[GLUE] Rsync SAMBA_3_2_0 SVN r25598 in order to create the v3-2-test branch.
[samba.git] / source / smbd / service.c
index ff6f9d1c1a68d95d9c04306db0dd05f5a7531bac..1c46e3776c28442e94b6fc77770d61c314d4c86f 100644 (file)
@@ -5,7 +5,7 @@
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "includes.h"
 
 extern userdom_struct current_user_info;
 
-BOOL canonicalize_path(connection_struct *conn, pstring path)
+static BOOL canonicalize_path(connection_struct *conn, pstring path)
 {
 #ifdef REALPATH_TAKES_NULL
        char *resolved_name = SMB_VFS_REALPATH(conn,path,NULL);
@@ -53,7 +52,7 @@ BOOL canonicalize_path(connection_struct *conn, pstring path)
  Observent people will notice a similarity between this and check_path_syntax :-).
 ****************************************************************************/
 
-void set_conn_connectpath(connection_struct *conn, const pstring connectpath)
+void set_conn_connectpath(connection_struct *conn, const char *connectpath)
 {
        pstring destname;
        char *d = destname;
@@ -313,6 +312,7 @@ static int load_registry_service(const char *servicename)
                TALLOC_FREE(value);
        }
 
+       res = 0;
  error:
 
        TALLOC_FREE(key);
@@ -402,6 +402,17 @@ int find_service(fstring service)
        if (iService < 0) {
        }
 
+       if (iService < 0) {
+               iService = load_registry_service(service);
+       }
+
+       /* Is it a usershare service ? */
+       if (iService < 0 && *lp_usershare_path()) {
+               /* Ensure the name is canonicalized. */
+               strlower_m(service);
+               iService = load_usershare_service(service);
+       }
+
        /* just possibly it's a default service? */
        if (iService < 0) {
                char *pdefservice = lp_defaultservice();
@@ -414,6 +425,14 @@ int find_service(fstring service)
                         */
                        pstring defservice;
                        pstrcpy(defservice, pdefservice);
+
+                       /* Disallow anything except explicit share names. */
+                       if (strequal(defservice,HOMES_NAME) ||
+                                       strequal(defservice, PRINTERS_NAME) ||
+                                       strequal(defservice, "IPC$")) {
+                               goto fail;
+                       }
+
                        iService = find_service(defservice);
                        if (iService >= 0) {
                                all_string_sub(service, "_","/",0);
@@ -422,17 +441,6 @@ int find_service(fstring service)
                }
        }
 
-       if (iService < 0) {
-               iService = load_registry_service(service);
-       }
-
-       /* Is it a usershare service ? */
-       if (iService < 0 && *lp_usershare_path()) {
-               /* Ensure the name is canonicalized. */
-               strlower_m(service);
-               iService = load_usershare_service(service);
-       }
-
        if (iService >= 0) {
                if (!VALID_SNUM(iService)) {
                        DEBUG(0,("Invalid snum %d for %s\n",iService, service));
@@ -440,6 +448,8 @@ int find_service(fstring service)
                }
        }
 
+  fail:
+
        if (iService < 0)
                DEBUG(3,("find_service() failed to find service %s\n", service));
 
@@ -898,10 +908,28 @@ static connection_struct *make_connection_snum(int snum, user_struct *vuser,
         */
 
        {
+               BOOL can_write = False;
                NT_USER_TOKEN *token = conn->nt_user_token ?
-                       conn->nt_user_token : vuser->nt_user_token;
+                       conn->nt_user_token :
+                       (vuser ? vuser->nt_user_token : NULL);
+
+               /*
+                * I don't believe this can happen. But the
+                * logic above is convoluted enough to confuse
+                * automated checkers, so be sure. JRA.
+                */
+
+               if (token == NULL) {
+                       DEBUG(0,("make_connection: connection to %s "
+                                "denied due to missing "
+                                "NT token.\n",
+                                 lp_servicename(snum)));
+                       conn_free(conn);
+                       *status = NT_STATUS_ACCESS_DENIED;
+                       return NULL;
+               }
 
-               BOOL can_write = share_access_check(token,
+               can_write = share_access_check(token,
                                                    lp_servicename(snum),
                                                    FILE_WRITE_DATA);
 
@@ -946,18 +974,39 @@ static connection_struct *make_connection_snum(int snum, user_struct *vuser,
                set_conn_connectpath(conn,s);
        }
 
+       if ((!conn->printer) && (!conn->ipc)) {
+               conn->notify_ctx = notify_init(conn->mem_ctx, server_id_self(),
+                                              smbd_messaging_context(),
+                                              smbd_event_context(),
+                                              conn);
+       }
+
 /* ROOT Activities: */ 
-       /* check number of connections */
-       if (!claim_connection(conn,
-                             lp_servicename(snum),
-                             lp_max_connections(snum),
-                             False,0)) {
-               DEBUG(1,("too many connections - rejected\n"));
+       /*
+        * Enforce the max connections parameter.
+        */
+
+       if ((lp_max_connections(snum) > 0)
+           && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
+               lp_max_connections(snum))) {
+
+               DEBUG(1, ("Max connections (%d) exceeded for %s\n",
+                         lp_max_connections(snum), lp_servicename(snum)));
                conn_free(conn);
                *status = NT_STATUS_INSUFFICIENT_RESOURCES;
                return NULL;
        }  
 
+       /*
+        * Get us an entry in the connections db
+        */
+       if (!claim_connection(conn, lp_servicename(snum), 0)) {
+               DEBUG(1, ("Could not store connections entry\n"));
+               conn_free(conn);
+               *status = NT_STATUS_INTERNAL_DB_ERROR;
+               return NULL;
+       }  
+
        /* Preexecs are done here as they might make the dir we are to ChDir
         * to below */
        /* execute any "root preexec = " line */
@@ -1062,27 +1111,31 @@ static connection_struct *make_connection_snum(int snum, user_struct *vuser,
                                 strerror(errno) ));
                }
                change_to_root_user();
-               /* Call VFS disconnect hook */    
+               /* Call VFS disconnect hook */
                SMB_VFS_DISCONNECT(conn);
                yield_connection(conn, lp_servicename(snum));
                conn_free(conn);
                *status = NT_STATUS_BAD_NETWORK_NAME;
                return NULL;
        }
-       
+
        string_set(&conn->origpath,conn->connectpath);
-       
+
 #if SOFTLINK_OPTIMISATION
        /* resolve any soft links early if possible */
        if (vfs_ChDir(conn,conn->connectpath) == 0) {
-               pstring s;
-               pstrcpy(s,conn->connectpath);
-               vfs_GetWd(conn,s);
+               TALLOC_CTX *ctx = talloc_stackframe();
+               char *s = vfs_GetWd(ctx,s);
+               if (!s) {
+                       *status = map_nt_error_from_unix(errno);
+                       return NULL;
+               }
                set_conn_connectpath(conn,s);
                vfs_ChDir(conn,conn->connectpath);
+               TALLOC_FREE(ctx);
        }
 #endif
-       
+
        /*
         * Print out the 'connected as' stuff here as we need
         * to know the effective uid and gid we will be using
@@ -1098,7 +1151,7 @@ static connection_struct *make_connection_snum(int snum, user_struct *vuser,
                dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
                dbgtext( "(pid %d)\n", (int)sys_getpid() );
        }
-       
+
        /* we've finished with the user stuff - go back to root */
        change_to_root_user();
        return(conn);
@@ -1188,7 +1241,7 @@ connection_struct *make_connection(const char *service_in, DATA_BLOB password,
 
        if (strequal(service_in,HOMES_NAME)) {
                if(lp_security() != SEC_SHARE) {
-                       DATA_BLOB no_pw = data_blob(NULL, 0);
+                       DATA_BLOB no_pw = data_blob_null;
                        if (vuser->homes_snum == -1) {
                                DEBUG(2, ("[homes] share not available for "
                                          "this user because it was not found "
@@ -1224,7 +1277,7 @@ connection_struct *make_connection(const char *service_in, DATA_BLOB password,
        } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
                   && strequal(service_in,
                               lp_servicename(vuser->homes_snum))) {
-               DATA_BLOB no_pw = data_blob(NULL, 0);
+               DATA_BLOB no_pw = data_blob_null;
                DEBUG(5, ("making a connection to 'homes' service [%s] "
                          "created at session setup time\n", service_in));
                return make_connection_snum(vuser->homes_snum,