opensnitch
rustsec
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opensnitch | rustsec | |
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213 | 33 | |
9,633 | 1,518 | |
- | 2.5% | |
9.2 | 9.5 | |
12 days ago | 6 days ago | |
Python | Rust | |
GNU General Public License v3.0 only | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
opensnitch
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eBPF Verification Is Untenable
The whole BPF verifier and development process is so botched, it's ridiculous. It's like maintainers decided to make this as hard as possible out of pettiness and "they have to use C APIs instead" or something.
- Loading an eBPF module without the CAP_BPF (and in some cases without the CAP_NET_ADMIN which you need for XDP) capabilities will generate a "unknown/invalid memory access" error which is super useless as an error message.
- In my personal opinion a bytecode format for both little endian (bpfel) and big endian (bpfeb) machines is kinda unnecessary. I mean, it's a virtual bytecode format for a reason, right!?
- Compiling eBPF via clang to the bpf bytecode format without debug symbols will make every following error message down the line utterly useless. Took me a while to figure out what "unknown scalar" really means. If you forget that "-g" flag you're totally fucked.
- Anything pointer related that eBPF verifier itself doesn't support will lead to "unknown scalar" errors which are actually out of bounds errors most of the time (e.g. have to use if pointer < size(packet) around it), which only happen in the verification process and can only be shown using the bpftool. If you miss them, good luck getting a better error message out of the kernel while loading the module.
- The bpftool maintainer is kind of unfriendly, he's telling you to read a book about the bytecode format if your code doesn't compile and you're asking about examples on how to use pointers inside a BPF codebase because it seems to enforce specific rules in terms of what kind of method (__always_static) are allowed to modify or allocate memory. There's a lot of limitations that are documented _nowhere_ on the internet, and seemingly all developers are supposed to know them by reading the bpftool codebase itself!? Who's the audience for using the bpftool then? Developers of the bpftool itself?
- The BCC tools (bpf compiler collection) are still using examples that can't compile on an up-to-date kernel. [1] If you don't have the old headers, you'll find a lot of issues that show you the specific git hash where the "bpf-helpers.h" file was still inside the kernel codebase.
- The libbpf repo contain also examples that won't compile. Especially the xdp related ones [2]
- There's also an ongoing migration of all projects (?) to xdp-tools, which seems to be redundant in terms of bpf related topics, but also has only a couple examples that somehow work [3]
- Literally the only userspace eBPF generation framework that worked outside a super outdated enterprise linux environment is the cilium ebpf project [4], but only because they're using the old "bpf-helpers.h" file that are meanwhile removed from the kernel itself. [5] They're also incomplete for things like the new "__u128" and "__bpf_helper_methods" syntax which are sometimes missing.
- The only working examples that can also be used for reference on "what's available" in terms of eBPF and kernel userspace APIs is a forked repo of the bootlin project [6] which literally taught me how to use eBPF in practice.
- All other (official?) examples show you how to make a bpf_printk call, but _none_ of them show you how to even interact with bpf maps (whose syntax changed like 5 times over the course of the last years, and 4 of them don't run through the verifier, obviously). They're also somewhat documented in the wiki of the libbpf project, without further explanation on why or what [7]. Without that bootlin repo I still would have no idea other than how to make a print inside a "kretprobe". Anything more advanced is totally undocumented.
- OpenSnitch even has a workflow that copies their own codebase inside the kernel codebase, just to make it compile - because all other ways are too redundant or too broken. Not kidding you. [8]
Note that none of any BPF related projects uses any kind of reliable version scheme, and none of those project uses anything "modern" like conan (or whatever) as a package manager. Because that would have been too easy to use, and too easy on documenting on what breaks when. /s
Overall I have to say, BPF was the worst development experience I ever had. Writing a kernel module is _easier_ than writing a BPF module, because then you have at least reliable tooling. In the BPF world, anything will and can break at any unpredictable moment. If you compare that to the experience of other development environments like say, JVM or even the JS world, where debuggers that interact with JIT compilers are the norm, well ... then you've successfully been transferred back to the PTSD moments of the 90s.
Honestly I don't know how people can use BPF and say "yeah this has been a great experience and I love it" and not realize how broken the tooling is on every damn level.
I totally recommend reading the book [9] and watching the YouTube videos of Liz Rice [10]. They're awesome, and they show you how to tackle some of the problems I mentioned. I think that without her work, BPF would have had zero chance of success.
What's missing in the BPF world is definitely better tooling, better error messages (e.g. "did you forget to do this?" or even "unexpected statement" would be sooooo much better than the current state), and an easier way to debug an eBPF program. Documentation on what's available and what is not is also necessary, because it's impossible to find out right now. If I am not allowed to use pointers or whatever, then say so in the beginning.
[1] https://github.com/iovisor/bcc
[2] https://github.com/libbpf/libbpf
[3] https://github.com/xdp-project/xdp-tools
[4] https://github.com/cilium/ebpf/
[5] https://github.com/cilium/ebpf/tree/master/examples/headers
[6] https://elixir.bootlin.com/linux/latest/source/tools/testing...
[7] https://github.com/libbpf/libbpf/wiki/Libbpf-1.0-migration-g...
[8] https://github.com/evilsocket/opensnitch/blob/master/ebpf_pr...
[9] https://isovalent.com/learning-ebpf/
[10] (e.g.) https://www.youtube.com/watch?v=L3_AOFSNKK8
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PSA: New cross-platform "Fractureiser" Minecraft modpack malware being exploited in the wild
OpenSnitch is a clone of the popular 'LittleSnitch' firewall for Mac. The main feature is that it will tell you about every single connection your computer is doing. A bit annoying for the first few days, but not too bad once you've already allowed the apps you use regularly. I think this would have been the perfect tool for the job.
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Identifying PID generating DNS requests
take a look at opensnitch or picosnitch
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Witch β macOS window switcher replacement
For an Little Snitch alternative on Linux have you tried OpenSnitch? https://github.com/evilsocket/opensnitch
- How to update debian sid to latest kernel? 6.3.3
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OpenSUSE Tumbleweed Security β firewall, fail2ban, apparmor
- utilize firewall, possibly OpenSnitch
- How to block programs like windows firewall does?
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Restrict internet access to all apps except Steam
Following the examples described here https://github.com/evilsocket/opensnitch/wiki/block-lists you could allow Steam when opensnitch prompts you to allow/deny it. Rename the rule to 000-allow-steam and mark [x] Priority rule. Then create another rule to deny connections to any port ([x] To this port: .*)
Opensnitch https://github.com/evilsocket/opensnitch
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Help identifying which process is sending network requests
If you run a GNU/Linux desktop you could also install opensnitch on the server, and the GUI on the desktop (although you'll need to add a rule to redirect traffic from containers).
rustsec
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Rust Tooling: 8 tools that will increase your productivity
cargo-audit is a simple Cargo tool for detecting vulnerable Rust crates. You can install it with cargo install cargo-audit, use cargo audit and youβre done! Any vulnerable crates will appear below, like so:
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Rust Offline?
Further we use cargo-auditable and cargo-audit as part of both our pipeline and regular scanning of all deployed services. This makes our InfoSec and Legal super happy since it means they can also monitor compliance with licenses and patch/update timings.
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Sudo and Su Being Rewritten in Rust for Memory Safety
Yeah your decade old single header libs get so many audits by comparison.
https://github.com/RustSec/rustsec/tree/main/cargo-audit
https://mozilla.github.io/cargo-vet/
cargo is not npm
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A CVE has been issued for hyper. Denial of Service possible
PSA: before filing CVEs for other people's projects, file an issue with https://rustsec.org instead
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Should atomics be unsafe?
Historically, such serious bugs get communicated broadly and addressed very quickly via security advisory blog posts and on https://rustsec.org.
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Rust from a security perspective, where is it vulnerable?
For known vulnerabilities we have the rustsec vulnerability database. You could have a look over there for inspiration. There's also the related cargo-audit for checking dependencies for known vulnerabilities.
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capnproto-rust: out-of-bound memory access bug
Would be cool if this was also reported to https://rustsec.org/ that way cargo audit could pick up and alert the users about it.
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`cargo audit` can now scan compiled binaries
P.S. I also made scanning binaries 5x faster in the latest release of cargo audit.
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My Rust development workflow (after 3+ years)
Thanks to cargo and the community, project maintenance is straightforward in rust. You'll need to install cargo-outdated and cargo-audit:
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Mental models for learning Rust
Use the automated tools to assist you in the maintenance of your projects: rustfmt, clippy, cargo update, cargo outdated and cargo-audit.
What are some alternatives?
portmaster - π Love Freedom - β Block Mass Surveillance
ufw-stats - ufw-stats: Show ufw actions since boot, with ip address information from RIPE database.
flathub - Pull requests for new applications to be added
firejail - Linux namespaces and seccomp-bpf sandbox
ebpfsnitch - Linux Application Level Firewall based on eBPF and NFQUEUE.
picosnitch - Monitor Network Traffic Per Executable, Beautifully Visualized
Pi-hole - A black hole for Internet advertisements
openbsd-wip - OpenBSD work in progress ports
hosts - π Consolidating and extending hosts files from several well-curated sources. Optionally pick extensions for porn, social media, and other categories.
wayland-keylogger - Proof-of-concept Wayland keylogger
rustdesk - An open-source remote desktop, and alternative to TeamViewer.
audacity - Audio Editor