/
auth.go
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/
auth.go
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/*
* Copyright (c) 2020, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* 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 (
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"time"
"github.com/lestrrat-go/jwx/jwa"
"github.com/lestrrat-go/jwx/jwt"
"github.com/wso2/product-microgateway/adapter/config"
"github.com/wso2/product-microgateway/adapter/internal/loggers"
stringutils "github.com/wso2/product-microgateway/adapter/internal/utils"
"github.com/wso2/product-microgateway/adapter/pkg/logging"
)
const (
usernameConst string = "username"
scopeConst string = "scope"
)
var storedPrivateKey *rsa.PrivateKey
var authTokenDuration *time.Duration
// ValidateCredentials checks whether the provided username and password are valid
func ValidateCredentials(username, password string, config *config.Config) bool {
for _, regUser := range config.Adapter.Server.Users {
if username == regUser.Username && password == regUser.Password {
return true
}
}
return false
}
func validateUser(username string, config *config.Config) bool {
for _, regUser := range config.Adapter.Server.Users {
if username == regUser.Username {
return true
}
}
return false
}
// Init prepares a private key to sign access tokens, and sets token duration
func Init() (err error) {
conf, _ := config.ReadConfigs()
if err = preparePrivateKey(conf); err != nil {
return err
}
setTokenDuration(conf)
return nil
}
func preparePrivateKey(conf *config.Config) (err error) {
byteArray, err := ioutil.ReadFile(conf.Adapter.Server.TokenPrivateKeyPath)
if err != nil {
return err
}
block, _ := pem.Decode(byteArray)
if block == nil {
return errors.New("No PEM formatted block found")
}
privateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
storedPrivateKey = privateKey.(*rsa.PrivateKey)
return err
}
func setTokenDuration(conf *config.Config) {
tokenDurationString := conf.Adapter.Server.TokenTTL
if tokenDurationString == "" {
loggers.LoggerAuth.Warn("Token duration not set. Set to default value: 1h")
tokenDurationString = "1h"
}
tokenDuration, err := time.ParseDuration(tokenDurationString)
if err != nil {
loggers.LoggerAuth.Warn("Error parsing configured token duration. Set to default value: 1h")
tokenDuration = time.Hour
}
if tokenDuration > 24*time.Hour {
loggers.LoggerAuth.Warn("Configured token duration is larger than 24hr. Set to max value: 24h")
tokenDuration = 24 * time.Hour
}
authTokenDuration = &tokenDuration
}
// GenerateToken generates an access token for the REST API
func GenerateToken(username string) (accessToken string, err error) {
privateKey, err := getPrivateKey()
if err != nil {
return "", err
}
var payload []byte
// Create signed payload
token := jwt.New()
token.Set(usernameConst, username)
token.Set(scopeConst, "admin")
expiresAt := time.Now().Add(*authTokenDuration)
token.Set(jwt.ExpirationKey, expiresAt)
payload, err = jwt.Sign(token, jwa.RS256, privateKey)
if err != nil {
loggers.LoggerAuth.ErrorC(logging.ErrorDetails{
Message: fmt.Sprintf("Failed to generate signed payload: %s", err.Error()),
Severity: logging.CRITICAL,
ErrorCode: 1300,
})
return "", err
}
// loggers.LoggerAuth.Infof("failed to generate signed payload: %s", payload)
// fmt.Printf(string(payload))
return string(payload), nil
}
// ValidateToken verifies the signature and validates the access token
func ValidateToken(accessToken string, resourceScopes []string, conf *config.Config) (
valid bool, err error) {
privateKey, err := getPrivateKey()
if err != nil {
loggers.LoggerAuth.ErrorC(logging.ErrorDetails{
Message: fmt.Sprintf("Failed to retrive private key: %s", err.Error()),
Severity: logging.MAJOR,
ErrorCode: 1301,
})
return false, err
}
token, err := jwt.ParseString(
accessToken,
jwt.WithValidate(true),
jwt.WithVerify(jwa.RS256, &privateKey.PublicKey),
)
if err != nil {
loggers.LoggerAPI.ErrorC(logging.ErrorDetails{
Message: fmt.Sprintf("Failed to parse JWT token: %s", err.Error()),
Severity: logging.MAJOR,
ErrorCode: 1302,
})
return false, nil
}
tokenUser, _ := token.Get(usernameConst)
if !validateUser(tokenUser.(string), conf) {
loggers.LoggerAPI.ErrorC(logging.ErrorDetails{
Message: "Invalid username in token.",
Severity: logging.MINOR,
ErrorCode: 1303,
})
return false, nil
}
tokenScope, _ := token.Get(scopeConst)
if !stringutils.StringInSlice(tokenScope.(string), resourceScopes) {
loggers.LoggerAPI.ErrorC(logging.ErrorDetails{
Message: "Invalid scope in token.",
Severity: logging.MINOR,
ErrorCode: 1304,
})
return false, nil
}
loggers.LoggerAPI.Info("Valid token recieved")
return true, nil
}
func getPrivateKey() (*rsa.PrivateKey, error) {
if storedPrivateKey != nil {
return storedPrivateKey, nil
}
return nil, errors.New("private key not present")
}