mirror of
https://github.com/tailscale/tailscale.git
synced 2025-04-05 15:55:49 +00:00
2f98197857
This fork golang.org/x/crypto/ssh (at upstream x/crypto git rev e47973b1c1) into tailscale.com/tempfork/sshtest/ssh so we can hack up the client in weird ways to simulate other SSH clients seen in the wild. Two changes were made to the files when they were copied from x/crypto: * internal/poly1305 imports were replaced by the non-internal version; no code changes otherwise. It didn't need the internal one. * all decode-with-passphrase funcs were deleted, to avoid using the internal package x/crypto/ssh/internal/bcrypt_pbkdf Then the tests passed. Updates #14969 Change-Id: Ibf1abebfe608c75fef4da0255314f65e54ce5077 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
117 lines
2.9 KiB
Go
117 lines
2.9 KiB
Go
package ssh
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"net"
|
|
)
|
|
|
|
// streamLocalChannelOpenDirectMsg is a struct used for SSH_MSG_CHANNEL_OPEN message
|
|
// with "direct-streamlocal@openssh.com" string.
|
|
//
|
|
// See openssh-portable/PROTOCOL, section 2.4. connection: Unix domain socket forwarding
|
|
// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL#L235
|
|
type streamLocalChannelOpenDirectMsg struct {
|
|
socketPath string
|
|
reserved0 string
|
|
reserved1 uint32
|
|
}
|
|
|
|
// forwardedStreamLocalPayload is a struct used for SSH_MSG_CHANNEL_OPEN message
|
|
// with "forwarded-streamlocal@openssh.com" string.
|
|
type forwardedStreamLocalPayload struct {
|
|
SocketPath string
|
|
Reserved0 string
|
|
}
|
|
|
|
// streamLocalChannelForwardMsg is a struct used for SSH2_MSG_GLOBAL_REQUEST message
|
|
// with "streamlocal-forward@openssh.com"/"cancel-streamlocal-forward@openssh.com" string.
|
|
type streamLocalChannelForwardMsg struct {
|
|
socketPath string
|
|
}
|
|
|
|
// ListenUnix is similar to ListenTCP but uses a Unix domain socket.
|
|
func (c *Client) ListenUnix(socketPath string) (net.Listener, error) {
|
|
c.handleForwardsOnce.Do(c.handleForwards)
|
|
m := streamLocalChannelForwardMsg{
|
|
socketPath,
|
|
}
|
|
// send message
|
|
ok, _, err := c.SendRequest("streamlocal-forward@openssh.com", true, Marshal(&m))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if !ok {
|
|
return nil, errors.New("ssh: streamlocal-forward@openssh.com request denied by peer")
|
|
}
|
|
ch := c.forwards.add(&net.UnixAddr{Name: socketPath, Net: "unix"})
|
|
|
|
return &unixListener{socketPath, c, ch}, nil
|
|
}
|
|
|
|
func (c *Client) dialStreamLocal(socketPath string) (Channel, error) {
|
|
msg := streamLocalChannelOpenDirectMsg{
|
|
socketPath: socketPath,
|
|
}
|
|
ch, in, err := c.OpenChannel("direct-streamlocal@openssh.com", Marshal(&msg))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
go DiscardRequests(in)
|
|
return ch, err
|
|
}
|
|
|
|
type unixListener struct {
|
|
socketPath string
|
|
|
|
conn *Client
|
|
in <-chan forward
|
|
}
|
|
|
|
// Accept waits for and returns the next connection to the listener.
|
|
func (l *unixListener) Accept() (net.Conn, error) {
|
|
s, ok := <-l.in
|
|
if !ok {
|
|
return nil, io.EOF
|
|
}
|
|
ch, incoming, err := s.newCh.Accept()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
go DiscardRequests(incoming)
|
|
|
|
return &chanConn{
|
|
Channel: ch,
|
|
laddr: &net.UnixAddr{
|
|
Name: l.socketPath,
|
|
Net: "unix",
|
|
},
|
|
raddr: &net.UnixAddr{
|
|
Name: "@",
|
|
Net: "unix",
|
|
},
|
|
}, nil
|
|
}
|
|
|
|
// Close closes the listener.
|
|
func (l *unixListener) Close() error {
|
|
// this also closes the listener.
|
|
l.conn.forwards.remove(&net.UnixAddr{Name: l.socketPath, Net: "unix"})
|
|
m := streamLocalChannelForwardMsg{
|
|
l.socketPath,
|
|
}
|
|
ok, _, err := l.conn.SendRequest("cancel-streamlocal-forward@openssh.com", true, Marshal(&m))
|
|
if err == nil && !ok {
|
|
err = errors.New("ssh: cancel-streamlocal-forward@openssh.com failed")
|
|
}
|
|
return err
|
|
}
|
|
|
|
// Addr returns the listener's network address.
|
|
func (l *unixListener) Addr() net.Addr {
|
|
return &net.UnixAddr{
|
|
Name: l.socketPath,
|
|
Net: "unix",
|
|
}
|
|
}
|