[PATCHv3 1/6] integrity: define '.evm' as a builtin 'trusted' keyring
From: Dmitry Kasatkin
Date: Thu Oct 22 2015 - 14:52:05 EST
Require all keys added to the EVM keyring be signed by an
existing trusted key on the system trusted keyring.
This patch also switches IMA to use integrity_init_keyring().
Changes in v3:
* Added 'init_keyring' config based variable to skip initializing
keyring instead of using __integrity_init_keyring() wrapper.
* Added dependency back to CONFIG_IMA_TRUSTED_KEYRING
Changes in v2:
* Replace CONFIG_EVM_TRUSTED_KEYRING with IMA and EVM common
CONFIG_INTEGRITY_TRUSTED_KEYRING configuration option
* Deprecate CONFIG_IMA_TRUSTED_KEYRING but keep it for config
file compatibility. (Mimi Zohar)
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@xxxxxxxxxx>
---
security/integrity/Kconfig | 11 +++++++++++
security/integrity/digsig.c | 14 ++++++++++++--
security/integrity/evm/evm_main.c | 8 +++++---
security/integrity/ima/Kconfig | 5 ++++-
security/integrity/ima/ima.h | 12 ------------
security/integrity/ima/ima_init.c | 2 +-
security/integrity/integrity.h | 5 ++---
7 files changed, 35 insertions(+), 22 deletions(-)
diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
index 73c457b..21d7568 100644
--- a/security/integrity/Kconfig
+++ b/security/integrity/Kconfig
@@ -41,6 +41,17 @@ config INTEGRITY_ASYMMETRIC_KEYS
This option enables digital signature verification using
asymmetric keys.
+config INTEGRITY_TRUSTED_KEYRING
+ bool "Require all keys on the integrity keyrings be signed"
+ depends on SYSTEM_TRUSTED_KEYRING
+ depends on INTEGRITY_ASYMMETRIC_KEYS
+ select KEYS_DEBUG_PROC_KEYS
+ default y
+ help
+ This option requires that all keys added to the .ima and
+ .evm keyrings be signed by a key on the system trusted
+ keyring.
+
config INTEGRITY_AUDIT
bool "Enables integrity auditing support "
depends on AUDIT
diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index 5be9ffb..8ef1511 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -24,15 +24,22 @@
static struct key *keyring[INTEGRITY_KEYRING_MAX];
static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
+#ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
"_evm",
- "_module",
-#ifndef CONFIG_IMA_TRUSTED_KEYRING
"_ima",
#else
+ ".evm",
".ima",
#endif
+ "_module",
};
+#ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING
+static bool init_keyring __initdata = true;
+#else
+static bool init_keyring __initdata;
+#endif
+
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
const char *digest, int digestlen)
{
@@ -68,6 +75,9 @@ int __init integrity_init_keyring(const unsigned int id)
const struct cred *cred = current_cred();
int err = 0;
+ if (!init_keyring)
+ return 0;
+
keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
KGIDT_INIT(0), cred,
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c
index 1334e02..75b7e30 100644
--- a/security/integrity/evm/evm_main.c
+++ b/security/integrity/evm/evm_main.c
@@ -478,15 +478,17 @@ static int __init init_evm(void)
evm_init_config();
+ error = integrity_init_keyring(INTEGRITY_KEYRING_EVM);
+ if (error)
+ return error;
+
error = evm_init_secfs();
if (error < 0) {
pr_info("Error registering secfs\n");
- goto err;
+ return error;
}
return 0;
-err:
- return error;
}
/*
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index df30334..a292b88 100644
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -123,14 +123,17 @@ config IMA_APPRAISE
If unsure, say N.
config IMA_TRUSTED_KEYRING
- bool "Require all keys on the .ima keyring be signed"
+ bool "Require all keys on the .ima keyring be signed (deprecated)"
depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
depends on INTEGRITY_ASYMMETRIC_KEYS
+ 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.
+ This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
+
config IMA_LOAD_X509
bool "Load X509 certificate onto the '.ima' trusted keyring"
depends on IMA_TRUSTED_KEYRING
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index e2a60c3..9e82367 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -251,16 +251,4 @@ static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
return -EINVAL;
}
#endif /* CONFIG_IMA_LSM_RULES */
-
-#ifdef CONFIG_IMA_TRUSTED_KEYRING
-static inline int ima_init_keyring(const unsigned int id)
-{
- return integrity_init_keyring(id);
-}
-#else
-static inline int ima_init_keyring(const unsigned int id)
-{
- return 0;
-}
-#endif /* CONFIG_IMA_TRUSTED_KEYRING */
#endif
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index e600cad..bd79f25 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -116,7 +116,7 @@ int __init ima_init(void)
if (!ima_used_chip)
pr_info("No TPM chip found, activating TPM-bypass!\n");
- rc = ima_init_keyring(INTEGRITY_KEYRING_IMA);
+ rc = integrity_init_keyring(INTEGRITY_KEYRING_IMA);
if (rc)
return rc;
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 9c61687..07726a7 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -125,8 +125,8 @@ int integrity_kernel_read(struct file *file, loff_t offset,
int __init integrity_read_file(const char *path, char **data);
#define INTEGRITY_KEYRING_EVM 0
-#define INTEGRITY_KEYRING_MODULE 1
-#define INTEGRITY_KEYRING_IMA 2
+#define INTEGRITY_KEYRING_IMA 1
+#define INTEGRITY_KEYRING_MODULE 2
#define INTEGRITY_KEYRING_MAX 3
#ifdef CONFIG_INTEGRITY_SIGNATURE
@@ -149,7 +149,6 @@ static inline int integrity_init_keyring(const unsigned int id)
{
return 0;
}
-
#endif /* CONFIG_INTEGRITY_SIGNATURE */
#ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS
--
2.1.4
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