Add k8s.io/apiserver/plugins/pkg/authenticator from release-1.18

pkg/authenticator/basicauth/basicauth.go

+/*
+Copyright 2014 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 basicauth
+
+import (
+	"errors"
+	"net/http"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+)
+
+// Authenticator authenticates requests using basic auth
+type Authenticator struct {
+	auth authenticator.Password
+}
+
+// New returns a request authenticator that validates credentials using the provided password authenticator
+func New(auth authenticator.Password) *Authenticator {
+	return &Authenticator{auth}
+}
+
+var errInvalidAuth = errors.New("invalid username/password combination")
+
+// AuthenticateRequest authenticates the request using the "Authorization: Basic" header in the request
+func (a *Authenticator) AuthenticateRequest(req *http.Request) (*authenticator.Response, bool, error) {
+	username, password, found := req.BasicAuth()
+	if !found {
+		return nil, false, nil
+	}
+
+	resp, ok, err := a.auth.AuthenticatePassword(req.Context(), username, password)
+
+	// If the password authenticator didn't error, provide a default error
+	if !ok && err == nil {
+		err = errInvalidAuth
+	}
+
+	return resp, ok, err
+}

pkg/authenticator/basicauth/basicauth_test.go

+/*
+Copyright 2014 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 basicauth
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"testing"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/authentication/user"
+)
+
+type testPassword struct {
+	Username string
+	Password string
+	Called   bool
+
+	User user.Info
+	OK   bool
+	Err  error
+}
+
+func (t *testPassword) AuthenticatePassword(ctx context.Context, user, password string) (*authenticator.Response, bool, error) {
+	t.Called = true
+	t.Username = user
+	t.Password = password
+	return &authenticator.Response{User: t.User}, t.OK, t.Err
+}
+
+func TestBasicAuth(t *testing.T) {
+	testCases := map[string]struct {
+		Header   string
+		Password testPassword
+
+		ExpectedCalled   bool
+		ExpectedUsername string
+		ExpectedPassword string
+
+		ExpectedUser string
+		ExpectedOK   bool
+		ExpectedErr  bool
+	}{
+		"no auth": {},
+		"empty password basic header": {
+			ExpectedCalled:   true,
+			ExpectedUsername: "user_with_empty_password",
+			ExpectedPassword: "",
+			ExpectedErr:      true,
+		},
+		"valid basic header": {
+			ExpectedCalled:   true,
+			ExpectedUsername: "myuser",
+			ExpectedPassword: "mypassword:withcolon",
+			ExpectedErr:      true,
+		},
+		"password auth returned user": {
+			Password:         testPassword{User: &user.DefaultInfo{Name: "returneduser"}, OK: true},
+			ExpectedCalled:   true,
+			ExpectedUsername: "myuser",
+			ExpectedPassword: "mypw",
+			ExpectedUser:     "returneduser",
+			ExpectedOK:       true,
+		},
+		"password auth returned error": {
+			Password:         testPassword{Err: errors.New("auth error")},
+			ExpectedCalled:   true,
+			ExpectedUsername: "myuser",
+			ExpectedPassword: "mypw",
+			ExpectedErr:      true,
+		},
+	}
+
+	for k, testCase := range testCases {
+		password := testCase.Password
+		auth := authenticator.Request(New(&password))
+
+		req, _ := http.NewRequest("GET", "/", nil)
+		if testCase.ExpectedUsername != "" || testCase.ExpectedPassword != "" {
+			req.SetBasicAuth(testCase.ExpectedUsername, testCase.ExpectedPassword)
+		}
+
+		resp, ok, err := auth.AuthenticateRequest(req)
+
+		if testCase.ExpectedCalled != password.Called {
+			t.Errorf("%s: Expected called=%v, got %v", k, testCase.ExpectedCalled, password.Called)
+			continue
+		}
+		if testCase.ExpectedUsername != password.Username {
+			t.Errorf("%s: Expected called with username=%v, got %v", k, testCase.ExpectedUsername, password.Username)
+			continue
+		}
+		if testCase.ExpectedPassword != password.Password {
+			t.Errorf("%s: Expected called with password=%v, got %v", k, testCase.ExpectedPassword, password.Password)
+			continue
+		}
+
+		if testCase.ExpectedErr != (err != nil) {
+			t.Errorf("%s: Expected err=%v, got err=%v", k, testCase.ExpectedErr, err)
+			continue
+		}
+		if testCase.ExpectedOK != ok {
+			t.Errorf("%s: Expected ok=%v, got ok=%v", k, testCase.ExpectedOK, ok)
+			continue
+		}
+		if testCase.ExpectedUser != "" && testCase.ExpectedUser != resp.User.GetName() {
+			t.Errorf("%s: Expected user.GetName()=%v, got %v", k, testCase.ExpectedUser, resp.User.GetName())
+			continue
+		}
+	}
+}

pkg/authenticator/passwordfile/passwordfile.go

+/*
+Copyright 2015 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 passwordfile
+
+import (
+	"context"
+	"crypto/subtle"
+	"encoding/csv"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"k8s.io/klog"
+
+	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/authentication/user"
+)
+
+// PasswordAuthenticator authenticates users by password
+type PasswordAuthenticator struct {
+	users map[string]*userPasswordInfo
+}
+
+type userPasswordInfo struct {
+	info     *user.DefaultInfo
+	password string
+}
+
+// NewCSV returns a PasswordAuthenticator, populated from a CSV file.
+// The CSV file must contain records in the format "password,username,useruid"
+func NewCSV(path string) (*PasswordAuthenticator, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	recordNum := 0
+	users := make(map[string]*userPasswordInfo)
+	reader := csv.NewReader(file)
+	reader.FieldsPerRecord = -1
+	for {
+		record, err := reader.Read()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, err
+		}
+		if len(record) < 3 {
+			return nil, fmt.Errorf("password file '%s' must have at least 3 columns (password, user name, user uid), found %d", path, len(record))
+		}
+		obj := &userPasswordInfo{
+			info:     &user.DefaultInfo{Name: record[1], UID: record[2]},
+			password: record[0],
+		}
+		if len(record) >= 4 {
+			obj.info.Groups = strings.Split(record[3], ",")
+		}
+		recordNum++
+		if _, exist := users[obj.info.Name]; exist {
+			klog.Warningf("duplicate username '%s' has been found in password file '%s', record number '%d'", obj.info.Name, path, recordNum)
+		}
+		users[obj.info.Name] = obj
+	}
+
+	return &PasswordAuthenticator{users}, nil
+}
+
+// AuthenticatePassword returns user info if authentication is successful, nil otherwise
+func (a *PasswordAuthenticator) AuthenticatePassword(ctx context.Context, username, password string) (*authenticator.Response, bool, error) {
+	user, ok := a.users[username]
+	if !ok {
+		return nil, false, nil
+	}
+	if subtle.ConstantTimeCompare([]byte(user.password), []byte(password)) == 0 {
+		return nil, false, nil
+	}
+	return &authenticator.Response{User: user.info}, true, nil
+}

pkg/authenticator/passwordfile/passwordfile_test.go

+/*
+Copyright 2015 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 passwordfile
+
+import (
+	"context"
+	"io/ioutil"
+	"os"
+	"reflect"
+	"testing"
+
+	"k8s.io/apiserver/pkg/authentication/user"
+)
+
+func TestPasswordFile(t *testing.T) {
+	auth, err := newWithContents(t, `
+password1,user1,uid1
+password2,user2,uid2
+password3,user3,uid3,"group1,group2"
+password4,user4,uid4,"group2"
+password5,user5,uid5,group5
+password6,user6,uid6,group5,otherdata
+password7,user7,uid7,"group1,group2",otherdata
+`)
+	if err != nil {
+		t.Fatalf("unable to read passwordfile: %v", err)
+	}
+
+	testCases := []struct {
+		Username string
+		Password string
+		User     *user.DefaultInfo
+		Ok       bool
+		Err      bool
+	}{
+		{
+			Username: "user1",
+			Password: "password1",
+			User:     &user.DefaultInfo{Name: "user1", UID: "uid1"},
+			Ok:       true,
+		},
+		{
+			Username: "user2",
+			Password: "password2",
+			User:     &user.DefaultInfo{Name: "user2", UID: "uid2"},
+			Ok:       true,
+		},
+		{
+			Username: "user1",
+			Password: "password2",
+		},
+		{
+			Username: "user2",
+			Password: "password1",
+		},
+		{
+			Username: "user3",
+			Password: "password3",
+			User:     &user.DefaultInfo{Name: "user3", UID: "uid3", Groups: []string{"group1", "group2"}},
+			Ok:       true,
+		},
+		{
+			Username: "user4",
+			Password: "password4",
+			User:     &user.DefaultInfo{Name: "user4", UID: "uid4", Groups: []string{"group2"}},
+			Ok:       true,
+		},
+		{
+			Username: "user5",
+			Password: "password5",
+			User:     &user.DefaultInfo{Name: "user5", UID: "uid5", Groups: []string{"group5"}},
+			Ok:       true,
+		},
+		{
+			Username: "user6",
+			Password: "password6",
+			User:     &user.DefaultInfo{Name: "user6", UID: "uid6", Groups: []string{"group5"}},
+			Ok:       true,
+		},
+		{
+			Username: "user7",
+			Password: "password7",
+			User:     &user.DefaultInfo{Name: "user7", UID: "uid7", Groups: []string{"group1", "group2"}},
+			Ok:       true,
+		},
+		{
+			Username: "user7",
+			Password: "passwordbad",
+		},
+		{
+			Username: "userbad",
+			Password: "password7",
+		},
+		{
+			Username: "user8",
+			Password: "password8",
+		},
+	}
+	for i, testCase := range testCases {
+		resp, ok, err := auth.AuthenticatePassword(context.Background(), testCase.Username, testCase.Password)
+		if err != nil {
+			t.Errorf("%d: unexpected error: %v", i, err)
+		}
+		if testCase.User == nil {
+			if resp != nil {
+				t.Errorf("%d: unexpected non-nil user %#v", i, resp.User)
+			}
+		} else if !reflect.DeepEqual(testCase.User, resp.User) {
+			t.Errorf("%d: expected user %#v, got %#v", i, testCase.User, resp.User)
+		}
+		if testCase.Ok != ok {
+			t.Errorf("%d: expected auth %v, got %v", i, testCase.Ok, ok)
+		}
+	}
+}
+
+func TestBadPasswordFile(t *testing.T) {
+	if _, err := newWithContents(t, `
+password1,user1,uid1
+password2,user2,uid2
+password3,user3
+password4
+`); err == nil {
+		t.Fatalf("unexpected non error")
+	}
+}
+
+func TestInsufficientColumnsPasswordFile(t *testing.T) {
+	if _, err := newWithContents(t, "password4\n"); err == nil {
+		t.Fatalf("unexpected non error")
+	}
+}
+
+func newWithContents(t *testing.T, contents string) (auth *PasswordAuthenticator, err error) {
+	f, err := ioutil.TempFile("", "passwordfile_test")
+	if err != nil {
+		t.Fatalf("unexpected error creating passwordfile: %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 passwordfile: %v", err)
+	}
+
+	return NewCSV(f.Name())
+}