{"id":72754,"date":"2020-03-04T02:42:36","date_gmt":"2020-03-03T23:42:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/massovyj-otzyv-sertifikatov-lets-encrypt"},"modified":"2020-03-04T02:42:36","modified_gmt":"2020-03-03T23:42:36","slug":"massovyj-otzyv-sertifikatov-lets-encrypt","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/massovyj-otzyv-sertifikatov-lets-encrypt","title":{"rendered":"Retragerea masiv\u0103 a certificatelor Let's Encrypt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Certificatul de autoritate nonprofit Let’s Encrypt, controlat de comunitate, ofer\u0103 gratuit certificate tuturor doritorilor. a avertizat<\/a><\/noindex> despre retragerea a numeroase certificate TLS\/SSL emise anterior. Dintre cele 116 milioane de certificate Let's Encrypt \u00een prezent active, vor fi retrase pu\u021bin peste 3 milioane (2,6%), dintre care aproximativ 1 milion sunt duplicate, legate de un singur domeniu (eroarea a afectat \u00een principal certificatele care sunt foarte frecvent actualizate, motiv pentru care sunt at\u00e2t de multe duplicate). Retragerea este planificat\u0103 pentru 4 martie (ora exact\u0103 nu a fost stabilit\u0103 deocamdat\u0103, dar retragerea va avea loc nu mai devreme de ora 3:00 MSK).<\/p>\n

Necesitatea revoc\u0103rii este determinat\u0103 de eroarea identificat\u0103 pe 29 februarie eroare<\/a><\/noindex>. Problema a fost identificat\u0103 \u00eenc\u0103 din 25 iulie 2019 \u0219i afecteaz\u0103 sistemul de verificare a \u00eenregistr\u0103rilor CAA \u00een DNS. \u00cenregistrarea CAA (RFC-6844<\/a><\/noindex>, Certificate Authority Authorization) permite proprietarului domeniului s\u0103 defineasc\u0103 clar autoritatea de certificare prin care pot fi generate certificate pentru domeniul respectiv. Dac\u0103 autoritatea de certificare nu este listat\u0103 \u00een \u00eenregistr\u0103rile CAA, aceasta trebuie s\u0103 blocheze emiterea certificatelor pentru acest domeniu \u0219i s\u0103 informeze proprietarul domeniului despre tentativele de compromitere. \u00cen majoritatea cazurilor, certificatul este solicitat imediat dup\u0103 ce a fost finalizat\u0103 verificarea CAA, dar rezultatul verific\u0103rii este considerat valid timp de \u00eenc\u0103 30 de zile. Regulile stipuleaz\u0103 de asemenea c\u0103 o nou\u0103 verificare trebuie s\u0103 fie efectuat\u0103 cu cel pu\u021bin 8 ore \u00eenainte de emiterea unui nou certificat (adic\u0103 dac\u0103 au trecut 8 ore de la ultima verificare, este necesar\u0103 o nou\u0103 verificare).<\/p>\n

Eroarea se manifest\u0103 dac\u0103 cererea de certificat acoper\u0103 mai multe nume de domenii, pentru fiecare dintre acestea fiind necesar\u0103 verificarea \u00eenregistr\u0103rii CAA. Esen\u021ba erorii const\u0103 \u00een faptul c\u0103, \u00een momentul reapect\u0103rii, \u00een loc de validarea tuturor domeniilor, se efectua o verificare repetat\u0103 doar pentru un singur domeniu din list\u0103 (dac\u0103 \u00een cerere erau N domenii, \u00een loc de N verific\u0103ri diferite, un domeniu era verificat de N ori). Pentru celelalte domenii, verificarea repetat\u0103 nu era efectuat\u0103 \u0219i, \u00een momentul deciziei, erau utilizate datele primei verific\u0103ri (adic\u0103 se foloseau date din ultimele 30 de zile). Ca urmare, \u00een decurs de 30 de zile dup\u0103 prima verificare, Let's Encrypt putea emite un certificat, chiar dac\u0103 valoarea \u00eenregistr\u0103rii CAA fusese modificat\u0103 \u0219i Let's Encrypt fusese eliminat din lista centrilor de certificare accepta\u021bi.<\/p>\n

Utilizatorii afecta\u021bi au primit o notificare prin email, dac\u0103 informa\u021biile de contact au fost completate la ob\u021binerea certificatului. \u00ce\u0219i pot verifica certificatele \u00eenc\u0103rc\u00e2nd list\u0103<\/a><\/noindex> numerele de serie ale certificatelor revocate sau folosind serviciul online<\/a><\/noindex> (g\u0103zduit pe adresa IP, blocat<\/a><\/noindex> de c\u0103tre Roskomnadzor \u00een RF). Se poate afla num\u0103rul de serie al certificatului pentru domeniul dorit folosind comanda:<\/p>\n

openssl s_client -connect example.com:443 -showcerts \/dev\/null \\
\n | openssl x509 -text -noout | grep -A 1 Serial\\ Number | tr -d :<\/p>\n

<\/a><\/noindex><\/p>\n

Sursa: opennet.ro<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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