Implement file posix capabilities
Implement file posix capabilities. This allows programs to be given a
subset of root's powers regardless of who runs them, without having to use
setuid and giving the binary all of root's powers.
This version works with Kaigai Kohei's userspace tools, found at
http://www.kaigai.gr.jp/index.php. For more information on how to use this
patch, Chris Friedhoff has posted a nice page at
http://www.friedhoff.org/fscaps.html.
Changelog:
Nov 27:
Incorporate fixes from Andrew Morton
(security-introduce-file-caps-tweaks and
security-introduce-file-caps-warning-fix)
Fix Kconfig dependency.
Fix change signaling behavior when file caps are not compiled in.
Nov 13:
Integrate comments from Alexey: Remove CONFIG_ ifdef from
capability.h, and use %zd for printing a size_t.
Nov 13:
Fix endianness warnings by sparse as suggested by Alexey
Dobriyan.
Nov 09:
Address warnings of unused variables at cap_bprm_set_security
when file capabilities are disabled, and simultaneously clean
up the code a little, by pulling the new code into a helper
function.
Nov 08:
For pointers to required userspace tools and how to use
them, see http://www.friedhoff.org/fscaps.html.
Nov 07:
Fix the calculation of the highest bit checked in
check_cap_sanity().
Nov 07:
Allow file caps to be enabled without CONFIG_SECURITY, since
capabilities are the default.
Hook cap_task_setscheduler when !CONFIG_SECURITY.
Move capable(TASK_KILL) to end of cap_task_kill to reduce
audit messages.
Nov 05:
Add secondary calls in selinux/hooks.c to task_setioprio and
task_setscheduler so that selinux and capabilities with file
cap support can be stacked.
Sep 05:
As Seth Arnold points out, uid checks are out of place
for capability code.
Sep 01:
Define task_setscheduler, task_setioprio, cap_task_kill, and
task_setnice to make sure a user cannot affect a process in which
they called a program with some fscaps.
One remaining question is the note under task_setscheduler: are we
ok with CAP_SYS_NICE being sufficient to confine a process to a
cpuset?
It is a semantic change, as without fsccaps, attach_task doesn't
allow CAP_SYS_NICE to override the uid equivalence check. But since
it uses security_task_setscheduler, which elsewhere is used where
CAP_SYS_NICE can be used to override the uid equivalence check,
fixing it might be tough.
task_setscheduler
note: this also controls cpuset:attach_task. Are we ok with
CAP_SYS_NICE being used to confine to a cpuset?
task_setioprio
task_setnice
sys_setpriority uses this (through set_one_prio) for another
process. Need same checks as setrlimit
Aug 21:
Updated secureexec implementation to reflect the fact that
euid and uid might be the same and nonzero, but the process
might still have elevated caps.
Aug 15:
Handle endianness of xattrs.
Enforce capability version match between kernel and disk.
Enforce that no bits beyond the known max capability are
set, else return -EPERM.
With this extra processing, it may be worth reconsidering
doing all the work at bprm_set_security rather than
d_instantiate.
Aug 10:
Always call getxattr at bprm_set_security, rather than
caching it at d_instantiate.
[morgan@kernel.org: file-caps clean up for linux/capability.h]
[bunk@kernel.org: unexport cap_inode_killpriv]
Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <jmorris@namei.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Andrew Morgan <morgan@kernel.org>
Signed-off-by: Andrew Morgan <morgan@kernel.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 2dfa585..8961e7f 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -1,14 +1,14 @@
/*
* This is <linux/capability.h>
*
- * Andrew G. Morgan <morgan@transmeta.com>
+ * Andrew G. Morgan <morgan@kernel.org>
* Alexander Kjeldaas <astor@guardian.no>
* with help from Aleph1, Roland Buresund and Andrew Main.
*
* See here for the libcap library ("POSIX draft" compliance):
*
- * ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.2/
- */
+ * ftp://linux.kernel.org/pub/linux/libs/security/linux-privs/kernel-2.6/
+ */
#ifndef _LINUX_CAPABILITY_H
#define _LINUX_CAPABILITY_H
@@ -28,23 +28,41 @@
following structure to such a composite is better handled in a user
library since the draft standard requires the use of malloc/free
etc.. */
-
+
#define _LINUX_CAPABILITY_VERSION 0x19980330
typedef struct __user_cap_header_struct {
__u32 version;
int pid;
} __user *cap_user_header_t;
-
+
typedef struct __user_cap_data_struct {
__u32 effective;
__u32 permitted;
__u32 inheritable;
} __user *cap_user_data_t;
-
-#ifdef __KERNEL__
-#include <asm/current.h>
+#define XATTR_CAPS_SUFFIX "capability"
+#define XATTR_NAME_CAPS XATTR_SECURITY_PREFIX XATTR_CAPS_SUFFIX
+
+#define XATTR_CAPS_SZ (3*sizeof(__le32))
+#define VFS_CAP_REVISION_MASK 0xFF000000
+#define VFS_CAP_REVISION_1 0x01000000
+
+#define VFS_CAP_REVISION VFS_CAP_REVISION_1
+
+#define VFS_CAP_FLAGS_MASK ~VFS_CAP_REVISION_MASK
+#define VFS_CAP_FLAGS_EFFECTIVE 0x000001
+
+struct vfs_cap_data {
+ __u32 magic_etc; /* Little endian */
+ struct {
+ __u32 permitted; /* Little endian */
+ __u32 inheritable; /* Little endian */
+ } data[1];
+};
+
+#ifdef __KERNEL__
/* #define STRICT_CAP_T_TYPECHECKS */
@@ -59,7 +77,7 @@
typedef __u32 kernel_cap_t;
#endif
-
+
#define _USER_CAP_HEADER_SIZE (2*sizeof(__u32))
#define _KERNEL_CAP_T_SIZE (sizeof(kernel_cap_t))
@@ -67,7 +85,7 @@
/**
- ** POSIX-draft defined capabilities.
+ ** POSIX-draft defined capabilities.
**/
/* In a system with the [_POSIX_CHOWN_RESTRICTED] option defined, this
@@ -87,7 +105,7 @@
defined. Excluding DAC access covered by CAP_LINUX_IMMUTABLE. */
#define CAP_DAC_READ_SEARCH 2
-
+
/* Overrides all restrictions about allowed operations on files, where
file owner ID must be equal to the user ID, except where CAP_FSETID
is applicable. It doesn't override MAC and DAC restrictions. */
@@ -257,7 +275,7 @@
/* Override reserved space on ext2 filesystem */
/* Modify data journaling mode on ext3 filesystem (uses journaling
resources) */
-/* NOTE: ext2 honors fsuid when checking for resource overrides, so
+/* NOTE: ext2 honors fsuid when checking for resource overrides, so
you can override using fsuid too */
/* Override size restrictions on IPC message queues */
/* Allow more than 64hz interrupts from the real-time clock */
@@ -289,8 +307,10 @@
#define CAP_AUDIT_CONTROL 30
+#define CAP_SETFCAP 31
+
#ifdef __KERNEL__
-/*
+/*
* Bounding set
*/
extern kernel_cap_t cap_bset;
@@ -298,7 +318,7 @@
/*
* Internal kernel functions only
*/
-
+
#ifdef STRICT_CAP_T_TYPECHECKS
#define to_cap_t(x) { x }