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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Power User’ Category

Using Google/Cloudflare/central DNS can bite you with large downloads

Posted by jpluimers on 2021/10/22

If you think download speeds are slow for large downloads (or multi-media playback is slow or quality is low) on a fast link, then consider your DNS.

Many people report that using one of the centralised DNS services (like Google/Cloudflare/…) causes slowness because they direct CDN lookups to a small pool of servers that get overloaded.

Some links:

Via [WayBack] How to check whether DNS is working through a browser? – Super User

Google DNS also allows for interactive querying, for example [WayBack] Google Public DNS

Result for atlassian-domain-for-localhost-connections-only.com/A with DNSSEC validation:

{
  "Status": 0,
  "TC": false,
  "RD": true,
  "RA": true,
  "AD": false,
  "CD": false,
  "Question": [
    {
      "name": "atlassian-domain-for-localhost-connections-only.com.",
      "type": 1
    }
  ],
  "Answer": [
    {
      "name": "atlassian-domain-for-localhost-connections-only.com.",
      "type": 1,
      "TTL": 1620,
      "data": "127.0.0.1"
    }
  ]
}

–jeroen

Posted in DNS, Internet, Network-and-equipment, Power User | Leave a Comment »

Legality of Dutch non-reanimation statements

Posted by jpluimers on 2021/10/22

For my link archive:

The above are legally binding, but not all medical personnel knows them  by heart.

The legal document is the hardest for the medics to find, so way easier are the badges or tattoos.

Via [WayBack] Sander de Hosson on Twitter: “Zie deze tattoo best wel vaak. Is dit rechtsgeldig, @Gert_van_Dijk? #dtv… “

–jeroen

Read the rest of this entry »

Posted in About, Personal, Power User, LifeHacker | Leave a Comment »

HTML cleanup tool & simplifier. For basic & clean HTML 🔧

Posted by jpluimers on 2021/10/21

I have used other on-line HTML cleanup tools in the past (especially for including parts of web-pages in a blog post), but so far none beats HTML Washer: [Wayback] HTML cleanup tool & simplifier. For basic & clean HTML 🔧

An online tool that reduces HTML to basic tags and attributes. Removes scripts, CSS, and other non-basic elements like , , etc… Also, corrects errors and formats the HTML doc or a fragment.

–jeroen

Posted in Development, HTML, Power User, SocialMedia, Software Development, Web Development, WordPress | Leave a Comment »

Filippo Valsorda on Twitter: “whoami.filippo.io , the SSH server that knows who you are … Try it out! $ ssh http://whoami.filippo.io”

Posted by jpluimers on 2021/10/20

[Archive.is] Filippo Valsorda on Twitter: “whoami.filippo.io , the SSH server that knows who you are, got some newly refreshed intel! Try it out! $ ssh whoami.filippo.io

The server itself has some HTML with information too whoami.filippo.io redirecting to [WayBack] ssh whoami.filippo.io (source code is at [WayBack] GitHub – FiloSottile/whoami.filippo.io: A ssh server that knows who you are. $ ssh whoami.filippo.io).

It’s a cool open source server written in Golang, that gets all your public ssh keys (ssh automatically transmits those) and tries to map them back to a GitHub account.

In addition it shows you some potential vulnerabilities of your ssh client.

Note that in October 2020, it was temporarily down, but it will be up again: [Archive.is] Filippo Valsorda 💉💉 on Twitter: “Yeah I’m planning to but I can’t give you an ETA I’m afraid. A few weeks, maybe?… “

Thread comments

Some interesting comments in the thread:

Related: [WayBack] Auditing GitHub users’ SSH key quality

Stop presenting public keys

[WayBack] GitHub – FiloSottile/whoami.filippo.io: A ssh server that knows who you are. $ ssh whoami.filippo.io: How do I stop passing public keys

How do I stop it?

If this behavior is problematic for you, you can tell ssh not to present your public keys to the server by default.

Add these lines at the end of your ~/.ssh/config (after other “Host” directives)

Host *
    PubkeyAuthentication no
    IdentitiesOnly yes

And then specify what keys should be used for each host

Host example.com
    PubkeyAuthentication yes
    IdentityFile ~/.ssh/id_rsa
    # IdentitiesOnly yes # Enable ssh-agent (PKCS11 etc.) keys

If you want you can use different keys so that they can’t be linked together

Host github.com
    PubkeyAuthentication yes
    IdentityFile ~/.ssh/github_id_rsa

–jeroen

Read the rest of this entry »

Posted in *nix, *nix-tools, Communications Development, Development, Go (golang), Internet protocol suite, Power User, Software Development, SSH, ssh/sshd, TCP | Leave a Comment »

The hard part of a crypto specification: make it safe and misuse resistant.

Posted by jpluimers on 2021/10/19

Great quote from a while back:

[WayBack] Filippo Valsorda on Twitter: “Here’s a secret: it’s not that hard to put together a crypto specification. What’s hard is to make it safe and misuse resistant. What needs to be “battle tested” is the security devex, not the narrow happy path, and blaming the developer when it breaks is not battle testing.”

From the same thread:

–jeroen

Read the rest of this entry »

Posted in Development, Power User, Security, Software Development | Leave a Comment »

 
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