Self Hosted - Self-hosting your services.

11447 readers

27 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules

No harassment
crossposts from c/Open Source & c/docker & related may be allowed, depending on context
Video Promoting is allowed if is within the topic.
No spamming.
Stay friendly.
Follow the lemmy.ml instance rules.
Tag your post. (Read under)

Important

Beginning of January 1st 2024 this rule WILL be enforced. Posts that are not tagged will be warned and if not fixed within 24h then removed!

Lemmy doesn't have tags yet, so mark it with [Question], [Help], [Project], [Other], [Promoting] or other you may think is appropriate.

Cross-posting

!everything_git@lemmy.ml is allowed!
!docker@lemmy.ml is allowed!
!portainer@lemmy.ml is allowed!
!fediverse@lemmy.ml is allowed if topic has to do with selfhosting.
!selfhosted@lemmy.ml is allowed!

If you see a rule-breaker please DM the mods!

founded 3 years ago

MODERATORS

Zoe8338@lemmy.ml

dogmuffins@lemmy.ml

testman@lemmy.ml

142

PSA: Test Your Server SSH Access (lemmy.ml)

submitted 1 month ago* (last edited 1 month ago) by brownmustardminion@lemmy.ml to c/selfhost@lemmy.ml

12 comments fedilink hide all child comments

I accidentally attempted to SSH into one of my servers from a device that did not contain my ssh key. I configure all of my servers to only allow authentication via cryptographic keys. Root ssh as well as password auth are disabled.

To my surprise, I was able to log in to my server with a password despite this. Baffled, I first tried some other servers. 2 of the 5 other servers I tried were accessabke via password.

After some swift investigation the culprit was found, a cloud-init ssh config in sshd_config.d/ with one line: password_authentication Yes.

So TLDR PSA....if you run a server in any type of virtualized environment, including a VPS, check your /etc/ssh/sshd_config.d/ folder. And more broadly, actually thoroughly test your ssh access to confirm everything is working as you intend it to.

you are viewing a single comment's thread
view the rest of the comments

[–] henfredemars@infosec.pub 19 points 1 month ago* (last edited 1 month ago)

This is good advice in general. Think of it like penetration testing. You really should verify what you can actually access remotely on a device and not assume you have any level of protection until you’ve tried it.

Log files can also contain signs of attack like password guessing. You should review these on a regular basis.