source4/rpc_server/handles.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    server side dcerpc handle code
   5
   6    Copyright (C) Andrew Tridgell 2003
   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 "../lib/util/dlinklist.h"
  24 #include "rpc_server/dcerpc_server.h"
  25 #include "libcli/security/security.h"
  26 #include "auth/session.h"
  27
  28 /*
  29   destroy a rpc handle
  30 */
  31 static int dcesrv_handle_destructor(struct dcesrv_handle *h)
  32 {
  33         DLIST_REMOVE(h->assoc_group->handles, h);
  34         return 0;
  35 }
  36
  37
  38 /*
  39   allocate a new rpc handle
  40 */
  41 _PUBLIC_ struct dcesrv_handle *dcesrv_handle_new(struct dcesrv_connection_context *context,
  42                                                  uint8_t handle_type)
  43 {
  44         struct dcesrv_handle *h;
  45         struct dom_sid *sid;
  46
  47         /*
  48          * For simplicty, ensure we abort here for an interface that has no handles (programmer error)
  49          */
  50         SMB_ASSERT((context->iface->flags & DCESRV_INTERFACE_FLAGS_HANDLES_NOT_USED) == 0);
  51
  52         sid = &context->conn->auth_state.session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
  53
  54         h = talloc_zero(context->conn->assoc_group, struct dcesrv_handle);
  55         if (!h) {
  56                 return NULL;
  57         }
  58         h->data = NULL;
  59         h->sid = dom_sid_dup(h, sid);
  60         if (h->sid == NULL) {
  61                 talloc_free(h);
  62                 return NULL;
  63         }
  64         h->assoc_group = context->conn->assoc_group;
  65         h->iface = context->iface;
  66         h->wire_handle.handle_type = handle_type;
  67         h->wire_handle.uuid = GUID_random();
  68
  69         DLIST_ADD(context->conn->assoc_group->handles, h);
  70
  71         talloc_set_destructor(h, dcesrv_handle_destructor);
  72
  73         return h;
  74 }
  75
  76 /**
  77   find an internal handle given a wire handle. If the wire handle is NULL then
  78   allocate a new handle
  79 */
  80 _PUBLIC_ struct dcesrv_handle *dcesrv_handle_fetch(
  81                                           struct dcesrv_connection_context *context,
  82                                           struct policy_handle *p,
  83                                           uint8_t handle_type)
  84 {
  85         struct dcesrv_handle *h;
  86         struct dom_sid *sid;
  87
  88         /*
  89          * For simplicty, ensure we abort here for an interface that has no handles (programmer error)
  90          */
  91         SMB_ASSERT((context->iface->flags & DCESRV_INTERFACE_FLAGS_HANDLES_NOT_USED) == 0);
  92
  93         sid = &context->conn->auth_state.session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
  94
  95         if (ndr_policy_handle_empty(p)) {
  96                 /* TODO: we should probably return a NULL handle here */
  97                 return dcesrv_handle_new(context, handle_type);
  98         }
  99
 100         for (h=context->conn->assoc_group->handles; h; h=h->next) {
 101                 if (h->wire_handle.handle_type == p->handle_type &&
 102                     GUID_equal(&p->uuid, &h->wire_handle.uuid)) {
 103                         if (handle_type != DCESRV_HANDLE_ANY &&
 104                             p->handle_type != handle_type) {
 105                                 DEBUG(0,("client gave us the wrong handle type (%d should be %d)\n",
 106                                          p->handle_type, handle_type));
 107                                 return NULL;
 108                         }
 109                         if (!dom_sid_equal(h->sid, sid)) {
 110                                 DEBUG(0,(__location__ ": Attempt to use invalid sid %s - %s\n",
 111                                          dom_sid_string(context, h->sid),
 112                                          dom_sid_string(context, sid)));
 113                                 return NULL;
 114                         }
 115                         if (h->iface != context->iface) {
 116                                 DEBUG(0,(__location__ ": Attempt to use invalid iface\n"));
 117                                 return NULL;
 118                         }
 119                         return h;
 120                 }
 121         }
 122
 123         return NULL;
 124 }