source3/param/service.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    service (connection) opening and closing
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "../lib/tsocket/tsocket.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../librpc/gen_ndr/netlogon.h"
  26 #include "../libcli/security/security.h"
  27 #include "printing/pcap.h"
  28 #include "passdb/lookup_sid.h"
  29 #include "auth.h"
  30 #include "lib/param/loadparm.h"
  31
  32 static int load_registry_service(const char *servicename)
  33 {
  34         if (!lp_registry_shares()) {
  35                 return -1;
  36         }
  37
  38         if ((servicename == NULL) || (*servicename == '\0')) {
  39                 return -1;
  40         }
  41
  42         if (strequal(servicename, GLOBAL_NAME)) {
  43                 return -2;
  44         }
  45
  46         if (!process_registry_service(servicename)) {
  47                 return -1;
  48         }
  49
  50         return lp_servicenumber(servicename);
  51 }
  52
  53 void load_registry_shares(void)
  54 {
  55         DEBUG(8, ("load_registry_shares()\n"));
  56         if (!lp_registry_shares()) {
  57                 return;
  58         }
  59
  60         process_registry_shares();
  61
  62         return;
  63 }
  64
  65 /****************************************************************************
  66  Add a home service. Returns the new service number or -1 if fail.
  67 ****************************************************************************/
  68
  69 int add_home_service(const char *service, const char *username, const char *homedir)
  70 {
  71         int iHomeService;
  72
  73         if (!service || !homedir || homedir[0] == '\0')
  74                 return -1;
  75
  76         if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
  77                 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
  78                         return -1;
  79                 }
  80         }
  81
  82         /*
  83          * If this is a winbindd provided username, remove
  84          * the domain component before adding the service.
  85          * Log a warning if the "path=" parameter does not
  86          * include any macros.
  87          */
  88
  89         {
  90                 const char *p = strchr(service,*lp_winbind_separator());
  91
  92                 /* We only want the 'user' part of the string */
  93                 if (p) {
  94                         service = p + 1;
  95                 }
  96         }
  97
  98         if (!lp_add_home(service, iHomeService, username, homedir)) {
  99                 return -1;
 100         }
 101
 102         return lp_servicenumber(service);
 103
 104 }
 105
 106 /**
 107  * Find a service entry.
 108  *
 109  * @param service is modified (to canonical form??)
 110  **/
 111
 112 int find_service(TALLOC_CTX *ctx, const char *service_in, char **p_service_out)
 113 {
 114         int iService;
 115
 116         if (!service_in) {
 117                 return -1;
 118         }
 119
 120         /* First make a copy. */
 121         *p_service_out = talloc_strdup(ctx, service_in);
 122         if (!*p_service_out) {
 123                 return -1;
 124         }
 125
 126         all_string_sub(*p_service_out,"\\","/",0);
 127
 128         iService = lp_servicenumber(*p_service_out);
 129
 130         /* now handle the special case of a home directory */
 131         if (iService < 0) {
 132                 char *phome_dir = get_user_home_dir(ctx, *p_service_out);
 133
 134                 if(!phome_dir) {
 135                         /*
 136                          * Try mapping the servicename, it may
 137                          * be a Windows to unix mapped user name.
 138                          */
 139                         if(map_username(ctx, *p_service_out, p_service_out)) {
 140                                 if (*p_service_out == NULL) {
 141                                         /* Out of memory. */
 142                                         return -1;
 143                                 }
 144                                 phome_dir = get_user_home_dir(
 145                                                 ctx, *p_service_out);
 146                         }
 147                 }
 148
 149                 DEBUG(3,("checking for home directory %s gave %s\n",*p_service_out,
 150                         phome_dir?phome_dir:"(NULL)"));
 151
 152                 iService = add_home_service(*p_service_out,*p_service_out /* 'username' */, phome_dir);
 153         }
 154
 155         /* If we still don't have a service, attempt to add it as a printer. */
 156         if (iService < 0) {
 157                 int iPrinterService;
 158
 159                 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
 160                         iPrinterService = load_registry_service(PRINTERS_NAME);
 161                 }
 162                 if (iPrinterService >= 0) {
 163                         DEBUG(3,("checking whether %s is a valid printer name...\n",
 164                                 *p_service_out));
 165                         if (pcap_printername_ok(*p_service_out)) {
 166                                 DEBUG(3,("%s is a valid printer name\n",
 167                                         *p_service_out));
 168                                 DEBUG(3,("adding %s as a printer service\n",
 169                                         *p_service_out));
 170                                 lp_add_printer(*p_service_out, iPrinterService);
 171                                 iService = lp_servicenumber(*p_service_out);
 172                                 if (iService < 0) {
 173                                         DEBUG(0,("failed to add %s as a printer service!\n",
 174                                                 *p_service_out));
 175                                 }
 176                         } else {
 177                                 DEBUG(3,("%s is not a valid printer name\n",
 178                                         *p_service_out));
 179                         }
 180                 }
 181         }
 182
 183         if (iService < 0) {
 184                 iService = load_registry_service(*p_service_out);
 185         }
 186
 187         /* Is it a usershare service ? */
 188         if (iService < 0 && *lp_usershare_path(talloc_tos())) {
 189                 /* Ensure the name is canonicalized. */
 190                 if (!strlower_m(*p_service_out)) {
 191                         goto fail;
 192                 }
 193                 iService = load_usershare_service(*p_service_out);
 194         }
 195
 196         /* just possibly it's a default service? */
 197         if (iService < 0) {
 198                 char *pdefservice = lp_defaultservice(talloc_tos());
 199                 if (pdefservice &&
 200                                 *pdefservice &&
 201                                 !strequal(pdefservice, *p_service_out)
 202                                 && !strstr_m(*p_service_out,"..")) {
 203                         /*
 204                          * We need to do a local copy here as lp_defaultservice()
 205                          * returns one of the rotating lp_string buffers that
 206                          * could get overwritten by the recursive find_service() call
 207                          * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
 208                          */
 209                         char *defservice = talloc_strdup(ctx, pdefservice);
 210
 211                         if (!defservice) {
 212                                 goto fail;
 213                         }
 214
 215                         /* Disallow anything except explicit share names. */
 216                         if (strequal(defservice,HOMES_NAME) ||
 217                                         strequal(defservice, PRINTERS_NAME) ||
 218                                         strequal(defservice, "IPC$")) {
 219                                 TALLOC_FREE(defservice);
 220                                 goto fail;
 221                         }
 222
 223                         iService = find_service(ctx, defservice, p_service_out);
 224                         if (!*p_service_out) {
 225                                 TALLOC_FREE(defservice);
 226                                 iService = -1;
 227                                 goto fail;
 228                         }
 229                         if (iService >= 0) {
 230                                 all_string_sub(*p_service_out, "_","/",0);
 231                                 iService = lp_add_service(*p_service_out, iService);
 232                         }
 233                         TALLOC_FREE(defservice);
 234                 }
 235         }
 236
 237         if (iService >= 0) {
 238                 if (!VALID_SNUM(iService)) {
 239                         DEBUG(0,("Invalid snum %d for %s\n",iService,
 240                                 *p_service_out));
 241                         iService = -1;
 242                 }
 243         }
 244
 245   fail:
 246
 247         if (iService < 0) {
 248                 DEBUG(3,("find_service() failed to find service %s\n",
 249                         *p_service_out));
 250         }
 251
 252         return (iService);
 253 }