{"id":35532,"date":"2019-10-31T22:04:52","date_gmt":"2019-10-31T19:04:52","guid":{"rendered":"https:\/\/prohoster.info\/blog\/bezopasnye-push-uvedomleniya-ot-teorii-k-praktike\/"},"modified":"2019-10-31T22:04:52","modified_gmt":"2019-10-31T19:04:52","slug":"bezopasnye-push-uvedomleniya-ot-teorii-k-praktike","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/bezopasnye-push-uvedomleniya-ot-teorii-k-praktike","title":{"rendered":"Turvalised push-teavitused: teooriast praktikasse","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Tere, Habr! <\/p>\n<p>T\u00e4na r\u00e4\u00e4gin sellest, millega oleme kolleegidega juba mitu kuud tegelenud: mobiilimessengerite push-teadete v\u00f5imalustega. Nagu juba mainisin, on meie rakenduses p\u00f5hit\u00e4helepanu suunatud turvalisusele. Seet\u00f5ttu uurisime, kas push-teadetel on 'n\u00f5rku kohti' ja kui jah, siis kuidas saame neid neutraliseerida, et lisada see kasulik funktsioon meie teenusesse.<\/p>\n<p>Avaldan meie <noindex><a rel=\"nofollow\" href=\"https:\/\/medium.com\/adamant-im\/push-notifications-friends-or-foes-b118b67ed258?postPublishedType=repub\">artikli t\u00f5lke Mediumist<\/a><\/noindex> m\u00f5ningate lisandustega. Artiklis on kokkuv\u00f5te 'uurimisest' ja jutt sellest, kuidas probleemi lahendasime.<\/p>\n<h2>Uurime materjali<\/h2>\n<p>\nKlassikalises mudelis teevad push-teated messengerid vastuv\u00f5tlikuks MITM (Man-in-the-middle, 'Inimene keskel') r\u00fcnnakutele. N\u00e4iteks Google'il, Microsoftil ja vanas iMessage'i versioonis saadab rakendus \u0161ifreerimisv\u00f5tmed Apple'i serveritesse \u2014 serveris toimub kasutajate autentimine ja s\u00f5numi pealkirja (v\u00f5i selle sisu) de\u0161ifreerimine.<\/p>\n<p><img decoding=\"async\" alt=\"Turvalised push-teavitused: teooriast praktikasse\" src=\"\/wp-content\/uploads\/2019\/06\/5a1d3de5fc9c7d6da3f48490dccd2ab6.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nL\u00f5ppkokkuv\u00f5ttes on v\u00f5imalus lugeda vestlusi, kui p\u00e4\u00e4seb juurde push-teadete serverile. See t\u00e4hendab, et k\u00f5ik vestluste kr\u00fcpteerimine on kasutu: push-teated j\u00e4tavad ikkagi v\u00f5imaluse kolmandate isikute lugemiseks. Autoriartiklis arutleti p\u00f5hjalikumalt nende v\u00f5imaluste \u00fcle. <noindex><a rel=\"nofollow\" href=\"https:\/\/xakep.ru\/2018\/06\/14\/useless-encryption\/\">\u201eKr\u00fcptige \u00f5igesti\u201c<\/a><\/noindex> Xaker.ru-s, mis on p\u00fchendatud s\u00f5numite kr\u00fcptimise meetoditele. <\/p>\n<p>Kui arvate, et Apple'i ja Google'i serverid ei lase kunagi kasutajate kr\u00fcptimisv\u00f5tmete lekkeid, siis m\u00f5elge, et neile p\u00e4\u00e4sevad ligi nende t\u00f6\u00f6tajad. Ja t\u00f6\u00f6tajad \u2014 need on inimesed.<br \/>\nK\u00f5igist push-i haavatavustest hoolimata kasutavad paljud \u201eturvalised\u201c s\u00f5numirakendused, sealhulgas Signal ja Telegram, neid. Ilma nendeta peaksid kasutajad uusi s\u00f5numeid pidevalt rakendusse 'k\u00e4si' kontrollima, mis on v\u00e4ga ebamugav ja konkurentsiv\u00f5imelised s\u00f5numirakendused saavad eelise.<\/p>\n<h2>Paranoia ja ratsionaalne m\u00f5tlemine<\/h2>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nMeie projektis tegelesime sellega l\u00e4hemalt paar kuud tagasi. Me vajasime push-teavituste funktsiooni, et olla konkurentsiv\u00f5imelised. Kuid samal ajal ei tohtinud me turvapisaraid avada, sest iga andmeleke kahjustaks projekti usaldusv\u00e4\u00e4rsust.<\/p>\n<p>Kuid meil on juba oluline eelis: meie s\u00f5numirakendus on detsentraliseeritud (andmed salvestatakse plokiahelas), samas kui t\u00f6\u00f6tajatel puudub juurdep\u00e4\u00e4s kontodele. Kr\u00fcptimisv\u00f5tmed on ainult kasutajatel, ja vestluskaaslaste avalikud v\u00f5tmed on plokiahelas saadaval, et kaitsta MITM-r\u00fcnnakute eest.<\/p>\n<p>Esimeses versioonis otsustasime maksimaalselt ettevaatlik olla ja mitte edastada s\u00f5numi teksti \u00fcldse. Push-teenus sai s\u00f5lmpunktist mitte s\u00f5numi teksti, vaid vaid signaali selle vastuv\u00f5tmise kohta. Seet\u00f5ttu n\u00e4gi kasutaja teadet \u201eSaabunud on uus s\u00f5num\u201d. Selle lugemine oli v\u00f5imalik vaid s\u00f5numitoojast. <\/p>\n<p><img decoding=\"async\" alt=\"Turvalised push-teavitused: teooriast praktikasse\" src=\"\/wp-content\/uploads\/2019\/06\/5f4bf5861141666105cd5c76c27c796c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/www.youtube.com\/watch?time_continue=21&amp;v=WK3gyH7_iAw\">Kuidas see t\u00f6\u00f6tas: video<\/a><\/noindex>.<\/p>\n<p>P\u00e4rast seda saime teada, et Apple'i viimases versioonis on uusi kaitseelemente. Need <noindex><a rel=\"nofollow\" href=\"https:\/\/developer.apple.com\/documentation\/usernotifications\/unnotificationserviceextension\">v\u00e4lja andsid<\/a><\/noindex> UNNotificationServiceExtension, mis v\u00f5imaldab arendajatel saata t\u00e4ielikult kr\u00fcpteeritud teadete andmeid l\u00e4bi APNS. Seej\u00e4rel dekr\u00fcpteerib rakendus l\u00f5ppkasutaja seadmes (v\u00f5i laadib t\u00e4iendavaid andmeid) ja kuvab teadet. Selle v\u00f5tsime aluseks push-\u00fclesannete teise versiooni.<\/p>\n<p>Praegu oleme v\u00e4lja t\u00f6\u00f6tanud teise versiooni push-teadetest iOS-ile, mis v\u00f5imaldab kuvada s\u00f5numi teksti ilma turvariskita. Uue kontseptsiooni loogika n\u00e4eb v\u00e4lja j\u00e4rgmiselt:<\/p>\n<ul>\n<li>Push-teenus saadab push-teate tehingu numbriga (kr\u00fcpteeritud s\u00f5num v\u00f5ib olla v\u00e4ga suur ja teadete suurus on tugevalt piiratud)<\/li>\n<li>Seade, kui see saab teate, aktiveerib meie NotificationServiceExtension'i \u2014 mikro-rakenduse, mis k\u00fcsib s\u00f5lme tehingut id alusel, dekr\u00fcpteerib selle salvestatud parooliga ja edastab s\u00fcsteemile uue teate. Parool on salvestatud turvalisse hoidmesse.<\/li>\n<li>S\u00fcsteem kuvab teate dekr\u00fcpteeritud s\u00f5numi v\u00f5i t\u00f5lke.<\/li>\n<li>Ahnud ei l\u00e4he kuhugi, nagu ka plaintext s\u00f5num. Push-teenusel pole v\u00f5imalust s\u00f5numit dekr\u00fcpteerida. <\/li>\n<\/ul>\n<p>\n<img decoding=\"async\" alt=\"Turvalised push-teavitused: teooriast praktikasse\" src=\"\/wp-content\/uploads\/2019\/06\/9b137036738a742c93e5b97a2f0acea5.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSeda versiooni peeti t\u00f6\u00f6ks ja rakendati viimases iOS-i rakenduse uuenduses.<br \/>\nTehnilist poolt huvitavad saavad vaadata allikat: <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Adamant-im\/adamant-notificationService\/\">github.com\/Adamant-im\/adamant-notificationService<\/a><\/noindex>.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/456902\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440! \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u043e \u0442\u043e\u043c, \u0447\u0435\u043c \u043c\u044b \u0441 \u043a\u043e\u043b\u043b\u0435\u0433\u0430\u043c\u0438 \u0437\u0430\u043d\u044f\u0442\u044b \u0443\u0436\u0435 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043c\u0435\u0441\u044f\u0446\u0435\u0432: \u043e \u043f\u0443\u0448-\u0443\u0432\u0435\u0434\u043e\u043c\u043b\u0435\u043d\u0438\u044f\u0445 \u0434\u043b\u044f \u043c\u043e\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u043c\u0435\u0441\u0441\u0435\u043d\u0434\u0436\u0435\u0440\u043e\u0432. \u041a\u0430\u043a \u044f \u0443\u0436\u0435 \u0433\u043e\u0432\u043e\u0440\u0438\u043b, \u0432 \u043d\u0430\u0448\u0435\u043c \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0438 \u0433\u043b\u0430\u0432\u043d\u044b\u0439 \u0443\u043f\u043e\u0440 \u0441\u0434\u0435\u043b\u0430\u043d \u043d\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u043c\u044b \u0432\u044b\u044f\u0441\u043d\u044f\u043b\u0438, \u0435\u0441\u0442\u044c \u043b\u0438 \u0443 \u043f\u0443\u0448-\u0443\u0432\u0435\u0434\u043e\u043c\u043b\u0435\u043d\u0438\u0439 \u201c\u0441\u043b\u0430\u0431\u044b\u0435 \u043c\u0435\u0441\u0442\u0430\u201d \u0438 \u0435\u0441\u043b\u0438 \u0434\u0430, \u0442\u043e \u043a\u0430\u043a \u043c\u044b \u043c\u043e\u0436\u0435\u043c \u0438\u0445 \u043d\u0438\u0432\u0435\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c, \u0447\u0442\u043e\u0431\u044b \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u044d\u0442\u0443 \u043f\u043e\u043b\u0435\u0437\u043d\u0443\u044e \u043e\u043f\u0446\u0438\u044e \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26645,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-35532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440! 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T\u00e4na r\u00e4\u00e4gin, millega me kolleegidega juba mitu kuud tegeleme: push-teated mobiilsete s\u00f5numirakenduste jaoks. Nagu ma juba \u00fctlesin, on meie rakenduses peamine r\u00f5hk keskendunud turvalisusele. 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