/* $OpenBSD: x509_conf.c,v 1.2 2021/11/01 20:53:08 tb Exp $ */

/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL

 * project 1999.

 */

/* ====================================================================

 * Copyright (c) 1999-2002 The OpenSSL Project.  All rights reserved.

 *

 * 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 above 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 acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED 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 OpenSSL PROJECT OR

 * ITS 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.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

/* extension creation utilities */

#include <ctype.h>

#include <stdio.h>

#include <string.h>

#include <openssl/conf.h>

#include <openssl/err.h>

#include <openssl/x509.h>

#include <openssl/x509v3.h>

#include "x509_lcl.h"

static int v3_check_critical(const char **value);

static int v3_check_generic(const char **value);

static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,

    int crit, const char *value);

static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,

    int crit, int type, X509V3_CTX *ctx);

static char *conf_lhash_get_string(void *db, const char *section,

    const char *value);

static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db,

    const char *section);

static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid,

    int crit, void *ext_struc);

static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,

    long *ext_len);

/* CONF *conf:  Config file    */

/* char *name:  Name    */

/* char *value:  Value    */

X509_EXTENSION *

X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name,

    const char *value)

{

  int crit;

  int ext_type;

  X509_EXTENSION *ret;

  crit = v3_check_critical(&value);

  if ((ext_type = v3_check_generic(&value)))

    return v3_generic_extension(name, value, crit, ext_type, ctx);

  ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);

  if (!ret) {

    X509V3error(X509V3_R_ERROR_IN_EXTENSION);

    ERR_asprintf_error_data("name=%s, value=%s", name, value);

  }

  return ret;

}

/* CONF *conf:  Config file    */

/* char *value:  Value    */

X509_EXTENSION *

X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,

    const char *value)

{

  int crit;

  int ext_type;

  crit = v3_check_critical(&value);

  if ((ext_type = v3_check_generic(&value)))

    return v3_generic_extension(OBJ_nid2sn(ext_nid),

        value, crit, ext_type, ctx);

  return do_ext_nconf(conf, ctx, ext_nid, crit, value);

}

/* CONF *conf:  Config file    */

/* char *value:  Value    */

static X509_EXTENSION *

do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid, int crit,

    const char *value)

{

  const X509V3_EXT_METHOD *method;

  X509_EXTENSION *ext;

  void *ext_struc;

  if (ext_nid == NID_undef) {

    X509V3error(X509V3_R_UNKNOWN_EXTENSION_NAME);

    return NULL;

  }

  if (!(method = X509V3_EXT_get_nid(ext_nid))) {

    X509V3error(X509V3_R_UNKNOWN_EXTENSION);

    return NULL;

  }

  /* Now get internal extension representation based on type */

  if (method->v2i) {

    STACK_OF(CONF_VALUE) *nval;

    if (*value == '@')

      nval = NCONF_get_section(conf, value + 1);

    else

      nval = X509V3_parse_list(value);

    if (sk_CONF_VALUE_num(nval) <= 0) {

      X509V3error(X509V3_R_INVALID_EXTENSION_STRING);

      ERR_asprintf_error_data("name=%s,section=%s",

          OBJ_nid2sn(ext_nid), value);

      if (*value != '@')

        sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);

      return NULL;

    }

    ext_struc = method->v2i(method, ctx, nval);

    if (*value != '@')

      sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);

  } else if (method->s2i) {

    ext_struc = method->s2i(method, ctx, value);

  } else if (method->r2i) {

    if (!ctx->db || !ctx->db_meth) {

      X509V3error(X509V3_R_NO_CONFIG_DATABASE);

      return NULL;

    }

    ext_struc = method->r2i(method, ctx, value);

  } else {

    X509V3error(X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);

    ERR_asprintf_error_data("name=%s", OBJ_nid2sn(ext_nid));

    return NULL;

  }

  if (ext_struc == NULL)

    return NULL;

  ext = do_ext_i2d(method, ext_nid, crit, ext_struc);

  if (method->it)

    ASN1_item_free(ext_struc, method->it);

  else

    method->ext_free(ext_struc);

  return ext;

}

static X509_EXTENSION *

do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid, int crit,

    void *ext_struc)

{

  unsigned char *ext_der;

  int ext_len;

  ASN1_OCTET_STRING *ext_oct = NULL;

  X509_EXTENSION *ext;

  /* Convert internal representation to DER */

  if (method->it) {

    ext_der = NULL;

    ext_len = ASN1_item_i2d(ext_struc, &ext_der,

        method->it);

    if (ext_len < 0)

      goto merr;

  } else {

    unsigned char *p;

    ext_len = method->i2d(ext_struc, NULL);

    if (!(ext_der = malloc(ext_len)))

      goto merr;

    p = ext_der;

    method->i2d(ext_struc, &p);

  }

  if (!(ext_oct = ASN1_OCTET_STRING_new()))

    goto merr;

  ext_oct->data = ext_der;

  ext_oct->length = ext_len;

  ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);

  if (!ext)

    goto merr;

  ASN1_OCTET_STRING_free(ext_oct);

  return ext;

merr:

  ASN1_OCTET_STRING_free(ext_oct);

  X509V3error(ERR_R_MALLOC_FAILURE);

  return NULL;

}

/* Given an internal structure, nid and critical flag create an extension */

X509_EXTENSION *

X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)

{

  const X509V3_EXT_METHOD *method;

  if (!(method = X509V3_EXT_get_nid(ext_nid))) {

    X509V3error(X509V3_R_UNKNOWN_EXTENSION);

    return NULL;

  }

  return do_ext_i2d(method, ext_nid, crit, ext_struc);

}

/* Check the extension string for critical flag */

static int

v3_check_critical(const char **value)

{

  const char *p = *value;

  if ((strlen(p) < 9) || strncmp(p, "critical,", 9))

    return 0;

  p += 9;

  while (isspace((unsigned char)*p)) p++;

    *value = p;

  return 1;

}

/* Check extension string for generic extension and return the type */

static int

v3_check_generic(const char **value)

{

  int gen_type = 0;

  const char *p = *value;

  if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) {

    p += 4;

    gen_type = 1;

  } else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) {

    p += 5;

    gen_type = 2;

  } else

    return 0;

  while (isspace((unsigned char)*p))

    p++;

  *value = p;

  return gen_type;

}

/* Create a generic extension: for now just handle DER type */

static X509_EXTENSION *

v3_generic_extension(const char *ext, const char *value, int crit, int gen_type,

    X509V3_CTX *ctx)

{

  unsigned char *ext_der = NULL;

  long ext_len = 0;

  ASN1_OBJECT *obj = NULL;

  ASN1_OCTET_STRING *oct = NULL;

  X509_EXTENSION *extension = NULL;

  if (!(obj = OBJ_txt2obj(ext, 0))) {

    X509V3error(X509V3_R_EXTENSION_NAME_ERROR);

    ERR_asprintf_error_data("name=%s", ext);

    goto err;

  }

  if (gen_type == 1)

    ext_der = string_to_hex(value, &ext_len);

  else if (gen_type == 2)

    ext_der = generic_asn1(value, ctx, &ext_len);

  else {

    ERR_asprintf_error_data("Unexpected generic extension type %d", gen_type);

    goto err;

  }

  if (ext_der == NULL) {

    X509V3error(X509V3_R_EXTENSION_VALUE_ERROR);

    ERR_asprintf_error_data("value=%s", value);

    goto err;

  }

  if (!(oct = ASN1_OCTET_STRING_new())) {

    X509V3error(ERR_R_MALLOC_FAILURE);

    goto err;

  }

  oct->data = ext_der;

  oct->length = ext_len;

  ext_der = NULL;

  extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);

err:

  ASN1_OBJECT_free(obj);

  ASN1_OCTET_STRING_free(oct);

  free(ext_der);

  return extension;

}

static unsigned char *

generic_asn1(const char *value, X509V3_CTX *ctx, long *ext_len)

{

  ASN1_TYPE *typ;

  unsigned char *ext_der = NULL;

  typ = ASN1_generate_v3(value, ctx);

  if (typ == NULL)

    return NULL;

  *ext_len = i2d_ASN1_TYPE(typ, &ext_der);

  ASN1_TYPE_free(typ);

  return ext_der;

}

/* This is the main function: add a bunch of extensions based on a config file

 * section to an extension STACK.

 */

int

X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section,

    STACK_OF(X509_EXTENSION) **sk)

{

  X509_EXTENSION *ext;

  STACK_OF(CONF_VALUE) *nval;

  CONF_VALUE *val;

  int i;

  if (!(nval = NCONF_get_section(conf, section)))

    return 0;

  for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {

    val = sk_CONF_VALUE_value(nval, i);

    if (!(ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)))

      return 0;

    if (sk)

      X509v3_add_ext(sk, ext, -1);

    X509_EXTENSION_free(ext);

  }

  return 1;

}

/* Convenience functions to add extensions to a certificate, CRL and request */

int

X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,

    X509 *cert)

{

  STACK_OF(X509_EXTENSION) **sk = NULL;

  if (cert)

    sk = &cert->cert_info->extensions;

  return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);

}

/* Same as above but for a CRL */

int

X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,

    X509_CRL *crl)

{

  STACK_OF(X509_EXTENSION) **sk = NULL;

  if (crl)

    sk = &crl->crl->extensions;

  return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);

}

/* Add extensions to certificate request */

int

X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,

    X509_REQ *req)

{

  STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;

  int i;

  if (req)

    sk = &extlist;

  i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);

  if (!i || !sk)

    return i;

  i = X509_REQ_add_extensions(req, extlist);

  sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);

  return i;

}

/* Config database functions */

char *

X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section)

{

  if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {

    X509V3error(X509V3_R_OPERATION_NOT_DEFINED);

    return NULL;

  }

  return ctx->db_meth->get_string(ctx->db, name, section);

}

STACK_OF(CONF_VALUE) *

X509V3_get_section(X509V3_CTX *ctx, const char *section)

{

  if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {

    X509V3error(X509V3_R_OPERATION_NOT_DEFINED);

    return NULL;

  }

  return ctx->db_meth->get_section(ctx->db, section);

}

void

X509V3_string_free(X509V3_CTX *ctx, char *str)

{

  if (!str)

    return;

  if (ctx->db_meth->free_string)

    ctx->db_meth->free_string(ctx->db, str);

}

void

X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)

{

  if (!section)

    return;

  if (ctx->db_meth->free_section)

    ctx->db_meth->free_section(ctx->db, section);

}

static char *

nconf_get_string(void *db, const char *section, const char *value)

{

  return NCONF_get_string(db, section, value);

}

static STACK_OF(CONF_VALUE) *

nconf_get_section(void *db, const char *section)

{

  return NCONF_get_section(db, section);

}

static X509V3_CONF_METHOD nconf_method = {

  nconf_get_string,

  nconf_get_section,

  NULL,

  NULL

};

void

X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)

{

  ctx->db_meth = &nconf_method;

  ctx->db = conf;

}

void

X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,

    X509_CRL *crl, int flags)

{

  ctx->issuer_cert = issuer;

  ctx->subject_cert = subj;

  ctx->crl = crl;

  ctx->subject_req = req;

  ctx->flags = flags;

}

/* Old conf compatibility functions */

X509_EXTENSION *

X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, const char *name,

    const char *value)

{

  CONF ctmp;

  CONF_set_nconf(&ctmp, conf);

  return X509V3_EXT_nconf(&ctmp, ctx, name, value);

}

/* LHASH *conf:  Config file    */

/* char *value:  Value    */

X509_EXTENSION *

X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx, int ext_nid,

    const char *value)

{

  CONF ctmp;

  CONF_set_nconf(&ctmp, conf);

  return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);

}

static char *

conf_lhash_get_string(void *db, const char *section, const char *value)

{

  return CONF_get_string(db, section, value);

}

static STACK_OF(CONF_VALUE) *

conf_lhash_get_section(void *db, const char *section)

{

  return CONF_get_section(db, section);

}

static X509V3_CONF_METHOD conf_lhash_method = {

  conf_lhash_get_string,

  conf_lhash_get_section,

  NULL,

  NULL

};

void

X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)

{

  ctx->db_meth = &conf_lhash_method;

  ctx->db = lhash;

}

int

X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,

    const char *section, X509 *cert)

{

  CONF ctmp;

  CONF_set_nconf(&ctmp, conf);

  return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);

}

/* Same as above but for a CRL */

int

X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,

    const char *section, X509_CRL *crl)

{

  CONF ctmp;

  CONF_set_nconf(&ctmp, conf);

  return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);

}

/* Add extensions to certificate request */

int

X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,

    const char *section, X509_REQ *req)

{

  CONF ctmp;

  CONF_set_nconf(&ctmp, conf);

  return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);

}