text: /* Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef SSL_PRIVATE_H
  #define SSL_PRIVATE_H
  
  /**
   * @file  ssl_private.h 
   * @brief Internal interfaces private to mod_ssl.
   *
   * @defgroup MOD_SSL_PRIVATE Private
   * @ingroup MOD_SSL
   * @{
   */
  
  /** Apache headers */
  #include "httpd.h"
  #include "http_config.h"
  #include "http_core.h"
  #include "http_log.h"
  #include "http_main.h"
  #include "http_connection.h"
  #include "http_request.h"
  #include "http_protocol.h"
  #include "http_vhost.h"
  #include "util_script.h"
  #include "util_filter.h"
  #include "util_ebcdic.h"
  #include "mpm.h"
  #include "apr.h"
  #include "apr_strings.h"
  #define APR_WANT_STRFUNC
  #include "apr_want.h"
  #include "apr_tables.h"
  #include "apr_lib.h"
  #include "apr_fnmatch.h"
  #include "apr_strings.h"
  #include "apr_dbm.h"
  #include "apr_rmm.h"
  #include "apr_shm.h"
  #include "apr_global_mutex.h"
  #include "apr_optional.h"
  
  #define MOD_SSL_VERSION AP_SERVER_BASEREVISION
  
  /** mod_ssl headers */
  #include "ssl_toolkit_compat.h"
  #include "ssl_expr.h"
  #include "ssl_util_ssl.h"
  
  /** The #ifdef macros are only defined AFTER including the above
   * therefore we cannot include these system files at the top  :-(
   */
  #if APR_HAVE_SYS_TIME_H
  #include <sys/time.h>
  #endif
  #if APR_HAVE_UNISTD_H
  #include <unistd.h> /** needed for STDIN_FILENO et.al., at least on FreeBSD */
  #endif
  
  /**
   * Provide reasonable default for some defines
   */
  #ifndef FALSE
  #define FALSE (0)
  #endif
  #ifndef TRUE
  #define TRUE (!FALSE)
  #endif
  #ifndef PFALSE
  #define PFALSE ((void *)FALSE)
  #endif
  #ifndef PTRUE
  #define PTRUE ((void *)TRUE)
  #endif
  #ifndef UNSET
  #define UNSET (-1)
  #endif
  #ifndef NUL
  #define NUL '\0'
  #endif
  #ifndef RAND_MAX
  #include <limits.h>
  #define RAND_MAX INT_MAX
  #endif
  
  /**
   * Provide reasonable defines for some types
   */
  #ifndef BOOL
  #define BOOL unsigned int
  #endif
  #ifndef UCHAR
  #define UCHAR unsigned char
  #endif
  
  /**
   * Provide useful shorthands
   */
  #define strEQ(s1,s2)     (strcmp(s1,s2)        == 0)
  #define strNE(s1,s2)     (strcmp(s1,s2)        != 0)
  #define strEQn(s1,s2,n)  (strncmp(s1,s2,n)     == 0)
  #define strNEn(s1,s2,n)  (strncmp(s1,s2,n)     != 0)
  
  #define strcEQ(s1,s2)    (strcasecmp(s1,s2)    == 0)
  #define strcNE(s1,s2)    (strcasecmp(s1,s2)    != 0)
  #define strcEQn(s1,s2,n) (strncasecmp(s1,s2,n) == 0)
  #define strcNEn(s1,s2,n) (strncasecmp(s1,s2,n) != 0)
  
  #define strIsEmpty(s)    (s == NULL || s[0] == NUL)
  
  #define myConnConfig(c) \
  (SSLConnRec *)ap_get_module_config(c->conn_config, &ssl_module)
  #define myCtxConfig(sslconn, sc) (sslconn->is_proxy ? sc->proxy : sc->server)
  #define myConnConfigSet(c, val) \
  ap_set_module_config(c->conn_config, &ssl_module, val)
  #define mySrvConfig(srv) (SSLSrvConfigRec *)ap_get_module_config(srv->module_config,  &ssl_module)
  #define myDirConfig(req) (SSLDirConfigRec *)ap_get_module_config(req->per_dir_config, &ssl_module)
  #define myModConfig(srv) (mySrvConfig((srv)))->mc
  #define mySrvFromConn(c) (myConnConfig(c))->server
  #define mySrvConfigFromConn(c) mySrvConfig(mySrvFromConn(c))
  #define myModConfigFromConn(c) myModConfig(mySrvFromConn(c))
  
  #define myCtxVarSet(mc,num,val)  mc->rCtx.pV##num = val
  #define myCtxVarGet(mc,num,type) (type)(mc->rCtx.pV##num)
  
  /**
   * Defaults for the configuration
   */
  #ifndef SSL_SESSION_CACHE_TIMEOUT
  #define SSL_SESSION_CACHE_TIMEOUT  300
  #endif
  
  /* Default setting for per-dir reneg buffer. */
  #ifndef DEFAULT_RENEG_BUFFER_SIZE
  #define DEFAULT_RENEG_BUFFER_SIZE (128 * 1024)
  #endif
  
  /**
   * Support for MM library
   */
  #define SSL_MM_FILE_MODE ( APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD )
  
  /**
   * Support for DBM library
   */
  #define SSL_DBM_FILE_MODE ( APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD )
  
  #if !defined(SSL_DBM_FILE_SUFFIX_DIR) && !defined(SSL_DBM_FILE_SUFFIX_PAG)
  #if defined(DBM_SUFFIX)
  #define SSL_DBM_FILE_SUFFIX_DIR DBM_SUFFIX
  #define SSL_DBM_FILE_SUFFIX_PAG DBM_SUFFIX
  #elif defined(__FreeBSD__) || (defined(DB_LOCK) && defined(DB_SHMEM))
  #define SSL_DBM_FILE_SUFFIX_DIR ".db"
  #define SSL_DBM_FILE_SUFFIX_PAG ".db"
  #else
  #define SSL_DBM_FILE_SUFFIX_DIR ".dir"
  #define SSL_DBM_FILE_SUFFIX_PAG ".pag"
  #endif
  #endif
  
  /**
   * Define the certificate algorithm types
   */
  
  typedef int ssl_algo_t;
  
  #define SSL_ALGO_UNKNOWN (0)
  #define SSL_ALGO_RSA     (1<<0)
  #define SSL_ALGO_DSA     (1<<1)
  #define SSL_ALGO_ALL     (SSL_ALGO_RSA|SSL_ALGO_DSA)
  
  #define SSL_AIDX_RSA     (0)
  #define SSL_AIDX_DSA     (1)
  #define SSL_AIDX_MAX     (2)
  
  
  /**
   * Define IDs for the temporary RSA keys and DH params
   */
  
  #define SSL_TMP_KEY_RSA_512  (0)
  #define SSL_TMP_KEY_RSA_1024 (1)
  #define SSL_TMP_KEY_DH_512   (2)
  #define SSL_TMP_KEY_DH_1024  (3)
  #define SSL_TMP_KEY_MAX      (4)
  
  /**
   * Define the SSL options
   */
  #define SSL_OPT_NONE           (0)
  #define SSL_OPT_RELSET         (1<<0)
  #define SSL_OPT_STDENVVARS     (1<<1)
  #define SSL_OPT_EXPORTCERTDATA (1<<3)
  #define SSL_OPT_FAKEBASICAUTH  (1<<4)
  #define SSL_OPT_STRICTREQUIRE  (1<<5)
  #define SSL_OPT_OPTRENEGOTIATE (1<<6)
  #define SSL_OPT_ALL            (SSL_OPT_STDENVVARS|SSL_OPT_EXPORTCERTDATA|SSL_OPT_FAKEBASICAUTH|SSL_OPT_STRICTREQUIRE|SSL_OPT_OPTRENEGOTIATE)
  typedef int ssl_opt_t;
  
  /**
   * Define the SSL Protocol options
   */
  #define SSL_PROTOCOL_NONE  (0)
  #define SSL_PROTOCOL_SSLV2 (1<<0)
  #define SSL_PROTOCOL_SSLV3 (1<<1)
  #define SSL_PROTOCOL_TLSV1 (1<<2)
  #define SSL_PROTOCOL_ALL   (SSL_PROTOCOL_SSLV2|SSL_PROTOCOL_SSLV3|SSL_PROTOCOL_TLSV1)
  typedef int ssl_proto_t;
  
  /**
   * Define the SSL verify levels
   */
  typedef enum {
      SSL_CVERIFY_UNSET           = UNSET,
      SSL_CVERIFY_NONE            = 0,
      SSL_CVERIFY_OPTIONAL        = 1,
      SSL_CVERIFY_REQUIRE         = 2,
      SSL_CVERIFY_OPTIONAL_NO_CA  = 3
  } ssl_verify_t;
  
  #define SSL_VERIFY_PEER_STRICT \
       (SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
  
  #ifndef X509_V_ERR_CERT_UNTRUSTED
  #define X509_V_ERR_CERT_UNTRUSTED 27
  #endif
  
  #define ssl_verify_error_is_optional(errnum) \
     ((errnum == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) \
      || (errnum == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) \
      || (errnum == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) \
      || (errnum == X509_V_ERR_CERT_UNTRUSTED) \
      || (errnum == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE))
  
  /**
   * Define the SSL pass phrase dialog types
   */
  typedef enum {
      SSL_PPTYPE_UNSET   = UNSET,
      SSL_PPTYPE_BUILTIN = 0,
      SSL_PPTYPE_FILTER  = 1,
  	SSL_PPTYPE_PIPE    = 2
  } ssl_pphrase_t;
  
  /**
   * Define the Path Checking modes
   */
  #define SSL_PCM_EXISTS     1
  #define SSL_PCM_ISREG      2
  #define SSL_PCM_ISDIR      4
  #define SSL_PCM_ISNONZERO  8
  typedef unsigned int ssl_pathcheck_t;
  
  /**
   * Define the SSL session cache modes and structures
   */
  typedef enum {
      SSL_SCMODE_UNSET = UNSET,
      SSL_SCMODE_NONE  = 0,
      SSL_SCMODE_DBM   = 1,
      SSL_SCMODE_SHMCB = 3,
      SSL_SCMODE_DC    = 4,
      SSL_SCMODE_NONE_NOT_NULL = 5
  } ssl_scmode_t;
  
  /**
   * Define the SSL mutex modes
   */
  typedef enum {
      SSL_MUTEXMODE_UNSET  = UNSET,
      SSL_MUTEXMODE_NONE   = 0,
      SSL_MUTEXMODE_USED   = 1
  } ssl_mutexmode_t;
  
  /**
   * Define the SSL enabled state
   */
  typedef enum {
      SSL_ENABLED_UNSET    = UNSET,
      SSL_ENABLED_FALSE    = 0,
      SSL_ENABLED_TRUE     = 1,
  	SSL_ENABLED_OPTIONAL = 3
  } ssl_enabled_t;
  
  /**
   * Define the SSL requirement structure
   */
  typedef struct {
      char     *cpExpr;
      ssl_expr *mpExpr;
  } ssl_require_t;
  
  /**
   * Define the SSL random number generator seeding source
   */
  typedef enum {
      SSL_RSCTX_STARTUP = 1,
      SSL_RSCTX_CONNECT = 2
  } ssl_rsctx_t;
  typedef enum {
      SSL_RSSRC_BUILTIN = 1,
      SSL_RSSRC_FILE    = 2,
      SSL_RSSRC_EXEC    = 3,
      SSL_RSSRC_EGD     = 4
  } ssl_rssrc_t;
  typedef struct {
      ssl_rsctx_t  nCtx;
      ssl_rssrc_t  nSrc;
      char        *cpPath;
      int          nBytes;
  } ssl_randseed_t;
  
  /**
   * Define the structure of an ASN.1 anything
   */
  typedef struct {
      long int       nData;
      unsigned char *cpData;
      apr_time_t     source_mtime;
  } ssl_asn1_t;
  
  /**
   * Define the mod_ssl per-module configuration structure
   * (i.e. the global configuration for each httpd process)
   */
  
  typedef enum {
      SSL_SHUTDOWN_TYPE_UNSET,
      SSL_SHUTDOWN_TYPE_STANDARD,
      SSL_SHUTDOWN_TYPE_UNCLEAN,
      SSL_SHUTDOWN_TYPE_ACCURATE
  } ssl_shutdown_type_e;
  
  typedef struct {
      SSL *ssl;
      const char *client_dn;
      X509 *client_cert;
      ssl_shutdown_type_e shutdown_type;
      const char *verify_info;
      const char *verify_error;
      int verify_depth;
      int is_proxy;
      int disabled;
      int non_ssl_request;
  
      /* Track the handshake/renegotiation state for the connection so
       * that all client-initiated renegotiations can be rejected, as a
       * partial fix for CVE-2009-3555. */
      enum { 
          RENEG_INIT = 0, /* Before initial handshake */
          RENEG_REJECT, /* After initial handshake; any client-initiated
                         * renegotiation should be rejected */
          RENEG_ALLOW, /* A server-initated renegotiation is taking
                        * place (as dictated by configuration) */
          RENEG_ABORT /* Renegotiation initiated by client, abort the
                       * connection */
      } reneg_state;
      
      server_rec *server;
  } SSLConnRec;
  
  typedef struct {
      pid_t           pid;
      apr_pool_t     *pPool;
      BOOL            bFixed;
      int             nSessionCacheMode;
      char           *szSessionCacheDataFile;
      int             nSessionCacheDataSize;
      apr_shm_t      *pSessionCacheDataMM;
      apr_rmm_t      *pSessionCacheDataRMM;
      void           *tSessionCacheDataTable;
      ssl_mutexmode_t nMutexMode;
      apr_lockmech_e  nMutexMech;
      const char     *szMutexFile;
      apr_global_mutex_t   *pMutex;
      apr_array_header_t   *aRandSeed;
      apr_hash_t     *tVHostKeys;
      void           *pTmpKeys[SSL_TMP_KEY_MAX];
      apr_hash_t     *tPublicCert;
      apr_hash_t     *tPrivateKey;
  #if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
      const char     *szCryptoDevice;
  #endif
      struct {
          void *pV1, *pV2, *pV3, *pV4, *pV5, *pV6, *pV7, *pV8, *pV9, *pV10;
      } rCtx;
  } SSLModConfigRec;
  
  /** public cert/private key */
  typedef struct {
      /** 
       * server only has 1-2 certs/keys
       * 1 RSA and/or 1 DSA
       */
      const char  *cert_files[SSL_AIDX_MAX];
      const char  *key_files[SSL_AIDX_MAX];
      X509        *certs[SSL_AIDX_MAX];
      EVP_PKEY    *keys[SSL_AIDX_MAX];
  
      /** Certificates which specify the set of CA names which should be
       * sent in the CertificateRequest message: */
      const char  *ca_name_path;
      const char  *ca_name_file;
  } modssl_pk_server_t;
  
  typedef struct {
      /** proxy can have any number of cert/key pairs */
      const char  *cert_file;
      const char  *cert_path;
      STACK_OF(X509_INFO) *certs;
  } modssl_pk_proxy_t;
  
  /** stuff related to authentication that can also be per-dir */
  typedef struct {
      /** known/trusted CAs */
      const char  *ca_cert_path;
      const char  *ca_cert_file;
  
      const char  *cipher_suite;
  
      /** for client or downstream server authentication */
      int          verify_depth;
      ssl_verify_t verify_mode;
  } modssl_auth_ctx_t;
  
  typedef struct SSLSrvConfigRec SSLSrvConfigRec;
  
  typedef struct {
      SSLSrvConfigRec *sc; /** pointer back to server config */
      SSL_CTX *ssl_ctx;
  
      /** we are one or the other */
      modssl_pk_server_t *pks;
      modssl_pk_proxy_t  *pkp;
  
      ssl_proto_t  protocol;
  
      /** config for handling encrypted keys */
      ssl_pphrase_t pphrase_dialog_type;
      const char   *pphrase_dialog_path;
  
      const char  *cert_chain;
  
      /** certificate revocation list */
      const char  *crl_path;
      const char  *crl_file;
      X509_STORE  *crl;
  
      modssl_auth_ctx_t auth;
  } modssl_ctx_t;
  
  struct SSLSrvConfigRec {
      SSLModConfigRec *mc;
      ssl_enabled_t    enabled;
      BOOL             proxy_enabled;
      const char      *vhost_id;
      int              vhost_id_len;
      int              session_cache_timeout;
      BOOL             cipher_server_pref;
      BOOL             insecure_reneg;
      modssl_ctx_t    *server;
      modssl_ctx_t    *proxy;
      ssl_enabled_t    proxy_ssl_check_peer_expire;
      ssl_enabled_t    proxy_ssl_check_peer_cn;
  #ifndef OPENSSL_NO_TLSEXT
      ssl_enabled_t    strict_sni_vhost_check;
  #endif
  };
  
  /**
   * Define the mod_ssl per-directory configuration structure
   * (i.e. the local configuration for all <Directory>
   *  and .htaccess contexts)
   */
  typedef struct {
      BOOL          bSSLRequired;
      apr_array_header_t *aRequirement;
      ssl_opt_t     nOptions;
      ssl_opt_t     nOptionsAdd;
      ssl_opt_t     nOptionsDel;
      const char   *szCipherSuite;
      ssl_verify_t  nVerifyClient;
      int           nVerifyDepth;
      const char   *szCACertificatePath;
      const char   *szCACertificateFile;
      const char   *szUserName;
      apr_size_t    nRenegBufferSize;
  } SSLDirConfigRec;
  
  /**
   *  function prototypes
   */
  
  /**  API glue structures  */
  extern module AP_MODULE_DECLARE_DATA ssl_module;
  
  /** "global" stuff */
  extern const char ssl_valid_ssl_mutex_string[];
  
  /**  configuration handling   */
  SSLModConfigRec *ssl_config_global_create(server_rec *);
  void         ssl_config_global_fix(SSLModConfigRec *);
  BOOL         ssl_config_global_isfixed(SSLModConfigRec *);
  void        *ssl_config_server_create(apr_pool_t *, server_rec *);
  void        *ssl_config_server_merge(apr_pool_t *, void *, void *);
  void        *ssl_config_perdir_create(apr_pool_t *, char *);
  void        *ssl_config_perdir_merge(apr_pool_t *, void *, void *);
  const char  *ssl_cmd_SSLMutex(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLPassPhraseDialog(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCryptoDevice(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLRandomSeed(cmd_parms *, void *, const char *, const char *, const char *);
  const char  *ssl_cmd_SSLEngine(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCipherSuite(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCertificateFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCertificateKeyFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCertificateChainFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCACertificatePath(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCACertificateFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCADNRequestPath(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCADNRequestFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCARevocationPath(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLCARevocationFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLHonorCipherOrder(cmd_parms *cmd, void *dcfg, int flag);
  const char  *ssl_cmd_SSLVerifyClient(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLVerifyDepth(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLSessionCache(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLSessionCacheTimeout(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProtocol(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLOptions(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLRequireSSL(cmd_parms *, void *);
  const char  *ssl_cmd_SSLRequire(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLUserName(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLRenegBufferSize(cmd_parms *cmd, void *dcfg, const char *arg);
  const char  *ssl_cmd_SSLStrictSNIVHostCheck(cmd_parms *cmd, void *dcfg, int flag);
  const char *ssl_cmd_SSLInsecureRenegotiation(cmd_parms *cmd, void *dcfg, int flag);
  
  const char  *ssl_cmd_SSLProxyEngine(cmd_parms *cmd, void *dcfg, int flag);
  const char  *ssl_cmd_SSLProxyProtocol(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyCipherSuite(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyVerify(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyVerifyDepth(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyCACertificatePath(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyCACertificateFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyCARevocationPath(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyCARevocationFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyMachineCertificatePath(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyMachineCertificateFile(cmd_parms *, void *, const char *);
  const char  *ssl_cmd_SSLProxyCheckPeerExpire(cmd_parms *cmd, void *dcfg, int flag);
  const char  *ssl_cmd_SSLProxyCheckPeerCN(cmd_parms *cmd, void *dcfg, int flag);
  
  /**  module initialization  */
  int          ssl_init_Module(apr_pool_t *, apr_pool_t *, apr_pool_t *, server_rec *);
  void         ssl_init_Engine(server_rec *, apr_pool_t *);
  void         ssl_init_ConfigureServer(server_rec *, apr_pool_t *, apr_pool_t *, SSLSrvConfigRec *);
  void         ssl_init_CheckServers(server_rec *, apr_pool_t *);
  STACK_OF(X509_NAME) 
              *ssl_init_FindCAList(server_rec *, apr_pool_t *, const char *, const char *);
  void         ssl_init_Child(apr_pool_t *, server_rec *);
  apr_status_t ssl_init_ModuleKill(void *data);
  
  /**  Apache API hooks  */
  int          ssl_hook_Auth(request_rec *);
  int          ssl_hook_UserCheck(request_rec *);
  int          ssl_hook_Access(request_rec *);
  int          ssl_hook_Fixup(request_rec *);
  int          ssl_hook_ReadReq(request_rec *);
  int          ssl_hook_Upgrade(request_rec *);
  void         ssl_hook_ConfigTest(apr_pool_t *pconf, server_rec *s);
  
  /**  OpenSSL callbacks */
  RSA         *ssl_callback_TmpRSA(SSL *, int, int);
  DH          *ssl_callback_TmpDH(SSL *, int, int);
  int          ssl_callback_SSLVerify(int, X509_STORE_CTX *);
  int          ssl_callback_SSLVerify_CRL(int, X509_STORE_CTX *, conn_rec *);
  int          ssl_callback_proxy_cert(SSL *ssl, MODSSL_CLIENT_CERT_CB_ARG_TYPE **x509, EVP_PKEY **pkey);
  int          ssl_callback_NewSessionCacheEntry(SSL *, SSL_SESSION *);
  SSL_SESSION *ssl_callback_GetSessionCacheEntry(SSL *, unsigned char *, int, int *);
  void         ssl_callback_DelSessionCacheEntry(SSL_CTX *, SSL_SESSION *);
  void         ssl_callback_Info(MODSSL_INFO_CB_ARG_TYPE, int, int);
  #ifndef OPENSSL_NO_TLSEXT
  int          ssl_callback_ServerNameIndication(SSL *, int *, modssl_ctx_t *);
  #endif
  
  /**  Session Cache Support  */
  void         ssl_scache_init(server_rec *, apr_pool_t *);
  void         ssl_scache_status_register(apr_pool_t *p);
  void         ssl_scache_kill(server_rec *);
  BOOL         ssl_scache_store(server_rec *, UCHAR *, int, time_t, SSL_SESSION *);
  SSL_SESSION *ssl_scache_retrieve(server_rec *, UCHAR *, int);
  void         ssl_scache_remove(server_rec *, UCHAR *, int);
  
  char        *ssl_scache_id2sz(UCHAR *, int);
  void         ssl_scache_dbm_init(server_rec *, apr_pool_t *);
  void         ssl_scache_dbm_kill(server_rec *);
  BOOL         ssl_scache_dbm_store(server_rec *, UCHAR *, int, time_t, SSL_SESSION *);
  SSL_SESSION *ssl_scache_dbm_retrieve(server_rec *, UCHAR *, int);
  void         ssl_scache_dbm_remove(server_rec *, UCHAR *, int);
  void         ssl_scache_dbm_status(request_rec *r, int flags, apr_pool_t *pool);
  
  void         ssl_scache_shmcb_init(server_rec *, apr_pool_t *);
  void         ssl_scache_shmcb_kill(server_rec *);
  BOOL         ssl_scache_shmcb_store(server_rec *, UCHAR *, int, time_t, SSL_SESSION *);
  SSL_SESSION *ssl_scache_shmcb_retrieve(server_rec *, UCHAR *, int);
  void         ssl_scache_shmcb_remove(server_rec *, UCHAR *, int);
  void         ssl_scache_shmcb_status(request_rec *r, int flags, apr_pool_t *pool);
  
  void         ssl_scache_dc_init(server_rec *, apr_pool_t *);
  void         ssl_scache_dc_kill(server_rec *);
  BOOL         ssl_scache_dc_store(server_rec *, UCHAR *, int, time_t, SSL_SESSION *);
  SSL_SESSION *ssl_scache_dc_retrieve(server_rec *, UCHAR *, int);
  void         ssl_scache_dc_remove(server_rec *, UCHAR *, int);
  void         ssl_scache_dc_status(request_rec *r, int flags, apr_pool_t *pool);
  
  /** Proxy Support */
  int ssl_proxy_enable(conn_rec *c);
  int ssl_engine_disable(conn_rec *c);
  
  /**  I/O  */
  void         ssl_io_filter_init(conn_rec *, SSL *);
  void         ssl_io_filter_register(apr_pool_t *);
  long         ssl_io_data_cb(BIO *, int, MODSSL_BIO_CB_ARG_TYPE *, int, long, long);
  
  /* ssl_io_buffer_fill fills the setaside buffering of the HTTP request
   * to allow an SSL renegotiation to take place. */
  int          ssl_io_buffer_fill(request_rec *r, apr_size_t maxlen);
  
  /*  PRNG  */
  int          ssl_rand_seed(server_rec *, apr_pool_t *, ssl_rsctx_t, char *);
  
  /**  Utility Functions  */
  char        *ssl_util_vhostid(apr_pool_t *, server_rec *);
  apr_file_t  *ssl_util_ppopen(server_rec *, apr_pool_t *, const char *,
                               const char * const *);
  void         ssl_util_ppclose(server_rec *, apr_pool_t *, apr_file_t *);
  char        *ssl_util_readfilter(server_rec *, apr_pool_t *, const char *,
                                   const char * const *);
  BOOL         ssl_util_path_check(ssl_pathcheck_t, const char *, apr_pool_t *);
  ssl_algo_t   ssl_util_algotypeof(X509 *, EVP_PKEY *); 
  char        *ssl_util_algotypestr(ssl_algo_t);
  void         ssl_util_thread_setup(apr_pool_t *);
  int          ssl_init_ssl_connection(conn_rec *c);
  
  /**  Pass Phrase Support  */
  void         ssl_pphrase_Handle(server_rec *, apr_pool_t *);
  
  /**  Diffie-Hellman Parameter Support  */
  DH           *ssl_dh_GetTmpParam(int);
  DH           *ssl_dh_GetParamFromFile(char *);
  
  unsigned char *ssl_asn1_table_set(apr_hash_t *table,
                                    const char *key,
                                    long int length);
  
  ssl_asn1_t *ssl_asn1_table_get(apr_hash_t *table,
                                 const char *key);
  
  void ssl_asn1_table_unset(apr_hash_t *table,
                            const char *key);
  
  const char *ssl_asn1_keystr(int keytype);
  
  const char *ssl_asn1_table_keyfmt(apr_pool_t *p,
                                    const char *id,
                                    int keytype);
  /**  Mutex Support  */
  int          ssl_mutex_init(server_rec *, apr_pool_t *);
  int          ssl_mutex_reinit(server_rec *, apr_pool_t *);
  int          ssl_mutex_on(server_rec *);
  int          ssl_mutex_off(server_rec *);
  
  /**  Logfile Support  */
  void         ssl_die(void);
  void         ssl_log_ssl_error(const char *, int, int, server_rec *);
  
  /**  Variables  */
  
  /* Register variables for the lifetime of the process pool 'p'. */
  void         ssl_var_register(apr_pool_t *p);
  char        *ssl_var_lookup(apr_pool_t *, server_rec *, conn_rec *, request_rec *, char *);
  const char  *ssl_ext_lookup(apr_pool_t *p, conn_rec *c, int peer, const char *oid);
  
  extern apr_array_header_t *ssl_extlist_by_oid(request_rec *r, const char *oidstr);
  
  void         ssl_var_log_config_register(apr_pool_t *p);
  
  /* Extract SSL_*_DN_* variables into table 't' from SSL object 'ssl',
   * allocating from 'p': */
  void modssl_var_extract_dns(apr_table_t *t, SSL *ssl, apr_pool_t *p);
  
  #define APR_SHM_MAXSIZE (64 * 1024 * 1024)
  
  #endif /* SSL_PRIVATE_H */
  /** @} */
  
  