source3/auth/auth_wbc.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind client authentication mechanism designed to defer all
   5    authentication to the winbind daemon.
   6
   7    Copyright (C) Tim Potter 2000
   8    Copyright (C) Andrew Bartlett 2001 - 2002
   9    Copyright (C) Dan Sledz 2009
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 /* This auth module is very similar to auth_winbind with 3 distinct
  26  * differences.
  27  *
  28  *      1) Does not fallback to another auth module if winbindd is unavailable
  29  *      2) Does not validate the domain of the user
  30  *      3) Handles unencrypted passwords
  31  *
  32  * The purpose of this module is to defer all authentication decisions (ie:
  33  * local user vs NIS vs LDAP vs AD; encrypted vs plaintext) to the wbc
  34  * compatible daemon.  This centeralizes all authentication decisions to a
  35  * single provider.
  36  *
  37  * This auth backend is most useful when used in conjunction with pdb_wbc_sam.
  38  */
  39
  40 #include "includes.h"
  41 #include "auth.h"
  42 #include "nsswitch/libwbclient/wbclient.h"
  43
  44 #undef DBGC_CLASS
  45 #define DBGC_CLASS DBGC_AUTH
  46
  47 /* Authenticate a user with a challenge/response */
  48
  49 static NTSTATUS check_wbc_security(const struct auth_context *auth_context,
  50                                        void *my_private_data,
  51                                        TALLOC_CTX *mem_ctx,
  52                                        const struct auth_usersupplied_info *user_info,
  53                                        struct auth_serversupplied_info **server_info)
  54 {
  55         NTSTATUS nt_status;
  56         wbcErr wbc_status;
  57         struct wbcAuthUserParams params;
  58         struct wbcAuthUserInfo *info = NULL;
  59         struct wbcAuthErrorInfo *err = NULL;
  60
  61         if (!user_info || !auth_context || !server_info) {
  62                 return NT_STATUS_INVALID_PARAMETER;
  63         }
  64
  65         ZERO_STRUCT(params);
  66
  67         /* Send off request */
  68
  69         DEBUG(10, ("Check auth for: [%s]", user_info->mapped.account_name));
  70
  71         params.account_name     = user_info->client.account_name;
  72         params.domain_name      = user_info->mapped.domain_name;
  73         params.workstation_name = user_info->workstation_name;
  74
  75         params.flags            = 0;
  76         params.parameter_control= user_info->logon_parameters;
  77
  78         /* Handle plaintext */
  79         switch (user_info->password_state) {
  80         case AUTH_PASSWORD_PLAIN:
  81         {
  82                 DEBUG(3,("Checking plaintext password for %s.\n",
  83                          user_info->mapped.account_name));
  84                 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
  85
  86                 params.password.plaintext = user_info->password.plaintext;
  87                 break;
  88         }
  89         case AUTH_PASSWORD_RESPONSE:
  90         case AUTH_PASSWORD_HASH:
  91         {
  92                 DEBUG(3,("Checking encrypted password for %s.\n",
  93                          user_info->mapped.account_name));
  94                 params.level = WBC_AUTH_USER_LEVEL_RESPONSE;
  95
  96                 memcpy(params.password.response.challenge,
  97                     auth_context->challenge.data,
  98                     sizeof(params.password.response.challenge));
  99
 100                 if (user_info->password.response.nt.length != 0) {
 101                         params.password.response.nt_length =
 102                                 user_info->password.response.nt.length;
 103                         params.password.response.nt_data =
 104                                 user_info->password.response.nt.data;
 105                 }
 106                 if (user_info->password.response.lanman.length != 0) {
 107                         params.password.response.lm_length =
 108                                 user_info->password.response.lanman.length;
 109                         params.password.response.lm_data =
 110                                 user_info->password.response.lanman.data;
 111                 }
 112                 break;
 113         }
 114         default:
 115                 DEBUG(0,("user_info constructed for user '%s' was invalid - password_state=%u invalid.\n",user_info->mapped.account_name, user_info->password_state));
 116                 return NT_STATUS_INTERNAL_ERROR;
 117 #if 0 /* If ever implemented in libwbclient */
 118         case AUTH_PASSWORD_HASH:
 119         {
 120                 DEBUG(3,("Checking logon (hash) password for %s.\n",
 121                          user_info->mapped.account_name));
 122                 params.level = WBC_AUTH_USER_LEVEL_HASH;
 123
 124                 if (user_info->password.hash.nt) {
 125                         memcpy(params.password.hash.nt_hash, user_info->password.hash.nt, sizeof(* user_info->password.hash.nt));
 126                 } else {
 127                         memset(params.password.hash.nt_hash, '\0', sizeof(params.password.hash.nt_hash));
 128                 }
 129
 130                 if (user_info->password.hash.lanman) {
 131                         memcpy(params.password.hash.lm_hash, user_info->password.hash.lanman, sizeof(* user_info->password.hash.lanman));
 132                 } else {
 133                         memset(params.password.hash.lm_hash, '\0', sizeof(params.password.hash.lm_hash));
 134                 }
 135
 136         }
 137 #endif
 138         }
 139
 140         /* we are contacting the privileged pipe */
 141         become_root();
 142         wbc_status = wbcAuthenticateUserEx(&params, &info, &err);
 143         unbecome_root();
 144
 145         if (!WBC_ERROR_IS_OK(wbc_status)) {
 146                 DEBUG(10,("wbcAuthenticateUserEx failed (%d): %s\n",
 147                         wbc_status, wbcErrorString(wbc_status)));
 148         }
 149
 150         if (wbc_status == WBC_ERR_NO_MEMORY) {
 151                 return NT_STATUS_NO_MEMORY;
 152         }
 153
 154         if (wbc_status == WBC_ERR_AUTH_ERROR) {
 155                 nt_status = NT_STATUS(err->nt_status);
 156                 wbcFreeMemory(err);
 157                 return nt_status;
 158         }
 159
 160         if (!WBC_ERROR_IS_OK(wbc_status)) {
 161                 return NT_STATUS_LOGON_FAILURE;
 162         }
 163
 164         DEBUG(10,("wbcAuthenticateUserEx succeeded\n"));
 165
 166         nt_status = make_server_info_wbcAuthUserInfo(mem_ctx,
 167                                                      user_info->client.account_name,
 168                                                      user_info->mapped.domain_name,
 169                                                      info, server_info);
 170         wbcFreeMemory(info);
 171         if (!NT_STATUS_IS_OK(nt_status)) {
 172                 return nt_status;
 173         }
 174
 175         (*server_info)->nss_token |= user_info->was_mapped;
 176
 177         return nt_status;
 178 }
 179
 180 /* module initialisation */
 181 static NTSTATUS auth_init_wbc(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 182 {
 183         struct auth_methods *result;
 184
 185         result = talloc_zero(auth_context, struct auth_methods);
 186         if (result == NULL) {
 187                 return NT_STATUS_NO_MEMORY;
 188         }
 189         result->name = "wbc";
 190         result->auth = check_wbc_security;
 191
 192         *auth_method = result;
 193         return NT_STATUS_OK;
 194 }
 195
 196 NTSTATUS auth_wbc_init(void)
 197 {
 198         return smb_register_auth(AUTH_INTERFACE_VERSION, "wbc", auth_init_wbc);
 199 }