auth.h revision 76260 
1/*
2 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 *
24 * $OpenBSD: auth.h,v 1.15 2001/04/12 19:15:24 markus Exp $
25 */
26#ifndef AUTH_H
27#define AUTH_H
28
29#include <openssl/rsa.h>
30
31#ifdef HAVE_LOGIN_CAP
32#include <login_cap.h>
33#endif
34#ifdef BSD_AUTH
35#include <bsd_auth.h>
36#endif
37
38typedef struct Authctxt Authctxt;
39struct Authctxt {
40	int success;
41	int postponed;
42	int valid;
43	int attempt;
44	int failures;
45	char *user;
46	char *service;
47	struct passwd *pw;
48	char *style;
49#ifdef BSD_AUTH
50	auth_session_t *as;
51#endif
52};
53
54/*
55 * Tries to authenticate the user using the .rhosts file.  Returns true if
56 * authentication succeeds.  If ignore_rhosts is non-zero, this will not
57 * consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
58 */
59int     auth_rhosts(struct passwd * pw, const char *client_user);
60
61/* extended interface similar to auth_rhosts() */
62int
63auth_rhosts2(struct passwd *pw, const char *client_user, const char *hostname,
64    const char *ipaddr);
65
66/*
67 * Tries to authenticate the user using the .rhosts file and the host using
68 * its host key.  Returns true if authentication succeeds.
69 */
70int
71auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key);
72
73/*
74 * Tries to authenticate the user using password.  Returns true if
75 * authentication succeeds.
76 */
77int     auth_password(Authctxt *authctxt, const char *password);
78
79/*
80 * Performs the RSA authentication dialog with the client.  This returns 0 if
81 * the client could not be authenticated, and 1 if authentication was
82 * successful.  This may exit if there is a serious protocol violation.
83 */
84int     auth_rsa(struct passwd * pw, BIGNUM * client_n);
85
86/*
87 * Parses an RSA key (number of bits, e, n) from a string.  Moves the pointer
88 * over the key.  Skips any whitespace at the beginning and at end.
89 */
90int     auth_rsa_read_key(char **cpp, u_int *bitsp, BIGNUM * e, BIGNUM * n);
91
92/*
93 * Performs the RSA authentication challenge-response dialog with the client,
94 * and returns true (non-zero) if the client gave the correct answer to our
95 * challenge; returns zero if the client gives a wrong answer.
96 */
97int     auth_rsa_challenge_dialog(RSA *pk);
98
99#ifdef KRB4
100#include <krb.h>
101/*
102 * Performs Kerberos v4 mutual authentication with the client. This returns 0
103 * if the client could not be authenticated, and 1 if authentication was
104 * successful.  This may exit if there is a serious protocol violation.
105 */
106int     auth_krb4(const char *server_user, KTEXT auth, char **client);
107int     krb4_init(uid_t uid);
108void    krb4_cleanup_proc(void *ignore);
109int	auth_krb4_password(struct passwd * pw, const char *password);
110
111#ifdef AFS
112#include <kafs.h>
113
114/* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
115int     auth_kerberos_tgt(struct passwd * pw, const char *string);
116int     auth_afs_token(struct passwd * pw, const char *token_string);
117#endif				/* AFS */
118
119#endif				/* KRB4 */
120
121void	do_authentication(void);
122void	do_authentication2(void);
123
124Authctxt *authctxt_new(void);
125void	auth_log(Authctxt *authctxt, int authenticated, char *method, char *info);
126void	userauth_finish(Authctxt *authctxt, int authenticated, char *method);
127int	auth_root_allowed(char *method);
128
129int	auth2_challenge(Authctxt *authctxt, char *devs);
130
131int	allowed_user(struct passwd * pw);
132
133char	*get_challenge(Authctxt *authctxt, char *devs);
134int	verify_response(Authctxt *authctxt, char *response);
135
136struct passwd * auth_get_user(void);
137
138#define AUTH_FAIL_MAX 6
139#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
140#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
141
142#endif
143