377 lines
12 KiB
C
377 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Authentication token and access key management internal defs
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*
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* Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#ifndef _INTERNAL_H
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#define _INTERNAL_H
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#include <linux/sched.h>
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#include <linux/wait_bit.h>
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#include <linux/cred.h>
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#include <linux/key-type.h>
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#include <linux/task_work.h>
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#include <linux/keyctl.h>
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#include <linux/refcount.h>
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#include <linux/watch_queue.h>
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#include <linux/compat.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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struct iovec;
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#ifdef __KDEBUG
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#define kenter(FMT, ...) \
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printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
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#define kleave(FMT, ...) \
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printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
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#define kdebug(FMT, ...) \
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printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
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#else
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#define kenter(FMT, ...) \
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no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
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#define kleave(FMT, ...) \
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no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
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#define kdebug(FMT, ...) \
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no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
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#endif
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extern struct key_type key_type_dead;
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extern struct key_type key_type_user;
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extern struct key_type key_type_logon;
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/*****************************************************************************/
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/*
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* Keep track of keys for a user.
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*
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* This needs to be separate to user_struct to avoid a refcount-loop
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* (user_struct pins some keyrings which pin this struct).
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*
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* We also keep track of keys under request from userspace for this UID here.
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*/
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struct key_user {
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struct rb_node node;
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struct mutex cons_lock; /* construction initiation lock */
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spinlock_t lock;
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refcount_t usage; /* for accessing qnkeys & qnbytes */
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atomic_t nkeys; /* number of keys */
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atomic_t nikeys; /* number of instantiated keys */
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kuid_t uid;
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int qnkeys; /* number of keys allocated to this user */
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int qnbytes; /* number of bytes allocated to this user */
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};
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extern struct rb_root key_user_tree;
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extern spinlock_t key_user_lock;
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extern struct key_user root_key_user;
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extern struct key_user *key_user_lookup(kuid_t uid);
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extern void key_user_put(struct key_user *user);
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/*
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* Key quota limits.
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* - root has its own separate limits to everyone else
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*/
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extern unsigned key_quota_root_maxkeys;
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extern unsigned key_quota_root_maxbytes;
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extern unsigned key_quota_maxkeys;
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extern unsigned key_quota_maxbytes;
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#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
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extern struct kmem_cache *key_jar;
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extern struct rb_root key_serial_tree;
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extern spinlock_t key_serial_lock;
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extern struct mutex key_construction_mutex;
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extern wait_queue_head_t request_key_conswq;
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extern void key_set_index_key(struct keyring_index_key *index_key);
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extern struct key_type *key_type_lookup(const char *type);
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extern void key_type_put(struct key_type *ktype);
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extern int __key_link_lock(struct key *keyring,
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const struct keyring_index_key *index_key);
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extern int __key_move_lock(struct key *l_keyring, struct key *u_keyring,
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const struct keyring_index_key *index_key);
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extern int __key_link_begin(struct key *keyring,
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const struct keyring_index_key *index_key,
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struct assoc_array_edit **_edit);
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extern int __key_link_check_live_key(struct key *keyring, struct key *key);
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extern void __key_link(struct key *keyring, struct key *key,
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struct assoc_array_edit **_edit);
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extern void __key_link_end(struct key *keyring,
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const struct keyring_index_key *index_key,
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struct assoc_array_edit *edit);
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extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
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const struct keyring_index_key *index_key);
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struct keyring_search_context {
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struct keyring_index_key index_key;
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const struct cred *cred;
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struct key_match_data match_data;
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unsigned flags;
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#define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */
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#define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */
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#define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */
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#define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */
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#define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */
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#define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */
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#define KEYRING_SEARCH_RECURSE 0x0040 /* Search child keyrings also */
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int (*iterator)(const void *object, void *iterator_data);
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/* Internal stuff */
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int skipped_ret;
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bool possessed;
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key_ref_t result;
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time64_t now;
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};
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extern bool key_default_cmp(const struct key *key,
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const struct key_match_data *match_data);
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extern key_ref_t keyring_search_rcu(key_ref_t keyring_ref,
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struct keyring_search_context *ctx);
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extern key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx);
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extern key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx);
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extern struct key *find_keyring_by_name(const char *name, bool uid_keyring);
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extern int look_up_user_keyrings(struct key **, struct key **);
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extern struct key *get_user_session_keyring_rcu(const struct cred *);
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extern int install_thread_keyring_to_cred(struct cred *);
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extern int install_process_keyring_to_cred(struct cred *);
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extern int install_session_keyring_to_cred(struct cred *, struct key *);
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extern struct key *request_key_and_link(struct key_type *type,
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const char *description,
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struct key_tag *domain_tag,
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const void *callout_info,
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size_t callout_len,
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void *aux,
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struct key *dest_keyring,
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unsigned long flags);
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extern bool lookup_user_key_possessed(const struct key *key,
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const struct key_match_data *match_data);
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extern long join_session_keyring(const char *name);
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extern void key_change_session_keyring(struct callback_head *twork);
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extern struct work_struct key_gc_work;
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extern unsigned key_gc_delay;
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extern void keyring_gc(struct key *keyring, time64_t limit);
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extern void keyring_restriction_gc(struct key *keyring,
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struct key_type *dead_type);
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void key_set_expiry(struct key *key, time64_t expiry);
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extern void key_schedule_gc(time64_t gc_at);
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extern void key_schedule_gc_links(void);
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extern void key_gc_keytype(struct key_type *ktype);
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extern int key_task_permission(const key_ref_t key_ref,
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const struct cred *cred,
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enum key_need_perm need_perm);
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static inline void notify_key(struct key *key,
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enum key_notification_subtype subtype, u32 aux)
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{
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#ifdef CONFIG_KEY_NOTIFICATIONS
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struct key_notification n = {
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.watch.type = WATCH_TYPE_KEY_NOTIFY,
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.watch.subtype = subtype,
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.watch.info = watch_sizeof(n),
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.key_id = key_serial(key),
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.aux = aux,
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};
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post_watch_notification(key->watchers, &n.watch, current_cred(),
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n.key_id);
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#endif
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}
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/*
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* Check to see whether permission is granted to use a key in the desired way.
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*/
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static inline int key_permission(const key_ref_t key_ref,
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enum key_need_perm need_perm)
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{
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return key_task_permission(key_ref, current_cred(), need_perm);
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}
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extern struct key_type key_type_request_key_auth;
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extern struct key *request_key_auth_new(struct key *target,
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const char *op,
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const void *callout_info,
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size_t callout_len,
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struct key *dest_keyring);
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extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
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/*
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* Determine whether a key is dead.
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*/
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static inline bool key_is_dead(const struct key *key, time64_t limit)
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{
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time64_t expiry = key->expiry;
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if (expiry != TIME64_MAX) {
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if (!(key->type->flags & KEY_TYPE_INSTANT_REAP))
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expiry += key_gc_delay;
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if (expiry <= limit)
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return true;
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}
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return
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key->flags & ((1 << KEY_FLAG_DEAD) |
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(1 << KEY_FLAG_INVALIDATED)) ||
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key->domain_tag->removed;
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}
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/*
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* keyctl() functions
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*/
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extern long keyctl_get_keyring_ID(key_serial_t, int);
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extern long keyctl_join_session_keyring(const char __user *);
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extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
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extern long keyctl_revoke_key(key_serial_t);
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extern long keyctl_keyring_clear(key_serial_t);
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extern long keyctl_keyring_link(key_serial_t, key_serial_t);
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extern long keyctl_keyring_move(key_serial_t, key_serial_t, key_serial_t, unsigned int);
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extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
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extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
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extern long keyctl_keyring_search(key_serial_t, const char __user *,
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const char __user *, key_serial_t);
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extern long keyctl_read_key(key_serial_t, char __user *, size_t);
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extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
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extern long keyctl_setperm_key(key_serial_t, key_perm_t);
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extern long keyctl_instantiate_key(key_serial_t, const void __user *,
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size_t, key_serial_t);
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extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
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extern long keyctl_set_reqkey_keyring(int);
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extern long keyctl_set_timeout(key_serial_t, unsigned);
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extern long keyctl_assume_authority(key_serial_t);
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extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
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size_t buflen);
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extern long keyctl_session_to_parent(void);
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extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
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extern long keyctl_instantiate_key_iov(key_serial_t,
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const struct iovec __user *,
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unsigned, key_serial_t);
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extern long keyctl_invalidate_key(key_serial_t);
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extern long keyctl_restrict_keyring(key_serial_t id,
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const char __user *_type,
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const char __user *_restriction);
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#ifdef CONFIG_PERSISTENT_KEYRINGS
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extern long keyctl_get_persistent(uid_t, key_serial_t);
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extern unsigned persistent_keyring_expiry;
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#else
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static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
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{
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return -EOPNOTSUPP;
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}
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#endif
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#ifdef CONFIG_KEY_DH_OPERATIONS
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extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
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size_t, struct keyctl_kdf_params __user *);
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extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
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size_t, struct keyctl_kdf_params *);
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#ifdef CONFIG_COMPAT
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extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
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char __user *buffer, size_t buflen,
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struct compat_keyctl_kdf_params __user *kdf);
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#endif
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#define KEYCTL_KDF_MAX_OUTPUT_LEN 1024 /* max length of KDF output */
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#define KEYCTL_KDF_MAX_OI_LEN 64 /* max length of otherinfo */
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#else
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static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
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char __user *buffer, size_t buflen,
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struct keyctl_kdf_params __user *kdf)
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{
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return -EOPNOTSUPP;
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}
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#ifdef CONFIG_COMPAT
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static inline long compat_keyctl_dh_compute(
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struct keyctl_dh_params __user *params,
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char __user *buffer, size_t buflen,
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struct keyctl_kdf_params __user *kdf)
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{
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return -EOPNOTSUPP;
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}
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#endif
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#endif
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#ifdef CONFIG_ASYMMETRIC_KEY_TYPE
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extern long keyctl_pkey_query(key_serial_t,
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const char __user *,
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struct keyctl_pkey_query __user *);
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extern long keyctl_pkey_verify(const struct keyctl_pkey_params __user *,
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const char __user *,
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const void __user *, const void __user *);
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extern long keyctl_pkey_e_d_s(int,
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const struct keyctl_pkey_params __user *,
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const char __user *,
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const void __user *, void __user *);
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#else
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static inline long keyctl_pkey_query(key_serial_t id,
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const char __user *_info,
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struct keyctl_pkey_query __user *_res)
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{
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return -EOPNOTSUPP;
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}
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static inline long keyctl_pkey_verify(const struct keyctl_pkey_params __user *params,
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const char __user *_info,
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const void __user *_in,
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const void __user *_in2)
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{
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return -EOPNOTSUPP;
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}
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static inline long keyctl_pkey_e_d_s(int op,
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const struct keyctl_pkey_params __user *params,
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const char __user *_info,
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const void __user *_in,
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void __user *_out)
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{
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return -EOPNOTSUPP;
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}
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#endif
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extern long keyctl_capabilities(unsigned char __user *_buffer, size_t buflen);
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#ifdef CONFIG_KEY_NOTIFICATIONS
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extern long keyctl_watch_key(key_serial_t, int, int);
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#else
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static inline long keyctl_watch_key(key_serial_t key_id, int watch_fd, int watch_id)
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{
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return -EOPNOTSUPP;
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}
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#endif
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/*
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* Debugging key validation
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*/
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#ifdef KEY_DEBUGGING
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extern void __key_check(const struct key *);
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static inline void key_check(const struct key *key)
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{
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if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
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__key_check(key);
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}
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#else
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#define key_check(key) do {} while(0)
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#endif
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#endif /* _INTERNAL_H */
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