1/*
2 * Copyright (c) 1995-2003 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 "kafs_locl.h"
35
36struct krb5_kafs_data {
37    krb5_context context;
38    krb5_ccache id;
39    krb5_const_realm realm;
40};
41
42enum {
43    KAFS_RXKAD_2B_KVNO = 213,
44    KAFS_RXKAD_K5_KVNO = 256
45};
46
47static int
48v5_to_kt(krb5_creds *cred, uid_t uid, struct kafs_token *kt, int local524)
49{
50    int kvno, ret;
51
52    kt->ticket = NULL;
53
54    /* check if des key */
55    if (cred->session.keyvalue.length != 8)
56	return EINVAL;
57
58    if (local524) {
59	Ticket t;
60	unsigned char *buf;
61	size_t buf_len;
62	size_t len;
63
64	kvno = KAFS_RXKAD_2B_KVNO;
65
66	ret = decode_Ticket(cred->ticket.data, cred->ticket.length, &t, &len);
67	if (ret)
68	    return ret;
69	if (t.tkt_vno != 5)
70	    return -1;
71
72	ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_len, &t.enc_part,
73			   &len, ret);
74	free_Ticket(&t);
75	if (ret)
76	    return ret;
77	if(buf_len != len) {
78	    free(buf);
79	    return KRB5KRB_ERR_GENERIC;
80	}
81
82	kt->ticket = buf;
83	kt->ticket_len = buf_len;
84
85    } else {
86	kvno = KAFS_RXKAD_K5_KVNO;
87	kt->ticket = malloc(cred->ticket.length);
88	if (kt->ticket == NULL)
89	    return ENOMEM;
90	kt->ticket_len = cred->ticket.length;
91	memcpy(kt->ticket, cred->ticket.data, kt->ticket_len);
92
93	ret = 0;
94    }
95
96
97    /*
98     * Build a struct ClearToken
99     */
100
101    kt->ct.AuthHandle = kvno;
102    memcpy(kt->ct.HandShakeKey, cred->session.keyvalue.data, 8);
103    kt->ct.ViceId = uid;
104    kt->ct.BeginTimestamp = cred->times.starttime;
105    kt->ct.EndTimestamp = cred->times.endtime;
106
107    _kafs_fixup_viceid(&kt->ct, uid);
108
109    return 0;
110}
111
112static krb5_error_code
113v5_convert(krb5_context context, krb5_ccache id,
114	   krb5_creds *cred, uid_t uid,
115	   const char *cell,
116	   struct kafs_token *kt)
117{
118    krb5_error_code ret;
119    char *c, *val;
120
121    c = strdup(cell);
122    if (c == NULL)
123	return ENOMEM;
124    _kafs_foldup(c, c);
125    krb5_appdefault_string (context, "libkafs",
126			    c,
127			    "afs-use-524", "2b", &val);
128    free(c);
129
130    if (strcasecmp(val, "local") == 0 ||
131	strcasecmp(val, "2b") == 0)
132	ret = v5_to_kt(cred, uid, kt, 1);
133    else
134	ret = v5_to_kt(cred, uid, kt, 0);
135
136    free(val);
137    return ret;
138}
139
140
141/*
142 *
143 */
144
145static int
146get_cred(struct kafs_data *data, const char *name, const char *inst,
147	 const char *realm, uid_t uid, struct kafs_token *kt)
148{
149    krb5_error_code ret;
150    krb5_creds in_creds, *out_creds;
151    struct krb5_kafs_data *d = data->data;
152    int invalid;
153
154    memset(&in_creds, 0, sizeof(in_creds));
155
156    ret = krb5_make_principal(d->context, &in_creds.server,
157			      realm, name, inst, NULL);
158    if(ret)
159	return ret;
160    ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client);
161    if(ret){
162	krb5_free_principal(d->context, in_creds.server);
163	return ret;
164    }
165
166    in_creds.session.keytype = ETYPE_DES_CBC_CRC;
167
168    /* check if des is disable, and in that case enable it for afs */
169    invalid = krb5_enctype_valid(d->context, in_creds.session.keytype);
170    if (invalid)
171	krb5_enctype_enable(d->context, in_creds.session.keytype);
172
173    ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds);
174    if (ret) {
175	in_creds.session.keytype = ETYPE_DES_CBC_MD5;
176	ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds);
177    }
178
179    if (invalid)
180	krb5_enctype_disable(d->context, in_creds.session.keytype);
181
182    krb5_free_principal(d->context, in_creds.server);
183    krb5_free_principal(d->context, in_creds.client);
184    if(ret)
185	return ret;
186
187    ret = v5_convert(d->context, d->id, out_creds, uid,
188		     (inst != NULL && inst[0] != '\0') ? inst : realm, kt);
189    krb5_free_creds(d->context, out_creds);
190
191    return ret;
192}
193
194static const char *
195get_error(struct kafs_data *data, int error)
196{
197    struct krb5_kafs_data *d = data->data;
198    return krb5_get_error_message(d->context, error);
199}
200
201static void
202free_error(struct kafs_data *data, const char *str)
203{
204    struct krb5_kafs_data *d = data->data;
205    krb5_free_error_message(d->context, str);
206}
207
208static krb5_error_code
209afslog_uid_int(struct kafs_data *data, const char *cell, const char *rh,
210	       uid_t uid, const char *homedir)
211{
212    krb5_error_code ret;
213    struct kafs_token kt;
214    krb5_principal princ;
215    const char *trealm; /* ticket realm */
216    struct krb5_kafs_data *d = data->data;
217
218    if (cell == 0 || cell[0] == 0)
219	return _kafs_afslog_all_local_cells (data, uid, homedir);
220
221    ret = krb5_cc_get_principal (d->context, d->id, &princ);
222    if (ret)
223	return ret;
224
225    trealm = krb5_principal_get_realm (d->context, princ);
226
227    kt.ticket = NULL;
228    ret = _kafs_get_cred(data, cell, d->realm, trealm, uid, &kt);
229    krb5_free_principal (d->context, princ);
230
231    if(ret == 0) {
232	ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len);
233	free(kt.ticket);
234    }
235    return ret;
236}
237
238static char *
239get_realm(struct kafs_data *data, const char *host)
240{
241    struct krb5_kafs_data *d = data->data;
242    krb5_realm *realms;
243    char *r;
244    if(krb5_get_host_realm(d->context, host, &realms))
245	return NULL;
246    r = strdup(realms[0]);
247    krb5_free_host_realm(d->context, realms);
248    return r;
249}
250
251krb5_error_code
252krb5_afslog_uid_home(krb5_context context,
253		     krb5_ccache id,
254		     const char *cell,
255		     krb5_const_realm realm,
256		     uid_t uid,
257		     const char *homedir)
258{
259    struct kafs_data kd;
260    struct krb5_kafs_data d;
261    krb5_error_code ret;
262
263    kd.name = "krb5";
264    kd.afslog_uid = afslog_uid_int;
265    kd.get_cred = get_cred;
266    kd.get_realm = get_realm;
267    kd.get_error = get_error;
268    kd.free_error = free_error;
269    kd.data = &d;
270    if (context == NULL) {
271	ret = krb5_init_context(&d.context);
272	if (ret)
273	    return ret;
274    } else
275	d.context = context;
276    if (id == NULL) {
277	ret = krb5_cc_default(d.context, &d.id);
278	if (ret)
279	    goto out;
280    } else
281	d.id = id;
282    d.realm = realm;
283    ret = afslog_uid_int(&kd, cell, 0, uid, homedir);
284    if (id == NULL)
285	krb5_cc_close(context, d.id);
286 out:
287    if (context == NULL)
288	krb5_free_context(d.context);
289    return ret;
290}
291
292krb5_error_code
293krb5_afslog_uid(krb5_context context,
294		krb5_ccache id,
295		const char *cell,
296		krb5_const_realm realm,
297		uid_t uid)
298{
299    return krb5_afslog_uid_home (context, id, cell, realm, uid, NULL);
300}
301
302krb5_error_code
303krb5_afslog(krb5_context context,
304	    krb5_ccache id,
305	    const char *cell,
306	    krb5_const_realm realm)
307{
308    return krb5_afslog_uid (context, id, cell, realm, getuid());
309}
310
311krb5_error_code
312krb5_afslog_home(krb5_context context,
313		 krb5_ccache id,
314		 const char *cell,
315		 krb5_const_realm realm,
316		 const char *homedir)
317{
318    return krb5_afslog_uid_home (context, id, cell, realm, getuid(), homedir);
319}
320
321/*
322 *
323 */
324
325krb5_error_code
326krb5_realm_of_cell(const char *cell, char **realm)
327{
328    struct kafs_data kd;
329
330    kd.name = "krb5";
331    kd.get_realm = get_realm;
332    kd.get_error = get_error;
333    kd.free_error = free_error;
334    return _kafs_realm_of_cell(&kd, cell, realm);
335}
336
337/*
338 *
339 */
340
341int
342kafs_settoken5(krb5_context context, const char *cell, uid_t uid,
343	       krb5_creds *cred)
344{
345    struct kafs_token kt;
346    int ret;
347
348    ret = v5_convert(context, NULL, cred, uid, cell, &kt);
349    if (ret)
350	return ret;
351
352    ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len);
353
354    free(kt.ticket);
355
356    return ret;
357}
358