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how to prevent DDoS attacks ?

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  • crazycellsundefined

    CSS codes to prevent votes to disappear

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    crazycellsundefined
    @phenomlab yes, it is thanks a lot…
  • crazycellsundefined

    Bug Report

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    phenomlabundefined
    @crazycells Good points, thanks. I completely forgot that classes are added - makes life much simpler! EDIT - seems this is pretty straightforward, and only needs the below CSS .upvoted i { color: var(--bs-user-level) !important; } This then yields [image: 1718028529465-3f072f8a-ebfa-4910-8723-73c493b8e4eb-image.png] However, the caveat here is that the .upvoted class will only show for your upvotes, and nobody else’s. However, this does satisfy the original request however I would love to see my upvoted posts more clearly, because currently, when I upvote, nothing on the post tool is changing, it would be nicer if there is an indication that I have upvoted (like a filled or colored triangle?)
  • DownPWundefined

    Setting for high load and prevent DDoS (sysctl, iptables, crowdsec or other)

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    phenomlabundefined
    @DownPW most of this really depends on your desired security model. In all cases with firewalls, less is always more, although it’s never as clear cut as that, and there are always bespoke ports you’ll need to open periodically. Heztner’s DDoS protection is superior, and I know they have invested a lot of time, effort, and money into making it extremely effective. However, if you consider that the largest ever DDoS attack hit Cloudflare at 71m rps (and they were able to deflect it), and each attack can last anywhere between 8-24 hours which really depends on how determined the attacker(s) is/are, you can never be fully prepared - nor can you trace it’s true origin. DDoS attacks by their nature (Distributed Denial of Service) are conducted by large numbers of devices whom have become part of a “bot army” - and in most cases, the owners of these devices are blissfully unaware that they have been attacked and are under command and control from a nefarious resource. Given that the attacks originate from multiple sources, this allows the real attacker to observe from a distance whilst concealing their own identity and origin in the process. If you consider the desired effect of DDoS, it is not an attempt to access ports that are typically closed, but to flood (and eventually overwhelm) the target (such as a website) with millions of requests per second in an attempt to force it offline. Victims of DDoS attacks are often financial services for example, with either extortion or financial gain being the primary objective - in other words, pay for the originator to stop the attack. It’s even possible to get DDoS as a service these days - with a credit card, a few clicks of a mouse and a target IP, you can have your own proxy campaign running in minutes which typically involves “booters” or “stressers” - see below for more https://heimdalsecurity.com/blog/ddos-as-a-service-attacks-what-are-they-and-how-do-they-work @DownPW said in Setting for high load and prevent DDoS (sysctl, iptables, crowdsec or other): in short if you have any advice to give to secure the best. It’s not just about DDos or firewalls. There are a number of vulnerabilities on all systems that if not patched, will expose that same system to exploit. One of my favourite online testers which does a lot more than most basic ones is below https://www.immuniweb.com/websec/ I’d start with the findings reported here and use that to branch outwards.
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    @Panda said in Smart Widgets: So why is that, or conversely why would the function to expose username ever be required, as it seems app.user is already an available global object? It is, yes, but not if you are using it outside of a widget. The function I wrote is also historical and comes from the 2.x train
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    phenomlabundefined
    @DownPW sure. Let me have a look at this in more detail. I know nginx plus has extensive support for this, but it’s not impossible to get somewhere near acceptable with the standard version. You might be better off handling this at the Cloudflare level given that it sits in between the requesting client and your server.
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    phenomlabundefined
    @cagatay You’d target the body tag and use the below line of CSS background: url(/assets/customcss/backgrounds/default/default.png) no-repeat center center fixed; Obviously, you need to change the path to suit where your image is being stored. More info around the background property can be found here https://www.w3schools.com/cssref/css3_pr_background.php
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    phenomlabundefined
    @pobojmoks that’s easily done by modifying the code provided here so that it targets background rather than border In essence, the below should work $(document).ready(function() { $(window).on('action:ajaxify.end', function(data) { $('.recent-card-container').each(function(i) { var dataId = $(this).attr("data-cid"); var color = $('[role="presentation"]', this).css("background-color"); console.log("data-cid " + dataId + " is " + color); $('[data-cid="' + dataId + '"] .recent-card').attr("style", "background-color: " + color); }); }); });
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    @RiekMedia hi. Just following up on this thread (I know it’s old) but was curious to understand if it’s still an issue or not ?