1/*
2 * Copyright (c) 1995-2003 Kungliga Tekniska H�gskolan
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
36RCSID("$Id: afskrb5.c 17032 2006-04-10 08:45:04Z lha $");
37
38struct krb5_kafs_data {
39    krb5_context context;
40    krb5_ccache id;
41    krb5_const_realm realm;
42};
43
44enum {
45    KAFS_RXKAD_2B_KVNO = 213,
46    KAFS_RXKAD_K5_KVNO = 256
47};
48
49static int
50v5_to_kt(krb5_creds *cred, uid_t uid, struct kafs_token *kt, int local524)
51{
52    int kvno, ret;
53
54    kt->ticket = NULL;
55
56    /* check if des key */
57    if (cred->session.keyvalue.length != 8)
58	return EINVAL;
59
60    if (local524) {
61	Ticket t;
62	unsigned char *buf;
63	size_t buf_len;
64	size_t len;
65
66	kvno = KAFS_RXKAD_2B_KVNO;
67
68	ret = decode_Ticket(cred->ticket.data, cred->ticket.length, &t, &len);
69	if (ret)
70	    return ret;
71	if (t.tkt_vno != 5)
72	    return -1;
73
74	ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_len, &t.enc_part,
75			   &len, ret);
76	free_Ticket(&t);
77	if (ret)
78	    return ret;
79	if(buf_len != len) {
80	    free(buf);
81	    return KRB5KRB_ERR_GENERIC;
82	}
83
84	kt->ticket = buf;
85	kt->ticket_len = buf_len;
86
87    } else {
88	kvno = KAFS_RXKAD_K5_KVNO;
89	kt->ticket = malloc(cred->ticket.length);
90	if (kt->ticket == NULL)
91	    return ENOMEM;
92	kt->ticket_len = cred->ticket.length;
93	memcpy(kt->ticket, cred->ticket.data, kt->ticket_len);
94
95	ret = 0;
96    }
97
98
99    /*
100     * Build a struct ClearToken
101     */
102
103    kt->ct.AuthHandle = kvno;
104    memcpy(kt->ct.HandShakeKey, cred->session.keyvalue.data, 8);
105    kt->ct.ViceId = uid;
106    kt->ct.BeginTimestamp = cred->times.starttime;
107    kt->ct.EndTimestamp = cred->times.endtime;
108
109    _kafs_fixup_viceid(&kt->ct, uid);
110
111    return 0;
112}
113
114static krb5_error_code
115v5_convert(krb5_context context, krb5_ccache id,
116	   krb5_creds *cred, uid_t uid,
117	   const char *cell,
118	   struct kafs_token *kt)
119{
120    krb5_error_code ret;
121    char *c, *val;
122
123    c = strdup(cell);
124    if (c == NULL)
125	return ENOMEM;
126    _kafs_foldup(c, c);
127    krb5_appdefault_string (context, "libkafs",
128			    c,
129			    "afs-use-524", "2b", &val);
130    free(c);
131
132    if (strcasecmp(val, "local") == 0 ||
133	strcasecmp(val, "2b") == 0)
134	ret = v5_to_kt(cred, uid, kt, 1);
135    else if(strcasecmp(val, "yes") == 0 ||
136	    strcasecmp(val, "true") == 0 ||
137	    atoi(val)) {
138	struct credentials cred4;
139
140	if (id == NULL)
141	    ret = krb524_convert_creds_kdc(context, cred, &cred4);
142	else
143	    ret = krb524_convert_creds_kdc_ccache(context, id, cred, &cred4);
144	if (ret)
145	    goto out;
146
147	ret = _kafs_v4_to_kt(&cred4, uid, kt);
148    } else
149	ret = v5_to_kt(cred, uid, kt, 0);
150
151 out:
152    free(val);
153    return ret;
154}
155
156
157/*
158 *
159 */
160
161static int
162get_cred(struct kafs_data *data, const char *name, const char *inst,
163	 const char *realm, uid_t uid, struct kafs_token *kt)
164{
165    krb5_error_code ret;
166    krb5_creds in_creds, *out_creds;
167    struct krb5_kafs_data *d = data->data;
168
169    memset(&in_creds, 0, sizeof(in_creds));
170    ret = krb5_425_conv_principal(d->context, name, inst, realm,
171				  &in_creds.server);
172    if(ret)
173	return ret;
174    ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client);
175    if(ret){
176	krb5_free_principal(d->context, in_creds.server);
177	return ret;
178    }
179    in_creds.session.keytype = ETYPE_DES_CBC_CRC;
180    ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds);
181    krb5_free_principal(d->context, in_creds.server);
182    krb5_free_principal(d->context, in_creds.client);
183    if(ret)
184	return ret;
185
186    ret = v5_convert(d->context, d->id, out_creds, uid,
187		     (inst != NULL && inst[0] != '\0') ? inst : realm, kt);
188    krb5_free_creds(d->context, out_creds);
189
190    return ret;
191}
192
193static krb5_error_code
194afslog_uid_int(struct kafs_data *data, const char *cell, const char *rh,
195	       uid_t uid, const char *homedir)
196{
197    krb5_error_code ret;
198    struct kafs_token kt;
199    krb5_principal princ;
200    const char *trealm; /* ticket realm */
201    struct krb5_kafs_data *d = data->data;
202
203    if (cell == 0 || cell[0] == 0)
204	return _kafs_afslog_all_local_cells (data, uid, homedir);
205
206    ret = krb5_cc_get_principal (d->context, d->id, &princ);
207    if (ret)
208	return ret;
209
210    trealm = krb5_principal_get_realm (d->context, princ);
211
212    kt.ticket = NULL;
213    ret = _kafs_get_cred(data, cell, d->realm, trealm, uid, &kt);
214    krb5_free_principal (d->context, princ);
215
216    if(ret == 0) {
217	ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len);
218	free(kt.ticket);
219    }
220    return ret;
221}
222
223static char *
224get_realm(struct kafs_data *data, const char *host)
225{
226    struct krb5_kafs_data *d = data->data;
227    krb5_realm *realms;
228    char *r;
229    if(krb5_get_host_realm(d->context, host, &realms))
230	return NULL;
231    r = strdup(realms[0]);
232    krb5_free_host_realm(d->context, realms);
233    return r;
234}
235
236krb5_error_code
237krb5_afslog_uid_home(krb5_context context,
238		     krb5_ccache id,
239		     const char *cell,
240		     krb5_const_realm realm,
241		     uid_t uid,
242		     const char *homedir)
243{
244    struct kafs_data kd;
245    struct krb5_kafs_data d;
246    krb5_error_code ret;
247
248    kd.name = "krb5";
249    kd.afslog_uid = afslog_uid_int;
250    kd.get_cred = get_cred;
251    kd.get_realm = get_realm;
252    kd.data = &d;
253    if (context == NULL) {
254	ret = krb5_init_context(&d.context);
255	if (ret)
256	    return ret;
257    } else
258	d.context = context;
259    if (id == NULL) {
260	ret = krb5_cc_default(d.context, &d.id);
261	if (ret)
262	    goto out;
263    } else
264	d.id = id;
265    d.realm = realm;
266    ret = afslog_uid_int(&kd, cell, 0, uid, homedir);
267    if (id == NULL)
268	krb5_cc_close(context, d.id);
269 out:
270    if (context == NULL)
271	krb5_free_context(d.context);
272    return ret;
273}
274
275krb5_error_code
276krb5_afslog_uid(krb5_context context,
277		krb5_ccache id,
278		const char *cell,
279		krb5_const_realm realm,
280		uid_t uid)
281{
282    return krb5_afslog_uid_home (context, id, cell, realm, uid, NULL);
283}
284
285krb5_error_code
286krb5_afslog(krb5_context context,
287	    krb5_ccache id,
288	    const char *cell,
289	    krb5_const_realm realm)
290{
291    return krb5_afslog_uid (context, id, cell, realm, getuid());
292}
293
294krb5_error_code
295krb5_afslog_home(krb5_context context,
296		 krb5_ccache id,
297		 const char *cell,
298		 krb5_const_realm realm,
299		 const char *homedir)
300{
301    return krb5_afslog_uid_home (context, id, cell, realm, getuid(), homedir);
302}
303
304/*
305 *
306 */
307
308krb5_error_code
309krb5_realm_of_cell(const char *cell, char **realm)
310{
311    struct kafs_data kd;
312
313    kd.name = "krb5";
314    kd.get_realm = get_realm;
315    return _kafs_realm_of_cell(&kd, cell, realm);
316}
317
318/*
319 *
320 */
321
322int
323kafs_settoken5(krb5_context context, const char *cell, uid_t uid,
324	       krb5_creds *cred)
325{
326    struct kafs_token kt;
327    int ret;
328
329    ret = v5_convert(context, NULL, cred, uid, cell, &kt);
330    if (ret)
331	return ret;
332
333    ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len);
334
335    free(kt.ticket);
336
337    return ret;
338}
339