auth.h

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/*      $OpenBSD: auth.h,v 1.51 2005/06/06 11:20:36 djm 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 "key.h"
#include "hostfile.h"
#include "buffer.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

typedef struct Authctxt Authctxt;
typedef struct Authmethod Authmethod;
typedef struct KbdintDevice KbdintDevice;

struct Authctxt {
        int              success;
        int              postponed;     /* authentication needs another step */
        int              valid;         /* user exists and is allowed to login */
        int              attempt;
        int              failures;
        int              force_pwchange;
        char            *user;          /* username sent by the client */
        char            *service;
        struct passwd   *pw;            /* set if 'valid' */
        char            *style;
        void            *kbdintctxt;
#ifdef BSD_AUTH
        auth_session_t  *as;
#endif
#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;
};
/*
 * 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_rhosts(struct passwd *, const char *);
int
auth_rhosts2(struct passwd *, const char *, const char *, const char *);

int      auth_rhosts_rsa(Authctxt *, char *, Key *);
int      auth_password(Authctxt *, const char *);
int      auth_rsa(Authctxt *, BIGNUM *);
int      auth_rsa_challenge_dialog(Key *);
BIGNUM  *auth_rsa_generate_challenge(Key *);
int      auth_rsa_verify_response(Key *, BIGNUM *, u_char[]);
int      auth_rsa_key_allowed(struct passwd *, BIGNUM *, Key **);

int      auth_rhosts_rsa_key_allowed(struct passwd *, char *, char *, Key *);
int      hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
int      user_key_allowed(struct passwd *, Key *);

#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_authentication(Authctxt *);
void    do_authentication2(Authctxt *);

void    auth_log(Authctxt *, int, char *, char *);
void    userauth_finish(Authctxt *, int, char *);
void    userauth_send_banner(const char *);
int     auth_root_allowed(char *);

char    *auth2_read_banner(void);

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    *get_challenge(Authctxt *);
int     verify_response(Authctxt *, const char *);
void    abandon_challenge_response(Authctxt *);

char    *authorized_keys_file(struct passwd *);
char    *authorized_keys_file2(struct passwd *);

int
secure_filename(FILE *, const char *, struct passwd *, char *, size_t);

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_by_type(int);
int      get_hostkey_index(Key *);
int      ssh1_session_key(BIGNUM *);

/* 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 AUTH_FAIL_MSG "Too many authentication failures for %.100s"

#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

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