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
  42 #undef DBGC_CLASS
  43 #define DBGC_CLASS DBGC_AUTH
  44
  45 /* Authenticate a user with a challenge/response */
  46
  47 static NTSTATUS check_wbc_security(const struct auth_context *auth_context,
  48                                        void *my_private_data,
  49                                        TALLOC_CTX *mem_ctx,
  50                                        const struct auth_usersupplied_info *user_info,
  51                                        struct auth_serversupplied_info **server_info)
  52 {
  53         NTSTATUS nt_status;
  54         wbcErr wbc_status;
  55         struct wbcAuthUserParams params;
  56         struct wbcAuthUserInfo *info = NULL;
  57         struct wbcAuthErrorInfo *err = NULL;
  58
  59         if (!user_info || !auth_context || !server_info) {
  60                 return NT_STATUS_INVALID_PARAMETER;
  61         }
  62         /* Send off request */
  63
  64         DEBUG(10, ("Check auth for: [%s]", user_info->internal_username));
  65
  66         params.account_name     = user_info->smb_name;
  67         params.domain_name      = user_info->domain;
  68         params.workstation_name = user_info->wksta_name;
  69
  70         params.flags            = 0;
  71         params.parameter_control= user_info->logon_parameters;
  72
  73         /* Handle plaintext */
  74         if (!user_info->encrypted) {
  75                 DEBUG(3,("Checking plaintext password for %s.\n",
  76                          user_info->internal_username));
  77                 params.level = WBC_AUTH_USER_LEVEL_PLAIN;
  78
  79                 params.password.plaintext = (char *)user_info->plaintext_password.data;
  80         } else {
  81                 DEBUG(3,("Checking encrypted password for %s.\n",
  82                          user_info->internal_username));
  83                 params.level = WBC_AUTH_USER_LEVEL_RESPONSE;
  84
  85                 memcpy(params.password.response.challenge,
  86                     auth_context->challenge.data,
  87                     sizeof(params.password.response.challenge));
  88
  89                 params.password.response.nt_length = user_info->nt_resp.length;
  90                 params.password.response.nt_data = user_info->nt_resp.data;
  91                 params.password.response.lm_length = user_info->lm_resp.length;
  92                 params.password.response.lm_data = user_info->lm_resp.data;
  93
  94         }
  95
  96         /* we are contacting the privileged pipe */
  97         become_root();
  98         wbc_status = wbcAuthenticateUserEx(&params, &info, &err);
  99         unbecome_root();
 100
 101         if (!WBC_ERROR_IS_OK(wbc_status)) {
 102                 DEBUG(10,("wbcAuthenticateUserEx failed (%d): %s\n",
 103                         wbc_status, wbcErrorString(wbc_status)));
 104         }
 105
 106         if (wbc_status == WBC_ERR_NO_MEMORY) {
 107                 return NT_STATUS_NO_MEMORY;
 108         }
 109
 110         if (wbc_status == WBC_ERR_AUTH_ERROR) {
 111                 nt_status = NT_STATUS(err->nt_status);
 112                 wbcFreeMemory(err);
 113                 return nt_status;
 114         }
 115
 116         if (!WBC_ERROR_IS_OK(wbc_status)) {
 117                 return NT_STATUS_LOGON_FAILURE;
 118         }
 119
 120         DEBUG(10,("wbcAuthenticateUserEx succeeded\n"));
 121
 122         nt_status = make_server_info_wbcAuthUserInfo(mem_ctx,
 123                                                      user_info->smb_name,
 124                                                      user_info->domain,
 125                                                      info, server_info);
 126         wbcFreeMemory(info);
 127         if (!NT_STATUS_IS_OK(nt_status)) {
 128                 return nt_status;
 129         }
 130
 131         (*server_info)->nss_token |= user_info->was_mapped;
 132
 133         return nt_status;
 134 }
 135
 136 /* module initialisation */
 137 static NTSTATUS auth_init_wbc(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
 138 {
 139         struct auth_methods *result;
 140
 141         result = TALLOC_ZERO_P(auth_context, struct auth_methods);
 142         if (result == NULL) {
 143                 return NT_STATUS_NO_MEMORY;
 144         }
 145         result->name = "wbc";
 146         result->auth = check_wbc_security;
 147
 148         *auth_method = result;
 149         return NT_STATUS_OK;
 150 }
 151
 152 NTSTATUS auth_wbc_init(void)
 153 {
 154         return smb_register_auth(AUTH_INTERFACE_VERSION, "wbc", auth_init_wbc);
 155 }