crypto/conf/conf_mod.c

   1 /* conf_mod.c */
   2 /*
   3  * Written by Stephen Henson (steve@openssl.org) for the OpenSSL project
   4  * 2001.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2001-2018 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include <ctype.h>
  62 #include <openssl/crypto.h>
  63 #include "cryptlib.h"
  64 #include <openssl/conf.h>
  65 #include <openssl/dso.h>
  66 #include <openssl/x509.h>
  67
  68 #define DSO_mod_init_name "OPENSSL_init"
  69 #define DSO_mod_finish_name "OPENSSL_finish"
  70
  71 /*
  72  * This structure contains a data about supported modules. entries in this
  73  * table correspond to either dynamic or static modules.
  74  */
  75
  76 struct conf_module_st {
  77     /* DSO of this module or NULL if static */
  78     DSO *dso;
  79     /* Name of the module */
  80     char *name;
  81     /* Init function */
  82     conf_init_func *init;
  83     /* Finish function */
  84     conf_finish_func *finish;
  85     /* Number of successfully initialized modules */
  86     int links;
  87     void *usr_data;
  88 };
  89
  90 /*
  91  * This structure contains information about modules that have been
  92  * successfully initialized. There may be more than one entry for a given
  93  * module.
  94  */
  95
  96 struct conf_imodule_st {
  97     CONF_MODULE *pmod;
  98     char *name;
  99     char *value;
 100     unsigned long flags;
 101     void *usr_data;
 102 };
 103
 104 static STACK_OF(CONF_MODULE) *supported_modules = NULL;
 105 static STACK_OF(CONF_IMODULE) *initialized_modules = NULL;
 106
 107 static void module_free(CONF_MODULE *md);
 108 static void module_finish(CONF_IMODULE *imod);
 109 static int module_run(const CONF *cnf, char *name, char *value,
 110                       unsigned long flags);
 111 static CONF_MODULE *module_add(DSO *dso, const char *name,
 112                                conf_init_func *ifunc,
 113                                conf_finish_func *ffunc);
 114 static CONF_MODULE *module_find(char *name);
 115 static int module_init(CONF_MODULE *pmod, char *name, char *value,
 116                        const CONF *cnf);
 117 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value,
 118                                     unsigned long flags);
 119
 120 /* Main function: load modules from a CONF structure */
 121
 122 int CONF_modules_load(const CONF *cnf, const char *appname,
 123                       unsigned long flags)
 124 {
 125     STACK_OF(CONF_VALUE) *values;
 126     CONF_VALUE *vl;
 127     char *vsection = NULL;
 128
 129     int ret, i;
 130
 131     if (!cnf)
 132         return 1;
 133
 134     if (appname)
 135         vsection = NCONF_get_string(cnf, NULL, appname);
 136
 137     if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
 138         vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
 139
 140     if (!vsection) {
 141         ERR_clear_error();
 142         return 1;
 143     }
 144
 145     values = NCONF_get_section(cnf, vsection);
 146
 147     if (!values)
 148         return 0;
 149
 150     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 151         vl = sk_CONF_VALUE_value(values, i);
 152         ret = module_run(cnf, vl->name, vl->value, flags);
 153         if (ret <= 0)
 154             if (!(flags & CONF_MFLAGS_IGNORE_ERRORS))
 155                 return ret;
 156     }
 157
 158     return 1;
 159
 160 }
 161
 162 int CONF_modules_load_file(const char *filename, const char *appname,
 163                            unsigned long flags)
 164 {
 165     char *file = NULL;
 166     CONF *conf = NULL;
 167     int ret = 0;
 168     conf = NCONF_new(NULL);
 169     if (!conf)
 170         goto err;
 171
 172     if (filename == NULL) {
 173         file = CONF_get1_default_config_file();
 174         if (!file)
 175             goto err;
 176     } else
 177         file = (char *)filename;
 178
 179     if (NCONF_load(conf, file, NULL) <= 0) {
 180         if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
 181             (ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
 182             ERR_clear_error();
 183             ret = 1;
 184         }
 185         goto err;
 186     }
 187
 188     ret = CONF_modules_load(conf, appname, flags);
 189
 190  err:
 191     if (filename == NULL)
 192         OPENSSL_free(file);
 193     NCONF_free(conf);
 194
 195     return ret;
 196 }
 197
 198 static int module_run(const CONF *cnf, char *name, char *value,
 199                       unsigned long flags)
 200 {
 201     CONF_MODULE *md;
 202     int ret;
 203
 204     md = module_find(name);
 205
 206     /* Module not found: try to load DSO */
 207     if (!md && !(flags & CONF_MFLAGS_NO_DSO))
 208         md = module_load_dso(cnf, name, value, flags);
 209
 210     if (!md) {
 211         if (!(flags & CONF_MFLAGS_SILENT)) {
 212             CONFerr(CONF_F_MODULE_RUN, CONF_R_UNKNOWN_MODULE_NAME);
 213             ERR_add_error_data(2, "module=", name);
 214         }
 215         return -1;
 216     }
 217
 218     ret = module_init(md, name, value, cnf);
 219
 220     if (ret <= 0) {
 221         if (!(flags & CONF_MFLAGS_SILENT)) {
 222             char rcode[DECIMAL_SIZE(ret) + 1];
 223             CONFerr(CONF_F_MODULE_RUN, CONF_R_MODULE_INITIALIZATION_ERROR);
 224             BIO_snprintf(rcode, sizeof(rcode), "%-8d", ret);
 225             ERR_add_error_data(6, "module=", name, ", value=", value,
 226                                ", retcode=", rcode);
 227         }
 228     }
 229
 230     return ret;
 231 }
 232
 233 /* Load a module from a DSO */
 234 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value,
 235                                     unsigned long flags)
 236 {
 237     DSO *dso = NULL;
 238     conf_init_func *ifunc;
 239     conf_finish_func *ffunc;
 240     char *path = NULL;
 241     int errcode = 0;
 242     CONF_MODULE *md;
 243     /* Look for alternative path in module section */
 244     path = NCONF_get_string(cnf, value, "path");
 245     if (!path) {
 246         ERR_clear_error();
 247         path = name;
 248     }
 249     dso = DSO_load(NULL, path, NULL, 0);
 250     if (!dso) {
 251         errcode = CONF_R_ERROR_LOADING_DSO;
 252         goto err;
 253     }
 254     ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
 255     if (!ifunc) {
 256         errcode = CONF_R_MISSING_INIT_FUNCTION;
 257         goto err;
 258     }
 259     ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
 260     /* All OK, add module */
 261     md = module_add(dso, name, ifunc, ffunc);
 262
 263     if (!md)
 264         goto err;
 265
 266     return md;
 267
 268  err:
 269     if (dso)
 270         DSO_free(dso);
 271     CONFerr(CONF_F_MODULE_LOAD_DSO, errcode);
 272     ERR_add_error_data(4, "module=", name, ", path=", path);
 273     return NULL;
 274 }
 275
 276 /* add module to list */
 277 static CONF_MODULE *module_add(DSO *dso, const char *name,
 278                                conf_init_func *ifunc, conf_finish_func *ffunc)
 279 {
 280     CONF_MODULE *tmod = NULL;
 281     if (supported_modules == NULL)
 282         supported_modules = sk_CONF_MODULE_new_null();
 283     if (supported_modules == NULL)
 284         return NULL;
 285     tmod = OPENSSL_malloc(sizeof(CONF_MODULE));
 286     if (tmod == NULL)
 287         return NULL;
 288
 289     tmod->dso = dso;
 290     tmod->name = BUF_strdup(name);
 291     if (tmod->name == NULL) {
 292         OPENSSL_free(tmod);
 293         return NULL;
 294     }
 295     tmod->init = ifunc;
 296     tmod->finish = ffunc;
 297     tmod->links = 0;
 298
 299     if (!sk_CONF_MODULE_push(supported_modules, tmod)) {
 300         OPENSSL_free(tmod);
 301         return NULL;
 302     }
 303
 304     return tmod;
 305 }
 306
 307 /*
 308  * Find a module from the list. We allow module names of the form
 309  * modname.XXXX to just search for modname to allow the same module to be
 310  * initialized more than once.
 311  */
 312
 313 static CONF_MODULE *module_find(char *name)
 314 {
 315     CONF_MODULE *tmod;
 316     int i, nchar;
 317     char *p;
 318     p = strrchr(name, '.');
 319
 320     if (p)
 321         nchar = p - name;
 322     else
 323         nchar = strlen(name);
 324
 325     for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++) {
 326         tmod = sk_CONF_MODULE_value(supported_modules, i);
 327         if (!strncmp(tmod->name, name, nchar))
 328             return tmod;
 329     }
 330
 331     return NULL;
 332
 333 }
 334
 335 /* initialize a module */
 336 static int module_init(CONF_MODULE *pmod, char *name, char *value,
 337                        const CONF *cnf)
 338 {
 339     int ret = 1;
 340     int init_called = 0;
 341     CONF_IMODULE *imod = NULL;
 342
 343     /* Otherwise add initialized module to list */
 344     imod = OPENSSL_malloc(sizeof(CONF_IMODULE));
 345     if (!imod)
 346         goto err;
 347
 348     imod->pmod = pmod;
 349     imod->name = BUF_strdup(name);
 350     imod->value = BUF_strdup(value);
 351     imod->usr_data = NULL;
 352
 353     if (!imod->name || !imod->value)
 354         goto memerr;
 355
 356     /* Try to initialize module */
 357     if (pmod->init) {
 358         ret = pmod->init(imod, cnf);
 359         init_called = 1;
 360         /* Error occurred, exit */
 361         if (ret <= 0)
 362             goto err;
 363     }
 364
 365     if (initialized_modules == NULL) {
 366         initialized_modules = sk_CONF_IMODULE_new_null();
 367         if (!initialized_modules) {
 368             CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 369             goto err;
 370         }
 371     }
 372
 373     if (!sk_CONF_IMODULE_push(initialized_modules, imod)) {
 374         CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 375         goto err;
 376     }
 377
 378     pmod->links++;
 379
 380     return ret;
 381
 382  err:
 383
 384     /* We've started the module so we'd better finish it */
 385     if (pmod->finish && init_called)
 386         pmod->finish(imod);
 387
 388  memerr:
 389     if (imod) {
 390         if (imod->name)
 391             OPENSSL_free(imod->name);
 392         if (imod->value)
 393             OPENSSL_free(imod->value);
 394         OPENSSL_free(imod);
 395     }
 396
 397     return -1;
 398
 399 }
 400
 401 /*
 402  * Unload any dynamic modules that have a link count of zero: i.e. have no
 403  * active initialized modules. If 'all' is set then all modules are unloaded
 404  * including static ones.
 405  */
 406
 407 void CONF_modules_unload(int all)
 408 {
 409     int i;
 410     CONF_MODULE *md;
 411     CONF_modules_finish();
 412     /* unload modules in reverse order */
 413     for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--) {
 414         md = sk_CONF_MODULE_value(supported_modules, i);
 415         /* If static or in use and 'all' not set ignore it */
 416         if (((md->links > 0) || !md->dso) && !all)
 417             continue;
 418         /* Since we're working in reverse this is OK */
 419         (void)sk_CONF_MODULE_delete(supported_modules, i);
 420         module_free(md);
 421     }
 422     if (sk_CONF_MODULE_num(supported_modules) == 0) {
 423         sk_CONF_MODULE_free(supported_modules);
 424         supported_modules = NULL;
 425     }
 426 }
 427
 428 /* unload a single module */
 429 static void module_free(CONF_MODULE *md)
 430 {
 431     if (md->dso)
 432         DSO_free(md->dso);
 433     OPENSSL_free(md->name);
 434     OPENSSL_free(md);
 435 }
 436
 437 /* finish and free up all modules instances */
 438
 439 void CONF_modules_finish(void)
 440 {
 441     CONF_IMODULE *imod;
 442     while (sk_CONF_IMODULE_num(initialized_modules) > 0) {
 443         imod = sk_CONF_IMODULE_pop(initialized_modules);
 444         module_finish(imod);
 445     }
 446     sk_CONF_IMODULE_free(initialized_modules);
 447     initialized_modules = NULL;
 448 }
 449
 450 /* finish a module instance */
 451
 452 static void module_finish(CONF_IMODULE *imod)
 453 {
 454     if (imod->pmod->finish)
 455         imod->pmod->finish(imod);
 456     imod->pmod->links--;
 457     OPENSSL_free(imod->name);
 458     OPENSSL_free(imod->value);
 459     OPENSSL_free(imod);
 460 }
 461
 462 /* Add a static module to OpenSSL */
 463
 464 int CONF_module_add(const char *name, conf_init_func *ifunc,
 465                     conf_finish_func *ffunc)
 466 {
 467     if (module_add(NULL, name, ifunc, ffunc))
 468         return 1;
 469     else
 470         return 0;
 471 }
 472
 473 void CONF_modules_free(void)
 474 {
 475     CONF_modules_finish();
 476     CONF_modules_unload(1);
 477 }
 478
 479 /* Utility functions */
 480
 481 const char *CONF_imodule_get_name(const CONF_IMODULE *md)
 482 {
 483     return md->name;
 484 }
 485
 486 const char *CONF_imodule_get_value(const CONF_IMODULE *md)
 487 {
 488     return md->value;
 489 }
 490
 491 void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
 492 {
 493     return md->usr_data;
 494 }
 495
 496 void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
 497 {
 498     md->usr_data = usr_data;
 499 }
 500
 501 CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
 502 {
 503     return md->pmod;
 504 }
 505
 506 unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
 507 {
 508     return md->flags;
 509 }
 510
 511 void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
 512 {
 513     md->flags = flags;
 514 }
 515
 516 void *CONF_module_get_usr_data(CONF_MODULE *pmod)
 517 {
 518     return pmod->usr_data;
 519 }
 520
 521 void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
 522 {
 523     pmod->usr_data = usr_data;
 524 }
 525
 526 /* Return default config file name */
 527
 528 char *CONF_get1_default_config_file(void)
 529 {
 530     char *file;
 531     int len;
 532
 533     file = ossl_safe_getenv("OPENSSL_CONF");
 534     if (file)
 535         return BUF_strdup(file);
 536
 537     len = strlen(X509_get_default_cert_area());
 538 #ifndef OPENSSL_SYS_VMS
 539     len++;
 540 #endif
 541     len += strlen(OPENSSL_CONF);
 542
 543     file = OPENSSL_malloc(len + 1);
 544
 545     if (!file)
 546         return NULL;
 547     BUF_strlcpy(file, X509_get_default_cert_area(), len + 1);
 548 #ifndef OPENSSL_SYS_VMS
 549     BUF_strlcat(file, "/", len + 1);
 550 #endif
 551     BUF_strlcat(file, OPENSSL_CONF, len + 1);
 552
 553     return file;
 554 }
 555
 556 /*
 557  * This function takes a list separated by 'sep' and calls the callback
 558  * function giving the start and length of each member optionally stripping
 559  * leading and trailing whitespace. This can be used to parse comma separated
 560  * lists for example.
 561  */
 562
 563 int CONF_parse_list(const char *list_, int sep, int nospc,
 564                     int (*list_cb) (const char *elem, int len, void *usr),
 565                     void *arg)
 566 {
 567     int ret;
 568     const char *lstart, *tmpend, *p;
 569
 570     if (list_ == NULL) {
 571         CONFerr(CONF_F_CONF_PARSE_LIST, CONF_R_LIST_CANNOT_BE_NULL);
 572         return 0;
 573     }
 574
 575     lstart = list_;
 576     for (;;) {
 577         if (nospc) {
 578             while (*lstart && isspace((unsigned char)*lstart))
 579                 lstart++;
 580         }
 581         p = strchr(lstart, sep);
 582         if (p == lstart || !*lstart)
 583             ret = list_cb(NULL, 0, arg);
 584         else {
 585             if (p)
 586                 tmpend = p - 1;
 587             else
 588                 tmpend = lstart + strlen(lstart) - 1;
 589             if (nospc) {
 590                 while (isspace((unsigned char)*tmpend))
 591                     tmpend--;
 592             }
 593             ret = list_cb(lstart, tmpend - lstart + 1, arg);
 594         }
 595         if (ret <= 0)
 596             return ret;
 597         if (p == NULL)
 598             return 1;
 599         lstart = p + 1;
 600     }
 601 }