338 lines
10 KiB
C
338 lines
10 KiB
C
/* 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_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_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) {}
|
|
#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
|
|
|
|
#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
|
|
#define audit_mark_path(m) ""
|
|
#define audit_remove_mark(m)
|
|
#define audit_remove_mark_rule(k)
|
|
#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() (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(context) BUG()
|
|
|
|
static inline int audit_signal_info_syscall(struct task_struct *t)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#define audit_filter_inodes(t, c) AUDIT_DISABLED
|
|
#endif /* CONFIG_AUDITSYSCALL */
|
|
|
|
extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
|
|
|
|
extern pid_t audit_sig_pid;
|
|
extern kuid_t audit_sig_uid;
|
|
extern u32 audit_sig_sid;
|
|
|
|
extern int audit_filter(int msgtype, unsigned int listtype);
|
|
|
|
extern void audit_ctl_lock(void);
|
|
extern void audit_ctl_unlock(void);
|