citadel/modules/listsub/serv_listsub.c

   1 /*
   2  * $Id$
   3  *
   4  * This module handles self-service subscription/unsubscription to mail lists.
   5  *
   6  * Copyright (c) 2002-2009 by the citadel.org team
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include "sysdep.h"
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <stdio.h>
  28 #include <fcntl.h>
  29 #include <ctype.h>
  30 #include <signal.h>
  31 #include <pwd.h>
  32 #include <errno.h>
  33 #include <sys/types.h>
  34 #include <dirent.h>
  35 #if TIME_WITH_SYS_TIME
  36 # include <sys/time.h>
  37 # include <time.h>
  38 #else
  39 # if HAVE_SYS_TIME_H
  40 #  include <sys/time.h>
  41 # else
  42 #  include <time.h>
  43 # endif
  44 #endif
  45
  46 #include <sys/wait.h>
  47 #include <string.h>
  48 #include <limits.h>
  49 #include <libcitadel.h>
  50 #include "citadel.h"
  51 #include "server.h"
  52 #include "citserver.h"
  53 #include "support.h"
  54 #include "config.h"
  55 #include "user_ops.h"
  56 #include "policy.h"
  57 #include "database.h"
  58 #include "msgbase.h"
  59 #include "internet_addressing.h"
  60 #include "clientsocket.h"
  61 #include "file_ops.h"
  62
  63 #ifndef HAVE_SNPRINTF
  64 #include "snprintf.h"
  65 #endif
  66
  67
  68
  69 #include "ctdl_module.h"
  70
  71
  72 /*
  73  * Generate a randomizationalisticized token to use for authentication of
  74  * a subscribe or unsubscribe request.
  75  */
  76 void listsub_generate_token(char *buf) {
  77         char sourcebuf[SIZ];
  78         static int seq = 0;
  79
  80         /* Theo, please sit down and shut up.  This key doesn't have to be
  81          * tinfoil-hat secure, it just needs to be reasonably unguessable
  82          * and unique.
  83          */
  84         sprintf(sourcebuf, "%lx",
  85                 (long) (++seq + getpid() + time(NULL))
  86         );
  87
  88         /* Convert it to base64 so it looks cool */
  89         CtdlEncodeBase64(buf, sourcebuf, strlen(sourcebuf), 0);
  90 }
  91
  92
  93 /*
  94  * Enter a subscription request
  95  */
  96 void do_subscribe(char *room, char *email, char *subtype, char *webpage) {
  97         struct ctdlroom qrbuf;
  98         FILE *ncfp;
  99         char filename[256];
 100         char token[256];
 101         char confirmation_request[2048];
 102         char buf[512];
 103         char urlroom[ROOMNAMELEN];
 104         char scancmd[64];
 105         char scanemail[256];
 106         int found_sub = 0;
 107
 108         if (CtdlGetRoom(&qrbuf, room) != 0) {
 109                 cprintf("%d There is no list called '%s'\n", ERROR + ROOM_NOT_FOUND, room);
 110                 return;
 111         }
 112
 113         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 114                 cprintf("%d '%s' "
 115                         "does not accept subscribe/unsubscribe requests.\n",
 116                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 117                 return;
 118         }
 119
 120         listsub_generate_token(token);
 121
 122         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 123
 124         /*
 125          * Make sure the requested address isn't already subscribed
 126          */
 127         begin_critical_section(S_NETCONFIGS);
 128         ncfp = fopen(filename, "r");
 129         if (ncfp != NULL) {
 130                 while (fgets(buf, sizeof buf, ncfp) != NULL) {
 131                         buf[strlen(buf)-1] = 0;
 132                         extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 133                         extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 134                         if ((!strcasecmp(scancmd, "listrecp"))
 135                            || (!strcasecmp(scancmd, "digestrecp"))) {
 136                                 if (!strcasecmp(scanemail, email)) {
 137                                         ++found_sub;
 138                                 }
 139                         }
 140                 }
 141                 fclose(ncfp);
 142         }
 143         end_critical_section(S_NETCONFIGS);
 144
 145         if (found_sub != 0) {
 146                 cprintf("%d '%s' is already subscribed to '%s'.\n",
 147                         ERROR + ALREADY_EXISTS,
 148                         email, qrbuf.QRname);
 149                 return;
 150         }
 151
 152         /*
 153          * Now add it to the file
 154          */
 155         begin_critical_section(S_NETCONFIGS);
 156         ncfp = fopen(filename, "a");
 157         if (ncfp != NULL) {
 158                 fprintf(ncfp, "subpending|%s|%s|%s|%ld|%s\n",
 159                         email,
 160                         subtype,
 161                         token,
 162                         time(NULL),
 163                         webpage
 164                 );
 165                 fclose(ncfp);
 166         }
 167         end_critical_section(S_NETCONFIGS);
 168
 169         /* Generate and send the confirmation request */
 170
 171         urlesc(urlroom, ROOMNAMELEN, qrbuf.QRname);
 172
 173         snprintf(confirmation_request, sizeof confirmation_request,
 174
 175                 "MIME-Version: 1.0\n"
 176                 "Content-Type: multipart/alternative; boundary=\"__ctdlmultipart__\"\n"
 177                 "\n"
 178                 "This is a multipart message in MIME format.\n"
 179                 "\n"
 180                 "--__ctdlmultipart__\n"
 181                 "Content-type: text/plain\n"
 182                 "\n"
 183                 "Someone (probably you) has submitted a request to subscribe\n"
 184                 "<%s> to the '%s' mailing list.\n"
 185                 "\n"
 186                 "Please go here to confirm this request:\n"
 187                 "  %s?room=%s&token=%s&cmd=confirm  \n"
 188                 "\n"
 189                 "If this request has been submitted in error and you do not\n"
 190                 "wish to receive the '%s' mailing list, simply do nothing,\n"
 191                 "and you will not receive any further mailings.\n"
 192                 "\n"
 193                 "--__ctdlmultipart__\n"
 194                 "Content-type: text/html\n"
 195                 "\n"
 196                 "<HTML><BODY>\n"
 197                 "Someone (probably you) has submitted a request to subscribe\n"
 198                 "&lt;%s&gt; to the <B>%s</B> mailing list.<BR><BR>\n"
 199                 "Please click here to confirm this request:<BR>\n"
 200                 "<A HREF=\"%s?room=%s&token=%s&cmd=confirm\">"
 201                 "%s?room=%s&token=%s&cmd=confirm</A><BR><BR>\n"
 202                 "If this request has been submitted in error and you do not\n"
 203                 "wish to receive the '%s' mailing list, simply do nothing,\n"
 204                 "and you will not receive any further mailings.\n"
 205                 "</BODY></HTML>\n"
 206                 "\n"
 207                 "--__ctdlmultipart__--\n",
 208
 209                 email, qrbuf.QRname,
 210                 webpage, urlroom, token,
 211                 qrbuf.QRname,
 212
 213                 email, qrbuf.QRname,
 214                 webpage, urlroom, token,
 215                 webpage, urlroom, token,
 216                 qrbuf.QRname
 217         );
 218
 219         quickie_message(        /* This delivers the message */
 220                 "Citadel",
 221                 NULL,
 222                 email,
 223                 NULL,
 224                 confirmation_request,
 225                 FMT_RFC822,
 226                 "Please confirm your list subscription"
 227         );
 228
 229         cprintf("%d Subscription entered; confirmation request sent\n", CIT_OK);
 230 }
 231
 232
 233 /*
 234  * Enter an unsubscription request
 235  */
 236 void do_unsubscribe(char *room, char *email, char *webpage) {
 237         struct ctdlroom qrbuf;
 238         FILE *ncfp;
 239         char filename[256];
 240         char token[256];
 241         char buf[512];
 242         char confirmation_request[2048];
 243         char urlroom[ROOMNAMELEN];
 244         char scancmd[256];
 245         char scanemail[256];
 246         int found_sub = 0;
 247
 248         if (CtdlGetRoom(&qrbuf, room) != 0) {
 249                 cprintf("%d There is no list called '%s'\n",
 250                         ERROR + ROOM_NOT_FOUND, room);
 251                 return;
 252         }
 253
 254         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 255                 cprintf("%d '%s' "
 256                         "does not accept subscribe/unsubscribe requests.\n",
 257                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 258                 return;
 259         }
 260
 261         listsub_generate_token(token);
 262
 263         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 264
 265         /*
 266          * Make sure there's actually a subscription there to remove
 267          */
 268         begin_critical_section(S_NETCONFIGS);
 269         ncfp = fopen(filename, "r");
 270         if (ncfp != NULL) {
 271                 while (fgets(buf, sizeof buf, ncfp) != NULL) {
 272                         buf[strlen(buf)-1] = 0;
 273                         extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 274                         extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 275                         if ((!strcasecmp(scancmd, "listrecp"))
 276                            || (!strcasecmp(scancmd, "digestrecp"))) {
 277                                 if (!strcasecmp(scanemail, email)) {
 278                                         ++found_sub;
 279                                 }
 280                         }
 281                 }
 282                 fclose(ncfp);
 283         }
 284         end_critical_section(S_NETCONFIGS);
 285
 286         if (found_sub == 0) {
 287                 cprintf("%d '%s' is not subscribed to '%s'.\n",
 288                         ERROR + NO_SUCH_USER,
 289                         email, qrbuf.QRname);
 290                 return;
 291         }
 292
 293         /*
 294          * Ok, now enter the unsubscribe-pending entry.
 295          */
 296         begin_critical_section(S_NETCONFIGS);
 297         ncfp = fopen(filename, "a");
 298         if (ncfp != NULL) {
 299                 fprintf(ncfp, "unsubpending|%s|%s|%ld|%s\n",
 300                         email,
 301                         token,
 302                         time(NULL),
 303                         webpage
 304                 );
 305                 fclose(ncfp);
 306         }
 307         end_critical_section(S_NETCONFIGS);
 308
 309         /* Generate and send the confirmation request */
 310
 311         urlesc(urlroom, ROOMNAMELEN, qrbuf.QRname);
 312
 313         snprintf(confirmation_request, sizeof confirmation_request,
 314
 315                 "MIME-Version: 1.0\n"
 316                 "Content-Type: multipart/alternative; boundary=\"__ctdlmultipart__\"\n"
 317                 "\n"
 318                 "This is a multipart message in MIME format.\n"
 319                 "\n"
 320                 "--__ctdlmultipart__\n"
 321                 "Content-type: text/plain\n"
 322                 "\n"
 323                 "Someone (probably you) has submitted a request to unsubscribe\n"
 324                 "<%s> from the '%s' mailing list.\n"
 325                 "\n"
 326                 "Please go here to confirm this request:\n"
 327                 "  %s?room=%s&token=%s&cmd=confirm  \n"
 328                 "\n"
 329                 "If this request has been submitted in error and you do not\n"
 330                 "wish to unsubscribe from the '%s' mailing list, simply do nothing,\n"
 331                 "and the request will not be processed.\n"
 332                 "\n"
 333                 "--__ctdlmultipart__\n"
 334                 "Content-type: text/html\n"
 335                 "\n"
 336                 "<HTML><BODY>\n"
 337                 "Someone (probably you) has submitted a request to unsubscribe\n"
 338                 "&lt;%s&gt; from the <B>%s</B> mailing list.<BR><BR>\n"
 339                 "Please click here to confirm this request:<BR>\n"
 340                 "<A HREF=\"%s?room=%s&token=%s&cmd=confirm\">"
 341                 "%s?room=%s&token=%s&cmd=confirm</A><BR><BR>\n"
 342                 "If this request has been submitted in error and you do not\n"
 343                 "wish to unsubscribe from the '%s' mailing list, simply do nothing,\n"
 344                 "and the request will not be processed.\n"
 345                 "</BODY></HTML>\n"
 346                 "\n"
 347                 "--__ctdlmultipart__--\n",
 348
 349                 email, qrbuf.QRname,
 350                 webpage, urlroom, token,
 351                 qrbuf.QRname,
 352
 353                 email, qrbuf.QRname,
 354                 webpage, urlroom, token,
 355                 webpage, urlroom, token,
 356                 qrbuf.QRname
 357         );
 358
 359         quickie_message(        /* This delivers the message */
 360                 "Citadel",
 361                 NULL,
 362                 email,
 363                 NULL,
 364                 confirmation_request,
 365                 FMT_RFC822,
 366                 "Please confirm your unsubscribe request"
 367         );
 368
 369         cprintf("%d Unubscription noted; confirmation request sent\n", CIT_OK);
 370 }
 371
 372
 373 /*
 374  * Confirm a subscribe/unsubscribe request.
 375  */
 376 void do_confirm(char *room, char *token) {
 377         struct ctdlroom qrbuf;
 378         FILE *ncfp;
 379         char filename[256];
 380         char line_token[256];
 381         long line_offset;
 382         int line_length;
 383         char buf[512];
 384         char cmd[256];
 385         char email[256];
 386         char subtype[128];
 387         int success = 0;
 388         char address_to_unsubscribe[256];
 389         char scancmd[256];
 390         char scanemail[256];
 391         char *holdbuf = NULL;
 392         int linelen = 0;
 393         int buflen = 0;
 394
 395         strcpy(address_to_unsubscribe, "");
 396
 397         if (CtdlGetRoom(&qrbuf, room) != 0) {
 398                 cprintf("%d There is no list called '%s'\n",
 399                         ERROR + ROOM_NOT_FOUND, room);
 400                 return;
 401         }
 402
 403         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 404                 cprintf("%d '%s' "
 405                         "does not accept subscribe/unsubscribe requests.\n",
 406                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 407                 return;
 408         }
 409
 410         /*
 411          * Now start scanning this room's netconfig file for the
 412          * specified token.
 413          */
 414         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 415         begin_critical_section(S_NETCONFIGS);
 416         ncfp = fopen(filename, "r+");
 417         if (ncfp != NULL) {
 418                 while (line_offset = ftell(ncfp),
 419                       (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 420                         buf[strlen(buf)-1] = 0;
 421                         line_length = strlen(buf);
 422                         extract_token(cmd, buf, 0, '|', sizeof cmd);
 423                         if (!strcasecmp(cmd, "subpending")) {
 424                                 extract_token(email, buf, 1, '|', sizeof email);
 425                                 extract_token(subtype, buf, 2, '|', sizeof subtype);
 426                                 extract_token(line_token, buf, 3, '|', sizeof line_token);
 427                                 if (!strcasecmp(token, line_token)) {
 428                                         if (!strcasecmp(subtype, "digest")) {
 429                                                 safestrncpy(buf, "digestrecp|", sizeof buf);
 430                                         }
 431                                         else {
 432                                                 safestrncpy(buf, "listrecp|", sizeof buf);
 433                                         }
 434                                         strcat(buf, email);
 435                                         strcat(buf, "|");
 436                                         /* SLEAZY HACK: pad the line out so
 437                                          * it's the same length as the line
 438                                          * we're replacing.
 439                                          */
 440                                         while (strlen(buf) < line_length) {
 441                                                 strcat(buf, " ");
 442                                         }
 443                                         fseek(ncfp, line_offset, SEEK_SET);
 444                                         fprintf(ncfp, "%s\n", buf);
 445                                         ++success;
 446                                 }
 447                         }
 448                         if (!strcasecmp(cmd, "unsubpending")) {
 449                                 extract_token(line_token, buf, 2, '|', sizeof line_token);
 450                                 if (!strcasecmp(token, line_token)) {
 451                                         extract_token(address_to_unsubscribe, buf, 1, '|',
 452                                                 sizeof address_to_unsubscribe);
 453                                 }
 454                         }
 455                 }
 456                 fclose(ncfp);
 457         }
 458         end_critical_section(S_NETCONFIGS);
 459
 460         /*
 461          * If "address_to_unsubscribe" contains something, then we have to
 462          * make another pass at the file, stripping out lines referring to
 463          * that address.
 464          */
 465         if (!IsEmptyStr(address_to_unsubscribe)) {
 466                 holdbuf = malloc(SIZ);
 467                 begin_critical_section(S_NETCONFIGS);
 468                 ncfp = fopen(filename, "r+");
 469                 if (ncfp != NULL) {
 470                         while (line_offset = ftell(ncfp),
 471                               (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 472                                 buf[strlen(buf)-1]=0;
 473                                 extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 474                                 extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 475                                 if ( (!strcasecmp(scancmd, "listrecp"))
 476                                    && (!strcasecmp(scanemail,
 477                                                 address_to_unsubscribe)) ) {
 478                                         ++success;
 479                                 }
 480                                 else if ( (!strcasecmp(scancmd, "digestrecp"))
 481                                    && (!strcasecmp(scanemail,
 482                                                 address_to_unsubscribe)) ) {
 483                                         ++success;
 484                                 }
 485                                 else if ( (!strcasecmp(scancmd, "subpending"))
 486                                    && (!strcasecmp(scanemail,
 487                                                 address_to_unsubscribe)) ) {
 488                                         ++success;
 489                                 }
 490                                 else if ( (!strcasecmp(scancmd, "unsubpending"))
 491                                    && (!strcasecmp(scanemail,
 492                                                 address_to_unsubscribe)) ) {
 493                                         ++success;
 494                                 }
 495                                 else {  /* Not relevant, so *keep* it! */
 496                                         linelen = strlen(buf);
 497                                         holdbuf = realloc(holdbuf,
 498                                                 (buflen + linelen + 2) );
 499                                         strcpy(&holdbuf[buflen], buf);
 500                                         buflen += linelen;
 501                                         strcpy(&holdbuf[buflen], "\n");
 502                                         buflen += 1;
 503                                 }
 504                         }
 505                         fclose(ncfp);
 506                 }
 507                 ncfp = fopen(filename, "w");
 508                 if (ncfp != NULL) {
 509                         fwrite(holdbuf, buflen+1, 1, ncfp);
 510                         fclose(ncfp);
 511                 }
 512                 end_critical_section(S_NETCONFIGS);
 513                 free(holdbuf);
 514         }
 515
 516         /*
 517          * Did we do anything useful today?
 518          */
 519         if (success) {
 520                 cprintf("%d %d operation(s) confirmed.\n", CIT_OK, success);
 521                 CtdlLogPrintf(CTDL_NOTICE,
 522                         "Mailing list: %s %ssubscribed to %s with token %s\n",
 523                         email,
 524                         (!IsEmptyStr(address_to_unsubscribe)) ? "un" : "",
 525                         room,
 526                         token);
 527         }
 528         else {
 529                 cprintf("%d Invalid token.\n", ERROR + ILLEGAL_VALUE);
 530         }
 531
 532 }
 533
 534
 535
 536 /*
 537  * process subscribe/unsubscribe requests and confirmations
 538  */
 539 void cmd_subs(char *cmdbuf) {
 540
 541         char opr[256];
 542         char room[ROOMNAMELEN];
 543         char email[256];
 544         char subtype[256];
 545         char token[256];
 546         char webpage[256];
 547
 548         extract_token(opr, cmdbuf, 0, '|', sizeof opr);
 549         if (!strcasecmp(opr, "subscribe")) {
 550                 extract_token(subtype, cmdbuf, 3, '|', sizeof subtype);
 551                 if ( (strcasecmp(subtype, "list"))
 552                    && (strcasecmp(subtype, "digest")) ) {
 553                         cprintf("%d Invalid subscription type '%s'\n",
 554                                 ERROR + ILLEGAL_VALUE, subtype);
 555                 }
 556                 else {
 557                         extract_token(room, cmdbuf, 1, '|', sizeof room);
 558                         extract_token(email, cmdbuf, 2, '|', sizeof email);
 559                         extract_token(webpage, cmdbuf, 4, '|', sizeof webpage);
 560                         do_subscribe(room, email, subtype, webpage);
 561                 }
 562         }
 563         else if (!strcasecmp(opr, "unsubscribe")) {
 564                 extract_token(room, cmdbuf, 1, '|', sizeof room);
 565                 extract_token(email, cmdbuf, 2, '|', sizeof email);
 566                 extract_token(webpage, cmdbuf, 3, '|', sizeof webpage);
 567                 do_unsubscribe(room, email, webpage);
 568         }
 569         else if (!strcasecmp(opr, "confirm")) {
 570                 extract_token(room, cmdbuf, 1, '|', sizeof room);
 571                 extract_token(token, cmdbuf, 2, '|', sizeof token);
 572                 do_confirm(room, token);
 573         }
 574         else {
 575                 cprintf("%d Invalid command\n", ERROR + ILLEGAL_VALUE);
 576         }
 577 }
 578
 579
 580 /*
 581  * Module entry point
 582  */
 583 CTDL_MODULE_INIT(listsub)
 584 {
 585         if (!threading)
 586         {
 587                 CtdlRegisterProtoHook(cmd_subs, "SUBS", "List subscribe/unsubscribe");
 588         }
 589
 590         /* return our Subversion id for the Log */
 591         return "$Id$";
 592 }