Example #1
0
void
ns_xfr_start(ns_client_t *client, dns_rdatatype_t reqtype) {
	isc_result_t result;
	dns_name_t *question_name;
	dns_rdataset_t *question_rdataset;
	dns_zone_t *zone = NULL, *raw = NULL, *mayberaw;
	dns_db_t *db = NULL;
	dns_dbversion_t *ver = NULL;
	dns_rdataclass_t question_class;
	rrstream_t *soa_stream = NULL;
	rrstream_t *data_stream = NULL;
	rrstream_t *stream = NULL;
	dns_difftuple_t *current_soa_tuple = NULL;
	dns_name_t *soa_name;
	dns_rdataset_t *soa_rdataset;
	dns_rdata_t soa_rdata = DNS_RDATA_INIT;
	isc_boolean_t have_soa = ISC_FALSE;
	const char *mnemonic = NULL;
	isc_mem_t *mctx = client->mctx;
	dns_message_t *request = client->message;
	xfrout_ctx_t *xfr = NULL;
	isc_quota_t *quota = NULL;
	dns_transfer_format_t format = client->view->transfer_format;
	isc_netaddr_t na;
	dns_peer_t *peer = NULL;
	isc_buffer_t *tsigbuf = NULL;
	char *journalfile;
	char msg[NS_CLIENT_ACLMSGSIZE("zone transfer")];
	char keyname[DNS_NAME_FORMATSIZE];
	isc_boolean_t is_poll = ISC_FALSE;
	isc_boolean_t is_dlz = ISC_FALSE;
	isc_boolean_t is_ixfr = ISC_FALSE;
	isc_uint32_t begin_serial = 0, current_serial;

	switch (reqtype) {
	case dns_rdatatype_axfr:
		mnemonic = "AXFR";
		break;
	case dns_rdatatype_ixfr:
		mnemonic = "IXFR";
		break;
	default:
		INSIST(0);
		break;
	}

	ns_client_log(client,
		      DNS_LOGCATEGORY_XFER_OUT, NS_LOGMODULE_XFER_OUT,
		      ISC_LOG_DEBUG(6), "%s request", mnemonic);
	/*
	 * Apply quota.
	 */
	result = isc_quota_attach(&ns_g_server->xfroutquota, &quota);
	if (result != ISC_R_SUCCESS) {
		isc_log_write(XFROUT_COMMON_LOGARGS, ISC_LOG_WARNING,
			      "%s request denied: %s", mnemonic,
			      isc_result_totext(result));
		goto failure;
	}

	/*
	 * Interpret the question section.
	 */
	result = dns_message_firstname(request, DNS_SECTION_QUESTION);
	INSIST(result == ISC_R_SUCCESS);

	/*
	 * The question section must contain exactly one question, and
	 * it must be for AXFR/IXFR as appropriate.
	 */
	question_name = NULL;
	dns_message_currentname(request, DNS_SECTION_QUESTION, &question_name);
	question_rdataset = ISC_LIST_HEAD(question_name->list);
	question_class = question_rdataset->rdclass;
	INSIST(question_rdataset->type == reqtype);
	if (ISC_LIST_NEXT(question_rdataset, link) != NULL)
		FAILC(DNS_R_FORMERR, "multiple questions");
	result = dns_message_nextname(request, DNS_SECTION_QUESTION);
	if (result != ISC_R_NOMORE)
		FAILC(DNS_R_FORMERR, "multiple questions");

	result = dns_zt_find(client->view->zonetable, question_name, 0, NULL,
			     &zone);

	if (result != ISC_R_SUCCESS) {
		/*
		 * Normal zone table does not have a match.
		 * Try the DLZ database
		 */
		// Temporary: only searching the first DLZ database
		if (! ISC_LIST_EMPTY(client->view->dlz_searched)) {
			result = dns_dlzallowzonexfr(client->view,
						     question_name,
						     &client->peeraddr,
						     &db);

			pfilter_notify(result, client, "zonexfr");
			if (result == ISC_R_NOPERM) {
				char _buf1[DNS_NAME_FORMATSIZE];
				char _buf2[DNS_RDATACLASS_FORMATSIZE];

				result = DNS_R_REFUSED;
				dns_name_format(question_name, _buf1,
						sizeof(_buf1));
				dns_rdataclass_format(question_class,
						      _buf2, sizeof(_buf2));
				ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
					      NS_LOGMODULE_XFER_OUT,
					      ISC_LOG_ERROR,
					      "zone transfer '%s/%s' denied",
					      _buf1, _buf2);
				goto failure;
			}
			if (result != ISC_R_SUCCESS)
				FAILQ(DNS_R_NOTAUTH, "non-authoritative zone",
				      question_name, question_class);
			is_dlz = ISC_TRUE;
		} else {
			/*
			 * not DLZ and not in normal zone table, we are
			 * not authoritative
			 */
			FAILQ(DNS_R_NOTAUTH, "non-authoritative zone",
			      question_name, question_class);
		}
	} else {
		/* zone table has a match */
		switch(dns_zone_gettype(zone)) {
			/* Master and slave zones are OK for transfer. */
			case dns_zone_master:
			case dns_zone_slave:
			case dns_zone_dlz:
				break;
			default:
				FAILQ(DNS_R_NOTAUTH, "non-authoritative zone",
				      question_name, question_class);
			}
		CHECK(dns_zone_getdb(zone, &db));
		dns_db_currentversion(db, &ver);
	}

	xfrout_log1(client, question_name, question_class, ISC_LOG_DEBUG(6),
		    "%s question section OK", mnemonic);

	/*
	 * Check the authority section.  Look for a SOA record with
	 * the same name and class as the question.
	 */
	for (result = dns_message_firstname(request, DNS_SECTION_AUTHORITY);
	     result == ISC_R_SUCCESS;
	     result = dns_message_nextname(request, DNS_SECTION_AUTHORITY))
	{
		soa_name = NULL;
		dns_message_currentname(request, DNS_SECTION_AUTHORITY,
					&soa_name);

		/*
		 * Ignore data whose owner name is not the zone apex.
		 */
		if (! dns_name_equal(soa_name, question_name))
			continue;

		for (soa_rdataset = ISC_LIST_HEAD(soa_name->list);
		     soa_rdataset != NULL;
		     soa_rdataset = ISC_LIST_NEXT(soa_rdataset, link))
		{
			/*
			 * Ignore non-SOA data.
			 */
			if (soa_rdataset->type != dns_rdatatype_soa)
				continue;
			if (soa_rdataset->rdclass != question_class)
				continue;

			CHECK(dns_rdataset_first(soa_rdataset));
			dns_rdataset_current(soa_rdataset, &soa_rdata);
			result = dns_rdataset_next(soa_rdataset);
			if (result == ISC_R_SUCCESS)
				FAILC(DNS_R_FORMERR,
				      "IXFR authority section "
				      "has multiple SOAs");
			have_soa = ISC_TRUE;
			goto got_soa;
		}
	}
 got_soa:
	if (result != ISC_R_NOMORE)
		CHECK(result);

	xfrout_log1(client, question_name, question_class, ISC_LOG_DEBUG(6),
		    "%s authority section OK", mnemonic);

	/*
	 * If not a DLZ zone, decide whether to allow this transfer.
	 */
	if (!is_dlz) {
		ns_client_aclmsg("zone transfer", question_name, reqtype,
				 client->view->rdclass, msg, sizeof(msg));
		CHECK(ns_client_checkacl(client, NULL, msg,
					 dns_zone_getxfracl(zone),
					 ISC_TRUE, ISC_LOG_ERROR));
	}

	/*
	 * AXFR over UDP is not possible.
	 */
	if (reqtype == dns_rdatatype_axfr &&
	    (client->attributes & NS_CLIENTATTR_TCP) == 0)
		FAILC(DNS_R_FORMERR, "attempted AXFR over UDP");

	/*
	 * Look up the requesting server in the peer table.
	 */
	isc_netaddr_fromsockaddr(&na, &client->peeraddr);
	(void)dns_peerlist_peerbyaddr(client->view->peers, &na, &peer);

	/*
	 * Decide on the transfer format (one-answer or many-answers).
	 */
	if (peer != NULL)
		(void)dns_peer_gettransferformat(peer, &format);

	/*
	 * Get a dynamically allocated copy of the current SOA.
	 */
	if (is_dlz)
		dns_db_currentversion(db, &ver);

	CHECK(dns_db_createsoatuple(db, ver, mctx, DNS_DIFFOP_EXISTS,
				    &current_soa_tuple));

	current_serial = dns_soa_getserial(&current_soa_tuple->rdata);
	if (reqtype == dns_rdatatype_ixfr) {
		isc_boolean_t provide_ixfr;

		/*
		 * Outgoing IXFR may have been disabled for this peer
		 * or globally.
		 */
		provide_ixfr = client->view->provideixfr;
		if (peer != NULL)
			(void) dns_peer_getprovideixfr(peer, &provide_ixfr);
		if (provide_ixfr == ISC_FALSE)
			goto axfr_fallback;

		if (! have_soa)
			FAILC(DNS_R_FORMERR,
			      "IXFR request missing SOA");

		begin_serial = dns_soa_getserial(&soa_rdata);

		/*
		 * RFC1995 says "If an IXFR query with the same or
		 * newer version number than that of the server
		 * is received, it is replied to with a single SOA
		 * record of the server's current version, just as
		 * in AXFR".  The claim about AXFR is incorrect,
		 * but other than that, we do as the RFC says.
		 *
		 * Sending a single SOA record is also how we refuse
		 * IXFR over UDP (currently, we always do).
		 */
		if (DNS_SERIAL_GE(begin_serial, current_serial) ||
		    (client->attributes & NS_CLIENTATTR_TCP) == 0)
		{
			CHECK(soa_rrstream_create(mctx, db, ver, &stream));
			is_poll = ISC_TRUE;
			goto have_stream;
		}
		journalfile = is_dlz ? NULL : dns_zone_getjournal(zone);
		if (journalfile != NULL)
			result = ixfr_rrstream_create(mctx,
						      journalfile,
						      begin_serial,
						      current_serial,
						      &data_stream);
		else
			result = ISC_R_NOTFOUND;
		if (result == ISC_R_NOTFOUND ||
		    result == ISC_R_RANGE) {
			xfrout_log1(client, question_name, question_class,
				    ISC_LOG_DEBUG(4),
				    "IXFR version not in journal, "
				    "falling back to AXFR");
			mnemonic = "AXFR-style IXFR";
			goto axfr_fallback;
		}
		CHECK(result);
		is_ixfr = ISC_TRUE;
	} else {
	axfr_fallback:
		CHECK(axfr_rrstream_create(mctx, db, ver, &data_stream));
	}

	/*
	 * Bracket the data stream with SOAs.
	 */
	CHECK(soa_rrstream_create(mctx, db, ver, &soa_stream));
	CHECK(compound_rrstream_create(mctx, &soa_stream, &data_stream,
				       &stream));
	soa_stream = NULL;
	data_stream = NULL;

 have_stream:
	CHECK(dns_message_getquerytsig(request, mctx, &tsigbuf));
	/*
	 * Create the xfrout context object.  This transfers the ownership
	 * of "stream", "db", "ver", and "quota" to the xfrout context object.
	 */



	if (is_dlz)
		CHECK(xfrout_ctx_create(mctx, client, request->id,
					question_name, reqtype, question_class,
					zone, db, ver, quota, stream,
					dns_message_gettsigkey(request),
					tsigbuf,
					3600,
					3600,
					(format == dns_many_answers) ?
					ISC_TRUE : ISC_FALSE,
					&xfr));
	else
		CHECK(xfrout_ctx_create(mctx, client, request->id,
					question_name, reqtype, question_class,
					zone, db, ver, quota, stream,
					dns_message_gettsigkey(request),
					tsigbuf,
					dns_zone_getmaxxfrout(zone),
					dns_zone_getidleout(zone),
					(format == dns_many_answers) ?
					ISC_TRUE : ISC_FALSE,
					&xfr));

	xfr->mnemonic = mnemonic;
	stream = NULL;
	quota = NULL;

	CHECK(xfr->stream->methods->first(xfr->stream));

	if (xfr->tsigkey != NULL)
		dns_name_format(&xfr->tsigkey->name, keyname, sizeof(keyname));
	else
		keyname[0] = '\0';
	if (is_poll)
		xfrout_log1(client, question_name, question_class,
			    ISC_LOG_DEBUG(1), "IXFR poll up to date%s%s",
			    (xfr->tsigkey != NULL) ? ": TSIG " : "", keyname);
	else if (is_ixfr)
		xfrout_log1(client, question_name, question_class,
			    ISC_LOG_INFO, "%s started%s%s (serial %u -> %u)",
			    mnemonic, (xfr->tsigkey != NULL) ? ": TSIG " : "",
			    keyname, begin_serial, current_serial);
	else
		xfrout_log1(client, question_name, question_class,
			    ISC_LOG_INFO, "%s started%s%s (serial %u)",
			    mnemonic, (xfr->tsigkey != NULL) ? ": TSIG " : "",
			    keyname, current_serial);


	if (zone != NULL) {
		dns_zone_getraw(zone, &raw);
		mayberaw = (raw != NULL) ? raw : zone;
		if ((client->attributes & NS_CLIENTATTR_WANTEXPIRE) != 0 &&
		    dns_zone_gettype(mayberaw) == dns_zone_slave) {
			isc_time_t expiretime;
			isc_uint32_t secs;
			dns_zone_getexpiretime(zone, &expiretime);
			secs = isc_time_seconds(&expiretime);
			if (secs >= client->now && result == ISC_R_SUCCESS) {
				client->attributes |= NS_CLIENTATTR_HAVEEXPIRE;
				client->expire = secs - client->now;
			}
		}
		if (raw != NULL)
			dns_zone_detach(&raw);
	}

	/*
	 * Hand the context over to sendstream().  Set xfr to NULL;
	 * sendstream() is responsible for either passing the
	 * context on to a later event handler or destroying it.
	 */
	sendstream(xfr);
	xfr = NULL;

	result = ISC_R_SUCCESS;

 failure:
	if (result == DNS_R_REFUSED)
		inc_stats(zone, dns_nsstatscounter_xfrrej);
	if (quota != NULL)
		isc_quota_detach(&quota);
	if (current_soa_tuple != NULL)
		dns_difftuple_free(&current_soa_tuple);
	if (stream != NULL)
		stream->methods->destroy(&stream);
	if (soa_stream != NULL)
		soa_stream->methods->destroy(&soa_stream);
	if (data_stream != NULL)
		data_stream->methods->destroy(&data_stream);
	if (ver != NULL)
		dns_db_closeversion(db, &ver, ISC_FALSE);
	if (db != NULL)
		dns_db_detach(&db);
	if (zone != NULL)
		dns_zone_detach(&zone);
	/* XXX kludge */
	if (xfr != NULL) {
		xfrout_fail(xfr, result, "setting up zone transfer");
	} else if (result != ISC_R_SUCCESS) {
		ns_client_log(client, DNS_LOGCATEGORY_XFER_OUT,
			      NS_LOGMODULE_XFER_OUT,
			      ISC_LOG_DEBUG(3), "zone transfer setup failed");
		ns_client_error(client, result);
	}
}
Example #2
0
isc_result_t
dns_tsig_sign(dns_message_t *msg) {
	dns_tsigkey_t *key;
	dns_rdata_any_tsig_t tsig, querytsig;
	unsigned char data[128];
	isc_buffer_t databuf, sigbuf;
	isc_buffer_t *dynbuf;
	dns_name_t *owner;
	dns_rdata_t *rdata = NULL;
	dns_rdatalist_t *datalist;
	dns_rdataset_t *dataset;
	isc_region_t r;
	isc_stdtime_t now;
	isc_mem_t *mctx;
	dst_context_t *ctx = NULL;
	isc_result_t ret;
	unsigned char badtimedata[BADTIMELEN];
	unsigned int sigsize = 0;
	isc_boolean_t response = is_response(msg);

	REQUIRE(msg != NULL);
	REQUIRE(VALID_TSIG_KEY(dns_message_gettsigkey(msg)));

	/*
	 * If this is a response, there should be a query tsig.
	 */
	if (response && msg->querytsig == NULL)
		return (DNS_R_EXPECTEDTSIG);

	dynbuf = NULL;

	mctx = msg->mctx;
	key = dns_message_gettsigkey(msg);

	tsig.mctx = mctx;
	tsig.common.rdclass = dns_rdataclass_any;
	tsig.common.rdtype = dns_rdatatype_tsig;
	ISC_LINK_INIT(&tsig.common, link);
	dns_name_init(&tsig.algorithm, NULL);
	dns_name_clone(key->algorithm, &tsig.algorithm);

	isc_stdtime_get(&now);
	tsig.timesigned = now + msg->timeadjust;
	tsig.fudge = DNS_TSIG_FUDGE;

	tsig.originalid = msg->id;

	isc_buffer_init(&databuf, data, sizeof(data));

	if (response)
		tsig.error = msg->querytsigstatus;
	else
		tsig.error = dns_rcode_noerror;

	if (tsig.error != dns_tsigerror_badtime) {
		tsig.otherlen = 0;
		tsig.other = NULL;
	} else {
		isc_buffer_t otherbuf;

		tsig.otherlen = BADTIMELEN;
		tsig.other = badtimedata;
		isc_buffer_init(&otherbuf, tsig.other, tsig.otherlen);
		isc_buffer_putuint48(&otherbuf, tsig.timesigned);
	}

	if (key->key != NULL && tsig.error != dns_tsigerror_badsig) {
		unsigned char header[DNS_MESSAGE_HEADERLEN];
		isc_buffer_t headerbuf;
		isc_uint16_t digestbits;

		ret = dst_context_create3(key->key, mctx,
					  DNS_LOGCATEGORY_DNSSEC,
					  ISC_TRUE, &ctx);
		if (ret != ISC_R_SUCCESS)
			return (ret);

		/*
		 * If this is a response, digest the query signature.
		 */
		if (response) {
			dns_rdata_t querytsigrdata = DNS_RDATA_INIT;

			ret = dns_rdataset_first(msg->querytsig);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
			dns_rdataset_current(msg->querytsig, &querytsigrdata);
			ret = dns_rdata_tostruct(&querytsigrdata, &querytsig,
						 NULL);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
			isc_buffer_putuint16(&databuf, querytsig.siglen);
			if (isc_buffer_availablelength(&databuf) <
			    querytsig.siglen) {
				ret = ISC_R_NOSPACE;
				goto cleanup_context;
			}
			isc_buffer_putmem(&databuf, querytsig.signature,
					  querytsig.siglen);
			isc_buffer_usedregion(&databuf, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
		}
#if defined(__clang__)  && \
       ( __clang_major__ < 3 || \
	(__clang_major__ == 3 && __clang_minor__ < 2) || \
	(__clang_major__ == 4 && __clang_minor__ < 2))
	/* false positive: http://llvm.org/bugs/show_bug.cgi?id=14461 */
		else memset(&querytsig, 0, sizeof(querytsig));
#endif

		/*
		 * Digest the header.
		 */
		isc_buffer_init(&headerbuf, header, sizeof(header));
		dns_message_renderheader(msg, &headerbuf);
		isc_buffer_usedregion(&headerbuf, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		/*
		 * Digest the remainder of the message.
		 */
		isc_buffer_usedregion(msg->buffer, &r);
		isc_region_consume(&r, DNS_MESSAGE_HEADERLEN);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		if (msg->tcp_continuation == 0) {
			/*
			 * Digest the name, class, ttl, alg.
			 */
			dns_name_toregion(&key->name, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

			isc_buffer_clear(&databuf);
			isc_buffer_putuint16(&databuf, dns_rdataclass_any);
			isc_buffer_putuint32(&databuf, 0); /* ttl */
			isc_buffer_usedregion(&databuf, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

			dns_name_toregion(&tsig.algorithm, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

		}
		/* Digest the timesigned and fudge */
		isc_buffer_clear(&databuf);
		if (tsig.error == dns_tsigerror_badtime) {
			INSIST(response);
			tsig.timesigned = querytsig.timesigned;
		}
		isc_buffer_putuint48(&databuf, tsig.timesigned);
		isc_buffer_putuint16(&databuf, tsig.fudge);
		isc_buffer_usedregion(&databuf, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		if (msg->tcp_continuation == 0) {
			/*
			 * Digest the error and other data length.
			 */
			isc_buffer_clear(&databuf);
			isc_buffer_putuint16(&databuf, tsig.error);
			isc_buffer_putuint16(&databuf, tsig.otherlen);

			isc_buffer_usedregion(&databuf, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

			/*
			 * Digest other data.
			 */
			if (tsig.otherlen > 0) {
				r.length = tsig.otherlen;
				r.base = tsig.other;
				ret = dst_context_adddata(ctx, &r);
				if (ret != ISC_R_SUCCESS)
					goto cleanup_context;
			}
		}

		ret = dst_key_sigsize(key->key, &sigsize);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;
		tsig.signature = (unsigned char *) isc_mem_get(mctx, sigsize);
		if (tsig.signature == NULL) {
			ret = ISC_R_NOMEMORY;
			goto cleanup_context;
		}

		isc_buffer_init(&sigbuf, tsig.signature, sigsize);
		ret = dst_context_sign(ctx, &sigbuf);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_signature;
		dst_context_destroy(&ctx);
		digestbits = dst_key_getbits(key->key);
		if (digestbits != 0) {
			unsigned int bytes = (digestbits + 1) / 8;
			if (response && bytes < querytsig.siglen)
				bytes = querytsig.siglen;
			if (bytes > isc_buffer_usedlength(&sigbuf))
				bytes = isc_buffer_usedlength(&sigbuf);
			tsig.siglen = bytes;
		} else
			tsig.siglen = isc_buffer_usedlength(&sigbuf);
	} else {
		tsig.siglen = 0;
		tsig.signature = NULL;
	}

	ret = dns_message_gettemprdata(msg, &rdata);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_signature;
	ret = isc_buffer_allocate(msg->mctx, &dynbuf, 512);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_rdata;
	ret = dns_rdata_fromstruct(rdata, dns_rdataclass_any,
				   dns_rdatatype_tsig, &tsig, dynbuf);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_dynbuf;

	dns_message_takebuffer(msg, &dynbuf);

	if (tsig.signature != NULL) {
		isc_mem_put(mctx, tsig.signature, sigsize);
		tsig.signature = NULL;
	}

	owner = NULL;
	ret = dns_message_gettempname(msg, &owner);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_rdata;
	dns_name_init(owner, NULL);
	ret = dns_name_dup(&key->name, msg->mctx, owner);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_owner;

	datalist = NULL;
	ret = dns_message_gettemprdatalist(msg, &datalist);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_owner;
	dataset = NULL;
	ret = dns_message_gettemprdataset(msg, &dataset);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_rdatalist;
	datalist->rdclass = dns_rdataclass_any;
	datalist->type = dns_rdatatype_tsig;
	datalist->covers = 0;
	datalist->ttl = 0;
	ISC_LIST_INIT(datalist->rdata);
	ISC_LIST_APPEND(datalist->rdata, rdata, link);
	RUNTIME_CHECK(dns_rdatalist_tordataset(datalist, dataset)
		      == ISC_R_SUCCESS);
	msg->tsig = dataset;
	msg->tsigname = owner;

	/* Windows does not like the tsig name being compressed. */
	msg->tsigname->attributes |= DNS_NAMEATTR_NOCOMPRESS;

	return (ISC_R_SUCCESS);

 cleanup_rdatalist:
	dns_message_puttemprdatalist(msg, &datalist);
 cleanup_owner:
	dns_message_puttempname(msg, &owner);
	goto cleanup_rdata;
 cleanup_dynbuf:
	isc_buffer_free(&dynbuf);
 cleanup_rdata:
	dns_message_puttemprdata(msg, &rdata);
 cleanup_signature:
	if (tsig.signature != NULL)
		isc_mem_put(mctx, tsig.signature, sigsize);
 cleanup_context:
	if (ctx != NULL)
		dst_context_destroy(&ctx);
	return (ret);
}
Example #3
0
static isc_result_t
tsig_verify_tcp(isc_buffer_t *source, dns_message_t *msg) {
	dns_rdata_any_tsig_t tsig, querytsig;
	isc_region_t r, source_r, header_r, sig_r;
	isc_buffer_t databuf;
	unsigned char data[32];
	dns_name_t *keyname;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	isc_stdtime_t now;
	isc_result_t ret;
	dns_tsigkey_t *tsigkey;
	dst_key_t *key = NULL;
	unsigned char header[DNS_MESSAGE_HEADERLEN];
	isc_uint16_t addcount, id;
	isc_boolean_t has_tsig = ISC_FALSE;
	isc_mem_t *mctx;

	REQUIRE(source != NULL);
	REQUIRE(msg != NULL);
	REQUIRE(dns_message_gettsigkey(msg) != NULL);
	REQUIRE(msg->tcp_continuation == 1);
	REQUIRE(msg->querytsig != NULL);

	if (!is_response(msg))
		return (DNS_R_EXPECTEDRESPONSE);

	mctx = msg->mctx;

	tsigkey = dns_message_gettsigkey(msg);

	/*
	 * Extract and parse the previous TSIG
	 */
	ret = dns_rdataset_first(msg->querytsig);
	if (ret != ISC_R_SUCCESS)
		return (ret);
	dns_rdataset_current(msg->querytsig, &rdata);
	ret = dns_rdata_tostruct(&rdata, &querytsig, NULL);
	if (ret != ISC_R_SUCCESS)
		return (ret);
	dns_rdata_reset(&rdata);

	/*
	 * If there is a TSIG in this message, do some checks.
	 */
	if (msg->tsig != NULL) {
		has_tsig = ISC_TRUE;

		keyname = msg->tsigname;
		ret = dns_rdataset_first(msg->tsig);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_querystruct;
		dns_rdataset_current(msg->tsig, &rdata);
		ret = dns_rdata_tostruct(&rdata, &tsig, NULL);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_querystruct;

		/*
		 * Do the key name and algorithm match that of the query?
		 */
		if (!dns_name_equal(keyname, &tsigkey->name) ||
		    !dns_name_equal(&tsig.algorithm, &querytsig.algorithm)) {
			msg->tsigstatus = dns_tsigerror_badkey;
			ret = DNS_R_TSIGVERIFYFAILURE;
			tsig_log(msg->tsigkey, 2,
				 "key name and algorithm do not match");
			goto cleanup_querystruct;
		}

		/*
		 * Is the time ok?
		 */
		isc_stdtime_get(&now);

		if (now + msg->timeadjust > tsig.timesigned + tsig.fudge) {
			msg->tsigstatus = dns_tsigerror_badtime;
			tsig_log(msg->tsigkey, 2, "signature has expired");
			ret = DNS_R_CLOCKSKEW;
			goto cleanup_querystruct;
		} else if (now + msg->timeadjust <
			   tsig.timesigned - tsig.fudge) {
			msg->tsigstatus = dns_tsigerror_badtime;
			tsig_log(msg->tsigkey, 2,
				 "signature is in the future");
			ret = DNS_R_CLOCKSKEW;
			goto cleanup_querystruct;
		}
	}

	key = tsigkey->key;

	if (msg->tsigctx == NULL) {
		ret = dst_context_create3(key, mctx,
					  DNS_LOGCATEGORY_DNSSEC,
					  ISC_FALSE, &msg->tsigctx);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_querystruct;

		/*
		 * Digest the length of the query signature
		 */
		isc_buffer_init(&databuf, data, sizeof(data));
		isc_buffer_putuint16(&databuf, querytsig.siglen);
		isc_buffer_usedregion(&databuf, &r);
		ret = dst_context_adddata(msg->tsigctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		/*
		 * Digest the data of the query signature
		 */
		if (querytsig.siglen > 0) {
			r.length = querytsig.siglen;
			r.base = querytsig.signature;
			ret = dst_context_adddata(msg->tsigctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
		}
	}

	/*
	 * Extract the header.
	 */
	isc_buffer_usedregion(source, &r);
	memmove(header, r.base, DNS_MESSAGE_HEADERLEN);
	isc_region_consume(&r, DNS_MESSAGE_HEADERLEN);

	/*
	 * Decrement the additional field counter if necessary.
	 */
	if (has_tsig) {
		memmove(&addcount, &header[DNS_MESSAGE_HEADERLEN - 2], 2);
		addcount = htons((isc_uint16_t)(ntohs(addcount) - 1));
		memmove(&header[DNS_MESSAGE_HEADERLEN - 2], &addcount, 2);
	}

	/*
	 * Put in the original id.
	 */
	/* XXX Can TCP transfers be forwarded?  How would that work? */
	if (has_tsig) {
		id = htons(tsig.originalid);
		memmove(&header[0], &id, 2);
	}

	/*
	 * Digest the modified header.
	 */
	header_r.base = (unsigned char *) header;
	header_r.length = DNS_MESSAGE_HEADERLEN;
	ret = dst_context_adddata(msg->tsigctx, &header_r);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_context;

	/*
	 * Digest all non-TSIG records.
	 */
	isc_buffer_usedregion(source, &source_r);
	r.base = source_r.base + DNS_MESSAGE_HEADERLEN;
	if (has_tsig)
		r.length = msg->sigstart - DNS_MESSAGE_HEADERLEN;
	else
		r.length = source_r.length - DNS_MESSAGE_HEADERLEN;
	ret = dst_context_adddata(msg->tsigctx, &r);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_context;

	/*
	 * Digest the time signed and fudge.
	 */
	if (has_tsig) {
		isc_buffer_init(&databuf, data, sizeof(data));
		isc_buffer_putuint48(&databuf, tsig.timesigned);
		isc_buffer_putuint16(&databuf, tsig.fudge);
		isc_buffer_usedregion(&databuf, &r);
		ret = dst_context_adddata(msg->tsigctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		sig_r.base = tsig.signature;
		sig_r.length = tsig.siglen;
		if (tsig.siglen == 0) {
			if (tsig.error != dns_rcode_noerror) {
				if (tsig.error == dns_tsigerror_badtime)
					ret = DNS_R_CLOCKSKEW;
				else
					ret = DNS_R_TSIGERRORSET;
			} else {
				tsig_log(msg->tsigkey, 2,
					 "signature is empty");
				ret = DNS_R_TSIGVERIFYFAILURE;
			}
			goto cleanup_context;
		}

		ret = dst_context_verify(msg->tsigctx, &sig_r);
		if (ret == DST_R_VERIFYFAILURE) {
			msg->tsigstatus = dns_tsigerror_badsig;
			tsig_log(msg->tsigkey, 2,
				 "signature failed to verify(2)");
			ret = DNS_R_TSIGVERIFYFAILURE;
			goto cleanup_context;
		}
		else if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		dst_context_destroy(&msg->tsigctx);
	}

	msg->tsigstatus = dns_rcode_noerror;
	return (ISC_R_SUCCESS);

 cleanup_context:
	dst_context_destroy(&msg->tsigctx);

 cleanup_querystruct:
	dns_rdata_freestruct(&querytsig);

	return (ret);

}
Example #4
0
isc_result_t
dns_tsig_verify(isc_buffer_t *source, dns_message_t *msg,
		dns_tsig_keyring_t *ring1, dns_tsig_keyring_t *ring2)
{
	dns_rdata_any_tsig_t tsig, querytsig;
	isc_region_t r, source_r, header_r, sig_r;
	isc_buffer_t databuf;
	unsigned char data[32];
	dns_name_t *keyname;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	isc_stdtime_t now;
	isc_result_t ret;
	dns_tsigkey_t *tsigkey;
	dst_key_t *key = NULL;
	unsigned char header[DNS_MESSAGE_HEADERLEN];
	dst_context_t *ctx = NULL;
	isc_mem_t *mctx;
	isc_uint16_t addcount, id;
	unsigned int siglen;
	unsigned int alg;
	isc_boolean_t response;

	REQUIRE(source != NULL);
	REQUIRE(DNS_MESSAGE_VALID(msg));
	tsigkey = dns_message_gettsigkey(msg);
	response = is_response(msg);

	REQUIRE(tsigkey == NULL || VALID_TSIG_KEY(tsigkey));

	msg->verify_attempted = 1;

	if (msg->tcp_continuation) {
		if (tsigkey == NULL || msg->querytsig == NULL)
			return (DNS_R_UNEXPECTEDTSIG);
		return (tsig_verify_tcp(source, msg));
	}

	/*
	 * There should be a TSIG record...
	 */
	if (msg->tsig == NULL)
		return (DNS_R_EXPECTEDTSIG);

	/*
	 * If this is a response and there's no key or query TSIG, there
	 * shouldn't be one on the response.
	 */
	if (response && (tsigkey == NULL || msg->querytsig == NULL))
		return (DNS_R_UNEXPECTEDTSIG);

	mctx = msg->mctx;

	/*
	 * If we're here, we know the message is well formed and contains a
	 * TSIG record.
	 */

	keyname = msg->tsigname;
	ret = dns_rdataset_first(msg->tsig);
	if (ret != ISC_R_SUCCESS)
		return (ret);
	dns_rdataset_current(msg->tsig, &rdata);
	ret = dns_rdata_tostruct(&rdata, &tsig, NULL);
	if (ret != ISC_R_SUCCESS)
		return (ret);
	dns_rdata_reset(&rdata);
	if (response) {
		ret = dns_rdataset_first(msg->querytsig);
		if (ret != ISC_R_SUCCESS)
			return (ret);
		dns_rdataset_current(msg->querytsig, &rdata);
		ret = dns_rdata_tostruct(&rdata, &querytsig, NULL);
		if (ret != ISC_R_SUCCESS)
			return (ret);
	}
#if defined(__clang__) && \
       ( __clang_major__ < 3 || \
	(__clang_major__ == 3 && __clang_minor__ < 2) || \
	(__clang_major__ == 4 && __clang_minor__ < 2))
	/* false positive: http://llvm.org/bugs/show_bug.cgi?id=14461 */
		else memset(&querytsig, 0, sizeof(querytsig));
#endif

	/*
	 * Do the key name and algorithm match that of the query?
	 */
	if (response &&
	    (!dns_name_equal(keyname, &tsigkey->name) ||
	     !dns_name_equal(&tsig.algorithm, &querytsig.algorithm))) {
		msg->tsigstatus = dns_tsigerror_badkey;
		tsig_log(msg->tsigkey, 2,
			 "key name and algorithm do not match");
		return (DNS_R_TSIGVERIFYFAILURE);
	}

	/*
	 * Get the current time.
	 */
	isc_stdtime_get(&now);

	/*
	 * Find dns_tsigkey_t based on keyname.
	 */
	if (tsigkey == NULL) {
		ret = ISC_R_NOTFOUND;
		if (ring1 != NULL)
			ret = dns_tsigkey_find(&tsigkey, keyname,
					       &tsig.algorithm, ring1);
		if (ret == ISC_R_NOTFOUND && ring2 != NULL)
			ret = dns_tsigkey_find(&tsigkey, keyname,
					       &tsig.algorithm, ring2);
		if (ret != ISC_R_SUCCESS) {
			msg->tsigstatus = dns_tsigerror_badkey;
			ret = dns_tsigkey_create(keyname, &tsig.algorithm,
						 NULL, 0, ISC_FALSE, NULL,
						 now, now,
						 mctx, NULL, &msg->tsigkey);
			if (ret != ISC_R_SUCCESS)
				return (ret);
			tsig_log(msg->tsigkey, 2, "unknown key");
			return (DNS_R_TSIGVERIFYFAILURE);
		}
		msg->tsigkey = tsigkey;
	}

	key = tsigkey->key;

	/*
	 * Is the time ok?
	 */
	if (now + msg->timeadjust > tsig.timesigned + tsig.fudge) {
		msg->tsigstatus = dns_tsigerror_badtime;
		tsig_log(msg->tsigkey, 2, "signature has expired");
		return (DNS_R_CLOCKSKEW);
	} else if (now + msg->timeadjust < tsig.timesigned - tsig.fudge) {
		msg->tsigstatus = dns_tsigerror_badtime;
		tsig_log(msg->tsigkey, 2, "signature is in the future");
		return (DNS_R_CLOCKSKEW);
	}

	/*
	 * Check digest length.
	 */
	alg = dst_key_alg(key);
	ret = dst_key_sigsize(key, &siglen);
	if (ret != ISC_R_SUCCESS)
		return (ret);
	if (alg == DST_ALG_HMACMD5 || alg == DST_ALG_HMACSHA1 ||
	    alg == DST_ALG_HMACSHA224 || alg == DST_ALG_HMACSHA256 ||
	    alg == DST_ALG_HMACSHA384 || alg == DST_ALG_HMACSHA512) {
		isc_uint16_t digestbits = dst_key_getbits(key);
		if (tsig.siglen > siglen) {
			tsig_log(msg->tsigkey, 2, "signature length too big");
			return (DNS_R_FORMERR);
		}
		if (tsig.siglen > 0 &&
		    (tsig.siglen < 10 || tsig.siglen < ((siglen + 1) / 2))) {
			tsig_log(msg->tsigkey, 2,
				 "signature length below minimum");
			return (DNS_R_FORMERR);
		}
		if (tsig.siglen > 0 && digestbits != 0 &&
		    tsig.siglen < ((digestbits + 1) / 8)) {
			msg->tsigstatus = dns_tsigerror_badtrunc;
			tsig_log(msg->tsigkey, 2,
				 "truncated signature length too small");
			return (DNS_R_TSIGVERIFYFAILURE);
		}
		if (tsig.siglen > 0 && digestbits == 0 &&
		    tsig.siglen < siglen) {
			msg->tsigstatus = dns_tsigerror_badtrunc;
			tsig_log(msg->tsigkey, 2, "signature length too small");
			return (DNS_R_TSIGVERIFYFAILURE);
		}
	}

	if (tsig.siglen > 0) {
		sig_r.base = tsig.signature;
		sig_r.length = tsig.siglen;

		ret = dst_context_create3(key, mctx,
					  DNS_LOGCATEGORY_DNSSEC,
					  ISC_FALSE, &ctx);
		if (ret != ISC_R_SUCCESS)
			return (ret);

		if (response) {
			isc_buffer_init(&databuf, data, sizeof(data));
			isc_buffer_putuint16(&databuf, querytsig.siglen);
			isc_buffer_usedregion(&databuf, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
			if (querytsig.siglen > 0) {
				r.length = querytsig.siglen;
				r.base = querytsig.signature;
				ret = dst_context_adddata(ctx, &r);
				if (ret != ISC_R_SUCCESS)
					goto cleanup_context;
			}
		}

		/*
		 * Extract the header.
		 */
		isc_buffer_usedregion(source, &r);
		memmove(header, r.base, DNS_MESSAGE_HEADERLEN);
		isc_region_consume(&r, DNS_MESSAGE_HEADERLEN);

		/*
		 * Decrement the additional field counter.
		 */
		memmove(&addcount, &header[DNS_MESSAGE_HEADERLEN - 2], 2);
		addcount = htons((isc_uint16_t)(ntohs(addcount) - 1));
		memmove(&header[DNS_MESSAGE_HEADERLEN - 2], &addcount, 2);

		/*
		 * Put in the original id.
		 */
		id = htons(tsig.originalid);
		memmove(&header[0], &id, 2);

		/*
		 * Digest the modified header.
		 */
		header_r.base = (unsigned char *) header;
		header_r.length = DNS_MESSAGE_HEADERLEN;
		ret = dst_context_adddata(ctx, &header_r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		/*
		 * Digest all non-TSIG records.
		 */
		isc_buffer_usedregion(source, &source_r);
		r.base = source_r.base + DNS_MESSAGE_HEADERLEN;
		r.length = msg->sigstart - DNS_MESSAGE_HEADERLEN;
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		/*
		 * Digest the key name.
		 */
		dns_name_toregion(&tsigkey->name, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		isc_buffer_init(&databuf, data, sizeof(data));
		isc_buffer_putuint16(&databuf, tsig.common.rdclass);
		isc_buffer_putuint32(&databuf, msg->tsig->ttl);
		isc_buffer_usedregion(&databuf, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		/*
		 * Digest the key algorithm.
		 */
		dns_name_toregion(tsigkey->algorithm, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		isc_buffer_clear(&databuf);
		isc_buffer_putuint48(&databuf, tsig.timesigned);
		isc_buffer_putuint16(&databuf, tsig.fudge);
		isc_buffer_putuint16(&databuf, tsig.error);
		isc_buffer_putuint16(&databuf, tsig.otherlen);
		isc_buffer_usedregion(&databuf, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		if (tsig.otherlen > 0) {
			r.base = tsig.other;
			r.length = tsig.otherlen;
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
		}

		ret = dst_context_verify(ctx, &sig_r);
		if (ret == DST_R_VERIFYFAILURE) {
			msg->tsigstatus = dns_tsigerror_badsig;
			ret = DNS_R_TSIGVERIFYFAILURE;
			tsig_log(msg->tsigkey, 2,
				 "signature failed to verify(1)");
			goto cleanup_context;
		} else if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		dst_context_destroy(&ctx);
	} else if (tsig.error != dns_tsigerror_badsig &&
		   tsig.error != dns_tsigerror_badkey) {
		msg->tsigstatus = dns_tsigerror_badsig;
		tsig_log(msg->tsigkey, 2, "signature was empty");
		return (DNS_R_TSIGVERIFYFAILURE);
	}

	msg->tsigstatus = dns_rcode_noerror;

	if (tsig.error != dns_rcode_noerror) {
		if (tsig.error == dns_tsigerror_badtime)
			return (DNS_R_CLOCKSKEW);
		else
			return (DNS_R_TSIGERRORSET);
	}

	msg->verified_sig = 1;

	return (ISC_R_SUCCESS);

cleanup_context:
	if (ctx != NULL)
		dst_context_destroy(&ctx);

	return (ret);
}
Example #5
0
isc_result_t
dns_tsig_sign(dns_message_t *msg) {
	dns_tsigkey_t *key;
	dns_rdata_any_tsig_t tsig, querytsig;
	unsigned char data[128];
	isc_buffer_t databuf, sigbuf;
	isc_buffer_t *dynbuf;
	dns_name_t *owner;
	dns_rdata_t *rdata;
	dns_rdatalist_t *datalist;
	dns_rdataset_t *dataset;
	isc_region_t r;
	isc_stdtime_t now;
	isc_mem_t *mctx;
	dst_context_t *ctx = NULL;
	isc_result_t ret;
	unsigned char badtimedata[BADTIMELEN];
	unsigned int sigsize = 0;

	REQUIRE(msg != NULL);
	REQUIRE(VALID_TSIG_KEY(dns_message_gettsigkey(msg)));

	/*
	 * If this is a response, there should be a query tsig.
	 */
	if (is_response(msg) && msg->querytsig == NULL)
		return (DNS_R_EXPECTEDTSIG);

	dynbuf = NULL;

	mctx = msg->mctx;
	key = dns_message_gettsigkey(msg);

	tsig.mctx = mctx;
	tsig.common.rdclass = dns_rdataclass_any;
	tsig.common.rdtype = dns_rdatatype_tsig;
	ISC_LINK_INIT(&tsig.common, link);
	dns_name_init(&tsig.algorithm, NULL);
	dns_name_clone(key->algorithm, &tsig.algorithm);

	isc_stdtime_get(&now);
	tsig.timesigned = now + msg->timeadjust;
	tsig.fudge = DNS_TSIG_FUDGE;

	tsig.originalid = msg->id;

	isc_buffer_init(&databuf, data, sizeof(data));

	if (is_response(msg))
		tsig.error = msg->querytsigstatus;
	else
		tsig.error = dns_rcode_noerror;

	if (tsig.error != dns_tsigerror_badtime) {
		tsig.otherlen = 0;
		tsig.other = NULL;
	} else {
		isc_buffer_t otherbuf;

		tsig.otherlen = BADTIMELEN;
		tsig.other = badtimedata;
		isc_buffer_init(&otherbuf, tsig.other, tsig.otherlen);
		buffer_putuint48(&otherbuf, tsig.timesigned);
	}

	if (key->key != NULL && tsig.error != dns_tsigerror_badsig) {
		unsigned char header[DNS_MESSAGE_HEADERLEN];
		isc_buffer_t headerbuf;

		ret = dst_context_create(key->key, mctx, &ctx);
		if (ret != ISC_R_SUCCESS)
			return (ret);

		/*
		 * If this is a response, digest the query signature.
		 */
		if (is_response(msg)) {
			dns_rdata_t querytsigrdata = DNS_RDATA_INIT;

			ret = dns_rdataset_first(msg->querytsig);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
			dns_rdataset_current(msg->querytsig, &querytsigrdata);
			ret = dns_rdata_tostruct(&querytsigrdata, &querytsig,
						 NULL);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
			isc_buffer_putuint16(&databuf, querytsig.siglen);
			if (isc_buffer_availablelength(&databuf) <
			    querytsig.siglen)
			{
				ret = ISC_R_NOSPACE;
				goto cleanup_context;
			}
			isc_buffer_putmem(&databuf, querytsig.signature,
					  querytsig.siglen);
			isc_buffer_usedregion(&databuf, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;
		}

		/*
		 * Digest the header.
		 */
		isc_buffer_init(&headerbuf, header, sizeof(header));
		dns_message_renderheader(msg, &headerbuf);
		isc_buffer_usedregion(&headerbuf, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		/*
		 * Digest the remainder of the message.
		 */
		isc_buffer_usedregion(msg->buffer, &r);
		isc_region_consume(&r, DNS_MESSAGE_HEADERLEN);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		if (msg->tcp_continuation == 0) {
			/*
			 * Digest the name, class, ttl, alg.
			 */
			dns_name_toregion(&key->name, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

			isc_buffer_clear(&databuf);
			isc_buffer_putuint16(&databuf, dns_rdataclass_any);
			isc_buffer_putuint32(&databuf, 0); /* ttl */
			isc_buffer_usedregion(&databuf, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

			dns_name_toregion(&tsig.algorithm, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

		}
		/* Digest the timesigned and fudge */
		isc_buffer_clear(&databuf);
		if (tsig.error == dns_tsigerror_badtime)
			tsig.timesigned = querytsig.timesigned;
		buffer_putuint48(&databuf, tsig.timesigned);
		isc_buffer_putuint16(&databuf, tsig.fudge);
		isc_buffer_usedregion(&databuf, &r);
		ret = dst_context_adddata(ctx, &r);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;

		if (msg->tcp_continuation == 0) {
			/*
			 * Digest the error and other data length.
			 */
			isc_buffer_clear(&databuf);
			isc_buffer_putuint16(&databuf, tsig.error);
			isc_buffer_putuint16(&databuf, tsig.otherlen);

			isc_buffer_usedregion(&databuf, &r);
			ret = dst_context_adddata(ctx, &r);
			if (ret != ISC_R_SUCCESS)
				goto cleanup_context;

			/*
			 * Digest the error and other data.
			 */
			if (tsig.otherlen > 0) {
				r.length = tsig.otherlen;
				r.base = tsig.other;
				ret = dst_context_adddata(ctx, &r);
				if (ret != ISC_R_SUCCESS)
					goto cleanup_context;
			}
		}

		ret = dst_key_sigsize(key->key, &sigsize);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_context;
		tsig.signature = (unsigned char *) isc_mem_get(mctx, sigsize);
		if (tsig.signature == NULL) {
			ret = ISC_R_NOMEMORY;
			goto cleanup_context;
		}

		isc_buffer_init(&sigbuf, tsig.signature, sigsize);
		ret = dst_context_sign(ctx, &sigbuf);
		if (ret != ISC_R_SUCCESS)
			goto cleanup_signature;
		dst_context_destroy(&ctx);
		tsig.siglen = isc_buffer_usedlength(&sigbuf);
	} else {
		tsig.siglen = 0;
		tsig.signature = NULL;
	}

	rdata = NULL;
	ret = dns_message_gettemprdata(msg, &rdata);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_signature;
	ret = isc_buffer_allocate(msg->mctx, &dynbuf, 512);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_signature;
	ret = dns_rdata_fromstruct(rdata, dns_rdataclass_any,
				   dns_rdatatype_tsig, &tsig, dynbuf);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_dynbuf;

	dns_message_takebuffer(msg, &dynbuf);

	if (tsig.signature != NULL) {
		isc_mem_put(mctx, tsig.signature, sigsize);
		tsig.signature = NULL;
	}

	owner = NULL;
	ret = dns_message_gettempname(msg, &owner);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_dynbuf;
	dns_name_init(owner, NULL);
	ret = dns_name_dup(&key->name, msg->mctx, owner);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_owner;

	datalist = NULL;
	ret = dns_message_gettemprdatalist(msg, &datalist);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_owner;
	datalist->rdclass = dns_rdataclass_any;
	datalist->type = dns_rdatatype_tsig;
	datalist->covers = 0;
	datalist->ttl = 0;
	ISC_LIST_INIT(datalist->rdata);
	ISC_LIST_APPEND(datalist->rdata, rdata, link);
	dataset = NULL;
	ret = dns_message_gettemprdataset(msg, &dataset);
	if (ret != ISC_R_SUCCESS)
		goto cleanup_owner;
	dns_rdataset_init(dataset);
	RUNTIME_CHECK(dns_rdatalist_tordataset(datalist, dataset)
		      == ISC_R_SUCCESS);
	msg->tsig = dataset;
	msg->tsigname = owner;

	return (ISC_R_SUCCESS);

cleanup_owner:
	if (owner != NULL)
		dns_message_puttempname(msg, &owner);
cleanup_dynbuf:
	if (dynbuf != NULL)
		isc_buffer_free(&dynbuf);
cleanup_signature:
	if (tsig.signature != NULL)
		isc_mem_put(mctx, tsig.signature, sigsize);
cleanup_context:
	if (ctx != NULL)
		dst_context_destroy(&ctx);
	return (ret);
}
Example #6
0
void
ns_notify_start(ns_client_t *client) {
	dns_message_t *request = client->message;
	isc_result_t result;
	dns_name_t *zonename;
	dns_rdataset_t *zone_rdataset;
	dns_zone_t *zone = NULL;
	char namebuf[DNS_NAME_FORMATSIZE];
	char tsigbuf[DNS_NAME_FORMATSIZE + sizeof(": TSIG ''")];
	dns_tsigkey_t *tsigkey;

	/*
	 * Interpret the question section.
	 */
	result = dns_message_firstname(request, DNS_SECTION_QUESTION);
	if (result != ISC_R_SUCCESS) {
		notify_log(client, ISC_LOG_NOTICE,
			   "notify question section empty");
		goto formerr;
	}

	/*
	 * The question section must contain exactly one question.
	 */
	zonename = NULL;
	dns_message_currentname(request, DNS_SECTION_QUESTION, &zonename);
	zone_rdataset = ISC_LIST_HEAD(zonename->list);
	if (ISC_LIST_NEXT(zone_rdataset, link) != NULL) {
		notify_log(client, ISC_LOG_NOTICE,
			   "notify question section contains multiple RRs");
		goto formerr;
	}

	/* The zone section must have exactly one name. */
	result = dns_message_nextname(request, DNS_SECTION_ZONE);
	if (result != ISC_R_NOMORE) {
		notify_log(client, ISC_LOG_NOTICE,
			   "notify question section contains multiple RRs");
		goto formerr;
	}

	/* The one rdataset must be an SOA. */
	if (zone_rdataset->type != dns_rdatatype_soa) {
		notify_log(client, ISC_LOG_NOTICE,
			   "notify question section contains no SOA");
		goto formerr;
	}

	tsigkey = dns_message_gettsigkey(request);
	if (tsigkey != NULL) {
		dns_name_format(&tsigkey->name, namebuf, sizeof(namebuf));

		if (tsigkey->generated) {
			char cnamebuf[DNS_NAME_FORMATSIZE];
			dns_name_format(tsigkey->creator, cnamebuf,
					sizeof(cnamebuf));
			snprintf(tsigbuf, sizeof(tsigbuf), ": TSIG '%s' (%s)",
				 namebuf, cnamebuf);
		} else {
			snprintf(tsigbuf, sizeof(tsigbuf), ": TSIG '%s'",
				 namebuf);
		}
	} else
		tsigbuf[0] = '\0';
	dns_name_format(zonename, namebuf, sizeof(namebuf));
	result = dns_zt_find(client->view->zonetable, zonename, 0, NULL,
			     &zone);
	if (result != ISC_R_SUCCESS)
		goto notauth;

	switch (dns_zone_gettype(zone)) {
	case dns_zone_master:
	case dns_zone_slave:
	case dns_zone_stub:	/* Allow dialup passive to work. */
		notify_log(client, ISC_LOG_INFO,
			   "received notify for zone '%s'%s", namebuf, tsigbuf);
		respond(client, dns_zone_notifyreceive(zone,
			ns_client_getsockaddr(client), request));
		break;
	default:
		goto notauth;
	}
	dns_zone_detach(&zone);
	return;

 notauth:
	notify_log(client, ISC_LOG_NOTICE,
		   "received notify for zone '%s'%s: not authoritative",
		   namebuf, tsigbuf);
	result = DNS_R_NOTAUTH;
	goto failure;

 formerr:
	result = DNS_R_FORMERR;

 failure:
	if (zone != NULL)
		dns_zone_detach(&zone);
	respond(client, result);
}