{"id":104458,"date":"2022-06-21T03:36:39","date_gmt":"2022-06-21T01:36:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/opublikovan-instrumentarij-dlya-opredeleniya-dopolnenij-ustanovlennyh-v-chrome"},"modified":"2022-06-21T03:36:39","modified_gmt":"2022-06-21T01:36:39","slug":"opublikovan-instrumentarij-dlya-opredeleniya-dopolnenij-ustanovlennyh-v-chrome","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/opublikovan-instrumentarij-dlya-opredeleniya-dopolnenij-ustanovlennyh-v-chrome","title":{"rendered":"A fost publicat un instrumentar pentru identificarea extensiilor instalate \u00een Chrome","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A fost publicat un instrument care implementeaz\u0103 metoda de determinare a extensiilor instalate \u00een browserul Chrome. Lista de extensii ob\u021binut\u0103 poate fi folosit\u0103 pentru a cre\u0219te precizia identific\u0103rii pasive a unei instan\u021be specifice a browserului, \u00eempreun\u0103 cu alte semne indirecte, cum ar fi rezolu\u021bia ecranului, caracteristicile WebGL, listele de pluginuri \u0219i fonturi instalate. Implementarea propus\u0103 verific\u0103 instalarea a peste 1000 de extensii. Pentru a verifica sistemul t\u0103u, este disponibil\u0103 o demonstra\u021bie online. <\/p>\n

Determinarea extensiilor se face prin analiza resurselor furnizate de aceste extensii, accesibile pentru solicit\u0103ri externe. \u00cen general, extensiile includ diferite fi\u0219iere adi\u021bionale, cum ar fi imagini, care sunt definite \u00een manifestul extensiei prin proprietatea web_accessible_resources. \u00cen prima versiune a manifestului Chrome, accesul la resurse nu era restric\u021bionat, iar orice site putea s\u0103 \u00eencarce resursele furnizate. \u00cen a doua versiune a manifestului, accesul la astfel de resurse a fost permis \u00een mod implicit doar pentru extensia \u00eens\u0103\u0219i. \u00cen a treia versiune a manifestului, s-a oferit posibilitatea de a determina care resurse pot fi furnizate anumitor extensii, domenii \u0219i pagini. <\/p>\n

Paginile web pot solicita resurse furnizate suplimentar prin metoda fetch (de exemplu, «fetch(‘chrome-extension:\/\/okb….nd5\/test.png’)»), iar returnarea valori «false» indic\u0103 de obicei c\u0103 suplimentul nu este instalat. Pentru a bloca determinarea suplimentului prin prezen\u021ba resurselor, unele suplimente genereaz\u0103 un token de verificare necesar pentru accesarea resursei. Apelul fetch f\u0103r\u0103 specificarea tokenului se \u00eencheie \u00eentotdeauna cu e\u0219ec. <\/p>\n

Se pare c\u0103 protec\u021bia accesului la resursele suplimentelor poate fi ocolit\u0103 evalu\u00e2nd timpul de execu\u021bie al opera\u021biei. De\u0219i fetch returneaz\u0103 \u00eentotdeauna o eroare atunci c\u00e2nd cererea este f\u0103r\u0103 token, timpul de execu\u021bie al opera\u021biei cu \u0219i f\u0103r\u0103 supliment este diferit \u2014 dac\u0103 suplimentul este prezent, cererea va dura mai mult dec\u00e2t dac\u0103 suplimentul nu este instalat. Evalu\u00e2nd timpul de r\u0103spuns, se poate determina destul de precis prezen\u021ba suplimentului. <\/p>\n

Unele suplimente care nu includ resurse accesibile din exterior pot fi identificate prin propriet\u0103\u021bi suplimentare. De exemplu, suplimentul MetaMask poate fi identificat prin evaluarea propriet\u0103\u021bii window.ethereum (dac\u0103 suplimentul nu este instalat, «typeof window.ethereum» va returna valoarea «undefined»).
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-104458","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47A fost publicat un toolkit pentru identificarea extensiilor instalate \u00een Chrome | ProHoster","description":"A fost publicat un toolkit care implementeaz\u0103 metoda de identificare a extensiilor instalate \u00een browserul 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