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// Copyright Martin Dosch.
// Use of this source code is governed by the BSD-2-clause
// license that can be found in the LICENSE file.
// TODO: Add more logging
package main
import (
"bytes"
"fmt"
"log/slog"
"strings"
"time"
"github.com/ProtonMail/gopenpgp/v3/crypto" // MIT License
"github.com/beevik/etree" // BSD-2-clause
"github.com/xmppo/go-xmpp" // BSD-3-Clause
)
func legacyPGPEncryptFile(oxPrivKey *crypto.Key, keyRing *crypto.KeyRing, file *bytes.Buffer) (encryptedFileBuffer *bytes.Buffer, err error) {
pgpEncrypt, err := crypto.PGP().Encryption().
Recipients(keyRing).
SigningKey(oxPrivKey).New()
if err != nil {
return
}
encryptedFile, err := pgpEncrypt.Encrypt(file.Bytes())
if err != nil {
return
}
encryptedFileArmored, err := encryptedFile.ArmorBytes()
if err != nil {
return
}
encryptedFileBuffer = bytes.NewBuffer(encryptedFileArmored)
return
}
func legacyPGPEncrypt(client *xmpp.Client, oxPrivKey *crypto.Key, recipient string, keyRing crypto.KeyRing, message string) (string, error) {
const statusOnline = "<status>Online</status>"
if message == "" {
return "", nil
}
ownJid := strings.Split(client.JID(), "/")[0]
if recipient != ownJid {
opk, err := oxPrivKey.GetPublicKey()
if err == nil {
ownKey, _ := crypto.NewKey(opk)
_ = keyRing.AddKey(ownKey)
}
}
legacyPGP := etree.NewDocument()
legacyPGP.WriteSettings.AttrSingleQuote = true
legacyPGPMsg := legacyPGP.CreateElement("message")
legacyPGPMsg.CreateAttr("to", recipient)
legacyPGPMsgBody := legacyPGPMsg.CreateElement("body")
legacyPGPMsgBody.CreateText("This message is encrypted using XEP-0027 PGP encryption.")
legacyPGPMsgX := legacyPGPMsg.CreateElement("x")
legacyPGPMsgX.CreateAttr("xmlns", nsJabberEncrypted)
legacyPGPMsgEnc := legacyPGPMsg.CreateElement("encryption")
legacyPGPMsgEnc.CreateAttr("namespace", nsJabberEncrypted)
legacyPGPMsgEnc.CreateAttr("xmlns", nsEme)
pgpEncrypt, err := crypto.PGP().Encryption().
Recipients(&keyRing).
SigningKey(oxPrivKey).New()
if err != nil {
return strError, fmt.Errorf("legacyPGPEncrypt: failed to create pgp encryption interface: %w", err)
}
pgpMessage, err := pgpEncrypt.Encrypt([]byte(message))
if err != nil {
return strError, fmt.Errorf("legacyPGPEncrypt: failed to create pgp message: %w", err)
}
pgpMessageArmored, err := pgpMessage.Armor()
pgpMessageArmored = strings.TrimPrefix(pgpMessageArmored, legacyPGPMsgBegin)
pgpMessageArmored = strings.TrimSuffix(pgpMessageArmored, legacyPGPMsgEnd)
if err != nil {
return strError, fmt.Errorf("legacyPGPEncrypt: failed to create pgp message: %w", err)
}
legacyPGPMsgX.CreateText(pgpMessageArmored)
lpm, err := legacyPGP.WriteToString()
if err != nil {
return strError, fmt.Errorf("legacyPGPEncrypt: failed to create xml for ox message: %w", err)
}
signer, err := crypto.PGP().Sign().SigningKey(oxPrivKey).Detached().New()
if err != nil {
return strError, err
}
signedStatusWithHeader, err := signer.Sign([]byte(statusOnline), crypto.Armor)
if err != nil {
return strError, err
}
signedStatus := strings.TrimPrefix(string(signedStatusWithHeader), legacyPGPSigBegin)
signedStatus = strings.TrimSuffix(signedStatus, legacyPGPSigEnd)
signedPresence := fmt.Sprintf("<presence to='%s' from='%s'>%s<x xmlns='%s'>%s</x></presence>",
recipient, ownJid, statusOnline, nsSigned, signedStatus)
_, err = client.SendOrg(signedPresence)
if err != nil {
return strError, err
}
return lpm, nil
}
func isLegacyPGPMsg(m xmpp.Chat) bool {
slog.Info("legacy pgp: checking pgp message")
for _, r := range m.OtherElem {
slog.Info("legacy pgp: checking for pgp message: comparing", "XMLNameSpace", r.XMLName.Space,
"LegacyPGPNameSpace", nsJabberEncrypted)
if r.XMLName.Space == nsJabberEncrypted {
slog.Info("legacy pgp: checking for pgp message:", "result", true)
return true
}
}
slog.Info("legacy pgp: checking for pgp message:", "result", false)
return false
}
func legacyPGPDecrypt(m xmpp.Chat, client *xmpp.Client, iqc chan xmpp.IQ, user string, oxPrivKey *crypto.Key) (string, time.Time, error) {
var legacyPGPMsg *crypto.PGPMessage
var err error
sender := strings.Split(m.Remote, "/")[0]
for _, r := range m.OtherElem {
if r.XMLName.Space == nsJabberEncrypted {
armored := legacyPGPMsgBegin +
r.InnerXML + legacyPGPMsgEnd
legacyPGPMsg, err = crypto.NewPGPMessageFromArmored(armored)
if err != nil {
return strError, time.Now(), err
}
break
}
}
if legacyPGPMsg == nil {
return strError, time.Now(), fmt.Errorf("legacypgp: could net unarmor pgp message")
}
keyRing, err := crypto.NewKeyRing(oxPrivKey)
if err != nil {
return strError, time.Now(), err
}
slog.Info("legacy pgp: decrypting: getting senders key", "sender", sender)
senderKeyRing, err := oxGetPublicKeyRing(client, iqc, sender)
if err != nil {
return strError, time.Now(), err
}
slog.Info("legacy pgp: decrypting message")
pgpDecrypt, err := crypto.PGP().Decryption().
DecryptionKeys(keyRing).
VerificationKeys(senderKeyRing).
New()
if err != nil {
return strError, time.Now(), err
}
decryptMsg, err := pgpDecrypt.Decrypt(legacyPGPMsg.Bytes(), crypto.Bytes)
if err != nil {
return strError, time.Now(), err
}
// Remove invalid code points.
slog.Info("legacy pgp: removing invalid code points from decrypted message")
message := validUTF8(decryptMsg.String())
return message, time.Now(), nil
}
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