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