1/*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
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.
16 *
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.
20 *
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
31 * SUCH DAMAGE.
32 */
33
34#include "krb5_locl.h"
35
36#ifndef HEIMDAL_SMALLER
37
38static krb5_error_code
39make_pa_enc_timestamp(krb5_context context, PA_DATA *pa,
40		      krb5_enctype etype, krb5_keyblock *key)
41{
42    PA_ENC_TS_ENC p;
43    unsigned char *buf;
44    size_t buf_size;
45    size_t len = 0;
46    EncryptedData encdata;
47    krb5_error_code ret;
48    int32_t usec;
49    int usec2;
50    krb5_crypto crypto;
51
52    krb5_us_timeofday (context, &p.patimestamp, &usec);
53    usec2         = usec;
54    p.pausec      = &usec2;
55
56    ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC, buf, buf_size, &p, &len, ret);
57    if (ret)
58	return ret;
59    if(buf_size != len)
60	krb5_abortx(context, "internal error in ASN.1 encoder");
61    ret = krb5_crypto_init(context, key, 0, &crypto);
62    if (ret) {
63	free(buf);
64	return ret;
65    }
66    ret = krb5_encrypt_EncryptedData(context,
67				     crypto,
68				     KRB5_KU_PA_ENC_TIMESTAMP,
69				     buf,
70				     len,
71				     0,
72				     &encdata);
73    free(buf);
74    krb5_crypto_destroy(context, crypto);
75    if (ret)
76	return ret;
77
78    ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_size, &encdata, &len, ret);
79    free_EncryptedData(&encdata);
80    if (ret)
81	return ret;
82    if(buf_size != len)
83	krb5_abortx(context, "internal error in ASN.1 encoder");
84    pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
85    pa->padata_value.length = len;
86    pa->padata_value.data = buf;
87    return 0;
88}
89
90static krb5_error_code
91add_padata(krb5_context context,
92	   METHOD_DATA *md,
93	   krb5_principal client,
94	   krb5_key_proc key_proc,
95	   krb5_const_pointer keyseed,
96	   krb5_enctype *enctypes,
97	   unsigned netypes,
98	   krb5_salt *salt)
99{
100    krb5_error_code ret;
101    PA_DATA *pa2;
102    krb5_salt salt2;
103    krb5_enctype *ep;
104    size_t i;
105
106    if(salt == NULL) {
107	/* default to standard salt */
108	ret = krb5_get_pw_salt (context, client, &salt2);
109	if (ret)
110	    return ret;
111	salt = &salt2;
112    }
113    if (!enctypes) {
114	enctypes = context->etypes;
115	netypes = 0;
116	for (ep = enctypes; *ep != ETYPE_NULL; ep++)
117	    netypes++;
118    }
119    pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
120    if (pa2 == NULL) {
121	krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
122	return ENOMEM;
123    }
124    md->val = pa2;
125
126    for (i = 0; i < netypes; ++i) {
127	krb5_keyblock *key;
128
129	ret = (*key_proc)(context, enctypes[i], *salt, keyseed, &key);
130	if (ret)
131	    continue;
132	ret = make_pa_enc_timestamp (context, &md->val[md->len],
133				     enctypes[i], key);
134	krb5_free_keyblock (context, key);
135	if (ret)
136	    return ret;
137	++md->len;
138    }
139    if(salt == &salt2)
140	krb5_free_salt(context, salt2);
141    return 0;
142}
143
144static krb5_error_code
145init_as_req (krb5_context context,
146	     KDCOptions opts,
147	     krb5_creds *creds,
148	     const krb5_addresses *addrs,
149	     const krb5_enctype *etypes,
150	     const krb5_preauthtype *ptypes,
151	     const krb5_preauthdata *preauth,
152	     krb5_key_proc key_proc,
153	     krb5_const_pointer keyseed,
154	     unsigned nonce,
155	     AS_REQ *a)
156{
157    krb5_error_code ret;
158    krb5_salt salt;
159
160    memset(a, 0, sizeof(*a));
161
162    a->pvno = 5;
163    a->msg_type = krb_as_req;
164    a->req_body.kdc_options = opts;
165    a->req_body.cname = malloc(sizeof(*a->req_body.cname));
166    if (a->req_body.cname == NULL) {
167	ret = ENOMEM;
168	krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
169	goto fail;
170    }
171    a->req_body.sname = malloc(sizeof(*a->req_body.sname));
172    if (a->req_body.sname == NULL) {
173	ret = ENOMEM;
174	krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
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 = ENOMEM;
191	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
192	    goto fail;
193	}
194	*a->req_body.from = creds->times.starttime;
195    }
196    if(creds->times.endtime){
197	ALLOC(a->req_body.till, 1);
198	*a->req_body.till = creds->times.endtime;
199    }
200    if(creds->times.renew_till){
201	a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
202	if (a->req_body.rtime == NULL) {
203	    ret = ENOMEM;
204	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
205	    goto fail;
206	}
207	*a->req_body.rtime = creds->times.renew_till;
208    }
209    a->req_body.nonce = nonce;
210    ret = _krb5_init_etype(context,
211			   KRB5_PDU_AS_REQUEST,
212			   &a->req_body.etype.len,
213			   &a->req_body.etype.val,
214			   etypes);
215    if (ret)
216	goto fail;
217
218    /*
219     * This means no addresses
220     */
221
222    if (addrs && addrs->len == 0) {
223	a->req_body.addresses = NULL;
224    } else {
225	a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
226	if (a->req_body.addresses == NULL) {
227	    ret = ENOMEM;
228	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
229	    goto fail;
230	}
231
232	if (addrs)
233	    ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
234	else {
235	    ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
236	    if(ret == 0 && a->req_body.addresses->len == 0) {
237		free(a->req_body.addresses);
238		a->req_body.addresses = NULL;
239	    }
240	}
241	if (ret)
242	    return ret;
243    }
244
245    a->req_body.enc_authorization_data = NULL;
246    a->req_body.additional_tickets = NULL;
247
248    if(preauth != NULL) {
249	size_t i;
250	ALLOC(a->padata, 1);
251	if(a->padata == NULL) {
252	    ret = ENOMEM;
253	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
254	    goto fail;
255	}
256	a->padata->val = NULL;
257	a->padata->len = 0;
258	for(i = 0; i < preauth->len; i++) {
259	    if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
260		size_t j;
261
262		for(j = 0; j < preauth->val[i].info.len; j++) {
263		    krb5_salt *sp = &salt;
264		    if(preauth->val[i].info.val[j].salttype)
265			salt.salttype = *preauth->val[i].info.val[j].salttype;
266		    else
267			salt.salttype = KRB5_PW_SALT;
268		    if(preauth->val[i].info.val[j].salt)
269			salt.saltvalue = *preauth->val[i].info.val[j].salt;
270		    else
271			if(salt.salttype == KRB5_PW_SALT)
272			    sp = NULL;
273			else
274			    krb5_data_zero(&salt.saltvalue);
275		    ret = add_padata(context, a->padata, creds->client,
276				     key_proc, keyseed,
277				     &preauth->val[i].info.val[j].etype, 1,
278				     sp);
279		    if (ret == 0)
280			break;
281		}
282	    }
283	}
284    } else
285    /* not sure this is the way to use `ptypes' */
286    if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
287	a->padata = NULL;
288    else if (*ptypes ==  KRB5_PADATA_ENC_TIMESTAMP) {
289	ALLOC(a->padata, 1);
290	if (a->padata == NULL) {
291	    ret = ENOMEM;
292	    krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
293	    goto fail;
294	}
295	a->padata->len = 0;
296	a->padata->val = NULL;
297
298	/* make a v5 salted pa-data */
299	add_padata(context, a->padata, creds->client,
300		   key_proc, keyseed, a->req_body.etype.val,
301		   a->req_body.etype.len, NULL);
302
303	/* make a v4 salted pa-data */
304	salt.salttype = KRB5_PW_SALT;
305	krb5_data_zero(&salt.saltvalue);
306	add_padata(context, a->padata, creds->client,
307		   key_proc, keyseed, a->req_body.etype.val,
308		   a->req_body.etype.len, &salt);
309    } else {
310	ret = KRB5_PREAUTH_BAD_TYPE;
311	krb5_set_error_message (context, ret,
312				N_("pre-auth type %d not supported", ""),
313			       *ptypes);
314	goto fail;
315    }
316    return 0;
317fail:
318    free_AS_REQ(a);
319    return ret;
320}
321
322static int
323set_ptypes(krb5_context context,
324	   KRB_ERROR *error,
325	   const krb5_preauthtype **ptypes,
326	   krb5_preauthdata **preauth)
327{
328    static krb5_preauthdata preauth2;
329    static krb5_preauthtype ptypes2[] = { KRB5_PADATA_ENC_TIMESTAMP, KRB5_PADATA_NONE };
330
331    if(error->e_data) {
332	METHOD_DATA md;
333	size_t i;
334	decode_METHOD_DATA(error->e_data->data,
335			   error->e_data->length,
336			   &md,
337			   NULL);
338	for(i = 0; i < md.len; i++){
339	    switch(md.val[i].padata_type){
340	    case KRB5_PADATA_ENC_TIMESTAMP:
341		*ptypes = ptypes2;
342		break;
343	    case KRB5_PADATA_ETYPE_INFO:
344		*preauth = &preauth2;
345		ALLOC_SEQ(*preauth, 1);
346		(*preauth)->val[0].type = KRB5_PADATA_ENC_TIMESTAMP;
347		decode_ETYPE_INFO(md.val[i].padata_value.data,
348				  md.val[i].padata_value.length,
349				  &(*preauth)->val[0].info,
350				  NULL);
351		break;
352	    default:
353		break;
354	    }
355	}
356	free_METHOD_DATA(&md);
357    } else {
358	*ptypes = ptypes2;
359    }
360    return(1);
361}
362
363KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
364krb5_get_in_cred(krb5_context context,
365		 krb5_flags options,
366		 const krb5_addresses *addrs,
367		 const krb5_enctype *etypes,
368		 const krb5_preauthtype *ptypes,
369		 const krb5_preauthdata *preauth,
370		 krb5_key_proc key_proc,
371		 krb5_const_pointer keyseed,
372		 krb5_decrypt_proc decrypt_proc,
373		 krb5_const_pointer decryptarg,
374		 krb5_creds *creds,
375		 krb5_kdc_rep *ret_as_reply)
376    KRB5_DEPRECATED_FUNCTION("Use X instead")
377{
378    krb5_error_code ret;
379    AS_REQ a;
380    krb5_kdc_rep rep;
381    krb5_data req, resp;
382    size_t len = 0;
383    krb5_salt salt;
384    krb5_keyblock *key;
385    size_t size;
386    KDCOptions opts;
387    PA_DATA *pa;
388    krb5_enctype etype;
389    krb5_preauthdata *my_preauth = NULL;
390    unsigned nonce;
391    int done;
392
393    opts = int2KDCOptions(options);
394
395    krb5_generate_random_block (&nonce, sizeof(nonce));
396    nonce &= 0xffffffff;
397
398    do {
399	done = 1;
400	ret = init_as_req (context,
401			   opts,
402			   creds,
403			   addrs,
404			   etypes,
405			   ptypes,
406			   preauth,
407			   key_proc,
408			   keyseed,
409			   nonce,
410			   &a);
411	if (my_preauth) {
412	    free_ETYPE_INFO(&my_preauth->val[0].info);
413	    free (my_preauth->val);
414	    my_preauth = NULL;
415	}
416	if (ret)
417	    return ret;
418
419	ASN1_MALLOC_ENCODE(AS_REQ, req.data, req.length, &a, &len, ret);
420	free_AS_REQ(&a);
421	if (ret)
422	    return ret;
423	if(len != req.length)
424	    krb5_abortx(context, "internal error in ASN.1 encoder");
425
426	ret = krb5_sendto_kdc (context, &req, &creds->client->realm, &resp);
427	krb5_data_free(&req);
428	if (ret)
429	    return ret;
430
431	memset (&rep, 0, sizeof(rep));
432	ret = decode_AS_REP(resp.data, resp.length, &rep.kdc_rep, &size);
433	if(ret) {
434	    /* let's try to parse it as a KRB-ERROR */
435	    KRB_ERROR error;
436	    int ret2;
437
438	    ret2 = krb5_rd_error(context, &resp, &error);
439	    if(ret2 && resp.data && ((char*)resp.data)[0] == 4)
440		ret = KRB5KRB_AP_ERR_V4_REPLY;
441	    krb5_data_free(&resp);
442	    if (ret2 == 0) {
443		ret = krb5_error_from_rd_error(context, &error, creds);
444		/* if no preauth was set and KDC requires it, give it
445                   one more try */
446		if (!ptypes && !preauth
447		    && ret == KRB5KDC_ERR_PREAUTH_REQUIRED
448#if 0
449			|| ret == KRB5KDC_ERR_BADOPTION
450#endif
451		    && set_ptypes(context, &error, &ptypes, &my_preauth)) {
452		    done = 0;
453		    preauth = my_preauth;
454		    krb5_free_error_contents(context, &error);
455		    krb5_clear_error_message(context);
456		    continue;
457		}
458		if(ret_as_reply)
459		    ret_as_reply->error = error;
460		else
461		    free_KRB_ERROR (&error);
462		return ret;
463	    }
464	    return ret;
465	}
466	krb5_data_free(&resp);
467    } while(!done);
468
469    pa = NULL;
470    etype = rep.kdc_rep.enc_part.etype;
471    if(rep.kdc_rep.padata){
472	int i = 0;
473	pa = krb5_find_padata(rep.kdc_rep.padata->val, rep.kdc_rep.padata->len,
474			      KRB5_PADATA_PW_SALT, &i);
475	if(pa == NULL) {
476	    i = 0;
477	    pa = krb5_find_padata(rep.kdc_rep.padata->val,
478				  rep.kdc_rep.padata->len,
479				  KRB5_PADATA_AFS3_SALT, &i);
480	}
481    }
482    if(pa) {
483	salt.salttype = (krb5_salttype)pa->padata_type;
484	salt.saltvalue = pa->padata_value;
485
486	ret = (*key_proc)(context, etype, salt, keyseed, &key);
487    } else {
488	/* make a v5 salted pa-data */
489	ret = krb5_get_pw_salt (context, creds->client, &salt);
490
491	if (ret)
492	    goto out;
493	ret = (*key_proc)(context, etype, salt, keyseed, &key);
494	krb5_free_salt(context, salt);
495    }
496    if (ret)
497	goto out;
498
499    {
500	unsigned flags = EXTRACT_TICKET_TIMESYNC;
501	if (opts.request_anonymous)
502	    flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
503
504	ret = _krb5_extract_ticket(context,
505				   &rep,
506				   creds,
507				   key,
508				   keyseed,
509				   KRB5_KU_AS_REP_ENC_PART,
510				   NULL,
511				   nonce,
512				   flags,
513				   decrypt_proc,
514				   decryptarg);
515    }
516    memset (key->keyvalue.data, 0, key->keyvalue.length);
517    krb5_free_keyblock_contents (context, key);
518    free (key);
519
520out:
521    if (ret == 0 && ret_as_reply)
522	*ret_as_reply = rep;
523    else
524	krb5_free_kdc_rep (context, &rep);
525    return ret;
526}
527
528KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
529krb5_get_in_tkt(krb5_context context,
530		krb5_flags options,
531		const krb5_addresses *addrs,
532		const krb5_enctype *etypes,
533		const krb5_preauthtype *ptypes,
534		krb5_key_proc key_proc,
535		krb5_const_pointer keyseed,
536		krb5_decrypt_proc decrypt_proc,
537		krb5_const_pointer decryptarg,
538		krb5_creds *creds,
539		krb5_ccache ccache,
540		krb5_kdc_rep *ret_as_reply)
541    KRB5_DEPRECATED_FUNCTION("Use X instead")
542{
543    krb5_error_code ret;
544
545    ret = krb5_get_in_cred (context,
546			    options,
547			    addrs,
548			    etypes,
549			    ptypes,
550			    NULL,
551			    key_proc,
552			    keyseed,
553			    decrypt_proc,
554			    decryptarg,
555			    creds,
556			    ret_as_reply);
557    if(ret)
558	return ret;
559    if (ccache)
560	ret = krb5_cc_store_cred (context, ccache, creds);
561    return ret;
562}
563
564#endif /* HEIMDAL_SMALLER */
565