Esempio n. 1
0
// parseEncryptedFull parses a message in compact format.
func parseEncryptedFull(input string) (*JsonWebEncryption, error) {
	var parsed rawJsonWebEncryption
	err := json.Unmarshal([]byte(input), &parsed)
	if err != nil {
		return nil, err
	}

	return parsed.sanitized()
}
Esempio n. 2
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// parseSignedFull parses a message in full format.
func parseSignedFull(input string) (*JsonWebSignature, error) {
	var parsed rawJsonWebSignature
	err := json.Unmarshal([]byte(input), &parsed)
	if err != nil {
		return nil, err
	}

	return parsed.sanitized()
}
Esempio n. 3
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// UnmarshalJSON reads a key from its JSON representation.
func (k *JsonWebKey) UnmarshalJSON(data []byte) (err error) {
	var raw rawJsonWebKey
	err = json.Unmarshal(data, &raw)
	if err != nil {
		return err
	}

	var key interface{}
	switch raw.Kty {
	case "EC":
		if raw.D != nil {
			key, err = raw.ecPrivateKey()
		} else {
			key, err = raw.ecPublicKey()
		}
	case "RSA":
		if raw.D != nil {
			key, err = raw.rsaPrivateKey()
		} else {
			key, err = raw.rsaPublicKey()
		}
	case "oct":
		key, err = raw.symmetricKey()
	default:
		err = fmt.Errorf("square/go-jose: unknown json web key type '%s'", raw.Kty)
	}

	if err == nil {
		*k = JsonWebKey{Key: key, KeyID: raw.Kid, Algorithm: raw.Alg, Use: raw.Use}
	}

	k.Certificates = make([]*x509.Certificate, len(raw.X5c))
	for i, cert := range raw.X5c {
		raw, err := base64.StdEncoding.DecodeString(cert)
		if err != nil {
			return err
		}
		k.Certificates[i], err = x509.ParseCertificate(raw)
		if err != nil {
			return err
		}
	}

	return
}
Esempio n. 4
0
func (b *byteBuffer) UnmarshalJSON(data []byte) error {
	var encoded string
	err := json.Unmarshal(data, &encoded)
	if err != nil {
		return err
	}

	if encoded == "" {
		return nil
	}

	decoded, err := base64URLDecode(encoded)
	if err != nil {
		return err
	}

	*b = *newBuffer(decoded)

	return nil
}
Esempio n. 5
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// sanitized produces a cleaned-up JWE object from the raw JSON.
func (parsed *rawJsonWebEncryption) sanitized() (*JsonWebEncryption, error) {
	obj := &JsonWebEncryption{
		original:    parsed,
		unprotected: parsed.Unprotected,
	}

	// Check that there is not a nonce in the unprotected headers
	if (parsed.Unprotected != nil && parsed.Unprotected.Nonce != "") ||
		(parsed.Header != nil && parsed.Header.Nonce != "") {
		return nil, ErrUnprotectedNonce
	}

	if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
		err := json.Unmarshal(parsed.Protected.bytes(), &obj.protected)
		if err != nil {
			return nil, fmt.Errorf("square/go-jose: invalid protected header: %s, %s", err, parsed.Protected.base64())
		}
	}

	// Note: this must be called _after_ we parse the protected header,
	// otherwise fields from the protected header will not get picked up.
	obj.Header = obj.mergedHeaders(nil).sanitized()

	if len(parsed.Recipients) == 0 {
		obj.recipients = []recipientInfo{
			recipientInfo{
				header:       parsed.Header,
				encryptedKey: parsed.EncryptedKey.bytes(),
			},
		}
	} else {
		obj.recipients = make([]recipientInfo, len(parsed.Recipients))
		for r := range parsed.Recipients {
			encryptedKey, err := base64URLDecode(parsed.Recipients[r].EncryptedKey)
			if err != nil {
				return nil, err
			}

			// Check that there is not a nonce in the unprotected header
			if parsed.Recipients[r].Header != nil && parsed.Recipients[r].Header.Nonce != "" {
				return nil, ErrUnprotectedNonce
			}

			obj.recipients[r].header = parsed.Recipients[r].Header
			obj.recipients[r].encryptedKey = encryptedKey
		}
	}

	for _, recipient := range obj.recipients {
		headers := obj.mergedHeaders(&recipient)
		if headers.Alg == "" || headers.Enc == "" {
			return nil, fmt.Errorf("square/go-jose: message is missing alg/enc headers")
		}
	}

	obj.iv = parsed.Iv.bytes()
	obj.ciphertext = parsed.Ciphertext.bytes()
	obj.tag = parsed.Tag.bytes()
	obj.aad = parsed.Aad.bytes()

	return obj, nil
}
Esempio n. 6
0
// sanitized produces a cleaned-up JWS object from the raw JSON.
func (parsed *rawJsonWebSignature) sanitized() (*JsonWebSignature, error) {
	if parsed.Payload == nil {
		return nil, fmt.Errorf("square/go-jose: missing payload in JWS message")
	}

	obj := &JsonWebSignature{
		payload:    parsed.Payload.bytes(),
		Signatures: make([]Signature, len(parsed.Signatures)),
	}

	if len(parsed.Signatures) == 0 {
		// No signatures array, must be flattened serialization
		signature := Signature{}
		if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
			signature.protected = &rawHeader{}
			err := json.Unmarshal(parsed.Protected.bytes(), signature.protected)
			if err != nil {
				return nil, err
			}
		}

		if parsed.Header != nil && parsed.Header.Nonce != "" {
			return nil, ErrUnprotectedNonce
		}

		signature.header = parsed.Header
		signature.Signature = parsed.Signature.bytes()
		// Make a fake "original" rawSignatureInfo to store the unprocessed
		// Protected header. This is necessary because the Protected header can
		// contain arbitrary fields not registered as part of the spec. See
		// https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#section-4
		// If we unmarshal Protected into a rawHeader with its explicit list of fields,
		// we cannot marshal losslessly. So we have to keep around the original bytes.
		// This is used in computeAuthData, which will first attempt to use
		// the original bytes of a protected header, and fall back on marshaling the
		// header struct only if those bytes are not available.
		signature.original = &rawSignatureInfo{
			Protected: parsed.Protected,
			Header:    parsed.Header,
			Signature: parsed.Signature,
		}

		signature.Header = signature.mergedHeaders().sanitized()
		obj.Signatures = append(obj.Signatures, signature)
	}

	for i, sig := range parsed.Signatures {
		if sig.Protected != nil && len(sig.Protected.bytes()) > 0 {
			obj.Signatures[i].protected = &rawHeader{}
			err := json.Unmarshal(sig.Protected.bytes(), obj.Signatures[i].protected)
			if err != nil {
				return nil, err
			}
		}

		// Check that there is not a nonce in the unprotected header
		if sig.Header != nil && sig.Header.Nonce != "" {
			return nil, ErrUnprotectedNonce
		}

		obj.Signatures[i].Signature = sig.Signature.bytes()

		// Copy value of sig
		original := sig

		obj.Signatures[i].header = sig.Header
		obj.Signatures[i].original = &original
		obj.Signatures[i].Header = obj.Signatures[i].mergedHeaders().sanitized()
	}

	return obj, nil
}