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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

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

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KONDO Uchio

May 12, 2018
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  1. 6DIJP,POEP(.01FQBCP *OD 84"ݚڀձ TV&9&$ηΩϡϦςΟϞσϧΛ ϕʔεʹͨ͠ίϯςφىಈ࣌ͷ όϦσʔγϣϯͷఏҊ

  2. ΤϯδχΞ ۙ౻Ӊஐ࿕!VE[VSB ٕज़෦ٕज़ج൫νʔϜ

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

    ఏҊ͢ΔόϦσʔγϣϯػߏʹ͍ͭͯ  ՝୊ɾٞ࿦͍ͨ͜͠ͱ
  4. ίϯςφ؀ڥఏڙͷࡍͷ ηΩϡϦςΟత՝୊

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

    ίϯςφͷىಈ࣌ʹɺαʔϏεఏڙऀ͕ҙਤ͠ͳ͍ίϚϯυɺҾ਺ɺݖ ݶͰͷىಈΛ͞ΕΔ৔߹
  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. 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 $POUBJOFSTUPQSPWJEF ❌ ⭕ ❌
  9. ίϯςφͷ಺෦Λӽݖతʹૢ࡞Ͱ͖Δ wίϯςφ಺෦ͷಛݖΛ༩͍͑ͯͳ͍ͷʹɺϑΝΠϧΛૢ࡞Ͱ͖Δ FUDQBTTXE FUDTIBEPX FUDOHJOYOHJOYDPOG QSPDTZT  WBSSVOEPDLFS  "$POUBJOFS

    ίϯςφ಺ͷ௨ৗϢʔβʔ ·ͨ͸ݖݶ੍ݶ͞ΕͨSPPU ౰વɺෆཁͳϑΝΠϧૢ࡞͸ෆՄ ⚠੬ऑੑͳͲͷར༻Ͱ SPPUʹͳΔ ⚠ઃఆ࿙ΕͳͲͰ ෆཁͳݖݶ͕෇͍ͯݖݶୣऔ ૢ࡞ ૢ࡞ ⚠ݖݶઃఆΛޡͬͯ ෇༩Ϛ΢ϯτ͢Δ͜ͱ΋
  10. ҙਤ͠ͳ͍Φϓγϣϯ౳Ͱίϯςφىಈ wίϯςφͷىಈΛϢʔβͰίϯτϩʔϧͰ͖Δ৔߹͕͋Δ ਖ਼ৗͳઃఆͰىಈ ෆਖ਼ͳઃఆͰىಈɺ ͦͷޙෆਖ਼ͳૢ࡞ ίϯςφͰ͸ͳ͍ ϛυϧͳͲΛ ىಈͤ͞ΒΕΔ ίϯςφىಈͷܖػ ͱͳΔΠϕϯτ

    $*αʔϏε౳ δϣϒ։࢝ 'BTU$POUBJOFS લஈͷΠϕϯτΛड͚औΔ૚ OHY@NSVCZEPDLFSE ίϯςφϥϯλΠϜ ⚠ෆਖ਼ͳύϥϝʔλΛ౉͞ΕΔɺͳͲ
  11. ίϯςφʹ·ͭΘΔ ηΩϡϦςΟػߏͷ੔ཧ

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

    4FSWJDF.FTIJOH ' 3PPUMFTT6OQSJWJMFHFEDPOUBJOFST ( )ZQFSWJTPST
  13. 6TFS/BNFTQBDF wϗετ໊ͳͲͷΑ͏ʹຊདྷ04άϩʔόϧʹଘࡏ͢ΔϦιʔεʹ͍ͭͯ
 04಺෦Ͱ໊લۭؒΛ࡞੒͠ɺ
 ෳ਺Λଘࡏͤ͞࢖͍෼͚Δ
 -JOVY/BNFTQBDF  wϢʔβ*%ʹ໊͍ͭͯલۭؒΛ
 ࡞ΓɺϗετͷඇSPPUΛ
 ίϯςφͷ؅ཧऀʹɻ

  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 $BQBCJMJUJFT -JNJUFE SPPU VTSMPDBMCJOTFSWFSGPP Ұ෦ૢ࡞͕Ͱ͖ͳ͍
 SPPU FH࣌ؒૢ࡞͕Ͱ͖ ͳ͍ɺLJMMͰ͖ͳ͍ ҰൠϢʔβ͕ىಈͯ͠΋ ಛݖϙʔτΛϦοεϯͰ͖ΔɺͳͲ Ұ෦Λണୣ Ұ෦Λ ϑΝΠϧʹ෇༩
  15. TFDDPNQ.BOEBUPSZ"DDFTT$POUSPM wϢʔβͷࠓͷݖݶʹ͔͔ΘΒͣɺҰ෦ૢ࡞Λ੍ݶɾ؂ࠪ͢Δ wTFDDPNQͰ͋Ε͹γεςϜίʔϧɺ."$Ͱ͋Ε͹ϑΝΠϧΞΫηεͳͲ SPPU TFDDPNQͷίϯςΫετ "QQ"SNPSͷϓϩϑΝΠϧ SPPUͷ࡞੒ͨ͠ϓϩηε SPPUͷ࡞੒ͨ͠ϓϩηε ,FSOFM04 γεςϜίʔϧݺग़

    ϑΝΠϧΞΫηεɺ ιέοτར༻ͳͲ ❌ ❌ ⭕ ⭕
  16. 4FSWJDF.FTIJOH wίϯςφಉ࢜ͷ૬ޓͷωοτϫʔΫɺૄ௨ΛɺίʔυͳͲʹΑΓίϯτϩʔϧ ͢Δ͜ͱΛ4FSWJDF.FTIͱݺͼɺίϯςφͷจ຺Ͱ࢖ΘΕΔ /PEF1PPMෳ਺ͷ෺ཧϗετΛ୯Ұͷϓʔϧͱͯ͠ѻͬͨ΋ͷ 4FSWJDF.FTI $POUSPM1MBOF ίϯςφಉ࢜ͷૄ௨ͷڐՄېࢭ FHηΩϡϦςΟάϧʔϓ  ίϯςφؒͷ௨৴ͷ؂ࠪ

    ௨৴ܦ࿏ͷ҉߸Խ 5-4ଞ  ❌ ⭕ ✈
  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. )ZQFSWJTPS౳ͷར༻ʢ༧ߘͰ͸ະݴٴʣ wίϯςφٕज़ͷηΩϡϦςΟػߏͷଟ͘͸04ͷதͰด͍ͯ͡Δ͕ɺ
 ܰྔͳϋΠύʔόΠβͳͲΛར༻͠ɺͦͷൣғΛ௒͑ͨαϯυϘοΫ εԽΛ࣮ݱ͢Δٕज़͕ݱΕ͍ͯΔ wH7JTPS ͷ3&"%.&ΑΓ IUUQTDMPVEQMBUGPSNHPPHMFCMPHDPN0QFOTPVSDJOHH7JTPSBTBOECPYFEDPOUBJOFSSVOUJNFIUNM

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

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

       TFDDPNQ    .BOEBUPSZ"DDFTT$POUSPM      4FSWJDF.FTI  ඇಛݖίϯςφ  ϋΠύʔόΠβͷར༻   
  21. ՝୊΁ͷରԠ͸ݶఆత ػೳ໊ ରԠՄೳͳ՝୊ 6TFS/BNFTQBDF      ,FSOFM$BQBCJMJUJFT

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

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

    IPTUCBSFYBNQMFKQ 7JSUVBM)PTU ͝ͱͷઃఆ $(*ͳͲͷ࣮ߦ ͓ޓ͍ʹݖݶ෼཭ γεςϜྖҬ΋ݟ͑ͳ͍ "QBDIFͷઃఆ౳
  25. TV&9&$ηΩϡϦςΟϞσϧ͕ඞཁͳཧ༝ wTFUVTFSJESPPU͞ΕͨόΠφϦΛܦ༝࣮ͯ͠ݱ͍ͯ͠ΔͨΊ "QBDIF VTFSBQBDIF $(*QSPDFTT VTFSVTFS $(*QSPDFTT VTFSVTFS TVFYFDίϚϯυ IPTUGPPFYBNQMFKQ

    IPTUCBSFYBNQMFKQ TFUVJE  ͳͲΛ࣮ߦ͢ΔͨΊɺ TVFYFDίϚϯυ͸TFUVTFSJESPPU ͞ΕͨόΠφϦͱͳ͍ͬͯΔɻ ඞཁҎ্ͷૢ࡞͕Ͱ͖ͳ͍Α͏ͳ Կ͔͠Βରࡦ͕ඞਢ "QBDIFͷઃఆ౳
  26. ίϯςφΠϕϯτΛड͚औΔલஈαʔϏε wίϯςφʹ͸ɺىಈΠϕϯτΛड͚औΔલஈαʔϏε͕͋Δ w'BTU$POUBJOFSͷOHY@NSVCZɺSVODʹର͢ΔDPOUBJOFSEɺͳͲ /HJOY͸Πϯλʔωοτʹެ։͞ΕΔ ݖݶ΁ͷߟྀ͕ඞཁ ͨͩ͠ɺݖݶ੍ޚ͸ೝূͳͲͰߦ͑Δ

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

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

    ର৅ͱͳΔϢʔβ*% ίϯςφͷJOJU࣮ߦϢʔβ υΩϡϝϯτσΟϨΫτϦ SPPUT
  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. ࣮૷ͷৄࡉͳํ਑ͳͲิҨ wʮΤϥʔͱͯ͠ॲཧ͢΂͖΋ͷʯͱͨ͠ϧʔϧ͸ద੾ͳΤϥʔϝο ηʔδΛग़͢Α͏ʹ͢Δ wબ୒తʹॲཧ͢΂͖΋ͷʹ͍ͭͯ͸ɺϏϧυ࣌ΦϓγϣϯͰͲͷݕࠪ Λ࣮ࢪ͢Δ͔ΛࢦఆՄೳͱ͢ΔɻΦϓγϣϯ͕ଟ͍΄ͲηΩϡΞ͕ͩ ࡞੒Ͱ͖Δίϯςφʹ੍ݶ͕͋Δɻগͳ͍ͱٯͷੑ࣭ͱͳΔɻ wϏϧυ࣌Φϓγϣϯʹͨ͠ͷ͸ɺ֎෦ͷઃఆͰ͸ڍಈΛม͑ͳ͍όΠ φϦࣗମͷΦϓγϣϯͱ͠ɺ߈ܸͷػձΛݮΒ͢ͱ͍͏ҙਤ

  32. ۩ମత࣮૷ wචऀͷ։ൃ͢ΔίϯςφϥϯλΠϜ)BDPOJXBͰॱ࣮࣍૷͢Δ༧ఆ wʮίϯςφϥϯλΠϜͷઃఆϑΝΠϧͱɺίϯςφϥϯλΠϜࣗ਎ͷ Φ΢φʔ͕Ұக͢Δ͔ʯͷݕࠪΛ࣮૷ࡁ w)BDPOJXB͸NSVCZͷϏϧυ%4-
 ʢ3VCZ%4-ʣΛར༻Ͱ͖
 ॊೈʹϏϧυΦϓγϣϯઃఆՄೳ

  33. ·ͱΊ wίϯςφΛར༻ͨ͠ϗεςΟϯά؀ڥͷఏڙʹ͓͍ͯɺ͍͔ͭ͘ߟྀ͢΂͖ ηΩϡϦςΟత՝୊͕͋Δɻ wͦͷ͏ͪɺʮఏڙ͢Δίϯςφࣗମͷىಈ࣌ͷηΩϡϦςΟʯʹؔͯ͠͸ɺ ඇಛݖίϯςφ͕༗ޮͰ͋Δ͕ɺͦͷޮՌΛTV&9&$ͷηΩϡϦςΟϞσ ϧΛϕʔεͱͨ͠όϦσʔγϣϯ͕ΑΓߴΊΔͷͰ͸ͳ͍͔ wҰൠͷ8FCαʔόͷϓϩηεىಈͱίϯςφͷىಈͷҧ͍ʹଈͨ͠ରԠ෇ ͚Λ࣮ͯ͠૷ΛਐΊ͍ͨ

  34. ՝୊ɾٞ࿦͍ͨ͠఺

  35. ՝୊ w۩ମత࣮૷΁ͷམͱ͠ࠐΈ ͜Ε͸ॱ࣍࡞͍ͬͯ͘͹͔ΓͰ͋Δ wʮ࣮૷͢΂͖͔Ͳ͏͔ݕ౼͕ඞཁͳ΋ͷʯͷݕ౼ ͦ΋ͦ΋࣮૷͠ͳ͍͍ͯ͘ͷ͔ɺक͍ͬͯΔ΋ͷͷΤοηϯε͸Կ͔ wಋೖޙͷ໰୊఺ɺ༗ޮੑͷݕূ ύϑΥʔϚϯεɺ࣮ࡍʹ߈ܸΛ๷͛Δ͔ɺӡ༻ཁ݅Λຬ͔ͨ͢FUD

  36. ٞ࿦͍ͨ͠ͱ͜Ζ  TV&9&$ϞσϧΛώϯτʹͨ͜͠ΕΒͷݕࠪ͸ຊ౰ʹηΩϡΞʹͳΔͷ͔ʁ " ίϯςφͷىಈͱҰൠͷ8FCαʔόͷϓϩηεىಈΛൺֱ͍ͯ͠Δ͕ɺ ଥ౰ͳͷ͔Ͳ͏͔ # 'BTU$POUBJOFSͷΑ͏ͳ৔߹ͷΈͳͷ͔ɺҰൠʹ༗ޮͳͷ͔  Ұ෦ɺݩͷϞσϧͰͦͷ··ద༻Ͱ͖ͳͦ͏ͳ΋ͷ͕͋Δͱ࿦͕ͨ͡ɺ


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