1 /* $NetBSD: afskrb5.c,v 1.3 2023/06/19 21:41:44 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
38 struct krb5_kafs_data {
39 krb5_context context;
40 krb5_ccache id;
41 krb5_const_realm realm;
42 };
43
44 enum {
45 KAFS_RXKAD_2B_KVNO = 213,
46 KAFS_RXKAD_K5_KVNO = 256
47 };
48
49 static int
v5_to_kt(krb5_creds * cred,uid_t uid,struct kafs_token * kt,int local524)50 v5_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
92
93 /*
94 * Build a struct ClearToken
95 */
96
97 ret = _kafs_derive_des_key(cred->session.keytype,
98 cred->session.keyvalue.data,
99 cred->session.keyvalue.length,
100 kt->ct.HandShakeKey);
101 if (ret) {
102 free(kt->ticket);
103 kt->ticket = NULL;
104 return ret;
105 }
106 kt->ct.AuthHandle = kvno;
107 kt->ct.ViceId = uid;
108 kt->ct.BeginTimestamp = cred->times.starttime;
109 kt->ct.EndTimestamp = cred->times.endtime;
110
111 _kafs_fixup_viceid(&kt->ct, uid);
112
113 return 0;
114 }
115
116 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)117 v5_convert(krb5_context context, krb5_ccache id,
118 krb5_creds *cred, uid_t uid,
119 const char *cell,
120 struct kafs_token *kt)
121 {
122 krb5_error_code ret;
123 char *c, *val;
124
125 c = strdup(cell);
126 if (c == NULL)
127 return ENOMEM;
128 _kafs_foldup(c, c);
129 krb5_appdefault_string (context, "libkafs",
130 c,
131 "afs-use-524", "2b", &val);
132 free(c);
133
134 if (strcasecmp(val, "local") == 0 ||
135 strcasecmp(val, "2b") == 0)
136 ret = v5_to_kt(cred, uid, kt, 1);
137 else
138 ret = v5_to_kt(cred, uid, kt, 0);
139
140 free(val);
141 return ret;
142 }
143
144
145 /*
146 *
147 */
148
149 static int
get_cred(struct kafs_data * data,const char * name,const char * inst,const char * realm,uid_t uid,struct kafs_token * kt)150 get_cred(struct kafs_data *data, const char *name, const char *inst,
151 const char *realm, uid_t uid, struct kafs_token *kt)
152 {
153 krb5_error_code ret;
154 krb5_creds in_creds, *out_creds;
155 struct krb5_kafs_data *d = data->data;
156 int invalid;
157
158 memset(&in_creds, 0, sizeof(in_creds));
159
160 ret = krb5_make_principal(d->context, &in_creds.server,
161 realm, name, inst, NULL);
162 if(ret)
163 return ret;
164 ret = krb5_cc_get_principal(d->context, d->id, &in_creds.client);
165 if(ret){
166 krb5_free_principal(d->context, in_creds.server);
167 return ret;
168 }
169
170 /* check if des is disable, and in that case enable it for afs */
171 invalid = krb5_enctype_valid(d->context, ETYPE_DES_CBC_CRC);
172 if (invalid)
173 krb5_enctype_enable(d->context, ETYPE_DES_CBC_CRC);
174
175 ret = krb5_get_credentials(d->context, 0, d->id, &in_creds, &out_creds);
176
177 if (invalid)
178 krb5_enctype_disable(d->context, ETYPE_DES_CBC_CRC);
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