1/*	$NetBSD: get_in_tkt.c,v 1.1.1.1 2011/04/13 18:15:34 elric Exp $	*/
2
3/*
4 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
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
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;
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    int 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 != ETYPE_NULL; ep++)
121	    netypes++;
122    }
123    pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
124    if (pa2 == NULL) {
125	krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
126	return ENOMEM;
127    }
128    md->val = pa2;
129
130    for (i = 0; i < netypes; ++i) {
131	krb5_keyblock *key;
132
133	ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
134	if (ret)
135	    continue;
136	ret = make_pa_enc_timestamp (context, &md->val[md->len],
137				     enctypes[i], key);
138	krb5_free_keyblock (context, key);
139	if (ret)
140	    return ret;
141	++md->len;
142    }
143    if(salt == &salt2)
144	krb5_free_salt(context, salt2);
145    return 0;
146}
147
148static krb5_error_code
149init_as_req (krb5_context context,
150	     KDCOptions opts,
151	     krb5_creds *creds,
152	     const krb5_addresses *addrs,
153	     const krb5_enctype *etypes,
154	     const krb5_preauthtype *ptypes,
155	     const krb5_preauthdata *preauth,
156	     krb5_key_proc key_proc,
157	     krb5_const_pointer keyseed,
158	     unsigned nonce,
159	     AS_REQ *a)
160{
161    krb5_error_code ret;
162    krb5_salt salt;
163
164    memset(a, 0, sizeof(*a));
165
166    a->pvno = 5;
167    a->msg_type = krb_as_req;
168    a->req_body.kdc_options = opts;
169    a->req_body.cname = malloc(sizeof(*a->req_body.cname));
170    if (a->req_body.cname == NULL) {
171	ret = ENOMEM;
172	krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
173	goto fail;
174    }
175    a->req_body.sname = malloc(sizeof(*a->req_body.sname));
176    if (a->req_body.sname == NULL) {
177	ret = ENOMEM;
178	krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
179	goto fail;
180    }
181    ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
182    if (ret)
183	goto fail;
184    ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
185    if (ret)
186	goto fail;
187    ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
188    if (ret)
189	goto fail;
190
191    if(creds->times.starttime) {
192	a->req_body.from = malloc(sizeof(*a->req_body.from));
193	if (a->req_body.from == NULL) {
194	    ret = ENOMEM;
195	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
196	    goto fail;
197	}
198	*a->req_body.from = creds->times.starttime;
199    }
200    if(creds->times.endtime){
201	ALLOC(a->req_body.till, 1);
202	*a->req_body.till = creds->times.endtime;
203    }
204    if(creds->times.renew_till){
205	a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
206	if (a->req_body.rtime == NULL) {
207	    ret = ENOMEM;
208	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
209	    goto fail;
210	}
211	*a->req_body.rtime = creds->times.renew_till;
212    }
213    a->req_body.nonce = nonce;
214    ret = krb5_init_etype (context,
215			   &a->req_body.etype.len,
216			   &a->req_body.etype.val,
217			   etypes);
218    if (ret)
219	goto fail;
220
221    /*
222     * This means no addresses
223     */
224
225    if (addrs && addrs->len == 0) {
226	a->req_body.addresses = NULL;
227    } else {
228	a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
229	if (a->req_body.addresses == NULL) {
230	    ret = ENOMEM;
231	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
232	    goto fail;
233	}
234
235	if (addrs)
236	    ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
237	else {
238	    ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
239	    if(ret == 0 && a->req_body.addresses->len == 0) {
240		free(a->req_body.addresses);
241		a->req_body.addresses = NULL;
242	    }
243	}
244	if (ret)
245	    return ret;
246    }
247
248    a->req_body.enc_authorization_data = NULL;
249    a->req_body.additional_tickets = NULL;
250
251    if(preauth != NULL) {
252	int i;
253	ALLOC(a->padata, 1);
254	if(a->padata == NULL) {
255	    ret = ENOMEM;
256	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
257	    goto fail;
258	}
259	a->padata->val = NULL;
260	a->padata->len = 0;
261	for(i = 0; i < preauth->len; i++) {
262	    if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
263		int j;
264
265		for(j = 0; j < preauth->val[i].info.len; j++) {
266		    krb5_salt *sp = &salt;
267		    if(preauth->val[i].info.val[j].salttype)
268			salt.salttype = *preauth->val[i].info.val[j].salttype;
269		    else
270			salt.salttype = KRB5_PW_SALT;
271		    if(preauth->val[i].info.val[j].salt)
272			salt.saltvalue = *preauth->val[i].info.val[j].salt;
273		    else
274			if(salt.salttype == KRB5_PW_SALT)
275			    sp = NULL;
276			else
277			    krb5_data_zero(&salt.saltvalue);
278		    ret = add_padata(context, a->padata, creds->client,
279				     key_proc, keyseed,
280				     &preauth->val[i].info.val[j].etype, 1,
281				     sp);
282		    if (ret == 0)
283			break;
284		}
285	    }
286	}
287    } else
288    /* not sure this is the way to use `ptypes' */
289    if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
290	a->padata = NULL;
291    else if (*ptypes ==  KRB5_PADATA_ENC_TIMESTAMP) {
292	ALLOC(a->padata, 1);
293	if (a->padata == NULL) {
294	    ret = ENOMEM;
295	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
296	    goto fail;
297	}
298	a->padata->len = 0;
299	a->padata->val = NULL;
300
301	/* make a v5 salted pa-data */
302	add_padata(context, a->padata, creds->client,
303		   key_proc, keyseed, a->req_body.etype.val,
304		   a->req_body.etype.len, NULL);
305
306	/* make a v4 salted pa-data */
307	salt.salttype = KRB5_PW_SALT;
308	krb5_data_zero(&salt.saltvalue);
309	add_padata(context, a->padata, creds->client,
310		   key_proc, keyseed, a->req_body.etype.val,
311		   a->req_body.etype.len, &salt);
312    } else {
313	ret = KRB5_PREAUTH_BAD_TYPE;
314	krb5_set_error_message (context, ret,
315				N_("pre-auth type %d not supported", ""),
316			       *ptypes);
317	goto fail;
318    }
319    return 0;
320fail:
321    free_AS_REQ(a);
322    return ret;
323}
324
325static int
326set_ptypes(krb5_context context,
327	   KRB_ERROR *error,
328	   const krb5_preauthtype **ptypes,
329	   krb5_preauthdata **preauth)
330{
331    static krb5_preauthdata preauth2;
332    static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
333
334    if(error->e_data) {
335	METHOD_DATA md;
336	int i;
337	decode_METHOD_DATA(error->e_data->data,
338			   error->e_data->length,
339			   &md,
340			   NULL);
341	for(i = 0; i < md.len; i++){
342	    switch(md.val[i].padata_type){
343	    case KRB5_PADATA_ENC_TIMESTAMP:
344		*ptypes = ptypes2;
345		break;
346	    case KRB5_PADATA_ETYPE_INFO:
347		*preauth = &preauth2;
348		ALLOC_SEQ(*preauth, 1);
349		(*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
350		decode_ETYPE_INFO(md.val[i].padata_value.data,
351				  md.val[i].padata_value.length,
352				  &(*preauth)->val[0].info,
353				  NULL);
354		break;
355	    default:
356		break;
357	    }
358	}
359	free_METHOD_DATA(&md);
360    } else {
361	*ptypes = ptypes2;
362    }
363    return(1);
364}
365
366KRB5_DEPRECATED
367KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
368krb5_get_in_cred(krb5_context context,
369		 krb5_flags options,
370		 const krb5_addresses *addrs,
371		 const krb5_enctype *etypes,
372		 const krb5_preauthtype *ptypes,
373		 const krb5_preauthdata *preauth,
374		 krb5_key_proc key_proc,
375		 krb5_const_pointer keyseed,
376		 krb5_decrypt_proc decrypt_proc,
377		 krb5_const_pointer decryptarg,
378		 krb5_creds *creds,
379		 krb5_kdc_rep *ret_as_reply)
380{
381    krb5_error_code ret;
382    AS_REQ a;
383    krb5_kdc_rep rep;
384    krb5_data req, resp;
385    size_t len;
386    krb5_salt salt;
387    krb5_keyblock *key;
388    size_t size;
389    KDCOptions opts;
390    PA_DATA *pa;
391    krb5_enctype etype;
392    krb5_preauthdata *my_preauth = NULL;
393    unsigned nonce;
394    int done;
395
396    opts = int2KDCOptions(options);
397
398    krb5_generate_random_block (&nonce, sizeof(nonce));
399    nonce &= 0xffffffff;
400
401    do {
402	done = 1;
403	ret = init_as_req (context,
404			   opts,
405			   creds,
406			   addrs,
407			   etypes,
408			   ptypes,
409			   preauth,
410			   key_proc,
411			   keyseed,
412			   nonce,
413			   &a);
414	if (my_preauth) {
415	    free_ETYPE_INFO(&my_preauth->val[0].info);
416	    free (my_preauth->val);
417	    my_preauth = NULL;
418	}
419	if (ret)
420	    return ret;
421
422	ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
423	free_AS_REQ(&a);
424	if (ret)
425	    return ret;
426	if(len != req.length)
427	    krb5_abortx(context, "internal error in ASN.1 encoder");
428
429	ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
430	krb5_data_free(&req);
431	if (ret)
432	    return ret;
433
434	memset (&rep, 0, sizeof(rep));
435	ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
436	if(ret) {
437	    /* let's try to parse it as a KRB-ERROR */
438	    KRB_ERROR error;
439	    int ret2;
440
441	    ret2 = krb5_rd_error(context, &resp, &error);
442	    if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
443		ret = KRB5KRB_AP_ERR_V4_REPLY;
444	    krb5_data_free(&resp);
445	    if (ret2 == 0) {
446		ret = krb5_error_from_rd_error(context, &error, creds);
447		/* if no preauth was set and KDC requires it, give it
448                   one more try */
449		if (!ptypes && !preauth
450		    && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
451#if 0
452			|| ret == KRB5KDC_ERR_BADOPTION
453#endif
454		    && set_ptypes(context, &error, &ptypes, &my_preauth)) {
455		    done = 0;
456		    preauth = my_preauth;
457		    krb5_free_error_contents(context, &error);
458		    krb5_clear_error_message(context);
459		    continue;
460		}
461		if(ret_as_reply)
462		    ret_as_reply->error = error;
463		else
464		    free_KRB_ERROR (&error);
465		return ret;
466	    }
467	    return ret;
468	}
469	krb5_data_free(&resp);
470    } while(!done);
471
472    pa = NULL;
473    etype = rep.kdc_rep.enc_part.etype;
474    if(rep.kdc_rep.padata){
475	int i = 0;
476	pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
477			      KRB5_PADATA_PW_SALT, &i);
478	if(pa == NULL) {
479	    i = 0;
480	    pa = krb5_find_padata(rep.kdc_rep.padata->val,
481				  rep.kdc_rep.padata->len,
482				  KRB5_PADATA_AFS3_SALT, &i);
483	}
484    }
485    if(pa) {
486	salt.salttype = pa->padata_type;
487	salt.saltvalue = pa->padata_value;
488
489	ret = (*key_proc)(context, etype, salt, keyseed, &key);
490    } else {
491	/* make a v5 salted pa-data */
492	ret = krb5_get_pw_salt (context, creds->client, &salt);
493
494	if (ret)
495	    goto out;
496	ret = (*key_proc)(context, etype, salt, keyseed, &key);
497	krb5_free_salt(context, salt);
498    }
499    if (ret)
500	goto out;
501
502    {
503	unsigned flags = EXTRACT_TICKET_TIMESYNC;
504	if (opts.request_anonymous)
505	    flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
506
507	ret = _krb5_extract_ticket(context,
508				   &rep,
509				   creds,
510				   key,
511				   keyseed,
512				   KRB5_KU_AS_REP_ENC_PART,
513				   NULL,
514				   nonce,
515				   flags,
516				   decrypt_proc,
517				   decryptarg);
518    }
519    memset (key->keyvalue.data, 0, key->keyvalue.length);
520    krb5_free_keyblock_contents (context, key);
521    free (key);
522
523out:
524    if (ret == 0 && ret_as_reply)
525	*ret_as_reply = rep;
526    else
527	krb5_free_kdc_rep (context, &rep);
528    return ret;
529}
530
531KRB5_DEPRECATED
532KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
533krb5_get_in_tkt(krb5_context context,
534		krb5_flags options,
535		const krb5_addresses *addrs,
536		const krb5_enctype *etypes,
537		const krb5_preauthtype *ptypes,
538		krb5_key_proc key_proc,
539		krb5_const_pointer keyseed,
540		krb5_decrypt_proc decrypt_proc,
541		krb5_const_pointer decryptarg,
542		krb5_creds *creds,
543		krb5_ccache ccache,
544		krb5_kdc_rep *ret_as_reply)
545{
546    krb5_error_code ret;
547
548    ret = krb5_get_in_cred (context,
549			    options,
550			    addrs,
551			    etypes,
552			    ptypes,
553			    NULL,
554			    key_proc,
555			    keyseed,
556			    decrypt_proc,
557			    decryptarg,
558			    creds,
559			    ret_as_reply);
560    if(ret)
561	return ret;
562    if (ccache)
563	ret = krb5_cc_store_cred (context, ccache, creds);
564    return ret;
565}
566
567#endif /* HEIMDAL_SMALLER */
568