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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or 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 ISC 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.
*/
/* $Id: nsec3_50.c,v 1.7 2020/02/24 17:45:26 florian Exp $ */
/*
* 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 <isc/base32.h>
#define RRTYPE_NSEC3_ATTRIBUTES DNS_RDATATYPEATTR_DNSSEC
static inline 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 inline 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 (sr.length < hashlen)
RETERR(DNS_R_FORMERR);
isc_region_consume(&sr, hashlen);
RETERR(typemap_test(&sr, ISC_TRUE));
RETERR(mem_tobuffer(target, rr.base, rr.length));
isc_buffer_forward(source, rr.length);
return (ISC_R_SUCCESS);
}
static inline 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));
}
#define NSEC3_MAX_HASH_LENGTH 155
static inline isc_boolean_t
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 (ISC_TRUE);
return (ISC_FALSE);
}
#endif /* RDATA_GENERIC_NSEC3_50_C */
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