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pico-hsm/src/hsm/cmd_extras.c
Pol Henarejos 3c6684cdab
Rename CCID_ codes to PICOKEY_ 
Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
2024-11-05 19:29:00 +01:00

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/*
* This file is part of the Pico HSM distribution (https://github.com/polhenarejos/pico-hsm).
* Copyright (c) 2022 Pol Henarejos.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sc_hsm.h"
#include "mbedtls/ecdh.h"
#ifdef PICO_PLATFORM
#include "pico/aon_timer.h"
#else
#include <sys/time.h>
#include <time.h>
#endif
#include "files.h"
#include "random.h"
#include "kek.h"
#include "mbedtls/hkdf.h"
#include "mbedtls/chachapoly.h"
#ifdef PICO_RP2350
#include "otp.h"
#endif
#define CMD_DATETIME 0xA
#define CMD_DYNOPS 0x6
#define CMD_SECURE_LOCK 0x3A
#define SECURE_LOCK_KEY_AGREEMENT 0x1
#define SECURE_LOCK_ENABLE 0x2
#define SECURE_LOCK_MASK 0x3
#define SECURE_LOCK_DISABLE 0x4
#define CMD_PHY 0x1B
#define CMD_OTP 0x4C
int cmd_extras() {
#ifndef ENABLE_EMULATION
// Only allow change PHY without PIN
if (!isUserAuthenticated && P1(apdu) != 0x1B) {
return SW_SECURITY_STATUS_NOT_SATISFIED();
}
#endif
//check button (if enabled)
if (wait_button_pressed() == true) {
return SW_SECURE_MESSAGE_EXEC_ERROR();
}
if (P1(apdu) == CMD_DATETIME) { //datetime operations
if (P2(apdu) != 0x0) {
return SW_INCORRECT_P1P2();
}
if (apdu.nc == 0) {
#ifdef PICO_PLATFORM
struct timespec tv;
aon_timer_get_time(&tv);
#else
struct timeval tv;
gettimeofday(&tv, NULL);
#endif
struct tm *tm = localtime(&tv.tv_sec);
res_APDU[res_APDU_size++] = (tm->tm_year + 1900) >> 8;
res_APDU[res_APDU_size++] = (tm->tm_year + 1900) & 0xff;
res_APDU[res_APDU_size++] = tm->tm_mon;
res_APDU[res_APDU_size++] = tm->tm_mday;
res_APDU[res_APDU_size++] = tm->tm_wday;
res_APDU[res_APDU_size++] = tm->tm_hour;
res_APDU[res_APDU_size++] = tm->tm_min;
res_APDU[res_APDU_size++] = tm->tm_sec;
}
else {
if (apdu.nc != 8) {
return SW_WRONG_LENGTH();
}
struct tm tm;
tm.tm_year = ((apdu.data[0] << 8) | (apdu.data[1])) - 1900;
tm.tm_mon = apdu.data[2];
tm.tm_mday = apdu.data[3];
tm.tm_wday = apdu.data[4];
tm.tm_hour = apdu.data[5];
tm.tm_min = apdu.data[6];
tm.tm_sec = apdu.data[7];
time_t tv_sec = mktime(&tm);
#ifdef PICO_PLATFORM
struct timespec tv = {.tv_sec = tv_sec, .tv_nsec = 0};
aon_timer_set_time(&tv);
#else
struct timeval tv = {.tv_sec = tv_sec, .tv_usec = 0};
settimeofday(&tv, NULL);
#endif
}
}
else if (P1(apdu) == CMD_DYNOPS) { //dynamic options
if (P2(apdu) != 0x0) {
return SW_INCORRECT_P1P2();
}
if (apdu.nc > sizeof(uint8_t)) {
return SW_WRONG_LENGTH();
}
uint16_t opts = get_device_options();
if (apdu.nc == 0) {
res_APDU[res_APDU_size++] = opts >> 8;
res_APDU[res_APDU_size++] = opts & 0xff;
}
else {
uint8_t newopts[] = { apdu.data[0], (opts & 0xff) };
file_t *tf = search_file(EF_DEVOPS);
file_put_data(tf, newopts, sizeof(newopts));
low_flash_available();
}
}
else if (P1(apdu) == CMD_SECURE_LOCK) { // secure lock
if (apdu.nc == 0) {
return SW_WRONG_LENGTH();
}
if (P2(apdu) == SECURE_LOCK_KEY_AGREEMENT) { // Key Agreement
mbedtls_ecdh_context hkey;
mbedtls_ecdh_init(&hkey);
mbedtls_ecdh_setup(&hkey, MBEDTLS_ECP_DP_SECP256R1);
int ret = mbedtls_ecdh_gen_public(&hkey.ctx.mbed_ecdh.grp, &hkey.ctx.mbed_ecdh.d, &hkey.ctx.mbed_ecdh.Q, random_gen, NULL);
mbedtls_mpi_lset(&hkey.ctx.mbed_ecdh.Qp.Z, 1);
ret = mbedtls_ecp_point_read_binary(&hkey.ctx.mbed_ecdh.grp, &hkey.ctx.mbed_ecdh.Qp, apdu.data, apdu.nc);
if (ret != 0) {
mbedtls_ecdh_free(&hkey);
return SW_WRONG_DATA();
}
memcpy(mse.Qpt, apdu.data, sizeof(mse.Qpt));
uint8_t buf[MBEDTLS_ECP_MAX_BYTES];
size_t olen = 0;
ret = mbedtls_ecdh_calc_secret(&hkey, &olen, buf, MBEDTLS_ECP_MAX_BYTES, random_gen, NULL);
if (ret != 0) {
mbedtls_ecdh_free(&hkey);
mbedtls_platform_zeroize(buf, sizeof(buf));
return SW_WRONG_DATA();
}
ret = mbedtls_hkdf(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), NULL, 0, buf, olen, mse.Qpt, sizeof(mse.Qpt), mse.key_enc, sizeof(mse.key_enc));
mbedtls_platform_zeroize(buf, sizeof(buf));
if (ret != 0) {
mbedtls_ecdh_free(&hkey);
return SW_EXEC_ERROR();
}
ret = mbedtls_ecp_point_write_binary(&hkey.ctx.mbed_ecdh.grp, &hkey.ctx.mbed_ecdh.Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &olen, res_APDU, 4096);
mbedtls_ecdh_free(&hkey);
if (ret != 0) {
return SW_EXEC_ERROR();
}
mse.init = true;
res_APDU_size = (uint16_t)olen;
}
else if (P2(apdu) == SECURE_LOCK_ENABLE || P2(apdu) == SECURE_LOCK_MASK || P2(apdu) == SECURE_LOCK_DISABLE) {
if (mse.init == false) {
return SW_COMMAND_NOT_ALLOWED();
}
int ret = mse_decrypt_ct(apdu.data, apdu.nc);
if (ret != 0) {
return SW_WRONG_DATA();
}
if (P2(apdu) == SECURE_LOCK_ENABLE || P2(apdu) == SECURE_LOCK_DISABLE) { // Enable
uint16_t opts = get_device_options();
uint8_t newopts[] = { opts >> 8, (opts & 0xff) };
if ((P2(apdu) == SECURE_LOCK_ENABLE && !(opts & HSM_OPT_SECURE_LOCK)) ||
(P2(apdu) == SECURE_LOCK_DISABLE && (opts & HSM_OPT_SECURE_LOCK))) {
uint16_t tfids[] = { EF_MKEK, EF_MKEK_SO };
for (int t = 0; t < sizeof(tfids) / sizeof(uint16_t); t++) {
file_t *tf = search_file(tfids[t]);
if (tf) {
uint8_t *tmp = (uint8_t *) calloc(1, file_get_size(tf));
memcpy(tmp, file_get_data(tf), file_get_size(tf));
for (int i = 0; i < MKEK_KEY_SIZE; i++) {
MKEK_KEY(tmp)[i] ^= apdu.data[i];
}
file_put_data(tf, tmp, file_get_size(tf));
free(tmp);
}
}
}
if (P2(apdu) == SECURE_LOCK_ENABLE) {
newopts[0] |= HSM_OPT_SECURE_LOCK >> 8;
}
else if (P2(apdu) == SECURE_LOCK_DISABLE) {
newopts[0] &= ~HSM_OPT_SECURE_LOCK >> 8;
}
file_t *tf = search_file(EF_DEVOPS);
file_put_data(tf, newopts, sizeof(newopts));
low_flash_available();
}
else if (P2(apdu) == SECURE_LOCK_MASK) {
memcpy(mkek_mask, apdu.data, apdu.nc);
has_mkek_mask = true;
}
}
}
#ifndef ENABLE_EMULATION
else if (P1(apdu) == CMD_PHY) { // Set PHY
if (apdu.nc == 0) {
if (file_has_data(ef_phy)) {
res_APDU_size = file_get_size(ef_phy);
memcpy(res_APDU, file_get_data(ef_phy), res_APDU_size);
}
}
else {
if (P2(apdu) == PHY_VIDPID) { // VIDPID
if (apdu.nc != 4) {
return SW_WRONG_LENGTH();
}
phy_data.vid = (apdu.data[0] << 8) | apdu.data[1];
phy_data.pid = (apdu.data[2] << 8) | apdu.data[3];
phy_data.vidpid_present = true;
}
else if (P2(apdu) == PHY_LED_GPIO) {
phy_data.led_gpio = apdu.data[0];
phy_data.led_gpio_present = true;
}
else if (P2(apdu) == PHY_LED_BTNESS) {
phy_data.led_brightness = apdu.data[0];
phy_data.led_brightness_present = true;
}
else if (P2(apdu) == PHY_OPTS) {
if (apdu.nc != 2) {
return SW_WRONG_LENGTH();
}
phy_data.opts = (apdu.data[0] << 8) | apdu.data[1];
}
else {
return SW_INCORRECT_P1P2();
}
uint8_t tmp[PHY_MAX_SIZE];
uint16_t tmp_len = 0;
memset(tmp, 0, sizeof(tmp));
if (phy_serialize_data(&phy_data, tmp, &tmp_len) != PICOKEY_OK) {
return SW_EXEC_ERROR();
}
file_put_data(ef_phy, tmp, tmp_len);
low_flash_available();
}
}
#endif
#if PICO_RP2350
else if (P1(apdu) == CMD_OTP) {
if (apdu.nc < 2) {
return SW_WRONG_LENGTH();
}
uint16_t row = (apdu.data[0] << 8) | apdu.data[1];
bool israw = P2(apdu) == 0x1;
if (apdu.nc == 2) {
if (row > 0xbf && row < 0xf48) {
return SW_WRONG_DATA();
}
if (israw) {
memcpy(res_APDU, otp_buffer_raw(row), apdu.ne);
}
else {
memcpy(res_APDU, otp_buffer(row), apdu.ne);
}
res_APDU_size = apdu.ne;
}
else {
apdu.nc -= 2;
apdu.data += 2;
if (apdu.nc > 1024) {
return SW_WRONG_LENGTH();
}
if (apdu.nc % (israw ? 4 : 2)) {
return SW_WRONG_DATA();
}
uint8_t adata[1024] __attribute__((aligned(4)));
memcpy(adata, apdu.data, apdu.nc);
int ret = 0;
if (israw) {
ret = otp_write_data_raw(row, adata, apdu.nc);
}
else {
ret = otp_write_data(row, adata, apdu.nc);
}
if (ret != 0) {
return SW_EXEC_ERROR();
}
}
}
#endif
else {
return SW_INCORRECT_P1P2();
}
return SW_OK();
}
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