crypto/x509/v3_alt.c - boringssl - Git at Google

 /*
  * 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/x509.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) {
         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];
           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);
 }

 static 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;
 }
	/*
	* 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/x509.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) {
	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];
	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);
	}

	static 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;
	}