[deliverable/linux.git] / security / Kconfig

#
# Security configuration
#

menu "Security options"

config KEYS
	bool "Enable access key retention support"
	help
	  This option provides support for retaining authentication tokens and
	  access keys in the kernel.

	  It also includes provision of methods by which such keys might be
	  associated with a process so that network filesystems, encryption
	  support and the like can find them.

	  Furthermore, a special type of key is available that acts as keyring:
	  a searchable sequence of keys. Each process is equipped with access
	  to five standard keyrings: UID-specific, GID-specific, session,
	  process and thread.

	  If you are unsure as to whether this is required, answer N.

config KEYS_DEBUG_PROC_KEYS
	bool "Enable the /proc/keys file by which keys may be viewed"
	depends on KEYS
	help
	  This option turns on support for the /proc/keys file - through which
	  can be listed all the keys on the system that are viewable by the
	  reading process.

	  The only keys included in the list are those that grant View
	  permission to the reading process whether or not it possesses them.
	  Note that LSM security checks are still performed, and may further
	  filter out keys that the current process is not authorised to view.

	  Only key attributes are listed here; key payloads are not included in
	  the resulting table.

	  If you are unsure as to whether this is required, answer N.

config SECURITY
	bool "Enable different security models"
	depends on SYSFS
	help
	  This allows you to choose different security modules to be
	  configured into your kernel.

	  If this option is not selected, the default Linux security
	  model will be used.

	  If you are unsure how to answer this question, answer N.

config SECURITY_NETWORK
	bool "Socket and Networking Security Hooks"
	depends on SECURITY
	help
	  This enables the socket and networking security hooks.
	  If enabled, a security module can use these hooks to
	  implement socket and networking access controls.
	  If you are unsure how to answer this question, answer N.

config SECURITY_NETWORK_XFRM
	bool "XFRM (IPSec) Networking Security Hooks"
	depends on XFRM && SECURITY_NETWORK
	help
	  This enables the XFRM (IPSec) networking security hooks.
	  If enabled, a security module can use these hooks to
	  implement per-packet access controls based on labels
	  derived from IPSec policy.  Non-IPSec communications are
	  designated as unlabelled, and only sockets authorized
	  to communicate unlabelled data can send without using
	  IPSec.
	  If you are unsure how to answer this question, answer N.

config SECURITY_FILE_CAPABILITIES
	bool "File POSIX Capabilities"
	default n
	help
	  This enables filesystem capabilities, allowing you to give
	  binaries a subset of root's powers without using setuid 0.

	  If in doubt, answer N.

config SECURITY_ROOTPLUG
	bool "Root Plug Support"
	depends on USB=y && SECURITY
	help
	  This is a sample LSM module that should only be used as such.
	  It prevents any programs running with egid == 0 if a specific
	  USB device is not present in the system.

	  See <http://www.linuxjournal.com/article.php?sid=6279> for
	  more information about this module.
	  
	  If you are unsure how to answer this question, answer N.

config SECURITY_DEFAULT_MMAP_MIN_ADDR
        int "Low address space to protect from user allocation"
        depends on SECURITY
        default 0
        help
	  This is the portion of low virtual memory which should be protected
	  from userspace allocation.  Keeping a user from writing to low pages
	  can help reduce the impact of kernel NULL pointer bugs.

	  For most ia64, ppc64 and x86 users with lots of address space
	  a value of 65536 is reasonable and should cause no problems.
	  On arm and other archs it should not be higher than 32768.
	  Programs which use vm86 functionality would either need additional
	  permissions from either the LSM or the capabilities module or have
	  this protection disabled.

	  This value can be changed after boot using the
	  /proc/sys/vm/mmap_min_addr tunable.


source security/selinux/Kconfig
source security/smack/Kconfig

endmenu
Commit	Line	Data
1da177e4 LT	1	#
	2	# Security configuration
	3	#
	4
	5	menu "Security options"
	6
	7	config KEYS
	8	bool "Enable access key retention support"
	9	help
	10	This option provides support for retaining authentication tokens and
	11	access keys in the kernel.
	12
	13	It also includes provision of methods by which such keys might be
	14	associated with a process so that network filesystems, encryption
	15	support and the like can find them.
	16
	17	Furthermore, a special type of key is available that acts as keyring:
	18	a searchable sequence of keys. Each process is equipped with access
	19	to five standard keyrings: UID-specific, GID-specific, session,
	20	process and thread.
	21
	22	If you are unsure as to whether this is required, answer N.
	23
	24	config KEYS_DEBUG_PROC_KEYS
06ec7be5	25	bool "Enable the /proc/keys file by which keys may be viewed"
1da177e4 LT	26	depends on KEYS
1da177e4 LT	27	help
06ec7be5 ML	28	This option turns on support for the /proc/keys file - through which
	29	can be listed all the keys on the system that are viewable by the
	30	reading process.
1da177e4	31
06ec7be5 ML	32	The only keys included in the list are those that grant View
	33	permission to the reading process whether or not it possesses them.
	34	Note that LSM security checks are still performed, and may further
	35	filter out keys that the current process is not authorised to view.
	36
	37	Only key attributes are listed here; key payloads are not included in
	38	the resulting table.
	39
	40	If you are unsure as to whether this is required, answer N.
1da177e4 LT	41
	42	config SECURITY
	43	bool "Enable different security models"
2c40579b	44	depends on SYSFS
1da177e4 LT	45	help
	46	This allows you to choose different security modules to be
	47	configured into your kernel.
	48
	49	If this option is not selected, the default Linux security
	50	model will be used.
	51
	52	If you are unsure how to answer this question, answer N.
	53
	54	config SECURITY_NETWORK
	55	bool "Socket and Networking Security Hooks"
	56	depends on SECURITY
	57	help
	58	This enables the socket and networking security hooks.
	59	If enabled, a security module can use these hooks to
	60	implement socket and networking access controls.
	61	If you are unsure how to answer this question, answer N.
df71837d TJ	62
	63	config SECURITY_NETWORK_XFRM
	64	bool "XFRM (IPSec) Networking Security Hooks"
	65	depends on XFRM && SECURITY_NETWORK
	66	help
	67	This enables the XFRM (IPSec) networking security hooks.
	68	If enabled, a security module can use these hooks to
	69	implement per-packet access controls based on labels
	70	derived from IPSec policy. Non-IPSec communications are
	71	designated as unlabelled, and only sockets authorized
	72	to communicate unlabelled data can send without using
	73	IPSec.
	74	If you are unsure how to answer this question, answer N.
1da177e4	75
b5376771	76	config SECURITY_FILE_CAPABILITIES
84aaa7ab	77	bool "File POSIX Capabilities"
b5376771 SH	78	default n
	79	help
	80	This enables filesystem capabilities, allowing you to give
	81	binaries a subset of root's powers without using setuid 0.
	82
	83	If in doubt, answer N.
	84
1da177e4	85	config SECURITY_ROOTPLUG
20510f2f JM	86	bool "Root Plug Support"
20510f2f JM	87	depends on USB=y && SECURITY
1da177e4 LT	88	help
	89	This is a sample LSM module that should only be used as such.
	90	It prevents any programs running with egid == 0 if a specific
	91	USB device is not present in the system.
	92
	93	See <http://www.linuxjournal.com/article.php?sid=6279> for
	94	more information about this module.
	95
	96	If you are unsure how to answer this question, answer N.
	97
a5ecbcb8 EP	98	config SECURITY_DEFAULT_MMAP_MIN_ADDR
	99	int "Low address space to protect from user allocation"
	100	depends on SECURITY
	101	default 0
	102	help
	103	This is the portion of low virtual memory which should be protected
	104	from userspace allocation. Keeping a user from writing to low pages
	105	can help reduce the impact of kernel NULL pointer bugs.
	106
5f46ce14	107	For most ia64, ppc64 and x86 users with lots of address space
	108	a value of 65536 is reasonable and should cause no problems.
	109	On arm and other archs it should not be higher than 32768.
	110	Programs which use vm86 functionality would either need additional
	111	permissions from either the LSM or the capabilities module or have
	112	this protection disabled.
a5ecbcb8 EP	113
	114	This value can be changed after boot using the
	115	/proc/sys/vm/mmap_min_addr tunable.
	116
	117
1da177e4	118	source security/selinux/Kconfig
e114e473	119	source security/smack/Kconfig
1da177e4 LT	120
	121	endmenu
	122