mirror of https://gitee.com/openkylin/linux.git
1952 lines
44 KiB
C
1952 lines
44 KiB
C
/* 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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* Updated: Hewlett-Packard <paul@paul-moore.com>
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*
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* Added support for the policy capability bitmap
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*
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* Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
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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/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/mutex.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 <linux/audit.h>
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#include <linux/uaccess.h>
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#include <linux/kobject.h>
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#include <linux/ctype.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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/* Policy capability filenames */
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static char *policycap_names[] = {
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"network_peer_controls",
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"open_perms",
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"extended_socket_class",
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"always_check_network",
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"cgroup_seclabel"
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};
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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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unsigned long checkreqprot;
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if (!kstrtoul(str, 0, &checkreqprot))
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selinux_checkreqprot = checkreqprot ? 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 DEFINE_MUTEX(sel_mutex);
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/* global data for booleans */
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static struct dentry *bool_dir;
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static int bool_num;
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static char **bool_pending_names;
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static int *bool_pending_values;
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/* global data for classes */
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static struct dentry *class_dir;
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static unsigned long last_class_ino;
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static char policy_opened;
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/* global data for policy capabilities */
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static struct dentry *policycap_dir;
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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_MEMBER, /* compute polyinstantiation membership decision */
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SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
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SEL_COMPAT_NET, /* whether to use old compat network packet controls */
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SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
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SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
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SEL_STATUS, /* export current status using mmap() */
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SEL_POLICY, /* allow userspace to read the in kernel policy */
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SEL_VALIDATE_TRANS, /* compute validatetrans decision */
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SEL_INO_NEXT, /* The next inode number to use */
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};
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static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
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#define SEL_INITCON_INO_OFFSET 0x01000000
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#define SEL_BOOL_INO_OFFSET 0x02000000
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#define SEL_CLASS_INO_OFFSET 0x04000000
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#define SEL_POLICYCAP_INO_OFFSET 0x08000000
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#define SEL_INO_MASK 0x00ffffff
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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 = NULL;
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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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/* No partial writes. */
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if (*ppos != 0)
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return -EINVAL;
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page = memdup_user_nul(buf, count);
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if (IS_ERR(page))
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return PTR_ERR(page);
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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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new_value = !!new_value;
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if (new_value != selinux_enforcing) {
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length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
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SECCLASS_SECURITY, SECURITY__SETENFORCE,
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NULL);
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if (length)
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goto out;
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audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
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"enforcing=%d old_enforcing=%d auid=%u ses=%u",
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new_value, selinux_enforcing,
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from_kuid(&init_user_ns, audit_get_loginuid(current)),
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audit_get_sessionid(current));
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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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selinux_status_update_setenforce(selinux_enforcing);
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}
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length = count;
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out:
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kfree(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 const 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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.llseek = generic_file_llseek,
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};
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static ssize_t sel_read_handle_unknown(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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ino_t ino = file_inode(filp)->i_ino;
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int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
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security_get_reject_unknown() : !security_get_allow_unknown();
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length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
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return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
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}
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static const struct file_operations sel_handle_unknown_ops = {
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.read = sel_read_handle_unknown,
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.llseek = generic_file_llseek,
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};
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static int sel_open_handle_status(struct inode *inode, struct file *filp)
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{
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struct page *status = selinux_kernel_status_page();
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if (!status)
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return -ENOMEM;
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filp->private_data = status;
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return 0;
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}
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static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct page *status = filp->private_data;
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BUG_ON(!status);
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return simple_read_from_buffer(buf, count, ppos,
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page_address(status),
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sizeof(struct selinux_kernel_status));
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}
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static int sel_mmap_handle_status(struct file *filp,
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struct vm_area_struct *vma)
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{
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struct page *status = filp->private_data;
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unsigned long size = vma->vm_end - vma->vm_start;
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BUG_ON(!status);
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/* only allows one page from the head */
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if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
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return -EIO;
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/* disallow writable mapping */
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if (vma->vm_flags & VM_WRITE)
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return -EPERM;
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/* disallow mprotect() turns it into writable */
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vma->vm_flags &= ~VM_MAYWRITE;
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return remap_pfn_range(vma, vma->vm_start,
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page_to_pfn(status),
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size, vma->vm_page_prot);
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}
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static const struct file_operations sel_handle_status_ops = {
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.open = sel_open_handle_status,
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.read = sel_read_handle_status,
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.mmap = sel_mmap_handle_status,
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.llseek = generic_file_llseek,
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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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if (count >= PAGE_SIZE)
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return -ENOMEM;
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/* No partial writes. */
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if (*ppos != 0)
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return -EINVAL;
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page = memdup_user_nul(buf, count);
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if (IS_ERR(page))
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return PTR_ERR(page);
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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)
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goto out;
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audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
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"selinux=0 auid=%u ses=%u",
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from_kuid(&init_user_ns, audit_get_loginuid(current)),
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audit_get_sessionid(current));
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}
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length = count;
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out:
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kfree(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 const struct file_operations sel_disable_ops = {
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.write = sel_write_disable,
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.llseek = generic_file_llseek,
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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 const struct file_operations sel_policyvers_ops = {
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.read = sel_read_policyvers,
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.llseek = generic_file_llseek,
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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 int sel_make_classes(void);
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static int sel_make_policycap(void);
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/* declaration for sel_make_class_dirs */
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static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
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unsigned long *ino);
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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",
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security_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 const struct file_operations sel_mls_ops = {
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.read = sel_read_mls,
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.llseek = generic_file_llseek,
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};
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struct policy_load_memory {
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size_t len;
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void *data;
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};
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static int sel_open_policy(struct inode *inode, struct file *filp)
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{
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struct policy_load_memory *plm = NULL;
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int rc;
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BUG_ON(filp->private_data);
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mutex_lock(&sel_mutex);
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rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
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SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
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if (rc)
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goto err;
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rc = -EBUSY;
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if (policy_opened)
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goto err;
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rc = -ENOMEM;
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plm = kzalloc(sizeof(*plm), GFP_KERNEL);
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if (!plm)
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goto err;
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if (i_size_read(inode) != security_policydb_len()) {
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inode_lock(inode);
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i_size_write(inode, security_policydb_len());
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inode_unlock(inode);
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}
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rc = security_read_policy(&plm->data, &plm->len);
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if (rc)
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goto err;
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policy_opened = 1;
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filp->private_data = plm;
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mutex_unlock(&sel_mutex);
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return 0;
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err:
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mutex_unlock(&sel_mutex);
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if (plm)
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vfree(plm->data);
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kfree(plm);
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return rc;
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}
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static int sel_release_policy(struct inode *inode, struct file *filp)
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{
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struct policy_load_memory *plm = filp->private_data;
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BUG_ON(!plm);
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policy_opened = 0;
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vfree(plm->data);
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kfree(plm);
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return 0;
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}
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static ssize_t sel_read_policy(struct file *filp, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct policy_load_memory *plm = filp->private_data;
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int ret;
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mutex_lock(&sel_mutex);
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ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
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SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
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if (ret)
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goto out;
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ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
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out:
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mutex_unlock(&sel_mutex);
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return ret;
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}
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static int sel_mmap_policy_fault(struct vm_fault *vmf)
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{
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struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
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unsigned long offset;
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struct page *page;
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if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
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return VM_FAULT_SIGBUS;
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offset = vmf->pgoff << PAGE_SHIFT;
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if (offset >= roundup(plm->len, PAGE_SIZE))
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return VM_FAULT_SIGBUS;
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page = vmalloc_to_page(plm->data + offset);
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get_page(page);
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vmf->page = page;
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return 0;
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}
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static const struct vm_operations_struct sel_mmap_policy_ops = {
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.fault = sel_mmap_policy_fault,
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.page_mkwrite = sel_mmap_policy_fault,
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};
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static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
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{
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if (vma->vm_flags & VM_SHARED) {
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/* do not allow mprotect to make mapping writable */
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vma->vm_flags &= ~VM_MAYWRITE;
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if (vma->vm_flags & VM_WRITE)
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return -EACCES;
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}
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vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
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vma->vm_ops = &sel_mmap_policy_ops;
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return 0;
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}
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static const struct file_operations sel_policy_ops = {
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.open = sel_open_policy,
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.read = sel_read_policy,
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.mmap = sel_mmap_policy,
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.release = sel_release_policy,
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.llseek = generic_file_llseek,
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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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ssize_t length;
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void *data = NULL;
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mutex_lock(&sel_mutex);
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length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
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SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
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if (length)
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goto out;
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/* No partial writes. */
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length = -EINVAL;
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if (*ppos != 0)
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goto out;
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length = -EFBIG;
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if (count > 64 * 1024 * 1024)
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goto out;
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length = -ENOMEM;
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data = vmalloc(count);
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if (!data)
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goto out;
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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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pr_warn_ratelimited("SELinux: failed to load policy\n");
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goto out;
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}
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length = sel_make_bools();
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if (length) {
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pr_err("SELinux: failed to load policy booleans\n");
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goto out1;
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}
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length = sel_make_classes();
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if (length) {
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pr_err("SELinux: failed to load policy classes\n");
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goto out1;
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}
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length = sel_make_policycap();
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if (length) {
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pr_err("SELinux: failed to load policy capabilities\n");
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goto out1;
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}
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length = count;
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out1:
|
|
audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
|
|
"policy loaded auid=%u ses=%u",
|
|
from_kuid(&init_user_ns, audit_get_loginuid(current)),
|
|
audit_get_sessionid(current));
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
vfree(data);
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_load_ops = {
|
|
.write = sel_write_load,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *canon = NULL;
|
|
u32 sid, len;
|
|
ssize_t length;
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(sid, &canon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
|
|
"payload max\n", __func__, len);
|
|
goto out;
|
|
}
|
|
|
|
memcpy(buf, canon, len);
|
|
length = len;
|
|
out:
|
|
kfree(canon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char tmpbuf[TMPBUFLEN];
|
|
ssize_t length;
|
|
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *page;
|
|
ssize_t length;
|
|
unsigned int new_value;
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
|
|
NULL);
|
|
if (length)
|
|
return length;
|
|
|
|
if (count >= PAGE_SIZE)
|
|
return -ENOMEM;
|
|
|
|
/* No partial writes. */
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page))
|
|
return PTR_ERR(page);
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%u", &new_value) != 1)
|
|
goto out;
|
|
|
|
selinux_checkreqprot = new_value ? 1 : 0;
|
|
length = count;
|
|
out:
|
|
kfree(page);
|
|
return length;
|
|
}
|
|
static const struct file_operations sel_checkreqprot_ops = {
|
|
.read = sel_read_checkreqprot,
|
|
.write = sel_write_checkreqprot,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_write_validatetrans(struct file *file,
|
|
const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
|
|
char *req = NULL;
|
|
u32 osid, nsid, tsid;
|
|
u16 tclass;
|
|
int rc;
|
|
|
|
rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
/* No partial writes. */
|
|
rc = -EINVAL;
|
|
if (*ppos != 0)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
req = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!req)
|
|
goto out;
|
|
|
|
rc = -EFAULT;
|
|
if (copy_from_user(req, buf, count))
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
oldcon = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!oldcon)
|
|
goto out;
|
|
|
|
newcon = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!newcon)
|
|
goto out;
|
|
|
|
taskcon = kzalloc(count + 1, GFP_KERNEL);
|
|
if (!taskcon)
|
|
goto out;
|
|
|
|
rc = -EINVAL;
|
|
if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
|
|
goto out;
|
|
|
|
rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = security_validate_transition_user(osid, nsid, tsid, tclass);
|
|
if (!rc)
|
|
rc = count;
|
|
out:
|
|
kfree(req);
|
|
kfree(oldcon);
|
|
kfree(newcon);
|
|
kfree(taskcon);
|
|
return rc;
|
|
}
|
|
|
|
static const struct file_operations sel_transition_ops = {
|
|
.write = sel_write_validatetrans,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/*
|
|
* Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
|
|
*/
|
|
static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
|
|
static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
|
|
|
|
static ssize_t (*write_op[])(struct file *, char *, size_t) = {
|
|
[SEL_ACCESS] = sel_write_access,
|
|
[SEL_CREATE] = sel_write_create,
|
|
[SEL_RELABEL] = sel_write_relabel,
|
|
[SEL_USER] = sel_write_user,
|
|
[SEL_MEMBER] = sel_write_member,
|
|
[SEL_CONTEXT] = sel_write_context,
|
|
};
|
|
|
|
static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
|
|
{
|
|
ino_t ino = file_inode(file)->i_ino;
|
|
char *data;
|
|
ssize_t rv;
|
|
|
|
if (ino >= ARRAY_SIZE(write_op) || !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 const struct file_operations transaction_ops = {
|
|
.write = selinux_transaction_write,
|
|
.read = simple_transaction_read,
|
|
.release = simple_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/*
|
|
* 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 = NULL, *tcon = NULL;
|
|
u32 ssid, tsid;
|
|
u16 tclass;
|
|
struct av_decision avd;
|
|
ssize_t length;
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
security_compute_av_user(ssid, tsid, tclass, &avd);
|
|
|
|
length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
|
|
"%x %x %x %x %u %x",
|
|
avd.allowed, 0xffffffff,
|
|
avd.auditallow, avd.auditdeny,
|
|
avd.seqno, avd.flags);
|
|
out:
|
|
kfree(tcon);
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *scon = NULL, *tcon = NULL;
|
|
char *namebuf = NULL, *objname = NULL;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon = NULL;
|
|
u32 len;
|
|
int nargs;
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
|
|
NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
namebuf = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!namebuf)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
|
|
if (nargs < 3 || nargs > 4)
|
|
goto out;
|
|
if (nargs == 4) {
|
|
/*
|
|
* If and when the name of new object to be queried contains
|
|
* either whitespace or multibyte characters, they shall be
|
|
* encoded based on the percentage-encoding rule.
|
|
* If not encoded, the sscanf logic picks up only left-half
|
|
* of the supplied name; splitted by a whitespace unexpectedly.
|
|
*/
|
|
char *r, *w;
|
|
int c1, c2;
|
|
|
|
r = w = namebuf;
|
|
do {
|
|
c1 = *r++;
|
|
if (c1 == '+')
|
|
c1 = ' ';
|
|
else if (c1 == '%') {
|
|
c1 = hex_to_bin(*r++);
|
|
if (c1 < 0)
|
|
goto out;
|
|
c2 = hex_to_bin(*r++);
|
|
if (c2 < 0)
|
|
goto out;
|
|
c1 = (c1 << 4) | c2;
|
|
}
|
|
*w++ = c1;
|
|
} while (c1 != '\0');
|
|
|
|
objname = namebuf;
|
|
}
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_transition_sid_user(ssid, tsid, tclass,
|
|
objname, &newsid);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
|
|
"payload max\n", __func__, len);
|
|
goto out;
|
|
}
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out:
|
|
kfree(newcon);
|
|
kfree(namebuf);
|
|
kfree(tcon);
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *scon = NULL, *tcon = NULL;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon = NULL;
|
|
u32 len;
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
|
|
NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_change_sid(ssid, tsid, tclass, &newsid);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT)
|
|
goto out;
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out:
|
|
kfree(newcon);
|
|
kfree(tcon);
|
|
kfree(scon);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *con = NULL, *user = NULL, *ptr;
|
|
u32 sid, *sids = NULL;
|
|
ssize_t length;
|
|
char *newcon;
|
|
int i, rc;
|
|
u32 len, nsids;
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
|
|
NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
con = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!con)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
user = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!user)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s", con, user) != 2)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_get_user_sids(sid, user, &sids, &nsids);
|
|
if (length)
|
|
goto out;
|
|
|
|
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 out;
|
|
}
|
|
if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
|
|
kfree(newcon);
|
|
length = -ERANGE;
|
|
goto out;
|
|
}
|
|
memcpy(ptr, newcon, len);
|
|
kfree(newcon);
|
|
ptr += len;
|
|
length += len;
|
|
}
|
|
out:
|
|
kfree(sids);
|
|
kfree(user);
|
|
kfree(con);
|
|
return length;
|
|
}
|
|
|
|
static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
|
|
{
|
|
char *scon = NULL, *tcon = NULL;
|
|
u32 ssid, tsid, newsid;
|
|
u16 tclass;
|
|
ssize_t length;
|
|
char *newcon = NULL;
|
|
u32 len;
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
|
|
NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
scon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!scon)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
tcon = kzalloc(size + 1, GFP_KERNEL);
|
|
if (!tcon)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_member_sid(ssid, tsid, tclass, &newsid);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = security_sid_to_context(newsid, &newcon, &len);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ERANGE;
|
|
if (len > SIMPLE_TRANSACTION_LIMIT) {
|
|
printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
|
|
"payload max\n", __func__, len);
|
|
goto out;
|
|
}
|
|
|
|
memcpy(buf, newcon, len);
|
|
length = len;
|
|
out:
|
|
kfree(newcon);
|
|
kfree(tcon);
|
|
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_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
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 ret;
|
|
int cur_enforcing;
|
|
unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
|
|
const char *name = filep->f_path.dentry->d_name.name;
|
|
|
|
mutex_lock(&sel_mutex);
|
|
|
|
ret = -EINVAL;
|
|
if (index >= bool_num || strcmp(name, bool_pending_names[index]))
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
page = (char *)get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
|
|
goto out;
|
|
|
|
cur_enforcing = security_get_bool_value(index);
|
|
if (cur_enforcing < 0) {
|
|
ret = cur_enforcing;
|
|
goto out;
|
|
}
|
|
length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
|
|
bool_pending_values[index]);
|
|
ret = simple_read_from_buffer(buf, count, ppos, page, length);
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
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;
|
|
int new_value;
|
|
unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
|
|
const char *name = filep->f_path.dentry->d_name.name;
|
|
|
|
mutex_lock(&sel_mutex);
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__SETBOOL,
|
|
NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -EINVAL;
|
|
if (index >= bool_num || strcmp(name, bool_pending_names[index]))
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
/* No partial writes. */
|
|
length = -EINVAL;
|
|
if (*ppos != 0)
|
|
goto out;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page)) {
|
|
length = PTR_ERR(page);
|
|
page = NULL;
|
|
goto out;
|
|
}
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%d", &new_value) != 1)
|
|
goto out;
|
|
|
|
if (new_value)
|
|
new_value = 1;
|
|
|
|
bool_pending_values[index] = new_value;
|
|
length = count;
|
|
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
kfree(page);
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_bool_ops = {
|
|
.read = sel_read_bool,
|
|
.write = sel_write_bool,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
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;
|
|
int new_value;
|
|
|
|
mutex_lock(&sel_mutex);
|
|
|
|
length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__SETBOOL,
|
|
NULL);
|
|
if (length)
|
|
goto out;
|
|
|
|
length = -ENOMEM;
|
|
if (count >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
/* No partial writes. */
|
|
length = -EINVAL;
|
|
if (*ppos != 0)
|
|
goto out;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page)) {
|
|
length = PTR_ERR(page);
|
|
page = NULL;
|
|
goto out;
|
|
}
|
|
|
|
length = -EINVAL;
|
|
if (sscanf(page, "%d", &new_value) != 1)
|
|
goto out;
|
|
|
|
length = 0;
|
|
if (new_value && bool_pending_values)
|
|
length = security_set_bools(bool_num, bool_pending_values);
|
|
|
|
if (!length)
|
|
length = count;
|
|
|
|
out:
|
|
mutex_unlock(&sel_mutex);
|
|
kfree(page);
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_commit_bools_ops = {
|
|
.write = sel_commit_bools_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static void sel_remove_entries(struct dentry *de)
|
|
{
|
|
d_genocide(de);
|
|
shrink_dcache_parent(de);
|
|
}
|
|
|
|
#define BOOL_DIR_NAME "booleans"
|
|
|
|
static int sel_make_bools(void)
|
|
{
|
|
int i, ret;
|
|
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 */
|
|
for (i = 0; i < bool_num; i++)
|
|
kfree(bool_pending_names[i]);
|
|
kfree(bool_pending_names);
|
|
kfree(bool_pending_values);
|
|
bool_num = 0;
|
|
bool_pending_names = NULL;
|
|
bool_pending_values = NULL;
|
|
|
|
sel_remove_entries(dir);
|
|
|
|
ret = -ENOMEM;
|
|
page = (char *)get_zeroed_page(GFP_KERNEL);
|
|
if (!page)
|
|
goto out;
|
|
|
|
ret = security_get_bools(&num, &names, &values);
|
|
if (ret)
|
|
goto out;
|
|
|
|
for (i = 0; i < num; i++) {
|
|
ret = -ENOMEM;
|
|
dentry = d_alloc_name(dir, names[i]);
|
|
if (!dentry)
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
ret = -ENAMETOOLONG;
|
|
len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
|
|
if (len >= PAGE_SIZE)
|
|
goto out;
|
|
|
|
isec = (struct inode_security_struct *)inode->i_security;
|
|
ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
|
|
if (ret) {
|
|
pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
|
|
page);
|
|
sid = SECINITSID_SECURITY;
|
|
}
|
|
|
|
isec->sid = sid;
|
|
isec->initialized = LABEL_INITIALIZED;
|
|
inode->i_fop = &sel_bool_ops;
|
|
inode->i_ino = i|SEL_BOOL_INO_OFFSET;
|
|
d_add(dentry, inode);
|
|
}
|
|
bool_num = num;
|
|
bool_pending_names = names;
|
|
bool_pending_values = values;
|
|
|
|
free_page((unsigned long)page);
|
|
return 0;
|
|
out:
|
|
free_page((unsigned long)page);
|
|
|
|
if (names) {
|
|
for (i = 0; i < num; i++)
|
|
kfree(names[i]);
|
|
kfree(names);
|
|
}
|
|
kfree(values);
|
|
sel_remove_entries(dir);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define NULL_FILE_NAME "null"
|
|
|
|
struct path selinux_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;
|
|
unsigned int new_value;
|
|
|
|
ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
|
|
SECCLASS_SECURITY, SECURITY__SETSECPARAM,
|
|
NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (count >= PAGE_SIZE)
|
|
return -ENOMEM;
|
|
|
|
/* No partial writes. */
|
|
if (*ppos != 0)
|
|
return -EINVAL;
|
|
|
|
page = memdup_user_nul(buf, count);
|
|
if (IS_ERR(page))
|
|
return PTR_ERR(page);
|
|
|
|
ret = -EINVAL;
|
|
if (sscanf(page, "%u", &new_value) != 1)
|
|
goto out;
|
|
|
|
avc_cache_threshold = new_value;
|
|
|
|
ret = count;
|
|
out:
|
|
kfree(page);
|
|
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 length;
|
|
|
|
page = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
length = avc_get_hash_stats(page);
|
|
if (length >= 0)
|
|
length = simple_read_from_buffer(buf, count, ppos, page, length);
|
|
free_page((unsigned long)page);
|
|
|
|
return length;
|
|
}
|
|
|
|
static const struct file_operations sel_avc_cache_threshold_ops = {
|
|
.read = sel_read_avc_cache_threshold,
|
|
.write = sel_write_avc_cache_threshold,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static const struct file_operations sel_avc_hash_stats_ops = {
|
|
.read = sel_read_avc_hash_stats,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
#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_cpu_ids; ++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_puts(seq,
|
|
"lookups hits misses allocations reclaims frees\n");
|
|
} else {
|
|
unsigned int lookups = st->lookups;
|
|
unsigned int misses = st->misses;
|
|
unsigned int hits = lookups - misses;
|
|
seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
|
|
hits, misses, st->allocations,
|
|
st->reclaims, st->frees);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
|
|
{ }
|
|
|
|
static const 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 const 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;
|
|
static const 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 < ARRAY_SIZE(files); i++) {
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
|
|
dentry = d_alloc_name(dir, files[i].name);
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = files[i].ops;
|
|
inode->i_ino = ++sel_last_ino;
|
|
d_add(dentry, inode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t sel_read_initcon(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char *con;
|
|
u32 sid, len;
|
|
ssize_t ret;
|
|
|
|
sid = file_inode(file)->i_ino&SEL_INO_MASK;
|
|
ret = security_sid_to_context(sid, &con, &len);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = simple_read_from_buffer(buf, count, ppos, con, len);
|
|
kfree(con);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations sel_initcon_ops = {
|
|
.read = sel_read_initcon,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int sel_make_initcon_files(struct dentry *dir)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i <= SECINITSID_NUM; i++) {
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = &sel_initcon_ops;
|
|
inode->i_ino = i|SEL_INITCON_INO_OFFSET;
|
|
d_add(dentry, inode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned long sel_class_to_ino(u16 class)
|
|
{
|
|
return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
|
|
}
|
|
|
|
static inline u16 sel_ino_to_class(unsigned long ino)
|
|
{
|
|
return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
|
|
}
|
|
|
|
static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
|
|
{
|
|
return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
|
|
}
|
|
|
|
static inline u32 sel_ino_to_perm(unsigned long ino)
|
|
{
|
|
return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
|
|
}
|
|
|
|
static ssize_t sel_read_class(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
unsigned long ino = file_inode(file)->i_ino;
|
|
char res[TMPBUFLEN];
|
|
ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
|
|
return simple_read_from_buffer(buf, count, ppos, res, len);
|
|
}
|
|
|
|
static const struct file_operations sel_class_ops = {
|
|
.read = sel_read_class,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_read_perm(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
unsigned long ino = file_inode(file)->i_ino;
|
|
char res[TMPBUFLEN];
|
|
ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
|
|
return simple_read_from_buffer(buf, count, ppos, res, len);
|
|
}
|
|
|
|
static const struct file_operations sel_perm_ops = {
|
|
.read = sel_read_perm,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static ssize_t sel_read_policycap(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
int value;
|
|
char tmpbuf[TMPBUFLEN];
|
|
ssize_t length;
|
|
unsigned long i_ino = file_inode(file)->i_ino;
|
|
|
|
value = security_policycap_supported(i_ino & SEL_INO_MASK);
|
|
length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
|
|
|
|
return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
|
|
}
|
|
|
|
static const struct file_operations sel_policycap_ops = {
|
|
.read = sel_read_policycap,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int sel_make_perm_files(char *objclass, int classvalue,
|
|
struct dentry *dir)
|
|
{
|
|
int i, rc, nperms;
|
|
char **perms;
|
|
|
|
rc = security_get_permissions(objclass, &perms, &nperms);
|
|
if (rc)
|
|
return rc;
|
|
|
|
for (i = 0; i < nperms; i++) {
|
|
struct inode *inode;
|
|
struct dentry *dentry;
|
|
|
|
rc = -ENOMEM;
|
|
dentry = d_alloc_name(dir, perms[i]);
|
|
if (!dentry)
|
|
goto out;
|
|
|
|
rc = -ENOMEM;
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
|
|
if (!inode)
|
|
goto out;
|
|
|
|
inode->i_fop = &sel_perm_ops;
|
|
/* i+1 since perm values are 1-indexed */
|
|
inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
|
|
d_add(dentry, inode);
|
|
}
|
|
rc = 0;
|
|
out:
|
|
for (i = 0; i < nperms; i++)
|
|
kfree(perms[i]);
|
|
kfree(perms);
|
|
return rc;
|
|
}
|
|
|
|
static int sel_make_class_dir_entries(char *classname, int index,
|
|
struct dentry *dir)
|
|
{
|
|
struct dentry *dentry = NULL;
|
|
struct inode *inode = NULL;
|
|
int rc;
|
|
|
|
dentry = d_alloc_name(dir, "index");
|
|
if (!dentry)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = &sel_class_ops;
|
|
inode->i_ino = sel_class_to_ino(index);
|
|
d_add(dentry, inode);
|
|
|
|
dentry = sel_make_dir(dir, "perms", &last_class_ino);
|
|
if (IS_ERR(dentry))
|
|
return PTR_ERR(dentry);
|
|
|
|
rc = sel_make_perm_files(classname, index, dentry);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int sel_make_classes(void)
|
|
{
|
|
int rc, nclasses, i;
|
|
char **classes;
|
|
|
|
/* delete any existing entries */
|
|
sel_remove_entries(class_dir);
|
|
|
|
rc = security_get_classes(&classes, &nclasses);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* +2 since classes are 1-indexed */
|
|
last_class_ino = sel_class_to_ino(nclasses + 2);
|
|
|
|
for (i = 0; i < nclasses; i++) {
|
|
struct dentry *class_name_dir;
|
|
|
|
class_name_dir = sel_make_dir(class_dir, classes[i],
|
|
&last_class_ino);
|
|
if (IS_ERR(class_name_dir)) {
|
|
rc = PTR_ERR(class_name_dir);
|
|
goto out;
|
|
}
|
|
|
|
/* i+1 since class values are 1-indexed */
|
|
rc = sel_make_class_dir_entries(classes[i], i + 1,
|
|
class_name_dir);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
rc = 0;
|
|
out:
|
|
for (i = 0; i < nclasses; i++)
|
|
kfree(classes[i]);
|
|
kfree(classes);
|
|
return rc;
|
|
}
|
|
|
|
static int sel_make_policycap(void)
|
|
{
|
|
unsigned int iter;
|
|
struct dentry *dentry = NULL;
|
|
struct inode *inode = NULL;
|
|
|
|
sel_remove_entries(policycap_dir);
|
|
|
|
for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
|
|
if (iter < ARRAY_SIZE(policycap_names))
|
|
dentry = d_alloc_name(policycap_dir,
|
|
policycap_names[iter]);
|
|
else
|
|
dentry = d_alloc_name(policycap_dir, "unknown");
|
|
|
|
if (dentry == NULL)
|
|
return -ENOMEM;
|
|
|
|
inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
|
|
if (inode == NULL)
|
|
return -ENOMEM;
|
|
|
|
inode->i_fop = &sel_policycap_ops;
|
|
inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
|
|
d_add(dentry, inode);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
|
|
unsigned long *ino)
|
|
{
|
|
struct dentry *dentry = d_alloc_name(dir, name);
|
|
struct inode *inode;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
|
|
if (!inode) {
|
|
dput(dentry);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
inode->i_op = &simple_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
inode->i_ino = ++(*ino);
|
|
/* directory inodes start off with i_nlink == 2 (for "." entry) */
|
|
inc_nlink(inode);
|
|
d_add(dentry, inode);
|
|
/* bump link count on parent directory, too */
|
|
inc_nlink(d_inode(dir));
|
|
|
|
return dentry;
|
|
}
|
|
|
|
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 const 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", &transaction_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},
|
|
[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
|
|
[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
|
|
[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
|
|
[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
|
|
[SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
|
|
S_IWUGO},
|
|
/* last one */ {""}
|
|
};
|
|
ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
|
|
if (ret)
|
|
goto err;
|
|
|
|
bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
|
|
if (IS_ERR(bool_dir)) {
|
|
ret = PTR_ERR(bool_dir);
|
|
bool_dir = NULL;
|
|
goto err;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
|
|
if (!dentry)
|
|
goto err;
|
|
|
|
ret = -ENOMEM;
|
|
inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
|
|
if (!inode)
|
|
goto err;
|
|
|
|
inode->i_ino = ++sel_last_ino;
|
|
isec = (struct inode_security_struct *)inode->i_security;
|
|
isec->sid = SECINITSID_DEVNULL;
|
|
isec->sclass = SECCLASS_CHR_FILE;
|
|
isec->initialized = LABEL_INITIALIZED;
|
|
|
|
init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
|
|
d_add(dentry, inode);
|
|
selinux_null.dentry = dentry;
|
|
|
|
dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
goto err;
|
|
}
|
|
|
|
ret = sel_make_avc_files(dentry);
|
|
if (ret)
|
|
goto err;
|
|
|
|
dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
|
|
if (IS_ERR(dentry)) {
|
|
ret = PTR_ERR(dentry);
|
|
goto err;
|
|
}
|
|
|
|
ret = sel_make_initcon_files(dentry);
|
|
if (ret)
|
|
goto err;
|
|
|
|
class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
|
|
if (IS_ERR(class_dir)) {
|
|
ret = PTR_ERR(class_dir);
|
|
class_dir = NULL;
|
|
goto err;
|
|
}
|
|
|
|
policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
|
|
if (IS_ERR(policycap_dir)) {
|
|
ret = PTR_ERR(policycap_dir);
|
|
policycap_dir = NULL;
|
|
goto err;
|
|
}
|
|
return 0;
|
|
err:
|
|
printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
|
|
__func__);
|
|
return ret;
|
|
}
|
|
|
|
static struct dentry *sel_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_single(fs_type, flags, data, sel_fill_super);
|
|
}
|
|
|
|
static struct file_system_type sel_fs_type = {
|
|
.name = "selinuxfs",
|
|
.mount = sel_mount,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
struct vfsmount *selinuxfs_mount;
|
|
|
|
static int __init init_sel_fs(void)
|
|
{
|
|
int err;
|
|
|
|
if (!selinux_enabled)
|
|
return 0;
|
|
|
|
err = sysfs_create_mount_point(fs_kobj, "selinux");
|
|
if (err)
|
|
return err;
|
|
|
|
err = register_filesystem(&sel_fs_type);
|
|
if (err) {
|
|
sysfs_remove_mount_point(fs_kobj, "selinux");
|
|
return err;
|
|
}
|
|
|
|
selinux_null.mnt = 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)
|
|
{
|
|
sysfs_remove_mount_point(fs_kobj, "selinux");
|
|
kern_unmount(selinuxfs_mount);
|
|
unregister_filesystem(&sel_fs_type);
|
|
}
|
|
#endif
|