238 lines
8.0 KiB
Plaintext
238 lines
8.0 KiB
Plaintext
#
|
|
# 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 TRUSTED_KEYS
|
|
tristate "TRUSTED KEYS"
|
|
depends on KEYS && TCG_TPM
|
|
select CRYPTO
|
|
select CRYPTO_HMAC
|
|
select CRYPTO_SHA1
|
|
help
|
|
This option provides support for creating, sealing, and unsealing
|
|
keys in the kernel. Trusted keys are random number symmetric keys,
|
|
generated and RSA-sealed by the TPM. The TPM only unseals the keys,
|
|
if the boot PCRs and other criteria match. Userspace will only ever
|
|
see encrypted blobs.
|
|
|
|
If you are unsure as to whether this is required, answer N.
|
|
|
|
config ENCRYPTED_KEYS
|
|
tristate "ENCRYPTED KEYS"
|
|
depends on KEYS
|
|
select CRYPTO
|
|
select CRYPTO_HMAC
|
|
select CRYPTO_AES
|
|
select CRYPTO_CBC
|
|
select CRYPTO_SHA256
|
|
select CRYPTO_RNG
|
|
help
|
|
This option provides support for create/encrypting/decrypting keys
|
|
in the kernel. Encrypted keys are kernel generated random numbers,
|
|
which are encrypted/decrypted with a 'master' symmetric key. The
|
|
'master' key can be either a trusted-key or user-key type.
|
|
Userspace only ever sees/stores encrypted blobs.
|
|
|
|
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_DMESG_RESTRICT
|
|
bool "Restrict unprivileged access to the kernel syslog"
|
|
default n
|
|
help
|
|
This enforces restrictions on unprivileged users reading the kernel
|
|
syslog via dmesg(8).
|
|
|
|
If this option is not selected, no restrictions will be enforced
|
|
unless the dmesg_restrict sysctl is explicitly set to (1).
|
|
|
|
If you are unsure how to answer this question, 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 SECURITYFS
|
|
bool "Enable the securityfs filesystem"
|
|
help
|
|
This will build the securityfs filesystem. It is currently used by
|
|
the TPM bios character driver and IMA, an integrity provider. It is
|
|
not used by SELinux or SMACK.
|
|
|
|
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_PATH
|
|
bool "Security hooks for pathname based access control"
|
|
depends on SECURITY
|
|
help
|
|
This enables the security hooks for pathname based access control.
|
|
If enabled, a security module can use these hooks to
|
|
implement pathname based access controls.
|
|
If you are unsure how to answer this question, answer N.
|
|
|
|
config INTEL_TXT
|
|
bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
|
|
depends on HAVE_INTEL_TXT
|
|
help
|
|
This option enables support for booting the kernel with the
|
|
Trusted Boot (tboot) module. This will utilize
|
|
Intel(R) Trusted Execution Technology to perform a measured launch
|
|
of the kernel. If the system does not support Intel(R) TXT, this
|
|
will have no effect.
|
|
|
|
Intel TXT will provide higher assurance of system configuration and
|
|
initial state as well as data reset protection. This is used to
|
|
create a robust initial kernel measurement and verification, which
|
|
helps to ensure that kernel security mechanisms are functioning
|
|
correctly. This level of protection requires a root of trust outside
|
|
of the kernel itself.
|
|
|
|
Intel TXT also helps solve real end user concerns about having
|
|
confidence that their hardware is running the VMM or kernel that
|
|
it was configured with, especially since they may be responsible for
|
|
providing such assurances to VMs and services running on it.
|
|
|
|
See <http://www.intel.com/technology/security/> for more information
|
|
about Intel(R) TXT.
|
|
See <http://tboot.sourceforge.net> for more information about tboot.
|
|
See Documentation/intel_txt.txt for a description of how to enable
|
|
Intel TXT support in a kernel boot.
|
|
|
|
If you are unsure as to whether this is required, answer N.
|
|
|
|
config LSM_MMAP_MIN_ADDR
|
|
int "Low address space for LSM to protect from user allocation"
|
|
depends on SECURITY && SECURITY_SELINUX
|
|
default 32768 if ARM
|
|
default 65536
|
|
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 or have some need to map
|
|
this low address space will need the permission specific to the
|
|
systems running LSM.
|
|
|
|
source security/selinux/Kconfig
|
|
source security/smack/Kconfig
|
|
source security/tomoyo/Kconfig
|
|
source security/apparmor/Kconfig
|
|
source security/yama/Kconfig
|
|
|
|
source security/integrity/Kconfig
|
|
|
|
choice
|
|
prompt "Default security module"
|
|
default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
|
|
default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
|
|
default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
|
|
default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
|
|
default DEFAULT_SECURITY_YAMA if SECURITY_YAMA
|
|
default DEFAULT_SECURITY_DAC
|
|
|
|
help
|
|
Select the security module that will be used by default if the
|
|
kernel parameter security= is not specified.
|
|
|
|
config DEFAULT_SECURITY_SELINUX
|
|
bool "SELinux" if SECURITY_SELINUX=y
|
|
|
|
config DEFAULT_SECURITY_SMACK
|
|
bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
|
|
|
|
config DEFAULT_SECURITY_TOMOYO
|
|
bool "TOMOYO" if SECURITY_TOMOYO=y
|
|
|
|
config DEFAULT_SECURITY_APPARMOR
|
|
bool "AppArmor" if SECURITY_APPARMOR=y
|
|
|
|
config DEFAULT_SECURITY_YAMA
|
|
bool "Yama" if SECURITY_YAMA=y
|
|
|
|
config DEFAULT_SECURITY_DAC
|
|
bool "Unix Discretionary Access Controls"
|
|
|
|
endchoice
|
|
|
|
config DEFAULT_SECURITY
|
|
string
|
|
default "selinux" if DEFAULT_SECURITY_SELINUX
|
|
default "smack" if DEFAULT_SECURITY_SMACK
|
|
default "tomoyo" if DEFAULT_SECURITY_TOMOYO
|
|
default "apparmor" if DEFAULT_SECURITY_APPARMOR
|
|
default "yama" if DEFAULT_SECURITY_YAMA
|
|
default "" if DEFAULT_SECURITY_DAC
|
|
|
|
endmenu
|
|
|