We build too many walls and not enough bridges

2020-04-08 12:59:16 +02:00
commit 17f4d6097a
494 changed files with 62753 additions and 0 deletions
--- a/internal/smtp/utils.go
+++ b/internal/smtp/utils.go
@ -0,0 +1,96 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package smtp
+
+import (
+	"encoding/base64"
+
+	pmcrypto "github.com/ProtonMail/gopenpgp/crypto"
+	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
+)
+
+func createPackets(
+	pubkey *pmcrypto.KeyRing,
+	bodyKey *pmcrypto.SymmetricKey,
+	attkeys map[string]*pmcrypto.SymmetricKey,
+) (bodyPacket string, attachmentPackets map[string]string, err error) {
+	// Encrypt message body keys.
+	packetBytes, err := pubkey.EncryptSessionKey(bodyKey)
+	if err != nil {
+		return
+	}
+	bodyPacket = base64.StdEncoding.EncodeToString(packetBytes)
+
+	// Encrypt attachment keys.
+	attachmentPackets = make(map[string]string)
+	for id, attkey := range attkeys {
+		var packets []byte
+		if packets, err = pubkey.EncryptSessionKey(attkey); err != nil {
+			return
+		}
+		attachmentPackets[id] = base64.StdEncoding.EncodeToString(packets)
+	}
+	return
+}
+
+func encryptSymmetric(
+	kr *pmcrypto.KeyRing,
+	textToEncrypt string,
+	canonicalizeText bool, // nolint[unparam]
+) (key *pmcrypto.SymmetricKey, symEncryptedData []byte, err error) {
+	// We use only primary key to encrypt the message. Our keyring contains all keys (primary, old and deacivated ones).
+	pgpMessage, err := kr.FirstKey().Encrypt(pmcrypto.NewPlainMessageFromString(textToEncrypt), kr)
+	if err != nil {
+		return
+	}
+	pgpSplitMessage, err := pgpMessage.SeparateKeyAndData(len(textToEncrypt), 0)
+	if err != nil {
+		return
+	}
+	key, err = kr.DecryptSessionKey(pgpSplitMessage.GetBinaryKeyPacket())
+	if err != nil {
+		return
+	}
+	symEncryptedData = pgpSplitMessage.GetBinaryDataPacket()
+	return
+}
+
+func buildPackage(
+	addressMap map[string]*pmapi.MessageAddress,
+	sharedScheme int,
+	mimeType string,
+	bodyData []byte,
+	bodyKey *pmcrypto.SymmetricKey,
+	attKeys map[string]pmapi.AlgoKey,
+) (pkg *pmapi.MessagePackage) {
+	if len(addressMap) == 0 {
+		return nil
+	}
+	pkg = &pmapi.MessagePackage{
+		Body:      base64.StdEncoding.EncodeToString(bodyData),
+		Addresses: addressMap,
+		MIMEType:  mimeType,
+		Type:      sharedScheme,
+	}
+	if sharedScheme|pmapi.ClearPackage > 0 {
+		pkg.BodyKey.Key = bodyKey.GetBase64Key()
+		pkg.BodyKey.Algorithm = bodyKey.Algo
+		pkg.AttachmentKeys = attKeys
+	}
+	return pkg
+}