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241 lines (210 loc) · 5.75 KB
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/*
* Minio Cloud Storage, (C) 2018 Minio, Inc.
*
* 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 validator
import (
"crypto"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"net"
"net/http"
"os"
"strconv"
"time"
jwtgo "github.com/dgrijalva/jwt-go"
xnet "github.com/minio/minio/pkg/net"
)
// JWKSArgs - RSA authentication target arguments
type JWKSArgs struct {
URL *xnet.URL `json:"url"`
publicKeys map[string]crypto.PublicKey
}
// Validate JWT authentication target arguments
func (r *JWKSArgs) Validate() error {
return nil
}
// PopulatePublicKey - populates a new publickey from the JWKS URL.
func (r *JWKSArgs) PopulatePublicKey() error {
insecureClient := &http.Client{Transport: newCustomHTTPTransport(true)}
client := &http.Client{Transport: newCustomHTTPTransport(false)}
resp, err := client.Get(r.URL.String())
if err != nil {
resp, err = insecureClient.Get(r.URL.String())
if err != nil {
return err
}
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return errors.New(resp.Status)
}
var jwk JWKS
if err = json.NewDecoder(resp.Body).Decode(&jwk); err != nil {
return err
}
r.publicKeys = make(map[string]crypto.PublicKey)
for _, key := range jwk.Keys {
var publicKey crypto.PublicKey
publicKey, err = key.DecodePublicKey()
if err != nil {
return err
}
r.publicKeys[key.Kid] = publicKey
}
return nil
}
// UnmarshalJSON - decodes JSON data.
func (r *JWKSArgs) UnmarshalJSON(data []byte) error {
// subtype to avoid recursive call to UnmarshalJSON()
type subJWKSArgs JWKSArgs
var sr subJWKSArgs
// IAM related envs.
if jwksURL, ok := os.LookupEnv("MINIO_IAM_JWKS_URL"); ok {
u, err := xnet.ParseURL(jwksURL)
if err != nil {
return err
}
sr.URL = u
} else {
if err := json.Unmarshal(data, &sr); err != nil {
return err
}
}
ar := JWKSArgs(sr)
if ar.URL == nil || ar.URL.String() == "" {
*r = ar
return nil
}
if err := ar.Validate(); err != nil {
return err
}
if err := ar.PopulatePublicKey(); err != nil {
return err
}
*r = ar
return nil
}
// JWT - rs client grants provider details.
type JWT struct {
args JWKSArgs
}
func expToInt64(expI interface{}) (expAt int64, err error) {
switch exp := expI.(type) {
case float64:
expAt = int64(exp)
case int64:
expAt = exp
case json.Number:
expAt, err = exp.Int64()
if err != nil {
return 0, err
}
default:
return 0, ErrInvalidDuration
}
return expAt, nil
}
// GetDefaultExpiration - returns the expiration seconds expected.
func GetDefaultExpiration(dsecs string) (time.Duration, error) {
defaultExpiryDuration := time.Duration(60) * time.Minute // Defaults to 1hr.
if dsecs != "" {
expirySecs, err := strconv.ParseInt(dsecs, 10, 64)
if err != nil {
return 0, ErrInvalidDuration
}
// The duration, in seconds, of the role session.
// The value can range from 900 seconds (15 minutes)
// to 12 hours.
if expirySecs < 900 || expirySecs > 43200 {
return 0, ErrInvalidDuration
}
defaultExpiryDuration = time.Duration(expirySecs) * time.Second
}
return defaultExpiryDuration, nil
}
// newCustomHTTPTransport returns a new http configuration
// used while communicating with the cloud backends.
// This sets the value for MaxIdleConnsPerHost from 2 (go default)
// to 100.
func newCustomHTTPTransport(insecure bool) *http.Transport {
return &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
MaxIdleConns: 1024,
MaxIdleConnsPerHost: 1024,
IdleConnTimeout: 30 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
TLSClientConfig: &tls.Config{InsecureSkipVerify: insecure},
DisableCompression: true,
}
}
// Validate - validates the access token.
func (p *JWT) Validate(token, dsecs string) (map[string]interface{}, error) {
jp := new(jwtgo.Parser)
jp.ValidMethods = []string{"RS256", "RS384", "RS512", "ES256", "ES384", "ES512"}
keyFuncCallback := func(jwtToken *jwtgo.Token) (interface{}, error) {
kid, ok := jwtToken.Header["kid"].(string)
if !ok {
return nil, fmt.Errorf("Invalid kid value %v", jwtToken.Header["kid"])
}
return p.args.publicKeys[kid], nil
}
var claims jwtgo.MapClaims
jwtToken, err := jp.ParseWithClaims(token, &claims, keyFuncCallback)
if err != nil {
if err = p.args.PopulatePublicKey(); err != nil {
return nil, err
}
jwtToken, err = jwtgo.ParseWithClaims(token, &claims, keyFuncCallback)
if err != nil {
return nil, err
}
}
if !jwtToken.Valid {
return nil, ErrTokenExpired
}
expAt, err := expToInt64(claims["exp"])
if err != nil {
return nil, err
}
defaultExpiryDuration, err := GetDefaultExpiration(dsecs)
if err != nil {
return nil, err
}
if time.Unix(expAt, 0).UTC().Sub(time.Now().UTC()) < defaultExpiryDuration {
defaultExpiryDuration = time.Unix(expAt, 0).UTC().Sub(time.Now().UTC())
}
expiry := time.Now().UTC().Add(defaultExpiryDuration).Unix()
if expAt < expiry {
claims["exp"] = strconv.FormatInt(expAt, 64)
}
return claims, nil
}
// ID returns the provider name and authentication type.
func (p *JWT) ID() ID {
return "jwt"
}
// NewJWT - initialize new jwt authenticator.
func NewJWT(args JWKSArgs) *JWT {
return &JWT{
args: args,
}
}