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/*
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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; either version 2 of the
* License, or any later version.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <ipxe/dhcp.h>
#include <ipxe/settings.h>
#include <ipxe/x509.h>
#include <ipxe/privkey.h>
/** @file
*
* Private key
*
* Life would in theory be easier if we could use a single file to
* hold both the certificate and corresponding private key.
* Unfortunately, the only common format which supports this is
* PKCS#12 (aka PFX), which is too ugly to be allowed anywhere near my
* codebase. See, for reference and amusement:
*
* http://www.cs.auckland.ac.nz/~pgut001/pubs/pfx.html
*/
/* Allow private key to be overridden if not explicitly specified */
#ifdef PRIVATE_KEY
#define ALLOW_KEY_OVERRIDE 0
#else
#define ALLOW_KEY_OVERRIDE 1
#endif
/* Raw private key data */
extern char private_key_data[];
extern char private_key_len[];
__asm__ ( ".section \".rodata\", \"a\", " PROGBITS "\n\t"
"\nprivate_key_data:\n\t"
#ifdef PRIVATE_KEY
".incbin \"" PRIVATE_KEY "\"\n\t"
#endif /* PRIVATE_KEY */
".size private_key_data, ( . - private_key_data )\n\t"
".equ private_key_len, ( . - private_key_data )\n\t"
".previous\n\t" );
/** Private key */
struct asn1_cursor private_key = {
.data = private_key_data,
.len = ( ( size_t ) private_key_len ),
};
/** Default private key */
static struct asn1_cursor default_private_key = {
.data = private_key_data,
.len = ( ( size_t ) private_key_len ),
};
/** Private key setting */
static struct setting privkey_setting __setting ( SETTING_CRYPTO, privkey ) = {
.name = "privkey",
.description = "Private key",
.tag = DHCP_EB_KEY,
.type = &setting_type_hex,
};
/**
* Apply private key configuration settings
*
* @ret rc Return status code
*/
static int privkey_apply_settings ( void ) {
static void *key_data = NULL;
int len;
/* Allow private key to be overridden only if not explicitly
* specified at build time.
*/
if ( ALLOW_KEY_OVERRIDE ) {
/* Restore default private key */
memcpy ( &private_key, &default_private_key,
sizeof ( private_key ) );
/* Fetch new private key, if any */
free ( key_data );
if ( ( len = fetch_raw_setting_copy ( NULL, &privkey_setting,
&key_data ) ) >= 0 ) {
private_key.data = key_data;
private_key.len = len;
}
}
/* Debug */
if ( private_key.len ) {
DBGC ( &private_key, "PRIVKEY using %s private key:\n",
( key_data ? "external" : "built-in" ) );
DBGC_HDA ( &private_key, 0, private_key.data, private_key.len );
} else {
DBGC ( &private_key, "PRIVKEY has no private key\n" );
}
return 0;
}
/** Private key settings applicator */
struct settings_applicator privkey_applicator __settings_applicator = {
.apply = privkey_apply_settings,
};
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