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/*
* Copyright (c) 2024 Gergo Ferenc Kovacs
* Copyright (c) 2019 Airbus Commercial Aircraft
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
#include <glib.h>
#include <openssl/rand.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
#include "messages.h"
#include "slog.h"
// Options
static gboolean master = FALSE;
static gboolean host = FALSE;
static gboolean counter = FALSE;
static GOptionEntry entries[] =
{
{ "master-key", 'm', 0, G_OPTION_ARG_NONE, &master, "Generate a master key", NULL },
{ "derive-host-key", 'd', 0, G_OPTION_ARG_NONE, &host, "Derive a host key from an existing master key", NULL },
{ "counter", 'c', 0, G_OPTION_ARG_NONE, &counter, "Display current host key counter", NULL },
{ NULL }
};
int main(int argc, char **argv)
{
GError *error = NULL;
GOptionContext *context = g_option_context_new("- secure logging key management\n\n " \
"Master key generation:\tslogkey -m MASTERKEY\n " \
"Host key derivation:\t\tslogkey -d MASTERKEY MACADDRESS SERIALNUMBER HOSTKEY\n " \
"Host key counter display:\tslogkey -c HOSTKEY");
g_option_context_add_main_entries (context, entries, NULL);
if (!g_option_context_parse (context, &argc, &argv, &error))
{
g_print ("Invalid option: %s\n", error->message);
exit (1);
}
if (argc < 2)
{
g_print("%s", g_option_context_get_help(context, TRUE, NULL));
g_option_context_free(context);
return -1;
}
gboolean ok = TRUE;
// Options are mutually exclusive
if (master && host)
{
ok = FALSE;
}
else if (master && counter)
{
ok = FALSE;
}
else if (host && counter)
{
ok = FALSE;
}
else if (master && host && counter)
{
ok = FALSE;
}
if (!ok)
{
g_print("%s", g_option_context_get_help(context, TRUE, NULL));
g_option_context_free(context);
return -1;
}
// Master key generation and sequence counter display need one option and a single argument
if ((master || counter) && argc > 2)
{
g_print("%s", g_option_context_get_help(context, TRUE, NULL));
g_option_context_free(context);
return -1;
}
// Host key derivation needs one option and four arguments
if(host && argc != 5)
{
g_print("%s", g_option_context_get_help(context, TRUE, NULL));
g_option_context_free(context);
return -1;
}
// Option parsing successful -> context can be released
g_option_context_free(context);
int ret = 0;
int success = 0;
int index = 1;
// Initialize internal messaging
msg_init(TRUE);
if (master)
{
guchar masterkey[KEY_LENGTH];
char *keyfile = argv[index];
success = generateMasterKey(masterkey);
if(!success)
{
msg_error("Unable to create master key");
ret = -1;
}
else
{
success = writeKey((gchar *)masterkey, 0, keyfile);
if(!success)
{
msg_error("[SLOG] ERROR: Unable to write master key to file", evt_tag_str("file", keyfile));
ret = -1;
}
}
return ret;
}
else if (counter)
{
// Display key counter
char key[KEY_LENGTH];
char *keyfile = argv[index];
guint64 counterValue;
success = readKey(key, &counterValue, keyfile);
if(!success)
{
msg_error("[SLOG] ERROR: Unable to read key file", evt_tag_str("file", keyfile));
return ret;
}
printf("counter=%" G_GUINT64_FORMAT "\n", counterValue);
}
else if (host)
{
// Arguments
gchar *masterKeyFileName = argv[index];
index++;
gchar *macAddr = argv[index];
index++;
gchar *serial = argv[index];
index++;
gchar *hostKeyFileName = argv[index];
gchar masterKey[KEY_LENGTH] = { 0 };
guint64 counterValue;
success = readKey((char *)masterKey, &counterValue, masterKeyFileName);
if (!success)
{
msg_error("[SLOG] ERROR: Unable to read master key", evt_tag_str("file", masterKeyFileName));
ret = -1;
}
else
{
guchar hostKey[KEY_LENGTH];
success = deriveHostKey((guchar *)masterKey, macAddr, serial, hostKey);
if(!success)
{
msg_error("[SLOG] ERROR: Unable to derive a host key");
ret = -1;
}
else
{
success = writeKey((char *)hostKey, 0, hostKeyFileName);
if(success == 0)
{
msg_error("[SLOG] ERROR: Unable to write host key to file", evt_tag_str("file", hostKeyFileName));
ret = -1;
}
}
}
}
// Release messaging resources
msg_deinit();
return ret;
}
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