//-----------------------------------------------------------------------------
// 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.
//-----------------------------------------------------------------------------
// FIDO2 authenticators core data and commands
// https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-client-to-authenticator-protocol-v2.0-id-20180227.html
//-----------------------------------------------------------------------------
//
#include "fidocore.h"
#include "commonutil.h" // ARRAYLEN
#include "emv/emvcore.h"
#include "emv/emvjson.h"
#include "cbortools.h"
#include "mbedtls/x509_crt.h"
#include "crypto/asn1utils.h"
#include "crypto/libpcrypto.h"
#include "additional_ca.h"
#include "cose.h"
#include "emv/dump.h"
#include "ui.h"
#include "util.h"
typedef struct {
uint8_t ErrorCode;
const char *ShortDescription;
const char *Description;
} fido2Error_t;
fido2Error_t fido2Errors[] = {
{0xFF, "n/a", "n/a"},
{0x00, "CTAP1_ERR_SUCCESS", "Indicates successful response."},
{0x01, "CTAP1_ERR_INVALID_COMMAND", "The command is not a valid CTAP command."},
{0x02, "CTAP1_ERR_INVALID_PARAMETER", "The command included an invalid parameter."},
{0x03, "CTAP1_ERR_INVALID_LENGTH", "Invalid message or item length."},
{0x04, "CTAP1_ERR_INVALID_SEQ", "Invalid message sequencing."},
{0x05, "CTAP1_ERR_TIMEOUT", "Message timed out."},
{0x06, "CTAP1_ERR_CHANNEL_BUSY", "Channel busy."},
{0x0A, "CTAP1_ERR_LOCK_REQUIRED", "Command requires channel lock."},
{0x0B, "CTAP1_ERR_INVALID_CHANNEL", "Command not allowed on this cid."},
{0x10, "CTAP2_ERR_CBOR_PARSING", "Error while parsing CBOR."},
{0x11, "CTAP2_ERR_CBOR_UNEXPECTED_TYPE", "Invalid/unexpected CBOR error."},
{0x12, "CTAP2_ERR_INVALID_CBOR", "Error when parsing CBOR."},
{0x13, "CTAP2_ERR_INVALID_CBOR_TYPE", "Invalid or unexpected CBOR type."},
{0x14, "CTAP2_ERR_MISSING_PARAMETER", "Missing non-optional parameter."},
{0x15, "CTAP2_ERR_LIMIT_EXCEEDED", "Limit for number of items exceeded."},
{0x16, "CTAP2_ERR_UNSUPPORTED_EXTENSION", "Unsupported extension."},
{0x17, "CTAP2_ERR_TOO_MANY_ELEMENTS", "Limit for number of items exceeded."},
{0x18, "CTAP2_ERR_EXTENSION_NOT_SUPPORTED", "Unsupported extension."},
{0x19, "CTAP2_ERR_CREDENTIAL_EXCLUDED", "Valid credential found in the exludeList."},
{0x20, "CTAP2_ERR_CREDENTIAL_NOT_VALID", "Credential not valid for authenticator."},
{0x21, "CTAP2_ERR_PROCESSING", "Processing (Lengthy operation is in progress)."},
{0x22, "CTAP2_ERR_INVALID_CREDENTIAL", "Credential not valid for the authenticator."},
{0x23, "CTAP2_ERR_USER_ACTION_PENDING", "Authentication is waiting for user interaction."},
{0x24, "CTAP2_ERR_OPERATION_PENDING", "Processing, lengthy operation is in progress."},
{0x25, "CTAP2_ERR_NO_OPERATIONS", "No request is pending."},
{0x26, "CTAP2_ERR_UNSUPPORTED_ALGORITHM", "Authenticator does not support requested algorithm."},
{0x27, "CTAP2_ERR_OPERATION_DENIED", "Not authorized for requested operation."},
{0x28, "CTAP2_ERR_KEY_STORE_FULL", "Internal key storage is full."},
{0x29, "CTAP2_ERR_NOT_BUSY", "Authenticator cannot cancel as it is not busy."},
{0x2A, "CTAP2_ERR_NO_OPERATION_PENDING", "No outstanding operations."},
{0x2B, "CTAP2_ERR_UNSUPPORTED_OPTION", "Unsupported option."},
{0x2C, "CTAP2_ERR_INVALID_OPTION", "Unsupported option."},
{0x2D, "CTAP2_ERR_KEEPALIVE_CANCEL", "Pending keep alive was cancelled."},
{0x2E, "CTAP2_ERR_NO_CREDENTIALS", "No valid credentials provided."},
{0x2F, "CTAP2_ERR_USER_ACTION_TIMEOUT", "Timeout waiting for user interaction."},
{0x30, "CTAP2_ERR_NOT_ALLOWED", "Continuation command, such as, authenticatorGetNextAssertion not allowed."},
{0x31, "CTAP2_ERR_PIN_INVALID", "PIN Blocked."},
{0x32, "CTAP2_ERR_PIN_BLOCKED", "PIN Blocked."},
{0x33, "CTAP2_ERR_PIN_AUTH_INVALID", "PIN authentication,pinAuth, verification failed."},
{0x34, "CTAP2_ERR_PIN_AUTH_BLOCKED", "PIN authentication,pinAuth, blocked. Requires power recycle to reset."},
{0x35, "CTAP2_ERR_PIN_NOT_SET", "No PIN has been set."},
{0x36, "CTAP2_ERR_PIN_REQUIRED", "PIN is required for the selected operation."},
{0x37, "CTAP2_ERR_PIN_POLICY_VIOLATION", "PIN policy violation. Currently only enforces minimum length."},
{0x38, "CTAP2_ERR_PIN_TOKEN_EXPIRED", "pinToken expired on authenticator."},
{0x39, "CTAP2_ERR_REQUEST_TOO_LARGE", "Authenticator cannot handle this request due to memory constraints."},
{0x7F, "CTAP1_ERR_OTHER", "Other unspecified error."},
{0xDF, "CTAP2_ERR_SPEC_LAST", "CTAP 2 spec last error."},
};
typedef struct {
fido2Commands Command;
fido2PacketType PckType;
int MemberNumber;
const char *Description;
} fido2Desc_t;
fido2Desc_t fido2CmdGetInfoRespDesc[] = {
{fido2CmdMakeCredential, ptResponse, 0x01, "fmt"},
{fido2CmdMakeCredential, ptResponse, 0x02, "authData"},
{fido2CmdMakeCredential, ptResponse, 0x03, "attStmt"},
{fido2CmdMakeCredential, ptQuery, 0x01, "clientDataHash"},
{fido2CmdMakeCredential, ptQuery, 0x02, "rp"},
{fido2CmdMakeCredential, ptQuery, 0x03, "user"},
{fido2CmdMakeCredential, ptQuery, 0x04, "pubKeyCredParams"},
{fido2CmdMakeCredential, ptQuery, 0x05, "excludeList"},
{fido2CmdMakeCredential, ptQuery, 0x06, "extensions"},
{fido2CmdMakeCredential, ptQuery, 0x07, "options"},
{fido2CmdMakeCredential, ptQuery, 0x08, "pinAuth"},
{fido2CmdMakeCredential, ptQuery, 0x09, "pinProtocol"},
{fido2CmdGetAssertion, ptResponse, 0x01, "credential"},
{fido2CmdGetAssertion, ptResponse, 0x02, "authData"},
{fido2CmdGetAssertion, ptResponse, 0x03, "signature"},
{fido2CmdGetAssertion, ptResponse, 0x04, "publicKeyCredentialUserEntity"},
{fido2CmdGetAssertion, ptResponse, 0x05, "numberOfCredentials"},
{fido2CmdGetAssertion, ptQuery, 0x01, "rpId"},
{fido2CmdGetAssertion, ptQuery, 0x02, "clientDataHash"},
{fido2CmdGetAssertion, ptQuery, 0x03, "allowList"},
{fido2CmdGetAssertion, ptQuery, 0x04, "extensions"},
{fido2CmdGetAssertion, ptQuery, 0x05, "options"},
{fido2CmdGetAssertion, ptQuery, 0x06, "pinAuth"},
{fido2CmdGetAssertion, ptQuery, 0x07, "pinProtocol"},
{fido2CmdGetNextAssertion, ptResponse, 0x01, "credential"},
{fido2CmdGetNextAssertion, ptResponse, 0x02, "authData"},
{fido2CmdGetNextAssertion, ptResponse, 0x03, "signature"},
{fido2CmdGetNextAssertion, ptResponse, 0x04, "publicKeyCredentialUserEntity"},
{fido2CmdGetInfo, ptResponse, 0x01, "versions"},
{fido2CmdGetInfo, ptResponse, 0x02, "extensions"},
{fido2CmdGetInfo, ptResponse, 0x03, "aaguid"},
{fido2CmdGetInfo, ptResponse, 0x04, "options"},
{fido2CmdGetInfo, ptResponse, 0x05, "maxMsgSize"},
{fido2CmdGetInfo, ptResponse, 0x06, "pinProtocols"},
{fido2CmdClientPIN, ptResponse, 0x01, "keyAgreement"},
{fido2CmdClientPIN, ptResponse, 0x02, "pinToken"},
{fido2CmdClientPIN, ptResponse, 0x03, "retries"},
{fido2CmdClientPIN, ptQuery, 0x01, "pinProtocol"},
{fido2CmdClientPIN, ptQuery, 0x02, "subCommand"},
{fido2CmdClientPIN, ptQuery, 0x03, "keyAgreement"},
{fido2CmdClientPIN, ptQuery, 0x04, "pinAuth"},
{fido2CmdClientPIN, ptQuery, 0x05, "newPinEnc"},
{fido2CmdClientPIN, ptQuery, 0x06, "pinHashEnc"},
{fido2CmdClientPIN, ptQuery, 0x07, "getKeyAgreement"},
{fido2CmdClientPIN, ptQuery, 0x08, "getRetries"},
{fido2COSEKey, ptResponse, 0x01, "kty"},
{fido2COSEKey, ptResponse, 0x03, "alg"},
{fido2COSEKey, ptResponse, -1, "crv"},
{fido2COSEKey, ptResponse, -2, "x - coordinate"},
{fido2COSEKey, ptResponse, -3, "y - coordinate"},
{fido2COSEKey, ptResponse, -4, "d - private key"},
};
const char *fido2GetCmdErrorDescription(uint8_t errorCode) {
for (size_t i = 0; i < ARRAYLEN(fido2Errors); i++)
if (fido2Errors[i].ErrorCode == errorCode)
return fido2Errors[i].Description;
return fido2Errors[0].Description;
}
const char *fido2GetCmdMemberDescription(uint8_t cmdCode, bool isResponse, int memberNum) {
for (size_t i = 0; i < ARRAYLEN(fido2CmdGetInfoRespDesc); i++)
if (fido2CmdGetInfoRespDesc[i].Command == cmdCode &&
fido2CmdGetInfoRespDesc[i].PckType == (isResponse ? ptResponse : ptQuery) &&
fido2CmdGetInfoRespDesc[i].MemberNumber == memberNum)
return fido2CmdGetInfoRespDesc[i].Description;
return NULL;
}
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(ECC_CONTACTLESS, 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(ECC_CONTACTLESS, 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(ECC_CONTACTLESS, 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[] = {fido2CmdGetInfo};
return FIDOExchange((sAPDU) {0x80, 0x10, 0x00, 0x00, sizeof(data), data}, Result, MaxResultLen, ResultLen, sw);
}
int FIDO2MakeCredential(uint8_t *params, uint8_t paramslen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
uint8_t data[paramslen + 1];
data[0] = fido2CmdMakeCredential;
memcpy(&data[1], params, paramslen);
return FIDOExchange((sAPDU) {0x80, 0x10, 0x00, 0x00, sizeof(data), data}, Result, MaxResultLen, ResultLen, sw);
}
int FIDO2GetAssertion(uint8_t *params, uint8_t paramslen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
uint8_t data[paramslen + 1];
data[0] = fido2CmdGetAssertion;
memcpy(&data[1], params, paramslen);
return FIDOExchange((sAPDU) {0x80, 0x10, 0x00, 0x00, sizeof(data), data}, Result, MaxResultLen, ResultLen, sw);
}
int FIDOCheckDERAndGetKey(uint8_t *der, size_t derLen, bool verbose, uint8_t *publicKey, size_t publicKeyMaxLen) {
int res;
// 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) {
PrintAndLogEx(ERR, "ERROR: CA parse certificate returned -0x%x - %s", -res, ecdsa_get_error(res));
}
if (verbose)
PrintAndLogEx(SUCCESS, "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, der, derLen);
if (res) {
PrintAndLogEx(ERR, "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);
PrintAndLogEx(SUCCESS, "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) {
PrintAndLogEx(ERR, "ERROR: DER verify returned 0x%x - %s\n", (res < 0) ? -res : res, ecdsa_get_error(res));
} else {
PrintAndLogEx(SUCCESS, "Certificate OK.\n");
}
if (verbose) {
memset(linfo, 0x00, sizeof(linfo));
mbedtls_x509_crt_verify_info(linfo, sizeof(linfo), " ", verifyflags);
PrintAndLogEx(SUCCESS, "Verification info:\n%s", linfo);
}
// get public key
res = ecdsa_public_key_from_pk(&cert.pk, MBEDTLS_ECP_DP_SECP256R1, publicKey, publicKeyMaxLen);
if (res) {
PrintAndLogEx(ERR, "ERROR: getting public key from certificate 0x%x - %s", (res < 0) ? -res : res, ecdsa_get_error(res));
} else {
if (verbose)
PrintAndLogEx(SUCCESS, "Got a public key from certificate:\n%s", sprint_hex_inrow(publicKey, 65));
}
if (verbose)
PrintAndLogEx(NORMAL, "------------------DER-------------------");
mbedtls_x509_crt_free(&cert);
mbedtls_x509_crt_free(&cacert);
return 0;
}
#define fido_check_if(r) if ((r) != CborNoError) {return r;} else
#define fido_check(r) if ((r) != CborNoError) return r;
int FIDO2CreateMakeCredentionalReq(json_t *root, uint8_t *data, size_t maxdatalen, size_t *datalen) {
if (datalen)
*datalen = 0;
if (!root || !data || !maxdatalen)
return 1;
int res;
CborEncoder encoder;
CborEncoder map;
cbor_encoder_init(&encoder, data, maxdatalen, 0);
// create main map
res = cbor_encoder_create_map(&encoder, &map, 5);
fido_check_if(res) {
// clientDataHash
res = cbor_encode_uint(&map, 1);
fido_check_if(res) {
res = CBOREncodeClientDataHash(root, &map);
fido_check(res);
}
// rp
res = cbor_encode_uint(&map, 2);
fido_check_if(res) {
res = CBOREncodeElm(root, "RelyingPartyEntity", &map);
fido_check(res);
}
// user
res = cbor_encode_uint(&map, 3);
fido_check_if(res) {
res = CBOREncodeElm(root, "UserEntity", &map);
fido_check(res);
}
// pubKeyCredParams
res = cbor_encode_uint(&map, 4);
fido_check_if(res) {
res = CBOREncodeElm(root, "pubKeyCredParams", &map);
fido_check(res);
}
// options
res = cbor_encode_uint(&map, 7);
fido_check_if(res) {
res = CBOREncodeElm(root, "MakeCredentialOptions", &map);
fido_check(res);
}
}
res = cbor_encoder_close_container(&encoder, &map);
fido_check(res);
size_t len = cbor_encoder_get_buffer_size(&encoder, data);
if (datalen)
*datalen = len;
return 0;
}
bool CheckrpIdHash(json_t *json, uint8_t *hash) {
char hashval[300] = {0};
uint8_t hash2[32] = {0};
JsonLoadStr(json, "$.RelyingPartyEntity.id", hashval);
int res = sha256hash((uint8_t *)hashval, strlen(hashval), hash2);
if (res)
return false;
return !memcmp(hash, hash2, 32);
}
// check ANSI X9.62 format ECDSA signature (on P-256)
static int FIDO2CheckSignature(json_t *root, uint8_t *publickey, uint8_t *sign, size_t signLen, uint8_t *authData, size_t authDataLen, bool verbose) {
int res;
uint8_t rval[300] = {0};
uint8_t sval[300] = {0};
res = ecdsa_asn1_get_signature(sign, signLen, rval, sval);
if (!res) {
if (verbose) {
PrintAndLogEx(NORMAL, " r: %s", sprint_hex(rval, 32));
PrintAndLogEx(NORMAL, " s: %s", sprint_hex(sval, 32));
}
uint8_t clientDataHash[32] = {0};
size_t clientDataHashLen = 0;
res = JsonLoadBufAsHex(root, "$.ClientDataHash", clientDataHash, sizeof(clientDataHash), &clientDataHashLen);
if (res || clientDataHashLen != 32) {
PrintAndLogEx(ERR, "ERROR: Can't get clientDataHash from json!");
return 2;
}
uint8_t xbuf[4096] = {0};
size_t xbuflen = 0;
res = FillBuffer(xbuf, sizeof(xbuf), &xbuflen,
authData, authDataLen, // rpIdHash[32] + flags[1] + signCount[4]
clientDataHash, 32, // Hash of the serialized client data. "$.ClientDataHash" from json
NULL, 0);
//PrintAndLogEx(NORMAL, "--xbuf(%d)[%d]: %s", res, xbuflen, sprint_hex(xbuf, xbuflen));
res = ecdsa_signature_verify(MBEDTLS_ECP_DP_SECP256R1, publickey, xbuf, xbuflen, sign, signLen, true);
if (res) {
if (res == MBEDTLS_ERR_ECP_VERIFY_FAILED) {
PrintAndLogEx(WARNING, "Signature is " _RED_("NOT VALID"));
} else {
PrintAndLogEx(WARNING, "Other signature check error: %x %s", (res < 0) ? -res : res, ecdsa_get_error(res));
}
return res;
} else {
PrintAndLogEx(SUCCESS, "Signature is OK.");
}
} else {
PrintAndLogEx(ERR, "Invalid signature. res = %d.", res);
return res;
}
return 0;
}
int FIDO2MakeCredentionalParseRes(json_t *root, uint8_t *data, size_t dataLen, bool verbose, bool verbose2, bool showCBOR, bool showDERTLV) {
CborParser parser;
CborValue map, mapsmt;
int res;
char *buf;
uint8_t *ubuf;
size_t n;
// fmt
res = CborMapGetKeyById(&parser, &map, data, dataLen, 1);
if (res)
return res;
res = cbor_value_dup_text_string(&map, &buf, &n, &map);
cbor_check(res);
PrintAndLogEx(INFO, "format: %s", buf);
free(buf);
// authData
uint8_t authData[400] = {0};
size_t authDataLen = 0;
res = CborMapGetKeyById(&parser, &map, data, dataLen, 2);
if (res)
return res;
res = cbor_value_dup_byte_string(&map, &ubuf, &n, &map);
cbor_check(res);
authDataLen = n;
memcpy(authData, ubuf, authDataLen);
if (verbose2) {
PrintAndLogEx(INFO, "authData[%zu]: %s", n, sprint_hex_inrow(authData, authDataLen));
} else {
PrintAndLogEx(INFO, "authData[%zu]: %s...", n, sprint_hex(authData, MIN(authDataLen, 16)));
}
PrintAndLogEx(INFO, "RP ID Hash: %s", sprint_hex(ubuf, 32));
// check RP ID Hash
if (CheckrpIdHash(root, ubuf)) {
PrintAndLogEx(SUCCESS, "rpIdHash OK.");
} else {
PrintAndLogEx(ERR, "rpIdHash ERROR!");
}
PrintAndLogEx(INFO, "Flags 0x%02x:", ubuf[32]);
if (!ubuf[32])
PrintAndLogEx(SUCCESS, "none");
if (ubuf[32] & 0x01)
PrintAndLogEx(SUCCESS, "up - user presence result");
if (ubuf[32] & 0x04)
PrintAndLogEx(SUCCESS, "uv - user verification (fingerprint scan or a PIN or ...) result");
if (ubuf[32] & 0x40)
PrintAndLogEx(SUCCESS, "at - attested credential data included");
if (ubuf[32] & 0x80)
PrintAndLogEx(SUCCESS, "ed - extension data included");
uint32_t cntr = (uint32_t)bytes_to_num(&ubuf[33], 4);
PrintAndLogEx(SUCCESS, "Counter: %d", cntr);
JsonSaveInt(root, "$.AppData.Counter", cntr);
// attestation data
PrintAndLogEx(SUCCESS, "AAGUID: %s", sprint_hex(&ubuf[37], 16));
JsonSaveBufAsHexCompact(root, "$.AppData.AAGUID", &ubuf[37], 16);
// Credential ID
uint8_t cridlen = (uint16_t)bytes_to_num(&ubuf[53], 2);
PrintAndLogEx(SUCCESS, "Credential id[%d]: %s", cridlen, sprint_hex_inrow(&ubuf[55], cridlen));
JsonSaveInt(root, "$.AppData.CredentialIdLen", cridlen);
JsonSaveBufAsHexCompact(root, "$.AppData.CredentialId", &ubuf[55], cridlen);
//Credentional public key (COSE_KEY)
uint8_t coseKey[65] = {0};
uint16_t cplen = n - 55 - cridlen;
if (verbose2) {
PrintAndLogEx(SUCCESS, "Credentional public key (COSE_KEY)[%d]: %s", cplen, sprint_hex_inrow(&ubuf[55 + cridlen], cplen));
} else {
PrintAndLogEx(SUCCESS, "Credentional public key (COSE_KEY)[%d]: %s...", cplen, sprint_hex(&ubuf[55 + cridlen], MIN(cplen, 16)));
}
JsonSaveBufAsHexCompact(root, "$.AppData.COSE_KEY", &ubuf[55 + cridlen], cplen);
if (showCBOR) {
PrintAndLogEx(INFO, "COSE structure:");
PrintAndLogEx(NORMAL, "---------------- CBOR ------------------");
TinyCborPrintFIDOPackage(fido2COSEKey, true, &ubuf[55 + cridlen], cplen);
PrintAndLogEx(NORMAL, "---------------- CBOR ------------------");
}
res = COSEGetECDSAKey(&ubuf[55 + cridlen], cplen, verbose, coseKey);
if (res) {
PrintAndLogEx(ERR, "ERROR: Can't get COSE_KEY.");
} else {
PrintAndLogEx(SUCCESS, "COSE public key: %s", sprint_hex_inrow(coseKey, sizeof(coseKey)));
JsonSaveBufAsHexCompact(root, "$.AppData.COSEPublicKey", coseKey, sizeof(coseKey));
}
free(ubuf);
// attStmt - we are check only as DER certificate
int64_t alg = 0;
uint8_t sign[128] = {0};
size_t signLen = 0;
uint8_t der[4097] = {0};
size_t derLen = 0;
res = CborMapGetKeyById(&parser, &map, data, dataLen, 3);
if (res)
return res;
res = cbor_value_enter_container(&map, &mapsmt);
cbor_check(res);
while (!cbor_value_at_end(&mapsmt)) {
char key[100] = {0};
res = CborGetStringValue(&mapsmt, key, sizeof(key), &n);
cbor_check(res);
if (!strcmp(key, "alg")) {
cbor_value_get_int64(&mapsmt, &alg);
PrintAndLogEx(INFO, "Alg [%lld] %s", (long long)alg, GetCOSEAlgDescription(alg));
res = cbor_value_advance_fixed(&mapsmt);
cbor_check(res);
}
if (!strcmp(key, "sig")) {
res = CborGetBinStringValue(&mapsmt, sign, sizeof(sign), &signLen);
cbor_check(res);
if (verbose2) {
PrintAndLogEx(INFO, "signature [%zu]: %s", signLen, sprint_hex_inrow(sign, signLen));
} else {
PrintAndLogEx(INFO, "signature [%zu]: %s...", signLen, sprint_hex(sign, MIN(signLen, 16)));
}
}
if (!strcmp(key, "x5c")) {
res = CborGetArrayBinStringValue(&mapsmt, der, sizeof(der), &derLen);
cbor_check(res);
if (verbose2) {
PrintAndLogEx(NORMAL, "DER certificate[%zu]:\n------------------DER-------------------", derLen);
dump_buffer_simple((const unsigned char *)der, derLen, NULL);
PrintAndLogEx(NORMAL, "\n----------------DER---------------------");
} else {
PrintAndLogEx(NORMAL, "DER [%zu]: %s...", derLen, sprint_hex(der, MIN(derLen, 16)));
}
JsonSaveBufAsHexCompact(root, "$.AppData.DER", der, derLen);
}
}
res = cbor_value_leave_container(&map, &mapsmt);
cbor_check(res);
uint8_t public_key[65] = {0};
// print DER certificate in TLV view
if (showDERTLV) {
PrintAndLogEx(NORMAL, "----------------DER TLV-----------------");
asn1_print(der, derLen, " ");
PrintAndLogEx(NORMAL, "----------------DER TLV-----------------");
}
FIDOCheckDERAndGetKey(der, derLen, verbose, public_key, sizeof(public_key));
JsonSaveBufAsHexCompact(root, "$.AppData.DERPublicKey", public_key, sizeof(public_key));
// check ANSI X9.62 format ECDSA signature (on P-256)
FIDO2CheckSignature(root, public_key, sign, signLen, authData, authDataLen, verbose);
return 0;
}
int FIDO2CreateGetAssertionReq(json_t *root, uint8_t *data, size_t maxdatalen, size_t *datalen, bool createAllowList) {
if (datalen)
*datalen = 0;
if (!root || !data || !maxdatalen)
return 1;
int res;
CborEncoder encoder;
CborEncoder map, array, mapint;
cbor_encoder_init(&encoder, data, maxdatalen, 0);
// create main map
res = cbor_encoder_create_map(&encoder, &map, createAllowList ? 4 : 3);
fido_check_if(res) {
// rpId
res = cbor_encode_uint(&map, 1);
fido_check_if(res) {
res = CBOREncodeElm(root, "$.RelyingPartyEntity.id", &map);
fido_check(res);
}
// clientDataHash
res = cbor_encode_uint(&map, 2);
fido_check_if(res) {
res = CBOREncodeClientDataHash(root, &map);
fido_check(res);
}
// allowList
if (createAllowList) {
res = cbor_encode_uint(&map, 3);
fido_check_if(res) {
res = cbor_encoder_create_array(&map, &array, 1);
fido_check_if(res) {
res = cbor_encoder_create_map(&array, &mapint, 2);
fido_check_if(res) {
res = cbor_encode_text_stringz(&mapint, "type");
fido_check(res);
res = cbor_encode_text_stringz(&mapint, "public-key");
fido_check(res);
res = cbor_encode_text_stringz(&mapint, "id");
fido_check(res);
res = CBOREncodeElm(root, "$.AppData.CredentialId", &mapint);
fido_check(res);
}
res = cbor_encoder_close_container(&array, &mapint);
fido_check(res);
}
res = cbor_encoder_close_container(&map, &array);
fido_check(res);
}
}
// options
res = cbor_encode_uint(&map, 5);
fido_check_if(res) {
res = CBOREncodeElm(root, "GetAssertionOptions", &map);
fido_check(res);
}
}
res = cbor_encoder_close_container(&encoder, &map);
fido_check(res);
size_t len = cbor_encoder_get_buffer_size(&encoder, data);
if (datalen)
*datalen = len;
return 0;
}
int FIDO2GetAssertionParseRes(json_t *root, uint8_t *data, size_t dataLen, bool verbose, bool verbose2, bool showCBOR) {
CborParser parser;
CborValue map, mapint;
int res;
uint8_t *ubuf;
size_t n;
// credential
res = CborMapGetKeyById(&parser, &map, data, dataLen, 1);
if (res)
return res;
res = cbor_value_enter_container(&map, &mapint);
cbor_check(res);
while (!cbor_value_at_end(&mapint)) {
char key[100] = {0};
res = CborGetStringValue(&mapint, key, sizeof(key), &n);
cbor_check(res);
if (!strcmp(key, "type")) {
char ctype[200] = {0};
res = CborGetStringValue(&mapint, ctype, sizeof(ctype), &n);
cbor_check(res);
PrintAndLogEx(SUCCESS, "credential type: %s", ctype);
}
if (!strcmp(key, "id")) {
uint8_t cid[200] = {0};
res = CborGetBinStringValue(&mapint, cid, sizeof(cid), &n);
cbor_check(res);
PrintAndLogEx(SUCCESS, "credential id [%zu]: %s", n, sprint_hex(cid, n));
}
}
res = cbor_value_leave_container(&map, &mapint);
cbor_check(res);
// authData
uint8_t authData[400] = {0};
size_t authDataLen = 0;
res = CborMapGetKeyById(&parser, &map, data, dataLen, 2);
if (res)
return res;
res = cbor_value_dup_byte_string(&map, &ubuf, &n, &map);
cbor_check(res);
authDataLen = n;
memcpy(authData, ubuf, authDataLen);
if (verbose2) {
PrintAndLogEx(INFO, "authData[%zu]: %s", n, sprint_hex_inrow(authData, authDataLen));
} else {
PrintAndLogEx(INFO, "authData[%zu]: %s...", n, sprint_hex(authData, MIN(authDataLen, 16)));
}
PrintAndLogEx(INFO, "RP ID Hash: %s", sprint_hex(ubuf, 32));
// check RP ID Hash
if (CheckrpIdHash(root, ubuf)) {
PrintAndLogEx(SUCCESS, "rpIdHash OK.");
} else {
PrintAndLogEx(ERR, "rpIdHash ERROR!");
}
PrintAndLogEx(INFO, "Flags 0x%02x:", ubuf[32]);
if (!ubuf[32])
PrintAndLogEx(SUCCESS, "none");
if (ubuf[32] & 0x01)
PrintAndLogEx(SUCCESS, "up - user presence result");
if (ubuf[32] & 0x04)
PrintAndLogEx(SUCCESS, "uv - user verification (fingerprint scan or a PIN or ...) result");
if (ubuf[32] & 0x40)
PrintAndLogEx(SUCCESS, "at - attested credential data included");
if (ubuf[32] & 0x80)
PrintAndLogEx(SUCCESS, "ed - extension data included");
uint32_t cntr = (uint32_t)bytes_to_num(&ubuf[33], 4);
PrintAndLogEx(SUCCESS, "Counter: %d", cntr);
JsonSaveInt(root, "$.AppData.Counter", cntr);
free(ubuf);
// publicKeyCredentialUserEntity
res = CborMapGetKeyById(&parser, &map, data, dataLen, 4);
if (res) {
PrintAndLogEx(SUCCESS, "UserEntity n/a");
} else {
res = cbor_value_enter_container(&map, &mapint);
cbor_check(res);
while (!cbor_value_at_end(&mapint)) {
char key[100] = {0};
res = CborGetStringValue(&mapint, key, sizeof(key), &n);
cbor_check(res);
if (!strcmp(key, "name") || !strcmp(key, "displayName")) {
char cname[200] = {0};
res = CborGetStringValue(&mapint, cname, sizeof(cname), &n);
cbor_check(res);
PrintAndLogEx(SUCCESS, "UserEntity %s: %s", key, cname);
}
if (!strcmp(key, "id")) {
uint8_t cid[200] = {0};
res = CborGetBinStringValue(&mapint, cid, sizeof(cid), &n);
cbor_check(res);
PrintAndLogEx(SUCCESS, "UserEntity id [%zu]: %s", n, sprint_hex(cid, n));
// check
uint8_t idbuf[100] = {0};
size_t idbuflen;
JsonLoadBufAsHex(root, "$.UserEntity.id", idbuf, sizeof(idbuf), &idbuflen);
if (idbuflen == n && !memcmp(idbuf, cid, idbuflen)) {
PrintAndLogEx(SUCCESS, "UserEntity id OK.");
} else {
PrintAndLogEx(ERR, "ERROR: Wrong UserEntity id (from json: %s)", sprint_hex(idbuf, idbuflen));
}
}
}
res = cbor_value_leave_container(&map, &mapint);
cbor_check(res);
}
// signature
res = CborMapGetKeyById(&parser, &map, data, dataLen, 3);
if (res)
return res;
res = cbor_value_dup_byte_string(&map, &ubuf, &n, &map);
cbor_check(res);
uint8_t *sign = ubuf;
size_t signLen = n;
cbor_check(res);
if (verbose2) {
PrintAndLogEx(SUCCESS, "signature [%zu]: %s", signLen, sprint_hex_inrow(sign, signLen));
} else {
PrintAndLogEx(SUCCESS, "signature [%zu]: %s...", signLen, sprint_hex(sign, MIN(signLen, 16)));
}
// get public key from json
uint8_t PublicKey[65] = {0};
size_t PublicKeyLen = 0;
JsonLoadBufAsHex(root, "$.AppData.COSEPublicKey", PublicKey, 65, &PublicKeyLen);
// check ANSI X9.62 format ECDSA signature (on P-256)
FIDO2CheckSignature(root, PublicKey, sign, signLen, authData, authDataLen, verbose);
free(ubuf);
// numberOfCredentials
res = CborMapGetKeyById(&parser, &map, data, dataLen, 5);
if (res) {
PrintAndLogEx(SUCCESS, "numberOfCredentials: 1 by default");
} else {
int64_t numberOfCredentials = 0;
cbor_value_get_int64(&map, &numberOfCredentials);
PrintAndLogEx(SUCCESS, "numberOfCredentials: %lld", (long long)numberOfCredentials);
}
return 0;
}