2 * Copyright (c) 1995, 1996, 1997, 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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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>
88 #include "lifetimes.h"
90 #endif /* defined(UKERNEL) */
92 #include "v5gen-rewrite.h"
93 #include "asn1-common.h"
102 * Principal conversion Taken from src/lib/krb5/krb/conv_princ from MIT Kerberos. If you
103 * find a need to change the services here, please consider opening a
104 * bug with MIT by sending mail to krb5-bugs@mit.edu.
114 #define DO_REALM_CONVERSION 0x00000001
117 * Kadmin doesn't do realm conversion because it's currently
118 * kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
120 * "Realm conversion" is a bit of a misnomer; really, the v5 name is
121 * using a FQDN or something that looks like it, where the v4 name is
122 * just using the first label. Sometimes that second principal name
123 * component is a hostname, sometimes the realm name, sometimes it's
126 * This list should probably be more configurable, and more than
127 * likely on a per-realm basis, so locally-defined services can be
130 static const struct krb_convert sconv_list[] = {
131 /* Realm conversion, Change service name */
132 #define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
133 /* Realm conversion */
134 #define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
135 /* No Realm conversion */
136 #define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
187 krb5_des_decrypt(struct ktc_encryptionKey *, int, void *, size_t, void *,
194 tkt_DecodeTicket5(char *ticket, afs_int32 ticket_len,
195 int (*get_key) (char *, int, struct ktc_encryptionKey *),
196 char *get_key_rock, int serv_kvno, char *name, char *inst,
197 char *cell, char *session_key, afs_int32 * host,
198 afs_int32 * start, afs_int32 * end)
200 char plain[MAXKRB5TICKETLEN];
201 struct ktc_encryptionKey serv_key;
202 Ticket t5; /* Must free */
203 EncTicketPart decr_part; /* Must free */
205 size_t siz, plainsiz;
207 char *v5_comp0, *v5_comp1, *c;
208 const struct krb_convert *p;
210 memset(&t5, 0, sizeof(t5));
211 memset(&decr_part, 0, sizeof(decr_part));
216 return RXKADBADTICKET; /* no ticket */
218 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5) {
219 code = decode_Ticket(ticket, ticket_len, &t5, &siz);
226 code = decode_EncryptedData(ticket, ticket_len, &t5.enc_part, &siz);
231 /* If kvno is null, it's probably not included because it was kvno==0
233 if (t5.enc_part.kvno == NULL) {
236 v5_serv_kvno = *t5.enc_part.kvno;
239 /* Check that the key type really fit into 8 bytes */
240 switch (t5.enc_part.etype) {
241 case ETYPE_DES_CBC_CRC:
242 case ETYPE_DES_CBC_MD4:
243 case ETYPE_DES_CBC_MD5:
250 if (t5.enc_part.cipher.length > sizeof(plain)
251 || t5.enc_part.cipher.length % 8 != 0)
254 code = (*get_key) (get_key_rock, v5_serv_kvno, &serv_key);
258 /* Decrypt data here, save in plain, assume it will shrink */
260 krb5_des_decrypt(&serv_key, t5.enc_part.etype,
261 t5.enc_part.cipher.data, t5.enc_part.cipher.length,
267 code = decode_EncTicketPart(plain, plainsiz, &decr_part, &siz);
271 /* Extract realm and principal */
272 strncpy(cell, decr_part.crealm, MAXKTCNAMELEN);
273 cell[MAXKTCNAMELEN - 1] = '\0';
275 switch (decr_part.cname.name_string.len) {
277 v5_comp0 = decr_part.cname.name_string.val[0];
278 v5_comp1 = decr_part.cname.name_string.val[1];
281 if (strcmp(p->v5_str, v5_comp0) == 0) {
283 * It is, so set the new name now, and chop off
284 * instance's domain name if requested.
286 strncpy(name, p->v4_str, MAXKTCNAMELEN);
287 name[MAXKTCNAMELEN - 1] = '\0';
288 if (p->flags & DO_REALM_CONVERSION) {
289 c = strchr(v5_comp1, '.');
290 if (!c || (c - v5_comp1) >= MAXKTCNAMELEN - 1)
292 strncpy(inst, v5_comp1, c - v5_comp1);
293 inst[c - v5_comp1] = '\0';
301 strncpy(inst, decr_part.cname.name_string.val[1], MAXKTCNAMELEN);
302 inst[MAXKTCNAMELEN - 1] = '\0';
303 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
304 name[MAXKTCNAMELEN - 1] = '\0';
308 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
309 name[MAXKTCNAMELEN - 1] = '\0';
316 * If the first part of the name_string contains a dot, punt since
317 * then we can't see the diffrence between the kerberos 5
318 * principals foo.root and foo/root later in the fileserver.
320 if (strchr(decr_part.cname.name_string.val[0], '.') != NULL)
323 /* Verify that decr_part.key is of right type */
324 switch (decr_part.key.keytype) {
325 case ETYPE_DES_CBC_CRC:
326 case ETYPE_DES_CBC_MD4:
327 case ETYPE_DES_CBC_MD5:
333 if (decr_part.key.keyvalue.length != 8)
336 /* Extract session key */
337 memcpy(session_key, decr_part.key.keyvalue.data, 8);
339 /* Check lifetimes and host addresses, flags etc */
341 time_t now = time(0); /* Use fast time package instead??? */
342 *start = decr_part.authtime;
343 if (decr_part.starttime)
344 *start = *decr_part.starttime;
346 if (*start - now > CLOCK_SKEW || decr_part.flags.invalid)
349 if (decr_part.flags.invalid)
352 if (now > decr_part.endtime)
354 *end = decr_part.endtime;
358 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5)
361 free_EncryptedData(&t5.enc_part);
362 free_EncTicketPart(&decr_part);
363 memset(&serv_key, 0, sizeof(serv_key));
367 code = RXKADUNKNOWNKEY;
376 code = RXKADBADTICKET;
382 verify_checksum_md4(void *data, size_t len,
383 void *cksum, size_t cksumsz,
384 struct ktc_encryptionKey *key)
387 unsigned char tmp[16];
390 MD4_Update(&md4, data, len);
391 MD4_Final(tmp, &md4);
393 if (memcmp(tmp, cksum, cksumsz) != 0)
399 verify_checksum_md5(void *data, size_t len,
400 void *cksum, size_t cksumsz,
401 struct ktc_encryptionKey *key)
404 unsigned char tmp[16];
407 MD5_Update(&md5, data, len);
408 MD5_Final(tmp, &md5);
410 if (memcmp(tmp, cksum, cksumsz) != 0)
416 verify_checksum_crc(void *data, size_t len, void *cksum, size_t cksumsz,
417 struct ktc_encryptionKey *key)
422 _rxkad_crc_init_table();
423 crc = _rxkad_crc_update(data, len, 0);
425 r[1] = (crc >> 8) & 0xff;
426 r[2] = (crc >> 16) & 0xff;
427 r[3] = (crc >> 24) & 0xff;
429 if (memcmp(cksum, r, 4) != 0)
436 krb5_des_decrypt(struct ktc_encryptionKey *key, int etype, void *in,
437 size_t insz, void *out, size_t * outsz)
439 int (*cksum_func) (void *, size_t, void *, size_t,
440 struct ktc_encryptionKey *);
445 int ret = 1; /* failure */
449 des_key_sched(key, &s);
451 #define CONFOUNDERSZ 8
454 case ETYPE_DES_CBC_CRC:
455 memcpy(&ivec, key, sizeof(ivec));
457 cksum_func = verify_checksum_crc;
459 case ETYPE_DES_CBC_MD4:
460 memset(&ivec, 0, sizeof(ivec));
462 cksum_func = verify_checksum_md4;
464 case ETYPE_DES_CBC_MD5:
465 memset(&ivec, 0, sizeof(ivec));
467 cksum_func = verify_checksum_md5;
473 des_cbc_encrypt(in, out, insz, s, &ivec, 0);
475 memcpy(cksum, (char *)out + CONFOUNDERSZ, cksumsz);
476 memset((char *)out + CONFOUNDERSZ, 0, cksumsz);
479 ret = (*cksum_func) (out, insz, cksum, cksumsz, key);
481 *outsz = insz - CONFOUNDERSZ - cksumsz;
482 memmove(out, (char *)out + CONFOUNDERSZ + cksumsz, *outsz);