citadel/modules/imap/serv_imap.c

   1 /*
   2  * IMAP server for the Citadel system
   3  *
   4  * Copyright (C) 2000-2011 by Art Cancro and others.
   5  * This code is released under the terms of the GNU General Public License.
   6  *
   7  * WARNING: the IMAP protocol is badly designed.  No implementation of it
   8  * is perfect.  Indeed, with so much gratuitous complexity, *all* IMAP
   9  * implementations have bugs.
  10  *
  11  * This program is open source software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #include "sysdep.h"
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29 #include <stdio.h>
  30 #include <fcntl.h>
  31 #include <signal.h>
  32 #include <pwd.h>
  33 #include <errno.h>
  34 #include <sys/types.h>
  35
  36 #if TIME_WITH_SYS_TIME
  37 # include <sys/time.h>
  38 # include <time.h>
  39 #else
  40 # if HAVE_SYS_TIME_H
  41 #  include <sys/time.h>
  42 # else
  43 #  include <time.h>
  44 # endif
  45 #endif
  46
  47 #include <sys/wait.h>
  48 #include <ctype.h>
  49 #include <string.h>
  50 #include <limits.h>
  51 #include <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "user_ops.h"
  58 #include "database.h"
  59 #include "msgbase.h"
  60 #include "internet_addressing.h"
  61 #include "serv_imap.h"
  62 #include "imap_tools.h"
  63 #include "imap_list.h"
  64 #include "imap_fetch.h"
  65 #include "imap_search.h"
  66 #include "imap_store.h"
  67 #include "imap_acl.h"
  68 #include "imap_metadata.h"
  69 #include "imap_misc.h"
  70
  71 #include "ctdl_module.h"
  72 int IMAPDebugEnabled = 0;
  73 HashList *ImapCmds = NULL;
  74 void registerImapCMD(const char *First, long FLen,
  75                      const char *Second, long SLen,
  76                      imap_handler H,
  77                      int Flags)
  78 {
  79         imap_handler_hook *h;
  80
  81         h = (imap_handler_hook*) malloc(sizeof(imap_handler_hook));
  82         memset(h, 0, sizeof(imap_handler_hook));
  83
  84         h->Flags = Flags;
  85         h->h = H;
  86         if (SLen == 0) {
  87                 Put(ImapCmds, First, FLen, h, NULL);
  88         }
  89         else {
  90                 char CMD[SIZ];
  91                 memcpy(CMD, First, FLen);
  92                 memcpy(CMD+FLen, Second, SLen);
  93                 CMD[FLen+SLen] = '\0';
  94                 Put(ImapCmds, CMD, FLen + SLen, h, NULL);
  95         }
  96 }
  97
  98 void imap_cleanup(void)
  99 {
 100         DeleteHash(&ImapCmds);
 101 }
 102
 103 const imap_handler_hook *imap_lookup(int num_parms, ConstStr *Params)
 104 {
 105         struct CitContext *CCC = CC;
 106         void *v;
 107         citimap *Imap = CCCIMAP;
 108
 109         if (num_parms < 1)
 110                 return NULL;
 111
 112         /* we abuse the Reply-buffer for uppercasing... */
 113         StrBufPlain(Imap->Reply, CKEY(Params[1]));
 114         StrBufUpCase(Imap->Reply);
 115
 116         IMAP_syslog(LOG_DEBUG, "---- Looking up [%s] -----",
 117                       ChrPtr(Imap->Reply));
 118         if (GetHash(ImapCmds, SKEY(Imap->Reply), &v))
 119         {
 120                 IMAPM_syslog(LOG_DEBUG, "Found.");
 121                 FlushStrBuf(Imap->Reply);
 122                 return (imap_handler_hook *) v;
 123         }
 124
 125         if (num_parms == 1)
 126         {
 127                 IMAPM_syslog(LOG_DEBUG, "NOT Found.");
 128                 FlushStrBuf(Imap->Reply);
 129                 return NULL;
 130         }
 131
 132         IMAP_syslog(LOG_DEBUG, "---- Looking up [%s] -----",
 133                       ChrPtr(Imap->Reply));
 134         StrBufAppendBufPlain(Imap->Reply, CKEY(Params[2]), 0);
 135         StrBufUpCase(Imap->Reply);
 136         if (GetHash(ImapCmds, SKEY(Imap->Reply), &v))
 137         {
 138                 IMAPM_syslog(LOG_DEBUG, "Found.");
 139                 FlushStrBuf(Imap->Reply);
 140                 return (imap_handler_hook *) v;
 141         }
 142         IMAPM_syslog(LOG_DEBUG, "NOT Found.");
 143         FlushStrBuf(Imap->Reply);
 144         return NULL;
 145 }
 146
 147 /* imap_rename() uses this struct containing list of rooms to rename */
 148 struct irl {
 149         struct irl *next;
 150         char irl_oldroom[ROOMNAMELEN];
 151         char irl_newroom[ROOMNAMELEN];
 152         int irl_newfloor;
 153 };
 154
 155 /* Data which is passed between imap_rename() and imap_rename_backend() */
 156 typedef struct __irlparms {
 157         const char *oldname;
 158         long oldnamelen;
 159         const char *newname;
 160         long newnamelen;
 161         struct irl **irl;
 162 }irlparms;
 163
 164
 165 /*
 166  * If there is a message ID map in memory, free it
 167  */
 168 void imap_free_msgids(void)
 169 {
 170         citimap *Imap = IMAP;
 171         if (Imap->msgids != NULL) {
 172                 free(Imap->msgids);
 173                 Imap->msgids = NULL;
 174                 Imap->num_msgs = 0;
 175                 Imap->num_alloc = 0;
 176         }
 177         if (Imap->flags != NULL) {
 178                 free(Imap->flags);
 179                 Imap->flags = NULL;
 180         }
 181         Imap->last_mtime = (-1);
 182 }
 183
 184
 185 /*
 186  * If there is a transmitted message in memory, free it
 187  */
 188 void imap_free_transmitted_message(void)
 189 {
 190         FreeStrBuf(&IMAP->TransmittedMessage);
 191 }
 192
 193
 194 /*
 195  * Set the \Seen, \Recent. and \Answered flags, based on the sequence
 196  * sets stored in the visit record for this user/room.  Note that we have
 197  * to parse each sequence set manually here, because calling the utility
 198  * function is_msg_in_sequence_set() over and over again is too expensive.
 199  *
 200  * first_msg should be set to 0 to rescan the flags for every message in the
 201  * room, or some other value if we're only interested in an incremental
 202  * update.
 203  */
 204 void imap_set_seen_flags(int first_msg)
 205 {
 206         citimap *Imap = IMAP;
 207         visit vbuf;
 208         int i;
 209         int num_sets;
 210         int s;
 211         char setstr[64], lostr[64], histr[64];
 212         long lo, hi;
 213
 214         if (Imap->num_msgs < 1) return;
 215         CtdlGetRelationship(&vbuf, &CC->user, &CC->room);
 216
 217         for (i = first_msg; i < Imap->num_msgs; ++i) {
 218                 Imap->flags[i] = Imap->flags[i] & ~IMAP_SEEN;
 219                 Imap->flags[i] |= IMAP_RECENT;
 220                 Imap->flags[i] = Imap->flags[i] & ~IMAP_ANSWERED;
 221         }
 222
 223         /*
 224          * Do the "\Seen" flag.
 225          * (Any message not "\Seen" is considered "\Recent".)
 226          */
 227         num_sets = num_tokens(vbuf.v_seen, ',');
 228         for (s=0; s<num_sets; ++s) {
 229                 extract_token(setstr, vbuf.v_seen, s, ',', sizeof setstr);
 230
 231                 extract_token(lostr, setstr, 0, ':', sizeof lostr);
 232                 if (num_tokens(setstr, ':') >= 2) {
 233                         extract_token(histr, setstr, 1, ':', sizeof histr);
 234                         if (!strcmp(histr, "*")) {
 235                                 snprintf(histr, sizeof histr, "%ld", LONG_MAX);
 236                         }
 237                 }
 238                 else {
 239                         strcpy(histr, lostr);
 240                 }
 241                 lo = atol(lostr);
 242                 hi = atol(histr);
 243
 244                 for (i = first_msg; i < Imap->num_msgs; ++i) {
 245                         if ((Imap->msgids[i] >= lo) && (Imap->msgids[i] <= hi)){
 246                                 Imap->flags[i] |= IMAP_SEEN;
 247                                 Imap->flags[i] = Imap->flags[i] & ~IMAP_RECENT;
 248                         }
 249                 }
 250         }
 251
 252         /* Do the ANSWERED flag */
 253         num_sets = num_tokens(vbuf.v_answered, ',');
 254         for (s=0; s<num_sets; ++s) {
 255                 extract_token(setstr, vbuf.v_answered, s, ',', sizeof setstr);
 256
 257                 extract_token(lostr, setstr, 0, ':', sizeof lostr);
 258                 if (num_tokens(setstr, ':') >= 2) {
 259                         extract_token(histr, setstr, 1, ':', sizeof histr);
 260                         if (!strcmp(histr, "*")) {
 261                                 snprintf(histr, sizeof histr, "%ld", LONG_MAX);
 262                         }
 263                 }
 264                 else {
 265                         strcpy(histr, lostr);
 266                 }
 267                 lo = atol(lostr);
 268                 hi = atol(histr);
 269
 270                 for (i = first_msg; i < Imap->num_msgs; ++i) {
 271                         if ((Imap->msgids[i] >= lo) && (Imap->msgids[i] <= hi)){
 272                                 Imap->flags[i] |= IMAP_ANSWERED;
 273                         }
 274                 }
 275         }
 276
 277 }
 278
 279
 280
 281 /*
 282  * Back end for imap_load_msgids()
 283  *
 284  * Optimization: instead of calling realloc() to add each message, we
 285  * allocate space in the list for REALLOC_INCREMENT messages at a time.  This
 286  * allows the mapping to proceed much faster.
 287  */
 288 void imap_add_single_msgid(long msgnum, void *userdata)
 289 {
 290         citimap *Imap = IMAP;
 291
 292         ++Imap->num_msgs;
 293         if (Imap->num_msgs > Imap->num_alloc) {
 294                 Imap->num_alloc += REALLOC_INCREMENT;
 295                 Imap->msgids = realloc(Imap->msgids, (Imap->num_alloc * sizeof(long)) );
 296                 Imap->flags = realloc(Imap->flags, (Imap->num_alloc * sizeof(unsigned int)) );
 297         }
 298         Imap->msgids[Imap->num_msgs - 1] = msgnum;
 299         Imap->flags[Imap->num_msgs - 1] = 0;
 300 }
 301
 302
 303
 304 /*
 305  * Set up a message ID map for the current room (folder)
 306  */
 307 void imap_load_msgids(void)
 308 {
 309         struct CitContext *CCC = CC;
 310         struct cdbdata *cdbfr;
 311         citimap *Imap = CCCIMAP;
 312
 313         if (Imap->selected == 0) {
 314                 IMAPM_syslog(LOG_ERR, "imap_load_msgids() can't run; no room selected");
 315                 return;
 316         }
 317
 318         imap_free_msgids();     /* If there was already a map, free it */
 319
 320         /* Load the message list */
 321         cdbfr = cdb_fetch(CDB_MSGLISTS, &CC->room.QRnumber, sizeof(long));
 322         if (cdbfr != NULL) {
 323                 Imap->msgids = (long*)cdbfr->ptr;
 324                 Imap->num_msgs = cdbfr->len / sizeof(long);
 325                 Imap->num_alloc = cdbfr->len / sizeof(long);
 326                 cdbfr->ptr = NULL;
 327                 cdbfr->len = 0;
 328                 cdb_free(cdbfr);
 329         }
 330
 331         if (Imap->num_msgs) {
 332                 Imap->flags = malloc(Imap->num_alloc * sizeof(unsigned int));
 333                 memset(Imap->flags, 0, (Imap->num_alloc * sizeof(unsigned int)) );
 334         }
 335
 336         imap_set_seen_flags(0);
 337 }
 338
 339
 340 /*
 341  * Re-scan the selected room (folder) and see if it's been changed at all
 342  */
 343 void imap_rescan_msgids(void)
 344 {
 345         struct CitContext *CCC = CC;
 346         citimap *Imap = CCCIMAP;
 347         int original_num_msgs = 0;
 348         long original_highest = 0L;
 349         int i, j, jstart;
 350         int message_still_exists;
 351         struct cdbdata *cdbfr;
 352         long *msglist = NULL;
 353         int num_msgs = 0;
 354         int num_recent = 0;
 355
 356         if (Imap->selected == 0) {
 357                 IMAPM_syslog(LOG_ERR, "imap_load_msgids() can't run; no room selected");
 358                 return;
 359         }
 360
 361         /*
 362          * Check to see if the room's contents have changed.
 363          * If not, we can avoid this rescan.
 364          */
 365         CtdlGetRoom(&CC->room, CC->room.QRname);
 366         if (Imap->last_mtime == CC->room.QRmtime) {     /* No changes! */
 367                 return;
 368         }
 369
 370         /* Load the *current* message list from disk, so we can compare it
 371          * to what we have in memory.
 372          */
 373         cdbfr = cdb_fetch(CDB_MSGLISTS, &CC->room.QRnumber, sizeof(long));
 374         if (cdbfr != NULL) {
 375                 msglist = (long*)cdbfr->ptr;
 376                 cdbfr->ptr = NULL;
 377                 num_msgs = cdbfr->len / sizeof(long);
 378                 cdbfr->len = 0;
 379                 cdb_free(cdbfr);
 380         } else {
 381                 num_msgs = 0;
 382         }
 383
 384         /*
 385          * Check to see if any of the messages we know about have been expunged
 386          */
 387         if (Imap->num_msgs > 0) {
 388                 jstart = 0;
 389                 for (i = 0; i < Imap->num_msgs; ++i) {
 390
 391                         message_still_exists = 0;
 392                         if (num_msgs > 0) {
 393                                 for (j = jstart; j < num_msgs; ++j) {
 394                                         if (msglist[j] == Imap->msgids[i]) {
 395                                                 message_still_exists = 1;
 396                                                 jstart = j;
 397                                                 break;
 398                                         }
 399                                 }
 400                         }
 401
 402                         if (message_still_exists == 0) {
 403                                 IAPrintf("* %d EXPUNGE\r\n", i + 1);
 404
 405                                 /* Here's some nice stupid nonsense.  When a
 406                                  * message is expunged, we have to slide all
 407                                  * the existing messages up in the message
 408                                  * array.
 409                                  */
 410                                 --Imap->num_msgs;
 411                                 memmove(&Imap->msgids[i],
 412                                         &Imap->msgids[i + 1],
 413                                         (sizeof(long) *
 414                                          (Imap->num_msgs - i)));
 415                                 memmove(&Imap->flags[i],
 416                                         &Imap->flags[i + 1],
 417                                         (sizeof(unsigned int) *
 418                                          (Imap->num_msgs - i)));
 419                                 --i;
 420                         }
 421
 422                 }
 423         }
 424
 425         /*
 426          * Remember how many messages were here before we re-scanned.
 427          */
 428         original_num_msgs = Imap->num_msgs;
 429         if (Imap->num_msgs > 0) {
 430                 original_highest = Imap->msgids[Imap->num_msgs - 1];
 431         } else {
 432                 original_highest = 0L;
 433         }
 434
 435         /*
 436          * Now peruse the room for *new* messages only.
 437          * This logic is probably the cause of Bug # 368
 438          * [ http://bugzilla.citadel.org/show_bug.cgi?id=368 ]
 439          */
 440         if (num_msgs > 0) {
 441                 for (j = 0; j < num_msgs; ++j) {
 442                         if (msglist[j] > original_highest) {
 443                                 imap_add_single_msgid(msglist[j], NULL);
 444                         }
 445                 }
 446         }
 447         imap_set_seen_flags(original_num_msgs);
 448
 449         /*
 450          * If new messages have arrived, tell the client about them.
 451          */
 452         if (Imap->num_msgs > original_num_msgs) {
 453
 454                 for (j = 0; j < num_msgs; ++j) {
 455                         if (Imap->flags[j] & IMAP_RECENT) {
 456                                 ++num_recent;
 457                         }
 458                 }
 459
 460                 IAPrintf("* %d EXISTS\r\n", Imap->num_msgs);
 461                 IAPrintf("* %d RECENT\r\n", num_recent);
 462         }
 463
 464         if (msglist != NULL) {
 465                 free(msglist);
 466         }
 467         Imap->last_mtime = CC->room.QRmtime;
 468 }
 469
 470
 471 /*
 472  * This cleanup function blows away the temporary memory and files used by
 473  * the IMAP server.
 474  */
 475 void imap_cleanup_function(void)
 476 {
 477         struct CitContext *CCC = CC;
 478         citimap *Imap = CCCIMAP;
 479
 480         /* Don't do this stuff if this is not a Imap session! */
 481         if (CC->h_command_function != imap_command_loop)
 482                 return;
 483
 484         /* If there is a mailbox selected, auto-expunge it. */
 485         if (Imap->selected) {
 486                 imap_do_expunge();
 487         }
 488
 489         IMAPM_syslog(LOG_DEBUG, "Performing IMAP cleanup hook");
 490         imap_free_msgids();
 491         imap_free_transmitted_message();
 492
 493         if (Imap->cached_rfc822 != NULL) {
 494                 FreeStrBuf(&Imap->cached_rfc822);
 495                 Imap->cached_rfc822_msgnum = (-1);
 496                 Imap->cached_rfc822_withbody = 0;
 497         }
 498
 499         if (Imap->cached_body != NULL) {
 500                 free(Imap->cached_body);
 501                 Imap->cached_body = NULL;
 502                 Imap->cached_body_len = 0;
 503                 Imap->cached_bodymsgnum = (-1);
 504         }
 505         FreeStrBuf(&Imap->Cmd.CmdBuf);
 506         FreeStrBuf(&Imap->Reply);
 507         if (Imap->Cmd.Params != NULL) free(Imap->Cmd.Params);
 508         free(Imap);
 509         IMAPM_syslog(LOG_DEBUG, "Finished IMAP cleanup hook");
 510 }
 511
 512
 513 /*
 514  * Does the actual work of the CAPABILITY command (because we need to
 515  * output this stuff in other places as well)
 516  */
 517 void imap_output_capability_string(void) {
 518         IAPuts("CAPABILITY IMAP4REV1 NAMESPACE ID AUTH=PLAIN AUTH=LOGIN UIDPLUS");
 519
 520 #ifdef HAVE_OPENSSL
 521         if (!CC->redirect_ssl) IAPuts(" STARTTLS");
 522 #endif
 523
 524 #ifndef DISABLE_IMAP_ACL
 525         IAPuts(" ACL");
 526 #endif
 527
 528         /* We are building a partial implementation of METADATA for the sole purpose
 529          * of interoperating with the ical/vcard version of the Bynari Insight Connector.
 530          * It is not a full RFC5464 implementation, but it should refuse non-Bynari
 531          * metadata in a compatible and graceful way.
 532          */
 533         IAPuts(" METADATA");
 534
 535         /*
 536          * LIST-EXTENDED was originally going to be required by the METADATA extension.
 537          * It was mercifully removed prior to the finalization of RFC5464.  We started
 538          * implementing this but stopped when we learned that it would not be needed.
 539          * If you uncomment this declaration you are responsible for writing a lot of new
 540          * code.
 541          *
 542          * IAPuts(" LIST-EXTENDED")
 543          */
 544 }
 545
 546
 547 /*
 548  * implements the CAPABILITY command
 549  */
 550 void imap_capability(int num_parms, ConstStr *Params)
 551 {
 552         IAPuts("* ");
 553         imap_output_capability_string();
 554         IAPuts("\r\n");
 555         IReply("OK CAPABILITY completed");
 556 }
 557
 558
 559 /*
 560  * Implements the ID command (specified by RFC2971)
 561  *
 562  * We ignore the client-supplied information, and output a NIL response.
 563  * Although this is technically a valid implementation of the extension, it
 564  * is quite useless.  It exists only so that we may see which clients are
 565  * making use of this extension.
 566  *
 567  */
 568 void imap_id(int num_parms, ConstStr *Params)
 569 {
 570         IAPuts("* ID NIL\r\n");
 571         IReply("OK ID completed");
 572 }
 573
 574
 575 /*
 576  * Here's where our IMAP session begins its happy day.
 577  */
 578 void imap_greeting(void)
 579 {
 580         citimap *Imap;
 581         CitContext *CCC = CC;
 582
 583         strcpy(CCC->cs_clientname, "IMAP session");
 584         CCC->session_specific_data = malloc(sizeof(citimap));
 585         Imap = (citimap *)CCC->session_specific_data;
 586         memset(Imap, 0, sizeof(citimap));
 587         Imap->authstate = imap_as_normal;
 588         Imap->cached_rfc822_msgnum = (-1);
 589         Imap->cached_rfc822_withbody = 0;
 590         Imap->Reply = NewStrBufPlain(NULL, SIZ * 10); /* 40k */
 591
 592         if (CCC->nologin)
 593         {
 594                 IAPuts("* BYE; Server busy, try later\r\n");
 595                 CCC->kill_me = KILLME_NOLOGIN;
 596                 IUnbuffer();
 597                 return;
 598         }
 599
 600         IAPuts("* OK [");
 601         imap_output_capability_string();
 602         IAPrintf("] %s IMAP4rev1 %s ready\r\n", config.c_fqdn, CITADEL);
 603         IUnbuffer();
 604 }
 605
 606
 607 /*
 608  * IMAPS is just like IMAP, except it goes crypto right away.
 609  */
 610 void imaps_greeting(void) {
 611         CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 612 #ifdef HAVE_OPENSSL
 613         if (!CC->redirect_ssl) CC->kill_me = KILLME_NO_CRYPTO;          /* kill session if no crypto */
 614 #endif
 615         imap_greeting();
 616 }
 617
 618
 619 /*
 620  * implements the LOGIN command (ordinary username/password login)
 621  */
 622 void imap_login(int num_parms, ConstStr *Params)
 623 {
 624
 625         switch (num_parms) {
 626         case 3:
 627                 if (Params[2].Key[0] == '{') {
 628                         IAPuts("+ go ahead\r\n");
 629                         IMAP->authstate = imap_as_expecting_multilineusername;
 630                         strcpy(IMAP->authseq, Params[0].Key);
 631                         return;
 632                 }
 633                 else {
 634                         IReply("BAD incorrect number of parameters");
 635                         return;
 636                 }
 637         case 4:
 638                 if (CtdlLoginExistingUser(NULL, Params[2].Key) == login_ok) {
 639                         if (CtdlTryPassword(Params[3].Key, Params[3].len) == pass_ok) {
 640                                 /* hm, thats not doable by IReply :-( */
 641                                 IAPrintf("%s OK [", Params[0].Key);
 642                                 imap_output_capability_string();
 643                                 IAPrintf("] Hello, %s\r\n", CC->user.fullname);
 644                                 return;
 645                         }
 646                         else
 647                         {
 648                                 IReplyPrintf("NO AUTHENTICATE %s failed",
 649                                              Params[3].Key);
 650                         }
 651                 }
 652
 653                 IReply("BAD Login incorrect");
 654         default:
 655                 IReply("BAD incorrect number of parameters");
 656                 return;
 657         }
 658
 659 }
 660
 661
 662 /*
 663  * Implements the AUTHENTICATE command
 664  */
 665 void imap_authenticate(int num_parms, ConstStr *Params)
 666 {
 667         char UsrBuf[SIZ];
 668
 669         if (num_parms != 3) {
 670                 IReply("BAD incorrect number of parameters");
 671                 return;
 672         }
 673
 674         if (CC->logged_in) {
 675                 IReply("BAD Already logged in.");
 676                 return;
 677         }
 678
 679         if (!strcasecmp(Params[2].Key, "LOGIN")) {
 680                 CtdlEncodeBase64(UsrBuf, "Username:", 9, 0);
 681                 IAPrintf("+ %s\r\n", UsrBuf);
 682                 IMAP->authstate = imap_as_expecting_username;
 683                 strcpy(IMAP->authseq, Params[0].Key);
 684                 return;
 685         }
 686
 687         if (!strcasecmp(Params[2].Key, "PLAIN")) {
 688                 // CtdlEncodeBase64(UsrBuf, "Username:", 9, 0);
 689                 // IAPuts("+ %s\r\n", UsrBuf);
 690                 IAPuts("+ \r\n");
 691                 IMAP->authstate = imap_as_expecting_plainauth;
 692                 strcpy(IMAP->authseq, Params[0].Key);
 693                 return;
 694         }
 695
 696         else {
 697                 IReplyPrintf("NO AUTHENTICATE %s failed",
 698                              Params[1].Key);
 699         }
 700 }
 701
 702
 703 void imap_auth_plain(void)
 704 {
 705         citimap *Imap = IMAP;
 706         const char *decoded_authstring;
 707         char ident[256];
 708         char user[256];
 709         char pass[256];
 710         int result;
 711         long len;
 712
 713         memset(pass, 0, sizeof(pass));
 714         StrBufDecodeBase64(Imap->Cmd.CmdBuf);
 715
 716         decoded_authstring = ChrPtr(Imap->Cmd.CmdBuf);
 717         safestrncpy(ident, decoded_authstring, sizeof ident);
 718         safestrncpy(user, &decoded_authstring[strlen(ident) + 1], sizeof user);
 719         len = safestrncpy(pass, &decoded_authstring[strlen(ident) + strlen(user) + 2], sizeof pass);
 720         if (len < 0)
 721                 len = sizeof(pass) - 1;
 722
 723         Imap->authstate = imap_as_normal;
 724
 725         if (!IsEmptyStr(ident)) {
 726                 result = CtdlLoginExistingUser(user, ident);
 727         }
 728         else {
 729                 result = CtdlLoginExistingUser(NULL, user);
 730         }
 731
 732         if (result == login_ok) {
 733                 if (CtdlTryPassword(pass, len) == pass_ok) {
 734                         IAPrintf("%s OK authentication succeeded\r\n", Imap->authseq);
 735                         return;
 736                 }
 737         }
 738         IAPrintf("%s NO authentication failed\r\n", Imap->authseq);
 739 }
 740
 741
 742 void imap_auth_login_user(long state)
 743 {
 744         char PWBuf[SIZ];
 745         citimap *Imap = IMAP;
 746
 747         switch (state){
 748         case imap_as_expecting_username:
 749                 StrBufDecodeBase64(Imap->Cmd.CmdBuf);
 750                 CtdlLoginExistingUser(NULL, ChrPtr(Imap->Cmd.CmdBuf));
 751                 CtdlEncodeBase64(PWBuf, "Password:", 9, 0);
 752                 IAPrintf("+ %s\r\n", PWBuf);
 753
 754                 Imap->authstate = imap_as_expecting_password;
 755                 return;
 756         case imap_as_expecting_multilineusername:
 757                 extract_token(PWBuf, ChrPtr(Imap->Cmd.CmdBuf), 1, ' ', sizeof(PWBuf));
 758                 CtdlLoginExistingUser(NULL, ChrPtr(Imap->Cmd.CmdBuf));
 759                 IAPuts("+ go ahead\r\n");
 760                 Imap->authstate = imap_as_expecting_multilinepassword;
 761                 return;
 762         }
 763 }
 764
 765
 766 void imap_auth_login_pass(long state)
 767 {
 768         citimap *Imap = IMAP;
 769         const char *pass = NULL;
 770         long len = 0;
 771
 772         switch (state) {
 773         default:
 774         case imap_as_expecting_password:
 775                 StrBufDecodeBase64(Imap->Cmd.CmdBuf);
 776                 pass = ChrPtr(Imap->Cmd.CmdBuf);
 777                 len = StrLength(Imap->Cmd.CmdBuf);
 778                 break;
 779         case imap_as_expecting_multilinepassword:
 780                 pass = ChrPtr(Imap->Cmd.CmdBuf);
 781                 len = StrLength(Imap->Cmd.CmdBuf);
 782                 break;
 783         }
 784         if (len > USERNAME_SIZE)
 785                 StrBufCutAt(Imap->Cmd.CmdBuf, USERNAME_SIZE, NULL);
 786
 787         if (CtdlTryPassword(pass, len) == pass_ok) {
 788                 IAPrintf("%s OK authentication succeeded\r\n", Imap->authseq);
 789         } else {
 790                 IAPrintf("%s NO authentication failed\r\n", Imap->authseq);
 791         }
 792         Imap->authstate = imap_as_normal;
 793         return;
 794 }
 795
 796
 797 /*
 798  * implements the STARTTLS command (Citadel API version)
 799  */
 800 void imap_starttls(int num_parms, ConstStr *Params)
 801 {
 802         char ok_response[SIZ];
 803         char nosup_response[SIZ];
 804         char error_response[SIZ];
 805
 806         snprintf(ok_response, SIZ,      "%s OK begin TLS negotiation now\r\n",  Params[0].Key);
 807         snprintf(nosup_response, SIZ,   "%s NO TLS not supported here\r\n",     Params[0].Key);
 808         snprintf(error_response, SIZ,   "%s BAD Internal error\r\n",            Params[0].Key);
 809         CtdlModuleStartCryptoMsgs(ok_response, nosup_response, error_response);
 810 }
 811
 812
 813 /*
 814  * implements the SELECT command
 815  */
 816 void imap_select(int num_parms, ConstStr *Params)
 817 {
 818         citimap *Imap = IMAP;
 819         char towhere[ROOMNAMELEN];
 820         char augmented_roomname[ROOMNAMELEN];
 821         int c = 0;
 822         int ok = 0;
 823         int ra = 0;
 824         struct ctdlroom QRscratch;
 825         int msgs, new;
 826         int i;
 827
 828         /* Convert the supplied folder name to a roomname */
 829         i = imap_roomname(towhere, sizeof towhere, Params[2].Key);
 830         if (i < 0) {
 831                 IReply("NO Invalid mailbox name.");
 832                 Imap->selected = 0;
 833                 return;
 834         }
 835
 836         /* First try a regular match */
 837         c = CtdlGetRoom(&QRscratch, towhere);
 838
 839         /* Then try a mailbox name match */
 840         if (c != 0) {
 841                 CtdlMailboxName(augmented_roomname, sizeof augmented_roomname, &CC->user, towhere);
 842                 c = CtdlGetRoom(&QRscratch, augmented_roomname);
 843                 if (c == 0) {
 844                         safestrncpy(towhere, augmented_roomname, sizeof(towhere));
 845                 }
 846         }
 847
 848         /* If the room exists, check security/access */
 849         if (c == 0) {
 850                 /* See if there is an existing user/room relationship */
 851                 CtdlRoomAccess(&QRscratch, &CC->user, &ra, NULL);
 852
 853                 /* normal clients have to pass through security */
 854                 if (ra & UA_KNOWN) {
 855                         ok = 1;
 856                 }
 857         }
 858
 859         /* Fail here if no such room */
 860         if (!ok) {
 861                 IReply("NO ... no such room, or access denied");
 862                 return;
 863         }
 864
 865         /* If we already had some other folder selected, auto-expunge it */
 866         imap_do_expunge();
 867
 868         /*
 869          * CtdlUserGoto() formally takes us to the desired room, happily returning
 870          * the number of messages and number of new messages.
 871          */
 872         memcpy(&CC->room, &QRscratch, sizeof(struct ctdlroom));
 873         CtdlUserGoto(NULL, 0, 0, &msgs, &new);
 874         Imap->selected = 1;
 875
 876         if (!strcasecmp(Params[1].Key, "EXAMINE")) {
 877                 Imap->readonly = 1;
 878         } else {
 879                 Imap->readonly = 0;
 880         }
 881
 882         imap_load_msgids();
 883         Imap->last_mtime = CC->room.QRmtime;
 884
 885         IAPrintf("* %d EXISTS\r\n", msgs);
 886         IAPrintf("* %d RECENT\r\n", new);
 887
 888         IAPrintf("* OK [UIDVALIDITY %ld] UID validity status\r\n", GLOBAL_UIDVALIDITY_VALUE);
 889         IAPrintf("* OK [UIDNEXT %ld] Predicted next UID\r\n", CitControl.MMhighest + 1);
 890
 891         /* Technically, \Deleted is a valid flag, but not a permanent flag,
 892          * because we don't maintain its state across sessions.  Citadel
 893          * automatically expunges mailboxes when they are de-selected.
 894          *
 895          * Unfortunately, omitting \Deleted as a PERMANENTFLAGS flag causes
 896          * some clients (particularly Thunderbird) to misbehave -- they simply
 897          * elect not to transmit the flag at all.  So we have to advertise
 898          * \Deleted as a PERMANENTFLAGS flag, even though it technically isn't.
 899          */
 900         IAPuts("* FLAGS (\\Deleted \\Seen \\Answered)\r\n");
 901         IAPuts("* OK [PERMANENTFLAGS (\\Deleted \\Seen \\Answered)] permanent flags\r\n");
 902
 903         IReplyPrintf("OK [%s] %s completed",
 904                 (Imap->readonly ? "READ-ONLY" : "READ-WRITE"), Params[1].Key
 905         );
 906 }
 907
 908
 909 /*
 910  * Does the real work for expunge.
 911  */
 912 int imap_do_expunge(void)
 913 {
 914         struct CitContext *CCC = CC;
 915         citimap *Imap = CCCIMAP;
 916         int i;
 917         int num_expunged = 0;
 918         long *delmsgs = NULL;
 919         int num_delmsgs = 0;
 920
 921         IMAPM_syslog(LOG_DEBUG, "imap_do_expunge() called");
 922         if (Imap->selected == 0) {
 923                 return (0);
 924         }
 925
 926         if (Imap->num_msgs > 0) {
 927                 delmsgs = malloc(Imap->num_msgs * sizeof(long));
 928                 for (i = 0; i < Imap->num_msgs; ++i) {
 929                         if (Imap->flags[i] & IMAP_DELETED) {
 930                                 delmsgs[num_delmsgs++] = Imap->msgids[i];
 931                         }
 932                 }
 933                 if (num_delmsgs > 0) {
 934                         CtdlDeleteMessages(CC->room.QRname, delmsgs, num_delmsgs, "");
 935                 }
 936                 num_expunged += num_delmsgs;
 937                 free(delmsgs);
 938         }
 939
 940         if (num_expunged > 0) {
 941                 imap_rescan_msgids();
 942         }
 943
 944         IMAP_syslog(LOG_DEBUG, "Expunged %d messages from <%s>", num_expunged, CC->room.QRname);
 945         return (num_expunged);
 946 }
 947
 948
 949 /*
 950  * implements the EXPUNGE command syntax
 951  */
 952 void imap_expunge(int num_parms, ConstStr *Params)
 953 {
 954         int num_expunged = 0;
 955
 956         num_expunged = imap_do_expunge();
 957         IReplyPrintf("OK expunged %d messages.", num_expunged);
 958 }
 959
 960
 961 /*
 962  * implements the CLOSE command
 963  */
 964 void imap_close(int num_parms, ConstStr *Params)
 965 {
 966
 967         /* Yes, we always expunge on close. */
 968         if (IMAP->selected) {
 969                 imap_do_expunge();
 970         }
 971
 972         IMAP->selected = 0;
 973         IMAP->readonly = 0;
 974         imap_free_msgids();
 975         IReply("OK CLOSE completed");
 976 }
 977
 978
 979 /*
 980  * Implements the NAMESPACE command.
 981  */
 982 void imap_namespace(int num_parms, ConstStr *Params)
 983 {
 984         int i;
 985         struct floor *fl;
 986         int floors = 0;
 987         char Namespace[SIZ];
 988
 989         IAPuts("* NAMESPACE ");
 990
 991         /* All personal folders are subordinate to INBOX. */
 992         IAPuts("((\"INBOX/\" \"/\")) ");
 993
 994         /* Other users' folders ... coming soon! FIXME */
 995         IAPuts("NIL ");
 996
 997         /* Show all floors as shared namespaces.  Neato! */
 998         IAPuts("(");
 999         for (i = 0; i < MAXFLOORS; ++i) {
1000                 fl = CtdlGetCachedFloor(i);
1001                 if (fl->f_flags & F_INUSE) {
1002                         /* if (floors > 0) IAPuts(" "); samjam says this confuses javamail */
1003                         IAPuts("(");
1004                         snprintf(Namespace, sizeof(Namespace), "%s/", fl->f_name);
1005                         plain_imap_strout(Namespace);
1006                         IAPuts(" \"/\")");
1007                         ++floors;
1008                 }
1009         }
1010         IAPuts(")");
1011
1012         /* Wind it up with a newline and a completion message. */
1013         IAPuts("\r\n");
1014         IReply("OK NAMESPACE completed");
1015 }
1016
1017
1018 /*
1019  * Implements the CREATE command
1020  *
1021  */
1022 void imap_create(int num_parms, ConstStr *Params)
1023 {
1024         struct CitContext *CCC = CC;
1025         int ret;
1026         char roomname[ROOMNAMELEN];
1027         int floornum;
1028         int flags;
1029         int newroomtype = 0;
1030         int newroomview = 0;
1031         char *notification_message = NULL;
1032
1033         if (num_parms < 3) {
1034                 IReply("NO A foder name must be specified");
1035                 return;
1036         }
1037
1038         if (strchr(Params[2].Key, '\\') != NULL) {
1039                 IReply("NO Invalid character in folder name");
1040                 IMAPM_syslog(LOG_ERR, "invalid character in folder name");
1041                 return;
1042         }
1043
1044         ret = imap_roomname(roomname, sizeof roomname, Params[2].Key);
1045         if (ret < 0) {
1046                 IReply("NO Invalid mailbox name or location");
1047                 IMAPM_syslog(LOG_ERR, "invalid mailbox name or location");
1048                 return;
1049         }
1050         floornum = (ret & 0x00ff);      /* lower 8 bits = floor number */
1051         flags = (ret & 0xff00); /* upper 8 bits = flags        */
1052
1053         if (flags & IR_MAILBOX) {
1054                 if (strncasecmp(Params[2].Key, "INBOX/", 6)) {
1055                         IReply("NO Personal folders must be created under INBOX");
1056                         IMAPM_syslog(LOG_ERR, "not subordinate to inbox");
1057                         return;
1058                 }
1059         }
1060
1061         if (flags & IR_MAILBOX) {
1062                 newroomtype = 4;                /* private mailbox */
1063                 newroomview = VIEW_MAILBOX;
1064         } else {
1065                 newroomtype = 0;                /* public folder */
1066                 newroomview = VIEW_BBS;
1067         }
1068
1069         IMAP_syslog(LOG_INFO, "Create new room <%s> on floor <%d> with type <%d>",
1070                     roomname, floornum, newroomtype);
1071
1072         ret = CtdlCreateRoom(roomname, newroomtype, "", floornum, 1, 0, newroomview);
1073         if (ret == 0) {
1074                 /*** DO NOT CHANGE THIS ERROR MESSAGE IN ANY WAY!  BYNARI CONNECTOR DEPENDS ON IT! ***/
1075                 IReply("NO Mailbox already exists, or create failed");
1076         } else {
1077                 IReply("OK CREATE completed");
1078                 /* post a message in Aide> describing the new room */
1079                 notification_message = malloc(1024);
1080                 snprintf(notification_message, 1024,
1081                         "A new room called \"%s\" has been created by %s%s%s%s\n",
1082                         roomname,
1083                         CC->user.fullname,
1084                         ((ret & QR_MAILBOX) ? " [personal]" : ""),
1085                         ((ret & QR_PRIVATE) ? " [private]" : ""),
1086                         ((ret & QR_GUESSNAME) ? " [hidden]" : "")
1087                 );
1088                 CtdlAideMessage(notification_message, "Room Creation Message");
1089                 free(notification_message);
1090         }
1091         IMAPM_syslog(LOG_DEBUG, "imap_create() completed");
1092 }
1093
1094
1095 /*
1096  * Locate a room by its IMAP folder name, and check access to it.
1097  * If zapped_ok is nonzero, we can also look for the room in the zapped list.
1098  */
1099 int imap_grabroom(char *returned_roomname, const char *foldername, int zapped_ok)
1100 {
1101         int ret;
1102         char augmented_roomname[ROOMNAMELEN];
1103         char roomname[ROOMNAMELEN];
1104         int c;
1105         struct ctdlroom QRscratch;
1106         int ra;
1107         int ok = 0;
1108
1109         ret = imap_roomname(roomname, sizeof roomname, foldername);
1110         if (ret < 0) {
1111                 return (1);
1112         }
1113
1114         /* First try a regular match */
1115         c = CtdlGetRoom(&QRscratch, roomname);
1116
1117         /* Then try a mailbox name match */
1118         if (c != 0) {
1119                 CtdlMailboxName(augmented_roomname, sizeof augmented_roomname,
1120                             &CC->user, roomname);
1121                 c = CtdlGetRoom(&QRscratch, augmented_roomname);
1122                 if (c == 0)
1123                         safestrncpy(roomname, augmented_roomname, sizeof(roomname));
1124         }
1125
1126         /* If the room exists, check security/access */
1127         if (c == 0) {
1128                 /* See if there is an existing user/room relationship */
1129                 CtdlRoomAccess(&QRscratch, &CC->user, &ra, NULL);
1130
1131                 /* normal clients have to pass through security */
1132                 if (ra & UA_KNOWN) {
1133                         ok = 1;
1134                 }
1135                 if ((zapped_ok) && (ra & UA_ZAPPED)) {
1136                         ok = 1;
1137                 }
1138         }
1139
1140         /* Fail here if no such room */
1141         if (!ok) {
1142                 strcpy(returned_roomname, "");
1143                 return (2);
1144         } else {
1145                 safestrncpy(returned_roomname, QRscratch.QRname, ROOMNAMELEN);
1146                 return (0);
1147         }
1148 }
1149
1150
1151 /*
1152  * Implements the STATUS command (sort of)
1153  *
1154  */
1155 void imap_status(int num_parms, ConstStr *Params)
1156 {
1157         int ret;
1158         char roomname[ROOMNAMELEN];
1159         char imaproomname[SIZ];
1160         char savedroom[ROOMNAMELEN];
1161         int msgs, new;
1162
1163         ret = imap_grabroom(roomname, Params[2].Key, 1);
1164         if (ret != 0) {
1165                 IReply("NO Invalid mailbox name or location, or access denied");
1166                 return;
1167         }
1168
1169         /*
1170          * CtdlUserGoto() formally takes us to the desired room, happily returning
1171          * the number of messages and number of new messages.  (If another
1172          * folder is selected, save its name so we can return there!!!!!)
1173          */
1174         if (IMAP->selected) {
1175                 strcpy(savedroom, CC->room.QRname);
1176         }
1177         CtdlUserGoto(roomname, 0, 0, &msgs, &new);
1178
1179         /*
1180          * Tell the client what it wants to know.  In fact, tell it *more* than
1181          * it wants to know.  We happily IGnore the supplied status data item
1182          * names and simply spew all possible data items.  It's far easier to
1183          * code and probably saves us some processing time too.
1184          */
1185         imap_mailboxname(imaproomname, sizeof imaproomname, &CC->room);
1186         IAPuts("* STATUS ");
1187                plain_imap_strout(imaproomname);
1188         IAPrintf(" (MESSAGES %d ", msgs);
1189         IAPrintf("RECENT %d ", new);    /* Initially, new==recent */
1190         IAPrintf("UIDNEXT %ld ", CitControl.MMhighest + 1);
1191         IAPrintf("UNSEEN %d)\r\n", new);
1192
1193         /*
1194          * If another folder is selected, go back to that room so we can resume
1195          * our happy day without violent explosions.
1196          */
1197         if (IMAP->selected) {
1198                 CtdlUserGoto(savedroom, 0, 0, &msgs, &new);
1199         }
1200
1201         /*
1202          * Oooh, look, we're done!
1203          */
1204         IReply("OK STATUS completed");
1205 }
1206
1207
1208 /*
1209  * Implements the SUBSCRIBE command
1210  *
1211  */
1212 void imap_subscribe(int num_parms, ConstStr *Params)
1213 {
1214         int ret;
1215         char roomname[ROOMNAMELEN];
1216         char savedroom[ROOMNAMELEN];
1217         int msgs, new;
1218
1219         ret = imap_grabroom(roomname, Params[2].Key, 1);
1220         if (ret != 0) {
1221                 IReplyPrintf(
1222                         "NO Error %d: invalid mailbox name or location, or access denied",
1223                         ret
1224                 );
1225                 return;
1226         }
1227
1228         /*
1229          * CtdlUserGoto() formally takes us to the desired room, which has the side
1230          * effect of marking the room as not-zapped ... exactly the effect
1231          * we're looking for.
1232          */
1233         if (IMAP->selected) {
1234                 strcpy(savedroom, CC->room.QRname);
1235         }
1236         CtdlUserGoto(roomname, 0, 0, &msgs, &new);
1237
1238         /*
1239          * If another folder is selected, go back to that room so we can resume
1240          * our happy day without violent explosions.
1241          */
1242         if (IMAP->selected) {
1243                 CtdlUserGoto(savedroom, 0, 0, &msgs, &new);
1244         }
1245
1246         IReply("OK SUBSCRIBE completed");
1247 }
1248
1249
1250 /*
1251  * Implements the UNSUBSCRIBE command
1252  *
1253  */
1254 void imap_unsubscribe(int num_parms, ConstStr *Params)
1255 {
1256         int ret;
1257         char roomname[ROOMNAMELEN];
1258         char savedroom[ROOMNAMELEN];
1259         int msgs, new;
1260
1261         ret = imap_grabroom(roomname, Params[2].Key, 1);
1262         if (ret != 0) {
1263                 IReply("NO Invalid mailbox name or location, or access denied");
1264                 return;
1265         }
1266
1267         /*
1268          * CtdlUserGoto() formally takes us to the desired room.
1269          */
1270         if (IMAP->selected) {
1271                 strcpy(savedroom, CC->room.QRname);
1272         }
1273         CtdlUserGoto(roomname, 0, 0, &msgs, &new);
1274
1275         /*
1276          * Now make the API call to zap the room
1277          */
1278         if (CtdlForgetThisRoom() == 0) {
1279                 IReply("OK UNSUBSCRIBE completed");
1280         } else {
1281                 IReply("NO You may not unsubscribe from this folder.");
1282         }
1283
1284         /*
1285          * If another folder is selected, go back to that room so we can resume
1286          * our happy day without violent explosions.
1287          */
1288         if (IMAP->selected) {
1289                 CtdlUserGoto(savedroom, 0, 0, &msgs, &new);
1290         }
1291 }
1292
1293
1294 /*
1295  * Implements the DELETE command
1296  *
1297  */
1298 void imap_delete(int num_parms, ConstStr *Params)
1299 {
1300         int ret;
1301         char roomname[ROOMNAMELEN];
1302         char savedroom[ROOMNAMELEN];
1303         int msgs, new;
1304
1305         ret = imap_grabroom(roomname, Params[2].Key, 1);
1306         if (ret != 0) {
1307                 IReply("NO Invalid mailbox name, or access denied");
1308                 return;
1309         }
1310
1311         /*
1312          * CtdlUserGoto() formally takes us to the desired room, happily returning
1313          * the number of messages and number of new messages.  (If another
1314          * folder is selected, save its name so we can return there!!!!!)
1315          */
1316         if (IMAP->selected) {
1317                 strcpy(savedroom, CC->room.QRname);
1318         }
1319         CtdlUserGoto(roomname, 0, 0, &msgs, &new);
1320
1321         /*
1322          * Now delete the room.
1323          */
1324         if (CtdlDoIHavePermissionToDeleteThisRoom(&CC->room)) {
1325                 CtdlScheduleRoomForDeletion(&CC->room);
1326                 IReply("OK DELETE completed");
1327         } else {
1328                 IReply("NO Can't delete this folder.");
1329         }
1330
1331         /*
1332          * If another folder is selected, go back to that room so we can resume
1333          * our happy day without violent explosions.
1334          */
1335         if (IMAP->selected) {
1336                 CtdlUserGoto(savedroom, 0, 0, &msgs, &new);
1337         }
1338 }
1339
1340
1341 /*
1342  * Back end function for imap_rename()
1343  */
1344 void imap_rename_backend(struct ctdlroom *qrbuf, void *data)
1345 {
1346         char foldername[SIZ];
1347         char newfoldername[SIZ];
1348         char newroomname[ROOMNAMELEN];
1349         int newfloor = 0;
1350         struct irl *irlp = NULL;        /* scratch pointer */
1351         irlparms *myirlparms;
1352
1353         myirlparms = (irlparms *) data;
1354         imap_mailboxname(foldername, sizeof foldername, qrbuf);
1355
1356         /* Rename subfolders */
1357         if ((!strncasecmp(foldername, myirlparms->oldname,
1358                           myirlparms->oldnamelen)
1359             && (foldername[myirlparms->oldnamelen] == '/'))) {
1360
1361                 sprintf(newfoldername, "%s/%s",
1362                         myirlparms->newname,
1363                         &foldername[myirlparms->oldnamelen + 1]
1364                     );
1365
1366                 newfloor = imap_roomname(newroomname,
1367                                          sizeof newroomname,
1368                                          newfoldername) & 0xFF;
1369
1370                 irlp = (struct irl *) malloc(sizeof(struct irl));
1371                 strcpy(irlp->irl_newroom, newroomname);
1372                 strcpy(irlp->irl_oldroom, qrbuf->QRname);
1373                 irlp->irl_newfloor = newfloor;
1374                 irlp->next = *(myirlparms->irl);
1375                 *(myirlparms->irl) = irlp;
1376         }
1377 }
1378
1379
1380 /*
1381  * Implements the RENAME command
1382  *
1383  */
1384 void imap_rename(int num_parms, ConstStr *Params)
1385 {
1386         char old_room[ROOMNAMELEN];
1387         char new_room[ROOMNAMELEN];
1388         int newr;
1389         int new_floor;
1390         int r;
1391         struct irl *irl = NULL; /* the list */
1392         struct irl *irlp = NULL;        /* scratch pointer */
1393         irlparms irlparms;
1394         char aidemsg[1024];
1395
1396         if (strchr(Params[3].Key, '\\') != NULL) {
1397                 IReply("NO Invalid character in folder name");
1398                 return;
1399         }
1400
1401         imap_roomname(old_room, sizeof old_room, Params[2].Key);
1402         newr = imap_roomname(new_room, sizeof new_room, Params[3].Key);
1403         new_floor = (newr & 0xFF);
1404
1405         r = CtdlRenameRoom(old_room, new_room, new_floor);
1406
1407         if (r == crr_room_not_found) {
1408                 IReply("NO Could not locate this folder");
1409                 return;
1410         }
1411         if (r == crr_already_exists) {
1412                 IReplyPrintf("NO '%s' already exists.");
1413                 return;
1414         }
1415         if (r == crr_noneditable) {
1416                 IReply("NO This folder is not editable.");
1417                 return;
1418         }
1419         if (r == crr_invalid_floor) {
1420                 IReply("NO Folder root does not exist.");
1421                 return;
1422         }
1423         if (r == crr_access_denied) {
1424                 IReply("NO You do not have permission to edit this folder.");
1425                 return;
1426         }
1427         if (r != crr_ok) {
1428                 IReplyPrintf("NO Rename failed - undefined error %d", r);
1429                 return;
1430         }
1431
1432         /* If this is the INBOX, then RFC2060 says we have to just move the
1433          * contents.  In a Citadel environment it's easier to rename the room
1434          * (already did that) and create a new inbox.
1435          */
1436         if (!strcasecmp(Params[2].Key, "INBOX")) {
1437                 CtdlCreateRoom(MAILROOM, 4, "", 0, 1, 0, VIEW_MAILBOX);
1438         }
1439
1440         /* Otherwise, do the subfolders.  Build a list of rooms to rename... */
1441         else {
1442                 irlparms.oldname = Params[2].Key;
1443                 irlparms.oldnamelen = Params[2].len;
1444                 irlparms.newname = Params[3].Key;
1445                 irlparms.newnamelen = Params[3].len;
1446                 irlparms.irl = &irl;
1447                 CtdlForEachRoom(imap_rename_backend, (void *) &irlparms);
1448
1449                 /* ... and now rename them. */
1450                 while (irl != NULL) {
1451                         r = CtdlRenameRoom(irl->irl_oldroom,
1452                                            irl->irl_newroom,
1453                                            irl->irl_newfloor);
1454                         if (r != crr_ok) {
1455                                 struct CitContext *CCC = CC;
1456                                 /* FIXME handle error returns better */
1457                                 IMAP_syslog(LOG_ERR, "CtdlRenameRoom() error %d", r);
1458                         }
1459                         irlp = irl;
1460                         irl = irl->next;
1461                         free(irlp);
1462                 }
1463         }
1464
1465         snprintf(aidemsg, sizeof aidemsg, "IMAP folder \"%s\" renamed to \"%s\" by %s\n",
1466                 Params[2].Key,
1467                 Params[3].Key,
1468                 CC->curr_user
1469         );
1470         CtdlAideMessage(aidemsg, "IMAP folder rename");
1471
1472         IReply("OK RENAME completed");
1473 }
1474
1475
1476 /*
1477  * Main command loop for IMAP sessions.
1478  */
1479 void imap_command_loop(void)
1480 {
1481         struct CitContext *CCC = CC;
1482         struct timeval tv1, tv2;
1483         suseconds_t total_time = 0;
1484         citimap *Imap;
1485         const char *pchs, *pche;
1486         const imap_handler_hook *h;
1487
1488         gettimeofday(&tv1, NULL);
1489         CCC->lastcmd = time(NULL);
1490         Imap = CCCIMAP;
1491
1492         flush_output();
1493         if (Imap->Cmd.CmdBuf == NULL)
1494                 Imap->Cmd.CmdBuf = NewStrBufPlain(NULL, SIZ);
1495         else
1496                 FlushStrBuf(Imap->Cmd.CmdBuf);
1497
1498         if (CtdlClientGetLine(Imap->Cmd.CmdBuf) < 1) {
1499                 IMAPM_syslog(LOG_ERR, "client disconnected: ending session.");
1500                 CC->kill_me = KILLME_CLIENT_DISCONNECTED;
1501                 return;
1502         }
1503
1504         if (Imap->authstate == imap_as_expecting_password) {
1505                 IMAPM_syslog(LOG_INFO, "<password>");
1506         }
1507         else if (Imap->authstate == imap_as_expecting_plainauth) {
1508                 IMAPM_syslog(LOG_INFO, "<plain_auth>");
1509         }
1510         else if ((Imap->authstate == imap_as_expecting_multilineusername) ||
1511                  cbmstrcasestr(ChrPtr(Imap->Cmd.CmdBuf), " LOGIN ")) {
1512                 IMAPM_syslog(LOG_INFO, "LOGIN...");
1513         }
1514         else {
1515                 IMAP_syslog(LOG_DEBUG, "%s", ChrPtr(Imap->Cmd.CmdBuf));
1516         }
1517
1518         pchs = ChrPtr(Imap->Cmd.CmdBuf);
1519         pche = pchs + StrLength(Imap->Cmd.CmdBuf);
1520
1521         while ((pche > pchs) &&
1522                ((*pche == '\n') ||
1523                 (*pche == '\r')))
1524         {
1525                 pche --;
1526                 StrBufCutRight(Imap->Cmd.CmdBuf, 1);
1527         }
1528         StrBufTrim(Imap->Cmd.CmdBuf);
1529
1530         /* If we're in the middle of a multi-line command, handle that */
1531         switch (Imap->authstate){
1532         case imap_as_expecting_username:
1533                 imap_auth_login_user(imap_as_expecting_username);
1534                 IUnbuffer();
1535                 return;
1536         case imap_as_expecting_multilineusername:
1537                 imap_auth_login_user(imap_as_expecting_multilineusername);
1538                 IUnbuffer();
1539                 return;
1540         case imap_as_expecting_plainauth:
1541                 imap_auth_plain();
1542                 IUnbuffer();
1543                 return;
1544         case imap_as_expecting_password:
1545                 imap_auth_login_pass(imap_as_expecting_password);
1546                 IUnbuffer();
1547                 return;
1548         case imap_as_expecting_multilinepassword:
1549                 imap_auth_login_pass(imap_as_expecting_multilinepassword);
1550                 IUnbuffer();
1551                 return;
1552         default:
1553                 break;
1554         }
1555
1556         /* Ok, at this point we're in normal command mode.
1557          * If the command just submitted does not contain a literal, we
1558          * might think about delivering some untagged stuff...
1559          */
1560
1561         /* Grab the tag, command, and parameters. */
1562         imap_parameterize(&Imap->Cmd);
1563 #if 0
1564 /* debug output the parsed vector */
1565         {
1566                 int i;
1567                 IMAP_syslog(LOG_DEBUG, "----- %ld params", Imap->Cmd.num_parms);
1568
1569         for (i=0; i < Imap->Cmd.num_parms; i++) {
1570                 if (Imap->Cmd.Params[i].len != strlen(Imap->Cmd.Params[i].Key))
1571                         IMAP_syslog(LOG_DEBUG, "*********** %ld != %ld : %s",
1572                                     Imap->Cmd.Params[i].len,
1573                                     strlen(Imap->Cmd.Params[i].Key),
1574                                       Imap->Cmd.Params[i].Key);
1575                 else
1576                         IMAP_syslog(LOG_DEBUG, "%ld : %s",
1577                                     Imap->Cmd.Params[i].len,
1578                                     Imap->Cmd.Params[i].Key);
1579         }}
1580 #endif
1581
1582         /* Now for the command set. */
1583         h = imap_lookup(Imap->Cmd.num_parms, Imap->Cmd.Params);
1584
1585         if (h == NULL)
1586         {
1587                 IReply("BAD command unrecognized");
1588                 goto BAIL;
1589         }
1590
1591         /* RFC3501 says that we cannot output untagged data during these commands */
1592         if ((h->Flags & I_FLAG_UNTAGGED) == 0) {
1593
1594                 /* we can put any additional untagged stuff right here in the future */
1595
1596                 /*
1597                  * Before processing the command that was just entered... if we happen
1598                  * to have a folder selected, we'd like to rescan that folder for new
1599                  * messages, and for deletions/changes of existing messages.  This
1600                  * could probably be optimized better with some deep thought...
1601                  */
1602                 if (Imap->selected) {
1603                         imap_rescan_msgids();
1604                 }
1605         }
1606
1607         /* does our command require a logged-in state */
1608         if ((!CC->logged_in) && ((h->Flags & I_FLAG_LOGGED_IN) != 0)) {
1609                 IReply("BAD Not logged in.");
1610                 goto BAIL;
1611         }
1612
1613         /* does our command require the SELECT state on a mailbox */
1614         if ((Imap->selected == 0) && ((h->Flags & I_FLAG_SELECT) != 0)){
1615                 IReply("BAD no folder selected");
1616                 goto BAIL;
1617         }
1618         h->h(Imap->Cmd.num_parms, Imap->Cmd.Params);
1619
1620         /* If the client transmitted a message we can free it now */
1621
1622 BAIL:
1623         IUnbuffer();
1624
1625         imap_free_transmitted_message();
1626
1627         gettimeofday(&tv2, NULL);
1628         total_time = (tv2.tv_usec + (tv2.tv_sec * 1000000)) - (tv1.tv_usec + (tv1.tv_sec * 1000000));
1629         IMAP_syslog(LOG_DEBUG, "IMAP command completed in %ld.%ld seconds",
1630                     (total_time / 1000000),
1631                     (total_time % 1000000)
1632                 );
1633 }
1634
1635 void imap_noop (int num_parms, ConstStr *Params)
1636 {
1637         IReply("OK No operation");
1638 }
1639
1640 void imap_logout(int num_parms, ConstStr *Params)
1641 {
1642         if (IMAP->selected) {
1643                 imap_do_expunge();      /* yes, we auto-expunge at logout */
1644         }
1645         IAPrintf("* BYE %s logging out\r\n", config.c_fqdn);
1646         IReply("OK Citadel IMAP session ended.");
1647         CC->kill_me = KILLME_CLIENT_LOGGED_OUT;
1648         return;
1649 }
1650
1651 const char *CitadelServiceIMAP="IMAP";
1652 const char *CitadelServiceIMAPS="IMAPS";
1653
1654 void SetIMAPDebugEnabled(const int n)
1655 {
1656         IMAPDebugEnabled = n;
1657 }
1658 /*
1659  * This function is called to register the IMAP extension with Citadel.
1660  */
1661 CTDL_MODULE_INIT(imap)
1662 {
1663         if (ImapCmds == NULL)
1664                 ImapCmds = NewHash(1, NULL);
1665
1666         RegisterImapCMD("NOOP", "", imap_noop, I_FLAG_NONE);
1667         RegisterImapCMD("CHECK", "", imap_noop, I_FLAG_NONE);
1668         RegisterImapCMD("ID", "", imap_id, I_FLAG_NONE);
1669         RegisterImapCMD("LOGOUT", "", imap_logout, I_FLAG_NONE);
1670         RegisterImapCMD("LOGIN", "", imap_login, I_FLAG_NONE);
1671         RegisterImapCMD("AUTHENTICATE", "", imap_authenticate, I_FLAG_NONE);
1672         RegisterImapCMD("CAPABILITY", "", imap_capability, I_FLAG_NONE);
1673 #ifdef HAVE_OPENSSL
1674         RegisterImapCMD("STARTTLS", "", imap_starttls, I_FLAG_NONE);
1675 #endif
1676
1677         /* The commans below require a logged-in state */
1678         RegisterImapCMD("SELECT", "", imap_select, I_FLAG_LOGGED_IN);
1679         RegisterImapCMD("EXAMINE", "", imap_select, I_FLAG_LOGGED_IN);
1680         RegisterImapCMD("LSUB", "", imap_list, I_FLAG_LOGGED_IN);
1681         RegisterImapCMD("LIST", "", imap_list, I_FLAG_LOGGED_IN);
1682         RegisterImapCMD("CREATE", "", imap_create, I_FLAG_LOGGED_IN);
1683         RegisterImapCMD("DELETE", "", imap_delete, I_FLAG_LOGGED_IN);
1684         RegisterImapCMD("RENAME", "", imap_rename, I_FLAG_LOGGED_IN);
1685         RegisterImapCMD("STATUS", "", imap_status, I_FLAG_LOGGED_IN);
1686         RegisterImapCMD("SUBSCRIBE", "", imap_subscribe, I_FLAG_LOGGED_IN);
1687         RegisterImapCMD("UNSUBSCRIBE", "", imap_unsubscribe, I_FLAG_LOGGED_IN);
1688         RegisterImapCMD("APPEND", "", imap_append, I_FLAG_LOGGED_IN);
1689         RegisterImapCMD("NAMESPACE", "", imap_namespace, I_FLAG_LOGGED_IN);
1690         RegisterImapCMD("SETACL", "", imap_setacl, I_FLAG_LOGGED_IN);
1691         RegisterImapCMD("DELETEACL", "", imap_deleteacl, I_FLAG_LOGGED_IN);
1692         RegisterImapCMD("GETACL", "", imap_getacl, I_FLAG_LOGGED_IN);
1693         RegisterImapCMD("LISTRIGHTS", "", imap_listrights, I_FLAG_LOGGED_IN);
1694         RegisterImapCMD("MYRIGHTS", "", imap_myrights, I_FLAG_LOGGED_IN);
1695         RegisterImapCMD("GETMETADATA", "", imap_getmetadata, I_FLAG_LOGGED_IN);
1696         RegisterImapCMD("SETMETADATA", "", imap_setmetadata, I_FLAG_LOGGED_IN);
1697
1698         /* The commands below require the SELECT state on a mailbox */
1699         RegisterImapCMD("FETCH", "", imap_fetch, I_FLAG_LOGGED_IN | I_FLAG_SELECT | I_FLAG_UNTAGGED);
1700         RegisterImapCMD("UID", "FETCH", imap_uidfetch, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1701         RegisterImapCMD("SEARCH", "", imap_search, I_FLAG_LOGGED_IN | I_FLAG_SELECT | I_FLAG_UNTAGGED);
1702         RegisterImapCMD("UID", "SEARCH", imap_uidsearch, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1703         RegisterImapCMD("STORE", "", imap_store, I_FLAG_LOGGED_IN | I_FLAG_SELECT | I_FLAG_UNTAGGED);
1704         RegisterImapCMD("UID", "STORE", imap_uidstore, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1705         RegisterImapCMD("COPY", "", imap_copy, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1706         RegisterImapCMD("UID", "COPY", imap_uidcopy, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1707         RegisterImapCMD("EXPUNGE", "", imap_expunge, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1708         RegisterImapCMD("UID", "EXPUNGE", imap_expunge, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1709         RegisterImapCMD("CLOSE", "", imap_close, I_FLAG_LOGGED_IN | I_FLAG_SELECT);
1710
1711         if (!threading)
1712         {
1713                 CtdlRegisterDebugFlagHook(HKEY("imapsrv"), SetIMAPDebugEnabled, &IMAPDebugEnabled);
1714                 CtdlRegisterServiceHook(config.c_imap_port,
1715                                         NULL, imap_greeting, imap_command_loop, NULL, CitadelServiceIMAP);
1716 #ifdef HAVE_OPENSSL
1717                 CtdlRegisterServiceHook(config.c_imaps_port,
1718                                         NULL, imaps_greeting, imap_command_loop, NULL, CitadelServiceIMAPS);
1719 #endif
1720                 CtdlRegisterSessionHook(imap_cleanup_function, EVT_STOP, PRIO_STOP + 30);
1721                 CtdlRegisterCleanupHook(imap_cleanup);
1722         }
1723
1724         /* return our module name for the log */
1725         return "imap";
1726 }