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/* internal.h: 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/key-type.h>

#include <linux/key-ui.h>

static inline __attribute__((format(printf, 1, 2)))

void no_printk(const char *fmt, ...)

{

}

#ifdef __KDEBUG

#define kenter(FMT, ...) \

        printk(KERN_DEBUG "==> %s("FMT")\n", __FUNCTION__, ##__VA_ARGS__)

#define kleave(FMT, ...) \

        printk(KERN_DEBUG "<== %s()"FMT"\n", __FUNCTION__, ##__VA_ARGS__)

#define kdebug(FMT, ...) \

        printk(KERN_DEBUG "xxx" FMT"yyy\n", ##__VA_ARGS__)

#else

#define kenter(FMT, ...) \

        no_printk(KERN_DEBUG "==> %s("FMT")\n", __FUNCTION__, ##__VA_ARGS__)

#define kleave(FMT, ...) \

        no_printk(KERN_DEBUG "<== %s()"FMT"\n", __FUNCTION__, ##__VA_ARGS__)

#define kdebug(FMT, ...) \

        no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)

#endif

extern struct key_type key_type_user;

/*****************************************************************************/

/*

 * 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)

 * - this also keeps track of keys under request from userspace for this UID

 */

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;

        int                     qnkeys;         /* number of keys allocated to this user */

        int                     qnbytes;        /* number of bytes allocated to this user */

};

#define KEYQUOTA_MAX_KEYS       100

#define KEYQUOTA_MAX_BYTES      10000

#define KEYQUOTA_LINK_BYTES     4               /* a link in a keyring is worth 4 bytes */

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);

extern void key_user_put(struct key_user *user);

extern struct rb_root key_serial_tree;

extern spinlock_t key_serial_lock;

extern struct semaphore key_alloc_sem;

extern struct mutex key_construction_mutex;

extern wait_queue_head_t request_key_conswq;

extern void keyring_publish_name(struct key *keyring);

extern int __key_link(struct key *keyring, struct key *key);

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,

                                    struct task_struct *tsk,

                                    struct key_type *type,

                                    const void *description,

                                    key_match_func_t match);

extern key_ref_t search_process_keyrings(struct key_type *type,

                                         const void *description,

                                         key_match_func_t match,

                                         struct task_struct *tsk);

extern struct key *find_keyring_by_name(const char *name, key_serial_t bound);

extern int install_thread_keyring(struct task_struct *tsk);

extern int install_process_keyring(struct task_struct *tsk);

extern struct key *request_key_and_link(struct key_type *type,

                                        const char *description,

                                        const char *callout_info,

                                        void *aux,

                                        struct key *dest_keyring,

                                        unsigned long flags);

/*

 * request_key authorisation

 */

struct request_key_auth {

        struct key              *target_key;

        struct task_struct      *context;

        char                    *callout_info;

        pid_t                   pid;

};

extern struct key_type key_type_request_key_auth;

extern struct key *request_key_auth_new(struct key *target,

                                        const char *callout_info);

extern struct key *key_get_instantiation_authkey(key_serial_t target_id);

/*

 * 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);

/*

 * 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 */