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 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
  28  * for saving names from getname().  If we get more names we will allocate
  29  * a name dynamically and also add those to the list anchored by names_list. */
  30 #define AUDIT_NAMES     5
  31
  32 /* At task start time, the audit_state is set in the audit_context using
  33    a per-task filter.  At syscall entry, the audit_state is augmented by
  34    the syscall filter. */
  35 enum audit_state {
  36         AUDIT_DISABLED,         /* Do not create per-task audit_context.
  37                                  * No syscall-specific audit records can
  38                                  * be generated. */
  39         AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
  40                                  * and fill it in at syscall
  41                                  * entry time.  This makes a full
  42                                  * syscall record available if some
  43                                  * other part of the kernel decides it
  44                                  * should be recorded. */
  45         AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
  46                                  * always fill it in at syscall entry
  47                                  * time, and always write out the audit
  48                                  * record at syscall exit time.  */
  49 };
  50
  51 /* Rule lists */
  52 struct audit_watch;
  53 struct audit_tree;
  54 struct audit_chunk;
  55
  56 struct audit_entry {
  57         struct list_head        list;
  58         struct rcu_head         rcu;
  59         struct audit_krule      rule;
  60 };
  61
  62 struct audit_cap_data {
  63         kernel_cap_t            permitted;
  64         kernel_cap_t            inheritable;
  65         union {
  66                 unsigned int    fE;             /* effective bit of file cap */
  67                 kernel_cap_t    effective;      /* effective set of process */
  68         };
  69 };
  70
  71 /* When fs/namei.c:getname() is called, we store the pointer in name and bump
  72  * the refcnt in the associated filename struct.
  73  *
  74  * Further, in fs/namei.c:path_lookup() we store the inode and device.
  75  */
  76 struct audit_names {
  77         struct list_head        list;           /* audit_context->names_list */
  78
  79         struct filename         *name;
  80         int                     name_len;       /* number of chars to log */
  81         bool                    hidden;         /* don't log this record */
  82
  83         unsigned long           ino;
  84         dev_t                   dev;
  85         umode_t                 mode;
  86         kuid_t                  uid;
  87         kgid_t                  gid;
  88         dev_t                   rdev;
  89         u32                     osid;
  90         struct audit_cap_data   fcap;
  91         unsigned int            fcap_ver;
  92         unsigned char           type;           /* record type */
  93         /*
  94          * This was an allocated audit_names and not from the array of
  95          * names allocated in the task audit context.  Thus this name
  96          * should be freed on syscall exit.
  97          */
  98         bool                    should_free;
  99 };
 100
 101 struct audit_proctitle {
 102         int     len;    /* length of the cmdline field. */
 103         char    *value; /* the cmdline field */
 104 };
 105
 106 /* The per-task audit context. */
 107 struct audit_context {
 108         int                 dummy;      /* must be the first element */
 109         int                 in_syscall; /* 1 if task is in a syscall */
 110         enum audit_state    state, current_state;
 111         unsigned int        serial;     /* serial number for record */
 112         int                 major;      /* syscall number */
 113         struct timespec     ctime;      /* time of syscall entry */
 114         unsigned long       argv[4];    /* syscall arguments */
 115         long                return_code;/* syscall return code */
 116         u64                 prio;
 117         int                 return_valid; /* return code is valid */
 118         /*
 119          * The names_list is the list of all audit_names collected during this
 120          * syscall.  The first AUDIT_NAMES entries in the names_list will
 121          * actually be from the preallocated_names array for performance
 122          * reasons.  Except during allocation they should never be referenced
 123          * through the preallocated_names array and should only be found/used
 124          * by running the names_list.
 125          */
 126         struct audit_names  preallocated_names[AUDIT_NAMES];
 127         int                 name_count; /* total records in names_list */
 128         struct list_head    names_list; /* struct audit_names->list anchor */
 129         char                *filterkey; /* key for rule that triggered record */
 130         struct path         pwd;
 131         struct audit_aux_data *aux;
 132         struct audit_aux_data *aux_pids;
 133         struct sockaddr_storage *sockaddr;
 134         size_t sockaddr_len;
 135                                 /* Save things to print about task_struct */
 136         pid_t               pid, ppid;
 137         kuid_t              uid, euid, suid, fsuid;
 138         kgid_t              gid, egid, sgid, fsgid;
 139         unsigned long       personality;
 140         int                 arch;
 141
 142         pid_t               target_pid;
 143         kuid_t              target_auid;
 144         kuid_t              target_uid;
 145         unsigned int        target_sessionid;
 146         u32                 target_sid;
 147         char                target_comm[TASK_COMM_LEN];
 148
 149         struct audit_tree_refs *trees, *first_trees;
 150         struct list_head killed_trees;
 151         int tree_count;
 152
 153         int type;
 154         union {
 155                 struct {
 156                         int nargs;
 157                         long args[6];
 158                 } socketcall;
 159                 struct {
 160                         kuid_t                  uid;
 161                         kgid_t                  gid;
 162                         umode_t                 mode;
 163                         u32                     osid;
 164                         int                     has_perm;
 165                         uid_t                   perm_uid;
 166                         gid_t                   perm_gid;
 167                         umode_t                 perm_mode;
 168                         unsigned long           qbytes;
 169                 } ipc;
 170                 struct {
 171                         mqd_t                   mqdes;
 172                         struct mq_attr          mqstat;
 173                 } mq_getsetattr;
 174                 struct {
 175                         mqd_t                   mqdes;
 176                         int                     sigev_signo;
 177                 } mq_notify;
 178                 struct {
 179                         mqd_t                   mqdes;
 180                         size_t                  msg_len;
 181                         unsigned int            msg_prio;
 182                         struct timespec         abs_timeout;
 183                 } mq_sendrecv;
 184                 struct {
 185                         int                     oflag;
 186                         umode_t                 mode;
 187                         struct mq_attr          attr;
 188                 } mq_open;
 189                 struct {
 190                         pid_t                   pid;
 191                         struct audit_cap_data   cap;
 192                 } capset;
 193                 struct {
 194                         int                     fd;
 195                         int                     flags;
 196                 } mmap;
 197                 struct {
 198                         int                     argc;
 199                 } execve;
 200         };
 201         int fds[2];
 202         struct audit_proctitle proctitle;
 203 };
 204
 205 extern u32 audit_ever_enabled;
 206
 207 extern void audit_copy_inode(struct audit_names *name,
 208                              const struct dentry *dentry,
 209                              const struct inode *inode);
 210 extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
 211                           kernel_cap_t *cap);
 212 extern void audit_log_name(struct audit_context *context,
 213                            struct audit_names *n, struct path *path,
 214                            int record_num, int *call_panic);
 215
 216 extern int audit_pid;
 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(__u32 portid, int seq, int type,
 236                                         int done, int multi,
 237                                         const void *payload, int size);
 238 extern void                 audit_panic(const char *message);
 239
 240 struct audit_netlink_list {
 241         __u32 portid;
 242         struct net *net;
 243         struct sk_buff_head q;
 244 };
 245
 246 int audit_send_list(void *);
 247
 248 struct audit_net {
 249         struct sock *nlsk;
 250 };
 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 extern void audit_log_d_path_exe(struct audit_buffer *ab,
 261                                  struct mm_struct *mm);
 262
 263 /* audit watch functions */
 264 #ifdef CONFIG_AUDIT_WATCH
 265 extern void audit_put_watch(struct audit_watch *watch);
 266 extern void audit_get_watch(struct audit_watch *watch);
 267 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
 268 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
 269 extern void audit_remove_watch_rule(struct audit_krule *krule);
 270 extern char *audit_watch_path(struct audit_watch *watch);
 271 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
 272 #else
 273 #define audit_put_watch(w) {}
 274 #define audit_get_watch(w) {}
 275 #define audit_to_watch(k, p, l, o) (-EINVAL)
 276 #define audit_add_watch(k, l) (-EINVAL)
 277 #define audit_remove_watch_rule(k) BUG()
 278 #define audit_watch_path(w) ""
 279 #define audit_watch_compare(w, i, d) 0
 280
 281 #endif /* CONFIG_AUDIT_WATCH */
 282
 283 #ifdef CONFIG_AUDIT_TREE
 284 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 285 extern void audit_put_chunk(struct audit_chunk *);
 286 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
 287 extern int audit_make_tree(struct audit_krule *, char *, u32);
 288 extern int audit_add_tree_rule(struct audit_krule *);
 289 extern int audit_remove_tree_rule(struct audit_krule *);
 290 extern void audit_trim_trees(void);
 291 extern int audit_tag_tree(char *old, char *new);
 292 extern const char *audit_tree_path(struct audit_tree *);
 293 extern void audit_put_tree(struct audit_tree *);
 294 extern void audit_kill_trees(struct list_head *);
 295 #else
 296 #define audit_remove_tree_rule(rule) BUG()
 297 #define audit_add_tree_rule(rule) -EINVAL
 298 #define audit_make_tree(rule, str, op) -EINVAL
 299 #define audit_trim_trees() (void)0
 300 #define audit_put_tree(tree) (void)0
 301 #define audit_tag_tree(old, new) -EINVAL
 302 #define audit_tree_path(rule) ""        /* never called */
 303 #define audit_kill_trees(list) BUG()
 304 #endif
 305
 306 extern char *audit_unpack_string(void **, size_t *, size_t);
 307
 308 extern pid_t audit_sig_pid;
 309 extern kuid_t audit_sig_uid;
 310 extern u32 audit_sig_sid;
 311
 312 #ifdef CONFIG_AUDITSYSCALL
 313 extern int __audit_signal_info(int sig, struct task_struct *t);
 314 static inline int audit_signal_info(int sig, struct task_struct *t)
 315 {
 316         if (unlikely((audit_pid && t->tgid == audit_pid) ||
 317                      (audit_signals && !audit_dummy_context())))
 318                 return __audit_signal_info(sig, t);
 319         return 0;
 320 }
 321 extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
 322 extern struct list_head *audit_killed_trees(void);
 323 #else
 324 #define audit_signal_info(s,t) AUDIT_DISABLED
 325 #define audit_filter_inodes(t,c) AUDIT_DISABLED
 326 #endif
 327
 328 extern struct mutex audit_cmd_mutex;