web_site.ml 50.3 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
106 107 108 109 110 111 112
let dump_passwords dir table uuid =
  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 =
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
161 162 163 164 165 166 167 168 169 170 171 172
      lwt () =
        match metadata.e_auth_config with
        | Some [x] ->
           if x.auth_system = "password" then
             let table = "password_" ^ underscorize uuid in
             let table = Ocsipersist.open_table table in
             lwt n = Ocsipersist.length table in
             if n = 0 then Lwt.fail (Failure "No passwords")
             else return_unit
           else return_unit
        | _ -> return_unit
      in
Stephane Glondu's avatar
Stephane Glondu committed
173 174 175 176 177 178 179
      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
180
      if not G.(P.election.e_params.e_public_key =~ KG.combine pks) then
Stephane Glondu's avatar
Stephane Glondu committed
181 182 183 184 185 186 187 188
        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 ()
189
        )
Stephane Glondu's avatar
Stephane Glondu committed
190 191 192 193 194 195 196 197 198 199 200
      ) 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
201 202 203
            Lwt_io.(with_file Output (dir/"voters.txt") (fun oc ->
              write_lines oc voters
            )) >>
204 205 206
            Lwt_io.(with_file Output (dir/"metadata.json") (fun oc ->
              write_line oc (string_of_metadata metadata)
            )) >>
207 208
            let election = web_election_data (raw_election, web_params) in
            let module W = Web_election.Make ((val election)) (LwtRandom) in
209
            lwt () =
210
              match W.D.metadata.e_auth_config with
211 212 213 214 215 216 217 218 219
              | 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
220 221 222 223 224 225 226 227
            let () =
              Ocsigen_messages.debug (fun () ->
                Printf.sprintf "Injecting credentials for %s" uuid
              )
            in
            public_creds |>
            Lwt_stream.iter_s W.B.inject_cred >>
            W.B.update_files () >>
Stephane Glondu's avatar
Stephane Glondu committed
228 229 230 231 232 233
            (
              let table = "password_" ^ underscorize uuid in
              let table = Ocsipersist.open_table table in
              lwt size = Ocsipersist.length table in
              if size > 0 then dump_passwords dir table uuid else return_unit
            ) >>
Stephane Glondu's avatar
Stephane Glondu committed
234
            let () = Lwt_mutex.unlock registration_mutex in
235
            return (module W : WEB_ELECTION)
Stephane Glondu's avatar
Stephane Glondu committed
236 237 238 239 240 241 242 243 244 245 246 247 248 249 250
          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
251
    )
Stephane Glondu's avatar
Stephane Glondu committed
252 253 254 255 256 257
  with e ->
    Lwt_mutex.unlock registration_mutex;
    Lwt.fail e

let () = Any.register ~service:home
  (fun () () ->
Stephane Glondu's avatar
Stephane Glondu committed
258
    Eliom_reference.unset Web_auth_state.cont >>
259
    T.home () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
260 261 262 263
  )

let () = Html5.register ~service:admin
  (fun () () ->
Stephane Glondu's avatar
Stephane Glondu committed
264 265 266
    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
267
    lwt elections =
268
      match site_user with
269
      | None -> return None
Stephane Glondu's avatar
Stephane Glondu committed
270
      | Some u ->
271
         lwt elections, tallied =
Stephane Glondu's avatar
Stephane Glondu committed
272 273
           Web_persist.get_elections_by_owner u >>=
           Lwt_list.fold_left_s (fun accu uuid_s ->
274
               lwt w = find_election uuid_s in
275
               lwt state = Web_persist.get_election_state uuid_s in
276
               lwt date = Web_persist.get_election_date uuid_s in
277
               let elections, tallied = accu in
278
               match state with
279 280
               | `Tallied _ -> return (elections, (date, w) :: tallied)
               | _ -> return ((date, w) :: elections, tallied)
Stephane Glondu's avatar
Stephane Glondu committed
281
           ) ([], [])
282 283 284
         and setup_elections =
           Ocsipersist.fold_step (fun k v accu ->
             if v.se_owner = u
285
             then return ((uuid_of_string k, v.se_questions.t_name) :: accu)
286 287
             else return accu
           ) election_stable []
288 289 290 291 292 293 294
         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
295
    in
296
    T.admin ~elections ()
Stephane Glondu's avatar
Stephane Glondu committed
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
  )

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

let do_get_randomness =
  let prng = Lazy.lazy_from_fun (Lwt_preemptive.detach (fun () ->
    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)
313 314
    )

Stephane Glondu's avatar
Stephane Glondu committed
315 316 317 318 319 320 321 322 323 324 325 326 327
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 ())

let () = Redirection.register ~service:election_setup_new
  (fun () () ->
Stephane Glondu's avatar
Stephane Glondu committed
328
   match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
329 330 331 332 333 334
   | Some u ->
      let uuid = generate_uuid () in
      let uuid_s = Uuidm.to_string uuid in
      lwt token = generate_token () in
      let se_metadata = {
        e_owner = Some u;
335
        e_auth_config = Some [{auth_system = "password"; auth_instance = "password"; auth_config = []}];
336
        e_cred_authority = None;
Stephane Glondu's avatar
Stephane Glondu committed
337 338
      } in
      let question = {
339 340
        q_answers = [| "Answer 1"; "Answer 2"; "Blank" |];
        q_min = 1;
Stephane Glondu's avatar
Stephane Glondu committed
341 342 343 344 345 346 347 348 349 350 351 352
        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\"}";
Stephane Glondu's avatar
Stephane Glondu committed
353
        se_voters = [];
Stephane Glondu's avatar
Stephane Glondu committed
354 355 356 357 358 359 360 361 362 363 364
        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 ()
  )

365 366 367 368 369 370 371 372 373 374
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
375
let () = Html5.register ~service:election_setup
376
  (generic_setup_page T.election_setup)
Stephane Glondu's avatar
Stephane Glondu committed
377

378
let () = Html5.register ~service:election_setup_trustees
379 380 381 382
  (generic_setup_page T.election_setup_trustees)

let () = Html5.register ~service:election_setup_credential_authority
  (generic_setup_page T.election_setup_credential_authority)
383

Stephane Glondu's avatar
Stephane Glondu committed
384 385
let election_setup_mutex = Lwt_mutex.create ()

386
let handle_setup f uuid x =
Stephane Glondu's avatar
Stephane Glondu committed
387
  match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
388 389 390 391 392 393
  | 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
394
           lwt cont = f se x u uuid in
Stephane Glondu's avatar
Stephane Glondu committed
395
           Ocsipersist.add election_stable uuid_s se >>
396
           cont ()
Stephane Glondu's avatar
Stephane Glondu committed
397
         with e ->
398
           T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
399 400 401
       ) else forbidden ()
     )
  | None -> forbidden ()
402

403 404
let redir_preapply s u () = Redirection.send (preapply s u)

405 406 407 408
let () =
  Any.register
    ~service:election_setup_description
    (handle_setup
409
       (fun se (name, description) _ uuid ->
410 411 412
         se.se_questions <- {se.se_questions with
           t_name = name;
           t_description = description;
413 414
         };
         return (redir_preapply election_setup uuid)))
415

Stephane Glondu's avatar
Stephane Glondu committed
416 417 418 419
let () =
  Any.register
    ~service:election_setup_group
    (handle_setup
420
       (fun se x _ uuid ->
Stephane Glondu's avatar
Stephane Glondu committed
421 422
        let _group = Group.of_string x in
        (* we keep it as a string since it contains a type *)
423 424
        se.se_group <- x;
        return (redir_preapply election_setup uuid)))
425

Stephane Glondu's avatar
Stephane Glondu committed
426 427 428 429
let () =
  Any.register
    ~service:election_setup_metadata
    (handle_setup
430
       (fun se x u uuid ->
Stephane Glondu's avatar
Stephane Glondu committed
431 432
        let metadata = metadata_of_string x in
        if metadata.e_owner <> Some u then failwith "wrong owner";
433 434
        se.se_metadata <- metadata;
        return (redir_preapply election_setup uuid)))
435

436 437 438 439
let () =
  Any.register
    ~service:election_setup_auth
    (handle_setup
440 441
       (fun se auth_system _ uuid ->
         (match auth_system with
442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460
         | 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)
461 462
         | None -> failwith "no authentication system was given");
         return (redir_preapply election_setup uuid)))
463 464 465 466 467

let () =
  Any.register
    ~service:election_setup_auth_cas
    (handle_setup
468
       (fun se server _ uuid ->
469 470 471 472 473 474 475
         se.se_metadata <- {
           se.se_metadata with
             e_auth_config = Some [{
               auth_system = "cas";
               auth_instance = "cas";
               auth_config = ["server", server];
             }]
476 477
         };
         return (redir_preapply election_setup uuid)))
478

479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500
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"

501 502
let generate_password table title url id =
  let email, login = split_identity id in
503 504 505
  lwt salt = generate_token () in
  lwt password = generate_token () in
  let hashed = sha256_hex (salt ^ password) in
506 507
  lwt () = Ocsipersist.add table login (salt, hashed) in
  let body = Printf.sprintf template_password title login password url in
508
  let subject = "Your password for election " ^ title in
509
  send_email "noreply@belenios.org" email subject body
510

511 512 513 514 515
let () =
  Any.register
    ~service:election_setup_auth_genpwd
    (handle_setup
       (fun se () _ uuid ->
Stephane Glondu's avatar
Stephane Glondu committed
516 517
         let uuid_s = Uuidm.to_string uuid in
         let table = "password_" ^ underscorize uuid_s in
518 519 520 521 522
         let title = se.se_questions.t_name in
         let url = Eliom_uri.make_string_uri
           ~absolute:true ~service:election_home
           (uuid, ()) |> rewrite_prefix
         in
523
         let table = Ocsipersist.open_table table in
524
         Lwt_list.iter_s (generate_password table title url) se.se_voters >>
525 526 527
         return (fun () ->
           T.generic_page ~title:"Success"
             "Passwords have been generated and mailed!" () >>= Html5.send)))
528

529 530 531
let () =
  Any.register
    ~service:election_regenpwd
532 533 534 535 536 537 538
    (fun (uuid, ()) user ->
      T.regenpwd uuid () >>= Html5.send)

let () =
  Any.register
    ~service:election_regenpwd_post
    (fun (uuid, ()) user ->
539
      let uuid_s = Uuidm.to_string uuid in
540 541
      lwt w = find_election uuid_s in
      let module W = (val w) in
542 543 544 545 546 547 548 549 550 551 552 553 554
      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
           generate_password table title url user >>
Stephane Glondu's avatar
Stephane Glondu committed
555
           dump_passwords W.dir table uuid_s >>
556 557 558 559 560 561 562 563 564 565 566
           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
567 568 569 570
let () =
  Html5.register
    ~service:election_setup_questions
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
571
     match_lwt Web_auth_state.get_site_user () with
572 573
     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
Stephane Glondu's avatar
Stephane Glondu committed
574 575
        lwt se = Ocsipersist.find election_stable uuid_s in
        if se.se_owner = u
576
        then T.election_setup_questions uuid se ()
Stephane Glondu's avatar
Stephane Glondu committed
577 578
        else forbidden ()
     | None -> forbidden ()
579 580
    )

Stephane Glondu's avatar
Stephane Glondu committed
581 582 583 584
let () =
  Any.register
    ~service:election_setup_questions_post
    (handle_setup
585 586 587
       (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
588

Stephane Glondu's avatar
Stephane Glondu committed
589 590 591 592
let () =
  Html5.register
    ~service:election_setup_voters
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
593
      match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
594 595 596 597
      | Some u ->
         let uuid_s = Uuidm.to_string uuid in
         lwt se = Ocsipersist.find election_stable uuid_s in
         if se.se_owner = u
598
         then T.election_setup_voters uuid se ()
Stephane Glondu's avatar
Stephane Glondu committed
599 600 601 602 603 604 605
         else forbidden ()
      | None -> forbidden ()
    )

(* see http://www.regular-expressions.info/email.html *)
let email_rex = Pcre.regexp
  ~flags:[`CASELESS]
606
  "^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,7}(,[A-Z0-9._%+-]+)?$"
Stephane Glondu's avatar
Stephane Glondu committed
607 608 609 610 611 612 613 614 615

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

let () =
  Any.register
    ~service:election_setup_voters_post
    (handle_setup
616
       (fun se x _ uuid ->
Stephane Glondu's avatar
Stephane Glondu committed
617 618 619 620 621 622 623
         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
624 625
         se.se_voters <- xs;
         return (redir_preapply election_setup uuid)))
Stephane Glondu's avatar
Stephane Glondu committed
626

Stephane Glondu's avatar
Stephane Glondu committed
627 628 629
let () =
  Redirection.register
    ~service:election_setup_trustee_add
630
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
631
     match_lwt Web_auth_state.get_site_user () with
632 633
     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
Stephane Glondu's avatar
Stephane Glondu committed
634 635 636 637 638 639 640 641 642 643
        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 ()
        ) >>
644
        return (preapply election_setup_trustees uuid)
645 646 647 648 649 650 651
     | None -> forbidden ()
    )

let () =
  Redirection.register
    ~service:election_setup_trustee_del
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
652
     match_lwt Web_auth_state.get_site_user () with
653 654 655 656 657 658 659 660 661 662 663 664 665 666
     | 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 ()
        ) >>
667
        return (preapply election_setup_trustees uuid)
668 669 670
     | None -> forbidden ()
    )

Stephane Glondu's avatar
Stephane Glondu committed
671 672 673 674 675 676 677 678
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 ()
    )
679

Stephane Glondu's avatar
Stephane Glondu committed
680 681 682 683 684 685 686 687
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")
    )
688

Stephane Glondu's avatar
Stephane Glondu committed
689 690 691
let wrap_handler f =
  try_lwt f ()
  with
692
  | e -> T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
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

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 = !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
719
  let () = se.se_metadata <- {se.se_metadata with e_cred_authority = None} in
720 721
  T.generic_page ~title:"Success"
    "Credentials have been received and checked!" () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
722 723 724 725 726 727 728

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))
729

Stephane Glondu's avatar
Stephane Glondu committed
730 731 732 733 734 735 736
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))

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
module Credgen = struct
  module String = PString

  (* FIXME: duplicate of Tool_credgen *)

  let get_random_char =
    let prng = Lazy.lazy_from_fun (Lwt_preemptive.detach (fun () ->
      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 () =
    let res = String.create token_length in
    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
        res.[i] <- digits.[digit];
        loop (i+1) Z.(n58 * accu + of_int digit)
      ) else return (res, accu)
    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

780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
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"

802 803 804
let () =
  Any.register
    ~service:election_setup_credentials_server
805
    (handle_setup (fun se () _ uuid ->
806 807 808
      let () = se.se_metadata <- {se.se_metadata with
        e_cred_authority = Some "server"
      } in
809
      let uuid_s = Uuidm.to_string uuid in
810 811 812 813 814
      let title = se.se_questions.t_name in
      let url = Eliom_uri.make_string_uri
        ~absolute:true ~service:election_home
        (uuid, ()) |> rewrite_prefix
      in
815 816 817 818
      lwt se = Ocsipersist.find election_stable uuid_s in
      let module S = Set.Make (PString) in
      let module G = (val Group.of_string se.se_group : GROUP) in
      lwt creds =
819 820
        Lwt_list.fold_left_s (fun accu identity ->
          let email, login = split_identity identity in
821 822 823 824 825 826 827
          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
828
          let body = Printf.sprintf template_credential title login cred url in
829
          let subject = "Your credential for election " ^ title in
830
          lwt () = send_email "noreply@belenios.org" email subject body in
831 832 833 834 835
          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
836
      lwt () =
837 838 839 840
          Lwt_io.with_file
            ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
            ~perm:0o600 ~mode:Lwt_io.Output fname
            (fun oc ->
841
              Lwt_list.iter_s (Lwt_io.write_line oc) creds)
842
      in
843 844 845
      return (fun () ->
        T.generic_page ~title:"Success"
          "Credentials have been generated and mailed!" () >>= Html5.send)))
846

Stephane Glondu's avatar
Stephane Glondu committed
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
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
875 876 877
          ) >> T.generic_page ~title:"Success"
            "Your key has been received and checked!"
            () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
878 879 880 881 882 883 884
       )
    )

let () =
  Any.register
    ~service:election_setup_create
    (fun uuid () ->
Stephane Glondu's avatar
Stephane Glondu committed
885
     match_lwt Web_auth_state.get_site_user () with
Stephane Glondu's avatar
Stephane Glondu committed
886 887 888
     | None -> forbidden ()
     | Some u ->
        begin try_lwt
889 890 891
          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
892 893 894
            if se.se_owner <> u then forbidden () else
            let group = Group.of_string se.se_group in
            let module G = (val group : GROUP) in
895
            let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
Stephane Glondu's avatar
Stephane Glondu committed
896
            (* construct election data in memory *)
897
            lwt public_keys, private_key =
Stephane Glondu's avatar
Stephane Glondu committed
898
              match se.se_public_keys with
899 900 901 902 903 904 905 906 907
              | [] ->
                 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
908 909 910 911 912 913
            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;
914
              e_public_key = {wpk_group = G.group; wpk_y = y};
Stephane Glondu's avatar
Stephane Glondu committed
915 916 917 918 919 920 921 922 923
              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
924
              f_voters = !spool_dir / uuid_s ^ ".voters.txt";
Stephane Glondu's avatar
Stephane Glondu committed
925 926 927 928 929 930
            } in
            lwt _ =
              try_lwt Lwt_unix.stat files.f_public_creds
              with _ -> failwith "public credentials are missing"
            in
            (* write election files to disk *)
931
            let create_file fname what xs =
Stephane Glondu's avatar
Stephane Glondu committed
932 933 934
              Lwt_io.with_file
                ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
                ~perm:0o600 ~mode:Lwt_io.Output fname
935 936 937 938 939
                (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
940
            in
941 942 943 944
            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] >>
            create_file files.f_voters (fun x -> x) se.se_voters >>
            create_file files.f_public_keys (string_of_trustee_public_key G.write) public_keys >>
Stephane Glondu's avatar
Stephane Glondu committed
945 946 947
            (* actually create the election *)
            begin match_lwt import_election files with
            | None ->
948
               T.new_election_failure `Exists () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
949 950 951 952
            | Some w ->
               let module W = (val w : REGISTRABLE_ELECTION) in
               lwt w = W.register () in
               let module W = (val w : WEB_ELECTION) in
953 954 955 956 957
               (* create file with private key, if any *)
               lwt () =
                 match private_key with
                 | None -> return ()
                 | Some x ->
958
                    let fname = W.D.dir / "private_key.json" in
959
                    create_file fname string_of_number [x]
960
               in
Stephane Glondu's avatar
Stephane Glondu committed
961 962 963 964 965
               (* 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
966
               Lwt_unix.unlink files.f_voters >>
Stephane Glondu's avatar
Stephane Glondu committed
967 968 969 970 971 972 973
               (* 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 >>
974
               Web_persist.set_election_date uuid_s (now ()) >>
Stephane Glondu's avatar
Stephane Glondu committed
975
               Redirection.send
976
                 (preapply election_admin (W.D.election.e_params.e_uuid, ()))
Stephane Glondu's avatar
Stephane Glondu committed
977 978 979
            end
          )
        with e ->
980
          T.new_election_failure (`Exception e) () >>= Html5.send
Stephane Glondu's avatar
Stephane Glondu committed
981 982
        end
    )
983

Stephane Glondu's avatar
Stephane Glondu committed
984 985 986 987
let () =
  Any.register
    ~service:election_home
    (fun (uuid, ()) () ->
988
      let uuid_s = Uuidm.to_string uuid in
989 990 991
      try_lwt
        lwt w = find_election uuid_s in
        let module W = (val w) in
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
        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 Not_found ->
Stephane Glondu's avatar
Stephane Glondu committed
1007
        T.generic_page ~title:"Sorry, this election is not yet open"
1008 1009
          "This election does not exist yet. Please come back later." ()
          >>= Html5.send)
1010

Stephane Glondu's avatar
Stephane Glondu committed
1011 1012 1013 1014 1015
let () =
  Any.register
    ~service:election_admin
    (fun (uuid, ()) () ->
     let uuid_s = Uuidm.to_string uuid in
1016
     lwt w = find_election uuid_s in
Stephane Glondu's avatar
Stephane Glondu committed
1017
     lwt site_user = Web_auth_state.get_site_user () in
1018
     let module W = (val w) in
1019 1020 1021 1022
     let uuid = Uuidm.to_string W.election.e_params.e_uuid in
     match site_user with
     | Some u when W.metadata.e_owner = Some u ->
        lwt state = Web_persist.get_election_state uuid in
1023
        T.election_admin (module W) state () >>= Html5.send
1024 1025
       | _ -> forbidden ()
    )
1026

1027
let election_set_state state (uuid, ()) () =
Stephane Glondu's avatar
Stephane Glondu committed
1028
     let uuid_s = Uuidm.to_string uuid in
1029 1030
     lwt w = find_election uuid_s in
     let module W = (val w) in
1031
     lwt () =
Stephane Glondu's avatar
Stephane Glondu committed
1032
       match_lwt Web_auth_state.get_site_user () with
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
       | Some u when W.metadata.e_owner = Some u -> return ()
       | _ -> forbidden ()
     in
     lwt () =
       match_lwt Web_persist.get_election_state uuid_s with
       | `Open | `Closed -> return ()
       | _ -> forbidden ()
     in
     let state = if state then `Open else `Closed in
     Web_persist.set_election_state uuid_s state >>
1043 1044 1045 1046
     Redirection.send (preapply election_admin (uuid, ()))

let () = Any.register ~service:election_open (election_set_state true)
let () = Any.register ~service:election_close (election_set_state false)
1047

Stephane Glondu's avatar
Stephane Glondu committed
1048 1049 1050 1051 1052
let () =
  Any.register
    ~service:election_update_credential
    (fun (uuid, ()) () ->
     let uuid_s = Uuidm.to_string uuid in
1053
     lwt w = find_election uuid_s in
Stephane Glondu's avatar
Stephane Glondu committed
1054
     lwt site_user = Web_auth_state.get_site_user () in
1055
     let module W = (val w) in
1056 1057 1058
     match site_user with
     | Some u ->
        if W.metadata.e_owner = Some u then (
1059
          T.update_credential (module W) () >>= Html5.send
1060 1061 1062 1063
        ) else (
          forbidden ()
        )
     | _ -> forbidden ())
Stephane Glondu's avatar
Stephane Glondu committed
1064 1065 1066 1067

let () =
  Any.register
    ~service:election_update_credential_post
1068
    (fun (uuid, ()) (old, new_) ->
Stephane Glondu's avatar
Stephane Glondu committed
1069
     let uuid_s = Uuidm.to_string uuid in
1070
     lwt w = find_election uuid_s in
Stephane Glondu's avatar
Stephane Glondu committed
1071
     lwt site_user = Web_auth_state.get_site_user () in
1072
     let module W = Web_election.Make ((val w)) (LwtRandom) in
1073 1074
     let module B = W.B in
     let module W =