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![Al Viro](/assets/img/avatar_default.png)
New kind of audit rule predicates: "object is visible in given subtree". The part that can be sanely implemented, that is. Limitations: * if you have hardlink from outside of tree, you'd better watch it too (or just watch the object itself, obviously) * if you mount something under a watched tree, tell audit that new chunk should be added to watched subtrees * if you umount something in a watched tree and it's still mounted elsewhere, you will get matches on events happening there. New command tells audit to recalculate the trees, trimming such sources of false positives. Note that it's _not_ about path - if something mounted in several places (multiple mount, bindings, different namespaces, etc.), the match does _not_ depend on which one we are using for access. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
181 lines
5.9 KiB
C
181 lines
5.9 KiB
C
/* audit -- definition of audit_context structure and supporting types
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*
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* Copyright 2003-2004 Red Hat, Inc.
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* Copyright 2005 Hewlett-Packard Development Company, L.P.
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* Copyright 2005 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/audit.h>
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#include <linux/skbuff.h>
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/* 0 = no checking
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1 = put_count checking
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2 = verbose put_count checking
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*/
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#define AUDIT_DEBUG 0
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/* At task start time, the audit_state is set in the audit_context using
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a per-task filter. At syscall entry, the audit_state is augmented by
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the syscall filter. */
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enum audit_state {
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AUDIT_DISABLED, /* Do not create per-task audit_context.
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* No syscall-specific audit records can
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* be generated. */
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AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context,
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* but don't necessarily fill it in at
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* syscall entry time (i.e., filter
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* instead). */
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AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
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* and always fill it in at syscall
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* entry time. This makes a full
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* syscall record available if some
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* other part of the kernel decides it
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* should be recorded. */
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AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
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* always fill it in at syscall entry
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* time, and always write out the audit
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* record at syscall exit time. */
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};
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/* Rule lists */
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struct audit_parent;
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struct audit_watch {
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atomic_t count; /* reference count */
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char *path; /* insertion path */
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dev_t dev; /* associated superblock device */
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unsigned long ino; /* associated inode number */
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struct audit_parent *parent; /* associated parent */
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struct list_head wlist; /* entry in parent->watches list */
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struct list_head rules; /* associated rules */
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};
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struct audit_field {
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u32 type;
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u32 val;
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u32 op;
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char *se_str;
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struct selinux_audit_rule *se_rule;
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};
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struct audit_tree;
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struct audit_chunk;
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struct audit_krule {
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int vers_ops;
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u32 flags;
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u32 listnr;
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u32 action;
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u32 mask[AUDIT_BITMASK_SIZE];
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u32 buflen; /* for data alloc on list rules */
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u32 field_count;
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char *filterkey; /* ties events to rules */
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struct audit_field *fields;
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struct audit_field *arch_f; /* quick access to arch field */
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struct audit_field *inode_f; /* quick access to an inode field */
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struct audit_watch *watch; /* associated watch */
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struct audit_tree *tree; /* associated watched tree */
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struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
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};
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struct audit_entry {
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struct list_head list;
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struct rcu_head rcu;
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struct audit_krule rule;
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};
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extern int audit_pid;
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#define AUDIT_INODE_BUCKETS 32
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extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
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static inline int audit_hash_ino(u32 ino)
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{
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return (ino & (AUDIT_INODE_BUCKETS-1));
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}
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extern int audit_match_class(int class, unsigned syscall);
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extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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extern int audit_compare_dname_path(const char *dname, const char *path,
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int *dirlen);
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extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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extern void audit_send_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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extern void audit_panic(const char *message);
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struct audit_netlink_list {
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int pid;
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struct sk_buff_head q;
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};
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int audit_send_list(void *);
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struct inotify_watch;
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extern void audit_free_parent(struct inotify_watch *);
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extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
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const char *, struct inode *);
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extern int selinux_audit_rule_update(void);
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extern struct mutex audit_filter_mutex;
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extern void audit_free_rule_rcu(struct rcu_head *);
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#ifdef CONFIG_AUDIT_TREE
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extern struct audit_chunk *audit_tree_lookup(const struct inode *);
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extern void audit_put_chunk(struct audit_chunk *);
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extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
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extern int audit_make_tree(struct audit_krule *, char *, u32);
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extern int audit_add_tree_rule(struct audit_krule *);
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extern int audit_remove_tree_rule(struct audit_krule *);
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extern void audit_trim_trees(void);
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extern int audit_tag_tree(char *old, char *new);
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extern void audit_schedule_prune(void);
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extern void audit_prune_trees(void);
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extern const char *audit_tree_path(struct audit_tree *);
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extern void audit_put_tree(struct audit_tree *);
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#else
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#define audit_remove_tree_rule(rule) BUG()
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#define audit_add_tree_rule(rule) -EINVAL
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#define audit_make_tree(rule, str, op) -EINVAL
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#define audit_trim_trees() (void)0
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#define audit_put_tree(tree) (void)0
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#define audit_tag_tree(old, new) -EINVAL
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#define audit_tree_path(rule) "" /* never called */
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#endif
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extern char *audit_unpack_string(void **, size_t *, size_t);
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#ifdef CONFIG_AUDITSYSCALL
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extern int __audit_signal_info(int sig, struct task_struct *t);
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static inline int audit_signal_info(int sig, struct task_struct *t)
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{
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if (unlikely((audit_pid && t->tgid == audit_pid) ||
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(audit_signals && !audit_dummy_context())))
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return __audit_signal_info(sig, t);
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return 0;
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}
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extern enum audit_state audit_filter_inodes(struct task_struct *,
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struct audit_context *);
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extern void audit_set_auditable(struct audit_context *);
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#else
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#define audit_signal_info(s,t) AUDIT_DISABLED
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#define audit_filter_inodes(t,c) AUDIT_DISABLED
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#define audit_set_auditable(c)
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#endif
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