1999-03-29 02:21:34 +00:00
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/* packet-ipsec.c
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1999-10-15 05:30:43 +00:00
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* Routines for IPsec/IPComp packet disassembly
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1999-03-29 02:21:34 +00:00
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*
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2001-04-23 03:37:31 +00:00
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* $Id: packet-ipsec.c,v 1.29 2001/04/23 03:37:31 guy Exp $
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1999-03-29 02:21:34 +00:00
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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2000-11-17 21:00:40 +00:00
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#include <string.h>
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1999-03-29 02:21:34 +00:00
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#include <glib.h>
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#include "packet.h"
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2000-02-15 21:06:58 +00:00
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#include "packet-ipsec.h"
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2000-04-16 22:46:25 +00:00
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#include "packet-ip.h"
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1999-03-29 02:21:34 +00:00
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#include "resolv.h"
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2001-04-17 06:29:14 +00:00
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#include "ipproto.h"
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2000-07-08 10:46:23 +00:00
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#include "prefs.h"
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/* Place AH payload in sub tree */
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gboolean g_ah_payload_in_subtree = FALSE;
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1999-03-29 02:21:34 +00:00
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1999-07-29 05:47:07 +00:00
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static int proto_ah = -1;
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1999-10-11 12:37:50 +00:00
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static int hf_ah_spi = -1;
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static int hf_ah_sequence = -1;
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1999-07-29 05:47:07 +00:00
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static int proto_esp = -1;
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1999-10-11 12:37:50 +00:00
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static int hf_esp_spi = -1;
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static int hf_esp_sequence = -1;
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1999-10-15 05:30:43 +00:00
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static int proto_ipcomp = -1;
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1999-10-15 05:46:18 +00:00
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static int hf_ipcomp_flags = -1;
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1999-10-15 05:30:43 +00:00
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static int hf_ipcomp_cpi = -1;
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1999-07-29 05:47:07 +00:00
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1999-11-16 11:44:20 +00:00
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static gint ett_ah = -1;
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static gint ett_esp = -1;
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static gint ett_ipcomp = -1;
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1999-03-29 02:21:34 +00:00
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struct newah {
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guint8 ah_nxt; /* Next Header */
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guint8 ah_len; /* Length of data + 1, in 32bit */
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guint16 ah_reserve; /* Reserved for future use */
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guint32 ah_spi; /* Security parameter index */
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guint32 ah_seq; /* Sequence number field */
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/* variable size, 32bit bound*/ /* Authentication data */
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};
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struct newesp {
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guint32 esp_spi; /* ESP */
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guint32 esp_seq; /* Sequence number */
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/*variable size*/ /* (IV and) Payload data */
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/*variable size*/ /* padding */
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/*8bit*/ /* pad size */
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/*8bit*/ /* next header */
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/*8bit*/ /* next header */
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/*variable size, 32bit bound*/ /* Authentication data */
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};
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1999-10-15 05:30:43 +00:00
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struct ipcomp {
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guint8 comp_nxt; /* Next Header */
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guint8 comp_flags; /* Must be zero */
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guint16 comp_cpi; /* Compression parameter index */
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};
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/* well-known algorithm number (in CPI), from RFC2409 */
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#define IPCOMP_OUI 1 /* vendor specific */
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#define IPCOMP_DEFLATE 2 /* RFC2394 */
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#define IPCOMP_LZS 3 /* RFC2395 */
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#define IPCOMP_MAX 4
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static const value_string cpi2val[] = {
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{ IPCOMP_OUI, "OUI" },
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{ IPCOMP_DEFLATE, "DEFLATE" },
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{ IPCOMP_LZS, "LZS" },
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{ 0, NULL },
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};
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1999-03-29 02:21:34 +00:00
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#ifndef offsetof
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#endif
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2001-02-28 06:37:29 +00:00
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static void
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dissect_ah(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *next_tree;
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guint8 nxt;
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tvbuff_t *next_tvb;
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int advance;
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1999-03-29 02:21:34 +00:00
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2001-02-28 06:37:29 +00:00
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advance = dissect_ah_header(tvb, pinfo, tree, &nxt, &next_tree);
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next_tvb = tvb_new_subset(tvb, advance, -1, -1);
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if (g_ah_payload_in_subtree) {
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col_set_writable(pinfo->fd, FALSE);
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1999-03-29 02:21:34 +00:00
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}
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2001-02-28 06:37:29 +00:00
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/* do lookup with the subdissector table */
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if (!dissector_try_port(ip_dissector_table, nxt, next_tvb, pinfo, next_tree)) {
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dissect_data(next_tvb, 0, pinfo, next_tree);
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}
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1999-03-29 02:21:34 +00:00
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}
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2001-04-23 03:37:31 +00:00
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int
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2001-02-28 06:37:29 +00:00
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dissect_ah_header(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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guint8 *nxt_p, proto_tree **next_tree_p)
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2000-06-05 03:21:03 +00:00
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{
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2001-02-28 06:37:29 +00:00
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proto_tree *ah_tree;
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2000-06-05 03:21:03 +00:00
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proto_item *ti;
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struct newah ah;
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int advance;
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2001-02-28 06:37:29 +00:00
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "AH");
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if (check_col(pinfo->fd, COL_INFO))
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col_clear(pinfo->fd, COL_INFO);
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Add the "Edit:Protocols..." feature which currently only implements
the following:
It is now possible to enable/disable a particular protocol decoding
(i.e. the protocol dissector is void or not). When a protocol
is disabled, it is displayed as Data and of course, all linked
sub-protocols are disabled as well.
Disabling a protocol could be interesting:
- in case of buggy dissectors
- in case of wrong heuristics
- for performance reasons
- to decode the data as another protocol (TODO)
Currently (if I am not wrong), all dissectors but NFS can be disabled
(and dissectors that do not register protocols :-)
I do not like the way the RPC sub-dissectors are disabled (in the
sub-dissectors) since this could be done in the RPC dissector itself,
knowing the sub-protocol hfinfo entry (this is why, I've not modified
the NFS one yet).
Two functions are added in proto.c :
gboolean proto_is_protocol_enabled(int n);
void proto_set_decoding(int n, gboolean enabled);
and two MACROs which can be used in dissectors:
OLD_CHECK_DISPLAY_AS_DATA(index, pd, offset, fd, tree)
CHECK_DISPLAY_AS_DATA(index, tvb, pinfo, tree)
See also the XXX in proto_dlg.c and proto.c around the new functions.
svn path=/trunk/; revision=2267
2000-08-13 14:09:15 +00:00
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2001-02-28 06:37:29 +00:00
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tvb_memcpy(tvb, (guint8 *)&ah, 0, sizeof(ah));
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2000-06-05 03:21:03 +00:00
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advance = sizeof(ah) + ((ah.ah_len - 1) << 2);
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2001-02-28 06:37:29 +00:00
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if (check_col(pinfo->fd, COL_INFO)) {
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col_add_fstr(pinfo->fd, COL_INFO, "AH (SPI=0x%08x)",
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2000-06-05 03:21:03 +00:00
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(guint32)ntohl(ah.ah_spi));
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}
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if (tree) {
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/* !!! specify length */
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2001-02-28 06:37:29 +00:00
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ti = proto_tree_add_item(tree, proto_ah, tvb, 0, advance, FALSE);
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2000-06-05 03:21:03 +00:00
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ah_tree = proto_item_add_subtree(ti, ett_ah);
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2001-02-28 06:37:29 +00:00
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proto_tree_add_text(ah_tree, tvb,
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offsetof(struct newah, ah_nxt), 1,
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"Next Header: %s (0x%02x)",
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ipprotostr(ah.ah_nxt), ah.ah_nxt);
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proto_tree_add_text(ah_tree, tvb,
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offsetof(struct newah, ah_len), 1,
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"Length: %u", ah.ah_len << 2);
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proto_tree_add_uint(ah_tree, hf_ah_spi, tvb,
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offsetof(struct newah, ah_spi), 4,
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2000-06-05 03:21:03 +00:00
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(guint32)ntohl(ah.ah_spi));
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2001-02-28 06:37:29 +00:00
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proto_tree_add_uint(ah_tree, hf_ah_sequence, tvb,
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offsetof(struct newah, ah_seq), 4,
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2000-06-05 03:21:03 +00:00
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(guint32)ntohl(ah.ah_seq));
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2001-02-28 06:37:29 +00:00
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proto_tree_add_text(ah_tree, tvb,
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sizeof(ah), (ah.ah_len - 1) << 2,
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2000-06-05 03:21:03 +00:00
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"ICV");
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2000-07-08 10:46:23 +00:00
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2001-02-28 06:37:29 +00:00
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if (next_tree_p != NULL) {
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/* Decide where to place next protocol decode */
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if (g_ah_payload_in_subtree) {
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*next_tree_p = ah_tree;
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}
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else {
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*next_tree_p = tree;
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}
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2000-07-08 10:46:23 +00:00
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}
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2001-02-28 06:37:29 +00:00
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} else {
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if (next_tree_p != NULL)
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*next_tree_p = NULL;
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2000-06-05 03:21:03 +00:00
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}
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2001-02-28 06:37:29 +00:00
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if (nxt_p != NULL)
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*nxt_p = ah.ah_nxt;
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2000-07-08 10:46:23 +00:00
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2001-02-28 06:37:29 +00:00
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/* start of the new header (could be a extension header) */
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return advance;
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2000-06-05 03:21:03 +00:00
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}
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2000-04-20 07:05:58 +00:00
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static void
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2001-02-28 06:37:29 +00:00
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dissect_esp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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1999-03-29 02:21:34 +00:00
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{
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1999-10-17 08:33:23 +00:00
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proto_tree *esp_tree;
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1999-03-29 02:21:34 +00:00
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proto_item *ti;
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struct newesp esp;
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/*
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* load the top pane info. This should be overwritten by
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* the next protocol in the stack
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*/
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2001-02-28 06:37:29 +00:00
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "ESP");
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if (check_col(pinfo->fd, COL_INFO))
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col_clear(pinfo->fd, COL_INFO);
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tvb_memcpy(tvb, (guint8 *)&esp, 0, sizeof(esp));
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if (check_col(pinfo->fd, COL_INFO)) {
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col_add_fstr(pinfo->fd, COL_INFO, "ESP (SPI=0x%08x)",
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1999-03-29 02:21:34 +00:00
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(guint32)ntohl(esp.esp_spi));
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}
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/*
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* populate a tree in the second pane with the status of the link layer
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* (ie none)
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*/
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if(tree) {
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2001-02-28 06:37:29 +00:00
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ti = proto_tree_add_item(tree, proto_esp, tvb, 0,
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tvb_length(tvb), FALSE);
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1999-11-16 11:44:20 +00:00
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esp_tree = proto_item_add_subtree(ti, ett_esp);
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2001-02-28 06:37:29 +00:00
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proto_tree_add_uint(esp_tree, hf_esp_spi, tvb,
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offsetof(struct newesp, esp_spi), 4,
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1999-10-17 08:33:23 +00:00
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(guint32)ntohl(esp.esp_spi));
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2001-02-28 06:37:29 +00:00
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proto_tree_add_uint(esp_tree, hf_esp_sequence, tvb,
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offsetof(struct newesp, esp_seq), 4,
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1999-10-17 08:33:23 +00:00
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(guint32)ntohl(esp.esp_seq));
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2001-02-28 06:37:29 +00:00
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dissect_data(tvb, sizeof(struct newesp), pinfo, esp_tree);
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1999-10-15 05:30:43 +00:00
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}
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}
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|
2000-04-20 07:05:58 +00:00
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static void
|
2001-02-28 06:37:29 +00:00
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dissect_ipcomp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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1999-10-15 05:30:43 +00:00
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{
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proto_tree *ipcomp_tree;
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proto_item *ti;
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struct ipcomp ipcomp;
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char *p;
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/*
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* load the top pane info. This should be overwritten by
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|
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* the next protocol in the stack
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*/
|
2001-02-28 06:37:29 +00:00
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "IPComp");
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if (check_col(pinfo->fd, COL_INFO))
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col_clear(pinfo->fd, COL_INFO);
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tvb_memcpy(tvb, (guint8 *)&ipcomp, 0, sizeof(ipcomp));
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if (check_col(pinfo->fd, COL_INFO)) {
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p = match_strval(ntohs(ipcomp.comp_cpi), cpi2val);
|
|
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|
if (p == NULL) {
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col_add_fstr(pinfo->fd, COL_INFO, "IPComp (CPI=0x%04x)",
|
1999-10-15 05:30:43 +00:00
|
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ntohs(ipcomp.comp_cpi));
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|
|
|
} else
|
2001-02-28 06:37:29 +00:00
|
|
|
col_add_fstr(pinfo->fd, COL_INFO, "IPComp (CPI=%s)", p);
|
1999-10-15 05:30:43 +00:00
|
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|
}
|
|
|
|
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|
|
|
/*
|
|
|
|
* populate a tree in the second pane with the status of the link layer
|
|
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|
* (ie none)
|
|
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|
*/
|
|
|
|
if (tree) {
|
2001-02-28 06:37:29 +00:00
|
|
|
ti = proto_tree_add_item(tree, proto_ipcomp, tvb, 0,
|
|
|
|
tvb_length(tvb), FALSE);
|
1999-11-16 11:44:20 +00:00
|
|
|
ipcomp_tree = proto_item_add_subtree(ti, ett_ipcomp);
|
1999-10-15 05:30:43 +00:00
|
|
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|
2001-02-28 06:37:29 +00:00
|
|
|
proto_tree_add_text(ipcomp_tree, tvb,
|
|
|
|
offsetof(struct ipcomp, comp_nxt), 1,
|
1999-10-15 05:30:43 +00:00
|
|
|
"Next Header: %s (0x%02x)",
|
|
|
|
ipprotostr(ipcomp.comp_nxt), ipcomp.comp_nxt);
|
2001-02-28 06:37:29 +00:00
|
|
|
proto_tree_add_uint(ipcomp_tree, hf_ipcomp_flags, tvb,
|
|
|
|
offsetof(struct ipcomp, comp_flags), 1,
|
1999-10-15 05:46:18 +00:00
|
|
|
ipcomp.comp_flags);
|
2001-02-28 06:37:29 +00:00
|
|
|
proto_tree_add_uint(ipcomp_tree, hf_ipcomp_cpi, tvb,
|
|
|
|
offsetof(struct ipcomp, comp_cpi), 2,
|
|
|
|
ntohs(ipcomp.comp_cpi));
|
|
|
|
dissect_data(tvb, sizeof(struct ipcomp), pinfo, ipcomp_tree);
|
1999-03-29 02:21:34 +00:00
|
|
|
}
|
|
|
|
}
|
1999-07-29 05:47:07 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_ipsec(void)
|
|
|
|
{
|
1999-10-11 12:37:50 +00:00
|
|
|
|
|
|
|
static hf_register_info hf_ah[] = {
|
|
|
|
{ &hf_ah_spi,
|
1999-10-12 06:21:15 +00:00
|
|
|
{ "SPI", "ah.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
|
|
"" }},
|
1999-10-11 12:37:50 +00:00
|
|
|
{ &hf_ah_sequence,
|
1999-10-12 06:21:15 +00:00
|
|
|
{ "Sequence", "ah.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
|
|
"" }}
|
1999-10-11 12:37:50 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static hf_register_info hf_esp[] = {
|
|
|
|
{ &hf_esp_spi,
|
1999-10-12 06:21:15 +00:00
|
|
|
{ "SPI", "esp.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
|
|
"" }},
|
1999-10-11 12:37:50 +00:00
|
|
|
{ &hf_esp_sequence,
|
1999-10-12 06:21:15 +00:00
|
|
|
{ "Sequence", "esp.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
|
|
"" }}
|
1999-10-11 12:37:50 +00:00
|
|
|
};
|
|
|
|
|
1999-10-15 05:30:43 +00:00
|
|
|
static hf_register_info hf_ipcomp[] = {
|
1999-10-15 05:46:18 +00:00
|
|
|
{ &hf_ipcomp_flags,
|
|
|
|
{ "Flags", "ipcomp.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
|
|
"" }},
|
1999-10-15 05:30:43 +00:00
|
|
|
{ &hf_ipcomp_cpi,
|
2001-02-28 06:37:29 +00:00
|
|
|
{ "CPI", "ipcomp.cpi", FT_UINT16, BASE_HEX,
|
|
|
|
VALS(cpi2val), 0x0, "" }},
|
1999-10-15 05:30:43 +00:00
|
|
|
};
|
1999-11-16 11:44:20 +00:00
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_ah,
|
|
|
|
&ett_esp,
|
|
|
|
&ett_ipcomp,
|
|
|
|
};
|
1999-10-15 05:30:43 +00:00
|
|
|
|
2000-07-08 10:46:23 +00:00
|
|
|
module_t *ah_module;
|
|
|
|
|
2001-01-03 06:56:03 +00:00
|
|
|
proto_ah = proto_register_protocol("Authentication Header", "AH", "ah");
|
1999-10-11 12:37:50 +00:00
|
|
|
proto_register_field_array(proto_ah, hf_ah, array_length(hf_ah));
|
1999-10-15 05:30:43 +00:00
|
|
|
|
2001-02-03 20:08:04 +00:00
|
|
|
proto_esp = proto_register_protocol("Encapsulating Security Payload",
|
2001-01-03 06:56:03 +00:00
|
|
|
"ESP", "esp");
|
1999-10-11 12:37:50 +00:00
|
|
|
proto_register_field_array(proto_esp, hf_esp, array_length(hf_esp));
|
|
|
|
|
2001-01-03 06:56:03 +00:00
|
|
|
proto_ipcomp = proto_register_protocol("IP Payload Compression",
|
|
|
|
"IPComp", "ipcomp");
|
1999-10-15 05:30:43 +00:00
|
|
|
proto_register_field_array(proto_ipcomp, hf_ipcomp, array_length(hf_ipcomp));
|
1999-11-16 11:44:20 +00:00
|
|
|
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
2000-07-08 10:46:23 +00:00
|
|
|
|
|
|
|
/* Register a configuration option for placement of AH payload dissection */
|
2001-01-03 07:53:48 +00:00
|
|
|
ah_module = prefs_register_protocol(proto_ah, NULL);
|
2000-07-08 10:46:23 +00:00
|
|
|
prefs_register_bool_preference(ah_module, "place_ah_payload_in_subtree",
|
|
|
|
"Place AH payload in subtree",
|
|
|
|
"Whether the AH payload decode should be placed in a subtree",
|
|
|
|
&g_ah_payload_in_subtree);
|
1999-07-29 05:47:07 +00:00
|
|
|
}
|
2000-04-16 22:46:25 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_ipsec(void)
|
|
|
|
{
|
2001-02-28 06:37:29 +00:00
|
|
|
dissector_add("ip.proto", IP_PROTO_AH, dissect_ah, proto_ah);
|
|
|
|
dissector_add("ip.proto", IP_PROTO_ESP, dissect_esp, proto_esp);
|
|
|
|
dissector_add("ip.proto", IP_PROTO_IPCOMP, dissect_ipcomp, proto_ipcomp);
|
2000-04-16 22:46:25 +00:00
|
|
|
}
|