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) 2002-2005 by Art Cancro and others.
   7  * This code is released under the terms of the GNU General Public License.
   8  *
   9  */
  10
  11 #include "sysdep.h"
  12 #include <stdlib.h>
  13 #include <unistd.h>
  14 #include <stdio.h>
  15 #include <fcntl.h>
  16 #include <ctype.h>
  17 #include <signal.h>
  18 #include <pwd.h>
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <dirent.h>
  22 #if TIME_WITH_SYS_TIME
  23 # include <sys/time.h>
  24 # include <time.h>
  25 #else
  26 # if HAVE_SYS_TIME_H
  27 #  include <sys/time.h>
  28 # else
  29 #  include <time.h>
  30 # endif
  31 #endif
  32
  33 #include <sys/wait.h>
  34 #include <string.h>
  35 #include <limits.h>
  36 #include <libcitadel.h>
  37 #include "citadel.h"
  38 #include "server.h"
  39 #include "citserver.h"
  40 #include "support.h"
  41 #include "config.h"
  42 #include "room_ops.h"
  43 #include "user_ops.h"
  44 #include "policy.h"
  45 #include "database.h"
  46 #include "msgbase.h"
  47 #include "internet_addressing.h"
  48 #include "clientsocket.h"
  49 #include "file_ops.h"
  50
  51 #ifndef HAVE_SNPRINTF
  52 #include "snprintf.h"
  53 #endif
  54
  55
  56
  57 #include "ctdl_module.h"
  58
  59
  60 /*
  61  * Generate a randomizationalisticized token to use for authentication of
  62  * a subscribe or unsubscribe request.
  63  */
  64 void listsub_generate_token(char *buf) {
  65         char sourcebuf[SIZ];
  66         static int seq = 0;
  67
  68         /* Theo, please sit down and shut up.  This key doesn't have to be
  69          * tinfoil-hat secure, it just needs to be reasonably unguessable
  70          * and unique.
  71          */
  72         sprintf(sourcebuf, "%lx",
  73                 (long) (++seq + getpid() + time(NULL))
  74         );
  75
  76         /* Convert it to base64 so it looks cool */
  77         CtdlEncodeBase64(buf, sourcebuf, strlen(sourcebuf), 0);
  78 }
  79
  80
  81 /*
  82  * Enter a subscription request
  83  */
  84 void do_subscribe(char *room, char *email, char *subtype, char *webpage) {
  85         struct ctdlroom qrbuf;
  86         FILE *ncfp;
  87         char filename[256];
  88         char token[256];
  89         char confirmation_request[2048];
  90         char buf[512];
  91         char urlroom[ROOMNAMELEN];
  92         char scancmd[64];
  93         char scanemail[256];
  94         int found_sub = 0;
  95
  96         if (getroom(&qrbuf, room) != 0) {
  97                 cprintf("%d There is no list called '%s'\n", ERROR + ROOM_NOT_FOUND, room);
  98                 return;
  99         }
 100
 101         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 102                 cprintf("%d '%s' "
 103                         "does not accept subscribe/unsubscribe requests.\n",
 104                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 105                 return;
 106         }
 107
 108         listsub_generate_token(token);
 109
 110         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 111
 112         /*
 113          * Make sure the requested address isn't already subscribed
 114          */
 115         begin_critical_section(S_NETCONFIGS);
 116         ncfp = fopen(filename, "r");
 117         if (ncfp != NULL) {
 118                 while (fgets(buf, sizeof buf, ncfp) != NULL) {
 119                         buf[strlen(buf)-1] = 0;
 120                         extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 121                         extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 122                         if ((!strcasecmp(scancmd, "listrecp"))
 123                            || (!strcasecmp(scancmd, "digestrecp"))) {
 124                                 if (!strcasecmp(scanemail, email)) {
 125                                         ++found_sub;
 126                                 }
 127                         }
 128                 }
 129                 fclose(ncfp);
 130         }
 131         end_critical_section(S_NETCONFIGS);
 132
 133         if (found_sub != 0) {
 134                 cprintf("%d '%s' is already subscribed to '%s'.\n",
 135                         ERROR + ALREADY_EXISTS,
 136                         email, qrbuf.QRname);
 137                 return;
 138         }
 139
 140         /*
 141          * Now add it to the file
 142          */
 143         begin_critical_section(S_NETCONFIGS);
 144         ncfp = fopen(filename, "a");
 145         if (ncfp != NULL) {
 146                 fprintf(ncfp, "subpending|%s|%s|%s|%ld|%s\n",
 147                         email,
 148                         subtype,
 149                         token,
 150                         time(NULL),
 151                         webpage
 152                 );
 153                 fclose(ncfp);
 154         }
 155         end_critical_section(S_NETCONFIGS);
 156
 157         /* Generate and send the confirmation request */
 158
 159         urlesc(urlroom, ROOMNAMELEN, qrbuf.QRname);
 160
 161         snprintf(confirmation_request, sizeof confirmation_request,
 162
 163                 "MIME-Version: 1.0\n"
 164                 "Content-Type: multipart/alternative; boundary=\"__ctdlmultipart__\"\n"
 165                 "\n"
 166                 "This is a multipart message in MIME format.\n"
 167                 "\n"
 168                 "--__ctdlmultipart__\n"
 169                 "Content-type: text/plain\n"
 170                 "\n"
 171                 "Someone (probably you) has submitted a request to subscribe\n"
 172                 "<%s> to the '%s' mailing list.\n"
 173                 "\n"
 174                 "Please go here to confirm this request:\n"
 175                 "  %s?room=%s&token=%s&cmd=confirm  \n"
 176                 "\n"
 177                 "If this request has been submitted in error and you do not\n"
 178                 "wish to receive the '%s' mailing list, simply do nothing,\n"
 179                 "and you will not receive any further mailings.\n"
 180                 "\n"
 181                 "--__ctdlmultipart__\n"
 182                 "Content-type: text/html\n"
 183                 "\n"
 184                 "<HTML><BODY>\n"
 185                 "Someone (probably you) has submitted a request to subscribe\n"
 186                 "&lt;%s&gt; to the <B>%s</B> mailing list.<BR><BR>\n"
 187                 "Please click here to confirm this request:<BR>\n"
 188                 "<A HREF=\"%s?room=%s&token=%s&cmd=confirm\">"
 189                 "%s?room=%s&token=%s&cmd=confirm</A><BR><BR>\n"
 190                 "If this request has been submitted in error and you do not\n"
 191                 "wish to receive the '%s' mailing list, simply do nothing,\n"
 192                 "and you will not receive any further mailings.\n"
 193                 "</BODY></HTML>\n"
 194                 "\n"
 195                 "--__ctdlmultipart__--\n",
 196
 197                 email, qrbuf.QRname,
 198                 webpage, urlroom, token,
 199                 qrbuf.QRname,
 200
 201                 email, qrbuf.QRname,
 202                 webpage, urlroom, token,
 203                 webpage, urlroom, token,
 204                 qrbuf.QRname
 205         );
 206
 207         quickie_message(        /* This delivers the message */
 208                 "Citadel",
 209                 NULL,
 210                 email,
 211                 NULL,
 212                 confirmation_request,
 213                 FMT_RFC822,
 214                 "Please confirm your list subscription"
 215         );
 216
 217         cprintf("%d Subscription entered; confirmation request sent\n", CIT_OK);
 218 }
 219
 220
 221 /*
 222  * Enter an unsubscription request
 223  */
 224 void do_unsubscribe(char *room, char *email, char *webpage) {
 225         struct ctdlroom qrbuf;
 226         FILE *ncfp;
 227         char filename[256];
 228         char token[256];
 229         char buf[512];
 230         char confirmation_request[2048];
 231         char urlroom[ROOMNAMELEN];
 232         char scancmd[256];
 233         char scanemail[256];
 234         int found_sub = 0;
 235
 236         if (getroom(&qrbuf, room) != 0) {
 237                 cprintf("%d There is no list called '%s'\n",
 238                         ERROR + ROOM_NOT_FOUND, room);
 239                 return;
 240         }
 241
 242         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 243                 cprintf("%d '%s' "
 244                         "does not accept subscribe/unsubscribe requests.\n",
 245                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 246                 return;
 247         }
 248
 249         listsub_generate_token(token);
 250
 251         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 252
 253         /*
 254          * Make sure there's actually a subscription there to remove
 255          */
 256         begin_critical_section(S_NETCONFIGS);
 257         ncfp = fopen(filename, "r");
 258         if (ncfp != NULL) {
 259                 while (fgets(buf, sizeof buf, ncfp) != NULL) {
 260                         buf[strlen(buf)-1] = 0;
 261                         extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 262                         extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 263                         if ((!strcasecmp(scancmd, "listrecp"))
 264                            || (!strcasecmp(scancmd, "digestrecp"))) {
 265                                 if (!strcasecmp(scanemail, email)) {
 266                                         ++found_sub;
 267                                 }
 268                         }
 269                 }
 270                 fclose(ncfp);
 271         }
 272         end_critical_section(S_NETCONFIGS);
 273
 274         if (found_sub == 0) {
 275                 cprintf("%d '%s' is not subscribed to '%s'.\n",
 276                         ERROR + NO_SUCH_USER,
 277                         email, qrbuf.QRname);
 278                 return;
 279         }
 280
 281         /*
 282          * Ok, now enter the unsubscribe-pending entry.
 283          */
 284         begin_critical_section(S_NETCONFIGS);
 285         ncfp = fopen(filename, "a");
 286         if (ncfp != NULL) {
 287                 fprintf(ncfp, "unsubpending|%s|%s|%ld|%s\n",
 288                         email,
 289                         token,
 290                         time(NULL),
 291                         webpage
 292                 );
 293                 fclose(ncfp);
 294         }
 295         end_critical_section(S_NETCONFIGS);
 296
 297         /* Generate and send the confirmation request */
 298
 299         urlesc(urlroom, ROOMNAMELEN, qrbuf.QRname);
 300
 301         snprintf(confirmation_request, sizeof confirmation_request,
 302
 303                 "MIME-Version: 1.0\n"
 304                 "Content-Type: multipart/alternative; boundary=\"__ctdlmultipart__\"\n"
 305                 "\n"
 306                 "This is a multipart message in MIME format.\n"
 307                 "\n"
 308                 "--__ctdlmultipart__\n"
 309                 "Content-type: text/plain\n"
 310                 "\n"
 311                 "Someone (probably you) has submitted a request to unsubscribe\n"
 312                 "<%s> from the '%s' mailing list.\n"
 313                 "\n"
 314                 "Please go here to confirm this request:\n"
 315                 "  %s?room=%s&token=%s&cmd=confirm  \n"
 316                 "\n"
 317                 "If this request has been submitted in error and you do not\n"
 318                 "wish to unsubscribe from the '%s' mailing list, simply do nothing,\n"
 319                 "and the request will not be processed.\n"
 320                 "\n"
 321                 "--__ctdlmultipart__\n"
 322                 "Content-type: text/html\n"
 323                 "\n"
 324                 "<HTML><BODY>\n"
 325                 "Someone (probably you) has submitted a request to unsubscribe\n"
 326                 "&lt;%s&gt; from the <B>%s</B> mailing list.<BR><BR>\n"
 327                 "Please click here to confirm this request:<BR>\n"
 328                 "<A HREF=\"%s?room=%s&token=%s&cmd=confirm\">"
 329                 "%s?room=%s&token=%s&cmd=confirm</A><BR><BR>\n"
 330                 "If this request has been submitted in error and you do not\n"
 331                 "wish to unsubscribe from the '%s' mailing list, simply do nothing,\n"
 332                 "and the request will not be processed.\n"
 333                 "</BODY></HTML>\n"
 334                 "\n"
 335                 "--__ctdlmultipart__--\n",
 336
 337                 email, qrbuf.QRname,
 338                 webpage, urlroom, token,
 339                 qrbuf.QRname,
 340
 341                 email, qrbuf.QRname,
 342                 webpage, urlroom, token,
 343                 webpage, urlroom, token,
 344                 qrbuf.QRname
 345         );
 346
 347         quickie_message(        /* This delivers the message */
 348                 "Citadel",
 349                 NULL,
 350                 email,
 351                 NULL,
 352                 confirmation_request,
 353                 FMT_RFC822,
 354                 "Please confirm your unsubscribe request"
 355         );
 356
 357         cprintf("%d Unubscription noted; confirmation request sent\n", CIT_OK);
 358 }
 359
 360
 361 /*
 362  * Confirm a subscribe/unsubscribe request.
 363  */
 364 void do_confirm(char *room, char *token) {
 365         struct ctdlroom qrbuf;
 366         FILE *ncfp;
 367         char filename[256];
 368         char line_token[256];
 369         long line_offset;
 370         int line_length;
 371         char buf[512];
 372         char cmd[256];
 373         char email[256];
 374         char subtype[128];
 375         int success = 0;
 376         char address_to_unsubscribe[256];
 377         char scancmd[256];
 378         char scanemail[256];
 379         char *holdbuf = NULL;
 380         int linelen = 0;
 381         int buflen = 0;
 382
 383         strcpy(address_to_unsubscribe, "");
 384
 385         if (getroom(&qrbuf, room) != 0) {
 386                 cprintf("%d There is no list called '%s'\n",
 387                         ERROR + ROOM_NOT_FOUND, room);
 388                 return;
 389         }
 390
 391         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 392                 cprintf("%d '%s' "
 393                         "does not accept subscribe/unsubscribe requests.\n",
 394                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 395                 return;
 396         }
 397
 398         /*
 399          * Now start scanning this room's netconfig file for the
 400          * specified token.
 401          */
 402         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 403         begin_critical_section(S_NETCONFIGS);
 404         ncfp = fopen(filename, "r+");
 405         if (ncfp != NULL) {
 406                 while (line_offset = ftell(ncfp),
 407                       (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 408                         buf[strlen(buf)-1] = 0;
 409                         line_length = strlen(buf);
 410                         extract_token(cmd, buf, 0, '|', sizeof cmd);
 411                         if (!strcasecmp(cmd, "subpending")) {
 412                                 extract_token(email, buf, 1, '|', sizeof email);
 413                                 extract_token(subtype, buf, 2, '|', sizeof subtype);
 414                                 extract_token(line_token, buf, 3, '|', sizeof line_token);
 415                                 if (!strcasecmp(token, line_token)) {
 416                                         if (!strcasecmp(subtype, "digest")) {
 417                                                 safestrncpy(buf, "digestrecp|", sizeof buf);
 418                                         }
 419                                         else {
 420                                                 safestrncpy(buf, "listrecp|", sizeof buf);
 421                                         }
 422                                         strcat(buf, email);
 423                                         strcat(buf, "|");
 424                                         /* SLEAZY HACK: pad the line out so
 425                                          * it's the same length as the line
 426                                          * we're replacing.
 427                                          */
 428                                         while (strlen(buf) < line_length) {
 429                                                 strcat(buf, " ");
 430                                         }
 431                                         fseek(ncfp, line_offset, SEEK_SET);
 432                                         fprintf(ncfp, "%s\n", buf);
 433                                         ++success;
 434                                 }
 435                         }
 436                         if (!strcasecmp(cmd, "unsubpending")) {
 437                                 extract_token(line_token, buf, 2, '|', sizeof line_token);
 438                                 if (!strcasecmp(token, line_token)) {
 439                                         extract_token(address_to_unsubscribe, buf, 1, '|',
 440                                                 sizeof address_to_unsubscribe);
 441                                 }
 442                         }
 443                 }
 444                 fclose(ncfp);
 445         }
 446         end_critical_section(S_NETCONFIGS);
 447
 448         /*
 449          * If "address_to_unsubscribe" contains something, then we have to
 450          * make another pass at the file, stripping out lines referring to
 451          * that address.
 452          */
 453         if (!IsEmptyStr(address_to_unsubscribe)) {
 454                 holdbuf = malloc(SIZ);
 455                 begin_critical_section(S_NETCONFIGS);
 456                 ncfp = fopen(filename, "r+");
 457                 if (ncfp != NULL) {
 458                         while (line_offset = ftell(ncfp),
 459                               (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 460                                 buf[strlen(buf)-1]=0;
 461                                 extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 462                                 extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 463                                 if ( (!strcasecmp(scancmd, "listrecp"))
 464                                    && (!strcasecmp(scanemail,
 465                                                 address_to_unsubscribe)) ) {
 466                                         ++success;
 467                                 }
 468                                 else if ( (!strcasecmp(scancmd, "digestrecp"))
 469                                    && (!strcasecmp(scanemail,
 470                                                 address_to_unsubscribe)) ) {
 471                                         ++success;
 472                                 }
 473                                 else if ( (!strcasecmp(scancmd, "subpending"))
 474                                    && (!strcasecmp(scanemail,
 475                                                 address_to_unsubscribe)) ) {
 476                                         ++success;
 477                                 }
 478                                 else if ( (!strcasecmp(scancmd, "unsubpending"))
 479                                    && (!strcasecmp(scanemail,
 480                                                 address_to_unsubscribe)) ) {
 481                                         ++success;
 482                                 }
 483                                 else {  /* Not relevant, so *keep* it! */
 484                                         linelen = strlen(buf);
 485                                         holdbuf = realloc(holdbuf,
 486                                                 (buflen + linelen + 2) );
 487                                         strcpy(&holdbuf[buflen], buf);
 488                                         buflen += linelen;
 489                                         strcpy(&holdbuf[buflen], "\n");
 490                                         buflen += 1;
 491                                 }
 492                         }
 493                         fclose(ncfp);
 494                 }
 495                 ncfp = fopen(filename, "w");
 496                 if (ncfp != NULL) {
 497                         fwrite(holdbuf, buflen+1, 1, ncfp);
 498                         fclose(ncfp);
 499                 }
 500                 end_critical_section(S_NETCONFIGS);
 501                 free(holdbuf);
 502         }
 503
 504         /*
 505          * Did we do anything useful today?
 506          */
 507         if (success) {
 508                 cprintf("%d %d operation(s) confirmed.\n", CIT_OK, success);
 509                 CtdlLogPrintf(CTDL_NOTICE,
 510                         "Mailing list: %s %ssubscribed to %s with token %s\n",
 511                         email,
 512                         (!IsEmptyStr(address_to_unsubscribe)) ? "un" : "",
 513                         room,
 514                         token);
 515         }
 516         else {
 517                 cprintf("%d Invalid token.\n", ERROR + ILLEGAL_VALUE);
 518         }
 519
 520 }
 521
 522
 523
 524 /*
 525  * process subscribe/unsubscribe requests and confirmations
 526  */
 527 void cmd_subs(char *cmdbuf) {
 528
 529         char opr[256];
 530         char room[ROOMNAMELEN];
 531         char email[256];
 532         char subtype[256];
 533         char token[256];
 534         char webpage[256];
 535
 536         extract_token(opr, cmdbuf, 0, '|', sizeof opr);
 537         if (!strcasecmp(opr, "subscribe")) {
 538                 extract_token(subtype, cmdbuf, 3, '|', sizeof subtype);
 539                 if ( (strcasecmp(subtype, "list"))
 540                    && (strcasecmp(subtype, "digest")) ) {
 541                         cprintf("%d Invalid subscription type '%s'\n",
 542                                 ERROR + ILLEGAL_VALUE, subtype);
 543                 }
 544                 else {
 545                         extract_token(room, cmdbuf, 1, '|', sizeof room);
 546                         extract_token(email, cmdbuf, 2, '|', sizeof email);
 547                         extract_token(webpage, cmdbuf, 4, '|', sizeof webpage);
 548                         do_subscribe(room, email, subtype, webpage);
 549                 }
 550         }
 551         else if (!strcasecmp(opr, "unsubscribe")) {
 552                 extract_token(room, cmdbuf, 1, '|', sizeof room);
 553                 extract_token(email, cmdbuf, 2, '|', sizeof email);
 554                 extract_token(webpage, cmdbuf, 3, '|', sizeof webpage);
 555                 do_unsubscribe(room, email, webpage);
 556         }
 557         else if (!strcasecmp(opr, "confirm")) {
 558                 extract_token(room, cmdbuf, 1, '|', sizeof room);
 559                 extract_token(token, cmdbuf, 2, '|', sizeof token);
 560                 do_confirm(room, token);
 561         }
 562         else {
 563                 cprintf("%d Invalid command\n", ERROR + ILLEGAL_VALUE);
 564         }
 565 }
 566
 567
 568 /*
 569  * Module entry point
 570  */
 571 CTDL_MODULE_INIT(listsub)
 572 {
 573         if (!threading)
 574         {
 575                 CtdlRegisterProtoHook(cmd_subs, "SUBS", "List subscribe/unsubscribe");
 576         }
 577
 578         /* return our Subversion id for the Log */
 579         return "$Id$";
 580 }