1/* $NetBSD: afskrb5.c,v 1.2 2017/01/28 21:31:49 christos Exp $ */
2
3/*
4 * Copyright (c) 1995-2003 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#include "kafs_locl.h"
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 if (local524) {
57 Ticket t;
58 unsigned char *buf;
59 size_t buf_len;
60 size_t len;
61
62 kvno = KAFS_RXKAD_2B_KVNO;
63
64 ret = decode_Ticket(cred->ticket.data, cred->ticket.length, &t, &len);
65 if (ret)
66 return ret;
67 if (t.tkt_vno != 5)
68 return -1;
69
70 ASN1_MALLOC_ENCODE(EncryptedData, buf, buf_len, &t.enc_part,
71 &len, ret);
72 free_Ticket(&t);
73 if (ret)
74 return ret;
75 if(buf_len != len) {
76 free(buf);
77 return KRB5KRB_ERR_GENERIC;
78 }
79
80 kt->ticket = buf;
81 kt->ticket_len = buf_len;
82
83 } else {
84 kvno = KAFS_RXKAD_K5_KVNO;
85 kt->ticket = malloc(cred->ticket.length);
86 if (kt->ticket == NULL)
87 return ENOMEM;
88 kt->ticket_len = cred->ticket.length;
89 memcpy(kt->ticket, cred->ticket.data, kt->ticket_len);
90
91 ret = 0;
92 }
93
94
95 /*
96 * Build a struct ClearToken
97 */
98
99 ret = _kafs_derive_des_key(cred->session.keytype,
100 cred->session.keyvalue.data,
101 cred->session.keyvalue.length,
102 kt->ct.HandShakeKey);
103 if (ret) {
104 free(kt->ticket);
105 kt->ticket = NULL;
106 return ret;
107 }
108 kt->ct.AuthHandle = kvno;
109 kt->ct.ViceId = uid;
110 kt->ct.BeginTimestamp = cred->times.starttime;
111 kt->ct.EndTimestamp = cred->times.endtime;
112
113 _kafs_fixup_viceid(&kt->ct, uid);
114
115 return 0;
116}
117
118static krb5_error_code
119v5_convert(krb5_context context, krb5_ccache id,
120 krb5_creds *cred, uid_t uid,
121 const char *cell,
122 struct kafs_token *kt)
123{
124 krb5_error_code ret;
125 char *c, *val;
126
127 c = strdup(cell);
128 if (c == NULL)
129 return ENOMEM;
130 _kafs_foldup(c, c);
131 krb5_appdefault_string (context, "libkafs",
132 c,
133 "afs-use-524", "2b", &val);
134 free(c);
135
136 if (strcasecmp(val, "local") == 0 ||
137 strcasecmp(val, "2b") == 0)
138 ret = v5_to_kt(cred, uid, kt, 1);
139 else
140 ret = v5_to_kt(cred, uid, kt, 0);
141
142 free(val);
143 return ret;
144}
145
146
147/*
148 *
149 */
150
151static int
152get_cred(struct kafs_data *data, const char *name, const char *inst,
153 const char *realm, uid_t uid, struct kafs_token *kt)
154{
155 krb5_error_code ret;
156 krb5_creds in_creds, *out_creds;
157 struct krb5_kafs_data *d = data->data;
158 int invalid;
159
160 memset(&in_creds, 0, sizeof(in_creds));
161
162 ret = krb5_make_principal(d->context, &in_creds.server,
163 realm, name, inst, NULL);
164 if(ret)
165 return ret;
166 ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client);
167 if(ret){
168 krb5_free_principal(d->context, in_creds.server);
169 return ret;
170 }
171
172 /* check if des is disable, and in that case enable it for afs */
173 invalid = krb5_enctype_valid(d->context, ETYPE_DES_CBC_CRC);
174 if (invalid)
175 krb5_enctype_enable(d->context, ETYPE_DES_CBC_CRC);
176
177 ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds);
178
179 if (invalid)
180 krb5_enctype_disable(d->context, ETYPE_DES_CBC_CRC);
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