crypto/conf/conf_def.c

   1 /*
   2  * Copyright 1995-2021 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 #ifdef __TANDEM
  15 # include <strings.h> /* strcasecmp */
  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_def.h"
  25 #include <openssl/buffer.h>
  26 #include <openssl/err.h>
  27 #ifndef OPENSSL_NO_POSIX_IO
  28 # include <sys/stat.h>
  29 # ifdef _WIN32
  30 #  define stat    _stat
  31 #  define strcasecmp _stricmp
  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 (strcasecmp(pval, "on") == 0
 196             || strcasecmp(pval, "true") == 0) {
 197         *flag = 1;
 198     } else if (strcasecmp(pval, "off") == 0
 199             || 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
 230     if ((buff = BUF_MEM_new()) == NULL) {
 231         ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);
 232         goto err;
 233     }
 234
 235     section = OPENSSL_strdup("default");
 236     if (section == NULL) {
 237         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 238         goto err;
 239     }
 240
 241     if (_CONF_new_data(conf) == 0) {
 242         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 243         goto err;
 244     }
 245
 246     sv = _CONF_new_section(conf, section);
 247     if (sv == NULL) {
 248         ERR_raise(ERR_LIB_CONF, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 249         goto err;
 250     }
 251
 252     bufnum = 0;
 253     again = 0;
 254     for (;;) {
 255         if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {
 256             ERR_raise(ERR_LIB_CONF, ERR_R_BUF_LIB);
 257             goto err;
 258         }
 259         p = &(buff->data[bufnum]);
 260         *p = '\0';
 261  read_retry:
 262         if (in != NULL && BIO_gets(in, p, CONFBUFSIZE - 1) < 0)
 263             goto err;
 264         p[CONFBUFSIZE - 1] = '\0';
 265         ii = i = strlen(p);
 266         if (first_call) {
 267             /* Other BOMs imply unsupported multibyte encoding,
 268              * so don't strip them and let the error raise */
 269             const unsigned char utf8_bom[3] = {0xEF, 0xBB, 0xBF};
 270
 271             if (i >= 3 && memcmp(p, utf8_bom, 3) == 0) {
 272                 memmove(p, p + 3, i - 3);
 273                 p[i - 3] = 0;
 274                 i -= 3;
 275                 ii -= 3;
 276             }
 277             first_call = 0;
 278         }
 279         if (i == 0 && !again) {
 280             /* the currently processed BIO is NULL or at EOF */
 281             BIO *parent;
 282
 283 #ifndef OPENSSL_NO_POSIX_IO
 284             /* continue processing with the next file from directory */
 285             if (dirctx != NULL) {
 286                 BIO *next;
 287
 288                 if ((next = get_next_file(dirpath, &dirctx)) != NULL) {
 289                     BIO_vfree(in);
 290                     in = next;
 291                     goto read_retry;
 292                 } else {
 293                     OPENSSL_free(dirpath);
 294                     dirpath = NULL;
 295                 }
 296             }
 297 #endif
 298             /* no more files in directory, continue with processing parent */
 299             if ((parent = sk_BIO_pop(biosk)) == NULL) {
 300                 /* everything processed get out of the loop */
 301                 break;
 302             } else {
 303                 BIO_vfree(in);
 304                 in = parent;
 305                 goto read_retry;
 306             }
 307         }
 308         again = 0;
 309         while (i > 0) {
 310             if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))
 311                 break;
 312             else
 313                 i--;
 314         }
 315         /*
 316          * we removed some trailing stuff so there is a new line on the end.
 317          */
 318         if (ii && i == ii)
 319             again = 1;          /* long line */
 320         else {
 321             p[i] = '\0';
 322             eline++;            /* another input line */
 323         }
 324
 325         /* we now have a line with trailing \r\n removed */
 326
 327         /* i is the number of bytes */
 328         bufnum += i;
 329
 330         v = NULL;
 331         /* check for line continuation */
 332         if (bufnum >= 1) {
 333             /*
 334              * If we have bytes and the last char '\\' and second last char
 335              * is not '\\'
 336              */
 337             p = &(buff->data[bufnum - 1]);
 338             if (IS_ESC(conf, p[0]) && ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {
 339                 bufnum--;
 340                 again = 1;
 341             }
 342         }
 343         if (again)
 344             continue;
 345         bufnum = 0;
 346         buf = buff->data;
 347
 348         clear_comments(conf, buf);
 349         s = eat_ws(conf, buf);
 350         if (IS_EOF(conf, *s))
 351             continue;           /* blank line */
 352         if (*s == '[') {
 353             char *ss;
 354
 355             s++;
 356             start = eat_ws(conf, s);
 357             ss = start;
 358  again:
 359             end = eat_alpha_numeric(conf, ss);
 360             p = eat_ws(conf, end);
 361             if (*p != ']') {
 362                 if (*p != '\0' && ss != p) {
 363                     ss = p;
 364                     goto again;
 365                 }
 366                 ERR_raise(ERR_LIB_CONF, CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
 367                 goto err;
 368             }
 369             *end = '\0';
 370             if (!str_copy(conf, NULL, &section, start))
 371                 goto err;
 372             if ((sv = _CONF_get_section(conf, section)) == NULL)
 373                 sv = _CONF_new_section(conf, section);
 374             if (sv == NULL) {
 375                 ERR_raise(ERR_LIB_CONF, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 376                 goto err;
 377             }
 378             continue;
 379         } else {
 380             pname = s;
 381             end = eat_alpha_numeric(conf, s);
 382             if ((end[0] == ':') && (end[1] == ':')) {
 383                 *end = '\0';
 384                 end += 2;
 385                 psection = pname;
 386                 pname = end;
 387                 end = eat_alpha_numeric(conf, end);
 388             } else {
 389                 psection = section;
 390             }
 391             p = eat_ws(conf, end);
 392             if (strncmp(pname, ".pragma", 7) == 0
 393                 && (p != pname + 7 || *p == '=')) {
 394                 char *pval;
 395
 396                 if (*p == '=') {
 397                     p++;
 398                     p = eat_ws(conf, p);
 399                 }
 400                 trim_ws(conf, p);
 401
 402                 /* Pragma values take the form keyword:value */
 403                 pval = strchr(p, ':');
 404                 if (pval == NULL || pval == p || pval[1] == '\0') {
 405                     ERR_raise(ERR_LIB_CONF, CONF_R_INVALID_PRAGMA);
 406                     goto err;
 407                 }
 408
 409                 *pval++ = '\0';
 410                 trim_ws(conf, p);
 411                 pval = eat_ws(conf, pval);
 412
 413                 /*
 414                  * Known pragmas:
 415                  *
 416                  * dollarid     takes "on", "true or "off", "false"
 417                  * abspath      takes "on", "true or "off", "false"
 418                  * includedir   directory prefix
 419                  */
 420                 if (strcmp(p, "dollarid") == 0) {
 421                     if (!parsebool(pval, &conf->flag_dollarid))
 422                         goto err;
 423                 } else if (strcmp(p, "abspath") == 0) {
 424                     if (!parsebool(pval, &conf->flag_abspath))
 425                         goto err;
 426                 } else if (strcmp(p, "includedir") == 0) {
 427                     if ((conf->includedir = OPENSSL_strdup(pval)) == NULL) {
 428                         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 429                         goto err;
 430                     }
 431                 }
 432
 433                 /*
 434                  * We *ignore* any unknown pragma.
 435                  */
 436                 continue;
 437             } else if (strncmp(pname, ".include", 8) == 0
 438                 && (p != pname + 8 || *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                 if (include_dir == NULL)
 445                     include_dir = conf->includedir;
 446
 447                 if (*p == '=') {
 448                     p++;
 449                     p = eat_ws(conf, p);
 450                 }
 451                 trim_ws(conf, p);
 452                 if (!str_copy(conf, psection, &include, p))
 453                     goto err;
 454
 455                 if (include_dir != NULL && !ossl_is_absolute_path(include)) {
 456                     size_t newlen = strlen(include_dir) + strlen(include) + 2;
 457
 458                     include_path = OPENSSL_malloc(newlen);
 459                     if (include_path == NULL) {
 460                         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 461                         OPENSSL_free(include);
 462                         goto err;
 463                     }
 464
 465                     OPENSSL_strlcpy(include_path, include_dir, newlen);
 466                     if (!ossl_ends_with_dirsep(include_path))
 467                         OPENSSL_strlcat(include_path, "/", newlen);
 468                     OPENSSL_strlcat(include_path, include, newlen);
 469                     OPENSSL_free(include);
 470                 } else {
 471                     include_path = include;
 472                 }
 473
 474                 if (conf->flag_abspath
 475                         && !ossl_is_absolute_path(include_path)) {
 476                     ERR_raise(ERR_LIB_CONF, CONF_R_RELATIVE_PATH);
 477                     goto err;
 478                 }
 479
 480                 /* get the BIO of the included file */
 481 #ifndef OPENSSL_NO_POSIX_IO
 482                 next = process_include(include_path, &dirctx, &dirpath);
 483                 if (include_path != dirpath) {
 484                     /* dirpath will contain include in case of a directory */
 485                     OPENSSL_free(include_path);
 486                 }
 487 #else
 488                 next = BIO_new_file(include_path, "r");
 489                 OPENSSL_free(include_path);
 490 #endif
 491
 492                 if (next != NULL) {
 493                     /* push the currently processing BIO onto stack */
 494                     if (biosk == NULL) {
 495                         if ((biosk = sk_BIO_new_null()) == NULL) {
 496                             ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 497                             BIO_free(next);
 498                             goto err;
 499                         }
 500                     }
 501                     if (!sk_BIO_push(biosk, in)) {
 502                         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 503                         BIO_free(next);
 504                         goto err;
 505                     }
 506                     /* continue with reading from the included BIO */
 507                     in = next;
 508                 }
 509                 continue;
 510             } else if (*p != '=') {
 511                 ERR_raise_data(ERR_LIB_CONF, CONF_R_MISSING_EQUAL_SIGN,
 512                                "HERE-->%s", p);
 513                 goto err;
 514             }
 515             *end = '\0';
 516             p++;
 517             start = eat_ws(conf, p);
 518             trim_ws(conf, start);
 519
 520             if ((v = OPENSSL_malloc(sizeof(*v))) == NULL) {
 521                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 522                 goto err;
 523             }
 524             v->name = OPENSSL_strdup(pname);
 525             v->value = NULL;
 526             if (v->name == NULL) {
 527                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 528                 goto err;
 529             }
 530             if (!str_copy(conf, psection, &(v->value), start))
 531                 goto err;
 532
 533             if (strcmp(psection, section) != 0) {
 534                 if ((tv = _CONF_get_section(conf, psection))
 535                     == NULL)
 536                     tv = _CONF_new_section(conf, psection);
 537                 if (tv == NULL) {
 538                     ERR_raise(ERR_LIB_CONF,
 539                               CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 540                     goto err;
 541                 }
 542             } else
 543                 tv = sv;
 544             if (_CONF_add_string(conf, tv, v) == 0) {
 545                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 546                 goto err;
 547             }
 548             v = NULL;
 549         }
 550     }
 551     BUF_MEM_free(buff);
 552     OPENSSL_free(section);
 553     /*
 554      * No need to pop, since we only get here if the stack is empty.
 555      * If this causes a BIO leak, THE ISSUE IS SOMEWHERE ELSE!
 556      */
 557     sk_BIO_free(biosk);
 558     return 1;
 559
 560  err:
 561     BUF_MEM_free(buff);
 562     OPENSSL_free(section);
 563     /*
 564      * Since |in| is the first element of the stack and should NOT be freed
 565      * here, we cannot use sk_BIO_pop_free().  Instead, we pop and free one
 566      * BIO at a time, making sure that the last one popped isn't.
 567      */
 568     while (sk_BIO_num(biosk) > 0) {
 569         BIO *popped = sk_BIO_pop(biosk);
 570         BIO_vfree(in);
 571         in = popped;
 572     }
 573     sk_BIO_free(biosk);
 574 #ifndef OPENSSL_NO_POSIX_IO
 575     OPENSSL_free(dirpath);
 576     if (dirctx != NULL)
 577         OPENSSL_DIR_end(&dirctx);
 578 #endif
 579     if (line != NULL)
 580         *line = eline;
 581     BIO_snprintf(btmp, sizeof(btmp), "%ld", eline);
 582     ERR_add_error_data(2, "line ", btmp);
 583     if (h != conf->data) {
 584         CONF_free(conf->data);
 585         conf->data = NULL;
 586     }
 587     if (v != NULL) {
 588         OPENSSL_free(v->name);
 589         OPENSSL_free(v->value);
 590         OPENSSL_free(v);
 591     }
 592     return 0;
 593 }
 594
 595 static void clear_comments(CONF *conf, char *p)
 596 {
 597     for (;;) {
 598         if (IS_FCOMMENT(conf, *p)) {
 599             *p = '\0';
 600             return;
 601         }
 602         if (!IS_WS(conf, *p)) {
 603             break;
 604         }
 605         p++;
 606     }
 607
 608     for (;;) {
 609         if (IS_COMMENT(conf, *p)) {
 610             *p = '\0';
 611             return;
 612         }
 613         if (IS_DQUOTE(conf, *p)) {
 614             p = scan_dquote(conf, p);
 615             continue;
 616         }
 617         if (IS_QUOTE(conf, *p)) {
 618             p = scan_quote(conf, p);
 619             continue;
 620         }
 621         if (IS_ESC(conf, *p)) {
 622             p = scan_esc(conf, p);
 623             continue;
 624         }
 625         if (IS_EOF(conf, *p))
 626             return;
 627         else
 628             p++;
 629     }
 630 }
 631
 632 static int str_copy(CONF *conf, char *section, char **pto, char *from)
 633 {
 634     int q, r, rr = 0, to = 0, len = 0;
 635     char *s, *e, *rp, *p, *rrp, *np, *cp, v;
 636     BUF_MEM *buf;
 637
 638     if ((buf = BUF_MEM_new()) == NULL)
 639         return 0;
 640
 641     len = strlen(from) + 1;
 642     if (!BUF_MEM_grow(buf, len))
 643         goto err;
 644
 645     for (;;) {
 646         if (IS_QUOTE(conf, *from)) {
 647             q = *from;
 648             from++;
 649             while (!IS_EOF(conf, *from) && (*from != q)) {
 650                 if (IS_ESC(conf, *from)) {
 651                     from++;
 652                     if (IS_EOF(conf, *from))
 653                         break;
 654                 }
 655                 buf->data[to++] = *(from++);
 656             }
 657             if (*from == q)
 658                 from++;
 659         } else if (IS_DQUOTE(conf, *from)) {
 660             q = *from;
 661             from++;
 662             while (!IS_EOF(conf, *from)) {
 663                 if (*from == q) {
 664                     if (*(from + 1) == q) {
 665                         from++;
 666                     } else {
 667                         break;
 668                     }
 669                 }
 670                 buf->data[to++] = *(from++);
 671             }
 672             if (*from == q)
 673                 from++;
 674         } else if (IS_ESC(conf, *from)) {
 675             from++;
 676             v = *(from++);
 677             if (IS_EOF(conf, v))
 678                 break;
 679             else if (v == 'r')
 680                 v = '\r';
 681             else if (v == 'n')
 682                 v = '\n';
 683             else if (v == 'b')
 684                 v = '\b';
 685             else if (v == 't')
 686                 v = '\t';
 687             buf->data[to++] = v;
 688         } else if (IS_EOF(conf, *from))
 689             break;
 690         else if (*from == '$'
 691                  && (!conf->flag_dollarid
 692                      || from[1] == '{'
 693                      || from[1] == '(')) {
 694             size_t newsize;
 695
 696             /* try to expand it */
 697             rrp = NULL;
 698             s = &(from[1]);
 699             if (*s == '{')
 700                 q = '}';
 701             else if (*s == '(')
 702                 q = ')';
 703             else
 704                 q = 0;
 705
 706             if (q)
 707                 s++;
 708             cp = section;
 709             e = np = s;
 710             while (IS_ALNUM(conf, *e)
 711                    || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 712                 e++;
 713             if ((e[0] == ':') && (e[1] == ':')) {
 714                 cp = np;
 715                 rrp = e;
 716                 rr = *e;
 717                 *rrp = '\0';
 718                 e += 2;
 719                 np = e;
 720                 while (IS_ALNUM(conf, *e)
 721                        || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 722                     e++;
 723             }
 724             r = *e;
 725             *e = '\0';
 726             rp = e;
 727             if (q) {
 728                 if (r != q) {
 729                     ERR_raise(ERR_LIB_CONF, CONF_R_NO_CLOSE_BRACE);
 730                     goto err;
 731                 }
 732                 e++;
 733             }
 734             /*-
 735              * So at this point we have
 736              * np which is the start of the name string which is
 737              *   '\0' terminated.
 738              * cp which is the start of the section string which is
 739              *   '\0' terminated.
 740              * e is the 'next point after'.
 741              * r and rr are the chars replaced by the '\0'
 742              * rp and rrp is where 'r' and 'rr' came from.
 743              */
 744             p = _CONF_get_string(conf, cp, np);
 745             if (rrp != NULL)
 746                 *rrp = rr;
 747             *rp = r;
 748             if (p == NULL) {
 749                 ERR_raise(ERR_LIB_CONF, CONF_R_VARIABLE_HAS_NO_VALUE);
 750                 goto err;
 751             }
 752             newsize = strlen(p) + buf->length - (e - from);
 753             if (newsize > MAX_CONF_VALUE_LENGTH) {
 754                 ERR_raise(ERR_LIB_CONF, CONF_R_VARIABLE_EXPANSION_TOO_LONG);
 755                 goto err;
 756             }
 757             if (!BUF_MEM_grow_clean(buf, newsize)) {
 758                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 759                 goto err;
 760             }
 761             while (*p)
 762                 buf->data[to++] = *(p++);
 763
 764             /*
 765              * Since we change the pointer 'from', we also have to change the
 766              * perceived length of the string it points at.  /RL
 767              */
 768             len -= e - from;
 769             from = e;
 770
 771             /*
 772              * In case there were no braces or parenthesis around the
 773              * variable reference, we have to put back the character that was
 774              * replaced with a '\0'.  /RL
 775              */
 776             *rp = r;
 777         } else
 778             buf->data[to++] = *(from++);
 779     }
 780     buf->data[to] = '\0';
 781     OPENSSL_free(*pto);
 782     *pto = buf->data;
 783     OPENSSL_free(buf);
 784     return 1;
 785  err:
 786     BUF_MEM_free(buf);
 787     return 0;
 788 }
 789
 790 #ifndef OPENSSL_NO_POSIX_IO
 791 /*
 792  * Check whether included path is a directory.
 793  * Returns next BIO to process and in case of a directory
 794  * also an opened directory context and the include path.
 795  */
 796 static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
 797                             char **dirpath)
 798 {
 799     struct stat st;
 800     BIO *next;
 801
 802     if (stat(include, &st) < 0) {
 803         ERR_raise_data(ERR_LIB_SYS, errno, "calling stat(%s)", include);
 804         /* missing include file is not fatal error */
 805         return NULL;
 806     }
 807
 808     if (S_ISDIR(st.st_mode)) {
 809         if (*dirctx != NULL) {
 810             ERR_raise_data(ERR_LIB_CONF, CONF_R_RECURSIVE_DIRECTORY_INCLUDE,
 811                            "%s", include);
 812             return NULL;
 813         }
 814         /* a directory, load its contents */
 815         if ((next = get_next_file(include, dirctx)) != NULL)
 816             *dirpath = include;
 817         return next;
 818     }
 819
 820     next = BIO_new_file(include, "r");
 821     return next;
 822 }
 823
 824 /*
 825  * Get next file from the directory path.
 826  * Returns BIO of the next file to read and updates dirctx.
 827  */
 828 static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx)
 829 {
 830     const char *filename;
 831     size_t pathlen;
 832
 833     pathlen = strlen(path);
 834     while ((filename = OPENSSL_DIR_read(dirctx, path)) != NULL) {
 835         size_t namelen;
 836
 837         namelen = strlen(filename);
 838
 839
 840         if ((namelen > 5 && strcasecmp(filename + namelen - 5, ".conf") == 0)
 841             || (namelen > 4 && strcasecmp(filename + namelen - 4, ".cnf") == 0)) {
 842             size_t newlen;
 843             char *newpath;
 844             BIO *bio;
 845
 846             newlen = pathlen + namelen + 2;
 847             newpath = OPENSSL_zalloc(newlen);
 848             if (newpath == NULL) {
 849                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 850                 break;
 851             }
 852 #ifdef OPENSSL_SYS_VMS
 853             /*
 854              * If the given path isn't clear VMS syntax,
 855              * we treat it as on Unix.
 856              */
 857             if (path[pathlen - 1] == ']'
 858                 || path[pathlen - 1] == '>'
 859                 || path[pathlen - 1] == ':') {
 860                 /* Clear VMS directory syntax, just copy as is */
 861                 OPENSSL_strlcpy(newpath, path, newlen);
 862             }
 863 #endif
 864             if (newpath[0] == '\0') {
 865                 OPENSSL_strlcpy(newpath, path, newlen);
 866                 OPENSSL_strlcat(newpath, "/", newlen);
 867             }
 868             OPENSSL_strlcat(newpath, filename, newlen);
 869
 870             bio = BIO_new_file(newpath, "r");
 871             OPENSSL_free(newpath);
 872             /* Errors when opening files are non-fatal. */
 873             if (bio != NULL)
 874                 return bio;
 875         }
 876     }
 877     OPENSSL_DIR_end(dirctx);
 878     *dirctx = NULL;
 879     return NULL;
 880 }
 881 #endif
 882
 883 static int is_keytype(const CONF *conf, char c, unsigned short type)
 884 {
 885     const unsigned short * keytypes = (const unsigned short *) conf->meth_data;
 886     unsigned char key = (unsigned char)c;
 887
 888 #ifdef CHARSET_EBCDIC
 889 # if CHAR_BIT > 8
 890     if (key > 255) {
 891         /* key is out of range for os_toascii table */
 892         return 0;
 893     }
 894 # endif
 895     /* convert key from ebcdic to ascii */
 896     key = os_toascii[key];
 897 #endif
 898
 899     if (key > 127) {
 900         /* key is not a seven bit ascii character */
 901         return 0;
 902     }
 903
 904     return (keytypes[key] & type) ? 1 : 0;
 905 }
 906
 907 static char *eat_ws(CONF *conf, char *p)
 908 {
 909     while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
 910         p++;
 911     return p;
 912 }
 913
 914 static void trim_ws(CONF *conf, char *start)
 915 {
 916     char *p = start;
 917
 918     while (!IS_EOF(conf, *p))
 919         p++;
 920     p--;
 921     while ((p >= start) && IS_WS(conf, *p))
 922         p--;
 923     p++;
 924     *p = '\0';
 925 }
 926
 927 static char *eat_alpha_numeric(CONF *conf, char *p)
 928 {
 929     for (;;) {
 930         if (IS_ESC(conf, *p)) {
 931             p = scan_esc(conf, p);
 932             continue;
 933         }
 934         if (!(IS_ALNUM_PUNCT(conf, *p)
 935               || (conf->flag_dollarid && IS_DOLLAR(conf, *p))))
 936             return p;
 937         p++;
 938     }
 939 }
 940
 941 static char *scan_quote(CONF *conf, char *p)
 942 {
 943     int q = *p;
 944
 945     p++;
 946     while (!(IS_EOF(conf, *p)) && (*p != q)) {
 947         if (IS_ESC(conf, *p)) {
 948             p++;
 949             if (IS_EOF(conf, *p))
 950                 return p;
 951         }
 952         p++;
 953     }
 954     if (*p == q)
 955         p++;
 956     return p;
 957 }
 958
 959 static char *scan_dquote(CONF *conf, char *p)
 960 {
 961     int q = *p;
 962
 963     p++;
 964     while (!(IS_EOF(conf, *p))) {
 965         if (*p == q) {
 966             if (*(p + 1) == q) {
 967                 p++;
 968             } else {
 969                 break;
 970             }
 971         }
 972         p++;
 973     }
 974     if (*p == q)
 975         p++;
 976     return p;
 977 }
 978
 979 static void dump_value_doall_arg(const CONF_VALUE *a, BIO *out)
 980 {
 981     if (a->name)
 982         BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
 983     else
 984         BIO_printf(out, "[[%s]]\n", a->section);
 985 }
 986
 987 IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, BIO);
 988
 989 static int def_dump(const CONF *conf, BIO *out)
 990 {
 991     lh_CONF_VALUE_doall_BIO(conf->data, dump_value_doall_arg, out);
 992     return 1;
 993 }
 994
 995 static int def_is_number(const CONF *conf, char c)
 996 {
 997     return IS_NUMBER(conf, c);
 998 }
 999
1000 static int def_to_int(const CONF *conf, char c)
1001 {
1002     return c - '0';
1003 }