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Terraform x OPA/Conftest の tips
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Ryo Kubota
July 07, 2021
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Terraform x OPA/Conftest の tips
OPA/Conftest で Terraform を扱う際の tips のまとめ
Ryo Kubota
July 07, 2021
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Transcript
5FSSBGPSNY01"$POGUFTUͷ UJQT Open Policy Agent Rego Knowledge Sharing Meetup
#2021.07 Ryo Kubota @ryok6t
• Ryo Kubota (@ryok6t) • FiNC Technologies • SRE Team
manager ࣗݾհ
લఏ • ϚΠΫϩαʔϏεΛ AWS EKS ্ʹσϓϩΠ • ֤αʔϏεͷΠϯϑϥҎԼͰίʔυཧ • Kubernetes
ͷ manifest • Terraform • ֤։ൃνʔϜ͕ࣗͰ͜ΕΒͷίʔυΛॻ͍͍ͯΔ • ࣭ͷ୲อͷͨΊʹ Conftest Λར༻
Ҏલͷൃද • https://speakerdeck.com/ryokbt/terraformfalserebiyuwoconftestdezi-dong-hua-suru
ຊͷ༰ • ʢಛʹʣTerraform Ͱ OPA Λ͏߹ͷͪΐͬͱͨ͠ίπ • ͕ࣗ OPA Λಋೖ͢ΔલʹΓ͔ͨͬͨ͜ͱͷ·ͱΊ
·ͣQMBOΛ+40/ʹ • plan ݁ՌΛ JSON ʹ͢Δͱ͜Ζ͔Β • terraform plan -out
plan.tfplan • terraform show -json plan.tfplan | conftest test -
5FSSBGPSNQMBOͷ+40/ ϦιʔεͱͦΕʹର͢ΔมߋҰཡ Ճ͑Δૢ࡞ʢDSFBUF VQEBUFͳͲʣ Ϧιʔεͷใ มߋલมߋޙͷঢ়ଶ
ϙϦγʔΛॻ͘ WJPMBUJPOEFOZXBSOͷQSFpYΛ͚ͭΔ • ʮresource type ͕ security group Ͱɺport ͕
ϑϧΦʔϓϯͳͷ͕1ݸͰ͋Ε violationʯ
ڞ௨ͷॲཧΛ·ͱΊΔ • ڞ௨ͷॲཧΛ͢Δέʔε͕ଟ͍ • e.g. ಛఆͷ resource type ͷ࣌ͷΈద༻͢Δ •
ઌͷྫͩͱɺsecurity group ͷ͚࣌ͩద༻͢ΔͳͲ • ຖճॻ͘ͷ໘
GVODUJPOΛͬͨڞ௨ॲཧ ड͚औͬͨUZQFʹ ͯ·Δͷ͚ͩΛฦ͢
ڞ௨ॲཧΛผͷϑΝΠϧʹΓग़͢ • ڞ௨ॲཧ༻ͷ package Λ࡞͓ͬͯ͘
ڞ௨ॲཧΛผϑΝΠϧ͔Βݺͼग़͢ ڞ௨ॲཧ༻ͷQBDLBHFΛJNQPSU CBTFSFTPVSDFTͰݺͼग़ͤΔΑ͏ʹ
ྫ֎έʔεΛѻ͏ • There is no rule without exceptions • ಛఆͷϦιʔε͚ͩϧʔϧͷର֎ʹ͍ͨ͠έʔε͕ଘࡏ
lFYDFQUJPOzΛͬͯྫ֎ʹରԠ • ྫ֎ͷϩδοΫʹͯ·ͬͨ߹ɺrules Ͱࢦఆͨ͠ ͷແࢹ͞ΕΔ • ҎԼͰ “deny_foo”, “violation_foo” ͳͲ͕ແࢹ͞ΕΔ
ςετΛॻ͘ • Rego ͷจ๏ʹΫη͕͋ΔͨΊɺςετ͕ॏཁ • Conftest ࣗମͰ؆୯ʹςετ͕Մೳ
ςετͷํ๏ • foo.rego ʹରͯ͠ɺfoo_test.rego ͱ͍͏ϑΝΠϧΛ༻ҙ • conftest verify Λ࣮ߦ
ςετͷྫʢWJPMBUJPOʹͳΔέʔεʣ ϑϧΦʔϓϯʹͳ͍ͬͯΔͷͰ WJPMBUJPOʹͳΔ͜ͱΛςετ
ςετίʔυͷߏ QMBOͷ+40/ͱಉ͡ߏͰ ςετσʔλΛੜ XJUIBTΛͬͯ ςετσʔλΛ༩͑Δ
ςετͷྫ WJPMBUJPOʹͳΒͳ͍έʔε
ςετͷྫ WJPMBUJPOʹͳΒͳ͍έʔε • not Λ͚ͭΔ͚ͩ
ςετσʔλʹ͍ͭͯ • ެࣜυΩϡϝϯτͰɺςετίʔυʹ JSON Λ ॻ͍͍ͯΔ • Ҿ༻: https://www.openpolicyagent.org/docs/latest/policy-testing/
ςετσʔλʹ͍ͭͯ • ͔͠͠ JSON Λॻ͘ͱਏ͍έʔε͕ଟ͍ • ݱࡏ yaml Ͱॻ͍ͯ yaml.unmarshal
͍ͯ͠Δ
࠷ޙʹσόοάʹ͍ͭͯ • policy ͦͷςετΛॻ͍͍ͯΔͱσόοά͕ͨ͘͠ͳΔ • ҙͷՕॴʹ trace(string) ΛࠐΉ͜ͱͰσόοάग़ྗ ͕Մೳ •
`—trace` Φϓγϣϯ͖Ͱ Conftest Λ࣮ߦ