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This started as a response to ticket #40792 where Coverity is
complaining about a potential year 2038 bug where we cast time_t from
approx_time() to uint32_t for use in token_bucket_ctr.
There was a larger can of worms though, since token_bucket really
doesn't want to be using wallclock time here. I audited the call sites
for approx_time() and changed any that used a 32-bit cast or made
inappropriate use of wallclock time. Things like certificate lifetime,
consensus intervals, etc. need wallclock time. Measurements of rates
over time, however, are better served with a monotonic timer that does
not try and sync with wallclock ever.
Looking closer at token_bucket, its design is a bit odd because it was
initially intended for use with tick units but later forked into
token_bucket_rw which uses ticks to count bytes per second, and
token_bucket_ctr which uses seconds to count slower events. The rates
represented by either token bucket can't be lower than 1 per second, so
the slower timer in 'ctr' is necessary to represent the slower rates of
things like connections or introduction packets or rendezvous attempts.
I considered modifying token_bucket to use 64-bit timestamps overall
instead of 32-bit, but that seemed like an unnecessarily invasive change
that would grant some peace of mind but probably not help much. I was
more interested in removing the dependency on wallclock time. The
token_bucket_rw timer already uses monotonic time. This patch converts
token_bucket_ctr to use monotonic time as well. It introduces a new
monotime_coarse_absolute_sec(), which is currently the same as nsec
divided by a billion but could be optimized easily if we ever need to.
This patch also might fix a rollover bug.. I haven't tested this
extensively but I don't think the previous version of the rollover code
on either token bucket was correct, and I would expect it to get stuck
after the first rollover.
Signed-off-by: Micah Elizabeth Scott <beth@torproject.org>
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Signed-off-by: David Goulet <dgoulet@torproject.org>
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Move it outside of the validation function since 0 is a valid value but
disables defenses.
Signed-off-by: David Goulet <dgoulet@torproject.org>
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Move everything to its own function in order to better log, document and tests
the introduction point validation process.
Signed-off-by: David Goulet <dgoulet@torproject.org>
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Remove the public functions returning the HS DoS consensus param or default
values as it is exclusively used internally now.
Rename the param_* variables to consensus_param_* for better code semantic.
Finally, make some private functions available to unit tests.
Signed-off-by: David Goulet <dgoulet@torproject.org>
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We added a flag on the circuit to know if the DoS defenses are enabled or not.
Before, it was solely the consensus parameter.
Part of #30924
Signed-off-by: David Goulet <dgoulet@torproject.org>
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Make it clear that these functions return the consensus param only.
Introduction point can not set those values with a torrc option.
Signed-off-by: David Goulet <dgoulet@torproject.org>
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Signed-off-by: David Goulet <dgoulet@torproject.org>
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Part of #15516
Signed-off-by: David Goulet <dgoulet@torproject.org>
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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>
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