Line data    Source code

       1             : /*
       2             :    Unix SMB/CIFS implementation.
       3             : 
       4             :    server side dcerpc common code
       5             : 
       6             :    Copyright (C) Andrew Tridgell 2003-2010
       7             :    Copyright (C) Stefan (metze) Metzmacher 2004-2005
       8             : 
       9             :    This program is free software; you can redistribute it and/or modify
      10             :    it under the terms of the GNU General Public License as published by
      11             :    the Free Software Foundation; either version 3 of the License, or
      12             :    (at your option) any later version.
      13             : 
      14             :    This program is distributed in the hope that it will be useful,
      15             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17             :    GNU General Public License for more details.
      18             : 
      19             :    You should have received a copy of the GNU General Public License
      20             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      21             : */
      22             : 
      23             : #include "includes.h"
      24             : #include "librpc/rpc/dcesrv_core.h"
      25             : #include "librpc/rpc/dcesrv_core_proto.h"
      26             : #include "librpc/rpc/dcerpc_util.h"
      27             : #include "auth/gensec/gensec.h"
      28             : #include "lib/util/dlinklist.h"
      29             : #include "param/param.h"
      30             : 
      31             : /*
      32             :   move a call from an existing linked list to the specified list. This
      33             :   prevents bugs where we forget to remove the call from a previous
      34             :   list when moving it.
      35             :  */
      36      172910 : static void dcesrv_call_set_list(struct dcesrv_call_state *call,
      37             :                                  enum dcesrv_call_list list)
      38             : {
      39      172910 :         switch (call->list) {
      40       15191 :         case DCESRV_LIST_NONE:
      41       15191 :                 break;
      42           0 :         case DCESRV_LIST_CALL_LIST:
      43           0 :                 DLIST_REMOVE(call->conn->call_list, call);
      44           0 :                 break;
      45          46 :         case DCESRV_LIST_FRAGMENTED_CALL_LIST:
      46          46 :                 DLIST_REMOVE(call->conn->incoming_fragmented_call_list, call);
      47          46 :                 break;
      48      157673 :         case DCESRV_LIST_PENDING_CALL_LIST:
      49      157673 :                 DLIST_REMOVE(call->conn->pending_call_list, call);
      50      157673 :                 break;
      51             :         }
      52      172910 :         call->list = list;
      53      172910 :         switch (list) {
      54           0 :         case DCESRV_LIST_NONE:
      55           0 :                 break;
      56      172910 :         case DCESRV_LIST_CALL_LIST:
      57      172910 :                 DLIST_ADD_END(call->conn->call_list, call);
      58      172910 :                 break;
      59           0 :         case DCESRV_LIST_FRAGMENTED_CALL_LIST:
      60           0 :                 DLIST_ADD_END(call->conn->incoming_fragmented_call_list, call);
      61           0 :                 break;
      62           0 :         case DCESRV_LIST_PENDING_CALL_LIST:
      63           0 :                 DLIST_ADD_END(call->conn->pending_call_list, call);
      64           0 :                 break;
      65             :         }
      66      172910 : }
      67             : 
      68             : 
      69      428039 : void dcesrv_init_hdr(struct ncacn_packet *pkt, bool bigendian)
      70             : {
      71      428039 :         pkt->rpc_vers = 5;
      72      428039 :         pkt->rpc_vers_minor = 0;
      73      428039 :         if (bigendian) {
      74           0 :                 pkt->drep[0] = 0;
      75             :         } else {
      76      428039 :                 pkt->drep[0] = DCERPC_DREP_LE;
      77             :         }
      78      428039 :         pkt->drep[1] = 0;
      79      428039 :         pkt->drep[2] = 0;
      80      428039 :         pkt->drep[3] = 0;
      81      428039 : }
      82             : 
      83             : 
      84             : /*
      85             :   return a dcerpc fault
      86             : */
      87       15253 : NTSTATUS dcesrv_fault_with_flags(struct dcesrv_call_state *call,
      88             :                                  uint32_t fault_code,
      89             :                                  uint8_t extra_flags)
      90             : {
      91             :         struct ncacn_packet pkt;
      92             :         struct data_blob_list_item *rep;
      93             :         NTSTATUS status;
      94             : 
      95             :         /* setup a fault */
      96       15253 :         dcesrv_init_hdr(&pkt, lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx));
      97       15253 :         pkt.auth_length = 0;
      98       15253 :         pkt.call_id = call->pkt.call_id;
      99       15253 :         pkt.ptype = DCERPC_PKT_FAULT;
     100       15253 :         pkt.pfc_flags = DCERPC_PFC_FLAG_FIRST | DCERPC_PFC_FLAG_LAST | extra_flags;
     101       15253 :         pkt.u.fault.alloc_hint = 24;
     102       15253 :         if (call->context != NULL) {
     103       15120 :                 pkt.u.fault.context_id = call->context->context_id;
     104             :         } else {
     105         133 :                 pkt.u.fault.context_id = 0;
     106             :         }
     107       15253 :         pkt.u.fault.cancel_count = 0;
     108       15253 :         pkt.u.fault.flags = 0;
     109       15253 :         pkt.u.fault.status = fault_code;
     110       15253 :         pkt.u.fault.reserved = 0;
     111       15253 :         pkt.u.fault.error_and_verifier = data_blob_null;
     112             : 
     113       15253 :         rep = talloc_zero(call, struct data_blob_list_item);
     114       15253 :         if (!rep) {
     115           0 :                 return NT_STATUS_NO_MEMORY;
     116             :         }
     117             : 
     118       15253 :         status = dcerpc_ncacn_push_auth(&rep->blob, call, &pkt, NULL);
     119       15253 :         if (!NT_STATUS_IS_OK(status)) {
     120           0 :                 return status;
     121             :         }
     122             : 
     123       15253 :         dcerpc_set_frag_length(&rep->blob, rep->blob.length);
     124             : 
     125       15253 :         DLIST_ADD_END(call->replies, rep);
     126       15253 :         dcesrv_call_set_list(call, DCESRV_LIST_CALL_LIST);
     127             : 
     128       15253 :         if (call->conn->call_list && call->conn->call_list->replies) {
     129       15253 :                 if (call->conn->transport.report_output_data) {
     130       15253 :                         call->conn->transport.report_output_data(call->conn);
     131             :                 }
     132             :         }
     133             : 
     134       15253 :         return NT_STATUS_OK;
     135             : }
     136             : 
     137       14929 : NTSTATUS dcesrv_fault(struct dcesrv_call_state *call, uint32_t fault_code)
     138             : {
     139       14929 :         return dcesrv_fault_with_flags(call, fault_code, 0);
     140             : }
     141             : 
     142      157673 : _PUBLIC_ NTSTATUS dcesrv_reply(struct dcesrv_call_state *call)
     143             : {
     144             :         struct ndr_push *push;
     145             :         NTSTATUS status;
     146             :         DATA_BLOB stub;
     147             :         uint32_t total_length, chunk_size;
     148      157673 :         struct dcesrv_connection_context *context = call->context;
     149      157673 :         struct dcesrv_auth *auth = call->auth_state;
     150      157673 :         size_t sig_size = 0;
     151             : 
     152             :         /* call the reply function */
     153      157673 :         status = context->iface->reply(call, call, call->r);
     154      157673 :         if (!NT_STATUS_IS_OK(status)) {
     155          16 :                 return dcesrv_fault(call, call->fault_code);
     156             :         }
     157             : 
     158             :         /* form the reply NDR */
     159      157657 :         push = ndr_push_init_ctx(call);
     160      157657 :         NT_STATUS_HAVE_NO_MEMORY(push);
     161             : 
     162             :         /* carry over the pointer count to the reply in case we are
     163             :            using full pointer. See NDR specification for full
     164             :            pointers */
     165      157657 :         push->ptr_count = call->ndr_pull->ptr_count;
     166             : 
     167      157657 :         if (lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx)) {
     168           0 :                 push->flags |= LIBNDR_FLAG_BIGENDIAN;
     169             :         }
     170             : 
     171      157657 :         status = context->iface->ndr_push(call, call, push, call->r);
     172      157657 :         if (!NT_STATUS_IS_OK(status)) {
     173           0 :                 return dcesrv_fault(call, call->fault_code);
     174             :         }
     175             : 
     176      157657 :         stub = ndr_push_blob(push);
     177             : 
     178      157657 :         dcesrv_save_ndr_fuzz_seed(stub,
     179             :                                   call,
     180             :                                   NDR_OUT);
     181             : 
     182      157657 :         total_length = stub.length;
     183             : 
     184             :         /* we can write a full max_recv_frag size, minus the dcerpc
     185             :            request header size */
     186      157657 :         chunk_size = call->conn->max_xmit_frag;
     187      157657 :         chunk_size -= DCERPC_REQUEST_LENGTH;
     188      157657 :         if (auth->auth_finished && auth->gensec_security != NULL) {
     189       73401 :                 size_t max_payload = chunk_size;
     190             : 
     191       73401 :                 max_payload -= DCERPC_AUTH_TRAILER_LENGTH;
     192       73401 :                 max_payload -= (max_payload % DCERPC_AUTH_PAD_ALIGNMENT);
     193             : 
     194       73401 :                 sig_size = gensec_sig_size(auth->gensec_security,
     195             :                                            max_payload);
     196       73401 :                 if (sig_size) {
     197       72216 :                         chunk_size -= DCERPC_AUTH_TRAILER_LENGTH;
     198       72216 :                         chunk_size -= sig_size;
     199             :                 }
     200             :         }
     201      157657 :         chunk_size -= (chunk_size % DCERPC_AUTH_PAD_ALIGNMENT);
     202             : 
     203             :         do {
     204             :                 uint32_t length;
     205             :                 struct data_blob_list_item *rep;
     206             :                 struct ncacn_packet pkt;
     207             :                 bool ok;
     208             : 
     209      390034 :                 rep = talloc_zero(call, struct data_blob_list_item);
     210      390034 :                 NT_STATUS_HAVE_NO_MEMORY(rep);
     211             : 
     212      390034 :                 length = MIN(chunk_size, stub.length);
     213             : 
     214             :                 /* form the dcerpc response packet */
     215      390034 :                 dcesrv_init_hdr(&pkt,
     216      390034 :                                 lpcfg_rpc_big_endian(call->conn->dce_ctx->lp_ctx));
     217      390034 :                 pkt.auth_length = 0;
     218      390034 :                 pkt.call_id = call->pkt.call_id;
     219      390034 :                 pkt.ptype = DCERPC_PKT_RESPONSE;
     220      390034 :                 pkt.pfc_flags = 0;
     221      390034 :                 if (stub.length == total_length) {
     222      157657 :                         pkt.pfc_flags |= DCERPC_PFC_FLAG_FIRST;
     223             :                 }
     224      390034 :                 if (length == stub.length) {
     225      157657 :                         pkt.pfc_flags |= DCERPC_PFC_FLAG_LAST;
     226             :                 }
     227      390034 :                 pkt.u.response.alloc_hint = stub.length;
     228             :                 /*
     229             :                  * bug for bug, feature for feature...
     230             :                  *
     231             :                  * Windows truncates the context_id with & 0xFF,
     232             :                  * so we do.
     233             :                  */
     234      390034 :                 pkt.u.response.context_id = context->context_id & 0xFF;
     235      390034 :                 pkt.u.response.cancel_count = 0;
     236      390034 :                 pkt.u.response.stub_and_verifier.data = stub.data;
     237      390034 :                 pkt.u.response.stub_and_verifier.length = length;
     238             : 
     239      390034 :                 ok = dcesrv_auth_pkt_push(call, &rep->blob, sig_size,
     240             :                                           DCERPC_RESPONSE_LENGTH,
     241             :                                           &pkt.u.response.stub_and_verifier,
     242             :                                           &pkt);
     243      390034 :                 if (!ok) {
     244           0 :                         return dcesrv_fault(call, DCERPC_FAULT_OTHER);
     245             :                 }
     246             : 
     247      390034 :                 dcerpc_set_frag_length(&rep->blob, rep->blob.length);
     248             : 
     249      390034 :                 DLIST_ADD_END(call->replies, rep);
     250             : 
     251      390034 :                 stub.data += length;
     252      390034 :                 stub.length -= length;
     253      390034 :         } while (stub.length != 0);
     254             : 
     255             :         /* move the call from the pending to the finished calls list */
     256      157657 :         dcesrv_call_set_list(call, DCESRV_LIST_CALL_LIST);
     257             : 
     258      157657 :         if (call->conn->call_list && call->conn->call_list->replies) {
     259      157657 :                 if (call->conn->transport.report_output_data) {
     260      157657 :                         call->conn->transport.report_output_data(call->conn);
     261             :                 }
     262             :         }
     263             : 
     264      157657 :         return NT_STATUS_OK;
     265             : }