Une MAJ de sécurité est nécessaire sur notre version actuelle. Elle sera effectuée lundi 02/08 entre 12h30 et 13h. L'interruption de service devrait durer quelques minutes (probablement moins de 5 minutes).

web_site.ml 28.5 KB
Newer Older
Stephane Glondu's avatar
Stephane Glondu committed
1 2 3
(**************************************************************************)
(*                                BELENIOS                                *)
(*                                                                        *)
Stephane Glondu's avatar
Stephane Glondu committed
4
(*  Copyright © 2012-2014 Inria                                           *)
Stephane Glondu's avatar
Stephane Glondu committed
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
(*                                                                        *)
(*  This program is free software: you can redistribute it and/or modify  *)
(*  it under the terms of the GNU Affero General Public License as        *)
(*  published by the Free Software Foundation, either version 3 of the    *)
(*  License, or (at your option) any later version, with the additional   *)
(*  exemption that compiling, linking, and/or using OpenSSL is allowed.   *)
(*                                                                        *)
(*  This program is distributed in the hope that it will be useful, but   *)
(*  WITHOUT ANY WARRANTY; without even the implied warranty of            *)
(*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *)
(*  Affero General Public License for more details.                       *)
(*                                                                        *)
(*  You should have received a copy of the GNU Affero General Public      *)
(*  License along with this program.  If not, see                         *)
(*  <http://www.gnu.org/licenses/>.                                       *)
(**************************************************************************)

22
open Lwt
23
open Platform
24
open Serializable_j
25
open Signatures
26
open Common
Stephane Glondu's avatar
Stephane Glondu committed
27
open Web_serializable_j
28
open Web_common
29
open Web_signatures
Stephane Glondu's avatar
Stephane Glondu committed
30

31 32 33 34
module type CONFIG = sig
  val name : string
  val path : string list
  val source_file : string
35
  val spool_dir : string
36
  val auth_config : auth_config list
37
end
Stephane Glondu's avatar
Stephane Glondu committed
38

39 40 41 42
let rec list_remove x = function
  | [] -> []
  | y :: ys -> if x = y then ys else y :: (list_remove x ys)

43 44 45 46 47 48 49 50 51 52 53 54
let get_single_line x =
  match_lwt Lwt_stream.get x with
  | None -> return None
  | Some _ as line ->
    lwt b = Lwt_stream.is_empty x in
    if b then (
      return line
    ) else (
      Lwt_stream.junk_while (fun _ -> true) x >>
      return None
    )

55 56
let ( / ) = Filename.concat

57
module Make (C : CONFIG) : SITE = struct
58
  open Eliom_service
Stephane Glondu's avatar
Stephane Glondu committed
59 60
  open Eliom_registration

61 62 63 64 65
  module C = struct
    include C
    let kind = `Site
  end

66 67
  let make_path x = C.path @ x

68
  module Auth = Web_auth.Make (C)
69
  module LwtRandom = MakeLwtRandom (struct let rng = make_rng () end)
Stephane Glondu's avatar
Stephane Glondu committed
70

71 72 73 74 75
  let store = Ocsipersist.open_store C.name

  (* Persistent table, used to initialize the server. *)
  let election_ptable = Ocsipersist.open_table (C.name ^ "_elections")

76 77 78 79 80 81 82 83 84
  (* Table with elections in setup mode. *)
  let election_stable = Ocsipersist.open_table (C.name ^ "_setup")

  (* Table with tokens given to trustees. *)
  let election_pktokens = Ocsipersist.open_table (C.name ^ "_pktokens")

  (* Table with tokens given to credential authorities. *)
  let election_credtokens = Ocsipersist.open_table (C.name ^ "_credtokens")

85 86 87 88 89 90 91 92
  (* In-memory table, indexed by UUID, contains closures. *)
  let election_table = ref SMap.empty

  lwt main_election =
    Ocsipersist.make_persistent store "main_election" None

  lwt featured =
    Ocsipersist.make_persistent store "featured_elections" []
Stephane Glondu's avatar
Stephane Glondu committed
93 94 95 96

  (* The following reference is there to cut a dependency loop:
     S.register_election depends on S (via Templates). It will be set
     to a proper value once we have called Templates.Make. *)
97

98
  let import_election_ref = ref (fun _ -> assert false)
Stephane Glondu's avatar
Stephane Glondu committed
99 100 101 102 103

  (* We use an intermediate module S that will be passed to Templates
     and Web_election. S is not meant to leak and will be included
     in the returned module later. *)

104
  module S : SITE = struct
Stephane Glondu's avatar
Stephane Glondu committed
105
    include Auth.Services
106
    include Auth.Handlers
Stephane Glondu's avatar
Stephane Glondu committed
107 108
    open Eliom_parameter

Stephane Glondu's avatar
Stephane Glondu committed
109 110
    let scope = Eliom_common.default_session_scope

Stephane Glondu's avatar
Stephane Glondu committed
111
    let home = service
112
      ~path:(make_path [""])
Stephane Glondu's avatar
Stephane Glondu committed
113
      ~get_params:unit
114 115
      ()

116 117 118 119 120
    let admin = service
      ~path:(make_path ["admin"])
      ~get_params:unit
      ()

Stephane Glondu's avatar
Stephane Glondu committed
121
    let source_code = service
122
      ~path:(make_path ["belenios.tar.gz"])
Stephane Glondu's avatar
Stephane Glondu committed
123 124 125 126
      ~get_params:unit
      ()

    let get_randomness = service
127
      ~path:(make_path ["get-randomness"])
Stephane Glondu's avatar
Stephane Glondu committed
128 129 130
      ~get_params:unit
      ()

131 132 133 134 135 136 137 138 139 140 141 142
    let new_election = service
      ~path:(make_path ["new-election"])
      ~get_params:unit
      ()

    let new_election_post = post_service
      ~fallback:new_election
      ~post_params:(
        file "election" ** file "metadata"
        ** file "public_keys" ** file "public_creds"
      ) ()

143 144 145
    let tool =
      preapply (static_dir ()) ["tool"; "belenios-tool.html"]

146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
    let election_setup_index = service
      ~path:(make_path ["setup"; ""])
      ~get_params:unit
      ()

    let election_setup_new = post_coservice
      ~csrf_safe:true
      ~fallback:election_setup_index
      ~post_params:unit
      ()

    let election_setup = service
      ~path:(make_path ["setup"; "election"])
      ~get_params:(uuid "uuid")
      ()

    let election_setup_group = post_coservice
      ~fallback:election_setup
      ~post_params:(string "group")
      ()

    let election_setup_metadata = post_coservice
      ~fallback:election_setup
      ~post_params:(string "metadata")
      ()

    let election_setup_questions = post_coservice
      ~fallback:election_setup
      ~post_params:(string "questions")
      ()

    let election_setup_trustee_add = post_coservice
      ~fallback:election_setup
      ~post_params:unit
      ()

    let election_setup_credentials = service
      ~path:(make_path ["setup"; "credentials"])
      ~get_params:(string "token")
      ()

    let election_setup_credentials_download =
      service
        ~path:(make_path ["setup"; "public_creds.txt"])
        ~get_params:(string "token")
        ()

    let election_setup_credentials_post = post_coservice
      ~fallback:election_setup_credentials
      ~post_params:(string "public_creds")
      ()

    let election_setup_credentials_post_file = post_coservice
      ~fallback:election_setup_credentials
      ~post_params:(file "public_creds")
      ()

    let election_setup_trustee = service
      ~path:(make_path ["setup"; "trustee"])
      ~get_params:(string "token")
      ()

    let election_setup_trustee_post = post_coservice
      ~fallback:election_setup_trustee
      ~post_params:(string "public_key")
      ()

    let election_setup_create =
      post_coservice
        ~csrf_safe:true
        ~fallback:election_setup
        ~post_params:unit
        ()

Stephane Glondu's avatar
Stephane Glondu committed
220 221
    let cont = Eliom_reference.eref ~scope
      (fun () () -> Eliom_registration.Redirection.send home)
222

223
    let import_election f = !import_election_ref f
224

225 226 227 228 229 230 231 232 233 234 235 236 237 238
    let add_featured_election x =
      lwt the_featured = Ocsipersist.get featured in
      if List.mem x the_featured then (
        return ()
      ) else if SMap.mem x !election_table then (
        Ocsipersist.set featured (x :: the_featured)
      ) else (
        Lwt.fail Not_found
      )

    let remove_featured_election x =
      lwt the_featured = Ocsipersist.get featured in
      Ocsipersist.set featured (list_remove x the_featured)

239 240 241 242
    let is_featured_election x =
      lwt the_featured = Ocsipersist.get featured in
      return (List.mem x the_featured)

243 244 245 246 247 248 249 250 251
    let set_main_election x =
      if SMap.mem x !election_table then (
        Ocsipersist.set main_election (Some x)
      ) else (
        Lwt.fail Not_found
      )

    let unset_main_election () =
      Ocsipersist.set main_election None
252

Stephane Glondu's avatar
Stephane Glondu committed
253 254
  end

Stephane Glondu's avatar
Stephane Glondu committed
255 256
  include S

257
  module T = Web_templates.Make (S)
Stephane Glondu's avatar
Stephane Glondu committed
258

259 260 261 262 263 264 265 266 267 268 269
  let register_election params web_params =
    let module P = (val params : ELECTION_PARAMS) in
    let uuid = Uuidm.to_string P.params.e_uuid in
    let module D = struct
      module G = P.G
      let election = {
        e_params = P.params;
        e_pks = None;
        e_fingerprint = P.fingerprint;
      }
    end in
270 271
    let module P = (val web_params : WEB_PARAMS) in
    let module R = Web_election.Make (D) (P) in
272
    (module R : Web_election.REGISTRABLE), fun () ->
273 274 275 276 277 278 279 280 281 282
      (* starting from here, we do side-effects on the running server *)
      let module R = R.Register (struct end) in
      let module W = R.W in
      let module X : EMPTY = R.Register (S) (T) in
      let election = (module W : WEB_ELECTION) in
      election_table := SMap.add uuid election !election_table;
      election

  (* Mutex to avoid simultaneous registrations of the same election *)
  let registration_mutex = Lwt_mutex.create ()
Stephane Glondu's avatar
Stephane Glondu committed
283

284
  let () = import_election_ref := fun f ->
285 286 287 288 289 290 291 292
    Lwt_mutex.lock registration_mutex >>
    try_lwt
      lwt raw_election =
        Lwt_io.lines_of_file f.f_election |>
        get_single_line >>=
        (function
        | Some e -> return e
        | None -> Printf.ksprintf
293
          failwith "election.json must contain a single line"
294
        )
295
      in
296 297 298 299 300 301 302 303
      let params = Group.election_params_of_string raw_election in
      let module P = (val params : ELECTION_PARAMS) in
      let uuid = Uuidm.to_string P.params.e_uuid in
      lwt exists =
        try_lwt
          lwt _ = Ocsipersist.find election_ptable uuid in
          return true
        with Not_found -> return false
304
      in
305
      if exists then (
306
        Lwt_mutex.unlock registration_mutex;
307 308 309 310 311 312 313
        return None
      ) else (
        let dir = C.spool_dir/uuid in
        lwt metadata =
          Lwt_io.chars_of_file f.f_metadata |>
          Lwt_stream.to_string >>=
          wrap1 metadata_of_string
314
        in
315 316 317 318 319
        let module X = struct
          let metadata = metadata
          let dir = dir
        end in
        let web_params = (module X : WEB_PARAMS) in
320 321 322
        let r, do_register = register_election params web_params in
        let module R = (val r : Web_election.REGISTRABLE) in
        let module G = R.W.G in
323
        let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
324
        let public_keys = Lwt_io.lines_of_file f.f_public_keys in
325 326 327 328 329 330 331 332 333
        lwt pks = Lwt_stream.(
          clone public_keys |>
          map (trustee_public_key_of_string G.read) |>
          to_list >>= wrap1 Array.of_list
        ) in
        if not (Array.forall KG.check pks) then
          failwith "Public keys are invalid.";
        if not G.(R.W.election.e_params.e_public_key =~ KG.combine pks) then
          failwith "Public keys mismatch with election public key.";
334 335 336 337 338 339 340 341 342
        let public_creds = Lwt_io.lines_of_file f.f_public_creds in
        lwt () = Lwt_stream.(
          clone public_creds |>
          iter_s (fun x ->
            if not G.(check @@ of_string x) then (
              Lwt.fail @@ Failure "Public credentials are invalid."
            ) else return ()
          )
        ) in
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362
        let module R = struct
          let discard () = Lwt_mutex.unlock registration_mutex
          let register () =
            if not (Lwt_mutex.is_locked registration_mutex) then
              failwith "This election can no longer be registered.";
            try_lwt
              Lwt_unix.mkdir dir 0o700 >>
              Lwt_io.(with_file Output (dir/"election.json") (fun oc ->
                write_line oc raw_election
              )) >>
              Lwt_io.(with_file Output (dir/"public_keys.jsons") (fun oc ->
                write_lines oc public_keys
              )) >>
              let election = do_register () in
              let module W = (val election : WEB_ELECTION) in
              let () =
                Ocsigen_messages.debug (fun () ->
                  Printf.sprintf "Injecting credentials for %s" uuid
                )
              in
363
              public_creds |>
364 365 366 367 368 369 370 371 372 373 374 375 376 377 378
              Lwt_stream.iter_s W.B.inject_cred >>
              W.B.update_files () >>
              Ocsipersist.add election_ptable uuid (raw_election, web_params) >>
              let () = Lwt_mutex.unlock registration_mutex in
              return election
            with e ->
              Lwt_mutex.unlock registration_mutex;
              Lwt.fail e
        end in
        (* until here, no side-effects on the running server *)
        return @@ Some (module R : REGISTRABLE_ELECTION)
      )
    with e ->
      Lwt_mutex.unlock registration_mutex;
      Lwt.fail e
379 380 381 382

  lwt () =
    Ocsipersist.iter_step (fun uuid (raw_election, web_params) ->
      let params = Group.election_params_of_string raw_election in
383 384
      let _, do_register = register_election params web_params in
      let election = do_register () in
385 386 387 388 389 390 391 392
      let module W = (val election : WEB_ELECTION) in
      assert (uuid = Uuidm.to_string W.election.e_params.e_uuid);
      Ocsigen_messages.debug (fun () ->
        Printf.sprintf "Initialized election %s from persistent store" uuid
      );
      return ()
    ) election_ptable

393
  let () = let module X : EMPTY = Auth.Register (S) (T.Login (S)) in ()
Stephane Glondu's avatar
Stephane Glondu committed
394 395 396

  let () = Any.register ~service:home
    (fun () () ->
Stephane Glondu's avatar
Stephane Glondu committed
397
      Eliom_reference.unset cont >>
398
      match_lwt Ocsipersist.get main_election with
Stephane Glondu's avatar
Stephane Glondu committed
399
      | None ->
400 401 402 403 404 405 406 407 408 409
        lwt featured =
          Ocsipersist.get featured >>=
          Lwt_list.map_p (fun x ->
            let module W = (val SMap.find x !election_table : WEB_ELECTION) in
            return (module W : WEB_ELECTION_RO)
          )
        in
        T.home ~featured () >>= Html5.send
      | Some x ->
        let module W = (val SMap.find x !election_table : WEB_ELECTION) in
Stephane Glondu's avatar
Stephane Glondu committed
410 411 412
        Redirection.send W.S.home
    )

413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432
  let () = Html5.register ~service:admin
    (fun () () ->
      let cont () () = Redirection.send admin in
      Eliom_reference.set S.cont cont >>
      lwt elections =
        match_lwt get_user () with
        | None -> return []
        | Some u ->
          SMap.fold (fun _ w accu ->
            let module W = (val w : WEB_ELECTION) in
            if W.metadata.e_owner = Some u then (
              (module W : WEB_ELECTION_RO) :: accu
            ) else (
              accu
            )
          ) !election_table [] |> List.rev |> return
      in
      T.admin ~elections ()
    )

Stephane Glondu's avatar
Stephane Glondu committed
433 434 435
  let () = File.register
    ~service:source_code
    ~content_type:"application/x-gzip"
436
    (fun () () -> return C.source_file)
Stephane Glondu's avatar
Stephane Glondu committed
437

Stephane Glondu's avatar
Stephane Glondu committed
438 439
  let do_get_randomness =
    let prng = Lazy.lazy_from_fun (Lwt_preemptive.detach (fun () ->
440
      pseudo_rng (random_string secure_rng 16)
Stephane Glondu's avatar
Stephane Glondu committed
441 442 443 444 445
    )) in
    let mutex = Lwt_mutex.create () in
    fun () ->
      Lwt_mutex.with_lock mutex (fun () ->
        lwt prng = Lazy.force prng in
446
        return (random_string prng 32)
Stephane Glondu's avatar
Stephane Glondu committed
447 448
      )

Stephane Glondu's avatar
Stephane Glondu committed
449 450 451 452
  let () = String.register
    ~service:get_randomness
    (fun () () ->
      lwt r = do_get_randomness () in
453
      b64_encode_compact r |>
Stephane Glondu's avatar
Stephane Glondu committed
454 455 456
      (fun x -> string_of_randomness { randomness=x }) |>
      (fun x -> return (x, "application/json"))
    )
Stephane Glondu's avatar
Stephane Glondu committed
457

458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
  let () = Html5.register ~service:new_election
    (fun () () ->
      match_lwt S.get_user () with
      | None -> forbidden ()
      | Some _ -> T.new_election ()
    )

  let () = Any.register ~service:new_election_post
    (fun () (election, (metadata, (public_keys, public_creds))) ->
      match_lwt S.get_user () with
      | Some u ->
        let open Ocsigen_extensions in
        let files = {
          f_election = election.tmp_filename;
          f_metadata = metadata.tmp_filename;
          f_public_keys = public_keys.tmp_filename;
          f_public_creds = public_creds.tmp_filename;
        } in
        begin try_lwt
          begin match_lwt S.import_election files with
          | None ->
            T.new_election_failure `Exists () >>= Html5.send
          | Some w ->
            let module W = (val w : REGISTRABLE_ELECTION) in
            lwt w = W.register () in
            let module W = (val w : WEB_ELECTION) in
            W.S.admin |> Redirection.send
          end
        with e ->
          T.new_election_failure (`Exception e) () >>= Html5.send
        end
      | None -> forbidden ()
    )

492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
  let generate_uuid = Uuidm.v4_gen (Random.State.make_self_init ())

  let () = Html5.register ~service:election_setup_index
    (fun () () ->
     match_lwt S.get_user () with
     | Some u ->
        lwt uuids =
          Ocsipersist.fold_step (fun k v accu ->
            if v.se_owner = u
            then return (uuid_of_string k :: accu)
            else return accu
          ) election_stable []
        in T.election_setup_index uuids ()
     | None -> forbidden ()
    )

  let () = Redirection.register ~service:election_setup_new
    (fun () () ->
     match_lwt S.get_user () with
     | Some u ->
        let uuid = generate_uuid () in
        let uuid_s = Uuidm.to_string uuid in
        lwt token = generate_token () in
        let se_metadata = {
          e_voting_starts_at = None;
          e_voting_ends_at = None;
          e_readers = Some `Any;
          e_voters = Some `Any;
          e_owner = Some u;
          e_auth_config = Some [{auth_system = "dummy"; auth_instance = "demo"; auth_config = []}];
        } in
        let question = {
          q_answers = [| "Answer 1"; "Answer 2" |];
          q_min = 0;
          q_max = 1;
          q_question = "Question 1?";
        } in
        let se_questions = {
          t_description = "Description of the election.";
          t_name = "Name of the election";
          t_questions = [| question |];
          t_short_name = "short_name";
        } in
        let se = {
          se_owner = u;
          se_group = "{\"g\":\"14887492224963187634282421537186040801304008017743492304481737382571933937568724473847106029915040150784031882206090286938661464458896494215273989547889201144857352611058572236578734319505128042602372864570426550855201448111746579871811249114781674309062693442442368697449970648232621880001709535143047913661432883287150003429802392229361583608686643243349727791976247247948618930423866180410558458272606627111270040091203073580238905303994472202930783207472394578498507764703191288249547659899997131166130259700604433891232298182348403175947450284433411265966789131024573629546048637848902243503970966798589660808533\",\"p\":\"16328632084933010002384055033805457329601614771185955389739167309086214800406465799038583634953752941675645562182498120750264980492381375579367675648771293800310370964745767014243638518442553823973482995267304044326777047662957480269391322789378384619428596446446984694306187644767462460965622580087564339212631775817895958409016676398975671266179637898557687317076177218843233150695157881061257053019133078545928983562221396313169622475509818442661047018436264806901023966236718367204710755935899013750306107738002364137917426595737403871114187750804346564731250609196846638183903982387884578266136503697493474682071\",\"q\":\"61329566248342901292543872769978950870633559608669337131139375508370458778917\"}";
          se_questions;
          se_public_keys = [];
          se_metadata;
          se_public_creds = token;
        } in
        lwt () = Ocsipersist.add election_stable uuid_s se in
        lwt () = Ocsipersist.add election_credtokens token uuid_s in
        return (preapply election_setup uuid)
    | None -> forbidden ()
    )

  let () = Html5.register ~service:election_setup
    (fun uuid () ->
     match_lwt S.get_user () with
     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
        lwt se = Ocsipersist.find election_stable uuid_s in
        if se.se_owner = u
        then T.election_setup uuid se ()
        else forbidden ()
     | None -> forbidden ()
    )

  let election_setup_mutex = Lwt_mutex.create ()

  let handle_setup f uuid x =
    match_lwt S.get_user () with
    | Some u ->
       let uuid_s = Uuidm.to_string uuid in
       Lwt_mutex.with_lock election_setup_mutex (fun () ->
         lwt se = Ocsipersist.find election_stable uuid_s in
         if se.se_owner = u then (
           try_lwt
             f se x u;
             Ocsipersist.add election_stable uuid_s se >>
             Redirection.send (preapply election_setup uuid)
           with e ->
             T.generic_error_page (Printexc.to_string e) () >>= Html5.send
         ) else forbidden ()
       )
    | None -> forbidden ()

  let () =
    Any.register
      ~service:election_setup_group
      (handle_setup
         (fun se x _ ->
          let _group = Group.of_string x in
          (* we keep it as a string since it contains a type *)
          se.se_group <- x))

  let () =
    Any.register
      ~service:election_setup_metadata
      (handle_setup
         (fun se x u ->
          let metadata = metadata_of_string x in
          if metadata.e_owner <> Some u then failwith "wrong owner";
          se.se_metadata <- metadata))

  let () =
    Any.register
      ~service:election_setup_questions
      (handle_setup
         (fun se x _ ->
          se.se_questions <- template_of_string x))

  let () =
    Redirection.register
      ~service:election_setup_trustee_add
      (fun uuid () ->
       match_lwt S.get_user () with
       | Some u ->
          let uuid_s = Uuidm.to_string uuid in
          Lwt_mutex.with_lock election_setup_mutex (fun () ->
            lwt se = Ocsipersist.find election_stable uuid_s in
            if se.se_owner = u
            then (
              lwt token = generate_token () in
              se.se_public_keys <- (token, ref "") :: se.se_public_keys;
              Ocsipersist.add election_stable uuid_s se >>
              Ocsipersist.add election_pktokens token uuid_s
            ) else forbidden ()
          ) >>
          return (preapply election_setup uuid)
       | None -> forbidden ()
      )

  let () =
    Html5.register
      ~service:election_setup_credentials
      (fun token () ->
       lwt uuid = Ocsipersist.find election_credtokens token in
       lwt se = Ocsipersist.find election_stable uuid in
       T.election_setup_credentials token uuid se ()
      )

  let () =
    File.register
      ~service:election_setup_credentials_download
      ~content_type:"text/plain"
      (fun token () ->
       lwt uuid = Ocsipersist.find election_credtokens token in
       return (C.spool_dir / uuid ^ ".public_creds.txt")
      )

  let wrap_handler f =
    try_lwt f ()
    with
    | e -> T.generic_error_page (Printexc.to_string e) () >>= Html5.send

  let handle_credentials_post token creds =
    lwt uuid = Ocsipersist.find election_credtokens token in
    lwt se = Ocsipersist.find election_stable uuid in
    let module G = (val Group.of_string se.se_group : GROUP) in
    let fname = C.spool_dir / uuid ^ ".public_creds.txt" in
    Lwt_mutex.with_lock
      election_setup_mutex
      (fun () ->
       Lwt_io.with_file
         ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
         ~perm:0o600 ~mode:Lwt_io.Output fname
         (fun oc -> Lwt_io.write_chars oc creds)
      ) >>
    lwt () =
      let i = ref 1 in
      Lwt_stream.iter
        (fun x ->
         try
           let x = G.of_string x in
           if not (G.check x) then raise Exit;
           incr i
         with _ ->
           Printf.ksprintf failwith "invalid credential at line %d" !i)
        (Lwt_io.lines_of_file fname)
    in
    Redirection.send (preapply election_setup_credentials token)

  let () =
    Any.register
      ~service:election_setup_credentials_post
      (fun token creds ->
       let s = Lwt_stream.of_string creds in
       wrap_handler (fun () -> handle_credentials_post token s))

  let () =
    Any.register
      ~service:election_setup_credentials_post_file
      (fun token creds ->
       let s = Lwt_io.chars_of_file creds.Ocsigen_extensions.tmp_filename in
       wrap_handler (fun () -> handle_credentials_post token s))

  let () =
    Html5.register
      ~service:election_setup_trustee
      (fun token () ->
       lwt uuid = Ocsipersist.find election_pktokens token in
       lwt se = Ocsipersist.find election_stable uuid in
       T.election_setup_trustee token uuid se ()
      )

  let () =
    Any.register
      ~service:election_setup_trustee_post
      (fun token public_key ->
       wrap_handler
         (fun () ->
          lwt uuid = Ocsipersist.find election_pktokens token in
          Lwt_mutex.with_lock
            election_setup_mutex
            (fun () ->
             lwt se = Ocsipersist.find election_stable uuid in
             let pkref = List.assoc token se.se_public_keys in
             let module G = (val Group.of_string se.se_group : GROUP) in
             let pk = trustee_public_key_of_string G.read public_key in
             let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
             if not (KG.check pk) then failwith "invalid public key";
             (* we keep pk as a string because of G.t *)
             pkref := public_key;
             Ocsipersist.add election_stable uuid se
            ) >> Redirection.send (preapply election_setup_trustee token)
         )
      )

  let () =
    Any.register
      ~service:election_setup_create
      (fun uuid () ->
       match_lwt S.get_user () with
       | None -> forbidden ()
       | Some u ->
          begin try_lwt
            let uuid_s = Uuidm.to_string uuid in
            Lwt_mutex.with_lock election_setup_mutex (fun () ->
              lwt se = Ocsipersist.find election_stable uuid_s in
              if se.se_owner <> u then forbidden () else
              let group = Group.of_string se.se_group in
              let module G = (val group : GROUP) in
              let module M = Election.MakeSimpleMonad (G) in
              (* FIXME: KG does not actually need M here *)
              let module KG = Election.MakeSimpleDistKeyGen (G) (M) in
              (* construct election data in memory *)
              let () =
                match se.se_public_keys with
                | [] -> failwith "trustee public keys are missing"
                | _ :: _ -> ()
              in
              let public_keys =
                List.map
                  (fun (_, r) ->
                   if !r = "" then failwith "some public keys are missing";
                   trustee_public_key_of_string G.read !r
                  ) se.se_public_keys
              in
              let y = KG.combine (Array.of_list public_keys) in
              let template = se.se_questions in
              let params = {
                e_description = template.t_description;
                e_name = template.t_name;
                e_public_key = G.wrap_pubkey y;
                e_questions = template.t_questions;
                e_uuid = uuid;
                e_short_name = template.t_short_name;
              } in
              let files = {
                f_election = C.spool_dir / uuid_s ^ ".election.json";
                f_metadata = C.spool_dir / uuid_s ^ ".metadata.json";
                f_public_keys = C.spool_dir / uuid_s ^ ".public_keys.jsons";
                f_public_creds = C.spool_dir / uuid_s ^ ".public_creds.txt";
              } in
              lwt _ =
                try_lwt Lwt_unix.stat files.f_public_creds
                with _ -> failwith "public credentials are missing"
              in
              (* write election files to disk *)
              let create_file fname what =
                Lwt_io.with_file
                  ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
                  ~perm:0o600 ~mode:Lwt_io.Output fname
                  (fun oc -> Lwt_io.write oc what >> Lwt_io.write oc "\n")
              in
              create_file files.f_election (string_of_params G.write_wrapped_pubkey params) >>
              create_file files.f_metadata (string_of_metadata se.se_metadata) >>
              Lwt_io.with_file
                ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
                ~perm:0o600
                ~mode:Lwt_io.Output
                files.f_public_keys
                (fun oc ->
                 Lwt_list.iter_s
                   (fun pk ->
                    Lwt_io.write oc (string_of_trustee_public_key G.write pk) >>
                    Lwt_io.write oc "\n"
                   ) public_keys
                ) >>
              (* actually create the election *)
              begin match_lwt S.import_election files with
              | None ->
                 T.new_election_failure `Exists () >>= Html5.send
              | Some w ->
                 let module W = (val w : REGISTRABLE_ELECTION) in
                 lwt w = W.register () in
                 let module W = (val w : WEB_ELECTION) in
                 (* clean up temporary files *)
                 Lwt_unix.unlink files.f_election >>
                 Lwt_unix.unlink files.f_metadata >>
                 Lwt_unix.unlink files.f_public_keys >>
                 Lwt_unix.unlink files.f_public_creds >>
                 (* clean up tokens *)
                 Ocsipersist.remove election_credtokens se.se_public_creds >>
                 Lwt_list.iter_s
                   (fun (token, _) ->
                    Ocsipersist.remove election_pktokens token)
                   se.se_public_keys >>
                 Ocsipersist.remove election_stable uuid_s >>
                 Redirection.send W.S.admin
              end
            )
          with e ->
            T.new_election_failure (`Exception e) () >>= Html5.send
          end
      )

Stephane Glondu's avatar
Stephane Glondu committed
821
end