void pbs_poke(pb_stream *pbs, int offset, int value)
{
if(offset < pbs_room(pbs)) {
pbs->start[offset] = value;
if(pbs->cur < pbs->start + offset) {
pbs->cur = pbs->start + offset;
}
} else {
openswan_log("pbs_peek offset:%d < pbs_room(pbs):%d", offset, pbs_room(pbs));
pexpect(offset < pbs_room(pbs));
}
}
/* process an input packet, possibly generating a reply.
*
* If all goes well, this routine eventually calls a state-specific
* transition function.
*/
void process_packet(struct msg_digest **mdp)
{
struct msg_digest *md = *mdp;
struct state *st = NULL;
int vmaj, vmin;
enum state_kind from_state = STATE_UNDEFINED; /* state we started in */
#define SEND_NOTIFICATION(t) { \
if (st) \
send_notification_from_state(st, from_state, t); \
else \
send_notification_from_md(md, t); }
if (!in_struct(&md->hdr, &isakmp_hdr_desc, &md->packet_pbs,
&md->message_pbs)) {
/*
* The packet was very badly mangled. We can't be sure of any
* content - not even to look for major version number!
* So we'll just silently drop it
*/
libreswan_log("Received packet with mangled IKE header - dropped");
SEND_NOTIFICATION(PAYLOAD_MALFORMED);
return;
}
if (md->packet_pbs.roof < md->message_pbs.roof) {
/* I don't think this can happen if in_struct() did not fail */
libreswan_log(
"received packet size (%u) is smaller than from "
"size specified in ISAKMP HDR (%u) - packet dropped",
(unsigned) pbs_room(&md->packet_pbs),
md->hdr.isa_length);
/* abort processing corrupt packet */
return;
} else if (md->packet_pbs.roof > md->message_pbs.roof) {
/*
* Some (old?) versions of the Cisco VPN client send an additional
* 16 bytes of zero bytes - Complain but accept it
*/
DBG(DBG_CONTROL, {
DBG_log(
"size (%u) in received packet is larger than the size "
"specified in ISAKMP HDR (%u) - ignoring extraneous bytes",
(unsigned) pbs_room(&md->packet_pbs),
md->hdr.isa_length);
DBG_dump("extraneous bytes:", md->message_pbs.roof,
md->packet_pbs.roof - md->message_pbs.roof);
});
/* process an input packet, possibly generating a reply.
*
* If all goes well, this routine eventually calls a state-specific
* transition function.
*/
void process_packet(struct msg_digest **mdp)
{
struct msg_digest *md = *mdp;
int vmaj, vmin;
if (!in_struct(&md->hdr, &isakmp_hdr_desc, &md->packet_pbs,
&md->message_pbs)) {
/* The packet was very badly mangled. We can't be sure of any
* content - not even to look for major version number!
* So we'll just drop it.
*/
libreswan_log("Received packet with mangled IKE header - dropped");
send_notification_from_md(md, PAYLOAD_MALFORMED);
return;
}
if (md->packet_pbs.roof > md->message_pbs.roof) {
/* Some (old?) versions of the Cisco VPN client send an additional
* 16 bytes of zero bytes - Complain but accept it
*/
DBG(DBG_CONTROL, {
DBG_log(
"size (%u) in received packet is larger than the size "
"specified in ISAKMP HDR (%u) - ignoring extraneous bytes",
(unsigned) pbs_room(&md->packet_pbs),
md->hdr.isa_length);
DBG_dump("extraneous bytes:", md->message_pbs.roof,
md->packet_pbs.roof - md->message_pbs.roof);
});
int pbs_peek(pb_stream *pbs, int offset)
{
if(offset < pbs_room(pbs)) {
return pbs->start[offset];
} else {
return 0;
}
}
int pbs_append(pb_stream *dest, int destoffset
, pb_stream *src, int offset, int length)
{
/* -1 means end of destination stream */
if(destoffset == -1) {
destoffset = pbs_offset(dest);
}
if(destoffset > pbs_room(dest) ||
destoffset + length > pbs_room(dest)) {
return 0;
}
if(offset > pbs_room(src) ||
offset + length > pbs_room(src)) {
return 0;
}
memcpy(&dest->start[destoffset], &src->start[offset], length);
if(dest->cur < (dest->start + destoffset + length)) {
dest->cur = dest->start + (destoffset + length);
}
}
/**
* nat_traversal_natoa_lookup()
*
* Look for NAT-OA in message
*/
void nat_traversal_natoa_lookup(struct msg_digest *md)
{
struct payload_digest *p;
struct state *st = md->st;
int i;
ip_address ip;
if (!st || !md->iface) {
loglog(RC_LOG_SERIOUS, "NAT-Traversal: assert failed %s:%d",
__FILE__, __LINE__);
return;
}
/** Count NAT-OA **/
for (p = md->chain[ISAKMP_NEXT_NATOA_R], i=0; p != NULL; p = p->next, i++);
#if 0
DBG_log("NAT-Traversal: received %d NAT-OA.", i);
#endif
if (i==0) {
return;
}
else if (!(st->nat_traversal & LELEM(NAT_TRAVERSAL_NAT_BHND_PEER))) {
loglog(RC_LOG_SERIOUS, "NAT-Traversal: received %d NAT-OA. "
"ignored because peer is not NATed", i);
return;
}
else if (i>1) {
loglog(RC_LOG_SERIOUS, "NAT-Traversal: received %d NAT-OA. "
"using first, ignoring others", i);
}
/** Take first **/
p = md->chain[ISAKMP_NEXT_NATOA_R];
DBG(DBG_PARSING,
DBG_dump("NAT-OA:", p->pbs.start, pbs_room(&p->pbs));
);
int pbs_room_get(pb_stream *pbs) {
return pbs_room(pbs);
}
void recv_pcap_packet_gen(u_char *user,
const struct pcap_pkthdr *h,
const u_char *bytes)
{
struct msg_digest *md;
u_int32_t *dlt;
struct iphdr *ip;
struct udphdr *udp;
u_char *ike;
const struct iface_port *ifp = &if1;
int packet_len;
err_t from_ugh;
union {
struct sockaddr sa;
struct sockaddr_in sa_in4;
struct sockaddr_in6 sa_in6;
} from;
md = alloc_md();
dlt = (u_int32_t *)bytes;
if (*dlt != PF_INET)
return;
ip = (struct iphdr *)(dlt + 1);
udp = (struct udphdr *)(dlt + ip->ihl + 1);
ike = (u_char *)(udp + 1);
from.sa_in4.sin_addr.s_addr = ip->saddr;
from.sa_in4.sin_port = udp->source;
md->iface = ifp;
packet_len = h->len - (ike - bytes);
happy(anyaddr(addrtypeof(&ifp->ip_addr), &md->sender));
from_ugh = initaddr((void *) &from.sa_in4.sin_addr,
sizeof(from.sa_in4.sin_addr),
AF_INET, &md->sender);
setportof(from.sa_in4.sin_port, &md->sender);
md->sender_port = ntohs(from.sa_in4.sin_port);
cur_from = &md->sender;
cur_from_port = md->sender_port;
/* Clone actual message contents
* and set up md->packet_pbs to describe it.
*/
init_pbs(&md->packet_pbs,
clone_bytes(ike, packet_len,
"message buffer in comm_handle()"),
packet_len, "packet");
DBG_log("*received %d bytes from %s:%u on %s (port=%d)",
(int) pbs_room(&md->packet_pbs),
ip_str(&md->sender), (unsigned) md->sender_port,
ifp->ip_dev->id_rname,
ifp->port);
DBG_dump("", md->packet_pbs.start, pbs_room(&md->packet_pbs));
process_packet(&md);
if (md != NULL)
release_md(md);
cur_state = NULL;
reset_cur_connection();
cur_from = NULL;
}
static stf_status aggr_inI1_outR1_common(struct msg_digest *md,
int authtype)
{
/* With Aggressive Mode, we get an ID payload in this, the first
* message, so we can use it to index the preshared-secrets
* when the IP address would not be meaningful (i.e. Road
* Warrior). So our first task is to unravel the ID payload.
*/
struct state *st;
struct payload_digest *const sa_pd = md->chain[ISAKMP_NEXT_SA];
struct connection *c = find_host_connection(&md->iface->ip_addr,
md->iface->port,
&md->sender,
md->sender_port, LEMPTY);
#if 0
if (c == NULL && md->iface->ike_float) {
c = find_host_connection(&md->iface->addr,
pluto_nat_port,
&md->sender, md->sender_port, LEMPTY);
}
#endif
if (c == NULL) {
/* see if a wildcarded connection can be found */
pb_stream pre_sa_pbs = sa_pd->pbs;
lset_t policy = preparse_isakmp_sa_body(&pre_sa_pbs) |
POLICY_AGGRESSIVE;
c = find_host_connection(&md->iface->ip_addr, pluto_port,
(ip_address*)NULL, md->sender_port,
policy);
if (c == NULL || (c->policy & POLICY_AGGRESSIVE) == 0) {
ipstr_buf b;
loglog(RC_LOG_SERIOUS, "initial Aggressive Mode message from %s"
" but no (wildcard) connection has been configured%s%s",
ipstr(&md->sender, &b),
(policy != LEMPTY) ? " with policy=" : "",
(policy != LEMPTY) ?
bitnamesof(sa_policy_bit_names, policy) : "");
/* XXX notification is in order! */
return STF_IGNORE;
}
/* Create a temporary connection that is a copy of this one.
* His ID isn't declared yet.
*/
c = rw_instantiate(c, &md->sender, NULL, NULL);
}
/* Set up state */
cur_state = md->st = st = new_state(); /* (caller will reset cur_state) */
st->st_connection = c;
st->st_remoteaddr = md->sender;
st->st_remoteport = md->sender_port;
st->st_localaddr = md->iface->ip_addr;
st->st_localport = md->iface->port;
st->st_interface = md->iface;
change_state(st, STATE_AGGR_R1);
/* until we have clue who this is, then be conservative about allocating
* them any crypto bandwidth
*/
st->st_import = pcim_stranger_crypto;
st->st_policy |= POLICY_AGGRESSIVE;
st->st_oakley.auth = authtype;
if (!ikev1_decode_peer_id(md, FALSE, TRUE)) {
char buf[IDTOA_BUF];
ipstr_buf b;
(void) idtoa(&st->st_connection->spd.that.id, buf,
sizeof(buf));
loglog(RC_LOG_SERIOUS,
"initial Aggressive Mode packet claiming to be from %s"
" on %s but no connection has been authorized",
buf, ipstr(&md->sender, &b));
/* XXX notification is in order! */
return STF_FAIL + INVALID_ID_INFORMATION;
}
c = st->st_connection;
extra_debugging(c);
st->st_try = 0; /* Not our job to try again from start */
st->st_policy = c->policy & ~POLICY_IPSEC_MASK; /* only as accurate as connection */
memcpy(st->st_icookie, md->hdr.isa_icookie, COOKIE_SIZE);
get_cookie(FALSE, st->st_rcookie, COOKIE_SIZE, &md->sender);
insert_state(st); /* needs cookies, connection, and msgid (0) */
st->st_doi = ISAKMP_DOI_IPSEC;
st->st_situation = SIT_IDENTITY_ONLY; /* We only support this */
{
ipstr_buf b;
libreswan_log("responding to Aggressive Mode, state #%lu, connection \"%s\" from %s",
st->st_serialno, st->st_connection->name,
ipstr(&c->spd.that.host_addr, &b));
}
merge_quirks(st, md);
set_nat_traversal(st, md);
/* save initiator SA for HASH */
clonereplacechunk(st->st_p1isa, sa_pd->pbs.start,
pbs_room(&sa_pd->pbs), "sa in aggr_inI1_outR1()");
/*
* parse_isakmp_sa picks the right group, which we need to know
* before we do any calculations. We will call it again to have it
* emit the winning SA into the output.
*/
/* SA body in */
{
pb_stream sabs = sa_pd->pbs;
RETURN_STF_FAILURE(parse_isakmp_sa_body(&sabs,
&sa_pd->payload.sa,
NULL, FALSE, st));
}
/* KE in */
RETURN_STF_FAILURE(accept_KE(&st->st_gi, "Gi", st->st_oakley.group,
&md->chain[ISAKMP_NEXT_KE]->pbs));
/* Ni in */
RETURN_STF_FAILURE(accept_v1_nonce(md, &st->st_ni, "Ni"));
{
struct ke_continuation *ke = alloc_thing(
struct ke_continuation,
"outI2 KE");
ke->ke_md = md;
set_suspended(st, md);
if (!st->st_sec_in_use) {
/* need to calculate KE and Nonce */
pcrc_init(&ke->ke_pcrc, aggr_inI1_outR1_continue1);
return build_ke(&ke->ke_pcrc, st, st->st_oakley.group,
st->st_import);
} else {
/* KE and Nonce calculated */
ke->ke_pcrc.pcrc_serialno = st->st_serialno; /* transitional */
return aggr_inI1_outR1_tail(&ke->ke_pcrc, NULL);
}
}
}
