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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/rsa"
"io/ioutil"
jwt "github.com/dgrijalva/jwt-go"
)
type tokenJWT struct {
signMethod string
signKey *rsa.PrivateKey
verifyKey *rsa.PublicKey
}
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 uint64
)
parsed, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
return t.verifyKey, nil
})
switch err.(type) {
case nil:
if !parsed.Valid {
plog.Warningf("invalid jwt token: %s", token)
return nil, false
}
claims := parsed.Claims.(jwt.MapClaims)
username = claims["username"].(string)
revision = uint64(claims["revision"].(float64))
default:
plog.Warningf("failed to parse jwt token: %s", err)
return nil, false
}
return &AuthInfo{Username: username, Revision: revision}, true
}
func (t *tokenJWT) assign(ctx context.Context, username string, revision uint64) (string, error) {
// Future work: let a jwt token include permission information would be useful for
// permission checking in proxy side.
tk := jwt.NewWithClaims(jwt.GetSigningMethod(t.signMethod),
jwt.MapClaims{
"username": username,
"revision": revision,
})
token, err := tk.SignedString(t.signKey)
if err != nil {
plog.Debugf("failed to sign jwt token: %s", err)
return "", err
}
plog.Debugf("jwt token: %s", token)
return token, err
}
func prepareOpts(opts map[string]string) (jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath string, err error) {
for k, v := range opts {
switch k {
case "sign-method":
jwtSignMethod = v
case "pub-key":
jwtPubKeyPath = v
case "priv-key":
jwtPrivKeyPath = v
default:
plog.Errorf("unknown token specific option: %s", k)
return "", "", "", ErrInvalidAuthOpts
}
}
if len(jwtSignMethod) == 0 {
return "", "", "", ErrInvalidAuthOpts
}
return jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath, nil
}
func newTokenProviderJWT(opts map[string]string) (*tokenJWT, error) {
jwtSignMethod, jwtPubKeyPath, jwtPrivKeyPath, err := prepareOpts(opts)
if err != nil {
return nil, ErrInvalidAuthOpts
}
t := &tokenJWT{}
t.signMethod = jwtSignMethod
verifyBytes, err := ioutil.ReadFile(jwtPubKeyPath)
if err != nil {
plog.Errorf("failed to read public key (%s) for jwt: %s", jwtPubKeyPath, err)
return nil, err
}
t.verifyKey, err = jwt.ParseRSAPublicKeyFromPEM(verifyBytes)
if err != nil {
plog.Errorf("failed to parse public key (%s): %s", jwtPubKeyPath, err)
return nil, err
}
signBytes, err := ioutil.ReadFile(jwtPrivKeyPath)
if err != nil {
plog.Errorf("failed to read private key (%s) for jwt: %s", jwtPrivKeyPath, err)
return nil, err
}
t.signKey, err = jwt.ParseRSAPrivateKeyFromPEM(signBytes)
if err != nil {
plog.Errorf("failed to parse private key (%s): %s", jwtPrivKeyPath, err)
return nil, err
}
return t, nil
}
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