2 * Copyright (c) 1995, 1996, 1997, 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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
34 * Copyright 1992, 2002 by the Massachusetts Institute of Technology.
35 * All Rights Reserved.
37 * Export of this software from the United States of America may
38 * 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
45 * notice appear in all copies and that both that copyright notice and
46 * this permission notice appear in supporting documentation, and that
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
49 * permission. Furthermore if you modify this software you must label
50 * your software as modified software and not distribute it in such a
51 * fashion that it might be confused with the original M.I.T. software.
52 * 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.
57 #include <afsconfig.h>
59 #include "../afs/param.h"
61 #include <afs/param.h>
68 #include "../afs/sysincludes.h"
69 #include "../afs/afsincludes.h"
70 #include "../afs/stds.h"
71 #include "../rx/xdr.h"
73 #include "../des/des.h"
74 #include "../afs/lifetimes.h"
75 #include "../afs/rxkad.h"
76 #else /* defined(UKERNEL) */
78 #include <sys/types.h>
82 #include <netinet/in.h>
94 #include "lifetimes.h"
96 #endif /* defined(UKERNEL) */
98 #include "v5gen-rewrite.h"
99 #include "asn1-common.h"
108 * Principal conversion Taken from src/lib/krb5/krb/conv_princ from MIT Kerberos. If you
109 * find a need to change the services here, please consider opening a
110 * bug with MIT by sending mail to krb5-bugs@mit.edu.
120 #define DO_REALM_CONVERSION 0x00000001
123 * Kadmin doesn't do realm conversion because it's currently
124 * kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
126 * "Realm conversion" is a bit of a misnomer; really, the v5 name is
127 * using a FQDN or something that looks like it, where the v4 name is
128 * just using the first label. Sometimes that second principal name
129 * component is a hostname, sometimes the realm name, sometimes it's
132 * This list should probably be more configurable, and more than
133 * likely on a per-realm basis, so locally-defined services can be
136 static const struct krb_convert sconv_list[] = {
137 /* Realm conversion, Change service name */
138 #define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
139 /* Realm conversion */
140 #define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
141 /* No Realm conversion */
142 #define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
193 krb5_des_decrypt(struct ktc_encryptionKey *, int, void *, size_t, void *,
200 tkt_DecodeTicket5(char *ticket, afs_int32 ticket_len,
201 int (*get_key) (char *, int, struct ktc_encryptionKey *),
202 char *get_key_rock, int serv_kvno, char *name, char *inst,
203 char *cell, char *session_key, afs_int32 * host,
204 afs_int32 * start, afs_int32 * end)
206 char plain[MAXKRB5TICKETLEN];
207 struct ktc_encryptionKey serv_key;
208 Ticket t5; /* Must free */
209 EncTicketPart decr_part; /* Must free */
211 size_t siz, plainsiz;
213 char *v5_comp0, *v5_comp1, *c;
214 const struct krb_convert *p;
216 memset(&t5, 0, sizeof(t5));
217 memset(&decr_part, 0, sizeof(decr_part));
222 return RXKADBADTICKET; /* no ticket */
224 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5) {
225 code = decode_Ticket(ticket, ticket_len, &t5, &siz);
232 code = decode_EncryptedData(ticket, ticket_len, &t5.enc_part, &siz);
237 /* If kvno is null, it's probably not included because it was kvno==0
239 if (t5.enc_part.kvno == NULL) {
242 v5_serv_kvno = *t5.enc_part.kvno;
245 /* Check that the key type really fit into 8 bytes */
246 switch (t5.enc_part.etype) {
247 case ETYPE_DES_CBC_CRC:
248 case ETYPE_DES_CBC_MD4:
249 case ETYPE_DES_CBC_MD5:
256 if (t5.enc_part.cipher.length > sizeof(plain)
257 || t5.enc_part.cipher.length % 8 != 0)
260 code = (*get_key) (get_key_rock, v5_serv_kvno, &serv_key);
264 /* Decrypt data here, save in plain, assume it will shrink */
266 krb5_des_decrypt(&serv_key, t5.enc_part.etype,
267 t5.enc_part.cipher.data, t5.enc_part.cipher.length,
273 code = decode_EncTicketPart(plain, plainsiz, &decr_part, &siz);
277 /* Extract realm and principal */
278 strncpy(cell, decr_part.crealm, MAXKTCNAMELEN);
279 cell[MAXKTCNAMELEN - 1] = '\0';
281 switch (decr_part.cname.name_string.len) {
283 v5_comp0 = decr_part.cname.name_string.val[0];
284 v5_comp1 = decr_part.cname.name_string.val[1];
287 if (strcmp(p->v5_str, v5_comp0) == 0) {
289 * It is, so set the new name now, and chop off
290 * instance's domain name if requested.
292 strncpy(name, p->v4_str, MAXKTCNAMELEN);
293 name[MAXKTCNAMELEN - 1] = '\0';
294 if (p->flags & DO_REALM_CONVERSION) {
295 c = strchr(v5_comp1, '.');
296 if (!c || (c - v5_comp1) >= MAXKTCNAMELEN - 1)
298 strncpy(inst, v5_comp1, c - v5_comp1);
299 inst[c - v5_comp1] = '\0';
307 strncpy(inst, decr_part.cname.name_string.val[1], MAXKTCNAMELEN);
308 inst[MAXKTCNAMELEN - 1] = '\0';
309 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
310 name[MAXKTCNAMELEN - 1] = '\0';
314 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
315 name[MAXKTCNAMELEN - 1] = '\0';
322 * If the first part of the name_string contains a dot, punt since
323 * then we can't see the diffrence between the kerberos 5
324 * principals foo.root and foo/root later in the fileserver.
326 if (strchr(decr_part.cname.name_string.val[0], '.') != NULL)
329 /* Verify that decr_part.key is of right type */
330 switch (decr_part.key.keytype) {
331 case ETYPE_DES_CBC_CRC:
332 case ETYPE_DES_CBC_MD4:
333 case ETYPE_DES_CBC_MD5:
339 if (decr_part.key.keyvalue.length != 8)
342 /* Extract session key */
343 memcpy(session_key, decr_part.key.keyvalue.data, 8);
345 /* Check lifetimes and host addresses, flags etc */
347 time_t now = time(0); /* Use fast time package instead??? */
348 *start = decr_part.authtime;
349 if (decr_part.starttime)
350 *start = *decr_part.starttime;
352 if (*start - now > CLOCK_SKEW || decr_part.flags.invalid)
355 if (decr_part.flags.invalid)
358 if (now > decr_part.endtime)
360 *end = decr_part.endtime;
364 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5)
367 free_EncryptedData(&t5.enc_part);
368 free_EncTicketPart(&decr_part);
369 memset(&serv_key, 0, sizeof(serv_key));
373 code = RXKADUNKNOWNKEY;
382 code = RXKADBADTICKET;
388 verify_checksum_md4(void *data, size_t len,
389 void *cksum, size_t cksumsz,
390 struct ktc_encryptionKey *key)
393 unsigned char tmp[16];
396 MD4_Update(&md4, data, len);
397 MD4_Final(tmp, &md4);
399 if (memcmp(tmp, cksum, cksumsz) != 0)
405 verify_checksum_md5(void *data, size_t len,
406 void *cksum, size_t cksumsz,
407 struct ktc_encryptionKey *key)
410 unsigned char tmp[16];
413 MD5_Update(&md5, data, len);
414 MD5_Final(tmp, &md5);
416 if (memcmp(tmp, cksum, cksumsz) != 0)
422 verify_checksum_crc(void *data, size_t len, void *cksum, size_t cksumsz,
423 struct ktc_encryptionKey *key)
428 _rxkad_crc_init_table();
429 crc = _rxkad_crc_update(data, len, 0);
431 r[1] = (crc >> 8) & 0xff;
432 r[2] = (crc >> 16) & 0xff;
433 r[3] = (crc >> 24) & 0xff;
435 if (memcmp(cksum, r, 4) != 0)
442 krb5_des_decrypt(struct ktc_encryptionKey *key, int etype, void *in,
443 size_t insz, void *out, size_t * outsz)
445 int (*cksum_func) (void *, size_t, void *, size_t,
446 struct ktc_encryptionKey *);
451 int ret = 1; /* failure */
455 des_key_sched(key, &s);
457 #define CONFOUNDERSZ 8
460 case ETYPE_DES_CBC_CRC:
461 memcpy(&ivec, key, sizeof(ivec));
463 cksum_func = verify_checksum_crc;
465 case ETYPE_DES_CBC_MD4:
466 memset(&ivec, 0, sizeof(ivec));
468 cksum_func = verify_checksum_md4;
470 case ETYPE_DES_CBC_MD5:
471 memset(&ivec, 0, sizeof(ivec));
473 cksum_func = verify_checksum_md5;
479 des_cbc_encrypt(in, out, insz, s, &ivec, 0);
481 memcpy(cksum, (char *)out + CONFOUNDERSZ, cksumsz);
482 memset((char *)out + CONFOUNDERSZ, 0, cksumsz);
485 ret = (*cksum_func) (out, insz, cksum, cksumsz, key);
487 *outsz = insz - CONFOUNDERSZ - cksumsz;
488 memmove(out, (char *)out + CONFOUNDERSZ + cksumsz, *outsz);