blob: 52122554a19e46e7962213ca0cf398545e5cfa9d [file] [log] [blame]
// Copyright 2016 The etcd 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 auth
import (
"bytes"
"context"
"encoding/binary"
"errors"
"sort"
"strings"
"sync"
"sync/atomic"
"go.etcd.io/etcd/auth/authpb"
"go.etcd.io/etcd/etcdserver/api/v3rpc/rpctypes"
pb "go.etcd.io/etcd/etcdserver/etcdserverpb"
"go.etcd.io/etcd/mvcc/backend"
"github.com/coreos/pkg/capnslog"
"go.uber.org/zap"
"golang.org/x/crypto/bcrypt"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
)
var (
enableFlagKey = []byte("authEnabled")
authEnabled = []byte{1}
authDisabled = []byte{0}
revisionKey = []byte("authRevision")
authBucketName = []byte("auth")
authUsersBucketName = []byte("authUsers")
authRolesBucketName = []byte("authRoles")
plog = capnslog.NewPackageLogger("go.etcd.io/etcd", "auth")
ErrRootUserNotExist = errors.New("auth: root user does not exist")
ErrRootRoleNotExist = errors.New("auth: root user does not have root role")
ErrUserAlreadyExist = errors.New("auth: user already exists")
ErrUserEmpty = errors.New("auth: user name is empty")
ErrUserNotFound = errors.New("auth: user not found")
ErrRoleAlreadyExist = errors.New("auth: role already exists")
ErrRoleNotFound = errors.New("auth: role not found")
ErrRoleEmpty = errors.New("auth: role name is empty")
ErrAuthFailed = errors.New("auth: authentication failed, invalid user ID or password")
ErrPermissionDenied = errors.New("auth: permission denied")
ErrRoleNotGranted = errors.New("auth: role is not granted to the user")
ErrPermissionNotGranted = errors.New("auth: permission is not granted to the role")
ErrAuthNotEnabled = errors.New("auth: authentication is not enabled")
ErrAuthOldRevision = errors.New("auth: revision in header is old")
ErrInvalidAuthToken = errors.New("auth: invalid auth token")
ErrInvalidAuthOpts = errors.New("auth: invalid auth options")
ErrInvalidAuthMgmt = errors.New("auth: invalid auth management")
ErrInvalidAuthMethod = errors.New("auth: invalid auth signature method")
ErrMissingKey = errors.New("auth: missing key data")
ErrKeyMismatch = errors.New("auth: public and private keys don't match")
ErrVerifyOnly = errors.New("auth: token signing attempted with verify-only key")
)
const (
rootUser = "root"
rootRole = "root"
tokenTypeSimple = "simple"
tokenTypeJWT = "jwt"
revBytesLen = 8
)
type AuthInfo struct {
Username string
Revision uint64
}
// AuthenticateParamIndex is used for a key of context in the parameters of Authenticate()
type AuthenticateParamIndex struct{}
// AuthenticateParamSimpleTokenPrefix is used for a key of context in the parameters of Authenticate()
type AuthenticateParamSimpleTokenPrefix struct{}
// AuthStore defines auth storage interface.
type AuthStore interface {
// AuthEnable turns on the authentication feature
AuthEnable() error
// AuthDisable turns off the authentication feature
AuthDisable()
// IsAuthEnabled returns true if the authentication feature is enabled.
IsAuthEnabled() bool
// Authenticate does authentication based on given user name and password
Authenticate(ctx context.Context, username, password string) (*pb.AuthenticateResponse, error)
// Recover recovers the state of auth store from the given backend
Recover(b backend.Backend)
// UserAdd adds a new user
UserAdd(r *pb.AuthUserAddRequest) (*pb.AuthUserAddResponse, error)
// UserDelete deletes a user
UserDelete(r *pb.AuthUserDeleteRequest) (*pb.AuthUserDeleteResponse, error)
// UserChangePassword changes a password of a user
UserChangePassword(r *pb.AuthUserChangePasswordRequest) (*pb.AuthUserChangePasswordResponse, error)
// UserGrantRole grants a role to the user
UserGrantRole(r *pb.AuthUserGrantRoleRequest) (*pb.AuthUserGrantRoleResponse, error)
// UserGet gets the detailed information of a users
UserGet(r *pb.AuthUserGetRequest) (*pb.AuthUserGetResponse, error)
// UserRevokeRole revokes a role of a user
UserRevokeRole(r *pb.AuthUserRevokeRoleRequest) (*pb.AuthUserRevokeRoleResponse, error)
// RoleAdd adds a new role
RoleAdd(r *pb.AuthRoleAddRequest) (*pb.AuthRoleAddResponse, error)
// RoleGrantPermission grants a permission to a role
RoleGrantPermission(r *pb.AuthRoleGrantPermissionRequest) (*pb.AuthRoleGrantPermissionResponse, error)
// RoleGet gets the detailed information of a role
RoleGet(r *pb.AuthRoleGetRequest) (*pb.AuthRoleGetResponse, error)
// RoleRevokePermission gets the detailed information of a role
RoleRevokePermission(r *pb.AuthRoleRevokePermissionRequest) (*pb.AuthRoleRevokePermissionResponse, error)
// RoleDelete gets the detailed information of a role
RoleDelete(r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error)
// UserList gets a list of all users
UserList(r *pb.AuthUserListRequest) (*pb.AuthUserListResponse, error)
// RoleList gets a list of all roles
RoleList(r *pb.AuthRoleListRequest) (*pb.AuthRoleListResponse, error)
// IsPutPermitted checks put permission of the user
IsPutPermitted(authInfo *AuthInfo, key []byte) error
// IsRangePermitted checks range permission of the user
IsRangePermitted(authInfo *AuthInfo, key, rangeEnd []byte) error
// IsDeleteRangePermitted checks delete-range permission of the user
IsDeleteRangePermitted(authInfo *AuthInfo, key, rangeEnd []byte) error
// IsAdminPermitted checks admin permission of the user
IsAdminPermitted(authInfo *AuthInfo) error
// GenTokenPrefix produces a random string in a case of simple token
// in a case of JWT, it produces an empty string
GenTokenPrefix() (string, error)
// Revision gets current revision of authStore
Revision() uint64
// CheckPassword checks a given pair of username and password is correct
CheckPassword(username, password string) (uint64, error)
// Close does cleanup of AuthStore
Close() error
// AuthInfoFromCtx gets AuthInfo from gRPC's context
AuthInfoFromCtx(ctx context.Context) (*AuthInfo, error)
// AuthInfoFromTLS gets AuthInfo from TLS info of gRPC's context
AuthInfoFromTLS(ctx context.Context) *AuthInfo
// WithRoot generates and installs a token that can be used as a root credential
WithRoot(ctx context.Context) context.Context
// HasRole checks that user has role
HasRole(user, role string) bool
}
type TokenProvider interface {
info(ctx context.Context, token string, revision uint64) (*AuthInfo, bool)
assign(ctx context.Context, username string, revision uint64) (string, error)
enable()
disable()
invalidateUser(string)
genTokenPrefix() (string, error)
}
type authStore struct {
// atomic operations; need 64-bit align, or 32-bit tests will crash
revision uint64
lg *zap.Logger
be backend.Backend
enabled bool
enabledMu sync.RWMutex
rangePermCache map[string]*unifiedRangePermissions // username -> unifiedRangePermissions
tokenProvider TokenProvider
bcryptCost int // the algorithm cost / strength for hashing auth passwords
}
func (as *authStore) AuthEnable() error {
as.enabledMu.Lock()
defer as.enabledMu.Unlock()
if as.enabled {
if as.lg != nil {
as.lg.Info("authentication is already enabled; ignored auth enable request")
} else {
plog.Noticef("Authentication already enabled")
}
return nil
}
b := as.be
tx := b.BatchTx()
tx.Lock()
defer func() {
tx.Unlock()
b.ForceCommit()
}()
u := getUser(as.lg, tx, rootUser)
if u == nil {
return ErrRootUserNotExist
}
if !hasRootRole(u) {
return ErrRootRoleNotExist
}
tx.UnsafePut(authBucketName, enableFlagKey, authEnabled)
as.enabled = true
as.tokenProvider.enable()
as.rangePermCache = make(map[string]*unifiedRangePermissions)
as.setRevision(getRevision(tx))
if as.lg != nil {
as.lg.Info("enabled authentication")
} else {
plog.Noticef("Authentication enabled")
}
return nil
}
func (as *authStore) AuthDisable() {
as.enabledMu.Lock()
defer as.enabledMu.Unlock()
if !as.enabled {
return
}
b := as.be
tx := b.BatchTx()
tx.Lock()
tx.UnsafePut(authBucketName, enableFlagKey, authDisabled)
as.commitRevision(tx)
tx.Unlock()
b.ForceCommit()
as.enabled = false
as.tokenProvider.disable()
if as.lg != nil {
as.lg.Info("disabled authentication")
} else {
plog.Noticef("Authentication disabled")
}
}
func (as *authStore) Close() error {
as.enabledMu.Lock()
defer as.enabledMu.Unlock()
if !as.enabled {
return nil
}
as.tokenProvider.disable()
return nil
}
func (as *authStore) Authenticate(ctx context.Context, username, password string) (*pb.AuthenticateResponse, error) {
if !as.IsAuthEnabled() {
return nil, ErrAuthNotEnabled
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, username)
if user == nil {
return nil, ErrAuthFailed
}
if user.Options.NoPassword {
return nil, ErrAuthFailed
}
// Password checking is already performed in the API layer, so we don't need to check for now.
// Staleness of password can be detected with OCC in the API layer, too.
token, err := as.tokenProvider.assign(ctx, username, as.Revision())
if err != nil {
return nil, err
}
if as.lg != nil {
as.lg.Debug(
"authenticated a user",
zap.String("user-name", username),
zap.String("token", token),
)
} else {
plog.Debugf("authorized %s, token is %s", username, token)
}
return &pb.AuthenticateResponse{Token: token}, nil
}
func (as *authStore) CheckPassword(username, password string) (uint64, error) {
if !as.IsAuthEnabled() {
return 0, ErrAuthNotEnabled
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, username)
if user == nil {
return 0, ErrAuthFailed
}
if user.Options.NoPassword {
return 0, ErrAuthFailed
}
if bcrypt.CompareHashAndPassword(user.Password, []byte(password)) != nil {
if as.lg != nil {
as.lg.Info("invalid password", zap.String("user-name", username))
} else {
plog.Noticef("authentication failed, invalid password for user %s", username)
}
return 0, ErrAuthFailed
}
return getRevision(tx), nil
}
func (as *authStore) Recover(be backend.Backend) {
enabled := false
as.be = be
tx := be.BatchTx()
tx.Lock()
_, vs := tx.UnsafeRange(authBucketName, enableFlagKey, nil, 0)
if len(vs) == 1 {
if bytes.Equal(vs[0], authEnabled) {
enabled = true
}
}
as.setRevision(getRevision(tx))
tx.Unlock()
as.enabledMu.Lock()
as.enabled = enabled
as.enabledMu.Unlock()
}
func (as *authStore) UserAdd(r *pb.AuthUserAddRequest) (*pb.AuthUserAddResponse, error) {
if len(r.Name) == 0 {
return nil, ErrUserEmpty
}
var hashed []byte
var err error
if r.Options != nil && !r.Options.NoPassword {
hashed, err = bcrypt.GenerateFromPassword([]byte(r.Password), as.bcryptCost)
if err != nil {
if as.lg != nil {
as.lg.Warn(
"failed to bcrypt hash password",
zap.String("user-name", r.Name),
zap.Error(err),
)
} else {
plog.Errorf("failed to hash password: %s", err)
}
return nil, err
}
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, r.Name)
if user != nil {
return nil, ErrUserAlreadyExist
}
options := r.Options
if options == nil {
options = &authpb.UserAddOptions{
NoPassword: false,
}
}
newUser := &authpb.User{
Name: []byte(r.Name),
Password: hashed,
Options: options,
}
putUser(as.lg, tx, newUser)
as.commitRevision(tx)
if as.lg != nil {
as.lg.Info("added a user", zap.String("user-name", r.Name))
} else {
plog.Noticef("added a new user: %s", r.Name)
}
return &pb.AuthUserAddResponse{}, nil
}
func (as *authStore) UserDelete(r *pb.AuthUserDeleteRequest) (*pb.AuthUserDeleteResponse, error) {
if as.enabled && r.Name == rootUser {
if as.lg != nil {
as.lg.Warn("cannot delete 'root' user", zap.String("user-name", r.Name))
} else {
plog.Errorf("the user root must not be deleted")
}
return nil, ErrInvalidAuthMgmt
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, r.Name)
if user == nil {
return nil, ErrUserNotFound
}
delUser(tx, r.Name)
as.commitRevision(tx)
as.invalidateCachedPerm(r.Name)
as.tokenProvider.invalidateUser(r.Name)
if as.lg != nil {
as.lg.Info(
"deleted a user",
zap.String("user-name", r.Name),
zap.Strings("user-roles", user.Roles),
)
} else {
plog.Noticef("deleted a user: %s", r.Name)
}
return &pb.AuthUserDeleteResponse{}, nil
}
func (as *authStore) UserChangePassword(r *pb.AuthUserChangePasswordRequest) (*pb.AuthUserChangePasswordResponse, error) {
// TODO(mitake): measure the cost of bcrypt.GenerateFromPassword()
// If the cost is too high, we should move the encryption to outside of the raft
hashed, err := bcrypt.GenerateFromPassword([]byte(r.Password), as.bcryptCost)
if err != nil {
if as.lg != nil {
as.lg.Warn(
"failed to bcrypt hash password",
zap.String("user-name", r.Name),
zap.Error(err),
)
} else {
plog.Errorf("failed to hash password: %s", err)
}
return nil, err
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, r.Name)
if user == nil {
return nil, ErrUserNotFound
}
updatedUser := &authpb.User{
Name: []byte(r.Name),
Roles: user.Roles,
Password: hashed,
Options: user.Options,
}
putUser(as.lg, tx, updatedUser)
as.commitRevision(tx)
as.invalidateCachedPerm(r.Name)
as.tokenProvider.invalidateUser(r.Name)
if as.lg != nil {
as.lg.Info(
"changed a password of a user",
zap.String("user-name", r.Name),
zap.Strings("user-roles", user.Roles),
)
} else {
plog.Noticef("changed a password of a user: %s", r.Name)
}
return &pb.AuthUserChangePasswordResponse{}, nil
}
func (as *authStore) UserGrantRole(r *pb.AuthUserGrantRoleRequest) (*pb.AuthUserGrantRoleResponse, error) {
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, r.User)
if user == nil {
return nil, ErrUserNotFound
}
if r.Role != rootRole {
role := getRole(tx, r.Role)
if role == nil {
return nil, ErrRoleNotFound
}
}
idx := sort.SearchStrings(user.Roles, r.Role)
if idx < len(user.Roles) && user.Roles[idx] == r.Role {
if as.lg != nil {
as.lg.Warn(
"ignored grant role request to a user",
zap.String("user-name", r.User),
zap.Strings("user-roles", user.Roles),
zap.String("duplicate-role-name", r.Role),
)
} else {
plog.Warningf("user %s is already granted role %s", r.User, r.Role)
}
return &pb.AuthUserGrantRoleResponse{}, nil
}
user.Roles = append(user.Roles, r.Role)
sort.Strings(user.Roles)
putUser(as.lg, tx, user)
as.invalidateCachedPerm(r.User)
as.commitRevision(tx)
if as.lg != nil {
as.lg.Info(
"granted a role to a user",
zap.String("user-name", r.User),
zap.Strings("user-roles", user.Roles),
zap.String("added-role-name", r.Role),
)
} else {
plog.Noticef("granted role %s to user %s", r.Role, r.User)
}
return &pb.AuthUserGrantRoleResponse{}, nil
}
func (as *authStore) UserGet(r *pb.AuthUserGetRequest) (*pb.AuthUserGetResponse, error) {
tx := as.be.BatchTx()
tx.Lock()
user := getUser(as.lg, tx, r.Name)
tx.Unlock()
if user == nil {
return nil, ErrUserNotFound
}
var resp pb.AuthUserGetResponse
resp.Roles = append(resp.Roles, user.Roles...)
return &resp, nil
}
func (as *authStore) UserList(r *pb.AuthUserListRequest) (*pb.AuthUserListResponse, error) {
tx := as.be.BatchTx()
tx.Lock()
users := getAllUsers(as.lg, tx)
tx.Unlock()
resp := &pb.AuthUserListResponse{Users: make([]string, len(users))}
for i := range users {
resp.Users[i] = string(users[i].Name)
}
return resp, nil
}
func (as *authStore) UserRevokeRole(r *pb.AuthUserRevokeRoleRequest) (*pb.AuthUserRevokeRoleResponse, error) {
if as.enabled && r.Name == rootUser && r.Role == rootRole {
if as.lg != nil {
as.lg.Warn(
"'root' user cannot revoke 'root' role",
zap.String("user-name", r.Name),
zap.String("role-name", r.Role),
)
} else {
plog.Errorf("the role root must not be revoked from the user root")
}
return nil, ErrInvalidAuthMgmt
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, r.Name)
if user == nil {
return nil, ErrUserNotFound
}
updatedUser := &authpb.User{
Name: user.Name,
Password: user.Password,
Options: user.Options,
}
for _, role := range user.Roles {
if role != r.Role {
updatedUser.Roles = append(updatedUser.Roles, role)
}
}
if len(updatedUser.Roles) == len(user.Roles) {
return nil, ErrRoleNotGranted
}
putUser(as.lg, tx, updatedUser)
as.invalidateCachedPerm(r.Name)
as.commitRevision(tx)
if as.lg != nil {
as.lg.Info(
"revoked a role from a user",
zap.String("user-name", r.Name),
zap.Strings("old-user-roles", user.Roles),
zap.Strings("new-user-roles", updatedUser.Roles),
zap.String("revoked-role-name", r.Role),
)
} else {
plog.Noticef("revoked role %s from user %s", r.Role, r.Name)
}
return &pb.AuthUserRevokeRoleResponse{}, nil
}
func (as *authStore) RoleGet(r *pb.AuthRoleGetRequest) (*pb.AuthRoleGetResponse, error) {
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
var resp pb.AuthRoleGetResponse
role := getRole(tx, r.Role)
if role == nil {
return nil, ErrRoleNotFound
}
resp.Perm = append(resp.Perm, role.KeyPermission...)
return &resp, nil
}
func (as *authStore) RoleList(r *pb.AuthRoleListRequest) (*pb.AuthRoleListResponse, error) {
tx := as.be.BatchTx()
tx.Lock()
roles := getAllRoles(as.lg, tx)
tx.Unlock()
resp := &pb.AuthRoleListResponse{Roles: make([]string, len(roles))}
for i := range roles {
resp.Roles[i] = string(roles[i].Name)
}
return resp, nil
}
func (as *authStore) RoleRevokePermission(r *pb.AuthRoleRevokePermissionRequest) (*pb.AuthRoleRevokePermissionResponse, error) {
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
role := getRole(tx, r.Role)
if role == nil {
return nil, ErrRoleNotFound
}
updatedRole := &authpb.Role{
Name: role.Name,
}
for _, perm := range role.KeyPermission {
if !bytes.Equal(perm.Key, r.Key) || !bytes.Equal(perm.RangeEnd, r.RangeEnd) {
updatedRole.KeyPermission = append(updatedRole.KeyPermission, perm)
}
}
if len(role.KeyPermission) == len(updatedRole.KeyPermission) {
return nil, ErrPermissionNotGranted
}
putRole(as.lg, tx, updatedRole)
// TODO(mitake): currently single role update invalidates every cache
// It should be optimized.
as.clearCachedPerm()
as.commitRevision(tx)
if as.lg != nil {
as.lg.Info(
"revoked a permission on range",
zap.String("role-name", r.Role),
zap.String("key", string(r.Key)),
zap.String("range-end", string(r.RangeEnd)),
)
} else {
plog.Noticef("revoked key %s from role %s", r.Key, r.Role)
}
return &pb.AuthRoleRevokePermissionResponse{}, nil
}
func (as *authStore) RoleDelete(r *pb.AuthRoleDeleteRequest) (*pb.AuthRoleDeleteResponse, error) {
if as.enabled && r.Role == rootRole {
if as.lg != nil {
as.lg.Warn("cannot delete 'root' role", zap.String("role-name", r.Role))
} else {
plog.Errorf("the role root must not be deleted")
}
return nil, ErrInvalidAuthMgmt
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
role := getRole(tx, r.Role)
if role == nil {
return nil, ErrRoleNotFound
}
delRole(tx, r.Role)
users := getAllUsers(as.lg, tx)
for _, user := range users {
updatedUser := &authpb.User{
Name: user.Name,
Password: user.Password,
Options: user.Options,
}
for _, role := range user.Roles {
if role != r.Role {
updatedUser.Roles = append(updatedUser.Roles, role)
}
}
if len(updatedUser.Roles) == len(user.Roles) {
continue
}
putUser(as.lg, tx, updatedUser)
as.invalidateCachedPerm(string(user.Name))
}
as.commitRevision(tx)
if as.lg != nil {
as.lg.Info("deleted a role", zap.String("role-name", r.Role))
} else {
plog.Noticef("deleted role %s", r.Role)
}
return &pb.AuthRoleDeleteResponse{}, nil
}
func (as *authStore) RoleAdd(r *pb.AuthRoleAddRequest) (*pb.AuthRoleAddResponse, error) {
if len(r.Name) == 0 {
return nil, ErrRoleEmpty
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
role := getRole(tx, r.Name)
if role != nil {
return nil, ErrRoleAlreadyExist
}
newRole := &authpb.Role{
Name: []byte(r.Name),
}
putRole(as.lg, tx, newRole)
as.commitRevision(tx)
if as.lg != nil {
as.lg.Info("created a role", zap.String("role-name", r.Name))
} else {
plog.Noticef("Role %s is created", r.Name)
}
return &pb.AuthRoleAddResponse{}, nil
}
func (as *authStore) authInfoFromToken(ctx context.Context, token string) (*AuthInfo, bool) {
return as.tokenProvider.info(ctx, token, as.Revision())
}
type permSlice []*authpb.Permission
func (perms permSlice) Len() int {
return len(perms)
}
func (perms permSlice) Less(i, j int) bool {
return bytes.Compare(perms[i].Key, perms[j].Key) < 0
}
func (perms permSlice) Swap(i, j int) {
perms[i], perms[j] = perms[j], perms[i]
}
func (as *authStore) RoleGrantPermission(r *pb.AuthRoleGrantPermissionRequest) (*pb.AuthRoleGrantPermissionResponse, error) {
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
role := getRole(tx, r.Name)
if role == nil {
return nil, ErrRoleNotFound
}
idx := sort.Search(len(role.KeyPermission), func(i int) bool {
return bytes.Compare(role.KeyPermission[i].Key, r.Perm.Key) >= 0
})
if idx < len(role.KeyPermission) && bytes.Equal(role.KeyPermission[idx].Key, r.Perm.Key) && bytes.Equal(role.KeyPermission[idx].RangeEnd, r.Perm.RangeEnd) {
// update existing permission
role.KeyPermission[idx].PermType = r.Perm.PermType
} else {
// append new permission to the role
newPerm := &authpb.Permission{
Key: r.Perm.Key,
RangeEnd: r.Perm.RangeEnd,
PermType: r.Perm.PermType,
}
role.KeyPermission = append(role.KeyPermission, newPerm)
sort.Sort(permSlice(role.KeyPermission))
}
putRole(as.lg, tx, role)
// TODO(mitake): currently single role update invalidates every cache
// It should be optimized.
as.clearCachedPerm()
as.commitRevision(tx)
if as.lg != nil {
as.lg.Info(
"granted/updated a permission to a user",
zap.String("user-name", r.Name),
zap.String("permission-name", authpb.Permission_Type_name[int32(r.Perm.PermType)]),
)
} else {
plog.Noticef("role %s's permission of key %s is updated as %s", r.Name, r.Perm.Key, authpb.Permission_Type_name[int32(r.Perm.PermType)])
}
return &pb.AuthRoleGrantPermissionResponse{}, nil
}
func (as *authStore) isOpPermitted(userName string, revision uint64, key, rangeEnd []byte, permTyp authpb.Permission_Type) error {
// TODO(mitake): this function would be costly so we need a caching mechanism
if !as.IsAuthEnabled() {
return nil
}
// only gets rev == 0 when passed AuthInfo{}; no user given
if revision == 0 {
return ErrUserEmpty
}
if revision < as.Revision() {
return ErrAuthOldRevision
}
tx := as.be.BatchTx()
tx.Lock()
defer tx.Unlock()
user := getUser(as.lg, tx, userName)
if user == nil {
if as.lg != nil {
as.lg.Warn("cannot find a user for permission check", zap.String("user-name", userName))
} else {
plog.Errorf("invalid user name %s for permission checking", userName)
}
return ErrPermissionDenied
}
// root role should have permission on all ranges
if hasRootRole(user) {
return nil
}
if as.isRangeOpPermitted(tx, userName, key, rangeEnd, permTyp) {
return nil
}
return ErrPermissionDenied
}
func (as *authStore) IsPutPermitted(authInfo *AuthInfo, key []byte) error {
return as.isOpPermitted(authInfo.Username, authInfo.Revision, key, nil, authpb.WRITE)
}
func (as *authStore) IsRangePermitted(authInfo *AuthInfo, key, rangeEnd []byte) error {
return as.isOpPermitted(authInfo.Username, authInfo.Revision, key, rangeEnd, authpb.READ)
}
func (as *authStore) IsDeleteRangePermitted(authInfo *AuthInfo, key, rangeEnd []byte) error {
return as.isOpPermitted(authInfo.Username, authInfo.Revision, key, rangeEnd, authpb.WRITE)
}
func (as *authStore) IsAdminPermitted(authInfo *AuthInfo) error {
if !as.IsAuthEnabled() {
return nil
}
if authInfo == nil {
return ErrUserEmpty
}
tx := as.be.BatchTx()
tx.Lock()
u := getUser(as.lg, tx, authInfo.Username)
tx.Unlock()
if u == nil {
return ErrUserNotFound
}
if !hasRootRole(u) {
return ErrPermissionDenied
}
return nil
}
func getUser(lg *zap.Logger, tx backend.BatchTx, username string) *authpb.User {
_, vs := tx.UnsafeRange(authUsersBucketName, []byte(username), nil, 0)
if len(vs) == 0 {
return nil
}
user := &authpb.User{}
err := user.Unmarshal(vs[0])
if err != nil {
if lg != nil {
lg.Panic(
"failed to unmarshal 'authpb.User'",
zap.String("user-name", username),
zap.Error(err),
)
} else {
plog.Panicf("failed to unmarshal user struct (name: %s): %s", username, err)
}
}
return user
}
func getAllUsers(lg *zap.Logger, tx backend.BatchTx) []*authpb.User {
_, vs := tx.UnsafeRange(authUsersBucketName, []byte{0}, []byte{0xff}, -1)
if len(vs) == 0 {
return nil
}
users := make([]*authpb.User, len(vs))
for i := range vs {
user := &authpb.User{}
err := user.Unmarshal(vs[i])
if err != nil {
if lg != nil {
lg.Panic("failed to unmarshal 'authpb.User'", zap.Error(err))
} else {
plog.Panicf("failed to unmarshal user struct: %s", err)
}
}
users[i] = user
}
return users
}
func putUser(lg *zap.Logger, tx backend.BatchTx, user *authpb.User) {
b, err := user.Marshal()
if err != nil {
if lg != nil {
lg.Panic("failed to unmarshal 'authpb.User'", zap.Error(err))
} else {
plog.Panicf("failed to marshal user struct (name: %s): %s", user.Name, err)
}
}
tx.UnsafePut(authUsersBucketName, user.Name, b)
}
func delUser(tx backend.BatchTx, username string) {
tx.UnsafeDelete(authUsersBucketName, []byte(username))
}
func getRole(tx backend.BatchTx, rolename string) *authpb.Role {
_, vs := tx.UnsafeRange(authRolesBucketName, []byte(rolename), nil, 0)
if len(vs) == 0 {
return nil
}
role := &authpb.Role{}
err := role.Unmarshal(vs[0])
if err != nil {
plog.Panicf("failed to unmarshal role struct (name: %s): %s", rolename, err)
}
return role
}
func getAllRoles(lg *zap.Logger, tx backend.BatchTx) []*authpb.Role {
_, vs := tx.UnsafeRange(authRolesBucketName, []byte{0}, []byte{0xff}, -1)
if len(vs) == 0 {
return nil
}
roles := make([]*authpb.Role, len(vs))
for i := range vs {
role := &authpb.Role{}
err := role.Unmarshal(vs[i])
if err != nil {
if lg != nil {
lg.Panic("failed to unmarshal 'authpb.Role'", zap.Error(err))
} else {
plog.Panicf("failed to unmarshal role struct: %s", err)
}
}
roles[i] = role
}
return roles
}
func putRole(lg *zap.Logger, tx backend.BatchTx, role *authpb.Role) {
b, err := role.Marshal()
if err != nil {
if lg != nil {
lg.Panic(
"failed to marshal 'authpb.Role'",
zap.String("role-name", string(role.Name)),
zap.Error(err),
)
} else {
plog.Panicf("failed to marshal role struct (name: %s): %s", role.Name, err)
}
}
tx.UnsafePut(authRolesBucketName, role.Name, b)
}
func delRole(tx backend.BatchTx, rolename string) {
tx.UnsafeDelete(authRolesBucketName, []byte(rolename))
}
func (as *authStore) IsAuthEnabled() bool {
as.enabledMu.RLock()
defer as.enabledMu.RUnlock()
return as.enabled
}
// NewAuthStore creates a new AuthStore.
func NewAuthStore(lg *zap.Logger, be backend.Backend, tp TokenProvider, bcryptCost int) *authStore {
if bcryptCost < bcrypt.MinCost || bcryptCost > bcrypt.MaxCost {
if lg != nil {
lg.Warn(
"use default bcrypt cost instead of the invalid given cost",
zap.Int("min-cost", bcrypt.MinCost),
zap.Int("max-cost", bcrypt.MaxCost),
zap.Int("default-cost", bcrypt.DefaultCost),
zap.Int("given-cost", bcryptCost))
} else {
plog.Warningf("Use default bcrypt-cost %d instead of the invalid value %d",
bcrypt.DefaultCost, bcryptCost)
}
bcryptCost = bcrypt.DefaultCost
}
tx := be.BatchTx()
tx.Lock()
tx.UnsafeCreateBucket(authBucketName)
tx.UnsafeCreateBucket(authUsersBucketName)
tx.UnsafeCreateBucket(authRolesBucketName)
enabled := false
_, vs := tx.UnsafeRange(authBucketName, enableFlagKey, nil, 0)
if len(vs) == 1 {
if bytes.Equal(vs[0], authEnabled) {
enabled = true
}
}
as := &authStore{
revision: getRevision(tx),
lg: lg,
be: be,
enabled: enabled,
rangePermCache: make(map[string]*unifiedRangePermissions),
tokenProvider: tp,
bcryptCost: bcryptCost,
}
if enabled {
as.tokenProvider.enable()
}
if as.Revision() == 0 {
as.commitRevision(tx)
}
tx.Unlock()
be.ForceCommit()
return as
}
func hasRootRole(u *authpb.User) bool {
// u.Roles is sorted in UserGrantRole(), so we can use binary search.
idx := sort.SearchStrings(u.Roles, rootRole)
return idx != len(u.Roles) && u.Roles[idx] == rootRole
}
func (as *authStore) commitRevision(tx backend.BatchTx) {
atomic.AddUint64(&as.revision, 1)
revBytes := make([]byte, revBytesLen)
binary.BigEndian.PutUint64(revBytes, as.Revision())
tx.UnsafePut(authBucketName, revisionKey, revBytes)
}
func getRevision(tx backend.BatchTx) uint64 {
_, vs := tx.UnsafeRange(authBucketName, revisionKey, nil, 0)
if len(vs) != 1 {
// this can happen in the initialization phase
return 0
}
return binary.BigEndian.Uint64(vs[0])
}
func (as *authStore) setRevision(rev uint64) {
atomic.StoreUint64(&as.revision, rev)
}
func (as *authStore) Revision() uint64 {
return atomic.LoadUint64(&as.revision)
}
func (as *authStore) AuthInfoFromTLS(ctx context.Context) (ai *AuthInfo) {
peer, ok := peer.FromContext(ctx)
if !ok || peer == nil || peer.AuthInfo == nil {
return nil
}
tlsInfo := peer.AuthInfo.(credentials.TLSInfo)
for _, chains := range tlsInfo.State.VerifiedChains {
if len(chains) < 1 {
continue
}
ai = &AuthInfo{
Username: chains[0].Subject.CommonName,
Revision: as.Revision(),
}
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil
}
// gRPC-gateway proxy request to etcd server includes Grpcgateway-Accept
// header. The proxy uses etcd client server certificate. If the certificate
// has a CommonName we should never use this for authentication.
if gw := md["grpcgateway-accept"]; len(gw) > 0 {
if as.lg != nil {
as.lg.Warn(
"ignoring common name in gRPC-gateway proxy request",
zap.String("common-name", ai.Username),
zap.String("user-name", ai.Username),
zap.Uint64("revision", ai.Revision),
)
} else {
plog.Warningf("ignoring common name in gRPC-gateway proxy request %s", ai.Username)
}
return nil
}
if as.lg != nil {
as.lg.Debug(
"found command name",
zap.String("common-name", ai.Username),
zap.String("user-name", ai.Username),
zap.Uint64("revision", ai.Revision),
)
} else {
plog.Debugf("found common name %s", ai.Username)
}
break
}
return ai
}
func (as *authStore) AuthInfoFromCtx(ctx context.Context) (*AuthInfo, error) {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return nil, nil
}
//TODO(mitake|hexfusion) review unifying key names
ts, ok := md[rpctypes.TokenFieldNameGRPC]
if !ok {
ts, ok = md[rpctypes.TokenFieldNameSwagger]
}
if !ok {
return nil, nil
}
token := ts[0]
authInfo, uok := as.authInfoFromToken(ctx, token)
if !uok {
if as.lg != nil {
as.lg.Warn("invalid auth token", zap.String("token", token))
} else {
plog.Warningf("invalid auth token: %s", token)
}
return nil, ErrInvalidAuthToken
}
return authInfo, nil
}
func (as *authStore) GenTokenPrefix() (string, error) {
return as.tokenProvider.genTokenPrefix()
}
func decomposeOpts(lg *zap.Logger, optstr string) (string, map[string]string, error) {
opts := strings.Split(optstr, ",")
tokenType := opts[0]
typeSpecificOpts := make(map[string]string)
for i := 1; i < len(opts); i++ {
pair := strings.Split(opts[i], "=")
if len(pair) != 2 {
if lg != nil {
lg.Warn("invalid token option", zap.String("option", optstr))
} else {
plog.Errorf("invalid token specific option: %s", optstr)
}
return "", nil, ErrInvalidAuthOpts
}
if _, ok := typeSpecificOpts[pair[0]]; ok {
if lg != nil {
lg.Warn(
"invalid token option",
zap.String("option", optstr),
zap.String("duplicate-parameter", pair[0]),
)
} else {
plog.Errorf("invalid token specific option, duplicated parameters (%s): %s", pair[0], optstr)
}
return "", nil, ErrInvalidAuthOpts
}
typeSpecificOpts[pair[0]] = pair[1]
}
return tokenType, typeSpecificOpts, nil
}
// NewTokenProvider creates a new token provider.
func NewTokenProvider(
lg *zap.Logger,
tokenOpts string,
indexWaiter func(uint64) <-chan struct{}) (TokenProvider, error) {
tokenType, typeSpecificOpts, err := decomposeOpts(lg, tokenOpts)
if err != nil {
return nil, ErrInvalidAuthOpts
}
switch tokenType {
case tokenTypeSimple:
if lg != nil {
lg.Warn("simple token is not cryptographically signed")
} else {
plog.Warningf("simple token is not cryptographically signed")
}
return newTokenProviderSimple(lg, indexWaiter), nil
case tokenTypeJWT:
return newTokenProviderJWT(lg, typeSpecificOpts)
case "":
return newTokenProviderNop()
default:
if lg != nil {
lg.Warn(
"unknown token type",
zap.String("type", tokenType),
zap.Error(ErrInvalidAuthOpts),
)
} else {
plog.Errorf("unknown token type: %s", tokenType)
}
return nil, ErrInvalidAuthOpts
}
}
func (as *authStore) WithRoot(ctx context.Context) context.Context {
if !as.IsAuthEnabled() {
return ctx
}
var ctxForAssign context.Context
if ts, ok := as.tokenProvider.(*tokenSimple); ok && ts != nil {
ctx1 := context.WithValue(ctx, AuthenticateParamIndex{}, uint64(0))
prefix, err := ts.genTokenPrefix()
if err != nil {
if as.lg != nil {
as.lg.Warn(
"failed to generate prefix of internally used token",
zap.Error(err),
)
} else {
plog.Errorf("failed to generate prefix of internally used token")
}
return ctx
}
ctxForAssign = context.WithValue(ctx1, AuthenticateParamSimpleTokenPrefix{}, prefix)
} else {
ctxForAssign = ctx
}
token, err := as.tokenProvider.assign(ctxForAssign, "root", as.Revision())
if err != nil {
// this must not happen
if as.lg != nil {
as.lg.Warn(
"failed to assign token for lease revoking",
zap.Error(err),
)
} else {
plog.Errorf("failed to assign token for lease revoking: %s", err)
}
return ctx
}
mdMap := map[string]string{
rpctypes.TokenFieldNameGRPC: token,
}
tokenMD := metadata.New(mdMap)
// use "mdIncomingKey{}" since it's called from local etcdserver
return metadata.NewIncomingContext(ctx, tokenMD)
}
func (as *authStore) HasRole(user, role string) bool {
tx := as.be.BatchTx()
tx.Lock()
u := getUser(as.lg, tx, user)
tx.Unlock()
if u == nil {
if as.lg != nil {
as.lg.Warn(
"'has-role' requested for non-existing user",
zap.String("user-name", user),
zap.String("role-name", role),
)
} else {
plog.Warningf("tried to check user %s has role %s, but user %s doesn't exist", user, role, user)
}
return false
}
for _, r := range u.Roles {
if role == r {
return true
}
}
return false
}
func (as *authStore) BcryptCost() int {
return as.bcryptCost
}