--- /dev/null
+/*
+ * Copyright (C) 2014 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 <string.h>
+#include <stdlib.h>
+#include <ipxe/init.h>
+#include <ipxe/dhcp.h>
+#include <ipxe/settings.h>
+#include <ipxe/malloc.h>
+#include <ipxe/crypto.h>
+#include <ipxe/asn1.h>
+#include <ipxe/x509.h>
+#include <ipxe/certstore.h>
+
+/** @file
+ *
+ * Certificate store
+ *
+ */
+
+/** Raw certificate data for all permanent stored certificates */
+#undef CERT
+#define CERT( _index, _path ) \
+ extern char stored_cert_ ## _index ## _data[]; \
+ extern char stored_cert_ ## _index ## _len[]; \
+ __asm__ ( ".section \".rodata\", \"a\", @progbits\n\t" \
+ "\nstored_cert_" #_index "_data:\n\t" \
+ ".incbin \"" _path "\"\n\t" \
+ "\nstored_cert_" #_index "_end:\n\t" \
+ ".equ stored_cert_" #_index "_len, " \
+ "( stored_cert_" #_index "_end - " \
+ " stored_cert_" #_index "_data )\n\t" \
+ ".previous\n\t" );
+CERT_ALL
+
+/** Raw certificate cursors for all permanent stored certificates */
+#undef CERT
+#define CERT( _index, _path ) { \
+ .data = stored_cert_ ## _index ## _data, \
+ .len = ( size_t ) stored_cert_ ## _index ## _len, \
+},
+static struct asn1_cursor certstore_raw[] = {
+ CERT_ALL
+};
+
+/** X.509 certificate structures for all permanent stored certificates */
+static struct x509_certificate certstore_certs[ sizeof ( certstore_raw ) /
+ sizeof ( certstore_raw[0] ) ];
+
+/** Certificate store */
+struct x509_chain certstore = {
+ .refcnt = REF_INIT ( ref_no_free ),
+ .links = LIST_HEAD_INIT ( certstore.links ),
+};
+
+/**
+ * Mark stored certificate as most recently used
+ *
+ * @v cert X.509 certificate
+ * @ret cert X.509 certificate
+ */
+static struct x509_certificate *
+certstore_found ( struct x509_certificate *cert ) {
+
+ /* Mark as most recently used */
+ list_del ( &cert->store.list );
+ list_add ( &cert->store.list, &certstore.links );
+ DBGC2 ( &certstore, "CERTSTORE found certificate %s\n",
+ x509_name ( cert ) );
+
+ return cert;
+}
+
+/**
+ * Find certificate in store
+ *
+ * @v raw Raw certificate data
+ * @ret cert X.509 certificate, or NULL if not found
+ */
+struct x509_certificate * certstore_find ( struct asn1_cursor *raw ) {
+ struct x509_certificate *cert;
+
+ /* Search for certificate within store */
+ list_for_each_entry ( cert, &certstore.links, store.list ) {
+ if ( asn1_compare ( raw, &cert->raw ) == 0 )
+ return certstore_found ( cert );
+ }
+ return NULL;
+}
+
+/**
+ * Find certificate in store corresponding to a private key
+ *
+ * @v key Private key
+ * @ret cert X.509 certificate, or NULL if not found
+ */
+struct x509_certificate * certstore_find_key ( struct asn1_cursor *key ) {
+ struct x509_certificate *cert;
+
+ /* Search for certificate within store */
+ list_for_each_entry ( cert, &certstore.links, store.list ) {
+ if ( pubkey_match ( cert->signature_algorithm->pubkey,
+ key->data, key->len,
+ cert->subject.public_key.raw.data,
+ cert->subject.public_key.raw.len ) == 0 )
+ return certstore_found ( cert );
+ }
+ return NULL;
+}
+
+/**
+ * Add certificate to store
+ *
+ * @v cert X.509 certificate
+ */
+void certstore_add ( struct x509_certificate *cert ) {
+
+ /* Add certificate to store */
+ cert->store.cert = cert;
+ x509_get ( cert );
+ list_add ( &cert->store.list, &certstore.links );
+ DBGC ( &certstore, "CERTSTORE added certificate %s\n",
+ x509_name ( cert ) );
+}
+
+/**
+ * Discard a stored certificate
+ *
+ * @ret discarded Number of cached items discarded
+ */
+static unsigned int certstore_discard ( void ) {
+ struct x509_certificate *cert;
+
+ /* Discard the least recently used certificate for which the
+ * only reference is held by the store itself.
+ */
+ list_for_each_entry_reverse ( cert, &certstore.links, store.list ) {
+ if ( cert->refcnt.count == 0 ) {
+ DBGC ( &certstore, "CERTSTORE discarded certificate "
+ "%s\n", x509_name ( cert ) );
+ list_del ( &cert->store.list );
+ x509_put ( cert );
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/** Certificate store cache discarder */
+struct cache_discarder certstore_discarder __cache_discarder ( CACHE_NORMAL ) ={
+ .discard = certstore_discard,
+};
+
+/**
+ * Construct permanent certificate store
+ *
+ */
+static void certstore_init ( void ) {
+ struct asn1_cursor *raw;
+ struct x509_certificate *cert;
+ int i;
+ int rc;
+
+ /* Skip if we have no permanent stored certificates */
+ if ( ! sizeof ( certstore_raw ) )
+ return;
+
+ /* Add certificates */
+ for ( i = 0 ; i < ( int ) ( sizeof ( certstore_raw ) /
+ sizeof ( certstore_raw[0] ) ) ; i++ ) {
+
+ /* Skip if certificate already present in store */
+ raw = &certstore_raw[i];
+ if ( ( cert = certstore_find ( raw ) ) != NULL ) {
+ DBGC ( &certstore, "CERTSTORE permanent certificate %d "
+ "is a duplicate of %s\n", i, x509_name ( cert ));
+ continue;
+ }
+
+ /* Parse certificate */
+ cert = &certstore_certs[i];
+ ref_init ( &cert->refcnt, ref_no_free );
+ if ( ( rc = x509_parse ( cert, raw ) ) != 0 ) {
+ DBGC ( &certstore, "CERTSTORE could not parse "
+ "permanent certificate %d: %s\n",
+ i, strerror ( rc ) );
+ continue;
+ }
+
+ /* Add certificate to store. Certificate will never
+ * be discarded from the store, since we retain a
+ * permanent reference to it.
+ */
+ certstore_add ( cert );
+ DBGC ( &certstore, "CERTSTORE permanent certificate %d is %s\n",
+ i, x509_name ( cert ) );
+ }
+}
+
+/** Certificate store initialisation function */
+struct init_fn certstore_init_fn __init_fn ( INIT_LATE ) = {
+ .initialise = certstore_init,
+};
+
+/** Additional certificate setting */
+static struct setting cert_setting __setting ( SETTING_CRYPTO, cert ) = {
+ .name = "cert",
+ .description = "Certificate",
+ .tag = DHCP_EB_CERT,
+ .type = &setting_type_hex,
+};
+
+/**
+ * Apply certificate store configuration settings
+ *
+ * @ret rc Return status code
+ */
+static int certstore_apply_settings ( void ) {
+ static struct x509_certificate *cert = NULL;
+ struct x509_certificate *old_cert;
+ void *cert_data;
+ int len;
+ int rc;
+
+ /* Record any existing additional certificate */
+ old_cert = cert;
+ cert = NULL;
+
+ /* Add additional certificate, if any */
+ if ( ( len = fetch_raw_setting_copy ( NULL, &cert_setting,
+ &cert_data ) ) >= 0 ) {
+ if ( ( rc = x509_certificate ( cert_data, len, &cert ) ) == 0 ){
+ DBGC ( &certstore, "CERTSTORE added additional "
+ "certificate %s\n", x509_name ( cert ) );
+ } else {
+ DBGC ( &certstore, "CERTSTORE could not parse "
+ "additional certificate: %s\n",
+ strerror ( rc ) );
+ /* Do not fail; leave as an unusable certificate */
+ }
+ free ( cert_data );
+ }
+
+ /* Free old additional certificiate. Do this after reparsing
+ * the additional certificate; in the common case that the
+ * certificate has not changed, this will allow the stored
+ * certificate to be reused.
+ */
+ x509_put ( old_cert );
+
+ return 0;
+}
+
+/** Certificate store settings applicator */
+struct settings_applicator certstore_applicator __settings_applicator = {
+ .apply = certstore_apply_settings,
+};
Code Review / kvmfornfv.git / blobdiff