Installing obfs4 on Raspberry Pi bridge
Hello, I run a bridge on a Raspberry Pi running Debian Wheezy and tor 0.2.4.26 . I have obfs3 installed and would like to upgrade to obfs4. So far this has not been possible. If I understand it correctly, my best bet is to update to tor 0.2.6.x and then install obfs4. Let me know if I'm wrong. And if I'm right, what is the easiest way to do that? Thanks, J. Chase
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi, obfs4 will not run on 0.2.4.x , you need at least 0.2.5.x or 0.2.6.x First, upgrade your Tor. You can use torproject.org repositories. If you are running wheezy: 1. Add the repository: # echo "deb http://deb.torproject.org/torproject.org wheezy main" >> /etc/apt/sources.list 2. Add the signing key: # gpg --keyserver keys.gnupg.net --recv 886DDD89; gpg --export A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89 | apt-key add – 3. Install keyring: # apt-get update && apt-get -y install deb.torproject.org-keyring Now upgrade your Tor, an apt-get -y install tor would upgrade to 0.2.5.1 1. You can install obfs4proxy from deb.torproject.org too: # echo "deb http://deb.torproject.org/torproject.org obfs4proxy main"
/etc/apt/sources.list # apt-get update && apt-get -y install obfs4proxy
Now, modify your torrc to enable the obfs4 transport. Make sure you also add ExtORPort auto in torrc so it will report some useful statistics. obfs4proxy also supports obfs3, and some users still use that, so if you can be an obfs3 and obfs4 bridge at the same time (requires just one more open port) it would be great. Sample torrc entry for enabling obfs4 and obfs3: ExtORPort auto ServerTransportPlugin obfs3,obfs4 exec /usr/bin/obfs4proxy ServerTransportListenAddr obfs3 [::]:port ServerTransportListenAddr obfs4 [::]:port To make the bridge even better, you can bind obfs3 and obfs4 to lower ports (< 1024), if you have them free, such as obfs3 on 80 and obfs4 on 443 (for example). This will help users behind really restrictive firewalls who only allow connections on few ports. You can easily do this with libcap2-bin package: # apt-get -y install libcap2-bin # setcap 'cap_net_bind_service=+ep' /usr/bin/obfs4proxy To make this persistent after a reboot, edit the /etc/rc.local file and add this line before 'exit 0': setcap 'cap_net_bind_service=+ep' /usr/bin/obfs4proxy Hope this helps. If you don't want to use deb.torproject.org, everything required is also included in raspbian main repo: http://archive.raspbian.org/raspbian/pool/main/t/tor/ http://archive.raspbian.org/raspbian/pool/main/o/obfs4proxy/ http://archive.raspbian.org/raspbian/pool/main/libc/libcap2/ If you want to use raspbian repo, simply ignore the lines where you add deb.torproject.org to your sources.list file and just upgrade, install the required packages and modify your torrc file. Thanks for running a bridge. On 3/28/2015 11:47 PM, jchase wrote:
Hello, I run a bridge on a Raspberry Pi running Debian Wheezy and tor 0.2.4.26 . I have obfs3 installed and would like to upgrade to obfs4. So far this has not been possible. If I understand it correctly, my best bet is to update to tor 0.2.6.x and then install obfs4. Let me know if I'm wrong. And if I'm right, what is the easiest way to do that? Thanks, J. Chase _______________________________________________ tor-relays mailing list tor-relays@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays
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So far I have been building tor packages myself on the Pi, but your post made me check out out the repositories again. Unfortunately, it's still a bit of a mess: - The Tor Project repo has "armhf" builds only for old Tor versions, and I'm not sure if they are even meant for the Pi's processor (I didn't try). - The Raspbian repo has 0.2.5.11 tor package files, but apt only finds 0.2.4.26. - The Raspbian repo doesn't have a binary obfs4proxy package. Looks like I will keep building my own packages on the Pi for now, and run obfs3. Best regards, Alexander --- PGP Key: https://dietrich.cx/pgp | 0x727A756DC55A356B On 2015-03-28 23:19, s7r wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
Hi,
obfs4 will not run on 0.2.4.x , you need at least 0.2.5.x or 0.2.6.x
First, upgrade your Tor.
You can use torproject.org repositories. If you are running wheezy:
1. Add the repository: # echo "deb http://deb.torproject.org/torproject.org wheezy main" >> /etc/apt/sources.list
2. Add the signing key: # gpg --keyserver keys.gnupg.net --recv 886DDD89; gpg --export A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89 | apt-key add –
3. Install keyring: # apt-get update && apt-get -y install deb.torproject.org-keyring
Now upgrade your Tor, an apt-get -y install tor would upgrade to 0.2.5.1 1.
You can install obfs4proxy from deb.torproject.org too:
# echo "deb http://deb.torproject.org/torproject.org obfs4proxy main"
/etc/apt/sources.list # apt-get update && apt-get -y install obfs4proxy
Now, modify your torrc to enable the obfs4 transport. Make sure you also add ExtORPort auto in torrc so it will report some useful statistics. obfs4proxy also supports obfs3, and some users still use that, so if you can be an obfs3 and obfs4 bridge at the same time (requires just one more open port) it would be great.
Sample torrc entry for enabling obfs4 and obfs3: ExtORPort auto ServerTransportPlugin obfs3,obfs4 exec /usr/bin/obfs4proxy ServerTransportListenAddr obfs3 [::]:port ServerTransportListenAddr obfs4 [::]:port
To make the bridge even better, you can bind obfs3 and obfs4 to lower ports (< 1024), if you have them free, such as obfs3 on 80 and obfs4 on 443 (for example). This will help users behind really restrictive firewalls who only allow connections on few ports. You can easily do this with libcap2-bin package:
# apt-get -y install libcap2-bin # setcap 'cap_net_bind_service=+ep' /usr/bin/obfs4proxy
To make this persistent after a reboot, edit the /etc/rc.local file and add this line before 'exit 0': setcap 'cap_net_bind_service=+ep' /usr/bin/obfs4proxy
Hope this helps. If you don't want to use deb.torproject.org, everything required is also included in raspbian main repo:
http://archive.raspbian.org/raspbian/pool/main/t/tor/ http://archive.raspbian.org/raspbian/pool/main/o/obfs4proxy/ http://archive.raspbian.org/raspbian/pool/main/libc/libcap2/
If you want to use raspbian repo, simply ignore the lines where you add deb.torproject.org to your sources.list file and just upgrade, install the required packages and modify your torrc file.
Thanks for running a bridge.
On 3/28/2015 11:47 PM, jchase wrote:
Hello, I run a bridge on a Raspberry Pi running Debian Wheezy and tor 0.2.4.26 . I have obfs3 installed and would like to upgrade to obfs4. So far this has not been possible. If I understand it correctly, my best bet is to update to tor 0.2.6.x and then install obfs4. Let me know if I'm wrong. And if I'm right, what is the easiest way to do that? Thanks, J. Chase _______________________________________________ tor-relays mailing list tor-relays@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays
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participants (3)
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Alexander Dietrich -
jchase -
s7r