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