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>
64 #ifdef IGNORE_SOME_GCC_WARNINGS
65 # pragma GCC diagnostic warning "-Wimplicit-function-declaration"
69 #include "../afs/sysincludes.h"
70 #include "../afs/afsincludes.h"
71 #include "../afs/stds.h"
72 #include "../rx/xdr.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>
87 #include "lifetimes.h"
89 #endif /* defined(UKERNEL) */
91 #include "v5gen-rewrite.h"
92 #include "asn1-common.h"
101 * Principal conversion Taken from src/lib/krb5/krb/conv_princ from MIT Kerberos. If you
102 * find a need to change the services here, please consider opening a
103 * bug with MIT by sending mail to krb5-bugs@mit.edu.
106 extern afs_int32 des_cbc_encrypt(void * in, void * out,
107 register afs_int32 length,
108 des_key_schedule key, des_cblock *iv,
110 extern int des_key_sched(register des_cblock k, des_key_schedule schedule);
119 #define DO_REALM_CONVERSION 0x00000001
122 * Kadmin doesn't do realm conversion because it's currently
123 * kadmin/REALM.NAME. Zephyr doesn't because it's just zephyr/zephyr.
125 * "Realm conversion" is a bit of a misnomer; really, the v5 name is
126 * using a FQDN or something that looks like it, where the v4 name is
127 * just using the first label. Sometimes that second principal name
128 * component is a hostname, sometimes the realm name, sometimes it's
131 * This list should probably be more configurable, and more than
132 * likely on a per-realm basis, so locally-defined services can be
135 static const struct krb_convert sconv_list[] = {
136 /* Realm conversion, Change service name */
137 #define RC(V5NAME,V4NAME) { V5NAME, V4NAME, DO_REALM_CONVERSION, sizeof(V5NAME)-1 }
138 /* Realm conversion */
139 #define R(NAME) { NAME, NAME, DO_REALM_CONVERSION, sizeof(NAME)-1 }
140 /* No Realm conversion */
141 #define NR(NAME) { NAME, NAME, 0, sizeof(NAME)-1 }
192 krb5_des_decrypt(struct ktc_encryptionKey *, int, void *, size_t, void *,
199 tkt_DecodeTicket5(char *ticket, afs_int32 ticket_len,
200 int (*get_key) (void *, int, struct ktc_encryptionKey *),
201 char *get_key_rock, int serv_kvno, char *name, char *inst,
202 char *cell, struct ktc_encryptionKey *session_key, afs_int32 * host,
203 afs_uint32 * start, afs_uint32 * end, afs_int32 disableCheckdot)
205 char plain[MAXKRB5TICKETLEN];
206 struct ktc_encryptionKey serv_key;
207 Ticket t5; /* Must free */
208 EncTicketPart decr_part; /* Must free */
210 size_t siz, plainsiz;
212 char *v5_comp0, *v5_comp1, *c;
213 const struct krb_convert *p;
215 memset(&t5, 0, sizeof(t5));
216 memset(&decr_part, 0, sizeof(decr_part));
221 return RXKADBADTICKET; /* no ticket */
223 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5) {
224 code = decode_Ticket((unsigned char *)ticket, ticket_len, &t5, &siz);
231 code = decode_EncryptedData((unsigned char *)ticket, ticket_len, &t5.enc_part, &siz);
236 /* If kvno is null, it's probably not included because it was kvno==0
238 if (t5.enc_part.kvno == NULL) {
241 v5_serv_kvno = *t5.enc_part.kvno;
244 /* Check that the key type really fit into 8 bytes */
245 switch (t5.enc_part.etype) {
246 case ETYPE_DES_CBC_CRC:
247 case ETYPE_DES_CBC_MD4:
248 case ETYPE_DES_CBC_MD5:
255 if (t5.enc_part.cipher.length > sizeof(plain)
256 || t5.enc_part.cipher.length % 8 != 0)
259 code = (*get_key) (get_key_rock, v5_serv_kvno, &serv_key);
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((unsigned char *)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 (strcmp(p->v5_str, v5_comp0) == 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';
320 if (!disableCheckdot) {
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)
330 /* Verify that decr_part.key is of right type */
331 switch (decr_part.key.keytype) {
332 case ETYPE_DES_CBC_CRC:
333 case ETYPE_DES_CBC_MD4:
334 case ETYPE_DES_CBC_MD5:
340 if (decr_part.key.keyvalue.length != 8)
343 /* Extract session key */
344 memcpy(session_key, decr_part.key.keyvalue.data, 8);
346 /* Check lifetimes and host addresses, flags etc */
348 time_t now = time(0); /* Use fast time package instead??? */
349 *start = decr_part.authtime;
350 if (decr_part.starttime)
351 *start = *decr_part.starttime;
353 if (*start - now > CLOCK_SKEW || decr_part.flags.invalid)
356 if (decr_part.flags.invalid)
359 if (now > decr_part.endtime)
361 *end = decr_part.endtime;
365 if (serv_kvno == RXKAD_TKT_TYPE_KERBEROS_V5)
368 free_EncryptedData(&t5.enc_part);
369 free_EncTicketPart(&decr_part);
370 memset(&serv_key, 0, sizeof(serv_key));
374 code = RXKADUNKNOWNKEY;
383 code = RXKADBADTICKET;
389 verify_checksum_md4(void *data, size_t len,
390 void *cksum, size_t cksumsz,
391 struct ktc_encryptionKey *key)
394 unsigned char tmp[16];
397 MD4_Update(&md4, data, len);
398 MD4_Final(tmp, &md4);
400 if (memcmp(tmp, cksum, cksumsz) != 0)
406 verify_checksum_md5(void *data, size_t len,
407 void *cksum, size_t cksumsz,
408 struct ktc_encryptionKey *key)
411 unsigned char tmp[16];
414 MD5_Update(&md5, data, len);
415 MD5_Final(tmp, &md5);
417 if (memcmp(tmp, cksum, cksumsz) != 0)
423 verify_checksum_crc(void *data, size_t len, void *cksum, size_t cksumsz,
424 struct ktc_encryptionKey *key)
429 _rxkad_crc_init_table();
430 crc = _rxkad_crc_update(data, len, 0);
432 r[1] = (crc >> 8) & 0xff;
433 r[2] = (crc >> 16) & 0xff;
434 r[3] = (crc >> 24) & 0xff;
436 if (memcmp(cksum, r, 4) != 0)
443 krb5_des_decrypt(struct ktc_encryptionKey *key, int etype, void *in,
444 size_t insz, void *out, size_t * outsz)
446 int (*cksum_func) (void *, size_t, void *, size_t,
447 struct ktc_encryptionKey *);
452 int ret = 1; /* failure */
456 des_key_sched(ktc_to_cblock(key), (struct des_ks_struct *)&s);
458 #define CONFOUNDERSZ 8
461 case ETYPE_DES_CBC_CRC:
462 memcpy(&ivec, key, sizeof(ivec));
464 cksum_func = verify_checksum_crc;
466 case ETYPE_DES_CBC_MD4:
467 memset(&ivec, 0, sizeof(ivec));
469 cksum_func = verify_checksum_md4;
471 case ETYPE_DES_CBC_MD5:
472 memset(&ivec, 0, sizeof(ivec));
474 cksum_func = verify_checksum_md5;
480 des_cbc_encrypt(in, out, insz, s, &ivec, 0);
482 memcpy(cksum, (char *)out + CONFOUNDERSZ, cksumsz);
483 memset((char *)out + CONFOUNDERSZ, 0, cksumsz);
486 ret = (*cksum_func) (out, insz, cksum, cksumsz, key);
488 *outsz = insz - CONFOUNDERSZ - cksumsz;
489 memmove(out, (char *)out + CONFOUNDERSZ + cksumsz, *outsz);