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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2010-05-10 17:30:26 +0900
committerJames Morris <jmorris@namei.org>2010-05-17 09:25:57 +1000
commit7762fbfffdbce8191f5236d5053b290035d3d749 (patch)
tree08b6de0c09c5571d3bdb61c429e1ec68e748f796 /security/tomoyo/path_group.c
parentba0c1709f4946a5ca1a678f4318ed72c0d409b3c (diff)
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TOMOYO: Add pathname grouping support.
This patch adds pathname grouping support, which is useful for grouping pathnames that cannot be represented using /\{dir\}/ pattern. Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/tomoyo/path_group.c')
-rw-r--r--security/tomoyo/path_group.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/security/tomoyo/path_group.c b/security/tomoyo/path_group.c
new file mode 100644
index 00000000000..c988041c8e1
--- /dev/null
+++ b/security/tomoyo/path_group.c
@@ -0,0 +1,172 @@
+/*
+ * security/tomoyo/path_group.c
+ *
+ * Copyright (C) 2005-2009 NTT DATA CORPORATION
+ */
+
+#include <linux/slab.h>
+#include "common.h"
+/* The list for "struct ccs_path_group". */
+LIST_HEAD(tomoyo_path_group_list);
+
+/**
+ * tomoyo_get_path_group - Allocate memory for "struct tomoyo_path_group".
+ *
+ * @group_name: The name of pathname group.
+ *
+ * Returns pointer to "struct tomoyo_path_group" on success, NULL otherwise.
+ */
+struct tomoyo_path_group *tomoyo_get_path_group(const char *group_name)
+{
+ struct tomoyo_path_group *entry = NULL;
+ struct tomoyo_path_group *group = NULL;
+ const struct tomoyo_path_info *saved_group_name;
+ int error = -ENOMEM;
+ if (!tomoyo_is_correct_path(group_name, 0, 0, 0) ||
+ !group_name[0])
+ return NULL;
+ saved_group_name = tomoyo_get_name(group_name);
+ if (!saved_group_name)
+ return NULL;
+ entry = kzalloc(sizeof(*entry), GFP_NOFS);
+ if (mutex_lock_interruptible(&tomoyo_policy_lock))
+ goto out;
+ list_for_each_entry_rcu(group, &tomoyo_path_group_list, list) {
+ if (saved_group_name != group->group_name)
+ continue;
+ atomic_inc(&group->users);
+ error = 0;
+ break;
+ }
+ if (error && tomoyo_memory_ok(entry)) {
+ INIT_LIST_HEAD(&entry->member_list);
+ entry->group_name = saved_group_name;
+ saved_group_name = NULL;
+ atomic_set(&entry->users, 1);
+ list_add_tail_rcu(&entry->list, &tomoyo_path_group_list);
+ group = entry;
+ entry = NULL;
+ error = 0;
+ }
+ mutex_unlock(&tomoyo_policy_lock);
+ out:
+ tomoyo_put_name(saved_group_name);
+ kfree(entry);
+ return !error ? group : NULL;
+}
+
+/**
+ * tomoyo_write_path_group_policy - Write "struct tomoyo_path_group" list.
+ *
+ * @data: String to parse.
+ * @is_delete: True if it is a delete request.
+ *
+ * Returns 0 on success, nagative value otherwise.
+ */
+int tomoyo_write_path_group_policy(char *data, const bool is_delete)
+{
+ struct tomoyo_path_group *group;
+ struct tomoyo_path_group_member *member;
+ struct tomoyo_path_group_member e = { };
+ int error = is_delete ? -ENOENT : -ENOMEM;
+ char *w[2];
+ if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
+ return -EINVAL;
+ group = tomoyo_get_path_group(w[0]);
+ if (!group)
+ return -ENOMEM;
+ e.member_name = tomoyo_get_name(w[1]);
+ if (!e.member_name)
+ goto out;
+ if (mutex_lock_interruptible(&tomoyo_policy_lock))
+ goto out;
+ list_for_each_entry_rcu(member, &group->member_list, list) {
+ if (member->member_name != e.member_name)
+ continue;
+ member->is_deleted = is_delete;
+ error = 0;
+ break;
+ }
+ if (!is_delete && error) {
+ struct tomoyo_path_group_member *entry =
+ tomoyo_commit_ok(&e, sizeof(e));
+ if (entry) {
+ list_add_tail_rcu(&entry->list, &group->member_list);
+ error = 0;
+ }
+ }
+ mutex_unlock(&tomoyo_policy_lock);
+ out:
+ tomoyo_put_name(e.member_name);
+ tomoyo_put_path_group(group);
+ return error;
+}
+
+/**
+ * tomoyo_read_path_group_policy - Read "struct tomoyo_path_group" list.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns true on success, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_read_path_group_policy(struct tomoyo_io_buffer *head)
+{
+ struct list_head *gpos;
+ struct list_head *mpos;
+ list_for_each_cookie(gpos, head->read_var1, &tomoyo_path_group_list) {
+ struct tomoyo_path_group *group;
+ group = list_entry(gpos, struct tomoyo_path_group, list);
+ list_for_each_cookie(mpos, head->read_var2,
+ &group->member_list) {
+ struct tomoyo_path_group_member *member;
+ member = list_entry(mpos,
+ struct tomoyo_path_group_member,
+ list);
+ if (member->is_deleted)
+ continue;
+ if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_PATH_GROUP
+ "%s %s\n",
+ group->group_name->name,
+ member->member_name->name))
+ return false;
+ }
+ }
+ return true;
+}
+
+/**
+ * tomoyo_path_matches_group - Check whether the given pathname matches members of the given pathname group.
+ *
+ * @pathname: The name of pathname.
+ * @group: Pointer to "struct tomoyo_path_group".
+ * @may_use_pattern: True if wild card is permitted.
+ *
+ * Returns true if @pathname matches pathnames in @group, false otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+bool tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
+ const struct tomoyo_path_group *group,
+ const bool may_use_pattern)
+{
+ struct tomoyo_path_group_member *member;
+ bool matched = false;
+ list_for_each_entry_rcu(member, &group->member_list, list) {
+ if (member->is_deleted)
+ continue;
+ if (!member->member_name->is_patterned) {
+ if (tomoyo_pathcmp(pathname, member->member_name))
+ continue;
+ } else if (may_use_pattern) {
+ if (!tomoyo_path_matches_pattern(pathname,
+ member->member_name))
+ continue;
+ } else
+ continue;
+ matched = true;
+ break;
+ }
+ return matched;
+}