![Linus Torvalds](/assets/img/avatar_default.png)
This reverts commit 651e28c553
.
This caused a regression:
"The specific problem is that dnsmasq refuses to start on openSUSE Leap
42.2. The specific cause is that and attempt to open a PF_LOCAL socket
gets EACCES. This means that networking doesn't function on a system
with a 4.14-rc2 system."
Sadly, the developers involved seemed to be in denial for several weeks
about this, delaying the revert. This has not been a good release for
the security subsystem, and this area needs to change development
practices.
Reported-and-bisected-by: James Bottomley <James.Bottomley@hansenpartnership.com>
Tracked-by: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: John Johansen <john.johansen@canonical.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Seth Arnold <seth.arnold@canonical.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2526 lines
61 KiB
C
2526 lines
61 KiB
C
/*
|
|
* AppArmor security module
|
|
*
|
|
* This file contains AppArmor /sys/kernel/security/apparmor interface functions
|
|
*
|
|
* Copyright (C) 1998-2008 Novell/SUSE
|
|
* Copyright 2009-2010 Canonical Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation, version 2 of the
|
|
* License.
|
|
*/
|
|
|
|
#include <linux/ctype.h>
|
|
#include <linux/security.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/module.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/poll.h>
|
|
#include <uapi/linux/major.h>
|
|
#include <uapi/linux/magic.h>
|
|
|
|
#include "include/apparmor.h"
|
|
#include "include/apparmorfs.h"
|
|
#include "include/audit.h"
|
|
#include "include/context.h"
|
|
#include "include/crypto.h"
|
|
#include "include/ipc.h"
|
|
#include "include/policy_ns.h"
|
|
#include "include/label.h"
|
|
#include "include/policy.h"
|
|
#include "include/policy_ns.h"
|
|
#include "include/resource.h"
|
|
#include "include/policy_unpack.h"
|
|
|
|
/*
|
|
* The apparmor filesystem interface used for policy load and introspection
|
|
* The interface is split into two main components based on their function
|
|
* a securityfs component:
|
|
* used for static files that are always available, and which allows
|
|
* userspace to specificy the location of the security filesystem.
|
|
*
|
|
* fns and data are prefixed with
|
|
* aa_sfs_
|
|
*
|
|
* an apparmorfs component:
|
|
* used loaded policy content and introspection. It is not part of a
|
|
* regular mounted filesystem and is available only through the magic
|
|
* policy symlink in the root of the securityfs apparmor/ directory.
|
|
* Tasks queries will be magically redirected to the correct portion
|
|
* of the policy tree based on their confinement.
|
|
*
|
|
* fns and data are prefixed with
|
|
* aafs_
|
|
*
|
|
* The aa_fs_ prefix is used to indicate the fn is used by both the
|
|
* securityfs and apparmorfs filesystems.
|
|
*/
|
|
|
|
|
|
/*
|
|
* support fns
|
|
*/
|
|
|
|
/**
|
|
* aa_mangle_name - mangle a profile name to std profile layout form
|
|
* @name: profile name to mangle (NOT NULL)
|
|
* @target: buffer to store mangled name, same length as @name (MAYBE NULL)
|
|
*
|
|
* Returns: length of mangled name
|
|
*/
|
|
static int mangle_name(const char *name, char *target)
|
|
{
|
|
char *t = target;
|
|
|
|
while (*name == '/' || *name == '.')
|
|
name++;
|
|
|
|
if (target) {
|
|
for (; *name; name++) {
|
|
if (*name == '/')
|
|
*(t)++ = '.';
|
|
else if (isspace(*name))
|
|
*(t)++ = '_';
|
|
else if (isalnum(*name) || strchr("._-", *name))
|
|
*(t)++ = *name;
|
|
}
|
|
|
|
*t = 0;
|
|
} else {
|
|
int len = 0;
|
|
for (; *name; name++) {
|
|
if (isalnum(*name) || isspace(*name) ||
|
|
strchr("/._-", *name))
|
|
len++;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
return t - target;
|
|
}
|
|
|
|
|
|
/*
|
|
* aafs - core fns and data for the policy tree
|
|
*/
|
|
|
|
#define AAFS_NAME "apparmorfs"
|
|
static struct vfsmount *aafs_mnt;
|
|
static int aafs_count;
|
|
|
|
|
|
static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino);
|
|
return 0;
|
|
}
|
|
|
|
static void aafs_evict_inode(struct inode *inode)
|
|
{
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
clear_inode(inode);
|
|
if (S_ISLNK(inode->i_mode))
|
|
kfree(inode->i_link);
|
|
}
|
|
|
|
static const struct super_operations aafs_super_ops = {
|
|
.statfs = simple_statfs,
|
|
.evict_inode = aafs_evict_inode,
|
|
.show_path = aafs_show_path,
|
|
};
|
|
|
|
static int fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
static struct tree_descr files[] = { {""} };
|
|
int error;
|
|
|
|
error = simple_fill_super(sb, AAFS_MAGIC, files);
|
|
if (error)
|
|
return error;
|
|
sb->s_op = &aafs_super_ops;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dentry *aafs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_single(fs_type, flags, data, fill_super);
|
|
}
|
|
|
|
static struct file_system_type aafs_ops = {
|
|
.owner = THIS_MODULE,
|
|
.name = AAFS_NAME,
|
|
.mount = aafs_mount,
|
|
.kill_sb = kill_anon_super,
|
|
};
|
|
|
|
/**
|
|
* __aafs_setup_d_inode - basic inode setup for apparmorfs
|
|
* @dir: parent directory for the dentry
|
|
* @dentry: dentry we are seting the inode up for
|
|
* @mode: permissions the file should have
|
|
* @data: data to store on inode.i_private, available in open()
|
|
* @link: if symlink, symlink target string
|
|
* @fops: struct file_operations that should be used
|
|
* @iops: struct of inode_operations that should be used
|
|
*/
|
|
static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode, void *data, char *link,
|
|
const struct file_operations *fops,
|
|
const struct inode_operations *iops)
|
|
{
|
|
struct inode *inode = new_inode(dir->i_sb);
|
|
|
|
AA_BUG(!dir);
|
|
AA_BUG(!dentry);
|
|
|
|
if (!inode)
|
|
return -ENOMEM;
|
|
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mode = mode;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
|
|
inode->i_private = data;
|
|
if (S_ISDIR(mode)) {
|
|
inode->i_op = iops ? iops : &simple_dir_inode_operations;
|
|
inode->i_fop = &simple_dir_operations;
|
|
inc_nlink(inode);
|
|
inc_nlink(dir);
|
|
} else if (S_ISLNK(mode)) {
|
|
inode->i_op = iops ? iops : &simple_symlink_inode_operations;
|
|
inode->i_link = link;
|
|
} else {
|
|
inode->i_fop = fops;
|
|
}
|
|
d_instantiate(dentry, inode);
|
|
dget(dentry);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* aafs_create - create a dentry in the apparmorfs filesystem
|
|
*
|
|
* @name: name of dentry to create
|
|
* @mode: permissions the file should have
|
|
* @parent: parent directory for this dentry
|
|
* @data: data to store on inode.i_private, available in open()
|
|
* @link: if symlink, symlink target string
|
|
* @fops: struct file_operations that should be used for
|
|
* @iops: struct of inode_operations that should be used
|
|
*
|
|
* This is the basic "create a xxx" function for apparmorfs.
|
|
*
|
|
* Returns a pointer to a dentry if it succeeds, that must be free with
|
|
* aafs_remove(). Will return ERR_PTR on failure.
|
|
*/
|
|
static struct dentry *aafs_create(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data, void *link,
|
|
const struct file_operations *fops,
|
|
const struct inode_operations *iops)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *dir;
|
|
int error;
|
|
|
|
AA_BUG(!name);
|
|
AA_BUG(!parent);
|
|
|
|
if (!(mode & S_IFMT))
|
|
mode = (mode & S_IALLUGO) | S_IFREG;
|
|
|
|
error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
|
|
dir = d_inode(parent);
|
|
|
|
inode_lock(dir);
|
|
dentry = lookup_one_len(name, parent, strlen(name));
|
|
if (IS_ERR(dentry)) {
|
|
error = PTR_ERR(dentry);
|
|
goto fail_lock;
|
|
}
|
|
|
|
if (d_really_is_positive(dentry)) {
|
|
error = -EEXIST;
|
|
goto fail_dentry;
|
|
}
|
|
|
|
error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
|
|
if (error)
|
|
goto fail_dentry;
|
|
inode_unlock(dir);
|
|
|
|
return dentry;
|
|
|
|
fail_dentry:
|
|
dput(dentry);
|
|
|
|
fail_lock:
|
|
inode_unlock(dir);
|
|
simple_release_fs(&aafs_mnt, &aafs_count);
|
|
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/**
|
|
* aafs_create_file - create a file in the apparmorfs filesystem
|
|
*
|
|
* @name: name of dentry to create
|
|
* @mode: permissions the file should have
|
|
* @parent: parent directory for this dentry
|
|
* @data: data to store on inode.i_private, available in open()
|
|
* @fops: struct file_operations that should be used for
|
|
*
|
|
* see aafs_create
|
|
*/
|
|
static struct dentry *aafs_create_file(const char *name, umode_t mode,
|
|
struct dentry *parent, void *data,
|
|
const struct file_operations *fops)
|
|
{
|
|
return aafs_create(name, mode, parent, data, NULL, fops, NULL);
|
|
}
|
|
|
|
/**
|
|
* aafs_create_dir - create a directory in the apparmorfs filesystem
|
|
*
|
|
* @name: name of dentry to create
|
|
* @parent: parent directory for this dentry
|
|
*
|
|
* see aafs_create
|
|
*/
|
|
static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
|
|
{
|
|
return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
|
|
NULL);
|
|
}
|
|
|
|
/**
|
|
* aafs_create_symlink - create a symlink in the apparmorfs filesystem
|
|
* @name: name of dentry to create
|
|
* @parent: parent directory for this dentry
|
|
* @target: if symlink, symlink target string
|
|
* @iops: struct of inode_operations that should be used
|
|
*
|
|
* If @target parameter is %NULL, then the @iops parameter needs to be
|
|
* setup to handle .readlink and .get_link inode_operations.
|
|
*/
|
|
static struct dentry *aafs_create_symlink(const char *name,
|
|
struct dentry *parent,
|
|
const char *target,
|
|
const struct inode_operations *iops)
|
|
{
|
|
struct dentry *dent;
|
|
char *link = NULL;
|
|
|
|
if (target) {
|
|
link = kstrdup(target, GFP_KERNEL);
|
|
if (!link)
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL,
|
|
iops);
|
|
if (IS_ERR(dent))
|
|
kfree(link);
|
|
|
|
return dent;
|
|
}
|
|
|
|
/**
|
|
* aafs_remove - removes a file or directory from the apparmorfs filesystem
|
|
*
|
|
* @dentry: dentry of the file/directory/symlink to removed.
|
|
*/
|
|
static void aafs_remove(struct dentry *dentry)
|
|
{
|
|
struct inode *dir;
|
|
|
|
if (!dentry || IS_ERR(dentry))
|
|
return;
|
|
|
|
dir = d_inode(dentry->d_parent);
|
|
inode_lock(dir);
|
|
if (simple_positive(dentry)) {
|
|
if (d_is_dir(dentry))
|
|
simple_rmdir(dir, dentry);
|
|
else
|
|
simple_unlink(dir, dentry);
|
|
dput(dentry);
|
|
}
|
|
inode_unlock(dir);
|
|
simple_release_fs(&aafs_mnt, &aafs_count);
|
|
}
|
|
|
|
|
|
/*
|
|
* aa_fs - policy load/replace/remove
|
|
*/
|
|
|
|
/**
|
|
* aa_simple_write_to_buffer - common routine for getting policy from user
|
|
* @userbuf: user buffer to copy data from (NOT NULL)
|
|
* @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
|
|
* @copy_size: size of data to copy from user buffer
|
|
* @pos: position write is at in the file (NOT NULL)
|
|
*
|
|
* Returns: kernel buffer containing copy of user buffer data or an
|
|
* ERR_PTR on failure.
|
|
*/
|
|
static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
|
|
size_t alloc_size,
|
|
size_t copy_size,
|
|
loff_t *pos)
|
|
{
|
|
struct aa_loaddata *data;
|
|
|
|
AA_BUG(copy_size > alloc_size);
|
|
|
|
if (*pos != 0)
|
|
/* only writes from pos 0, that is complete writes */
|
|
return ERR_PTR(-ESPIPE);
|
|
|
|
/* freed by caller to simple_write_to_buffer */
|
|
data = aa_loaddata_alloc(alloc_size);
|
|
if (IS_ERR(data))
|
|
return data;
|
|
|
|
data->size = copy_size;
|
|
if (copy_from_user(data->data, userbuf, copy_size)) {
|
|
kvfree(data);
|
|
return ERR_PTR(-EFAULT);
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
|
|
loff_t *pos, struct aa_ns *ns)
|
|
{
|
|
struct aa_loaddata *data;
|
|
struct aa_label *label;
|
|
ssize_t error;
|
|
|
|
label = begin_current_label_crit_section();
|
|
|
|
/* high level check about policy management - fine grained in
|
|
* below after unpack
|
|
*/
|
|
error = aa_may_manage_policy(label, ns, mask);
|
|
if (error)
|
|
return error;
|
|
|
|
data = aa_simple_write_to_buffer(buf, size, size, pos);
|
|
error = PTR_ERR(data);
|
|
if (!IS_ERR(data)) {
|
|
error = aa_replace_profiles(ns, label, mask, data);
|
|
aa_put_loaddata(data);
|
|
}
|
|
end_current_label_crit_section(label);
|
|
|
|
return error;
|
|
}
|
|
|
|
/* .load file hook fn to load policy */
|
|
static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
|
|
loff_t *pos)
|
|
{
|
|
struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
|
|
int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
|
|
|
|
aa_put_ns(ns);
|
|
|
|
return error;
|
|
}
|
|
|
|
static const struct file_operations aa_fs_profile_load = {
|
|
.write = profile_load,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/* .replace file hook fn to load and/or replace policy */
|
|
static ssize_t profile_replace(struct file *f, const char __user *buf,
|
|
size_t size, loff_t *pos)
|
|
{
|
|
struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
|
|
int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
|
|
buf, size, pos, ns);
|
|
aa_put_ns(ns);
|
|
|
|
return error;
|
|
}
|
|
|
|
static const struct file_operations aa_fs_profile_replace = {
|
|
.write = profile_replace,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
/* .remove file hook fn to remove loaded policy */
|
|
static ssize_t profile_remove(struct file *f, const char __user *buf,
|
|
size_t size, loff_t *pos)
|
|
{
|
|
struct aa_loaddata *data;
|
|
struct aa_label *label;
|
|
ssize_t error;
|
|
struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
|
|
|
|
label = begin_current_label_crit_section();
|
|
/* high level check about policy management - fine grained in
|
|
* below after unpack
|
|
*/
|
|
error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* aa_remove_profile needs a null terminated string so 1 extra
|
|
* byte is allocated and the copied data is null terminated.
|
|
*/
|
|
data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
|
|
|
|
error = PTR_ERR(data);
|
|
if (!IS_ERR(data)) {
|
|
data->data[size] = 0;
|
|
error = aa_remove_profiles(ns, label, data->data, size);
|
|
aa_put_loaddata(data);
|
|
}
|
|
out:
|
|
end_current_label_crit_section(label);
|
|
aa_put_ns(ns);
|
|
return error;
|
|
}
|
|
|
|
static const struct file_operations aa_fs_profile_remove = {
|
|
.write = profile_remove,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
struct aa_revision {
|
|
struct aa_ns *ns;
|
|
long last_read;
|
|
};
|
|
|
|
/* revision file hook fn for policy loads */
|
|
static int ns_revision_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct aa_revision *rev = file->private_data;
|
|
|
|
if (rev) {
|
|
aa_put_ns(rev->ns);
|
|
kfree(rev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ns_revision_read(struct file *file, char __user *buf,
|
|
size_t size, loff_t *ppos)
|
|
{
|
|
struct aa_revision *rev = file->private_data;
|
|
char buffer[32];
|
|
long last_read;
|
|
int avail;
|
|
|
|
mutex_lock(&rev->ns->lock);
|
|
last_read = rev->last_read;
|
|
if (last_read == rev->ns->revision) {
|
|
mutex_unlock(&rev->ns->lock);
|
|
if (file->f_flags & O_NONBLOCK)
|
|
return -EAGAIN;
|
|
if (wait_event_interruptible(rev->ns->wait,
|
|
last_read !=
|
|
READ_ONCE(rev->ns->revision)))
|
|
return -ERESTARTSYS;
|
|
mutex_lock(&rev->ns->lock);
|
|
}
|
|
|
|
avail = sprintf(buffer, "%ld\n", rev->ns->revision);
|
|
if (*ppos + size > avail) {
|
|
rev->last_read = rev->ns->revision;
|
|
*ppos = 0;
|
|
}
|
|
mutex_unlock(&rev->ns->lock);
|
|
|
|
return simple_read_from_buffer(buf, size, ppos, buffer, avail);
|
|
}
|
|
|
|
static int ns_revision_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
|
|
|
|
if (!rev)
|
|
return -ENOMEM;
|
|
|
|
rev->ns = aa_get_ns(inode->i_private);
|
|
if (!rev->ns)
|
|
rev->ns = aa_get_current_ns();
|
|
file->private_data = rev;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int ns_revision_poll(struct file *file, poll_table *pt)
|
|
{
|
|
struct aa_revision *rev = file->private_data;
|
|
unsigned int mask = 0;
|
|
|
|
if (rev) {
|
|
mutex_lock(&rev->ns->lock);
|
|
poll_wait(file, &rev->ns->wait, pt);
|
|
if (rev->last_read < rev->ns->revision)
|
|
mask |= POLLIN | POLLRDNORM;
|
|
mutex_unlock(&rev->ns->lock);
|
|
}
|
|
|
|
return mask;
|
|
}
|
|
|
|
void __aa_bump_ns_revision(struct aa_ns *ns)
|
|
{
|
|
ns->revision++;
|
|
wake_up_interruptible(&ns->wait);
|
|
}
|
|
|
|
static const struct file_operations aa_fs_ns_revision_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ns_revision_open,
|
|
.poll = ns_revision_poll,
|
|
.read = ns_revision_read,
|
|
.llseek = generic_file_llseek,
|
|
.release = ns_revision_release,
|
|
};
|
|
|
|
static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
|
|
const char *match_str, size_t match_len)
|
|
{
|
|
struct aa_perms tmp;
|
|
struct aa_dfa *dfa;
|
|
unsigned int state = 0;
|
|
|
|
if (profile_unconfined(profile))
|
|
return;
|
|
if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
|
|
dfa = profile->file.dfa;
|
|
state = aa_dfa_match_len(dfa, profile->file.start,
|
|
match_str + 1, match_len - 1);
|
|
tmp = nullperms;
|
|
if (state) {
|
|
struct path_cond cond = { };
|
|
|
|
tmp = aa_compute_fperms(dfa, state, &cond);
|
|
}
|
|
} else if (profile->policy.dfa) {
|
|
if (!PROFILE_MEDIATES_SAFE(profile, *match_str))
|
|
return; /* no change to current perms */
|
|
dfa = profile->policy.dfa;
|
|
state = aa_dfa_match_len(dfa, profile->policy.start[0],
|
|
match_str, match_len);
|
|
if (state)
|
|
aa_compute_perms(dfa, state, &tmp);
|
|
else
|
|
tmp = nullperms;
|
|
}
|
|
aa_apply_modes_to_perms(profile, &tmp);
|
|
aa_perms_accum_raw(perms, &tmp);
|
|
}
|
|
|
|
|
|
/**
|
|
* query_data - queries a policy and writes its data to buf
|
|
* @buf: the resulting data is stored here (NOT NULL)
|
|
* @buf_len: size of buf
|
|
* @query: query string used to retrieve data
|
|
* @query_len: size of query including second NUL byte
|
|
*
|
|
* The buffers pointed to by buf and query may overlap. The query buffer is
|
|
* parsed before buf is written to.
|
|
*
|
|
* The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
|
|
* the security confinement context and <KEY> is the name of the data to
|
|
* retrieve. <LABEL> and <KEY> must not be NUL-terminated.
|
|
*
|
|
* Don't expect the contents of buf to be preserved on failure.
|
|
*
|
|
* Returns: number of characters written to buf or -errno on failure
|
|
*/
|
|
static ssize_t query_data(char *buf, size_t buf_len,
|
|
char *query, size_t query_len)
|
|
{
|
|
char *out;
|
|
const char *key;
|
|
struct label_it i;
|
|
struct aa_label *label, *curr;
|
|
struct aa_profile *profile;
|
|
struct aa_data *data;
|
|
u32 bytes, blocks;
|
|
__le32 outle32;
|
|
|
|
if (!query_len)
|
|
return -EINVAL; /* need a query */
|
|
|
|
key = query + strnlen(query, query_len) + 1;
|
|
if (key + 1 >= query + query_len)
|
|
return -EINVAL; /* not enough space for a non-empty key */
|
|
if (key + strnlen(key, query + query_len - key) >= query + query_len)
|
|
return -EINVAL; /* must end with NUL */
|
|
|
|
if (buf_len < sizeof(bytes) + sizeof(blocks))
|
|
return -EINVAL; /* not enough space */
|
|
|
|
curr = begin_current_label_crit_section();
|
|
label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
|
|
end_current_label_crit_section(curr);
|
|
if (IS_ERR(label))
|
|
return PTR_ERR(label);
|
|
|
|
/* We are going to leave space for two numbers. The first is the total
|
|
* number of bytes we are writing after the first number. This is so
|
|
* users can read the full output without reallocation.
|
|
*
|
|
* The second number is the number of data blocks we're writing. An
|
|
* application might be confined by multiple policies having data in
|
|
* the same key.
|
|
*/
|
|
memset(buf, 0, sizeof(bytes) + sizeof(blocks));
|
|
out = buf + sizeof(bytes) + sizeof(blocks);
|
|
|
|
blocks = 0;
|
|
label_for_each_confined(i, label, profile) {
|
|
if (!profile->data)
|
|
continue;
|
|
|
|
data = rhashtable_lookup_fast(profile->data, &key,
|
|
profile->data->p);
|
|
|
|
if (data) {
|
|
if (out + sizeof(outle32) + data->size > buf +
|
|
buf_len) {
|
|
aa_put_label(label);
|
|
return -EINVAL; /* not enough space */
|
|
}
|
|
outle32 = __cpu_to_le32(data->size);
|
|
memcpy(out, &outle32, sizeof(outle32));
|
|
out += sizeof(outle32);
|
|
memcpy(out, data->data, data->size);
|
|
out += data->size;
|
|
blocks++;
|
|
}
|
|
}
|
|
aa_put_label(label);
|
|
|
|
outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
|
|
memcpy(buf, &outle32, sizeof(outle32));
|
|
outle32 = __cpu_to_le32(blocks);
|
|
memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
|
|
|
|
return out - buf;
|
|
}
|
|
|
|
/**
|
|
* query_label - queries a label and writes permissions to buf
|
|
* @buf: the resulting permissions string is stored here (NOT NULL)
|
|
* @buf_len: size of buf
|
|
* @query: binary query string to match against the dfa
|
|
* @query_len: size of query
|
|
* @view_only: only compute for querier's view
|
|
*
|
|
* The buffers pointed to by buf and query may overlap. The query buffer is
|
|
* parsed before buf is written to.
|
|
*
|
|
* The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
|
|
* the name of the label, in the current namespace, that is to be queried and
|
|
* DFA_STRING is a binary string to match against the label(s)'s DFA.
|
|
*
|
|
* LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
|
|
* but must *not* be NUL terminated.
|
|
*
|
|
* Returns: number of characters written to buf or -errno on failure
|
|
*/
|
|
static ssize_t query_label(char *buf, size_t buf_len,
|
|
char *query, size_t query_len, bool view_only)
|
|
{
|
|
struct aa_profile *profile;
|
|
struct aa_label *label, *curr;
|
|
char *label_name, *match_str;
|
|
size_t label_name_len, match_len;
|
|
struct aa_perms perms;
|
|
struct label_it i;
|
|
|
|
if (!query_len)
|
|
return -EINVAL;
|
|
|
|
label_name = query;
|
|
label_name_len = strnlen(query, query_len);
|
|
if (!label_name_len || label_name_len == query_len)
|
|
return -EINVAL;
|
|
|
|
/**
|
|
* The extra byte is to account for the null byte between the
|
|
* profile name and dfa string. profile_name_len is greater
|
|
* than zero and less than query_len, so a byte can be safely
|
|
* added or subtracted.
|
|
*/
|
|
match_str = label_name + label_name_len + 1;
|
|
match_len = query_len - label_name_len - 1;
|
|
|
|
curr = begin_current_label_crit_section();
|
|
label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
|
|
end_current_label_crit_section(curr);
|
|
if (IS_ERR(label))
|
|
return PTR_ERR(label);
|
|
|
|
perms = allperms;
|
|
if (view_only) {
|
|
label_for_each_in_ns(i, labels_ns(label), label, profile) {
|
|
profile_query_cb(profile, &perms, match_str, match_len);
|
|
}
|
|
} else {
|
|
label_for_each(i, label, profile) {
|
|
profile_query_cb(profile, &perms, match_str, match_len);
|
|
}
|
|
}
|
|
aa_put_label(label);
|
|
|
|
return scnprintf(buf, buf_len,
|
|
"allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
|
|
perms.allow, perms.deny, perms.audit, perms.quiet);
|
|
}
|
|
|
|
/*
|
|
* Transaction based IO.
|
|
* The file expects a write which triggers the transaction, and then
|
|
* possibly a read(s) which collects the result - which is stored in a
|
|
* file-local buffer. Once a new write is performed, a new set of results
|
|
* are stored in the file-local buffer.
|
|
*/
|
|
struct multi_transaction {
|
|
struct kref count;
|
|
ssize_t size;
|
|
char data[0];
|
|
};
|
|
|
|
#define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
|
|
/* TODO: replace with per file lock */
|
|
static DEFINE_SPINLOCK(multi_transaction_lock);
|
|
|
|
static void multi_transaction_kref(struct kref *kref)
|
|
{
|
|
struct multi_transaction *t;
|
|
|
|
t = container_of(kref, struct multi_transaction, count);
|
|
free_page((unsigned long) t);
|
|
}
|
|
|
|
static struct multi_transaction *
|
|
get_multi_transaction(struct multi_transaction *t)
|
|
{
|
|
if (t)
|
|
kref_get(&(t->count));
|
|
|
|
return t;
|
|
}
|
|
|
|
static void put_multi_transaction(struct multi_transaction *t)
|
|
{
|
|
if (t)
|
|
kref_put(&(t->count), multi_transaction_kref);
|
|
}
|
|
|
|
/* does not increment @new's count */
|
|
static void multi_transaction_set(struct file *file,
|
|
struct multi_transaction *new, size_t n)
|
|
{
|
|
struct multi_transaction *old;
|
|
|
|
AA_BUG(n > MULTI_TRANSACTION_LIMIT);
|
|
|
|
new->size = n;
|
|
spin_lock(&multi_transaction_lock);
|
|
old = (struct multi_transaction *) file->private_data;
|
|
file->private_data = new;
|
|
spin_unlock(&multi_transaction_lock);
|
|
put_multi_transaction(old);
|
|
}
|
|
|
|
static struct multi_transaction *multi_transaction_new(struct file *file,
|
|
const char __user *buf,
|
|
size_t size)
|
|
{
|
|
struct multi_transaction *t;
|
|
|
|
if (size > MULTI_TRANSACTION_LIMIT - 1)
|
|
return ERR_PTR(-EFBIG);
|
|
|
|
t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
|
|
if (!t)
|
|
return ERR_PTR(-ENOMEM);
|
|
kref_init(&t->count);
|
|
if (copy_from_user(t->data, buf, size))
|
|
return ERR_PTR(-EFAULT);
|
|
|
|
return t;
|
|
}
|
|
|
|
static ssize_t multi_transaction_read(struct file *file, char __user *buf,
|
|
size_t size, loff_t *pos)
|
|
{
|
|
struct multi_transaction *t;
|
|
ssize_t ret;
|
|
|
|
spin_lock(&multi_transaction_lock);
|
|
t = get_multi_transaction(file->private_data);
|
|
spin_unlock(&multi_transaction_lock);
|
|
if (!t)
|
|
return 0;
|
|
|
|
ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
|
|
put_multi_transaction(t);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int multi_transaction_release(struct inode *inode, struct file *file)
|
|
{
|
|
put_multi_transaction(file->private_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define QUERY_CMD_LABEL "label\0"
|
|
#define QUERY_CMD_LABEL_LEN 6
|
|
#define QUERY_CMD_PROFILE "profile\0"
|
|
#define QUERY_CMD_PROFILE_LEN 8
|
|
#define QUERY_CMD_LABELALL "labelall\0"
|
|
#define QUERY_CMD_LABELALL_LEN 9
|
|
#define QUERY_CMD_DATA "data\0"
|
|
#define QUERY_CMD_DATA_LEN 5
|
|
|
|
/**
|
|
* aa_write_access - generic permissions and data query
|
|
* @file: pointer to open apparmorfs/access file
|
|
* @ubuf: user buffer containing the complete query string (NOT NULL)
|
|
* @count: size of ubuf
|
|
* @ppos: position in the file (MUST BE ZERO)
|
|
*
|
|
* Allows for one permissions or data query per open(), write(), and read()
|
|
* sequence. The only queries currently supported are label-based queries for
|
|
* permissions or data.
|
|
*
|
|
* For permissions queries, ubuf must begin with "label\0", followed by the
|
|
* profile query specific format described in the query_label() function
|
|
* documentation.
|
|
*
|
|
* For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
|
|
* <LABEL> is the name of the security confinement context and <KEY> is the
|
|
* name of the data to retrieve.
|
|
*
|
|
* Returns: number of bytes written or -errno on failure
|
|
*/
|
|
static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct multi_transaction *t;
|
|
ssize_t len;
|
|
|
|
if (*ppos)
|
|
return -ESPIPE;
|
|
|
|
t = multi_transaction_new(file, ubuf, count);
|
|
if (IS_ERR(t))
|
|
return PTR_ERR(t);
|
|
|
|
if (count > QUERY_CMD_PROFILE_LEN &&
|
|
!memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
|
|
len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
|
|
t->data + QUERY_CMD_PROFILE_LEN,
|
|
count - QUERY_CMD_PROFILE_LEN, true);
|
|
} else if (count > QUERY_CMD_LABEL_LEN &&
|
|
!memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
|
|
len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
|
|
t->data + QUERY_CMD_LABEL_LEN,
|
|
count - QUERY_CMD_LABEL_LEN, true);
|
|
} else if (count > QUERY_CMD_LABELALL_LEN &&
|
|
!memcmp(t->data, QUERY_CMD_LABELALL,
|
|
QUERY_CMD_LABELALL_LEN)) {
|
|
len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
|
|
t->data + QUERY_CMD_LABELALL_LEN,
|
|
count - QUERY_CMD_LABELALL_LEN, false);
|
|
} else if (count > QUERY_CMD_DATA_LEN &&
|
|
!memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
|
|
len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
|
|
t->data + QUERY_CMD_DATA_LEN,
|
|
count - QUERY_CMD_DATA_LEN);
|
|
} else
|
|
len = -EINVAL;
|
|
|
|
if (len < 0) {
|
|
put_multi_transaction(t);
|
|
return len;
|
|
}
|
|
|
|
multi_transaction_set(file, t, len);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations aa_sfs_access = {
|
|
.write = aa_write_access,
|
|
.read = multi_transaction_read,
|
|
.release = multi_transaction_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int aa_sfs_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_sfs_entry *fs_file = seq->private;
|
|
|
|
if (!fs_file)
|
|
return 0;
|
|
|
|
switch (fs_file->v_type) {
|
|
case AA_SFS_TYPE_BOOLEAN:
|
|
seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
|
|
break;
|
|
case AA_SFS_TYPE_STRING:
|
|
seq_printf(seq, "%s\n", fs_file->v.string);
|
|
break;
|
|
case AA_SFS_TYPE_U64:
|
|
seq_printf(seq, "%#08lx\n", fs_file->v.u64);
|
|
break;
|
|
default:
|
|
/* Ignore unpritable entry types. */
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int aa_sfs_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, aa_sfs_seq_show, inode->i_private);
|
|
}
|
|
|
|
const struct file_operations aa_sfs_seq_file_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = aa_sfs_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
/*
|
|
* profile based file operations
|
|
* policy/profiles/XXXX/profiles/ *
|
|
*/
|
|
|
|
#define SEQ_PROFILE_FOPS(NAME) \
|
|
static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
|
|
{ \
|
|
return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
|
|
} \
|
|
\
|
|
static const struct file_operations seq_profile_ ##NAME ##_fops = { \
|
|
.owner = THIS_MODULE, \
|
|
.open = seq_profile_ ##NAME ##_open, \
|
|
.read = seq_read, \
|
|
.llseek = seq_lseek, \
|
|
.release = seq_profile_release, \
|
|
} \
|
|
|
|
static int seq_profile_open(struct inode *inode, struct file *file,
|
|
int (*show)(struct seq_file *, void *))
|
|
{
|
|
struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
|
|
int error = single_open(file, show, proxy);
|
|
|
|
if (error) {
|
|
file->private_data = NULL;
|
|
aa_put_proxy(proxy);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int seq_profile_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = (struct seq_file *) file->private_data;
|
|
if (seq)
|
|
aa_put_proxy(seq->private);
|
|
return single_release(inode, file);
|
|
}
|
|
|
|
static int seq_profile_name_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_proxy *proxy = seq->private;
|
|
struct aa_label *label = aa_get_label_rcu(&proxy->label);
|
|
struct aa_profile *profile = labels_profile(label);
|
|
seq_printf(seq, "%s\n", profile->base.name);
|
|
aa_put_label(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_profile_mode_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_proxy *proxy = seq->private;
|
|
struct aa_label *label = aa_get_label_rcu(&proxy->label);
|
|
struct aa_profile *profile = labels_profile(label);
|
|
seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
|
|
aa_put_label(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_profile_attach_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_proxy *proxy = seq->private;
|
|
struct aa_label *label = aa_get_label_rcu(&proxy->label);
|
|
struct aa_profile *profile = labels_profile(label);
|
|
if (profile->attach)
|
|
seq_printf(seq, "%s\n", profile->attach);
|
|
else if (profile->xmatch)
|
|
seq_puts(seq, "<unknown>\n");
|
|
else
|
|
seq_printf(seq, "%s\n", profile->base.name);
|
|
aa_put_label(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_profile_hash_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_proxy *proxy = seq->private;
|
|
struct aa_label *label = aa_get_label_rcu(&proxy->label);
|
|
struct aa_profile *profile = labels_profile(label);
|
|
unsigned int i, size = aa_hash_size();
|
|
|
|
if (profile->hash) {
|
|
for (i = 0; i < size; i++)
|
|
seq_printf(seq, "%.2x", profile->hash[i]);
|
|
seq_putc(seq, '\n');
|
|
}
|
|
aa_put_label(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
SEQ_PROFILE_FOPS(name);
|
|
SEQ_PROFILE_FOPS(mode);
|
|
SEQ_PROFILE_FOPS(attach);
|
|
SEQ_PROFILE_FOPS(hash);
|
|
|
|
/*
|
|
* namespace based files
|
|
* several root files and
|
|
* policy/ *
|
|
*/
|
|
|
|
#define SEQ_NS_FOPS(NAME) \
|
|
static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
|
|
{ \
|
|
return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
|
|
} \
|
|
\
|
|
static const struct file_operations seq_ns_ ##NAME ##_fops = { \
|
|
.owner = THIS_MODULE, \
|
|
.open = seq_ns_ ##NAME ##_open, \
|
|
.read = seq_read, \
|
|
.llseek = seq_lseek, \
|
|
.release = single_release, \
|
|
} \
|
|
|
|
static int seq_ns_stacked_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_label *label;
|
|
|
|
label = begin_current_label_crit_section();
|
|
seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
|
|
end_current_label_crit_section(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_label *label;
|
|
struct aa_profile *profile;
|
|
struct label_it it;
|
|
int count = 1;
|
|
|
|
label = begin_current_label_crit_section();
|
|
|
|
if (label->size > 1) {
|
|
label_for_each(it, label, profile)
|
|
if (profile->ns != labels_ns(label)) {
|
|
count++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
|
|
end_current_label_crit_section(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_ns_level_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_label *label;
|
|
|
|
label = begin_current_label_crit_section();
|
|
seq_printf(seq, "%d\n", labels_ns(label)->level);
|
|
end_current_label_crit_section(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_ns_name_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_label *label = begin_current_label_crit_section();
|
|
|
|
seq_printf(seq, "%s\n", aa_ns_name(labels_ns(label),
|
|
labels_ns(label), true));
|
|
end_current_label_crit_section(label);
|
|
|
|
return 0;
|
|
}
|
|
|
|
SEQ_NS_FOPS(stacked);
|
|
SEQ_NS_FOPS(nsstacked);
|
|
SEQ_NS_FOPS(level);
|
|
SEQ_NS_FOPS(name);
|
|
|
|
|
|
/* policy/raw_data/ * file ops */
|
|
|
|
#define SEQ_RAWDATA_FOPS(NAME) \
|
|
static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
|
|
{ \
|
|
return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
|
|
} \
|
|
\
|
|
static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
|
|
.owner = THIS_MODULE, \
|
|
.open = seq_rawdata_ ##NAME ##_open, \
|
|
.read = seq_read, \
|
|
.llseek = seq_lseek, \
|
|
.release = seq_rawdata_release, \
|
|
} \
|
|
|
|
static int seq_rawdata_open(struct inode *inode, struct file *file,
|
|
int (*show)(struct seq_file *, void *))
|
|
{
|
|
struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
|
|
int error;
|
|
|
|
if (!data)
|
|
/* lost race this ent is being reaped */
|
|
return -ENOENT;
|
|
|
|
error = single_open(file, show, data);
|
|
if (error) {
|
|
AA_BUG(file->private_data &&
|
|
((struct seq_file *)file->private_data)->private);
|
|
aa_put_loaddata(data);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int seq_rawdata_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *seq = (struct seq_file *) file->private_data;
|
|
|
|
if (seq)
|
|
aa_put_loaddata(seq->private);
|
|
|
|
return single_release(inode, file);
|
|
}
|
|
|
|
static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_loaddata *data = seq->private;
|
|
|
|
seq_printf(seq, "v%d\n", data->abi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_loaddata *data = seq->private;
|
|
|
|
seq_printf(seq, "%ld\n", data->revision);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct aa_loaddata *data = seq->private;
|
|
unsigned int i, size = aa_hash_size();
|
|
|
|
if (data->hash) {
|
|
for (i = 0; i < size; i++)
|
|
seq_printf(seq, "%.2x", data->hash[i]);
|
|
seq_putc(seq, '\n');
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
SEQ_RAWDATA_FOPS(abi);
|
|
SEQ_RAWDATA_FOPS(revision);
|
|
SEQ_RAWDATA_FOPS(hash);
|
|
|
|
static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
|
|
loff_t *ppos)
|
|
{
|
|
struct aa_loaddata *rawdata = file->private_data;
|
|
|
|
return simple_read_from_buffer(buf, size, ppos, rawdata->data,
|
|
rawdata->size);
|
|
}
|
|
|
|
static int rawdata_release(struct inode *inode, struct file *file)
|
|
{
|
|
aa_put_loaddata(file->private_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rawdata_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (!policy_view_capable(NULL))
|
|
return -EACCES;
|
|
file->private_data = __aa_get_loaddata(inode->i_private);
|
|
if (!file->private_data)
|
|
/* lost race: this entry is being reaped */
|
|
return -ENOENT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations rawdata_fops = {
|
|
.open = rawdata_open,
|
|
.read = rawdata_read,
|
|
.llseek = generic_file_llseek,
|
|
.release = rawdata_release,
|
|
};
|
|
|
|
static void remove_rawdata_dents(struct aa_loaddata *rawdata)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
|
|
if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
|
|
/* no refcounts on i_private */
|
|
aafs_remove(rawdata->dents[i]);
|
|
rawdata->dents[i] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
|
|
{
|
|
AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
|
|
|
|
if (rawdata->ns) {
|
|
remove_rawdata_dents(rawdata);
|
|
list_del_init(&rawdata->list);
|
|
aa_put_ns(rawdata->ns);
|
|
rawdata->ns = NULL;
|
|
}
|
|
}
|
|
|
|
int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
|
|
{
|
|
struct dentry *dent, *dir;
|
|
|
|
AA_BUG(!ns);
|
|
AA_BUG(!rawdata);
|
|
AA_BUG(!mutex_is_locked(&ns->lock));
|
|
AA_BUG(!ns_subdata_dir(ns));
|
|
|
|
/*
|
|
* just use ns revision dir was originally created at. This is
|
|
* under ns->lock and if load is successful revision will be
|
|
* bumped and is guaranteed to be unique
|
|
*/
|
|
rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
|
|
if (!rawdata->name)
|
|
return -ENOMEM;
|
|
|
|
dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
|
|
if (IS_ERR(dir))
|
|
/* ->name freed when rawdata freed */
|
|
return PTR_ERR(dir);
|
|
rawdata->dents[AAFS_LOADDATA_DIR] = dir;
|
|
|
|
dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
|
|
&seq_rawdata_abi_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
rawdata->dents[AAFS_LOADDATA_ABI] = dent;
|
|
|
|
dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
|
|
&seq_rawdata_revision_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
|
|
|
|
if (aa_g_hash_policy) {
|
|
dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
|
|
rawdata, &seq_rawdata_hash_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
rawdata->dents[AAFS_LOADDATA_HASH] = dent;
|
|
}
|
|
|
|
dent = aafs_create_file("raw_data", S_IFREG | 0444,
|
|
dir, rawdata, &rawdata_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
rawdata->dents[AAFS_LOADDATA_DATA] = dent;
|
|
d_inode(dent)->i_size = rawdata->size;
|
|
|
|
rawdata->ns = aa_get_ns(ns);
|
|
list_add(&rawdata->list, &ns->rawdata_list);
|
|
/* no refcount on inode rawdata */
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
remove_rawdata_dents(rawdata);
|
|
|
|
return PTR_ERR(dent);
|
|
}
|
|
|
|
/** fns to setup dynamic per profile/namespace files **/
|
|
|
|
/**
|
|
*
|
|
* Requires: @profile->ns->lock held
|
|
*/
|
|
void __aafs_profile_rmdir(struct aa_profile *profile)
|
|
{
|
|
struct aa_profile *child;
|
|
int i;
|
|
|
|
if (!profile)
|
|
return;
|
|
|
|
list_for_each_entry(child, &profile->base.profiles, base.list)
|
|
__aafs_profile_rmdir(child);
|
|
|
|
for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
|
|
struct aa_proxy *proxy;
|
|
if (!profile->dents[i])
|
|
continue;
|
|
|
|
proxy = d_inode(profile->dents[i])->i_private;
|
|
aafs_remove(profile->dents[i]);
|
|
aa_put_proxy(proxy);
|
|
profile->dents[i] = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
*
|
|
* Requires: @old->ns->lock held
|
|
*/
|
|
void __aafs_profile_migrate_dents(struct aa_profile *old,
|
|
struct aa_profile *new)
|
|
{
|
|
int i;
|
|
|
|
AA_BUG(!old);
|
|
AA_BUG(!new);
|
|
AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
|
|
|
|
for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
|
|
new->dents[i] = old->dents[i];
|
|
if (new->dents[i])
|
|
new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
|
|
old->dents[i] = NULL;
|
|
}
|
|
}
|
|
|
|
static struct dentry *create_profile_file(struct dentry *dir, const char *name,
|
|
struct aa_profile *profile,
|
|
const struct file_operations *fops)
|
|
{
|
|
struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
|
|
struct dentry *dent;
|
|
|
|
dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
|
|
if (IS_ERR(dent))
|
|
aa_put_proxy(proxy);
|
|
|
|
return dent;
|
|
}
|
|
|
|
static int profile_depth(struct aa_profile *profile)
|
|
{
|
|
int depth = 0;
|
|
|
|
rcu_read_lock();
|
|
for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
|
|
depth++;
|
|
rcu_read_unlock();
|
|
|
|
return depth;
|
|
}
|
|
|
|
static int gen_symlink_name(char *buffer, size_t bsize, int depth,
|
|
const char *dirname, const char *fname)
|
|
{
|
|
int error;
|
|
|
|
for (; depth > 0; depth--) {
|
|
if (bsize < 7)
|
|
return -ENAMETOOLONG;
|
|
strcpy(buffer, "../../");
|
|
buffer += 6;
|
|
bsize -= 6;
|
|
}
|
|
|
|
error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname);
|
|
if (error >= bsize || error < 0)
|
|
return -ENAMETOOLONG;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Requires: @profile->ns->lock held
|
|
*/
|
|
int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
|
|
{
|
|
struct aa_profile *child;
|
|
struct dentry *dent = NULL, *dir;
|
|
int error;
|
|
|
|
AA_BUG(!profile);
|
|
AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
|
|
|
|
if (!parent) {
|
|
struct aa_profile *p;
|
|
p = aa_deref_parent(profile);
|
|
dent = prof_dir(p);
|
|
/* adding to parent that previously didn't have children */
|
|
dent = aafs_create_dir("profiles", dent);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
prof_child_dir(p) = parent = dent;
|
|
}
|
|
|
|
if (!profile->dirname) {
|
|
int len, id_len;
|
|
len = mangle_name(profile->base.name, NULL);
|
|
id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
|
|
|
|
profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
|
|
if (!profile->dirname) {
|
|
error = -ENOMEM;
|
|
goto fail2;
|
|
}
|
|
|
|
mangle_name(profile->base.name, profile->dirname);
|
|
sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
|
|
}
|
|
|
|
dent = aafs_create_dir(profile->dirname, parent);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
prof_dir(profile) = dir = dent;
|
|
|
|
dent = create_profile_file(dir, "name", profile,
|
|
&seq_profile_name_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
profile->dents[AAFS_PROF_NAME] = dent;
|
|
|
|
dent = create_profile_file(dir, "mode", profile,
|
|
&seq_profile_mode_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
profile->dents[AAFS_PROF_MODE] = dent;
|
|
|
|
dent = create_profile_file(dir, "attach", profile,
|
|
&seq_profile_attach_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
profile->dents[AAFS_PROF_ATTACH] = dent;
|
|
|
|
if (profile->hash) {
|
|
dent = create_profile_file(dir, "sha1", profile,
|
|
&seq_profile_hash_fops);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
profile->dents[AAFS_PROF_HASH] = dent;
|
|
}
|
|
|
|
if (profile->rawdata) {
|
|
char target[64];
|
|
int depth = profile_depth(profile);
|
|
|
|
error = gen_symlink_name(target, sizeof(target), depth,
|
|
profile->rawdata->name, "sha1");
|
|
if (error < 0)
|
|
goto fail2;
|
|
dent = aafs_create_symlink("raw_sha1", dir, target, NULL);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
profile->dents[AAFS_PROF_RAW_HASH] = dent;
|
|
|
|
error = gen_symlink_name(target, sizeof(target), depth,
|
|
profile->rawdata->name, "abi");
|
|
if (error < 0)
|
|
goto fail2;
|
|
dent = aafs_create_symlink("raw_abi", dir, target, NULL);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
profile->dents[AAFS_PROF_RAW_ABI] = dent;
|
|
|
|
error = gen_symlink_name(target, sizeof(target), depth,
|
|
profile->rawdata->name, "raw_data");
|
|
if (error < 0)
|
|
goto fail2;
|
|
dent = aafs_create_symlink("raw_data", dir, target, NULL);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
profile->dents[AAFS_PROF_RAW_DATA] = dent;
|
|
}
|
|
|
|
list_for_each_entry(child, &profile->base.profiles, base.list) {
|
|
error = __aafs_profile_mkdir(child, prof_child_dir(profile));
|
|
if (error)
|
|
goto fail2;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
error = PTR_ERR(dent);
|
|
|
|
fail2:
|
|
__aafs_profile_rmdir(profile);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct aa_ns *ns, *parent;
|
|
/* TODO: improve permission check */
|
|
struct aa_label *label;
|
|
int error;
|
|
|
|
label = begin_current_label_crit_section();
|
|
error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
|
|
end_current_label_crit_section(label);
|
|
if (error)
|
|
return error;
|
|
|
|
parent = aa_get_ns(dir->i_private);
|
|
AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
|
|
|
|
/* we have to unlock and then relock to get locking order right
|
|
* for pin_fs
|
|
*/
|
|
inode_unlock(dir);
|
|
error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
|
|
mutex_lock(&parent->lock);
|
|
inode_lock_nested(dir, I_MUTEX_PARENT);
|
|
if (error)
|
|
goto out;
|
|
|
|
error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
|
|
NULL, NULL, NULL);
|
|
if (error)
|
|
goto out_pin;
|
|
|
|
ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
|
|
dentry);
|
|
if (IS_ERR(ns)) {
|
|
error = PTR_ERR(ns);
|
|
ns = NULL;
|
|
}
|
|
|
|
aa_put_ns(ns); /* list ref remains */
|
|
out_pin:
|
|
if (error)
|
|
simple_release_fs(&aafs_mnt, &aafs_count);
|
|
out:
|
|
mutex_unlock(&parent->lock);
|
|
aa_put_ns(parent);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct aa_ns *ns, *parent;
|
|
/* TODO: improve permission check */
|
|
struct aa_label *label;
|
|
int error;
|
|
|
|
label = begin_current_label_crit_section();
|
|
error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
|
|
end_current_label_crit_section(label);
|
|
if (error)
|
|
return error;
|
|
|
|
parent = aa_get_ns(dir->i_private);
|
|
/* rmdir calls the generic securityfs functions to remove files
|
|
* from the apparmor dir. It is up to the apparmor ns locking
|
|
* to avoid races.
|
|
*/
|
|
inode_unlock(dir);
|
|
inode_unlock(dentry->d_inode);
|
|
|
|
mutex_lock(&parent->lock);
|
|
ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
|
|
dentry->d_name.len));
|
|
if (!ns) {
|
|
error = -ENOENT;
|
|
goto out;
|
|
}
|
|
AA_BUG(ns_dir(ns) != dentry);
|
|
|
|
__aa_remove_ns(ns);
|
|
aa_put_ns(ns);
|
|
|
|
out:
|
|
mutex_unlock(&parent->lock);
|
|
inode_lock_nested(dir, I_MUTEX_PARENT);
|
|
inode_lock(dentry->d_inode);
|
|
aa_put_ns(parent);
|
|
|
|
return error;
|
|
}
|
|
|
|
static const struct inode_operations ns_dir_inode_operations = {
|
|
.lookup = simple_lookup,
|
|
.mkdir = ns_mkdir_op,
|
|
.rmdir = ns_rmdir_op,
|
|
};
|
|
|
|
static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
|
|
{
|
|
struct aa_loaddata *ent, *tmp;
|
|
|
|
AA_BUG(!mutex_is_locked(&ns->lock));
|
|
|
|
list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
|
|
__aa_fs_remove_rawdata(ent);
|
|
}
|
|
|
|
/**
|
|
*
|
|
* Requires: @ns->lock held
|
|
*/
|
|
void __aafs_ns_rmdir(struct aa_ns *ns)
|
|
{
|
|
struct aa_ns *sub;
|
|
struct aa_profile *child;
|
|
int i;
|
|
|
|
if (!ns)
|
|
return;
|
|
AA_BUG(!mutex_is_locked(&ns->lock));
|
|
|
|
list_for_each_entry(child, &ns->base.profiles, base.list)
|
|
__aafs_profile_rmdir(child);
|
|
|
|
list_for_each_entry(sub, &ns->sub_ns, base.list) {
|
|
mutex_lock(&sub->lock);
|
|
__aafs_ns_rmdir(sub);
|
|
mutex_unlock(&sub->lock);
|
|
}
|
|
|
|
__aa_fs_list_remove_rawdata(ns);
|
|
|
|
if (ns_subns_dir(ns)) {
|
|
sub = d_inode(ns_subns_dir(ns))->i_private;
|
|
aa_put_ns(sub);
|
|
}
|
|
if (ns_subload(ns)) {
|
|
sub = d_inode(ns_subload(ns))->i_private;
|
|
aa_put_ns(sub);
|
|
}
|
|
if (ns_subreplace(ns)) {
|
|
sub = d_inode(ns_subreplace(ns))->i_private;
|
|
aa_put_ns(sub);
|
|
}
|
|
if (ns_subremove(ns)) {
|
|
sub = d_inode(ns_subremove(ns))->i_private;
|
|
aa_put_ns(sub);
|
|
}
|
|
if (ns_subrevision(ns)) {
|
|
sub = d_inode(ns_subrevision(ns))->i_private;
|
|
aa_put_ns(sub);
|
|
}
|
|
|
|
for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
|
|
aafs_remove(ns->dents[i]);
|
|
ns->dents[i] = NULL;
|
|
}
|
|
}
|
|
|
|
/* assumes cleanup in caller */
|
|
static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
|
|
{
|
|
struct dentry *dent;
|
|
|
|
AA_BUG(!ns);
|
|
AA_BUG(!dir);
|
|
|
|
dent = aafs_create_dir("profiles", dir);
|
|
if (IS_ERR(dent))
|
|
return PTR_ERR(dent);
|
|
ns_subprofs_dir(ns) = dent;
|
|
|
|
dent = aafs_create_dir("raw_data", dir);
|
|
if (IS_ERR(dent))
|
|
return PTR_ERR(dent);
|
|
ns_subdata_dir(ns) = dent;
|
|
|
|
dent = aafs_create_file("revision", 0444, dir, ns,
|
|
&aa_fs_ns_revision_fops);
|
|
if (IS_ERR(dent))
|
|
return PTR_ERR(dent);
|
|
aa_get_ns(ns);
|
|
ns_subrevision(ns) = dent;
|
|
|
|
dent = aafs_create_file(".load", 0640, dir, ns,
|
|
&aa_fs_profile_load);
|
|
if (IS_ERR(dent))
|
|
return PTR_ERR(dent);
|
|
aa_get_ns(ns);
|
|
ns_subload(ns) = dent;
|
|
|
|
dent = aafs_create_file(".replace", 0640, dir, ns,
|
|
&aa_fs_profile_replace);
|
|
if (IS_ERR(dent))
|
|
return PTR_ERR(dent);
|
|
aa_get_ns(ns);
|
|
ns_subreplace(ns) = dent;
|
|
|
|
dent = aafs_create_file(".remove", 0640, dir, ns,
|
|
&aa_fs_profile_remove);
|
|
if (IS_ERR(dent))
|
|
return PTR_ERR(dent);
|
|
aa_get_ns(ns);
|
|
ns_subremove(ns) = dent;
|
|
|
|
/* use create_dentry so we can supply private data */
|
|
dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
|
|
&ns_dir_inode_operations);
|
|
if (IS_ERR(dent))
|
|
return PTR_ERR(dent);
|
|
aa_get_ns(ns);
|
|
ns_subns_dir(ns) = dent;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Requires: @ns->lock held
|
|
*/
|
|
int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
|
|
struct dentry *dent)
|
|
{
|
|
struct aa_ns *sub;
|
|
struct aa_profile *child;
|
|
struct dentry *dir;
|
|
int error;
|
|
|
|
AA_BUG(!ns);
|
|
AA_BUG(!parent);
|
|
AA_BUG(!mutex_is_locked(&ns->lock));
|
|
|
|
if (!name)
|
|
name = ns->base.name;
|
|
|
|
if (!dent) {
|
|
/* create ns dir if it doesn't already exist */
|
|
dent = aafs_create_dir(name, parent);
|
|
if (IS_ERR(dent))
|
|
goto fail;
|
|
} else
|
|
dget(dent);
|
|
ns_dir(ns) = dir = dent;
|
|
error = __aafs_ns_mkdir_entries(ns, dir);
|
|
if (error)
|
|
goto fail2;
|
|
|
|
/* profiles */
|
|
list_for_each_entry(child, &ns->base.profiles, base.list) {
|
|
error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
|
|
if (error)
|
|
goto fail2;
|
|
}
|
|
|
|
/* subnamespaces */
|
|
list_for_each_entry(sub, &ns->sub_ns, base.list) {
|
|
mutex_lock(&sub->lock);
|
|
error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
|
|
mutex_unlock(&sub->lock);
|
|
if (error)
|
|
goto fail2;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
error = PTR_ERR(dent);
|
|
|
|
fail2:
|
|
__aafs_ns_rmdir(ns);
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
#define list_entry_is_head(pos, head, member) (&pos->member == (head))
|
|
|
|
/**
|
|
* __next_ns - 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_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
|
|
{
|
|
struct aa_ns *parent, *next;
|
|
|
|
AA_BUG(!root);
|
|
AA_BUG(!ns);
|
|
AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
|
|
|
|
/* 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_next_entry(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_ns *root,
|
|
struct aa_ns *ns)
|
|
{
|
|
AA_BUG(!root);
|
|
AA_BUG(ns && !mutex_is_locked(&ns->lock));
|
|
|
|
for (; ns; ns = __next_ns(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_ns *ns = p->ns;
|
|
|
|
AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
|
|
|
|
/* 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_next_entry(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_next_entry(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_ns *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_ns(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_ns *root = aa_get_current_ns();
|
|
loff_t l = *pos;
|
|
f->private = 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_ns *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_ns *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_ns(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_ns *root = f->private;
|
|
|
|
aa_label_seq_xprint(f, root, &profile->label,
|
|
FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
|
|
seq_putc(f, '\n');
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations aa_sfs_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)
|
|
{
|
|
if (!policy_view_capable(NULL))
|
|
return -EACCES;
|
|
|
|
return seq_open(file, &aa_sfs_profiles_op);
|
|
}
|
|
|
|
static int profiles_release(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_release(inode, file);
|
|
}
|
|
|
|
static const struct file_operations aa_sfs_profiles_fops = {
|
|
.open = profiles_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = profiles_release,
|
|
};
|
|
|
|
|
|
/** Base file system setup **/
|
|
static struct aa_sfs_entry aa_sfs_entry_file[] = {
|
|
AA_SFS_FILE_STRING("mask",
|
|
"create read write exec append mmap_exec link lock"),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
|
|
AA_SFS_FILE_STRING("mask", "read trace"),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_signal[] = {
|
|
AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_domain[] = {
|
|
AA_SFS_FILE_BOOLEAN("change_hat", 1),
|
|
AA_SFS_FILE_BOOLEAN("change_hatv", 1),
|
|
AA_SFS_FILE_BOOLEAN("change_onexec", 1),
|
|
AA_SFS_FILE_BOOLEAN("change_profile", 1),
|
|
AA_SFS_FILE_BOOLEAN("stack", 1),
|
|
AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
|
|
AA_SFS_FILE_STRING("version", "1.2"),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_versions[] = {
|
|
AA_SFS_FILE_BOOLEAN("v5", 1),
|
|
AA_SFS_FILE_BOOLEAN("v6", 1),
|
|
AA_SFS_FILE_BOOLEAN("v7", 1),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_policy[] = {
|
|
AA_SFS_DIR("versions", aa_sfs_entry_versions),
|
|
AA_SFS_FILE_BOOLEAN("set_load", 1),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_mount[] = {
|
|
AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_ns[] = {
|
|
AA_SFS_FILE_BOOLEAN("profile", 1),
|
|
AA_SFS_FILE_BOOLEAN("pivot_root", 0),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
|
|
AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
|
|
AA_SFS_FILE_BOOLEAN("data", 1),
|
|
AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_query[] = {
|
|
AA_SFS_DIR("label", aa_sfs_entry_query_label),
|
|
{ }
|
|
};
|
|
static struct aa_sfs_entry aa_sfs_entry_features[] = {
|
|
AA_SFS_DIR("policy", aa_sfs_entry_policy),
|
|
AA_SFS_DIR("domain", aa_sfs_entry_domain),
|
|
AA_SFS_DIR("file", aa_sfs_entry_file),
|
|
AA_SFS_DIR("mount", aa_sfs_entry_mount),
|
|
AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
|
|
AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
|
|
AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
|
|
AA_SFS_DIR("caps", aa_sfs_entry_caps),
|
|
AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
|
|
AA_SFS_DIR("signal", aa_sfs_entry_signal),
|
|
AA_SFS_DIR("query", aa_sfs_entry_query),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
|
|
AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
|
|
AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
|
|
AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
|
|
AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
|
|
AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
|
|
AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
|
|
AA_SFS_DIR("features", aa_sfs_entry_features),
|
|
{ }
|
|
};
|
|
|
|
static struct aa_sfs_entry aa_sfs_entry =
|
|
AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
|
|
|
|
/**
|
|
* entry_create_file - create a file entry in the apparmor securityfs
|
|
* @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
|
|
* @parent: the parent dentry in the securityfs
|
|
*
|
|
* Use entry_remove_file to remove entries created with this fn.
|
|
*/
|
|
static int __init entry_create_file(struct aa_sfs_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 entry_remove_dir(struct aa_sfs_entry *fs_dir);
|
|
/**
|
|
* entry_create_dir - recursively create a directory entry in the securityfs
|
|
* @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
|
|
* @parent: the parent dentry in the securityfs
|
|
*
|
|
* Use entry_remove_dir to remove entries created with this fn.
|
|
*/
|
|
static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
|
|
struct dentry *parent)
|
|
{
|
|
struct aa_sfs_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_SFS_TYPE_DIR)
|
|
error = entry_create_dir(fs_file, fs_dir->dentry);
|
|
else
|
|
error = entry_create_file(fs_file, fs_dir->dentry);
|
|
if (error)
|
|
goto failed;
|
|
}
|
|
|
|
return 0;
|
|
|
|
failed:
|
|
entry_remove_dir(fs_dir);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* entry_remove_file - drop a single file entry in the apparmor securityfs
|
|
* @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
|
|
*/
|
|
static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
|
|
{
|
|
if (!fs_file->dentry)
|
|
return;
|
|
|
|
securityfs_remove(fs_file->dentry);
|
|
fs_file->dentry = NULL;
|
|
}
|
|
|
|
/**
|
|
* entry_remove_dir - recursively drop a directory entry from the securityfs
|
|
* @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
|
|
*/
|
|
static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
|
|
{
|
|
struct aa_sfs_entry *fs_file;
|
|
|
|
for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
|
|
if (fs_file->v_type == AA_SFS_TYPE_DIR)
|
|
entry_remove_dir(fs_file);
|
|
else
|
|
entry_remove_file(fs_file);
|
|
}
|
|
|
|
entry_remove_file(fs_dir);
|
|
}
|
|
|
|
/**
|
|
* aa_destroy_aafs - cleanup and free aafs
|
|
*
|
|
* releases dentries allocated by aa_create_aafs
|
|
*/
|
|
void __init aa_destroy_aafs(void)
|
|
{
|
|
entry_remove_dir(&aa_sfs_entry);
|
|
}
|
|
|
|
|
|
#define NULL_FILE_NAME ".null"
|
|
struct path aa_null;
|
|
|
|
static int aa_mk_null_file(struct dentry *parent)
|
|
{
|
|
struct vfsmount *mount = NULL;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
int count = 0;
|
|
int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
inode_lock(d_inode(parent));
|
|
dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
|
|
if (IS_ERR(dentry)) {
|
|
error = PTR_ERR(dentry);
|
|
goto out;
|
|
}
|
|
inode = new_inode(parent->d_inode->i_sb);
|
|
if (!inode) {
|
|
error = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
inode->i_ino = get_next_ino();
|
|
inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
|
|
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
|
|
init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
|
|
MKDEV(MEM_MAJOR, 3));
|
|
d_instantiate(dentry, inode);
|
|
aa_null.dentry = dget(dentry);
|
|
aa_null.mnt = mntget(mount);
|
|
|
|
error = 0;
|
|
|
|
out1:
|
|
dput(dentry);
|
|
out:
|
|
inode_unlock(d_inode(parent));
|
|
simple_release_fs(&mount, &count);
|
|
return error;
|
|
}
|
|
|
|
|
|
|
|
static const char *policy_get_link(struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
struct aa_ns *ns;
|
|
struct path path;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-ECHILD);
|
|
ns = aa_get_current_ns();
|
|
path.mnt = mntget(aafs_mnt);
|
|
path.dentry = dget(ns_dir(ns));
|
|
nd_jump_link(&path);
|
|
aa_put_ns(ns);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int ns_get_name(char *buf, size_t size, struct aa_ns *ns,
|
|
struct inode *inode)
|
|
{
|
|
int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino);
|
|
|
|
if (res < 0 || res >= size)
|
|
res = -ENOENT;
|
|
|
|
return res;
|
|
}
|
|
|
|
static int policy_readlink(struct dentry *dentry, char __user *buffer,
|
|
int buflen)
|
|
{
|
|
struct aa_ns *ns;
|
|
char name[32];
|
|
int res;
|
|
|
|
ns = aa_get_current_ns();
|
|
res = ns_get_name(name, sizeof(name), ns, d_inode(dentry));
|
|
if (res >= 0)
|
|
res = readlink_copy(buffer, buflen, name);
|
|
aa_put_ns(ns);
|
|
|
|
return res;
|
|
}
|
|
|
|
static const struct inode_operations policy_link_iops = {
|
|
.readlink = policy_readlink,
|
|
.get_link = policy_get_link,
|
|
};
|
|
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
struct dentry *dent;
|
|
int error;
|
|
|
|
if (!apparmor_initialized)
|
|
return 0;
|
|
|
|
if (aa_sfs_entry.dentry) {
|
|
AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* setup apparmorfs used to virtualize policy/ */
|
|
aafs_mnt = kern_mount(&aafs_ops);
|
|
if (IS_ERR(aafs_mnt))
|
|
panic("can't set apparmorfs up\n");
|
|
aafs_mnt->mnt_sb->s_flags &= ~MS_NOUSER;
|
|
|
|
/* Populate fs tree. */
|
|
error = entry_create_dir(&aa_sfs_entry, NULL);
|
|
if (error)
|
|
goto error;
|
|
|
|
dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
|
|
NULL, &aa_fs_profile_load);
|
|
if (IS_ERR(dent)) {
|
|
error = PTR_ERR(dent);
|
|
goto error;
|
|
}
|
|
ns_subload(root_ns) = dent;
|
|
|
|
dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
|
|
NULL, &aa_fs_profile_replace);
|
|
if (IS_ERR(dent)) {
|
|
error = PTR_ERR(dent);
|
|
goto error;
|
|
}
|
|
ns_subreplace(root_ns) = dent;
|
|
|
|
dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
|
|
NULL, &aa_fs_profile_remove);
|
|
if (IS_ERR(dent)) {
|
|
error = PTR_ERR(dent);
|
|
goto error;
|
|
}
|
|
ns_subremove(root_ns) = dent;
|
|
|
|
dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
|
|
NULL, &aa_fs_ns_revision_fops);
|
|
if (IS_ERR(dent)) {
|
|
error = PTR_ERR(dent);
|
|
goto error;
|
|
}
|
|
ns_subrevision(root_ns) = dent;
|
|
|
|
/* policy tree referenced by magic policy symlink */
|
|
mutex_lock(&root_ns->lock);
|
|
error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
|
|
aafs_mnt->mnt_root);
|
|
mutex_unlock(&root_ns->lock);
|
|
if (error)
|
|
goto error;
|
|
|
|
/* magic symlink similar to nsfs redirects based on task policy */
|
|
dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
|
|
NULL, &policy_link_iops);
|
|
if (IS_ERR(dent)) {
|
|
error = PTR_ERR(dent);
|
|
goto error;
|
|
}
|
|
|
|
error = aa_mk_null_file(aa_sfs_entry.dentry);
|
|
if (error)
|
|
goto error;
|
|
|
|
/* TODO: add default profile to apparmorfs */
|
|
|
|
/* 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);
|