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
36 struct krb5_kafs_data {
37 krb5_context context;
38 krb5_ccache id;
39 krb5_const_realm realm;
40 };
41
42 enum {
43 KAFS_RXKAD_2B_KVNO = 213,
44 KAFS_RXKAD_K5_KVNO = 256
45 };
46
47 static int
v5_to_kt(krb5_creds * cred,uid_t uid,struct kafs_token * kt,int local524)48 v5_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
94
95 /*
96 * Build a struct ClearToken
97 */
98
99 kt->ct.AuthHandle = kvno;
100 memcpy(kt->ct.HandShakeKey, cred->session.keyvalue.data, 8);
101 kt->ct.ViceId = uid;
102 kt->ct.BeginTimestamp = cred->times.starttime;
103 kt->ct.EndTimestamp = cred->times.endtime;
104
105 _kafs_fixup_viceid(&kt->ct, uid);
106
107 return 0;
108 }
109
110 static krb5_error_code
v5_convert(krb5_context context,krb5_ccache id,krb5_creds * cred,uid_t uid,const char * cell,struct kafs_token * kt)111 v5_convert(krb5_context context, krb5_ccache id,
112 krb5_creds *cred, uid_t uid,
113 const char *cell,
114 struct kafs_token *kt)
115 {
116 krb5_error_code ret;
117 char *c, *val;
118
119 c = strdup(cell);
120 if (c == NULL)
121 return ENOMEM;
122 _kafs_foldup(c, c);
123 krb5_appdefault_string (context, "libkafs",
124 c,
125 "afs-use-524", "2b", &val);
126 free(c);
127
128 if (strcasecmp(val, "local") == 0 ||
129 strcasecmp(val, "2b") == 0)
130 ret = v5_to_kt(cred, uid, kt, 1);
131 else
132 ret = v5_to_kt(cred, uid, kt, 0);
133
134 free(val);
135 return ret;
136 }
137
138
139 /*
140 *
141 */
142
143 static int
get_cred(struct kafs_data * data,const char * name,const char * inst,const char * realm,uid_t uid,struct kafs_token * kt)144 get_cred(struct kafs_data *data, const char *name, const char *inst,
145 const char *realm, uid_t uid, struct kafs_token *kt)
146 {
147 krb5_error_code ret;
148 krb5_creds in_creds, *out_creds;
149 struct krb5_kafs_data *d = data->data;
150 int invalid;
151
152 memset(&in_creds, 0, sizeof(in_creds));
153
154 ret = krb5_make_principal(d->context, &in_creds.server,
155 realm, name, inst, NULL);
156 if(ret)
157 return ret;
158 ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client);
159 if(ret){
160 krb5_free_principal(d->context, in_creds.server);
161 return ret;
162 }
163
164 in_creds.session.keytype = ETYPE_DES_CBC_CRC;
165
166 /* check if des is disable, and in that case enable it for afs */
167 invalid = krb5_enctype_valid(d->context, in_creds.session.keytype);
168 if (invalid)
169 krb5_enctype_enable(d->context, in_creds.session.keytype);
170
171 ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds);
172 if (ret) {
173 in_creds.session.keytype = ETYPE_DES_CBC_MD5;
174 ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds);
175 }
176
177 if (invalid)
178 krb5_enctype_disable(d->context, in_creds.session.keytype);
179
180 krb5_free_principal(d->context, in_creds.server);
181 krb5_free_principal(d->context, in_creds.client);
182 if(ret)
183 return ret;
184
185 ret = v5_convert(d->context, d->id, out_creds, uid,
186 (inst != NULL && inst[0] != '\0') ? inst : realm, kt);
187 krb5_free_creds(d->context, out_creds);
188
189 return ret;
190 }
191
192 static const char *
get_error(struct kafs_data * data,int error)193 get_error(struct kafs_data *data, int error)
194 {
195 struct krb5_kafs_data *d = data->data;
196 return krb5_get_error_message(d->context, error);
197 }
198
199 static void
free_error(struct kafs_data * data,const char * str)200 free_error(struct kafs_data *data, const char *str)
201 {
202 struct krb5_kafs_data *d = data->data;
203 krb5_free_error_message(d->context, str);
204 }
205
206 static krb5_error_code
afslog_uid_int(struct kafs_data * data,const char * cell,const char * rh,uid_t uid,const char * homedir)207 afslog_uid_int(struct kafs_data *data, const char *cell, const char *rh,
208 uid_t uid, const char *homedir)
209 {
210 krb5_error_code ret;
211 struct kafs_token kt;
212 krb5_principal princ;
213 const char *trealm; /* ticket realm */
214 struct krb5_kafs_data *d = data->data;
215
216 if (cell == 0 || cell[0] == 0)
217 return _kafs_afslog_all_local_cells (data, uid, homedir);
218
219 ret = krb5_cc_get_principal (d->context, d->id, &princ);
220 if (ret)
221 return ret;
222
223 trealm = krb5_principal_get_realm (d->context, princ);
224
225 kt.ticket = NULL;
226 ret = _kafs_get_cred(data, cell, d->realm, trealm, uid, &kt);
227 krb5_free_principal (d->context, princ);
228
229 if(ret == 0) {
230 ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len);
231 free(kt.ticket);
232 }
233 return ret;
234 }
235
236 static char *
get_realm(struct kafs_data * data,const char * host)237 get_realm(struct kafs_data *data, const char *host)
238 {
239 struct krb5_kafs_data *d = data->data;
240 krb5_realm *realms;
241 char *r;
242 if(krb5_get_host_realm(d->context, host, &realms))
243 return NULL;
244 r = strdup(realms[0]);
245 krb5_free_host_realm(d->context, realms);
246 return r;
247 }
248
249 krb5_error_code
krb5_afslog_uid_home(krb5_context context,krb5_ccache id,const char * cell,krb5_const_realm realm,uid_t uid,const char * homedir)250 krb5_afslog_uid_home(krb5_context context,
251 krb5_ccache id,
252 const char *cell,
253 krb5_const_realm realm,
254 uid_t uid,
255 const char *homedir)
256 {
257 struct kafs_data kd;
258 struct krb5_kafs_data d;
259 krb5_error_code ret;
260
261 kd.name = "krb5";
262 kd.afslog_uid = afslog_uid_int;
263 kd.get_cred = get_cred;
264 kd.get_realm = get_realm;
265 kd.get_error = get_error;
266 kd.free_error = free_error;
267 kd.data = &d;
268 if (context == NULL) {
269 ret = krb5_init_context(&d.context);
270 if (ret)
271 return ret;
272 } else
273 d.context = context;
274 if (id == NULL) {
275 ret = krb5_cc_default(d.context, &d.id);
276 if (ret)
277 goto out;
278 } else
279 d.id = id;
280 d.realm = realm;
281 ret = afslog_uid_int(&kd, cell, 0, uid, homedir);
282 if (id == NULL)
283 krb5_cc_close(context, d.id);
284 out:
285 if (context == NULL)
286 krb5_free_context(d.context);
287 return ret;
288 }
289
290 krb5_error_code
krb5_afslog_uid(krb5_context context,krb5_ccache id,const char * cell,krb5_const_realm realm,uid_t uid)291 krb5_afslog_uid(krb5_context context,
292 krb5_ccache id,
293 const char *cell,
294 krb5_const_realm realm,
295 uid_t uid)
296 {
297 return krb5_afslog_uid_home (context, id, cell, realm, uid, NULL);
298 }
299
300 krb5_error_code
krb5_afslog(krb5_context context,krb5_ccache id,const char * cell,krb5_const_realm realm)301 krb5_afslog(krb5_context context,
302 krb5_ccache id,
303 const char *cell,
304 krb5_const_realm realm)
305 {
306 return krb5_afslog_uid (context, id, cell, realm, getuid());
307 }
308
309 krb5_error_code
krb5_afslog_home(krb5_context context,krb5_ccache id,const char * cell,krb5_const_realm realm,const char * homedir)310 krb5_afslog_home(krb5_context context,
311 krb5_ccache id,
312 const char *cell,
313 krb5_const_realm realm,
314 const char *homedir)
315 {
316 return krb5_afslog_uid_home (context, id, cell, realm, getuid(), homedir);
317 }
318
319 /*
320 *
321 */
322
323 krb5_error_code
krb5_realm_of_cell(const char * cell,char ** realm)324 krb5_realm_of_cell(const char *cell, char **realm)
325 {
326 struct kafs_data kd;
327
328 kd.name = "krb5";
329 kd.get_realm = get_realm;
330 kd.get_error = get_error;
331 kd.free_error = free_error;
332 return _kafs_realm_of_cell(&kd, cell, realm);
333 }
334
335 /*
336 *
337 */
338
339 int
kafs_settoken5(krb5_context context,const char * cell,uid_t uid,krb5_creds * cred)340 kafs_settoken5(krb5_context context, const char *cell, uid_t uid,
341 krb5_creds *cred)
342 {
343 struct kafs_token kt;
344 int ret;
345
346 ret = v5_convert(context, NULL, cred, uid, cell, &kt);
347 if (ret)
348 return ret;
349
350 ret = kafs_settoken_rxkad(cell, &kt.ct, kt.ticket, kt.ticket_len);
351
352 free(kt.ticket);
353
354 return ret;
355 }
356