with -rev close connection if client sends "CLOSE"
[openssl.git] / apps / s_server.c
index acc124538afa74c5911fbc52748b15eec405d806..b67ab4128e6b0fa67533c36147aaed06dd56c794 100644 (file)
@@ -206,12 +206,15 @@ static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength);
 #endif
 static int sv_body(char *hostname, int s, unsigned char *context);
 static int www_body(char *hostname, int s, unsigned char *context);
+static int rev_body(char *hostname, int s, unsigned char *context);
 static void close_accept_socket(void );
 static void sv_usage(void);
 static int init_ssl_connection(SSL *s);
 static void print_stats(BIO *bp,SSL_CTX *ctx);
 static int generate_session_id(const SSL *ssl, unsigned char *id,
                                unsigned int *id_len);
+static void init_session_cache_ctx(SSL_CTX *sctx);
+static void free_sessions(void);
 #ifndef OPENSSL_NO_DH
 static DH *load_dh_param(const char *dhfile);
 static DH *get_dh512(void);
@@ -262,9 +265,8 @@ static int accept_socket= -1;
 #undef PROG
 #define PROG           s_server_main
 
-extern int verify_depth, verify_return_error;
+extern int verify_depth, verify_return_error, verify_quiet;
 
-static char *cipher=NULL;
 static int s_server_verify=SSL_VERIFY_NONE;
 static int s_server_session_id_context = 1; /* anything will do */
 static const char *s_cert_file=TEST_CERT,*s_key_file=NULL, *s_chain_file=NULL;
@@ -291,8 +293,11 @@ static int s_tlsextdebug=0;
 static int s_tlsextstatus=0;
 static int cert_status_cb(SSL *s, void *arg);
 #endif
+static int no_resume_ephemeral = 0;
 static int s_msg=0;
 static int s_quiet=0;
+static int s_ign_eof=0;
+static int s_brief=0;
 
 static char *keymatexportlabel=NULL;
 static int keymatexportlen=20;
@@ -312,6 +317,8 @@ static int cert_chain = 0;
 #ifndef OPENSSL_NO_TLSEXT
 static BIO *authz_in = NULL;
 static const char *s_authz_file = NULL;
+static BIO *serverinfo_in = NULL;
+static const char *s_serverinfo_file = NULL;
 #endif
 
 #ifndef OPENSSL_NO_PSK
@@ -431,7 +438,6 @@ static int MS_CALLBACK ssl_srp_server_param_cb(SSL *s, int *ad, void *arg)
 static void s_server_init(void)
        {
        accept_socket=-1;
-       cipher=NULL;
        s_server_verify=SSL_VERIFY_NONE;
        s_dcert_file=NULL;
        s_dkey_file=NULL;
@@ -455,6 +461,7 @@ static void s_server_init(void)
        s_debug=0;
        s_msg=0;
        s_quiet=0;
+       s_brief=0;
        hack=0;
 #ifndef OPENSSL_NO_ENGINE
        engine_id=NULL;
@@ -473,6 +480,9 @@ static void sv_usage(void)
        BIO_printf(bio_err," -cert arg     - certificate file to use\n");
        BIO_printf(bio_err,"                 (default is %s)\n",TEST_CERT);
        BIO_printf(bio_err," -authz arg   -  binary authz file for certificate\n");
+#ifndef OPENSSL_NO_TLSEXT
+       BIO_printf(bio_err," -serverinfo arg - PEM serverinfo file for certificate\n");
+#endif
        BIO_printf(bio_err," -crl_check    - check the peer certificate has not been revoked by its CA.\n" \
                           "                 The CRL(s) are appended to the certificate file\n");
        BIO_printf(bio_err," -crl_check_all - check the peer certificate has not been revoked by its CA\n" \
@@ -946,9 +956,6 @@ int MAIN(int argc, char *argv[])
        char *vfyCApath=NULL,*vfyCAfile=NULL;
        unsigned char *context = NULL;
        char *dhfile = NULL;
-#ifndef OPENSSL_NO_ECDH
-       char *named_curve = NULL;
-#endif
        int badop=0;
        int ret=1;
        int build_chain = 0;
@@ -965,7 +972,8 @@ int MAIN(int argc, char *argv[])
        X509 *s_cert = NULL, *s_dcert = NULL;
        STACK_OF(X509) *s_chain = NULL, *s_dchain = NULL;
        EVP_PKEY *s_key = NULL, *s_dkey = NULL;
-       int no_cache = 0;
+       int no_cache = 0, ext_cache = 0;
+       int rev = 0;
 #ifndef OPENSSL_NO_TLSEXT
        EVP_PKEY *s_key2 = NULL;
        X509 *s_cert2 = NULL;
@@ -989,6 +997,7 @@ int MAIN(int argc, char *argv[])
 
        char *crl_file = NULL;
        int crl_format = FORMAT_PEM;
+       int crl_download = 0;
        STACK_OF(X509_CRL) *crls = NULL;
 
        meth=SSLv23_server_method();
@@ -1036,7 +1045,8 @@ int MAIN(int argc, char *argv[])
                        s_server_verify=SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE;
                        if (--argc < 1) goto bad;
                        verify_depth=atoi(*(++argv));
-                       BIO_printf(bio_err,"verify depth is %d\n",verify_depth);
+                       if (!s_quiet)
+                               BIO_printf(bio_err,"verify depth is %d\n",verify_depth);
                        }
                else if (strcmp(*argv,"-Verify") == 0)
                        {
@@ -1044,7 +1054,8 @@ int MAIN(int argc, char *argv[])
                                SSL_VERIFY_CLIENT_ONCE;
                        if (--argc < 1) goto bad;
                        verify_depth=atoi(*(++argv));
-                       BIO_printf(bio_err,"verify depth is %d, must return a certificate\n",verify_depth);
+                       if (!s_quiet)
+                               BIO_printf(bio_err,"verify depth is %d, must return a certificate\n",verify_depth);
                        }
                else if (strcmp(*argv,"-context") == 0)
                        {
@@ -1061,12 +1072,19 @@ int MAIN(int argc, char *argv[])
                        if (--argc < 1) goto bad;
                        crl_file= *(++argv);
                        }
+               else if (strcmp(*argv,"-crl_download") == 0)
+                       crl_download = 1;
 #ifndef OPENSSL_NO_TLSEXT
                else if (strcmp(*argv,"-authz") == 0)
                        {
                        if (--argc < 1) goto bad;
                        s_authz_file = *(++argv);
                        }
+               else if (strcmp(*argv,"-serverinfo") == 0)
+                       {
+                       if (--argc < 1) goto bad;
+                       s_serverinfo_file = *(++argv);
+                       }
 #endif
                else if (strcmp(*argv,"-certform") == 0)
                        {
@@ -1098,13 +1116,6 @@ int MAIN(int argc, char *argv[])
                        if (--argc < 1) goto bad;
                        dhfile = *(++argv);
                        }
-#ifndef OPENSSL_NO_ECDH                
-               else if (strcmp(*argv,"-named_curve") == 0)
-                       {
-                       if (--argc < 1) goto bad;
-                       named_curve = *(++argv);
-                       }
-#endif
                else if (strcmp(*argv,"-dcertform") == 0)
                        {
                        if (--argc < 1) goto bad;
@@ -1156,6 +1167,8 @@ int MAIN(int argc, char *argv[])
                        }
                else if (strcmp(*argv,"-no_cache") == 0)
                        no_cache = 1;
+               else if (strcmp(*argv,"-ext_cache") == 0)
+                       ext_cache = 1;
                else if (strcmp(*argv,"-CRLform") == 0)
                        {
                        if (--argc < 1) goto bad;
@@ -1181,6 +1194,8 @@ int MAIN(int argc, char *argv[])
                        }
                else if (strcmp(*argv,"-verify_return_error") == 0)
                        verify_return_error = 1;
+               else if (strcmp(*argv,"-verify_quiet") == 0)
+                       verify_quiet = 1;
                else if (strcmp(*argv,"-build_chain") == 0)
                        build_chain = 1;
                else if (strcmp(*argv,"-CAfile") == 0)
@@ -1209,6 +1224,10 @@ int MAIN(int argc, char *argv[])
 #endif
                        s_nbio_test=1;
                        }
+               else if (strcmp(*argv,"-ign_eof") == 0)
+                       s_ign_eof=1;
+               else if (strcmp(*argv,"-no_ign_eof") == 0)
+                       s_ign_eof=0;
                else if (strcmp(*argv,"-debug") == 0)
                        { s_debug=1; }
 #ifndef OPENSSL_NO_TLSEXT
@@ -1261,12 +1280,20 @@ int MAIN(int argc, char *argv[])
                        { s_crlf=1; }
                else if (strcmp(*argv,"-quiet") == 0)
                        { s_quiet=1; }
+               else if (strcmp(*argv,"-brief") == 0)
+                       {
+                       s_quiet=1;
+                       s_brief=1;
+                       verify_quiet=1;
+                       }
                else if (strcmp(*argv,"-no_tmp_rsa") == 0)
                        { no_tmp_rsa=1; }
                else if (strcmp(*argv,"-no_dhe") == 0)
                        { no_dhe=1; }
                else if (strcmp(*argv,"-no_ecdhe") == 0)
                        { no_ecdhe=1; }
+               else if (strcmp(*argv,"-no_resume_ephemeral") == 0)
+                       { no_resume_ephemeral = 1; }
 #ifndef OPENSSL_NO_PSK
                 else if (strcmp(*argv,"-psk_hint") == 0)
                        {
@@ -1302,6 +1329,8 @@ int MAIN(int argc, char *argv[])
                        meth = TLSv1_server_method();
                        }
 #endif
+               else if (strcmp(*argv,"-rev") == 0)
+                       { rev=1; }
                else if (strcmp(*argv,"-www") == 0)
                        { www=1; }
                else if (strcmp(*argv,"-WWW") == 0)
@@ -1588,7 +1617,7 @@ bad:
 
        if (bio_s_out == NULL)
                {
-               if (s_quiet && !s_debug && !s_msg)
+               if (s_quiet && !s_debug)
                        {
                        bio_s_out=BIO_new(BIO_s_null());
                        if (s_msg && !bio_s_msg)
@@ -1648,6 +1677,8 @@ bad:
        if (state) SSL_CTX_set_info_callback(ctx,apps_ssl_info_callback);
        if (no_cache)
                SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
+       else if (ext_cache)
+               init_session_cache_ctx(ctx);
        else
                SSL_CTX_sess_set_cache_size(ctx,128);
 
@@ -1676,12 +1707,13 @@ bad:
        if (vpm)
                SSL_CTX_set1_param(ctx, vpm);
 
-       ssl_ctx_add_crls(ctx, crls);
+       ssl_ctx_add_crls(ctx, crls, 0);
 
        if (!args_ssl_call(ctx, bio_err, cctx, ssl_args, no_ecdhe, no_jpake))
                goto end;
 
-       if (!ssl_load_stores(ctx, vfyCApath, vfyCAfile, chCApath, chCAfile, crls))
+       if (!ssl_load_stores(ctx, vfyCApath, vfyCAfile, chCApath, chCAfile,
+                                               crls, crl_download))
                {
                BIO_printf(bio_err, "Error loading store locations\n");
                ERR_print_errors(bio_err);
@@ -1731,6 +1763,8 @@ bad:
 
                if (no_cache)
                        SSL_CTX_set_session_cache_mode(ctx2,SSL_SESS_CACHE_OFF);
+               else if (ext_cache)
+                       init_session_cache_ctx(ctx2);
                else
                        SSL_CTX_sess_set_cache_size(ctx2,128);
 
@@ -1742,7 +1776,7 @@ bad:
                if (vpm)
                        SSL_CTX_set1_param(ctx2, vpm);
 
-               ssl_ctx_add_crls(ctx2, crls);
+               ssl_ctx_add_crls(ctx2, crls, 0);
 
                if (!args_ssl_call(ctx2, bio_err, cctx, ssl_args, no_ecdhe, no_jpake))
                        goto end;
@@ -1799,63 +1833,14 @@ bad:
                }
 #endif
 
-#ifndef OPENSSL_NO_ECDH
-       if (!no_ecdhe)
-               {
-               EC_KEY *ecdh=NULL;
-
-               if (named_curve && strcmp(named_curve, "auto"))
-                       {
-                       int nid = EC_curve_nist2nid(named_curve);
-                       if (nid == NID_undef)
-                               nid = OBJ_sn2nid(named_curve);
-                       if (nid == 0)
-                               {
-                               BIO_printf(bio_err, "unknown curve name (%s)\n", 
-                                       named_curve);
-                               goto end;
-                               }
-                       ecdh = EC_KEY_new_by_curve_name(nid);
-                       if (ecdh == NULL)
-                               {
-                               BIO_printf(bio_err, "unable to create curve (%s)\n", 
-                                       named_curve);
-                               goto end;
-                               }
-                       }
-
-               if (ecdh != NULL)
-                       {
-                       BIO_printf(bio_s_out,"Setting temp ECDH parameters\n");
-                       }
-               else if (named_curve)
-                       SSL_CTX_set_ecdh_auto(ctx, 1);
-               else
-                       {
-                       BIO_printf(bio_s_out,"Using default temp ECDH parameters\n");
-                       ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
-                       if (ecdh == NULL) 
-                               {
-                               BIO_printf(bio_err, "unable to create curve (nistp256)\n");
-                               goto end;
-                               }
-                       }
-               (void)BIO_flush(bio_s_out);
-
-               SSL_CTX_set_tmp_ecdh(ctx,ecdh);
-#ifndef OPENSSL_NO_TLSEXT
-               if (ctx2) 
-                       SSL_CTX_set_tmp_ecdh(ctx2,ecdh);
-#endif
-               EC_KEY_free(ecdh);
-               }
-#endif
-       
        if (!set_cert_key_stuff(ctx, s_cert, s_key, s_chain, build_chain))
                goto end;
 #ifndef OPENSSL_NO_TLSEXT
        if (s_authz_file != NULL && !SSL_CTX_use_authz_file(ctx, s_authz_file))
                goto end;
+       if (s_serverinfo_file != NULL
+           && !SSL_CTX_use_serverinfo_file(ctx, s_serverinfo_file))
+               goto end;
 #endif
 #ifndef OPENSSL_NO_TLSEXT
        if (ctx2 && !set_cert_key_stuff(ctx2,s_cert2,s_key2, NULL, build_chain))
@@ -1928,23 +1913,6 @@ bad:
                }
 #endif
 
-       if (cipher != NULL)
-               {
-               if(!SSL_CTX_set_cipher_list(ctx,cipher))
-                       {
-                       BIO_printf(bio_err,"error setting cipher list\n");
-                       ERR_print_errors(bio_err);
-                       goto end;
-                       }
-#ifndef OPENSSL_NO_TLSEXT
-               if (ctx2 && !SSL_CTX_set_cipher_list(ctx2,cipher))
-                       {
-                       BIO_printf(bio_err,"error setting cipher list\n");
-                       ERR_print_errors(bio_err);
-                       goto end;
-                       }
-#endif
-               }
        SSL_CTX_set_verify(ctx,s_server_verify,verify_callback);
        SSL_CTX_set_session_id_context(ctx,(void*)&s_server_session_id_context,
                sizeof s_server_session_id_context);
@@ -1998,7 +1966,9 @@ bad:
 
        BIO_printf(bio_s_out,"ACCEPT\n");
        (void)BIO_flush(bio_s_out);
-       if (www)
+       if (rev)
+               do_server(port,socket_type,&accept_socket,rev_body, context);
+       else if (www)
                do_server(port,socket_type,&accept_socket,www_body, context);
        else
                do_server(port,socket_type,&accept_socket,sv_body, context);
@@ -2026,6 +1996,7 @@ end:
                OPENSSL_free(dpass);
        if (vpm)
                X509_VERIFY_PARAM_free(vpm);
+       free_sessions();
 #ifndef OPENSSL_NO_TLSEXT
        if (tlscstatp.host)
                OPENSSL_free(tlscstatp.host);
@@ -2040,6 +2011,8 @@ end:
                EVP_PKEY_free(s_key2);
        if (authz_in != NULL)
                BIO_free(authz_in);
+       if (serverinfo_in != NULL)
+               BIO_free(serverinfo_in);
 #endif
        ssl_excert_free(exc);
        if (ssl_args)
@@ -2322,7 +2295,7 @@ static int sv_body(char *hostname, int s, unsigned char *context)
                                }
                        else
                                i=raw_read_stdin(buf,bufsize);
-                       if (!s_quiet)
+                       if (!s_quiet && !s_brief)
                                {
                                if ((i <= 0) || (buf[0] == 'Q'))
                                        {
@@ -2575,6 +2548,9 @@ static int init_ssl_connection(SSL *con)
                return(0);
                }
 
+       if (s_brief)
+               print_ssl_summary(bio_err, con);
+
        PEM_write_bio_SSL_SESSION(bio_s_out,SSL_get_session(con));
 
        peer=SSL_get_peer_certificate(con);
@@ -2593,7 +2569,10 @@ static int init_ssl_connection(SSL *con)
                BIO_printf(bio_s_out,"Shared ciphers:%s\n",buf);
        str=SSL_CIPHER_get_name(SSL_get_current_cipher(con));
        ssl_print_sigalgs(bio_s_out, con);
-       ssl_print_curves(bio_s_out, con);
+#ifndef OPENSSL_NO_EC
+       ssl_print_point_formats(bio_s_out, con);
+       ssl_print_curves(bio_s_out, con, 0);
+#endif
        BIO_printf(bio_s_out,"CIPHER is %s\n",(str != NULL)?str:"(NONE)");
 
 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
@@ -2913,7 +2892,9 @@ static int www_body(char *hostname, int s, unsigned char *context)
                                BIO_puts(io,"\n");
                                }
                        ssl_print_sigalgs(io, con);
-                       ssl_print_curves(io, con);
+#ifndef OPENSSL_NO_EC
+                       ssl_print_curves(io, con, 0);
+#endif
                        BIO_printf(io,(SSL_cache_hit(con)
                                ?"---\nReused, "
                                :"---\nNew, "));
@@ -3107,6 +3088,152 @@ err:
        return(ret);
        }
 
+static int rev_body(char *hostname, int s, unsigned char *context)
+       {
+       char *buf=NULL;
+       int i;
+       int ret=1;
+       SSL *con;
+       BIO *io,*ssl_bio,*sbio;
+#ifndef OPENSSL_NO_KRB5
+       KSSL_CTX *kctx;
+#endif
+
+       buf=OPENSSL_malloc(bufsize);
+       if (buf == NULL) return(0);
+       io=BIO_new(BIO_f_buffer());
+       ssl_bio=BIO_new(BIO_f_ssl());
+       if ((io == NULL) || (ssl_bio == NULL)) goto err;
+
+       /* lets make the output buffer a reasonable size */
+       if (!BIO_set_write_buffer_size(io,bufsize)) goto err;
+
+       if ((con=SSL_new(ctx)) == NULL) goto err;
+#ifndef OPENSSL_NO_TLSEXT
+       if (s_tlsextdebug)
+               {
+               SSL_set_tlsext_debug_callback(con, tlsext_cb);
+               SSL_set_tlsext_debug_arg(con, bio_s_out);
+               }
+#endif
+#ifndef OPENSSL_NO_KRB5
+       if ((kctx = kssl_ctx_new()) != NULL)
+               {
+               kssl_ctx_setstring(kctx, KSSL_SERVICE, KRB5SVC);
+               kssl_ctx_setstring(kctx, KSSL_KEYTAB, KRB5KEYTAB);
+               }
+#endif /* OPENSSL_NO_KRB5 */
+       if(context) SSL_set_session_id_context(con, context,
+                                              strlen((char *)context));
+
+       sbio=BIO_new_socket(s,BIO_NOCLOSE);
+       SSL_set_bio(con,sbio,sbio);
+       SSL_set_accept_state(con);
+
+       BIO_set_ssl(ssl_bio,con,BIO_CLOSE);
+       BIO_push(io,ssl_bio);
+#ifdef CHARSET_EBCDIC
+       io = BIO_push(BIO_new(BIO_f_ebcdic_filter()),io);
+#endif
+
+       if (s_debug)
+               {
+               SSL_set_debug(con, 1);
+               BIO_set_callback(SSL_get_rbio(con),bio_dump_callback);
+               BIO_set_callback_arg(SSL_get_rbio(con),(char *)bio_s_out);
+               }
+       if (s_msg)
+               {
+#ifndef OPENSSL_NO_SSL_TRACE
+               if (s_msg == 2)
+                       SSL_set_msg_callback(con, SSL_trace);
+               else
+#endif
+                       SSL_set_msg_callback(con, msg_cb);
+               SSL_set_msg_callback_arg(con, bio_s_msg ? bio_s_msg : bio_s_out);
+               }
+
+       for (;;)
+               {
+               i = BIO_do_handshake(io);
+               if (i > 0)
+                       break;
+               if (!BIO_should_retry(io))
+                       {
+                       BIO_puts(bio_err, "CONNECTION FAILURE\n");
+                       ERR_print_errors(bio_err);
+                       goto end;
+                       }
+               }
+       BIO_printf(bio_err, "CONNECTION ESTABLISHED\n");
+       print_ssl_summary(bio_err, con);
+
+       for (;;)
+               {
+               i=BIO_gets(io,buf,bufsize-1);
+               if (i < 0) /* error */
+                       {
+                       if (!BIO_should_retry(io))
+                               {
+                               if (!s_quiet)
+                                       ERR_print_errors(bio_err);
+                               goto err;
+                               }
+                       else
+                               {
+                               BIO_printf(bio_s_out,"read R BLOCK\n");
+#if defined(OPENSSL_SYS_NETWARE)
+            delay(1000);
+#elif !defined(OPENSSL_SYS_MSDOS) && !defined(__DJGPP__)
+                               sleep(1);
+#endif
+                               continue;
+                               }
+                       }
+               else if (i == 0) /* end of input */
+                       {
+                       ret=1;
+                       BIO_printf(bio_err, "CONNECTION CLOSED\n");
+                       goto end;
+                       }
+               else
+                       {
+                       char *p = buf + i - 1;
+                       while(i && (*p == '\n' || *p == '\r'))
+                               {
+                               p--;
+                               i--;
+                               }
+                       if (!s_ign_eof && i == 5 && !strncmp(buf, "CLOSE", 5))
+                               {
+                               ret = 1;
+                               BIO_printf(bio_err, "CONNECTION CLOSED\n");
+                               goto end;
+                               }
+                       BUF_reverse((unsigned char *)buf, NULL, i);
+                       buf[i] = '\n';
+                       BIO_write(io, buf, i + 1);
+                       for (;;)
+                               {
+                               i = BIO_flush(io);
+                               if (i > 0)
+                                       break;
+                               if (!BIO_should_retry(io))
+                                       goto end;
+                               }
+                       }
+               }
+end:
+       /* make sure we re-use sessions */
+       SSL_set_shutdown(con,SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
+
+err:
+
+       if (buf != NULL) OPENSSL_free(buf);
+       if (io != NULL) BIO_free_all(io);
+       return(ret);
+       }
+
 #ifndef OPENSSL_NO_RSA
 static RSA MS_CALLBACK *tmp_rsa_cb(SSL *s, int is_export, int keylength)
        {
@@ -3161,3 +3288,106 @@ static int generate_session_id(const SSL *ssl, unsigned char *id,
                return 0;
        return 1;
        }
+
+/* By default s_server uses an in-memory cache which caches SSL_SESSION
+ * structures without any serialisation. This hides some bugs which only
+ * become apparent in deployed servers. By implementing a basic external
+ * session cache some issues can be debugged using s_server.
+ */
+
+typedef struct simple_ssl_session_st
+       {
+       unsigned char *id;
+       unsigned int idlen;
+       unsigned char *der;
+       int derlen;
+       struct simple_ssl_session_st *next;
+       } simple_ssl_session;
+
+static simple_ssl_session *first = NULL;
+
+static int add_session(SSL *ssl, SSL_SESSION *session)
+       {
+       simple_ssl_session *sess;
+       unsigned char *p;
+
+       sess = OPENSSL_malloc(sizeof(simple_ssl_session));
+
+       SSL_SESSION_get_id(session, &sess->idlen);
+       sess->derlen = i2d_SSL_SESSION(session, NULL);
+
+       sess->id = BUF_memdup(SSL_SESSION_get_id(session, NULL), sess->idlen);
+
+       sess->der = OPENSSL_malloc(sess->derlen);
+       p = sess->der;
+       i2d_SSL_SESSION(session, &p);
+
+       sess->next = first;
+       first = sess;
+       BIO_printf(bio_err, "New session added to external cache\n");
+       return 0;
+       }
+
+static SSL_SESSION *get_session(SSL *ssl, unsigned char *id, int idlen,
+                                       int *do_copy)
+       {
+       simple_ssl_session *sess;
+       *do_copy = 0;
+       for (sess = first; sess; sess = sess->next)
+               {
+               if (idlen == (int)sess->idlen && !memcmp(sess->id, id, idlen))
+                       {
+                       const unsigned char *p = sess->der;
+                       BIO_printf(bio_err, "Lookup session: cache hit\n");
+                       return d2i_SSL_SESSION(NULL, &p, sess->derlen);
+                       }
+               }
+       BIO_printf(bio_err, "Lookup session: cache miss\n");
+       return NULL;
+       }
+
+static void del_session(SSL_CTX *sctx, SSL_SESSION *session)
+       {
+       simple_ssl_session *sess, *prev = NULL;
+       const unsigned char *id;
+       unsigned int idlen;
+       id = SSL_SESSION_get_id(session, &idlen);       
+       for (sess = first; sess; sess = sess->next)
+               {
+               if (idlen == sess->idlen && !memcmp(sess->id, id, idlen))
+                       {
+                       if(prev)
+                               prev->next = sess->next;
+                       else
+                               first = sess->next;
+                       OPENSSL_free(sess->id);
+                       OPENSSL_free(sess->der);
+                       OPENSSL_free(sess);
+                       return;
+                       }
+               prev = sess;
+               }
+       }
+
+static void init_session_cache_ctx(SSL_CTX *sctx)
+       {
+       SSL_CTX_set_session_cache_mode(sctx,
+                       SSL_SESS_CACHE_NO_INTERNAL|SSL_SESS_CACHE_SERVER);
+       SSL_CTX_sess_set_new_cb(sctx, add_session);
+        SSL_CTX_sess_set_get_cb(sctx, get_session);
+        SSL_CTX_sess_set_remove_cb(sctx, del_session);
+       }
+
+static void free_sessions(void)
+       {
+       simple_ssl_session *sess, *tsess;
+       for (sess = first; sess;)
+               {
+               OPENSSL_free(sess->id);
+               OPENSSL_free(sess->der);
+               tsess = sess;
+               sess = sess->next;
+               OPENSSL_free(tsess);
+               }
+       first = NULL;
+       }