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144 lines
3.4 KiB
Go
Executable file
144 lines
3.4 KiB
Go
Executable file
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ssh
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import (
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"fmt"
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"net"
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)
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// OpenChannelError is returned if the other side rejects an
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// OpenChannel request.
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type OpenChannelError struct {
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Reason RejectionReason
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Message string
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}
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func (e *OpenChannelError) Error() string {
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return fmt.Sprintf("ssh: rejected: %s (%s)", e.Reason, e.Message)
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}
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// ConnMetadata holds metadata for the connection.
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type ConnMetadata interface {
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// User returns the user ID for this connection.
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// It is empty if no authentication is used.
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User() string
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// SessionID returns the sesson hash, also denoted by H.
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SessionID() []byte
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// ClientVersion returns the client's version string as hashed
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// into the session ID.
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ClientVersion() []byte
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// ServerVersion returns the server's version string as hashed
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// into the session ID.
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ServerVersion() []byte
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// RemoteAddr returns the remote address for this connection.
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RemoteAddr() net.Addr
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// LocalAddr returns the local address for this connection.
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LocalAddr() net.Addr
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}
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// Conn represents an SSH connection for both server and client roles.
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// Conn is the basis for implementing an application layer, such
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// as ClientConn, which implements the traditional shell access for
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// clients.
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type Conn interface {
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ConnMetadata
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// SendRequest sends a global request, and returns the
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// reply. If wantReply is true, it returns the response status
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// and payload. See also RFC4254, section 4.
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SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error)
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// OpenChannel tries to open an channel. If the request is
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// rejected, it returns *OpenChannelError. On success it returns
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// the SSH Channel and a Go channel for incoming, out-of-band
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// requests. The Go channel must be serviced, or the
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// connection will hang.
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OpenChannel(name string, data []byte) (Channel, <-chan *Request, error)
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// Close closes the underlying network connection
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Close() error
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// Wait blocks until the connection has shut down, and returns the
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// error causing the shutdown.
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Wait() error
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// TODO(hanwen): consider exposing:
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// RequestKeyChange
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// Disconnect
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}
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// DiscardRequests consumes and rejects all requests from the
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// passed-in channel.
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func DiscardRequests(in <-chan *Request) {
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for req := range in {
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if req.WantReply {
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req.Reply(false, nil)
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}
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}
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}
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// A connection represents an incoming connection.
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type connection struct {
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transport *handshakeTransport
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sshConn
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// The connection protocol.
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*mux
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}
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func (c *connection) Close() error {
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return c.sshConn.conn.Close()
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}
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// sshconn provides net.Conn metadata, but disallows direct reads and
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// writes.
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type sshConn struct {
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conn net.Conn
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user string
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sessionID []byte
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clientVersion []byte
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serverVersion []byte
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}
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func dup(src []byte) []byte {
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dst := make([]byte, len(src))
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copy(dst, src)
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return dst
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}
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func (c *sshConn) User() string {
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return c.user
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}
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func (c *sshConn) RemoteAddr() net.Addr {
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return c.conn.RemoteAddr()
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}
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func (c *sshConn) Close() error {
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return c.conn.Close()
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}
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func (c *sshConn) LocalAddr() net.Addr {
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return c.conn.LocalAddr()
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}
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func (c *sshConn) SessionID() []byte {
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return dup(c.sessionID)
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}
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func (c *sshConn) ClientVersion() []byte {
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return dup(c.clientVersion)
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}
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func (c *sshConn) ServerVersion() []byte {
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return dup(c.serverVersion)
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}
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