{"id":7577,"date":"2016-02-02T11:17:03","date_gmt":"2016-02-02T10:17:03","guid":{"rendered":"https:\/\/www.websupport.sk\/blog\/?p=7577"},"modified":"2025-03-11T21:06:40","modified_gmt":"2025-03-11T20:06:40","slug":"lets-encrypt-ssl-certifikat-zadarmo-pre-kazdeho","status":"publish","type":"post","link":"https:\/\/www.websupport.sk\/blog\/2016\/02\/lets-encrypt-ssl-certifikat-zadarmo-pre-kazdeho\/","title":{"rendered":"Let\u2019s Encrypt: SSL certifik\u00e1t zadarmo pre ka\u017ed\u00e9ho"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\"><b>Doba \u010d\u00edtania:<\/b><\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span><p>Ako mnoh\u00ed viete, pou\u017e\u00edvanie SSL certifik\u00e1tu na svojom webe m\u00e1 viacero v\u00fdhod. Sl\u00fa\u017ei najm\u00e4 na \u0161ifrovanie komunik\u00e1cie medzi zariadeniami va\u0161ich n\u00e1v\u0161tevn\u00edkov a na\u0161imi servermi, aby sa d\u00e1ta klientov nedostali do nespr\u00e1vnych r\u00fak, \u010do je neocenite\u013en\u00e9 najm\u00e4 v pr\u00edpade e-shopov.<\/p>\n<p>Od augusta minul\u00e9ho roka maj\u00fa tie\u017e weby s certifik\u00e1tom <strong><a href=\"https:\/\/googlewebmastercentral.blogspot.sk\/2014\/08\/https-as-ranking-signal.html\" target=\"_blank\">plusov\u00e9 body<\/a><\/strong> pri vyh\u013ead\u00e1van\u00ed cez Google, ktor\u00fd je tvorcom iniciat\u00edvy <strong>\u201cHTTPS Everywhere\u201d<\/strong>. Jej cie\u013eom je, aby na internete aj mimo neho neexistovali komunika\u010dn\u00e9 linky bez \u0161ifrovania. Po <strong><a href=\"https:\/\/www.washingtonpost.com\/world\/national-security\/nsa-infiltrates-links-to-yahoo-google-data-centers-worldwide-snowden-documents-say\/2013\/10\/30\/e51d661e-4166-11e3-8b74-d89d714ca4dd_story.html\" target=\"_blank\">udalostiach z roku 2013<\/a><\/strong> sa pr\u00edsnemu pr\u00edstupu Googlu nemo\u017eno \u010dudova\u0165.<\/p>\n<p>Napokon, <strong>SSL certifik\u00e1t je nutnos\u0165ou pre prehliadanie str\u00e1nok protokolom HTTP\/2<\/strong>, ktor\u00e9ho cie\u013eom je najm\u00e4 r\u00fdchlej\u0161ie na\u010d\u00edtavanie webov. Toto dosahuje r\u00f4znymi technikami &#8211; multiplexovan\u00edm viacer\u00fdch HTTP po\u017eiadaviek v jednom spojen\u00ed, kompresiou HTTP hlavi\u010diek alebo prioritiz\u00e1ciou po\u017eiadaviek. Protokol je podporovan\u00fd v\u0161etk\u00fdmi zn\u00e1mymi prehliada\u010dmi a rozdiel v r\u00fdchlosti na\u010d\u00edtavania <strong><a href=\"http:\/\/www.httpvshttps.com\/\" target=\"_blank\">m\u00f4\u017eete otestova\u0165<\/a><\/strong>\u00a0aj Vy. V na\u0161om prostred\u00ed dosahoval najlep\u0161ie v\u00fdsledky Google Chrome.<\/p>\n<p>A\u017e doned\u00e1vna bol v\u0161ak SSL certifik\u00e1t sk\u00f4r privil\u00e9giom ako samozrejmos\u0165ou, za \u010do mohla najm\u00e4 jeho cena. U n\u00e1s ste si mohli objedna\u0165 SSL pre jednu dom\u00e9nu za 50 eur ro\u010dne bez DPH, no \u0161peci\u00e1lne typy certifik\u00e1tov (ozna\u010dovan\u00e9 ako Platinum alebo Elite) sa m\u00f4\u017eu \u013eahko vy\u0161plha\u0165 cez 250 eur. Situ\u00e1ciu zmenila <strong><a href=\"https:\/\/en.wikipedia.org\/wiki\/Internet_Security_Research_Group\" target=\"_blank\">skupina ISRG<\/a><\/strong>, stojaca za projektom Let\u2019s Encrypt, ktor\u00e9ho poslan\u00edm je naplni\u0165 v\u00edziu \u201cHTTPS Everywhere\u201d. Okrem vyd\u00e1vania bezplatn\u00fdch SSL certifik\u00e1tov je ich snahou \u010do najviac zautomatizova\u0165 proces ich vytv\u00e1rania a odvol\u00e1vania, \u010d\u00edm oslovili sk\u00f4r poskytovate\u013eov hostingu ako koncov\u00fdch majite\u013eov webstr\u00e1nok.<\/p>\n<blockquote class=\"twitter-tweet\" data-lang=\"cs\">\n<p dir=\"ltr\" lang=\"und\">\u010eakujeme, \u017ee sledujete n\u00e1\u0161 nov\u00fd technologick\u00fd kan\u00e1l <a href=\"https:\/\/twitter.com\/websupport_tech\">@websupport_tech<\/a><\/p>\n<p>\u2014 WebSupport Tech (@websupport_tech) <a href=\"https:\/\/twitter.com\/websupport_tech\/status\/727059318235914240\">2. kv\u011btna 2016<\/a><\/p><\/blockquote>\n<p><script src=\"\/\/platform.twitter.com\/widgets.js\" async=\"\" charset=\"utf-8\"><\/script><\/p>\n<p>V\u010faka Let\u2019s Encrypt m\u00f4\u017eete ma\u0165 SSL certifik\u00e1t pre \u013eubovo\u013en\u00fa dom\u00e9nu alebo subdom\u00e9nu \u00faplne zdarma a do nieko\u013ek\u00fdch sek\u00fand. <strong>Certifik\u00e1ty s\u00fa podpisovan\u00e9 uzn\u00e1vanou autoritou<\/strong>, tak\u017ee zobrazia \u201czelen\u00fd z\u00e1mo\u010dek\u201d v 99% pr\u00edpadov. Na rozdiel od spoplatnen\u00fdch certifik\u00e1tov s\u00fa tie od Let\u2019s Encrypt <strong><a href=\"https:\/\/letsencrypt.org\/2015\/11\/09\/why-90-days.html\" target=\"_blank\">platn\u00e9 iba 3 mesiace<\/a><\/strong> (po tejto dobe sa u n\u00e1s certifik\u00e1t automaticky obnov\u00ed) a nie je mo\u017en\u00e9 vystavi\u0165 \u201cwildcard\u201d. To v\u0161ak vo v\u00e4\u010d\u0161ine pr\u00edpadov nie je probl\u00e9m &#8211; jednoducho si m\u00f4\u017eete vyklika\u0165 tie subdom\u00e9ny, na ktor\u00fdch sa HTTPS bude pou\u017e\u00edva\u0165.<\/p>\n<p>Odpor\u00fa\u010dame pozrie\u0165 sa aj na niektor\u00e9 <strong><a href=\"https:\/\/letsencrypt.org\/2015\/11\/09\/why-90-days.html\" target=\"_blank\">zauj\u00edmav\u00e9 \u0161tatistiky<\/a><\/strong> oh\u013eadom vydan\u00fdch certifik\u00e1tov. V dobe p\u00edsania \u010dl\u00e1nku tvorili .sk dom\u00e9ny takmer 2% v\u0161etk\u00fdch vydan\u00fdch certifik\u00e1tov. \ud83d\ude42<\/p>\n<p><a href=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/02\/534860643.jpg\" rel=\"attachment wp-att-7584\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-7584\" src=\"https:\/\/www.websupport.sk\/blogoads\/sites\/2\/2016\/02\/534860643.jpg\" alt=\"letsencrypt\" width=\"1200\" height=\"692\" srcset=\"https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/02\/534860643.jpg 1200w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/02\/534860643-300x173.jpg 300w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/02\/534860643-768x443.jpg 768w, https:\/\/www.websupport.sk\/blog\/app\/uploads\/sites\/2\/2016\/02\/534860643-1024x591.jpg 1024w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><\/p>\n<h2>Pr\u00edprava na zmeny<\/h2>\n<p>Nasadenie podpory Let\u2019s Encrypt nebolo trivi\u00e1lnou \u00falohou. Museli sme vytvori\u0165 \u0161k\u00e1lovate\u013en\u00fd a spo\u013eahliv\u00fd n\u00e1stroj, ktor\u00fd sa star\u00e1 o automatizovanie cel\u00e9ho procesu od po\u017eiadavky na vydanie certifik\u00e1tu a\u017e po jeho nasadenie na webserver. <strong>Do nieko\u013ek\u00fdch t\u00fd\u017ed\u0148ov od za\u010diatku beta-testov bude t\u00e1to mo\u017enos\u0165 pr\u00edstupn\u00e1 ka\u017ed\u00e9mu klientovi.<\/strong><\/p>\n<p>\u010eal\u0161ou v\u00fdzvou, na ktor\u00fa upozornil jeden zo senior adminov, boli syst\u00e9mov\u00e9 po\u017eiadavky tak\u00e9hoto rie\u0161enia. Na \u010dele na\u0161ej infra\u0161trukt\u00fary toti\u017e stoja loadbalancery, ktor\u00e9 musia by\u0165 zo svojej defin\u00edcie bezstavov\u00e9 &#8211; ak po\u0161lete rovnak\u00fa po\u017eiadavku na ktor\u00fdko\u013evek z nich, mus\u00edte dosta\u0165 rovnak\u00fa odpove\u010f. Z toho d\u00f4vodu musia by\u0165 na ka\u017edom z nich dostupn\u00e9 v\u0161etky SSL certifik\u00e1ty v\u0161etk\u00fdch dom\u00e9n.<\/p>\n<p>V r\u00e1doch stoviek a\u017e jednotiek tis\u00edcov certifik\u00e1tov je situ\u00e1cia udr\u017eate\u013en\u00e1, aj ke\u010f nie ve\u013emi pr\u00edjemn\u00e1 &#8211; procesy webservera (v na\u0161om pr\u00edpade Nginx) be\u017ene zaberali okolo 900 MB RAM kv\u00f4li takmer 2000 certifik\u00e1tom. Tie si webserver na\u010d\u00edtal zo s\u00faborov pri ka\u017edom \u0161tarte, ktor\u00fd z tohto d\u00f4vodu trval nieko\u013eko sek\u00fand. \u010co sa v\u0161ak stane, ak bude certifik\u00e1tov omnoho viac? Ak by len desatina v\u0161etk\u00fdch dom\u00e9n a subdom\u00e9n za\u010dala pou\u017e\u00edva\u0165 SSL certifik\u00e1t, ich po\u010det by presiahol 30 000. Rad\u0161ej ani nechceme vedie\u0165, ak\u00fd vplyv by t\u00e1to situ\u00e1cia mala na loadbalancery. \ud83d\ude42<\/p>\n<p>Pustili sme sa teda do pr\u00e1ce na k\u00f3de, ktor\u00fd by dynamicky na\u010d\u00edtaval SSL certifik\u00e1ty do pam\u00e4te Nginx-u a\u017e pri prvej n\u00e1v\u0161teve str\u00e1nky. Samozrejme, ani prv\u00fd pr\u00edstup k certifik\u00e1tu nesmie trva\u0165 dlho, preto s\u00fa ulo\u017een\u00e9 v lok\u00e1lnej in\u0161tancii Redisu. Pozorn\u00fd \u010ditate\u013e m\u00f4\u017ee namietnu\u0165, \u017ee certifik\u00e1ty s\u00fa takto predsa st\u00e1le v RAM &#8211; \u010do je pravda, av\u0161ak \u201chol\u00fd\u201d certifik\u00e1t zaberie cca 100x menej miesta, ako ke\u010f je akt\u00edvne na\u010d\u00edtan\u00fd v \u0161trukt\u00fare webservera. Pam\u00e4\u0165 pou\u017eit\u00e1 webserverom sa teraz udr\u017eiava do 100 MB a jeho \u0161tart je takmer okam\u017eit\u00fd.<\/p>\n<p>K\u00f3d je nap\u00edsan\u00fd v jazyku <a href=\"http:\/\/www.lua.org\/start.html\" target=\"_blank\">Lua<\/a>, ktor\u00fd je v\u010faka \u00fa\u017easnej snahe viacer\u00fdch developerov mo\u017en\u00e9 pou\u017e\u00edva\u0165 priamo v konfigura\u010dn\u00fdch s\u00faboroch Nginx-u. Mo\u017enos\u0165 programatick\u00e9ho na\u010d\u00edtavania SSL certifik\u00e1tov poch\u00e1dza z dielne <strong>Cloudflare<\/strong>, spolo\u010dnosti prev\u00e1dzkuj\u00facej CDN slu\u017eby.<\/p>\n<p>V\u010faka t\u00fdmto zmen\u00e1m sme nemuseli nijak ovplyv\u0148ova\u0165 fyzick\u00fa str\u00e1nku infra\u0161trukt\u00fary. Naopak, v\u00fdsledky s\u00fa ve\u013emi priazniv\u00e9 &#8211; sme pripraven\u00ed poskytova\u0165 SSL certifik\u00e1ty pre mili\u00f3ny dom\u00e9n a subdom\u00e9n. \u010eal\u0161\u00edm bonusom nov\u00e9ho sp\u00f4sobu na\u010d\u00edtavania SSL certifik\u00e1tov je mo\u017enos\u0165 pou\u017e\u00edva\u0165 vlastn\u00fd certifik\u00e1t aj na webmail a webftp podstr\u00e1nkach (mail.domena.sk, webmail.domena.sk).<\/p>\n<p>Ver\u00edme, \u017ee vyu\u017eijete mo\u017enos\u0165 zabezpe\u010denia zdarma a certifik\u00e1t si vytvor\u00edte hne\u010f, ako to bude mo\u017en\u00e9. \u00a0Let\u2019s Encrypt je v\u0161ak e\u0161te st\u00e1le v beta verzii, preto platen\u00e9 SSL certifik\u00e1ty poskytuj\u00fa st\u00e1le v\u00e4\u010d\u0161ie z\u00e1ruky \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ako mnoh\u00ed viete, pou\u017e\u00edvanie SSL certifik\u00e1tu na svojom webe m\u00e1 viacero v\u00fdhod. Sl\u00fa\u017ei najm\u00e4 na \u0161ifrovanie komunik\u00e1cie medzi zariadeniami va\u0161ich n\u00e1v\u0161tevn\u00edkov a na\u0161imi servermi, aby sa d\u00e1ta klientov nedostali do nespr\u00e1vnych r\u00fak, \u010do je neocenite\u013en\u00e9 najm\u00e4 v pr\u00edpade e-shopov. Od augusta minul\u00e9ho roka maj\u00fa tie\u017e weby s certifik\u00e1tom plusov\u00e9 body pri vyh\u013ead\u00e1van\u00ed cez Google, ktor\u00fd [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":7578,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,7],"tags":[101,103,456,531,797,819,956,961,979,981],"class_list":["post-7577","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novinky","category-technologie","tag-bezpecna-stranka","tag-bezpecnost","tag-lets-enrcypt","tag-najbezpecnejsie","tag-ssl","tag-stranka","tag-websupport","tag-weby","tag-zabezpecenie","tag-zadarmo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Let\u2019s Encrypt: SSL certifik\u00e1t zadarmo pre ka\u017ed\u00e9ho - Websupport blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.sk\/blog\/2016\/02\/lets-encrypt-ssl-certifikat-zadarmo-pre-kazdeho\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Let\u2019s Encrypt: SSL certifik\u00e1t zadarmo pre ka\u017ed\u00e9ho - Websupport blog\" \/>\n<meta property=\"og:description\" content=\"Ako mnoh\u00ed viete, pou\u017e\u00edvanie SSL certifik\u00e1tu na svojom webe m\u00e1 viacero v\u00fdhod. 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