crypto/conf/conf_lib.c

   1 /*
   2  * Copyright 2000-2016 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 "e_os.h"
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include "internal/conf.h"
  14 #include "internal/ctype.h"
  15 #include <openssl/crypto.h>
  16 #include <openssl/err.h>
  17 #include <openssl/conf.h>
  18 #include <openssl/conf_api.h>
  19 #include <openssl/lhash.h>
  20
  21 static CONF_METHOD *default_CONF_method = NULL;
  22
  23 /* Init a 'CONF' structure from an old LHASH */
  24
  25 void CONF_set_nconf(CONF *conf, LHASH_OF(CONF_VALUE) *hash)
  26 {
  27     if (default_CONF_method == NULL)
  28         default_CONF_method = NCONF_default();
  29
  30     default_CONF_method->init(conf);
  31     conf->data = hash;
  32 }
  33
  34 /*
  35  * The following section contains the "CONF classic" functions, rewritten in
  36  * terms of the new CONF interface.
  37  */
  38
  39 int CONF_set_default_method(CONF_METHOD *meth)
  40 {
  41     default_CONF_method = meth;
  42     return 1;
  43 }
  44
  45 LHASH_OF(CONF_VALUE) *CONF_load(LHASH_OF(CONF_VALUE) *conf, const char *file,
  46                                 long *eline)
  47 {
  48     LHASH_OF(CONF_VALUE) *ltmp;
  49     BIO *in = NULL;
  50
  51 #ifdef OPENSSL_SYS_VMS
  52     in = BIO_new_file(file, "r");
  53 #else
  54     in = BIO_new_file(file, "rb");
  55 #endif
  56     if (in == NULL) {
  57         CONFerr(CONF_F_CONF_LOAD, ERR_R_SYS_LIB);
  58         return NULL;
  59     }
  60
  61     ltmp = CONF_load_bio(conf, in, eline);
  62     BIO_free(in);
  63
  64     return ltmp;
  65 }
  66
  67 #ifndef OPENSSL_NO_STDIO
  68 LHASH_OF(CONF_VALUE) *CONF_load_fp(LHASH_OF(CONF_VALUE) *conf, FILE *fp,
  69                                    long *eline)
  70 {
  71     BIO *btmp;
  72     LHASH_OF(CONF_VALUE) *ltmp;
  73     if ((btmp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
  74         CONFerr(CONF_F_CONF_LOAD_FP, ERR_R_BUF_LIB);
  75         return NULL;
  76     }
  77     ltmp = CONF_load_bio(conf, btmp, eline);
  78     BIO_free(btmp);
  79     return ltmp;
  80 }
  81 #endif
  82
  83 LHASH_OF(CONF_VALUE) *CONF_load_bio(LHASH_OF(CONF_VALUE) *conf, BIO *bp,
  84                                     long *eline)
  85 {
  86     CONF ctmp;
  87     int ret;
  88
  89     CONF_set_nconf(&ctmp, conf);
  90
  91     ret = NCONF_load_bio(&ctmp, bp, eline);
  92     if (ret)
  93         return ctmp.data;
  94     return NULL;
  95 }
  96
  97 STACK_OF(CONF_VALUE) *CONF_get_section(LHASH_OF(CONF_VALUE) *conf,
  98                                        const char *section)
  99 {
 100     if (conf == NULL) {
 101         return NULL;
 102     } else {
 103         CONF ctmp;
 104         CONF_set_nconf(&ctmp, conf);
 105         return NCONF_get_section(&ctmp, section);
 106     }
 107 }
 108
 109 char *CONF_get_string(LHASH_OF(CONF_VALUE) *conf, const char *group,
 110                       const char *name)
 111 {
 112     if (conf == NULL) {
 113         return NCONF_get_string(NULL, group, name);
 114     } else {
 115         CONF ctmp;
 116         CONF_set_nconf(&ctmp, conf);
 117         return NCONF_get_string(&ctmp, group, name);
 118     }
 119 }
 120
 121 long CONF_get_number(LHASH_OF(CONF_VALUE) *conf, const char *group,
 122                      const char *name)
 123 {
 124     int status;
 125     long result = 0;
 126
 127     ERR_set_mark();
 128     if (conf == NULL) {
 129         status = NCONF_get_number_e(NULL, group, name, &result);
 130     } else {
 131         CONF ctmp;
 132         CONF_set_nconf(&ctmp, conf);
 133         status = NCONF_get_number_e(&ctmp, group, name, &result);
 134     }
 135     ERR_pop_to_mark();
 136     return status == 0 ? 0L : result;
 137 }
 138
 139 void CONF_free(LHASH_OF(CONF_VALUE) *conf)
 140 {
 141     CONF ctmp;
 142     CONF_set_nconf(&ctmp, conf);
 143     NCONF_free_data(&ctmp);
 144 }
 145
 146 #ifndef OPENSSL_NO_STDIO
 147 int CONF_dump_fp(LHASH_OF(CONF_VALUE) *conf, FILE *out)
 148 {
 149     BIO *btmp;
 150     int ret;
 151
 152     if ((btmp = BIO_new_fp(out, BIO_NOCLOSE)) == NULL) {
 153         CONFerr(CONF_F_CONF_DUMP_FP, ERR_R_BUF_LIB);
 154         return 0;
 155     }
 156     ret = CONF_dump_bio(conf, btmp);
 157     BIO_free(btmp);
 158     return ret;
 159 }
 160 #endif
 161
 162 int CONF_dump_bio(LHASH_OF(CONF_VALUE) *conf, BIO *out)
 163 {
 164     CONF ctmp;
 165     CONF_set_nconf(&ctmp, conf);
 166     return NCONF_dump_bio(&ctmp, out);
 167 }
 168
 169 /*
 170  * The following section contains the "New CONF" functions.  They are
 171  * completely centralised around a new CONF structure that may contain
 172  * basically anything, but at least a method pointer and a table of data.
 173  * These functions are also written in terms of the bridge functions used by
 174  * the "CONF classic" functions, for consistency.
 175  */
 176
 177 CONF *NCONF_new(CONF_METHOD *meth)
 178 {
 179     CONF *ret;
 180
 181     if (meth == NULL)
 182         meth = NCONF_default();
 183
 184     ret = meth->create(meth);
 185     if (ret == NULL) {
 186         CONFerr(CONF_F_NCONF_NEW, ERR_R_MALLOC_FAILURE);
 187         return NULL;
 188     }
 189
 190     return ret;
 191 }
 192
 193 void NCONF_free(CONF *conf)
 194 {
 195     if (conf == NULL)
 196         return;
 197     conf->meth->destroy(conf);
 198 }
 199
 200 void NCONF_free_data(CONF *conf)
 201 {
 202     if (conf == NULL)
 203         return;
 204     conf->meth->destroy_data(conf);
 205 }
 206
 207 int NCONF_load(CONF *conf, const char *file, long *eline)
 208 {
 209     if (conf == NULL) {
 210         CONFerr(CONF_F_NCONF_LOAD, CONF_R_NO_CONF);
 211         return 0;
 212     }
 213
 214     return conf->meth->load(conf, file, eline);
 215 }
 216
 217 #ifndef OPENSSL_NO_STDIO
 218 int NCONF_load_fp(CONF *conf, FILE *fp, long *eline)
 219 {
 220     BIO *btmp;
 221     int ret;
 222     if ((btmp = BIO_new_fp(fp, BIO_NOCLOSE)) == NULL) {
 223         CONFerr(CONF_F_NCONF_LOAD_FP, ERR_R_BUF_LIB);
 224         return 0;
 225     }
 226     ret = NCONF_load_bio(conf, btmp, eline);
 227     BIO_free(btmp);
 228     return ret;
 229 }
 230 #endif
 231
 232 int NCONF_load_bio(CONF *conf, BIO *bp, long *eline)
 233 {
 234     if (conf == NULL) {
 235         CONFerr(CONF_F_NCONF_LOAD_BIO, CONF_R_NO_CONF);
 236         return 0;
 237     }
 238
 239     return conf->meth->load_bio(conf, bp, eline);
 240 }
 241
 242 STACK_OF(CONF_VALUE) *NCONF_get_section(const CONF *conf, const char *section)
 243 {
 244     if (conf == NULL) {
 245         CONFerr(CONF_F_NCONF_GET_SECTION, CONF_R_NO_CONF);
 246         return NULL;
 247     }
 248
 249     if (section == NULL) {
 250         CONFerr(CONF_F_NCONF_GET_SECTION, CONF_R_NO_SECTION);
 251         return NULL;
 252     }
 253
 254     return _CONF_get_section_values(conf, section);
 255 }
 256
 257 char *NCONF_get_string(const CONF *conf, const char *group, const char *name)
 258 {
 259     char *s = _CONF_get_string(conf, group, name);
 260
 261     /*
 262      * Since we may get a value from an environment variable even if conf is
 263      * NULL, let's check the value first
 264      */
 265     if (s)
 266         return s;
 267
 268     if (conf == NULL) {
 269         CONFerr(CONF_F_NCONF_GET_STRING,
 270                 CONF_R_NO_CONF_OR_ENVIRONMENT_VARIABLE);
 271         return NULL;
 272     }
 273     CONFerr(CONF_F_NCONF_GET_STRING, CONF_R_NO_VALUE);
 274     ERR_add_error_data(4, "group=", group, " name=", name);
 275     return NULL;
 276 }
 277
 278 static int default_is_number(const CONF *conf, char c)
 279 {
 280     return ossl_isdigit(c);
 281 }
 282
 283 static int default_to_int(const CONF *conf, char c)
 284 {
 285     return (int)(c - '0');
 286 }
 287
 288 int NCONF_get_number_e(const CONF *conf, const char *group, const char *name,
 289                        long *result)
 290 {
 291     char *str;
 292     long res;
 293     int (*is_number)(const CONF *, char) = &default_is_number;
 294     int (*to_int)(const CONF *, char) = &default_to_int;
 295
 296     if (result == NULL) {
 297         CONFerr(CONF_F_NCONF_GET_NUMBER_E, ERR_R_PASSED_NULL_PARAMETER);
 298         return 0;
 299     }
 300
 301     str = NCONF_get_string(conf, group, name);
 302
 303     if (str == NULL)
 304         return 0;
 305
 306     if (conf != NULL) {
 307         if (conf->meth->is_number != NULL)
 308             is_number = conf->meth->is_number;
 309         if (conf->meth->to_int != NULL)
 310             to_int = conf->meth->to_int;
 311     }
 312     for (res = 0; is_number(conf, *str); str++) {
 313         const int d = to_int(conf, *str);
 314
 315         if (res > (LONG_MAX - d) / 10L) {
 316             CONFerr(CONF_F_NCONF_GET_NUMBER_E, CONF_R_NUMBER_TOO_LARGE);
 317             return 0;
 318         }
 319         res = res * 10 + d;
 320     }
 321
 322     *result = res;
 323     return 1;
 324 }
 325
 326 #ifndef OPENSSL_NO_STDIO
 327 int NCONF_dump_fp(const CONF *conf, FILE *out)
 328 {
 329     BIO *btmp;
 330     int ret;
 331     if ((btmp = BIO_new_fp(out, BIO_NOCLOSE)) == NULL) {
 332         CONFerr(CONF_F_NCONF_DUMP_FP, ERR_R_BUF_LIB);
 333         return 0;
 334     }
 335     ret = NCONF_dump_bio(conf, btmp);
 336     BIO_free(btmp);
 337     return ret;
 338 }
 339 #endif
 340
 341 int NCONF_dump_bio(const CONF *conf, BIO *out)
 342 {
 343     if (conf == NULL) {
 344         CONFerr(CONF_F_NCONF_DUMP_BIO, CONF_R_NO_CONF);
 345         return 0;
 346     }
 347
 348     return conf->meth->dump(conf, out);
 349 }
 350
 351 /*
 352  * These routines call the C malloc/free, to avoid intermixing with
 353  * OpenSSL function pointers before the library is initialized.
 354  */
 355 OPENSSL_INIT_SETTINGS *OPENSSL_INIT_new(void)
 356 {
 357     OPENSSL_INIT_SETTINGS *ret = malloc(sizeof(*ret));
 358
 359     if (ret != NULL)
 360         memset(ret, 0, sizeof(*ret));
 361     return ret;
 362 }
 363
 364
 365 #ifndef OPENSSL_NO_STDIO
 366 int OPENSSL_INIT_set_config_appname(OPENSSL_INIT_SETTINGS *settings,
 367                                     const char *appname)
 368 {
 369     char *newappname = NULL;
 370
 371     if (appname != NULL) {
 372         newappname = strdup(appname);
 373         if (newappname == NULL)
 374             return 0;
 375     }
 376
 377     free(settings->appname);
 378     settings->appname = newappname;
 379
 380     return 1;
 381 }
 382 #endif
 383
 384 void OPENSSL_INIT_free(OPENSSL_INIT_SETTINGS *settings)
 385 {
 386     free(settings->appname);
 387     free(settings);
 388 }