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/*
* mgmt-masterkey.c
* ----------------
* Masterkey CLI functions.
*
* Copyright (c) 2016, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Rename both CMSIS HAL_OK and libhal HAL_OK to disambiguate */
#define HAL_OK CMSIS_HAL_OK
#include "stm-init.h"
#include "stm-uart.h"
#include "mgmt-cli.h"
#include "mgmt-masterkey.h"
#undef HAL_OK
#define LIBHAL_OK HAL_OK
#include <hal.h>
#warning Refactor so we do not need to include hal_internal.h here
#include <hal_internal.h>
#undef HAL_OK
#include <stdlib.h>
static char * _status2str(const hal_error_t status)
{
switch (status) {
case LIBHAL_OK:
return (char *) "Set";
case HAL_ERROR_MASTERKEY_NOT_SET:
return (char *) "Not set";
default:
return (char *) "Unknown";
}
}
static int cmd_masterkey_status(struct cli_def *cli, const char *command, char *argv[], int argc)
{
hal_error_t status;
command = command;
argv = argv;
argc = argc;
cli_print(cli, "Status of master key:\n");
status = hal_mkm_volatile_read(NULL, 0);
cli_print(cli, " volatile: %s / %s", _status2str(status), hal_error_string(status));
status = hal_mkm_flash_read(NULL, 0);
cli_print(cli, " flash: %s / %s", _status2str(status), hal_error_string(status));
return CLI_OK;
}
static int str_to_hex_digit(char c)
{
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'a' && c <= 'f')
c = c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
c = c - 'A' + 10;
else
return -1;
return c;
}
static inline char hex_to_str_digit(const uint8_t c)
{
return (c < 10) ? ((char)c + '0') : ((char)c + 'A' - 10);
}
static char *hexdump_kek(const uint8_t * const kek)
{
/* This is only for dumping masterkey values, so has no length checks.
* Do not use it for anything else.
*
* For convenience of possibly hand-copying and hand-retyping, the key
* is divided into 8 4-byte (8-character) groups.
*/
static char buf[2 * KEK_LENGTH + 8];
char *dst = buf;
for (size_t i = 0; i < KEK_LENGTH; ++i) {
uint8_t b = kek[i];
*dst++ = hex_to_str_digit(b >> 4);
*dst++ = hex_to_str_digit(b & 0xf);
if ((i & 3) == 3)
*dst++ = ' ';
}
buf[sizeof(buf) - 1] = '\0';
return buf;
}
static int _masterkey_set(struct cli_def *cli, char *argv[], int argc,
char *label, hal_error_t (*writer)(const uint8_t * const, const size_t))
{
uint8_t buf[KEK_LENGTH] = {0};
hal_error_t err;
if (argc == 0) {
/* fill master key with yummy randomness */
if ((err = hal_get_random(NULL, buf, sizeof(buf))) != LIBHAL_OK) {
cli_print(cli, "Error getting random key: %s", hal_error_string(err));
return CLI_ERROR;
}
cli_print(cli, "Random key:\n%s", hexdump_kek(buf));
}
else {
/* input is 32 hex bytes, arranged however the user wants */
size_t len = 0;
for (int i = 0; i < argc; ++i) {
for (char *cp = argv[i]; *cp != '\0'; ) {
int c;
if ((c = str_to_hex_digit(*cp++)) < 0)
goto errout;
buf[len] = c << 4;
if ((c = str_to_hex_digit(*cp++)) < 0)
goto errout;
buf[len] |= c & 0xf;
if (++len > KEK_LENGTH)
goto errout;
}
}
if (len < KEK_LENGTH) {
errout:
cli_print(cli, "Failed parsing master key, expected exactly %d hex bytes", KEK_LENGTH);
return CLI_ERROR;
}
cli_print(cli, "Parsed key:\n%s", hexdump_kek(buf));
}
if ((err = writer(buf, sizeof(buf))) == LIBHAL_OK) {
cli_print(cli, "Master key set in %s memory", label);
} else {
cli_print(cli, "Failed writing key to %s memory: %s", label, hal_error_string(err));
}
return CLI_OK;
}
static int cmd_masterkey_set(struct cli_def *cli, const char *command, char *argv[], int argc)
{
command = command;
return _masterkey_set(cli, argv, argc, "volatile", hal_mkm_volatile_write);
}
static int cmd_masterkey_erase(struct cli_def *cli, const char *command, char *argv[], int argc)
{
hal_error_t err;
command = command;
argv = argv;
argc = argc;
if ((err = hal_mkm_volatile_erase(KEK_LENGTH)) == LIBHAL_OK) {
cli_print(cli, "Erased master key from volatile memory");
} else {
cli_print(cli, "Failed erasing master key from volatile memory: %s", hal_error_string(err));
}
return CLI_OK;
}
static int cmd_masterkey_unsecure_set(struct cli_def *cli, const char *command, char *argv[], int argc)
{
command = command;
return _masterkey_set(cli, argv, argc, "flash", hal_mkm_flash_write);
}
static int cmd_masterkey_unsecure_erase(struct cli_def *cli, const char *command, char *argv[], int argc)
{
hal_error_t err;
command = command;
argv = argv;
argc = argc;
if ((err = hal_mkm_flash_erase(KEK_LENGTH)) == LIBHAL_OK) {
cli_print(cli, "Erased unsecure master key from flash");
} else {
cli_print(cli, "Failed erasing unsecure master key from flash: %s", hal_error_string(err));
}
return CLI_OK;
}
void configure_cli_masterkey(struct cli_def *cli)
{
struct cli_command *c = cli_register_command(cli, NULL, "masterkey", NULL, 0, 0, NULL);
/* masterkey status */
cli_register_command(cli, c, "status", cmd_masterkey_status, 0, 0, "Show status of master key in RAM/flash");
/* masterkey set */
cli_register_command(cli, c, "set", cmd_masterkey_set, 0, 0, "Set the master key in the volatile Master Key Memory");
/* masterkey erase */
cli_register_command(cli, c, "erase", cmd_masterkey_erase, 0, 0, "Erase the master key from the volatile Master Key Memory");
struct cli_command *c_unsecure = cli_register_command(cli, c, "unsecure", NULL, 0, 0, NULL);
/* masterkey unsecure set */
cli_register_command(cli, c_unsecure, "set", cmd_masterkey_unsecure_set, 0, 0, "Set master key in unprotected flash memory (if unsure, DON'T)");
/* masterkey unsecure erase */
cli_register_command(cli, c_unsecure, "erase", cmd_masterkey_unsecure_erase, 0, 0, "Erase master key from unprotected flash memory");
}
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