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/* audit -- definition of audit_context structure and supporting types

 *

 * Copyright 2003-2004 Red Hat, Inc.

 * Copyright 2005 Hewlett-Packard Development Company, L.P.

 * Copyright 2005 IBM Corporation

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#include <linux/fs.h>

#include <linux/audit.h>

#include <linux/skbuff.h>

/* 0 = no checking

   1 = put_count checking

   2 = verbose put_count checking

*/

#define AUDIT_DEBUG 0

/* At task start time, the audit_state is set in the audit_context using

   a per-task filter.  At syscall entry, the audit_state is augmented by

   the syscall filter. */

enum audit_state {

        AUDIT_DISABLED,         /* Do not create per-task audit_context.

                                 * No syscall-specific audit records can

                                 * be generated. */

        AUDIT_SETUP_CONTEXT,    /* Create the per-task audit_context,

                                 * but don't necessarily fill it in at

                                 * syscall entry time (i.e., filter

                                 * instead). */

        AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,

                                 * and always fill it in at syscall

                                 * entry time.  This makes a full

                                 * syscall record available if some

                                 * other part of the kernel decides it

                                 * should be recorded. */

        AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,

                                 * always fill it in at syscall entry

                                 * time, and always write out the audit

                                 * record at syscall exit time.  */

};

/* Rule lists */

struct audit_parent;

struct audit_watch {

        atomic_t                count;  /* reference count */

        char                    *path;  /* insertion path */

        dev_t                   dev;    /* associated superblock device */

        unsigned long           ino;    /* associated inode number */

        struct audit_parent     *parent; /* associated parent */

        struct list_head        wlist;  /* entry in parent->watches list */

        struct list_head        rules;  /* associated rules */

};

struct audit_field {

        u32                             type;

        u32                             val;

        u32                             op;

        char                            *se_str;

        struct selinux_audit_rule       *se_rule;

};

struct audit_tree;

struct audit_chunk;

struct audit_krule {

        int                     vers_ops;

        u32                     flags;

        u32                     listnr;

        u32                     action;

        u32                     mask[AUDIT_BITMASK_SIZE];

        u32                     buflen; /* for data alloc on list rules */

        u32                     field_count;

        char                    *filterkey; /* ties events to rules */

        struct audit_field      *fields;

        struct audit_field      *arch_f; /* quick access to arch field */

        struct audit_field      *inode_f; /* quick access to an inode field */

        struct audit_watch      *watch; /* associated watch */

        struct audit_tree       *tree;  /* associated watched tree */

        struct list_head        rlist;  /* entry in audit_{watch,tree}.rules list */

};

struct audit_entry {

        struct list_head        list;

        struct rcu_head         rcu;

        struct audit_krule      rule;

};

extern int audit_pid;

#define AUDIT_INODE_BUCKETS     32

extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];

static inline int audit_hash_ino(u32 ino)

{

        return (ino & (AUDIT_INODE_BUCKETS-1));

}

extern int audit_match_class(int class, unsigned syscall);

extern int audit_comparator(const u32 left, const u32 op, const u32 right);

extern int audit_compare_dname_path(const char *dname, const char *path,

                                    int *dirlen);

extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,

                                             int done, int multi,

                                             void *payload, int size);

extern void                 audit_send_reply(int pid, int seq, int type,

                                             int done, int multi,

                                             void *payload, int size);

extern void                 audit_panic(const char *message);

struct audit_netlink_list {

        int pid;

        struct sk_buff_head q;

};

int audit_send_list(void *);

struct inotify_watch;

extern void audit_free_parent(struct inotify_watch *);

extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,

                                const char *, struct inode *);

extern int selinux_audit_rule_update(void);

extern struct mutex audit_filter_mutex;

extern void audit_free_rule_rcu(struct rcu_head *);

#ifdef CONFIG_AUDIT_TREE

extern struct audit_chunk *audit_tree_lookup(const struct inode *);

extern void audit_put_chunk(struct audit_chunk *);

extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);

extern int audit_make_tree(struct audit_krule *, char *, u32);

extern int audit_add_tree_rule(struct audit_krule *);

extern int audit_remove_tree_rule(struct audit_krule *);

extern void audit_trim_trees(void);

extern int audit_tag_tree(char *old, char *new);

extern void audit_schedule_prune(void);

extern void audit_prune_trees(void);

extern const char *audit_tree_path(struct audit_tree *);

extern void audit_put_tree(struct audit_tree *);

#else

#define audit_remove_tree_rule(rule) BUG()

#define audit_add_tree_rule(rule) -EINVAL

#define audit_make_tree(rule, str, op) -EINVAL

#define audit_trim_trees() (void)0

#define audit_put_tree(tree) (void)0

#define audit_tag_tree(old, new) -EINVAL

#define audit_tree_path(rule) ""        /* never called */

#endif

extern char *audit_unpack_string(void **, size_t *, size_t);

#ifdef CONFIG_AUDITSYSCALL

extern int __audit_signal_info(int sig, struct task_struct *t);

static inline int audit_signal_info(int sig, struct task_struct *t)

{

        if (unlikely((audit_pid && t->tgid == audit_pid) ||

                     (audit_signals && !audit_dummy_context())))

                return __audit_signal_info(sig, t);

        return 0;

}

extern enum audit_state audit_filter_inodes(struct task_struct *,

                                            struct audit_context *);

extern void audit_set_auditable(struct audit_context *);

#else

#define audit_signal_info(s,t) AUDIT_DISABLED

#define audit_filter_inodes(t,c) AUDIT_DISABLED

#define audit_set_auditable(c)

#endif