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node authorizer changes to allow read on svcaccounts

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Signed-off-by: Anish Ramasekar <anish.ramasekar@gmail.com>
This commit is contained in:
Anish Ramasekar 2024-11-05 11:04:45 -08:00
parent d398de294d
commit 6defd8c0bd
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GPG Key ID: E96F745A34A409C2
3 changed files with 129 additions and 57 deletions
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25
plugin/pkg/auth/authorizer/node/node_authorizer.go
View File

@ -135,7 +135,7 @@ func (r *NodeAuthorizer) Authorize(ctx context.Context, attrs authorizer.Attribu
case vaResource:
return r.authorizeGet(nodeName, vaVertexType, attrs)
case svcAcctResource:
return r.authorizeCreateToken(nodeName, serviceAccountVertexType, attrs)
return r.authorizeServiceAccount(nodeName, attrs)
case leaseResource:
return r.authorizeLease(nodeName, attrs)
case csiNodeResource:
@ -196,7 +196,7 @@ func (r *NodeAuthorizer) authorizeGet(nodeName string, startingType vertexType,
func (r *NodeAuthorizer) authorizeReadNamespacedObject(nodeName string, startingType vertexType, attrs authorizer.Attributes) (authorizer.Decision, string, error) {
switch attrs.GetVerb() {
case "get", "list", "watch":
//ok
// ok
default:
klog.V(2).Infof("NODE DENY: '%s' %#v", nodeName, attrs)
return authorizer.DecisionNoOpinion, "can only read resources of this type", nil
@ -231,6 +231,23 @@ func (r *NodeAuthorizer) authorize(nodeName string, startingType vertexType, att
return authorizer.DecisionAllow, "", nil
}
// authorizeServiceAccount authorizes
// - "get" requests to serviceaccounts when KubeletServiceAccountTokenForCredentialProviders feature is enabled
// - "create" requests to serviceaccounts 'token' subresource of pods running on a node
func (r *NodeAuthorizer) authorizeServiceAccount(nodeName string, attrs authorizer.Attributes) (authorizer.Decision, string, error) {
verb := attrs.GetVerb()
if verb == "get" && attrs.GetSubresource() == "" {
if !r.features.Enabled(features.KubeletServiceAccountTokenForCredentialProviders) {
klog.V(2).Infof("NODE DENY: '%s' %#v", nodeName, attrs)
return authorizer.DecisionNoOpinion, "not allowed to get service accounts", nil
}
return r.authorizeReadNamespacedObject(nodeName, serviceAccountVertexType, attrs)
}
return r.authorizeCreateToken(nodeName, serviceAccountVertexType, attrs)
}
// authorizeCreateToken authorizes "create" requests to serviceaccounts 'token'
// subresource of pods running on a node
func (r *NodeAuthorizer) authorizeCreateToken(nodeName string, startingType vertexType, attrs authorizer.Attributes) (authorizer.Decision, string, error) {
@ -262,7 +279,7 @@ func (r *NodeAuthorizer) authorizeLease(nodeName string, attrs authorizer.Attrib
verb := attrs.GetVerb()
switch verb {
case "get", "create", "update", "patch", "delete":
//ok
// ok
default:
klog.V(2).Infof("NODE DENY: '%s' %#v", nodeName, attrs)
return authorizer.DecisionNoOpinion, "can only get, create, update, patch, or delete a node lease", nil
@ -291,7 +308,7 @@ func (r *NodeAuthorizer) authorizeCSINode(nodeName string, attrs authorizer.Attr
verb := attrs.GetVerb()
switch verb {
case "get", "create", "update", "patch", "delete":
//ok
// ok
default:
klog.V(2).Infof("NODE DENY: '%s' %#v", nodeName, attrs)
return authorizer.DecisionNoOpinion, "can only get, create, update, patch, or delete a CSINode", nil

156
plugin/pkg/auth/authorizer/node/node_authorizer_test.go
View File

@ -80,6 +80,12 @@ func TestNodeAuthorizer(t *testing.T) {
featuregatetesting.SetFeatureGateDuringTest(t, selectorAuthzEnabled, genericfeatures.AuthorizeWithSelectors, true)
featuregatetesting.SetFeatureGateDuringTest(t, selectorAuthzEnabled, features.AuthorizeNodeWithSelectors, true)
serviceAccountTokenForCredentialProvidersDisabled := utilfeature.DefaultFeatureGate.DeepCopy()
featuregatetesting.SetFeatureGateDuringTest(t, serviceAccountTokenForCredentialProvidersDisabled, features.KubeletServiceAccountTokenForCredentialProviders, false)
serviceAccountTokenForCredentialProvidersEnabled := utilfeature.DefaultFeatureGate.DeepCopy()
featuregatetesting.SetFeatureGateDuringTest(t, serviceAccountTokenForCredentialProvidersEnabled, features.KubeletServiceAccountTokenForCredentialProviders, true)
featureVariants := []struct {
suffix string
features featuregate.FeatureGate
@ -89,10 +95,11 @@ func TestNodeAuthorizer(t *testing.T) {
}
tests := []struct {
name string
attrs authorizer.AttributesRecord
expect authorizer.Decision
features featuregate.FeatureGate
name string
attrs authorizer.AttributesRecord
expect authorizer.Decision
expectReason string
features featuregate.FeatureGate
}{
{
name: "allowed configmap",
@ -115,19 +122,22 @@ func TestNodeAuthorizer(t *testing.T) {
expect: authorizer.DecisionAllow,
},
{
name: "disallowed list many secrets",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "secrets", Name: "", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
name: "disallowed list many secrets",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "secrets", Name: "", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
expectReason: "No Object name found,",
},
{
name: "disallowed watch many secrets",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "secrets", Name: "", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
name: "disallowed watch many secrets",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "secrets", Name: "", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
expectReason: "No Object name found,",
},
{
name: "disallowed list secrets from all namespaces with name",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "secrets", Name: "secret0-pod0-node0", Namespace: ""},
expect: authorizer.DecisionNoOpinion,
name: "disallowed list secrets from all namespaces with name",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "secrets", Name: "secret0-pod0-node0", Namespace: ""},
expect: authorizer.DecisionNoOpinion,
expectReason: "can only read namespaced object of this type",
},
{
name: "allowed shared secret via pod",
@ -219,6 +229,33 @@ func TestNodeAuthorizer(t *testing.T) {
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "update", Resource: "serviceaccounts", Subresource: "token", Name: "svcacct0-node0", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
},
{
name: "get allowed svcacct via pod - feature enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "get", Resource: "serviceaccounts", Name: "svcacct0-node0", Namespace: "ns0"},
expect: authorizer.DecisionAllow,
features: serviceAccountTokenForCredentialProvidersEnabled,
},
{
name: "disallowed get svcacct via pod - feature disabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "get", Resource: "serviceaccounts", Name: "svcacct0-node0", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
features: serviceAccountTokenForCredentialProvidersDisabled,
expectReason: "not allowed to get service accounts",
},
{
name: "disallowed list svcacct via pod - feature disabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "serviceaccounts", Name: "svcacct0-node0", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
features: serviceAccountTokenForCredentialProvidersDisabled,
expectReason: "can only create tokens for individual service accounts",
},
{
name: "disallowed watch svcacct via pod - feature disabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "serviceaccounts", Name: "svcacct0-node0", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion,
features: serviceAccountTokenForCredentialProvidersDisabled,
expectReason: "can only create tokens for individual service accounts",
},
{
name: "disallowed get lease in namespace other than kube-node-lease - feature enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "get", Resource: "leases", APIGroup: "coordination.k8s.io", Name: "node0", Namespace: "foo"},
@ -398,10 +435,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "disallowed unfiltered list ResourceSlices - selector authz enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "resourceslices", APIGroup: "resource.k8s.io"},
expect: authorizer.DecisionNoOpinion,
features: selectorAuthzEnabled,
name: "disallowed unfiltered list ResourceSlices - selector authz enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "resourceslices", APIGroup: "resource.k8s.io"},
expect: authorizer.DecisionNoOpinion,
features: selectorAuthzEnabled,
expectReason: "can only list/watch/deletecollection resourceslices with nodeName field selector",
},
{
name: "allowed filtered watch ResourceSlices",
@ -415,10 +453,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "disallowed unfiltered watch ResourceSlices - selector authz enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "resourceslices", APIGroup: "resource.k8s.io"},
expect: authorizer.DecisionNoOpinion,
features: selectorAuthzEnabled,
name: "disallowed unfiltered watch ResourceSlices - selector authz enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "resourceslices", APIGroup: "resource.k8s.io"},
expect: authorizer.DecisionNoOpinion,
features: selectorAuthzEnabled,
expectReason: "can only list/watch/deletecollection resourceslices with nodeName field selector",
},
{
name: "allowed get ResourceSlice",
@ -460,10 +499,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "get unrelated pod - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "get", Resource: "pods", APIGroup: "", Name: "pod0-node1", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "get unrelated pod - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "get", Resource: "pods", APIGroup: "", Name: "pod0-node1", Namespace: "ns0"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "no relationship found between node 'node0' and this object",
},
// list pods
{
@ -488,10 +528,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "list unrelated pods - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "pods", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "list unrelated pods - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "pods", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "can only list/watch pods with spec.nodeName field selector",
},
// watch pods
{
@ -516,10 +557,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "watch unrelated pods - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "pods", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "watch unrelated pods - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "pods", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "can only list/watch pods with spec.nodeName field selector",
},
// create, delete pods
{
@ -604,10 +646,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "get unrelated pod - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "get", Resource: "nodes", APIGroup: "", Name: "node1"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "get unrelated pod - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "get", Resource: "nodes", APIGroup: "", Name: "node1"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "node 'node0' cannot read 'node1', only its own Node object",
},
// list nodes
{
@ -622,10 +665,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "list single unrelated node - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "nodes", APIGroup: "", Name: "node1"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "list single unrelated node - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "nodes", APIGroup: "", Name: "node1"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "node 'node0' cannot read 'node1', only its own Node object",
},
{
name: "list all nodes - selector disabled",
@ -634,10 +678,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "list all nodes - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "nodes", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "list all nodes - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "list", Resource: "nodes", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "node 'node0' cannot read all nodes, only its own Node object",
},
// watch nodes
{
@ -652,10 +697,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "watch single unrelated node - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "nodes", APIGroup: "", Name: "node1"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "watch single unrelated node - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "nodes", APIGroup: "", Name: "node1"},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "node 'node0' cannot read 'node1', only its own Node object",
},
{
name: "watch all nodes - selector disabled",
@ -664,10 +710,11 @@ func TestNodeAuthorizer(t *testing.T) {
features: selectorAuthzDisabled,
},
{
name: "watch all nodes - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "nodes", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
name: "watch all nodes - selector enabled",
attrs: authorizer.AttributesRecord{User: node0, ResourceRequest: true, Verb: "watch", Resource: "nodes", APIGroup: ""},
expect: authorizer.DecisionNoOpinion, // stricter with selector authz enabled
features: selectorAuthzEnabled,
expectReason: "node 'node0' cannot read all nodes, only its own Node object",
},
// create nodes
{
@ -737,6 +784,9 @@ func TestNodeAuthorizer(t *testing.T) {
if decision != tc.expect {
t.Errorf("expected %v, got %v (%s)", tc.expect, decision, reason)
}
if reason != tc.expectReason {
t.Errorf("expected reason %q, got %q", tc.expectReason, reason)
}
})
}
}

5
plugin/pkg/auth/authorizer/rbac/bootstrappolicy/policy.go
View File

@ -189,6 +189,11 @@ func NodeRules() []rbacv1.PolicyRule {
if utilfeature.DefaultFeatureGate.Enabled(features.ClusterTrustBundle) {
nodePolicyRules = append(nodePolicyRules, rbacv1helpers.NewRule("get", "list", "watch").Groups(certificatesGroup).Resources("clustertrustbundles").RuleOrDie())
}
// Kubelet needs access to ServiceAccounts to support sending service account tokens to the credential provider.
// Use the Node authorizer to limit get to service accounts related to the node.
if utilfeature.DefaultFeatureGate.Enabled(features.KubeletServiceAccountTokenForCredentialProviders) {
nodePolicyRules = append(nodePolicyRules, rbacv1helpers.NewRule("get").Groups(legacyGroup).Resources("serviceaccounts").RuleOrDie())
}
return nodePolicyRules
}