source/auth/auth_winbind.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind authentication mechnism
   5
   6    Copyright (C) Tim Potter 2000
   7    Copyright (C) Andrew Bartlett 2001 - 2002
   8    Copyright (C) Stefan Metzmacher 2005
   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 "librpc/gen_ndr/ndr_netlogon.h"
  27 #include "auth/auth.h"
  28 #include "nsswitch/winbind_client.h"
  29
  30 static NTSTATUS get_info3_from_ndr(TALLOC_CTX *mem_ctx, struct winbindd_response *response, struct netr_SamInfo3 *info3)
  31 {
  32         size_t len = response->length - sizeof(struct winbindd_response);
  33         if (len > 4) {
  34                 NTSTATUS status;
  35                 DATA_BLOB blob;
  36                 blob.length = len - 4;
  37                 blob.data = (uint8_t *)(((char *)response->extra_data) + 4);
  38
  39                 status = ndr_pull_struct_blob(&blob, mem_ctx, info3,
  40                                               (ndr_pull_flags_fn_t)ndr_pull_netr_SamInfo3);
  41
  42                 return status;
  43         } else {
  44                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  45                 return NT_STATUS_UNSUCCESSFUL;
  46         }
  47 }
  48
  49 /* Authenticate a user with a challenge/response */
  50 static NTSTATUS winbind_check_password(struct auth_method_context *ctx,
  51                                        TALLOC_CTX *mem_ctx,
  52                                        const struct auth_usersupplied_info *user_info,
  53                                        struct auth_serversupplied_info **server_info)
  54 {
  55         struct winbindd_request request;
  56         struct winbindd_response response;
  57         NSS_STATUS result;
  58         NTSTATUS nt_status;
  59         struct netr_SamInfo3 info3;
  60
  61         /* Send off request */
  62
  63         ZERO_STRUCT(request);
  64         ZERO_STRUCT(response);
  65         request.flags = WBFLAG_PAM_INFO3_NDR;
  66         fstrcpy(request.data.auth_crap.user,
  67                 user_info->account_name);
  68         fstrcpy(request.data.auth_crap.domain,
  69                 user_info->domain_name);
  70         fstrcpy(request.data.auth_crap.workstation,
  71                 user_info->workstation_name);
  72
  73         memcpy(request.data.auth_crap.chal, ctx->auth_ctx->challenge.data.data, sizeof(request.data.auth_crap.chal));
  74
  75         request.data.auth_crap.lm_resp_len = MIN(user_info->lm_resp.length,
  76                                                  sizeof(request.data.auth_crap.lm_resp));
  77         request.data.auth_crap.nt_resp_len = MIN(user_info->nt_resp.length,
  78                                                  sizeof(request.data.auth_crap.nt_resp));
  79
  80         memcpy(request.data.auth_crap.lm_resp, user_info->lm_resp.data,
  81                request.data.auth_crap.lm_resp_len);
  82         memcpy(request.data.auth_crap.nt_resp, user_info->nt_resp.data,
  83                request.data.auth_crap.nt_resp_len);
  84
  85         result = winbindd_request(WINBINDD_PAM_AUTH_CRAP, &request, &response);
  86
  87         nt_status = NT_STATUS(response.data.auth.nt_status);
  88         NT_STATUS_NOT_OK_RETURN(nt_status);
  89
  90         if (result == NSS_STATUS_SUCCESS && response.extra_data) {
  91                 union netr_Validation validation;
  92
  93                 nt_status = get_info3_from_ndr(mem_ctx, &response, &info3);
  94                 SAFE_FREE(response.extra_data);
  95                 NT_STATUS_NOT_OK_RETURN(nt_status);
  96
  97                 validation.sam3 = &info3;
  98                 nt_status = make_server_info_netlogon_validation(mem_ctx,
  99                                                                  user_info->account_name,
 100                                                                  3, &validation,
 101                                                                  server_info);
 102                 return nt_status;
 103         } else if (result == NSS_STATUS_SUCCESS && !response.extra_data) {
 104                 DEBUG(0, ("Winbindd authenticated the user [%s]\\[%s], "
 105                           "but did not include the required info3 reply!\n",
 106                           user_info->domain_name, user_info->account_name));
 107                 return NT_STATUS_INSUFFICIENT_LOGON_INFO;
 108         } else if (NT_STATUS_IS_OK(nt_status)) {
 109                 DEBUG(1, ("Winbindd authentication for [%s]\\[%s] failed, "
 110                           "but no error code is available!\n",
 111                           user_info->domain_name, user_info->account_name));
 112                 return NT_STATUS_NO_LOGON_SERVERS;
 113         }
 114
 115         return nt_status;
 116 }
 117
 118 static const struct auth_operations winbind_ops = {
 119         .name           = "winbind",
 120         .get_challenge  = auth_get_challenge_not_implemented,
 121         .check_password = winbind_check_password
 122 };
 123
 124 NTSTATUS auth_winbind_init(void)
 125 {
 126         NTSTATUS ret;
 127
 128         ret = auth_register(&winbind_ops);
 129         if (!NT_STATUS_IS_OK(ret)) {
 130                 DEBUG(0,("Failed to register 'winbind' auth backend!\n"));
 131                 return ret;
 132         }
 133         return ret;
 134 }