citadel/citserver.c

   1 /*
   2  * $Id$
   3  *
   4  * Main source module for the Citadel server
   5  *
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include <ctype.h>
  30 #include <string.h>
  31 #include <dirent.h>
  32 #include <errno.h>
  33 #include <limits.h>
  34 #include <netdb.h>
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37 #include <netinet/in.h>
  38 #include <arpa/inet.h>
  39 #include "citadel.h"
  40 #include "server.h"
  41 #include "serv_extensions.h"
  42 #include "sysdep_decls.h"
  43 #include "citserver.h"
  44 #include "config.h"
  45 #include "database.h"
  46 #include "housekeeping.h"
  47 #include "user_ops.h"
  48 #include "msgbase.h"
  49 #include "support.h"
  50 #include "locate_host.h"
  51 #include "room_ops.h"
  52 #include "file_ops.h"
  53 #include "policy.h"
  54 #include "control.h"
  55 #include "tools.h"
  56 #include "euidindex.h"
  57 #include "serv_network.h"
  58
  59 #ifndef HAVE_SNPRINTF
  60 #include "snprintf.h"
  61 #endif
  62
  63 struct CitContext *ContextList = NULL;
  64 struct CitContext* next_session = NULL;
  65 char *unique_session_numbers;
  66 int ScheduledShutdown = 0;
  67 int do_defrag = 0;
  68 time_t server_startup_time;
  69
  70 /*
  71  * Various things that need to be initialized at startup
  72  */
  73 void master_startup(void) {
  74         struct timeval tv;
  75         unsigned int seed;
  76         FILE *urandom;
  77         struct ctdlroom qrbuf;
  78
  79         lprintf(CTDL_DEBUG, "master_startup() started\n");
  80         time(&server_startup_time);
  81
  82         lprintf(CTDL_INFO, "Opening databases\n");
  83         open_databases();
  84
  85         if (do_defrag) {
  86                 defrag_databases();
  87         }
  88
  89         check_ref_counts();
  90
  91         lprintf(CTDL_INFO, "Creating base rooms (if necessary)\n");
  92         create_room(config.c_baseroom,  0, "", 0, 1, 0, VIEW_BBS);
  93         create_room(AIDEROOM,           3, "", 0, 1, 0, VIEW_BBS);
  94         create_room(SYSCONFIGROOM,      3, "", 0, 1, 0, VIEW_BBS);
  95         create_room(config.c_twitroom,  0, "", 0, 1, 0, VIEW_BBS);
  96
  97         /* The "Local System Configuration" room doesn't need to be visible */
  98         if (lgetroom(&qrbuf, SYSCONFIGROOM) == 0) {
  99                 qrbuf.QRflags2 |= QR2_SYSTEM;
 100                 lputroom(&qrbuf);
 101         }
 102
 103         lprintf(CTDL_INFO, "Seeding the pseudo-random number generator...\n");
 104         urandom = fopen("/dev/urandom", "r");
 105         if (urandom != NULL) {
 106                 fread(&seed, sizeof seed, 1, urandom);
 107                 fclose(urandom);
 108         }
 109         else {
 110                 gettimeofday(&tv, NULL);
 111                 seed = tv.tv_usec;
 112         }
 113         srandom(seed);
 114
 115         lprintf(CTDL_INFO, "Initializing ipgm secret\n");
 116         get_config();
 117         config.c_ipgm_secret = rand();
 118         put_config();
 119
 120         lprintf(CTDL_DEBUG, "master_startup() finished\n");
 121 }
 122
 123
 124 /*
 125  * Cleanup routine to be called when the server is shutting down.
 126  */
 127 void master_cleanup(int exitcode) {
 128         struct CleanupFunctionHook *fcn;
 129         static int already_cleaning_up = 0;
 130
 131         if (already_cleaning_up) while(1) sleep(1);
 132         already_cleaning_up = 1;
 133
 134         /* Run any cleanup routines registered by loadable modules */
 135         for (fcn = CleanupHookTable; fcn != NULL; fcn = fcn->next) {
 136                 (*fcn->h_function_pointer)();
 137         }
 138
 139         /* Close the AdjRefCount queue file */
 140         AdjRefCount(-1, 0);
 141
 142         /* Shut down the indexer thread */
 143         lprintf(CTDL_INFO, "Waiting for the indexer thread to shut down\n");
 144         pthread_join(indexer_thread_tid, NULL);
 145
 146         /* Shut down the checkpoint thread */
 147         lprintf(CTDL_INFO, "Waiting for the checkpoint thread to shut down\n");
 148         pthread_join(checkpoint_thread_tid, NULL);
 149
 150         /* Close databases */
 151         lprintf(CTDL_INFO, "Closing databases\n");
 152         close_databases();
 153
 154         /* flush the networker stuff */
 155         destroy_network_queue_room();
 156
 157         /* Do system-dependent stuff */
 158         sysdep_master_cleanup();
 159
 160 #ifdef DEBUG_MEMORY_LEAKS
 161         dump_heap();
 162 #endif
 163
 164         /* If the operator requested a halt but not an exit, halt here. */
 165         if (shutdown_and_halt) {
 166                 lprintf(CTDL_NOTICE, "citserver: Halting server without exiting.\n");
 167                 fflush(stdout); fflush(stderr);
 168                 while(1) {
 169                         sleep(32767);
 170                 }
 171         }
 172
 173         release_control();
 174
 175         /* Now go away. */
 176         lprintf(CTDL_NOTICE, "citserver: Exiting with status %d\n", exitcode);
 177         fflush(stdout); fflush(stderr);
 178
 179         exit(exitcode);
 180 }
 181
 182
 183
 184 /*
 185  * Terminate a session.
 186  */
 187 void RemoveContext (struct CitContext *con)
 188 {
 189         if (con==NULL) {
 190                 lprintf(CTDL_ERR,
 191                         "WARNING: RemoveContext() called with NULL!\n");
 192                 return;
 193         }
 194         lprintf(CTDL_DEBUG, "RemoveContext() session %d\n", con->cs_pid);
 195
 196         /* Run any cleanup routines registered by loadable modules.
 197          * Note: We have to "become_session()" because the cleanup functions
 198          *       might make references to "CC" assuming it's the right one.
 199          */
 200         become_session(con);
 201         PerformSessionHooks(EVT_STOP);
 202         become_session(NULL);
 203
 204         /* Now handle all of the administrivia. */
 205         lprintf(CTDL_DEBUG, "Calling logout(%d)\n", con->cs_pid);
 206         logout(con);
 207
 208         lprintf(CTDL_NOTICE, "[%3d] Session ended.\n", con->cs_pid);
 209
 210         /* If the client is still connected, blow 'em away. */
 211         lprintf(CTDL_DEBUG, "Closing socket %d\n", con->client_socket);
 212         close(con->client_socket);
 213
 214         lprintf(CTDL_DEBUG, "Done with RemoveContext()\n");
 215 }
 216
 217
 218
 219
 220
 221 /*
 222  * cmd_info()  -  tell the client about this server
 223  */
 224 void cmd_info(void) {
 225         cprintf("%d Server info:\n", LISTING_FOLLOWS);
 226         cprintf("%d\n", CC->cs_pid);
 227         cprintf("%s\n", config.c_nodename);
 228         cprintf("%s\n", config.c_humannode);
 229         cprintf("%s\n", config.c_fqdn);
 230         cprintf("%s\n", CITADEL);
 231         cprintf("%d\n", REV_LEVEL);
 232         cprintf("%s\n", config.c_site_location);
 233         cprintf("%s\n", config.c_sysadm);
 234         cprintf("%d\n", SERVER_TYPE);
 235         cprintf("%s\n", config.c_moreprompt);
 236         cprintf("1\n"); /* 1 = yes, this system supports floors */
 237         cprintf("1\n"); /* 1 = we support the extended paging options */
 238         cprintf("%s\n", CC->cs_nonce);
 239         cprintf("1\n"); /* 1 = yes, this system supports the QNOP command */
 240
 241 #ifdef HAVE_LDAP
 242         cprintf("1\n"); /* 1 = yes, this server is LDAP-enabled */
 243 #else
 244         cprintf("0\n"); /* 1 = no, this server is not LDAP-enabled */
 245 #endif
 246
 247         if (config.c_auth_mode == 1) {
 248                 cprintf("1\n"); /* "create new user" never works with host auth */
 249         }
 250         else {
 251                 cprintf("%d\n", config.c_disable_newu); /* otherwise, site defined */
 252         }
 253
 254         cprintf("%s\n", config.c_default_cal_zone);
 255
 256         cprintf("000\n");
 257 }
 258
 259
 260 /*
 261  * returns an asterisk if there are any instant messages waiting,
 262  * space otherwise.
 263  */
 264 char CtdlCheckExpress(void) {
 265         if (CC->FirstExpressMessage == NULL) {
 266                 return(' ');
 267         }
 268         else {
 269                 return('*');
 270         }
 271 }
 272
 273 void cmd_time(void)
 274 {
 275    time_t tv;
 276    struct tm tmp;
 277
 278    tv = time(NULL);
 279    localtime_r(&tv, &tmp);
 280
 281    /* timezone and daylight global variables are not portable. */
 282 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 283    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, tmp.tm_gmtoff, tmp.tm_isdst);
 284 #else
 285    cprintf("%d %ld|%ld|%d\n", CIT_OK, (long)tv, timezone, tmp.tm_isdst);
 286 #endif
 287 }
 288
 289
 290 /*
 291  * Check originating host against the public_clients file.  This determines
 292  * whether the client is allowed to change the hostname for this session
 293  * (for example, to show the location of the user rather than the location
 294  * of the client).
 295  */
 296 int is_public_client(void)
 297 {
 298         char buf[1024];
 299         char addrbuf[1024];
 300         FILE *fp;
 301         int i;
 302         struct stat statbuf;
 303         static time_t pc_timestamp = 0;
 304         static char public_clients[SIZ];
 305         static char public_clients_file[SIZ];
 306
 307         snprintf(public_clients_file,
 308                          sizeof public_clients_file,
 309                          "%s/public_clients",
 310                          ctdl_etc_dir);
 311
 312         /*
 313          * Check the time stamp on the public_clients file.  If it's been
 314          * updated since the last time we were here (or if this is the first
 315          * time we've been through the loop), read its contents and learn
 316          * the IP addresses of the listed hosts.
 317          */
 318         if (stat(public_clients_file, &statbuf) != 0) {
 319                 /* No public_clients file exists, so bail out */
 320                 lprintf(CTDL_WARNING, "Warning: '%s' does not exist\n",
 321                                 public_clients_file);
 322                 return(0);
 323         }
 324
 325         if (statbuf.st_mtime > pc_timestamp) {
 326                 begin_critical_section(S_PUBLIC_CLIENTS);
 327                 lprintf(CTDL_INFO, "Loading %s\n", public_clients_file);
 328
 329                 safestrncpy(public_clients, "127.0.0.1", sizeof public_clients);
 330                 if (hostname_to_dotted_quad(addrbuf, config.c_fqdn) == 0) {
 331                         strcat(public_clients, "|");
 332                         strcat(public_clients, addrbuf);
 333                 }
 334
 335                 fp = fopen(public_clients_file, "r");
 336                 if (fp != NULL) while (fgets(buf, sizeof buf, fp)!=NULL) {
 337                         for (i=0; i<strlen(buf); ++i) {
 338                                 if (buf[i] == '#') buf[i] = 0;
 339                         }
 340                         while (isspace((buf[strlen(buf)-1]))) {
 341                                 buf[strlen(buf)-1] = 0;
 342                         }
 343                         if (hostname_to_dotted_quad(addrbuf, buf) == 0) {
 344                                 if ((strlen(public_clients) +
 345                                    strlen(addrbuf) + 2)
 346                                    < sizeof(public_clients)) {
 347                                         strcat(public_clients, "|");
 348                                         strcat(public_clients, addrbuf);
 349                                 }
 350                         }
 351                 }
 352                 fclose(fp);
 353                 pc_timestamp = time(NULL);
 354                 end_critical_section(S_PUBLIC_CLIENTS);
 355         }
 356
 357         lprintf(CTDL_DEBUG, "Checking whether %s is a local or public client\n",
 358                 CC->cs_addr);
 359         for (i=0; i<num_parms(public_clients); ++i) {
 360                 extract_token(addrbuf, public_clients, i, '|', sizeof addrbuf);
 361                 if (!strcasecmp(CC->cs_addr, addrbuf)) {
 362                         lprintf(CTDL_DEBUG, "... yes it is.\n");
 363                         return(1);
 364                 }
 365         }
 366
 367         /* No hits.  This is not a public client. */
 368         lprintf(CTDL_DEBUG, "... no it isn't.\n");
 369         return(0);
 370 }
 371
 372
 373 /*
 374  * the client is identifying itself to the server
 375  */
 376 void cmd_iden(char *argbuf)
 377 {
 378         int dev_code;
 379         int cli_code;
 380         int rev_level;
 381         char desc[128];
 382         char from_host[128];
 383         struct in_addr addr;
 384         int do_lookup = 0;
 385
 386         if (num_parms(argbuf)<4) {
 387                 cprintf("%d usage error\n", ERROR + ILLEGAL_VALUE);
 388                 return;
 389         }
 390
 391         dev_code = extract_int(argbuf,0);
 392         cli_code = extract_int(argbuf,1);
 393         rev_level = extract_int(argbuf,2);
 394         extract_token(desc, argbuf, 3, '|', sizeof desc);
 395
 396         safestrncpy(from_host, config.c_fqdn, sizeof from_host);
 397         from_host[sizeof from_host - 1] = 0;
 398         if (num_parms(argbuf)>=5) extract_token(from_host, argbuf, 4, '|', sizeof from_host);
 399
 400         CC->cs_clientdev = dev_code;
 401         CC->cs_clienttyp = cli_code;
 402         CC->cs_clientver = rev_level;
 403         safestrncpy(CC->cs_clientname, desc, sizeof CC->cs_clientname);
 404         CC->cs_clientname[31] = 0;
 405
 406         if (strlen(from_host) > 0) {
 407                 if (CC->is_local_socket) do_lookup = 1;
 408                 else if (is_public_client()) do_lookup = 1;
 409         }
 410
 411         if (do_lookup) {
 412                 lprintf(CTDL_DEBUG, "Looking up hostname '%s'\n", from_host);
 413                 if ((addr.s_addr = inet_addr(from_host)) != -1) {
 414                         locate_host(CC->cs_host, sizeof CC->cs_host,
 415                                 CC->cs_addr, sizeof CC->cs_addr,
 416                                 &addr);
 417                 }
 418                 else {
 419                         safestrncpy(CC->cs_host, from_host, sizeof CC->cs_host);
 420                         CC->cs_host[sizeof CC->cs_host - 1] = 0;
 421                 }
 422         }
 423
 424         lprintf(CTDL_NOTICE, "Client %d/%d/%01d.%02d (%s) from %s\n",
 425                 dev_code,
 426                 cli_code,
 427                 (rev_level / 100),
 428                 (rev_level % 100),
 429                 desc,
 430                 CC->cs_host);
 431         cprintf("%d Ok\n",CIT_OK);
 432 }
 433
 434
 435 /*
 436  * display system messages or help
 437  */
 438 void cmd_mesg(char *mname)
 439 {
 440         FILE *mfp;
 441         char targ[256];
 442         char buf[256];
 443         char buf2[256];
 444         char *dirs[2];
 445         DIR *dp;
 446         struct dirent *d;
 447
 448         extract_token(buf, mname, 0, '|', sizeof buf);
 449
 450         dirs[0] = strdup(ctdl_message_dir);
 451         dirs[1] = strdup(ctdl_hlp_dir);
 452
 453         snprintf(buf2, sizeof buf2, "%s.%d.%d",
 454                 buf, CC->cs_clientdev, CC->cs_clienttyp);
 455
 456         /* If the client requested "?" then produce a listing */
 457         if (!strcmp(buf, "?")) {
 458                 cprintf("%d %s\n", LISTING_FOLLOWS, buf);
 459                 dp = opendir(dirs[1]);
 460                 if (dp != NULL) {
 461                         while (d = readdir(dp), d != NULL) {
 462                                 if (d->d_name[0] != '.') {
 463                                         cprintf(" %s\n", d->d_name);
 464                                 }
 465                         }
 466                         closedir(dp);
 467                 }
 468                 cprintf("000\n");
 469                 free(dirs[0]);
 470                 free(dirs[1]);
 471                 return;
 472         }
 473
 474         /* Otherwise, look for the requested file by name. */
 475         else {
 476                 mesg_locate(targ, sizeof targ, buf2, 2, (const char **)dirs);
 477                 if (strlen(targ) == 0) {
 478                         snprintf(buf2, sizeof buf2, "%s.%d",
 479                                                         buf, CC->cs_clientdev);
 480                         mesg_locate(targ, sizeof targ, buf2, 2,
 481                                                         (const char **)dirs);
 482                         if (strlen(targ) == 0) {
 483                                 mesg_locate(targ, sizeof targ, buf, 2,
 484                                                         (const char **)dirs);
 485                         }
 486                 }
 487         }
 488
 489         free(dirs[0]);
 490         free(dirs[1]);
 491
 492         if (strlen(targ)==0) {
 493                 cprintf("%d '%s' not found.  (Searching in %s and %s)\n",
 494                         ERROR + FILE_NOT_FOUND,
 495                         mname,
 496                         ctdl_message_dir,
 497                         ctdl_hlp_dir
 498                 );
 499                 return;
 500         }
 501
 502         mfp = fopen(targ, "r");
 503         if (mfp==NULL) {
 504                 cprintf("%d Cannot open '%s': %s\n",
 505                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 506                 return;
 507         }
 508         cprintf("%d %s\n", LISTING_FOLLOWS,buf);
 509
 510         while (fgets(buf, (sizeof buf - 1), mfp) != NULL) {
 511                 buf[strlen(buf)-1] = 0;
 512                 do_help_subst(buf);
 513                 cprintf("%s\n",buf);
 514         }
 515
 516         fclose(mfp);
 517         cprintf("000\n");
 518 }
 519
 520
 521 /*
 522  * enter system messages or help
 523  */
 524 void cmd_emsg(char *mname)
 525 {
 526         FILE *mfp;
 527         char targ[256];
 528         char buf[256];
 529         char *dirs[2];
 530         int a;
 531
 532         unbuffer_output();
 533
 534         if (CtdlAccessCheck(ac_aide)) return;
 535
 536         extract_token(buf, mname, 0, '|', sizeof buf);
 537         for (a=0; a<strlen(buf); ++a) {         /* security measure */
 538                 if (buf[a] == '/') buf[a] = '.';
 539         }
 540
 541         dirs[0] = strdup(ctdl_message_dir);
 542         dirs[1] = strdup(ctdl_hlp_dir);
 543
 544         mesg_locate(targ, sizeof targ, buf, 2, (const char**)dirs);
 545         free(dirs[0]);
 546         free(dirs[1]);
 547
 548         if (strlen(targ)==0) {
 549                 snprintf(targ, sizeof targ,
 550                                  "%s/%s",
 551                                  ctdl_hlp_dir, buf);
 552         }
 553
 554         mfp = fopen(targ,"w");
 555         if (mfp==NULL) {
 556                 cprintf("%d Cannot open '%s': %s\n",
 557                         ERROR + INTERNAL_ERROR, targ, strerror(errno));
 558                 return;
 559         }
 560         cprintf("%d %s\n", SEND_LISTING, targ);
 561
 562         while (client_getln(buf, sizeof buf), strcmp(buf, "000")) {
 563                 fprintf(mfp, "%s\n", buf);
 564         }
 565
 566         fclose(mfp);
 567 }
 568
 569
 570 /* Don't show the names of private rooms unless the viewing
 571  * user also knows the rooms.
 572  */
 573 void GenerateRoomDisplay(char *real_room,
 574                         struct CitContext *viewed,
 575                         struct CitContext *viewer) {
 576
 577         int ra;
 578
 579         strcpy(real_room, viewed->room.QRname);
 580         if (viewed->room.QRflags & QR_MAILBOX) {
 581                 strcpy(real_room, &real_room[11]);
 582         }
 583         if (viewed->room.QRflags & QR_PRIVATE) {
 584                 CtdlRoomAccess(&viewed->room, &viewer->user, &ra, NULL);
 585                 if ( (ra & UA_KNOWN) == 0) {
 586                         strcpy(real_room, "<private room>");
 587                 }
 588         }
 589
 590         if (viewed->cs_flags & CS_CHAT) {
 591                 while (strlen(real_room) < 14)
 592                         strcat(real_room, " ");
 593
 594                 strcpy(&real_room[14], "<chat>");
 595         }
 596
 597 }
 598
 599 /*
 600  * Convenience function.
 601  */
 602 int CtdlAccessCheck(int required_level) {
 603
 604         if (CC->internal_pgm) return(0);
 605         if (required_level >= ac_internal) {
 606                 cprintf("%d This is not a user-level command.\n",
 607                         ERROR + HIGHER_ACCESS_REQUIRED);
 608                 return(-1);
 609         }
 610
 611         if ((required_level >= ac_logged_in) && (CC->logged_in == 0)) {
 612                 cprintf("%d Not logged in.\n", ERROR + NOT_LOGGED_IN);
 613                 return(-1);
 614         }
 615
 616         if (CC->user.axlevel >= 6) return(0);
 617         if (required_level >= ac_aide) {
 618                 cprintf("%d This command requires Aide access.\n",
 619                         ERROR + HIGHER_ACCESS_REQUIRED);
 620                 return(-1);
 621         }
 622
 623         if (is_room_aide()) return(0);
 624         if (required_level >= ac_room_aide) {
 625                 cprintf("%d This command requires Aide or Room Aide access.\n",
 626                         ERROR + HIGHER_ACCESS_REQUIRED);
 627                 return(-1);
 628         }
 629
 630         /* shhh ... succeed quietly */
 631         return(0);
 632 }
 633
 634
 635
 636 /*
 637  * Terminate another running session
 638  */
 639 void cmd_term(char *cmdbuf)
 640 {
 641         int session_num;
 642         struct CitContext *ccptr;
 643         int found_it = 0;
 644         int allowed = 0;
 645
 646         session_num = extract_int(cmdbuf, 0);
 647         if (session_num == CC->cs_pid) {
 648                 cprintf("%d You can't kill your own session.\n", ERROR + ILLEGAL_VALUE);
 649                 return;
 650         }
 651
 652         lprintf(CTDL_DEBUG, "Locating session to kill\n");
 653         begin_critical_section(S_SESSION_TABLE);
 654         for (ccptr = ContextList; ccptr != NULL; ccptr = ccptr->next) {
 655                 if (session_num == ccptr->cs_pid) {
 656                         found_it = 1;
 657                         if ((ccptr->user.usernum == CC->user.usernum)
 658                            || (CC->user.axlevel >= 6)) {
 659                                 allowed = 1;
 660                                 ccptr->kill_me = 1;
 661                         }
 662                         else {
 663                                 allowed = 0;
 664                         }
 665                 }
 666         }
 667         end_critical_section(S_SESSION_TABLE);
 668
 669         if (found_it) {
 670                 if (allowed) {
 671                         cprintf("%d Session terminated.\n", CIT_OK);
 672                 }
 673                 else {
 674                         cprintf("%d You are not allowed to do that.\n",
 675                                 ERROR + HIGHER_ACCESS_REQUIRED);
 676                 }
 677         }
 678         else {
 679                 cprintf("%d No such session.\n", ERROR + ILLEGAL_VALUE);
 680         }
 681 }
 682
 683
 684
 685
 686
 687 /*
 688  * get the paginator prompt
 689  */
 690 void cmd_more(void) {
 691         cprintf("%d %s\n", CIT_OK, config.c_moreprompt);
 692 }
 693
 694 /*
 695  * echo
 696  */
 697 void cmd_echo(char *etext)
 698 {
 699         cprintf("%d %s\n", CIT_OK, etext);
 700 }
 701
 702
 703
 704 /*
 705  * identify as internal program
 706  */
 707 void cmd_ipgm(char *argbuf)
 708 {
 709         int secret;
 710
 711         secret = extract_int(argbuf, 0);
 712
 713         /* For security reasons, we do NOT allow this command to run
 714          * over the network.  Local sockets only.
 715          */
 716         if (!CC->is_local_socket) {
 717                 sleep(5);
 718                 cprintf("%d Authentication failed.\n",
 719                         ERROR + PASSWORD_REQUIRED);
 720         }
 721         else if (secret == config.c_ipgm_secret) {
 722                 CC->internal_pgm = 1;
 723                 strcpy(CC->curr_user, "<internal program>");
 724                 CC->cs_flags = CC->cs_flags|CS_STEALTH;
 725                 cprintf("%d Authenticated as an internal program.\n", CIT_OK);
 726         }
 727         else {
 728                 sleep(5);
 729                 cprintf("%d Authentication failed.\n",
 730                         ERROR + PASSWORD_REQUIRED);
 731                 lprintf(CTDL_ERR, "Warning: ipgm authentication failed.\n");
 732                 CC->kill_me = 1;
 733         }
 734
 735         /* Now change the ipgm secret for the next round.
 736          * (Disabled because it breaks concurrent scripts.  The fact that
 737          * we no longer accept IPGM over the network should be sufficient
 738          * to prevent brute-force attacks.  If you don't agree, uncomment
 739          * this block.)
 740         get_config();
 741         config.c_ipgm_secret = rand();
 742         put_config();
 743         */
 744 }
 745
 746
 747 /*
 748  * Shut down the server
 749  */
 750 void cmd_down(void) {
 751
 752         if (CtdlAccessCheck(ac_aide)) return;
 753
 754         cprintf("%d Shutting down server.  Goodbye.\n", CIT_OK);
 755         time_to_die = 1;
 756 }
 757
 758 /*
 759  * Halt the server without exiting the server process.
 760  */
 761 void cmd_halt(void) {
 762
 763         if (CtdlAccessCheck(ac_aide)) return;
 764
 765         cprintf("%d Halting server.  Goodbye.\n", CIT_OK);
 766         time_to_die = 1;
 767         shutdown_and_halt = 1;
 768 }
 769
 770 /*
 771  * Schedule or cancel a server shutdown
 772  */
 773 void cmd_scdn(char *argbuf)
 774 {
 775         int new_state;
 776
 777         if (CtdlAccessCheck(ac_aide)) return;
 778
 779         new_state = extract_int(argbuf, 0);
 780         if ((new_state == 0) || (new_state == 1)) {
 781                 ScheduledShutdown = new_state;
 782         }
 783         cprintf("%d %d\n", CIT_OK, ScheduledShutdown);
 784 }
 785
 786
 787 /*
 788  * Set or unset asynchronous protocol mode
 789  */
 790 void cmd_asyn(char *argbuf)
 791 {
 792         int new_state;
 793
 794         new_state = extract_int(argbuf, 0);
 795         if ((new_state == 0) || (new_state == 1)) {
 796                 CC->is_async = new_state;
 797         }
 798         cprintf("%d %d\n", CIT_OK, CC->is_async);
 799 }
 800
 801
 802 /*
 803  * Generate a "nonce" for APOP-style authentication.
 804  *
 805  * RFC 1725 et al specify a PID to be placed in front of the nonce.
 806  * Quoth BTX: That would be stupid.
 807  */
 808 void generate_nonce(struct CitContext *con) {
 809         struct timeval tv;
 810
 811         memset(con->cs_nonce, NONCE_SIZE, 0);
 812         gettimeofday(&tv, NULL);
 813         memset(con->cs_nonce, NONCE_SIZE, 0);
 814         snprintf(con->cs_nonce, NONCE_SIZE, "<%d%ld@%s>",
 815                 rand(), (long)tv.tv_usec, config.c_fqdn);
 816 }
 817
 818
 819
 820
 821 /*
 822  * Back-end function for starting a session
 823  */
 824 void begin_session(struct CitContext *con)
 825 {
 826         socklen_t len;
 827         struct sockaddr_in sin;
 828
 829         /*
 830          * Initialize some variables specific to our context.
 831          */
 832         con->logged_in = 0;
 833         con->internal_pgm = 0;
 834         con->download_fp = NULL;
 835         con->upload_fp = NULL;
 836         con->FirstExpressMessage = NULL;
 837         time(&con->lastcmd);
 838         time(&con->lastidle);
 839         strcpy(con->lastcmdname, "    ");
 840         strcpy(con->cs_clientname, "(unknown)");
 841         strcpy(con->curr_user, NLI);
 842         strcpy(con->net_node, "");
 843         strcpy(con->fake_username, "");
 844         strcpy(con->fake_hostname, "");
 845         strcpy(con->fake_roomname, "");
 846         generate_nonce(con);
 847         safestrncpy(con->cs_host, config.c_fqdn, sizeof con->cs_host);
 848         safestrncpy(con->cs_addr, "", sizeof con->cs_addr);
 849         con->cs_host[sizeof con->cs_host - 1] = 0;
 850         len = sizeof sin;
 851         if (!CC->is_local_socket) {
 852                 if (!getpeername(con->client_socket, (struct sockaddr *) &sin, &len)) {
 853                         locate_host(con->cs_host, sizeof con->cs_host,
 854                                 con->cs_addr, sizeof con->cs_addr,
 855                                 &sin.sin_addr
 856                         );
 857                 }
 858         }
 859         else {
 860                 strcpy(con->cs_host, "");
 861         }
 862         con->cs_flags = 0;
 863         con->upload_type = UPL_FILE;
 864         con->dl_is_net = 0;
 865
 866         con->nologin = 0;
 867         if ((config.c_maxsessions > 0)&&(num_sessions > config.c_maxsessions)) {
 868                 con->nologin = 1;
 869         }
 870
 871         lprintf(CTDL_NOTICE, "Session started.\n");
 872
 873         /* Run any session startup routines registered by loadable modules */
 874         PerformSessionHooks(EVT_START);
 875 }
 876
 877
 878 void citproto_begin_session() {
 879         if (CC->nologin==1) {
 880                 cprintf("%d %s: Too many users are already online (maximum is %d)\n",
 881                         ERROR + MAX_SESSIONS_EXCEEDED,
 882                         config.c_nodename, config.c_maxsessions
 883                 );
 884                 CC->kill_me = 1;
 885         }
 886         else {
 887                 cprintf("%d %s Citadel server ready.\n",
 888                         CIT_OK, config.c_nodename);
 889         }
 890 }
 891
 892
 893
 894
 895 /*
 896  * This loop recognizes all server commands.
 897  */
 898 void do_command_loop(void) {
 899         char cmdbuf[SIZ];
 900
 901         time(&CC->lastcmd);
 902         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 903         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 904                 lprintf(CTDL_ERR, "Client disconnected: ending session.\n");
 905                 CC->kill_me = 1;
 906                 return;
 907         }
 908
 909         /* Log the server command, but don't show passwords... */
 910         if ( (strncasecmp(cmdbuf, "PASS", 4))
 911            && (strncasecmp(cmdbuf, "SETP", 4)) ) {
 912                 lprintf(CTDL_INFO, "%s\n", cmdbuf);
 913         }
 914         else {
 915                 lprintf(CTDL_INFO, "<password command sent>\n");
 916         }
 917
 918         buffer_output();
 919
 920         /*
 921          * Let other clients see the last command we executed, and
 922          * update the idle time, but not NOOP, QNOP, PEXP, GEXP, RWHO, or TIME.
 923          */
 924         if ( (strncasecmp(cmdbuf, "NOOP", 4))
 925            && (strncasecmp(cmdbuf, "QNOP", 4))
 926            && (strncasecmp(cmdbuf, "PEXP", 4))
 927            && (strncasecmp(cmdbuf, "GEXP", 4))
 928            && (strncasecmp(cmdbuf, "RWHO", 4))
 929            && (strncasecmp(cmdbuf, "TIME", 4)) ) {
 930                 strcpy(CC->lastcmdname, "    ");
 931                 safestrncpy(CC->lastcmdname, cmdbuf, sizeof(CC->lastcmdname));
 932                 time(&CC->lastidle);
 933         }
 934
 935         if ((strncasecmp(cmdbuf, "ENT0", 4))
 936            && (strncasecmp(cmdbuf, "MESG", 4))
 937            && (strncasecmp(cmdbuf, "MSGS", 4)))
 938         {
 939            CC->cs_flags &= ~CS_POSTING;
 940         }
 941
 942         if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 943                 cprintf("%d%cok\n", CIT_OK, CtdlCheckExpress() );
 944         }
 945
 946         else if (!strncasecmp(cmdbuf, "QNOP", 4)) {
 947                 /* do nothing, this command returns no response */
 948         }
 949
 950         else if (!strncasecmp(cmdbuf,"QUIT",4)) {
 951                 cprintf("%d Goodbye.\n", CIT_OK);
 952                 CC->kill_me = 1;
 953         }
 954
 955         else if (!strncasecmp(cmdbuf,"ASYN",4)) {
 956                 cmd_asyn(&cmdbuf[5]);
 957         }
 958
 959         else if (!strncasecmp(cmdbuf,"LOUT",4)) {
 960                 if (CC->logged_in) logout(CC);
 961                 cprintf("%d logged out.\n", CIT_OK);
 962         }
 963
 964         else if (!strncasecmp(cmdbuf,"USER",4)) {
 965                 cmd_user(&cmdbuf[5]);
 966         }
 967
 968         else if (!strncasecmp(cmdbuf,"PASS",4)) {
 969                 cmd_pass(&cmdbuf[5]);
 970         }
 971
 972         else if (!strncasecmp(cmdbuf,"NEWU",4)) {
 973                 cmd_newu(&cmdbuf[5]);
 974         }
 975
 976         else if (!strncasecmp(cmdbuf,"CREU",4)) {
 977                 cmd_creu(&cmdbuf[5]);
 978         }
 979
 980         else if (!strncasecmp(cmdbuf,"SETP",4)) {
 981                 cmd_setp(&cmdbuf[5]);
 982         }
 983
 984         else if (!strncasecmp(cmdbuf,"LRMS",4)) {
 985                 cmd_lrms(&cmdbuf[5]);
 986         }
 987
 988         else if (!strncasecmp(cmdbuf,"LKRA",4)) {
 989                 cmd_lkra(&cmdbuf[5]);
 990         }
 991
 992         else if (!strncasecmp(cmdbuf,"LKRN",4)) {
 993                 cmd_lkrn(&cmdbuf[5]);
 994         }
 995
 996         else if (!strncasecmp(cmdbuf,"LKRO",4)) {
 997                 cmd_lkro(&cmdbuf[5]);
 998         }
 999
1000         else if (!strncasecmp(cmdbuf,"LZRM",4)) {
1001                 cmd_lzrm(&cmdbuf[5]);
1002         }
1003
1004         else if (!strncasecmp(cmdbuf,"LPRM",4)) {
1005                 cmd_lprm(&cmdbuf[5]);
1006         }
1007
1008         else if (!strncasecmp(cmdbuf,"GETU",4)) {
1009                 cmd_getu();
1010         }
1011
1012         else if (!strncasecmp(cmdbuf,"SETU",4)) {
1013                 cmd_setu(&cmdbuf[5]);
1014         }
1015
1016         else if (!strncasecmp(cmdbuf,"GOTO",4)) {
1017                 cmd_goto(&cmdbuf[5]);
1018         }
1019
1020         else if (!strncasecmp(cmdbuf,"MSGS",4)) {
1021                 cmd_msgs(&cmdbuf[5]);
1022         }
1023
1024         else if (!strncasecmp(cmdbuf,"WHOK",4)) {
1025                 cmd_whok();
1026         }
1027
1028         else if (!strncasecmp(cmdbuf,"RDIR",4)) {
1029                 cmd_rdir();
1030         }
1031
1032         else if (!strncasecmp(cmdbuf,"EUID",4)) {
1033                 cmd_euid(&cmdbuf[5]);
1034         }
1035
1036         else if (!strncasecmp(cmdbuf,"MSG0",4)) {
1037                 cmd_msg0(&cmdbuf[5]);
1038         }
1039
1040         else if (!strncasecmp(cmdbuf,"MSG2",4)) {
1041                 cmd_msg2(&cmdbuf[5]);
1042         }
1043
1044         else if (!strncasecmp(cmdbuf,"MSG3",4)) {
1045                 cmd_msg3(&cmdbuf[5]);
1046         }
1047
1048         else if (!strncasecmp(cmdbuf,"MSG4",4)) {
1049                 cmd_msg4(&cmdbuf[5]);
1050         }
1051
1052         else if (!strncasecmp(cmdbuf,"MSGP",4)) {
1053                 cmd_msgp(&cmdbuf[5]);
1054         }
1055
1056         else if (!strncasecmp(cmdbuf,"OPNA",4)) {
1057                 cmd_opna(&cmdbuf[5]);
1058         }
1059
1060         else if (!strncasecmp(cmdbuf,"DLAT",4)) {
1061                 cmd_dlat(&cmdbuf[5]);
1062         }
1063
1064         else if (!strncasecmp(cmdbuf,"INFO",4)) {
1065                 cmd_info();
1066         }
1067
1068         else if (!strncasecmp(cmdbuf,"SLRP",4)) {
1069                 cmd_slrp(&cmdbuf[5]);
1070         }
1071
1072         else if (!strncasecmp(cmdbuf,"INVT",4)) {
1073                 cmd_invt_kick(&cmdbuf[5],1);
1074         }
1075
1076         else if (!strncasecmp(cmdbuf,"KICK",4)) {
1077                 cmd_invt_kick(&cmdbuf[5],0);
1078         }
1079
1080         else if (!strncasecmp(cmdbuf,"GETR",4)) {
1081                 cmd_getr();
1082         }
1083
1084         else if (!strncasecmp(cmdbuf,"SETR",4)) {
1085                 cmd_setr(&cmdbuf[5]);
1086         }
1087
1088         else if (!strncasecmp(cmdbuf,"GETA",4)) {
1089                 cmd_geta();
1090         }
1091
1092         else if (!strncasecmp(cmdbuf,"SETA",4)) {
1093                 cmd_seta(&cmdbuf[5]);
1094         }
1095
1096         else if (!strncasecmp(cmdbuf,"ENT0",4)) {
1097                 cmd_ent0(&cmdbuf[5]);
1098         }
1099
1100         else if (!strncasecmp(cmdbuf,"RINF",4)) {
1101                 cmd_rinf();
1102         }
1103
1104         else if (!strncasecmp(cmdbuf,"DELE",4)) {
1105                 cmd_dele(&cmdbuf[5]);
1106         }
1107
1108         else if (!strncasecmp(cmdbuf,"KILL",4)) {
1109                 cmd_kill(&cmdbuf[5]);
1110         }
1111
1112         else if (!strncasecmp(cmdbuf,"CRE8",4)) {
1113                 cmd_cre8(&cmdbuf[5]);
1114         }
1115
1116         else if (!strncasecmp(cmdbuf,"MOVE",4)) {
1117                 cmd_move(&cmdbuf[5]);
1118         }
1119
1120         else if (!strncasecmp(cmdbuf,"FORG",4)) {
1121                 cmd_forg();
1122         }
1123
1124         else if (!strncasecmp(cmdbuf,"MESG",4)) {
1125                 cmd_mesg(&cmdbuf[5]);
1126         }
1127
1128         else if (!strncasecmp(cmdbuf,"EMSG",4)) {
1129                 cmd_emsg(&cmdbuf[5]);
1130         }
1131
1132         else if (!strncasecmp(cmdbuf,"GNUR",4)) {
1133                 cmd_gnur();
1134         }
1135
1136         else if (!strncasecmp(cmdbuf,"VALI",4)) {
1137                 cmd_vali(&cmdbuf[5]);
1138         }
1139
1140         else if (!strncasecmp(cmdbuf,"EINF",4)) {
1141                 cmd_einf(&cmdbuf[5]);
1142         }
1143
1144         else if (!strncasecmp(cmdbuf,"LIST",4)) {
1145                 cmd_list(&cmdbuf[5]);
1146         }
1147
1148         else if (!strncasecmp(cmdbuf,"CHEK",4)) {
1149                 cmd_chek();
1150         }
1151
1152         else if (!strncasecmp(cmdbuf,"DELF",4)) {
1153                 cmd_delf(&cmdbuf[5]);
1154         }
1155
1156         else if (!strncasecmp(cmdbuf,"MOVF",4)) {
1157                 cmd_movf(&cmdbuf[5]);
1158         }
1159
1160         else if (!strncasecmp(cmdbuf,"NETF",4)) {
1161                 cmd_netf(&cmdbuf[5]);
1162         }
1163
1164         else if (!strncasecmp(cmdbuf,"OPEN",4)) {
1165                 cmd_open(&cmdbuf[5]);
1166         }
1167
1168         else if (!strncasecmp(cmdbuf,"CLOS",4)) {
1169                 cmd_clos();
1170         }
1171
1172         else if (!strncasecmp(cmdbuf,"UOPN",4)) {
1173                 cmd_uopn(&cmdbuf[5]);
1174         }
1175
1176         else if (!strncasecmp(cmdbuf,"UCLS",4)) {
1177                 cmd_ucls(&cmdbuf[5]);
1178         }
1179
1180         else if (!strncasecmp(cmdbuf,"READ",4)) {
1181                 cmd_read(&cmdbuf[5]);
1182         }
1183
1184         else if (!strncasecmp(cmdbuf,"WRIT",4)) {
1185                 cmd_writ(&cmdbuf[5]);
1186         }
1187
1188         else if (!strncasecmp(cmdbuf,"QUSR",4)) {
1189                 cmd_qusr(&cmdbuf[5]);
1190         }
1191
1192         else if (!strncasecmp(cmdbuf,"ECHO",4)) {
1193                 cmd_echo(&cmdbuf[5]);
1194         }
1195
1196         else if (!strncasecmp(cmdbuf,"OIMG",4)) {
1197                 cmd_oimg(&cmdbuf[5]);
1198         }
1199
1200         else if (!strncasecmp(cmdbuf,"MORE",4)) {
1201                 cmd_more();
1202         }
1203
1204         else if (!strncasecmp(cmdbuf,"NDOP",4)) {
1205                 cmd_ndop(&cmdbuf[5]);
1206         }
1207
1208         else if (!strncasecmp(cmdbuf,"NUOP",4)) {
1209                 cmd_nuop(&cmdbuf[5]);
1210         }
1211
1212         else if (!strncasecmp(cmdbuf,"LFLR",4)) {
1213                 cmd_lflr();
1214         }
1215
1216         else if (!strncasecmp(cmdbuf,"CFLR",4)) {
1217                 cmd_cflr(&cmdbuf[5]);
1218         }
1219
1220         else if (!strncasecmp(cmdbuf,"KFLR",4)) {
1221                 cmd_kflr(&cmdbuf[5]);
1222         }
1223
1224         else if (!strncasecmp(cmdbuf,"EFLR",4)) {
1225                 cmd_eflr(&cmdbuf[5]);
1226         }
1227
1228         else if (!strncasecmp(cmdbuf,"IDEN",4)) {
1229                 cmd_iden(&cmdbuf[5]);
1230         }
1231
1232         else if (!strncasecmp(cmdbuf,"IPGM",4)) {
1233                 cmd_ipgm(&cmdbuf[5]);
1234         }
1235
1236         else if (!strncasecmp(cmdbuf,"TERM",4)) {
1237                 cmd_term(&cmdbuf[5]);
1238         }
1239
1240         else if (!strncasecmp(cmdbuf,"DOWN",4)) {
1241                 cmd_down();
1242         }
1243
1244         else if (!strncasecmp(cmdbuf,"HALT",4)) {
1245                 cmd_halt();
1246         }
1247
1248         else if (!strncasecmp(cmdbuf,"SCDN",4)) {
1249                 cmd_scdn(&cmdbuf[5]);
1250         }
1251
1252         else if (!strncasecmp(cmdbuf, "UIMG", 4)) {
1253                 cmd_uimg(&cmdbuf[5]);
1254         }
1255
1256         else if (!strncasecmp(cmdbuf, "TIME", 4)) {
1257                 cmd_time();
1258         }
1259
1260         else if (!strncasecmp(cmdbuf, "AGUP", 4)) {
1261                 cmd_agup(&cmdbuf[5]);
1262         }
1263
1264         else if (!strncasecmp(cmdbuf, "ASUP", 4)) {
1265                 cmd_asup(&cmdbuf[5]);
1266         }
1267
1268         else if (!strncasecmp(cmdbuf, "GPEX", 4)) {
1269                 cmd_gpex(&cmdbuf[5]);
1270         }
1271
1272         else if (!strncasecmp(cmdbuf, "SPEX", 4)) {
1273                 cmd_spex(&cmdbuf[5]);
1274         }
1275
1276         else if (!strncasecmp(cmdbuf, "CONF", 4)) {
1277                 cmd_conf(&cmdbuf[5]);
1278         }
1279
1280         else if (!strncasecmp(cmdbuf, "SEEN", 4)) {
1281                 cmd_seen(&cmdbuf[5]);
1282         }
1283
1284         else if (!strncasecmp(cmdbuf, "GTSN", 4)) {
1285                 cmd_gtsn(&cmdbuf[5]);
1286         }
1287
1288         else if (!strncasecmp(cmdbuf, "VIEW", 4)) {
1289                 cmd_view(&cmdbuf[5]);
1290         }
1291
1292         else if (!strncasecmp(cmdbuf, "ISME", 4)) {
1293                 cmd_isme(&cmdbuf[5]);
1294         }
1295
1296         else if (!DLoader_Exec_Cmd(cmdbuf)) {
1297                 cprintf("%d Unrecognized or unsupported command.\n",
1298                         ERROR + CMD_NOT_SUPPORTED);
1299                }
1300
1301         unbuffer_output();
1302
1303         /* Run any after-each-command routines registered by modules */
1304         PerformSessionHooks(EVT_CMD);
1305 }
1306
1307
1308 /*
1309  * This loop performs all asynchronous functions.
1310  */
1311 void do_async_loop(void) {
1312         PerformSessionHooks(EVT_ASYNC);
1313 }