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                 NULL,
 208                 email,
 209                 NULL,
 210                 confirmation_request,
 211                 FMT_RFC822,
 212                 "Please confirm your list subscription"
 213         );
 214
 215         cprintf("%d Subscription entered; confirmation request sent\n", CIT_OK);
 216 }
 217
 218
 219 /*
 220  * Enter an unsubscription request
 221  */
 222 void do_unsubscribe(char *room, char *email, char *webpage) {
 223         struct ctdlroom qrbuf;
 224         FILE *ncfp;
 225         char filename[256];
 226         char token[256];
 227         char buf[512];
 228         char confirmation_request[2048];
 229         char urlroom[ROOMNAMELEN];
 230         char scancmd[256];
 231         char scanemail[256];
 232         int found_sub = 0;
 233
 234         if (getroom(&qrbuf, room) != 0) {
 235                 cprintf("%d There is no list called '%s'\n",
 236                         ERROR + ROOM_NOT_FOUND, room);
 237                 return;
 238         }
 239
 240         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 241                 cprintf("%d '%s' "
 242                         "does not accept subscribe/unsubscribe requests.\n",
 243                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 244                 return;
 245         }
 246
 247         listsub_generate_token(token);
 248
 249         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 250
 251         /*
 252          * Make sure there's actually a subscription there to remove
 253          */
 254         begin_critical_section(S_NETCONFIGS);
 255         ncfp = fopen(filename, "r");
 256         if (ncfp != NULL) {
 257                 while (fgets(buf, sizeof buf, ncfp) != NULL) {
 258                         buf[strlen(buf)-1] = 0;
 259                         extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 260                         extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 261                         if ((!strcasecmp(scancmd, "listrecp"))
 262                            || (!strcasecmp(scancmd, "digestrecp"))) {
 263                                 if (!strcasecmp(scanemail, email)) {
 264                                         ++found_sub;
 265                                 }
 266                         }
 267                 }
 268                 fclose(ncfp);
 269         }
 270         end_critical_section(S_NETCONFIGS);
 271
 272         if (found_sub == 0) {
 273                 cprintf("%d '%s' is not subscribed to '%s'.\n",
 274                         ERROR + NO_SUCH_USER,
 275                         email, qrbuf.QRname);
 276                 return;
 277         }
 278
 279         /*
 280          * Ok, now enter the unsubscribe-pending entry.
 281          */
 282         begin_critical_section(S_NETCONFIGS);
 283         ncfp = fopen(filename, "a");
 284         if (ncfp != NULL) {
 285                 fprintf(ncfp, "unsubpending|%s|%s|%ld|%s\n",
 286                         email,
 287                         token,
 288                         time(NULL),
 289                         webpage
 290                 );
 291                 fclose(ncfp);
 292         }
 293         end_critical_section(S_NETCONFIGS);
 294
 295         /* Generate and send the confirmation request */
 296
 297         urlesc(urlroom, qrbuf.QRname);
 298
 299         snprintf(confirmation_request, sizeof confirmation_request,
 300
 301                 "MIME-Version: 1.0\n"
 302                 "Content-Type: multipart/alternative; boundary=\"__ctdlmultipart__\"\n"
 303                 "\n"
 304                 "This is a multipart message in MIME format.\n"
 305                 "\n"
 306                 "--__ctdlmultipart__\n"
 307                 "Content-type: text/plain\n"
 308                 "\n"
 309                 "Someone (probably you) has submitted a request to unsubscribe\n"
 310                 "<%s> from the '%s' mailing list.\n"
 311                 "\n"
 312                 "Please go here to confirm this request:\n"
 313                 "  %s?room=%s&token=%s&cmd=confirm  \n"
 314                 "\n"
 315                 "If this request has been submitted in error and you do not\n"
 316                 "wish to unsubscribe from the '%s' mailing list, simply do nothing,\n"
 317                 "and the request will not be processed.\n"
 318                 "\n"
 319                 "--__ctdlmultipart__\n"
 320                 "Content-type: text/html\n"
 321                 "<HTML><BODY>\n"
 322                 "Someone (probably you) has submitted a request to unsubscribe\n"
 323                 "&lt;%s&gt; from the <B>%s</B> mailing list.<BR><BR>\n"
 324                 "Please click here to confirm this request:<BR>\n"
 325                 "<A HREF=\"%s?room=%s&token=%s&cmd=confirm\">"
 326                 "%s?room=%s&token=%s&cmd=confirm</A><BR><BR>\n"
 327                 "If this request has been submitted in error and you do not\n"
 328                 "wish to unsubscribe from the '%s' mailing list, simply do nothing,\n"
 329                 "and the request will not be processed.\n"
 330                 "</BODY></HTML>\n"
 331                 "\n"
 332                 "--__ctdlmultipart__--\n",
 333
 334                 email, qrbuf.QRname,
 335                 webpage, urlroom, token,
 336                 qrbuf.QRname,
 337
 338                 email, qrbuf.QRname,
 339                 webpage, urlroom, token,
 340                 webpage, urlroom, token,
 341                 qrbuf.QRname
 342         );
 343
 344         quickie_message(        /* This delivers the message */
 345                 "Citadel",
 346                 NULL,
 347                 email,
 348                 NULL,
 349                 confirmation_request,
 350                 FMT_RFC822,
 351                 "Please confirm your unsubscribe request"
 352         );
 353
 354         cprintf("%d Unubscription noted; confirmation request sent\n", CIT_OK);
 355 }
 356
 357
 358 /*
 359  * Confirm a subscribe/unsubscribe request.
 360  */
 361 void do_confirm(char *room, char *token) {
 362         struct ctdlroom qrbuf;
 363         FILE *ncfp;
 364         char filename[256];
 365         char line_token[256];
 366         long line_offset;
 367         int line_length;
 368         char buf[512];
 369         char cmd[256];
 370         char email[256];
 371         char subtype[128];
 372         int success = 0;
 373         char address_to_unsubscribe[256];
 374         char scancmd[256];
 375         char scanemail[256];
 376         char *holdbuf = NULL;
 377         int linelen = 0;
 378         int buflen = 0;
 379
 380         strcpy(address_to_unsubscribe, "");
 381
 382         if (getroom(&qrbuf, room) != 0) {
 383                 cprintf("%d There is no list called '%s'\n",
 384                         ERROR + ROOM_NOT_FOUND, room);
 385                 return;
 386         }
 387
 388         if ((qrbuf.QRflags2 & QR2_SELFLIST) == 0) {
 389                 cprintf("%d '%s' "
 390                         "does not accept subscribe/unsubscribe requests.\n",
 391                         ERROR + HIGHER_ACCESS_REQUIRED, qrbuf.QRname);
 392                 return;
 393         }
 394
 395         /*
 396          * Now start scanning this room's netconfig file for the
 397          * specified token.
 398          */
 399         assoc_file_name(filename, sizeof filename, &qrbuf, ctdl_netcfg_dir);
 400         begin_critical_section(S_NETCONFIGS);
 401         ncfp = fopen(filename, "r+");
 402         if (ncfp != NULL) {
 403                 while (line_offset = ftell(ncfp),
 404                       (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 405                         buf[strlen(buf)-1] = 0;
 406                         line_length = strlen(buf);
 407                         extract_token(cmd, buf, 0, '|', sizeof cmd);
 408                         if (!strcasecmp(cmd, "subpending")) {
 409                                 extract_token(email, buf, 1, '|', sizeof email);
 410                                 extract_token(subtype, buf, 2, '|', sizeof subtype);
 411                                 extract_token(line_token, buf, 3, '|', sizeof line_token);
 412                                 if (!strcasecmp(token, line_token)) {
 413                                         if (!strcasecmp(subtype, "digest")) {
 414                                                 safestrncpy(buf, "digestrecp|", sizeof buf);
 415                                         }
 416                                         else {
 417                                                 safestrncpy(buf, "listrecp|", sizeof buf);
 418                                         }
 419                                         strcat(buf, email);
 420                                         strcat(buf, "|");
 421                                         /* SLEAZY HACK: pad the line out so
 422                                          * it's the same length as the line
 423                                          * we're replacing.
 424                                          */
 425                                         while (strlen(buf) < line_length) {
 426                                                 strcat(buf, " ");
 427                                         }
 428                                         fseek(ncfp, line_offset, SEEK_SET);
 429                                         fprintf(ncfp, "%s\n", buf);
 430                                         ++success;
 431                                 }
 432                         }
 433                         if (!strcasecmp(cmd, "unsubpending")) {
 434                                 extract_token(line_token, buf, 2, '|', sizeof line_token);
 435                                 if (!strcasecmp(token, line_token)) {
 436                                         extract_token(address_to_unsubscribe, buf, 1, '|',
 437                                                 sizeof address_to_unsubscribe);
 438                                 }
 439                         }
 440                 }
 441                 fclose(ncfp);
 442         }
 443         end_critical_section(S_NETCONFIGS);
 444
 445         /*
 446          * If "address_to_unsubscribe" contains something, then we have to
 447          * make another pass at the file, stripping out lines referring to
 448          * that address.
 449          */
 450         if (strlen(address_to_unsubscribe) > 0) {
 451                 holdbuf = malloc(SIZ);
 452                 begin_critical_section(S_NETCONFIGS);
 453                 ncfp = fopen(filename, "r+");
 454                 if (ncfp != NULL) {
 455                         while (line_offset = ftell(ncfp),
 456                               (fgets(buf, sizeof buf, ncfp) != NULL) ) {
 457                                 buf[strlen(buf)-1]=0;
 458                                 extract_token(scancmd, buf, 0, '|', sizeof scancmd);
 459                                 extract_token(scanemail, buf, 1, '|', sizeof scanemail);
 460                                 if ( (!strcasecmp(scancmd, "listrecp"))
 461                                    && (!strcasecmp(scanemail,
 462                                                 address_to_unsubscribe)) ) {
 463                                         ++success;
 464                                 }
 465                                 else if ( (!strcasecmp(scancmd, "digestrecp"))
 466                                    && (!strcasecmp(scanemail,
 467                                                 address_to_unsubscribe)) ) {
 468                                         ++success;
 469                                 }
 470                                 else if ( (!strcasecmp(scancmd, "subpending"))
 471                                    && (!strcasecmp(scanemail,
 472                                                 address_to_unsubscribe)) ) {
 473                                         ++success;
 474                                 }
 475                                 else if ( (!strcasecmp(scancmd, "unsubpending"))
 476                                    && (!strcasecmp(scanemail,
 477                                                 address_to_unsubscribe)) ) {
 478                                         ++success;
 479                                 }
 480                                 else {  /* Not relevant, so *keep* it! */
 481                                         linelen = strlen(buf);
 482                                         holdbuf = realloc(holdbuf,
 483                                                 (buflen + linelen + 2) );
 484                                         strcpy(&holdbuf[buflen], buf);
 485                                         buflen += linelen;
 486                                         strcpy(&holdbuf[buflen], "\n");
 487                                         buflen += 1;
 488                                 }
 489                         }
 490                         fclose(ncfp);
 491                 }
 492                 ncfp = fopen(filename, "w");
 493                 if (ncfp != NULL) {
 494                         fwrite(holdbuf, buflen+1, 1, ncfp);
 495                         fclose(ncfp);
 496                 }
 497                 end_critical_section(S_NETCONFIGS);
 498                 free(holdbuf);
 499         }
 500
 501         /*
 502          * Did we do anything useful today?
 503          */
 504         if (success) {
 505                 cprintf("%d %d operation(s) confirmed.\n", CIT_OK, success);
 506                 lprintf(CTDL_NOTICE, "Mailing list: %s %ssubscribed to %s with token %s\n", email, (strlen(address_to_unsubscribe) > 0) ? "un" : "", room, token);
 507         }
 508         else {
 509                 cprintf("%d Invalid token.\n", ERROR + ILLEGAL_VALUE);
 510         }
 511
 512 }
 513
 514
 515
 516 /*
 517  * process subscribe/unsubscribe requests and confirmations
 518  */
 519 void cmd_subs(char *cmdbuf) {
 520
 521         char opr[256];
 522         char room[ROOMNAMELEN];
 523         char email[256];
 524         char subtype[256];
 525         char token[256];
 526         char webpage[256];
 527
 528         extract_token(opr, cmdbuf, 0, '|', sizeof opr);
 529         if (!strcasecmp(opr, "subscribe")) {
 530                 extract_token(subtype, cmdbuf, 3, '|', sizeof subtype);
 531                 if ( (strcasecmp(subtype, "list"))
 532                    && (strcasecmp(subtype, "digest")) ) {
 533                         cprintf("%d Invalid subscription type '%s'\n",
 534                                 ERROR + ILLEGAL_VALUE, subtype);
 535                 }
 536                 else {
 537                         extract_token(room, cmdbuf, 1, '|', sizeof room);
 538                         extract_token(email, cmdbuf, 2, '|', sizeof email);
 539                         extract_token(webpage, cmdbuf, 4, '|', sizeof webpage);
 540                         do_subscribe(room, email, subtype, webpage);
 541                 }
 542         }
 543         else if (!strcasecmp(opr, "unsubscribe")) {
 544                 extract_token(room, cmdbuf, 1, '|', sizeof room);
 545                 extract_token(email, cmdbuf, 2, '|', sizeof email);
 546                 extract_token(webpage, cmdbuf, 3, '|', sizeof webpage);
 547                 do_unsubscribe(room, email, webpage);
 548         }
 549         else if (!strcasecmp(opr, "confirm")) {
 550                 extract_token(room, cmdbuf, 1, '|', sizeof room);
 551                 extract_token(token, cmdbuf, 2, '|', sizeof token);
 552                 do_confirm(room, token);
 553         }
 554         else {
 555                 cprintf("%d Invalid command\n", ERROR + ILLEGAL_VALUE);
 556         }
 557 }
 558
 559
 560 /*
 561  * Module entry point
 562  */
 563 char *serv_listsub_init(void)
 564 {
 565         CtdlRegisterProtoHook(cmd_subs, "SUBS", "List subscribe/unsubscribe");
 566         return "$Id$";
 567 }