source: heimdal/trunk/lib/kafs/afskrb5.c@ 3

Last change on this file since 3 was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 8.6 KB
Line 
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}
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