1 /* $OpenBSD: auth.h,v 1.88 2016/05/04 14:04:40 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 authenticated
; /* authenticated and alarms cancelled */
55 int postponed
; /* authentication needs another step */
56 int valid
; /* user exists and is allowed to login */
59 int server_caused_failure
;
61 char *user
; /* username sent by the client */
63 struct passwd
*pw
; /* set if 'valid' */
66 char *info
; /* Extra info for next auth_log */
70 char **auth_methods
; /* modified from server config */
71 u_int num_auth_methods
;
73 krb5_context krb5_ctx
;
74 krb5_ccache krb5_fwd_ccache
;
75 krb5_principal krb5_user
;
76 char *krb5_ticket_file
;
82 struct sshkey
**prev_userkeys
;
86 * Every authentication method has to handle authentication requests for
87 * non-existing users, or for users that are not allowed to login. In this
88 * case 'valid' is set to 0, but 'user' points to the username requested by
94 int (*userauth
)(Authctxt
*authctxt
);
99 * Keyboard interactive device:
100 * init_ctx returns: non NULL upon success
101 * query returns: 0 - success, otherwise failure
102 * respond returns: 0 - success, 1 - need further interaction,
103 * otherwise - failure
108 void* (*init_ctx
)(Authctxt
*);
109 int (*query
)(void *ctx
, char **name
, char **infotxt
,
110 u_int
*numprompts
, char ***prompts
, u_int
**echo_on
);
111 int (*respond
)(void *ctx
, u_int numresp
, char **responses
);
112 void (*free_ctx
)(void *ctx
);
115 int auth_rhosts(struct passwd
*, const char *);
117 auth_rhosts2(struct passwd
*, const char *, const char *, const char *);
119 int auth_rhosts_rsa(Authctxt
*, char *, Key
*);
120 int auth_password(Authctxt
*, const char *);
121 int auth_rsa(Authctxt
*, BIGNUM
*);
122 int auth_rsa_challenge_dialog(Key
*);
123 BIGNUM
*auth_rsa_generate_challenge(Key
*);
124 int auth_rsa_verify_response(Key
*, BIGNUM
*, u_char
[]);
125 int auth_rsa_key_allowed(struct passwd
*, BIGNUM
*, Key
**);
127 int auth_rhosts_rsa_key_allowed(struct passwd
*, const char *,
128 const char *, Key
*);
129 int hostbased_key_allowed(struct passwd
*, const char *, char *, Key
*);
130 int user_key_allowed(struct passwd
*, Key
*, int);
131 void pubkey_auth_info(Authctxt
*, const Key
*, const char *, ...)
132 __attribute__((__format__ (printf
, 3, 4)));
133 void auth2_record_userkey(Authctxt
*, struct sshkey
*);
134 int auth2_userkey_already_used(Authctxt
*, struct sshkey
*);
137 int auth_secure_path(const char *, struct stat
*, const char *, uid_t
,
141 int auth_krb5(Authctxt
*authctxt
, krb5_data
*auth
, char **client
, krb5_data
*);
142 int auth_krb5_tgt(Authctxt
*authctxt
, krb5_data
*tgt
);
143 int auth_krb5_password(Authctxt
*authctxt
, const char *password
);
144 void krb5_cleanup_proc(Authctxt
*authctxt
);
147 #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
149 int auth_shadow_acctexpired(struct spwd
*);
150 int auth_shadow_pwexpired(Authctxt
*);
153 #include "auth-pam.h"
155 void remove_kbdint_device(const char *);
157 void disable_forwarding(void);
159 void do_authentication(Authctxt
*);
160 void do_authentication2(Authctxt
*);
162 void auth_info(Authctxt
*authctxt
, const char *, ...)
163 __attribute__((__format__ (printf
, 2, 3)))
164 __attribute__((__nonnull__ (2)));
165 void auth_log(Authctxt
*, int, int, const char *, const char *);
166 void auth_maxtries_exceeded(Authctxt
*) __attribute__((noreturn
));
167 void userauth_finish(Authctxt
*, int, const char *, const char *);
168 int auth_root_allowed(const char *);
170 void userauth_send_banner(const char *);
172 char *auth2_read_banner(void);
173 int auth2_methods_valid(const char *, int);
174 int auth2_update_methods_lists(Authctxt
*, const char *, const char *);
175 int auth2_setup_methods_lists(Authctxt
*);
176 int auth2_method_allowed(Authctxt
*, const char *, const char *);
178 void privsep_challenge_enable(void);
180 int auth2_challenge(Authctxt
*, char *);
181 void auth2_challenge_stop(Authctxt
*);
182 int bsdauth_query(void *, char **, char **, u_int
*, char ***, u_int
**);
183 int bsdauth_respond(void *, u_int
, char **);
184 int skey_query(void *, char **, char **, u_int
*, char ***, u_int
**);
185 int skey_respond(void *, u_int
, char **);
187 int allowed_user(struct passwd
*);
188 struct passwd
* getpwnamallow(const char *user
);
190 char *get_challenge(Authctxt
*);
191 int verify_response(Authctxt
*, const char *);
192 void abandon_challenge_response(Authctxt
*);
194 char *expand_authorized_keys(const char *, struct passwd
*pw
);
195 char *authorized_principals_file(struct passwd
*);
197 FILE *auth_openkeyfile(const char *, struct passwd
*, int);
198 FILE *auth_openprincipals(const char *, struct passwd
*, int);
199 int auth_key_is_revoked(Key
*);
201 const char *auth_get_canonical_hostname(struct ssh
*, int);
204 check_key_in_hostfiles(struct passwd
*, Key
*, const char *,
205 const char *, const char *);
207 /* hostkey handling */
208 Key
*get_hostkey_by_index(int);
209 Key
*get_hostkey_public_by_index(int, struct ssh
*);
210 Key
*get_hostkey_public_by_type(int, int, struct ssh
*);
211 Key
*get_hostkey_private_by_type(int, int, struct ssh
*);
212 int get_hostkey_index(Key
*, int, struct ssh
*);
213 int ssh1_session_key(BIGNUM
*);
214 int sshd_hostkey_sign(Key
*, Key
*, u_char
**, size_t *,
215 const u_char
*, size_t, const char *, u_int
);
217 /* debug messages during authentication */
218 void auth_debug_add(const char *fmt
,...) __attribute__((format(printf
, 1, 2)));
219 void auth_debug_send(void);
220 void auth_debug_reset(void);
222 struct passwd
*fakepw(void);
224 int sys_auth_passwd(Authctxt
*, const char *);
226 #define SKEY_PROMPT "\nS/Key Password: "
228 #if defined(KRB5) && !defined(HEIMDAL)
230 krb5_error_code
ssh_krb5_cc_gen(krb5_context
, krb5_ccache
*);