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Darren Tucker89413db2004-05-24 10:36:23 +10001/* $OpenBSD: auth.h,v 1.50 2004/05/23 23:59:53 dtucker Exp $ */
Ben Lindstrom05764b92002-03-05 01:53:02 +00002
Damien Millere4340be2000-09-16 13:29:08 +11003/*
4 * Copyright (c) 2000 Markus Friedl. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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.
14 *
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.
Ben Lindstrom4dccfa52000-12-28 16:40:05 +000025 *
Damien Millere4340be2000-09-16 13:29:08 +110026 */
Ben Lindstrom05764b92002-03-05 01:53:02 +000027
Damien Millerb38eff82000-04-01 11:09:21 +100028#ifndef AUTH_H
29#define AUTH_H
30
Ben Lindstrom83647ce2001-06-25 04:30:16 +000031#include "key.h"
32#include "hostfile.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000033#include <openssl/rsa.h>
34
Damien Miller60396b02001-02-18 17:01:00 +110035#ifdef HAVE_LOGIN_CAP
36#include <login_cap.h>
37#endif
38#ifdef BSD_AUTH
39#include <bsd_auth.h>
40#endif
Ben Lindstromec95ed92001-07-04 04:21:14 +000041#ifdef KRB5
42#include <krb5.h>
43#endif
Damien Miller60396b02001-02-18 17:01:00 +110044
Damien Miller874d77b2000-10-14 16:23:11 +110045typedef struct Authctxt Authctxt;
Ben Lindstrom511bb242002-06-06 20:52:37 +000046typedef struct Authmethod Authmethod;
Ben Lindstrom551ea372001-06-05 18:56:16 +000047typedef struct KbdintDevice KbdintDevice;
48
Damien Miller874d77b2000-10-14 16:23:11 +110049struct Authctxt {
Ben Lindstromec95ed92001-07-04 04:21:14 +000050 int success;
Damien Miller8ce778a2003-05-14 13:43:25 +100051 int postponed; /* authentication needs another step */
52 int valid; /* user exists and is allowed to login */
Ben Lindstromec95ed92001-07-04 04:21:14 +000053 int attempt;
54 int failures;
Darren Tucker23bc8d02004-02-06 16:24:31 +110055 int force_pwchange;
Damien Miller8ce778a2003-05-14 13:43:25 +100056 char *user; /* username sent by the client */
Ben Lindstromec95ed92001-07-04 04:21:14 +000057 char *service;
Damien Miller8ce778a2003-05-14 13:43:25 +100058 struct passwd *pw; /* set if 'valid' */
Ben Lindstromec95ed92001-07-04 04:21:14 +000059 char *style;
60 void *kbdintctxt;
Damien Miller60396b02001-02-18 17:01:00 +110061#ifdef BSD_AUTH
Ben Lindstromec95ed92001-07-04 04:21:14 +000062 auth_session_t *as;
63#endif
Ben Lindstromec95ed92001-07-04 04:21:14 +000064#ifdef KRB5
65 krb5_context krb5_ctx;
Ben Lindstromec95ed92001-07-04 04:21:14 +000066 krb5_ccache krb5_fwd_ccache;
67 krb5_principal krb5_user;
68 char *krb5_ticket_file;
Damien Miller9c870f92004-04-16 22:47:55 +100069 char *krb5_ccname;
Damien Miller60396b02001-02-18 17:01:00 +110070#endif
Darren Tucker0efd1552003-08-26 11:49:55 +100071 void *methoddata;
Damien Miller874d77b2000-10-14 16:23:11 +110072};
Damien Miller8ce778a2003-05-14 13:43:25 +100073/*
74 * Every authentication method has to handle authentication requests for
75 * non-existing users, or for users that are not allowed to login. In this
76 * case 'valid' is set to 0, but 'user' points to the username requested by
77 * the client.
78 */
Damien Miller874d77b2000-10-14 16:23:11 +110079
Ben Lindstrom511bb242002-06-06 20:52:37 +000080struct Authmethod {
81 char *name;
82 int (*userauth)(Authctxt *authctxt);
83 int *enabled;
84};
85
Ben Lindstrom226cfa02001-01-22 05:34:40 +000086/*
Ben Lindstrom551ea372001-06-05 18:56:16 +000087 * Keyboard interactive device:
Damien Miller9f0f5c62001-12-21 14:45:46 +110088 * init_ctx returns: non NULL upon success
89 * query returns: 0 - success, otherwise failure
Ben Lindstrom551ea372001-06-05 18:56:16 +000090 * respond returns: 0 - success, 1 - need further interaction,
91 * otherwise - failure
92 */
93struct KbdintDevice
94{
95 const char *name;
Damien Millerb0462112002-02-19 15:24:43 +110096 void* (*init_ctx)(Authctxt*);
Damien Millera93c6d82002-02-19 15:25:29 +110097 int (*query)(void *ctx, char **name, char **infotxt,
98 u_int *numprompts, char ***prompts, u_int **echo_on);
Damien Millerb0462112002-02-19 15:24:43 +110099 int (*respond)(void *ctx, u_int numresp, char **responses);
100 void (*free_ctx)(void *ctx);
Ben Lindstrom551ea372001-06-05 18:56:16 +0000101};
102
Ben Lindstrom08105192002-03-22 02:50:06 +0000103int auth_rhosts(struct passwd *, const char *);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000104int
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000105auth_rhosts2(struct passwd *, const char *, const char *, const char *);
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000106
Damien Miller3e3b5142003-11-17 21:13:40 +1100107int auth_rhosts_rsa(Authctxt *, char *, Key *);
Ben Lindstrom4cc240d2001-07-04 04:46:56 +0000108int auth_password(Authctxt *, const char *);
Damien Miller3e3b5142003-11-17 21:13:40 +1100109int auth_rsa(Authctxt *, BIGNUM *);
Ben Lindstrom9c8aefe2002-03-22 01:12:58 +0000110int auth_rsa_challenge_dialog(Key *);
Ben Lindstrom08105192002-03-22 02:50:06 +0000111BIGNUM *auth_rsa_generate_challenge(Key *);
112int auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
113int auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);
114
115int auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
116int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
117int user_key_allowed(struct passwd *, Key *);
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000118
Ben Lindstromec95ed92001-07-04 04:21:14 +0000119#ifdef KRB5
Damien Miller25162f22002-09-12 09:47:29 +1000120int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
Ben Lindstromec95ed92001-07-04 04:21:14 +0000121int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
122int auth_krb5_password(Authctxt *authctxt, const char *password);
Darren Tucker3e33cec2003-10-02 16:12:36 +1000123void krb5_cleanup_proc(Authctxt *authctxt);
Ben Lindstromec95ed92001-07-04 04:21:14 +0000124#endif /* KRB5 */
125
Darren Tucker15ee7482004-02-22 09:43:15 +1100126#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
Darren Tuckeraa0aeca2004-02-22 10:22:05 +1100127#include <shadow.h>
Darren Tucker15ee7482004-02-22 09:43:15 +1100128int auth_shadow_acctexpired(struct spwd *);
Darren Tucker9df3def2004-02-10 13:01:14 +1100129int auth_shadow_pwexpired(Authctxt *);
130#endif
131
Damien Millerb8481582000-12-03 11:51:51 +1100132#include "auth-pam.h"
Darren Tuckere3dba822004-02-10 12:50:19 +1100133void disable_forwarding(void);
Damien Millerb8481582000-12-03 11:51:51 +1100134
Darren Tuckerec217ad2003-11-22 12:11:06 +1100135void do_authentication(Authctxt *);
136void do_authentication2(Authctxt *);
Damien Millerefb4afe2000-04-12 18:45:05 +1000137
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000138void auth_log(Authctxt *, int, char *, char *);
139void userauth_finish(Authctxt *, int, char *);
Darren Tucker77fc29e2004-09-11 23:07:03 +1000140void userauth_send_banner(const char *);
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000141int auth_root_allowed(char *);
Damien Millerb38eff82000-04-01 11:09:21 +1000142
Damien Miller5ad9fd92002-05-13 11:07:41 +1000143char *auth2_read_banner(void);
144
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000145void privsep_challenge_enable(void);
146
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000147int auth2_challenge(Authctxt *, char *);
Damien Milleree116252001-12-21 12:42:34 +1100148void auth2_challenge_stop(Authctxt *);
Ben Lindstrom08105192002-03-22 02:50:06 +0000149int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
150int bsdauth_respond(void *, u_int, char **);
151int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
152int skey_respond(void *, u_int, char **);
Damien Miller874d77b2000-10-14 16:23:11 +1100153
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000154int allowed_user(struct passwd *);
Ben Lindstrom2ae18f42002-03-22 01:24:38 +0000155struct passwd * getpwnamallow(const char *user);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000156
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000157char *get_challenge(Authctxt *);
158int verify_response(Authctxt *, const char *);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000159void abandon_challenge_response(Authctxt *);
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000160
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000161char *expand_filename(const char *, struct passwd *);
162char *authorized_keys_file(struct passwd *);
163char *authorized_keys_file2(struct passwd *);
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000164
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000165int
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000166secure_filename(FILE *, const char *, struct passwd *, char *, size_t);
Ben Lindstrombfb3a0e2001-06-05 20:25:05 +0000167
Ben Lindstrom83647ce2001-06-25 04:30:16 +0000168HostStatus
Ben Lindstrom16ae3d02001-07-04 04:02:36 +0000169check_key_in_hostfiles(struct passwd *, Key *, const char *,
170 const char *, const char *);
Ben Lindstrom83647ce2001-06-25 04:30:16 +0000171
Ben Lindstrom08105192002-03-22 02:50:06 +0000172/* hostkey handling */
173Key *get_hostkey_by_index(int);
174Key *get_hostkey_by_type(int);
175int get_hostkey_index(Key *);
176int ssh1_session_key(BIGNUM *);
177
Ben Lindstroma574cda2002-05-15 16:16:14 +0000178/* debug messages during authentication */
179void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
180void auth_debug_send(void);
181void auth_debug_reset(void);
182
Damien Miller856f0be2003-09-03 07:32:45 +1000183struct passwd *fakepw(void);
184
Damien Millereba71ba2000-04-29 23:57:08 +1000185#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
186
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000187#define SKEY_PROMPT "\nS/Key Password: "
Damien Millerb38eff82000-04-01 11:09:21 +1000188#endif