security/integrity/ima/Kconfig

# IBM Integrity Measurement Architecture
#
config IMA
	bool "Integrity Measurement Architecture(IMA)"
	depends on SECURITY
	select INTEGRITY
	select SECURITYFS
	select CRYPTO
	select CRYPTO_HMAC
	select CRYPTO_MD5
	select CRYPTO_SHA1
	select CRYPTO_HASH_INFO
	select TCG_TPM if HAS_IOMEM && !UML
	select TCG_TIS if TCG_TPM && X86
	select TCG_IBMVTPM if TCG_TPM && PPC64
	help
	  The Trusted Computing Group(TCG) runtime Integrity
	  Measurement Architecture(IMA) maintains a list of hash
	  values of executables and other sensitive system files,
	  as they are read or executed. If an attacker manages
	  to change the contents of an important system file
	  being measured, we can tell.

	  If your system has a TPM chip, then IMA also maintains
	  an aggregate integrity value over this list inside the
	  TPM hardware, so that the TPM can prove to a third party
	  whether or not critical system files have been modified.
	  Read <http://www.usenix.org/events/sec04/tech/sailer.html>
	  to learn more about IMA.
	  If unsure, say N.

config IMA_MEASURE_PCR_IDX
	int
	depends on IMA
	range 8 14
	default 10
	help
	  IMA_MEASURE_PCR_IDX determines the TPM PCR register index
	  that IMA uses to maintain the integrity aggregate of the
	  measurement list.  If unsure, use the default 10.

config IMA_LSM_RULES
	bool
	depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK)
	default y
	help
	  Disabling this option will disregard LSM based policy rules.

choice
	prompt "Default template"
	default IMA_NG_TEMPLATE
	depends on IMA
	help
	  Select the default IMA measurement template.

	  The original 'ima' measurement list template contains a
	  hash, defined as 20 bytes, and a null terminated pathname,
	  limited to 255 characters.  The 'ima-ng' measurement list
	  template permits both larger hash digests and longer
	  pathnames.

	config IMA_TEMPLATE
		bool "ima"
	config IMA_NG_TEMPLATE
		bool "ima-ng (default)"
	config IMA_SIG_TEMPLATE
		bool "ima-sig"
endchoice

config IMA_DEFAULT_TEMPLATE
	string
	depends on IMA
	default "ima" if IMA_TEMPLATE
	default "ima-ng" if IMA_NG_TEMPLATE
	default "ima-sig" if IMA_SIG_TEMPLATE

choice
	prompt "Default integrity hash algorithm"
	default IMA_DEFAULT_HASH_SHA1
	depends on IMA
	help
	   Select the default hash algorithm used for the measurement
	   list, integrity appraisal and audit log.  The compiled default
	   hash algorithm can be overwritten using the kernel command
	   line 'ima_hash=' option.

	config IMA_DEFAULT_HASH_SHA1
		bool "SHA1 (default)"
		depends on CRYPTO_SHA1

	config IMA_DEFAULT_HASH_SHA256
		bool "SHA256"
		depends on CRYPTO_SHA256 && !IMA_TEMPLATE

	config IMA_DEFAULT_HASH_SHA512
		bool "SHA512"
		depends on CRYPTO_SHA512 && !IMA_TEMPLATE

	config IMA_DEFAULT_HASH_WP512
		bool "WP512"
		depends on CRYPTO_WP512 && !IMA_TEMPLATE
endchoice

config IMA_DEFAULT_HASH
	string
	depends on IMA
	default "sha1" if IMA_DEFAULT_HASH_SHA1
	default "sha256" if IMA_DEFAULT_HASH_SHA256
	default "sha512" if IMA_DEFAULT_HASH_SHA512
	default "wp512" if IMA_DEFAULT_HASH_WP512

config IMA_APPRAISE
	bool "Appraise integrity measurements"
	depends on IMA
	default n
	help
	  This option enables local measurement integrity appraisal.
	  It requires the system to be labeled with a security extended
	  attribute containing the file hash measurement.  To protect
	  the security extended attributes from offline attack, enable
	  and configure EVM.

	  For more information on integrity appraisal refer to:
	  <http://linux-ima.sourceforge.net>
	  If unsure, say N.

config IMA_TRUSTED_KEYRING
	bool "Require all keys on the _ima keyring be signed"
	depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
	default y
	help
	   This option requires that all keys added to the _ima
	   keyring be signed by a key on the system trusted keyring.