The length of auth_data from an INTRODUCE2 cell is checked when the
auth_type is recognized (1 or 2), but not for any other non-zero
auth_type. Later, auth_data is assumed to have at least
REND_DESC_COOKIE_LEN bytes, leading to a client-triggered out of bounds
read.
Fixed by checking auth_len before comparing the descriptor cookie
against known clients.
Fixes#15823; bugfix on 0.2.1.6-alpha.
Bug 21242 occurred because we asserted that extend_info_from_node()
had succeeded...even though we already had the code to handle such a
failure. We fixed that in 93b39c5162.
But there were four other cases in our code where we called
extend_info_from_node() and either tor_assert()ed that it returned
non-NULL, or [in one case] silently assumed that it returned
non-NULL. That's not such a great idea. This patch makes those
cases check for a bug of this kind instead.
Fixes bug 21372; bugfix on 0.2.3.1-alpha when
extend_info_from_node() was introduced.
Once a second, we go over all services and consider the validity of the intro
points. Now, also try to remove expiring nodes that have no more circuit
associated to them. This is possible if we moved an intro point object
previously to that list and the circuit actually timed out or was closed by
the introduction point itself.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Previously the dirserv_orconn_tls_done() function would skip routers
when they advertised an ed25519 key but didn't present it during the
link handshake. But that covers all versions between 0.2.7.2-alpha
and 0.2.9.x inclusive!
Fixes bug 21107; bugfix on 0.3.0.1-alpha.
Because we don't allow client functionalities in non anonymous mode,
recommending Tor2web is a bad idea.
If a user wants to use Tor2web as a client (losing all anonymity), it should
run a second tor, not use it with a single onion service tor.
Fixes#21294.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Determining if OpenSSL structures are opaque now uses an autoconf check
instead of comparing the version number. Some definitions have been
moved to their own check as assumptions which were true for OpenSSL
with opaque structures did not hold for LibreSSL. Closes ticket 21359.
It is renamed to --enable-fragile-hardening.
TROVE-2017-001 was triggerable only through the expensive hardening which is
making the tor daemon abort when the issue is detected. Thus, it makes tor
more at risk of remote crashes but safer against RCE or heartbleed bug
category.
Fixes#21290.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Stop modifying the value of our torrc option HiddenServiceStatistics just
because we're not a bridge or relay. This bug was causing Tor Browser users to
write "HiddenServiceStatistics 0" in their torrc files as if they had chosen
to change the config.
Fixes#21150
Signed-off-by: David Goulet <dgoulet@torproject.org>
Since we can call this function more than once before we update all
the confirmed_idx fields, we can't rely on all the relays having an
accurate confirmed_idx.
Fixes bug 21129; bugfix on 0.3.0.1-alpha
We need to call it before nt_service_parse_options(), since
nt_service_parse_options() can call back into nt_service_main(),
which calls do_main_loop().
Fixes bug 21356; bugfix on 0.2.9.1-alpha.
I broke "GETCONF *Port" in 20956, when I made SocksPort a
subordinate option of the virtual option SocksPortLines, so that I
could make SocksPort and __SocksPort provide qthe same
functionality. The problem was that you can't pass a subordinate
option to GETCONF.
So, this patch fixes that by letting you fetch subordinate options.
It won't always be meaningful to consider these options
out-of-context, but that can be the controller-user's
responsibility to check.
Closes ticket 21300.
If there are no ephemeral or detached onion services, then
"GETINFO onions/current" or "GETINFO onions/detached" should
return an empty list instead of an error
If tor_mmap_file is called with a file which is larger than SIZE_MAX,
only a small part of the file will be memory-mapped due to integer
truncation.
This can only realistically happen on 32 bit architectures with large
file support.
When marking for close a circuit, the reason value, a integer, was assigned to
a uint16_t converting any negative reasons (internal) to the wrong value. On
the HS side, this was causing the client to flag introduction points to be
unreachable as the internal reason was wrongfully converted to a positive
16bit value leading to flag 2 out of 3 intro points to be unreachable.
Fixes#20307 and partially fixes#21056
Signed-off-by: David Goulet <dgoulet@torproject.org>
That way, when we are parsing the options and LearnCircuitBuildTimeout is set
to 0, we don't assert trying to get the options list with get_options().
Fixes#21062
Signed-off-by: David Goulet <dgoulet@torproject.org>
The server-side clipping now clamps to one of two values, both
for what to report, and how long to cache.
Additionally, we move some defines to dns.h, and give them better
names.
In addition to the comments in the ticket, couple hidden service options have
been improved to clarify the maximum and minimum values they can be set to.
Closes#21058
Signed-off-by: David Goulet <dgoulet@torproject.org>
An operator couldn't set the number of introduction point below the default
value which is 3. With this commit, from 0 to the hardcoded maximum is now
allowed.
Closes#21033
Signed-off-by: David Goulet <dgoulet@torproject.org>
Our config code is checking correctly at DataDirectoryGroupReadable but then
when we initialize the keys, we ignored that option ending up at setting back
the DataDirectory to 0700 instead of 0750. Patch by "redfish".
Fixes#19953
Signed-off-by: David Goulet <dgoulet@torproject.org>
In the past, when we exhausted all guards in our sampled set, we just
waited there till we mark a guard for retry again (usually takes 10 mins
for a primary guard, 1 hour for a non-primary guard). This patch marks
all guards as maybe-reachable when we exhaust all guards (this can
happen when network is down for some time).
In 8a0ea3ee43 we added a
temp_service_list local variable to rend_config_services, but we
didn't add a corresponding "free" for it to all of the exit paths.
Fixes bug 20987; bugfix on 0.3.0.1-alpha.
Some DNS NXDOMAIN hijackers hijack truly ridiculous domains, like
"invalid-stuff!!" or "1.2.3.4.5". This would provoke unit test
failures where we used addresses like that to force
tor_addr_lookup() to fail. The fix, for testing, is to mock
tor_addr_lookup() with a variant that always fails when it gets
a name with a !.
Fixes bugs 20862 and 20863.
These relays need to be contacted over their ORPorts using a begindir
connection, and relays try not to use begindir connections.
Fixes bug 20711; bugfix on 0.2.8.2-alpha.
Because <unset> makes more sense than AAAAAAAAAAAAAAAAAAA...
(I have indeed verified that ed25519_fmt() is only used for
logging. This patch also clarifies the intention that ed25519_fmt()
is only for logging.
Closes ticket 21037.
Previously we were marking directory guards up in
..._process_inbuf(), but that's wrong: we call that function on
close as well as on success. Instead, we're marking the dirguard up
only after we parse the HTTP headers. Closes 20974.
The abort handler masks the exit status of the backtrace generator by
capturing the abort signal from the backtrace handler and exiting with
zero. Because the output of the backtrace generator is meant to be piped
to `bt_test.py`, its exit status is unimportant and is currently
ignored.
The abort handler calls `exit(3)` which is not asynchronous-signal-safe
and calling it in this context is undefined behavior [0].
Closes ticket 21026.
[0] https://www.securecoding.cert.org/confluence/x/34At
When marking for close a circuit, the reason value, a integer, was assigned to
a uint16_t converting any negative reasons (internal) to the wrong value. On
the HS side, this was causing the client to flag introduction points to be
unreachable as the internal reason was wrongfully converted to a positive
16bit value leading to flag 2 out of 3 intro points to be unreachable.
Fixes#20307 and partially fixes#21056
Signed-off-by: David Goulet <dgoulet@torproject.org>
First, this commit moves the code used to prune the service list when
reloading Tor (HUP signal for instance) to a function from
rend_config_services().
Second, fix bug #21054, improve the code by using the newly added
circuit_get_next_service_intro_circ() function instead of poking at the global
list directly and add _many_ more comments.
Fixes#21054.
Signed-off-by: David Goulet <dgoulet@torproject.org>
This helps protect against bugs where any part of a buf_t's memory
is passed to a function that expects a NUL-terminated input.
It also closes TROVE-2016-10-001 (aka bug 20384).
Replace the 81 remaining fallbacks of the 100 originally introduced
in Tor 0.2.8.3-alpha in March 2016, with a list of 177 fallbacks
(123 new, 54 existing, 27 removed) generated in December 2016.
Resolves ticket 20170.
Sometimes, the fallback generation script doesn't add attributes to the
fallbacks in the list. If this happens, log an error, and avoid selecting
that fallback.
This is a rare issue: it should not change selection behaviour.
Fixes issue #20945.
Exclude relays that have been down for 1 or more days from the fallback
candidate list.
When a relay operator has multiple relays, this prioritises relays that are
up over relays that are down.
Fixes issue #20926.
7 days is a tradeoff between the expected time between major Tor releases,
which is 6 months, and the number of relays with enough stability.
Relays whose OnionOO stability timer is reset on restart by bug #18050
should upgrade to Tor 0.2.8.7 or later, which has a fix for this issue.
Closes ticket #20880; maintains short-term fix in e220214 in tor-0.2.8.2-alpha.
In get_token(), we could read one byte past the end of the
region. This is only a big problem in the case where the region
itself is (a) potentially hostile, and (b) not explicitly
nul-terminated.
This patch fixes the underlying bug, and also makes sure that the
one remaining case of not-NUL-terminated potentially hostile data
gets NUL-terminated.
Fix for bug 21018, TROVE-2016-12-002, and CVE-2016-1254
They broke stem, and breaking application compatibility is usually a
bad idea.
This reverts commit 6e10130e18,
commit 78a13df158, and
commit 62f52a888a.
We might re-apply this later, if all the downstream tools can handle
it, and it turns out to be useful for some reason.
Back when Roger had do do most of our testing on the moria host, we
needed a higher limit for the number of relays running on a single
IP address when that limit was shared with an authority. Nowadays,
the idea is pretty obsolete.
Also remove the router_addr_is_trusted_dir() function, which served
no other purpose.
Closes ticket 20960.
The signed_descriptor_move() was not releasing memory inside the destination
object before overwriting it with the source object. This commit adds a reset
function that free that memory inside a signed descriptor object and zero it.
Closes#20715.
Signed-off-by: David Goulet <dgoulet@torproject.org>
Tor 0.2.9 has a broader range of fixes and workarounds here, but for
0.2.8, we're just going to maintain the existing behavior.
(The alternative would be to backport both
1eba088054 and
16fcbd21c9 , but the latter is kind of
a subtle kludge in the configure.ac script, and I'm not a fan of
backporting that kind of thing.)
(OpenSSL 1.1 makes EVP_CIPHER_CTX opaque, _and_ adds acceleration
for counter mode on more architectures. So it won't work if we try
the older approach, and it might help if we try the newer one.)
Fixes bug 20588.
This resolves two issues:
* the checks in rend_add_services were only being performed when adding
the service, and not when the service was validated,
(this meant that duplicate checks were not being performed, and some SETCONF
commands appeared to succeed when they actually failed), and
* if one service failed while services were being added, then the service
list would be left in an inconsistent state (tor dies when this happens,
but the code is cleaner now).
Fixes#20860.
When computing old Tor protocol line version in protover, we were looking at
0.2.7.5 twice instead of the specific case for 0.2.9.1-alpha.
Fixes#20810
Signed-off-by: David Goulet <dgoulet@torproject.org>
newconn->address is strdup'ed twice when new_type == CONN_TYPE_AP
and conn->socket_family == AF_UNIX. Whilst here, juggle code to
make sure newconn->port is assigned from an initialised value in
the above case.
Instead, refuse to start tor until the misconfigurations have been corrected.
Fixes bug 20559; bugfix on multiple commits in 0.2.7.1-alpha and earlier.
Instead, refuse to start tor if any hidden service key has been used in
a different hidden service anonymity mode.
Fixes bug 20638; bugfix on 17178 in 0.2.9.3-alpha; reported by ahf.
The original single onion service poisoning code checked poisoning state
in options_validate, and poisoned in options_act. This was problematic,
because the global array of hidden services had not been populated in
options_validate (and there were ordrering issues with hidden service
directory creation).
This patch fixes this issue in rend_service_check_dir_and_add, which:
* creates the directory, or checks permissions on an existing directory, then
* checks the poisoning state of the directory, then
* poisons the directory.
When validating, only the permissions checks and the poisoning state checks
are perfomed (the directory is not modified).
This affects clients with FetchUselessDescriptors 1.
It might also cause subtle bugs on directory mirrors and authorities,
causing them to consider all full descriptors as failed or old.
Apple is supposed to decorate their function declarations with
macros to indicate which OSX version introduced them, so that you
can tell the compiler that you want to build against certain
versions of OSX. But they forgot to do that for clock_gettime() and
getentropy(), both of which they introduced in 10.12.
This patch adds a kludge to the configure.ac script where, if we
detect that we are targeting OSX 10.11 or earlier, we don't even probe
to see if the two offending functions are present.
Closes ticket 20235.
For relays that don't know their own address, avoid attempting
a local hostname resolve for each descriptor we download. Also cut
down on the number of "Success: chose address 'x.x.x.x'" log lines.
Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
Single onion services and Tor2web deliberately create long-term one-hop
circuits to their intro and rend points, respectively.
These log messages are intended to diagnose issue 8387, which relates to
circuits hanging around forever for no reason.
Fixes bug 20613; bugfix on 0.2.9.1-alpha. Reported by "pastly".
It's not okay to use the same varargs list twice, and apparently
some windows build environments produce code here that would leave
tor_asprintf() broken. Fix for bug 20560; bugfix on 0.2.2.11-alpha
when tor_asprintf() was introduced.
