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jwt.go
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jwt.go
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/*
* Copyright (C) 2015-2018 Virgil Security Inc.
*
* Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* (1) Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* (2) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* (3) Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
package session
import (
"encoding/base64"
"encoding/json"
"strings"
"time"
"github.com/VirgilSecurity/virgil-sdk-go/v6/crypto"
"github.com/VirgilSecurity/virgil-sdk-go/v6/errors"
)
type Jwt struct {
BodyContent JwtBodyContent
HeaderContent JwtHeaderContent
Signature []byte
// signedToken and unsignedToken are updated when invoke Jwt.Sign
signedToken string
unsignedToken []byte
}
// NewJwt return new instance of Jwt
// Note: JwtBodyContent is huge params but it's never used other place
// nolint: gocritic
func NewJwt(header JwtHeaderContent, body JwtBodyContent) *Jwt {
jwt := &Jwt{
HeaderContent: header,
BodyContent: body,
}
return jwt
}
func JwtFromString(token string) (*Jwt, error) {
parts := strings.Split(token, ".")
if len(parts) != 3 {
return nil, errors.NewSDKError(ErrJWTParseFailed, "action", "JwtFromString")
}
header, err := base64.RawURLEncoding.DecodeString(parts[0])
if err != nil {
return nil, errors.NewSDKError(err, "action", "JwtFromString", "part", "header")
}
body, err := base64.RawURLEncoding.DecodeString(parts[1])
if err != nil {
return nil, errors.NewSDKError(err, "action", "JwtFromString", "part", "body")
}
signature, err := base64.RawURLEncoding.DecodeString(parts[2])
if err != nil {
return nil, errors.NewSDKError(err, "action", "JwtFromString", "part", "signature")
}
var headerContent JwtHeaderContent
if err := json.Unmarshal(header, &headerContent); err != nil {
return nil, errors.NewSDKError(err, "action", "JwtFromString", "part", "header")
}
var bodyContent JwtBodyContent
if err := json.Unmarshal(body, &bodyContent); err != nil {
return nil, errors.NewSDKError(err, "action", "JwtFromString", "part", "body")
}
if !strings.Contains(bodyContent.Issuer, IssuerPrefix) || !strings.Contains(bodyContent.Subject, IdentityPrefix) {
return nil, errors.NewSDKError(ErrJWTIncorrect, "action", "JwtFromString")
}
bodyContent.AppID = strings.TrimPrefix(bodyContent.Issuer, IssuerPrefix)
bodyContent.Identity = strings.TrimPrefix(bodyContent.Subject, IdentityPrefix)
return &Jwt{
BodyContent: bodyContent,
HeaderContent: headerContent,
Signature: signature,
signedToken: token,
unsignedToken: []byte(parts[0] + "." + parts[1]),
}, nil
}
func (j *Jwt) String() string {
return j.signedToken
}
func (j *Jwt) Identity() (string, error) {
return j.BodyContent.Identity, nil
}
func (j *Jwt) IsExpired() error {
return j.IsExpiredDelta(0)
}
//IsExpiredDelta returns error if token expires delta time before it's expiry date
func (j *Jwt) IsExpiredDelta(delta time.Duration) error {
exp := time.Unix(j.BodyContent.ExpiresAt, 0).Add(-delta)
now := time.Now()
if exp.Before(now) {
return ErrJWTExpired
}
return nil
}
func (j *Jwt) headerBase64() (string, error) {
headerBytes, err := json.Marshal(j.HeaderContent)
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(headerBytes), nil
}
func (j *Jwt) bodyBase64() (string, error) {
bodyBytes, err := json.Marshal(j.BodyContent)
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(bodyBytes), nil
}
func (j *Jwt) signatureBase64() string {
return base64.RawURLEncoding.EncodeToString(j.Signature)
}
func (j *Jwt) sign(c AccessTokenSigner, key crypto.PrivateKey) error {
h, err := j.headerBase64()
if err != nil {
return err
}
b, err := j.bodyBase64()
if err != nil {
return err
}
unsigned := h + "." + b
j.unsignedToken = []byte(unsigned)
sign, err := c.GenerateTokenSignature(j.unsignedToken, key)
if err != nil {
return err
}
j.Signature = sign
j.signedToken = unsigned + "." + j.signatureBase64()
return nil
}
func (j *Jwt) verify(c AccessTokenSigner, key crypto.PublicKey) error {
return c.VerifyTokenSignature(j.unsignedToken, j.Signature, key)
}
// jwt body prefixes
const (
IdentityPrefix = "identity-"
IssuerPrefix = "virgil-"
)
type JwtBodyContent struct {
AppID string `json:"-"`
Identity string `json:"-"`
Issuer string `json:"iss"`
Subject string `json:"sub"`
IssuedAt int64 `json:"iat"`
ExpiresAt int64 `json:"exp"`
AdditionalData map[string]interface{} `json:"ada,omitempty"`
}
// jwt header constant
const (
VirgilContentType = "virgil-jwt;v=1"
JwtType = "JWT"
)
type JwtHeaderContent struct {
Algorithm string `json:"alg"`
Type string `json:"typ"`
ContentType string `json:"cty"`
AppKeyID string `json:"kid"`
}