/* $OpenBSD: a_object.c,v 1.48 2022/05/13 16:32:10 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 <stdio.h>

#include <string.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/err.h>

#include <openssl/buffer.h>

#include <openssl/objects.h>

#include "asn1_locl.h"

const ASN1_ITEM ASN1_OBJECT_it = {

  .itype = ASN1_ITYPE_PRIMITIVE,

  .utype = V_ASN1_OBJECT,

  .sname = "ASN1_OBJECT",

};

ASN1_OBJECT *

ASN1_OBJECT_new(void)

{

  ASN1_OBJECT *a;

  if ((a = calloc(1, sizeof(ASN1_OBJECT))) == NULL) {

    ASN1error(ERR_R_MALLOC_FAILURE);

    return (NULL);

  }

  a->flags = ASN1_OBJECT_FLAG_DYNAMIC;

  return a;

}

void

ASN1_OBJECT_free(ASN1_OBJECT *a)

{

  if (a == NULL)

    return;

  if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_STRINGS) {

    free((void *)a->sn);

    free((void *)a->ln);

    a->sn = a->ln = NULL;

  }

  if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC_DATA) {

    freezero((void *)a->data, a->length);

    a->data = NULL;

    a->length = 0;

  }

  if (a->flags & ASN1_OBJECT_FLAG_DYNAMIC)

    free(a);

}

ASN1_OBJECT *

ASN1_OBJECT_create(int nid, unsigned char *data, int len,

    const char *sn, const char *ln)

{

  ASN1_OBJECT o;

  o.sn = sn;

  o.ln = ln;

  o.data = data;

  o.nid = nid;

  o.length = len;

  o.flags = ASN1_OBJECT_FLAG_DYNAMIC | ASN1_OBJECT_FLAG_DYNAMIC_STRINGS |

      ASN1_OBJECT_FLAG_DYNAMIC_DATA;

  return (OBJ_dup(&o));

}

static int

oid_add_arc(CBB *cbb, uint64_t arc)

{

  int started = 0;

  uint8_t val;

  int i;

  for (i = (sizeof(arc) * 8) / 7; i >= 0; i--) {

    val = (arc >> (i * 7)) & 0x7f;

    if (!started && i != 0 && val == 0)

      continue;

    if (i > 0)

      val |= 0x80;

    if (!CBB_add_u8(cbb, val))

      return 0;

    started = 1;

  }

  return 1;

}

static int

oid_parse_arc(CBS *cbs, uint64_t *out_arc)

{

  uint64_t arc = 0;

  uint8_t val;

  do {

    if (!CBS_get_u8(cbs, &val))

      return 0;

    if (arc == 0 && val == 0x80)

      return 0;

    if (out_arc != NULL && arc > (UINT64_MAX >> 7))

      return 0;

    arc = (arc << 7) | (val & 0x7f);

  } while (val & 0x80);

  if (out_arc != NULL)

    *out_arc = arc;

  return 1;

}

static int

oid_add_arc_txt(CBB *cbb, uint64_t arc, int first)

{

  const char *fmt = ".%llu";

  char s[22]; /* Digits in decimal representation of 2^64-1, plus '.' and NUL. */

  int n;

  if (first)

    fmt = "%llu";

  n = snprintf(s, sizeof(s), fmt, (unsigned long long)arc);

  if (n < 0 || (size_t)n >= sizeof(s))

    return 0;

  if (!CBB_add_bytes(cbb, s, n))

    return 0;

  return 1;

}

static int

oid_parse_arc_txt(CBS *cbs, uint64_t *out_arc, char *separator, int first)

{

  uint64_t arc = 0;

  int digits = 0;

  uint8_t val;

  if (!first) {

    if (!CBS_get_u8(cbs, &val))

      return 0;

    if ((*separator == 0 && val != '.' && val != ' ') ||

        (*separator != 0 && val != *separator)) {

      ASN1error(ASN1_R_INVALID_SEPARATOR);

      return 0;

    }

    *separator = val;

  }

  while (CBS_len(cbs) > 0) {

    if (!CBS_peek_u8(cbs, &val))

      return 0;

    if (val == '.' || val == ' ')

      break;

    if (!CBS_get_u8(cbs, &val))

      return 0;

    if (val < '0' || val > '9') {

      /* For the first arc we treat this as the separator. */

      if (first) {

        ASN1error(ASN1_R_INVALID_SEPARATOR);

        return 0;

      }

      ASN1error(ASN1_R_INVALID_DIGIT);

      return 0;

    }

    val -= '0';

    if (digits > 0 && arc == 0 && val == 0) {

      ASN1error(ASN1_R_INVALID_NUMBER);

      return 0;

    }

    digits++;

    if (arc > UINT64_MAX / 10) {

      ASN1error(ASN1_R_TOO_LONG);

      return 0;

    }

    arc = arc * 10 + val;

  }

  if (digits < 1) {

    ASN1error(ASN1_R_INVALID_NUMBER);

    return 0;

  }

  *out_arc = arc;

  return 1;

}

static int

a2c_ASN1_OBJECT_internal(CBB *cbb, CBS *cbs)

{

  uint64_t arc, si1, si2;

  char separator = 0;

  if (!oid_parse_arc_txt(cbs, &si1, &separator, 1))

    return 0;

  if (CBS_len(cbs) == 0) {

    ASN1error(ASN1_R_MISSING_SECOND_NUMBER);

    return 0;

  }

  if (!oid_parse_arc_txt(cbs, &si2, &separator, 0))

    return 0;

  /*

   * X.690 section 8.19 - the first two subidentifiers are encoded as

   * (x * 40) + y, with x being limited to [0,1,2]. The second

   * subidentifier cannot exceed 39 for x < 2.

   */

  if (si1 > 2) {

    ASN1error(ASN1_R_FIRST_NUM_TOO_LARGE);

    return 0;

  }

  if ((si1 < 2 && si2 >= 40) || si2 > UINT64_MAX - si1 * 40) {

    ASN1error(ASN1_R_SECOND_NUMBER_TOO_LARGE);

    return 0;

  }

  arc = si1 * 40 + si2;

  if (!oid_add_arc(cbb, arc))

    return 0;

  while (CBS_len(cbs) > 0) {

    if (!oid_parse_arc_txt(cbs, &arc, &separator, 0))

      return 0;

    if (!oid_add_arc(cbb, arc))

      return 0;

  }

  return 1;

}

static int

c2a_ASN1_OBJECT(CBS *cbs, CBB *cbb)

{

  uint64_t arc, si1, si2;

  /*

   * X.690 section 8.19 - the first two subidentifiers are encoded as

   * (x * 40) + y, with x being limited to [0,1,2].

   */

  if (!oid_parse_arc(cbs, &arc))

    return 0;

  if ((si1 = arc / 40) > 2)

    si1 = 2;

  si2 = arc - si1 * 40;

  if (!oid_add_arc_txt(cbb, si1, 1))

    return 0;

  if (!oid_add_arc_txt(cbb, si2, 0))

    return 0;

  while (CBS_len(cbs) > 0) {

    if (!oid_parse_arc(cbs, &arc))

      return 0;

    if (!oid_add_arc_txt(cbb, arc, 0))

      return 0;

  }

  /* NUL terminate. */

  if (!CBB_add_u8(cbb, 0))

    return 0;

  return 1;

}

int

a2d_ASN1_OBJECT(unsigned char *out, int out_len, const char *in, int in_len)

{

  uint8_t *data = NULL;

  size_t data_len;

  CBS cbs;

  CBB cbb;

  int ret = 0;

  memset(&cbb, 0, sizeof(cbb));

  if (in_len == -1)

    in_len = strlen(in);

  if (in_len <= 0)

    goto err;

  CBS_init(&cbs, in, in_len);

  if (!CBB_init(&cbb, 0))

    goto err;

  if (!a2c_ASN1_OBJECT_internal(&cbb, &cbs))

    goto err;

  if (!CBB_finish(&cbb, &data, &data_len))

    goto err;

  if (data_len > INT_MAX)

    goto err;

  if (out != NULL) {

    if (out_len <= 0 || (size_t)out_len < data_len) {

      ASN1error(ASN1_R_BUFFER_TOO_SMALL);

      goto err;

    }

    memcpy(out, data, data_len);

  }

  ret = (int)data_len;

 err:

  CBB_cleanup(&cbb);

  free(data);

  return ret;

}

static int

i2t_ASN1_OBJECT_oid(const ASN1_OBJECT *aobj, CBB *cbb)

{

  CBS cbs;

  CBS_init(&cbs, aobj->data, aobj->length);

  return c2a_ASN1_OBJECT(&cbs, cbb);

}

static int

i2t_ASN1_OBJECT_name(const ASN1_OBJECT *aobj, CBB *cbb, const char **out_name)

{

  const char *name;

  int nid;

  *out_name = NULL;

  if ((nid = OBJ_obj2nid(aobj)) == NID_undef)

    return 0;

  if ((name = OBJ_nid2ln(nid)) == NULL)

    name = OBJ_nid2sn(nid);

  if (name == NULL)

    return 0;

  *out_name = name;

  if (!CBB_add_bytes(cbb, name, strlen(name)))

    return 0;

  /* NUL terminate. */

  if (!CBB_add_u8(cbb, 0))

    return 0;

  return 1;

}

static int

i2t_ASN1_OBJECT_cbb(const ASN1_OBJECT *aobj, CBB *cbb, int no_name)

{

  const char *name;

  if (!no_name) {

    if (i2t_ASN1_OBJECT_name(aobj, cbb, &name))

      return 1;

    if (name != NULL)

      return 0;

  }

  return i2t_ASN1_OBJECT_oid(aobj, cbb);

}

int

i2t_ASN1_OBJECT_internal(const ASN1_OBJECT *aobj, char *buf, int buf_len, int no_name)

{

  uint8_t *data = NULL;

  size_t data_len;

  CBB cbb;

  int ret = 0;

  if (buf_len < 0)

    return 0;

  if (buf_len > 0)

    buf[0] = '\0';

  if (!CBB_init(&cbb, 0))

    goto err;

  if (!i2t_ASN1_OBJECT_cbb(aobj, &cbb, no_name))

    goto err;

  if (!CBB_finish(&cbb, &data, &data_len))

    goto err;

  ret = strlcpy(buf, data, buf_len);

 err:

  CBB_cleanup(&cbb);

  free(data);

  return ret;

}

int

i2t_ASN1_OBJECT(char *buf, int buf_len, const ASN1_OBJECT *aobj)

{

  return i2t_ASN1_OBJECT_internal(aobj, buf, buf_len, 0);

}

ASN1_OBJECT *

t2i_ASN1_OBJECT_internal(const char *oid)

{

  ASN1_OBJECT *aobj = NULL;

  uint8_t *data = NULL;

  size_t data_len;

  CBB cbb;

  CBS cbs;

  memset(&cbb, 0, sizeof(cbb));

  CBS_init(&cbs, oid, strlen(oid));

  if (!CBB_init(&cbb, 0))

    goto err;

  if (!a2c_ASN1_OBJECT_internal(&cbb, &cbs))

    goto err;

  if (!CBB_finish(&cbb, &data, &data_len))

    goto err;

  if (data_len > INT_MAX)

    goto err;

  if ((aobj = ASN1_OBJECT_new()) == NULL)

    goto err;

  aobj->data = data;

  aobj->length = (int)data_len;

  aobj->flags |= ASN1_OBJECT_FLAG_DYNAMIC_DATA;

  data = NULL;

 err:

  CBB_cleanup(&cbb);

  free(data);

  return aobj;

}

int

i2a_ASN1_OBJECT(BIO *bp, const ASN1_OBJECT *aobj)

{

  uint8_t *data = NULL;

  size_t data_len;

  CBB cbb;

  int ret = -1;

  if (aobj == NULL || aobj->data == NULL)

    return BIO_write(bp, "NULL", 4);

  if (!CBB_init(&cbb, 0))

    goto err;

  if (!i2t_ASN1_OBJECT_cbb(aobj, &cbb, 0)) {

    ret = BIO_write(bp, "<INVALID>", 9);

    goto err;

  }

  if (!CBB_finish(&cbb, &data, &data_len))

    goto err;

  ret = BIO_write(bp, data, strlen(data));

 err:

  CBB_cleanup(&cbb);

  free(data);

  return ret;

}

int

c2i_ASN1_OBJECT_cbs(ASN1_OBJECT **out_aobj, CBS *content)

{

  ASN1_OBJECT *aobj = NULL;

  uint8_t *data = NULL;

  size_t data_len;

  CBS cbs;

  if (out_aobj == NULL)

    goto err;

  if (*out_aobj != NULL) {

    ASN1_OBJECT_free(*out_aobj);

    *out_aobj = NULL;

  }

  /* Parse and validate OID encoding per X.690 8.19.2. */

  CBS_dup(content, &cbs);

  if (CBS_len(&cbs) == 0) {

    ASN1error(ASN1_R_INVALID_OBJECT_ENCODING);

    goto err;

  }

  while (CBS_len(&cbs) > 0) {

    if (!oid_parse_arc(&cbs, NULL)) {

      ASN1error(ASN1_R_INVALID_OBJECT_ENCODING);

      goto err;

    }

  }

  if (!CBS_stow(content, &data, &data_len))

    goto err;

  if (data_len > INT_MAX)

    goto err;

  if ((aobj = ASN1_OBJECT_new()) == NULL)

    goto err;

  aobj->data = data;

  aobj->length = (int)data_len; /* XXX - change length to size_t. */

  aobj->flags |= ASN1_OBJECT_FLAG_DYNAMIC_DATA;

  *out_aobj = aobj;

  return 1;

 err:

  ASN1_OBJECT_free(aobj);

  free(data);

  return 0;

}

ASN1_OBJECT *

c2i_ASN1_OBJECT(ASN1_OBJECT **out_aobj, const unsigned char **pp, long len)

{

  ASN1_OBJECT *aobj = NULL;

  CBS content;

  if (out_aobj != NULL) {

    ASN1_OBJECT_free(*out_aobj);

    *out_aobj = NULL;

  }

  if (len < 0) {

    ASN1error(ASN1_R_LENGTH_ERROR);

    return NULL;

  }

  CBS_init(&content, *pp, len);

  if (!c2i_ASN1_OBJECT_cbs(&aobj, &content))

    return NULL;

  *pp = CBS_data(&content);

  if (out_aobj != NULL)

    *out_aobj = aobj;

  return aobj;

}

int

i2d_ASN1_OBJECT(const ASN1_OBJECT *a, unsigned char **pp)

{

  unsigned char *p;

  int objsize;

  if ((a == NULL) || (a->data == NULL))

    return (0);

  objsize = ASN1_object_size(0, a->length, V_ASN1_OBJECT);

  if (pp == NULL)

    return objsize;

  p = *pp;

  ASN1_put_object(&p, 0, a->length, V_ASN1_OBJECT, V_ASN1_UNIVERSAL);

  memcpy(p, a->data, a->length);

  p += a->length;

  *pp = p;

  return (objsize);

}

ASN1_OBJECT *

d2i_ASN1_OBJECT(ASN1_OBJECT **out_aobj, const unsigned char **pp, long length)

{

  ASN1_OBJECT *aobj = NULL;

  uint32_t tag_number;

  CBS cbs, content;

  if (out_aobj != NULL) {

    ASN1_OBJECT_free(*out_aobj);

    *out_aobj = NULL;

  }

  if (length < 0) {

    ASN1error(ASN1_R_LENGTH_ERROR);

    return NULL;

  }

  CBS_init(&cbs, *pp, length);

  if (!asn1_get_primitive(&cbs, 0, &tag_number, &content)) {

    ASN1error(ASN1_R_BAD_OBJECT_HEADER);

    return NULL;

  }

  if (tag_number != V_ASN1_OBJECT) {

    ASN1error(ASN1_R_EXPECTING_AN_OBJECT);

    return NULL;

  }

  if (!c2i_ASN1_OBJECT_cbs(&aobj, &content))

    return NULL;

  *pp = CBS_data(&cbs);

  if (out_aobj != NULL)

    *out_aobj = aobj;

  return aobj;

}