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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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <ipxe/dhcp.h>
#include <ipxe/settings.h>
#include <ipxe/clientcert.h>
/** @file
*
* Client certificate store
*
* 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
*
*/
/* Sanity checks */
#if defined(CERTIFICATE) && ! defined(PRIVATE_KEY)
#warning "Attempting to embed certificate with no corresponding private key"
#endif
#if defined(PRIVATE_KEY) && ! defined(CERTIFICATE)
#warning "Attempting to embed private key with no corresponding certificate"
#endif
/* Allow client certificates to be overridden if not explicitly specified */
#ifdef CERTIFICATE
#define ALLOW_CERT_OVERRIDE 0
#else
#define ALLOW_CERT_OVERRIDE 1
#endif
/* Raw client certificate data */
extern char client_certificate_data[];
extern char client_certificate_len[];
__asm__ ( ".section \".rodata\", \"a\", @progbits\n\t"
"\nclient_certificate_data:\n\t"
#ifdef CERTIFICATE
".incbin \"" CERTIFICATE "\"\n\t"
#endif /* CERTIFICATE */
".size client_certificate_data, ( . - client_certificate_data )\n\t"
".equ client_certificate_len, ( . - client_certificate_data )\n\t"
".previous\n\t" );
/* Raw client private key data */
extern char client_private_key_data[];
extern char client_private_key_len[];
__asm__ ( ".section \".rodata\", \"a\", @progbits\n\t"
"\nclient_private_key_data:\n\t"
#ifdef PRIVATE_KEY
".incbin \"" PRIVATE_KEY "\"\n\t"
#endif /* PRIVATE_KEY */
".size client_private_key_data, ( . - client_private_key_data )\n\t"
".equ client_private_key_len, ( . - client_private_key_data )\n\t"
".previous\n\t" );
/** Client certificate */
struct client_certificate client_certificate = {
.data = client_certificate_data,
.len = ( ( size_t ) client_certificate_len ),
};
/** Client private key */
struct client_private_key client_private_key = {
.data = client_private_key_data,
.len = ( ( size_t ) client_private_key_len ),
};
/** Client certificate setting */
static struct setting cert_setting __setting ( SETTING_CRYPTO, cert ) = {
.name = "cert",
.description = "Client certificate",
.tag = DHCP_EB_CERT,
.type = &setting_type_hex,
};
/** Client private key setting */
static struct setting privkey_setting __setting ( SETTING_CRYPTO, privkey ) = {
.name = "privkey",
.description = "Client private key",
.tag = DHCP_EB_KEY,
.type = &setting_type_hex,
};
/**
* Apply client certificate store configuration settings
*
* @ret rc Return status code
*/
static int clientcert_apply_settings ( void ) {
static void *cert = NULL;
static void *key = NULL;
int len;
/* Allow client certificate to be overridden only if
* not explicitly specified at build time.
*/
if ( ALLOW_CERT_OVERRIDE ) {
/* Restore default client certificate */
client_certificate.data = client_certificate_data;
client_certificate.len = ( ( size_t ) client_certificate_len );
/* Fetch new client certificate, if any */
free ( cert );
if ( ( len = fetch_raw_setting_copy ( NULL, &cert_setting,
&cert ) ) >= 0 ) {
client_certificate.data = cert;
client_certificate.len = len;
}
/* Restore default client private key */
client_private_key.data = client_private_key_data;
client_private_key.len = ( ( size_t ) client_private_key_len );
/* Fetch new client private key, if any */
free ( key );
if ( ( len = fetch_raw_setting_copy ( NULL, &privkey_setting,
&key ) ) >= 0 ) {
client_private_key.data = key;
client_private_key.len = len;
}
}
/* Debug */
if ( have_client_certificate() ) {
DBGC ( &client_certificate, "CLIENTCERT using %s "
"certificate:\n", ( cert ? "external" : "built-in" ) );
DBGC_HDA ( &client_certificate, 0, client_certificate.data,
client_certificate.len );
DBGC ( &client_certificate, "CLIENTCERT using %s private "
"key:\n", ( key ? "external" : "built-in" ) );
DBGC_HDA ( &client_certificate, 0, client_private_key.data,
client_private_key.len );
} else {
DBGC ( &client_certificate, "CLIENTCERT has no certificate\n" );
}
return 0;
}
/** Client certificate store settings applicator */
struct settings_applicator clientcert_applicator __settings_applicator = {
.apply = clientcert_apply_settings,
};
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