1/*
  2 * security/tomoyo/environ.c
  3 *
  4 * Copyright (C) 2005-2011  NTT DATA CORPORATION
  5 */
  6
  7#include "common.h"
  8
  9/**
 10 * tomoyo_check_env_acl - Check permission for environment variable's name.
 11 *
 12 * @r:   Pointer to "struct tomoyo_request_info".
 13 * @ptr: Pointer to "struct tomoyo_acl_info".
 14 *
 15 * Returns true if granted, false otherwise.
 16 */
 17static bool tomoyo_check_env_acl(struct tomoyo_request_info *r,
 18				 const struct tomoyo_acl_info *ptr)
 19{
 20	const struct tomoyo_env_acl *acl =
 21		container_of(ptr, typeof(*acl), head);
 22
 23	return tomoyo_path_matches_pattern(r->param.environ.name, acl->env);
 24}
 25
 26/**
 27 * tomoyo_audit_env_log - Audit environment variable name log.
 28 *
 29 * @r: Pointer to "struct tomoyo_request_info".
 30 *
 31 * Returns 0 on success, negative value otherwise.
 32 */
 33static int tomoyo_audit_env_log(struct tomoyo_request_info *r)
 34{
 35	return tomoyo_supervisor(r, "misc env %s\n",
 36				 r->param.environ.name->name);
 37}
 38
 39/**
 40 * tomoyo_env_perm - Check permission for environment variable's name.
 41 *
 42 * @r:   Pointer to "struct tomoyo_request_info".
 43 * @env: The name of environment variable.
 44 *
 45 * Returns 0 on success, negative value otherwise.
 46 *
 47 * Caller holds tomoyo_read_lock().
 48 */
 49int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env)
 50{
 51	struct tomoyo_path_info environ;
 52	int error;
 53
 54	if (!env || !*env)
 55		return 0;
 56	environ.name = env;
 57	tomoyo_fill_path_info(&environ);
 58	r->param_type = TOMOYO_TYPE_ENV_ACL;
 59	r->param.environ.name = &environ;
 60	do {
 61		tomoyo_check_acl(r, tomoyo_check_env_acl);
 62		error = tomoyo_audit_env_log(r);
 63	} while (error == TOMOYO_RETRY_REQUEST);
 64	return error;
 65}
 66
 67/**
 68 * tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry.
 69 *
 70 * @a: Pointer to "struct tomoyo_acl_info".
 71 * @b: Pointer to "struct tomoyo_acl_info".
 72 *
 73 * Returns true if @a == @b, false otherwise.
 74 */
 75static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a,
 76				const struct tomoyo_acl_info *b)
 77{
 78	const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head);
 79	const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head);
 80
 81	return p1->env == p2->env;
 82}
 83
 84/**
 85 * tomoyo_write_env - Write "struct tomoyo_env_acl" list.
 86 *
 87 * @param: Pointer to "struct tomoyo_acl_param".
 88 *
 89 * Returns 0 on success, negative value otherwise.
 90 *
 91 * Caller holds tomoyo_read_lock().
 92 */
 93static int tomoyo_write_env(struct tomoyo_acl_param *param)
 94{
 95	struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL };
 96	int error = -ENOMEM;
 97	const char *data = tomoyo_read_token(param);
 98
 99	if (!tomoyo_correct_word(data) || strchr(data, '='))
100		return -EINVAL;
101	e.env = tomoyo_get_name(data);
102	if (!e.env)
103		return error;
104	error = tomoyo_update_domain(&e.head, sizeof(e), param,
105				  tomoyo_same_env_acl, NULL);
106	tomoyo_put_name(e.env);
107	return error;
108}
109
110/**
111 * tomoyo_write_misc - Update environment variable list.
112 *
113 * @param: Pointer to "struct tomoyo_acl_param".
114 *
115 * Returns 0 on success, negative value otherwise.
116 */
117int tomoyo_write_misc(struct tomoyo_acl_param *param)
118{
119	if (tomoyo_str_starts(&param->data, "env "))
120		return tomoyo_write_env(param);
121	return -EINVAL;
122}

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * security/tomoyo/environ.c
  4 *
  5 * Copyright (C) 2005-2011  NTT DATA CORPORATION
  6 */
  7
  8#include "common.h"
  9
 10/**
 11 * tomoyo_check_env_acl - Check permission for environment variable's name.
 12 *
 13 * @r:   Pointer to "struct tomoyo_request_info".
 14 * @ptr: Pointer to "struct tomoyo_acl_info".
 15 *
 16 * Returns true if granted, false otherwise.
 17 */
 18static bool tomoyo_check_env_acl(struct tomoyo_request_info *r,
 19				 const struct tomoyo_acl_info *ptr)
 20{
 21	const struct tomoyo_env_acl *acl =
 22		container_of(ptr, typeof(*acl), head);
 23
 24	return tomoyo_path_matches_pattern(r->param.environ.name, acl->env);
 25}
 26
 27/**
 28 * tomoyo_audit_env_log - Audit environment variable name log.
 29 *
 30 * @r: Pointer to "struct tomoyo_request_info".
 31 *
 32 * Returns 0 on success, negative value otherwise.
 33 */
 34static int tomoyo_audit_env_log(struct tomoyo_request_info *r)
 35{
 36	return tomoyo_supervisor(r, "misc env %s\n",
 37				 r->param.environ.name->name);
 38}
 39
 40/**
 41 * tomoyo_env_perm - Check permission for environment variable's name.
 42 *
 43 * @r:   Pointer to "struct tomoyo_request_info".
 44 * @env: The name of environment variable.
 45 *
 46 * Returns 0 on success, negative value otherwise.
 47 *
 48 * Caller holds tomoyo_read_lock().
 49 */
 50int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env)
 51{
 52	struct tomoyo_path_info environ;
 53	int error;
 54
 55	if (!env || !*env)
 56		return 0;
 57	environ.name = env;
 58	tomoyo_fill_path_info(&environ);
 59	r->param_type = TOMOYO_TYPE_ENV_ACL;
 60	r->param.environ.name = &environ;
 61	do {
 62		tomoyo_check_acl(r, tomoyo_check_env_acl);
 63		error = tomoyo_audit_env_log(r);
 64	} while (error == TOMOYO_RETRY_REQUEST);
 65	return error;
 66}
 67
 68/**
 69 * tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry.
 70 *
 71 * @a: Pointer to "struct tomoyo_acl_info".
 72 * @b: Pointer to "struct tomoyo_acl_info".
 73 *
 74 * Returns true if @a == @b, false otherwise.
 75 */
 76static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a,
 77				const struct tomoyo_acl_info *b)
 78{
 79	const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head);
 80	const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head);
 81
 82	return p1->env == p2->env;
 83}
 84
 85/**
 86 * tomoyo_write_env - Write "struct tomoyo_env_acl" list.
 87 *
 88 * @param: Pointer to "struct tomoyo_acl_param".
 89 *
 90 * Returns 0 on success, negative value otherwise.
 91 *
 92 * Caller holds tomoyo_read_lock().
 93 */
 94static int tomoyo_write_env(struct tomoyo_acl_param *param)
 95{
 96	struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL };
 97	int error = -ENOMEM;
 98	const char *data = tomoyo_read_token(param);
 99
100	if (!tomoyo_correct_word(data) || strchr(data, '='))
101		return -EINVAL;
102	e.env = tomoyo_get_name(data);
103	if (!e.env)
104		return error;
105	error = tomoyo_update_domain(&e.head, sizeof(e), param,
106				  tomoyo_same_env_acl, NULL);
107	tomoyo_put_name(e.env);
108	return error;
109}
110
111/**
112 * tomoyo_write_misc - Update environment variable list.
113 *
114 * @param: Pointer to "struct tomoyo_acl_param".
115 *
116 * Returns 0 on success, negative value otherwise.
117 */
118int tomoyo_write_misc(struct tomoyo_acl_param *param)
119{
120	if (tomoyo_str_starts(&param->data, "env "))
121		return tomoyo_write_env(param);
122	return -EINVAL;
123}