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.
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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
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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/kerberos5.c,v 1.1.1.1.8.2 2003/04/24 19:13:59 nectar Exp $
34 * $DragonFly: src/crypto/telnet/libtelnet/kerberos5.c,v 1.2 2003/06/17 04:24:37 dillon Exp $
38 * Copyright (C) 1990 by the Massachusetts Institute of Technology
40 * Export of this software from the United States of America may
41 * require a specific license from the United States Government.
42 * It is the responsibility of any person or organization contemplating
43 * export to obtain such a license before exporting.
45 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
46 * distribute this software and its documentation for any purpose and
47 * without fee is hereby granted, provided that the above copyright
48 * notice appear in all copies and that both that copyright notice and
49 * this permission notice appear in supporting documentation, and that
50 * the name of M.I.T. not be used in advertising or publicity pertaining
51 * to distribution of the software without specific, written prior
52 * permission. M.I.T. makes no representations about the suitability of
53 * this software for any purpose. It is provided "as is" without express
54 * or implied warranty.
59 #include <arpa/telnet.h>
67 #define Authenticator k5_Authenticator
75 int forward_flags = 0; /* Flags get set in telnet/main.c on -f and -F */
77 /* These values need to be the same as those defined in telnet/main.c. */
78 /* Either define them in both places, or put in some common header file. */
79 #define OPTS_FORWARD_CREDS 0x00000002
80 #define OPTS_FORWARDABLE_CREDS 0x00000001
82 void kerberos5_forward (Authenticator *);
84 static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
85 AUTHTYPE_KERBEROS_V5, };
87 #define KRB_AUTH 0 /* Authentication data follows */
88 #define KRB_REJECT 1 /* Rejected (reason might follow) */
89 #define KRB_ACCEPT 2 /* Accepted */
90 #define KRB_RESPONSE 3 /* Response for mutual auth. */
92 #define KRB_FORWARD 4 /* Forwarded credentials follow */
93 #define KRB_FORWARD_ACCEPT 5 /* Forwarded credentials accepted */
94 #define KRB_FORWARD_REJECT 6 /* Forwarded credentials rejected */
96 static krb5_data auth;
97 static krb5_ticket *ticket;
99 static krb5_context context;
100 static krb5_auth_context auth_context;
103 Data(Authenticator *ap, int type, const char *d, int c)
105 unsigned char *p = str_data + 4;
106 const unsigned char *cd = d;
111 if (auth_debug_mode) {
112 printf("%s:%d: [%d] (%d)",
113 str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
123 if ((*p++ = *cd++) == IAC)
128 if (str_data[3] == TELQUAL_IS)
129 printsub('>', &str_data[2], p - &str_data[2]);
130 return(net_write(str_data, p - str_data));
134 kerberos5_init(Authenticator *ap __unused, int server)
138 ret = krb5_init_context(&context);
143 krb5_kt_cursor cursor;
145 ret = krb5_kt_default(context, &kt);
149 ret = krb5_kt_start_seq_get (context, kt, &cursor);
151 krb5_kt_close (context, kt);
154 krb5_kt_end_seq_get (context, kt, &cursor);
155 krb5_kt_close (context, kt);
157 str_data[3] = TELQUAL_REPLY;
159 str_data[3] = TELQUAL_IS;
166 kerberos5_send(const char *name, Authenticator *ap)
171 krb5_data cksum_data;
174 if (!UserNameRequested) {
175 if (auth_debug_mode) {
176 printf("Kerberos V5: no user name supplied\r\n");
181 ret = krb5_cc_default(context, &ccache);
183 if (auth_debug_mode) {
184 printf("Kerberos V5: could not get default ccache: %s\r\n",
185 krb5_get_err_text (context, ret));
190 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
191 ap_opts = AP_OPTS_MUTUAL_REQUIRED;
194 ap_opts |= AP_OPTS_USE_SUBKEY;
196 ret = krb5_auth_con_init (context, &auth_context);
198 if (auth_debug_mode) {
199 printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
200 krb5_get_err_text(context, ret));
205 ret = krb5_auth_con_setaddrs_from_fd (context,
209 if (auth_debug_mode) {
210 printf ("Kerberos V5:"
211 " krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
212 krb5_get_err_text(context, ret));
217 krb5_auth_con_setkeytype (context, auth_context, KEYTYPE_DES);
222 cksum_data.length = sizeof(foo);
223 cksum_data.data = foo;
227 krb5_principal service;
231 ret = krb5_sname_to_principal (context,
237 if (auth_debug_mode) {
238 printf ("Kerberos V5:"
239 " krb5_sname_to_principal(%s) failed (%s)\r\n",
240 RemoteHostName, krb5_get_err_text(context, ret));
244 ret = krb5_unparse_name_fixed(context, service, sname, sizeof(sname));
246 if (auth_debug_mode) {
247 printf ("Kerberos V5:"
248 " krb5_unparse_name_fixed failed (%s)\r\n",
249 krb5_get_err_text(context, ret));
253 printf("[ Trying %s (%s)... ]\r\n", name, sname);
254 ret = krb5_mk_req_exact(context, &auth_context, ap_opts,
256 &cksum_data, ccache, &auth);
257 krb5_free_principal (context, service);
261 if (1 || auth_debug_mode) {
262 printf("Kerberos V5: mk_req failed (%s)\r\n",
263 krb5_get_err_text(context, ret));
268 if (!auth_sendname((unsigned char *)UserNameRequested,
269 strlen(UserNameRequested))) {
271 printf("Not enough room for user name\r\n");
274 if (!Data(ap, KRB_AUTH, auth.data, auth.length)) {
276 printf("Not enough room for authentication data\r\n");
279 if (auth_debug_mode) {
280 printf("Sent Kerberos V5 credentials to server\r\n");
286 kerberos5_send_mutual(Authenticator *ap)
288 return kerberos5_send("mutual KERBEROS5", ap);
292 kerberos5_send_oneway(Authenticator *ap)
294 return kerberos5_send("KERBEROS5", ap);
298 kerberos5_is(Authenticator *ap, unsigned char *data, int cnt)
302 krb5_keyblock *key_block;
304 krb5_principal server;
311 auth.data = (char *)data;
316 ret = krb5_auth_con_init (context, &auth_context);
318 Data(ap, KRB_REJECT, "krb5_auth_con_init failed", -1);
319 auth_finished(ap, AUTH_REJECT);
321 printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
322 krb5_get_err_text(context, ret));
326 ret = krb5_auth_con_setaddrs_from_fd (context,
330 Data(ap, KRB_REJECT, "krb5_auth_con_setaddrs_from_fd failed", -1);
331 auth_finished(ap, AUTH_REJECT);
333 printf("Kerberos V5: "
334 "krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
335 krb5_get_err_text(context, ret));
339 ret = krb5_sock_to_principal (context,
345 Data(ap, KRB_REJECT, "krb5_sock_to_principal failed", -1);
346 auth_finished(ap, AUTH_REJECT);
348 printf("Kerberos V5: "
349 "krb5_sock_to_principal failed (%s)\r\n",
350 krb5_get_err_text(context, ret));
354 ret = krb5_rd_req(context,
362 krb5_free_principal (context, server);
367 "Read req failed: %s",
368 krb5_get_err_text(context, ret));
369 Data(ap, KRB_REJECT, errbuf, -1);
371 printf("%s\r\n", errbuf);
382 ret = krb5_verify_authenticator_checksum(context,
389 asprintf(&errbuf, "Bad checksum: %s",
390 krb5_get_err_text(context, ret));
391 Data(ap, KRB_REJECT, errbuf, -1);
393 printf ("%s\r\n", errbuf);
398 ret = krb5_auth_con_getremotesubkey (context,
403 Data(ap, KRB_REJECT, "krb5_auth_con_getremotesubkey failed", -1);
404 auth_finished(ap, AUTH_REJECT);
406 printf("Kerberos V5: "
407 "krb5_auth_con_getremotesubkey failed (%s)\r\n",
408 krb5_get_err_text(context, ret));
412 if (key_block == NULL) {
413 ret = krb5_auth_con_getkey(context,
418 Data(ap, KRB_REJECT, "krb5_auth_con_getkey failed", -1);
419 auth_finished(ap, AUTH_REJECT);
421 printf("Kerberos V5: "
422 "krb5_auth_con_getkey failed (%s)\r\n",
423 krb5_get_err_text(context, ret));
426 if (key_block == NULL) {
427 Data(ap, KRB_REJECT, "no subkey received", -1);
428 auth_finished(ap, AUTH_REJECT);
430 printf("Kerberos V5: "
431 "krb5_auth_con_getremotesubkey returned NULL key\r\n");
435 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
436 ret = krb5_mk_rep(context, auth_context, &outbuf);
439 "krb5_mk_rep failed", -1);
440 auth_finished(ap, AUTH_REJECT);
442 printf("Kerberos V5: "
443 "krb5_mk_rep failed (%s)\r\n",
444 krb5_get_err_text(context, ret));
447 Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length);
449 if (krb5_unparse_name(context, ticket->client, &name))
452 if(UserNameRequested && krb5_kuserok(context,
454 UserNameRequested)) {
455 Data(ap, KRB_ACCEPT, name, name ? -1 : 0);
456 if (auth_debug_mode) {
457 printf("Kerberos5 identifies him as ``%s''\r\n",
461 if(key_block->keytype == ETYPE_DES_CBC_MD5 ||
462 key_block->keytype == ETYPE_DES_CBC_MD4 ||
463 key_block->keytype == ETYPE_DES_CBC_CRC) {
468 skey.data = key_block->keyvalue.data;
469 encrypt_session_key(&skey, 0);
475 asprintf (&msg, "user `%s' is not authorized to "
477 name ? name : "<unknown>",
478 UserNameRequested ? UserNameRequested : "<nobody>");
480 Data(ap, KRB_REJECT, NULL, 0);
482 Data(ap, KRB_REJECT, (void *)msg, -1);
485 auth_finished (ap, AUTH_REJECT);
486 krb5_free_keyblock_contents(context, key_block);
489 auth_finished(ap, AUTH_USER);
490 krb5_free_keyblock_contents(context, key_block);
495 char ccname[1024]; /* XXX */
498 inbuf.data = (char *)data;
501 pwd = getpwnam (UserNameRequested);
505 snprintf (ccname, sizeof(ccname),
506 "FILE:/tmp/krb5cc_%u", pwd->pw_uid);
508 ret = krb5_cc_resolve (context, ccname, &ccache);
511 printf ("Kerberos V5: could not get ccache: %s\r\n",
512 krb5_get_err_text(context, ret));
516 ret = krb5_cc_initialize (context,
521 printf ("Kerberos V5: could not init ccache: %s\r\n",
522 krb5_get_err_text(context, ret));
527 esetenv("KRB5CCNAME", ccname, 1);
529 ret = krb5_rd_cred2 (context,
537 "Read forwarded creds failed: %s",
538 krb5_get_err_text (context, ret));
540 Data(ap, KRB_FORWARD_REJECT, NULL, 0);
542 Data(ap, KRB_FORWARD_REJECT, errbuf, -1);
544 printf("Could not read forwarded credentials: %s\r\n",
548 Data(ap, KRB_FORWARD_ACCEPT, 0, 0);
553 chown (ccname + 5, pwd->pw_uid, -1);
555 printf("Forwarded credentials obtained\r\n");
560 printf("Unknown Kerberos option %d\r\n", data[-1]);
561 Data(ap, KRB_REJECT, 0, 0);
567 kerberos5_reply(Authenticator *ap, unsigned char *data, int cnt)
569 static int mutual_complete = 0;
576 printf("[ Kerberos V5 refuses authentication because %.*s ]\r\n",
579 printf("[ Kerberos V5 refuses authentication ]\r\n");
585 krb5_keyblock *keyblock;
587 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL &&
589 printf("[ Kerberos V5 accepted you, but didn't provide mutual authentication! ]\r\n");
594 printf("[ Kerberos V5 accepts you as ``%.*s'' ]\r\n", cnt, data);
596 printf("[ Kerberos V5 accepts you ]\r\n");
598 ret = krb5_auth_con_getlocalsubkey (context,
602 ret = krb5_auth_con_getkey (context,
606 printf("[ krb5_auth_con_getkey: %s ]\r\n",
607 krb5_get_err_text(context, ret));
614 skey.data = keyblock->keyvalue.data;
615 encrypt_session_key(&skey, 0);
616 krb5_free_keyblock_contents (context, keyblock);
617 auth_finished(ap, AUTH_USER);
618 if (forward_flags & OPTS_FORWARD_CREDS)
619 kerberos5_forward(ap);
623 if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
624 /* the rest of the reply should contain a krb_ap_rep */
625 krb5_ap_rep_enc_part *reply;
630 inbuf.data = (char *)data;
632 ret = krb5_rd_rep(context, auth_context, &inbuf, &reply);
634 printf("[ Mutual authentication failed: %s ]\r\n",
635 krb5_get_err_text (context, ret));
639 krb5_free_ap_rep_enc_part(context, reply);
643 case KRB_FORWARD_ACCEPT:
644 printf("[ Kerberos V5 accepted forwarded credentials ]\r\n");
646 case KRB_FORWARD_REJECT:
647 printf("[ Kerberos V5 refuses forwarded credentials because %.*s ]\r\n",
652 printf("Unknown Kerberos option %d\r\n", data[-1]);
658 kerberos5_status(Authenticator *ap __unused, char *name, int level)
660 if (level < AUTH_USER)
663 if (UserNameRequested &&
664 krb5_kuserok(context,
668 strcpy(name, UserNameRequested);
674 #define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
675 #define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
678 kerberos5_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
682 buf[buflen-1] = '\0'; /* make sure its NULL terminated */
686 case KRB_REJECT: /* Rejected (reason might follow) */
687 strlcpy((char *)buf, " REJECT ", buflen);
690 case KRB_ACCEPT: /* Accepted (name might follow) */
691 strlcpy((char *)buf, " ACCEPT ", buflen);
696 ADDC(buf, buflen, '"');
697 for (i = 4; i < cnt; i++)
698 ADDC(buf, buflen, data[i]);
699 ADDC(buf, buflen, '"');
700 ADDC(buf, buflen, '\0');
704 case KRB_AUTH: /* Authentication data follows */
705 strlcpy((char *)buf, " AUTH", buflen);
709 strlcpy((char *)buf, " RESPONSE", buflen);
712 case KRB_FORWARD: /* Forwarded credentials follow */
713 strlcpy((char *)buf, " FORWARD", buflen);
716 case KRB_FORWARD_ACCEPT: /* Forwarded credentials accepted */
717 strlcpy((char *)buf, " FORWARD_ACCEPT", buflen);
720 case KRB_FORWARD_REJECT: /* Forwarded credentials rejected */
721 /* (reason might follow) */
722 strlcpy((char *)buf, " FORWARD_REJECT", buflen);
726 snprintf(buf, buflen, " %d (unknown)", data[3]);
729 for (i = 4; i < cnt; i++) {
730 snprintf(buf, buflen, " %d", data[i]);
738 kerberos5_forward(Authenticator *ap)
743 krb5_kdc_flags flags;
745 krb5_principal principal;
747 ret = krb5_cc_default (context, &ccache);
750 printf ("KerberosV5: could not get default ccache: %s\r\n",
751 krb5_get_err_text (context, ret));
755 ret = krb5_cc_get_principal (context, ccache, &principal);
758 printf ("KerberosV5: could not get principal: %s\r\n",
759 krb5_get_err_text (context, ret));
763 memset (&creds, 0, sizeof(creds));
765 creds.client = principal;
767 ret = krb5_build_principal (context,
769 strlen(principal->realm),
777 printf ("KerberosV5: could not get principal: %s\r\n",
778 krb5_get_err_text (context, ret));
782 creds.times.endtime = 0;
785 flags.b.forwarded = 1;
786 if (forward_flags & OPTS_FORWARDABLE_CREDS)
787 flags.b.forwardable = 1;
789 ret = krb5_get_forwarded_creds (context,
798 printf ("Kerberos V5: error getting forwarded creds: %s\r\n",
799 krb5_get_err_text (context, ret));
803 if(!Data(ap, KRB_FORWARD, out_data.data, out_data.length)) {
805 printf("Not enough room for authentication data\r\n");
808 printf("Forwarded local Kerberos V5 credentials to server\r\n");
813 /* if this was a K5 authentication try and join a PAG for the user. */
815 kerberos5_dfspag(void)
818 dfspag = krb5_dfs_pag(context, dfsfwd, ticket->client,