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/*
* ipsecmod/ipsecmod-whitelist.h - White listed domains for the ipsecmod to
* operate on.
*
* Copyright (c) 2017, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* Keep track of the white listed domains for ipsecmod.
*/
#include "config.h"
#ifdef USE_IPSECMOD
#include "ipsecmod/ipsecmod.h"
#include "ipsecmod/ipsecmod-whitelist.h"
#include "util/regional.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/rbtree.h"
#include "util/data/dname.h"
#include "util/storage/dnstree.h"
#include "sldns/str2wire.h"
/** Apply ipsecmod-whitelist string. */
static int
whitelist_str_cfg(rbtree_type* whitelist, const char* name)
{
struct name_tree_node* n;
size_t len;
uint8_t* nm = sldns_str2wire_dname(name, &len);
if(!nm) {
log_err("ipsecmod: could not parse %s for whitelist.", name);
return 0;
}
n = (struct name_tree_node*)calloc(1, sizeof(*n));
if(!n) {
log_err("ipsecmod: out of memory while creating whitelist.");
free(nm);
return 0;
}
n->node.key = n;
n->name = nm;
n->len = len;
n->labs = dname_count_labels(nm);
n->dclass = LDNS_RR_CLASS_IN;
if(!name_tree_insert(whitelist, n, nm, len, n->labs, n->dclass)) {
/* duplicate element ignored, idempotent */
free(n->name);
free(n);
}
return 1;
}
/** Read ipsecmod-whitelist config. */
static int
read_whitelist(rbtree_type* whitelist, struct config_file* cfg)
{
struct config_strlist* p;
for(p = cfg->ipsecmod_whitelist; p; p = p->next) {
log_assert(p->str);
if(!whitelist_str_cfg(whitelist, p->str))
return 0;
}
return 1;
}
int
ipsecmod_whitelist_apply_cfg(struct ipsecmod_env* ie,
struct config_file* cfg)
{
ie->whitelist = rbtree_create(name_tree_compare);
if(!read_whitelist(ie->whitelist, cfg))
return 0;
name_tree_init_parents(ie->whitelist);
return 1;
}
/** Delete ipsecmod_env->whitelist element. */
static void
whitelist_free(struct rbnode_type* n, void* ATTR_UNUSED(d))
{
if(n) {
free(((struct name_tree_node*)n)->name);
free(n);
}
}
/** Get memory usage of ipsecmod_env->whitelist element. */
static void
whitelist_get_mem(struct rbnode_type* n, void* arg)
{
struct name_tree_node* node = (struct name_tree_node*)n;
size_t* size = (size_t*) arg;
if(node) {
*size += sizeof(node) + node->len;
}
}
void
ipsecmod_whitelist_delete(rbtree_type* whitelist)
{
if(whitelist) {
traverse_postorder(whitelist, whitelist_free, NULL);
free(whitelist);
}
}
int
ipsecmod_domain_is_whitelisted(struct ipsecmod_env* ie, uint8_t* dname,
size_t dname_len, uint16_t qclass)
{
if(!ie->whitelist) return 1; /* No whitelist, treat as whitelisted. */
return name_tree_lookup(ie->whitelist, dname, dname_len,
dname_count_labels(dname), qclass) != NULL;
}
size_t
ipsecmod_whitelist_get_mem(rbtree_type* whitelist)
{
size_t size = 0;
if(whitelist) {
traverse_postorder(whitelist, whitelist_get_mem, &size);
}
return size;
}
#endif /* USE_IPSECMOD */
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