/*- * 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