[Remops] Status of the Mixmaster project

[Lance Cottrell]

You are talking specifically about Remix situations, rather than standard Mixmaster behavior?

--
Lance Cottrell
loki at obscura.com



On Jul 10, 2012, at 2:20 PM, Mike Mestnik wrote:

> I know this is a few years late, but setting up Mixmaster I encountered
> a few problems in the software and protocol.
> 
> Simply put mixmaster may not handle mixed messages being passed into the
> mixmaster client side appropriately.  What should happen in that case is
> to decrement the TTL and forward the message to the node the msg is
> current encrypted for.  What happens, I guess, is that the message is
> being re-mixed.  In the event of a mail loop that means a message could
> be mixed to pass through many hundreds of nodes.  It accured to me that
> Mixmaster emails should have a TTL, I think it would be safe to generate
> TTLs like so:
> 
> A for semi random value X from 12 to ~56+-10, TTL=int(156/X).  I worked
> wit hthese numbers for a while and reduced the equation down to this.
> 156 is 12*13.  The end result is once chance to produce 13, 12, 11, 10.
> Starting with 9 there is 2 chances and 7 has 3...  and so fourth.
> 
> Now it's sad that there is a 1 in 50+ chance to get a 13 and in that
> case you'll be advertising yourself as the originator.  However the ppl
> who get 12 need others to get 13 so that they can be anonymous.
> 
> However I feel it's vary important to have a TTL, regardless of the
> tradeoff of security.  Though this will require an extension onto the
> protocol and perhaps that means a new version?
> 
> How this came about.  I had nullmail installed and I ran into a
> situation where there were no-longer any viable relay servers.  Plus I'm
> converting this server to host tor hidden services and these hidden
> websites will need to send mail.  mixmaster, I believe, will be perfect
> for this.  I configured mixmaster-smtp and pointed nullmailer at that...
> Un-aware that mixmaster wouldn't deliver mail to SMTP servers, but
> instead call into sendmail(nullmailer).  This created a mail loop that I
> didn't catch until after I had reconfigured mixmaster to use a local
> instance of socat.  Here is my configuration:
> 
> /etc/nullmailer/remotes:
> localhost smtp --port=8025
> 
> /etc/mixmaster/smtp.conf: default localhost:8025
> 
> /etc/mixmaster/client.conf:
> SMTPRELAY localhost
> SMTPUSERNAME/SMTPPASSWORD
> 
> /etc/rc.local: # socat 2.0.0-b4 installed.
> ( set +e
> daemon -n gmail --stop
> daemon -n gmail -- socat -ly TCP-LISTEN:25,bind=localhost,fork,reuseaddr
> 'OPENSSL,verify=0 | SOCKS4A:smtp.gmail.com:465 | TCP:127.0.0.1:9050'
> )
> 
> torrc: socks 127.0.0.1:9050
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