{"id":360,"date":"2023-12-07T03:12:42","date_gmt":"2023-12-07T00:12:42","guid":{"rendered":"https:\/\/sms-txt.net\/?p=360"},"modified":"2024-09-05T12:44:42","modified_gmt":"2024-09-05T09:44:42","slug":"ss7-zachytenie-volania","status":"publish","type":"post","link":"https:\/\/sms-txt.net\/sk\/zachytenie-hovoru\/ss7-zachytenie-volania\/","title":{"rendered":"Odpo\u010d\u00favanie hovorov SS7"},"content":{"rendered":"

Mobiln\u00e1 \u00fastred\u0148a MSC zvy\u010dajne uchov\u00e1va \u0161ifrovacie k\u013e\u00fa\u010de, ktor\u00e9 pou\u017e\u00edva ka\u017ed\u00fd \u00fa\u010dastn\u00edk, aby mohol nadviaza\u0165 hovor. Ke\u010f je \u00fa\u010dastn\u00edk v pohybe, proces odovzdania u\u013eah\u010duje plynul\u00fd prechod \u00fa\u010dastn\u00edka medzi r\u00f4znymi r\u00e1diov\u00fdmi bunkami, pri\u010dom sa zachov\u00e1va priebeh hovoru.<\/p>\n

V niektor\u00fdch pr\u00edpadoch sa \u00fa\u010dastn\u00edk pres\u00fava z jednej bunky do druhej, ktor\u00fa spravuje in\u00fd VLR. V tomto pr\u00edpade nov\u00fd VLR nem\u00e1 na za\u010diatku autentifika\u010dn\u00e9 inform\u00e1cie, ktor\u00e9 by u\u013eah\u010dili zachovanie volania, preto je potrebn\u00fd proces odovzdania medzi MSC na prenos k\u013e\u00fa\u010dov do nov\u00e9ho MSC.<\/p>\n

Toto sa vykon\u00e1va prostredn\u00edctvom spr\u00e1vy MAP s n\u00e1zvom sendIdentification. Nov\u00fd VLR odo\u0161le spr\u00e1vu sendIdentification star\u00e9mu VLR, ktor\u00fd n\u00e1sledne odpovie k\u013e\u00fa\u010dmi potrebn\u00fdmi na udr\u017eanie prebiehaj\u00faceho volania. Medzi tieto k\u013e\u00fa\u010de patr\u00ed aj k\u013e\u00fa\u010d pou\u017e\u00edvan\u00fd na \u0161ifrovanie prev\u00e1dzky vzduchom. V scen\u00e1ri \u00fatoku \u00fato\u010dn\u00edk zachyt\u00e1va prev\u00e1dzku cie\u013ea cez vzdu\u0161n\u00e9 rozhranie (vy\u017eaduje fyzick\u00fa bl\u00edzkos\u0165 cie\u013ea).<\/p>\n

S pr\u00edstupom k SS7 potom m\u00f4\u017ee pomocou spr\u00e1vy sendIdentification z\u00edska\u0165 de\u0161ifrovacie k\u013e\u00fa\u010de pre cie\u013e a pou\u017ei\u0165 ich na de\u0161ifrovanie prev\u00e1dzky. Spr\u00e1va sendIdentification je potrebn\u00e1 len v r\u00e1mci vn\u00fatornej siete po\u010das
\nodovzdanie. Nemala by ma\u0165 \u017eiadne legit\u00edmne pou\u017eitie zvonku, a preto by mala by\u0165 filtrovan\u00e1 na hranici.<\/p>\n

Zachyt\u00e1vanie odch\u00e1dzaj\u00facich hovorov<\/h2>\n

Funkcia riadenia slu\u017eby GSM (gsmSCF) je funk\u010dn\u00e1 entita, ktor\u00e1 obsahuje logiku slu\u017eby CAMEL, ktor\u00e1 s ur\u010ditos\u0165ou rozhoduje o tom, \u010di pre ur\u010dit\u00fd s\u00fabor udalost\u00ed m\u00f4\u017ee po\u017eadovan\u00e1 akcia pokra\u010dova\u0165 zmenen\u00e1, nezmenen\u00e1 alebo preru\u0161en\u00e1. M\u00f4\u017ee sa napr\u00edklad pou\u017ei\u0165 na \u00fapravu odch\u00e1dzaj\u00facich \u010d\u00edsel na pridanie k\u00f3du oblasti alebo medzin\u00e1rodn\u00e9ho form\u00e1tu.<\/p>\n

\u00dato\u010dn\u00edk s pr\u00edstupom k SS7 m\u00f4\u017ee pou\u017ei\u0165 spr\u00e1vu insertSubscriberData na zmenu adresy gsmSCF \u00fa\u010dastn\u00edka na adresu pod jeho kontrolou. \u00dato\u010dn\u00edk potom m\u00f4\u017ee prep\u00edsa\u0165 odch\u00e1dzaj\u00face volan\u00e9 \u010d\u00edsla na \u010d\u00edslo pod svojou kontrolou. V tomto pr\u00edpade \u00fato\u010dn\u00edk prijme odch\u00e1dzaj\u00face volanie, zaznamen\u00e1 ho pred presmerovan\u00edm prev\u00e1dzky do kone\u010dn\u00e9ho cie\u013ea.<\/p>\n

Odpo\u010d\u00favanie - Prich\u00e1dzaj\u00faca prev\u00e1dzka - Presmerovanie hovorov<\/h2>\n

Spr\u00e1va registerSS sa pou\u017e\u00edva na registr\u00e1ciu doplnkov\u00fdch slu\u017eieb pre \u00fa\u010dastn\u00edka. Jednou z t\u00fdchto slu\u017eieb je slu\u017eba presmerovania hovorov. \u00dato\u010dn\u00edk m\u00f4\u017ee pou\u017ei\u0165 spr\u00e1vu registerSS na povolenie presmerovania hovorov na \u010d\u00edslo pod jeho kontrolou. Po prijat\u00ed hovoru potom \u00fato\u010dn\u00edk pou\u017eije spr\u00e1vu eraseSS na zru\u0161enie presmerovania hovoru a n\u00e1sledne presmeruje hovor sp\u00e4\u0165 na \u00fa\u010dastn\u00edka. T\u00fdmto sp\u00f4sobom m\u00f4\u017ee \u00fato\u010dn\u00edk zachyti\u0165 a nahra\u0165 hovor.<\/p>","protected":false},"excerpt":{"rendered":"

Mobiln\u00e1 \u00fastred\u0148a MSC zvy\u010dajne uchov\u00e1va \u0161ifrovacie k\u013e\u00fa\u010de, ktor\u00e9 pou\u017e\u00edva ka\u017ed\u00fd \u00fa\u010dastn\u00edk, aby mohol nadviaza\u0165 hovor. Ke\u010f je \u00fa\u010dastn\u00edk v pohybe, proces odovzdania u\u013eah\u010duje plynul\u00fd prechod \u00fa\u010dastn\u00edka medzi r\u00f4znymi r\u00e1diov\u00fdmi bunkami, pri\u010dom sa zachov\u00e1va priebeh hovoru. V niektor\u00fdch pr\u00edpadoch sa \u00fa\u010dastn\u00edk pres\u00fava z...<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[],"class_list":["post-360","post","type-post","status-publish","format-standard","hentry","category-call-interception"],"yoast_head":"\nSS7 Call Interception<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sms-txt.net\/sk\/zachytenie-hovoru\/ss7-zachytenie-volania\/\" \/>\n<meta property=\"og:locale\" content=\"sk_SK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SS7 Call Interception\" \/>\n<meta property=\"og:description\" content=\"The mobile switching center MSC normally holds the encryption keys used by each subscriber to be able to establish the call. 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