// SPDX-License-Identifier: GPL-2.0
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/*
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* security/tomoyo/securityfs_if.c
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*
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* Copyright (C) 2005-2011 NTT DATA CORPORATION
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*/
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#include <linux/security.h>
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#include "common.h"
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/**
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* tomoyo_check_task_acl - Check permission for task operation.
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*
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* @r: Pointer to "struct tomoyo_request_info".
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* @ptr: Pointer to "struct tomoyo_acl_info".
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*
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* Returns true if granted, false otherwise.
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*/
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static bool tomoyo_check_task_acl(struct tomoyo_request_info *r,
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const struct tomoyo_acl_info *ptr)
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{
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const struct tomoyo_task_acl *acl = container_of(ptr, typeof(*acl),
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head);
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return !tomoyo_pathcmp(r->param.task.domainname, acl->domainname);
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}
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/**
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* tomoyo_write_self - write() for /sys/kernel/security/tomoyo/self_domain interface.
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*
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* @file: Pointer to "struct file".
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* @buf: Domainname to transit to.
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* @count: Size of @buf.
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* @ppos: Unused.
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*
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* Returns @count on success, negative value otherwise.
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*
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* If domain transition was permitted but the domain transition failed, this
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* function returns error rather than terminating current thread with SIGKILL.
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*/
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static ssize_t tomoyo_write_self(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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char *data;
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int error;
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if (!count || count >= TOMOYO_EXEC_TMPSIZE - 10)
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return -ENOMEM;
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data = memdup_user_nul(buf, count);
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if (IS_ERR(data))
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return PTR_ERR(data);
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tomoyo_normalize_line(data);
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if (tomoyo_correct_domain(data)) {
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const int idx = tomoyo_read_lock();
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struct tomoyo_path_info name;
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struct tomoyo_request_info r;
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name.name = data;
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tomoyo_fill_path_info(&name);
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/* Check "task manual_domain_transition" permission. */
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tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
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r.param_type = TOMOYO_TYPE_MANUAL_TASK_ACL;
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r.param.task.domainname = &name;
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tomoyo_check_acl(&r, tomoyo_check_task_acl);
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if (!r.granted)
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error = -EPERM;
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else {
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struct tomoyo_domain_info *new_domain =
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tomoyo_assign_domain(data, true);
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if (!new_domain) {
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error = -ENOENT;
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} else {
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struct tomoyo_task *s = tomoyo_task(current);
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struct tomoyo_domain_info *old_domain =
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s->domain_info;
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s->domain_info = new_domain;
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atomic_inc(&new_domain->users);
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atomic_dec(&old_domain->users);
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error = 0;
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}
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}
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tomoyo_read_unlock(idx);
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} else
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error = -EINVAL;
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kfree(data);
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return error ? error : count;
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}
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/**
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* tomoyo_read_self - read() for /sys/kernel/security/tomoyo/self_domain interface.
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*
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* @file: Pointer to "struct file".
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* @buf: Domainname which current thread belongs to.
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* @count: Size of @buf.
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* @ppos: Bytes read by now.
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*
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* Returns read size on success, negative value otherwise.
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*/
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static ssize_t tomoyo_read_self(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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const char *domain = tomoyo_domain()->domainname->name;
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loff_t len = strlen(domain);
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loff_t pos = *ppos;
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if (pos >= len || !count)
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return 0;
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len -= pos;
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if (count < len)
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len = count;
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if (copy_to_user(buf, domain + pos, len))
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return -EFAULT;
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*ppos += len;
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return len;
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}
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/* Operations for /sys/kernel/security/tomoyo/self_domain interface. */
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static const struct file_operations tomoyo_self_operations = {
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.write = tomoyo_write_self,
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.read = tomoyo_read_self,
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};
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/**
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* tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
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*
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* @inode: Pointer to "struct inode".
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* @file: Pointer to "struct file".
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*
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* Returns 0 on success, negative value otherwise.
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*/
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static int tomoyo_open(struct inode *inode, struct file *file)
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{
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const int key = ((u8 *) file_inode(file)->i_private)
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- ((u8 *) NULL);
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return tomoyo_open_control(key, file);
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}
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/**
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* tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
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*
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* @file: Pointer to "struct file".
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*
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*/
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static int tomoyo_release(struct inode *inode, struct file *file)
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{
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tomoyo_close_control(file->private_data);
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return 0;
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}
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/**
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* tomoyo_poll - poll() for /sys/kernel/security/tomoyo/ interface.
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*
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* @file: Pointer to "struct file".
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* @wait: Pointer to "poll_table". Maybe NULL.
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*
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* Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
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* EPOLLOUT | EPOLLWRNORM otherwise.
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*/
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static __poll_t tomoyo_poll(struct file *file, poll_table *wait)
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{
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return tomoyo_poll_control(file, wait);
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}
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/**
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* tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
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*
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* @file: Pointer to "struct file".
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* @buf: Pointer to buffer.
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* @count: Size of @buf.
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* @ppos: Unused.
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*
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* Returns bytes read on success, negative value otherwise.
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*/
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static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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return tomoyo_read_control(file->private_data, buf, count);
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}
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/**
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* tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
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*
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* @file: Pointer to "struct file".
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* @buf: Pointer to buffer.
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* @count: Size of @buf.
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* @ppos: Unused.
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*
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* Returns @count on success, negative value otherwise.
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*/
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static ssize_t tomoyo_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return tomoyo_write_control(file->private_data, buf, count);
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}
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/*
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* tomoyo_operations is a "struct file_operations" which is used for handling
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* /sys/kernel/security/tomoyo/ interface.
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*
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* Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
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* See tomoyo_io_buffer for internals.
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*/
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static const struct file_operations tomoyo_operations = {
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.open = tomoyo_open,
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.release = tomoyo_release,
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.poll = tomoyo_poll,
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.read = tomoyo_read,
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.write = tomoyo_write,
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.llseek = noop_llseek,
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};
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/**
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* tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
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*
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* @name: The name of the interface file.
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* @mode: The permission of the interface file.
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* @parent: The parent directory.
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* @key: Type of interface.
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*
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* Returns nothing.
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*/
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static void __init tomoyo_create_entry(const char *name, const umode_t mode,
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struct dentry *parent, const u8 key)
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{
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securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
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&tomoyo_operations);
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}
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/**
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* tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
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*
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* Returns 0.
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*/
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static int __init tomoyo_initerface_init(void)
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{
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struct tomoyo_domain_info *domain;
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struct dentry *tomoyo_dir;
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if (!tomoyo_enabled)
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return 0;
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domain = tomoyo_domain();
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/* Don't create securityfs entries unless registered. */
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if (domain != &tomoyo_kernel_domain)
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return 0;
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tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
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tomoyo_create_entry("query", 0600, tomoyo_dir,
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TOMOYO_QUERY);
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tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
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TOMOYO_DOMAINPOLICY);
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tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
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TOMOYO_EXCEPTIONPOLICY);
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tomoyo_create_entry("audit", 0400, tomoyo_dir,
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TOMOYO_AUDIT);
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tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
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TOMOYO_PROCESS_STATUS);
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tomoyo_create_entry("stat", 0644, tomoyo_dir,
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TOMOYO_STAT);
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tomoyo_create_entry("profile", 0600, tomoyo_dir,
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TOMOYO_PROFILE);
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tomoyo_create_entry("manager", 0600, tomoyo_dir,
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TOMOYO_MANAGER);
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tomoyo_create_entry("version", 0400, tomoyo_dir,
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TOMOYO_VERSION);
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securityfs_create_file("self_domain", 0666, tomoyo_dir, NULL,
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&tomoyo_self_operations);
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tomoyo_load_builtin_policy();
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return 0;
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}
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fs_initcall(tomoyo_initerface_init);
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