[PATCH 2/2] ima: Fail rule parsing when asymmetric key measurement isn't supportable
From: Tyler Hicks <hidden>
Date: 2020-07-27 14:40:06
Also in:
linux-integrity, lkml
Subsystem:
extended verification module (evm), integrity measurement architecture (ima), security subsystem, the rest · Maintainers:
Mimi Zohar, Roberto Sassu, Dmitry Kasatkin, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
Measuring keys is currently only supported for asymmetric keys. In the
future, this might change.
For now, the "func=KEY_CHECK" and "keyrings=" options are only
appropriate when CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS is enabled. Make
this clear at policy load so that IMA policy authors don't assume that
these policy language constructs are supported.
Fixes: 2b60c0ecedf8 ("IMA: Read keyrings= option from the IMA policy")
Fixes: 5808611cccb2 ("IMA: Add KEY_CHECK func to measure keys")
Suggested-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Tyler Hicks <redacted>
---
security/integrity/ima/ima_policy.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index c328cfa0fc49..05f012fd3dca 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c@@ -1233,7 +1233,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) entry->func = POLICY_CHECK; else if (strcmp(args[0].from, "KEXEC_CMDLINE") == 0) entry->func = KEXEC_CMDLINE; - else if (strcmp(args[0].from, "KEY_CHECK") == 0) + else if (IS_ENABLED(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) && + strcmp(args[0].from, "KEY_CHECK") == 0) entry->func = KEY_CHECK; else result = -EINVAL;
@@ -1290,7 +1291,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry) case Opt_keyrings: ima_log_string(ab, "keyrings", args[0].from); - if (entry->keyrings) { + if (!IS_ENABLED(CONFIG_IMA_MEASURE_ASYMMETRIC_KEYS) || + entry->keyrings) { result = -EINVAL; break; }
--
2.25.1