{"id":55599,"date":"2024-03-15T14:42:53","date_gmt":"2024-03-15T14:42:53","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/35659\/Banish-OEM-Self-Signed-Certs-And-Roll-Your-Own-LetsEncrypt.html"},"modified":"2024-03-15T14:42:53","modified_gmt":"2024-03-15T14:42:53","slug":"banish-oem-self-signed-certs-and-roll-your-own-letsencrypt","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/banish-oem-self-signed-certs-and-roll-your-own-letsencrypt\/","title":{"rendered":"Banish OEM Self-Signed Certs And Roll Your Own LetsEncrypt"},"content":{"rendered":"<figure class=\"intro-image intro-left\"> <img decoding=\"async\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/03\/robot-judge-certified-800x450.jpg\" alt=\"Banish OEM self-signed certs forever and roll your own private LetsEncrypt\"><figcaption class=\"caption\">\n<div class=\"caption-credit\">Aurich Lawson | Getty Images<\/div>\n<\/figcaption><\/figure>\n<aside id=\"social-left\" class=\"social-left\" aria-label=\"Read the comments or share this article\"> <a class=\"comment-count icon-comment-bubble-down\" href=\"https:\/\/arstechnica.com\/information-technology\/2024\/03\/banish-oem-self-signed-certs-forever-and-roll-your-own-private-letsencrypt\/?comments=1\"> <\/p>\n<h4 class=\"comment-count-before\">reader comments<\/h4>\n<p> <span class=\"comment-count-number\">89<\/span> <\/a> <\/aside>\n<p> <!-- cache hit 171:single\/related:185107ea96c3f476bef9b65972440180 --><!-- empty --><\/p>\n<p>Previously, on &#8220;Weekend Projects for Homelab Admins With Control Issues,&#8221; we created our own <a href=\"https:\/\/arstechnica.com\/information-technology\/2024\/02\/doing-dns-and-dhcp-for-your-lan-the-old-way-the-way-that-works\/\">dynamically updating DNS and DHCP setup<\/a> with bind and dhcpd. We laughed. We cried. We hurled. Bonds were forged, never to be broken. And I hope we all took a little something special away from the journey\u2014namely, a dynamically updating DNS and DHCP setup. Which we&#8217;re now going to put to use!<\/p>\n<p>If you&#8217;re joining us fresh, without having gone through the previous part and wanting to follow this tutorial, howdy! There might be some parts that are more difficult to complete without a local instance of bind (or other authoritative resolver compatible with <a href=\"https:\/\/en.wikipedia.org\/wiki\/Nsupdate\">nsupdate<\/a>). We&#8217;ll talk more about this when we get there, but just know that if you want to pause and go <a href=\"https:\/\/arstechnica.com\/information-technology\/2024\/02\/doing-dns-and-dhcp-for-your-lan-the-old-way-the-way-that-works\/\">do part one first<\/a>, you may have an easier time following along.<\/p>\n<h2>The quick version: A LetsEncrypt of our own<\/h2>\n<p>This article will walk through the process of installing <a href=\"https:\/\/github.com\/smallstep\/certificates\">step-ca<\/a>, a standalone certificate authority-in-a-box. We&#8217;ll then configure step-ca with an ACME provisioner\u2014that&#8217;s <a href=\"https:\/\/en.wikipedia.org\/wiki\/Automatic_Certificate_Management_Environment\">Automatic Certificate Management Environment<\/a>, the technology that underpins LetsEncrypt and facilitates the automatic provisioning, renewal, and revocation of SSL\/TLS certificates.<\/p>\n<p>After we get step-ca listening for incoming ACME requests, we&#8217;ll talk through the ways to get the self-hosted services on your LAN-speaking ACME so they can start automatically requesting certificates from our step-ca certificate authority\u2014just like how LetsEncrypt works.<\/p>\n<p>I&#8217;ll focus exclusively on using <a href=\"https:\/\/github.com\/acmesh-official\/acme.sh\">acme.sh<\/a> for requesting and renewing certs on clients because it&#8217;s the tool I&#8217;m most familiar with. But everything we do should be doable with any ACME client, so if you&#8217;re more comfy with <a href=\"https:\/\/github.com\/certbot\/certbot\">certbot<\/a> or <a href=\"https:\/\/github.com\/bruncsak\/ght-acme.sh\">dehydrated<\/a> whatever, feel free to use that on your clients. The instructions should be pretty easy to adapt.<\/p>\n<h2>I didn\u2019t understand any of that\u2014we\u2019re doing <em>what<\/em> now?<\/h2>\n<p>So you know how you install a new self-hosted thing on your LAN, and when you log into its web interface, you get a &#8220;your connection isn&#8217;t secure&#8221; warning because the thing you just installed is using a self-signed TLS certificate?<\/p>\n<aside class=\"ad_wrapper\" aria-label=\"In Content advertisement\"> <span class=\"ad_notice\">Advertisement <\/span> <\/aside>\n<figure class=\"image shortcode-img center large\"><a href=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/03\/self-signed-warning.jpg\" class=\"enlarge\" data-height=\"1491\" data-width=\"2560\" alt=\"Warning blindness is a bad thing. This screen has important things to say.\"><img loading=\"lazy\" decoding=\"async\" alt=\"Warning blindness is a bad thing. This screen has important things to say.\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/03\/self-signed-warning.jpg\" width=\"640\" height=\"373\" srcset=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/03\/self-signed-warning.jpg 2x\"><\/a><figcaption class=\"caption\">\n<div class=\"caption-text\"><a href=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2024\/03\/self-signed-warning.jpg\" class=\"enlarge-link\" data-height=\"1491\" data-width=\"2560\">Enlarge<\/a> <span class=\"sep\">\/<\/span> Warning blindness is a bad thing. This screen has important things to say.<\/div>\n<div class=\"caption-credit\">Lee Hutchinson<\/div>\n<\/figcaption><\/figure>\n<p>Those warnings seem spurious, and most people quickly become blind to them, but they serve a very important purpose\u2014even if it&#8217;s a purpose a lot of people don&#8217;t care about.<\/p>\n<p>See, web browsers use TLS and HTTPS to try to accomplish two connected and equally important things: first, and most obviously, to encrypt the connection between you and the web resource you&#8217;re accessing. But the second purpose\u2014the one upended by self-signed certs and the source of the big warnings\u2014is <em>identity verification.<\/em> An assurance that your encrypted communication is going to the person you think it&#8217;s going to is almost as vital as having the communication encrypted in the first place.<\/p>\n<p>A chain of trust extends from the various root <a href=\"https:\/\/en.wikipedia.org\/wiki\/Certificate_authority\">certificate authorities<\/a> down through the TLS certificates they issue to endpoints, and, at least in theory, one should be able to trust that a CA has done some amount of due diligence to verify the identity and ownership of the endpoints it issues certificates to. When you trust a certificate authority, you are trusting that the identity attestations on the certificates that CA issues are in fact accurate\u2014that seeing a cert for &#8220;www.example.com&#8221; really does mean you&#8217;re browsing &#8220;www.example.com&#8221; and not a site pretending to be that (or that your connection isn&#8217;t being compromised via a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Man-in-the-middle_attack\">man-in-the-middle<\/a> type attack).<\/p>\n<p>Self-signed certificates break that chain of trust. Your browser has no way to validate that the resource is what its certificate says it is, because your browser doesn&#8217;t trust the issuer.<\/p>\n<p>This is why browsers show big scary warnings when you visit a page that presents a self-signed cert: You have encryption, but no identity verification. To banish the warnings, we have to have both\u2014which is what we aim to provide with our step-ca installation. We&#8217;re going to set up our own CA and get it trusted by your browser and by the devices and services for which it&#8217;s going to be issuing certificates.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/35659\/Banish-OEM-Self-Signed-Certs-And-Roll-Your-Own-LetsEncrypt.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":55600,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[6624],"class_list":["post-55599","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlineprivacycryptography"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Banish OEM Self-Signed Certs And Roll 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