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

by KONDO Uchio

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

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ΤϯδχΞ ۙ౻Ӊஐ࿕!VE[VSB ٕज़෦ٕज़ج൫νʔϜ

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໨࣍ લఏ ίϯςφ؀ڥఏڙͷࡍͷηΩϡϦςΟత՝୊ લఏ ίϯςφʹ·ͭΘΔηΩϡϦςΟػߏͷ੔ཧ ఏҊ͢ΔόϦσʔγϣϯػߏʹ͍ͭͯ ՝୊ɾٞ࿦͍ͨ͜͠ͱ

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ίϯςφ؀ڥఏڙͷࡍͷ ηΩϡϦςΟత՝୊

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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

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

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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

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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 ❌ ⭕ ❌

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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΋

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ҙਤ͠ͳ͍Φϓγϣϯ౳Ͱίϯςφىಈ wίϯςφͷىಈΛϢʔβͰίϯτϩʔϧͰ͖Δ৔߹͕͋Δ ਖ਼ৗͳઃఆͰىಈ ෆਖ਼ͳઃఆͰىಈɺ ͦͷޙෆਖ਼ͳૢ࡞ ίϯςφͰ͸ͳ͍ ϛυϧͳͲΛ ىಈͤ͞ΒΕΔ ίϯςφىಈͷܖػ ͱͳΔΠϕϯτ $*αʔϏε౳ δϣϒ։࢝ 'BTU$POUBJOFS લஈͷΠϕϯτΛड͚औΔ૚ OHY@NSVCZEPDLFSE ίϯςφϥϯλΠϜ ⚠ෆਖ਼ͳύϥϝʔλΛ౉͞ΕΔɺͳͲ

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ίϯςφʹ·ͭΘΔ ηΩϡϦςΟػߏͷ੔ཧ

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ίϯςφʹؔ͢ΔηΩϡϦςΟػߏ " 6TFS/BNFTQBDF # ,FSOFM$BQBCJMJUJFT $ TFDDPNQ % .BOEBUPSZ"DDFTT$POUSPM & 4FSWJDF.FTIJOH ' 3PPUMFTT6OQSJWJMFHFEDPOUBJOFST ( )ZQFSWJTPST

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

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,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

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

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4FSWJDF.FTIJOH wίϯςφಉ࢜ͷ૬ޓͷωοτϫʔΫɺૄ௨ΛɺίʔυͳͲʹΑΓίϯτϩʔϧ ͢Δ͜ͱΛ4FSWJDF.FTIͱݺͼɺίϯςφͷจ຺Ͱ࢖ΘΕΔ /PEF1PPMෳ਺ͷ෺ཧϗετΛ୯Ұͷϓʔϧͱͯ͠ѻͬͨ΋ͷ 4FSWJDF.FTI $POUSPM1MBOF ίϯςφಉ࢜ͷૄ௨ͷڐՄېࢭ FHηΩϡϦςΟάϧʔϓ ίϯςφؒͷ௨৴ͷ؂ࠪ ௨৴ܦ࿏ͷ҉߸Խ 5-4ଞ ❌ ⭕ ✈

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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

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

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

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

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

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ఏҊ͢Δ όϦσʔγϣϯػߏʹ͍ͭͯ

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

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TV&9&$ηΩϡϦςΟϞσϧͱ͸ w·ͣɺTV&9&$ʹ͍ͭͯ "QBDIF VTFSBQBDIF $(*QSPDFTT VTFSVTFS $(*QSPDFTT VTFSVTFS TVFYFDίϚϯυ IPTUGPPFYBNQMFKQ IPTUCBSFYBNQMFKQ 7JSUVBM)PTU ͝ͱͷઃఆ $(*ͳͲͷ࣮ߦ ͓ޓ͍ʹݖݶ෼཭ γεςϜྖҬ΋ݟ͑ͳ͍ "QBDIFͷઃఆ౳

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TV&9&$ηΩϡϦςΟϞσϧ͕ඞཁͳཧ༝ wTFUVTFSJESPPU͞ΕͨόΠφϦΛܦ༝࣮ͯ͠ݱ͍ͯ͠ΔͨΊ "QBDIF VTFSBQBDIF $(*QSPDFTT VTFSVTFS $(*QSPDFTT VTFSVTFS TVFYFDίϚϯυ IPTUGPPFYBNQMFKQ IPTUCBSFYBNQMFKQ TFUVJE ͳͲΛ࣮ߦ͢ΔͨΊɺ TVFYFDίϚϯυ͸TFUVTFSJESPPU ͞ΕͨόΠφϦͱͳ͍ͬͯΔɻ ඞཁҎ্ͷૢ࡞͕Ͱ͖ͳ͍Α͏ͳ Կ͔͠Βରࡦ͕ඞਢ "QBDIFͷઃఆ౳

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

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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෼཭

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

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

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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

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

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

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

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՝୊ɾٞ࿦͍ͨ͠఺

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

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