source: vendor/3.6.9/source3/auth/auth_wbc.c

/*
   Unix SMB/CIFS implementation.

   Winbind client authentication mechanism designed to defer all
   authentication to the winbind daemon.

   Copyright (C) Tim Potter 2000
   Copyright (C) Andrew Bartlett 2001 - 2002
   Copyright (C) Dan Sledz 2009

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/* This auth module is very similar to auth_winbind with 3 distinct
 * differences.
 *
 *      1) Does not fallback to another auth module if winbindd is unavailable
 *      2) Does not validate the domain of the user
 *      3) Handles unencrypted passwords
 *
 * The purpose of this module is to defer all authentication decisions (ie:
 * local user vs NIS vs LDAP vs AD; encrypted vs plaintext) to the wbc
 * compatible daemon.  This centeralizes all authentication decisions to a
 * single provider.
 *
 * This auth backend is most useful when used in conjunction with pdb_wbc_sam.
 */

#include "includes.h"
#include "auth.h"
#include "nsswitch/libwbclient/wbclient.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH

/* Authenticate a user with a challenge/response */

static NTSTATUS check_wbc_security(const struct auth_context *auth_context,
                                       void *my_private_data,
                                       TALLOC_CTX *mem_ctx,
                                       const struct auth_usersupplied_info *user_info,
                                       struct auth_serversupplied_info **server_info)
{
        NTSTATUS nt_status;
        wbcErr wbc_status;
        struct wbcAuthUserParams params;
        struct wbcAuthUserInfo *info = NULL;
        struct wbcAuthErrorInfo *err = NULL;

        if (!user_info || !auth_context || !server_info) {
                return NT_STATUS_INVALID_PARAMETER;
        }

        ZERO_STRUCT(params);

        /* Send off request */

        DEBUG(10, ("Check auth for: [%s]", user_info->mapped.account_name));

        params.account_name     = user_info->client.account_name;
        params.domain_name      = user_info->mapped.domain_name;
        params.workstation_name = user_info->workstation_name;

        params.flags            = 0;
        params.parameter_control= user_info->logon_parameters;

        /* Handle plaintext */
        switch (user_info->password_state) {
        case AUTH_PASSWORD_PLAIN:
        {
                DEBUG(3,("Checking plaintext password for %s.\n",
                         user_info->mapped.account_name));
                params.level = WBC_AUTH_USER_LEVEL_PLAIN;

                params.password.plaintext = user_info->password.plaintext;
                break;
        }
        case AUTH_PASSWORD_RESPONSE:
        case AUTH_PASSWORD_HASH:
        {
                DEBUG(3,("Checking encrypted password for %s.\n",
                         user_info->mapped.account_name));
                params.level = WBC_AUTH_USER_LEVEL_RESPONSE;

                memcpy(params.password.response.challenge,
                    auth_context->challenge.data,
                    sizeof(params.password.response.challenge));

                if (user_info->password.response.nt.length != 0) {
                        params.password.response.nt_length =
                                user_info->password.response.nt.length;
                        params.password.response.nt_data =
                                user_info->password.response.nt.data;
                }
                if (user_info->password.response.lanman.length != 0) {
                        params.password.response.lm_length =
                                user_info->password.response.lanman.length;
                        params.password.response.lm_data =
                                user_info->password.response.lanman.data;
                }
                break;
        }
        default:
                DEBUG(0,("user_info constructed for user '%s' was invalid - password_state=%u invalid.\n",user_info->mapped.account_name, user_info->password_state));
                return NT_STATUS_INTERNAL_ERROR;
#if 0 /* If ever implemented in libwbclient */
        case AUTH_PASSWORD_HASH:
        {
                DEBUG(3,("Checking logon (hash) password for %s.\n",
                         user_info->mapped.account_name));
                params.level = WBC_AUTH_USER_LEVEL_HASH;

                if (user_info->password.hash.nt) {
                        memcpy(params.password.hash.nt_hash, user_info->password.hash.nt, sizeof(* user_info->password.hash.nt));
                } else {
                        memset(params.password.hash.nt_hash, '\0', sizeof(params.password.hash.nt_hash));
                }

                if (user_info->password.hash.lanman) {
                        memcpy(params.password.hash.lm_hash, user_info->password.hash.lanman, sizeof(* user_info->password.hash.lanman));
                } else {
                        memset(params.password.hash.lm_hash, '\0', sizeof(params.password.hash.lm_hash));
                }

        }
#endif
        }

        /* we are contacting the privileged pipe */
        become_root();
        wbc_status = wbcAuthenticateUserEx(&params, &info, &err);
        unbecome_root();

        if (!WBC_ERROR_IS_OK(wbc_status)) {
                DEBUG(10,("wbcAuthenticateUserEx failed (%d): %s\n",
                        wbc_status, wbcErrorString(wbc_status)));
        }

        if (wbc_status == WBC_ERR_NO_MEMORY) {
                return NT_STATUS_NO_MEMORY;
        }

        if (wbc_status == WBC_ERR_AUTH_ERROR) {
                nt_status = NT_STATUS(err->nt_status);
                wbcFreeMemory(err);
                return nt_status;
        }

        if (!WBC_ERROR_IS_OK(wbc_status)) {
                return NT_STATUS_LOGON_FAILURE;
        }

        DEBUG(10,("wbcAuthenticateUserEx succeeded\n"));

        nt_status = make_server_info_wbcAuthUserInfo(mem_ctx,
                                                     user_info->client.account_name,
                                                     user_info->mapped.domain_name,
                                                     info, server_info);
        wbcFreeMemory(info);
        if (!NT_STATUS_IS_OK(nt_status)) {
                return nt_status;
        }

        (*server_info)->nss_token |= user_info->was_mapped;

        return nt_status;
}

/* module initialisation */
static NTSTATUS auth_init_wbc(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
{
        struct auth_methods *result;

        result = TALLOC_ZERO_P(auth_context, struct auth_methods);
        if (result == NULL) {
                return NT_STATUS_NO_MEMORY;
        }
        result->name = "wbc";
        result->auth = check_wbc_security;

        *auth_method = result;
        return NT_STATUS_OK;
}

NTSTATUS auth_wbc_init(void)
{
        return smb_register_auth(AUTH_INTERFACE_VERSION, "wbc", auth_init_wbc);
}