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diff --git a/content/blog/freebsd/factorio-to-nas.md b/content/blog/freebsd/factorio-to-nas.md new file mode 100644 index 0000000..801e361 --- /dev/null +++ b/content/blog/freebsd/factorio-to-nas.md @@ -0,0 +1,224 @@ +--- +title: Exposing a FreeBSD jail through wireguard +description: Migrating my Factorio jail to my home network, routing the traffic from the internet facing vps through wireguard +date: 2023-01-07 +tags: +- Factorio +- FreeBSD +- jail +- wireguard +--- + +## Introduction + +In a previous blog article, I detailed how I [run a Factorio linux jail]({{< ref "factorio-server-in-a-linux-jail.md" >}}) on a small vps (1 vcpu and 2G of ram). After some time growing our bases on the same map with a friend, we started to see the limits of this small server. As I do not have a cloud server more powerful, I chose to migrate this to a former home server (4 cores and 8G of ram). + +Since it is on my home network and no longer facing the internet, I needed a way to still expose it from the vps and chose to use wireguard and some pf rules to do so: + + + +## Preparing the home server + +All this is automated with ansible for me, but here is a breakdown of the required configuration. + +### Jail Networking + +I strive for the simplest setup and this jail just needs the legacy loopback interface way of doing things: +```sh +echo 'cloned_interfaces="lo1"' >> /etc/rc.conf +service netif cloneup +``` + +Many jail tutorials will tell you to configure the jail ips in `/etc/rc.conf` too, this is not what I do. It is difficult to automate and I find that having those ips in the `jails.conf` file is a lot more flexible. + +### Wireguard + +Installing wireguard is as easy as: +```sh +pkg install wireguard +``` + +The private and public keys for a host can be generated with the following commands: +```sh +PRIVATE_KEY=`wg genkey` +PUBLIC_KEY=`printf $PRIVATE_KEY|wg pubkey` +echo private_key: $PRIVATE_KEY +echo public_key: $PUBLIC_KEY +``` + +Here is a configuration example of my `/usr/local/etc/wireguard/wg0.conf` that creates a tunnel listening on udp port 342 and has one remote peer: +```cfg +[Interface] +PrivateKey = MzrfXLmSfTaCpkJWKwNlCSD20eDq7fo18aJ3Dl1D0gA= +ListenPort = 342 +Address = 10.1.2.5/24 + +[Peer] +PublicKey = R4A01RXXqRJSY9TiKQrZGR85HsFNSXxhRKKEu/bEdTQ= +Endpoint = 168.119.114.183:342 +AllowedIPs = 10.1.2.2/32 +PersistentKeepalive = 60 +``` + +To implement this example you will need to generate two sets of keys. The configuration for the first server will feature the first server's private key in the `[Interface]` section and the second server's public key in the `[Peer]` section, and vice versa for the configuration of the second server. + +The `PersistentKeepalive` and `Endpoint` entries are only for the home server, the internet facing vps should not have those. + +To activate the interface configuration, use : +```sh +service wireguard enable +echo 'wireguard_interfaces="wg0"' >> /etc/rc.conf +service wireguard start +``` + +### pf firewall + +Here is the `/etc/pf.conf` of my home server. It differs from the one on the internet facing vps because it needs to be reachable from my private network: +```cfg +scrub in all + +table <jails> persist +table <myself> const { self } +table <private> const { 10/8, 172.16/12, 192.168/16, fd00::/8 fe80::/10 } +table <internet> const { 0.0.0.0/0, !10/8, !172.16/12, !192.168/16, ::/0, fe80::/10, !fd00::/8 } + +##### Basic rules ##### +nat pass on egress from <jails> to <internet> -> (egress:0) +rdr-anchor "rdr/*" +set skip on lo +block return log + +##### This firewall ##### +block drop in on egress +pass inet proto icmp all icmp-type unreach code needfrag # MTU path discovery +pass inet proto icmp all icmp-type { echoreq, unreach } # echo reply +pass inet6 proto icmp6 all + +pass in on egress proto tcp from <private> to <myself> port { ssh, http, https, smtp, smtps, submission } +pass out from <myself> to any + +##### VPNs ##### +pass in on egress proto udp from <internet> to <myself> port 342 +pass in on wg0 from <private> to <myself> +pass out on wg0 from <myself> to <private> +``` + +### Linux subsystem + +```sh +service linux enable +service linux start +``` + +## Migrating the jail + +Migrating the jail was relatively easy. First I needed to stop the jail and unmount the linux filesystems: +```sh +service jail stop factorio +umount /jails/factorio/proc +umount /jails/factorio/sys +``` + +Then rsync did the trick *(here on the home server) with: +```sh +mkdir /jails +rsync -SHaX factorio.adyxax.org:/jails/factorio /jails/ +``` + +I migrated the linux fstab entries from one server to the other: +```cfg +linprocfs /jails/factorio/proc linprocfs rw,late 0 0 +linsysfs /jails/factorio/sys linsysfs rw,late 0 0 +``` + +I mount these filesystems on the home server: +```sh +mount /jails/factorio/proc +mount /jails/factorio/sys +``` + +I migrated the `/etc/jail.conf.d/factorio.conf` configuration. I needed to adjust the pf prestart rules to include `wg0` in addition to `egress` interface (I keep the egress interface to be able to connect locally too): +```cfg +factorio { + host.hostname = "factorio"; + path = /jails/$name; + ip4.addr = 127.0.1.1/32; + ip6 = "new"; + ip6.addr = fc00::1/128; + exec.system_user = "root"; + exec.jail_user = "root"; + exec.clean; + exec.prestart = "ifconfig lo1 alias ${ip4.addr}"; + exec.prestart += "ifconfig lo1 inet6 ${ip6.addr}"; + exec.prestart += "/sbin/pfctl -t jails -T add ${ip4.addr}"; + exec.prestart += "/sbin/pfctl -t jails -T add ${ip6.addr}"; + exec.prestart += "echo \"rdr pass on { egress, wg0 } inet proto udp from any to port 34197 -> ${ip4.addr}\n rdr pass on { egress, wg0 } inet6 proto udp from any to port 34197 -> ${ip6.addr}\" | pfctl -a rdr/jail-$name -f -"; + exec.poststop = "/sbin/pfctl -t jails -T del ${ip4.addr}"; + exec.poststop += "/sbin/pfctl -t jails -T del ${ip6.addr}"; + exec.poststop += "pfctl -a rdr/jail-$name -F nat"; + exec.poststop += "ifconfig lo1 inet ${ip4.addr} -alias"; + exec.poststop += "ifconfig lo1 inet6 ${ip6.addr} -alias"; + exec.start = "/bin/su - factorio -c 'factorio/bin/x64/factorio --start-server factorio/saves/meganoobase.zip' &"; + exec.stop = "pkill factorio ; sleep 15"; + mount.devfs; +} +``` + +Here are the necessary bits for `/etc/rc.conf`: +```sh +echo 'jail_enable="YES" +jail_list="factorio" +service jail start factorio +``` + +## pf forwarding rules on the internet facing vps + +There are two nat rules necessary: +```cfg +rdr pass on egress inet proto udp from <internet> to <myself> port 34197 -> 10.1.2.2 # factorio TODO ipv6 +nat pass on wg0 inet proto udp from <internet> to 10.1.2.2 port 34197 -> (wg0:0) +``` + +The first rule rewrites the destination IP of the incoming internet traffic to the wireguard IP of the home server. The second rule rewrites their source IP to the wireguard IP of the internet facing vps. + +Since we a routing packets, make sure it is enabled in your `/etc/sysctl.conf`: +```sh +sysctl net.inet.ip.forwarding=1 +echo 'net.inet.ip.forwarding=1 >> /etc/sysctl.conf' +``` + +Here is the whole pf configuration as an reference: +```cfg +scrub in all + +table <jails> persist +table <myself> const { self } +table <private> const { 10/8, 172.16/12, 192.168/16, fd00::/8 fe80::/10 } +table <internet> const { 0.0.0.0/0, !10/8, !172.16/12, !192.168/16, ::/0, fe80::/10, !fd00::/8 } + +##### Basic rules ##### +nat pass on egress from <jails> to <internet> -> (egress:0) +rdr-anchor "rdr/*" +rdr pass on egress inet proto udp from <internet> to <myself> port 34197 -> 10.1.2.2 # factorio TODO ipv6 +nat pass on wg0 inet proto udp from <internet> to 10.1.2.2 port 34197 -> (wg0:0) +set skip on lo +block return log + +##### This firewall ##### +block drop in on egress +pass inet proto icmp all icmp-type unreach code needfrag # MTU path discovery +pass inet proto icmp all icmp-type { echoreq, unreach } # echo reply +pass inet6 proto icmp6 all + +pass in on egress proto tcp from <internet> to <myself> port { ssh, http, https, smtp, smtps, submission, 1337 } +pass out from <myself> to any + +##### VPNs ##### +pass in on egress proto udp from <internet> to <myself> port 342 +pass in on wg0 from <private> to <myself> +pass out on wg0 from <myself> to <private> +``` + +## Conclusion + +I love FreeBSD and I love wireguard: it all works perfectly. This blog post is rather long because I got caught up detailing everything, but if something is unclear or if some piece seems missing do not hesitate to [contact me]({{< ref "about-me.md" >}}#how-to-get-in-touch). diff --git a/static/static/factorio-wireguard.drawio.svg b/static/static/factorio-wireguard.drawio.svg new file mode 100644 index 0000000..9432b62 --- /dev/null +++ b/static/static/factorio-wireguard.drawio.svg @@ -0,0 +1,3 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> +<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="409px" height="295px" viewBox="-0.5 -0.5 409 295" content="<mxfile host="app.diagrams.net" modified="2023-01-07T22:47:10.934Z" agent="5.0 (X11)" etag="PowjzcyRRVuM5-xDcO5B" version="15.1.2" type="device"><diagram id="ZPRT6O2qIPaLcVj74FYs" name="Page-1">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</diagram></mxfile>"><defs/><g><path d="M 195 183 L 195 123" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="stroke"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe flex-start; width: 1px; height: 1px; padding-top: 180px; margin-left: 197px;"><div style="box-sizing: border-box; font-size: 0; text-align: left; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #839496; line-height: 1.2; pointer-events: all; white-space: nowrap; "><div>Public IP<br /></div></div></div></div></foreignObject><text x="197" y="180" fill="#839496" font-family="Helvetica" font-size="11px">Public IP
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