133 lines
4.8 KiB
OCaml
133 lines
4.8 KiB
OCaml
(* (c) 2018 Hannes Mehnert, all rights reserved *)
|
|
|
|
open Lwt.Infix
|
|
|
|
let my_version = `AV3
|
|
|
|
let command = ref 0L
|
|
|
|
let tls_config cacert cert priv_key =
|
|
X509_lwt.private_of_pems ~cert ~priv_key >>= fun cert ->
|
|
X509_lwt.certs_of_pem cacert >>= (function
|
|
| [ ca ] -> Lwt.return ca
|
|
| _ -> Lwt.fail_with "expect single ca as cacert") >|= fun ca ->
|
|
(Tls.(Config.server ~version:(Core.TLS_1_2, Core.TLS_1_2)
|
|
~reneg:true ~certificates:(`Single cert) ()),
|
|
ca)
|
|
|
|
let connect socket_path =
|
|
let c = Lwt_unix.(socket PF_UNIX SOCK_STREAM 0) in
|
|
Lwt_unix.connect c (Lwt_unix.ADDR_UNIX socket_path) >|= fun () ->
|
|
c
|
|
|
|
let client_auth ca tls =
|
|
let authenticator =
|
|
let time = Ptime_clock.now () in
|
|
X509.Authenticator.chain_of_trust ~time (* ~crls:!state.Vmm_engine.crls *) [ca]
|
|
in
|
|
Lwt.catch
|
|
(fun () -> Tls_lwt.Unix.reneg ~authenticator tls)
|
|
(fun e ->
|
|
(match e with
|
|
| Tls_lwt.Tls_alert a -> Logs.err (fun m -> m "TLS ALERT %s" (Tls.Packet.alert_type_to_string a))
|
|
| Tls_lwt.Tls_failure f -> Logs.err (fun m -> m "TLS FAILURE %s" (Tls.Engine.string_of_failure f))
|
|
| exn -> Logs.err (fun m -> m "%s" (Printexc.to_string exn))) ;
|
|
Lwt.fail e) >>= fun () ->
|
|
(match Tls_lwt.Unix.epoch tls with
|
|
| `Ok epoch -> Lwt.return epoch.Tls.Core.peer_certificate_chain
|
|
| `Error -> Lwt.fail_with "error while getting epoch")
|
|
|
|
let read fd tls =
|
|
(* now we busy read and process output *)
|
|
let rec loop () =
|
|
Vmm_lwt.read_wire fd >>= function
|
|
| Error _ -> Lwt.return (Error (`Msg "exception while reading"))
|
|
| Ok wire ->
|
|
Logs.debug (fun m -> m "read proxying %a" Vmm_commands.pp_wire wire) ;
|
|
Vmm_tls_lwt.write_tls tls wire >>= function
|
|
| Ok () -> loop ()
|
|
| Error `Exception -> Lwt.return (Error (`Msg "exception"))
|
|
in
|
|
loop ()
|
|
|
|
let process fd tls =
|
|
Vmm_lwt.read_wire fd >>= function
|
|
| Error _ -> Lwt.return (Error (`Msg "read error"))
|
|
| Ok wire ->
|
|
(* TODO check version *)
|
|
Logs.debug (fun m -> m "proxying %a" Vmm_commands.pp_wire wire) ;
|
|
Vmm_tls_lwt.write_tls tls wire >|= function
|
|
| Ok () -> Ok ()
|
|
| Error `Exception -> Error (`Msg "exception on write")
|
|
|
|
let handle ca tls =
|
|
client_auth ca tls >>= fun chain ->
|
|
match Vmm_tls.handle my_version chain with
|
|
| Error (`Msg m) -> Lwt.fail_with m
|
|
| Ok (name, policies, cmd) ->
|
|
let sock, next = Vmm_commands.endpoint cmd in
|
|
connect (Vmm_core.socket_path sock) >>= fun fd ->
|
|
(match sock with
|
|
| `Vmmd ->
|
|
Lwt_list.fold_left_s (fun r (id, policy) ->
|
|
match r with
|
|
| Error (`Msg msg) -> Lwt.return (Error (`Msg msg))
|
|
| Ok () ->
|
|
Logs.debug (fun m -> m "adding policy for %a: %a" Vmm_core.Name.pp id Vmm_core.Policy.pp policy) ;
|
|
let header = Vmm_commands.{version = my_version ; sequence = !command ; name = id } in
|
|
command := Int64.succ !command ;
|
|
Vmm_lwt.write_wire fd (header, `Command (`Policy_cmd (`Policy_add policy))) >>= function
|
|
| Error `Exception -> Lwt.return (Error (`Msg "failed to write policy"))
|
|
| Ok () ->
|
|
Vmm_lwt.read_wire fd >|= function
|
|
(* TODO check version *)
|
|
| Error _ -> Error (`Msg "read error after writing policy")
|
|
| Ok (_, `Success _) -> Ok ()
|
|
| Ok wire ->
|
|
Rresult.R.error_msgf
|
|
"expected success when adding policy, got: %a"
|
|
Vmm_commands.pp_wire wire)
|
|
(Ok ()) policies
|
|
| _ -> Lwt.return (Ok ())) >>= function
|
|
| Error (`Msg msg) ->
|
|
begin
|
|
Logs.warn (fun m -> m "error while applying policies %s" msg) ;
|
|
let wire =
|
|
let header = Vmm_commands.{version = my_version ; sequence = 0L ; name } in
|
|
header, `Failure msg
|
|
in
|
|
Vmm_tls_lwt.write_tls tls wire >>= fun _ ->
|
|
Vmm_lwt.safe_close fd >>= fun () ->
|
|
Lwt.fail_with msg
|
|
end
|
|
| Ok () ->
|
|
let wire =
|
|
let header = Vmm_commands.{version = my_version ; sequence = !command ; name } in
|
|
command := Int64.succ !command ;
|
|
(header, `Command cmd)
|
|
in
|
|
Vmm_lwt.write_wire fd wire >>= function
|
|
| Error `Exception ->
|
|
Vmm_lwt.safe_close fd >>= fun () ->
|
|
Lwt.return (Error (`Msg "couldn't write"))
|
|
| Ok () ->
|
|
(match next with
|
|
| `Read -> read fd tls
|
|
| `End -> process fd tls) >>= fun res ->
|
|
Vmm_lwt.safe_close fd >|= fun () ->
|
|
res
|
|
|
|
open Cmdliner
|
|
|
|
let cacert =
|
|
let doc = "CA certificate" in
|
|
Arg.(required & pos 0 (some file) None & info [] ~doc ~docv:"CA")
|
|
|
|
let cert =
|
|
let doc = "Certificate" in
|
|
Arg.(required & pos 1 (some file) None & info [] ~doc ~docv:"CERT")
|
|
|
|
let key =
|
|
let doc = "Private key" in
|
|
Arg.(required & pos 2 (some file) None & info [] ~doc ~docv:"KEY")
|