David Goulet <dgoulet@torproject.org>
statistics: Properly count all rendezvous cells (avoid undercounting).
tl;dr We were not counting cells flying from the client to the service, but we
were counting cells flying from the service to the client.
When a rendezvous cell arrives from the client to the RP, the RP forwards it to
the service.
For this to happen, the cell first passes through command_process_relay_cell()
which normally does the statistics counting. However because the `rend_circ`
circuit was not flagged with `circuit_carries_hs_traffic_stats` in
rend_mid_rendezvous(), the cell is not counted there.
Then the cell goes to circuit_receive_relay_cell() which has a special code
block based on `rend_splice` specifically for rendezvous cells, and the cell
gets directly passed to `rend_circ` via a direct call to
circuit_receive_relay_cell(). The cell never passes through
command_process_relay_cell() ever again and hence is never counted by our
rephist module.
The fix here is to flag the `rend_circ` circuit with
`circuit_carries_hs_traffic_stats` so that the cell is counted as soon as it
hits command_process_relay_cell().
Furthermore we avoid double-counting cells since the special code block of
circuit_receive_relay_cell() makes us count rendezvous cells only as they enter
the RP and not as they exit it.
David Goulet [Wed, 19 Aug 2020 13:47:34 +0000 (09:47 -0400)]
hs: Don't overwrite DoS parameters on circuit with consensus params
Turns out that the HS DoS defenses parameters were overwritten by the
consensus parameters everytime a new consensus would arrive.
This means that a service operator can still enable the defenses but as soon
as the intro point relay would get a new consensus, they would be overwritten.
And at this commit, the network is entirely disabling DoS defenses.
Fix this by introducing an "explicit" flag that indicate if the
ESTABLISH_INTRO cell DoS extension set those parameters or not. If set, avoid
using the consenus at once.
We are not bumping the protover HSIntro value for this because 0.4.2.x series
is EOL in 1 month and thus 0.4.3.x would be the only series with this bug. We
are confident that a backport and then upgrade path to the latest 0.4.4.x
stable coming up soon is enough to mitigate this problem in the coming months.
It avoids the upgrade path on the service side by keeping the requirement for
protover HSIntro=5.
Fixes #40109
Signed-off-by: David Goulet <dgoulet@torproject.org>
Nick Mathewson [Wed, 12 Aug 2020 16:36:54 +0000 (12:36 -0400)]
Parallelize src/test/test into chunks.
First, we introduce a flag to teach src/test/test to split its work
into chunks. Then we replace our invocation of src/test/test in our
"make check" target with a set of 8 scripts that invoke the first
8th of the tests, the second 8th, and so on.
This change makes our "make -kj4 check" target in our hardened
gitlab build more than twice as fast, since src/test/test was taking
the longest to finish.
Nick Mathewson [Mon, 3 Aug 2020 15:25:37 +0000 (11:25 -0400)]
Remove channel_is_canonical_is_reliable()
This function once served to let circuits continue to be built over
version-1 link connections. But such connections are long-obsolete,
and it's time to remove this check.
Nick Mathewson [Thu, 30 Jul 2020 18:24:25 +0000 (14:24 -0400)]
Fix a bug in buf_move_all() when the input buffer is empty.
We found this in #40076, after we started using buf_move_all() in
more places. Fixes bug #40076; bugfix on 0.3.3.1-alpha. As far as
I know, the crash only affects master, but I think this warrants a
backport, "just in case".
projects / thirdparty / tor.git / log
