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wireshark/epan/dissectors/packet-iso7816.c

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/* packet-iso7816.c
* Routines for packet dissection of generic ISO 7816 smart card messages
* Copyright 2012-2013 by Martin Kaiser <martin@kaiser.cx>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* This dissector supports the command and response apdu structure
* as defined in ISO 7816-4. Detailed dissection of the APDUs defined
* in the ISO 7816 specifications will be added in the future.
*
* The dissection of Answer To Reset (ATR) messages was made a separate
* protocol so that it can be shared easily.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/decode_as.h>
void proto_register_iso7816(void);
void proto_reg_handoff_iso7816(void);
static int proto_iso7816 = -1;
static int proto_iso7816_atr = -1;
static dissector_handle_t iso7816_handle;
static dissector_handle_t iso7816_atr_handle;
static wmem_tree_t *transactions = NULL;
static dissector_table_t iso7816_apdu_pld_table;
static int ett_iso7816 = -1;
static int ett_iso7816_class = -1;
static int ett_iso7816_param = -1;
static int ett_iso7816_p1 = -1;
static int ett_iso7816_p2 = -1;
static int ett_iso7816_atr = -1;
static int ett_iso7816_atr_ta = -1;
static int ett_iso7816_atr_td = -1;
static int hf_iso7816_atr_init_char = -1;
static int hf_iso7816_atr_t0 = -1;
static int hf_iso7816_atr_ta = -1;
/* these two fields hold the converted values Fi and Di,
not the binary representations FI and DI */
static int hf_iso7816_atr_ta1_fi = -1;
static int hf_iso7816_atr_ta1_di = -1;
static int hf_iso7816_atr_tb = -1;
static int hf_iso7816_atr_tc = -1;
static int hf_iso7816_atr_td = -1;
static int hf_iso7816_atr_next_ta_present = -1;
static int hf_iso7816_atr_next_tb_present = -1;
static int hf_iso7816_atr_next_tc_present = -1;
static int hf_iso7816_atr_next_td_present = -1;
static int hf_iso7816_atr_k = -1;
static int hf_iso7816_atr_t = -1;
static int hf_iso7816_atr_hist_bytes = -1;
static int hf_iso7816_atr_tck = -1;
static int hf_iso7816_resp_in = -1;
static int hf_iso7816_resp_to = -1;
static int hf_iso7816_cla = -1;
static int hf_iso7816_cla_sm = -1;
static int hf_iso7816_cla_channel = -1;
static int hf_iso7816_ins = -1;
static int hf_iso7816_p1 = -1;
static int hf_iso7816_p2 = -1;
static int hf_iso7816_lc = -1;
static int hf_iso7816_le = -1;
static int hf_iso7816_body = -1;
static int hf_iso7816_sw1 = -1;
static int hf_iso7816_sw2 = -1;
static int hf_iso7816_sel_file_ctrl = -1;
static int hf_iso7816_sel_file_fci_req = -1;
static int hf_iso7816_sel_file_occ = -1;
static int hf_iso7816_read_rec_ef = -1;
static int hf_iso7816_read_rec_usage = -1;
static int hf_iso7816_get_resp = -1;
static int hf_iso7816_offset_first_byte = -1;
static int hf_iso7816_rfu = -1;
static int hf_iso7816_application_data = -1;
static expert_field ie_iso7816_atr_tck_not1 = EI_INIT;
#define ADDR_INTF "Interface"
#define ADDR_CARD "Card"
typedef struct _iso7816_transaction_t {
guint32 cmd_frame;
guint32 resp_frame;
guint8 cmd_ins; /* instruction byte in the command apdu */
/* no need to add the channel number,
the response contains no channel number to compare this to
and the spec explicitly prohibits interleaving of command-response
pairs, regardless of logical channels */
dissector_handle_t handle;
} iso7816_transaction_t;
static const value_string iso7816_atr_init_char[] = {
{ 0x3B, "Direct convention (A==0, Z==1, MSB==m9)" },
{ 0x3F, "Inverse convention (A==1, Z==0, MSB==m2)" },
{ 0, NULL }
};
static const value_string iso7816_cla_sm[] = {
{ 0x00, "No SM" },
{ 0x01, "Proprietary SM" },
{ 0x02, "SM, command header not authenticated" },
{ 0x03, "SM, command header authenticated" },
{ 0, NULL }
};
#define INS_ERASE_BIN 0x0E
#define INS_VRFY 0x20
#define INS_MANAGE_CHANNEL 0x70
#define INS_EXT_AUTH 0x82
#define INS_GET_CHALLENGE 0x84
#define INS_SELECT_FILE 0xA4
#define INS_READ_BIN 0xB0
#define INS_READ_REC 0xB2
#define INS_GET_RESP 0xC0
#define INS_ENVELOPE 0xC2
#define INS_GET_DATA 0xCA
#define INS_WRITE_BIN 0xD0
#define INS_WRITE_REC 0xD2
#define INS_UPDATE_BIN 0xD6
#define INS_PUT_DATA 0xDA
#define INS_UPDATE_REC 0xDC
#define INS_APPEND_REC 0xE2
/* for our transaction tracking, not defined in the specification */
#define INS_INVALID 0x00
static const value_string iso7816_ins[] = {
/* instructions defined in ISO 7816-4 */
{ INS_ERASE_BIN, "Erase binary" },
{ INS_VRFY, "Verify" },
{ INS_MANAGE_CHANNEL, "Manage channel" },
{ INS_EXT_AUTH, "External authenticate" },
{ INS_GET_CHALLENGE, "Get challenge" },
{ INS_SELECT_FILE, "Select file" },
{ INS_READ_BIN, "Read binary" },
{ INS_READ_REC, "Read record" },
{ INS_GET_RESP, "Get response" },
{ INS_ENVELOPE, "Envelope" },
{ INS_GET_DATA, "Get data" },
{ INS_WRITE_BIN, "Write binary" },
{ INS_WRITE_REC, "Write record" },
{ INS_UPDATE_BIN, "Update binary" },
{ INS_PUT_DATA, "Put data" },
{ INS_UPDATE_REC, "Update record" },
{ INS_APPEND_REC, "Append record" },
{ 0, NULL }
};
static value_string_ext iso7816_ins_ext = VALUE_STRING_EXT_INIT(iso7816_ins);
static const value_string iso7816_sel_file_ctrl[] = {
{ 0x00, "Select MF, DF or EF" },
{ 0x01, "Select child DF" },
{ 0x02, "Select EF under current DF" },
{ 0x03, "Select parent DF of the current DF" },
{ 0x04, "Direct selection by DF name" },
{ 0x08, "Selection by path from MF" },
{ 0x09, "Selection by path from current DF" },
{ 0, NULL }
};
static value_string_ext ext_iso7816_sel_file_ctrl =
VALUE_STRING_EXT_INIT(iso7816_sel_file_ctrl);
static const value_string iso7816_sel_file_fci_req[] = {
{ 0x00, "Return FCI, optional template" },
{ 0x01, "Return FCP template" },
{ 0x02, "Return FMD template" },
{ 0, NULL }
};
static value_string_ext ext_iso7816_sel_file_fci_req =
VALUE_STRING_EXT_INIT(iso7816_sel_file_fci_req);
static const value_string iso7816_sel_file_occ[] = {
{ 0x00, "First or only occurrence" },
{ 0x01, "Last occurrence" },
{ 0x02, "Next occurrence" },
{ 0x03, "Previous occurrence" },
{ 0, NULL }
};
static value_string_ext ext_iso7816_sel_file_occ =
VALUE_STRING_EXT_INIT(iso7816_sel_file_occ);
#define READ_REC_USAGE_SINGLE 0x04
#define READ_REC_USAGE_START 0x05
static const value_string iso7816_read_rec_usage[] = {
{ READ_REC_USAGE_SINGLE, "Read record P1" },
{ READ_REC_USAGE_START, "Read all records from P1 up to the last" },
{ 0, NULL }
};
static value_string_ext ext_iso7816_read_rec_usage =
VALUE_STRING_EXT_INIT(iso7816_read_rec_usage);
static const range_string iso7816_sw1[] = {
{ 0x61, 0x61, "Normal processing" },
{ 0x62, 0x63, "Warning processing" },
{ 0x64, 0x65, "Execution error" },
{ 0x67, 0x6F, "Checking error" },
{ 0x90, 0x90, "Normal processing" },
{ 0,0, NULL }
};
static const range_string iso7816_class_rvals[] = {
{0x00, 0x0F, "structure and coding according to ISO/IEC 7816" },
{0x10, 0x7F, "reserved for future use" },
{0x80, 0x9F, "structure according to ISO/IEC 7816, coding is proprietary" },
{0xA0, 0xAF, "structure and coding according to ISO/IEC 7816 unless specified otherwise by the application context" },
{0xB0, 0xCF, "structure according to ISO/IEC 7816" },
{0xD0, 0xFE, "proprietary structure and coding" },
{0xFF, 0xFF, "reserved for Protocol Type Selection" },
{0, 0, NULL}
};
static const value_string unique_or_unused[] = {
{ 0, "or unused" },
{ 0, NULL }
};
static const value_string unique_max_num_available_bytes[] = {
{ 0, "maximum number of available bytes" },
{ 0, NULL }
};
static inline
guint16 FI_to_Fi(guint8 FI)
{
if (FI<=1)
return 372;
else if (FI<=6)
return (FI-1) * 372;
else if (FI==9)
return 512;
else if (FI==10)
return 768;
else if (FI==11)
return 1024;
else if (FI==12)
return 1536;
else if (FI==13)
return 2048;
return 0; /* 0 means RFU (reserved for future use) here */
}
static inline
guint8 DI_to_Di(guint8 DI)
{
if (DI>=1 && DI<=6)
return 1 << (DI-1);
else if (DI==8)
return 12;
else if (DI==9)
return 20;
return 0; /* 0 means RFU (reserved for future use) here */
}
/* dissect TA(ta_index) */
static void
dissect_iso7816_atr_ta(tvbuff_t *tvb, gint offset, guint ta_index,
packet_info *pinfo _U_, proto_tree *tree)
{
guint8 ta, FI, DI;
guint16 Fi;
guint8 Di;
proto_item *ta_it;
proto_tree *ta_tree;
ta = tvb_get_guint8(tvb, offset);
ta_it = proto_tree_add_uint_format(tree, hf_iso7816_atr_ta,
tvb, offset, 1, ta,
"Interface character TA(%d): 0x%02x", ta_index, ta);
ta_tree = proto_item_add_subtree(ta_it, ett_iso7816_atr_ta);
if (ta_index==1) {
FI = (tvb_get_guint8(tvb, offset) & 0xF0) >> 4;
Fi = FI_to_Fi(FI);
if (Fi>0) {
proto_tree_add_uint_format(ta_tree, hf_iso7816_atr_ta1_fi,
tvb, offset, 1, Fi,
"Clock rate conversion factor Fi: %d (FI 0x%x)",
Fi, FI);
}
DI = tvb_get_guint8(tvb, offset) & 0x0F;
Di = DI_to_Di(DI);
if (Di>0) {
proto_tree_add_uint_format(ta_tree, hf_iso7816_atr_ta1_di,
tvb, offset, 1, Di,
"Baud rate adjustment factor Di: %d (DI 0x%x)",
Di, DI);
}
}
}
static int
dissect_iso7816_atr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
gint offset=0;
guint8 init_char;
guint i=0; /* loop index for TA(i)...TD(i) */
proto_item *proto_it;
proto_tree *proto_tr;
guint8 tb, tc, td, k=0;
gint tck_len;
/* we need at least the initial char TS and the format char T0 */
if (tvb_captured_length(tvb) < 2)
return 0; /* no ATR sequence */
init_char = tvb_get_guint8(tvb, offset);
if (init_char!=0x3B && init_char!=0x3F)
return 0;
proto_it = proto_tree_add_protocol_format(tree, proto_iso7816_atr,
tvb, 0, -1, "ISO 7816 ATR");
proto_tr = proto_item_add_subtree(proto_it, ett_iso7816_atr);
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "ATR");
/* ISO 7816-4, section 4 indicates that concatenations are big endian */
proto_tree_add_item(proto_tr, hf_iso7816_atr_init_char,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
do {
proto_item *td_it;
proto_tree *td_tree;
/* for i==0, this is the T0 byte, otherwise it's the TD(i) byte
in each loop, we dissect T0/TD(i) and TA(i+1), TB(i+1), TC(i+1) */
td = tvb_get_guint8(tvb, offset);
if (i==0) {
td_it = proto_tree_add_item(proto_tr, hf_iso7816_atr_t0,
tvb, offset, 1, ENC_BIG_ENDIAN);
}
else {
td_it = proto_tree_add_uint_format(proto_tr, hf_iso7816_atr_td,
tvb, offset, 1, td,
"Interface character TD(%d): 0x%02x", i, td);
}
td_tree = proto_item_add_subtree(td_it, ett_iso7816_atr_td);
proto_tree_add_boolean_format(td_tree, hf_iso7816_atr_next_ta_present,
tvb, offset, 1, td&0x10,
"TA(%d) present: %s", i+1, td&0x10 ? "True" : "False");
proto_tree_add_boolean_format(td_tree, hf_iso7816_atr_next_tb_present,
tvb, offset, 1, td&0x20,
"TB(%d) present: %s", i+1, td&0x20 ? "True" : "False");
proto_tree_add_boolean_format(td_tree, hf_iso7816_atr_next_tc_present,
tvb, offset, 1, td&0x40,
"TC(%d) present: %s", i+1, td&0x40 ? "True" : "False");
proto_tree_add_boolean_format(td_tree, hf_iso7816_atr_next_td_present,
tvb, offset, 1, td&0x80,
"TD(%d) present: %s", i+1, td&0x80 ? "True" : "False");
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
"TA(%d)=%s TB(%d)=%s TC(%d)=%s TD(%d)=%s",
i+1, td&0x10 ? "True" : "False",
i+1, td&0x20 ? "True" : "False",
i+1, td&0x40 ? "True" : "False",
i+1, td&0x80 ? "True" : "False");
if (i==0) {
k = td&0x0F; /* number of historical bytes */
proto_tree_add_item(td_tree, hf_iso7816_atr_k,
tvb, offset, 1, ENC_BIG_ENDIAN);
}
else {
proto_tree_add_item(td_tree, hf_iso7816_atr_t,
tvb, offset, 1, ENC_BIG_ENDIAN);
}
offset++;
if (td&0x10) {
/* we read TA(i+1), see comment above */
dissect_iso7816_atr_ta(tvb, offset, i+1, pinfo, proto_tr);
offset++;
}
if (td&0x20) {
tb = tvb_get_guint8(tvb, offset);
proto_tree_add_uint_format(proto_tr, hf_iso7816_atr_tb,
tvb, offset, 1, tb,
"Interface character TB(%d): 0x%02x", i+1, tb);
offset++;
}
if (td&0x40) {
tc = tvb_get_guint8(tvb, offset);
proto_tree_add_uint_format(proto_tr, hf_iso7816_atr_tc,
tvb, offset, 1, tc,
"Interface character TC(%d): 0x%02x", i+1, tc);
offset++;
}
i++;
} while (td&0x80);
if (k>0) {
proto_tree_add_item(proto_tr, hf_iso7816_atr_hist_bytes,
tvb, offset, k, ENC_NA);
offset += k;
}
tck_len = tvb_reported_length_remaining(tvb, offset);
/* tck is either absent or exactly one byte */
if (tck_len==1) {
proto_tree_add_item(proto_tr, hf_iso7816_atr_tck,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
else if (tck_len>1) {
proto_tree_add_expert(proto_tr, pinfo, &ie_iso7816_atr_tck_not1,
tvb, offset, tck_len);
}
proto_item_set_len(proto_it, offset);
return offset;
}
/* Dissect the class byte. Return 1 if the APDU's structure and coding
adhere to ISO 7816. In this case, we can dissect the rest of the
APDU. Otherwise, return -1. We may then pass the APDU to other
dissectors. */
static gint
dissect_iso7816_class(tvbuff_t *tvb, gint offset,
packet_info *pinfo _U_, proto_tree *tree)
{
proto_item *class_item;
proto_tree *class_tree;
guint8 dev_class;
class_item = proto_tree_add_item(tree, hf_iso7816_cla,
tvb, offset, 1, ENC_BIG_ENDIAN);
class_tree = proto_item_add_subtree(class_item, ett_iso7816_class);
dev_class = tvb_get_guint8(tvb, offset);
if (dev_class>=0x10 && dev_class<=0x7F) {
/* these values are RFU. */
return -1;
}
if (dev_class>=0xD0 && dev_class<=0xFE) {
/* proprietary structure and coding */
return -1;
}
if (dev_class==0xFF) {
/* reserved for Protocol Type Selection */
return -1;
}
/* If we made it this far, the structrue of the APDU is compliant
with ISO 7816. */
proto_tree_add_item(class_tree, hf_iso7816_cla_sm,
tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(class_tree, hf_iso7816_cla_channel,
tvb, offset, 1, ENC_BIG_ENDIAN);
if (dev_class>=0x80 && dev_class<=0x9F) {
/* structure according to ISO 7816, coding is proprietary */
return -1;
}
if (dev_class>=0xB0 && dev_class<=0xCF) {
/* structure according to ISO 7816 */
return -1;
}
/* both structure and coding according to ISO 7816 */
return 1;
}
/* dissect the parameters p1 and p2
return number of dissected bytes or -1 for error */
static gint
dissect_iso7816_params(guint8 ins, tvbuff_t *tvb, gint offset,
packet_info *pinfo _U_, proto_tree *tree)
{
gint offset_start, p1_offset, p2_offset;
proto_tree *params_tree;
guint8 p1, p2;
proto_item *p1_it = NULL, *p2_it = NULL;
proto_tree *p1_tree = NULL, *p2_tree = NULL;
proto_item *p1_p2_it = NULL;
guint16 P1P2;
guint32 ef, read_rec_usage;
offset_start = offset;
params_tree = proto_tree_add_subtree(tree, tvb, offset_start, 2,
ett_iso7816_param, NULL, "Parameters");
p1 = tvb_get_guint8(tvb,offset);
p1_it = proto_tree_add_item(params_tree, hf_iso7816_p1, tvb,
offset, 1, ENC_BIG_ENDIAN);
p1_offset = offset;
offset++;
p2 = tvb_get_guint8(tvb,offset);
p2_it = proto_tree_add_item(params_tree, hf_iso7816_p2,
tvb, offset, 1, ENC_BIG_ENDIAN);
p2_offset = offset;
offset++;
P1P2 = (p1<<8|p2);
switch (ins) {
case INS_EXT_AUTH:
if (p1>0) {
proto_item_append_text(p1_it,
" (reference of the algorithm on the card)");
}
proto_item_append_text(p2_it, " (reference of the secret)");
break;
case INS_SELECT_FILE:
proto_item_append_text(p1_it, " (selection control)");
p1_tree = proto_item_add_subtree(p1_it, ett_iso7816_p1);
proto_tree_add_item(p1_tree, hf_iso7816_sel_file_ctrl,
tvb, p1_offset, 1, ENC_BIG_ENDIAN);
proto_item_append_text(p2_it, " (selection options)");
p2_tree = proto_item_add_subtree(p2_it, ett_iso7816_p2);
proto_tree_add_item(p2_tree, hf_iso7816_sel_file_fci_req,
tvb, p2_offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(p2_tree, hf_iso7816_sel_file_occ,
tvb, p2_offset, 1, ENC_BIG_ENDIAN);
break;
case INS_READ_BIN:
if (p1&0x80) {
/* XXX - b5-b1 of P1 == short ef identifier for the selected file */
/* XXX - P2 == offset for the read */
}
else {
p1_p2_it = proto_tree_add_uint(params_tree, hf_iso7816_offset_first_byte,
tvb, offset_start, offset-offset_start, P1P2);
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
"offset %d", P1P2);
}
break;
case INS_READ_REC:
proto_item_append_text(p1_it, " (record number)");
proto_item_append_text(p2_it, " (reference control)");
p2_tree = proto_item_add_subtree(p2_it, ett_iso7816_p2);
proto_tree_add_item_ret_uint(p2_tree, hf_iso7816_read_rec_ef,
tvb, p2_offset, 1, ENC_BIG_ENDIAN, &ef);
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL, "EF %d", ef);
proto_tree_add_item_ret_uint(p2_tree, hf_iso7816_read_rec_usage,
tvb, p2_offset, 1, ENC_BIG_ENDIAN, &read_rec_usage);
if (read_rec_usage == READ_REC_USAGE_SINGLE) {
col_append_sep_fstr(
pinfo->cinfo, COL_INFO, NULL, "record %d", p1);
}
break;
case INS_GET_RESP:
p1_p2_it = proto_tree_add_uint_format(params_tree, hf_iso7816_get_resp,
tvb, offset_start, offset-offset_start, P1P2,
"Both should be 0x00, other values are RFU");
break;
case INS_GET_DATA:
if (P1P2<=0x003F || (0x0300<=P1P2 && P1P2<=0x3FFF)) {
p1_p2_it = proto_tree_add_uint(params_tree, hf_iso7816_rfu,
tvb, offset_start, offset-offset_start, P1P2);
}
else if (0x0100<=P1P2 && P1P2<=0x01FF) {
p1_p2_it = proto_tree_add_uint(params_tree, hf_iso7816_application_data,
tvb, offset_start, offset-offset_start, P1P2);
}
break;
default:
break;
}
proto_item_set_generated(p1_p2_it);
return 2;
}
static gint
dissect_iso7816_le(
tvbuff_t *tvb, gint offset, packet_info *pinfo _U_, proto_tree *tree)
{
proto_tree_add_item(tree, hf_iso7816_le, tvb, offset, 1, ENC_BIG_ENDIAN);
return 1;
}
static gint
dissect_iso7816_cmd_apdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
iso7816_transaction_t *iso7816_trans = NULL;
proto_item *trans_ti = NULL;
gint ret;
gint offset = 0;
guint8 ins;
gint body_len;
guint8 lc;
if (PINFO_FD_VISITED(pinfo)) {
iso7816_trans = (iso7816_transaction_t *)wmem_tree_lookup32(
transactions, pinfo->num);
if (iso7816_trans && iso7816_trans->cmd_frame==pinfo->num &&
iso7816_trans->resp_frame!=0) {
trans_ti = proto_tree_add_uint_format(tree, hf_iso7816_resp_in,
NULL, 0, 0, iso7816_trans->resp_frame,
"Response in frame %d", iso7816_trans->resp_frame);
proto_item_set_generated(trans_ti);
}
}
else {
if (transactions) {
iso7816_trans = wmem_new(wmem_file_scope(), iso7816_transaction_t);
iso7816_trans->cmd_frame = pinfo->num;
iso7816_trans->resp_frame = 0;
iso7816_trans->cmd_ins = INS_INVALID;
iso7816_trans->handle = NULL;
wmem_tree_insert32(transactions,
iso7816_trans->cmd_frame, (void *)iso7816_trans);
}
}
ret = dissect_iso7816_class(tvb, offset, pinfo, tree);
if (ret==-1) {
/* the class byte says that the remaining APDU is not
in ISO7816 format */
iso7816_trans->handle =
dissector_get_payload_handle(iso7816_apdu_pld_table);
if (iso7816_trans->handle != NULL) {
ret = call_dissector(iso7816_trans->handle, tvb, pinfo, tree);
if (ret == 0) {
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL,
"Command APDU using proprietary format");
return 1; /* we only dissected the class byte */
}
}
return ret;
}
offset += ret;
ins = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_iso7816_ins, tvb, offset, 1, ENC_BIG_ENDIAN);
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL,
val_to_str_ext_const(ins, &iso7816_ins_ext, "Unknown instruction"));
offset++;
/* if we just created a new transaction, we can now fill in the cmd id */
if (iso7816_trans && iso7816_trans->cmd_ins==INS_INVALID)
iso7816_trans->cmd_ins = ins;
ret = dissect_iso7816_params(ins, tvb, offset, pinfo, tree);
if (ret>0)
offset += ret;
/* for now, we support only short length fields
based on infos from the ATR, we could support extended length fields too */
body_len = tvb_reported_length_remaining(tvb, offset);
/* nothing to do for body_len==0 */
if (body_len==1) {
offset += dissect_iso7816_le(tvb, offset, pinfo, tree);
}
else if (body_len>1) {
lc = tvb_get_guint8(tvb, offset);
proto_tree_add_item(
tree, hf_iso7816_lc, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
if (lc>0) {
proto_tree_add_item(tree, hf_iso7816_body, tvb, offset, lc, ENC_NA);
offset += lc;
}
if (tvb_reported_length_remaining(tvb, offset)>0) {
offset += dissect_iso7816_le(tvb, offset, pinfo, tree);
}
}
return offset;
}
static gint
dissect_iso7816_resp_apdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
iso7816_transaction_t *iso7816_trans;
proto_item *trans_ti = NULL;
const gchar *cmd_ins_str;
gint offset = 0;
gint body_len;
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Response APDU");
if (transactions) {
/* receive the largest key that is less than or equal to our frame
number */
iso7816_trans = (iso7816_transaction_t *)wmem_tree_lookup32_le(
transactions, pinfo->num);
if (iso7816_trans) {
if (iso7816_trans->resp_frame==0) {
/* there's a pending request, this packet is the response */
iso7816_trans->resp_frame = pinfo->num;
}
if (iso7816_trans->resp_frame== pinfo->num) {
/* we found the request that corresponds to our response */
cmd_ins_str = val_to_str_const(iso7816_trans->cmd_ins,
iso7816_ins, "Unknown instruction");
trans_ti = proto_tree_add_uint_format(tree, hf_iso7816_resp_to,
NULL, 0, 0, iso7816_trans->cmd_frame,
"Response to frame %d (%s)",
iso7816_trans->cmd_frame, cmd_ins_str);
proto_item_set_generated(trans_ti);
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ",
"(to %s)", cmd_ins_str);
}
if (iso7816_trans->handle != NULL)
call_dissector(iso7816_trans->handle, tvb, pinfo, tree);
}
}
/* - 2 bytes SW1, SW2 */
body_len = tvb_reported_length_remaining(tvb, offset) - 2;
if (body_len>0) {
proto_tree_add_item(tree, hf_iso7816_body,
tvb, offset, body_len, ENC_NA);
offset += body_len;
}
if (tvb_reported_length_remaining(tvb, offset) >= 2) {
proto_tree_add_item(tree, hf_iso7816_sw1,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(tree, hf_iso7816_sw2,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
}
return offset;
}
static int
dissect_iso7816(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
gint offset = 0;
proto_item *tree_ti;
proto_tree *iso7816_tree;
gboolean is_atr = FALSE;
if (pinfo->p2p_dir!=P2P_DIR_SENT && pinfo->p2p_dir!=P2P_DIR_RECV)
return 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISO 7816");
col_clear(pinfo->cinfo, COL_INFO);
tree_ti = proto_tree_add_protocol_format(tree, proto_iso7816,
tvb, 0, tvb_reported_length(tvb), "ISO 7816");
iso7816_tree = proto_item_add_subtree(tree_ti, ett_iso7816);
/* per our definition, sent/received is from the perspective of the interface
i.e sent is from interface to card, received is from card to interface */
if (pinfo->p2p_dir==P2P_DIR_SENT) {
set_address(&pinfo->src, AT_STRINGZ,
(int)strlen(ADDR_INTF)+1, ADDR_INTF);
set_address(&pinfo->dst, AT_STRINGZ,
(int)strlen(ADDR_CARD)+1, ADDR_CARD);
proto_item_append_text(tree_ti, " Command APDU");
offset = dissect_iso7816_cmd_apdu(tvb, pinfo, iso7816_tree);
}
else if (pinfo->p2p_dir==P2P_DIR_RECV) {
set_address(&pinfo->src, AT_STRINGZ,
(int)strlen(ADDR_CARD)+1, ADDR_CARD);
set_address(&pinfo->dst, AT_STRINGZ,
(int)strlen(ADDR_INTF)+1, ADDR_INTF);
if (iso7816_atr_handle) {
offset = call_dissector_only(iso7816_atr_handle,
tvb, pinfo, iso7816_tree, NULL);
if (offset > 0)
is_atr = TRUE;
}
if (!is_atr) {
proto_item_append_text(tree_ti, " Response APDU");
offset = dissect_iso7816_resp_apdu(tvb, pinfo, iso7816_tree);
}
}
return offset;
}
void
proto_register_iso7816(void)
{
static hf_register_info hf[] = {
{ &hf_iso7816_atr_init_char,
{ "Initial character", "iso7816.atr.init_char",
FT_UINT8, BASE_HEX, VALS(iso7816_atr_init_char), 0, NULL, HFILL }
},
{ &hf_iso7816_atr_t0,
{ "Format character T0", "iso7816.atr.t0",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_ta,
{ "Interface character TA(i)", "iso7816.atr.ta",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_ta1_fi,
{ "Fi", "iso7816.atr.ta1.fi",
FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_ta1_di,
{ "Di", "iso7816.atr.ta1.di",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_tb,
{ "Interface character TB(i)", "iso7816.atr.tb",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_tc,
{ "Interface character TC(i)", "iso7816.atr.tc",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_td,
{ "Interface character TD(i)", "iso7816.atr.td",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_next_ta_present,
{ "TA(i+1) present", "iso7816.atr.next_ta_present",
FT_BOOLEAN, 8, NULL, 0x10, NULL, HFILL }
},
{ &hf_iso7816_atr_next_tb_present,
{ "TB(i+1) present", "iso7816.atr.next_tb_present",
FT_BOOLEAN, 8, NULL, 0x20, NULL, HFILL }
},
{ &hf_iso7816_atr_next_tc_present,
{ "TC(i+1) present", "iso7816.atr.next_tc_present",
FT_BOOLEAN, 8, NULL, 0x40, NULL, HFILL }
},
{ &hf_iso7816_atr_next_td_present,
{ "TD(i+1) present", "iso7816.atr.next_td_present",
FT_BOOLEAN, 8, NULL, 0x80, NULL, HFILL }
},
{ &hf_iso7816_atr_k,
{ "Number K of historical bytes", "iso7816.atr.k",
FT_UINT8, BASE_DEC, NULL, 0x0F, NULL, HFILL }
},
{ &hf_iso7816_atr_t,
{ "Protocol reference T", "iso7816.atr.t",
FT_UINT8, BASE_HEX, NULL, 0x0F, NULL, HFILL }
},
{ &hf_iso7816_atr_hist_bytes,
{ "Historical bytes", "iso7816.atr.historical_bytes",
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_atr_tck,
{ "Check character TCK", "iso7816.atr.tck",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_resp_in,
{ "Response In", "iso7816.resp_in",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"The response to this command is in this frame", HFILL }
},
{ &hf_iso7816_resp_to,
{ "Response To", "iso7816.resp_to",
FT_FRAMENUM, BASE_NONE, NULL, 0x0,
"This is the response to the command in this frame", HFILL }
},
{ &hf_iso7816_cla,
{ "Class", "iso7816.apdu.cla",
FT_UINT8, BASE_HEX|BASE_RANGE_STRING, RVALS(iso7816_class_rvals), 0, NULL , HFILL }
},
{ &hf_iso7816_cla_sm,
{ "Secure Messaging", "iso7816.apdu.cla.sm",
FT_UINT8, BASE_HEX, VALS(iso7816_cla_sm), 0x0C, NULL , HFILL }
},
{ &hf_iso7816_cla_channel,
{ "Logical channel number", "iso7816.apdu.cla.channel",
FT_UINT8, BASE_HEX|BASE_SPECIAL_VALS, VALS(unique_or_unused), 0x03, NULL , HFILL }
},
{ &hf_iso7816_ins,
{ "Instruction", "iso7816.apdu.ins",
FT_UINT8, BASE_HEX | BASE_EXT_STRING, &iso7816_ins_ext, 0, NULL, HFILL }
},
{ &hf_iso7816_p1,
{ "Parameter 1", "iso7816.apdu.p1",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_p2,
{ "Parameter 2", "iso7816.apdu.p2",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_lc,
{ "Length field Lc", "iso7816.apdu.lc",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_le,
{ "Expected response length Le", "iso7816.apdu.le",
FT_UINT8, BASE_HEX|BASE_SPECIAL_VALS, VALS(unique_max_num_available_bytes), 0, NULL, HFILL }
},
{ &hf_iso7816_body,
{ "APDU Body", "iso7816.apdu.body",
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_sw1,
{ "Status Word SW1", "iso7816.apdu.sw1", FT_UINT8,
BASE_RANGE_STRING|BASE_HEX, RVALS(iso7816_sw1), 0, NULL, HFILL }
},
{ &hf_iso7816_sw2,
{ "Status Word SW2", "iso7816.apdu.sw2",
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_sel_file_ctrl,
{ "Selection control", "iso7816.apdu.select_file.ctrl",
FT_UINT8, BASE_HEX | BASE_EXT_STRING,
&ext_iso7816_sel_file_ctrl, 0, NULL, HFILL }
},
{ &hf_iso7816_sel_file_fci_req,
{ "File control information request", "iso7816.apdu.select_file.fci_req",
FT_UINT8, BASE_HEX | BASE_EXT_STRING,
&ext_iso7816_sel_file_fci_req, 0x0C, NULL, HFILL }
},
{ &hf_iso7816_sel_file_occ,
{ "Occurrence", "iso7816.apdu.select_file.occurrence",
FT_UINT8, BASE_HEX | BASE_EXT_STRING,
&ext_iso7816_sel_file_occ, 0x03, NULL, HFILL }
},
{ &hf_iso7816_read_rec_ef,
{ "Short EF identifier", "iso7816.apdu.read_rec.ef",
FT_UINT8, BASE_HEX, NULL, 0xF8, NULL, HFILL }
},
{ &hf_iso7816_read_rec_usage,
{ "Usage", "iso7816.apdu.read_rec.usage",
FT_UINT8, BASE_HEX | BASE_EXT_STRING,
&ext_iso7816_read_rec_usage, 0x07, NULL, HFILL }
},
{ &hf_iso7816_offset_first_byte,
{ "Offset of the first byte to read", "iso7816.offset_first_byte",
FT_UINT16, BASE_DEC, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_get_resp,
{ "GetResp", "iso7816.get_resp",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_rfu,
{ "RFU", "iso7816.rfu",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL }
},
{ &hf_iso7816_application_data,
{ "Application data (proprietary coding)", "iso7816.application_data",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL }
},
};
static gint *ett[] = {
&ett_iso7816,
&ett_iso7816_class,
&ett_iso7816_param,
&ett_iso7816_p1,
&ett_iso7816_p2,
&ett_iso7816_atr,
&ett_iso7816_atr_ta,
&ett_iso7816_atr_td
};
static ei_register_info ei[] = {
{ &ie_iso7816_atr_tck_not1, { "iso7816.atr.tck.not1", PI_PROTOCOL, PI_WARN, "TCK byte must either be absent or exactly one byte", EXPFILL }}
};
expert_module_t* expert_iso7816;
proto_iso7816 = proto_register_protocol(
"ISO/IEC 7816", "ISO 7816", "iso7816");
proto_register_field_array(proto_iso7816, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_iso7816 = expert_register_protocol(proto_iso7816);
expert_register_field_array(expert_iso7816, ei, array_length(ei));
iso7816_handle = register_dissector("iso7816", dissect_iso7816, proto_iso7816);
transactions = wmem_tree_new_autoreset(wmem_epan_scope(), wmem_file_scope());
proto_iso7816_atr = proto_register_protocol_in_name_only("ISO/IEC 7816-3", "ISO 7816-3", "iso7816.atr", proto_iso7816, FT_PROTOCOL);
iso7816_atr_handle = register_dissector("iso7816.atr", dissect_iso7816_atr, proto_iso7816_atr);
iso7816_apdu_pld_table =
register_decode_as_next_proto(proto_iso7816,
"iso7816.apdu_payload",
"ISO7816 proprietary APDU dissector", NULL);
}
void proto_reg_handoff_iso7816(void)
{
dissector_add_for_decode_as("usbccid.subdissector", iso7816_handle);
dissector_add_for_decode_as("iso14443.subdissector", iso7816_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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