1/*
2 * Dropbear - a SSH2 server
3 *
4 * Copyright (c) 2002,2003 Matt Johnston
5 * All rights reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE. */
24
25#ifndef _AUTH_H_
26#define _AUTH_H_
27
28#include "includes.h"
29
30void svr_authinitialise();
31void cli_authinitialise();
32
33/* Server functions */
34void recv_msg_userauth_request();
35void send_msg_userauth_failure(int partial, int incrfail);
36void send_msg_userauth_success();
37void svr_auth_password();
38void svr_auth_pubkey();
39void svr_auth_pam();
40
41/* Client functions */
42void recv_msg_userauth_failure();
43void recv_msg_userauth_success();
44void recv_msg_userauth_specific_60();
45void recv_msg_userauth_pk_ok();
46void recv_msg_userauth_info_request();
47void cli_get_user();
48void cli_auth_getmethods();
49void cli_auth_try();
50void recv_msg_userauth_banner();
51void cli_pubkeyfail();
52void cli_auth_password();
53int cli_auth_pubkey();
54void cli_auth_interactive();
55char* getpass_or_cancel(char* prompt);
56
57
58#define MAX_USERNAME_LEN 25 /* arbitrary for the moment */
59
60#define AUTH_TYPE_NONE      1
61#define AUTH_TYPE_PUBKEY    1 << 1
62#define AUTH_TYPE_PASSWORD  1 << 2
63#define AUTH_TYPE_INTERACT  1 << 3
64
65#define AUTH_METHOD_NONE "none"
66#define AUTH_METHOD_NONE_LEN 4
67#define AUTH_METHOD_PUBKEY "publickey"
68#define AUTH_METHOD_PUBKEY_LEN 9
69#define AUTH_METHOD_PASSWORD "password"
70#define AUTH_METHOD_PASSWORD_LEN 8
71#define AUTH_METHOD_INTERACT "keyboard-interactive"
72#define AUTH_METHOD_INTERACT_LEN 20
73
74
75
76/* This structure is shared between server and client - it contains
77 * relatively little extraneous bits when used for the client rather than the
78 * server */
79struct AuthState {
80
81	char *username; /* This is the username the client presents to check. It
82					   is updated each run through, used for auth checking */
83	unsigned char authtypes; /* Flags indicating which auth types are still
84								valid */
85	unsigned int failcount; /* Number of (failed) authentication attempts.*/
86	unsigned authdone : 1; /* 0 if we haven't authed, 1 if we have. Applies for
87							  client and server (though has differing [obvious]
88							  meanings). */
89	unsigned perm_warn : 1; /* Server only, set if bad permissions on
90							   ~/.ssh/authorized_keys have already been
91							   logged. */
92
93	/* These are only used for the server */
94	char *printableuser; /* stripped of control chars, used for logs etc */
95	struct passwd * pw;
96
97};
98
99struct SignKeyList;
100/* A singly linked list of signing keys */
101struct SignKeyList {
102
103	sign_key *key;
104	int type; /* The type of key */
105	struct SignKeyList *next;
106	/* filename? or the buffer? for encrypted keys, so we can later get
107	 * the private key portion */
108
109};
110
111#endif /* _AUTH_H_ */
112