source/smbd/service.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 1.9.
   4    service (connection) opening and closing
   5    Copyright (C) Andrew Tridgell 1992-1998
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 extern int DEBUGLEVEL;
  25
  26 extern struct timeval smb_last_time;
  27 extern int case_default;
  28 extern BOOL case_preserve;
  29 extern BOOL short_case_preserve;
  30 extern BOOL case_mangle;
  31 extern BOOL case_sensitive;
  32 extern BOOL use_mangled_map;
  33 extern fstring remote_machine;
  34 extern pstring sesssetup_user;
  35 extern fstring remote_machine;
  36
  37
  38 /****************************************************************************
  39 load parameters specific to a connection/service
  40 ****************************************************************************/
  41 BOOL become_service(connection_struct *conn,BOOL do_chdir)
  42 {
  43         extern char magic_char;
  44         static connection_struct *last_conn;
  45         int snum;
  46
  47         if (!conn)  {
  48                 last_conn = NULL;
  49                 return(False);
  50         }
  51
  52         conn->lastused = smb_last_time.tv_sec;
  53
  54         snum = SNUM(conn);
  55
  56         if (do_chdir &&
  57             dos_ChDir(conn->connectpath) != 0 &&
  58             dos_ChDir(conn->origpath) != 0) {
  59                 DEBUG(0,("chdir (%s) failed\n",
  60                          conn->connectpath));
  61                 return(False);
  62         }
  63
  64         if (conn == last_conn)
  65                 return(True);
  66
  67         last_conn = conn;
  68
  69         case_default = lp_defaultcase(snum);
  70         case_preserve = lp_preservecase(snum);
  71         short_case_preserve = lp_shortpreservecase(snum);
  72         case_mangle = lp_casemangle(snum);
  73         case_sensitive = lp_casesensitive(snum);
  74         magic_char = lp_magicchar(snum);
  75         use_mangled_map = (*lp_mangled_map(snum) ? True:False);
  76         return(True);
  77 }
  78
  79
  80 /****************************************************************************
  81   find a service entry
  82 ****************************************************************************/
  83 int find_service(char *service)
  84 {
  85    int iService;
  86
  87    all_string_sub(service,"\\","/",0);
  88
  89    iService = lp_servicenumber(service);
  90
  91    /* now handle the special case of a home directory */
  92    if (iService < 0)
  93    {
  94       char *phome_dir = get_user_home_dir(service);
  95
  96       if(!phome_dir)
  97       {
  98         /*
  99          * Try mapping the servicename, it may
 100          * be a Windows to unix mapped user name.
 101          */
 102         if(map_username(service))
 103           phome_dir = get_user_home_dir(service);
 104       }
 105
 106       DEBUG(3,("checking for home directory %s gave %s\n",service,
 107             phome_dir?phome_dir:"(NULL)"));
 108
 109       if (phome_dir)
 110       {
 111         int iHomeService;
 112         if ((iHomeService = lp_servicenumber(HOMES_NAME)) >= 0)
 113         {
 114           lp_add_home(service,iHomeService,phome_dir);
 115           iService = lp_servicenumber(service);
 116         }
 117       }
 118    }
 119
 120    /* If we still don't have a service, attempt to add it as a printer. */
 121    if (iService < 0)
 122    {
 123       int iPrinterService;
 124
 125       if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) >= 0)
 126       {
 127          char *pszTemp;
 128
 129          DEBUG(3,("checking whether %s is a valid printer name...\n", service));
 130          pszTemp = PRINTCAP;
 131          if ((pszTemp != NULL) && pcap_printername_ok(service, pszTemp))
 132          {
 133             DEBUG(3,("%s is a valid printer name\n", service));
 134             DEBUG(3,("adding %s as a printer service\n", service));
 135             lp_add_printer(service,iPrinterService);
 136             iService = lp_servicenumber(service);
 137             if (iService < 0)
 138                DEBUG(0,("failed to add %s as a printer service!\n", service));
 139          }
 140          else
 141             DEBUG(3,("%s is not a valid printer name\n", service));
 142       }
 143    }
 144
 145    /* just possibly it's a default service? */
 146    if (iService < 0)
 147    {
 148      char *pdefservice = lp_defaultservice();
 149      if (pdefservice && *pdefservice &&
 150          !strequal(pdefservice,service) &&
 151          !strstr(service,".."))
 152      {
 153        /*
 154         * We need to do a local copy here as lp_defaultservice()
 155         * returns one of the rotating lp_string buffers that
 156         * could get overwritten by the recursive find_service() call
 157         * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
 158         */
 159        pstring defservice;
 160        pstrcpy(defservice, pdefservice);
 161        iService = find_service(defservice);
 162        if (iService >= 0)
 163        {
 164          all_string_sub(service,"_","/",0);
 165          iService = lp_add_service(service,iService);
 166        }
 167      }
 168    }
 169
 170    if (iService >= 0)
 171      if (!VALID_SNUM(iService))
 172      {
 173        DEBUG(0,("Invalid snum %d for %s\n",iService,service));
 174        iService = -1;
 175      }
 176
 177    if (iService < 0)
 178      DEBUG(3,("find_service() failed to find service %s\n", service));
 179
 180    return (iService);
 181 }
 182
 183
 184 /****************************************************************************
 185   make a connection to a service
 186 ****************************************************************************/
 187 connection_struct *make_connection(char *service,char *user,char *password, int pwlen, char *dev,uint16 vuid, int *ecode)
 188 {
 189         int snum;
 190         struct passwd *pass = NULL;
 191         BOOL guest = False;
 192         BOOL force = False;
 193         extern int Client;
 194         connection_struct *conn;
 195         int ret;
 196
 197         strlower(service);
 198
 199         snum = find_service(service);
 200         if (snum < 0) {
 201                 extern int Client;
 202                 if (strequal(service,"IPC$")) {
 203                         DEBUG(3,("refusing IPC connection\n"));
 204                         *ecode = ERRnoipc;
 205                         return NULL;
 206                 }
 207
 208                 DEBUG(0,("%s (%s) couldn't find service %s\n",
 209                          remote_machine, client_addr(Client), service));
 210                 *ecode = ERRinvnetname;
 211                 return NULL;
 212         }
 213
 214         if (strequal(service,HOMES_NAME)) {
 215                 if (*user && Get_Pwnam(user,True)) {
 216                         fstring dos_username;
 217                         fstrcpy(dos_username, user);
 218                         unix_to_dos(dos_username, True);
 219                         return(make_connection(dos_username,user,password,
 220                                                pwlen,dev,vuid,ecode));
 221                 }
 222
 223                 if(lp_security() != SEC_SHARE) {
 224                         if (validated_username(vuid)) {
 225                                 fstring dos_username;
 226                                 fstrcpy(user,validated_username(vuid));
 227                                 fstrcpy(dos_username, user);
 228                                 unix_to_dos(dos_username, True);
 229                                 return(make_connection(dos_username,user,password,pwlen,dev,vuid,ecode));
 230                         }
 231                 } else {
 232                         /* Security = share. Try with sesssetup_user
 233                          * as the username.  */
 234                         if(*sesssetup_user) {
 235                                 fstring dos_username;
 236                                 fstrcpy(user,sesssetup_user);
 237                                 fstrcpy(dos_username, user);
 238                                 unix_to_dos(dos_username, True);
 239                                 return(make_connection(dos_username,user,password,pwlen,dev,vuid,ecode));
 240                         }
 241                 }
 242         }
 243
 244         if (!lp_snum_ok(snum) ||
 245             !check_access(Client,
 246                           lp_hostsallow(snum), lp_hostsdeny(snum))) {
 247                 *ecode = ERRaccess;
 248                 return NULL;
 249         }
 250
 251         /* you can only connect to the IPC$ service as an ipc device */
 252         if (strequal(service,"IPC$"))
 253                 pstrcpy(dev,"IPC");
 254
 255         if (*dev == '?' || !*dev) {
 256                 if (lp_print_ok(snum)) {
 257                         pstrcpy(dev,"LPT1:");
 258                 } else {
 259                         pstrcpy(dev,"A:");
 260                 }
 261         }
 262
 263         /* if the request is as a printer and you can't print then refuse */
 264         strupper(dev);
 265         if (!lp_print_ok(snum) && (strncmp(dev,"LPT",3) == 0)) {
 266                 DEBUG(1,("Attempt to connect to non-printer as a printer\n"));
 267                 *ecode = ERRinvdevice;
 268                 return NULL;
 269         }
 270
 271         /* lowercase the user name */
 272         strlower(user);
 273
 274         /* add it as a possible user name */
 275         add_session_user(service);
 276
 277         /* shall we let them in? */
 278         if (!authorise_login(snum,user,password,pwlen,&guest,&force,vuid)) {
 279                 DEBUG( 2, ( "Invalid username/password for %s\n", service ) );
 280                 *ecode = ERRbadpw;
 281                 return NULL;
 282         }
 283
 284         conn = conn_new();
 285         if (!conn) {
 286                 DEBUG(0,("Couldn't find free connection.\n"));
 287                 *ecode = ERRnoresource;
 288                 conn_free(conn);
 289                 return NULL;
 290         }
 291
 292         /* find out some info about the user */
 293         pass = Get_Pwnam(user,True);
 294
 295         if (pass == NULL) {
 296                 DEBUG(0,( "Couldn't find account %s\n",user));
 297                 *ecode = ERRbaduid;
 298                 conn_free(conn);
 299                 return NULL;
 300         }
 301
 302         conn->read_only = lp_readonly(snum);
 303
 304         {
 305                 pstring list;
 306                 StrnCpy(list,lp_readlist(snum),sizeof(pstring)-1);
 307                 pstring_sub(list,"%S",service);
 308
 309                 if (user_in_list(user,list))
 310                         conn->read_only = True;
 311
 312                 StrnCpy(list,lp_writelist(snum),sizeof(pstring)-1);
 313                 pstring_sub(list,"%S",service);
 314
 315                 if (user_in_list(user,list))
 316                         conn->read_only = False;
 317         }
 318
 319         /* admin user check */
 320
 321         /* JRA - original code denied admin user if the share was
 322            marked read_only. Changed as I don't think this is needed,
 323            but old code left in case there is a problem here.
 324         */
 325         if (user_in_list(user,lp_admin_users(snum))
 326 #if 0
 327             && !conn->read_only
 328 #endif
 329             ) {
 330                 conn->admin_user = True;
 331                 DEBUG(0,("%s logged in as admin user (root privileges)\n",user));
 332         } else {
 333                 conn->admin_user = False;
 334         }
 335
 336         conn->force_user = force;
 337         conn->vuid = vuid;
 338         conn->uid = pass->pw_uid;
 339         conn->gid = pass->pw_gid;
 340         safe_strcpy(conn->client_address, client_addr(Client), sizeof(conn->client_address)-1);
 341         conn->num_files_open = 0;
 342         conn->lastused = time(NULL);
 343         conn->service = snum;
 344         conn->used = True;
 345         conn->printer = (strncmp(dev,"LPT",3) == 0);
 346         conn->ipc = (strncmp(dev,"IPC",3) == 0);
 347         conn->dirptr = NULL;
 348         conn->veto_list = NULL;
 349         conn->hide_list = NULL;
 350         conn->veto_oplock_list = NULL;
 351         string_set(&conn->dirpath,"");
 352         string_set(&conn->user,user);
 353
 354         /*
 355          * If force user is true, then store the
 356          * given userid and also the primary groupid
 357          * of the user we're forcing.
 358          */
 359
 360         if (*lp_force_user(snum)) {
 361                 struct passwd *pass2;
 362                 pstring fuser;
 363                 pstrcpy(fuser,lp_force_user(snum));
 364
 365                 /* Allow %S to be used by force user. */
 366                 pstring_sub(fuser,"%S",service);
 367
 368                 pass2 = (struct passwd *)Get_Pwnam(fuser,True);
 369                 if (pass2) {
 370                         conn->uid = pass2->pw_uid;
 371                         conn->gid = pass2->pw_gid;
 372                         string_set(&conn->user,fuser);
 373                         fstrcpy(user,fuser);
 374                         conn->force_user = True;
 375                         DEBUG(3,("Forced user %s\n",fuser));
 376                 } else {
 377                         DEBUG(1,("Couldn't find user %s\n",fuser));
 378                 }
 379         }
 380
 381 #ifdef HAVE_GETGRNAM
 382         /*
 383          * If force group is true, then override
 384          * any groupid stored for the connecting user.
 385          */
 386
 387         if (*lp_force_group(snum)) {
 388                 struct group *gptr;
 389                 pstring gname;
 390                 pstring tmp_gname;
 391                 BOOL user_must_be_member = False;
 392
 393                 StrnCpy(tmp_gname,lp_force_group(snum),sizeof(pstring)-1);
 394
 395                 if (tmp_gname[0] == '+') {
 396                         user_must_be_member = True;
 397                         StrnCpy(gname,&tmp_gname[1],sizeof(pstring)-2);
 398                 } else {
 399                         StrnCpy(gname,tmp_gname,sizeof(pstring)-1);
 400                 }
 401                 /* default service may be a group name          */
 402                 pstring_sub(gname,"%S",service);
 403                 gptr = (struct group *)getgrnam(gname);
 404
 405                 if (gptr) {
 406                         /*
 407                          * If the user has been forced and the forced group starts
 408                          * with a '+', then we only set the group to be the forced
 409                          * group if the forced user is a member of that group.
 410                          * Otherwise, the meaning of the '+' would be ignored.
 411                          */
 412                         if (conn->force_user && user_must_be_member) {
 413                                 int i;
 414                                 for (i = 0; gptr->gr_mem[i] != NULL; i++) {
 415                                         if (strcmp(user,gptr->gr_mem[i]) == 0) {
 416                                                 conn->gid = gptr->gr_gid;
 417                                                 DEBUG(3,("Forced group %s for member %s\n",gname,user));
 418                                                 break;
 419                                         }
 420                                 }
 421                         } else {
 422                                 conn->gid = gptr->gr_gid;
 423                                 DEBUG(3,("Forced group %s\n",gname));
 424                         }
 425                 } else {
 426                         DEBUG(1,("Couldn't find group %s\n",gname));
 427                 }
 428         }
 429 #endif /* HAVE_GETGRNAM */
 430
 431         {
 432                 pstring s;
 433                 pstrcpy(s,lp_pathname(snum));
 434                 standard_sub(conn,s);
 435                 string_set(&conn->connectpath,s);
 436                 DEBUG(3,("Connect path is %s\n",s));
 437         }
 438
 439         /* groups stuff added by ih */
 440         conn->ngroups = 0;
 441         conn->groups = NULL;
 442
 443         if (!IS_IPC(conn)) {
 444                 /* Find all the groups this uid is in and
 445                    store them. Used by become_user() */
 446                 setup_groups(conn->user,conn->uid,conn->gid,
 447                              &conn->ngroups,&conn->groups);
 448
 449                 /* check number of connections */
 450                 if (!claim_connection(conn,
 451                                       lp_servicename(SNUM(conn)),
 452                                       lp_max_connections(SNUM(conn)),
 453                                       False)) {
 454                         DEBUG(1,("too many connections - rejected\n"));
 455                         *ecode = ERRnoresource;
 456                         conn_free(conn);
 457                         return NULL;
 458                 }
 459
 460                 if (lp_status(SNUM(conn)))
 461                         claim_connection(conn,"STATUS.",
 462                                          MAXSTATUS,False);
 463         } /* IS_IPC */
 464
 465         /* execute any "root preexec = " line */
 466         if (*lp_rootpreexec(SNUM(conn))) {
 467                 pstring cmd;
 468                 pstrcpy(cmd,lp_rootpreexec(SNUM(conn)));
 469                 standard_sub(conn,cmd);
 470                 DEBUG(5,("cmd=%s\n",cmd));
 471                 ret = smbrun(cmd,NULL,False);
 472                 if (ret != 0 && lp_rootpreexec_close(SNUM(conn))) {
 473                         DEBUG(1,("preexec gave %d - failing connection\n", ret));
 474                         conn_free(conn);
 475                         *ecode = ERRsrverror;
 476                         return NULL;
 477                 }
 478         }
 479
 480         if (!become_user(conn, conn->vuid)) {
 481                 DEBUG(0,("Can't become connected user!\n"));
 482                 if (!IS_IPC(conn)) {
 483                         yield_connection(conn,
 484                                          lp_servicename(SNUM(conn)),
 485                                          lp_max_connections(SNUM(conn)));
 486                         if (lp_status(SNUM(conn))) {
 487                                 yield_connection(conn,"STATUS.",MAXSTATUS);
 488                         }
 489                 }
 490                 conn_free(conn);
 491                 *ecode = ERRbadpw;
 492                 return NULL;
 493         }
 494
 495         if (dos_ChDir(conn->connectpath) != 0) {
 496                 DEBUG(0,("Can't change directory to %s (%s)\n",
 497                          conn->connectpath,strerror(errno)));
 498                 unbecome_user();
 499                 if (!IS_IPC(conn)) {
 500                         yield_connection(conn,
 501                                          lp_servicename(SNUM(conn)),
 502                                          lp_max_connections(SNUM(conn)));
 503                         if (lp_status(SNUM(conn)))
 504                                 yield_connection(conn,"STATUS.",MAXSTATUS);
 505                 }
 506                 conn_free(conn);
 507                 *ecode = ERRinvnetname;
 508                 return NULL;
 509         }
 510
 511         string_set(&conn->origpath,conn->connectpath);
 512
 513 #if SOFTLINK_OPTIMISATION
 514         /* resolve any soft links early */
 515         {
 516                 pstring s;
 517                 pstrcpy(s,conn->connectpath);
 518                 dos_GetWd(s);
 519                 string_set(&conn->connectpath,s);
 520                 dos_ChDir(conn->connectpath);
 521         }
 522 #endif
 523
 524         add_session_user(user);
 525
 526         /* execute any "preexec = " line */
 527         if (*lp_preexec(SNUM(conn))) {
 528                 pstring cmd;
 529                 pstrcpy(cmd,lp_preexec(SNUM(conn)));
 530                 standard_sub(conn,cmd);
 531                 ret = smbrun(cmd,NULL,False);
 532                 if (ret != 0 && lp_preexec_close(SNUM(conn))) {
 533                         DEBUG(1,("preexec gave %d - failing connection\n", ret));
 534                         conn_free(conn);
 535                         *ecode = ERRsrverror;
 536                         return NULL;
 537                 }
 538         }
 539
 540         /*
 541          * Print out the 'connected as' stuff here as we need
 542          * to know the effective uid and gid we will be using.
 543          */
 544
 545         if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
 546                 dbgtext( "%s (%s) ", remote_machine, conn->client_address );
 547                 dbgtext( "connect to service %s ", lp_servicename(SNUM(conn)) );
 548                 dbgtext( "as user %s ", user );
 549                 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
 550                 dbgtext( "(pid %d)\n", (int)getpid() );
 551         }
 552
 553         /* we've finished with the sensitive stuff */
 554         unbecome_user();
 555
 556         /* Add veto/hide lists */
 557         if (!IS_IPC(conn) && !IS_PRINT(conn)) {
 558                 set_namearray( &conn->veto_list, lp_veto_files(SNUM(conn)));
 559                 set_namearray( &conn->hide_list, lp_hide_files(SNUM(conn)));
 560                 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(SNUM(conn)));
 561         }
 562
 563         return(conn);
 564 }
 565
 566
 567 /****************************************************************************
 568 close a cnum
 569 ****************************************************************************/
 570 void close_cnum(connection_struct *conn, uint16 vuid)
 571 {
 572         DirCacheFlush(SNUM(conn));
 573
 574         unbecome_user();
 575
 576         DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
 577                                  remote_machine,conn->client_address,
 578                                  lp_servicename(SNUM(conn))));
 579
 580         yield_connection(conn,
 581                          lp_servicename(SNUM(conn)),
 582                          lp_max_connections(SNUM(conn)));
 583
 584         if (lp_status(SNUM(conn)))
 585                 yield_connection(conn,"STATUS.",MAXSTATUS);
 586
 587         file_close_conn(conn);
 588         dptr_closecnum(conn);
 589
 590         /* execute any "postexec = " line */
 591         if (*lp_postexec(SNUM(conn)) &&
 592             become_user(conn, vuid))  {
 593                 pstring cmd;
 594                 pstrcpy(cmd,lp_postexec(SNUM(conn)));
 595                 standard_sub(conn,cmd);
 596                 smbrun(cmd,NULL,False);
 597                 unbecome_user();
 598         }
 599
 600         unbecome_user();
 601         /* execute any "root postexec = " line */
 602         if (*lp_rootpostexec(SNUM(conn)))  {
 603                 pstring cmd;
 604                 pstrcpy(cmd,lp_rootpostexec(SNUM(conn)));
 605                 standard_sub(conn,cmd);
 606                 smbrun(cmd,NULL,False);
 607         }
 608
 609         conn_free(conn);
 610 }