crypto/conf/conf_def.c

   1 /* crypto/conf/conf.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 /* Part of the code in here was originally in conf.c, which is now removed */
  60
  61 #include <stdio.h>
  62 #include <string.h>
  63 #include "internal/cryptlib.h"
  64 #include <openssl/stack.h>
  65 #include <openssl/lhash.h>
  66 #include <openssl/conf.h>
  67 #include <openssl/conf_api.h>
  68 #include "conf_def.h"
  69 #include <openssl/buffer.h>
  70 #include <openssl/err.h>
  71
  72 static char *eat_ws(CONF *conf, char *p);
  73 static char *eat_alpha_numeric(CONF *conf, char *p);
  74 static void clear_comments(CONF *conf, char *p);
  75 static int str_copy(CONF *conf, char *section, char **to, char *from);
  76 static char *scan_quote(CONF *conf, char *p);
  77 static char *scan_dquote(CONF *conf, char *p);
  78 #define scan_esc(conf,p)        (((IS_EOF((conf),(p)[1]))?((p)+1):((p)+2)))
  79
  80 static CONF *def_create(CONF_METHOD *meth);
  81 static int def_init_default(CONF *conf);
  82 static int def_init_WIN32(CONF *conf);
  83 static int def_destroy(CONF *conf);
  84 static int def_destroy_data(CONF *conf);
  85 static int def_load(CONF *conf, const char *name, long *eline);
  86 static int def_load_bio(CONF *conf, BIO *bp, long *eline);
  87 static int def_dump(const CONF *conf, BIO *bp);
  88 static int def_is_number(const CONF *conf, char c);
  89 static int def_to_int(const CONF *conf, char c);
  90
  91 static CONF_METHOD default_method = {
  92     "OpenSSL default",
  93     def_create,
  94     def_init_default,
  95     def_destroy,
  96     def_destroy_data,
  97     def_load_bio,
  98     def_dump,
  99     def_is_number,
 100     def_to_int,
 101     def_load
 102 };
 103
 104 static CONF_METHOD WIN32_method = {
 105     "WIN32",
 106     def_create,
 107     def_init_WIN32,
 108     def_destroy,
 109     def_destroy_data,
 110     def_load_bio,
 111     def_dump,
 112     def_is_number,
 113     def_to_int,
 114     def_load
 115 };
 116
 117 CONF_METHOD *NCONF_default()
 118 {
 119     return &default_method;
 120 }
 121
 122 CONF_METHOD *NCONF_WIN32()
 123 {
 124     return &WIN32_method;
 125 }
 126
 127 static CONF *def_create(CONF_METHOD *meth)
 128 {
 129     CONF *ret;
 130
 131     ret = OPENSSL_malloc(sizeof(*ret));
 132     if (ret != NULL)
 133         if (meth->init(ret) == 0) {
 134             OPENSSL_free(ret);
 135             ret = NULL;
 136         }
 137     return ret;
 138 }
 139
 140 static int def_init_default(CONF *conf)
 141 {
 142     if (conf == NULL)
 143         return 0;
 144
 145     conf->meth = &default_method;
 146     conf->meth_data = (void *)CONF_type_default;
 147     conf->data = NULL;
 148
 149     return 1;
 150 }
 151
 152 static int def_init_WIN32(CONF *conf)
 153 {
 154     if (conf == NULL)
 155         return 0;
 156
 157     conf->meth = &WIN32_method;
 158     conf->meth_data = (void *)CONF_type_win32;
 159     conf->data = NULL;
 160
 161     return 1;
 162 }
 163
 164 static int def_destroy(CONF *conf)
 165 {
 166     if (def_destroy_data(conf)) {
 167         OPENSSL_free(conf);
 168         return 1;
 169     }
 170     return 0;
 171 }
 172
 173 static int def_destroy_data(CONF *conf)
 174 {
 175     if (conf == NULL)
 176         return 0;
 177     _CONF_free_data(conf);
 178     return 1;
 179 }
 180
 181 static int def_load(CONF *conf, const char *name, long *line)
 182 {
 183     int ret;
 184     BIO *in = NULL;
 185
 186 #ifdef OPENSSL_SYS_VMS
 187     in = BIO_new_file(name, "r");
 188 #else
 189     in = BIO_new_file(name, "rb");
 190 #endif
 191     if (in == NULL) {
 192         if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)
 193             CONFerr(CONF_F_DEF_LOAD, CONF_R_NO_SUCH_FILE);
 194         else
 195             CONFerr(CONF_F_DEF_LOAD, ERR_R_SYS_LIB);
 196         return 0;
 197     }
 198
 199     ret = def_load_bio(conf, in, line);
 200     BIO_free(in);
 201
 202     return ret;
 203 }
 204
 205 static int def_load_bio(CONF *conf, BIO *in, long *line)
 206 {
 207 /* The macro BUFSIZE conflicts with a system macro in VxWorks */
 208 #define CONFBUFSIZE     512
 209     int bufnum = 0, i, ii;
 210     BUF_MEM *buff = NULL;
 211     char *s, *p, *end;
 212     int again;
 213     long eline = 0;
 214     char btmp[DECIMAL_SIZE(eline) + 1];
 215     CONF_VALUE *v = NULL, *tv;
 216     CONF_VALUE *sv = NULL;
 217     char *section = NULL, *buf;
 218     char *start, *psection, *pname;
 219     void *h = (void *)(conf->data);
 220
 221     if ((buff = BUF_MEM_new()) == NULL) {
 222         CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_BUF_LIB);
 223         goto err;
 224     }
 225
 226     section = OPENSSL_strdup("default");
 227     if (section == NULL) {
 228         CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 229         goto err;
 230     }
 231
 232     if (_CONF_new_data(conf) == 0) {
 233         CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 234         goto err;
 235     }
 236
 237     sv = _CONF_new_section(conf, section);
 238     if (sv == NULL) {
 239         CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 240         goto err;
 241     }
 242
 243     bufnum = 0;
 244     again = 0;
 245     for (;;) {
 246         if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {
 247             CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_BUF_LIB);
 248             goto err;
 249         }
 250         p = &(buff->data[bufnum]);
 251         *p = '\0';
 252         BIO_gets(in, p, CONFBUFSIZE - 1);
 253         p[CONFBUFSIZE - 1] = '\0';
 254         ii = i = strlen(p);
 255         if (i == 0 && !again)
 256             break;
 257         again = 0;
 258         while (i > 0) {
 259             if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))
 260                 break;
 261             else
 262                 i--;
 263         }
 264         /*
 265          * we removed some trailing stuff so there is a new line on the end.
 266          */
 267         if (ii && i == ii)
 268             again = 1;          /* long line */
 269         else {
 270             p[i] = '\0';
 271             eline++;            /* another input line */
 272         }
 273
 274         /* we now have a line with trailing \r\n removed */
 275
 276         /* i is the number of bytes */
 277         bufnum += i;
 278
 279         v = NULL;
 280         /* check for line continuation */
 281         if (bufnum >= 1) {
 282             /*
 283              * If we have bytes and the last char '\\' and second last char
 284              * is not '\\'
 285              */
 286             p = &(buff->data[bufnum - 1]);
 287             if (IS_ESC(conf, p[0]) && ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {
 288                 bufnum--;
 289                 again = 1;
 290             }
 291         }
 292         if (again)
 293             continue;
 294         bufnum = 0;
 295         buf = buff->data;
 296
 297         clear_comments(conf, buf);
 298         s = eat_ws(conf, buf);
 299         if (IS_EOF(conf, *s))
 300             continue;           /* blank line */
 301         if (*s == '[') {
 302             char *ss;
 303
 304             s++;
 305             start = eat_ws(conf, s);
 306             ss = start;
 307  again:
 308             end = eat_alpha_numeric(conf, ss);
 309             p = eat_ws(conf, end);
 310             if (*p != ']') {
 311                 if (*p != '\0' && ss != p) {
 312                     ss = p;
 313                     goto again;
 314                 }
 315                 CONFerr(CONF_F_DEF_LOAD_BIO,
 316                         CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
 317                 goto err;
 318             }
 319             *end = '\0';
 320             if (!str_copy(conf, NULL, &section, start))
 321                 goto err;
 322             if ((sv = _CONF_get_section(conf, section)) == NULL)
 323                 sv = _CONF_new_section(conf, section);
 324             if (sv == NULL) {
 325                 CONFerr(CONF_F_DEF_LOAD_BIO,
 326                         CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 327                 goto err;
 328             }
 329             continue;
 330         } else {
 331             pname = s;
 332             psection = NULL;
 333             end = eat_alpha_numeric(conf, s);
 334             if ((end[0] == ':') && (end[1] == ':')) {
 335                 *end = '\0';
 336                 end += 2;
 337                 psection = pname;
 338                 pname = end;
 339                 end = eat_alpha_numeric(conf, end);
 340             }
 341             p = eat_ws(conf, end);
 342             if (*p != '=') {
 343                 CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_MISSING_EQUAL_SIGN);
 344                 goto err;
 345             }
 346             *end = '\0';
 347             p++;
 348             start = eat_ws(conf, p);
 349             while (!IS_EOF(conf, *p))
 350                 p++;
 351             p--;
 352             while ((p != start) && (IS_WS(conf, *p)))
 353                 p--;
 354             p++;
 355             *p = '\0';
 356
 357             if ((v = OPENSSL_malloc(sizeof(*v))) == NULL) {
 358                 CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 359                 goto err;
 360             }
 361             if (psection == NULL)
 362                 psection = section;
 363             v->name = OPENSSL_malloc(strlen(pname) + 1);
 364             v->value = NULL;
 365             if (v->name == NULL) {
 366                 CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 367                 goto err;
 368             }
 369             OPENSSL_strlcpy(v->name, pname, strlen(pname) + 1);
 370             if (!str_copy(conf, psection, &(v->value), start))
 371                 goto err;
 372
 373             if (strcmp(psection, section) != 0) {
 374                 if ((tv = _CONF_get_section(conf, psection))
 375                     == NULL)
 376                     tv = _CONF_new_section(conf, psection);
 377                 if (tv == NULL) {
 378                     CONFerr(CONF_F_DEF_LOAD_BIO,
 379                             CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
 380                     goto err;
 381                 }
 382             } else
 383                 tv = sv;
 384             if (_CONF_add_string(conf, tv, v) == 0) {
 385                 CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
 386                 goto err;
 387             }
 388             v = NULL;
 389         }
 390     }
 391     BUF_MEM_free(buff);
 392     OPENSSL_free(section);
 393     return (1);
 394  err:
 395     BUF_MEM_free(buff);
 396     OPENSSL_free(section);
 397     if (line != NULL)
 398         *line = eline;
 399     BIO_snprintf(btmp, sizeof btmp, "%ld", eline);
 400     ERR_add_error_data(2, "line ", btmp);
 401     if (h != conf->data) {
 402         CONF_free(conf->data);
 403         conf->data = NULL;
 404     }
 405     if (v != NULL) {
 406         OPENSSL_free(v->name);
 407         OPENSSL_free(v->value);
 408         OPENSSL_free(v);
 409     }
 410     return (0);
 411 }
 412
 413 static void clear_comments(CONF *conf, char *p)
 414 {
 415     for (;;) {
 416         if (IS_FCOMMENT(conf, *p)) {
 417             *p = '\0';
 418             return;
 419         }
 420         if (!IS_WS(conf, *p)) {
 421             break;
 422         }
 423         p++;
 424     }
 425
 426     for (;;) {
 427         if (IS_COMMENT(conf, *p)) {
 428             *p = '\0';
 429             return;
 430         }
 431         if (IS_DQUOTE(conf, *p)) {
 432             p = scan_dquote(conf, p);
 433             continue;
 434         }
 435         if (IS_QUOTE(conf, *p)) {
 436             p = scan_quote(conf, p);
 437             continue;
 438         }
 439         if (IS_ESC(conf, *p)) {
 440             p = scan_esc(conf, p);
 441             continue;
 442         }
 443         if (IS_EOF(conf, *p))
 444             return;
 445         else
 446             p++;
 447     }
 448 }
 449
 450 static int str_copy(CONF *conf, char *section, char **pto, char *from)
 451 {
 452     int q, r, rr = 0, to = 0, len = 0;
 453     char *s, *e, *rp, *p, *rrp, *np, *cp, v;
 454     BUF_MEM *buf;
 455
 456     if ((buf = BUF_MEM_new()) == NULL)
 457         return (0);
 458
 459     len = strlen(from) + 1;
 460     if (!BUF_MEM_grow(buf, len))
 461         goto err;
 462
 463     for (;;) {
 464         if (IS_QUOTE(conf, *from)) {
 465             q = *from;
 466             from++;
 467             while (!IS_EOF(conf, *from) && (*from != q)) {
 468                 if (IS_ESC(conf, *from)) {
 469                     from++;
 470                     if (IS_EOF(conf, *from))
 471                         break;
 472                 }
 473                 buf->data[to++] = *(from++);
 474             }
 475             if (*from == q)
 476                 from++;
 477         } else if (IS_DQUOTE(conf, *from)) {
 478             q = *from;
 479             from++;
 480             while (!IS_EOF(conf, *from)) {
 481                 if (*from == q) {
 482                     if (*(from + 1) == q) {
 483                         from++;
 484                     } else {
 485                         break;
 486                     }
 487                 }
 488                 buf->data[to++] = *(from++);
 489             }
 490             if (*from == q)
 491                 from++;
 492         } else if (IS_ESC(conf, *from)) {
 493             from++;
 494             v = *(from++);
 495             if (IS_EOF(conf, v))
 496                 break;
 497             else if (v == 'r')
 498                 v = '\r';
 499             else if (v == 'n')
 500                 v = '\n';
 501             else if (v == 'b')
 502                 v = '\b';
 503             else if (v == 't')
 504                 v = '\t';
 505             buf->data[to++] = v;
 506         } else if (IS_EOF(conf, *from))
 507             break;
 508         else if (*from == '$') {
 509             /* try to expand it */
 510             rrp = NULL;
 511             s = &(from[1]);
 512             if (*s == '{')
 513                 q = '}';
 514             else if (*s == '(')
 515                 q = ')';
 516             else
 517                 q = 0;
 518
 519             if (q)
 520                 s++;
 521             cp = section;
 522             e = np = s;
 523             while (IS_ALPHA_NUMERIC(conf, *e))
 524                 e++;
 525             if ((e[0] == ':') && (e[1] == ':')) {
 526                 cp = np;
 527                 rrp = e;
 528                 rr = *e;
 529                 *rrp = '\0';
 530                 e += 2;
 531                 np = e;
 532                 while (IS_ALPHA_NUMERIC(conf, *e))
 533                     e++;
 534             }
 535             r = *e;
 536             *e = '\0';
 537             rp = e;
 538             if (q) {
 539                 if (r != q) {
 540                     CONFerr(CONF_F_STR_COPY, CONF_R_NO_CLOSE_BRACE);
 541                     goto err;
 542                 }
 543                 e++;
 544             }
 545             /*-
 546              * So at this point we have
 547              * np which is the start of the name string which is
 548              *   '\0' terminated.
 549              * cp which is the start of the section string which is
 550              *   '\0' terminated.
 551              * e is the 'next point after'.
 552              * r and rr are the chars replaced by the '\0'
 553              * rp and rrp is where 'r' and 'rr' came from.
 554              */
 555             p = _CONF_get_string(conf, cp, np);
 556             if (rrp != NULL)
 557                 *rrp = rr;
 558             *rp = r;
 559             if (p == NULL) {
 560                 CONFerr(CONF_F_STR_COPY, CONF_R_VARIABLE_HAS_NO_VALUE);
 561                 goto err;
 562             }
 563             if (!BUF_MEM_grow_clean(buf,
 564                         (strlen(p) + buf->length - (e - from)))) {
 565                 CONFerr(CONF_F_STR_COPY, ERR_R_MALLOC_FAILURE);
 566                 goto err;
 567             }
 568             while (*p)
 569                 buf->data[to++] = *(p++);
 570
 571             /*
 572              * Since we change the pointer 'from', we also have to change the
 573              * perceived length of the string it points at.  /RL
 574              */
 575             len -= e - from;
 576             from = e;
 577
 578             /*
 579              * In case there were no braces or parenthesis around the
 580              * variable reference, we have to put back the character that was
 581              * replaced with a '\0'.  /RL
 582              */
 583             *rp = r;
 584         } else
 585             buf->data[to++] = *(from++);
 586     }
 587     buf->data[to] = '\0';
 588     OPENSSL_free(*pto);
 589     *pto = buf->data;
 590     OPENSSL_free(buf);
 591     return (1);
 592  err:
 593     BUF_MEM_free(buf);
 594     return (0);
 595 }
 596
 597 static char *eat_ws(CONF *conf, char *p)
 598 {
 599     while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
 600         p++;
 601     return (p);
 602 }
 603
 604 static char *eat_alpha_numeric(CONF *conf, char *p)
 605 {
 606     for (;;) {
 607         if (IS_ESC(conf, *p)) {
 608             p = scan_esc(conf, p);
 609             continue;
 610         }
 611         if (!IS_ALPHA_NUMERIC_PUNCT(conf, *p))
 612             return (p);
 613         p++;
 614     }
 615 }
 616
 617 static char *scan_quote(CONF *conf, char *p)
 618 {
 619     int q = *p;
 620
 621     p++;
 622     while (!(IS_EOF(conf, *p)) && (*p != q)) {
 623         if (IS_ESC(conf, *p)) {
 624             p++;
 625             if (IS_EOF(conf, *p))
 626                 return (p);
 627         }
 628         p++;
 629     }
 630     if (*p == q)
 631         p++;
 632     return (p);
 633 }
 634
 635 static char *scan_dquote(CONF *conf, char *p)
 636 {
 637     int q = *p;
 638
 639     p++;
 640     while (!(IS_EOF(conf, *p))) {
 641         if (*p == q) {
 642             if (*(p + 1) == q) {
 643                 p++;
 644             } else {
 645                 break;
 646             }
 647         }
 648         p++;
 649     }
 650     if (*p == q)
 651         p++;
 652     return (p);
 653 }
 654
 655 static void dump_value_doall_arg(CONF_VALUE *a, BIO *out)
 656 {
 657     if (a->name)
 658         BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
 659     else
 660         BIO_printf(out, "[[%s]]\n", a->section);
 661 }
 662
 663 static IMPLEMENT_LHASH_DOALL_ARG_FN(dump_value, CONF_VALUE, BIO)
 664
 665 static int def_dump(const CONF *conf, BIO *out)
 666 {
 667     lh_CONF_VALUE_doall_arg(conf->data, LHASH_DOALL_ARG_FN(dump_value),
 668                             BIO, out);
 669     return 1;
 670 }
 671
 672 static int def_is_number(const CONF *conf, char c)
 673 {
 674     return IS_NUMBER(conf, c);
 675 }
 676
 677 static int def_to_int(const CONF *conf, char c)
 678 {
 679     return c - '0';
 680 }