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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
10BC8
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package jwt
// This file is a re-implementation of the original code here with some
// additional allocation tweaks reproduced using GODEBUG=allocfreetrace=1
// original file https://github.com/golang-jwt/jwt/blob/main/parser.go
// borrowed under MIT License https://github.com/golang-jwt/jwt/blob/main/LICENSE
import (
"bytes"
"crypto"
"crypto/hmac"
"encoding/base64"
"errors"
"fmt"
"hash"
"sync"
"time"
"github.com/buger/jsonparser"
jwtgo "github.com/golang-jwt/jwt/v4"
jsoniter "github.com/json-iterator/go"
)
// SigningMethodHMAC - Implements the HMAC-SHA family of signing methods signing methods
// Expects key type of []byte for both signing and validation
type SigningMethodHMAC struct {
Name string
Hash crypto.Hash
HasherPool sync.Pool
}
// Specific instances for HS256, HS384, HS512
var (
SigningMethodHS256 *SigningMethodHMAC
SigningMethodHS384 *SigningMethodHMAC
SigningMethodHS512 *SigningMethodHMAC
)
const base64BufferSize = 8192
var (
base64BufPool sync.Pool
hmacSigners []*SigningMethodHMAC
)
func init() {
base64BufPool = sync.Pool{
New: func() interface{} {
buf := make([]byte, base64BufferSize)
return &buf
},
}
hmacSigners = []*SigningMethodHMAC{
{Name: "HS256", Hash: crypto.SHA256},
{Name: "HS384", Hash: crypto.SHA384},
{Name: "HS512", Hash: crypto.SHA512},
}
for i := range hmacSigners {
h := hmacSigners[i].Hash
hmacSigners[i].HasherPool.New = func() interface{} {
return h.New()
}
}
}
// HashBorrower allows borrowing hashes and will keep track of them.
func (s *SigningMethodHMAC) HashBorrower() HashBorrower {
return HashBorrower{pool: &s.HasherPool, borrowed: make([]hash.Hash, 0, 2)}
}
// HashBorrower keeps track of borrowed hashers and allows to return them all.
type HashBorrower struct {
pool *sync.Pool
borrowed []hash.Hash
}
// Borrow a single hasher.
func (h *HashBorrower) Borrow() hash.Hash {
hasher := h.pool.Get().(hash.Hash)
h.borrowed = append(h.borrowed, hasher)
hasher.Reset()
return hasher
}
// ReturnAll will return all borrowed hashes.
func (h *HashBorrower) ReturnAll() {
for _, hasher := range h.borrowed {
h.pool.Put(hasher)
}
h.borrowed = nil
}
// StandardClaims are basically standard claims with "accessKey"
type StandardClaims struct {
AccessKey string `json:"accessKey,omitempty"`
jwtgo.StandardClaims
}
// UnmarshalJSON provides custom JSON unmarshal.
// This is mainly implemented for speed.
func (c *StandardClaims) UnmarshalJSON(b []byte) (err error) {
return jsonparser.ObjectEach(b, func(key []byte, value []byte, dataType jsonparser.ValueType, _ int) error {
if len(key) == 0 {
return nil
}
switch key[0] {
case 'a':
if string(key) == "accessKey" {
if dataType != jsonparser.String {
return errors.New("accessKey: Expected string")
}
c.AccessKey, err = jsonparser.ParseString(value)
return err
}
if string(key) == "aud" {
if dataType != jsonparser.String {
return errors.New("aud: Expected string")
}
c.Audience, err = jsonparser.ParseString(value)
return err
}
case 'e':
if string(key) == "exp" {
if dataType != jsonparser.Number {
return errors.New("exp: Expected number")
}
c.ExpiresAt, err = jsonparser.ParseInt(value)
return err
}
case 'i':
if string(key) == "iat" {
if dataType != jsonparser.Number {
return errors.New("exp: Expected number")
}
c.IssuedAt, err = jsonparser.ParseInt(value)
return err
}
if string(key) == "iss" {
if dataType != jsonparser.String {
return errors.New("iss: Expected string")
}
c.Issuer, err = jsonparser.ParseString(value)
return err
}
case 'n':
if string(key) == "nbf" {
if dataType != jsonparser.Number {
return errors.New("nbf: Expected number")
}
c.NotBefore, err = jsonparser.ParseInt(value)
return err
}
case 's':
if string(key) == "sub" {
if dataType != jsonparser.String {
return errors.New("sub: Expected string")
}
c.Subject, err = jsonparser.ParseString(value)
return err
}
}
// Ignore unknown fields
return nil
})
}
// MapClaims - implements custom unmarshaller
type MapClaims struct {
AccessKey string `json:"accessKey,omitempty"`
jwtgo.MapClaims
}
// GetAccessKey will return the access key.
// If nil an empty string will be returned.
func (c *MapClaims) GetAccessKey() string {
if c == nil {
return ""
}
return c.AccessKey
}
// NewStandardClaims - initializes standard claims
func NewStandardClaims() *StandardClaims {
return &StandardClaims{}
}
// SetIssuer sets issuer for these claims
func (c *StandardClaims) SetIssuer(issuer string) {
c.Issuer = issuer
}
// SetAudience sets audience for these claims
func (c *StandardClaims) SetAudience(aud string) {
c.Audience = aud
}
// SetExpiry sets expiry in unix epoch secs
func (c *StandardClaims) SetExpiry(t time.Time) {
c.ExpiresAt = t.Unix()
}
// SetAccessKey sets access key as jwt subject and custom
// "accessKey" field.
func (c *StandardClaims) SetAccessKey(accessKey string) {
c.Subject = accessKey
c.AccessKey = accessKey
}
// Valid - implements https://godoc.org/github.com/golang-jwt/jwt#Claims compatible
// claims interface, additionally validates "accessKey" fields.
func (c *StandardClaims) Valid() error {
if err := c.StandardClaims.Valid(); err != nil {
return err
}
if c.AccessKey == "" && c.Subject == "" {
return jwtgo.NewValidationError("accessKey/sub missing",
jwtgo.ValidationErrorClaimsInvalid)
}
return nil
}
// NewMapClaims - Initializes a new map claims
func NewMapClaims() *MapClaims {
return &MapClaims{MapClaims: jwtgo.MapClaims{}}
}
// Lookup returns the value and if the key is found.
func (c *MapClaims) Lookup(key string) (value string, ok bool) {
if c == nil {
return "", false
}
var vinterface interface{}
vinterface, ok = c.MapClaims[key]
if ok {
value, ok = vinterface.(string)
}
return
}
// SetExpiry sets expiry in unix epoch secs
func (c *MapClaims) SetExpiry(t time.Time) {
c.MapClaims["exp"] = t.Unix()
}
// SetAccessKey sets access key as jwt subject and custom
// "accessKey" field.
func (c *MapClaims) SetAccessKey(accessKey string) {
c.MapClaims["sub"] = accessKey
c.MapClaims["accessKey"] = accessKey
}
// Valid - implements https://godoc.org/github.com/golang-jwt/jwt#Claims compatible
// claims interface, additionally validates "accessKey" fields.
func (c *MapClaims) Valid() error {
if err := c.MapClaims.Valid(); err != nil {
return err
}
if c.AccessKey == "" {
return jwtgo.NewValidationError("accessKey/sub missing",
jwtgo.ValidationErrorClaimsInvalid)
}
return nil
}
// Map returns underlying low-level map claims.
func (c *MapClaims) Map() map[string]interface{} {
if c == nil {
return nil
}
return c.MapClaims
}
// MarshalJSON marshals the MapClaims struct
func (c *MapClaims) MarshalJSON() ([]byte, error) {
json := jsoniter.ConfigCompatibleWithStandardLibrary
return json.Marshal(c.MapClaims)
}
// ParseWithStandardClaims - parse the token string, valid methods.
func ParseWithStandardClaims(tokenStr string, claims *StandardClaims, key []byte) error {
// Key is not provided.
if key == nil {
// keyFunc was not provided, return error.
return jwtgo.NewValidationError("no key was provided.", jwtgo.ValidationErrorUnverifiable)
}
bufp := base64BufPool.Get().(*[]byte)
defer base64BufPool.Put(bufp)
tokenBuf := base64BufPool.Get().(*[]byte)
defer base64BufPool.Put(tokenBuf)
token := *tokenBuf
// Copy token to buffer, truncate to length.
token = token[:copy(token[:base64BufferSize], tokenStr)]
signer, err := ParseUnverifiedStandardClaims(token, claims, *bufp)
if err != nil {
return err
}
i := bytes.LastIndexByte(token, '.')
if i < 0 {
return jwtgo.ErrSignatureInvalid
}
n, err := base64DecodeBytes(token[i+1:], *bufp)
if err != nil {
return err
}
borrow := signer.HashBorrower()
hasher := hmac.New(borrow.Borrow, key)
hasher.Write(token[:i])
if !hmac.Equal((*bufp)[:n], hasher.Sum(nil)) {
borrow.ReturnAll()
return jwtgo.ErrSignatureInvalid
}
borrow.ReturnAll()
if claims.AccessKey == "" && claims.Subject == "" {
return jwtgo.NewValidationError("accessKey/sub missing",
jwtgo.ValidationErrorClaimsInvalid)
}
// Signature is valid, lets validate the claims for
// other fields such as expiry etc.
return claims.Valid()
}
// ParseUnverifiedStandardClaims - WARNING: Don't use this method unless you know what you're doing
//
// This method parses the token but doesn't validate the signature. It's only
// ever useful in cases where you know the signature is valid (because it has
// been checked previously in the stack) and you want to extract values from
// it.
func ParseUnverifiedStandardClaims(token []byte, claims *StandardClaims, buf []byte) (*SigningMethodHMAC, error) {
if bytes.Count(token, []byte(".")) != 2 {
return nil, jwtgo.ErrSignatureInvalid
}
i := bytes.IndexByte(token, '.')
j := bytes.LastIndexByte(token, '.')
n, err := base64DecodeBytes(token[:i], buf)
if err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
headerDec := buf[:n]
buf = buf[n:]
alg, _, _, err := jsonparser.Get(headerDec, "alg")
if err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
n, err = base64DecodeBytes(token[i+1:j], buf)
if err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
if err = claims.UnmarshalJSON(buf[:n]); err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
for _, signer := range hmacSigners {
if string(alg) == signer.Name {
return signer, nil
}
}
return nil, jwtgo.NewValidationError(fmt.Sprintf("signing method (%s) is unavailable.", string(alg)),
jwtgo.ValidationErrorUnverifiable)
}
// ParseWithClaims - parse the token string, valid methods.
func ParseWithClaims(tokenStr string, claims *MapClaims, fn func(*MapClaims) ([]byte, error)) error {
// Key lookup function has to be provided.
if fn == nil {
// keyFunc was not provided, return error.
return jwtgo.NewValidationError("no Keyfunc was provided.", jwtgo.ValidationErrorUnverifiable)
}
bufp := base64BufPool.Get().(*[]byte)
defer base64BufPool.Put(bufp)
tokenBuf := base64BufPool.Get().(*[]byte)
defer base64BufPool.Put(tokenBuf)
token := *tokenBuf
// Copy token to buffer, truncate to length.
token = token[:copy(token[:base64BufferSize], tokenStr)]
signer, err := ParseUnverifiedMapClaims(token, claims, *bufp)
if err != nil {
return err
}
i := bytes.LastIndexByte(token, '.')
if i < 0 {
return jwtgo.ErrSignatureInvalid
}
n, err := base64DecodeBytes(token[i+1:], *bufp)
if err != nil {
return err
}
var ok bool
claims.AccessKey, ok = claims.Lookup("accessKey")
if !ok {
claims.AccessKey, ok = claims.Lookup("sub")
if !ok {
return jwtgo.NewValidationError("accessKey/sub missing",
jwtgo.ValidationErrorClaimsInvalid)
}
}
// Lookup key from claims, claims may not be valid and may return
// invalid key which is okay as the signature verification will fail.
key, err := fn(claims)
if err != nil {
return err
}
borrow := signer.HashBorrower()
hasher := hmac.New(borrow.Borrow, key)
hasher.Write([]byte(tokenStr[:i]))
if !hmac.Equal((*bufp)[:n], hasher.Sum(nil)) {
borrow.ReturnAll()
return jwtgo.ErrSignatureInvalid
}
borrow.ReturnAll()
// Signature is valid, lets validate the claims for
// other fields such as expiry etc.
return claims.Valid()
}
// base64DecodeBytes returns the bytes represented by the base64 string s.
func base64DecodeBytes(b []byte, buf []byte) (int, error) {
return base64.RawURLEncoding.Decode(buf, b)
}
// ParseUnverifiedMapClaims - WARNING: Don't use this method unless you know what you're doing
//
// This method parses the token but doesn't validate the signature. It's only
// ever useful in cases where you know the signature is valid (because it has
// been checked previously in the stack) and you want to extract values from
// it.
func ParseUnverifiedMapClaims(token []byte, claims *MapClaims, buf []byte) (*SigningMethodHMAC, error) {
if bytes.Count(token, []byte(".")) != 2 {
return nil, jwtgo.ErrSignatureInvalid
}
i := bytes.IndexByte(token, '.')
j := bytes.LastIndexByte(token, '.')
n, err := base64DecodeBytes(token[:i], buf)
if err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
headerDec := buf[:n]
buf = buf[n:]
alg, _, _, err := jsonparser.Get(headerDec, "alg")
if err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
n, err = base64DecodeBytes(token[i+1:j], buf)
if err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err = json.Unmarshal(buf[:n], &claims.MapClaims); err != nil {
return nil, &jwtgo.ValidationError{Inner: err, Errors: jwtgo.ValidationErrorMalformed}
}
for _, signer := range hmacSigners {
if string(alg) == signer.Name {
return signer, nil
}
}
return nil, jwtgo.NewValidationError(fmt.Sprintf("signing method (%s) is unavailable.", string(alg)),
jwtgo.ValidationErrorUnverifiable)
}