2 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "krb5_locl.h"
36 RCSID("$Id: get_in_tkt.c 20226 2007-02-16 03:31:50Z lha $");
38 krb5_error_code KRB5_LIB_FUNCTION
39 krb5_init_etype (krb5_context context,
42 const krb5_enctype *etypes)
46 krb5_enctype *tmp = NULL;
50 ret = krb5_get_default_in_tkt_etypes(context,
57 for (i = 0; etypes[i]; ++i)
60 *val = malloc(i * sizeof(**val));
61 if (i != 0 && *val == NULL) {
63 krb5_set_error_string(context, "malloc: out of memory");
76 static krb5_error_code
77 decrypt_tkt (krb5_context context,
80 krb5_const_pointer decrypt_arg,
81 krb5_kdc_rep *dec_rep)
88 ret = krb5_crypto_init(context, key, 0, &crypto);
92 ret = krb5_decrypt_EncryptedData (context,
95 &dec_rep->kdc_rep.enc_part,
97 krb5_crypto_destroy(context, crypto);
102 ret = krb5_decode_EncASRepPart(context,
108 ret = krb5_decode_EncTGSRepPart(context,
113 krb5_data_free (&data);
120 _krb5_extract_ticket(krb5_context context,
124 krb5_const_pointer keyseed,
125 krb5_key_usage key_usage,
126 krb5_addresses *addrs,
129 krb5_decrypt_proc decrypt_proc,
130 krb5_const_pointer decryptarg)
133 krb5_principal tmp_principal;
137 krb5_timestamp sec_now;
139 ret = _krb5_principalname2krb5_principal (context,
142 rep->kdc_rep.crealm);
148 if((flags & EXTRACT_TICKET_ALLOW_CNAME_MISMATCH) == 0){
149 tmp = krb5_principal_compare (context, tmp_principal, creds->client);
151 krb5_free_principal (context, tmp_principal);
152 krb5_clear_error_string (context);
153 ret = KRB5KRB_AP_ERR_MODIFIED;
158 krb5_free_principal (context, creds->client);
159 creds->client = tmp_principal;
162 ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
163 &rep->kdc_rep.ticket, &len, ret);
166 if (creds->ticket.length != len)
167 krb5_abortx(context, "internal error in ASN.1 encoder");
168 creds->second_ticket.length = 0;
169 creds->second_ticket.data = NULL;
173 ret = _krb5_principalname2krb5_principal (context,
175 rep->kdc_rep.ticket.sname,
176 rep->kdc_rep.ticket.realm);
179 if(flags & EXTRACT_TICKET_ALLOW_SERVER_MISMATCH){
180 krb5_free_principal(context, creds->server);
181 creds->server = tmp_principal;
182 tmp_principal = NULL;
184 tmp = krb5_principal_compare (context, tmp_principal,
186 krb5_free_principal (context, tmp_principal);
188 ret = KRB5KRB_AP_ERR_MODIFIED;
189 krb5_clear_error_string (context);
196 if (decrypt_proc == NULL)
197 decrypt_proc = decrypt_tkt;
199 ret = (*decrypt_proc)(context, key, key_usage, decryptarg, rep);
204 if(flags & EXTRACT_TICKET_MATCH_REALM){
205 const char *srealm = krb5_principal_get_realm(context, creds->server);
206 const char *crealm = krb5_principal_get_realm(context, creds->client);
208 if (strcmp(rep->enc_part.srealm, srealm) != 0 ||
209 strcmp(rep->enc_part.srealm, crealm) != 0)
211 ret = KRB5KRB_AP_ERR_MODIFIED;
212 krb5_clear_error_string(context);
219 if (nonce != rep->enc_part.nonce) {
220 ret = KRB5KRB_AP_ERR_MODIFIED;
221 krb5_set_error_string(context, "malloc: out of memory");
227 krb5_timeofday (context, &sec_now);
228 if (rep->enc_part.flags.initial
229 && context->kdc_sec_offset == 0
230 && krb5_config_get_bool (context, NULL,
234 context->kdc_sec_offset = rep->enc_part.authtime - sec_now;
235 krb5_timeofday (context, &sec_now);
238 /* check all times */
240 if (rep->enc_part.starttime) {
241 tmp_time = *rep->enc_part.starttime;
243 tmp_time = rep->enc_part.authtime;
245 if (creds->times.starttime == 0
246 && abs(tmp_time - sec_now) > context->max_skew) {
247 ret = KRB5KRB_AP_ERR_SKEW;
248 krb5_set_error_string (context,
249 "time skew (%d) larger than max (%d)",
250 abs(tmp_time - sec_now),
251 (int)context->max_skew);
255 if (creds->times.starttime != 0
256 && tmp_time != creds->times.starttime) {
257 krb5_clear_error_string (context);
258 ret = KRB5KRB_AP_ERR_MODIFIED;
262 creds->times.starttime = tmp_time;
264 if (rep->enc_part.renew_till) {
265 tmp_time = *rep->enc_part.renew_till;
269 if (creds->times.renew_till != 0
270 && tmp_time > creds->times.renew_till) {
271 krb5_clear_error_string (context);
272 ret = KRB5KRB_AP_ERR_MODIFIED;
276 creds->times.renew_till = tmp_time;
278 creds->times.authtime = rep->enc_part.authtime;
280 if (creds->times.endtime != 0
281 && rep->enc_part.endtime > creds->times.endtime) {
282 krb5_clear_error_string (context);
283 ret = KRB5KRB_AP_ERR_MODIFIED;
287 creds->times.endtime = rep->enc_part.endtime;
289 if(rep->enc_part.caddr)
290 krb5_copy_addresses (context, rep->enc_part.caddr, &creds->addresses);
292 krb5_copy_addresses (context, addrs, &creds->addresses);
294 creds->addresses.len = 0;
295 creds->addresses.val = NULL;
297 creds->flags.b = rep->enc_part.flags;
299 creds->authdata.len = 0;
300 creds->authdata.val = NULL;
301 creds->session.keyvalue.length = 0;
302 creds->session.keyvalue.data = NULL;
303 creds->session.keytype = rep->enc_part.key.keytype;
304 ret = krb5_data_copy (&creds->session.keyvalue,
305 rep->enc_part.key.keyvalue.data,
306 rep->enc_part.key.keyvalue.length);
309 memset (rep->enc_part.key.keyvalue.data, 0,
310 rep->enc_part.key.keyvalue.length);
315 static krb5_error_code
316 make_pa_enc_timestamp(krb5_context context, PA_DATA *pa,
317 krb5_enctype etype, krb5_keyblock *key)
323 EncryptedData encdata;
329 krb5_us_timeofday (context, &p.patimestamp, &usec);
333 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
337 krb5_abortx(context, "internal error in ASN.1 encoder");
338 ret = krb5_crypto_init(context, key, 0, &crypto);
343 ret = krb5_encrypt_EncryptedData(context,
345 KRB5_KU_PA_ENC_TIMESTAMP,
351 krb5_crypto_destroy(context, crypto);
355 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
356 free_EncryptedData(&encdata);
360 krb5_abortx(context, "internal error in ASN.1 encoder");
361 pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
362 pa->padata_value.length = len;
363 pa->padata_value.data = buf;
367 static krb5_error_code
368 add_padata(krb5_context context,
370 krb5_principal client,
371 krb5_key_proc key_proc,
372 krb5_const_pointer keyseed,
373 krb5_enctype *enctypes,
384 /* default to standard salt */
385 ret = krb5_get_pw_salt (context, client, &salt2);
389 enctypes = context->etypes;
391 for (ep = enctypes; *ep != ETYPE_NULL; ep++)
394 pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
396 krb5_set_error_string(context, "malloc: out of memory");
401 for (i = 0; i < netypes; ++i) {
404 ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
407 ret = make_pa_enc_timestamp (context, &md->val[md->len],
409 krb5_free_keyblock (context, key);
415 krb5_free_salt(context, salt2);
419 static krb5_error_code
420 init_as_req (krb5_context context,
423 const krb5_addresses *addrs,
424 const krb5_enctype *etypes,
425 const krb5_preauthtype *ptypes,
426 const krb5_preauthdata *preauth,
427 krb5_key_proc key_proc,
428 krb5_const_pointer keyseed,
435 memset(a, 0, sizeof(*a));
438 a->msg_type = krb_as_req;
439 a->req_body.kdc_options = opts;
440 a->req_body.cname = malloc(sizeof(*a->req_body.cname));
441 if (a->req_body.cname == NULL) {
443 krb5_set_error_string(context, "malloc: out of memory");
446 a->req_body.sname = malloc(sizeof(*a->req_body.sname));
447 if (a->req_body.sname == NULL) {
449 krb5_set_error_string(context, "malloc: out of memory");
452 ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
455 ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
458 ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
462 if(creds->times.starttime) {
463 a->req_body.from = malloc(sizeof(*a->req_body.from));
464 if (a->req_body.from == NULL) {
466 krb5_set_error_string(context, "malloc: out of memory");
469 *a->req_body.from = creds->times.starttime;
471 if(creds->times.endtime){
472 ALLOC(a->req_body.till, 1);
473 *a->req_body.till = creds->times.endtime;
475 if(creds->times.renew_till){
476 a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
477 if (a->req_body.rtime == NULL) {
479 krb5_set_error_string(context, "malloc: out of memory");
482 *a->req_body.rtime = creds->times.renew_till;
484 a->req_body.nonce = nonce;
485 ret = krb5_init_etype (context,
486 &a->req_body.etype.len,
487 &a->req_body.etype.val,
493 * This means no addresses
496 if (addrs && addrs->len == 0) {
497 a->req_body.addresses = NULL;
499 a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
500 if (a->req_body.addresses == NULL) {
502 krb5_set_error_string(context, "malloc: out of memory");
507 ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
509 ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
510 if(ret == 0 && a->req_body.addresses->len == 0) {
511 free(a->req_body.addresses);
512 a->req_body.addresses = NULL;
519 a->req_body.enc_authorization_data = NULL;
520 a->req_body.additional_tickets = NULL;
522 if(preauth != NULL) {
525 if(a->padata == NULL) {
527 krb5_set_error_string(context, "malloc: out of memory");
530 a->padata->val = NULL;
532 for(i = 0; i < preauth->len; i++) {
533 if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
536 for(j = 0; j < preauth->val[i].info.len; j++) {
537 krb5_salt *sp = &salt;
538 if(preauth->val[i].info.val[j].salttype)
539 salt.salttype = *preauth->val[i].info.val[j].salttype;
541 salt.salttype = KRB5_PW_SALT;
542 if(preauth->val[i].info.val[j].salt)
543 salt.saltvalue = *preauth->val[i].info.val[j].salt;
545 if(salt.salttype == KRB5_PW_SALT)
548 krb5_data_zero(&salt.saltvalue);
549 ret = add_padata(context, a->padata, creds->client,
551 &preauth->val[i].info.val[j].etype, 1,
559 /* not sure this is the way to use `ptypes' */
560 if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
562 else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) {
564 if (a->padata == NULL) {
566 krb5_set_error_string(context, "malloc: out of memory");
570 a->padata->val = NULL;
572 /* make a v5 salted pa-data */
573 add_padata(context, a->padata, creds->client,
574 key_proc, keyseed, a->req_body.etype.val,
575 a->req_body.etype.len, NULL);
577 /* make a v4 salted pa-data */
578 salt.salttype = KRB5_PW_SALT;
579 krb5_data_zero(&salt.saltvalue);
580 add_padata(context, a->padata, creds->client,
581 key_proc, keyseed, a->req_body.etype.val,
582 a->req_body.etype.len, &salt);
584 krb5_set_error_string (context, "pre-auth type %d not supported",
586 ret = KRB5_PREAUTH_BAD_TYPE;
596 set_ptypes(krb5_context context,
598 const krb5_preauthtype **ptypes,
599 krb5_preauthdata **preauth)
601 static krb5_preauthdata preauth2;
602 static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
607 decode_METHOD_DATA(error->e_data->data,
608 error->e_data->length,
611 for(i = 0; i < md.len; i++){
612 switch(md.val[i].padata_type){
613 case KRB5_PADATA_ENC_TIMESTAMP:
616 case KRB5_PADATA_ETYPE_INFO:
617 *preauth = &preauth2;
618 ALLOC_SEQ(*preauth, 1);
619 (*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
620 krb5_decode_ETYPE_INFO(context,
621 md.val[i].padata_value.data,
622 md.val[i].padata_value.length,
623 &(*preauth)->val[0].info,
630 free_METHOD_DATA(&md);
637 krb5_error_code KRB5_LIB_FUNCTION
638 krb5_get_in_cred(krb5_context context,
640 const krb5_addresses *addrs,
641 const krb5_enctype *etypes,
642 const krb5_preauthtype *ptypes,
643 const krb5_preauthdata *preauth,
644 krb5_key_proc key_proc,
645 krb5_const_pointer keyseed,
646 krb5_decrypt_proc decrypt_proc,
647 krb5_const_pointer decryptarg,
649 krb5_kdc_rep *ret_as_reply)
662 krb5_preauthdata *my_preauth = NULL;
666 opts = int2KDCOptions(options);
668 krb5_generate_random_block (&nonce, sizeof(nonce));
673 ret = init_as_req (context,
685 free_ETYPE_INFO(&my_preauth->val[0].info);
686 free (my_preauth->val);
692 ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
696 if(len != req.length)
697 krb5_abortx(context, "internal error in ASN.1 encoder");
699 ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
700 krb5_data_free(&req);
704 memset (&rep, 0, sizeof(rep));
705 ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
707 /* let's try to parse it as a KRB-ERROR */
711 ret2 = krb5_rd_error(context, &resp, &error);
712 if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
713 ret = KRB5KRB_AP_ERR_V4_REPLY;
714 krb5_data_free(&resp);
716 ret = krb5_error_from_rd_error(context, &error, creds);
717 /* if no preauth was set and KDC requires it, give it
719 if (!ptypes && !preauth
720 && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
722 || ret == KRB5KDC_ERR_BADOPTION
724 && set_ptypes(context, &error, &ptypes, &my_preauth)) {
726 preauth = my_preauth;
727 krb5_free_error_contents(context, &error);
728 krb5_clear_error_string(context);
732 ret_as_reply->error = error;
734 free_KRB_ERROR (&error);
739 krb5_data_free(&resp);
743 etype = rep.kdc_rep.enc_part.etype;
744 if(rep.kdc_rep.padata){
746 pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
747 KRB5_PADATA_PW_SALT, &i);
750 pa = krb5_find_padata(rep.kdc_rep.padata->val,
751 rep.kdc_rep.padata->len,
752 KRB5_PADATA_AFS3_SALT, &i);
756 salt.salttype = pa->padata_type;
757 salt.saltvalue = pa->padata_value;
759 ret = (*key_proc)(context, etype, salt, keyseed, &key);
761 /* make a v5 salted pa-data */
762 ret = krb5_get_pw_salt (context, creds->client, &salt);
766 ret = (*key_proc)(context, etype, salt, keyseed, &key);
767 krb5_free_salt(context, salt);
774 if (opts.request_anonymous)
775 flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
777 ret = _krb5_extract_ticket(context,
782 KRB5_KU_AS_REP_ENC_PART,
789 memset (key->keyvalue.data, 0, key->keyvalue.length);
790 krb5_free_keyblock_contents (context, key);
794 if (ret == 0 && ret_as_reply)
797 krb5_free_kdc_rep (context, &rep);
801 krb5_error_code KRB5_LIB_FUNCTION
802 krb5_get_in_tkt(krb5_context context,
804 const krb5_addresses *addrs,
805 const krb5_enctype *etypes,
806 const krb5_preauthtype *ptypes,
807 krb5_key_proc key_proc,
808 krb5_const_pointer keyseed,
809 krb5_decrypt_proc decrypt_proc,
810 krb5_const_pointer decryptarg,
813 krb5_kdc_rep *ret_as_reply)
817 ret = krb5_get_in_cred (context,
832 ret = krb5_cc_store_cred (context, ccache, creds);