375 lines
12 KiB
C
375 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/* 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)
|
|
*/
|
|
|
|
#ifndef _INTERNAL_H
|
|
#define _INTERNAL_H
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/wait_bit.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/key-type.h>
|
|
#include <linux/task_work.h>
|
|
#include <linux/keyctl.h>
|
|
#include <linux/refcount.h>
|
|
#include <linux/watch_queue.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
struct iovec;
|
|
|
|
#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;
|
|
refcount_t usage; /* for accessing qnkeys & qnbytes */
|
|
atomic_t nkeys; /* number of keys */
|
|
atomic_t nikeys; /* number of instantiated keys */
|
|
kuid_t uid;
|
|
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(kuid_t uid);
|
|
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 void key_set_index_key(struct keyring_index_key *index_key);
|
|
extern struct key_type *key_type_lookup(const char *type);
|
|
extern void key_type_put(struct key_type *ktype);
|
|
|
|
extern int __key_link_lock(struct key *keyring,
|
|
const struct keyring_index_key *index_key);
|
|
extern int __key_move_lock(struct key *l_keyring, struct key *u_keyring,
|
|
const struct keyring_index_key *index_key);
|
|
extern int __key_link_begin(struct key *keyring,
|
|
const struct keyring_index_key *index_key,
|
|
struct assoc_array_edit **_edit);
|
|
extern int __key_link_check_live_key(struct key *keyring, struct key *key);
|
|
extern void __key_link(struct key *keyring, struct key *key,
|
|
struct assoc_array_edit **_edit);
|
|
extern void __key_link_end(struct key *keyring,
|
|
const struct keyring_index_key *index_key,
|
|
struct assoc_array_edit *edit);
|
|
|
|
extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
|
|
const struct keyring_index_key *index_key);
|
|
|
|
extern struct key *keyring_search_instkey(struct key *keyring,
|
|
key_serial_t target_id);
|
|
|
|
extern int iterate_over_keyring(const struct key *keyring,
|
|
int (*func)(const struct key *key, void *data),
|
|
void *data);
|
|
|
|
struct keyring_search_context {
|
|
struct keyring_index_key index_key;
|
|
const struct cred *cred;
|
|
struct key_match_data match_data;
|
|
unsigned flags;
|
|
#define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */
|
|
#define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */
|
|
#define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */
|
|
#define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */
|
|
#define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */
|
|
#define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */
|
|
#define KEYRING_SEARCH_RECURSE 0x0040 /* Search child keyrings also */
|
|
|
|
int (*iterator)(const void *object, void *iterator_data);
|
|
|
|
/* Internal stuff */
|
|
int skipped_ret;
|
|
bool possessed;
|
|
key_ref_t result;
|
|
time64_t now;
|
|
};
|
|
|
|
extern bool key_default_cmp(const struct key *key,
|
|
const struct key_match_data *match_data);
|
|
extern key_ref_t keyring_search_rcu(key_ref_t keyring_ref,
|
|
struct keyring_search_context *ctx);
|
|
|
|
extern key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx);
|
|
extern key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx);
|
|
|
|
extern struct key *find_keyring_by_name(const char *name, bool uid_keyring);
|
|
|
|
extern int look_up_user_keyrings(struct key **, struct key **);
|
|
extern struct key *get_user_session_keyring_rcu(const struct cred *);
|
|
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,
|
|
struct key_tag *domain_tag,
|
|
const void *callout_info,
|
|
size_t callout_len,
|
|
void *aux,
|
|
struct key *dest_keyring,
|
|
unsigned long flags);
|
|
|
|
extern bool lookup_user_key_possessed(const struct key *key,
|
|
const struct key_match_data *match_data);
|
|
|
|
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, time64_t limit);
|
|
extern void keyring_restriction_gc(struct key *keyring,
|
|
struct key_type *dead_type);
|
|
extern void key_schedule_gc(time64_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,
|
|
enum key_need_perm need_perm);
|
|
|
|
static inline void notify_key(struct key *key,
|
|
enum key_notification_subtype subtype, u32 aux)
|
|
{
|
|
#ifdef CONFIG_KEY_NOTIFICATIONS
|
|
struct key_notification n = {
|
|
.watch.type = WATCH_TYPE_KEY_NOTIFY,
|
|
.watch.subtype = subtype,
|
|
.watch.info = watch_sizeof(n),
|
|
.key_id = key_serial(key),
|
|
.aux = aux,
|
|
};
|
|
|
|
post_watch_notification(key->watchers, &n.watch, current_cred(),
|
|
n.key_id);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
enum key_need_perm need_perm)
|
|
{
|
|
return key_task_permission(key_ref, current_cred(), need_perm);
|
|
}
|
|
|
|
extern struct key_type key_type_request_key_auth;
|
|
extern struct key *request_key_auth_new(struct key *target,
|
|
const char *op,
|
|
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(const struct key *key, time64_t limit)
|
|
{
|
|
return
|
|
key->flags & ((1 << KEY_FLAG_DEAD) |
|
|
(1 << KEY_FLAG_INVALIDATED)) ||
|
|
(key->expiry > 0 && key->expiry <= limit) ||
|
|
key->domain_tag->removed;
|
|
}
|
|
|
|
/*
|
|
* 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_move(key_serial_t, key_serial_t, key_serial_t, unsigned int);
|
|
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_restrict_keyring(key_serial_t id,
|
|
const char __user *_type,
|
|
const char __user *_restriction);
|
|
#ifdef CONFIG_PERSISTENT_KEYRINGS
|
|
extern long keyctl_get_persistent(uid_t, key_serial_t);
|
|
extern unsigned persistent_keyring_expiry;
|
|
#else
|
|
static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_KEY_DH_OPERATIONS
|
|
extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
|
|
size_t, struct keyctl_kdf_params __user *);
|
|
extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
|
|
size_t, struct keyctl_kdf_params *);
|
|
#ifdef CONFIG_COMPAT
|
|
extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
|
|
char __user *buffer, size_t buflen,
|
|
struct compat_keyctl_kdf_params __user *kdf);
|
|
#endif
|
|
#define KEYCTL_KDF_MAX_OUTPUT_LEN 1024 /* max length of KDF output */
|
|
#define KEYCTL_KDF_MAX_OI_LEN 64 /* max length of otherinfo */
|
|
#else
|
|
static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
|
|
char __user *buffer, size_t buflen,
|
|
struct keyctl_kdf_params __user *kdf)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static inline long compat_keyctl_dh_compute(
|
|
struct keyctl_dh_params __user *params,
|
|
char __user *buffer, size_t buflen,
|
|
struct keyctl_kdf_params __user *kdf)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_ASYMMETRIC_KEY_TYPE
|
|
extern long keyctl_pkey_query(key_serial_t,
|
|
const char __user *,
|
|
struct keyctl_pkey_query __user *);
|
|
|
|
extern long keyctl_pkey_verify(const struct keyctl_pkey_params __user *,
|
|
const char __user *,
|
|
const void __user *, const void __user *);
|
|
|
|
extern long keyctl_pkey_e_d_s(int,
|
|
const struct keyctl_pkey_params __user *,
|
|
const char __user *,
|
|
const void __user *, void __user *);
|
|
#else
|
|
static inline long keyctl_pkey_query(key_serial_t id,
|
|
const char __user *_info,
|
|
struct keyctl_pkey_query __user *_res)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline long keyctl_pkey_verify(const struct keyctl_pkey_params __user *params,
|
|
const char __user *_info,
|
|
const void __user *_in,
|
|
const void __user *_in2)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline long keyctl_pkey_e_d_s(int op,
|
|
const struct keyctl_pkey_params __user *params,
|
|
const char __user *_info,
|
|
const void __user *_in,
|
|
void __user *_out)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif
|
|
|
|
extern long keyctl_capabilities(unsigned char __user *_buffer, size_t buflen);
|
|
|
|
#ifdef CONFIG_KEY_NOTIFICATIONS
|
|
extern long keyctl_watch_key(key_serial_t, int, int);
|
|
#else
|
|
static inline long keyctl_watch_key(key_serial_t key_id, int watch_fd, int watch_id)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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 */
|