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ima: load x509 certificate from the kernel

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Define configuration option to load X509 certificate into the
IMA trusted kernel keyring. It implements ima_load_x509() hook
to load X509 certificate into the .ima trusted kernel keyring
from the root filesystem.

Changes in v3:
* use ima_policy_flag in ima_get_action()
  ima_load_x509 temporarily clears ima_policy_flag to disable
  appraisal to load key. Use it to skip appraisal rules.
* Key directory path changed to /etc/keys (Mimi)
* Expand IMA_LOAD_X509 Kconfig help

Changes in v2:
* added '__init'
* use ima_policy_flag to disable appraisal to load keys

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Dmitry Kasatkin
2014-11-05 17:01:14 +02:00
committed by Mimi Zohar
parent 65d543b233
commit fd5f4e9054
4 changed files with 44 additions and 2 deletions
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17
security/integrity/ima/ima_init.c
View File

@@ -24,6 +24,12 @@
#include <crypto/hash_info.h>
#include "ima.h"
#ifdef CONFIG_IMA_X509_PATH
#define IMA_X509_PATH CONFIG_IMA_X509_PATH
#else
#define IMA_X509_PATH "/etc/keys/x509_ima.der"
#endif
/* name for boot aggregate entry */
static const char *boot_aggregate_name = "boot_aggregate";
int ima_used_chip;
@@ -91,6 +97,17 @@ err_out:
return result;
}
#ifdef CONFIG_IMA_LOAD_X509
void __init ima_load_x509(void)
{
int unset_flags = ima_policy_flag & IMA_APPRAISE;
ima_policy_flag &= ~unset_flags;
integrity_load_x509(INTEGRITY_KEYRING_IMA, IMA_X509_PATH);
ima_policy_flag |= unset_flags;
}
#endif
int __init ima_init(void)
{
u8 pcr_i[TPM_DIGEST_SIZE];