This is a note to let you know that I've just added the patch titled
libceph: verify authorize reply on connect
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
libceph-verify-authorize-reply-on-connect.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5c056fdc5b474329037f2aa18401bd73033e0ce0 Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@xxxxxxxxx>
Date: Fri, 2 Dec 2016 16:35:09 +0100
Subject: libceph: verify authorize reply on connect
From: Ilya Dryomov <idryomov@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Sage Weil <sage@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ceph/messenger.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -2042,6 +2042,19 @@ 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,"
Patches currently in stable-queue which might be from idryomov@xxxxxxxxx are
queue-4.4/libceph-verify-authorize-reply-on-connect.patch
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