crypto/openssl-0.9.7d/crypto/conf/conf_mod.c

   1 /* conf_mod.c */
   2 /* Written by Stephen Henson (shenson@bigfoot.com) 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 <stdio.h>
  60 #include <ctype.h>
  61 #include <openssl/crypto.h>
  62 #include "cryptlib.h"
  63 #include <openssl/conf.h>
  64 #include <openssl/dso.h>
  65 #include <openssl/x509.h>
  66
  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.
  73  * entries in this table correspond to either dynamic or
  74  * static modules.
  75  */
  76
  77 struct conf_module_st
  78         {
  79         /* DSO of this module or NULL if static */
  80         DSO *dso;
  81         /* Name of the module */
  82         char *name;
  83         /* Init function */
  84         conf_init_func *init;
  85         /* Finish function */
  86         conf_finish_func *finish;
  87         /* Number of successfully initialized modules */
  88         int links;
  89         void *usr_data;
  90         };
  91
  92
  93 /* This structure contains information about modules that have been
  94  * successfully initialized. There may be more than one entry for a
  95  * given module.
  96  */
  97
  98 struct conf_imodule_st
  99         {
 100         CONF_MODULE *pmod;
 101         char *name;
 102         char *value;
 103         unsigned long flags;
 104         void *usr_data;
 105         };
 106
 107 static STACK_OF(CONF_MODULE) *supported_modules = NULL;
 108 static STACK_OF(CONF_IMODULE) *initialized_modules = NULL;
 109
 110 static void module_free(CONF_MODULE *md);
 111 static void module_finish(CONF_IMODULE *imod);
 112 static int module_run(const CONF *cnf, char *name, char *value,
 113                                           unsigned long flags);
 114 static CONF_MODULE *module_add(DSO *dso, const char *name,
 115                         conf_init_func *ifunc, conf_finish_func *ffunc);
 116 static CONF_MODULE *module_find(char *name);
 117 static int module_init(CONF_MODULE *pmod, char *name, char *value,
 118                                            const CONF *cnf);
 119 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value,
 120                                                                         unsigned long flags);
 121
 122 /* Main function: load modules from a CONF structure */
 123
 124 int CONF_modules_load(const CONF *cnf, const char *appname,
 125                       unsigned long flags)
 126         {
 127         STACK_OF(CONF_VALUE) *values;
 128         CONF_VALUE *vl;
 129         char *vsection;
 130
 131         int ret, i;
 132
 133         if (!cnf)
 134                 return 1;
 135
 136         if (appname == NULL)
 137                 appname = "openssl_conf";
 138
 139         vsection = NCONF_get_string(cnf, NULL, appname);
 140
 141         if (!vsection)
 142                 {
 143                 ERR_clear_error();
 144                 return 1;
 145                 }
 146
 147         values = NCONF_get_section(cnf, vsection);
 148
 149         if (!values)
 150                 return 0;
 151
 152         for (i = 0; i < sk_CONF_VALUE_num(values); i++)
 153                 {
 154                 vl = sk_CONF_VALUE_value(values, i);
 155                 ret = module_run(cnf, vl->name, vl->value, flags);
 156                 if (ret <= 0)
 157                         if(!(flags & CONF_MFLAGS_IGNORE_ERRORS))
 158                                 return ret;
 159                 }
 160
 161         return 1;
 162
 163         }
 164
 165 int CONF_modules_load_file(const char *filename, const char *appname,
 166                            unsigned long flags)
 167         {
 168         char *file = NULL;
 169         CONF *conf = NULL;
 170         int ret = 0;
 171         conf = NCONF_new(NULL);
 172         if (!conf)
 173                 goto err;
 174
 175         if (filename == NULL)
 176                 {
 177                 file = CONF_get1_default_config_file();
 178                 if (!file)
 179                         goto err;
 180                 }
 181         else
 182                 file = (char *)filename;
 183
 184         if (NCONF_load(conf, file, NULL) <= 0)
 185                 {
 186                 if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
 187                   (ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE))
 188                         {
 189                         ERR_clear_error();
 190                         ret = 1;
 191                         }
 192                 goto err;
 193                 }
 194
 195         ret = CONF_modules_load(conf, appname, flags);
 196
 197         err:
 198         if (filename == NULL)
 199                 OPENSSL_free(file);
 200         NCONF_free(conf);
 201
 202         return ret;
 203         }
 204
 205 static int module_run(const CONF *cnf, char *name, char *value,
 206                       unsigned long flags)
 207         {
 208         CONF_MODULE *md;
 209         int ret;
 210
 211         md = module_find(name);
 212
 213         /* Module not found: try to load DSO */
 214         if (!md && !(flags & CONF_MFLAGS_NO_DSO))
 215                 md = module_load_dso(cnf, name, value, flags);
 216
 217         if (!md)
 218                 {
 219                 if (!(flags & CONF_MFLAGS_SILENT))
 220                         {
 221                         CONFerr(CONF_F_MODULE_RUN, CONF_R_UNKNOWN_MODULE_NAME);
 222                         ERR_add_error_data(2, "module=", name);
 223                         }
 224                 return -1;
 225                 }
 226
 227         ret = module_init(md, name, value, cnf);
 228
 229         if (ret <= 0)
 230                 {
 231                 if (!(flags & CONF_MFLAGS_SILENT))
 232                         {
 233                         char rcode[DECIMAL_SIZE(ret)+1];
 234                         CONFerr(CONF_F_CONF_MODULES_LOAD, CONF_R_MODULE_INITIALIZATION_ERROR);
 235                         BIO_snprintf(rcode, sizeof rcode, "%-8d", ret);
 236                         ERR_add_error_data(6, "module=", name, ", value=", value, ", retcode=", rcode);
 237                         }
 238                 }
 239
 240         return ret;
 241         }
 242
 243 /* Load a module from a DSO */
 244 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value,
 245                                     unsigned long flags)
 246         {
 247         DSO *dso = NULL;
 248         conf_init_func *ifunc;
 249         conf_finish_func *ffunc;
 250         char *path = NULL;
 251         int errcode = 0;
 252         CONF_MODULE *md;
 253         /* Look for alternative path in module section */
 254         path = NCONF_get_string(cnf, value, "path");
 255         if (!path)
 256                 {
 257                 ERR_get_error();
 258                 path = name;
 259                 }
 260         dso = DSO_load(NULL, path, NULL, 0);
 261         if (!dso)
 262                 {
 263                 errcode = CONF_R_ERROR_LOADING_DSO;
 264                 goto err;
 265                 }
 266         ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
 267         if (!ifunc)
 268                 {
 269                 errcode = CONF_R_MISSING_INIT_FUNCTION;
 270                 goto err;
 271                 }
 272         ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
 273         /* All OK, add module */
 274         md = module_add(dso, name, ifunc, ffunc);
 275
 276         if (!md)
 277                 goto err;
 278
 279         return md;
 280
 281         err:
 282         if (dso)
 283                 DSO_free(dso);
 284         CONFerr(CONF_F_MODULE_LOAD_DSO, errcode);
 285         ERR_add_error_data(4, "module=", name, ", path=", path);
 286         return NULL;
 287         }
 288
 289 /* add module to list */
 290 static CONF_MODULE *module_add(DSO *dso, const char *name,
 291                                conf_init_func *ifunc, conf_finish_func *ffunc)
 292         {
 293         CONF_MODULE *tmod = NULL;
 294         if (supported_modules == NULL)
 295                 supported_modules = sk_CONF_MODULE_new_null();
 296         if (supported_modules == NULL)
 297                 return NULL;
 298         tmod = OPENSSL_malloc(sizeof(CONF_MODULE));
 299         if (tmod == NULL)
 300                 return NULL;
 301
 302         tmod->dso = dso;
 303         tmod->name = BUF_strdup(name);
 304         tmod->init = ifunc;
 305         tmod->finish = ffunc;
 306         tmod->links = 0;
 307
 308         if (!sk_CONF_MODULE_push(supported_modules, tmod))
 309                 {
 310                 OPENSSL_free(tmod);
 311                 return NULL;
 312                 }
 313
 314         return tmod;
 315         }
 316
 317 /* Find a module from the list. We allow module names of the
 318  * form modname.XXXX to just search for modname to allow the
 319  * same module to be initialized more than once.
 320  */
 321
 322 static CONF_MODULE *module_find(char *name)
 323         {
 324         CONF_MODULE *tmod;
 325         int i, nchar;
 326         char *p;
 327         p = strrchr(name, '.');
 328
 329         if (p)
 330                 nchar = p - name;
 331         else
 332                 nchar = strlen(name);
 333
 334         for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++)
 335                 {
 336                 tmod = sk_CONF_MODULE_value(supported_modules, i);
 337                 if (!strncmp(tmod->name, name, nchar))
 338                         return tmod;
 339                 }
 340
 341         return NULL;
 342
 343         }
 344
 345 /* initialize a module */
 346 static int module_init(CONF_MODULE *pmod, char *name, char *value,
 347                        const CONF *cnf)
 348         {
 349         int ret = 1;
 350         int init_called = 0;
 351         CONF_IMODULE *imod = NULL;
 352
 353         /* Otherwise add initialized module to list */
 354         imod = OPENSSL_malloc(sizeof(CONF_IMODULE));
 355         if (!imod)
 356                 goto err;
 357
 358         imod->pmod = pmod;
 359         imod->name = BUF_strdup(name);
 360         imod->value = BUF_strdup(value);
 361         imod->usr_data = NULL;
 362
 363         if (!imod->name || !imod->value)
 364                 goto memerr;
 365
 366         /* Try to initialize module */
 367         if(pmod->init)
 368                 {
 369                 ret = pmod->init(imod, cnf);
 370                 init_called = 1;
 371                 /* Error occurred, exit */
 372                 if (ret <= 0)
 373                         goto err;
 374                 }
 375
 376         if (initialized_modules == NULL)
 377                 {
 378                 initialized_modules = sk_CONF_IMODULE_new_null();
 379                 if (!initialized_modules)
 380                         {
 381                         CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 382                         goto err;
 383                         }
 384                 }
 385
 386         if (!sk_CONF_IMODULE_push(initialized_modules, imod))
 387                 {
 388                 CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 389                 goto err;
 390                 }
 391
 392         pmod->links++;
 393
 394         return ret;
 395
 396         err:
 397
 398         /* We've started the module so we'd better finish it */
 399         if (pmod->finish && init_called)
 400                 pmod->finish(imod);
 401
 402         memerr:
 403         if (imod)
 404                 {
 405                 if (imod->name)
 406                         OPENSSL_free(imod->name);
 407                 if (imod->value)
 408                         OPENSSL_free(imod->value);
 409                 OPENSSL_free(imod);
 410                 }
 411
 412         return -1;
 413
 414         }
 415
 416 /* Unload any dynamic modules that have a link count of zero:
 417  * i.e. have no active initialized modules. If 'all' is set
 418  * then all modules are unloaded including static ones.
 419  */
 420
 421 void CONF_modules_unload(int all)
 422         {
 423         int i;
 424         CONF_MODULE *md;
 425         CONF_modules_finish();
 426         /* unload modules in reverse order */
 427         for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--)
 428                 {
 429                 md = sk_CONF_MODULE_value(supported_modules, i);
 430                 /* If static or in use and 'all' not set ignore it */
 431                 if (((md->links > 0) || !md->dso) && !all)
 432                         continue;
 433                 /* Since we're working in reverse this is OK */
 434                 sk_CONF_MODULE_delete(supported_modules, i);
 435                 module_free(md);
 436                 }
 437         if (sk_CONF_MODULE_num(supported_modules) == 0)
 438                 {
 439                 sk_CONF_MODULE_free(supported_modules);
 440                 supported_modules = NULL;
 441                 }
 442         }
 443
 444 /* unload a single module */
 445 static void module_free(CONF_MODULE *md)
 446         {
 447         if (md->dso)
 448                 DSO_free(md->dso);
 449         OPENSSL_free(md->name);
 450         OPENSSL_free(md);
 451         }
 452
 453 /* finish and free up all modules instances */
 454
 455 void CONF_modules_finish(void)
 456         {
 457         CONF_IMODULE *imod;
 458         while (sk_CONF_IMODULE_num(initialized_modules) > 0)
 459                 {
 460                 imod = sk_CONF_IMODULE_pop(initialized_modules);
 461                 module_finish(imod);
 462                 }
 463         sk_CONF_IMODULE_free(initialized_modules);
 464         initialized_modules = NULL;
 465         }
 466
 467 /* finish a module instance */
 468
 469 static void module_finish(CONF_IMODULE *imod)
 470         {
 471         if (imod->pmod->finish)
 472                 imod->pmod->finish(imod);
 473         imod->pmod->links--;
 474         OPENSSL_free(imod->name);
 475         OPENSSL_free(imod->value);
 476         OPENSSL_free(imod);
 477         }
 478
 479 /* Add a static module to OpenSSL */
 480
 481 int CONF_module_add(const char *name, conf_init_func *ifunc,
 482                     conf_finish_func *ffunc)
 483         {
 484         if (module_add(NULL, name, ifunc, ffunc))
 485                 return 1;
 486         else
 487                 return 0;
 488         }
 489
 490 void CONF_modules_free(void)
 491         {
 492         CONF_modules_finish();
 493         CONF_modules_unload(1);
 494         }
 495
 496 /* Utility functions */
 497
 498 const char *CONF_imodule_get_name(const CONF_IMODULE *md)
 499         {
 500         return md->name;
 501         }
 502
 503 const char *CONF_imodule_get_value(const CONF_IMODULE *md)
 504         {
 505         return md->value;
 506         }
 507
 508 void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
 509         {
 510         return md->usr_data;
 511         }
 512
 513 void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
 514         {
 515         md->usr_data = usr_data;
 516         }
 517
 518 CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
 519         {
 520         return md->pmod;
 521         }
 522
 523 unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
 524         {
 525         return md->flags;
 526         }
 527
 528 void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
 529         {
 530         md->flags = flags;
 531         }
 532
 533 void *CONF_module_get_usr_data(CONF_MODULE *pmod)
 534         {
 535         return pmod->usr_data;
 536         }
 537
 538 void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
 539         {
 540         pmod->usr_data = usr_data;
 541         }
 542
 543 /* Return default config file name */
 544
 545 char *CONF_get1_default_config_file(void)
 546         {
 547         char *file;
 548         int len;
 549
 550         file = getenv("OPENSSL_CONF");
 551         if (file)
 552                 return BUF_strdup(file);
 553
 554         len = strlen(X509_get_default_cert_area());
 555 #ifndef OPENSSL_SYS_VMS
 556         len++;
 557 #endif
 558         len += strlen(OPENSSL_CONF);
 559
 560         file = OPENSSL_malloc(len + 1);
 561
 562         if (!file)
 563                 return NULL;
 564         BUF_strlcpy(file,X509_get_default_cert_area(),len + 1);
 565 #ifndef OPENSSL_SYS_VMS
 566         BUF_strlcat(file,"/",len + 1);
 567 #endif
 568         BUF_strlcat(file,OPENSSL_CONF,len + 1);
 569
 570         return file;
 571         }
 572
 573 /* This function takes a list separated by 'sep' and calls the
 574  * callback function giving the start and length of each member
 575  * optionally stripping leading and trailing whitespace. This can
 576  * be used to parse comma separated lists for example.
 577  */
 578
 579 int CONF_parse_list(const char *list_, int sep, int nospc,
 580         int (*list_cb)(const char *elem, int len, void *usr), void *arg)
 581         {
 582         int ret;
 583         const char *lstart, *tmpend, *p;
 584         lstart = list_;
 585
 586         for(;;)
 587                 {
 588                 if (nospc)
 589                         {
 590                         while(*lstart && isspace((unsigned char)*lstart))
 591                                 lstart++;
 592                         }
 593                 p = strchr(lstart, sep);
 594                 if (p == lstart || !*lstart)
 595                         ret = list_cb(NULL, 0, arg);
 596                 else
 597                         {
 598                         if (p)
 599                                 tmpend = p - 1;
 600                         else
 601                                 tmpend = lstart + strlen(lstart) - 1;
 602                         if (nospc)
 603                                 {
 604                                 while(isspace((unsigned char)*tmpend))
 605                                         tmpend--;
 606                                 }
 607                         ret = list_cb(lstart, tmpend - lstart + 1, arg);
 608                         }
 609                 if (ret <= 0)
 610                         return ret;
 611                 if (p == NULL)
 612                         return 1;
 613                 lstart = p + 1;
 614                 }
 615         }
 616