Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 1 | local kube = import "kube.libsonnet"; |
| 2 | |
| 3 | { |
| 4 | local policies = self, |
| 5 | |
| 6 | policyNameAllowInsecure: "policy:allow-insecure", |
| 7 | policyNameAllowSecure: "policy:allow-secure", |
Sergiusz Bazanski | e3432ee | 2020-05-11 20:16:44 +0200 | [diff] [blame] | 8 | policyNameAllowMostlySecure: "policy:allow-mostlysecure", |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 9 | |
| 10 | Cluster: { |
Sergiusz Bazanski | e3432ee | 2020-05-11 20:16:44 +0200 | [diff] [blame] | 11 | local cluster = self, |
| 12 | |
| 13 | // Insecure: allowing creation of these pods allows you to pwn the entire cluster. |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 14 | insecure: kube._Object("policy/v1beta1", "PodSecurityPolicy", "insecure") { |
| 15 | spec: { |
| 16 | privileged: true, |
| 17 | allowPrivilegeEscalation: true, |
| 18 | allowedCapabilities: ['*'], |
| 19 | volumes: ['*'], |
| 20 | hostNetwork: true, |
Serge Bazanski | c33ebcc | 2019-11-01 18:43:45 +0100 | [diff] [blame] | 21 | hostPorts: [ |
| 22 | { max: 40000, min: 1 }, |
| 23 | ], |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 24 | hostIPC: true, |
| 25 | hostPID: true, |
| 26 | runAsUser: { |
| 27 | rule: 'RunAsAny', |
| 28 | }, |
| 29 | seLinux: { |
| 30 | rule: 'RunAsAny', |
| 31 | }, |
| 32 | supplementalGroups: { |
| 33 | rule: 'RunAsAny', |
| 34 | }, |
| 35 | fsGroup: { |
| 36 | rule: 'RunAsAny', |
| 37 | }, |
| 38 | }, |
| 39 | }, |
| 40 | insecureRole: kube.ClusterRole(policies.policyNameAllowInsecure) { |
| 41 | rules: [ |
| 42 | { |
| 43 | apiGroups: ['policy'], |
| 44 | resources: ['podsecuritypolicies'], |
| 45 | verbs: ['use'], |
| 46 | resourceNames: ['insecure'], |
| 47 | } |
| 48 | ], |
| 49 | }, |
Sergiusz Bazanski | e3432ee | 2020-05-11 20:16:44 +0200 | [diff] [blame] | 50 | |
| 51 | // Secure: very limited subset of security policy, everyone is allowed |
| 52 | // to spawn containers of this kind. |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 53 | secure: kube._Object("policy/v1beta1", "PodSecurityPolicy", "secure") { |
| 54 | spec: { |
| 55 | privileged: false, |
| 56 | # Required to prevent escalations to root. |
| 57 | allowPrivilegeEscalation: false, |
| 58 | # This is redundant with non-root + disallow privilege escalation, |
| 59 | # but we can provide it for defense in depth. |
| 60 | requiredDropCapabilities: ["ALL"], |
| 61 | # Allow core volume types. |
| 62 | volumes: [ |
| 63 | 'configMap', |
| 64 | 'emptyDir', |
| 65 | 'projected', |
| 66 | 'secret', |
| 67 | 'downwardAPI', |
| 68 | 'persistentVolumeClaim', |
| 69 | ], |
| 70 | hostNetwork: false, |
| 71 | hostIPC: false, |
| 72 | hostPID: false, |
| 73 | runAsUser: { |
| 74 | # Allow to run as root - docker, we trust you here. |
| 75 | rule: 'RunAsAny', |
| 76 | }, |
| 77 | seLinux: { |
| 78 | rule: 'RunAsAny', |
| 79 | }, |
| 80 | supplementalGroups: { |
| 81 | rule: 'MustRunAs', |
| 82 | ranges: [ |
| 83 | { |
| 84 | # Forbid adding the root group. |
| 85 | min: 1, |
| 86 | max: 65535, |
| 87 | } |
| 88 | ], |
| 89 | }, |
| 90 | fsGroup: { |
| 91 | rule: 'MustRunAs', |
| 92 | ranges: [ |
| 93 | { |
| 94 | # Forbid adding the root group. |
| 95 | min: 1, |
| 96 | max: 65535, |
| 97 | } |
| 98 | ], |
| 99 | }, |
| 100 | readOnlyRootFilesystem: false, |
| 101 | }, |
| 102 | }, |
| 103 | secureRole: kube.ClusterRole(policies.policyNameAllowSecure) { |
| 104 | rules: [ |
| 105 | { |
| 106 | apiGroups: ['policy'], |
| 107 | resources: ['podsecuritypolicies'], |
| 108 | verbs: ['use'], |
| 109 | resourceNames: ['secure'], |
| 110 | }, |
| 111 | ], |
| 112 | }, |
Sergiusz Bazanski | e3432ee | 2020-05-11 20:16:44 +0200 | [diff] [blame] | 113 | |
| 114 | // MostlySecure: like secure, but allows for setuid inside containers. |
| 115 | mostlySecure: cluster.secure { |
| 116 | metadata+: { |
| 117 | name: "mostlysecure", |
| 118 | }, |
| 119 | spec+: { |
| 120 | allowPrivilegeEscalation: true, |
| 121 | }, |
| 122 | }, |
| 123 | mostlySecureRole: kube.ClusterRole(policies.policyNameAllowMostlySecure) { |
| 124 | rules: [ |
| 125 | { |
| 126 | apiGroups: ['policy'], |
| 127 | resources: ['podsecuritypolicies'], |
| 128 | verbs: ['use'], |
| 129 | resourceNames: ['mostlysecure'], |
| 130 | }, |
| 131 | ], |
| 132 | }, |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 133 | }, |
| 134 | |
| 135 | # Allow insecure access to all service accounts in a given namespace. |
| 136 | AllowNamespaceInsecure(namespace): { |
| 137 | rb: kube.RoleBinding("policy:allow-insecure-in-" + namespace) { |
| 138 | metadata+: { |
| 139 | namespace: namespace, |
| 140 | }, |
| 141 | roleRef_: policies.Cluster.insecureRole, |
| 142 | subjects: [ |
| 143 | { |
| 144 | kind: "Group", |
| 145 | apiGroup: "rbac.authorization.k8s.io", |
| 146 | name: "system:serviceaccounts", |
| 147 | } |
| 148 | ], |
| 149 | }, |
| 150 | }, |
Sergiusz Bazanski | e3432ee | 2020-05-11 20:16:44 +0200 | [diff] [blame] | 151 | |
| 152 | # Allow mostlysecure access to all service accounts in a given namespace. |
| 153 | AllowNamespaceMostlySecure(namespace): { |
| 154 | rb: kube.RoleBinding("policy:allow-mostlysecure-in-" + namespace) { |
| 155 | metadata+: { |
| 156 | namespace: namespace, |
| 157 | }, |
| 158 | roleRef_: policies.Cluster.mostlySecureRole, |
| 159 | subjects: [ |
| 160 | { |
| 161 | kind: "Group", |
| 162 | apiGroup: "rbac.authorization.k8s.io", |
| 163 | name: "system:serviceaccounts", |
| 164 | } |
| 165 | ], |
| 166 | }, |
| 167 | }, |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 168 | } |