2 * Copyright (c) 1997 - 2001, 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include <krb5_locl.h>
36 RCSID("$Id: rd_req.c,v 1.47.8.3 2003/10/21 20:10:33 lha Exp $");
38 static krb5_error_code
39 decrypt_tkt_enc_part (krb5_context context,
41 EncryptedData *enc_part,
42 EncTicketPart *decr_part)
49 ret = krb5_crypto_init(context, key, 0, &crypto);
52 ret = krb5_decrypt_EncryptedData (context,
57 krb5_crypto_destroy(context, crypto);
61 ret = krb5_decode_EncTicketPart(context, plain.data, plain.length,
63 krb5_data_free (&plain);
67 static krb5_error_code
68 decrypt_authenticator (krb5_context context,
70 EncryptedData *enc_part,
71 Authenticator *authenticator,
79 ret = krb5_crypto_init(context, key, 0, &crypto);
82 ret = krb5_decrypt_EncryptedData (context,
84 usage /* KRB5_KU_AP_REQ_AUTH */,
87 /* for backwards compatibility, also try the old usage */
88 if (ret && usage == KRB5_KU_TGS_REQ_AUTH)
89 ret = krb5_decrypt_EncryptedData (context,
94 krb5_crypto_destroy(context, crypto);
98 ret = krb5_decode_Authenticator(context, plain.data, plain.length,
100 krb5_data_free (&plain);
105 krb5_decode_ap_req(krb5_context context,
106 const krb5_data *inbuf,
111 ret = decode_AP_REQ(inbuf->data, inbuf->length, ap_req, &len);
114 if (ap_req->pvno != 5){
116 krb5_clear_error_string (context);
117 return KRB5KRB_AP_ERR_BADVERSION;
119 if (ap_req->msg_type != krb_ap_req){
121 krb5_clear_error_string (context);
122 return KRB5KRB_AP_ERR_MSG_TYPE;
124 if (ap_req->ticket.tkt_vno != 5){
126 krb5_clear_error_string (context);
127 return KRB5KRB_AP_ERR_BADVERSION;
132 static krb5_error_code
133 check_transited(krb5_context context, Ticket *ticket, EncTicketPart *enc)
139 if(enc->transited.tr_type != DOMAIN_X500_COMPRESS)
140 return KRB5KDC_ERR_TRTYPE_NOSUPP;
142 if(enc->transited.contents.length == 0)
145 ret = krb5_domain_x500_decode(context, enc->transited.contents,
146 &realms, &num_realms,
151 ret = krb5_check_transited(context, enc->crealm,
153 realms, num_realms, NULL);
159 krb5_decrypt_ticket(krb5_context context,
167 ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
173 time_t start = t.authtime;
175 krb5_timeofday (context, &now);
177 start = *t.starttime;
178 if(start - now > context->max_skew
180 && !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
181 free_EncTicketPart(&t);
182 krb5_clear_error_string (context);
183 return KRB5KRB_AP_ERR_TKT_NYV;
185 if(now - t.endtime > context->max_skew) {
186 free_EncTicketPart(&t);
187 krb5_clear_error_string (context);
188 return KRB5KRB_AP_ERR_TKT_EXPIRED;
191 if(!t.flags.transited_policy_checked) {
192 ret = check_transited(context, ticket, &t);
194 free_EncTicketPart(&t);
203 free_EncTicketPart(&t);
208 krb5_verify_authenticator_checksum(krb5_context context,
209 krb5_auth_context ac,
215 krb5_authenticator authenticator;
218 ret = krb5_auth_con_getauthenticator (context,
223 if(authenticator->cksum == NULL)
225 ret = krb5_auth_con_getkey(context, ac, &key);
227 krb5_free_authenticator(context, &authenticator);
230 ret = krb5_crypto_init(context, key, 0, &crypto);
233 ret = krb5_verify_checksum (context,
235 KRB5_KU_AP_REQ_AUTH_CKSUM,
238 authenticator->cksum);
239 krb5_crypto_destroy(context, crypto);
241 krb5_free_authenticator(context, &authenticator);
242 krb5_free_keyblock(context, key);
248 krb5_verify_ap_req(krb5_context context,
249 krb5_auth_context *auth_context,
251 krb5_const_principal server,
252 krb5_keyblock *keyblock,
254 krb5_flags *ap_req_options,
255 krb5_ticket **ticket)
257 return krb5_verify_ap_req2 (context,
265 KRB5_KU_AP_REQ_AUTH);
269 krb5_verify_ap_req2(krb5_context context,
270 krb5_auth_context *auth_context,
272 krb5_const_principal server,
273 krb5_keyblock *keyblock,
275 krb5_flags *ap_req_options,
276 krb5_ticket **ticket,
277 krb5_key_usage usage)
280 krb5_auth_context ac;
283 if (auth_context && *auth_context) {
286 ret = krb5_auth_con_init (context, &ac);
291 if (ap_req->ap_options.use_session_key && ac->keyblock){
292 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
296 krb5_free_keyblock(context, ac->keyblock);
299 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
307 principalname2krb5_principal(&t.server, ap_req->ticket.sname,
308 ap_req->ticket.realm);
309 principalname2krb5_principal(&t.client, t.ticket.cname,
314 krb5_copy_keyblock(context, &t.ticket.key, &ac->keyblock);
316 ret = decrypt_authenticator (context,
318 &ap_req->authenticator,
325 krb5_principal p1, p2;
328 principalname2krb5_principal(&p1,
329 ac->authenticator->cname,
330 ac->authenticator->crealm);
331 principalname2krb5_principal(&p2,
334 res = krb5_principal_compare (context, p1, p2);
335 krb5_free_principal (context, p1);
336 krb5_free_principal (context, p2);
338 ret = KRB5KRB_AP_ERR_BADMATCH;
339 krb5_clear_error_string (context);
344 /* check addresses */
347 && ac->remote_address
348 && !krb5_address_search (context,
351 ret = KRB5KRB_AP_ERR_BADADDR;
352 krb5_clear_error_string (context);
356 if (ac->authenticator->seq_number)
357 krb5_auth_con_setremoteseqnumber(context, ac,
358 *ac->authenticator->seq_number);
360 /* XXX - Xor sequence numbers */
362 if (ac->authenticator->subkey) {
363 ret = krb5_auth_con_setremotesubkey(context, ac,
364 ac->authenticator->subkey);
369 if (ap_req_options) {
371 if (ap_req->ap_options.use_session_key)
372 *ap_req_options |= AP_OPTS_USE_SESSION_KEY;
373 if (ap_req->ap_options.mutual_required)
374 *ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
378 *ticket = malloc(sizeof(**ticket));
381 krb5_free_ticket (context, &t);
383 if (*auth_context == NULL)
386 krb5_auth_con_free (context, ac);
389 krb5_free_ticket (context, &t);
391 if (auth_context == NULL || *auth_context == NULL)
392 krb5_auth_con_free (context, ac);
398 krb5_rd_req_with_keyblock(krb5_context context,
399 krb5_auth_context *auth_context,
400 const krb5_data *inbuf,
401 krb5_const_principal server,
402 krb5_keyblock *keyblock,
403 krb5_flags *ap_req_options,
404 krb5_ticket **ticket)
409 if (*auth_context == NULL) {
410 ret = krb5_auth_con_init(context, auth_context);
415 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
419 ret = krb5_verify_ap_req(context,
428 free_AP_REQ(&ap_req);
432 static krb5_error_code
433 get_key_from_keytab(krb5_context context,
434 krb5_auth_context *auth_context,
436 krb5_const_principal server,
438 krb5_keyblock **out_key)
440 krb5_keytab_entry entry;
443 krb5_keytab real_keytab;
446 krb5_kt_default(context, &real_keytab);
448 real_keytab = keytab;
450 if (ap_req->ticket.enc_part.kvno)
451 kvno = *ap_req->ticket.enc_part.kvno;
455 ret = krb5_kt_get_entry (context,
459 ap_req->ticket.enc_part.etype,
463 ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
464 krb5_kt_free_entry (context, &entry);
467 krb5_kt_close(context, real_keytab);
473 krb5_rd_req(krb5_context context,
474 krb5_auth_context *auth_context,
475 const krb5_data *inbuf,
476 krb5_const_principal server,
478 krb5_flags *ap_req_options,
479 krb5_ticket **ticket)
483 krb5_keyblock *keyblock = NULL;
484 krb5_principal service = NULL;
486 if (*auth_context == NULL) {
487 ret = krb5_auth_con_init(context, auth_context);
492 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
497 principalname2krb5_principal(&service,
499 ap_req.ticket.realm);
502 if (ap_req.ap_options.use_session_key &&
503 (*auth_context)->keyblock == NULL) {
504 krb5_set_error_string(context, "krb5_rd_req: user to user auth "
505 "without session key given");
506 ret = KRB5KRB_AP_ERR_NOKEY;
510 if((*auth_context)->keyblock == NULL){
511 ret = get_key_from_keytab(context,
520 ret = krb5_copy_keyblock(context,
521 (*auth_context)->keyblock,
527 ret = krb5_verify_ap_req(context,
537 krb5_free_keyblock(context, keyblock);
540 free_AP_REQ(&ap_req);
542 krb5_free_principal(context, service);