/* $NetBSD: nsec3_50.c,v 1.3.4.1 2024/02/29 12:34:43 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * 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 https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ /* * Copyright (C) 2004 Nominet, Ltd. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND NOMINET DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* RFC 5155 */ #ifndef RDATA_GENERIC_NSEC3_50_C #define RDATA_GENERIC_NSEC3_50_C #include #include #define RRTYPE_NSEC3_ATTRIBUTES DNS_RDATATYPEATTR_DNSSEC static isc_result_t fromtext_nsec3(ARGS_FROMTEXT) { isc_token_t token; unsigned int flags; unsigned char hashalg; isc_buffer_t b; unsigned char buf[256]; REQUIRE(type == dns_rdatatype_nsec3); UNUSED(type); UNUSED(rdclass); UNUSED(callbacks); UNUSED(origin); UNUSED(options); /* Hash. */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, false)); RETTOK(dns_hashalg_fromtext(&hashalg, &token.value.as_textregion)); RETERR(uint8_tobuffer(hashalg, target)); /* Flags. */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number, false)); flags = token.value.as_ulong; if (flags > 255U) { RETTOK(ISC_R_RANGE); } RETERR(uint8_tobuffer(flags, target)); /* Iterations. */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number, false)); if (token.value.as_ulong > 0xffffU) { RETTOK(ISC_R_RANGE); } RETERR(uint16_tobuffer(token.value.as_ulong, target)); /* salt */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, false)); if (token.value.as_textregion.length > (255 * 2)) { RETTOK(DNS_R_TEXTTOOLONG); } if (strcmp(DNS_AS_STR(token), "-") == 0) { RETERR(uint8_tobuffer(0, target)); } else { RETERR(uint8_tobuffer(strlen(DNS_AS_STR(token)) / 2, target)); RETERR(isc_hex_decodestring(DNS_AS_STR(token), target)); } /* * Next hash a single base32hex word. */ RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, false)); isc_buffer_init(&b, buf, sizeof(buf)); RETTOK(isc_base32hexnp_decodestring(DNS_AS_STR(token), &b)); if (isc_buffer_usedlength(&b) > 0xffU) { RETTOK(ISC_R_RANGE); } RETERR(uint8_tobuffer(isc_buffer_usedlength(&b), target)); RETERR(mem_tobuffer(target, &buf, isc_buffer_usedlength(&b))); return (typemap_fromtext(lexer, target, true)); } static isc_result_t totext_nsec3(ARGS_TOTEXT) { isc_region_t sr; unsigned int i, j; unsigned char hash; unsigned char flags; char buf[sizeof("TYPE65535")]; uint32_t iterations; REQUIRE(rdata->type == dns_rdatatype_nsec3); REQUIRE(rdata->length != 0); dns_rdata_toregion(rdata, &sr); /* Hash */ hash = uint8_fromregion(&sr); isc_region_consume(&sr, 1); snprintf(buf, sizeof(buf), "%u ", hash); RETERR(str_totext(buf, target)); /* Flags */ flags = uint8_fromregion(&sr); isc_region_consume(&sr, 1); snprintf(buf, sizeof(buf), "%u ", flags); RETERR(str_totext(buf, target)); /* Iterations */ iterations = uint16_fromregion(&sr); isc_region_consume(&sr, 2); snprintf(buf, sizeof(buf), "%u ", iterations); RETERR(str_totext(buf, target)); /* Salt */ j = uint8_fromregion(&sr); isc_region_consume(&sr, 1); INSIST(j <= sr.length); if (j != 0) { i = sr.length; sr.length = j; RETERR(isc_hex_totext(&sr, 1, "", target)); sr.length = i - j; } else { RETERR(str_totext("-", target)); } if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) { RETERR(str_totext(" (", target)); } RETERR(str_totext(tctx->linebreak, target)); /* Next hash */ j = uint8_fromregion(&sr); isc_region_consume(&sr, 1); INSIST(j <= sr.length); i = sr.length; sr.length = j; RETERR(isc_base32hexnp_totext(&sr, 1, "", target)); sr.length = i - j; /* * Don't leave a trailing space when there's no typemap present. */ if (((tctx->flags & DNS_STYLEFLAG_MULTILINE) == 0) && (sr.length > 0)) { RETERR(str_totext(" ", target)); } RETERR(typemap_totext(&sr, tctx, target)); if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) { RETERR(str_totext(" )", target)); } return (ISC_R_SUCCESS); } static isc_result_t fromwire_nsec3(ARGS_FROMWIRE) { isc_region_t sr, rr; unsigned int saltlen, hashlen; REQUIRE(type == dns_rdatatype_nsec3); UNUSED(type); UNUSED(rdclass); UNUSED(options); UNUSED(dctx); isc_buffer_activeregion(source, &sr); rr = sr; /* hash(1), flags(1), iteration(2), saltlen(1) */ if (sr.length < 5U) { RETERR(DNS_R_FORMERR); } saltlen = sr.base[4]; isc_region_consume(&sr, 5); if (sr.length < saltlen) { RETERR(DNS_R_FORMERR); } isc_region_consume(&sr, saltlen); if (sr.length < 1U) { RETERR(DNS_R_FORMERR); } hashlen = sr.base[0]; isc_region_consume(&sr, 1); if (hashlen < 1 || sr.length < hashlen) { RETERR(DNS_R_FORMERR); } isc_region_consume(&sr, hashlen); RETERR(typemap_test(&sr, true)); RETERR(mem_tobuffer(target, rr.base, rr.length)); isc_buffer_forward(source, rr.length); return (ISC_R_SUCCESS); } static isc_result_t towire_nsec3(ARGS_TOWIRE) { isc_region_t sr; REQUIRE(rdata->type == dns_rdatatype_nsec3); REQUIRE(rdata->length != 0); UNUSED(cctx); dns_rdata_toregion(rdata, &sr); return (mem_tobuffer(target, sr.base, sr.length)); } static int compare_nsec3(ARGS_COMPARE) { isc_region_t r1; isc_region_t r2; REQUIRE(rdata1->type == rdata2->type); REQUIRE(rdata1->rdclass == rdata2->rdclass); REQUIRE(rdata1->type == dns_rdatatype_nsec3); REQUIRE(rdata1->length != 0); REQUIRE(rdata2->length != 0); dns_rdata_toregion(rdata1, &r1); dns_rdata_toregion(rdata2, &r2); return (isc_region_compare(&r1, &r2)); } static isc_result_t fromstruct_nsec3(ARGS_FROMSTRUCT) { dns_rdata_nsec3_t *nsec3 = source; isc_region_t region; REQUIRE(type == dns_rdatatype_nsec3); REQUIRE(nsec3 != NULL); REQUIRE(nsec3->common.rdtype == type); REQUIRE(nsec3->common.rdclass == rdclass); REQUIRE(nsec3->typebits != NULL || nsec3->len == 0); REQUIRE(nsec3->hash == dns_hash_sha1); UNUSED(type); UNUSED(rdclass); RETERR(uint8_tobuffer(nsec3->hash, target)); RETERR(uint8_tobuffer(nsec3->flags, target)); RETERR(uint16_tobuffer(nsec3->iterations, target)); RETERR(uint8_tobuffer(nsec3->salt_length, target)); RETERR(mem_tobuffer(target, nsec3->salt, nsec3->salt_length)); RETERR(uint8_tobuffer(nsec3->next_length, target)); RETERR(mem_tobuffer(target, nsec3->next, nsec3->next_length)); region.base = nsec3->typebits; region.length = nsec3->len; RETERR(typemap_test(®ion, true)); return (mem_tobuffer(target, nsec3->typebits, nsec3->len)); } static isc_result_t tostruct_nsec3(ARGS_TOSTRUCT) { isc_region_t region; dns_rdata_nsec3_t *nsec3 = target; REQUIRE(rdata->type == dns_rdatatype_nsec3); REQUIRE(nsec3 != NULL); REQUIRE(rdata->length != 0); nsec3->common.rdclass = rdata->rdclass; nsec3->common.rdtype = rdata->type; ISC_LINK_INIT(&nsec3->common, link); region.base = rdata->data; region.length = rdata->length; nsec3->hash = uint8_consume_fromregion(®ion); nsec3->flags = uint8_consume_fromregion(®ion); nsec3->iterations = uint16_consume_fromregion(®ion); nsec3->salt_length = uint8_consume_fromregion(®ion); INSIST(nsec3->salt_length <= region.length); nsec3->salt = mem_maybedup(mctx, region.base, nsec3->salt_length); if (nsec3->salt == NULL) { return (ISC_R_NOMEMORY); } isc_region_consume(®ion, nsec3->salt_length); nsec3->next_length = uint8_consume_fromregion(®ion); INSIST(nsec3->next_length <= region.length); nsec3->next = mem_maybedup(mctx, region.base, nsec3->next_length); if (nsec3->next == NULL) { goto cleanup; } isc_region_consume(®ion, nsec3->next_length); nsec3->len = region.length; nsec3->typebits = mem_maybedup(mctx, region.base, region.length); if (nsec3->typebits == NULL) { goto cleanup; } nsec3->mctx = mctx; return (ISC_R_SUCCESS); cleanup: if (nsec3->next != NULL) { isc_mem_free(mctx, nsec3->next); } isc_mem_free(mctx, nsec3->salt); return (ISC_R_NOMEMORY); } static void freestruct_nsec3(ARGS_FREESTRUCT) { dns_rdata_nsec3_t *nsec3 = source; REQUIRE(nsec3 != NULL); REQUIRE(nsec3->common.rdtype == dns_rdatatype_nsec3); if (nsec3->mctx == NULL) { return; } if (nsec3->salt != NULL) { isc_mem_free(nsec3->mctx, nsec3->salt); } if (nsec3->next != NULL) { isc_mem_free(nsec3->mctx, nsec3->next); } if (nsec3->typebits != NULL) { isc_mem_free(nsec3->mctx, nsec3->typebits); } nsec3->mctx = NULL; } static isc_result_t additionaldata_nsec3(ARGS_ADDLDATA) { REQUIRE(rdata->type == dns_rdatatype_nsec3); UNUSED(rdata); UNUSED(owner); UNUSED(add); UNUSED(arg); return (ISC_R_SUCCESS); } static isc_result_t digest_nsec3(ARGS_DIGEST) { isc_region_t r; REQUIRE(rdata->type == dns_rdatatype_nsec3); dns_rdata_toregion(rdata, &r); return ((digest)(arg, &r)); } static bool checkowner_nsec3(ARGS_CHECKOWNER) { unsigned char owner[NSEC3_MAX_HASH_LENGTH]; isc_buffer_t buffer; dns_label_t label; REQUIRE(type == dns_rdatatype_nsec3); UNUSED(type); UNUSED(rdclass); UNUSED(wildcard); /* * First label is a base32hex string without padding. */ dns_name_getlabel(name, 0, &label); isc_region_consume(&label, 1); isc_buffer_init(&buffer, owner, sizeof(owner)); if (isc_base32hexnp_decoderegion(&label, &buffer) == ISC_R_SUCCESS) { return (true); } return (false); } static bool checknames_nsec3(ARGS_CHECKNAMES) { REQUIRE(rdata->type == dns_rdatatype_nsec3); UNUSED(rdata); UNUSED(owner); UNUSED(bad); return (true); } static int casecompare_nsec3(ARGS_COMPARE) { return (compare_nsec3(rdata1, rdata2)); } #endif /* RDATA_GENERIC_NSEC3_50_C */