[PATCH 06/20] ima: create '_ima' as a builtin 'trusted' keyring

[Dmitry Kasatkin]

Require all keys added to the IMA keyring be signed by an
existing trusted key on the system trusted keyring.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@xxxxxxxxxxx>
---
 security/integrity/ima/Kconfig    | 9 +++++++++
 security/integrity/ima/ima_init.c | 1 +
 2 files changed, 10 insertions(+)

diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index 5f95e50..be11c01 100644
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -122,3 +122,12 @@ config IMA_APPRAISE
 	  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 && SYSTEM_TRUSTED_KEYRING
+	select INTEGRITY_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.
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index e8f9d70..515c1a2 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -107,6 +107,7 @@ int __init ima_init(void)
 
 	ima_add_boot_aggregate();	/* boot aggregate must be first entry */
 	ima_init_policy();
+	integrity_init_keyring(INTEGRITY_KEYRING_IMA);
 
 	return ima_fs_init();
 }
-- 
1.8.3.2

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