1 /* $OpenBSD: auth.h,v 1.49 2004/01/30 09:48:57 markus Exp $ */
4 * Copyright (c) 2000 Markus Friedl. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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.
33 #include <openssl/rsa.h>
36 #include <login_cap.h>
48 typedef struct Authctxt Authctxt;
49 typedef struct Authmethod Authmethod;
50 typedef struct KbdintDevice KbdintDevice;
54 int postponed; /* authentication needs another step */
55 int valid; /* user exists and is allowed to login */
59 char *user; /* username sent by the client */
61 struct passwd *pw; /* set if 'valid' */
68 krb5_context krb5_ctx;
69 krb5_ccache krb5_fwd_ccache;
70 krb5_principal krb5_user;
71 char *krb5_ticket_file;
74 char *session_env_file;
79 * Every authentication method has to handle authentication requests for
80 * non-existing users, or for users that are not allowed to login. In this
81 * case 'valid' is set to 0, but 'user' points to the username requested by
87 int (*userauth)(Authctxt *authctxt);
92 * Keyboard interactive device:
93 * init_ctx returns: non NULL upon success
94 * query returns: 0 - success, otherwise failure
95 * respond returns: 0 - success, 1 - need further interaction,
101 void* (*init_ctx)(Authctxt*);
102 int (*query)(void *ctx, char **name, char **infotxt,
103 u_int *numprompts, char ***prompts, u_int **echo_on);
104 int (*respond)(void *ctx, u_int numresp, char **responses);
105 void (*free_ctx)(void *ctx);
108 int auth_rhosts(struct passwd *, const char *);
110 auth_rhosts2(struct passwd *, const char *, const char *, const char *);
112 int auth_rhosts_rsa(Authctxt *, char *, Key *);
113 int auth_password(Authctxt *, const char *);
114 int auth_rsa(Authctxt *, BIGNUM *);
115 int auth_rsa_challenge_dialog(Key *);
116 BIGNUM *auth_rsa_generate_challenge(Key *);
117 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
118 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
120 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
121 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
122 int user_key_allowed(struct passwd *, Key *);
125 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
126 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
127 int auth_krb5_password(Authctxt *authctxt, const char *password);
128 void krb5_cleanup_proc(Authctxt *authctxt);
131 #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
133 int auth_shadow_acctexpired(struct spwd *);
134 int auth_shadow_pwexpired(Authctxt *);
137 #include "auth-pam.h"
138 void disable_forwarding(void);
140 void do_authentication(Authctxt *);
141 void do_authentication2(Authctxt *);
143 void auth_log(Authctxt *, int, char *, char *);
144 void userauth_finish(Authctxt *, int, char *);
145 int auth_root_allowed(char *);
147 char *auth2_read_banner(void);
149 void privsep_challenge_enable(void);
151 int auth2_challenge(Authctxt *, char *);
152 void auth2_challenge_stop(Authctxt *);
153 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
154 int bsdauth_respond(void *, u_int, char **);
155 int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
156 int skey_respond(void *, u_int, char **);
158 int allowed_user(struct passwd *);
159 struct passwd * getpwnamallow(const char *user);
161 char *get_challenge(Authctxt *);
162 int verify_response(Authctxt *, const char *);
163 void abandon_challenge_response(Authctxt *);
165 char *expand_filename(const char *, struct passwd *);
166 char *authorized_keys_file(struct passwd *);
167 char *authorized_keys_file2(struct passwd *);
170 secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
173 check_key_in_hostfiles(struct passwd *, Key *, const char *,
174 const char *, const char *);
176 /* hostkey handling */
177 Key *get_hostkey_by_index(int);
178 Key *get_hostkey_by_type(int);
179 int get_hostkey_index(Key *);
180 int ssh1_session_key(BIGNUM *);
182 /* debug messages during authentication */
183 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
184 void auth_debug_send(void);
185 void auth_debug_reset(void);
187 struct passwd *fakepw(void);
189 #define AUTH_FAIL_MAX 6
190 #define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
191 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
193 #define SKEY_PROMPT "\nS/Key Password: "