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proxmark3/client/cmdhffido.c
merlokk 8201526f6e fix fido2 response structure
2018-11-17 01:40:27 +02:00

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//-----------------------------------------------------------------------------
// Copyright (C) 2018 Merlok
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// High frequency MIFARE Plus commands
//-----------------------------------------------------------------------------
//
// Documentation here:
//
// FIDO Alliance specifications
// https://fidoalliance.org/download/
// FIDO NFC Protocol Specification v1.0
// https://fidoalliance.org/specs/fido-u2f-v1.2-ps-20170411/fido-u2f-nfc-protocol-v1.2-ps-20170411.html
// FIDO U2F Raw Message Formats
// https://fidoalliance.org/specs/fido-u2f-v1.2-ps-20170411/fido-u2f-raw-message-formats-v1.2-ps-20170411.html
//-----------------------------------------------------------------------------
#include "cmdhffido.h"
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <jansson.h>
#include <mbedtls/x509_crt.h>
#include <mbedtls/x509.h>
#include <mbedtls/pk.h>
#include "comms.h"
#include "cmdmain.h"
#include "util.h"
#include "ui.h"
#include "proxmark3.h"
#include "cmdhf14a.h"
#include "mifare.h"
#include "emv/emvcore.h"
#include "emv/emvjson.h"
#include "emv/dump.h"
#include "cliparser/cliparser.h"
#include "crypto/asn1utils.h"
#include "crypto/libpcrypto.h"
#include "fido/additional_ca.h"
#include "fido/cbortools.h"
static int CmdHelp(const char *Cmd);
int FIDOSelect(bool ActivateField, bool LeaveFieldON, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
uint8_t data[] = {0xA0, 0x00, 0x00, 0x06, 0x47, 0x2F, 0x00, 0x01};
return EMVSelect(ActivateField, LeaveFieldON, data, sizeof(data), Result, MaxResultLen, ResultLen, sw, NULL);
}
int FIDOExchange(sAPDU apdu, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
int res = EMVExchange(true, apdu, Result, MaxResultLen, ResultLen, sw, NULL);
if (res == 5) // apdu result (sw) not a 0x9000
res = 0;
// software chaining
while (!res && (*sw >> 8) == 0x61) {
size_t oldlen = *ResultLen;
res = EMVExchange(true, (sAPDU){0x00, 0xC0, 0x00, 0x00, 0x00, NULL}, &Result[oldlen], MaxResultLen - oldlen, ResultLen, sw, NULL);
if (res == 5) // apdu result (sw) not a 0x9000
res = 0;
*ResultLen += oldlen;
if (*ResultLen > MaxResultLen)
return 100;
}
return res;
}
int FIDORegister(uint8_t *params, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
return FIDOExchange((sAPDU){0x00, 0x01, 0x03, 0x00, 64, params}, Result, MaxResultLen, ResultLen, sw);
}
int FIDOAuthentication(uint8_t *params, uint8_t paramslen, uint8_t controlb, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
return FIDOExchange((sAPDU){0x00, 0x02, controlb, 0x00, paramslen, params}, Result, MaxResultLen, ResultLen, sw);
}
int FIDO2GetInfo(uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
uint8_t data[] = {0x04};
return FIDOExchange((sAPDU){0x80, 0x10, 0x00, 0x00, sizeof(data), data}, Result, MaxResultLen, ResultLen, sw);
}
int CmdHFFidoInfo(const char *cmd) {
if (cmd && strlen(cmd) > 0)
PrintAndLog("WARNING: command don't have any parameters.\n");
// info about 14a part
CmdHF14AInfo("");
// FIDO info
PrintAndLog("--------------------------------------------");
SetAPDULogging(false);
uint8_t buf[APDU_RES_LEN] = {0};
size_t len = 0;
uint16_t sw = 0;
int res = FIDOSelect(true, true, buf, sizeof(buf), &len, &sw);
if (res) {
DropField();
return res;
}
if (sw != 0x9000) {
if (sw)
PrintAndLog("Not a FIDO card! APDU response: %04x - %s", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
else
PrintAndLog("APDU exchange error. Card returns 0x0000.");
DropField();
return 0;
}
if (!strncmp((char *)buf, "U2F_V2", 7)) {
if (!strncmp((char *)buf, "FIDO_2_0", 8)) {
PrintAndLog("FIDO2 authenricator detected. Version: %.*s", len, buf);
} else {
PrintAndLog("FIDO authenricator detected (not standard U2F).");
PrintAndLog("Non U2F authenticator version:");
dump_buffer((const unsigned char *)buf, len, NULL, 0);
}
} else {
PrintAndLog("FIDO U2F authenricator detected. Version: %.*s", len, buf);
}
res = FIDO2GetInfo(buf, sizeof(buf), &len, &sw);
DropField();
if (res) {
return res;
}
if (sw != 0x9000) {
PrintAndLog("FIDO2 version not exists (%04x - %s).", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
return 0;
}
if(buf[0]) {
PrintAndLog("FIDO2 ger version error: %d", buf[0]);
return 0;
}
PrintAndLog("FIDO2 version: (%d)", len);
dump_buffer((const unsigned char *)buf, len, NULL, 0);
TinyCborPrintFIDOPackage(&buf[1], len - 1);
return 0;
}
json_t *OpenJson(int paramnum, char *fname, void* argtable[], bool *err) {
json_t *root = NULL;
json_error_t error;
*err = false;
uint8_t jsonname[250] ={0};
char *cjsonname = (char *)jsonname;
int jsonnamelen = 0;
// CLIGetStrWithReturn(paramnum, jsonname, &jsonnamelen);
if (CLIParamStrToBuf(arg_get_str(paramnum), jsonname, sizeof(jsonname), &jsonnamelen)) {
CLIParserFree();
return NULL;
}
// current path + file name
if (!strstr(cjsonname, ".json"))
strcat(cjsonname, ".json");
if (jsonnamelen) {
strcpy(fname, get_my_executable_directory());
strcat(fname, cjsonname);
if (access(fname, F_OK) != -1) {
root = json_load_file(fname, 0, &error);
if (!root) {
PrintAndLog("ERROR: json error on line %d: %s", error.line, error.text);
*err = true;
return NULL;
}
if (!json_is_object(root)) {
PrintAndLog("ERROR: Invalid json format. root must be an object.");
json_decref(root);
*err = true;
return NULL;
}
} else {
root = json_object();
}
}
return root;
}
int CmdHFFidoRegister(const char *cmd) {
uint8_t data[64] = {0};
int chlen = 0;
uint8_t cdata[250] = {0};
int applen = 0;
uint8_t adata[250] = {0};
json_t *root = NULL;
CLIParserInit("hf fido reg",
"Initiate a U2F token registration. Needs two 32-byte hash number. \nchallenge parameter (32b) and application parameter (32b).",
"Usage:\n\thf fido reg -> execute command with 2 parameters, filled 0x00\n"
"\thf fido reg 000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f 000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f -> execute command with parameters"
"\thf fido reg -p s0 s1 -> execute command with plain parameters");
void* argtable[] = {
arg_param_begin,
arg_lit0("aA", "apdu", "show APDU reqests and responses"),
arg_litn("vV", "verbose", 0, 2, "show technical data. vv - show full certificates data"),
arg_lit0("pP", "plain", "send plain ASCII to challenge and application parameters instead of HEX"),
arg_lit0("tT", "tlv", "Show DER certificate contents in TLV representation"),
arg_str0("jJ", "json", "fido.json", "JSON input / output file name for parameters."),
arg_str0(NULL, NULL, "<HEX/ASCII challenge parameter (32b HEX/1..16 chars)>", NULL),
arg_str0(NULL, NULL, "<HEX/ASCII application parameter (32b HEX/1..16 chars)>", NULL),
arg_param_end
};
CLIExecWithReturn(cmd, argtable, true);
bool APDULogging = arg_get_lit(1);
bool verbose = arg_get_lit(2);
bool verbose2 = arg_get_lit(2) > 1;
bool paramsPlain = arg_get_lit(3);
bool showDERTLV = arg_get_lit(4);
char fname[250] = {0};
bool err;
root = OpenJson(5, fname, argtable, &err);
if(err)
return 1;
if (root) {
size_t jlen;
JsonLoadBufAsHex(root, "$.ChallengeParam", data, 32, &jlen);
JsonLoadBufAsHex(root, "$.ApplicationParam", &data[32], 32, &jlen);
}
if (paramsPlain) {
memset(cdata, 0x00, 32);
CLIGetStrWithReturn(6, cdata, &chlen);
if (chlen && chlen > 16) {
PrintAndLog("ERROR: challenge parameter length in ASCII mode must be less than 16 chars instead of: %d", chlen);
return 1;
}
} else {
CLIGetHexWithReturn(6, cdata, &chlen);
if (chlen && chlen != 32) {
PrintAndLog("ERROR: challenge parameter length must be 32 bytes only.");
return 1;
}
}
if (chlen)
memmove(data, cdata, 32);
if (paramsPlain) {
memset(adata, 0x00, 32);
CLIGetStrWithReturn(7, adata, &applen);
if (applen && applen > 16) {
PrintAndLog("ERROR: application parameter length in ASCII mode must be less than 16 chars instead of: %d", applen);
return 1;
}
} else {
CLIGetHexWithReturn(7, adata, &applen);
if (applen && applen != 32) {
PrintAndLog("ERROR: application parameter length must be 32 bytes only.");
return 1;
}
}
if (applen)
memmove(&data[32], adata, 32);
CLIParserFree();
SetAPDULogging(APDULogging);
// challenge parameter [32 bytes] - The challenge parameter is the SHA-256 hash of the Client Data, a stringified JSON data structure that the FIDO Client prepares
// application parameter [32 bytes] - The application parameter is the SHA-256 hash of the UTF-8 encoding of the application identity
uint8_t buf[2048] = {0};
size_t len = 0;
uint16_t sw = 0;
DropField();
int res = FIDOSelect(true, true, buf, sizeof(buf), &len, &sw);
if (res) {
PrintAndLog("Can't select authenticator. res=%x. Exit...", res);
DropField();
return res;
}
if (sw != 0x9000) {
PrintAndLog("Can't select FIDO application. APDU response status: %04x - %s", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
DropField();
return 2;
}
res = FIDORegister(data, buf, sizeof(buf), &len, &sw);
DropField();
if (res) {
PrintAndLog("Can't execute register command. res=%x. Exit...", res);
return res;
}
if (sw != 0x9000) {
PrintAndLog("ERROR execute register command. APDU response status: %04x - %s", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
return 3;
}
PrintAndLog("");
if (APDULogging)
PrintAndLog("---------------------------------------------------------------");
PrintAndLog("data len: %d", len);
if (verbose2) {
PrintAndLog("--------------data----------------------");
dump_buffer((const unsigned char *)buf, len, NULL, 0);
PrintAndLog("--------------data----------------------");
}
if (buf[0] != 0x05) {
PrintAndLog("ERROR: First byte must be 0x05, but it %2x", buf[0]);
return 5;
}
PrintAndLog("User public key: %s", sprint_hex(&buf[1], 65));
uint8_t keyHandleLen = buf[66];
PrintAndLog("Key handle[%d]: %s", keyHandleLen, sprint_hex(&buf[67], keyHandleLen));
int derp = 67 + keyHandleLen;
int derLen = (buf[derp + 2] << 8) + buf[derp + 3] + 4;
if (verbose2) {
PrintAndLog("DER certificate[%d]:\n------------------DER-------------------", derLen);
dump_buffer_simple((const unsigned char *)&buf[derp], derLen, NULL);
PrintAndLog("\n----------------DER---------------------");
} else {
if (verbose)
PrintAndLog("------------------DER-------------------");
PrintAndLog("DER certificate[%d]: %s...", derLen, sprint_hex(&buf[derp], 20));
}
// check and print DER certificate
uint8_t public_key[65] = {0};
// print DER certificate in TLV view
if (showDERTLV) {
PrintAndLog("----------------DER TLV-----------------");
asn1_print(&buf[derp], derLen, " ");
PrintAndLog("----------------DER TLV-----------------");
}
// load CA's
mbedtls_x509_crt cacert;
mbedtls_x509_crt_init(&cacert);
res = mbedtls_x509_crt_parse(&cacert, (const unsigned char *) additional_ca_pem, additional_ca_pem_len);
if (res < 0) {
PrintAndLog("ERROR: CA parse certificate returned -0x%x - %s", -res, ecdsa_get_error(res));
}
if (verbose)
PrintAndLog("CA load OK. %d skipped", res);
// load DER certificate from authenticator's data
mbedtls_x509_crt cert;
mbedtls_x509_crt_init(&cert);
res = mbedtls_x509_crt_parse_der(&cert, &buf[derp], derLen);
if (res) {
PrintAndLog("ERROR: DER parse returned 0x%x - %s", (res<0)?-res:res, ecdsa_get_error(res));
}
// get certificate info
char linfo[300] = {0};
if (verbose) {
mbedtls_x509_crt_info(linfo, sizeof(linfo), " ", &cert);
PrintAndLog("DER certificate info:\n%s", linfo);
}
// verify certificate
uint32_t verifyflags = 0;
res = mbedtls_x509_crt_verify(&cert, &cacert, NULL, NULL, &verifyflags, NULL, NULL);
if (res) {
PrintAndLog("ERROR: DER verify returned 0x%x - %s", (res<0)?-res:res, ecdsa_get_error(res));
} else {
PrintAndLog("Certificate OK.");
}
if (verbose) {
memset(linfo, 0x00, sizeof(linfo));
mbedtls_x509_crt_verify_info(linfo, sizeof(linfo), " ", verifyflags);
PrintAndLog("Verification info:\n%s", linfo);
}
// get public key
res = ecdsa_public_key_from_pk(&cert.pk, public_key, sizeof(public_key));
if (res) {
PrintAndLog("ERROR: getting public key from certificate 0x%x - %s", (res<0)?-res:res, ecdsa_get_error(res));
} else {
if (verbose)
PrintAndLog("Got a public key from certificate:\n%s", sprint_hex_inrow(public_key, 65));
}
if (verbose)
PrintAndLog("------------------DER-------------------");
mbedtls_x509_crt_free(&cert);
mbedtls_x509_crt_free(&cacert);
// get hash
int hashp = 1 + 65 + 1 + keyHandleLen + derLen;
PrintAndLog("Hash[%d]: %s", len - hashp, sprint_hex(&buf[hashp], len - hashp));
// check ANSI X9.62 format ECDSA signature (on P-256)
uint8_t rval[300] = {0};
uint8_t sval[300] = {0};
res = ecdsa_asn1_get_signature(&buf[hashp], len - hashp, rval, sval);
if (!res) {
if (verbose) {
PrintAndLog(" r: %s", sprint_hex(rval, 32));
PrintAndLog(" s: %s", sprint_hex(sval, 32));
}
uint8_t xbuf[4096] = {0};
size_t xbuflen = 0;
res = FillBuffer(xbuf, sizeof(xbuf), &xbuflen,
"\x00", 1,
&data[32], 32, // application parameter
&data[0], 32, // challenge parameter
&buf[67], keyHandleLen, // keyHandle
&buf[1], 65, // user public key
NULL, 0);
//PrintAndLog("--xbuf(%d)[%d]: %s", res, xbuflen, sprint_hex(xbuf, xbuflen));
res = ecdsa_signature_verify(public_key, xbuf, xbuflen, &buf[hashp], len - hashp);
if (res) {
if (res == -0x4e00) {
PrintAndLog("Signature is NOT VALID.");
} else {
PrintAndLog("Other signature check error: %x %s", (res<0)?-res:res, ecdsa_get_error(res));
}
} else {
PrintAndLog("Signature is OK.");
}
} else {
PrintAndLog("Invalid signature. res=%d.", res);
}
PrintAndLog("\nauth command: ");
printf("hf fido auth %s%s", paramsPlain?"-p ":"", sprint_hex_inrow(&buf[67], keyHandleLen));
if(chlen || applen)
printf(" %s", paramsPlain?(char *)cdata:sprint_hex_inrow(cdata, 32));
if(applen)
printf(" %s", paramsPlain?(char *)adata:sprint_hex_inrow(adata, 32));
printf("\n");
if (root) {
JsonSaveBufAsHex(root, "ChallengeParam", data, 32);
JsonSaveBufAsHex(root, "ApplicationParam", &data[32], 32);
JsonSaveBufAsHexCompact(root, "PublicKey", &buf[1], 65);
JsonSaveInt(root, "KeyHandleLen", keyHandleLen);
JsonSaveBufAsHexCompact(root, "KeyHandle", &buf[67], keyHandleLen);
JsonSaveBufAsHexCompact(root, "DER", &buf[67 + keyHandleLen], derLen);
res = json_dump_file(root, fname, JSON_INDENT(2));
if (res) {
PrintAndLog("ERROR: can't save the file: %s", fname);
return 200;
}
PrintAndLog("File `%s` saved.", fname);
// free json object
json_decref(root);
}
return 0;
};
int CmdHFFidoAuthenticate(const char *cmd) {
uint8_t data[512] = {0};
uint8_t hdata[250] = {0};
bool public_key_loaded = false;
uint8_t public_key[65] = {0};
int hdatalen = 0;
uint8_t keyHandleLen = 0;
json_t *root = NULL;
CLIParserInit("hf fido auth",
"Initiate a U2F token authentication. Needs key handle and two 32-byte hash number. \nkey handle(var 0..255), challenge parameter (32b) and application parameter (32b).",
"Usage:\n\thf fido auth 000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f -> execute command with 2 parameters, filled 0x00 and key handle\n"
"\thf fido auth 000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f "
"000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f 000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f -> execute command with parameters");
void* argtable[] = {
arg_param_begin,
arg_lit0("aA", "apdu", "show APDU reqests and responses"),
arg_lit0("vV", "verbose", "show technical data"),
arg_lit0("pP", "plain", "send plain ASCII to challenge and application parameters instead of HEX"),
arg_rem("default mode:", "dont-enforce-user-presence-and-sign"),
arg_lit0("uU", "user", "mode: enforce-user-presence-and-sign"),
arg_lit0("cC", "check", "mode: check-only"),
arg_str0("jJ", "json", "fido.json", "JSON input / output file name for parameters."),
arg_str0("kK", "key", "public key to verify signature", NULL),
arg_str0(NULL, NULL, "<HEX key handle (var 0..255b)>", NULL),
arg_str0(NULL, NULL, "<HEX/ASCII challenge parameter (32b HEX/1..16 chars)>", NULL),
arg_str0(NULL, NULL, "<HEX/ASCII application parameter (32b HEX/1..16 chars)>", NULL),
arg_param_end
};
CLIExecWithReturn(cmd, argtable, true);
bool APDULogging = arg_get_lit(1);
bool verbose = arg_get_lit(2);
bool paramsPlain = arg_get_lit(3);
uint8_t controlByte = 0x08;
if (arg_get_lit(5))
controlByte = 0x03;
if (arg_get_lit(6))
controlByte = 0x07;
char fname[250] = {0};
bool err;
root = OpenJson(7, fname, argtable, &err);
if(err)
return 1;
if (root) {
size_t jlen;
JsonLoadBufAsHex(root, "$.ChallengeParam", data, 32, &jlen);
JsonLoadBufAsHex(root, "$.ApplicationParam", &data[32], 32, &jlen);
JsonLoadBufAsHex(root, "$.KeyHandle", &data[65], 512 - 67, &jlen);
keyHandleLen = jlen & 0xff;
data[64] = keyHandleLen;
JsonLoadBufAsHex(root, "$.PublicKey", public_key, 65, &jlen);
public_key_loaded = (jlen > 0);
}
// public key
CLIGetHexWithReturn(8, hdata, &hdatalen);
if (hdatalen && hdatalen != 130) {
PrintAndLog("ERROR: public key length must be 65 bytes only.");
return 1;
}
if (hdatalen) {
memmove(public_key, hdata, hdatalen);
public_key_loaded = true;
}
CLIGetHexWithReturn(9, hdata, &hdatalen);
if (hdatalen > 255) {
PrintAndLog("ERROR: application parameter length must be less than 255.");
return 1;
}
if (hdatalen) {
keyHandleLen = hdatalen;
data[64] = keyHandleLen;
memmove(&data[65], hdata, keyHandleLen);
}
if (paramsPlain) {
memset(hdata, 0x00, 32);
CLIGetStrWithReturn(9, hdata, &hdatalen);
if (hdatalen && hdatalen > 16) {
PrintAndLog("ERROR: challenge parameter length in ASCII mode must be less than 16 chars instead of: %d", hdatalen);
return 1;
}
} else {
CLIGetHexWithReturn(10, hdata, &hdatalen);
if (hdatalen && hdatalen != 32) {
PrintAndLog("ERROR: challenge parameter length must be 32 bytes only.");
return 1;
}
}
if (hdatalen)
memmove(data, hdata, 32);
if (paramsPlain) {
memset(hdata, 0x00, 32);
CLIGetStrWithReturn(11, hdata, &hdatalen);
if (hdatalen && hdatalen > 16) {
PrintAndLog("ERROR: application parameter length in ASCII mode must be less than 16 chars instead of: %d", hdatalen);
return 1;
}
} else {
CLIGetHexWithReturn(10, hdata, &hdatalen);
if (hdatalen && hdatalen != 32) {
PrintAndLog("ERROR: application parameter length must be 32 bytes only.");
return 1;
}
}
if (hdatalen)
memmove(&data[32], hdata, 32);
CLIParserFree();
SetAPDULogging(APDULogging);
// (in parameter) conrtol byte 0x07 - check only, 0x03 - user presense + cign. 0x08 - sign only
// challenge parameter [32 bytes]
// application parameter [32 bytes]
// key handle length [1b] = N
// key handle [N]
uint8_t datalen = 32 + 32 + 1 + keyHandleLen;
uint8_t buf[2048] = {0};
size_t len = 0;
uint16_t sw = 0;
DropField();
int res = FIDOSelect(true, true, buf, sizeof(buf), &len, &sw);
if (res) {
PrintAndLog("Can't select authenticator. res=%x. Exit...", res);
DropField();
return res;
}
if (sw != 0x9000) {
PrintAndLog("Can't select FIDO application. APDU response status: %04x - %s", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
DropField();
return 2;
}
res = FIDOAuthentication(data, datalen, controlByte, buf, sizeof(buf), &len, &sw);
DropField();
if (res) {
PrintAndLog("Can't execute authentication command. res=%x. Exit...", res);
return res;
}
if (sw != 0x9000) {
PrintAndLog("ERROR execute authentication command. APDU response status: %04x - %s", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
return 3;
}
PrintAndLog("---------------------------------------------------------------");
PrintAndLog("User presence: %s", (buf[0]?"verified":"not verified"));
uint32_t cntr = (uint32_t)bytes_to_num(&buf[1], 4);
PrintAndLog("Counter: %d", cntr);
PrintAndLog("Hash[%d]: %s", len - 5, sprint_hex(&buf[5], len - 5));
// check ANSI X9.62 format ECDSA signature (on P-256)
uint8_t rval[300] = {0};
uint8_t sval[300] = {0};
res = ecdsa_asn1_get_signature(&buf[5], len - 5, rval, sval);
if (!res) {
if (verbose) {
PrintAndLog(" r: %s", sprint_hex(rval, 32));
PrintAndLog(" s: %s", sprint_hex(sval, 32));
}
if (public_key_loaded) {
uint8_t xbuf[4096] = {0};
size_t xbuflen = 0;
res = FillBuffer(xbuf, sizeof(xbuf), &xbuflen,
&data[32], 32, // application parameter
&buf[0], 1, // user presence
&buf[1], 4, // counter
data, 32, // challenge parameter
NULL, 0);
//PrintAndLog("--xbuf(%d)[%d]: %s", res, xbuflen, sprint_hex(xbuf, xbuflen));
res = ecdsa_signature_verify(public_key, xbuf, xbuflen, &buf[5], len - 5);
if (res) {
if (res == -0x4e00) {
PrintAndLog("Signature is NOT VALID.");
} else {
PrintAndLog("Other signature check error: %x %s", (res<0)?-res:res, ecdsa_get_error(res));
}
} else {
PrintAndLog("Signature is OK.");
}
} else {
PrintAndLog("No public key provided. can't check signature.");
}
} else {
PrintAndLog("Invalid signature. res=%d.", res);
}
if (root) {
JsonSaveBufAsHex(root, "ChallengeParam", data, 32);
JsonSaveBufAsHex(root, "ApplicationParam", &data[32], 32);
JsonSaveInt(root, "KeyHandleLen", keyHandleLen);
JsonSaveBufAsHexCompact(root, "KeyHandle", &data[65], keyHandleLen);
JsonSaveInt(root, "Counter", cntr);
res = json_dump_file(root, fname, JSON_INDENT(2));
if (res) {
PrintAndLog("ERROR: can't save the file: %s", fname);
return 200;
}
PrintAndLog("File `%s` saved.", fname);
// free json object
json_decref(root);
}
return 0;
};
static command_t CommandTable[] =
{
{"help", CmdHelp, 1, "This help."},
{"info", CmdHFFidoInfo, 0, "Info about FIDO tag."},
{"reg", CmdHFFidoRegister, 0, "FIDO U2F Registration Message."},
{"auth", CmdHFFidoAuthenticate, 0, "FIDO U2F Authentication Message."},
{NULL, NULL, 0, NULL}
};
int CmdHFFido(const char *Cmd) {
(void)WaitForResponseTimeout(CMD_ACK,NULL,100);
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd) {
CmdsHelp(CommandTable);
return 0;
}
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