source4/winbind/wb_update_rodc_dns.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Do a netr_DsrUpdateReadOnlyServerDnsRecords to a remote DC
   5
   6    Copyright (C) Andrew Bartlett 2010
   7    Copyright (C) Andrew Tridgell 2010
   8
   9    based heavily on wb_sam_logon.c which is copyright:
  10
  11    Copyright (C) Volker Lendecke 2005
  12    Copyright (C) Andrew Bartlett 2005
  13    Copyright (C) Stefan Metzmacher 2006
  14
  15    This program is free software; you can redistribute it and/or modify
  16    it under the terms of the GNU General Public License as published by
  17    the Free Software Foundation; either version 3 of the License, or
  18    (at your option) any later version.
  19
  20    This program is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27 */
  28
  29 #include "includes.h"
  30 #include <tevent.h>
  31 #include "../lib/util/tevent_ntstatus.h"
  32 #include "libcli/composite/composite.h"
  33 #include "winbind/wb_server.h"
  34 #include "smbd/service_task.h"
  35 #include "auth/credentials/credentials.h"
  36 #include "libcli/auth/libcli_auth.h"
  37 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  38 #include "librpc/gen_ndr/winbind.h"
  39
  40 struct wb_update_rodc_dns_state {
  41         struct tevent_context *ev;
  42
  43         struct winbind_DsrUpdateReadOnlyServerDnsRecords *req;
  44
  45         struct netlogon_creds_CredentialState *creds_state;
  46         struct netr_Authenticator auth1, auth2;
  47
  48         TALLOC_CTX *r_mem_ctx;
  49         struct netr_DsrUpdateReadOnlyServerDnsRecords r;
  50 };
  51
  52 static void wb_update_rodc_dns_recv_domain(struct composite_context *csubreq);
  53 static void wb_update_rodc_dns_recv_response(struct tevent_req *subreq);
  54
  55 /*
  56     Find the connection to the DC (or find an existing connection)
  57 */
  58 struct tevent_req *wb_update_rodc_dns_send(TALLOC_CTX *mem_ctx,
  59                                            struct tevent_context *ev,
  60                                            struct wbsrv_service *service,
  61                                            struct winbind_DsrUpdateReadOnlyServerDnsRecords *_req)
  62 {
  63         struct tevent_req *req;
  64         struct wb_update_rodc_dns_state *state;
  65         struct composite_context *csubreq;
  66
  67         req = tevent_req_create(mem_ctx, &state,
  68                                 struct wb_update_rodc_dns_state);
  69         if (req == NULL) {
  70                 return NULL;
  71         }
  72         state->ev = ev;
  73         state->req = _req;
  74
  75         csubreq = wb_sid2domain_send(state, service, service->primary_sid);
  76         if (tevent_req_nomem(csubreq, req)) {
  77                 return tevent_req_post(req, ev);
  78         }
  79         csubreq->async.fn = wb_update_rodc_dns_recv_domain;
  80         csubreq->async.private_data = req;
  81
  82         return req;
  83 }
  84
  85 /*
  86     Having finished making the connection to the DC
  87     Send of a DsrUpdateReadOnlyServerDnsRecords request to authenticate a user.
  88 */
  89 static void wb_update_rodc_dns_recv_domain(struct composite_context *csubreq)
  90 {
  91         struct tevent_req *req =
  92                 talloc_get_type_abort(csubreq->async.private_data,
  93                 struct tevent_req);
  94         struct wb_update_rodc_dns_state *state =
  95                 tevent_req_data(req,
  96                 struct wb_update_rodc_dns_state);
  97         NTSTATUS status;
  98         struct wbsrv_domain *domain;
  99         struct tevent_req *subreq;
 100
 101         status = wb_sid2domain_recv(csubreq, &domain);
 102         if (tevent_req_nterror(req, status)) {
 103                 return;
 104         }
 105
 106         state->creds_state = cli_credentials_get_netlogon_creds(domain->libnet_ctx->cred);
 107         netlogon_creds_client_authenticator(state->creds_state, &state->auth1);
 108
 109         state->r.in.server_name = talloc_asprintf(state, "\\\\%s",
 110                               dcerpc_server_name(domain->netlogon_pipe));
 111         if (tevent_req_nomem(state->r.in.server_name, req)) {
 112                 return;
 113         }
 114
 115         state->r.in.computer_name = cli_credentials_get_workstation(domain->libnet_ctx->cred);
 116         state->r.in.credential = &state->auth1;
 117         state->r.out.return_authenticator = &state->auth2;
 118         state->r.in.site_name = state->req->in.site_name;
 119         state->r.in.dns_ttl = state->req->in.dns_ttl;
 120         state->r.in.dns_names = state->req->in.dns_names;
 121         state->r.out.dns_names = state->req->in.dns_names;
 122
 123         /*
 124          * use a new talloc context for the DsrUpdateReadOnlyServerDnsRecords call
 125          * because then we can just to a talloc_steal on this context
 126          * in the final _recv() function to give the caller all the content of
 127          * the s->r.out.dns_names
 128          */
 129         state->r_mem_ctx = talloc_new(state);
 130         if (tevent_req_nomem(state->r_mem_ctx, req)) {
 131                 return;
 132         }
 133
 134         subreq = dcerpc_netr_DsrUpdateReadOnlyServerDnsRecords_r_send(state,
 135                                                 state->ev,
 136                                                 domain->netlogon_pipe->binding_handle,
 137                                                 &state->r);
 138         if (tevent_req_nomem(subreq, req)) {
 139                 return;
 140         }
 141         tevent_req_set_callback(subreq, wb_update_rodc_dns_recv_response, req);
 142 }
 143
 144 /*
 145    NTLM Authentication
 146
 147    Check the DsrUpdateReadOnlyServerDnsRecords reply and decrypt the session keys
 148 */
 149 static void wb_update_rodc_dns_recv_response(struct tevent_req *subreq)
 150 {
 151         struct tevent_req *req =
 152                 tevent_req_callback_data(subreq,
 153                 struct tevent_req);
 154         struct wb_update_rodc_dns_state *state =
 155                 tevent_req_data(req,
 156                 struct wb_update_rodc_dns_state);
 157         NTSTATUS status;
 158         bool ok;
 159
 160         status = dcerpc_netr_DsrUpdateReadOnlyServerDnsRecords_r_recv(subreq,
 161                                                                 state->r_mem_ctx);
 162         TALLOC_FREE(subreq);
 163         if (tevent_req_nterror(req, status)) {
 164                 return;
 165         }
 166
 167         if (tevent_req_nterror(req, state->r.out.result)) {
 168                 return;
 169         }
 170
 171         if (state->r.out.return_authenticator == NULL) {
 172                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 173                 return;
 174         }
 175
 176         ok = netlogon_creds_client_check(state->creds_state,
 177                                 &state->r.out.return_authenticator->cred);
 178         if (!ok) {
 179                 DEBUG(0, ("Credentials check failed!\n"));
 180                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 181                 return;
 182         }
 183
 184         tevent_req_done(req);
 185 }
 186
 187 NTSTATUS wb_update_rodc_dns_recv(struct tevent_req *req,
 188                         TALLOC_CTX *mem_ctx,
 189                         struct winbind_DsrUpdateReadOnlyServerDnsRecords *_req)
 190 {
 191         struct wb_update_rodc_dns_state *state =
 192                 tevent_req_data(req,
 193                 struct wb_update_rodc_dns_state);
 194         NTSTATUS status;
 195
 196         if (tevent_req_is_nterror(req, &status)) {
 197                 tevent_req_received(req);
 198                 return status;
 199         }
 200
 201         talloc_steal(mem_ctx, state->r_mem_ctx);
 202         _req->out.dns_names = state->r.out.dns_names;
 203
 204         tevent_req_received(req);
 205         return NT_STATUS_OK;
 206 }