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34 #include <krb5_locl.h>
36 RCSID("$Id: rd_req.c,v 1.58 2005/08/27 05:48:57 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);
104 krb5_error_code KRB5_LIB_FUNCTION
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 /* Windows w2k and w2k3 uses this */
140 if(enc->transited.tr_type == 0 && enc->transited.contents.length == 0)
143 if(enc->transited.tr_type != DOMAIN_X500_COMPRESS)
144 return KRB5KDC_ERR_TRTYPE_NOSUPP;
146 if(enc->transited.contents.length == 0)
149 ret = krb5_domain_x500_decode(context, enc->transited.contents,
150 &realms, &num_realms,
155 ret = krb5_check_transited(context, enc->crealm,
157 realms, num_realms, NULL);
162 static krb5_error_code
163 find_etypelist(krb5_context context,
164 krb5_auth_context auth_context,
169 krb5_authdata adIfRelevant;
172 adIfRelevant.len = 0;
177 ad = auth_context->authenticator->authorization_data;
181 for (i = 0; i < ad->len; i++) {
182 if (ad->val[i].ad_type == KRB5_AUTHDATA_IF_RELEVANT) {
183 ret = decode_AD_IF_RELEVANT(ad->val[i].ad_data.data,
184 ad->val[i].ad_data.length,
190 if (adIfRelevant.len == 1 &&
191 adIfRelevant.val[0].ad_type ==
192 KRB5_AUTHDATA_GSS_API_ETYPE_NEGOTIATION) {
195 free_AD_IF_RELEVANT(&adIfRelevant);
196 adIfRelevant.len = 0;
200 if (adIfRelevant.len == 0)
203 ret = decode_EtypeList(adIfRelevant.val[0].ad_data.data,
204 adIfRelevant.val[0].ad_data.length,
208 free_AD_IF_RELEVANT(&adIfRelevant);
213 krb5_error_code KRB5_LIB_FUNCTION
214 krb5_decrypt_ticket(krb5_context context,
222 ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
228 time_t start = t.authtime;
230 krb5_timeofday (context, &now);
232 start = *t.starttime;
233 if(start - now > context->max_skew
235 && !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
236 free_EncTicketPart(&t);
237 krb5_clear_error_string (context);
238 return KRB5KRB_AP_ERR_TKT_NYV;
240 if(now - t.endtime > context->max_skew) {
241 free_EncTicketPart(&t);
242 krb5_clear_error_string (context);
243 return KRB5KRB_AP_ERR_TKT_EXPIRED;
246 if(!t.flags.transited_policy_checked) {
247 ret = check_transited(context, ticket, &t);
249 free_EncTicketPart(&t);
258 free_EncTicketPart(&t);
262 krb5_error_code KRB5_LIB_FUNCTION
263 krb5_verify_authenticator_checksum(krb5_context context,
264 krb5_auth_context ac,
270 krb5_authenticator authenticator;
273 ret = krb5_auth_con_getauthenticator (context,
278 if(authenticator->cksum == NULL)
280 ret = krb5_auth_con_getkey(context, ac, &key);
282 krb5_free_authenticator(context, &authenticator);
285 ret = krb5_crypto_init(context, key, 0, &crypto);
288 ret = krb5_verify_checksum (context,
290 KRB5_KU_AP_REQ_AUTH_CKSUM,
293 authenticator->cksum);
294 krb5_crypto_destroy(context, crypto);
296 krb5_free_authenticator(context, &authenticator);
297 krb5_free_keyblock(context, key);
302 krb5_error_code KRB5_LIB_FUNCTION
303 krb5_verify_ap_req(krb5_context context,
304 krb5_auth_context *auth_context,
306 krb5_const_principal server,
307 krb5_keyblock *keyblock,
309 krb5_flags *ap_req_options,
310 krb5_ticket **ticket)
312 return krb5_verify_ap_req2 (context,
320 KRB5_KU_AP_REQ_AUTH);
323 krb5_error_code KRB5_LIB_FUNCTION
324 krb5_verify_ap_req2(krb5_context context,
325 krb5_auth_context *auth_context,
327 krb5_const_principal server,
328 krb5_keyblock *keyblock,
330 krb5_flags *ap_req_options,
331 krb5_ticket **ticket,
332 krb5_key_usage usage)
335 krb5_auth_context ac;
339 if (auth_context && *auth_context) {
342 ret = krb5_auth_con_init (context, &ac);
347 t = malloc(sizeof(*t));
350 krb5_clear_error_string (context);
353 memset(t, 0, sizeof(*t));
355 if (ap_req->ap_options.use_session_key && ac->keyblock){
356 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
360 krb5_free_keyblock(context, ac->keyblock);
363 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
371 _krb5_principalname2krb5_principal(&t->server, ap_req->ticket.sname,
372 ap_req->ticket.realm);
373 _krb5_principalname2krb5_principal(&t->client, t->ticket.cname,
378 krb5_copy_keyblock(context, &t->ticket.key, &ac->keyblock);
380 ret = decrypt_authenticator (context,
382 &ap_req->authenticator,
389 krb5_principal p1, p2;
392 _krb5_principalname2krb5_principal(&p1,
393 ac->authenticator->cname,
394 ac->authenticator->crealm);
395 _krb5_principalname2krb5_principal(&p2,
398 res = krb5_principal_compare (context, p1, p2);
399 krb5_free_principal (context, p1);
400 krb5_free_principal (context, p2);
402 ret = KRB5KRB_AP_ERR_BADMATCH;
403 krb5_clear_error_string (context);
408 /* check addresses */
411 && ac->remote_address
412 && !krb5_address_search (context,
415 ret = KRB5KRB_AP_ERR_BADADDR;
416 krb5_clear_error_string (context);
420 if (ac->authenticator->seq_number)
421 krb5_auth_con_setremoteseqnumber(context, ac,
422 *ac->authenticator->seq_number);
424 /* XXX - Xor sequence numbers */
426 if (ac->authenticator->subkey) {
427 ret = krb5_auth_con_setremotesubkey(context, ac,
428 ac->authenticator->subkey);
433 ret = find_etypelist(context, ac, &etypes);
437 ac->keytype = ETYPE_NULL;
442 for (i = 0; i < etypes.len; i++) {
443 if (krb5_enctype_valid(context, etypes.val[i]) == 0) {
444 ac->keytype = etypes.val[i];
450 if (ap_req_options) {
452 if (ac->keytype != ETYPE_NULL)
453 *ap_req_options |= AP_OPTS_USE_SUBKEY;
454 if (ap_req->ap_options.use_session_key)
455 *ap_req_options |= AP_OPTS_USE_SESSION_KEY;
456 if (ap_req->ap_options.mutual_required)
457 *ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
463 krb5_free_ticket (context, t);
465 if (*auth_context == NULL)
468 krb5_auth_con_free (context, ac);
469 free_EtypeList(&etypes);
473 krb5_free_ticket (context, t);
474 if (auth_context == NULL || *auth_context == NULL)
475 krb5_auth_con_free (context, ac);
480 krb5_error_code KRB5_LIB_FUNCTION
481 krb5_rd_req_with_keyblock(krb5_context context,
482 krb5_auth_context *auth_context,
483 const krb5_data *inbuf,
484 krb5_const_principal server,
485 krb5_keyblock *keyblock,
486 krb5_flags *ap_req_options,
487 krb5_ticket **ticket)
492 if (*auth_context == NULL) {
493 ret = krb5_auth_con_init(context, auth_context);
498 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
502 ret = krb5_verify_ap_req(context,
511 free_AP_REQ(&ap_req);
515 static krb5_error_code
516 get_key_from_keytab(krb5_context context,
517 krb5_auth_context *auth_context,
519 krb5_const_principal server,
521 krb5_keyblock **out_key)
523 krb5_keytab_entry entry;
526 krb5_keytab real_keytab;
529 krb5_kt_default(context, &real_keytab);
531 real_keytab = keytab;
533 if (ap_req->ticket.enc_part.kvno)
534 kvno = *ap_req->ticket.enc_part.kvno;
538 ret = krb5_kt_get_entry (context,
542 ap_req->ticket.enc_part.etype,
546 ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
547 krb5_kt_free_entry (context, &entry);
550 krb5_kt_close(context, real_keytab);
555 krb5_error_code KRB5_LIB_FUNCTION
556 krb5_rd_req_return_keyblock(krb5_context context,
557 krb5_auth_context *auth_context,
558 const krb5_data *inbuf,
559 krb5_const_principal server,
561 krb5_flags *ap_req_options,
562 krb5_ticket **ticket,
563 krb5_keyblock **return_keyblock)
567 krb5_keyblock *keyblock = NULL;
568 krb5_principal service = NULL;
571 *return_keyblock = NULL;
573 if (*auth_context == NULL) {
574 ret = krb5_auth_con_init(context, auth_context);
579 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
584 _krb5_principalname2krb5_principal(&service,
586 ap_req.ticket.realm);
589 if (ap_req.ap_options.use_session_key &&
590 (*auth_context)->keyblock == NULL) {
591 krb5_set_error_string(context, "krb5_rd_req: user to user auth "
592 "without session key given");
593 ret = KRB5KRB_AP_ERR_NOKEY;
597 if((*auth_context)->keyblock == NULL){
598 ret = get_key_from_keytab(context,
607 ret = krb5_copy_keyblock(context,
608 (*auth_context)->keyblock,
614 ret = krb5_verify_ap_req(context,
623 if (ret == 0 && return_keyblock)
624 *return_keyblock = keyblock;
626 krb5_free_keyblock(context, keyblock);
629 free_AP_REQ(&ap_req);
631 krb5_free_principal(context, service);
635 krb5_error_code KRB5_LIB_FUNCTION
636 krb5_rd_req(krb5_context context,
637 krb5_auth_context *auth_context,
638 const krb5_data *inbuf,
639 krb5_const_principal server,
641 krb5_flags *ap_req_options,
642 krb5_ticket **ticket)
644 return krb5_rd_req_return_keyblock(context,