[tor-bugs] #24203 [Core Tor/Tor]: Snowflake can't be configured to run with system tor: ENV-ERROR no TOR_PT_STATE_LOCATION environment variable

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#24203: Snowflake can't be configured to run with system tor: ENV-ERROR no
TOR_PT_STATE_LOCATION environment variable
--------------------------+-----------------------------------
 Reporter:  cypherpunks   |          Owner:  (none)
     Type:  defect        |         Status:  needs_information
 Priority:  Medium        |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor  |        Version:
 Severity:  Major         |     Resolution:
 Keywords:  snowflake     |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
--------------------------+-----------------------------------
Changes (by dcf):

 * status:  new => needs_information


Comment:

 cypherpunks, what version of Tor Browser did you copy snowflake-client
 from? And does Snowflake work inside Tor Browser (not with system tor)? I
 ask because I tried with [https://archive.torproject.org/tor-package-
 archive/torbrowser/7.5a4/tor-browser-linux64-7.5a4_en-US.tar.xz tor-
 browser-linux64-7.5a4_en-US.tar.xz] and I didn't get the ENV-ERROR from
 comment:3; rather I got the libatomic error from #24465/#25087:
 {{{
 # /usr/bin/snowflake-client -h
 /usr/bin/snowflake-client: error while loading shared libraries:
 libatomic.so.1: cannot open shared object file: No such file or directory
 }}}

 This is what I did:
  * `wget http://archive.ubuntu.com/ubuntu/dists/artful/main/installer-
 amd64/current/images/netboot/mini.iso`
  * `qemu-img create -f qcow2 ubuntu.hda 5G`
  * `kvm -cpu host -hda ubuntu.hda -cdrom mini.iso -k en-us -m 2G` and
 install, halt
  * `kvm -cpu host -hda ubuntu.hda -k en-us -m 2G`
 Inside the VM:
  * `sudo apt-get install tor`
  * `wget https://archive.torproject.org/tor-package-
 archive/torbrowser/7.5a4/tor-browser-linux64-7.5a4_en-US.tar.xz`
  * `tar xf tor-browser-linux64-7.5a4_en-US.tar.xz`
  * `sudo cp tor-browser_en-US/Browser/TorBrowser/Tor/PluggableTransports
 /snowflake-client /usr/bin`
  * `sudo chmod +rx /usr/bin/snowflake-client`
  * Edit /etc/tor/torrc:
    {{{
 UseBridges 1
 ClientTransportPlugin snowflake exec /usr/bin/snowflake-client
 Bridge snowflake 0.0.3.0:1
    }}}
  * `sudo service tor restart` (Note I hadn't changed apparmor settings
 yet.)
    /var/log/syslog shows
    {{{
 Cloud not launch managed proxy executable at '/usr/bin/snowflake-client'
 ('Permission denied').
    }}}
  * Add to /etc/apparmor.d/abstractions/tor:
    {{{
   /usr/bin/snowflake-client ix,
    }}}
  * `sudo service apparmor restart`
  * `sudo service tor restart` Now I get the expected error:
    {{{
 The communication stream of managed proxy '/usr/bin/snowflake-client' is
 'closed'. Most probably the managed proxy stopped running. This might be a
 bug of the managed proxy, a bug of Tor, or a misconfiguration. Please
 enable logging on your managed proxy and check the logs for errors.
    }}}
  * `/usr/bin/snowflake-client -h`
    {{{
 /usr/bin/snowflake-client: error while loading shared libraries:
 libatomic.so.1: cannot open shared object file: No such file or directory
    }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24203#comment:8>
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