{"id":50171,"date":"2022-05-10T09:00:53","date_gmt":"2022-05-10T00:00:53","guid":{"rendered":"https:\/\/www.creationline.com\/?p=50171"},"modified":"2022-04-25T13:21:07","modified_gmt":"2022-04-25T04:21:07","slug":"kubernetes-rbac%ef%bc%9acsr%e3%81%ab%e3%82%88%e3%82%8b%e6%a8%a9%e9%99%90%e6%98%87%e6%a0%bc%e3%82%92%e5%9b%9e%e9%81%bf%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95-aqua-%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa","status":"publish","type":"post","link":"https:\/\/www.creationline.com\/tech-blog\/cloudnative\/aquasecurity\/50171","title":{"rendered":"Kubernetes RBAC\uff1aCSR\u306b\u3088\u308b\u6a29\u9650\u6607\u683c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5 #aqua #\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3 #k8s #rbac"},"content":{"rendered":"<p>\u672c\u30d6\u30ed\u30b0\u306f\u300cAqua Security\u300d\u793e\u306e\u6280\u8853\u30d6\u30ed\u30b0\u30672022\u5e744\u67086\u65e5\u306b\u516c\u958b\u3055\u308c\u305f\u300c<a href=\"https:\/\/blog.aquasec.com\/kubernetes-rbac-privilige-escalation\" rel=\"nofollow noopener noreferrer\" target=\"_blank\"> Kubernetes RBAC: How to Avoid Privilege Escalation via Certificate Signing <\/a>\u300d\u306e\u65e5\u672c\u8a9e\u7ffb\u8a33\u3067\u3059\u3002<\/p>\n<p><center><img loading=\"lazy\" decoding=\"async\" src=\"\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2022\/04\/9b298d18257ded62c753012a420a78c5.png\" alt=\"\" width=\"865\" height=\"420\" class=\"alignnone size-full wp-image-50172\" srcset=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2022\/04\/9b298d18257ded62c753012a420a78c5.png 865w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2022\/04\/9b298d18257ded62c753012a420a78c5-360x175.png 360w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2022\/04\/9b298d18257ded62c753012a420a78c5-768x373.png 768w\" sizes=\"auto, (max-width: 865px) 100vw, 865px\" \/><\/center><\/p>\n<h2>Kubernetes RBAC\uff1aCSR\u306b\u3088\u308b\u6a29\u9650\u6607\u683c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5<\/h2>\n<hr \/>\n<p>\u524d\u56de\u306e\u8a18\u4e8b<a href=\"\/lab\/aquasecurity\/49553\" rel=\"noopener\" target=\"_blank\">\u300cKubernetes RBAC\u306b\u304a\u3051\u308bNode\/Proxy\u6a29\u9650\u304b\u3089\u306e\u6a29\u9650\u6607\u683c\u300d<\/a>\u306b\u7d9a\u304d\u3001\u4eca\u56de\u306f Kubernetes \u306e CSR(Certificate Signing Request) API \u306e\u6a29\u9650\u3092\u6301\u3064\u30e6\u30fc\u30b6\u304c\u3001\u305d\u308c\u3092\u4f7f\u3063\u3066\u30af\u30e9\u30b9\u30bf\u30fc\u5185\u3067\u6a29\u9650\u3092\u6607\u683c\u3059\u308b\u53ef\u80fd\u6027\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u6ce8\u610f\u3059\u3079\u304d\u6f5c\u5728\u7684\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u3068\u3068\u3082\u306b\u3001\u3053\u306e Kubernetes \u306e\u6a5f\u80fd\u304c\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u306e\u304b\u3092\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h3>CSR API \u306e\u7d39\u4ecb<\/h3>\n<p>Kubernetes \u306f\u3001kubelet \u3068 API \u30b5\u30fc\u30d0\u9593\u306e\u901a\u4fe1\u306a\u3069\u3001\u3044\u304f\u3064\u304b\u306e\u5834\u6240\u3067\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u8a3c\u660e\u66f8\u8a8d\u8a3c\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u65b0\u3057\u3044\u8a3c\u660e\u66f8\u3092\u767a\u884c\u3057\u3066\u7f72\u540d\u3059\u308b\u4f55\u3089\u304b\u306e\u65b9\u6cd5\u304c\u5fc5\u8981\u3067\u3059\u3002\u305d\u3053\u3067\u767b\u5834\u3059\u308b\u306e\u304c CSR API \u3067\u3059\u3002<\/p>\n<p>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u8a3c\u660e\u66f8\u8a8d\u8a3c\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u751f\u6210\u3055\u308c\u305f\u8a3c\u660e\u66f8\u304c\u4fe1\u983c\u3067\u304d\u308b\u8a8d\u8a3c\u5c40\u306b\u3088\u3063\u3066\u7f72\u540d\u3055\u308c\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u3042\u306a\u305f\u304c\u30a2\u30af\u30bb\u30b9\u3059\u308b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u8a3c\u660e\u66f8\u3092\u898b\u308b\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u306b\u7d44\u307f\u8fbc\u307e\u308c\u305f\u8a8d\u8a3c\u5c40\u306e\u3044\u305a\u308c\u304b\u306b\u3088\u3063\u3066\u7f72\u540d\u3055\u308c\u3066\u3044\u308b\u306e\u3068\u540c\u3058\u3053\u3068\u3067\u3059\u3002\u3082\u3057\u7f72\u540d\u3055\u308c\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u4fe1\u983c\u3067\u304d\u306a\u3044\u65e8\u306e\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002Kubernetes CSR API \u306f\u3001\u8a8d\u8a3c\u5c40\u306e\u30ad\u30fc\u30d5\u30a1\u30a4\u30eb\u306b\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u7f72\u540d\u304c\u884c\u308f\u308c\u308b\u4ed5\u7d44\u307f\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306b\u3053\u306e API \u3067\u306f\u3001\u9069\u5207\u306a\u30ed\u30fc\u30eb\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9\u5236\u5fa1(RBAC)\u6a29\u9650\u3092\u6301\u3064\u30e6\u30fc\u30b6\u304c CSR \u3092 Kubernetes \u306b\u9001\u4fe1\u3057\u3001\u305d\u3053\u3067\u9069\u5207\u306a\u6a29\u9650\u3092\u6301\u3064\u5225\u306e\u30e6\u30fc\u30b6\u306b\u3088\u3063\u3066\u627f\u8a8d\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e API \u306b\u306f\u3044\u304f\u3064\u304b\u306e<a href=\"https:\/\/kubernetes.io\/docs\/reference\/access-authn-authz\/certificate-signing-requests\/#kubernetes-signers\" rel=\"noopener\" target=\"_blank\">\u7f72\u540d\u8005<\/a>\u304c\u3044\u3066\u3001\u3055\u307e\u3056\u307e\u306a\u76ee\u7684\u306e\u305f\u3081\u306b\u8a3c\u660e\u66f8\u306b\u7f72\u540d\u3067\u304d\u307e\u3059\u3002kubernetes.io\/kube-apiserver-client-kubelet \u306e\u3088\u3046\u306b\u3001Kubernetes \u5185\u90e8\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u4f7f\u7528\u3059\u308b\u8a3c\u660e\u66f8\u3092\u63d0\u4f9b\u3059\u308b\u3082\u306e\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u7f72\u540d\u8005\u306f\u3001\u7f72\u540d\u3059\u308b\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u5185\u5bb9\u304c\u304b\u306a\u308a\u5236\u9650\u3055\u308c\u308b\u50be\u5411\u306b\u3042\u308a\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u89b3\u70b9\u304b\u3089\u306f\u305d\u308c\u307b\u3069\u8208\u5473\u6df1\u3044\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u3053\u3067\u7279\u306b\u6ce8\u76ee\u3057\u305f\u3044\u306e\u306f\u3001kubernetes.io\/kube-apiserver-client \u3068\u3044\u3046\u7f72\u540d\u8005\u3067\u3059\u3002\u3053\u308c\u306f\u3001Kubernetes API \u30b5\u30fc\u30d0\u3078\u306e\u8a8d\u8a3c\u306b\u4f7f\u7528\u3055\u308c\u308b\u8a3c\u660e\u66f8\u3078\u7f72\u540d\u3067\u304d\u3001\u542b\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3082\u306e\u306b\u307b\u3068\u3093\u3069\u5236\u7d04\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3>CSR API\u3092\u5229\u7528\u3057\u305f\u6a29\u9650\u6607\u683c<\/h3>\n<p>\u3067\u306f\u3001CSR \u3092\u4f5c\u6210\u3057\u3001\u8a3c\u660e\u66f8\u3092\u627f\u8a8d\u3059\u308b\u6a29\u9650\u3057\u304b\u6301\u305f\u306a\u3044\u30e6\u30fc\u30b6\u306f\u3001\u30af\u30e9\u30b9\u30bf\u30fc\u5185\u3067\u3069\u306e\u3088\u3046\u306b\u6a29\u9650\u3092\u62e1\u5927\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u653b\u6483\u8005\u304c\u6700\u521d\u306b\u601d\u3044\u3064\u304f\u306e\u306f\u3001system:masters \u30b0\u30eb\u30fc\u30d7\u3067\u65b0\u3057\u3044\u8a3c\u660e\u66f8\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u3053\u308c\u306f\u30cf\u30fc\u30c9\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3055\u308c\u305f\u30af\u30e9\u30b9\u30bf\u30fc\u7ba1\u7406\u8005\u30b0\u30eb\u30fc\u30d7\u3067\u3042\u308a\u3001\u305d\u306e\u6a29\u9650\u306f\u53d6\u308a\u6d88\u3055\u308c\u306a\u3044\u306e\u3067\u3001\u653b\u6483\u8005\u306b\u3068\u3063\u3066\u683c\u597d\u306e\u30bf\u30fc\u30b2\u30c3\u30c8\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001Kubernetes \u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u3053\u306e\u30b0\u30eb\u30fc\u30d7\u3092\u4f7f\u3063\u305f\u8a3c\u660e\u66f8\u306e\u767a\u884c\u306f\u3067\u304d\u306a\u3044\u306f\u305a\u3067\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30bb\u30c3\u30c8\u306b\u306f CertificateSubjectRestriction \u3068\u3044\u3046 AdmissionController \u304c\u3042\u308a\u3001\u305d\u306e\u552f\u4e00\u306e\u76ee\u7684\u306f\u3001<a href=\"https:\/\/kubernetes.io\/docs\/reference\/access-authn-authz\/admission-controllers\/#certificatesubjectrestrictions\" rel=\"noopener\" target=\"_blank\">\u3053\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b<\/a>\u3053\u3068\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f\u72b6\u614b\u3067\u3001\u653b\u6483\u8005\u304c\u53d6\u308b\u3053\u3068\u306e\u3067\u304d\u308b\u4ed6\u306e\u9078\u629e\u80a2\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u30021\u3064\u306e\u826f\u3044\u65b9\u6cd5\u306f\u3001\u30af\u30e9\u30b9\u30bf\u30fc\u3067\u3059\u3067\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u30e6\u30fc\u30b6\u540d\u3092\u8abf\u3079\u3066\u3001\u3069\u308c\u304c\u9ad8\u3044\u30ec\u30d9\u30eb\u306e\u6a29\u9650\u3092\u6301\u3064\u304b\u3092\u78ba\u8a8d\u3057\u3001\u305d\u306e\u3046\u3061\u306e1\u3064\u306b\u4e00\u81f4\u3059\u308b\u65b0\u3057\u3044\u8a3c\u660e\u66f8\u3092\u6d41\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002Kubernetes \u306b\u306f\u3001\u3042\u308b\u30e6\u30fc\u30b6\u306b\u5bfe\u3057\u3066\u3069\u306e\u7279\u5b9a\u306e\u8a3c\u660e\u66f8\u304c\u6709\u52b9\u3067\u3042\u308b\u304b\u3092\u793a\u3059\u4ed5\u7d44\u307f\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3064\u307e\u308a\u3001\u30b7\u30b9\u30c6\u30e0\u30a2\u30ab\u30a6\u30f3\u30c8\u7528\u306e\u65b0\u3057\u3044\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u8a3c\u660e\u66f8\u3092\u4f5c\u6210\u3057\u3001\u305d\u308c\u3092\u4f7f\u3063\u3066\u30af\u30e9\u30b9\u30bf\u30fc\u3092\u8a8d\u8a3c\u3057\u3066\u3082\u3001Kubernetes \u304c\u305d\u306e\u30b7\u30b9\u30c6\u30e0\u30e6\u30fc\u30b6\u306e\u6a29\u9650\u3092\u4e0e\u3048\u308b\u306e\u3067\u3001\u4f55\u306e\u5236\u7d04\u3082\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u30af\u30e9\u30b9\u30bf\u30fc\u306b\u3069\u306e\u30e6\u30fc\u30b6\u3068\u30b0\u30eb\u30fc\u30d7\u304c\u5b58\u5728\u3059\u308b\u304b\u306f\u3001\u4f7f\u7528\u3057\u3066\u3044\u308b\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001kubeadm \u30af\u30e9\u30b9\u30bf\u30fc\u3067\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3092\u898b\u308b\u3068\u3001\u3044\u304f\u3064\u304b\u306e\u53ef\u80fd\u6027\u306e\u9ad8\u3044\u30bf\u30fc\u30b2\u30c3\u30c8\u304c\u898b\u3048\u3066\u304d\u307e\u3059\u3002\u30af\u30e9\u30b9\u30bf\u30fc\u5185\u306e\u30e6\u30fc\u30b6\u306e\u660e\u78ba\u306a\u30ea\u30b9\u30c8\u3092\u5f97\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u304c\u3001\u3053\u306e\u76ee\u7684\u306b\u5fc5\u8981\u306a RBAC \u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u3092\u3059\u3067\u306b\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><center><img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/User-and-Group-listing-image-1.jpg?width=850&name=User-and-Group-listing-image-1.jpg\" alt=\"\" \/><\/center><\/p>\n<p>\u3053\u306e\u30ea\u30b9\u30c8\u3092\u898b\u308b\u3068\u3001system:kube-controller-manager \u304c\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u306a\u308a\u305d\u3046\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u30af\u30e9\u30b9\u30bf\u30fc\u904b\u7528\u306e\u4e2d\u6838\u3068\u306a\u308b Kubernetes Controller Manager \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u4f7f\u7528\u3059\u308b\u30a2\u30ab\u30a6\u30f3\u30c8\u3067\u3042\u308a\u3001\u305d\u308c\u306a\u308a\u306e\u6a29\u9650\u3092\u6301\u3063\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30e6\u30fc\u30b6\u306b\u4e0e\u3048\u3089\u308c\u305f\u6a29\u9650\u3092\u898b\u308b\u3068\u3001secret \u30ea\u30bd\u30fc\u30b9\u306b\u4e0e\u3048\u3089\u308c\u305f\u6a29\u9650\u3092\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><center><img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Privileges-of-the-Kubernetes-controller-manager-image-2.jpg?width=450&name=Privileges-of-the-Kubernetes-controller-manager-image-2.jpg\" alt=\"\" \/><\/center><\/p>\n<p>\u30af\u30e9\u30b9\u30bf\u30fc\u30ec\u30d9\u30eb\u3067 secret \u3092\u53d6\u5f97\u3059\u308b\u6a29\u9650\u3092\u6301\u3064\u3053\u3068\u306f\u3001\u305d\u306e\u74b0\u5883\u3078\u306e\u653b\u6483\u6210\u529f\u306b\u7b49\u3057\u304f\u3001\u305d\u306e\u6a29\u9650\u3092\u6301\u3064\u30e6\u30fc\u30b6\u304c\u653b\u6483\u8005\u306b\u91cd\u8981\u306a\u306e\u306f\u660e\u3089\u304b\u3067\u3059\u3002\u653b\u6483\u8005\u304c\u30af\u30e9\u30b9\u30bf\u30fc\u7ba1\u7406\u8005\u30ec\u30d9\u30eb\u307e\u3067\u305f\u3069\u308a\u7740\u304d\u305f\u3044\u5834\u5408\u3001\u305d\u306e\u6a29\u9650\u3092\u4f7f\u7528\u3057\u3066 clusterrole-aggregation-controller \u306e ServiceAccountToken \u306e secret \u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u7279\u5b9a\u306e ServiceAccount \u306f \"escalate\" \u6a29\u9650\u3092\u6301\u3063\u3066\u304a\u308a\u3001\u3053\u308c\u306b\u3088\u3063\u3066\u8981\u6c42\u306b\u5fdc\u3058\u3066\u81ea\u8eab\u306e\u6a29\u9650\u3092\u52b9\u679c\u7684\u306b cluster-admin \u306b\u307e\u3067\u5f15\u304d\u4e0a\u3052\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><center><img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Escalate-right-available-to-clusterrole-aggregation-controller-image-3.jpg?width=650&name=Escalate-right-available-to-clusterrole-aggregation-controller-image-3.jpg\" alt=\"\" \/><\/center><\/p>\n<h3>CSR API\u306e\u6a29\u9650\u6607\u683c\u306e\u691c\u51fa\u3068\u7de9\u548c\u7b56<\/h3>\n<p>\u3067\u306f\u3001CSR API \u3092\u4ecb\u3057\u305f\u6a29\u9650\u6607\u683c\u304c\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u77e5\u3063\u305f\u4e0a\u3067\u3001\u305d\u308c\u3092\u691c\u77e5\u3057\u7de9\u548c\u3059\u308b\u6700\u5584\u306e\u65b9\u6cd5\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<ul>\n<li>Kubernetes \u306e Audit \u306f\u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u30bf\u30fc\u3067\u6709\u52b9\u306b\u3057\u3001CSR API \u306b\u95a2\u9023\u3059\u308b\u3059\u3079\u3066\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u6ce8\u610f\u6df1\u304f\u76e3\u8996\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30b7\u30b9\u30c6\u30e0\u30b5\u30fc\u30d3\u30b9\u306b\u3088\u308b\u5229\u7528\u304c\u3042\u308b\u30ec\u30d9\u30eb\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u4e88\u671f\u305b\u306c\u8a3c\u660e\u66f8\u304c\u4f5c\u6210\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u306b\u6c17\u3065\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u306f\u305a\u3067\u3059\u3002\u6ce8\u610f\u70b9\u3068\u3057\u3066\u306f\u3001\u653b\u6483\u8005\u304c\u30b7\u30b9\u30c6\u30e0\u30a2\u30ab\u30a6\u30f3\u30c8\u3068\u540c\u3058\u540d\u524d\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u8a3c\u660e\u66f8\u3092\u4f5c\u6210\u3067\u304d\u305f\u5834\u5408\u3001Kubernetes \u306e Audit \u3067\u306f\u8a8d\u8a3c\u5143\u304c\u8a18\u9332\u3055\u308c\u305a\u3001\u30e6\u30fc\u30b6\u540d\u3060\u3051\u304c\u8a18\u9332\u3055\u308c\u308b\u305f\u3081\u3001\u3042\u307e\u308a\u610f\u5473\u306e\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u3053\u3068\u3067\u3059\u3002\n<li>\u3053\u306e API \u306b\u5bfe\u3059\u308b RBAC \u7279\u6a29\u306f\u3001\u30af\u30e9\u30b9\u30bf\u30fc\u306e\u30e6\u30fc\u30b6\u3068\u7ba1\u7406\u8005\u306e\u7279\u6a29\u3001\u304a\u3088\u3073\u30af\u30e9\u30b9\u30bf\u30fc\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2(Operator \u306a\u3069)\u306b\u4e0e\u3048\u3089\u308c\u308b\u6a29\u9650\u3092\u542b\u3081\u3066\u5236\u9650\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30af\u30e9\u30b9\u30bf\u30fc\u5185\u306e CSR \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u7279\u5b9a\u306e\u30a2\u30af\u30bb\u30b9\u3001\u307e\u305f\u306f CSR \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u542b\u3080\u4e00\u822c\u7684\u306a\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9\u30a2\u30af\u30bb\u30b9\u304c\u8981\u6c42\u3055\u308c\u305f\u5834\u5408\u3001\u305d\u308c\u3089\u306e\u6a29\u9650\u304c\u60aa\u7528\u3055\u308c\u308b\u30ea\u30b9\u30af\u3092\u6e1b\u3089\u3059\u305f\u3081\u306b\u3001\u8981\u6c42\u3092\u614e\u91cd\u306b\u30ec\u30d3\u30e5\u30fc\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\n<li>\u3082\u30461\u3064\u306e\u9632\u5fa1\u306e\u5c64\u306f\u3001AdmissionController \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001CSR API \u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981\u306a\u5834\u5408\u3001AdmissionController \u3092\u4f7f\u7528\u3057\u3066\u3001io\/kube-apiserver-client signer \u3092\u4f7f\u7528\u3059\u308b\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u505c\u6b62\u3001system:kube-controller-manager \u306a\u3069\u306e\u30a2\u30ab\u30a6\u30f3\u30c8\u306b\u5bfe\u3059\u308b\u8a3c\u660e\u66f8\u306e\u767a\u884c\u306e\u30d6\u30ed\u30c3\u30af\u304c\u53ef\u80fd\u3067\u3059\u3002\n<\/ul>\n<h2>\u307e\u3068\u3081<\/h2>\n<hr \/>\n<p>\u3053\u308c\u3082 <a href=\"\/lab\/aquasecurity\/49553\" rel=\"noopener\" target=\"_blank\">Kubernetes RBAC<\/a> \u306e\u8907\u96d1\u3055\u3068\u3001Kubernetes \u30af\u30e9\u30b9\u30bf\u30fc\u306b\u304a\u3051\u308b\u904e\u5270\u306a\u6a29\u9650\u4ed8\u4e0e\u306e\u30ea\u30b9\u30af\u3092\u793a\u3059\u4e00\u4f8b\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002Kubernetes \u3092\u74b0\u5883\u306e\u4e00\u90e8\u3068\u3057\u3066\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u6a29\u9650\u3092\u614e\u91cd\u306b\u5236\u5fa1\u3057\u3001\u8ffd\u52a0\u306e\u691c\u51fa\u304a\u3088\u3073\u4e88\u9632\u5236\u5fa1\u3092\u5c0e\u5165\u3057\u3066\u3001Kubernetes API \u3078\u306e\u4e0d\u6b63\u30a2\u30af\u30bb\u30b9\u306b\u3088\u308b\u30ea\u30b9\u30af\u3092\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><center>\n\t\t<!--HubSpot Call-to-Action Code -->\n\t\t<span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-fecc193b-bbc5-40d2-9588-ed7b022af3aa\">\n\t\t<span class=\"hs-cta-node hs-cta-fecc193b-bbc5-40d2-9588-ed7b022af3aa\" id=\"fecc193b-bbc5-40d2-9588-ed7b022af3aa\">\n\t\t<!--[if lte IE 8]>\n\t\t<div id=\"hs-cta-ie-element\"><\/div>\n\t\t<![endif]-->\n\t\t<a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/6168413\/fecc193b-bbc5-40d2-9588-ed7b022af3aa\" >\n\t\t<img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-fecc193b-bbc5-40d2-9588-ed7b022af3aa\" style=\"border-width:0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/6168413\/fecc193b-bbc5-40d2-9588-ed7b022af3aa.png\"  alt=\"New call-to-action\"\/>\n\t\t<\/a>\n\t\t<\/span>\n\t\t<script charset=\"utf-8\" src=\"\/\/js.hubspot.com\/cta\/current.js\"><\/script>\n\t\t<script>\n\t\thbspt.cta.load(6168413, 'fecc193b-bbc5-40d2-9588-ed7b022af3aa', {});\n\t\t<\/script>\n\t\t<\/span>\n\t\t<!-- end HubSpot Call-to-Action Code -->\n\t\t<\/center><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u30d6\u30ed\u30b0\u306f\u300cAqua Security\u300d\u793e\u306e\u6280\u8853\u30d6\u30ed\u30b0\u30672022\u5e744\u67086\u65e5\u306b\u516c\u958b\u3055\u308c\u305f\u300c Kubernetes RBAC: How to Avoid Privilege Escalation via Certificat [&#8230;]<\/p>\n","protected":false},"author":56,"featured_media":50172,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[176,122],"tags":[174,152,123,112,645,358],"class_list":["post-50171","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aquasecurity","category-kubernetes","tag-aqua","tag-aquasecurity","tag-k8s","tag-kubernetes","tag-rbac","tag-358"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Kubernetes RBAC\uff1aCSR\u306b\u3088\u308b\u6a29\u9650\u6607\u683c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5 #aqua #\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3 #k8s #rbac - Tech Blog\uff5c\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3<\/title>\n<meta name=\"description\" content=\"AquaSecurity, Kubernetes |\u672c\u30d6\u30ed\u30b0\u306f\u300cAqua Security\u300d\u793e\u306e\u6280\u8853\u30d6\u30ed\u30b0\u30672022\u5e744\u67086\u65e5\u306b\u516c\u958b\u3055\u308c\u305f\u300c Kubernetes RBAC: How to Avoid\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.creationline.com\/tech-blog\/cloudnative\/aquasecurity\/50171\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kubernetes RBAC\uff1aCSR\u306b\u3088\u308b\u6a29\u9650\u6607\u683c\u3092\u56de\u907f\u3059\u308b\u65b9\u6cd5 #aqua #\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3 #k8s #rbac - Tech Blog\uff5c\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\" \/>\n<meta property=\"og:description\" content=\"AquaSecurity, Kubernetes |\u672c\u30d6\u30ed\u30b0\u306f\u300cAqua Security\u300d\u793e\u306e\u6280\u8853\u30d6\u30ed\u30b0\u30672022\u5e744\u67086\u65e5\u306b\u516c\u958b\u3055\u308c\u305f\u300c Kubernetes RBAC: How to Avoid\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.creationline.com\/tech-blog\/cloudnative\/aquasecurity\/50171\" \/>\n<meta property=\"og:site_name\" content=\"Tech Blog\uff5c\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/creationline\" \/>\n<meta property=\"article:published_time\" content=\"2022-05-10T00:00:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2022\/04\/9b298d18257ded62c753012a420a78c5.png\" \/>\n\t<meta property=\"og:image:width\" content=\"865\" \/>\n\t<meta property=\"og:image:height\" content=\"420\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Kent Magruder\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@creationline\" \/>\n<meta name=\"twitter:site\" content=\"@creationline\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kent Magruder\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.creationline.com\\\/tech-blog\\\/cloudnative\\\/aquasecurity\\\/50171#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.creationline.com\\\/tech-blog\\\/cloudnative\\\/aquasecurity\\\/50171\"},\"author\":{\"name\":\"Kent 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