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