These errors can occur if we are built on a system with support for
madvise(MADV_NOFORK) but then we are run on a system whose kernel
does not support that flag.
If the error is something that we don't tolerate at all, we now log
it before crashing.
Fixes bug 31570. I am calling this a bugfix on 0.4.1.1-alpha, where
we actually started using the map_anon code.
Some platforms (macOS, maybe others?) can swallow the last write before an
abort. This issue is probably caused by a race condition between write
buffer cache flushing, and process termination. So we write an extra
newline, to make sure that the message always gets through.
Fixes bug 31571; bugfix on 0.3.5.1-alpha.
We want to report the tor version, even on platforms that don't have
backtrace support (like Android).
This commit stores the backtrace Tor version, regardless of USE_BACKTRACE.
Preparation for 31571.
This fixes LTO compilation for Android and -O0 compilation in
general, when --disable-module-dirauth is provided.
Fixes bug 31552; bugfix on 0.4.1.1-alpha.
Rewrite format_node_description() and router_get_verbose_nickname() to
use strlcpy() and strlcat(). The previous implementation used memcpy()
and pointer arithmetic, which was error-prone.
Closes ticket 31545. This is CID 1452819.
These functions are all used to implement the ROUTERSET_type_defn
object, which maps strings to and from routerset_t configuration
variables for the configuration module.
routerset_t has two representations of an empty routerset: NULL, and
a set containing no elements. But some of our config code assumes
that empty routersets are represented as NULL. So let's give it
what it assumes.
Fixes bug 31495. Bugfix on e16b90b88a76; but not in any released
Tor.
A configuration manager, in addition to a top-level format object,
may now also know about a suite of sub-formats. Top-level
configuration objects, in turn, may now have a suite of
sub-objects.
The right way to free a config object is now to wrap config_free(),
always. Instead of creating an alternative free function, objects
should provide an alternative clear callback to free any fields that
the configuration manager doesn't manage.
This lets us simplify our code a little, and lets us extend the
confparse.c code to manage additional fields in config_free.
Every time we finalize a config manager, we now generate a new magic
number for it, so that we'll get an assertion failure if we ever try
to use an object with a different configuration manager than the one
that generated it.
It's good style to always add parentheses when using macro
arguments, in case somebody someday provides an argument that
contains an operator you don't expect, or causes the expression to
parse differently.
In Tor's tests, the tt_*() macros can call "goto done" on failure.
When that happens, we need to make sure that all of our allocated
memory still gets freed, or else Coverity will complain.
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>
When consensus changes, we also need to update the circuit INTRO2 defenses
enabled flag and not only the token bucket.
Signed-off-by: David Goulet <dgoulet@torproject.org>
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>
This commit makes it that the hs_dos.c file only uses the consensus parameter
variables set when we initialize and when the consensus changes.
There is no need to call each time networkstatus_get_param(), which is
expensive, when we want access to a consensus value.
Signed-off-by: David Goulet <dgoulet@torproject.org>
A bit cleaner especially that the next commit(s) will make the consensus param
interface private to hs_dos.c so we expose as little as we can outside of the
subsystem.
Part of #30924
Signed-off-by: David Goulet <dgoulet@torproject.org>
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>
This commit makes tor add the DoS cell extension to the ESTABLISH_INTRO cell
if the defense is enabled on the service side with a torrc option.
Furthermore, the cell extension is only added if the introduction point
supports it. The protover version HSIntro=5 is looked for.
Signed-off-by: David Goulet <dgoulet@torproject.org>
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>
Previously, v3 single onion services failed when all intro nodes were
unreachable via a 1-hop path. Now, we select intros that are only available
via a 3-hop path, and use a 3-hop path to connect to them.
Fixes bug 23507; bugfix on 0.3.2.1-alpha.
Previously, we used a 1-hop path when a single onion rend failed
immediately, and a 3-hop path when it failed after trying to build
a circuit.
Fixes bug 23818; bugfix on 0.3.2.1-alpha.
Previously, we used a 1-hop path when a single onion rend failed
immediately, and a 3-hop path when it failed after trying to build
a circuit.
Fixes bug 23818; bugfix on 0.2.9.3-alpha.
Coverity wants us to free everything that we are potentially
allocating, even stuff where allocating it would be a bug. Adding
a smartlist_free() here will fix the warning.
Fixes bug 31452; bugfix on 16a0b7ed67, which is not in
any released Tor. This is CID 1447292.
If unsigned int is 32-bits long, then our old code would give a
wrong result with any log domain whose mask was >= (1<<32).
Fortunately, there are no such log domains right now: the domain
mask is only 64 bits long to accommodate some flags.
Found by coverity as CID 1452041.
Fixes bug 31451; bugfix on 0.4.1.4-rc.
New IP address from 194.109.206.212 to 45.66.33.45.
Signed request from Alex de Joode, operator of dizum:
https://trac.torproject.org/projects/tor/ticket/31406
Published descriptor by dizum on August 12th, 2019:
--
r dizum fqbq1v2DCDxTj0QDi7+gd1h911U GZmZtCLaPDQNxkhIFj8UcgTRAuA 2019-08-12 15:28:40 45.66.33.45 443 80
s Authority Fast Running Stable V2Dir Valid
v Tor 0.4.0.5
pr Cons=1-2 Desc=1-2 DirCache=1-2 HSDir=1-2 HSIntro=3-4 HSRend=1-2 Link=1-5 LinkAuth=1,3 Microdesc=1-2 Relay=1-2 Padding=1
w Bandwidth=20 Unmeasured=1
p reject 1-65535
--
Finally, confirmed by DNS:
$ dig +short tor.dizum.com
45.66.33.45
Closes#31406
Signed-off-by: David Goulet <dgoulet@torproject.org>
By binding the protover numbering to specific padding machines, we can make
our padding negotiation simpler. We probably should have done this in the
first place.
This has the side effect that earlier 0.4.1.x-alpha clients won't negotiate
with 0.4.1.x-stable relays, and 0.4.1.x-stable clients won't negotiate with
earlier 0.4.1.x-alpha relays (or 0.4.0.x relays). Since we don't support
alphas after the stable is released, this is fine, so long as it gets in
before the first stable of 0.4.1.x.
Previously we tried multiplying by -1 before casting to int32_t,
which would cause us to cast the -1 to an unsigned before we
multiplied. This gave us compiler warnings on windows.
Fixes bug 31353; bug not in any released Tor.
On some windows builds, time_t is 64 bits but long is not. This is
causing appveyor builds to fail.
Also, one of our uses of labs() on time_t was logically incorrect:
it was telling us to accept NETINFO cells up to three minutes
_before_ the message they were responding to, which doesn't make
sense.
This patch adds a time_abs() function that we should eventually move
to intmath.h or something. For now, though, it will make merges
easier to have it file-local in channeltls.c.
Fixes bug 31343; bugfix on 0.2.4.4-alpha.
In case the consensus parameters for the rate/burst changes, we need to update
all already established introduction circuits to the newest value.
This commit introduces a "get all intro circ" function from the HS circuitmap
(v2 and v3) so it can be used by the HS DoS module to go over all circuits and
adjust the INTRODUCE2 token bucket parameters.
Signed-off-by: David Goulet <dgoulet@torproject.org>
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>
A .may_includes file can be "advisory", which means that some
violations of the rules are expected. We will track these
violations with practracker, not as automatic errors.
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.
