crypto/conf/conf_def.c

   1 /*
   2  * Copyright 1995-2022 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
 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 (CHECK_AND_SKIP_PREFIX(pname, ".pragma")
 393                 && (p != pname || *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                     OPENSSL_free(conf->includedir);
 428                     if ((conf->includedir = OPENSSL_strdup(pval)) == NULL) {
 429                         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 430                         goto err;
 431                     }
 432                 }
 433
 434                 /*
 435                  * We *ignore* any unknown pragma.
 436                  */
 437                 continue;
 438             } else if (CHECK_AND_SKIP_PREFIX(pname, ".include")
 439                 && (p != pname || *p == '=')) {
 440                 char *include = NULL;
 441                 BIO *next;
 442                 const char *include_dir = ossl_safe_getenv("OPENSSL_CONF_INCLUDE");
 443                 char *include_path = NULL;
 444
 445                 if (include_dir == NULL)
 446                     include_dir = conf->includedir;
 447
 448                 if (*p == '=') {
 449                     p++;
 450                     p = eat_ws(conf, p);
 451                 }
 452                 trim_ws(conf, p);
 453                 if (!str_copy(conf, psection, &include, p))
 454                     goto err;
 455
 456                 if (include_dir != NULL && !ossl_is_absolute_path(include)) {
 457                     size_t newlen = strlen(include_dir) + strlen(include) + 2;
 458
 459                     include_path = OPENSSL_malloc(newlen);
 460                     if (include_path == NULL) {
 461                         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 462                         OPENSSL_free(include);
 463                         goto err;
 464                     }
 465
 466                     OPENSSL_strlcpy(include_path, include_dir, newlen);
 467                     if (!ossl_ends_with_dirsep(include_path))
 468                         OPENSSL_strlcat(include_path, "/", newlen);
 469                     OPENSSL_strlcat(include_path, include, newlen);
 470                     OPENSSL_free(include);
 471                 } else {
 472                     include_path = include;
 473                 }
 474
 475                 if (conf->flag_abspath
 476                         && !ossl_is_absolute_path(include_path)) {
 477                     ERR_raise(ERR_LIB_CONF, CONF_R_RELATIVE_PATH);
 478                     OPENSSL_free(include_path);
 479                     goto err;
 480                 }
 481
 482                 /* get the BIO of the included file */
 483 #ifndef OPENSSL_NO_POSIX_IO
 484                 next = process_include(include_path, &dirctx, &dirpath);
 485                 if (include_path != dirpath) {
 486                     /* dirpath will contain include in case of a directory */
 487                     OPENSSL_free(include_path);
 488                 }
 489 #else
 490                 next = BIO_new_file(include_path, "r");
 491                 OPENSSL_free(include_path);
 492 #endif
 493
 494                 if (next != NULL) {
 495                     /* push the currently processing BIO onto stack */
 496                     if (biosk == NULL) {
 497                         if ((biosk = sk_BIO_new_null()) == NULL) {
 498                             ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 499                             BIO_free(next);
 500                             goto err;
 501                         }
 502                     }
 503                     if (!sk_BIO_push(biosk, in)) {
 504                         ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 505                         BIO_free(next);
 506                         goto err;
 507                     }
 508                     /* continue with reading from the included BIO */
 509                     in = next;
 510                 }
 511                 continue;
 512             } else if (*p != '=') {
 513                 ERR_raise_data(ERR_LIB_CONF, CONF_R_MISSING_EQUAL_SIGN,
 514                                "HERE-->%s", p);
 515                 goto err;
 516             }
 517             *end = '\0';
 518             p++;
 519             start = eat_ws(conf, p);
 520             trim_ws(conf, start);
 521
 522             if ((v = OPENSSL_malloc(sizeof(*v))) == NULL) {
 523                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 524                 goto err;
 525             }
 526             v->name = OPENSSL_strdup(pname);
 527             v->value = NULL;
 528             if (v->name == NULL) {
 529                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 530                 goto err;
 531             }
 532             if (!str_copy(conf, psection, &(v->value), start))
 533                 goto err;
 534
 535             if (strcmp(psection, section) != 0) {
 536                 if ((tv = _CONF_get_section(conf, psection))
 537                     == NULL)
 538                     tv = _CONF_new_section(conf, psection);
 539                 if (tv == NULL) {
 540                     ERR_raise(ERR_LIB_CONF,
 541                               CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 542                     goto err;
 543                 }
 544             } else
 545                 tv = sv;
 546             if (_CONF_add_string(conf, tv, v) == 0) {
 547                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 548                 goto err;
 549             }
 550             v = NULL;
 551         }
 552     }
 553     BUF_MEM_free(buff);
 554     OPENSSL_free(section);
 555     /*
 556      * No need to pop, since we only get here if the stack is empty.
 557      * If this causes a BIO leak, THE ISSUE IS SOMEWHERE ELSE!
 558      */
 559     sk_BIO_free(biosk);
 560     return 1;
 561
 562  err:
 563     BUF_MEM_free(buff);
 564     OPENSSL_free(section);
 565     /*
 566      * Since |in| is the first element of the stack and should NOT be freed
 567      * here, we cannot use sk_BIO_pop_free().  Instead, we pop and free one
 568      * BIO at a time, making sure that the last one popped isn't.
 569      */
 570     while (sk_BIO_num(biosk) > 0) {
 571         BIO *popped = sk_BIO_pop(biosk);
 572         BIO_vfree(in);
 573         in = popped;
 574     }
 575     sk_BIO_free(biosk);
 576 #ifndef OPENSSL_NO_POSIX_IO
 577     OPENSSL_free(dirpath);
 578     if (dirctx != NULL)
 579         OPENSSL_DIR_end(&dirctx);
 580 #endif
 581     if (line != NULL)
 582         *line = eline;
 583     BIO_snprintf(btmp, sizeof(btmp), "%ld", eline);
 584     ERR_add_error_data(2, "line ", btmp);
 585     if (h != conf->data) {
 586         CONF_free(conf->data);
 587         conf->data = NULL;
 588     }
 589     if (v != NULL) {
 590         OPENSSL_free(v->name);
 591         OPENSSL_free(v->value);
 592         OPENSSL_free(v);
 593     }
 594     return 0;
 595 }
 596
 597 static void clear_comments(CONF *conf, char *p)
 598 {
 599     for (;;) {
 600         if (IS_FCOMMENT(conf, *p)) {
 601             *p = '\0';
 602             return;
 603         }
 604         if (!IS_WS(conf, *p)) {
 605             break;
 606         }
 607         p++;
 608     }
 609
 610     for (;;) {
 611         if (IS_COMMENT(conf, *p)) {
 612             *p = '\0';
 613             return;
 614         }
 615         if (IS_DQUOTE(conf, *p)) {
 616             p = scan_dquote(conf, p);
 617             continue;
 618         }
 619         if (IS_QUOTE(conf, *p)) {
 620             p = scan_quote(conf, p);
 621             continue;
 622         }
 623         if (IS_ESC(conf, *p)) {
 624             p = scan_esc(conf, p);
 625             continue;
 626         }
 627         if (IS_EOF(conf, *p))
 628             return;
 629         else
 630             p++;
 631     }
 632 }
 633
 634 static int str_copy(CONF *conf, char *section, char **pto, char *from)
 635 {
 636     int q, r, rr = 0, to = 0, len = 0;
 637     char *s, *e, *rp, *p, *rrp, *np, *cp, v;
 638     BUF_MEM *buf;
 639
 640     if ((buf = BUF_MEM_new()) == NULL)
 641         return 0;
 642
 643     len = strlen(from) + 1;
 644     if (!BUF_MEM_grow(buf, len))
 645         goto err;
 646
 647     for (;;) {
 648         if (IS_QUOTE(conf, *from)) {
 649             q = *from;
 650             from++;
 651             while (!IS_EOF(conf, *from) && (*from != q)) {
 652                 if (IS_ESC(conf, *from)) {
 653                     from++;
 654                     if (IS_EOF(conf, *from))
 655                         break;
 656                 }
 657                 buf->data[to++] = *(from++);
 658             }
 659             if (*from == q)
 660                 from++;
 661         } else if (IS_DQUOTE(conf, *from)) {
 662             q = *from;
 663             from++;
 664             while (!IS_EOF(conf, *from)) {
 665                 if (*from == q) {
 666                     if (*(from + 1) == q) {
 667                         from++;
 668                     } else {
 669                         break;
 670                     }
 671                 }
 672                 buf->data[to++] = *(from++);
 673             }
 674             if (*from == q)
 675                 from++;
 676         } else if (IS_ESC(conf, *from)) {
 677             from++;
 678             v = *(from++);
 679             if (IS_EOF(conf, v))
 680                 break;
 681             else if (v == 'r')
 682                 v = '\r';
 683             else if (v == 'n')
 684                 v = '\n';
 685             else if (v == 'b')
 686                 v = '\b';
 687             else if (v == 't')
 688                 v = '\t';
 689             buf->data[to++] = v;
 690         } else if (IS_EOF(conf, *from))
 691             break;
 692         else if (*from == '$'
 693                  && (!conf->flag_dollarid
 694                      || from[1] == '{'
 695                      || from[1] == '(')) {
 696             size_t newsize;
 697
 698             /* try to expand it */
 699             rrp = NULL;
 700             s = &(from[1]);
 701             if (*s == '{')
 702                 q = '}';
 703             else if (*s == '(')
 704                 q = ')';
 705             else
 706                 q = 0;
 707
 708             if (q)
 709                 s++;
 710             cp = section;
 711             e = np = s;
 712             while (IS_ALNUM(conf, *e)
 713                    || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 714                 e++;
 715             if ((e[0] == ':') && (e[1] == ':')) {
 716                 cp = np;
 717                 rrp = e;
 718                 rr = *e;
 719                 *rrp = '\0';
 720                 e += 2;
 721                 np = e;
 722                 while (IS_ALNUM(conf, *e)
 723                        || (conf->flag_dollarid && IS_DOLLAR(conf, *e)))
 724                     e++;
 725             }
 726             r = *e;
 727             *e = '\0';
 728             rp = e;
 729             if (q) {
 730                 if (r != q) {
 731                     ERR_raise(ERR_LIB_CONF, CONF_R_NO_CLOSE_BRACE);
 732                     goto err;
 733                 }
 734                 e++;
 735             }
 736             /*-
 737              * So at this point we have
 738              * np which is the start of the name string which is
 739              *   '\0' terminated.
 740              * cp which is the start of the section string which is
 741              *   '\0' terminated.
 742              * e is the 'next point after'.
 743              * r and rr are the chars replaced by the '\0'
 744              * rp and rrp is where 'r' and 'rr' came from.
 745              */
 746             p = _CONF_get_string(conf, cp, np);
 747             if (rrp != NULL)
 748                 *rrp = rr;
 749             *rp = r;
 750             if (p == NULL) {
 751                 ERR_raise(ERR_LIB_CONF, CONF_R_VARIABLE_HAS_NO_VALUE);
 752                 goto err;
 753             }
 754             newsize = strlen(p) + buf->length - (e - from);
 755             if (newsize > MAX_CONF_VALUE_LENGTH) {
 756                 ERR_raise(ERR_LIB_CONF, CONF_R_VARIABLE_EXPANSION_TOO_LONG);
 757                 goto err;
 758             }
 759             if (!BUF_MEM_grow_clean(buf, newsize)) {
 760                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 761                 goto err;
 762             }
 763             while (*p)
 764                 buf->data[to++] = *(p++);
 765
 766             /*
 767              * Since we change the pointer 'from', we also have to change the
 768              * perceived length of the string it points at.  /RL
 769              */
 770             len -= e - from;
 771             from = e;
 772
 773             /*
 774              * In case there were no braces or parenthesis around the
 775              * variable reference, we have to put back the character that was
 776              * replaced with a '\0'.  /RL
 777              */
 778             *rp = r;
 779         } else
 780             buf->data[to++] = *(from++);
 781     }
 782     buf->data[to] = '\0';
 783     OPENSSL_free(*pto);
 784     *pto = buf->data;
 785     OPENSSL_free(buf);
 786     return 1;
 787  err:
 788     BUF_MEM_free(buf);
 789     return 0;
 790 }
 791
 792 #ifndef OPENSSL_NO_POSIX_IO
 793 /*
 794  * Check whether included path is a directory.
 795  * Returns next BIO to process and in case of a directory
 796  * also an opened directory context and the include path.
 797  */
 798 static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
 799                             char **dirpath)
 800 {
 801     struct stat st;
 802     BIO *next;
 803
 804     if (stat(include, &st) < 0) {
 805         ERR_raise_data(ERR_LIB_SYS, errno, "calling stat(%s)", include);
 806         /* missing include file is not fatal error */
 807         return NULL;
 808     }
 809
 810     if (S_ISDIR(st.st_mode)) {
 811         if (*dirctx != NULL) {
 812             ERR_raise_data(ERR_LIB_CONF, CONF_R_RECURSIVE_DIRECTORY_INCLUDE,
 813                            "%s", include);
 814             return NULL;
 815         }
 816         /* a directory, load its contents */
 817         if ((next = get_next_file(include, dirctx)) != NULL)
 818             *dirpath = include;
 819         return next;
 820     }
 821
 822     next = BIO_new_file(include, "r");
 823     return next;
 824 }
 825
 826 /*
 827  * Get next file from the directory path.
 828  * Returns BIO of the next file to read and updates dirctx.
 829  */
 830 static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx)
 831 {
 832     const char *filename;
 833     size_t pathlen;
 834
 835     pathlen = strlen(path);
 836     while ((filename = OPENSSL_DIR_read(dirctx, path)) != NULL) {
 837         size_t namelen;
 838
 839         namelen = strlen(filename);
 840
 841
 842         if ((namelen > 5
 843              && OPENSSL_strcasecmp(filename + namelen - 5, ".conf") == 0)
 844             || (namelen > 4
 845                 && OPENSSL_strcasecmp(filename + namelen - 4, ".cnf") == 0)) {
 846             size_t newlen;
 847             char *newpath;
 848             BIO *bio;
 849
 850             newlen = pathlen + namelen + 2;
 851             newpath = OPENSSL_zalloc(newlen);
 852             if (newpath == NULL) {
 853                 ERR_raise(ERR_LIB_CONF, ERR_R_MALLOC_FAILURE);
 854                 break;
 855             }
 856 #ifdef OPENSSL_SYS_VMS
 857             /*
 858              * If the given path isn't clear VMS syntax,
 859              * we treat it as on Unix.
 860              */
 861             if (path[pathlen - 1] == ']'
 862                 || path[pathlen - 1] == '>'
 863                 || path[pathlen - 1] == ':') {
 864                 /* Clear VMS directory syntax, just copy as is */
 865                 OPENSSL_strlcpy(newpath, path, newlen);
 866             }
 867 #endif
 868             if (newpath[0] == '\0') {
 869                 OPENSSL_strlcpy(newpath, path, newlen);
 870                 OPENSSL_strlcat(newpath, "/", newlen);
 871             }
 872             OPENSSL_strlcat(newpath, filename, newlen);
 873
 874             bio = BIO_new_file(newpath, "r");
 875             OPENSSL_free(newpath);
 876             /* Errors when opening files are non-fatal. */
 877             if (bio != NULL)
 878                 return bio;
 879         }
 880     }
 881     OPENSSL_DIR_end(dirctx);
 882     *dirctx = NULL;
 883     return NULL;
 884 }
 885 #endif
 886
 887 static int is_keytype(const CONF *conf, char c, unsigned short type)
 888 {
 889     const unsigned short * keytypes = (const unsigned short *) conf->meth_data;
 890     unsigned char key = (unsigned char)c;
 891
 892 #ifdef CHARSET_EBCDIC
 893 # if CHAR_BIT > 8
 894     if (key > 255) {
 895         /* key is out of range for os_toascii table */
 896         return 0;
 897     }
 898 # endif
 899     /* convert key from ebcdic to ascii */
 900     key = os_toascii[key];
 901 #endif
 902
 903     if (key > 127) {
 904         /* key is not a seven bit ascii character */
 905         return 0;
 906     }
 907
 908     return (keytypes[key] & type) ? 1 : 0;
 909 }
 910
 911 static char *eat_ws(CONF *conf, char *p)
 912 {
 913     while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
 914         p++;
 915     return p;
 916 }
 917
 918 static void trim_ws(CONF *conf, char *start)
 919 {
 920     char *p = start;
 921
 922     while (!IS_EOF(conf, *p))
 923         p++;
 924     p--;
 925     while ((p >= start) && IS_WS(conf, *p))
 926         p--;
 927     p++;
 928     *p = '\0';
 929 }
 930
 931 static char *eat_alpha_numeric(CONF *conf, char *p)
 932 {
 933     for (;;) {
 934         if (IS_ESC(conf, *p)) {
 935             p = scan_esc(conf, p);
 936             continue;
 937         }
 938         if (!(IS_ALNUM_PUNCT(conf, *p)
 939               || (conf->flag_dollarid && IS_DOLLAR(conf, *p))))
 940             return p;
 941         p++;
 942     }
 943 }
 944
 945 static char *scan_quote(CONF *conf, char *p)
 946 {
 947     int q = *p;
 948
 949     p++;
 950     while (!(IS_EOF(conf, *p)) && (*p != q)) {
 951         if (IS_ESC(conf, *p)) {
 952             p++;
 953             if (IS_EOF(conf, *p))
 954                 return p;
 955         }
 956         p++;
 957     }
 958     if (*p == q)
 959         p++;
 960     return p;
 961 }
 962
 963 static char *scan_dquote(CONF *conf, char *p)
 964 {
 965     int q = *p;
 966
 967     p++;
 968     while (!(IS_EOF(conf, *p))) {
 969         if (*p == q) {
 970             if (*(p + 1) == q) {
 971                 p++;
 972             } else {
 973                 break;
 974             }
 975         }
 976         p++;
 977     }
 978     if (*p == q)
 979         p++;
 980     return p;
 981 }
 982
 983 static void dump_value_doall_arg(const CONF_VALUE *a, BIO *out)
 984 {
 985     if (a->name)
 986         BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
 987     else
 988         BIO_printf(out, "[[%s]]\n", a->section);
 989 }
 990
 991 IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, BIO);
 992
 993 static int def_dump(const CONF *conf, BIO *out)
 994 {
 995     lh_CONF_VALUE_doall_BIO(conf->data, dump_value_doall_arg, out);
 996     return 1;
 997 }
 998
 999 static int def_is_number(const CONF *conf, char c)
1000 {
1001     return IS_NUMBER(conf, c);
1002 }
1003
1004 static int def_to_int(const CONF *conf, char c)
1005 {
1006     return c - '0';
1007 }