albatross/provision/vmm_provision.ml
2018-01-06 14:20:23 +01:00

134 lines
4.5 KiB
OCaml

(* (c) 2017 Hannes Mehnert, all rights reserved *)
let asn_version = `AV0
let setup_log style_renderer level =
Fmt_tty.setup_std_outputs ?style_renderer ();
Logs.set_level level;
Logs.set_reporter (Logs_fmt.reporter ~dst:Format.std_formatter ())
let l_exts =
[ (true, `Key_usage [ `Digital_signature ; `Key_encipherment ])
; (true, `Basic_constraints (false, None))
; (true, `Ext_key_usage [`Client_auth]) ]
let d_exts ?len () =
[ (true, (`Basic_constraints (true, len)))
; (true, (`Key_usage [ `Key_cert_sign ; `CRL_sign ; `Digital_signature ; `Content_commitment ])) ]
let timestamps validity =
let now = Ptime_clock.now () in
match Ptime.add_span now (Ptime.Span.of_int_s (Duration.to_sec validity)) with
| None -> Error (`Msg "span too big - reached end of ptime")
| Some exp -> Ok (now, exp)
let rec safe f arg =
try Ok (f arg) with
| Unix.Unix_error (Unix.EINTR, _, _) -> safe f arg
| Unix.Unix_error (e, _, _) -> Error (`Msg (Unix.error_message e))
(* TODO: is this useful elsewhere? *)
let append name data =
let open Rresult.R.Infix in
let buf = Bytes.unsafe_of_string data in
let nam = Fpath.to_string name in
safe Unix.(openfile nam [ O_APPEND ; O_CREAT ; O_WRONLY ]) 0o644 >>= fun fd ->
let len = String.length data in
let rec go off =
let l = len - off in
safe (Unix.write fd buf off) l >>= fun w ->
if l = w then Ok ()
else go (w + off)
in
go 0 >>= fun () ->
safe Unix.close fd
let key_ids pub issuer =
let auth = (Some (X509.key_id issuer), [], None) in
[ (false, `Subject_key_id (X509.key_id pub)) ; (false, `Authority_key_id auth) ]
let sign ?dbname ?certname extensions issuer key csr delta =
let open Rresult.R.Infix in
(match certname with
| Some x -> Ok x
| None ->
(try Ok (List.find (function `CN _ -> true | _ -> false) (X509.CA.info csr).X509.CA.subject)
with Not_found -> Error (`Msg "unable to discover certificate name")) >>= fun nam ->
match nam with
| `CN name -> Ok name
| _ -> Error (`Msg "cannot happen")) >>= fun certname ->
(match dbname with
| None -> Ok None
| Some dbname ->
Bos.OS.File.exists dbname >>= function
| false -> Ok None
| true ->
Bos.OS.File.read_lines dbname >>= fun content ->
Vmm_core.parse_db content >>= fun db ->
match Vmm_core.find_name db certname with
| Ok serial ->
Logs.info (fun m -> m "reusing serial %s" (Z.to_string serial)) ;
Ok (Some serial)
| Error _ -> Ok None) >>= fun serial ->
timestamps delta >>= fun (valid_from, valid_until) ->
let extensions =
match dbname with
| None -> extensions (* evil hack to avoid issuer + public key for CA cert *)
| Some _ ->
match key with
| `RSA priv ->
let capub = `RSA (Nocrypto.Rsa.pub_of_priv priv) in
extensions @ key_ids (X509.CA.info csr).X509.CA.public_key capub
in
let cert = X509.CA.sign csr ?serial ~valid_from ~valid_until ~extensions key issuer in
(match serial, dbname with
| Some _, _ -> Ok () (* already in DB! *)
| _, None -> Ok () (* no DB! *)
| None, Some dbname ->
append dbname (Printf.sprintf "%s %s\n" (Z.to_string (X509.serial cert)) certname)) >>= fun () ->
let enc = X509.Encoding.Pem.Certificate.to_pem_cstruct1 cert in
Bos.OS.File.write Fpath.(v certname + "pem") (Cstruct.to_string enc)
let priv_key ?(bits = 2048) fn name =
let open Rresult.R.Infix in
let file = match fn with
| None -> Fpath.(v name + "key")
| Some f -> Fpath.v f
in
Bos.OS.File.exists file >>= function
| false ->
Logs.info (fun m -> m "creating new RSA key %a" Fpath.pp file) ;
let priv = `RSA (Nocrypto.Rsa.generate bits) in
Bos.OS.File.write ~mode:0o400 file (Cstruct.to_string (X509.Encoding.Pem.Private_key.to_pem_cstruct1 priv)) >>= fun () ->
Ok priv
| true ->
Bos.OS.File.read file >>= fun s ->
Ok (X509.Encoding.Pem.Private_key.of_pem_cstruct1 (Cstruct.of_string s))
open Cmdliner
let setup_log =
Term.(const setup_log
$ Fmt_cli.style_renderer ()
$ Logs_cli.level ())
let nam =
let doc = "Name to provision" in
Arg.(required & pos 0 (some string) None & info [] ~doc)
let cacert =
let doc = "cacert" in
Arg.(required & pos 1 (some file) None & info [] ~doc)
let key =
let doc = "Private key" in
Arg.(value & opt (some file) None & info [ "key" ] ~doc)
let db =
let doc = "Database" in
Arg.(required & pos 0 (some string) None & info [] ~doc)
let mem =
let doc = "Memory to provision" in
Arg.(required & pos 2 (some int) None & info [] ~doc)