e5ca759dea
It coexists with FIDO app via HID interface. Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
246 lines
7.9 KiB
C
246 lines
7.9 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 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "common.h"
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#include "fido.h"
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#include "hsm.h"
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#include "apdu.h"
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#include "ctap.h"
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#include "files.h"
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#include "file.h"
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#include "usb.h"
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#include "random.h"
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#include "bsp/board.h"
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#include "mbedtls/ecdsa.h"
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#include "mbedtls/x509_crt.h"
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#include "mbedtls/hkdf.h"
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#include "pk_wrap.h"
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#include "crypto_utils.h"
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#include "ccid.h"
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#include "version.h"
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#include "asn1.h"
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#include <stdio.h>
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#define MAX_OATH_CRED 255
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#define CHALLENGE_LEN 8
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#define TAG_NAME 0x71
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#define TAG_NAME_LIST 0x72
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#define TAG_KEY 0x73
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#define TAG_CHALLENGE 0x74
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#define TAG_RESPONSE 0x75
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#define TAG_T_RESPONSE 0x76
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#define TAG_NO_RESPONSE 0x77
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#define TAG_PROPERTY 0x78
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#define TAG_VERSION 0x79
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#define TAG_IMF 0x7a
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#define TAG_ALGO 0x7b
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#define TAG_TOUCH_RESPONSE 0x7c
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#define ALG_HMAC_SHA1 0x01
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#define ALG_HMAC_SHA256 0x02
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#define ALG_HMAC_SHA512 0x03
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#define ALG_MASK 0x0f
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#define OATH_TYPE_HOTP 0x10
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#define OATH_TYPE_TOTP 0x20
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#define OATH_TYPE_MASK 0xf0
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#define PROP_INC 0x01
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#define PROP_TOUCH 0x02
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int oath_process_apdu();
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int oath_unload();
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static bool validated = true;
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static uint8_t challenge[CHALLENGE_LEN] = {0};
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const uint8_t oath_aid[] = {
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7,
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0xa0, 0x00, 0x00, 0x05, 0x27, 0x21, 0x01
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};
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app_t *oath_select(app_t *a, const uint8_t *aid, uint8_t aid_len) {
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if (!memcmp(aid, oath_aid+1, MIN(aid_len,oath_aid[0]))) {
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a->aid = oath_aid;
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a->process_apdu = oath_process_apdu;
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a->unload = oath_unload;
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res_APDU_size = 0;
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res_APDU[res_APDU_size++] = TAG_VERSION;
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res_APDU[res_APDU_size++] = 2;
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res_APDU[res_APDU_size++] = PICO_FIDO_VERSION_MAJOR;
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res_APDU[res_APDU_size++] = PICO_FIDO_VERSION_MINOR;
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res_APDU[res_APDU_size++] = TAG_NAME;
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res_APDU[res_APDU_size++] = 9;
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memcpy(res_APDU+res_APDU_size, (const uint8_t *)"Pico Fido", 9); res_APDU_size += 9;
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pico_get_unique_board_id((pico_unique_board_id_t *)(res_APDU+res_APDU_size)); res_APDU_size += 8;
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if (file_has_data(search_dynamic_file(EF_OATH_CODE)) == true) {
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res_APDU[res_APDU_size++] = TAG_CHALLENGE;
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res_APDU[res_APDU_size++] = sizeof(challenge);
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memcpy(res_APDU+res_APDU_size, challenge, sizeof(challenge)); res_APDU_size += sizeof(challenge);
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}
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return a;
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}
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return NULL;
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}
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void __attribute__ ((constructor)) oath_ctor() {
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register_app(oath_select);
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}
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int oath_unload() {
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return CCID_OK;
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}
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int cmd_put() {
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if (validated == false)
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return SW_SECURITY_STATUS_NOT_SATISFIED();
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for (int i = 0; i < MAX_OATH_CRED; i++) {
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file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
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if (!file_has_data(ef)) {
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ef = file_new(EF_OATH_CRED + i);
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flash_write_data_to_file(ef, apdu.data, apdu.nc);
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low_flash_available();
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return SW_OK();
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}
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}
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return SW_FILE_FULL();
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}
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int cmd_delete() {
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size_t tag_len = 0, ef_tag_len = 0;
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uint8_t *tag_data = NULL, *ef_tag_data = NULL;
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if (validated == false)
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return SW_SECURITY_STATUS_NOT_SATISFIED();
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if (asn1_find_tag(apdu.data, apdu.nc, TAG_NAME, &tag_len, &tag_data) == true) {
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for (int i = 0; i < MAX_OATH_CRED; i++) {
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file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
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if (file_has_data(ef) && asn1_find_tag(file_get_data(ef), file_get_size(ef), TAG_NAME, &ef_tag_len, &ef_tag_data) == true && ef_tag_len == tag_len && memcmp(ef_tag_data, tag_data, tag_len) == 0) {
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delete_file(ef);
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return SW_OK();
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}
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}
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return SW_DATA_INVALID();
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}
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return SW_INCORRECT_PARAMS();
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}
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int cmd_set_code() {
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if (validated == false)
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return SW_SECURITY_STATUS_NOT_SATISFIED();
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if (apdu.nc == 0) {
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delete_file(search_dynamic_file(EF_OATH_CODE));
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validated = true;
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return SW_OK();
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}
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size_t key_len = 0, chal_len = 0, resp_len = 0;
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uint8_t *key = NULL, *chal = NULL, *resp = NULL;
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if (asn1_find_tag(apdu.data, apdu.nc, TAG_KEY, &key_len, &key) == false)
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return SW_INCORRECT_PARAMS();
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if (key_len == 0) {
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delete_file(search_dynamic_file(EF_OATH_CODE));
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validated = true;
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return SW_OK();
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}
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if (asn1_find_tag(apdu.data, apdu.nc, TAG_CHALLENGE, &chal_len, &chal) == false)
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return SW_INCORRECT_PARAMS();
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if (asn1_find_tag(apdu.data, apdu.nc, TAG_RESPONSE, &resp_len, &resp) == false)
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return SW_INCORRECT_PARAMS();
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const mbedtls_md_info_t *md_info = NULL;
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if ((key[0] & ALG_MASK) == ALG_HMAC_SHA1)
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md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1);
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else if ((key[0] & ALG_MASK) == ALG_HMAC_SHA256)
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md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
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else if ((key[0] & ALG_MASK) == ALG_HMAC_SHA512)
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md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA512);
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uint8_t hmac[64];
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int r = mbedtls_md_hmac(md_info, key+1, key_len-1, chal, chal_len, hmac);
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if (r != 0)
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return SW_EXEC_ERROR();
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if (memcmp(hmac, resp, resp_len) != 0)
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return SW_DATA_INVALID();
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random_gen(NULL, challenge, sizeof(challenge));
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file_t *ef = file_new(EF_OATH_CODE);
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flash_write_data_to_file(ef, key, key_len);
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low_flash_available();
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validated = false;
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return SW_OK();
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}
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int cmd_reset() {
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for (int i = 0; i < MAX_OATH_CRED; i++) {
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file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
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if (file_has_data(ef)) {
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delete_file(ef);
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}
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}
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delete_file(search_dynamic_file(EF_OATH_CODE));
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validated = true;
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return SW_OK();
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}
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int cmd_list() {
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size_t name_len = 0, key_len = 0;
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uint8_t *name = NULL, *key = NULL;
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for (int i = 0; i < MAX_OATH_CRED; i++) {
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file_t *ef = search_dynamic_file(EF_OATH_CRED + i);
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if (file_has_data(ef)) {
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uint8_t *data = file_get_data(ef);
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size_t data_len = file_get_size(ef);
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if (asn1_find_tag(data, data_len, TAG_NAME, &name_len, &name) == true && asn1_find_tag(data, data_len, TAG_KEY, &key_len, &key) == true) {
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res_APDU[res_APDU_size++] = TAG_NAME_LIST;
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res_APDU[res_APDU_size++] = name_len + 1;
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res_APDU[res_APDU_size++] = key[0];
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memcpy(res_APDU+res_APDU_size, name, name_len);
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}
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}
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}
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return SW_OK();
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}
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#define INS_PUT 0x01
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#define INS_DELETE 0x02
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#define INS_SET_CODE 0x03
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#define INS_RESET 0x04
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#define INS_LIST 0xa1
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#define INS_CALCULATE 0xa2
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#define INS_VALIDATE 0xa3
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#define INS_CALC_ALL 0xa4
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#define INS_SEND_REMAINING 0xa5
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static const cmd_t cmds[] = {
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{ INS_PUT, cmd_put },
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{ INS_DELETE, cmd_delete },
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{ INS_SET_CODE, cmd_set_code },
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{ INS_RESET, cmd_reset },
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{ INS_LIST, cmd_list },
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{ 0x00, 0x0}
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};
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int oath_process_apdu() {
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if (CLA(apdu) != 0x00)
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return SW_CLA_NOT_SUPPORTED();
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for (const cmd_t *cmd = cmds; cmd->ins != 0x00; cmd++)
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{
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if (cmd->ins == INS(apdu)) {
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int r = cmd->cmd_handler();
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return r;
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}
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}
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return SW_INS_NOT_SUPPORTED();
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}
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