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