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GreenKnight23@lemmy.world ⁨6⁩ ⁨days⁩ ago

this is the second time I’ve seen a post like this.

docker has always been like this. if it’s news to you then you must be new to docker.

if you’re using the built in firewall to secure your system on your wan, you’re doing it wrong. get a physical firewall. if you’re doing it to secure your lan then you just need to put in some proper routes and let your hardware firewall sort it out with some vlans.

don’t rely on firewalld or iptables for anything.

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lukecyca@lemmy.ca ⁨6⁩ ⁨days⁩ ago
What if you rent a bare metal server in a data center? Or rent a VPS from a basic provider that expects you to do your own firewalling? Or run your home lab docker host on the same vlan as other less trusted hosts?

It would be nice if there was a reliable way to run a firewall on the same host that’s running docker.

You may say these are obscure use cases and that they are Wrong and Bad. Maybe you’re right, but personally I think it’s an unfortunate gap in expected functionality, if for no other reason than defense-in-depth.

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- GreenKnight23@lemmy.world ⁨6⁩ ⁨days⁩ ago
  
  What if you rent a bare metal server in a data center?
  
  any msp will work with your security requirements for a cost. if you can’t afford it, then you shouldn’t be using a msp.
  
  Or rent a VPS from a basic provider that expects you to do your own firewalling?
  
  find a better msp. if a vendor you’re paying tells you to fuck off with your requirements for a secure system, they are telling you that you don’t matter to them and their only goal is to take your money.
  
  Or run your home lab docker host on the same vlan as other less trusted hosts?
  
  don’t? IDK what to tell you if you understand what a vlan is and still refuse to set one up properly to segment your network securely.
  
  It would be nice if there was a reliable way to run a firewall on the same host that’s running docker.
  
  don’t confuse reliable with convenient. iptables and firewalld are not reliable, but they are certainly convenient.
  
  You may say these are obscure use cases and that they are Wrong and Bad. Maybe you’re right, but personally I think it’s an unfortunate gap in expected functionality, if for no other reason than defense-in-depth.
  
  poor network architecture is no excuse. do it the proper way or you’re going to get your shit exposed one day.
  
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  - slazer2au@lemmy.world ⁨6⁩ ⁨days⁩ ago
    
    iptables and firewalld are not reliable
    
    Can you give examples of that?
    
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    GreenKnight23@lemmy.world ⁨6⁩ ⁨days⁩ ago
    
    anyone gaining physical or remote access to the device can set rules. by protecting the entire network with a hardware firewall you mitigate attack vectors from other hardware on your network that become compromised.
    
    iptables and firewalld are notorious for locking users out of the system by overzealous or green system admins. in the msp world this happens practically by the hour.
    
    iptables and firewalld can be used against you in the event of a breach. one of the first things an attacker may attempt is to forward ports and lock system admins out as they take over the system.
    
    make sure you save your rules properly or they’ll be gone after a reboot or botched upgrade
    
    migrating your rules from one system to another when you’re changing hardware or restoring a system is a huge pain in the ass.
    
    got a network change that’s going to modify the subnet your systems are on? get ready to migrate all 15 of your devices one by one for the next 8-15 hours (depending on the complexity of your rules)
    
    it’s far easier, and safer to have all your network config done in the network. from system migrations to securing/hardening. it’s far more efficient and effective to have a single source of truth that manages network routing and firewall rules. hell, you can even have a redundant or load balanced firewall configuration if you’re afraid of a single point of failure.
    
    point is, firewalld and iptables is for amateur hour and hobbyists.
    
    if you want to complain that “docker doesn’t respect system firewalls” then at least have the chutzpah enough to do it the right way from the beginning.
    
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- wasabi@feddit.org ⁨6⁩ ⁨days⁩ ago
  
  What if you rent a bare metal server in a data center?
  
  Install proxmox and use its SDN/FW features?
  
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