From d7dbd335bfc76ace0a0d3a13a5ba83b7c6734bfc Mon Sep 17 00:00:00 2001 From: Cameron Katri Date: Mon, 10 May 2021 14:55:53 -0400 Subject: libtelnet-13 --- lib/libtelnet/krb4encpwd.c | 430 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 430 insertions(+) create mode 100644 lib/libtelnet/krb4encpwd.c (limited to 'lib/libtelnet/krb4encpwd.c') diff --git a/lib/libtelnet/krb4encpwd.c b/lib/libtelnet/krb4encpwd.c new file mode 100644 index 0000000..6af7bf6 --- /dev/null +++ b/lib/libtelnet/krb4encpwd.c @@ -0,0 +1,430 @@ +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. + */ + +#include + +#ifdef __FBSDID +__FBSDID("$FreeBSD: src/crypto/telnet/libtelnet/krb4encpwd.c,v 1.3.2.1 2002/04/13 10:59:07 markm Exp $"); +#endif + +#ifndef lint +static const char sccsid[] = "@(#)krb4encpwd.c 8.3 (Berkeley) 5/30/95"; +#endif /* not lint */ + + +#ifdef KRB4_ENCPWD +/* + * COPYRIGHT (C) 1990 DIGITAL EQUIPMENT CORPORATION + * ALL RIGHTS RESERVED + * + * "Digital Equipment Corporation authorizes the reproduction, + * distribution and modification of this software subject to the following + * restrictions: + * + * 1. Any partial or whole copy of this software, or any modification + * thereof, must include this copyright notice in its entirety. + * + * 2. This software is supplied "as is" with no warranty of any kind, + * expressed or implied, for any purpose, including any warranty of fitness + * or merchantibility. DIGITAL assumes no responsibility for the use or + * reliability of this software, nor promises to provide any form of + * support for it on any basis. + * + * 3. Distribution of this software is authorized only if no profit or + * remuneration of any kind is received in exchange for such distribution. + * + * 4. This software produces public key authentication certificates + * bearing an expiration date established by DIGITAL and RSA Data + * Security, Inc. It may cease to generate certificates after the expiration + * date. Any modification of this software that changes or defeats + * the expiration date or its effect is unauthorized. + * + * 5. Software that will renew or extend the expiration date of + * authentication certificates produced by this software may be obtained + * from RSA Data Security, Inc., 10 Twin Dolphin Drive, Redwood City, CA + * 94065, (415)595-8782, or from DIGITAL" + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "encrypt.h" +#include "auth.h" +#include "misc.h" + +int krb_mk_encpwd_req(KTEXT, char *, char *, char *, char *, char *, char *); +int krb_rd_encpwd_req(KTEXT, char *, char *, u_long, AUTH_DAT *, char *, char *, char *, char *); + +extern auth_debug_mode; + +static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0, + AUTHTYPE_KRB4_ENCPWD, }; +static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION, + TELQUAL_NAME, }; + +#define KRB4_ENCPWD_AUTH 0 /* Authentication data follows */ +#define KRB4_ENCPWD_REJECT 1 /* Rejected (reason might follow) */ +#define KRB4_ENCPWD_ACCEPT 2 /* Accepted */ +#define KRB4_ENCPWD_CHALLENGE 3 /* Challenge for mutual auth. */ +#define KRB4_ENCPWD_ACK 4 /* Acknowledge */ + +#define KRB_SERVICE_NAME "rcmd" + +static KTEXT_ST auth; +static char name[ANAME_SZ]; +static char user_passwd[ANAME_SZ]; +static AUTH_DAT adat = { 0 }; +#ifdef ENCRYPTION +static Block session_key = { 0 }; +#endif /* ENCRYPTION */ +static char challenge[REALM_SZ]; + + static int +Data(ap, type, d, c) + Authenticator *ap; + int type; + void *d; + int c; +{ + unsigned char *p = str_data + 4; + unsigned char *cd = (unsigned char *)d; + + if (c == -1) + c = strlen((char *)cd); + + if (0) { + printf("%s:%d: [%d] (%d)", + str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY", + str_data[3], + type, c); + printd(d, c); + printf("\r\n"); + } + *p++ = ap->type; + *p++ = ap->way; + *p++ = type; + while (c-- > 0) { + if ((*p++ = *cd++) == IAC) + *p++ = IAC; + } + *p++ = IAC; + *p++ = SE; + if (str_data[3] == TELQUAL_IS) + printsub('>', &str_data[2], p - (&str_data[2])); + return(net_write(str_data, p - str_data)); +} + + int +krb4encpwd_init(ap, server) + Authenticator *ap; + int server; +{ + char hostname[80], *cp, *realm; + C_Block skey; + + if (server) { + str_data[3] = TELQUAL_REPLY; + } else { + str_data[3] = TELQUAL_IS; + gethostname(hostname, sizeof(hostname)); + realm = krb_realmofhost(hostname); + cp = strchr(hostname, '.'); + if (*cp != NULL) *cp = NULL; + if (read_service_key(KRB_SERVICE_NAME, hostname, realm, 0, + KEYFILE, (char *)skey)) { + return(0); + } + } + return(1); +} + + int +krb4encpwd_send(ap) + Authenticator *ap; +{ + + printf("[ Trying KRB4ENCPWD ... ]\n"); + if (!UserNameRequested) { + return(0); + } + if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) { + return(0); + } + + if (!Data(ap, KRB4_ENCPWD_ACK, (void *)NULL, 0)) { + return(0); + } + + return(1); +} + + void +krb4encpwd_is(ap, data, cnt) + Authenticator *ap; + unsigned char *data; + int cnt; +{ + Session_Key skey; + Block datablock; + char r_passwd[ANAME_SZ], r_user[ANAME_SZ]; + char lhostname[ANAME_SZ], *cp; + int r; + time_t now; + + if (cnt-- < 1) + return; + switch (*data++) { + case KRB4_ENCPWD_AUTH: + memmove((void *)auth.dat, (void *)data, auth.length = cnt); + + gethostname(lhostname, sizeof(lhostname)); + if ((cp = strchr(lhostname, '.')) != 0) *cp = '\0'; + + if (r = krb_rd_encpwd_req(&auth, KRB_SERVICE_NAME, lhostname, 0, &adat, NULL, challenge, r_user, r_passwd)) { + Data(ap, KRB4_ENCPWD_REJECT, (void *)"Auth failed", -1); + auth_finished(ap, AUTH_REJECT); + return; + } + auth_encrypt_userpwd(r_passwd); + if (passwdok(UserNameRequested, UserPassword) == 0) { + /* + * illegal username and password + */ + Data(ap, KRB4_ENCPWD_REJECT, (void *)"Illegal password", -1); + auth_finished(ap, AUTH_REJECT); + return; + } + + memmove((void *)session_key, (void *)adat.session, sizeof(Block)); + Data(ap, KRB4_ENCPWD_ACCEPT, (void *)0, 0); + auth_finished(ap, AUTH_USER); + break; + + case KRB4_ENCPWD_CHALLENGE: + /* + * Take the received random challenge text and save + * for future authentication. + */ + memmove((void *)challenge, (void *)data, sizeof(Block)); + break; + + + case KRB4_ENCPWD_ACK: + /* + * Receive ack, if mutual then send random challenge + */ + + /* + * If we are doing mutual authentication, get set up to send + * the challenge, and verify it when the response comes back. + */ + + if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) { + register int i; + + time(&now); + sprintf(challenge, "%x", now); + Data(ap, KRB4_ENCPWD_CHALLENGE, (void *)challenge, strlen(challenge)); + } + break; + + default: + Data(ap, KRB4_ENCPWD_REJECT, 0, 0); + break; + } +} + + + void +krb4encpwd_reply(ap, data, cnt) + Authenticator *ap; + unsigned char *data; + int cnt; +{ + Session_Key skey; + KTEXT_ST krb_token; + Block enckey; + CREDENTIALS cred; + int r; + char randchal[REALM_SZ], instance[ANAME_SZ], *cp; + char hostname[80], *realm; + + if (cnt-- < 1) + return; + switch (*data++) { + case KRB4_ENCPWD_REJECT: + if (cnt > 0) { + printf("[ KRB4_ENCPWD refuses authentication because %.*s ]\r\n", + cnt, data); + } else + printf("[ KRB4_ENCPWD refuses authentication ]\r\n"); + auth_send_retry(); + return; + case KRB4_ENCPWD_ACCEPT: + printf("[ KRB4_ENCPWD accepts you ]\n"); + auth_finished(ap, AUTH_USER); + return; + case KRB4_ENCPWD_CHALLENGE: + /* + * Verify that the response to the challenge is correct. + */ + + gethostname(hostname, sizeof(hostname)); + realm = krb_realmofhost(hostname); + memmove((void *)challenge, (void *)data, cnt); + memset(user_passwd, 0, sizeof(user_passwd)); + local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0); + UserPassword = user_passwd; + Challenge = challenge; + strcpy(instance, RemoteHostName); + if ((cp = strchr(instance, '.')) != 0) *cp = '\0'; + + if (r = krb_mk_encpwd_req(&krb_token, KRB_SERVICE_NAME, instance, realm, Challenge, UserNameRequested, user_passwd)) { + krb_token.length = 0; + } + + if (!Data(ap, KRB4_ENCPWD_AUTH, (void *)krb_token.dat, krb_token.length)) { + return; + } + + break; + + default: + return; + } +} + + int +krb4encpwd_status(ap, name, level) + Authenticator *ap; + char *name; + int level; +{ + + if (level < AUTH_USER) + return(level); + + if (UserNameRequested && passwdok(UserNameRequested, UserPassword)) { + strcpy(name, UserNameRequested); + return(AUTH_VALID); + } else { + return(AUTH_USER); + } +} + +#define BUMP(buf, len) while (*(buf)) {++(buf), --(len);} +#define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);} + + void +krb4encpwd_printsub(data, cnt, buf, buflen) + unsigned char *data, *buf; + int cnt, buflen; +{ + char lbuf[32]; + register int i; + + buf[buflen-1] = '\0'; /* make sure its NULL terminated */ + buflen -= 1; + + switch(data[3]) { + case KRB4_ENCPWD_REJECT: /* Rejected (reason might follow) */ + strncpy((char *)buf, " REJECT ", buflen); + goto common; + + case KRB4_ENCPWD_ACCEPT: /* Accepted (name might follow) */ + strncpy((char *)buf, " ACCEPT ", buflen); + common: + BUMP(buf, buflen); + if (cnt <= 4) + break; + ADDC(buf, buflen, '"'); + for (i = 4; i < cnt; i++) + ADDC(buf, buflen, data[i]); + ADDC(buf, buflen, '"'); + ADDC(buf, buflen, '\0'); + break; + + case KRB4_ENCPWD_AUTH: /* Authentication data follows */ + strncpy((char *)buf, " AUTH", buflen); + goto common2; + + case KRB4_ENCPWD_CHALLENGE: + strncpy((char *)buf, " CHALLENGE", buflen); + goto common2; + + case KRB4_ENCPWD_ACK: + strncpy((char *)buf, " ACK", buflen); + goto common2; + + default: + sprintf(lbuf, " %d (unknown)", data[3]); + strncpy((char *)buf, lbuf, buflen); + common2: + BUMP(buf, buflen); + for (i = 4; i < cnt; i++) { + sprintf(lbuf, " %d", data[i]); + strncpy((char *)buf, lbuf, buflen); + BUMP(buf, buflen); + } + break; + } +} + +int passwdok(name, passwd) +char *name, *passwd; +{ + char *crypt(); + char *salt, *p; + struct passwd *pwd; + int passwdok_status = 0; + + if (pwd = getpwnam(name)) + salt = pwd->pw_passwd; + else salt = "xx"; + + p = crypt(passwd, salt); + + if (pwd && !strcmp(p, pwd->pw_passwd)) { + passwdok_status = 1; + } else passwdok_status = 0; + return(passwdok_status); +} + +#endif -- cgit v1.2.3-56-ge451