LXR linux/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. */
  35enum 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 */
  52struct audit_watch;
  53struct audit_fsnotify_mark;
  54struct audit_tree;
  55struct audit_chunk;
  56
  57struct audit_entry {
  58        struct list_head        list;
  59        struct rcu_head         rcu;
  60        struct audit_krule      rule;
  61};
  62
  63struct audit_cap_data {
  64        kernel_cap_t            permitted;
  65        kernel_cap_t            inheritable;
  66        union {
  67                unsigned int    fE;             /* effective bit of file cap */
  68                kernel_cap_t    effective;      /* effective set of process */
  69        };
  70};
  71
  72/* When fs/namei.c:getname() is called, we store the pointer in name and bump
  73 * the refcnt in the associated filename struct.
  74 *
  75 * Further, in fs/namei.c:path_lookup() we store the inode and device.
  76 */
  77struct audit_names {
  78        struct list_head        list;           /* audit_context->names_list */
  79
  80        struct filename         *name;
  81        int                     name_len;       /* number of chars to log */
  82        bool                    hidden;         /* don't log this record */
  83
  84        unsigned long           ino;
  85        dev_t                   dev;
  86        umode_t                 mode;
  87        kuid_t                  uid;
  88        kgid_t                  gid;
  89        dev_t                   rdev;
  90        u32                     osid;
  91        struct audit_cap_data   fcap;
  92        unsigned int            fcap_ver;
  93        unsigned char           type;           /* record type */
  94        /*
  95         * This was an allocated audit_names and not from the array of
  96         * names allocated in the task audit context.  Thus this name
  97         * should be freed on syscall exit.
  98         */
  99        bool                    should_free;
 100};
 101
 102struct audit_proctitle {
 103        int     len;    /* length of the cmdline field. */
 104        char    *value; /* the cmdline field */
 105};
 106
 107/* The per-task audit context. */
 108struct audit_context {
 109        int                 dummy;      /* must be the first element */
 110        int                 in_syscall; /* 1 if task is in a syscall */
 111        enum audit_state    state, current_state;
 112        unsigned int        serial;     /* serial number for record */
 113        int                 major;      /* syscall number */
 114        struct timespec     ctime;      /* time of syscall entry */
 115        unsigned long       argv[4];    /* syscall arguments */
 116        long                return_code;/* syscall return code */
 117        u64                 prio;
 118        int                 return_valid; /* return code is valid */
 119        /*
 120         * The names_list is the list of all audit_names collected during this
 121         * syscall.  The first AUDIT_NAMES entries in the names_list will
 122         * actually be from the preallocated_names array for performance
 123         * reasons.  Except during allocation they should never be referenced
 124         * through the preallocated_names array and should only be found/used
 125         * by running the names_list.
 126         */
 127        struct audit_names  preallocated_names[AUDIT_NAMES];
 128        int                 name_count; /* total records in names_list */
 129        struct list_head    names_list; /* struct audit_names->list anchor */
 130        char                *filterkey; /* key for rule that triggered record */
 131        struct path         pwd;
 132        struct audit_aux_data *aux;
 133        struct audit_aux_data *aux_pids;
 134        struct sockaddr_storage *sockaddr;
 135        size_t sockaddr_len;
 136                                /* Save things to print about task_struct */
 137        pid_t               pid, ppid;
 138        kuid_t              uid, euid, suid, fsuid;
 139        kgid_t              gid, egid, sgid, fsgid;
 140        unsigned long       personality;
 141        int                 arch;
 142
 143        pid_t               target_pid;
 144        kuid_t              target_auid;
 145        kuid_t              target_uid;
 146        unsigned int        target_sessionid;
 147        u32                 target_sid;
 148        char                target_comm[TASK_COMM_LEN];
 149
 150        struct audit_tree_refs *trees, *first_trees;
 151        struct list_head killed_trees;
 152        int tree_count;
 153
 154        int type;
 155        union {
 156                struct {
 157                        int nargs;
 158                        long args[6];
 159                } socketcall;
 160                struct {
 161                        kuid_t                  uid;
 162                        kgid_t                  gid;
 163                        umode_t                 mode;
 164                        u32                     osid;
 165                        int                     has_perm;
 166                        uid_t                   perm_uid;
 167                        gid_t                   perm_gid;
 168                        umode_t                 perm_mode;
 169                        unsigned long           qbytes;
 170                } ipc;
 171                struct {
 172                        mqd_t                   mqdes;
 173                        struct mq_attr          mqstat;
 174                } mq_getsetattr;
 175                struct {
 176                        mqd_t                   mqdes;
 177                        int                     sigev_signo;
 178                } mq_notify;
 179                struct {
 180                        mqd_t                   mqdes;
 181                        size_t                  msg_len;
 182                        unsigned int            msg_prio;
 183                        struct timespec         abs_timeout;
 184                } mq_sendrecv;
 185                struct {
 186                        int                     oflag;
 187                        umode_t                 mode;
 188                        struct mq_attr          attr;
 189                } mq_open;
 190                struct {
 191                        pid_t                   pid;
 192                        struct audit_cap_data   cap;
 193                } capset;
 194                struct {
 195                        int                     fd;
 196                        int                     flags;
 197                } mmap;
 198                struct {
 199                        int                     argc;
 200                } execve;
 201        };
 202        int fds[2];
 203        struct audit_proctitle proctitle;
 204};
 205
 206extern u32 audit_ever_enabled;
 207
 208extern void audit_copy_inode(struct audit_names *name,
 209                             const struct dentry *dentry,
 210                             struct inode *inode);
 211extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
 212                          kernel_cap_t *cap);
 213extern void audit_log_name(struct audit_context *context,
 214                           struct audit_names *n, struct path *path,
 215                           int record_num, int *call_panic);
 216
 217extern int audit_pid;
 218
 219#define AUDIT_INODE_BUCKETS     32
 220extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 221
 222static inline int audit_hash_ino(u32 ino)
 223{
 224        return (ino & (AUDIT_INODE_BUCKETS-1));
 225}
 226
 227/* Indicates that audit should log the full pathname. */
 228#define AUDIT_NAME_FULL -1
 229
 230extern int audit_match_class(int class, unsigned syscall);
 231extern int audit_comparator(const u32 left, const u32 op, const u32 right);
 232extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
 233extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
 234extern int parent_len(const char *path);
 235extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
 236extern struct sk_buff *audit_make_reply(__u32 portid, int seq, int type,
 237                                        int done, int multi,
 238                                        const void *payload, int size);
 239extern void                 audit_panic(const char *message);
 240
 241struct audit_netlink_list {
 242        __u32 portid;
 243        struct net *net;
 244        struct sk_buff_head q;
 245};
 246
 247int audit_send_list(void *);
 248
 249struct audit_net {
 250        struct sock *nlsk;
 251};
 252
 253extern int selinux_audit_rule_update(void);
 254
 255extern struct mutex audit_filter_mutex;
 256extern int audit_del_rule(struct audit_entry *);
 257extern void audit_free_rule_rcu(struct rcu_head *);
 258extern struct list_head audit_filter_list[];
 259
 260extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
 261
 262extern void audit_log_d_path_exe(struct audit_buffer *ab,
 263                                 struct mm_struct *mm);
 264
 265/* audit watch functions */
 266#ifdef CONFIG_AUDIT_WATCH
 267extern void audit_put_watch(struct audit_watch *watch);
 268extern void audit_get_watch(struct audit_watch *watch);
 269extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
 270extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
 271extern void audit_remove_watch_rule(struct audit_krule *krule);
 272extern char *audit_watch_path(struct audit_watch *watch);
 273extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
 274
 275extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len);
 276extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
 277extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
 278extern void audit_remove_mark_rule(struct audit_krule *krule);
 279extern int audit_mark_compare(struct audit_fsnotify_mark *mark, unsigned long ino, dev_t dev);
 280extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
 281extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark);
 282
 283#else
 284#define audit_put_watch(w) {}
 285#define audit_get_watch(w) {}
 286#define audit_to_watch(k, p, l, o) (-EINVAL)
 287#define audit_add_watch(k, l) (-EINVAL)
 288#define audit_remove_watch_rule(k) BUG()
 289#define audit_watch_path(w) ""
 290#define audit_watch_compare(w, i, d) 0
 291
 292#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
 293#define audit_mark_path(m) ""
 294#define audit_remove_mark(m)
 295#define audit_remove_mark_rule(k)
 296#define audit_mark_compare(m, i, d) 0
 297#define audit_exe_compare(t, m) (-EINVAL)
 298#define audit_dupe_exe(n, o) (-EINVAL)
 299#endif /* CONFIG_AUDIT_WATCH */
 300
 301#ifdef CONFIG_AUDIT_TREE
 302extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 303extern void audit_put_chunk(struct audit_chunk *);
 304extern bool audit_tree_match(struct audit_chunk *, struct audit_tree *);
 305extern int audit_make_tree(struct audit_krule *, char *, u32);
 306extern int audit_add_tree_rule(struct audit_krule *);
 307extern int audit_remove_tree_rule(struct audit_krule *);
 308extern void audit_trim_trees(void);
 309extern int audit_tag_tree(char *old, char *new);
 310extern const char *audit_tree_path(struct audit_tree *);
 311extern void audit_put_tree(struct audit_tree *);
 312extern void audit_kill_trees(struct list_head *);
 313#else
 314#define audit_remove_tree_rule(rule) BUG()
 315#define audit_add_tree_rule(rule) -EINVAL
 316#define audit_make_tree(rule, str, op) -EINVAL
 317#define audit_trim_trees() (void)0
 318#define audit_put_tree(tree) (void)0
 319#define audit_tag_tree(old, new) -EINVAL
 320#define audit_tree_path(rule) ""        /* never called */
 321#define audit_kill_trees(list) BUG()
 322#endif
 323
 324extern char *audit_unpack_string(void **, size_t *, size_t);
 325
 326extern pid_t audit_sig_pid;
 327extern kuid_t audit_sig_uid;
 328extern u32 audit_sig_sid;
 329
 330#ifdef CONFIG_AUDITSYSCALL
 331extern int __audit_signal_info(int sig, struct task_struct *t);
 332static inline int audit_signal_info(int sig, struct task_struct *t)
 333{
 334        if (unlikely((audit_pid && t->tgid == audit_pid) ||
 335                     (audit_signals && !audit_dummy_context())))
 336                return __audit_signal_info(sig, t);
 337        return 0;
 338}
 339extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
 340extern struct list_head *audit_killed_trees(void);
 341#else
 342#define audit_signal_info(s,t) AUDIT_DISABLED
 343#define audit_filter_inodes(t,c) AUDIT_DISABLED
 344#endif
 345
 346extern struct mutex audit_cmd_mutex;
 347