integrity: IMA as an integrity service provider

IMA provides hardware (TPM) based measurement and attestation for
file measurements. As the Trusted Computing (TPM) model requires,
IMA measures all files before they are accessed in any way (on the
integrity_bprm_check, integrity_path_check and integrity_file_mmap
hooks), and commits the measurements to the TPM. Once added to the
TPM, measurements can not be removed.

In addition, IMA maintains a list of these file measurements, which
can be used to validate the aggregate value stored in the TPM.  The
TPM can sign these measurements, and thus the system can prove, to
itself and to a third party, the system's integrity in a way that
cannot be circumvented by malicious or compromised software.

- alloc ima_template_entry before calling ima_store_template()
- log ima_add_boot_aggregate() failure
- removed unused IMA_TEMPLATE_NAME_LEN
- replaced hard coded string length with #define name

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/security/Kconfig b/security/Kconfig
index d9f47ce7e207..a79b23f73d03 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -55,7 +55,8 @@ config SECURITYFS
         bool "Enable the securityfs filesystem"
         help
           This will build the securityfs filesystem.  It is currently used by
-          the TPM bios character driver.  It is not used by SELinux or SMACK.
+          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.
 
@@ -126,5 +127,7 @@ config SECURITY_DEFAULT_MMAP_MIN_ADDR
 source security/selinux/Kconfig
 source security/smack/Kconfig
 
+source security/integrity/ima/Kconfig
+
 endmenu