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feat: port clockskew support (#139) 

Co-authored-by: Kolawole Segun <Kolawole.Segun@kyndryl.com>
Co-authored-by: Christian Banse <oxisto@aybaze.com>
This commit is contained in:
ksegun 2022-03-08 01:43:46 -06:00 committed by GitHub
parent 6de17d3b3e
commit d489c99d3e
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 149 additions and 36 deletions
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66
claims.go
View File

@ -9,7 +9,10 @@ import (
// Claims must just have a Valid method that determines
// if the token is invalid for any supported reason
type Claims interface {
Valid() error
// Valid implements claim validation. The opts are function style options that can
// be used to fine-tune the validation. The type used for the options is intentionally
// un-exported, since its API and its naming is subject to change.
Valid(opts ...validationOption) error
}
// RegisteredClaims are a structured version of the JWT Claims Set,
@ -48,13 +51,13 @@ type RegisteredClaims struct {
// 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 RegisteredClaims) Valid() error {
func (c RegisteredClaims) Valid(opts ...validationOption) error {
vErr := new(ValidationError)
now := TimeFunc()
// 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) {
if !c.VerifyExpiresAt(now, false, opts...) {
delta := now.Sub(c.ExpiresAt.Time)
vErr.Inner = fmt.Errorf("%s by %s", ErrTokenExpired, delta)
vErr.Errors |= ValidationErrorExpired
@ -65,7 +68,7 @@ func (c RegisteredClaims) Valid() error {
vErr.Errors |= ValidationErrorIssuedAt
}
if !c.VerifyNotBefore(now, false) {
if !c.VerifyNotBefore(now, false, opts...) {
vErr.Inner = ErrTokenNotValidYet
vErr.Errors |= ValidationErrorNotValidYet
}
@ -85,12 +88,16 @@ func (c *RegisteredClaims) VerifyAudience(cmp string, req bool) bool {
// VerifyExpiresAt compares the exp claim against cmp (cmp < exp).
// If req is false, it will return true, if exp is unset.
func (c *RegisteredClaims) VerifyExpiresAt(cmp time.Time, req bool) bool {
func (c *RegisteredClaims) VerifyExpiresAt(cmp time.Time, req bool, opts ...validationOption) bool {
validator := validator{}
for _, o := range opts {
o(&validator)
}
if c.ExpiresAt == nil {
return verifyExp(nil, cmp, req)
return verifyExp(nil, cmp, req, validator.leeway)
}
return verifyExp(&c.ExpiresAt.Time, cmp, req)
return verifyExp(&c.ExpiresAt.Time, cmp, req, validator.leeway)
}
// VerifyIssuedAt compares the iat claim against cmp (cmp >= iat).
@ -105,12 +112,16 @@ func (c *RegisteredClaims) VerifyIssuedAt(cmp time.Time, req bool) bool {
// VerifyNotBefore compares the nbf claim against cmp (cmp >= nbf).
// If req is false, it will return true, if nbf is unset.
func (c *RegisteredClaims) VerifyNotBefore(cmp time.Time, req bool) bool {
func (c *RegisteredClaims) VerifyNotBefore(cmp time.Time, req bool, opts ...validationOption) bool {
validator := validator{}
for _, o := range opts {
o(&validator)
}
if c.NotBefore == nil {
return verifyNbf(nil, cmp, req)
return verifyNbf(nil, cmp, req, validator.leeway)
}
return verifyNbf(&c.NotBefore.Time, cmp, req)
return verifyNbf(&c.NotBefore.Time, cmp, req, validator.leeway)
}
// VerifyIssuer compares the iss claim against cmp.
@ -141,13 +152,13 @@ type StandardClaims struct {
// Valid 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 {
func (c StandardClaims) Valid(opts ...validationOption) 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) {
if !c.VerifyExpiresAt(now, false, opts...) {
delta := time.Unix(now, 0).Sub(time.Unix(c.ExpiresAt, 0))
vErr.Inner = fmt.Errorf("%s by %s", ErrTokenExpired, delta)
vErr.Errors |= ValidationErrorExpired
@ -158,7 +169,7 @@ func (c StandardClaims) Valid() error {
vErr.Errors |= ValidationErrorIssuedAt
}
if !c.VerifyNotBefore(now, false) {
if !c.VerifyNotBefore(now, false, opts...) {
vErr.Inner = ErrTokenNotValidYet
vErr.Errors |= ValidationErrorNotValidYet
}
@ -178,13 +189,17 @@ func (c *StandardClaims) VerifyAudience(cmp string, req bool) bool {
// VerifyExpiresAt compares the exp claim against cmp (cmp < exp).
// If req is false, it will return true, if exp is unset.
func (c *StandardClaims) VerifyExpiresAt(cmp int64, req bool) bool {
func (c *StandardClaims) VerifyExpiresAt(cmp int64, req bool, opts ...validationOption) bool {
validator := validator{}
for _, o := range opts {
o(&validator)
}
if c.ExpiresAt == 0 {
return verifyExp(nil, time.Unix(cmp, 0), req)
return verifyExp(nil, time.Unix(cmp, 0), req, validator.leeway)
}
t := time.Unix(c.ExpiresAt, 0)
return verifyExp(&t, time.Unix(cmp, 0), req)
return verifyExp(&t, time.Unix(cmp, 0), req, validator.leeway)
}
// VerifyIssuedAt compares the iat claim against cmp (cmp >= iat).
@ -200,13 +215,17 @@ func (c *StandardClaims) VerifyIssuedAt(cmp int64, req bool) bool {
// VerifyNotBefore compares the nbf claim against cmp (cmp >= nbf).
// If req is false, it will return true, if nbf is unset.
func (c *StandardClaims) VerifyNotBefore(cmp int64, req bool) bool {
func (c *StandardClaims) VerifyNotBefore(cmp int64, req bool, opts ...validationOption) bool {
validator := validator{}
for _, o := range opts {
o(&validator)
}
if c.NotBefore == 0 {
return verifyNbf(nil, time.Unix(cmp, 0), req)
return verifyNbf(nil, time.Unix(cmp, 0), req, validator.leeway)
}
t := time.Unix(c.NotBefore, 0)
return verifyNbf(&t, time.Unix(cmp, 0), req)
return verifyNbf(&t, time.Unix(cmp, 0), req, validator.leeway)
}
// VerifyIssuer compares the iss claim against cmp.
@ -240,11 +259,11 @@ func verifyAud(aud []string, cmp string, required bool) bool {
return result
}
func verifyExp(exp *time.Time, now time.Time, required bool) bool {
func verifyExp(exp *time.Time, now time.Time, required bool, skew time.Duration) bool {
if exp == nil {
return !required
}
return now.Before(*exp)
return now.Before((*exp).Add(+skew))
}
func verifyIat(iat *time.Time, now time.Time, required bool) bool {
@ -254,11 +273,12 @@ func verifyIat(iat *time.Time, now time.Time, required bool) bool {
return now.After(*iat) || now.Equal(*iat)
}
func verifyNbf(nbf *time.Time, now time.Time, required bool) bool {
func verifyNbf(nbf *time.Time, now time.Time, required bool, skew time.Duration) bool {
if nbf == nil {
return !required
}
return now.After(*nbf) || now.Equal(*nbf)
t := (*nbf).Add(-skew)
return now.After(t) || now.Equal(t)
}
func verifyIss(iss string, cmp string, required bool) bool {

32
map_claims.go
View File

@ -34,7 +34,7 @@ func (m MapClaims) VerifyAudience(cmp string, req bool) bool {
// VerifyExpiresAt compares the exp claim against cmp (cmp <= exp).
// If req is false, it will return true, if exp is unset.
func (m MapClaims) VerifyExpiresAt(cmp int64, req bool) bool {
func (m MapClaims) VerifyExpiresAt(cmp int64, req bool, opts ...validationOption) bool {
cmpTime := time.Unix(cmp, 0)
v, ok := m["exp"]
@ -42,17 +42,22 @@ func (m MapClaims) VerifyExpiresAt(cmp int64, req bool) bool {
return !req
}
validator := validator{}
for _, o := range opts {
o(&validator)
}
switch exp := v.(type) {
case float64:
if exp == 0 {
return verifyExp(nil, cmpTime, req)
return verifyExp(nil, cmpTime, req, validator.leeway)
}
return verifyExp(&newNumericDateFromSeconds(exp).Time, cmpTime, req)
return verifyExp(&newNumericDateFromSeconds(exp).Time, cmpTime, req, validator.leeway)
case json.Number:
v, _ := exp.Float64()
return verifyExp(&newNumericDateFromSeconds(v).Time, cmpTime, req)
return verifyExp(&newNumericDateFromSeconds(v).Time, cmpTime, req, validator.leeway)
}
return false
@ -86,7 +91,7 @@ func (m MapClaims) VerifyIssuedAt(cmp int64, req bool) bool {
// VerifyNotBefore compares the nbf claim against cmp (cmp >= nbf).
// If req is false, it will return true, if nbf is unset.
func (m MapClaims) VerifyNotBefore(cmp int64, req bool) bool {
func (m MapClaims) VerifyNotBefore(cmp int64, req bool, opts ...validationOption) bool {
cmpTime := time.Unix(cmp, 0)
v, ok := m["nbf"]
@ -94,17 +99,22 @@ func (m MapClaims) VerifyNotBefore(cmp int64, req bool) bool {
return !req
}
validator := validator{}
for _, o := range opts {
o(&validator)
}
switch nbf := v.(type) {
case float64:
if nbf == 0 {
return verifyNbf(nil, cmpTime, req)
return verifyNbf(nil, cmpTime, req, validator.leeway)
}
return verifyNbf(&newNumericDateFromSeconds(nbf).Time, cmpTime, req)
return verifyNbf(&newNumericDateFromSeconds(nbf).Time, cmpTime, req, validator.leeway)
case json.Number:
v, _ := nbf.Float64()
return verifyNbf(&newNumericDateFromSeconds(v).Time, cmpTime, req)
return verifyNbf(&newNumericDateFromSeconds(v).Time, cmpTime, req, validator.leeway)
}
return false
@ -121,11 +131,11 @@ func (m MapClaims) VerifyIssuer(cmp string, req bool) bool {
// 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 (m MapClaims) Valid() error {
func (m MapClaims) Valid(opts ...validationOption) error {
vErr := new(ValidationError)
now := TimeFunc().Unix()
if !m.VerifyExpiresAt(now, false) {
if !m.VerifyExpiresAt(now, false, opts...) {
// TODO(oxisto): this should be replaced with ErrTokenExpired
vErr.Inner = errors.New("Token is expired")
vErr.Errors |= ValidationErrorExpired
@ -137,7 +147,7 @@ func (m MapClaims) Valid() error {
vErr.Errors |= ValidationErrorIssuedAt
}
if !m.VerifyNotBefore(now, false) {
if !m.VerifyNotBefore(now, false, opts...) {
// TODO(oxisto): this should be replaced with ErrTokenNotValidYet
vErr.Inner = errors.New("Token is not valid yet")
vErr.Errors |= ValidationErrorNotValidYet

5
parser.go
View File

@ -22,6 +22,8 @@ type Parser struct {
//
// Deprecated: In future releases, this field will not be exported anymore and should be set with an option to NewParser instead.
SkipClaimsValidation bool
validationOptions []validationOption
}
// NewParser creates a new Parser with the specified options
@ -82,8 +84,7 @@ func (p *Parser) ParseWithClaims(tokenString string, claims Claims, keyFunc Keyf
// Validate Claims
if !p.SkipClaimsValidation {
if err := token.Claims.Valid(); err != nil {
if err := token.Claims.Valid(p.validationOptions...); err != nil {
// If the Claims Valid returned an error, check if it is a validation error,
// If it was another error type, create a ValidationError with a generic ClaimsInvalid flag set
if e, ok := err.(*ValidationError); !ok {

9
parser_option.go
View File

@ -1,5 +1,7 @@
package jwt
import "time"
// ParserOption is used to implement functional-style options that modify the behavior of the parser. To add
// new options, just create a function (ideally beginning with With or Without) that returns an anonymous function that
// takes a *Parser type as input and manipulates its configuration accordingly.
@ -27,3 +29,10 @@ func WithoutClaimsValidation() ParserOption {
p.SkipClaimsValidation = true
}
}
// WithLeeway returns the ParserOption for specifying the leeway window.
func WithLeeway(d time.Duration) ParserOption {
return func(p *Parser) {
p.validationOptions = append(p.validationOptions, withLeeway(d))
}
}

44
parser_test.go
View File

@ -78,6 +78,28 @@ var jwtTestData = []struct {
nil,
jwt.SigningMethodRS256,
},
{
"basic expired with 60s skew",
"", // autogen
defaultKeyFunc,
jwt.MapClaims{"foo": "bar", "exp": float64(time.Now().Unix() - 100)},
false,
jwt.ValidationErrorExpired,
[]error{jwt.ErrTokenExpired},
jwt.NewParser(jwt.WithLeeway(time.Minute)),
jwt.SigningMethodRS256,
},
{
"basic expired with 120s skew",
"", // autogen
defaultKeyFunc,
jwt.MapClaims{"foo": "bar", "exp": float64(time.Now().Unix() - 100)},
true,
0,
nil,
jwt.NewParser(jwt.WithLeeway(2 * time.Minute)),
jwt.SigningMethodRS256,
},
{
"basic nbf",
"", // autogen
@ -89,6 +111,28 @@ var jwtTestData = []struct {
nil,
jwt.SigningMethodRS256,
},
{
"basic nbf with 60s skew",
"", // autogen
defaultKeyFunc,
jwt.MapClaims{"foo": "bar", "nbf": float64(time.Now().Unix() + 100)},
false,
jwt.ValidationErrorNotValidYet,
[]error{jwt.ErrTokenNotValidYet},
jwt.NewParser(jwt.WithLeeway(time.Minute)),
jwt.SigningMethodRS256,
},
{
"basic nbf with 120s skew",
"", // autogen
defaultKeyFunc,
jwt.MapClaims{"foo": "bar", "nbf": float64(time.Now().Unix() + 100)},
true,
0,
nil,
jwt.NewParser(jwt.WithLeeway(2 * time.Minute)),
jwt.SigningMethodRS256,
},
{
"expired and nbf",
"", // autogen

29
validator_option.go Normal file
View File

@ -0,0 +1,29 @@
package jwt
import "time"
// validationOption is used to implement functional-style options that modify the behavior of the parser. To add
// new options, just create a function (ideally beginning with With or Without) that returns an anonymous function that
// takes a *validator type as input and manipulates its configuration accordingly.
//
// Note that this struct is (currently) un-exported, its naming is subject to change and will only be exported once
// the API is more stable.
type validationOption func(*validator)
// validator represents options that can be used for claims validation
//
// Note that this struct is (currently) un-exported, its naming is subject to change and will only be exported once
// the API is more stable.
type validator struct {
leeway time.Duration // Leeway to provide when validating time values
}
// withLeeway is an option to set the clock skew (leeway) window
//
// Note that this function is (currently) un-exported, its naming is subject to change and will only be exported once
// the API is more stable.
func withLeeway(d time.Duration) validationOption {
return func(v *validator) {
v.leeway = d
}
}