Context: Would YOU donate your idle CPU cycles to TankieTube?
Linux Steps
*Feel free to ask me any questions by PM, email, or commenting here.*
1. Install dependencies
Debian
$ sudo apt update
$ sudo apt install nodejs npm ffmpeg
$ sudo npm install -g @peertube/peertube-runner
Arch Linux
$ sudo pacman -Syu nodejs npm ffmpeg
$ sudo npm install -g @peertube/peertube-runner
2. Create the dedicated system user
$ sudo useradd -m -d /srv/prunner -s /bin/bash -p <random_password> prunner
3. Create the systemd unit
$ sudo nano /etc/systemd/system/prunner.service
Paste and save this.
spoiler
[Unit]
After=network.target
Description=PeerTube runner daemon
[Service]
CapabilityBoundingSet=~CAP_SYS_ADMIN
Environment=NODE_ENV=production
ExecStart=peertube-runner server --enable-job vod-web-video-transcoding --enable-job vod-hls-transcoding --enable-job vod-audio-merge-transcoding
Group=prunner
LockPersonality=true
NoNewPrivileges=true
PrivateDevices=false
PrivateMounts=true
PrivateTmp=true
ProtectClock=true
ProtectControlGroups=true
ProtectHome=true
ProtectHostname=true
ProtectKernelLogs=true
ProtectKernelModules=true
ProtectKernelTunables=true
ProtectProc=invisible
ProtectSystem=strict
ReadWritePaths=/srv/prunner
Restart=always
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
RestrictNamespaces=true
RestrictSUIDSGID=true
SyslogIdentifier=prunner
SystemCallArchitectures=native
Type=simple
User=prunner
WorkingDirectory=/srv/prunner
[Install]
WantedBy=multi-user.target
4. Enable & start the systemd unit
Starting the process for the first time will generate the config file.
$ sudo systemctl daemon-reload
$ sudo systemctl enable prunner.service
$ sudo systemctl restart prunner.service
5. Edit the config file
$ sudo nano /srv/prunner/.config/peertube-runner-nodejs/default/config.toml
a. Under [jobs], set concurrency equal to the number of virtual cores your CPU has.
b. Under, [], set threads = 1.
c. Save and exit.
6. Restart to load the configuration changes
$ sudo systemctl restart prunner.service
7. Email TankieTanuki@tankie.tube
a. OpSec: Use an email detached from your legal identity. Attachment to your Hexbear/Lemmy username is optional.
b. Put "TinyTanks" in the subject line.
c. In the body, request a nickname for your runner.
d. I'll reply with the final command to enter, which includes your secret token!
Windows/MacOS/Docker
*Comrades are welcome to contribute steps for alternate installations. I'm only good with Linux.*
·6 days agoProtectSystem=full
Why can't this be "strict"? What directories does prunner need to write to?
If it's just WorkingDirectory, a
ReadWritePaths=/srv/prunneris all that is needed.Edit: If anyone want's to actually run this, I can help you harden the systemd service.
prunner only needs to write inside its home directory.
I changed ProtectSystem to strict. Thanks for the suggestion.
What other edits do you recommend?
With ProtectSystem=strict you also need
ReadWritePaths=/srv/prunner, WorkingDirectory is not excluded from being read-only.I could recommend a lot of stuff.
Feel free to rewrite it and I'll test it out on my runners. I only know systemd basics.
This is a list of things that could help harden, some of these I am not as sure about
PrivateTmp=true # Does prunner use tmp? Does ffmpeg use tmp? PrivateMounts=true # prunner/ffmpeg shouldn't need to mount stuff anyways... right? ProtectClock=true # prunner and ffmpeg do not need to set hardware clock ProtectKernelTunables=true # "Few services need to write to these at runtime" ProtectKernelModules=true # I don't see prunner/ffmpeg needing to mod_probe ProtectKernelLogs=true # prunner/ffmpeg do not need to write to dmesg ProtectControlGroups=true # Not a container manager ProtectProc=invisible # Keep an eye out RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 # Other socket types are rare LockPersonality=true # prunner/ffmpeg shouldn't need to change personality? #MemoryDenyWriteExecute=true # Wait, prunner is a JS app isn't it? Hoping no JIT is needed **EDIT**: Yes, this is a problem RestrictSUIDSGID=true # No privilege elevation RestrictNamespaces=true # ffmpeg does not need namespaces SystemCallArchitectures=native # hardens other options ProtectHostname=true # Actually, seems like it might not be a problem. Hostname is "copied from callers namespace" # Not setting: # PrivateUsers=true # Meh. Problem I had with it in bind should not be the case here. If you feel like it, try it out. # SystemCallFilter # Can't be bothered to go through the list # ProcSubset=pid # Kernel APIs, not sure if ffmpeg needs them # PrivateDevices=true # afraid ffmpeg needs it # RestrictRealtime=true # prunner sets the niceness of ffmpegI've made some changes between when I posted it and now (actually I just made a change, ProtectHostname) so make sure you get everything.
I tried setting it up myself, I was correct that MemoryDenyWriteExecute would be a problem.
Yea, make sure to
journalctl -eu prunnerevery time you restart it to check the logsAll these systemd options are documented in the man page, see https://man7.org/linux/man-pages/man5/systemd.exec.5.html
ProtectSystem is full, not strict. Otherwise seems fine
Will it be able to write inside /srv/prunner if that's set to strict?
If you add the ReadWritePaths I told you to
Btw, once these options are added, you can run
systemd-analyze security prunnerto check which options haven't been enabled (it doesn't know if it should be enabled though. Add --no-pager if you want to copy it)--no-pager Do not pipe output into a pager.What's a pager? You mean those things people used to wear on their belts before cellphones were commonplace?
As the name implies, roughly a pager is a piece of software that helps the user get the output one page at a time, by getting the size of rows of the terminal and displaying that many lines.
The most popular pagers in a UNIX text environment are
moreandless. The latter is kind of a joke aslesscan actually do more thenmore.https://unix.stackexchange.com/questions/144016/what-is-a-pager
Oh, I see! Page like in pagination. Now I know the proper name for less's function. 🙂 Thanks!
I have an old computer I may be able to setup for this, however it's an old prebuilt desktop for web browsing. If it's too weak would it be a waste of time to try this?
This seems more like the sort of thing to run on something you can periodically nuke, and maybe put behind an external firewall that only allows communication with the tankietube servers. Maybe some comrades have spare credit on a cloud provider that would be suited for this.
Also do you know how valid the security concerns are? I did not know ffmpeg had vulnerabilities. Additionally would using the linux equivalent of hosts file + windows firewall be adequate enough or would something more advanced be minimum?
This is assuming the computer still works and I can get linux running. Also tinytanks is a really cute name
The TinyTanks program is horizontal scaling, which means that every TinyTank, no matter how smol, is CREDIT TO TEAM!
I don't think it's anything to be concerned about TBH.
Would anybody prefer a bash script to these series of steps?
Edit: Yeah I'm gonna do that.
i'm learning a lot today
