/* 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			hidden;		/* don't log this record */	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;		struct {			int			argc;		} execve;	};	int fds[2]; #if AUDIT_DEBUG	int		    put_count;	int		    ino_count;#endif}; extern u32 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	32extern 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(__u32 portid, int seq, int type,					int done, int multi,					const void *payload, int size);extern void		    audit_panic(const char *message); struct audit_netlink_list {	__u32 portid;	struct net *net;	struct sk_buff_head q;}; int audit_send_list(void *); struct audit_net {	struct sock *nlsk;}; 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_WATCHextern 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_TREEextern 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_AUDITSYSCALLextern 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;