/* $OpenBSD: auth.h,v 1.89 2016/08/13 17:47:41 markus Exp $ */
|
|
/*
|
* Copyright (c) 2000 Markus Friedl. All rights reserved.
|
*
|
* Redistribution and use in source and binary forms, with or without
|
* modification, are permitted provided that the following conditions
|
* are met:
|
* 1. Redistributions of source code must retain the above copyright
|
* notice, this list of conditions and the following disclaimer.
|
* 2. Redistributions in binary form must reproduce the above copyright
|
* notice, this list of conditions and the following disclaimer in the
|
* documentation and/or other materials provided with the distribution.
|
*
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
*
|
*/
|
|
#ifndef AUTH_H
|
#define AUTH_H
|
|
#include <signal.h>
|
|
#include <openssl/rsa.h>
|
|
#ifdef HAVE_LOGIN_CAP
|
#include <login_cap.h>
|
#endif
|
#ifdef BSD_AUTH
|
#include <bsd_auth.h>
|
#endif
|
#ifdef KRB5
|
#include <krb5.h>
|
#endif
|
|
struct ssh;
|
struct sshkey;
|
|
typedef struct Authctxt Authctxt;
|
typedef struct Authmethod Authmethod;
|
typedef struct KbdintDevice KbdintDevice;
|
|
struct Authctxt {
|
sig_atomic_t success;
|
int authenticated; /* authenticated and alarms cancelled */
|
int postponed; /* authentication needs another step */
|
int valid; /* user exists and is allowed to login */
|
int attempt;
|
int failures;
|
int server_caused_failure;
|
int force_pwchange;
|
char *user; /* username sent by the client */
|
char *service;
|
struct passwd *pw; /* set if 'valid' */
|
char *style;
|
void *kbdintctxt;
|
char *info; /* Extra info for next auth_log */
|
#ifdef BSD_AUTH
|
auth_session_t *as;
|
#endif
|
char **auth_methods; /* modified from server config */
|
u_int num_auth_methods;
|
#ifdef KRB5
|
krb5_context krb5_ctx;
|
krb5_ccache krb5_fwd_ccache;
|
krb5_principal krb5_user;
|
char *krb5_ticket_file;
|
char *krb5_ccname;
|
#endif
|
Buffer *loginmsg;
|
void *methoddata;
|
|
struct sshkey **prev_userkeys;
|
u_int nprev_userkeys;
|
};
|
/*
|
* Every authentication method has to handle authentication requests for
|
* non-existing users, or for users that are not allowed to login. In this
|
* case 'valid' is set to 0, but 'user' points to the username requested by
|
* the client.
|
*/
|
|
struct Authmethod {
|
char *name;
|
int (*userauth)(Authctxt *authctxt);
|
int *enabled;
|
};
|
|
/*
|
* Keyboard interactive device:
|
* init_ctx returns: non NULL upon success
|
* query returns: 0 - success, otherwise failure
|
* respond returns: 0 - success, 1 - need further interaction,
|
* otherwise - failure
|
*/
|
struct KbdintDevice
|
{
|
const char *name;
|
void* (*init_ctx)(Authctxt*);
|
int (*query)(void *ctx, char **name, char **infotxt,
|
u_int *numprompts, char ***prompts, u_int **echo_on);
|
int (*respond)(void *ctx, u_int numresp, char **responses);
|
void (*free_ctx)(void *ctx);
|
};
|
|
int
|
auth_rhosts2(struct passwd *, const char *, const char *, const char *);
|
|
int auth_password(Authctxt *, const char *);
|
|
int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
|
int user_key_allowed(struct passwd *, Key *, int);
|
void pubkey_auth_info(Authctxt *, const Key *, const char *, ...)
|
__attribute__((__format__ (printf, 3, 4)));
|
void auth2_record_userkey(Authctxt *, struct sshkey *);
|
int auth2_userkey_already_used(Authctxt *, struct sshkey *);
|
|
struct stat;
|
int auth_secure_path(const char *, struct stat *, const char *, uid_t,
|
char *, size_t);
|
|
#ifdef KRB5
|
int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *);
|
int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
|
int auth_krb5_password(Authctxt *authctxt, const char *password);
|
void krb5_cleanup_proc(Authctxt *authctxt);
|
#endif /* KRB5 */
|
|
#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
|
#include <shadow.h>
|
int auth_shadow_acctexpired(struct spwd *);
|
int auth_shadow_pwexpired(Authctxt *);
|
#endif
|
|
#include "auth-pam.h"
|
#include "audit.h"
|
void remove_kbdint_device(const char *);
|
|
void disable_forwarding(void);
|
|
void do_authentication2(Authctxt *);
|
|
void auth_info(Authctxt *authctxt, const char *, ...)
|
__attribute__((__format__ (printf, 2, 3)))
|
__attribute__((__nonnull__ (2)));
|
void auth_log(Authctxt *, int, int, const char *, const char *);
|
void auth_maxtries_exceeded(Authctxt *) __attribute__((noreturn));
|
void userauth_finish(Authctxt *, int, const char *, const char *);
|
int auth_root_allowed(const char *);
|
|
void userauth_send_banner(const char *);
|
|
char *auth2_read_banner(void);
|
int auth2_methods_valid(const char *, int);
|
int auth2_update_methods_lists(Authctxt *, const char *, const char *);
|
int auth2_setup_methods_lists(Authctxt *);
|
int auth2_method_allowed(Authctxt *, const char *, const char *);
|
|
void privsep_challenge_enable(void);
|
|
int auth2_challenge(Authctxt *, char *);
|
void auth2_challenge_stop(Authctxt *);
|
int bsdauth_query(void *, char **, char **, u_int *, char ***, u_int **);
|
int bsdauth_respond(void *, u_int, char **);
|
int skey_query(void *, char **, char **, u_int *, char ***, u_int **);
|
int skey_respond(void *, u_int, char **);
|
|
int allowed_user(struct passwd *);
|
struct passwd * getpwnamallow(const char *user);
|
|
char *expand_authorized_keys(const char *, struct passwd *pw);
|
char *authorized_principals_file(struct passwd *);
|
|
FILE *auth_openkeyfile(const char *, struct passwd *, int);
|
FILE *auth_openprincipals(const char *, struct passwd *, int);
|
int auth_key_is_revoked(Key *);
|
|
const char *auth_get_canonical_hostname(struct ssh *, int);
|
|
HostStatus
|
check_key_in_hostfiles(struct passwd *, Key *, const char *,
|
const char *, const char *);
|
|
/* hostkey handling */
|
Key *get_hostkey_by_index(int);
|
Key *get_hostkey_public_by_index(int, struct ssh *);
|
Key *get_hostkey_public_by_type(int, int, struct ssh *);
|
Key *get_hostkey_private_by_type(int, int, struct ssh *);
|
int get_hostkey_index(Key *, int, struct ssh *);
|
int sshd_hostkey_sign(Key *, Key *, u_char **, size_t *,
|
const u_char *, size_t, const char *, u_int);
|
|
/* debug messages during authentication */
|
void auth_debug_add(const char *fmt,...) __attribute__((format(printf, 1, 2)));
|
void auth_debug_send(void);
|
void auth_debug_reset(void);
|
|
struct passwd *fakepw(void);
|
|
int sys_auth_passwd(Authctxt *, const char *);
|
|
#define SKEY_PROMPT "\nS/Key Password: "
|
|
#if defined(KRB5) && !defined(HEIMDAL)
|
#include <krb5.h>
|
krb5_error_code ssh_krb5_cc_gen(krb5_context, krb5_ccache *);
|
#endif
|
#endif
|
