source4/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         const struct auth_usersupplied_info *user_info_temp;
  63         nt_status = encrypt_user_info(mem_ctx, ctx->auth_ctx,
  64                                       AUTH_PASSWORD_RESPONSE,
  65                                       user_info, &user_info_temp);
  66         if (!NT_STATUS_IS_OK(nt_status)) {
  67                 return nt_status;
  68         }
  69         user_info = user_info_temp;
  70
  71         ZERO_STRUCT(request);
  72         ZERO_STRUCT(response);
  73         request.flags = WBFLAG_PAM_INFO3_NDR;
  74         fstrcpy(request.data.auth_crap.user,
  75                 user_info->client.account_name);
  76         fstrcpy(request.data.auth_crap.domain,
  77                 user_info->client.domain_name);
  78         fstrcpy(request.data.auth_crap.workstation,
  79                 user_info->workstation_name);
  80
  81         memcpy(request.data.auth_crap.chal, ctx->auth_ctx->challenge.data.data, sizeof(request.data.auth_crap.chal));
  82
  83         request.data.auth_crap.lm_resp_len = MIN(user_info->password.response.lanman.length,
  84                                                  sizeof(request.data.auth_crap.lm_resp));
  85         request.data.auth_crap.nt_resp_len = MIN(user_info->password.response.nt.length,
  86                                                  sizeof(request.data.auth_crap.nt_resp));
  87
  88         memcpy(request.data.auth_crap.lm_resp, user_info->password.response.lanman.data,
  89                request.data.auth_crap.lm_resp_len);
  90         memcpy(request.data.auth_crap.nt_resp, user_info->password.response.nt.data,
  91                request.data.auth_crap.nt_resp_len);
  92
  93         result = winbindd_request(WINBINDD_PAM_AUTH_CRAP, &request, &response);
  94
  95         nt_status = NT_STATUS(response.data.auth.nt_status);
  96         NT_STATUS_NOT_OK_RETURN(nt_status);
  97
  98         if (result == NSS_STATUS_SUCCESS && response.extra_data) {
  99                 union netr_Validation validation;
 100
 101                 nt_status = get_info3_from_ndr(mem_ctx, &response, &info3);
 102                 SAFE_FREE(response.extra_data);
 103                 NT_STATUS_NOT_OK_RETURN(nt_status);
 104
 105                 validation.sam3 = &info3;
 106                 nt_status = make_server_info_netlogon_validation(mem_ctx,
 107                                                                  user_info->client.account_name,
 108                                                                  3, &validation,
 109                                                                  server_info);
 110                 return nt_status;
 111         } else if (result == NSS_STATUS_SUCCESS && !response.extra_data) {
 112                 DEBUG(0, ("Winbindd authenticated the user [%s]\\[%s], "
 113                           "but did not include the required info3 reply!\n",
 114                           user_info->client.domain_name, user_info->client.account_name));
 115                 return NT_STATUS_INSUFFICIENT_LOGON_INFO;
 116         } else if (NT_STATUS_IS_OK(nt_status)) {
 117                 DEBUG(1, ("Winbindd authentication for [%s]\\[%s] failed, "
 118                           "but no error code is available!\n",
 119                           user_info->client.domain_name, user_info->client.account_name));
 120                 return NT_STATUS_NO_LOGON_SERVERS;
 121         }
 122
 123         return nt_status;
 124 }
 125
 126 static const struct auth_operations winbind_ops = {
 127         .name           = "winbind",
 128         .get_challenge  = auth_get_challenge_not_implemented,
 129         .check_password = winbind_check_password
 130 };
 131
 132 NTSTATUS auth_winbind_init(void)
 133 {
 134         NTSTATUS ret;
 135
 136         ret = auth_register(&winbind_ops);
 137         if (!NT_STATUS_IS_OK(ret)) {
 138                 DEBUG(0,("Failed to register 'winbind' auth backend!\n"));
 139                 return ret;
 140         }
 141         return ret;
 142 }