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#include <linux/tty.h>
  27
  28/* AUDIT_NAMES is the number of slots we reserve in the audit_context
  29 * for saving names from getname().  If we get more names we will allocate
  30 * a name dynamically and also add those to the list anchored by names_list. */
  31#define AUDIT_NAMES     5
  32
  33/* At task start time, the audit_state is set in the audit_context using
  34   a per-task filter.  At syscall entry, the audit_state is augmented by
  35   the syscall filter. */
  36enum audit_state {
  37        AUDIT_DISABLED,         /* Do not create per-task audit_context.
  38                                 * No syscall-specific audit records can
  39                                 * be generated. */
  40        AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
  41                                 * and fill it in at syscall
  42                                 * entry time.  This makes a full
  43                                 * syscall record available if some
  44                                 * other part of the kernel decides it
  45                                 * should be recorded. */
  46        AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
  47                                 * always fill it in at syscall entry
  48                                 * time, and always write out the audit
  49                                 * record at syscall exit time.  */
  50};
  51
  52/* Rule lists */
  53struct audit_watch;
  54struct audit_fsnotify_mark;
  55struct audit_tree;
  56struct audit_chunk;
  57
  58struct audit_entry {
  59        struct list_head        list;
  60        struct rcu_head         rcu;
  61        struct audit_krule      rule;
  62};
  63
  64struct audit_cap_data {
  65        kernel_cap_t            permitted;
  66        kernel_cap_t            inheritable;
  67        union {
  68                unsigned int    fE;             /* effective bit of file cap */
  69                kernel_cap_t    effective;      /* effective set of process */
  70        };
  71        kernel_cap_t            ambient;
  72};
  73
  74/* When fs/namei.c:getname() is called, we store the pointer in name and bump
  75 * the refcnt in the associated filename struct.
  76 *
  77 * Further, in fs/namei.c:path_lookup() we store the inode and device.
  78 */
  79struct audit_names {
  80        struct list_head        list;           /* audit_context->names_list */
  81
  82        struct filename         *name;
  83        int                     name_len;       /* number of chars to log */
  84        bool                    hidden;         /* don't log this record */
  85
  86        unsigned long           ino;
  87        dev_t                   dev;
  88        umode_t                 mode;
  89        kuid_t                  uid;
  90        kgid_t                  gid;
  91        dev_t                   rdev;
  92        u32                     osid;
  93        struct audit_cap_data   fcap;
  94        unsigned int            fcap_ver;
  95        unsigned char           type;           /* record type */
  96        /*
  97         * This was an allocated audit_names and not from the array of
  98         * names allocated in the task audit context.  Thus this name
  99         * should be freed on syscall exit.
 100         */
 101        bool                    should_free;
 102};
 103
 104struct audit_proctitle {
 105        int     len;    /* length of the cmdline field. */
 106        char    *value; /* the cmdline field */
 107};
 108
 109/* The per-task audit context. */
 110struct 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 timespec64   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 timespec64       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                struct {
 201                        int                     argc;
 202                } execve;
 203                struct {
 204                        char                    *name;
 205                } module;
 206        };
 207        int fds[2];
 208        struct audit_proctitle proctitle;
 209};
 210
 211extern bool audit_ever_enabled;
 212
 213extern void audit_copy_inode(struct audit_names *name,
 214                             const struct dentry *dentry,
 215                             struct inode *inode);
 216extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
 217                          kernel_cap_t *cap);
 218extern void audit_log_name(struct audit_context *context,
 219                           struct audit_names *n, const struct path *path,
 220                           int record_num, int *call_panic);
 221
 222extern int auditd_test_task(struct task_struct *task);
 223
 224#define AUDIT_INODE_BUCKETS     32
 225extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
 226
 227static inline int audit_hash_ino(u32 ino)
 228{
 229        return (ino & (AUDIT_INODE_BUCKETS-1));
 230}
 231
 232/* Indicates that audit should log the full pathname. */
 233#define AUDIT_NAME_FULL -1
 234
 235extern int audit_match_class(int class, unsigned syscall);
 236extern int audit_comparator(const u32 left, const u32 op, const u32 right);
 237extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
 238extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
 239extern int parent_len(const char *path);
 240extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
 241extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
 242                                        const void *payload, int size);
 243extern void                 audit_panic(const char *message);
 244
 245struct audit_netlink_list {
 246        __u32 portid;
 247        struct net *net;
 248        struct sk_buff_head q;
 249};
 250
 251int audit_send_list(void *_dest);
 252
 253extern int selinux_audit_rule_update(void);
 254
 255extern struct mutex audit_filter_mutex;
 256extern int audit_del_rule(struct audit_entry *entry);
 257extern void audit_free_rule_rcu(struct rcu_head *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
 265extern struct tty_struct *audit_get_tty(struct task_struct *tsk);
 266extern void audit_put_tty(struct tty_struct *tty);
 267
 268/* audit watch functions */
 269#ifdef CONFIG_AUDIT_WATCH
 270extern void audit_put_watch(struct audit_watch *watch);
 271extern void audit_get_watch(struct audit_watch *watch);
 272extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
 273extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
 274extern void audit_remove_watch_rule(struct audit_krule *krule);
 275extern char *audit_watch_path(struct audit_watch *watch);
 276extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
 277
 278extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pathname, int len);
 279extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
 280extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
 281extern void audit_remove_mark_rule(struct audit_krule *krule);
 282extern int audit_mark_compare(struct audit_fsnotify_mark *mark, unsigned long ino, dev_t dev);
 283extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
 284extern int audit_exe_compare(struct task_struct *tsk, struct audit_fsnotify_mark *mark);
 285
 286#else
 287#define audit_put_watch(w) {}
 288#define audit_get_watch(w) {}
 289#define audit_to_watch(k, p, l, o) (-EINVAL)
 290#define audit_add_watch(k, l) (-EINVAL)
 291#define audit_remove_watch_rule(k) BUG()
 292#define audit_watch_path(w) ""
 293#define audit_watch_compare(w, i, d) 0
 294
 295#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
 296#define audit_mark_path(m) ""
 297#define audit_remove_mark(m)
 298#define audit_remove_mark_rule(k)
 299#define audit_mark_compare(m, i, d) 0
 300#define audit_exe_compare(t, m) (-EINVAL)
 301#define audit_dupe_exe(n, o) (-EINVAL)
 302#endif /* CONFIG_AUDIT_WATCH */
 303
 304#ifdef CONFIG_AUDIT_TREE
 305extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
 306extern void audit_put_chunk(struct audit_chunk *chunk);
 307extern bool audit_tree_match(struct audit_chunk *chunk, struct audit_tree *tree);
 308extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
 309extern int audit_add_tree_rule(struct audit_krule *rule);
 310extern int audit_remove_tree_rule(struct audit_krule *rule);
 311extern void audit_trim_trees(void);
 312extern int audit_tag_tree(char *old, char *new);
 313extern const char *audit_tree_path(struct audit_tree *tree);
 314extern void audit_put_tree(struct audit_tree *tree);
 315extern void audit_kill_trees(struct list_head *list);
 316#else
 317#define audit_remove_tree_rule(rule) BUG()
 318#define audit_add_tree_rule(rule) -EINVAL
 319#define audit_make_tree(rule, str, op) -EINVAL
 320#define audit_trim_trees() (void)0
 321#define audit_put_tree(tree) (void)0
 322#define audit_tag_tree(old, new) -EINVAL
 323#define audit_tree_path(rule) ""        /* never called */
 324#define audit_kill_trees(list) BUG()
 325#endif
 326
 327extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
 328
 329extern pid_t audit_sig_pid;
 330extern kuid_t audit_sig_uid;
 331extern u32 audit_sig_sid;
 332
 333extern int audit_filter(int msgtype, unsigned int listtype);
 334
 335#ifdef CONFIG_AUDITSYSCALL
 336extern int audit_signal_info(int sig, struct task_struct *t);
 337extern void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx);
 338extern struct list_head *audit_killed_trees(void);
 339#else
 340#define audit_signal_info(s,t) AUDIT_DISABLED
 341#define audit_filter_inodes(t,c) AUDIT_DISABLED
 342#endif
 343
 344extern struct mutex audit_cmd_mutex;
 345