albatross/client/albatross_client_remote_tls.ml

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(* (c) 2017 Hannes Mehnert, all rights reserved *)
open Lwt.Infix
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let rec read_tls_write_cons t =
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Vmm_tls_lwt.read_tls t >>= function
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| Error `Eof ->
Logs.warn (fun m -> m "eof from server");
Lwt.return Albatross_cli.Success
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| Error _ ->
Lwt.return Albatross_cli.Communication_failed
| Ok wire ->
match Albatross_cli.output_result wire with
| Ok () -> read_tls_write_cons t
| Error e -> Lwt.return e
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let client cas host port cert priv_key =
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let auth = if Sys.is_directory cas then `Ca_dir cas else `Ca_file cas in
X509_lwt.authenticator auth >>= fun authenticator ->
Lwt.catch (fun () ->
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(* TODO TLS certificate verification and gethostbyname:
- allow IP address and hostname
- if IP is specified, use it (and no TLS name verification - or SubjAltName with IP?)
- if hostname is specified
- no ip: gethostbyname
- ip: connecto to ip and verify hostname *)
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Lwt_unix.gethostbyname host >>= fun host_entry ->
let host_inet_addr = Array.get host_entry.Lwt_unix.h_addr_list 0 in
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let sockaddr = Lwt_unix.ADDR_INET (host_inet_addr, port) in
Vmm_lwt.connect host_entry.Lwt_unix.h_addrtype sockaddr >>= function
| None ->
Logs.err (fun m -> m "couldn't connect to %a"
Vmm_lwt.pp_sockaddr sockaddr);
Lwt.return Albatross_cli.Connect_failed
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| Some fd ->
X509_lwt.private_of_pems ~cert ~priv_key >>= fun cert ->
let certificates = `Single cert in
let client = Tls.Config.client ~reneg:true ~certificates ~authenticator () in
Tls_lwt.Unix.client_of_fd client (* ~host *) fd >>= fun t ->
read_tls_write_cons t)
(fun exn -> Lwt.return (Albatross_tls_common.classify_tls_error exn))
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let run_client _ cas cert key (host, port) =
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Printexc.register_printer (function
| Tls_lwt.Tls_alert x -> Some ("TLS alert: " ^ Tls.Packet.alert_type_to_string x)
| Tls_lwt.Tls_failure f -> Some ("TLS failure: " ^ Tls.Engine.string_of_failure f)
| _ -> None) ;
Sys.(set_signal sigpipe Signal_ignore) ;
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Lwt_main.run (client cas host port cert key)
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open Cmdliner
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open Albatross_cli
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let cas =
let doc = "The full path to PEM encoded certificate authorities. Can either be a FILE or a DIRECTORY." in
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Arg.(required & pos 0 (some string) None & info [] ~doc ~docv:"CA")
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let client_cert =
let doc = "Use a client certificate chain" in
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Arg.(required & pos 1 (some file) None & info [] ~doc ~docv:"CERT")
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let client_key =
let doc = "Use a client key" in
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Arg.(required & pos 2 (some file) None & info [] ~doc ~docv:"KEY")
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let destination =
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let doc = "the destination hostname:port to connect to" in
Arg.(required & pos 3 (some host_port) None & info [] ~docv:"HOST:PORT" ~doc)
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let cmd =
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let doc = "Albatross remote TLS client" in
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let man = [
`S "DESCRIPTION" ;
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`P "$(tname) connects to an Albatross server and initiates a TLS handshake" ]
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in
let exits = auth_exits @ exits in
Term.(const run_client $ setup_log $ cas $ client_cert $ client_key $ destination),
Term.info "albatross_client_remote_tls" ~version ~doc ~man ~exits
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let () =
match Term.eval cmd with
| `Ok x -> exit (exit_status_to_int x)
| y -> exit (Term.exit_status_of_result y)