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strongswan/src/pluto/kernel.c

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/* routines that interface with the kernel's IPsec mechanism
*
* Copyright (C) 2010 Tobias Brunner
* Copyright (C) 2009 Andreas Steffen
* Hochschule fuer Technik Rapperswil
*
* Copyright (C) 1998-2002 D. Hugh Redelmeier
* Copyright (C) 1997 Angelos D. Keromytis
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <freeswan.h>
#include <library.h>
#include <hydra.h>
#include <crypto/rngs/rng.h>
#include <kernel/kernel_listener.h>
#include <signal.h>
#include <sys/time.h> /* for select(2) */
#include <sys/types.h> /* for select(2) */
#include <pfkeyv2.h>
#include <pfkey.h>
#include "kameipsec.h"
#include "constants.h"
#include "defs.h"
#include "connections.h"
#include "state.h"
#include "timer.h"
#include "kernel.h"
#include "kernel_pfkey.h"
#include "log.h"
#include "ca.h"
#include "server.h"
#include "whack.h" /* for RC_LOG_SERIOUS */
#include "keys.h"
#include "crypto.h"
#include "nat_traversal.h"
#include "alg_info.h"
#include "kernel_alg.h"
#include "pluto.h"
bool can_do_IPcomp = TRUE; /* can system actually perform IPCOMP? */
/* test if the routes required for two different connections agree
* It is assumed that the destination subnets agree; we are only
* testing that the interfaces and nexthops match.
*/
#define routes_agree(c, d) ((c)->interface == (d)->interface \
&& sameaddr(&(c)->spd.this.host_nexthop, &(d)->spd.this.host_nexthop))
/* forward declaration */
static bool shunt_eroute(connection_t *c, struct spd_route *sr,
enum routing_t rt_kind, unsigned int op,
const char *opname);
static void set_text_said(char *text_said, const ip_address *dst,
ipsec_spi_t spi, int proto);
/**
* Default IPsec SA config (e.g. to install trap policies).
*/
static ipsec_sa_cfg_t null_ipsec_sa = {
.mode = MODE_TRANSPORT,
.esp = {
.use = TRUE,
},
};
/**
* Helper function that converts an ip_subnet to a traffic_selector_t.
*/
static traffic_selector_t *traffic_selector_from_subnet(const ip_subnet *client,
const u_int8_t proto)
{
traffic_selector_t *ts;
host_t *net;
net = host_create_from_sockaddr((sockaddr_t*)&client->addr);
ts = traffic_selector_create_from_subnet(net, client->maskbits, proto,
net->get_port(net));
return ts;
}
/**
* Helper function that converts a traffic_selector_t to an ip_subnet.
*/
static ip_subnet subnet_from_traffic_selector(traffic_selector_t *ts)
{
ip_subnet subnet;
host_t *net;
u_int8_t mask;
ts->to_subnet(ts, &net, &mask);
subnet.addr = *(ip_address*)net->get_sockaddr(net);
subnet.maskbits = mask;
net->destroy(net);
return subnet;
}
void record_and_initiate_opportunistic(const ip_subnet *ours,
const ip_subnet *his,
int transport_proto, const char *why)
{
ip_address src, dst;
passert(samesubnettype(ours, his));
/* actually initiate opportunism */
networkof(ours, &src);
networkof(his, &dst);
initiate_opportunistic(&src, &dst, transport_proto, TRUE, NULL_FD);
}
/* Generate Unique SPI numbers.
*
* The returned SPI is in network byte order.
*/
ipsec_spi_t get_ipsec_spi(ipsec_spi_t avoid, int proto, struct spd_route *sr,
bool tunnel)
{
host_t *host_src, *host_dst;
u_int32_t spi;
host_src = host_create_from_sockaddr((sockaddr_t*)&sr->that.host_addr);
host_dst = host_create_from_sockaddr((sockaddr_t*)&sr->this.host_addr);
if (hydra->kernel_interface->get_spi(hydra->kernel_interface, host_src,
host_dst, proto, sr->reqid, &spi) != SUCCESS)
{
spi = 0;
}
host_src->destroy(host_src);
host_dst->destroy(host_dst);
return spi;
}
/* Generate Unique CPI numbers.
* The result is returned as an SPI (4 bytes) in network order!
* The real bits are in the nework-low-order 2 bytes.
*/
ipsec_spi_t get_my_cpi(struct spd_route *sr, bool tunnel)
{
host_t *host_src, *host_dst;
u_int16_t cpi;
host_src = host_create_from_sockaddr((sockaddr_t*)&sr->that.host_addr);
host_dst = host_create_from_sockaddr((sockaddr_t*)&sr->this.host_addr);
if (hydra->kernel_interface->get_cpi(hydra->kernel_interface, host_src,
host_dst, sr->reqid, &cpi) != SUCCESS)
{
cpi = 0;
}
host_src->destroy(host_src);
host_dst->destroy(host_dst);
return htonl((u_int32_t)ntohs(cpi));
}
/* Replace the shell metacharacters ', \, ", `, and $ in a character string
* by escape sequences consisting of their octal values
*/
static void escape_metachar(const char *src, char *dst, size_t dstlen)
{
while (*src != '\0' && dstlen > 4)
{
switch (*src)
{
case '\'':
case '\\':
case '"':
case '`':
case '$':
sprintf(dst,"\\%s%o", (*src < 64)?"0":"", *src);
dst += 4;
dstlen -= 4;
break;
default:
*dst++ = *src;
dstlen--;
}
src++;
}
*dst = '\0';
}
/* invoke the updown script to do the routing and firewall commands required
*
* The user-specified updown script is run. Parameters are fed to it in
* the form of environment variables. All such environment variables
* have names starting with "PLUTO_".
*
* The operation to be performed is specified by PLUTO_VERB. This
* verb has a suffix "-host" if the client on this end is just the
* host; otherwise the suffix is "-client". If the address family
* of the host is IPv6, an extra suffix of "-v6" is added.
*
* "prepare-host" and "prepare-client" are used to delete a route
* that may exist (due to forces outside of Pluto). It is used to
* prepare for pluto creating a route.
*
* "route-host" and "route-client" are used to install a route.
* Since routing is based only on destination, the PLUTO_MY_CLIENT_*
* values are probably of no use (using them may signify a bug).
*
* "unroute-host" and "unroute-client" are used to delete a route.
* Since routing is based only on destination, the PLUTO_MY_CLIENT_*
* values are probably of no use (using them may signify a bug).
*
* "up-host" and "up-client" are run when an eroute is added (not replaced).
* They are useful for adjusting a firewall: usually for adding a rule
* to let processed packets flow between clients. Note that only
* one eroute may exist for a pair of client subnets but inbound
* IPsec SAs may persist without an eroute.
*
* "down-host" and "down-client" are run when an eroute is deleted.
* They are useful for adjusting a firewall.
*/
#ifndef DEFAULT_UPDOWN
# define DEFAULT_UPDOWN "ipsec _updown"
#endif
static bool do_command(connection_t *c, struct spd_route *sr, struct state *st,
const char *verb)
{
char cmd[1536]; /* arbitrary limit on shell command length */
const char *verb_suffix;
/* figure out which verb suffix applies */
{
const char *hs, *cs;
switch (addrtypeof(&sr->this.host_addr))
{
case AF_INET:
hs = "-host";
cs = "-client";
break;
case AF_INET6:
hs = "-host-v6";
cs = "-client-v6";
break;
default:
loglog(RC_LOG_SERIOUS, "unknown address family");
return FALSE;
}
verb_suffix = subnetisaddr(&sr->this.client, &sr->this.host_addr)
? hs : cs;
}
/* form the command string */
{
char
nexthop_str[sizeof("PLUTO_NEXT_HOP='' ") +ADDRTOT_BUF] = "",
srcip_str[sizeof("PLUTO_MY_SOURCEIP='' ")+ADDRTOT_BUF] = "",
me_str[ADDRTOT_BUF],
myid_str[BUF_LEN],
myclient_str[SUBNETTOT_BUF],
myclientnet_str[ADDRTOT_BUF],
myclientmask_str[ADDRTOT_BUF],
peer_str[ADDRTOT_BUF],
peerid_str[BUF_LEN],
peerclient_str[SUBNETTOT_BUF],
peerclientnet_str[ADDRTOT_BUF],
peerclientmask_str[ADDRTOT_BUF],
peerca_str[BUF_LEN],
mark_in[BUF_LEN] = "",
mark_out[BUF_LEN] = "",
udp_encap[BUF_LEN] = "",
xauth_id_str[BUF_LEN] = "",
secure_myid_str[BUF_LEN] = "",
secure_peerid_str[BUF_LEN] = "",
secure_peerca_str[BUF_LEN] = "",
secure_xauth_id_str[BUF_LEN] = "";
ip_address ta;
pubkey_list_t *p;
if (addrbytesptr(&sr->this.host_nexthop, NULL)
&& !isanyaddr(&sr->this.host_nexthop))
{
char *n;
strcpy(nexthop_str, "PLUTO_NEXT_HOP='");
n = nexthop_str + strlen(nexthop_str);
addrtot(&sr->this.host_nexthop, 0
,n , sizeof(nexthop_str)-strlen(nexthop_str));
strncat(nexthop_str, "' ", sizeof(nexthop_str));
}
if (!sr->this.host_srcip->is_anyaddr(sr->this.host_srcip))
{
char *n;
strcpy(srcip_str, "PLUTO_MY_SOURCEIP='");
n = srcip_str + strlen(srcip_str);
snprintf(n, sizeof(srcip_str)-strlen(srcip_str), "%H",
sr->this.host_srcip);
strncat(srcip_str, "' ", sizeof(srcip_str));
}
if (sr->mark_in.value)
{
snprintf(mark_in, sizeof(mark_in), "PLUTO_MARK_IN='%u/0x%08x' ",
sr->mark_in.value, sr->mark_in.mask);
}
if (sr->mark_out.value)
{
snprintf(mark_out, sizeof(mark_out), "PLUTO_MARK_OUT='%u/0x%08x' ",
sr->mark_out.value, sr->mark_out.mask);
}
if (st && (st->nat_traversal & NAT_T_DETECTED))
{
snprintf(udp_encap, sizeof(udp_encap), "PLUTO_UDP_ENC='%u' ",
sr->that.host_port);
}
addrtot(&sr->this.host_addr, 0, me_str, sizeof(me_str));
snprintf(myid_str, sizeof(myid_str), "%Y", sr->this.id);
escape_metachar(myid_str, secure_myid_str, sizeof(secure_myid_str));
subnettot(&sr->this.client, 0, myclient_str, sizeof(myclientnet_str));
networkof(&sr->this.client, &ta);
addrtot(&ta, 0, myclientnet_str, sizeof(myclientnet_str));
maskof(&sr->this.client, &ta);
addrtot(&ta, 0, myclientmask_str, sizeof(myclientmask_str));
if (c->xauth_identity &&
c->xauth_identity->get_type(c->xauth_identity) != ID_ANY)
{
snprintf(xauth_id_str, sizeof(xauth_id_str), "%Y", c->xauth_identity);
escape_metachar(xauth_id_str, secure_xauth_id_str,
sizeof(secure_xauth_id_str));
snprintf(xauth_id_str, sizeof(xauth_id_str), "PLUTO_XAUTH_ID='%s' ",
secure_xauth_id_str);
}
addrtot(&sr->that.host_addr, 0, peer_str, sizeof(peer_str));
snprintf(peerid_str, sizeof(peerid_str), "%Y", sr->that.id);
escape_metachar(peerid_str, secure_peerid_str, sizeof(secure_peerid_str));
subnettot(&sr->that.client, 0, peerclient_str, sizeof(peerclientnet_str));
networkof(&sr->that.client, &ta);
addrtot(&ta, 0, peerclientnet_str, sizeof(peerclientnet_str));
maskof(&sr->that.client, &ta);
addrtot(&ta, 0, peerclientmask_str, sizeof(peerclientmask_str));
for (p = pubkeys; p != NULL; p = p->next)
{
pubkey_t *key = p->key;
key_type_t type = key->public_key->get_type(key->public_key);
int pathlen;
if (type == KEY_RSA &&
sr->that.id->equals(sr->that.id, key->id) &&
trusted_ca(key->issuer, sr->that.ca, &pathlen))
{
if (key->issuer)
{
snprintf(peerca_str, BUF_LEN, "%Y", key->issuer);
escape_metachar(peerca_str, secure_peerca_str, BUF_LEN);
}
else
{
secure_peerca_str[0] = '\0';
}
break;
}
}
if (-1 == snprintf(cmd, sizeof(cmd)
, "2>&1 " /* capture stderr along with stdout */
"PLUTO_VERSION='1.1' " /* change VERSION when interface spec changes */
"PLUTO_VERB='%s%s' "
"PLUTO_CONNECTION='%s' "
"%s" /* optional PLUTO_NEXT_HOP */
"PLUTO_INTERFACE='%s' "
"%s" /* optional PLUTO_HOST_ACCESS */
"PLUTO_REQID='%u' "
"PLUTO_ME='%s' "
"PLUTO_MY_ID='%s' "
"PLUTO_MY_CLIENT='%s' "
"PLUTO_MY_CLIENT_NET='%s' "
"PLUTO_MY_CLIENT_MASK='%s' "
"PLUTO_MY_PORT='%u' "
"PLUTO_MY_PROTOCOL='%u' "
"PLUTO_PEER='%s' "
"PLUTO_PEER_ID='%s' "
"PLUTO_PEER_CLIENT='%s' "
"PLUTO_PEER_CLIENT_NET='%s' "
"PLUTO_PEER_CLIENT_MASK='%s' "
"PLUTO_PEER_PORT='%u' "
"PLUTO_PEER_PROTOCOL='%u' "
"PLUTO_PEER_CA='%s' "
"%s" /* optional PLUTO_MY_SRCIP */
"%s" /* optional PLUTO_XAUTH_ID */
"%s" /* optional PLUTO_MARK_IN */
"%s" /* optional PLUTO_MARK_OUT */
"%s" /* optional PLUTO_UDP_ENC */
"%s" /* actual script */
, verb, verb_suffix
, c->name
, nexthop_str
, c->interface->vname
, sr->this.hostaccess? "PLUTO_HOST_ACCESS='1' " : ""
, sr->reqid
, me_str
, secure_myid_str
, myclient_str
, myclientnet_str
, myclientmask_str
, sr->this.port
, sr->this.protocol
, peer_str
, secure_peerid_str
, peerclient_str
, peerclientnet_str
, peerclientmask_str
, sr->that.port
, sr->that.protocol
, secure_peerca_str
, srcip_str
, xauth_id_str
, mark_in
, mark_out
, udp_encap
, sr->this.updown == NULL? DEFAULT_UPDOWN : sr->this.updown))
{
loglog(RC_LOG_SERIOUS, "%s%s command too long!", verb, verb_suffix);
return FALSE;
}
}
DBG(DBG_CONTROL, DBG_log("executing %s%s: %s"
, verb, verb_suffix, cmd));
/* invoke the script, catching stderr and stdout
* It may be of concern that some file descriptors will
* be inherited. For the ones under our control, we
* have done fcntl(fd, F_SETFD, FD_CLOEXEC) to prevent this.
* Any used by library routines (perhaps the resolver or syslog)
* will remain.
*/
FILE *f = popen(cmd, "r");
if (f == NULL)
{
loglog(RC_LOG_SERIOUS, "unable to popen %s%s command", verb, verb_suffix);
return FALSE;
}
/* log any output */
for (;;)
{
/* if response doesn't fit in this buffer, it will be folded */
char resp[256];
if (fgets(resp, sizeof(resp), f) == NULL)
{
if (ferror(f))
{
log_errno((e, "fgets failed on output of %s%s command"
, verb, verb_suffix));
return FALSE;
}
else
{
passert(feof(f));
break;
}
}
else
{
char *e = resp + strlen(resp);
if (e > resp && e[-1] == '\n')
e[-1] = '\0'; /* trim trailing '\n' */
plog("%s%s output: %s", verb, verb_suffix, resp);
}
}
/* report on and react to return code */
{
int r = pclose(f);
if (r == -1)
{
log_errno((e, "pclose failed for %s%s command"
, verb, verb_suffix));
return FALSE;
}
else if (WIFEXITED(r))
{
if (WEXITSTATUS(r) != 0)
{
loglog(RC_LOG_SERIOUS, "%s%s command exited with status %d"
, verb, verb_suffix, WEXITSTATUS(r));
return FALSE;
}
}
else if (WIFSIGNALED(r))
{
loglog(RC_LOG_SERIOUS, "%s%s command exited with signal %d"
, verb, verb_suffix, WTERMSIG(r));
return FALSE;
}
else
{
loglog(RC_LOG_SERIOUS, "%s%s command exited with unknown status %d"
, verb, verb_suffix, r);
return FALSE;
}
}
return TRUE;
}
/* Check that we can route (and eroute). Diagnose if we cannot. */
enum routability {
route_impossible = 0,
route_easy = 1,
route_nearconflict = 2,
route_farconflict = 3
};
static enum routability could_route(connection_t *c)
{
struct spd_route *esr, *rosr;
connection_t *ero /* who, if anyone, owns our eroute? */
, *ro = route_owner(c, &rosr, &ero, &esr); /* who owns our route? */
/* it makes no sense to route a connection that is ISAKMP-only */
if (!NEVER_NEGOTIATE(c->policy) && !HAS_IPSEC_POLICY(c->policy))
{
loglog(RC_ROUTE, "cannot route an ISAKMP-only connection");
return route_impossible;
}
/* if this is a Road Warrior template, we cannot route.
* Opportunistic template is OK.
*/
if (c->kind == CK_TEMPLATE && !(c->policy & POLICY_OPPO))
{
loglog(RC_ROUTE, "cannot route Road Warrior template");
return route_impossible;
}
/* if we don't know nexthop, we cannot route */
if (isanyaddr(&c->spd.this.host_nexthop))
{
loglog(RC_ROUTE, "cannot route connection without knowing our nexthop");
return route_impossible;
}
/* if routing would affect IKE messages, reject */
if (c->spd.this.host_port != NAT_T_IKE_FLOAT_PORT
&& c->spd.this.host_port != IKE_UDP_PORT
&& addrinsubnet(&c->spd.that.host_addr, &c->spd.that.client))
{
loglog(RC_LOG_SERIOUS, "cannot install route: peer is within its client");
return route_impossible;
}
/* If there is already a route for peer's client subnet
* and it disagrees about interface or nexthop, we cannot steal it.
* Note: if this connection is already routed (perhaps for another
* state object), the route will agree.
* This is as it should be -- it will arise during rekeying.
*/
if (ro != NULL && !routes_agree(ro, c))
{
loglog(RC_LOG_SERIOUS, "cannot route -- route already in use for \"%s\""
, ro->name);
return route_impossible; /* another connection already
using the eroute */
}
/* if there is an eroute for another connection, there is a problem */
if (ero != NULL && ero != c)
{
connection_t *ero2, *ero_top;
connection_t *inside, *outside;
/*
* note, wavesec (PERMANENT) goes *outside* and
* OE goes *inside* (TEMPLATE)
*/
inside = NULL;
outside= NULL;
if (ero->kind == CK_PERMANENT
&& c->kind == CK_TEMPLATE)
{
outside = ero;
inside = c;
}
else if (c->kind == CK_PERMANENT
&& ero->kind == CK_TEMPLATE)
{
outside = c;
inside = ero;
}
/* okay, check again, with correct order */
if (outside && outside->kind == CK_PERMANENT
&& inside && inside->kind == CK_TEMPLATE)
{
char inst[CONN_INST_BUF];
/* this is a co-terminal attempt of the "near" kind. */
/* when chaining, we chain from inside to outside */
/* XXX permit multiple deep connections? */
passert(inside->policy_next == NULL);
inside->policy_next = outside;
/* since we are going to steal the eroute from the secondary
* policy, we need to make sure that it no longer thinks that
* it owns the eroute.
*/
outside->spd.eroute_owner = SOS_NOBODY;
outside->spd.routing = RT_UNROUTED_KEYED;
/* set the priority of the new eroute owner to be higher
* than that of the current eroute owner
*/
inside->prio = outside->prio + 1;
fmt_conn_instance(inside, inst);
loglog(RC_LOG_SERIOUS
, "conflict on eroute (%s), switching eroute to %s and linking %s"
, inst, inside->name, outside->name);
return route_nearconflict;
}
/* look along the chain of policies for one with the same name */
ero_top = ero;
for (ero2 = ero; ero2 != NULL; ero2 = ero->policy_next)
{
if (ero2->kind == CK_TEMPLATE
&& streq(ero2->name, c->name))
break;
}
/* If we fell of the end of the list, then we found no TEMPLATE
* so there must be a conflict that we can't resolve.
* As the names are not equal, then we aren't replacing/rekeying.
*/
if (ero2 == NULL)
{
char inst[CONN_INST_BUF];
fmt_conn_instance(ero, inst);
loglog(RC_LOG_SERIOUS
, "cannot install eroute -- it is in use for \"%s\"%s #%lu"
, ero->name, inst, esr->eroute_owner);
return route_impossible;
}
}
return route_easy;
}
bool trap_connection(connection_t *c)
{
switch (could_route(c))
{
case route_impossible:
return FALSE;
case route_nearconflict:
case route_easy:
/* RT_ROUTED_TUNNEL is treated specially: we don't override
* because we don't want to lose track of the IPSEC_SAs etc.
*/
if (c->spd.routing < RT_ROUTED_TUNNEL)
{
return route_and_eroute(c, &c->spd, NULL);
}
return TRUE;
case route_farconflict:
return FALSE;
}
return FALSE;
}
/**
* Delete any eroute for a connection and unroute it if route isn't shared
*/
void unroute_connection(connection_t *c)
{
struct spd_route *sr;
enum routing_t cr;
for (sr = &c->spd; sr; sr = sr->next)
{
cr = sr->routing;
if (erouted(cr))
{
/* cannot handle a live one */
passert(sr->routing != RT_ROUTED_TUNNEL);
shunt_eroute(c, sr, RT_UNROUTED, ERO_DELETE, "delete");
}
sr->routing = RT_UNROUTED; /* do now so route_owner won't find us */
/* only unroute if no other connection shares it */
if (routed(cr) && route_owner(c, NULL, NULL, NULL) == NULL)
{
(void) do_command(c, sr, NULL, "unroute");
}
}
}
static void set_text_said(char *text_said, const ip_address *dst,
ipsec_spi_t spi, int proto)
{
ip_said said;
initsaid(dst, spi, proto, &said);
satot(&said, 0, text_said, SATOT_BUF);
}
/**
* Setup an IPsec route entry.
* op is one of the ERO_* operators.
*/
static bool raw_eroute(const ip_address *this_host,
const ip_subnet *this_client,
const ip_address *that_host,
const ip_subnet *that_client,
mark_t mark,
ipsec_spi_t spi,
unsigned int proto,
unsigned int satype,
unsigned int transport_proto,
ipsec_sa_cfg_t *sa,
unsigned int op,
const char *opname USED_BY_DEBUG)
{
traffic_selector_t *ts_src, *ts_dst;
host_t *host_src, *host_dst;
policy_type_t type = POLICY_IPSEC;
policy_dir_t dir = POLICY_OUT;
char text_said[SATOT_BUF];
bool ok = TRUE, routed = FALSE,
deleting = (op & ERO_MASK) == ERO_DELETE,
replacing = op & (SADB_X_SAFLAGS_REPLACEFLOW << ERO_FLAG_SHIFT);
set_text_said(text_said, that_host, spi, proto);
DBG(DBG_CONTROL | DBG_KERNEL,
{
int sport = ntohs(portof(&this_client->addr));
int dport = ntohs(portof(&that_client->addr));
char mybuf[SUBNETTOT_BUF];
char peerbuf[SUBNETTOT_BUF];
subnettot(this_client, 0, mybuf, sizeof(mybuf));
subnettot(that_client, 0, peerbuf, sizeof(peerbuf));
DBG_log("%s eroute %s:%d -> %s:%d => %s:%d"
, opname, mybuf, sport, peerbuf, dport
, text_said, transport_proto);
});
if (satype == SADB_X_SATYPE_INT)
{
switch (ntohl(spi))
{
case SPI_PASS:
type = POLICY_PASS;
break;
case SPI_DROP:
case SPI_REJECT:
type = POLICY_DROP;
break;
case SPI_TRAP:
case SPI_TRAPSUBNET:
case SPI_HOLD:
if (op & (SADB_X_SAFLAGS_INFLOW << ERO_FLAG_SHIFT))
{
return TRUE;
}
routed = TRUE;
break;
}
}
if (op & (SADB_X_SAFLAGS_INFLOW << ERO_FLAG_SHIFT))
{
dir = POLICY_IN;
}
host_src = host_create_from_sockaddr((sockaddr_t*)this_host);
host_dst = host_create_from_sockaddr((sockaddr_t*)that_host);
ts_src = traffic_selector_from_subnet(this_client, transport_proto);
ts_dst = traffic_selector_from_subnet(that_client, transport_proto);
if (deleting || replacing)
{
hydra->kernel_interface->del_policy(hydra->kernel_interface,
ts_src, ts_dst, dir, sa->reqid, mark, routed);
}
if (!deleting)
{
ok = hydra->kernel_interface->add_policy(hydra->kernel_interface,
host_src, host_dst, ts_src, ts_dst, dir, type, sa,
mark, routed) == SUCCESS;
}
if (dir == POLICY_IN)
{ /* handle forward policy */
dir = POLICY_FWD;
if (deleting || replacing)
{
hydra->kernel_interface->del_policy(hydra->kernel_interface,
ts_src, ts_dst, dir, sa->reqid, mark, routed);
}
if (!deleting && ok &&
(sa->mode == MODE_TUNNEL || satype == SADB_X_SATYPE_INT))
{
ok = hydra->kernel_interface->add_policy(hydra->kernel_interface,
host_src, host_dst, ts_src, ts_dst, dir, type, sa,
mark, routed) == SUCCESS;
}
}
host_src->destroy(host_src);
host_dst->destroy(host_dst);
ts_src->destroy(ts_src);
ts_dst->destroy(ts_dst);
return ok;
}
static bool eroute_connection(struct spd_route *sr, ipsec_spi_t spi,
unsigned int proto, unsigned int satype,
ipsec_sa_cfg_t *sa, unsigned int op,
const char *opname)
{
const ip_address *peer = &sr->that.host_addr;
char buf2[256];
bool ok;
snprintf(buf2, sizeof(buf2)
, "eroute_connection %s", opname);
if (proto == SA_INT)
{
peer = aftoinfo(addrtypeof(peer))->any;
}
ok = raw_eroute(peer, &sr->that.client,
&sr->this.host_addr, &sr->this.client, sr->mark_in,
spi, proto, satype, sr->this.protocol,
sa, op | (SADB_X_SAFLAGS_INFLOW << ERO_FLAG_SHIFT), buf2);
return raw_eroute(&sr->this.host_addr, &sr->this.client, peer,
&sr->that.client, sr->mark_out, spi, proto, satype,
sr->this.protocol, sa, op, buf2) && ok;
}
/* assign a bare hold to a connection */
bool assign_hold(connection_t *c USED_BY_DEBUG, struct spd_route *sr,
int transport_proto,
const ip_address *src,
const ip_address *dst)
{
/* either the automatically installed %hold eroute is broad enough
* or we try to add a broader one and delete the automatic one.
* Beware: this %hold might be already handled, but still squeak
* through because of a race.
*/
enum routing_t ro = sr->routing /* routing, old */
, rn = ro; /* routing, new */
passert(LHAS(LELEM(CK_PERMANENT) | LELEM(CK_INSTANCE), c->kind));
/* figure out what routing should become */
switch (ro)
{
case RT_UNROUTED:
rn = RT_UNROUTED_HOLD;
break;
case RT_ROUTED_PROSPECTIVE:
rn = RT_ROUTED_HOLD;
break;
default:
/* no change: this %hold is old news and should just be deleted */
break;
}
/* We need a broad %hold
* First we ensure that there is a broad %hold.
* There may already be one (race condition): no need to create one.
* There may already be a %trap: replace it.
* There may not be any broad eroute: add %hold.
*/
if (rn != ro)
{
if (erouted(ro)
? !eroute_connection(sr, htonl(SPI_HOLD), SA_INT, SADB_X_SATYPE_INT,
&null_ipsec_sa, ERO_REPLACE,
"replace %trap with broad %hold")
: !eroute_connection(sr, htonl(SPI_HOLD), SA_INT, SADB_X_SATYPE_INT,
&null_ipsec_sa, ERO_ADD, "add broad %hold"))
{
return FALSE;
}
}
sr->routing = rn;
return TRUE;
}
/* install or remove eroute for SA Group */
static bool sag_eroute(struct state *st, struct spd_route *sr,
unsigned op, const char *opname)
{
u_int inner_proto, inner_satype;
ipsec_spi_t inner_spi = 0;
ipsec_sa_cfg_t sa = {
.mode = MODE_TRANSPORT,
};
bool tunnel = FALSE;
if (st->st_ah.present)
{
inner_spi = st->st_ah.attrs.spi;
inner_proto = SA_AH;
inner_satype = SADB_SATYPE_AH;
sa.ah.use = TRUE;
sa.ah.spi = inner_spi;
tunnel |= st->st_ah.attrs.encapsulation == ENCAPSULATION_MODE_TUNNEL;
}
if (st->st_esp.present)
{
inner_spi = st->st_esp.attrs.spi;
inner_proto = SA_ESP;
inner_satype = SADB_SATYPE_ESP;
sa.esp.use = TRUE;
sa.esp.spi = inner_spi;
tunnel |= st->st_esp.attrs.encapsulation == ENCAPSULATION_MODE_TUNNEL;
}
if (st->st_ipcomp.present)
{
inner_spi = st->st_ipcomp.attrs.spi;
inner_proto = SA_COMP;
inner_satype = SADB_X_SATYPE_COMP;
sa.ipcomp.transform = st->st_ipcomp.attrs.transid;
sa.ipcomp.cpi = htons(ntohl(inner_spi));
tunnel |= st->st_ipcomp.attrs.encapsulation == ENCAPSULATION_MODE_TUNNEL;
}
if (!sa.ah.use && !sa.esp.use && !sa.ipcomp.transform)
{
impossible(); /* no transform at all! */
}
if (tunnel)
{
inner_spi = st->st_tunnel_out_spi;
inner_proto = SA_IPIP;
inner_satype = SADB_X_SATYPE_IPIP;
sa.mode = MODE_TUNNEL;
}
sa.reqid = sr->reqid;
return eroute_connection(sr, inner_spi, inner_proto, inner_satype,
&sa, op, opname);
}
/* compute a (host-order!) SPI to implement the policy in connection c */
ipsec_spi_t
shunt_policy_spi(connection_t *c, bool prospective)
{
/* note: these are in host order :-( */
static const ipsec_spi_t shunt_spi[] =
{
SPI_TRAP, /* --initiateontraffic */
SPI_PASS, /* --pass */
SPI_DROP, /* --drop */
SPI_REJECT, /* --reject */
};
static const ipsec_spi_t fail_spi[] =
{
0, /* --none*/
SPI_PASS, /* --failpass */
SPI_DROP, /* --faildrop */
SPI_REJECT, /* --failreject */
};
return prospective
? shunt_spi[(c->policy & POLICY_SHUNT_MASK) >> POLICY_SHUNT_SHIFT]
: fail_spi[(c->policy & POLICY_FAIL_MASK) >> POLICY_FAIL_SHIFT];
}
/* Add/replace/delete a shunt eroute.
* Such an eroute determines the fate of packets without the use
* of any SAs. These are defaults, in effect.
* If a negotiation has not been attempted, use %trap.
* If negotiation has failed, the choice between %trap/%pass/%drop/%reject
* is specified in the policy of connection c.
*/
static bool shunt_eroute(connection_t *c, struct spd_route *sr,
enum routing_t rt_kind,
unsigned int op, const char *opname)
{
/* We are constructing a special SAID for the eroute.
* The destination doesn't seem to matter, but the family does.
* The protocol is SA_INT -- mark this as shunt.
* The satype has no meaning, but is required for PF_KEY header!
* The SPI signifies the kind of shunt.
*/
ipsec_spi_t spi = shunt_policy_spi(c, rt_kind == RT_ROUTED_PROSPECTIVE);
if (spi == 0)
{
/* we're supposed to end up with no eroute: rejig op and opname */
switch (op)
{
case ERO_REPLACE:
/* replace with nothing == delete */
op = ERO_DELETE;
opname = "delete";
break;
case ERO_ADD:
/* add nothing == do nothing */
return TRUE;
case ERO_DELETE:
/* delete remains delete */
break;
default:
bad_case(op);
}
}
if (sr->routing == RT_ROUTED_ECLIPSED && c->kind == CK_TEMPLATE)
{
/* We think that we have an eroute, but we don't.
* Adjust the request and account for eclipses.
*/
passert(eclipsable(sr));
switch (op)
{
case ERO_REPLACE:
/* really an add */
op = ERO_ADD;
opname = "replace eclipsed";
eclipse_count--;
break;
case ERO_DELETE:
/* delete unnecessary: we don't actually have an eroute */
eclipse_count--;
return TRUE;
case ERO_ADD:
default:
bad_case(op);
}
}
else if (eclipse_count > 0 && op == ERO_DELETE && eclipsable(sr))
{
/* maybe we are uneclipsing something */
struct spd_route *esr;
connection_t *ue = eclipsed(c, &esr);
if (ue != NULL)
{
esr->routing = RT_ROUTED_PROSPECTIVE;
return shunt_eroute(ue, esr
, RT_ROUTED_PROSPECTIVE, ERO_REPLACE, "restoring eclipsed");
}
}
return eroute_connection(sr, htonl(spi), SA_INT, SADB_X_SATYPE_INT,
&null_ipsec_sa, op, opname);
}
static bool setup_half_ipsec_sa(struct state *st, bool inbound)
{
host_t *host_src, *host_dst;
connection_t *c = st->st_connection;
struct end *src, *dst;
ipsec_mode_t mode = MODE_TRANSPORT;
ipsec_sa_cfg_t sa = { .mode = 0 };
lifetime_cfg_t lt_none = { .time = { .rekey = 0 } };
mark_t mark;
bool ok = TRUE;
/* SPIs, saved for undoing, if necessary */
struct kernel_sa said[EM_MAXRELSPIS], *said_next = said;
if (inbound)
{
src = &c->spd.that;
dst = &c->spd.this;
mark = c->spd.mark_in;
}
else
{
src = &c->spd.this;
dst = &c->spd.that;
mark = c->spd.mark_out;
}
host_src = host_create_from_sockaddr((sockaddr_t*)&src->host_addr);
host_dst = host_create_from_sockaddr((sockaddr_t*)&dst->host_addr);
if (st->st_ah.attrs.encapsulation == ENCAPSULATION_MODE_TUNNEL
|| st->st_esp.attrs.encapsulation == ENCAPSULATION_MODE_TUNNEL
|| st->st_ipcomp.attrs.encapsulation == ENCAPSULATION_MODE_TUNNEL)
{
mode = MODE_TUNNEL;
}
sa.mode = mode;
sa.reqid = c->spd.reqid;
memset(said, 0, sizeof(said));
/* set up IPCOMP SA, if any */
if (st->st_ipcomp.present)
{
ipsec_spi_t ipcomp_spi = inbound ? st->st_ipcomp.our_spi
: st->st_ipcomp.attrs.spi;
switch (st->st_ipcomp.attrs.transid)
{
case IPCOMP_DEFLATE:
break;
default:
loglog(RC_LOG_SERIOUS, "IPCOMP transform %s not implemented",
enum_name(&ipcomp_transformid_names,
st->st_ipcomp.attrs.transid));
goto fail;
}
sa.ipcomp.cpi = htons(ntohl(ipcomp_spi));
sa.ipcomp.transform = st->st_ipcomp.attrs.transid;
said_next->spi = ipcomp_spi;
said_next->proto = IPPROTO_COMP;
if (hydra->kernel_interface->add_sa(hydra->kernel_interface, host_src,
host_dst, ipcomp_spi, said_next->proto, c->spd.reqid,
mark, 0, &lt_none, ENCR_UNDEFINED, chunk_empty,
AUTH_UNDEFINED, chunk_empty, mode,
st->st_ipcomp.attrs.transid, 0 /* cpi */, FALSE, FALSE,
inbound, NULL, NULL) != SUCCESS)
{
goto fail;
}
said_next++;
mode = MODE_TRANSPORT;
}
/* set up ESP SA, if any */
if (st->st_esp.present)
{
ipsec_spi_t esp_spi = inbound ? st->st_esp.our_spi
: st->st_esp.attrs.spi;
u_char *esp_dst_keymat = inbound ? st->st_esp.our_keymat
: st->st_esp.peer_keymat;
bool encap = st->nat_traversal & NAT_T_DETECTED;
encryption_algorithm_t enc_alg;
integrity_algorithm_t auth_alg;
const struct esp_info *ei;
chunk_t enc_key, auth_key;
u_int16_t key_len;
if ((ei = kernel_alg_esp_info(st->st_esp.attrs.transid,
st->st_esp.attrs.auth)) == NULL)
{
loglog(RC_LOG_SERIOUS, "ESP transform %s / auth %s"
" not implemented yet",
enum_name(&esp_transform_names, st->st_esp.attrs.transid),
enum_name(&auth_alg_names, st->st_esp.attrs.auth));
goto fail;
}
key_len = st->st_esp.attrs.key_len / 8;
if (key_len)
{
/* XXX: must change to check valid _range_ key_len */
if (key_len > ei->enckeylen)
{
loglog(RC_LOG_SERIOUS, "ESP transform %s: key_len=%d > %d",
enum_name(&esp_transform_names, st->st_esp.attrs.transid),
(int)key_len, (int)ei->enckeylen);
goto fail;
}
}
else
{
key_len = ei->enckeylen;
}
switch (ei->transid)
{
case ESP_3DES:
/* 168 bits in kernel, need 192 bits for keymat_len */
if (key_len == 21)
{
key_len = 24;
}
break;
case ESP_DES:
/* 56 bits in kernel, need 64 bits for keymat_len */
if (key_len == 7)
{
key_len = 8;
}
break;
case ESP_AES_CCM_8:
case ESP_AES_CCM_12:
case ESP_AES_CCM_16:
key_len += 3;
break;
case ESP_AES_GCM_8:
case ESP_AES_GCM_12:
case ESP_AES_GCM_16:
case ESP_AES_CTR:
case ESP_AES_GMAC:
key_len += 4;
break;
default:
break;
}
if (encap)
{
host_src->set_port(host_src, src->host_port);
host_dst->set_port(host_dst, dst->host_port);
// st->nat_oa is currently unused
}
/* divide up keying material */
enc_alg = encryption_algorithm_from_esp(st->st_esp.attrs.transid);
enc_key.ptr = esp_dst_keymat;
enc_key.len = key_len;
auth_alg = integrity_algorithm_from_esp(st->st_esp.attrs.auth);
auth_alg = auth_alg ? : AUTH_UNDEFINED;
auth_key.ptr = esp_dst_keymat + key_len;
auth_key.len = ei->authkeylen;
sa.esp.use = TRUE;
sa.esp.spi = esp_spi;
said_next->spi = esp_spi;
said_next->proto = IPPROTO_ESP;
if (hydra->kernel_interface->add_sa(hydra->kernel_interface, host_src,
host_dst, esp_spi, said_next->proto, c->spd.reqid,
mark, 0, &lt_none, enc_alg, enc_key,
auth_alg, auth_key, mode, IPCOMP_NONE, 0 /* cpi */,
encap, FALSE, inbound, NULL, NULL) != SUCCESS)
{
goto fail;
}
said_next++;
mode = MODE_TRANSPORT;
}
/* set up AH SA, if any */
if (st->st_ah.present)
{
ipsec_spi_t ah_spi = inbound ? st->st_ah.our_spi
: st->st_ah.attrs.spi;
u_char *ah_dst_keymat = inbound ? st->st_ah.our_keymat
: st->st_ah.peer_keymat;
integrity_algorithm_t auth_alg;
chunk_t auth_key;
auth_alg = integrity_algorithm_from_esp(st->st_ah.attrs.auth);
auth_key.ptr = ah_dst_keymat;
auth_key.len = st->st_ah.keymat_len;
sa.ah.use = TRUE;
sa.ah.spi = ah_spi;
said_next->spi = ah_spi;
said_next->proto = IPPROTO_AH;
if (hydra->kernel_interface->add_sa(hydra->kernel_interface, host_src,
host_dst, ah_spi, said_next->proto, c->spd.reqid,
mark, 0, &lt_none, ENCR_UNDEFINED, chunk_empty,
auth_alg, auth_key, mode, IPCOMP_NONE, 0 /* cpi */,
FALSE, FALSE, inbound, NULL, NULL) != SUCCESS)
{
goto fail;
}
said_next++;
mode = MODE_TRANSPORT;
}
goto cleanup;
fail:
/* undo the done SPIs */
while (said_next-- != said)
{
hydra->kernel_interface->del_sa(hydra->kernel_interface, host_src,
host_dst, said_next->spi,
said_next->proto, 0 /* cpi */,
mark);
}
ok = FALSE;
cleanup:
host_src->destroy(host_src);
host_dst->destroy(host_dst);
return ok;
}
static bool teardown_half_ipsec_sa(struct state *st, bool inbound)
{
connection_t *c = st->st_connection;
const struct end *src, *dst;
host_t *host_src, *host_dst;
ipsec_spi_t spi;
mark_t mark;
bool result = TRUE;
if (inbound)
{
src = &c->spd.that;
dst = &c->spd.this;
mark = c->spd.mark_in;
}
else
{
src = &c->spd.this;
dst = &c->spd.that;
mark = c->spd.mark_out;
}
host_src = host_create_from_sockaddr((sockaddr_t*)&src->host_addr);
host_dst = host_create_from_sockaddr((sockaddr_t*)&dst->host_addr);
if (st->st_ah.present)
{
spi = inbound ? st->st_ah.our_spi : st->st_ah.attrs.spi;
result &= hydra->kernel_interface->del_sa(hydra->kernel_interface,
host_src, host_dst, spi, IPPROTO_AH,
0 /* cpi */, mark) == SUCCESS;
}
if (st->st_esp.present)
{
spi = inbound ? st->st_esp.our_spi : st->st_esp.attrs.spi;
result &= hydra->kernel_interface->del_sa(hydra->kernel_interface,
host_src, host_dst, spi, IPPROTO_ESP,
0 /* cpi */, mark) == SUCCESS;
}
if (st->st_ipcomp.present)
{
spi = inbound ? st->st_ipcomp.our_spi : st->st_ipcomp.attrs.spi;
result &= hydra->kernel_interface->del_sa(hydra->kernel_interface,
host_src, host_dst, spi, IPPROTO_COMP,
0 /* cpi */, mark) == SUCCESS;
}
host_src->destroy(host_src);
host_dst->destroy(host_dst);
return result;
}
/*
* get information about a given sa
*/
bool get_sa_info(struct state *st, bool inbound, u_int *bytes, time_t *use_time)
{
connection_t *c = st->st_connection;
traffic_selector_t *ts_src = NULL, *ts_dst = NULL;
host_t *host_src = NULL, *host_dst = NULL;
const struct end *src, *dst;
ipsec_spi_t spi;
mark_t mark;
u_int64_t bytes_kernel = 0;
bool result = FALSE;
*use_time = UNDEFINED_TIME;
if (!st->st_esp.present)
{
goto failed;
}
if (inbound)
{
src = &c->spd.that;
dst = &c->spd.this;
mark = c->spd.mark_in;
spi = st->st_esp.our_spi;
}
else
{
src = &c->spd.this;
dst = &c->spd.that;
mark = c->spd.mark_out;
spi = st->st_esp.attrs.spi;
}
host_src = host_create_from_sockaddr((sockaddr_t*)&src->host_addr);
host_dst = host_create_from_sockaddr((sockaddr_t*)&dst->host_addr);
switch(hydra->kernel_interface->query_sa(hydra->kernel_interface, host_src,
host_dst, spi, IPPROTO_ESP,
mark, &bytes_kernel))
{
case FAILED:
goto failed;
case SUCCESS:
*bytes = bytes_kernel;
break;
case NOT_SUPPORTED:
default:
break;
}
if (st->st_serialno == c->spd.eroute_owner)
{
u_int32_t time_kernel;
ts_src = traffic_selector_from_subnet(&src->client, src->protocol);
ts_dst = traffic_selector_from_subnet(&dst->client, dst->protocol);
if (hydra->kernel_interface->query_policy(hydra->kernel_interface,
ts_src, ts_dst, inbound ? POLICY_IN : POLICY_OUT,
mark, &time_kernel) != SUCCESS)
{
goto failed;
}
*use_time = time_kernel;
if (inbound &&
st->st_esp.attrs.encapsulation == ENCAPSULATION_MODE_TUNNEL)
{
if (hydra->kernel_interface->query_policy(hydra->kernel_interface,
ts_src, ts_dst, POLICY_FWD, mark,
&time_kernel) != SUCCESS)
{
goto failed;
}
*use_time = max(*use_time, time_kernel);
}
}
result = TRUE;
failed:
DESTROY_IF(host_src);
DESTROY_IF(host_dst);
DESTROY_IF(ts_src);
DESTROY_IF(ts_dst);
return result;
}
/**
* Handler for kernel events (called by thread-pool thread)
*/
kernel_listener_t *kernel_handler;
/**
* Data for acquire events
*/
typedef struct {
/** Subnets */
ip_subnet src, dst;
/** Transport protocol */
int proto;
} acquire_data_t;
/**
* Callback for acquire events (called by main thread)
*/
void handle_acquire(acquire_data_t *this)
{
record_and_initiate_opportunistic(&this->src, &this->dst, this->proto,
"%acquire");
}
METHOD(kernel_listener_t, acquire, bool,
kernel_listener_t *this, u_int32_t reqid,
traffic_selector_t *src_ts, traffic_selector_t *dst_ts)
{
if (src_ts && dst_ts)
{
acquire_data_t *data;
DBG(DBG_CONTROL,
DBG_log("creating acquire event for policy %R === %R "
"with reqid {%u}", src_ts, dst_ts, reqid));
INIT(data,
.src = subnet_from_traffic_selector(src_ts),
.dst = subnet_from_traffic_selector(dst_ts),
.proto = src_ts->get_protocol(src_ts),
);
pluto->events->queue(pluto->events, (void*)handle_acquire, data, free);
}
else
{
DBG(DBG_CONTROL,
DBG_log("ignoring acquire without traffic selectors for policy "
"with reqid {%u}", reqid));
}
DESTROY_IF(src_ts);
DESTROY_IF(dst_ts);
return TRUE;
}
/**
* Data for mapping events
*/
typedef struct {
/** reqid, spi of affected SA */
u_int32_t reqid, spi;
/** new endpont */
ip_address new_end;
} mapping_data_t;
/**
* Callback for mapping events (called by main thread)
*/
void handle_mapping(mapping_data_t *this)
{
process_nat_t_new_mapping(this->reqid, this->spi, &this->new_end);
}
METHOD(kernel_listener_t, mapping, bool,
kernel_listener_t *this, u_int32_t reqid, u_int32_t spi, host_t *remote)
{
mapping_data_t *data;
DBG(DBG_CONTROL,
DBG_log("creating mapping event for SA with SPI %.8x and reqid {%u}",
spi, reqid));
INIT(data,
.reqid = reqid,
.spi = spi,
.new_end = *(ip_address*)remote->get_sockaddr(remote),
);
pluto->events->queue(pluto->events, (void*)handle_mapping, data, free);
return TRUE;
}
void init_kernel(void)
{
/* register SA types that we can negotiate */
can_do_IPcomp = FALSE; /* until we get a response from the kernel */
pfkey_register();
INIT(kernel_handler,
.acquire = _acquire,
.mapping = _mapping,
);
hydra->kernel_interface->add_listener(hydra->kernel_interface,
kernel_handler);
}
void kernel_finalize()
{
hydra->kernel_interface->remove_listener(hydra->kernel_interface,
kernel_handler);
free(kernel_handler);
}
/* Note: install_inbound_ipsec_sa is only used by the Responder.
* The Responder will subsequently use install_ipsec_sa for the outbound.
* The Initiator uses install_ipsec_sa to install both at once.
*/
bool install_inbound_ipsec_sa(struct state *st)
{
connection_t *const c = st->st_connection;
/* If our peer has a fixed-address client, check if we already
* have a route for that client that conflicts. We will take this
* as proof that that route and the connections using it are
* obsolete and should be eliminated. Interestingly, this is
* the only case in which we can tell that a connection is obsolete.
*/
passert(c->kind == CK_PERMANENT || c->kind == CK_INSTANCE);
if (c->spd.that.has_client)
{
for (;;)
{
struct spd_route *esr;
connection_t *o = route_owner(c, &esr, NULL, NULL);
if (o == NULL)
{
break; /* nobody has a route */
}
/* note: we ignore the client addresses at this end */
if (sameaddr(&o->spd.that.host_addr, &c->spd.that.host_addr) &&
o->interface == c->interface)
{
break; /* existing route is compatible */
}
if (o->kind == CK_TEMPLATE && streq(o->name, c->name))
{
break; /* ??? is this good enough?? */
}
loglog(RC_LOG_SERIOUS, "route to peer's client conflicts with \"%s\" %s; releasing old connection to free the route"
, o->name, ip_str(&o->spd.that.host_addr));
release_connection(o, FALSE);
}
}
DBG(DBG_CONTROL, DBG_log("install_inbound_ipsec_sa() checking if we can route"));
/* check that we will be able to route and eroute */
switch (could_route(c))
{
case route_easy:
case route_nearconflict:
break;
default:
return FALSE;
}
/* (attempt to) actually set up the SAs */
return setup_half_ipsec_sa(st, TRUE);
}
/* Install a route and then a prospective shunt eroute or an SA group eroute.
* Assumption: could_route gave a go-ahead.
* Any SA Group must have already been created.
* On failure, steps will be unwound.
*/
bool route_and_eroute(connection_t *c, struct spd_route *sr, struct state *st)
{
struct spd_route *esr;
struct spd_route *rosr;
connection_t *ero /* who, if anyone, owns our eroute? */
, *ro = route_owner(c, &rosr, &ero, &esr);
bool eroute_installed = FALSE
, firewall_notified = FALSE
, route_installed = FALSE;
connection_t *ero_top;
DBG(DBG_CONTROLMORE,
DBG_log("route_and_eroute with c: %s (next: %s) ero:%s esr:{%p} ro:%s rosr:{%p} and state: %lu"
, c->name
, (c->policy_next ? c->policy_next->name : "none")
, ero ? ero->name : "null"
, esr
, ro ? ro->name : "null"
, rosr
, st ? st->st_serialno : 0));
/* look along the chain of policies for one with the same name */
ero_top = ero;
#if 0
/* XXX - mcr this made sense before, and likely will make sense
* again, so I'l leaving this to remind me what is up */
if (ero!= NULL && ero->routing == RT_UNROUTED_KEYED)
ero = NULL;
for (ero2 = ero; ero2 != NULL; ero2 = ero->policy_next)
if ((ero2->kind == CK_TEMPLATE || ero2->kind==CK_SECONDARY)
&& streq(ero2->name, c->name))
break;
#endif
/* install the eroute */
if (ero != NULL)
{
/* We're replacing an eroute */
/* if no state provided, then install a shunt for later */
if (st == NULL)
{
eroute_installed = shunt_eroute(c, sr, RT_ROUTED_PROSPECTIVE
, ERO_REPLACE, "replace");
}
else
{
eroute_installed = sag_eroute(st, sr, ERO_REPLACE, "replace");
}
#if 0
/* XXX - MCR. I previously felt that this was a bogus check */
if (ero != NULL && ero != c && esr != sr)
{
/* By elimination, we must be eclipsing ero. Check. */
passert(ero->kind == CK_TEMPLATE && streq(ero->name, c->name));
passert(LHAS(LELEM(RT_ROUTED_PROSPECTIVE) | LELEM(RT_ROUTED_ECLIPSED)
, esr->routing));
passert(samesubnet(&esr->this.client, &sr->this.client)
&& samesubnet(&esr->that.client, &sr->that.client));
}
#endif
}
else
{
/* we're adding an eroute */
/* if no state provided, then install a shunt for later */
if (st == NULL)
{
eroute_installed = shunt_eroute(c, sr, RT_ROUTED_PROSPECTIVE
, ERO_ADD, "add");
}
else
{
eroute_installed = sag_eroute(st, sr, ERO_ADD, "add");
}
}
/* notify the firewall of a new tunnel */
if (eroute_installed)
{
/* do we have to notify the firewall? Yes, if we are installing
* a tunnel eroute and the firewall wasn't notified
* for a previous tunnel with the same clients. Any Previous
* tunnel would have to be for our connection, so the actual
* test is simple.
*/
firewall_notified = st == NULL /* not a tunnel eroute */
|| sr->eroute_owner != SOS_NOBODY /* already notified */
|| do_command(c, sr, st, "up"); /* go ahead and notify */
}
/* install the route */
DBG(DBG_CONTROL,
DBG_log("route_and_eroute: firewall_notified: %s"
, firewall_notified ? "true" : "false"));
if (!firewall_notified)
{
/* we're in trouble -- don't do routing */
}
else if (ro == NULL)
{
/* a new route: no deletion required, but preparation is */
(void) do_command(c, sr, st, "prepare"); /* just in case; ignore failure */
route_installed = do_command(c, sr, st, "route");
}
else if (routed(sr->routing) || routes_agree(ro, c))
{
route_installed = TRUE; /* nothing to be done */
}
else
{
/* Some other connection must own the route
* and the route must disagree. But since could_route
* must have allowed our stealing it, we'll do so.
*
* A feature of LINUX allows us to install the new route
* before deleting the old if the nexthops differ.
* This reduces the "window of vulnerability" when packets
* might flow in the clear.
*/
if (sameaddr(&sr->this.host_nexthop, &esr->this.host_nexthop))
{
(void) do_command(ro, sr, st, "unroute");
route_installed = do_command(c, sr, st, "route");
}
else
{
route_installed = do_command(c, sr, st, "route");
(void) do_command(ro, sr, st, "unroute");
}
/* record unrouting */
if (route_installed)
{
do {
passert(!erouted(rosr->routing));
rosr->routing = RT_UNROUTED;
/* no need to keep old value */
ro = route_owner(c, &rosr, NULL, NULL);
} while (ro != NULL);
}
}
/* all done -- clean up */
if (route_installed)
{
/* Success! */
if (ero != NULL && ero != c)
{
/* check if ero is an ancestor of c. */
connection_t *ero2;
for (ero2 = c; ero2 != NULL && ero2 != c; ero2 = ero2->policy_next)
;
if (ero2 == NULL)
{
/* By elimination, we must be eclipsing ero. Checked above. */
if (ero->spd.routing != RT_ROUTED_ECLIPSED)
{
ero->spd.routing = RT_ROUTED_ECLIPSED;
eclipse_count++;
}
}
}
if (st == NULL)
{
passert(sr->eroute_owner == SOS_NOBODY);
sr->routing = RT_ROUTED_PROSPECTIVE;
}
else
{
char cib[CONN_INST_BUF];
sr->routing = RT_ROUTED_TUNNEL;
DBG(DBG_CONTROL,
DBG_log("route_and_eroute: instance \"%s\"%s, setting eroute_owner {spd=%p,sr=%p} to #%ld (was #%ld) (newest_ipsec_sa=#%ld)"
, st->st_connection->name
, (fmt_conn_instance(st->st_connection, cib), cib)
, &st->st_connection->spd, sr
, st->st_serialno
, sr->eroute_owner
, st->st_connection->newest_ipsec_sa));
sr->eroute_owner = st->st_serialno;
}
return TRUE;
}
else
{
/* Failure! Unwind our work. */
if (firewall_notified && sr->eroute_owner == SOS_NOBODY)
(void) do_command(c, sr, st, "down");
if (eroute_installed)
{
/* Restore original eroute, if we can.
* Since there is nothing much to be done if the restoration
* fails, ignore success or failure.
*/
if (ero != NULL)
{
/* restore ero's former glory */
if (esr->eroute_owner == SOS_NOBODY)
{
/* note: normal or eclipse case */
(void) shunt_eroute(ero, esr
, esr->routing, ERO_REPLACE, "restore");
}
else
{
/* Try to find state that owned eroute.
* Don't do anything if it cannot be found.
* This case isn't likely since we don't run
* the updown script when replacing a SA group
* with its successor (for the same conn).
*/
struct state *ost = state_with_serialno(esr->eroute_owner);
if (ost != NULL)
(void) sag_eroute(ost, esr, ERO_REPLACE, "restore");
}
}
else
{
/* there was no previous eroute: delete whatever we installed */
if (st == NULL)
{
(void) shunt_eroute(c, sr, sr->routing, ERO_DELETE, "delete");
}
else
{
(void) sag_eroute(st, sr, ERO_DELETE, "delete");
}
}
}
return FALSE;
}
}
bool install_ipsec_sa(struct state *st, bool inbound_also)
{
struct spd_route *sr;
DBG(DBG_CONTROL, DBG_log("install_ipsec_sa() for #%ld: %s"
, st->st_serialno
, inbound_also?
"inbound and outbound" : "outbound only"));
switch (could_route(st->st_connection))
{
case route_easy:
case route_nearconflict:
break;
default:
return FALSE;
}
/* (attempt to) actually set up the SA group */
if ((inbound_also && !setup_half_ipsec_sa(st, TRUE)) ||
!setup_half_ipsec_sa(st, FALSE))
{
return FALSE;
}
for (sr = &st->st_connection->spd; sr != NULL; sr = sr->next)
{
DBG(DBG_CONTROL, DBG_log("sr for #%ld: %s"
, st->st_serialno
, enum_name(&routing_story, sr->routing)));
/*
* if the eroute owner is not us, then make it us.
* See test co-terminal-02, pluto-rekey-01, pluto-unit-02/oppo-twice
*/
pexpect(sr->eroute_owner == SOS_NOBODY
|| sr->routing >= RT_ROUTED_TUNNEL);
if (sr->eroute_owner != st->st_serialno
&& sr->routing != RT_UNROUTED_KEYED)
{
if (!route_and_eroute(st->st_connection, sr, st))
{
delete_ipsec_sa(st, FALSE);
/* XXX go and unroute any SRs that were successfully
* routed already.
*/
return FALSE;
}
}
}
return TRUE;
}
/* delete an IPSEC SA.
* we may not succeed, but we bull ahead anyway because
* we cannot do anything better by recognizing failure
*/
void delete_ipsec_sa(struct state *st, bool inbound_only)
{
if (!inbound_only)
{
/* If the state is the eroute owner, we must adjust
* the routing for the connection.
*/
connection_t *c = st->st_connection;
struct spd_route *sr;
passert(st->st_connection);
for (sr = &c->spd; sr; sr = sr->next)
{
if (sr->eroute_owner == st->st_serialno
&& sr->routing == RT_ROUTED_TUNNEL)
{
sr->eroute_owner = SOS_NOBODY;
/* Routing should become RT_ROUTED_FAILURE,
* but if POLICY_FAIL_NONE, then we just go
* right back to RT_ROUTED_PROSPECTIVE as if no
* failure happened.
*/
sr->routing = (c->policy & POLICY_FAIL_MASK) == POLICY_FAIL_NONE
? RT_ROUTED_PROSPECTIVE : RT_ROUTED_FAILURE;
(void) do_command(c, sr, st, "down");
if ((c->policy & POLICY_DONT_REKEY) && c->kind == CK_INSTANCE)
{
/* in this special case, even if the connection
* is still alive (due to an ISAKMP SA),
* we get rid of routing.
* Even though there is still an eroute, the c->routing
* setting will convince unroute_connection to delete it.
* unroute_connection would be upset if c->routing == RT_ROUTED_TUNNEL
*/
unroute_connection(c);
}
else
{
(void) shunt_eroute(c, sr, sr->routing, ERO_REPLACE, "replace with shunt");
}
}
}
(void) teardown_half_ipsec_sa(st, FALSE);
}
(void) teardown_half_ipsec_sa(st, TRUE);
}
static bool update_nat_t_ipsec_esp_sa (struct state *st, bool inbound)
{
connection_t *c = st->st_connection;
host_t *host_src, *host_dst, *new_src, *new_dst;
ipsec_spi_t spi = inbound ? st->st_esp.our_spi : st->st_esp.attrs.spi;
struct end *src = inbound ? &c->spd.that : &c->spd.this,
*dst = inbound ? &c->spd.this : &c->spd.that;
mark_t mark = inbound ? c->spd.mark_in : c->spd.mark_out;
bool result;
host_src = host_create_from_sockaddr((sockaddr_t*)&src->host_addr);
host_dst = host_create_from_sockaddr((sockaddr_t*)&dst->host_addr);
new_src = host_src->clone(host_src);
new_dst = host_dst->clone(host_dst);
new_src->set_port(new_src, src->host_port);
new_dst->set_port(new_dst, dst->host_port);
result = hydra->kernel_interface->update_sa(hydra->kernel_interface,
spi, IPPROTO_ESP, 0 /* cpi */, host_src, host_dst,
new_src, new_dst, TRUE /* encap */, TRUE /* new_encap */,
mark) == SUCCESS;
host_src->destroy(host_src);
host_dst->destroy(host_dst);
new_src->destroy(new_src);
new_dst->destroy(new_dst);
return result;
}
bool update_ipsec_sa (struct state *st)
{
if (IS_IPSEC_SA_ESTABLISHED(st->st_state))
{
if (st->st_esp.present && (
(!update_nat_t_ipsec_esp_sa (st, TRUE)) ||
(!update_nat_t_ipsec_esp_sa (st, FALSE))))
{
return FALSE;
}
}
else if (IS_ONLY_INBOUND_IPSEC_SA_ESTABLISHED(st->st_state))
{
if (st->st_esp.present && !update_nat_t_ipsec_esp_sa (st, FALSE))
{
return FALSE;
}
}
else
{
DBG_log("assert failed at %s:%d st_state=%d", __FILE__, __LINE__, st->st_state);
return FALSE;
}
return TRUE;
}
/* Check if there was traffic on given SA during the last idle_max
* seconds. If TRUE, the SA was idle and DPD exchange should be performed.
* If FALSE, DPD is not necessary. We also return TRUE for errors, as they
* could mean that the SA is broken and needs to be replace anyway.
*/
bool was_eroute_idle(struct state *st, time_t idle_max, time_t *idle_time)
{
time_t use_time;
u_int bytes;
int ret = TRUE;
passert(st != NULL);
if (get_sa_info(st, TRUE, &bytes, &use_time) && use_time != UNDEFINED_TIME)
{
*idle_time = time_monotonic(NULL) - use_time;
ret = *idle_time >= idle_max;
}
return ret;
}
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