/* 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>

  #include <uapi/linux/mqueue.h>

  
  /* 0 = no checking
     1 = put_count checking
     2 = verbose put_count checking
  */
  #define AUDIT_DEBUG 0

  /* AUDIT_NAMES is the number of slots we reserve in the audit_context
   * for saving names from getname().  If we get more names we will allocate
   * a name dynamically and also add those to the list anchored by names_list. */
  #define AUDIT_NAMES	5

  /* 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_BUILD_CONTEXT,	/* Create the per-task audit_context,

  				 * and 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_watch;

  struct audit_tree;
  struct audit_chunk;

  struct audit_entry {

  	struct list_head	list;
  	struct rcu_head		rcu;
  	struct audit_krule	rule;

  };

  struct audit_cap_data {
  	kernel_cap_t		permitted;
  	kernel_cap_t		inheritable;
  	union {
  		unsigned int	fE;		/* effective bit of file cap */
  		kernel_cap_t	effective;	/* effective set of process */
  	};
  };
  
  /* When fs/namei.c:getname() is called, we store the pointer in name and
   * we don't let putname() free it (instead we free all of the saved
   * pointers at syscall exit time).
   *
   * Further, in fs/namei.c:path_lookup() we store the inode and device.
   */
  struct audit_names {
  	struct list_head	list;		/* audit_context->names_list */
  
  	struct filename		*name;
  	int			name_len;	/* number of chars to log */
  	bool			name_put;	/* call __putname()? */
  
  	unsigned long		ino;
  	dev_t			dev;
  	umode_t			mode;
  	kuid_t			uid;
  	kgid_t			gid;
  	dev_t			rdev;
  	u32			osid;
  	struct audit_cap_data	fcap;
  	unsigned int		fcap_ver;
  	unsigned char		type;		/* record type */
  	/*
  	 * This was an allocated audit_names and not from the array of
  	 * names allocated in the task audit context.  Thus this name
  	 * should be freed on syscall exit.
  	 */
  	bool			should_free;
  };
  
  /* The per-task audit context. */
  struct audit_context {
  	int		    dummy;	/* must be the first element */
  	int		    in_syscall;	/* 1 if task is in a syscall */
  	enum audit_state    state, current_state;
  	unsigned int	    serial;     /* serial number for record */
  	int		    major;      /* syscall number */
  	struct timespec	    ctime;      /* time of syscall entry */
  	unsigned long	    argv[4];    /* syscall arguments */
  	long		    return_code;/* syscall return code */
  	u64		    prio;
  	int		    return_valid; /* return code is valid */
  	/*
  	 * The names_list is the list of all audit_names collected during this
  	 * syscall.  The first AUDIT_NAMES entries in the names_list will
  	 * actually be from the preallocated_names array for performance
  	 * reasons.  Except during allocation they should never be referenced
  	 * through the preallocated_names array and should only be found/used
  	 * by running the names_list.
  	 */
  	struct audit_names  preallocated_names[AUDIT_NAMES];
  	int		    name_count; /* total records in names_list */
  	struct list_head    names_list;	/* struct audit_names->list anchor */
  	char		    *filterkey;	/* key for rule that triggered record */
  	struct path	    pwd;
  	struct audit_aux_data *aux;
  	struct audit_aux_data *aux_pids;
  	struct sockaddr_storage *sockaddr;
  	size_t sockaddr_len;
  				/* Save things to print about task_struct */
  	pid_t		    pid, ppid;
  	kuid_t		    uid, euid, suid, fsuid;
  	kgid_t		    gid, egid, sgid, fsgid;
  	unsigned long	    personality;
  	int		    arch;
  
  	pid_t		    target_pid;
  	kuid_t		    target_auid;
  	kuid_t		    target_uid;
  	unsigned int	    target_sessionid;
  	u32		    target_sid;
  	char		    target_comm[TASK_COMM_LEN];
  
  	struct audit_tree_refs *trees, *first_trees;
  	struct list_head killed_trees;
  	int tree_count;
  
  	int type;
  	union {
  		struct {
  			int nargs;
  			long args[6];
  		} socketcall;
  		struct {
  			kuid_t			uid;
  			kgid_t			gid;
  			umode_t			mode;
  			u32			osid;
  			int			has_perm;
  			uid_t			perm_uid;
  			gid_t			perm_gid;
  			umode_t			perm_mode;
  			unsigned long		qbytes;
  		} ipc;
  		struct {
  			mqd_t			mqdes;
  			struct mq_attr		mqstat;
  		} mq_getsetattr;
  		struct {
  			mqd_t			mqdes;
  			int			sigev_signo;
  		} mq_notify;
  		struct {
  			mqd_t			mqdes;
  			size_t			msg_len;
  			unsigned int		msg_prio;
  			struct timespec		abs_timeout;
  		} mq_sendrecv;
  		struct {
  			int			oflag;
  			umode_t			mode;
  			struct mq_attr		attr;
  		} mq_open;
  		struct {
  			pid_t			pid;
  			struct audit_cap_data	cap;
  		} capset;
  		struct {
  			int			fd;
  			int			flags;
  		} mmap;
  	};
  	int fds[2];
  
  #if AUDIT_DEBUG
  	int		    put_count;
  	int		    ino_count;
  #endif
  };

  extern int audit_ever_enabled;

  extern void audit_copy_inode(struct audit_names *name,
  			     const struct dentry *dentry,
  			     const struct inode *inode);
  extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
  			  kernel_cap_t *cap);
  extern void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name);
  extern void audit_log_name(struct audit_context *context,
  			   struct audit_names *n, struct path *path,
  			   int record_num, int *call_panic);

  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));
  }

  /* Indicates that audit should log the full pathname. */
  #define AUDIT_NAME_FULL -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_uid_comparator(kuid_t left, u32 op, kuid_t right);
  extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);

  extern int parent_len(const char *path);

  extern int audit_compare_dname_path(const char *dname, const char *path, int plen);

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

  					     const 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 *);

  extern int selinux_audit_rule_update(void);

  extern struct mutex audit_filter_mutex;
  extern void audit_free_rule_rcu(struct rcu_head *);

  extern struct list_head audit_filter_list[];

  extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);

  /* audit watch functions */

  #ifdef CONFIG_AUDIT_WATCH

  extern void audit_put_watch(struct audit_watch *watch);
  extern void audit_get_watch(struct audit_watch *watch);
  extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);

  extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);

  extern void audit_remove_watch_rule(struct audit_krule *krule);

  extern char *audit_watch_path(struct audit_watch *watch);

  extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);

  #else
  #define audit_put_watch(w) {}
  #define audit_get_watch(w) {}
  #define audit_to_watch(k, p, l, o) (-EINVAL)
  #define audit_add_watch(k, l) (-EINVAL)
  #define audit_remove_watch_rule(k) BUG()
  #define audit_watch_path(w) ""
  #define audit_watch_compare(w, i, d) 0
  
  #endif /* CONFIG_AUDIT_WATCH */

  #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 const char *audit_tree_path(struct audit_tree *);
  extern void audit_put_tree(struct audit_tree *);

  extern void audit_kill_trees(struct list_head *);

  #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 */

  #define audit_kill_trees(list) BUG()

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

  extern pid_t audit_sig_pid;

  extern kuid_t audit_sig_uid;

  extern u32 audit_sig_sid;

  #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 void audit_filter_inodes(struct task_struct *, struct audit_context *);

  extern struct list_head *audit_killed_trees(void);

  #else

  #define audit_signal_info(s,t) AUDIT_DISABLED

  #define audit_filter_inodes(t,c) AUDIT_DISABLED

  #endif

  
  extern struct mutex audit_cmd_mutex;