{"id":92230,"date":"2020-08-24T19:42:19","date_gmt":"2020-08-24T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pochti-polovina-trafika-na-kornevye-dns-servery-vyzvana-aktivnostyu-chromium"},"modified":"2020-08-24T19:42:19","modified_gmt":"2020-08-24T17:42:19","slug":"pochti-polovina-trafika-na-kornevye-dns-servery-vyzvana-aktivnostyu-chromium","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/pochti-polovina-trafika-na-kornevye-dns-servery-vyzvana-aktivnostyu-chromium","title":{"rendered":"T\u00e9m\u011b\u0159 polovina provozu na hlavn\u00edch DNS serverech je zp\u016fsobena aktivitou Chromia.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Registr\u00e1tor APNIC, odpov\u011bdn\u00fd za distribuci IP adres v regionu Asie a Tichomo\u0159\u00ed, vydal<\/a><\/noindex> v\u00fdsledky anal\u00fdzy distribuce provozu na jednom z ko\u0159enov\u00fdch DNS server\u016f a.root-servers.net. 45,80 % po\u017eadavk\u016f na ko\u0159enov\u00fd server bylo spojeno s kontrolami prov\u00e1d\u011bn\u00fdmi webov\u00fdmi prohl\u00ed\u017ee\u010di zalo\u017een\u00fdmi na enginu Chromium. T\u00e9m\u011b\u0159 polovina zdroj\u016f ko\u0159enov\u00fdch DNS server\u016f tedy odch\u00e1z\u00ed na prov\u00e1d\u011bn\u00ed diagnostick\u00fdch kontrol Chromium, nikoli na zpracov\u00e1n\u00ed po\u017eadavk\u016f od DNS server\u016f p\u0159i ur\u010dov\u00e1n\u00ed ko\u0159enov\u00fdch z\u00f3n. Vzhledem k tomu, \u017ee Chrome m\u00e1 70% pod\u00edl na trhu webov\u00fdch prohl\u00ed\u017ee\u010d\u016f, takov\u00e1 diagnostick\u00e1 aktivita vede k odesl\u00e1n\u00ed p\u0159ibli\u017en\u011b 60 miliard po\u017eadavk\u016f na ko\u0159enov\u00e9 servery denn\u011b.<\/p>\n

Diagnostick\u00e9 kontroly se v Chromiu pou\u017e\u00edvaj\u00ed k ur\u010den\u00ed, zda poskytovatel\u00e9 slu\u017eeb p\u0159esm\u011brov\u00e1vaj\u00ed po\u017eadavky na neexistuj\u00edc\u00ed n\u00e1zvy na sv\u00e9 zpracovatele. Takov\u00e9 syst\u00e9my zav\u00e1d\u011bj\u00ed n\u011bkte\u0159\u00ed poskytovatel\u00e9, aby si p\u0159esm\u011brov\u00e1vali provoz na dom\u00e9nov\u00e9 n\u00e1zvy zadan\u00e9 s chybou \u2014 obvykle se na neexistuj\u00edc\u00edch domech zobrazuj\u00ed str\u00e1nky s upozorn\u011bn\u00edm na chybu, nab\u00eddkou seznamu pravd\u011bpodobn\u011b spr\u00e1vn\u00fdch n\u00e1zv\u016f a reklamou. Tento typ aktivity zcela naru\u0161uje logiku ur\u010dov\u00e1n\u00ed intranetov\u00fdch hostitel\u016f v prohl\u00ed\u017ee\u010di.<\/p>\n

P\u0159i zpracov\u00e1n\u00ed vyhled\u00e1vac\u00edho dotazu zadan\u00e9ho do adresn\u00edho \u0159\u00e1dku, pokud je zad\u00e1no pouze jedno slovo bez te\u010dek, se prohl\u00ed\u017ee\u010d nejprve sna\u017e\u00ed<\/a><\/noindex> ur\u010dit toto slovo v DNS, p\u0159i\u010dem\u017e se p\u0159edpokl\u00e1d\u00e1, \u017ee se u\u017eivatel m\u016f\u017ee sna\u017eit p\u0159istoupit na intranetovou str\u00e1nku ve vnit\u0159n\u00ed s\u00edti, a neodes\u00edl\u00e1 po\u017eadavek vyhled\u00e1va\u010di. Pokud poskytovatel p\u0159esm\u011brov\u00e1v\u00e1 po\u017eadavky na neexistuj\u00edc\u00ed dom\u00e9nov\u00e9 n\u00e1zvy, u\u017eivatel\u00e9 se setk\u00e1vaj\u00ed s probl\u00e9mem \u2014 jak\u00e9koli jedno-slabi\u010dn\u00e9 vyhled\u00e1vac\u00ed dotazy zadan\u00e9 do adresn\u00edho \u0159\u00e1dku za\u010d\u00ednaj\u00ed b\u00fdt p\u0159esm\u011brov\u00e1ny na str\u00e1nky poskytovatele, a ne na vyhled\u00e1va\u010d.<\/p>\n

Aby v\u00fdvoj\u00e1\u0159i Chromia vy\u0159e\u0161ili vznikl\u00fd probl\u00e9m, p\u0159idali do prohl\u00ed\u017ee\u010de dal\u0161\u00ed kontroly<\/a><\/noindex>, kter\u00e9 p\u0159i identifikaci p\u0159esm\u011brov\u00e1n\u00ed m\u011bn\u00ed logiku zpracov\u00e1n\u00ed po\u017eadavk\u016f v adresn\u00edm \u0159\u00e1dku.
\nP\u0159i ka\u017ed\u00e9m spu\u0161t\u011bn\u00ed, zm\u011bn\u011b nastaven\u00ed DNS nebo zm\u011bn\u011b IP adresy prohl\u00ed\u017ee\u010d pos\u00edl\u00e1 t\u0159i DNS dotazy s n\u00e1hodn\u00fdmi jm\u00e9ny dom\u00e9n prvn\u00ed \u00farovn\u011b, kter\u00e9 s vysokou pravd\u011bpodobnost\u00ed neexistuj\u00ed. Jm\u00e9na obsahuj\u00ed od 7 do 15 latinsk\u00fdch p\u00edsmen (bez te\u010dek) a slou\u017e\u00ed k odhalen\u00ed p\u0159esm\u011brov\u00e1n\u00ed neexistuj\u00edc\u00edch dom\u00e9nov\u00fdch jmen poskytovatelem na jeho host. Pokud p\u0159i zpracov\u00e1n\u00ed t\u0159\u00ed HTTP dotaz\u016f s n\u00e1hodn\u00fdmi jm\u00e9ny budou pro dv\u011b z nich z\u00edsk\u00e1ny p\u0159esm\u011brov\u00e1n\u00ed na stejnou str\u00e1nku, Chromium pova\u017euje, \u017ee u\u017eivatel byl p\u0159esm\u011brov\u00e1n na extern\u00ed str\u00e1nku.<\/p>\n

Jako znaky pro vyhodnocen\u00ed aktivity Chromium z celkov\u00e9ho toku dotaz\u016f na ko\u0159enov\u00e9m DNS serveru byly pou\u017eity netypick\u00e9 velikosti dom\u00e9ny prvn\u00ed \u00farovn\u011b (od 7 do 15 p\u00edsmen) a faktor opakovatelnosti dotaz\u016f (jm\u00e9na byla v\u017edy generov\u00e1na n\u00e1hodn\u011b a neopakovala se).
\nV logu byly nejprve filtrov\u00e1ny dotazy neexistuj\u00edc\u00edch dom\u00e9n (78,09 %), pot\u00e9 byly vybr\u00e1ny dotazy, kter\u00e9 se opakovaly maxim\u00e1ln\u011b t\u0159ikr\u00e1t (51,41 %), a nakonec byly filtrov\u00e1ny dom\u00e9ny, kter\u00e9 obsahovaly od 7 do 15 p\u00edsmen (45,80 %). Zaj\u00edmav\u00e9 je, \u017ee pouze 21,91 % dotaz\u016f na ko\u0159enov\u00e9 servery bylo spojeno s ur\u010den\u00edm existuj\u00edc\u00edch dom\u00e9n.<\/p>\n

\"T\u00e9m\u011b\u0159<\/a><\/noindex><\/center><\/p>\n

V r\u00e1mci v\u00fdzkumu byla tak\u00e9 zkoum\u00e1na z\u00e1vislost n\u00e1r\u016fstu zat\u00ed\u017een\u00ed na ko\u0159enov\u00fdch serverech a.root-servers.net a j.root-servers.net od n\u00e1r\u016fstu popularity Chrome.<\/p>\n

\"T\u00e9m\u011b\u0159<\/a><\/noindex><\/center><\/p>\n

Ve Firefoxu se kontroly p\u0159esm\u011brov\u00e1n\u00ed p\u0159es DNS omezuj\u00ed<\/a><\/noindex> ur\u010den\u00edm p\u0159esm\u011brov\u00e1n\u00ed na autentiza\u010dn\u00ed str\u00e1nky (captive portal) a je realizov\u00e1n<\/a><\/noindex> s pou\u017e\u00edv\u00e1n\u00edm<\/a><\/noindex> pevn\u00e9ho subdom\u00e9ny \u201edetectportal.firefox.com\u201c, bez dotazu na dom\u00e9nov\u00e9 n\u00e1zvy prvn\u00ed \u00farovn\u011b. Toto chov\u00e1n\u00ed nezat\u011b\u017euje ko\u0159enov\u00e9 DNS servery, ale potenci\u00e1ln\u011b m\u016f\u017ee b\u00fdt pova\u017eov\u00e1no<\/a><\/noindex> jak uniknut\u00ed citliv\u00fdch \u00fadaj\u016f o IP adrese u\u017eivatele (p\u0159i ka\u017ed\u00e9m spu\u0161t\u011bn\u00ed je po\u017eadov\u00e1na str\u00e1nka \u201edetectportal.firefox.com\/success.txt\u201c). Pro deaktivaci kontroly ve Firefoxu existuje nastaven\u00ed \u201enetwork.captive-portal-service.enabled\u201c, kter\u00e9 lze zm\u011bnit na str\u00e1nce \u201eabout:config\u201c.<\/p>\n

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

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

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\u043a\u043e\u0440\u043d\u0435\u0432\u043e\u043c\u0443 \u0441\u0435\u0440\u0432\u0435\u0440\u0443 \u043e\u043a\u0430\u0437\u0430\u043b\u0438\u0441\u044c \u0441\u0432\u044f\u0437\u0430\u043d\u044b \u0441 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430\u043c\u0438, \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u043c\u0438 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430\u043c\u0438 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0434\u0432\u0438\u0436\u043a\u0430 Chromium. \u0422\u0430\u043a\u0438\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c, \u043f\u043e\u0447\u0442\u0438 \u043f\u043e\u043b\u043e\u0432\u0438\u043d\u0430 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u043a\u043e\u0440\u043d\u0435\u0432\u044b\u0445 DNS-\u0441\u0435\u0440\u0432\u0435\u0440\u043e\u0432 \u0443\u0445\u043e\u0434\u0438\u0442 \u043d\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 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