source3/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
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_AUTH
  28
  29 static NTSTATUS get_info3_from_ndr(TALLOC_CTX *mem_ctx, struct winbindd_response *response, NET_USER_INFO_3 *info3)
  30 {
  31         uint8 *info3_ndr;
  32         size_t len = response->length - sizeof(response);
  33         prs_struct ps;
  34         if (len > 0) {
  35                 info3_ndr = response->extra_data;
  36                 if (!prs_init(&ps, len, mem_ctx, UNMARSHALL)) {
  37                         return NT_STATUS_NO_MEMORY;
  38                 }
  39                 prs_copy_data_in(&ps, info3_ndr, len);
  40                 prs_set_offset(&ps,0);
  41                 if (!net_io_user_info3("", info3, &ps, 1, 3)) {
  42                         DEBUG(2, ("get_info3_from_ndr: could not parse info3 struct!\n"));
  43                         return NT_STATUS_UNSUCCESSFUL;
  44                 }
  45                 prs_mem_free(&ps);
  46
  47                 return NT_STATUS_OK;
  48         } else {
  49                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  50                 return NT_STATUS_UNSUCCESSFUL;
  51         }
  52 }
  53
  54 /* Authenticate a user with a challenge/response */
  55
  56 static NTSTATUS check_winbind_security(const struct auth_context *auth_context,
  57                                        void *my_private_data,
  58                                        TALLOC_CTX *mem_ctx,
  59                                        const auth_usersupplied_info *user_info,
  60                                        auth_serversupplied_info **server_info)
  61 {
  62         struct winbindd_request request;
  63         struct winbindd_response response;
  64         NSS_STATUS result;
  65         NTSTATUS nt_status;
  66         NET_USER_INFO_3 info3;
  67
  68         if (!user_info) {
  69                 return NT_STATUS_INVALID_PARAMETER;
  70         }
  71
  72         if (!auth_context) {
  73                 DEBUG(3,("Password for user %s cannot be checked because we have no auth_info to get the challenge from.\n",
  74                          user_info->internal_username.str));
  75                 return NT_STATUS_UNSUCCESSFUL;
  76         }
  77
  78         /* Send off request */
  79
  80         ZERO_STRUCT(request);
  81         ZERO_STRUCT(response);
  82
  83         request.data.auth_crap.flags = WINBIND_PAM_INFO3_NDR;
  84
  85         push_utf8_fstring(request.data.auth_crap.user,
  86                           user_info->smb_name.str);
  87         push_utf8_fstring(request.data.auth_crap.domain,
  88                           user_info->domain.str);
  89         push_utf8_fstring(request.data.auth_crap.workstation,
  90                           user_info->wksta_name.str);
  91
  92         memcpy(request.data.auth_crap.chal, auth_context->challenge.data, sizeof(request.data.auth_crap.chal));
  93
  94         request.data.auth_crap.lm_resp_len = MIN(user_info->lm_resp.length,
  95                                                  sizeof(request.data.auth_crap.lm_resp));
  96         request.data.auth_crap.nt_resp_len = MIN(user_info->nt_resp.length,
  97                                                  sizeof(request.data.auth_crap.nt_resp));
  98
  99         memcpy(request.data.auth_crap.lm_resp, user_info->lm_resp.data,
 100                request.data.auth_crap.lm_resp_len);
 101         memcpy(request.data.auth_crap.nt_resp, user_info->nt_resp.data,
 102                request.data.auth_crap.nt_resp_len);
 103
 104         result = winbindd_request(WINBINDD_PAM_AUTH_CRAP, &request, &response);
 105
 106         if ( result == NSS_STATUS_UNAVAIL )  {
 107                 struct auth_methods *auth_method = my_private_data;
 108
 109                 if ( auth_method )
 110                         return auth_method->auth(auth_context, auth_method->private_data,
 111                                 mem_ctx, user_info, server_info);
 112                 else
 113                         /* log an error since this should not happen */
 114                         DEBUG(0,("check_winbind_security: ERROR!  my_private_data == NULL!\n"));
 115         }
 116
 117         nt_status = NT_STATUS(response.data.auth.nt_status);
 118
 119         if (result == NSS_STATUS_SUCCESS && response.extra_data) {
 120                 if (NT_STATUS_IS_OK(nt_status)) {
 121                         if (NT_STATUS_IS_OK(nt_status = get_info3_from_ndr(mem_ctx, &response, &info3))) {
 122                                 nt_status =
 123                                         make_server_info_info3(mem_ctx,
 124                                                                user_info->internal_username.str,
 125                                                                user_info->smb_name.str,
 126                                                                user_info->domain.str,
 127                                                                server_info,
 128                                                                &info3);
 129                         }
 130                 }
 131         } else if (NT_STATUS_IS_OK(nt_status)) {
 132                 nt_status = NT_STATUS_UNSUCCESSFUL;
 133         }
 134
 135         return nt_status;
 136 }
 137
 138 /* module initialisation */
 139 NTSTATUS auth_init_winbind(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 140 {
 141         if (!make_auth_methods(auth_context, auth_method)) {
 142                 return NT_STATUS_NO_MEMORY;
 143         }
 144
 145         (*auth_method)->name = "winbind";
 146         (*auth_method)->auth = check_winbind_security;
 147
 148         if (param && *param) {
 149                 /* we load the 'fallback' module - if winbind isn't here, call this
 150                    module */
 151                 if (!load_auth_module(auth_context, param, (auth_methods **)&(*auth_method)->private_data)) {
 152                         return NT_STATUS_UNSUCCESSFUL;
 153                 }
 154
 155         }
 156         return NT_STATUS_OK;
 157 }
 158
 159 NTSTATUS auth_winbind_init(void)
 160 {
 161         return smb_register_auth(AUTH_INTERFACE_VERSION, "winbind", auth_init_winbind);
 162 }