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![David Howells](/assets/img/avatar_default.png)
... except where that code acts as a filesystem driver, rather than working with dentries given to it. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
969 lines
23 KiB
C
969 lines
23 KiB
C
/*
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* AppArmor security module
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*
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* This file contains AppArmor /sys/kernel/security/apparmor interface functions
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include <linux/ctype.h>
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#include <linux/security.h>
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/namei.h>
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#include <linux/capability.h>
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#include <linux/rcupdate.h>
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#include "include/apparmor.h"
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#include "include/apparmorfs.h"
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#include "include/audit.h"
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#include "include/context.h"
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#include "include/crypto.h"
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#include "include/policy.h"
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#include "include/resource.h"
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/**
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* aa_mangle_name - mangle a profile name to std profile layout form
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* @name: profile name to mangle (NOT NULL)
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* @target: buffer to store mangled name, same length as @name (MAYBE NULL)
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*
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* Returns: length of mangled name
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*/
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static int mangle_name(char *name, char *target)
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{
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char *t = target;
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while (*name == '/' || *name == '.')
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name++;
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if (target) {
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for (; *name; name++) {
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if (*name == '/')
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*(t)++ = '.';
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else if (isspace(*name))
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*(t)++ = '_';
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else if (isalnum(*name) || strchr("._-", *name))
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*(t)++ = *name;
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}
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*t = 0;
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} else {
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int len = 0;
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for (; *name; name++) {
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if (isalnum(*name) || isspace(*name) ||
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strchr("/._-", *name))
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len++;
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}
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return len;
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}
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return t - target;
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}
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/**
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* aa_simple_write_to_buffer - common routine for getting policy from user
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* @op: operation doing the user buffer copy
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* @userbuf: user buffer to copy data from (NOT NULL)
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* @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
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* @copy_size: size of data to copy from user buffer
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* @pos: position write is at in the file (NOT NULL)
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*
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* Returns: kernel buffer containing copy of user buffer data or an
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* ERR_PTR on failure.
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*/
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static char *aa_simple_write_to_buffer(int op, const char __user *userbuf,
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size_t alloc_size, size_t copy_size,
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loff_t *pos)
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{
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char *data;
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BUG_ON(copy_size > alloc_size);
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if (*pos != 0)
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/* only writes from pos 0, that is complete writes */
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return ERR_PTR(-ESPIPE);
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/*
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* Don't allow profile load/replace/remove from profiles that don't
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* have CAP_MAC_ADMIN
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*/
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if (!aa_may_manage_policy(op))
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return ERR_PTR(-EACCES);
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/* freed by caller to simple_write_to_buffer */
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data = kvmalloc(alloc_size);
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if (data == NULL)
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return ERR_PTR(-ENOMEM);
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if (copy_from_user(data, userbuf, copy_size)) {
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kvfree(data);
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return ERR_PTR(-EFAULT);
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}
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return data;
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}
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/* .load file hook fn to load policy */
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static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
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loff_t *pos)
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{
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char *data;
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ssize_t error;
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data = aa_simple_write_to_buffer(OP_PROF_LOAD, buf, size, size, pos);
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error = PTR_ERR(data);
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if (!IS_ERR(data)) {
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error = aa_replace_profiles(data, size, PROF_ADD);
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kvfree(data);
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}
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return error;
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}
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static const struct file_operations aa_fs_profile_load = {
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.write = profile_load,
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.llseek = default_llseek,
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};
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/* .replace file hook fn to load and/or replace policy */
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static ssize_t profile_replace(struct file *f, const char __user *buf,
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size_t size, loff_t *pos)
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{
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char *data;
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ssize_t error;
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data = aa_simple_write_to_buffer(OP_PROF_REPL, buf, size, size, pos);
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error = PTR_ERR(data);
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if (!IS_ERR(data)) {
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error = aa_replace_profiles(data, size, PROF_REPLACE);
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kvfree(data);
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}
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return error;
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}
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static const struct file_operations aa_fs_profile_replace = {
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.write = profile_replace,
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.llseek = default_llseek,
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};
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/* .remove file hook fn to remove loaded policy */
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static ssize_t profile_remove(struct file *f, const char __user *buf,
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size_t size, loff_t *pos)
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{
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char *data;
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ssize_t error;
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/*
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* aa_remove_profile needs a null terminated string so 1 extra
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* byte is allocated and the copied data is null terminated.
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*/
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data = aa_simple_write_to_buffer(OP_PROF_RM, buf, size + 1, size, pos);
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error = PTR_ERR(data);
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if (!IS_ERR(data)) {
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data[size] = 0;
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error = aa_remove_profiles(data, size);
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kvfree(data);
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}
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return error;
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}
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static const struct file_operations aa_fs_profile_remove = {
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.write = profile_remove,
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.llseek = default_llseek,
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};
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static int aa_fs_seq_show(struct seq_file *seq, void *v)
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{
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struct aa_fs_entry *fs_file = seq->private;
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if (!fs_file)
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return 0;
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switch (fs_file->v_type) {
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case AA_FS_TYPE_BOOLEAN:
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seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
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break;
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case AA_FS_TYPE_STRING:
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seq_printf(seq, "%s\n", fs_file->v.string);
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break;
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case AA_FS_TYPE_U64:
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seq_printf(seq, "%#08lx\n", fs_file->v.u64);
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break;
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default:
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/* Ignore unpritable entry types. */
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break;
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}
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return 0;
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}
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static int aa_fs_seq_open(struct inode *inode, struct file *file)
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{
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return single_open(file, aa_fs_seq_show, inode->i_private);
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}
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const struct file_operations aa_fs_seq_file_ops = {
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.owner = THIS_MODULE,
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.open = aa_fs_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
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int (*show)(struct seq_file *, void *))
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{
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struct aa_replacedby *r = aa_get_replacedby(inode->i_private);
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int error = single_open(file, show, r);
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if (error) {
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file->private_data = NULL;
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aa_put_replacedby(r);
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}
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return error;
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}
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static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
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{
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struct seq_file *seq = (struct seq_file *) file->private_data;
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if (seq)
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aa_put_replacedby(seq->private);
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return single_release(inode, file);
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}
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static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
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{
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struct aa_replacedby *r = seq->private;
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struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
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seq_printf(seq, "%s\n", profile->base.name);
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aa_put_profile(profile);
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return 0;
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}
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static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
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{
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return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
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}
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static const struct file_operations aa_fs_profname_fops = {
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.owner = THIS_MODULE,
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.open = aa_fs_seq_profname_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = aa_fs_seq_profile_release,
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};
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static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
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{
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struct aa_replacedby *r = seq->private;
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struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
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seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
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aa_put_profile(profile);
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return 0;
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}
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static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
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{
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return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
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}
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static const struct file_operations aa_fs_profmode_fops = {
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.owner = THIS_MODULE,
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.open = aa_fs_seq_profmode_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = aa_fs_seq_profile_release,
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};
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static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
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{
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struct aa_replacedby *r = seq->private;
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struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
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if (profile->attach)
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seq_printf(seq, "%s\n", profile->attach);
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else if (profile->xmatch)
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seq_puts(seq, "<unknown>\n");
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else
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seq_printf(seq, "%s\n", profile->base.name);
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aa_put_profile(profile);
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return 0;
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}
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static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
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{
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return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
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}
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static const struct file_operations aa_fs_profattach_fops = {
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.owner = THIS_MODULE,
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.open = aa_fs_seq_profattach_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = aa_fs_seq_profile_release,
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};
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static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
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{
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struct aa_replacedby *r = seq->private;
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struct aa_profile *profile = aa_get_profile_rcu(&r->profile);
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unsigned int i, size = aa_hash_size();
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if (profile->hash) {
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for (i = 0; i < size; i++)
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seq_printf(seq, "%.2x", profile->hash[i]);
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seq_puts(seq, "\n");
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}
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return 0;
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}
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static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
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{
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return single_open(file, aa_fs_seq_hash_show, inode->i_private);
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}
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static const struct file_operations aa_fs_seq_hash_fops = {
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.owner = THIS_MODULE,
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.open = aa_fs_seq_hash_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/** fns to setup dynamic per profile/namespace files **/
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void __aa_fs_profile_rmdir(struct aa_profile *profile)
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{
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struct aa_profile *child;
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int i;
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if (!profile)
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return;
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list_for_each_entry(child, &profile->base.profiles, base.list)
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__aa_fs_profile_rmdir(child);
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for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
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struct aa_replacedby *r;
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if (!profile->dents[i])
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continue;
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r = d_inode(profile->dents[i])->i_private;
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securityfs_remove(profile->dents[i]);
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aa_put_replacedby(r);
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profile->dents[i] = NULL;
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}
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}
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void __aa_fs_profile_migrate_dents(struct aa_profile *old,
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struct aa_profile *new)
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{
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int i;
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for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
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new->dents[i] = old->dents[i];
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old->dents[i] = NULL;
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}
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}
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static struct dentry *create_profile_file(struct dentry *dir, const char *name,
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struct aa_profile *profile,
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const struct file_operations *fops)
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{
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struct aa_replacedby *r = aa_get_replacedby(profile->replacedby);
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struct dentry *dent;
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dent = securityfs_create_file(name, S_IFREG | 0444, dir, r, fops);
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if (IS_ERR(dent))
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aa_put_replacedby(r);
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return dent;
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}
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/* requires lock be held */
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int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
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{
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struct aa_profile *child;
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struct dentry *dent = NULL, *dir;
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int error;
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if (!parent) {
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struct aa_profile *p;
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p = aa_deref_parent(profile);
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dent = prof_dir(p);
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/* adding to parent that previously didn't have children */
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dent = securityfs_create_dir("profiles", dent);
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if (IS_ERR(dent))
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goto fail;
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prof_child_dir(p) = parent = dent;
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}
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if (!profile->dirname) {
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int len, id_len;
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len = mangle_name(profile->base.name, NULL);
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id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
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profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
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if (!profile->dirname)
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goto fail;
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mangle_name(profile->base.name, profile->dirname);
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sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
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}
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dent = securityfs_create_dir(profile->dirname, parent);
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if (IS_ERR(dent))
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goto fail;
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prof_dir(profile) = dir = dent;
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dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
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if (IS_ERR(dent))
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goto fail;
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profile->dents[AAFS_PROF_NAME] = dent;
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dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
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if (IS_ERR(dent))
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goto fail;
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profile->dents[AAFS_PROF_MODE] = dent;
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dent = create_profile_file(dir, "attach", profile,
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&aa_fs_profattach_fops);
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if (IS_ERR(dent))
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goto fail;
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profile->dents[AAFS_PROF_ATTACH] = dent;
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if (profile->hash) {
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dent = create_profile_file(dir, "sha1", profile,
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&aa_fs_seq_hash_fops);
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if (IS_ERR(dent))
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goto fail;
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profile->dents[AAFS_PROF_HASH] = dent;
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}
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list_for_each_entry(child, &profile->base.profiles, base.list) {
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error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
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if (error)
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goto fail2;
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}
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return 0;
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fail:
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error = PTR_ERR(dent);
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fail2:
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__aa_fs_profile_rmdir(profile);
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return error;
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}
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void __aa_fs_namespace_rmdir(struct aa_namespace *ns)
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{
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struct aa_namespace *sub;
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struct aa_profile *child;
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int i;
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if (!ns)
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return;
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list_for_each_entry(child, &ns->base.profiles, base.list)
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__aa_fs_profile_rmdir(child);
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list_for_each_entry(sub, &ns->sub_ns, base.list) {
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mutex_lock(&sub->lock);
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__aa_fs_namespace_rmdir(sub);
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mutex_unlock(&sub->lock);
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}
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for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
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securityfs_remove(ns->dents[i]);
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ns->dents[i] = NULL;
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}
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}
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int __aa_fs_namespace_mkdir(struct aa_namespace *ns, struct dentry *parent,
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const char *name)
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{
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struct aa_namespace *sub;
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struct aa_profile *child;
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struct dentry *dent, *dir;
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int error;
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if (!name)
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name = ns->base.name;
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dent = securityfs_create_dir(name, parent);
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if (IS_ERR(dent))
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goto fail;
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ns_dir(ns) = dir = dent;
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dent = securityfs_create_dir("profiles", dir);
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if (IS_ERR(dent))
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goto fail;
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ns_subprofs_dir(ns) = dent;
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dent = securityfs_create_dir("namespaces", dir);
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if (IS_ERR(dent))
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goto fail;
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ns_subns_dir(ns) = dent;
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|
|
list_for_each_entry(child, &ns->base.profiles, base.list) {
|
|
error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
|
|
if (error)
|
|
goto fail2;
|
|
}
|
|
|
|
list_for_each_entry(sub, &ns->sub_ns, base.list) {
|
|
mutex_lock(&sub->lock);
|
|
error = __aa_fs_namespace_mkdir(sub, ns_subns_dir(ns), NULL);
|
|
mutex_unlock(&sub->lock);
|
|
if (error)
|
|
goto fail2;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
error = PTR_ERR(dent);
|
|
|
|
fail2:
|
|
__aa_fs_namespace_rmdir(ns);
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
#define list_entry_next(pos, member) \
|
|
list_entry(pos->member.next, typeof(*pos), member)
|
|
#define list_entry_is_head(pos, head, member) (&pos->member == (head))
|
|
|
|
/**
|
|
* __next_namespace - find the next namespace to list
|
|
* @root: root namespace to stop search at (NOT NULL)
|
|
* @ns: current ns position (NOT NULL)
|
|
*
|
|
* Find the next namespace from @ns under @root and handle all locking needed
|
|
* while switching current namespace.
|
|
*
|
|
* Returns: next namespace or NULL if at last namespace under @root
|
|
* Requires: ns->parent->lock to be held
|
|
* NOTE: will not unlock root->lock
|
|
*/
|
|
static struct aa_namespace *__next_namespace(struct aa_namespace *root,
|
|
struct aa_namespace *ns)
|
|
{
|
|
struct aa_namespace *parent, *next;
|
|
|
|
/* is next namespace a child */
|
|
if (!list_empty(&ns->sub_ns)) {
|
|
next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
|
|
mutex_lock(&next->lock);
|
|
return next;
|
|
}
|
|
|
|
/* check if the next ns is a sibling, parent, gp, .. */
|
|
parent = ns->parent;
|
|
while (ns != root) {
|
|
mutex_unlock(&ns->lock);
|
|
next = list_entry_next(ns, base.list);
|
|
if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
|
|
mutex_lock(&next->lock);
|
|
return next;
|
|
}
|
|
ns = parent;
|
|
parent = parent->parent;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __first_profile - find the first profile in a namespace
|
|
* @root: namespace that is root of profiles being displayed (NOT NULL)
|
|
* @ns: namespace to start in (NOT NULL)
|
|
*
|
|
* Returns: unrefcounted profile or NULL if no profile
|
|
* Requires: profile->ns.lock to be held
|
|
*/
|
|
static struct aa_profile *__first_profile(struct aa_namespace *root,
|
|
struct aa_namespace *ns)
|
|
{
|
|
for (; ns; ns = __next_namespace(root, ns)) {
|
|
if (!list_empty(&ns->base.profiles))
|
|
return list_first_entry(&ns->base.profiles,
|
|
struct aa_profile, base.list);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __next_profile - step to the next profile in a profile tree
|
|
* @profile: current profile in tree (NOT NULL)
|
|
*
|
|
* Perform a depth first traversal on the profile tree in a namespace
|
|
*
|
|
* Returns: next profile or NULL if done
|
|
* Requires: profile->ns.lock to be held
|
|
*/
|
|
static struct aa_profile *__next_profile(struct aa_profile *p)
|
|
{
|
|
struct aa_profile *parent;
|
|
struct aa_namespace *ns = p->ns;
|
|
|
|
/* is next profile a child */
|
|
if (!list_empty(&p->base.profiles))
|
|
return list_first_entry(&p->base.profiles, typeof(*p),
|
|
base.list);
|
|
|
|
/* is next profile a sibling, parent sibling, gp, sibling, .. */
|
|
parent = rcu_dereference_protected(p->parent,
|
|
mutex_is_locked(&p->ns->lock));
|
|
while (parent) {
|
|
p = list_entry_next(p, base.list);
|
|
if (!list_entry_is_head(p, &parent->base.profiles, base.list))
|
|
return p;
|
|
p = parent;
|
|
parent = rcu_dereference_protected(parent->parent,
|
|
mutex_is_locked(&parent->ns->lock));
|
|
}
|
|
|
|
/* is next another profile in the namespace */
|
|
p = list_entry_next(p, base.list);
|
|
if (!list_entry_is_head(p, &ns->base.profiles, base.list))
|
|
return p;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* next_profile - step to the next profile in where ever it may be
|
|
* @root: root namespace (NOT NULL)
|
|
* @profile: current profile (NOT NULL)
|
|
*
|
|
* Returns: next profile or NULL if there isn't one
|
|
*/
|
|
static struct aa_profile *next_profile(struct aa_namespace *root,
|
|
struct aa_profile *profile)
|
|
{
|
|
struct aa_profile *next = __next_profile(profile);
|
|
if (next)
|
|
return next;
|
|
|
|
/* finished all profiles in namespace move to next namespace */
|
|
return __first_profile(root, __next_namespace(root, profile->ns));
|
|
}
|
|
|
|
/**
|
|
* p_start - start a depth first traversal of profile tree
|
|
* @f: seq_file to fill
|
|
* @pos: current position
|
|
*
|
|
* Returns: first profile under current namespace or NULL if none found
|
|
*
|
|
* acquires first ns->lock
|
|
*/
|
|
static void *p_start(struct seq_file *f, loff_t *pos)
|
|
{
|
|
struct aa_profile *profile = NULL;
|
|
struct aa_namespace *root = aa_current_profile()->ns;
|
|
loff_t l = *pos;
|
|
f->private = aa_get_namespace(root);
|
|
|
|
|
|
/* find the first profile */
|
|
mutex_lock(&root->lock);
|
|
profile = __first_profile(root, root);
|
|
|
|
/* skip to position */
|
|
for (; profile && l > 0; l--)
|
|
profile = next_profile(root, profile);
|
|
|
|
return profile;
|
|
}
|
|
|
|
/**
|
|
* p_next - read the next profile entry
|
|
* @f: seq_file to fill
|
|
* @p: profile previously returned
|
|
* @pos: current position
|
|
*
|
|
* Returns: next profile after @p or NULL if none
|
|
*
|
|
* may acquire/release locks in namespace tree as necessary
|
|
*/
|
|
static void *p_next(struct seq_file *f, void *p, loff_t *pos)
|
|
{
|
|
struct aa_profile *profile = p;
|
|
struct aa_namespace *ns = f->private;
|
|
(*pos)++;
|
|
|
|
return next_profile(ns, profile);
|
|
}
|
|
|
|
/**
|
|
* p_stop - stop depth first traversal
|
|
* @f: seq_file we are filling
|
|
* @p: the last profile writen
|
|
*
|
|
* Release all locking done by p_start/p_next on namespace tree
|
|
*/
|
|
static void p_stop(struct seq_file *f, void *p)
|
|
{
|
|
struct aa_profile *profile = p;
|
|
struct aa_namespace *root = f->private, *ns;
|
|
|
|
if (profile) {
|
|
for (ns = profile->ns; ns && ns != root; ns = ns->parent)
|
|
mutex_unlock(&ns->lock);
|
|
}
|
|
mutex_unlock(&root->lock);
|
|
aa_put_namespace(root);
|
|
}
|
|
|
|
/**
|
|
* seq_show_profile - show a profile entry
|
|
* @f: seq_file to file
|
|
* @p: current position (profile) (NOT NULL)
|
|
*
|
|
* Returns: error on failure
|
|
*/
|
|
static int seq_show_profile(struct seq_file *f, void *p)
|
|
{
|
|
struct aa_profile *profile = (struct aa_profile *)p;
|
|
struct aa_namespace *root = f->private;
|
|
|
|
if (profile->ns != root)
|
|
seq_printf(f, ":%s://", aa_ns_name(root, profile->ns));
|
|
seq_printf(f, "%s (%s)\n", profile->base.hname,
|
|
aa_profile_mode_names[profile->mode]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations aa_fs_profiles_op = {
|
|
.start = p_start,
|
|
.next = p_next,
|
|
.stop = p_stop,
|
|
.show = seq_show_profile,
|
|
};
|
|
|
|
static int profiles_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &aa_fs_profiles_op);
|
|
}
|
|
|
|
static int profiles_release(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_release(inode, file);
|
|
}
|
|
|
|
static const struct file_operations aa_fs_profiles_fops = {
|
|
.open = profiles_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = profiles_release,
|
|
};
|
|
|
|
|
|
/** Base file system setup **/
|
|
static struct aa_fs_entry aa_fs_entry_file[] = {
|
|
AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
|
|
"link lock"),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_fs_entry aa_fs_entry_domain[] = {
|
|
AA_FS_FILE_BOOLEAN("change_hat", 1),
|
|
AA_FS_FILE_BOOLEAN("change_hatv", 1),
|
|
AA_FS_FILE_BOOLEAN("change_onexec", 1),
|
|
AA_FS_FILE_BOOLEAN("change_profile", 1),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_fs_entry aa_fs_entry_policy[] = {
|
|
AA_FS_FILE_BOOLEAN("set_load", 1),
|
|
{}
|
|
};
|
|
|
|
static struct aa_fs_entry aa_fs_entry_features[] = {
|
|
AA_FS_DIR("policy", aa_fs_entry_policy),
|
|
AA_FS_DIR("domain", aa_fs_entry_domain),
|
|
AA_FS_DIR("file", aa_fs_entry_file),
|
|
AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
|
|
AA_FS_DIR("rlimit", aa_fs_entry_rlimit),
|
|
AA_FS_DIR("caps", aa_fs_entry_caps),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_fs_entry aa_fs_entry_apparmor[] = {
|
|
AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
|
|
AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
|
|
AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
|
|
AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops),
|
|
AA_FS_DIR("features", aa_fs_entry_features),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_fs_entry aa_fs_entry =
|
|
AA_FS_DIR("apparmor", aa_fs_entry_apparmor);
|
|
|
|
/**
|
|
* aafs_create_file - create a file entry in the apparmor securityfs
|
|
* @fs_file: aa_fs_entry to build an entry for (NOT NULL)
|
|
* @parent: the parent dentry in the securityfs
|
|
*
|
|
* Use aafs_remove_file to remove entries created with this fn.
|
|
*/
|
|
static int __init aafs_create_file(struct aa_fs_entry *fs_file,
|
|
struct dentry *parent)
|
|
{
|
|
int error = 0;
|
|
|
|
fs_file->dentry = securityfs_create_file(fs_file->name,
|
|
S_IFREG | fs_file->mode,
|
|
parent, fs_file,
|
|
fs_file->file_ops);
|
|
if (IS_ERR(fs_file->dentry)) {
|
|
error = PTR_ERR(fs_file->dentry);
|
|
fs_file->dentry = NULL;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
|
|
/**
|
|
* aafs_create_dir - recursively create a directory entry in the securityfs
|
|
* @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
|
|
* @parent: the parent dentry in the securityfs
|
|
*
|
|
* Use aafs_remove_dir to remove entries created with this fn.
|
|
*/
|
|
static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
|
|
struct dentry *parent)
|
|
{
|
|
struct aa_fs_entry *fs_file;
|
|
struct dentry *dir;
|
|
int error;
|
|
|
|
dir = securityfs_create_dir(fs_dir->name, parent);
|
|
if (IS_ERR(dir))
|
|
return PTR_ERR(dir);
|
|
fs_dir->dentry = dir;
|
|
|
|
for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
|
|
if (fs_file->v_type == AA_FS_TYPE_DIR)
|
|
error = aafs_create_dir(fs_file, fs_dir->dentry);
|
|
else
|
|
error = aafs_create_file(fs_file, fs_dir->dentry);
|
|
if (error)
|
|
goto failed;
|
|
}
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
aafs_remove_dir(fs_dir);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* aafs_remove_file - drop a single file entry in the apparmor securityfs
|
|
* @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL)
|
|
*/
|
|
static void __init aafs_remove_file(struct aa_fs_entry *fs_file)
|
|
{
|
|
if (!fs_file->dentry)
|
|
return;
|
|
|
|
securityfs_remove(fs_file->dentry);
|
|
fs_file->dentry = NULL;
|
|
}
|
|
|
|
/**
|
|
* aafs_remove_dir - recursively drop a directory entry from the securityfs
|
|
* @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL)
|
|
*/
|
|
static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
|
|
{
|
|
struct aa_fs_entry *fs_file;
|
|
|
|
for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
|
|
if (fs_file->v_type == AA_FS_TYPE_DIR)
|
|
aafs_remove_dir(fs_file);
|
|
else
|
|
aafs_remove_file(fs_file);
|
|
}
|
|
|
|
aafs_remove_file(fs_dir);
|
|
}
|
|
|
|
/**
|
|
* aa_destroy_aafs - cleanup and free aafs
|
|
*
|
|
* releases dentries allocated by aa_create_aafs
|
|
*/
|
|
void __init aa_destroy_aafs(void)
|
|
{
|
|
aafs_remove_dir(&aa_fs_entry);
|
|
}
|
|
|
|
/**
|
|
* aa_create_aafs - create the apparmor security filesystem
|
|
*
|
|
* dentries created here are released by aa_destroy_aafs
|
|
*
|
|
* Returns: error on failure
|
|
*/
|
|
static int __init aa_create_aafs(void)
|
|
{
|
|
int error;
|
|
|
|
if (!apparmor_initialized)
|
|
return 0;
|
|
|
|
if (aa_fs_entry.dentry) {
|
|
AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* Populate fs tree. */
|
|
error = aafs_create_dir(&aa_fs_entry, NULL);
|
|
if (error)
|
|
goto error;
|
|
|
|
error = __aa_fs_namespace_mkdir(root_ns, aa_fs_entry.dentry,
|
|
"policy");
|
|
if (error)
|
|
goto error;
|
|
|
|
/* TODO: add support for apparmorfs_null and apparmorfs_mnt */
|
|
|
|
/* Report that AppArmor fs is enabled */
|
|
aa_info_message("AppArmor Filesystem Enabled");
|
|
return 0;
|
|
|
|
error:
|
|
aa_destroy_aafs();
|
|
AA_ERROR("Error creating AppArmor securityfs\n");
|
|
return error;
|
|
}
|
|
|
|
fs_initcall(aa_create_aafs);
|