source: vendor/3.6.23/source3/auth/auth_unix.c

/* 
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Andrew Bartlett              2001

   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/>.
*/

#include "includes.h"
#include "auth.h"
#include "system/passwd.h"
#include "smbd/globals.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH

/** Check a plaintext username/password
 *
 * Cannot deal with an encrupted password in any manner whatsoever,
 * unless the account has a null password.
 **/

static NTSTATUS check_unix_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;
        struct passwd *pass = NULL;

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

        become_root();
        pass = Get_Pwnam_alloc(talloc_tos(), user_info->mapped.account_name);

        /** @todo This call assumes a ASCII password, no charset transformation is 
            done.  We may need to revisit this **/
        nt_status = pass_check(pass,
                                pass ? pass->pw_name : user_info->mapped.account_name,
                               smbd_server_conn->client_id.name,
                                user_info->password.plaintext,
                                true);

        unbecome_root();

        if (NT_STATUS_IS_OK(nt_status)) {
                if (pass) {
                        make_server_info_pw(server_info, pass->pw_name, pass);
                } else {
                        /* we need to do somthing more useful here */
                        nt_status = NT_STATUS_NO_SUCH_USER;
                }
        }

        TALLOC_FREE(pass);
        return nt_status;
}

/* module initialisation */
static NTSTATUS auth_init_unix(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 = "unix";
        result->auth = check_unix_security;

        *auth_method = result;
        return NT_STATUS_OK;
}

NTSTATUS auth_unix_init(void)
{
        return smb_register_auth(AUTH_INTERFACE_VERSION, "unix", auth_init_unix);
}