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         struct vuid_cache_entry *ent = NULL;
 172         int i;
 173
 174         for (i=0; i<VUID_CACHE_SIZE; i++) {
 175                 ent = &conn->vuid_cache->array[i];
 176                 if (ent->vuid != vuid) {
 177                         continue;
 178                 }
 179         }
 180         if (i == VUID_CACHE_SIZE) {
 181                 return;
 182         }
 183
 184         ent->vuid = UID_FIELD_INVALID;
 185
 186         /*
 187          * We need to keep conn->session_info around
 188          * if it's equal to ent->session_info as a SMBulogoff
 189          * is often followed by a SMBtdis (with an invalid
 190          * vuid). The debug code (or regular code in
 191          * vfs_full_audit) wants to refer to the
 192          * conn->session_info pointer to print debug
 193          * statements. Theoretically this is a bug,
 194          * as once the vuid is gone the session_info
 195          * on the conn struct isn't valid any more,
 196          * but there's enough code that assumes
 197          * conn->session_info is never null that
 198          * it's easier to hold onto the old pointer
 199          * until we get a new sessionsetupX.
 200          * As everything is hung off the
 201          * conn pointer as a talloc context we're not
 202          * leaking memory here. See bug #6315. JRA.
 203          */
 204         if (conn->session_info == ent->session_info) {
 205                 ent->session_info = NULL;
 206         } else {
 207                 TALLOC_FREE(ent->session_info);
 208         }
 209         ent->read_only = False;
 210         ent->share_access = 0;
 211         TALLOC_FREE(ent->veto_list);
 212         TALLOC_FREE(ent->hide_list);
 213 }
 214
 215 /****************************************************************************
 216  Clear a vuid out of the validity cache, and as the 'owner' of a connection.
 217
 218  Called from invalidate_vuid()
 219 ****************************************************************************/
 220
 221 void conn_clear_vuid_caches(struct smbd_server_connection *sconn, uint64_t vuid)
 222 {
 223         connection_struct *conn;
 224
 225         for (conn=sconn->connections; conn;conn=conn->next) {
 226                 if (conn->vuid == vuid) {
 227                         conn->vuid = UID_FIELD_INVALID;
 228                 }
 229                 conn_clear_vuid_cache(conn, vuid);
 230         }
 231 }
 232
 233 /****************************************************************************
 234  Free a conn structure - internal part.
 235 ****************************************************************************/
 236
 237 static void conn_free_internal(connection_struct *conn)
 238 {
 239         vfs_handle_struct *handle = NULL, *thandle = NULL;
 240         struct trans_state *state = NULL;
 241
 242         /* Free vfs_connection_struct */
 243         handle = conn->vfs_handles;
 244         while(handle) {
 245                 thandle = handle->next;
 246                 DLIST_REMOVE(conn->vfs_handles, handle);
 247                 if (handle->free_data)
 248                         handle->free_data(&handle->data);
 249                 handle = thandle;
 250         }
 251
 252         /* Free any pending transactions stored on this conn. */
 253         for (state = conn->pending_trans; state; state = state->next) {
 254                 /* state->setup is a talloc child of state. */
 255                 SAFE_FREE(state->param);
 256                 SAFE_FREE(state->data);
 257         }
 258
 259         ZERO_STRUCTP(conn);
 260 }
 261
 262 /****************************************************************************
 263  Free a conn structure.
 264 ****************************************************************************/
 265
 266 void conn_free(connection_struct *conn)
 267 {
 268         TALLOC_FREE(conn);
 269 }
 270
 271 /*
 272  * Correctly initialize a share with case options.
 273  */
 274 void conn_setup_case_options(connection_struct *conn)
 275 {
 276         int snum = conn->params->service;
 277
 278         if (lp_case_sensitive(snum) == Auto) {
 279                 /* We will be setting this per packet. Set to be case
 280                 * insensitive for now. */
 281                 conn->case_sensitive = false;
 282         } else {
 283                 conn->case_sensitive = (bool)lp_case_sensitive(snum);
 284         }
 285
 286         conn->case_preserve = lp_preserve_case(snum);
 287         conn->short_case_preserve = lp_short_preserve_case(snum);
 288 }