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Problem: gssapi_mechanism_base_t aborts the application when it receives a message it cannot decode

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Solution: emit an ZMQ_EVENT_HANDSHAKE_FAILED_PROTOCOL event instead of using zmq_assert
This commit is contained in:
sigiesec 2017-08-18 12:01:06 +02:00
parent 31c72e22ab
commit 898691e2eb
1 changed files with 12 additions and 6 deletions
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18
src/gssapi_mechanism_base.cpp
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@ -181,12 +181,18 @@ int zmq::gssapi_mechanism_base_t::decode_message (msg_t *msg_)
maj_stat = gss_unwrap(&min_stat, context, &wrapped, &plaintext,
&state, (gss_qop_t *) NULL);
// TODO I don't think it is a good idea to use zmq_assert here. If
// decryption fails, gss_unwrap returns GSS_S_BAD_SIG. This opens up
// to DoS attacks by clients! Instead, a
// ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC event should be emitted.
zmq_assert(maj_stat == GSS_S_COMPLETE);
if (maj_stat != GSS_S_COMPLETE)
{
// TODO is it correct to release the plaintext buffer if gss_unwrap
// did not succeed?
gss_release_buffer (&min_stat, &plaintext);
free (wrapped);
session->get_socket ()->event_handshake_failed_protocol (
session->get_endpoint (),
ZMQ_PROTOCOL_ERROR_ZMTP_CRYPTOGRAPHIC);
errno = EPROTO;
return -1;
}
zmq_assert(state);
// Re-initialize msg_ for plaintext