linux-kernel - [PATCH 3.16 101/370] libceph: verify authorize reply on connect

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Message-ID: <lsq.1489146382.790731565@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:22 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Sage Weil" <sage@...hat.com>,
        "Ilya Dryomov" <idryomov@...il.com>
Subject: [PATCH 3.16 101/370] libceph: verify authorize reply on connect

3.16.42-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ilya Dryomov <idryomov@...il.com>

commit 5c056fdc5b474329037f2aa18401bd73033e0ce0 upstream.

After sending an authorizer (ceph_x_authorize_a + ceph_x_authorize_b),
the client gets back a ceph_x_authorize_reply, which it is supposed to
verify to ensure the authenticity and protect against replay attacks.
The code for doing this is there (ceph_x_verify_authorizer_reply(),
ceph_auth_verify_authorizer_reply() + plumbing), but it is never
invoked by the the messenger.

AFAICT this goes back to 2009, when ceph authentication protocols
support was added to the kernel client in 4e7a5dcd1bba ("ceph:
negotiate authentication protocol; implement AUTH_NONE protocol").

The second param of ceph_connection_operations::verify_authorizer_reply
is unused all the way down.  Pass 0 to facilitate backporting, and kill
it in the next commit.

Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Sage Weil <sage@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/ceph/messenger.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1977,6 +1977,19 @@ static int process_connect(struct ceph_c

 	dout("process_connect on %p tag %d\n", con, (int)con->in_tag);

+	if (con->auth_reply_buf) {
+		/*
+		 * Any connection that defines ->get_authorizer()
+		 * should also define ->verify_authorizer_reply().
+		 * See get_connect_authorizer().
+		 */
+		ret = con->ops->verify_authorizer_reply(con, 0);
+		if (ret < 0) {
+			con->error_msg = "bad authorize reply";
+			return ret;
+		}
+	}
+
 	switch (con->in_reply.tag) {
 	case CEPH_MSGR_TAG_FEATURES:
 		pr_err("%s%lld %s feature set mismatch,"