mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-15 02:40:23 +00:00
141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
/*
|
|
Copyright 2021 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package policy
|
|
|
|
import (
|
|
"strings"
|
|
|
|
corev1 "k8s.io/api/core/v1"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
|
"k8s.io/pod-security-admission/api"
|
|
)
|
|
|
|
/*
|
|
|
|
Sysctls can disable security mechanisms or affect all containers on a host,
|
|
and should be disallowed except for an allowed "safe" subset.
|
|
|
|
A sysctl is considered safe if it is namespaced in the container or the Pod,
|
|
and it is isolated from other Pods or processes on the same Node.
|
|
|
|
**Restricted Fields:**
|
|
spec.securityContext.sysctls[*].name
|
|
|
|
**Allowed Values:**
|
|
'kernel.shm_rmid_forced'
|
|
'net.ipv4.ip_local_port_range'
|
|
'net.ipv4.tcp_syncookies'
|
|
'net.ipv4.ping_group_range'
|
|
'net.ipv4.ip_unprivileged_port_start'
|
|
'net.ipv4.ip_local_reserved_ports'
|
|
'net.ipv4.tcp_keepalive_time'
|
|
'net.ipv4.tcp_fin_timeout'
|
|
'net.ipv4.tcp_keepalive_intvl'
|
|
'net.ipv4.tcp_keepalive_probes'
|
|
|
|
*/
|
|
|
|
func init() {
|
|
addCheck(CheckSysctls)
|
|
}
|
|
|
|
// CheckSysctls returns a baseline level check
|
|
// that limits the value of sysctls in 1.0+
|
|
func CheckSysctls() Check {
|
|
return Check{
|
|
ID: "sysctls",
|
|
Level: api.LevelBaseline,
|
|
Versions: []VersionedCheck{
|
|
{
|
|
MinimumVersion: api.MajorMinorVersion(1, 0),
|
|
CheckPod: sysctlsV1Dot0,
|
|
},
|
|
{
|
|
MinimumVersion: api.MajorMinorVersion(1, 27),
|
|
CheckPod: sysctlsV1Dot27,
|
|
}, {
|
|
MinimumVersion: api.MajorMinorVersion(1, 29),
|
|
CheckPod: sysctlsV1Dot29,
|
|
},
|
|
},
|
|
}
|
|
}
|
|
|
|
var (
|
|
sysctlsAllowedV1Dot0 = sets.NewString(
|
|
"kernel.shm_rmid_forced",
|
|
"net.ipv4.ip_local_port_range",
|
|
"net.ipv4.tcp_syncookies",
|
|
"net.ipv4.ping_group_range",
|
|
"net.ipv4.ip_unprivileged_port_start",
|
|
)
|
|
sysctlsAllowedV1Dot27 = sets.NewString(
|
|
"kernel.shm_rmid_forced",
|
|
"net.ipv4.ip_local_port_range",
|
|
"net.ipv4.tcp_syncookies",
|
|
"net.ipv4.ping_group_range",
|
|
"net.ipv4.ip_unprivileged_port_start",
|
|
"net.ipv4.ip_local_reserved_ports",
|
|
)
|
|
sysctlsAllowedV1Dot29 = sets.NewString(
|
|
"kernel.shm_rmid_forced",
|
|
"net.ipv4.ip_local_port_range",
|
|
"net.ipv4.tcp_syncookies",
|
|
"net.ipv4.ping_group_range",
|
|
"net.ipv4.ip_unprivileged_port_start",
|
|
"net.ipv4.ip_local_reserved_ports",
|
|
"net.ipv4.tcp_keepalive_time",
|
|
"net.ipv4.tcp_fin_timeout",
|
|
"net.ipv4.tcp_keepalive_intvl",
|
|
"net.ipv4.tcp_keepalive_probes",
|
|
)
|
|
)
|
|
|
|
func sysctlsV1Dot0(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
|
|
return sysctls(podMetadata, podSpec, sysctlsAllowedV1Dot0)
|
|
}
|
|
|
|
func sysctlsV1Dot27(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
|
|
return sysctls(podMetadata, podSpec, sysctlsAllowedV1Dot27)
|
|
}
|
|
|
|
func sysctlsV1Dot29(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
|
|
return sysctls(podMetadata, podSpec, sysctlsAllowedV1Dot29)
|
|
}
|
|
|
|
func sysctls(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec, sysctls_allowed_set sets.String) CheckResult {
|
|
var forbiddenSysctls []string
|
|
|
|
if podSpec.SecurityContext != nil {
|
|
for _, sysctl := range podSpec.SecurityContext.Sysctls {
|
|
if !sysctls_allowed_set.Has(sysctl.Name) {
|
|
forbiddenSysctls = append(forbiddenSysctls, sysctl.Name)
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(forbiddenSysctls) > 0 {
|
|
return CheckResult{
|
|
Allowed: false,
|
|
ForbiddenReason: "forbidden sysctls",
|
|
ForbiddenDetail: strings.Join(forbiddenSysctls, ", "),
|
|
}
|
|
}
|
|
return CheckResult{Allowed: true}
|
|
}
|