libceph: handle an empty authorize reply
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: 5c056fdc5b
("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>
This commit is contained in:
parent
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@ -2058,6 +2058,8 @@ static int process_connect(struct ceph_connection *con)
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dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
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if (con->auth) {
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int len = le32_to_cpu(con->in_reply.authorizer_len);
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/*
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* Any connection that defines ->get_authorizer()
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* should also define ->add_authorizer_challenge() and
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@ -2067,8 +2069,7 @@ static int process_connect(struct ceph_connection *con)
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*/
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if (con->in_reply.tag == CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER) {
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ret = con->ops->add_authorizer_challenge(
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con, con->auth->authorizer_reply_buf,
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le32_to_cpu(con->in_reply.authorizer_len));
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con, con->auth->authorizer_reply_buf, len);
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if (ret < 0)
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return ret;
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@ -2078,10 +2079,12 @@ static int process_connect(struct ceph_connection *con)
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return 0;
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}
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ret = con->ops->verify_authorizer_reply(con);
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if (ret < 0) {
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con->error_msg = "bad authorize reply";
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return ret;
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if (len) {
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ret = con->ops->verify_authorizer_reply(con);
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if (ret < 0) {
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con->error_msg = "bad authorize reply";
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return ret;
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}
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}
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}
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