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>
58 #include <afs/param.h>
60 #ifdef IGNORE_SOME_GCC_WARNINGS
61 # pragma GCC diagnostic warning "-Wimplicit-function-declaration"
65 #include <sys/types.h>
69 #include <netinet/in.h>
74 #include "lifetimes.h"
77 #include "v5gen-rewrite.h"
86 * Principal conversion Taken from src/lib/krb5/krb/conv_princ from MIT Kerberos. If you
87 * find a need to change the services here, please consider opening a
88 * bug with MIT by sending mail to krb5-bugs@mit.edu.
91 extern afs_int32 des_cbc_encrypt(void * in, void * out,
93 des_key_schedule key, des_cblock *iv,
95 extern int des_key_sched(des_cblock k, des_key_schedule schedule);
104 #define DO_REALM_CONVERSION 0x00000001
107 * Kadmin doesn't do realm conversion because it's currently
108 * kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
110 * "Realm conversion" is a bit of a misnomer; really, the v5 name is
111 * using a FQDN or something that looks like it, where the v4 name is
112 * just using the first label. Sometimes that second principal name
113 * component is a hostname, sometimes the realm name, sometimes it's
116 * This list should probably be more configurable, and more than
117 * likely on a per-realm basis, so locally-defined services can be
120 static const struct krb_convert sconv_list[] = {
121 /* Realm conversion, Change service name */
122 #define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
123 /* Realm conversion */
124 #define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
125 /* No Realm conversion */
126 #define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
177 krb5_des_decrypt(struct ktc_encryptionKey *, int, void *, size_t, void *,
184 tkt_DecodeTicket5(char *ticket, afs_int32 ticket_len,
185 int (*get_key) (void *, int, struct ktc_encryptionKey *),
186 char *get_key_rock, int serv_kvno, char *name, char *inst,
187 char *cell, struct ktc_encryptionKey *session_key, afs_int32 * host,
188 afs_uint32 * start, afs_uint32 * end, afs_int32 disableCheckdot)
190 char plain[MAXKRB5TICKETLEN];
191 struct ktc_encryptionKey serv_key;
192 Ticket t5; /* Must free */
193 EncTicketPart decr_part; /* Must free */
195 size_t siz, plainsiz;
197 char *v5_comp0, *v5_comp1, *c;
198 const struct krb_convert *p;
200 memset(&t5, 0, sizeof(t5));
201 memset(&decr_part, 0, sizeof(decr_part));
206 return RXKADBADTICKET; /* no ticket */
208 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5) {
209 code = decode_Ticket((unsigned char *)ticket, ticket_len, &t5, &siz);
216 code = decode_EncryptedData((unsigned char *)ticket, ticket_len, &t5.enc_part, &siz);
221 /* If kvno is null, it's probably not included because it was kvno==0
223 if (t5.enc_part.kvno == NULL) {
226 v5_serv_kvno = *t5.enc_part.kvno;
229 /* Check that the key type really fit into 8 bytes */
230 switch (t5.enc_part.etype) {
231 case ETYPE_DES_CBC_CRC:
232 case ETYPE_DES_CBC_MD4:
233 case ETYPE_DES_CBC_MD5:
240 if (t5.enc_part.cipher.length > sizeof(plain)
241 || t5.enc_part.cipher.length % 8 != 0)
244 code = (*get_key) (get_key_rock, v5_serv_kvno, &serv_key);
248 /* Decrypt data here, save in plain, assume it will shrink */
250 krb5_des_decrypt(&serv_key, t5.enc_part.etype,
251 t5.enc_part.cipher.data, t5.enc_part.cipher.length,
257 code = decode_EncTicketPart((unsigned char *)plain, plainsiz, &decr_part, &siz);
261 /* Extract realm and principal */
262 strncpy(cell, decr_part.crealm, MAXKTCNAMELEN);
263 cell[MAXKTCNAMELEN - 1] = '\0';
265 switch (decr_part.cname.name_string.len) {
267 v5_comp0 = decr_part.cname.name_string.val[0];
268 v5_comp1 = decr_part.cname.name_string.val[1];
271 if (strcmp(p->v5_str, v5_comp0) == 0) {
273 * It is, so set the new name now, and chop off
274 * instance's domain name if requested.
276 strncpy(name, p->v4_str, MAXKTCNAMELEN);
277 name[MAXKTCNAMELEN - 1] = '\0';
278 if (p->flags & DO_REALM_CONVERSION) {
279 c = strchr(v5_comp1, '.');
280 if (!c || (c - v5_comp1) >= MAXKTCNAMELEN - 1)
282 strncpy(inst, v5_comp1, c - v5_comp1);
283 inst[c - v5_comp1] = '\0';
291 strncpy(inst, decr_part.cname.name_string.val[1], MAXKTCNAMELEN);
292 inst[MAXKTCNAMELEN - 1] = '\0';
293 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
294 name[MAXKTCNAMELEN - 1] = '\0';
298 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
299 name[MAXKTCNAMELEN - 1] = '\0';
305 if (!disableCheckdot) {
307 * If the first part of the name_string contains a dot, punt since
308 * then we can't see the diffrence between the kerberos 5
309 * principals foo.root and foo/root later in the fileserver.
311 if (strchr(decr_part.cname.name_string.val[0], '.') != NULL)
315 /* Verify that decr_part.key is of right type */
316 switch (decr_part.key.keytype) {
317 case ETYPE_DES_CBC_CRC:
318 case ETYPE_DES_CBC_MD4:
319 case ETYPE_DES_CBC_MD5:
325 if (decr_part.key.keyvalue.length != 8)
328 /* Extract session key */
329 memcpy(session_key, decr_part.key.keyvalue.data, 8);
331 /* Check lifetimes and host addresses, flags etc */
333 time_t now = time(0); /* Use fast time package instead??? */
334 *start = decr_part.authtime;
335 if (decr_part.starttime)
336 *start = *decr_part.starttime;
338 if (*start - now > CLOCK_SKEW || decr_part.flags.invalid)
341 if (decr_part.flags.invalid)
344 if (now > decr_part.endtime)
346 *end = decr_part.endtime;
350 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5)
353 free_EncryptedData(&t5.enc_part);
354 free_EncTicketPart(&decr_part);
355 memset(&serv_key, 0, sizeof(serv_key));
359 code = RXKADUNKNOWNKEY;
368 code = RXKADBADTICKET;
374 verify_checksum_md4(void *data, size_t len,
375 void *cksum, size_t cksumsz,
376 struct ktc_encryptionKey *key)
379 unsigned char tmp[16];
382 MD4_Update(&md4, data, len);
383 MD4_Final(tmp, &md4);
385 if (memcmp(tmp, cksum, cksumsz) != 0)
391 verify_checksum_md5(void *data, size_t len,
392 void *cksum, size_t cksumsz,
393 struct ktc_encryptionKey *key)
396 unsigned char tmp[16];
399 MD5_Update(&md5, data, len);
400 MD5_Final(tmp, &md5);
402 if (memcmp(tmp, cksum, cksumsz) != 0)
408 verify_checksum_crc(void *data, size_t len, void *cksum, size_t cksumsz,
409 struct ktc_encryptionKey *key)
414 _rxkad_crc_init_table();
415 crc = _rxkad_crc_update(data, len, 0);
417 r[1] = (crc >> 8) & 0xff;
418 r[2] = (crc >> 16) & 0xff;
419 r[3] = (crc >> 24) & 0xff;
421 if (memcmp(cksum, r, 4) != 0)
428 krb5_des_decrypt(struct ktc_encryptionKey *key, int etype, void *in,
429 size_t insz, void *out, size_t * outsz)
431 int (*cksum_func) (void *, size_t, void *, size_t,
432 struct ktc_encryptionKey *);
437 int ret = 1; /* failure */
441 des_key_sched(ktc_to_cblock(key), (struct des_ks_struct *)&s);
443 #define CONFOUNDERSZ 8
446 case ETYPE_DES_CBC_CRC:
447 memcpy(&ivec, key, sizeof(ivec));
449 cksum_func = verify_checksum_crc;
451 case ETYPE_DES_CBC_MD4:
452 memset(&ivec, 0, sizeof(ivec));
454 cksum_func = verify_checksum_md4;
456 case ETYPE_DES_CBC_MD5:
457 memset(&ivec, 0, sizeof(ivec));
459 cksum_func = verify_checksum_md5;
465 des_cbc_encrypt(in, out, insz, s, &ivec, 0);
467 memcpy(cksum, (char *)out + CONFOUNDERSZ, cksumsz);
468 memset((char *)out + CONFOUNDERSZ, 0, cksumsz);
471 ret = (*cksum_func) (out, insz, cksum, cksumsz, key);
473 *outsz = insz - CONFOUNDERSZ - cksumsz;
474 memmove(out, (char *)out + CONFOUNDERSZ + cksumsz, *outsz);