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
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "librpc/gen_ndr/ndr_netlogon.h"
  26 #include "auth/auth.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_AUTH
  30
  31 static NTSTATUS get_info3_from_ndr(TALLOC_CTX *mem_ctx, struct winbindd_response *response, struct netr_SamInfo3 *info3)
  32 {
  33         size_t len = response->length - sizeof(struct winbindd_response);
  34         if (len > 4) {
  35                 NTSTATUS status;
  36                 DATA_BLOB blob;
  37                 blob.length = len - 4;
  38                 blob.data = ((char *)response->extra_data) + 4;
  39
  40                 status = ndr_pull_struct_blob(&blob, mem_ctx, info3,
  41                                               (ndr_pull_flags_fn_t)ndr_pull_netr_SamInfo3);
  42
  43                 return status;
  44         } else {
  45                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  46                 return NT_STATUS_UNSUCCESSFUL;
  47         }
  48 }
  49
  50 /* Authenticate a user with a challenge/response */
  51
  52 static NTSTATUS check_winbind_security(const struct auth_context *auth_context,
  53                                      void *my_private_data,
  54                                      TALLOC_CTX *mem_ctx,
  55                                      const struct auth_usersupplied_info *user_info,
  56                                      struct auth_serversupplied_info **server_info)
  57 {
  58         struct winbindd_request request;
  59         struct winbindd_response response;
  60         NSS_STATUS result;
  61         NTSTATUS nt_status;
  62         struct netr_SamInfo3 info3;
  63
  64         if (!user_info) {
  65                 return NT_STATUS_INVALID_PARAMETER;
  66         }
  67
  68         if (!auth_context) {
  69                 DEBUG(3,("Password for user %s cannot be checked because we have no auth_info to get the challenge from.\n",
  70                          user_info->internal_username.str));
  71                 return NT_STATUS_UNSUCCESSFUL;
  72         }
  73
  74         /* Send off request */
  75
  76         ZERO_STRUCT(request);
  77         ZERO_STRUCT(response);
  78         request.flags = WBFLAG_PAM_INFO3_NDR;
  79         fstrcpy(request.data.auth_crap.user,
  80                 user_info->smb_name.str);
  81         fstrcpy(request.data.auth_crap.domain,
  82                           user_info->domain.str);
  83         fstrcpy(request.data.auth_crap.workstation,
  84                           user_info->wksta_name.str);
  85
  86         memcpy(request.data.auth_crap.chal, auth_context->challenge.data, sizeof(request.data.auth_crap.chal));
  87
  88         request.data.auth_crap.lm_resp_len = MIN(user_info->lm_resp.length,
  89                                                  sizeof(request.data.auth_crap.lm_resp));
  90         request.data.auth_crap.nt_resp_len = MIN(user_info->nt_resp.length,
  91                                                  sizeof(request.data.auth_crap.nt_resp));
  92
  93         memcpy(request.data.auth_crap.lm_resp, user_info->lm_resp.data,
  94                request.data.auth_crap.lm_resp_len);
  95         memcpy(request.data.auth_crap.nt_resp, user_info->nt_resp.data,
  96                request.data.auth_crap.nt_resp_len);
  97
  98         result = winbindd_request(WINBINDD_PAM_AUTH_CRAP, &request, &response);
  99
 100         nt_status = NT_STATUS(response.data.auth.nt_status);
 101
 102         if (!NT_STATUS_IS_OK(nt_status)) {
 103                 return nt_status;
 104         }
 105
 106         if (result == NSS_STATUS_SUCCESS && response.extra_data) {
 107                 if (NT_STATUS_IS_OK(nt_status)) {
 108                         if (NT_STATUS_IS_OK(nt_status = get_info3_from_ndr(mem_ctx, &response, &info3))) {
 109                                 nt_status =
 110                                         make_server_info_info3(mem_ctx,
 111                                                                user_info->internal_username.str,
 112                                                                server_info,
 113                                                                &info3);
 114                         }
 115                 }
 116                 SAFE_FREE(response.extra_data);
 117         } else if (result == NSS_STATUS_SUCCESS && !response.extra_data) {
 118                 DEBUG(0, ("Winbindd authenticated the user [%s]\\[%s], "
 119                           "but did not include the required info3 reply!\n",
 120                           user_info->smb_name.str, user_info->domain.str));
 121                 nt_status = NT_STATUS_INSUFFICIENT_LOGON_INFO;
 122         } else if (NT_STATUS_IS_OK(nt_status)) {
 123                 DEBUG(1, ("Winbindd authentication for [%s]\\[%s] failed, "
 124                           "but no error code is available!\n",
 125                           user_info->smb_name.str, user_info->domain.str));
 126                 nt_status = NT_STATUS_NO_LOGON_SERVERS;
 127         }
 128
 129         return nt_status;
 130 }
 131
 132 /* module initialisation */
 133 static NTSTATUS auth_init_winbind(struct auth_context *auth_context,
 134                                           const char *param,
 135                                           struct auth_methods **auth_method)
 136 {
 137         if (!make_auth_methods(auth_context, auth_method))
 138                 return NT_STATUS_NO_MEMORY;
 139
 140         (*auth_method)->name = "winbind";
 141         (*auth_method)->auth = check_winbind_security;
 142         return NT_STATUS_OK;
 143 }
 144
 145 NTSTATUS auth_winbind_init(void)
 146 {
 147         NTSTATUS ret;
 148         struct auth_operations ops;
 149
 150         ops.name = "winbind";
 151         ops.init = auth_init_winbind;
 152         ret = register_backend("auth", &ops);
 153         if (!NT_STATUS_IS_OK(ret)) {
 154                 DEBUG(0,("Failed to register '%s' auth backend!\n",
 155                         ops.name));
 156         }
 157         return ret;
 158 }