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cloudkeys-go/vendor/golang.org/x/crypto/ssh/connection.go
Knut Ahlers a1df72edc5
Squashed commit of the following:
commit f0db1ff1f8
Author: Knut Ahlers <knut@ahlers.me>
Date:   Sun Dec 24 12:19:56 2017 +0100

    Mark option as deprecated

    Signed-off-by: Knut Ahlers <knut@ahlers.me>

commit 9891df2a16
Author: Knut Ahlers <knut@ahlers.me>
Date:   Sun Dec 24 12:11:56 2017 +0100

    Fix: Typo

    Signed-off-by: Knut Ahlers <knut@ahlers.me>

commit 836006de64
Author: Knut Ahlers <knut@ahlers.me>
Date:   Sun Dec 24 12:04:20 2017 +0100

    Add new dependencies

    Signed-off-by: Knut Ahlers <knut@ahlers.me>

commit d64fee60c8
Author: Knut Ahlers <knut@ahlers.me>
Date:   Sun Dec 24 11:55:52 2017 +0100

    Replace insecure password hashing

    Prior this commit passwords were hashed with a static salt and using the
    SHA1 hashing function. This could lead to passwords being attackable in
    case someone gets access to the raw data stored inside the database.
    This commit introduces password hashing using bcrypt hashing function
    which addresses this issue.

    Old passwords are not automatically re-hashed as they are unknown.
    Replacing the old password scheme is not that easy and needs #10 to be
    solved. Therefore the old hashing scheme is kept for compatibility
    reason.

    Signed-off-by: Knut Ahlers <knut@ahlers.me>

Signed-off-by: Knut Ahlers <knut@ahlers.me>

closes #14
closes #15
2017-12-24 19:44:24 +01:00

143 lines
3.3 KiB
Go

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ssh
import (
"fmt"
"net"
)
// OpenChannelError is returned if the other side rejects an
// OpenChannel request.
type OpenChannelError struct {
Reason RejectionReason
Message string
}
func (e *OpenChannelError) Error() string {
return fmt.Sprintf("ssh: rejected: %s (%s)", e.Reason, e.Message)
}
// ConnMetadata holds metadata for the connection.
type ConnMetadata interface {
// User returns the user ID for this connection.
User() string
// SessionID returns the session hash, also denoted by H.
SessionID() []byte
// ClientVersion returns the client's version string as hashed
// into the session ID.
ClientVersion() []byte
// ServerVersion returns the server's version string as hashed
// into the session ID.
ServerVersion() []byte
// RemoteAddr returns the remote address for this connection.
RemoteAddr() net.Addr
// LocalAddr returns the local address for this connection.
LocalAddr() net.Addr
}
// Conn represents an SSH connection for both server and client roles.
// Conn is the basis for implementing an application layer, such
// as ClientConn, which implements the traditional shell access for
// clients.
type Conn interface {
ConnMetadata
// SendRequest sends a global request, and returns the
// reply. If wantReply is true, it returns the response status
// and payload. See also RFC4254, section 4.
SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error)
// OpenChannel tries to open an channel. If the request is
// rejected, it returns *OpenChannelError. On success it returns
// the SSH Channel and a Go channel for incoming, out-of-band
// requests. The Go channel must be serviced, or the
// connection will hang.
OpenChannel(name string, data []byte) (Channel, <-chan *Request, error)
// Close closes the underlying network connection
Close() error
// Wait blocks until the connection has shut down, and returns the
// error causing the shutdown.
Wait() error
// TODO(hanwen): consider exposing:
// RequestKeyChange
// Disconnect
}
// DiscardRequests consumes and rejects all requests from the
// passed-in channel.
func DiscardRequests(in <-chan *Request) {
for req := range in {
if req.WantReply {
req.Reply(false, nil)
}
}
}
// A connection represents an incoming connection.
type connection struct {
transport *handshakeTransport
sshConn
// The connection protocol.
*mux
}
func (c *connection) Close() error {
return c.sshConn.conn.Close()
}
// sshconn provides net.Conn metadata, but disallows direct reads and
// writes.
type sshConn struct {
conn net.Conn
user string
sessionID []byte
clientVersion []byte
serverVersion []byte
}
func dup(src []byte) []byte {
dst := make([]byte, len(src))
copy(dst, src)
return dst
}
func (c *sshConn) User() string {
return c.user
}
func (c *sshConn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *sshConn) Close() error {
return c.conn.Close()
}
func (c *sshConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *sshConn) SessionID() []byte {
return dup(c.sessionID)
}
func (c *sshConn) ClientVersion() []byte {
return dup(c.clientVersion)
}
func (c *sshConn) ServerVersion() []byte {
return dup(c.serverVersion)
}