Four days ago...
¡Hello there, dear souls! Days pass rapidly, exactly four days ago we're speaking about add another soldier, who's name was privoxy, in our personal battle with the infamous privacy cannibals, ¿do you remember?
Our new friend, could act like a layer 7 firewall, but in our last article we didn't any firewalling, only we rewrite the Refer HTTP header.
You have to know that some fantastic dudes maintained a public list of hosts that use our personal sensible data with the scope of monetizing it (¿have i give my permission to this abuse?) . The name of the list is easylist and you can navigate to the home site of the project here. Normally is used with browsers extensions to grant ad-free navigation to his users. But we're deep users and we want to use the list in ours privoxy rules. The problem is that this is not so simple. There is a project on the fantastic github that could help us in doing that, but it use a language not installed by default in our OpenBSD, the name of the language is haskell, a standardized, general-purpose purely functional programming language. Here is some links to the project:
Haskell can be installed on OpenBSD but adblock2privoxy want The stack package that i couldn't correctly compile under OpenBSD.
That's the reason why i take my OpenBSD and we go to the up of the Alps to meet with another good friend, another security guy, Alpine linux.
Install Alpine linux under OpenBSD vmm
We're lucky, or the karma is in love with us (we're also in love with you), because a few months ago OpenBSD introduce in his base tree the virtual machine monitor vmm. But karma help us more than this, because it's just very few months that under vmm we can virtualize linux, read here.
Ok, let's start with prepare the correct environment for our new friend:
Download Alpine minimal ISO image, to use in virtual environment, and create a virtual disk of 10GB:
$ wget http://dl-cdn.alpinelinux.org/alpine/v3.7/releases/x86_64/alpine-virt-3.7.0-x86_64.iso
$ vmctl create alpine-virt.img -s 10G
Enable routing in our OpenBSD:
$ doas sysctl net.inet.ip.forwarding=1
# echo "net.inet.ip.forwarding=1" >> /etc/sysctl.conf
Create virtual switch vether0:
# echo "inet 10.1.10.1 255.255.255.0" > /etc/hostname.vether0
# cat > /etc/vm.conf << EOF
switch "local" {
add vether0
up
}
EOF
Enable vmd on boot, enable it and download the virtual BIOS:
$ doas rcctl enable vmd
$ doas rcctl start vmd
$ doas fw_update
Indicate dns service of Tor to listen in the vether0 interface and restart it:
# echo 'DNSPort 10.1.10.1:53 IsolateDestPort' >> /etc/tor/torrc
$ doas rcctl restart tor
Create a dedicated privoxy for our new friend, Alpine:
$ doas cp -p /etc/rc.d/privoxyfirefox /etc/rc.d/privoxyvesta
# cat > /etc/privoxy/vesta << EOF
# Sample Configuration File for Privoxy 3.0.26
#
# $Id: config,v 1.112 2016/08/26 13:14:18 fabiankeil Exp $
#
# Copyright (C) 2001-2016 Privoxy Developers https://www.privoxy.org/
#
user-manual https://www.privoxy.org/user-manual/
trust-info-url https://learn.canva.com/wp-content/uploads/2015/06/50-Of-The-Most-Creative-404-Pages-On-The-Web-01.png
admin-address r.giuntoli@protonmail.ch
#config guide
#proxy-info-url http://www.example.com/proxy-service.html
confdir /etc/privoxy
templdir /etc/privoxy/templates
logdir /var/log/privoxy
actionsfile match-all.action # Actions that are applied to all sites and maybe overruled later on.
actionsfile default.action # Main actions file
actionsfile user.action # User customizations
filterfile default.filter
filterfile user.filter # User customizations
logfile privoxyvesta.log
#if set all deny but the ones listed on [use ~ like *]
#trustfile trust
#
# debug 1 # Log the destination for each request Privoxy let through. See also debug 1024
# debug 2 # show each connection status
# debug 4 # show I/O status
# debug 8 # show header parsing
# debug 16 # log all data written to the network
# debug 32 # debug force feature
# debug 64 # debug regular expression filters
# debug 128 # debug redirects
# debug 256 # debug GIF de-animation
# debug 512 # Common Log Format
# debug 1024 # Log the destination for requests Privoxy didn't let through, and the reason why.
# debug 2048 # CGI user interface
# debug 4096 # Startup banner and warnings.
# debug 8192 # Non-fatal errors
# debug 32768 # log all data read from the network
# debug 65536 # Log the applying actions
debug 1 # Log the destination for each request Privoxy let through. See also debug 1024.
#debug 1024 # Actions that are applied to all sites and maybe overruled later on.
#debug 4096 # Startup banner and warnings
#debug 8192 # Non-fatal errors
single-threaded 0
hostname Lutetia.unknown_domain
listen-address 10.1.10.1:8812
#filter mode
toggle 1
enable-remote-toggle 0
#filter by X-filter http header
enable-remote-http-toggle 0
enable-edit-actions 0
enforce-blocks 1
# src_addr[:port][/src_masklen] [dst_addr[:port][/dst_masklen]]
permit-access 10.1.10.2
buffer-limit 8192
#enable if there's a parent proxy
enable-proxy-authentication-forwarding 0
forward-socks5 / 127.0.0.1:9912 .
forwarded-connect-retries 0
#transparent proxy
accept-intercepted-requests 0
#
allow-cgi-request-crunching 0
split-large-forms 0
# grow up to 300 (if browser hang stop)
keep-alive-timeout 5
# disable if problems
tolerate-pipelining 1
#default-server-timeout 60
connection-sharing 0
# try to reduce to 5 sec
socket-timeout 300
#max-client-connections 256
handle-as-empty-doc-returns-ok 0
#enable-compression 1
#compression-level 3
#client-header-order Host \
# Accept \
# Accept-Language \
# Accept-Encoding \
# Proxy-Connection \
# Referer \
# Cookie \
# DNT \
# If-Modified-Since \
# Cache-Control \
# Content-Length \
# Content-Type
#
#client-specific-tag circumvent-blocks Overrule blocks but do not affect other actions
# disable-content-filters Disable content-filters but do not affect other actions
#
#
# client-tag-lifetime 180
# # IP address with a X-Forwarded-For header.
# trust-x-forwarded-for 1
EOF
$ doas rcctl enable privoxyvesta
$ doas rcctl set privoxyvesta flags=/etc/privoxy/vesta
$ doas rcctl start privoxyvesta
And prepare pf for the new services opened on vether0:
# cat >> /etc/pf.conf << EOF
pass in on vether0 proto tcp from 10.1.10.2 to 10.1.10.1 port 8812
pass in on vether0 proto udp from 10.1.10.2 to 10.1.10.1 port 53
EOF
$ doas pfctl -f /etc/pf.conf
Notice that we don't NAT connections from Alpine linux vesta, it will only arrive in Internet by the use of our privoxy dedicated instance.
Alpine under OpenBSD, the video
Now, using this guide we are going to install our Alpine under the OpenBSD
...to be continued... and yes I LOVE YOU