[tor-bugs] #7153 [Pluggable transport]: Don't require pluggable transport proxies to be SOCKS proxies

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#7153: Don't require pluggable transport proxies to be SOCKS proxies
---------------------------------+------------------------------------------
 Reporter:  karsten              |          Owner:  asn
     Type:  project              |         Status:  new
 Priority:  normal               |      Milestone:     
Component:  Pluggable transport  |        Version:     
 Keywords:  SponsorZ             |         Parent:     
   Points:                       |   Actualpoints:     
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 (Re-using text from Zack Weinberg for this description.)

 There are pluggable transport proxies that don't actually act as a SOCKS
 proxy.  For example, StegoTorus has its own configuration; it ignores
 everything told it in the SOCKS dialogue and always connects to the bridge
 that it knows about.  If you want multiple StegoTorus bridges accessible
 to your Tor client, you need multiple `"ClientTransportPlugin ... exec"`
 specifications.  This is only going to get worse when they move away from
 having everything set up on StegoTorus' command line, which has been
 direly needed for some time now.

 Theoretically all of StegoTorus' configuration ''could'' be encapsulated
 in the SOCKS key-value-pairs-in-the-password hack that's described in 180
 -pluggable-transport.txt, but they never implemented that and they don't
 want to.  They want to rip out all of the SOCKS code, in fact.  The way
 they want it to work is

 {{{
 Bridge storus1 direct [keyid=...]
 ClientTransportPlugin storus1 direct 127.0.0.1:8888
 }}}

 In this case, `'storus1'` is *not* a "method", it's a human-readable
 identifier for the bridge that Tor will be connected to if it starts
 talking the OR protocol -- with no initial SOCKS exchange! -- on
 127.0.0.1:8888.

 `"direct"` should also be valid in CMETHOD/SMETHOD lines for the proxy-
 management protocol, with the same semantics.  Zack says he hasn't really
 thought through how the server side of this stuff ought to work.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7153>
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