Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Many suspicious subjectaccessreview requests #12

Open
paraddise opened this issue Jan 15, 2025 · 0 comments
Open

Many suspicious subjectaccessreview requests #12

paraddise opened this issue Jan 15, 2025 · 0 comments

Comments

@paraddise
Copy link

Logs

I0115 13:55:33.961285       1 handler.go:286] Adding GroupVersion acme.cloud.yandex.com v1alpha1 to ResourceManager
I0115 13:55:34.025140       1 requestheader_controller.go:169] Starting RequestHeaderAuthRequestController
I0115 13:55:34.025186       1 shared_informer.go:313] Waiting for caches to sync for RequestHeaderAuthRequestController
I0115 13:55:34.025257       1 configmap_cafile_content.go:202] "Starting controller" name="client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file"
I0115 13:55:34.025279       1 shared_informer.go:313] Waiting for caches to sync for client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
I0115 13:55:34.025268       1 configmap_cafile_content.go:202] "Starting controller" name="client-ca::kube-system::extension-apiserver-authentication::client-ca-file"
I0115 13:55:34.025349       1 shared_informer.go:313] Waiting for caches to sync for client-ca::kube-system::extension-apiserver-authentication::client-ca-file
I0115 13:55:34.031898       1 secure_serving.go:213] Serving securely on :8443
I0115 13:55:34.032075       1 dynamic_serving_content.go:132] "Starting controller" name="serving-cert::/tls/tls.crt::/tls/tls.key"
I0115 13:55:34.032261       1 tlsconfig.go:240] "Starting DynamicServingCertificateController"
I0115 13:55:34.128202       1 shared_informer.go:320] Caches are synced for client-ca::kube-system::extension-apiserver-authentication::client-ca-file
I0115 13:55:34.130405       1 shared_informer.go:320] Caches are synced for RequestHeaderAuthRequestController
I0115 13:55:34.130525       1 shared_informer.go:320] Caches are synced for client-ca::kube-system::extension-apiserver-authentication::requestheader-client-ca-file
E0115 14:03:36.365796       1 webhook.go:275] Failed to make webhook authorizer request: Post "https://10.96.0.1:443/apis/authorization.k8s.io/v1/subjectaccessreviews?timeout=10s": context canceled
E0115 14:03:36.366090       1 errors.go:77] Post "https://10.96.0.1:443/apis/authorization.k8s.io/v1/subjectaccessreviews?timeout=10s": context canceled
E0115 14:03:36.366187       1 timeout.go:142] post-timeout activity - time-elapsed: 10.1µs, GET "/apis/acme.cloud.yandex.com/v1alpha1" result: <nil>
E0115 14:04:03.440870       1 webhook.go:275] Failed to make webhook authorizer request: Post "https://10.96.0.1:443/apis/authorization.k8s.io/v1/subjectaccessreviews?timeout=10s": context canceled
E0115 14:04:03.440972       1 errors.go:77] Post "https://10.96.0.1:443/apis/authorization.k8s.io/v1/subjectaccessreviews?timeout=10s": context canceled
E0115 14:04:03.441047       1 timeout.go:142] post-timeout activity - time-elapsed: 312.1µs, GET "/apis/acme.cloud.yandex.com/v1alpha1" result: <nil>

Audit logs from control plane

{
   "kind":"Event",
   "apiVersion":"audit.k8s.io/v1",
   "level":"RequestResponse",
   "auditID":"0ba2c8c4-eed1-4fac-b48a-e784614704cb",
   "stage":"ResponseComplete",
   "requestURI":"/apis/authorization.k8s.io/v1/subjectaccessreviews?timeout=10s",
   "verb":"create",
   "user":{
      "username":"system:serviceaccount:infra-cert-manager:cert-manager-webhook-yandex-yc",
      "uid":"b5eccfbc-5776-4580-bde1-2dc77bd3e344",
      "groups":[
         "system:serviceaccounts",
         "system:serviceaccounts:infra-cert-manager",
         "system:authenticated"
      ],
      "extra":{
         "authentication.kubernetes.io/credential-id":[
            "JTI=c0617a9b-811b-4775-aaec-c16d2e00b82f"
         ],
         "authentication.kubernetes.io/node-name":[
            "k8s-node-15"
         ],
         "authentication.kubernetes.io/node-uid":[
            "dc06ae8c-58f7-44b9-b18c-83ed2bfd75be"
         ],
         "authentication.kubernetes.io/pod-name":[
            "cert-manager-webhook-yandex-yc-6459545fd4-x2t8t"
         ],
         "authentication.kubernetes.io/pod-uid":[
            "7c8591b7-ec75-40a8-8cac-c6b2812bb564"
         ]
      }
   },
   "sourceIPs":[
      "10.0.30.75"
   ],
   "userAgent":"webhook/v0.0.0 (linux/amd64) kubernetes/$Format",
   "objectRef":{
      "resource":"subjectaccessreviews",
      "apiGroup":"authorization.k8s.io",
      "apiVersion":"v1"
   },
   "responseStatus":{
      "metadata":{
         
      },
      "code":201
   },
   "requestObject":{
      "kind":"SubjectAccessReview",
      "apiVersion":"authorization.k8s.io/v1",
      "metadata":{
         "creationTimestamp":null
      },
      "spec":{
         "nonResourceAttributes":{
            "path":"/apis/acme.cloud.yandex.com/v1alpha1",
            "verb":"get"
         },
         "user":"system:serviceaccount:kyverno:kyverno-admission-controller",
         "groups":[
            "system:serviceaccounts",
            "system:serviceaccounts:kyverno",
            "system:authenticated"
         ],
         "extra":{
            "authentication.kubernetes.io/credential-id":[
               "JTI=bacbc95e-f63d-4c48-bdc2-b49a4b9cd73b"
            ],
            "authentication.kubernetes.io/node-name":[
               "k8s-node-14"
            ],
            "authentication.kubernetes.io/node-uid":[
               "47b8a1bf-8361-4099-95d0-273876c6d722"
            ],
            "authentication.kubernetes.io/pod-name":[
               "kyverno-admission-controller-5d4b6b9685-b6kl8"
            ],
            "authentication.kubernetes.io/pod-uid":[
               "23f2a75f-6922-4f2e-874a-cb1014829d2a"
            ]
         }
      },
      "status":{
         "allowed":false
      }
   },
   "responseObject":{
      "kind":"SubjectAccessReview",
      "apiVersion":"authorization.k8s.io/v1",
      "metadata":{
         "creationTimestamp":null,
         "managedFields":[
            {
               "manager":"webhook",
               "operation":"Update",
               "apiVersion":"authorization.k8s.io/v1",
               "time":"2025-01-15T13:18:36Z",
               "fieldsType":"FieldsV1",
               "fieldsV1":{
                  "f:spec":{
                     "f:extra":{
                        ".":{
                           
                        },
                        "f:authentication.kubernetes.io/credential-id":{
                           
                        },
                        "f:authentication.kubernetes.io/node-name":{
                           
                        },
                        "f:authentication.kubernetes.io/node-uid":{
                           
                        },
                        "f:authentication.kubernetes.io/pod-name":{
                           
                        },
                        "f:authentication.kubernetes.io/pod-uid":{
                           
                        }
                     },
                     "f:groups":{
                        
                     },
                     "f:nonResourceAttributes":{
                        ".":{
                           
                        },
                        "f:path":{
                           
                        },
                        "f:verb":{
                           
                        }
                     },
                     "f:user":{
                        
                     }
                  }
               }
            }
         ]
      },
      "spec":{
         "nonResourceAttributes":{
            "path":"/apis/acme.cloud.yandex.com/v1alpha1",
            "verb":"get"
         },
         "user":"system:serviceaccount:kyverno:kyverno-admission-controller",
         "groups":[
            "system:serviceaccounts",
            "system:serviceaccounts:kyverno",
            "system:authenticated"
         ],
         "extra":{
            "authentication.kubernetes.io/credential-id":[
               "JTI=bacbc95e-f63d-4c48-bdc2-b49a4b9cd73b"
            ],
            "authentication.kubernetes.io/node-name":[
               "k8s-node-14"
            ],
            "authentication.kubernetes.io/node-uid":[
               "47b8a1bf-8361-4099-95d0-273876c6d722"
            ],
            "authentication.kubernetes.io/pod-name":[
               "kyverno-admission-controller-5d4b6b9685-b6kl8"
            ],
            "authentication.kubernetes.io/pod-uid":[
               "23f2a75f-6922-4f2e-874a-cb1014829d2a"
            ]
         }
      },
      "status":{
         "allowed":true,
         "reason":"RBAC: allowed by ClusterRoleBinding \"system:discovery\" of ClusterRole \"system:discovery\" to Group \"system:authenticated\""
      }
   },
   "requestReceivedTimestamp":"2025-01-15T13:18:36.031223Z",
   "stageTimestamp":"2025-01-15T13:18:36.034461Z",
   "annotations":{
      "authorization.k8s.io/decision":"allow",
      "authorization.k8s.io/reason":"RBAC: allowed by ClusterRoleBinding \"cert-manager-webhook-yandex-yc:auth-delegator\" of ClusterRole \"system:auth-delegator\" to ServiceAccount \"cert-manager-webhook-yandex-yc/infra-cert-manager\"",
      "mutation.webhook.admission.k8s.io/round_0_index_14":"{\"configuration\":\"kyverno-resource-mutating-webhook-cfg\",\"webhook\":\"mutate.kyverno.svc-fail\",\"mutated\":false}"
   }
}

I don't understand why webhook makes subjectaccessreview review.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
1 participant
@paraddise