diff options
Diffstat (limited to 'crypto/telnet/libtelnet/kerberos.c')
| -rw-r--r-- | crypto/telnet/libtelnet/kerberos.c | 506 |
1 files changed, 0 insertions, 506 deletions
diff --git a/crypto/telnet/libtelnet/kerberos.c b/crypto/telnet/libtelnet/kerberos.c deleted file mode 100644 index 2380c27..0000000 --- a/crypto/telnet/libtelnet/kerberos.c +++ /dev/null @@ -1,506 +0,0 @@ -/*- - * Copyright (c) 1991, 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 <sys/cdefs.h> - -__FBSDID("$FreeBSD$"); - -#ifndef lint -static const char sccsid[] = "@(#)kerberos.c 8.3 (Berkeley) 5/30/95"; -#endif /* not lint */ - -/* - * Copyright (C) 1990 by the Massachusetts Institute of Technology - * - * Export of this software from the United States of America is assumed - * to require a specific license from the United States Government. - * It is the responsibility of any person or organization contemplating - * export to obtain such a license before exporting. - * - * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and - * distribute this software and its documentation for any purpose and - * without fee is hereby granted, provided that the above copyright - * notice appear in all copies and that both that copyright notice and - * this permission notice appear in supporting documentation, and that - * the name of M.I.T. not be used in advertising or publicity pertaining - * to distribution of the software without specific, written prior - * permission. M.I.T. makes no representations about the suitability of - * this software for any purpose. It is provided "as is" without express - * or implied warranty. - */ - -#ifdef KRB4 -#include <sys/types.h> -#include <arpa/telnet.h> -#include <openssl/des.h> /* BSD wont include this in krb.h, so we do it here */ -#include <krb.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "encrypt.h" -#include "auth.h" -#include "misc.h" - -int kerberos4_cksum(unsigned char *, int); -int kuserok(AUTH_DAT *, char *); - -extern int auth_debug_mode; - -static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0, - AUTHTYPE_KERBEROS_V4, }; - -#define KRB_AUTH 0 /* Authentication data follows */ -#define KRB_REJECT 1 /* Rejected (reason might follow) */ -#define KRB_ACCEPT 2 /* Accepted */ -#define KRB_CHALLENGE 3 /* Challenge for mutual auth. */ -#define KRB_RESPONSE 4 /* Response for mutual auth. */ - -static KTEXT_ST auth; -static char name[ANAME_SZ]; -static AUTH_DAT adat = { 0, "", "", "", 0, {}, 0, 0, 0, { 0, "", 0 } }; -#ifdef ENCRYPTION -static Block session_key = { 0 }; -static des_key_schedule sched; -static Block challenge = { 0 }; -#endif /* ENCRYPTION */ - -static char krb_service_name[] = "rcmd"; -static char empty[] = ""; - -static int -Data(Authenticator *ap, int type, const unsigned char *d, int c) -{ - unsigned char *p = str_data + 4; - const unsigned char *cd = d; - - if (c == -1) - c = strlen(cd); - - if (auth_debug_mode) { - 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 -kerberos4_init(Authenticator *ap __unused, int server) -{ - FILE *fp; - - if (server) { - str_data[3] = TELQUAL_REPLY; - if ((fp = fopen(KEYFILE, "r")) == NULL) - return(0); - fclose(fp); - } else { - str_data[3] = TELQUAL_IS; - } - return(1); -} - -char dst_realm_buf[REALM_SZ], *dest_realm = NULL; -int dst_realm_sz = REALM_SZ; - -int -kerberos4_send(Authenticator *ap) -{ - KTEXT_ST lauth; - char instance[INST_SZ]; - char *realm; - CREDENTIALS cred; - int r; - - printf("[ Trying KERBEROS4 ... ]\n"); - if (!UserNameRequested) { - if (auth_debug_mode) { - printf("Kerberos V4: no user name supplied\r\n"); - } - return(0); - } - - memset(instance, 0, sizeof(instance)); - - if ((realm = krb_get_phost(RemoteHostName))) - strncpy(instance, realm, sizeof(instance)); - - instance[sizeof(instance)-1] = '\0'; - - realm = dest_realm ? dest_realm : krb_realmofhost(RemoteHostName); - - if (!realm) { - printf("Kerberos V4: no realm for %s\r\n", RemoteHostName); - return(0); - } - if ((r = krb_mk_req(&lauth, krb_service_name, instance, realm, 0L))) { - printf("mk_req failed: %s\r\n", krb_err_txt[r]); - return(0); - } - if ((r = krb_get_cred(krb_service_name, instance, realm, &cred))) { - printf("get_cred failed: %s\r\n", krb_err_txt[r]); - return(0); - } - if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) { - if (auth_debug_mode) - printf("Not enough room for user name\r\n"); - return(0); - } - if (auth_debug_mode) - printf("Sent %d bytes of authentication data\r\n", lauth.length); - if (!Data(ap, KRB_AUTH, (void *)lauth.dat, lauth.length)) { - if (auth_debug_mode) - printf("Not enough room for authentication data\r\n"); - return(0); - } -#ifdef ENCRYPTION - /* - * 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; - - des_key_sched(&cred.session, sched); - des_random_key(&session_key); - des_ecb_encrypt(&session_key, &session_key, sched, 0); - des_ecb_encrypt(&session_key, &challenge, sched, 0); - /* - * Increment the challenge by 1, and encrypt it for - * later comparison. - */ - for (i = 7; i >= 0; --i) { - register int x; - x = (unsigned int)challenge[i] + 1; - challenge[i] = x; /* ignore overflow */ - if (x < 256) /* if no overflow, all done */ - break; - } - des_ecb_encrypt(&challenge, &challenge, sched, 1); - } -#endif /* ENCRYPTION */ - - if (auth_debug_mode) { - printf("CK: %d:", kerberos4_cksum(lauth.dat, lauth.length)); - printd(lauth.dat, lauth.length); - printf("\r\n"); - printf("Sent Kerberos V4 credentials to server\r\n"); - } - return(1); -} - -void -kerberos4_is(Authenticator *ap, unsigned char *data, int cnt) -{ -#ifdef ENCRYPTION - Session_Key skey; - Block datablock; -#endif /* ENCRYPTION */ - char realm[REALM_SZ]; - char instance[INST_SZ]; - int r; - - if (cnt-- < 1) - return; - switch (*data++) { - case KRB_AUTH: - if (krb_get_lrealm(realm, 1) != KSUCCESS) { - Data(ap, KRB_REJECT, "No local V4 Realm.", -1); - auth_finished(ap, AUTH_REJECT); - if (auth_debug_mode) - printf("No local realm\r\n"); - return; - } - memmove((void *)auth.dat, (void *)data, auth.length = cnt); - if (auth_debug_mode) { - printf("Got %d bytes of authentication data\r\n", cnt); - printf("CK: %d:", kerberos4_cksum(auth.dat, auth.length)); - printd(auth.dat, auth.length); - printf("\r\n"); - } - instance[0] = '*'; instance[1] = 0; - if ((r = krb_rd_req(&auth, krb_service_name, - instance, 0, &adat, empty))) { - if (auth_debug_mode) - printf("Kerberos failed him as %s\r\n", name); - Data(ap, KRB_REJECT, krb_err_txt[r], -1); - auth_finished(ap, AUTH_REJECT); - return; - } -#ifdef ENCRYPTION - memmove((void *)session_key, (void *)adat.session, sizeof(Block)); -#endif /* ENCRYPTION */ - krb_kntoln(&adat, name); - - if (UserNameRequested && !kuserok(&adat, UserNameRequested)) - Data(ap, KRB_ACCEPT, NULL, 0); - else - Data(ap, KRB_REJECT, "user is not authorized", -1); - auth_finished(ap, AUTH_USER); - break; - - case KRB_CHALLENGE: -#ifndef ENCRYPTION - Data(ap, KRB_RESPONSE, NULL, 0); -#else /* ENCRYPTION */ - if (!VALIDKEY(session_key)) { - /* - * We don't have a valid session key, so just - * send back a response with an empty session - * key. - */ - Data(ap, KRB_RESPONSE, NULL, 0); - break; - } - - des_key_sched(&session_key, sched); - memmove((void *)datablock, (void *)data, sizeof(Block)); - /* - * Take the received encrypted challenge, and encrypt - * it again to get a unique session_key for the - * ENCRYPT option. - */ - des_ecb_encrypt(&datablock, &session_key, sched, 1); - skey.type = SK_DES; - skey.length = 8; - skey.data = session_key; - encrypt_session_key(&skey, 1); - /* - * Now decrypt the received encrypted challenge, - * increment by one, re-encrypt it and send it back. - */ - des_ecb_encrypt(&datablock, &challenge, sched, 0); - for (r = 7; r >= 0; r--) { - register int t; - t = (unsigned int)challenge[r] + 1; - challenge[r] = t; /* ignore overflow */ - if (t < 256) /* if no overflow, all done */ - break; - } - des_ecb_encrypt(&challenge, &challenge, sched, 1); - Data(ap, KRB_RESPONSE, challenge, sizeof(challenge)); -#endif /* ENCRYPTION */ - break; - - default: - if (auth_debug_mode) - printf("Unknown Kerberos option %d\r\n", data[-1]); - Data(ap, KRB_REJECT, NULL, 0); - break; - } -} - -void -kerberos4_reply(Authenticator *ap, unsigned char *data, int cnt) -{ -#ifdef ENCRYPTION - Session_Key skey; -#endif /* ENCRYPTION */ - - if (cnt-- < 1) - return; - switch (*data++) { - case KRB_REJECT: - if (cnt > 0) { - printf("[ Kerberos V4 refuses authentication because %.*s ]\r\n", - cnt, data); - } else - printf("[ Kerberos V4 refuses authentication ]\r\n"); - auth_send_retry(); - return; - case KRB_ACCEPT: - printf("[ Kerberos V4 accepts you ]\n"); - if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) { - /* - * Send over the encrypted challenge. - */ -#ifndef ENCRYPTION - Data(ap, KRB_CHALLENGE, NULL, 0); -#else /* ENCRYPTION */ - Data(ap, KRB_CHALLENGE, session_key, - sizeof(session_key)); - des_ecb_encrypt(&session_key, &session_key, sched, 1); - skey.type = SK_DES; - skey.length = 8; - skey.data = session_key; - encrypt_session_key(&skey, 0); -#endif /* ENCRYPTION */ - return; - } - auth_finished(ap, AUTH_USER); - return; - case KRB_RESPONSE: -#ifdef ENCRYPTION - /* - * Verify that the response to the challenge is correct. - */ - if ((cnt != sizeof(Block)) || - (0 != memcmp((void *)data, (void *)challenge, - sizeof(challenge)))) - { -#endif /* ENCRYPTION */ - printf("[ Kerberos V4 challenge failed!!! ]\r\n"); - auth_send_retry(); - return; -#ifdef ENCRYPTION - } - printf("[ Kerberos V4 challenge successful ]\r\n"); - auth_finished(ap, AUTH_USER); -#endif /* ENCRYPTION */ - break; - default: - if (auth_debug_mode) - printf("Unknown Kerberos option %d\r\n", data[-1]); - return; - } -} - -int -kerberos4_status(Authenticator *ap __unused, char *nam, int level) -{ - if (level < AUTH_USER) - return(level); - - if (UserNameRequested && !kuserok(&adat, UserNameRequested)) { - strcpy(nam, 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 -kerberos4_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen) -{ - char lbuf[32]; - register int i; - - buf[buflen-1] = '\0'; /* make sure its NULL terminated */ - buflen -= 1; - - switch(data[3]) { - case KRB_REJECT: /* Rejected (reason might follow) */ - strncpy((char *)buf, " REJECT ", buflen); - goto common; - - case KRB_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 KRB_AUTH: /* Authentication data follows */ - strncpy((char *)buf, " AUTH", buflen); - goto common2; - - case KRB_CHALLENGE: - strncpy((char *)buf, " CHALLENGE", buflen); - goto common2; - - case KRB_RESPONSE: - strncpy((char *)buf, " RESPONSE", 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 -kerberos4_cksum(unsigned char *d, int n) -{ - int ck = 0; - - /* - * A comment is probably needed here for those not - * well versed in the "C" language. Yes, this is - * supposed to be a "switch" with the body of the - * "switch" being a "while" statement. The whole - * purpose of the switch is to allow us to jump into - * the middle of the while() loop, and then not have - * to do any more switch()s. - * - * Some compilers will spit out a warning message - * about the loop not being entered at the top. - */ - switch (n&03) - while (n > 0) { - case 0: - ck ^= (int)*d++ << 24; - --n; - case 3: - ck ^= (int)*d++ << 16; - --n; - case 2: - ck ^= (int)*d++ << 8; - --n; - case 1: - ck ^= (int)*d++; - --n; - } - return(ck); -} -#endif |
