forked from mirror/jwt
Recommended changes from PR. Plus some documentation.
This commit is contained in:
Jamie Stackhouse
parent
3eddded2f3
commit
ec042acef7
267
jwt.go
267
jwt.go
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@ -1,6 +1,7 @@
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package jwt
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import (
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"crypto/subtle"
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"encoding/base64"
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"encoding/json"
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"net/http"
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@ -25,7 +26,8 @@ type Claims interface {
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Valid() error
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}
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// Structured version of Claims Section, as referenced at https://tools.ietf.org/html/rfc7519#section-4.1
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// Structured version of Claims Section, as referenced at
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// https://tools.ietf.org/html/rfc7519#section-4.1
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type StandardClaims struct {
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Audience string `json:"aud,omitempty"`
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ExpiresAt int64 `json:"exp,omitempty"`
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@ -36,138 +38,27 @@ type StandardClaims struct {
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Subject string `json:"sub,omitempty"`
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}
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// Validates time based claims "exp, iat, nbf".
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// There is no accounting for clock skew.
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// As well, if any of the above claims are not in the token, it will still
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// be considered a valid claim.
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func (c StandardClaims) Valid() error {
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vErr := new(ValidationError)
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now := TimeFunc().Unix()
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// The claims below are optional, so if they are set to the default value in Go, let's not
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// verify them.
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if c.ExpiresAt != 0 {
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if c.VerifyExpiresAt(now) == false {
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vErr.err = "Token is expired"
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vErr.Errors |= ValidationErrorExpired
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}
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}
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if c.IssuedAt != 0 {
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if c.VerifyIssuedAt(now) == false {
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vErr.err = "Token used before issued, clock skew issue?"
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vErr.Errors |= ValidationErrorIssuedAt
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}
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}
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if c.NotBefore != 0 {
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if c.VerifyNotBefore(now) == false {
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vErr.err = "Token is not valid yet"
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vErr.Errors |= ValidationErrorNotValidYet
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}
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}
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if vErr.valid() {
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return nil
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}
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return vErr
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}
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func (c *StandardClaims) VerifyAudience(cmp string) bool {
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return verifyAud(c.Audience, cmp)
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}
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func (c *StandardClaims) VerifyExpiresAt(cmp int64) bool {
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return verifyExp(c.ExpiresAt, cmp)
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}
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func (c *StandardClaims) VerifyIssuedAt(cmp int64) bool {
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return verifyIat(c.IssuedAt, cmp)
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}
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func (c *StandardClaims) VerifyIssuer(cmp string) bool {
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return verifyIss(c.Issuer, cmp)
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}
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func (c *StandardClaims) VerifyNotBefore(cmp int64) bool {
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return verifyNbf(c.NotBefore, cmp)
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}
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type MapClaim map[string]interface{}
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func (m MapClaim) VerifyAudience(cmp string) bool {
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val, exists := m["aud"]
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if !exists {
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return true // Don't fail validation if claim doesn't exist
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}
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if aud, ok := val.(string); ok {
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return verifyAud(aud, cmp)
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}
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return false
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}
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func (m MapClaim) VerifyExpiresAt(cmp int64) bool {
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val, exists := m["exp"]
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if !exists {
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return true
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}
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if exp, ok := val.(float64); ok {
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return verifyExp(int64(exp), cmp)
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}
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return false
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}
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func (m MapClaim) VerifyIssuedAt(cmp int64) bool {
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val, exists := m["iat"]
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if !exists {
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return true
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}
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if iat, ok := val.(float64); ok {
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return verifyIat(int64(iat), cmp)
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}
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return false
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}
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func (m MapClaim) VerifyIssuer(cmp string) bool {
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val, exists := m["iss"]
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if !exists {
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return true
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}
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if iss, ok := val.(string); ok {
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return verifyIss(iss, cmp)
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}
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return false
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}
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func (m MapClaim) VerifyNotBefore(cmp int64) bool {
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val, exists := m["nbf"]
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if !exists {
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return true
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}
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if nbf, ok := val.(float64); ok {
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return verifyNbf(int64(nbf), cmp)
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}
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return false
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}
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func (m MapClaim) Valid() error {
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vErr := new(ValidationError)
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now := TimeFunc().Unix()
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if m.VerifyExpiresAt(now) == false {
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// The claims below are optional, by default, so if they are set to the
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// default value in Go, let's not fail the verification for them.
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if c.VerifyExpiresAt(now, false) == false {
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vErr.err = "Token is expired"
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vErr.Errors |= ValidationErrorExpired
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}
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if m.VerifyIssuedAt(now) == false {
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if c.VerifyIssuedAt(now, false) == false {
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vErr.err = "Token used before issued, clock skew issue?"
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vErr.Errors |= ValidationErrorIssuedAt
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}
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if m.VerifyNotBefore(now) == false {
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if c.VerifyNotBefore(now, false) == false {
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vErr.err = "Token is not valid yet"
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vErr.Errors |= ValidationErrorNotValidYet
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}
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@ -179,23 +70,143 @@ func (m MapClaim) Valid() error {
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return vErr
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}
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func verifyAud(aud string, cmp string) bool {
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return aud == cmp
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// Compares the aud claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (c *StandardClaims) VerifyAudience(cmp string, req bool) bool {
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return verifyAud(c.Audience, cmp, req)
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}
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func verifyExp(exp int64, now int64) bool {
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// Compares the exp claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (c *StandardClaims) VerifyExpiresAt(cmp int64, req bool) bool {
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return verifyExp(c.ExpiresAt, cmp, req)
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}
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// Compares the iat claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (c *StandardClaims) VerifyIssuedAt(cmp int64, req bool) bool {
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return verifyIat(c.IssuedAt, cmp, req)
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}
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// Compares the iss claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (c *StandardClaims) VerifyIssuer(cmp string, req bool) bool {
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return verifyIss(c.Issuer, cmp, req)
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}
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// Compares the nbf claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (c *StandardClaims) VerifyNotBefore(cmp int64, req bool) bool {
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return verifyNbf(c.NotBefore, cmp, req)
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}
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type MapClaim map[string]interface{}
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// Compares the aud claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (m MapClaim) VerifyAudience(cmp string, req bool) bool {
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aud, _ := m["aud"].(string)
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return verifyAud(aud, cmp, req)
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}
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// Compares the exp claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (m MapClaim) VerifyExpiresAt(cmp int64, req bool) bool {
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exp, _ := m["exp"].(float64)
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return verifyExp(int64(exp), cmp, req)
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}
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// Compares the iat claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (m MapClaim) VerifyIssuedAt(cmp int64, req bool) bool {
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iat, _ := m["iat"].(float64)
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return verifyIat(int64(iat), cmp, req)
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}
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// Compares the iss claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (m MapClaim) VerifyIssuer(cmp string, req bool) bool {
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iss, _ := m["iss"].(string)
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return verifyIss(iss, cmp, req)
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}
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// Compares the nbf claim against cmp.
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// If required is false, this method will return true if the value matches or is unset
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func (m MapClaim) VerifyNotBefore(cmp int64, req bool) bool {
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nbf, _ := m["nbf"].(float64)
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return verifyNbf(int64(nbf), cmp, req)
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}
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// Validates time based claims "exp, iat, nbf".
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// There is no accounting for clock skew.
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// As well, if any of the above claims are not in the token, it will still
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// be considered a valid claim.
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func (m MapClaim) Valid() error {
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vErr := new(ValidationError)
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now := TimeFunc().Unix()
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if m.VerifyExpiresAt(now, false) == false {
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vErr.err = "Token is expired"
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vErr.Errors |= ValidationErrorExpired
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}
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if m.VerifyIssuedAt(now, false) == false {
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vErr.err = "Token used before issued, clock skew issue?"
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vErr.Errors |= ValidationErrorIssuedAt
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}
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if m.VerifyNotBefore(now, false) == false {
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vErr.err = "Token is not valid yet"
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vErr.Errors |= ValidationErrorNotValidYet
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}
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if vErr.valid() {
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return nil
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}
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return vErr
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}
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func verifyAud(aud string, cmp string, required bool) bool {
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if aud == "" {
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return !required
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}
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if subtle.ConstantTimeCompare([]byte(aud), []byte(cmp)) != 0 {
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return true
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} else {
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return false
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}
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}
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func verifyExp(exp int64, now int64, required bool) bool {
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if exp == 0 {
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return !required
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}
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return now <= exp
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}
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func verifyIat(iat int64, now int64) bool {
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func verifyIat(iat int64, now int64, required bool) bool {
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if iat == 0 {
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return !required
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}
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return now >= iat
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}
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func verifyIss(iss string, cmp string) bool {
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return iss == cmp
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func verifyIss(iss string, cmp string, required bool) bool {
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if iss == "" {
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return !required
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}
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if subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0 {
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return true
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} else {
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return false
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}
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}
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func verifyNbf(nbf int64, now int64) bool {
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func verifyNbf(nbf int64, now int64, required bool) bool {
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if nbf == 0 {
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return !required
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}
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return now >= nbf
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}
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