N.E.P.T.R

From the description of this repo:

OpenCal is a web-based open-source software designed to make online appointment scheduling effortless and efficient. Whether you’re managing a team or running a business, OpenCal takes the hassle out of coordinating appointments, eliminating the need for endless back-and-forth emails. With OpenCal, you can streamline communication, save time, and focus on what really matters.

Can you give a description instead of just posting a plain link. Low effort post.

Most include micro iirc

Can you at least credit the OP who originally posted this when reposting? What community did you get this from?

Screensharing is the only thing i dont think it does. Voice and video good. See snikket or conversations.im

Also the repo image

Yes, I understand what GVisor does. Cgroups2 are for isolation of system resources, bit arent even the main sandbox feature used for isolation by Docker. I am pretty sure namespaces significantly more important for these containers’ security.

GVisor helps with one of the main risks in a container setup which is the shared kernel by hosts and guests. I understand it comes with a performance penalty (and I didnt know it was incompatible with SELinux), but that does change my original point that GVisor is a security improvement to default Docker. I understand there is more nuance, even when I wrote my original comment I understood (just like any other security feature) it cant be used in every scenario. I was being intentionally general, and in my second comment I was pretty specific about what it protects against: Kernel vulnerabilities and privilege escalation.

I researched cgroups2 more and I still dont understand why you brought it up in the first place. Cgroups2 and gvisor provide very different security benefits. Cgroups help to keep a system available (lessening the risk DoS attacks) by controlling access to some system resources (io, devices, cpu, memory) and grouping processes of a similar type. It seems rather optimized to solve resource control on a container host. I mentioned gvisor because it is mostly just a drop-in replacement container runtime which doesnt need setup to be used.s

Now for a different container runtime which provides significantly more features (than gvisor) with less downsides (if configured correctly for a specific workload), Sydbox provides syd-oci which id an application kernel runtime which uses a permission config file to create a sandbox, isolating using namespaces, seccomp, landlock, and more. It can sandbox in many different categories (often times leveraging multiple features to provide a multilayer sandbox), you can see the categories at the syd manpage. The biggest downside is that you must really understand what your container application needs otherwise it will prevent it from running. It is a “secure by-default” sandbox which can be softened through config.

I dont really understand what you mean in your last sentence.

My reason for saying GVisor is safer is because it is an application kernel which provides traps and emulates most Linux syscalls in the guest with a far smaller set of syscalls to the host kernel, helping to prevent container escapes and privilege escalation. GVisor also fully drops privileges early into start up (before running any significant logic), helping to prevent privilege escalation.

Cgroups is not a really a security feature (from what I understand). It is about controlling process priority, hierarchy, and resources limiting (among other things). You can not use GVisor with LXC.

The UI is proprietary.

In order of most to least secure

VM > Docker+GVisor > Docker/LXC

Docker+GVisor is good middle ground because it provides the guest container with an application kernel in a memory safe language and reduced syscall attack surface to avoid kernel container escapes. Docker/LXC share the kernel with the host.

Being 2 months late to a quarterly patch is still very bad. /e/OS should be avoided.

The embargo on security patches isnt what i am talking about. Once security patches are released, /e/OS takes 1-2 months to patch these vulnerabilities. This isnt because of the embargo but in addition to it! They are by far the worst about this out of any of the alt Android ROMs (2nd worst is iode, at around ~1 month). /e/OS has been terrible about security for years even before all this “Google security patch” nonsense.

There was drama last year because the (or one?) moderator of fosstodon is a fascist.

Just so people known (or a reminder), Grayjay is NOT open source. FUTO is very sus and the cofounder techbro guy (not rossmann) is a fascist wierdo.

/e/OS is terrible for security. They are often 1-2+ monthly behind on monthly Android security patches, leaving their users vulnerable to dozens (i am not exaggerating, often more) of critical and high severity vulnerabilities which are widely exploited. Stay away from that shit.

On fdroid, it reports these anti-features for Xtra

• Depends on not-libre proxy TTV.lol
• Tracks/reports your activity by leaking your IP and Twitch ID to their Russian proxy TTV.lol

The other problem with Matrix for me is that Element call (the protocol) is not present in most public instances and isn’t very straightforward to selfhost. The default is jitsi which is not E2EE. Pretty major IMO because if Matrix is supposed to be a Discord alternative and supposedly E2EE but VC isnt encrypted, pretty yikes.

Also they have claimed for years that they have forward secrecy. Has something actually changed recently?

Where did you read that Signal uses MLS? I could not find any claims of using MLS on Signal’s specs page or their GitHub repo. Also MLS doesn’t mean anything on its own, see Soatok’s blog on MLS.

Soatok is currently in the process of writing a blog post about another vulneribilty they found in Matrix’s encryption, and with Matrix’s history of numerous vulnerabilities, I would stay away from that shit. No matter how “good” the algorithm is in theory, it is all about implementation. Matrix also has very brittle encryption, often times many messages will become unrecoverable, which is terrible UX.

You’d be better off just selfhosting XMPP+OMEMO, with the caveat that it is also flawed and leaks plenty of metadata.

The best alternatives to Signal (but not Discord) are SimpleX and Briar. Both are significantly better than XMPP/Matrix for privacy and security.

Lol

It still isnt great. Better than DeltaChat/Matrix but decently worse than Signal’s security.