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
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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 * Copyright (C) 1990 by the Massachusetts Institute of Technology
37 * Export of this software from the United States of America is assumed
38 * to require a specific license from the United States Government.
39 * It is the responsibility of any person or organization contemplating
40 * export to obtain such a license before exporting.
42 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
43 * distribute this software and its documentation for any purpose and
44 * without fee is hereby granted, provided that the above copyright
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47 * the name of M.I.T. not be used in advertising or publicity pertaining
48 * to distribution of the software without specific, written prior
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51 * or implied warranty.
58 #if defined(AUTHENTICATION)
60 #ifdef HAVE_SYS_TYPES_H
61 #include <sys/types.h>
65 #ifdef HAVE_ARPA_TELNET_H
66 #include <arpa/telnet.h>
79 #include "misc-proto.h"
80 #include "auth-proto.h"
82 #define typemask(x) (1<<((x)-1))
85 extern rsaencpwd_init();
86 extern rsaencpwd_send();
87 extern rsaencpwd_is();
88 extern rsaencpwd_reply();
89 extern rsaencpwd_status();
90 extern rsaencpwd_printsub();
93 int auth_debug_mode = 0;
94 int auth_has_failed = 0;
95 int auth_enable_encrypt = 0;
96 static const char *Name = "Noname";
97 static int Server = 0;
98 static Authenticator *authenticated = 0;
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;
106 * Authentication types supported. Plese note that these are stored
107 * in priority order, i.e. try the first one first.
109 Authenticator authenticators[] = {
111 { AUTHTYPE_UNSAFE, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
120 { AUTHTYPE_SRA, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
129 { AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
136 { AUTHTYPE_SPX, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
145 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
147 kerberos5_send_mutual,
151 kerberos5_printsub },
152 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
154 kerberos5_send_oneway,
158 kerberos5_printsub },
161 { AUTHTYPE_RSA_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
167 rsaencpwd_printsub },
172 static Authenticator NoAuth = { 0 };
174 static int i_support = 0;
175 static int i_wont_support = 0;
178 findauthenticator(int type, int way)
180 Authenticator *ap = authenticators;
182 while (ap->type && (ap->type != type || ap->way != way))
184 return(ap->type ? ap : 0);
188 auth_init(const char *name, int server)
190 Authenticator *ap = authenticators;
199 if (!ap->init || (*ap->init)(ap, server)) {
200 i_support |= typemask(ap->type);
202 printf(">>>%s: I support auth type %d %d\r\n",
206 else if (auth_debug_mode)
207 printf(">>>%s: Init failed: auth type %d %d\r\n",
208 Name, ap->type, ap->way);
214 auth_disable_name(char *name)
217 for (x = 0; x < AUTHTYPE_CNT; ++x) {
218 if (!strcasecmp(name, AUTHTYPE_NAME(x))) {
219 i_wont_support |= typemask(x);
226 getauthmask(char *type, int *maskp)
230 if (!strcasecmp(type, AUTHTYPE_NAME(0))) {
235 for (x = 1; x < AUTHTYPE_CNT; ++x) {
236 if (!strcasecmp(type, AUTHTYPE_NAME(x))) {
237 *maskp = typemask(x);
245 auth_enable(char *type)
247 return(auth_onoff(type, 1));
251 auth_disable(char *type)
253 return(auth_onoff(type, 0));
257 auth_onoff(char *type, int on)
262 if (!strcasecmp(type, "?") || !strcasecmp(type, "help")) {
263 printf("auth %s 'type'\n", on ? "enable" : "disable");
264 printf("Where 'type' is one of:\n");
265 printf("\t%s\n", AUTHTYPE_NAME(0));
267 for (ap = authenticators; ap->type; ap++) {
268 if ((mask & (i = typemask(ap->type))) != 0)
271 printf("\t%s\n", AUTHTYPE_NAME(ap->type));
276 if (!getauthmask(type, &mask)) {
277 printf("%s: invalid authentication type\n", type);
281 i_wont_support &= ~mask;
283 i_wont_support |= mask;
288 auth_togdebug(int on)
291 auth_debug_mode ^= 1;
293 auth_debug_mode = on;
294 printf("auth debugging %s\n", auth_debug_mode ? "enabled" : "disabled");
304 if (i_wont_support == -1)
305 printf("Authentication disabled\n");
307 printf("Authentication enabled\n");
310 for (ap = authenticators; ap->type; ap++) {
311 if ((mask & (i = typemask(ap->type))) != 0)
314 printf("%s: %s\n", AUTHTYPE_NAME(ap->type),
315 (i_wont_support & typemask(ap->type)) ?
316 "disabled" : "enabled");
322 * This routine is called by the server to start authentication
328 static unsigned char str_request[64] = { IAC, SB,
329 TELOPT_AUTHENTICATION,
331 Authenticator *ap = authenticators;
332 unsigned char *e = str_request + 4;
334 if (!authenticating) {
337 if (i_support & ~i_wont_support & typemask(ap->type)) {
338 if (auth_debug_mode) {
339 printf(">>>%s: Sending type %d %d\r\n",
340 Name, ap->type, ap->way);
349 telnet_net_write(str_request, e - str_request);
350 printsub('>', &str_request[2], e - str_request - 2);
355 * This is called when an AUTH SEND is received.
356 * It should never arrive on the server side (as only the server can
357 * send an AUTH SEND).
358 * You should probably respond to it if you can...
360 * If you want to respond to the types out of order (i.e. even
361 * if he sends LOGIN KERBEROS and you support both, you respond
362 * with KERBEROS instead of LOGIN (which is against what the
363 * protocol says)) you will have to hack this code...
366 auth_send(unsigned char *data, int cnt)
369 static unsigned char str_none[] = { IAC, SB, TELOPT_AUTHENTICATION,
370 TELQUAL_IS, AUTHTYPE_NULL, 0,
373 if (auth_debug_mode) {
374 printf(">>>%s: auth_send called!\r\n", Name);
379 if (auth_debug_mode) {
380 printf(">>>%s: auth_send got:", Name);
381 printd(data, cnt); printf("\r\n");
385 * Save the data, if it is new, so that we can continue looking
386 * at it if the authorization we try doesn't work
388 if (data < _auth_send_data ||
389 data > _auth_send_data + sizeof(_auth_send_data)) {
390 auth_send_cnt = cnt > sizeof(_auth_send_data)
391 ? sizeof(_auth_send_data)
393 memmove(_auth_send_data, data, auth_send_cnt);
394 auth_send_data = _auth_send_data;
397 * This is probably a no-op, but we just make sure
399 auth_send_data = data;
402 while ((auth_send_cnt -= 2) >= 0) {
404 printf(">>>%s: He supports %d\r\n",
405 Name, *auth_send_data);
406 if ((i_support & ~i_wont_support) & typemask(*auth_send_data)) {
407 ap = findauthenticator(auth_send_data[0],
409 if (ap && ap->send) {
411 printf(">>>%s: Trying %d %d\r\n",
412 Name, auth_send_data[0],
414 if ((*ap->send)(ap)) {
416 * Okay, we found one we like
418 * we can go home now.
421 printf(">>>%s: Using type %d\r\n",
422 Name, *auth_send_data);
428 * just continue on and look for the
429 * next one if we didn't do anything.
434 telnet_net_write(str_none, sizeof(str_none));
435 printsub('>', &str_none[2], sizeof(str_none) - 2);
437 printf(">>>%s: Sent failure message\r\n", Name);
438 auth_finished(0, AUTH_REJECT);
442 * We requested strong authentication, however no mechanisms worked.
443 * Therefore, exit on client end.
445 printf("Unable to securely authenticate user ... exit\n");
451 auth_send_retry(void)
454 * if auth_send_cnt <= 0 then auth_send will end up rejecting
455 * the authentication and informing the other side of this.
457 auth_send(auth_send_data, auth_send_cnt);
461 auth_is(unsigned char *data, int cnt)
468 if (data[0] == AUTHTYPE_NULL) {
469 auth_finished(0, AUTH_REJECT);
473 if ((ap = findauthenticator(data[0], data[1]))) {
475 (*ap->is)(ap, data+2, cnt-2);
476 } else if (auth_debug_mode)
477 printf(">>>%s: Invalid authentication in IS: %d\r\n",
482 auth_reply(unsigned char *data, int cnt)
489 if ((ap = findauthenticator(data[0], data[1]))) {
491 (*ap->reply)(ap, data+2, cnt-2);
492 } else if (auth_debug_mode)
493 printf(">>>%s: Invalid authentication in SEND: %d\r\n",
498 auth_name(unsigned char *data, int cnt)
504 printf(">>>%s: Empty name in NAME\r\n", Name);
507 if (cnt > sizeof(savename) - 1) {
509 printf(">>>%s: Name in NAME (%d) exceeds %lu length\r\n",
510 Name, cnt, (unsigned long)(sizeof(savename)-1));
513 memmove(savename, data, cnt);
514 savename[cnt] = '\0'; /* Null terminate */
516 printf(">>>%s: Got NAME [%s]\r\n", Name, savename);
517 auth_encrypt_user(savename);
521 auth_sendname(unsigned char *cp, int len)
523 static unsigned char str_request[256+6]
524 = { IAC, SB, TELOPT_AUTHENTICATION, TELQUAL_NAME, };
525 unsigned char *e = str_request + 4;
526 unsigned char *ee = &str_request[sizeof(str_request)-2];
529 if ((*e++ = *cp++) == IAC)
536 telnet_net_write(str_request, e - str_request);
537 printsub('>', &str_request[2], e - &str_request[2]);
542 auth_finished(Authenticator *ap, int result)
544 if (!(authenticated = ap))
545 authenticated = &NoAuth;
553 auth_finished(0, AUTH_REJECT);
557 auth_wait(char *name, size_t name_sz)
560 printf(">>>%s: in auth_wait.\r\n", Name);
562 if (Server && !authenticating)
565 signal(SIGALRM, auth_intr);
567 while (!authenticated)
571 signal(SIGALRM, SIG_DFL);
574 * Now check to see if the user is valid or not
576 if (!authenticated || authenticated == &NoAuth)
579 if (validuser == AUTH_VALID)
580 validuser = AUTH_USER;
582 if (authenticated->status)
583 validuser = (*authenticated->status)(authenticated,
592 auth_debug_mode = mode;
596 auth_printsub(unsigned char *data, size_t cnt,
597 unsigned char *buf, size_t buflen)
601 if ((ap = findauthenticator(data[1], data[2])) && ap->printsub)
602 (*ap->printsub)(data, cnt, buf, buflen);
604 auth_gen_printsub(data, cnt, buf, buflen);
608 auth_gen_printsub(unsigned char *data, size_t cnt,
609 unsigned char *buf, size_t buflen)
612 unsigned char tbuf[16];
616 buf[buflen-1] = '\0';
619 for (; cnt > 0; cnt--, data++) {
620 snprintf((char*)tbuf, sizeof(tbuf), " %d", *data);
621 for (cp = tbuf; *cp && buflen > 0; --buflen)