1 /*
2     Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
3 
4     This file is part of libzmq, the ZeroMQ core engine in C++.
5 
6     libzmq is free software; you can redistribute it and/or modify it under
7     the terms of the GNU Lesser General Public License (LGPL) as published
8     by the Free Software Foundation; either version 3 of the License, or
9     (at your option) any later version.
10 
11     As a special exception, the Contributors give you permission to link
12     this library with independent modules to produce an executable,
13     regardless of the license terms of these independent modules, and to
14     copy and distribute the resulting executable under terms of your choice,
15     provided that you also meet, for each linked independent module, the
16     terms and conditions of the license of that module. An independent
17     module is a module which is not derived from or based on this library.
18     If you modify this library, you must extend this exception to your
19     version of the library.
20 
21     libzmq is distributed in the hope that it will be useful, but WITHOUT
22     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23     FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24     License for more details.
25 
26     You should have received a copy of the GNU Lesser General Public License
27     along with this program.  If not, see <http://www.gnu.org/licenses/>.
28 */
29 
30 #ifndef __ZMQ_GSSAPI_CLIENT_HPP_INCLUDED__
31 #define __ZMQ_GSSAPI_CLIENT_HPP_INCLUDED__
32 
33 #ifdef HAVE_LIBGSSAPI_KRB5
34 
35 #include "gssapi_mechanism_base.hpp"
36 
37 namespace zmq
38 {
39 class msg_t;
40 class session_base_t;
41 
42 class gssapi_client_t ZMQ_FINAL : public gssapi_mechanism_base_t
43 {
44   public:
45     gssapi_client_t (session_base_t *session_, const options_t &options_);
46     ~gssapi_client_t () ZMQ_FINAL;
47 
48     // mechanism implementation
49     int next_handshake_command (msg_t *msg_) ZMQ_FINAL;
50     int process_handshake_command (msg_t *msg_) ZMQ_FINAL;
51     int encode (msg_t *msg_) ZMQ_FINAL;
52     int decode (msg_t *msg_) ZMQ_FINAL;
53     status_t status () const ZMQ_FINAL;
54 
55   private:
56     enum state_t
57     {
58         call_next_init,
59         send_next_token,
60         recv_next_token,
61         send_ready,
62         recv_ready,
63         connected
64     };
65 
66     //  Human-readable principal name of the service we are connecting to
67     char *service_name;
68 
69     gss_OID service_name_type;
70 
71     //  Current FSM state
72     state_t state;
73 
74     //  Points to either send_tok or recv_tok
75     //  during context initialization
76     gss_buffer_desc *token_ptr;
77 
78     //  The desired underlying mechanism
79     gss_OID_set_desc mechs;
80 
81     //  True iff client considers the server authenticated
82     bool security_context_established;
83 
84     int initialize_context ();
85     int produce_next_token (msg_t *msg_);
86     int process_next_token (msg_t *msg_);
87 };
88 }
89 
90 #endif
91 
92 #endif
93