adden new isakmpd

1 files changed, 293 insertions, 0 deletions

diff --git a/keyexchange/isakmpd-20041012/dnssec.c b/keyexchange/isakmpd-20041012/dnssec.c
new file mode 100644
index 0000000..b7ee75f
--- /dev/null
+++ b/keyexchange/isakmpd-20041012/dnssec.c
@@ -0,0 +1,293 @@
+/* $OpenBSD: dnssec.c,v 1.20 2004/06/14 09:55:41 ho Exp $	 */
+
+/*
+ * Copyright (c) 2001 Håkan Olsson.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+
+#include <openssl/rsa.h>
+
+#ifdef LWRES
+#include <lwres/netdb.h>
+#include <dns/keyvalues.h>
+#else
+#include <netdb.h>
+#endif
+
+#include "sysdep.h"
+
+#include "dnssec.h"
+#include "exchange.h"
+#include "ipsec_num.h"
+#include "libcrypto.h"
+#include "log.h"
+#include "message.h"
+#include "transport.h"
+#include "util.h"
+
+#ifndef DNS_UFQDN_SEPARATOR
+#define DNS_UFQDN_SEPARATOR "._ipsec."
+#endif
+
+/* adapted from <dns/rdatastruct.h> / RFC 2535  */
+struct dns_rdata_key {
+	u_int16_t       flags;
+	u_int8_t        protocol;
+	u_int8_t        algorithm;
+	u_int16_t       datalen;
+	unsigned char  *data;
+};
+
+void *
+dns_get_key(int type, struct message *msg, int *keylen)
+{
+	struct exchange *exchange = msg->exchange;
+	struct rrsetinfo *rr;
+	struct dns_rdata_key key_rr;
+	char            name[MAXHOSTNAMELEN];
+	in_addr_t       ip4;
+	u_int8_t        algorithm, *id, *umark;
+	size_t          id_len;
+	int             ret, i;
+
+	switch (type) {
+	case IKE_AUTH_RSA_SIG:
+		algorithm = DNS_KEYALG_RSA;
+		break;
+
+	case IKE_AUTH_RSA_ENC:
+	case IKE_AUTH_RSA_ENC_REV:
+		/* XXX Not yet. */
+		/* algorithm = DNS_KEYALG_RSA; */
+		return 0;
+
+	case IKE_AUTH_DSS:
+		/* XXX Not yet. */
+		/* algorithm = DNS_KEYALG_DSS; */
+		return 0;
+
+	case IKE_AUTH_PRE_SHARED:
+	default:
+		return 0;
+	}
+
+	id = exchange->initiator ? exchange->id_r : exchange->id_i;
+	id_len = exchange->initiator ? exchange->id_r_len : exchange->id_i_len;
+	memset(name, 0, sizeof name);
+
+	if (!id || id_len == 0) {
+		log_print("dns_get_key: ID is missing");
+		return 0;
+	}
+	/* Exchanges (and SAs) don't carry the ID in ISAKMP form */
+	id -= ISAKMP_GEN_SZ;
+	id_len += ISAKMP_GEN_SZ - ISAKMP_ID_DATA_OFF;
+
+	switch (GET_ISAKMP_ID_TYPE(id)) {
+	case IPSEC_ID_IPV4_ADDR:
+		/* We want to lookup a KEY RR in the reverse zone.  */
+		if (id_len < sizeof ip4)
+			return 0;
+		memcpy(&ip4, id + ISAKMP_ID_DATA_OFF, sizeof ip4);
+		snprintf(name, sizeof name, "%d.%d.%d.%d.in-addr.arpa.", ip4
+		    >> 24, (ip4 >> 16) & 0xFF, (ip4 >> 8) & 0xFF, ip4 & 0xFF);
+		break;
+
+	case IPSEC_ID_IPV6_ADDR:
+		/* XXX Not yet. */
+		return 0;
+		break;
+
+	case IPSEC_ID_FQDN:
+		if ((id_len + 1) >= sizeof name)
+			return 0;
+		/* ID is not NULL-terminated. Add trailing dot and NULL.  */
+		memcpy(name, id + ISAKMP_ID_DATA_OFF, id_len);
+		*(name + id_len) = '.';
+		*(name + id_len + 1) = '\0';
+		break;
+
+	case IPSEC_ID_USER_FQDN:
+		/*
+		 * Some special handling here. We want to convert the ID
+		 * 'user@host.domain' string into 'user._ipsec.host.domain.'.
+	         */
+		if ((id_len + sizeof(DNS_UFQDN_SEPARATOR)) >= sizeof name)
+			return 0;
+		/* Look for the '@' separator.  */
+		for (umark = id + ISAKMP_ID_DATA_OFF; (umark - id) < id_len;
+		    umark++)
+			if (*umark == '@')
+				break;
+		if (*umark != '@') {
+			LOG_DBG((LOG_MISC, 50, "dns_get_key: bad UFQDN ID"));
+			return 0;
+		}
+		*umark++ = '\0';
+		/* id is now terminated. 'umark', however, is not.  */
+		snprintf(name, sizeof name, "%s%s", id + ISAKMP_ID_DATA_OFF,
+		    DNS_UFQDN_SEPARATOR);
+		memcpy(name + strlen(name), umark, id_len - strlen(id) - 1);
+		*(name + id_len + sizeof(DNS_UFQDN_SEPARATOR) - 2) = '.';
+		*(name + id_len + sizeof(DNS_UFQDN_SEPARATOR) - 1) = '\0';
+		break;
+
+	default:
+		return 0;
+	}
+
+	LOG_DBG((LOG_MISC, 50, "dns_get_key: trying KEY RR for %s", name));
+	ret = getrrsetbyname(name, C_IN, T_KEY, 0, &rr);
+
+	if (ret) {
+		LOG_DBG((LOG_MISC, 30, "dns_get_key: no DNS responses "
+		    "(error %d)", ret));
+		return 0;
+	}
+	LOG_DBG((LOG_MISC, 80,
+	    "dns_get_key: rrset class %d type %d ttl %d nrdatas %d nrsigs %d",
+	    rr->rri_rdclass, rr->rri_rdtype, rr->rri_ttl, rr->rri_nrdatas,
+	    rr->rri_nsigs));
+
+	/* We don't accept unvalidated data. */
+	if (!(rr->rri_flags & RRSET_VALIDATED)) {
+		LOG_DBG((LOG_MISC, 10, "dns_get_key: "
+		    "got unvalidated response"));
+		freerrset(rr);
+		return 0;
+	}
+	/* Sanity. */
+	if (rr->rri_nrdatas == 0 || rr->rri_rdtype != T_KEY) {
+		LOG_DBG((LOG_MISC, 30, "dns_get_key: no KEY RRs received"));
+		freerrset(rr);
+		return 0;
+	}
+	memset(&key_rr, 0, sizeof key_rr);
+
+	/*
+	 * Find a key with the wanted algorithm, if any.
+	 * XXX If there are several keys present, we currently only find the
+	 * first.
+         */
+	for (i = 0; i < rr->rri_nrdatas && key_rr.datalen == 0; i++) {
+		key_rr.flags = ntohs((u_int16_t) * rr->rri_rdatas[i].rdi_data);
+		key_rr.protocol = *(rr->rri_rdatas[i].rdi_data + 2);
+		key_rr.algorithm = *(rr->rri_rdatas[i].rdi_data + 3);
+
+		if (key_rr.protocol != DNS_KEYPROTO_IPSEC) {
+			LOG_DBG((LOG_MISC, 50, "dns_get_key: ignored "
+			    "non-IPsec key"));
+			continue;
+		}
+		if (key_rr.algorithm != algorithm) {
+			LOG_DBG((LOG_MISC, 50, "dns_get_key: ignored "
+			    "key with other alg"));
+			continue;
+		}
+		key_rr.datalen = rr->rri_rdatas[i].rdi_length - 4;
+		if (key_rr.datalen <= 0) {
+			LOG_DBG((LOG_MISC, 50, "dns_get_key: "
+			    "ignored bad key"));
+			key_rr.datalen = 0;
+			continue;
+		}
+		/* This key seems to fit our requirements... */
+		key_rr.data = (char *)malloc(key_rr.datalen);
+		if (!key_rr.data) {
+			log_error("dns_get_key: malloc (%d) failed",
+			    key_rr.datalen);
+			freerrset(rr);
+			return 0;
+		}
+		memcpy(key_rr.data, rr->rri_rdatas[i].rdi_data + 4,
+		    key_rr.datalen);
+		*keylen = key_rr.datalen;
+	}
+
+	freerrset(rr);
+
+	if (key_rr.datalen)
+		return key_rr.data;
+	return 0;
+}
+
+int
+dns_RSA_dns_to_x509(u_int8_t *key, int keylen, RSA **rsa_key)
+{
+	RSA	*rsa;
+	int	 key_offset;
+	u_int8_t e_len;
+
+	if (!key || keylen <= 0) {
+		log_print("dns_RSA_dns_to_x509: invalid public key");
+		return -1;
+	}
+	rsa = RSA_new();
+	if (rsa == NULL) {
+		log_error("dns_RSA_dns_to_x509: "
+		    "failed to allocate new RSA struct");
+		return -1;
+	}
+	e_len = *key;
+	key_offset = 1;
+
+	if (e_len == 0) {
+		if (keylen < 3) {
+			log_print("dns_RSA_dns_to_x509: invalid public key");
+			RSA_free(rsa);
+			return -1;
+		}
+		e_len = *(key + key_offset++) << 8;
+		e_len += *(key + key_offset++);
+	}
+	if (e_len > (keylen - key_offset)) {
+		log_print("dns_RSA_dns_to_x509: invalid public key");
+		RSA_free(rsa);
+		return -1;
+	}
+	rsa->e = BN_bin2bn(key + key_offset, e_len, NULL);
+	key_offset += e_len;
+
+	/* XXX if (keylen <= key_offset) -> "invalid public key" ? */
+
+	rsa->n = BN_bin2bn(key + key_offset, keylen - key_offset, NULL);
+
+	*rsa_key = rsa;
+
+	LOG_DBG((LOG_MISC, 30, "dns_RSA_dns_to_x509: got %d bits RSA key",
+	    BN_num_bits(rsa->n)));
+	return 0;
+}
+
+#if notyet
+int
+dns_RSA_x509_to_dns(RSA *rsa_key, u_int8_t *key, int *keylen)
+{
+	return 0;
+}
+#endif