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/* $Id: sysdep.c,v 1.1 1999/02/26 03:59:18 niklas Exp $ */
/*
* Copyright (c) 1998 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 Ericsson Radio Systems.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/encap.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include "sysdep.h"
#ifdef NEED_SYSDEP_APP
#include "app.h"
#include "conf.h"
#include "ipsec.h"
#endif NEED_SYSDEP_APP
#include "log.h"
#ifdef USE_PF_KEY_V2
#include "pf_key_v2.h"
#define KEY_API(x) pf_key_v2_##x
#else
#include "pf_encap.h"
#define KEY_API(x) pf_encap_##x
#endif
extern char *__progname;
/*
* This is set to true in case of regression-test mode, when it will
* cause predictable random numbers be generated.
*/
int regrand = 0;
/*
* An as strong as possible random number generator, reverting to a
* deterministic pseudo-random one if regrand is set.
*/
u_int32_t
sysdep_random ()
{
if (!regrand)
return arc4random ();
else
return random();
}
/* Return the basename of the command used to invoke us. */
char *
sysdep_progname ()
{
return __progname;
}
/* As regress/ use this file I protect the sysdep_app_* stuff like this. */
#ifdef NEED_SYSDEP_APP
/*
* Prepare the application we negotiate SAs for (i.e. the IPsec stack)
* for communication. We return a file descriptor useable to select(2) on.
*/
int
sysdep_app_open ()
{
return KEY_API(open) ();
}
/*
* When select(2) has noticed our application needs attendance, this is what
* gets called. FD is the file descriptor causing the alarm.
*/
void
sysdep_app_handler (int fd)
{
KEY_API (handler) (fd);
}
/*
* This is where we try to set up routes that make the IP-stack request
* SAs from us on demand.
*/
void
sysdep_conf_init_hook ()
{
struct conf_list *conns;
struct conf_list_node *conn;
char *conf, *doi_str, *local_id, *remote_id, *peer, *address;
struct in_addr laddr, lmask, raddr, rmask, gwaddr;
int lid, rid;
conns = conf_get_list ("Phase 2", "Connections");
for (conn = TAILQ_FIRST (&conns->fields); conn;
conn = TAILQ_NEXT (conn, link))
{
/* Figure out the DOI. We only handle IPsec so far. */
conf = conf_get_str (conn->field, "Configuration");
if (!conf)
{
log_print ("sysdep_conf_init_hook: "
"No \"Configuration\" specified for %s",
conn->field);
continue;
}
doi_str = conf_get_str (conf, "DOI");
if (!doi_str)
{
log_print ("sysdep_conf_init_hook: No DOI specified for %s", conf);
continue;
}
if (strcasecmp (doi_str, "IPSEC") != 0)
{
log_print ("sysdep_conf_init_hook: DOI \"%s\" unsupported", doi_str);
continue;
}
local_id = conf_get_str (conn->field, "Local-ID");
remote_id = conf_get_str (conn->field, "Remote-ID");
/*
* At the moment I only do on-demand keying for modes with client IDs.
*/
if (!local_id || !remote_id)
{
log_print ("sysdep_conf_init_hook: "
"Both Local-ID and Remote-ID required for %s",
conn->field);
continue;
}
if (ipsec_get_id (local_id, &lid, &laddr, &lmask))
continue;
if (ipsec_get_id (remote_id, &rid, &raddr, &rmask))
continue;
peer = conf_get_str (conn->field, "ISAKMP-peer");
if (!peer)
{
log_print ("sysdep_conf_init_hook: "
"section %s has no \"ISAKMP-peer\" tag", conn->field);
continue;
}
address = conf_get_str (peer, "Address");
if (!address)
{
log_print ("sysdep_conf_init_hook: "
"section %s has no \"Address\" tag", peer);
continue;
}
if (!inet_aton (address, &gwaddr))
{
log_print ("sysdep_conf_init_hook: invalid adress %s in section %s",
address, peer);
continue;
}
/* XXX The special SPI below needs to be symbolic. */
if (KEY_API(route) (laddr.s_addr, lmask.s_addr, raddr.s_addr,
rmask.s_addr, 1, gwaddr.s_addr, conn->field))
/* XXX What else? */
continue;
}
}
/*
* Generate a SPI for protocol PROTO and the destination signified by
* ID & ID_SZ. Stash the SPI size in SZ.
*/
u_int8_t *
sysdep_ipsec_get_spi (size_t *sz, u_int8_t proto, void *id, size_t id_sz)
{
if (app_none)
{
*sz = IPSEC_SPI_SIZE;
/* XXX should be random instead I think. */
return strdup ("\x12\x34\x56\x78");
}
return KEY_API (get_spi) (sz, proto, id, id_sz);
}
/* Force communication on socket FD to go in the clear. */
int
sysdep_cleartext (int fd)
{
int level;
if (app_none)
return 0;
/*
* Need to bypass system security policy, so I can send and
* receive key management datagrams in the clear.
*/
level = IPSEC_LEVEL_BYPASS;
if (setsockopt (fd, IPPROTO_IP, IP_AUTH_LEVEL, (char *)&level, sizeof level)
== -1)
{
log_error ("sysdep_cleartext: "
"setsockopt (%d, IPPROTO_IP, IP_AUTH_LEVEL, ...) failed", fd);
return -1;
}
if (setsockopt (fd, IPPROTO_IP, IP_ESP_TRANS_LEVEL, (char *)&level,
sizeof level) == -1)
{
log_error ("sysdep_cleartext: "
"setsockopt (%d, IPPROTO_IP, IP_ESP_TRANS_LEVEL, ...) "
"failed", fd);
return -1;
}
if (setsockopt (fd, IPPROTO_IP, IP_ESP_NETWORK_LEVEL, (char *)&level,
sizeof level) == -1)
{
log_error("sysdep_cleartext: "
"setsockopt (%d, IPPROTO_IP, IP_ESP_NETWORK_LEVEL, ...) "
"failed", fd);
return -1;
}
return 0;
}
int
sysdep_ipsec_delete_spi (struct sa *sa, struct proto *proto, int initiator)
{
if (app_none)
return 0;
return KEY_API (delete_spi) (sa, proto, initiator);
}
int
sysdep_ipsec_enable_sa (struct sa *sa, int initiator)
{
if (app_none)
return 0;
return KEY_API (enable_sa) (sa, initiator);
}
int
sysdep_ipsec_group_spis (struct sa *sa, struct proto *proto1,
struct proto *proto2, int role)
{
if (app_none)
return 0;
return KEY_API (group_spis) (sa, proto1, proto2, role);
}
int
sysdep_ipsec_set_spi (struct sa *sa, struct proto *proto, int role,
int initiator)
{
if (app_none)
return 0;
return KEY_API (set_spi) (sa, proto, role, initiator);
}
#endif
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