forked from osmocom/wireshark
574 lines
19 KiB
C
574 lines
19 KiB
C
/* packet-bpkmattr.c
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* Routines for Baseline Privacy Key Management Attributes dissection
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* Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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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 <epan/packet.h>
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/* BPKM Attributes defined in:
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* http://www.cablemodem.com/downloads/specs/SP-BPI+_I10-030730.pdf
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*/
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#define BPKM_RESERVED 0
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#define BPKM_SERIAL_NUM 1
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#define BPKM_MANUFACTURER_ID 2
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#define BPKM_MAC_ADDR 3
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#define BPKM_RSA_PUB_KEY 4
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#define BPKM_CM_ID 5
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#define BPKM_DISPLAY_STR 6
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#define BPKM_AUTH_KEY 7
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#define BPKM_TEK 8
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#define BPKM_KEY_LIFETIME 9
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#define BPKM_KEY_SEQ_NUM 10
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#define BPKM_HMAC_DIGEST 11
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#define BPKM_SAID 12
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#define BPKM_TEK_PARAM 13
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#define BPKM_OBSOLETED 14
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#define BPKM_CBC_IV 15
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#define BPKM_ERROR_CODE 16
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#define BPKM_CA_CERT 17
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#define BPKM_CM_CERT 18
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#define BPKM_SEC_CAPABILITIES 19
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#define BPKM_CRYPTO_SUITE 20
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#define BPKM_CRYPTO_SUITE_LIST 21
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#define BPKM_BPI_VERSION 22
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#define BPKM_SA_DESCRIPTOR 23
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#define BPKM_SA_TYPE 24
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#define BPKM_SA_QUERY 25
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#define BPKM_SA_QUERY_TYPE 26
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#define BPKM_IP_ADDRESS 27
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#define BPKM_DNLD_PARAMS 28
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#define BPKM_VENDOR_DEFINED 127
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/* Initialize the protocol and registered fields */
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static int proto_docsis_bpkmattr = -1;
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static int hf_docsis_bpkmattr_serial_num = -1;
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static int hf_docsis_bpkmattr_manf_id = -1;
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static int hf_docsis_bpkmattr_mac_addr = -1;
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static int hf_docsis_bpkmattr_rsa_pub_key = -1;
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static int hf_docsis_bpkmattr_cm_id = -1;
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static int hf_docsis_bpkmattr_display_str = -1;
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static int hf_docsis_bpkmattr_auth_key = -1;
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static int hf_docsis_bpkmattr_tek = -1;
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static int hf_docsis_bpkmattr_key_life = -1;
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static int hf_docsis_bpkmattr_key_seq = -1;
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static int hf_docsis_bpkmattr_hmac_digest = -1;
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static int hf_docsis_bpkmattr_said = -1;
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static int hf_docsis_bpkmattr_tek_params = -1;
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static int hf_docsis_bpkmattr_cbc_iv = -1;
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static int hf_docsis_bpkmattr_error_code = -1;
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static int hf_docsis_bpkmattr_vendor_def = -1;
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static int hf_docsis_bpkmattr_ca_cert = -1;
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static int hf_docsis_bpkmattr_cm_cert = -1;
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static int hf_docsis_bpkmattr_security_cap = -1;
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static int hf_docsis_bpkmattr_crypto_suite = -1;
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static int hf_docsis_bpkmattr_crypto_suite_list = -1;
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static int hf_docsis_bpkmattr_bpi_version = -1;
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static int hf_docsis_bpkmattr_sa_descr = -1;
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static int hf_docsis_bpkmattr_sa_type = -1;
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static int hf_docsis_bpkmattr_sa_query = -1;
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static int hf_docsis_bpkmattr_sa_query_type = -1;
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static int hf_docsis_bpkmattr_ip_address = -1;
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static int hf_docsis_bpkmattr_download_param = -1;
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/* Initialize the subtree pointers */
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static gint ett_docsis_bpkmattr = -1;
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static gint ett_docsis_bpkmattr_cmid = -1;
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static gint ett_docsis_bpkmattr_scap = -1;
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static gint ett_docsis_bpkmattr_tekp = -1;
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static gint ett_docsis_bpkmattr_sadsc = -1;
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static gint ett_docsis_bpkmattr_saqry = -1;
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static gint ett_docsis_bpkmattr_dnld = -1;
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static const value_string error_code_vals[] = {
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{0, "no information"},
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{1, "Unauthorized CM"},
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{2, "Unauthorized SAID"},
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{3, "Unsolicited"},
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{4, "Invalid Key Sequence Number"},
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{5, "Key Request authentication failure"},
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{6, "Permanent Authorization Failure"},
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{7, "Not authorized for requested downstream traffic flow"},
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{8, "Downstream traffic flow not mapped to BPI+ SAID"},
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{9, "Time of day not acquired"},
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{0, NULL},
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};
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static const value_string crypto_suite_attr_vals[] = {
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{0x0100, "CBC Mode, 56 Bit DES & no Data Authentication"},
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{0x0200, "CBC Mode, 40 Bit DES & no Data Authentication"},
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{0, NULL},
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};
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static const value_string bpi_ver_vals[] = {
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{0, "Reserved"},
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{1, "BPI+"},
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{0, NULL},
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};
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/* Code to actually dissect the packets */
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/* The dissect_attrs() function does the actual work to dissect the
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* attributes. It's called recursively, to dissect embedded attributes
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*/
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static void
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dissect_attrs (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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guint8 type;
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guint16 length;
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int pos = 0;
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gint total_len;
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proto_item *cmid_it, *tekp_it, *scap_it;
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proto_item *saqry_it, *dnld_it, *sadsc_it;
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proto_tree *cmid_tree, *tekp_tree, *scap_tree;
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proto_tree *saqry_tree, *dnld_tree, *sadsc_tree;
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tvbuff_t *cmid_tvb, *tekp_tvb, *scap_tvb;
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tvbuff_t *saqry_tvb, *dnld_tvb, *sadsc_tvb;
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total_len = tvb_reported_length_remaining (tvb, 0);
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while (pos < total_len)
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{
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type = tvb_get_guint8 (tvb, pos++);
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length = tvb_get_ntohs (tvb, pos);
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pos += 2;
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switch (type)
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{
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case BPKM_RESERVED:
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break;
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case BPKM_SERIAL_NUM:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_serial_num, tvb, pos,
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length, FALSE);
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break;
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case BPKM_MANUFACTURER_ID:
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if (length == 3)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_manf_id, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_MAC_ADDR:
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if (length == 6)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_mac_addr, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_RSA_PUB_KEY:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_rsa_pub_key, tvb, pos,
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length, FALSE);
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break;
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case BPKM_CM_ID:
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cmid_it =
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proto_tree_add_text (tree, tvb, pos, length,
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"5 CM Identification");
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cmid_tree =
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proto_item_add_subtree (cmid_it, ett_docsis_bpkmattr_cmid);
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cmid_tvb = tvb_new_subset (tvb, pos, length, length);
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dissect_attrs (cmid_tvb, pinfo, cmid_tree);
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break;
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case BPKM_DISPLAY_STR:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_display_str, tvb, pos,
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length, FALSE);
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break;
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case BPKM_AUTH_KEY:
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if ((length == 96) || (length == 128))
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proto_tree_add_item (tree, hf_docsis_bpkmattr_auth_key, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_TEK:
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if (length == 8)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_tek, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_KEY_LIFETIME:
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if (length == 4)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_key_life, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_KEY_SEQ_NUM:
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if (length == 1)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_key_seq, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_HMAC_DIGEST:
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if (length == 20)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_hmac_digest, tvb,
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pos, length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_SAID:
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if (length == 2)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_said, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_TEK_PARAM:
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tekp_it =
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proto_tree_add_text (tree, tvb, pos, length, "13 TEK Parameters");
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tekp_tree =
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proto_item_add_subtree (tekp_it, ett_docsis_bpkmattr_tekp);
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tekp_tvb = tvb_new_subset (tvb, pos, length, length);
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dissect_attrs (tekp_tvb, pinfo, tekp_tree);
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break;
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case BPKM_OBSOLETED:
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break;
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case BPKM_CBC_IV:
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if (length == 8)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_cbc_iv, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_ERROR_CODE:
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if (length == 1)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_error_code, tvb,
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pos, length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_CA_CERT:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_ca_cert, tvb, pos,
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length, FALSE);
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break;
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case BPKM_CM_CERT:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_cm_cert, tvb, pos,
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length, FALSE);
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break;
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case BPKM_SEC_CAPABILITIES:
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scap_it =
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proto_tree_add_text (tree, tvb, pos, length,
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"19 Security Capabilities");
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scap_tree =
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proto_item_add_subtree (scap_it, ett_docsis_bpkmattr_scap);
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scap_tvb = tvb_new_subset (tvb, pos, length, length);
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dissect_attrs (scap_tvb, pinfo, scap_tree);
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break;
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case BPKM_CRYPTO_SUITE:
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if (length == 2)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_crypto_suite, tvb,
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pos, length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_CRYPTO_SUITE_LIST:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_crypto_suite_list,
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tvb, pos, length, FALSE);
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break;
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case BPKM_BPI_VERSION:
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if (length == 1)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_bpi_version, tvb,
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pos, length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_SA_DESCRIPTOR:
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sadsc_it =
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proto_tree_add_text (tree, tvb, pos, length, "23 SA Descriptor");
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sadsc_tree =
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proto_item_add_subtree (sadsc_it, ett_docsis_bpkmattr_sadsc);
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sadsc_tvb = tvb_new_subset (tvb, pos, length, length);
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dissect_attrs (sadsc_tvb, pinfo, sadsc_tree);
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break;
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case BPKM_SA_TYPE:
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if (length == 1)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_sa_type, tvb, pos,
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length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_SA_QUERY:
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saqry_it =
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proto_tree_add_text (tree, tvb, pos, length, "25 SA Query");
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saqry_tree =
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proto_item_add_subtree (saqry_it, ett_docsis_bpkmattr_saqry);
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saqry_tvb = tvb_new_subset (tvb, pos, length, length);
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dissect_attrs (saqry_tvb, pinfo, saqry_tree);
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break;
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case BPKM_SA_QUERY_TYPE:
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if (length == 1)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_sa_query_type, tvb,
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pos, length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_IP_ADDRESS:
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if (length == 4)
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proto_tree_add_item (tree, hf_docsis_bpkmattr_ip_address, tvb,
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pos, length, FALSE);
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else
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THROW (ReportedBoundsError);
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break;
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case BPKM_VENDOR_DEFINED:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_vendor_def, tvb, pos,
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length, FALSE);
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case BPKM_DNLD_PARAMS:
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dnld_it =
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proto_tree_add_text (tree, tvb, pos, length,
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"28 Download Parameters");
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dnld_tree =
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proto_item_add_subtree (dnld_it, ett_docsis_bpkmattr_dnld);
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dnld_tvb = tvb_new_subset (tvb, pos, length, length);
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dissect_attrs (dnld_tvb, pinfo, dnld_tree);
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break;
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default:
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proto_tree_add_item (tree, hf_docsis_bpkmattr_vendor_def, tvb, pos,
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length, FALSE);
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break;
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}
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pos += length; /* switch */
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} /* while */
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}
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static void
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dissect_bpkmattr (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
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{
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proto_item *it;
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proto_tree *bpkmattr_tree;
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if (tree)
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{
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it =
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proto_tree_add_protocol_format (tree, proto_docsis_bpkmattr, tvb, 0, -1,
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"BPKM Attributes");
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bpkmattr_tree = proto_item_add_subtree (it, ett_docsis_bpkmattr);
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dissect_attrs (tvb, pinfo, bpkmattr_tree);
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}
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}
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/* Register the protocol with Wireshark */
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/* this format is require because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_docsis_bpkmattr (void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{&hf_docsis_bpkmattr_serial_num,
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{"1 Serial Number", "docsis_bpkmattr.serialnum",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Serial Number", HFILL}
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},
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{&hf_docsis_bpkmattr_manf_id,
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{"2 Manufacturer Id", "docsis_bpkmattr.manfid",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Manufacturer Id", HFILL}
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},
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{&hf_docsis_bpkmattr_mac_addr,
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{"3 Mac Address", "docsis_bpkmattr.macaddr",
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FT_ETHER, BASE_NONE, NULL, 0x0,
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"Mac Address", HFILL}
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},
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{&hf_docsis_bpkmattr_rsa_pub_key,
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{"4 RSA Public Key", "docsis_bpkmattr.rsa_pub_key",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"RSA Public Key", HFILL}
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},
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{&hf_docsis_bpkmattr_cm_id,
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{"5 CM Identification", "docsis_bpkmattr.cmid",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"CM Identification", HFILL}
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},
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{&hf_docsis_bpkmattr_display_str,
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{"6 Display String", "docsis_bpkmattr.dispstr",
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FT_STRING, BASE_NONE, NULL, 0x0,
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"Display String", HFILL}
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},
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{&hf_docsis_bpkmattr_auth_key,
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{"7 Auth Key", "docsis_bpkmattr.auth_key",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Auth Key", HFILL}
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},
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{&hf_docsis_bpkmattr_tek,
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{"8 Traffic Encryption Key", "docsis_bpkmattr.tek",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Traffic Encryption Key", HFILL}
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},
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{&hf_docsis_bpkmattr_key_life,
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{"9 Key Lifetime (s)", "docsis_bpkmattr.keylife",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Key Lifetime (s)", HFILL}
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},
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{&hf_docsis_bpkmattr_key_seq,
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{"10 Key Sequence Number", "docsis_bpkmattr.keyseq",
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FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Key Sequence Number", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_hmac_digest,
|
|
{"11 HMAC Digest", "docsis_bpkmattr.hmacdigest",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"HMAC Digest", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_said,
|
|
{"12 SAID", "docsis_bpkmattr.said",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Security Association ID", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_tek_params,
|
|
{"13 TEK Parameters", "docsis_bpkmattr.tekparams",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"TEK Parameters", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_cbc_iv,
|
|
{"14 CBC IV", "docsis_bpkmattr.cbciv",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Cypher Block Chaining", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_error_code,
|
|
{"16 Error Code", "docsis_bpkmattr.errcode",
|
|
FT_UINT8, BASE_DEC, VALS (error_code_vals), 0x0,
|
|
"Error Code", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_vendor_def,
|
|
{"127 Vendor Defined", "docsis_bpkmattr.vendordef",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Vendor Defined", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_ca_cert,
|
|
{"17 CA Certificate", "docsis_bpkmattr.cacert",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"CA Certificate", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_cm_cert,
|
|
{"18 CM Certificate", "docsis_bpkmattr.cmcert",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"CM Certificate", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_security_cap,
|
|
{"19 Security Capabilities", "docsis_bpkmattr.seccap",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Security Capabilities", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_crypto_suite,
|
|
{"20 Cryptographic Suite", "docsis_bpkmattr.cryptosuite",
|
|
FT_UINT16, BASE_HEX, VALS(crypto_suite_attr_vals), 0x0,
|
|
"Cryptographic Suite", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_crypto_suite_list,
|
|
{"21 Cryptographic Suite List", "docsis_bpkmattr.crypto_suite_lst",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Cryptographic Suite", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_bpi_version,
|
|
{"22 BPI Version", "docsis_bpkmattr.bpiver",
|
|
FT_UINT8, BASE_DEC, VALS (bpi_ver_vals), 0x0,
|
|
"BPKM Attributes", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_sa_descr,
|
|
{"23 SA Descriptor", "docsis_bpkmattr.sadescr",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"SA Descriptor", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_sa_type,
|
|
{"24 SA Type", "docsis_bpkmattr.satype",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"SA Type", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_sa_query,
|
|
{"25 SA Query", "docsis_bpkmattr.saquery",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"SA Query", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_sa_query_type,
|
|
{"26 SA Query Type", "docsis_bpkmattr.saquery_type",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
"SA Query Type", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_ip_address,
|
|
{"27 IP Address", "docsis_bpkmattr.ipaddr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
"IP Address", HFILL}
|
|
},
|
|
{&hf_docsis_bpkmattr_download_param,
|
|
{"28 Download Parameters", "docsis_bpkmattr.dnld_params",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Download Parameters", HFILL}
|
|
},
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_docsis_bpkmattr,
|
|
&ett_docsis_bpkmattr_cmid,
|
|
&ett_docsis_bpkmattr_scap,
|
|
&ett_docsis_bpkmattr_tekp,
|
|
&ett_docsis_bpkmattr_sadsc,
|
|
&ett_docsis_bpkmattr_saqry,
|
|
&ett_docsis_bpkmattr_dnld
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_docsis_bpkmattr =
|
|
proto_register_protocol
|
|
("DOCSIS Baseline Privacy Key Management Attributes", "DOCSIS BPKM-ATTR",
|
|
"docsis_bpkmattr");
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array (proto_docsis_bpkmattr, hf, array_length (hf));
|
|
proto_register_subtree_array (ett, array_length (ett));
|
|
|
|
register_dissector ("docsis_bpkmattr", dissect_bpkmattr,
|
|
proto_docsis_bpkmattr);
|
|
}
|
|
|
|
|
|
/* If this dissector uses sub-dissector registration add a registration routine.
|
|
This format is required because a script is used to find these routines and
|
|
create the code that calls these routines.
|
|
*/
|
|
void
|
|
proto_reg_handoff_docsis_bpkmattr (void)
|
|
{
|
|
#if 0
|
|
dissector_handle_t docsis_bpkmattr_handle;
|
|
|
|
docsis_bpkmattr_handle = find_dissector ("docsis_bpkmattr");
|
|
dissector_add_uint ("docsis", 0xFE, docsis_bpkmattr_handle);
|
|
#endif
|
|
|
|
}
|