kernel/audit.h

   1 /* audit -- definition of audit_context structure and supporting types
   2  *
   3  * Copyright 2003-2004 Red Hat, Inc.
   4  * Copyright 2005 Hewlett-Packard Development Company, L.P.
   5  * Copyright 2005 IBM Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/audit.h>
  24 #include <linux/skbuff.h>
  25 #include <uapi/linux/mqueue.h>
  26 #include <linux/tty.h>
  27
  28 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
  29  * for saving names from getname().  If we get more names we will allocate
  30  * a name dynamically and also add those to the list anchored by names_list. */
  31 #define AUDIT_NAMES     5
  32
  33 /* At task start time, the audit_state is set in the audit_context using
  34    a per-task filter.  At syscall entry, the audit_state is augmented by
  35    the syscall filter. */
  36 enum audit_state {
  37         AUDIT_DISABLED,         /* Do not create per-task audit_context.
  38                                  * No syscall-specific audit records can
  39                                  * be generated. */
  40         AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
  41                                  * and fill it in at syscall
  42                                  * entry time.  This makes a full
  43                                  * syscall record available if some
  44                                  * other part of the kernel decides it
  45                                  * should be recorded. */
  46         AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
  47                                  * always fill it in at syscall entry
  48                                  * time, and always write out the audit
  49                                  * record at syscall exit time.  */
  50 };
  51
  52 /* Rule lists */
  53 struct audit_watch;
  54 struct audit_fsnotify_mark;
  55 struct audit_tree;
  56 struct audit_chunk;
  57
  58 struct audit_entry {
  59         struct list_head        list;
  60         struct rcu_head         rcu;
  61         struct audit_krule      rule;
  62 };
  63
  64 struct audit_cap_data {
  65         kernel_cap_t            permitted;
  66         kernel_cap_t            inheritable;
  67         union {
  68                 unsigned int    fE;             /* effective bit of file cap */
  69                 kernel_cap_t    effective;      /* effective set of process */
  70         };
  71         kernel_cap_t            ambient;
  72         kuid_t                  rootid;
  73 };
  74
  75 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
  76  * the refcnt in the associated filename struct.
  77  *
  78  * Further, in fs/namei.c:path_lookup() we store the inode and device.
  79  */
  80 struct audit_names {
  81         struct list_head        list;           /* audit_context->names_list */
  82
  83         struct filename         *name;
  84         int                     name_len;       /* number of chars to log */
  85         bool                    hidden;         /* don't log this record */
  86
  87         unsigned long           ino;
  88         dev_t                   dev;
  89         umode_t                 mode;
  90         kuid_t                  uid;
  91         kgid_t                  gid;
  92         dev_t                   rdev;
  93         u32                     osid;
  94         struct audit_cap_data   fcap;
  95         unsigned int            fcap_ver;
  96         unsigned char           type;           /* record type */
  97         /*
  98          * This was an allocated audit_names and not from the array of
  99          * names allocated in the task audit context.  Thus this name
 100          * should be freed on syscall exit.
 101          */
 102         bool                    should_free;
 103 };
 104
 105 struct audit_proctitle {
 106         int     len;    /* length of the cmdline field. */
 107         char    *value; /* the cmdline field */
 108 };
 109
 110 /* The per-task audit context. */
 111 struct audit_context {
 112         int                 dummy;      /* must be the first element */
 113         int                 in_syscall; /* 1 if task is in a syscall */
 114         enum audit_state    state, current_state;
 115         unsigned int        serial;     /* serial number for record */
 116         int                 major;      /* syscall number */
 117         struct timespec64   ctime;      /* time of syscall entry */
 118         unsigned long       argv[4];    /* syscall arguments */
 119         long                return_code;/* syscall return code */
 120         u64                 prio;
 121         int                 return_valid; /* return code is valid */
 122         /*
 123          * The names_list is the list of all audit_names collected during this
 124          * syscall.  The first AUDIT_NAMES entries in the names_list will
 125          * actually be from the preallocated_names array for performance
 126          * reasons.  Except during allocation they should never be referenced
 127          * through the preallocated_names array and should only be found/used
 128          * by running the names_list.
 129          */
 130         struct audit_names  preallocated_names[AUDIT_NAMES];
 131         int                 name_count; /* total records in names_list */
 132         struct list_head    names_list; /* struct audit_names->list anchor */
 133         char                *filterkey; /* key for rule that triggered record */
 134         struct path         pwd;
 135         struct audit_aux_data *aux;
 136         struct audit_aux_data *aux_pids;
 137         struct sockaddr_storage *sockaddr;
 138         size_t sockaddr_len;
 139                                 /* Save things to print about task_struct */
 140         pid_t               pid, ppid;
 141         kuid_t              uid, euid, suid, fsuid;
 142         kgid_t              gid, egid, sgid, fsgid;
 143         unsigned long       personality;
 144         int                 arch;
 145
 146         pid_t               target_pid;
 147         kuid_t              target_auid;
 148         kuid_t              target_uid;
 149         unsigned int        target_sessionid;
 150         u32                 target_sid;
 151         char                target_comm[TASK_COMM_LEN];
 152
 153         struct audit_tree_refs *trees, *first_trees;
 154         struct list_head killed_trees;
 155         int tree_count;
 156
 157         int type;
 158         union {
 159                 struct {
 160                         int nargs;
 161                         long args[6];
 162                 } socketcall;
 163                 struct {
 164                         kuid_t                  uid;
 165                         kgid_t                  gid;
 166                         umode_t                 mode;
 167                         u32                     osid;
 168                         int                     has_perm;
 169                         uid_t                   perm_uid;
 170                         gid_t                   perm_gid;
 171                         umode_t                 perm_mode;
 172                         unsigned long           qbytes;
 173                 } ipc;
 174                 struct {
 175                         mqd_t                   mqdes;
 176                         struct mq_attr          mqstat;
 177                 } mq_getsetattr;
 178                 struct {
 179                         mqd_t                   mqdes;
 180                         int                     sigev_signo;
 181                 } mq_notify;
 182                 struct {
 183                         mqd_t                   mqdes;
 184                         size_t                  msg_len;
 185                         unsigned int            msg_prio;
 186                         struct timespec64       abs_timeout;
 187                 } mq_sendrecv;
 188                 struct {
 189                         int                     oflag;
 190                         umode_t                 mode;
 191                         struct mq_attr          attr;
 192                 } mq_open;
 193                 struct {
 194                         pid_t                   pid;
 195                         struct audit_cap_data   cap;
 196                 } capset;
 197                 struct {
 198                         int                     fd;
 199                         int                     flags;
 200                 } mmap;
 201                 struct {
 202                         int                     argc;
 203                 } execve;
 204                 struct {
 205                         char                    *name;
 206                 } module;
 207         };
 208         int fds[2];
 209         struct audit_proctitle proctitle;
 210 };
 211
 212 extern bool audit_ever_enabled;
 213
 214 extern void audit_log_session_info(struct audit_buffer *ab);
 215
 216 extern int auditd_test_task(struct task_struct *task);
 217
 218 #define AUDIT_INODE_BUCKETS     32
 219 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 220
 221 static inline int audit_hash_ino(u32 ino)
 222 {
 223         return (ino & (AUDIT_INODE_BUCKETS-1));
 224 }
 225
 226 /* Indicates that audit should log the full pathname. */
 227 #define AUDIT_NAME_FULL -1
 228
 229 extern int audit_match_class(int class, unsigned syscall);
 230 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
 231 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
 232 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
 233 extern int parent_len(const char *path);
 234 extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
 235 extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
 236                                         const void *payload, int size);
 237 extern void                 audit_panic(const char *message);
 238
 239 struct audit_netlink_list {
 240         __u32 portid;
 241         struct net *net;
 242         struct sk_buff_head q;
 243 };
 244
 245 int audit_send_list(void *_dest);
 246
 247 extern int selinux_audit_rule_update(void);
 248
 249 extern struct mutex audit_filter_mutex;
 250 extern int audit_del_rule(struct audit_entry *entry);
 251 extern void audit_free_rule_rcu(struct rcu_head *head);
 252 extern struct list_head audit_filter_list[];
 253
 254 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
 255
 256 extern void audit_log_d_path_exe(struct audit_buffer *ab,
 257                                  struct mm_struct *mm);
 258
 259 extern struct tty_struct *audit_get_tty(void);
 260 extern void audit_put_tty(struct tty_struct *tty);
 261
 262 /* audit watch/mark/tree functions */
 263 #ifdef CONFIG_AUDITSYSCALL
 264 extern unsigned int audit_serial(void);
 265 extern int auditsc_get_stamp(struct audit_context *ctx,
 266                               struct timespec64 *t, unsigned int *serial);
 267
 268 extern void audit_put_watch(struct audit_watch *watch);
 269 extern void audit_get_watch(struct audit_watch *watch);
 270 extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
 271                           u32 op);
 272 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
 273 extern void audit_remove_watch_rule(struct audit_krule *krule);
 274 extern char *audit_watch_path(struct audit_watch *watch);
 275 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
 276                                dev_t dev);
 277
 278 extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
 279                                                     char *pathname, int len);
 280 extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
 281 extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
 282 extern void audit_remove_mark_rule(struct audit_krule *krule);
 283 extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
 284                               unsigned long ino, dev_t dev);
 285 extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
 286 extern int audit_exe_compare(struct task_struct *tsk,
 287                              struct audit_fsnotify_mark *mark);
 288
 289 extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
 290 extern void audit_put_chunk(struct audit_chunk *chunk);
 291 extern bool audit_tree_match(struct audit_chunk *chunk,
 292                              struct audit_tree *tree);
 293 extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
 294 extern int audit_add_tree_rule(struct audit_krule *rule);
 295 extern int audit_remove_tree_rule(struct audit_krule *rule);
 296 extern void audit_trim_trees(void);
 297 extern int audit_tag_tree(char *old, char *new);
 298 extern const char *audit_tree_path(struct audit_tree *tree);
 299 extern void audit_put_tree(struct audit_tree *tree);
 300 extern void audit_kill_trees(struct audit_context *context);
 301
 302 extern int audit_signal_info(int sig, struct task_struct *t);
 303 extern void audit_filter_inodes(struct task_struct *tsk,
 304                                 struct audit_context *ctx);
 305 extern struct list_head *audit_killed_trees(void);
 306 #else /* CONFIG_AUDITSYSCALL */
 307 #define auditsc_get_stamp(c, t, s) 0
 308 #define audit_put_watch(w) {}
 309 #define audit_get_watch(w) {}
 310 #define audit_to_watch(k, p, l, o) (-EINVAL)
 311 #define audit_add_watch(k, l) (-EINVAL)
 312 #define audit_remove_watch_rule(k) BUG()
 313 #define audit_watch_path(w) ""
 314 #define audit_watch_compare(w, i, d) 0
 315
 316 #define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
 317 #define audit_mark_path(m) ""
 318 #define audit_remove_mark(m)
 319 #define audit_remove_mark_rule(k)
 320 #define audit_mark_compare(m, i, d) 0
 321 #define audit_exe_compare(t, m) (-EINVAL)
 322 #define audit_dupe_exe(n, o) (-EINVAL)
 323
 324 #define audit_remove_tree_rule(rule) BUG()
 325 #define audit_add_tree_rule(rule) -EINVAL
 326 #define audit_make_tree(rule, str, op) -EINVAL
 327 #define audit_trim_trees() (void)0
 328 #define audit_put_tree(tree) (void)0
 329 #define audit_tag_tree(old, new) -EINVAL
 330 #define audit_tree_path(rule) ""        /* never called */
 331 #define audit_kill_trees(context) BUG()
 332
 333 #define audit_signal_info(s, t) AUDIT_DISABLED
 334 #define audit_filter_inodes(t, c) AUDIT_DISABLED
 335 #endif /* CONFIG_AUDITSYSCALL */
 336
 337 extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
 338
 339 extern pid_t audit_sig_pid;
 340 extern kuid_t audit_sig_uid;
 341 extern u32 audit_sig_sid;
 342
 343 extern int audit_filter(int msgtype, unsigned int listtype);
 344
 345 extern void audit_ctl_lock(void);
 346 extern void audit_ctl_unlock(void);