/* $OpenBSD: conf_def.c,v 1.33 2020/02/17 12:51:48 inoguchi Exp $ */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

/* Part of the code in here was originally in conf.c, which is now removed */

#include <stdio.h>

#include <string.h>

#include <openssl/buffer.h>

#include <openssl/conf.h>

#include <openssl/conf_api.h>

#include <openssl/err.h>

#include <openssl/lhash.h>

#include <openssl/stack.h>

#include "conf_def.h"

#define MAX_CONF_VALUE_LENGTH 65536

static char *eat_ws(CONF *conf, char *p);

static char *eat_alpha_numeric(CONF *conf, char *p);

static void clear_comments(CONF *conf, char *p);

static int str_copy(CONF *conf, char *section, char **to, char *from);

static char *scan_quote(CONF *conf, char *p);

static char *scan_dquote(CONF *conf, char *p);

#define scan_esc(conf,p)  (((IS_EOF((conf),(p)[1]))?((p)+1):((p)+2)))

static CONF *def_create(CONF_METHOD *meth);

static int def_init_default(CONF *conf);

static int def_init_WIN32(CONF *conf);

static int def_destroy(CONF *conf);

static int def_destroy_data(CONF *conf);

static int def_load(CONF *conf, const char *name, long *eline);

static int def_load_bio(CONF *conf, BIO *bp, long *eline);

static int def_dump(const CONF *conf, BIO *bp);

static int def_is_number(const CONF *conf, char c);

static int def_to_int(const CONF *conf, char c);

static CONF_METHOD default_method = {

  .name = "OpenSSL default",

  .create = def_create,

  .init = def_init_default,

  .destroy = def_destroy,

  .destroy_data = def_destroy_data,

  .load_bio = def_load_bio,

  .dump = def_dump,

  .is_number = def_is_number,

  .to_int = def_to_int,

  .load = def_load

};

static CONF_METHOD WIN32_method = {

  "WIN32",

  def_create,

  def_init_WIN32,

  def_destroy,

  def_destroy_data,

  def_load_bio,

  def_dump,

  def_is_number,

  def_to_int,

  def_load

};

CONF_METHOD *

NCONF_default(void)

{

  return &default_method;

}

CONF_METHOD *

NCONF_WIN32(void)

{

  return &WIN32_method;

}

static CONF *

def_create(CONF_METHOD *meth)

{

  CONF *ret;

  ret = malloc(sizeof(CONF) + sizeof(unsigned short *));

  if (ret)

    if (meth->init(ret) == 0) {

      free(ret);

      ret = NULL;

    }

  return ret;

}

static int

def_init_default(CONF *conf)

{

  if (conf == NULL)

    return 0;

  conf->meth = &default_method;

  conf->meth_data = CONF_type_default;

  conf->data = NULL;

  return 1;

}

static int

def_init_WIN32(CONF *conf)

{

  if (conf == NULL)

    return 0;

  conf->meth = &WIN32_method;

  conf->meth_data = (void *)CONF_type_win32;

  conf->data = NULL;

  return 1;

}

static int

def_destroy(CONF *conf)

{

  if (def_destroy_data(conf)) {

    free(conf);

    return 1;

  }

  return 0;

}

static int

def_destroy_data(CONF *conf)

{

  if (conf == NULL)

    return 0;

  _CONF_free_data(conf);

  return 1;

}

static int

def_load(CONF *conf, const char *name, long *line)

{

  int ret;

  BIO *in = NULL;

  in = BIO_new_file(name, "rb");

  if (in == NULL) {

    if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)

      CONFerror(CONF_R_NO_SUCH_FILE);

    else

      CONFerror(ERR_R_SYS_LIB);

    return 0;

  }

  ret = def_load_bio(conf, in, line);

  BIO_free(in);

  return ret;

}

static int

def_load_bio(CONF *conf, BIO *in, long *line)

{

/* The macro BUFSIZE conflicts with a system macro in VxWorks */

#define CONFBUFSIZE 512

  int bufnum = 0, i, ii;

  BUF_MEM *buff = NULL;

  char *s, *p, *end;

  int again;

  long eline = 0;

  CONF_VALUE *v = NULL, *tv;

  CONF_VALUE *sv = NULL;

  char *section = NULL, *buf;

  char *start, *psection, *pname;

  void *h = (void *)(conf->data);

  if ((buff = BUF_MEM_new()) == NULL) {

    CONFerror(ERR_R_BUF_LIB);

    goto err;

  }

  section = strdup("default");

  if (section == NULL) {

    CONFerror(ERR_R_MALLOC_FAILURE);

    goto err;

  }

  if (_CONF_new_data(conf) == 0) {

    CONFerror(ERR_R_MALLOC_FAILURE);

    goto err;

  }

  sv = _CONF_new_section(conf, section);

  if (sv == NULL) {

    CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

    goto err;

  }

  bufnum = 0;

  again = 0;

  for (;;) {

    if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {

      CONFerror(ERR_R_BUF_LIB);

      goto err;

    }

    p = &(buff->data[bufnum]);

    *p = '\0';

    BIO_gets(in, p, CONFBUFSIZE - 1);

    p[CONFBUFSIZE - 1] = '\0';

    ii = i = strlen(p);

    if (i == 0 && !again)

      break;

    again = 0;

    while (i > 0) {

      if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))

        break;

      else

        i--;

    }

    /* we removed some trailing stuff so there is a new

     * line on the end. */

    if (ii && i == ii)

      again = 1; /* long line */

    else {

      p[i] = '\0';

      eline++; /* another input line */

    }

    /* we now have a line with trailing \r\n removed */

    /* i is the number of bytes */

    bufnum += i;

    v = NULL;

    /* check for line continuation */

    if (bufnum >= 1) {

      /* If we have bytes and the last char '\\' and

       * second last char is not '\\' */

      p = &(buff->data[bufnum - 1]);

      if (IS_ESC(conf, p[0]) &&

          ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {

        bufnum--;

        again = 1;

      }

    }

    if (again)

      continue;

    bufnum = 0;

    buf = buff->data;

    clear_comments(conf, buf);

    s = eat_ws(conf, buf);

    if (IS_EOF(conf, *s))

      continue; /* blank line */

    if (*s == '[') {

      char *ss;

      s++;

      start = eat_ws(conf, s);

      ss = start;

again:

      end = eat_alpha_numeric(conf, ss);

      p = eat_ws(conf, end);

      if (*p != ']') {

        if (*p != '\0' && ss != p) {

          ss = p;

          goto again;

        }

        CONFerror(CONF_R_MISSING_CLOSE_SQUARE_BRACKET);

        goto err;

      }

      *end = '\0';

      if (!str_copy(conf, NULL, &section, start))

        goto err;

      if ((sv = _CONF_get_section(conf, section)) == NULL)

        sv = _CONF_new_section(conf, section);

      if (sv == NULL) {

        CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

        goto err;

      }

      continue;

    } else {

      pname = s;

      psection = NULL;

      end = eat_alpha_numeric(conf, s);

      if ((end[0] == ':') && (end[1] == ':')) {

        *end = '\0';

        end += 2;

        psection = pname;

        pname = end;

        end = eat_alpha_numeric(conf, end);

      }

      p = eat_ws(conf, end);

      if (*p != '=') {

        CONFerror(CONF_R_MISSING_EQUAL_SIGN);

        goto err;

      }

      *end = '\0';

      p++;

      start = eat_ws(conf, p);

      while (!IS_EOF(conf, *p))

        p++;

      p--;

      while ((p != start) && (IS_WS(conf, *p)))

        p--;

      p++;

      *p = '\0';

      if (!(v = malloc(sizeof(CONF_VALUE)))) {

        CONFerror(ERR_R_MALLOC_FAILURE);

        goto err;

      }

      if (psection == NULL)

        psection = section;

      v->name = strdup(pname);

      v->value = NULL;

      if (v->name == NULL) {

        CONFerror(ERR_R_MALLOC_FAILURE);

        goto err;

      }

      if (!str_copy(conf, psection, &(v->value), start))

        goto err;

      if (strcmp(psection, section) != 0) {

        if ((tv = _CONF_get_section(conf, psection))

          == NULL)

          tv = _CONF_new_section(conf, psection);

        if (tv == NULL) {

          CONFerror(CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

          goto err;

        }

      } else

        tv = sv;

      if (_CONF_add_string(conf, tv, v) == 0) {

        CONFerror(ERR_R_MALLOC_FAILURE);

        goto err;

      }

      v = NULL;

    }

  }

  if (buff != NULL)

    BUF_MEM_free(buff);

  free(section);

  return (1);

err:

  if (buff != NULL)

    BUF_MEM_free(buff);

  free(section);

  if (line != NULL)

    *line = eline;

  ERR_asprintf_error_data("line %ld", eline);

  if ((h != conf->data) && (conf->data != NULL)) {

    CONF_free(conf->data);

    conf->data = NULL;

  }

  if (v != NULL) {

    free(v->name);

    free(v->value);

    free(v);

  }

  return (0);

}

static void

clear_comments(CONF *conf, char *p)

{

  for (;;) {

    if (IS_FCOMMENT(conf, *p)) {

      *p = '\0';

      return;

    }

    if (!IS_WS(conf, *p)) {

      break;

    }

    p++;

  }

  for (;;) {

    if (IS_COMMENT(conf, *p)) {

      *p = '\0';

      return;

    }

    if (IS_DQUOTE(conf, *p)) {

      p = scan_dquote(conf, p);

      continue;

    }

    if (IS_QUOTE(conf, *p)) {

      p = scan_quote(conf, p);

      continue;

    }

    if (IS_ESC(conf, *p)) {

      p = scan_esc(conf, p);

      continue;

    }

    if (IS_EOF(conf, *p))

      return;

    else

      p++;

  }

}

static int

str_copy(CONF *conf, char *section, char **pto, char *from)

{

  int q, r,rr = 0, to = 0, len = 0;

  char *s, *e, *rp, *p, *rrp, *np, *cp, v;

  size_t newsize;

  BUF_MEM *buf;

  if ((buf = BUF_MEM_new()) == NULL)

    return (0);

  len = strlen(from) + 1;

  if (!BUF_MEM_grow(buf, len))

    goto err;

  for (;;) {

    if (IS_QUOTE(conf, *from)) {

      q = *from;

      from++;

      while (!IS_EOF(conf, *from) && (*from != q)) {

        if (IS_ESC(conf, *from)) {

          from++;

          if (IS_EOF(conf, *from))

            break;

        }

        buf->data[to++] = *(from++);

      }

      if (*from == q)

        from++;

    } else if (IS_DQUOTE(conf, *from)) {

      q = *from;

      from++;

      while (!IS_EOF(conf, *from)) {

        if (*from == q) {

          if (*(from + 1) == q) {

            from++;

          } else {

            break;

          }

        }

        buf->data[to++] = *(from++);

      }

      if (*from == q)

        from++;

    } else if (IS_ESC(conf, *from)) {

      from++;

      v = *(from++);

      if (IS_EOF(conf, v))

        break;

      else if (v == 'r')

        v = '\r';

      else if (v == 'n')

        v = '\n';

      else if (v == 'b')

        v = '\b';

      else if (v == 't')

        v = '\t';

      buf->data[to++] = v;

    } else if (IS_EOF(conf, *from))

      break;

    else if (*from == '$') {

      /* try to expand it */

      rrp = NULL;

      s = &(from[1]);

      if (*s == '{')

        q = '}';

      else if (*s == '(')

        q = ')';

      else

        q = 0;

      if (q)

        s++;

      cp = section;

      e = np = s;

      while (IS_ALPHA_NUMERIC(conf, *e))

        e++;

      if ((e[0] == ':') && (e[1] == ':')) {

        cp = np;

        rrp = e;

        rr = *e;

        *rrp = '\0';

        e += 2;

        np = e;

        while (IS_ALPHA_NUMERIC(conf, *e))

          e++;

      }

      r = *e;

      *e = '\0';

      rp = e;

      if (q) {

        if (r != q) {

          CONFerror(CONF_R_NO_CLOSE_BRACE);

          goto err;

        }

        e++;

      }

      /* So at this point we have

       * np which is the start of the name string which is

       *   '\0' terminated.

       * cp which is the start of the section string which is

       *   '\0' terminated.

       * e is the 'next point after'.

       * r and rr are the chars replaced by the '\0'

       * rp and rrp is where 'r' and 'rr' came from.

       */

      p = _CONF_get_string(conf, cp, np);

      if (rrp != NULL)

        *rrp = rr;

      *rp = r;

      if (p == NULL) {

        CONFerror(CONF_R_VARIABLE_HAS_NO_VALUE);

        goto err;

      }

      newsize = strlen(p) + buf->length - (e - from);

      if (newsize > MAX_CONF_VALUE_LENGTH) {

        CONFerror(CONF_R_VARIABLE_EXPANSION_TOO_LONG);

        goto err;

      }

      if (!BUF_MEM_grow_clean(buf, newsize)) {

        CONFerror(CONF_R_MODULE_INITIALIZATION_ERROR);

        goto err;

      }

      while (*p)

        buf->data[to++] = *(p++);

      /* Since we change the pointer 'from', we also have

         to change the perceived length of the string it

         points at.  /RL */

      len -= e - from;

      from = e;

      /* In case there were no braces or parenthesis around

         the variable reference, we have to put back the

         character that was replaced with a '\0'.  /RL */

      *rp = r;

    } else

      buf->data[to++] = *(from++);

  }

  buf->data[to]='\0';

  free(*pto);

  *pto = buf->data;

  free(buf);

  return (1);

err:

  if (buf != NULL)

    BUF_MEM_free(buf);

  return (0);

}

static char *

eat_ws(CONF *conf, char *p)

{

  while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))

    p++;

  return (p);

}

static char *

eat_alpha_numeric(CONF *conf, char *p)

{

  for (;;) {

    if (IS_ESC(conf, *p)) {

      p = scan_esc(conf, p);

      continue;

    }

    if (!IS_ALPHA_NUMERIC_PUNCT(conf, *p))

      return (p);

    p++;

  }

}

static char *

scan_quote(CONF *conf, char *p)

{

  int q = *p;

  p++;

  while (!(IS_EOF(conf, *p)) && (*p != q)) {

    if (IS_ESC(conf, *p)) {

      p++;

      if (IS_EOF(conf, *p))

        return (p);

    }

    p++;

  }

  if (*p == q)

    p++;

  return (p);

}

static char *

scan_dquote(CONF *conf, char *p)

{

  int q = *p;

  p++;

  while (!(IS_EOF(conf, *p))) {

    if (*p == q) {

      if (*(p + 1) == q) {

        p++;

      } else {

        break;

      }

    }

    p++;

  }

  if (*p == q)

    p++;

  return (p);

}

static void

dump_value_doall_arg(CONF_VALUE *a, BIO *out)

{

  if (a->name)

    BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);

  else

    BIO_printf(out, "[[%s]]\n", a->section);

}

static IMPLEMENT_LHASH_DOALL_ARG_FN(dump_value, CONF_VALUE, BIO)

static int

def_dump(const CONF *conf, BIO *out)

{

  lh_CONF_VALUE_doall_arg(conf->data, LHASH_DOALL_ARG_FN(dump_value),

      BIO, out);

  return 1;

}

static int

def_is_number(const CONF *conf, char c)

{

  return IS_NUMBER(conf, c);

}

static int

def_to_int(const CONF *conf, char c)

{

  return c - '0';

}