web_site.ml 52.2 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
30
open Web_services
Stephane Glondu's avatar
Stephane Glondu committed
31

32
let source_file = ref "belenios.tar.gz"
Stephane Glondu's avatar
Stephane Glondu committed
33

34 35 36 37 38 39 40 41 42 43 44 45
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
    )

46 47
let ( / ) = Filename.concat

48 49 50 51 52 53 54 55
let delete_shallow_directory dir =
  lwt () =
    Lwt_unix.files_of_directory dir |>
    Lwt_stream.filter (fun x -> x <> "." && x <> "..") |>
    Lwt_stream.iter_s (fun x -> Lwt_unix.unlink (dir/x))
  in
  Lwt_unix.rmdir dir

Stephane Glondu's avatar
Stephane Glondu committed
56
module PString = String
Stephane Glondu's avatar
Stephane Glondu committed
57

Stephane Glondu's avatar
Stephane Glondu committed
58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73
open Eliom_service
open Eliom_registration

module LwtRandom = MakeLwtRandom (struct let rng = make_rng () end)

(* Table with elections in setup mode. *)
let election_stable = Ocsipersist.open_table "site_setup"

(* Table with tokens given to trustees. *)
let election_pktokens = Ocsipersist.open_table "site_pktokens"

(* Table with tokens given to credential authorities. *)
let election_credtokens = Ocsipersist.open_table "site_credtokens"

module T = Web_templates

74 75
let web_election_data (raw_election, web_params) =
  let params = Group.election_params_of_string raw_election in
Stephane Glondu's avatar
Stephane Glondu committed
76
  let module D = struct
Stephane Glondu's avatar
Stephane Glondu committed
77
    include (val params : ELECTION_DATA)
78
    include (val web_params : WEB_PARAMS)
Stephane Glondu's avatar
Stephane Glondu committed
79
  end in
80 81
  (module D : WEB_ELECTION_DATA)

Stephane Glondu's avatar
Stephane Glondu committed
82
let raw_find_election uuid =
83 84 85 86 87 88 89 90 91 92 93
  lwt raw_election = Web_persist.get_raw_election uuid in
  lwt metadata = Web_persist.get_election_metadata uuid in
  match raw_election, metadata with
  | Some raw_election, Some metadata ->
     let module P = struct
       let dir = !spool_dir / uuid
       let metadata = metadata
     end in
     let web_params = (module P : WEB_PARAMS) in
     return (web_election_data (raw_election, web_params))
  | _, _ -> Lwt.fail Not_found
Stephane Glondu's avatar
Stephane Glondu committed
94

Stephane Glondu's avatar
Stephane Glondu committed
95 96 97 98 99 100 101 102 103 104 105
module WCacheTypes = struct
  type key = string
  type value = (module WEB_ELECTION_DATA)
end

module WCache = Ocsigen_cache.Make (WCacheTypes)

let find_election =
  let cache = new WCache.cache raw_find_election 100 in
  fun x -> cache#find x

Stephane Glondu's avatar
Stephane Glondu committed
106
let dump_passwords dir table =
Stephane Glondu's avatar
Stephane Glondu committed
107 108 109 110 111 112
  Lwt_io.(with_file Output (dir / "passwords.csv") (fun oc ->
    Ocsipersist.iter_step (fun voter (salt, hashed) ->
      write_line oc (voter ^ "," ^ salt ^ "," ^ hashed)
    ) table
  ))

Stephane Glondu's avatar
Stephane Glondu committed
113 114 115
(* Mutex to avoid simultaneous registrations of the same election *)
let registration_mutex = Lwt_mutex.create ()

116
let import_election f se_voters =
Stephane Glondu's avatar
Stephane Glondu committed
117 118 119 120 121 122 123 124 125
  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
        failwith "election.json must contain a single line"
126
      )
Stephane Glondu's avatar
Stephane Glondu committed
127 128
    in
    let params = Group.election_params_of_string raw_election in
Stephane Glondu's avatar
Stephane Glondu committed
129 130
    let module P = (val params : ELECTION_DATA) in
    let uuid = Uuidm.to_string P.election.e_params.e_uuid in
Stephane Glondu's avatar
Stephane Glondu committed
131
    lwt exists =
Stephane Glondu's avatar
Stephane Glondu committed
132 133 134 135
      lwt x = Web_persist.get_raw_election uuid in
      match x with
      | Some _ -> return true
      | None -> return false
Stephane Glondu's avatar
Stephane Glondu committed
136 137 138 139 140 141 142 143 144 145 146 147 148 149
    in
    if exists then (
      Lwt_mutex.unlock registration_mutex;
      return None
    ) else (
      let dir = !spool_dir/uuid in
      lwt metadata =
        Lwt_io.chars_of_file f.f_metadata |>
        Lwt_stream.to_string >>=
        wrap1 metadata_of_string
      in
      let module X = struct
        let metadata = metadata
        let dir = dir
150
      end in
Stephane Glondu's avatar
Stephane Glondu committed
151
      let web_params = (module X : WEB_PARAMS) in
152
      let module G = P.G in
Stephane Glondu's avatar
Stephane Glondu committed
153 154
      let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
      let public_keys = Lwt_io.lines_of_file f.f_public_keys in
Stephane Glondu's avatar
Stephane Glondu committed
155
      let voters = Lwt_io.lines_of_file f.f_voters in
156 157 158 159 160
      lwt () =
        match_lwt Lwt_stream.peek voters with
        | Some _ -> return_unit
        | None -> Lwt.fail (Failure "No voters")
      in
161 162
      lwt () =
        match metadata.e_auth_config with
163 164 165 166 167
        | Some [{auth_system = "password"; _}] ->
           if List.for_all (fun v -> v.sv_password <> None) se_voters then
             return_unit
           else
             Lwt.fail (Failure "Some passwords are missing")
168 169
        | _ -> return_unit
      in
Stephane Glondu's avatar
Stephane Glondu committed
170 171 172 173 174 175 176
      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.";
Stephane Glondu's avatar
Stephane Glondu committed
177
      if not G.(P.election.e_params.e_public_key =~ KG.combine pks) then
Stephane Glondu's avatar
Stephane Glondu committed
178 179 180 181 182 183 184 185
        failwith "Public keys mismatch with election public key.";
      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 ()
186
        )
Stephane Glondu's avatar
Stephane Glondu committed
187 188 189 190 191 192 193 194 195 196 197
      ) in
      let module R = struct
        let register () =
          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
            )) >>
Stephane Glondu's avatar
Stephane Glondu committed
198 199 200
            Lwt_io.(with_file Output (dir/"voters.txt") (fun oc ->
              write_lines oc voters
            )) >>
201 202 203
            Lwt_io.(with_file Output (dir/"metadata.json") (fun oc ->
              write_line oc (string_of_metadata metadata)
            )) >>
204 205
            let election = web_election_data (raw_election, web_params) in
            let module W = Web_election.Make ((val election)) (LwtRandom) in
206
            lwt () =
207
              match W.D.metadata.e_auth_config with
208 209 210 211 212 213 214 215 216
              | None -> return ()
              | Some xs ->
                 let auth_config =
                   List.map (fun {auth_system; auth_instance; auth_config} ->
                     auth_instance, (auth_system, List.map snd auth_config)
                   ) xs
                 in
                 Web_persist.set_auth_config uuid auth_config
            in
Stephane Glondu's avatar
Stephane Glondu committed
217
            let () =
Stephane Glondu's avatar
Stephane Glondu committed
218
              Ocsigen_messages.console (fun () ->
Stephane Glondu's avatar
Stephane Glondu committed
219 220 221 222 223 224 225
                Printf.sprintf "Injecting credentials for %s" uuid
              )
            in
            public_creds |>
            Lwt_stream.iter_s W.B.inject_cred >>
            W.B.update_files () >>
            let () = Lwt_mutex.unlock registration_mutex in
226
            return (module W : WEB_ELECTION)
Stephane Glondu's avatar
Stephane Glondu committed
227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
          with e ->
            lwt () =
              try_lwt delete_shallow_directory dir
              with e ->
                Printf.ksprintf
                  (fun s ->
                   return (Ocsigen_messages.unexpected_exception e s))
                  "error while deleting %s after failure of %s"
                  dir uuid
            in
            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)
Stephane Glondu's avatar
Stephane Glondu committed
242
    )
Stephane Glondu's avatar
Stephane Glondu committed
243 244 245 246 247 248
  with e ->
    Lwt_mutex.unlock registration_mutex;
    Lwt.fail e

let () = Any.register ~service:home
  (fun () () ->
Stephane Glondu's avatar
Stephane Glondu committed
249
    Eliom_reference.unset Web_auth_state.cont >>
250
    T.home () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
251 252 253 254
  )

let () = Html5.register ~service:admin
  (fun () () ->
Stephane Glondu's avatar
Stephane Glondu committed
255 256 257
    let cont () = Redirection.send admin in
    Eliom_reference.set Web_auth_state.cont [cont] >>
    lwt site_user = Web_auth_state.get_site_user () in
Stephane Glondu's avatar
Stephane Glondu committed
258
    lwt elections =
259
      match site_user with
260
      | None -> return None
Stephane Glondu's avatar
Stephane Glondu committed
261
      | Some u ->
262
         lwt elections, tallied =
Stephane Glondu's avatar
Stephane Glondu committed
263 264
           Web_persist.get_elections_by_owner u >>=
           Lwt_list.fold_left_s (fun accu uuid_s ->
265
               lwt w = find_election uuid_s in
266
               lwt state = Web_persist.get_election_state uuid_s in
267
               lwt date = Web_persist.get_election_date uuid_s in
268
               let elections, tallied = accu in
269
               match state with
270 271
               | `Tallied _ -> return (elections, (date, w) :: tallied)
               | _ -> return ((date, w) :: elections, tallied)
Stephane Glondu's avatar
Stephane Glondu committed
272
           ) ([], [])
273 274 275
         and setup_elections =
           Ocsipersist.fold_step (fun k v accu ->
             if v.se_owner = u
276
             then return ((uuid_of_string k, v.se_questions.t_name) :: accu)
277 278
             else return accu
           ) election_stable []
279 280 281 282 283 284 285
         in
         let sort l =
           List.sort (fun (x, _) (y, _) -> datetime_compare x y) l |>
           List.map (fun (_, x) -> x)
         in
         let elections = sort elections and tallied = sort tallied in
         return @@ Some (elections, tallied, setup_elections)
Stephane Glondu's avatar
Stephane Glondu committed
286
    in
287
    T.admin ~elections ()
Stephane Glondu's avatar
Stephane Glondu committed
288 289 290 291 292 293 294 295
  )

let () = File.register
  ~service:source_code
  ~content_type:"application/x-gzip"
  (fun () () -> return !source_file)

let do_get_randomness =
296
  let prng = Lazy.from_fun (Lwt_preemptive.detach (fun () ->
Stephane Glondu's avatar
Stephane Glondu committed
297 298 299 300 301 302 303
    pseudo_rng (random_string secure_rng 16)
  )) in
  let mutex = Lwt_mutex.create () in
  fun () ->
    Lwt_mutex.with_lock mutex (fun () ->
      lwt prng = Lazy.force prng in
      return (random_string prng 32)
304 305
    )

Stephane Glondu's avatar
Stephane Glondu committed
306 307 308 309 310 311 312 313 314 315 316
let () = String.register
  ~service:get_randomness
  (fun () () ->
    lwt r = do_get_randomness () in
    b64_encode_compact r |>
    (fun x -> string_of_randomness { randomness=x }) |>
    (fun x -> return (x, "application/json"))
  )

let generate_uuid = Uuidm.v4_gen (Random.State.make_self_init ())

Stephane Glondu's avatar
Stephane Glondu committed
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
let create_new_election owner cred auth =
  let e_cred_authority = match cred with
    | `Automatic -> Some "server"
    | `Manual -> None
  in
  let e_auth_config = match auth with
    | `Password -> Some [{auth_system = "password"; auth_instance = "password"; auth_config = []}]
    | `Dummy -> Some [{auth_system = "dummy"; auth_instance = "dummy"; auth_config = []}]
    | `CAS server -> Some [{auth_system = "cas"; auth_instance = "cas"; auth_config = ["server", server]}]
  in
  let uuid = generate_uuid () in
  let uuid_s = Uuidm.to_string uuid in
  lwt token = generate_token () in
  let se_metadata = {
    e_owner = Some owner;
    e_auth_config;
    e_cred_authority;
  } in
  let question = {
    q_answers = [| "Answer 1"; "Answer 2"; "Blank" |];
    q_min = 1;
    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 = owner;
    se_group = "{\"g\":\"14887492224963187634282421537186040801304008017743492304481737382571933937568724473847106029915040150784031882206090286938661464458896494215273989547889201144857352611058572236578734319505128042602372864570426550855201448111746579871811249114781674309062693442442368697449970648232621880001709535143047913661432883287150003429802392229361583608686643243349727791976247247948618930423866180410558458272606627111270040091203073580238905303994472202930783207472394578498507764703191288249547659899997131166130259700604433891232298182348403175947450284433411265966789131024573629546048637848902243503970966798589660808533\",\"p\":\"16328632084933010002384055033805457329601614771185955389739167309086214800406465799038583634953752941675645562182498120750264980492381375579367675648771293800310370964745767014243638518442553823973482995267304044326777047662957480269391322789378384619428596446446984694306187644767462460965622580087564339212631775817895958409016676398975671266179637898557687317076177218843233150695157881061257053019133078545928983562221396313169622475509818442661047018436264806901023966236718367204710755935899013750306107738002364137917426595737403871114187750804346564731250609196846638183903982387884578266136503697493474682071\",\"q\":\"61329566248342901292543872769978950870633559608669337131139375508370458778917\"}";
    se_voters = [];
    se_questions;
    se_public_keys = [];
    se_metadata;
    se_public_creds = token;
355
    se_public_creds_received = false;
Stephane Glondu's avatar
Stephane Glondu committed
356 357 358 359 360 361 362 363
  } in
  lwt () = Ocsipersist.add election_stable uuid_s se in
  lwt () = Ocsipersist.add election_credtokens token uuid_s in
  return (preapply election_setup uuid)

let () = Html5.register ~service:election_setup_pre
  (fun () () -> T.election_setup_pre ())

Stephane Glondu's avatar
Stephane Glondu committed
364
let () = Redirection.register ~service:election_setup_new
Stephane Glondu's avatar
Stephane Glondu committed
365
  (fun () (credmgmt, (auth, cas_server)) ->
Stephane Glondu's avatar
Stephane Glondu committed
366
   match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
367
   | Some u ->
Stephane Glondu's avatar
Stephane Glondu committed
368 369 370 371 372 373 374 375 376 377 378 379 380
      lwt credmgmt = match credmgmt with
        | Some "auto" -> return `Automatic
        | Some "manual" -> return `Manual
        | _ -> fail_http 400
      in
      lwt auth = match auth with
        | Some "password" -> return `Password
        | Some "dummy" -> return `Dummy
        | Some "cas" -> return @@ `CAS cas_server
        | _ -> fail_http 400
      in
      create_new_election u credmgmt auth
   | None -> forbidden ())
Stephane Glondu's avatar
Stephane Glondu committed
381

382 383 384 385 386 387 388 389 390 391
let generic_setup_page f uuid () =
  match_lwt Web_auth_state.get_site_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 f uuid se ()
     else forbidden ()
  | None -> forbidden ()

Stephane Glondu's avatar
Stephane Glondu committed
392
let () = Html5.register ~service:election_setup
393
  (generic_setup_page T.election_setup)
Stephane Glondu's avatar
Stephane Glondu committed
394

395
let () = Html5.register ~service:election_setup_trustees
396 397 398 399
  (generic_setup_page T.election_setup_trustees)

let () = Html5.register ~service:election_setup_credential_authority
  (generic_setup_page T.election_setup_credential_authority)
400

Stephane Glondu's avatar
Stephane Glondu committed
401 402
let election_setup_mutex = Lwt_mutex.create ()

403
let handle_setup f uuid x =
Stephane Glondu's avatar
Stephane Glondu committed
404
  match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
405 406 407 408 409 410
  | 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
411
           lwt cont = f se x u uuid in
Stephane Glondu's avatar
Stephane Glondu committed
412
           Ocsipersist.add election_stable uuid_s se >>
413
           cont ()
Stephane Glondu's avatar
Stephane Glondu committed
414
         with e ->
415
           T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
416 417 418
       ) else forbidden ()
     )
  | None -> forbidden ()
419

420 421
let redir_preapply s u () = Redirection.send (preapply s u)

422 423 424 425
let () =
  Any.register
    ~service:election_setup_description
    (handle_setup
426
       (fun se (name, description) _ uuid ->
427 428 429
         se.se_questions <- {se.se_questions with
           t_name = name;
           t_description = description;
430 431
         };
         return (redir_preapply election_setup uuid)))
432

Stephane Glondu's avatar
Stephane Glondu committed
433 434 435 436
let () =
  Any.register
    ~service:election_setup_group
    (handle_setup
437
       (fun se x _ uuid ->
Stephane Glondu's avatar
Stephane Glondu committed
438 439
        let _group = Group.of_string x in
        (* we keep it as a string since it contains a type *)
440 441
        se.se_group <- x;
        return (redir_preapply election_setup uuid)))
442

Stephane Glondu's avatar
Stephane Glondu committed
443 444 445 446
let () =
  Any.register
    ~service:election_setup_metadata
    (handle_setup
447
       (fun se x u uuid ->
Stephane Glondu's avatar
Stephane Glondu committed
448 449
        let metadata = metadata_of_string x in
        if metadata.e_owner <> Some u then failwith "wrong owner";
450 451
        se.se_metadata <- metadata;
        return (redir_preapply election_setup uuid)))
452

453 454 455 456
let () =
  Any.register
    ~service:election_setup_auth
    (handle_setup
457 458
       (fun se auth_system _ uuid ->
         (match auth_system with
459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477
         | Some (("dummy" | "password") as auth_system) ->
            se.se_metadata <- {
              se.se_metadata with
                e_auth_config = Some [{
                  auth_system;
                  auth_instance = auth_system;
                  auth_config = []
                }]
            }
         | Some "cas" ->
            se.se_metadata <- {
              se.se_metadata with
                e_auth_config = Some [{
                  auth_system = "cas";
                  auth_instance = "cas";
                  auth_config = ["server", ""];
                }]
            }
         | Some x -> failwith ("unknown authentication system: "^x)
478 479
         | None -> failwith "no authentication system was given");
         return (redir_preapply election_setup uuid)))
480 481 482 483 484

let () =
  Any.register
    ~service:election_setup_auth_cas
    (handle_setup
485
       (fun se server _ uuid ->
486 487 488 489 490 491 492
         se.se_metadata <- {
           se.se_metadata with
             e_auth_config = Some [{
               auth_system = "cas";
               auth_instance = "cas";
               auth_config = ["server", server];
             }]
493 494
         };
         return (redir_preapply election_setup uuid)))
495

496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517
let template_password = format_of_string
  "You are listed as a voter for the election

  %s

You will find below your login and password.  To cast a vote, you will
also need a credential, sent in a separate email.  Be careful,
passwords and credentials look similar but play different roles.  You
will be asked to enter your credential before entering the voting
booth.  Login and passwords are required once your ballot is ready to
be cast.

Username: %s
Password: %s
Page of the election: %s

Note that you are allowed to vote several times.  Only the last vote
counts.

-- 
Belenios"

518
let generate_password title url id =
519
  let email, login = split_identity id in
520 521 522
  lwt salt = generate_token () in
  lwt password = generate_token () in
  let hashed = sha256_hex (salt ^ password) in
523
  let body = Printf.sprintf template_password title login password url in
524
  let subject = "Your password for election " ^ title in
525 526
  send_email "noreply@belenios.org" email subject body >>
  return (salt, hashed)
527

528 529 530 531 532
let () =
  Any.register
    ~service:election_setup_auth_genpwd
    (handle_setup
       (fun se () _ uuid ->
533 534 535 536 537
         let title = se.se_questions.t_name in
         let url = Eliom_uri.make_string_uri
           ~absolute:true ~service:election_home
           (uuid, ()) |> rewrite_prefix
         in
538
         Lwt_list.iter_s (fun id ->
539 540 541 542 543
           match id.sv_password with
           | None ->
             lwt x = generate_password title url id.sv_id in
             return (id.sv_password <- Some x)
           | Some _ -> return_unit
544
         ) se.se_voters >>
545 546 547
         return (fun () ->
           T.generic_page ~title:"Success"
             "Passwords have been generated and mailed!" () >>= Html5.send)))
548

549 550 551
let () =
  Any.register
    ~service:election_regenpwd
Stephane Glondu's avatar
Stephane Glondu committed
552
    (fun (uuid, ()) () ->
553 554 555 556 557 558
      T.regenpwd uuid () >>= Html5.send)

let () =
  Any.register
    ~service:election_regenpwd_post
    (fun (uuid, ()) user ->
559
      let uuid_s = Uuidm.to_string uuid in
560 561
      lwt w = find_election uuid_s in
      let module W = (val w) in
562 563 564 565 566 567 568 569 570 571 572 573
      lwt site_user = Web_auth_state.get_site_user () in
      match site_user with
      | Some u when W.metadata.e_owner = Some u ->
         let table = "password_" ^ underscorize uuid_s in
         let table = Ocsipersist.open_table table in
         let title = W.election.e_params.e_name in
         let url = Eliom_uri.make_string_uri
           ~absolute:true ~service:election_home
           (uuid, ()) |> rewrite_prefix
         in
         begin try_lwt
           lwt _ = Ocsipersist.find table user in
574 575
           lwt x = generate_password title url user in
           Ocsipersist.add table user x >>
Stephane Glondu's avatar
Stephane Glondu committed
576
           dump_passwords W.dir table >>
577 578 579 580 581 582 583 584 585 586 587
           T.generic_page ~title:"Success"
             ("A new password has been mailed to " ^ user ^ ".") ()
           >>= Html5.send
         with Not_found ->
           T.generic_page ~title:"Error"
             (user ^ " is not a registered user for this election.") ()
           >>= Html5.send
         end
      | _ -> forbidden ()
    )

Stephane Glondu's avatar
Stephane Glondu committed
588 589 590 591
let () =
  Html5.register
    ~service:election_setup_questions
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
592
     match_lwt Web_auth_state.get_site_user () with
593 594
     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
Stephane Glondu's avatar
Stephane Glondu committed
595 596
        lwt se = Ocsipersist.find election_stable uuid_s in
        if se.se_owner = u
597
        then T.election_setup_questions uuid se ()
Stephane Glondu's avatar
Stephane Glondu committed
598 599
        else forbidden ()
     | None -> forbidden ()
600 601
    )

Stephane Glondu's avatar
Stephane Glondu committed
602 603 604 605
let () =
  Any.register
    ~service:election_setup_questions_post
    (handle_setup
606 607 608
       (fun se x _ uuid ->
        se.se_questions <- template_of_string x;
         return (redir_preapply election_setup_questions uuid)))
Stephane Glondu's avatar
Stephane Glondu committed
609

Stephane Glondu's avatar
Stephane Glondu committed
610 611 612 613
let () =
  Html5.register
    ~service:election_setup_voters
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
614
      match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
615 616 617 618
      | Some u ->
         let uuid_s = Uuidm.to_string uuid in
         lwt se = Ocsipersist.find election_stable uuid_s in
         if se.se_owner = u
619
         then T.election_setup_voters uuid se ()
Stephane Glondu's avatar
Stephane Glondu committed
620 621 622 623 624 625 626
         else forbidden ()
      | None -> forbidden ()
    )

(* see http://www.regular-expressions.info/email.html *)
let email_rex = Pcre.regexp
  ~flags:[`CASELESS]
627
  "^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,7}(,[A-Z0-9._%+-]+)?$"
Stephane Glondu's avatar
Stephane Glondu committed
628 629 630 631 632 633 634

let is_email x =
  try ignore (Pcre.pcre_exec ~rex:email_rex x); true
  with Not_found -> false

let () =
  Any.register
635
    ~service:election_setup_voters_add
Stephane Glondu's avatar
Stephane Glondu committed
636
    (handle_setup
637
       (fun se x _ uuid ->
638
         if se.se_public_creds_received then forbidden () else (
Stephane Glondu's avatar
Stephane Glondu committed
639 640 641 642 643 644 645
         let xs = Pcre.split x in
         let () =
           try
             let bad = List.find (fun x -> not (is_email x)) xs in
             Printf.ksprintf failwith "%S is not a valid address" bad
           with Not_found -> ()
         in
646
         se.se_voters <- se.se_voters @ List.map (fun sv_id ->
647
           {sv_id; sv_password = None}
648
         ) xs;
649
         return (redir_preapply election_setup_voters uuid))))
650 651 652 653 654 655

let () =
  Any.register
    ~service:election_setup_voters_remove
    (handle_setup
       (fun se voter _ uuid ->
656
         if se.se_public_creds_received then forbidden () else (
657 658 659
         se.se_voters <- List.filter (fun v ->
           v.sv_id <> voter
         ) se.se_voters;
660
         return (redir_preapply election_setup_voters uuid))))
Stephane Glondu's avatar
Stephane Glondu committed
661

Stephane Glondu's avatar
Stephane Glondu committed
662 663 664
let () =
  Redirection.register
    ~service:election_setup_trustee_add
665
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
666
     match_lwt Web_auth_state.get_site_user () with
667 668
     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
Stephane Glondu's avatar
Stephane Glondu committed
669 670 671 672 673 674 675 676 677 678
        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 ()
        ) >>
679
        return (preapply election_setup_trustees uuid)
680 681 682 683 684 685 686
     | None -> forbidden ()
    )

let () =
  Redirection.register
    ~service:election_setup_trustee_del
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
687
     match_lwt Web_auth_state.get_site_user () with
688 689 690 691 692 693 694 695 696 697 698 699 700 701
     | 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 (
            match se.se_public_keys with
            | (token, _) :: xs ->
               se.se_public_keys <- xs;
               Ocsipersist.add election_stable uuid_s se >>
               Ocsipersist.remove election_pktokens token
            | _ -> return ()
          ) else forbidden ()
        ) >>
702
        return (preapply election_setup_trustees uuid)
703 704 705
     | None -> forbidden ()
    )

Stephane Glondu's avatar
Stephane Glondu committed
706 707 708 709 710 711 712 713
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 ()
    )
714

Stephane Glondu's avatar
Stephane Glondu committed
715 716 717 718 719 720 721 722
let () =
  File.register
    ~service:election_setup_credentials_download
    ~content_type:"text/plain"
    (fun token () ->
     lwt uuid = Ocsipersist.find election_credtokens token in
     return (!spool_dir / uuid ^ ".public_creds.txt")
    )
723

Stephane Glondu's avatar
Stephane Glondu committed
724 725 726
let wrap_handler f =
  try_lwt f ()
  with
727
  | e -> T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
728 729 730 731

let handle_credentials_post token creds =
  lwt uuid = Ocsipersist.find election_credtokens token in
  lwt se = Ocsipersist.find election_stable uuid in
732
  if se.se_public_creds_received then forbidden () else
Stephane Glondu's avatar
Stephane Glondu committed
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
  let module G = (val Group.of_string se.se_group : GROUP) in
  let fname = !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
755
  let () = se.se_metadata <- {se.se_metadata with e_cred_authority = None} in
756 757
  let () = se.se_public_creds_received <- true in
  Ocsipersist.add election_stable uuid se >>
758 759
  T.generic_page ~title:"Success"
    "Credentials have been received and checked!" () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
760 761 762 763 764 765 766

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))
767

Stephane Glondu's avatar
Stephane Glondu committed
768 769 770 771 772 773 774
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))

775 776 777 778 779 780
module Credgen = struct
  module String = PString

  (* FIXME: duplicate of Tool_credgen *)

  let get_random_char =
781
    let prng = Lazy.from_fun (Lwt_preemptive.detach (fun () ->
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798
      pseudo_rng (random_string secure_rng 16)
    )) in
    let mutex = Lwt_mutex.create () in
    fun () ->
      Lwt_mutex.with_lock mutex (fun () ->
        lwt prng = Lazy.force prng in
        let s = random_string prng 1 in
        return @@ s.[0]
      )

  (* Beware: the following must be changed in accordance with the booth! *)
  let digits = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
  let token_length = 14
  let n58 = Z.of_int 58
  let n53 = Z.of_int 53

  let generate_raw_token () =
799
    let res = Bytes.create token_length in
800 801 802 803
    let rec loop i accu =
      if i < token_length then (
        lwt digit = get_random_char () in
        let digit = int_of_char digit mod 58 in
804
        Bytes.set res i digits.[digit];
805
        loop (i+1) Z.(n58 * accu + of_int digit)
806
      ) else return (Bytes.to_string res, accu)
807 808 809 810 811 812 813 814 815 816 817
    in loop 0 Z.zero

  let add_checksum (raw, value) =
    let checksum = 53 - Z.(to_int (value mod n53)) in
    return (raw ^ String.make 1 digits.[checksum])

  let generate () =
    generate_raw_token () >>= add_checksum

end

818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
let template_credential = format_of_string
  "You are listed as a voter for the election

  %s

You will find below your login and credential.  To cast a vote, you will
also need a password, sent in a separate email.  Be careful,
passwords and credentials look similar but play different roles.  You
will be asked to enter your credential before entering the voting
booth.  Login and passwords are required once your ballot is ready to
be cast.

Username: %s
Credential: %s
Page of the election: %s

Note that you are allowed to vote several times.  Only the last vote
counts.

-- 
Belenios"

840 841 842
let () =
  Any.register
    ~service:election_setup_credentials_server
843
    (handle_setup (fun se () _ uuid ->
844
      if se.se_public_creds_received then forbidden () else
845 846 847
      let () = se.se_metadata <- {se.se_metadata with
        e_cred_authority = Some "server"
      } in
848
      let uuid_s = Uuidm.to_string uuid in
849 850 851 852 853
      let title = se.se_questions.t_name in
      let url = Eliom_uri.make_string_uri
        ~absolute:true ~service:election_home
        (uuid, ()) |> rewrite_prefix
      in
854 855 856
      let module S = Set.Make (PString) in
      let module G = (val Group.of_string se.se_group : GROUP) in
      lwt creds =
857 858
        Lwt_list.fold_left_s (fun accu v ->
          let email, login = split_identity v.sv_id in
859 860 861 862 863 864 865
          lwt cred = Credgen.generate () in
          let priv_cred = derive_cred uuid cred in
          let pub_cred =
            let x = Z.(of_string_base 16 priv_cred mod G.q) in
            let y = G.(g **~ x) in
            G.to_string y
          in
866
          let body = Printf.sprintf template_credential title login cred url in
867
          let subject = "Your credential for election " ^ title in
868
          lwt () = send_email "noreply@belenios.org" email subject body in
869 870 871 872 873
          return @@ S.add pub_cred accu
        ) S.empty se.se_voters
      in
      let creds = S.elements creds in
      let fname = !spool_dir / uuid_s ^ ".public_creds.txt" in
874
      lwt () =
875 876 877 878
          Lwt_io.with_file
            ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
            ~perm:0o600 ~mode:Lwt_io.Output fname
            (fun oc ->
879
              Lwt_list.iter_s (Lwt_io.write_line oc) creds)
880
      in
881
      se.se_public_creds_received <- true;
882 883 884
      return (fun () ->
        T.generic_page ~title:"Success"
          "Credentials have been generated and mailed!" () >>= Html5.send)))
885

Stephane Glondu's avatar
Stephane Glondu committed
886 887 888 889 890 891
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
Stephane Glondu's avatar
Stephane Glondu committed
892
     T.election_setup_trustee token se ()
Stephane Glondu's avatar
Stephane Glondu committed
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
    )

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
914 915 916
          ) >> T.generic_page ~title:"Success"
            "Your key has been received and checked!"
            () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
917 918 919 920 921 922 923
       )
    )

let () =
  Any.register
    ~service:election_setup_create
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
924
     match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
925 926 927
     | None -> forbidden ()
     | Some u ->
        begin try_lwt
928 929 930
          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
Stephane Glondu's avatar
Stephane Glondu committed
931 932 933
            if se.se_owner <> u then forbidden () else
            let group = Group.of_string se.se_group in
            let module G = (val group : GROUP) in
934
            let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
Stephane Glondu's avatar
Stephane Glondu committed
935
            (* construct election data in memory *)
936
            lwt public_keys, private_key =
Stephane Glondu's avatar
Stephane Glondu committed
937
              match se.se_public_keys with
938 939 940 941 942 943 944 945 946
              | [] ->
                 lwt private_key, public_key = KG.generate_and_prove () in
                 return ([public_key], Some private_key)
              | _ :: _ ->
                 return (List.rev_map
                   (fun (_, r) ->
                     if !r = "" then failwith "some public keys are missing";
                     trustee_public_key_of_string G.read !r
                   ) se.se_public_keys, None)
Stephane Glondu's avatar
Stephane Glondu committed
947 948 949 950 951 952
            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;
953
              e_public_key = {wpk_group = G.group; wpk_y = y};
Stephane Glondu's avatar
Stephane Glondu committed
954 955 956 957 958 959 960 961 962
              e_questions = template.t_questions;
              e_uuid = uuid;
              e_short_name = template.t_short_name;
            } in
            let files = {
              f_election = !spool_dir / uuid_s ^ ".election.json";
              f_metadata = !spool_dir / uuid_s ^ ".metadata.json";
              f_public_keys = !spool_dir / uuid_s ^ ".public_keys.jsons";
              f_public_creds = !spool_dir / uuid_s ^ ".public_creds.txt";
Stephane Glondu's avatar
Stephane Glondu committed
963
              f_voters = !spool_dir / uuid_s ^ ".voters.txt";
Stephane Glondu's avatar
Stephane Glondu committed
964 965 966 967 968 969
            } in
            lwt _ =
              try_lwt Lwt_unix.stat files.f_public_creds
              with _ -> failwith "public credentials are missing"
            in
            (* write election files to disk *)
970
            let create_file fname what xs =
Stephane Glondu's avatar
Stephane Glondu committed
971 972 973
              Lwt_io.with_file
                ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
                ~perm:0o600 ~mode:Lwt_io.Output fname
974 975 976 977 978
                (fun oc ->
                  Lwt_list.iter_s
                    (fun v ->
                      Lwt_io.write oc (what v) >>
                      Lwt_io.write oc "\n") xs)
Stephane Glondu's avatar
Stephane Glondu committed
979
            in
980 981
            create_file files.f_election (string_of_params (write_wrapped_pubkey G.write_group G.write)) [params] >>
            create_file files.f_metadata string_of_metadata [se.se_metadata] >>
982
            create_file files.f_voters (fun x -> x.sv_id) se.se_voters >>
983
            create_file files.f_public_keys (string_of_trustee_public_key G.write) public_keys >>
Stephane Glondu's avatar
Stephane Glondu committed
984
            (* actually create the election *)
985
            begin match_lwt import_election files se.se_voters with
Stephane Glondu's avatar
Stephane Glondu committed
986
            | None ->
987
               T.new_election_failure `Exists () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
988 989 990 991
            | Some w ->
               let module W = (val w : REGISTRABLE_ELECTION) in
               lwt w = W.register () in
               let module W = (val w : WEB_ELECTION) in
992 993 994 995 996
               (* create file with private key, if any *)
               lwt () =
                 match private_key with
                 | None -> return ()
                 | Some x ->
997
                    let fname = W.D.dir / "private_key.json" in
998
                    create_file fname string_of_number [x]
999
               in
Stephane Glondu's avatar
Stephane Glondu committed
1000 1001 1002 1003 1004
               (* 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 >>
Stephane Glondu's avatar
Stephane Glondu committed
1005
               Lwt_unix.unlink files.f_voters >>
Stephane Glondu's avatar
Stephane Glondu committed
1006 1007 1008 1009 1010 1011 1012
               (* 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 >>
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027
               (* inject passwords *)
               (match se.se_metadata.e_auth_config with
               | Some [{auth_system = "password"; _}] ->
                 let table = "password_" ^ underscorize uuid_s in
                 let table = Ocsipersist.open_table table in
                 Lwt_list.iter_s
                   (fun v ->
                     let _, login = split_identity v.sv_id in
                     match v.sv_password with
                     | Some x -> Ocsipersist.add table login x
                     | None -> return_unit
                   ) se.se_voters >>
                 dump_passwords W.D.dir table
               | _ -> return_unit) >>
               (* finish *)
1028
               Web_persist.set_election_date uuid_s (now ()) >>
Stephane Glondu's avatar
Stephane Glondu committed
1029
               Redirection.send
1030
                 (preapply election_admin (W.D.election.e_params.e_uuid, ()))
Stephane Glondu's avatar
Stephane Glondu committed
1031 1032 1033
            end
          )
        with e ->
1034
          T.new_election_failure (`Exception e) () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
1035 1036
        end
    )
1037

Stephane Glondu's avatar
Stephane Glondu committed
1038 1039 1040 1041
let () =
  Any.register
    ~service:election_home
    (fun (uuid, ()) () ->
1042
      let uuid_s = Uuidm.to_string uuid in
1043 1044 1045
      try_lwt
        lwt w = find_election uuid_s in
        let module W = (val w) in
1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
        Eliom_reference.unset Web_services.ballot >>
        let cont () =
          Redirection.send
            (Eliom_service.preapply
               election_home (W.election.e_params.e_uuid, ()))
        in
        Eliom_reference.set Web_auth_state.cont [cont] >>
        match_lwt Eliom_reference.get Web_services.cast_confirmed with
        | Some result ->
           Eliom_reference.unset Web_services.cast_confirmed >>
           T.cast_confirmed (module W) ~result () >>= Html5.send
        | None ->
           lwt state = Web_persist.get_election_state uuid_s in
           T.election_home (module W) state () >>= Html5.send
      with N