/
sign.go
96 lines (85 loc) · 3.47 KB
/
sign.go
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// beeper-imessage - A Matrix-iMessage puppeting bridge.
// Copyright (C) 2023 Beeper, Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package ids
import (
"bytes"
"crypto"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"encoding/base64"
"encoding/binary"
"fmt"
"net/http"
"github.com/beeper/imessage/imessage/direct/util/nonce"
)
type SigningPayload []byte
func (u *User) createSigningPayload(bagKey, queryString string, body []byte) SigningPayload {
payloadBuf := new(bytes.Buffer)
_ = binary.Write(payloadBuf, binary.BigEndian, uint32(len(bagKey)))
payloadBuf.WriteString(bagKey)
_ = binary.Write(payloadBuf, binary.BigEndian, uint32(len(queryString)))
payloadBuf.WriteString(queryString)
_ = binary.Write(payloadBuf, binary.BigEndian, uint32(len(body)))
payloadBuf.Write(body)
_ = binary.Write(payloadBuf, binary.BigEndian, uint32(len(u.PushToken)))
payloadBuf.Write(u.PushToken)
return payloadBuf.Bytes()
}
func (u *User) addPushHeaders(req *http.Request, payload SigningPayload) error {
n := nonce.Generate()
req.Header.Add("X-Push-Nonce", base64.StdEncoding.EncodeToString(n))
req.Header.Add("X-Push-Cert", base64.StdEncoding.EncodeToString(u.PushCert.Raw))
req.Header.Add("X-Push-Token", base64.StdEncoding.EncodeToString(u.PushToken))
sum := sha1.Sum(n.WrapPayload(payload))
signature, err := rsa.SignPKCS1v15(nil, u.PushKey, crypto.SHA1, sum[:])
if err != nil {
return err
}
req.Header.Add("X-Push-Sig", base64.StdEncoding.EncodeToString(append([]byte{0x01, 0x01}, signature...)))
return nil
}
func (u *User) signWithIdentity(headers map[string]string, payload SigningPayload, idCert *x509.Certificate) error {
if idCert == nil {
return fmt.Errorf("missing identity certificate")
}
n := nonce.Generate()
headers["X-ID-Nonce"] = base64.StdEncoding.EncodeToString(n)
headers["X-ID-Cert"] = base64.StdEncoding.EncodeToString(idCert.Raw)
headers["X-Push-Token"] = base64.StdEncoding.EncodeToString(u.PushToken)
sum := sha1.Sum(n.WrapPayload(payload))
signature, err := rsa.SignPKCS1v15(nil, u.AuthPrivateKey, crypto.SHA1, sum[:])
if err != nil {
return err
}
headers["X-ID-Sig"] = base64.StdEncoding.EncodeToString(append([]byte{0x01, 0x01}, signature...))
return nil
}
func (u *User) addAuthHeaders(req *http.Request, signingPayload SigningPayload, authSuffix string, authCert *x509.Certificate) error {
if authCert == nil {
return fmt.Errorf("missing auth certificate")
}
n := nonce.Generate()
req.Header.Add("X-Auth-Nonce"+authSuffix, base64.StdEncoding.EncodeToString(n))
req.Header.Add("X-Auth-Cert"+authSuffix, base64.StdEncoding.EncodeToString(authCert.Raw))
sum := sha1.Sum(n.WrapPayload(signingPayload))
signature, err := rsa.SignPKCS1v15(nil, u.AuthPrivateKey, crypto.SHA1, sum[:])
if err != nil {
return err
}
req.Header.Add("X-Auth-Sig"+authSuffix, base64.StdEncoding.EncodeToString(append([]byte{0x01, 0x01}, signature...)))
return nil
}