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>
94 #include "lifetimes.h"
96 #endif /* defined(UKERNEL) */
98 #include "v5gen-rewrite.h"
99 #include "asn1-common.h"
106 * Principal conversion Taken from src/lib/krb5/krb/conv_princ from MIT Kerberos. If you
107 * find a need to change the services here, please consider opening a
108 * bug with MIT by sending mail to krb5-bugs@mit.edu.
118 #define DO_REALM_CONVERSION 0x00000001
121 * Kadmin doesn't do realm conversion because it's currently
122 * kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
124 * "Realm conversion" is a bit of a misnomer; really, the v5 name is
125 * using a FQDN or something that looks like it, where the v4 name is
126 * just using the first label. Sometimes that second principal name
127 * component is a hostname, sometimes the realm name, sometimes it's
130 * This list should probably be more configurable, and more than
131 * likely on a per-realm basis, so locally-defined services can be
134 static const struct krb_convert sconv_list[] = {
135 /* Realm conversion, Change service name */
136 #define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
137 /* Realm conversion */
138 #define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
139 /* No Realm conversion */
140 #define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
191 krb5_des_decrypt(struct ktc_encryptionKey *, int, void *, size_t, void *,
198 tkt_DecodeTicket5(char *ticket, afs_int32 ticket_len,
199 int (*get_key) (char *, int, struct ktc_encryptionKey *),
200 char *get_key_rock, int serv_kvno, char *name, char *inst,
201 char *cell, char *session_key, afs_int32 * host,
202 afs_int32 * start, afs_int32 * end)
204 char plain[MAXKRB5TICKETLEN];
205 struct ktc_encryptionKey serv_key;
206 Ticket t5; /* Must free */
207 EncTicketPart decr_part; /* Must free */
209 size_t siz, plainsiz;
211 char *v5_comp0, *v5_comp1, *c;
212 const struct krb_convert *p;
214 memset(&t5, 0, sizeof(t5));
215 memset(&decr_part, 0, sizeof(decr_part));
220 return RXKADBADTICKET; /* no ticket */
222 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5) {
223 code = decode_Ticket(ticket, ticket_len, &t5, &siz);
230 code = decode_EncryptedData(ticket, ticket_len, &t5.enc_part, &siz);
235 /* If kvno is null, it's probably not included because it was kvno==0
237 if (t5.enc_part.kvno == NULL) {
240 v5_serv_kvno = *t5.enc_part.kvno;
244 code = (*get_key) (get_key_rock, v5_serv_kvno, &serv_key);
248 /* Check that the key type really fit into 8 bytes */
249 switch (t5.enc_part.etype) {
250 case ETYPE_DES_CBC_CRC:
251 case ETYPE_DES_CBC_MD4:
252 case ETYPE_DES_CBC_MD5:
259 if (t5.enc_part.cipher.length > sizeof(plain)
260 || t5.enc_part.cipher.length % 8 != 0)
263 /* Decrypt data here, save in plain, assume it will shrink */
265 krb5_des_decrypt(&serv_key, t5.enc_part.etype,
266 t5.enc_part.cipher.data, t5.enc_part.cipher.length,
272 code = decode_EncTicketPart(plain, plainsiz, &decr_part, &siz);
276 /* Extract realm and principal */
277 strncpy(cell, decr_part.crealm, MAXKTCNAMELEN);
278 cell[MAXKTCNAMELEN - 1] = '\0';
280 switch (decr_part.cname.name_string.len) {
282 v5_comp0 = decr_part.cname.name_string.val[0];
283 v5_comp1 = decr_part.cname.name_string.val[1];
286 if (strncmp(p->v5_str, v5_comp0, p->len) == 0) {
288 * It is, so set the new name now, and chop off
289 * instance's domain name if requested.
291 strncpy(name, p->v4_str, MAXKTCNAMELEN);
292 name[MAXKTCNAMELEN - 1] = '\0';
293 if (p->flags & DO_REALM_CONVERSION) {
294 c = strchr(v5_comp1, '.');
295 if (!c || (c - v5_comp1) >= MAXKTCNAMELEN - 1)
297 strncpy(inst, v5_comp1, c - v5_comp1);
298 inst[c - v5_comp1] = '\0';
306 strncpy(inst, decr_part.cname.name_string.val[1], MAXKTCNAMELEN);
307 inst[MAXKTCNAMELEN - 1] = '\0';
308 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
309 name[MAXKTCNAMELEN - 1] = '\0';
313 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
314 name[MAXKTCNAMELEN - 1] = '\0';
321 * If the first part of the name_string contains a dot, punt since
322 * then we can't see the diffrence between the kerberos 5
323 * principals foo.root and foo/root later in the fileserver.
325 if (strchr(decr_part.cname.name_string.val[0], '.') != NULL)
328 /* Verify that decr_part.key is of right type */
329 switch (decr_part.key.keytype) {
330 case ETYPE_DES_CBC_CRC:
331 case ETYPE_DES_CBC_MD4:
332 case ETYPE_DES_CBC_MD5:
338 if (decr_part.key.keyvalue.length != 8)
341 /* Extract session key */
342 memcpy(session_key, decr_part.key.keyvalue.data, 8);
344 /* Check lifetimes and host addresses, flags etc */
346 time_t now = time(0); /* Use fast time package instead??? */
347 *start = decr_part.authtime;
348 if (decr_part.starttime)
349 *start = *decr_part.starttime;
351 if (*start - now > CLOCK_SKEW || decr_part.flags.invalid)
354 if (decr_part.flags.invalid)
357 if (now > decr_part.endtime)
359 *end = decr_part.endtime;
363 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5)
366 free_EncryptedData(&t5.enc_part);
367 free_EncTicketPart(&decr_part);
368 memset(&serv_key, 0, sizeof(serv_key));
372 code = RXKADUNKNOWNKEY;
381 code = RXKADBADTICKET;
387 verify_checksum_crc(void *data, size_t len, void *cksum, size_t cksumsz,
388 struct ktc_encryptionKey *key)
393 _rxkad_crc_init_table();
394 crc = _rxkad_crc_update(data, len, 0);
396 r[1] = (crc >> 8) & 0xff;
397 r[2] = (crc >> 16) & 0xff;
398 r[3] = (crc >> 24) & 0xff;
400 if (memcmp(cksum, r, 4) != 0)
407 krb5_des_decrypt(struct ktc_encryptionKey *key, int etype, void *in,
408 size_t insz, void *out, size_t * outsz)
410 int (*cksum_func) (void *, size_t, void *, size_t,
411 struct ktc_encryptionKey *);
420 des_key_sched(key, &s);
422 #define CONFOUNDERSZ 8
425 case ETYPE_DES_CBC_CRC:
426 memcpy(&ivec, key, sizeof(ivec));
428 cksum_func = verify_checksum_crc;
430 case ETYPE_DES_CBC_MD4:
431 memset(&ivec, 0, sizeof(ivec));
433 /* FIXME: cksum_func = verify_checksum_md4 */ ;
435 case ETYPE_DES_CBC_MD5:
436 memset(&ivec, 0, sizeof(ivec));
438 /* FIXME: cksum_func = verify_checksum_md5 */ ;
444 des_cbc_encrypt(in, out, insz, s, &ivec, 0);
446 memcpy(cksum, (char *)out + CONFOUNDERSZ, cksumsz);
447 memset((char *)out + CONFOUNDERSZ, 0, cksumsz);
450 ret = (*cksum_func) (out, insz, cksum, cksumsz, key);
452 *outsz = insz - CONFOUNDERSZ - cksumsz;
453 memmove(out, (char *)out + CONFOUNDERSZ + cksumsz, *outsz);