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OnionV3

emdee 2022-10-14 11:54:18 +00:00
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86
ToxAndTorInChinaAndIran.md

@ -3,44 +3,62 @@ Up: [[Home]]
From: https://github.com/TokTok/c-toxcore/issues/419
I don't think indistinguishable message bytes and sizes are going to
make any difference when they are sent over a network of so few
bootstrap nodes. And anyone operating in a hostile environment is
probably already running Tox over Tor, which works well.
make any difference when they are sent over a network of so few bootstrap nodes.
And anyone operating in a hostile environment is probably already
running Tox over Tor, which works well.
Did the reports of blocking in China include blocking over Tor? Tor itself has implemented pluggable transport mechanisms that are continuously being improved, and these include ways to make the traffic look like another protocol like HTTP or whatever: <https://snowflake.torproject.org/>
Did the reports of blocking in China include blocking over Tor? Tor
itself has implemented pluggable transport mechanisms that are
continuously being improved, and these include ways to make the
traffic look like another protocol like HTTP or whatever:
<https://snowflake.torproject.org/>
So the best way to handle this may be to improve the documentation in Tox of how to use Tor, and how to configure Tor to use pluggable transports. They are the only things that work in e.g. Egypt or Iran.
So the best way to handle this may be to improve the documentation in
Tox of how to use Tor, and how to configure Tor to use pluggable transports (obfs4).
Whether or not you trust Tor (you can't trust Exit nodes 40% of the time)
they are the only things that work right now in e.g. Egypt or Iran.
I also think the other way of getting a lot of resilience "cheaply" is
to encourage bootstrap node operators to also run a Tor node to serve
the BS over Onionv3. This is the only way I can see dealing with the
fact that Tox is a network of so few bootstrap nodes. If the Tox
codebase was improved to work with Onionv3 BS nodes, and OnionV3
relays, it would be much more resilient.
I also think the only way of getting a lot of resilience "cheaply" is
to encourage bootstrap node operators to also run a Tor client to serve
the BS node over Onionv3. This is the only way I can see dealing with the
fact that Tox is a network of so few bootstrap nodes. If the Tox nodebase was
improved to serve BS nodes, and OnionV3 relays, it would be much more resilient.
I'm assuming the adversaries cannot block .onion addresses within Tor.
There is a way of configuring Tor to uniquely assign a
There is a way of configuring a Tor client to uniquely assign a
life-of-the-tor-instance IPv4 address from a predefined private range
(VirtualAddrNetwork) to each onion address it sees:
AutomapHostsOnResolve. So Tox could use OnionV3 BS nodes in a
properly configured Tor with just some properly configured BS hosts
lists (if enough BS nodes provided OnionV3 addresses), Then we could
leave the heavy lifting of the cat-and-mouse games of pluggable
transports etc. to Tor (or i2p), and not try to chase them ourselves.
(VirtualAddrNetworkIPv4) to each onion address it sees:
```AutomapHostsOnResolve 1```. So Tox could use OnionV3 BS nodes in a
properly configured Tor with just some properly configured BS hosts lists
(if enough BS nodes provided OnionV3 addresses). Then we could leave
the heavy lifting of the cat-and-mouse games of pluggable transports etc.
to Tor (or i2p), and not try to chase them ourselves.
To even try out this approach I think you need to fix the
[open-for-five-years-and-counting](https://github.com/TokTok/c-toxcore/issues/469)
issue of not resolving the IP address of the targets when you are in
front of a SOCKS5 proxy (Tor). But maybe there's another way: you
could contact each of the OnionV3 BS nodes outside of Tox and get the
IPv4 address of each Onion BS node, for-life-of-the-tor-instance
which is usually long enough, in Python using the Tor stem library.
Then you could use these IPv4 addresses as your BS nodes, as long as
your client didn't suffer from the dreaded deranged-hard-coded-bs syndrome.
If you have such a list of onion addresses, the Tor user, who is running
a Tor instance anyway to connect with the Tox client, adds this to the
```/etc/tor/torrc```
```
VirtualAddrNetworkIPv4 172.16.0.0/12
AutomapHostsOnResolve 1
```
Then with the list of onion addresses for BS nodes that are running Tox as OnionV3,
then you can use ```tor-resolve``` or ```tor-resolve -4``` to get the
good-for-you-only IP addresses of OnionV3 BS nodes in IPv4. So the Tox user
does this and puts these addresses into his ```DHTnodes.json``` and boostraps his
Tox client over Tor Onions. This works with libtoxcore is it is today, as long as
your client doesn't suffer from the dreaded deranged-hard-coded-bs syndrome.
I've tried this but it's currently impossible to test as there is no
equivalent to the ```other/fun/bootstrap_node_info.py``` script for
TCP connections. For UDP you can send a packet of len 78 with the
magic first bytes and get a version and MOTD reply. Not so for TCP (
These steps would be automated by a simple bash or Python script,
perhaps a Python script wrapped into an exe for Windows. These addresses are
good for life of the Tor instance, and the script would need rerunning when Tor
is restarted. You can also get the IPv4 address of each Onion BS node,
(for-life-of-the-tor-instance which is usually long enough)
in Python using the Tor stem library.
I've tried this but it's currently impossible to test as there is no equivalent
to the ```other/fun/bootstrap_node_info.py``` script for TCP connections.
For UDP you can send a packet of len 78 with the magic first bytes and get a
version and MOTD reply. Not so for TCP (
in fact if you do send such a packet to the TCP it send the BS node into an
[infinite loop for which it neverrecovers](https://github.com/TokTok/c-toxcore/issues/2332)).
So we need a simple fix to the TCP_server code to at least look for a
@ -48,12 +66,12 @@ special packet like this and be nice and send a simple nice reply like
the UDP case. Raised as https://github.com/TokTok/c-toxcore/issues/2331
We should not kid ourselves that we don't all live in China or Iran -
the planet is in a loc$down and I think we might quickly find out just
how much resiliance we need. s/China/Iran/Syria/Russia/
the planet is in a loc$down, and I think we might quickly find out just
how much resiliance we need. s/China/Iran/Syria/Russia/GDR
* https://www.themoscowtimes.com/2021/12/07/why-the-kremlin-blocking-tor-is-a-big-deal-a75751
* https://www.wired.com/story/russia-block-tor-censorship/
* https://www.eff.org/deeplinks/2011/05/syrian-man-middle-against-facebook
* https://www.lifesitenews.com/news/biden-executive-order-allows-spying-on-americans-to-assess-political-instability-climate-threats/
Up: [[DDosSmallNumberOfBSNodes]]

7
ToxComparedWithOtherIm.md

@ -59,3 +59,10 @@ WhatsApp which relay on centralized servers.
### WhatsApp
* https://www.sott.net/article/472864-Telegram-CEO-issues-warning-about-WhatsApp-security
## Signal
[Signal](https://dt.gl/the-2021-review-of-messaging-service-providers-movim/)
not only uses Amazon Web Services servers but also Microsoft and Google servers,
and now to make things even more toxic they are also using
[Cloudflare](https://dt.gl/cloudflare-why-the-fuss/) which makes in unusable with Tor.