mirror of
https://github.com/mikaela/mikaela.github.io/
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Mikaela Suomalainen
4f7cbfe023
It turns out that sometimes the cache and log directories don't get created so creating them must be documented. The other is just fixing a link that was previously broken.
133 lines
5.0 KiB
Markdown
133 lines
5.0 KiB
Markdown
---
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layout: post
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comments: true
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title: "dnscrypt-proxy v2 on Debian/Ubuntu quickly, dirtily"
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category: [english]
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tags: [english, dnscrypt, dns, dnscrypt-proxy]
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redirect_from:
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- /dnscrypt.html
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- /dnscrypt-proxy.html
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- /english/2018/10/21/dnscrypt-proxy-quick-dirty-debian.html
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---
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*DNSCrypt-proxy encrypts DNS queries that would otherwise go in plaintext
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ensuring that they won't be seen or modified by anyone in the middle. It
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works as a localhost DNS server sending queries to configured DNS
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resolvers.*
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I guess I should also say why you would want dnscrypt v1 vs v2. V1 which
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is in most of repos currently uses broken resolver by default and only
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supports one resolver at a time, while v2 can use multiple of them while
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comparing them for the best ones.
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This post is on getting v2 to Debian Stable and Ubuntu pre 18.10 which
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contain v1 and I (sadly) don't know a better way to do this.
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In order to check which version your distro has available, check the
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dnscrypt-proxy search page for your distribution:
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* [Debian](https://packages.debian.org/dnscrypt-proxy)
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* 2018-11-03: the version in *stretch (stable)* is `1.9.4-1` which has
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the issues why I wrote this post.
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* [Ubuntu](https://packages.ubuntu.com/dnscrypt-proxy)
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* 2018-11-03: I cannot find dnscrypt-proxy from Ubuntu at all, while I
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am sure it previously had the Debian version 1.
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* * * * *
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1. Update your local apt cache `sudo apt update` and install curl that will
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be used for downloading the package from Debian `sudo apt-get install curl`
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Check the version number at [Debian's dnscrypt-proxy package download page](https://packages.debian.org/sid/amd64/dnscrypt-proxy/download) and fix it
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below:
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2: download the package`curl -LO https://deb.debian.org/debian/pool/main/d/dnscrypt-proxy/dnscrypt-proxy_2.0.16-2_amd64.deb`
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**WARNING: This part is not supported by either Debian or Ubuntu, you are
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taking a package from another distribution and attempting to install it
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on another.**
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**WARNING: Usually when you use apt, it will verify package signatures and
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ensure that the package hasn't been tampered with. I have no idea how to
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do that with direct downloads (if it's even possible) so you will be
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trusting the Debian repository mirror or CDN blindly.**
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3. install the package you downloaded: `sudo dpkg -i dnscrypt-proxy<TAB>`
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(TAB (above capslock) automatically completes rest of the filename for
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you).
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1. In case there was a problem, attmept `sudo apt-get install -f` to fix
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broken package depedencies. **Remember to check that what it suggests
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looks reasonable!** If it asks to remove dnscrypt-proxy, you are out
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of luck and should do that instead of attempting to replace important
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system components from another distribution (creating
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"Frankendebian").
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Hopefully dnscrypt-proxy is now running, check
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`journalctl -u dnscrypt-proxy`, there should be a line saying
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`[NOTICE] Wiring systemd TCP socket #0, dnscrypt-proxy.socket, 127.0.2.1:53`
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Edit `/etc/NetworkManager/NetworkManager.conf` to avoid overlapping
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resolvers breaking each other, it should say say `dns=none`
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e.g.:
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```
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[main]
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plugins=ifupdown,keyfile
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dns=none
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```
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if it doesn't say dns=none, fix it and restart it with:
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`systemctl restart NetworkManager`
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Edit your /etc/resolv.conf, for example:
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```
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sudo su -
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rm /etc/resolv.conf
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nano /etc/resolv.conf && chattr +i /etc/resolv.conf
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```
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chattr +i will prevent modifying the file unless chattr -i is done first.
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Example resolv.conf:
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```
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nameserver 127.0.2.1
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options edns0 single-request-reopen
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#search mikaela.info
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```
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Nameserver is the host where dnscrypt-proxy said to be listening on in
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journalctl, options are from dnscrypt-proxy documentation and search means
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domains that are automatically searched for if you don't use fully
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qualified domain names, e.g. `ssh machine` in my (uncommented) config
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would turn into `ssh machine.mikaela.info`.
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You should also tell dhclient to not touch resolv.conf or you may get many
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files into `/etc` beginning with names `resolv.conf.dhclient-new.`
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according to
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[Debian wiki](https://wiki.debian.org/resolv.conf#Stop_dhclient_from_modifying_.2Fetc.2Fresolv.conf) which gives the following two commands and
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[Debian bug 860928](https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=860928):
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```bash
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echo 'make_resolv_conf() { :; }' > /etc/dhcp/dhclient-enter-hooks.d/leave_my_resolv_conf_alone
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chmod 755 /etc/dhcp/dhclient-enter-hooks.d/leave_my_resolv_conf_alone
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```
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* * * * *
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**WARNING from 2018-10-21!** It appears that the cache and log directories
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of dnscrypt-proxy don't sometimes get created automatically (at least on
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Debian GNU/Linux 9.6 (stretch).
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If this happens to you or you would like to be sure to get them:
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```
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sudo mkdir -p /var/cache/dnscrypt-proxy/ /var/log/dnscrypt-proxy/
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sudo chown -R _dnscrypt-proxy:nogroup /var/cache/dnscrypt-proxy /var/log/dnscrypt-proxy
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```
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* * * * *
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For the curious my dnscrypt-proxy config [is in my shell-things repository](https://github.com/Mikaela/shell-things/tree/master/etc/dnscrypt-proxy) [mirror](https://gitea.blesmrt.net/mikaela/shell-things/src/branch/master/etc/dnscrypt-proxy).
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