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1329 lines
28 KiB
1329 lines
28 KiB
/* Updated: Karl MacMillan <kmacmillan@tresys.com>
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*
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* Added conditional policy language extensions
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*
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* Copyright (C) 2003 - 2004 Tresys Technology, LLC
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* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/security.h>
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#include <linux/major.h>
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#include <linux/seq_file.h>
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#include <linux/percpu.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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/* selinuxfs pseudo filesystem for exporting the security policy API.
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Based on the proc code and the fs/nfsd/nfsctl.c code. */
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#include "flask.h"
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#include "avc.h"
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#include "avc_ss.h"
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#include "security.h"
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#include "objsec.h"
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#include "conditional.h"
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unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
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static int __init checkreqprot_setup(char *str)
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{
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selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
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return 1;
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}
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__setup("checkreqprot=", checkreqprot_setup);
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static DECLARE_MUTEX(sel_sem);
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/* global data for booleans */
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static struct dentry *bool_dir = NULL;
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static int bool_num = 0;
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static int *bool_pending_values = NULL;
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extern void selnl_notify_setenforce(int val);
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/* Check whether a task is allowed to use a security operation. */
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static int task_has_security(struct task_struct *tsk,
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u32 perms)
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{
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struct task_security_struct *tsec;
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tsec = tsk->security;
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if (!tsec)
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return -EACCES;
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return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
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SECCLASS_SECURITY, perms, NULL);
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}
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enum sel_inos {
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SEL_ROOT_INO = 2,
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SEL_LOAD, /* load policy */
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SEL_ENFORCE, /* get or set enforcing status */
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SEL_CONTEXT, /* validate context */
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SEL_ACCESS, /* compute access decision */
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SEL_CREATE, /* compute create labeling decision */
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SEL_RELABEL, /* compute relabeling decision */
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SEL_USER, /* compute reachable user contexts */
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SEL_POLICYVERS, /* return policy version for this kernel */
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SEL_COMMIT_BOOLS, /* commit new boolean values */
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SEL_MLS, /* return if MLS policy is enabled */
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SEL_DISABLE, /* disable SELinux until next reboot */
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SEL_AVC, /* AVC management directory */
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SEL_MEMBER, /* compute polyinstantiation membership decision */
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SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
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};
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#define TMPBUFLEN 12
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static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
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static ssize_t sel_write_enforce(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 *page;
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ssize_t length;
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int new_value;
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if (count >= PAGE_SIZE)
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return -ENOMEM;
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if (*ppos != 0) {
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/* No partial writes. */
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return -EINVAL;
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}
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page = (char*)get_zeroed_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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length = -EFAULT;
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if (copy_from_user(page, buf, count))
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goto out;
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length = -EINVAL;
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if (sscanf(page, "%d", &new_value) != 1)
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goto out;
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if (new_value != selinux_enforcing) {
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length = task_has_security(current, SECURITY__SETENFORCE);
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if (length)
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goto out;
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selinux_enforcing = new_value;
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if (selinux_enforcing)
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avc_ss_reset(0);
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selnl_notify_setenforce(selinux_enforcing);
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}
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length = count;
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out:
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free_page((unsigned long) page);
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return length;
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}
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#else
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#define sel_write_enforce NULL
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#endif
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static struct file_operations sel_enforce_ops = {
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.read = sel_read_enforce,
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.write = sel_write_enforce,
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};
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#ifdef CONFIG_SECURITY_SELINUX_DISABLE
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static ssize_t sel_write_disable(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 *page;
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ssize_t length;
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int new_value;
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extern int selinux_disable(void);
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if (count >= PAGE_SIZE)
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return -ENOMEM;
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if (*ppos != 0) {
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/* No partial writes. */
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return -EINVAL;
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}
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page = (char*)get_zeroed_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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length = -EFAULT;
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if (copy_from_user(page, buf, count))
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goto out;
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length = -EINVAL;
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if (sscanf(page, "%d", &new_value) != 1)
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goto out;
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if (new_value) {
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length = selinux_disable();
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if (length < 0)
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goto out;
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}
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length = count;
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out:
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free_page((unsigned long) page);
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return length;
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}
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#else
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#define sel_write_disable NULL
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#endif
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static struct file_operations sel_disable_ops = {
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.write = sel_write_disable,
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};
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static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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static struct file_operations sel_policyvers_ops = {
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.read = sel_read_policyvers,
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};
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/* declaration for sel_write_load */
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static int sel_make_bools(void);
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static ssize_t sel_read_mls(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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static struct file_operations sel_mls_ops = {
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.read = sel_read_mls,
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};
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static ssize_t sel_write_load(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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int ret;
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ssize_t length;
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void *data = NULL;
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down(&sel_sem);
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length = task_has_security(current, SECURITY__LOAD_POLICY);
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if (length)
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goto out;
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if (*ppos != 0) {
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/* No partial writes. */
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length = -EINVAL;
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goto out;
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}
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if ((count > 64 * 1024 * 1024)
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|| (data = vmalloc(count)) == NULL) {
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length = -ENOMEM;
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goto out;
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}
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length = -EFAULT;
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if (copy_from_user(data, buf, count) != 0)
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goto out;
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length = security_load_policy(data, count);
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if (length)
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goto out;
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ret = sel_make_bools();
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if (ret)
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length = ret;
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else
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length = count;
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out:
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up(&sel_sem);
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vfree(data);
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return length;
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}
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static struct file_operations sel_load_ops = {
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.write = sel_write_load,
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};
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static ssize_t sel_write_context(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 *page;
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u32 sid;
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ssize_t length;
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length = task_has_security(current, SECURITY__CHECK_CONTEXT);
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if (length)
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return length;
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if (count >= PAGE_SIZE)
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return -ENOMEM;
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if (*ppos != 0) {
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/* No partial writes. */
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return -EINVAL;
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}
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page = (char*)get_zeroed_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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length = -EFAULT;
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if (copy_from_user(page, buf, count))
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goto out;
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length = security_context_to_sid(page, count, &sid);
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if (length < 0)
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goto out;
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length = count;
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out:
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free_page((unsigned long) page);
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return length;
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}
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static struct file_operations sel_context_ops = {
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.write = sel_write_context,
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};
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static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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char tmpbuf[TMPBUFLEN];
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ssize_t length;
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length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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static ssize_t sel_write_checkreqprot(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 *page;
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ssize_t length;
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unsigned int new_value;
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length = task_has_security(current, SECURITY__SETCHECKREQPROT);
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if (length)
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return length;
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|
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if (count >= PAGE_SIZE)
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return -ENOMEM;
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if (*ppos != 0) {
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/* No partial writes. */
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return -EINVAL;
|
|
}
|
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page = (char*)get_zeroed_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
|
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length = -EFAULT;
|
|
if (copy_from_user(page, buf, count))
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goto out;
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length = -EINVAL;
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if (sscanf(page, "%u", &new_value) != 1)
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|
goto out;
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|
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selinux_checkreqprot = new_value ? 1 : 0;
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length = count;
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out:
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|
free_page((unsigned long) page);
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return length;
|
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}
|
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static struct file_operations sel_checkreqprot_ops = {
|
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.read = sel_read_checkreqprot,
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.write = sel_write_checkreqprot,
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};
|
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|
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/*
|
|
* Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
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*/
|
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static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
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static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
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static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
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static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
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static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
|
|
|
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static ssize_t (*write_op[])(struct file *, char *, size_t) = {
|
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[SEL_ACCESS] = sel_write_access,
|
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[SEL_CREATE] = sel_write_create,
|
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[SEL_RELABEL] = sel_write_relabel,
|
|
[SEL_USER] = sel_write_user,
|
|
[SEL_MEMBER] = sel_write_member,
|
|
};
|
|
|
|
static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
|
|
{
|
|
ino_t ino = file->f_dentry->d_inode->i_ino;
|
|
char *data;
|
|
ssize_t rv;
|
|
|
|
if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
|
|
return -EINVAL;
|
|
|
|
data = simple_transaction_get(file, buf, size);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
rv = write_op[ino](file, data, size);
|
|
if (rv>0) {
|
|
simple_transaction_set(file, rv);
|
|
rv = size;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static struct file_operations transaction_ops = {
|
|
.write = selinux_transaction_write,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
};
|
|
|
|
/*
|
|
* payload - write methods
|
|
* If the method has a response, the response should be put in buf,
|
|
* and the length returned. Otherwise return 0 or and -error.
|
|
*/
|
|
|
|
static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
|
|
{
|
|
char *scon, *tcon;
|
|
u32 ssid, tsid;
|
|
u16 tclass;
|
|
u32 req;
|
|
struct av_decision avd;
|
|
ssize_t length;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_AV);
|
|
if (length)
|
|
return length;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!scon)
|
|
return length;
|
|
|
|
tcon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
|
|
goto out2;
|
|
|
|
length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
|
|
if (length < 0)
|
|
goto out2;
|
|
length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_compute_av(ssid, tsid, tclass, req, &avd);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
|
|
"%x %x %x %x %u",
|
|
avd.allowed, avd.decided,
|
|
avd.auditallow, avd.auditdeny,
|
|
avd.seqno);
|
|
out2:
|
|
kfree(tcon);
|
|
out:
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
|
|
{
|
|
char *scon, *tcon;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon;
|
|
u32 len;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_CREATE);
|
|
if (length)
|
|
return length;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!scon)
|
|
return length;
|
|
|
|
tcon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out2;
|
|
|
|
length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
|
|
if (length < 0)
|
|
goto out2;
|
|
length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_transition_sid(ssid, tsid, tclass, &newsid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "%s: context size (%u) exceeds payload "
|
|
"max\n", __FUNCTION__, len);
|
|
length = -ERANGE;
|
|
goto out3;
|
|
}
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out3:
|
|
kfree(newcon);
|
|
out2:
|
|
kfree(tcon);
|
|
out:
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
|
|
{
|
|
char *scon, *tcon;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon;
|
|
u32 len;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
|
|
if (length)
|
|
return length;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!scon)
|
|
return length;
|
|
|
|
tcon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out2;
|
|
|
|
length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
|
|
if (length < 0)
|
|
goto out2;
|
|
length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_change_sid(ssid, tsid, tclass, &newsid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
length = -ERANGE;
|
|
goto out3;
|
|
}
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out3:
|
|
kfree(newcon);
|
|
out2:
|
|
kfree(tcon);
|
|
out:
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
|
|
{
|
|
char *con, *user, *ptr;
|
|
u32 sid, *sids;
|
|
ssize_t length;
|
|
char *newcon;
|
|
int i, rc;
|
|
u32 len, nsids;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_USER);
|
|
if (length)
|
|
return length;
|
|
|
|
length = -ENOMEM;
|
|
con = kzalloc(size+1, GFP_KERNEL);
|
|
if (!con)
|
|
return length;
|
|
|
|
user = kzalloc(size+1, GFP_KERNEL);
|
|
if (!user)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s", con, user) != 2)
|
|
goto out2;
|
|
|
|
length = security_context_to_sid(con, strlen(con)+1, &sid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_get_user_sids(sid, user, &sids, &nsids);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = sprintf(buf, "%u", nsids) + 1;
|
|
ptr = buf + length;
|
|
for (i = 0; i < nsids; i++) {
|
|
rc = security_sid_to_context(sids[i], &newcon, &len);
|
|
if (rc) {
|
|
length = rc;
|
|
goto out3;
|
|
}
|
|
if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
|
|
kfree(newcon);
|
|
length = -ERANGE;
|
|
goto out3;
|
|
}
|
|
memcpy(ptr, newcon, len);
|
|
kfree(newcon);
|
|
ptr += len;
|
|
length += len;
|
|
}
|
|
out3:
|
|
kfree(sids);
|
|
out2:
|
|
kfree(user);
|
|
out:
|
|
kfree(con);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
|
|
{
|
|
char *scon, *tcon;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon;
|
|
u32 len;
|
|
|
|
length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
|
|
if (length)
|
|
return length;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!scon)
|
|
return length;
|
|
|
|
tcon = kzalloc(size+1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out2;
|
|
|
|
length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
|
|
if (length < 0)
|
|
goto out2;
|
|
length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_member_sid(ssid, tsid, tclass, &newsid);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length < 0)
|
|
goto out2;
|
|
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "%s: context size (%u) exceeds payload "
|
|
"max\n", __FUNCTION__, len);
|
|
length = -ERANGE;
|
|
goto out3;
|
|
}
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out3:
|
|
kfree(newcon);
|
|
out2:
|
|
kfree(tcon);
|
|
out:
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static struct inode *sel_make_inode(struct super_block *sb, int mode)
|
|
{
|
|
struct inode *ret = new_inode(sb);
|
|
|
|
if (ret) {
|
|
ret->i_mode = mode;
|
|
ret->i_uid = ret->i_gid = 0;
|
|
ret->i_blksize = PAGE_CACHE_SIZE;
|
|
ret->i_blocks = 0;
|
|
ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#define BOOL_INO_OFFSET 30
|
|
|
|
static ssize_t sel_read_bool(struct file *filep, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page = NULL;
|
|
ssize_t length;
|
|
ssize_t end;
|
|
ssize_t ret;
|
|
int cur_enforcing;
|
|
struct inode *inode;
|
|
|
|
down(&sel_sem);
|
|
|
|
ret = -EFAULT;
|
|
|
|
/* check to see if this file has been deleted */
|
|
if (!filep->f_op)
|
|
goto out;
|
|
|
|
if (count > PAGE_SIZE) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
inode = filep->f_dentry->d_inode;
|
|
cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
|
|
if (cur_enforcing < 0) {
|
|
ret = cur_enforcing;
|
|
goto out;
|
|
}
|
|
|
|
length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
|
|
bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
|
|
if (length < 0) {
|
|
ret = length;
|
|
goto out;
|
|
}
|
|
|
|
if (*ppos >= length) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
if (count + *ppos > length)
|
|
count = length - *ppos;
|
|
end = count + *ppos;
|
|
if (copy_to_user(buf, (char *) page + *ppos, count)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
*ppos = end;
|
|
ret = count;
|
|
out:
|
|
up(&sel_sem);
|
|
if (page)
|
|
free_page((unsigned long)page);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page = NULL;
|
|
ssize_t length = -EFAULT;
|
|
int new_value;
|
|
struct inode *inode;
|
|
|
|
down(&sel_sem);
|
|
|
|
length = task_has_security(current, SECURITY__SETBOOL);
|
|
if (length)
|
|
goto out;
|
|
|
|
/* check to see if this file has been deleted */
|
|
if (!filep->f_op)
|
|
goto out;
|
|
|
|
if (count >= PAGE_SIZE) {
|
|
length = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (*ppos != 0) {
|
|
/* No partial writes. */
|
|
goto out;
|
|
}
|
|
page = (char*)get_zeroed_page(GFP_KERNEL);
|
|
if (!page) {
|
|
length = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(page, buf, count))
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%d", &new_value) != 1)
|
|
goto out;
|
|
|
|
if (new_value)
|
|
new_value = 1;
|
|
|
|
inode = filep->f_dentry->d_inode;
|
|
bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
|
|
length = count;
|
|
|
|
out:
|
|
up(&sel_sem);
|
|
if (page)
|
|
free_page((unsigned long) page);
|
|
return length;
|
|
}
|
|
|
|
static struct file_operations sel_bool_ops = {
|
|
.read = sel_read_bool,
|
|
.write = sel_write_bool,
|
|
};
|
|
|
|
static ssize_t sel_commit_bools_write(struct file *filep,
|
|
const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page = NULL;
|
|
ssize_t length = -EFAULT;
|
|
int new_value;
|
|
|
|
down(&sel_sem);
|
|
|
|
length = task_has_security(current, SECURITY__SETBOOL);
|
|
if (length)
|
|
goto out;
|
|
|
|
/* check to see if this file has been deleted */
|
|
if (!filep->f_op)
|
|
goto out;
|
|
|
|
if (count >= PAGE_SIZE) {
|
|
length = -ENOMEM;
|
|
goto out;
|
|
}
|
|
if (*ppos != 0) {
|
|
/* No partial writes. */
|
|
goto out;
|
|
}
|
|
page = (char*)get_zeroed_page(GFP_KERNEL);
|
|
if (!page) {
|
|
length = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(page, buf, count))
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%d", &new_value) != 1)
|
|
goto out;
|
|
|
|
if (new_value && bool_pending_values) {
|
|
security_set_bools(bool_num, bool_pending_values);
|
|
}
|
|
|
|
length = count;
|
|
|
|
out:
|
|
up(&sel_sem);
|
|
if (page)
|
|
free_page((unsigned long) page);
|
|
return length;
|
|
}
|
|
|
|
static struct file_operations sel_commit_bools_ops = {
|
|
.write = sel_commit_bools_write,
|
|
};
|
|
|
|
/* delete booleans - partial revoke() from
|
|
* fs/proc/generic.c proc_kill_inodes */
|
|
static void sel_remove_bools(struct dentry *de)
|
|
{
|
|
struct list_head *p, *node;
|
|
struct super_block *sb = de->d_sb;
|
|
|
|
spin_lock(&dcache_lock);
|
|
node = de->d_subdirs.next;
|
|
while (node != &de->d_subdirs) {
|
|
struct dentry *d = list_entry(node, struct dentry, d_child);
|
|
list_del_init(node);
|
|
|
|
if (d->d_inode) {
|
|
d = dget_locked(d);
|
|
spin_unlock(&dcache_lock);
|
|
d_delete(d);
|
|
simple_unlink(de->d_inode, d);
|
|
dput(d);
|
|
spin_lock(&dcache_lock);
|
|
}
|
|
node = de->d_subdirs.next;
|
|
}
|
|
|
|
spin_unlock(&dcache_lock);
|
|
|
|
file_list_lock();
|
|
list_for_each(p, &sb->s_files) {
|
|
struct file * filp = list_entry(p, struct file, f_u.fu_list);
|
|
struct dentry * dentry = filp->f_dentry;
|
|
|
|
if (dentry->d_parent != de) {
|
|
continue;
|
|
}
|
|
filp->f_op = NULL;
|
|
}
|
|
file_list_unlock();
|
|
}
|
|
|
|
#define BOOL_DIR_NAME "booleans"
|
|
|
|
static int sel_make_bools(void)
|
|
{
|
|
int i, ret = 0;
|
|
ssize_t len;
|
|
struct dentry *dentry = NULL;
|
|
struct dentry *dir = bool_dir;
|
|
struct inode *inode = NULL;
|
|
struct inode_security_struct *isec;
|
|
char **names = NULL, *page;
|
|
int num;
|
|
int *values = NULL;
|
|
u32 sid;
|
|
|
|
/* remove any existing files */
|
|
kfree(bool_pending_values);
|
|
bool_pending_values = NULL;
|
|
|
|
sel_remove_bools(dir);
|
|
|
|
if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
|
|
return -ENOMEM;
|
|
|
|
ret = security_get_bools(&num, &names, &values);
|
|
if (ret != 0)
|
|
goto out;
|
|
|
|
for (i = 0; i < num; i++) {
|
|
dentry = d_alloc_name(dir, names[i]);
|
|
if (!dentry) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
|
|
if (!inode) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
|
|
if (len < 0) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
} else if (len >= PAGE_SIZE) {
|
|
ret = -ENAMETOOLONG;
|
|
goto err;
|
|
}
|
|
isec = (struct inode_security_struct*)inode->i_security;
|
|
if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
|
|
goto err;
|
|
isec->sid = sid;
|
|
isec->initialized = 1;
|
|
inode->i_fop = &sel_bool_ops;
|
|
inode->i_ino = i + BOOL_INO_OFFSET;
|
|
d_add(dentry, inode);
|
|
}
|
|
bool_num = num;
|
|
bool_pending_values = values;
|
|
out:
|
|
free_page((unsigned long)page);
|
|
if (names) {
|
|
for (i = 0; i < num; i++)
|
|
kfree(names[i]);
|
|
kfree(names);
|
|
}
|
|
return ret;
|
|
err:
|
|
kfree(values);
|
|
d_genocide(dir);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
#define NULL_FILE_NAME "null"
|
|
|
|
struct dentry *selinux_null = NULL;
|
|
|
|
static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char tmpbuf[TMPBUFLEN];
|
|
ssize_t length;
|
|
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static ssize_t sel_write_avc_cache_threshold(struct file * file,
|
|
const char __user * buf,
|
|
size_t count, loff_t *ppos)
|
|
|
|
{
|
|
char *page;
|
|
ssize_t ret;
|
|
int new_value;
|
|
|
|
if (count >= PAGE_SIZE) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (*ppos != 0) {
|
|
/* No partial writes. */
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
page = (char*)get_zeroed_page(GFP_KERNEL);
|
|
if (!page) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_from_user(page, buf, count)) {
|
|
ret = -EFAULT;
|
|
goto out_free;
|
|
}
|
|
|
|
if (sscanf(page, "%u", &new_value) != 1) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (new_value != avc_cache_threshold) {
|
|
ret = task_has_security(current, SECURITY__SETSECPARAM);
|
|
if (ret)
|
|
goto out_free;
|
|
avc_cache_threshold = new_value;
|
|
}
|
|
ret = count;
|
|
out_free:
|
|
free_page((unsigned long)page);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page;
|
|
ssize_t ret = 0;
|
|
|
|
page = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!page) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ret = avc_get_hash_stats(page);
|
|
if (ret >= 0)
|
|
ret = simple_read_from_buffer(buf, count, ppos, page, ret);
|
|
free_page((unsigned long)page);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static struct file_operations sel_avc_cache_threshold_ops = {
|
|
.read = sel_read_avc_cache_threshold,
|
|
.write = sel_write_avc_cache_threshold,
|
|
};
|
|
|
|
static struct file_operations sel_avc_hash_stats_ops = {
|
|
.read = sel_read_avc_hash_stats,
|
|
};
|
|
|
|
#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
|
|
static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
|
|
{
|
|
int cpu;
|
|
|
|
for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
|
|
if (!cpu_possible(cpu))
|
|
continue;
|
|
*idx = cpu + 1;
|
|
return &per_cpu(avc_cache_stats, cpu);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
loff_t n = *pos - 1;
|
|
|
|
if (*pos == 0)
|
|
return SEQ_START_TOKEN;
|
|
|
|
return sel_avc_get_stat_idx(&n);
|
|
}
|
|
|
|
static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
return sel_avc_get_stat_idx(pos);
|
|
}
|
|
|
|
static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct avc_cache_stats *st = v;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_printf(seq, "lookups hits misses allocations reclaims "
|
|
"frees\n");
|
|
else
|
|
seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
|
|
st->hits, st->misses, st->allocations,
|
|
st->reclaims, st->frees);
|
|
return 0;
|
|
}
|
|
|
|
static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
|
|
{ }
|
|
|
|
static struct seq_operations sel_avc_cache_stats_seq_ops = {
|
|
.start = sel_avc_stats_seq_start,
|
|
.next = sel_avc_stats_seq_next,
|
|
.show = sel_avc_stats_seq_show,
|
|
.stop = sel_avc_stats_seq_stop,
|
|
};
|
|
|
|
static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &sel_avc_cache_stats_seq_ops);
|
|
}
|
|
|
|
static struct file_operations sel_avc_cache_stats_ops = {
|
|
.open = sel_open_avc_cache_stats,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
#endif
|
|
|
|
static int sel_make_avc_files(struct dentry *dir)
|
|
{
|
|
int i, ret = 0;
|
|
static struct tree_descr files[] = {
|
|
{ "cache_threshold",
|
|
&sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
|
|
{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
|
|
#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
|
|
{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
|
|
#endif
|
|
};
|
|
|
|
for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) {
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
|
|
dentry = d_alloc_name(dir, files[i].name);
|
|
if (!dentry) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
|
|
if (!inode) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
inode->i_fop = files[i].ops;
|
|
d_add(dentry, inode);
|
|
}
|
|
out:
|
|
return ret;
|
|
err:
|
|
d_genocide(dir);
|
|
goto out;
|
|
}
|
|
|
|
static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
|
|
{
|
|
int ret = 0;
|
|
struct inode *inode;
|
|
|
|
inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
|
|
if (!inode) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
inode->i_op = &simple_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
d_add(dentry, inode);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int sel_fill_super(struct super_block * sb, void * data, int silent)
|
|
{
|
|
int ret;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
struct inode_security_struct *isec;
|
|
|
|
static struct tree_descr selinux_files[] = {
|
|
[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
|
|
[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
|
|
[SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
|
|
[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
|
|
[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
|
|
[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
|
|
[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
|
|
[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
|
|
/* last one */ {""}
|
|
};
|
|
ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
|
|
if (ret)
|
|
return ret;
|
|
|
|
dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
|
|
if (!inode)
|
|
goto out;
|
|
inode->i_op = &simple_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
d_add(dentry, inode);
|
|
bool_dir = dentry;
|
|
ret = sel_make_bools();
|
|
if (ret)
|
|
goto out;
|
|
|
|
dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
|
|
if (!inode)
|
|
goto out;
|
|
isec = (struct inode_security_struct*)inode->i_security;
|
|
isec->sid = SECINITSID_DEVNULL;
|
|
isec->sclass = SECCLASS_CHR_FILE;
|
|
isec->initialized = 1;
|
|
|
|
init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
|
|
d_add(dentry, inode);
|
|
selinux_null = dentry;
|
|
|
|
dentry = d_alloc_name(sb->s_root, "avc");
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
ret = sel_make_dir(sb, dentry);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = sel_make_avc_files(dentry);
|
|
if (ret)
|
|
goto out;
|
|
|
|
return 0;
|
|
out:
|
|
dput(dentry);
|
|
printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static struct super_block *sel_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return get_sb_single(fs_type, flags, data, sel_fill_super);
|
|
}
|
|
|
|
static struct file_system_type sel_fs_type = {
|
|
.name = "selinuxfs",
|
|
.get_sb = sel_get_sb,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
struct vfsmount *selinuxfs_mount;
|
|
|
|
static int __init init_sel_fs(void)
|
|
{
|
|
int err;
|
|
|
|
if (!selinux_enabled)
|
|
return 0;
|
|
err = register_filesystem(&sel_fs_type);
|
|
if (!err) {
|
|
selinuxfs_mount = kern_mount(&sel_fs_type);
|
|
if (IS_ERR(selinuxfs_mount)) {
|
|
printk(KERN_ERR "selinuxfs: could not mount!\n");
|
|
err = PTR_ERR(selinuxfs_mount);
|
|
selinuxfs_mount = NULL;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
__initcall(init_sel_fs);
|
|
|
|
#ifdef CONFIG_SECURITY_SELINUX_DISABLE
|
|
void exit_sel_fs(void)
|
|
{
|
|
unregister_filesystem(&sel_fs_type);
|
|
}
|
|
#endif
|
|
|