#include <machine/rtems-bsd-kernel-space.h>
/*-
* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <rtems/bsd/local/opt_inet.h>
#include <rtems/bsd/local/opt_inet6.h>
#include <rtems/bsd/local/opt_ipsec.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/socket.h>
#include <sys/sockopt.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#include <netipsec/ipsec_support.h>
#include <netipsec/key.h>
#include <netipsec/key_debug.h>
MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy");
static void
ipsec_setsockaddrs_inpcb(struct inpcb *inp, union sockaddr_union *src,
union sockaddr_union *dst, u_int dir)
{
#ifdef INET6
if (inp->inp_vflag & INP_IPV6) {
struct sockaddr_in6 *sin6;
bzero(&src->sin6, sizeof(src->sin6));
bzero(&dst->sin6, sizeof(dst->sin6));
src->sin6.sin6_family = AF_INET6;
src->sin6.sin6_len = sizeof(struct sockaddr_in6);
dst->sin6.sin6_family = AF_INET6;
dst->sin6.sin6_len = sizeof(struct sockaddr_in6);
if (dir == IPSEC_DIR_OUTBOUND)
sin6 = &src->sin6;
else
sin6 = &dst->sin6;
sin6->sin6_addr = inp->in6p_laddr;
sin6->sin6_port = inp->inp_lport;
if (IN6_IS_SCOPE_LINKLOCAL(&inp->in6p_laddr)) {
/* XXXAE: use in6p_zoneid */
sin6->sin6_addr.s6_addr16[1] = 0;
sin6->sin6_scope_id = ntohs(
inp->in6p_laddr.s6_addr16[1]);
}
if (dir == IPSEC_DIR_OUTBOUND)
sin6 = &dst->sin6;
else
sin6 = &src->sin6;
sin6->sin6_addr = inp->in6p_faddr;
sin6->sin6_port = inp->inp_fport;
if (IN6_IS_SCOPE_LINKLOCAL(&inp->in6p_faddr)) {
/* XXXAE: use in6p_zoneid */
sin6->sin6_addr.s6_addr16[1] = 0;
sin6->sin6_scope_id = ntohs(
inp->in6p_faddr.s6_addr16[1]);
}
}
#endif
#ifdef INET
if (inp->inp_vflag & INP_IPV4) {
struct sockaddr_in *sin;
bzero(&src->sin, sizeof(src->sin));
bzero(&dst->sin, sizeof(dst->sin));
src->sin.sin_family = AF_INET;
src->sin.sin_len = sizeof(struct sockaddr_in);
dst->sin.sin_family = AF_INET;
dst->sin.sin_len = sizeof(struct sockaddr_in);
if (dir == IPSEC_DIR_OUTBOUND)
sin = &src->sin;
else
sin = &dst->sin;
sin->sin_addr = inp->inp_laddr;
sin->sin_port = inp->inp_lport;
if (dir == IPSEC_DIR_OUTBOUND)
sin = &dst->sin;
else
sin = &src->sin;
sin->sin_addr = inp->inp_faddr;
sin->sin_port = inp->inp_fport;
}
#endif
}
void
ipsec_setspidx_inpcb(struct inpcb *inp, struct secpolicyindex *spidx,
u_int dir)
{
ipsec_setsockaddrs_inpcb(inp, &spidx->src, &spidx->dst, dir);
#ifdef INET6
if (inp->inp_vflag & INP_IPV6) {
spidx->prefs = sizeof(struct in6_addr) << 3;
spidx->prefd = sizeof(struct in6_addr) << 3;
}
#endif
#ifdef INET
if (inp->inp_vflag & INP_IPV4) {
spidx->prefs = sizeof(struct in_addr) << 3;
spidx->prefd = sizeof(struct in_addr) << 3;
}
#endif
spidx->ul_proto = IPPROTO_TCP; /* XXX: currently only TCP uses this */
spidx->dir = dir;
KEYDBG(IPSEC_DUMP,
printf("%s: ", __func__); kdebug_secpolicyindex(spidx, NULL));
}
/* Initialize PCB policy. */
int
ipsec_init_pcbpolicy(struct inpcb *inp)
{
IPSEC_ASSERT(inp != NULL, ("null inp"));
IPSEC_ASSERT(inp->inp_sp == NULL, ("inp_sp already initialized"));
inp->inp_sp = malloc(sizeof(struct inpcbpolicy), M_IPSEC_INPCB,
M_NOWAIT | M_ZERO);
if (inp->inp_sp == NULL)
return (ENOBUFS);
return (0);
}
/* Delete PCB policy. */
int
ipsec_delete_pcbpolicy(struct inpcb *inp)
{
if (inp->inp_sp == NULL)
return (0);
if (inp->inp_sp->sp_in != NULL)
key_freesp(&inp->inp_sp->sp_in);
if (inp->inp_sp->sp_out != NULL)
key_freesp(&inp->inp_sp->sp_out);
free(inp->inp_sp, M_IPSEC_INPCB);
inp->inp_sp = NULL;
return (0);
}
/* Deep-copy a policy in PCB. */
static struct secpolicy *
ipsec_deepcopy_pcbpolicy(struct secpolicy *src)
{
struct secpolicy *dst;
int i;
if (src == NULL)
return (NULL);
IPSEC_ASSERT(src->state == IPSEC_SPSTATE_PCB, ("SP isn't PCB"));
dst = key_newsp();
if (dst == NULL)
return (NULL);
/* spidx is not copied here */
dst->policy = src->policy;
dst->state = src->state;
dst->priority = src->priority;
/* Do not touch the refcnt field. */
/* Copy IPsec request chain. */
for (i = 0; i < src->tcount; i++) {
dst->req[i] = ipsec_newisr();
if (dst->req[i] == NULL) {
key_freesp(&dst);
return (NULL);
}
bcopy(src->req[i], dst->req[i], sizeof(struct ipsecrequest));
dst->tcount++;
}
KEYDBG(IPSEC_DUMP,
printf("%s: copied SP(%p) -> SP(%p)\n", __func__, src, dst);
kdebug_secpolicy(dst));
return (dst);
}
/*
* Copy IPsec policy from old INPCB into new.
* It is expected that new INPCB has not configured policies.
*/
int
ipsec_copy_pcbpolicy(struct inpcb *old, struct inpcb *new)
{
struct secpolicy *sp;
/*
* old->inp_sp can be NULL if PCB was created when an IPsec
* support was unavailable. This is not an error, we don't have
* policies in this PCB, so nothing to copy.
*/
if (old->inp_sp == NULL)
return (0);
IPSEC_ASSERT(new->inp_sp != NULL, ("new inp_sp is NULL"));
IPSEC_ASSERT((new->inp_sp->flags & (
INP_INBOUND_POLICY | INP_OUTBOUND_POLICY)) == 0,
("new PCB already has configured policies"));
INP_WLOCK_ASSERT(new);
INP_LOCK_ASSERT(old);
if (old->inp_sp->flags & INP_INBOUND_POLICY) {
sp = ipsec_deepcopy_pcbpolicy(old->inp_sp->sp_in);
if (sp == NULL)
return (ENOBUFS);
ipsec_setspidx_inpcb(new, &sp->spidx, IPSEC_DIR_INBOUND);
if (new->inp_sp->sp_in != NULL)
key_freesp(&new->inp_sp->sp_in);
new->inp_sp->sp_in = sp;
new->inp_sp->flags |= INP_INBOUND_POLICY;
}
if (old->inp_sp->flags & INP_OUTBOUND_POLICY) {
sp = ipsec_deepcopy_pcbpolicy(old->inp_sp->sp_out);
if (sp == NULL)
return (ENOBUFS);
ipsec_setspidx_inpcb(new, &sp->spidx, IPSEC_DIR_OUTBOUND);
if (new->inp_sp->sp_out != NULL)
key_freesp(&new->inp_sp->sp_out);
new->inp_sp->sp_out = sp;
new->inp_sp->flags |= INP_OUTBOUND_POLICY;
}
return (0);
}
static int
ipsec_set_pcbpolicy(struct inpcb *inp, struct ucred *cred,
void *request, size_t len)
{
struct sadb_x_policy *xpl;
struct secpolicy **spp, *newsp;
int error, flags;
xpl = (struct sadb_x_policy *)request;
/* Select direction. */
switch (xpl->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
xpl->sadb_x_policy_dir));
return (EINVAL);
}
/*
* Privileged sockets are allowed to set own security policy
* and configure IPsec bypass. Unprivileged sockets only can
* have ENTRUST policy.
*/
switch (xpl->sadb_x_policy_type) {
case IPSEC_POLICY_IPSEC:
case IPSEC_POLICY_BYPASS:
if (cred != NULL &&
priv_check_cred(cred, PRIV_NETINET_IPSEC) != 0)
return (EACCES);
/* Allocate new SP entry. */
newsp = key_msg2sp(xpl, len, &error);
if (newsp == NULL)
return (error);
newsp->state = IPSEC_SPSTATE_PCB;
newsp->spidx.ul_proto = IPSEC_ULPROTO_ANY;
#ifdef INET
if (inp->inp_vflag & INP_IPV4) {
newsp->spidx.src.sin.sin_family =
newsp->spidx.dst.sin.sin_family = AF_INET;
newsp->spidx.src.sin.sin_len =
newsp->spidx.dst.sin.sin_len =
sizeof(struct sockaddr_in);
}
#endif
#ifdef INET6
if (inp->inp_vflag & INP_IPV6) {
newsp->spidx.src.sin6.sin6_family =
newsp->spidx.dst.sin6.sin6_family = AF_INET6;
newsp->spidx.src.sin6.sin6_len =
newsp->spidx.dst.sin6.sin6_len =
sizeof(struct sockaddr_in6);
}
#endif
break;
case IPSEC_POLICY_ENTRUST:
/* We just use NULL pointer for ENTRUST policy */
newsp = NULL;
break;
default:
/* Other security policy types aren't allowed for PCB */
return (EINVAL);
}
INP_WLOCK(inp);
if (xpl->sadb_x_policy_dir == IPSEC_DIR_INBOUND) {
spp = &inp->inp_sp->sp_in;
flags = INP_INBOUND_POLICY;
} else {
spp = &inp->inp_sp->sp_out;
flags = INP_OUTBOUND_POLICY;
}
/* Clear old SP and set new SP. */
if (*spp != NULL)
key_freesp(spp);
*spp = newsp;
KEYDBG(IPSEC_DUMP,
printf("%s: new SP(%p)\n", __func__, newsp));
if (newsp == NULL)
inp->inp_sp->flags &= ~flags;
else {
inp->inp_sp->flags |= flags;
KEYDBG(IPSEC_DUMP, kdebug_secpolicy(newsp));
}
INP_WUNLOCK(inp);
return (0);
}
static int
ipsec_get_pcbpolicy(struct inpcb *inp, void *request, size_t *len)
{
struct sadb_x_policy *xpl;
struct secpolicy *sp;
int error, flags;
xpl = (struct sadb_x_policy *)request;
INP_RLOCK(inp);
flags = inp->inp_sp->flags;
/* Select direction. */
switch (xpl->sadb_x_policy_dir) {
case IPSEC_DIR_INBOUND:
sp = inp->inp_sp->sp_in;
flags &= INP_INBOUND_POLICY;
break;
case IPSEC_DIR_OUTBOUND:
sp = inp->inp_sp->sp_out;
flags &= INP_OUTBOUND_POLICY;
break;
default:
INP_RUNLOCK(inp);
ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__,
xpl->sadb_x_policy_dir));
return (EINVAL);
}
if (flags == 0) {
/* Return ENTRUST policy */
INP_RUNLOCK(inp);
xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY;
xpl->sadb_x_policy_type = IPSEC_POLICY_ENTRUST;
xpl->sadb_x_policy_id = 0;
xpl->sadb_x_policy_priority = 0;
xpl->sadb_x_policy_len = PFKEY_UNIT64(sizeof(*xpl));
*len = sizeof(*xpl);
return (0);
}
IPSEC_ASSERT(sp != NULL,
("sp is NULL, but flags is 0x%04x", inp->inp_sp->flags));
key_addref(sp);
INP_RUNLOCK(inp);
error = key_sp2msg(sp, request, len);
key_freesp(&sp);
if (error == EINVAL)
return (error);
/*
* We return "success", but user should check *len.
* *len will be set to size of valid data and
* sadb_x_policy_len will contain needed size.
*/
return (0);
}
/* Handle socket option control request for PCB */
static int
ipsec_control_pcbpolicy(struct inpcb *inp, struct sockopt *sopt)
{
void *optdata;
size_t optlen;
int error;
if (inp->inp_sp == NULL)
return (ENOPROTOOPT);
/* Limit maximum request size to PAGE_SIZE */
optlen = sopt->sopt_valsize;
if (optlen < sizeof(struct sadb_x_policy) || optlen > PAGE_SIZE)
return (EINVAL);
optdata = malloc(optlen, M_TEMP, sopt->sopt_td ? M_WAITOK: M_NOWAIT);
if (optdata == NULL)
return (ENOBUFS);
/*
* We need a hint from the user, what policy is requested - input
* or output? User should specify it in the buffer, even for
* setsockopt().
*/
error = sooptcopyin(sopt, optdata, optlen, optlen);
if (error == 0) {
if (sopt->sopt_dir == SOPT_SET)
error = ipsec_set_pcbpolicy(inp,
sopt->sopt_td ? sopt->sopt_td->td_ucred: NULL,
optdata, optlen);
else {
error = ipsec_get_pcbpolicy(inp, optdata, &optlen);
if (error == 0)
error = sooptcopyout(sopt, optdata, optlen);
}
}
free(optdata, M_TEMP);
return (error);
}
#ifdef INET
/*
* IPSEC_PCBCTL() method implementation for IPv4.
*/
int
ipsec4_pcbctl(struct inpcb *inp, struct sockopt *sopt)
{
if (sopt->sopt_name != IP_IPSEC_POLICY)
return (ENOPROTOOPT);
return (ipsec_control_pcbpolicy(inp, sopt));
}
#endif
#ifdef INET6
/*
* IPSEC_PCBCTL() method implementation for IPv6.
*/
int
ipsec6_pcbctl(struct inpcb *inp, struct sockopt *sopt)
{
if (sopt->sopt_name != IPV6_IPSEC_POLICY)
return (ENOPROTOOPT);
return (ipsec_control_pcbpolicy(inp, sopt));
}
#endif
