qubes-mirage-firewall/client_net.ml

168 lines
7.0 KiB
OCaml

(* Copyright (C) 2015, Thomas Leonard <thomas.leonard@unikernel.com>
See the README file for details. *)
open Lwt.Infix
open Fw_utils
module Netback = Netchannel.Backend.Make(Netchannel.Xenstore.Make(Xen_os.Xs))
module ClientEth = Ethernet.Make(Netback)
let src = Logs.Src.create "client_net" ~doc:"Client networking"
module Log = (val Logs.src_log src : Logs.LOG)
let writev eth dst proto fillfn =
Lwt.catch
(fun () ->
ClientEth.write eth dst proto fillfn >|= function
| Ok () -> ()
| Error e ->
Log.err (fun f -> f "error trying to send to client: @[%a@]"
ClientEth.pp_error e);
)
(fun ex ->
(* Usually Netback_shutdown, because the client disconnected *)
Log.err (fun f -> f "uncaught exception trying to send to client: @[%s@]"
(Printexc.to_string ex));
Lwt.return_unit
)
class client_iface eth ~domid ~gateway_ip ~client_ip client_mac : client_link =
let log_header = Fmt.str "dom%d:%a" domid Ipaddr.V4.pp client_ip in
object
val mutable rules = []
method get_rules = rules
method set_rules new_db = rules <- Dao.read_rules new_db client_ip
method my_mac = ClientEth.mac eth
method other_mac = client_mac
method my_ip = gateway_ip
method other_ip = client_ip
method writev proto fillfn =
writev eth client_mac proto fillfn
method log_header = log_header
end
let clients : Cleanup.t Dao.VifMap.t ref = ref Dao.VifMap.empty
(** Handle an ARP message from the client. *)
let input_arp ~fixed_arp ~iface request =
match Arp_packet.decode request with
| Error e ->
Log.warn (fun f -> f "Ignored unknown ARP message: %a" Arp_packet.pp_error e);
Lwt.return_unit
| Ok arp ->
match Client_eth.ARP.input fixed_arp arp with
| None -> Lwt.return_unit
| Some response ->
iface#writev `ARP (fun b -> Arp_packet.encode_into response b; Arp_packet.size)
(** Handle an IPv4 packet from the client. *)
let input_ipv4 get_ts cache ~iface ~router dns_client dns_servers packet =
let cache', r = Nat_packet.of_ipv4_packet !cache ~now:(get_ts ()) packet in
cache := cache';
match r with
| Error e ->
Log.warn (fun f -> f "Ignored unknown IPv4 message: %a" Nat_packet.pp_error e);
Lwt.return_unit
| Ok None -> Lwt.return_unit
| Ok (Some packet) ->
let `IPv4 (ip, _) = packet in
let src = ip.Ipv4_packet.src in
if src = iface#other_ip then Firewall.ipv4_from_client dns_client dns_servers router ~src:iface packet
else (
Log.warn (fun f -> f "Incorrect source IP %a in IP packet from %a (dropping)"
Ipaddr.V4.pp src Ipaddr.V4.pp iface#other_ip);
Lwt.return_unit
)
(** Connect to a new client's interface and listen for incoming frames and firewall rule changes. *)
let add_vif get_ts { Dao.ClientVif.domid; device_id } dns_client dns_servers ~client_ip ~router ~cleanup_tasks qubesDB =
Netback.make ~domid ~device_id >>= fun backend ->
Log.info (fun f -> f "Client %d (IP: %s) ready" domid (Ipaddr.V4.to_string client_ip));
ClientEth.connect backend >>= fun eth ->
let client_mac = Netback.frontend_mac backend in
let client_eth = router.Router.clients in
let gateway_ip = Client_eth.client_gw client_eth in
let iface = new client_iface eth ~domid ~gateway_ip ~client_ip client_mac in
(* update the rules whenever QubesDB notices a change for this IP *)
let qubesdb_updater =
Lwt.catch
(fun () ->
let rec update current_db current_rules =
Qubes.DB.got_new_commit qubesDB (Dao.db_root client_ip) current_db >>= fun new_db ->
iface#set_rules new_db;
let new_rules = iface#get_rules in
(if current_rules = new_rules then
Log.debug (fun m -> m "Rules did not change for %s" (Ipaddr.V4.to_string client_ip))
else begin
Log.debug (fun m -> m "New firewall rules for %s@.%a"
(Ipaddr.V4.to_string client_ip)
Fmt.(list ~sep:(any "@.") Pf_qubes.Parse_qubes.pp_rule) new_rules);
(* empty NAT table if rules are updated: they might deny old connections *)
My_nat.remove_connections router.Router.nat client_ip;
end);
update new_db new_rules
in
update Qubes.DB.KeyMap.empty [])
(function Lwt.Canceled -> Lwt.return_unit | e -> Lwt.fail e)
in
Cleanup.on_cleanup cleanup_tasks (fun () -> Lwt.cancel qubesdb_updater);
Router.add_client router iface >>= fun () ->
Cleanup.on_cleanup cleanup_tasks (fun () -> Router.remove_client router iface);
let fixed_arp = Client_eth.ARP.create ~net:client_eth iface in
let fragment_cache = ref (Fragments.Cache.empty (256 * 1024)) in
let listener =
Lwt.catch
(fun () ->
Netback.listen backend ~header_size:Ethernet.Packet.sizeof_ethernet (fun frame ->
match Ethernet.Packet.of_cstruct frame with
| Error err -> Log.warn (fun f -> f "Invalid Ethernet frame: %s" err); Lwt.return_unit
| Ok (eth, payload) ->
match eth.Ethernet.Packet.ethertype with
| `ARP -> input_arp ~fixed_arp ~iface payload
| `IPv4 -> input_ipv4 get_ts fragment_cache ~iface ~router dns_client dns_servers payload
| `IPv6 -> Lwt.return_unit (* TODO: oh no! *)
)
>|= or_raise "Listen on client interface" Netback.pp_error)
(function Lwt.Canceled -> Lwt.return_unit | e -> Lwt.fail e)
in
Cleanup.on_cleanup cleanup_tasks (fun () -> Lwt.cancel listener);
Lwt.pick [ qubesdb_updater ; listener ]
(** A new client VM has been found in XenStore. Find its interface and connect to it. *)
let add_client get_ts dns_client dns_servers ~router vif client_ip qubesDB =
let cleanup_tasks = Cleanup.create () in
Log.info (fun f -> f "add client vif %a with IP %a"
Dao.ClientVif.pp vif Ipaddr.V4.pp client_ip);
Lwt.async (fun () ->
Lwt.catch (fun () ->
add_vif get_ts vif dns_client dns_servers ~client_ip ~router ~cleanup_tasks qubesDB
)
(fun ex ->
Log.warn (fun f -> f "Error with client %a: %s"
Dao.ClientVif.pp vif (Printexc.to_string ex));
Lwt.return_unit
)
);
cleanup_tasks
(** Watch XenStore for notifications of new clients. *)
let listen get_ts dns_client dns_servers qubesDB router =
Dao.watch_clients (fun new_set ->
(* Check for removed clients *)
!clients |> Dao.VifMap.iter (fun key cleanup ->
if not (Dao.VifMap.mem key new_set) then (
clients := !clients |> Dao.VifMap.remove key;
Log.info (fun f -> f "client %a has gone" Dao.ClientVif.pp key);
Cleanup.cleanup cleanup
)
);
(* Check for added clients *)
new_set |> Dao.VifMap.iter (fun key ip_addr ->
if not (Dao.VifMap.mem key !clients) then (
let cleanup = add_client get_ts dns_client dns_servers ~router key ip_addr qubesDB in
Log.debug (fun f -> f "client %a arrived" Dao.ClientVif.pp key);
clients := !clients |> Dao.VifMap.add key cleanup
)
)
)