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wireshark/plugins/docsis/packet-bpkmattr.c

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/* packet-bpkmattr.c
* Routines for Baseline Privacy Key Management Attributes dissection
* Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "moduleinfo.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gmodule.h>
#include <epan/packet.h>
/* BPKM Attributes defined in:
* http://www.cablemodem.com/downloads/specs/SP-BPI+_I10-030730.pdf
*/
#define BPKM_RESERVED 0
#define BPKM_SERIAL_NUM 1
#define BPKM_MANUFACTURER_ID 2
#define BPKM_MAC_ADDR 3
#define BPKM_RSA_PUB_KEY 4
#define BPKM_CM_ID 5
#define BPKM_DISPLAY_STR 6
#define BPKM_AUTH_KEY 7
#define BPKM_TEK 8
#define BPKM_KEY_LIFETIME 9
#define BPKM_KEY_SEQ_NUM 10
#define BPKM_HMAC_DIGEST 11
#define BPKM_SAID 12
#define BPKM_TEK_PARAM 13
#define BPKM_OBSOLETED 14
#define BPKM_CBC_IV 15
#define BPKM_ERROR_CODE 16
#define BPKM_CA_CERT 17
#define BPKM_CM_CERT 18
#define BPKM_SEC_CAPABILITIES 19
#define BPKM_CRYPTO_SUITE 20
#define BPKM_CRYPTO_SUITE_LIST 21
#define BPKM_BPI_VERSION 22
#define BPKM_SA_DESCRIPTOR 23
#define BPKM_SA_TYPE 24
#define BPKM_SA_QUERY 25
#define BPKM_SA_QUERY_TYPE 26
#define BPKM_IP_ADDRESS 27
#define BPKM_DNLD_PARAMS 28
#define BPKM_VENDOR_DEFINED 127
/* Initialize the protocol and registered fields */
static int proto_docsis_bpkmattr = -1;
static int hf_docsis_bpkmattr = -1;
static int hf_docsis_bpkmattr_serial_num = -1;
static int hf_docsis_bpkmattr_manf_id = -1;
static int hf_docsis_bpkmattr_mac_addr = -1;
static int hf_docsis_bpkmattr_rsa_pub_key = -1;
static int hf_docsis_bpkmattr_cm_id = -1;
static int hf_docsis_bpkmattr_display_str = -1;
static int hf_docsis_bpkmattr_auth_key = -1;
static int hf_docsis_bpkmattr_tek = -1;
static int hf_docsis_bpkmattr_key_life = -1;
static int hf_docsis_bpkmattr_key_seq = -1;
static int hf_docsis_bpkmattr_hmac_digest = -1;
static int hf_docsis_bpkmattr_said = -1;
static int hf_docsis_bpkmattr_tek_params = -1;
static int hf_docsis_bpkmattr_cbc_iv = -1;
static int hf_docsis_bpkmattr_error_code = -1;
static int hf_docsis_bpkmattr_vendor_def = -1;
static int hf_docsis_bpkmattr_ca_cert = -1;
static int hf_docsis_bpkmattr_cm_cert = -1;
static int hf_docsis_bpkmattr_security_cap = -1;
static int hf_docsis_bpkmattr_crypto_suite = -1;
static int hf_docsis_bpkmattr_crypto_suite_list = -1;
static int hf_docsis_bpkmattr_bpi_version = -1;
static int hf_docsis_bpkmattr_sa_descr = -1;
static int hf_docsis_bpkmattr_sa_type = -1;
static int hf_docsis_bpkmattr_sa_query = -1;
static int hf_docsis_bpkmattr_sa_query_type = -1;
static int hf_docsis_bpkmattr_ip_address = -1;
static int hf_docsis_bpkmattr_download_param = -1;
/* Initialize the subtree pointers */
static gint ett_docsis_bpkmattr = -1;
static gint ett_docsis_bpkmattr_cmid = -1;
static gint ett_docsis_bpkmattr_scap = -1;
static gint ett_docsis_bpkmattr_tekp = -1;
static gint ett_docsis_bpkmattr_sadsc = -1;
static gint ett_docsis_bpkmattr_saqry = -1;
static gint ett_docsis_bpkmattr_dnld = -1;
static const value_string error_code_vals[] = {
{0, "no information"},
{1, "Unauthorized CM"},
{2, "Unauthorized SAID"},
{3, "Unsolicited"},
{4, "Invalid Key Sequence Number"},
{5, "Key Request authentication failure"},
{6, "Permanent Authorization Failure"},
{7, "Not authorized for requested downstream traffic flow"},
{8, "Downstream traffic flow not mapped to BPI+ SAID"},
{9, "Time of day not acquired"},
{0, NULL},
};
static const value_string crypto_suite_attr_vals[] = {
{0x0100, "CBC Mode, 56 Bit DES & no Data Authentication"},
{0x0200, "CBC Mode, 40 Bit DES & no Data Authentication"},
{0, NULL},
};
static const value_string bpi_ver_vals[] = {
{0, "Reserved"},
{1, "BPI+"},
{0, NULL},
};
/* Code to actually dissect the packets */
/* The dissect_attrs() function does the actual work to dissect the
* attributes. It's called recursively, to dissect embedded attributes
*/
static void
dissect_attrs (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
guint8 type;
guint16 length;
int pos = 0;
gint total_len;
proto_item *cmid_it, *tekp_it, *scap_it;
proto_item *saqry_it, *dnld_it, *sadsc_it;
proto_tree *cmid_tree, *tekp_tree, *scap_tree;
proto_tree *saqry_tree, *dnld_tree, *sadsc_tree;
tvbuff_t *cmid_tvb, *tekp_tvb, *scap_tvb;
tvbuff_t *saqry_tvb, *dnld_tvb, *sadsc_tvb;
total_len = tvb_reported_length_remaining (tvb, 0);
while (pos < total_len)
{
type = tvb_get_guint8 (tvb, pos++);
length = tvb_get_ntohs (tvb, pos);
pos += 2;
switch (type)
{
case BPKM_RESERVED:
break;
case BPKM_SERIAL_NUM:
proto_tree_add_item (tree, hf_docsis_bpkmattr_serial_num, tvb, pos,
length, FALSE);
break;
case BPKM_MANUFACTURER_ID:
if (length == 3)
proto_tree_add_item (tree, hf_docsis_bpkmattr_manf_id, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_MAC_ADDR:
if (length == 6)
proto_tree_add_item (tree, hf_docsis_bpkmattr_mac_addr, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_RSA_PUB_KEY:
proto_tree_add_item (tree, hf_docsis_bpkmattr_rsa_pub_key, tvb, pos,
length, FALSE);
break;
case BPKM_CM_ID:
cmid_it =
proto_tree_add_text (tree, tvb, pos, length,
"5 CM Identification");
cmid_tree =
proto_item_add_subtree (cmid_it, ett_docsis_bpkmattr_cmid);
cmid_tvb = tvb_new_subset (tvb, pos, length, length);
dissect_attrs (cmid_tvb, pinfo, cmid_tree);
break;
case BPKM_DISPLAY_STR:
proto_tree_add_item (tree, hf_docsis_bpkmattr_display_str, tvb, pos,
length, FALSE);
break;
case BPKM_AUTH_KEY:
if ((length == 96) || (length == 128))
proto_tree_add_item (tree, hf_docsis_bpkmattr_auth_key, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_TEK:
if (length == 8)
proto_tree_add_item (tree, hf_docsis_bpkmattr_tek, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_KEY_LIFETIME:
if (length == 4)
proto_tree_add_item (tree, hf_docsis_bpkmattr_key_life, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_KEY_SEQ_NUM:
if (length == 1)
proto_tree_add_item (tree, hf_docsis_bpkmattr_key_seq, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_HMAC_DIGEST:
if (length == 20)
proto_tree_add_item (tree, hf_docsis_bpkmattr_hmac_digest, tvb,
pos, length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_SAID:
if (length == 2)
proto_tree_add_item (tree, hf_docsis_bpkmattr_said, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_TEK_PARAM:
tekp_it =
proto_tree_add_text (tree, tvb, pos, length, "13 TEK Parameters");
tekp_tree =
proto_item_add_subtree (tekp_it, ett_docsis_bpkmattr_tekp);
tekp_tvb = tvb_new_subset (tvb, pos, length, length);
dissect_attrs (tekp_tvb, pinfo, tekp_tree);
break;
case BPKM_OBSOLETED:
break;
case BPKM_CBC_IV:
if (length == 8)
proto_tree_add_item (tree, hf_docsis_bpkmattr_cbc_iv, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_ERROR_CODE:
if (length == 1)
proto_tree_add_item (tree, hf_docsis_bpkmattr_error_code, tvb,
pos, length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_CA_CERT:
proto_tree_add_item (tree, hf_docsis_bpkmattr_ca_cert, tvb, pos,
length, FALSE);
break;
case BPKM_CM_CERT:
proto_tree_add_item (tree, hf_docsis_bpkmattr_cm_cert, tvb, pos,
length, FALSE);
break;
case BPKM_SEC_CAPABILITIES:
scap_it =
proto_tree_add_text (tree, tvb, pos, length,
"19 Security Capabilities");
scap_tree =
proto_item_add_subtree (scap_it, ett_docsis_bpkmattr_scap);
scap_tvb = tvb_new_subset (tvb, pos, length, length);
dissect_attrs (scap_tvb, pinfo, scap_tree);
break;
case BPKM_CRYPTO_SUITE:
if (length == 2)
proto_tree_add_item (tree, hf_docsis_bpkmattr_crypto_suite, tvb,
pos, length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_CRYPTO_SUITE_LIST:
proto_tree_add_item (tree, hf_docsis_bpkmattr_crypto_suite_list,
tvb, pos, length, FALSE);
break;
case BPKM_BPI_VERSION:
if (length == 1)
proto_tree_add_item (tree, hf_docsis_bpkmattr_bpi_version, tvb,
pos, length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_SA_DESCRIPTOR:
sadsc_it =
proto_tree_add_text (tree, tvb, pos, length, "23 SA Descriptor");
sadsc_tree =
proto_item_add_subtree (sadsc_it, ett_docsis_bpkmattr_sadsc);
sadsc_tvb = tvb_new_subset (tvb, pos, length, length);
dissect_attrs (sadsc_tvb, pinfo, sadsc_tree);
break;
case BPKM_SA_TYPE:
if (length == 1)
proto_tree_add_item (tree, hf_docsis_bpkmattr_sa_type, tvb, pos,
length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_SA_QUERY:
saqry_it =
proto_tree_add_text (tree, tvb, pos, length, "25 SA Query");
saqry_tree =
proto_item_add_subtree (saqry_it, ett_docsis_bpkmattr_saqry);
saqry_tvb = tvb_new_subset (tvb, pos, length, length);
dissect_attrs (saqry_tvb, pinfo, saqry_tree);
break;
case BPKM_SA_QUERY_TYPE:
if (length == 1)
proto_tree_add_item (tree, hf_docsis_bpkmattr_sa_query_type, tvb,
pos, length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_IP_ADDRESS:
if (length == 4)
proto_tree_add_item (tree, hf_docsis_bpkmattr_ip_address, tvb,
pos, length, FALSE);
else
THROW (ReportedBoundsError);
break;
case BPKM_VENDOR_DEFINED:
proto_tree_add_item (tree, hf_docsis_bpkmattr_vendor_def, tvb, pos,
length, FALSE);
case BPKM_DNLD_PARAMS:
dnld_it =
proto_tree_add_text (tree, tvb, pos, length,
"28 Download Parameters");
dnld_tree =
proto_item_add_subtree (dnld_it, ett_docsis_bpkmattr_dnld);
dnld_tvb = tvb_new_subset (tvb, pos, length, length);
dissect_attrs (dnld_tvb, pinfo, dnld_tree);
break;
default:
proto_tree_add_item (tree, hf_docsis_bpkmattr_vendor_def, tvb, pos,
length, FALSE);
break;
}
pos += length; /* switch */
} /* while */
}
static void
dissect_bpkmattr (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
proto_item *it;
proto_tree *bpkmattr_tree;
if (tree)
{
it =
proto_tree_add_protocol_format (tree, proto_docsis_bpkmattr, tvb, 0, -1,
"BPKM Attributes");
bpkmattr_tree = proto_item_add_subtree (it, ett_docsis_bpkmattr);
dissect_attrs (tvb, pinfo, bpkmattr_tree);
}
}
/* Register the protocol with Wireshark */
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_docsis_bpkmattr (void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{&hf_docsis_bpkmattr,
{"BPKM Attributes", "docsis.bpkmattr",
FT_BYTES, BASE_HEX, NULL, 0x0,
"BPKM Attributes", HFILL}
},
{&hf_docsis_bpkmattr_serial_num,
{"1 Serial Number", "docsis.bpkmattr.serialnum",
FT_STRING, BASE_DEC, NULL, 0x0,
"Serial Number", HFILL}
},
{&hf_docsis_bpkmattr_manf_id,
{"2 Manufacturer Id", "docsis.bpkmattr.manfid",
FT_BYTES, BASE_HEX, NULL, 0x0,
"Manufacturer Id", HFILL}
},
{&hf_docsis_bpkmattr_mac_addr,
{"3 Mac Address", "docsis.bpkmattr.macaddr",
FT_ETHER, BASE_HEX, NULL, 0x0,
"Mac Address", HFILL}
},
{&hf_docsis_bpkmattr_rsa_pub_key,
{"4 RSA Public Key", "docsis.bpkmattr.rsa_pub_key",
FT_BYTES, BASE_HEX, NULL, 0x0,
"RSA Public Key", HFILL}
},
{&hf_docsis_bpkmattr_cm_id,
{"5 CM Identification", "docsis.bpkmattr.cmid",
FT_BYTES, BASE_HEX, NULL, 0x0,
"CM Identification", HFILL}
},
{&hf_docsis_bpkmattr_display_str,
{"6 Display String", "docsis.bpkmattr.dispstr",
FT_STRING, BASE_DEC, NULL, 0x0,
"Display String", HFILL}
},
{&hf_docsis_bpkmattr_auth_key,
{"7 Auth Key", "docsis.bpkmattr.auth_key",
FT_BYTES, BASE_HEX, NULL, 0x0,
"Auth Key", HFILL}
},
{&hf_docsis_bpkmattr_tek,
{"8 Traffic Encryption Key", "docsis.bpkmattr.tek",
FT_BYTES, BASE_HEX, NULL, 0x0,
"Traffic Encryption Key", HFILL}
},
{&hf_docsis_bpkmattr_key_life,
{"9 Key Lifetime (s)", "docsis.bpkmattr.keylife",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Key Lifetime (s)", HFILL}
},
{&hf_docsis_bpkmattr_key_seq,
{"10 Key Sequence Number", "docsis.bpkmattr.keyseq",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Key Sequence Number", HFILL}
},
{&hf_docsis_bpkmattr_hmac_digest,
{"11 HMAC Digest", "docsis.bpkmattr.hmacdigest",
FT_BYTES, BASE_HEX, 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_HEX, NULL, 0x0,
"TEK Parameters", HFILL}
},
{&hf_docsis_bpkmattr_cbc_iv,
{"14 CBC IV", "docsis.bpkmattr.cbciv",
FT_BYTES, BASE_HEX, 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_HEX, NULL, 0x0,
"Vendor Defined", HFILL}
},
{&hf_docsis_bpkmattr_ca_cert,
{"17 CA Certificate", "docsis.bpkmattr.cacert",
FT_BYTES, BASE_HEX, NULL, 0x0,
"CA Certificate", HFILL}
},
{&hf_docsis_bpkmattr_cm_cert,
{"18 CM Certificate", "docsis.bpkmattr.cmcert",
FT_BYTES, BASE_HEX, NULL, 0x0,
"CM Certificate", HFILL}
},
{&hf_docsis_bpkmattr_security_cap,
{"19 Security Capabilities", "docsis.bpkmattr.seccap",
FT_BYTES, BASE_HEX, 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_HEX, 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_HEX, 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_HEX, 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_DEC, NULL, 0x0,
"IP Address", HFILL}
},
{&hf_docsis_bpkmattr_download_param,
{"28 Download Parameters", "docsis.bpkmattr.dnld_params",
FT_BYTES, BASE_HEX, 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)
{
dissector_handle_t docsis_bpkmattr_handle;
docsis_bpkmattr_handle = find_dissector ("docsis_bpkmattr");
dissector_add ("docsis", 0xFE, docsis_bpkmattr_handle);
}
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