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_c.h"
  31 #include "librpc/gen_ndr/winbind.h"
  32
  33 struct wb_sam_logon_state {
  34         struct composite_context *ctx;
  35
  36         struct winbind_SamLogon *req;
  37
  38         struct netlogon_creds_CredentialState *creds_state;
  39         struct netr_Authenticator auth1, auth2;
  40
  41         TALLOC_CTX *r_mem_ctx;
  42         struct netr_LogonSamLogon r;
  43 };
  44
  45 static void wb_sam_logon_recv_domain(struct composite_context *ctx);
  46 static void wb_sam_logon_recv_samlogon(struct tevent_req *subreq);
  47
  48 /*
  49     Find the connection to the DC (or find an existing connection)
  50 */
  51 struct composite_context *wb_sam_logon_send(TALLOC_CTX *mem_ctx,
  52                                             struct wbsrv_service *service,
  53                                             struct winbind_SamLogon *req)
  54 {
  55         struct composite_context *c, *creq;
  56         struct wb_sam_logon_state *s;
  57
  58         c = composite_create(mem_ctx, service->task->event_ctx);
  59         if (!c) return NULL;
  60
  61         s = talloc_zero(c, struct wb_sam_logon_state);
  62         if (composite_nomem(s, c)) return c;
  63         s->ctx = c;
  64         s->req = req;
  65
  66         c->private_data = s;
  67
  68         creq = wb_sid2domain_send(s, service, service->primary_sid);
  69         composite_continue(c, creq, wb_sam_logon_recv_domain, s);
  70         return c;
  71 }
  72
  73 /*
  74     Having finished making the connection to the DC
  75     Send of a SamLogon request to authenticate a user.
  76 */
  77 static void wb_sam_logon_recv_domain(struct composite_context *creq)
  78 {
  79         struct wb_sam_logon_state *s = talloc_get_type(creq->async.private_data,
  80                                        struct wb_sam_logon_state);
  81         struct wbsrv_domain *domain;
  82         struct tevent_req *subreq;
  83
  84         s->ctx->status = wb_sid2domain_recv(creq, &domain);
  85         if (!composite_is_ok(s->ctx)) return;
  86
  87         s->creds_state = cli_credentials_get_netlogon_creds(domain->libnet_ctx->cred);
  88         netlogon_creds_client_authenticator(s->creds_state, &s->auth1);
  89
  90         s->r.in.server_name = talloc_asprintf(s, "\\\\%s",
  91                               dcerpc_server_name(domain->netlogon_pipe));
  92         if (composite_nomem(s->r.in.server_name, s->ctx)) return;
  93
  94         s->r.in.computer_name = cli_credentials_get_workstation(domain->libnet_ctx->cred);
  95         s->r.in.credential = &s->auth1;
  96         s->r.in.return_authenticator = &s->auth2;
  97         s->r.in.logon_level = s->req->in.logon_level;
  98         s->r.in.logon = &s->req->in.logon;
  99         s->r.in.validation_level = s->req->in.validation_level;
 100         s->r.out.return_authenticator = NULL;
 101         s->r.out.validation = talloc(s, union netr_Validation);
 102         if (composite_nomem(s->r.out.validation, s->ctx)) return;
 103         s->r.out.authoritative = talloc(s, uint8_t);
 104         if (composite_nomem(s->r.out.authoritative, s->ctx)) return;
 105
 106
 107         /*
 108          * use a new talloc context for the LogonSamLogon 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.validation
 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_LogonSamLogon_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_sam_logon_recv_samlogon, s);
 122 }
 123
 124 /*
 125    NTLM Authentication
 126
 127    Check the SamLogon reply and decrypt the session keys
 128 */
 129 static void wb_sam_logon_recv_samlogon(struct tevent_req *subreq)
 130 {
 131         struct wb_sam_logon_state *s = tevent_req_callback_data(subreq,
 132                                        struct wb_sam_logon_state);
 133
 134         s->ctx->status = dcerpc_netr_LogonSamLogon_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         /* Decrypt the session keys before we reform the info3, so the
 150          * person on the other end of winbindd pipe doesn't have to.
 151          * They won't have the encryption key anyway */
 152         netlogon_creds_decrypt_samlogon(s->creds_state,
 153                                         s->r.in.validation_level,
 154                                         s->r.out.validation);
 155
 156         composite_done(s->ctx);
 157 }
 158
 159 NTSTATUS wb_sam_logon_recv(struct composite_context *c,
 160                            TALLOC_CTX *mem_ctx,
 161                            struct winbind_SamLogon *req)
 162 {
 163         struct wb_sam_logon_state *s = talloc_get_type(c->private_data,
 164                                        struct wb_sam_logon_state);
 165         NTSTATUS status = composite_wait(c);
 166
 167         if (NT_STATUS_IS_OK(status)) {
 168                 talloc_steal(mem_ctx, s->r_mem_ctx);
 169                 req->out.validation     = *s->r.out.validation;
 170                 req->out.authoritative  = 1;
 171         }
 172
 173         talloc_free(s);
 174         return status;
 175 }