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_
  42 struct dcesrv_handle *dcesrv_handle_create(struct dcesrv_call_state *call,
  43                                            uint8_t handle_type)
  44 {
  45         struct dcesrv_connection_context *context = call->context;
  46         struct auth_session_info *session_info =
  47                 dcesrv_call_session_info(call);
  48         struct dcesrv_handle *h;
  49         struct dom_sid *sid;
  50
  51         /*
  52          * For simplicty, ensure we abort here for an interface that has no handles (programmer error)
  53          */
  54         SMB_ASSERT((context->iface->flags & DCESRV_INTERFACE_FLAGS_HANDLES_NOT_USED) == 0);
  55
  56         sid = &session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
  57
  58         h = talloc_zero(context->conn->assoc_group, struct dcesrv_handle);
  59         if (!h) {
  60                 return NULL;
  61         }
  62         h->data = NULL;
  63         h->sid = dom_sid_dup(h, sid);
  64         if (h->sid == NULL) {
  65                 talloc_free(h);
  66                 return NULL;
  67         }
  68         h->assoc_group = context->conn->assoc_group;
  69         h->iface = context->iface;
  70         h->wire_handle.handle_type = handle_type;
  71         h->wire_handle.uuid = GUID_random();
  72
  73         DLIST_ADD(context->conn->assoc_group->handles, h);
  74
  75         talloc_set_destructor(h, dcesrv_handle_destructor);
  76
  77         return h;
  78 }
  79
  80 /**
  81   find an internal handle given a wire handle. If the wire handle is NULL then
  82   allocate a new handle
  83 */
  84
  85 _PUBLIC_
  86 struct dcesrv_handle *dcesrv_handle_lookup(struct dcesrv_call_state *call,
  87                                            const struct policy_handle *p,
  88                                            uint8_t handle_type)
  89 {
  90         struct dcesrv_connection_context *context = call->context;
  91         struct auth_session_info *session_info =
  92                 dcesrv_call_session_info(call);
  93         struct dcesrv_handle *h;
  94         struct dom_sid *sid;
  95
  96         /*
  97          * For simplicty, ensure we abort here for an interface that has no handles (programmer error)
  98          */
  99         SMB_ASSERT((context->iface->flags & DCESRV_INTERFACE_FLAGS_HANDLES_NOT_USED) == 0);
 100
 101         sid = &session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
 102
 103         if (ndr_policy_handle_empty(p)) {
 104                 /* TODO: we should probably return a NULL handle here */
 105                 return dcesrv_handle_create(call, handle_type);
 106         }
 107
 108         for (h=context->conn->assoc_group->handles; h; h=h->next) {
 109                 if (h->wire_handle.handle_type == p->handle_type &&
 110                     GUID_equal(&p->uuid, &h->wire_handle.uuid)) {
 111                         if (handle_type != DCESRV_HANDLE_ANY &&
 112                             p->handle_type != handle_type) {
 113                                 DEBUG(0,("client gave us the wrong handle type (%d should be %d)\n",
 114                                          p->handle_type, handle_type));
 115                                 return NULL;
 116                         }
 117                         if (!dom_sid_equal(h->sid, sid)) {
 118                                 DEBUG(0,(__location__ ": Attempt to use invalid sid %s - %s\n",
 119                                          dom_sid_string(context, h->sid),
 120                                          dom_sid_string(context, sid)));
 121                                 return NULL;
 122                         }
 123                         if (h->iface != context->iface) {
 124                                 DEBUG(0,(__location__ ": Attempt to use invalid iface\n"));
 125                                 return NULL;
 126                         }
 127                         return h;
 128                 }
 129         }
 130
 131         return NULL;
 132 }