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    string_sub(service,"\\","/");
  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_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_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          string_sub(service,"_","/");
 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
 196         strlower(service);
 197
 198         snum = find_service(service);
 199         if (snum < 0) {
 200                 extern int Client;
 201                 if (strequal(service,"IPC$")) {
 202                         DEBUG(3,("refusing IPC connection\n"));
 203                         *ecode = ERRnoipc;
 204                         return NULL;
 205                 }
 206
 207                 DEBUG(0,("%s (%s) couldn't find service %s\n",
 208                          remote_machine, client_addr(Client), service));
 209                 *ecode = ERRinvnetname;
 210                 return NULL;
 211         }
 212
 213         if (strequal(service,HOMES_NAME)) {
 214                 if (*user && Get_Pwnam(user,True))
 215                         return(make_connection(user,user,password,
 216                                                pwlen,dev,vuid,ecode));
 217
 218                 if(lp_security() != SEC_SHARE) {
 219                         if (validated_username(vuid)) {
 220                                 pstrcpy(user,validated_username(vuid));
 221                                 return(make_connection(user,user,password,pwlen,dev,vuid,ecode));
 222                         }
 223                 } else {
 224                         /* Security = share. Try with sesssetup_user
 225                          * as the username.  */
 226                         if(*sesssetup_user) {
 227                                 pstrcpy(user,sesssetup_user);
 228                                 return(make_connection(user,user,password,pwlen,dev,vuid,ecode));
 229                         }
 230                 }
 231         }
 232
 233         if (!lp_snum_ok(snum) ||
 234             !check_access(Client,
 235                           lp_hostsallow(snum), lp_hostsdeny(snum))) {
 236                 *ecode = ERRaccess;
 237                 return NULL;
 238         }
 239
 240         /* you can only connect to the IPC$ service as an ipc device */
 241         if (strequal(service,"IPC$"))
 242                 pstrcpy(dev,"IPC");
 243
 244         if (*dev == '?' || !*dev) {
 245                 if (lp_print_ok(snum)) {
 246                         pstrcpy(dev,"LPT1:");
 247                 } else {
 248                         pstrcpy(dev,"A:");
 249                 }
 250         }
 251
 252         /* if the request is as a printer and you can't print then refuse */
 253         strupper(dev);
 254         if (!lp_print_ok(snum) && (strncmp(dev,"LPT",3) == 0)) {
 255                 DEBUG(1,("Attempt to connect to non-printer as a printer\n"));
 256                 *ecode = ERRinvdevice;
 257                 return NULL;
 258         }
 259
 260         /* lowercase the user name */
 261         strlower(user);
 262
 263         /* add it as a possible user name */
 264         add_session_user(service);
 265
 266         /* shall we let them in? */
 267         if (!authorise_login(snum,user,password,pwlen,&guest,&force,vuid)) {
 268                 DEBUG( 2, ( "Invalid username/password for %s\n", service ) );
 269                 *ecode = ERRbadpw;
 270                 return NULL;
 271         }
 272
 273         conn = conn_new();
 274         if (!conn) {
 275                 DEBUG(0,("Couldn't find free connection.\n"));
 276                 *ecode = ERRnoresource;
 277                 conn_free(conn);
 278                 return NULL;
 279         }
 280
 281         /* find out some info about the user */
 282         pass = Get_Pwnam(user,True);
 283
 284         if (pass == NULL) {
 285                 DEBUG(0,( "Couldn't find account %s\n",user));
 286                 *ecode = ERRbaduid;
 287                 conn_free(conn);
 288                 return NULL;
 289         }
 290
 291         conn->read_only = lp_readonly(snum);
 292
 293         {
 294                 pstring list;
 295                 StrnCpy(list,lp_readlist(snum),sizeof(pstring)-1);
 296                 string_sub(list,"%S",service);
 297
 298                 if (user_in_list(user,list))
 299                         conn->read_only = True;
 300
 301                 StrnCpy(list,lp_writelist(snum),sizeof(pstring)-1);
 302                 string_sub(list,"%S",service);
 303
 304                 if (user_in_list(user,list))
 305                         conn->read_only = False;
 306         }
 307
 308         /* admin user check */
 309
 310         /* JRA - original code denied admin user if the share was
 311            marked read_only. Changed as I don't think this is needed,
 312            but old code left in case there is a problem here.
 313         */
 314         if (user_in_list(user,lp_admin_users(snum))
 315 #if 0
 316             && !conn->read_only
 317 #endif
 318             ) {
 319                 conn->admin_user = True;
 320                 DEBUG(0,("%s logged in as admin user (root privileges)\n",user));
 321         } else {
 322                 conn->admin_user = False;
 323         }
 324
 325         conn->force_user = force;
 326         conn->vuid = vuid;
 327         conn->uid = pass->pw_uid;
 328         conn->gid = pass->pw_gid;
 329         conn->num_files_open = 0;
 330         conn->lastused = time(NULL);
 331         conn->service = snum;
 332         conn->used = True;
 333         conn->printer = (strncmp(dev,"LPT",3) == 0);
 334         conn->ipc = (strncmp(dev,"IPC",3) == 0);
 335         conn->dirptr = NULL;
 336         conn->veto_list = NULL;
 337         conn->hide_list = NULL;
 338         conn->veto_oplock_list = NULL;
 339         string_set(&conn->dirpath,"");
 340         string_set(&conn->user,user);
 341
 342 #ifdef HAVE_GETGRNAM
 343         if (*lp_force_group(snum)) {
 344                 struct group *gptr;
 345                 pstring gname;
 346
 347                 StrnCpy(gname,lp_force_group(snum),sizeof(pstring)-1);
 348                 /* default service may be a group name          */
 349                 string_sub(gname,"%S",service);
 350                 gptr = (struct group *)getgrnam(gname);
 351
 352                 if (gptr) {
 353                         conn->gid = gptr->gr_gid;
 354                         DEBUG(3,("Forced group %s\n",gname));
 355                 } else {
 356                         DEBUG(1,("Couldn't find group %s\n",gname));
 357                 }
 358         }
 359 #endif
 360
 361         if (*lp_force_user(snum)) {
 362                 struct passwd *pass2;
 363                 pstring fuser;
 364                 pstrcpy(fuser,lp_force_user(snum));
 365
 366                 /* Allow %S to be used by force user. */
 367                 string_sub(fuser,"%S",service);
 368
 369                 pass2 = (struct passwd *)Get_Pwnam(fuser,True);
 370                 if (pass2) {
 371                         conn->uid = pass2->pw_uid;
 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         {
 382                 pstring s;
 383                 pstrcpy(s,lp_pathname(snum));
 384                 standard_sub(conn,s);
 385                 string_set(&conn->connectpath,s);
 386                 DEBUG(3,("Connect path is %s\n",s));
 387         }
 388
 389         /* groups stuff added by ih */
 390         conn->ngroups = 0;
 391         conn->groups = NULL;
 392
 393         if (!IS_IPC(conn)) {
 394                 /* Find all the groups this uid is in and
 395                    store them. Used by become_user() */
 396                 setup_groups(conn->user,conn->uid,conn->gid,
 397                              &conn->ngroups,&conn->groups);
 398
 399                 /* check number of connections */
 400                 if (!claim_connection(conn,
 401                                       lp_servicename(SNUM(conn)),
 402                                       lp_max_connections(SNUM(conn)),
 403                                       False)) {
 404                         DEBUG(1,("too many connections - rejected\n"));
 405                         *ecode = ERRnoresource;
 406                         conn_free(conn);
 407                         return NULL;
 408                 }
 409
 410                 if (lp_status(SNUM(conn)))
 411                         claim_connection(conn,"STATUS.",
 412                                          MAXSTATUS,False);
 413         } /* IS_IPC */
 414
 415         /* execute any "root preexec = " line */
 416         if (*lp_rootpreexec(SNUM(conn))) {
 417                 pstring cmd;
 418                 pstrcpy(cmd,lp_rootpreexec(SNUM(conn)));
 419                 standard_sub(conn,cmd);
 420                 DEBUG(5,("cmd=%s\n",cmd));
 421                 smbrun(cmd,NULL,False);
 422         }
 423
 424         if (!become_user(conn, conn->vuid)) {
 425                 DEBUG(0,("Can't become connected user!\n"));
 426                 if (!IS_IPC(conn)) {
 427                         yield_connection(conn,
 428                                          lp_servicename(SNUM(conn)),
 429                                          lp_max_connections(SNUM(conn)));
 430                         if (lp_status(SNUM(conn))) {
 431                                 yield_connection(conn,"STATUS.",MAXSTATUS);
 432                         }
 433                 }
 434                 conn_free(conn);
 435                 *ecode = ERRbadpw;
 436                 return NULL;
 437         }
 438
 439         if (dos_ChDir(conn->connectpath) != 0) {
 440                 DEBUG(0,("Can't change directory to %s (%s)\n",
 441                          conn->connectpath,strerror(errno)));
 442                 unbecome_user();
 443                 if (!IS_IPC(conn)) {
 444                         yield_connection(conn,
 445                                          lp_servicename(SNUM(conn)),
 446                                          lp_max_connections(SNUM(conn)));
 447                         if (lp_status(SNUM(conn)))
 448                                 yield_connection(conn,"STATUS.",MAXSTATUS);
 449                 }
 450                 conn_free(conn);
 451                 *ecode = ERRinvnetname;
 452                 return NULL;
 453         }
 454
 455         string_set(&conn->origpath,conn->connectpath);
 456
 457 #if SOFTLINK_OPTIMISATION
 458         /* resolve any soft links early */
 459         {
 460                 pstring s;
 461                 pstrcpy(s,conn->connectpath);
 462                 dos_GetWd(s);
 463                 string_set(&conn->connectpath,s);
 464                 dos_ChDir(conn->connectpath);
 465         }
 466 #endif
 467
 468         add_session_user(user);
 469
 470         /* execute any "preexec = " line */
 471         if (*lp_preexec(SNUM(conn))) {
 472                 pstring cmd;
 473                 pstrcpy(cmd,lp_preexec(SNUM(conn)));
 474                 standard_sub(conn,cmd);
 475                 smbrun(cmd,NULL,False);
 476         }
 477
 478         /* we've finished with the sensitive stuff */
 479         unbecome_user();
 480
 481         /* Add veto/hide lists */
 482         if (!IS_IPC(conn) && !IS_PRINT(conn)) {
 483                 set_namearray( &conn->veto_list, lp_veto_files(SNUM(conn)));
 484                 set_namearray( &conn->hide_list, lp_hide_files(SNUM(conn)));
 485                 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(SNUM(conn)));
 486         }
 487
 488         if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
 489                 extern int Client;
 490
 491                 dbgtext( "%s (%s) ", remote_machine, client_addr(Client) );
 492                 dbgtext( "connect to service %s ", lp_servicename(SNUM(conn)) );
 493                 dbgtext( "as user %s ", user );
 494                 dbgtext( "(uid=%d, gid=%d) ", (int)conn->uid, (int)conn->gid );
 495                 dbgtext( "(pid %d)\n", (int)getpid() );
 496         }
 497
 498         return(conn);
 499 }
 500
 501
 502 /****************************************************************************
 503 close a cnum
 504 ****************************************************************************/
 505 void close_cnum(connection_struct *conn, uint16 vuid)
 506 {
 507         extern int Client;
 508         DirCacheFlush(SNUM(conn));
 509
 510         unbecome_user();
 511
 512         DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
 513                                  remote_machine,client_addr(Client),
 514                                  lp_servicename(SNUM(conn))));
 515
 516         yield_connection(conn,
 517                          lp_servicename(SNUM(conn)),
 518                          lp_max_connections(SNUM(conn)));
 519
 520         if (lp_status(SNUM(conn)))
 521                 yield_connection(conn,"STATUS.",MAXSTATUS);
 522
 523         file_close_conn(conn);
 524         dptr_closecnum(conn);
 525
 526         /* execute any "postexec = " line */
 527         if (*lp_postexec(SNUM(conn)) &&
 528             become_user(conn, vuid))  {
 529                 pstring cmd;
 530                 pstrcpy(cmd,lp_postexec(SNUM(conn)));
 531                 standard_sub(conn,cmd);
 532                 smbrun(cmd,NULL,False);
 533                 unbecome_user();
 534         }
 535
 536         unbecome_user();
 537         /* execute any "root postexec = " line */
 538         if (*lp_rootpostexec(SNUM(conn)))  {
 539                 pstring cmd;
 540                 pstrcpy(cmd,lp_rootpostexec(SNUM(conn)));
 541                 standard_sub(conn,cmd);
 542                 smbrun(cmd,NULL,False);
 543         }
 544
 545         conn_free(conn);
 546 }
 547
 548