crypto/conf/conf_def.c

   1 /*
   2  * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 /* Part of the code in here was originally in conf.c, which is now removed */
  11
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include "internal/e_os.h" /* struct stat */
  15 #ifdef __TANDEM
  16 # include <sys/types.h> /* needed for stat.h */
  17 # include <sys/stat.h> /* struct stat */
  18 #endif
  19 #include "internal/cryptlib.h"
  20 #include "internal/o_dir.h"
  21 #include <openssl/lhash.h>
  22 #include <openssl/conf.h>
  23 #include <openssl/conf_api.h>
  24 #include "conf_local.h"
  25 #include "conf_def.h"
  26 #include <openssl/buffer.h>
  27 #include <openssl/err.h>
  28 #ifndef OPENSSL_NO_POSIX_IO
  29 # include <sys/stat.h>
  30 # ifdef _WIN32
  31 #  define stat    _stat
  32 # endif
  33 #endif
  34
  35 #ifndef S_ISDIR
  36 # define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
  37 #endif
  38
  39 /*
  40  * The maximum length we can grow a value to after variable expansion. 64k
  41  * should be more than enough for all reasonable uses.
  42  */
  43 #define MAX_CONF_VALUE_LENGTH       65536
  44
  45 static int is_keytype(const CONF *conf, char c, unsigned short type);
  46 static char *eat_ws(CONF *conf, char *p);
  47 static void trim_ws(CONF *conf, char *start);
  48 static char *eat_alpha_numeric(CONF *conf, char *p);
  49 static void clear_comments(CONF *conf, char *p);
  50 static int str_copy(CONF *conf, char *section, char **to, char *from);
  51 static char *scan_quote(CONF *conf, char *p);
  52 static char *scan_dquote(CONF *conf, char *p);
  53 #define scan_esc(conf,p)        (((IS_EOF((conf),(p)[1]))?((p)+1):((p)+2)))
  54 #ifndef OPENSSL_NO_POSIX_IO
  55 static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
  56                             char **dirpath);
  57 static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx);
  58 #endif
  59
  60 static CONF *def_create(CONF_METHOD *meth);
  61 static int def_init_default(CONF *conf);
  62 #ifndef OPENSSL_NO_DEPRECATED_3_0
  63 static int def_init_WIN32(CONF *conf);
  64 #endif
  65 static int def_destroy(CONF *conf);
  66 static int def_destroy_data(CONF *conf);
  67 static int def_load(CONF *conf, const char *name, long *eline);
  68 static int def_load_bio(CONF *conf, BIO *bp, long *eline);
  69 static int def_dump(const CONF *conf, BIO *bp);
  70 static int def_is_number(const CONF *conf, char c);
  71 static int def_to_int(const CONF *conf, char c);
  72
  73 static CONF_METHOD default_method = {
  74     "OpenSSL default",
  75     def_create,
  76     def_init_default,
  77     def_destroy,
  78     def_destroy_data,
  79     def_load_bio,
  80     def_dump,
  81     def_is_number,
  82     def_to_int,
  83     def_load
  84 };
  85
  86 CONF_METHOD *NCONF_default(void)
  87 {
  88     return &default_method;
  89 }
  90
  91 #ifndef OPENSSL_NO_DEPRECATED_3_0
  92 static CONF_METHOD WIN32_method = {
  93     "WIN32",
  94     def_create,
  95     def_init_WIN32,
  96     def_destroy,
  97     def_destroy_data,
  98     def_load_bio,
  99     def_dump,
 100     def_is_number,
 101     def_to_int,
 102     def_load
 103 };
 104
 105 CONF_METHOD *NCONF_WIN32(void)
 106 {
 107     return &WIN32_method;
 108 }
 109 #endif
 110
 111 static CONF *def_create(CONF_METHOD *meth)
 112 {
 113     CONF *ret;
 114
 115     ret = OPENSSL_malloc(sizeof(*ret));
 116     if (ret != NULL)
 117         if (meth->init(ret) == 0) {
 118             OPENSSL_free(ret);
 119             ret = NULL;
 120         }
 121     return ret;
 122 }
 123
 124 static int def_init_default(CONF *conf)
 125 {
 126     if (conf == NULL)
 127         return 0;
 128
 129     memset(conf, 0, sizeof(*conf));
 130     conf->meth = &default_method;
 131     conf->meth_data = (void *)CONF_type_default;
 132
 133     return 1;
 134 }
 135
 136 #ifndef OPENSSL_NO_DEPRECATED_3_0
 137 static int def_init_WIN32(CONF *conf)
 138 {
 139     if (conf == NULL)
 140         return 0;
 141
 142     memset(conf, 0, sizeof(*conf));
 143     conf->meth = &WIN32_method;
 144     conf->meth_data = (void *)CONF_type_win32;
 145
 146     return 1;
 147 }
 148 #endif
 149
 150 static int def_destroy(CONF *conf)
 151 {
 152     if (def_destroy_data(conf)) {
 153         OPENSSL_free(conf);
 154         return 1;
 155     }
 156     return 0;
 157 }
 158
 159 static int def_destroy_data(CONF *conf)
 160 {
 161     if (conf == NULL)
 162         return 0;
 163     _CONF_free_data(conf);
 164     return 1;
 165 }
 166
 167 static int def_load(CONF *conf, const char *name, long *line)
 168 {
 169     int ret;
 170     BIO *in = NULL;
 171
 172 #ifdef OPENSSL_SYS_VMS
 173     in = BIO_new_file(name, "r");
 174 #else
 175     in = BIO_new_file(name, "rb");
 176 #endif
 177     if (in == NULL) {
 178         if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)
 179             ERR_raise(ERR_LIB_CONF, CONF_R_NO_SUCH_FILE);
 180         else
 181             ERR_raise(ERR_LIB_CONF, ERR_R_SYS_LIB);
 182         return 0;
 183     }
 184
 185     ret = def_load_bio(conf, in, line);
 186     BIO_free(in);
 187
 188     return ret;
 189 }
 190
 191
 192 /* Parse a boolean value and fill in *flag. Return 0 on error. */
 193 static int parsebool(const char *pval, int *flag)
 194 {
 195     if (OPENSSL_strcasecmp(pval, "on") == 0
 196         || OPENSSL_strcasecmp(pval, "true") == 0) {
 197         *flag = 1;
 198     } else if (OPENSSL_strcasecmp(pval, "off") == 0
 199                || OPENSSL_strcasecmp(pval, "false") == 0) {
 200         *flag = 0;
 201     } else {
 202         ERR_raise(ERR_LIB_CONF, CONF_R_INVALID_PRAGMA);
 203         return 0;
 204     }
 205     return 1;
 206 }
 207
 208 static int def_load_bio(CONF *conf, BIO *in, long *line)
 209 {
 210 /* The macro BUFSIZE conflicts with a system macro in VxWorks */
 211 #define CONFBUFSIZE     512
 212     int bufnum = 0, i, ii;
 213     BUF_MEM *buff = NULL;
 214     char *s, *p, *end;
 215     int again;
 216     int first_call = 1;
 217     long eline = 0;
 218     char btmp[DECIMAL_SIZE(eline) + 1];
 219     CONF_VALUE *v = NULL, *tv;
 220     CONF_VALUE *sv = NULL;
 221     char *section = NULL, *buf;
 222     char *start, *psection, *pname;
 223     void *h = (void *)(conf->data);
 224     STACK_OF(BIO) *biosk = NULL;
 225 #ifndef OPENSSL_NO_POSIX_IO
 226     char *dirpath = NULL;
 227     OPENSSL_DIR_CTX *dirctx = NULL;
 228 #endif
 229 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 230     int numincludes = 0;
 231 #endif
 232
 233     if ((buff = BUF_MEM_new()) == NULL) {
 234         ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);
 235         goto err;
 236     }
 237
 238     section = OPENSSL_strdup("default");
 239     if (section == NULL)
 240         goto err;
 241
 242     if (_CONF_new_data(conf) == 0) {
 243         ERR_raise(ERR_LIB_CONF, ERR_R_CONF_LIB);
 244         goto err;
 245     }
 246
 247     sv = _CONF_new_section(conf, section);
 248     if (sv == NULL) {
 249         ERR_raise(ERR_LIB_CONF, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 250         goto err;
 251     }
 252
 253     bufnum = 0;
 254     again = 0;
 255     for (;;) {
 256         if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {
 257             ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);
 258             goto err;
 259         }
 260         p = &(buff->data[bufnum]);
 261         *p = '\0';
 262  read_retry:
 263         if (in != NULL && BIO_gets(in, p, CONFBUFSIZE - 1) < 0)
 264             goto err;
 265         p[CONFBUFSIZE - 1] = '\0';
 266         ii = i = strlen(p);
 267         if (first_call) {
 268             /* Other BOMs imply unsupported multibyte encoding,
 269              * so don't strip them and let the error raise */
 270             const unsigned char utf8_bom[3] = {0xEF, 0xBB, 0xBF};
 271
 272             if (i >= 3 && memcmp(p, utf8_bom, 3) == 0) {
 273                 memmove(p, p + 3, i - 3);
 274                 p[i - 3] = 0;
 275                 i -= 3;
 276                 ii -= 3;
 277             }
 278             first_call = 0;
 279         }
 280         if (i == 0 && !again) {
 281             /* the currently processed BIO is NULL or at EOF */
 282             BIO *parent;
 283
 284 #ifndef OPENSSL_NO_POSIX_IO
 285             /* continue processing with the next file from directory */
 286             if (dirctx != NULL) {
 287                 BIO *next;
 288
 289                 if ((next = get_next_file(dirpath, &dirctx)) != NULL) {
 290                     BIO_vfree(in);
 291                     in = next;
 292                     goto read_retry;
 293                 } else {
 294                     OPENSSL_free(dirpath);
 295                     dirpath = NULL;
 296                 }
 297             }
 298 #endif
 299             /* no more files in directory, continue with processing parent */
 300             if ((parent = sk_BIO_pop(biosk)) == NULL) {
 301                 /* everything processed get out of the loop */
 302                 break;
 303             } else {
 304                 BIO_vfree(in);
 305                 in = parent;
 306                 goto read_retry;
 307             }
 308         }
 309         again = 0;
 310         while (i > 0) {
 311             if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))
 312                 break;
 313             else
 314                 i--;
 315         }
 316         /*
 317          * we removed some trailing stuff so there is a new line on the end.
 318          */
 319         if (ii && i == ii)
 320             again = 1;          /* long line */
 321         else {
 322             p[i] = '\0';
 323             eline++;            /* another input line */
 324         }
 325
 326         /* we now have a line with trailing \r\n removed */
 327
 328         /* i is the number of bytes */
 329         bufnum += i;
 330
 331         v = NULL;
 332         /* check for line continuation */
 333         if (bufnum >= 1) {
 334             /*
 335              * If we have bytes and the last char '\\' and second last char
 336              * is not '\\'
 337              */
 338             p = &(buff->data[bufnum - 1]);
 339             if (IS_ESC(conf, p[0]) && ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {
 340                 bufnum--;
 341                 again = 1;
 342             }
 343         }
 344         if (again)
 345             continue;
 346         bufnum = 0;
 347         buf = buff->data;
 348
 349         clear_comments(conf, buf);
 350         s = eat_ws(conf, buf);
 351         if (IS_EOF(conf, *s))
 352             continue;           /* blank line */
 353         if (*s == '[') {
 354             char *ss;
 355
 356             s++;
 357             start = eat_ws(conf, s);
 358             ss = start;
 359  again:
 360             end = eat_alpha_numeric(conf, ss);
 361             p = eat_ws(conf, end);
 362             if (*p != ']') {
 363                 if (*p != '\0' && ss != p) {
 364                     ss = p;
 365                     goto again;
 366                 }
 367                 ERR_raise(ERR_LIB_CONF, CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
 368                 goto err;
 369             }
 370             *end = '\0';
 371             if (!str_copy(conf, NULL, &section, start))
 372                 goto err;
 373             if ((sv = _CONF_get_section(conf, section)) == NULL)
 374                 sv = _CONF_new_section(conf, section);
 375             if (sv == NULL) {
 376                 ERR_raise(ERR_LIB_CONF, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 377                 goto err;
 378             }
 379             continue;
 380         } else {
 381             pname = s;
 382             end = eat_alpha_numeric(conf, s);
 383             if ((end[0] == ':') && (end[1] == ':')) {
 384                 *end = '\0';
 385                 end += 2;
 386                 psection = pname;
 387                 pname = end;
 388                 end = eat_alpha_numeric(conf, end);
 389             } else {
 390                 psection = section;
 391             }
 392             p = eat_ws(conf, end);
 393             if (CHECK_AND_SKIP_PREFIX(pname, ".pragma")
 394                 && (p != pname || *p == '=')) {
 395                 char *pval;
 396
 397                 if (*p == '=') {
 398                     p++;
 399                     p = eat_ws(conf, p);
 400                 }
 401                 trim_ws(conf, p);
 402
 403                 /* Pragma values take the form keyword:value */
 404                 pval = strchr(p, ':');
 405                 if (pval == NULL || pval == p || pval[1] == '\0') {
 406                     ERR_raise(ERR_LIB_CONF, CONF_R_INVALID_PRAGMA);
 407                     goto err;
 408                 }
 409
 410                 *pval++ = '\0';
 411                 trim_ws(conf, p);
 412                 pval = eat_ws(conf, pval);
 413
 414                 /*
 415                  * Known pragmas:
 416                  *
 417                  * dollarid     takes "on", "true or "off", "false"
 418                  * abspath      takes "on", "true or "off", "false"
 419                  * includedir   directory prefix
 420                  */
 421                 if (strcmp(p, "dollarid") == 0) {
 422                     if (!parsebool(pval, &conf->flag_dollarid))
 423                         goto err;
 424                 } else if (strcmp(p, "abspath") == 0) {
 425                     if (!parsebool(pval, &conf->flag_abspath))
 426                         goto err;
 427                 } else if (strcmp(p, "includedir") == 0) {
 428                     OPENSSL_free(conf->includedir);
 429                     if ((conf->includedir = OPENSSL_strdup(pval)) == NULL)
 430                         goto err;
 431                 }
 432
 433                 /*
 434                  * We *ignore* any unknown pragma.
 435                  */
 436                 continue;
 437             } else if (CHECK_AND_SKIP_PREFIX(pname, ".include")
 438                 && (p != pname || *p == '=')) {
 439                 char *include = NULL;
 440                 BIO *next;
 441                 const char *include_dir = ossl_safe_getenv("OPENSSL_CONF_INCLUDE");
 442                 char *include_path = NULL;
 443
 444 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 445                 /*
 446                  * The include processing below can cause the "conf" fuzzer to
 447                  * timeout due to the fuzzer inserting large and complicated
 448                  * includes - with a large amount of time spent in
 449                  * OPENSSL_strlcat/OPENSSL_strcpy. This is not a security
 450                  * concern because config files should never come from untrusted
 451                  * sources. We just set an arbitrary limit on the allowed
 452                  * number of includes when fuzzing to prevent this timeout.
 453                  */
 454                 if (numincludes++ > 10)
 455                     goto err;
 456 #endif
 457
 458                 if (include_dir == NULL)
 459                     include_dir = conf->includedir;
 460
 461                 if (*p == '=') {
 462                     p++;
 463                     p = eat_ws(conf, p);
 464                 }
 465                 trim_ws(conf, p);
 466                 if (!str_copy(conf, psection, &include, p))
 467                     goto err;
 468
 469                 if (include_dir != NULL && !ossl_is_absolute_path(include)) {
 470                     size_t newlen = strlen(include_dir) + strlen(include) + 2;
 471
 472                     include_path = OPENSSL_malloc(newlen);
 473                     if (include_path == NULL) {
 474                         OPENSSL_free(include);
 475                         goto err;
 476                     }
 477
 478                     OPENSSL_strlcpy(include_path, include_dir, newlen);
 479                     if (!ossl_ends_with_dirsep(include_path))
 480                         OPENSSL_strlcat(include_path, "/", newlen);
 481                     OPENSSL_strlcat(include_path, include, newlen);
 482                     OPENSSL_free(include);
 483                 } else {
 484                     include_path = include;
 485                 }
 486
 487                 if (conf->flag_abspath
 488                         && !ossl_is_absolute_path(include_path)) {
 489                     ERR_raise(ERR_LIB_CONF, CONF_R_RELATIVE_PATH);
 490                     OPENSSL_free(include_path);
 491                     goto err;
 492                 }
 493
 494                 /* get the BIO of the included file */
 495 #ifndef OPENSSL_NO_POSIX_IO
 496                 next = process_include(include_path, &dirctx, &dirpath);
 497                 if (include_path != dirpath) {
 498                     /* dirpath will contain include in case of a directory */
 499                     OPENSSL_free(include_path);
 500                 }
 501 #else
 502                 next = BIO_new_file(include_path, "r");
 503                 OPENSSL_free(include_path);
 504 #endif
 505
 506                 if (next != NULL) {
 507                     /* push the currently processing BIO onto stack */
 508                     if (biosk == NULL) {
 509                         if ((biosk = sk_BIO_new_null()) == NULL) {
 510                             ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
 511                             BIO_free(next);
 512                             goto err;
 513                         }
 514                     }
 515                     if (!sk_BIO_push(biosk, in)) {
 516                         ERR_raise(ERR_LIB_CONF, ERR_R_CRYPTO_LIB);
 517                         BIO_free(next);
 518                         goto err;
 519                     }
 520                     /* continue with reading from the included BIO */
 521                     in = next;
 522                 }
 523                 continue;
 524             } else if (*p != '=') {
 525                 ERR_raise_data(ERR_LIB_CONF, CONF_R_MISSING_EQUAL_SIGN,
 526                                "HERE-->%s", p);
 527                 goto err;
 528             }
 529             *end = '\0';
 530             p++;
 531             start = eat_ws(conf, p);
 532             trim_ws(conf, start);
 533
 534             if ((v = OPENSSL_malloc(sizeof(*v))) == NULL)
 535                 goto err;
 536             v->name = OPENSSL_strdup(pname);
 537             v->value = NULL;
 538             if (v->name == NULL)
 539                 goto err;
 540             if (!str_copy(conf, psection, &(v->value), start))
 541                 goto err;
 542
 543             if (strcmp(psection, section) != 0) {
 544                 if ((tv = _CONF_get_section(conf, psection))
 545                     == NULL)
 546                     tv = _CONF_new_section(conf, psection);
 547                 if (tv == NULL) {
 548                     ERR_raise(ERR_LIB_CONF,
 549                               CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 550                     goto err;
 551                 }
 552             } else
 553                 tv = sv;
 554             if (_CONF_add_string(conf, tv, v) == 0) {
 555                 ERR_raise(ERR_LIB_CONF, ERR_R_CONF_LIB);
 556                 goto err;
 557             }
 558             v = NULL;
 559         }
 560     }
 561     BUF_MEM_free(buff);
 562     OPENSSL_free(section);
 563     /*
 564      * No need to pop, since we only get here if the stack is empty.
 565      * If this causes a BIO leak, THE ISSUE IS SOMEWHERE ELSE!
 566      */
 567     sk_BIO_free(biosk);
 568     return 1;
 569
 570  err:
 571     BUF_MEM_free(buff);
 572     OPENSSL_free(section);
 573     /*
 574      * Since |in| is the first element of the stack and should NOT be freed
 575      * here, we cannot use sk_BIO_pop_free().  Instead, we pop and free one
 576      * BIO at a time, making sure that the last one popped isn't.
 577      */
 578     while (sk_BIO_num(biosk) > 0) {
 579         BIO *popped = sk_BIO_pop(biosk);
 580         BIO_vfree(in);
 581         in = popped;
 582     }
 583     sk_BIO_free(biosk);
 584 #ifndef OPENSSL_NO_POSIX_IO
 585     OPENSSL_free(dirpath);
 586     if (dirctx != NULL)
 587         OPENSSL_DIR_end(&dirctx);
 588 #endif
 589     if (line != NULL)
 590         *line = eline;
 591     BIO_snprintf(btmp, sizeof(btmp), "%ld", eline);
 592     ERR_add_error_data(2, "line ", btmp);
 593     if (h != conf->data) {
 594         CONF_free(conf->data);
 595         conf->data = NULL;
 596     }
 597     if (v != NULL) {
 598         OPENSSL_free(v->name);
 599         OPENSSL_free(v->value);
 600         OPENSSL_free(v);
 601     }
 602     return 0;
 603 }
 604
 605 static void clear_comments(CONF *conf, char *p)
 606 {
 607     for (;;) {
 608         if (IS_FCOMMENT(conf, *p)) {
 609             *p = '\0';
 610             return;
 611         }
 612         if (!IS_WS(conf, *p)) {
 613             break;
 614         }
 615         p++;
 616     }
 617
 618     for (;;) {
 619         if (IS_COMMENT(conf, *p)) {
 620             *p = '\0';
 621             return;
 622         }
 623         if (IS_DQUOTE(conf, *p)) {
 624             p = scan_dquote(conf, p);
 625             continue;
 626         }
 627         if (IS_QUOTE(conf, *p)) {
 628             p = scan_quote(conf, p);
 629             continue;
 630         }
 631         if (IS_ESC(conf, *p)) {
 632             p = scan_esc(conf, p);
 633             continue;
 634         }
 635         if (IS_EOF(conf, *p))
 636             return;
 637         else
 638             p++;
 639     }
 640 }
 641
 642 static int str_copy(CONF *conf, char *section, char **pto, char *from)
 643 {
 644     int q, r, rr = 0, to = 0, len = 0;
 645     char *s, *e, *rp, *p, *rrp, *np, *cp, v;
 646     BUF_MEM *buf;
 647
 648     if ((buf = BUF_MEM_new()) == NULL)
 649         return 0;
 650
 651     len = strlen(from) + 1;
 652     if (!BUF_MEM_grow(buf, len))
 653         goto err;
 654
 655     for (;;) {
 656         if (IS_QUOTE(conf, *from)) {
 657             q = *from;
 658             from++;
 659             while (!IS_EOF(conf, *from) && (*from != q)) {
 660                 if (IS_ESC(conf, *from)) {
 661                     from++;
 662                     if (IS_EOF(conf, *from))
 663                         break;
 664                 }
 665                 buf->data[to++] = *(from++);
 666             }
 667             if (*from == q)
 668                 from++;
 669         } else if (IS_DQUOTE(conf, *from)) {
 670             q = *from;
 671             from++;
 672             while (!IS_EOF(conf, *from)) {
 673                 if (*from == q) {
 674                     if (*(from + 1) == q) {
 675                         from++;
 676                     } else {
 677                         break;
 678                     }
 679                 }
 680                 buf->data[to++] = *(from++);
 681             }
 682             if (*from == q)
 683                 from++;
 684         } else if (IS_ESC(conf, *from)) {
 685             from++;
 686             v = *(from++);
 687             if (IS_EOF(conf, v))
 688                 break;
 689             else if (v == 'r')
 690                 v = '\r';
 691             else if (v == 'n')
 692                 v = '\n';
 693             else if (v == 'b')
 694                 v = '\b';
 695             else if (v == 't')
 696                 v = '\t';
 697             buf->data[to++] = v;
 698         } else if (IS_EOF(conf, *from))
 699             break;
 700         else if (*from == '$'
 701                  && (!conf->flag_dollarid
 702                      || from[1] == '{'
 703                      || from[1] == '(')) {
 704             size_t newsize;
 705
 706             /* try to expand it */
 707             rrp = NULL;
 708             s = &(from[1]);
 709             if (*s == '{')
 710                 q = '}';
 711             else if (*s == '(')
 712                 q = ')';
 713             else
 714                 q = 0;
 715
 716             if (q)
 717                 s++;
 718             cp = section;
 719             e = np = s;
 720             while (IS_ALNUM(conf, *e)
 721                    || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 722                 e++;
 723             if ((e[0] == ':') && (e[1] == ':')) {
 724                 cp = np;
 725                 rrp = e;
 726                 rr = *e;
 727                 *rrp = '\0';
 728                 e += 2;
 729                 np = e;
 730                 while (IS_ALNUM(conf, *e)
 731                        || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 732                     e++;
 733             }
 734             r = *e;
 735             *e = '\0';
 736             rp = e;
 737             if (q) {
 738                 if (r != q) {
 739                     ERR_raise(ERR_LIB_CONF, CONF_R_NO_CLOSE_BRACE);
 740                     goto err;
 741                 }
 742                 e++;
 743             }
 744             /*-
 745              * So at this point we have
 746              * np which is the start of the name string which is
 747              *   '\0' terminated.
 748              * cp which is the start of the section string which is
 749              *   '\0' terminated.
 750              * e is the 'next point after'.
 751              * r and rr are the chars replaced by the '\0'
 752              * rp and rrp is where 'r' and 'rr' came from.
 753              */
 754             p = _CONF_get_string(conf, cp, np);
 755             if (rrp != NULL)
 756                 *rrp = rr;
 757             *rp = r;
 758             if (p == NULL) {
 759                 ERR_raise(ERR_LIB_CONF, CONF_R_VARIABLE_HAS_NO_VALUE);
 760                 goto err;
 761             }
 762             newsize = strlen(p) + buf->length - (e - from);
 763             if (newsize > MAX_CONF_VALUE_LENGTH) {
 764                 ERR_raise(ERR_LIB_CONF, CONF_R_VARIABLE_EXPANSION_TOO_LONG);
 765                 goto err;
 766             }
 767             if (!BUF_MEM_grow_clean(buf, newsize)) {
 768                 ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);
 769                 goto err;
 770             }
 771             while (*p)
 772                 buf->data[to++] = *(p++);
 773
 774             /*
 775              * Since we change the pointer 'from', we also have to change the
 776              * perceived length of the string it points at.  /RL
 777              */
 778             len -= e - from;
 779             from = e;
 780
 781             /*
 782              * In case there were no braces or parenthesis around the
 783              * variable reference, we have to put back the character that was
 784              * replaced with a '\0'.  /RL
 785              */
 786             *rp = r;
 787         } else
 788             buf->data[to++] = *(from++);
 789     }
 790     buf->data[to] = '\0';
 791     OPENSSL_free(*pto);
 792     *pto = buf->data;
 793     OPENSSL_free(buf);
 794     return 1;
 795  err:
 796     BUF_MEM_free(buf);
 797     return 0;
 798 }
 799
 800 #ifndef OPENSSL_NO_POSIX_IO
 801 /*
 802  * Check whether included path is a directory.
 803  * Returns next BIO to process and in case of a directory
 804  * also an opened directory context and the include path.
 805  */
 806 static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
 807                             char **dirpath)
 808 {
 809     struct stat st;
 810     BIO *next;
 811
 812     if (stat(include, &st) < 0) {
 813         ERR_raise_data(ERR_LIB_SYS, errno, "calling stat(%s)", include);
 814         /* missing include file is not fatal error */
 815         return NULL;
 816     }
 817
 818     if (S_ISDIR(st.st_mode)) {
 819         if (*dirctx != NULL) {
 820             ERR_raise_data(ERR_LIB_CONF, CONF_R_RECURSIVE_DIRECTORY_INCLUDE,
 821                            "%s", include);
 822             return NULL;
 823         }
 824         /* a directory, load its contents */
 825         if ((next = get_next_file(include, dirctx)) != NULL)
 826             *dirpath = include;
 827         return next;
 828     }
 829
 830     next = BIO_new_file(include, "r");
 831     return next;
 832 }
 833
 834 /*
 835  * Get next file from the directory path.
 836  * Returns BIO of the next file to read and updates dirctx.
 837  */
 838 static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx)
 839 {
 840     const char *filename;
 841     size_t pathlen;
 842
 843     pathlen = strlen(path);
 844     while ((filename = OPENSSL_DIR_read(dirctx, path)) != NULL) {
 845         size_t namelen;
 846
 847         namelen = strlen(filename);
 848
 849
 850         if ((namelen > 5
 851              && OPENSSL_strcasecmp(filename + namelen - 5, ".conf") == 0)
 852             || (namelen > 4
 853                 && OPENSSL_strcasecmp(filename + namelen - 4, ".cnf") == 0)) {
 854             size_t newlen;
 855             char *newpath;
 856             BIO *bio;
 857
 858             newlen = pathlen + namelen + 2;
 859             newpath = OPENSSL_zalloc(newlen);
 860             if (newpath == NULL)
 861                 break;
 862 #ifdef OPENSSL_SYS_VMS
 863             /*
 864              * If the given path isn't clear VMS syntax,
 865              * we treat it as on Unix.
 866              */
 867             if (path[pathlen - 1] == ']'
 868                 || path[pathlen - 1] == '>'
 869                 || path[pathlen - 1] == ':') {
 870                 /* Clear VMS directory syntax, just copy as is */
 871                 OPENSSL_strlcpy(newpath, path, newlen);
 872             }
 873 #endif
 874             if (newpath[0] == '\0') {
 875                 OPENSSL_strlcpy(newpath, path, newlen);
 876                 OPENSSL_strlcat(newpath, "/", newlen);
 877             }
 878             OPENSSL_strlcat(newpath, filename, newlen);
 879
 880             bio = BIO_new_file(newpath, "r");
 881             OPENSSL_free(newpath);
 882             /* Errors when opening files are non-fatal. */
 883             if (bio != NULL)
 884                 return bio;
 885         }
 886     }
 887     OPENSSL_DIR_end(dirctx);
 888     *dirctx = NULL;
 889     return NULL;
 890 }
 891 #endif
 892
 893 static int is_keytype(const CONF *conf, char c, unsigned short type)
 894 {
 895     const unsigned short *keytypes = (const unsigned short *) conf->meth_data;
 896     unsigned char key = (unsigned char)c;
 897
 898 #ifdef CHARSET_EBCDIC
 899 # if CHAR_BIT > 8
 900     if (key > 255) {
 901         /* key is out of range for os_toascii table */
 902         return 0;
 903     }
 904 # endif
 905     /* convert key from ebcdic to ascii */
 906     key = os_toascii[key];
 907 #endif
 908
 909     if (key > 127) {
 910         /* key is not a seven bit ascii character */
 911         return 0;
 912     }
 913
 914     return (keytypes[key] & type) ? 1 : 0;
 915 }
 916
 917 static char *eat_ws(CONF *conf, char *p)
 918 {
 919     while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
 920         p++;
 921     return p;
 922 }
 923
 924 static void trim_ws(CONF *conf, char *start)
 925 {
 926     char *p = start;
 927
 928     while (!IS_EOF(conf, *p))
 929         p++;
 930     p--;
 931     while ((p >= start) && IS_WS(conf, *p))
 932         p--;
 933     p++;
 934     *p = '\0';
 935 }
 936
 937 static char *eat_alpha_numeric(CONF *conf, char *p)
 938 {
 939     for (;;) {
 940         if (IS_ESC(conf, *p)) {
 941             p = scan_esc(conf, p);
 942             continue;
 943         }
 944         if (!(IS_ALNUM_PUNCT(conf, *p)
 945               || (conf->flag_dollarid && IS_DOLLAR(conf, *p))))
 946             return p;
 947         p++;
 948     }
 949 }
 950
 951 static char *scan_quote(CONF *conf, char *p)
 952 {
 953     int q = *p;
 954
 955     p++;
 956     while (!(IS_EOF(conf, *p)) && (*p != q)) {
 957         if (IS_ESC(conf, *p)) {
 958             p++;
 959             if (IS_EOF(conf, *p))
 960                 return p;
 961         }
 962         p++;
 963     }
 964     if (*p == q)
 965         p++;
 966     return p;
 967 }
 968
 969 static char *scan_dquote(CONF *conf, char *p)
 970 {
 971     int q = *p;
 972
 973     p++;
 974     while (!(IS_EOF(conf, *p))) {
 975         if (*p == q) {
 976             if (*(p + 1) == q) {
 977                 p++;
 978             } else {
 979                 break;
 980             }
 981         }
 982         p++;
 983     }
 984     if (*p == q)
 985         p++;
 986     return p;
 987 }
 988
 989 static void dump_value_doall_arg(const CONF_VALUE *a, BIO *out)
 990 {
 991     if (a->name)
 992         BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
 993     else
 994         BIO_printf(out, "[[%s]]\n", a->section);
 995 }
 996
 997 IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, BIO);
 998
 999 static int def_dump(const CONF *conf, BIO *out)
1000 {
1001     lh_CONF_VALUE_doall_BIO(conf->data, dump_value_doall_arg, out);
1002     return 1;
1003 }
1004
1005 static int def_is_number(const CONF *conf, char c)
1006 {
1007     return IS_NUMBER(conf, c);
1008 }
1009
1010 static int def_to_int(const CONF *conf, char c)
1011 {
1012     return c - '0';
1013 }