source/smb_server/session.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell 1992-2005
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   6    Copyright (C) Stefan Metzmacher 2005-2006
   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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "smb_server/smb_server.h"
  25 #include "lib/util/dlinklist.h"
  26
  27
  28 /*
  29  * init the sessions structures
  30  */
  31 NTSTATUS smbsrv_init_sessions(struct smbsrv_connection *smb_conn, uint64_t limit)
  32 {
  33         /*
  34          * the idr_* functions take 'int' as limit,
  35          * and only work with a max limit 0x00FFFFFF
  36          */
  37         limit &= 0x00FFFFFF;
  38
  39         smb_conn->sessions.idtree_vuid  = idr_init(smb_conn);
  40         NT_STATUS_HAVE_NO_MEMORY(smb_conn->sessions.idtree_vuid);
  41         smb_conn->sessions.idtree_limit = limit;
  42         smb_conn->sessions.list         = NULL;
  43
  44         return NT_STATUS_OK;
  45 }
  46
  47 /*
  48  * Find the session structure assoicated with a VUID
  49  * (not one from an in-progress session setup)
  50  */
  51 struct smbsrv_session *smbsrv_session_find(struct smbsrv_connection *smb_conn,
  52                                            uint64_t vuid, struct timeval request_time)
  53 {
  54         void *p;
  55         struct smbsrv_session *sess;
  56
  57         if (vuid == 0) return NULL;
  58
  59         if (vuid > smb_conn->sessions.idtree_limit) return NULL;
  60
  61         p = idr_find(smb_conn->sessions.idtree_vuid, vuid);
  62         if (!p) return NULL;
  63
  64         /* only return a finished session */
  65         sess = talloc_get_type(p, struct smbsrv_session);
  66         if (sess && sess->session_info) {
  67                 sess->statistics.last_request_time = request_time;
  68                 return sess;
  69         }
  70
  71         return NULL;
  72 }
  73
  74 /*
  75  * Find the session structure assoicated with a VUID
  76  * (assoicated with an in-progress session setup)
  77  */
  78 struct smbsrv_session *smbsrv_session_find_sesssetup(struct smbsrv_connection *smb_conn, uint64_t vuid)
  79 {
  80         void *p;
  81         struct smbsrv_session *sess;
  82
  83         if (vuid == 0) return NULL;
  84
  85         if (vuid > smb_conn->sessions.idtree_limit) return NULL;
  86
  87         p = idr_find(smb_conn->sessions.idtree_vuid, vuid);
  88         if (!p) return NULL;
  89
  90         /* only return an unfinished session */
  91         sess = talloc_get_type(p, struct smbsrv_session);
  92         if (sess && !sess->session_info) {
  93                 return sess;
  94         }
  95         return NULL;
  96 }
  97
  98 /*
  99  * the session will be marked as valid for usage
 100  * by attaching a auth_session_info to the session.
 101  *
 102  * session_info will be talloc_stealed
 103  */
 104 NTSTATUS smbsrv_session_sesssetup_finished(struct smbsrv_session *sess,
 105                                            struct auth_session_info *session_info)
 106 {
 107         /* this check is to catch programmer errors */
 108         if (!session_info) {
 109                 talloc_free(sess);
 110                 return NT_STATUS_ACCESS_DENIED;
 111         }
 112
 113         /* mark the session as successful authenticated */
 114         sess->session_info = talloc_steal(sess, session_info);
 115
 116         /* now fill in some statistics */
 117         sess->statistics.auth_time = timeval_current();
 118
 119         return NT_STATUS_OK;
 120 }
 121
 122 /****************************************************************************
 123 destroy a session structure
 124 ****************************************************************************/
 125 static int smbsrv_session_destructor(struct smbsrv_session *sess)
 126 {
 127         struct smbsrv_connection *smb_conn = sess->smb_conn;
 128
 129         idr_remove(smb_conn->sessions.idtree_vuid, sess->vuid);
 130         DLIST_REMOVE(smb_conn->sessions.list, sess);
 131         return 0;
 132 }
 133
 134 /*
 135  * allocate a new session structure with a VUID.
 136  * gensec_ctx is optional, but talloc_steal'ed when present
 137  */
 138 struct smbsrv_session *smbsrv_session_new(struct smbsrv_connection *smb_conn,
 139                                           struct gensec_security *gensec_ctx)
 140 {
 141         struct smbsrv_session *sess = NULL;
 142         int i;
 143
 144         /* Ensure no vuid gets registered in share level security. */
 145         if (smb_conn->config.security == SEC_SHARE) return NULL;
 146
 147         sess = talloc_zero(smb_conn, struct smbsrv_session);
 148         if (!sess) return NULL;
 149         sess->smb_conn = smb_conn;
 150
 151         i = idr_get_new_random(smb_conn->sessions.idtree_vuid, sess, smb_conn->sessions.idtree_limit);
 152         if (i == -1) {
 153                 DEBUG(1,("ERROR! Out of connection structures\n"));
 154                 talloc_free(sess);
 155                 return NULL;
 156         }
 157         sess->vuid = i;
 158
 159         /* use this to keep tabs on all our info from the authentication */
 160         sess->gensec_ctx = talloc_steal(sess, gensec_ctx);
 161
 162         DLIST_ADD(smb_conn->sessions.list, sess);
 163         talloc_set_destructor(sess, smbsrv_session_destructor);
 164
 165         /* now fill in some statistics */
 166         sess->statistics.connect_time = timeval_current();
 167
 168         return sess;
 169 }