[tor-bugs] #3273 [Tor Client]: Add a supported way to lock out other controllers

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#3273: Add a supported way to lock out other controllers
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 Reporter:  nickm        |          Owner:                  
     Type:  enhancement  |         Status:  new             
 Priority:  normal       |      Milestone:  Tor: unspecified
Component:  Tor Client   |        Version:                  
 Keywords:               |         Parent:                  
   Points:               |   Actualpoints:                  
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 From time to time people have wanted a way for one and only one controller
 to be allowed to authenticate to Tor at a time.

 There are a few hacky ways to do this now: you can RESETCONF ControlPort,
 or set the __HashedControlSessionPassword to something random.

 First of all, though, we should want a usecase for this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/3273>
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