217 lines
6.9 KiB
C
217 lines
6.9 KiB
C
/* internal.h: 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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/key-type.h>
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static inline __attribute__((format(printf, 1, 2)))
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void no_printk(const char *fmt, ...)
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{
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}
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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_user;
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/*****************************************************************************/
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/*
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* keep track of keys for a user
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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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* - this also keeps track of keys under request from userspace for this UID
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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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atomic_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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uid_t uid;
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struct user_namespace *user_ns;
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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(uid_t uid,
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struct user_namespace *user_ns);
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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 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 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(struct key *keyring, struct key *key);
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extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
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const struct key_type *type,
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const char *description,
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key_perm_t perm);
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extern struct key *keyring_search_instkey(struct key *keyring,
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key_serial_t target_id);
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typedef int (*key_match_func_t)(const struct key *, const void *);
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extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
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const struct cred *cred,
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struct key_type *type,
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const void *description,
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key_match_func_t match);
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extern key_ref_t search_process_keyrings(struct key_type *type,
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const void *description,
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key_match_func_t match,
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const struct cred *cred);
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extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
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extern int install_user_keyrings(void);
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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 struct key *request_key_and_link(struct key_type *type,
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const char *description,
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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 key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
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key_perm_t perm);
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extern long join_session_keyring(const char *name);
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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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extern int key_task_permission(const key_ref_t key_ref,
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const struct cred *cred,
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key_perm_t perm);
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static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
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{
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return key_task_permission(key_ref, current_cred(), perm);
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}
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/* required permissions */
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#define KEY_VIEW 0x01 /* require permission to view attributes */
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#define KEY_READ 0x02 /* require permission to read content */
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#define KEY_WRITE 0x04 /* require permission to update / modify */
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#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
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#define KEY_LINK 0x10 /* require permission to link */
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#define KEY_SETATTR 0x20 /* require permission to change attributes */
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#define KEY_ALL 0x3f /* all the above permissions */
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/*
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* request_key authorisation
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*/
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struct request_key_auth {
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struct key *target_key;
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struct key *dest_keyring;
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const struct cred *cred;
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void *callout_info;
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size_t callout_len;
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pid_t pid;
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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 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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* 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_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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/*
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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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