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authorDavid Howells <dhowells@redhat.com>2005-10-07 15:07:38 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-08 14:53:31 -0700
commit468ed2b0c85ec4310b429e60358213b6d077289e (patch)
treed1f570c1b89df450753cbec8768b1c1cfac6d9a2 /security
parentf1a9badcf6ecad9975240d94514721cb93932151 (diff)
downloadlinux-linaro-stable-468ed2b0c85ec4310b429e60358213b6d077289e.tar.gz
[PATCH] Keys: Split key permissions checking into a .c file
The attached patch splits key permissions checking out of key-ui.h and moves it into a .c file. It's quite large and called quite a lot, and it's about to get bigger with the addition of LSM support for keys... key_any_permission() is also discarded as it's no longer used. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security')
-rw-r--r--security/keys/Makefile1
-rw-r--r--security/keys/permission.c70
2 files changed, 71 insertions, 0 deletions
diff --git a/security/keys/Makefile b/security/keys/Makefile
index c392d750b208..5145adfb6a05 100644
--- a/security/keys/Makefile
+++ b/security/keys/Makefile
@@ -6,6 +6,7 @@ obj-y := \
key.o \
keyring.o \
keyctl.o \
+ permission.o \
process_keys.o \
request_key.o \
request_key_auth.o \
diff --git a/security/keys/permission.c b/security/keys/permission.c
new file mode 100644
index 000000000000..1c3651670ce9
--- /dev/null
+++ b/security/keys/permission.c
@@ -0,0 +1,70 @@
+/* permission.c: key permission determination
+ *
+ * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include "internal.h"
+
+/*****************************************************************************/
+/*
+ * check to see whether permission is granted to use a key in the desired way,
+ * but permit the security modules to override
+ */
+int key_task_permission(const key_ref_t key_ref,
+ struct task_struct *context,
+ key_perm_t perm)
+{
+ struct key *key;
+ key_perm_t kperm;
+ int ret;
+
+ key = key_ref_to_ptr(key_ref);
+
+ /* use the top 8-bits of permissions for keys the caller possesses */
+ if (is_key_possessed(key_ref)) {
+ kperm = key->perm >> 24;
+ goto use_these_perms;
+ }
+
+ /* use the second 8-bits of permissions for keys the caller owns */
+ if (key->uid == context->fsuid) {
+ kperm = key->perm >> 16;
+ goto use_these_perms;
+ }
+
+ /* use the third 8-bits of permissions for keys the caller has a group
+ * membership in common with */
+ if (key->gid != -1 && key->perm & KEY_GRP_ALL) {
+ if (key->gid == context->fsgid) {
+ kperm = key->perm >> 8;
+ goto use_these_perms;
+ }
+
+ task_lock(context);
+ ret = groups_search(context->group_info, key->gid);
+ task_unlock(context);
+
+ if (ret) {
+ kperm = key->perm >> 8;
+ goto use_these_perms;
+ }
+ }
+
+ /* otherwise use the least-significant 8-bits */
+ kperm = key->perm;
+
+use_these_perms:
+ kperm = kperm & perm & KEY_ALL;
+
+ return kperm == perm;
+
+} /* end key_task_permission() */
+
+EXPORT_SYMBOL(key_task_permission);