2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
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15 * This product includes software developed by the University of
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33 * $FreeBSD: src/crypto/telnet/libtelnet/auth.c,v 1.3.2.5 2002/04/13 10:59:07 markm Exp $
34 * $DragonFly: src/crypto/telnet/libtelnet/auth.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
36 * @(#)auth.c 8.3 (Berkeley) 5/30/95
37 * $FreeBSD: src/crypto/telnet/libtelnet/auth.c,v 1.3.2.5 2002/04/13 10:59:07 markm Exp $
41 * Copyright (C) 1990 by the Massachusetts Institute of Technology
43 * Export of this software from the United States of America is assumed
44 * to require a specific license from the United States Government.
45 * It is the responsibility of any person or organization contemplating
46 * export to obtain such a license before exporting.
48 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
49 * distribute this software and its documentation for any purpose and
50 * without fee is hereby granted, provided that the above copyright
51 * notice appear in all copies and that both that copyright notice and
52 * this permission notice appear in supporting documentation, and that
53 * the name of M.I.T. not be used in advertising or publicity pertaining
54 * to distribution of the software without specific, written prior
55 * permission. M.I.T. makes no representations about the suitability of
56 * this software for any purpose. It is provided "as is" without express
57 * or implied warranty.
63 #include <sys/types.h>
69 #include <arpa/telnet.h>
73 #include "misc-proto.h"
74 #include "auth-proto.h"
76 #define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0)
79 extern krb4encpwd_init();
80 extern krb4encpwd_send();
81 extern krb4encpwd_is();
82 extern krb4encpwd_reply();
83 extern krb4encpwd_status();
84 extern krb4encpwd_printsub();
88 extern rsaencpwd_init();
89 extern rsaencpwd_send();
90 extern rsaencpwd_is();
91 extern rsaencpwd_reply();
92 extern rsaencpwd_status();
93 extern rsaencpwd_printsub();
96 int auth_debug_mode = 0;
97 static const char *Name = "Noname";
98 static int Server = 0;
99 static Authenticator *authenticated = 0;
100 static int authenticating = 0;
101 static int validuser = 0;
102 static unsigned char _auth_send_data[256];
103 static unsigned char *auth_send_data;
104 static int auth_send_cnt = 0;
106 int auth_onoff(char *type, int on);
107 void auth_encrypt_user(char *name);
110 * Authentication types supported. Plese note that these are stored
111 * in priority order, i.e. try the first one first.
113 Authenticator authenticators[] = {
116 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
118 kerberos5_send_mutual,
122 kerberos5_printsub },
123 # endif /* ENCRYPTION */
124 { AUTHTYPE_KERBEROS_V5, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
126 kerberos5_send_oneway,
130 kerberos5_printsub },
134 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
140 kerberos4_printsub },
141 # endif /* ENCRYPTION */
142 { AUTHTYPE_KERBEROS_V4, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
148 kerberos4_printsub },
151 { AUTHTYPE_KRB4_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_MUTUAL,
157 krb4encpwd_printsub },
160 { AUTHTYPE_RSA_ENCPWD, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
166 rsaencpwd_printsub },
169 { AUTHTYPE_SRA, AUTH_WHO_CLIENT|AUTH_HOW_ONE_WAY,
178 { 0, 0, 0, 0, 0, 0, 0, 0 },
181 static Authenticator NoAuth = { 0, 0, 0, 0, 0, 0, 0, 0 };
183 static int i_support = 0;
184 static int i_wont_support = 0;
187 findauthenticator(int type, int way)
189 Authenticator *ap = authenticators;
191 while (ap->type && (ap->type != type || ap->way != way))
193 return(ap->type ? ap : 0);
197 auth_init(const char *name, int server)
199 Authenticator *ap = authenticators;
208 if (!ap->init || (*ap->init)(ap, server)) {
209 i_support |= typemask(ap->type);
211 printf(">>>%s: I support auth type %d %d\r\n",
215 else if (auth_debug_mode)
216 printf(">>>%s: Init failed: auth type %d %d\r\n",
217 Name, ap->type, ap->way);
223 auth_disable_name(char *name)
226 for (x = 0; x < AUTHTYPE_CNT; ++x) {
227 if (AUTHTYPE_NAME(x) && !strcasecmp(name, AUTHTYPE_NAME(x))) {
228 i_wont_support |= typemask(x);
235 getauthmask(char *type, int *maskp)
239 if (AUTHTYPE_NAME(0) && !strcasecmp(type, AUTHTYPE_NAME(0))) {
244 for (x = 1; x < AUTHTYPE_CNT; ++x) {
245 if (AUTHTYPE_NAME(x) && !strcasecmp(type, AUTHTYPE_NAME(x))) {
246 *maskp = typemask(x);
254 auth_enable(char *type)
256 return(auth_onoff(type, 1));
260 auth_disable(char *type)
262 return(auth_onoff(type, 0));
266 auth_onoff(char *type, int on)
271 if (!strcasecmp(type, "?") || !strcasecmp(type, "help")) {
272 printf("auth %s 'type'\n", on ? "enable" : "disable");
273 printf("Where 'type' is one of:\n");
274 printf("\t%s\n", AUTHTYPE_NAME(0));
276 for (ap = authenticators; ap->type; ap++) {
277 if ((mask & (i = typemask(ap->type))) != 0)
280 printf("\t%s\n", AUTHTYPE_NAME(ap->type));
285 if (!getauthmask(type, &mask)) {
286 printf("%s: invalid authentication type\n", type);
290 i_wont_support &= ~mask;
292 i_wont_support |= mask;
297 auth_togdebug(int on)
300 auth_debug_mode ^= 1;
302 auth_debug_mode = on;
303 printf("auth debugging %s\n", auth_debug_mode ? "enabled" : "disabled");
313 if (i_wont_support == -1)
314 printf("Authentication disabled\n");
316 printf("Authentication enabled\n");
319 for (ap = authenticators; ap->type; ap++) {
320 if ((mask & (i = typemask(ap->type))) != 0)
323 printf("%s: %s\n", AUTHTYPE_NAME(ap->type),
324 (i_wont_support & typemask(ap->type)) ?
325 "disabled" : "enabled");
331 * This routine is called by the server to start authentication
337 static unsigned char str_request[64] = { IAC, SB,
338 TELOPT_AUTHENTICATION,
340 Authenticator *ap = authenticators;
341 unsigned char *e = str_request + 4;
343 if (!authenticating) {
346 if (i_support & ~i_wont_support & typemask(ap->type)) {
347 if (auth_debug_mode) {
348 printf(">>>%s: Sending type %d %d\r\n",
349 Name, ap->type, ap->way);
358 net_write(str_request, e - str_request);
359 printsub('>', &str_request[2], e - str_request - 2);
364 * This is called when an AUTH SEND is received.
365 * It should never arrive on the server side (as only the server can
366 * send an AUTH SEND).
367 * You should probably respond to it if you can...
369 * If you want to respond to the types out of order (i.e. even
370 * if he sends LOGIN KERBEROS and you support both, you respond
371 * with KERBEROS instead of LOGIN (which is against what the
372 * protocol says)) you will have to hack this code...
375 auth_send(unsigned char *data, int cnt)
378 static unsigned char str_none[] = { IAC, SB, TELOPT_AUTHENTICATION,
379 TELQUAL_IS, AUTHTYPE_NULL, 0,
382 if (auth_debug_mode) {
383 printf(">>>%s: auth_send called!\r\n", Name);
388 if (auth_debug_mode) {
389 printf(">>>%s: auth_send got:", Name);
390 printd(data, cnt); printf("\r\n");
394 * Save the data, if it is new, so that we can continue looking
395 * at it if the authorization we try doesn't work
397 if (data < _auth_send_data ||
398 data > _auth_send_data + sizeof(_auth_send_data)) {
399 auth_send_cnt = (size_t)cnt > sizeof(_auth_send_data)
400 ? sizeof(_auth_send_data)
402 memmove((void *)_auth_send_data, (void *)data, auth_send_cnt);
403 auth_send_data = _auth_send_data;
406 * This is probably a no-op, but we just make sure
408 auth_send_data = data;
411 while ((auth_send_cnt -= 2) >= 0) {
413 printf(">>>%s: He supports %d\r\n",
414 Name, *auth_send_data);
415 if ((i_support & ~i_wont_support) & typemask(*auth_send_data)) {
416 ap = findauthenticator(auth_send_data[0],
418 if (ap && ap->send) {
420 printf(">>>%s: Trying %d %d\r\n",
421 Name, auth_send_data[0],
423 if ((*ap->send)(ap)) {
425 * Okay, we found one we like
427 * we can go home now.
430 printf(">>>%s: Using type %d\r\n",
431 Name, *auth_send_data);
437 * just continue on and look for the
438 * next one if we didn't do anything.
443 net_write(str_none, sizeof(str_none));
444 printsub('>', &str_none[2], sizeof(str_none) - 2);
446 printf(">>>%s: Sent failure message\r\n", Name);
447 auth_finished(0, AUTH_REJECT);
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)
500 unsigned char savename[256];
504 printf(">>>%s: Empty name in NAME\r\n", Name);
507 if ((size_t)cnt > sizeof(savename) - 1) {
509 printf(">>>%s: Name in NAME (%d) exceeds %d length\r\n",
510 Name, cnt, (u_int)sizeof(savename)-1);
513 memmove((void *)savename, (void *)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 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;
551 auth_intr(int sig __unused)
553 auth_finished(0, AUTH_REJECT);
557 auth_wait(char *name)
560 printf(">>>%s: in auth_wait.\r\n", Name);
562 if (Server && !authenticating)
565 (void) signal(SIGALRM, auth_intr);
567 while (!authenticated)
571 (void) 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,
589 auth_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
593 if ((ap = findauthenticator(data[1], data[2])) && ap->printsub)
594 (*ap->printsub)(data, cnt, buf, buflen);
596 auth_gen_printsub(data, cnt, buf, buflen);
600 auth_gen_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
603 unsigned char tbuf[16];
607 buf[buflen-1] = '\0';
610 for (; cnt > 0; cnt--, data++) {
611 sprintf((char *)tbuf, " %d", *data);
612 for (cp = tbuf; *cp && buflen > 0; --buflen)