kernel/audit.h - kernel/common - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /* 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
  */

 #include <linux/fs.h>
 #include <linux/audit.h>
 #include <linux/skbuff.h>
 #include <uapi/linux/mqueue.h>
 #include <linux/tty.h>

 /* 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_STATE_DISABLED,	/* Do not create per-task audit_context.
 				 * No syscall-specific audit records can
 				 * be generated. */
 	AUDIT_STATE_BUILD,	/* 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_STATE_RECORD	/* 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_fsnotify_mark;
 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 */
 	};
 	kernel_cap_t		ambient;
 	kuid_t			rootid;
 };

 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
  * the refcnt in the associated filename struct.
  *
  * 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 */

 	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;
 };

 struct audit_proctitle {
 	int	len;	/* length of the cmdline field. */
 	char	*value;	/* the cmdline field */
 };

 /* 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 timespec64   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 timespec64	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;
 		struct {
 			char			*name;
 		} module;
 	};
 	int fds[2];
 	struct audit_proctitle proctitle;
 };

 extern bool audit_ever_enabled;

 extern void audit_log_session_info(struct audit_buffer *ab);

 extern int auditd_test_task(struct task_struct *task);

 #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 struct qstr *dname, const char *path, int plen);
 extern struct sk_buff *audit_make_reply(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_thread(void *_dest);

 extern int selinux_audit_rule_update(void);

 extern struct mutex audit_filter_mutex;
 extern int audit_del_rule(struct audit_entry *entry);
 extern void audit_free_rule_rcu(struct rcu_head *head);
 extern struct list_head audit_filter_list[];

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

 extern void audit_log_d_path_exe(struct audit_buffer *ab,
 				 struct mm_struct *mm);

 extern struct tty_struct *audit_get_tty(void);
 extern void audit_put_tty(struct tty_struct *tty);

 /* audit watch/mark/tree functions */
 #ifdef CONFIG_AUDITSYSCALL
 extern unsigned int audit_serial(void);
 extern int auditsc_get_stamp(struct audit_context *ctx,
 			      struct timespec64 *t, unsigned int *serial);

 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);

 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
 						    char *pathname, int len);
 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
 extern void audit_remove_mark_rule(struct audit_krule *krule);
 extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
 			      unsigned long ino, dev_t dev);
 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
 extern int audit_exe_compare(struct task_struct *tsk,
 			     struct audit_fsnotify_mark *mark);

 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
 extern void audit_put_chunk(struct audit_chunk *chunk);
 extern bool audit_tree_match(struct audit_chunk *chunk,
 			     struct audit_tree *tree);
 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
 extern int audit_add_tree_rule(struct audit_krule *rule);
 extern int audit_remove_tree_rule(struct audit_krule *rule);
 extern void audit_trim_trees(void);
 extern int audit_tag_tree(char *old, char *new);
 extern const char *audit_tree_path(struct audit_tree *tree);
 extern void audit_put_tree(struct audit_tree *tree);
 extern void audit_kill_trees(struct audit_context *context);

 extern int audit_signal_info_syscall(struct task_struct *t);
 extern void audit_filter_inodes(struct task_struct *tsk,
 				struct audit_context *ctx);
 extern struct list_head *audit_killed_trees(void);
 #else /* CONFIG_AUDITSYSCALL */
 #define auditsc_get_stamp(c, t, s) 0
 #define audit_put_watch(w) do { } while (0)
 #define audit_get_watch(w) do { } while (0)
 #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

 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
 #define audit_mark_path(m) ""
 #define audit_remove_mark(m) do { } while (0)
 #define audit_remove_mark_rule(k) do { } while (0)
 #define audit_mark_compare(m, i, d) 0
 #define audit_exe_compare(t, m) (-EINVAL)
 #define audit_dupe_exe(n, o) (-EINVAL)

 #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() do { } while (0)
 #define audit_put_tree(tree) do { } while (0)
 #define audit_tag_tree(old, new) -EINVAL
 #define audit_tree_path(rule) ""	/* never called */
 #define audit_kill_trees(context) BUG()

 static inline int audit_signal_info_syscall(struct task_struct *t)
 {
 	return 0;
 }

 #define audit_filter_inodes(t, c) AUDIT_STATE_DISABLED
 #endif /* CONFIG_AUDITSYSCALL */

 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);

 extern int audit_filter(int msgtype, unsigned int listtype);

 extern void audit_ctl_lock(void);
 extern void audit_ctl_unlock(void);
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/* 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
	*/

	#include <linux/fs.h>
	#include <linux/audit.h>
	#include <linux/skbuff.h>
	#include <uapi/linux/mqueue.h>
	#include <linux/tty.h>

	/* 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_STATE_DISABLED, /* Do not create per-task audit_context.
	* No syscall-specific audit records can
	* be generated. */
	AUDIT_STATE_BUILD, /* 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_STATE_RECORD /* 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_fsnotify_mark;
	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 */
	};
	kernel_cap_t ambient;
	kuid_t rootid;
	};

	/* When fs/namei.c:getname() is called, we store the pointer in name and bump
	* the refcnt in the associated filename struct.
	*
	* 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 */

	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;
	};

	struct audit_proctitle {
	int len; /* length of the cmdline field. */
	char value; / the cmdline field */
	};

	/* 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 timespec64 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 timespec64 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;
	struct {
	char *name;
	} module;
	};
	int fds[2];
	struct audit_proctitle proctitle;
	};

	extern bool audit_ever_enabled;

	extern void audit_log_session_info(struct audit_buffer *ab);

	extern int auditd_test_task(struct task_struct *task);

	#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 struct qstr dname, const char path, int plen);
	extern struct sk_buff *audit_make_reply(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_thread(void *_dest);

	extern int selinux_audit_rule_update(void);

	extern struct mutex audit_filter_mutex;
	extern int audit_del_rule(struct audit_entry *entry);
	extern void audit_free_rule_rcu(struct rcu_head *head);
	extern struct list_head audit_filter_list[];

	extern struct audit_entry audit_dupe_rule(struct audit_krule old);

	extern void audit_log_d_path_exe(struct audit_buffer *ab,
	struct mm_struct *mm);

	extern struct tty_struct *audit_get_tty(void);
	extern void audit_put_tty(struct tty_struct *tty);

	/* audit watch/mark/tree functions */
	#ifdef CONFIG_AUDITSYSCALL
	extern unsigned int audit_serial(void);
	extern int auditsc_get_stamp(struct audit_context *ctx,
	struct timespec64 t, unsigned int serial);

	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);

	extern struct audit_fsnotify_mark audit_alloc_mark(struct audit_krule krule,
	char *pathname, int len);
	extern char audit_mark_path(struct audit_fsnotify_mark mark);
	extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
	extern void audit_remove_mark_rule(struct audit_krule *krule);
	extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
	unsigned long ino, dev_t dev);
	extern int audit_dupe_exe(struct audit_krule new, struct audit_krule old);
	extern int audit_exe_compare(struct task_struct *tsk,
	struct audit_fsnotify_mark *mark);

	extern struct audit_chunk audit_tree_lookup(const struct inode inode);
	extern void audit_put_chunk(struct audit_chunk *chunk);
	extern bool audit_tree_match(struct audit_chunk *chunk,
	struct audit_tree *tree);
	extern int audit_make_tree(struct audit_krule rule, char pathname, u32 op);
	extern int audit_add_tree_rule(struct audit_krule *rule);
	extern int audit_remove_tree_rule(struct audit_krule *rule);
	extern void audit_trim_trees(void);
	extern int audit_tag_tree(char old, char new);
	extern const char audit_tree_path(struct audit_tree tree);
	extern void audit_put_tree(struct audit_tree *tree);
	extern void audit_kill_trees(struct audit_context *context);

	extern int audit_signal_info_syscall(struct task_struct *t);
	extern void audit_filter_inodes(struct task_struct *tsk,
	struct audit_context *ctx);
	extern struct list_head *audit_killed_trees(void);
	#else /* CONFIG_AUDITSYSCALL */
	#define auditsc_get_stamp(c, t, s) 0
	#define audit_put_watch(w) do { } while (0)
	#define audit_get_watch(w) do { } while (0)
	#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

	#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
	#define audit_mark_path(m) ""
	#define audit_remove_mark(m) do { } while (0)
	#define audit_remove_mark_rule(k) do { } while (0)
	#define audit_mark_compare(m, i, d) 0
	#define audit_exe_compare(t, m) (-EINVAL)
	#define audit_dupe_exe(n, o) (-EINVAL)

	#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() do { } while (0)
	#define audit_put_tree(tree) do { } while (0)
	#define audit_tag_tree(old, new) -EINVAL
	#define audit_tree_path(rule) "" /* never called */
	#define audit_kill_trees(context) BUG()

	static inline int audit_signal_info_syscall(struct task_struct *t)
	{
	return 0;
	}

	#define audit_filter_inodes(t, c) AUDIT_STATE_DISABLED
	#endif /* CONFIG_AUDITSYSCALL */

	extern char audit_unpack_string(void bufp, size_t remain, size_t len);

	extern int audit_filter(int msgtype, unsigned int listtype);

	extern void audit_ctl_lock(void);
	extern void audit_ctl_unlock(void);