{"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\/et\/blog\/news\/massovyj-otzyv-sertifikatov-lets-encrypt","title":{"rendered":"Let's Encrypt sertifikaatide massiline tagasiv\u00f5tt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00dchenduse kontrollitud mittetulunduslik sertifitseerimiskeskus Let's Encrypt, mis pakub tasuta sertifikaate k\u00f5igile soovijatele, hoiatab<\/a><\/noindex> teatab paljude varasemate TLS\/SSL sertifikaatide tagasiv\u00f5tmisest. 116 miljoni aktiivse Let's Encrypt sertifikaadi seast tagasiv\u00f5etakse veidi \u00fcle 3 miljoni (2,6%), millest umbes 1 miljon on \u00fche domeeniga seotud duplikaadid (viga puudutab peamiselt sageli uuendatavaid sertifikaate, seet\u00f5ttu on nii palju duplikaate). Tagasiv\u00f5tt on planeeritud 4. m\u00e4rtsiks (t\u00e4pne aeg pole veel m\u00e4\u00e4ratud, kuid tagasiv\u00f5tt ei toimu enne kella 3 \u00f6\u00f6sel MSK).<\/p>\n

Tagasiv\u00f5tmise vajadus tuleneb 29. veebruaril avastatud veast<\/a><\/noindex>. Probleem ilmnes 25. juulil 2019 ja see m\u00f5jutab DNS-i CAA-kirjete kontrollimise s\u00fcsteemi. CAA-kiri (RFC-6844<\/a><\/noindex>, Certificate Authority Authorization) v\u00f5imaldab domeeni omanikul selgelt m\u00e4\u00e4rata, millise sertifitseerimiskeskuse kaudu v\u00f5ib genereerida sertifikaate m\u00e4\u00e4ratud domeeni jaoks. Kui sertifitseerimiskeskust ei ole CAA-kirjades loetletud, peab see blokeerima sertifikaatide v\u00e4ljastamise antud domeeni jaoks ja teavitama domeeni omanikku kompromiteerimise katsetest. Enamikul juhtudel taotletakse sertifikaati kohe p\u00e4rast CAA-kontrolli l\u00e4bimist, kuid kontrolli tulemus loetakse kehtivaks veel 30 p\u00e4eva. Eeskirjad n\u00f5uavad ka, et korduskontroll viidaks l\u00e4bi hiljemalt 8 tundi enne uue sertifikaadi v\u00e4ljastamist (st kui uue sertifikaadi taotluse ja viimase kontrollimise vahel on m\u00f6\u00f6dunud 8 tundi, on vajalik korduskontroll).<\/p>\n

Viga ilmneb siis, kui sertifikaadi taotlus h\u00f5lmab korraga mitut domeeninime, mille puhul on vajalik CAA-kirje kontroll. Probleem seisneb selles, et korduskontrolli ajal kontrolliti ainult \u00fchte domeeni loendist (kui taotluses oli N domeeni, siis tehti \u00fche domeeni proovimisel N kontrolli). \u00dclej\u00e4\u00e4nud domeenide korduskontrolli ei toimunud ning otsuse tegemisel kasutati esimese kontrolli andmeid (st andmed olid kuni 30 p\u00e4eva vanad). Seet\u00f5ttu v\u00f5is Let's Encrypt anda sertifikaadi kuni 30 p\u00e4eva p\u00e4rast esimest kontrolli, isegi kui CAA-kirje v\u00e4\u00e4rtus oli muutunud ja Let's Encrypt oli eemaldatud lubatud sertifitseerimiskeskuste loendist.<\/p>\n

Probleemiga kasutajatele on saadetud teavitusi e-posti teel, kui sertifikaadi saamisel t\u00e4ideti kontaktandmeid. Oma sertifikaate saab kontrollida, laadides \u00fcles nimekiri<\/a><\/noindex> tagasi kutsutud sertifikaatide seerianumbrid v\u00f5i kasutades veebiteenust<\/a><\/noindex> (mis on asetatud IP-aadressile, mille Venemaa F\u00f6deratsioonis on blokeerinud<\/a><\/noindex> Roskomnadzor). Huvi pakkuva domeeni sertifikaadi seerianumbri m\u00e4\u00e4ramiseks saab kasutada k\u00e4sku:<\/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

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

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