/* $OpenBSD: a_string.c,v 1.11 2022/05/20 08:04:21 tb 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.]

 */

#include <limits.h>

#include <stdlib.h>

#include <string.h>

#include <openssl/asn1.h>

#include <openssl/err.h>

#include "asn1_locl.h"

ASN1_STRING *

ASN1_STRING_new(void)

{

  return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);

}

ASN1_STRING *

ASN1_STRING_type_new(int type)

{

  ASN1_STRING *astr;

  if ((astr = calloc(1, sizeof(ASN1_STRING))) == NULL) {

    ASN1error(ERR_R_MALLOC_FAILURE);

    return NULL;

  }

  astr->type = type;

  return astr;

}

static void

ASN1_STRING_clear(ASN1_STRING *astr)

{

  if (!(astr->flags & ASN1_STRING_FLAG_NDEF))

    freezero(astr->data, astr->length);

  astr->flags &= ~ASN1_STRING_FLAG_NDEF;

  astr->data = NULL;

  astr->length = 0;

}

void

ASN1_STRING_free(ASN1_STRING *astr)

{

  if (astr == NULL)

    return;

  ASN1_STRING_clear(astr);

  free(astr);

}

int

ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)

{

  int cmp;

  if (a == NULL || b == NULL)

    return -1;

  if ((cmp = (a->length - b->length)) != 0)

    return cmp;

  if ((cmp = memcmp(a->data, b->data, a->length)) != 0)

    return cmp;

  return (a->type - b->type);

}

int

ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *src)

{

  if (src == NULL)

    return 0;

  if (!ASN1_STRING_set(dst, src->data, src->length))

    return 0;

  dst->type = src->type;

  dst->flags = src->flags & ~ASN1_STRING_FLAG_NDEF;

  return 1;

}

ASN1_STRING *

ASN1_STRING_dup(const ASN1_STRING *src)

{

  ASN1_STRING *astr;

  if (src == NULL)

    return NULL;

  if ((astr = ASN1_STRING_new()) == NULL)

    return NULL;

  if (!ASN1_STRING_copy(astr, src)) {

    ASN1_STRING_free(astr);

    return NULL;

  }

  return astr;

}

int

ASN1_STRING_set(ASN1_STRING *astr, const void *_data, int len)

{

  const char *data = _data;

  if (len == -1) {

    size_t slen;

    if (data == NULL)

      return 0;

    if ((slen = strlen(data)) > INT_MAX)

      return 0;

    len = (int)slen;

  }

  ASN1_STRING_clear(astr);

  if (len < 0 || len >= INT_MAX)

    return 0;

  if ((astr->data = calloc(1, len + 1)) == NULL) {

    ASN1error(ERR_R_MALLOC_FAILURE);

    return (0);

  }

  astr->length = len;

  if (data != NULL) {

    memcpy(astr->data, data, len);

    astr->data[len] = '\0';

  }

  return 1;

}

void

ASN1_STRING_set0(ASN1_STRING *astr, void *data, int len)

{

  ASN1_STRING_clear(astr);

  astr->data = data;

  astr->length = len;

}

void

asn1_add_error(const unsigned char *address, int offset)

{

  ERR_asprintf_error_data("offset=%d", offset);

}

int

ASN1_STRING_length(const ASN1_STRING *astr)

{

  return astr->length;

}

void

ASN1_STRING_length_set(ASN1_STRING *astr, int len)

{

  /* This is dangerous and unfixable. */

  astr->length = len;

}

int

ASN1_STRING_type(const ASN1_STRING *astr)

{

  return astr->type;

}

unsigned char *

ASN1_STRING_data(ASN1_STRING *astr)

{

  return astr->data;

}

const unsigned char *

ASN1_STRING_get0_data(const ASN1_STRING *astr)

{

  return astr->data;

}

int

ASN1_STRING_print(BIO *bp, const ASN1_STRING *astr)

{

  int i, n;

  char buf[80];

  const char *p;

  if (astr == NULL)

    return 0;

  n = 0;

  p = (const char *)astr->data;

  for (i = 0; i < astr->length; i++) {

    if ((p[i] > '~') || ((p[i] < ' ') &&

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

      buf[n] = '.';

    else

      buf[n] = p[i];

    n++;

    if (n >= 80) {

      if (BIO_write(bp, buf, n) <= 0)

        return 0;

      n = 0;

    }

  }

  if (n > 0) {

    if (BIO_write(bp, buf, n) <= 0)

      return 0;

  }

  return 1;

}

/*

 * Utility function: convert any string type to UTF8, returns number of bytes

 * in output string or a negative error code

 */

int

ASN1_STRING_to_UTF8(unsigned char **out, const ASN1_STRING *in)

{

  ASN1_STRING *astr = NULL;

  int mbflag;

  int ret = -1;

  /*

   * XXX We can't fail on *out != NULL here since things like haproxy and

   * grpc pass in a pointer to an uninitialized pointer on the stack.

   */

  if (out == NULL)

    goto err;

  if (in == NULL)

    goto err;

  if ((mbflag = asn1_tag2charwidth(in->type)) == -1)

    goto err;

  mbflag |= MBSTRING_FLAG;

  if ((ret = ASN1_mbstring_copy(&astr, in->data, in->length, mbflag,

      B_ASN1_UTF8STRING)) < 0)

    goto err;

  *out = astr->data;

  ret = astr->length;

  astr->data = NULL;

  astr->length = 0;

 err:

  ASN1_STRING_free(astr);

  return ret;

}

int

i2a_ASN1_STRING(BIO *bp, const ASN1_STRING *astr, int type)

{

  int i, n = 0;

  static const char h[] = "0123456789ABCDEF";

  char buf[2];

  if (astr == NULL)

    return 0;

  if (astr->length == 0) {

    if (BIO_write(bp, "0", 1) != 1)

      goto err;

    n = 1;

  } else {

    for (i = 0; i < astr->length; i++) {

      if ((i != 0) && (i % 35 == 0)) {

        if (BIO_write(bp, "\\\n", 2) != 2)

          goto err;

        n += 2;

      }

      buf[0] = h[((unsigned char)astr->data[i] >> 4) & 0x0f];

      buf[1] = h[((unsigned char)astr->data[i]) & 0x0f];

      if (BIO_write(bp, buf, 2) != 2)

        goto err;

      n += 2;

    }

  }

  return n;

 err:

  return -1;

}

int

a2i_ASN1_STRING(BIO *bp, ASN1_STRING *astr, char *buf, int size)

{

  int ret = 0;

  int i, j, k, m, n, again, bufsize;

  unsigned char *s = NULL, *sp;

  unsigned char *bufp;

  int first = 1;

  size_t num = 0, slen = 0;

  bufsize = BIO_gets(bp, buf, size);

  for (;;) {

    if (bufsize < 1) {

      if (first)

        break;

      else

        goto err_sl;

    }

    first = 0;

    i = bufsize;

    if (buf[i-1] == '\n')

      buf[--i] = '\0';

    if (i == 0)

      goto err_sl;

    if (buf[i-1] == '\r')

      buf[--i] = '\0';

    if (i == 0)

      goto err_sl;

    if (buf[i - 1] == '\\') {

      i--;

      again = 1;

    } else

      again = 0;

    buf[i] = '\0';

    if (i < 2)

      goto err_sl;

    bufp = (unsigned char *)buf;

    k = 0;

    if (i % 2 != 0) {

      ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);

      goto err;

    }

    i /= 2;

    if (num + i > slen) {

      sp = realloc(s, num + i);

      if (sp == NULL) {

        ASN1error(ERR_R_MALLOC_FAILURE);

        goto err;

      }

      s = sp;

      slen = num + i;

    }

    for (j = 0; j < i; j++, k += 2) {

      for (n = 0; n < 2; n++) {

        m = bufp[k + n];

        if ((m >= '0') && (m <= '9'))

          m -= '0';

        else if ((m >= 'a') && (m <= 'f'))

          m = m - 'a' + 10;

        else if ((m >= 'A') && (m <= 'F'))

          m = m - 'A' + 10;

        else {

          ASN1error(ASN1_R_NON_HEX_CHARACTERS);

          goto err;

        }

        s[num + j] <<= 4;

        s[num + j] |= m;

      }

    }

    num += i;

    if (again)

      bufsize = BIO_gets(bp, buf, size);

    else

      break;

  }

  astr->length = num;

  astr->data = s;

  return 1;

 err_sl:

  ASN1error(ASN1_R_SHORT_LINE);

 err:

  free(s);

  return ret;

}