crypto/conf/conf_def.c

   1 /*
   2  * Copyright 1995-2020 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/cryptlib.h"
  15 #include "internal/o_dir.h"
  16 #include <openssl/lhash.h>
  17 #include <openssl/conf.h>
  18 #include <openssl/conf_api.h>
  19 #include "conf_def.h"
  20 #include <openssl/buffer.h>
  21 #include <openssl/err.h>
  22 #ifndef OPENSSL_NO_POSIX_IO
  23 # include <sys/stat.h>
  24 # ifdef _WIN32
  25 #  define stat    _stat
  26 #  define strcasecmp _stricmp
  27 # endif
  28 #endif
  29
  30 DEFINE_STACK_OF(BIO)
  31
  32 #ifndef S_ISDIR
  33 # define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
  34 #endif
  35
  36 /*
  37  * The maximum length we can grow a value to after variable expansion. 64k
  38  * should be more than enough for all reasonable uses.
  39  */
  40 #define MAX_CONF_VALUE_LENGTH       65536
  41
  42 static int is_keytype(const CONF *conf, char c, unsigned short type);
  43 static char *eat_ws(CONF *conf, char *p);
  44 static void trim_ws(CONF *conf, char *start);
  45 static char *eat_alpha_numeric(CONF *conf, char *p);
  46 static void clear_comments(CONF *conf, char *p);
  47 static int str_copy(CONF *conf, char *section, char **to, char *from);
  48 static char *scan_quote(CONF *conf, char *p);
  49 static char *scan_dquote(CONF *conf, char *p);
  50 #define scan_esc(conf,p)        (((IS_EOF((conf),(p)[1]))?((p)+1):((p)+2)))
  51 #ifndef OPENSSL_NO_POSIX_IO
  52 static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
  53                             char **dirpath);
  54 static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx);
  55 #endif
  56
  57 static CONF *def_create(CONF_METHOD *meth);
  58 static int def_init_default(CONF *conf);
  59 #ifndef OPENSSL_NO_DEPRECATED_3_0
  60 static int def_init_WIN32(CONF *conf);
  61 #endif
  62 static int def_destroy(CONF *conf);
  63 static int def_destroy_data(CONF *conf);
  64 static int def_load(CONF *conf, const char *name, long *eline);
  65 static int def_load_bio(CONF *conf, BIO *bp, long *eline);
  66 static int def_dump(const CONF *conf, BIO *bp);
  67 static int def_is_number(const CONF *conf, char c);
  68 static int def_to_int(const CONF *conf, char c);
  69
  70 static CONF_METHOD default_method = {
  71     "OpenSSL default",
  72     def_create,
  73     def_init_default,
  74     def_destroy,
  75     def_destroy_data,
  76     def_load_bio,
  77     def_dump,
  78     def_is_number,
  79     def_to_int,
  80     def_load
  81 };
  82
  83 CONF_METHOD *NCONF_default(void)
  84 {
  85     return &default_method;
  86 }
  87
  88 #ifndef OPENSSL_NO_DEPRECATED_3_0
  89 static CONF_METHOD WIN32_method = {
  90     "WIN32",
  91     def_create,
  92     def_init_WIN32,
  93     def_destroy,
  94     def_destroy_data,
  95     def_load_bio,
  96     def_dump,
  97     def_is_number,
  98     def_to_int,
  99     def_load
 100 };
 101
 102 CONF_METHOD *NCONF_WIN32(void)
 103 {
 104     return &WIN32_method;
 105 }
 106 #endif
 107
 108 static CONF *def_create(CONF_METHOD *meth)
 109 {
 110     CONF *ret;
 111
 112     ret = OPENSSL_malloc(sizeof(*ret));
 113     if (ret != NULL)
 114         if (meth->init(ret) == 0) {
 115             OPENSSL_free(ret);
 116             ret = NULL;
 117         }
 118     return ret;
 119 }
 120
 121 static int def_init_default(CONF *conf)
 122 {
 123     if (conf == NULL)
 124         return 0;
 125
 126     memset(conf, 0, sizeof(*conf));
 127     conf->meth = &default_method;
 128     conf->meth_data = (void *)CONF_type_default;
 129
 130     return 1;
 131 }
 132
 133 #ifndef OPENSSL_NO_DEPRECATED_3_0
 134 static int def_init_WIN32(CONF *conf)
 135 {
 136     if (conf == NULL)
 137         return 0;
 138
 139     memset(conf, 0, sizeof(*conf));
 140     conf->meth = &WIN32_method;
 141     conf->meth_data = (void *)CONF_type_win32;
 142
 143     return 1;
 144 }
 145 #endif
 146
 147 static int def_destroy(CONF *conf)
 148 {
 149     if (def_destroy_data(conf)) {
 150         OPENSSL_free(conf);
 151         return 1;
 152     }
 153     return 0;
 154 }
 155
 156 static int def_destroy_data(CONF *conf)
 157 {
 158     if (conf == NULL)
 159         return 0;
 160     _CONF_free_data(conf);
 161     return 1;
 162 }
 163
 164 static int def_load(CONF *conf, const char *name, long *line)
 165 {
 166     int ret;
 167     BIO *in = NULL;
 168
 169 #ifdef OPENSSL_SYS_VMS
 170     in = BIO_new_file(name, "r");
 171 #else
 172     in = BIO_new_file(name, "rb");
 173 #endif
 174     if (in == NULL) {
 175         if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)
 176             CONFerr(CONF_F_DEF_LOAD, CONF_R_NO_SUCH_FILE);
 177         else
 178             CONFerr(CONF_F_DEF_LOAD, ERR_R_SYS_LIB);
 179         return 0;
 180     }
 181
 182     ret = def_load_bio(conf, in, line);
 183     BIO_free(in);
 184
 185     return ret;
 186 }
 187
 188 static int def_load_bio(CONF *conf, BIO *in, long *line)
 189 {
 190 /* The macro BUFSIZE conflicts with a system macro in VxWorks */
 191 #define CONFBUFSIZE     512
 192     int bufnum = 0, i, ii;
 193     BUF_MEM *buff = NULL;
 194     char *s, *p, *end;
 195     int again;
 196     long eline = 0;
 197     char btmp[DECIMAL_SIZE(eline) + 1];
 198     CONF_VALUE *v = NULL, *tv;
 199     CONF_VALUE *sv = NULL;
 200     char *section = NULL, *buf;
 201     char *start, *psection, *pname;
 202     void *h = (void *)(conf->data);
 203     STACK_OF(BIO) *biosk = NULL;
 204 #ifndef OPENSSL_NO_POSIX_IO
 205     char *dirpath = NULL;
 206     OPENSSL_DIR_CTX *dirctx = NULL;
 207 #endif
 208
 209     if ((buff = BUF_MEM_new()) == NULL) {
 210         CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_BUF_LIB);
 211         goto err;
 212     }
 213
 214     section = OPENSSL_strdup("default");
 215     if (section == NULL) {
 216         CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 217         goto err;
 218     }
 219
 220     if (_CONF_new_data(conf) == 0) {
 221         CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 222         goto err;
 223     }
 224
 225     sv = _CONF_new_section(conf, section);
 226     if (sv == NULL) {
 227         CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 228         goto err;
 229     }
 230
 231     bufnum = 0;
 232     again = 0;
 233     for (;;) {
 234         if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {
 235             CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_BUF_LIB);
 236             goto err;
 237         }
 238         p = &(buff->data[bufnum]);
 239         *p = '\0';
 240  read_retry:
 241         BIO_gets(in, p, CONFBUFSIZE - 1);
 242         p[CONFBUFSIZE - 1] = '\0';
 243         ii = i = strlen(p);
 244         if (i == 0 && !again) {
 245             /* the currently processed BIO is at EOF */
 246             BIO *parent;
 247
 248 #ifndef OPENSSL_NO_POSIX_IO
 249             /* continue processing with the next file from directory */
 250             if (dirctx != NULL) {
 251                 BIO *next;
 252
 253                 if ((next = get_next_file(dirpath, &dirctx)) != NULL) {
 254                     BIO_vfree(in);
 255                     in = next;
 256                     goto read_retry;
 257                 } else {
 258                     OPENSSL_free(dirpath);
 259                     dirpath = NULL;
 260                 }
 261             }
 262 #endif
 263             /* no more files in directory, continue with processing parent */
 264             if ((parent = sk_BIO_pop(biosk)) == NULL) {
 265                 /* everything processed get out of the loop */
 266                 break;
 267             } else {
 268                 BIO_vfree(in);
 269                 in = parent;
 270                 goto read_retry;
 271             }
 272         }
 273         again = 0;
 274         while (i > 0) {
 275             if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))
 276                 break;
 277             else
 278                 i--;
 279         }
 280         /*
 281          * we removed some trailing stuff so there is a new line on the end.
 282          */
 283         if (ii && i == ii)
 284             again = 1;          /* long line */
 285         else {
 286             p[i] = '\0';
 287             eline++;            /* another input line */
 288         }
 289
 290         /* we now have a line with trailing \r\n removed */
 291
 292         /* i is the number of bytes */
 293         bufnum += i;
 294
 295         v = NULL;
 296         /* check for line continuation */
 297         if (bufnum >= 1) {
 298             /*
 299              * If we have bytes and the last char '\\' and second last char
 300              * is not '\\'
 301              */
 302             p = &(buff->data[bufnum - 1]);
 303             if (IS_ESC(conf, p[0]) && ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {
 304                 bufnum--;
 305                 again = 1;
 306             }
 307         }
 308         if (again)
 309             continue;
 310         bufnum = 0;
 311         buf = buff->data;
 312
 313         clear_comments(conf, buf);
 314         s = eat_ws(conf, buf);
 315         if (IS_EOF(conf, *s))
 316             continue;           /* blank line */
 317         if (*s == '[') {
 318             char *ss;
 319
 320             s++;
 321             start = eat_ws(conf, s);
 322             ss = start;
 323  again:
 324             end = eat_alpha_numeric(conf, ss);
 325             p = eat_ws(conf, end);
 326             if (*p != ']') {
 327                 if (*p != '\0' && ss != p) {
 328                     ss = p;
 329                     goto again;
 330                 }
 331                 CONFerr(CONF_F_DEF_LOAD_BIO,
 332                         CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
 333                 goto err;
 334             }
 335             *end = '\0';
 336             if (!str_copy(conf, NULL, &section, start))
 337                 goto err;
 338             if ((sv = _CONF_get_section(conf, section)) == NULL)
 339                 sv = _CONF_new_section(conf, section);
 340             if (sv == NULL) {
 341                 CONFerr(CONF_F_DEF_LOAD_BIO,
 342                         CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 343                 goto err;
 344             }
 345             continue;
 346         } else {
 347             pname = s;
 348             end = eat_alpha_numeric(conf, s);
 349             if ((end[0] == ':') && (end[1] == ':')) {
 350                 *end = '\0';
 351                 end += 2;
 352                 psection = pname;
 353                 pname = end;
 354                 end = eat_alpha_numeric(conf, end);
 355             } else {
 356                 psection = section;
 357             }
 358             p = eat_ws(conf, end);
 359             if (strncmp(pname, ".pragma", 7) == 0
 360                 && (p != pname + 7 || *p == '=')) {
 361                 char *pval;
 362
 363                 if (*p == '=') {
 364                     p++;
 365                     p = eat_ws(conf, p);
 366                 }
 367                 trim_ws(conf, p);
 368
 369                 /* Pragma values take the form keyword:value */
 370                 pval = strchr(p, ':');
 371                 if (pval == NULL || pval == p || pval[1] == '\0') {
 372                     CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_INVALID_PRAGMA);
 373                     goto err;
 374                 }
 375
 376                 *pval++ = '\0';
 377                 trim_ws(conf, p);
 378                 pval = eat_ws(conf, pval);
 379
 380                 /*
 381                  * Known pragmas:
 382                  *
 383                  * dollarid     takes "on", "true or "off", "false"
 384                  */
 385                 if (strcmp(p, "dollarid") == 0) {
 386                     if (strcmp(pval, "on") == 0
 387                         || strcmp(pval, "true") == 0) {
 388                         conf->flag_dollarid = 1;
 389                     } else if (strcmp(pval, "off") == 0
 390                                || strcmp(pval, "false") == 0) {
 391                         conf->flag_dollarid = 0;
 392                     } else {
 393                         CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_INVALID_PRAGMA);
 394                         goto err;
 395                     }
 396                 }
 397                 /*
 398                  * We *ignore* any unknown pragma.
 399                  */
 400                 continue;
 401             } else if (strncmp(pname, ".include", 8) == 0
 402                 && (p != pname + 8 || *p == '=')) {
 403                 char *include = NULL;
 404                 BIO *next;
 405                 const char *include_dir = ossl_safe_getenv("OPENSSL_CONF_INCLUDE");
 406                 char *include_path = NULL;
 407
 408                 if (*p == '=') {
 409                     p++;
 410                     p = eat_ws(conf, p);
 411                 }
 412                 trim_ws(conf, p);
 413                 if (!str_copy(conf, psection, &include, p))
 414                     goto err;
 415
 416                 if (include_dir != NULL) {
 417                     size_t newlen = strlen(include_dir) + strlen(include) + 2;
 418
 419                     include_path = OPENSSL_malloc(newlen);
 420                     OPENSSL_strlcpy(include_path, include_dir, newlen);
 421                     OPENSSL_strlcat(include_path, "/", newlen);
 422                     OPENSSL_strlcat(include_path, include, newlen);
 423                     OPENSSL_free(include);
 424                 } else {
 425                     include_path = include;
 426                 }
 427
 428                 /* get the BIO of the included file */
 429 #ifndef OPENSSL_NO_POSIX_IO
 430                 next = process_include(include_path, &dirctx, &dirpath);
 431                 if (include_path != dirpath) {
 432                     /* dirpath will contain include in case of a directory */
 433                     OPENSSL_free(include_path);
 434                 }
 435 #else
 436                 next = BIO_new_file(include_path, "r");
 437                 OPENSSL_free(include_path);
 438 #endif
 439
 440                 if (next != NULL) {
 441                     /* push the currently processing BIO onto stack */
 442                     if (biosk == NULL) {
 443                         if ((biosk = sk_BIO_new_null()) == NULL) {
 444                             CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 445                             goto err;
 446                         }
 447                     }
 448                     if (!sk_BIO_push(biosk, in)) {
 449                         CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 450                         goto err;
 451                     }
 452                     /* continue with reading from the included BIO */
 453                     in = next;
 454                 }
 455                 continue;
 456             } else if (*p != '=') {
 457                 CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_MISSING_EQUAL_SIGN);
 458                 ERR_add_error_data(2, "HERE-->", p);
 459                 goto err;
 460             }
 461             *end = '\0';
 462             p++;
 463             start = eat_ws(conf, p);
 464             trim_ws(conf, start);
 465
 466             if ((v = OPENSSL_malloc(sizeof(*v))) == NULL) {
 467                 CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 468                 goto err;
 469             }
 470             v->name = OPENSSL_strdup(pname);
 471             v->value = NULL;
 472             if (v->name == NULL) {
 473                 CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 474                 goto err;
 475             }
 476             if (!str_copy(conf, psection, &(v->value), start))
 477                 goto err;
 478
 479             if (strcmp(psection, section) != 0) {
 480                 if ((tv = _CONF_get_section(conf, psection))
 481                     == NULL)
 482                     tv = _CONF_new_section(conf, psection);
 483                 if (tv == NULL) {
 484                     CONFerr(CONF_F_DEF_LOAD_BIO,
 485                             CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 486                     goto err;
 487                 }
 488             } else
 489                 tv = sv;
 490             if (_CONF_add_string(conf, tv, v) == 0) {
 491                 CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 492                 goto err;
 493             }
 494             v = NULL;
 495         }
 496     }
 497     BUF_MEM_free(buff);
 498     OPENSSL_free(section);
 499     /*
 500      * No need to pop, since we only get here if the stack is empty.
 501      * If this causes a BIO leak, THE ISSUE IS SOMEWHERE ELSE!
 502      */
 503     sk_BIO_free(biosk);
 504     return 1;
 505  err:
 506     BUF_MEM_free(buff);
 507     OPENSSL_free(section);
 508     /*
 509      * Since |in| is the first element of the stack and should NOT be freed
 510      * here, we cannot use sk_BIO_pop_free().  Instead, we pop and free one
 511      * BIO at a time, making sure that the last one popped isn't.
 512      */
 513     while (sk_BIO_num(biosk) > 0) {
 514         BIO *popped = sk_BIO_pop(biosk);
 515         BIO_vfree(in);
 516         in = popped;
 517     }
 518     sk_BIO_free(biosk);
 519 #ifndef OPENSSL_NO_POSIX_IO
 520     OPENSSL_free(dirpath);
 521     if (dirctx != NULL)
 522         OPENSSL_DIR_end(&dirctx);
 523 #endif
 524     if (line != NULL)
 525         *line = eline;
 526     BIO_snprintf(btmp, sizeof(btmp), "%ld", eline);
 527     ERR_add_error_data(2, "line ", btmp);
 528     if (h != conf->data) {
 529         CONF_free(conf->data);
 530         conf->data = NULL;
 531     }
 532     if (v != NULL) {
 533         OPENSSL_free(v->name);
 534         OPENSSL_free(v->value);
 535         OPENSSL_free(v);
 536     }
 537     return 0;
 538 }
 539
 540 static void clear_comments(CONF *conf, char *p)
 541 {
 542     for (;;) {
 543         if (IS_FCOMMENT(conf, *p)) {
 544             *p = '\0';
 545             return;
 546         }
 547         if (!IS_WS(conf, *p)) {
 548             break;
 549         }
 550         p++;
 551     }
 552
 553     for (;;) {
 554         if (IS_COMMENT(conf, *p)) {
 555             *p = '\0';
 556             return;
 557         }
 558         if (IS_DQUOTE(conf, *p)) {
 559             p = scan_dquote(conf, p);
 560             continue;
 561         }
 562         if (IS_QUOTE(conf, *p)) {
 563             p = scan_quote(conf, p);
 564             continue;
 565         }
 566         if (IS_ESC(conf, *p)) {
 567             p = scan_esc(conf, p);
 568             continue;
 569         }
 570         if (IS_EOF(conf, *p))
 571             return;
 572         else
 573             p++;
 574     }
 575 }
 576
 577 static int str_copy(CONF *conf, char *section, char **pto, char *from)
 578 {
 579     int q, r, rr = 0, to = 0, len = 0;
 580     char *s, *e, *rp, *p, *rrp, *np, *cp, v;
 581     BUF_MEM *buf;
 582
 583     if ((buf = BUF_MEM_new()) == NULL)
 584         return 0;
 585
 586     len = strlen(from) + 1;
 587     if (!BUF_MEM_grow(buf, len))
 588         goto err;
 589
 590     for (;;) {
 591         if (IS_QUOTE(conf, *from)) {
 592             q = *from;
 593             from++;
 594             while (!IS_EOF(conf, *from) && (*from != q)) {
 595                 if (IS_ESC(conf, *from)) {
 596                     from++;
 597                     if (IS_EOF(conf, *from))
 598                         break;
 599                 }
 600                 buf->data[to++] = *(from++);
 601             }
 602             if (*from == q)
 603                 from++;
 604         } else if (IS_DQUOTE(conf, *from)) {
 605             q = *from;
 606             from++;
 607             while (!IS_EOF(conf, *from)) {
 608                 if (*from == q) {
 609                     if (*(from + 1) == q) {
 610                         from++;
 611                     } else {
 612                         break;
 613                     }
 614                 }
 615                 buf->data[to++] = *(from++);
 616             }
 617             if (*from == q)
 618                 from++;
 619         } else if (IS_ESC(conf, *from)) {
 620             from++;
 621             v = *(from++);
 622             if (IS_EOF(conf, v))
 623                 break;
 624             else if (v == 'r')
 625                 v = '\r';
 626             else if (v == 'n')
 627                 v = '\n';
 628             else if (v == 'b')
 629                 v = '\b';
 630             else if (v == 't')
 631                 v = '\t';
 632             buf->data[to++] = v;
 633         } else if (IS_EOF(conf, *from))
 634             break;
 635         else if (*from == '$'
 636                  && (!conf->flag_dollarid
 637                      || from[1] == '{'
 638                      || from[1] == '(')) {
 639             size_t newsize;
 640
 641             /* try to expand it */
 642             rrp = NULL;
 643             s = &(from[1]);
 644             if (*s == '{')
 645                 q = '}';
 646             else if (*s == '(')
 647                 q = ')';
 648             else
 649                 q = 0;
 650
 651             if (q)
 652                 s++;
 653             cp = section;
 654             e = np = s;
 655             while (IS_ALNUM(conf, *e)
 656                    || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 657                 e++;
 658             if ((e[0] == ':') && (e[1] == ':')) {
 659                 cp = np;
 660                 rrp = e;
 661                 rr = *e;
 662                 *rrp = '\0';
 663                 e += 2;
 664                 np = e;
 665                 while (IS_ALNUM(conf, *e)
 666                        || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 667                     e++;
 668             }
 669             r = *e;
 670             *e = '\0';
 671             rp = e;
 672             if (q) {
 673                 if (r != q) {
 674                     CONFerr(CONF_F_STR_COPY, CONF_R_NO_CLOSE_BRACE);
 675                     goto err;
 676                 }
 677                 e++;
 678             }
 679             /*-
 680              * So at this point we have
 681              * np which is the start of the name string which is
 682              *   '\0' terminated.
 683              * cp which is the start of the section string which is
 684              *   '\0' terminated.
 685              * e is the 'next point after'.
 686              * r and rr are the chars replaced by the '\0'
 687              * rp and rrp is where 'r' and 'rr' came from.
 688              */
 689             p = _CONF_get_string(conf, cp, np);
 690             if (rrp != NULL)
 691                 *rrp = rr;
 692             *rp = r;
 693             if (p == NULL) {
 694                 CONFerr(CONF_F_STR_COPY, CONF_R_VARIABLE_HAS_NO_VALUE);
 695                 goto err;
 696             }
 697             newsize = strlen(p) + buf->length - (e - from);
 698             if (newsize > MAX_CONF_VALUE_LENGTH) {
 699                 CONFerr(CONF_F_STR_COPY, CONF_R_VARIABLE_EXPANSION_TOO_LONG);
 700                 goto err;
 701             }
 702             if (!BUF_MEM_grow_clean(buf, newsize)) {
 703                 CONFerr(CONF_F_STR_COPY, ERR_R_MALLOC_FAILURE);
 704                 goto err;
 705             }
 706             while (*p)
 707                 buf->data[to++] = *(p++);
 708
 709             /*
 710              * Since we change the pointer 'from', we also have to change the
 711              * perceived length of the string it points at.  /RL
 712              */
 713             len -= e - from;
 714             from = e;
 715
 716             /*
 717              * In case there were no braces or parenthesis around the
 718              * variable reference, we have to put back the character that was
 719              * replaced with a '\0'.  /RL
 720              */
 721             *rp = r;
 722         } else
 723             buf->data[to++] = *(from++);
 724     }
 725     buf->data[to] = '\0';
 726     OPENSSL_free(*pto);
 727     *pto = buf->data;
 728     OPENSSL_free(buf);
 729     return 1;
 730  err:
 731     BUF_MEM_free(buf);
 732     return 0;
 733 }
 734
 735 #ifndef OPENSSL_NO_POSIX_IO
 736 /*
 737  * Check whether included path is a directory.
 738  * Returns next BIO to process and in case of a directory
 739  * also an opened directory context and the include path.
 740  */
 741 static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
 742                             char **dirpath)
 743 {
 744     struct stat st;
 745     BIO *next;
 746
 747     if (stat(include, &st) < 0) {
 748         ERR_raise_data(ERR_LIB_SYS, errno,
 749                        "calling stat(%s)",
 750                        include);
 751         /* missing include file is not fatal error */
 752         return NULL;
 753     }
 754
 755     if (S_ISDIR(st.st_mode)) {
 756         if (*dirctx != NULL) {
 757             CONFerr(CONF_F_PROCESS_INCLUDE,
 758                     CONF_R_RECURSIVE_DIRECTORY_INCLUDE);
 759             ERR_add_error_data(1, include);
 760             return NULL;
 761         }
 762         /* a directory, load its contents */
 763         if ((next = get_next_file(include, dirctx)) != NULL)
 764             *dirpath = include;
 765         return next;
 766     }
 767
 768     next = BIO_new_file(include, "r");
 769     return next;
 770 }
 771
 772 /*
 773  * Get next file from the directory path.
 774  * Returns BIO of the next file to read and updates dirctx.
 775  */
 776 static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx)
 777 {
 778     const char *filename;
 779     size_t pathlen;
 780
 781     pathlen = strlen(path);
 782     while ((filename = OPENSSL_DIR_read(dirctx, path)) != NULL) {
 783         size_t namelen;
 784
 785         namelen = strlen(filename);
 786
 787
 788         if ((namelen > 5 && strcasecmp(filename + namelen - 5, ".conf") == 0)
 789             || (namelen > 4 && strcasecmp(filename + namelen - 4, ".cnf") == 0)) {
 790             size_t newlen;
 791             char *newpath;
 792             BIO *bio;
 793
 794             newlen = pathlen + namelen + 2;
 795             newpath = OPENSSL_zalloc(newlen);
 796             if (newpath == NULL) {
 797                 CONFerr(CONF_F_GET_NEXT_FILE, ERR_R_MALLOC_FAILURE);
 798                 break;
 799             }
 800 #ifdef OPENSSL_SYS_VMS
 801             /*
 802              * If the given path isn't clear VMS syntax,
 803              * we treat it as on Unix.
 804              */
 805             if (path[pathlen - 1] == ']'
 806                 || path[pathlen - 1] == '>'
 807                 || path[pathlen - 1] == ':') {
 808                 /* Clear VMS directory syntax, just copy as is */
 809                 OPENSSL_strlcpy(newpath, path, newlen);
 810             }
 811 #endif
 812             if (newpath[0] == '\0') {
 813                 OPENSSL_strlcpy(newpath, path, newlen);
 814                 OPENSSL_strlcat(newpath, "/", newlen);
 815             }
 816             OPENSSL_strlcat(newpath, filename, newlen);
 817
 818             bio = BIO_new_file(newpath, "r");
 819             OPENSSL_free(newpath);
 820             /* Errors when opening files are non-fatal. */
 821             if (bio != NULL)
 822                 return bio;
 823         }
 824     }
 825     OPENSSL_DIR_end(dirctx);
 826     *dirctx = NULL;
 827     return NULL;
 828 }
 829 #endif
 830
 831 static int is_keytype(const CONF *conf, char c, unsigned short type)
 832 {
 833     const unsigned short * keytypes = (const unsigned short *) conf->meth_data;
 834     unsigned char key = (unsigned char)c;
 835
 836 #ifdef CHARSET_EBCDIC
 837 # if CHAR_BIT > 8
 838     if (key > 255) {
 839         /* key is out of range for os_toascii table */
 840         return 0;
 841     }
 842 # endif
 843     /* convert key from ebcdic to ascii */
 844     key = os_toascii[key];
 845 #endif
 846
 847     if (key > 127) {
 848         /* key is not a seven bit ascii character */
 849         return 0;
 850     }
 851
 852     return (keytypes[key] & type) ? 1 : 0;
 853 }
 854
 855 static char *eat_ws(CONF *conf, char *p)
 856 {
 857     while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
 858         p++;
 859     return p;
 860 }
 861
 862 static void trim_ws(CONF *conf, char *start)
 863 {
 864     char *p = start;
 865
 866     while (!IS_EOF(conf, *p))
 867         p++;
 868     p--;
 869     while ((p >= start) && IS_WS(conf, *p))
 870         p--;
 871     p++;
 872     *p = '\0';
 873 }
 874
 875 static char *eat_alpha_numeric(CONF *conf, char *p)
 876 {
 877     for (;;) {
 878         if (IS_ESC(conf, *p)) {
 879             p = scan_esc(conf, p);
 880             continue;
 881         }
 882         if (!(IS_ALNUM_PUNCT(conf, *p)
 883               || (conf->flag_dollarid && IS_DOLLAR(conf, *p))))
 884             return p;
 885         p++;
 886     }
 887 }
 888
 889 static char *scan_quote(CONF *conf, char *p)
 890 {
 891     int q = *p;
 892
 893     p++;
 894     while (!(IS_EOF(conf, *p)) && (*p != q)) {
 895         if (IS_ESC(conf, *p)) {
 896             p++;
 897             if (IS_EOF(conf, *p))
 898                 return p;
 899         }
 900         p++;
 901     }
 902     if (*p == q)
 903         p++;
 904     return p;
 905 }
 906
 907 static char *scan_dquote(CONF *conf, char *p)
 908 {
 909     int q = *p;
 910
 911     p++;
 912     while (!(IS_EOF(conf, *p))) {
 913         if (*p == q) {
 914             if (*(p + 1) == q) {
 915                 p++;
 916             } else {
 917                 break;
 918             }
 919         }
 920         p++;
 921     }
 922     if (*p == q)
 923         p++;
 924     return p;
 925 }
 926
 927 static void dump_value_doall_arg(const CONF_VALUE *a, BIO *out)
 928 {
 929     if (a->name)
 930         BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
 931     else
 932         BIO_printf(out, "[[%s]]\n", a->section);
 933 }
 934
 935 IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, BIO);
 936
 937 static int def_dump(const CONF *conf, BIO *out)
 938 {
 939     lh_CONF_VALUE_doall_BIO(conf->data, dump_value_doall_arg, out);
 940     return 1;
 941 }
 942
 943 static int def_is_number(const CONF *conf, char c)
 944 {
 945     return IS_NUMBER(conf, c);
 946 }
 947
 948 static int def_to_int(const CONF *conf, char c)
 949 {
 950     return c - '0';
 951 }