/* 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 */ 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 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 */