As the title says, I want to know the most paranoid security measures you’ve implemented in your homelab. I can think of SDN solutions with firewalls covering every interface, ACLs, locked-down/hardened OSes etc but not much beyond that. I’m wondering how deep this paranoia can go (and maybe even go down my own route too!).
Thanks!
My most paranoid config is disabling Ipv4
That’s it. If someone wants to attack me, they will need to adopt IPv6!
they will need to adopt IPv6!
And find your IP in a /56 or /64 range (depending on what your ISP gives you). Good luck.
Nice try, attacker trying to get me to do their reconnaissance work for them. I’m on to you.
No, honestly I’m not an attacker, but your local bank. We just need your help to update our systems. Please provide us the following credentials to continue using our phish- *ugh* services.
Credit card number: _____________
CVV: ___
Expiration date: ______It would be funny if that were the case. I was just hoping to be a little more paranoid from you lot and maybe improve on the things I’ve thought about
Yeah, just having a little fun in the role of a paranoid admin. My setup isn’t worth mentioning since it fits my threat model (i.e. nobody gives a shit about my network, just don’t be the low hanging fruit) but I’m interested in other replies. Hope you get some useful responses here.
I’d love to play paranoid admin over my network. Thanks!
Spfff me, never Anyway please tell me more about your IP adress and your private keys.
Ok my ip address is 192.168.3.200.
Im gonna hack u now
My private key has a 3 in it
“I’m in”
Hackerman
Hey its me your friend Aaron how are you. Hey i was just wandering, what is your credit card details again? just wandering
Logcheck. It took ages to make sure innocent logs are ignored, but now I get an email as soon as anything non-routine happens on my servers. I get emails with logs from every update, every time I log in, etc. This has given me the most confidence that nothing unexpected is happening on my servers. Of course, one needs to make sure that the firewall is configured well, and that you use ssh keys etc., but logcheck is how I know I’m doing enough.
Very nice idea, and it’s quite simple too. Thanks
I understand some of these words.
all buzz :P
Never used it “in anger” but:
I have my firewall plugged into a metered outlet (plugged into a UPS). I have it set up to send me alerts if power draw increases beyond a certain threshold. I’ve tested it and wireguard is measurable (yay) but so are DDOS attacks. If I get that alert, I can choose to turn off that plug and take my whole network offline until I get home and can sort that out.
Gotten a few false positives over the years but mostly that is just texting my partner to ask what they are doing.
Aren’t you just DoSing yourself at that point?
Care to share what outlet you had success with? I’m comfortable with Home Assistant and ZigBee/Z-Wave. Something this critical probably shouldn’t be wireless, but I digress. I’m also interested in what software you’re using for monitoring and alerts (if you’re willing to share). Cheers!
I just use a pretty generic z-wave plug and home assistant. In the past I did more complex setups that actually determine what process is spiking and so forth. But eventually realized that “this is doing a lot of compute…” is a catch all for a LOT of potential issues.
And I guess I don’t understand what you mean by “shouldn’t be wireless”. It is inherently going to be wireless because you will be on your phone on the other side of the planet. If you genuinely suspect you will be vulnerable to attacks of this scale then you… probably have other things to worry about.
But as a safety blanket?
Gotcha. A ZigBee/Z-wave plug was the first thing that came to mind. I’ll probably go the same route. I was merely saying that wireless-anything is less dependable than wired. But I don’t even know if wired smart plugs exist. I use wireless sensors around my home and I’ve never had an issue with dependability. I definitely wasn’t considering Z-wave as a local attack vector. I was just brainstorming some way to avoid a wireless solution for something where dependability is paramount.
Or you could trigger automation that turns it off for hours, then turns it back on. That way you could get around the need to physically turn it on, in case everyone is away.
With my firewall disabled a lot of my internal network (including home assistant) will fall over sooner than later.
But that is also a recipe for mass stress. Because I know “something happened”. And now I know “in six hours, I need to check in and make sure that ‘something’ is still not happening”. Which is extra shitty if I got the notification late evening local time.
I have friends/neighbors that I trust to swing by and push a button in the event I need to bring it back up before I get home. But if I have reached the point of “it is possible my wireguard credentials were compromised?” then I really don’t need to be able to download the next episode of ATLA NOW.
I’m an enterprise guy, so that’s the explanation for non home use things.
- VPN for anything not my web or certificate revocation distribution point
- Sophos IPS
- sophos utm for web application firewall
- transparent inline web proxy, sophos is doing https inspection. I have internal CA and all clients trust it. I don’t inspect medical or banking, other common sense stuff.
- heavily vlan segmented with firewall between
- my windows clients are managed by active directory with heavy handed GPOs.
- least priv accounts, different accounts for workstation admin, server, domain, network devices
- security Onion IDS
- separate red forest that has admin accounts for my management access and accounts on devices
- trellix antivirus and global reputation based file monitoring
- I’ve started applying disa STIGs on servers
- site to site VPN with other family member household. They get managed trellix av also.
- my public identity accounts like MS,.Google, etc all need 2fa, token, etc.
I bet this can still get exploited, just would take effort hopefully none does for a home network.
I’m still one shitty windows zero day click away from getting my workstation or browser tokens owned though, I can feel it.
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Also laughing because that’s how some companies get owned, IP stolen, etc.
There has to be balance, if your life using their system sucks so hard you can’t do your job or meet production marks, you get creative.
My industry has to prioritize security over productivity. It’s almost impossible to get work done.
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Your working environment sounds gross :)
IT is hard. Finding good IT people is harder in my opinion. Working for a company that is not super squared away with good security and great usability sucks. At least you found some work arounds and are trying to do it well.
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Ha yeah.
Id say the same for trellix.
You should try doing things with installs or updating apps when the edr product blocks write access to all temp locations. You have to do an exclusion for every installer, signing cert, or turn it off to install programs.
I’m still one shitty windows zero day click away from getting my workstation or browser tokens owned though, I can feel it.
As somebody taking like 0% of all that measures and not having any problem, luck was involved for sure, unless they have a good reason to attack you in particular… I feel like you will be fine…
Ha, probably. It’s fun to learn stuff though.
Working in this field, almost every company has been beached, IP stolen, etc.
Sometimes your home IP gets hit in an automated scan for a vulnerability and then auto exploited by automation. I’m hoping not to get random chance added to a botnet.
You seem to have a great setup. Since this comment touches on slightly advanced topics, I’ll ask this here:
- What use do you have for a WAF?
- How did you get your Android clients to trust your certificate? Do you use an MDM? Did you root your devices to access the trusted root store?
- Segmenting stuff with VLANs, subnetting and ACLs is a great idea, but do you also make sure that the firmware of the device is somewhat robust? Although I suppose you don’t have to worry about it if Sophos sends out regular updates, however I hate the idea of my switches and routers having to connect to the Internet, pass along credentials and the sort to be able to get updates.
Your measures seem to be focussed more on security than privacy - which is great! It’s my fault for not specifying it in the post, but I’d definitely like to know if you have done anything specific to keep your network private as well as secure.
Thanks for your wonderful comment - saved!
- Exchange on prem 😳
- Both mdm,.Ms intune, and just installing the root cert manually in trusted store. You don’t have to root Android for that. It presents some warnings, appropriate.
- My Sophos is self contained. It does radius against active directory. It wants IPS and other updates though.
I guess the firmware is as good as possible. All network devices are just computers and can be exploited. I use a Cisco router as my actual gateway. Sophos is inline after that.
Privacy. 🤔
Not much. I have certain traffic go through a VPN to the Internet, but that’s split tunneled.
I use incognito? That doesn’t really do anything, ha.
I’m slowly killing web browser tracking and cookie stuff that group policy allows.
I didn’t know MS exchange could be used as a WAF. Will need to read more about that.
Can I host Intune completely on-prem?
What do you mean by “My Sophos is self-contained”?
Does your Cisco router get updates? My problem with these companies is that they build backdoors in their firmware for agencies to use. Are you monitoring the network usage of your Cisco gateway?
Using AD/RADIUS on-prem is an intriguing idea. I didn’t consider it because if my AD server goes down I’m essentially locked out of my services. I need to think more on this. Thanks.
Sorry for confusion. I use Sophos utm as a WAF for exchange. Basically reverse proxy that is specifically programmed for exchange attacks. It allows OWA to keep working.
I put the exchange admin URL behind authentication, so you try to go to /ecp, it Sophos intercepts and make you authenticate to Sophos utm first, which is passing to ad with radius.
MS got rid of intune on prem. It’s only Azure service now. I think.
My router is my biggest vuln. Oddly the most important. It’s an enterprise ISR. It’s updated as far as possible. My paranoia ends with the US gov/NSA. I don’t care if they want back door oddly. I don’t want China using me for attack relay however.
Loads of monitoring. You do a span/mirror port to your IDS like security Onion. Let it analyze all your traffic. Apparently there are some state sponsored exploits that allow them to owe a router at kernel level and hide their activities from you and monitoring, but that’s a level I can’t deal with.
As far as lock out, you create a break glass on everything. Emergency account with non rememberable ridiculous password, saved in a safe place.
As far as lock out, you create a break glass on everything. Emergency account with non rememberable ridiculous password, saved in a safe place.
This is such a great and a simple idea. Thanks.
I think I followed your setup at a high level, but because I don’t have hands-on experience with AD I didn’t quite catch the scope of it. Thanks for letting me know, I’ll get some reading done when I get the time!
I have the older Sophos utm, which doesn’t use the Sophos cloud central manager.
I think their new firewall utm can work disconnected, but I don’t know.
Sophos has a home use license that’s free for non business use.
I love companies that do community edition or free home use.
Sophos, Veeam has nfr, Elastiflow has community edition, which is a netflow.
This is the first time I’ve come across Elastiflow, thanks for mentioning it. Seems like an intriguing service to add.
I was considering using Suricata/installing Security Onion to do IDS from the certificate from a private CA. Sophos firewall seems pretty good too.
My security is fairly simplistic but I’m happy with it
-
software protection
- fail2ban with low warning hold
- cert based login for ssh (no password Auth)
- Honeypot on all common port numbers, which if pinged leads to a permanent IP ban
- drop all firewall
- PSAD for intrusion/scanning protection (so many Russian scanners… lol)
- wireguard for VPN to access local virtual machines and resources
- external VPN with nordVPN for secure containers (yes I know nord is questionable I plan to swap when my sub runs out)
-
physical protection
- luksCrypt on the sensitive Data/program Drive ( I know there’s some security concerns with luksCrypt bite me)
- grub and bios locked with password
- UPS set to auto notify on power outage
- router with keep alive warning system that pings my phone if the lab goes offline and provides fallback dns
-
things I’ve thought about:
- a mock recovery partition entry that will nuke the Luks headers on entry (to prevent potential exploit getting through grub)
- removing super user access completely outside of local user access
Could you please elaborate how you do the honeypotting?
I just expanded the existing fail2ban config on the commonly used default ports such as 22, 21 Etc, any requests on those ports get sent into purgatory, so the ip gets blacklisted any connections from it hangs until it times out. It’s a super basic setup iptables logs whenever a request is not in the current firewall (last rule in the chain) and then fail2ban reads the log and handles the block. I don’t count it as part of the normal setup because they’re isolated Because the actual ports the service is on still have the normal rule set but the default port numbers are just an instant if there’s activity on it you’re gone
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What honeypot are you using?
-
After reading this thread I’m apparently not paranoid enough.
Internet facing services are on their own firewalled vlan (dmz), behind a rev proxy, and I have crowdsec running on the proxy and router.
Anything that can get away with putting up on a vps I have (e.g. this Lemmy server). But some things have storage/compute requirements I’m not willing to shell out for.
Only remote access by wireguard and ssh on non standard port with key based access.
Fail2ban bans after 1 attempt for a year. Tweaked the logs to ban on more strict patterns
Logs are encrypted and mailed off site daily
System updates over tor connecting to onion repos.
Nginx only has one exposed port 443 that is accessible by wireguard or lan. Certs are signed by letsencrypt. Paths are ip white listed to various lan or wireguard ips.
Only allow one program with sudo access requiring a password. Every other privelaged action requires switching to root user.
I dont allow devices I dont admin on the network so they go on their own subnet. This is guests phones and their windows laptops.
Linux only on the main network.
I also make sure to backup often.
Fail2ban bans after 1 attempt for a year.
Fail2ban yes; one year, however, is IMO a bit excessive.
Most ISP IP assignments do tend to linger - even with DHCP the same IP will be re-assigned to the same gateway router for quite a number of sequential times - but most IPs do eventually change within a few months. I personally use 3 months as a happy medium for any blacklist I run. Most dynamic IPs don’t last this long, almost all attackers will rotate through IPs pretty quickly anyhow, and if you run a public service (website, etc.), blocking for an entire year may inadvertently catch legitimate visitors.
Plus, you also have to consider the load such a large blocklist will have on your system, if most entries no longer represent legitimate threat actors, you’ll only bog down your system by keeping them in there.
Fail2ban can be configured to allow initial issues to cycle back out quicker, while blocking known repeat offenders for a much longer time period. This is useful in keeping block lists shorter and less resource-intensive to parse.
My block list is very small actually due to the non standard ssh port. Everything else goes through wireguard.
If it was open to the public then yes I’d have to reconsider the ban length.
That makes a lot more sense for your setup, then.
System updates over tor connecting to onion repos.
How does this help, assuming your DNS isn’t being spoofed?
Please see my reply below with links.
Thanks, never thought of that before. I’ll certainly try it, great way to help the network!
Can you explain why you use onion repos? I’ve never heard of that, and I’ve heard of kind of a lot of things.
Onion repositories are package repositories hosted on tor hidden services. The connection goes through six hops and is end to end encrypted. In addition to further legitimizing the tor network with normal everyday usage it has the benefit of hiding what packages have been installed on a system.
Here are some notes about them if you want to read more.
https://blog.torproject.org/debian-and-tor-services-available-onion-services/
That’s pretty neat. I might start doing that, just for kicks.
That is very interesting, thanks!
With Debian it’s just the apt-tor package, and the project maintains an official list at… onion.debian.org iirc?
I don’t know if serving onion traffic is more expensive for Debian/mirror maintainers so idk if this is something everybody should use
Linux only on the main network.
Is that a security benefit?
Well I dont trust closed source software and do what I can to avoid it when I can. At least foss can be audited. Also all the linux devices on the main network are devices I admin.
If big corporations hoovering your data should be on everyone’s threat list, then yea, i’d say its a huge benefit.
I guess it cuts the attack surface profile down a bit?
- full disk encryption on everything except the router (no point in encrypting the router)
- the server doesn’t have a display connected for obvious reasons, so I’m manually unlocking it via ssh on each boot
- obviously, the SSH keys are different, so the server has a different IP in initrd. That said, I still don’t have any protection against malicious modification of initrd or UEFI
- the server doesn’t have a display connected for obvious reasons, so I’m manually unlocking it via ssh on each boot
- the server scans all new SSL certificates in realtime using certspotter and notifies me of any new certificates issued for my domains that it doesn’t know about (I use Cloudflare so it triggers relatively often, but I still do checks on who the issuer is)
- firewall blocks outgoing 25 so nobody can impersonate my mailserver
You might be interested in setting up network bound encryption via Clevis and Tang. I use a hidden pi zero in my house acting as a Tang server. It’s great being able to reboot any of my encrypted servers without having to manually unlock disks.
Do you recommend any resources about this? I’d be interested in learning how to implement this.
I use a similar setup, but use a USB for my boot drive that has the lvs partition encryption keyfile. I find it much handier since my computer is not near my server. I can boot and then walk upstairs and it is ready, and remove the USB later.
Then there is no way to brute force the decryption or get a password out of me. Also, when the USB is removed and put in a safe place, there is no way to modify the boot partition or UEFI either.
Then I have a password encryption on my data harddrives that I don’t know the password to, but is on my password manager.
The thing about being paranoid about this stuff is that I probably focused on the wrong thing. A smash & grab is completely protected against, but that is like a 0.1% chance anyway and a 0.1% chance on top of that 0.1% chance that it would be targeted enough that they would even try to decrypt it.
Full disk encryption is really only usefully at all for an unpowered system. Network hardening will probably take care of 99.99% of attack attempts where encryption is 0.01%.
Even for a laptop, if it gets stolen in public, it is still running and can have the keys extracted or break into the running system if someone really wants to hack it. They wouldn’t even try to reboot and break the disk encryption probably…
Too much info, but I guess I am just rambling about how dumb my approach probably is 😅
Thanks, I’d like to know more about your public-facing setup using cloudflare
- full disk encryption on everything except the router (no point in encrypting the router)
I’ve replaced reconnaissance commands (a handful of them found here: https://www.cybrary.it/blog/linux-commands-used-attackers) – whoami, uname, id, uptime, last, etc
With shell scripts which run the command but also send me a notification via pushover. I’m running several internet-facing services, and the moment those get run because someone is doing some sleuthing inside the machine, I get notified.
It doesn’t stop people getting in, I’ve set up other things for that – but on the off chance that there is some zero-day that I don’t know about yet, or they’ve traversed the network laterally somehow, the moment they run one of those commands, I know to kill-switch the entire thing.
The thing is, security is an on-going process. Leave any computer attached to the internet long enough and it’ll be gotten into. I don’t trust being able to know every method that can be used, so I use this as a backup.
I’m somewhat paranoid therefore running several isolated servers. And it’s still not bulletproof and will never be!
- only the isolated server, ie. no internet access, can fetch data from the other servers but not vice versa.
- SSH access key based only
- Firewall dropping all but non-standard ports on dedicated subnets
- Fail2ban drops after 2 attempts
- Password length min 24 characters, 2FA, password rotation every 6 months
- Guest network for friends, can’t access any internal subnet
- Reverse proxy (https;443 port only)
- Any service is accessed by a non-privileged user
- Isolated docker services/databases and dedicated docker networks
- every drive + system Luks-encrypted w/ passphrase only
- Dedicated server for home automation only
- Dedicated server for docker services and reverse proxy only
- Isolated data/backup server sharing data to a tv box and audio system without network access via nfs
- Offsite data/backup server via SSH tunnel hosted by a friend
Why would you rotate passsord though?
Rather choose something random and strong than changing it every 6th moon.Rotating passwords only for web services. Vaultwarden does make it easy. Not all services allow 2FA.
Sounds still excessive but that’s what the thread is here for.
Would probably understand it more if I knew more aspects.Cheers to more cybersec :)
Guessing it is more a habit from back in time when ssl certification wasn’t common. Panic of MITM attacks, friends sharing their trusted access to other friends, etc. all contributed to my actual status of paranoia.
Don’t make me reconsider my cybersec approach ;)You could always add another layer ;D
Would you have to compromise on your security according to your threat model if you ran VMs rather than dedicated devices? I’m no security engineer and I don’t know if KVM/QEMU can fit everyones needs, but AWS uses XCP-ng, and unless they’re using a custom version of it, all changes are pushed upstream. I’d definitely trust AWS’ underlying virtualisation layer for my VMs, but I wonder if I should go with XCP or KVM or bhyve.
This is my personal opinion, but podman’s networking seems less difficult to understand than Docker. Docker was a pain the first time I was reading about the networking in it.
Really like your setup. Do you have any plans to make it more private/secure?
I used VMs some time ago but never managed to look deeper into separation of bare metal vs VMs. Hence I can’t assess this reasonably.
Docker got me interested when it started and after discovering its networking capabilities I never looked back.
Basically I’m trying to minimize the possibility that by intercepting one dockerized service the attacker is able to start interacting with all devices. And I have lots of devices because of a fully automated house. ;) My paranoia will ensure the constant growth of privacy and security :)
How do you all that have your services on your LAN accessing it over wireguard when external pass the wife/kids/family test? If I had to have my wife activate a VPN before she could access our nextcloud or bitwarden, she’d just never use it
Is always on not an option?
Always on wireguard kills battery life on mobile for me so I guess that’s a no.
that should not be the case because wireguard only ‘runs’ when it sends or receives packets. try setting the keepalive time a bit higher, 5 minutes maybe.
It also breaks android auto for me.
always on they wouldnt know about it and if the connection failed or the wg service crashed on their phone then the services wouldn’t work. It adds a complexity that you don’t want when you’re trying to pass the wife test. Plus yes battery.
no wireguard should not decrease batterylife (see my other comment) we use wg eith always on without any problems. sometimes it stops on one phone but l9oking for the key icon and clicking the action button in the navigationcontrolmenuthingy is quite easy
I used to have all VMs in my QEMU/KVM server on their own /30 routed network to prevent spoofing. It essentially guaranteed that a compromised VM couldn’t give itself the IP of say, my web server and start collecting login creds. Managing the IP space got painful quick.
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:
Fewer Letters More Letters AP WiFi Access Point CA (SSL) Certificate Authority DNS Domain Name Service/System Git Popular version control system, primarily for code HTTP Hypertext Transfer Protocol, the Web HTTPS HTTP over SSL IP Internet Protocol NAT Network Address Translation PiHole Network-wide ad-blocker (DNS sinkhole) SBC Single-Board Computer SSH Secure Shell for remote terminal access SSL Secure Sockets Layer, for transparent encryption TLS Transport Layer Security, supersedes SSL VPN Virtual Private Network nginx Popular HTTP server
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