493 lines
12 KiB
C
493 lines
12 KiB
C
/*-
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* Copyright (c) 1992, 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[] = "@(#)rsaencpwd.c 8.1 (Berkeley) 6/4/93";
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#endif /* not lint */
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#ifdef RSA_ENCPWD
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/*
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* COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION
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* ALL RIGHTS RESERVED
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*
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* "Digital Equipment Corporation authorizes the reproduction,
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* distribution and modification of this software subject to the following
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* restrictions:
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*
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* 1. Any partial or whole copy of this software, or any modification
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* thereof, must include this copyright notice in its entirety.
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*
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* 2. This software is supplied "as is" with no warranty of any kind,
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* expressed or implied, for any purpose, including any warranty of fitness
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* or merchantibility. DIGITAL assumes no responsibility for the use or
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* reliability of this software, nor promises to provide any form of
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* support for it on any basis.
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*
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* 3. Distribution of this software is authorized only if no profit or
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* remuneration of any kind is received in exchange for such distribution.
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*
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* 4. This software produces public key authentication certificates
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* bearing an expiration date established by DIGITAL and RSA Data
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* Security, Inc. It may cease to generate certificates after the expiration
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* date. Any modification of this software that changes or defeats
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* the expiration date or its effect is unauthorized.
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*
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* 5. Software that will renew or extend the expiration date of
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* authentication certificates produced by this software may be obtained
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* from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA
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* 94065, (415)595-8782, or from DIGITAL"
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*
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*/
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#include <sys/types.h>
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#include <arpa/telnet.h>
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#include <pwd.h>
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#include <stdio.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.h"
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#include "cdc.h"
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extern auth_debug_mode;
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static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
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AUTHTYPE_RSA_ENCPWD, };
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static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
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TELQUAL_NAME, };
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#define RSA_ENCPWD_AUTH 0 /* Authentication data follows */
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#define RSA_ENCPWD_REJECT 1 /* Rejected (reason might follow) */
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#define RSA_ENCPWD_ACCEPT 2 /* Accepted */
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#define RSA_ENCPWD_CHALLENGEKEY 3 /* Challenge and public key */
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#define NAME_SZ 40
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#define CHAL_SZ 20
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#define PWD_SZ 40
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static KTEXT_ST auth;
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static char name[NAME_SZ];
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static char user_passwd[PWD_SZ];
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static char key_file[2*NAME_SZ];
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static char lhostname[NAME_SZ];
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static char challenge[CHAL_SZ];
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static int challenge_len;
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static int
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Data(ap, type, d, c)
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Authenticator *ap;
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int type;
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void *d;
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int c;
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{
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unsigned char *p = str_data + 4;
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unsigned char *cd = (unsigned char *)d;
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if (c == -1)
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c = strlen((char *)cd);
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if (0) {
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printf("%s:%d: [%d] (%d)",
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str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
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str_data[3],
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type, c);
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printd(d, c);
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printf("\r\n");
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}
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*p++ = ap->type;
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*p++ = ap->way;
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if (type != NULL) *p++ = type;
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while (c-- > 0) {
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if ((*p++ = *cd++) == IAC)
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*p++ = IAC;
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}
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*p++ = IAC;
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*p++ = SE;
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if (str_data[3] == TELQUAL_IS)
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printsub('>', &str_data[2], p - (&str_data[2]));
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return(net_write(str_data, p - str_data));
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}
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int
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rsaencpwd_init(ap, server)
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Authenticator *ap;
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int server;
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{
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char *cp;
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FILE *fp;
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if (server) {
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str_data[3] = TELQUAL_REPLY;
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bzero(key_file, sizeof(key_file));
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gethostname(lhostname, sizeof(lhostname));
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if ((cp = index(lhostname, '.')) != 0) *cp = '\0';
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strcpy(key_file, "/etc/.");
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strcat(key_file, lhostname);
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strcat(key_file, "_privkey");
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if ((fp=fopen(key_file, "r"))==NULL) return(0);
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fclose(fp);
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} else {
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str_data[3] = TELQUAL_IS;
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}
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return(1);
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}
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int
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rsaencpwd_send(ap)
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Authenticator *ap;
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{
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printf("[ Trying RSAENCPWD ... ]\n");
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if (!UserNameRequested) {
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return(0);
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}
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if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
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return(0);
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}
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if (!Data(ap, NULL, (void *)NULL, 0)) {
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return(0);
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}
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return(1);
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}
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void
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rsaencpwd_is(ap, data, cnt)
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Authenticator *ap;
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unsigned char *data;
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int cnt;
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{
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Session_Key skey;
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Block datablock;
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char r_passwd[PWD_SZ], r_user[NAME_SZ];
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char *cp, key[160];
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char chalkey[160], *ptr;
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FILE *fp;
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int r, i, j, chalkey_len, len;
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time_t now;
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cnt--;
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switch (*data++) {
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case RSA_ENCPWD_AUTH:
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bcopy((void *)data, (void *)auth.dat, auth.length = cnt);
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if ((fp=fopen(key_file, "r"))==NULL) {
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Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
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auth_finished(ap, AUTH_REJECT);
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return;
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}
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/*
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* get privkey
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*/
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fscanf(fp, "%x;", &len);
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for (i=0;i<len;i++) {
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j = getc(fp); key[i]=j;
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}
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fclose(fp);
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r = accept_rsa_encpwd(&auth, key, challenge,
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challenge_len, r_passwd);
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if (r < 0) {
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Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
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auth_finished(ap, AUTH_REJECT);
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return;
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}
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auth_encrypt_userpwd(r_passwd);
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if (rsaencpwd_passwdok(UserNameRequested, UserPassword) == 0) {
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/*
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* illegal username and password
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*/
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Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
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auth_finished(ap, AUTH_REJECT);
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return;
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}
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Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
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auth_finished(ap, AUTH_USER);
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break;
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case IAC:
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/*
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* If we are doing mutual authentication, get set up to send
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* the challange, and verify it when the response comes back.
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*/
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if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_ONE_WAY) {
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register int i;
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time(&now);
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if ((now % 2) == 0) {
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sprintf(challenge, "%x", now);
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challenge_len = strlen(challenge);
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} else {
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strcpy(challenge, "randchal");
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challenge_len = 8;
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}
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if ((fp=fopen(key_file, "r"))==NULL) {
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Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
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auth_finished(ap, AUTH_REJECT);
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return;
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}
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/*
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* skip privkey
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*/
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fscanf(fp, "%x;", &len);
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for (i=0;i<len;i++) {
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j = getc(fp);
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}
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/*
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* get pubkey
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*/
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fscanf(fp, "%x;", &len);
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for (i=0;i<len;i++) {
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j = getc(fp); key[i]=j;
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}
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fclose(fp);
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chalkey[0] = 0x30;
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ptr = (char *) &chalkey[1];
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chalkey_len = 1+NumEncodeLengthOctets(i)+i+1+NumEncodeLengthOctets(challenge_len)+challenge_len;
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EncodeLength(ptr, chalkey_len);
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ptr +=NumEncodeLengthOctets(chalkey_len);
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*ptr++ = 0x04; /* OCTET STRING */
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*ptr++ = challenge_len;
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bcopy(challenge, ptr, challenge_len);
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ptr += challenge_len;
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*ptr++ = 0x04; /* OCTET STRING */
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EncodeLength(ptr, i);
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ptr += NumEncodeLengthOctets(i);
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bcopy(key, ptr, i);
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chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
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Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
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}
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break;
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default:
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Data(ap, RSA_ENCPWD_REJECT, 0, 0);
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break;
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}
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}
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void
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rsaencpwd_reply(ap, data, cnt)
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Authenticator *ap;
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unsigned char *data;
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int cnt;
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{
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Session_Key skey;
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KTEXT_ST token;
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Block enckey;
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int r, pubkey_len;
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char randchal[CHAL_SZ], *cp;
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char chalkey[160], pubkey[128], *ptr;
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if (cnt-- < 1)
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return;
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switch (*data++) {
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case RSA_ENCPWD_REJECT:
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if (cnt > 0) {
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printf("[ RSA_ENCPWD refuses authentication because %.*s ]\r\n",
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cnt, data);
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} else
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printf("[ RSA_ENCPWD refuses authentication ]\r\n");
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auth_send_retry();
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return;
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case RSA_ENCPWD_ACCEPT:
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printf("[ RSA_ENCPWD accepts you ]\n");
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auth_finished(ap, AUTH_USER);
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return;
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case RSA_ENCPWD_CHALLENGEKEY:
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/*
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* Verify that the response to the challenge is correct.
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*/
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bcopy((void *)data, (void *)chalkey, cnt);
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ptr = (char *) &chalkey[0];
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ptr += DecodeHeaderLength(chalkey);
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if (*ptr != 0x04) {
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return;
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}
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*ptr++;
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challenge_len = DecodeValueLength(ptr);
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ptr += NumEncodeLengthOctets(challenge_len);
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bcopy(ptr, challenge, challenge_len);
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ptr += challenge_len;
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if (*ptr != 0x04) {
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return;
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}
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*ptr++;
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pubkey_len = DecodeValueLength(ptr);
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ptr += NumEncodeLengthOctets(pubkey_len);
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bcopy(ptr, pubkey, pubkey_len);
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bzero(user_passwd, sizeof(user_passwd));
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local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
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UserPassword = user_passwd;
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Challenge = challenge;
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r = init_rsa_encpwd(&token, user_passwd, challenge, challenge_len, pubkey);
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if (r < 0) {
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token.length = 1;
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}
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if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
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return;
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}
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break;
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default:
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return;
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}
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}
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int
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rsaencpwd_status(ap, name, level)
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Authenticator *ap;
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char *name;
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int level;
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{
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if (level < AUTH_USER)
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return(level);
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if (UserNameRequested && rsaencpwd_passwdok(UserNameRequested, UserPassword)) {
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strcpy(name, UserNameRequested);
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return(AUTH_VALID);
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} else {
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return(AUTH_USER);
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}
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}
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#define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
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#define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
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void
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rsaencpwd_printsub(data, cnt, buf, buflen)
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unsigned char *data, *buf;
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int cnt, buflen;
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{
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char lbuf[32];
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register int i;
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buf[buflen-1] = '\0'; /* make sure its NULL terminated */
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buflen -= 1;
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switch(data[3]) {
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case RSA_ENCPWD_REJECT: /* Rejected (reason might follow) */
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strncpy((char *)buf, " REJECT ", buflen);
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goto common;
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case RSA_ENCPWD_ACCEPT: /* Accepted (name might follow) */
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strncpy((char *)buf, " ACCEPT ", buflen);
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common:
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BUMP(buf, buflen);
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if (cnt <= 4)
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break;
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ADDC(buf, buflen, '"');
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for (i = 4; i < cnt; i++)
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ADDC(buf, buflen, data[i]);
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ADDC(buf, buflen, '"');
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ADDC(buf, buflen, '\0');
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break;
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case RSA_ENCPWD_AUTH: /* Authentication data follows */
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strncpy((char *)buf, " AUTH", buflen);
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goto common2;
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case RSA_ENCPWD_CHALLENGEKEY:
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strncpy((char *)buf, " CHALLENGEKEY", buflen);
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goto common2;
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default:
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sprintf(lbuf, " %d (unknown)", data[3]);
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strncpy((char *)buf, lbuf, buflen);
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common2:
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BUMP(buf, buflen);
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for (i = 4; i < cnt; i++) {
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sprintf(lbuf, " %d", data[i]);
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strncpy((char *)buf, lbuf, buflen);
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BUMP(buf, buflen);
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}
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break;
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}
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}
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int rsaencpwd_passwdok(name, passwd)
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char *name, *passwd;
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{
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char *crypt();
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char *salt, *p;
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struct passwd *pwd;
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int passwdok_status = 0;
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if (pwd = getpwnam(name))
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salt = pwd->pw_passwd;
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else salt = "xx";
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p = crypt(passwd, salt);
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if (pwd && !strcmp(p, pwd->pw_passwd)) {
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passwdok_status = 1;
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} else passwdok_status = 0;
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return(passwdok_status);
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}
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#endif
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#ifdef notdef
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prkey(msg, key)
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char *msg;
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unsigned char *key;
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{
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register int i;
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printf("%s:", msg);
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for (i = 0; i < 8; i++)
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printf(" %3d", key[i]);
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printf("\r\n");
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}
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#endif
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