=== ch11.docx
[chap]11́@lbg[ÑpPbg

lbg[N̐ÉA`IȗLlbg[NƂ͏XႤ̂łBTCPIPƂʓIȒʐMvgR͎g܂AOSIQƃf̉wx֍sƘbXςĂ܂Blbg[N̓̂߁Af[^NwɏdvɂȂĂ̂łB̑w̓̂߁AANZXłf[^ƃLv`@ςĂ܂B
lƁA܂܂1͂𖳐lbg[Nł̃pPbgLv`Ɖ͂ɂĂĂsvcł͂Ȃł傤B̏͂ł́ApPbg͂̊ϓ_ŁAȂlbg[NʂȂ̂A܂̉ۑǂz邩ɂāA񖳐lbg[NLv`̎ʂāAĂ܂B

ʂł̍l@
lbg[Nœ]Ăf[^Lv`A͂Ƃɂ܂lȂ΂Ȃ̂́AIȓ]}̂łB܂ł̓P[uoRŒʐMĂ߁AwɂĂ͍lĂ܂łB͖ڂɌȂdgMŒʐMsApPbg󒆂ьĂ̂łB

x1̃`lLv`
LANiWLANj̃gtBbÑLv`łƂIȂ̂́A̎gшispectrumjLĂ}̂ƂƂłBeNCAgʂ̃lbg[NP[uŃXCb`ɐڑĂLlbg[NƈقȂAlbg[N̒ʐM}̂̓NCAgԂŋLшŁA肪܂BƂAWLAN802.11̎gшɐ߂銄͂ق̂킸ł̂ŁA̋@킪Agш̈قȂ镔gAIԂɂēł̂łB

@lbg[ŃAēdCdqZpҋiIEEEjJ802.11KiɊÂĂ܂B̏͂ɓoꂷ閳lbg[N△LANƂp802.11Kiɏ̂OƂĂ܂B

ш́̕Agш`lɕ邱ƂŎĂ܂B`lƂ802.11̖gшPɕ̂łBčɂ11̃`l܂iɂĂ͂ȏ̃`lꍇ܂jBWLAN͈x1̃`lŒʐM̂ŁA1̃`lLv`邱Ƃ\łi}11-1jB̂߁AႦ΃`l6WLANguV[eBOƂɂ́A`l6ł̃gtBbNLv`悤ɋ@ݒ肷Kv܂B

}11-1@1̃`lLv`łȂ̂ŁÃLv`͖ʓ|
NCAg@ANZX|Cg
gшi11`lj

@`IȖ̃Lv`͓1̃`lłs܂񂪁AOЂƂ܂Bꕔ̖XLAvP[V́Af[^W邽߂ɂ΂₭`l؂ւu`lzbsOvƂeNjbN̗pĂ܂BȂłƂLȃc[Kismet (http://www.kismetwireless.net/)ŁA1bԂɍō10`l܂Ő؂ւ邽߁Ã`l𓯎ɃLv`邱Ƃł܂B

lbg[N̐M
ɂʐMł́A΂΋󒆂`Ăf[^̐҂łȂꍇ܂B܂܂ȕ@ŐM֊邱Ƃ\łBlbg[Nɂ͊ɑΏ@\Ă܂Aꂪ܂삵ȂƂ܂BĖlbg[NŃpPbgLv`Ƃɂ́Adg𔽎˂́Adđ傫Ȃ́AdqWA2.4GHz̃R[hXdbAǁAx̂̂Ƃ߂ɂȂƂmFKv܂B̓pPbgAdpPbgAsȌ`̃pPbgȂǂ̌ɂȂ܂B
`lԂ̊l܂傤BɂЂƂ̃`lLv`łȂƂ͂Aɂ͎኱̒ӂKvłBlbg[N̎gшł͕̈قȂ`lp\łAш悪Ă邽߁A}11-2̂悤Ƀ`lmłdĂ܂B܂`l4ƃ`l5ɃgtBbNƂɁAǂ炩̃`lLv`ĂƂƁÃ`l̃pPbgLv`Ă܂ꍇ̂łBʂɂ́Äɋ閳lbg[ŃA݂ɏdȂ悤Ƀ`l1A6A11g悤݌vĂ邽߁Â悤Ȗ͋Nɂ̂łȀꍇɔAȂԂ邩𗝉Ă܂傤B

}11-2@gш悪Ă邽߂Ƀ`lmdĂ
`lg̒liGHzj

MoA͂
M̃guV[eBÓAWiresharkŃpPbg邾łł悤Ȃ̂ł͂܂BLAÑguV[eBOŌoςނ߂ɂ́AIɐMmFKv܂B́AM̐f[^gш̊\c[AXyNgAiCUgΉ\łB

Ɨp̃XyNgAiCU͐h͂܂AIɎg\[V܂BMetaGeekWi-SpyƂíA802.11gŜ̊ĎUSB@łBMetaGeekChanalyzerƂ\tgEFAƑgݍ킹ƁAWi-Spy͎gшo͂OtĂ܂B̗}11-3Ɏ܂B

}11-3@Chanalyzeȑo͂ɂē̈ŕ̖LAN삵Ă̂킩

LANJ[h̃[h
lbg[ÑpPbgLv`OɁALANJ[h̃[hɂĒmĂ܂傤B
LANJ[hɂ4ނ̃[h܂B

}l[Wh[hiĖ󒍁FLAN̐Eł̓CtXgN`[hƌĂԂƂłj
}l[Wh[hł́ANCAg̓ANZX|CgiWAPFWireless Access Pointjɒڐڑ܂B̃[hł́ANCAg̓ANZX|CgɒʐM̐C܂B

AhzbN[h
AhzbN[h́ANCAgmږĒʐMƂɎg܂B̃[hł͒ʐMs2̃NCAgAANZX|Cg̑ɒʐM𐧌䂵܂B

}X^[h
nCGhȖLANJ[h́A}X^[hT|[gĂ܂B̃[hł́AʂȃhCo\tgEFAɂANCAgANZX|Cĝ悤ȖSƂł܂B

j^[h
ꂪƂdvȃ[hłBj^[h̖LANJ[h́Af[^̑Ms킸ɁAьpPbgĎƂɗp܂BWiresharkŖLAÑpPbgLv`ꍇ́ALv`Rs[^̖LANJ[hj^[hT|[gĂKv܂BpPbgLv`邽߂ɖLANJ[h𔃂Ƃ́Aj^[hiRFMON[hƂĂ΂܂jT|[gĂ邱ƂmFĂB

LANJ[ĥقƂǂ̓}l[Wh[hAhzbN[hɂȂĂ܂Be[h̓}11-14Ɏ܂B

}11-4@LANJ[h̃[h
NCAg@}l[Wh[h@ANZX|Cg@NCAg
NCAg@AhzbN[h@NCAg
NCAg@}X^[h@NCAgi}X^j@NCAg
NCAg@j^[h@NCAgij^j@NCAg

@pPbg͂ɂ͂ǂ̖LANJ[h悢Ƃ悭܂BggĂāAԂ߂̂uALFA 1000mW USBvA_v^łBǂ̃pPbgłmɃLv`łAƂꂽiƂč]Ă܂BC^[lbg̃Rs[^n[hEFATCg̑唼œ\łB

Windowsł̖lbg[ÑLv`
j^[hT|[gĂ閳LANJ[hgĂĂAWindowsLANJ[hhCoł͂̃[hgƂł܂iWinPcapT|[gĂ܂jBLv`sɂ͒ǉ̃n[hEFAKvłB

AirPcap̐ݒ
AirPcapiCACE TechnologiesA݂RiverbedPFhttp://www.cacetech.com/j́AWindowsŖLAÑpPbg͂s߂ɐ݌vꂽ̂łBAirPcap͖LANł̃pPbgLv`̂߂ɐ݌vꂽUSBtbVhCułi}11-5jBAirPcap3͂ŐWinPcaphCogĂAp̐ݒʂ܂B

}11-5@AirPcap̓RpNgŃm[gPCƈꏏɊȒPɎ^т\

AirPcap̐ݒ̓IvVȂ̂ŔɊȒPłB}11-6[AirPcap Control Panel]ȉ̃IvVݒ\łB

[Interface]
Lv`ɎgfoCXIł܂Bxȉ͂sꍇ́AAirPcapgĕ̃`l𓯎ɃLv`Kvꍇ܂B
[Blink Led]
AirPcapLED_ł܂B̋@\͎ɁAAirPcapgĂƂɁAǂgĂ邩߂̂̂łB
[Channel]
ł́AAirPcapgăLv``lI܂B
[Indlude 802.11 FCS in Frames]
OSɂẮAftHgŖLANpPbg̃`FbNT̍Ō4rbg菜Ă܂Ƃ܂B̃`FbNTFCSiFrame Check SequencesjƌĂ΂ĂA]ĂԂɃf[^jĂȂƂۏ؂邽߂ɎgĂ܂BɗRȂ΁A`FbN{bNXIɂFCS`FbNT폜Ȃ悤ɂ܂傤B
[Capture Type]
[802.11 Only][802.11 + Radio]Ƃ2̃IvV܂B[802.11 Only]ƂIvV́AWI802.11̃pPbg̃wb_Lv`ƂƂłB[802.11 + Radio]́Af[^̓]xAgAMxmCYx܂ރWI^bvwb_Lv`܂B\ȂׂĂ̏悤ɂ邽߁A[802.11 + Radio]I܂傤B
[FCS Filter]
[Include 802.11 FCS in Frames]̃`FbN{bNXIɂĂȂĂÃIvVLɂĂFCS̃`FbNɂf[^jĂƔf΃pPbg̓tB^܂B[Valid Frames]IvVIɂ΁AFCS̃`FbNɂf[^MꂽƔfꂽ̂\܂B

[WEP Configuration]
̉ʁiAirPcap Control Panel[keys]^uQƉ\jł́ALv`lbg[NWEPL[͂AWEPɂĈÍꂽf[^߂ł悤ɂ܂BWEPL[ɂẮHHHy[ẂuCXZLeBxxxxxv̍Ő܂B


}11-6@AirPcap̐ݒpvO


AirPcapgpPbgLv`
AirPcapCXg[Đݒ肵AWiresharkN[Capture][Options]IA[Interface]AirPcapfoCXI܂y1zi}11-7jiĖ󒍁F{M_ōŐVł1.8.0ł́AP.xxx̐}3-4Ő悤ɁAUIقȂĂA[Wireless Settings]Ƃ{^}3-4̉ʂőIfoCX_uNbNƕ\}4-8c[Edit Interface Settings]_CAOɑ݂܂jB

}11-7@Lv`C^tF[XƂāAAirPcapfoCXI

[Wireless Settings]Ƃ{^ȊO͌ꂽʂƎv܂B̃{^NbNAirPcap̐ݒpvOƓIvV\܂i}11-8jBWiresharkAirPcapƊSɓĂ邽߁AAirPcapŐݒł邱ƂWiresharkłݒł܂B

}11-8@[Advanced Wireless Settings]_CAOłWiresharkAirPcap̐ݒ肪ł

ݒ肪ׂďIA[Start]{^ăpPbgLv`JnĂB

Linuxł̖lbg[ÑLv`
Linuxł̃pPbgLv`ɕKvȂ̂́ALANJ[hj^[hɂ邱ƂłBcOȂ烂j^[hɕύX菇͖LANJ[hƂɈقȂ邽߁Ał̂肩邱Ƃ͂ł܂BLANJ[hɂĂ͕ύXsvȂ̂܂B̖LANJ[hɂāAGoogleŌĂ݂ĂB
LinuxŖLANJ[hj^[hɕύXƂʓIȕ@́ALinuxɃrgCĂ@\gƂłBiwconfigR}hg΁ALANJ[hݒł܂BR\[iwconfigsƁAȉ̂悤ȌʂɂȂ܂B

$ iwconfig
Eth0 no wireless extensions
Lo0 no wireless extensions
Eth1 IEEE 802.11g ESSID: "Tesla Wireless Network"
Mode: Managed Frequency: 2.462 GHz Access Point: 00:02:2D:8B:70:2E
Bit Rate: 54 Mb/s Tx-Power-20 dBm Sensitivity=8/0
Retry Limit: 7 RTS thr: off Fragment thr: off
Power Management: off
Link Quality=75/100 Signal level=-71 dBm Noise level=-86 dBm
Rx invalid nwid: 0 Rx invalid crypt: 0 Rx invalid frag: 0
Tx excessive retries: 0 Invalid misc: 0 Missed beacon: 2

iwconfigR}ȟʂA802.11gƂLANvgRɂĂ̏񂪕\ĂEth1LANC^tF[Xł邱Ƃ܂BEth0Lo0ł͖LAN͎g܂B
Eth1ƕ\Ăs̉̍sĂBiwconfigR}hsē閳LANJ[hESSIDiExtended Service Set IDjgȂǂ̏ƂƂɁA[hManagedłƕ\Ă܂BύXKv܂B
Eth1j^[hɕύXɂrootKvȂ̂ŁAsuR}hŃ[UύX܂B

$ su
Password: <root̃pX[h>

rootɂȂ΁ALANJ[h̃IvVݒ肷R}hs邱Ƃł܂BEth1j^[hɂɂ́Aȉ̃R}hsĂB

# iwconfig eth1 mode monitor

j^[hɕύXAiwconfigxsĕύXLɂ܂Bȉ̃R}hsĂB

# iwconfig eth1 up

iwconfigR}hŃ`l؂ւ邱Ƃł܂BEth1̃`l3ɐ؂ւɂ́Aȉ̃R}hsĂB

# iwconfig eth1 channel 3

@pPbgLv`ĂԂɂ`l؂ւ邱Ƃł̂ŁAȂύXĂBXNvgĂ܂΂ȒPɎs邱Ƃł܂B

ݒ肪IWiresharkNApPbgLv`JnĂB

802.11̃pPbg\
LANƗLLAÑpPbg̈Ⴂ́A802.11wb_邩ȂłB̃C2wb_ɂ̓f[^]Ɏg}̂̏񂪊܂܂Ă܂B802.11pPbgɂ3̃^Cv܂B

}l[Wg
2wŃzXgԂ̃RlNVm邽߂ɎgpPbgłB}l[WgpPbg̃Tu^Cvɂ́AF؁AA\VG[VAr[RpPbg܂B

Rg[
}l[WgpPbgƃf[^pPbgzApPbgtsǗs܂BʓIȃTu^CvƂRTSiRequest-to-sendjCTSiClear-to-sendjpPbg܂B

f[^
ۂ̃f[^܂񂾃pPbgŁA܂LANLLAN֓]\ȗB̃pPbg^CvłB

802.11pPbg̍\́ApPbg̃^CvƃTu^Cv̑gݍ킹ɂČ܂܂Bgݍ킹͂Ȃ̐ɂȂ܂Ał80211beacon.pcapt@C̃pPbgŁÂЂƂĂ݂܂傤B̃t@Cɂ͐}11-9Ɏ悤ɁAr[RƂ}l[WgpPbg̃Tv܂܂Ă܂B

}11-9@802.11r[RpPbg

r[R͖LANł̒ʐMɂĂƂLvȃpPbg1łBr[R̓ANZX|Cg`l܂u[hLXgpPbgƂđMpPbgŁAANZX|Cgɐڑ\ȃNCAgɑ΂āAڑɕKvȃp[^񎦂邽߂ɑM܂BTvł́ÃpPbg802.11wb_Type/subtypeŃr[Rƒ`Ă܂y1zB
802.11 wireless LAN management framewb_ɂ́Aȉ̏܂ޑ̏񂪊܂܂Ă܂B

Timestamp@pPbg]ꂽ
Beacon Interval@r[RpPbgđ܂ł̊Ԋu
Capabilities Information@ANZX|Cg̃n[hEFA\ɂĂ̏
SSID Parameter Set@ANZX|Cgu[hLXgĂSSIDilbg[Nj
Supported Rates@ANZX|CgT|[gĂf[^̓]x
DS Parameter@ANZX|Cgu[hLXgĂ`l

wb_ɂ́AMƈ̃AhXx_L̏܂܂Ă܂B
̏ƂɁAr[R𑗐MĂANZX|CgɂĂȂ̏񂪓܂B802.11bKiiBjy3zɂD-LinkЂ̃foCXy2zŁA`l11y4zgĂ邱Ƃ܂B
802.11}l[WgpPbg̒gړI͂낢날܂AʓIȍ\͂̃TvƓłB

lbg[NL̏Packet ListsyCɒǉ
WiresharkPacket ListsyCɂ͒ʏ6̃J܂Blbg[N̉͂֐i߂OɁAPacket ListsyCɐV3̃JǉĂ܂傤B

ERSSIiReceived Signal Strength IndicationFMMxjJBLv`pPbg̖giRFjM̋x܂B
ETX RateiTransmission RatejJBLv`pPbg̃f[^]x܂B
EFrequency/ChannelJBgƁApPbgWꂽ`l܂B

͖̏lbg[Nł̃guV[eBOɂđ傫ȏɂȂł傤BƂ΃NCAgM̋xƎĂƂɁÃJΖ{ǂmF邱Ƃł܂B
̃JPacket ListsyCɕ\ɂ́Aȉ̎菇ɏ]ĂB

1DCj[[Edit][Preference]NbN܂B
2D[Columns]ZNVI[Add]{^NbN܂B
3D[Title]J̃eLXg{bNXRSSIƓ͂Aɂ[Field type]hbv_EXg[IEEE 802.11 RSSI]I܂B
4DTX RateFrequency/ChannelJɂĂ菇JԂA[Field type]hbv_EXgłꂼ[IEEE 802.11 TX Rate][Channel/Frequency]I܂B}11-10͈ȏ̎菇I[Preferences]EBhEłB
5D[OK]NbNĕύXۑ܂B
6DWiresharkċNĐVJ\܂B

}11-10@LANL̏\JPacket ListsyCɒǉ
(Figure11-10.tiff)

lbg[NL̃tB^
tB^̗LpɂĂ4͂Ő܂BLlbg[Nł͊eʐM@ɃP[uLтĂ邽߁ALv`pPbĝ݂Lv`tB^͊ȒPɍ邱Ƃł܂BȂAlbg[Nł͋@ɂĔ邷ׂẴgtBbN`lɋĂA1̃`lLv`Ƃ܂܂ȋ@̃gtBbN݂`ŋL^܂Bł́A߂pPbĝ݂Lv`ł悤ȃtB^̍wт܂B

BSSIDŃtB^O
lbg[N̊eANZX|Cgɂ́ABSSIDiBasic Service Set IdentifierjƌĂ΂ŗL̎ʎq蓖ĂĂ܂BANZX|CgM閳LAÑ}l[WgpPbgƃf[^pPbg̒ɂ́A̖O܂܂Ă܂B
͂悤ƂĂBSSID΁AƂ͂̃ANZX|Cg瑗MpPbg邾łBWiresharkł́APacket ListsyCInfoJŃpPbg𑗐MĂANZX|Cg\Ă܂̂ŁAړĨpPbgô͊ȒPł傤B
͂LAÑANZX|Cg瑗MĂpPbgA802.11wb_BSSIDmF܂傤BꂪtB^̊{ƂȂAhXłBBSSIDMACAhXmFłÂ悤ȃtB^g܂B

wlan.bssid.eq 00:11:22:33:44:55:66

ł̃ANZX|CgoRgtBbN݂̂Lv`悤ɂȂ܂B

pPbg^CvɂtB^O
̏͂̍ŏŁAlbg[ÑpPbgɂ͂̃^CvƂƂ܂B̃^CvTu^CvɂăpPbgtB^O邱ƂKvƂȂ邱Ƃł傤B^CvɂĂwlan.fc.typeA^CvƃTu^Cvgݍ킹ꍇwc.fc.type_subtypeƂtB^gƂł܂BƂNULLf[^pPbgi16iŃ^Cv2ATu^Cv4̃pPbgjtB^ꍇAwlan.fc.type_subtype eq 0x24ƂtB^p邱Ƃł܂Blbg[ÑpPbg^CvƃTu^CvŃtB^ۂɕKvɂȂƎvtB^\11-1Ɏ܂B

\11-1@lbg[Ñ^Cv^Tu^CvƑΉtB^ꗗ
^Cv^Tu^Cv@tB^\
}lWgt[
Rg[t[
f[^t[
A\VG[VNGXgiAssociation requestj
A\VG[VX|XiAssociation responsej
A\VG[VNGXgiReassociation requestj
A\VG[VX|XiReassociation responsej
v[uNGXgiProbe requestj
v[uX|XiProbe responsej 
r[R
fBXA\VG[giDisassociatej 
I[ZeBP[ViAuthenticationj 
fI[ZeBP[ViDeauthenticationj
ANVt[iAction framesj 
ubNACK NGXgiBlock ACK requestsj
ubNACKiBlock ACKj 
PS-PolliPower save pollj 
RTSiRequest to sendj 
CTSiClear to sendj 
ACK 
CF-EndiContention free period endj 
NULL f[^iNULL dataj 
QoS f[^iQoS dataj
Null QoS f[^iNull QoS dataj 


gɂtB^
̃`l̃pPbg܂ރgtBbN𒲍Ƃ́A`lɊÂtB^ɖ𗧂܂BƂ΃`l16ȊÕgtBbNĂقȂƂꍇ́A܂11`lׂẴgtBbN\悤ɃtB^ݒ肵A2̃`lȊOŃgtBbN΁Aݒ~XʐM@̏QȂǁA肪ƂƂɂȂ܂BgʂɃtB^sɂ́Â悤ȍ\g܂B

radiotap.channel.freq == 2412

̓`l1ׂ̂ẴgtBbN\܂B2422̒lʂ̎gɕς΁Ã`lɑ΂tB^s܂B\11-2͊e`l̎g̈ꗗłB

\11-2@`lƎg
`l@g

lbg[ÑgtBbNɑ΂LpȃtB^͉SƂ܂BLv`tB^̃Tvhttp://wiki.wireshark.org/Wireshark WikiQƂĂB

lbg[ÑZLeB
lbg[NWJAǗƂ̍ő̌OAMf[^̃ZLeBłBf[^͋󒆂ł߁AmĂΒNłRɉł܂̂ŁAf[^̈ÍdvłB܂AWiresharkAirPcapJ[h΁ANłf[^̂łB

@SSLSSHȂǂ̕ʂ̑ẅÍgƁAgtBbN͂̑wł͈Í邽߁A[U̒ʐMeXjbt@œǂނƂ͂ł܂B

lbg[NŃZLAɃf[^𑗐M@ƂēD܂Ă̂AWEPiWired Equivalent PrivacyjKiłBWEP͈ÍL[̊Ǘ@ɂ̎_܂ŁANɂ킽Ăx̍LĂ܂AZLeB̂߂ɁAVȋKi肳܂BꂪWPAiWi-Fi Protected AccessjWPA2KiłBWPAAZLAɂȂWPA2ɂ_͂܂AWEP͂͂邩ɈSŁApɑςƍlĂ܂B
̍łWEPWPÃgtBbNAF؂̎sĂ܂B

WEPF؂̐
t@C80211-WEPauth.pcapɂ́AWEPLȖlbg[Nւ̐ڑ̐
܂܂Ă܂B̃lbg[ÑZLeB́AWEPL[ŕی삳Ă܂BF؂ɐāAÍꂽf[^M邽߂ɁAANZX|CgɓnKv̂WEPL[łBlbg[ÑpX[hƍl΂ł傤B
}11-11Ɏ悤ɁALv`t@C̓ANZX|Cg(00:11:88:6b:68:30) NCAgi00:14:a5:30:b0:afjɁA4Ԗڂ̃pPbgŃ`WMƂ납n܂Ă܂y1zBNCAgWEPL[ǂmF̂`W̖ړIłB`ẂA802.11wb_WJTagged parametersQƂƊmFł܂B

}11-11@ANZX|CgNCAgɃ`WMĂ

`W5Ԗڂ̃pPbgACK܂BNCAǵAWEPL[gĈÍꂽ`W̃eLXg𕜍A}11-12̂悤ɃANZX|Cgɕԋp܂y1zB

}11-12@NCAg͕`WANZX|Cgɕԋp

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WEPF؂̎s
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WPAF؂̐
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WPAF؂̎s
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}11-19@EAPOLpPbg̐WPAF؂̎sĂ

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܂Ƃ
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