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|
/* $OpenBSD: isakmp_cfg.c,v 1.7 2001/10/26 12:03:07 ho Exp $ */
/*
* Copyright (c) 2001 Niklas Hallqvist. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Ericsson Radio Systems.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
/*
* This code was written under funding by Gatespace
* (http://www.gatespace.com/).
*/
#include <sys/types.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include "sysdep.h"
#include "attribute.h"
#include "conf.h"
#include "exchange.h"
#include "hash.h"
#include "ipsec.h"
#include "isakmp_fld.h"
#include "isakmp_num.h"
#include "log.h"
#include "message.h"
#include "prf.h"
#include "sa.h"
#include "util.h"
/*
* Validation script used to test messages for correct content of
* payloads depending on the exchange type.
*/
int16_t script_transaction[] = {
ISAKMP_PAYLOAD_ATTRIBUTE, /* Initiator -> responder. */
EXCHANGE_SCRIPT_SWITCH,
ISAKMP_PAYLOAD_ATTRIBUTE, /* Responder -> initiator. */
EXCHANGE_SCRIPT_END
};
static int decode_attribute (u_int16_t, u_int8_t *, u_int16_t, void *);
static int initiator_send_ATTR (struct message *);
static int initiator_recv_ATTR (struct message *);
static int responder_recv_ATTR (struct message *);
static int responder_send_ATTR (struct message *);
int (*isakmp_cfg_initiator[]) (struct message *) = {
initiator_send_ATTR,
initiator_recv_ATTR
};
int (*isakmp_cfg_responder[]) (struct message *) = {
responder_recv_ATTR,
responder_send_ATTR
};
/* XXX A lot can be shared with responder_send_ATTR. */
static int
initiator_send_ATTR (struct message *msg)
{
struct exchange *exchange = msg->exchange;
struct sa *isakmp_sa = msg->isakmp_sa;
struct ipsec_sa *isa = isakmp_sa->data;
struct hash *hash = hash_get (isa->hash);
struct prf *prf;
size_t hashsize = hash->hashsize;
u_int8_t *hashp = 0, *attrp;
size_t attrlen;
if (exchange->phase == 2)
{
/* We want a HASH payload to start with. XXX Share with others? */
hashp = malloc (ISAKMP_HASH_SZ + hashsize);
if (!hashp)
{
log_error ("responder_send_ATTR: malloc (%d) failed",
ISAKMP_HASH_SZ + hashsize);
return -1;
}
if (message_add_payload (msg, ISAKMP_PAYLOAD_HASH, hashp,
ISAKMP_HASH_SZ + hashsize, 1))
{
free (hashp);
return -1;
}
}
#ifndef to_be_removed
attrp = 0;
attrlen = 0;
#endif
if (exchange->phase == 2)
{
prf = prf_alloc (isa->prf_type, isa->hash, isa->skeyid_a,
isa->skeyid_len);
if (!prf)
return -1;
prf->Init (prf->prfctx);
prf->Update (prf->prfctx, exchange->message_id,
ISAKMP_HDR_MESSAGE_ID_LEN);
prf->Update (prf->prfctx, attrp, attrlen);
prf->Final (hashp + ISAKMP_GEN_SZ, prf->prfctx);
prf_free (prf);
}
return 0;
}
static int
initiator_recv_ATTR (struct message *msg)
{
struct exchange *exchange = msg->exchange;
#if 0
struct payload *p = TAILQ_FIRST (&msg->payload[ISAKMP_PAYLOAD_ATTRIBUTE]);
#endif
struct payload *hashp = TAILQ_FIRST (&msg->payload[ISAKMP_PAYLOAD_HASH]);
if (exchange->phase == 2)
{
if (!hashp)
{
/* XXX Should another NOTIFY type be used? */
message_drop (msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 0);
log_print ("initiator_recv_ATTR: phase 2 message missing HASH");
return -1;
}
/* XXX Verify hash! */
/* Mark the HASH as handled. */
hashp->flags |= PL_MARK;
}
return 0;
}
static int
responder_recv_ATTR (struct message *msg)
{
struct exchange *exchange = msg->exchange;
struct payload *attrp
= TAILQ_FIRST (&msg->payload[ISAKMP_PAYLOAD_ATTRIBUTE]);
struct payload *hashp = TAILQ_FIRST (&msg->payload[ISAKMP_PAYLOAD_HASH]);
struct ipsec_exch *ie = exchange->data;
struct sa *isakmp_sa = msg->isakmp_sa;
struct ipsec_sa *isa = isakmp_sa->data;
struct prf *prf;
u_int8_t *hash, *comp_hash;
size_t hash_len;
if (exchange->phase == 2)
{
if (!hashp)
{
/* XXX Should another NOTIFY type be used? */
message_drop (msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 0);
log_print ("responder_recv_ATTR: phase 2 message missing HASH");
return -1;
}
hash = hashp->p;
hash_len = GET_ISAKMP_GEN_LENGTH (hash);
comp_hash = malloc (hash_len - ISAKMP_GEN_SZ);
if (!comp_hash)
{
log_error ("responder_recv_ATTR: malloc (%d) failed",
hash_len - ISAKMP_GEN_SZ);
return -1;
}
/* Verify hash! */
prf = prf_alloc (isa->prf_type, isa->hash, isa->skeyid_a,
isa->skeyid_len);
if (!prf)
{
free (comp_hash);
return -1;
}
prf->Init (prf->prfctx);
prf->Update (prf->prfctx, exchange->message_id,
ISAKMP_HDR_MESSAGE_ID_LEN);
prf->Update (prf->prfctx, hash + hash_len,
msg->iov[0].iov_len - ISAKMP_HDR_SZ - hash_len);
prf->Final (comp_hash, prf->prfctx);
prf_free (prf);
if (memcmp (hash + ISAKMP_GEN_SZ, comp_hash, hash_len - ISAKMP_GEN_SZ)
!= 0)
{
message_drop (msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 0);
free (comp_hash);
return -1;
}
free (comp_hash);
/* Mark the HASH as handled. */
hashp->flags |= PL_MARK;
}
ie->cfg_id = GET_ISAKMP_ATTRIBUTE_ID (attrp->p);
switch (attrp->p[ISAKMP_ATTRIBUTE_TYPE_OFF])
{
case ISAKMP_CFG_REQUEST:
attribute_map (attrp->p + ISAKMP_ATTRIBUTE_ATTRS_OFF,
GET_ISAKMP_GEN_LENGTH (attrp->p)
- ISAKMP_TRANSFORM_SA_ATTRS_OFF, decode_attribute, ie);
break;
#ifdef notyet
case ISAKMP_CFG_SET:
break;
#endif
default:
message_drop (msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1, 0);
log_print ("responder_recv_ATTR: "
"unexpected configuration message type %d",
attrp->p[ISAKMP_ATTRIBUTE_TYPE_OFF]);
return -1;
}
return 0;
}
/* XXX A lot can be shared with initiator_send_ATTR. */
static int
responder_send_ATTR (struct message *msg)
{
struct exchange *exchange = msg->exchange;
struct ipsec_exch *ie = exchange->data;
struct sa *isakmp_sa = msg->isakmp_sa;
struct ipsec_sa *isa = isakmp_sa->data;
struct hash *hash = hash_get (isa->hash);
struct prf *prf;
size_t hashsize = hash->hashsize;
u_int8_t *hashp = 0, *attrp;
size_t attrlen, off;
struct isakmp_cfg_attr *attr;
struct sockaddr *sa;
u_int32_t value;
char *id_string;
/*
* XXX I can only assume it is the client who was the initiator
* in phase 1, but I have not thought it through thoroughly.
*/
id_string = ipsec_id_string (isakmp_sa->id_i, isakmp_sa->id_i_len);
if (!id_string)
{
log_print ("responder_send_ATTR: cannot parse client's ID");
goto fail;
}
if (exchange->phase == 2)
{
/* We want a HASH payload to start with. XXX Share with others? */
hashp = malloc (ISAKMP_HASH_SZ + hashsize);
if (!hashp)
{
log_error ("responder_send_ATTR: malloc (%d) failed",
ISAKMP_HASH_SZ + hashsize);
goto fail;
}
if (message_add_payload (msg, ISAKMP_PAYLOAD_HASH, hashp,
ISAKMP_HASH_SZ + hashsize, 1))
{
free (hashp);
goto fail;
}
}
/* Compute reply attribute payload length. */
attrlen = ISAKMP_ATTRIBUTE_SZ;
for (attr = LIST_FIRST (&ie->attrs); attr; attr = LIST_NEXT (attr, link))
{
switch (attr->type)
{
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
case ISAKMP_CFG_ATTR_INTERNAL_ADDRESS_EXPIRY:
attr->length = 4;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET:
attr->length = 8;
break;
case ISAKMP_CFG_ATTR_APPLICATION_VERSION:
/* XXX So far no version identifier of isakmpd here. */
attr->length = 0;
break;
case ISAKMP_CFG_ATTR_SUPPORTED_ATTRIBUTES:
attr->length = 2 * 15;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
attr->length = 16;
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET:
attr->length = 17;
break;
default:
attr->ignore++;
/* XXX Log! */
}
attrlen += ISAKMP_ATTR_SZ + attr->length;
}
attrp = calloc (1, attrlen);
if (!attrp)
{
log_error ("responder_send_ATTR: calloc (1, %d) failed", attrlen);
goto fail;
}
if (message_add_payload (msg, ISAKMP_PAYLOAD_ATTRIBUTE, attrp, attrlen, 1))
{
free (attrp);
goto fail;
}
SET_ISAKMP_ATTRIBUTE_TYPE (attrp, ISAKMP_CFG_REPLY);
SET_ISAKMP_ATTRIBUTE_ID (attrp, ie->cfg_id);
off = ISAKMP_ATTRIBUTE_SZ;
for (attr = LIST_FIRST (&ie->attrs); attr;
off += ISAKMP_ATTR_SZ + attr->length, attr = LIST_NEXT (attr, link))
{
SET_ISAKMP_ATTR_TYPE (attrp + off, attr->type);
switch (attr->type)
{
case ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS:
sa = conf_get_address (id_string, "Address");
if (!sa)
{
/* XXX What to do? */
attr->length = 0;
break;
}
if ((attr->type == ISAKMP_CFG_ATTR_INTERNAL_IP4_ADDRESS
&& sa->sa_family != AF_INET)
|| (attr->type == ISAKMP_CFG_ATTR_INTERNAL_IP6_ADDRESS
&& sa->sa_family != AF_INET6))
{
/* XXX What to do? */
free (sa);
attr->length = 0;
break;
}
memcpy (attrp + off + ISAKMP_ATTR_VALUE_OFF, sockaddr_addrdata (sa),
attr->length);
free (sa);
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NETMASK:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NETMASK:
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_SUBNET:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_SUBNET:
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DHCP:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DHCP:
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS:
sa = conf_get_address (id_string, "Nameserver");
if (!sa)
{
/* XXX What to do? */
attr->length = 0;
break;
}
if ((attr->type == ISAKMP_CFG_ATTR_INTERNAL_IP4_DNS
&& sa->sa_family != AF_INET)
|| (attr->type == ISAKMP_CFG_ATTR_INTERNAL_IP6_DNS
&& sa->sa_family != AF_INET6))
{
/* XXX What to do? */
attr->length = 0;
free (sa);
break;
}
memcpy (attrp + off + ISAKMP_ATTR_VALUE_OFF, sockaddr_addrdata (sa),
attr->length);
free (sa);
break;
case ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS:
case ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS:
sa = conf_get_address (id_string, "WINS-server");
if (!sa)
{
/* XXX What to do? */
attr->length = 0;
break;
}
if ((attr->type == ISAKMP_CFG_ATTR_INTERNAL_IP4_NBNS
&& sa->sa_family != AF_INET)
|| (attr->type == ISAKMP_CFG_ATTR_INTERNAL_IP6_NBNS
&& sa->sa_family != AF_INET6))
{
/* XXX What to do? */
attr->length = 0;
free (sa);
break;
}
memcpy (attrp + off + ISAKMP_ATTR_VALUE_OFF, sockaddr_addrdata (sa),
attr->length);
free (sa);
break;
case ISAKMP_CFG_ATTR_INTERNAL_ADDRESS_EXPIRY:
value = conf_get_num (id_string, "Lifetime", 1200);
encode_32 (attrp + off + ISAKMP_ATTR_VALUE_OFF, value);
break;
case ISAKMP_CFG_ATTR_APPLICATION_VERSION:
/* XXX So far no version identifier of isakmpd here. */
break;
case ISAKMP_CFG_ATTR_SUPPORTED_ATTRIBUTES:
break;
default:
}
SET_ISAKMP_ATTR_LENGTH_VALUE (attrp + off, attr->length);
}
if (exchange->phase == 2)
{
prf = prf_alloc (isa->prf_type, isa->hash, isa->skeyid_a,
isa->skeyid_len);
if (!prf)
{
/* XXX Log? */
goto fail;
}
prf->Init (prf->prfctx);
prf->Update (prf->prfctx, exchange->message_id,
ISAKMP_HDR_MESSAGE_ID_LEN);
prf->Update (prf->prfctx, attrp, attrlen);
prf->Final (hashp + ISAKMP_GEN_SZ, prf->prfctx);
prf_free (prf);
}
return 0;
fail:
if (id_string)
free (id_string);
return -1;
}
/*
* Decode the attribute of type TYPE with a LEN length value pointed to by
* VALUE. VIE is a pointer to the IPsec exchange context holding the
* attributes indexed by type for easy retrieval.
*/
static int
decode_attribute (u_int16_t type, u_int8_t *value, u_int16_t len, void *vie)
{
struct ipsec_exch *ie = vie;
struct isakmp_cfg_attr *attr;
if (type >= ISAKMP_CFG_ATTR_PRIVATE_MIN
&& type <= ISAKMP_CFG_ATTR_PRIVATE_MAX)
return 0;
if (type == 0 || type >= ISAKMP_CFG_ATTR_FUTURE_MIN)
/* XXX Log! */
return -1;
attr = calloc (1, sizeof *attr);
if (!attr)
{
log_error ("decode_attribute: calloc (1, %d) failed", sizeof *attr);
return -1;
}
attr->type = type;
attr->length = len;
if (len)
{
attr->value = malloc (len);
if (!attr->value)
{
log_error ("decode_attribute: malloc (%d) failed", len);
free (attr);
/* Should we also deallocate all other values? */
return -1;
}
memcpy (attr->value, value, len);
}
LIST_INSERT_HEAD (&ie->attrs, attr, link);
return 0;
}
|