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/* $OpenBSD: sysdep.c,v 1.20 2001/08/23 19:07:00 niklas Exp $ */
/* $EOM: sysdep.c,v 1.9 2000/12/04 04:46:35 angelos Exp $ */
/*
* Copyright (c) 1998, 1999 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/errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include "sysdep.h"
#include "util.h"
#ifdef NEED_SYSDEP_APP
#include "app.h"
#include "conf.h"
#include "ipsec.h"
#ifdef USE_PF_KEY_V2
#include "pf_key_v2.h"
#define KEY_API(x) pf_key_v2_##x
#endif
#endif /* NEED_SYSDEP_APP */
#include "log.h"
extern char *__progname;
/*
* 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);
}
/* Check that the connection named NAME is active, or else make it active. */
void
sysdep_connection_check (char *name)
{
KEY_API (connection_check) (name);
}
/*
* Generate a SPI for protocol PROTO and the source/destination pair given by
* SRC, SRCLEN, DST & DSTLEN. Stash the SPI size in SZ.
*/
u_int8_t *
sysdep_ipsec_get_spi (size_t *sz, u_int8_t proto, struct sockaddr *src,
struct sockaddr *dst, u_int32_t seq)
{
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, src, dst, seq);
}
/* Force communication on socket FD to go in the clear. */
int
sysdep_cleartext (int fd, int af)
{
int level, sw;
struct {
int ip_proto; /* IP protocol */
int auth_level;
int esp_trans_level;
int esp_network_level;
int ipcomp_level;
} optsw[] =
{
{
IPPROTO_IP,
IP_AUTH_LEVEL,
IP_ESP_TRANS_LEVEL,
IP_ESP_NETWORK_LEVEL,
#ifdef IP_IPCOMP_LEVEL
IP_IPCOMP_LEVEL
#else
0
#endif
},
{
IPPROTO_IPV6,
IPV6_AUTH_LEVEL,
IPV6_ESP_TRANS_LEVEL,
IPV6_ESP_NETWORK_LEVEL,
#ifdef IPV6_IPCOMP_LEVEL
IPV6_IPCOMP_LEVEL
#else
0
#endif
},
};
if (app_none)
return 0;
switch (af)
{
case AF_INET:
sw = 0;
break;
case AF_INET6:
sw = 1;
break;
default:
log_print ("sysdep_cleartext: unsupported protocol family %d", af);
return -1;
}
/*
* 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, optsw[sw].ip_proto, optsw[sw].auth_level, (char *)&level,
sizeof level) == -1)
{
log_error ("sysdep_cleartext: "
"setsockopt (%d, %d, IP_AUTH_LEVEL, ...) failed", fd,
optsw[sw].ip_proto);
return -1;
}
if (setsockopt (fd, optsw[sw].ip_proto, optsw[sw].esp_trans_level,
(char *)&level, sizeof level) == -1)
{
log_error ("sysdep_cleartext: "
"setsockopt (%d, %d, IP_ESP_TRANS_LEVEL, ...) failed", fd,
optsw[sw].ip_proto);
return -1;
}
if (setsockopt (fd, optsw[sw].ip_proto, optsw[sw].esp_network_level,
(char *)&level, sizeof level) == -1)
{
log_error("sysdep_cleartext: "
"setsockopt (%d, %d, IP_ESP_NETWORK_LEVEL, ...) failed", fd,
optsw[sw].ip_proto);
return -1;
}
if (optsw[sw].ipcomp_level
&& setsockopt (fd, optsw[sw].ip_proto, optsw[sw].ipcomp_level,
(char *)&level, sizeof level) == -1
&& errno != ENOPROTOOPT)
{
log_error("sysdep_cleartext: "
"setsockopt (%d, %d, IP_IPCOMP_LEVEL, ...) failed,", fd,
optsw[sw].ip_proto);
return -1;
}
return 0;
}
int
sysdep_ipsec_delete_spi (struct sa *sa, struct proto *proto, int incoming)
{
if (app_none)
return 0;
return KEY_API (delete_spi) (sa, proto, incoming);
}
int
sysdep_ipsec_enable_sa (struct sa *sa, struct sa *isakmp_sa)
{
if (app_none)
return 0;
return KEY_API (enable_sa) (sa, isakmp_sa);
}
int
sysdep_ipsec_group_spis (struct sa *sa, struct proto *proto1,
struct proto *proto2, int incoming)
{
if (app_none)
return 0;
return KEY_API (group_spis) (sa, proto1, proto2, incoming);
}
int
sysdep_ipsec_set_spi (struct sa *sa, struct proto *proto, int incoming,
struct sa *isakmp_sa)
{
if (app_none)
return 0;
return KEY_API (set_spi) (sa, proto, incoming, isakmp_sa);
}
#endif
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