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I asked this on "ask Ubuntu" and had much luck yet, so I thought I might try here as well https://askubuntu.com/questions/409660/dnscrypt-proxy-works-but-with-incorrect-permissions

I have successfully installed and find myself in the middle of configuring dnscrypt-proxy on ubuntu 13.10 x64. However, I am running into some issues with permissions in general.

I have added a user with the following commmand:

sudo adduser --system --quiet --home /run/dnscrypt --shell /bin/false --group --disabled-password --disabled-login dnscrypt

and issued dnscrypt-proxy --daemonize --user=dnscrypt but without success. So i tried just --daemonize and finally just dnscrypt-proxy which resulted in a UDP bind permission error. Ran it as root and the error goes away. dnscrypt-proxy --user=dnscrypt results in the error returning. I'm guessing its failing because of some permission, but don't have a clue where to start or what to change at this point.

also i would like to run this at network startup or after login. which i think i can manage, but if you have a suggestion it would just save me time. I don't understand why I can't run this as --user=dnscrypt but root works fine. (I mean, I understand why root works ;D)

edit: Just to clarify a little more, I'm actually running elementary OS luna 0.2, which is based on ubuntu 13.10 (I believe)

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You need to create an init script that should use start-stop-daemon to drop the privileges.

The app probably requires raw socket access and for such an operation root (or CAP_SOCK) is required. It is not possible as a normal user.

This link should be quite usefull: http://linuxmint.tumblr.com/post/29714225010/installing-dnscrypt

  • Couldn't it also be that ports under 1024 can't be used by non-root users? – LawrenceC Jan 24 '14 at 15:55
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The solution is to correctly set cap_net_bind_service on the dnscrypt-proxy binary so that it can bind to port 53 while running as the non root (dnscrypt) user:

setcap cap_net_bind_service=+pe /path/to/dnscrypt-proxy

If you run dnscrypt-proxy inside an lxc container the above command will need to be executed from the host.

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