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server.go
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server.go
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/*
This file is part of secretstream.
secretstream 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.
secretstream 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 secretstream. If not, see <http://www.gnu.org/licenses/>.
*/
package secretstream
import (
"net"
"strings"
"github.com/cryptix/secretstream/boxstream"
"github.com/cryptix/secretstream/secrethandshake"
)
// Server can create net.Listeners
type Server struct {
keyPair secrethandshake.EdKeyPair
appKey []byte
}
// NewServer returns a Server which uses the passed keyPair and appKey
func NewServer(keyPair secrethandshake.EdKeyPair, appKey []byte) (*Server, error) {
return &Server{keyPair: keyPair, appKey: appKey}, nil
}
// Listen opens a net.Listener which accepts only secrethandshake connections
func (s Server) Listen(n, a string) (net.Listener, error) {
if !strings.HasPrefix(n, "tcp") {
return nil, ErrOnlyTCP
}
l, err := net.Listen(n, a)
if err != nil {
return nil, err
}
return &Listener{l: l, s: &s}, nil
}
// ServerOnce wraps the passed net.Conn into a boxstream if the handshake is successful
func ServerOnce(conn net.Conn, secretKey secrethandshake.EdKeyPair, appKey []byte) (net.Conn, error) {
state, err := secrethandshake.NewServerState(appKey, secretKey)
if err != nil {
return nil, err
}
err = secrethandshake.Server(state, conn)
if err != nil {
return nil, err
}
enKey, enNonce := state.GetBoxstreamEncKeys()
deKey, deNonce := state.GetBoxstreamDecKeys()
remote := state.Remote()
boxed := Conn{
Reader: boxstream.NewUnboxer(conn, &deNonce, &deKey),
Writer: boxstream.NewBoxer(conn, &enNonce, &enKey),
conn: conn,
local: secretKey.Public[:],
remote: remote[:],
}
return boxed, nil
}