124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* security/tomoyo/environ.c
|
|
*
|
|
* Copyright (C) 2005-2011 NTT DATA CORPORATION
|
|
*/
|
|
|
|
#include "common.h"
|
|
|
|
/**
|
|
* tomoyo_check_env_acl - Check permission for environment variable's name.
|
|
*
|
|
* @r: Pointer to "struct tomoyo_request_info".
|
|
* @ptr: Pointer to "struct tomoyo_acl_info".
|
|
*
|
|
* Returns true if granted, false otherwise.
|
|
*/
|
|
static bool tomoyo_check_env_acl(struct tomoyo_request_info *r,
|
|
const struct tomoyo_acl_info *ptr)
|
|
{
|
|
const struct tomoyo_env_acl *acl =
|
|
container_of(ptr, typeof(*acl), head);
|
|
|
|
return tomoyo_path_matches_pattern(r->param.environ.name, acl->env);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_audit_env_log - Audit environment variable name log.
|
|
*
|
|
* @r: Pointer to "struct tomoyo_request_info".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
static int tomoyo_audit_env_log(struct tomoyo_request_info *r)
|
|
{
|
|
return tomoyo_supervisor(r, "misc env %s\n",
|
|
r->param.environ.name->name);
|
|
}
|
|
|
|
/**
|
|
* tomoyo_env_perm - Check permission for environment variable's name.
|
|
*
|
|
* @r: Pointer to "struct tomoyo_request_info".
|
|
* @env: The name of environment variable.
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
int tomoyo_env_perm(struct tomoyo_request_info *r, const char *env)
|
|
{
|
|
struct tomoyo_path_info environ;
|
|
int error;
|
|
|
|
if (!env || !*env)
|
|
return 0;
|
|
environ.name = env;
|
|
tomoyo_fill_path_info(&environ);
|
|
r->param_type = TOMOYO_TYPE_ENV_ACL;
|
|
r->param.environ.name = &environ;
|
|
do {
|
|
tomoyo_check_acl(r, tomoyo_check_env_acl);
|
|
error = tomoyo_audit_env_log(r);
|
|
} while (error == TOMOYO_RETRY_REQUEST);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_same_env_acl - Check for duplicated "struct tomoyo_env_acl" entry.
|
|
*
|
|
* @a: Pointer to "struct tomoyo_acl_info".
|
|
* @b: Pointer to "struct tomoyo_acl_info".
|
|
*
|
|
* Returns true if @a == @b, false otherwise.
|
|
*/
|
|
static bool tomoyo_same_env_acl(const struct tomoyo_acl_info *a,
|
|
const struct tomoyo_acl_info *b)
|
|
{
|
|
const struct tomoyo_env_acl *p1 = container_of(a, typeof(*p1), head);
|
|
const struct tomoyo_env_acl *p2 = container_of(b, typeof(*p2), head);
|
|
|
|
return p1->env == p2->env;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_env - Write "struct tomoyo_env_acl" list.
|
|
*
|
|
* @param: Pointer to "struct tomoyo_acl_param".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*
|
|
* Caller holds tomoyo_read_lock().
|
|
*/
|
|
static int tomoyo_write_env(struct tomoyo_acl_param *param)
|
|
{
|
|
struct tomoyo_env_acl e = { .head.type = TOMOYO_TYPE_ENV_ACL };
|
|
int error = -ENOMEM;
|
|
const char *data = tomoyo_read_token(param);
|
|
|
|
if (!tomoyo_correct_word(data) || strchr(data, '='))
|
|
return -EINVAL;
|
|
e.env = tomoyo_get_name(data);
|
|
if (!e.env)
|
|
return error;
|
|
error = tomoyo_update_domain(&e.head, sizeof(e), param,
|
|
tomoyo_same_env_acl, NULL);
|
|
tomoyo_put_name(e.env);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* tomoyo_write_misc - Update environment variable list.
|
|
*
|
|
* @param: Pointer to "struct tomoyo_acl_param".
|
|
*
|
|
* Returns 0 on success, negative value otherwise.
|
|
*/
|
|
int tomoyo_write_misc(struct tomoyo_acl_param *param)
|
|
{
|
|
if (tomoyo_str_starts(¶m->data, "env "))
|
|
return tomoyo_write_env(param);
|
|
return -EINVAL;
|
|
}
|