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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_AUTH
  27
  28 static NTSTATUS get_info3_from_ndr(TALLOC_CTX *mem_ctx, struct winbindd_response *response, NET_USER_INFO_3 *info3)
  29 {
  30         uint8 *info3_ndr;
  31         size_t len = response->length - sizeof(struct winbindd_response);
  32         prs_struct ps;
  33         if (len > 0) {
  34                 info3_ndr = (uint8 *)response->extra_data.data;
  35                 if (!prs_init(&ps, len, mem_ctx, UNMARSHALL)) {
  36                         return NT_STATUS_NO_MEMORY;
  37                 }
  38                 prs_copy_data_in(&ps, (char *)info3_ndr, len);
  39                 prs_set_offset(&ps,0);
  40                 if (!net_io_user_info3("", info3, &ps, 1, 3, False)) {
  41                         DEBUG(2, ("get_info3_from_ndr: could not parse info3 struct!\n"));
  42                         return NT_STATUS_UNSUCCESSFUL;
  43                 }
  44                 prs_mem_free(&ps);
  45
  46                 return NT_STATUS_OK;
  47         } else {
  48                 DEBUG(2, ("get_info3_from_ndr: No info3 struct found!\n"));
  49                 return NT_STATUS_UNSUCCESSFUL;
  50         }
  51 }
  52
  53 /* Authenticate a user with a challenge/response */
  54
  55 static NTSTATUS check_winbind_security(const struct auth_context *auth_context,
  56                                        void *my_private_data,
  57                                        TALLOC_CTX *mem_ctx,
  58                                        const auth_usersupplied_info *user_info,
  59                                        auth_serversupplied_info **server_info)
  60 {
  61         struct winbindd_request request;
  62         struct winbindd_response response;
  63         NSS_STATUS result;
  64         NTSTATUS nt_status;
  65         NET_USER_INFO_3 info3;
  66
  67         if (!user_info) {
  68                 return NT_STATUS_INVALID_PARAMETER;
  69         }
  70
  71         if (!auth_context) {
  72                 DEBUG(3,("Password for user %s cannot be checked because we have no auth_info to get the challenge from.\n",
  73                          user_info->internal_username));
  74                 return NT_STATUS_INVALID_PARAMETER;
  75         }
  76
  77         if (strequal(user_info->domain, get_global_sam_name())) {
  78                 DEBUG(3,("check_winbind_security: Not using winbind, requested domain [%s] was for this SAM.\n",
  79                         user_info->domain));
  80                 return NT_STATUS_NOT_IMPLEMENTED;
  81         }
  82
  83         /* Send off request */
  84
  85         ZERO_STRUCT(request);
  86         ZERO_STRUCT(response);
  87
  88         request.flags = WBFLAG_PAM_INFO3_NDR;
  89
  90         request.data.auth_crap.logon_parameters = user_info->logon_parameters;
  91
  92         fstrcpy(request.data.auth_crap.user, user_info->smb_name);
  93         fstrcpy(request.data.auth_crap.domain, user_info->domain);
  94         fstrcpy(request.data.auth_crap.workstation, user_info->wksta_name);
  95
  96         memcpy(request.data.auth_crap.chal, auth_context->challenge.data, sizeof(request.data.auth_crap.chal));
  97
  98         request.data.auth_crap.lm_resp_len = MIN(user_info->lm_resp.length,
  99                                                  sizeof(request.data.auth_crap.lm_resp));
 100         request.data.auth_crap.nt_resp_len = MIN(user_info->nt_resp.length,
 101                                                  sizeof(request.data.auth_crap.nt_resp));
 102
 103         memcpy(request.data.auth_crap.lm_resp, user_info->lm_resp.data,
 104                request.data.auth_crap.lm_resp_len);
 105         memcpy(request.data.auth_crap.nt_resp, user_info->nt_resp.data,
 106                request.data.auth_crap.nt_resp_len);
 107
 108         /* we are contacting the privileged pipe */
 109         become_root();
 110         result = winbindd_priv_request_response(WINBINDD_PAM_AUTH_CRAP,
 111                                                 &request, &response);
 112         unbecome_root();
 113
 114         if ( result == NSS_STATUS_UNAVAIL )  {
 115                 struct auth_methods *auth_method =
 116                         (struct auth_methods *)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.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->smb_name, user_info->domain,
 133                                         server_info, &info3);
 134                         }
 135
 136                         if (NT_STATUS_IS_OK(nt_status)) {
 137                                 if (user_info->was_mapped) {
 138                                         (*server_info)->was_mapped = user_info->was_mapped;
 139                                 }
 140                         }
 141                 }
 142         } else if (NT_STATUS_IS_OK(nt_status)) {
 143                 nt_status = NT_STATUS_NO_LOGON_SERVERS;
 144         }
 145
 146         SAFE_FREE(response.extra_data.data);
 147         return nt_status;
 148 }
 149
 150 /* module initialisation */
 151 static NTSTATUS auth_init_winbind(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 152 {
 153         if (!make_auth_methods(auth_context, auth_method)) {
 154                 return NT_STATUS_NO_MEMORY;
 155         }
 156
 157         (*auth_method)->name = "winbind";
 158         (*auth_method)->auth = check_winbind_security;
 159
 160         if (param && *param) {
 161                 /* we load the 'fallback' module - if winbind isn't here, call this
 162                    module */
 163                 auth_methods *priv;
 164                 if (!load_auth_module(auth_context, param, &priv)) {
 165                         return NT_STATUS_UNSUCCESSFUL;
 166                 }
 167                 (*auth_method)->private_data = (void *)priv;
 168         }
 169         return NT_STATUS_OK;
 170 }
 171
 172 NTSTATUS auth_winbind_init(void)
 173 {
 174         return smb_register_auth(AUTH_INTERFACE_VERSION, "winbind", auth_init_winbind);
 175 }