cvs.zerfleddert.de Git - proxmark3-svn/blob - client/fido/fidocore.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2018 Merlok
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // FIDO2 authenticators core data and commands
   9 // https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-client-to-authenticator-protocol-v2.0-id-20180227.html
  10 //-----------------------------------------------------------------------------
  11 //
  12
  13 #include "fidocore.h"
  14 #include "emv/emvcore.h"
  15 #include "emv/emvjson.h"
  16 #include <cbor.h>
  17 #include "cbortools.h"
  18 #include <mbedtls/x509_crt.h>
  19 #include <mbedtls/x509.h>
  20 #include <mbedtls/pk.h>
  21 #include "crypto/asn1utils.h"
  22 #include "crypto/libpcrypto.h"
  23 #include "fido/additional_ca.h"
  24 #include "fido/cose.h"
  25 #include "emv/dump.h"
  26 #include "protocols.h"
  27 #include "ui.h"
  28 #include "util.h"
  29
  30
  31 typedef struct {
  32         uint8_t ErrorCode;
  33         char *ShortDescription;
  34         char *Description;
  35 } fido2Error_t;
  36
  37 fido2Error_t fido2Errors[] = {
  38         {0xFF, "n/a",                                                           "n/a"},
  39         {0x00, "CTAP1_ERR_SUCCESS",                                     "Indicates successful response."},
  40         {0x01, "CTAP1_ERR_INVALID_COMMAND",                     "The command is not a valid CTAP command."},
  41         {0x02, "CTAP1_ERR_INVALID_PARAMETER",           "The command included an invalid parameter."},
  42         {0x03, "CTAP1_ERR_INVALID_LENGTH",                      "Invalid message or item length."},
  43         {0x04, "CTAP1_ERR_INVALID_SEQ",                         "Invalid message sequencing."},
  44         {0x05, "CTAP1_ERR_TIMEOUT",                                     "Message timed out."},
  45         {0x06, "CTAP1_ERR_CHANNEL_BUSY",                        "Channel busy."},
  46         {0x0A, "CTAP1_ERR_LOCK_REQUIRED",                       "Command requires channel lock."},
  47         {0x0B, "CTAP1_ERR_INVALID_CHANNEL",                     "Command not allowed on this cid."},
  48         {0x10, "CTAP2_ERR_CBOR_PARSING",                        "Error while parsing CBOR."},
  49         {0x11, "CTAP2_ERR_CBOR_UNEXPECTED_TYPE",        "Invalid/unexpected CBOR error."},
  50         {0x12, "CTAP2_ERR_INVALID_CBOR",                        "Error when parsing CBOR."},
  51         {0x13, "CTAP2_ERR_INVALID_CBOR_TYPE",           "Invalid or unexpected CBOR type."},
  52         {0x14, "CTAP2_ERR_MISSING_PARAMETER",           "Missing non-optional parameter."},
  53         {0x15, "CTAP2_ERR_LIMIT_EXCEEDED",                      "Limit for number of items exceeded."},
  54         {0x16, "CTAP2_ERR_UNSUPPORTED_EXTENSION",       "Unsupported extension."},
  55         {0x17, "CTAP2_ERR_TOO_MANY_ELEMENTS",           "Limit for number of items exceeded."},
  56         {0x18, "CTAP2_ERR_EXTENSION_NOT_SUPPORTED",     "Unsupported extension."},
  57         {0x19, "CTAP2_ERR_CREDENTIAL_EXCLUDED",         "Valid credential found in the exludeList."},
  58         {0x20, "CTAP2_ERR_CREDENTIAL_NOT_VALID",        "Credential not valid for authenticator."},
  59         {0x21, "CTAP2_ERR_PROCESSING",                          "Processing (Lengthy operation is in progress)."},
  60         {0x22, "CTAP2_ERR_INVALID_CREDENTIAL",          "Credential not valid for the authenticator."},
  61         {0x23, "CTAP2_ERR_USER_ACTION_PENDING",         "Authentication is waiting for user interaction."},
  62         {0x24, "CTAP2_ERR_OPERATION_PENDING",           "Processing, lengthy operation is in progress."},
  63         {0x25, "CTAP2_ERR_NO_OPERATIONS",                       "No request is pending."},
  64         {0x26, "CTAP2_ERR_UNSUPPORTED_ALGORITHM",       "Authenticator does not support requested algorithm."},
  65         {0x27, "CTAP2_ERR_OPERATION_DENIED",            "Not authorized for requested operation."},
  66         {0x28, "CTAP2_ERR_KEY_STORE_FULL",                      "Internal key storage is full."},
  67         {0x29, "CTAP2_ERR_NOT_BUSY",                            "Authenticator cannot cancel as it is not busy."},
  68         {0x2A, "CTAP2_ERR_NO_OPERATION_PENDING",        "No outstanding operations."},
  69         {0x2B, "CTAP2_ERR_UNSUPPORTED_OPTION",          "Unsupported option."},
  70         {0x2C, "CTAP2_ERR_INVALID_OPTION",                      "Unsupported option."},
  71         {0x2D, "CTAP2_ERR_KEEPALIVE_CANCEL",            "Pending keep alive was cancelled."},
  72         {0x2E, "CTAP2_ERR_NO_CREDENTIALS",                      "No valid credentials provided."},
  73         {0x2F, "CTAP2_ERR_USER_ACTION_TIMEOUT",         "Timeout waiting for user interaction."},
  74         {0x30, "CTAP2_ERR_NOT_ALLOWED",                         "Continuation command, such as, authenticatorGetNextAssertion not allowed."},
  75         {0x31, "CTAP2_ERR_PIN_INVALID",                         "PIN Blocked."},
  76         {0x32, "CTAP2_ERR_PIN_BLOCKED",                         "PIN Blocked."},
  77         {0x33, "CTAP2_ERR_PIN_AUTH_INVALID",            "PIN authentication,pinAuth, verification failed."},
  78         {0x34, "CTAP2_ERR_PIN_AUTH_BLOCKED",            "PIN authentication,pinAuth, blocked. Requires power recycle to reset."},
  79         {0x35, "CTAP2_ERR_PIN_NOT_SET",                         "No PIN has been set."},
  80         {0x36, "CTAP2_ERR_PIN_REQUIRED",                        "PIN is required for the selected operation."},
  81         {0x37, "CTAP2_ERR_PIN_POLICY_VIOLATION",        "PIN policy violation. Currently only enforces minimum length."},
  82         {0x38, "CTAP2_ERR_PIN_TOKEN_EXPIRED",           "pinToken expired on authenticator."},
  83         {0x39, "CTAP2_ERR_REQUEST_TOO_LARGE",           "Authenticator cannot handle this request due to memory constraints."},
  84         {0x7F, "CTAP1_ERR_OTHER",                                       "Other unspecified error."},
  85         {0xDF, "CTAP2_ERR_SPEC_LAST",                           "CTAP 2 spec last error."},
  86 };
  87
  88 typedef struct {
  89         fido2Commands Command;
  90         fido2PacketType PckType;
  91         int MemberNumber;
  92         char *Description;
  93 } fido2Desc_t;
  94
  95 fido2Desc_t fido2CmdGetInfoRespDesc[] = {
  96         {fido2CmdMakeCredential,        ptResponse, 0x01, "fmt"},
  97         {fido2CmdMakeCredential,        ptResponse, 0x02, "authData"},
  98         {fido2CmdMakeCredential,        ptResponse, 0x03, "attStmt"},
  99
 100         {fido2CmdMakeCredential,        ptQuery,    0x01, "clientDataHash"},
 101         {fido2CmdMakeCredential,        ptQuery,    0x02, "rp"},
 102         {fido2CmdMakeCredential,        ptQuery,    0x03, "user"},
 103         {fido2CmdMakeCredential,        ptQuery,    0x04, "pubKeyCredParams"},
 104         {fido2CmdMakeCredential,        ptQuery,    0x05, "excludeList"},
 105         {fido2CmdMakeCredential,        ptQuery,    0x06, "extensions"},
 106         {fido2CmdMakeCredential,        ptQuery,    0x07, "options"},
 107         {fido2CmdMakeCredential,        ptQuery,    0x08, "pinAuth"},
 108         {fido2CmdMakeCredential,        ptQuery,    0x09, "pinProtocol"},
 109
 110         {fido2CmdGetAssertion,          ptResponse, 0x01, "credential"},
 111         {fido2CmdGetAssertion,          ptResponse, 0x02, "authData"},
 112         {fido2CmdGetAssertion,          ptResponse, 0x03, "signature"},
 113         {fido2CmdGetAssertion,          ptResponse, 0x04, "publicKeyCredentialUserEntity"},
 114         {fido2CmdGetAssertion,          ptResponse, 0x05, "numberOfCredentials"},
 115
 116         {fido2CmdGetAssertion,          ptQuery,    0x01, "rpId"},
 117         {fido2CmdGetAssertion,          ptQuery,    0x02, "clientDataHash"},
 118         {fido2CmdGetAssertion,          ptQuery,    0x03, "allowList"},
 119         {fido2CmdGetAssertion,          ptQuery,    0x04, "extensions"},
 120         {fido2CmdGetAssertion,          ptQuery,    0x05, "options"},
 121         {fido2CmdGetAssertion,          ptQuery,    0x06, "pinAuth"},
 122         {fido2CmdGetAssertion,          ptQuery,    0x07, "pinProtocol"},
 123
 124         {fido2CmdGetNextAssertion,      ptResponse, 0x01, "credential"},
 125         {fido2CmdGetNextAssertion,      ptResponse, 0x02, "authData"},
 126         {fido2CmdGetNextAssertion,      ptResponse, 0x03, "signature"},
 127         {fido2CmdGetNextAssertion,      ptResponse, 0x04, "publicKeyCredentialUserEntity"},
 128
 129         {fido2CmdGetInfo,                       ptResponse, 0x01, "versions"},
 130         {fido2CmdGetInfo,                       ptResponse, 0x02, "extensions"},
 131         {fido2CmdGetInfo,                       ptResponse, 0x03, "aaguid"},
 132         {fido2CmdGetInfo,                       ptResponse, 0x04, "options"},
 133         {fido2CmdGetInfo,                       ptResponse, 0x05, "maxMsgSize"},
 134         {fido2CmdGetInfo,                       ptResponse, 0x06, "pinProtocols"},
 135
 136         {fido2CmdClientPIN,             ptResponse, 0x01, "keyAgreement"},
 137         {fido2CmdClientPIN,             ptResponse, 0x02, "pinToken"},
 138         {fido2CmdClientPIN,             ptResponse, 0x03, "retries"},
 139
 140         {fido2CmdClientPIN,             ptQuery,    0x01, "pinProtocol"},
 141         {fido2CmdClientPIN,             ptQuery,    0x02, "subCommand"},
 142         {fido2CmdClientPIN,             ptQuery,    0x03, "keyAgreement"},
 143         {fido2CmdClientPIN,             ptQuery,    0x04, "pinAuth"},
 144         {fido2CmdClientPIN,             ptQuery,    0x05, "newPinEnc"},
 145         {fido2CmdClientPIN,             ptQuery,    0x06, "pinHashEnc"},
 146         {fido2CmdClientPIN,             ptQuery,    0x07, "getKeyAgreement"},
 147         {fido2CmdClientPIN,             ptQuery,    0x08, "getRetries"},
 148
 149         {fido2COSEKey,                          ptResponse, 0x01, "kty"},
 150         {fido2COSEKey,                          ptResponse, 0x03, "alg"},
 151         {fido2COSEKey,                          ptResponse,   -1, "crv"},
 152         {fido2COSEKey,                          ptResponse,   -2, "x - coordinate"},
 153         {fido2COSEKey,                          ptResponse,   -3, "y - coordinate"},
 154         {fido2COSEKey,                          ptResponse,   -4, "d - private key"},
 155 };
 156
 157 char *fido2GetCmdErrorDescription(uint8_t errorCode) {
 158         for (int i = 0; i < sizeof(fido2Errors) / sizeof(fido2Error_t); i++)
 159                 if (fido2Errors[i].ErrorCode == errorCode)
 160                         return fido2Errors[i].Description;
 161
 162         return fido2Errors[0].Description;
 163 }
 164
 165 char *fido2GetCmdMemberDescription(uint8_t cmdCode, bool isResponse, int memberNum) {
 166         for (int i = 0; i < sizeof(fido2CmdGetInfoRespDesc) / sizeof(fido2Desc_t); i++)
 167                 if (fido2CmdGetInfoRespDesc[i].Command == cmdCode &&
 168                         fido2CmdGetInfoRespDesc[i].PckType == (isResponse ? ptResponse : ptQuery) &&
 169                         fido2CmdGetInfoRespDesc[i].MemberNumber == memberNum )
 170                         return fido2CmdGetInfoRespDesc[i].Description;
 171
 172         return NULL;
 173 }
 174
 175 int FIDOSelect(bool ActivateField, bool LeaveFieldON, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
 176         uint8_t data[] = {0xA0, 0x00, 0x00, 0x06, 0x47, 0x2F, 0x00, 0x01};
 177
 178         return EMVSelect(ECC_CONTACTLESS, ActivateField, LeaveFieldON, data, sizeof(data), Result, MaxResultLen, ResultLen, sw, NULL);
 179 }
 180
 181 int FIDOExchange(uint8_t* apdu, int apdulen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw) {
 182         int res = EMVExchangeEx(ECC_CONTACTLESS, false, true, apdu, apdulen, Result, MaxResultLen, ResultLen, sw, NULL);
 183         // if (res == 5) // apdu result (sw) not a 0x9000
 184                 // res = 0;
 185         // // software chaining
 186         // while (!res && (*sw >> 8) == 0x61) {
 187                 // uint8_t La = *sw & 0xff;
 188                 // uint8_t get_response_APDU[5] = {apdu[0], ISO7816_GET_RESPONSE, 0x00, 0x00, La};
 189                 // size_t oldlen = *ResultLen;
 190                 // res = EMVExchange(ECC_CONTACTLESS, true, get_response_APDU, sizeof(get_response_APDU), &Result[oldlen], MaxResultLen - oldlen, ResultLen, sw, NULL);
 191                 // if (res == 5) // apdu result (sw) not a 0x9000
 192                         // res = 0;
 193
 194                 // *ResultLen += oldlen;
 195                 // if (*ResultLen > MaxResultLen)
 196                         // return 100;
 197         // }
 198         return res;
 199 }
 200
 201 int FIDORegister(uint8_t *params, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw)
 202 {
 203         uint8_t APDU[5 + 64] = {0x00, 0x01, 0x03, 0x00, 64, 0x00};
 204         memcpy(APDU + 5, params, 64);
 205         return FIDOExchange(APDU, 5 + 64, Result, MaxResultLen, ResultLen, sw);
 206 }
 207
 208 int FIDOAuthentication(uint8_t *params, uint8_t paramslen, uint8_t controlb, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw)
 209 {
 210         uint8_t APDU[APDU_COMMAND_LEN] = {0x00, 0x02, controlb, 0x00, paramslen, 0x00};
 211         memcpy(APDU + 5, params, paramslen);
 212         int apdu_len = 5 + paramslen;
 213         return FIDOExchange(APDU, apdu_len, Result, MaxResultLen, ResultLen, sw);
 214 }
 215
 216 int FIDO2GetInfo(uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw)
 217 {
 218         uint8_t APDU[6] = {0x80, 0x10, 0x00, 0x00, 0x01, fido2CmdGetInfo};
 219         return FIDOExchange(APDU, sizeof(APDU), Result, MaxResultLen, ResultLen, sw);
 220 }
 221
 222 int FIDO2MakeCredential(uint8_t *params, uint8_t paramslen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw)
 223 {
 224         uint8_t APDU[APDU_COMMAND_LEN] = {0x80, 0x10, 0x00, 0x00, paramslen + 1, fido2CmdMakeCredential, 0x00};
 225         memcpy(APDU+6, params, paramslen);
 226         int apdu_len = 5 + paramslen + 1;
 227         return FIDOExchange(APDU, apdu_len, Result, MaxResultLen, ResultLen, sw);
 228 }
 229
 230 int FIDO2GetAssertion(uint8_t *params, uint8_t paramslen, uint8_t *Result, size_t MaxResultLen, size_t *ResultLen, uint16_t *sw)
 231 {
 232         uint8_t APDU[APDU_COMMAND_LEN] = {0x80, 0x10, 0x00, 0x00, paramslen + 1, fido2CmdGetAssertion, 0x00};
 233         memcpy(APDU+6, params, paramslen);
 234         int apdu_len = 5 + paramslen + 1;
 235         return FIDOExchange(APDU, apdu_len, Result, MaxResultLen, ResultLen, sw);
 236 }
 237
 238 int FIDOCheckDERAndGetKey(uint8_t *der, size_t derLen, bool verbose, uint8_t *publicKey, size_t publicKeyMaxLen) {
 239         int res;
 240
 241         // load CA's
 242         mbedtls_x509_crt cacert;
 243         mbedtls_x509_crt_init(&cacert);
 244         res = mbedtls_x509_crt_parse(&cacert, (const unsigned char *) additional_ca_pem, additional_ca_pem_len);
 245         if (res < 0) {
 246                 PrintAndLog("ERROR: CA parse certificate returned -0x%x - %s", -res, ecdsa_get_error(res));
 247         }
 248         if (verbose)
 249                 PrintAndLog("CA load OK. %d skipped", res);
 250
 251         // load DER certificate from authenticator's data
 252         mbedtls_x509_crt cert;
 253         mbedtls_x509_crt_init(&cert);
 254         res = mbedtls_x509_crt_parse_der(&cert, der, derLen);
 255         if (res) {
 256                 PrintAndLog("ERROR: DER parse returned 0x%x - %s", (res<0)?-res:res, ecdsa_get_error(res));
 257         }
 258
 259         // get certificate info
 260         char linfo[300] = {0};
 261         if (verbose) {
 262                 mbedtls_x509_crt_info(linfo, sizeof(linfo), "  ", &cert);
 263                 PrintAndLog("DER certificate info:\n%s", linfo);
 264         }
 265
 266         // verify certificate
 267         uint32_t verifyflags = 0;
 268         res = mbedtls_x509_crt_verify(&cert, &cacert, NULL, NULL, &verifyflags, NULL, NULL);
 269         if (res) {
 270                 PrintAndLog("ERROR: DER verify returned 0x%x - %s\n", (res<0)?-res:res, ecdsa_get_error(res));
 271         } else {
 272                 PrintAndLog("Certificate OK.\n");
 273         }
 274
 275         if (verbose) {
 276                 memset(linfo, 0x00, sizeof(linfo));
 277                 mbedtls_x509_crt_verify_info(linfo, sizeof(linfo), "  ", verifyflags);
 278                 PrintAndLog("Verification info:\n%s", linfo);
 279         }
 280
 281         // get public key
 282         res = ecdsa_public_key_from_pk(&cert.pk, MBEDTLS_ECP_DP_SECP256R1, publicKey, publicKeyMaxLen);
 283         if (res) {
 284                 PrintAndLog("ERROR: getting public key from certificate 0x%x - %s", (res<0)?-res:res, ecdsa_get_error(res));
 285         } else {
 286                 if (verbose)
 287                         PrintAndLog("Got a public key from certificate:\n%s", sprint_hex_inrow(publicKey, 65));
 288         }
 289
 290         if (verbose)
 291                 PrintAndLog("------------------DER-------------------");
 292
 293         mbedtls_x509_crt_free(&cert);
 294         mbedtls_x509_crt_free(&cacert);
 295
 296         return 0;
 297 }
 298
 299 #define fido_check_if(r) if ((r) != CborNoError) {return r;} else
 300 #define fido_check(r) if ((r) != CborNoError) return r;
 301
 302 int FIDO2CreateMakeCredentionalReq(json_t *root, uint8_t *data, size_t maxdatalen, size_t *datalen) {
 303         if (datalen)
 304                 *datalen = 0;
 305         if (!root || !data || !maxdatalen)
 306                 return 1;
 307
 308         int res;
 309         CborEncoder encoder;
 310         CborEncoder map;
 311
 312         cbor_encoder_init(&encoder, data, maxdatalen, 0);
 313
 314         // create main map
 315         res = cbor_encoder_create_map(&encoder, &map, 5);
 316         fido_check_if(res) {
 317                 // clientDataHash
 318                 res = cbor_encode_uint(&map, 1);
 319                 fido_check_if(res) {
 320                         res = CBOREncodeClientDataHash(root, &map);
 321                         fido_check(res);
 322                 }
 323
 324                 // rp
 325                 res = cbor_encode_uint(&map, 2);
 326                 fido_check_if(res) {
 327                         res = CBOREncodeElm(root, "RelyingPartyEntity", &map);
 328                         fido_check(res);
 329                 }
 330
 331                 // user
 332                 res = cbor_encode_uint(&map, 3);
 333                 fido_check_if(res) {
 334                         res = CBOREncodeElm(root, "UserEntity", &map);
 335                         fido_check(res);
 336                 }
 337
 338                 // pubKeyCredParams
 339                 res = cbor_encode_uint(&map, 4);
 340                 fido_check_if(res) {
 341                         res = CBOREncodeElm(root, "pubKeyCredParams", &map);
 342                         fido_check(res);
 343                 }
 344
 345                 // options
 346                 res = cbor_encode_uint(&map, 7);
 347                 fido_check_if(res) {
 348                         res = CBOREncodeElm(root, "MakeCredentialOptions", &map);
 349                         fido_check(res);
 350                 }
 351         }
 352         res = cbor_encoder_close_container(&encoder, &map);
 353         fido_check(res);
 354
 355         size_t len = cbor_encoder_get_buffer_size(&encoder, data);
 356         if (datalen)
 357                 *datalen = len;
 358
 359         return 0;
 360 }
 361
 362 bool CheckrpIdHash(json_t *json, uint8_t *hash) {
 363         char hashval[300] = {0};
 364         uint8_t hash2[32] = {0};
 365
 366         JsonLoadStr(json, "$.RelyingPartyEntity.id", hashval);
 367         sha256hash((uint8_t *)hashval, strlen(hashval), hash2);
 368
 369         return !memcmp(hash, hash2, 32);
 370 }
 371
 372 // check ANSI X9.62 format ECDSA signature (on P-256)
 373 int FIDO2CheckSignature(json_t *root, uint8_t *publickey, uint8_t *sign, size_t signLen, uint8_t *authData, size_t authDataLen, bool verbose) {
 374         int res;
 375         uint8_t rval[300] = {0};
 376         uint8_t sval[300] = {0};
 377         res = ecdsa_asn1_get_signature(sign, signLen, rval, sval);
 378         if (!res) {
 379                 if (verbose) {
 380                         PrintAndLog("  r: %s", sprint_hex(rval, 32));
 381                         PrintAndLog("  s: %s", sprint_hex(sval, 32));
 382                 }
 383
 384                 uint8_t clientDataHash[32] = {0};
 385                 size_t clientDataHashLen = 0;
 386                 res = JsonLoadBufAsHex(root, "$.ClientDataHash", clientDataHash, sizeof(clientDataHash), &clientDataHashLen);
 387                 if (res || clientDataHashLen != 32) {
 388                         PrintAndLog("ERROR: Can't get clientDataHash from json!");
 389                         return 2;
 390                 }
 391
 392                 uint8_t xbuf[4096] = {0};
 393                 size_t xbuflen = 0;
 394                 res = FillBuffer(xbuf, sizeof(xbuf), &xbuflen,
 395                         authData, authDataLen,  // rpIdHash[32] + flags[1] + signCount[4]
 396                         clientDataHash, 32,     // Hash of the serialized client data. "$.ClientDataHash" from json
 397                         NULL, 0);
 398                 //PrintAndLog("--xbuf(%d)[%d]: %s", res, xbuflen, sprint_hex(xbuf, xbuflen));
 399                 res = ecdsa_signature_verify(MBEDTLS_ECP_DP_SECP256R1, publickey, xbuf, xbuflen, sign, signLen, true);
 400                 if (res) {
 401                         if (res == MBEDTLS_ERR_ECP_VERIFY_FAILED) {
 402                                 PrintAndLog("Signature is NOT VALID.");
 403                         } else {
 404                                 PrintAndLog("Other signature check error: %x %s", (res<0)?-res:res, ecdsa_get_error(res));
 405                         }
 406                         return res;
 407                 } else {
 408                         PrintAndLog("Signature is OK.");
 409                 }
 410         } else {
 411                 PrintAndLog("Invalid signature. res=%d.", res);
 412                 return res;
 413         }
 414
 415         return 0;
 416 }
 417
 418 int FIDO2MakeCredentionalParseRes(json_t *root, uint8_t *data, size_t dataLen, bool verbose, bool verbose2, bool showCBOR, bool showDERTLV) {
 419         CborParser parser;
 420         CborValue map, mapsmt;
 421         int res;
 422         char *buf;
 423         uint8_t *ubuf;
 424         size_t n;
 425
 426         // fmt
 427         res = CborMapGetKeyById(&parser, &map, data, dataLen, 1);
 428         if (res)
 429                 return res;
 430
 431         res = cbor_value_dup_text_string(&map, &buf, &n, &map);
 432         cbor_check(res);
 433         PrintAndLog("format: %s", buf);
 434         free(buf);
 435
 436         // authData
 437         uint8_t authData[400] = {0};
 438         size_t authDataLen = 0;
 439         res = CborMapGetKeyById(&parser, &map, data, dataLen, 2);
 440         if (res)
 441                 return res;
 442         res = cbor_value_dup_byte_string(&map, &ubuf, &n, &map);
 443         cbor_check(res);
 444
 445         authDataLen = n;
 446         memcpy(authData, ubuf, authDataLen);
 447
 448         if (verbose2) {
 449                 PrintAndLog("authData[%d]: %s", n, sprint_hex_inrow(authData, authDataLen));
 450         } else {
 451                 PrintAndLog("authData[%d]: %s...", n, sprint_hex(authData, MIN(authDataLen, 16)));
 452         }
 453
 454         PrintAndLog("RP ID Hash: %s", sprint_hex(ubuf, 32));
 455
 456         // check RP ID Hash
 457         if (CheckrpIdHash(root, ubuf)) {
 458                 PrintAndLog("rpIdHash OK.");
 459         } else {
 460                 PrintAndLog("rpIdHash ERROR!");
 461         }
 462
 463         PrintAndLog("Flags 0x%02x:", ubuf[32]);
 464         if (!ubuf[32])
 465                 PrintAndLog("none");
 466         if (ubuf[32] & 0x01)
 467                 PrintAndLog("up - user presence result");
 468         if (ubuf[32] & 0x04)
 469                 PrintAndLog("uv - user verification (fingerprint scan or a PIN or ...) result");
 470         if (ubuf[32] & 0x40)
 471                 PrintAndLog("at - attested credential data included");
 472         if (ubuf[32] & 0x80)
 473                 PrintAndLog("ed - extension data included");
 474
 475         uint32_t cntr =  (uint32_t)bytes_to_num(&ubuf[33], 4);
 476         PrintAndLog("Counter: %d", cntr);
 477         JsonSaveInt(root, "$.AppData.Counter", cntr);
 478
 479         // attestation data
 480         PrintAndLog("AAGUID: %s", sprint_hex(&ubuf[37], 16));
 481         JsonSaveBufAsHexCompact(root, "$.AppData.AAGUID", &ubuf[37], 16);
 482
 483         // Credential ID
 484         uint8_t cridlen = (uint16_t)bytes_to_num(&ubuf[53], 2);
 485         PrintAndLog("Credential id[%d]: %s", cridlen, sprint_hex_inrow(&ubuf[55], cridlen));
 486         JsonSaveInt(root, "$.AppData.CredentialIdLen", cridlen);
 487         JsonSaveBufAsHexCompact(root, "$.AppData.CredentialId", &ubuf[55], cridlen);
 488
 489         //Credentional public key (COSE_KEY)
 490         uint8_t coseKey[65] = {0};
 491         uint16_t cplen = n - 55 - cridlen;
 492         if (verbose2) {
 493                 PrintAndLog("Credentional public key (COSE_KEY)[%d]: %s", cplen, sprint_hex_inrow(&ubuf[55 + cridlen], cplen));
 494         } else {
 495                 PrintAndLog("Credentional public key (COSE_KEY)[%d]: %s...", cplen, sprint_hex(&ubuf[55 + cridlen], MIN(cplen, 16)));
 496         }
 497         JsonSaveBufAsHexCompact(root, "$.AppData.COSE_KEY", &ubuf[55 + cridlen], cplen);
 498
 499         if (showCBOR) {
 500                 PrintAndLog("COSE structure:");
 501                 PrintAndLog("---------------- CBOR ------------------");
 502                 TinyCborPrintFIDOPackage(fido2COSEKey, true, &ubuf[55 + cridlen], cplen);
 503                 PrintAndLog("---------------- CBOR ------------------");
 504         }
 505
 506         res = COSEGetECDSAKey(&ubuf[55 + cridlen], cplen, verbose, coseKey);
 507         if (res) {
 508                 PrintAndLog("ERROR: Can't get COSE_KEY.");
 509         } else {
 510                 PrintAndLog("COSE public key: %s", sprint_hex_inrow(coseKey, sizeof(coseKey)));
 511                 JsonSaveBufAsHexCompact(root, "$.AppData.COSEPublicKey", coseKey, sizeof(coseKey));
 512         }
 513
 514         free(ubuf);
 515
 516         // attStmt - we are check only as DER certificate
 517         int64_t alg = 0;
 518         uint8_t sign[128] = {0};
 519         size_t signLen = 0;
 520         uint8_t der[4097] = {0};
 521         size_t derLen = 0;
 522
 523         res = CborMapGetKeyById(&parser, &map, data, dataLen, 3);
 524         if (res)
 525                 return res;
 526
 527         res = cbor_value_enter_container(&map, &mapsmt);
 528         cbor_check(res);
 529
 530         while (!cbor_value_at_end(&mapsmt)) {
 531                 char key[100] = {0};
 532                 res = CborGetStringValue(&mapsmt, key, sizeof(key), &n);
 533                 cbor_check(res);
 534                 if (!strcmp(key, "alg")) {
 535                         cbor_value_get_int64(&mapsmt, &alg);
 536                         PrintAndLog("Alg [%lld] %s", (long long)alg, GetCOSEAlgDescription(alg));
 537                         res = cbor_value_advance_fixed(&mapsmt);
 538                         cbor_check(res);
 539                 }
 540
 541                 if (!strcmp(key, "sig")) {
 542                         res = CborGetBinStringValue(&mapsmt, sign, sizeof(sign), &signLen);
 543                         cbor_check(res);
 544                         if (verbose2) {
 545                                 PrintAndLog("signature [%d]: %s", signLen, sprint_hex_inrow(sign, signLen));
 546                         } else {
 547                                 PrintAndLog("signature [%d]: %s...", signLen, sprint_hex(sign, MIN(signLen, 16)));
 548                         }
 549                 }
 550
 551                 if (!strcmp(key, "x5c")) {
 552                         res = CborGetArrayBinStringValue(&mapsmt, der, sizeof(der), &derLen);
 553                         cbor_check(res);
 554                         if (verbose2) {
 555                                 PrintAndLog("DER certificate[%d]:\n------------------DER-------------------", derLen);
 556                                 dump_buffer_simple((const unsigned char *)der, derLen, NULL);
 557                                 PrintAndLog("\n----------------DER---------------------");
 558                         } else {
 559                                 PrintAndLog("DER [%d]: %s...", derLen, sprint_hex(der, MIN(derLen, 16)));
 560                         }
 561                                 JsonSaveBufAsHexCompact(root, "$.AppData.DER", der, derLen);
 562                 }
 563         }
 564         res = cbor_value_leave_container(&map, &mapsmt);
 565         cbor_check(res);
 566
 567         uint8_t public_key[65] = {0};
 568
 569         // print DER certificate in TLV view
 570         if (showDERTLV) {
 571                 PrintAndLog("----------------DER TLV-----------------");
 572                 asn1_print(der, derLen, "  ");
 573                 PrintAndLog("----------------DER TLV-----------------");
 574         }
 575     FIDOCheckDERAndGetKey(der, derLen, verbose, public_key, sizeof(public_key));
 576         JsonSaveBufAsHexCompact(root, "$.AppData.DERPublicKey", public_key, sizeof(public_key));
 577
 578         // check ANSI X9.62 format ECDSA signature (on P-256)
 579         FIDO2CheckSignature(root, public_key, sign, signLen, authData, authDataLen, verbose);
 580
 581         return 0;
 582 }
 583
 584 int FIDO2CreateGetAssertionReq(json_t *root, uint8_t *data, size_t maxdatalen, size_t *datalen, bool createAllowList) {
 585         if (datalen)
 586                 *datalen = 0;
 587         if (!root || !data || !maxdatalen)
 588                 return 1;
 589
 590         int res;
 591         CborEncoder encoder;
 592         CborEncoder map, array, mapint;
 593
 594         cbor_encoder_init(&encoder, data, maxdatalen, 0);
 595
 596         // create main map
 597         res = cbor_encoder_create_map(&encoder, &map, createAllowList ? 4 : 3);
 598         fido_check_if(res) {
 599                 // rpId
 600                 res = cbor_encode_uint(&map, 1);
 601                 fido_check_if(res) {
 602                         res = CBOREncodeElm(root, "$.RelyingPartyEntity.id", &map);
 603                         fido_check(res);
 604                 }
 605
 606                 // clientDataHash
 607                 res = cbor_encode_uint(&map, 2);
 608                 fido_check_if(res) {
 609                         res = CBOREncodeClientDataHash(root, &map);
 610                         fido_check(res);
 611                 }
 612
 613                 // allowList
 614                 if (createAllowList) {
 615                         res = cbor_encode_uint(&map, 3);
 616                         fido_check_if(res) {
 617                                 res = cbor_encoder_create_array(&map, &array, 1);
 618                                 fido_check_if(res) {
 619                                         res = cbor_encoder_create_map(&array, &mapint, 2);
 620                                         fido_check_if(res) {
 621                                                 res = cbor_encode_text_stringz(&mapint, "type");
 622                                                 fido_check(res);
 623
 624                                                 res = cbor_encode_text_stringz(&mapint, "public-key");
 625                                                 fido_check(res);
 626
 627                                                 res = cbor_encode_text_stringz(&mapint, "id");
 628                                                 fido_check(res);
 629
 630                                                 res = CBOREncodeElm(root, "$.AppData.CredentialId", &mapint);
 631                                                 fido_check(res);
 632                                         }
 633                                         res = cbor_encoder_close_container(&array, &mapint);
 634                                         fido_check(res);
 635                                 }
 636                                 res = cbor_encoder_close_container(&map, &array);
 637                                 fido_check(res);
 638                         }
 639                 }
 640
 641                 // options
 642                 res = cbor_encode_uint(&map, 5);
 643                 fido_check_if(res) {
 644                         res = CBOREncodeElm(root, "GetAssertionOptions", &map);
 645                         fido_check(res);
 646                 }
 647         }
 648         res = cbor_encoder_close_container(&encoder, &map);
 649         fido_check(res);
 650
 651         size_t len = cbor_encoder_get_buffer_size(&encoder, data);
 652         if (datalen)
 653                 *datalen = len;
 654
 655         return 0;
 656 }
 657
 658 int FIDO2GetAssertionParseRes(json_t *root, uint8_t *data, size_t dataLen, bool verbose, bool verbose2, bool showCBOR) {
 659         CborParser parser;
 660         CborValue map, mapint;
 661         int res;
 662         uint8_t *ubuf;
 663         size_t n;
 664
 665         // credential
 666         res = CborMapGetKeyById(&parser, &map, data, dataLen, 1);
 667         if (res)
 668                 return res;
 669
 670         res = cbor_value_enter_container(&map, &mapint);
 671         cbor_check(res);
 672
 673         while (!cbor_value_at_end(&mapint)) {
 674                 char key[100] = {0};
 675                 res = CborGetStringValue(&mapint, key, sizeof(key), &n);
 676                 cbor_check(res);
 677
 678                 if (!strcmp(key, "type")) {
 679                         char ctype[200] = {0};
 680                         res = CborGetStringValue(&mapint, ctype, sizeof(ctype), &n);
 681                         cbor_check(res);
 682                         PrintAndLog("credential type: %s", ctype);
 683                 }
 684
 685                 if (!strcmp(key, "id")) {
 686                         uint8_t cid[200] = {0};
 687                         res = CborGetBinStringValue(&mapint, cid, sizeof(cid), &n);
 688                         cbor_check(res);
 689                         PrintAndLog("credential id [%d]: %s", n, sprint_hex(cid, n));
 690                 }
 691         }
 692         res = cbor_value_leave_container(&map, &mapint);
 693         cbor_check(res);
 694
 695         // authData
 696         uint8_t authData[400] = {0};
 697         size_t authDataLen = 0;
 698         res = CborMapGetKeyById(&parser, &map, data, dataLen, 2);
 699         if (res)
 700                 return res;
 701         res = cbor_value_dup_byte_string(&map, &ubuf, &n, &map);
 702         cbor_check(res);
 703
 704         authDataLen = n;
 705         memcpy(authData, ubuf, authDataLen);
 706
 707         if (verbose2) {
 708                 PrintAndLog("authData[%d]: %s", n, sprint_hex_inrow(authData, authDataLen));
 709         } else {
 710                 PrintAndLog("authData[%d]: %s...", n, sprint_hex(authData, MIN(authDataLen, 16)));
 711         }
 712
 713         PrintAndLog("RP ID Hash: %s", sprint_hex(ubuf, 32));
 714
 715         // check RP ID Hash
 716         if (CheckrpIdHash(root, ubuf)) {
 717                 PrintAndLog("rpIdHash OK.");
 718         } else {
 719                 PrintAndLog("rpIdHash ERROR!");
 720         }
 721
 722         PrintAndLog("Flags 0x%02x:", ubuf[32]);
 723         if (!ubuf[32])
 724                 PrintAndLog("none");
 725         if (ubuf[32] & 0x01)
 726                 PrintAndLog("up - user presence result");
 727         if (ubuf[32] & 0x04)
 728                 PrintAndLog("uv - user verification (fingerprint scan or a PIN or ...) result");
 729         if (ubuf[32] & 0x40)
 730                 PrintAndLog("at - attested credential data included");
 731         if (ubuf[32] & 0x80)
 732                 PrintAndLog("ed - extension data included");
 733
 734         uint32_t cntr =  (uint32_t)bytes_to_num(&ubuf[33], 4);
 735         PrintAndLog("Counter: %d", cntr);
 736         JsonSaveInt(root, "$.AppData.Counter", cntr);
 737
 738         free(ubuf);
 739
 740         // publicKeyCredentialUserEntity
 741         res = CborMapGetKeyById(&parser, &map, data, dataLen, 4);
 742         if (res) {
 743                 PrintAndLog("UserEntity n/a");
 744         } else {
 745                 res = cbor_value_enter_container(&map, &mapint);
 746                 cbor_check(res);
 747
 748                 while (!cbor_value_at_end(&mapint)) {
 749                         char key[100] = {0};
 750                         res = CborGetStringValue(&mapint, key, sizeof(key), &n);
 751                         cbor_check(res);
 752
 753                         if (!strcmp(key, "name") || !strcmp(key, "displayName")) {
 754                                 char cname[200] = {0};
 755                                 res = CborGetStringValue(&mapint, cname, sizeof(cname), &n);
 756                                 cbor_check(res);
 757                                 PrintAndLog("UserEntity %s: %s", key, cname);
 758                         }
 759
 760                         if (!strcmp(key, "id")) {
 761                                 uint8_t cid[200] = {0};
 762                                 res = CborGetBinStringValue(&mapint, cid, sizeof(cid), &n);
 763                                 cbor_check(res);
 764                                 PrintAndLog("UserEntity id [%d]: %s", n, sprint_hex(cid, n));
 765
 766                                 // check
 767                                 uint8_t idbuf[100] = {0};
 768                                 size_t idbuflen;
 769
 770                                 JsonLoadBufAsHex(root, "$.UserEntity.id", idbuf, sizeof(idbuf), &idbuflen);
 771
 772                                 if (idbuflen == n && !memcmp(idbuf, cid, idbuflen)) {
 773                                         PrintAndLog("UserEntity id OK.");
 774                                 } else {
 775                                         PrintAndLog("ERROR: Wrong UserEntity id (from json: %s)", sprint_hex(idbuf, idbuflen));
 776                                 }
 777                         }
 778                 }
 779                 res = cbor_value_leave_container(&map, &mapint);
 780                 cbor_check(res);
 781         }
 782
 783
 784         // signature
 785         res = CborMapGetKeyById(&parser, &map, data, dataLen, 3);
 786         if (res)
 787                 return res;
 788         res = cbor_value_dup_byte_string(&map, &ubuf, &n, &map);
 789         cbor_check(res);
 790
 791         uint8_t *sign = ubuf;
 792         size_t signLen = n;
 793
 794         cbor_check(res);
 795         if (verbose2) {
 796                 PrintAndLog("signature [%d]: %s", signLen, sprint_hex_inrow(sign, signLen));
 797         } else {
 798                 PrintAndLog("signature [%d]: %s...", signLen, sprint_hex(sign, MIN(signLen, 16)));
 799         }
 800
 801         // get public key from json
 802         uint8_t PublicKey[65] = {0};
 803         size_t PublicKeyLen = 0;
 804         JsonLoadBufAsHex(root, "$.AppData.COSEPublicKey", PublicKey, 65, &PublicKeyLen);
 805
 806         // check ANSI X9.62 format ECDSA signature (on P-256)
 807         FIDO2CheckSignature(root, PublicKey, sign, signLen, authData, authDataLen, verbose);
 808
 809         free(ubuf);
 810
 811         // numberOfCredentials
 812         res = CborMapGetKeyById(&parser, &map, data, dataLen, 5);
 813         if (res) {
 814                 PrintAndLog("numberOfCredentials: 1 by default");
 815         } else {
 816                 int64_t numberOfCredentials = 0;
 817                 cbor_value_get_int64(&map, &numberOfCredentials);
 818                 PrintAndLog("numberOfCredentials: %lld", (long long)numberOfCredentials);
 819         }
 820
 821         return 0;
 822 }