source3/smbd/conn.c

   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 static int conn_struct_destructor(connection_struct *conn)
  35 {
  36         if (conn->sconn != NULL) {
  37                 DLIST_REMOVE(conn->sconn->connections, conn);
  38                 SMB_ASSERT(conn->sconn->num_connections > 0);
  39                 conn->sconn->num_connections--;
  40                 conn->sconn = NULL;
  41         }
  42         conn_free_internal(conn);
  43         return 0;
  44 }
  45
  46 /****************************************************************************
  47  Return the number of open connections.
  48 ****************************************************************************/
  49
  50 int conn_num_open(struct smbd_server_connection *sconn)
  51 {
  52         return sconn->num_connections;
  53 }
  54
  55 /****************************************************************************
  56  Check if a snum is in use.
  57 ****************************************************************************/
  58
  59 bool conn_snum_used(struct smbd_server_connection *sconn,
  60                     int snum)
  61 {
  62         struct connection_struct *conn;
  63
  64         for (conn=sconn->connections; conn; conn=conn->next) {
  65                 if (conn->params->service == snum) {
  66                         return true;
  67                 }
  68         }
  69
  70         return false;
  71 }
  72
  73 enum protocol_types conn_protocol(struct smbd_server_connection *sconn)
  74 {
  75         if ((sconn != NULL) &&
  76             (sconn->client != NULL) &&
  77             (sconn->client->connections != NULL)) {
  78                 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         return PROTOCOL_COREPLUS;
  85 }
  86
  87 bool conn_using_smb2(struct smbd_server_connection *sconn)
  88 {
  89         enum protocol_types proto = conn_protocol(sconn);
  90         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 connection_struct *conn_new(struct smbd_server_connection *sconn)
 100 {
 101         connection_struct *conn = NULL;
 102
 103         conn = talloc_zero(NULL, connection_struct);
 104         if (conn == NULL) {
 105                 DBG_ERR("talloc_zero failed\n");
 106                 return NULL;
 107         }
 108         conn->params = talloc(conn, struct share_params);
 109         if (conn->params == NULL) {
 110                 DBG_ERR("talloc_zero failed\n");
 111                 TALLOC_FREE(conn);
 112                 return NULL;
 113         }
 114         conn->vuid_cache = talloc_zero(conn, struct vuid_cache);
 115         if (conn->vuid_cache == NULL) {
 116                 DBG_ERR("talloc_zero failed\n");
 117                 TALLOC_FREE(conn);
 118                 return NULL;
 119         }
 120         conn->connectpath = talloc_strdup(conn, "");
 121         if (conn->connectpath == NULL) {
 122                 DBG_ERR("talloc_zero failed\n");
 123                 TALLOC_FREE(conn);
 124                 return NULL;
 125         }
 126         conn->cwd_fsp = talloc_zero(conn, struct files_struct);
 127         if (conn->cwd_fsp == NULL) {
 128                 DBG_ERR("talloc_zero failed\n");
 129                 TALLOC_FREE(conn);
 130                 return NULL;
 131         }
 132         conn->cwd_fsp->fsp_name = synthetic_smb_fname(conn->cwd_fsp,
 133                                                       ".",
 134                                                       NULL,
 135                                                       NULL,
 136                                                       0,
 137                                                       0);
 138         if (conn->cwd_fsp->fsp_name == NULL) {
 139                 TALLOC_FREE(conn);
 140                 return NULL;
 141         }
 142         conn->cwd_fsp->fh = fd_handle_create(conn->cwd_fsp);
 143         if (conn->cwd_fsp->fh == NULL) {
 144                 DBG_ERR("talloc_zero failed\n");
 145                 TALLOC_FREE(conn);
 146                 return NULL;
 147         }
 148         conn->sconn = sconn;
 149         conn->force_group_gid = (gid_t)-1;
 150         fsp_set_fd(conn->cwd_fsp, -1);
 151         conn->cwd_fsp->fnum = FNUM_FIELD_INVALID;
 152         conn->cwd_fsp->conn = conn;
 153
 154         DLIST_ADD(sconn->connections, conn);
 155         sconn->num_connections++;
 156
 157         /*
 158          * Catches the case where someone forgets to call
 159          * conn_free().
 160          */
 161         talloc_set_destructor(conn, conn_struct_destructor);
 162         return conn;
 163 }
 164
 165 /****************************************************************************
 166  Clear a vuid out of the connection's vuid cache
 167 ****************************************************************************/
 168
 169 static void conn_clear_vuid_cache(connection_struct *conn, uint64_t vuid)
 170 {
 171         int i;
 172
 173         for (i=0; i<VUID_CACHE_SIZE; i++) {
 174                 struct vuid_cache_entry *ent;
 175
 176                 ent = &conn->vuid_cache->array[i];
 177
 178                 if (ent->vuid == vuid) {
 179                         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                         if (conn->session_info == ent->session_info) {
 199                                 ent->session_info = NULL;
 200                         } else {
 201                                 TALLOC_FREE(ent->session_info);
 202                         }
 203                         ent->read_only = False;
 204                         ent->share_access = 0;
 205                 }
 206         }
 207 }
 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 void conn_clear_vuid_caches(struct smbd_server_connection *sconn, uint64_t vuid)
 216 {
 217         connection_struct *conn;
 218
 219         for (conn=sconn->connections; conn;conn=conn->next) {
 220                 if (conn->vuid == vuid) {
 221                         conn->vuid = UID_FIELD_INVALID;
 222                 }
 223                 conn_clear_vuid_cache(conn, vuid);
 224         }
 225 }
 226
 227 /****************************************************************************
 228  Free a conn structure - internal part.
 229 ****************************************************************************/
 230
 231 static void conn_free_internal(connection_struct *conn)
 232 {
 233         vfs_handle_struct *handle = NULL, *thandle = NULL;
 234         struct trans_state *state = NULL;
 235
 236         /* Free vfs_connection_struct */
 237         handle = conn->vfs_handles;
 238         while(handle) {
 239                 thandle = handle->next;
 240                 DLIST_REMOVE(conn->vfs_handles, handle);
 241                 if (handle->free_data)
 242                         handle->free_data(&handle->data);
 243                 handle = thandle;
 244         }
 245
 246         /* Free any pending transactions stored on this conn. */
 247         for (state = conn->pending_trans; state; state = state->next) {
 248                 /* state->setup is a talloc child of state. */
 249                 SAFE_FREE(state->param);
 250                 SAFE_FREE(state->data);
 251         }
 252
 253         free_namearray(conn->veto_list);
 254         free_namearray(conn->hide_list);
 255         free_namearray(conn->veto_oplock_list);
 256         free_namearray(conn->aio_write_behind_list);
 257
 258         ZERO_STRUCTP(conn);
 259 }
 260
 261 /****************************************************************************
 262  Free a conn structure.
 263 ****************************************************************************/
 264
 265 void conn_free(connection_struct *conn)
 266 {
 267         TALLOC_FREE(conn);
 268 }
 269
 270 /*
 271  * Correctly initialize a share with case options.
 272  */
 273 void conn_setup_case_options(connection_struct *conn)
 274 {
 275         int snum = conn->params->service;
 276
 277         if (lp_case_sensitive(snum) == Auto) {
 278                 /* We will be setting this per packet. Set to be case
 279                 * insensitive for now. */
 280                 conn->case_sensitive = false;
 281         } else {
 282                 conn->case_sensitive = (bool)lp_case_sensitive(snum);
 283         }
 284
 285         conn->case_preserve = lp_preserve_case(snum);
 286         conn->short_case_preserve = lp_short_preserve_case(snum);
 287 }