text: /* 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 <openssl_grpc/asn1.h>
  #include <openssl_grpc/asn1t.h>
  #include <openssl_grpc/digest.h>
  #include <openssl_grpc/err.h>
  #include <openssl_grpc/mem.h>
  #include <openssl_grpc/obj.h>
  #include <openssl_grpc/stack.h>
  #include <openssl_grpc/thread.h>
  #include <openssl_grpc/x509.h>
  #include <openssl_grpc/x509v3.h>
  
  #include "../internal.h"
  
  /*
   * Method to handle CRL access. In general a CRL could be very large (several
   * Mb) and can consume large amounts of resources if stored in memory by
   * multiple processes. This method allows general CRL operations to be
   * redirected to more efficient callbacks: for example a CRL entry database.
   */
  
  #define X509_CRL_METHOD_DYNAMIC         1
  
  struct x509_crl_method_st {
      int flags;
      int (*crl_init) (X509_CRL *crl);
      int (*crl_free) (X509_CRL *crl);
      int (*crl_lookup) (X509_CRL *crl, X509_REVOKED **ret,
                         ASN1_INTEGER *ser, X509_NAME *issuer);
      int (*crl_verify) (X509_CRL *crl, EVP_PKEY *pk);
  };
  
  static int X509_REVOKED_cmp(const X509_REVOKED **a, const X509_REVOKED **b);
  static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
  
  ASN1_SEQUENCE(X509_REVOKED) = {
          ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
          ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
          ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
  } ASN1_SEQUENCE_END(X509_REVOKED)
  
  static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
  static int def_crl_lookup(X509_CRL *crl,
                            X509_REVOKED **ret, ASN1_INTEGER *serial,
                            X509_NAME *issuer);
  
  static const X509_CRL_METHOD int_crl_meth = {
      0,
      0, 0,
      def_crl_lookup,
      def_crl_verify
  };
  
  static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
  
  /*
   * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
   * the original encoding the signature wont be affected by reordering of the
   * revoked field.
   */
  static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                        void *exarg)
  {
      X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
  
      if (!a || !a->revoked)
          return 1;
      switch (operation) {
          /*
           * Just set cmp function here. We don't sort because that would
           * affect the output of X509_CRL_print().
           */
      case ASN1_OP_D2I_POST:
          /* TODO(davidben): Check that default |versions| are never encoded and
           * that |extensions| is only present in v2. */
  
          (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
          break;
      }
      return 1;
  }
  
  
  ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
          ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
          ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
          ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
          ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
          ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
          ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
          ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
  } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
  
  /*
   * Set CRL entry issuer according to CRL certificate issuer extension. Check
   * for unhandled critical CRL entry extensions.
   */
  
  static int crl_set_issuers(X509_CRL *crl)
  {
  
      size_t i, k;
      int j;
      GENERAL_NAMES *gens, *gtmp;
      STACK_OF(X509_REVOKED) *revoked;
  
      revoked = X509_CRL_get_REVOKED(crl);
  
      gens = NULL;
      for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
          X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
          STACK_OF(X509_EXTENSION) *exts;
          ASN1_ENUMERATED *reason;
          X509_EXTENSION *ext;
          gtmp = X509_REVOKED_get_ext_d2i(rev,
                                          NID_certificate_issuer, &j, NULL);
          if (!gtmp && (j != -1)) {
              crl->flags |= EXFLAG_INVALID;
              return 1;
          }
  
          if (gtmp) {
              gens = gtmp;
              if (!crl->issuers) {
                  crl->issuers = sk_GENERAL_NAMES_new_null();
                  if (!crl->issuers)
                      return 0;
              }
              if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
                  return 0;
          }
          rev->issuer = gens;
  
          reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
          if (!reason && (j != -1)) {
              crl->flags |= EXFLAG_INVALID;
              return 1;
          }
  
          if (reason) {
              rev->reason = ASN1_ENUMERATED_get(reason);
              ASN1_ENUMERATED_free(reason);
          } else
              rev->reason = CRL_REASON_NONE;
  
          /* Check for critical CRL entry extensions */
  
          exts = rev->extensions;
  
          for (k = 0; k < sk_X509_EXTENSION_num(exts); k++) {
              ext = sk_X509_EXTENSION_value(exts, k);
              if (ext->critical > 0) {
                  if (OBJ_obj2nid(ext->object) == NID_certificate_issuer)
                      continue;
                  crl->flags |= EXFLAG_CRITICAL;
                  break;
              }
          }
  
      }
  
      return 1;
  
  }
  
  /*
   * The X509_CRL structure needs a bit of customisation. Cache some extensions
   * and hash of the whole CRL.
   */
  static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
                    void *exarg)
  {
      X509_CRL *crl = (X509_CRL *)*pval;
      STACK_OF(X509_EXTENSION) *exts;
      X509_EXTENSION *ext;
      size_t idx;
      int i;
  
      switch (operation) {
      case ASN1_OP_NEW_POST:
          crl->idp = NULL;
          crl->akid = NULL;
          crl->flags = 0;
          crl->idp_flags = 0;
          crl->idp_reasons = CRLDP_ALL_REASONS;
          crl->meth = default_crl_method;
          crl->meth_data = NULL;
          crl->issuers = NULL;
          crl->crl_number = NULL;
          crl->base_crl_number = NULL;
          break;
  
      case ASN1_OP_D2I_POST:
          if (!X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL)) {
              return 0;
          }
  
          crl->idp = X509_CRL_get_ext_d2i(crl,
                                          NID_issuing_distribution_point, &i,
                                          NULL);
          if (crl->idp != NULL) {
              if (!setup_idp(crl, crl->idp)) {
                  return 0;
              }
          } else if (i != -1) {
              return 0;
          }
  
          crl->akid = X509_CRL_get_ext_d2i(crl,
                                           NID_authority_key_identifier, &i,
                                           NULL);
          if (crl->akid == NULL && i != -1) {
              return 0;
          }
  
          crl->crl_number = X509_CRL_get_ext_d2i(crl,
                                                 NID_crl_number, &i, NULL);
          if (crl->crl_number == NULL && i != -1) {
              return 0;
          }
  
          crl->base_crl_number = X509_CRL_get_ext_d2i(crl, NID_delta_crl, &i,
                                                      NULL);
          if (crl->base_crl_number == NULL && i != -1) {
              return 0;
          }
          /* Delta CRLs must have CRL number */
          if (crl->base_crl_number && !crl->crl_number) {
              OPENSSL_PUT_ERROR(X509, X509_R_DELTA_CRL_WITHOUT_CRL_NUMBER);
              return 0;
          }
  
          /*
           * See if we have any unhandled critical CRL extensions and indicate
           * this in a flag. We only currently handle IDP so anything else
           * critical sets the flag. This code accesses the X509_CRL structure
           * directly: applications shouldn't do this.
           */
  
          exts = crl->crl->extensions;
  
          for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
              int nid;
              ext = sk_X509_EXTENSION_value(exts, idx);
              nid = OBJ_obj2nid(ext->object);
              if (nid == NID_freshest_crl)
                  crl->flags |= EXFLAG_FRESHEST;
              if (ext->critical > 0) {
                  /* We handle IDP and deltas */
                  if ((nid == NID_issuing_distribution_point)
                      || (nid == NID_authority_key_identifier)
                      || (nid == NID_delta_crl))
                      continue;
                  crl->flags |= EXFLAG_CRITICAL;
                  break;
              }
          }
  
          if (!crl_set_issuers(crl))
              return 0;
  
          if (crl->meth->crl_init) {
              if (crl->meth->crl_init(crl) == 0)
                  return 0;
          }
          break;
  
      case ASN1_OP_FREE_POST:
          /* |crl->meth| may be NULL if constructing the object failed before
           * |ASN1_OP_NEW_POST| was run. */
          if (crl->meth && crl->meth->crl_free) {
              if (!crl->meth->crl_free(crl))
                  return 0;
          }
          if (crl->akid)
              AUTHORITY_KEYID_free(crl->akid);
          if (crl->idp)
              ISSUING_DIST_POINT_free(crl->idp);
          ASN1_INTEGER_free(crl->crl_number);
          ASN1_INTEGER_free(crl->base_crl_number);
          sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
          break;
      }
      return 1;
  }
  
  /* Convert IDP into a more convenient form */
  
  static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
  {
      int idp_only = 0;
      /* Set various flags according to IDP */
      crl->idp_flags |= IDP_PRESENT;
      if (idp->onlyuser > 0) {
          idp_only++;
          crl->idp_flags |= IDP_ONLYUSER;
      }
      if (idp->onlyCA > 0) {
          idp_only++;
          crl->idp_flags |= IDP_ONLYCA;
      }
      if (idp->onlyattr > 0) {
          idp_only++;
          crl->idp_flags |= IDP_ONLYATTR;
      }
  
      if (idp_only > 1)
          crl->idp_flags |= IDP_INVALID;
  
      if (idp->indirectCRL > 0)
          crl->idp_flags |= IDP_INDIRECT;
  
      if (idp->onlysomereasons) {
          crl->idp_flags |= IDP_REASONS;
          if (idp->onlysomereasons->length > 0)
              crl->idp_reasons = idp->onlysomereasons->data[0];
          if (idp->onlysomereasons->length > 1)
              crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
          crl->idp_reasons &= CRLDP_ALL_REASONS;
      }
  
      return DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
  }
  
  ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
          ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
          ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
          ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
  } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
  
  IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
  
  IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
  
  IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
  IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
  IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
  
  static int X509_REVOKED_cmp(const X509_REVOKED **a, const X509_REVOKED **b)
  {
      return (ASN1_STRING_cmp((ASN1_STRING *)(*a)->serialNumber,
                              (ASN1_STRING *)(*b)->serialNumber));
  }
  
  int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
  {
      X509_CRL_INFO *inf;
      inf = crl->crl;
      if (!inf->revoked)
          inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
      if (!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
          OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
          return 0;
      }
      inf->enc.modified = 1;
      return 1;
  }
  
  int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *pkey)
  {
      if (crl->meth->crl_verify)
          return crl->meth->crl_verify(crl, pkey);
      return 0;
  }
  
  int X509_CRL_get0_by_serial(X509_CRL *crl,
                              X509_REVOKED **ret, ASN1_INTEGER *serial)
  {
      if (crl->meth->crl_lookup)
          return crl->meth->crl_lookup(crl, ret, serial, NULL);
      return 0;
  }
  
  int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
  {
      if (crl->meth->crl_lookup)
          return crl->meth->crl_lookup(crl, ret,
                                       X509_get_serialNumber(x),
                                       X509_get_issuer_name(x));
      return 0;
  }
  
  static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
  {
      return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
                               crl->sig_alg, crl->signature, crl->crl, r));
  }
  
  static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
                                      X509_REVOKED *rev)
  {
      size_t i;
  
      if (!rev->issuer) {
          if (!nm)
              return 1;
          if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
              return 1;
          return 0;
      }
  
      if (!nm)
          nm = X509_CRL_get_issuer(crl);
  
      for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
          GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
          if (gen->type != GEN_DIRNAME)
              continue;
          if (!X509_NAME_cmp(nm, gen->d.directoryName))
              return 1;
      }
      return 0;
  
  }
  
  static struct CRYPTO_STATIC_MUTEX g_crl_sort_lock = CRYPTO_STATIC_MUTEX_INIT;
  
  static int def_crl_lookup(X509_CRL *crl,
                            X509_REVOKED **ret, ASN1_INTEGER *serial,
                            X509_NAME *issuer)
  {
      X509_REVOKED rtmp, *rev;
      size_t idx;
      rtmp.serialNumber = serial;
      /*
       * Sort revoked into serial number order if not already sorted. Do this
       * under a lock to avoid race condition.
       */
  
      CRYPTO_STATIC_MUTEX_lock_read(&g_crl_sort_lock);
      const int is_sorted = sk_X509_REVOKED_is_sorted(crl->crl->revoked);
      CRYPTO_STATIC_MUTEX_unlock_read(&g_crl_sort_lock);
  
      if (!is_sorted) {
          CRYPTO_STATIC_MUTEX_lock_write(&g_crl_sort_lock);
          if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) {
              sk_X509_REVOKED_sort(crl->crl->revoked);
          }
          CRYPTO_STATIC_MUTEX_unlock_write(&g_crl_sort_lock);
      }
  
      if (!sk_X509_REVOKED_find(crl->crl->revoked, &idx, &rtmp))
          return 0;
      /* Need to look for matching name */
      for (; idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) {
          rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
          if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
              return 0;
          if (crl_revoked_issuer_match(crl, issuer, rev)) {
              if (ret)
                  *ret = rev;
              if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
                  return 2;
              return 1;
          }
      }
      return 0;
  }
  
  void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
  {
      if (meth == NULL)
          default_crl_method = &int_crl_meth;
      else
          default_crl_method = meth;
  }
  
  X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
                                       int (*crl_free) (X509_CRL *crl),
                                       int (*crl_lookup) (X509_CRL *crl,
                                                          X509_REVOKED **ret,
                                                          ASN1_INTEGER *ser,
                                                          X509_NAME *issuer),
                                       int (*crl_verify) (X509_CRL *crl,
                                                          EVP_PKEY *pk))
  {
      X509_CRL_METHOD *m;
      m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
      if (!m)
          return NULL;
      m->crl_init = crl_init;
      m->crl_free = crl_free;
      m->crl_lookup = crl_lookup;
      m->crl_verify = crl_verify;
      m->flags = X509_CRL_METHOD_DYNAMIC;
      return m;
  }
  
  void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
  {
      if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
          return;
      OPENSSL_free(m);
  }
  
  void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
  {
      crl->meth_data = dat;
  }
  
  void *X509_CRL_get_meth_data(X509_CRL *crl)
  {
      return crl->meth_data;
  }
  
  IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
  
  IMPLEMENT_ASN1_SET_OF(X509_CRL)
  