crypto/conf/conf_mod.c

   1 /*
   2  * Copyright 2002-2016 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 <stdio.h>
  11 #include <ctype.h>
  12 #include <openssl/crypto.h>
  13 #include "internal/cryptlib.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, char *name, 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(char *name);
  65 static int module_init(CONF_MODULE *pmod, char *name, char *value,
  66                        const CONF *cnf);
  67 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value);
  68
  69 /* Main function: load modules from a CONF structure */
  70
  71 int CONF_modules_load(const CONF *cnf, const char *appname,
  72                       unsigned long flags)
  73 {
  74     STACK_OF(CONF_VALUE) *values;
  75     CONF_VALUE *vl;
  76     char *vsection = NULL;
  77
  78     int ret, i;
  79
  80     if (!cnf)
  81         return 1;
  82
  83     if (appname)
  84         vsection = NCONF_get_string(cnf, NULL, appname);
  85
  86     if (!appname || (!vsection && (flags & CONF_MFLAGS_DEFAULT_SECTION)))
  87         vsection = NCONF_get_string(cnf, NULL, "openssl_conf");
  88
  89     if (!vsection) {
  90         ERR_clear_error();
  91         return 1;
  92     }
  93
  94     values = NCONF_get_section(cnf, vsection);
  95
  96     if (!values)
  97         return 0;
  98
  99     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
 100         vl = sk_CONF_VALUE_value(values, i);
 101         ret = module_run(cnf, vl->name, vl->value, flags);
 102         if (ret <= 0)
 103             if (!(flags & CONF_MFLAGS_IGNORE_ERRORS))
 104                 return ret;
 105     }
 106
 107     return 1;
 108
 109 }
 110
 111 int CONF_modules_load_file(const char *filename, const char *appname,
 112                            unsigned long flags)
 113 {
 114     char *file = NULL;
 115     CONF *conf = NULL;
 116     int ret = 0;
 117     conf = NCONF_new(NULL);
 118     if (conf == NULL)
 119         goto err;
 120
 121     if (filename == NULL) {
 122         file = CONF_get1_default_config_file();
 123         if (!file)
 124             goto err;
 125     } else
 126         file = (char *)filename;
 127
 128     if (NCONF_load(conf, file, NULL) <= 0) {
 129         if ((flags & CONF_MFLAGS_IGNORE_MISSING_FILE) &&
 130             (ERR_GET_REASON(ERR_peek_last_error()) == CONF_R_NO_SUCH_FILE)) {
 131             ERR_clear_error();
 132             ret = 1;
 133         }
 134         goto err;
 135     }
 136
 137     ret = CONF_modules_load(conf, appname, flags);
 138
 139  err:
 140     if (filename == NULL)
 141         OPENSSL_free(file);
 142     NCONF_free(conf);
 143
 144     return ret;
 145 }
 146
 147 static int module_run(const CONF *cnf, char *name, char *value,
 148                       unsigned long flags)
 149 {
 150     CONF_MODULE *md;
 151     int ret;
 152
 153     md = module_find(name);
 154
 155     /* Module not found: try to load DSO */
 156     if (!md && !(flags & CONF_MFLAGS_NO_DSO))
 157         md = module_load_dso(cnf, name, value);
 158
 159     if (!md) {
 160         if (!(flags & CONF_MFLAGS_SILENT)) {
 161             CONFerr(CONF_F_MODULE_RUN, CONF_R_UNKNOWN_MODULE_NAME);
 162             ERR_add_error_data(2, "module=", name);
 163         }
 164         return -1;
 165     }
 166
 167     ret = module_init(md, name, value, cnf);
 168
 169     if (ret <= 0) {
 170         if (!(flags & CONF_MFLAGS_SILENT)) {
 171             char rcode[DECIMAL_SIZE(ret) + 1];
 172             CONFerr(CONF_F_MODULE_RUN, CONF_R_MODULE_INITIALIZATION_ERROR);
 173             BIO_snprintf(rcode, sizeof rcode, "%-8d", ret);
 174             ERR_add_error_data(6, "module=", name, ", value=", value,
 175                                ", retcode=", rcode);
 176         }
 177     }
 178
 179     return ret;
 180 }
 181
 182 /* Load a module from a DSO */
 183 static CONF_MODULE *module_load_dso(const CONF *cnf, char *name, char *value)
 184 {
 185     DSO *dso = NULL;
 186     conf_init_func *ifunc;
 187     conf_finish_func *ffunc;
 188     char *path = NULL;
 189     int errcode = 0;
 190     CONF_MODULE *md;
 191     /* Look for alternative path in module section */
 192     path = NCONF_get_string(cnf, value, "path");
 193     if (!path) {
 194         ERR_clear_error();
 195         path = name;
 196     }
 197     dso = DSO_load(NULL, path, NULL, 0);
 198     if (!dso) {
 199         errcode = CONF_R_ERROR_LOADING_DSO;
 200         goto err;
 201     }
 202     ifunc = (conf_init_func *)DSO_bind_func(dso, DSO_mod_init_name);
 203     if (!ifunc) {
 204         errcode = CONF_R_MISSING_INIT_FUNCTION;
 205         goto err;
 206     }
 207     ffunc = (conf_finish_func *)DSO_bind_func(dso, DSO_mod_finish_name);
 208     /* All OK, add module */
 209     md = module_add(dso, name, ifunc, ffunc);
 210
 211     if (!md)
 212         goto err;
 213
 214     return md;
 215
 216  err:
 217     DSO_free(dso);
 218     CONFerr(CONF_F_MODULE_LOAD_DSO, errcode);
 219     ERR_add_error_data(4, "module=", name, ", path=", path);
 220     return NULL;
 221 }
 222
 223 /* add module to list */
 224 static CONF_MODULE *module_add(DSO *dso, const char *name,
 225                                conf_init_func *ifunc, conf_finish_func *ffunc)
 226 {
 227     CONF_MODULE *tmod = NULL;
 228     if (supported_modules == NULL)
 229         supported_modules = sk_CONF_MODULE_new_null();
 230     if (supported_modules == NULL)
 231         return NULL;
 232     tmod = OPENSSL_zalloc(sizeof(*tmod));
 233     if (tmod == NULL)
 234         return NULL;
 235
 236     tmod->dso = dso;
 237     tmod->name = OPENSSL_strdup(name);
 238     tmod->init = ifunc;
 239     tmod->finish = ffunc;
 240     if (tmod->name == NULL) {
 241         OPENSSL_free(tmod);
 242         return NULL;
 243     }
 244
 245     if (!sk_CONF_MODULE_push(supported_modules, tmod)) {
 246         OPENSSL_free(tmod->name);
 247         OPENSSL_free(tmod);
 248         return NULL;
 249     }
 250
 251     return tmod;
 252 }
 253
 254 /*
 255  * Find a module from the list. We allow module names of the form
 256  * modname.XXXX to just search for modname to allow the same module to be
 257  * initialized more than once.
 258  */
 259
 260 static CONF_MODULE *module_find(char *name)
 261 {
 262     CONF_MODULE *tmod;
 263     int i, nchar;
 264     char *p;
 265     p = strrchr(name, '.');
 266
 267     if (p)
 268         nchar = p - name;
 269     else
 270         nchar = strlen(name);
 271
 272     for (i = 0; i < sk_CONF_MODULE_num(supported_modules); i++) {
 273         tmod = sk_CONF_MODULE_value(supported_modules, i);
 274         if (strncmp(tmod->name, name, nchar) == 0)
 275             return tmod;
 276     }
 277
 278     return NULL;
 279
 280 }
 281
 282 /* initialize a module */
 283 static int module_init(CONF_MODULE *pmod, char *name, char *value,
 284                        const CONF *cnf)
 285 {
 286     int ret = 1;
 287     int init_called = 0;
 288     CONF_IMODULE *imod = NULL;
 289
 290     /* Otherwise add initialized module to list */
 291     imod = OPENSSL_malloc(sizeof(*imod));
 292     if (imod == NULL)
 293         goto err;
 294
 295     imod->pmod = pmod;
 296     imod->name = OPENSSL_strdup(name);
 297     imod->value = OPENSSL_strdup(value);
 298     imod->usr_data = NULL;
 299
 300     if (!imod->name || !imod->value)
 301         goto memerr;
 302
 303     /* Try to initialize module */
 304     if (pmod->init) {
 305         ret = pmod->init(imod, cnf);
 306         init_called = 1;
 307         /* Error occurred, exit */
 308         if (ret <= 0)
 309             goto err;
 310     }
 311
 312     if (initialized_modules == NULL) {
 313         initialized_modules = sk_CONF_IMODULE_new_null();
 314         if (!initialized_modules) {
 315             CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 316             goto err;
 317         }
 318     }
 319
 320     if (!sk_CONF_IMODULE_push(initialized_modules, imod)) {
 321         CONFerr(CONF_F_MODULE_INIT, ERR_R_MALLOC_FAILURE);
 322         goto err;
 323     }
 324
 325     pmod->links++;
 326
 327     return ret;
 328
 329  err:
 330
 331     /* We've started the module so we'd better finish it */
 332     if (pmod->finish && init_called)
 333         pmod->finish(imod);
 334
 335  memerr:
 336     if (imod) {
 337         OPENSSL_free(imod->name);
 338         OPENSSL_free(imod->value);
 339         OPENSSL_free(imod);
 340     }
 341
 342     return -1;
 343
 344 }
 345
 346 /*
 347  * Unload any dynamic modules that have a link count of zero: i.e. have no
 348  * active initialized modules. If 'all' is set then all modules are unloaded
 349  * including static ones.
 350  */
 351
 352 void CONF_modules_unload(int all)
 353 {
 354     int i;
 355     CONF_MODULE *md;
 356     CONF_modules_finish();
 357     /* unload modules in reverse order */
 358     for (i = sk_CONF_MODULE_num(supported_modules) - 1; i >= 0; i--) {
 359         md = sk_CONF_MODULE_value(supported_modules, i);
 360         /* If static or in use and 'all' not set ignore it */
 361         if (((md->links > 0) || !md->dso) && !all)
 362             continue;
 363         /* Since we're working in reverse this is OK */
 364         (void)sk_CONF_MODULE_delete(supported_modules, i);
 365         module_free(md);
 366     }
 367     if (sk_CONF_MODULE_num(supported_modules) == 0) {
 368         sk_CONF_MODULE_free(supported_modules);
 369         supported_modules = NULL;
 370     }
 371 }
 372
 373 /* unload a single module */
 374 static void module_free(CONF_MODULE *md)
 375 {
 376     DSO_free(md->dso);
 377     OPENSSL_free(md->name);
 378     OPENSSL_free(md);
 379 }
 380
 381 /* finish and free up all modules instances */
 382
 383 void CONF_modules_finish(void)
 384 {
 385     CONF_IMODULE *imod;
 386     while (sk_CONF_IMODULE_num(initialized_modules) > 0) {
 387         imod = sk_CONF_IMODULE_pop(initialized_modules);
 388         module_finish(imod);
 389     }
 390     sk_CONF_IMODULE_free(initialized_modules);
 391     initialized_modules = NULL;
 392 }
 393
 394 /* finish a module instance */
 395
 396 static void module_finish(CONF_IMODULE *imod)
 397 {
 398     if (!imod)
 399         return;
 400     if (imod->pmod->finish)
 401         imod->pmod->finish(imod);
 402     imod->pmod->links--;
 403     OPENSSL_free(imod->name);
 404     OPENSSL_free(imod->value);
 405     OPENSSL_free(imod);
 406 }
 407
 408 /* Add a static module to OpenSSL */
 409
 410 int CONF_module_add(const char *name, conf_init_func *ifunc,
 411                     conf_finish_func *ffunc)
 412 {
 413     if (module_add(NULL, name, ifunc, ffunc))
 414         return 1;
 415     else
 416         return 0;
 417 }
 418
 419 void conf_modules_free_int(void)
 420 {
 421     CONF_modules_finish();
 422     CONF_modules_unload(1);
 423 }
 424
 425 /* Utility functions */
 426
 427 const char *CONF_imodule_get_name(const CONF_IMODULE *md)
 428 {
 429     return md->name;
 430 }
 431
 432 const char *CONF_imodule_get_value(const CONF_IMODULE *md)
 433 {
 434     return md->value;
 435 }
 436
 437 void *CONF_imodule_get_usr_data(const CONF_IMODULE *md)
 438 {
 439     return md->usr_data;
 440 }
 441
 442 void CONF_imodule_set_usr_data(CONF_IMODULE *md, void *usr_data)
 443 {
 444     md->usr_data = usr_data;
 445 }
 446
 447 CONF_MODULE *CONF_imodule_get_module(const CONF_IMODULE *md)
 448 {
 449     return md->pmod;
 450 }
 451
 452 unsigned long CONF_imodule_get_flags(const CONF_IMODULE *md)
 453 {
 454     return md->flags;
 455 }
 456
 457 void CONF_imodule_set_flags(CONF_IMODULE *md, unsigned long flags)
 458 {
 459     md->flags = flags;
 460 }
 461
 462 void *CONF_module_get_usr_data(CONF_MODULE *pmod)
 463 {
 464     return pmod->usr_data;
 465 }
 466
 467 void CONF_module_set_usr_data(CONF_MODULE *pmod, void *usr_data)
 468 {
 469     pmod->usr_data = usr_data;
 470 }
 471
 472 /* Return default config file name */
 473
 474 char *CONF_get1_default_config_file(void)
 475 {
 476     char *file;
 477     int len;
 478
 479     file = getenv("OPENSSL_CONF");
 480     if (file)
 481         return OPENSSL_strdup(file);
 482
 483     len = strlen(X509_get_default_cert_area());
 484 #ifndef OPENSSL_SYS_VMS
 485     len++;
 486 #endif
 487     len += strlen(OPENSSL_CONF);
 488
 489     file = OPENSSL_malloc(len + 1);
 490
 491     if (file == NULL)
 492         return NULL;
 493     OPENSSL_strlcpy(file, X509_get_default_cert_area(), len + 1);
 494 #ifndef OPENSSL_SYS_VMS
 495     OPENSSL_strlcat(file, "/", len + 1);
 496 #endif
 497     OPENSSL_strlcat(file, OPENSSL_CONF, len + 1);
 498
 499     return file;
 500 }
 501
 502 /*
 503  * This function takes a list separated by 'sep' and calls the callback
 504  * function giving the start and length of each member optionally stripping
 505  * leading and trailing whitespace. This can be used to parse comma separated
 506  * lists for example.
 507  */
 508
 509 int CONF_parse_list(const char *list_, int sep, int nospc,
 510                     int (*list_cb) (const char *elem, int len, void *usr),
 511                     void *arg)
 512 {
 513     int ret;
 514     const char *lstart, *tmpend, *p;
 515
 516     if (list_ == NULL) {
 517         CONFerr(CONF_F_CONF_PARSE_LIST, CONF_R_LIST_CANNOT_BE_NULL);
 518         return 0;
 519     }
 520
 521     lstart = list_;
 522     for (;;) {
 523         if (nospc) {
 524             while (*lstart && isspace((unsigned char)*lstart))
 525                 lstart++;
 526         }
 527         p = strchr(lstart, sep);
 528         if (p == lstart || !*lstart)
 529             ret = list_cb(NULL, 0, arg);
 530         else {
 531             if (p)
 532                 tmpend = p - 1;
 533             else
 534                 tmpend = lstart + strlen(lstart) - 1;
 535             if (nospc) {
 536                 while (isspace((unsigned char)*tmpend))
 537                     tmpend--;
 538             }
 539             ret = list_cb(lstart, tmpend - lstart + 1, arg);
 540         }
 541         if (ret <= 0)
 542             return ret;
 543         if (p == NULL)
 544             return 1;
 545         lstart = p + 1;
 546     }
 547 }