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Config option to set a default LSM

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The LSM currently requires setting a kernel parameter at boot to select
a specific LSM.  This adds a config option that allows specifying a default
LSM that is used unless overridden with the security= kernel parameter.
If the the config option is not set the current behavior of first LSM
to register is used.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
John Johansen 2009-11-05 17:03:20 -08:00 committed by James Morris
parent 0e1a6ef2de
commit 6e65f92ff0
2 changed files with 38 additions and 3 deletions
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32
security/Kconfig
View file

@ -152,5 +152,37 @@ source security/tomoyo/Kconfig
source security/integrity/ima/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_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_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 "" if DEFAULT_SECURITY_DAC
endmenu

9
security/security.c
View file

@ -19,7 +19,8 @@
#include <linux/ima.h>
/* Boot-time LSM user choice */
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1];
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
CONFIG_DEFAULT_SECURITY;
/* things that live in capability.c */
extern struct security_operations default_security_ops;
@ -80,8 +81,10 @@ __setup("security=", choose_lsm);
*
* Return true if:
* -The passed LSM is the one chosen by user at boot time,
* -or user didn't specify a specific LSM and we're the first to ask
* for registration permission,
* -or the passed LSM is configured as the default and the user did not
* choose an alternate LSM at boot time,
* -or there is no default LSM set and the user didn't specify a
* specific LSM and we're the first to ask for registration permission,
* -or the passed LSM is currently loaded.
* Otherwise, return false.
*/