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41b2f314 1/* $OpenBSD: auth.h,v 1.41 2002/09/26 11:38:43 markus Exp $ */
e9a17296 2
3c0ef626 3/*
4 * Copyright (c) 2000 Markus Friedl. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
3c0ef626 26 */
e9a17296 27
3c0ef626 28#ifndef AUTH_H
29#define AUTH_H
30
31#include "key.h"
32#include "hostfile.h"
33#include <openssl/rsa.h>
34
35#ifdef HAVE_LOGIN_CAP
36#include <login_cap.h>
37#endif
38#ifdef BSD_AUTH
39#include <bsd_auth.h>
40#endif
41#ifdef KRB5
42#include <krb5.h>
43#endif
44
45typedef struct Authctxt Authctxt;
f5799ae1 46typedef struct Authmethod Authmethod;
3c0ef626 47typedef struct KbdintDevice KbdintDevice;
48
49struct Authctxt {
50 int success;
51 int postponed;
52 int valid;
53 int attempt;
54 int failures;
55 char *user;
56 char *service;
57 struct passwd *pw;
58 char *style;
59 void *kbdintctxt;
60#ifdef BSD_AUTH
61 auth_session_t *as;
62#endif
63#ifdef KRB4
64 char *krb4_ticket_file;
65#endif
66#ifdef KRB5
67 krb5_context krb5_ctx;
68 krb5_auth_context krb5_auth_ctx;
69 krb5_ccache krb5_fwd_ccache;
70 krb5_principal krb5_user;
71 char *krb5_ticket_file;
72#endif
73};
74
f5799ae1 75struct Authmethod {
76 char *name;
77 int (*userauth)(Authctxt *authctxt);
78 int *enabled;
79};
80
3c0ef626 81/*
82 * Keyboard interactive device:
e9a17296 83 * init_ctx returns: non NULL upon success
84 * query returns: 0 - success, otherwise failure
3c0ef626 85 * respond returns: 0 - success, 1 - need further interaction,
86 * otherwise - failure
87 */
88struct KbdintDevice
89{
90 const char *name;
e9a17296 91 void* (*init_ctx)(Authctxt*);
92 int (*query)(void *ctx, char **name, char **infotxt,
93 u_int *numprompts, char ***prompts, u_int **echo_on);
94 int (*respond)(void *ctx, u_int numresp, char **responses);
95 void (*free_ctx)(void *ctx);
3c0ef626 96};
97
700318f3 98int auth_rhosts(struct passwd *, const char *);
3c0ef626 99int
100auth_rhosts2(struct passwd *, const char *, const char *, const char *);
101
700318f3 102int auth_rhosts_rsa(struct passwd *, char *, Key *);
3c0ef626 103int auth_password(Authctxt *, const char *);
104int auth_rsa(struct passwd *, BIGNUM *);
700318f3 105int auth_rsa_challenge_dialog(Key *);
106BIGNUM *auth_rsa_generate_challenge(Key *);
107int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
108int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
109
110int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
111int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
112int user_key_allowed(struct passwd *, Key *);
3c0ef626 113
114#ifdef KRB4
115#include <krb.h>
41b2f314 116int auth_krb4(Authctxt *, KTEXT, char **, KTEXT);
3c0ef626 117int auth_krb4_password(Authctxt *, const char *);
118void krb4_cleanup_proc(void *);
119
120#ifdef AFS
121#include <kafs.h>
122int auth_krb4_tgt(Authctxt *, const char *);
123int auth_afs_token(Authctxt *, const char *);
124#endif /* AFS */
125
126#endif /* KRB4 */
127
128#ifdef KRB5
41b2f314 129int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
3c0ef626 130int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
131int auth_krb5_password(Authctxt *authctxt, const char *password);
132void krb5_cleanup_proc(void *authctxt);
133#endif /* KRB5 */
134
135#include "auth-pam.h"
136#include "auth2-pam.h"
137
700318f3 138Authctxt *do_authentication(void);
139Authctxt *do_authentication2(void);
3c0ef626 140
141Authctxt *authctxt_new(void);
142void auth_log(Authctxt *, int, char *, char *);
143void userauth_finish(Authctxt *, int, char *);
144int auth_root_allowed(char *);
145
700318f3 146char *auth2_read_banner(void);
147
148void privsep_challenge_enable(void);
149
3c0ef626 150int auth2_challenge(Authctxt *, char *);
e9a17296 151void auth2_challenge_stop(Authctxt *);
700318f3 152int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
153int bsdauth_respond(void *, u_int, char **);
154int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
155int skey_respond(void *, u_int, char **);
3c0ef626 156
157int allowed_user(struct passwd *);
700318f3 158struct passwd * getpwnamallow(const char *user);
3c0ef626 159
160char *get_challenge(Authctxt *);
161int verify_response(Authctxt *, const char *);
162
163struct passwd * auth_get_user(void);
164
165char *expand_filename(const char *, struct passwd *);
166char *authorized_keys_file(struct passwd *);
167char *authorized_keys_file2(struct passwd *);
168
169int
170secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
171
172HostStatus
173check_key_in_hostfiles(struct passwd *, Key *, const char *,
174 const char *, const char *);
175
700318f3 176/* hostkey handling */
177Key *get_hostkey_by_index(int);
178Key *get_hostkey_by_type(int);
179int get_hostkey_index(Key *);
180int ssh1_session_key(BIGNUM *);
181
182/* debug messages during authentication */
183void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
184void auth_debug_send(void);
185void auth_debug_reset(void);
186
3c0ef626 187#define AUTH_FAIL_MAX 6
188#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
189#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
190
700318f3 191#define SKEY_PROMPT "\nS/Key Password: "
3c0ef626 192#endif
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