1 /* $OpenBSD: conf_mod.c,v 1.38 2024/04/09 13:56:30 beck Exp $ */
2 /* Written by Stephen Henson (steve@openssl.org) for the OpenSSL
3 * project 2001.
4 */
5 /* ====================================================================
6 * Copyright (c) 2001 The OpenSSL Project. 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
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59 #include <ctype.h>
60 #include <stdio.h>
61 #include <string.h>
62 #include <unistd.h>
63
64 #include <openssl/conf.h>
65 #include <openssl/crypto.h>
66 #include <openssl/err.h>
67 #include <openssl/x509.h>
68
69 /* This structure contains data about supported modules. */
70 struct conf_module_st {
71 /* Name of the module */
72 char *name;
73 /* Init function */
74 conf_init_func *init;
75 /* Finish function */
76 conf_finish_func *finish;
77 /* Number of successfully initialized modules */
78 int links;
79 void *usr_data;
80 };
81
82
83 /* This structure contains information about modules that have been
84 * successfully initialized. There may be more than one entry for a
85 * given module.
86 */
87
88 struct conf_imodule_st {
89 CONF_MODULE *mod;
90 char *name;
91 char *value;
92 unsigned long flags;
93 void *usr_data;
94 };
95
96 static STACK_OF(CONF_MODULE) *supported_modules = NULL;
97 static STACK_OF(CONF_IMODULE) *initialized_modules = NULL;
98
99 static void module_free(CONF_MODULE *mod);
100 static void imodule_free(CONF_IMODULE *imod);
101 static void module_finish(CONF_IMODULE *imod);
102 static int module_run(const CONF *cnf, char *name, char *value,
103 unsigned long flags);
104 static int module_add(const char *name, conf_init_func *ifunc,
105 conf_finish_func *ffunc);
106 static CONF_MODULE *module_find(char *name);
107 static int module_init(CONF_MODULE *mod, char *name, char *value,
108 const CONF *cnf);
109
110 /* Main function: load modules from a CONF structure */
111
112 int
CONF_modules_load(const CONF * cnf,const char * appname,unsigned long flags)113 CONF_modules_load(const CONF *cnf, const char *appname, unsigned long flags)
114 {
115 STACK_OF(CONF_VALUE) *values;
116 CONF_VALUE *vl;
117 char *vsection = NULL;
118
119 int ret, i;
120
121 if (!cnf)
122 return 1;
123
124 if (appname)
125 vsection = NCONF_get_string(cnf, NULL, appname);
126
127 if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
128 vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
129
130 if (!vsection) {
131 ERR_clear_error();
132 return 1;
133 }
134
135 values = NCONF_get_section(cnf, vsection);
136
137 if (!values)
138 return 0;
139
140 for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
141 vl = sk_CONF_VALUE_value(values, i);
142 ret = module_run(cnf, vl->name, vl->value, flags);
143 if (ret <= 0)
144 if (!(flags & CONF_MFLAGS_IGNORE_ERRORS))
145 return ret;
146 }
147
148 return 1;
149 }
150 LCRYPTO_ALIAS(CONF_modules_load);
151
152 int
CONF_modules_load_file(const char * filename,const char * appname,unsigned long flags)153 CONF_modules_load_file(const char *filename, const char *appname,
154 unsigned long flags)
155 {
156 char *file = NULL;
157 CONF *conf = NULL;
158 int ret = 0;
159 conf = NCONF_new(NULL);
160 if (!conf)
161 goto err;
162
163 if (filename == NULL) {
164 file = CONF_get1_default_config_file();
165 if (!file)
166 goto err;
167 } else
168 file = (char *)filename;
169
170 if (NCONF_load(conf, file, NULL) <= 0) {
171 if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
172 (ERR_GET_REASON(ERR_peek_last_error()) ==
173 CONF_R_NO_SUCH_FILE)) {
174 ERR_clear_error();
175 ret = 1;
176 }
177 goto err;
178 }
179
180 ret = CONF_modules_load(conf, appname, flags);
181
182 err:
183 if (filename == NULL)
184 free(file);
185 NCONF_free(conf);
186
187 return ret;
188 }
189 LCRYPTO_ALIAS(CONF_modules_load_file);
190
191 static int
module_run(const CONF * cnf,char * name,char * value,unsigned long flags)192 module_run(const CONF *cnf, char *name, char *value, unsigned long flags)
193 {
194 CONF_MODULE *mod;
195 int ret;
196
197 if ((mod = module_find(name)) == NULL) {
198 if (!(flags & CONF_MFLAGS_SILENT)) {
199 CONFerror(CONF_R_UNKNOWN_MODULE_NAME);
200 ERR_asprintf_error_data("module=%s", name);
201 }
202 return -1;
203 }
204
205 ret = module_init(mod, name, value, cnf);
206
207 if (ret <= 0) {
208 if (!(flags & CONF_MFLAGS_SILENT)) {
209 CONFerror(CONF_R_MODULE_INITIALIZATION_ERROR);
210 ERR_asprintf_error_data
211 ("module=%s, value=%s, retcode=%-8d",
212 name, value, ret);
213 }
214 }
215
216 return ret;
217 }
218
219 static int
module_add(const char * name,conf_init_func * ifunc,conf_finish_func * ffunc)220 module_add(const char *name, conf_init_func *ifunc, conf_finish_func *ffunc)
221 {
222 CONF_MODULE *mod = NULL;
223 int ret = 0;
224
225 if (name == NULL)
226 goto err;
227
228 if (supported_modules == NULL)
229 supported_modules = sk_CONF_MODULE_new_null();
230 if (supported_modules == NULL)
231 goto err;
232
233 if ((mod = calloc(1, sizeof(*mod))) == NULL)
234 goto err;
235 if ((mod->name = strdup(name)) == NULL)
236 goto err;
237 mod->init = ifunc;
238 mod->finish = ffunc;
239
240 if (!sk_CONF_MODULE_push(supported_modules, mod))
241 goto err;
242 mod = NULL;
243
244 ret = 1;
245
246 err:
247 module_free(mod);
248
249 return ret;
250 }
251
252 /* Find a module from the list. We allow module names of the
253 * form modname.XXXX to just search for modname to allow the
254 * same module to be initialized more than once.
255 */
256
257 static CONF_MODULE *
module_find(char * name)258 module_find(char *name)
259 {
260 CONF_MODULE *mod;
261 int i, nchar;
262 char *p;
263
264 p = strrchr(name, '.');
265
266 if (p)
267 nchar = p - name;
268 else
269 nchar = strlen(name);
270
271 for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++) {
272 mod = sk_CONF_MODULE_value(supported_modules, i);
273 if (!strncmp(mod->name, name, nchar))
274 return mod;
275 }
276
277 return NULL;
278 }
279
280 /* initialize a module */
281 static int
module_init(CONF_MODULE * mod,char * name,char * value,const CONF * cnf)282 module_init(CONF_MODULE *mod, char *name, char *value, const CONF *cnf)
283 {
284 CONF_IMODULE *imod = NULL;
285 int need_finish = 0;
286 int ret = -1;
287
288 if (name == NULL || value == NULL)
289 goto err;
290
291 if ((imod = calloc(1, sizeof(*imod))) == NULL)
292 goto err;
293
294 imod->mod = mod;
295
296 if ((imod->name = strdup(name)) == NULL)
297 goto err;
298 if ((imod->value = strdup(value)) == NULL)
299 goto err;
300
301 if (mod->init != NULL) {
302 need_finish = 1;
303 if (mod->init(imod, cnf) <= 0)
304 goto err;
305 }
306
307 if (initialized_modules == NULL)
308 initialized_modules = sk_CONF_IMODULE_new_null();
309 if (initialized_modules == NULL)
310 goto err;
311
312 if (!sk_CONF_IMODULE_push(initialized_modules, imod))
313 goto err;
314 imod = NULL;
315 need_finish = 0;
316
317 mod->links++;
318
319 ret = 1;
320
321 err:
322 if (need_finish && mod->finish != NULL)
323 mod->finish(imod);
324
325 imodule_free(imod);
326
327 return ret;
328 }
329
330 /* Unload any dynamic modules that have a link count of zero:
331 * i.e. have no active initialized modules. If 'all' is set
332 * then all modules are unloaded including static ones.
333 */
334
335 void
CONF_modules_unload(int all)336 CONF_modules_unload(int all)
337 {
338 int i;
339 CONF_MODULE *mod;
340
341 CONF_modules_finish();
342
343 /* unload modules in reverse order */
344 for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--) {
345 mod = sk_CONF_MODULE_value(supported_modules, i);
346 if (!all)
347 continue;
348 /* Since we're working in reverse this is OK */
349 (void)sk_CONF_MODULE_delete(supported_modules, i);
350 module_free(mod);
351 }
352 if (sk_CONF_MODULE_num(supported_modules) == 0) {
353 sk_CONF_MODULE_free(supported_modules);
354 supported_modules = NULL;
355 }
356 }
357 LCRYPTO_ALIAS(CONF_modules_unload);
358
359 /* unload a single module */
360 static void
module_free(CONF_MODULE * mod)361 module_free(CONF_MODULE *mod)
362 {
363 if (mod == NULL)
364 return;
365
366 free(mod->name);
367 free(mod);
368 }
369
370 static void
imodule_free(CONF_IMODULE * imod)371 imodule_free(CONF_IMODULE *imod)
372 {
373 if (imod == NULL)
374 return;
375
376 free(imod->name);
377 free(imod->value);
378 free(imod);
379 }
380
381 /* finish and free up all modules instances */
382
383 void
CONF_modules_finish(void)384 CONF_modules_finish(void)
385 {
386 CONF_IMODULE *imod;
387
388 while (sk_CONF_IMODULE_num(initialized_modules) > 0) {
389 imod = sk_CONF_IMODULE_pop(initialized_modules);
390 module_finish(imod);
391 }
392 sk_CONF_IMODULE_free(initialized_modules);
393 initialized_modules = NULL;
394 }
395 LCRYPTO_ALIAS(CONF_modules_finish);
396
397 /* finish a module instance */
398
399 static void
module_finish(CONF_IMODULE * imod)400 module_finish(CONF_IMODULE *imod)
401 {
402 if (imod->mod->finish)
403 imod->mod->finish(imod);
404 imod->mod->links--;
405
406 imodule_free(imod);
407 }
408
409 /* Add a static module to OpenSSL */
410
411 int
CONF_module_add(const char * name,conf_init_func * ifunc,conf_finish_func * ffunc)412 CONF_module_add(const char *name, conf_init_func *ifunc, conf_finish_func *ffunc)
413 {
414 return module_add(name, ifunc, ffunc);
415 }
416 LCRYPTO_ALIAS(CONF_module_add);
417
418 void
CONF_modules_free(void)419 CONF_modules_free(void)
420 {
421 CONF_modules_finish();
422 CONF_modules_unload(1);
423 }
424 LCRYPTO_ALIAS(CONF_modules_free);
425
426 /* Utility functions */
427
428 const char *
CONF_imodule_get_name(const CONF_IMODULE * imod)429 CONF_imodule_get_name(const CONF_IMODULE *imod)
430 {
431 return imod->name;
432 }
433 LCRYPTO_ALIAS(CONF_imodule_get_name);
434
435 const char *
CONF_imodule_get_value(const CONF_IMODULE * imod)436 CONF_imodule_get_value(const CONF_IMODULE *imod)
437 {
438 return imod->value;
439 }
440 LCRYPTO_ALIAS(CONF_imodule_get_value);
441
442 void *
CONF_imodule_get_usr_data(const CONF_IMODULE * imod)443 CONF_imodule_get_usr_data(const CONF_IMODULE *imod)
444 {
445 return imod->usr_data;
446 }
447 LCRYPTO_ALIAS(CONF_imodule_get_usr_data);
448
449 void
CONF_imodule_set_usr_data(CONF_IMODULE * imod,void * usr_data)450 CONF_imodule_set_usr_data(CONF_IMODULE *imod, void *usr_data)
451 {
452 imod->usr_data = usr_data;
453 }
454 LCRYPTO_ALIAS(CONF_imodule_set_usr_data);
455
456 CONF_MODULE *
CONF_imodule_get_module(const CONF_IMODULE * imod)457 CONF_imodule_get_module(const CONF_IMODULE *imod)
458 {
459 return imod->mod;
460 }
461 LCRYPTO_ALIAS(CONF_imodule_get_module);
462
463 unsigned long
CONF_imodule_get_flags(const CONF_IMODULE * imod)464 CONF_imodule_get_flags(const CONF_IMODULE *imod)
465 {
466 return imod->flags;
467 }
468 LCRYPTO_ALIAS(CONF_imodule_get_flags);
469
470 void
CONF_imodule_set_flags(CONF_IMODULE * imod,unsigned long flags)471 CONF_imodule_set_flags(CONF_IMODULE *imod, unsigned long flags)
472 {
473 imod->flags = flags;
474 }
475 LCRYPTO_ALIAS(CONF_imodule_set_flags);
476
477 void *
CONF_module_get_usr_data(CONF_MODULE * mod)478 CONF_module_get_usr_data(CONF_MODULE *mod)
479 {
480 return mod->usr_data;
481 }
482 LCRYPTO_ALIAS(CONF_module_get_usr_data);
483
484 void
CONF_module_set_usr_data(CONF_MODULE * mod,void * usr_data)485 CONF_module_set_usr_data(CONF_MODULE *mod, void *usr_data)
486 {
487 mod->usr_data = usr_data;
488 }
489 LCRYPTO_ALIAS(CONF_module_set_usr_data);
490
491 /* Return default config file name */
492
493 char *
CONF_get1_default_config_file(void)494 CONF_get1_default_config_file(void)
495 {
496 char *file = NULL;
497
498 if (asprintf(&file, "%s/openssl.cnf",
499 X509_get_default_cert_area()) == -1)
500 return (NULL);
501 return file;
502 }
503 LCRYPTO_ALIAS(CONF_get1_default_config_file);
504
505 /* This function takes a list separated by 'sep' and calls the
506 * callback function giving the start and length of each member
507 * optionally stripping leading and trailing whitespace. This can
508 * be used to parse comma separated lists for example.
509 */
510
511 int
CONF_parse_list(const char * list_,int sep,int nospc,int (* list_cb)(const char * elem,int len,void * usr),void * arg)512 CONF_parse_list(const char *list_, int sep, int nospc,
513 int (*list_cb)(const char *elem, int len, void *usr), void *arg)
514 {
515 int ret;
516 const char *lstart, *tmpend, *p;
517
518 if (list_ == NULL) {
519 CONFerror(CONF_R_LIST_CANNOT_BE_NULL);
520 return 0;
521 }
522
523 lstart = list_;
524 for (;;) {
525 if (nospc) {
526 while (*lstart && isspace((unsigned char)*lstart))
527 lstart++;
528 }
529 p = strchr(lstart, sep);
530 if (p == lstart || !*lstart)
531 ret = list_cb(NULL, 0, arg);
532 else {
533 if (p)
534 tmpend = p - 1;
535 else
536 tmpend = lstart + strlen(lstart) - 1;
537 if (nospc) {
538 while (isspace((unsigned char)*tmpend))
539 tmpend--;
540 }
541 ret = list_cb(lstart, tmpend - lstart + 1, arg);
542 }
543 if (ret <= 0)
544 return ret;
545 if (p == NULL)
546 return 1;
547 lstart = p + 1;
548 }
549 }
550 LCRYPTO_ALIAS(CONF_parse_list);
551