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      1 /*
      2  * Copyright 2002 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 #pragma ident	"%Z%%M%	%I%	%E% SMI"
      7 
      8 /*
      9  * Miscellaneous routines needed by the telnet client for authentication
     10  * and / or encryption.
     11  */
     12 
     13 /*
     14  * Copyright (c) 1991, 1993
     15  *	The Regents of the University of California.  All rights reserved.
     16  *
     17  * Redistribution and use in source and binary forms, with or without
     18  * modification, are permitted provided that the following conditions
     19  * are met:
     20  * 1. Redistributions of source code must retain the above copyright
     21  *    notice, this list of conditions and the following disclaimer.
     22  * 2. Redistributions in binary form must reproduce the above copyright
     23  *    notice, this list of conditions and the following disclaimer in the
     24  *    documentation and/or other materials provided with the distribution.
     25  * 3. All advertising materials mentioning features or use of this software
     26  *    must display the following acknowledgement:
     27  *	This product includes software developed by the University of
     28  *	California, Berkeley and its contributors.
     29  * 4. Neither the name of the University nor the names of its contributors
     30  *    may be used to endorse or promote products derived from this software
     31  *    without specific prior written permission.
     32  *
     33  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     43  * SUCH DAMAGE.
     44  */
     45 
     46 #ifndef lint
     47 static char sccsid[] = "@(#)authenc.c	8.1 (Berkeley) 6/6/93";
     48 #endif /* not lint */
     49 
     50 #include <sys/types.h>
     51 #include <arpa/telnet.h>
     52 
     53 #include "general.h"
     54 #include "ring.h"
     55 #include "externs.h"
     56 #include "defines.h"
     57 #include "types.h"
     58 
     59 char *RemoteHostName = NULL;
     60 char *UserNameRequested = NULL;
     61 
     62 #define	MAXNETDATA	16
     63 
     64 /*
     65  * Get ready to do authentication and encryption by calling their
     66  * init routines, and clearing the user name variable
     67  */
     68 /* ARGSUSED */
     69 void
     70 auth_encrypt_init(char *local, char *remote, char *name)
     71 {
     72 	RemoteHostName = remote;
     73 
     74 	auth_init(name);
     75 
     76 	encrypt_init(name);
     77 
     78 	if (UserNameRequested) {
     79 		free(UserNameRequested);
     80 		UserNameRequested = NULL;
     81 	}
     82 }
     83 
     84 /*
     85  * Set the user name variable.  This is the user name used from now
     86  * on for authentication and encryption
     87  */
     88 void
     89 auth_encrypt_user(char *name)
     90 {
     91 	if (UserNameRequested)
     92 		free(UserNameRequested);
     93 	UserNameRequested = name ? strdup(name) : NULL;
     94 }
     95 
     96 int
     97 net_write(unsigned char *str, int len)
     98 {
     99 	if (NETROOM() > len) {
    100 		ring_supply_data(&netoring, str, len);
    101 		if (str[0] == IAC && str[1] == SE)
    102 			printsub('>', &str[2], len - 2);
    103 		return (len);
    104 	}
    105 	return (0);
    106 }
    107 
    108 void
    109 net_encrypt(void)
    110 {
    111 	if (encrypt_output)
    112 		ring_encrypt(&netoring, encrypt_output);
    113 	else
    114 		ring_clearto(&netoring);
    115 }
    116 
    117 /*
    118  * Spin to wait for authentication to complete
    119  * This allows for a timeout
    120  */
    121 void
    122 telnet_spin(void)
    123 {
    124 	extern boolean_t scheduler_lockout_tty;
    125 
    126 	scheduler_lockout_tty = B_TRUE;
    127 	(void) Scheduler(0);
    128 	scheduler_lockout_tty = B_FALSE;
    129 }
    130 
    131 
    132 /*
    133  * Used to print out unsigned chars as decimals for debugging options
    134  */
    135 void
    136 printd(unsigned char *data, int cnt)
    137 {
    138 	cnt = (cnt < MAXNETDATA) ? cnt:MAXNETDATA;
    139 	while (cnt-- > 0)
    140 		(void) printf(" %02x", *data++);
    141 }
    142