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.]
   */
  /* ====================================================================
   * 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).
   *
   */
  
  /* callback functions used by s_client, s_server, and s_time */
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h> /* for memcpy() and strcmp() */
  #define USE_SOCKETS
  #include "apps.h"
  #undef USE_SOCKETS
  #include <openssl/err.h>
  #include <openssl/rand.h>
  #include <openssl/x509.h>
  #include <openssl/ssl.h>
  #include <openssl/bn.h>
  #ifndef OPENSSL_NO_DH
  # include <openssl/dh.h>
  #endif
  #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;
  #ifndef OPENSSL_NO_SOCK
  static unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
  static int cookie_initialized = 0;
  #endif
  
  static const char *lookup(int val, const STRINT_PAIR* list, const char* def)
  {
      for ( ; list->name; ++list)
          if (list->retval == val)
              return list->name;
      return def;
  }
  
  int 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 = err;
          } 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(ctx);
          break;
      }
      if (err == X509_V_OK && ok == 2 && !verify_quiet)
          policies_print(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) {
          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);
          }
  
          /*
           * 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 STRINT_PAIR cert_type_list[] = {
      {"RSA sign", TLS_CT_RSA_SIGN},
      {"DSA sign", TLS_CT_DSS_SIGN},
      {"RSA fixed DH", TLS_CT_RSA_FIXED_DH},
      {"DSS fixed DH", TLS_CT_DSS_FIXED_DH},
      {"ECDSA sign", TLS_CT_ECDSA_SIGN},
      {"RSA fixed ECDH", TLS_CT_RSA_FIXED_ECDH},
      {"ECDSA fixed ECDH", TLS_CT_ECDSA_FIXED_ECDH},
      {"GOST01 Sign", TLS_CT_GOST01_SIGN},
      {NULL}
  };
  
  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];
          const char *cname = lookup((int)cert_type, cert_type_list, 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 = app_malloc(ncurves * sizeof(int), "curves to print");
      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_EC
      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 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 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));
          }
      }
  }
  
  static STRINT_PAIR ssl_versions[] = {
      {"SSL 3.0", SSL3_VERSION},
      {"TLS 1.0", TLS1_VERSION},
      {"TLS 1.1", TLS1_1_VERSION},
      {"TLS 1.2", TLS1_2_VERSION},
      {"DTLS 1.0", DTLS1_VERSION},
      {"DTLS 1.0 (bad)", DTLS1_BAD_VER},
      {NULL}
  };
  static STRINT_PAIR alert_types[] = {
      {" close_notify", 0},
      {" unexpected_message", 10},
      {" bad_record_mac", 20},
      {" decryption_failed", 21},
      {" record_overflow", 22},
      {" decompression_failure", 30},
      {" handshake_failure", 40},
      {" bad_certificate", 42},
      {" unsupported_certificate", 43},
      {" certificate_revoked", 44},
      {" certificate_expired", 45},
      {" certificate_unknown", 46},
      {" illegal_parameter", 47},
      {" unknown_ca", 48},
      {" access_denied", 49},
      {" decode_error", 50},
      {" decrypt_error", 51},
      {" export_restriction", 60},
      {" protocol_version", 70},
      {" insufficient_security", 71},
      {" internal_error", 80},
      {" user_canceled", 90},
      {" no_renegotiation", 100},
      {" unsupported_extension", 110},
      {" certificate_unobtainable", 111},
      {" unrecognized_name", 112},
      {" bad_certificate_status_response", 113},
      {" bad_certificate_hash_value", 114},
      {" unknown_psk_identity", 115},
      {NULL}
  };
  
  static STRINT_PAIR handshakes[] = {
      {", HelloRequest", 0},
      {", ClientHello", 1},
      {", ServerHello", 2},
      {", HelloVerifyRequest", 3},
      {", NewSessionTicket", 4},
      {", Certificate", 11},
      {", ServerKeyExchange", 12},
      {", CertificateRequest", 13},
      {", ServerHelloDone", 14},
      {", CertificateVerify", 15},
      {", ClientKeyExchange", 16},
      {", Finished", 20},
      {", CertificateUrl", 21},
      {", CertificateStatus", 22},
      {", SupplementalData", 23},
      {NULL}
  };
  
  void 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 = write_p ? ">>>" : "<<<";
      const char *str_version = lookup(version, ssl_versions, "???");
      const char *str_content_type = "", *str_details1 = "", *str_details2 = "";
      const unsigned char* bp = buf;
  
      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";
              str_details1 = ", ???";
              if (len == 2) {
                  switch (bp[0]) {
                  case 1:
                      str_details1 = ", warning";
                      break;
                  case 2:
                      str_details1 = ", fatal";
                      break;
                  }
                  str_details2 = lookup((int)bp[1], alert_types, " ???");
              }
              break;
          case 22:
              str_content_type = "Handshake";
              str_details1 = "???";
              if (len > 0)
                  str_details1 = lookup((int)bp[0], handshakes, "???");
              break;
          case 23:
              str_content_type = "ApplicationData";
              break;
  #ifndef OPENSSL_NO_HEARTBEATS
          case 24:
              str_details1 = ", Heartbeat";
  
              if (len > 0) {
                  switch (bp[0]) {
                  case 1:
                      str_details1 = ", HeartbeatRequest";
                      break;
                  case 2:
                      str_details1 = ", HeartbeatResponse";
                      break;
                  }
              }
              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;
          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);
  }
  
  static STRINT_PAIR tlsext_types[] = {
      {"server name", TLSEXT_TYPE_server_name},
      {"max fragment length", TLSEXT_TYPE_max_fragment_length},
      {"client certificate URL", TLSEXT_TYPE_client_certificate_url},
      {"trusted CA keys", TLSEXT_TYPE_trusted_ca_keys},
      {"truncated HMAC", TLSEXT_TYPE_truncated_hmac},
      {"status request", TLSEXT_TYPE_status_request},
      {"user mapping", TLSEXT_TYPE_user_mapping},
      {"client authz", TLSEXT_TYPE_client_authz},
      {"server authz", TLSEXT_TYPE_server_authz},
      {"cert type", TLSEXT_TYPE_cert_type},
      {"elliptic curves", TLSEXT_TYPE_elliptic_curves},
      {"EC point formats", TLSEXT_TYPE_ec_point_formats},
      {"SRP", TLSEXT_TYPE_srp},
      {"signature algorithms", TLSEXT_TYPE_signature_algorithms},
      {"use SRTP", TLSEXT_TYPE_use_srtp},
      {"heartbeat", TLSEXT_TYPE_heartbeat},
      {"session ticket", TLSEXT_TYPE_session_ticket},
      {"renegotiation info", TLSEXT_TYPE_renegotiate},
      {"signed certificate timestamps", TLSEXT_TYPE_signed_certificate_timestamp},
      {"TLS padding", TLSEXT_TYPE_padding},
  #ifdef TLSEXT_TYPE_next_proto_neg
      {"next protocol", TLSEXT_TYPE_next_proto_neg},
  #endif
  #ifdef TLSEXT_TYPE_encrypt_then_mac
      {"encrypt-then-mac", TLSEXT_TYPE_encrypt_then_mac},
  #endif
  #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
      {"application layer protocol negotiation",
       TLSEXT_TYPE_application_layer_protocol_negotiation},
  #endif
  #ifdef TLSEXT_TYPE_extended_master_secret
      {"extended master secret", TLSEXT_TYPE_extended_master_secret},
  #endif
      {NULL}
  };
  
  void tlsext_cb(SSL *s, int client_server, int type,
                 const unsigned char *data, int len, void *arg)
  {
      BIO *bio = arg;
      const char *extname = lookup(type, tlsext_types, "unknown");
  
      BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
                 client_server ? "server" : "client", extname, type, len);
      BIO_dump(bio, (const char *)data, len);
      (void)BIO_flush(bio);
  }
  
  #ifndef OPENSSL_NO_SOCK
  int generate_cookie_callback(SSL *ssl, unsigned char *cookie,
                               unsigned int *cookie_len)
  {
      unsigned char *buffer;
      size_t length;
      unsigned short port;
      BIO_ADDR *peer = NULL;
  
      /* 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;
      }
  
      peer = BIO_ADDR_new();
      if (peer == NULL) {
          BIO_printf(bio_err, "memory full\n");
          return 0;
      }
  
      /* Read peer information */
      (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), peer);
  
      /* Create buffer with peer's address and port */
      BIO_ADDR_rawaddress(peer, NULL, &length);
      OPENSSL_assert(length != 0);
      port = BIO_ADDR_rawport(peer);
      length += sizeof(port);
      buffer = app_malloc(length, "cookie generate buffer");
  
      memcpy(buffer, &port, sizeof(port));
      BIO_ADDR_rawaddress(peer, buffer + sizeof(port), NULL);
  
      /* Calculate HMAC of buffer using the secret */
      HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
           buffer, length, cookie, cookie_len);
  
      OPENSSL_free(buffer);
      BIO_ADDR_free(peer);
  
      return 1;
  }
  
  int verify_cookie_callback(SSL *ssl, const unsigned char *cookie,
                             unsigned int cookie_len)
  {
      unsigned char result[EVP_MAX_MD_SIZE];
      unsigned int resultlength;
  
      /* Note: we check cookie_initialized because if it's not,
       * it cannot be valid */
      if (cookie_initialized
          && generate_cookie_callback(ssl, result, &resultlength)
          && cookie_len == resultlength
          && memcmp(result, cookie, resultlength) == 0)
          return 1;
  
      return 0;
  }
  #endif
  
  /*
   * 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;
  };
  
  static STRINT_PAIR chain_flags[] = {
      {"Overall Validity", CERT_PKEY_VALID},
      {"Sign with EE key", CERT_PKEY_SIGN},
      {"EE signature", CERT_PKEY_EE_SIGNATURE},
      {"CA signature", CERT_PKEY_CA_SIGNATURE},
      {"EE key parameters", CERT_PKEY_EE_PARAM},
      {"CA key parameters", CERT_PKEY_CA_PARAM},
      {"Explicitly sign with EE key", CERT_PKEY_EXPLICIT_SIGN},
      {"Issuer Name", CERT_PKEY_ISSUER_NAME},
      {"Certificate Type", CERT_PKEY_CERT_TYPE},
      {NULL}
  };
  
  static void print_chain_flags(SSL *s, int flags)
  {
      STRINT_PAIR *pp;
  
      for (pp = chain_flags; pp->name; ++pp)
          BIO_printf(bio_err, "\t%s: %s\n",
                     pp->name,
                     (flags & pp->retval) ? "OK" : "NOT OK");
      BIO_printf(bio_err, "\tSuite B: ");
      if (SSL_set_cert_flags(s, 0) & SSL_CERT_FLAG_SUITEB_128_LOS)
          BIO_puts(bio_err, flags & CERT_PKEY_SUITEB ? "OK\n" : "NOT OK\n");
      else
          BIO_printf(bio_err, "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++;
          BIO_printf(bio_err,
                     "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(ssl, rv);
          if (rv & CERT_PKEY_VALID) {
              if (!SSL_use_certificate(ssl, exc->cert)
                      || !SSL_use_PrivateKey(ssl, exc->key)) {
                  return 0;
              }
              /*
               * 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 = app_malloc(sizeof(*exc), "prepend cert");
  
      memset(exc, 0, sizeof(*exc));
  
      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;
  
      if (!exc)
          return;
      while (exc) {
          X509_free(exc->cert);
          EVP_PKEY_free(exc->key);
          sk_X509_pop_free(exc->chain, X509_free);
          curr = exc;
          exc = exc->next;
          OPENSSL_free(curr);
      }
  }
  
  int load_excert(SSL_EXCERT **pexc)
  {
      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(bio_err, "Missing filename\n");
              return 0;
          }
          exc->cert = load_cert(exc->certfile, exc->certform,
                                "Server Certificate");
          if (!exc->cert)
              return 0;
          if (exc->keyfile) {
              exc->key = load_key(exc->keyfile, exc->keyform,
                                  0, NULL, NULL, "Server Key");
          } else {
              exc->key = load_key(exc->certfile, exc->certform,
                                  0, NULL, NULL, "Server Key");
          }
          if (!exc->key)
              return 0;
          if (exc->chainfile) {
              if (!load_certs(exc->chainfile, &exc->chain, FORMAT_PEM, NULL,
                              "Server Chain"))
                  return 0;
          }
      }
      return 1;
  }
  
  enum range { OPT_X_ENUM };
  
  int args_excert(int opt, SSL_EXCERT **pexc)
  {
      SSL_EXCERT *exc = *pexc;
  
      assert(opt > OPT_X__FIRST);
      assert(opt < OPT_X__LAST);
  
      if (exc == NULL) {
          if (!ssl_excert_prepend(&exc)) {
              BIO_printf(bio_err, " %s: Error initialising xcert\n",
                         opt_getprog());
              goto err;
          }
          *pexc = exc;
      }
  
      switch ((enum range)opt) {
      case OPT_X__FIRST:
      case OPT_X__LAST:
          return 0;
      case OPT_X_CERT:
          if (exc->certfile && !ssl_excert_prepend(&exc)) {
              BIO_printf(bio_err, "%s: Error adding xcert\n", opt_getprog());
              goto err;
          }
          exc->certfile = opt_arg();
          break;
      case OPT_X_KEY:
          if (exc->keyfile) {
              BIO_printf(bio_err, "%s: Key already specified\n", opt_getprog());
              goto err;
          }
          exc->keyfile = opt_arg();
          break;
      case OPT_X_CHAIN:
          if (exc->chainfile) {
              BIO_printf(bio_err, "%s: Chain already specified\n",
                         opt_getprog());
              goto err;
          }
          exc->chainfile = opt_arg();
          break;
      case OPT_X_CHAIN_BUILD:
          exc->build_chain = 1;
          break;
      case OPT_X_CERTFORM:
          if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->certform))
              return 0;
          break;
      case OPT_X_KEYFORM:
          if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->keyform))
              return 0;
          break;
      }
      return 1;
  
   err:
      ERR_print_errors(bio_err);
      ssl_excert_free(exc);
      *pexc = NULL;
      return 0;
  }
  
  static void print_raw_cipherlist(SSL *s)
  {
      const unsigned char *rlist;
      static const unsigned char scsv_id[] = { 0, 0xFF };
      size_t i, rlistlen, num;
      if (!SSL_is_server(s))
          return;
      num = SSL_get0_raw_cipherlist(s, NULL);
      OPENSSL_assert(num == 2);
      rlistlen = SSL_get0_raw_cipherlist(s, &rlist);
      BIO_puts(bio_err, "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_err, ":");
          if (c)
              BIO_puts(bio_err, SSL_CIPHER_get_name(c));
          else if (!memcmp(rlist, scsv_id, num))
              BIO_puts(bio_err, "SCSV");
          else {
              size_t j;
              BIO_puts(bio_err, "0x");
              for (j = 0; j < num; j++)
                  BIO_printf(bio_err, "%02X", rlist[j]);
          }
      }
      BIO_puts(bio_err, "\n");
  }
  
  /*
   * Hex encoder for TLSA RRdata, not ':' delimited.
   */
  static char *hexencode(const unsigned char *data, size_t len)
  {
      static const char *hex = "0123456789abcdef";
      char *out;
      char *cp;
      size_t outlen = 2 * len + 1;
      int ilen = (int) outlen;
  
      if (outlen < len || ilen < 0 || outlen != (size_t)ilen) {
          BIO_printf(bio_err, "%s: %" PRIu64 "-byte buffer too large to hexencode\n",
                     opt_getprog(), (uint64_t)len);
          exit(1);
      }
      cp = out = app_malloc(ilen, "TLSA hex data buffer");
  
      while (len-- > 0) {
          *cp++ = hex[(*data >> 4) & 0x0f];
          *cp++ = hex[*data++ & 0x0f];
      }
      *cp = '\0';
      return out;
  }
  
  void print_verify_detail(SSL *s, BIO *bio)
  {
      int mdpth;
      EVP_PKEY *mspki;
      long verify_err = SSL_get_verify_result(s);
  
      if (verify_err == X509_V_OK) {
          const char *peername = SSL_get0_peername(s);
  
          BIO_printf(bio, "Verification: OK\n");
          if (peername != NULL)
              BIO_printf(bio, "Verified peername: %s\n", peername);
      } else {
          const char *reason = X509_verify_cert_error_string(verify_err);
  
          BIO_printf(bio, "Verification error: %s\n", reason);
      }
  
      if ((mdpth = SSL_get0_dane_authority(s, NULL, &mspki)) >= 0) {
          uint8_t usage, selector, mtype;
          const unsigned char *data = NULL;
          size_t dlen = 0;
          char *hexdata;
  
          mdpth = SSL_get0_dane_tlsa(s, &usage, &selector, &mtype, &data, &dlen);
  
          /*
           * The TLSA data field can be quite long when it is a certificate,
           * public key or even a SHA2-512 digest.  Because the initial octets of
           * ASN.1 certificates and public keys contain mostly boilerplate OIDs
           * and lengths, we show the last 12 bytes of the data instead, as these
           * are more likely to distinguish distinct TLSA records.
           */
  #define TLSA_TAIL_SIZE 12
          if (dlen > TLSA_TAIL_SIZE)
              hexdata = hexencode(data + dlen - TLSA_TAIL_SIZE, TLSA_TAIL_SIZE);
          else
              hexdata = hexencode(data, dlen);
          BIO_printf(bio, "DANE TLSA %d %d %d %s%s %s at depth %d\n",
                     usage, selector, mtype,
                     (dlen > TLSA_TAIL_SIZE) ? "..." : "", hexdata,
                     (mspki != NULL) ? "signed the certificate" :
                     mdpth ? "matched TA certificate" : "matched EE certificate",
                     mdpth);
          OPENSSL_free(hexdata);
      }
  }
  
  void print_ssl_summary(SSL *s)
  {
      const SSL_CIPHER *c;
      X509 *peer;
      /* const char *pnam = SSL_is_server(s) ? "client" : "server"; */
  
      BIO_printf(bio_err, "Protocol version: %s\n", SSL_get_version(s));
      print_raw_cipherlist(s);
      c = SSL_get_current_cipher(s);
      BIO_printf(bio_err, "Ciphersuite: %s\n", SSL_CIPHER_get_name(c));
      do_print_sigalgs(bio_err, s, 0);
      peer = SSL_get_peer_certificate(s);
      if (peer) {
          int nid;
  
          BIO_puts(bio_err, "Peer certificate: ");
          X509_NAME_print_ex(bio_err, X509_get_subject_name(peer),
                             0, XN_FLAG_ONELINE);
          BIO_puts(bio_err, "\n");
          if (SSL_get_peer_signature_nid(s, &nid))
              BIO_printf(bio_err, "Hash used: %s\n", OBJ_nid2sn(nid));
          print_verify_detail(s, bio_err);
      } else
          BIO_puts(bio_err, "No peer certificate\n");
      X509_free(peer);
  #ifndef OPENSSL_NO_EC
      ssl_print_point_formats(bio_err, s);
      if (SSL_is_server(s))
          ssl_print_curves(bio_err, s, 1);
      else
          ssl_print_tmp_key(bio_err, s);
  #else
      if (!SSL_is_server(s))
          ssl_print_tmp_key(bio_err, s);
  #endif
  }
  
  int config_ctx(SSL_CONF_CTX *cctx, STACK_OF(OPENSSL_STRING) *str,
                 SSL_CTX *ctx)
  {
      int i;
  
      SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
      for (i = 0; i < sk_OPENSSL_STRING_num(str); i += 2) {
          const char *flag = sk_OPENSSL_STRING_value(str, i);
          const char *arg = sk_OPENSSL_STRING_value(str, i + 1);
          if (SSL_CONF_cmd(cctx, flag, arg) <= 0) {
              if (arg)
                  BIO_printf(bio_err, "Error with command: \"%s %s\"\n",
                             flag, arg);
              else
                  BIO_printf(bio_err, "Error with command: \"%s\"\n", flag);
              ERR_print_errors(bio_err);
              return 0;
          }
      }
      if (!SSL_CONF_CTX_finish(cctx)) {
          BIO_puts(bio_err, "Error finishing context\n");
          ERR_print_errors(bio_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 != NULL || vfyCAfile != NULL) {
          vfy = X509_STORE_new();
          if (vfy == NULL)
              goto err;
          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 != NULL || chCAfile != NULL) {
          ch = X509_STORE_new();
          if (ch == NULL)
              goto err;
          if (!X509_STORE_load_locations(ch, chCAfile, chCApath))
              goto err;
          SSL_CTX_set1_chain_cert_store(ctx, ch);
      }
      rv = 1;
   err:
      X509_STORE_free(vfy);
      X509_STORE_free(ch);
      return rv;
  }
  
  /* Verbose print out of security callback */
  
  typedef struct {
      BIO *out;
      int verbose;
      int (*old_cb) (const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid,
                     void *other, void *ex);
  } security_debug_ex;
  
  static STRINT_PAIR callback_types[] = {
      {"Supported Ciphersuite", SSL_SECOP_CIPHER_SUPPORTED},
      {"Shared Ciphersuite", SSL_SECOP_CIPHER_SHARED},
      {"Check Ciphersuite", SSL_SECOP_CIPHER_CHECK},
  #ifndef OPENSSL_NO_DH
      {"Temp DH key bits", SSL_SECOP_TMP_DH},
  #endif
      {"Supported Curve", SSL_SECOP_CURVE_SUPPORTED},
      {"Shared Curve", SSL_SECOP_CURVE_SHARED},
      {"Check Curve", SSL_SECOP_CURVE_CHECK},
      {"Supported Signature Algorithm digest", SSL_SECOP_SIGALG_SUPPORTED},
      {"Shared Signature Algorithm digest", SSL_SECOP_SIGALG_SHARED},
      {"Check Signature Algorithm digest", SSL_SECOP_SIGALG_CHECK},
      {"Signature Algorithm mask", SSL_SECOP_SIGALG_MASK},
      {"Certificate chain EE key", SSL_SECOP_EE_KEY},
      {"Certificate chain CA key", SSL_SECOP_CA_KEY},
      {"Peer Chain EE key", SSL_SECOP_PEER_EE_KEY},
      {"Peer Chain CA key", SSL_SECOP_PEER_CA_KEY},
      {"Certificate chain CA digest", SSL_SECOP_CA_MD},
      {"Peer chain CA digest", SSL_SECOP_PEER_CA_MD},
      {"SSL compression", SSL_SECOP_COMPRESSION},
      {"Session ticket", SSL_SECOP_TICKET},
      {NULL}
  };
  
  static int security_callback_debug(const SSL *s, const SSL_CTX *ctx,
                                     int op, int bits, int nid,
                                     void *other, void *ex)
  {
      security_debug_ex *sdb = ex;
      int rv, show_bits = 1, cert_md = 0;
      const char *nm;
      rv = sdb->old_cb(s, ctx, op, bits, nid, other, ex);
      if (rv == 1 && sdb->verbose < 2)
          return 1;
      BIO_puts(sdb->out, "Security callback: ");
  
      nm = lookup(op, callback_types, NULL);
      switch (op) {
      case SSL_SECOP_TICKET:
      case SSL_SECOP_COMPRESSION:
          show_bits = 0;
          nm = NULL;
          break;
      case SSL_SECOP_VERSION:
          BIO_printf(sdb->out, "Version=%s", lookup(nid, ssl_versions, "???"));
          show_bits = 0;
          nm = NULL;
          break;
      case SSL_SECOP_CA_MD:
      case SSL_SECOP_PEER_CA_MD:
          cert_md = 1;
          break;
      }
      if (nm)
          BIO_printf(sdb->out, "%s=", nm);
  
      switch (op & SSL_SECOP_OTHER_TYPE) {
  
      case SSL_SECOP_OTHER_CIPHER:
          BIO_puts(sdb->out, SSL_CIPHER_get_name(other));
          break;
  
  #ifndef OPENSSL_NO_EC
      case SSL_SECOP_OTHER_CURVE:
          {
              const char *cname;
              cname = EC_curve_nid2nist(nid);
              if (cname == NULL)
                  cname = OBJ_nid2sn(nid);
              BIO_puts(sdb->out, cname);
          }
          break;
  #endif
  #ifndef OPENSSL_NO_DH
      case SSL_SECOP_OTHER_DH:
          {
              DH *dh = other;
              BIO_printf(sdb->out, "%d", BN_num_bits(dh->p));
              break;
          }
  #endif
      case SSL_SECOP_OTHER_CERT:
          {
              if (cert_md) {
                  int sig_nid = X509_get_signature_nid(other);
                  BIO_puts(sdb->out, OBJ_nid2sn(sig_nid));
              } else {
                  EVP_PKEY *pkey = X509_get0_pubkey(other);
                  const char *algname = "";
                  EVP_PKEY_asn1_get0_info(NULL, NULL, NULL, NULL,
                                          &algname, EVP_PKEY_get0_asn1(pkey));
                  BIO_printf(sdb->out, "%s, bits=%d",
                             algname, EVP_PKEY_bits(pkey));
              }
              break;
          }
      case SSL_SECOP_OTHER_SIGALG:
          {
              const unsigned char *salg = other;
              const char *sname = NULL;
              switch (salg[1]) {
              case TLSEXT_signature_anonymous:
                  sname = "anonymous";
                  break;
              case TLSEXT_signature_rsa:
                  sname = "RSA";
                  break;
              case TLSEXT_signature_dsa:
                  sname = "DSA";
                  break;
              case TLSEXT_signature_ecdsa:
                  sname = "ECDSA";
                  break;
              }
  
              BIO_puts(sdb->out, OBJ_nid2sn(nid));
              if (sname)
                  BIO_printf(sdb->out, ", algorithm=%s", sname);
              else
                  BIO_printf(sdb->out, ", algid=%d", salg[1]);
              break;
          }
  
      }
  
      if (show_bits)
          BIO_printf(sdb->out, ", security bits=%d", bits);
      BIO_printf(sdb->out, ": %s\n", rv ? "yes" : "no");
      return rv;
  }
  
  void ssl_ctx_security_debug(SSL_CTX *ctx, int verbose)
  {
      static security_debug_ex sdb;
  
      sdb.out = bio_err;
      sdb.verbose = verbose;
      sdb.old_cb = SSL_CTX_get_security_callback(ctx);
      SSL_CTX_set_security_callback(ctx, security_callback_debug);
      SSL_CTX_set0_security_ex_data(ctx, &sdb);
  }
  