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(struct winbindd_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, (char *)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_INVALID_PARAMETER;
  76         }
  77
  78         if (strequal(user_info->domain.str, get_global_sam_name())) {
  79                 DEBUG(3,("check_winbind_security: Not using winbind, requested domain [%s] was for this SAM.\n",
  80                         user_info->domain.str));
  81                 return NT_STATUS_NOT_IMPLEMENTED;
  82         }
  83
  84         /* Send off request */
  85
  86         ZERO_STRUCT(request);
  87         ZERO_STRUCT(response);
  88
  89         request.flags = WBFLAG_PAM_INFO3_NDR;
  90
  91         fstrcpy(request.data.auth_crap.user,
  92                           user_info->smb_name.str);
  93         fstrcpy(request.data.auth_crap.domain,
  94                           user_info->domain.str);
  95         fstrcpy(request.data.auth_crap.workstation,
  96                           user_info->wksta_name.str);
  97
  98         memcpy(request.data.auth_crap.chal, auth_context->challenge.data, sizeof(request.data.auth_crap.chal));
  99
 100         request.data.auth_crap.lm_resp_len = MIN(user_info->lm_resp.length,
 101                                                  sizeof(request.data.auth_crap.lm_resp));
 102         request.data.auth_crap.nt_resp_len = MIN(user_info->nt_resp.length,
 103                                                  sizeof(request.data.auth_crap.nt_resp));
 104
 105         memcpy(request.data.auth_crap.lm_resp, user_info->lm_resp.data,
 106                request.data.auth_crap.lm_resp_len);
 107         memcpy(request.data.auth_crap.nt_resp, user_info->nt_resp.data,
 108                request.data.auth_crap.nt_resp_len);
 109
 110         /* we are contacting the privileged pipe */
 111         become_root();
 112         result = winbindd_request_response(WINBINDD_PAM_AUTH_CRAP, &request, &response);
 113         unbecome_root();
 114
 115         if ( result == NSS_STATUS_UNAVAIL )  {
 116                 struct auth_methods *auth_method = my_private_data;
 117
 118                 if ( auth_method )
 119                         return auth_method->auth(auth_context, auth_method->private_data,
 120                                 mem_ctx, user_info, server_info);
 121                 else
 122                         /* log an error since this should not happen */
 123                         DEBUG(0,("check_winbind_security: ERROR!  my_private_data == NULL!\n"));
 124         }
 125
 126         nt_status = NT_STATUS(response.data.auth.nt_status);
 127
 128         if (result == NSS_STATUS_SUCCESS && response.extra_data) {
 129                 if (NT_STATUS_IS_OK(nt_status)) {
 130                         if (NT_STATUS_IS_OK(nt_status = get_info3_from_ndr(mem_ctx, &response, &info3))) {
 131                                 nt_status = make_server_info_info3(mem_ctx,
 132                                         user_info->internal_username.str,
 133                                         user_info->smb_name.str, user_info->domain.str,
 134                                         server_info, &info3);
 135                         }
 136
 137                 }
 138         } else if (NT_STATUS_IS_OK(nt_status)) {
 139                 nt_status = NT_STATUS_NO_LOGON_SERVERS;
 140         }
 141
 142         SAFE_FREE(response.extra_data);
 143         return nt_status;
 144 }
 145
 146 /* module initialisation */
 147 static NTSTATUS auth_init_winbind(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 148 {
 149         if (!make_auth_methods(auth_context, auth_method)) {
 150                 return NT_STATUS_NO_MEMORY;
 151         }
 152
 153         (*auth_method)->name = "winbind";
 154         (*auth_method)->auth = check_winbind_security;
 155
 156         if (param && *param) {
 157                 /* we load the 'fallback' module - if winbind isn't here, call this
 158                    module */
 159                 if (!load_auth_module(auth_context, param, (auth_methods **)&(*auth_method)->private_data)) {
 160                         return NT_STATUS_UNSUCCESSFUL;
 161                 }
 162
 163         }
 164         return NT_STATUS_OK;
 165 }
 166
 167 NTSTATUS auth_winbind_init(void)
 168 {
 169         return smb_register_auth(AUTH_INTERFACE_VERSION, "winbind", auth_init_winbind);
 170 }