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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019-2020 Robert Manner <robert.manner@oneidentity.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include "python_plugin_common.h"
static struct PluginContext plugin_ctx;
extern struct policy_plugin python_policy;
#define PY_POLICY_PLUGIN_VERSION SUDO_API_MKVERSION(1, 0)
#define CALLBACK_PLUGINFUNC(func_name) python_policy.func_name
#define CALLBACK_CFUNC(func_name) python_plugin_policy_ ## func_name
// This also verifies compile time that the name matches the sudo plugin API.
#define CALLBACK_PYNAME(func_name) ((void)CALLBACK_PLUGINFUNC(func_name), #func_name)
#define MARK_CALLBACK_OPTIONAL(function_name) \
do { \
python_plugin_mark_callback_optional(&plugin_ctx, CALLBACK_PYNAME(function_name), \
(void **)&CALLBACK_PLUGINFUNC(function_name)); \
} while(0)
static int
python_plugin_policy_open(unsigned int version, sudo_conv_t conversation,
sudo_printf_t sudo_printf, char * const settings[],
char * const user_info[], char * const user_env[],
char * const plugin_options[], const char **errstr)
{
debug_decl(python_plugin_policy_open, PYTHON_DEBUG_CALLBACKS);
if (version < SUDO_API_MKVERSION(1, 2)) {
sudo_printf(SUDO_CONV_ERROR_MSG,
"Error: Python policy plugin requires at least plugin API version 1.2\n");
debug_return_int(SUDO_RC_ERROR);
}
int rc = python_plugin_register_logging(conversation, sudo_printf, settings);
if (rc != SUDO_RC_OK)
debug_return_int(rc);
rc = python_plugin_init(&plugin_ctx, plugin_options, version);
if (rc != SUDO_RC_OK)
debug_return_int(rc);
rc = python_plugin_construct(&plugin_ctx, PY_POLICY_PLUGIN_VERSION, settings,
user_info, user_env, plugin_options);
CALLBACK_SET_ERROR(&plugin_ctx, errstr);
if (rc != SUDO_RC_OK) {
debug_return_int(rc);
}
// skip plugin callbacks which are not mandatory
MARK_CALLBACK_OPTIONAL(list);
MARK_CALLBACK_OPTIONAL(validate);
MARK_CALLBACK_OPTIONAL(invalidate);
MARK_CALLBACK_OPTIONAL(init_session);
// check_policy, open and close are mandatory
debug_return_int(rc);
}
static void
python_plugin_policy_close(int exit_status, int error)
{
debug_decl(python_plugin_policy_close, PYTHON_DEBUG_CALLBACKS);
python_plugin_close(&plugin_ctx, CALLBACK_PYNAME(close),
Py_BuildValue("(ii)", error == 0 ? exit_status : -1, error));
debug_return;
}
static int
python_plugin_policy_check(int argc, char * const argv[],
char *env_add[], char **command_info_out[],
char **argv_out[], char **user_env_out[], const char **errstr)
{
debug_decl(python_plugin_policy_check, PYTHON_DEBUG_CALLBACKS);
int rc = SUDO_RC_ERROR;
PyThreadState_Swap(plugin_ctx.py_interpreter);
*command_info_out = *argv_out = *user_env_out = NULL;
PyObject *py_argv = py_str_array_to_tuple_with_count(argc, argv);
PyObject *py_env_add = py_str_array_to_tuple(env_add);
PyObject *py_result = NULL;
if (py_argv == NULL || py_env_add == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR, "Failed to create some of the arguments for the python call "
"(py_argv=%p py_env_add=%p)\n", (void *)py_argv, (void *)py_env_add);
goto cleanup;
}
py_result = python_plugin_api_call(&plugin_ctx, CALLBACK_PYNAME(check_policy),
Py_BuildValue("(OO)", py_argv, py_env_add));
CALLBACK_SET_ERROR(&plugin_ctx, errstr);
if (py_result == NULL)
goto cleanup;
PyObject *py_rc = NULL,
*py_command_info_out = NULL,
*py_argv_out = NULL,
*py_user_env_out = NULL;
if (PyTuple_Check(py_result))
{
if (!PyArg_ParseTuple(py_result, "O!|O!O!O!:python_plugin.check_policy",
&PyLong_Type, &py_rc,
&PyTuple_Type, &py_command_info_out,
&PyTuple_Type, &py_argv_out,
&PyTuple_Type, &py_user_env_out))
{
goto cleanup;
}
} else {
py_rc = py_result;
}
if (py_command_info_out != NULL)
*command_info_out = py_str_array_from_tuple(py_command_info_out);
if (py_argv_out != NULL)
*argv_out = py_str_array_from_tuple(py_argv_out);
if (py_user_env_out != NULL)
*user_env_out = py_str_array_from_tuple(py_user_env_out);
rc = python_plugin_rc_to_int(py_rc);
cleanup:
if (PyErr_Occurred()) {
py_log_last_error(NULL);
rc = SUDO_RC_ERROR;
free(*command_info_out);
free(*argv_out);
free(*user_env_out);
*command_info_out = *argv_out = *user_env_out = NULL;
}
Py_XDECREF(py_argv);
Py_XDECREF(py_env_add);
Py_XDECREF(py_result);
if (rc == SUDO_RC_ACCEPT)
plugin_ctx.call_close = 1;
debug_return_int(rc);
}
static int
python_plugin_policy_list(int argc, char * const argv[], int verbose, const char *list_user, const char **errstr)
{
debug_decl(python_plugin_policy_list, PYTHON_DEBUG_CALLBACKS);
PyThreadState_Swap(plugin_ctx.py_interpreter);
PyObject *py_argv = py_str_array_to_tuple_with_count(argc, argv);
if (py_argv == NULL) {
sudo_debug_printf(SUDO_DEBUG_ERROR, "%s: Failed to create argv argument for the python call\n", __func__);
debug_return_int(SUDO_RC_ERROR);
}
int rc = python_plugin_api_rc_call(&plugin_ctx, CALLBACK_PYNAME(list),
Py_BuildValue("(Oiz)", py_argv, verbose, list_user));
Py_XDECREF(py_argv);
CALLBACK_SET_ERROR(&plugin_ctx, errstr);
debug_return_int(rc);
}
static int
python_plugin_policy_version(int verbose)
{
debug_decl(python_plugin_policy_version, PYTHON_DEBUG_CALLBACKS);
PyThreadState_Swap(plugin_ctx.py_interpreter);
debug_return_int(python_plugin_show_version(&plugin_ctx, CALLBACK_PYNAME(show_version),
verbose, PY_POLICY_PLUGIN_VERSION, "policy"));
}
static int
python_plugin_policy_validate(const char **errstr)
{
debug_decl(python_plugin_policy_validate, PYTHON_DEBUG_CALLBACKS);
PyThreadState_Swap(plugin_ctx.py_interpreter);
int rc = python_plugin_api_rc_call(&plugin_ctx, CALLBACK_PYNAME(validate), NULL);
CALLBACK_SET_ERROR(&plugin_ctx, errstr);
debug_return_int(rc);
}
static void
python_plugin_policy_invalidate(int unlinkit)
{
debug_decl(python_plugin_policy_invalidate, PYTHON_DEBUG_CALLBACKS);
PyThreadState_Swap(plugin_ctx.py_interpreter);
python_plugin_api_rc_call(&plugin_ctx, CALLBACK_PYNAME(invalidate),
Py_BuildValue("(i)", unlinkit));
debug_return;
}
static int
python_plugin_policy_init_session(struct passwd *pwd, char **user_env[], const char **errstr)
{
debug_decl(python_plugin_policy_init_session, PYTHON_DEBUG_CALLBACKS);
int rc = SUDO_RC_ERROR;
PyThreadState_Swap(plugin_ctx.py_interpreter);
PyObject *py_pwd = NULL, *py_user_env = NULL, *py_result = NULL;
py_pwd = py_from_passwd(pwd);
if (py_pwd == NULL)
goto cleanup;
py_user_env = py_str_array_to_tuple(*user_env);
if (py_user_env == NULL)
goto cleanup;
py_result = python_plugin_api_call(&plugin_ctx, CALLBACK_PYNAME(init_session),
Py_BuildValue("(OO)", py_pwd, py_user_env));
CALLBACK_SET_ERROR(&plugin_ctx, errstr);
if (py_result == NULL)
goto cleanup;
PyObject *py_user_env_out = NULL, *py_rc = NULL;
if (PyTuple_Check(py_result)) {
if (!PyArg_ParseTuple(py_result, "O!|O!:python_plugin.init_session",
&PyLong_Type, &py_rc,
&PyTuple_Type, &py_user_env_out)) {
goto cleanup;
}
} else {
py_rc = py_result;
}
if (py_user_env_out != NULL) {
str_array_free(user_env);
*user_env = py_str_array_from_tuple(py_user_env_out);
if (*user_env == NULL)
goto cleanup;
}
rc = python_plugin_rc_to_int(py_rc);
cleanup:
Py_XDECREF(py_pwd);
Py_XDECREF(py_user_env);
Py_XDECREF(py_result);
debug_return_int(rc);
}
sudo_dso_public struct policy_plugin python_policy = {
SUDO_POLICY_PLUGIN,
SUDO_API_VERSION,
CALLBACK_CFUNC(open),
CALLBACK_CFUNC(close),
CALLBACK_CFUNC(version),
CALLBACK_CFUNC(check),
CALLBACK_CFUNC(list),
CALLBACK_CFUNC(validate),
CALLBACK_CFUNC(invalidate),
CALLBACK_CFUNC(init_session),
NULL, /* register_hooks */
NULL, /* deregister_hooks */
NULL /* event_alloc */
};
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