473 lines
20 KiB
C
473 lines
20 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 "fido.h"
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#include "ctap.h"
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#include "hid/ctap_hid.h"
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#include "cbor_make_credential.h"
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#include "files.h"
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#include "apdu.h"
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#include "credential.h"
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uint8_t rp_counter = 1;
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uint8_t rp_total = 0;
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uint8_t cred_counter = 1;
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uint8_t cred_total = 0;
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CborByteString rpIdHashx = { 0 };
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int cbor_cred_mgmt(const uint8_t *data, size_t len) {
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CborParser parser;
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CborValue map;
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CborError error = CborNoError;
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uint64_t subcommand = 0, pinUvAuthProtocol = 0;
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CborByteString pinUvAuthParam = { 0 }, rpIdHash = { 0 };
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PublicKeyCredentialDescriptor credentialId = { 0 };
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PublicKeyCredentialUserEntity user = { 0 };
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size_t resp_size = 0;
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CborEncoder encoder, mapEncoder, mapEncoder2;
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uint8_t *raw_subpara = NULL;
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size_t raw_subpara_len = 0;
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bool asserted = false, is_preview = *(data - 1) == 0x41; // Backwards compatibility
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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 <= 1 && 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_UINT(subcommand, 1);
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}
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else if (val_u == 0x02) {
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uint64_t subpara = 0;
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raw_subpara = (uint8_t *) cbor_value_get_next_byte(&_f1);
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CBOR_PARSE_MAP_START(_f1, 2)
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{
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CBOR_FIELD_GET_UINT(subpara, 2);
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if (subpara == 0x01) {
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CBOR_FIELD_GET_BYTES(rpIdHash, 2);
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}
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else if (subpara == 0x02) {
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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", credentialId.id);
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CBOR_FIELD_KEY_TEXT_VAL_TEXT(3, "type", credentialId.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(credentialId.transports[credentialId.transports_len], 4);
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credentialId.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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}
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else if (subpara == 0x03) {
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CBOR_PARSE_MAP_START(_f1, 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", user.id);
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CBOR_FIELD_KEY_TEXT_VAL_TEXT(3, "name", user.parent.name);
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CBOR_FIELD_KEY_TEXT_VAL_TEXT(3, "displayName", user.displayName);
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}
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CBOR_PARSE_MAP_END(_f1, 3);
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}
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}
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CBOR_PARSE_MAP_END(_f1, 2);
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raw_subpara_len = cbor_value_get_next_byte(&_f1) - raw_subpara;
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}
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else if (val_u == 0x03) {
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CBOR_FIELD_GET_UINT(pinUvAuthProtocol, 1);
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}
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else if (val_u == 0x04) { // pubKeyCredParams
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CBOR_FIELD_GET_BYTES(pinUvAuthParam, 1);
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}
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}
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CBOR_PARSE_MAP_END(map, 1);
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if (subcommand != 0x03 && subcommand != 0x05) {
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if (pinUvAuthParam.present == false) {
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CBOR_ERROR(CTAP2_ERR_PUAT_REQUIRED);
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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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cbor_encoder_init(&encoder, ctap_resp->init.data + 1, CTAP_MAX_CBOR_PAYLOAD, 0);
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if (subcommand == 0x01) {
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if (verify((uint8_t)pinUvAuthProtocol, ppaut.data, (const uint8_t *) "\x01", 1, pinUvAuthParam.data) == CborNoError) {
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if (!(ppaut.permissions & CTAP_PERMISSION_PCMR)) {
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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 (verify((uint8_t)pinUvAuthProtocol, paut.data, (const uint8_t *) "\x01", 1, pinUvAuthParam.data) != CborNoError) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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if (is_preview == false &&
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(!(paut.permissions & CTAP_PERMISSION_CM) || paut.has_rp_id == true)) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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}
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uint8_t existing = 0;
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
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if (file_has_data(search_dynamic_file((uint16_t)(EF_CRED + i)))) {
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existing++;
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}
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}
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CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, 2));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x01));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, existing));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x02));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, MAX_RESIDENT_CREDENTIALS - existing));
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}
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else if (subcommand == 0x02 || subcommand == 0x03) {
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file_t *rp_ef = NULL;
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if (subcommand == 0x02) {
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if (verify((uint8_t)pinUvAuthProtocol, ppaut.data, (const uint8_t *) "\x02", 1, pinUvAuthParam.data) == CborNoError) {
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if (!(ppaut.permissions & CTAP_PERMISSION_PCMR)) {
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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 (verify((uint8_t)pinUvAuthProtocol, paut.data, (const uint8_t *) "\x02", 1, pinUvAuthParam.data) != CborNoError) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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if (is_preview == false && (!(paut.permissions & CTAP_PERMISSION_CM) || paut.has_rp_id == true)) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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}
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rp_counter = 1;
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rp_total = 0;
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}
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else {
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if (rp_counter > rp_total) {
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CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
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}
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}
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uint8_t skip = 0;
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
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file_t *tef = search_dynamic_file((uint16_t)(EF_RP + i));
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if (file_has_data(tef) && *file_get_data(tef) > 0) {
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if (++skip == rp_counter) {
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if (rp_ef == NULL) {
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rp_ef = tef;
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}
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if (subcommand == 0x03) {
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break;
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}
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}
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if (subcommand == 0x02) {
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rp_total++;
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}
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}
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}
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if (rp_ef == NULL) {
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CBOR_ERROR(CTAP2_ERR_NO_CREDENTIALS);
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}
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rp_counter++;
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CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, subcommand == 0x02 ? 3 : 2));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x03));
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CBOR_CHECK(cbor_encoder_create_map(&mapEncoder, &mapEncoder2, 1));
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CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "id"));
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CBOR_CHECK(cbor_encode_text_string(&mapEncoder2, (char *) file_get_data(rp_ef) + 33,
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file_get_size(rp_ef) - 33));
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CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &mapEncoder2));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x04));
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CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, file_get_data(rp_ef) + 1, 32));
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if (subcommand == 0x02) {
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x05));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, rp_total));
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}
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}
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else if (subcommand == 0x04 || subcommand == 0x05) {
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if (subcommand == 0x04 && rpIdHash.present == false) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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if (subcommand == 0x04) {
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*(raw_subpara - 1) = 0x04;
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if (verify((uint8_t)pinUvAuthProtocol, ppaut.data, raw_subpara - 1, (uint16_t)(raw_subpara_len + 1), pinUvAuthParam.data) == CborNoError) {
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if (!(ppaut.permissions & CTAP_PERMISSION_PCMR)) {
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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 (verify((uint8_t)pinUvAuthProtocol, paut.data, raw_subpara - 1, (uint16_t)(raw_subpara_len + 1), pinUvAuthParam.data) != CborNoError) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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if (is_preview == false &&
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(!(paut.permissions & CTAP_PERMISSION_CM) ||
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(paut.has_rp_id == true && memcmp(paut.rp_id_hash, rpIdHash.data, 32) != 0))) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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}
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cred_counter = 1;
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cred_total = 0;
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}
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else {
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if (cred_counter > cred_total) {
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CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
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}
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rpIdHash = rpIdHashx;
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}
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file_t *cred_ef = NULL;
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uint8_t skip = 0;
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
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file_t *tef = search_dynamic_file((uint16_t)(EF_CRED + i));
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if (file_has_data(tef) && memcmp(file_get_data(tef), rpIdHash.data, 32) == 0) {
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if (++skip == cred_counter) {
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if (cred_ef == NULL) {
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cred_ef = tef;
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}
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if (subcommand == 0x05) {
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break;
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}
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}
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if (subcommand == 0x04) {
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cred_total++;
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}
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}
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}
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if (!file_has_data(cred_ef)) {
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CBOR_ERROR(CTAP2_ERR_NO_CREDENTIALS);
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}
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Credential cred = { 0 };
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if (credential_load_resident(cred_ef, rpIdHash.data, &cred) != 0) {
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CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
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}
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mbedtls_ecp_keypair key;
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mbedtls_ecp_keypair_init(&key);
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if (fido_load_key((int)cred.curve, cred.id.data, &key) != 0) {
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credential_free(&cred);
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mbedtls_ecp_keypair_free(&key);
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CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
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}
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cred_counter++;
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uint8_t l = 4;
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if (subcommand == 0x04) {
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l++;
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}
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if (cred.extensions.present == true) {
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if (cred.extensions.credProtect > 0) {
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l++;
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}
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if (cred.extensions.largeBlobKey == ptrue) {
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l++;
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}
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}
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CBOR_CHECK(cbor_encoder_create_map(&encoder, &mapEncoder, l));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x06));
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l = 0;
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if (cred.userId.present == true) {
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l++;
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}
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if (cred.userName.present == true) {
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l++;
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}
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if (cred.userDisplayName.present == true) {
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l++;
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}
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CBOR_CHECK(cbor_encoder_create_map(&mapEncoder, &mapEncoder2, l));
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if (cred.userId.present == true) {
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CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "id"));
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CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, cred.userId.data, cred.userId.len));
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}
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if (cred.userName.present == true) {
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CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "name"));
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CBOR_CHECK(cbor_encode_text_string(&mapEncoder2, cred.userName.data, cred.userName.len));
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}
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if (cred.userDisplayName.present == true) {
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CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "displayName"));
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CBOR_CHECK(cbor_encode_text_string(&mapEncoder2, cred.userDisplayName.data, cred.userDisplayName.len));
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}
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CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &mapEncoder2));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x07));
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CBOR_CHECK(cbor_encoder_create_map(&mapEncoder, &mapEncoder2, 2));
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CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "id"));
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uint8_t cred_idr[CRED_RESIDENT_LEN] = {0};
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credential_derive_resident(cred.id.data, cred.id.len, cred_idr);
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CBOR_CHECK(cbor_encode_byte_string(&mapEncoder2, cred_idr, sizeof(cred_idr)));
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CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "type"));
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CBOR_CHECK(cbor_encode_text_stringz(&mapEncoder2, "public-key"));
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CBOR_CHECK(cbor_encoder_close_container(&mapEncoder, &mapEncoder2));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x08));
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CBOR_CHECK(COSE_key(&key, &mapEncoder, &mapEncoder2));
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if (subcommand == 0x04) {
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x09));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, cred_total));
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}
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if (cred_counter <= cred_total) {
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asserted = true;
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rpIdHashx = rpIdHash;
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}
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if (cred.extensions.present == true) {
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if (cred.extensions.credProtect > 0) {
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0A));
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, cred.extensions.credProtect));
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}
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if (cred.extensions.largeBlobKey == ptrue) {
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uint8_t largeBlobKey[32];
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int ret = credential_derive_large_blob_key(cred.id.data, cred.id.len, largeBlobKey);
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if (ret != 0) {
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CBOR_ERROR(CTAP2_ERR_PROCESSING);
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}
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0B));
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CBOR_CHECK(cbor_encode_byte_string(&mapEncoder, largeBlobKey, sizeof(largeBlobKey)));
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mbedtls_platform_zeroize(largeBlobKey, sizeof(largeBlobKey));
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}
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0C));
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CBOR_CHECK(cbor_encode_boolean(&mapEncoder, cred.extensions.thirdPartyPayment == ptrue));
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}
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else {
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CBOR_CHECK(cbor_encode_uint(&mapEncoder, 0x0C));
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CBOR_CHECK(cbor_encode_boolean(&mapEncoder, false));
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}
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credential_free(&cred);
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mbedtls_ecp_keypair_free(&key);
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}
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else if (subcommand == 0x06) {
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if (credentialId.id.present == false) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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*(raw_subpara - 1) = 0x06;
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if (verify((uint8_t)pinUvAuthProtocol, paut.data, raw_subpara - 1, (uint16_t)(raw_subpara_len + 1), pinUvAuthParam.data) != CborNoError) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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if (is_preview == false &&
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(!(paut.permissions & CTAP_PERMISSION_CM) ||
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(paut.has_rp_id == true && memcmp(paut.rp_id_hash, rpIdHash.data, 32) != 0))) {
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CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
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}
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for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; 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) + 32, credentialId.id.data, CRED_RESIDENT_LEN) == 0) {
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uint8_t *rp_id_hash = file_get_data(ef);
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if (delete_file(ef) != 0) {
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CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
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}
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for (int j = 0; j < MAX_RESIDENT_CREDENTIALS; j++) {
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file_t *rp_ef = search_dynamic_file((uint16_t)(EF_RP + j));
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if (file_has_data(rp_ef) && memcmp(file_get_data(rp_ef) + 1, rp_id_hash, 32) == 0) {
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uint8_t *rp_data = (uint8_t *) calloc(1, file_get_size(rp_ef));
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memcpy(rp_data, file_get_data(rp_ef), file_get_size(rp_ef));
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rp_data[0] -= 1;
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if (rp_data[0] == 0) {
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delete_file(rp_ef);
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}
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else {
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file_put_data(rp_ef, rp_data, file_get_size(rp_ef));
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}
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free(rp_data);
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break;
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}
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}
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low_flash_available();
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goto err; //no error
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}
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}
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CBOR_ERROR(CTAP2_ERR_NO_CREDENTIALS);
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}
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else if (subcommand == 0x07) {
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if (credentialId.id.present == false || user.id.present == false) {
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CBOR_ERROR(CTAP2_ERR_MISSING_PARAMETER);
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}
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*(raw_subpara - 1) = 0x07;
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if (verify((uint8_t)pinUvAuthProtocol, paut.data, raw_subpara - 1, (uint16_t)(raw_subpara_len + 1), pinUvAuthParam.data) != CborNoError) {
|
|
CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
|
|
}
|
|
if (is_preview == false &&
|
|
(!(paut.permissions & CTAP_PERMISSION_CM) ||
|
|
(paut.has_rp_id == true && memcmp(paut.rp_id_hash, rpIdHash.data, 32) != 0))) {
|
|
CBOR_ERROR(CTAP2_ERR_PIN_AUTH_INVALID);
|
|
}
|
|
for (int i = 0; i < MAX_RESIDENT_CREDENTIALS; i++) {
|
|
file_t *ef = search_dynamic_file((uint16_t)(EF_CRED + i));
|
|
if (file_has_data(ef) && memcmp(file_get_data(ef) + 32, credentialId.id.data, CRED_RESIDENT_LEN) == 0) {
|
|
Credential cred = { 0 };
|
|
uint8_t *rp_id_hash = file_get_data(ef);
|
|
if (credential_load_resident(ef, rp_id_hash, &cred) != 0) {
|
|
CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
|
|
}
|
|
if (memcmp(user.id.data, cred.userId.data, MIN(user.id.len, cred.userId.len)) != 0) {
|
|
credential_free(&cred);
|
|
CBOR_ERROR(CTAP1_ERR_INVALID_PARAMETER);
|
|
}
|
|
uint8_t newcred[MAX_CRED_ID_LENGTH];
|
|
uint16_t newcred_len = 0;
|
|
if (credential_create(&cred.rpId, &cred.userId, &user.parent.name,
|
|
&user.displayName, &cred.opts, &cred.extensions,
|
|
cred.use_sign_count, (int)cred.alg,
|
|
(int)cred.curve, newcred, &newcred_len) != 0) {
|
|
credential_free(&cred);
|
|
CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
|
|
}
|
|
credential_free(&cred);
|
|
if (credential_store(newcred, newcred_len, rp_id_hash) != 0) {
|
|
CBOR_ERROR(CTAP2_ERR_NOT_ALLOWED);
|
|
}
|
|
low_flash_available();
|
|
goto err; //no error
|
|
}
|
|
}
|
|
CBOR_ERROR(CTAP2_ERR_NO_CREDENTIALS);
|
|
}
|
|
CBOR_CHECK(cbor_encoder_close_container(&encoder, &mapEncoder));
|
|
resp_size = cbor_encoder_get_buffer_size(&encoder, ctap_resp->init.data + 1);
|
|
err:
|
|
CBOR_FREE_BYTE_STRING(pinUvAuthParam);
|
|
|
|
if (asserted == false) {
|
|
CBOR_FREE_BYTE_STRING(rpIdHash);
|
|
}
|
|
CBOR_FREE_BYTE_STRING(user.id);
|
|
CBOR_FREE_BYTE_STRING(user.displayName);
|
|
CBOR_FREE_BYTE_STRING(user.parent.name);
|
|
CBOR_FREE_BYTE_STRING(credentialId.type);
|
|
CBOR_FREE_BYTE_STRING(credentialId.id);
|
|
for (size_t n = 0; n < credentialId.transports_len; n++) {
|
|
CBOR_FREE_BYTE_STRING(credentialId.transports[n]);
|
|
}
|
|
if (error != CborNoError) {
|
|
if (error == CborErrorImproperValue) {
|
|
return CTAP2_ERR_CBOR_UNEXPECTED_TYPE;
|
|
}
|
|
return error;
|
|
}
|
|
res_APDU_size = (uint16_t)resp_size;
|
|
return 0;
|
|
}
|