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/* Root certificates, for libreswan
*
* Copyright (C) 2015,2018 Matt Rogers <[email protected]>
* Copyright (C) 2017-2018 Paul Wouters <[email protected]>
* Copyright (C) 2018-2019 Andrew Cagney <[email protected]>
*
* 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 (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* 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.
*
*/
#include <features.h>
#include <cert.h>
#include "defs.h"
#include "root_certs.h"
#include "server.h"
#include "pluto_timing.h"
#include "log.h"
static struct root_certs *root_cert_db;
static void root_certs_free(void *obj, where_t unused_where UNUSED)
{
struct root_certs *root_certs = obj;
dbg("destroying root certificate cache");
CERT_DestroyCertList(root_certs->trustcl);
pfreeany(root_certs);
}
struct root_certs *root_certs_addref_where(where_t where)
{
passert(in_main_thread());
/* extend or set cert cache lifetime */
schedule_oneshot_timer(EVENT_FREE_ROOT_CERTS, FREE_ROOT_CERTS_TIMEOUT);
if (root_cert_db != NULL) {
return addref_where(root_cert_db, where);
}
dbg("loading root certificate cache");
/*
* Always allocate the ROOT_CERTS structure. If things fail,
* it will contain an empty list of certificates (but avoid
* possibly expensive attempts to re-load).
*/
root_cert_db = refcnt_alloc(struct root_certs, root_certs_free, where);
/*
* Start with two references: the ROOT_CERT_DB; and the result
* of this function.
*/
struct root_certs *root_certs = addref_where(root_cert_db, where); /* function result */
root_certs->trustcl = CERT_NewCertList();
struct logger logger = global_logger;
PK11SlotInfo *slot = lsw_nss_get_authenticated_slot(&logger);
if (slot == NULL) {
/* already logged */
return root_certs; /* empty, but non-null, list */
}
/*
* This is the killer when it comes to performance.
*/
threadtime_t get_time = threadtime_start();
CERTCertList *allcerts = PK11_ListCertsInSlot(slot);
threadtime_stop(&get_time, SOS_NOBODY, "%s() calling PK11_ListCertsInSlot()", __func__);
if (allcerts == NULL) {
return root_certs;
}
/*
* XXX: would a better call be
* CERT_FilterCertListByUsage(allcerts, certUsageAnyCA,
* PR_TRUE)? Timing tests suggest it makes little difference,
* and the result is being cached anyway.
*/
threadtime_t ca_time = threadtime_start();
for (CERTCertListNode *node = CERT_LIST_HEAD(allcerts);
!CERT_LIST_END(node, allcerts);
node = CERT_LIST_NEXT(node)) {
if (!CERT_IsCACert(node->cert, NULL)) {
dbg("discarding non-CA cert %s", node->cert->subjectName);
continue;
}
if (!node->cert->isRoot) {
dbg("discarding non-root CA cert %s", node->cert->subjectName);
continue;
}
dbg("adding the CA root cert %s", node->cert->subjectName);
CERTCertificate *dup = CERT_DupCertificate(node->cert);
CERT_AddCertToListTail(root_certs->trustcl, dup);
}
CERT_DestroyCertList(allcerts);
threadtime_stop(&ca_time, SOS_NOBODY, "%s() filtering CAs", __func__);
return root_certs;
}
void root_certs_delref_where(struct root_certs **root_certs, where_t where)
{
delref_where(root_certs, where);
}
bool root_certs_empty(const struct root_certs *root_certs)
{
return (!pexpect(root_certs != NULL) ||
root_certs->trustcl == NULL ||
CERT_LIST_EMPTY(root_certs->trustcl));
}
void init_root_certs(void)
{
/*
* Set up the timer for deleting the root certs, but don't
* schedule it (it gets scheduled when the root certs are
* allocated).
*/
init_oneshot_timer(EVENT_FREE_ROOT_CERTS, free_root_certs);
}
void free_root_certs(struct logger *logger)
{
passert(in_main_thread());
/*
* This function can be called during shutdown when there are
* no certs.
*/
if (root_cert_db == NULL) {
return;
}
/*
* Deal with a helper thread being stuck (because it is being debugged?);
* need to peek at the refcnt.
*
* There is a race condition: the reference count may be changed between
* the call to refcnt_peek and the root_certs_delref's deletion.
* The consequence is benign: only a delay of FREE_ROOT_CERTS_TIMEOUT.
*/
if (refcnt_peek(&root_cert_db->refcnt) > 1) {
llog(RC_LOG, logger, "root certs still in use; suspect stuck thread");
/* extend or set cert cache lifetime */
schedule_oneshot_timer(EVENT_FREE_ROOT_CERTS, FREE_ROOT_CERTS_TIMEOUT);
} else {
root_certs_delref(&root_cert_db);
pexpect(root_cert_db == NULL);
}
}
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