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52 lines
1.6 KiB
52 lines
1.6 KiB
package jwt
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// Implements the none signing method. This is required by the spec
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// but you probably should never use it.
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var SigningMethodNone *signingMethodNone
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const UnsafeAllowNoneSignatureType unsafeNoneMagicConstant = "none signing method allowed"
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var NoneSignatureTypeDisallowedError error
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type signingMethodNone struct{}
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type unsafeNoneMagicConstant string
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func init() {
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SigningMethodNone = &signingMethodNone{}
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NoneSignatureTypeDisallowedError = NewValidationError("'none' signature type is not allowed", ValidationErrorSignatureInvalid)
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RegisterSigningMethod(SigningMethodNone.Alg(), func() SigningMethod {
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return SigningMethodNone
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})
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}
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func (m *signingMethodNone) Alg() string {
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return "none"
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}
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// Only allow 'none' alg type if UnsafeAllowNoneSignatureType is specified as the key
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func (m *signingMethodNone) Verify(signingString, signature string, key interface{}) (err error) {
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// Key must be UnsafeAllowNoneSignatureType to prevent accidentally
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// accepting 'none' signing method
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if _, ok := key.(unsafeNoneMagicConstant); !ok {
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return NoneSignatureTypeDisallowedError
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}
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// If signing method is none, signature must be an empty string
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if signature != "" {
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return NewValidationError(
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"'none' signing method with non-empty signature",
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ValidationErrorSignatureInvalid,
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)
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}
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// Accept 'none' signing method.
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return nil
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}
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// Only allow 'none' signing if UnsafeAllowNoneSignatureType is specified as the key
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func (m *signingMethodNone) Sign(signingString string, key interface{}) (string, error) {
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if _, ok := key.(unsafeNoneMagicConstant); ok {
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return "", nil
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}
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return "", NoneSignatureTypeDisallowedError
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}
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