mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Ingo Molnar](/assets/img/avatar_default.png)
Add #include <linux/cred.h> dependencies to all .c files rely on sched.h doing that for them. Note that even if the count where we need to add extra headers seems high, it's still a net win, because <linux/sched.h> is included in over 2,200 files ... Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
169 lines
4.5 KiB
C
169 lines
4.5 KiB
C
/* General persistent per-UID keyrings register
|
|
*
|
|
* Copyright (C) 2013 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/user_namespace.h>
|
|
#include <linux/cred.h>
|
|
|
|
#include "internal.h"
|
|
|
|
unsigned persistent_keyring_expiry = 3 * 24 * 3600; /* Expire after 3 days of non-use */
|
|
|
|
/*
|
|
* Create the persistent keyring register for the current user namespace.
|
|
*
|
|
* Called with the namespace's sem locked for writing.
|
|
*/
|
|
static int key_create_persistent_register(struct user_namespace *ns)
|
|
{
|
|
struct key *reg = keyring_alloc(".persistent_register",
|
|
KUIDT_INIT(0), KGIDT_INIT(0),
|
|
current_cred(),
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ),
|
|
KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
|
|
if (IS_ERR(reg))
|
|
return PTR_ERR(reg);
|
|
|
|
ns->persistent_keyring_register = reg;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create the persistent keyring for the specified user.
|
|
*
|
|
* Called with the namespace's sem locked for writing.
|
|
*/
|
|
static key_ref_t key_create_persistent(struct user_namespace *ns, kuid_t uid,
|
|
struct keyring_index_key *index_key)
|
|
{
|
|
struct key *persistent;
|
|
key_ref_t reg_ref, persistent_ref;
|
|
|
|
if (!ns->persistent_keyring_register) {
|
|
long err = key_create_persistent_register(ns);
|
|
if (err < 0)
|
|
return ERR_PTR(err);
|
|
} else {
|
|
reg_ref = make_key_ref(ns->persistent_keyring_register, true);
|
|
persistent_ref = find_key_to_update(reg_ref, index_key);
|
|
if (persistent_ref)
|
|
return persistent_ref;
|
|
}
|
|
|
|
persistent = keyring_alloc(index_key->description,
|
|
uid, INVALID_GID, current_cred(),
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ),
|
|
KEY_ALLOC_NOT_IN_QUOTA, NULL,
|
|
ns->persistent_keyring_register);
|
|
if (IS_ERR(persistent))
|
|
return ERR_CAST(persistent);
|
|
|
|
return make_key_ref(persistent, true);
|
|
}
|
|
|
|
/*
|
|
* Get the persistent keyring for a specific UID and link it to the nominated
|
|
* keyring.
|
|
*/
|
|
static long key_get_persistent(struct user_namespace *ns, kuid_t uid,
|
|
key_ref_t dest_ref)
|
|
{
|
|
struct keyring_index_key index_key;
|
|
struct key *persistent;
|
|
key_ref_t reg_ref, persistent_ref;
|
|
char buf[32];
|
|
long ret;
|
|
|
|
/* Look in the register if it exists */
|
|
index_key.type = &key_type_keyring;
|
|
index_key.description = buf;
|
|
index_key.desc_len = sprintf(buf, "_persistent.%u", from_kuid(ns, uid));
|
|
|
|
if (ns->persistent_keyring_register) {
|
|
reg_ref = make_key_ref(ns->persistent_keyring_register, true);
|
|
down_read(&ns->persistent_keyring_register_sem);
|
|
persistent_ref = find_key_to_update(reg_ref, &index_key);
|
|
up_read(&ns->persistent_keyring_register_sem);
|
|
|
|
if (persistent_ref)
|
|
goto found;
|
|
}
|
|
|
|
/* It wasn't in the register, so we'll need to create it. We might
|
|
* also need to create the register.
|
|
*/
|
|
down_write(&ns->persistent_keyring_register_sem);
|
|
persistent_ref = key_create_persistent(ns, uid, &index_key);
|
|
up_write(&ns->persistent_keyring_register_sem);
|
|
if (!IS_ERR(persistent_ref))
|
|
goto found;
|
|
|
|
return PTR_ERR(persistent_ref);
|
|
|
|
found:
|
|
ret = key_task_permission(persistent_ref, current_cred(), KEY_NEED_LINK);
|
|
if (ret == 0) {
|
|
persistent = key_ref_to_ptr(persistent_ref);
|
|
ret = key_link(key_ref_to_ptr(dest_ref), persistent);
|
|
if (ret == 0) {
|
|
key_set_timeout(persistent, persistent_keyring_expiry);
|
|
ret = persistent->serial;
|
|
}
|
|
}
|
|
|
|
key_ref_put(persistent_ref);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Get the persistent keyring for a specific UID and link it to the nominated
|
|
* keyring.
|
|
*/
|
|
long keyctl_get_persistent(uid_t _uid, key_serial_t destid)
|
|
{
|
|
struct user_namespace *ns = current_user_ns();
|
|
key_ref_t dest_ref;
|
|
kuid_t uid;
|
|
long ret;
|
|
|
|
/* -1 indicates the current user */
|
|
if (_uid == (uid_t)-1) {
|
|
uid = current_uid();
|
|
} else {
|
|
uid = make_kuid(ns, _uid);
|
|
if (!uid_valid(uid))
|
|
return -EINVAL;
|
|
|
|
/* You can only see your own persistent cache if you're not
|
|
* sufficiently privileged.
|
|
*/
|
|
if (!uid_eq(uid, current_uid()) &&
|
|
!uid_eq(uid, current_euid()) &&
|
|
!ns_capable(ns, CAP_SETUID))
|
|
return -EPERM;
|
|
}
|
|
|
|
/* There must be a destination keyring */
|
|
dest_ref = lookup_user_key(destid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
|
|
if (IS_ERR(dest_ref))
|
|
return PTR_ERR(dest_ref);
|
|
if (key_ref_to_ptr(dest_ref)->type != &key_type_keyring) {
|
|
ret = -ENOTDIR;
|
|
goto out_put_dest;
|
|
}
|
|
|
|
ret = key_get_persistent(ns, uid, dest_ref);
|
|
|
|
out_put_dest:
|
|
key_ref_put(dest_ref);
|
|
return ret;
|
|
}
|