193 lines
6.7 KiB
Groff
193 lines
6.7 KiB
Groff
.\" Copyright (c) 1996-2000 Whistle Communications, Inc.
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.\" All rights reserved.
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.\"
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.\" Subject to the following obligations and disclaimer of warranty, use and
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.\" redistribution of this software, in source or object code forms, with or
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.\" without modifications are expressly permitted by Whistle Communications;
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.\" provided, however, that:
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.\" 1. Any and all reproductions of the source or object code must include the
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.\" copyright notice above and the following disclaimer of warranties; and
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.\" 2. No rights are granted, in any manner or form, to use Whistle
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.\" Communications, Inc. trademarks, including the mark "WHISTLE
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.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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.\" such appears in the above copyright notice or in the software.
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.\"
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.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.\" Author: Archie Cobbs <archie@FreeBSD.org>
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.\"
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.\" $Whistle: ng_mppc.8,v 1.1 1999/12/08 20:20:39 archie Exp $
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.\" $FreeBSD$
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.\"
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.Dd December 8, 1999
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.Dt NG_MPPC 4
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.Os FreeBSD
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.Sh NAME
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.Nm ng_mppc
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.Nd Microsoft MPPC/MPPE compression and encryption netgraph node type
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.Sh SYNOPSIS
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.Fd #include <netgraph/ng_mppc.h>
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.Sh DESCRIPTION
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The
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.Nm mppc
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node type implements the Microsoft Point-to-Point Compression (MPPC)
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and Microsoft Point-to-Point Encryption (MPPE) sub-protocols of
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the PPP protocol.
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These protocols are often used in conjunction with the Point-to-Point
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Tunneling Protocol (PPTP).
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.Pp
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The node has two hooks,
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.Dv "comp"
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for compression and
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.Dv "decomp"
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for decompression.
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Typically one or both of these hooks would be connected to the
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.Xr ng_ppp 4
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node type hook of the same name.
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Each direction of traffic flow is independent of the other.
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.Sh HOOKS
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This node type supports the following hooks:
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.Pp
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.Bl -tag -compact -width vjc_vjuncomp
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.It Dv comp
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Connection to
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.Xr ng_ppp 4
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.Dv "comp"
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hook.
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Incoming frames are compressed and/or encrypted, and sent
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back out the same hook.
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.It Dv decomp
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Connection to
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.Xr ng_ppp 4
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.Dv "decomp"
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hook.
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Incoming frames are decompressed and/or decrypted, and sent
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back out the same hook.
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.El
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.Sh CONTROL MESSAGES
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This node type supports the generic control messages, plus the following:
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.Bl -tag -width foo
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.It Dv NGM_MPPC_CONFIG_COMP
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This command resets and configures the node for a session in the
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outgoing traffic direction (i.e., for compression and/or encryption).
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This command takes a
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.Dv "struct ng_mppc_config"
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as an argument:
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.Bd -literal -offset 0
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/* Length of MPPE key */
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#define MPPE_KEY_LEN 16
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/* MPPC/MPPE PPP negotiation bits */
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#define MPPC_BIT 0x00000001 /* mppc compression bits */
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#define MPPE_40 0x00000020 /* use 40 bit key */
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#define MPPE_128 0x00000040 /* use 128 bit key */
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#define MPPE_BITS 0x00000060 /* mppe encryption bits */
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#define MPPE_STATELESS 0x01000000 /* use stateless mode */
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#define MPPC_VALID_BITS 0x01000061 /* possibly valid bits */
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/* Configuration for a session */
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struct ng_mppc_config {
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u_char enable; /* enable */
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u_int32_t bits; /* config bits */
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u_char startkey[MPPE_KEY_LEN]; /* start key */
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};
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.Ed
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The
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.Dv enabled
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field enables traffic flow through the node.
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The
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.Dv bits
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field contains the bits as negotiated by the Compression Control Protocol
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(CCP) in PPP.
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The
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.Dv startkey
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is only necessary if MPPE was negotiated, and must be equal to the
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session start key as defined for MPPE.
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This key is based on the MS-CHAP credentials used at link authentication time.
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.It Dv NGM_MPPC_CONFIG_DECOMP
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This command resets and configures the node for a session in the
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incoming traffic direction (i.e., for decompression and/or decryption).
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This command takes a
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.Dv "struct ng_mppc_config"
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as an argument.
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.It Dv NGM_MPPC_RESETREQ
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This message contains no arguments, and is bi-directional.
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If an error is detected during decompression, this message is sent by the
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node to the originator of the
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.Dv NGM_MPPC_CONFIG_DECOMP
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message that initiated the session.
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The receiver should respond by sending a PPP CCP Reset-Request to the peer.
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.Pp
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This message may also be received by this node type when a CCP Reset-Request
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is received by the local PPP entity.
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The node will respond by flushing its outgoing compression and encryption
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state so the remote side can resynchronize.
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.El
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.Sh SHUTDOWN
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This node shuts down upon receipt of a
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.Dv NGM_SHUTDOWN
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control message, or when both hooks have been disconnected.
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.Sh COMPILATION
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The kernel options
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.Dv NETGRAPH_MPPC_COMPRESSION
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and
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.Dv NETGRAPH_MPPC_ENCRYPTION
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are supplied to selectively compile in either or both capabilities.
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At least one of these must be defined, or else this node type is useless.
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.Pp
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The MPPC protocol requires proprietary compression code available
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from Hi/Fn (formerly STAC).
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These files must be obtained elsewhere and added to the kernel
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sources before this node type will compile with the
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.Dv NETGRAPH_MPPC_COMPRESSION
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option.
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.Sh BUGS
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In PPP, encryption should be handled by the Encryption Control Procotol (ECP)
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rather than CCP.
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However, Microsoft combined both compression and encryption into their
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``compression'' algorithm, which is confusing.
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.Sh SEE ALSO
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.Xr netgraph 4 ,
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.Xr ng_ppp 4 ,
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.Xr ngctl 8
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.Rs
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.%A G. Pall
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.%T "Microsoft Point-To-Point Compression (MPPC) Protocol"
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.%O RFC 2118
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.Re
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.Rs
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.%A G. S. Pall
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.%A G. Zorn
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.%T "Microsoft Point-To-Point Encryption (MPPE) Protocol"
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.%O draft-ietf-pppext-mppe-04.txt
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.Re
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.Rs
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.%A K. Hamzeh
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.%A G. Pall
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.%A W. Verthein
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.%A J. Taarud
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.%A W. Little
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.%A G. Zorn
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.%T "Point-to-Point Tunneling Protocol (PPTP)"
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.%O RFC 2637
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.Re
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.Sh AUTHORS
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Archie Cobbs <archie@FreeBSD.org>
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