Line data    Source code

       1             : /*
       2             :    Unix SMB/CIFS implementation.
       3             :    Manage connections_struct structures
       4             :    Copyright (C) Andrew Tridgell 1998
       5             :    Copyright (C) Alexander Bokovoy 2002
       6             :    Copyright (C) Jeremy Allison 2010
       7             : 
       8             :    This program is free software; you can redistribute it and/or modify
       9             :    it under the terms of the GNU General Public License as published by
      10             :    the Free Software Foundation; either version 3 of the License, or
      11             :    (at your option) any later version.
      12             : 
      13             :    This program is distributed in the hope that it will be useful,
      14             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      16             :    GNU General Public License for more details.
      17             : 
      18             :    You should have received a copy of the GNU General Public License
      19             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      20             : */
      21             : 
      22             : #include "includes.h"
      23             : #include "smbd/smbd.h"
      24             : #include "smbd/globals.h"
      25             : #include "lib/util/bitmap.h"
      26             : 
      27             : static void conn_free_internal(connection_struct *conn);
      28             : 
      29             : /****************************************************************************
      30             :  * Remove a conn struct from conn->sconn->connections
      31             :  * if not already done.
      32             : ****************************************************************************/
      33             : 
      34       58656 : static int conn_struct_destructor(connection_struct *conn)
      35             : {
      36       58656 :         if (conn->sconn != NULL) {
      37       58656 :                 DLIST_REMOVE(conn->sconn->connections, conn);
      38       58656 :                 SMB_ASSERT(conn->sconn->num_connections > 0);
      39       58656 :                 conn->sconn->num_connections--;
      40       58656 :                 conn->sconn = NULL;
      41             :         }
      42       58656 :         conn_free_internal(conn);
      43       58656 :         return 0;
      44             : }
      45             : 
      46             : /****************************************************************************
      47             :  Return the number of open connections.
      48             : ****************************************************************************/
      49             : 
      50        9948 : int conn_num_open(struct smbd_server_connection *sconn)
      51             : {
      52        9948 :         return sconn->num_connections;
      53             : }
      54             : 
      55             : /****************************************************************************
      56             :  Check if a snum is in use.
      57             : ****************************************************************************/
      58             : 
      59      107956 : bool conn_snum_used(struct smbd_server_connection *sconn,
      60             :                     int snum)
      61             : {
      62           0 :         struct connection_struct *conn;
      63             : 
      64      166560 :         for (conn=sconn->connections; conn; conn=conn->next) {
      65       59288 :                 if (conn->params->service == snum) {
      66         684 :                         return true;
      67             :                 }
      68             :         }
      69             : 
      70      107272 :         return false;
      71             : }
      72             : 
      73     4022965 : enum protocol_types conn_protocol(struct smbd_server_connection *sconn)
      74             : {
      75     4022965 :         if ((sconn != NULL) &&
      76     4022965 :             (sconn->client != NULL) &&
      77     4022911 :             (sconn->client->connections != NULL)) {
      78     4022911 :                 return sconn->client->connections->protocol;
      79             :         }
      80             :         /*
      81             :          * Default to what source3/lib/util.c has as default for the
      82             :          * static Protocol variable to not change behaviour.
      83             :          */
      84          54 :         return PROTOCOL_COREPLUS;
      85             : }
      86             : 
      87     2790645 : bool conn_using_smb2(struct smbd_server_connection *sconn)
      88             : {
      89     2790645 :         enum protocol_types proto = conn_protocol(sconn);
      90     2790645 :         return (proto >= PROTOCOL_SMB2_02);
      91             : }
      92             : 
      93             : /****************************************************************************
      94             :  Find first available connection slot, starting from a random position.
      95             :  The randomisation stops problems with the server dying and clients
      96             :  thinking the server is still available.
      97             : ****************************************************************************/
      98             : 
      99       58682 : connection_struct *conn_new(struct smbd_server_connection *sconn)
     100             : {
     101       58682 :         connection_struct *conn = NULL;
     102             : 
     103       58682 :         conn = talloc_zero(NULL, connection_struct);
     104       58682 :         if (conn == NULL) {
     105           0 :                 DBG_ERR("talloc_zero failed\n");
     106           0 :                 return NULL;
     107             :         }
     108       58682 :         conn->params = talloc(conn, struct share_params);
     109       58682 :         if (conn->params == NULL) {
     110           0 :                 DBG_ERR("talloc_zero failed\n");
     111           0 :                 TALLOC_FREE(conn);
     112           0 :                 return NULL;
     113             :         }
     114       58682 :         conn->vuid_cache = talloc_zero(conn, struct vuid_cache);
     115       58682 :         if (conn->vuid_cache == NULL) {
     116           0 :                 DBG_ERR("talloc_zero failed\n");
     117           0 :                 TALLOC_FREE(conn);
     118           0 :                 return NULL;
     119             :         }
     120       58682 :         conn->connectpath = talloc_strdup(conn, "");
     121       58682 :         if (conn->connectpath == NULL) {
     122           0 :                 DBG_ERR("talloc_zero failed\n");
     123           0 :                 TALLOC_FREE(conn);
     124           0 :                 return NULL;
     125             :         }
     126       58682 :         conn->cwd_fsp = talloc_zero(conn, struct files_struct);
     127       58682 :         if (conn->cwd_fsp == NULL) {
     128           0 :                 DBG_ERR("talloc_zero failed\n");
     129           0 :                 TALLOC_FREE(conn);
     130           0 :                 return NULL;
     131             :         }
     132       58682 :         conn->cwd_fsp->fsp_name = synthetic_smb_fname(conn->cwd_fsp,
     133             :                                                       ".",
     134             :                                                       NULL,
     135             :                                                       NULL,
     136             :                                                       0,
     137             :                                                       0);
     138       58682 :         if (conn->cwd_fsp->fsp_name == NULL) {
     139           0 :                 TALLOC_FREE(conn);
     140           0 :                 return NULL;
     141             :         }
     142       58682 :         conn->cwd_fsp->fh = fd_handle_create(conn->cwd_fsp);
     143       58682 :         if (conn->cwd_fsp->fh == NULL) {
     144           0 :                 DBG_ERR("talloc_zero failed\n");
     145           0 :                 TALLOC_FREE(conn);
     146           0 :                 return NULL;
     147             :         }
     148       58682 :         conn->sconn = sconn;
     149       58682 :         conn->force_group_gid = (gid_t)-1;
     150       58682 :         fsp_set_fd(conn->cwd_fsp, -1);
     151       58682 :         conn->cwd_fsp->fnum = FNUM_FIELD_INVALID;
     152       58682 :         conn->cwd_fsp->conn = conn;
     153             : 
     154       58682 :         DLIST_ADD(sconn->connections, conn);
     155       58682 :         sconn->num_connections++;
     156             : 
     157             :         /*
     158             :          * Catches the case where someone forgets to call
     159             :          * conn_free().
     160             :          */
     161       58682 :         talloc_set_destructor(conn, conn_struct_destructor);
     162       58682 :         return conn;
     163             : }
     164             : 
     165             : /****************************************************************************
     166             :  Clear a vuid out of the connection's vuid cache
     167             : ****************************************************************************/
     168             : 
     169         292 : static void conn_clear_vuid_cache(connection_struct *conn, uint64_t vuid)
     170             : {
     171          38 :         int i;
     172             : 
     173        9636 :         for (i=0; i<VUID_CACHE_SIZE; i++) {
     174        1216 :                 struct vuid_cache_entry *ent;
     175             : 
     176        9344 :                 ent = &conn->vuid_cache->array[i];
     177             : 
     178        9344 :                 if (ent->vuid == vuid) {
     179         190 :                         ent->vuid = UID_FIELD_INVALID;
     180             :                         /*
     181             :                          * We need to keep conn->session_info around
     182             :                          * if it's equal to ent->session_info as a SMBulogoff
     183             :                          * is often followed by a SMBtdis (with an invalid
     184             :                          * vuid). The debug code (or regular code in
     185             :                          * vfs_full_audit) wants to refer to the
     186             :                          * conn->session_info pointer to print debug
     187             :                          * statements. Theoretically this is a bug,
     188             :                          * as once the vuid is gone the session_info
     189             :                          * on the conn struct isn't valid any more,
     190             :                          * but there's enough code that assumes
     191             :                          * conn->session_info is never null that
     192             :                          * it's easier to hold onto the old pointer
     193             :                          * until we get a new sessionsetupX.
     194             :                          * As everything is hung off the
     195             :                          * conn pointer as a talloc context we're not
     196             :                          * leaking memory here. See bug #6315. JRA.
     197             :                          */
     198         190 :                         if (conn->session_info == ent->session_info) {
     199         190 :                                 ent->session_info = NULL;
     200             :                         } else {
     201           0 :                                 TALLOC_FREE(ent->session_info);
     202             :                         }
     203         190 :                         ent->read_only = False;
     204         190 :                         ent->share_access = 0;
     205             :                 }
     206             :         }
     207         292 : }
     208             : 
     209             : /****************************************************************************
     210             :  Clear a vuid out of the validity cache, and as the 'owner' of a connection.
     211             : 
     212             :  Called from invalidate_vuid()
     213             : ****************************************************************************/
     214             : 
     215       29763 : void conn_clear_vuid_caches(struct smbd_server_connection *sconn, uint64_t vuid)
     216             : {
     217         806 :         connection_struct *conn;
     218             : 
     219       30055 :         for (conn=sconn->connections; conn;conn=conn->next) {
     220         292 :                 if (conn->vuid == vuid) {
     221         190 :                         conn->vuid = UID_FIELD_INVALID;
     222             :                 }
     223         292 :                 conn_clear_vuid_cache(conn, vuid);
     224             :         }
     225       29763 : }
     226             : 
     227             : /****************************************************************************
     228             :  Free a conn structure - internal part.
     229             : ****************************************************************************/
     230             : 
     231       58656 : static void conn_free_internal(connection_struct *conn)
     232             : {
     233       58656 :         vfs_handle_struct *handle = NULL, *thandle = NULL;
     234       58656 :         struct trans_state *state = NULL;
     235             : 
     236             :         /* Free vfs_connection_struct */
     237       58656 :         handle = conn->vfs_handles;
     238      436209 :         while(handle) {
     239      377553 :                 thandle = handle->next;
     240      377553 :                 DLIST_REMOVE(conn->vfs_handles, handle);
     241      377553 :                 if (handle->free_data)
     242       55397 :                         handle->free_data(&handle->data);
     243      372304 :                 handle = thandle;
     244             :         }
     245             : 
     246             :         /* Free any pending transactions stored on this conn. */
     247       58656 :         for (state = conn->pending_trans; state; state = state->next) {
     248             :                 /* state->setup is a talloc child of state. */
     249           0 :                 SAFE_FREE(state->param);
     250           0 :                 SAFE_FREE(state->data);
     251             :         }
     252             : 
     253       58656 :         free_namearray(conn->veto_list);
     254       58656 :         free_namearray(conn->hide_list);
     255       58656 :         free_namearray(conn->veto_oplock_list);
     256       58656 :         free_namearray(conn->aio_write_behind_list);
     257             : 
     258       58656 :         ZERO_STRUCTP(conn);
     259       58656 : }
     260             : 
     261             : /****************************************************************************
     262             :  Free a conn structure.
     263             : ****************************************************************************/
     264             : 
     265       58656 : void conn_free(connection_struct *conn)
     266             : {
     267       58656 :         TALLOC_FREE(conn);
     268       58656 : }
     269             : 
     270             : /*
     271             :  * Correctly initialize a share with case options.
     272             :  */
     273       58610 : void conn_setup_case_options(connection_struct *conn)
     274             : {
     275       58610 :         int snum = conn->params->service;
     276             : 
     277       58610 :         if (lp_case_sensitive(snum) == Auto) {
     278             :                 /* We will be setting this per packet. Set to be case
     279             :                 * insensitive for now. */
     280       58500 :                 conn->case_sensitive = false;
     281             :         } else {
     282         110 :                 conn->case_sensitive = (bool)lp_case_sensitive(snum);
     283             :         }
     284             : 
     285       58610 :         conn->case_preserve = lp_preserve_case(snum);
     286       58610 :         conn->short_case_preserve = lp_short_preserve_case(snum);
     287       58610 : }