2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static const char sccsid[] = "@(#)auth.c 8.3 (Berkeley) 5/30/95";
39 * Copyright (C) 1990 by the Massachusetts Institute of Technology
41 * Export of this software from the United States of America is assumed
42 * to require a specific license from the United States Government.
43 * It is the responsibility of any person or organization contemplating
44 * export to obtain such a license before exporting.
46 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
47 * distribute this software and its documentation for any purpose and
48 * without fee is hereby granted, provided that the above copyright
49 * notice appear in all copies and that both that copyright notice and
50 * this permission notice appear in supporting documentation, and that
51 * the name of M.I.T. not be used in advertising or publicity pertaining
52 * to distribution of the software without specific, written prior
53 * permission. M.I.T. makes no representations about the suitability of
54 * this software for any purpose. It is provided "as is" without express
55 * or implied warranty.
59 #if defined(AUTHENTICATION)
61 #include <sys/types.h>
64 #include <arpa/telnet.h>
77 #include "misc-proto.h"
78 #include "auth-proto.h"
80 #define typemask(x) (1<<((x)-1))
83 extern krb4encpwd_init();
84 extern krb4encpwd_send();
85 extern krb4encpwd_is();
86 extern krb4encpwd_reply();
87 extern krb4encpwd_status();
88 extern krb4encpwd_printsub();
92 extern rsaencpwd_init();
93 extern rsaencpwd_send();
94 extern rsaencpwd_is();
95 extern rsaencpwd_reply();
96 extern rsaencpwd_status();
97 extern rsaencpwd_printsub();
100 int auth_debug_mode = 0;
101 static char *Name = "Noname";
102 static int Server = 0;
103 static Authenticator *authenticated = 0;
104 static int authenticating = 0;
105 static int validuser = 0;
106 static unsigned char _auth_send_data[256];
107 static unsigned char *auth_send_data;
108 static int auth_send_cnt = 0;
110 int auth_onoff(char *type, int on);
111 void auth_encrypt_user(char *name);
114 * Authentication types supported. Plese note that these are stored
115 * in priority order, i.e. try the first one first.
117 Authenticator authenticators[] = {
119 { AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
126 { AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
136 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
142 kerberos5_printsub },
143 # endif /* ENCRYPTION */
144 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
150 kerberos5_printsub },
154 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
160 kerberos4_printsub },
161 # endif /* ENCRYPTION */
162 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
168 kerberos4_printsub },
171 { AUTHTYPE_KRB4_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
177 krb4encpwd_printsub },
180 { AUTHTYPE_RSA_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
186 rsaencpwd_printsub },
189 { AUTHTYPE_SRA, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
201 static Authenticator NoAuth = { 0 };
203 static int i_support = 0;
204 static int i_wont_support = 0;
207 findauthenticator(type, way)
211 Authenticator *ap = authenticators;
213 while (ap->type && (ap->type != type || ap->way != way))
215 return(ap->type ? ap : 0);
219 auth_init(name, server)
223 Authenticator *ap = authenticators;
232 if (!ap->init || (*ap->init)(ap, server)) {
233 i_support |= typemask(ap->type);
235 printf(">>>%s: I support auth type %d %d\r\n",
239 else if (auth_debug_mode)
240 printf(">>>%s: Init failed: auth type %d %d\r\n",
241 Name, ap->type, ap->way);
247 auth_disable_name(name)
251 for (x = 0; x < AUTHTYPE_CNT; ++x) {
252 if (!strcasecmp(name, AUTHTYPE_NAME(x))) {
253 i_wont_support |= typemask(x);
260 getauthmask(type, maskp)
266 if (!strcasecmp(type, AUTHTYPE_NAME(0))) {
271 for (x = 1; x < AUTHTYPE_CNT; ++x) {
272 if (!strcasecmp(type, AUTHTYPE_NAME(x))) {
273 *maskp = typemask(x);
284 return(auth_onoff(type, 1));
291 return(auth_onoff(type, 0));
302 if (!strcasecmp(type, "?") || !strcasecmp(type, "help")) {
303 printf("auth %s 'type'\n", on ? "enable" : "disable");
304 printf("Where 'type' is one of:\n");
305 printf("\t%s\n", AUTHTYPE_NAME(0));
307 for (ap = authenticators; ap->type; ap++) {
308 if ((mask & (i = typemask(ap->type))) != 0)
311 printf("\t%s\n", AUTHTYPE_NAME(ap->type));
316 if (!getauthmask(type, &mask)) {
317 printf("%s: invalid authentication type\n", type);
321 i_wont_support &= ~mask;
323 i_wont_support |= mask;
332 auth_debug_mode ^= 1;
334 auth_debug_mode = on;
335 printf("auth debugging %s\n", auth_debug_mode ? "enabled" : "disabled");
345 if (i_wont_support == -1)
346 printf("Authentication disabled\n");
348 printf("Authentication enabled\n");
351 for (ap = authenticators; ap->type; ap++) {
352 if ((mask & (i = typemask(ap->type))) != 0)
355 printf("%s: %s\n", AUTHTYPE_NAME(ap->type),
356 (i_wont_support & typemask(ap->type)) ?
357 "disabled" : "enabled");
363 * This routine is called by the server to start authentication
369 static unsigned char str_request[64] = { IAC, SB,
370 TELOPT_AUTHENTICATION,
372 Authenticator *ap = authenticators;
373 unsigned char *e = str_request + 4;
375 if (!authenticating) {
378 if (i_support & ~i_wont_support & typemask(ap->type)) {
379 if (auth_debug_mode) {
380 printf(">>>%s: Sending type %d %d\r\n",
381 Name, ap->type, ap->way);
390 net_write(str_request, e - str_request);
391 printsub('>', &str_request[2], e - str_request - 2);
396 * This is called when an AUTH SEND is received.
397 * It should never arrive on the server side (as only the server can
398 * send an AUTH SEND).
399 * You should probably respond to it if you can...
401 * If you want to respond to the types out of order (i.e. even
402 * if he sends LOGIN KERBEROS and you support both, you respond
403 * with KERBEROS instead of LOGIN (which is against what the
404 * protocol says)) you will have to hack this code...
412 static unsigned char str_none[] = { IAC, SB, TELOPT_AUTHENTICATION,
413 TELQUAL_IS, AUTHTYPE_NULL, 0,
416 if (auth_debug_mode) {
417 printf(">>>%s: auth_send called!\r\n", Name);
422 if (auth_debug_mode) {
423 printf(">>>%s: auth_send got:", Name);
424 printd(data, cnt); printf("\r\n");
428 * Save the data, if it is new, so that we can continue looking
429 * at it if the authorization we try doesn't work
431 if (data < _auth_send_data ||
432 data > _auth_send_data + sizeof(_auth_send_data)) {
433 auth_send_cnt = cnt > sizeof(_auth_send_data)
434 ? sizeof(_auth_send_data)
436 memmove((void *)_auth_send_data, (void *)data, auth_send_cnt);
437 auth_send_data = _auth_send_data;
440 * This is probably a no-op, but we just make sure
442 auth_send_data = data;
445 while ((auth_send_cnt -= 2) >= 0) {
447 printf(">>>%s: He supports %d\r\n",
448 Name, *auth_send_data);
449 if ((i_support & ~i_wont_support) & typemask(*auth_send_data)) {
450 ap = findauthenticator(auth_send_data[0],
452 if (ap && ap->send) {
454 printf(">>>%s: Trying %d %d\r\n",
455 Name, auth_send_data[0],
457 if ((*ap->send)(ap)) {
459 * Okay, we found one we like
461 * we can go home now.
464 printf(">>>%s: Using type %d\r\n",
465 Name, *auth_send_data);
471 * just continue on and look for the
472 * next one if we didn't do anything.
477 net_write(str_none, sizeof(str_none));
478 printsub('>', &str_none[2], sizeof(str_none) - 2);
480 printf(">>>%s: Sent failure message\r\n", Name);
481 auth_finished(0, AUTH_REJECT);
484 * We requested strong authentication, however no mechanisms worked.
485 * Therefore, exit on client end.
487 printf("Unable to securely authenticate user ... exit\n");
496 * if auth_send_cnt <= 0 then auth_send will end up rejecting
497 * the authentication and informing the other side of this.
499 auth_send(auth_send_data, auth_send_cnt);
512 if (data[0] == AUTHTYPE_NULL) {
513 auth_finished(0, AUTH_REJECT);
517 if ((ap = findauthenticator(data[0], data[1]))) {
519 (*ap->is)(ap, data+2, cnt-2);
520 } else if (auth_debug_mode)
521 printf(">>>%s: Invalid authentication in IS: %d\r\n",
526 auth_reply(data, cnt)
535 if ((ap = findauthenticator(data[0], data[1]))) {
537 (*ap->reply)(ap, data+2, cnt-2);
538 } else if (auth_debug_mode)
539 printf(">>>%s: Invalid authentication in SEND: %d\r\n",
548 unsigned char savename[256];
552 printf(">>>%s: Empty name in NAME\r\n", Name);
555 if (cnt > sizeof(savename) - 1) {
557 printf(">>>%s: Name in NAME (%d) exceeds %d length\r\n",
558 Name, cnt, sizeof(savename)-1);
561 memmove((void *)savename, (void *)data, cnt);
562 savename[cnt] = '\0'; /* Null terminate */
564 printf(">>>%s: Got NAME [%s]\r\n", Name, savename);
565 auth_encrypt_user(savename);
569 auth_sendname(cp, len)
573 static unsigned char str_request[256+6]
574 = { IAC, SB, TELOPT_AUTHENTICATION, TELQUAL_NAME, };
575 register unsigned char *e = str_request + 4;
576 register unsigned char *ee = &str_request[sizeof(str_request)-2];
579 if ((*e++ = *cp++) == IAC)
586 net_write(str_request, e - str_request);
587 printsub('>', &str_request[2], e - &str_request[2]);
592 auth_finished(ap, result)
596 if (!(authenticated = ap))
597 authenticated = &NoAuth;
606 auth_finished(0, AUTH_REJECT);
614 printf(">>>%s: in auth_wait.\r\n", Name);
616 if (Server && !authenticating)
619 (void) signal(SIGALRM, auth_intr);
621 while (!authenticated)
625 (void) signal(SIGALRM, SIG_DFL);
628 * Now check to see if the user is valid or not
630 if (!authenticated || authenticated == &NoAuth)
633 if (validuser == AUTH_VALID)
634 validuser = AUTH_USER;
636 if (authenticated->status)
637 validuser = (*authenticated->status)(authenticated,
646 auth_debug_mode = mode;
650 auth_printsub(data, cnt, buf, buflen)
651 unsigned char *data, *buf;
656 if ((ap = findauthenticator(data[1], data[2])) && ap->printsub)
657 (*ap->printsub)(data, cnt, buf, buflen);
659 auth_gen_printsub(data, cnt, buf, buflen);
663 auth_gen_printsub(data, cnt, buf, buflen)
664 unsigned char *data, *buf;
667 register unsigned char *cp;
668 unsigned char tbuf[16];
672 buf[buflen-1] = '\0';
675 for (; cnt > 0; cnt--, data++) {
676 sprintf((char *)tbuf, " %d", *data);
677 for (cp = tbuf; *cp && buflen > 0; --buflen)