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