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 "libcli/composite/composite.h"
  31 #include "winbind/wb_server.h"
  32 #include "smbd/service_task.h"
  33 #include "auth/credentials/credentials.h"
  34 #include "libcli/auth/libcli_auth.h"
  35 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  36 #include "librpc/gen_ndr/winbind.h"
  37
  38 struct wb_update_rodc_dns_state {
  39         struct composite_context *ctx;
  40
  41         struct winbind_DsrUpdateReadOnlyServerDnsRecords *req;
  42
  43         struct netlogon_creds_CredentialState *creds_state;
  44         struct netr_Authenticator auth1, auth2;
  45
  46         TALLOC_CTX *r_mem_ctx;
  47         struct netr_DsrUpdateReadOnlyServerDnsRecords r;
  48 };
  49
  50 static void wb_update_rodc_dns_recv_domain(struct composite_context *ctx);
  51 static void wb_update_rodc_dns_recv_response(struct tevent_req *subreq);
  52
  53 /*
  54     Find the connection to the DC (or find an existing connection)
  55 */
  56 struct composite_context *wb_update_rodc_dns_send(TALLOC_CTX *mem_ctx,
  57                                             struct wbsrv_service *service,
  58                                             struct winbind_DsrUpdateReadOnlyServerDnsRecords *req)
  59 {
  60         struct composite_context *c, *creq;
  61         struct wb_update_rodc_dns_state *s;
  62
  63         c = composite_create(mem_ctx, service->task->event_ctx);
  64         if (!c) return NULL;
  65
  66         s = talloc_zero(c, struct wb_update_rodc_dns_state);
  67         if (composite_nomem(s, c)) return c;
  68         s->ctx = c;
  69         s->req = req;
  70
  71         c->private_data = s;
  72
  73         creq = wb_sid2domain_send(s, service, service->primary_sid);
  74         composite_continue(c, creq, wb_update_rodc_dns_recv_domain, s);
  75         return c;
  76 }
  77
  78 /*
  79     Having finished making the connection to the DC
  80     Send of a DsrUpdateReadOnlyServerDnsRecords request to authenticate a user.
  81 */
  82 static void wb_update_rodc_dns_recv_domain(struct composite_context *creq)
  83 {
  84         struct wb_update_rodc_dns_state *s = talloc_get_type(creq->async.private_data,
  85                                        struct wb_update_rodc_dns_state);
  86         struct wbsrv_domain *domain;
  87         struct tevent_req *subreq;
  88
  89         s->ctx->status = wb_sid2domain_recv(creq, &domain);
  90         if (!composite_is_ok(s->ctx)) return;
  91
  92         s->creds_state = cli_credentials_get_netlogon_creds(domain->libnet_ctx->cred);
  93         netlogon_creds_client_authenticator(s->creds_state, &s->auth1);
  94
  95         s->r.in.server_name = talloc_asprintf(s, "\\\\%s",
  96                               dcerpc_server_name(domain->netlogon_pipe));
  97         if (composite_nomem(s->r.in.server_name, s->ctx)) return;
  98
  99         s->r.in.computer_name = cli_credentials_get_workstation(domain->libnet_ctx->cred);
 100         s->r.in.credential = &s->auth1;
 101         s->r.out.return_authenticator = &s->auth2;
 102         s->r.in.site_name = s->req->in.site_name;
 103         s->r.in.dns_ttl = s->req->in.dns_ttl;
 104         s->r.in.dns_names = s->req->in.dns_names;
 105         s->r.out.dns_names = s->req->in.dns_names;
 106
 107         /*
 108          * use a new talloc context for the DsrUpdateReadOnlyServerDnsRecords call
 109          * because then we can just to a talloc_steal on this context
 110          * in the final _recv() function to give the caller all the content of
 111          * the s->r.out.dns_names
 112          */
 113         s->r_mem_ctx = talloc_new(s);
 114         if (composite_nomem(s->r_mem_ctx, s->ctx)) return;
 115
 116         subreq = dcerpc_netr_DsrUpdateReadOnlyServerDnsRecords_r_send(s,
 117                                                   s->ctx->event_ctx,
 118                                                   domain->netlogon_pipe->binding_handle,
 119                                                   &s->r);
 120         if (composite_nomem(subreq, s->ctx)) return;
 121         tevent_req_set_callback(subreq, wb_update_rodc_dns_recv_response, s);
 122 }
 123
 124 /*
 125    NTLM Authentication
 126
 127    Check the DsrUpdateReadOnlyServerDnsRecords reply and decrypt the session keys
 128 */
 129 static void wb_update_rodc_dns_recv_response(struct tevent_req *subreq)
 130 {
 131         struct wb_update_rodc_dns_state *s = tevent_req_callback_data(subreq,
 132                                        struct wb_update_rodc_dns_state);
 133
 134         s->ctx->status = dcerpc_netr_DsrUpdateReadOnlyServerDnsRecords_r_recv(subreq, s->r_mem_ctx);
 135         TALLOC_FREE(subreq);
 136         if (!composite_is_ok(s->ctx)) return;
 137
 138         s->ctx->status = s->r.out.result;
 139         if (!composite_is_ok(s->ctx)) return;
 140
 141         if ((s->r.out.return_authenticator == NULL) ||
 142             (!netlogon_creds_client_check(s->creds_state,
 143                                           &s->r.out.return_authenticator->cred))) {
 144                 DEBUG(0, ("Credentials check failed!\n"));
 145                 composite_error(s->ctx, NT_STATUS_ACCESS_DENIED);
 146                 return;
 147         }
 148
 149         composite_done(s->ctx);
 150 }
 151
 152 NTSTATUS wb_update_rodc_dns_recv(struct composite_context *c,
 153                            TALLOC_CTX *mem_ctx,
 154                            struct winbind_DsrUpdateReadOnlyServerDnsRecords *req)
 155 {
 156         struct wb_update_rodc_dns_state *s = talloc_get_type(c->private_data,
 157                                        struct wb_update_rodc_dns_state);
 158         NTSTATUS status = composite_wait(c);
 159
 160         if (NT_STATUS_IS_OK(status)) {
 161                 talloc_steal(mem_ctx, s->r_mem_ctx);
 162                 req->out.dns_names      = s->r.out.dns_names;
 163         }
 164
 165         talloc_free(s);
 166         return status;
 167 }