1 /* $OpenBSD: auth.h,v 1.50 2004/05/23 23:59:53 dtucker Exp $ */
5 * Copyright (c) 2000 Markus Friedl. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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.
34 #include <openssl/rsa.h>
37 #include <login_cap.h>
46 typedef struct Authctxt Authctxt;
47 typedef struct Authmethod Authmethod;
48 typedef struct KbdintDevice KbdintDevice;
52 int postponed; /* authentication needs another step */
53 int valid; /* user exists and is allowed to login */
57 char *user; /* username sent by the client */
59 struct passwd *pw; /* set if 'valid' */
66 krb5_context krb5_ctx;
67 krb5_ccache krb5_fwd_ccache;
68 krb5_principal krb5_user;
69 char *krb5_ticket_file;
75 * Every authentication method has to handle authentication requests for
76 * non-existing users, or for users that are not allowed to login. In this
77 * case 'valid' is set to 0, but 'user' points to the username requested by
83 int (*userauth)(Authctxt *authctxt);
88 * Keyboard interactive device:
89 * init_ctx returns: non NULL upon success
90 * query returns: 0 - success, otherwise failure
91 * respond returns: 0 - success, 1 - need further interaction,
97 void* (*init_ctx)(Authctxt*);
98 int (*query)(void *ctx, char **name, char **infotxt,
99 u_int *numprompts, char ***prompts, u_int **echo_on);
100 int (*respond)(void *ctx, u_int numresp, char **responses);
101 void (*free_ctx)(void *ctx);
104 int auth_rhosts(struct passwd *, const char *);
106 auth_rhosts2(struct passwd *, const char *, const char *, const char *);
108 int auth_rhosts_rsa(Authctxt *, char *, Key *);
109 int auth_password(Authctxt *, const char *);
110 int auth_rsa(Authctxt *, BIGNUM *);
111 int auth_rsa_challenge_dialog(Key *);
112 BIGNUM *auth_rsa_generate_challenge(Key *);
113 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
114 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
116 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
117 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
118 int user_key_allowed(struct passwd *, Key *);
121 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
122 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
123 int auth_krb5_password(Authctxt *authctxt, const char *password);
124 void krb5_cleanup_proc(Authctxt *authctxt);
127 #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
129 int auth_shadow_acctexpired(struct spwd *);
130 int auth_shadow_pwexpired(Authctxt *);
133 #include "auth-pam.h"
134 void disable_forwarding(void);
136 void do_authentication(Authctxt *);
137 void do_authentication2(Authctxt *);
139 void auth_log(Authctxt *, int, char *, char *);
140 void userauth_finish(Authctxt *, int, char *);
141 int auth_root_allowed(char *);
143 char *auth2_read_banner(void);
145 void privsep_challenge_enable(void);
147 int auth2_challenge(Authctxt *, char *);
148 void auth2_challenge_stop(Authctxt *);
149 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
150 int bsdauth_respond(void *, u_int, char **);
151 int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
152 int skey_respond(void *, u_int, char **);
154 int allowed_user(struct passwd *);
155 struct passwd * getpwnamallow(const char *user);
157 char *get_challenge(Authctxt *);
158 int verify_response(Authctxt *, const char *);
159 void abandon_challenge_response(Authctxt *);
161 char *expand_filename(const char *, struct passwd *);
162 char *authorized_keys_file(struct passwd *);
163 char *authorized_keys_file2(struct passwd *);
166 secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
169 check_key_in_hostfiles(struct passwd *, Key *, const char *,
170 const char *, const char *);
172 /* hostkey handling */
173 Key *get_hostkey_by_index(int);
174 Key *get_hostkey_by_type(int);
175 int get_hostkey_index(Key *);
176 int ssh1_session_key(BIGNUM *);
178 /* debug messages during authentication */
179 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
180 void auth_debug_send(void);
181 void auth_debug_reset(void);
183 struct passwd *fakepw(void);
185 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
189 #define SKEY_PROMPT "\nOPIE Password: "
191 #define SKEY_PROMPT "\nS/Key Password: "