[tor-dev] Obfsproxy client for Android

[Nathan Freitas]

On 02/10/2012 08:11 AM, Roger Dingledine wrote:
> On Fri, Feb 10, 2012 at 07:56:04AM -0500, Nathan Freitas wrote:
>> > Thoughts on attempting to port and ship Obfsproxy client functionality
>> > to Android?
>> > Where should we begin? Any details on exactly what was done for the new TBB?
> Step one, build obfsproxy for Android. I expect your biggest problem
> will be libevent2 since you won't have any packages for it. See

Happy to say that libevent2 and obfsproxy have been successfully
cross-compiled for Android w/o major patching, and all seems to be
working well with a manually hacked version of Orbot. I have to get some
sleep now, but should have a new Orbot proper build in 24 hours (with
the help of Gsathya and Kensen from GP).

I've posted some test binaries with an Android shell-based how to here:
https://github.com/downloads/guardianproject/Orbot/obfsproxy-20120212a.tar.gz
(.asc)

***
This currently requires root, and Orbot should be deactivated.

1) adb push the files about to /data/local

2) adb shell; su

3) mv the files above from /data/local to
/data/data/org.torproject.android/app_bin

4) chown the new files to the uid of the orbot app (e.g. "chmod
app_2.app_2 tor").
find the uid by 'ls'-ing in the
/data/data/org.torproject.android/app_bin folder

5) chmod 700 obfsproxy; chmod 700 tor;

6) export HOME=/data/data/org.torproject.android/app_bin

7) /data/data/org.torproject.android/app_bin/tor DataDirectory
/data/data/org.torproject.android/cache -f
/data/data/org.torproject.android/app_bin/torrc

8) Open Firefox Mobile with ProxyMob add-on, and you should be ready to
roll.


***

Feb 11 03:29:23.275 [notice] Tor v0.2.3.11-alpha (git-9ce9836f853d8a31)
running on Linux armv7l.
Feb 11 03:29:23.276 [notice] Tor can't help you if you use it wrong!
Learn how to be safe at https://www.torproject.org/download/download#warning
...
Feb 11 03:29:31.000 [notice] Bootstrapped 80%: Connecting to the Tor
network.
Feb 11 03:29:31.000 [notice] Bootstrapped 90%: Establishing a Tor circuit.
Feb 11 03:29:32.000 [notice] new bridge descriptor 'maximatorbridge'
(fresh): $55329E0FB775496D4479AC1E0D2CDE3B98D774C3~maximatorbridge at
212.112.242.160
Feb 11 03:29:32.000 [notice] new bridge descriptor 'ghobfsbridge1'
(fresh): $10D5B1C21544B64EBC2A4275FE32A8D4A40405B5~ghobfsbridge1 at
213.108.105.129
Feb 11 03:29:32.000 [notice] new bridge descriptor 'torbridge42'
(fresh): $9459581B2DA5458D19790C28918CB544B3854C8A~torbridge42 at
85.214.131.213
Feb 11 03:29:32.000 [notice] new bridge descriptor 'Unnamed' (fresh):
$7C7DC083FFCFE383268B873D2CB046684B615648~Unnamed at 85.17.20.242
Feb 11 03:29:32.000 [notice] new bridge descriptor 'Unnamed' (fresh):
$478208B87337CAC2E9391AD7B91D125193D5A641~Unnamed at 91.208.34.7
Feb 11 03:29:32.000 [notice] new bridge descriptor 'Unnamed' (fresh):
$5F88FDA345422B32E1A20F2761182C23CD49EA79~Unnamed at 131.215.158.1
Feb 11 03:29:32.000 [notice] new bridge descriptor 'ndnop0' (fresh):
$9D7259A696F7DAB073043B28114112A46D36CFFD~ndnop0 at 109.105.109.163
Feb 11 03:29:32.000 [notice] new bridge descriptor 'Unnamed' (fresh):
$00BC5E7111BD00E9AF463BE9BFE6255FE51CFCD9~Unnamed at 109.163.233.195
Feb 11 03:29:33.000 [notice] Tor has successfully opened a circuit.
Looks like client functionality is working.
Feb 11 03:29:33.000 [notice] Bootstrapped 100%: Done.


***

+n8fr8