1 /*
2 * Copyright 2002-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /* We need to use some engine deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
12
13 #include "internal/cryptlib.h"
14 #include "internal/rcu.h"
15 #include <stdio.h>
16 #include <ctype.h>
17 #include <openssl/crypto.h>
18 #include "internal/conf.h"
19 #include <openssl/conf_api.h>
20 #include "internal/dso.h"
21 #include "internal/thread_once.h"
22 #include <openssl/x509.h>
23 #include <openssl/trace.h>
24 #include <openssl/engine.h>
25 #include "conf_local.h"
26
27 DEFINE_STACK_OF(CONF_MODULE)
28 DEFINE_STACK_OF(CONF_IMODULE)
29
30 #define DSO_mod_init_name "OPENSSL_init"
31 #define DSO_mod_finish_name "OPENSSL_finish"
32
33 /*
34 * This structure contains a data about supported modules. entries in this
35 * table correspond to either dynamic or static modules.
36 */
37
38 struct conf_module_st {
39 /* DSO of this module or NULL if static */
40 DSO *dso;
41 /* Name of the module */
42 char *name;
43 /* Init function */
44 conf_init_func *init;
45 /* Finish function */
46 conf_finish_func *finish;
47 /* Number of successfully initialized modules */
48 int links;
49 void *usr_data;
50 };
51
52 /*
53 * This structure contains information about modules that have been
54 * successfully initialized. There may be more than one entry for a given
55 * module.
56 */
57
58 struct conf_imodule_st {
59 CONF_MODULE *pmod;
60 char *name;
61 char *value;
62 unsigned long flags;
63 void *usr_data;
64 };
65
66 static CRYPTO_ONCE init_module_list_lock = CRYPTO_ONCE_STATIC_INIT;
67 static CRYPTO_RCU_LOCK *module_list_lock = NULL;
68 static STACK_OF(CONF_MODULE) *supported_modules = NULL; /* protected by lock */
69 static STACK_OF(CONF_IMODULE) *initialized_modules = NULL; /* protected by lock */
70
71 static CRYPTO_ONCE load_builtin_modules = CRYPTO_ONCE_STATIC_INIT;
72
73 static void module_free(CONF_MODULE *md);
74 static void module_finish(CONF_IMODULE *imod);
75 static int module_run(const CONF *cnf, const char *name, const char *value,
76 unsigned long flags);
77 static CONF_MODULE *module_add(DSO *dso, const char *name,
78 conf_init_func *ifunc,
79 conf_finish_func *ffunc);
80 static CONF_MODULE *module_find(const char *name);
81 static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
82 const CONF *cnf);
83 static CONF_MODULE *module_load_dso(const CONF *cnf, const char *name,
84 const char *value);
85
86 static int conf_modules_finish_int(void);
87
module_lists_free(void)88 static void module_lists_free(void)
89 {
90 ossl_rcu_lock_free(module_list_lock);
91 module_list_lock = NULL;
92
93 sk_CONF_MODULE_free(supported_modules);
94 supported_modules = NULL;
95
96 sk_CONF_IMODULE_free(initialized_modules);
97 initialized_modules = NULL;
98 }
99
DEFINE_RUN_ONCE_STATIC(do_init_module_list_lock)100 DEFINE_RUN_ONCE_STATIC(do_init_module_list_lock)
101 {
102 module_list_lock = ossl_rcu_lock_new(1, NULL);
103 if (module_list_lock == NULL) {
104 ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
105 return 0;
106 }
107
108 return 1;
109 }
110
conf_diagnostics(const CONF * cnf)111 static int conf_diagnostics(const CONF *cnf)
112 {
113 int status;
114 long result = 0;
115
116 ERR_set_mark();
117 status = NCONF_get_number_e(cnf, NULL, "config_diagnostics", &result);
118 ERR_pop_to_mark();
119 if (status > 0) {
120 OSSL_LIB_CTX_set_conf_diagnostics(cnf->libctx, result > 0);
121 return result > 0;
122 }
123 return OSSL_LIB_CTX_get_conf_diagnostics(cnf->libctx);
124 }
125
126 /* Main function: load modules from a CONF structure */
127
CONF_modules_load(const CONF * cnf,const char * appname,unsigned long flags)128 int CONF_modules_load(const CONF *cnf, const char *appname,
129 unsigned long flags)
130 {
131 STACK_OF(CONF_VALUE) *values;
132 CONF_VALUE *vl;
133 char *vsection = NULL;
134 int ret, i;
135
136 if (!cnf)
137 return 1;
138
139 if (conf_diagnostics(cnf))
140 flags &= ~(CONF_MFLAGS_IGNORE_ERRORS
141 | CONF_MFLAGS_IGNORE_RETURN_CODES
142 | CONF_MFLAGS_SILENT
143 | CONF_MFLAGS_IGNORE_MISSING_FILE);
144
145 ERR_set_mark();
146 if (appname)
147 vsection = NCONF_get_string(cnf, NULL, appname);
148
149 if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
150 vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
151
152 if (!vsection) {
153 ERR_pop_to_mark();
154 return 1;
155 }
156
157 OSSL_TRACE1(CONF, "Configuration in section %s\n", vsection);
158 values = NCONF_get_section(cnf, vsection);
159
160 if (values == NULL) {
161 if (!(flags & CONF_MFLAGS_SILENT)) {
162 ERR_clear_last_mark();
163 ERR_raise_data(ERR_LIB_CONF,
164 CONF_R_OPENSSL_CONF_REFERENCES_MISSING_SECTION,
165 "openssl_conf=%s", vsection);
166 } else {
167 ERR_pop_to_mark();
168 }
169 return 0;
170 }
171 ERR_pop_to_mark();
172
173 for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
174 vl = sk_CONF_VALUE_value(values, i);
175 ERR_set_mark();
176 ret = module_run(cnf, vl->name, vl->value, flags);
177 OSSL_TRACE3(CONF, "Running module %s (%s) returned %d\n",
178 vl->name, vl->value, ret);
179 if (ret <= 0)
180 if (!(flags & CONF_MFLAGS_IGNORE_ERRORS)) {
181 ERR_clear_last_mark();
182 return ret;
183 }
184 ERR_pop_to_mark();
185 }
186
187 return 1;
188 }
189
CONF_modules_load_file_ex(OSSL_LIB_CTX * libctx,const char * filename,const char * appname,unsigned long flags)190 int CONF_modules_load_file_ex(OSSL_LIB_CTX *libctx, const char *filename,
191 const char *appname, unsigned long flags)
192 {
193 char *file = NULL;
194 CONF *conf = NULL;
195 int ret = 0, diagnostics = OSSL_LIB_CTX_get_conf_diagnostics(libctx);
196
197 ERR_set_mark();
198
199 if (filename == NULL) {
200 file = CONF_get1_default_config_file();
201 if (file == NULL)
202 goto err;
203 if (*file == '\0') {
204 /* Do not try to load an empty file name but do not error out */
205 ret = 1;
206 goto err;
207 }
208 } else {
209 file = (char *)filename;
210 }
211
212 conf = NCONF_new_ex(libctx, NULL);
213 if (conf == NULL)
214 goto err;
215
216 if (NCONF_load(conf, file, NULL) <= 0) {
217 if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) && (ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
218 ret = 1;
219 }
220 goto err;
221 }
222
223 ret = CONF_modules_load(conf, appname, flags);
224 /* CONF_modules_load() might change the diagnostics setting, reread it. */
225 diagnostics = OSSL_LIB_CTX_get_conf_diagnostics(libctx);
226
227 err:
228 if (filename == NULL)
229 OPENSSL_free(file);
230 NCONF_free(conf);
231
232 if ((flags & CONF_MFLAGS_IGNORE_RETURN_CODES) != 0 && !diagnostics)
233 ret = 1;
234
235 if (ret > 0)
236 ERR_pop_to_mark();
237 else
238 ERR_clear_last_mark();
239
240 return ret;
241 }
242
CONF_modules_load_file(const char * filename,const char * appname,unsigned long flags)243 int CONF_modules_load_file(const char *filename,
244 const char *appname, unsigned long flags)
245 {
246 return CONF_modules_load_file_ex(NULL, filename, appname, flags);
247 }
248
DEFINE_RUN_ONCE_STATIC(do_load_builtin_modules)249 DEFINE_RUN_ONCE_STATIC(do_load_builtin_modules)
250 {
251 OPENSSL_load_builtin_modules();
252 #ifndef OPENSSL_NO_ENGINE
253 /* Need to load ENGINEs */
254 ENGINE_load_builtin_engines();
255 #endif
256 return 1;
257 }
258
module_run(const CONF * cnf,const char * name,const char * value,unsigned long flags)259 static int module_run(const CONF *cnf, const char *name, const char *value,
260 unsigned long flags)
261 {
262 CONF_MODULE *md;
263 int ret;
264
265 if (!RUN_ONCE(&load_builtin_modules, do_load_builtin_modules))
266 return -1;
267
268 md = module_find(name);
269
270 /* Module not found: try to load DSO */
271 if (!md && !(flags & CONF_MFLAGS_NO_DSO))
272 md = module_load_dso(cnf, name, value);
273
274 if (!md) {
275 if (!(flags & CONF_MFLAGS_SILENT)) {
276 ERR_raise_data(ERR_LIB_CONF, CONF_R_UNKNOWN_MODULE_NAME,
277 "module=%s", name);
278 }
279 return -1;
280 }
281
282 ret = module_init(md, name, value, cnf);
283
284 if (ret <= 0) {
285 if (!(flags & CONF_MFLAGS_SILENT))
286 ERR_raise_data(ERR_LIB_CONF, CONF_R_MODULE_INITIALIZATION_ERROR,
287 "module=%s, value=%s retcode=%-8d",
288 name, value, ret);
289 }
290
291 return ret;
292 }
293
294 /* Load a module from a DSO */
module_load_dso(const CONF * cnf,const char * name,const char * value)295 static CONF_MODULE *module_load_dso(const CONF *cnf,
296 const char *name, const char *value)
297 {
298 DSO *dso = NULL;
299 conf_init_func *ifunc;
300 conf_finish_func *ffunc;
301 const char *path = NULL;
302 int errcode = 0;
303 CONF_MODULE *md;
304
305 /* Look for alternative path in module section */
306 path = _CONF_get_string(cnf, value, "path");
307 if (path == NULL) {
308 path = name;
309 }
310 dso = DSO_load(NULL, path, NULL, 0);
311 if (dso == NULL) {
312 errcode = CONF_R_ERROR_LOADING_DSO;
313 goto err;
314 }
315 ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
316 if (ifunc == NULL) {
317 errcode = CONF_R_MISSING_INIT_FUNCTION;
318 goto err;
319 }
320 ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
321 /* All OK, add module */
322 md = module_add(dso, name, ifunc, ffunc);
323
324 if (md == NULL)
325 goto err;
326
327 return md;
328
329 err:
330 DSO_free(dso);
331 ERR_raise_data(ERR_LIB_CONF, errcode, "module=%s, path=%s", name, path);
332 return NULL;
333 }
334
335 /* add module to list */
module_add(DSO * dso,const char * name,conf_init_func * ifunc,conf_finish_func * ffunc)336 static CONF_MODULE *module_add(DSO *dso, const char *name,
337 conf_init_func *ifunc, conf_finish_func *ffunc)
338 {
339 CONF_MODULE *tmod = NULL;
340 STACK_OF(CONF_MODULE) *old_modules;
341 STACK_OF(CONF_MODULE) *new_modules;
342
343 if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
344 return NULL;
345
346 ossl_rcu_write_lock(module_list_lock);
347
348 old_modules = ossl_rcu_deref(&supported_modules);
349
350 if (old_modules == NULL)
351 new_modules = sk_CONF_MODULE_new_null();
352 else
353 new_modules = sk_CONF_MODULE_dup(old_modules);
354
355 if (new_modules == NULL)
356 goto err;
357
358 if ((tmod = OPENSSL_zalloc(sizeof(*tmod))) == NULL)
359 goto err;
360
361 tmod->dso = dso;
362 tmod->name = OPENSSL_strdup(name);
363 tmod->init = ifunc;
364 tmod->finish = ffunc;
365 if (tmod->name == NULL)
366 goto err;
367
368 if (!sk_CONF_MODULE_push(new_modules, tmod))
369 goto err;
370
371 ossl_rcu_assign_ptr(&supported_modules, &new_modules);
372 ossl_rcu_write_unlock(module_list_lock);
373 ossl_synchronize_rcu(module_list_lock);
374
375 sk_CONF_MODULE_free(old_modules);
376 return tmod;
377
378 err:
379 ossl_rcu_write_unlock(module_list_lock);
380 if (tmod != NULL) {
381 OPENSSL_free(tmod->name);
382 OPENSSL_free(tmod);
383 }
384 sk_CONF_MODULE_free(new_modules);
385 return NULL;
386 }
387
388 /*
389 * Find a module from the list. We allow module names of the form
390 * modname.XXXX to just search for modname to allow the same module to be
391 * initialized more than once.
392 */
393
module_find(const char * name)394 static CONF_MODULE *module_find(const char *name)
395 {
396 CONF_MODULE *tmod;
397 int i, nchar;
398 char *p;
399 STACK_OF(CONF_MODULE) *mods;
400
401 p = strrchr(name, '.');
402
403 if (p)
404 nchar = p - name;
405 else
406 nchar = strlen(name);
407
408 if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
409 return NULL;
410
411 ossl_rcu_read_lock(module_list_lock);
412 mods = ossl_rcu_deref(&supported_modules);
413
414 for (i = 0; i < sk_CONF_MODULE_num(mods); i++) {
415 tmod = sk_CONF_MODULE_value(mods, i);
416 if (strncmp(tmod->name, name, nchar) == 0) {
417 ossl_rcu_read_unlock(module_list_lock);
418 return tmod;
419 }
420 }
421
422 ossl_rcu_read_unlock(module_list_lock);
423 return NULL;
424 }
425
426 /* initialize a module */
module_init(CONF_MODULE * pmod,const char * name,const char * value,const CONF * cnf)427 static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
428 const CONF *cnf)
429 {
430 int ret = 1;
431 int init_called = 0;
432 CONF_IMODULE *imod = NULL;
433 STACK_OF(CONF_IMODULE) *old_modules;
434 STACK_OF(CONF_IMODULE) *new_modules;
435
436 /* Otherwise add initialized module to list */
437 imod = OPENSSL_malloc(sizeof(*imod));
438 if (imod == NULL)
439 goto err;
440
441 imod->pmod = pmod;
442 imod->name = OPENSSL_strdup(name);
443 imod->value = OPENSSL_strdup(value);
444 imod->usr_data = NULL;
445
446 if (!imod->name || !imod->value)
447 goto memerr;
448
449 /* Try to initialize module */
450 if (pmod->init) {
451 ret = pmod->init(imod, cnf);
452 init_called = 1;
453 /* Error occurred, exit */
454 if (ret <= 0)
455 goto err;
456 }
457
458 if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
459 goto err;
460
461 ossl_rcu_write_lock(module_list_lock);
462
463 old_modules = ossl_rcu_deref(&initialized_modules);
464
465 if (old_modules == NULL)
466 new_modules = sk_CONF_IMODULE_new_null();
467 else
468 new_modules = sk_CONF_IMODULE_dup(old_modules);
469
470 if (new_modules == NULL) {
471 ossl_rcu_write_unlock(module_list_lock);
472 ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
473 goto err;
474 }
475
476 if (!sk_CONF_IMODULE_push(new_modules, imod)) {
477 ossl_rcu_write_unlock(module_list_lock);
478 sk_CONF_IMODULE_free(new_modules);
479 ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
480 goto err;
481 }
482
483 pmod->links++;
484
485 ossl_rcu_assign_ptr(&initialized_modules, &new_modules);
486 ossl_rcu_write_unlock(module_list_lock);
487 ossl_synchronize_rcu(module_list_lock);
488 sk_CONF_IMODULE_free(old_modules);
489 return ret;
490
491 err:
492
493 /* We've started the module so we'd better finish it */
494 if (pmod->finish && init_called)
495 pmod->finish(imod);
496
497 memerr:
498 if (imod) {
499 OPENSSL_free(imod->name);
500 OPENSSL_free(imod->value);
501 OPENSSL_free(imod);
502 }
503
504 return -1;
505 }
506
507 /*
508 * Unload any dynamic modules that have a link count of zero: i.e. have no
509 * active initialized modules. If 'all' is set then all modules are unloaded
510 * including static ones.
511 */
512
CONF_modules_unload(int all)513 void CONF_modules_unload(int all)
514 {
515 int i;
516 CONF_MODULE *md;
517 STACK_OF(CONF_MODULE) *old_modules;
518 STACK_OF(CONF_MODULE) *new_modules;
519 STACK_OF(CONF_MODULE) *to_delete;
520
521 if (!conf_modules_finish_int()) /* also inits module list lock */
522 return;
523
524 ossl_rcu_write_lock(module_list_lock);
525
526 old_modules = ossl_rcu_deref(&supported_modules);
527 new_modules = sk_CONF_MODULE_dup(old_modules);
528
529 if (new_modules == NULL) {
530 ossl_rcu_write_unlock(module_list_lock);
531 return;
532 }
533
534 to_delete = sk_CONF_MODULE_new_null();
535
536 /* unload modules in reverse order */
537 for (i = sk_CONF_MODULE_num(new_modules) - 1; i >= 0; i--) {
538 md = sk_CONF_MODULE_value(new_modules, i);
539 /* If static or in use and 'all' not set ignore it */
540 if (((md->links > 0) || !md->dso) && !all)
541 continue;
542 /* Since we're working in reverse this is OK */
543 (void)sk_CONF_MODULE_delete(new_modules, i);
544 sk_CONF_MODULE_push(to_delete, md);
545 }
546
547 if (sk_CONF_MODULE_num(new_modules) == 0) {
548 sk_CONF_MODULE_free(new_modules);
549 new_modules = NULL;
550 }
551
552 ossl_rcu_assign_ptr(&supported_modules, &new_modules);
553 ossl_rcu_write_unlock(module_list_lock);
554 ossl_synchronize_rcu(module_list_lock);
555 sk_CONF_MODULE_free(old_modules);
556 sk_CONF_MODULE_pop_free(to_delete, module_free);
557 }
558
559 /* unload a single module */
module_free(CONF_MODULE * md)560 static void module_free(CONF_MODULE *md)
561 {
562 DSO_free(md->dso);
563 OPENSSL_free(md->name);
564 OPENSSL_free(md);
565 }
566
567 /* finish and free up all modules instances */
568
conf_modules_finish_int(void)569 static int conf_modules_finish_int(void)
570 {
571 CONF_IMODULE *imod;
572 STACK_OF(CONF_IMODULE) *old_modules;
573 STACK_OF(CONF_IMODULE) *new_modules = NULL;
574
575 if (!RUN_ONCE(&init_module_list_lock, do_init_module_list_lock))
576 return 0;
577
578 /* If module_list_lock is NULL here it means we were already unloaded */
579 if (module_list_lock == NULL)
580 return 0;
581
582 ossl_rcu_write_lock(module_list_lock);
583 old_modules = ossl_rcu_deref(&initialized_modules);
584 ossl_rcu_assign_ptr(&initialized_modules, &new_modules);
585 ossl_rcu_write_unlock(module_list_lock);
586 ossl_synchronize_rcu(module_list_lock);
587
588 while (sk_CONF_IMODULE_num(old_modules) > 0) {
589 imod = sk_CONF_IMODULE_pop(old_modules);
590 module_finish(imod);
591 }
592 sk_CONF_IMODULE_free(old_modules);
593
594 return 1;
595 }
596
CONF_modules_finish(void)597 void CONF_modules_finish(void)
598 {
599 conf_modules_finish_int();
600 }
601
602 /* finish a module instance */
603
module_finish(CONF_IMODULE * imod)604 static void module_finish(CONF_IMODULE *imod)
605 {
606 if (!imod)
607 return;
608 if (imod->pmod->finish)
609 imod->pmod->finish(imod);
610 imod->pmod->links--;
611 OPENSSL_free(imod->name);
612 OPENSSL_free(imod->value);
613 OPENSSL_free(imod);
614 }
615
616 /* Add a static module to OpenSSL */
617
CONF_module_add(const char * name,conf_init_func * ifunc,conf_finish_func * ffunc)618 int CONF_module_add(const char *name, conf_init_func *ifunc,
619 conf_finish_func *ffunc)
620 {
621 if (module_add(NULL, name, ifunc, ffunc))
622 return 1;
623 else
624 return 0;
625 }
626
ossl_config_modules_free(void)627 void ossl_config_modules_free(void)
628 {
629 CONF_modules_unload(1); /* calls CONF_modules_finish */
630 module_lists_free();
631 }
632
633 /* Utility functions */
634
CONF_imodule_get_name(const CONF_IMODULE * md)635 const char *CONF_imodule_get_name(const CONF_IMODULE *md)
636 {
637 return md->name;
638 }
639
CONF_imodule_get_value(const CONF_IMODULE * md)640 const char *CONF_imodule_get_value(const CONF_IMODULE *md)
641 {
642 return md->value;
643 }
644
CONF_imodule_get_usr_data(const CONF_IMODULE * md)645 void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
646 {
647 return md->usr_data;
648 }
649
CONF_imodule_set_usr_data(CONF_IMODULE * md,void * usr_data)650 void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
651 {
652 md->usr_data = usr_data;
653 }
654
CONF_imodule_get_module(const CONF_IMODULE * md)655 CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
656 {
657 return md->pmod;
658 }
659
CONF_imodule_get_flags(const CONF_IMODULE * md)660 unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
661 {
662 return md->flags;
663 }
664
CONF_imodule_set_flags(CONF_IMODULE * md,unsigned long flags)665 void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
666 {
667 md->flags = flags;
668 }
669
CONF_module_get_usr_data(CONF_MODULE * pmod)670 void *CONF_module_get_usr_data(CONF_MODULE *pmod)
671 {
672 return pmod->usr_data;
673 }
674
CONF_module_set_usr_data(CONF_MODULE * pmod,void * usr_data)675 void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
676 {
677 pmod->usr_data = usr_data;
678 }
679
680 /* Return default config file name */
CONF_get1_default_config_file(void)681 char *CONF_get1_default_config_file(void)
682 {
683 const char *t;
684 char *file, *sep = "";
685 size_t size;
686
687 if ((file = ossl_safe_getenv("OPENSSL_CONF")) != NULL)
688 return OPENSSL_strdup(file);
689
690 t = X509_get_default_cert_area();
691 /*
692 * On windows systems with -DOSSL_WINCTX set, if the needed registry
693 * keys are not yet set, openssl applets will return, due to an inability
694 * to locate various directories, like the default cert area. In that
695 * event, clone an empty string here, so that commands like openssl version
696 * continue to operate properly without needing to set OPENSSL_CONF.
697 * Applets like cms will fail gracefully later when they try to parse an
698 * empty config file
699 */
700 if (t == NULL)
701 return OPENSSL_strdup("");
702
703 #ifndef OPENSSL_SYS_VMS
704 sep = "/";
705 #endif
706 size = strlen(t) + strlen(sep) + strlen(OPENSSL_CONF) + 1;
707 file = OPENSSL_malloc(size);
708
709 if (file == NULL)
710 return NULL;
711 BIO_snprintf(file, size, "%s%s%s", t, sep, OPENSSL_CONF);
712
713 return file;
714 }
715
716 /*
717 * This function takes a list separated by 'sep' and calls the callback
718 * function giving the start and length of each member optionally stripping
719 * leading and trailing whitespace. This can be used to parse comma separated
720 * lists for example.
721 */
722
CONF_parse_list(const char * list_,int sep,int nospc,int (* list_cb)(const char * elem,int len,void * usr),void * arg)723 int CONF_parse_list(const char *list_, int sep, int nospc,
724 int (*list_cb)(const char *elem, int len, void *usr),
725 void *arg)
726 {
727 int ret;
728 const char *lstart, *tmpend, *p;
729
730 if (list_ == NULL) {
731 ERR_raise(ERR_LIB_CONF, CONF_R_LIST_CANNOT_BE_NULL);
732 return 0;
733 }
734
735 lstart = list_;
736 for (;;) {
737 if (nospc) {
738 while (*lstart && isspace((unsigned char)*lstart))
739 lstart++;
740 }
741 p = strchr(lstart, sep);
742 if (p == lstart || *lstart == '\0')
743 ret = list_cb(NULL, 0, arg);
744 else {
745 if (p)
746 tmpend = p - 1;
747 else
748 tmpend = lstart + strlen(lstart) - 1;
749 if (nospc) {
750 while (isspace((unsigned char)*tmpend))
751 tmpend--;
752 }
753 ret = list_cb(lstart, tmpend - lstart + 1, arg);
754 }
755 if (ret <= 0)
756 return ret;
757 if (p == NULL)
758 return 1;
759 lstart = p + 1;
760 }
761 }
762