[tor-relays] Installing obfs4 on Raspberry Pi bridge

[jchase]

Hello,
When I run

 $ go get git.torproject.org/pluggable-transports/obfs4.git/obfs4proxy
 $ sudo cp $GOPATH/bin/obfs4proxy /usr/local/bin

on a laptop running linuxmint/ubuntu it produces a nice binary
executable. Unfortunately it doesn't work to copy it to the Pi2, because
it's not an ARM binary.
When I run the same script on the Pi2 I get the following error messages:

go get git.torproject.org/pluggable-transports/obfs4.git/obfs4proxy
# git.torproject.org/pluggable-transports/obfs4.git/common/ntor
/usr/lib/go/src/pkg/git.torproject.org/pluggable-transports/obfs4.git/common/ntor/ntor.go:272:
undefined: sha256.Sum256
/usr/lib/go/src/pkg/git.torproject.org/pluggable-transports/obfs4.git/common/ntor/ntor.go:369:
undefined: hmac.Equal
# git.torproject.org/pluggable-transports/obfs4.git/common/log
/usr/lib/go/src/pkg/git.torproject.org/pluggable-transports/obfs4.git/common/log/log.go:131:
function ends without a return statement
# git.torproject.org/pluggable-transports/obfs4.git/transports/obfs3
/usr/lib/go/src/pkg/git.torproject.org/pluggable-transports/obfs4.git/transports/obfs3/obfs3.go:278:
function ends without a return statement
# git.torproject.org/pluggable-transports/obfs4.git/transports/scramblesuit
/usr/lib/go/src/pkg/git.torproject.org/pluggable-transports/obfs4.git/transports/scramblesuit/conn.go:322:
undefined: hmac.Equal
/usr/lib/go/src/pkg/git.torproject.org/pluggable-transports/obfs4.git/transports/scramblesuit/handshake_uniformdh.go:143:
undefined: hmac.Equal
/usr/lib/go/src/pkg/git.torproject.org/pluggable-transports/obfs4.git/transports/scramblesuit/handshake_uniformdh.go:152:
undefined: sha256.Sum256

and the script exits

Any idea how I can get it cleanly on a Pi2?
Thanks,
J. Chase

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> Today's Topics:
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>    1. Re: Installing obfs4 on Raspberry Pi bridge (jchase)
>    2. Re: Installing obfs4 on Raspberry Pi bridge (Yawning Angel)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sun, 12 Apr 2015 17:43:55 +0000
> From: jchase <jchase at riseup.net>
> To: tor-relays at lists.torproject.org
> Subject: Re: [tor-relays] Installing obfs4 on Raspberry Pi bridge
> Message-ID: <552AAEDB.4020007 at riseup.net>
> Content-Type: text/plain; charset=windows-1252
> 
> Hello,
> Thanks to you I have tor 0.2.5.11 running on a Raspberry Pi2 and obfs4
> installed from git. I have good news and bad news.
> The largest problem is that I get the warning "could not launch managed
> proxy executable at '/path/obfs4proxy'('Permission denied')" In the past
> this used to be a problem with apparmor, but apparmor isn't installed.
> Any idea where I can start looking for a solution?
> Here are a couple of details and small problems:
> I didn't install obfs4 directly (due to problems), but installed it to
> another laptop and copied it to the Pi2 using scp.
> I have ORPort somewhere above 9000. When I set it to auto, I got a late
> warning that the port chosen by tor was presenting problems, had I
> arranged port forwarding, etc.? ExtORPort is "auto" and I get no
> complaints (probably because obfs4 isn't working).
> And I have ServerTransportListenAddr obfs3 0.0.0.0:90xx because a lower
> port, like 80, with port forwarding, received a warning (and didn't work).
> One thing at a time... Like I asked, where can I look for answers to the
> obfs4proxy permission denied problem? If I get that fixed, I assume I
> can play around with the rest until I can use lower ports.
> Thanks,
> J Chase
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Sun, 12 Apr 2015 20:14:33 +0000
> From: Yawning Angel <yawning at schwanenlied.me>
> To: tor-relays at lists.torproject.org
> Subject: Re: [tor-relays] Installing obfs4 on Raspberry Pi bridge
> Message-ID: <20150412201433.6c42f28d at schwanenlied.me>
> Content-Type: text/plain; charset="us-ascii"
> 
> On Sun, 12 Apr 2015 17:43:55 +0000
> jchase <jchase at riseup.net> wrote:
>> Hello,
>> Thanks to you I have tor 0.2.5.11 running on a Raspberry Pi2 and obfs4
>> installed from git. I have good news and bad news.
>> The largest problem is that I get the warning "could not launch
>> managed proxy executable at '/path/obfs4proxy'('Permission denied')"
>> In the past this used to be a problem with apparmor, but apparmor
>> isn't installed. Any idea where I can start looking for a solution?
>> Here are a couple of details and small problems:
>> I didn't install obfs4 directly (due to problems), but installed it to
>> another laptop and copied it to the Pi2 using scp.
> 
> Oh dear.  What happens when you run the obfs4proxy executable in a
> shell directly (on the pi2)?
> 
> It should look something like:
>  $ ./obfs4proxy
>  2015/04/12 20:13:02 [ERROR]: obfs4proxy - must be run as a managed
>  transport
> 
> If not, what does 'file /path/obfs4proxy' say?
> 
> Regards,
>