get_in_tkt.c revision 1.1.1.1.22.1 
1/*	$NetBSD: get_in_tkt.c,v 1.1.1.1.22.1 2014/08/10 06:47:30 tls 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 != 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			   KRB5_PDU_AS_REQUEST,
216			   &a->req_body.etype.len,
217			   &a->req_body.etype.val,
218			   etypes);
219    if (ret)
220	goto fail;
221
222    /*
223     * This means no addresses
224     */
225
226    if (addrs && addrs->len == 0) {
227	a->req_body.addresses = NULL;
228    } else {
229	a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
230	if (a->req_body.addresses == NULL) {
231	    ret = ENOMEM;
232	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
233	    goto fail;
234	}
235
236	if (addrs)
237	    ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
238	else {
239	    ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
240	    if(ret == 0 && a->req_body.addresses->len == 0) {
241		free(a->req_body.addresses);
242		a->req_body.addresses = NULL;
243	    }
244	}
245	if (ret)
246	    return ret;
247    }
248
249    a->req_body.enc_authorization_data = NULL;
250    a->req_body.additional_tickets = NULL;
251
252    if(preauth != NULL) {
253	size_t i;
254	ALLOC(a->padata, 1);
255	if(a->padata == NULL) {
256	    ret = ENOMEM;
257	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
258	    goto fail;
259	}
260	a->padata->val = NULL;
261	a->padata->len = 0;
262	for(i = 0; i < preauth->len; i++) {
263	    if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
264		size_t j;
265
266		for(j = 0; j < preauth->val[i].info.len; j++) {
267		    krb5_salt *sp = &salt;
268		    if(preauth->val[i].info.val[j].salttype)
269			salt.salttype = *preauth->val[i].info.val[j].salttype;
270		    else
271			salt.salttype = KRB5_PW_SALT;
272		    if(preauth->val[i].info.val[j].salt)
273			salt.saltvalue = *preauth->val[i].info.val[j].salt;
274		    else
275			if(salt.salttype == KRB5_PW_SALT)
276			    sp = NULL;
277			else
278			    krb5_data_zero(&salt.saltvalue);
279		    ret = add_padata(context, a->padata, creds->client,
280				     key_proc, keyseed,
281				     &preauth->val[i].info.val[j].etype, 1,
282				     sp);
283		    if (ret == 0)
284			break;
285		}
286	    }
287	}
288    } else
289    /* not sure this is the way to use `ptypes' */
290    if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
291	a->padata = NULL;
292    else if (*ptypes ==  KRB5_PADATA_ENC_TIMESTAMP) {
293	ALLOC(a->padata, 1);
294	if (a->padata == NULL) {
295	    ret = ENOMEM;
296	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
297	    goto fail;
298	}
299	a->padata->len = 0;
300	a->padata->val = NULL;
301
302	/* make a v5 salted pa-data */
303	add_padata(context, a->padata, creds->client,
304		   key_proc, keyseed, a->req_body.etype.val,
305		   a->req_body.etype.len, NULL);
306
307	/* make a v4 salted pa-data */
308	salt.salttype = KRB5_PW_SALT;
309	krb5_data_zero(&salt.saltvalue);
310	add_padata(context, a->padata, creds->client,
311		   key_proc, keyseed, a->req_body.etype.val,
312		   a->req_body.etype.len, &salt);
313    } else {
314	ret = KRB5_PREAUTH_BAD_TYPE;
315	krb5_set_error_message (context, ret,
316				N_("pre-auth type %d not supported", ""),
317			       *ptypes);
318	goto fail;
319    }
320    return 0;
321fail:
322    free_AS_REQ(a);
323    return ret;
324}
325
326static int
327set_ptypes(krb5_context context,
328	   KRB_ERROR *error,
329	   const krb5_preauthtype **ptypes,
330	   krb5_preauthdata **preauth)
331{
332    static krb5_preauthdata preauth2;
333    static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
334
335    if(error->e_data) {
336	METHOD_DATA md;
337	size_t i;
338	decode_METHOD_DATA(error->e_data->data,
339			   error->e_data->length,
340			   &md,
341			   NULL);
342	for(i = 0; i < md.len; i++){
343	    switch(md.val[i].padata_type){
344	    case KRB5_PADATA_ENC_TIMESTAMP:
345		*ptypes = ptypes2;
346		break;
347	    case KRB5_PADATA_ETYPE_INFO:
348		*preauth = &preauth2;
349		ALLOC_SEQ(*preauth, 1);
350		(*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
351		decode_ETYPE_INFO(md.val[i].padata_value.data,
352				  md.val[i].padata_value.length,
353				  &(*preauth)->val[0].info,
354				  NULL);
355		break;
356	    default:
357		break;
358	    }
359	}
360	free_METHOD_DATA(&md);
361    } else {
362	*ptypes = ptypes2;
363    }
364    return(1);
365}
366
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    KRB5_DEPRECATED_FUNCTION("Use X instead")
381{
382    krb5_error_code ret;
383    AS_REQ a;
384    krb5_kdc_rep rep;
385    krb5_data req, resp;
386    size_t len = 0;
387    krb5_salt salt;
388    krb5_keyblock *key;
389    size_t size;
390    KDCOptions opts;
391    PA_DATA *pa;
392    krb5_enctype etype;
393    krb5_preauthdata *my_preauth = NULL;
394    unsigned nonce;
395    int done;
396
397    opts = int2KDCOptions(options);
398
399    krb5_generate_random_block (&nonce, sizeof(nonce));
400    nonce &= 0xffffffff;
401
402    do {
403	done = 1;
404	ret = init_as_req (context,
405			   opts,
406			   creds,
407			   addrs,
408			   etypes,
409			   ptypes,
410			   preauth,
411			   key_proc,
412			   keyseed,
413			   nonce,
414			   &a);
415	if (my_preauth) {
416	    free_ETYPE_INFO(&my_preauth->val[0].info);
417	    free (my_preauth->val);
418	    my_preauth = NULL;
419	}
420	if (ret)
421	    return ret;
422
423	ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
424	free_AS_REQ(&a);
425	if (ret)
426	    return ret;
427	if(len != req.length)
428	    krb5_abortx(context, "internal error in ASN.1 encoder");
429
430	ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
431	krb5_data_free(&req);
432	if (ret)
433	    return ret;
434
435	memset (&rep, 0, sizeof(rep));
436	ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
437	if(ret) {
438	    /* let's try to parse it as a KRB-ERROR */
439	    KRB_ERROR error;
440	    int ret2;
441
442	    ret2 = krb5_rd_error(context, &resp, &error);
443	    if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
444		ret = KRB5KRB_AP_ERR_V4_REPLY;
445	    krb5_data_free(&resp);
446	    if (ret2 == 0) {
447		ret = krb5_error_from_rd_error(context, &error, creds);
448		/* if no preauth was set and KDC requires it, give it
449                   one more try */
450		if (!ptypes && !preauth
451		    && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
452#if 0
453			|| ret == KRB5KDC_ERR_BADOPTION
454#endif
455		    && set_ptypes(context, &error, &ptypes, &my_preauth)) {
456		    done = 0;
457		    preauth = my_preauth;
458		    krb5_free_error_contents(context, &error);
459		    krb5_clear_error_message(context);
460		    continue;
461		}
462		if(ret_as_reply)
463		    ret_as_reply->error = error;
464		else
465		    free_KRB_ERROR (&error);
466		return ret;
467	    }
468	    return ret;
469	}
470	krb5_data_free(&resp);
471    } while(!done);
472
473    pa = NULL;
474    etype = rep.kdc_rep.enc_part.etype;
475    if(rep.kdc_rep.padata){
476	int i = 0;
477	pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
478			      KRB5_PADATA_PW_SALT, &i);
479	if(pa == NULL) {
480	    i = 0;
481	    pa = krb5_find_padata(rep.kdc_rep.padata->val,
482				  rep.kdc_rep.padata->len,
483				  KRB5_PADATA_AFS3_SALT, &i);
484	}
485    }
486    if(pa) {
487	salt.salttype = (krb5_salttype)pa->padata_type;
488	salt.saltvalue = pa->padata_value;
489
490	ret = (*key_proc)(context, etype, salt, keyseed, &key);
491    } else {
492	/* make a v5 salted pa-data */
493	ret = krb5_get_pw_salt (context, creds->client, &salt);
494
495	if (ret)
496	    goto out;
497	ret = (*key_proc)(context, etype, salt, keyseed, &key);
498	krb5_free_salt(context, salt);
499    }
500    if (ret)
501	goto out;
502
503    {
504	unsigned flags = EXTRACT_TICKET_TIMESYNC;
505	if (opts.request_anonymous)
506	    flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
507
508	ret = _krb5_extract_ticket(context,
509				   &rep,
510				   creds,
511				   key,
512				   keyseed,
513				   KRB5_KU_AS_REP_ENC_PART,
514				   NULL,
515				   nonce,
516				   flags,
517				   decrypt_proc,
518				   decryptarg);
519    }
520    memset (key->keyvalue.data, 0, key->keyvalue.length);
521    krb5_free_keyblock_contents (context, key);
522    free (key);
523
524out:
525    if (ret == 0 && ret_as_reply)
526	*ret_as_reply = rep;
527    else
528	krb5_free_kdc_rep (context, &rep);
529    return ret;
530}
531
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    KRB5_DEPRECATED_FUNCTION("Use X instead")
546{
547    krb5_error_code ret;
548
549    ret = krb5_get_in_cred (context,
550			    options,
551			    addrs,
552			    etypes,
553			    ptypes,
554			    NULL,
555			    key_proc,
556			    keyseed,
557			    decrypt_proc,
558			    decryptarg,
559			    creds,
560			    ret_as_reply);
561    if(ret)
562	return ret;
563    if (ccache)
564	ret = krb5_cc_store_cred (context, ccache, creds);
565    return ret;
566}
567
568#endif /* HEIMDAL_SMALLER */
569