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 2 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, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "libcli/composite/composite.h"
  27 #include "winbind/wb_server.h"
  28 #include "smbd/service_task.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "libcli/auth/libcli_auth.h"
  31 #include "librpc/gen_ndr/ndr_netlogon.h"
  32 #include "librpc/gen_ndr/ndr_netlogon_c.h"
  33 #include "librpc/gen_ndr/winbind.h"
  34
  35 struct wb_sam_logon_state {
  36         struct composite_context *ctx;
  37
  38         struct winbind_SamLogon *req;
  39
  40         struct creds_CredentialState *creds_state;
  41         struct netr_Authenticator auth1, auth2;
  42
  43         TALLOC_CTX *r_mem_ctx;
  44         struct netr_LogonSamLogon r;
  45 };
  46
  47 static void wb_sam_logon_recv_domain(struct composite_context *ctx);
  48 static void wb_sam_logon_recv_samlogon(struct rpc_request *req);
  49
  50 /*
  51     Find the connection to the DC (or find an existing connection)
  52 */
  53 struct composite_context *wb_sam_logon_send(TALLOC_CTX *mem_ctx,
  54                                             struct wbsrv_service *service,
  55                                             struct winbind_SamLogon *req)
  56 {
  57         struct composite_context *c, *creq;
  58         struct wb_sam_logon_state *s;
  59
  60         c = composite_create(mem_ctx, service->task->event_ctx);
  61         if (!c) return NULL;
  62
  63         s = talloc_zero(c, struct wb_sam_logon_state);
  64         if (composite_nomem(s, c)) return c;
  65         s->ctx = c;
  66         s->req = req;
  67
  68         c->private_data = s;
  69
  70         creq = wb_sid2domain_send(s, service, service->primary_sid);
  71         composite_continue(c, creq, wb_sam_logon_recv_domain, s);
  72         return c;
  73 }
  74
  75 /*
  76     Finish the connection to the DC
  77     Send of a SamLogon request to authenticate a user.
  78 */
  79 static void wb_sam_logon_recv_domain(struct composite_context *creq)
  80 {
  81         struct wb_sam_logon_state *s = talloc_get_type(creq->async.private_data,
  82                                        struct wb_sam_logon_state);
  83         struct rpc_request *req;
  84         struct wbsrv_domain *domain;
  85
  86         s->ctx->status = wb_sid2domain_recv(creq, &domain);
  87         if (!composite_is_ok(s->ctx)) return;
  88
  89         s->creds_state = cli_credentials_get_netlogon_creds(domain->schannel_creds);
  90         creds_client_authenticator(s->creds_state, &s->auth1);
  91
  92         s->r.in.server_name = talloc_asprintf(s, "\\\\%s",
  93                               dcerpc_server_name(domain->netlogon_pipe));
  94         if (composite_nomem(s->r.in.server_name, s->ctx)) return;
  95
  96         s->r.in.computer_name = cli_credentials_get_workstation(domain->schannel_creds);
  97         s->r.in.credential = &s->auth1;
  98         s->r.in.return_authenticator = &s->auth2;
  99         s->r.in.logon_level = s->req->in.logon_level;
 100         s->r.in.logon = s->req->in.logon;
 101         s->r.in.validation_level = s->req->in.validation_level;
 102         s->r.out.return_authenticator = NULL;
 103
 104         /*
 105          * use a new talloc context for the LogonSamLogon call
 106          * because then we can just to a talloc_steal on this context
 107          * in the final _recv() function to give the caller all the content of
 108          * the s->r.out.validation
 109          */
 110         s->r_mem_ctx = talloc_new(s);
 111         if (composite_nomem(s->r_mem_ctx, s->ctx)) return;
 112
 113         req = dcerpc_netr_LogonSamLogon_send(domain->netlogon_pipe, s->r_mem_ctx, &s->r);
 114         composite_continue_rpc(s->ctx, req, wb_sam_logon_recv_samlogon, s);
 115 }
 116
 117 /*
 118    NTLM Authentication
 119
 120    Check the SamLogon reply and decrypt the session keys
 121 */
 122 static void wb_sam_logon_recv_samlogon(struct rpc_request *req)
 123 {
 124         struct wb_sam_logon_state *s = talloc_get_type(req->async.private,
 125                                        struct wb_sam_logon_state);
 126
 127         s->ctx->status = dcerpc_ndr_request_recv(req);
 128         if (!composite_is_ok(s->ctx)) return;
 129
 130         s->ctx->status = s->r.out.result;
 131         if (!composite_is_ok(s->ctx)) return;
 132
 133         if ((s->r.out.return_authenticator == NULL) ||
 134             (!creds_client_check(s->creds_state,
 135                                  &s->r.out.return_authenticator->cred))) {
 136                 DEBUG(0, ("Credentials check failed!\n"));
 137                 composite_error(s->ctx, NT_STATUS_ACCESS_DENIED);
 138                 return;
 139         }
 140
 141         /* Decrypt the session keys before we reform the info3, so the
 142          * person on the other end of winbindd pipe doesn't have to.
 143          * They won't have the encryption key anyway */
 144         creds_decrypt_samlogon(s->creds_state,
 145                                s->r.in.validation_level,
 146                                &s->r.out.validation);
 147
 148         composite_done(s->ctx);
 149 }
 150
 151 NTSTATUS wb_sam_logon_recv(struct composite_context *c,
 152                            TALLOC_CTX *mem_ctx,
 153                            struct winbind_SamLogon *req)
 154 {
 155         struct wb_sam_logon_state *s = talloc_get_type(c->private_data,
 156                                        struct wb_sam_logon_state);
 157         NTSTATUS status = composite_wait(c);
 158
 159         if (NT_STATUS_IS_OK(status)) {
 160                 talloc_steal(mem_ctx, s->r_mem_ctx);
 161                 req->out.validation     = s->r.out.validation;
 162                 req->out.authoritative  = 1;
 163                 req->out.flags          = 0;
 164         }
 165
 166         talloc_free(s);
 167         return status;
 168 }