2 * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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7 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
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14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
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18 * may be used to endorse or promote products derived from this software
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34 #include <krb5_locl.h>
36 RCSID("$Id: rd_req.c,v 1.47 2001/06/18 02:48:18 assar 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;
133 krb5_decrypt_ticket(krb5_context context,
141 ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
147 time_t start = t.authtime;
149 krb5_timeofday (context, &now);
151 start = *t.starttime;
152 if(start - now > context->max_skew
154 && !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
155 free_EncTicketPart(&t);
156 krb5_clear_error_string (context);
157 return KRB5KRB_AP_ERR_TKT_NYV;
159 if(now - t.endtime > context->max_skew) {
160 free_EncTicketPart(&t);
161 krb5_clear_error_string (context);
162 return KRB5KRB_AP_ERR_TKT_EXPIRED;
169 free_EncTicketPart(&t);
174 krb5_verify_authenticator_checksum(krb5_context context,
175 krb5_auth_context ac,
181 krb5_authenticator authenticator;
184 ret = krb5_auth_con_getauthenticator (context,
189 if(authenticator->cksum == NULL)
191 ret = krb5_auth_con_getkey(context, ac, &key);
193 krb5_free_authenticator(context, &authenticator);
196 ret = krb5_crypto_init(context, key, 0, &crypto);
199 ret = krb5_verify_checksum (context,
201 KRB5_KU_AP_REQ_AUTH_CKSUM,
204 authenticator->cksum);
205 krb5_crypto_destroy(context, crypto);
207 krb5_free_authenticator(context, &authenticator);
208 krb5_free_keyblock(context, key);
213 static krb5_error_code
214 check_transited(krb5_context context,
221 if(ticket->ticket.transited.tr_type != DOMAIN_X500_COMPRESS)
222 return KRB5KDC_ERR_TRTYPE_NOSUPP;
224 ret = krb5_domain_x500_decode(ticket->ticket.transited.contents,
225 &realms, &num_realms,
226 ticket->client->realm,
227 ticket->server->realm);
230 ret = krb5_check_transited_realms(context, realms, num_realms, NULL);
237 krb5_verify_ap_req(krb5_context context,
238 krb5_auth_context *auth_context,
240 krb5_const_principal server,
241 krb5_keyblock *keyblock,
243 krb5_flags *ap_req_options,
244 krb5_ticket **ticket)
246 return krb5_verify_ap_req2 (context,
254 KRB5_KU_AP_REQ_AUTH);
258 krb5_verify_ap_req2(krb5_context context,
259 krb5_auth_context *auth_context,
261 krb5_const_principal server,
262 krb5_keyblock *keyblock,
264 krb5_flags *ap_req_options,
265 krb5_ticket **ticket,
266 krb5_key_usage usage)
269 krb5_auth_context ac;
272 if (auth_context && *auth_context) {
275 ret = krb5_auth_con_init (context, &ac);
280 if (ap_req->ap_options.use_session_key && ac->keyblock){
281 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
285 krb5_free_keyblock(context, ac->keyblock);
288 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
296 principalname2krb5_principal(&t.server, ap_req->ticket.sname,
297 ap_req->ticket.realm);
298 principalname2krb5_principal(&t.client, t.ticket.cname,
303 krb5_copy_keyblock(context, &t.ticket.key, &ac->keyblock);
305 ret = decrypt_authenticator (context,
307 &ap_req->authenticator,
314 krb5_principal p1, p2;
317 principalname2krb5_principal(&p1,
318 ac->authenticator->cname,
319 ac->authenticator->crealm);
320 principalname2krb5_principal(&p2,
323 res = krb5_principal_compare (context, p1, p2);
324 krb5_free_principal (context, p1);
325 krb5_free_principal (context, p2);
327 ret = KRB5KRB_AP_ERR_BADMATCH;
328 krb5_clear_error_string (context);
333 /* check addresses */
336 && ac->remote_address
337 && !krb5_address_search (context,
340 ret = KRB5KRB_AP_ERR_BADADDR;
341 krb5_clear_error_string (context);
345 if (ac->authenticator->seq_number)
346 krb5_auth_con_setremoteseqnumber(context, ac,
347 *ac->authenticator->seq_number);
349 /* XXX - Xor sequence numbers */
351 if (ac->authenticator->subkey) {
352 ret = krb5_auth_con_setremotesubkey(context, ac,
353 ac->authenticator->subkey);
358 if (ap_req_options) {
360 if (ap_req->ap_options.use_session_key)
361 *ap_req_options |= AP_OPTS_USE_SESSION_KEY;
362 if (ap_req->ap_options.mutual_required)
363 *ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
367 *ticket = malloc(sizeof(**ticket));
370 krb5_free_ticket (context, &t);
372 if (*auth_context == NULL)
375 krb5_auth_con_free (context, ac);
378 krb5_free_ticket (context, &t);
380 if (auth_context == NULL || *auth_context == NULL)
381 krb5_auth_con_free (context, ac);
387 krb5_rd_req_with_keyblock(krb5_context context,
388 krb5_auth_context *auth_context,
389 const krb5_data *inbuf,
390 krb5_const_principal server,
391 krb5_keyblock *keyblock,
392 krb5_flags *ap_req_options,
393 krb5_ticket **ticket)
398 if (*auth_context == NULL) {
399 ret = krb5_auth_con_init(context, auth_context);
404 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
408 ret = krb5_verify_ap_req(context,
417 free_AP_REQ(&ap_req);
421 static krb5_error_code
422 get_key_from_keytab(krb5_context context,
423 krb5_auth_context *auth_context,
425 krb5_const_principal server,
427 krb5_keyblock **out_key)
429 krb5_keytab_entry entry;
432 krb5_keytab real_keytab;
435 krb5_kt_default(context, &real_keytab);
437 real_keytab = keytab;
439 if (ap_req->ticket.enc_part.kvno)
440 kvno = *ap_req->ticket.enc_part.kvno;
444 ret = krb5_kt_get_entry (context,
448 ap_req->ticket.enc_part.etype,
452 ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
453 krb5_kt_free_entry (context, &entry);
456 krb5_kt_close(context, real_keytab);
462 krb5_rd_req(krb5_context context,
463 krb5_auth_context *auth_context,
464 const krb5_data *inbuf,
465 krb5_const_principal server,
467 krb5_flags *ap_req_options,
468 krb5_ticket **ticket)
472 krb5_keyblock *keyblock = NULL;
473 krb5_principal service = NULL;
475 if (*auth_context == NULL) {
476 ret = krb5_auth_con_init(context, auth_context);
481 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
486 principalname2krb5_principal(&service,
488 ap_req.ticket.realm);
492 if(ap_req.ap_options.use_session_key == 0 ||
493 (*auth_context)->keyblock == NULL){
494 ret = get_key_from_keytab(context,
505 ret = krb5_verify_ap_req(context,
515 krb5_free_keyblock(context, keyblock);
518 free_AP_REQ(&ap_req);
520 krb5_free_principal(context, service);