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
  31 static int load_registry_service(const char *servicename)
  32 {
  33         if (!lp_registry_shares()) {
  34                 return -1;
  35         }
  36
  37         if ((servicename == NULL) || (*servicename == '\0')) {
  38                 return -1;
  39         }
  40
  41         if (strequal(servicename, GLOBAL_NAME)) {
  42                 return -2;
  43         }
  44
  45         if (!process_registry_service(servicename)) {
  46                 return -1;
  47         }
  48
  49         return lp_servicenumber(servicename);
  50 }
  51
  52 void load_registry_shares(void)
  53 {
  54         DEBUG(8, ("load_registry_shares()\n"));
  55         if (!lp_registry_shares()) {
  56                 return;
  57         }
  58
  59         process_registry_shares();
  60
  61         return;
  62 }
  63
  64 /****************************************************************************
  65  Add a home service. Returns the new service number or -1 if fail.
  66 ****************************************************************************/
  67
  68 int add_home_service(const char *service, const char *username, const char *homedir)
  69 {
  70         int iHomeService;
  71
  72         if (!service || !homedir || homedir[0] == '\0')
  73                 return -1;
  74
  75         if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
  76                 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
  77                         return -1;
  78                 }
  79         }
  80
  81         /*
  82          * If this is a winbindd provided username, remove
  83          * the domain component before adding the service.
  84          * Log a warning if the "path=" parameter does not
  85          * include any macros.
  86          */
  87
  88         {
  89                 const char *p = strchr(service,*lp_winbind_separator());
  90
  91                 /* We only want the 'user' part of the string */
  92                 if (p) {
  93                         service = p + 1;
  94                 }
  95         }
  96
  97         if (!lp_add_home(service, iHomeService, username, homedir)) {
  98                 return -1;
  99         }
 100
 101         return lp_servicenumber(service);
 102
 103 }
 104
 105 /**
 106  * Find a service entry.
 107  *
 108  * @param service is modified (to canonical form??)
 109  **/
 110
 111 int find_service(TALLOC_CTX *ctx, const char *service_in, char **p_service_out)
 112 {
 113         int iService;
 114
 115         if (!service_in) {
 116                 return -1;
 117         }
 118
 119         /* First make a copy. */
 120         *p_service_out = talloc_strdup(ctx, service_in);
 121         if (!*p_service_out) {
 122                 return -1;
 123         }
 124
 125         all_string_sub(*p_service_out,"\\","/",0);
 126
 127         iService = lp_servicenumber(*p_service_out);
 128
 129         /* now handle the special case of a home directory */
 130         if (iService < 0) {
 131                 char *phome_dir = get_user_home_dir(ctx, *p_service_out);
 132
 133                 if(!phome_dir) {
 134                         /*
 135                          * Try mapping the servicename, it may
 136                          * be a Windows to unix mapped user name.
 137                          */
 138                         if(map_username(ctx, *p_service_out, p_service_out)) {
 139                                 if (*p_service_out == NULL) {
 140                                         /* Out of memory. */
 141                                         return -1;
 142                                 }
 143                                 phome_dir = get_user_home_dir(
 144                                                 ctx, *p_service_out);
 145                         }
 146                 }
 147
 148                 DEBUG(3,("checking for home directory %s gave %s\n",*p_service_out,
 149                         phome_dir?phome_dir:"(NULL)"));
 150
 151                 iService = add_home_service(*p_service_out,*p_service_out /* 'username' */, phome_dir);
 152         }
 153
 154         /* If we still don't have a service, attempt to add it as a printer. */
 155         if (iService < 0) {
 156                 int iPrinterService;
 157
 158                 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
 159                         iPrinterService = load_registry_service(PRINTERS_NAME);
 160                 }
 161                 if (iPrinterService >= 0) {
 162                         DEBUG(3,("checking whether %s is a valid printer name...\n",
 163                                 *p_service_out));
 164                         if (pcap_printername_ok(*p_service_out)) {
 165                                 DEBUG(3,("%s is a valid printer name\n",
 166                                         *p_service_out));
 167                                 DEBUG(3,("adding %s as a printer service\n",
 168                                         *p_service_out));
 169                                 lp_add_printer(*p_service_out, iPrinterService);
 170                                 iService = lp_servicenumber(*p_service_out);
 171                                 if (iService < 0) {
 172                                         DEBUG(0,("failed to add %s as a printer service!\n",
 173                                                 *p_service_out));
 174                                 }
 175                         } else {
 176                                 DEBUG(3,("%s is not a valid printer name\n",
 177                                         *p_service_out));
 178                         }
 179                 }
 180         }
 181
 182         /* Check for default vfs service?  Unsure whether to implement this */
 183         if (iService < 0) {
 184         }
 185
 186         if (iService < 0) {
 187                 iService = load_registry_service(*p_service_out);
 188         }
 189
 190         /* Is it a usershare service ? */
 191         if (iService < 0 && *lp_usershare_path()) {
 192                 /* Ensure the name is canonicalized. */
 193                 strlower_m(*p_service_out);
 194                 iService = load_usershare_service(*p_service_out);
 195         }
 196
 197         /* just possibly it's a default service? */
 198         if (iService < 0) {
 199                 char *pdefservice = lp_defaultservice();
 200                 if (pdefservice &&
 201                                 *pdefservice &&
 202                                 !strequal(pdefservice, *p_service_out)
 203                                 && !strstr_m(*p_service_out,"..")) {
 204                         /*
 205                          * We need to do a local copy here as lp_defaultservice()
 206                          * returns one of the rotating lp_string buffers that
 207                          * could get overwritten by the recursive find_service() call
 208                          * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
 209                          */
 210                         char *defservice = talloc_strdup(ctx, pdefservice);
 211
 212                         if (!defservice) {
 213                                 goto fail;
 214                         }
 215
 216                         /* Disallow anything except explicit share names. */
 217                         if (strequal(defservice,HOMES_NAME) ||
 218                                         strequal(defservice, PRINTERS_NAME) ||
 219                                         strequal(defservice, "IPC$")) {
 220                                 TALLOC_FREE(defservice);
 221                                 goto fail;
 222                         }
 223
 224                         iService = find_service(ctx, defservice, p_service_out);
 225                         if (!*p_service_out) {
 226                                 TALLOC_FREE(defservice);
 227                                 iService = -1;
 228                                 goto fail;
 229                         }
 230                         if (iService >= 0) {
 231                                 all_string_sub(*p_service_out, "_","/",0);
 232                                 iService = lp_add_service(*p_service_out, iService);
 233                         }
 234                         TALLOC_FREE(defservice);
 235                 }
 236         }
 237
 238         if (iService >= 0) {
 239                 if (!VALID_SNUM(iService)) {
 240                         DEBUG(0,("Invalid snum %d for %s\n",iService,
 241                                 *p_service_out));
 242                         iService = -1;
 243                 }
 244         }
 245
 246   fail:
 247
 248         if (iService < 0) {
 249                 DEBUG(3,("find_service() failed to find service %s\n",
 250                         *p_service_out));
 251         }
 252
 253         return (iService);
 254 }
 255
 256
 257 struct share_params *get_share_params(TALLOC_CTX *mem_ctx,
 258                                       const char *sharename)
 259 {
 260         struct share_params *result;
 261         char *sname = NULL;
 262         int snum;
 263
 264         snum = find_service(mem_ctx, sharename, &sname);
 265         if (snum < 0 || sname == NULL) {
 266                 return NULL;
 267         }
 268
 269         if (!(result = talloc(mem_ctx, struct share_params))) {
 270                 DEBUG(0, ("talloc failed\n"));
 271                 return NULL;
 272         }
 273
 274         result->service = snum;
 275         return result;
 276 }