{"id":101556,"date":"2021-10-06T16:22:48","date_gmt":"2021-10-06T14:22:48","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/stabilnyj-reliz-proksi-servera-squid-5"},"modified":"2021-10-06T16:22:48","modified_gmt":"2021-10-06T14:22:48","slug":"stabilnyj-reliz-proksi-servera-squid-5","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/stabilnyj-reliz-proksi-servera-squid-5","title":{"rendered":"Stabiln\u00ed release proxy serveru Squid 5","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po t\u0159ech letech v\u00fdvoje byl p\u0159edstaven stabiln\u00ed release proxy serveru Squid 5.1, p\u0159ipraven\u00fd k pou\u017eit\u00ed v pracovn\u00edch syst\u00e9mech (verze 5.0.x m\u011bly status beta verz\u00ed). Po p\u0159izn\u00e1n\u00ed v\u011btvi 5.x statusu stabiln\u00ed budou v n\u00ed prov\u00e1d\u011bny pouze opravy zranitelnost\u00ed a stabilitn\u00edch probl\u00e9m\u016f, tak\u00e9 budou povoleny drobn\u00e9 optimalizace. V\u00fdvoj nov\u00fdch funkc\u00ed bude prob\u00edhat v nov\u00e9 experiment\u00e1ln\u00ed v\u011btvi 6.0. U\u017eivatel\u016fm p\u0159edchoz\u00ed stabiln\u00ed v\u011btve 4.x se doporu\u010duje napl\u00e1novat p\u0159echod na v\u011btev 5.x.       <\/p>\n<p>Hlavn\u00ed novinky Squid 5:  <\/p>\n<ul>\n<li class=\"l\"> Do implementace protokolu ICAP (Internet Content Adaptation Protocol), pou\u017e\u00edvaj\u00edc\u00edho se pro integraci s extern\u00edmi syst\u00e9my pro kontrolu obsahu, byla p\u0159id\u00e1na podpora mechanismu p\u0159ipojen\u00ed dat (trailer), kter\u00fd umo\u017e\u0148uje p\u0159ipojit k odpov\u011bdi dal\u0161\u00ed hlavi\u010dky s metadaty um\u00edst\u011bn\u00fdmi po t\u011ble zpr\u00e1vy (nap\u0159\u00edklad lze p\u0159edat kontroln\u00ed sou\u010det a detaily o zji\u0161t\u011bn\u00fdch probl\u00e9mech).\n<li class=\"l\"> P\u0159i p\u0159esm\u011brov\u00e1n\u00ed po\u017eadavk\u016f je pou\u017eit algoritmus \u201eHappy Eyeballs\u201c, kter\u00fd okam\u017eit\u011b vyu\u017e\u00edv\u00e1 z\u00edskanou IP adresu, ani\u017e by \u010dekal na rozli\u0161en\u00ed v\u0161ech potenci\u00e1ln\u011b dostupn\u00fdch c\u00edlov\u00fdch adres IPv4 a IPv6. M\u00edsto zohledn\u011bn\u00ed nastaven\u00ed \u201edns_v4_first\u201c pro ur\u010den\u00ed po\u0159ad\u00ed pou\u017eit\u00ed rodiny adres IPv4 nebo IPv6 se nyn\u00ed bere v \u00favahu po\u0159ad\u00ed odpov\u011bdi v DNS: pokud doraz\u00ed odpov\u011b\u010f DNS AAAA jako prvn\u00ed, bude pou\u017eita z\u00edskan\u00e1 adresa IPv6. D\u00edky tomu se preferovan\u00e1 rodina adres nyn\u00ed nastavuje na \u00farovni firewallu, DNS nebo spu\u0161t\u011bn\u00ed s volbou \u201e--disable-ipv6\u201c. Navrhovan\u00e1 zm\u011bna umo\u017e\u0148uje urychlen\u00ed doby nav\u00e1z\u00e1n\u00ed TCP spojen\u00ed a sn\u00ed\u017een\u00ed vlivu zpo\u017ed\u011bn\u00ed p\u0159i rozli\u0161en\u00ed v DNS. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/lir\/ipv4\/\"   title=\"IP adres\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"692\">IP adres<\/a> Pokud prvn\u00ed doraz\u00ed odpov\u011b\u010f DNS AAAA, bude pou\u017eita z\u00edskan\u00e1 adresa IPv6. T\u00edmto zp\u016fsobem je nyn\u00ed preferovan\u00e1 rodina adres ur\u010dov\u00e1na na \u00farovni firewallu, DNS nebo spu\u0161t\u011bn\u00ed s volbou \u201e--disable-ipv6\u201c. Navrhovan\u00e1 zm\u011bna umo\u017e\u0148uje urychlit \u010das nav\u00e1z\u00e1n\u00ed TCP spojen\u00ed a sn\u00ed\u017eit vliv na v\u00fdkon zpo\u017ed\u011bn\u00ed p\u0159i rozli\u0161en\u00ed v DNS.\n<li class=\"l\"> Pro pou\u017eit\u00ed v direktiv\u011b \u201eexternal_acl\u201c byl p\u0159id\u00e1n zpracovatel \u201eext_kerberos_sid_group_acl\u201c pro autentizaci kontrolou skupin v Active Directory pomoc\u00ed Kerberos. K vy\u017e\u00e1d\u00e1n\u00ed n\u00e1zvu skupiny se pou\u017e\u00edv\u00e1 n\u00e1stroj ldapsearch, kter\u00fd je sou\u010d\u00e1st\u00ed bal\u00ed\u010dku OpenLDAP.\n<li class=\"l\"> Podpora form\u00e1tu datab\u00e1ze Berkeley DB byla prohl\u00e1\u0161ena za zastaralou kv\u016fli licen\u010dn\u00edm probl\u00e9m\u016fm. Verze Berkeley DB 5.x ji\u017e n\u011bkolik let nen\u00ed udr\u017eov\u00e1na a m\u00e1 neopraven\u00e9 zranitelnosti, a p\u0159echod na nov\u011bj\u0161\u00ed vyd\u00e1n\u00ed br\u00e1n\u00ed zm\u011bna licence na AGPLv3, jej\u00ed\u017e po\u017eadavky se vztahuj\u00ed i na aplikace, kter\u00e9 pou\u017e\u00edvaj\u00ed BerkeleyDB ve form\u011b knihovny \u2014 Squid je dod\u00e1v\u00e1n pod licenc\u00ed GPLv2, p\u0159i\u010dem\u017e AGPL nen\u00ed kompatibiln\u00ed s GPLv2. M\u00edsto Berkeley DB byl projekt p\u0159eveden na pou\u017eit\u00ed datab\u00e1zov\u00e9ho syst\u00e9mu TrivialDB, kter\u00fd je na rozd\u00edl od Berkeley DB optimalizov\u00e1n pro sou\u010dasn\u00fd paraleln\u00ed p\u0159\u00edstup k datab\u00e1zi. Podpora Berkeley DB zat\u00edm z\u016fst\u00e1v\u00e1, ale v zpracovatel\u00edch \u201eext_session_acl\u201c a \u201eext_time_quota_acl\u201c se nyn\u00ed doporu\u010duje pou\u017e\u00edvat typ \u00falo\u017ei\u0161t\u011b \u201elibtdb\u201c m\u00edsto \u201elibdb\u201c.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora HTTP hlavi\u010dky CDN-Loop, definovan\u00e9 v RFC 8586, kter\u00e1 umo\u017e\u0148uje odhalit smy\u010dky p\u0159i pou\u017e\u00edv\u00e1n\u00ed s\u00edt\u00ed pro doru\u010dov\u00e1n\u00ed obsahu (hlavi\u010dka poskytuje ochranu p\u0159ed situacemi, kdy se po\u017eadavek b\u011bhem p\u0159esm\u011brov\u00e1n\u00ed mezi CDN z n\u011bjak\u00e9ho d\u016fvodu vrac\u00ed zp\u011bt do p\u016fvodn\u00ed CDN, co\u017e vytv\u00e1\u0159\u00ed nekone\u010dnou smy\u010dku).\n<li class=\"l\"> Do mechanizmu SSL-Bump, kter\u00fd umo\u017e\u0148uje organizaci zachycen\u00ed obsahu \u0161ifrovan\u00fdch HTTPS sezen\u00ed, byla p\u0159id\u00e1na podpora p\u0159esm\u011brov\u00e1n\u00ed pozm\u011bn\u011bn\u00fdch (znovu za\u0161ifrovan\u00fdch) HTTPS po\u017eadavk\u016f p\u0159es jin\u00e9 proxy servery uveden\u00e9 v cache_peer, pomoc\u00ed b\u011b\u017en\u00e9ho tunelu na z\u00e1klad\u011b metody HTTP CONNECT (p\u0159enos p\u0159es HTTPS nen\u00ed podporov\u00e1n, proto\u017ee Squid zat\u00edm nem\u016f\u017ee p\u0159en\u00e1\u0161et TLS uvnit\u0159 TLS). SSL-Bump umo\u017e\u0148uje p\u0159i p\u0159\u00edjmu prvn\u00edho zachycen\u00e9ho po\u017eadavku HTTPS nav\u00e1zat TLS spojen\u00ed s c\u00edlov\u00fdm serverem a z\u00edskat jeho certifik\u00e1t. Pot\u00e9 Squid pou\u017e\u00edv\u00e1 jm\u00e9no hostitele z re\u00e1ln\u011b obdr\u017een\u00e9ho certifik\u00e1tu serveru a vytv\u00e1\u0159\u00ed fiktivn\u00ed certifik\u00e1t, pomoc\u00ed n\u011bj\u017e imituje po\u017eadovan\u00fd server p\u0159i interakci se z\u00e1kazn\u00edkem, p\u0159i\u010dem\u017e nad\u00e1le vyu\u017e\u00edv\u00e1 pro z\u00edsk\u00e1n\u00ed dat TLS spojen\u00ed vytvo\u0159en\u00e9 s c\u00edlov\u00fdm serverem (aby zm\u011bna nezp\u016fsobovala varov\u00e1n\u00ed v prohl\u00ed\u017ee\u010d\u00edch na stran\u011b klienta, je t\u0159eba do \u00falo\u017ei\u0161t\u011b ko\u0159enov\u00fdch certifik\u00e1t\u016f p\u0159idat sv\u016fj certifik\u00e1t pou\u017e\u00edvan\u00fd pro generov\u00e1n\u00ed fiktivn\u00edch certifik\u00e1t\u016f).\n<li class=\"l\"> Byly p\u0159id\u00e1ny direktivy mark_client_connection a mark_client_pack pro p\u0159i\u0159azen\u00ed zna\u010dek Netfilter (CONNMARK) k klientsk\u00fdm TCP p\u0159ipojen\u00edm nebo jednotliv\u00fdm paket\u016fm.      <\/ul>\n<p>N\u00e1sledn\u011b byly zve\u0159ejn\u011bny verze Squid 5.2 a Squid 4.17, kter\u00e9 opravuj\u00ed zranitelnosti:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2021-28116 \u2014 \u00fanik informac\u00ed p\u0159i zpracov\u00e1n\u00ed speci\u00e1ln\u011b form\u00e1tovan\u00fdch zpr\u00e1v WCCPv2. Zranitelnost umo\u017e\u0148uje \u00fato\u010dn\u00edkovi po\u0161kodit seznam zn\u00e1m\u00fdch sm\u011brova\u010d\u016f WCCP a p\u0159esm\u011brovat provoz klient\u016f proxy serveru na sv\u016fj hostitel. Probl\u00e9m se projevuje pouze v konfigurac\u00edch, kde je povolena podpora WCCPv2 a kde je mo\u017en\u00e9 prov\u00e9st spoofing IP adresy sm\u011brova\u010de.\n<li class=\"l\"> CVE-2021-41611 \u2014 chyba p\u0159i ov\u011b\u0159ov\u00e1n\u00ed <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/cs\/ssl-sertifikat\/\"   title=\"TLS certifik\u00e1t\u016f\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"958\">TLS certifik\u00e1t\u016f<\/a>, kter\u00e1 umo\u017e\u0148uje p\u0159\u00edstup s pou\u017eit\u00edm certifik\u00e1t\u016f, kter\u00fdm nelze d\u016fv\u011b\u0159ovat.      <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55929\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 \u0442\u0440\u0451\u0445 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0439 \u0440\u0435\u043b\u0438\u0437 \u043f\u0440\u043e\u043a\u0441\u0438-\u0441\u0435\u0440\u0432\u0435\u0440\u0430 Squid 5.1, \u0433\u043e\u0442\u043e\u0432\u044b\u0439 \u0434\u043b\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u0440\u0430\u0431\u043e\u0447\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 (\u0432\u044b\u043f\u0443\u0441\u043a\u0438 5.0.x \u0438\u043c\u0435\u043b\u0438 \u0441\u0442\u0430\u0442\u0443\u0441 \u0431\u0435\u0442\u0430-\u0432\u0435\u0440\u0441\u0438\u0439). \u041f\u043e\u0441\u043b\u0435 \u043f\u0440\u0438\u0434\u0430\u043d\u0438\u044f \u0432\u0435\u0442\u043a\u0435 5.x \u0441\u0442\u0430\u0442\u0443\u0441\u0430 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0439, \u0432 \u043d\u0435\u0439 \u043e\u0442\u043d\u044b\u043d\u0435 \u0431\u0443\u0434\u0443\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u0442\u043e\u043b\u044c\u043a\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441\u043e \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u044e, \u0442\u0430\u043a\u0436\u0435 \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442\u0441\u044f \u0432\u043d\u0435\u0441\u0435\u043d\u0438\u0435 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0439. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043d\u043e\u0432\u044b\u0445 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0435\u0439 \u0431\u0443\u0434\u0435\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u0432 \u043d\u043e\u0432\u043e\u0439 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0442\u043a\u0435 6.0. \u041f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-101556","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u043e\u0441\u043b\u0435 \u0442\u0440\u0451\u0445 \u043b\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0439 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