1 /* $NetBSD: get_s.c,v 1.3 2023/06/19 21:41:44 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2006 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 <krb5_locl.h>
37 #include "kadm5_locl.h"
38 #include <assert.h>
39
40 __RCSID("$NetBSD: get_s.c,v 1.3 2023/06/19 21:41:44 christos Exp $");
41
42 static kadm5_ret_t
add_tl_data(kadm5_principal_ent_t ent,int16_t type,const void * data,size_t size)43 add_tl_data(kadm5_principal_ent_t ent, int16_t type,
44 const void *data, size_t size)
45 {
46 krb5_tl_data *tl;
47
48 tl = calloc(1, sizeof(*tl));
49 if (tl == NULL)
50 return _kadm5_error_code(ENOMEM);
51
52 tl->tl_data_type = type;
53 tl->tl_data_length = size;
54 tl->tl_data_contents = malloc(size);
55 if (tl->tl_data_contents == NULL && size != 0) {
56 free(tl);
57 return _kadm5_error_code(ENOMEM);
58 }
59 memcpy(tl->tl_data_contents, data, size);
60
61 tl->tl_data_next = ent->tl_data;
62 ent->tl_data = tl;
63 ent->n_tl_data++;
64
65 return 0;
66 }
67
68 static
69 krb5_error_code
copy_keyset_to_kadm5(kadm5_server_context * context,krb5_kvno kvno,size_t n_keys,Key * keys,krb5_salt * salt,kadm5_principal_ent_t out)70 copy_keyset_to_kadm5(kadm5_server_context *context, krb5_kvno kvno,
71 size_t n_keys, Key *keys, krb5_salt *salt,
72 kadm5_principal_ent_t out)
73 {
74 size_t i;
75 Key *key;
76 krb5_key_data *kd;
77 krb5_data *sp;
78 krb5_error_code ret = 0;
79
80 for (i = 0; i < n_keys; i++) {
81 key = &keys[i];
82 kd = &out->key_data[out->n_key_data];
83 kd->key_data_ver = 2;
84 kd->key_data_kvno = kvno;
85 kd->key_data_type[0] = key->key.keytype;
86 if(key->salt)
87 kd->key_data_type[1] = key->salt->type;
88 else
89 kd->key_data_type[1] = KRB5_PADATA_PW_SALT;
90 /* setup key */
91 kd->key_data_length[0] = key->key.keyvalue.length;
92 kd->key_data_contents[0] = malloc(kd->key_data_length[0]);
93 if(kd->key_data_contents[0] == NULL && kd->key_data_length[0] != 0){
94 ret = ENOMEM;
95 break;
96 }
97 memcpy(kd->key_data_contents[0], key->key.keyvalue.data,
98 kd->key_data_length[0]);
99 /* setup salt */
100 if(key->salt)
101 sp = &key->salt->salt;
102 else
103 sp = &salt->saltvalue;
104 kd->key_data_length[1] = sp->length;
105 kd->key_data_contents[1] = malloc(kd->key_data_length[1]);
106 if(kd->key_data_length[1] != 0
107 && kd->key_data_contents[1] == NULL) {
108 memset(kd->key_data_contents[0], 0, kd->key_data_length[0]);
109 ret = ENOMEM;
110 break;
111 }
112 memcpy(kd->key_data_contents[1], sp->data, kd->key_data_length[1]);
113 out->n_key_data++;
114 }
115
116 return ret;
117 }
118
119 kadm5_ret_t
kadm5_s_get_principal(void * server_handle,krb5_principal princ,kadm5_principal_ent_t out,uint32_t mask)120 kadm5_s_get_principal(void *server_handle,
121 krb5_principal princ,
122 kadm5_principal_ent_t out,
123 uint32_t mask)
124 {
125 kadm5_server_context *context = server_handle;
126 kadm5_ret_t ret;
127 hdb_entry_ex ent;
128
129 memset(&ent, 0, sizeof(ent));
130 memset(out, 0, sizeof(*out));
131
132 if (!context->keep_open) {
133 ret = context->db->hdb_open(context->context, context->db, O_RDONLY, 0);
134 if (ret)
135 return ret;
136 }
137
138 /*
139 * We may want to attempt to recover the log on read operations, but we
140 * because the HDB/log lock order is reversed on slaves, in order to avoid
141 * lock contention from kadm5srv apps we need to make sure that the the HDB
142 * open for read-write is optimistic and attempts only a non-blocking lock,
143 * and if it doesn't get it then it should fallback to read-only. But we
144 * don't have that option in the hdb_open() interface at this time.
145 *
146 * For now we won't attempt to recover the log.
147 */
148
149 ret = context->db->hdb_fetch_kvno(context->context, context->db, princ,
150 HDB_F_DECRYPT|HDB_F_ALL_KVNOS|
151 HDB_F_GET_ANY|HDB_F_ADMIN_DATA, 0, &ent);
152
153 if (!context->keep_open)
154 context->db->hdb_close(context->context, context->db);
155 if(ret)
156 return _kadm5_error_code(ret);
157
158 if(mask & KADM5_PRINCIPAL)
159 ret = krb5_copy_principal(context->context, ent.entry.principal,
160 &out->principal);
161 if(ret)
162 goto out;
163 if(mask & KADM5_PRINC_EXPIRE_TIME && ent.entry.valid_end)
164 out->princ_expire_time = *ent.entry.valid_end;
165 if(mask & KADM5_PW_EXPIRATION && ent.entry.pw_end)
166 out->pw_expiration = *ent.entry.pw_end;
167 if(mask & KADM5_LAST_PWD_CHANGE)
168 hdb_entry_get_pw_change_time(&ent.entry, &out->last_pwd_change);
169 if(mask & KADM5_ATTRIBUTES){
170 out->attributes |= ent.entry.flags.postdate ? 0 : KRB5_KDB_DISALLOW_POSTDATED;
171 out->attributes |= ent.entry.flags.forwardable ? 0 : KRB5_KDB_DISALLOW_FORWARDABLE;
172 out->attributes |= ent.entry.flags.initial ? KRB5_KDB_DISALLOW_TGT_BASED : 0;
173 out->attributes |= ent.entry.flags.renewable ? 0 : KRB5_KDB_DISALLOW_RENEWABLE;
174 out->attributes |= ent.entry.flags.proxiable ? 0 : KRB5_KDB_DISALLOW_PROXIABLE;
175 out->attributes |= ent.entry.flags.invalid ? KRB5_KDB_DISALLOW_ALL_TIX : 0;
176 out->attributes |= ent.entry.flags.require_preauth ? KRB5_KDB_REQUIRES_PRE_AUTH : 0;
177 out->attributes |= ent.entry.flags.require_pwchange ? KRB5_KDB_REQUIRES_PWCHANGE : 0;
178 out->attributes |= ent.entry.flags.server ? 0 : KRB5_KDB_DISALLOW_SVR;
179 out->attributes |= ent.entry.flags.change_pw ? KRB5_KDB_PWCHANGE_SERVICE : 0;
180 out->attributes |= ent.entry.flags.ok_as_delegate ? KRB5_KDB_OK_AS_DELEGATE : 0;
181 out->attributes |= ent.entry.flags.trusted_for_delegation ? KRB5_KDB_TRUSTED_FOR_DELEGATION : 0;
182 out->attributes |= ent.entry.flags.allow_kerberos4 ? KRB5_KDB_ALLOW_KERBEROS4 : 0;
183 out->attributes |= ent.entry.flags.allow_digest ? KRB5_KDB_ALLOW_DIGEST : 0;
184 }
185 if(mask & KADM5_MAX_LIFE) {
186 if(ent.entry.max_life)
187 out->max_life = *ent.entry.max_life;
188 else
189 out->max_life = INT_MAX;
190 }
191 if(mask & KADM5_MOD_TIME) {
192 if(ent.entry.modified_by)
193 out->mod_date = ent.entry.modified_by->time;
194 else
195 out->mod_date = ent.entry.created_by.time;
196 }
197 if(mask & KADM5_MOD_NAME) {
198 if(ent.entry.modified_by) {
199 if (ent.entry.modified_by->principal != NULL)
200 ret = krb5_copy_principal(context->context,
201 ent.entry.modified_by->principal,
202 &out->mod_name);
203 } else if(ent.entry.created_by.principal != NULL)
204 ret = krb5_copy_principal(context->context,
205 ent.entry.created_by.principal,
206 &out->mod_name);
207 else
208 out->mod_name = NULL;
209 }
210 if(ret)
211 goto out;
212
213 if(mask & KADM5_KVNO)
214 out->kvno = ent.entry.kvno;
215 if(mask & KADM5_MKVNO) {
216 size_t n;
217 out->mkvno = 0; /* XXX */
218 for(n = 0; n < ent.entry.keys.len; n++)
219 if(ent.entry.keys.val[n].mkvno) {
220 out->mkvno = *ent.entry.keys.val[n].mkvno; /* XXX this isn't right */
221 break;
222 }
223 }
224 #if 0 /* XXX implement */
225 if(mask & KADM5_AUX_ATTRIBUTES)
226 ;
227 if(mask & KADM5_LAST_SUCCESS)
228 ;
229 if(mask & KADM5_LAST_FAILED)
230 ;
231 if(mask & KADM5_FAIL_AUTH_COUNT)
232 ;
233 #endif
234 if(mask & KADM5_POLICY) {
235 HDB_extension *ext;
236
237 ext = hdb_find_extension(&ent.entry, choice_HDB_extension_data_policy);
238 if (ext == NULL) {
239 out->policy = strdup("default");
240 /* It's OK if we retun NULL instead of "default" */
241 } else {
242 out->policy = strdup(ext->data.u.policy);
243 if (out->policy == NULL) {
244 ret = ENOMEM;
245 goto out;
246 }
247 }
248 }
249 if(mask & KADM5_MAX_RLIFE) {
250 if(ent.entry.max_renew)
251 out->max_renewable_life = *ent.entry.max_renew;
252 else
253 out->max_renewable_life = INT_MAX;
254 }
255 if(mask & KADM5_KEY_DATA){
256 size_t i;
257 size_t n_keys = ent.entry.keys.len;
258 krb5_salt salt;
259 HDB_extension *ext;
260 HDB_Ext_KeySet *hist_keys = NULL;
261
262 /* Don't return stale keys to kadm5 clients */
263 ret = hdb_prune_keys(context->context, &ent.entry);
264 if (ret)
265 goto out;
266 ext = hdb_find_extension(&ent.entry, choice_HDB_extension_data_hist_keys);
267 if (ext != NULL)
268 hist_keys = &ext->data.u.hist_keys;
269
270 krb5_get_pw_salt(context->context, ent.entry.principal, &salt);
271 for (i = 0; hist_keys != NULL && i < hist_keys->len; i++)
272 n_keys += hist_keys->val[i].keys.len;
273 out->key_data = malloc(n_keys * sizeof(*out->key_data));
274 if (out->key_data == NULL && n_keys != 0) {
275 ret = ENOMEM;
276 goto out;
277 }
278 out->n_key_data = 0;
279 ret = copy_keyset_to_kadm5(context, ent.entry.kvno, ent.entry.keys.len,
280 ent.entry.keys.val, &salt, out);
281 if (ret)
282 goto out;
283 for (i = 0; hist_keys != NULL && i < hist_keys->len; i++) {
284 ret = copy_keyset_to_kadm5(context, hist_keys->val[i].kvno,
285 hist_keys->val[i].keys.len,
286 hist_keys->val[i].keys.val,
287 &salt, out);
288 if (ret)
289 goto out;
290 }
291 krb5_free_salt(context->context, salt);
292 assert( out->n_key_data == n_keys );
293 }
294 if (ret)
295 goto out;
296 if(mask & KADM5_TL_DATA) {
297 time_t last_pw_expire;
298 const HDB_Ext_PKINIT_acl *acl;
299 const HDB_Ext_Aliases *aliases;
300
301 ret = hdb_entry_get_pw_change_time(&ent.entry, &last_pw_expire);
302 if (ret == 0 && last_pw_expire) {
303 unsigned char buf[4];
304 _krb5_put_int(buf, last_pw_expire, sizeof(buf));
305 ret = add_tl_data(out, KRB5_TL_LAST_PWD_CHANGE, buf, sizeof(buf));
306 }
307 if (ret)
308 goto out;
309 /*
310 * If the client was allowed to get key data, let it have the
311 * password too.
312 */
313 if (mask & KADM5_KEY_DATA) {
314 heim_utf8_string pw;
315
316 ret = hdb_entry_get_password(context->context,
317 context->db, &ent.entry, &pw);
318 if (ret == 0) {
319 (void) add_tl_data(out, KRB5_TL_PASSWORD, pw, strlen(pw) + 1);
320 free(pw);
321 }
322 krb5_clear_error_message(context->context);
323 }
324
325 ret = hdb_entry_get_pkinit_acl(&ent.entry, &acl);
326 if (ret == 0 && acl) {
327 krb5_data buf;
328 size_t len;
329
330 ASN1_MALLOC_ENCODE(HDB_Ext_PKINIT_acl, buf.data, buf.length,
331 acl, &len, ret);
332 if (ret)
333 goto out;
334 if (len != buf.length)
335 krb5_abortx(context->context,
336 "internal ASN.1 encoder error");
337 ret = add_tl_data(out, KRB5_TL_PKINIT_ACL, buf.data, buf.length);
338 free(buf.data);
339 if (ret)
340 goto out;
341 }
342 if (ret)
343 goto out;
344
345 ret = hdb_entry_get_aliases(&ent.entry, &aliases);
346 if (ret == 0 && aliases) {
347 krb5_data buf;
348 size_t len;
349
350 ASN1_MALLOC_ENCODE(HDB_Ext_Aliases, buf.data, buf.length,
351 aliases, &len, ret);
352 if (ret)
353 goto out;
354 if (len != buf.length)
355 krb5_abortx(context->context,
356 "internal ASN.1 encoder error");
357 ret = add_tl_data(out, KRB5_TL_ALIASES, buf.data, buf.length);
358 free(buf.data);
359 if (ret)
360 goto out;
361 }
362 if (ret)
363 goto out;
364 }
365
366 out:
367 if (ret)
368 kadm5_free_principal_ent(context, out);
369 hdb_free_entry(context->context, &ent);
370
371 return _kadm5_error_code(ret);
372 }
373