All of lore.kernel.org
 help / color / mirror / Atom feed
From: Tyler Hicks <tyhicks@linux.microsoft.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: James Morris <jmorris@namei.org>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	Lakshmi Ramasubramanian <nramas@linux.microsoft.com>,
	Tushar Sugandhi <tusharsu@linux.microsoft.com>,
	Nayna Jain <nayna@linux.ibm.com>,
	linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org
Subject: [PATCH 2/2] ima: Fail rule parsing when asymmetric key measurement isn't supportable
Date: Mon, 27 Jul 2020 09:08:31 -0500	[thread overview]
Message-ID: <20200727140831.64251-3-tyhicks@linux.microsoft.com> (raw)
In-Reply-To: <20200727140831.64251-1-tyhicks@linux.microsoft.com>

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 <tyhicks@linux.microsoft.com>
---
 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


  parent reply	other threads:[~2020-07-27 14:40 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-27 14:08 [PATCH 0/2] ima: Fix keyrings race condition and other key related bugs Tyler Hicks
2020-07-27 14:08 ` [PATCH 1/2] ima: Pre-parse the list of keyrings in a KEY_CHECK rule Tyler Hicks
2020-07-28 14:25   ` Lakshmi Ramasubramanian
2020-08-06 15:34   ` Nayna
2020-08-06 15:46     ` Tyler Hicks
2020-07-27 14:08 ` Tyler Hicks [this message]
2020-07-28 14:14   ` [PATCH 2/2] ima: Fail rule parsing when asymmetric key measurement isn't supportable Lakshmi Ramasubramanian

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200727140831.64251-3-tyhicks@linux.microsoft.com \
    --to=tyhicks@linux.microsoft.com \
    --cc=dmitry.kasatkin@gmail.com \
    --cc=jmorris@namei.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-security-module@vger.kernel.org \
    --cc=nayna@linux.ibm.com \
    --cc=nramas@linux.microsoft.com \
    --cc=serge@hallyn.com \
    --cc=tusharsu@linux.microsoft.com \
    --cc=zohar@linux.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.