crypto/conf/conf_mod.c

   1 /*
   2  * Written by Stephen Henson (steve@openssl.org) for the OpenSSL project
   3  * 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 <stdio.h>
  60 #include <ctype.h>
  61 #include <openssl/crypto.h>
  62 #include "internal/cryptlib.h"
  63 #include "internal/conf.h"
  64 #include "internal/dso.h"
  65 #include <openssl/x509.h>
  66
  67 #define DSO_mod_init_name "OPENSSL_init"
  68 #define DSO_mod_finish_name "OPENSSL_finish"
  69
  70 /*
  71  * This structure contains a data about supported modules. entries in this
  72  * table correspond to either dynamic or static modules.
  73  */
  74
  75 struct conf_module_st {
  76     /* DSO of this module or NULL if static */
  77     DSO *dso;
  78     /* Name of the module */
  79     char *name;
  80     /* Init function */
  81     conf_init_func *init;
  82     /* Finish function */
  83     conf_finish_func *finish;
  84     /* Number of successfully initialized modules */
  85     int links;
  86     void *usr_data;
  87 };
  88
  89 /*
  90  * This structure contains information about modules that have been
  91  * successfully initialized. There may be more than one entry for a given
  92  * module.
  93  */
  94
  95 struct conf_imodule_st {
  96     CONF_MODULE *pmod;
  97     char *name;
  98     char *value;
  99     unsigned long flags;
 100     void *usr_data;
 101 };
 102
 103 static STACK_OF(CONF_MODULE) *supported_modules = NULL;
 104 static STACK_OF(CONF_IMODULE) *initialized_modules = NULL;
 105
 106 static void module_free(CONF_MODULE *md);
 107 static void module_finish(CONF_IMODULE *imod);
 108 static int module_run(const CONF *cnf, char *name, char *value,
 109                       unsigned long flags);
 110 static CONF_MODULE *module_add(DSO *dso, const char *name,
 111                                conf_init_func *ifunc,
 112                                conf_finish_func *ffunc);
 113 static CONF_MODULE *module_find(char *name);
 114 static int module_init(CONF_MODULE *pmod, char *name, char *value,
 115                        const CONF *cnf);
 116 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value);
 117
 118 /* Main function: load modules from a CONF structure */
 119
 120 int CONF_modules_load(const CONF *cnf, const char *appname,
 121                       unsigned long flags)
 122 {
 123     STACK_OF(CONF_VALUE) *values;
 124     CONF_VALUE *vl;
 125     char *vsection = NULL;
 126
 127     int ret, i;
 128
 129     if (!cnf)
 130         return 1;
 131
 132     if (appname)
 133         vsection = NCONF_get_string(cnf, NULL, appname);
 134
 135     if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
 136         vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
 137
 138     if (!vsection) {
 139         ERR_clear_error();
 140         return 1;
 141     }
 142
 143     values = NCONF_get_section(cnf, vsection);
 144
 145     if (!values)
 146         return 0;
 147
 148     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 149         vl = sk_CONF_VALUE_value(values, i);
 150         ret = module_run(cnf, vl->name, vl->value, flags);
 151         if (ret <= 0)
 152             if (!(flags & CONF_MFLAGS_IGNORE_ERRORS))
 153                 return ret;
 154     }
 155
 156     return 1;
 157
 158 }
 159
 160 int CONF_modules_load_file(const char *filename, const char *appname,
 161                            unsigned long flags)
 162 {
 163     char *file = NULL;
 164     CONF *conf = NULL;
 165     int ret = 0;
 166     conf = NCONF_new(NULL);
 167     if (conf == NULL)
 168         goto err;
 169
 170     if (filename == NULL) {
 171         file = CONF_get1_default_config_file();
 172         if (!file)
 173             goto err;
 174     } else
 175         file = (char *)filename;
 176
 177     if (NCONF_load(conf, file, NULL) <= 0) {
 178         if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
 179             (ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
 180             ERR_clear_error();
 181             ret = 1;
 182         }
 183         goto err;
 184     }
 185
 186     ret = CONF_modules_load(conf, appname, flags);
 187
 188  err:
 189     if (filename == NULL)
 190         OPENSSL_free(file);
 191     NCONF_free(conf);
 192
 193     return ret;
 194 }
 195
 196 static int module_run(const CONF *cnf, char *name, char *value,
 197                       unsigned long flags)
 198 {
 199     CONF_MODULE *md;
 200     int ret;
 201
 202     md = module_find(name);
 203
 204     /* Module not found: try to load DSO */
 205     if (!md && !(flags & CONF_MFLAGS_NO_DSO))
 206         md = module_load_dso(cnf, name, value);
 207
 208     if (!md) {
 209         if (!(flags & CONF_MFLAGS_SILENT)) {
 210             CONFerr(CONF_F_MODULE_RUN, CONF_R_UNKNOWN_MODULE_NAME);
 211             ERR_add_error_data(2, "module=", name);
 212         }
 213         return -1;
 214     }
 215
 216     ret = module_init(md, name, value, cnf);
 217
 218     if (ret <= 0) {
 219         if (!(flags & CONF_MFLAGS_SILENT)) {
 220             char rcode[DECIMAL_SIZE(ret) + 1];
 221             CONFerr(CONF_F_MODULE_RUN, CONF_R_MODULE_INITIALIZATION_ERROR);
 222             BIO_snprintf(rcode, sizeof rcode, "%-8d", ret);
 223             ERR_add_error_data(6, "module=", name, ", value=", value,
 224                                ", retcode=", rcode);
 225         }
 226     }
 227
 228     return ret;
 229 }
 230
 231 /* Load a module from a DSO */
 232 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value)
 233 {
 234     DSO *dso = NULL;
 235     conf_init_func *ifunc;
 236     conf_finish_func *ffunc;
 237     char *path = NULL;
 238     int errcode = 0;
 239     CONF_MODULE *md;
 240     /* Look for alternative path in module section */
 241     path = NCONF_get_string(cnf, value, "path");
 242     if (!path) {
 243         ERR_clear_error();
 244         path = name;
 245     }
 246     dso = DSO_load(NULL, path, NULL, 0);
 247     if (!dso) {
 248         errcode = CONF_R_ERROR_LOADING_DSO;
 249         goto err;
 250     }
 251     ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
 252     if (!ifunc) {
 253         errcode = CONF_R_MISSING_INIT_FUNCTION;
 254         goto err;
 255     }
 256     ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
 257     /* All OK, add module */
 258     md = module_add(dso, name, ifunc, ffunc);
 259
 260     if (!md)
 261         goto err;
 262
 263     return md;
 264
 265  err:
 266     DSO_free(dso);
 267     CONFerr(CONF_F_MODULE_LOAD_DSO, errcode);
 268     ERR_add_error_data(4, "module=", name, ", path=", path);
 269     return NULL;
 270 }
 271
 272 /* add module to list */
 273 static CONF_MODULE *module_add(DSO *dso, const char *name,
 274                                conf_init_func *ifunc, conf_finish_func *ffunc)
 275 {
 276     CONF_MODULE *tmod = NULL;
 277     if (supported_modules == NULL)
 278         supported_modules = sk_CONF_MODULE_new_null();
 279     if (supported_modules == NULL)
 280         return NULL;
 281     tmod = OPENSSL_zalloc(sizeof(*tmod));
 282     if (tmod == NULL)
 283         return NULL;
 284
 285     tmod->dso = dso;
 286     tmod->name = OPENSSL_strdup(name);
 287     tmod->init = ifunc;
 288     tmod->finish = ffunc;
 289
 290     if (!sk_CONF_MODULE_push(supported_modules, tmod)) {
 291         OPENSSL_free(tmod);
 292         return NULL;
 293     }
 294
 295     return tmod;
 296 }
 297
 298 /*
 299  * Find a module from the list. We allow module names of the form
 300  * modname.XXXX to just search for modname to allow the same module to be
 301  * initialized more than once.
 302  */
 303
 304 static CONF_MODULE *module_find(char *name)
 305 {
 306     CONF_MODULE *tmod;
 307     int i, nchar;
 308     char *p;
 309     p = strrchr(name, '.');
 310
 311     if (p)
 312         nchar = p - name;
 313     else
 314         nchar = strlen(name);
 315
 316     for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++) {
 317         tmod = sk_CONF_MODULE_value(supported_modules, i);
 318         if (strncmp(tmod->name, name, nchar) == 0)
 319             return tmod;
 320     }
 321
 322     return NULL;
 323
 324 }
 325
 326 /* initialize a module */
 327 static int module_init(CONF_MODULE *pmod, char *name, char *value,
 328                        const CONF *cnf)
 329 {
 330     int ret = 1;
 331     int init_called = 0;
 332     CONF_IMODULE *imod = NULL;
 333
 334     /* Otherwise add initialized module to list */
 335     imod = OPENSSL_malloc(sizeof(*imod));
 336     if (imod == NULL)
 337         goto err;
 338
 339     imod->pmod = pmod;
 340     imod->name = OPENSSL_strdup(name);
 341     imod->value = OPENSSL_strdup(value);
 342     imod->usr_data = NULL;
 343
 344     if (!imod->name || !imod->value)
 345         goto memerr;
 346
 347     /* Try to initialize module */
 348     if (pmod->init) {
 349         ret = pmod->init(imod, cnf);
 350         init_called = 1;
 351         /* Error occurred, exit */
 352         if (ret <= 0)
 353             goto err;
 354     }
 355
 356     if (initialized_modules == NULL) {
 357         initialized_modules = sk_CONF_IMODULE_new_null();
 358         if (!initialized_modules) {
 359             CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 360             goto err;
 361         }
 362     }
 363
 364     if (!sk_CONF_IMODULE_push(initialized_modules, imod)) {
 365         CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 366         goto err;
 367     }
 368
 369     pmod->links++;
 370
 371     return ret;
 372
 373  err:
 374
 375     /* We've started the module so we'd better finish it */
 376     if (pmod->finish && init_called)
 377         pmod->finish(imod);
 378
 379  memerr:
 380     if (imod) {
 381         OPENSSL_free(imod->name);
 382         OPENSSL_free(imod->value);
 383         OPENSSL_free(imod);
 384     }
 385
 386     return -1;
 387
 388 }
 389
 390 /*
 391  * Unload any dynamic modules that have a link count of zero: i.e. have no
 392  * active initialized modules. If 'all' is set then all modules are unloaded
 393  * including static ones.
 394  */
 395
 396 void CONF_modules_unload(int all)
 397 {
 398     int i;
 399     CONF_MODULE *md;
 400     CONF_modules_finish();
 401     /* unload modules in reverse order */
 402     for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--) {
 403         md = sk_CONF_MODULE_value(supported_modules, i);
 404         /* If static or in use and 'all' not set ignore it */
 405         if (((md->links > 0) || !md->dso) && !all)
 406             continue;
 407         /* Since we're working in reverse this is OK */
 408         (void)sk_CONF_MODULE_delete(supported_modules, i);
 409         module_free(md);
 410     }
 411     if (sk_CONF_MODULE_num(supported_modules) == 0) {
 412         sk_CONF_MODULE_free(supported_modules);
 413         supported_modules = NULL;
 414     }
 415 }
 416
 417 /* unload a single module */
 418 static void module_free(CONF_MODULE *md)
 419 {
 420     DSO_free(md->dso);
 421     OPENSSL_free(md->name);
 422     OPENSSL_free(md);
 423 }
 424
 425 /* finish and free up all modules instances */
 426
 427 void CONF_modules_finish(void)
 428 {
 429     CONF_IMODULE *imod;
 430     while (sk_CONF_IMODULE_num(initialized_modules) > 0) {
 431         imod = sk_CONF_IMODULE_pop(initialized_modules);
 432         module_finish(imod);
 433     }
 434     sk_CONF_IMODULE_free(initialized_modules);
 435     initialized_modules = NULL;
 436 }
 437
 438 /* finish a module instance */
 439
 440 static void module_finish(CONF_IMODULE *imod)
 441 {
 442     if (!imod)
 443         return;
 444     if (imod->pmod->finish)
 445         imod->pmod->finish(imod);
 446     imod->pmod->links--;
 447     OPENSSL_free(imod->name);
 448     OPENSSL_free(imod->value);
 449     OPENSSL_free(imod);
 450 }
 451
 452 /* Add a static module to OpenSSL */
 453
 454 int CONF_module_add(const char *name, conf_init_func *ifunc,
 455                     conf_finish_func *ffunc)
 456 {
 457     if (module_add(NULL, name, ifunc, ffunc))
 458         return 1;
 459     else
 460         return 0;
 461 }
 462
 463 void conf_modules_free_intern(void)
 464 {
 465     CONF_modules_finish();
 466     CONF_modules_unload(1);
 467 }
 468
 469 /* Utility functions */
 470
 471 const char *CONF_imodule_get_name(const CONF_IMODULE *md)
 472 {
 473     return md->name;
 474 }
 475
 476 const char *CONF_imodule_get_value(const CONF_IMODULE *md)
 477 {
 478     return md->value;
 479 }
 480
 481 void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
 482 {
 483     return md->usr_data;
 484 }
 485
 486 void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
 487 {
 488     md->usr_data = usr_data;
 489 }
 490
 491 CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
 492 {
 493     return md->pmod;
 494 }
 495
 496 unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
 497 {
 498     return md->flags;
 499 }
 500
 501 void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
 502 {
 503     md->flags = flags;
 504 }
 505
 506 void *CONF_module_get_usr_data(CONF_MODULE *pmod)
 507 {
 508     return pmod->usr_data;
 509 }
 510
 511 void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
 512 {
 513     pmod->usr_data = usr_data;
 514 }
 515
 516 /* Return default config file name */
 517
 518 char *CONF_get1_default_config_file(void)
 519 {
 520     char *file;
 521     int len;
 522
 523     file = getenv("OPENSSL_CONF");
 524     if (file)
 525         return OPENSSL_strdup(file);
 526
 527     len = strlen(X509_get_default_cert_area());
 528 #ifndef OPENSSL_SYS_VMS
 529     len++;
 530 #endif
 531     len += strlen(OPENSSL_CONF);
 532
 533     file = OPENSSL_malloc(len + 1);
 534
 535     if (file == NULL)
 536         return NULL;
 537     OPENSSL_strlcpy(file, X509_get_default_cert_area(), len + 1);
 538 #ifndef OPENSSL_SYS_VMS
 539     OPENSSL_strlcat(file, "/", len + 1);
 540 #endif
 541     OPENSSL_strlcat(file, OPENSSL_CONF, len + 1);
 542
 543     return file;
 544 }
 545
 546 /*
 547  * This function takes a list separated by 'sep' and calls the callback
 548  * function giving the start and length of each member optionally stripping
 549  * leading and trailing whitespace. This can be used to parse comma separated
 550  * lists for example.
 551  */
 552
 553 int CONF_parse_list(const char *list_, int sep, int nospc,
 554                     int (*list_cb) (const char *elem, int len, void *usr),
 555                     void *arg)
 556 {
 557     int ret;
 558     const char *lstart, *tmpend, *p;
 559
 560     if (list_ == NULL) {
 561         CONFerr(CONF_F_CONF_PARSE_LIST, CONF_R_LIST_CANNOT_BE_NULL);
 562         return 0;
 563     }
 564
 565     lstart = list_;
 566     for (;;) {
 567         if (nospc) {
 568             while (*lstart && isspace((unsigned char)*lstart))
 569                 lstart++;
 570         }
 571         p = strchr(lstart, sep);
 572         if (p == lstart || !*lstart)
 573             ret = list_cb(NULL, 0, arg);
 574         else {
 575             if (p)
 576                 tmpend = p - 1;
 577             else
 578                 tmpend = lstart + strlen(lstart) - 1;
 579             if (nospc) {
 580                 while (isspace((unsigned char)*tmpend))
 581                     tmpend--;
 582             }
 583             ret = list_cb(lstart, tmpend - lstart + 1, arg);
 584         }
 585         if (ret <= 0)
 586             return ret;
 587         if (p == NULL)
 588             return 1;
 589         lstart = p + 1;
 590     }
 591 }