Basic ACL file.

Added function to read basic ACL from a CSV file.
Added implementation of Authorize based on that file's policies.
Added docs on authentication and authorization.
Added example file and tested it.

cmd/apiserver/apiserver.go

@@ -57,21 +57,22 @@ var (
 		"The port from which to serve read-only resources. If 0, don't serve on a "+
 		"read-only address. It is assumed that firewall rules are set up such that "+
 		"this port is not reachable from outside of the cluster.")
-	apiPrefix             = flag.String("api_prefix", "/api", "The prefix for API requests on the server. Default '/api'.")
-	storageVersion        = flag.String("storage_version", "", "The version to store resources with. Defaults to server preferred")
-	cloudProvider         = flag.String("cloud_provider", "", "The provider for cloud services.  Empty string for no provider.")
-	cloudConfigFile       = flag.String("cloud_config", "", "The path to the cloud provider configuration file.  Empty string for no configuration file.")
-	healthCheckMinions    = flag.Bool("health_check_minions", true, "If true, health check minions and filter unhealthy ones. Default true.")
-	eventTTL              = flag.Duration("event_ttl", 48*time.Hour, "Amount of time to retain events. Default 2 days.")
-	tokenAuthFile         = flag.String("token_auth_file", "", "If set, the file that will be used to secure the API server via token authentication.")
-	authorizationMode     = flag.String("authorization_mode", "AlwaysAllow", "Selects how to do authorization.  One of: "+strings.Join(apiserver.AuthorizationModeChoices, ","))
-	etcdServerList        util.StringList
-	etcdConfigFile        = flag.String("etcd_config", "", "The config file for the etcd client. Mutually exclusive with -etcd_servers.")
-	corsAllowedOriginList util.StringList
-	allowPrivileged       = flag.Bool("allow_privileged", false, "If true, allow privileged containers.")
-	portalNet             util.IPNet // TODO: make this a list
-	enableLogsSupport     = flag.Bool("enable_logs_support", true, "Enables server endpoint for log collection")
-	kubeletConfig         = client.KubeletConfig{
+	apiPrefix               = flag.String("api_prefix", "/api", "The prefix for API requests on the server. Default '/api'.")
+	storageVersion          = flag.String("storage_version", "", "The version to store resources with. Defaults to server preferred")
+	cloudProvider           = flag.String("cloud_provider", "", "The provider for cloud services.  Empty string for no provider.")
+	cloudConfigFile         = flag.String("cloud_config", "", "The path to the cloud provider configuration file.  Empty string for no configuration file.")
+	healthCheckMinions      = flag.Bool("health_check_minions", true, "If true, health check minions and filter unhealthy ones. Default true.")
+	eventTTL                = flag.Duration("event_ttl", 48*time.Hour, "Amount of time to retain events. Default 2 days.")
+	tokenAuthFile           = flag.String("token_auth_file", "", "If set, the file that will be used to secure the API server via token authentication.")
+	authorizationMode       = flag.String("authorization_mode", "AlwaysAllow", "Selects how to do authorization.  One of: "+strings.Join(apiserver.AuthorizationModeChoices, ","))
+	authorizationPolicyFile = flag.String("authorization_policy_file", "", "File with authorization policy in csv format, used with --authorization_mode=ABAC.")
+	etcdServerList          util.StringList
+	etcdConfigFile          = flag.String("etcd_config", "", "The config file for the etcd client. Mutually exclusive with -etcd_servers.")
+	corsAllowedOriginList   util.StringList
+	allowPrivileged         = flag.Bool("allow_privileged", false, "If true, allow privileged containers.")
+	portalNet               util.IPNet // TODO: make this a list
+	enableLogsSupport       = flag.Bool("enable_logs_support", true, "Enables server endpoint for log collection")
+	kubeletConfig           = client.KubeletConfig{
 		Port:        10250,
 		EnableHttps: false,
 	}
@@ -146,7 +147,7 @@ func main() {
 
 	n := net.IPNet(portalNet)
 
-	authorizer, err := apiserver.NewAuthorizerFromAuthorizationConfig(*authorizationMode)
+	authorizer, err := apiserver.NewAuthorizerFromAuthorizationConfig(*authorizationMode, *authorizationPolicyFile)
 	if err != nil {
 		glog.Fatalf("Invalid Authorization Config: %v", err)
 	}

docs/authentication.md

@@ -0,0 +1,19 @@
+# Authentication Plugins
+
+Kubernetes uses tokens to authenticate users for API calls.
+
+Authentication is enabled by passing the `--token_auth_file=SOMEFILE` option
+to apiserver.  Currently, tokens last indefinitely, and the token list cannot
+be changed without restarting apiserver.  We plan in the future for tokens to
+be short-lived, and to be generated as needed rather than stored in a file.
+
+The token file format is implemented in `pkg/auth/authenticator/tokenfile/...`
+and is a csv file with 3 columns: token, user name, user uid.
+
+## Plugin Development
+
+We plan for the Kubernetes API server to issue tokens
+after the user has been (re)authenticated by a *bedrock* authentication
+provider external to Kubernetes.  We plan to make it easy to develop modules
+that interface between kubernetes and a bedrock authentication provider (e.g.
+github.com, google.com, enterprise directory, kerberos, etc.)  

docs/authorization.md

@@ -0,0 +1,103 @@
+# Authorization Plugins
+
+
+In Kubernetes, authorization happens as a separate step from authentication.
+See the [authentication documentation](../authn_plugins/README.md) for an 
+overview of authentication.
+
+Authorization applies to all HTTP accesses on the main apiserver port. (The
+readonly port is not currently subject to authorization, but is planned to be
+removed soon.)
+
+The authorization check for any request compares attributes of the context of
+the request, (such as user, resource kind, and namespace) with access
+policies.  An API call must be allowed by some policy in order to proceed.
+
+The following implementations are available, and are selected by flag:
+  - `--authoriation_mode=AlwaysDeny`
+  - `--authoriation_mode=AlwaysAllow`
+  - `--authoriation_mode=ABAC`
+
+`AlwaysDeny` blocks all requests (used in tests).
+`AlwaysAllow` allows all requests; use if you don't need authorization.
+`ABAC` allows for user-configured authorization policy.  ABAC stands for Attribute-Based Access Control.
+
+## ABAC Mode
+### Request Attributes
+
+A request has 4 attributes that can be considered for authorization:
+  - user (the user-string which a user was authenticated as).
+  - whether the request is readonly (GETs are readonly)
+  - what kind of object is being accessed 
+    - applies only to the API endpoints, such as 
+        `/api/v1beta1/pods`.  For miscelaneous endpoints, like `/version`, the
+        kind is the empty string.
+  - the namespace of the object being access, or the empty string if the
+        endpoint does not support namespaced objects.
+
+We anticipate adding more attributes to allow finer grained access control and
+to assist in policy management.
+
+### Policy File Format
+
+For mode `ABAC`, also specify `--authorization_policy_file=SOME_FILENAME`.
+
+The file format is [one JSON object per line](http://jsonlines.org/).  There should be no enclosing list or map, just
+one map per line.
+
+Each line is a "policy object".  A policy object is a map with the following properties:
+    - `user`, type string; the user-string from `--token_auth_file`
+    - `readonly`, type boolean, when true, means that the policy only applies to GET
+      operations.
+    - `kind`, type string; a kind of object, from an URL, such as `pods`.
+    - `namespace`, type string; a namespace string.
+
+An unset property is the same as a property set to the zero value for its type (e.g. empty string, 0, false).
+However, unset should be preferred for readability.
+
+In the future, policies may be expressed in a JSON format, and managed via a REST
+interface.
+
+### Authorization Algorithm
+
+A request has attributes which correspond to the properties of a policy object.
+
+When a request is received, the attributes are determined.  Unknown attributes
+are set to the zero value of its type (e.g. empty string, 0, false). 
+
+An unset property will match any value of the corresponding
+attribute.  An unset attribute will match any value of the corresponding property.
+
+The tuple of attributes is checked for a match against every policy in the policy file.
+If at least one line matches the request attributes, then the request is authorized (but may fail later validation).
+
+To permit any user to do something, write a policy with the user property unset.
+To permit an action Policy with an unset namespace applies regardless of namespace.
+
+### Examples
+ 1. Alice can do anything: `{"user":"alice"}`
+ 2. Kubelet can read any pods: `{"user":"kubelet", "kind": "pods", "readonly": true}`
+ 3. Kubelet can read and write events: `{"user":"kubelet", "kind": "events"}`
+ 4. Bob can just read pods in namespace "projectCaribou": `{"user":"bob", "kind": "pods", "readonly": true, "ns": "projectCaribou"}`
+
+[Complete file example](../pkg/auth/authorizer/abac/example_policy_file.jsonl)
+
+## Plugin Developement
+
+Other implementations can be developed fairly easily.
+The APIserver calls the Authorizer interface:
+```go
+type Authorizer interface {
+  Authorize(a Attributes) error
+}
+```
+to determine whether or not to allow each API action.
+
+An authorization plugin is a module that implements this interface.
+Authorization plugin code goes in `pkg/auth/authorization/$MODULENAME`.
+
+An authorization module can be completely implemented in go, or can call out
+to a remote authorization service.  Authorization modules can implement
+their own caching to reduce the cost of repeated authorization calls with the
+same or similar arguments.  Developers should then consider the interaction between
+caching and revokation of permissions.

pkg/apiserver/authz.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/authorizer"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/authorizer/abac"
 )
 
 // Attributes implements authorizer.Attributes interface.
@@ -56,20 +57,26 @@ func NewAlwaysDenyAuthorizer() authorizer.Authorizer {
 const (
 	ModeAlwaysAllow string = "AlwaysAllow"
 	ModeAlwaysDeny  string = "AlwaysDeny"
+	ModeABAC        string = "ABAC"
 )
 
 // Keep this list in sync with constant list above.
-var AuthorizationModeChoices = []string{ModeAlwaysAllow, ModeAlwaysDeny}
+var AuthorizationModeChoices = []string{ModeAlwaysAllow, ModeAlwaysDeny, ModeABAC}
 
 // NewAuthorizerFromAuthorizationConfig returns the right sort of authorizer.Authorizer
 // based on the authorizationMode xor an error.  authorizationMode should be one of AuthorizationModeChoices.
-func NewAuthorizerFromAuthorizationConfig(authorizationMode string) (authorizer.Authorizer, error) {
+func NewAuthorizerFromAuthorizationConfig(authorizationMode string, authorizationPolicyFile string) (authorizer.Authorizer, error) {
+	if authorizationPolicyFile != "" && authorizationMode != "ABAC" {
+		return nil, errors.New("Cannot specify --authorization_policy_file without mode ABAC")
+	}
 	// Keep cases in sync with constant list above.
 	switch authorizationMode {
 	case ModeAlwaysAllow:
 		return NewAlwaysAllowAuthorizer(), nil
 	case ModeAlwaysDeny:
 		return NewAlwaysDenyAuthorizer(), nil
+	case ModeABAC:
+		return abac.NewFromFile(authorizationPolicyFile)
 	default:
 		return nil, errors.New("Unknown authorization mode")
 	}

pkg/auth/authorizer/abac/abac.go

@@ -0,0 +1,124 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 abac
+
+// Policy authorizes Kubernetes API actions using an Attribute-based access
+// control scheme.
+
+import (
+	"bufio"
+	"encoding/json"
+	"errors"
+	"os"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/authorizer"
+)
+
+// TODO: make this into a real API object.  Note that when that happens, it
+// will get MetaData.  However, the Kind and Namespace in the struct below
+// will be separate from the Kind and Namespace in the Metadata.  Obviously,
+// meta.Kind will be something like policy, and policy.Kind has to be allowed
+// to be different.  Less obviously, namespace needs to be different as well.
+// This will allow wildcard matching strings to be used in the future for the
+// body.Namespace, if we want to add that feature, without affecting the
+// meta.Namespace.
+type policy struct {
+	User string `json:"user,omitempty" yaml:"user,omitempty"`
+	// TODO: add support for groups as well as users.
+	// TODO: add support for robot accounts as well as human user accounts.
+	// TODO: decide how to namespace user names when multiple authentication
+	// providers are in use. Either add "Realm", or assume "user@example.com"
+	// format.
+
+	// TODO: Make the "cluster" Kinds be one API group (minions, bindings,
+	// events, endpoints).  The "user" Kinds are another (pods, services,
+	// replicationControllers, operations) Make a "plugin", e.g. build
+	// controller, be another group.  That way when we add a new object to a
+	// the API, we don't have to add lots of policy?
+
+	// TODO: make this a proper REST object with its own registry.
+	Readonly  bool   `json:"readonly,omitempty" yaml:"readonly,omitempty"`
+	Kind      string `json:"kind,omitempty" yaml:"kind,omitempty"`
+	Namespace string `json:"namespace,omitempty" yaml:"namespace,omitempty"`
+
+	// TODO: "expires" string in RFC3339 format.
+
+	// TODO: want a way to allow some users to restart containers of a pod but
+	// not delete or modify it.
+
+	// TODO: want a way to allow a controller to create a pod based only on a
+	// certain podTemplates.
+}
+
+type policyList []policy
+
+// TODO: Have policies be created via an API call and stored in REST storage.
+func NewFromFile(path string) (policyList, error) {
+	// File format is one map per line.  This allows easy concatentation of files,
+	// comments in files, and identification of errors by line number.
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	pl := make(policyList, 0)
+	var p policy
+
+	for scanner.Scan() {
+		b := scanner.Bytes()
+		// TODO: skip comment lines.
+		err = json.Unmarshal(b, &p)
+		if err != nil {
+			// TODO: line number in errors.
+			return nil, err
+		}
+		pl = append(pl, p)
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+	return pl, nil
+}
+
+func (p policy) matches(a authorizer.Attributes) bool {
+	if p.User == "" || p.User == a.GetUserName() {
+		if p.Readonly == false || (p.Readonly == a.IsReadOnly()) {
+			if p.Kind == "" || (p.Kind == a.GetKind()) {
+				if p.Namespace == "" || (p.Namespace == a.GetNamespace()) {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+// Authorizer implements authorizer.Authorize
+func (pl policyList) Authorize(a authorizer.Attributes) error {
+	for _, p := range pl {
+		if p.matches(a) {
+			return nil
+		}
+	}
+	return errors.New("No policy matched.")
+	// TODO: Benchmark how much time policy matching takes with a medium size
+	// policy file, compared to other steps such as encoding/decoding.
+	// Then, add Caching only if needed.
+}

pkg/auth/authorizer/abac/abac_test.go

@@ -0,0 +1,148 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 abac
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/authorizer"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/user"
+)
+
+func TestEmptyFile(t *testing.T) {
+	_, err := newWithContents(t, "")
+	if err != nil {
+		t.Errorf("unable to read policy file: %v", err)
+	}
+}
+
+func TestOneLineFileNoNewLine(t *testing.T) {
+	_, err := newWithContents(t, `{"user":"scheduler",  "readonly": true, "kind": "pods", "namespace":"ns1"}`)
+	if err != nil {
+		t.Errorf("unable to read policy file: %v", err)
+	}
+}
+
+func TestTwoLineFile(t *testing.T) {
+	_, err := newWithContents(t, `{"user":"scheduler",  "readonly": true, "kind": "pods"}
+{"user":"scheduler",  "readonly": true, "kind": "services"}
+`)
+	if err != nil {
+		t.Errorf("unable to read policy file: %v", err)
+	}
+}
+
+// Test the file that we will point users at as an example.
+func TestExampleFile(t *testing.T) {
+	_, err := NewFromFile("./example_policy_file.jsonl")
+	if err != nil {
+		t.Errorf("unable to read policy file: %v", err)
+	}
+}
+
+func NotTestAuthorize(t *testing.T) {
+	a, err := newWithContents(t, `{                     "readonly": true, "kind": "events"}
+{"user":"scheduler",  "readonly": true, "kind": "pods"}
+{"user":"scheduler",              "kind": "bindings"}
+{"user":"kubelet",    "readonly": true, "kind": "bindings"}
+{"user":"kubelet",                "kind": "events"}
+{"user":"alice",                                     "ns": "projectCaribou"}
+{"user":"bob",        "readonly": true,                    "ns": "projectCaribou"}
+`)
+	if err != nil {
+		t.Fatalf("unable to read policy file: %v", err)
+	}
+
+	uScheduler := user.DefaultInfo{Name: "scheduler", UID: "uid1"}
+	uAlice := user.DefaultInfo{Name: "alice", UID: "uid3"}
+	uChuck := user.DefaultInfo{Name: "chuck", UID: "uid5"}
+
+	testCases := []struct {
+		User        user.DefaultInfo
+		RO          bool
+		Kind        string
+		NS          string
+		ExpectAllow bool
+	}{
+		// Scheduler can read pods
+		{User: uScheduler, RO: true, Kind: "pods", NS: "ns1", ExpectAllow: true},
+		{User: uScheduler, RO: true, Kind: "pods", NS: "", ExpectAllow: true},
+		// Scheduler cannot write pods
+		{User: uScheduler, RO: false, Kind: "pods", NS: "ns1", ExpectAllow: false},
+		{User: uScheduler, RO: false, Kind: "pods", NS: "", ExpectAllow: false},
+		// Scheduler can write bindings
+		{User: uScheduler, RO: true, Kind: "bindings", NS: "ns1", ExpectAllow: true},
+		{User: uScheduler, RO: true, Kind: "bindings", NS: "", ExpectAllow: true},
+
+		// Alice can read and write anything in the right namespace.
+		{User: uAlice, RO: true, Kind: "pods", NS: "projectCaribou", ExpectAllow: true},
+		{User: uAlice, RO: true, Kind: "widgets", NS: "projectCaribou", ExpectAllow: true},
+		{User: uAlice, RO: true, Kind: "", NS: "projectCaribou", ExpectAllow: true},
+		{User: uAlice, RO: false, Kind: "pods", NS: "projectCaribou", ExpectAllow: true},
+		{User: uAlice, RO: false, Kind: "widgets", NS: "projectCaribou", ExpectAllow: true},
+		{User: uAlice, RO: false, Kind: "", NS: "projectCaribou", ExpectAllow: true},
+		// .. but not the wrong namespace.
+		{User: uAlice, RO: true, Kind: "pods", NS: "ns1", ExpectAllow: false},
+		{User: uAlice, RO: true, Kind: "widgets", NS: "ns1", ExpectAllow: false},
+		{User: uAlice, RO: true, Kind: "", NS: "ns1", ExpectAllow: false},
+
+		// Chuck can read events, since anyone can.
+		{User: uChuck, RO: true, Kind: "events", NS: "ns1", ExpectAllow: true},
+		{User: uChuck, RO: true, Kind: "events", NS: "", ExpectAllow: true},
+		// Chuck can't do other things.
+		{User: uChuck, RO: false, Kind: "events", NS: "ns1", ExpectAllow: false},
+		{User: uChuck, RO: true, Kind: "pods", NS: "ns1", ExpectAllow: false},
+		{User: uChuck, RO: true, Kind: "floop", NS: "ns1", ExpectAllow: false},
+		// Chunk can't access things with no kind or namespace
+		// TODO: find a way to give someone access to miscelaneous endpoints, such as
+		// /healthz, /version, etc.
+		{User: uChuck, RO: true, Kind: "", NS: "", ExpectAllow: false},
+	}
+	for _, tc := range testCases {
+		attr := authorizer.AttributesRecord{
+			User:      &tc.User,
+			ReadOnly:  tc.RO,
+			Kind:      tc.Kind,
+			Namespace: tc.NS,
+		}
+		t.Logf("tc: %v -> attr %v", tc, attr)
+		err := a.Authorize(attr)
+		actualAllow := bool(err == nil)
+		if tc.ExpectAllow != actualAllow {
+			t.Errorf("Expected allowed=%v but actually allowed=%v, for case %v",
+				tc.ExpectAllow, actualAllow, tc)
+		}
+	}
+}
+
+func newWithContents(t *testing.T, contents string) (authorizer.Authorizer, error) {
+	f, err := ioutil.TempFile("", "abac_test")
+	if err != nil {
+		t.Fatalf("unexpected error creating policyfile: %v", err)
+	}
+	f.Close()
+	defer os.Remove(f.Name())
+
+	if err := ioutil.WriteFile(f.Name(), []byte(contents), 0700); err != nil {
+		t.Fatalf("unexpected error writing policyfile: %v", err)
+	}
+
+	pl, err := NewFromFile(f.Name())
+	return pl, err
+}

pkg/auth/authorizer/abac/example_policy_file.jsonl

@@ -0,0 +1,7 @@
+{"user":"admin"}
+{"user":"scheduler", "readonly": true, "kind": "pods"}
+{"user":"scheduler", "kind": "bindings"}
+{"user":"kubelet",  "readonly": true, "kind": "bindings"}
+{"user":"kubelet", "kind": "events"}
+{"user":"alice", "ns": "projectCaribou"}
+{"user":"bob", "readonly": true, "ns": "projectCaribou"}

pkg/auth/authorizer/interfaces.go

@@ -54,18 +54,18 @@ type AttributesRecord struct {
 	Kind      string
 }
 
-func (a *AttributesRecord) GetUserName() string {
+func (a AttributesRecord) GetUserName() string {
 	return a.User.GetName()
 }
 
-func (a *AttributesRecord) IsReadOnly() bool {
+func (a AttributesRecord) IsReadOnly() bool {
 	return a.ReadOnly
 }
 
-func (a *AttributesRecord) GetNamespace() string {
+func (a AttributesRecord) GetNamespace() string {
 	return a.Namespace
 }
 
-func (a *AttributesRecord) GetKind() string {
+func (a AttributesRecord) GetKind() string {
 	return a.Kind
 }

test/integration/auth_test.go

@@ -34,6 +34,7 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/authorizer"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/auth/authorizer/abac"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/master"
 )
@@ -621,15 +622,23 @@ func TestUnknownUserIsUnauthorized(t *testing.T) {
 	}
 }
 
-// Inject into master an authorizer that uses namespace information.
-// TODO(etune): remove this test once a more comprehensive built-in authorizer is implemented.
-type allowFooNamespaceAuthorizer struct{}
-
-func (allowFooNamespaceAuthorizer) Authorize(a authorizer.Attributes) error {
-	if a.GetNamespace() == "foo" {
-		return nil
+func newAuthorizerWithContents(t *testing.T, contents string) authorizer.Authorizer {
+	f, err := ioutil.TempFile("", "auth_test")
+	if err != nil {
+		t.Fatalf("unexpected error creating policyfile: %v", err)
 	}
-	return errors.New("I can't allow that.  Try another namespace, buddy.")
+	f.Close()
+	defer os.Remove(f.Name())
+
+	if err := ioutil.WriteFile(f.Name(), []byte(contents), 0700); err != nil {
+		t.Fatalf("unexpected error writing policyfile: %v", err)
+	}
+
+	pl, err := abac.NewFromFile(f.Name())
+	if err != nil {
+		t.Fatalf("unexpected error creating authorizer from policyfile: %v", err)
+	}
+	return pl
 }
 
 // TestNamespaceAuthorization tests that authorization can be controlled
@@ -641,13 +650,13 @@ func TestNamespaceAuthorization(t *testing.T) {
 	defer os.Remove(tokenFilename)
 	// This file has alice and bob in it.
 
-	// Set up a master
-
 	helper, err := master.NewEtcdHelper(newEtcdClient(), "v1beta1")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}
 
+	a := newAuthorizerWithContents(t, `{"namespace": "foo"}
+`)
 	m := master.New(&master.Config{
 		EtcdHelper:        helper,
 		KubeletClient:     client.FakeKubeletClient{},
@@ -655,7 +664,7 @@ func TestNamespaceAuthorization(t *testing.T) {
 		EnableUISupport:   false,
 		APIPrefix:         "/api",
 		TokenAuthFile:     tokenFilename,
-		Authorizer:        allowFooNamespaceAuthorizer{},
+		Authorizer:        a,
 	})
 
 	s := httptest.NewServer(m.Handler)
@@ -706,17 +715,6 @@ func TestNamespaceAuthorization(t *testing.T) {
 	}
 }
 
-// Inject into master an authorizer that uses kind information.
-// TODO(etune): remove this test once a more comprehensive built-in authorizer is implemented.
-type allowServicesAuthorizer struct{}
-
-func (allowServicesAuthorizer) Authorize(a authorizer.Attributes) error {
-	if a.GetKind() == "services" {
-		return nil
-	}
-	return errors.New("I can't allow that.  Hint: try services.")
-}
-
 // TestKindAuthorization tests that authorization can be controlled
 // by namespace.
 func TestKindAuthorization(t *testing.T) {
@@ -733,6 +731,8 @@ func TestKindAuthorization(t *testing.T) {
 		t.Fatalf("unexpected error: %v", err)
 	}
 
+	a := newAuthorizerWithContents(t, `{"kind": "services"}
+`)
 	m := master.New(&master.Config{
 		EtcdHelper:        helper,
 		KubeletClient:     client.FakeKubeletClient{},
@@ -740,7 +740,7 @@ func TestKindAuthorization(t *testing.T) {
 		EnableUISupport:   false,
 		APIPrefix:         "/api",
 		TokenAuthFile:     tokenFilename,
-		Authorizer:        allowServicesAuthorizer{},
+		Authorizer:        a,
 	})
 
 	s := httptest.NewServer(m.Handler)
@@ -786,17 +786,6 @@ func TestKindAuthorization(t *testing.T) {
 	}
 }
 
-// Inject into master an authorizer that uses ReadOnly information.
-// TODO(etune): remove this test once a more comprehensive built-in authorizer is implemented.
-type allowReadAuthorizer struct{}
-
-func (allowReadAuthorizer) Authorize(a authorizer.Attributes) error {
-	if a.IsReadOnly() {
-		return nil
-	}
-	return errors.New("I'm afraid I can't let you do that.")
-}
-
 // TestReadOnlyAuthorization tests that authorization can be controlled
 // by namespace.
 func TestReadOnlyAuthorization(t *testing.T) {
@@ -813,6 +802,8 @@ func TestReadOnlyAuthorization(t *testing.T) {
 		t.Fatalf("unexpected error: %v", err)
 	}
 
+	a := newAuthorizerWithContents(t, `{"readonly": true}
+`)
 	m := master.New(&master.Config{
 		EtcdHelper:        helper,
 		KubeletClient:     client.FakeKubeletClient{},
@@ -820,7 +811,7 @@ func TestReadOnlyAuthorization(t *testing.T) {
 		EnableUISupport:   false,
 		APIPrefix:         "/api",
 		TokenAuthFile:     tokenFilename,
-		Authorizer:        allowReadAuthorizer{},
+		Authorizer:        a,
 	})
 
 	s := httptest.NewServer(m.Handler)