1 /* $OpenBSD: auth.h,v 1.77 2014/01/29 06:18:35 djm 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>
45 typedef struct Authctxt Authctxt;
46 typedef struct Authmethod Authmethod;
47 typedef struct KbdintDevice KbdintDevice;
51 int authenticated; /* authenticated and alarms cancelled */
52 int postponed; /* authentication needs another step */
53 int valid; /* user exists and is allowed to login */
56 int server_caused_failure;
58 char *user; /* username sent by the client */
60 struct passwd *pw; /* set if 'valid' */
63 char *info; /* Extra info for next auth_log */
67 char **auth_methods; /* modified from server config */
68 u_int num_auth_methods;
70 krb5_context krb5_ctx;
71 krb5_ccache krb5_fwd_ccache;
72 krb5_principal krb5_user;
73 char *krb5_ticket_file;
80 * Every authentication method has to handle authentication requests for
81 * non-existing users, or for users that are not allowed to login. In this
82 * case 'valid' is set to 0, but 'user' points to the username requested by
88 int (*userauth)(Authctxt *authctxt);
93 * Keyboard interactive device:
94 * init_ctx returns: non NULL upon success
95 * query returns: 0 - success, otherwise failure
96 * respond returns: 0 - success, 1 - need further interaction,
102 void* (*init_ctx)(Authctxt*);
103 int (*query)(void *ctx, char **name, char **infotxt,
104 u_int *numprompts, char ***prompts, u_int **echo_on);
105 int (*respond)(void *ctx, u_int numresp, char **responses);
106 void (*free_ctx)(void *ctx);
109 int auth_rhosts(struct passwd *, const char *);
111 auth_rhosts2(struct passwd *, const char *, const char *, const char *);
113 int auth_rhosts_rsa(Authctxt *, char *, Key *);
114 int auth_password(Authctxt *, const char *);
115 int auth_rsa(Authctxt *, BIGNUM *);
116 int auth_rsa_challenge_dialog(Key *);
117 BIGNUM *auth_rsa_generate_challenge(Key *);
118 int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
119 int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
121 int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
122 int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
123 int user_key_allowed(struct passwd *, Key *);
124 void pubkey_auth_info(Authctxt *, const Key *, const char *, ...)
125 __attribute__((__format__ (printf, 3, 4)));
128 int auth_secure_path(const char *, struct stat *, const char *, uid_t,
132 int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
133 int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
134 int auth_krb5_password(Authctxt *authctxt, const char *password);
135 void krb5_cleanup_proc(Authctxt *authctxt);
138 #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
140 int auth_shadow_acctexpired(struct spwd *);
141 int auth_shadow_pwexpired(Authctxt *);
144 #include "auth-pam.h"
146 void remove_kbdint_device(const char *);
148 void disable_forwarding(void);
150 void do_authentication(Authctxt *);
151 void do_authentication2(Authctxt *);
153 void auth_info(Authctxt *authctxt, const char *, ...)
154 __attribute__((__format__ (printf, 2, 3)))
155 __attribute__((__nonnull__ (2)));
156 void auth_log(Authctxt *, int, int, const char *, const char *);
157 void userauth_finish(Authctxt *, int, const char *, const char *);
158 int auth_root_allowed(const char *);
160 void userauth_send_banner(const char *);
162 char *auth2_read_banner(void);
163 int auth2_methods_valid(const char *, int);
164 int auth2_update_methods_lists(Authctxt *, const char *, const char *);
165 int auth2_setup_methods_lists(Authctxt *);
166 int auth2_method_allowed(Authctxt *, const char *, const char *);
168 void privsep_challenge_enable(void);
170 int auth2_challenge(Authctxt *, char *);
171 void auth2_challenge_stop(Authctxt *);
172 int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
173 int bsdauth_respond(void *, u_int, char **);
174 int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
175 int skey_respond(void *, u_int, char **);
177 int allowed_user(struct passwd *);
178 struct passwd * getpwnamallow(const char *user);
180 char *get_challenge(Authctxt *);
181 int verify_response(Authctxt *, const char *);
182 void abandon_challenge_response(Authctxt *);
184 char *expand_authorized_keys(const char *, struct passwd *pw);
185 char *authorized_principals_file(struct passwd *);
187 FILE *auth_openkeyfile(const char *, struct passwd *, int);
188 FILE *auth_openprincipals(const char *, struct passwd *, int);
189 int auth_key_is_revoked(Key *);
192 check_key_in_hostfiles(struct passwd *, Key *, const char *,
193 const char *, const char *);
195 /* hostkey handling */
196 Key *get_hostkey_by_index(int);
197 Key *get_hostkey_public_by_index(int);
198 Key *get_hostkey_public_by_type(int);
199 Key *get_hostkey_private_by_type(int);
200 int get_hostkey_index(Key *);
201 int ssh1_session_key(BIGNUM *);
202 void sshd_hostkey_sign(Key *, Key *, u_char **, u_int *, u_char *, u_int);
204 /* debug messages during authentication */
205 void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
206 void auth_debug_send(void);
207 void auth_debug_reset(void);
209 struct passwd *fakepw(void);
211 int sys_auth_passwd(Authctxt *, const char *);
213 #define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
215 #define SKEY_PROMPT "\nS/Key Password: "
217 #if defined(KRB5) && !defined(HEIMDAL)
219 krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *);