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/*
* 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.
*
* $OpenBSD: auth.h,v 1.18 2001/06/23 00:20:58 markus Exp $
*/
#ifndef AUTH_H
#define AUTH_H
#include "key.h"
#include "hostfile.h"
#include <openssl/rsa.h>
#ifdef HAVE_LOGIN_CAP
#include <login_cap.h>
#endif
#ifdef BSD_AUTH
#include <bsd_auth.h>
#endif
typedef struct Authctxt Authctxt;
typedef struct KbdintDevice KbdintDevice;
struct Authctxt {
int success;
int postponed;
int valid;
int attempt;
int failures;
char *user;
char *service;
struct passwd *pw;
char *style;
void *kbdintctxt;
#ifdef BSD_AUTH
auth_session_t *as;
#endif
};
/*
* 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) __P((Authctxt*));
int (*query) __P((void *ctx, char **name, char **infotxt,
u_int *numprompts, char ***prompts,
u_int **echo_on));
int (*respond) __P((void *ctx, u_int numresp, char **responses));
void (*free_ctx) __P((void *ctx));
};
/*
* Tries to authenticate the user using the .rhosts file. Returns true if
* authentication succeeds. If ignore_rhosts is non-zero, this will not
* consider .rhosts and .shosts (/etc/hosts.equiv will still be used).
*/
int auth_rhosts(struct passwd * pw, const char *client_user);
/* extended interface similar to auth_rhosts() */
int
auth_rhosts2(struct passwd *pw, const char *client_user, const char *hostname,
const char *ipaddr);
/*
* Tries to authenticate the user using the .rhosts file and the host using
* its host key. Returns true if authentication succeeds.
*/
int
auth_rhosts_rsa(struct passwd * pw, const char *client_user, RSA* client_host_key);
/*
* Tries to authenticate the user using password. Returns true if
* authentication succeeds.
*/
int auth_password(Authctxt *authctxt, const char *password);
/*
* Performs the RSA authentication dialog with the client. This returns 0 if
* the client could not be authenticated, and 1 if authentication was
* successful. This may exit if there is a serious protocol violation.
*/
int auth_rsa(struct passwd * pw, BIGNUM * client_n);
/*
* Parses an RSA key (number of bits, e, n) from a string. Moves the pointer
* over the key. Skips any whitespace at the beginning and at end.
*/
int auth_rsa_read_key(char **cpp, u_int *bitsp, BIGNUM * e, BIGNUM * n);
/*
* Performs the RSA authentication challenge-response dialog with the client,
* and returns true (non-zero) if the client gave the correct answer to our
* challenge; returns zero if the client gives a wrong answer.
*/
int auth_rsa_challenge_dialog(RSA *pk);
#ifdef KRB4
#include <krb.h>
/*
* Performs Kerberos v4 mutual authentication with the client. This returns 0
* if the client could not be authenticated, and 1 if authentication was
* successful. This may exit if there is a serious protocol violation.
*/
int auth_krb4(const char *server_user, KTEXT auth, char **client);
int krb4_init(uid_t uid);
void krb4_cleanup_proc(void *ignore);
int auth_krb4_password(struct passwd * pw, const char *password);
#ifdef AFS
#include <kafs.h>
/* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
int auth_kerberos_tgt(struct passwd * pw, const char *string);
int auth_afs_token(struct passwd * pw, const char *token_string);
#endif /* AFS */
#endif /* KRB4 */
#include "auth-pam.h"
#include "auth2-pam.h"
void do_authentication(void);
void do_authentication2(void);
Authctxt *authctxt_new(void);
void auth_log(Authctxt *authctxt, int authenticated, char *method, char *info);
void userauth_finish(Authctxt *authctxt, int authenticated, char *method);
int auth_root_allowed(char *method);
int auth2_challenge(Authctxt *authctxt, char *devs);
int allowed_user(struct passwd * pw);
char *get_challenge(Authctxt *authctxt);
int verify_response(Authctxt *authctxt, const char *response);
struct passwd * auth_get_user(void);
/* expand a filename - return buffer is allocated by xmalloc */
char *expand_filename(const char *template, struct passwd *pw);
char *authorized_keys_file(struct passwd *pw);
char *authorized_keys_file2(struct passwd *pw);
/* check a file and the path to it */
int
secure_filename(FILE *f, const char *file, uid_t u, char *err, size_t errlen);
/* helper for hostbased auth */
HostStatus
check_key_in_hostfiles(struct passwd *pw, Key *key, const char *host,
const char *sysfile, const char *userfile);
#define AUTH_FAIL_MAX 6
#define AUTH_FAIL_LOG (AUTH_FAIL_MAX/2)
#define AUTH_FAIL_MSG "Too many authentication failures for %.100s"
#endif
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