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// Copyright 2017 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 (
"context"
"crypto/ecdsa"
"crypto/rsa"
"errors"
"time"
"github.com/golang-jwt/jwt/v4"
"go.uber.org/zap"
)
type tokenJWT struct {
lg *zap.Logger
signMethod jwt.SigningMethod
key interface{}
ttl time.Duration
verifyOnly bool
}
func (t *tokenJWT) enable() {}
func (t *tokenJWT) disable() {}
func (t *tokenJWT) invalidateUser(string) {}
func (t *tokenJWT) genTokenPrefix() (string, error) { return "", nil }
func (t *tokenJWT) info(ctx context.Context, token string, rev uint64) (*AuthInfo, bool) {
// rev isn't used in JWT, it is only used in simple token
var (
username string
revision float64
)
parsed, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
if token.Method.Alg() != t.signMethod.Alg() {
return nil, errors.New("invalid signing method")
}
switch k := t.key.(type) {
case *rsa.PrivateKey:
return &k.PublicKey, nil
case *ecdsa.PrivateKey:
return &k.PublicKey, nil
default:
return t.key, nil
}
})
if err != nil {
t.lg.Warn(
"failed to parse a JWT token",
zap.String("token", token),
zap.Error(err),
)
return nil, false
}
claims, ok := parsed.Claims.(jwt.MapClaims)
if !parsed.Valid || !ok {
t.lg.Warn("invalid JWT token", zap.String("token", token))
return nil, false
}
username, ok = claims["username"].(string)
if !ok {
t.lg.Warn("failed to obtain user claims from jwt token")
return nil, false
}
revision, ok = claims["revision"].(float64)
if !ok {
t.lg.Warn("failed to obtain revision claims from jwt token")
return nil, false
}
return &AuthInfo{Username: username, Revision: uint64(revision)}, true
}
func (t *tokenJWT) assign(ctx context.Context, username string, revision uint64) (string, error) {
if t.verifyOnly {
return "", ErrVerifyOnly
}
// Future work: let a jwt token include permission information would be useful for
// permission checking in proxy side.
tk := jwt.NewWithClaims(t.signMethod,
jwt.MapClaims{
"username": username,
"revision": revision,
"exp": time.Now().Add(t.ttl).Unix(),
})
token, err := tk.SignedString(t.key)
if err != nil {
t.lg.Debug(
"failed to sign a JWT token",
zap.String("user-name", username),
zap.Uint64("revision", revision),
zap.Error(err),
)
return "", err
}
t.lg.Debug(
"created/assigned a new JWT token",
zap.String("user-name", username),
zap.Uint64("revision", revision),
zap.String("token", token),
)
return token, err
}
func newTokenProviderJWT(lg *zap.Logger, optMap map[string]string) (*tokenJWT, error) {
if lg == nil {
lg = zap.NewNop()
}
var err error
var opts jwtOptions
err = opts.ParseWithDefaults(optMap)
if err != nil {
lg.Error("problem loading JWT options", zap.Error(err))
return nil, ErrInvalidAuthOpts
}
var keys = make([]string, 0, len(optMap))
for k := range optMap {
if !knownOptions[k] {
keys = append(keys, k)
}
}
if len(keys) > 0 {
lg.Warn("unknown JWT options", zap.Strings("keys", keys))
}
key, err := opts.Key()
if err != nil {
return nil, err
}
t := &tokenJWT{
lg: lg,
ttl: opts.TTL,
signMethod: opts.SignMethod,
key: key,
}
switch t.signMethod.(type) {
case *jwt.SigningMethodECDSA:
if _, ok := t.key.(*ecdsa.PublicKey); ok {
t.verifyOnly = true
}
case *jwt.SigningMethodRSA, *jwt.SigningMethodRSAPSS:
if _, ok := t.key.(*rsa.PublicKey); ok {
t.verifyOnly = true
}
}
return t, nil
}
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