source4/winbind/wb_sam_logon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Do a netr_LogonSamLogon to a remote DC
   5
   6    Copyright (C) Volker Lendecke 2005
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   8    Copyright (C) Stefan Metzmacher 2006
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "libcli/composite/composite.h"
  26 #include "winbind/wb_server.h"
  27 #include "smbd/service_task.h"
  28 #include "auth/credentials/credentials.h"
  29 #include "libcli/auth/libcli_auth.h"
  30 #include "librpc/gen_ndr/ndr_netlogon.h"
  31 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  32 #include "librpc/gen_ndr/winbind.h"
  33
  34 struct wb_sam_logon_state {
  35         struct composite_context *ctx;
  36
  37         struct winbind_SamLogon *req;
  38
  39         struct netlogon_creds_CredentialState *creds_state;
  40         struct netr_Authenticator auth1, auth2;
  41
  42         TALLOC_CTX *r_mem_ctx;
  43         struct netr_LogonSamLogon r;
  44 };
  45
  46 static void wb_sam_logon_recv_domain(struct composite_context *ctx);
  47 static void wb_sam_logon_recv_samlogon(struct rpc_request *req);
  48
  49 /*
  50     Find the connection to the DC (or find an existing connection)
  51 */
  52 struct composite_context *wb_sam_logon_send(TALLOC_CTX *mem_ctx,
  53                                             struct wbsrv_service *service,
  54                                             struct winbind_SamLogon *req)
  55 {
  56         struct composite_context *c, *creq;
  57         struct wb_sam_logon_state *s;
  58
  59         c = composite_create(mem_ctx, service->task->event_ctx);
  60         if (!c) return NULL;
  61
  62         s = talloc_zero(c, struct wb_sam_logon_state);
  63         if (composite_nomem(s, c)) return c;
  64         s->ctx = c;
  65         s->req = req;
  66
  67         c->private_data = s;
  68
  69         creq = wb_sid2domain_send(s, service, service->primary_sid);
  70         composite_continue(c, creq, wb_sam_logon_recv_domain, s);
  71         return c;
  72 }
  73
  74 /*
  75     Having finished making the connection to the DC
  76     Send of a SamLogon request to authenticate a user.
  77 */
  78 static void wb_sam_logon_recv_domain(struct composite_context *creq)
  79 {
  80         struct wb_sam_logon_state *s = talloc_get_type(creq->async.private_data,
  81                                        struct wb_sam_logon_state);
  82         struct rpc_request *req;
  83         struct wbsrv_domain *domain;
  84
  85         s->ctx->status = wb_sid2domain_recv(creq, &domain);
  86         if (!composite_is_ok(s->ctx)) return;
  87
  88         s->creds_state = cli_credentials_get_netlogon_creds(domain->libnet_ctx->cred);
  89         netlogon_creds_client_authenticator(s->creds_state, &s->auth1);
  90
  91         s->r.in.server_name = talloc_asprintf(s, "\\\\%s",
  92                               dcerpc_server_name(domain->netlogon_pipe));
  93         if (composite_nomem(s->r.in.server_name, s->ctx)) return;
  94
  95         s->r.in.computer_name = cli_credentials_get_workstation(domain->libnet_ctx->cred);
  96         s->r.in.credential = &s->auth1;
  97         s->r.in.return_authenticator = &s->auth2;
  98         s->r.in.logon_level = s->req->in.logon_level;
  99         s->r.in.logon = &s->req->in.logon;
 100         s->r.in.validation_level = s->req->in.validation_level;
 101         s->r.out.return_authenticator = NULL;
 102         s->r.out.validation = talloc(s, union netr_Validation);
 103         if (composite_nomem(s->r.out.validation, s->ctx)) return;
 104         s->r.out.authoritative = talloc(s, uint8_t);
 105         if (composite_nomem(s->r.out.authoritative, s->ctx)) return;
 106
 107
 108         /*
 109          * use a new talloc context for the LogonSamLogon call
 110          * because then we can just to a talloc_steal on this context
 111          * in the final _recv() function to give the caller all the content of
 112          * the s->r.out.validation
 113          */
 114         s->r_mem_ctx = talloc_new(s);
 115         if (composite_nomem(s->r_mem_ctx, s->ctx)) return;
 116
 117         req = dcerpc_netr_LogonSamLogon_send(domain->netlogon_pipe, s->r_mem_ctx, &s->r);
 118         composite_continue_rpc(s->ctx, req, wb_sam_logon_recv_samlogon, s);
 119 }
 120
 121 /*
 122    NTLM Authentication
 123
 124    Check the SamLogon reply and decrypt the session keys
 125 */
 126 static void wb_sam_logon_recv_samlogon(struct rpc_request *req)
 127 {
 128         struct wb_sam_logon_state *s = talloc_get_type(req->async.private_data,
 129                                        struct wb_sam_logon_state);
 130
 131         s->ctx->status = dcerpc_ndr_request_recv(req);
 132         if (!composite_is_ok(s->ctx)) return;
 133
 134         s->ctx->status = s->r.out.result;
 135         if (!composite_is_ok(s->ctx)) return;
 136
 137         if ((s->r.out.return_authenticator == NULL) ||
 138             (!netlogon_creds_client_check(s->creds_state,
 139                                           &s->r.out.return_authenticator->cred))) {
 140                 DEBUG(0, ("Credentials check failed!\n"));
 141                 composite_error(s->ctx, NT_STATUS_ACCESS_DENIED);
 142                 return;
 143         }
 144
 145         /* Decrypt the session keys before we reform the info3, so the
 146          * person on the other end of winbindd pipe doesn't have to.
 147          * They won't have the encryption key anyway */
 148         netlogon_creds_decrypt_samlogon(s->creds_state,
 149                                         s->r.in.validation_level,
 150                                         s->r.out.validation);
 151
 152         composite_done(s->ctx);
 153 }
 154
 155 NTSTATUS wb_sam_logon_recv(struct composite_context *c,
 156                            TALLOC_CTX *mem_ctx,
 157                            struct winbind_SamLogon *req)
 158 {
 159         struct wb_sam_logon_state *s = talloc_get_type(c->private_data,
 160                                        struct wb_sam_logon_state);
 161         NTSTATUS status = composite_wait(c);
 162
 163         if (NT_STATUS_IS_OK(status)) {
 164                 talloc_steal(mem_ctx, s->r_mem_ctx);
 165                 req->out.validation     = *s->r.out.validation;
 166                 req->out.authoritative  = 1;
 167         }
 168
 169         talloc_free(s);
 170         return status;
 171 }