[PPP]: add PPP MPPE encryption module
From: Matt Domsch <Matt_Domsch@dell.com> The patch below implements the Microsoft Point-to-Point Encryption method as a PPP compressor/decompressor. This is necessary for Linux clients and servers to interoperate with Microsoft Point-to-Point Tunneling Protocol (PPTP) servers (either Microsoft PPTP servers or the poptop project) which use MPPE to encrypt data when creating a VPN. This patch differs from the kernel_ppp_mppe DKMS pacakge at pptpclient.sourceforge.net by utilizing the kernel crypto routines rather than providing its own SHA1 and arcfour implementations. Minor changes to ppp_generic.c try to prevent a link from disabling compression (in our case, the encryption) after it has started using compression (encryption). Feedback to <pptpclient-devel@lists.sourceforge.net> please. Signed-off-by: Matt Domsch <Matt_Domsch@dell.com> Cc: James Cameron <james.cameron@hp.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Brice Goglin <Brice.Goglin@ens-lyon.org> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matt Domsch
David S. Miller
Родитель
6722e78c90
Коммит
b3f9b92a6e
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@ -2523,6 +2523,19 @@ config PPP_BSDCOMP
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module; it is called bsd_comp and will show up in the directory
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modules once you have said "make modules". If unsure, say N.
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config PPP_MPPE
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tristate "PPP MPPE compression (encryption) (EXPERIMENTAL)"
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depends on PPP && EXPERIMENTAL
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select CRYPTO
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select CRYPTO_SHA1
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select CRYPTO_ARC4
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---help---
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Support for the MPPE Encryption protocol, as employed by the
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Microsoft Point-to-Point Tunneling Protocol.
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See http://pptpclient.sourceforge.net/ for information on
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configuring PPTP clients and servers to utilize this method.
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config PPPOE
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tristate "PPP over Ethernet (EXPERIMENTAL)"
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depends on EXPERIMENTAL && PPP
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@ -112,6 +112,7 @@ obj-$(CONFIG_PPP_ASYNC) += ppp_async.o
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obj-$(CONFIG_PPP_SYNC_TTY) += ppp_synctty.o
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obj-$(CONFIG_PPP_DEFLATE) += ppp_deflate.o
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obj-$(CONFIG_PPP_BSDCOMP) += bsd_comp.o
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obj-$(CONFIG_PPP_MPPE) += ppp_mppe.o
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obj-$(CONFIG_PPPOE) += pppox.o pppoe.o
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obj-$(CONFIG_SLIP) += slip.o
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@ -137,13 +137,14 @@ struct ppp {
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/*
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* Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC,
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* SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP.
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* SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP,
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* SC_MUST_COMP
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* Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR.
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* Bits in xstate: SC_COMP_RUN
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*/
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#define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \
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|SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \
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|SC_COMP_TCP|SC_REJ_COMP_TCP)
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|SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP)
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/*
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* Private data structure for each channel.
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@ -1027,6 +1028,56 @@ ppp_xmit_process(struct ppp *ppp)
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ppp_xmit_unlock(ppp);
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}
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static inline struct sk_buff *
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pad_compress_skb(struct ppp *ppp, struct sk_buff *skb)
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{
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struct sk_buff *new_skb;
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int len;
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int new_skb_size = ppp->dev->mtu +
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ppp->xcomp->comp_extra + ppp->dev->hard_header_len;
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int compressor_skb_size = ppp->dev->mtu +
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ppp->xcomp->comp_extra + PPP_HDRLEN;
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new_skb = alloc_skb(new_skb_size, GFP_ATOMIC);
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if (!new_skb) {
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if (net_ratelimit())
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printk(KERN_ERR "PPP: no memory (comp pkt)\n");
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return NULL;
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}
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if (ppp->dev->hard_header_len > PPP_HDRLEN)
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skb_reserve(new_skb,
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ppp->dev->hard_header_len - PPP_HDRLEN);
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/* compressor still expects A/C bytes in hdr */
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len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
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new_skb->data, skb->len + 2,
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compressor_skb_size);
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if (len > 0 && (ppp->flags & SC_CCP_UP)) {
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kfree_skb(skb);
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skb = new_skb;
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skb_put(skb, len);
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skb_pull(skb, 2); /* pull off A/C bytes */
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} else if (len == 0) {
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/* didn't compress, or CCP not up yet */
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kfree_skb(new_skb);
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new_skb = skb;
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} else {
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/*
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* (len < 0)
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* MPPE requires that we do not send unencrypted
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* frames. The compressor will return -1 if we
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* should drop the frame. We cannot simply test
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* the compress_proto because MPPE and MPPC share
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* the same number.
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*/
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if (net_ratelimit())
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printk(KERN_ERR "ppp: compressor dropped pkt\n");
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kfree_skb(skb);
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kfree_skb(new_skb);
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new_skb = NULL;
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}
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return new_skb;
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}
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/*
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* Compress and send a frame.
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* The caller should have locked the xmit path,
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@ -1113,29 +1164,14 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
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/* try to do packet compression */
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if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state != 0
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&& proto != PPP_LCP && proto != PPP_CCP) {
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new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len,
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GFP_ATOMIC);
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if (new_skb == 0) {
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printk(KERN_ERR "PPP: no memory (comp pkt)\n");
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if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) {
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if (net_ratelimit())
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printk(KERN_ERR "ppp: compression required but down - pkt dropped.\n");
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goto drop;
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}
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if (ppp->dev->hard_header_len > PPP_HDRLEN)
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skb_reserve(new_skb,
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ppp->dev->hard_header_len - PPP_HDRLEN);
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/* compressor still expects A/C bytes in hdr */
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len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
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new_skb->data, skb->len + 2,
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ppp->dev->mtu + PPP_HDRLEN);
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if (len > 0 && (ppp->flags & SC_CCP_UP)) {
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kfree_skb(skb);
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skb = new_skb;
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skb_put(skb, len);
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skb_pull(skb, 2); /* pull off A/C bytes */
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} else {
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/* didn't compress, or CCP not up yet */
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kfree_skb(new_skb);
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}
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skb = pad_compress_skb(ppp, skb);
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if (!skb)
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goto drop;
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}
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/*
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@ -1155,7 +1191,8 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
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return;
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drop:
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kfree_skb(skb);
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if (skb)
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kfree_skb(skb);
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++ppp->stats.tx_errors;
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}
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@ -1552,6 +1589,9 @@ ppp_receive_nonmp_frame(struct ppp *ppp, struct sk_buff *skb)
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&& (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0)
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skb = ppp_decompress_frame(ppp, skb);
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if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR)
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goto err;
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proto = PPP_PROTO(skb);
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switch (proto) {
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case PPP_VJC_COMP:
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@ -0,0 +1,724 @@
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/*
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* ppp_mppe.c - interface MPPE to the PPP code.
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* This version is for use with Linux kernel 2.6.14+
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*
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* By Frank Cusack <fcusack@fcusack.com>.
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* Copyright (c) 2002,2003,2004 Google, Inc.
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* All rights reserved.
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*
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* License:
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, provided that the above copyright
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* notice appears in all copies. This software is provided without any
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* warranty, express or implied.
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*
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* ALTERNATIVELY, provided that this notice is retained in full, this product
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* may be distributed under the terms of the GNU General Public License (GPL),
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* in which case the provisions of the GPL apply INSTEAD OF those given above.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* Changelog:
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* 08/12/05 - Matt Domsch <Matt_Domsch@dell.com>
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* Only need extra skb padding on transmit, not receive.
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* 06/18/04 - Matt Domsch <Matt_Domsch@dell.com>, Oleg Makarenko <mole@quadra.ru>
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* Use Linux kernel 2.6 arc4 and sha1 routines rather than
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* providing our own.
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* 2/15/04 - TS: added #include <version.h> and testing for Kernel
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* version before using
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* MOD_DEC_USAGE_COUNT/MOD_INC_USAGE_COUNT which are
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* deprecated in 2.6
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/version.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/crypto.h>
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#include <linux/mm.h>
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#include <linux/ppp_defs.h>
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#include <linux/ppp-comp.h>
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#include <asm/scatterlist.h>
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#include "ppp_mppe.h"
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MODULE_AUTHOR("Frank Cusack <fcusack@fcusack.com>");
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MODULE_DESCRIPTION("Point-to-Point Protocol Microsoft Point-to-Point Encryption support");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_ALIAS("ppp-compress-" __stringify(CI_MPPE));
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MODULE_VERSION("1.0.2");
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static void
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setup_sg(struct scatterlist *sg, const void *address, unsigned int length)
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{
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sg[0].page = virt_to_page(address);
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sg[0].offset = offset_in_page(address);
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sg[0].length = length;
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}
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#define SHA1_PAD_SIZE 40
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/*
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* kernel crypto API needs its arguments to be in kmalloc'd memory, not in the module
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* static data area. That means sha_pad needs to be kmalloc'd.
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*/
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struct sha_pad {
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unsigned char sha_pad1[SHA1_PAD_SIZE];
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unsigned char sha_pad2[SHA1_PAD_SIZE];
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};
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static struct sha_pad *sha_pad;
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static inline void sha_pad_init(struct sha_pad *shapad)
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{
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memset(shapad->sha_pad1, 0x00, sizeof(shapad->sha_pad1));
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memset(shapad->sha_pad2, 0xF2, sizeof(shapad->sha_pad2));
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}
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/*
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* State for an MPPE (de)compressor.
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*/
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struct ppp_mppe_state {
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struct crypto_tfm *arc4;
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struct crypto_tfm *sha1;
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unsigned char *sha1_digest;
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unsigned char master_key[MPPE_MAX_KEY_LEN];
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unsigned char session_key[MPPE_MAX_KEY_LEN];
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unsigned keylen; /* key length in bytes */
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/* NB: 128-bit == 16, 40-bit == 8! */
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/* If we want to support 56-bit, */
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/* the unit has to change to bits */
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unsigned char bits; /* MPPE control bits */
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unsigned ccount; /* 12-bit coherency count (seqno) */
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unsigned stateful; /* stateful mode flag */
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int discard; /* stateful mode packet loss flag */
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int sanity_errors; /* take down LCP if too many */
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int unit;
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int debug;
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struct compstat stats;
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};
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/* struct ppp_mppe_state.bits definitions */
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#define MPPE_BIT_A 0x80 /* Encryption table were (re)inititalized */
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#define MPPE_BIT_B 0x40 /* MPPC only (not implemented) */
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#define MPPE_BIT_C 0x20 /* MPPC only (not implemented) */
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#define MPPE_BIT_D 0x10 /* This is an encrypted frame */
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#define MPPE_BIT_FLUSHED MPPE_BIT_A
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#define MPPE_BIT_ENCRYPTED MPPE_BIT_D
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#define MPPE_BITS(p) ((p)[4] & 0xf0)
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#define MPPE_CCOUNT(p) ((((p)[4] & 0x0f) << 8) + (p)[5])
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#define MPPE_CCOUNT_SPACE 0x1000 /* The size of the ccount space */
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#define MPPE_OVHD 2 /* MPPE overhead/packet */
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#define SANITY_MAX 1600 /* Max bogon factor we will tolerate */
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/*
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* Key Derivation, from RFC 3078, RFC 3079.
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* Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
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*/
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static void get_new_key_from_sha(struct ppp_mppe_state * state, unsigned char *InterimKey)
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{
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struct scatterlist sg[4];
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setup_sg(&sg[0], state->master_key, state->keylen);
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setup_sg(&sg[1], sha_pad->sha_pad1, sizeof(sha_pad->sha_pad1));
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setup_sg(&sg[2], state->session_key, state->keylen);
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setup_sg(&sg[3], sha_pad->sha_pad2, sizeof(sha_pad->sha_pad2));
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crypto_digest_digest (state->sha1, sg, 4, state->sha1_digest);
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memcpy(InterimKey, state->sha1_digest, state->keylen);
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}
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/*
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* Perform the MPPE rekey algorithm, from RFC 3078, sec. 7.3.
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* Well, not what's written there, but rather what they meant.
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*/
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static void mppe_rekey(struct ppp_mppe_state * state, int initial_key)
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{
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unsigned char InterimKey[MPPE_MAX_KEY_LEN];
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struct scatterlist sg_in[1], sg_out[1];
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get_new_key_from_sha(state, InterimKey);
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if (!initial_key) {
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crypto_cipher_setkey(state->arc4, InterimKey, state->keylen);
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setup_sg(sg_in, InterimKey, state->keylen);
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setup_sg(sg_out, state->session_key, state->keylen);
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if (crypto_cipher_encrypt(state->arc4, sg_out, sg_in,
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state->keylen) != 0) {
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printk(KERN_WARNING "mppe_rekey: cipher_encrypt failed\n");
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}
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} else {
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memcpy(state->session_key, InterimKey, state->keylen);
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}
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if (state->keylen == 8) {
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/* See RFC 3078 */
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state->session_key[0] = 0xd1;
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state->session_key[1] = 0x26;
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state->session_key[2] = 0x9e;
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}
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crypto_cipher_setkey(state->arc4, state->session_key, state->keylen);
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}
|
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|
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/*
|
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* Allocate space for a (de)compressor.
|
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*/
|
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static void *mppe_alloc(unsigned char *options, int optlen)
|
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{
|
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struct ppp_mppe_state *state;
|
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unsigned int digestsize;
|
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|
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if (optlen != CILEN_MPPE + sizeof(state->master_key)
|
||||
|| options[0] != CI_MPPE || options[1] != CILEN_MPPE)
|
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goto out;
|
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|
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state = (struct ppp_mppe_state *) kmalloc(sizeof(*state), GFP_KERNEL);
|
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if (state == NULL)
|
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goto out;
|
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|
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memset(state, 0, sizeof(*state));
|
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|
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state->arc4 = crypto_alloc_tfm("arc4", 0);
|
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if (!state->arc4)
|
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goto out_free;
|
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|
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state->sha1 = crypto_alloc_tfm("sha1", 0);
|
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if (!state->sha1)
|
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goto out_free;
|
||||
|
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digestsize = crypto_tfm_alg_digestsize(state->sha1);
|
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if (digestsize < MPPE_MAX_KEY_LEN)
|
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goto out_free;
|
||||
|
||||
state->sha1_digest = kmalloc(digestsize, GFP_KERNEL);
|
||||
if (!state->sha1_digest)
|
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goto out_free;
|
||||
|
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/* Save keys. */
|
||||
memcpy(state->master_key, &options[CILEN_MPPE],
|
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sizeof(state->master_key));
|
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memcpy(state->session_key, state->master_key,
|
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sizeof(state->master_key));
|
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|
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/*
|
||||
* We defer initial key generation until mppe_init(), as mppe_alloc()
|
||||
* is called frequently during negotiation.
|
||||
*/
|
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return (void *)state;
|
||||
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||||
out_free:
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if (state->sha1_digest)
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kfree(state->sha1_digest);
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if (state->sha1)
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crypto_free_tfm(state->sha1);
|
||||
if (state->arc4)
|
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crypto_free_tfm(state->arc4);
|
||||
kfree(state);
|
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out:
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||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Deallocate space for a (de)compressor.
|
||||
*/
|
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static void mppe_free(void *arg)
|
||||
{
|
||||
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
||||
if (state) {
|
||||
if (state->sha1_digest)
|
||||
kfree(state->sha1_digest);
|
||||
if (state->sha1)
|
||||
crypto_free_tfm(state->sha1);
|
||||
if (state->arc4)
|
||||
crypto_free_tfm(state->arc4);
|
||||
kfree(state);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialize (de)compressor state.
|
||||
*/
|
||||
static int
|
||||
mppe_init(void *arg, unsigned char *options, int optlen, int unit, int debug,
|
||||
const char *debugstr)
|
||||
{
|
||||
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
||||
unsigned char mppe_opts;
|
||||
|
||||
if (optlen != CILEN_MPPE
|
||||
|| options[0] != CI_MPPE || options[1] != CILEN_MPPE)
|
||||
return 0;
|
||||
|
||||
MPPE_CI_TO_OPTS(&options[2], mppe_opts);
|
||||
if (mppe_opts & MPPE_OPT_128)
|
||||
state->keylen = 16;
|
||||
else if (mppe_opts & MPPE_OPT_40)
|
||||
state->keylen = 8;
|
||||
else {
|
||||
printk(KERN_WARNING "%s[%d]: unknown key length\n", debugstr,
|
||||
unit);
|
||||
return 0;
|
||||
}
|
||||
if (mppe_opts & MPPE_OPT_STATEFUL)
|
||||
state->stateful = 1;
|
||||
|
||||
/* Generate the initial session key. */
|
||||
mppe_rekey(state, 1);
|
||||
|
||||
if (debug) {
|
||||
int i;
|
||||
char mkey[sizeof(state->master_key) * 2 + 1];
|
||||
char skey[sizeof(state->session_key) * 2 + 1];
|
||||
|
||||
printk(KERN_DEBUG "%s[%d]: initialized with %d-bit %s mode\n",
|
||||
debugstr, unit, (state->keylen == 16) ? 128 : 40,
|
||||
(state->stateful) ? "stateful" : "stateless");
|
||||
|
||||
for (i = 0; i < sizeof(state->master_key); i++)
|
||||
sprintf(mkey + i * 2, "%02x", state->master_key[i]);
|
||||
for (i = 0; i < sizeof(state->session_key); i++)
|
||||
sprintf(skey + i * 2, "%02x", state->session_key[i]);
|
||||
printk(KERN_DEBUG
|
||||
"%s[%d]: keys: master: %s initial session: %s\n",
|
||||
debugstr, unit, mkey, skey);
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialize the coherency count. The initial value is not specified
|
||||
* in RFC 3078, but we can make a reasonable assumption that it will
|
||||
* start at 0. Setting it to the max here makes the comp/decomp code
|
||||
* do the right thing (determined through experiment).
|
||||
*/
|
||||
state->ccount = MPPE_CCOUNT_SPACE - 1;
|
||||
|
||||
/*
|
||||
* Note that even though we have initialized the key table, we don't
|
||||
* set the FLUSHED bit. This is contrary to RFC 3078, sec. 3.1.
|
||||
*/
|
||||
state->bits = MPPE_BIT_ENCRYPTED;
|
||||
|
||||
state->unit = unit;
|
||||
state->debug = debug;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int
|
||||
mppe_comp_init(void *arg, unsigned char *options, int optlen, int unit,
|
||||
int hdrlen, int debug)
|
||||
{
|
||||
/* ARGSUSED */
|
||||
return mppe_init(arg, options, optlen, unit, debug, "mppe_comp_init");
|
||||
}
|
||||
|
||||
/*
|
||||
* We received a CCP Reset-Request (actually, we are sending a Reset-Ack),
|
||||
* tell the compressor to rekey. Note that we MUST NOT rekey for
|
||||
* every CCP Reset-Request; we only rekey on the next xmit packet.
|
||||
* We might get multiple CCP Reset-Requests if our CCP Reset-Ack is lost.
|
||||
* So, rekeying for every CCP Reset-Request is broken as the peer will not
|
||||
* know how many times we've rekeyed. (If we rekey and THEN get another
|
||||
* CCP Reset-Request, we must rekey again.)
|
||||
*/
|
||||
static void mppe_comp_reset(void *arg)
|
||||
{
|
||||
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
||||
|
||||
state->bits |= MPPE_BIT_FLUSHED;
|
||||
}
|
||||
|
||||
/*
|
||||
* Compress (encrypt) a packet.
|
||||
* It's strange to call this a compressor, since the output is always
|
||||
* MPPE_OVHD + 2 bytes larger than the input.
|
||||
*/
|
||||
static int
|
||||
mppe_compress(void *arg, unsigned char *ibuf, unsigned char *obuf,
|
||||
int isize, int osize)
|
||||
{
|
||||
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
||||
int proto;
|
||||
struct scatterlist sg_in[1], sg_out[1];
|
||||
|
||||
/*
|
||||
* Check that the protocol is in the range we handle.
|
||||
*/
|
||||
proto = PPP_PROTOCOL(ibuf);
|
||||
if (proto < 0x0021 || proto > 0x00fa)
|
||||
return 0;
|
||||
|
||||
/* Make sure we have enough room to generate an encrypted packet. */
|
||||
if (osize < isize + MPPE_OVHD + 2) {
|
||||
/* Drop the packet if we should encrypt it, but can't. */
|
||||
printk(KERN_DEBUG "mppe_compress[%d]: osize too small! "
|
||||
"(have: %d need: %d)\n", state->unit,
|
||||
osize, osize + MPPE_OVHD + 2);
|
||||
return -1;
|
||||
}
|
||||
|
||||
osize = isize + MPPE_OVHD + 2;
|
||||
|
||||
/*
|
||||
* Copy over the PPP header and set control bits.
|
||||
*/
|
||||
obuf[0] = PPP_ADDRESS(ibuf);
|
||||
obuf[1] = PPP_CONTROL(ibuf);
|
||||
obuf[2] = PPP_COMP >> 8; /* isize + MPPE_OVHD + 1 */
|
||||
obuf[3] = PPP_COMP; /* isize + MPPE_OVHD + 2 */
|
||||
obuf += PPP_HDRLEN;
|
||||
|
||||
state->ccount = (state->ccount + 1) % MPPE_CCOUNT_SPACE;
|
||||
if (state->debug >= 7)
|
||||
printk(KERN_DEBUG "mppe_compress[%d]: ccount %d\n", state->unit,
|
||||
state->ccount);
|
||||
obuf[0] = state->ccount >> 8;
|
||||
obuf[1] = state->ccount & 0xff;
|
||||
|
||||
if (!state->stateful || /* stateless mode */
|
||||
((state->ccount & 0xff) == 0xff) || /* "flag" packet */
|
||||
(state->bits & MPPE_BIT_FLUSHED)) { /* CCP Reset-Request */
|
||||
/* We must rekey */
|
||||
if (state->debug && state->stateful)
|
||||
printk(KERN_DEBUG "mppe_compress[%d]: rekeying\n",
|
||||
state->unit);
|
||||
mppe_rekey(state, 0);
|
||||
state->bits |= MPPE_BIT_FLUSHED;
|
||||
}
|
||||
obuf[0] |= state->bits;
|
||||
state->bits &= ~MPPE_BIT_FLUSHED; /* reset for next xmit */
|
||||
|
||||
obuf += MPPE_OVHD;
|
||||
ibuf += 2; /* skip to proto field */
|
||||
isize -= 2;
|
||||
|
||||
/* Encrypt packet */
|
||||
setup_sg(sg_in, ibuf, isize);
|
||||
setup_sg(sg_out, obuf, osize);
|
||||
if (crypto_cipher_encrypt(state->arc4, sg_out, sg_in, isize) != 0) {
|
||||
printk(KERN_DEBUG "crypto_cypher_encrypt failed\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
state->stats.unc_bytes += isize;
|
||||
state->stats.unc_packets++;
|
||||
state->stats.comp_bytes += osize;
|
||||
state->stats.comp_packets++;
|
||||
|
||||
return osize;
|
||||
}
|
||||
|
||||
/*
|
||||
* Since every frame grows by MPPE_OVHD + 2 bytes, this is always going
|
||||
* to look bad ... and the longer the link is up the worse it will get.
|
||||
*/
|
||||
static void mppe_comp_stats(void *arg, struct compstat *stats)
|
||||
{
|
||||
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
||||
|
||||
*stats = state->stats;
|
||||
}
|
||||
|
||||
static int
|
||||
mppe_decomp_init(void *arg, unsigned char *options, int optlen, int unit,
|
||||
int hdrlen, int mru, int debug)
|
||||
{
|
||||
/* ARGSUSED */
|
||||
return mppe_init(arg, options, optlen, unit, debug, "mppe_decomp_init");
|
||||
}
|
||||
|
||||
/*
|
||||
* We received a CCP Reset-Ack. Just ignore it.
|
||||
*/
|
||||
static void mppe_decomp_reset(void *arg)
|
||||
{
|
||||
/* ARGSUSED */
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Decompress (decrypt) an MPPE packet.
|
||||
*/
|
||||
static int
|
||||
mppe_decompress(void *arg, unsigned char *ibuf, int isize, unsigned char *obuf,
|
||||
int osize)
|
||||
{
|
||||
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
||||
unsigned ccount;
|
||||
int flushed = MPPE_BITS(ibuf) & MPPE_BIT_FLUSHED;
|
||||
int sanity = 0;
|
||||
struct scatterlist sg_in[1], sg_out[1];
|
||||
|
||||
if (isize <= PPP_HDRLEN + MPPE_OVHD) {
|
||||
if (state->debug)
|
||||
printk(KERN_DEBUG
|
||||
"mppe_decompress[%d]: short pkt (%d)\n",
|
||||
state->unit, isize);
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
|
||||
/*
|
||||
* Make sure we have enough room to decrypt the packet.
|
||||
* Note that for our test we only subtract 1 byte whereas in
|
||||
* mppe_compress() we added 2 bytes (+MPPE_OVHD);
|
||||
* this is to account for possible PFC.
|
||||
*/
|
||||
if (osize < isize - MPPE_OVHD - 1) {
|
||||
printk(KERN_DEBUG "mppe_decompress[%d]: osize too small! "
|
||||
"(have: %d need: %d)\n", state->unit,
|
||||
osize, isize - MPPE_OVHD - 1);
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
osize = isize - MPPE_OVHD - 2; /* assume no PFC */
|
||||
|
||||
ccount = MPPE_CCOUNT(ibuf);
|
||||
if (state->debug >= 7)
|
||||
printk(KERN_DEBUG "mppe_decompress[%d]: ccount %d\n",
|
||||
state->unit, ccount);
|
||||
|
||||
/* sanity checks -- terminate with extreme prejudice */
|
||||
if (!(MPPE_BITS(ibuf) & MPPE_BIT_ENCRYPTED)) {
|
||||
printk(KERN_DEBUG
|
||||
"mppe_decompress[%d]: ENCRYPTED bit not set!\n",
|
||||
state->unit);
|
||||
state->sanity_errors += 100;
|
||||
sanity = 1;
|
||||
}
|
||||
if (!state->stateful && !flushed) {
|
||||
printk(KERN_DEBUG "mppe_decompress[%d]: FLUSHED bit not set in "
|
||||
"stateless mode!\n", state->unit);
|
||||
state->sanity_errors += 100;
|
||||
sanity = 1;
|
||||
}
|
||||
if (state->stateful && ((ccount & 0xff) == 0xff) && !flushed) {
|
||||
printk(KERN_DEBUG "mppe_decompress[%d]: FLUSHED bit not set on "
|
||||
"flag packet!\n", state->unit);
|
||||
state->sanity_errors += 100;
|
||||
sanity = 1;
|
||||
}
|
||||
|
||||
if (sanity) {
|
||||
if (state->sanity_errors < SANITY_MAX)
|
||||
return DECOMP_ERROR;
|
||||
else
|
||||
/*
|
||||
* Take LCP down if the peer is sending too many bogons.
|
||||
* We don't want to do this for a single or just a few
|
||||
* instances since it could just be due to packet corruption.
|
||||
*/
|
||||
return DECOMP_FATALERROR;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the coherency count.
|
||||
*/
|
||||
|
||||
if (!state->stateful) {
|
||||
/* RFC 3078, sec 8.1. Rekey for every packet. */
|
||||
while (state->ccount != ccount) {
|
||||
mppe_rekey(state, 0);
|
||||
state->ccount = (state->ccount + 1) % MPPE_CCOUNT_SPACE;
|
||||
}
|
||||
} else {
|
||||
/* RFC 3078, sec 8.2. */
|
||||
if (!state->discard) {
|
||||
/* normal state */
|
||||
state->ccount = (state->ccount + 1) % MPPE_CCOUNT_SPACE;
|
||||
if (ccount != state->ccount) {
|
||||
/*
|
||||
* (ccount > state->ccount)
|
||||
* Packet loss detected, enter the discard state.
|
||||
* Signal the peer to rekey (by sending a CCP Reset-Request).
|
||||
*/
|
||||
state->discard = 1;
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
} else {
|
||||
/* discard state */
|
||||
if (!flushed) {
|
||||
/* ccp.c will be silent (no additional CCP Reset-Requests). */
|
||||
return DECOMP_ERROR;
|
||||
} else {
|
||||
/* Rekey for every missed "flag" packet. */
|
||||
while ((ccount & ~0xff) !=
|
||||
(state->ccount & ~0xff)) {
|
||||
mppe_rekey(state, 0);
|
||||
state->ccount =
|
||||
(state->ccount +
|
||||
256) % MPPE_CCOUNT_SPACE;
|
||||
}
|
||||
|
||||
/* reset */
|
||||
state->discard = 0;
|
||||
state->ccount = ccount;
|
||||
/*
|
||||
* Another problem with RFC 3078 here. It implies that the
|
||||
* peer need not send a Reset-Ack packet. But RFC 1962
|
||||
* requires it. Hopefully, M$ does send a Reset-Ack; even
|
||||
* though it isn't required for MPPE synchronization, it is
|
||||
* required to reset CCP state.
|
||||
*/
|
||||
}
|
||||
}
|
||||
if (flushed)
|
||||
mppe_rekey(state, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Fill in the first part of the PPP header. The protocol field
|
||||
* comes from the decrypted data.
|
||||
*/
|
||||
obuf[0] = PPP_ADDRESS(ibuf); /* +1 */
|
||||
obuf[1] = PPP_CONTROL(ibuf); /* +1 */
|
||||
obuf += 2;
|
||||
ibuf += PPP_HDRLEN + MPPE_OVHD;
|
||||
isize -= PPP_HDRLEN + MPPE_OVHD; /* -6 */
|
||||
/* net osize: isize-4 */
|
||||
|
||||
/*
|
||||
* Decrypt the first byte in order to check if it is
|
||||
* a compressed or uncompressed protocol field.
|
||||
*/
|
||||
setup_sg(sg_in, ibuf, 1);
|
||||
setup_sg(sg_out, obuf, 1);
|
||||
if (crypto_cipher_decrypt(state->arc4, sg_out, sg_in, 1) != 0) {
|
||||
printk(KERN_DEBUG "crypto_cypher_decrypt failed\n");
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
|
||||
/*
|
||||
* Do PFC decompression.
|
||||
* This would be nicer if we were given the actual sk_buff
|
||||
* instead of a char *.
|
||||
*/
|
||||
if ((obuf[0] & 0x01) != 0) {
|
||||
obuf[1] = obuf[0];
|
||||
obuf[0] = 0;
|
||||
obuf++;
|
||||
osize++;
|
||||
}
|
||||
|
||||
/* And finally, decrypt the rest of the packet. */
|
||||
setup_sg(sg_in, ibuf + 1, isize - 1);
|
||||
setup_sg(sg_out, obuf + 1, osize - 1);
|
||||
if (crypto_cipher_decrypt(state->arc4, sg_out, sg_in, isize - 1) != 0) {
|
||||
printk(KERN_DEBUG "crypto_cypher_decrypt failed\n");
|
||||
return DECOMP_ERROR;
|
||||
}
|
||||
|
||||
state->stats.unc_bytes += osize;
|
||||
state->stats.unc_packets++;
|
||||
state->stats.comp_bytes += isize;
|
||||
state->stats.comp_packets++;
|
||||
|
||||
/* good packet credit */
|
||||
state->sanity_errors >>= 1;
|
||||
|
||||
return osize;
|
||||
}
|
||||
|
||||
/*
|
||||
* Incompressible data has arrived (this should never happen!).
|
||||
* We should probably drop the link if the protocol is in the range
|
||||
* of what should be encrypted. At the least, we should drop this
|
||||
* packet. (How to do this?)
|
||||
*/
|
||||
static void mppe_incomp(void *arg, unsigned char *ibuf, int icnt)
|
||||
{
|
||||
struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
||||
|
||||
if (state->debug &&
|
||||
(PPP_PROTOCOL(ibuf) >= 0x0021 && PPP_PROTOCOL(ibuf) <= 0x00fa))
|
||||
printk(KERN_DEBUG
|
||||
"mppe_incomp[%d]: incompressible (unencrypted) data! "
|
||||
"(proto %04x)\n", state->unit, PPP_PROTOCOL(ibuf));
|
||||
|
||||
state->stats.inc_bytes += icnt;
|
||||
state->stats.inc_packets++;
|
||||
state->stats.unc_bytes += icnt;
|
||||
state->stats.unc_packets++;
|
||||
}
|
||||
|
||||
/*************************************************************
|
||||
* Module interface table
|
||||
*************************************************************/
|
||||
|
||||
/*
|
||||
* Procedures exported to if_ppp.c.
|
||||
*/
|
||||
static struct compressor ppp_mppe = {
|
||||
.compress_proto = CI_MPPE,
|
||||
.comp_alloc = mppe_alloc,
|
||||
.comp_free = mppe_free,
|
||||
.comp_init = mppe_comp_init,
|
||||
.comp_reset = mppe_comp_reset,
|
||||
.compress = mppe_compress,
|
||||
.comp_stat = mppe_comp_stats,
|
||||
.decomp_alloc = mppe_alloc,
|
||||
.decomp_free = mppe_free,
|
||||
.decomp_init = mppe_decomp_init,
|
||||
.decomp_reset = mppe_decomp_reset,
|
||||
.decompress = mppe_decompress,
|
||||
.incomp = mppe_incomp,
|
||||
.decomp_stat = mppe_comp_stats,
|
||||
.owner = THIS_MODULE,
|
||||
.comp_extra = MPPE_PAD,
|
||||
};
|
||||
|
||||
/*
|
||||
* ppp_mppe_init()
|
||||
*
|
||||
* Prior to allowing load, try to load the arc4 and sha1 crypto
|
||||
* libraries. The actual use will be allocated later, but
|
||||
* this way the module will fail to insmod if they aren't available.
|
||||
*/
|
||||
|
||||
static int __init ppp_mppe_init(void)
|
||||
{
|
||||
int answer;
|
||||
if (!(crypto_alg_available("arc4", 0) &&
|
||||
crypto_alg_available("sha1", 0)))
|
||||
return -ENODEV;
|
||||
|
||||
sha_pad = kmalloc(sizeof(struct sha_pad), GFP_KERNEL);
|
||||
if (!sha_pad)
|
||||
return -ENOMEM;
|
||||
sha_pad_init(sha_pad);
|
||||
|
||||
answer = ppp_register_compressor(&ppp_mppe);
|
||||
|
||||
if (answer == 0)
|
||||
printk(KERN_INFO "PPP MPPE Compression module registered\n");
|
||||
else
|
||||
kfree(sha_pad);
|
||||
|
||||
return answer;
|
||||
}
|
||||
|
||||
static void __exit ppp_mppe_cleanup(void)
|
||||
{
|
||||
ppp_unregister_compressor(&ppp_mppe);
|
||||
kfree(sha_pad);
|
||||
}
|
||||
|
||||
module_init(ppp_mppe_init);
|
||||
module_exit(ppp_mppe_cleanup);
|
||||
|
|
@ -0,0 +1,86 @@
|
|||
#define MPPE_PAD 4 /* MPPE growth per frame */
|
||||
#define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */
|
||||
|
||||
/* option bits for ccp_options.mppe */
|
||||
#define MPPE_OPT_40 0x01 /* 40 bit */
|
||||
#define MPPE_OPT_128 0x02 /* 128 bit */
|
||||
#define MPPE_OPT_STATEFUL 0x04 /* stateful mode */
|
||||
/* unsupported opts */
|
||||
#define MPPE_OPT_56 0x08 /* 56 bit */
|
||||
#define MPPE_OPT_MPPC 0x10 /* MPPC compression */
|
||||
#define MPPE_OPT_D 0x20 /* Unknown */
|
||||
#define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D)
|
||||
#define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */
|
||||
|
||||
/*
|
||||
* This is not nice ... the alternative is a bitfield struct though.
|
||||
* And unfortunately, we cannot share the same bits for the option
|
||||
* names above since C and H are the same bit. We could do a u_int32
|
||||
* but then we have to do a htonl() all the time and/or we still need
|
||||
* to know which octet is which.
|
||||
*/
|
||||
#define MPPE_C_BIT 0x01 /* MPPC */
|
||||
#define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */
|
||||
#define MPPE_L_BIT 0x20 /* 40-bit */
|
||||
#define MPPE_S_BIT 0x40 /* 128-bit */
|
||||
#define MPPE_M_BIT 0x80 /* 56-bit, not supported */
|
||||
#define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */
|
||||
|
||||
/* Does not include H bit; used for least significant octet only. */
|
||||
#define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT)
|
||||
|
||||
/* Build a CI from mppe opts (see RFC 3078) */
|
||||
#define MPPE_OPTS_TO_CI(opts, ci) \
|
||||
do { \
|
||||
u_char *ptr = ci; /* u_char[4] */ \
|
||||
\
|
||||
/* H bit */ \
|
||||
if (opts & MPPE_OPT_STATEFUL) \
|
||||
*ptr++ = 0x0; \
|
||||
else \
|
||||
*ptr++ = MPPE_H_BIT; \
|
||||
*ptr++ = 0; \
|
||||
*ptr++ = 0; \
|
||||
\
|
||||
/* S,L bits */ \
|
||||
*ptr = 0; \
|
||||
if (opts & MPPE_OPT_128) \
|
||||
*ptr |= MPPE_S_BIT; \
|
||||
if (opts & MPPE_OPT_40) \
|
||||
*ptr |= MPPE_L_BIT; \
|
||||
/* M,D,C bits not supported */ \
|
||||
} while (/* CONSTCOND */ 0)
|
||||
|
||||
/* The reverse of the above */
|
||||
#define MPPE_CI_TO_OPTS(ci, opts) \
|
||||
do { \
|
||||
u_char *ptr = ci; /* u_char[4] */ \
|
||||
\
|
||||
opts = 0; \
|
||||
\
|
||||
/* H bit */ \
|
||||
if (!(ptr[0] & MPPE_H_BIT)) \
|
||||
opts |= MPPE_OPT_STATEFUL; \
|
||||
\
|
||||
/* S,L bits */ \
|
||||
if (ptr[3] & MPPE_S_BIT) \
|
||||
opts |= MPPE_OPT_128; \
|
||||
if (ptr[3] & MPPE_L_BIT) \
|
||||
opts |= MPPE_OPT_40; \
|
||||
\
|
||||
/* M,D,C bits */ \
|
||||
if (ptr[3] & MPPE_M_BIT) \
|
||||
opts |= MPPE_OPT_56; \
|
||||
if (ptr[3] & MPPE_D_BIT) \
|
||||
opts |= MPPE_OPT_D; \
|
||||
if (ptr[3] & MPPE_C_BIT) \
|
||||
opts |= MPPE_OPT_MPPC; \
|
||||
\
|
||||
/* Other bits */ \
|
||||
if (ptr[0] & ~MPPE_H_BIT) \
|
||||
opts |= MPPE_OPT_UNKNOWN; \
|
||||
if (ptr[1] || ptr[2]) \
|
||||
opts |= MPPE_OPT_UNKNOWN; \
|
||||
if (ptr[3] & ~MPPE_ALL_BITS) \
|
||||
opts |= MPPE_OPT_UNKNOWN; \
|
||||
} while (/* CONSTCOND */ 0)
|
||||
|
|
@ -21,7 +21,7 @@
|
|||
*/
|
||||
|
||||
/*
|
||||
* ==FILEVERSION 20000724==
|
||||
* ==FILEVERSION 20050812==
|
||||
*
|
||||
* NOTE TO MAINTAINERS:
|
||||
* If you modify this file at all, please set the above date.
|
||||
|
|
@ -35,6 +35,8 @@
|
|||
#ifndef _IF_PPP_H_
|
||||
#define _IF_PPP_H_
|
||||
|
||||
#include <linux/compiler.h>
|
||||
|
||||
/*
|
||||
* Packet sizes
|
||||
*/
|
||||
|
|
@ -70,7 +72,8 @@
|
|||
#define SC_LOG_RAWIN 0x00080000 /* log all chars received */
|
||||
#define SC_LOG_FLUSH 0x00100000 /* log all chars flushed */
|
||||
#define SC_SYNC 0x00200000 /* synchronous serial mode */
|
||||
#define SC_MASK 0x0f200fff /* bits that user can change */
|
||||
#define SC_MUST_COMP 0x00400000 /* no uncompressed packets may be sent or received */
|
||||
#define SC_MASK 0x0f600fff /* bits that user can change */
|
||||
|
||||
/* state bits */
|
||||
#define SC_XMIT_BUSY 0x10000000 /* (used by isdn_ppp?) */
|
||||
|
|
|
|||
|
|
@ -111,6 +111,8 @@ struct compressor {
|
|||
|
||||
/* Used in locking compressor modules */
|
||||
struct module *owner;
|
||||
/* Extra skb space needed by the compressor algorithm */
|
||||
unsigned int comp_extra;
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
@ -190,6 +192,13 @@ struct compressor {
|
|||
#define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL)
|
||||
#define DEFLATE_CHK_SEQUENCE 0
|
||||
|
||||
/*
|
||||
* Definitions for MPPE.
|
||||
*/
|
||||
|
||||
#define CI_MPPE 18 /* config option for MPPE */
|
||||
#define CILEN_MPPE 6 /* length of config option */
|
||||
|
||||
/*
|
||||
* Definitions for other, as yet unsupported, compression methods.
|
||||
*/
|
||||
|
|
|
|||
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