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
37 static const char sccsid[] = "@(#)auth.c 8.3 (Berkeley) 5/30/95";
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
45 * Copyright (C) 1990 by the Massachusetts Institute of Technology
47 * Export of this software from the United States of America is assumed
48 * to require a specific license from the United States Government.
49 * It is the responsibility of any person or organization contemplating
50 * export to obtain such a license before exporting.
52 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
53 * distribute this software and its documentation for any purpose and
54 * without fee is hereby granted, provided that the above copyright
55 * notice appear in all copies and that both that copyright notice and
56 * this permission notice appear in supporting documentation, and that
57 * the name of M.I.T. not be used in advertising or publicity pertaining
58 * to distribution of the software without specific, written prior
59 * permission. M.I.T. makes no representations about the suitability of
60 * this software for any purpose. It is provided "as is" without express
61 * or implied warranty.
67 #include <sys/types.h>
73 #include <arpa/telnet.h>
77 #include "misc-proto.h"
78 #include "auth-proto.h"
80 #define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0)
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 const 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[] = {
120 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
122 kerberos5_send_mutual,
126 kerberos5_printsub },
127 # endif /* ENCRYPTION */
128 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
130 kerberos5_send_oneway,
134 kerberos5_printsub },
138 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
144 kerberos4_printsub },
145 # endif /* ENCRYPTION */
146 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
152 kerberos4_printsub },
155 { AUTHTYPE_KRB4_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
161 krb4encpwd_printsub },
164 { AUTHTYPE_RSA_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
170 rsaencpwd_printsub },
173 { AUTHTYPE_SRA, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
182 { 0, 0, 0, 0, 0, 0, 0, 0 },
185 static Authenticator NoAuth = { 0, 0, 0, 0, 0, 0, 0, 0 };
187 static int i_support = 0;
188 static int i_wont_support = 0;
191 findauthenticator(int type, int way)
193 Authenticator *ap = authenticators;
195 while (ap->type && (ap->type != type || ap->way != way))
197 return(ap->type ? ap : 0);
201 auth_init(const char *name, int server)
203 Authenticator *ap = authenticators;
212 if (!ap->init || (*ap->init)(ap, server)) {
213 i_support |= typemask(ap->type);
215 printf(">>>%s: I support auth type %d %d\r\n",
219 else if (auth_debug_mode)
220 printf(">>>%s: Init failed: auth type %d %d\r\n",
221 Name, ap->type, ap->way);
227 auth_disable_name(char *name)
230 for (x = 0; x < AUTHTYPE_CNT; ++x) {
231 if (AUTHTYPE_NAME(x) && !strcasecmp(name, AUTHTYPE_NAME(x))) {
232 i_wont_support |= typemask(x);
239 getauthmask(char *type, int *maskp)
243 if (AUTHTYPE_NAME(0) && !strcasecmp(type, AUTHTYPE_NAME(0))) {
248 for (x = 1; x < AUTHTYPE_CNT; ++x) {
249 if (AUTHTYPE_NAME(x) && !strcasecmp(type, AUTHTYPE_NAME(x))) {
250 *maskp = typemask(x);
258 auth_enable(char *type)
260 return(auth_onoff(type, 1));
264 auth_disable(char *type)
266 return(auth_onoff(type, 0));
270 auth_onoff(char *type, int on)
275 if (!strcasecmp(type, "?") || !strcasecmp(type, "help")) {
276 printf("auth %s 'type'\n", on ? "enable" : "disable");
277 printf("Where 'type' is one of:\n");
278 printf("\t%s\n", AUTHTYPE_NAME(0));
280 for (ap = authenticators; ap->type; ap++) {
281 if ((mask & (i = typemask(ap->type))) != 0)
284 printf("\t%s\n", AUTHTYPE_NAME(ap->type));
289 if (!getauthmask(type, &mask)) {
290 printf("%s: invalid authentication type\n", type);
294 i_wont_support &= ~mask;
296 i_wont_support |= mask;
301 auth_togdebug(int on)
304 auth_debug_mode ^= 1;
306 auth_debug_mode = on;
307 printf("auth debugging %s\n", auth_debug_mode ? "enabled" : "disabled");
317 if (i_wont_support == -1)
318 printf("Authentication disabled\n");
320 printf("Authentication enabled\n");
323 for (ap = authenticators; ap->type; ap++) {
324 if ((mask & (i = typemask(ap->type))) != 0)
327 printf("%s: %s\n", AUTHTYPE_NAME(ap->type),
328 (i_wont_support & typemask(ap->type)) ?
329 "disabled" : "enabled");
335 * This routine is called by the server to start authentication
341 static unsigned char str_request[64] = { IAC, SB,
342 TELOPT_AUTHENTICATION,
344 Authenticator *ap = authenticators;
345 unsigned char *e = str_request + 4;
347 if (!authenticating) {
350 if (i_support & ~i_wont_support & typemask(ap->type)) {
351 if (auth_debug_mode) {
352 printf(">>>%s: Sending type %d %d\r\n",
353 Name, ap->type, ap->way);
362 net_write(str_request, e - str_request);
363 printsub('>', &str_request[2], e - str_request - 2);
368 * This is called when an AUTH SEND is received.
369 * It should never arrive on the server side (as only the server can
370 * send an AUTH SEND).
371 * You should probably respond to it if you can...
373 * If you want to respond to the types out of order (i.e. even
374 * if he sends LOGIN KERBEROS and you support both, you respond
375 * with KERBEROS instead of LOGIN (which is against what the
376 * protocol says)) you will have to hack this code...
379 auth_send(unsigned char *data, int cnt)
382 static unsigned char str_none[] = { IAC, SB, TELOPT_AUTHENTICATION,
383 TELQUAL_IS, AUTHTYPE_NULL, 0,
386 if (auth_debug_mode) {
387 printf(">>>%s: auth_send called!\r\n", Name);
392 if (auth_debug_mode) {
393 printf(">>>%s: auth_send got:", Name);
394 printd(data, cnt); printf("\r\n");
398 * Save the data, if it is new, so that we can continue looking
399 * at it if the authorization we try doesn't work
401 if (data < _auth_send_data ||
402 data > _auth_send_data + sizeof(_auth_send_data)) {
403 auth_send_cnt = (size_t)cnt > sizeof(_auth_send_data)
404 ? sizeof(_auth_send_data)
406 memmove((void *)_auth_send_data, (void *)data, auth_send_cnt);
407 auth_send_data = _auth_send_data;
410 * This is probably a no-op, but we just make sure
412 auth_send_data = data;
415 while ((auth_send_cnt -= 2) >= 0) {
417 printf(">>>%s: He supports %d\r\n",
418 Name, *auth_send_data);
419 if ((i_support & ~i_wont_support) & typemask(*auth_send_data)) {
420 ap = findauthenticator(auth_send_data[0],
422 if (ap && ap->send) {
424 printf(">>>%s: Trying %d %d\r\n",
425 Name, auth_send_data[0],
427 if ((*ap->send)(ap)) {
429 * Okay, we found one we like
431 * we can go home now.
434 printf(">>>%s: Using type %d\r\n",
435 Name, *auth_send_data);
441 * just continue on and look for the
442 * next one if we didn't do anything.
447 net_write(str_none, sizeof(str_none));
448 printsub('>', &str_none[2], sizeof(str_none) - 2);
450 printf(">>>%s: Sent failure message\r\n", Name);
451 auth_finished(0, AUTH_REJECT);
455 auth_send_retry(void)
458 * if auth_send_cnt <= 0 then auth_send will end up rejecting
459 * the authentication and informing the other side of this.
461 auth_send(auth_send_data, auth_send_cnt);
465 auth_is(unsigned char *data, int cnt)
472 if (data[0] == AUTHTYPE_NULL) {
473 auth_finished(0, AUTH_REJECT);
477 if ((ap = findauthenticator(data[0], data[1]))) {
479 (*ap->is)(ap, data+2, cnt-2);
480 } else if (auth_debug_mode)
481 printf(">>>%s: Invalid authentication in IS: %d\r\n",
486 auth_reply(unsigned char *data, int cnt)
493 if ((ap = findauthenticator(data[0], data[1]))) {
495 (*ap->reply)(ap, data+2, cnt-2);
496 } else if (auth_debug_mode)
497 printf(">>>%s: Invalid authentication in SEND: %d\r\n",
502 auth_name(unsigned char *data, int cnt)
504 unsigned char savename[256];
508 printf(">>>%s: Empty name in NAME\r\n", Name);
511 if ((size_t)cnt > sizeof(savename) - 1) {
513 printf(">>>%s: Name in NAME (%d) exceeds %d length\r\n",
514 Name, cnt, (u_int)sizeof(savename)-1);
517 memmove((void *)savename, (void *)data, cnt);
518 savename[cnt] = '\0'; /* Null terminate */
520 printf(">>>%s: Got NAME [%s]\r\n", Name, savename);
521 auth_encrypt_user(savename);
525 auth_sendname(unsigned char *cp, int len)
527 static unsigned char str_request[256+6]
528 = { IAC, SB, TELOPT_AUTHENTICATION, TELQUAL_NAME, };
529 unsigned char *e = str_request + 4;
530 unsigned char *ee = &str_request[sizeof(str_request)-2];
533 if ((*e++ = *cp++) == IAC)
540 net_write(str_request, e - str_request);
541 printsub('>', &str_request[2], e - &str_request[2]);
546 auth_finished(Authenticator *ap, int result)
548 if (!(authenticated = ap))
549 authenticated = &NoAuth;
555 auth_intr(int sig __unused)
557 auth_finished(0, AUTH_REJECT);
561 auth_wait(char *name)
564 printf(">>>%s: in auth_wait.\r\n", Name);
566 if (Server && !authenticating)
569 (void) signal(SIGALRM, auth_intr);
571 while (!authenticated)
575 (void) signal(SIGALRM, SIG_DFL);
578 * Now check to see if the user is valid or not
580 if (!authenticated || authenticated == &NoAuth)
583 if (validuser == AUTH_VALID)
584 validuser = AUTH_USER;
586 if (authenticated->status)
587 validuser = (*authenticated->status)(authenticated,
593 auth_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
597 if ((ap = findauthenticator(data[1], data[2])) && ap->printsub)
598 (*ap->printsub)(data, cnt, buf, buflen);
600 auth_gen_printsub(data, cnt, buf, buflen);
604 auth_gen_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
607 unsigned char tbuf[16];
611 buf[buflen-1] = '\0';
614 for (; cnt > 0; cnt--, data++) {
615 sprintf((char *)tbuf, " %d", *data);
616 for (cp = tbuf; *cp && buflen > 0; --buflen)