text: /* apps/s_cb.c - callback functions used by s_client, s_server, and s_time */
  /* 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.]
   */
  /* ====================================================================
   * Copyright (c) 1998-2006 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
   *    openssl-core@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 <stdlib.h>
  #include <string.h> /* for memcpy() and strcmp() */
  #define USE_SOCKETS
  #define NON_MAIN
  #include "apps.h"
  #undef NON_MAIN
  #undef USE_SOCKETS
  #include <openssl/err.h>
  #include <openssl/rand.h>
  #include <openssl/x509.h>
  #include <openssl/ssl.h>
  #include "s_apps.h"
  
  #define COOKIE_SECRET_LENGTH    16
  
  int verify_depth = 0;
  int verify_quiet = 0;
  int verify_error = X509_V_OK;
  int verify_return_error = 0;
  unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
  int cookie_initialized = 0;
  
  int MS_CALLBACK verify_callback(int ok, X509_STORE_CTX *ctx)
  {
      X509 *err_cert;
      int err, depth;
  
      err_cert = X509_STORE_CTX_get_current_cert(ctx);
      err = X509_STORE_CTX_get_error(ctx);
      depth = X509_STORE_CTX_get_error_depth(ctx);
  
      if (!verify_quiet || !ok) {
          BIO_printf(bio_err, "depth=%d ", depth);
          if (err_cert) {
              X509_NAME_print_ex(bio_err,
                                 X509_get_subject_name(err_cert),
                                 0, XN_FLAG_ONELINE);
              BIO_puts(bio_err, "\n");
          } else
              BIO_puts(bio_err, "<no cert>\n");
      }
      if (!ok) {
          BIO_printf(bio_err, "verify error:num=%d:%s\n", err,
                     X509_verify_cert_error_string(err));
          if (verify_depth >= depth) {
              if (!verify_return_error)
                  ok = 1;
              verify_error = X509_V_OK;
          } else {
              ok = 0;
              verify_error = X509_V_ERR_CERT_CHAIN_TOO_LONG;
          }
      }
      switch (err) {
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
          BIO_puts(bio_err, "issuer= ");
          X509_NAME_print_ex(bio_err, X509_get_issuer_name(err_cert),
                             0, XN_FLAG_ONELINE);
          BIO_puts(bio_err, "\n");
          break;
      case X509_V_ERR_CERT_NOT_YET_VALID:
      case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
          BIO_printf(bio_err, "notBefore=");
          ASN1_TIME_print(bio_err, X509_get_notBefore(err_cert));
          BIO_printf(bio_err, "\n");
          break;
      case X509_V_ERR_CERT_HAS_EXPIRED:
      case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
          BIO_printf(bio_err, "notAfter=");
          ASN1_TIME_print(bio_err, X509_get_notAfter(err_cert));
          BIO_printf(bio_err, "\n");
          break;
      case X509_V_ERR_NO_EXPLICIT_POLICY:
          if (!verify_quiet)
              policies_print(bio_err, ctx);
          break;
      }
      if (err == X509_V_OK && ok == 2 && !verify_quiet)
          policies_print(bio_err, ctx);
      if (ok && !verify_quiet)
          BIO_printf(bio_err, "verify return:%d\n", ok);
      return (ok);
  }
  
  int set_cert_stuff(SSL_CTX *ctx, char *cert_file, char *key_file)
  {
      if (cert_file != NULL) {
          /*-
          SSL *ssl;
          X509 *x509;
          */
  
          if (SSL_CTX_use_certificate_file(ctx, cert_file,
                                           SSL_FILETYPE_PEM) <= 0) {
              BIO_printf(bio_err, "unable to get certificate from '%s'\n",
                         cert_file);
              ERR_print_errors(bio_err);
              return (0);
          }
          if (key_file == NULL)
              key_file = cert_file;
          if (SSL_CTX_use_PrivateKey_file(ctx, key_file, SSL_FILETYPE_PEM) <= 0) {
              BIO_printf(bio_err, "unable to get private key from '%s'\n",
                         key_file);
              ERR_print_errors(bio_err);
              return (0);
          }
  
          /*-
          In theory this is no longer needed
          ssl=SSL_new(ctx);
          x509=SSL_get_certificate(ssl);
  
          if (x509 != NULL) {
                  EVP_PKEY *pktmp;
                  pktmp = X509_get_pubkey(x509);
                  EVP_PKEY_copy_parameters(pktmp,
                                          SSL_get_privatekey(ssl));
                  EVP_PKEY_free(pktmp);
          }
          SSL_free(ssl);
          */
  
          /*
           * If we are using DSA, we can copy the parameters from the private
           * key
           */
  
          /*
           * Now we know that a key and cert have been set against the SSL
           * context
           */
          if (!SSL_CTX_check_private_key(ctx)) {
              BIO_printf(bio_err,
                         "Private key does not match the certificate public key\n");
              return (0);
          }
      }
      return (1);
  }
  
  int set_cert_key_stuff(SSL_CTX *ctx, X509 *cert, EVP_PKEY *key,
                         STACK_OF(X509) *chain, int build_chain)
  {
      int chflags = chain ? SSL_BUILD_CHAIN_FLAG_CHECK : 0;
      if (cert == NULL)
          return 1;
      if (SSL_CTX_use_certificate(ctx, cert) <= 0) {
          BIO_printf(bio_err, "error setting certificate\n");
          ERR_print_errors(bio_err);
          return 0;
      }
  
      if (SSL_CTX_use_PrivateKey(ctx, key) <= 0) {
          BIO_printf(bio_err, "error setting private key\n");
          ERR_print_errors(bio_err);
          return 0;
      }
  
      /*
       * Now we know that a key and cert have been set against the SSL context
       */
      if (!SSL_CTX_check_private_key(ctx)) {
          BIO_printf(bio_err,
                     "Private key does not match the certificate public key\n");
          return 0;
      }
      if (chain && !SSL_CTX_set1_chain(ctx, chain)) {
          BIO_printf(bio_err, "error setting certificate chain\n");
          ERR_print_errors(bio_err);
          return 0;
      }
      if (build_chain && !SSL_CTX_build_cert_chain(ctx, chflags)) {
          BIO_printf(bio_err, "error building certificate chain\n");
          ERR_print_errors(bio_err);
          return 0;
      }
      return 1;
  }
  
  static void ssl_print_client_cert_types(BIO *bio, SSL *s)
  {
      const unsigned char *p;
      int i;
      int cert_type_num = SSL_get0_certificate_types(s, &p);
      if (!cert_type_num)
          return;
      BIO_puts(bio, "Client Certificate Types: ");
      for (i = 0; i < cert_type_num; i++) {
          unsigned char cert_type = p[i];
          char *cname;
          switch (cert_type) {
          case TLS_CT_RSA_SIGN:
              cname = "RSA sign";
              break;
  
          case TLS_CT_DSS_SIGN:
              cname = "DSA sign";
              break;
  
          case TLS_CT_RSA_FIXED_DH:
              cname = "RSA fixed DH";
              break;
  
          case TLS_CT_DSS_FIXED_DH:
              cname = "DSS fixed DH";
              break;
  
          case TLS_CT_ECDSA_SIGN:
              cname = "ECDSA sign";
              break;
  
          case TLS_CT_RSA_FIXED_ECDH:
              cname = "RSA fixed ECDH";
              break;
  
          case TLS_CT_ECDSA_FIXED_ECDH:
              cname = "ECDSA fixed ECDH";
              break;
  
          case TLS_CT_GOST94_SIGN:
              cname = "GOST94 Sign";
              break;
  
          case TLS_CT_GOST01_SIGN:
              cname = "GOST01 Sign";
              break;
  
          default:
              cname = NULL;
          }
  
          if (i)
              BIO_puts(bio, ", ");
  
          if (cname)
              BIO_puts(bio, cname);
          else
              BIO_printf(bio, "UNKNOWN (%d),", cert_type);
      }
      BIO_puts(bio, "\n");
  }
  
  static int do_print_sigalgs(BIO *out, SSL *s, int shared)
  {
      int i, nsig, client;
      client = SSL_is_server(s) ? 0 : 1;
      if (shared)
          nsig = SSL_get_shared_sigalgs(s, -1, NULL, NULL, NULL, NULL, NULL);
      else
          nsig = SSL_get_sigalgs(s, -1, NULL, NULL, NULL, NULL, NULL);
      if (nsig == 0)
          return 1;
  
      if (shared)
          BIO_puts(out, "Shared ");
  
      if (client)
          BIO_puts(out, "Requested ");
      BIO_puts(out, "Signature Algorithms: ");
      for (i = 0; i < nsig; i++) {
          int hash_nid, sign_nid;
          unsigned char rhash, rsign;
          const char *sstr = NULL;
          if (shared)
              SSL_get_shared_sigalgs(s, i, &sign_nid, &hash_nid, NULL,
                                     &rsign, &rhash);
          else
              SSL_get_sigalgs(s, i, &sign_nid, &hash_nid, NULL, &rsign, &rhash);
          if (i)
              BIO_puts(out, ":");
          if (sign_nid == EVP_PKEY_RSA)
              sstr = "RSA";
          else if (sign_nid == EVP_PKEY_DSA)
              sstr = "DSA";
          else if (sign_nid == EVP_PKEY_EC)
              sstr = "ECDSA";
          if (sstr)
              BIO_printf(out, "%s+", sstr);
          else
              BIO_printf(out, "0x%02X+", (int)rsign);
          if (hash_nid != NID_undef)
              BIO_printf(out, "%s", OBJ_nid2sn(hash_nid));
          else
              BIO_printf(out, "0x%02X", (int)rhash);
      }
      BIO_puts(out, "\n");
      return 1;
  }
  
  int ssl_print_sigalgs(BIO *out, SSL *s)
  {
      int mdnid;
      if (!SSL_is_server(s))
          ssl_print_client_cert_types(out, s);
      do_print_sigalgs(out, s, 0);
      do_print_sigalgs(out, s, 1);
      if (SSL_get_peer_signature_nid(s, &mdnid))
          BIO_printf(out, "Peer signing digest: %s\n", OBJ_nid2sn(mdnid));
      return 1;
  }
  
  #ifndef OPENSSL_NO_EC
  int ssl_print_point_formats(BIO *out, SSL *s)
  {
      int i, nformats;
      const char *pformats;
      nformats = SSL_get0_ec_point_formats(s, &pformats);
      if (nformats <= 0)
          return 1;
      BIO_puts(out, "Supported Elliptic Curve Point Formats: ");
      for (i = 0; i < nformats; i++, pformats++) {
          if (i)
              BIO_puts(out, ":");
          switch (*pformats) {
          case TLSEXT_ECPOINTFORMAT_uncompressed:
              BIO_puts(out, "uncompressed");
              break;
  
          case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime:
              BIO_puts(out, "ansiX962_compressed_prime");
              break;
  
          case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2:
              BIO_puts(out, "ansiX962_compressed_char2");
              break;
  
          default:
              BIO_printf(out, "unknown(%d)", (int)*pformats);
              break;
  
          }
      }
      if (nformats <= 0)
          BIO_puts(out, "NONE");
      BIO_puts(out, "\n");
      return 1;
  }
  
  int ssl_print_curves(BIO *out, SSL *s, int noshared)
  {
      int i, ncurves, *curves, nid;
      const char *cname;
      ncurves = SSL_get1_curves(s, NULL);
      if (ncurves <= 0)
          return 1;
      curves = OPENSSL_malloc(ncurves * sizeof(int));
      if (!curves) {
          BIO_puts(out, "Malloc error getting supported curves\n");
          return 0;
      }
      SSL_get1_curves(s, curves);
  
  
      BIO_puts(out, "Supported Elliptic Curves: ");
      for (i = 0; i < ncurves; i++) {
          if (i)
              BIO_puts(out, ":");
          nid = curves[i];
          /* If unrecognised print out hex version */
          if (nid & TLSEXT_nid_unknown)
              BIO_printf(out, "0x%04X", nid & 0xFFFF);
          else {
              /* Use NIST name for curve if it exists */
              cname = EC_curve_nid2nist(nid);
              if (!cname)
                  cname = OBJ_nid2sn(nid);
              BIO_printf(out, "%s", cname);
          }
      }
      if (ncurves == 0)
          BIO_puts(out, "NONE");
      OPENSSL_free(curves);
      if (noshared) {
          BIO_puts(out, "\n");
          return 1;
      }
      BIO_puts(out, "\nShared Elliptic curves: ");
      ncurves = SSL_get_shared_curve(s, -1);
      for (i = 0; i < ncurves; i++) {
          if (i)
              BIO_puts(out, ":");
          nid = SSL_get_shared_curve(s, i);
          cname = EC_curve_nid2nist(nid);
          if (!cname)
              cname = OBJ_nid2sn(nid);
          BIO_printf(out, "%s", cname);
      }
      if (ncurves == 0)
          BIO_puts(out, "NONE");
      BIO_puts(out, "\n");
      return 1;
  }
  #endif
  int ssl_print_tmp_key(BIO *out, SSL *s)
  {
      EVP_PKEY *key;
      if (!SSL_get_server_tmp_key(s, &key))
          return 1;
      BIO_puts(out, "Server Temp Key: ");
      switch (EVP_PKEY_id(key)) {
      case EVP_PKEY_RSA:
          BIO_printf(out, "RSA, %d bits\n", EVP_PKEY_bits(key));
          break;
  
      case EVP_PKEY_DH:
          BIO_printf(out, "DH, %d bits\n", EVP_PKEY_bits(key));
          break;
  #ifndef OPENSSL_NO_ECDH
      case EVP_PKEY_EC:
          {
              EC_KEY *ec = EVP_PKEY_get1_EC_KEY(key);
              int nid;
              const char *cname;
              nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
              EC_KEY_free(ec);
              cname = EC_curve_nid2nist(nid);
              if (!cname)
                  cname = OBJ_nid2sn(nid);
              BIO_printf(out, "ECDH, %s, %d bits\n", cname, EVP_PKEY_bits(key));
          }
  #endif
      }
      EVP_PKEY_free(key);
      return 1;
  }
  
  long MS_CALLBACK bio_dump_callback(BIO *bio, int cmd, const char *argp,
                                     int argi, long argl, long ret)
  {
      BIO *out;
  
      out = (BIO *)BIO_get_callback_arg(bio);
      if (out == NULL)
          return (ret);
  
      if (cmd == (BIO_CB_READ | BIO_CB_RETURN)) {
          BIO_printf(out, "read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
                     (void *)bio, argp, (unsigned long)argi, ret, ret);
          BIO_dump(out, argp, (int)ret);
          return (ret);
      } else if (cmd == (BIO_CB_WRITE | BIO_CB_RETURN)) {
          BIO_printf(out, "write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
                     (void *)bio, argp, (unsigned long)argi, ret, ret);
          BIO_dump(out, argp, (int)ret);
      }
      return (ret);
  }
  
  void MS_CALLBACK apps_ssl_info_callback(const SSL *s, int where, int ret)
  {
      const char *str;
      int w;
  
      w = where & ~SSL_ST_MASK;
  
      if (w & SSL_ST_CONNECT)
          str = "SSL_connect";
      else if (w & SSL_ST_ACCEPT)
          str = "SSL_accept";
      else
          str = "undefined";
  
      if (where & SSL_CB_LOOP) {
          BIO_printf(bio_err, "%s:%s\n", str, SSL_state_string_long(s));
      } else if (where & SSL_CB_ALERT) {
          str = (where & SSL_CB_READ) ? "read" : "write";
          BIO_printf(bio_err, "SSL3 alert %s:%s:%s\n",
                     str,
                     SSL_alert_type_string_long(ret),
                     SSL_alert_desc_string_long(ret));
      } else if (where & SSL_CB_EXIT) {
          if (ret == 0)
              BIO_printf(bio_err, "%s:failed in %s\n",
                         str, SSL_state_string_long(s));
          else if (ret < 0) {
              BIO_printf(bio_err, "%s:error in %s\n",
                         str, SSL_state_string_long(s));
          }
      }
  }
  
  void MS_CALLBACK msg_cb(int write_p, int version, int content_type,
                          const void *buf, size_t len, SSL *ssl, void *arg)
  {
      BIO *bio = arg;
      const char *str_write_p, *str_version, *str_content_type =
          "", *str_details1 = "", *str_details2 = "";
  
      str_write_p = write_p ? ">>>" : "<<<";
  
      switch (version) {
      case SSL2_VERSION:
          str_version = "SSL 2.0";
          break;
      case SSL3_VERSION:
          str_version = "SSL 3.0 ";
          break;
      case TLS1_VERSION:
          str_version = "TLS 1.0 ";
          break;
      case TLS1_1_VERSION:
          str_version = "TLS 1.1 ";
          break;
      case TLS1_2_VERSION:
          str_version = "TLS 1.2 ";
          break;
      case DTLS1_VERSION:
          str_version = "DTLS 1.0 ";
          break;
      case DTLS1_BAD_VER:
          str_version = "DTLS 1.0 (bad) ";
          break;
      default:
          str_version = "???";
      }
  
      if (version == SSL2_VERSION) {
          str_details1 = "???";
  
          if (len > 0) {
              switch (((const unsigned char *)buf)[0]) {
              case 0:
                  str_details1 = ", ERROR:";
                  str_details2 = " ???";
                  if (len >= 3) {
                      unsigned err =
                          (((const unsigned char *)buf)[1] << 8) +
                          ((const unsigned char *)buf)[2];
  
                      switch (err) {
                      case 0x0001:
                          str_details2 = " NO-CIPHER-ERROR";
                          break;
                      case 0x0002:
                          str_details2 = " NO-CERTIFICATE-ERROR";
                          break;
                      case 0x0004:
                          str_details2 = " BAD-CERTIFICATE-ERROR";
                          break;
                      case 0x0006:
                          str_details2 = " UNSUPPORTED-CERTIFICATE-TYPE-ERROR";
                          break;
                      }
                  }
  
                  break;
              case 1:
                  str_details1 = ", CLIENT-HELLO";
                  break;
              case 2:
                  str_details1 = ", CLIENT-MASTER-KEY";
                  break;
              case 3:
                  str_details1 = ", CLIENT-FINISHED";
                  break;
              case 4:
                  str_details1 = ", SERVER-HELLO";
                  break;
              case 5:
                  str_details1 = ", SERVER-VERIFY";
                  break;
              case 6:
                  str_details1 = ", SERVER-FINISHED";
                  break;
              case 7:
                  str_details1 = ", REQUEST-CERTIFICATE";
                  break;
              case 8:
                  str_details1 = ", CLIENT-CERTIFICATE";
                  break;
              }
          }
      }
  
      if (version == SSL3_VERSION ||
          version == TLS1_VERSION ||
          version == TLS1_1_VERSION ||
          version == TLS1_2_VERSION ||
          version == DTLS1_VERSION || version == DTLS1_BAD_VER) {
          switch (content_type) {
          case 20:
              str_content_type = "ChangeCipherSpec";
              break;
          case 21:
              str_content_type = "Alert";
              break;
          case 22:
              str_content_type = "Handshake";
              break;
          }
  
          if (content_type == 21) { /* Alert */
              str_details1 = ", ???";
  
              if (len == 2) {
                  switch (((const unsigned char *)buf)[0]) {
                  case 1:
                      str_details1 = ", warning";
                      break;
                  case 2:
                      str_details1 = ", fatal";
                      break;
                  }
  
                  str_details2 = " ???";
                  switch (((const unsigned char *)buf)[1]) {
                  case 0:
                      str_details2 = " close_notify";
                      break;
                  case 10:
                      str_details2 = " unexpected_message";
                      break;
                  case 20:
                      str_details2 = " bad_record_mac";
                      break;
                  case 21:
                      str_details2 = " decryption_failed";
                      break;
                  case 22:
                      str_details2 = " record_overflow";
                      break;
                  case 30:
                      str_details2 = " decompression_failure";
                      break;
                  case 40:
                      str_details2 = " handshake_failure";
                      break;
                  case 42:
                      str_details2 = " bad_certificate";
                      break;
                  case 43:
                      str_details2 = " unsupported_certificate";
                      break;
                  case 44:
                      str_details2 = " certificate_revoked";
                      break;
                  case 45:
                      str_details2 = " certificate_expired";
                      break;
                  case 46:
                      str_details2 = " certificate_unknown";
                      break;
                  case 47:
                      str_details2 = " illegal_parameter";
                      break;
                  case 48:
                      str_details2 = " unknown_ca";
                      break;
                  case 49:
                      str_details2 = " access_denied";
                      break;
                  case 50:
                      str_details2 = " decode_error";
                      break;
                  case 51:
                      str_details2 = " decrypt_error";
                      break;
                  case 60:
                      str_details2 = " export_restriction";
                      break;
                  case 70:
                      str_details2 = " protocol_version";
                      break;
                  case 71:
                      str_details2 = " insufficient_security";
                      break;
                  case 80:
                      str_details2 = " internal_error";
                      break;
                  case 90:
                      str_details2 = " user_canceled";
                      break;
                  case 100:
                      str_details2 = " no_renegotiation";
                      break;
                  case 110:
                      str_details2 = " unsupported_extension";
                      break;
                  case 111:
                      str_details2 = " certificate_unobtainable";
                      break;
                  case 112:
                      str_details2 = " unrecognized_name";
                      break;
                  case 113:
                      str_details2 = " bad_certificate_status_response";
                      break;
                  case 114:
                      str_details2 = " bad_certificate_hash_value";
                      break;
                  case 115:
                      str_details2 = " unknown_psk_identity";
                      break;
                  }
              }
          }
  
          if (content_type == 22) { /* Handshake */
              str_details1 = "???";
  
              if (len > 0) {
                  switch (((const unsigned char *)buf)[0]) {
                  case 0:
                      str_details1 = ", HelloRequest";
                      break;
                  case 1:
                      str_details1 = ", ClientHello";
                      break;
                  case 2:
                      str_details1 = ", ServerHello";
                      break;
                  case 3:
                      str_details1 = ", HelloVerifyRequest";
                      break;
                  case 11:
                      str_details1 = ", Certificate";
                      break;
                  case 12:
                      str_details1 = ", ServerKeyExchange";
                      break;
                  case 13:
                      str_details1 = ", CertificateRequest";
                      break;
                  case 14:
                      str_details1 = ", ServerHelloDone";
                      break;
                  case 15:
                      str_details1 = ", CertificateVerify";
                      break;
                  case 16:
                      str_details1 = ", ClientKeyExchange";
                      break;
                  case 20:
                      str_details1 = ", Finished";
                      break;
                  }
              }
          }
  #ifndef OPENSSL_NO_HEARTBEATS
          if (content_type == 24) { /* Heartbeat */
              str_details1 = ", Heartbeat";
  
              if (len > 0) {
                  switch (((const unsigned char *)buf)[0]) {
                  case 1:
                      str_details1 = ", HeartbeatRequest";
                      break;
                  case 2:
                      str_details1 = ", HeartbeatResponse";
                      break;
                  }
              }
          }
  #endif
      }
  
      BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p, str_version,
                 str_content_type, (unsigned long)len, str_details1,
                 str_details2);
  
      if (len > 0) {
          size_t num, i;
  
          BIO_printf(bio, "   ");
          num = len;
  #if 0
          if (num > 16)
              num = 16;
  #endif
          for (i = 0; i < num; i++) {
              if (i % 16 == 0 && i > 0)
                  BIO_printf(bio, "\n   ");
              BIO_printf(bio, " %02x", ((const unsigned char *)buf)[i]);
          }
          if (i < len)
              BIO_printf(bio, " ...");
          BIO_printf(bio, "\n");
      }
      (void)BIO_flush(bio);
  }
  
  void MS_CALLBACK tlsext_cb(SSL *s, int client_server, int type,
                             unsigned char *data, int len, void *arg)
  {
      BIO *bio = arg;
      char *extname;
  
      switch (type) {
      case TLSEXT_TYPE_server_name:
          extname = "server name";
          break;
  
      case TLSEXT_TYPE_max_fragment_length:
          extname = "max fragment length";
          break;
  
      case TLSEXT_TYPE_client_certificate_url:
          extname = "client certificate URL";
          break;
  
      case TLSEXT_TYPE_trusted_ca_keys:
          extname = "trusted CA keys";
          break;
  
      case TLSEXT_TYPE_truncated_hmac:
          extname = "truncated HMAC";
          break;
  
      case TLSEXT_TYPE_status_request:
          extname = "status request";
          break;
  
      case TLSEXT_TYPE_user_mapping:
          extname = "user mapping";
          break;
  
      case TLSEXT_TYPE_client_authz:
          extname = "client authz";
          break;
  
      case TLSEXT_TYPE_server_authz:
          extname = "server authz";
          break;
  
      case TLSEXT_TYPE_cert_type:
          extname = "cert type";
          break;
  
      case TLSEXT_TYPE_elliptic_curves:
          extname = "elliptic curves";
          break;
  
      case TLSEXT_TYPE_ec_point_formats:
          extname = "EC point formats";
          break;
  
      case TLSEXT_TYPE_srp:
          extname = "SRP";
          break;
  
      case TLSEXT_TYPE_signature_algorithms:
          extname = "signature algorithms";
          break;
  
      case TLSEXT_TYPE_use_srtp:
          extname = "use SRTP";
          break;
  
      case TLSEXT_TYPE_heartbeat:
          extname = "heartbeat";
          break;
  
      case TLSEXT_TYPE_session_ticket:
          extname = "session ticket";
          break;
  
      case TLSEXT_TYPE_renegotiate:
          extname = "renegotiation info";
          break;
  
  #ifdef TLSEXT_TYPE_opaque_prf_input
      case TLSEXT_TYPE_opaque_prf_input:
          extname = "opaque PRF input";
          break;
  #endif
  #ifdef TLSEXT_TYPE_next_proto_neg
      case TLSEXT_TYPE_next_proto_neg:
          extname = "next protocol";
          break;
  #endif
  #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
      case TLSEXT_TYPE_application_layer_protocol_negotiation:
          extname = "application layer protocol negotiation";
          break;
  #endif
  
      case TLSEXT_TYPE_padding:
          extname = "TLS padding";
          break;
  
      default:
          extname = "unknown";
          break;
  
      }
  
      BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
                 client_server ? "server" : "client", extname, type, len);
      BIO_dump(bio, (char *)data, len);
      (void)BIO_flush(bio);
  }
  
  int MS_CALLBACK generate_cookie_callback(SSL *ssl, unsigned char *cookie,
                                           unsigned int *cookie_len)
  {
      unsigned char *buffer, result[EVP_MAX_MD_SIZE];
      unsigned int length, resultlength;
      union {
          struct sockaddr sa;
          struct sockaddr_in s4;
  #if OPENSSL_USE_IPV6
          struct sockaddr_in6 s6;
  #endif
      } peer;
  
      /* Initialize a random secret */
      if (!cookie_initialized) {
          if (RAND_bytes(cookie_secret, COOKIE_SECRET_LENGTH) <= 0) {
              BIO_printf(bio_err, "error setting random cookie secret\n");
              return 0;
          }
          cookie_initialized = 1;
      }
  
      /* Read peer information */
      (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
  
      /* Create buffer with peer's address and port */
      length = 0;
      switch (peer.sa.sa_family) {
      case AF_INET:
          length += sizeof(struct in_addr);
          length += sizeof(peer.s4.sin_port);
          break;
  #if OPENSSL_USE_IPV6
      case AF_INET6:
          length += sizeof(struct in6_addr);
          length += sizeof(peer.s6.sin6_port);
          break;
  #endif
      default:
          OPENSSL_assert(0);
          break;
      }
      buffer = OPENSSL_malloc(length);
  
      if (buffer == NULL) {
          BIO_printf(bio_err, "out of memory\n");
          return 0;
      }
  
      switch (peer.sa.sa_family) {
      case AF_INET:
          memcpy(buffer, &peer.s4.sin_port, sizeof(peer.s4.sin_port));
          memcpy(buffer + sizeof(peer.s4.sin_port),
                 &peer.s4.sin_addr, sizeof(struct in_addr));
          break;
  #if OPENSSL_USE_IPV6
      case AF_INET6:
          memcpy(buffer, &peer.s6.sin6_port, sizeof(peer.s6.sin6_port));
          memcpy(buffer + sizeof(peer.s6.sin6_port),
                 &peer.s6.sin6_addr, sizeof(struct in6_addr));
          break;
  #endif
      default:
          OPENSSL_assert(0);
          break;
      }
  
      /* Calculate HMAC of buffer using the secret */
      HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
           buffer, length, result, &resultlength);
      OPENSSL_free(buffer);
  
      memcpy(cookie, result, resultlength);
      *cookie_len = resultlength;
  
      return 1;
  }
  
  int MS_CALLBACK verify_cookie_callback(SSL *ssl, unsigned char *cookie,
                                         unsigned int cookie_len)
  {
      unsigned char *buffer, result[EVP_MAX_MD_SIZE];
      unsigned int length, resultlength;
      union {
          struct sockaddr sa;
          struct sockaddr_in s4;
  #if OPENSSL_USE_IPV6
          struct sockaddr_in6 s6;
  #endif
      } peer;
  
      /* If secret isn't initialized yet, the cookie can't be valid */
      if (!cookie_initialized)
          return 0;
  
      /* Read peer information */
      (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), &peer);
  
      /* Create buffer with peer's address and port */
      length = 0;
      switch (peer.sa.sa_family) {
      case AF_INET:
          length += sizeof(struct in_addr);
          length += sizeof(peer.s4.sin_port);
          break;
  #if OPENSSL_USE_IPV6
      case AF_INET6:
          length += sizeof(struct in6_addr);
          length += sizeof(peer.s6.sin6_port);
          break;
  #endif
      default:
          OPENSSL_assert(0);
          break;
      }
      buffer = OPENSSL_malloc(length);
  
      if (buffer == NULL) {
          BIO_printf(bio_err, "out of memory\n");
          return 0;
      }
  
      switch (peer.sa.sa_family) {
      case AF_INET:
          memcpy(buffer, &peer.s4.sin_port, sizeof(peer.s4.sin_port));
          memcpy(buffer + sizeof(peer.s4.sin_port),
                 &peer.s4.sin_addr, sizeof(struct in_addr));
          break;
  #if OPENSSL_USE_IPV6
      case AF_INET6:
          memcpy(buffer, &peer.s6.sin6_port, sizeof(peer.s6.sin6_port));
          memcpy(buffer + sizeof(peer.s6.sin6_port),
                 &peer.s6.sin6_addr, sizeof(struct in6_addr));
          break;
  #endif
      default:
          OPENSSL_assert(0);
          break;
      }
  
      /* Calculate HMAC of buffer using the secret */
      HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
           buffer, length, result, &resultlength);
      OPENSSL_free(buffer);
  
      if (cookie_len == resultlength
          && memcmp(result, cookie, resultlength) == 0)
          return 1;
  
      return 0;
  }
  
  /*
   * Example of extended certificate handling. Where the standard support of
   * one certificate per algorithm is not sufficient an application can decide
   * which certificate(s) to use at runtime based on whatever criteria it deems
   * appropriate.
   */
  
  /* Linked list of certificates, keys and chains */
  struct ssl_excert_st {
      int certform;
      const char *certfile;
      int keyform;
      const char *keyfile;
      const char *chainfile;
      X509 *cert;
      EVP_PKEY *key;
      STACK_OF(X509) *chain;
      int build_chain;
      struct ssl_excert_st *next, *prev;
  };
  
  struct chain_flags {
      int flag;
      const char *name;
  };
  
  struct chain_flags chain_flags_list[] = {
      {CERT_PKEY_VALID, "Overall Validity"},
      {CERT_PKEY_SIGN, "Sign with EE key"},
      {CERT_PKEY_EE_SIGNATURE, "EE signature"},
      {CERT_PKEY_CA_SIGNATURE, "CA signature"},
      {CERT_PKEY_EE_PARAM, "EE key parameters"},
      {CERT_PKEY_CA_PARAM, "CA key parameters"},
      {CERT_PKEY_EXPLICIT_SIGN, "Explicity sign with EE key"},
      {CERT_PKEY_ISSUER_NAME, "Issuer Name"},
      {CERT_PKEY_CERT_TYPE, "Certificate Type"},
      {0, NULL}
  };
  
  static void print_chain_flags(BIO *out, SSL *s, int flags)
  {
      struct chain_flags *ctmp = chain_flags_list;
      while (ctmp->name) {
          BIO_printf(out, "\t%s: %s\n", ctmp->name,
                     flags & ctmp->flag ? "OK" : "NOT OK");
          ctmp++;
      }
      BIO_printf(out, "\tSuite B: ");
      if (SSL_set_cert_flags(s, 0) & SSL_CERT_FLAG_SUITEB_128_LOS)
          BIO_puts(out, flags & CERT_PKEY_SUITEB ? "OK\n" : "NOT OK\n");
      else
          BIO_printf(out, "not tested\n");
  }
  
  /*
   * Very basic selection callback: just use any certificate chain reported as
   * valid. More sophisticated could prioritise according to local policy.
   */
  static int set_cert_cb(SSL *ssl, void *arg)
  {
      int i, rv;
      SSL_EXCERT *exc = arg;
  #ifdef CERT_CB_TEST_RETRY
      static int retry_cnt;
      if (retry_cnt < 5) {
          retry_cnt++;
          fprintf(stderr, "Certificate callback retry test: count %d\n",
                  retry_cnt);
          return -1;
      }
  #endif
      SSL_certs_clear(ssl);
  
      if (!exc)
          return 1;
  
      /*
       * Go to end of list and traverse backwards since we prepend newer
       * entries this retains the original order.
       */
      while (exc->next)
          exc = exc->next;
  
      i = 0;
  
      while (exc) {
          i++;
          rv = SSL_check_chain(ssl, exc->cert, exc->key, exc->chain);
          BIO_printf(bio_err, "Checking cert chain %d:\nSubject: ", i);
          X509_NAME_print_ex(bio_err, X509_get_subject_name(exc->cert), 0,
                             XN_FLAG_ONELINE);
          BIO_puts(bio_err, "\n");
  
          print_chain_flags(bio_err, ssl, rv);
          if (rv & CERT_PKEY_VALID) {
              SSL_use_certificate(ssl, exc->cert);
              SSL_use_PrivateKey(ssl, exc->key);
              /*
               * NB: we wouldn't normally do this as it is not efficient
               * building chains on each connection better to cache the chain
               * in advance.
               */
              if (exc->build_chain) {
                  if (!SSL_build_cert_chain(ssl, 0))
                      return 0;
              } else if (exc->chain)
                  SSL_set1_chain(ssl, exc->chain);
          }
          exc = exc->prev;
      }
      return 1;
  }
  
  void ssl_ctx_set_excert(SSL_CTX *ctx, SSL_EXCERT *exc)
  {
      SSL_CTX_set_cert_cb(ctx, set_cert_cb, exc);
  }
  
  static int ssl_excert_prepend(SSL_EXCERT **pexc)
  {
      SSL_EXCERT *exc;
      exc = OPENSSL_malloc(sizeof(SSL_EXCERT));
      if (!exc)
          return 0;
      exc->certfile = NULL;
      exc->keyfile = NULL;
      exc->chainfile = NULL;
      exc->cert = NULL;
      exc->key = NULL;
      exc->chain = NULL;
      exc->prev = NULL;
      exc->build_chain = 0;
  
      exc->next = *pexc;
      *pexc = exc;
  
      if (exc->next) {
          exc->certform = exc->next->certform;
          exc->keyform = exc->next->keyform;
          exc->next->prev = exc;
      } else {
          exc->certform = FORMAT_PEM;
          exc->keyform = FORMAT_PEM;
      }
      return 1;
  
  }
  
  void ssl_excert_free(SSL_EXCERT *exc)
  {
      SSL_EXCERT *curr;
      while (exc) {
          if (exc->cert)
              X509_free(exc->cert);
          if (exc->key)
              EVP_PKEY_free(exc->key);
          if (exc->chain)
              sk_X509_pop_free(exc->chain, X509_free);
          curr = exc;
          exc = exc->next;
          OPENSSL_free(curr);
      }
  }
  
  int load_excert(SSL_EXCERT **pexc, BIO *err)
  {
      SSL_EXCERT *exc = *pexc;
      if (!exc)
          return 1;
      /* If nothing in list, free and set to NULL */
      if (!exc->certfile && !exc->next) {
          ssl_excert_free(exc);
          *pexc = NULL;
          return 1;
      }
      for (; exc; exc = exc->next) {
          if (!exc->certfile) {
              BIO_printf(err, "Missing filename\n");
              return 0;
          }
          exc->cert = load_cert(err, exc->certfile, exc->certform,
                                NULL, NULL, "Server Certificate");
          if (!exc->cert)
              return 0;
          if (exc->keyfile) {
              exc->key = load_key(err, exc->keyfile, exc->keyform,
                                  0, NULL, NULL, "Server Key");
          } else {
              exc->key = load_key(err, exc->certfile, exc->certform,
                                  0, NULL, NULL, "Server Key");
          }
          if (!exc->key)
              return 0;
          if (exc->chainfile) {
              exc->chain = load_certs(err,
                                      exc->chainfile, FORMAT_PEM,
                                      NULL, NULL, "Server Chain");
              if (!exc->chain)
                  return 0;
          }
      }
      return 1;
  }
  
  int args_excert(char ***pargs, int *pargc,
                  int *badarg, BIO *err, SSL_EXCERT **pexc)
  {
      char *arg = **pargs, *argn = (*pargs)[1];
      SSL_EXCERT *exc = *pexc;
      int narg = 2;
      if (!exc) {
          if (ssl_excert_prepend(&exc))
              *pexc = exc;
          else {
              BIO_printf(err, "Error initialising xcert\n");
              *badarg = 1;
              goto err;
          }
      }
      if (strcmp(arg, "-xcert") == 0) {
          if (!argn) {
              *badarg = 1;
              return 1;
          }
          if (exc->certfile && !ssl_excert_prepend(&exc)) {
              BIO_printf(err, "Error adding xcert\n");
              *badarg = 1;
              goto err;
          }
          exc->certfile = argn;
      } else if (strcmp(arg, "-xkey") == 0) {
          if (!argn) {
              *badarg = 1;
              return 1;
          }
          if (exc->keyfile) {
              BIO_printf(err, "Key already specified\n");
              *badarg = 1;
              return 1;
          }
          exc->keyfile = argn;
      } else if (strcmp(arg, "-xchain") == 0) {
          if (!argn) {
              *badarg = 1;
              return 1;
          }
          if (exc->chainfile) {
              BIO_printf(err, "Chain already specified\n");
              *badarg = 1;
              return 1;
          }
          exc->chainfile = argn;
      } else if (strcmp(arg, "-xchain_build") == 0) {
          narg = 1;
          exc->build_chain = 1;
      } else if (strcmp(arg, "-xcertform") == 0) {
          if (!argn) {
              *badarg = 1;
              goto err;
          }
          exc->certform = str2fmt(argn);
      } else if (strcmp(arg, "-xkeyform") == 0) {
          if (!argn) {
              *badarg = 1;
              goto err;
          }
          exc->keyform = str2fmt(argn);
      } else
          return 0;
  
      (*pargs) += narg;
  
      if (pargc)
          *pargc -= narg;
  
      *pexc = exc;
  
      return 1;
  
   err:
      ERR_print_errors(err);
      ssl_excert_free(exc);
      *pexc = NULL;
      return 1;
  }
  
  static void print_raw_cipherlist(BIO *bio, SSL *s)
  {
      const unsigned char *rlist;
      static const unsigned char scsv_id[] = { 0, 0, 0xFF };
      size_t i, rlistlen, num;
      if (!SSL_is_server(s))
          return;
      num = SSL_get0_raw_cipherlist(s, NULL);
      rlistlen = SSL_get0_raw_cipherlist(s, &rlist);
      BIO_puts(bio, "Client cipher list: ");
      for (i = 0; i < rlistlen; i += num, rlist += num) {
          const SSL_CIPHER *c = SSL_CIPHER_find(s, rlist);
          if (i)
              BIO_puts(bio, ":");
          if (c)
              BIO_puts(bio, SSL_CIPHER_get_name(c));
          else if (!memcmp(rlist, scsv_id - num + 3, num))
              BIO_puts(bio, "SCSV");
          else {
              size_t j;
              BIO_puts(bio, "0x");
              for (j = 0; j < num; j++)
                  BIO_printf(bio, "%02X", rlist[j]);
          }
      }
      BIO_puts(bio, "\n");
  }
  
  void print_ssl_summary(BIO *bio, SSL *s)
  {
      const SSL_CIPHER *c;
      X509 *peer;
      /*
       * const char *pnam = SSL_is_server(s) ? "client" : "server";
       */
      BIO_printf(bio, "Protocol version: %s\n", SSL_get_version(s));
      print_raw_cipherlist(bio, s);
      c = SSL_get_current_cipher(s);
      BIO_printf(bio, "Ciphersuite: %s\n", SSL_CIPHER_get_name(c));
      do_print_sigalgs(bio, s, 0);
      peer = SSL_get_peer_certificate(s);
      if (peer) {
          int nid;
          BIO_puts(bio, "Peer certificate: ");
          X509_NAME_print_ex(bio, X509_get_subject_name(peer),
                             0, XN_FLAG_ONELINE);
          BIO_puts(bio, "\n");
          if (SSL_get_peer_signature_nid(s, &nid))
              BIO_printf(bio, "Hash used: %s\n", OBJ_nid2sn(nid));
      } else
          BIO_puts(bio, "No peer certificate\n");
      if (peer)
          X509_free(peer);
  #ifndef OPENSSL_NO_EC
      ssl_print_point_formats(bio, s);
      if (SSL_is_server(s))
          ssl_print_curves(bio, s, 1);
      else
          ssl_print_tmp_key(bio, s);
  #else
      if (!SSL_is_server(s))
          ssl_print_tmp_key(bio, s);
  #endif
  }
  
  int args_ssl(char ***pargs, int *pargc, SSL_CONF_CTX *cctx,
               int *badarg, BIO *err, STACK_OF(OPENSSL_STRING) **pstr,
               int *no_prot_opt)
  {
      char *arg = **pargs, *argn = (*pargs)[1];
      int rv;
  
      if (strcmp(arg, "-no_ssl2") == 0 || strcmp(arg, "-no_ssl3") == 0
          || strcmp(arg, "-no_tls1") == 0 || strcmp(arg, "-no_tls1_1") == 0
          || strcmp(arg, "-no_tls1_2") == 0) {
          *no_prot_opt = 1;
      }
  
      /* Attempt to run SSL configuration command */
      rv = SSL_CONF_cmd_argv(cctx, pargc, pargs);
      /* If parameter not recognised just return */
      if (rv == 0)
          return 0;
      /* see if missing argument error */
      if (rv == -3) {
          BIO_printf(err, "%s needs an argument\n", arg);
          *badarg = 1;
          goto end;
      }
      /* Check for some other error */
      if (rv < 0) {
          BIO_printf(err, "Error with command: \"%s %s\"\n",
                     arg, argn ? argn : "");
          *badarg = 1;
          goto end;
      }
      /* Store command and argument */
      /* If only one argument processed store value as NULL */
      if (rv == 1)
          argn = NULL;
      if (!*pstr)
          *pstr = sk_OPENSSL_STRING_new_null();
      if (!*pstr || !sk_OPENSSL_STRING_push(*pstr, arg) ||
          !sk_OPENSSL_STRING_push(*pstr, argn)) {
          BIO_puts(err, "Memory allocation failure\n");
          goto end;
      }
  
   end:
      if (*badarg)
          ERR_print_errors(err);
  
      return 1;
  }
  
  int args_ssl_call(SSL_CTX *ctx, BIO *err, SSL_CONF_CTX *cctx,
                    STACK_OF(OPENSSL_STRING) *str, int no_ecdhe, int no_jpake)
  {
      int i;
      SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
      for (i = 0; i < sk_OPENSSL_STRING_num(str); i += 2) {
          const char *param = sk_OPENSSL_STRING_value(str, i);
          const char *value = sk_OPENSSL_STRING_value(str, i + 1);
          /*
           * If no_ecdhe or named curve already specified don't need a default.
           */
          if (!no_ecdhe && !strcmp(param, "-named_curve"))
              no_ecdhe = 1;
  #ifndef OPENSSL_NO_JPAKE
          if (!no_jpake && !strcmp(param, "-cipher")) {
              BIO_puts(err, "JPAKE sets cipher to PSK\n");
              return 0;
          }
  #endif
          if (SSL_CONF_cmd(cctx, param, value) <= 0) {
              BIO_printf(err, "Error with command: \"%s %s\"\n",
                         param, value ? value : "");
              ERR_print_errors(err);
              return 0;
          }
      }
      /*
       * This is a special case to keep existing s_server functionality: if we
       * don't have any curve specified *and* we haven't disabled ECDHE then
       * use P-256.
       */
      if (!no_ecdhe) {
          if (SSL_CONF_cmd(cctx, "-named_curve", "P-256") <= 0) {
              BIO_puts(err, "Error setting EC curve\n");
              ERR_print_errors(err);
              return 0;
          }
      }
  #ifndef OPENSSL_NO_JPAKE
      if (!no_jpake) {
          if (SSL_CONF_cmd(cctx, "-cipher", "PSK") <= 0) {
              BIO_puts(err, "Error setting cipher to PSK\n");
              ERR_print_errors(err);
              return 0;
          }
      }
  #endif
      if (!SSL_CONF_CTX_finish(cctx)) {
          BIO_puts(err, "Error finishing context\n");
          ERR_print_errors(err);
          return 0;
      }
      return 1;
  }
  
  static int add_crls_store(X509_STORE *st, STACK_OF(X509_CRL) *crls)
  {
      X509_CRL *crl;
      int i;
      for (i = 0; i < sk_X509_CRL_num(crls); i++) {
          crl = sk_X509_CRL_value(crls, i);
          X509_STORE_add_crl(st, crl);
      }
      return 1;
  }
  
  int ssl_ctx_add_crls(SSL_CTX *ctx, STACK_OF(X509_CRL) *crls, int crl_download)
  {
      X509_STORE *st;
      st = SSL_CTX_get_cert_store(ctx);
      add_crls_store(st, crls);
      if (crl_download)
          store_setup_crl_download(st);
      return 1;
  }
  
  int ssl_load_stores(SSL_CTX *ctx,
                      const char *vfyCApath, const char *vfyCAfile,
                      const char *chCApath, const char *chCAfile,
                      STACK_OF(X509_CRL) *crls, int crl_download)
  {
      X509_STORE *vfy = NULL, *ch = NULL;
      int rv = 0;
      if (vfyCApath || vfyCAfile) {
          vfy = X509_STORE_new();
          if (!X509_STORE_load_locations(vfy, vfyCAfile, vfyCApath))
              goto err;
          add_crls_store(vfy, crls);
          SSL_CTX_set1_verify_cert_store(ctx, vfy);
          if (crl_download)
              store_setup_crl_download(vfy);
      }
      if (chCApath || chCAfile) {
          ch = X509_STORE_new();
          if (!X509_STORE_load_locations(ch, chCAfile, chCApath))
              goto err;
          SSL_CTX_set1_chain_cert_store(ctx, ch);
      }
      rv = 1;
   err:
      if (vfy)
          X509_STORE_free(vfy);
      if (ch)
          X509_STORE_free(ch);
      return rv;
  }
  