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