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659 lines
15 KiB
C
659 lines
15 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)auth.c 8.1 (Berkeley) 6/4/93";
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#endif /* not lint */
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/*
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* Copyright (C) 1990 by the Massachusetts Institute of Technology
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*
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* Export of this software from the United States of America is assumed
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* to require a specific license from the United States Government.
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* It is the responsibility of any person or organization contemplating
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* export to obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of M.I.T. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*/
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#if defined(AUTHENTICATION)
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#include <stdio.h>
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#include <sys/types.h>
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#include <signal.h>
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#define AUTH_NAMES
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#include <arpa/telnet.h>
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#ifdef __STDC__
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#include <stdlib.h>
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#endif
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#ifdef NO_STRING_H
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#include <strings.h>
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#else
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#include <string.h>
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#endif
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#include "encrypt.h"
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#include "auth.h"
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#include "misc-proto.h"
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#include "auth-proto.h"
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#define typemask(x) (1<<((x)-1))
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#ifdef KRB4_ENCPWD
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extern krb4encpwd_init();
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extern krb4encpwd_send();
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extern krb4encpwd_is();
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extern krb4encpwd_reply();
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extern krb4encpwd_status();
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extern krb4encpwd_printsub();
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#endif
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#ifdef RSA_ENCPWD
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extern rsaencpwd_init();
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extern rsaencpwd_send();
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extern rsaencpwd_is();
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extern rsaencpwd_reply();
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extern rsaencpwd_status();
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extern rsaencpwd_printsub();
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#endif
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int auth_debug_mode = 0;
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static char *Name = "Noname";
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static int Server = 0;
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static Authenticator *authenticated = 0;
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static int authenticating = 0;
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static int validuser = 0;
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static unsigned char _auth_send_data[256];
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static unsigned char *auth_send_data;
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static int auth_send_cnt = 0;
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/*
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* Authentication types supported. Plese note that these are stored
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* in priority order, i.e. try the first one first.
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*/
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Authenticator authenticators[] = {
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#ifdef SPX
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{ AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
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spx_init,
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spx_send,
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spx_is,
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spx_reply,
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spx_status,
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spx_printsub },
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{ AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
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spx_init,
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spx_send,
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spx_is,
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spx_reply,
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spx_status,
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spx_printsub },
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#endif
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#ifdef KRB5
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# ifdef ENCRYPTION
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{ AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
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kerberos5_init,
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kerberos5_send,
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kerberos5_is,
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kerberos5_reply,
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kerberos5_status,
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kerberos5_printsub },
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# endif /* ENCRYPTION */
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{ AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
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kerberos5_init,
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kerberos5_send,
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kerberos5_is,
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kerberos5_reply,
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kerberos5_status,
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kerberos5_printsub },
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#endif
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#ifdef KRB4
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# ifdef ENCRYPTION
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{ AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
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kerberos4_init,
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kerberos4_send,
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kerberos4_is,
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kerberos4_reply,
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kerberos4_status,
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kerberos4_printsub },
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# endif /* ENCRYPTION */
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{ AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
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kerberos4_init,
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kerberos4_send,
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kerberos4_is,
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kerberos4_reply,
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kerberos4_status,
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kerberos4_printsub },
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#endif
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#ifdef KRB4_ENCPWD
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{ AUTHTYPE_KRB4_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
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krb4encpwd_init,
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krb4encpwd_send,
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krb4encpwd_is,
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krb4encpwd_reply,
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krb4encpwd_status,
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krb4encpwd_printsub },
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#endif
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#ifdef RSA_ENCPWD
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{ AUTHTYPE_RSA_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
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rsaencpwd_init,
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rsaencpwd_send,
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rsaencpwd_is,
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rsaencpwd_reply,
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rsaencpwd_status,
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rsaencpwd_printsub },
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#endif
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{ 0, },
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};
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static Authenticator NoAuth = { 0 };
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static int i_support = 0;
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static int i_wont_support = 0;
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Authenticator *
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findauthenticator(type, way)
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int type;
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int way;
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{
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Authenticator *ap = authenticators;
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while (ap->type && (ap->type != type || ap->way != way))
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++ap;
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return(ap->type ? ap : 0);
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}
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void
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auth_init(name, server)
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char *name;
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int server;
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{
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Authenticator *ap = authenticators;
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Server = server;
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Name = name;
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i_support = 0;
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authenticated = 0;
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authenticating = 0;
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while (ap->type) {
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if (!ap->init || (*ap->init)(ap, server)) {
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i_support |= typemask(ap->type);
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if (auth_debug_mode)
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printf(">>>%s: I support auth type %d %d\r\n",
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Name,
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ap->type, ap->way);
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}
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++ap;
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}
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}
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void
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auth_disable_name(name)
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char *name;
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{
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int x;
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for (x = 0; x < AUTHTYPE_CNT; ++x) {
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if (!strcasecmp(name, AUTHTYPE_NAME(x))) {
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i_wont_support |= typemask(x);
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break;
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}
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}
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}
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int
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getauthmask(type, maskp)
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char *type;
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int *maskp;
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{
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register int x;
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if (strcasecmp(type, AUTHTYPE_NAME(0))) {
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*maskp = -1;
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return(1);
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}
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for (x = 1; x < AUTHTYPE_CNT; ++x) {
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if (!strcasecmp(type, AUTHTYPE_NAME(x))) {
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*maskp = typemask(x);
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return(1);
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}
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}
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return(0);
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}
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int
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auth_enable(type)
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int type;
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{
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return(auth_onoff(type, 1));
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}
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int
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auth_disable(type)
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int type;
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{
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return(auth_onoff(type, 0));
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}
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int
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auth_onoff(type, on)
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char *type;
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int on;
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{
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int mask = -1;
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Authenticator *ap;
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if (!strcasecmp(type, "?") || !strcasecmp(type, "help")) {
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printf("auth %s 'type'\n", on ? "enable" : "disable");
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printf("Where 'type' is one of:\n");
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printf("\t%s\n", AUTHTYPE_NAME(0));
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for (ap = authenticators; ap->type; ap++)
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printf("\t%s\n", AUTHTYPE_NAME(ap->type));
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return(0);
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}
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if (!getauthmask(type, &mask)) {
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printf("%s: invalid authentication type\n", type);
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return(0);
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}
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mask = getauthmask(type, &mask);
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if (on)
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i_wont_support &= ~mask;
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else
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i_wont_support |= mask;
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return(1);
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}
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int
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auth_togdebug(on)
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int on;
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{
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if (on < 0)
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auth_debug_mode ^= 1;
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else
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auth_debug_mode = on;
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printf("auth debugging %s\n", auth_debug_mode ? "enabled" : "disabled");
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return(1);
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}
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int
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auth_status()
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{
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Authenticator *ap;
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if (i_wont_support == -1)
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printf("Authentication disabled\n");
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else
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printf("Authentication enabled\n");
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for (ap = authenticators; ap->type; ap++)
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printf("%s: %s\n", AUTHTYPE_NAME(ap->type),
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(i_wont_support & typemask(ap->type)) ?
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"disabled" : "enabled");
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return(1);
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}
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/*
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* This routine is called by the server to start authentication
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* negotiation.
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*/
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void
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auth_request()
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{
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static unsigned char str_request[64] = { IAC, SB,
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TELOPT_AUTHENTICATION,
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TELQUAL_SEND, };
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Authenticator *ap = authenticators;
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unsigned char *e = str_request + 4;
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if (!authenticating) {
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authenticating = 1;
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while (ap->type) {
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if (i_support & ~i_wont_support & typemask(ap->type)) {
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if (auth_debug_mode) {
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printf(">>>%s: Sending type %d %d\r\n",
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Name, ap->type, ap->way);
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}
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*e++ = ap->type;
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*e++ = ap->way;
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}
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++ap;
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}
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*e++ = IAC;
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*e++ = SE;
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net_write(str_request, e - str_request);
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printsub('>', &str_request[2], e - str_request - 2);
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}
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}
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/*
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* This is called when an AUTH SEND is received.
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* It should never arrive on the server side (as only the server can
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* send an AUTH SEND).
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* You should probably respond to it if you can...
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*
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* If you want to respond to the types out of order (i.e. even
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* if he sends LOGIN KERBEROS and you support both, you respond
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* with KERBEROS instead of LOGIN (which is against what the
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* protocol says)) you will have to hack this code...
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*/
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void
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auth_send(data, cnt)
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unsigned char *data;
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int cnt;
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{
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Authenticator *ap;
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static unsigned char str_none[] = { IAC, SB, TELOPT_AUTHENTICATION,
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TELQUAL_IS, AUTHTYPE_NULL, 0,
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IAC, SE };
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if (Server) {
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if (auth_debug_mode) {
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printf(">>>%s: auth_send called!\r\n", Name);
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}
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return;
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}
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if (auth_debug_mode) {
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printf(">>>%s: auth_send got:", Name);
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printd(data, cnt); printf("\r\n");
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}
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/*
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* Save the data, if it is new, so that we can continue looking
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* at it if the authorization we try doesn't work
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*/
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if (data < _auth_send_data ||
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data > _auth_send_data + sizeof(_auth_send_data)) {
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auth_send_cnt = cnt > sizeof(_auth_send_data)
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? sizeof(_auth_send_data)
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: cnt;
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bcopy((void *)data, (void *)_auth_send_data, auth_send_cnt);
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auth_send_data = _auth_send_data;
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} else {
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/*
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* This is probably a no-op, but we just make sure
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*/
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auth_send_data = data;
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auth_send_cnt = cnt;
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}
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while ((auth_send_cnt -= 2) >= 0) {
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if (auth_debug_mode)
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printf(">>>%s: He supports %d\r\n",
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Name, *auth_send_data);
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if ((i_support & ~i_wont_support) & typemask(*auth_send_data)) {
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ap = findauthenticator(auth_send_data[0],
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auth_send_data[1]);
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if (ap && ap->send) {
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if (auth_debug_mode)
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printf(">>>%s: Trying %d %d\r\n",
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Name, auth_send_data[0],
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auth_send_data[1]);
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if ((*ap->send)(ap)) {
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/*
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* Okay, we found one we like
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* and did it.
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* we can go home now.
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*/
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if (auth_debug_mode)
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printf(">>>%s: Using type %d\r\n",
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Name, *auth_send_data);
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auth_send_data += 2;
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return;
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}
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}
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/* else
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* just continue on and look for the
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* next one if we didn't do anything.
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*/
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}
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auth_send_data += 2;
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}
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net_write(str_none, sizeof(str_none));
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printsub('>', &str_none[2], sizeof(str_none) - 2);
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if (auth_debug_mode)
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printf(">>>%s: Sent failure message\r\n", Name);
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auth_finished(0, AUTH_REJECT);
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#ifdef KANNAN
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/*
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* We requested strong authentication, however no mechanisms worked.
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* Therefore, exit on client end.
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*/
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printf("Unable to securely authenticate user ... exit\n");
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exit(0);
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#endif /* KANNAN */
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}
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void
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auth_send_retry()
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{
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/*
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* if auth_send_cnt <= 0 then auth_send will end up rejecting
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* the authentication and informing the other side of this.
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*/
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auth_send(auth_send_data, auth_send_cnt);
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}
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void
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auth_is(data, cnt)
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unsigned char *data;
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int cnt;
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{
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Authenticator *ap;
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if (cnt < 2)
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return;
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if (data[0] == AUTHTYPE_NULL) {
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auth_finished(0, AUTH_REJECT);
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return;
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}
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if (ap = findauthenticator(data[0], data[1])) {
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if (ap->is)
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(*ap->is)(ap, data+2, cnt-2);
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} else if (auth_debug_mode)
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printf(">>>%s: Invalid authentication in IS: %d\r\n",
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Name, *data);
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}
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void
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auth_reply(data, cnt)
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unsigned char *data;
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int cnt;
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{
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Authenticator *ap;
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if (cnt < 2)
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return;
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if (ap = findauthenticator(data[0], data[1])) {
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if (ap->reply)
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(*ap->reply)(ap, data+2, cnt-2);
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} else if (auth_debug_mode)
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printf(">>>%s: Invalid authentication in SEND: %d\r\n",
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Name, *data);
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}
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void
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auth_name(data, cnt)
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unsigned char *data;
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int cnt;
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{
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Authenticator *ap;
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unsigned char savename[256];
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if (cnt < 1) {
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if (auth_debug_mode)
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printf(">>>%s: Empty name in NAME\r\n", Name);
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return;
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}
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if (cnt > sizeof(savename) - 1) {
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if (auth_debug_mode)
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printf(">>>%s: Name in NAME (%d) exceeds %d length\r\n",
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Name, cnt, sizeof(savename)-1);
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return;
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}
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bcopy((void *)data, (void *)savename, cnt);
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savename[cnt] = '\0'; /* Null terminate */
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if (auth_debug_mode)
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printf(">>>%s: Got NAME [%s]\r\n", Name, savename);
|
|
auth_encrypt_user(savename);
|
|
}
|
|
|
|
int
|
|
auth_sendname(cp, len)
|
|
unsigned char *cp;
|
|
int len;
|
|
{
|
|
static unsigned char str_request[256+6]
|
|
= { IAC, SB, TELOPT_AUTHENTICATION, TELQUAL_NAME, };
|
|
register unsigned char *e = str_request + 4;
|
|
register unsigned char *ee = &str_request[sizeof(str_request)-2];
|
|
|
|
while (--len >= 0) {
|
|
if ((*e++ = *cp++) == IAC)
|
|
*e++ = IAC;
|
|
if (e >= ee)
|
|
return(0);
|
|
}
|
|
*e++ = IAC;
|
|
*e++ = SE;
|
|
net_write(str_request, e - str_request);
|
|
printsub('>', &str_request[2], e - &str_request[2]);
|
|
return(1);
|
|
}
|
|
|
|
void
|
|
auth_finished(ap, result)
|
|
Authenticator *ap;
|
|
int result;
|
|
{
|
|
if (!(authenticated = ap))
|
|
authenticated = &NoAuth;
|
|
validuser = result;
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
auth_intr(sig)
|
|
int sig;
|
|
{
|
|
auth_finished(0, AUTH_REJECT);
|
|
}
|
|
|
|
int
|
|
auth_wait(name)
|
|
char *name;
|
|
{
|
|
if (auth_debug_mode)
|
|
printf(">>>%s: in auth_wait.\r\n", Name);
|
|
|
|
if (Server && !authenticating)
|
|
return(0);
|
|
|
|
(void) signal(SIGALRM, auth_intr);
|
|
alarm(30);
|
|
while (!authenticated)
|
|
if (telnet_spin())
|
|
break;
|
|
alarm(0);
|
|
(void) signal(SIGALRM, SIG_DFL);
|
|
|
|
/*
|
|
* Now check to see if the user is valid or not
|
|
*/
|
|
if (!authenticated || authenticated == &NoAuth)
|
|
return(AUTH_REJECT);
|
|
|
|
if (validuser == AUTH_VALID)
|
|
validuser = AUTH_USER;
|
|
|
|
if (authenticated->status)
|
|
validuser = (*authenticated->status)(authenticated,
|
|
name, validuser);
|
|
return(validuser);
|
|
}
|
|
|
|
void
|
|
auth_debug(mode)
|
|
int mode;
|
|
{
|
|
auth_debug_mode = mode;
|
|
}
|
|
|
|
void
|
|
auth_printsub(data, cnt, buf, buflen)
|
|
unsigned char *data, *buf;
|
|
int cnt, buflen;
|
|
{
|
|
Authenticator *ap;
|
|
|
|
if ((ap = findauthenticator(data[1], data[2])) && ap->printsub)
|
|
(*ap->printsub)(data, cnt, buf, buflen);
|
|
else
|
|
auth_gen_printsub(data, cnt, buf, buflen);
|
|
}
|
|
|
|
void
|
|
auth_gen_printsub(data, cnt, buf, buflen)
|
|
unsigned char *data, *buf;
|
|
int cnt, buflen;
|
|
{
|
|
register unsigned char *cp;
|
|
unsigned char tbuf[16];
|
|
|
|
cnt -= 3;
|
|
data += 3;
|
|
buf[buflen-1] = '\0';
|
|
buf[buflen-2] = '*';
|
|
buflen -= 2;
|
|
for (; cnt > 0; cnt--, data++) {
|
|
sprintf((char *)tbuf, " %d", *data);
|
|
for (cp = tbuf; *cp && buflen > 0; --buflen)
|
|
*buf++ = *cp++;
|
|
if (buflen <= 0)
|
|
return;
|
|
}
|
|
*buf = '\0';
|
|
}
|
|
#endif
|