source/smb_server/service.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    service (connection) handling
   4    Copyright (C) Andrew Tridgell 1992-2003
   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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23
  24 /****************************************************************************
  25  Add a home service. Returns the new service number or -1 if fail.
  26 ****************************************************************************/
  27 int add_home_service(const char *service, const char *username, const char *homedir)
  28 {
  29         int iHomeService;
  30
  31         if (!service || !homedir)
  32                 return -1;
  33
  34         if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0)
  35                 return -1;
  36
  37         /*
  38          * If this is a winbindd provided username, remove
  39          * the domain component before adding the service.
  40          * Log a warning if the "path=" parameter does not
  41          * include any macros.
  42          */
  43
  44         {
  45                 const char *p = strchr(service,*lp_winbind_separator());
  46
  47                 /* We only want the 'user' part of the string */
  48                 if (p) {
  49                         service = p + 1;
  50                 }
  51         }
  52
  53         if (!lp_add_home(service, iHomeService, username, homedir)) {
  54                 return -1;
  55         }
  56
  57         return lp_servicenumber(service);
  58
  59 }
  60
  61
  62 /**
  63  * Find a service entry. service is always in dos codepage.
  64  *
  65  * @param service is modified (to canonical form??)
  66  **/
  67 static int find_service(const char *service)
  68 {
  69         int iService;
  70
  71         iService = lp_servicenumber(service);
  72
  73         /* If we still don't have a service, attempt to add it as a printer. */
  74         if (iService == -1) {
  75                 int iPrinterService;
  76
  77                 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) >= 0) {
  78                         const char *pszTemp;
  79
  80                         DEBUG(3,("checking whether %s is a valid printer name...\n", service));
  81                         pszTemp = lp_printcapname();
  82                         if ((pszTemp != NULL) && pcap_printername_ok(service, pszTemp)) {
  83                                 DEBUG(3,("%s is a valid printer name\n", service));
  84                                 DEBUG(3,("adding %s as a printer service\n", service));
  85                                 lp_add_printer(service, iPrinterService);
  86                                 iService = lp_servicenumber(service);
  87                                 if (iService < 0)
  88                                         DEBUG(0,("failed to add %s as a printer service!\n", service));
  89                         } else {
  90                                 DEBUG(3,("%s is not a valid printer name\n", service));
  91                         }
  92                 }
  93         }
  94
  95         /* Check for default vfs service?  Unsure whether to implement this */
  96         if (iService == -1) {
  97         }
  98
  99         /* just possibly it's a default service? */
 100         if (iService == -1) {
 101                 char *pdefservice = lp_defaultservice();
 102                 if (pdefservice && *pdefservice &&
 103                     !strequal(pdefservice,service) &&
 104                     !strstr(service,"..")) {
 105                         /*
 106                          * We need to do a local copy here as lp_defaultservice()
 107                          * returns one of the rotating lp_string buffers that
 108                          * could get overwritten by the recursive find_service() call
 109                          * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
 110                          */
 111                         pstring defservice;
 112                         pstrcpy(defservice, pdefservice);
 113                         iService = find_service(defservice);
 114                         if (iService >= 0) {
 115                                 /* REWRITE: all_string_sub(service, "_","/",0); */
 116                                 iService = lp_add_service(service, iService);
 117                         }
 118                 }
 119         }
 120
 121         if (iService >= 0 && !VALID_SNUM(iService)) {
 122                 DEBUG(0,("Invalid snum %d for %s\n",iService, service));
 123                 iService = -1;
 124         }
 125
 126         if (iService == -1) {
 127                 DEBUG(3,("find_service() failed to find service %s\n", service));
 128         }
 129
 130         return iService;
 131 }
 132
 133
 134 /****************************************************************************
 135   Make a connection, given the snum to connect to, and the vuser of the
 136   connecting user if appropriate.
 137 ****************************************************************************/
 138 static NTSTATUS make_connection_snum(struct request_context *req,
 139                                      int snum, enum ntvfs_type type,
 140                                      DATA_BLOB password,
 141                                      const char *dev)
 142 {
 143         struct tcon_context *conn;
 144         NTSTATUS status;
 145
 146         conn = conn_new(req->smb_ctx);
 147         if (!conn) {
 148                 DEBUG(0,("Couldn't find free connection.\n"));
 149                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 150         }
 151         req->conn = conn;
 152
 153         conn->service = snum;
 154         conn->type = type;
 155
 156         /*
 157          * New code to check if there's a share security descripter
 158          * added from NT server manager. This is done after the
 159          * smb.conf checks are done as we need a uid and token. JRA.
 160          *
 161          */
 162
 163         if (!share_access_check(req, conn, snum, SA_RIGHT_FILE_WRITE_DATA)) {
 164                 if (!share_access_check(req, conn, snum, SA_RIGHT_FILE_READ_DATA)) {
 165                         /* No access, read or write. */
 166                         DEBUG(0,( "make_connection: connection to %s denied due to security descriptor.\n",
 167                                   lp_servicename(snum)));
 168                         conn_free(req->smb_ctx, conn);
 169                         return NT_STATUS_ACCESS_DENIED;
 170                 } else {
 171                         conn->read_only = True;
 172                 }
 173         }
 174
 175         /* check number of connections */
 176         if (!claim_connection(conn,
 177                               lp_servicename(SNUM(conn)),
 178                               lp_max_connections(SNUM(conn)),
 179                               False,0)) {
 180                 DEBUG(1,("too many connections - rejected\n"));
 181                 conn_free(req->smb_ctx, conn);
 182                 return NT_STATUS_INSUFFICIENT_RESOURCES;
 183         }
 184
 185         /* init ntvfs function pointers */
 186         status = ntvfs_init_connection(req);
 187         if (!NT_STATUS_IS_OK(status)) {
 188                 DEBUG(0, ("ntvfs_init_connection failed for service %s\n", lp_servicename(SNUM(conn))));
 189                 conn_free(req->smb_ctx, conn);
 190                 return status;
 191         }
 192
 193         /* Invoke NTVFS connection hook */
 194         if (conn->ntvfs_ops->connect) {
 195                 status = conn->ntvfs_ops->connect(req, lp_servicename(snum));
 196                 if (!NT_STATUS_IS_OK(status)) {
 197                         DEBUG(0,("make_connection: NTVFS make connection failed!\n"));
 198                         conn_free(req->smb_ctx, conn);
 199                         return status;
 200                 }
 201         }
 202
 203         return NT_STATUS_OK;
 204 }
 205
 206 /****************************************************************************
 207  Make a connection to a service.
 208  *
 209  * @param service
 210 ****************************************************************************/
 211 static NTSTATUS make_connection(struct request_context *req,
 212                                 const char *service, DATA_BLOB password,
 213                                 const char *dev, uint16_t vuid)
 214 {
 215         int snum;
 216         enum ntvfs_type type;
 217         const char *type_str;
 218
 219         /* the service might be of the form \\SERVER\SHARE. Should we put
 220            the server name we get from this somewhere? */
 221         if (strncmp(service, "\\\\", 2) == 0) {
 222                 char *p = strchr(service+2, '\\');
 223                 if (p) {
 224                         service = p + 1;
 225                 }
 226         }
 227
 228         snum = find_service(service);
 229
 230         if (snum == -1) {
 231                 DEBUG(0,("%s couldn't find service %s\n",
 232                          sub_get_remote_machine(), service));
 233                 return NT_STATUS_BAD_NETWORK_NAME;
 234         }
 235
 236         /* work out what sort of connection this is */
 237         if (strcmp(lp_fstype(snum), "IPC") == 0) {
 238                 type = NTVFS_IPC;
 239                 type_str = "IPC";
 240         } else if (lp_print_ok(snum)) {
 241                 type = NTVFS_PRINT;
 242                 type_str = "LPT:";
 243         } else {
 244                 type = NTVFS_DISK;
 245                 type_str = "A:";
 246         }
 247
 248         if (strcmp(dev, "?????") != 0 && strcasecmp(type_str, dev) != 0) {
 249                 /* the client gave us the wrong device type */
 250                 return NT_STATUS_BAD_DEVICE_TYPE;
 251         }
 252
 253         return make_connection_snum(req, snum, type, password, dev);
 254 }
 255
 256 /****************************************************************************
 257 close a cnum
 258 ****************************************************************************/
 259 void close_cnum(struct tcon_context *conn)
 260 {
 261         DEBUG(3,("%s closed connection to service %s\n",
 262                  conn->smb_ctx->socket.client_addr, lp_servicename(SNUM(conn))));
 263
 264         yield_connection(conn, lp_servicename(SNUM(conn)));
 265
 266         /* tell the ntvfs backend that we are disconnecting */
 267         conn->ntvfs_ops->disconnect(conn);
 268
 269         conn_free(conn->smb_ctx, conn);
 270 }
 271
 272
 273
 274 /*
 275   backend for tree connect call
 276 */
 277 NTSTATUS tcon_backend(struct request_context *req, union smb_tcon *con)
 278 {
 279         NTSTATUS status;
 280
 281         /* can only do bare tcon in share level security */
 282         if (req->user_ctx == NULL && lp_security() != SEC_SHARE) {
 283                 return NT_STATUS_ACCESS_DENIED;
 284         }
 285
 286         if (con->generic.level == RAW_TCON_TCON) {
 287                 DATA_BLOB password;
 288                 password = data_blob(con->tcon.in.password, strlen(con->tcon.in.password) + 1);
 289
 290                 status = make_connection(req, con->tcon.in.service, password, con->tcon.in.dev, req->user_ctx->vuid);
 291
 292                 if (!NT_STATUS_IS_OK(status)) {
 293                         return status;
 294                 }
 295
 296                 con->tcon.out.max_xmit = req->smb_ctx->negotiate.max_recv;
 297                 con->tcon.out.cnum = req->conn->cnum;
 298
 299                 return status;
 300         }
 301
 302         status = make_connection(req, con->tconx.in.path, con->tconx.in.password,
 303                                  con->tconx.in.device, req->user_ctx->vuid);
 304         if (!NT_STATUS_IS_OK(status)) {
 305                 return status;
 306         }
 307
 308         con->tconx.out.cnum = req->conn->cnum;
 309         con->tconx.out.dev_type = talloc_strdup(req->mem_ctx, req->conn->dev_type);
 310         con->tconx.out.fs_type = talloc_strdup(req->mem_ctx, req->conn->fs_type);
 311         con->tconx.out.options = SMB_SUPPORT_SEARCH_BITS | (lp_csc_policy(req->conn->service) << 2);
 312         if (lp_msdfs_root(req->conn->service) && lp_host_msdfs()) {
 313                 con->tconx.out.options |= SMB_SHARE_IN_DFS;
 314         }
 315
 316         return status;
 317 }