diff options
Diffstat (limited to 'lib/irs/dnsconf.c')
| -rw-r--r-- | lib/irs/dnsconf.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/lib/irs/dnsconf.c b/lib/irs/dnsconf.c new file mode 100644 index 0000000..ee89af0 --- /dev/null +++ b/lib/irs/dnsconf.c @@ -0,0 +1,263 @@ +/* + * 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); +} |