mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 12:46:46 +00:00
109 lines
3.2 KiB
Go
109 lines
3.2 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package smtp
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import (
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"encoding/base64"
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"regexp"
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pmcrypto "github.com/ProtonMail/gopenpgp/crypto"
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"github.com/ProtonMail/proton-bridge/pkg/pmapi"
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)
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//nolint:gochecknoglobals // Used like a constant
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var mailFormat = regexp.MustCompile(`.+@.+\..+`)
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// looksLikeEmail validates whether the string resembles an email.
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//
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// Notice that it does this naively by simply checking for the existence
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// of a DOT and an AT sign.
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func looksLikeEmail(e string) bool {
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return mailFormat.MatchString(e)
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}
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func createPackets(
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pubkey *pmcrypto.KeyRing,
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bodyKey *pmcrypto.SymmetricKey,
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attkeys map[string]*pmcrypto.SymmetricKey,
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) (bodyPacket string, attachmentPackets map[string]string, err error) {
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// Encrypt message body keys.
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packetBytes, err := pubkey.EncryptSessionKey(bodyKey)
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if err != nil {
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return
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}
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bodyPacket = base64.StdEncoding.EncodeToString(packetBytes)
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// Encrypt attachment keys.
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attachmentPackets = make(map[string]string)
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for id, attkey := range attkeys {
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var packets []byte
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if packets, err = pubkey.EncryptSessionKey(attkey); err != nil {
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return
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}
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attachmentPackets[id] = base64.StdEncoding.EncodeToString(packets)
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}
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return
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}
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func encryptSymmetric(
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kr *pmcrypto.KeyRing,
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textToEncrypt string,
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canonicalizeText bool, // nolint[unparam]
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) (key *pmcrypto.SymmetricKey, symEncryptedData []byte, err error) {
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// We use only primary key to encrypt the message. Our keyring contains all keys (primary, old and deacivated ones).
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pgpMessage, err := kr.FirstKey().Encrypt(pmcrypto.NewPlainMessageFromString(textToEncrypt), kr)
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if err != nil {
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return
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}
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pgpSplitMessage, err := pgpMessage.SeparateKeyAndData(len(textToEncrypt), 0)
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if err != nil {
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return
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}
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key, err = kr.DecryptSessionKey(pgpSplitMessage.GetBinaryKeyPacket())
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if err != nil {
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return
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}
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symEncryptedData = pgpSplitMessage.GetBinaryDataPacket()
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return
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}
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func buildPackage(
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addressMap map[string]*pmapi.MessageAddress,
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sharedScheme int,
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mimeType string,
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bodyData []byte,
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bodyKey *pmcrypto.SymmetricKey,
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attKeys map[string]pmapi.AlgoKey,
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) (pkg *pmapi.MessagePackage) {
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if len(addressMap) == 0 {
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return nil
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}
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pkg = &pmapi.MessagePackage{
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Body: base64.StdEncoding.EncodeToString(bodyData),
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Addresses: addressMap,
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MIMEType: mimeType,
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Type: sharedScheme,
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}
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if sharedScheme|pmapi.ClearPackage > 0 {
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pkg.BodyKey.Key = bodyKey.GetBase64Key()
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pkg.BodyKey.Algorithm = bodyKey.Algo
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pkg.AttachmentKeys = attKeys
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}
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return pkg
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}
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