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/*
Unix SMB/CIFS implementation.
Generic authenticaion types
Copyright (C) Andrew Bartlett 2001-2002
Copyright (C) Jelmer Vernooij 2002
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/**
* Return a guest logon for guest users (username = "")
*
* Typically used as the first module in the auth chain, this allows
* guest logons to be dealt with in one place. Non-guest logons 'fail'
* and pass onto the next module.
**/
static NTSTATUS check_guest_security(const struct auth_context *auth_context,
void *my_private_data,
TALLOC_CTX *mem_ctx,
const auth_usersupplied_info *user_info,
auth_serversupplied_info **server_info)
{
NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
if (!(user_info->internal_username.str
&& *user_info->internal_username.str)) {
nt_status = make_server_info_guest(server_info);
}
return nt_status;
}
/* Guest modules initialisation */
NTSTATUS auth_init_guest(struct auth_context *auth_context, const char *options, auth_methods **auth_method)
{
if (!make_auth_methods(auth_context, auth_method))
return NT_STATUS_NO_MEMORY;
(*auth_method)->auth = check_guest_security;
(*auth_method)->name = "guest";
return NT_STATUS_OK;
}
/**
* Return an error based on username
*
* This function allows the testing of obsure errors, as well as the generation
* of NT_STATUS -> DOS error mapping tables.
*
* This module is of no value to end-users.
*
* The password is ignored.
*
* @return An NTSTATUS value based on the username
**/
static NTSTATUS check_name_to_ntstatus_security(const struct auth_context *auth_context,
void *my_private_data,
TALLOC_CTX *mem_ctx,
const auth_usersupplied_info *user_info,
auth_serversupplied_info **server_info)
{
NTSTATUS nt_status;
fstring user;
long error_num;
fstrcpy(user, user_info->smb_name.str);
if (strncasecmp("NT_STATUS", user, strlen("NT_STATUS")) == 0) {
strupper(user);
return nt_status_string_to_code(user);
}
strlower(user);
error_num = strtoul(user, NULL, 16);
DEBUG(5,("check_name_to_ntstatus_security: Error for user %s was %lx\n", user, error_num));
nt_status = NT_STATUS(error_num);
return nt_status;
}
/** Module initailisation function */
NTSTATUS auth_init_name_to_ntstatus(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
{
if (!make_auth_methods(auth_context, auth_method))
return NT_STATUS_NO_MEMORY;
(*auth_method)->auth = check_name_to_ntstatus_security;
(*auth_method)->name = "name_to_ntstatus";
return NT_STATUS_OK;
}
/**
* Return a 'fixed' challenge instead of a varaible one.
*
* The idea of this function is to make packet snifs consistant
* with a fixed challenge, so as to aid debugging.
*
* This module is of no value to end-users.
*
* This module does not actually authenticate the user, but
* just pretenteds to need a specified challenge.
* This module removes *all* security from the challenge-response system
*
* @return NT_STATUS_UNSUCCESSFUL
**/
static NTSTATUS check_fixed_challenge_security(const struct auth_context *auth_context,
void *my_private_data,
TALLOC_CTX *mem_ctx,
const auth_usersupplied_info *user_info,
auth_serversupplied_info **server_info)
{
return NT_STATUS_UNSUCCESSFUL;
}
/****************************************************************************
Get the challenge out of a password server.
****************************************************************************/
static DATA_BLOB auth_get_fixed_challenge(const struct auth_context *auth_context,
void **my_private_data,
TALLOC_CTX *mem_ctx)
{
const char *challenge = "I am a teapot";
return data_blob(challenge, 8);
}
/** Module initailisation function */
NTSTATUS auth_init_fixed_challenge(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
{
if (!make_auth_methods(auth_context, auth_method))
return NT_STATUS_NO_MEMORY;
(*auth_method)->auth = check_fixed_challenge_security;
(*auth_method)->get_chal = auth_get_fixed_challenge;
(*auth_method)->name = "fixed_challenge";
return NT_STATUS_OK;
}
/**
* Outsorce an auth module to an external loadable .so
*
* Only works on systems with dlopen() etc.
**/
/* Plugin modules initialisation */
NTSTATUS auth_init_plugin(struct auth_context *auth_context, const char *param, auth_methods **auth_method)
{
void * dl_handle;
char *plugin_param, *plugin_name, *p;
auth_init_function plugin_init;
if (param == NULL) {
DEBUG(0, ("auth_init_plugin: The plugin module needs an argument!\n"));
return NT_STATUS_UNSUCCESSFUL;
}
plugin_name = smb_xstrdup(param);
p = strchr(plugin_name, ':');
if (p) {
*p = 0;
plugin_param = p+1;
trim_string(plugin_param, " ", " ");
} else plugin_param = NULL;
trim_string(plugin_name, " ", " ");
DEBUG(5, ("auth_init_plugin: Trying to load auth plugin %s\n", plugin_name));
dl_handle = sys_dlopen(plugin_name, RTLD_NOW );
if (!dl_handle) {
DEBUG(0, ("auth_init_plugin: Failed to load auth plugin %s using sys_dlopen (%s)\n",
plugin_name, sys_dlerror()));
return NT_STATUS_UNSUCCESSFUL;
}
plugin_init = (auth_init_function)sys_dlsym(dl_handle, "auth_init");
if (!plugin_init){
DEBUG(0, ("Failed to find function 'auth_init' using sys_dlsym in sam plugin %s (%s)\n",
plugin_name, sys_dlerror()));
return NT_STATUS_UNSUCCESSFUL;
}
DEBUG(5, ("Starting sam plugin %s with paramater %s\n", plugin_name, plugin_param?plugin_param:"(null)"));
return plugin_init(auth_context, plugin_param, auth_method);
}
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