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Cribl-based findings/remediations (#45)
- add security groups and ports file for additional sg - add roles/policies.tf - refactor roles/policies.tf into cluster-admin and cluster-role -
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| #--- | ||
| # cluster-admin | ||
| #--- | ||
| locals { | ||
| iam_arn = format("arn:%v:iam::%v:%%v", data.aws_arn.current.partition, data.aws_caller_identity.current.account_id) | ||
| common_arn = format("arn:%v:%%v:%v:%v:%%v", data.aws_arn.current.partition, data.aws_region.current.name, data.aws_caller_identity.current.account_id) | ||
| eks_resources = ["cluster", "addon", "nodegroup", "identityproviderconfig"] | ||
|
|
||
| admin_policy_statements = { | ||
| ECRRead = { | ||
| actions = [ | ||
| "ecr:Describe*", | ||
| "ecr:Get*", | ||
| "ecr:ListImages", | ||
| "ecr:BatchGetImage", | ||
| "ecr:BatchCheckLayerAvailability", | ||
| "ecr:GetDownloadUrlForLayer", | ||
| ] | ||
| resources = ["*"] | ||
| } | ||
| ECRWrite = { | ||
| actions = [ | ||
| "ecr:BatchDeleteImage", | ||
| "ecr:CompleteLayerUpload", | ||
| "ecr:CreateRepository", | ||
| "ecr:DeleteRepository", | ||
| "ecr:InitiateLayerUpload", | ||
| "ecr:PutImage", | ||
| "ecr:UploadLayerPart" | ||
| ] | ||
| resources = [format(local.common_arn, "ecr", format("repository/eks/%v/*", var.cluster_name))] | ||
| } | ||
| EKSRead = { | ||
| actions = [ | ||
| "eks:ListClusters", | ||
| "eks:ListAddons", | ||
| "eks:ListNodegroups", | ||
| "eks:DescribeCluster", | ||
| "eks:DescribeAddon*", | ||
| "eks:DescribeNodegroup", | ||
| ] | ||
| resources = [ | ||
| format(local.common_arn, "eks", "cluster/*"), | ||
| format(local.common_arn, "eks", "addon/*"), | ||
| format(local.common_arn, "eks", "addons/*"), | ||
| format(local.common_arn, "eks", "/addons/*"), | ||
| format(local.common_arn, "eks", "nodegroup/*"), | ||
| ] | ||
| } | ||
| IAMRead = { | ||
| actions = [ | ||
| "iam:ListRoles", | ||
| ] | ||
| resources = ["*"] | ||
| } | ||
| SSMGet = { | ||
| actions = [ | ||
| "ssm:GetParameter", | ||
| ] | ||
| resources = [ | ||
| format("arn:%v:%v:%v:%v:%v", data.aws_arn.current.partition, "ssm", data.aws_region.current.name, "", "parameter/aws/service/eks/*") | ||
| ] | ||
| } | ||
| EKSReadMyClusters = { | ||
| actions = [ | ||
| "eks:List*", | ||
| "eks:Read*", | ||
| "eks:Describe*", | ||
| "eks:AccessKubernetesApi", | ||
| ] | ||
| resources = flatten(concat( | ||
| [format(local.common_arn, "eks", format("/clusters/%v/addons", var.cluster_name))], | ||
| [for r in local.eks_resources : [format(local.common_arn, "eks", format("%v/%v", r, var.cluster_name)), | ||
| format(local.common_arn, "eks", format("%v/%v/*", r, var.cluster_name))]] | ||
| )) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| resource "aws_iam_role" "role_cluster-admin" { | ||
| name = format("%v%v-cluster-admin", local.prefixes["eks"], var.cluster_name) | ||
| description = "SAML EKS Cluster Admin Role for ${var.cluster_name}" | ||
|
|
||
| assume_role_policy = data.aws_iam_policy_document.allow_sts.json | ||
| force_detach_policies = true | ||
| tags = var.tags | ||
| } | ||
|
|
||
| resource "aws_iam_policy_attachment" "cluster-admin-attach" { | ||
| name = format("%v%v-cluster-admin-attach", local.prefixes["eks"], var.cluster_name) | ||
| policy_arn = aws_iam_policy.cluster-admin-policy.arn | ||
| roles = [aws_iam_role.role_cluster-admin.name] | ||
| } | ||
|
|
||
| #--- | ||
| # cluster admin policy | ||
| #--- | ||
| resource "aws_iam_policy" "cluster-admin-policy" { | ||
| name = format("%v%v-cluster-admin", local.prefixes["eks-policy"], var.cluster_name) | ||
| path = "/" | ||
| description = "Allow for administration of the cluster ${var.cluster_name} using AWS resources" | ||
| policy = data.aws_iam_policy_document.cluster-admin-policy.json | ||
|
|
||
| tags = merge( | ||
| local.base_tags, | ||
| var.tags | ||
| ) | ||
| } | ||
|
|
||
| data "aws_iam_policy_document" "cluster-admin-policy" { | ||
| dynamic "statement" { | ||
| for_each = local.admin_policy_statements | ||
| iterator = s | ||
| content { | ||
| sid = format("%v%vAccess", lookup(s.value, "effect", "Allow"), s.key) | ||
| effect = lookup(s.value, "effect", "Allow") | ||
| actions = lookup(s.value, "actions", []) | ||
| resources = lookup(s.value, "resources", []) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #--- | ||
| # cluster admin assume policy | ||
| #--- | ||
| data "aws_iam_policy_document" "allow_sts" { | ||
| statement { | ||
| sid = "AllowSTSAssume" | ||
| effect = "Allow" | ||
| actions = ["sts:AssumeRole"] | ||
| principals { | ||
| type = "AWS" | ||
| identifiers = [ | ||
| format(local.iam_arn, "root"), | ||
| ] | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| #--- | ||
| # cluster | ||
| #--- | ||
| locals { | ||
| cluster_managed_policy_list = [ | ||
| "AmazonEKSClusterPolicy", | ||
| "AmazonEC2FullAccess", | ||
| "CloudWatchLogsFullAccess", | ||
| ] | ||
| cluster_managed_policies = [for p in data.aws_iam_policy.cluster_managed_policies : p.arn] | ||
| } | ||
|
|
||
| data "aws_iam_policy" "cluster_managed_policies" { | ||
| for_each = toset(local.cluster_managed_policy_list) | ||
| name = each.key | ||
| } | ||
|
|
||
| resource "aws_iam_policy" "nlb-policy" { | ||
| name = format("%v%v-nlb", local.prefixes["eks-policy"], var.cluster_name) | ||
| path = "/" | ||
| description = "Allow configuration of the ELB" | ||
| policy = data.aws_iam_policy_document.nlb-policy.json | ||
|
|
||
| } | ||
|
|
||
| # Q: why CreateSecurityGroup | ||
| # TBD: refine resources to limit only to eks configurations | ||
| data "aws_iam_policy_document" "nlb-policy" { | ||
| statement { | ||
| sid = "EKSNLBConfiguration" | ||
| effect = "Allow" | ||
| actions = [ | ||
| "elasticloadbalancing:*", | ||
| "ec2:CreateSecurityGroup", | ||
| "ec2:Describe*", | ||
| ] | ||
| resources = ["*"] | ||
| } | ||
| } | ||
|
|
||
| resource "aws_iam_policy" "cloudwatch-policy" { | ||
| name = format("%v%v-cloudwatch", local.prefixes["eks-policy"], var.cluster_name) | ||
| path = "/" | ||
| description = "Allow sending metric data to cloudwatch" | ||
| policy = data.aws_iam_policy_document.cloudwatch-policy.json | ||
|
|
||
| } | ||
|
|
||
| # TBD: refine resources to limit only to eks configurations | ||
| data "aws_iam_policy_document" "cloudwatch-policy" { | ||
| statement { | ||
| sid = "EKSCloudwatchMetrics" | ||
| effect = "Allow" | ||
| actions = [ | ||
| "cloudwatch:PutMetricData", | ||
| ] | ||
| resources = ["*"] | ||
| } | ||
| } | ||
|
|
||
| resource "aws_iam_role" "role_eks-cluster" { | ||
| name = format("%v%v-cluster", local.prefixes["eks"], var.cluster_name) | ||
| description = "EKS Cluster Role for ${var.cluster_name}" | ||
| assume_role_policy = data.aws_iam_policy_document.eks_assume.json | ||
| } | ||
|
|
||
| resource "aws_iam_role_policy_attachment" "eks-cluster-nlb" { | ||
| role = aws_iam_role.role_eks-cluster.name | ||
| policy_arn = aws_iam_policy.nlb-policy.arn | ||
| } | ||
| resource "aws_iam_role_policy_attachment" "eks-cluster-cloudwatch" { | ||
| role = aws_iam_role.role_eks-cluster.name | ||
| policy_arn = aws_iam_policy.cloudwatch-policy.arn | ||
| } | ||
| resource "aws_iam_role_policy_attachment" "eks-cluster-managed" { | ||
| for_each = toset(local.cluster_managed_policies) | ||
| role = aws_iam_role.role_eks-cluster.name | ||
| policy_arn = each.key | ||
| } | ||
|
|
||
| data "aws_iam_policy_document" "eks_assume" { | ||
| statement { | ||
| sid = "EKSAssumeRole" | ||
| effect = "Allow" | ||
| actions = ["sts:AssumeRole"] | ||
|
|
||
| principals { | ||
| type = "Service" | ||
| identifiers = ["eks.amazonaws.com"] | ||
| } | ||
| } | ||
| } |
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