crypto/conf/conf_mod.c

   1 /*
   2  * Copyright 2002-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 #include "internal/cryptlib.h"
  11 #include <stdio.h>
  12 #include <ctype.h>
  13 #include <openssl/crypto.h>
  14 #include "internal/conf.h"
  15 #include "internal/dso.h"
  16 #include <openssl/x509.h>
  17
  18 #define DSO_mod_init_name "OPENSSL_init"
  19 #define DSO_mod_finish_name "OPENSSL_finish"
  20
  21 /*
  22  * This structure contains a data about supported modules. entries in this
  23  * table correspond to either dynamic or static modules.
  24  */
  25
  26 struct conf_module_st {
  27     /* DSO of this module or NULL if static */
  28     DSO *dso;
  29     /* Name of the module */
  30     char *name;
  31     /* Init function */
  32     conf_init_func *init;
  33     /* Finish function */
  34     conf_finish_func *finish;
  35     /* Number of successfully initialized modules */
  36     int links;
  37     void *usr_data;
  38 };
  39
  40 /*
  41  * This structure contains information about modules that have been
  42  * successfully initialized. There may be more than one entry for a given
  43  * module.
  44  */
  45
  46 struct conf_imodule_st {
  47     CONF_MODULE *pmod;
  48     char *name;
  49     char *value;
  50     unsigned long flags;
  51     void *usr_data;
  52 };
  53
  54 static STACK_OF(CONF_MODULE) *supported_modules = NULL;
  55 static STACK_OF(CONF_IMODULE) *initialized_modules = NULL;
  56
  57 static void module_free(CONF_MODULE *md);
  58 static void module_finish(CONF_IMODULE *imod);
  59 static int module_run(const CONF *cnf, const char *name, const char *value,
  60                       unsigned long flags);
  61 static CONF_MODULE *module_add(DSO *dso, const char *name,
  62                                conf_init_func *ifunc,
  63                                conf_finish_func *ffunc);
  64 static CONF_MODULE *module_find(const char *name);
  65 static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
  66                        const CONF *cnf);
  67 static CONF_MODULE *module_load_dso(const CONF *cnf, const char *name,
  68                                     const char *value);
  69
  70 /* Main function: load modules from a CONF structure */
  71
  72 int CONF_modules_load(const CONF *cnf, const char *appname,
  73                       unsigned long flags)
  74 {
  75     STACK_OF(CONF_VALUE) *values;
  76     CONF_VALUE *vl;
  77     char *vsection = NULL;
  78
  79     int ret, i;
  80
  81     if (!cnf)
  82         return 1;
  83
  84     if (appname)
  85         vsection = NCONF_get_string(cnf, NULL, appname);
  86
  87     if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
  88         vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
  89
  90     if (!vsection) {
  91         ERR_clear_error();
  92         return 1;
  93     }
  94
  95     values = NCONF_get_section(cnf, vsection);
  96
  97     if (!values)
  98         return 0;
  99
 100     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 101         vl = sk_CONF_VALUE_value(values, i);
 102         ret = module_run(cnf, vl->name, vl->value, flags);
 103         if (ret <= 0)
 104             if (!(flags & CONF_MFLAGS_IGNORE_ERRORS))
 105                 return ret;
 106     }
 107
 108     return 1;
 109
 110 }
 111
 112 int CONF_modules_load_file(const char *filename, const char *appname,
 113                            unsigned long flags)
 114 {
 115     char *file = NULL;
 116     CONF *conf = NULL;
 117     int ret = 0;
 118     conf = NCONF_new(NULL);
 119     if (conf == NULL)
 120         goto err;
 121
 122     if (filename == NULL) {
 123         file = CONF_get1_default_config_file();
 124         if (!file)
 125             goto err;
 126     } else
 127         file = (char *)filename;
 128
 129     if (NCONF_load(conf, file, NULL) <= 0) {
 130         if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
 131             (ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
 132             ERR_clear_error();
 133             ret = 1;
 134         }
 135         goto err;
 136     }
 137
 138     ret = CONF_modules_load(conf, appname, flags);
 139
 140  err:
 141     if (filename == NULL)
 142         OPENSSL_free(file);
 143     NCONF_free(conf);
 144
 145     return ret;
 146 }
 147
 148 static int module_run(const CONF *cnf, const char *name, const char *value,
 149                       unsigned long flags)
 150 {
 151     CONF_MODULE *md;
 152     int ret;
 153
 154     md = module_find(name);
 155
 156     /* Module not found: try to load DSO */
 157     if (!md && !(flags & CONF_MFLAGS_NO_DSO))
 158         md = module_load_dso(cnf, name, value);
 159
 160     if (!md) {
 161         if (!(flags & CONF_MFLAGS_SILENT)) {
 162             CONFerr(CONF_F_MODULE_RUN, CONF_R_UNKNOWN_MODULE_NAME);
 163             ERR_add_error_data(2, "module=", name);
 164         }
 165         return -1;
 166     }
 167
 168     ret = module_init(md, name, value, cnf);
 169
 170     if (ret <= 0) {
 171         if (!(flags & CONF_MFLAGS_SILENT)) {
 172             char rcode[DECIMAL_SIZE(ret) + 1];
 173
 174             CONFerr(CONF_F_MODULE_RUN, CONF_R_MODULE_INITIALIZATION_ERROR);
 175             BIO_snprintf(rcode, sizeof(rcode), "%-8d", ret);
 176             ERR_add_error_data(6, "module=", name, ", value=", value,
 177                                ", retcode=", rcode);
 178         }
 179     }
 180
 181     return ret;
 182 }
 183
 184 /* Load a module from a DSO */
 185 static CONF_MODULE *module_load_dso(const CONF *cnf,
 186                                     const char *name, const char *value)
 187 {
 188     DSO *dso = NULL;
 189     conf_init_func *ifunc;
 190     conf_finish_func *ffunc;
 191     const char *path = NULL;
 192     int errcode = 0;
 193     CONF_MODULE *md;
 194     /* Look for alternative path in module section */
 195     path = NCONF_get_string(cnf, value, "path");
 196     if (!path) {
 197         ERR_clear_error();
 198         path = name;
 199     }
 200     dso = DSO_load(NULL, path, NULL, 0);
 201     if (!dso) {
 202         errcode = CONF_R_ERROR_LOADING_DSO;
 203         goto err;
 204     }
 205     ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
 206     if (!ifunc) {
 207         errcode = CONF_R_MISSING_INIT_FUNCTION;
 208         goto err;
 209     }
 210     ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
 211     /* All OK, add module */
 212     md = module_add(dso, name, ifunc, ffunc);
 213
 214     if (!md)
 215         goto err;
 216
 217     return md;
 218
 219  err:
 220     DSO_free(dso);
 221     CONFerr(CONF_F_MODULE_LOAD_DSO, errcode);
 222     ERR_add_error_data(4, "module=", name, ", path=", path);
 223     return NULL;
 224 }
 225
 226 /* add module to list */
 227 static CONF_MODULE *module_add(DSO *dso, const char *name,
 228                                conf_init_func *ifunc, conf_finish_func *ffunc)
 229 {
 230     CONF_MODULE *tmod = NULL;
 231     if (supported_modules == NULL)
 232         supported_modules = sk_CONF_MODULE_new_null();
 233     if (supported_modules == NULL)
 234         return NULL;
 235     if ((tmod = OPENSSL_zalloc(sizeof(*tmod))) == NULL) {
 236         CONFerr(CONF_F_MODULE_ADD, ERR_R_MALLOC_FAILURE);
 237         return NULL;
 238     }
 239
 240     tmod->dso = dso;
 241     tmod->name = OPENSSL_strdup(name);
 242     tmod->init = ifunc;
 243     tmod->finish = ffunc;
 244     if (tmod->name == NULL) {
 245         OPENSSL_free(tmod);
 246         return NULL;
 247     }
 248
 249     if (!sk_CONF_MODULE_push(supported_modules, tmod)) {
 250         OPENSSL_free(tmod->name);
 251         OPENSSL_free(tmod);
 252         return NULL;
 253     }
 254
 255     return tmod;
 256 }
 257
 258 /*
 259  * Find a module from the list. We allow module names of the form
 260  * modname.XXXX to just search for modname to allow the same module to be
 261  * initialized more than once.
 262  */
 263
 264 static CONF_MODULE *module_find(const char *name)
 265 {
 266     CONF_MODULE *tmod;
 267     int i, nchar;
 268     char *p;
 269     p = strrchr(name, '.');
 270
 271     if (p)
 272         nchar = p - name;
 273     else
 274         nchar = strlen(name);
 275
 276     for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++) {
 277         tmod = sk_CONF_MODULE_value(supported_modules, i);
 278         if (strncmp(tmod->name, name, nchar) == 0)
 279             return tmod;
 280     }
 281
 282     return NULL;
 283
 284 }
 285
 286 /* initialize a module */
 287 static int module_init(CONF_MODULE *pmod, const char *name, const char *value,
 288                        const CONF *cnf)
 289 {
 290     int ret = 1;
 291     int init_called = 0;
 292     CONF_IMODULE *imod = NULL;
 293
 294     /* Otherwise add initialized module to list */
 295     imod = OPENSSL_malloc(sizeof(*imod));
 296     if (imod == NULL)
 297         goto err;
 298
 299     imod->pmod = pmod;
 300     imod->name = OPENSSL_strdup(name);
 301     imod->value = OPENSSL_strdup(value);
 302     imod->usr_data = NULL;
 303
 304     if (!imod->name || !imod->value)
 305         goto memerr;
 306
 307     /* Try to initialize module */
 308     if (pmod->init) {
 309         ret = pmod->init(imod, cnf);
 310         init_called = 1;
 311         /* Error occurred, exit */
 312         if (ret <= 0)
 313             goto err;
 314     }
 315
 316     if (initialized_modules == NULL) {
 317         initialized_modules = sk_CONF_IMODULE_new_null();
 318         if (!initialized_modules) {
 319             CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 320             goto err;
 321         }
 322     }
 323
 324     if (!sk_CONF_IMODULE_push(initialized_modules, imod)) {
 325         CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 326         goto err;
 327     }
 328
 329     pmod->links++;
 330
 331     return ret;
 332
 333  err:
 334
 335     /* We've started the module so we'd better finish it */
 336     if (pmod->finish && init_called)
 337         pmod->finish(imod);
 338
 339  memerr:
 340     if (imod) {
 341         OPENSSL_free(imod->name);
 342         OPENSSL_free(imod->value);
 343         OPENSSL_free(imod);
 344     }
 345
 346     return -1;
 347
 348 }
 349
 350 /*
 351  * Unload any dynamic modules that have a link count of zero: i.e. have no
 352  * active initialized modules. If 'all' is set then all modules are unloaded
 353  * including static ones.
 354  */
 355
 356 void CONF_modules_unload(int all)
 357 {
 358     int i;
 359     CONF_MODULE *md;
 360     CONF_modules_finish();
 361     /* unload modules in reverse order */
 362     for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--) {
 363         md = sk_CONF_MODULE_value(supported_modules, i);
 364         /* If static or in use and 'all' not set ignore it */
 365         if (((md->links > 0) || !md->dso) && !all)
 366             continue;
 367         /* Since we're working in reverse this is OK */
 368         (void)sk_CONF_MODULE_delete(supported_modules, i);
 369         module_free(md);
 370     }
 371     if (sk_CONF_MODULE_num(supported_modules) == 0) {
 372         sk_CONF_MODULE_free(supported_modules);
 373         supported_modules = NULL;
 374     }
 375 }
 376
 377 /* unload a single module */
 378 static void module_free(CONF_MODULE *md)
 379 {
 380     DSO_free(md->dso);
 381     OPENSSL_free(md->name);
 382     OPENSSL_free(md);
 383 }
 384
 385 /* finish and free up all modules instances */
 386
 387 void CONF_modules_finish(void)
 388 {
 389     CONF_IMODULE *imod;
 390     while (sk_CONF_IMODULE_num(initialized_modules) > 0) {
 391         imod = sk_CONF_IMODULE_pop(initialized_modules);
 392         module_finish(imod);
 393     }
 394     sk_CONF_IMODULE_free(initialized_modules);
 395     initialized_modules = NULL;
 396 }
 397
 398 /* finish a module instance */
 399
 400 static void module_finish(CONF_IMODULE *imod)
 401 {
 402     if (!imod)
 403         return;
 404     if (imod->pmod->finish)
 405         imod->pmod->finish(imod);
 406     imod->pmod->links--;
 407     OPENSSL_free(imod->name);
 408     OPENSSL_free(imod->value);
 409     OPENSSL_free(imod);
 410 }
 411
 412 /* Add a static module to OpenSSL */
 413
 414 int CONF_module_add(const char *name, conf_init_func *ifunc,
 415                     conf_finish_func *ffunc)
 416 {
 417     if (module_add(NULL, name, ifunc, ffunc))
 418         return 1;
 419     else
 420         return 0;
 421 }
 422
 423 void conf_modules_free_int(void)
 424 {
 425     CONF_modules_finish();
 426     CONF_modules_unload(1);
 427 }
 428
 429 /* Utility functions */
 430
 431 const char *CONF_imodule_get_name(const CONF_IMODULE *md)
 432 {
 433     return md->name;
 434 }
 435
 436 const char *CONF_imodule_get_value(const CONF_IMODULE *md)
 437 {
 438     return md->value;
 439 }
 440
 441 void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
 442 {
 443     return md->usr_data;
 444 }
 445
 446 void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
 447 {
 448     md->usr_data = usr_data;
 449 }
 450
 451 CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
 452 {
 453     return md->pmod;
 454 }
 455
 456 unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
 457 {
 458     return md->flags;
 459 }
 460
 461 void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
 462 {
 463     md->flags = flags;
 464 }
 465
 466 void *CONF_module_get_usr_data(CONF_MODULE *pmod)
 467 {
 468     return pmod->usr_data;
 469 }
 470
 471 void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
 472 {
 473     pmod->usr_data = usr_data;
 474 }
 475
 476 /* Return default config file name */
 477
 478 char *CONF_get1_default_config_file(void)
 479 {
 480     char *file, *sep = "";
 481     int len;
 482
 483     file = getenv("OPENSSL_CONF");
 484     if (file)
 485         return OPENSSL_strdup(file);
 486
 487     len = strlen(X509_get_default_cert_area());
 488 #ifndef OPENSSL_SYS_VMS
 489     len++;
 490     sep = "/";
 491 #endif
 492     len += strlen(OPENSSL_CONF);
 493
 494     file = OPENSSL_malloc(len + 1);
 495
 496     if (file == NULL)
 497         return NULL;
 498     BIO_snprintf(file, len + 1, "%s%s%s", X509_get_default_cert_area(),
 499                  sep, OPENSSL_CONF);
 500
 501     return file;
 502 }
 503
 504 /*
 505  * This function takes a list separated by 'sep' and calls the callback
 506  * function giving the start and length of each member optionally stripping
 507  * leading and trailing whitespace. This can be used to parse comma separated
 508  * lists for example.
 509  */
 510
 511 int CONF_parse_list(const char *list_, int sep, int nospc,
 512                     int (*list_cb) (const char *elem, int len, void *usr),
 513                     void *arg)
 514 {
 515     int ret;
 516     const char *lstart, *tmpend, *p;
 517
 518     if (list_ == NULL) {
 519         CONFerr(CONF_F_CONF_PARSE_LIST, 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 }