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57 #include <afsconfig.h>
58 #include <afs/param.h>
63 #ifdef IGNORE_SOME_GCC_WARNINGS
64 # pragma GCC diagnostic warning "-Wimplicit-function-declaration"
70 #include <hcrypto/md4.h>
71 #include <hcrypto/md5.h>
72 #include <hcrypto/des.h>
74 #include "lifetimes.h"
76 #include "rxkad_convert.h"
78 #include "v5gen-rewrite.h"
85 * Principal conversion Taken from src/lib/krb5/krb/conv_princ from MIT Kerberos. If you
86 * find a need to change the services here, please consider opening a
87 * bug with MIT by sending mail to krb5-bugs@mit.edu.
97 #define DO_REALM_CONVERSION 0x00000001
100 * Kadmin doesn't do realm conversion because it's currently
101 * kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
103 * "Realm conversion" is a bit of a misnomer; really, the v5 name is
104 * using a FQDN or something that looks like it, where the v4 name is
105 * just using the first label. Sometimes that second principal name
106 * component is a hostname, sometimes the realm name, sometimes it's
109 * This list should probably be more configurable, and more than
110 * likely on a per-realm basis, so locally-defined services can be
113 static const struct krb_convert sconv_list[] = {
114 /* Realm conversion, Change service name */
115 #define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
116 /* Realm conversion */
117 #define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
118 /* No Realm conversion */
119 #define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
170 krb5_des_decrypt(struct ktc_encryptionKey *, int, void *, size_t, void *,
177 tkt_DecodeTicket5(char *ticket, afs_int32 ticket_len,
178 int (*get_key) (void *, int, struct ktc_encryptionKey *),
179 char *get_key_rock, int serv_kvno, char *name, char *inst,
180 char *cell, struct ktc_encryptionKey *session_key, afs_int32 * host,
181 afs_uint32 * start, afs_uint32 * end, afs_int32 disableCheckdot)
183 char plain[MAXKRB5TICKETLEN];
184 struct ktc_encryptionKey serv_key;
185 Ticket t5; /* Must free */
186 EncTicketPart decr_part; /* Must free */
188 size_t siz, plainsiz;
190 char *v5_comp0, *v5_comp1, *c;
191 const struct krb_convert *p;
193 memset(&t5, 0, sizeof(t5));
194 memset(&decr_part, 0, sizeof(decr_part));
199 return RXKADBADTICKET; /* no ticket */
201 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5) {
202 code = decode_Ticket((unsigned char *)ticket, ticket_len, &t5, &siz);
209 code = decode_EncryptedData((unsigned char *)ticket, ticket_len, &t5.enc_part, &siz);
214 /* If kvno is null, it's probably not included because it was kvno==0
216 if (t5.enc_part.kvno == NULL) {
219 v5_serv_kvno = *t5.enc_part.kvno;
222 /* Check that the key type really fit into 8 bytes */
223 switch (t5.enc_part.etype) {
224 case ETYPE_DES_CBC_CRC:
225 case ETYPE_DES_CBC_MD4:
226 case ETYPE_DES_CBC_MD5:
233 if (t5.enc_part.cipher.length > sizeof(plain)
234 || t5.enc_part.cipher.length % 8 != 0)
237 code = (*get_key) (get_key_rock, v5_serv_kvno, &serv_key);
241 /* Decrypt data here, save in plain, assume it will shrink */
243 krb5_des_decrypt(&serv_key, t5.enc_part.etype,
244 t5.enc_part.cipher.data, t5.enc_part.cipher.length,
250 code = decode_EncTicketPart((unsigned char *)plain, plainsiz, &decr_part, &siz);
254 /* Extract realm and principal */
255 strncpy(cell, decr_part.crealm, MAXKTCNAMELEN);
256 cell[MAXKTCNAMELEN - 1] = '\0';
258 switch (decr_part.cname.name_string.len) {
260 v5_comp0 = decr_part.cname.name_string.val[0];
261 v5_comp1 = decr_part.cname.name_string.val[1];
264 if (strcmp(p->v5_str, v5_comp0) == 0) {
266 * It is, so set the new name now, and chop off
267 * instance's domain name if requested.
269 strncpy(name, p->v4_str, MAXKTCNAMELEN);
270 name[MAXKTCNAMELEN - 1] = '\0';
271 if (p->flags & DO_REALM_CONVERSION) {
272 c = strchr(v5_comp1, '.');
273 if (!c || (c - v5_comp1) >= MAXKTCNAMELEN - 1)
275 strncpy(inst, v5_comp1, c - v5_comp1);
276 inst[c - v5_comp1] = '\0';
284 strncpy(inst, decr_part.cname.name_string.val[1], MAXKTCNAMELEN);
285 inst[MAXKTCNAMELEN - 1] = '\0';
286 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
287 name[MAXKTCNAMELEN - 1] = '\0';
291 strncpy(name, decr_part.cname.name_string.val[0], MAXKTCNAMELEN);
292 name[MAXKTCNAMELEN - 1] = '\0';
298 if (!disableCheckdot) {
300 * If the first part of the name_string contains a dot, punt since
301 * then we can't see the diffrence between the kerberos 5
302 * principals foo.root and foo/root later in the fileserver.
304 if (strchr(decr_part.cname.name_string.val[0], '.') != NULL)
308 /* Verify that decr_part.key is of right type */
309 switch (decr_part.key.keytype) {
310 case ETYPE_DES_CBC_CRC:
311 case ETYPE_DES_CBC_MD4:
312 case ETYPE_DES_CBC_MD5:
318 if (decr_part.key.keyvalue.length != 8)
321 /* Extract session key */
322 memcpy(session_key, decr_part.key.keyvalue.data, 8);
324 /* Check lifetimes and host addresses, flags etc */
326 time_t now = time(0); /* Use fast time package instead??? */
327 *start = decr_part.authtime;
328 if (decr_part.starttime)
329 *start = *decr_part.starttime;
331 if (*start - now > CLOCK_SKEW || decr_part.flags.invalid)
334 if (decr_part.flags.invalid)
337 if (now > decr_part.endtime)
339 *end = decr_part.endtime;
343 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5)
346 free_EncryptedData(&t5.enc_part);
347 free_EncTicketPart(&decr_part);
348 memset(&serv_key, 0, sizeof(serv_key));
352 code = RXKADUNKNOWNKEY;
361 code = RXKADBADTICKET;
367 verify_checksum_md4(void *data, size_t len,
368 void *cksum, size_t cksumsz,
369 struct ktc_encryptionKey *key)
372 unsigned char tmp[16];
375 MD4_Update(&md4, data, len);
376 MD4_Final(tmp, &md4);
378 if (memcmp(tmp, cksum, cksumsz) != 0)
384 verify_checksum_md5(void *data, size_t len,
385 void *cksum, size_t cksumsz,
386 struct ktc_encryptionKey *key)
389 unsigned char tmp[16];
392 MD5_Update(&md5, data, len);
393 MD5_Final(tmp, &md5);
395 if (memcmp(tmp, cksum, cksumsz) != 0)
401 verify_checksum_crc(void *data, size_t len, void *cksum, size_t cksumsz,
402 struct ktc_encryptionKey *key)
407 _rxkad_crc_init_table();
408 crc = _rxkad_crc_update(data, len, 0);
410 r[1] = (crc >> 8) & 0xff;
411 r[2] = (crc >> 16) & 0xff;
412 r[3] = (crc >> 24) & 0xff;
414 if (memcmp(cksum, r, 4) != 0)
421 krb5_des_decrypt(struct ktc_encryptionKey *key, int etype, void *in,
422 size_t insz, void *out, size_t * outsz)
424 int (*cksum_func) (void *, size_t, void *, size_t,
425 struct ktc_encryptionKey *);
430 int ret = 1; /* failure */
434 DES_key_sched(ktc_to_cblock(key), &s);
436 #define CONFOUNDERSZ 8
439 case ETYPE_DES_CBC_CRC:
440 memcpy(&ivec, key, sizeof(ivec));
442 cksum_func = verify_checksum_crc;
444 case ETYPE_DES_CBC_MD4:
445 memset(&ivec, 0, sizeof(ivec));
447 cksum_func = verify_checksum_md4;
449 case ETYPE_DES_CBC_MD5:
450 memset(&ivec, 0, sizeof(ivec));
452 cksum_func = verify_checksum_md5;
458 DES_cbc_encrypt(in, out, insz, &s, &ivec, 0);
460 memcpy(cksum, (char *)out + CONFOUNDERSZ, cksumsz);
461 memset((char *)out + CONFOUNDERSZ, 0, cksumsz);
464 ret = (*cksum_func) (out, insz, cksum, cksumsz, key);
466 *outsz = insz - CONFOUNDERSZ - cksumsz;
467 memmove(out, (char *)out + CONFOUNDERSZ + cksumsz, *outsz);