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kernel/audit_watch.c
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/* audit_watch.c -- watching inodes * * Copyright 2003-2009 Red Hat, Inc. * Copyright 2005 Hewlett-Packard Development Company, L.P. * Copyright 2005 IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/kernel.h> #include <linux/audit.h> #include <linux/kthread.h> #include <linux/mutex.h> #include <linux/fs.h> |
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#include <linux/fsnotify_backend.h> |
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#include <linux/namei.h> #include <linux/netlink.h> #include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/security.h> #include "audit.h" /* * Reference counting: * |
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* audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED |
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* event. Each audit_watch holds a reference to its associated parent. * * audit_watch: if added to lists, lifetime is from audit_init_watch() to * audit_remove_watch(). Additionally, an audit_watch may exist * temporarily to assist in searching existing filter data. Each * audit_krule holds a reference to its associated watch. */ struct audit_watch { atomic_t count; /* reference count */ |
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dev_t dev; /* associated superblock device */ |
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char *path; /* insertion path */ |
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unsigned long ino; /* associated inode number */ struct audit_parent *parent; /* associated parent */ struct list_head wlist; /* entry in parent->watches list */ |
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struct list_head rules; /* anchor for krule->rlist */ |
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}; struct audit_parent { |
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struct list_head watches; /* anchor for audit_watch->wlist */ |
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struct fsnotify_mark mark; /* fsnotify mark on the inode */ |
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}; |
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/* fsnotify handle. */ |
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static struct fsnotify_group *audit_watch_group; |
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/* fsnotify events we care about. */ #define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\ FS_MOVE_SELF | FS_EVENT_ON_CHILD) |
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static void audit_free_parent(struct audit_parent *parent) { WARN_ON(!list_empty(&parent->watches)); kfree(parent); } |
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static void audit_watch_free_mark(struct fsnotify_mark *entry) |
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{ struct audit_parent *parent; |
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parent = container_of(entry, struct audit_parent, mark); |
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audit_free_parent(parent); |
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} |
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static void audit_get_parent(struct audit_parent *parent) { if (likely(parent)) fsnotify_get_mark(&parent->mark); } static void audit_put_parent(struct audit_parent *parent) { if (likely(parent)) fsnotify_put_mark(&parent->mark); } /* * Find and return the audit_parent on the given inode. If found a reference * is taken on this parent. */ static inline struct audit_parent *audit_find_parent(struct inode *inode) { struct audit_parent *parent = NULL; |
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struct fsnotify_mark *entry; |
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entry = fsnotify_find_inode_mark(audit_watch_group, inode); |
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if (entry) parent = container_of(entry, struct audit_parent, mark); return parent; } |
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void audit_get_watch(struct audit_watch *watch) { atomic_inc(&watch->count); } void audit_put_watch(struct audit_watch *watch) { if (atomic_dec_and_test(&watch->count)) { WARN_ON(watch->parent); WARN_ON(!list_empty(&watch->rules)); kfree(watch->path); kfree(watch); } } |
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static void audit_remove_watch(struct audit_watch *watch) |
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{ list_del(&watch->wlist); |
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audit_put_parent(watch->parent); |
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watch->parent = NULL; audit_put_watch(watch); /* match initial get */ } char *audit_watch_path(struct audit_watch *watch) { return watch->path; } |
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int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev) |
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{ |
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return (watch->ino != (unsigned long)-1) && (watch->ino == ino) && (watch->dev == dev); |
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} /* Initialize a parent watch entry. */ |
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static struct audit_parent *audit_init_parent(struct path *path) |
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{ |
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struct inode *inode = path->dentry->d_inode; |
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struct audit_parent *parent; |
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int ret; |
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parent = kzalloc(sizeof(*parent), GFP_KERNEL); if (unlikely(!parent)) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&parent->watches); |
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fsnotify_init_mark(&parent->mark, audit_watch_free_mark); parent->mark.mask = AUDIT_FS_WATCH; |
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ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0); |
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if (ret < 0) { |
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audit_free_parent(parent); |
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return ERR_PTR(ret); |
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} return parent; } /* Initialize a watch entry. */ static struct audit_watch *audit_init_watch(char *path) { struct audit_watch *watch; watch = kzalloc(sizeof(*watch), GFP_KERNEL); if (unlikely(!watch)) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&watch->rules); atomic_set(&watch->count, 1); watch->path = path; watch->dev = (dev_t)-1; watch->ino = (unsigned long)-1; return watch; } /* Translate a watch string to kernel respresentation. */ int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op) { struct audit_watch *watch; |
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if (!audit_watch_group) |
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return -EOPNOTSUPP; if (path[0] != '/' || path[len-1] == '/' || krule->listnr != AUDIT_FILTER_EXIT || op != Audit_equal || krule->inode_f || krule->watch || krule->tree) return -EINVAL; watch = audit_init_watch(path); if (IS_ERR(watch)) return PTR_ERR(watch); audit_get_watch(watch); krule->watch = watch; return 0; } /* Duplicate the given audit watch. The new watch's rules list is initialized * to an empty list and wlist is undefined. */ static struct audit_watch *audit_dupe_watch(struct audit_watch *old) { char *path; struct audit_watch *new; path = kstrdup(old->path, GFP_KERNEL); if (unlikely(!path)) return ERR_PTR(-ENOMEM); new = audit_init_watch(path); if (IS_ERR(new)) { kfree(path); goto out; } new->dev = old->dev; new->ino = old->ino; |
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audit_get_parent(old->parent); |
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new->parent = old->parent; out: return new; } static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op) { if (audit_enabled) { struct audit_buffer *ab; ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE); audit_log_format(ab, "auid=%u ses=%u op=", audit_get_loginuid(current), audit_get_sessionid(current)); audit_log_string(ab, op); audit_log_format(ab, " path="); audit_log_untrustedstring(ab, w->path); |
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audit_log_key(ab, r->filterkey); |
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audit_log_format(ab, " list=%d res=1", r->listnr); audit_log_end(ab); } } /* Update inode info in audit rules based on filesystem event. */ static void audit_update_watch(struct audit_parent *parent, const char *dname, dev_t dev, unsigned long ino, unsigned invalidating) { struct audit_watch *owatch, *nwatch, *nextw; struct audit_krule *r, *nextr; struct audit_entry *oentry, *nentry; mutex_lock(&audit_filter_mutex); |
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/* Run all of the watches on this parent looking for the one that * matches the given dname */ |
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list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) { if (audit_compare_dname_path(dname, owatch->path, NULL)) continue; /* If the update involves invalidating rules, do the inode-based * filtering now, so we don't omit records. */ |
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if (invalidating && !audit_dummy_context()) |
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audit_filter_inodes(current, current->audit_context); |
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/* updating ino will likely change which audit_hash_list we * are on so we need a new watch for the new list */ |
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nwatch = audit_dupe_watch(owatch); if (IS_ERR(nwatch)) { mutex_unlock(&audit_filter_mutex); audit_panic("error updating watch, skipping"); return; } nwatch->dev = dev; nwatch->ino = ino; list_for_each_entry_safe(r, nextr, &owatch->rules, rlist) { oentry = container_of(r, struct audit_entry, rule); list_del(&oentry->rule.rlist); list_del_rcu(&oentry->list); |
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nentry = audit_dupe_rule(&oentry->rule); |
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if (IS_ERR(nentry)) { list_del(&oentry->rule.list); audit_panic("error updating watch, removing"); } else { int h = audit_hash_ino((u32)ino); |
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/* * nentry->rule.watch == oentry->rule.watch so * we must drop that reference and set it to our * new watch. */ audit_put_watch(nentry->rule.watch); audit_get_watch(nwatch); nentry->rule.watch = nwatch; |
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list_add(&nentry->rule.rlist, &nwatch->rules); list_add_rcu(&nentry->list, &audit_inode_hash[h]); list_replace(&oentry->rule.list, &nentry->rule.list); } audit_watch_log_rule_change(r, owatch, "updated rules"); call_rcu(&oentry->rcu, audit_free_rule_rcu); } audit_remove_watch(owatch); goto add_watch_to_parent; /* event applies to a single watch */ } mutex_unlock(&audit_filter_mutex); return; add_watch_to_parent: list_add(&nwatch->wlist, &parent->watches); mutex_unlock(&audit_filter_mutex); return; } /* Remove all watches & rules associated with a parent that is going away. */ static void audit_remove_parent_watches(struct audit_parent *parent) { struct audit_watch *w, *nextw; struct audit_krule *r, *nextr; struct audit_entry *e; mutex_lock(&audit_filter_mutex); |
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list_for_each_entry_safe(w, nextw, &parent->watches, wlist) { list_for_each_entry_safe(r, nextr, &w->rules, rlist) { e = container_of(r, struct audit_entry, rule); audit_watch_log_rule_change(r, w, "remove rule"); list_del(&r->rlist); list_del(&r->list); list_del_rcu(&e->list); call_rcu(&e->rcu, audit_free_rule_rcu); } audit_remove_watch(w); } mutex_unlock(&audit_filter_mutex); |
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fsnotify_destroy_mark(&parent->mark); |
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} |
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/* Get path information necessary for adding watches. */ |
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static int audit_get_nd(struct audit_watch *watch, struct path *parent) |
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{ |
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struct nameidata nd; struct dentry *d; |
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int err; |
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err = kern_path_parent(watch->path, &nd); |
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if (err) return err; |
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if (nd.last_type != LAST_NORM) { path_put(&nd.path); return -EINVAL; |
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} |
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mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); d = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len); if (IS_ERR(d)) { mutex_unlock(&nd.path.dentry->d_inode->i_mutex); path_put(&nd.path); return PTR_ERR(d); |
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} |
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if (d->d_inode) { /* update watch filter fields */ watch->dev = d->d_inode->i_sb->s_dev; watch->ino = d->d_inode->i_ino; |
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} |
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mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
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*parent = nd.path; dput(d); |
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return 0; } |
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/* Associate the given rule with an existing parent. |
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* Caller must hold audit_filter_mutex. */ static void audit_add_to_parent(struct audit_krule *krule, struct audit_parent *parent) { struct audit_watch *w, *watch = krule->watch; int watch_found = 0; |
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BUG_ON(!mutex_is_locked(&audit_filter_mutex)); |
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list_for_each_entry(w, &parent->watches, wlist) { if (strcmp(watch->path, w->path)) continue; watch_found = 1; /* put krule's and initial refs to temporary watch */ audit_put_watch(watch); audit_put_watch(watch); audit_get_watch(w); krule->watch = watch = w; break; } if (!watch_found) { |
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audit_get_parent(parent); |
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watch->parent = parent; list_add(&watch->wlist, &parent->watches); } list_add(&krule->rlist, &watch->rules); } /* Find a matching watch entry, or add this one. * Caller must hold audit_filter_mutex. */ |
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int audit_add_watch(struct audit_krule *krule, struct list_head **list) |
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{ struct audit_watch *watch = krule->watch; |
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struct audit_parent *parent; |
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struct path parent_path; |
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int h, ret = 0; |
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mutex_unlock(&audit_filter_mutex); /* Avoid calling path_lookup under audit_filter_mutex. */ |
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ret = audit_get_nd(watch, &parent_path); |
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/* caller expects mutex locked */ |
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mutex_lock(&audit_filter_mutex); |
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if (ret) return ret; |
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/* either find an old parent or attach a new one */ |
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parent = audit_find_parent(parent_path.dentry->d_inode); |
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if (!parent) { |
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parent = audit_init_parent(&parent_path); |
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if (IS_ERR(parent)) { |
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ret = PTR_ERR(parent); goto error; |
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} |
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} |
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audit_add_to_parent(krule, parent); |
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/* match get in audit_find_parent or audit_init_parent */ audit_put_parent(parent); |
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h = audit_hash_ino((u32)watch->ino); *list = &audit_inode_hash[h]; |
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error: |
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path_put(&parent_path); |
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return ret; } |
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void audit_remove_watch_rule(struct audit_krule *krule) |
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{ struct audit_watch *watch = krule->watch; struct audit_parent *parent = watch->parent; list_del(&krule->rlist); if (list_empty(&watch->rules)) { audit_remove_watch(watch); if (list_empty(&parent->watches)) { |
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audit_get_parent(parent); |
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fsnotify_destroy_mark(&parent->mark); |
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audit_put_parent(parent); |
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} } } |
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static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode, |
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struct fsnotify_mark *inode_mark, |
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struct fsnotify_mark *vfsmount_mark, |
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__u32 mask, void *data, int data_type) |
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{ |
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return true; |
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} /* Update watch data in audit rules based on fsnotify events. */ |
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static int audit_watch_handle_event(struct fsnotify_group *group, |
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struct fsnotify_mark *inode_mark, struct fsnotify_mark *vfsmount_mark, |
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struct fsnotify_event *event) |
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{ struct inode *inode; __u32 mask = event->mask; const char *dname = event->file_name; |
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struct audit_parent *parent; |
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parent = container_of(inode_mark, struct audit_parent, mark); |
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BUG_ON(group != audit_watch_group); |
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switch (event->data_type) { |
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case (FSNOTIFY_EVENT_PATH): inode = event->path.dentry->d_inode; |
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break; case (FSNOTIFY_EVENT_INODE): inode = event->inode; break; default: BUG(); inode = NULL; break; }; |
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if (mask & (FS_CREATE|FS_MOVED_TO) && inode) |
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audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0); |
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else if (mask & (FS_DELETE|FS_MOVED_FROM)) |
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audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1); |
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else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF)) |
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audit_remove_parent_watches(parent); |
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return 0; } |
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static const struct fsnotify_ops audit_watch_fsnotify_ops = { .should_send_event = audit_watch_should_send_event, .handle_event = audit_watch_handle_event, .free_group_priv = NULL, |
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.freeing_mark = NULL, |
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.free_event_priv = NULL, |
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}; static int __init audit_watch_init(void) { |
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audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops); |
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if (IS_ERR(audit_watch_group)) { audit_watch_group = NULL; audit_panic("cannot create audit fsnotify group"); } |
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return 0; } |
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device_initcall(audit_watch_init); |