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
33 * $FreeBSD: src/crypto/telnet/libtelnet/auth.c,v 1.3.2.5 2002/04/13 10:59:07 markm Exp $
35 * @(#)auth.c 8.3 (Berkeley) 5/30/95
36 * $FreeBSD: src/crypto/telnet/libtelnet/auth.c,v 1.3.2.5 2002/04/13 10:59:07 markm Exp $
40 * Copyright (C) 1990 by the Massachusetts Institute of Technology
42 * Export of this software from the United States of America is assumed
43 * to require a specific license from the United States Government.
44 * It is the responsibility of any person or organization contemplating
45 * export to obtain such a license before exporting.
47 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
48 * distribute this software and its documentation for any purpose and
49 * without fee is hereby granted, provided that the above copyright
50 * notice appear in all copies and that both that copyright notice and
51 * this permission notice appear in supporting documentation, and that
52 * the name of M.I.T. not be used in advertising or publicity pertaining
53 * to distribution of the software without specific, written prior
54 * permission. M.I.T. makes no representations about the suitability of
55 * this software for any purpose. It is provided "as is" without express
56 * or implied warranty.
62 #include <sys/types.h>
68 #include <arpa/telnet.h>
72 #include "misc-proto.h"
73 #include "auth-proto.h"
75 #define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0)
78 extern krb4encpwd_init();
79 extern krb4encpwd_send();
80 extern krb4encpwd_is();
81 extern krb4encpwd_reply();
82 extern krb4encpwd_status();
83 extern krb4encpwd_printsub();
87 extern rsaencpwd_init();
88 extern rsaencpwd_send();
89 extern rsaencpwd_is();
90 extern rsaencpwd_reply();
91 extern rsaencpwd_status();
92 extern rsaencpwd_printsub();
95 int auth_debug_mode = 0;
96 static const char *Name = "Noname";
97 static int Server = 0;
98 static Authenticator *authenticated = NULL;
99 static int authenticating = 0;
100 static int validuser = 0;
101 static unsigned char _auth_send_data[256];
102 static unsigned char *auth_send_data;
103 static int auth_send_cnt = 0;
105 int auth_onoff(char *type, int on);
106 void auth_encrypt_user(char *name);
109 * Authentication types supported. Plese note that these are stored
110 * in priority order, i.e. try the first one first.
112 Authenticator authenticators[] = {
115 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
117 kerberos5_send_mutual,
121 kerberos5_printsub },
122 # endif /* ENCRYPTION */
123 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
125 kerberos5_send_oneway,
129 kerberos5_printsub },
133 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
139 kerberos4_printsub },
140 # endif /* ENCRYPTION */
141 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
147 kerberos4_printsub },
150 { AUTHTYPE_KRB4_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
156 krb4encpwd_printsub },
159 { AUTHTYPE_RSA_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
165 rsaencpwd_printsub },
168 { AUTHTYPE_SRA, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
177 { 0, 0, 0, 0, 0, 0, 0, 0 },
180 static Authenticator NoAuth = { 0, 0, 0, 0, 0, 0, 0, 0 };
182 static int i_support = 0;
183 static int i_wont_support = 0;
186 findauthenticator(int type, int way)
188 Authenticator *ap = authenticators;
190 while (ap->type && (ap->type != type || ap->way != way))
192 return(ap->type ? ap : 0);
196 auth_init(const char *name, int server)
198 Authenticator *ap = authenticators;
204 authenticated = NULL;
207 if (!ap->init || (*ap->init)(ap, server)) {
208 i_support |= typemask(ap->type);
210 printf(">>>%s: I support auth type %d %d\r\n",
214 else if (auth_debug_mode)
215 printf(">>>%s: Init failed: auth type %d %d\r\n",
216 Name, ap->type, ap->way);
222 auth_disable_name(char *name)
225 for (x = 0; x < AUTHTYPE_CNT; ++x) {
226 if (AUTHTYPE_NAME(x) && !strcasecmp(name, AUTHTYPE_NAME(x))) {
227 i_wont_support |= typemask(x);
234 getauthmask(char *type, int *maskp)
238 if (AUTHTYPE_NAME(0) && !strcasecmp(type, AUTHTYPE_NAME(0))) {
243 for (x = 1; x < AUTHTYPE_CNT; ++x) {
244 if (AUTHTYPE_NAME(x) && !strcasecmp(type, AUTHTYPE_NAME(x))) {
245 *maskp = typemask(x);
253 auth_enable(char *type)
255 return(auth_onoff(type, 1));
259 auth_disable(char *type)
261 return(auth_onoff(type, 0));
265 auth_onoff(char *type, int on)
270 if (!strcasecmp(type, "?") || !strcasecmp(type, "help")) {
271 printf("auth %s 'type'\n", on ? "enable" : "disable");
272 printf("Where 'type' is one of:\n");
273 printf("\t%s\n", AUTHTYPE_NAME(0));
275 for (ap = authenticators; ap->type; ap++) {
276 if ((mask & (i = typemask(ap->type))) != 0)
279 printf("\t%s\n", AUTHTYPE_NAME(ap->type));
284 if (!getauthmask(type, &mask)) {
285 printf("%s: invalid authentication type\n", type);
289 i_wont_support &= ~mask;
291 i_wont_support |= mask;
296 auth_togdebug(int on)
299 auth_debug_mode ^= 1;
301 auth_debug_mode = on;
302 printf("auth debugging %s\n", auth_debug_mode ? "enabled" : "disabled");
312 if (i_wont_support == -1)
313 printf("Authentication disabled\n");
315 printf("Authentication enabled\n");
318 for (ap = authenticators; ap->type; ap++) {
319 if ((mask & (i = typemask(ap->type))) != 0)
322 printf("%s: %s\n", AUTHTYPE_NAME(ap->type),
323 (i_wont_support & typemask(ap->type)) ?
324 "disabled" : "enabled");
330 * This routine is called by the server to start authentication
336 static unsigned char str_request[64] = { IAC, SB,
337 TELOPT_AUTHENTICATION,
339 Authenticator *ap = authenticators;
340 unsigned char *e = str_request + 4;
342 if (!authenticating) {
345 if (i_support & ~i_wont_support & typemask(ap->type)) {
346 if (auth_debug_mode) {
347 printf(">>>%s: Sending type %d %d\r\n",
348 Name, ap->type, ap->way);
357 net_write(str_request, e - str_request);
358 printsub('>', &str_request[2], e - str_request - 2);
363 * This is called when an AUTH SEND is received.
364 * It should never arrive on the server side (as only the server can
365 * send an AUTH SEND).
366 * You should probably respond to it if you can...
368 * If you want to respond to the types out of order (i.e. even
369 * if he sends LOGIN KERBEROS and you support both, you respond
370 * with KERBEROS instead of LOGIN (which is against what the
371 * protocol says)) you will have to hack this code...
374 auth_send(unsigned char *data, int cnt)
377 static unsigned char str_none[] = { IAC, SB, TELOPT_AUTHENTICATION,
378 TELQUAL_IS, AUTHTYPE_NULL, 0,
381 if (auth_debug_mode) {
382 printf(">>>%s: auth_send called!\r\n", Name);
387 if (auth_debug_mode) {
388 printf(">>>%s: auth_send got:", Name);
389 printd(data, cnt); printf("\r\n");
393 * Save the data, if it is new, so that we can continue looking
394 * at it if the authorization we try doesn't work
396 if (data < _auth_send_data ||
397 data > _auth_send_data + sizeof(_auth_send_data)) {
398 auth_send_cnt = (size_t)cnt > sizeof(_auth_send_data)
399 ? sizeof(_auth_send_data)
401 memmove((void *)_auth_send_data, (void *)data, auth_send_cnt);
402 auth_send_data = _auth_send_data;
405 * This is probably a no-op, but we just make sure
407 auth_send_data = data;
410 while ((auth_send_cnt -= 2) >= 0) {
412 printf(">>>%s: He supports %d\r\n",
413 Name, *auth_send_data);
414 if ((i_support & ~i_wont_support) & typemask(*auth_send_data)) {
415 ap = findauthenticator(auth_send_data[0],
417 if (ap && ap->send) {
419 printf(">>>%s: Trying %d %d\r\n",
420 Name, auth_send_data[0],
422 if ((*ap->send)(ap)) {
424 * Okay, we found one we like
426 * we can go home now.
429 printf(">>>%s: Using type %d\r\n",
430 Name, *auth_send_data);
436 * just continue on and look for the
437 * next one if we didn't do anything.
442 net_write(str_none, sizeof(str_none));
443 printsub('>', &str_none[2], sizeof(str_none) - 2);
445 printf(">>>%s: Sent failure message\r\n", Name);
446 auth_finished(0, AUTH_REJECT);
450 auth_send_retry(void)
453 * if auth_send_cnt <= 0 then auth_send will end up rejecting
454 * the authentication and informing the other side of this.
456 auth_send(auth_send_data, auth_send_cnt);
460 auth_is(unsigned char *data, int cnt)
467 if (data[0] == AUTHTYPE_NULL) {
468 auth_finished(0, AUTH_REJECT);
472 if ((ap = findauthenticator(data[0], data[1]))) {
474 (*ap->is)(ap, data+2, cnt-2);
475 } else if (auth_debug_mode)
476 printf(">>>%s: Invalid authentication in IS: %d\r\n",
481 auth_reply(unsigned char *data, int cnt)
488 if ((ap = findauthenticator(data[0], data[1]))) {
490 (*ap->reply)(ap, data+2, cnt-2);
491 } else if (auth_debug_mode)
492 printf(">>>%s: Invalid authentication in SEND: %d\r\n",
497 auth_name(unsigned char *data, int cnt)
499 unsigned char savename[256];
503 printf(">>>%s: Empty name in NAME\r\n", Name);
506 if ((size_t)cnt > sizeof(savename) - 1) {
508 printf(">>>%s: Name in NAME (%d) exceeds %d length\r\n",
509 Name, cnt, (u_int)sizeof(savename)-1);
512 memmove((void *)savename, (void *)data, cnt);
513 savename[cnt] = '\0'; /* Null terminate */
515 printf(">>>%s: Got NAME [%s]\r\n", Name, savename);
516 auth_encrypt_user(savename);
520 auth_sendname(unsigned char *cp, int len)
522 static unsigned char str_request[256+6]
523 = { IAC, SB, TELOPT_AUTHENTICATION, TELQUAL_NAME, };
524 unsigned char *e = str_request + 4;
525 unsigned char *ee = &str_request[sizeof(str_request)-2];
528 if ((*e++ = *cp++) == IAC)
535 net_write(str_request, e - str_request);
536 printsub('>', &str_request[2], e - &str_request[2]);
541 auth_finished(Authenticator *ap, int result)
543 if (!(authenticated = ap))
544 authenticated = &NoAuth;
550 auth_intr(int sig __unused)
552 auth_finished(0, AUTH_REJECT);
556 auth_wait(char *name)
559 printf(">>>%s: in auth_wait.\r\n", Name);
561 if (Server && !authenticating)
564 (void) signal(SIGALRM, auth_intr);
566 while (!authenticated)
570 (void) signal(SIGALRM, SIG_DFL);
573 * Now check to see if the user is valid or not
575 if (!authenticated || authenticated == &NoAuth)
578 if (validuser == AUTH_VALID)
579 validuser = AUTH_USER;
581 if (authenticated->status)
582 validuser = (*authenticated->status)(authenticated,
588 auth_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
592 if ((ap = findauthenticator(data[1], data[2])) && ap->printsub)
593 (*ap->printsub)(data, cnt, buf, buflen);
595 auth_gen_printsub(data, cnt, buf, buflen);
599 auth_gen_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
602 unsigned char tbuf[16];
606 buf[buflen-1] = '\0';
609 for (; cnt > 0; cnt--, data++) {
610 sprintf((char *)tbuf, " %d", *data);
611 for (cp = tbuf; *cp && buflen > 0; --buflen)