772 lines
31 KiB
C
772 lines
31 KiB
C
/*
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* This file is part of the Pico FIDO distribution (https://github.com/polhenarejos/pico-fido).
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* Copyright (c) 2022 Pol Henarejos.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "pico_keys.h"
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#include "cbor.h"
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#include "ctap.h"
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#if defined(PICO_PLATFORM)
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#include "bsp/board.h"
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#endif
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#include "hid/ctap_hid.h"
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#include "fido.h"
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#include "files.h"
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#include "crypto_utils.h"
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#include "apdu.h"
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#include "cbor_make_credential.h"
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#include "credential.h"
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#include "mbedtls/sha256.h"
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#include "random.h"
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int cbor_get_assertion(const uint8_t *data, size_t len, bool next);
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bool residentx = false;
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Credential credsx[MAX_CREDENTIAL_COUNT_IN_LIST] = { 0 };
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uint8_t credentialCounter = 1;
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uint8_t numberOfCredentialsx = 0;
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uint8_t flagsx = 0;
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uint32_t timerx = 0;
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uint8_t *datax = NULL;
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size_t lenx = 0;
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int cbor_get_next_assertion(const uint8_t *data, size_t len) {
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(void) data;
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(void) len;
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CborError error = CborNoError;
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if (credentialCounter >= numberOfCredentialsx) {
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CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
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}
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if (timerx + 30 * 1000 < board_millis()) {
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CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
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}
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CBOR_CHECK(cbor_get_assertion(datax, lenx, true));
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timerx = board_millis();
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credentialCounter++;
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err:
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if (error != CborNoError || credentialCounter == numberOfCredentialsx) {
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for (int i = 0; i < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
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credential_free(&credsx[i]);
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}
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if (datax) {
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free(datax);
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datax = NULL;
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}
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lenx = 0;
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residentx = false;
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timerx = 0;
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flagsx = 0;
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credentialCounter = 0;
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numberOfCredentialsx = 0;
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if (error == CborErrorImproperValue) {
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return CTAP2_ERR_CBOR_UNEXPECTED_TYPE;
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}
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return error;
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}
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return 0;
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}
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int cbor_get_assertion(const uint8_t *data, size_t len, bool next) {
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size_t resp_size = 0;
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uint64_t pinUvAuthProtocol = 0, hmacSecretPinUvAuthProtocol = 1;
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CredOptions options = { 0 };
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CredExtensions extensions = { 0 };
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CborParser parser;
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CborEncoder encoder, mapEncoder, mapEncoder2;
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CborValue map;
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CborError error = CborNoError;
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CborByteString pinUvAuthParam = { 0 }, clientDataHash = { 0 };
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CborCharString rpId = { 0 };
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PublicKeyCredentialDescriptor allowList[MAX_CREDENTIAL_COUNT_IN_LIST] = { 0 };
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Credential creds[MAX_CREDENTIAL_COUNT_IN_LIST] = { 0 };
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size_t allowList_len = 0, creds_len = 0;
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uint8_t *aut_data = NULL;
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bool asserted = false, up = false, uv = false;
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int64_t kty = 2, alg = 0, crv = 0;
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CborByteString kax = { 0 }, kay = { 0 }, salt_enc = { 0 }, salt_auth = { 0 };
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const bool *credBlob = NULL;
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CBOR_CHECK(cbor_parser_init(data, len, 0, &parser, &map));
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uint64_t val_c = 1;
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CBOR_PARSE_MAP_START(map, 1)
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{
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uint64_t val_u = 0;
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CBOR_FIELD_GET_UINT(val_u, 1);
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if (val_c <= 2 && val_c != val_u) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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if (val_u < val_c) {
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CBOR_ERROR(CTAP2_ERR_INVALID_CBOR);
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}
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val_c = val_u + 1;
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if (val_u == 0x01) {
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CBOR_FIELD_GET_TEXT(rpId, 1);
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}
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else if (val_u == 0x02) {
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CBOR_FIELD_GET_BYTES(clientDataHash, 1);
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}
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else if (val_u == 0x03) { // excludeList
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CBOR_PARSE_ARRAY_START(_f1, 2)
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{
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PublicKeyCredentialDescriptor *pc = &allowList[allowList_len];
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CBOR_PARSE_MAP_START(_f2, 3)
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{
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CBOR_FIELD_GET_KEY_TEXT(3);
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CBOR_FIELD_KEY_TEXT_VAL_BYTES(3, "id", pc->id);
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CBOR_FIELD_KEY_TEXT_VAL_TEXT(3, "type", pc->type);
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if (strcmp(_fd3, "transports") == 0) {
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CBOR_PARSE_ARRAY_START(_f3, 4)
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{
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CBOR_FIELD_GET_TEXT(pc->transports[pc->transports_len], 4);
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pc->transports_len++;
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}
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CBOR_PARSE_ARRAY_END(_f3, 4);
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}
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}
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CBOR_PARSE_MAP_END(_f2, 3);
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allowList_len++;
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}
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CBOR_PARSE_ARRAY_END(_f1, 2);
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}
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else if (val_u == 0x04) { // extensions
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extensions.present = true;
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CBOR_PARSE_MAP_START(_f1, 2)
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{
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CBOR_FIELD_GET_KEY_TEXT(2);
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if (strcmp(_fd2, "hmac-secret") == 0) {
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extensions.hmac_secret = ptrue;
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uint64_t ukey = 0;
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CBOR_PARSE_MAP_START(_f2, 3)
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{
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CBOR_FIELD_GET_UINT(ukey, 3);
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if (ukey == 0x01) {
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CBOR_CHECK(COSE_read_key(&_f3, &kty, &alg, &crv, &kax, &kay));
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}
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else if (ukey == 0x02) {
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CBOR_FIELD_GET_BYTES(salt_enc, 3);
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}
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else if (ukey == 0x03) {
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CBOR_FIELD_GET_BYTES(salt_auth, 3);
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}
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else if (ukey == 0x04) {
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CBOR_FIELD_GET_UINT(hmacSecretPinUvAuthProtocol, 3);
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}
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else {
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CBOR_ADVANCE(3);
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}
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}
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CBOR_PARSE_MAP_END(_f2, 3);
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continue;
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}
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CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "credBlob", credBlob);
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CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "largeBlobKey", extensions.largeBlobKey);
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CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "thirdPartyPayment", extensions.thirdPartyPayment);
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CBOR_ADVANCE(2);
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}
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CBOR_PARSE_MAP_END(_f1, 2);
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}
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else if (val_u == 0x05) { // options
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options.present = true;
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CBOR_PARSE_MAP_START(_f1, 2)
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{
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CBOR_FIELD_GET_KEY_TEXT(2);
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CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "rk", options.rk);
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CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "up", options.up);
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CBOR_FIELD_KEY_TEXT_VAL_BOOL(2, "uv", options.uv);
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CBOR_ADVANCE(2);
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}
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CBOR_PARSE_MAP_END(_f1, 2);
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}
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else if (val_u == 0x06) { // pinUvAuthParam
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CBOR_FIELD_GET_BYTES(pinUvAuthParam, 1);
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}
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else if (val_u == 0x07) { // pinUvAuthProtocol
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CBOR_FIELD_GET_UINT(pinUvAuthProtocol, 1);
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}
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}
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CBOR_PARSE_MAP_END(map, 1);
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if (rpId.present == false || clientDataHash.present == false) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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uint8_t flags = 0;
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uint8_t rp_id_hash[32] = {0};
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mbedtls_sha256((uint8_t *) rpId.data, rpId.len, rp_id_hash, 0);
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bool resident = false;
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uint8_t numberOfCredentials = 0;
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Credential *selcred = NULL;
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if (next == false) {
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if (pinUvAuthParam.present == true) {
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if (pinUvAuthParam.len == 0 || pinUvAuthParam.data == NULL) {
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if (check_user_presence() == false) {
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CBOR_ERROR(CTAP2_ERR_OPERATION_DENIED);
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}
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if (!file_has_data(ef_pin)) {
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CBOR_ERROR(CTAP2_ERR_PIN_NOT_SET);
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}
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else {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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}
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else {
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if (pinUvAuthProtocol == 0) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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if (pinUvAuthProtocol != 1 && pinUvAuthProtocol != 2) {
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CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
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}
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}
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}
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if (options.present) {
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if (options.uv == ptrue) { //4.3
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CBOR_ERROR(CTAP2_ERR_INVALID_OPTION);
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}
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if (options.uv == NULL || pinUvAuthParam.present == true) {
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uv = false;
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}
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else {
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uv = *options.uv;
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}
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//if (options.up != NULL) { //4.5
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// CBOR_ERROR(CTAP2_ERR_INVALID_OPTION);
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//}
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if (options.rk != NULL) {
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CBOR_ERROR(CTAP2_ERR_UNSUPPORTED_OPTION);
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}
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//else if (options.up == NULL) //5.7
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//rup = ptrue;
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if (options.up != NULL) {
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up = *options.up;
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}
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else {
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up = true;
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}
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}
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if (pinUvAuthParam.present == true) { //6.1
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int ret = verify((uint8_t)pinUvAuthProtocol, paut.data, clientDataHash.data, (uint16_t)clientDataHash.len, pinUvAuthParam.data);
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if (ret != CborNoError) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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if (getUserVerifiedFlagValue() == false) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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if (!(paut.permissions & CTAP_PERMISSION_GA)) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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if (paut.has_rp_id == true && memcmp(paut.rp_id_hash, rp_id_hash, 32) != 0) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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flags |= FIDO2_AUT_FLAG_UV;
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// Check pinUvAuthToken permissions. See 6.2.2.4
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}
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if (extensions.present == true && extensions.hmac_secret == ptrue) {
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if (kax.present == false || kay.present == false || crv == 0 || alg == 0 ||
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salt_enc.present == false || salt_auth.present == false) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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if (salt_enc.len != 32 + (hmacSecretPinUvAuthProtocol - 1) * IV_SIZE &&
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salt_enc.len != 64 + (hmacSecretPinUvAuthProtocol - 1) * IV_SIZE) {
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CBOR_ERROR(CTAP1_ERR_INVALID_LEN);
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}
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}
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bool silent = (up == false && uv == false);
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if (allowList_len > 0) {
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for (size_t e = 0; e < allowList_len; e++) {
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if (allowList[e].type.present == false || allowList[e].id.present == false) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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if (strcmp(allowList[e].type.data, "public-key") != 0) {
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continue;
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}
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if (credential_is_resident(allowList[e].id.data, allowList[e].id.len)) {
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS && creds_len < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
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file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
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if (!file_has_data(ef) || memcmp(file_get_data(ef), rp_id_hash, 32) != 0) {
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continue;
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}
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if (memcmp(file_get_data(ef) + 32, allowList[e].id.data, CRED_RESIDENT_LEN) == 0) {
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if (credential_load_resident(ef, rp_id_hash, &creds[creds_len]) != 0) {
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// Should never happen
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credential_free(&creds[creds_len]);
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continue;
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}
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resident = true;
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creds_len++;
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silent = false; // If we are able to load a credential, we are not silent
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break;
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}
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}
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}
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else {
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if (credential_load(allowList[e].id.data, allowList[e].id.len, rp_id_hash, &creds[creds_len]) != 0) {
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credential_free(&creds[creds_len]);
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}
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else {
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creds_len++;
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silent = false; // If we are able to load a credential, we are not silent
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// Even we provide allowList, we need to check if the credential is resident
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if (!resident) {
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS && creds_len < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
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file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
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if (!file_has_data(ef) || memcmp(file_get_data(ef), rp_id_hash, 32) != 0) {
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continue;
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}
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if (memcmp(file_get_data(ef) + 32, allowList[e].id.data, allowList[e].id.len) == 0) {
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resident = true;
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break;
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}
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}
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if (resident) {
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break;
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}
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}
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}
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}
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}
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}
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else {
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS && creds_len < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
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file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
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if (!file_has_data(ef) || memcmp(file_get_data(ef), rp_id_hash, 32) != 0) {
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continue;
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}
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int ret = credential_load_resident(ef, rp_id_hash, &creds[creds_len]);
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if (ret != 0) {
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credential_free(&creds[creds_len]);
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}
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else {
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creds_len++;
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silent = false; // If we are able to load a credential, we are not silent
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}
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}
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resident = true;
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}
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for (size_t i = 0; i < creds_len; i++) {
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if (creds[i].present == true) {
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if (creds[i].extensions.present == true) {
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if (creds[i].extensions.credProtect == CRED_PROT_UV_REQUIRED && !(flags & FIDO2_AUT_FLAG_UV)) {
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credential_free(&creds[i]);
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}
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else if (creds[i].extensions.credProtect == CRED_PROT_UV_OPTIONAL_WITH_LIST && allowList_len == 0 && !(flags & FIDO2_AUT_FLAG_UV)) {
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credential_free(&creds[i]);
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}
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else {
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if (numberOfCredentials != i) {
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creds[numberOfCredentials++] = creds[i];
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}
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else {
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numberOfCredentials++;
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}
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}
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}
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else {
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if (numberOfCredentials != i) {
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creds[numberOfCredentials++] = creds[i];
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}
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else {
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numberOfCredentials++;
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}
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}
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}
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}
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if (numberOfCredentials == 0) {
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if (silent && allowList_len > 0) {
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for (size_t e = 0; e < allowList_len; e++) {
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if (allowList[e].type.present == false || allowList[e].id.present == false) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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if (strcmp(allowList[e].type.data, "public-key") != 0) {
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continue;
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}
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if (credential_is_resident(allowList[e].id.data, allowList[e].id.len)) {
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS && creds_len < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
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file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
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if (!file_has_data(ef) || memcmp(file_get_data(ef), rp_id_hash, 32) != 0) {
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continue;
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}
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if (memcmp(file_get_data(ef) + 32, allowList[e].id.data, CRED_RESIDENT_LEN) == 0) {
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if (credential_verify(file_get_data(ef) + 32 + CRED_RESIDENT_LEN, file_get_size(ef) - 32 - CRED_RESIDENT_LEN, rp_id_hash, true) == 0) {
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numberOfCredentials++;
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}
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break;
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}
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}
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}
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else {
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if (credential_verify(allowList[e].id.data, allowList[e].id.len, rp_id_hash, true) == 0) {
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numberOfCredentials++;
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}
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}
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}
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}
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if (numberOfCredentials == 0) {
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CBOR_ERROR(CTAP2_ERR_NO_CREDENTIALS);
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}
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}
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if (!silent) {
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for (int i = 0; i < numberOfCredentials; i++) {
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for (int j = i + 1; j < numberOfCredentials; j++) {
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if (creds[j].creation > creds[i].creation) {
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Credential tmp = creds[j];
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creds[j] = creds[i];
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creds[i] = tmp;
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}
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}
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}
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}
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if (options.up == ptrue || options.present == false || options.up == NULL) { //9.1
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if (pinUvAuthParam.present == true) {
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if (getUserPresentFlagValue() == false) {
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if (check_user_presence() == false) {
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CBOR_ERROR(CTAP2_ERR_OPERATION_DENIED);
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}
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}
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}
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else {
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if (!(flags & FIDO2_AUT_FLAG_UP)) {
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if (check_user_presence() == false) {
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CBOR_ERROR(CTAP2_ERR_OPERATION_DENIED);
|
|
}
|
|
}
|
|
}
|
|
flags |= FIDO2_AUT_FLAG_UP;
|
|
clearUserPresentFlag();
|
|
clearUserVerifiedFlag();
|
|
clearPinUvAuthTokenPermissionsExceptLbw();
|
|
}
|
|
|
|
if (extensions.largeBlobKey == pfalse) {
|
|
CBOR_ERROR(CTAP2_ERR_INVALID_OPTION);
|
|
}
|
|
|
|
if (silent && !resident) {
|
|
// Silent authentication, do nothing
|
|
}
|
|
else {
|
|
selcred = &creds[0];
|
|
if (resident && allowList_len > 1) {
|
|
numberOfCredentials = 1;
|
|
}
|
|
if (numberOfCredentials > 1) {
|
|
asserted = true;
|
|
residentx = resident;
|
|
for (int i = 0; i < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
|
|
credential_free(&credsx[i]);
|
|
}
|
|
for (int i = 0; i < numberOfCredentials; i++) {
|
|
credsx[i] = creds[i];
|
|
}
|
|
numberOfCredentialsx = numberOfCredentials;
|
|
datax = (uint8_t *) calloc(1, len);
|
|
memcpy(datax, data, len);
|
|
lenx = len;
|
|
flagsx = flags;
|
|
timerx = board_millis();
|
|
credentialCounter = 1;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
resident = residentx;
|
|
numberOfCredentials = numberOfCredentialsx;
|
|
flags = flagsx;
|
|
selcred = &credsx[credentialCounter];
|
|
}
|
|
|
|
int ret = 0;
|
|
uint8_t largeBlobKey[32] = {0};
|
|
if (selcred) {
|
|
if (extensions.largeBlobKey == ptrue && selcred->extensions.largeBlobKey == ptrue) {
|
|
ret = credential_derive_large_blob_key(selcred->id.data, selcred->id.len, largeBlobKey);
|
|
if (ret != 0) {
|
|
CBOR_ERROR(CTAP2_ERR_PROCESSING);
|
|
}
|
|
}
|
|
}
|
|
|
|
size_t ext_len = 0;
|
|
uint8_t ext[512] = {0};
|
|
if (selcred && extensions.present == true) {
|
|
cbor_encoder_init(&encoder, ext, sizeof(ext), 0);
|
|
int l = 0;
|
|
if (options.up == pfalse) {
|
|
extensions.hmac_secret = NULL;
|
|
}
|
|
if (extensions.hmac_secret == ptrue) {
|
|
l++;
|
|
}
|
|
if (credBlob == ptrue) {
|
|
l++;
|
|
}
|
|
if (extensions.thirdPartyPayment == ptrue) {
|
|
l++;
|
|
}
|
|
if (l > 0) {
|
|
CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, l));
|
|
if (credBlob == ptrue) {
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder, "credBlob"));
|
|
if (selcred->extensions.credBlob.present == true) {
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, selcred->extensions.credBlob.data,
|
|
selcred->extensions.credBlob.len));
|
|
}
|
|
else {
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, NULL, 0));
|
|
}
|
|
}
|
|
if (extensions.hmac_secret == ptrue) {
|
|
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder, "hmac-secret"));
|
|
|
|
uint8_t sharedSecret[64] = {0};
|
|
mbedtls_ecp_point Qp;
|
|
mbedtls_ecp_point_init(&Qp);
|
|
mbedtls_mpi_lset(&Qp.Z, 1);
|
|
if (mbedtls_mpi_read_binary(&Qp.X, kax.data, kax.len) != 0) {
|
|
mbedtls_ecp_point_free(&Qp);
|
|
CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
|
|
}
|
|
if (mbedtls_mpi_read_binary(&Qp.Y, kay.data, kay.len) != 0) {
|
|
mbedtls_ecp_point_free(&Qp);
|
|
CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
|
|
}
|
|
ret = ecdh((uint8_t)hmacSecretPinUvAuthProtocol, &Qp, sharedSecret);
|
|
mbedtls_ecp_point_free(&Qp);
|
|
if (ret != 0) {
|
|
mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
|
|
CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
|
|
}
|
|
if (verify((uint8_t)hmacSecretPinUvAuthProtocol, sharedSecret, salt_enc.data, (uint16_t)salt_enc.len, salt_auth.data) != 0) {
|
|
mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
|
|
CBOR_ERROR(CTAP2_ERR_EXTENSION_FIRST);
|
|
}
|
|
uint8_t salt_dec[64] = {0}, poff = ((uint8_t)hmacSecretPinUvAuthProtocol - 1) * IV_SIZE;
|
|
ret = decrypt((uint8_t)hmacSecretPinUvAuthProtocol, sharedSecret, salt_enc.data, (uint16_t)salt_enc.len, salt_dec);
|
|
if (ret != 0) {
|
|
mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
|
|
CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
|
|
}
|
|
uint8_t cred_random[64] = {0}, *crd = NULL;
|
|
ret = credential_derive_hmac_key(selcred->id.data, selcred->id.len, cred_random);
|
|
if (ret != 0) {
|
|
mbedtls_platform_zeroize(sharedSecret, sizeof(sharedSecret));
|
|
CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
|
|
}
|
|
if (flags & FIDO2_AUT_FLAG_UV) {
|
|
crd = cred_random + 32;
|
|
}
|
|
else {
|
|
crd = cred_random;
|
|
}
|
|
uint8_t out1[64] = {0}, hmac_res[80] = {0};
|
|
mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), crd, 32, salt_dec, 32, out1);
|
|
if ((uint8_t)salt_enc.len == 64 + poff) {
|
|
mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), crd, 32, salt_dec + 32, 32, out1 + 32);
|
|
}
|
|
encrypt((uint8_t)hmacSecretPinUvAuthProtocol, sharedSecret, out1, (uint16_t)(salt_enc.len - poff), hmac_res);
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, hmac_res, salt_enc.len));
|
|
}
|
|
if (extensions.thirdPartyPayment == ptrue) {
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder, "thirdPartyPayment"));
|
|
if (selcred->extensions.thirdPartyPayment == ptrue) {
|
|
CBOR_CHECK(cbor_encode_boolean(&mapEncoder, true));
|
|
}
|
|
else {
|
|
CBOR_CHECK(cbor_encode_boolean(&mapEncoder, false));
|
|
}
|
|
}
|
|
|
|
CBOR_CHECK(cbor_encoder_close_container(&encoder, &mapEncoder));
|
|
ext_len = cbor_encoder_get_buffer_size(&encoder, ext);
|
|
flags |= FIDO2_AUT_FLAG_ED;
|
|
}
|
|
}
|
|
|
|
uint32_t ctr = get_sign_counter();
|
|
|
|
size_t aut_data_len = 32 + 1 + 4 + ext_len;
|
|
aut_data = (uint8_t *) calloc(1, aut_data_len + clientDataHash.len);
|
|
uint8_t *pa = aut_data;
|
|
memcpy(pa, rp_id_hash, 32); pa += 32;
|
|
*pa++ = flags;
|
|
pa += put_uint32_t_be(ctr, pa);
|
|
memcpy(pa, ext, ext_len); pa += ext_len;
|
|
if ((size_t)(pa - aut_data) != aut_data_len) {
|
|
CBOR_ERROR(CTAP1_ERR_OTHER);
|
|
}
|
|
|
|
memcpy(pa, clientDataHash.data, clientDataHash.len);
|
|
uint8_t hash[64] = {0}, sig[MBEDTLS_ECDSA_MAX_LEN] = {0};
|
|
const mbedtls_md_info_t *md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
|
|
mbedtls_ecp_keypair ekey;
|
|
mbedtls_ecp_keypair_init(&ekey);
|
|
size_t olen = 0;
|
|
if (selcred) {
|
|
ret = fido_load_key((int)selcred->curve, selcred->id.data, &ekey);
|
|
if (ret != 0) {
|
|
if (derive_key(rp_id_hash, false, selcred->id.data, MBEDTLS_ECP_DP_SECP256R1, &ekey) != 0) {
|
|
mbedtls_ecp_keypair_free(&ekey);
|
|
CBOR_ERROR(CTAP1_ERR_OTHER);
|
|
}
|
|
}
|
|
if (ekey.grp.id == MBEDTLS_ECP_DP_SECP384R1) {
|
|
md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA384);
|
|
}
|
|
else if (ekey.grp.id == MBEDTLS_ECP_DP_SECP521R1) {
|
|
md = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
|
|
}
|
|
#ifdef MBEDTLS_EDDSA_C
|
|
else if (ekey.grp.id == MBEDTLS_ECP_DP_ED25519) {
|
|
md = NULL;
|
|
}
|
|
#endif
|
|
if (md != NULL) {
|
|
ret = mbedtls_md(md, aut_data, aut_data_len + clientDataHash.len, hash);
|
|
ret = mbedtls_ecdsa_write_signature(&ekey, mbedtls_md_get_type(md), hash, mbedtls_md_get_size(md), sig, sizeof(sig), &olen, random_gen, NULL);
|
|
}
|
|
#ifdef MBEDTLS_EDDSA_C
|
|
else {
|
|
ret = mbedtls_eddsa_write_signature(&ekey, aut_data, aut_data_len + clientDataHash.len, sig, sizeof(sig), &olen, MBEDTLS_EDDSA_PURE, NULL, 0, random_gen, NULL);
|
|
}
|
|
#endif
|
|
}
|
|
else {
|
|
// Bogus signature
|
|
olen = 64;
|
|
memset(sig, 0x0B, olen);
|
|
}
|
|
mbedtls_ecp_keypair_free(&ekey);
|
|
if (ret != 0) {
|
|
CBOR_ERROR(CTAP2_ERR_PROCESSING);
|
|
}
|
|
|
|
uint8_t lfields = 3;
|
|
if (selcred && selcred->opts.present == true && selcred->opts.rk == ptrue) {
|
|
lfields++;
|
|
}
|
|
if (numberOfCredentials > 1 && next == false && (!resident || allowList_len <= 1)) {
|
|
lfields++;
|
|
}
|
|
if (selcred && extensions.largeBlobKey == ptrue && selcred->extensions.largeBlobKey == ptrue) {
|
|
lfields++;
|
|
}
|
|
cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
|
|
CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, lfields));
|
|
|
|
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x01));
|
|
CBOR_CHECK(cbor_encoder_create_map(&mapEncoder, &mapEncoder2, 2));
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "id"));
|
|
if (selcred) {
|
|
if (resident) {
|
|
uint8_t cred_idr[CRED_RESIDENT_LEN] = {0};
|
|
credential_derive_resident(selcred->id.data, selcred->id.len, cred_idr);
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, cred_idr, sizeof(cred_idr)));
|
|
}
|
|
else {
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, selcred->id.data, selcred->id.len));
|
|
}
|
|
}
|
|
else {
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, (uint8_t *)"\x00\x01\x00\x01\x00\x01\x00\x01\x00\x01\x00\x01\x00\x01\x00\x01", 16));
|
|
}
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "type"));
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "public-key"));
|
|
CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &mapEncoder2));
|
|
|
|
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x02));
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, aut_data, aut_data_len));
|
|
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x03));
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, sig, olen));
|
|
|
|
if (selcred && selcred->opts.present == true && selcred->opts.rk == ptrue) {
|
|
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x04));
|
|
uint8_t lu = 1;
|
|
if (numberOfCredentials > 1 && allowList_len == 0) {
|
|
if (selcred->userName.present == true) {
|
|
lu++;
|
|
}
|
|
if (selcred->userDisplayName.present == true) {
|
|
lu++;
|
|
}
|
|
}
|
|
CBOR_CHECK(cbor_encoder_create_map(&mapEncoder, &mapEncoder2, lu));
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "id"));
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, selcred->userId.data, selcred->userId.len));
|
|
if (numberOfCredentials > 1 && allowList_len == 0) {
|
|
if (selcred->userName.present == true) {
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "name"));
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, selcred->userName.data));
|
|
}
|
|
if (selcred->userDisplayName.present == true) {
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "displayName"));
|
|
CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, selcred->userDisplayName.data));
|
|
}
|
|
}
|
|
CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &mapEncoder2));
|
|
}
|
|
if (numberOfCredentials > 1 && next == false && (!resident || allowList_len <= 1)) {
|
|
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x05));
|
|
CBOR_CHECK(cbor_encode_uint(&mapEncoder, numberOfCredentials));
|
|
}
|
|
if (selcred && extensions.largeBlobKey == ptrue && selcred->extensions.largeBlobKey == ptrue) {
|
|
CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x07));
|
|
CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, largeBlobKey, sizeof(largeBlobKey)));
|
|
}
|
|
mbedtls_platform_zeroize(largeBlobKey, sizeof(largeBlobKey));
|
|
CBOR_CHECK(cbor_encoder_close_container(&encoder, &mapEncoder));
|
|
resp_size = cbor_encoder_get_buffer_size(&encoder, ctap_resp->init.data + 1);
|
|
ctr++;
|
|
file_put_data(ef_counter, (uint8_t *) &ctr, sizeof(ctr));
|
|
low_flash_available();
|
|
err:
|
|
CBOR_FREE_BYTE_STRING(clientDataHash);
|
|
CBOR_FREE_BYTE_STRING(pinUvAuthParam);
|
|
CBOR_FREE_BYTE_STRING(rpId);
|
|
CBOR_FREE_BYTE_STRING(kax);
|
|
CBOR_FREE_BYTE_STRING(kay);
|
|
CBOR_FREE_BYTE_STRING(salt_enc);
|
|
CBOR_FREE_BYTE_STRING(salt_auth);
|
|
if (asserted == false) {
|
|
for (int i = 0; i < MAX_CREDENTIAL_COUNT_IN_LIST; i++) {
|
|
credential_free(&creds[i]);
|
|
}
|
|
}
|
|
|
|
for (size_t m = 0; m < MAX_CREDENTIAL_COUNT_IN_LIST; m++) {
|
|
CBOR_FREE_BYTE_STRING(allowList[m].type);
|
|
CBOR_FREE_BYTE_STRING(allowList[m].id);
|
|
for (size_t n = 0; n < 8; n++) {
|
|
CBOR_FREE_BYTE_STRING(allowList[m].transports[n]);
|
|
}
|
|
}
|
|
if (aut_data) {
|
|
free(aut_data);
|
|
}
|
|
if (error != CborNoError) {
|
|
if (error == CborErrorImproperValue) {
|
|
return CTAP2_ERR_CBOR_UNEXPECTED_TYPE;
|
|
}
|
|
return error;
|
|
}
|
|
res_APDU_size = (uint16_t)resp_size;
|
|
return 0;
|
|
}
|