/*

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

 * project.

 */

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

 * Copyright (c) 1999-2003 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). */

#include <stdio.h>

#include <string.h>

#include <openssl/conf.h>

#include <openssl/err.h>

#include <openssl/mem.h>

#include <openssl/obj.h>

#include <openssl/x509v3.h>

#include "../x509/internal.h"

#include "internal.h"

static void *v2i_subject_alt(const X509V3_EXT_METHOD *method,

                             const X509V3_CTX *ctx,

                             const STACK_OF(CONF_VALUE) *nval);

static void *v2i_issuer_alt(const X509V3_EXT_METHOD *method,

                            const X509V3_CTX *ctx,

                            const STACK_OF(CONF_VALUE) *nval);

static int copy_email(const X509V3_CTX *ctx, GENERAL_NAMES *gens, int move_p);

static int copy_issuer(const X509V3_CTX *ctx, GENERAL_NAMES *gens);

static int do_othername(GENERAL_NAME *gen, const char *value,

                        const X509V3_CTX *ctx);

static int do_dirname(GENERAL_NAME *gen, const char *value,

                      const X509V3_CTX *ctx);

static STACK_OF(CONF_VALUE) *i2v_GENERAL_NAMES_cb(

    const X509V3_EXT_METHOD *method, void *ext, STACK_OF(CONF_VALUE) *ret) {

  return i2v_GENERAL_NAMES(method, ext, ret);

}

const X509V3_EXT_METHOD v3_alt[] = {

    {NID_subject_alt_name, 0, ASN1_ITEM_ref(GENERAL_NAMES), 0, 0, 0, 0, 0, 0,

     i2v_GENERAL_NAMES_cb, v2i_subject_alt, NULL, NULL, NULL},

    {NID_issuer_alt_name, 0, ASN1_ITEM_ref(GENERAL_NAMES), 0, 0, 0, 0, 0, 0,

     i2v_GENERAL_NAMES_cb, v2i_issuer_alt, NULL, NULL, NULL},

    {NID_certificate_issuer, 0, ASN1_ITEM_ref(GENERAL_NAMES), 0, 0, 0, 0, 0, 0,

     i2v_GENERAL_NAMES_cb, NULL, NULL, NULL, NULL},

};

STACK_OF(CONF_VALUE) *i2v_GENERAL_NAMES(const X509V3_EXT_METHOD *method,

                                        const GENERAL_NAMES *gens,

                                        STACK_OF(CONF_VALUE) *ret) {

  int ret_was_null = ret == NULL;

  for (size_t i = 0; i < sk_GENERAL_NAME_num(gens); i++) {

    const GENERAL_NAME *gen = sk_GENERAL_NAME_value(gens, i);

    STACK_OF(CONF_VALUE) *tmp = i2v_GENERAL_NAME(method, gen, ret);

    if (tmp == NULL) {

      if (ret_was_null) {

        sk_CONF_VALUE_pop_free(ret, X509V3_conf_free);

      }

      return NULL;

    }

    ret = tmp;

  }

  if (!ret) {

    return sk_CONF_VALUE_new_null();

  }

  return ret;

}

STACK_OF(CONF_VALUE) *i2v_GENERAL_NAME(const X509V3_EXT_METHOD *method,

                                       const GENERAL_NAME *gen,

                                       STACK_OF(CONF_VALUE) *ret) {

  // Note the error-handling for this function relies on there being at most

  // one |X509V3_add_value| call. If there were two and the second failed, we

  // would need to sometimes free the first call's result.

  unsigned char *p;

  char oline[256], htmp[5];

  int i;

  switch (gen->type) {

    case GEN_OTHERNAME:

      if (!X509V3_add_value("othername", "<unsupported>", &ret)) {

        return NULL;

      }

      break;

    case GEN_X400:

      if (!X509V3_add_value("X400Name", "<unsupported>", &ret)) {

        return NULL;

      }

      break;

    case GEN_EDIPARTY:

      if (!X509V3_add_value("EdiPartyName", "<unsupported>", &ret)) {

        return NULL;

      }

      break;

    case GEN_EMAIL:

      if (!x509V3_add_value_asn1_string("email", gen->d.ia5, &ret)) {

        return NULL;

      }

      break;

    case GEN_DNS:

      if (!x509V3_add_value_asn1_string("DNS", gen->d.ia5, &ret)) {

        return NULL;

      }

      break;

    case GEN_URI:

      if (!x509V3_add_value_asn1_string("URI", gen->d.ia5, &ret)) {

        return NULL;

      }

      break;

    case GEN_DIRNAME:

      if (X509_NAME_oneline(gen->d.dirn, oline, 256) == NULL ||

          !X509V3_add_value("DirName", oline, &ret)) {

        return NULL;

      }

      break;

    case GEN_IPADD:

      p = gen->d.ip->data;

      if (gen->d.ip->length == 4) {

        BIO_snprintf(oline, sizeof(oline), "%d.%d.%d.%d", p[0], p[1], p[2],

                     p[3]);

      } else if (gen->d.ip->length == 16) {

        oline[0] = 0;

        for (i = 0; i < 8; i++) {

          uint16_t v = ((uint16_t)p[0] << 8) | p[1];

          BIO_snprintf(htmp, sizeof(htmp), "%X", v);

          p += 2;

          OPENSSL_strlcat(oline, htmp, sizeof(oline));

          if (i != 7) {

            OPENSSL_strlcat(oline, ":", sizeof(oline));

          }

        }

      } else {

        if (!X509V3_add_value("IP Address", "<invalid>", &ret)) {

          return NULL;

        }

        break;

      }

      if (!X509V3_add_value("IP Address", oline, &ret)) {

        return NULL;

      }

      break;

    case GEN_RID:

      i2t_ASN1_OBJECT(oline, 256, gen->d.rid);

      if (!X509V3_add_value("Registered ID", oline, &ret)) {

        return NULL;

      }

      break;

  }

  return ret;

}

int GENERAL_NAME_print(BIO *out, const GENERAL_NAME *gen) {

  switch (gen->type) {

    case GEN_OTHERNAME:

      BIO_printf(out, "othername:<unsupported>");

      break;

    case GEN_X400:

      BIO_printf(out, "X400Name:<unsupported>");

      break;

    case GEN_EDIPARTY:

      // Maybe fix this: it is supported now

      BIO_printf(out, "EdiPartyName:<unsupported>");

      break;

    case GEN_EMAIL:

      BIO_printf(out, "email:");

      ASN1_STRING_print(out, gen->d.ia5);

      break;

    case GEN_DNS:

      BIO_printf(out, "DNS:");

      ASN1_STRING_print(out, gen->d.ia5);

      break;

    case GEN_URI:

      BIO_printf(out, "URI:");

      ASN1_STRING_print(out, gen->d.ia5);

      break;

    case GEN_DIRNAME:

      BIO_printf(out, "DirName: ");

      X509_NAME_print_ex(out, gen->d.dirn, 0, XN_FLAG_ONELINE);

      break;

    case GEN_IPADD: {

      const unsigned char *p = gen->d.ip->data;

      if (gen->d.ip->length == 4) {

        BIO_printf(out, "IP Address:%d.%d.%d.%d", p[0], p[1], p[2], p[3]);

      } else if (gen->d.ip->length == 16) {

        BIO_printf(out, "IP Address");

        for (int i = 0; i < 8; i++) {

          uint16_t v = ((uint16_t)p[0] << 8) | p[1];

          BIO_printf(out, ":%X", v);

          p += 2;

        }

        BIO_puts(out, "\n");

      } else {

        BIO_printf(out, "IP Address:<invalid>");

        break;

      }

      break;

    }

    case GEN_RID:

      BIO_printf(out, "Registered ID");

      i2a_ASN1_OBJECT(out, gen->d.rid);

      break;

  }

  return 1;

}

static void *v2i_issuer_alt(const X509V3_EXT_METHOD *method,

                            const X509V3_CTX *ctx,

                            const STACK_OF(CONF_VALUE) *nval) {

  GENERAL_NAMES *gens = sk_GENERAL_NAME_new_null();

  if (gens == NULL) {

    return NULL;

  }

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

    const CONF_VALUE *cnf = sk_CONF_VALUE_value(nval, i);

    if (x509v3_conf_name_matches(cnf->name, "issuer") && cnf->value &&

        !strcmp(cnf->value, "copy")) {

      if (!copy_issuer(ctx, gens)) {

        goto err;

      }

    } else {

      GENERAL_NAME *gen = v2i_GENERAL_NAME(method, ctx, cnf);

      if (gen == NULL || !sk_GENERAL_NAME_push(gens, gen)) {

        GENERAL_NAME_free(gen);

        goto err;

      }

    }

  }

  return gens;

err:

  sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

  return NULL;

}

// Append subject altname of issuer to issuer alt name of subject

static int copy_issuer(const X509V3_CTX *ctx, GENERAL_NAMES *gens) {

  if (ctx && (ctx->flags == X509V3_CTX_TEST)) {

    return 1;

  }

  if (!ctx || !ctx->issuer_cert) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_ISSUER_DETAILS);

    return 0;

  }

  int i = X509_get_ext_by_NID(ctx->issuer_cert, NID_subject_alt_name, -1);

  if (i < 0) {

    return 1;

  }

  int ret = 0;

  GENERAL_NAMES *ialt = NULL;

  X509_EXTENSION *ext;

  if (!(ext = X509_get_ext(ctx->issuer_cert, i)) ||

      !(ialt = X509V3_EXT_d2i(ext))) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_ISSUER_DECODE_ERROR);

    goto err;

  }

  for (size_t j = 0; j < sk_GENERAL_NAME_num(ialt); j++) {

    GENERAL_NAME *gen = sk_GENERAL_NAME_value(ialt, j);

    if (!sk_GENERAL_NAME_push(gens, gen)) {

      goto err;

    }

    // Ownership of |gen| has moved from |ialt| to |gens|.

    sk_GENERAL_NAME_set(ialt, j, NULL);

  }

  ret = 1;

err:

  GENERAL_NAMES_free(ialt);

  return ret;

}

static void *v2i_subject_alt(const X509V3_EXT_METHOD *method,

                             const X509V3_CTX *ctx,

                             const STACK_OF(CONF_VALUE) *nval) {

  GENERAL_NAMES *gens = sk_GENERAL_NAME_new_null();

  if (gens == NULL) {

    return NULL;

  }

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

    const CONF_VALUE *cnf = sk_CONF_VALUE_value(nval, i);

    if (x509v3_conf_name_matches(cnf->name, "email") && cnf->value &&

        !strcmp(cnf->value, "copy")) {

      if (!copy_email(ctx, gens, 0)) {

        goto err;

      }

    } else if (x509v3_conf_name_matches(cnf->name, "email") && cnf->value &&

               !strcmp(cnf->value, "move")) {

      if (!copy_email(ctx, gens, 1)) {

        goto err;

      }

    } else {

      GENERAL_NAME *gen = v2i_GENERAL_NAME(method, ctx, cnf);

      if (gen == NULL || !sk_GENERAL_NAME_push(gens, gen)) {

        GENERAL_NAME_free(gen);

        goto err;

      }

    }

  }

  return gens;

err:

  sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

  return NULL;

}

// Copy any email addresses in a certificate or request to GENERAL_NAMES

static int copy_email(const X509V3_CTX *ctx, GENERAL_NAMES *gens, int move_p) {

  X509_NAME *nm;

  ASN1_IA5STRING *email = NULL;

  X509_NAME_ENTRY *ne;

  GENERAL_NAME *gen = NULL;

  int i;

  if (ctx != NULL && ctx->flags == X509V3_CTX_TEST) {

    return 1;

  }

  if (!ctx || (!ctx->subject_cert && !ctx->subject_req)) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_SUBJECT_DETAILS);

    goto err;

  }

  // Find the subject name

  if (ctx->subject_cert) {

    nm = X509_get_subject_name(ctx->subject_cert);

  } else {

    nm = X509_REQ_get_subject_name(ctx->subject_req);

  }

  // Now add any email address(es) to STACK

  i = -1;

  while ((i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i)) >= 0) {

    ne = X509_NAME_get_entry(nm, i);

    email = ASN1_STRING_dup(X509_NAME_ENTRY_get_data(ne));

    if (move_p) {

      X509_NAME_delete_entry(nm, i);

      X509_NAME_ENTRY_free(ne);

      i--;

    }

    if (!email || !(gen = GENERAL_NAME_new())) {

      goto err;

    }

    gen->d.ia5 = email;

    email = NULL;

    gen->type = GEN_EMAIL;

    if (!sk_GENERAL_NAME_push(gens, gen)) {

      goto err;

    }

    gen = NULL;

  }

  return 1;

err:

  GENERAL_NAME_free(gen);

  ASN1_IA5STRING_free(email);

  return 0;

}

GENERAL_NAMES *v2i_GENERAL_NAMES(const X509V3_EXT_METHOD *method,

                                 const X509V3_CTX *ctx,

                                 const STACK_OF(CONF_VALUE) *nval) {

  GENERAL_NAMES *gens = sk_GENERAL_NAME_new_null();

  if (gens == NULL) {

    return NULL;

  }

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

    const CONF_VALUE *cnf = sk_CONF_VALUE_value(nval, i);

    GENERAL_NAME *gen = v2i_GENERAL_NAME(method, ctx, cnf);

    if (gen == NULL || !sk_GENERAL_NAME_push(gens, gen)) {

      GENERAL_NAME_free(gen);

      goto err;

    }

  }

  return gens;

err:

  sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);

  return NULL;

}

GENERAL_NAME *v2i_GENERAL_NAME(const X509V3_EXT_METHOD *method,

                               const X509V3_CTX *ctx, const CONF_VALUE *cnf) {

  return v2i_GENERAL_NAME_ex(NULL, method, ctx, cnf, 0);

}

GENERAL_NAME *a2i_GENERAL_NAME(GENERAL_NAME *out,

                               const X509V3_EXT_METHOD *method,

                               const X509V3_CTX *ctx, int gen_type,

                               const char *value, int is_nc) {

  if (!value) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_MISSING_VALUE);

    return NULL;

  }

  GENERAL_NAME *gen = NULL;

  if (out) {

    gen = out;

  } else {

    gen = GENERAL_NAME_new();

    if (gen == NULL) {

      return NULL;

    }

  }

  switch (gen_type) {

    case GEN_URI:

    case GEN_EMAIL:

    case GEN_DNS: {

      ASN1_IA5STRING *str = ASN1_IA5STRING_new();

      if (str == NULL || !ASN1_STRING_set(str, value, strlen(value))) {

        ASN1_STRING_free(str);

        goto err;

      }

      gen->type = gen_type;

      gen->d.ia5 = str;

      break;

    }

    case GEN_RID: {

      ASN1_OBJECT *obj;

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

        OPENSSL_PUT_ERROR(X509V3, X509V3_R_BAD_OBJECT);

        ERR_add_error_data(2, "value=", value);

        goto err;

      }

      gen->type = GEN_RID;

      gen->d.rid = obj;

      break;

    }

    case GEN_IPADD:

      gen->type = GEN_IPADD;

      if (is_nc) {

        gen->d.ip = a2i_IPADDRESS_NC(value);

      } else {

        gen->d.ip = a2i_IPADDRESS(value);

      }

      if (gen->d.ip == NULL) {

        OPENSSL_PUT_ERROR(X509V3, X509V3_R_BAD_IP_ADDRESS);

        ERR_add_error_data(2, "value=", value);

        goto err;

      }

      break;

    case GEN_DIRNAME:

      if (!do_dirname(gen, value, ctx)) {

        OPENSSL_PUT_ERROR(X509V3, X509V3_R_DIRNAME_ERROR);

        goto err;

      }

      break;

    case GEN_OTHERNAME:

      if (!do_othername(gen, value, ctx)) {

        OPENSSL_PUT_ERROR(X509V3, X509V3_R_OTHERNAME_ERROR);

        goto err;

      }

      break;

    default:

      OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNSUPPORTED_TYPE);

      goto err;

  }

  return gen;

err:

  if (!out) {

    GENERAL_NAME_free(gen);

  }

  return NULL;

}

GENERAL_NAME *v2i_GENERAL_NAME_ex(GENERAL_NAME *out,

                                  const X509V3_EXT_METHOD *method,

                                  const X509V3_CTX *ctx, const CONF_VALUE *cnf,

                                  int is_nc) {

  const char *name = cnf->name;

  const char *value = cnf->value;

  if (!value) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_MISSING_VALUE);

    return NULL;

  }

  int type;

  if (x509v3_conf_name_matches(name, "email")) {

    type = GEN_EMAIL;

  } else if (x509v3_conf_name_matches(name, "URI")) {

    type = GEN_URI;

  } else if (x509v3_conf_name_matches(name, "DNS")) {

    type = GEN_DNS;

  } else if (x509v3_conf_name_matches(name, "RID")) {

    type = GEN_RID;

  } else if (x509v3_conf_name_matches(name, "IP")) {

    type = GEN_IPADD;

  } else if (x509v3_conf_name_matches(name, "dirName")) {

    type = GEN_DIRNAME;

  } else if (x509v3_conf_name_matches(name, "otherName")) {

    type = GEN_OTHERNAME;

  } else {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNSUPPORTED_OPTION);

    ERR_add_error_data(2, "name=", name);

    return NULL;

  }

  return a2i_GENERAL_NAME(out, method, ctx, type, value, is_nc);

}

static int do_othername(GENERAL_NAME *gen, const char *value,

                        const X509V3_CTX *ctx) {

  const char *semicolon = strchr(value, ';');

  if (semicolon == NULL) {

    return 0;

  }

  OTHERNAME *name = OTHERNAME_new();

  if (name == NULL) {

    return 0;

  }

  char *objtmp = OPENSSL_strndup(value, semicolon - value);

  if (objtmp == NULL) {

    goto err;

  }

  ASN1_OBJECT_free(name->type_id);

  name->type_id = OBJ_txt2obj(objtmp, /*dont_search_names=*/0);

  OPENSSL_free(objtmp);

  if (name->type_id == NULL) {

    goto err;

  }

  ASN1_TYPE_free(name->value);

  name->value = ASN1_generate_v3(semicolon + 1, ctx);

  if (name->value == NULL) {

    goto err;

  }

  gen->type = GEN_OTHERNAME;

  gen->d.otherName = name;

  return 1;

err:

  OTHERNAME_free(name);

  return 0;

}

static int do_dirname(GENERAL_NAME *gen, const char *value,

                      const X509V3_CTX *ctx) {

  int ret = 0;

  X509_NAME *nm = X509_NAME_new();

  if (nm == NULL) {

    goto err;

  }

  const STACK_OF(CONF_VALUE) *sk = X509V3_get_section(ctx, value);

  if (sk == NULL) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_SECTION_NOT_FOUND);

    ERR_add_error_data(2, "section=", value);

    goto err;

  }

  // FIXME: should allow other character types...

  if (!X509V3_NAME_from_section(nm, sk, MBSTRING_ASC)) {

    goto err;

  }

  gen->type = GEN_DIRNAME;

  gen->d.dirn = nm;

  ret = 1;

err:

  if (!ret) {

    X509_NAME_free(nm);

  }

  return ret;

}