Return to nxt_30.c CVS log

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Import bind 9.14.8 (security fix -- limits on concurrent TCP queries)

        --- 9.14.8 released ---

5315.	[bug]		Apply the inital RRSIG expiration spread fixed
			to all dynamically created records in the zone
			including NSEC3. Also fix the signature clusters
			when the server has been offline for prolonged
			period of times. [GL #1256]

5314.	[func]		Added a new statistics variable "tcp-highwater"
			that reports the maximum number of simultaneous TCP
			clients BIND has handled while running. [GL #1206]

5313.	[bug]		The default GeoIP2 database location did not match
			the ARM.  'named -V' now reports the default
			location. [GL #1301]

5310.	[bug]		TCP failures were affecting EDNS statistics. [GL #1059]

5308.	[bug]		Don't log DNS_R_UNCHANGED from sync_secure_journal()
			at ERROR level in receive_secure_serial(). [GL #1288]

5307.	[bug]		Fix hang when named-compilezone output is sent to pipe.
			Thanks to Tony Finch. [GL !2481]

5306.	[security]	Set a limit on the number of concurrently served
			pipelined TCP queries. (CVE-2019-6477) [GL #1264]

5305.	[bug]		NSEC Aggressive Cache ("synth-from-dnssec") has been
			disabled by default because it was found to have
			a significant performance impact on the recursive
			service. [GL #1265]

5304.	[bug]		"dnskey-sig-validity 0;" was not being accepted.
			[GL #876]

5302.	[bug]		Fix checking that "dnstap-output" is defined when
			"dnstap" is specified in a view. [GL #1281]

5301.	[bug]		Detect partial prefixes / incomplete IPv4 address in
			acls. [GL #1143]

/*	$NetBSD: nxt_30.c,v 1.1.1.3 2019/11/24 19:58:06 christos Exp $	*/

/*
 * 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.
 */

/* RFC2535 */

#ifndef RDATA_GENERIC_NXT_30_C
#define RDATA_GENERIC_NXT_30_C

/*
 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON
 * because we must be able to handle a parent/child NXT pair.
 */
#define RRTYPE_NXT_ATTRIBUTES (0)

static inline isc_result_t
fromtext_nxt(ARGS_FROMTEXT) {
	isc_token_t token;
	dns_name_t name;
	isc_buffer_t buffer;
	char *e;
	unsigned char bm[8*1024]; /* 64k bits */
	dns_rdatatype_t covered;
	dns_rdatatype_t maxcovered = 0;
	bool first = true;
	long n;

	REQUIRE(type == dns_rdatatype_nxt);

	UNUSED(type);
	UNUSED(rdclass);
	UNUSED(callbacks);

	/*
	 * Next domain.
	 */
	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
				      false));
	dns_name_init(&name, NULL);
	buffer_fromregion(&buffer, &token.value.as_region);
	if (origin == NULL)
		origin = dns_rootname;
	RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));

	memset(bm, 0, sizeof(bm));
	do {
		RETERR(isc_lex_getmastertoken(lexer, &token,
					      isc_tokentype_string, true));
		if (token.type != isc_tokentype_string)
			break;
		n = strtol(DNS_AS_STR(token), &e, 10);
		if (e != DNS_AS_STR(token) && *e == '\0') {
			covered = (dns_rdatatype_t)n;
		} else if (dns_rdatatype_fromtext(&covered,
				&token.value.as_textregion) == DNS_R_UNKNOWN)
			RETTOK(DNS_R_UNKNOWN);
		/*
		 * NXT is only specified for types 1..127.
		 */
		if (covered < 1 || covered > 127)
			return (ISC_R_RANGE);
		if (first || covered > maxcovered)
			maxcovered = covered;
		first = false;
		bm[covered/8] |= (0x80>>(covered%8));
	} while (1);
	isc_lex_ungettoken(lexer, &token);
	if (first)
		return (ISC_R_SUCCESS);
	n = (maxcovered + 8) / 8;
	return (mem_tobuffer(target, bm, n));
}

static inline isc_result_t
totext_nxt(ARGS_TOTEXT) {
	isc_region_t sr;
	unsigned int i, j;
	dns_name_t name;
	dns_name_t prefix;
	bool sub;

	REQUIRE(rdata->type == dns_rdatatype_nxt);
	REQUIRE(rdata->length != 0);

	dns_name_init(&name, NULL);
	dns_name_init(&prefix, NULL);
	dns_rdata_toregion(rdata, &sr);
	dns_name_fromregion(&name, &sr);
	isc_region_consume(&sr, name_length(&name));
	sub = name_prefix(&name, tctx->origin, &prefix);
	RETERR(dns_name_totext(&prefix, sub, target));

	for (i = 0; i < sr.length; i++) {
		if (sr.base[i] != 0)
			for (j = 0; j < 8; j++)
				if ((sr.base[i] & (0x80 >> j)) != 0) {
					dns_rdatatype_t t = i * 8 + j;
					RETERR(str_totext(" ", target));
					if (dns_rdatatype_isknown(t)) {
						RETERR(dns_rdatatype_totext(t,
								      target));
					} else {
						char buf[sizeof("65535")];
						snprintf(buf, sizeof(buf),
							 "%u", t);
						RETERR(str_totext(buf,
								  target));
					}
				}
	}
	return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_nxt(ARGS_FROMWIRE) {
	isc_region_t sr;
	dns_name_t name;

	REQUIRE(type == dns_rdatatype_nxt);

	UNUSED(type);
	UNUSED(rdclass);

	dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

	dns_name_init(&name, NULL);
	RETERR(dns_name_fromwire(&name, source, dctx, options, target));

	isc_buffer_activeregion(source, &sr);
	if (sr.length > 0 && (sr.base[0] & 0x80) == 0 &&
	    ((sr.length > 16) || sr.base[sr.length - 1] == 0))
		return (DNS_R_BADBITMAP);
	RETERR(mem_tobuffer(target, sr.base, sr.length));
	isc_buffer_forward(source, sr.length);
	return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_nxt(ARGS_TOWIRE) {
	isc_region_t sr;
	dns_name_t name;
	dns_offsets_t offsets;

	REQUIRE(rdata->type == dns_rdatatype_nxt);
	REQUIRE(rdata->length != 0);

	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
	dns_name_init(&name, offsets);
	dns_rdata_toregion(rdata, &sr);
	dns_name_fromregion(&name, &sr);
	isc_region_consume(&sr, name_length(&name));
	RETERR(dns_name_towire(&name, cctx, target));

	return (mem_tobuffer(target, sr.base, sr.length));
}

static inline int
compare_nxt(ARGS_COMPARE) {
	isc_region_t r1;
	isc_region_t r2;
	dns_name_t name1;
	dns_name_t name2;
	int order;

	REQUIRE(rdata1->type == rdata2->type);
	REQUIRE(rdata1->rdclass == rdata2->rdclass);
	REQUIRE(rdata1->type == dns_rdatatype_nxt);
	REQUIRE(rdata1->length != 0);
	REQUIRE(rdata2->length != 0);

	dns_name_init(&name1, NULL);
	dns_name_init(&name2, NULL);
	dns_rdata_toregion(rdata1, &r1);
	dns_rdata_toregion(rdata2, &r2);
	dns_name_fromregion(&name1, &r1);
	dns_name_fromregion(&name2, &r2);
	order = dns_name_rdatacompare(&name1, &name2);
	if (order != 0)
		return (order);

	isc_region_consume(&r1, name_length(&name1));
	isc_region_consume(&r2, name_length(&name2));

	return (isc_region_compare(&r1, &r2));
}

static inline isc_result_t
fromstruct_nxt(ARGS_FROMSTRUCT) {
	dns_rdata_nxt_t *nxt = source;
	isc_region_t region;

	REQUIRE(type == dns_rdatatype_nxt);
	REQUIRE(nxt != NULL);
	REQUIRE(nxt->common.rdtype == type);
	REQUIRE(nxt->common.rdclass == rdclass);
	REQUIRE(nxt->typebits != NULL || nxt->len == 0);
	if (nxt->typebits != NULL && (nxt->typebits[0] & 0x80) == 0) {
		REQUIRE(nxt->len <= 16);
		REQUIRE(nxt->typebits[nxt->len - 1] != 0);
	}

	UNUSED(type);
	UNUSED(rdclass);

	dns_name_toregion(&nxt->next, &region);
	RETERR(isc_buffer_copyregion(target, &region));

	return (mem_tobuffer(target, nxt->typebits, nxt->len));
}

static inline isc_result_t
tostruct_nxt(ARGS_TOSTRUCT) {
	isc_region_t region;
	dns_rdata_nxt_t *nxt = target;
	dns_name_t name;

	REQUIRE(rdata->type == dns_rdatatype_nxt);
	REQUIRE(nxt != NULL);
	REQUIRE(rdata->length != 0);

	nxt->common.rdclass = rdata->rdclass;
	nxt->common.rdtype = rdata->type;
	ISC_LINK_INIT(&nxt->common, link);

	dns_name_init(&name, NULL);
	dns_rdata_toregion(rdata, &region);
	dns_name_fromregion(&name, &region);
	isc_region_consume(&region, name_length(&name));
	dns_name_init(&nxt->next, NULL);
	RETERR(name_duporclone(&name, mctx, &nxt->next));

	nxt->len = region.length;
	nxt->typebits = mem_maybedup(mctx, region.base, region.length);
	if (nxt->typebits == NULL)
		goto cleanup;

	nxt->mctx = mctx;
	return (ISC_R_SUCCESS);

 cleanup:
	if (mctx != NULL)
		dns_name_free(&nxt->next, mctx);
	return (ISC_R_NOMEMORY);
}

static inline void
freestruct_nxt(ARGS_FREESTRUCT) {
	dns_rdata_nxt_t *nxt = source;

	REQUIRE(nxt != NULL);
	REQUIRE(nxt->common.rdtype == dns_rdatatype_nxt);

	if (nxt->mctx == NULL)
		return;

	dns_name_free(&nxt->next, nxt->mctx);
	if (nxt->typebits != NULL)
		isc_mem_free(nxt->mctx, nxt->typebits);
	nxt->mctx = NULL;
}

static inline isc_result_t
additionaldata_nxt(ARGS_ADDLDATA) {
	REQUIRE(rdata->type == dns_rdatatype_nxt);

	UNUSED(rdata);
	UNUSED(add);
	UNUSED(arg);

	return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_nxt(ARGS_DIGEST) {
	isc_region_t r;
	dns_name_t name;
	isc_result_t result;

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	dns_rdata_toregion(rdata, &r);
	dns_name_init(&name, NULL);
	dns_name_fromregion(&name, &r);
	result = dns_name_digest(&name, digest, arg);
	if (result != ISC_R_SUCCESS)
		return (result);
	isc_region_consume(&r, name_length(&name));

	return ((digest)(arg, &r));
}

static inline bool
checkowner_nxt(ARGS_CHECKOWNER) {

	REQUIRE(type == dns_rdatatype_nxt);

	UNUSED(name);
	UNUSED(type);
	UNUSED(rdclass);
	UNUSED(wildcard);

	return (true);
}

static inline bool
checknames_nxt(ARGS_CHECKNAMES) {

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	UNUSED(rdata);
	UNUSED(owner);
	UNUSED(bad);

	return (true);
}

static inline int
casecompare_nxt(ARGS_COMPARE) {
	return (compare_nxt(rdata1, rdata2));
}
#endif	/* RDATA_GENERIC_NXT_30_C */