![Linus Torvalds](/assets/img/avatar_default.png)
Pull security subsystem updates from James Morris: "Nothing groundbreaking for this kernel, just cleanups and fixes, and a couple of Smack enhancements." * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (21 commits) Smack: Maintainer Record Smack: don't show empty rules when /smack/load or /smack/load2 is read Smack: user access check bounds Smack: onlycap limits on CAP_MAC_ADMIN Smack: fix smack_new_inode bogosities ima: audit is compiled only when enabled ima: ima_initialized is set only if successful ima: add policy for pseudo fs ima: remove unused cleanup functions ima: free securityfs violations file ima: use full pathnames in measurement list security: Fix nommu build. samples: seccomp: add .gitignore for untracked executables tpm: check the chip reference before using it TPM: fix memleak when register hardware fails TPM: chip disabled state erronously being reported as error MAINTAINERS: TPM maintainers' contacts update Merge branches 'next-queue' and 'next' into next Remove unused code from MPI library Revert "crypto: GnuPG based MPI lib - additional sources (part 4)" ...
267 lines
8.7 KiB
C
267 lines
8.7 KiB
C
/* Authentication token and access key management internal defs
|
|
*
|
|
* Copyright (C) 2003-5, 2007 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 License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _INTERNAL_H
|
|
#define _INTERNAL_H
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/key-type.h>
|
|
#include <linux/task_work.h>
|
|
|
|
#ifdef __KDEBUG
|
|
#define kenter(FMT, ...) \
|
|
printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
|
|
#define kleave(FMT, ...) \
|
|
printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
|
|
#define kdebug(FMT, ...) \
|
|
printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
|
|
#else
|
|
#define kenter(FMT, ...) \
|
|
no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
|
|
#define kleave(FMT, ...) \
|
|
no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
|
|
#define kdebug(FMT, ...) \
|
|
no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
|
|
#endif
|
|
|
|
extern struct key_type key_type_dead;
|
|
extern struct key_type key_type_user;
|
|
extern struct key_type key_type_logon;
|
|
|
|
/*****************************************************************************/
|
|
/*
|
|
* Keep track of keys for a user.
|
|
*
|
|
* This needs to be separate to user_struct to avoid a refcount-loop
|
|
* (user_struct pins some keyrings which pin this struct).
|
|
*
|
|
* We also keep track of keys under request from userspace for this UID here.
|
|
*/
|
|
struct key_user {
|
|
struct rb_node node;
|
|
struct mutex cons_lock; /* construction initiation lock */
|
|
spinlock_t lock;
|
|
atomic_t usage; /* for accessing qnkeys & qnbytes */
|
|
atomic_t nkeys; /* number of keys */
|
|
atomic_t nikeys; /* number of instantiated keys */
|
|
uid_t uid;
|
|
struct user_namespace *user_ns;
|
|
int qnkeys; /* number of keys allocated to this user */
|
|
int qnbytes; /* number of bytes allocated to this user */
|
|
};
|
|
|
|
extern struct rb_root key_user_tree;
|
|
extern spinlock_t key_user_lock;
|
|
extern struct key_user root_key_user;
|
|
|
|
extern struct key_user *key_user_lookup(uid_t uid,
|
|
struct user_namespace *user_ns);
|
|
extern void key_user_put(struct key_user *user);
|
|
|
|
/*
|
|
* Key quota limits.
|
|
* - root has its own separate limits to everyone else
|
|
*/
|
|
extern unsigned key_quota_root_maxkeys;
|
|
extern unsigned key_quota_root_maxbytes;
|
|
extern unsigned key_quota_maxkeys;
|
|
extern unsigned key_quota_maxbytes;
|
|
|
|
#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
|
|
|
|
|
|
extern struct kmem_cache *key_jar;
|
|
extern struct rb_root key_serial_tree;
|
|
extern spinlock_t key_serial_lock;
|
|
extern struct mutex key_construction_mutex;
|
|
extern wait_queue_head_t request_key_conswq;
|
|
|
|
|
|
extern struct key_type *key_type_lookup(const char *type);
|
|
extern void key_type_put(struct key_type *ktype);
|
|
|
|
extern int __key_link_begin(struct key *keyring,
|
|
const struct key_type *type,
|
|
const char *description,
|
|
unsigned long *_prealloc);
|
|
extern int __key_link_check_live_key(struct key *keyring, struct key *key);
|
|
extern void __key_link(struct key *keyring, struct key *key,
|
|
unsigned long *_prealloc);
|
|
extern void __key_link_end(struct key *keyring,
|
|
struct key_type *type,
|
|
unsigned long prealloc);
|
|
|
|
extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
|
|
const struct key_type *type,
|
|
const char *description,
|
|
key_perm_t perm);
|
|
|
|
extern struct key *keyring_search_instkey(struct key *keyring,
|
|
key_serial_t target_id);
|
|
|
|
typedef int (*key_match_func_t)(const struct key *, const void *);
|
|
|
|
extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
|
|
const struct cred *cred,
|
|
struct key_type *type,
|
|
const void *description,
|
|
key_match_func_t match,
|
|
bool no_state_check);
|
|
|
|
extern key_ref_t search_my_process_keyrings(struct key_type *type,
|
|
const void *description,
|
|
key_match_func_t match,
|
|
bool no_state_check,
|
|
const struct cred *cred);
|
|
extern key_ref_t search_process_keyrings(struct key_type *type,
|
|
const void *description,
|
|
key_match_func_t match,
|
|
const struct cred *cred);
|
|
|
|
extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
|
|
|
|
extern int install_user_keyrings(void);
|
|
extern int install_thread_keyring_to_cred(struct cred *);
|
|
extern int install_process_keyring_to_cred(struct cred *);
|
|
extern int install_session_keyring_to_cred(struct cred *, struct key *);
|
|
|
|
extern struct key *request_key_and_link(struct key_type *type,
|
|
const char *description,
|
|
const void *callout_info,
|
|
size_t callout_len,
|
|
void *aux,
|
|
struct key *dest_keyring,
|
|
unsigned long flags);
|
|
|
|
extern int lookup_user_key_possessed(const struct key *key, const void *target);
|
|
extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
|
|
key_perm_t perm);
|
|
#define KEY_LOOKUP_CREATE 0x01
|
|
#define KEY_LOOKUP_PARTIAL 0x02
|
|
#define KEY_LOOKUP_FOR_UNLINK 0x04
|
|
|
|
extern long join_session_keyring(const char *name);
|
|
extern void key_change_session_keyring(struct callback_head *twork);
|
|
|
|
extern struct work_struct key_gc_work;
|
|
extern unsigned key_gc_delay;
|
|
extern void keyring_gc(struct key *keyring, time_t limit);
|
|
extern void key_schedule_gc(time_t gc_at);
|
|
extern void key_schedule_gc_links(void);
|
|
extern void key_gc_keytype(struct key_type *ktype);
|
|
|
|
extern int key_task_permission(const key_ref_t key_ref,
|
|
const struct cred *cred,
|
|
key_perm_t perm);
|
|
|
|
/*
|
|
* Check to see whether permission is granted to use a key in the desired way.
|
|
*/
|
|
static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
|
|
{
|
|
return key_task_permission(key_ref, current_cred(), perm);
|
|
}
|
|
|
|
/* required permissions */
|
|
#define KEY_VIEW 0x01 /* require permission to view attributes */
|
|
#define KEY_READ 0x02 /* require permission to read content */
|
|
#define KEY_WRITE 0x04 /* require permission to update / modify */
|
|
#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
|
|
#define KEY_LINK 0x10 /* require permission to link */
|
|
#define KEY_SETATTR 0x20 /* require permission to change attributes */
|
|
#define KEY_ALL 0x3f /* all the above permissions */
|
|
|
|
/*
|
|
* Authorisation record for request_key().
|
|
*/
|
|
struct request_key_auth {
|
|
struct key *target_key;
|
|
struct key *dest_keyring;
|
|
const struct cred *cred;
|
|
void *callout_info;
|
|
size_t callout_len;
|
|
pid_t pid;
|
|
};
|
|
|
|
extern struct key_type key_type_request_key_auth;
|
|
extern struct key *request_key_auth_new(struct key *target,
|
|
const void *callout_info,
|
|
size_t callout_len,
|
|
struct key *dest_keyring);
|
|
|
|
extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
|
|
|
|
/*
|
|
* Determine whether a key is dead.
|
|
*/
|
|
static inline bool key_is_dead(struct key *key, time_t limit)
|
|
{
|
|
return
|
|
key->flags & ((1 << KEY_FLAG_DEAD) |
|
|
(1 << KEY_FLAG_INVALIDATED)) ||
|
|
(key->expiry > 0 && key->expiry <= limit);
|
|
}
|
|
|
|
/*
|
|
* keyctl() functions
|
|
*/
|
|
extern long keyctl_get_keyring_ID(key_serial_t, int);
|
|
extern long keyctl_join_session_keyring(const char __user *);
|
|
extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
|
|
extern long keyctl_revoke_key(key_serial_t);
|
|
extern long keyctl_keyring_clear(key_serial_t);
|
|
extern long keyctl_keyring_link(key_serial_t, key_serial_t);
|
|
extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
|
|
extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
|
|
extern long keyctl_keyring_search(key_serial_t, const char __user *,
|
|
const char __user *, key_serial_t);
|
|
extern long keyctl_read_key(key_serial_t, char __user *, size_t);
|
|
extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
|
|
extern long keyctl_setperm_key(key_serial_t, key_perm_t);
|
|
extern long keyctl_instantiate_key(key_serial_t, const void __user *,
|
|
size_t, key_serial_t);
|
|
extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
|
|
extern long keyctl_set_reqkey_keyring(int);
|
|
extern long keyctl_set_timeout(key_serial_t, unsigned);
|
|
extern long keyctl_assume_authority(key_serial_t);
|
|
extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
|
|
size_t buflen);
|
|
extern long keyctl_session_to_parent(void);
|
|
extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
|
|
extern long keyctl_instantiate_key_iov(key_serial_t,
|
|
const struct iovec __user *,
|
|
unsigned, key_serial_t);
|
|
extern long keyctl_invalidate_key(key_serial_t);
|
|
|
|
extern long keyctl_instantiate_key_common(key_serial_t,
|
|
const struct iovec *,
|
|
unsigned, size_t, key_serial_t);
|
|
|
|
/*
|
|
* Debugging key validation
|
|
*/
|
|
#ifdef KEY_DEBUGGING
|
|
extern void __key_check(const struct key *);
|
|
|
|
static inline void key_check(const struct key *key)
|
|
{
|
|
if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
|
|
__key_check(key);
|
|
}
|
|
|
|
#else
|
|
|
|
#define key_check(key) do {} while(0)
|
|
|
|
#endif
|
|
|
|
#endif /* _INTERNAL_H */
|