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From: "Michael Weiß" <michael.weiss@aisec.fraunhofer.de>
To: Paul Moore <paul@paul-moore.com>,
	Casey Schaufler <casey@schaufler-ca.com>
Cc: "Michael Weiß" <michael.weiss@aisec.fraunhofer.de>,
	"Mike Snitzer" <snitzer@redhat.com>,
	linux-kernel@vger.kernel.org, "Eric Paris" <eparis@redhat.com>,
	linux-raid@vger.kernel.org, "Song Liu" <song@kernel.org>,
	dm-devel@redhat.com, linux-audit@redhat.com,
	"Alasdair Kergon" <agk@redhat.com>
Subject: [PATCH v3 3/3] dm crypt: log aead integrity violations to audit subsystem
Date: Tue, 31 Aug 2021 21:18:40 +0200	[thread overview]
Message-ID: <20210831191845.7928-4-michael.weiss@aisec.fraunhofer.de> (raw)
In-Reply-To: <20210831191845.7928-1-michael.weiss@aisec.fraunhofer.de>

Since dm-crypt target can be stacked on dm-integrity targets to
provide authenticated encryption, integrity violations are recognized
here during aead computation. We use the dm-audit submodule to
signal those events to user space, too.

The construction and destruction of crypt device mappings are also
logged as audit events.

Signed-off-by: Michael Weiß <michael.weiss@aisec.fraunhofer.de>
---
 drivers/md/dm-crypt.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 50f4cbd600d5..5e02002345fa 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -41,6 +41,8 @@
 
 #include <linux/device-mapper.h>
 
+#include "dm-audit.h"
+
 #define DM_MSG_PREFIX "crypt"
 
 /*
@@ -1362,8 +1364,12 @@ static int crypt_convert_block_aead(struct crypt_config *cc,
 
 	if (r == -EBADMSG) {
 		char b[BDEVNAME_SIZE];
-		DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
-			    (unsigned long long)le64_to_cpu(*sector));
+		sector_t s = le64_to_cpu(*sector);
+
+		DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu",
+			    bio_devname(ctx->bio_in, b), s);
+		dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead",
+				 ctx->bio_in, s, 0);
 	}
 
 	if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
@@ -2173,8 +2179,12 @@ static void kcryptd_async_done(struct crypto_async_request *async_req,
 
 	if (error == -EBADMSG) {
 		char b[BDEVNAME_SIZE];
-		DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b),
-			    (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)));
+		sector_t s = le64_to_cpu(*org_sector_of_dmreq(cc, dmreq));
+
+		DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu",
+			    bio_devname(ctx->bio_in, b), s);
+		dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead",
+				 ctx->bio_in, s, 0);
 		io->error = BLK_STS_PROTECTION;
 	} else if (error < 0)
 		io->error = BLK_STS_IOERR;
@@ -2729,6 +2739,8 @@ static void crypt_dtr(struct dm_target *ti)
 	dm_crypt_clients_n--;
 	crypt_calculate_pages_per_client();
 	spin_unlock(&dm_crypt_clients_lock);
+
+	dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1);
 }
 
 static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
@@ -3357,9 +3369,11 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	ti->num_flush_bios = 1;
 	ti->limit_swap_bios = true;
 
+	dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1);
 	return 0;
 
 bad:
+	dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0);
 	crypt_dtr(ti);
 	return ret;
 }
-- 
2.20.1

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      parent reply	other threads:[~2021-08-31 19:44 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-31 19:18 [PATCH v3 0/3] dm: audit event logging Michael Weiß
2021-08-31 19:18 ` [PATCH v3 1/3] dm: introduce audit event module for device mapper Michael Weiß
2021-09-03 17:27   ` Paul Moore
2021-09-04  9:24     ` Weiß, Michael
2021-08-31 19:18 ` [PATCH v3 2/3] dm integrity: log audit events for dm-integrity target Michael Weiß
2021-08-31 19:18 ` Michael Weiß [this message]

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