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Include pod namespace in PSP 'use' authorization check

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This commit is contained in:
Jordan Liggitt 2017-03-01 16:21:40 -05:00
parent f1575cca52
commit 829e6f6cfb
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GPG Key ID: 24E7ADF9A3B42012
2 changed files with 67 additions and 49 deletions
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22
plugin/pkg/admission/security/podsecuritypolicy/admission.go
View File

@ -52,7 +52,7 @@ func init() {
}
// PSPMatchFn allows plugging in how PSPs are matched against user information.
type PSPMatchFn func(lister extensionslisters.PodSecurityPolicyLister, user user.Info, sa user.Info, authz authorizer.Authorizer) ([]*extensions.PodSecurityPolicy, error)
type PSPMatchFn func(lister extensionslisters.PodSecurityPolicyLister, user user.Info, sa user.Info, authz authorizer.Authorizer, namespace string) ([]*extensions.PodSecurityPolicy, error)
// podSecurityPolicyPlugin holds state for and implements the admission plugin.
type podSecurityPolicyPlugin struct {
@ -130,7 +130,7 @@ func (c *podSecurityPolicyPlugin) Admit(a admission.Attributes) error {
saInfo = serviceaccount.UserInfo(a.GetNamespace(), pod.Spec.ServiceAccountName, "")
}
matchedPolicies, err := c.pspMatcher(c.lister, a.GetUserInfo(), saInfo, c.authz)
matchedPolicies, err := c.pspMatcher(c.lister, a.GetUserInfo(), saInfo, c.authz, a.GetNamespace())
if err != nil {
return admission.NewForbidden(a, err)
}
@ -279,7 +279,7 @@ func (c *podSecurityPolicyPlugin) createProvidersFromPolicies(psps []*extensions
// TODO: this will likely need optimization since the initial implementation will
// always query for authorization. Needs scale testing and possibly checking against
// a cache.
func getMatchingPolicies(lister extensionslisters.PodSecurityPolicyLister, user user.Info, sa user.Info, authz authorizer.Authorizer) ([]*extensions.PodSecurityPolicy, error) {
func getMatchingPolicies(lister extensionslisters.PodSecurityPolicyLister, user user.Info, sa user.Info, authz authorizer.Authorizer, namespace string) ([]*extensions.PodSecurityPolicy, error) {
matchedPolicies := make([]*extensions.PodSecurityPolicy, 0)
list, err := lister.List(labels.Everything())
@ -289,7 +289,7 @@ func getMatchingPolicies(lister extensionslisters.PodSecurityPolicyLister, user
for _, constraint := range list {
// if no user info exists then the API is being hit via the unsecured port. In this case authorize the request.
if user == nil || authorizedForPolicy(user, constraint, authz) || authorizedForPolicy(sa, constraint, authz) {
if user == nil || authorizedForPolicy(user, namespace, constraint, authz) || authorizedForPolicy(sa, namespace, constraint, authz) {
matchedPolicies = append(matchedPolicies, constraint)
}
}
@ -297,26 +297,26 @@ func getMatchingPolicies(lister extensionslisters.PodSecurityPolicyLister, user
return matchedPolicies, nil
}
// authorizedForPolicy returns true if info is authorized to perform a "get" on policy.
func authorizedForPolicy(info user.Info, policy *extensions.PodSecurityPolicy, authz authorizer.Authorizer) bool {
// authorizedForPolicy returns true if info is authorized to perform the "use" verb on the policy resource.
func authorizedForPolicy(info user.Info, namespace string, policy *extensions.PodSecurityPolicy, authz authorizer.Authorizer) bool {
if info == nil {
return false
}
attr := buildAttributes(info, policy)
attr := buildAttributes(info, namespace, policy)
allowed, reason, err := authz.Authorize(attr)
if err != nil {
glog.V(5).Infof("cannot authorized for policy: %v,%v", reason, err)
glog.V(5).Infof("cannot authorize for policy: %v,%v", reason, err)
}
return allowed
}
// buildAttributes builds an attributes record for a SAR based on the user info and policy.
func buildAttributes(info user.Info, policy *extensions.PodSecurityPolicy) authorizer.Attributes {
// TODO consider checking against the namespace that the pod is being
// created in to allow per-namespace PSP definitions.
func buildAttributes(info user.Info, namespace string, policy *extensions.PodSecurityPolicy) authorizer.Attributes {
// check against the namespace that the pod is being created in to allow per-namespace PSP grants.
attr := authorizer.AttributesRecord{
User: info,
Verb: "use",
Namespace: namespace,
Name: policy.Name,
APIGroup: extensions.GroupName,
Resource: "podsecuritypolicies",

94
plugin/pkg/admission/security/podsecuritypolicy/admission_test.go
View File

@ -57,18 +57,18 @@ func NewTestAdmission(lister extensionslisters.PodSecurityPolicyLister) kadmissi
// TestAlwaysAllowedAuthorizer is a testing struct for testing that fulfills the authorizer interface.
type TestAuthorizer struct {
// disallowed contains names of disallowed policies. Map is keyed by user.Info.GetName()
disallowed map[string][]string
// usernameToNamespaceToAllowedPSPs contains the map of allowed PSPs.
// if nil, all PSPs are allowed.
usernameToNamespaceToAllowedPSPs map[string]map[string]map[string]bool
}
func (t *TestAuthorizer) Authorize(a authorizer.Attributes) (authorized bool, reason string, err error) {
disallowedForUser, _ := t.disallowed[a.GetUser().GetName()]
for _, name := range disallowedForUser {
if a.GetName() == name {
return false, "", nil
}
if t.usernameToNamespaceToAllowedPSPs == nil {
return true, "", nil
}
return true, "", nil
allowedInNamespace := t.usernameToNamespaceToAllowedPSPs[a.GetUser().GetName()][a.GetNamespace()][a.GetName()]
allowedClusterWide := t.usernameToNamespaceToAllowedPSPs[a.GetUser().GetName()][""][a.GetName()]
return (allowedInNamespace || allowedClusterWide), "", nil
}
var _ authorizer.Authorizer = &TestAuthorizer{}
@ -1546,17 +1546,21 @@ func TestGetMatchingPolicies(t *testing.T) {
}
tests := map[string]struct {
user user.Info
sa user.Info
expectedPolicies sets.String
inPolicies []*extensions.PodSecurityPolicy
disallowedPolicies map[string][]string
user user.Info
sa user.Info
ns string
expectedPolicies sets.String
inPolicies []*extensions.PodSecurityPolicy
allowed map[string]map[string]map[string]bool
}{
"policy allowed by user": {
user: &user.DefaultInfo{Name: "user"},
sa: &user.DefaultInfo{Name: "sa"},
disallowedPolicies: map[string][]string{
"sa": {"policy"},
ns: "test",
allowed: map[string]map[string]map[string]bool{
"user": {
"test": {"policy": true},
},
},
inPolicies: []*extensions.PodSecurityPolicy{policyWithName("policy")},
expectedPolicies: sets.NewString("policy"),
@ -1564,43 +1568,55 @@ func TestGetMatchingPolicies(t *testing.T) {
"policy allowed by sa": {
user: &user.DefaultInfo{Name: "user"},
sa: &user.DefaultInfo{Name: "sa"},
disallowedPolicies: map[string][]string{
"user": {"policy"},
ns: "test",
allowed: map[string]map[string]map[string]bool{
"sa": {
"test": {"policy": true},
},
},
inPolicies: []*extensions.PodSecurityPolicy{policyWithName("policy")},
expectedPolicies: sets.NewString("policy"),
},
"no policies allowed": {
user: &user.DefaultInfo{Name: "user"},
sa: &user.DefaultInfo{Name: "sa"},
disallowedPolicies: map[string][]string{
"user": {"policy"},
"sa": {"policy"},
},
user: &user.DefaultInfo{Name: "user"},
sa: &user.DefaultInfo{Name: "sa"},
ns: "test",
allowed: map[string]map[string]map[string]bool{},
inPolicies: []*extensions.PodSecurityPolicy{policyWithName("policy")},
expectedPolicies: sets.NewString(),
},
"multiple policies allowed": {
user: &user.DefaultInfo{Name: "user"},
sa: &user.DefaultInfo{Name: "sa"},
disallowedPolicies: map[string][]string{
"user": {"policy1", "policy3"},
"sa": {"policy2", "policy3"},
ns: "test",
allowed: map[string]map[string]map[string]bool{
"sa": {
"test": {"policy1": true},
"": {"policy4": true},
"other": {"policy6": true},
},
"user": {
"test": {"policy2": true},
"": {"policy5": true},
"other": {"policy7": true},
},
},
inPolicies: []*extensions.PodSecurityPolicy{
policyWithName("policy1"), // allowed by sa
policyWithName("policy2"), // allowed by user
policyWithName("policy3"), // not allowed
policyWithName("policy4"), // allowed by sa at cluster level
policyWithName("policy5"), // allowed by user at cluster level
policyWithName("policy6"), // not allowed in this namespace
policyWithName("policy7"), // not allowed in this namespace
},
expectedPolicies: sets.NewString("policy1", "policy2"),
expectedPolicies: sets.NewString("policy1", "policy2", "policy4", "policy5"),
},
"policies are allowed for nil user info": {
user: nil,
sa: &user.DefaultInfo{Name: "sa"},
disallowedPolicies: map[string][]string{
"user": {"policy1", "policy3"},
"sa": {"policy2", "policy3"},
},
user: nil,
sa: &user.DefaultInfo{Name: "sa"},
ns: "test",
allowed: map[string]map[string]map[string]bool{}, // authorizer not consulted
inPolicies: []*extensions.PodSecurityPolicy{
policyWithName("policy1"),
policyWithName("policy2"),
@ -1613,9 +1629,11 @@ func TestGetMatchingPolicies(t *testing.T) {
"policies are not allowed for nil sa info": {
user: &user.DefaultInfo{Name: "user"},
sa: nil,
disallowedPolicies: map[string][]string{
"user": {"policy1", "policy3"},
"sa": {"policy2", "policy3"},
ns: "test",
allowed: map[string]map[string]map[string]bool{
"user": {
"test": {"policy2": true},
},
},
inPolicies: []*extensions.PodSecurityPolicy{
policyWithName("policy1"),
@ -1634,8 +1652,8 @@ func TestGetMatchingPolicies(t *testing.T) {
store.Add(psp)
}
authz := &TestAuthorizer{disallowed: v.disallowedPolicies}
allowedPolicies, err := getMatchingPolicies(pspInformer.Lister(), v.user, v.sa, authz)
authz := &TestAuthorizer{usernameToNamespaceToAllowedPSPs: v.allowed}
allowedPolicies, err := getMatchingPolicies(pspInformer.Lister(), v.user, v.sa, authz, v.ns)
if err != nil {
t.Errorf("%s got unexpected error %#v", k, err)
continue