Currently test the only available function which is hs_dos_can_send_intro2()
within the HS anti-DoS subsystem.
Closes#15516
Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit add the hs_dos.{c|h} file that has the purpose of having the
anti-DoS code for onion services.
At this commit, it only has one which is a function that decides if an
INTRODUCE2 can be sent on the given introduction service circuit (S<->IP)
using a simple token bucket.
The rate per second is 25 and allowed burst to 200.
Basic defenses on #15516.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Padding circuits were regular cells that got closed before their padding
machine could finish. This means that they can still receive regular cells from
their past life, but they have no way or reason to answer them anymore. Hence
let's ignore them before they even get to the proper subsystems.
Padding circuits were regular cells that got closed before their padding
machine could finish. This means that they can still receive regular cells from
their past life, but they have no way or reason to answer them anymore. Hence
let's ignore them before they even get to the proper subsystems.
This test runs practracker with a set of 0 thresholds, to make sure
that it enumerates all its values right. It tries running with an
empty exceptions file, and with an exceptions file that covers
_some_ of the data, and it makes sure that the outputs are as expected.
Now that there is only one toplevel place where we print problems,
we can redirect just that one print to a file when we are
regenerating the exceptions.txt file. Previously we redirected
sys.stdout, which is naughty, and forced us to send warnings (and
warnings alone) to stderr.
These flags let you suppress the message about the number of
problems and warnings, and let you control the thresholds above
which something counts as a problem.
I need this for testing.
Instead of having "consider" functions that have to call a global
ProblemVault, we can now generate all the metrics for the code
separately from the decision about what to do for them.
I'm about to refactor the code into a set of iterators that yield
*all* the metrics for the code, and then add a filter on top of that
to return the problems.
This shouldn't be possible while Tor is running, but the tests can
hit this code. Rather than force the tests to add a dummy channel
object, let's just tolerate their incompletely built circuits.
David Goulet
George Kadianakis
Nick Mathewson