1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $OpenBSD: auth.h,v 1.18 2001/06/23 00:20:58 markus Exp $
*/
#ifndef AUTH_H
#define AUTH_H
#include "key.h"
#include "hostfile.h"
#include <openssl/rsa.h>
#ifdef HAVE_LOGIN_CAP
#include <login_cap.h>
#endif
#ifdef BSD_AUTH
#include <bsd_auth.h>
#endif
typedef struct Authctxt Authctxt;
typedef struct KbdintDevice KbdintDevice;
struct Authctxt {
int success;
int postponed;
int valid;
int attempt;
int failures;
char *user;
char *service;
struct passwd *pw;
char *style;
void *kbdintctxt;
#ifdef BSD_AUTH
auth_session_t *as;
#endif
};
/*
* Keyboard interactive device:
* init_ctx returns: non NULL upon success
* query returns: 0 - success, otherwise failure
* respond returns: 0 - success, 1 - need further interaction,
* otherwise - failure
*/
struct KbdintDevice
{
const char *name;
void* (*init_ctx) __P((Authctxt*));
int (*query) __P((void *ctx, char **name, char **infotxt,
u_int *numprompts, char ***prompts,
u_int **echo_on));
int (*respond) __P((void *ctx, u_int numresp, char **responses));
void (*free_ctx) __P((void *ctx));
};
/*
* Tries to authenticate the user using the .rhosts file. Returns true if
* authentication succeeds. If ignore_rhosts is non-zero, this will not
* consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
*/
int auth_rhosts(struct passwd * pw, const char *client_user);
/* extended interface similar to auth_rhosts() */
int
auth_rhosts2(struct passwd *pw, const char *client_user, const char *hostname,
const char *ipaddr);
/*
* Tries to authenticate the user using the .rhosts file and the host using
* its host key. Returns true if authentication succeeds.
*/
int
auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key);
/*
* Tries to authenticate the user using password. Returns true if
* authentication succeeds.
*/
int auth_password(Authctxt *authctxt, const char *password);
/*
* Performs the RSA authentication dialog with the client. This returns 0 if
* the client could not be authenticated, and 1 if authentication was
* successful. This may exit if there is a serious protocol violation.
*/
int auth_rsa(struct passwd * pw, BIGNUM * client_n);
/*
* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
* over the key. Skips any whitespace at the beginning and at end.
*/
int auth_rsa_read_key(char **cpp, u_int *bitsp, BIGNUM * e, BIGNUM * n);
/*
* Performs the RSA authentication challenge-response dialog with the client,
* and returns true (non-zero) if the client gave the correct answer to our
* challenge; returns zero if the client gives a wrong answer.
*/
int auth_rsa_challenge_dialog(RSA *pk);
#ifdef KRB4
#include <krb.h>
/*
* Performs Kerberos v4 mutual authentication with the client. This returns 0
* if the client could not be authenticated, and 1 if authentication was
* successful. This may exit if there is a serious protocol violation.
*/
int auth_krb4(const char *server_user, KTEXT auth, char **client);
int krb4_init(uid_t uid);
void krb4_cleanup_proc(void *ignore);
int auth_krb4_password(struct passwd * pw, const char *password);
#ifdef AFS
#include <kafs.h>
/* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
int auth_kerberos_tgt(struct passwd * pw, const char *string);
int auth_afs_token(struct passwd * pw, const char *token_string);
#endif /* AFS */
#endif /* KRB4 */
void do_authentication(void);
void do_authentication2(void);
Authctxt *authctxt_new(void);
void auth_log(Authctxt *authctxt, int authenticated, char *method, char *info);
void userauth_finish(Authctxt *authctxt, int authenticated, char *method);
int auth_root_allowed(char *method);
int auth2_challenge(Authctxt *authctxt, char *devs);
int allowed_user(struct passwd * pw);
char *get_challenge(Authctxt *authctxt);
int verify_response(Authctxt *authctxt, const char *response);
struct passwd * auth_get_user(void);
/* expand a filename - return buffer is allocated by xmalloc */
char *expand_filename(const char *template, struct passwd *pw);
char *authorized_keys_file(struct passwd *pw);
char *authorized_keys_file2(struct passwd *pw);
/* check a file and the path to it */
int
secure_filename(FILE *f, const char *file, uid_t u, char *err, size_t errlen);
/* helper for hostbased auth */
HostStatus
check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host,
const char *sysfile, const char *userfile);
#define AUTH_FAIL_MAX 6
#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
#endif
|
