TOMOYO: Allow domain transition without execve().
To be able to split permissions for Apache's CGI programs which are executed
without execve(), add special domain transition which is performed by writing
a TOMOYO's domainname to /sys/kernel/security/tomoyo/self_domain interface.
This is an API for TOMOYO-aware userland applications. However, since I expect
TOMOYO and other LSM modules to run in parallel, this patch does not use
/proc/self/attr/ interface in order to avoid conflicts with other LSM modules
when it became possible to run multiple LSM modules in parallel.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 2704c38..1fd0fc1 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -1011,6 +1011,48 @@
}
/**
+ * tomoyo_same_task_acl - Check for duplicated "struct tomoyo_task_acl" entry.
+ *
+ * @a: Pointer to "struct tomoyo_acl_info".
+ * @b: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if @a == @b, false otherwise.
+ */
+static bool tomoyo_same_task_acl(const struct tomoyo_acl_info *a,
+ const struct tomoyo_acl_info *b)
+{
+ const struct tomoyo_task_acl *p1 = container_of(a, typeof(*p1), head);
+ const struct tomoyo_task_acl *p2 = container_of(b, typeof(*p2), head);
+ return p1->domainname == p2->domainname;
+}
+
+/**
+ * tomoyo_write_task - Update task related list.
+ *
+ * @param: Pointer to "struct tomoyo_acl_param".
+ *
+ * Returns 0 on success, negative value otherwise.
+ *
+ * Caller holds tomoyo_read_lock().
+ */
+static int tomoyo_write_task(struct tomoyo_acl_param *param)
+{
+ int error = -EINVAL;
+ if (tomoyo_str_starts(¶m->data, "manual_domain_transition ")) {
+ struct tomoyo_task_acl e = {
+ .head.type = TOMOYO_TYPE_MANUAL_TASK_ACL,
+ .domainname = tomoyo_get_domainname(param),
+ };
+ if (e.domainname)
+ error = tomoyo_update_domain(&e.head, sizeof(e), param,
+ tomoyo_same_task_acl,
+ NULL);
+ tomoyo_put_name(e.domainname);
+ }
+ return error;
+}
+
+/**
* tomoyo_delete_domain - Delete a domain.
*
* @domainname: The name of domain.
@@ -1068,11 +1110,12 @@
static const struct {
const char *keyword;
int (*write) (struct tomoyo_acl_param *);
- } tomoyo_callback[4] = {
+ } tomoyo_callback[5] = {
{ "file ", tomoyo_write_file },
{ "network inet ", tomoyo_write_inet_network },
{ "network unix ", tomoyo_write_unix_network },
{ "misc ", tomoyo_write_misc },
+ { "task ", tomoyo_write_task },
};
u8 i;
@@ -1343,6 +1386,12 @@
if (first)
return true;
tomoyo_print_name_union(head, &ptr->name);
+ } else if (acl_type == TOMOYO_TYPE_MANUAL_TASK_ACL) {
+ struct tomoyo_task_acl *ptr =
+ container_of(acl, typeof(*ptr), head);
+ tomoyo_set_group(head, "task ");
+ tomoyo_set_string(head, "manual_domain_transition ");
+ tomoyo_set_string(head, ptr->domainname->name);
} else if (head->r.print_transition_related_only) {
return true;
} else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
@@ -2178,26 +2227,6 @@
}
}
-/**
- * tomoyo_read_self_domain - Get the current process's domainname.
- *
- * @head: Pointer to "struct tomoyo_io_buffer".
- *
- * Returns the current process's domainname.
- */
-static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
-{
- if (!head->r.eof) {
- /*
- * tomoyo_domain()->domainname != NULL
- * because every process belongs to a domain and
- * the domain's name cannot be NULL.
- */
- tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
- head->r.eof = true;
- }
-}
-
/* String table for /sys/kernel/security/tomoyo/stat interface. */
static const char * const tomoyo_policy_headers[TOMOYO_MAX_POLICY_STAT] = {
[TOMOYO_STAT_POLICY_UPDATES] = "update:",
@@ -2328,10 +2357,6 @@
head->poll = tomoyo_poll_log;
head->read = tomoyo_read_log;
break;
- case TOMOYO_SELFDOMAIN:
- /* /sys/kernel/security/tomoyo/self_domain */
- head->read = tomoyo_read_self_domain;
- break;
case TOMOYO_PROCESS_STATUS:
/* /sys/kernel/security/tomoyo/.process_status */
head->write = tomoyo_write_pid;
