kernel/audit.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* audit -- definition of audit_context structure and supporting types
   3  *
   4  * Copyright 2003-2004 Red Hat, Inc.
   5  * Copyright 2005 Hewlett-Packard Development Company, L.P.
   6  * Copyright 2005 IBM Corporation
   7  */
   8
   9 #include <linux/fs.h>
  10 #include <linux/audit.h>
  11 #include <linux/skbuff.h>
  12 #include <uapi/linux/mqueue.h>
  13 #include <linux/tty.h>
  14
  15 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
  16  * for saving names from getname().  If we get more names we will allocate
  17  * a name dynamically and also add those to the list anchored by names_list. */
  18 #define AUDIT_NAMES     5
  19
  20 /* At task start time, the audit_state is set in the audit_context using
  21    a per-task filter.  At syscall entry, the audit_state is augmented by
  22    the syscall filter. */
  23 enum audit_state {
  24         AUDIT_DISABLED,         /* Do not create per-task audit_context.
  25                                  * No syscall-specific audit records can
  26                                  * be generated. */
  27         AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
  28                                  * and fill it in at syscall
  29                                  * entry time.  This makes a full
  30                                  * syscall record available if some
  31                                  * other part of the kernel decides it
  32                                  * should be recorded. */
  33         AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
  34                                  * always fill it in at syscall entry
  35                                  * time, and always write out the audit
  36                                  * record at syscall exit time.  */
  37 };
  38
  39 /* Rule lists */
  40 struct audit_watch;
  41 struct audit_fsnotify_mark;
  42 struct audit_tree;
  43 struct audit_chunk;
  44
  45 struct audit_entry {
  46         struct list_head        list;
  47         struct rcu_head         rcu;
  48         struct audit_krule      rule;
  49 };
  50
  51 struct audit_cap_data {
  52         kernel_cap_t            permitted;
  53         kernel_cap_t            inheritable;
  54         union {
  55                 unsigned int    fE;             /* effective bit of file cap */
  56                 kernel_cap_t    effective;      /* effective set of process */
  57         };
  58         kernel_cap_t            ambient;
  59         kuid_t                  rootid;
  60 };
  61
  62 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
  63  * the refcnt in the associated filename struct.
  64  *
  65  * Further, in fs/namei.c:path_lookup() we store the inode and device.
  66  */
  67 struct audit_names {
  68         struct list_head        list;           /* audit_context->names_list */
  69
  70         struct filename         *name;
  71         int                     name_len;       /* number of chars to log */
  72         bool                    hidden;         /* don't log this record */
  73
  74         unsigned long           ino;
  75         dev_t                   dev;
  76         umode_t                 mode;
  77         kuid_t                  uid;
  78         kgid_t                  gid;
  79         dev_t                   rdev;
  80         u32                     osid;
  81         struct audit_cap_data   fcap;
  82         unsigned int            fcap_ver;
  83         unsigned char           type;           /* record type */
  84         /*
  85          * This was an allocated audit_names and not from the array of
  86          * names allocated in the task audit context.  Thus this name
  87          * should be freed on syscall exit.
  88          */
  89         bool                    should_free;
  90 };
  91
  92 struct audit_proctitle {
  93         int     len;    /* length of the cmdline field. */
  94         char    *value; /* the cmdline field */
  95 };
  96
  97 /* The per-task audit context. */
  98 struct audit_context {
  99         int                 dummy;      /* must be the first element */
 100         int                 in_syscall; /* 1 if task is in a syscall */
 101         enum audit_state    state, current_state;
 102         unsigned int        serial;     /* serial number for record */
 103         int                 major;      /* syscall number */
 104         struct timespec64   ctime;      /* time of syscall entry */
 105         unsigned long       argv[4];    /* syscall arguments */
 106         long                return_code;/* syscall return code */
 107         u64                 prio;
 108         int                 return_valid; /* return code is valid */
 109         /*
 110          * The names_list is the list of all audit_names collected during this
 111          * syscall.  The first AUDIT_NAMES entries in the names_list will
 112          * actually be from the preallocated_names array for performance
 113          * reasons.  Except during allocation they should never be referenced
 114          * through the preallocated_names array and should only be found/used
 115          * by running the names_list.
 116          */
 117         struct audit_names  preallocated_names[AUDIT_NAMES];
 118         int                 name_count; /* total records in names_list */
 119         struct list_head    names_list; /* struct audit_names->list anchor */
 120         char                *filterkey; /* key for rule that triggered record */
 121         struct path         pwd;
 122         struct audit_aux_data *aux;
 123         struct audit_aux_data *aux_pids;
 124         struct sockaddr_storage *sockaddr;
 125         size_t sockaddr_len;
 126                                 /* Save things to print about task_struct */
 127         pid_t               pid, ppid;
 128         kuid_t              uid, euid, suid, fsuid;
 129         kgid_t              gid, egid, sgid, fsgid;
 130         unsigned long       personality;
 131         int                 arch;
 132
 133         pid_t               target_pid;
 134         kuid_t              target_auid;
 135         kuid_t              target_uid;
 136         unsigned int        target_sessionid;
 137         u32                 target_sid;
 138         char                target_comm[TASK_COMM_LEN];
 139
 140         struct audit_tree_refs *trees, *first_trees;
 141         struct list_head killed_trees;
 142         int tree_count;
 143
 144         int type;
 145         union {
 146                 struct {
 147                         int nargs;
 148                         long args[6];
 149                 } socketcall;
 150                 struct {
 151                         kuid_t                  uid;
 152                         kgid_t                  gid;
 153                         umode_t                 mode;
 154                         u32                     osid;
 155                         int                     has_perm;
 156                         uid_t                   perm_uid;
 157                         gid_t                   perm_gid;
 158                         umode_t                 perm_mode;
 159                         unsigned long           qbytes;
 160                 } ipc;
 161                 struct {
 162                         mqd_t                   mqdes;
 163                         struct mq_attr          mqstat;
 164                 } mq_getsetattr;
 165                 struct {
 166                         mqd_t                   mqdes;
 167                         int                     sigev_signo;
 168                 } mq_notify;
 169                 struct {
 170                         mqd_t                   mqdes;
 171                         size_t                  msg_len;
 172                         unsigned int            msg_prio;
 173                         struct timespec64       abs_timeout;
 174                 } mq_sendrecv;
 175                 struct {
 176                         int                     oflag;
 177                         umode_t                 mode;
 178                         struct mq_attr          attr;
 179                 } mq_open;
 180                 struct {
 181                         pid_t                   pid;
 182                         struct audit_cap_data   cap;
 183                 } capset;
 184                 struct {
 185                         int                     fd;
 186                         int                     flags;
 187                 } mmap;
 188                 struct {
 189                         int                     argc;
 190                 } execve;
 191                 struct {
 192                         char                    *name;
 193                 } module;
 194         };
 195         int fds[2];
 196         struct audit_proctitle proctitle;
 197 };
 198
 199 extern bool audit_ever_enabled;
 200
 201 extern void audit_log_session_info(struct audit_buffer *ab);
 202
 203 extern int auditd_test_task(struct task_struct *task);
 204
 205 #define AUDIT_INODE_BUCKETS     32
 206 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 207
 208 static inline int audit_hash_ino(u32 ino)
 209 {
 210         return (ino & (AUDIT_INODE_BUCKETS-1));
 211 }
 212
 213 /* Indicates that audit should log the full pathname. */
 214 #define AUDIT_NAME_FULL -1
 215
 216 extern int audit_match_class(int class, unsigned syscall);
 217 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
 218 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
 219 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
 220 extern int parent_len(const char *path);
 221 extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen);
 222 extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
 223                                         const void *payload, int size);
 224 extern void                 audit_panic(const char *message);
 225
 226 struct audit_netlink_list {
 227         __u32 portid;
 228         struct net *net;
 229         struct sk_buff_head q;
 230 };
 231
 232 int audit_send_list_thread(void *_dest);
 233
 234 extern int selinux_audit_rule_update(void);
 235
 236 extern struct mutex audit_filter_mutex;
 237 extern int audit_del_rule(struct audit_entry *entry);
 238 extern void audit_free_rule_rcu(struct rcu_head *head);
 239 extern struct list_head audit_filter_list[];
 240
 241 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
 242
 243 extern void audit_log_d_path_exe(struct audit_buffer *ab,
 244                                  struct mm_struct *mm);
 245
 246 extern struct tty_struct *audit_get_tty(void);
 247 extern void audit_put_tty(struct tty_struct *tty);
 248
 249 /* audit watch/mark/tree functions */
 250 #ifdef CONFIG_AUDITSYSCALL
 251 extern unsigned int audit_serial(void);
 252 extern int auditsc_get_stamp(struct audit_context *ctx,
 253                               struct timespec64 *t, unsigned int *serial);
 254
 255 extern void audit_put_watch(struct audit_watch *watch);
 256 extern void audit_get_watch(struct audit_watch *watch);
 257 extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
 258                           u32 op);
 259 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
 260 extern void audit_remove_watch_rule(struct audit_krule *krule);
 261 extern char *audit_watch_path(struct audit_watch *watch);
 262 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
 263                                dev_t dev);
 264
 265 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
 266                                                     char *pathname, int len);
 267 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
 268 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
 269 extern void audit_remove_mark_rule(struct audit_krule *krule);
 270 extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
 271                               unsigned long ino, dev_t dev);
 272 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
 273 extern int audit_exe_compare(struct task_struct *tsk,
 274                              struct audit_fsnotify_mark *mark);
 275
 276 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
 277 extern void audit_put_chunk(struct audit_chunk *chunk);
 278 extern bool audit_tree_match(struct audit_chunk *chunk,
 279                              struct audit_tree *tree);
 280 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
 281 extern int audit_add_tree_rule(struct audit_krule *rule);
 282 extern int audit_remove_tree_rule(struct audit_krule *rule);
 283 extern void audit_trim_trees(void);
 284 extern int audit_tag_tree(char *old, char *new);
 285 extern const char *audit_tree_path(struct audit_tree *tree);
 286 extern void audit_put_tree(struct audit_tree *tree);
 287 extern void audit_kill_trees(struct audit_context *context);
 288
 289 extern int audit_signal_info_syscall(struct task_struct *t);
 290 extern void audit_filter_inodes(struct task_struct *tsk,
 291                                 struct audit_context *ctx);
 292 extern struct list_head *audit_killed_trees(void);
 293 #else /* CONFIG_AUDITSYSCALL */
 294 #define auditsc_get_stamp(c, t, s) 0
 295 #define audit_put_watch(w) {}
 296 #define audit_get_watch(w) {}
 297 #define audit_to_watch(k, p, l, o) (-EINVAL)
 298 #define audit_add_watch(k, l) (-EINVAL)
 299 #define audit_remove_watch_rule(k) BUG()
 300 #define audit_watch_path(w) ""
 301 #define audit_watch_compare(w, i, d) 0
 302
 303 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
 304 #define audit_mark_path(m) ""
 305 #define audit_remove_mark(m)
 306 #define audit_remove_mark_rule(k)
 307 #define audit_mark_compare(m, i, d) 0
 308 #define audit_exe_compare(t, m) (-EINVAL)
 309 #define audit_dupe_exe(n, o) (-EINVAL)
 310
 311 #define audit_remove_tree_rule(rule) BUG()
 312 #define audit_add_tree_rule(rule) -EINVAL
 313 #define audit_make_tree(rule, str, op) -EINVAL
 314 #define audit_trim_trees() (void)0
 315 #define audit_put_tree(tree) (void)0
 316 #define audit_tag_tree(old, new) -EINVAL
 317 #define audit_tree_path(rule) ""        /* never called */
 318 #define audit_kill_trees(context) BUG()
 319
 320 static inline int audit_signal_info_syscall(struct task_struct *t)
 321 {
 322         return 0;
 323 }
 324
 325 #define audit_filter_inodes(t, c) AUDIT_DISABLED
 326 #endif /* CONFIG_AUDITSYSCALL */
 327
 328 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
 329
 330 extern int audit_filter(int msgtype, unsigned int listtype);
 331
 332 extern void audit_ctl_lock(void);
 333 extern void audit_ctl_unlock(void);