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[podsecurity] OS based updates to restricted standard

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This commit is contained in:
ravisantoshgudimetla 2021-10-26 16:06:06 -04:00
parent 3f630c415d
commit b3a2e6a3f4
6 changed files with 262 additions and 4 deletions
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14
staging/src/k8s.io/pod-security-admission/policy/check_allowPrivilegeEscalation.go
View File

@ -52,6 +52,11 @@ func CheckAllowPrivilegeEscalation() Check {
MinimumVersion: api.MajorMinorVersion(1, 8),
CheckPod: allowPrivilegeEscalation_1_8,
},
{
// Starting 1.25, windows pods would be exempted from this check using pod.spec.os field when set to windows.
MinimumVersion: api.MajorMinorVersion(1, 25),
CheckPod: allowPrivilegeEscalation_1_25,
},
},
}
}
@ -77,3 +82,12 @@ func allowPrivilegeEscalation_1_8(podMetadata *metav1.ObjectMeta, podSpec *corev
}
return CheckResult{Allowed: true}
}
func allowPrivilegeEscalation_1_25(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
// Pod API validation would have failed if podOS == Windows and if privilegeEscalation has been set.
// We can admit the Windows pod even if privilegeEscalation has not been set.
if podSpec.OS != nil && podSpec.OS.Name == corev1.Windows {
return CheckResult{Allowed: true}
}
return allowPrivilegeEscalation_1_8(podMetadata, podSpec)
}

61
staging/src/k8s.io/pod-security-admission/policy/check_allowPrivilegeEscalation_test.go
View File

@ -23,7 +23,66 @@ import (
utilpointer "k8s.io/utils/pointer"
)
func TestAllowPrivilegeEscalation(t *testing.T) {
func TestAllowPrivilegeEscalation_1_25(t *testing.T) {
tests := []struct {
name string
pod *corev1.Pod
expectReason string
expectDetail string
allowed bool
}{
{
name: "multiple containers",
pod: &corev1.Pod{Spec: corev1.PodSpec{
Containers: []corev1.Container{
{Name: "a"},
{Name: "b", SecurityContext: &corev1.SecurityContext{AllowPrivilegeEscalation: nil}},
{Name: "c", SecurityContext: &corev1.SecurityContext{AllowPrivilegeEscalation: utilpointer.Bool(true)}},
{Name: "d", SecurityContext: &corev1.SecurityContext{AllowPrivilegeEscalation: utilpointer.Bool(false)}},
}}},
expectReason: `allowPrivilegeEscalation != false`,
expectDetail: `containers "a", "b", "c" must set securityContext.allowPrivilegeEscalation=false`,
allowed: false,
},
{
name: "windows pod, admit without checking privilegeEscalation",
pod: &corev1.Pod{Spec: corev1.PodSpec{
OS: &corev1.PodOS{Name: corev1.Windows},
Containers: []corev1.Container{
{Name: "a"},
}}},
allowed: true,
},
{
name: "linux pod, reject if security context is not set",
pod: &corev1.Pod{Spec: corev1.PodSpec{
OS: &corev1.PodOS{Name: corev1.Linux},
Containers: []corev1.Container{
{Name: "a"},
}}},
expectReason: `allowPrivilegeEscalation != false`,
expectDetail: `container "a" must set securityContext.allowPrivilegeEscalation=false`,
allowed: false,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
result := allowPrivilegeEscalation_1_25(&tc.pod.ObjectMeta, &tc.pod.Spec)
if result.Allowed && !tc.allowed {
t.Fatal("expected disallowed")
}
if e, a := tc.expectReason, result.ForbiddenReason; e != a {
t.Errorf("expected\n%s\ngot\n%s", e, a)
}
if e, a := tc.expectDetail, result.ForbiddenDetail; e != a {
t.Errorf("expected\n%s\ngot\n%s", e, a)
}
})
}
}
func TestAllowPrivilegeEscalation_1_8(t *testing.T) {
tests := []struct {
name string
pod *corev1.Pod

15
staging/src/k8s.io/pod-security-admission/policy/check_capabilities_restricted.go
View File

@ -66,6 +66,12 @@ func CheckCapabilitiesRestricted() Check {
CheckPod: capabilitiesRestricted_1_22,
OverrideCheckIDs: []CheckID{checkCapabilitiesBaselineID},
},
// Starting 1.25, windows pods would be exempted from this check using pod.spec.os field when set to windows.
{
MinimumVersion: api.MajorMinorVersion(1, 25),
CheckPod: capabilitiesRestricted_1_25,
OverrideCheckIDs: []CheckID{checkCapabilitiesBaselineID},
},
},
}
}
@ -128,3 +134,12 @@ func capabilitiesRestricted_1_22(podMetadata *metav1.ObjectMeta, podSpec *corev1
}
return CheckResult{Allowed: true}
}
func capabilitiesRestricted_1_25(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
// Pod API validation would have failed if podOS == Windows and if capabilities have been set.
// We can admit the Windows pod even if capabilities has not been set.
if podSpec.OS != nil && podSpec.OS.Name == corev1.Windows {
return CheckResult{Allowed: true}
}
return capabilitiesRestricted_1_22(podMetadata, podSpec)
}

59
staging/src/k8s.io/pod-security-admission/policy/check_capabilities_restricted_test.go
View File

@ -22,7 +22,63 @@ import (
corev1 "k8s.io/api/core/v1"
)
func TestCapabilitiesRestricted(t *testing.T) {
func TestCapabilitiesRestricted_1_25(t *testing.T) {
tests := []struct {
name string
pod *corev1.Pod
expectReason string
expectDetail string
allowed bool
}{
{
name: "multiple containers",
pod: &corev1.Pod{Spec: corev1.PodSpec{
Containers: []corev1.Container{
{Name: "a", SecurityContext: &corev1.SecurityContext{Capabilities: &corev1.Capabilities{Add: []corev1.Capability{"FOO", "BAR"}}}},
{Name: "b", SecurityContext: &corev1.SecurityContext{Capabilities: &corev1.Capabilities{Add: []corev1.Capability{"BAR", "BAZ"}}}},
{Name: "c", SecurityContext: &corev1.SecurityContext{Capabilities: &corev1.Capabilities{Add: []corev1.Capability{"NET_BIND_SERVICE", "CHOWN"}, Drop: []corev1.Capability{"ALL", "FOO"}}}},
}}},
expectReason: `unrestricted capabilities`,
expectDetail: `containers "a", "b" must set securityContext.capabilities.drop=["ALL"]; containers "a", "b", "c" must not include "BAR", "BAZ", "CHOWN", "FOO" in securityContext.capabilities.add`,
},
{
name: "windows pod, admit without checking capabilities",
pod: &corev1.Pod{Spec: corev1.PodSpec{
OS: &corev1.PodOS{Name: corev1.Windows},
Containers: []corev1.Container{
{Name: "a"},
}}},
allowed: true,
},
{
name: "linux pod, reject if security context is not set",
pod: &corev1.Pod{Spec: corev1.PodSpec{
OS: &corev1.PodOS{Name: corev1.Linux},
Containers: []corev1.Container{
{Name: "a"},
}}},
expectReason: `unrestricted capabilities`,
expectDetail: `container "a" must set securityContext.capabilities.drop=["ALL"]`,
allowed: false,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
result := capabilitiesRestricted_1_25(&tc.pod.ObjectMeta, &tc.pod.Spec)
if result.Allowed && !tc.allowed {
t.Fatal("expected disallowed")
}
if e, a := tc.expectReason, result.ForbiddenReason; e != a {
t.Errorf("expected\n%s\ngot\n%s", e, a)
}
if e, a := tc.expectDetail, result.ForbiddenDetail; e != a {
t.Errorf("expected\n%s\ngot\n%s", e, a)
}
})
}
}
func TestCapabilitiesRestricted_1_22(t *testing.T) {
tests := []struct {
name string
pod *corev1.Pod
@ -41,7 +97,6 @@ func TestCapabilitiesRestricted(t *testing.T) {
expectDetail: `containers "a", "b" must set securityContext.capabilities.drop=["ALL"]; containers "a", "b", "c" must not include "BAR", "BAZ", "CHOWN", "FOO" in securityContext.capabilities.add`,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
result := capabilitiesRestricted_1_22(&tc.pod.ObjectMeta, &tc.pod.Spec)

17
staging/src/k8s.io/pod-security-admission/policy/check_seccompProfile_restricted.go
View File

@ -55,6 +55,12 @@ func CheckSeccompProfileRestricted() Check {
CheckPod: seccompProfileRestricted_1_19,
OverrideCheckIDs: []CheckID{checkSeccompBaselineID},
},
// Starting 1.25, windows pods would be exempted from this check using pod.spec.os field when set to windows.
{
MinimumVersion: api.MajorMinorVersion(1, 25),
CheckPod: seccompProfileRestricted_1_25,
OverrideCheckIDs: []CheckID{checkSeccompBaselineID},
},
},
}
}
@ -136,3 +142,14 @@ func seccompProfileRestricted_1_19(podMetadata *metav1.ObjectMeta, podSpec *core
return CheckResult{Allowed: true}
}
// seccompProfileRestricted_1_25 checks restricted policy on securityContext.seccompProfile field for kubernetes
// version 1.25 and above
func seccompProfileRestricted_1_25(podMetadata *metav1.ObjectMeta, podSpec *corev1.PodSpec) CheckResult {
// Pod API validation would have failed if podOS == Windows and if secCompProfile has been set.
// We can admit the Windows pod even if seccompProfile has not been set.
if podSpec.OS != nil && podSpec.OS.Name == corev1.Windows {
return CheckResult{Allowed: true}
}
return seccompProfileRestricted_1_19(podMetadata, podSpec)
}

100
staging/src/k8s.io/pod-security-admission/policy/check_seccompProfile_restricted_test.go
View File

@ -22,7 +22,105 @@ import (
corev1 "k8s.io/api/core/v1"
)
func TestSeccompProfileRestricted(t *testing.T) {
func TestSeccompProfileRestricted_1_25(t *testing.T) {
tests := []struct {
name string
pod *corev1.Pod
expectReason string
expectDetail string
allowed bool
}{
{
name: "no explicit seccomp",
pod: &corev1.Pod{Spec: corev1.PodSpec{
Containers: []corev1.Container{
{Name: "a"},
},
}},
expectReason: `seccompProfile`,
expectDetail: `pod or container "a" must set securityContext.seccompProfile.type to "RuntimeDefault" or "Localhost"`,
},
{
name: "no explicit seccomp, windows Pod",
pod: &corev1.Pod{Spec: corev1.PodSpec{
OS: &corev1.PodOS{Name: corev1.Windows},
Containers: []corev1.Container{
{Name: "a"},
},
}},
allowed: true,
},
{
name: "no explicit seccomp, linux pod",
pod: &corev1.Pod{Spec: corev1.PodSpec{
OS: &corev1.PodOS{Name: corev1.Linux},
Containers: []corev1.Container{
{Name: "a"},
},
}},
expectReason: `seccompProfile`,
expectDetail: `pod or container "a" must set securityContext.seccompProfile.type to "RuntimeDefault" or "Localhost"`,
allowed: false,
},
{
name: "pod seccomp invalid",
pod: &corev1.Pod{Spec: corev1.PodSpec{
SecurityContext: &corev1.PodSecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeUnconfined}},
Containers: []corev1.Container{
{Name: "a", SecurityContext: nil},
},
}},
expectReason: `seccompProfile`,
expectDetail: `pod must not set securityContext.seccompProfile.type to "Unconfined"`,
},
{
name: "containers seccomp invalid",
pod: &corev1.Pod{Spec: corev1.PodSpec{
SecurityContext: &corev1.PodSecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeRuntimeDefault}},
Containers: []corev1.Container{
{Name: "a", SecurityContext: nil},
{Name: "b", SecurityContext: &corev1.SecurityContext{}},
{Name: "c", SecurityContext: &corev1.SecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeUnconfined}}},
{Name: "d", SecurityContext: &corev1.SecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeUnconfined}}},
{Name: "e", SecurityContext: &corev1.SecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeRuntimeDefault}}},
{Name: "f", SecurityContext: &corev1.SecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeRuntimeDefault}}},
},
}},
expectReason: `seccompProfile`,
expectDetail: `containers "c", "d" must not set securityContext.seccompProfile.type to "Unconfined"`,
},
{
name: "pod nil, container fallthrough",
pod: &corev1.Pod{Spec: corev1.PodSpec{
Containers: []corev1.Container{
{Name: "a", SecurityContext: nil},
{Name: "b", SecurityContext: &corev1.SecurityContext{}},
{Name: "d", SecurityContext: &corev1.SecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeRuntimeDefault}}},
{Name: "e", SecurityContext: &corev1.SecurityContext{SeccompProfile: &corev1.SeccompProfile{Type: corev1.SeccompProfileTypeRuntimeDefault}}},
},
}},
expectReason: `seccompProfile`,
expectDetail: `pod or containers "a", "b" must set securityContext.seccompProfile.type to "RuntimeDefault" or "Localhost"`,
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
result := seccompProfileRestricted_1_25(&tc.pod.ObjectMeta, &tc.pod.Spec)
if result.Allowed && !tc.allowed {
t.Fatal("expected disallowed")
}
if e, a := tc.expectReason, result.ForbiddenReason; e != a {
t.Errorf("expected\n%s\ngot\n%s", e, a)
}
if e, a := tc.expectDetail, result.ForbiddenDetail; e != a {
t.Errorf("expected\n%s\ngot\n%s", e, a)
}
})
}
}
func TestSeccompProfileRestricted_1_19(t *testing.T) {
tests := []struct {
name string
pod *corev1.Pod