b4a1115867d76ef6216c14d16bc5067b8fe1dd14
[samba.git] / source3 / 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 time_t 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;
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 && !strequal(pdefservice,service))
150      {
151        /*
152         * We need to do a local copy here as lp_defaultservice() 
153         * returns one of the rotating lp_string buffers that
154         * could get overwritten by the recursive find_service() call
155         * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
156         */
157        pstring defservice;
158        pstrcpy(defservice, pdefservice);
159        iService = find_service(defservice);
160        if (iService >= 0)
161        {
162          string_sub(service,"_","/");
163          iService = lp_add_service(service,iService);
164        }
165      }
166    }
167
168    if (iService >= 0)
169      if (!VALID_SNUM(iService))
170      {
171        DEBUG(0,("Invalid snum %d for %s\n",iService,service));
172        iService = -1;
173      }
174
175    if (iService < 0)
176      DEBUG(3,("find_service() failed to find service %s\n", service));
177
178    return (iService);
179 }
180
181
182 /****************************************************************************
183   make a connection to a service
184 ****************************************************************************/
185 connection_struct *make_connection(char *service,char *user,char *password, int pwlen, char *dev,uint16 vuid, int *ecode)
186 {
187         int snum;
188         struct passwd *pass = NULL;
189         BOOL guest = False;
190         BOOL force = False;
191         extern int Client;
192         connection_struct *conn;
193
194         strlower(service);
195
196         snum = find_service(service);
197         if (snum < 0) {
198                 extern int Client;
199                 if (strequal(service,"IPC$")) {
200                         DEBUG(3,("refusing IPC connection\n"));
201                         *ecode = ERRnoipc;
202                         return NULL;
203                 }
204
205                 DEBUG(0,("%s (%s) couldn't find service %s\n",
206                          remote_machine, client_addr(Client), service));
207                 *ecode = ERRinvnetname;
208                 return NULL;
209         }
210
211         if (strequal(service,HOMES_NAME)) {
212                 if (*user && Get_Pwnam(user,True))
213                         return(make_connection(user,user,password,
214                                                pwlen,dev,vuid,ecode));
215
216                 if(lp_security() != SEC_SHARE) {
217                         if (validated_username(vuid)) {
218                                 pstrcpy(user,validated_username(vuid));
219                                 return(make_connection(user,user,password,pwlen,dev,vuid,ecode));
220                         }
221                 } else {
222                         /* Security = share. Try with sesssetup_user
223                          * as the username.  */
224                         if(*sesssetup_user) {
225                                 pstrcpy(user,sesssetup_user);
226                                 return(make_connection(user,user,password,pwlen,dev,vuid,ecode));
227                         }
228                 }
229         }
230
231         if (!lp_snum_ok(snum) || 
232             !check_access(Client, 
233                           lp_hostsallow(snum), lp_hostsdeny(snum))) {    
234                 *ecode = ERRaccess;
235                 return NULL;
236         }
237
238         /* you can only connect to the IPC$ service as an ipc device */
239         if (strequal(service,"IPC$"))
240                 pstrcpy(dev,"IPC");
241         
242         if (*dev == '?' || !*dev) {
243                 if (lp_print_ok(snum)) {
244                         pstrcpy(dev,"LPT1:");
245                 } else {
246                         pstrcpy(dev,"A:");
247                 }
248         }
249
250         /* if the request is as a printer and you can't print then refuse */
251         strupper(dev);
252         if (!lp_print_ok(snum) && (strncmp(dev,"LPT",3) == 0)) {
253                 DEBUG(1,("Attempt to connect to non-printer as a printer\n"));
254                 *ecode = ERRinvdevice;
255                 return NULL;
256         }
257
258         /* lowercase the user name */
259         strlower(user);
260
261         /* add it as a possible user name */
262         add_session_user(service);
263
264         /* shall we let them in? */
265         if (!authorise_login(snum,user,password,pwlen,&guest,&force,vuid)) {
266                 DEBUG( 2, ( "Invalid username/password for %s\n", service ) );
267                 *ecode = ERRbadpw;
268                 return NULL;
269         }
270   
271         conn = conn_new();
272         if (!conn) {
273                 DEBUG(0,("Couldn't find free connection.\n"));
274                 *ecode = ERRnoresource;
275                 conn_free(conn);
276                 return NULL;
277         }
278
279         /* find out some info about the user */
280         pass = Get_Pwnam(user,True);
281
282         if (pass == NULL) {
283                 DEBUG(0,( "Couldn't find account %s\n",user));
284                 *ecode = ERRbaduid;
285                 conn_free(conn);
286                 return NULL;
287         }
288
289         conn->read_only = lp_readonly(snum);
290
291         {
292                 pstring list;
293                 StrnCpy(list,lp_readlist(snum),sizeof(pstring)-1);
294                 string_sub(list,"%S",service);
295
296                 if (user_in_list(user,list))
297                         conn->read_only = True;
298                 
299                 StrnCpy(list,lp_writelist(snum),sizeof(pstring)-1);
300                 string_sub(list,"%S",service);
301                 
302                 if (user_in_list(user,list))
303                         conn->read_only = False;    
304         }
305
306         /* admin user check */
307         
308         /* JRA - original code denied admin user if the share was
309            marked read_only. Changed as I don't think this is needed,
310            but old code left in case there is a problem here.
311         */
312         if (user_in_list(user,lp_admin_users(snum)) 
313 #if 0
314             && !conn->read_only
315 #endif
316             ) {
317                 conn->admin_user = True;
318                 DEBUG(0,("%s logged in as admin user (root privileges)\n",user));
319         } else {
320                 conn->admin_user = False;
321         }
322     
323         conn->force_user = force;
324         conn->vuid = vuid;
325         conn->uid = pass->pw_uid;
326         conn->gid = pass->pw_gid;
327         conn->num_files_open = 0;
328         conn->lastused = time(NULL);
329         conn->service = snum;
330         conn->used = True;
331         conn->printer = (strncmp(dev,"LPT",3) == 0);
332         conn->ipc = (strncmp(dev,"IPC",3) == 0);
333         conn->dirptr = NULL;
334         conn->veto_list = NULL;
335         conn->hide_list = NULL;
336         conn->veto_oplock_list = NULL;
337         string_set(&conn->dirpath,"");
338         string_set(&conn->user,user);
339         
340 #ifdef HAVE_GETGRNAM 
341         if (*lp_force_group(snum)) {
342                 struct group *gptr;
343                 pstring gname;
344                 
345                 StrnCpy(gname,lp_force_group(snum),sizeof(pstring)-1);
346                 /* default service may be a group name          */
347                 string_sub(gname,"%S",service);
348                 gptr = (struct group *)getgrnam(gname);
349                 
350                 if (gptr) {
351                         conn->gid = gptr->gr_gid;
352                         DEBUG(3,("Forced group %s\n",gname));
353                 } else {
354                         DEBUG(1,("Couldn't find group %s\n",gname));
355                 }
356         }
357 #endif
358         
359         if (*lp_force_user(snum)) {
360                 struct passwd *pass2;
361                 fstring fuser;
362                 fstrcpy(fuser,lp_force_user(snum));
363                 pass2 = (struct passwd *)Get_Pwnam(fuser,True);
364                 if (pass2) {
365                         conn->uid = pass2->pw_uid;
366                         string_set(&conn->user,fuser);
367                         fstrcpy(user,fuser);
368                         conn->force_user = True;
369                         DEBUG(3,("Forced user %s\n",fuser));      
370                 } else {
371                         DEBUG(1,("Couldn't find user %s\n",fuser));
372                 }
373         }
374
375         {
376                 pstring s;
377                 pstrcpy(s,lp_pathname(snum));
378                 standard_sub(conn,s);
379                 string_set(&conn->connectpath,s);
380                 DEBUG(3,("Connect path is %s\n",s));
381         }
382
383         /* groups stuff added by ih */
384         conn->ngroups = 0;
385         conn->groups = NULL;
386         
387         if (!IS_IPC(conn)) {
388                 /* Find all the groups this uid is in and
389                    store them. Used by become_user() */
390                 get_unixgroups(conn->user,conn->uid,conn->gid,
391                              &conn->ngroups,&conn->groups);
392                 
393                 /* check number of connections */
394                 if (!claim_connection(conn,
395                                       lp_servicename(SNUM(conn)),
396                                       lp_max_connections(SNUM(conn)),
397                                       False)) {
398                         DEBUG(1,("too many connections - rejected\n"));
399                         *ecode = ERRnoresource;
400                         conn_free(conn);
401                         return NULL;
402                 }  
403                 
404                 if (lp_status(SNUM(conn)))
405                         claim_connection(conn,"STATUS.",
406                                          MAXSTATUS,False);
407         } /* IS_IPC */
408         
409         /* execute any "root preexec = " line */
410         if (*lp_rootpreexec(SNUM(conn))) {
411                 pstring cmd;
412                 pstrcpy(cmd,lp_rootpreexec(SNUM(conn)));
413                 standard_sub(conn,cmd);
414                 DEBUG(5,("cmd=%s\n",cmd));
415                 smbrun(cmd,NULL,False);
416         }
417         
418         if (!become_user(conn, conn->vuid)) {
419                 DEBUG(0,("Can't become connected user!\n"));
420                 if (!IS_IPC(conn)) {
421                         yield_connection(conn,
422                                          lp_servicename(SNUM(conn)),
423                                          lp_max_connections(SNUM(conn)));
424                         if (lp_status(SNUM(conn))) {
425                                 yield_connection(conn,"STATUS.",MAXSTATUS);
426                         }
427                 }
428                 conn_free(conn);
429                 *ecode = ERRbadpw;
430                 return NULL;
431         }
432         
433         if (dos_ChDir(conn->connectpath) != 0) {
434                 DEBUG(0,("Can't change directory to %s (%s)\n",
435                          conn->connectpath,strerror(errno)));
436                 unbecome_user();
437                 if (!IS_IPC(conn)) {
438                         yield_connection(conn,
439                                          lp_servicename(SNUM(conn)),
440                                          lp_max_connections(SNUM(conn)));
441                         if (lp_status(SNUM(conn))) 
442                                 yield_connection(conn,"STATUS.",MAXSTATUS);
443                 }
444                 conn_free(conn);
445                 *ecode = ERRinvnetname;
446                 return NULL;
447         }
448         
449         string_set(&conn->origpath,conn->connectpath);
450         
451 #if SOFTLINK_OPTIMISATION
452         /* resolve any soft links early */
453         {
454                 pstring s;
455                 pstrcpy(s,conn->connectpath);
456                 dos_GetWd(s);
457                 string_set(&conn->connectpath,s);
458                 dos_ChDir(conn->connectpath);
459         }
460 #endif
461         
462         add_session_user(user);
463                 
464         /* execute any "preexec = " line */
465         if (*lp_preexec(SNUM(conn))) {
466                 pstring cmd;
467                 pstrcpy(cmd,lp_preexec(SNUM(conn)));
468                 standard_sub(conn,cmd);
469                 smbrun(cmd,NULL,False);
470         }
471         
472         /* we've finished with the sensitive stuff */
473         unbecome_user();
474         
475         /* Add veto/hide lists */
476         if (!IS_IPC(conn) && !IS_PRINT(conn)) {
477                 set_namearray( &conn->veto_list, lp_veto_files(SNUM(conn)));
478                 set_namearray( &conn->hide_list, lp_hide_files(SNUM(conn)));
479                 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(SNUM(conn)));
480         }
481         
482         if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
483                 extern int Client;
484                 
485                 dbgtext( "%s (%s) ", remote_machine, client_addr(Client) );
486                 dbgtext( "connect to service %s ", lp_servicename(SNUM(conn)) );
487                 dbgtext( "as user %s ", user );
488                 dbgtext( "(uid=%d, gid=%d) ", (int)conn->uid, (int)conn->gid );
489                 dbgtext( "(pid %d)\n", (int)getpid() );
490         }
491         
492         return(conn);
493 }
494
495
496 /****************************************************************************
497 close a cnum
498 ****************************************************************************/
499 void close_cnum(connection_struct *conn, uint16 vuid)
500 {
501         extern int Client;
502         DirCacheFlush(SNUM(conn));
503
504         unbecome_user();
505
506         DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
507                                  remote_machine,client_addr(Client),
508                                  lp_servicename(SNUM(conn))));
509
510         yield_connection(conn,
511                          lp_servicename(SNUM(conn)),
512                          lp_max_connections(SNUM(conn)));
513
514         if (lp_status(SNUM(conn)))
515                 yield_connection(conn,"STATUS.",MAXSTATUS);
516
517         file_close_conn(conn);
518         dptr_closecnum(conn);
519
520         /* execute any "postexec = " line */
521         if (*lp_postexec(SNUM(conn)) && 
522             become_user(conn, vuid))  {
523                 pstring cmd;
524                 pstrcpy(cmd,lp_postexec(SNUM(conn)));
525                 standard_sub(conn,cmd);
526                 smbrun(cmd,NULL,False);
527                 unbecome_user();
528         }
529
530         unbecome_user();
531         /* execute any "root postexec = " line */
532         if (*lp_rootpostexec(SNUM(conn)))  {
533                 pstring cmd;
534                 pstrcpy(cmd,lp_rootpostexec(SNUM(conn)));
535                 standard_sub(conn,cmd);
536                 smbrun(cmd,NULL,False);
537         }
538         
539         conn_free(conn);
540 }
541
542