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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <config.h>
#include <inttypes.h>
#include <string.h>
#include <isc/base64.h>
#include <isc/buffer.h>
#include <isc/file.h>
#include <isc/mem.h>
#include <isc/util.h>
#include <isccfg/dnsconf.h>
#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdatastruct.h>
#include <irs/dnsconf.h>
#define IRS_DNSCONF_MAGIC ISC_MAGIC('D', 'c', 'f', 'g')
#define IRS_DNSCONF_VALID(c) ISC_MAGIC_VALID(c, IRS_DNSCONF_MAGIC)
/*!
* configuration data structure
*/
struct irs_dnsconf {
unsigned int magic;
isc_mem_t *mctx;
irs_dnsconf_dnskeylist_t trusted_keylist;
};
static isc_result_t
configure_dnsseckeys(irs_dnsconf_t *conf, cfg_obj_t *cfgobj,
dns_rdataclass_t rdclass)
{
isc_mem_t *mctx = conf->mctx;
const cfg_obj_t *keys = NULL;
const cfg_obj_t *key, *keylist;
dns_fixedname_t fkeyname;
dns_name_t *keyname_base, *keyname;
const cfg_listelt_t *element, *element2;
isc_result_t result;
uint32_t flags, proto, alg;
const char *keystr, *keynamestr;
unsigned char keydata[4096];
isc_buffer_t keydatabuf_base, *keydatabuf;
dns_rdata_dnskey_t keystruct;
unsigned char rrdata[4096];
isc_buffer_t rrdatabuf;
isc_region_t r;
isc_buffer_t namebuf;
irs_dnsconf_dnskey_t *keyent;
cfg_map_get(cfgobj, "trusted-keys", &keys);
if (keys == NULL)
return (ISC_R_SUCCESS);
for (element = cfg_list_first(keys);
element != NULL;
element = cfg_list_next(element)) {
keylist = cfg_listelt_value(element);
for (element2 = cfg_list_first(keylist);
element2 != NULL;
element2 = cfg_list_next(element2))
{
keydatabuf = NULL;
keyname = NULL;
key = cfg_listelt_value(element2);
flags = cfg_obj_asuint32(cfg_tuple_get(key, "flags"));
proto = cfg_obj_asuint32(cfg_tuple_get(key,
"protocol"));
alg = cfg_obj_asuint32(cfg_tuple_get(key,
"algorithm"));
keynamestr = cfg_obj_asstring(cfg_tuple_get(key,
"name"));
keystruct.common.rdclass = rdclass;
keystruct.common.rdtype = dns_rdatatype_dnskey;
keystruct.mctx = NULL;
ISC_LINK_INIT(&keystruct.common, link);
if (flags > 0xffff)
return (ISC_R_RANGE);
if (proto > 0xff)
return (ISC_R_RANGE);
if (alg > 0xff)
return (ISC_R_RANGE);
keystruct.flags = (uint16_t)flags;
keystruct.protocol = (uint8_t)proto;
keystruct.algorithm = (uint8_t)alg;
isc_buffer_init(&keydatabuf_base, keydata,
sizeof(keydata));
isc_buffer_init(&rrdatabuf, rrdata, sizeof(rrdata));
/* Configure key value */
keystr = cfg_obj_asstring(cfg_tuple_get(key, "key"));
result = isc_base64_decodestring(keystr,
&keydatabuf_base);
if (result != ISC_R_SUCCESS)
return (result);
isc_buffer_usedregion(&keydatabuf_base, &r);
keystruct.datalen = r.length;
keystruct.data = r.base;
result = dns_rdata_fromstruct(NULL,
keystruct.common.rdclass,
keystruct.common.rdtype,
&keystruct, &rrdatabuf);
if (result != ISC_R_SUCCESS)
return (result);
isc_buffer_usedregion(&rrdatabuf, &r);
result = isc_buffer_allocate(mctx, &keydatabuf,
r.length);
if (result != ISC_R_SUCCESS)
return (result);
result = isc_buffer_copyregion(keydatabuf, &r);
if (result != ISC_R_SUCCESS)
goto cleanup;
/* Configure key name */
keyname_base = dns_fixedname_initname(&fkeyname);
isc_buffer_constinit(&namebuf, keynamestr,
strlen(keynamestr));
isc_buffer_add(&namebuf, strlen(keynamestr));
result = dns_name_fromtext(keyname_base, &namebuf,
dns_rootname, 0, NULL);
if (result != ISC_R_SUCCESS)
return (result);
keyname = isc_mem_get(mctx, sizeof(*keyname));
if (keyname == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_name_init(keyname, NULL);
result = dns_name_dup(keyname_base, mctx, keyname);
if (result != ISC_R_SUCCESS)
goto cleanup;
/* Add the key data to the list */
keyent = isc_mem_get(mctx, sizeof(*keyent));
if (keyent == NULL) {
dns_name_free(keyname, mctx);
result = ISC_R_NOMEMORY;
goto cleanup;
}
keyent->keyname = keyname;
keyent->keydatabuf = keydatabuf;
ISC_LIST_APPEND(conf->trusted_keylist, keyent, link);
}
}
return (ISC_R_SUCCESS);
cleanup:
if (keydatabuf != NULL)
isc_buffer_free(&keydatabuf);
if (keyname != NULL)
isc_mem_put(mctx, keyname, sizeof(*keyname));
return (result);
}
isc_result_t
irs_dnsconf_load(isc_mem_t *mctx, const char *filename, irs_dnsconf_t **confp)
{
irs_dnsconf_t *conf;
cfg_parser_t *parser = NULL;
cfg_obj_t *cfgobj = NULL;
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(confp != NULL && *confp == NULL);
conf = isc_mem_get(mctx, sizeof(*conf));
if (conf == NULL)
return (ISC_R_NOMEMORY);
conf->mctx = mctx;
ISC_LIST_INIT(conf->trusted_keylist);
/*
* If the specified file does not exist, we'll simply with an empty
* configuration.
*/
if (!isc_file_exists(filename))
goto cleanup;
result = cfg_parser_create(mctx, NULL, &parser);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = cfg_parse_file(parser, filename, &cfg_type_dnsconf,
&cfgobj);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = configure_dnsseckeys(conf, cfgobj, dns_rdataclass_in);
cleanup:
if (parser != NULL) {
if (cfgobj != NULL)
cfg_obj_destroy(parser, &cfgobj);
cfg_parser_destroy(&parser);
}
conf->magic = IRS_DNSCONF_MAGIC;
if (result == ISC_R_SUCCESS)
*confp = conf;
else
irs_dnsconf_destroy(&conf);
return (result);
}
void
irs_dnsconf_destroy(irs_dnsconf_t **confp) {
irs_dnsconf_t *conf;
irs_dnsconf_dnskey_t *keyent;
REQUIRE(confp != NULL);
conf = *confp;
REQUIRE(IRS_DNSCONF_VALID(conf));
while ((keyent = ISC_LIST_HEAD(conf->trusted_keylist)) != NULL) {
ISC_LIST_UNLINK(conf->trusted_keylist, keyent, link);
isc_buffer_free(&keyent->keydatabuf);
dns_name_free(keyent->keyname, conf->mctx);
isc_mem_put(conf->mctx, keyent->keyname, sizeof(dns_name_t));
isc_mem_put(conf->mctx, keyent, sizeof(*keyent));
}
isc_mem_put(conf->mctx, conf, sizeof(*conf));
*confp = NULL;
}
irs_dnsconf_dnskeylist_t *
irs_dnsconf_gettrustedkeys(irs_dnsconf_t *conf) {
REQUIRE(IRS_DNSCONF_VALID(conf));
return (&conf->trusted_keylist);
}
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