void
process_incoming_link_part2 (struct context *c, struct link_socket_info *lsi, const uint8_t *orig_buf)
{
if (c->c2.buf.len > 0)
{
#ifdef ENABLE_FRAGMENT
if (c->c2.fragment)
fragment_incoming (c->c2.fragment, &c->c2.buf, &c->c2.frame_fragment);
#endif
#ifdef USE_COMP
/* decompress the incoming packet */
if (c->c2.comp_context)
(*c->c2.comp_context->alg.decompress)(&c->c2.buf, c->c2.buffers->decompress_buf, c->c2.comp_context, &c->c2.frame);
#endif
#ifdef PACKET_TRUNCATION_CHECK
/* if (c->c2.buf.len > 1) --c->c2.buf.len; */
ipv4_packet_size_verify (BPTR (&c->c2.buf),
BLEN (&c->c2.buf),
TUNNEL_TYPE (c->c1.tuntap),
"POST_DECRYPT",
&c->c2.n_trunc_post_decrypt);
#endif
/*
* Set our "official" outgoing address, since
* if buf.len is non-zero, we know the packet
* authenticated. In TLS mode we do nothing
* because TLS mode takes care of source address
* authentication.
*
* Also, update the persisted version of our packet-id.
*/
if (!TLS_MODE (c))
link_socket_set_outgoing_addr (&c->c2.buf, lsi, &c->c2.from, NULL, c->c2.es);
/* reset packet received timer */
if (c->options.ping_rec_timeout && c->c2.buf.len > 0)
event_timeout_reset (&c->c2.ping_rec_interval);
/* increment authenticated receive byte count */
if (c->c2.buf.len > 0)
{
c->c2.link_read_bytes_auth += c->c2.buf.len;
c->c2.max_recv_size_local = max_int (c->c2.original_recv_size, c->c2.max_recv_size_local);
}
/* Did we just receive an openvpn ping packet? */
if (is_ping_msg (&c->c2.buf))
{
dmsg (D_PING, "RECEIVED PING PACKET");
c->c2.buf.len = 0; /* drop packet */
}
#ifdef ENABLE_OCC
/* Did we just receive an OCC packet? */
if (is_occ_msg (&c->c2.buf))
process_received_occ_msg (c);
#endif
buffer_turnover (orig_buf, &c->c2.to_tun, &c->c2.buf, &c->c2.buffers->read_link_buf);
/* to_tun defined + unopened tuntap can cause deadlock */
if (!tuntap_defined (c->c1.tuntap))
c->c2.to_tun.len = 0;
}
else
{
buf_reset (&c->c2.to_tun);
}
}
void
process_incoming_link (struct context *c)
{
struct gc_arena gc = gc_new ();
bool decrypt_status;
struct link_socket_info *lsi = get_link_socket_info (c);
const uint8_t *orig_buf = c->c2.buf.data;
perf_push (PERF_PROC_IN_LINK);
if (c->c2.buf.len > 0)
{
c->c2.link_read_bytes += c->c2.buf.len;
link_read_bytes_global += c->c2.buf.len;
#ifdef ENABLE_MEMSTATS
if (mmap_stats)
mmap_stats->link_read_bytes = link_read_bytes_global;
#endif
c->c2.original_recv_size = c->c2.buf.len;
#ifdef ENABLE_MANAGEMENT
if (management)
{
management_bytes_in (management, c->c2.buf.len);
#ifdef MANAGEMENT_DEF_AUTH
management_bytes_server (management, &c->c2.link_read_bytes, &c->c2.link_write_bytes, &c->c2.mda_context);
#endif
}
#endif
}
else
c->c2.original_recv_size = 0;
#ifdef ENABLE_DEBUG
/* take action to corrupt packet if we are in gremlin test mode */
if (c->options.gremlin) {
if (!ask_gremlin (c->options.gremlin))
c->c2.buf.len = 0;
corrupt_gremlin (&c->c2.buf, c->options.gremlin);
}
#endif
/* log incoming packet */
#ifdef LOG_RW
if (c->c2.log_rw && c->c2.buf.len > 0)
fprintf (stderr, "R");
#endif
msg (D_LINK_RW, "%s READ [%d] from %s: %s",
proto2ascii (lsi->proto, true),
BLEN (&c->c2.buf),
print_link_socket_actual (&c->c2.from, &gc),
PROTO_DUMP (&c->c2.buf, &gc));
/*
* Good, non-zero length packet received.
* Commence multi-stage processing of packet,
* such as authenticate, decrypt, decompress.
* If any stage fails, it sets buf.len to 0 or -1,
* telling downstream stages to ignore the packet.
*/
if (c->c2.buf.len > 0)
{
if (!link_socket_verify_incoming_addr (&c->c2.buf, lsi, &c->c2.from))
link_socket_bad_incoming_addr (&c->c2.buf, lsi, &c->c2.from);
#ifdef ENABLE_CRYPTO
#ifdef ENABLE_SSL
if (c->c2.tls_multi)
{
/*
* If tls_pre_decrypt returns true, it means the incoming
* packet was a good TLS control channel packet. If so, TLS code
* will deal with the packet and set buf.len to 0 so downstream
* stages ignore it.
*
* If the packet is a data channel packet, tls_pre_decrypt
* will load crypto_options with the correct encryption key
* and return false.
*/
if (tls_pre_decrypt (c->c2.tls_multi, &c->c2.from, &c->c2.buf, &c->c2.crypto_options))
{
interval_action (&c->c2.tmp_int);
/* reset packet received timer if TLS packet */
if (c->options.ping_rec_timeout)
event_timeout_reset (&c->c2.ping_rec_interval);
}
}
#if P2MP_SERVER
/*
* Drop non-TLS packet if client-connect script/plugin has not
* yet succeeded.
*/
if (c->c2.context_auth != CAS_SUCCEEDED)
c->c2.buf.len = 0;
#endif
#endif /* ENABLE_SSL */
/* authenticate and decrypt the incoming packet */
decrypt_status = openvpn_decrypt (&c->c2.buf, c->c2.buffers->decrypt_buf, &c->c2.crypto_options, &c->c2.frame);
if (!decrypt_status && link_socket_connection_oriented (c->c2.link_socket))
{
/* decryption errors are fatal in TCP mode */
register_signal (c, SIGUSR1, "decryption-error"); /* SOFT-SIGUSR1 -- decryption error in TCP mode */
msg (D_STREAM_ERRORS, "Fatal decryption error (process_incoming_link), restarting");
goto done;
}
#endif /* ENABLE_CRYPTO */
#ifdef ENABLE_FRAGMENT
if (c->c2.fragment)
fragment_incoming (c->c2.fragment, &c->c2.buf, &c->c2.frame_fragment);
#endif
#ifdef ENABLE_LZO
/* decompress the incoming packet */
if (lzo_defined (&c->c2.lzo_compwork))
lzo_decompress (&c->c2.buf, c->c2.buffers->lzo_decompress_buf, &c->c2.lzo_compwork, &c->c2.frame);
#endif
#ifdef PACKET_TRUNCATION_CHECK
/* if (c->c2.buf.len > 1) --c->c2.buf.len; */
ipv4_packet_size_verify (BPTR (&c->c2.buf),
BLEN (&c->c2.buf),
TUNNEL_TYPE (c->c1.tuntap),
"POST_DECRYPT",
&c->c2.n_trunc_post_decrypt);
#endif
/*
* Set our "official" outgoing address, since
* if buf.len is non-zero, we know the packet
* authenticated. In TLS mode we do nothing
* because TLS mode takes care of source address
* authentication.
*
* Also, update the persisted version of our packet-id.
*/
if (!TLS_MODE (c))
link_socket_set_outgoing_addr (&c->c2.buf, lsi, &c->c2.from, NULL, c->c2.es);
/* reset packet received timer */
if (c->options.ping_rec_timeout && c->c2.buf.len > 0)
event_timeout_reset (&c->c2.ping_rec_interval);
/* increment authenticated receive byte count */
if (c->c2.buf.len > 0)
{
c->c2.link_read_bytes_auth += c->c2.buf.len;
c->c2.max_recv_size_local = max_int (c->c2.original_recv_size, c->c2.max_recv_size_local);
}
/* Did we just receive an openvpn ping packet? */
if (is_ping_msg (&c->c2.buf))
{
dmsg (D_PING, "RECEIVED PING PACKET");
c->c2.buf.len = 0; /* drop packet */
}
#ifdef ENABLE_OCC
/* Did we just receive an OCC packet? */
if (is_occ_msg (&c->c2.buf))
process_received_occ_msg (c);
#endif
buffer_turnover (orig_buf, &c->c2.to_tun, &c->c2.buf, &c->c2.buffers->read_link_buf);
/* to_tun defined + unopened tuntap can cause deadlock */
if (!tuntap_defined (c->c1.tuntap))
c->c2.to_tun.len = 0;
}
else
{
buf_reset (&c->c2.to_tun);
}
done:
perf_pop ();
gc_free (&gc);
}
void
process_received_occ_msg (struct context *c)
{
ASSERT (buf_advance (&c->c2.buf, OCC_STRING_SIZE));
switch (buf_read_u8 (&c->c2.buf))
{
case OCC_REQUEST:
dmsg (D_PACKET_CONTENT, "RECEIVED OCC_REQUEST");
c->c2.occ_op = OCC_REPLY;
break;
case OCC_MTU_REQUEST:
dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_REQUEST");
c->c2.occ_op = OCC_MTU_REPLY;
break;
case OCC_MTU_LOAD_REQUEST:
dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_LOAD_REQUEST");
c->c2.occ_mtu_load_size = buf_read_u16 (&c->c2.buf);
if (c->c2.occ_mtu_load_size >= 0)
c->c2.occ_op = OCC_MTU_LOAD;
break;
case OCC_REPLY:
dmsg (D_PACKET_CONTENT, "RECEIVED OCC_REPLY");
if (c->options.occ && !TLS_MODE (c) && c->c2.options_string_remote)
{
if (!options_cmp_equal_safe ((char *) BPTR (&c->c2.buf),
c->c2.options_string_remote,
c->c2.buf.len))
{
options_warning_safe ((char *) BPTR (&c->c2.buf),
c->c2.options_string_remote,
c->c2.buf.len);
}
}
event_timeout_clear (&c->c2.occ_interval);
break;
case OCC_MTU_REPLY:
dmsg (D_PACKET_CONTENT, "RECEIVED OCC_MTU_REPLY");
c->c2.max_recv_size_remote = buf_read_u16 (&c->c2.buf);
c->c2.max_send_size_remote = buf_read_u16 (&c->c2.buf);
if (c->options.mtu_test
&& c->c2.max_recv_size_remote > 0
&& c->c2.max_send_size_remote > 0)
{
msg (M_INFO, "NOTE: Empirical MTU test completed [Tried,Actual] local->remote=[%d,%d] remote->local=[%d,%d]",
c->c2.max_send_size_local,
c->c2.max_recv_size_remote,
c->c2.max_send_size_remote,
c->c2.max_recv_size_local);
if (!c->options.fragment
&& c->options.proto == PROTO_UDPv4
&& c->c2.max_send_size_local > TUN_MTU_MIN
&& (c->c2.max_recv_size_remote < c->c2.max_send_size_local
|| c->c2.max_recv_size_local < c->c2.max_send_size_remote))
msg (M_INFO, "NOTE: This connection is unable to accomodate a UDP packet size of %d. Consider using --fragment or --mssfix options as a workaround.",
c->c2.max_send_size_local);
}
event_timeout_clear (&c->c2.occ_mtu_load_test_interval);
break;
case OCC_EXIT:
dmsg (D_PACKET_CONTENT, "RECEIVED OCC_EXIT");
c->sig->signal_received = SIGTERM;
c->sig->signal_text = "remote-exit";
break;
}
c->c2.buf.len = 0; /* don't pass packet on */
}
