1/*	$NetBSD: get_in_tkt.c,v 1.3 2019/12/15 22:50:50 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997 - 2008 Kungliga Tekniska H��gskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#define KRB5_DEPRECATED_FUNCTION(x)
37
38#include "krb5_locl.h"
39
40#ifndef HEIMDAL_SMALLER
41
42static krb5_error_code
43make_pa_enc_timestamp(krb5_context context, PA_DATA *pa,
44		      krb5_enctype etype, krb5_keyblock *key)
45{
46    PA_ENC_TS_ENC p;
47    unsigned char *buf;
48    size_t buf_size;
49    size_t len = 0;
50    EncryptedData encdata;
51    krb5_error_code ret;
52    int32_t usec;
53    int usec2;
54    krb5_crypto crypto;
55
56    krb5_us_timeofday (context, &p.patimestamp, &usec);
57    usec2         = usec;
58    p.pausec      = &usec2;
59
60    ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
61    if (ret)
62	return ret;
63    if(buf_size != len)
64	krb5_abortx(context, "internal error in ASN.1 encoder");
65    ret = krb5_crypto_init(context, key, 0, &crypto);
66    if (ret) {
67	free(buf);
68	return ret;
69    }
70    ret = krb5_encrypt_EncryptedData(context,
71				     crypto,
72				     KRB5_KU_PA_ENC_TIMESTAMP,
73				     buf,
74				     len,
75				     0,
76				     &encdata);
77    free(buf);
78    krb5_crypto_destroy(context, crypto);
79    if (ret)
80	return ret;
81
82    ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
83    free_EncryptedData(&encdata);
84    if (ret)
85	return ret;
86    if(buf_size != len)
87	krb5_abortx(context, "internal error in ASN.1 encoder");
88    pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
89    pa->padata_value.length = len;
90    pa->padata_value.data = buf;
91    return 0;
92}
93
94static krb5_error_code
95add_padata(krb5_context context,
96	   METHOD_DATA *md,
97	   krb5_principal client,
98	   krb5_key_proc key_proc,
99	   krb5_const_pointer keyseed,
100	   krb5_enctype *enctypes,
101	   unsigned netypes,
102	   krb5_salt *salt)
103{
104    krb5_error_code ret;
105    PA_DATA *pa2;
106    krb5_salt salt2;
107    krb5_enctype *ep;
108    size_t i;
109
110    if(salt == NULL) {
111	/* default to standard salt */
112	ret = krb5_get_pw_salt (context, client, &salt2);
113	if (ret)
114	    return ret;
115	salt = &salt2;
116    }
117    if (!enctypes) {
118	enctypes = context->etypes;
119	netypes = 0;
120	for (ep = enctypes; *ep != (krb5_enctype)ETYPE_NULL; ep++)
121	    netypes++;
122    }
123    pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
124    if (pa2 == NULL)
125	return krb5_enomem(context);
126    md->val = pa2;
127
128    for (i = 0; i < netypes; ++i) {
129	krb5_keyblock *key;
130
131	ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
132	if (ret)
133	    continue;
134	ret = make_pa_enc_timestamp (context, &md->val[md->len],
135				     enctypes[i], key);
136	krb5_free_keyblock (context, key);
137	if (ret)
138	    return ret;
139	++md->len;
140    }
141    if(salt == &salt2)
142	krb5_free_salt(context, salt2);
143    return 0;
144}
145
146static krb5_error_code
147init_as_req (krb5_context context,
148	     KDCOptions opts,
149	     krb5_creds *creds,
150	     const krb5_addresses *addrs,
151	     const krb5_enctype *etypes,
152	     const krb5_preauthtype *ptypes,
153	     const krb5_preauthdata *preauth,
154	     krb5_key_proc key_proc,
155	     krb5_const_pointer keyseed,
156	     unsigned nonce,
157	     AS_REQ *a)
158{
159    krb5_error_code ret;
160    krb5_salt salt;
161
162    memset(a, 0, sizeof(*a));
163
164    a->pvno = 5;
165    a->msg_type = krb_as_req;
166    a->req_body.kdc_options = opts;
167    a->req_body.cname = malloc(sizeof(*a->req_body.cname));
168    if (a->req_body.cname == NULL) {
169	ret = krb5_enomem(context);
170	goto fail;
171    }
172    a->req_body.sname = malloc(sizeof(*a->req_body.sname));
173    if (a->req_body.sname == NULL) {
174	ret = krb5_enomem(context);
175	goto fail;
176    }
177    ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
178    if (ret)
179	goto fail;
180    ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
181    if (ret)
182	goto fail;
183    ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
184    if (ret)
185	goto fail;
186
187    if(creds->times.starttime) {
188	a->req_body.from = malloc(sizeof(*a->req_body.from));
189	if (a->req_body.from == NULL) {
190	    ret = krb5_enomem(context);
191	    goto fail;
192	}
193	*a->req_body.from = creds->times.starttime;
194    }
195    if(creds->times.endtime){
196	ALLOC(a->req_body.till, 1);
197	*a->req_body.till = creds->times.endtime;
198    }
199    if(creds->times.renew_till){
200	a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
201	if (a->req_body.rtime == NULL) {
202	    ret = krb5_enomem(context);
203	    goto fail;
204	}
205	*a->req_body.rtime = creds->times.renew_till;
206    }
207    a->req_body.nonce = nonce;
208    ret = _krb5_init_etype(context,
209			   KRB5_PDU_AS_REQUEST,
210			   &a->req_body.etype.len,
211			   &a->req_body.etype.val,
212			   etypes);
213    if (ret)
214	goto fail;
215
216    /*
217     * This means no addresses
218     */
219
220    if (addrs && addrs->len == 0) {
221	a->req_body.addresses = NULL;
222    } else {
223	a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
224	if (a->req_body.addresses == NULL) {
225	    ret = krb5_enomem(context);
226	    goto fail;
227	}
228
229	if (addrs)
230	    ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
231	else {
232	    ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
233	    if(ret == 0 && a->req_body.addresses->len == 0) {
234		free(a->req_body.addresses);
235		a->req_body.addresses = NULL;
236	    }
237	}
238	if (ret)
239	    return ret;
240    }
241
242    a->req_body.enc_authorization_data = NULL;
243    a->req_body.additional_tickets = NULL;
244
245    if(preauth != NULL) {
246	size_t i;
247	ALLOC(a->padata, 1);
248	if(a->padata == NULL) {
249	    ret = krb5_enomem(context);
250	    goto fail;
251	}
252	a->padata->val = NULL;
253	a->padata->len = 0;
254	for(i = 0; i < preauth->len; i++) {
255	    if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
256		size_t j;
257
258		for(j = 0; j < preauth->val[i].info.len; j++) {
259		    krb5_salt *sp = &salt;
260		    if(preauth->val[i].info.val[j].salttype)
261			salt.salttype = *preauth->val[i].info.val[j].salttype;
262		    else
263			salt.salttype = KRB5_PW_SALT;
264		    if(preauth->val[i].info.val[j].salt)
265			salt.saltvalue = *preauth->val[i].info.val[j].salt;
266		    else
267			if(salt.salttype == KRB5_PW_SALT)
268			    sp = NULL;
269			else
270			    krb5_data_zero(&salt.saltvalue);
271		    ret = add_padata(context, a->padata, creds->client,
272				     key_proc, keyseed,
273				     &preauth->val[i].info.val[j].etype, 1,
274				     sp);
275		    if (ret == 0)
276			break;
277		}
278	    }
279	}
280    } else
281    /* not sure this is the way to use `ptypes' */
282    if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
283	a->padata = NULL;
284    else if (*ptypes ==  KRB5_PADATA_ENC_TIMESTAMP) {
285	ALLOC(a->padata, 1);
286	if (a->padata == NULL) {
287	    ret = krb5_enomem(context);
288	    goto fail;
289	}
290	a->padata->len = 0;
291	a->padata->val = NULL;
292
293	/* make a v5 salted pa-data */
294	add_padata(context, a->padata, creds->client,
295		   key_proc, keyseed, a->req_body.etype.val,
296		   a->req_body.etype.len, NULL);
297
298	/* make a v4 salted pa-data */
299	salt.salttype = KRB5_PW_SALT;
300	krb5_data_zero(&salt.saltvalue);
301	add_padata(context, a->padata, creds->client,
302		   key_proc, keyseed, a->req_body.etype.val,
303		   a->req_body.etype.len, &salt);
304    } else {
305	ret = KRB5_PREAUTH_BAD_TYPE;
306	krb5_set_error_message (context, ret,
307				N_("pre-auth type %d not supported", ""),
308			       *ptypes);
309	goto fail;
310    }
311    return 0;
312fail:
313    free_AS_REQ(a);
314    return ret;
315}
316
317static int
318set_ptypes(krb5_context context,
319	   KRB_ERROR *error,
320	   const krb5_preauthtype **ptypes,
321	   krb5_preauthdata **preauth)
322{
323    static krb5_preauthdata preauth2;
324    static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
325
326    if(error->e_data) {
327	METHOD_DATA md;
328	size_t i;
329	decode_METHOD_DATA(error->e_data->data,
330			   error->e_data->length,
331			   &md,
332			   NULL);
333	for(i = 0; i < md.len; i++){
334	    switch(md.val[i].padata_type){
335	    case KRB5_PADATA_ENC_TIMESTAMP:
336		*ptypes = ptypes2;
337		break;
338	    case KRB5_PADATA_ETYPE_INFO:
339		*preauth = &preauth2;
340		ALLOC_SEQ(*preauth, 1);
341		(*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
342		decode_ETYPE_INFO(md.val[i].padata_value.data,
343				  md.val[i].padata_value.length,
344				  &(*preauth)->val[0].info,
345				  NULL);
346		break;
347	    default:
348		break;
349	    }
350	}
351	free_METHOD_DATA(&md);
352    } else {
353	*ptypes = ptypes2;
354    }
355    return(1);
356}
357
358KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
359krb5_get_in_cred(krb5_context context,
360		 krb5_flags options,
361		 const krb5_addresses *addrs,
362		 const krb5_enctype *etypes,
363		 const krb5_preauthtype *ptypes,
364		 const krb5_preauthdata *preauth,
365		 krb5_key_proc key_proc,
366		 krb5_const_pointer keyseed,
367		 krb5_decrypt_proc decrypt_proc,
368		 krb5_const_pointer decryptarg,
369		 krb5_creds *creds,
370		 krb5_kdc_rep *ret_as_reply)
371    KRB5_DEPRECATED_FUNCTION("Use X instead")
372{
373    krb5_error_code ret;
374    AS_REQ a;
375    krb5_kdc_rep rep;
376    krb5_data req, resp;
377    size_t len = 0;
378    krb5_salt salt;
379    krb5_keyblock *key;
380    size_t size;
381    KDCOptions opts;
382    PA_DATA *pa;
383    krb5_enctype etype;
384    krb5_preauthdata *my_preauth = NULL;
385    unsigned nonce;
386    int done;
387
388    opts = int2KDCOptions(options);
389
390    krb5_generate_random_block (&nonce, sizeof(nonce));
391    nonce &= 0xffffffff;
392
393    do {
394	done = 1;
395	ret = init_as_req (context,
396			   opts,
397			   creds,
398			   addrs,
399			   etypes,
400			   ptypes,
401			   preauth,
402			   key_proc,
403			   keyseed,
404			   nonce,
405			   &a);
406	if (my_preauth) {
407	    free_ETYPE_INFO(&my_preauth->val[0].info);
408	    free (my_preauth->val);
409	    my_preauth = NULL;
410	}
411	if (ret)
412	    return ret;
413
414	ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
415	free_AS_REQ(&a);
416	if (ret)
417	    return ret;
418	if(len != req.length)
419	    krb5_abortx(context, "internal error in ASN.1 encoder");
420
421	ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
422	krb5_data_free(&req);
423	if (ret)
424	    return ret;
425
426	memset (&rep, 0, sizeof(rep));
427	ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
428	if(ret) {
429	    /* let's try to parse it as a KRB-ERROR */
430	    KRB_ERROR error;
431	    int ret2;
432
433	    ret2 = krb5_rd_error(context, &resp, &error);
434	    if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
435		ret = KRB5KRB_AP_ERR_V4_REPLY;
436	    krb5_data_free(&resp);
437	    if (ret2 == 0) {
438		ret = krb5_error_from_rd_error(context, &error, creds);
439		/* if no preauth was set and KDC requires it, give it
440                   one more try */
441		if (!ptypes && !preauth
442		    && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
443#if 0
444			|| ret == KRB5KDC_ERR_BADOPTION
445#endif
446		    && set_ptypes(context, &error, &ptypes, &my_preauth)) {
447		    done = 0;
448		    preauth = my_preauth;
449		    krb5_free_error_contents(context, &error);
450		    krb5_clear_error_message(context);
451		    continue;
452		}
453		if(ret_as_reply)
454		    ret_as_reply->error = error;
455		else
456		    free_KRB_ERROR (&error);
457		return ret;
458	    }
459	    return ret;
460	}
461	krb5_data_free(&resp);
462    } while(!done);
463
464    pa = NULL;
465    etype = rep.kdc_rep.enc_part.etype;
466    if(rep.kdc_rep.padata){
467	int i = 0;
468	pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
469			      KRB5_PADATA_PW_SALT, &i);
470	if(pa == NULL) {
471	    i = 0;
472	    pa = krb5_find_padata(rep.kdc_rep.padata->val,
473				  rep.kdc_rep.padata->len,
474				  KRB5_PADATA_AFS3_SALT, &i);
475	}
476    }
477    if(pa) {
478	salt.salttype = (krb5_salttype)pa->padata_type;
479	salt.saltvalue = pa->padata_value;
480
481	ret = (*key_proc)(context, etype, salt, keyseed, &key);
482    } else {
483	/* make a v5 salted pa-data */
484	ret = krb5_get_pw_salt (context, creds->client, &salt);
485
486	if (ret)
487	    goto out;
488	ret = (*key_proc)(context, etype, salt, keyseed, &key);
489	krb5_free_salt(context, salt);
490    }
491    if (ret)
492	goto out;
493
494    {
495	unsigned flags = EXTRACT_TICKET_TIMESYNC;
496	if (opts.request_anonymous)
497	    flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH | EXTRACT_TICKET_MATCH_ANON;
498
499	ret = _krb5_extract_ticket(context,
500				   &rep,
501				   creds,
502				   key,
503				   keyseed,
504				   KRB5_KU_AS_REP_ENC_PART,
505				   NULL,
506				   nonce,
507				   flags,
508				   NULL,
509				   decrypt_proc,
510				   decryptarg);
511    }
512    memset (key->keyvalue.data, 0, key->keyvalue.length);
513    krb5_free_keyblock_contents (context, key);
514    free (key);
515
516out:
517    if (ret == 0 && ret_as_reply)
518	*ret_as_reply = rep;
519    else
520	krb5_free_kdc_rep (context, &rep);
521    return ret;
522}
523
524KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
525krb5_get_in_tkt(krb5_context context,
526		krb5_flags options,
527		const krb5_addresses *addrs,
528		const krb5_enctype *etypes,
529		const krb5_preauthtype *ptypes,
530		krb5_key_proc key_proc,
531		krb5_const_pointer keyseed,
532		krb5_decrypt_proc decrypt_proc,
533		krb5_const_pointer decryptarg,
534		krb5_creds *creds,
535		krb5_ccache ccache,
536		krb5_kdc_rep *ret_as_reply)
537    KRB5_DEPRECATED_FUNCTION("Use X instead")
538{
539    krb5_error_code ret;
540
541    ret = krb5_get_in_cred (context,
542			    options,
543			    addrs,
544			    etypes,
545			    ptypes,
546			    NULL,
547			    key_proc,
548			    keyseed,
549			    decrypt_proc,
550			    decryptarg,
551			    creds,
552			    ret_as_reply);
553    if(ret)
554	return ret;
555    if (ccache)
556	ret = krb5_cc_store_cred (context, ccache, creds);
557    return ret;
558}
559
560#endif /* HEIMDAL_SMALLER */
561