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1/* $OpenBSD: monitor.h,v 1.27 2026/02/09 21:23:35 dtucker Exp $ */
2
3/*
4 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef _MONITOR_H_
29#define _MONITOR_H_
30
31/* Please keep *_REQ_* values on even numbers and *_ANS_* on odd numbers */
32enum monitor_reqtype {
33 MONITOR_REQ_MODULI = 0, MONITOR_ANS_MODULI = 1,
34 MONITOR_REQ_FREE = 2,
35 MONITOR_REQ_AUTHSERV = 4,
36 MONITOR_REQ_SIGN = 6, MONITOR_ANS_SIGN = 7,
37 MONITOR_REQ_PWNAM = 8, MONITOR_ANS_PWNAM = 9,
38 MONITOR_REQ_AUTH2_READ_BANNER = 10, MONITOR_ANS_AUTH2_READ_BANNER = 11,
39 MONITOR_REQ_AUTHPASSWORD = 12, MONITOR_ANS_AUTHPASSWORD = 13,
40 MONITOR_REQ_BSDAUTHQUERY = 14, MONITOR_ANS_BSDAUTHQUERY = 15,
41 MONITOR_REQ_BSDAUTHRESPOND = 16, MONITOR_ANS_BSDAUTHRESPOND = 17,
42 MONITOR_REQ_KEYALLOWED = 22, MONITOR_ANS_KEYALLOWED = 23,
43 MONITOR_REQ_KEYVERIFY = 24, MONITOR_ANS_KEYVERIFY = 25,
44 MONITOR_REQ_KEYEXPORT = 26,
45 MONITOR_REQ_PTY = 28, MONITOR_ANS_PTY = 29,
46 MONITOR_REQ_PTYCLEANUP = 30,
47 MONITOR_REQ_SESSKEY = 32, MONITOR_ANS_SESSKEY = 33,
48 MONITOR_REQ_SESSID = 34,
49 MONITOR_REQ_RSAKEYALLOWED = 36, MONITOR_ANS_RSAKEYALLOWED = 37,
50 MONITOR_REQ_RSACHALLENGE = 38, MONITOR_ANS_RSACHALLENGE = 39,
51 MONITOR_REQ_RSARESPONSE = 40, MONITOR_ANS_RSARESPONSE = 41,
52 MONITOR_REQ_GSSSETUP = 42, MONITOR_ANS_GSSSETUP = 43,
53 MONITOR_REQ_GSSSTEP = 44, MONITOR_ANS_GSSSTEP = 45,
54 MONITOR_REQ_GSSUSEROK = 46, MONITOR_ANS_GSSUSEROK = 47,
55 MONITOR_REQ_GSSCHECKMIC = 48, MONITOR_ANS_GSSCHECKMIC = 49,
56 MONITOR_REQ_TERM = 50,
57 MONITOR_REQ_STATE = 51, MONITOR_ANS_STATE = 52
58};
59
60struct ssh;
61struct sshbuf;
62
63struct monitor {
64 int m_recvfd;
65 int m_sendfd;
66 int m_log_recvfd;
67 int m_log_sendfd;
68 struct kex **m_pkex;
69 pid_t m_pid;
70};
71
72struct monitor *monitor_init(void);
73void monitor_reinit(struct monitor *);
74
75struct Authctxt;
76void monitor_child_preauth(struct ssh *, struct monitor *);
77void monitor_child_postauth(struct ssh *, struct monitor *);
78
79void monitor_clear_keystate(struct ssh *, struct monitor *);
80void monitor_apply_keystate(struct ssh *, struct monitor *);
81
82int monitor_auth_attempted(void);
83int monitor_invalid_user(void);
84
85/* Prototypes for request sending and receiving */
86void mm_request_send(int, enum monitor_reqtype, struct sshbuf *);
87void mm_request_receive(int, struct sshbuf *);
88void mm_request_receive_expect(int, enum monitor_reqtype, struct sshbuf *);
89void mm_get_keystate(struct ssh *, struct monitor *);
90
91/* XXX: should be returned via a monitor call rather than config_fd */
92void mm_encode_server_options(struct sshbuf *);
93
94struct sshbuf *pack_hostkeys(void);
95
96#endif /* _MONITOR_H_ */