mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 18:12:46 +00:00
fce3ba6382
Signed-off-by: kim (grufwub) <grufwub@gmail.com>
147 lines
3.9 KiB
Go
147 lines
3.9 KiB
Go
package jwt
|
|
|
|
import (
|
|
"crypto/subtle"
|
|
"fmt"
|
|
"time"
|
|
)
|
|
|
|
// For a type to be a Claims object, it must just have a Valid method that determines
|
|
// if the token is invalid for any supported reason
|
|
type Claims interface {
|
|
Valid() error
|
|
}
|
|
|
|
// Structured version of Claims Section, as referenced at
|
|
// https://tools.ietf.org/html/rfc7519#section-4.1
|
|
// See examples for how to use this with your own claim types
|
|
type StandardClaims struct {
|
|
Audience string `json:"aud,omitempty"`
|
|
ExpiresAt int64 `json:"exp,omitempty"`
|
|
Id string `json:"jti,omitempty"`
|
|
IssuedAt int64 `json:"iat,omitempty"`
|
|
Issuer string `json:"iss,omitempty"`
|
|
NotBefore int64 `json:"nbf,omitempty"`
|
|
Subject string `json:"sub,omitempty"`
|
|
}
|
|
|
|
// Validates time based claims "exp, iat, nbf".
|
|
// There is no accounting for clock skew.
|
|
// As well, if any of the above claims are not in the token, it will still
|
|
// be considered a valid claim.
|
|
func (c StandardClaims) Valid() error {
|
|
vErr := new(ValidationError)
|
|
now := TimeFunc().Unix()
|
|
|
|
// The claims below are optional, by default, so if they are set to the
|
|
// default value in Go, let's not fail the verification for them.
|
|
if !c.VerifyExpiresAt(now, false) {
|
|
delta := time.Unix(now, 0).Sub(time.Unix(c.ExpiresAt, 0))
|
|
vErr.Inner = fmt.Errorf("token is expired by %v", delta)
|
|
vErr.Errors |= ValidationErrorExpired
|
|
}
|
|
|
|
if !c.VerifyIssuedAt(now, false) {
|
|
vErr.Inner = fmt.Errorf("Token used before issued")
|
|
vErr.Errors |= ValidationErrorIssuedAt
|
|
}
|
|
|
|
if !c.VerifyNotBefore(now, false) {
|
|
vErr.Inner = fmt.Errorf("token is not valid yet")
|
|
vErr.Errors |= ValidationErrorNotValidYet
|
|
}
|
|
|
|
if vErr.valid() {
|
|
return nil
|
|
}
|
|
|
|
return vErr
|
|
}
|
|
|
|
// Compares the aud claim against cmp.
|
|
// If required is false, this method will return true if the value matches or is unset
|
|
func (c *StandardClaims) VerifyAudience(cmp string, req bool) bool {
|
|
return verifyAud([]string{c.Audience}, cmp, req)
|
|
}
|
|
|
|
// Compares the exp claim against cmp.
|
|
// If required is false, this method will return true if the value matches or is unset
|
|
func (c *StandardClaims) VerifyExpiresAt(cmp int64, req bool) bool {
|
|
return verifyExp(c.ExpiresAt, cmp, req)
|
|
}
|
|
|
|
// Compares the iat claim against cmp.
|
|
// If required is false, this method will return true if the value matches or is unset
|
|
func (c *StandardClaims) VerifyIssuedAt(cmp int64, req bool) bool {
|
|
return verifyIat(c.IssuedAt, cmp, req)
|
|
}
|
|
|
|
// Compares the iss claim against cmp.
|
|
// If required is false, this method will return true if the value matches or is unset
|
|
func (c *StandardClaims) VerifyIssuer(cmp string, req bool) bool {
|
|
return verifyIss(c.Issuer, cmp, req)
|
|
}
|
|
|
|
// Compares the nbf claim against cmp.
|
|
// If required is false, this method will return true if the value matches or is unset
|
|
func (c *StandardClaims) VerifyNotBefore(cmp int64, req bool) bool {
|
|
return verifyNbf(c.NotBefore, cmp, req)
|
|
}
|
|
|
|
// ----- helpers
|
|
|
|
func verifyAud(aud []string, cmp string, required bool) bool {
|
|
if len(aud) == 0 {
|
|
return !required
|
|
}
|
|
// use a var here to keep constant time compare when looping over a number of claims
|
|
result := false
|
|
|
|
var stringClaims string
|
|
for _, a := range aud {
|
|
if subtle.ConstantTimeCompare([]byte(a), []byte(cmp)) != 0 {
|
|
result = true
|
|
}
|
|
stringClaims = stringClaims + a
|
|
}
|
|
|
|
// case where "" is sent in one or many aud claims
|
|
if len(stringClaims) == 0 {
|
|
return !required
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
func verifyExp(exp int64, now int64, required bool) bool {
|
|
if exp == 0 {
|
|
return !required
|
|
}
|
|
return now <= exp
|
|
}
|
|
|
|
func verifyIat(iat int64, now int64, required bool) bool {
|
|
if iat == 0 {
|
|
return !required
|
|
}
|
|
return now >= iat
|
|
}
|
|
|
|
func verifyIss(iss string, cmp string, required bool) bool {
|
|
if iss == "" {
|
|
return !required
|
|
}
|
|
if subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0 {
|
|
return true
|
|
} else {
|
|
return false
|
|
}
|
|
}
|
|
|
|
func verifyNbf(nbf int64, now int64, required bool) bool {
|
|
if nbf == 0 {
|
|
return !required
|
|
}
|
|
return now >= nbf
|
|
}
|