Družina IEEE802 Poddružina IEEE802.1 Priključitev v omrežje IEEE802.1x
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1 1
2 Družina IEEE802 Poddružina IEEE802.1 Priključitev v omrežje IEEE802.1x 2
3 družina standardov, ki opisujejo delovanje lokalnih (LAN) in mestnih (MAN) omrežij delo opravljano v delovnih skupinah več na URL: izziv: Preglejte si spletno stran in preglejte vsebino. 3
4 osnovna arhitektura: spodaj: nadzor dostopa do medija (media access Control, MAC) zgoraj: logična povezavna plast (logical link layer, LLC) ločen dostop do medija in naslavljanje -> prenašanje okvirjev 4
5 enoten naslovni prostor okvirjev (lokalna) mreža mora znati pravilno pošiljati okvirje 5
6 IEEE Management IEEE IEEE IEEE IEEE IEEE IEEE IEEE IEEE IEEE Bridging (networking) and Network Logical Link Control LLC Ethernet Token bus Defines the MAC layer for a Token Ring MANs Broadband LAN using Coaxial Cable Fiber Optic TAG Integrated Services LAN Interoperable LAN Security 6
7 IEEE Wireless LAN (WLAN) & Mesh (Wi-Fi certification) IEEE demand priority IEEE Used for 100BASE-X Ethernet IEEE Cable modems IEEE Wireless PAN (Bluetooth,...) IEEE Broadband Wireless Access (WiMAX certification) IEEE Resilient packet ring IEEE Radio Regulatory TAG IEEE Coexistence TAG IEEE Mobile Broadband Wireless Access IEEE Media Independent Handoff IEEE Wireless Regional Area Network IEEE Emergency Services Working Group (marec 2010) 7
8 Bridging (networking) and Network Management povezovanje med pod-mrežami upravljanje omrežij (npr. najmanjše vpeto drevo) varnost v mrežah deluje na vrhu LLC več na URL: izziv: Preglejte si spletno stran in preglejte vsebino. 8
9 802.1b: upravljanje LAN/MAN (umaknjeno) 802.1d: mostički na MAC plasti 802.1e 802.1g: umaknjeno 802.1h: Ethernet MAC mostički 802.1q: navidezni LAN (VLAN) 802.1x: nadzor priključitve v mrežo (Port Based Network Access Control) 9
10 802.1ab: postaje in nadzor dostopa do medija ter iskanje povezljivosti 802.1ae: varnost na MAC plasti 802.1ar: varno identificiranje enot 802.1as: časovno usklajevanje in časovno občutljive aplikacije v mrežah z mostički 802.1ax: združevanje povezav (link aggregation) 802.1ba: avdio/video sistemi z mostički 10
11 dostop v mrežo je storitev, ki omogoča rabo drugih storitev dostop do medmrežja,... podrobnosti na URL x-2004.html izziv: Preglejte si spletno stran. Kako je z vsebino? 11
12 dostop v mrežo je storitev, ki omogoča rabo drugih storitev dostop do medmrežja,... raba storitve je lahko prosta ali nadzorovana za nadzorovano rabo storitve potrebujemo ugotoviti, kdo je morebitni uporabnik; in ali ima pravico rabe storitve. avtentikacija in avtorizacija (nekje tudi beleženje) naloga: v priključitev v mrežo nekako vplesti AAA 12
13 nastopajo trije gradniki: odjemalec (supplicant) avtentikator (authenticator) avtentikacijski strežnik (authentication server) odjemalec se prijavi avtentikatorju, ki pri avtentikacijskem strežniku preveri njegovo avtentiteto in ali je avtoriziran za dostop do mreže naloga: vgraditi EAP na povezavno plast izziv: Kako(!) avtenitkator dejansko omogoči odjemalcu dostop do mreže? 13
14 standard IEEE 802.1x definira EAP na povezavni plasti EAP over LAN -> EAPOL kasneje je bil EAPOL uporabljen še v drugih pod-družinah IEEE 802.1x: 802.1ae: varnost na MAC plasti 802.1ar: varno identificiranje enot EAPOL je definiran tako, da se njegova vsebina prenaša neposredno v Ethernet okvirjih z vsebinsko značko 0x888E: Preamble (7-bytes) Start Frame Delimiter (1-byte) Dest. MAC Address (6-bytes) Source MAC Address (6-bytes) Length / Type (2-bytes) MAC Client Data (0-n bytes) Pad(0-p bytes) Frame Check Sequence (4-bytes) 14
15 definiran v RFC 3748 podpora za različne avtentikacijske protokole koračni protokol 15
16 inicializacija: ko avtentikator (običajno tudi stikalo, WLAN dostopovna točka ipd.) zazna novega odjemalca, mu omogoči samo IEEE 802.1x komunikacijo od tu naprej se prične EAP protokol 16
17 povabilo: avtentikator (periodično) pošlje odjemalcu povabilo, da se naj predstavi odjemalec se predstavi avtentikatorju, ki predstavitev pošlje avtentikacijskemu strežniku (RADIUS) sedaj je avtentikator samo vmesni strežnik za avtentikacijski strežnik dejansko avtentikacijo izvede vatentikacijski strežnik zaupanje!! med avtentikatorjem in avtentikacijskim strežnikom izziv: Kako sprogramirati to zaupanje? 17
18 pogajanje: se izvaja med odjemalcem in avtentikatorjem v skladu z EAP protokolom kateri avtentikacijski protokol, izziv in odgovor,... 18
19 avtentikacija: sama avtentikacija odjemalca avtentikator, ko strežnik avtenticira odjemalca, dovoli odjemalcu dostop do lokalne mreže 19
20 federacija avtentikacijskih strežnikov, ki si zaupajo uporabnik kateregakoli strežnika se lahko avtenticira pri kateremkoli avtentikatorju v federaciji izziv: Kje je sedaj asimetrična kriptografija, ki jo uporablja EDUROAM v protokolu za avtentikacijo? Za avtentikacijo koga jo uporabljamo? Odgovorite na forum za dodatne točke. 20
21 Hvala za pozornost in veliko uspeha v naprej! 21
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