suEXEC セキュリティモデルをベースにしたコンテナ起動時のバリデーションの提案 / A suEXEC-based validation in containers' startup

2cf373725ded741824c50fd571eda6e1?s=47 KONDO Uchio
May 12, 2018
Technology
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920

suEXEC セキュリティモデルをベースにしたコンテナ起動時のバリデーションの提案 / A suEXEC-based validation in containers' startup

wsa研第二回発表資料
予稿: https://github.com/udzura/wsa-sg-2nd-draft/tree/master/draft#suexec-%E3%82%BB%E3%82%AD%E3%83%A5%E3%83%AA%E3%83%86%E3%82%A3%E3%83%A2%E3%83%87%E3%83%AB%E3%82%92%E3%83%99%E3%83%BC%E3%82%B9%E3%81%AB%E3%81%97%E3%81%9F%E3%82%B3%E3%83%B3%E3%83%86%E3%83%8A%E8%B5%B7%E5%8B%95%E6%99%82%E3%81%AE%E3%83%90%E3%83%AA%E3%83%87%E3%83%BC%E3%82%B7%E3%83%A7%E3%83%B3%E3%81%AE%E6%8F%90%E6%A1%88

26枚目について、発表時から指摘を受け修正しています

2cf373725ded741824c50fd571eda6e1?s=128

KONDO Uchio

May 12, 2018
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Transcript

  1. 1.

    6DIJP,POEP(.01FQBCP *OD 84"ݚڀձ TV&9&$ηΩϡϦςΟϞσϧΛ ϕʔεʹͨ͠ίϯςφىಈ࣌ͷ όϦσʔγϣϯͷఏҊ

  2. 2.

    ΤϯδχΞ ۙ౻Ӊஐ࿕!VE[VSB ٕज़෦ٕज़ج൫νʔϜ

  3. 3.

    ໨࣍  લఏ  ίϯςφ؀ڥఏڙͷࡍͷηΩϡϦςΟత՝୊  લఏ  ίϯςφʹ·ͭΘΔηΩϡϦςΟػߏͷ੔ཧ 

    ఏҊ͢ΔόϦσʔγϣϯػߏʹ͍ͭͯ  ՝୊ɾٞ࿦͍ͨ͜͠ͱ
  4. 4.

    ίϯςφ؀ڥఏڙͷࡍͷ ηΩϡϦςΟత՝୊

  5. 5.

    8FCαʔϏεఏڙͰͷίϯςφͷར༻ w ಥൃతΞΫηε૿ͳͲ΁ͷରॲͷͨΊɺ8FCαʔϏεͷӡ༻ऀ͸ߴ଎͔ͭॊೈͳϦιʔ ε੍ޚΛ͍ͨ͠ɻ w ٸͳϦιʔε௥Ճ΁ͷରԠɺෆཁͳ࣌͸ݮΒ͢ɺͳͲɻ w ίϯςφ͸ͦͷىಈͷߴ଎͞ͳͲͷੑ࣭͔Βɺͦͷ໨తʹ͓͋ͬͯΓීٴ͕ਐΈͭͭ ͋Δɻ w

    )BDPOJXB࿦จ Ͱ΋͜ͷલఏʹ͍ͭͯड़΂͍ͯΔ w ࠓճ͸ͦͷதͰ΋ɺϗεςΟϯά؀ڥʹ͓͍ͯߴ଎͔ͭॊೈͳϦιʔε੍ޚΛ࣮ݱ͢ ΔͨΊʹίϯςφΛར༻͢Δʹ͋ͨΓɺηΩϡϦςΟͷ໰୊Λ੔ཧ͢Δ IUUQTSBOEQFQBCPDPNQBQFSTJQTKODVE[VSBQEG
  6. 6.

    ίϯςφఏڙ࣌ͷηΩϡϦςΟత՝୊  ίϯςφͷ಺෦͔ΒɺίϯςφΛϗετ͍ͯ͠Δ਌ͷ04ʹʮ୤ࠈʯ͕Ͱ ͖Δ৔߹  ίϯςφͷ಺෦͔Βɺίϯςφͷ֎෦؀ڥ͕ݟ͑ͨΓૢ࡞Ͱ͖Δ৔߹  ίϯςφͷ಺෦ʹ͍ͭͯɺαʔϏεఏڙऀ͕ҙਤ͠ͳ͍ઃఆมߋ΍ϑΝΠ ϧͷૢ࡞͕Ͱ͖Δ৔߹ 

    ίϯςφͷىಈ࣌ʹɺαʔϏεఏڙऀ͕ҙਤ͠ͳ͍ίϚϯυɺҾ਺ɺݖ ݶͰͷىಈΛ͞ΕΔ৔߹
  7. 7.

    ίϯςφͷ಺෦ˠίϯςφͷϗετ w͍ΘΏΔʮ୤ࠈʯ -JOVY/BNFTQBDF DISPPU $POUBJOFST )PTU04 VODISPPUIUUQTHJTUHJUIVCDPN'JMP4PUUJMF ❌ ❓❓ ௨ৗɺίϯςφ಺෦͔Βϗετͷ৘

    ใ͸ɺ-JOVY/BNFTQBDFͳͲʹΑ Γִ཭͞ΕΞΫηεͰ͖ͳ͍ ⚠੬ऑੑɺઃఆϛεɺ࢓্༷ͷൈ͚݀ ͳͲʹΑΓ֎෦ͷ৘ใʹΞΫηεͰ͖Δ ͜ͱ͕͋Δʹʮ୤ࠈʯ
  8. 8.

    ίϯςφͷ಺෦ˠݟͤͨ͘ͳ͍֎෦ wωοτϫʔΫ্ͷଞͷϗετ΁ͷΞΫηεɺ௨৴ͷ๣ௌͳͲ B C D E ίϯςφB ͷ؀ڥΛ֎෦ʹఏڙ͢Δ৔߹ɺ B ͔Βݟ͑ͯ͸͍͚ͳ͍ϛυϧ΢ΣΞD

    ʹΞΫηεͰ͖Δɺ B ͔Β؅ཧίϯςφE ʹΞΫηεͰ͖ΔɺͳͲ B ͱE ͕ಉ͡WYMBOͷ৔߹ͳͲ΋ߟ͑ΒΕΔͩΖ͏ 0, TFDSFU "ENJODPOUBJOFST $POUBJOFSTUPQSPWJEF ❌ ⭕ ❌
  9. 9.

    ίϯςφͷ಺෦Λӽݖతʹૢ࡞Ͱ͖Δ wίϯςφ಺෦ͷಛݖΛ༩͍͑ͯͳ͍ͷʹɺϑΝΠϧΛૢ࡞Ͱ͖Δ FUDQBTTXE FUDTIBEPX FUDOHJOYOHJOYDPOG QSPDTZT  WBSSVOEPDLFS  "$POUBJOFS

    ίϯςφ಺ͷ௨ৗϢʔβʔ ·ͨ͸ݖݶ੍ݶ͞ΕͨSPPU ౰વɺෆཁͳϑΝΠϧૢ࡞͸ෆՄ ⚠੬ऑੑͳͲͷར༻Ͱ SPPUʹͳΔ ⚠ઃఆ࿙ΕͳͲͰ ෆཁͳݖݶ͕෇͍ͯݖݶୣऔ ૢ࡞ ૢ࡞ ⚠ݖݶઃఆΛޡͬͯ ෇༩Ϛ΢ϯτ͢Δ͜ͱ΋
  10. 10.

    ҙਤ͠ͳ͍Φϓγϣϯ౳Ͱίϯςφىಈ wίϯςφͷىಈΛϢʔβͰίϯτϩʔϧͰ͖Δ৔߹͕͋Δ ਖ਼ৗͳઃఆͰىಈ ෆਖ਼ͳઃఆͰىಈɺ ͦͷޙෆਖ਼ͳૢ࡞ ίϯςφͰ͸ͳ͍ ϛυϧͳͲΛ ىಈͤ͞ΒΕΔ ίϯςφىಈͷܖػ ͱͳΔΠϕϯτ

    $*αʔϏε౳ δϣϒ։࢝ 'BTU$POUBJOFS લஈͷΠϕϯτΛड͚औΔ૚ OHY@NSVCZEPDLFSE ίϯςφϥϯλΠϜ ⚠ෆਖ਼ͳύϥϝʔλΛ౉͞ΕΔɺͳͲ
  11. 11.

    ίϯςφʹ·ͭΘΔ ηΩϡϦςΟػߏͷ੔ཧ

  12. 12.

    ίϯςφʹؔ͢ΔηΩϡϦςΟػߏ " 6TFS/BNFTQBDF # ,FSOFM$BQBCJMJUJFT $ TFDDPNQ % .BOEBUPSZ"DDFTT$POUSPM &

    4FSWJDF.FTIJOH ' 3PPUMFTT6OQSJWJMFHFEDPOUBJOFST ( )ZQFSWJTPST
  13. 13.

    6TFS/BNFTQBDF wϗετ໊ͳͲͷΑ͏ʹຊདྷ04άϩʔόϧʹଘࡏ͢ΔϦιʔεʹ͍ͭͯ
 04಺෦Ͱ໊લۭؒΛ࡞੒͠ɺ
 ෳ਺Λଘࡏͤ͞࢖͍෼͚Δ
 -JOVY/BNFTQBDF  wϢʔβ*%ʹ໊͍ͭͯલۭؒΛ
 ࡞ΓɺϗετͷඇSPPUΛ
 ίϯςφͷ؅ཧऀʹɻ

  14. 14.

    ,FSOFM$BQBCJMJUJFT wSPPUͷ࣋ͭಛݖΛɺ෼ׂ͠ɺҰ෦Λണୣ͋Δ͍͸෇༩Ͱ͖Δ $"1@$)08/ $"1@,*-- $"1@4:4@5*.& $"1@4:4@"%.*/ $"1@/&5@3"8 $"1@/&5@#*/%@4&37*$&  5SBEJUJPOBM

    SPPU $BQBCJMJUJFT -JNJUFE SPPU VTSMPDBMCJOTFSWFSGPP Ұ෦ૢ࡞͕Ͱ͖ͳ͍
 SPPU FH࣌ؒૢ࡞͕Ͱ͖ ͳ͍ɺLJMMͰ͖ͳ͍ ҰൠϢʔβ͕ىಈͯ͠΋ ಛݖϙʔτΛϦοεϯͰ͖ΔɺͳͲ Ұ෦Λണୣ Ұ෦Λ ϑΝΠϧʹ෇༩
  15. 15.

    TFDDPNQ.BOEBUPSZ"DDFTT$POUSPM wϢʔβͷࠓͷݖݶʹ͔͔ΘΒͣɺҰ෦ૢ࡞Λ੍ݶɾ؂ࠪ͢Δ wTFDDPNQͰ͋Ε͹γεςϜίʔϧɺ."$Ͱ͋Ε͹ϑΝΠϧΞΫηεͳͲ SPPU TFDDPNQͷίϯςΫετ "QQ"SNPSͷϓϩϑΝΠϧ SPPUͷ࡞੒ͨ͠ϓϩηε SPPUͷ࡞੒ͨ͠ϓϩηε ,FSOFM04 γεςϜίʔϧݺग़

    ϑΝΠϧΞΫηεɺ ιέοτར༻ͳͲ ❌ ❌ ⭕ ⭕
  16. 16.

    4FSWJDF.FTIJOH wίϯςφಉ࢜ͷ૬ޓͷωοτϫʔΫɺૄ௨ΛɺίʔυͳͲʹΑΓίϯτϩʔϧ ͢Δ͜ͱΛ4FSWJDF.FTIͱݺͼɺίϯςφͷจ຺Ͱ࢖ΘΕΔ /PEF1PPMෳ਺ͷ෺ཧϗετΛ୯Ұͷϓʔϧͱͯ͠ѻͬͨ΋ͷ 4FSWJDF.FTI $POUSPM1MBOF ίϯςφಉ࢜ͷૄ௨ͷڐՄېࢭ FHηΩϡϦςΟάϧʔϓ  ίϯςφؒͷ௨৴ͷ؂ࠪ

    ௨৴ܦ࿏ͷ҉߸Խ 5-4ଞ  ❌ ⭕ ✈
  17. 17.

    3PPUMFTT6OQSJWJMFHFEDPOUBJOFST w  όΠφϦࣗମΛTFUVTFSJESPPU͢Δ w  -9$ํࣜͷඇಛݖίϯςφʢ6TFS/BNFTQBDFΛར༻ʣ w  /55ਢాࢯʹΑΔ3PPUMFTTSVOD΄͔ʢػೳ੍ݶ͋Γʣ

    w ϝϦοτɾσϝϦοτ·ͱΊ όΠφϦͷTFUVJESPPU όΠφϦͷݖݶ͕େ͖͘ɺ ͞ΒͳΔ੍ޚΛ͢ΔͨΊͷରԠ͕ඞཁ -9$ํࣜͷඇಛݖίϯςφ Ұ෦όΠφϦΛTFUVJESPPU͢ΔͷͰ ίϯςφͷػೳͷมԽͰ௥ՃͳͲରԠ͕ඞཁ 3PPUMFTTSVOD ωοτϫʔΫ͕UBQͷΈͳͲ ػೳʹ੍ݶ͕͋Δ
  18. 18.

    )ZQFSWJTPS౳ͷར༻ʢ༧ߘͰ͸ະݴٴʣ wίϯςφٕज़ͷηΩϡϦςΟػߏͷଟ͘͸04ͷதͰด͍ͯ͡Δ͕ɺ
 ܰྔͳϋΠύʔόΠβͳͲΛར༻͠ɺͦͷൣғΛ௒͑ͨαϯυϘοΫ εԽΛ࣮ݱ͢Δٕज़͕ݱΕ͍ͯΔ wH7JTPS ͷ3&"%.&ΑΓ IUUQTDMPVEQMBUGPSNHPPHMFCMPHDPN0QFOTPVSDJOHH7JTPSBTBOECPYFEDPOUBJOFSSVOUJNFIUNM

  19. 19.

    Ґஔ෇͚Δ w՝୊͸ΧʔωϧίϯςφϥϯλΠϜͰखް͘Χόʔ w՝୊͸4FSWJDF.FTIͷਐԽͰ w՝୊͸ඇಛݖίϯςφ͕
 ༗ޮ͔

  20. 20.

    ՝୊΁ͷରԠ ػೳ໊ ରԠՄೳͳ՝୊ 6TFS/BNFTQBDF      ,FSOFM$BQBCJMJUJFT

       TFDDPNQ    .BOEBUPSZ"DDFTT$POUSPM      4FSWJDF.FTI  ඇಛݖίϯςφ  ϋΠύʔόΠβͷར༻   
  21. 21.

    ՝୊΁ͷରԠ͸ݶఆత ػೳ໊ ରԠՄೳͳ՝୊ 6TFS/BNFTQBDF      ,FSOFM$BQBCJMJUJFT

       TFDDPNQ    .BOEBUPSZ"DDFTT$POUSPM      4FSWJDF.FTI  ඇಛݖίϯςφ  ϋΠύʔόΠβͷར༻   
  22. 22.

    ఏҊ͢Δ όϦσʔγϣϯػߏʹ͍ͭͯ

  23. 23.

    ఏҊ͢Δख๏ wTV&9&$ηΩϡϦςΟϞσϧ ϕʔεͷݕࠪಋೖ wTV&9&$ηΩϡϦςΟϞσϧ "QBDIF)551αʔό͕$(*͋Δ͍͸44*Λ࣮ߦ͢Δࡍʹɺ"QBDIF ࣗମͷϢʔβ*%ͱ͸ҟͳΔϢʔβ*%Ͱ࣮ߦ͢Δࡍʹߟྀ͍ͯ͠Δ Ϟσϧ w ՝୊΁ͷ͞ΒͳΔରԠʹओ؟Λஔ͘ IUUQTIUUQEBQBDIFPSHEPDTKBTVFYFDIUNM

  24. 24.

    TV&9&$ηΩϡϦςΟϞσϧͱ͸ w·ͣɺTV&9&$ʹ͍ͭͯ "QBDIF VTFSBQBDIF $(*QSPDFTT VTFSVTFS $(*QSPDFTT VTFSVTFS TVFYFDίϚϯυ IPTUGPPFYBNQMFKQ

    IPTUCBSFYBNQMFKQ 7JSUVBM)PTU ͝ͱͷઃఆ $(*ͳͲͷ࣮ߦ ͓ޓ͍ʹݖݶ෼཭ γεςϜྖҬ΋ݟ͑ͳ͍ "QBDIFͷઃఆ౳
  25. 25.

    TV&9&$ηΩϡϦςΟϞσϧ͕ඞཁͳཧ༝ wTFUVTFSJESPPU͞ΕͨόΠφϦΛܦ༝࣮ͯ͠ݱ͍ͯ͠ΔͨΊ "QBDIF VTFSBQBDIF $(*QSPDFTT VTFSVTFS $(*QSPDFTT VTFSVTFS TVFYFDίϚϯυ IPTUGPPFYBNQMFKQ

    IPTUCBSFYBNQMFKQ TFUVJE  ͳͲΛ࣮ߦ͢ΔͨΊɺ TVFYFDίϚϯυ͸TFUVTFSJESPPU ͞ΕͨόΠφϦͱͳ͍ͬͯΔɻ ඞཁҎ্ͷૢ࡞͕Ͱ͖ͳ͍Α͏ͳ Կ͔͠Βରࡦ͕ඞਢ "QBDIFͷઃఆ౳
  26. 26.

    ίϯςφΠϕϯτΛड͚औΔલஈαʔϏε wίϯςφʹ͸ɺىಈΠϕϯτΛड͚औΔલஈαʔϏε͕͋Δ w'BTU$POUBJOFSͷOHY@NSVCZɺSVODʹର͢ΔDPOUBJOFSEɺͳͲ /HJOY͸Πϯλʔωοτʹެ։͞ΕΔ ݖݶ΁ͷߟྀ͕ඞཁ ͨͩ͠ɺݖݶ੍ޚ͸ೝূͳͲͰߦ͑Δ

  27. 27.

    ίϯςφͷલஈϓϩάϥϜͱൺֱ͢Δ wલஈΛOHY@NSVCZͱͨ͠'BTU$POUBJOFSΞʔΩςΫνϟ OHY@NSVCZ VTFSOHJOY ίϯςφ VTFSVTFS ίϯςφ VTFSVTFS IBDPOJXBίϚϯυ IPTUGPPFYBNQMFKQ

    IPTUCBSFYBNQMFKQ ίϯςφϛυϧઃఆ౳ )PTUϔομͳͲ͔Β ίϯςφͷ৘ใΛ࡞੒ TFUVJESPPU ͍ͨ͠ͷͰ ରԠ͕ඞཁ 6TFS/BNFTQBDFʹΑΓ ίϯςφ಺Ͱ͸SPPU ݖݶ෼཭ ݖݶ෼཭
  28. 28.

    TV&9&$ηΩϡϦςΟϞσϧͷৄࡉ wಛ௃ͱͯ͠͸ ඞཁҎ্ͷݖݶɾࢀরΛ༩͑ͳ͍ 6/*9Ϣʔβϕʔε ن໿ʹΑΔ୲อ ෆਖ਼ͳ*%ͳͲ͸ݫ͘͠ݕࠪ

  29. 29.

    ίϯςφͷىಈϓϩηεʹରԠ͢Δ TV&9&$ͷ༻ޠ ίϯςφͰͷରԠ XSBQQFS ίϯςφϥϯλΠϜ XSBQQFSͷ࣮ߦϢʔβ ίϯςφϥϯλΠϜͷલஈαʔϏε ର৅ͷ$(*౳ ίϯςφͷ1*%ϓϩηε ʢJOJUͱݺͿʣ

    ର৅ͱͳΔϢʔβ*% ίϯςφͷJOJU࣮ߦϢʔβ υΩϡϝϯτσΟϨΫτϦ SPPUT
  30. 30.

    ݩͷ෼ྨΛύλʔϯʹ੔ཧ wόϦσʔγϣϯͱͯ͠બ୒తʹॲཧ͢΂͖΋ͷ ઃఆͱόΠφϦͷΦ΢φʔҰகɺSPPUGTͷҐஔɺJOJUΛ࣮ߦ͢ΔϢʔβ*%ʹؔ ͢Δ੍ݶɺ؀ڥม਺ͷݕࠪͳͲΛߦ͏ʢϧʔϧʣ wΤϥʔͱͯ͠ॲཧ͢΂͖΋ͷ *%ͷଘࡏ֬ೝͳͲக໋తͳ΋ͷ͸ඞͣݕࠪ͢Δʢϧʔϧʣ wίϯςφͷӡ༻ͷੑ্࣭ɺ࣮૷͢΂͖͔Ͳ͏͔ݕ౼͕ඞཁͳ΋ͷ ίϯςφͷػೳͱ୯७ͳରԠؔ܎ʹͳ͍ɾ୯७ରԠΛ͢Δͱӡ༻ͷ໰୊͕ى ͖ͦ͏ͳ΋ͷ͸ࠓճอཹ͢Δʢϧʔϧʣ

  31. 31.

    ࣮૷ͷৄࡉͳํ਑ͳͲิҨ wʮΤϥʔͱͯ͠ॲཧ͢΂͖΋ͷʯͱͨ͠ϧʔϧ͸ద੾ͳΤϥʔϝο ηʔδΛग़͢Α͏ʹ͢Δ wબ୒తʹॲཧ͢΂͖΋ͷʹ͍ͭͯ͸ɺϏϧυ࣌ΦϓγϣϯͰͲͷݕࠪ Λ࣮ࢪ͢Δ͔ΛࢦఆՄೳͱ͢ΔɻΦϓγϣϯ͕ଟ͍΄ͲηΩϡΞ͕ͩ ࡞੒Ͱ͖Δίϯςφʹ੍ݶ͕͋Δɻগͳ͍ͱٯͷੑ࣭ͱͳΔɻ wϏϧυ࣌Φϓγϣϯʹͨ͠ͷ͸ɺ֎෦ͷઃఆͰ͸ڍಈΛม͑ͳ͍όΠ φϦࣗମͷΦϓγϣϯͱ͠ɺ߈ܸͷػձΛݮΒ͢ͱ͍͏ҙਤ

  32. 32.

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  33. 33.

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  34. 34.

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  35. 35.

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  36. 36.

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  37. 37.

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