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/* packet-rfid-mifare.c
* Dissector for the NXP MiFare Protocol
*
* References:
* http://code.google.com/p/nfc-tools/source/browse/trunk/libfreefare/libfreefare/mifare_classic.c
* http://www.nxp.com/documents/data_sheet/MF1S703x.pdf
* http://www.nxp.com/documents/application_note/AN1304.pdf
*
* Copyright 2011, Tyson Key <tyson.key@gmail.com>
*
* $Id$
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
void proto_register_mifare(void);
void proto_reg_handoff_mifare(void);
static int proto_mifare = -1;
static int hf_mifare_command = -1;
static int hf_mifare_block_address = -1;
static int hf_mifare_key_a = -1;
static int hf_mifare_key_b = -1;
static int hf_mifare_uid = -1;
static int hf_mifare_operand = -1;
#define AUTH_A 0x60
#define AUTH_B 0x61
#define READ 0x30
#define WRITE 0xA0
#define TRANSFER 0xB0
#define DECREMENT 0xC0
#define INCREMENT 0xC1
#define RESTORE 0xC2
static const value_string hf_mifare_commands[] = {
{AUTH_A, "AUTH_A"},
{AUTH_B, "AUTH_B"},
{READ, "READ"},
{WRITE, "WRITE"},
{TRANSFER, "TRANSFER"},
{DECREMENT, "DECREMENT"},
{INCREMENT, "INCREMENT"},
{RESTORE, "RESTORE"},
/* End of commands */
{0x00, NULL}
};
static dissector_handle_t data_handle;
/* Subtree handles: set by register_subtree_array */
static gint ett_mifare = -1;
static void
dissect_mifare(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *item;
proto_tree *mifare_tree;
guint8 cmd;
tvbuff_t *next_tvb = NULL;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MiFare");
col_set_str(pinfo->cinfo, COL_INFO, "MiFare Packet");
if (tree) {
/* Start with a top-level item to add everything else to */
item = proto_tree_add_item(tree, proto_mifare, tvb, 0, -1, ENC_NA);
mifare_tree = proto_item_add_subtree(item, ett_mifare);
proto_tree_add_item(mifare_tree, hf_mifare_command, tvb, 0, 1, ENC_NA);
cmd = tvb_get_guint8(tvb, 0);
switch (cmd) {
case AUTH_A:
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mifare_tree, hf_mifare_key_a, tvb, 2, 6, ENC_BIG_ENDIAN);
proto_tree_add_item(mifare_tree, hf_mifare_uid, tvb, 8, 4, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Authenticate with Key A");
break;
case AUTH_B:
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mifare_tree, hf_mifare_key_b, tvb, 2, 6, ENC_BIG_ENDIAN);
proto_tree_add_item(mifare_tree, hf_mifare_uid, tvb, 8, 4, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Authenticate with Key B");
break;
case READ:
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Read");
break;
case WRITE:
col_set_str(pinfo->cinfo, COL_INFO, "Write");
/* LibNFC and the TouchATag-branded reader don't expose the 2-byte CRC
or 4-bit NAK, as per MF1S703x, so we pretend that they don't exist.
I've never seen traces with those data structures before, either... */
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
/* Because we don't know what the user will write, just let Data have away
with the rest of the packet's contents for now. */
next_tvb = tvb_new_subset_remaining(tvb, 2);
call_dissector(data_handle, next_tvb, pinfo, tree);
break;
case TRANSFER:
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Transfer");
break;
case DECREMENT:
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Decrement");
break;
case INCREMENT:
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Increment");
break;
case RESTORE:
proto_tree_add_item(mifare_tree, hf_mifare_block_address, tvb, 1, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mifare_tree, hf_mifare_operand, tvb, 2, 4, ENC_BIG_ENDIAN);
col_set_str(pinfo->cinfo, COL_INFO, "Restore");
break;
default:
col_set_str(pinfo->cinfo, COL_INFO, "Unknown");
break;
}
}
}
void
proto_register_mifare(void)
{
static hf_register_info hf[] = {
{&hf_mifare_command,
{ "Command", "mifare.cmd", FT_UINT8, BASE_HEX,
VALS(hf_mifare_commands), 0x0, NULL, HFILL }},
{&hf_mifare_block_address,
{ "Block Address", "mifare.block.addr", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{&hf_mifare_key_a,
{ "Key A", "mifare.key.a", FT_UINT64, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{&hf_mifare_key_b,
{ "Key B", "mifare.key.b", FT_UINT64, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{&hf_mifare_uid,
{ "UID", "mifare.uid", FT_UINT32, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{&hf_mifare_operand,
{ "Operand", "mifare.operand", FT_INT32, BASE_DEC,
NULL, 0x0, NULL, HFILL }}
};
static gint *ett[] = {
&ett_mifare
};
proto_mifare = proto_register_protocol("NXP MiFare", "MiFare", "mifare");
proto_register_field_array(proto_mifare, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("mifare", dissect_mifare, proto_mifare);
}
/* Handler registration */
void
proto_reg_handoff_mifare(void)
{
data_handle = find_dissector("data");
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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