Commit a1f11de4 authored Feb 05, 2019 by Ilya Dryomov Committed by Greg Kroah-Hartman Feb 27, 2019

libceph: handle an empty authorize reply

commit 0fd3fd0a9bb0b02b6435bb7070e9f7b82a23f068 upstream.

The authorize reply can be empty, for example when the ticket used to
build the authorizer is too old and TAG_BADAUTHORIZER is returned from
the service.  Calling ->verify_authorizer_reply() results in an attempt
to decrypt and validate (somewhat) random data in au->buf (most likely
the signature block from calc_signature()), which fails and ends up in
con_fault_finish() with !con->auth_retry.  The ticket isn't invalidated
and the connection is retried again and again until a new ticket is
obtained from the monitor:

  libceph: osd2 192.168.122.1:6809 bad authorize reply
  libceph: osd2 192.168.122.1:6809 bad authorize reply
  libceph: osd2 192.168.122.1:6809 bad authorize reply
  libceph: osd2 192.168.122.1:6809 bad authorize reply

Let TAG_BADAUTHORIZER handler kick in and increment con->auth_retry.

Cc: stable@vger.kernel.org
Fixes: 5c056fdc5b47 ("libceph: verify authorize reply on connect")
Link: https://tracker.ceph.com/issues/20164


Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent efbc7600

net/ceph/messenger.c

+9 −6

Original line number	Diff line number	Diff line
		@@ -2042,6 +2042,8 @@ static int process_connect(struct ceph_connection *con)
		dout("process_connect on %p tag %d\n", con, (int)con->in_tag);

		if (con->auth) {
		int len = le32_to_cpu(con->in_reply.authorizer_len);

		/*
		* Any connection that defines ->get_authorizer()
		* should also define ->add_authorizer_challenge() and
		@@ -2051,8 +2053,7 @@ static int process_connect(struct ceph_connection *con)
		*/
		if (con->in_reply.tag == CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER) {
		ret = con->ops->add_authorizer_challenge(
		con, con->auth->authorizer_reply_buf,
		le32_to_cpu(con->in_reply.authorizer_len));
		con, con->auth->authorizer_reply_buf, len);
		if (ret < 0)
		return ret;

		@@ -2062,12 +2063,14 @@ static int process_connect(struct ceph_connection *con)
		return 0;
		}

		if (len) {
		ret = con->ops->verify_authorizer_reply(con);
		if (ret < 0) {
		con->error_msg = "bad authorize reply";
		return ret;
		}
		}
		}

		switch (con->in_reply.tag) {
		case CEPH_MSGR_TAG_FEATURES: