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token.go
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token.go
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/**
* Copyright 2021 Comcast Cable Communications Management, LLC
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package security
import (
"crypto/rsa"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"strings"
"time"
"github.com/rdkcentral/webconfig/common"
jwt "github.com/dgrijalva/jwt-go"
"github.com/go-akka/configuration"
"github.com/google/uuid"
)
const (
EncodingKeyId = "webconfig_key"
// sermo lib
JwtLibIdDefault = 2
)
type ThemisClaims struct {
KeyId string `json:"kid"`
Mac string `json:"mac"`
PartnerId string `json:"partner-id"`
Serial string `json:"serial"`
Trust string `json:"trust"`
Uuid string `json:"uuid"`
Capabilities []string `json:"capabilities"`
jwt.StandardClaims
}
type VerifyFunc func(map[string]*rsa.PublicKey, []string, []string, ...string) (bool, error)
type TokenManager struct {
encodeKey *rsa.PrivateKey
decodeKeys map[string]*rsa.PublicKey
apiKids []string
apiCapabilities []string
cpeKids []string
cpeCapabilities []string
verifyFn VerifyFunc
}
func NewTokenManager(conf *configuration.Config) *TokenManager {
// prepare args for TokenManager
privateKeyFile := conf.GetString(fmt.Sprintf("webconfig.jwt.kid.%s.private_key_file", EncodingKeyId))
kids := conf.GetNode("webconfig.jwt.kid").GetObject().GetKeys()
decodeKeys := map[string]*rsa.PublicKey{}
for _, kid := range kids {
keyfile := conf.GetString(fmt.Sprintf("webconfig.jwt.kid.%s.public_key_file", kid))
dk, err := loadDecodeKey(keyfile)
if err != nil {
panic(err)
}
decodeKeys[kid] = dk
}
fn := VerifyBySermo
// load the private encoding key
encodeKey, err := loadEncodeKey(privateKeyFile)
if err != nil {
panic(err)
}
// default to sermo_jose verifier
return &TokenManager{
encodeKey: encodeKey,
decodeKeys: decodeKeys,
apiKids: conf.GetStringList("webconfig.jwt.api_token.kids"),
apiCapabilities: conf.GetStringList("webconfig.jwt.api_token.capabilities"),
cpeKids: conf.GetStringList("webconfig.jwt.cpe_token.kids"),
cpeCapabilities: conf.GetStringList("webconfig.jwt.cpe_token.capabilities"),
verifyFn: fn,
}
}
func loadDecodeKey(keyfile string) (*rsa.PublicKey, error) {
kbytes, err := ioutil.ReadFile(keyfile)
if err != nil {
return nil, common.NewError(err)
}
decodeKey, err := jwt.ParseRSAPublicKeyFromPEM(kbytes)
if err != nil {
return decodeKey, common.NewError(err)
}
return decodeKey, nil
}
func loadEncodeKey(keyfile string) (*rsa.PrivateKey, error) {
kbytes, err := ioutil.ReadFile(keyfile)
if err != nil {
return nil, common.NewError(err)
}
encodeKey, err := jwt.ParseRSAPrivateKeyFromPEM(kbytes)
if err != nil {
return encodeKey, common.NewError(err)
}
return encodeKey, nil
}
func (m *TokenManager) Generate(mac string, ttl int64) string {
// %% NOTE mac should be lowercase to be consistent with reference doc
// static themis fields copied from examples in the webconfig confluence
kid := "webconfig_key"
serial := "ABCNDGE"
trust := "1000"
capUuid := "1234567891234"
utcnow := time.Now().Unix()
claims := ThemisClaims{
kid,
mac,
"comcast",
serial,
trust,
capUuid,
[]string{"x1:issuer:test:.*:all"},
jwt.StandardClaims{
Audience: "XMiDT",
ExpiresAt: utcnow + ttl,
Id: uuid.New().String(),
IssuedAt: utcnow,
Issuer: "themis",
NotBefore: utcnow,
Subject: "client:supplied",
},
}
method := jwt.GetSigningMethod("RS256")
token := jwt.NewWithClaims(method, claims)
// %% note the default Header is { "alg": "RS256", "typ": "JWT" }
if _, ok := token.Header["typ"]; ok {
delete(token.Header, "typ")
}
token.Header["kid"] = kid
var tokenString string
if signedString, err := token.SignedString(m.encodeKey); err == nil {
tokenString = signedString
}
return tokenString
}
func PaddingB64(input string) string {
output := input
switch len(input) % 4 {
case 2:
output += "=="
case 3:
output += "="
}
return output
}
func ParseKidFromTokenHeader(tokenString string) (string, error) {
elements := strings.Split(tokenString, ".")
if len(elements) != 3 {
return "", common.NewError(fmt.Errorf("illegal jwt token"))
}
var kid string
rbytes, err := base64.StdEncoding.DecodeString(PaddingB64(elements[0]))
if err != nil {
return kid, common.NewError(err)
}
headers := map[string]interface{}{}
if err := json.Unmarshal(rbytes, &headers); err != nil {
return kid, common.NewError(err)
}
rawKid, ok := headers["kid"]
if !ok {
return kid, common.NewError(common.NotOK)
}
kid, ok = rawKid.(string)
if !ok {
return kid, common.NewError(common.NotOK)
}
return kid, nil
}
func (m *TokenManager) VerifyApiToken(token string) (bool, error) {
return m.verifyFn(m.decodeKeys, m.apiKids, m.apiCapabilities, token)
}
func (m *TokenManager) VerifyCpeToken(token string, mac string) (bool, error) {
return m.verifyFn(m.decodeKeys, m.cpeKids, m.cpeCapabilities, token, mac)
}
func (m *TokenManager) SetVerifyFunc(fn VerifyFunc) {
m.verifyFn = fn
}