xref: /freebsd/crypto/heimdal/kadmin/server.c (revision ae83180158c4c937f170e31eff311b18c0286a93)
1 /*
2  * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan
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 "kadmin_locl.h"
35 #include <krb5-private.h>
36 
37 RCSID("$Id: server.c,v 1.33 2001/07/23 13:46:47 joda Exp $");
38 
39 static kadm5_ret_t
40 kadmind_dispatch(void *kadm_handle, krb5_boolean initial,
41 		 krb5_data *in, krb5_data *out)
42 {
43     kadm5_ret_t ret;
44     int32_t cmd, mask, tmp;
45     kadm5_server_context *context = kadm_handle;
46     char client[128], name[128], name2[128];
47     char *op = "";
48     krb5_principal princ, princ2;
49     kadm5_principal_ent_rec ent;
50     char *password, *exp;
51     krb5_keyblock *new_keys;
52     int n_keys;
53     char **princs;
54     int n_princs;
55     krb5_storage *sp;
56 
57     krb5_unparse_name_fixed(context->context, context->caller,
58 			    client, sizeof(client));
59 
60     sp = krb5_storage_from_data(in);
61 
62     krb5_ret_int32(sp, &cmd);
63     switch(cmd){
64     case kadm_get:{
65 	op = "GET";
66 	ret = krb5_ret_principal(sp, &princ);
67 	if(ret)
68 	    goto fail;
69 	ret = krb5_ret_int32(sp, &mask);
70 	if(ret){
71 	    krb5_free_principal(context->context, princ);
72 	    goto fail;
73 	}
74 	krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
75 	krb5_warnx(context->context, "%s: %s %s", client, op, name);
76 	ret = _kadm5_acl_check_permission(context, KADM5_PRIV_GET, princ);
77 	if(ret){
78 	    krb5_free_principal(context->context, princ);
79 	    goto fail;
80 	}
81 	ret = kadm5_get_principal(kadm_handle, princ, &ent, mask);
82 	krb5_storage_free(sp);
83 	sp = krb5_storage_emem();
84 	krb5_store_int32(sp, ret);
85 	if(ret == 0){
86 	    kadm5_store_principal_ent(sp, &ent);
87 	    kadm5_free_principal_ent(kadm_handle, &ent);
88 	}
89 	krb5_free_principal(context->context, princ);
90 	break;
91     }
92     case kadm_delete:{
93 	op = "DELETE";
94 	ret = krb5_ret_principal(sp, &princ);
95 	if(ret)
96 	    goto fail;
97 	krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
98 	krb5_warnx(context->context, "%s: %s %s", client, op, name);
99 	ret = _kadm5_acl_check_permission(context, KADM5_PRIV_DELETE, princ);
100 	if(ret){
101 	    krb5_free_principal(context->context, princ);
102 	    goto fail;
103 	}
104 	ret = kadm5_delete_principal(kadm_handle, princ);
105 	krb5_free_principal(context->context, princ);
106 	krb5_storage_free(sp);
107 	sp = krb5_storage_emem();
108 	krb5_store_int32(sp, ret);
109 	break;
110     }
111     case kadm_create:{
112 	op = "CREATE";
113 	ret = kadm5_ret_principal_ent(sp, &ent);
114 	if(ret)
115 	    goto fail;
116 	ret = krb5_ret_int32(sp, &mask);
117 	if(ret){
118 	    kadm5_free_principal_ent(context->context, &ent);
119 	    goto fail;
120 	}
121 	ret = krb5_ret_string(sp, &password);
122 	if(ret){
123 	    kadm5_free_principal_ent(context->context, &ent);
124 	    goto fail;
125 	}
126 	krb5_unparse_name_fixed(context->context, ent.principal,
127 				name, sizeof(name));
128 	krb5_warnx(context->context, "%s: %s %s", client, op, name);
129 	ret = _kadm5_acl_check_permission(context, KADM5_PRIV_ADD,
130 					  ent.principal);
131 	if(ret){
132 	    kadm5_free_principal_ent(context->context, &ent);
133 	    memset(password, 0, strlen(password));
134 	    free(password);
135 	    goto fail;
136 	}
137 	ret = kadm5_create_principal(kadm_handle, &ent,
138 				     mask, password);
139 	kadm5_free_principal_ent(kadm_handle, &ent);
140 	memset(password, 0, strlen(password));
141 	free(password);
142 	krb5_storage_free(sp);
143 	sp = krb5_storage_emem();
144 	krb5_store_int32(sp, ret);
145 	break;
146     }
147     case kadm_modify:{
148 	op = "MODIFY";
149 	ret = kadm5_ret_principal_ent(sp, &ent);
150 	if(ret)
151 	    goto fail;
152 	ret = krb5_ret_int32(sp, &mask);
153 	if(ret){
154 	    kadm5_free_principal_ent(context, &ent);
155 	    goto fail;
156 	}
157 	krb5_unparse_name_fixed(context->context, ent.principal,
158 				name, sizeof(name));
159 	krb5_warnx(context->context, "%s: %s %s", client, op, name);
160 	ret = _kadm5_acl_check_permission(context, KADM5_PRIV_MODIFY,
161 					  ent.principal);
162 	if(ret){
163 	    kadm5_free_principal_ent(context, &ent);
164 	    goto fail;
165 	}
166 	ret = kadm5_modify_principal(kadm_handle, &ent, mask);
167 	kadm5_free_principal_ent(kadm_handle, &ent);
168 	krb5_storage_free(sp);
169 	sp = krb5_storage_emem();
170 	krb5_store_int32(sp, ret);
171 	break;
172     }
173     case kadm_rename:{
174 	op = "RENAME";
175 	ret = krb5_ret_principal(sp, &princ);
176 	if(ret)
177 	    goto fail;
178 	ret = krb5_ret_principal(sp, &princ2);
179 	if(ret){
180 	    krb5_free_principal(context->context, princ);
181 	    goto fail;
182 	}
183 	krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
184 	krb5_unparse_name_fixed(context->context, princ2, name2, sizeof(name2));
185 	krb5_warnx(context->context, "%s: %s %s -> %s",
186 		   client, op, name, name2);
187 	ret = _kadm5_acl_check_permission(context,
188 					  KADM5_PRIV_ADD,
189 					  princ2)
190 	    || _kadm5_acl_check_permission(context,
191 					   KADM5_PRIV_DELETE,
192 					   princ);
193 	if(ret){
194 	    krb5_free_principal(context->context, princ);
195 	    goto fail;
196 	}
197 	ret = kadm5_rename_principal(kadm_handle, princ, princ2);
198 	krb5_free_principal(context->context, princ);
199 	krb5_free_principal(context->context, princ2);
200 	krb5_storage_free(sp);
201 	sp = krb5_storage_emem();
202 	krb5_store_int32(sp, ret);
203 	break;
204     }
205     case kadm_chpass:{
206 	op = "CHPASS";
207 	ret = krb5_ret_principal(sp, &princ);
208 	if(ret)
209 	    goto fail;
210 	ret = krb5_ret_string(sp, &password);
211 	if(ret){
212 	    krb5_free_principal(context->context, princ);
213 	    goto fail;
214 	}
215 	krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
216 	krb5_warnx(context->context, "%s: %s %s", client, op, name);
217 
218 	/*
219 	 * The change is allowed if at least one of:
220 	 * a) it's for the principal him/herself and this was an initial ticket
221 	 * b) the user is on the CPW ACL.
222 	 */
223 
224 	if (initial
225 	    && krb5_principal_compare (context->context, context->caller,
226 				       princ))
227 	    ret = 0;
228 	else
229 	    ret = _kadm5_acl_check_permission(context, KADM5_PRIV_CPW, princ);
230 
231 	if(ret) {
232 	    krb5_free_principal(context->context, princ);
233 	    goto fail;
234 	}
235 	ret = kadm5_chpass_principal(kadm_handle, princ, password);
236 	krb5_free_principal(context->context, princ);
237 	memset(password, 0, strlen(password));
238 	free(password);
239 	krb5_storage_free(sp);
240 	sp = krb5_storage_emem();
241 	krb5_store_int32(sp, ret);
242 	break;
243     }
244     case kadm_chpass_with_key:{
245 	int i;
246 	krb5_key_data *key_data;
247 	int n_key_data;
248 
249 	op = "CHPASS_WITH_KEY";
250 	ret = krb5_ret_principal(sp, &princ);
251 	if(ret)
252 	    goto fail;
253 	ret = krb5_ret_int32(sp, &n_key_data);
254 	if (ret) {
255 	    krb5_free_principal(context->context, princ);
256 	    goto fail;
257 	}
258 
259 	key_data = malloc (n_key_data * sizeof(*key_data));
260 	if (key_data == NULL) {
261 	    ret = ENOMEM;
262 	    krb5_free_principal(context->context, princ);
263 	    goto fail;
264 	}
265 
266 	for (i = 0; i < n_key_data; ++i) {
267 	    ret = kadm5_ret_key_data (sp, &key_data[i]);
268 	    if (ret) {
269 		int16_t dummy = i;
270 
271 		kadm5_free_key_data (context, &dummy, key_data);
272 		free (key_data);
273 		krb5_free_principal(context->context, princ);
274 		goto fail;
275 	    }
276 	}
277 
278 	krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
279 	krb5_warnx(context->context, "%s: %s %s", client, op, name);
280 
281 	/*
282 	 * The change is allowed if at least one of:
283 	 * a) it's for the principal him/herself and this was an initial ticket
284 	 * b) the user is on the CPW ACL.
285 	 */
286 
287 	if (initial
288 	    && krb5_principal_compare (context->context, context->caller,
289 				       princ))
290 	    ret = 0;
291 	else
292 	    ret = _kadm5_acl_check_permission(context, KADM5_PRIV_CPW, princ);
293 
294 	if(ret) {
295 	    int16_t dummy = n_key_data;
296 
297 	    kadm5_free_key_data (context, &dummy, key_data);
298 	    free (key_data);
299 	    krb5_free_principal(context->context, princ);
300 	    goto fail;
301 	}
302 	ret = kadm5_chpass_principal_with_key(kadm_handle, princ,
303 					      n_key_data, key_data);
304 	{
305 	    int16_t dummy = n_key_data;
306 	    kadm5_free_key_data (context, &dummy, key_data);
307 	}
308 	free (key_data);
309 	krb5_free_principal(context->context, princ);
310 	krb5_storage_free(sp);
311 	sp = krb5_storage_emem();
312 	krb5_store_int32(sp, ret);
313 	break;
314     }
315     case kadm_randkey:{
316 	op = "RANDKEY";
317 	ret = krb5_ret_principal(sp, &princ);
318 	if(ret)
319 	    goto fail;
320 	krb5_unparse_name_fixed(context->context, princ, name, sizeof(name));
321 	krb5_warnx(context->context, "%s: %s %s", client, op, name);
322 	/*
323 	 * The change is allowed if at least one of:
324 	 * a) it's for the principal him/herself and this was an initial ticket
325 	 * b) the user is on the CPW ACL.
326 	 */
327 
328 	if (initial
329 	    && krb5_principal_compare (context->context, context->caller,
330 				       princ))
331 	    ret = 0;
332 	else
333 	    ret = _kadm5_acl_check_permission(context, KADM5_PRIV_CPW, princ);
334 
335 	if(ret) {
336 	    krb5_free_principal(context->context, princ);
337 	    goto fail;
338 	}
339 	ret = kadm5_randkey_principal(kadm_handle, princ,
340 				      &new_keys, &n_keys);
341 	krb5_free_principal(context->context, princ);
342 	krb5_storage_free(sp);
343 	sp = krb5_storage_emem();
344 	krb5_store_int32(sp, ret);
345 	if(ret == 0){
346 	    int i;
347 	    krb5_store_int32(sp, n_keys);
348 	    for(i = 0; i < n_keys; i++){
349 		krb5_store_keyblock(sp, new_keys[i]);
350 		krb5_free_keyblock_contents(context->context, &new_keys[i]);
351 	    }
352 	}
353 	break;
354     }
355     case kadm_get_privs:{
356 	ret = kadm5_get_privs(kadm_handle, &mask);
357 	krb5_storage_free(sp);
358 	sp = krb5_storage_emem();
359 	krb5_store_int32(sp, ret);
360 	if(ret == 0)
361 	    krb5_store_int32(sp, mask);
362 	break;
363     }
364     case kadm_get_princs:{
365 	op = "LIST";
366 	ret = krb5_ret_int32(sp, &tmp);
367 	if(ret)
368 	    goto fail;
369 	if(tmp){
370 	    ret = krb5_ret_string(sp, &exp);
371 	    if(ret)
372 		goto fail;
373 	}else
374 	    exp = NULL;
375 	krb5_warnx(context->context, "%s: %s %s", client, op, exp ? exp : "*");
376 	ret = _kadm5_acl_check_permission(context, KADM5_PRIV_LIST, NULL);
377 	if(ret){
378 	    free(exp);
379 	    goto fail;
380 	}
381 	ret = kadm5_get_principals(kadm_handle, exp, &princs, &n_princs);
382 	free(exp);
383 	krb5_storage_free(sp);
384 	sp = krb5_storage_emem();
385 	krb5_store_int32(sp, ret);
386 	if(ret == 0){
387 	    int i;
388 	    krb5_store_int32(sp, n_princs);
389 	    for(i = 0; i < n_princs; i++)
390 		krb5_store_string(sp, princs[i]);
391 	    kadm5_free_name_list(kadm_handle, princs, &n_princs);
392 	}
393 	break;
394     }
395     default:
396 	krb5_warnx(context->context, "%s: UNKNOWN OP %d", client, cmd);
397 	krb5_storage_free(sp);
398 	sp = krb5_storage_emem();
399 	krb5_store_int32(sp, KADM5_FAILURE);
400 	break;
401     }
402     krb5_storage_to_data(sp, out);
403     krb5_storage_free(sp);
404     return 0;
405 fail:
406     krb5_warn(context->context, ret, "%s", op);
407     sp->seek(sp, 0, SEEK_SET);
408     krb5_store_int32(sp, ret);
409     krb5_storage_to_data(sp, out);
410     krb5_storage_free(sp);
411     return 0;
412 }
413 
414 static void
415 v5_loop (krb5_context context,
416 	 krb5_auth_context ac,
417 	 krb5_boolean initial,
418 	 void *kadm_handle,
419 	 int fd)
420 {
421     krb5_error_code ret;
422     krb5_data in, out;
423 
424     for (;;) {
425 	doing_useful_work = 0;
426 	if(term_flag)
427 	    exit(0);
428 	ret = krb5_read_priv_message(context, ac, &fd, &in);
429 	if(ret == HEIM_ERR_EOF)
430 	    exit(0);
431 	if(ret)
432 	    krb5_err(context, 1, ret, "krb5_read_priv_message");
433 	doing_useful_work = 1;
434 	kadmind_dispatch(kadm_handle, initial, &in, &out);
435 	krb5_data_free(&in);
436 	ret = krb5_write_priv_message(context, ac, &fd, &out);
437 	if(ret)
438 	    krb5_err(context, 1, ret, "krb5_write_priv_message");
439     }
440 }
441 
442 static krb5_boolean
443 match_appl_version(void *data, const char *appl_version)
444 {
445     unsigned minor;
446     if(sscanf(appl_version, "KADM0.%u", &minor) != 1)
447 	return 0;
448     *(unsigned*)data = minor;
449     return 1;
450 }
451 
452 static void
453 handle_v5(krb5_context context,
454 	  krb5_auth_context ac,
455 	  krb5_keytab keytab,
456 	  int len,
457 	  int fd)
458 {
459     krb5_error_code ret;
460     u_char version[sizeof(KRB5_SENDAUTH_VERSION)];
461     krb5_ticket *ticket;
462     char *server_name;
463     char *client;
464     void *kadm_handle;
465     ssize_t n;
466     krb5_boolean initial;
467 
468     unsigned kadm_version;
469     kadm5_config_params realm_params;
470 
471     if (len != sizeof(KRB5_SENDAUTH_VERSION))
472 	krb5_errx(context, 1, "bad sendauth len %d", len);
473     n = krb5_net_read(context, &fd, version, len);
474     if (n < 0)
475 	krb5_err (context, 1, errno, "reading sendauth version");
476     if (n == 0)
477 	krb5_errx (context, 1, "EOF reading sendauth version");
478     if(memcmp(version, KRB5_SENDAUTH_VERSION, len) != 0)
479 	krb5_errx(context, 1, "bad sendauth version %.8s", version);
480 
481     ret = krb5_recvauth_match_version(context, &ac, &fd,
482 				      match_appl_version, &kadm_version,
483 				      NULL, KRB5_RECVAUTH_IGNORE_VERSION,
484 				      keytab, &ticket);
485     if(ret == KRB5_KT_NOTFOUND)
486 	krb5_errx(context, 1, "krb5_recvauth: key not found");
487     if(ret)
488 	krb5_err(context, 1, ret, "krb5_recvauth");
489 
490     ret = krb5_unparse_name (context, ticket->server, &server_name);
491     if (ret)
492 	krb5_err (context, 1, ret, "krb5_unparse_name");
493 
494     if (strncmp (server_name, KADM5_ADMIN_SERVICE,
495 		 strlen(KADM5_ADMIN_SERVICE)) != 0)
496 	krb5_errx (context, 1, "ticket for strange principal (%s)",
497 		   server_name);
498 
499     free (server_name);
500 
501     memset(&realm_params, 0, sizeof(realm_params));
502 
503     if(kadm_version == 1) {
504 	krb5_data params;
505 	ret = krb5_read_priv_message(context, ac, &fd, &params);
506 	if(ret)
507 	    krb5_err(context, 1, ret, "krb5_read_priv_message");
508 	_kadm5_unmarshal_params(context, &params, &realm_params);
509     }
510 
511     initial = ticket->ticket.flags.initial;
512     ret = krb5_unparse_name(context, ticket->client, &client);
513     if (ret)
514 	krb5_err (context, 1, ret, "krb5_unparse_name");
515     krb5_free_ticket (context, ticket);
516     ret = kadm5_init_with_password_ctx(context,
517 				       client,
518 				       NULL,
519 				       KADM5_ADMIN_SERVICE,
520 				       &realm_params,
521 				       0, 0,
522 				       &kadm_handle);
523     if(ret)
524 	krb5_err (context, 1, ret, "kadm5_init_with_password_ctx");
525     v5_loop (context, ac, initial, kadm_handle, fd);
526 }
527 
528 krb5_error_code
529 kadmind_loop(krb5_context context,
530 	     krb5_auth_context ac,
531 	     krb5_keytab keytab,
532 	     int fd)
533 {
534     unsigned char tmp[4];
535     ssize_t n;
536     unsigned long len;
537 
538     n = krb5_net_read(context, &fd, tmp, 4);
539     if(n == 0)
540 	exit(0);
541     if(n < 0)
542 	krb5_err(context, 1, errno, "read");
543     _krb5_get_int(tmp, &len, 4);
544     if(len > 0xffff && (len & 0xffff) == ('K' << 8) + 'A') {
545 	len >>= 16;
546 #ifdef KRB4
547 	handle_v4(context, keytab, len, fd);
548 #else
549 	krb5_errx(context, 1, "packet appears to be version 4");
550 #endif
551     } else {
552 	handle_v5(context, ac, keytab, len, fd);
553     }
554     return 0;
555 }
556